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a1ab4c31 AC |
1 | /**************************************************************************** |
2 | * * | |
3 | * GNAT COMPILER COMPONENTS * | |
4 | * * | |
5 | * D E C L * | |
6 | * * | |
7 | * C Implementation File * | |
8 | * * | |
7c775aca | 9 | * Copyright (C) 1992-2016, Free Software Foundation, Inc. * |
a1ab4c31 AC |
10 | * * |
11 | * GNAT is free software; you can redistribute it and/or modify it under * | |
12 | * terms of the GNU General Public License as published by the Free Soft- * | |
13 | * ware Foundation; either version 3, or (at your option) any later ver- * | |
14 | * sion. GNAT is distributed in the hope that it will be useful, but WITH- * | |
15 | * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * | |
16 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * | |
17 | * for more details. You should have received a copy of the GNU General * | |
18 | * Public License along with GCC; see the file COPYING3. If not see * | |
19 | * <http://www.gnu.org/licenses/>. * | |
20 | * * | |
21 | * GNAT was originally developed by the GNAT team at New York University. * | |
22 | * Extensive contributions were provided by Ada Core Technologies Inc. * | |
23 | * * | |
24 | ****************************************************************************/ | |
25 | ||
26 | #include "config.h" | |
27 | #include "system.h" | |
28 | #include "coretypes.h" | |
2adfab87 | 29 | #include "target.h" |
a1ab4c31 | 30 | #include "tree.h" |
d8a2d370 | 31 | #include "stringpool.h" |
2adfab87 AM |
32 | #include "diagnostic-core.h" |
33 | #include "alias.h" | |
34 | #include "fold-const.h" | |
d8a2d370 | 35 | #include "stor-layout.h" |
f82a627c | 36 | #include "tree-inline.h" |
a1ab4c31 AC |
37 | |
38 | #include "ada.h" | |
39 | #include "types.h" | |
40 | #include "atree.h" | |
41 | #include "elists.h" | |
42 | #include "namet.h" | |
43 | #include "nlists.h" | |
44 | #include "repinfo.h" | |
45 | #include "snames.h" | |
a1ab4c31 | 46 | #include "uintp.h" |
2971780e | 47 | #include "urealp.h" |
a1ab4c31 AC |
48 | #include "fe.h" |
49 | #include "sinfo.h" | |
50 | #include "einfo.h" | |
a1ab4c31 AC |
51 | #include "ada-tree.h" |
52 | #include "gigi.h" | |
53 | ||
28dd0055 EB |
54 | /* "stdcall" and "thiscall" conventions should be processed in a specific way |
55 | on 32-bit x86/Windows only. The macros below are helpers to avoid having | |
56 | to check for a Windows specific attribute throughout this unit. */ | |
a1ab4c31 AC |
57 | |
58 | #if TARGET_DLLIMPORT_DECL_ATTRIBUTES | |
c6eecbd8 PO |
59 | #ifdef TARGET_64BIT |
60 | #define Has_Stdcall_Convention(E) \ | |
61 | (!TARGET_64BIT && Convention (E) == Convention_Stdcall) | |
28dd0055 EB |
62 | #define Has_Thiscall_Convention(E) \ |
63 | (!TARGET_64BIT && is_cplusplus_method (E)) | |
c6eecbd8 | 64 | #else |
a1ab4c31 | 65 | #define Has_Stdcall_Convention(E) (Convention (E) == Convention_Stdcall) |
28dd0055 | 66 | #define Has_Thiscall_Convention(E) (is_cplusplus_method (E)) |
c6eecbd8 | 67 | #endif |
a1ab4c31 | 68 | #else |
c6eecbd8 | 69 | #define Has_Stdcall_Convention(E) 0 |
28dd0055 | 70 | #define Has_Thiscall_Convention(E) 0 |
a1ab4c31 AC |
71 | #endif |
72 | ||
93582885 EB |
73 | #define STDCALL_PREFIX "_imp__" |
74 | ||
66194a98 OH |
75 | /* Stack realignment is necessary for functions with foreign conventions when |
76 | the ABI doesn't mandate as much as what the compiler assumes - that is, up | |
77 | to PREFERRED_STACK_BOUNDARY. | |
78 | ||
79 | Such realignment can be requested with a dedicated function type attribute | |
80 | on the targets that support it. We define FOREIGN_FORCE_REALIGN_STACK to | |
81 | characterize the situations where the attribute should be set. We rely on | |
82 | compiler configuration settings for 'main' to decide. */ | |
83 | ||
84 | #ifdef MAIN_STACK_BOUNDARY | |
85 | #define FOREIGN_FORCE_REALIGN_STACK \ | |
86 | (MAIN_STACK_BOUNDARY < PREFERRED_STACK_BOUNDARY) | |
87 | #else | |
88 | #define FOREIGN_FORCE_REALIGN_STACK 0 | |
a1ab4c31 AC |
89 | #endif |
90 | ||
91 | struct incomplete | |
92 | { | |
93 | struct incomplete *next; | |
94 | tree old_type; | |
95 | Entity_Id full_type; | |
96 | }; | |
97 | ||
98 | /* These variables are used to defer recursively expanding incomplete types | |
99 | while we are processing an array, a record or a subprogram type. */ | |
100 | static int defer_incomplete_level = 0; | |
101 | static struct incomplete *defer_incomplete_list; | |
102 | ||
7b56a91b | 103 | /* This variable is used to delay expanding From_Limited_With types until the |
a1ab4c31 AC |
104 | end of the spec. */ |
105 | static struct incomplete *defer_limited_with; | |
106 | ||
1aa67003 | 107 | typedef struct subst_pair_d { |
e3554601 NF |
108 | tree discriminant; |
109 | tree replacement; | |
110 | } subst_pair; | |
111 | ||
e3554601 | 112 | |
1aa67003 | 113 | typedef struct variant_desc_d { |
fb7fb701 NF |
114 | /* The type of the variant. */ |
115 | tree type; | |
116 | ||
117 | /* The associated field. */ | |
118 | tree field; | |
119 | ||
120 | /* The value of the qualifier. */ | |
121 | tree qual; | |
122 | ||
82ea8185 EB |
123 | /* The type of the variant after transformation. */ |
124 | tree new_type; | |
fb7fb701 NF |
125 | } variant_desc; |
126 | ||
fb7fb701 | 127 | |
a1ab4c31 | 128 | /* A hash table used to cache the result of annotate_value. */ |
d242408f | 129 | |
6c907cff | 130 | struct value_annotation_hasher : ggc_cache_ptr_hash<tree_int_map> |
d242408f TS |
131 | { |
132 | static inline hashval_t | |
133 | hash (tree_int_map *m) | |
134 | { | |
135 | return htab_hash_pointer (m->base.from); | |
136 | } | |
137 | ||
138 | static inline bool | |
139 | equal (tree_int_map *a, tree_int_map *b) | |
140 | { | |
141 | return a->base.from == b->base.from; | |
142 | } | |
143 | ||
08ec2754 RS |
144 | static int |
145 | keep_cache_entry (tree_int_map *&m) | |
d242408f | 146 | { |
08ec2754 | 147 | return ggc_marked_p (m->base.from); |
d242408f TS |
148 | } |
149 | }; | |
150 | ||
151 | static GTY ((cache)) hash_table<value_annotation_hasher> *annotate_value_cache; | |
a1ab4c31 | 152 | |
0567ae8d | 153 | static void prepend_one_attribute (struct attrib **, |
e0ef6912 | 154 | enum attrib_type, tree, tree, Node_Id); |
0567ae8d AC |
155 | static void prepend_one_attribute_pragma (struct attrib **, Node_Id); |
156 | static void prepend_attributes (struct attrib **, Entity_Id); | |
bf44701f EB |
157 | static tree elaborate_expression (Node_Id, Entity_Id, const char *, bool, bool, |
158 | bool); | |
5f2e59d4 | 159 | static bool type_has_variable_size (tree); |
bf44701f EB |
160 | static tree elaborate_expression_1 (tree, Entity_Id, const char *, bool, bool); |
161 | static tree elaborate_expression_2 (tree, Entity_Id, const char *, bool, bool, | |
da01bfee | 162 | unsigned int); |
fc7a823e | 163 | static tree elaborate_reference (tree, Entity_Id, bool, tree *); |
2cac6017 | 164 | static tree gnat_to_gnu_component_type (Entity_Id, bool, bool); |
a1ab4c31 AC |
165 | static tree gnat_to_gnu_param (Entity_Id, Mechanism_Type, Entity_Id, bool, |
166 | bool *); | |
2cac6017 | 167 | static tree gnat_to_gnu_field (Entity_Id, tree, int, bool, bool); |
cb55aefb | 168 | static bool is_from_limited_with_of_main (Entity_Id); |
4aecc2f8 | 169 | static tree change_qualified_type (tree, int); |
a1ab4c31 | 170 | static bool same_discriminant_p (Entity_Id, Entity_Id); |
d8e94f79 | 171 | static bool array_type_has_nonaliased_component (tree, Entity_Id); |
229077b0 | 172 | static bool compile_time_known_address_p (Node_Id); |
fc7a823e | 173 | static bool cannot_be_superflat (Node_Id); |
cb3d597d | 174 | static bool constructor_address_p (tree); |
fc7a823e EB |
175 | static bool allocatable_size_p (tree, bool); |
176 | static bool initial_value_needs_conversion (tree, tree); | |
44e9e3ec | 177 | static int compare_field_bitpos (const PTR, const PTR); |
9580628d | 178 | static bool components_to_record (tree, Node_Id, tree, int, bool, bool, bool, |
fd787640 | 179 | bool, bool, bool, bool, bool, tree, tree *); |
a1ab4c31 AC |
180 | static Uint annotate_value (tree); |
181 | static void annotate_rep (Entity_Id, tree); | |
95c1c4bb | 182 | static tree build_position_list (tree, bool, tree, tree, unsigned int, tree); |
9771b263 DN |
183 | static vec<subst_pair> build_subst_list (Entity_Id, Entity_Id, bool); |
184 | static vec<variant_desc> build_variant_list (tree, | |
185 | vec<subst_pair> , | |
186 | vec<variant_desc> ); | |
a1ab4c31 AC |
187 | static tree validate_size (Uint, tree, Entity_Id, enum tree_code, bool, bool); |
188 | static void set_rm_size (Uint, tree, Entity_Id); | |
a1ab4c31 | 189 | static unsigned int validate_alignment (Uint, Entity_Id, unsigned int); |
86a8ba5b | 190 | static void check_ok_for_atomic_type (tree, Entity_Id, bool); |
e3554601 | 191 | static tree create_field_decl_from (tree, tree, tree, tree, tree, |
9771b263 | 192 | vec<subst_pair> ); |
b1a785fb | 193 | static tree create_rep_part (tree, tree, tree); |
95c1c4bb | 194 | static tree get_rep_part (tree); |
9771b263 DN |
195 | static tree create_variant_part_from (tree, vec<variant_desc> , tree, |
196 | tree, vec<subst_pair> ); | |
197 | static void copy_and_substitute_in_size (tree, tree, vec<subst_pair> ); | |
2d595887 | 198 | static void associate_original_type_to_packed_array (tree, Entity_Id); |
bf44701f | 199 | static const char *get_entity_char (Entity_Id); |
1515785d OH |
200 | |
201 | /* The relevant constituents of a subprogram binding to a GCC builtin. Used | |
308e6f3a | 202 | to pass around calls performing profile compatibility checks. */ |
1515785d OH |
203 | |
204 | typedef struct { | |
205 | Entity_Id gnat_entity; /* The Ada subprogram entity. */ | |
206 | tree ada_fntype; /* The corresponding GCC type node. */ | |
207 | tree btin_fntype; /* The GCC builtin function type node. */ | |
208 | } intrin_binding_t; | |
209 | ||
210 | static bool intrin_profiles_compatible_p (intrin_binding_t *); | |
a1ab4c31 AC |
211 | \f |
212 | /* Given GNAT_ENTITY, a GNAT defining identifier node, which denotes some Ada | |
1e17ef87 EB |
213 | entity, return the equivalent GCC tree for that entity (a ..._DECL node) |
214 | and associate the ..._DECL node with the input GNAT defining identifier. | |
a1ab4c31 AC |
215 | |
216 | If GNAT_ENTITY is a variable or a constant declaration, GNU_EXPR gives its | |
1e17ef87 EB |
217 | initial value (in GCC tree form). This is optional for a variable. For |
218 | a renamed entity, GNU_EXPR gives the object being renamed. | |
a1ab4c31 AC |
219 | |
220 | DEFINITION is nonzero if this call is intended for a definition. This is | |
1e17ef87 EB |
221 | used for separate compilation where it is necessary to know whether an |
222 | external declaration or a definition must be created if the GCC equivalent | |
a1ab4c31 AC |
223 | was not created previously. The value of 1 is normally used for a nonzero |
224 | DEFINITION, but a value of 2 is used in special circumstances, defined in | |
225 | the code. */ | |
226 | ||
227 | tree | |
228 | gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, int definition) | |
229 | { | |
a8e05f92 EB |
230 | /* Contains the kind of the input GNAT node. */ |
231 | const Entity_Kind kind = Ekind (gnat_entity); | |
232 | /* True if this is a type. */ | |
233 | const bool is_type = IN (kind, Type_Kind); | |
c1a569ef EB |
234 | /* True if this is an artificial entity. */ |
235 | const bool artificial_p = !Comes_From_Source (gnat_entity); | |
86060344 EB |
236 | /* True if debug info is requested for this entity. */ |
237 | const bool debug_info_p = Needs_Debug_Info (gnat_entity); | |
238 | /* True if this entity is to be considered as imported. */ | |
239 | const bool imported_p | |
240 | = (Is_Imported (gnat_entity) && No (Address_Clause (gnat_entity))); | |
a8e05f92 EB |
241 | /* For a type, contains the equivalent GNAT node to be used in gigi. */ |
242 | Entity_Id gnat_equiv_type = Empty; | |
243 | /* Temporary used to walk the GNAT tree. */ | |
1e17ef87 | 244 | Entity_Id gnat_temp; |
1e17ef87 EB |
245 | /* Contains the GCC DECL node which is equivalent to the input GNAT node. |
246 | This node will be associated with the GNAT node by calling at the end | |
247 | of the `switch' statement. */ | |
a1ab4c31 | 248 | tree gnu_decl = NULL_TREE; |
1e17ef87 EB |
249 | /* Contains the GCC type to be used for the GCC node. */ |
250 | tree gnu_type = NULL_TREE; | |
251 | /* Contains the GCC size tree to be used for the GCC node. */ | |
252 | tree gnu_size = NULL_TREE; | |
253 | /* Contains the GCC name to be used for the GCC node. */ | |
0fb2335d | 254 | tree gnu_entity_name; |
1e17ef87 | 255 | /* True if we have already saved gnu_decl as a GNAT association. */ |
a1ab4c31 | 256 | bool saved = false; |
1e17ef87 | 257 | /* True if we incremented defer_incomplete_level. */ |
a1ab4c31 | 258 | bool this_deferred = false; |
1e17ef87 | 259 | /* True if we incremented force_global. */ |
a1ab4c31 | 260 | bool this_global = false; |
1e17ef87 | 261 | /* True if we should check to see if elaborated during processing. */ |
a1ab4c31 | 262 | bool maybe_present = false; |
1e17ef87 | 263 | /* True if we made GNU_DECL and its type here. */ |
a1ab4c31 | 264 | bool this_made_decl = false; |
a8e05f92 EB |
265 | /* Size and alignment of the GCC node, if meaningful. */ |
266 | unsigned int esize = 0, align = 0; | |
267 | /* Contains the list of attributes directly attached to the entity. */ | |
1e17ef87 | 268 | struct attrib *attr_list = NULL; |
a1ab4c31 AC |
269 | |
270 | /* Since a use of an Itype is a definition, process it as such if it | |
2ddc34ba | 271 | is not in a with'ed unit. */ |
1e17ef87 | 272 | if (!definition |
a8e05f92 | 273 | && is_type |
1e17ef87 | 274 | && Is_Itype (gnat_entity) |
a1ab4c31 AC |
275 | && !present_gnu_tree (gnat_entity) |
276 | && In_Extended_Main_Code_Unit (gnat_entity)) | |
277 | { | |
1e17ef87 EB |
278 | /* Ensure that we are in a subprogram mentioned in the Scope chain of |
279 | this entity, our current scope is global, or we encountered a task | |
280 | or entry (where we can't currently accurately check scoping). */ | |
a1ab4c31 AC |
281 | if (!current_function_decl |
282 | || DECL_ELABORATION_PROC_P (current_function_decl)) | |
283 | { | |
284 | process_type (gnat_entity); | |
285 | return get_gnu_tree (gnat_entity); | |
286 | } | |
287 | ||
288 | for (gnat_temp = Scope (gnat_entity); | |
1e17ef87 EB |
289 | Present (gnat_temp); |
290 | gnat_temp = Scope (gnat_temp)) | |
a1ab4c31 AC |
291 | { |
292 | if (Is_Type (gnat_temp)) | |
293 | gnat_temp = Underlying_Type (gnat_temp); | |
294 | ||
295 | if (Ekind (gnat_temp) == E_Subprogram_Body) | |
296 | gnat_temp | |
297 | = Corresponding_Spec (Parent (Declaration_Node (gnat_temp))); | |
298 | ||
299 | if (IN (Ekind (gnat_temp), Subprogram_Kind) | |
300 | && Present (Protected_Body_Subprogram (gnat_temp))) | |
301 | gnat_temp = Protected_Body_Subprogram (gnat_temp); | |
302 | ||
303 | if (Ekind (gnat_temp) == E_Entry | |
304 | || Ekind (gnat_temp) == E_Entry_Family | |
305 | || Ekind (gnat_temp) == E_Task_Type | |
306 | || (IN (Ekind (gnat_temp), Subprogram_Kind) | |
307 | && present_gnu_tree (gnat_temp) | |
308 | && (current_function_decl | |
309 | == gnat_to_gnu_entity (gnat_temp, NULL_TREE, 0)))) | |
310 | { | |
311 | process_type (gnat_entity); | |
312 | return get_gnu_tree (gnat_entity); | |
313 | } | |
314 | } | |
315 | ||
a8e05f92 | 316 | /* This abort means the Itype has an incorrect scope, i.e. that its |
1e17ef87 | 317 | scope does not correspond to the subprogram it is declared in. */ |
a1ab4c31 AC |
318 | gcc_unreachable (); |
319 | } | |
320 | ||
a1ab4c31 AC |
321 | /* If we've already processed this entity, return what we got last time. |
322 | If we are defining the node, we should not have already processed it. | |
1e17ef87 EB |
323 | In that case, we will abort below when we try to save a new GCC tree |
324 | for this object. We also need to handle the case of getting a dummy | |
3fd7a66f EB |
325 | type when a Full_View exists but be careful so as not to trigger its |
326 | premature elaboration. */ | |
a8e05f92 EB |
327 | if ((!definition || (is_type && imported_p)) |
328 | && present_gnu_tree (gnat_entity)) | |
a1ab4c31 AC |
329 | { |
330 | gnu_decl = get_gnu_tree (gnat_entity); | |
331 | ||
332 | if (TREE_CODE (gnu_decl) == TYPE_DECL | |
333 | && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl)) | |
334 | && IN (kind, Incomplete_Or_Private_Kind) | |
3fd7a66f EB |
335 | && Present (Full_View (gnat_entity)) |
336 | && (present_gnu_tree (Full_View (gnat_entity)) | |
337 | || No (Freeze_Node (Full_View (gnat_entity))))) | |
a1ab4c31 | 338 | { |
1e17ef87 EB |
339 | gnu_decl |
340 | = gnat_to_gnu_entity (Full_View (gnat_entity), NULL_TREE, 0); | |
a1ab4c31 AC |
341 | save_gnu_tree (gnat_entity, NULL_TREE, false); |
342 | save_gnu_tree (gnat_entity, gnu_decl, false); | |
343 | } | |
344 | ||
345 | return gnu_decl; | |
346 | } | |
347 | ||
1f1b69e5 EB |
348 | /* If this is a numeric or enumeral type, or an access type, a nonzero Esize |
349 | must be specified unless it was specified by the programmer. Exceptions | |
350 | are for access-to-protected-subprogram types and all access subtypes, as | |
351 | another GNAT type is used to lay out the GCC type for them. */ | |
a1ab4c31 AC |
352 | gcc_assert (!Unknown_Esize (gnat_entity) |
353 | || Has_Size_Clause (gnat_entity) | |
1e17ef87 EB |
354 | || (!IN (kind, Numeric_Kind) |
355 | && !IN (kind, Enumeration_Kind) | |
a1ab4c31 AC |
356 | && (!IN (kind, Access_Kind) |
357 | || kind == E_Access_Protected_Subprogram_Type | |
358 | || kind == E_Anonymous_Access_Protected_Subprogram_Type | |
1f1b69e5 EB |
359 | || kind == E_Access_Subtype |
360 | || type_annotate_only))); | |
a1ab4c31 | 361 | |
b4680ca1 | 362 | /* The RM size must be specified for all discrete and fixed-point types. */ |
a8e05f92 EB |
363 | gcc_assert (!(IN (kind, Discrete_Or_Fixed_Point_Kind) |
364 | && Unknown_RM_Size (gnat_entity))); | |
365 | ||
366 | /* If we get here, it means we have not yet done anything with this entity. | |
367 | If we are not defining it, it must be a type or an entity that is defined | |
368 | elsewhere or externally, otherwise we should have defined it already. */ | |
369 | gcc_assert (definition | |
370 | || type_annotate_only | |
371 | || is_type | |
372 | || kind == E_Discriminant | |
373 | || kind == E_Component | |
374 | || kind == E_Label | |
375 | || (kind == E_Constant && Present (Full_View (gnat_entity))) | |
376 | || Is_Public (gnat_entity)); | |
a1ab4c31 AC |
377 | |
378 | /* Get the name of the entity and set up the line number and filename of | |
e8fa3dcd PMR |
379 | the original definition for use in any decl we make. Make sure we do not |
380 | inherit another source location. */ | |
0fb2335d | 381 | gnu_entity_name = get_entity_name (gnat_entity); |
e8fa3dcd PMR |
382 | if (Sloc (gnat_entity) != No_Location |
383 | && !renaming_from_generic_instantiation_p (gnat_entity)) | |
384 | Sloc_to_locus (Sloc (gnat_entity), &input_location); | |
a1ab4c31 | 385 | |
a1ab4c31 | 386 | /* For cases when we are not defining (i.e., we are referencing from |
1e17ef87 | 387 | another compilation unit) public entities, show we are at global level |
a1ab4c31 AC |
388 | for the purpose of computing scopes. Don't do this for components or |
389 | discriminants since the relevant test is whether or not the record is | |
9083aacd | 390 | being defined. */ |
a962b0a1 | 391 | if (!definition |
a962b0a1 | 392 | && kind != E_Component |
a8e05f92 EB |
393 | && kind != E_Discriminant |
394 | && Is_Public (gnat_entity) | |
395 | && !Is_Statically_Allocated (gnat_entity)) | |
a1ab4c31 AC |
396 | force_global++, this_global = true; |
397 | ||
398 | /* Handle any attributes directly attached to the entity. */ | |
399 | if (Has_Gigi_Rep_Item (gnat_entity)) | |
0567ae8d | 400 | prepend_attributes (&attr_list, gnat_entity); |
a1ab4c31 | 401 | |
a8e05f92 EB |
402 | /* Do some common processing for types. */ |
403 | if (is_type) | |
404 | { | |
405 | /* Compute the equivalent type to be used in gigi. */ | |
406 | gnat_equiv_type = Gigi_Equivalent_Type (gnat_entity); | |
407 | ||
408 | /* Machine_Attributes on types are expected to be propagated to | |
409 | subtypes. The corresponding Gigi_Rep_Items are only attached | |
410 | to the first subtype though, so we handle the propagation here. */ | |
411 | if (Base_Type (gnat_entity) != gnat_entity | |
412 | && !Is_First_Subtype (gnat_entity) | |
413 | && Has_Gigi_Rep_Item (First_Subtype (Base_Type (gnat_entity)))) | |
0567ae8d AC |
414 | prepend_attributes (&attr_list, |
415 | First_Subtype (Base_Type (gnat_entity))); | |
a8e05f92 | 416 | |
9cbad0a3 EB |
417 | /* Compute a default value for the size of an elementary type. */ |
418 | if (Known_Esize (gnat_entity) && Is_Elementary_Type (gnat_entity)) | |
a8e05f92 EB |
419 | { |
420 | unsigned int max_esize; | |
9cbad0a3 EB |
421 | |
422 | gcc_assert (UI_Is_In_Int_Range (Esize (gnat_entity))); | |
a8e05f92 EB |
423 | esize = UI_To_Int (Esize (gnat_entity)); |
424 | ||
425 | if (IN (kind, Float_Kind)) | |
426 | max_esize = fp_prec_to_size (LONG_DOUBLE_TYPE_SIZE); | |
427 | else if (IN (kind, Access_Kind)) | |
428 | max_esize = POINTER_SIZE * 2; | |
429 | else | |
430 | max_esize = LONG_LONG_TYPE_SIZE; | |
431 | ||
feec4372 EB |
432 | if (esize > max_esize) |
433 | esize = max_esize; | |
a8e05f92 | 434 | } |
a8e05f92 | 435 | } |
a1ab4c31 AC |
436 | |
437 | switch (kind) | |
438 | { | |
a1ab4c31 | 439 | case E_Component: |
59f5c969 | 440 | case E_Discriminant: |
a1ab4c31 | 441 | { |
2ddc34ba | 442 | /* The GNAT record where the component was defined. */ |
a1ab4c31 AC |
443 | Entity_Id gnat_record = Underlying_Type (Scope (gnat_entity)); |
444 | ||
f10ff6cc AC |
445 | /* If the entity is a discriminant of an extended tagged type used to |
446 | rename a discriminant of the parent type, return the latter. */ | |
447 | if (Is_Tagged_Type (gnat_record) | |
448 | && Present (Corresponding_Discriminant (gnat_entity))) | |
a1ab4c31 AC |
449 | { |
450 | gnu_decl | |
f10ff6cc | 451 | = gnat_to_gnu_entity (Corresponding_Discriminant (gnat_entity), |
a1ab4c31 AC |
452 | gnu_expr, definition); |
453 | saved = true; | |
454 | break; | |
455 | } | |
456 | ||
f10ff6cc AC |
457 | /* If the entity is an inherited component (in the case of extended |
458 | tagged record types), just return the original entity, which must | |
459 | be a FIELD_DECL. Likewise for discriminants. If the entity is a | |
460 | non-girder discriminant (in the case of derived untagged record | |
461 | types), return the stored discriminant it renames. */ | |
462 | else if (Present (Original_Record_Component (gnat_entity)) | |
463 | && Original_Record_Component (gnat_entity) != gnat_entity) | |
a1ab4c31 | 464 | { |
a1ab4c31 | 465 | gnu_decl |
f10ff6cc | 466 | = gnat_to_gnu_entity (Original_Record_Component (gnat_entity), |
a1ab4c31 AC |
467 | gnu_expr, definition); |
468 | saved = true; | |
469 | break; | |
470 | } | |
471 | ||
a1ab4c31 AC |
472 | /* Otherwise, if we are not defining this and we have no GCC type |
473 | for the containing record, make one for it. Then we should | |
474 | have made our own equivalent. */ | |
475 | else if (!definition && !present_gnu_tree (gnat_record)) | |
476 | { | |
477 | /* ??? If this is in a record whose scope is a protected | |
478 | type and we have an Original_Record_Component, use it. | |
479 | This is a workaround for major problems in protected type | |
480 | handling. */ | |
481 | Entity_Id Scop = Scope (Scope (gnat_entity)); | |
43a4dd82 | 482 | if (Is_Protected_Type (Underlying_Type (Scop)) |
a1ab4c31 AC |
483 | && Present (Original_Record_Component (gnat_entity))) |
484 | { | |
485 | gnu_decl | |
486 | = gnat_to_gnu_entity (Original_Record_Component | |
487 | (gnat_entity), | |
488 | gnu_expr, 0); | |
489 | saved = true; | |
490 | break; | |
491 | } | |
492 | ||
493 | gnat_to_gnu_entity (Scope (gnat_entity), NULL_TREE, 0); | |
494 | gnu_decl = get_gnu_tree (gnat_entity); | |
495 | saved = true; | |
496 | break; | |
497 | } | |
498 | ||
499 | else | |
500 | /* Here we have no GCC type and this is a reference rather than a | |
2ddc34ba | 501 | definition. This should never happen. Most likely the cause is |
59f5c969 | 502 | reference before declaration in the GNAT tree for gnat_entity. */ |
a1ab4c31 AC |
503 | gcc_unreachable (); |
504 | } | |
505 | ||
5277688b EB |
506 | case E_Constant: |
507 | /* Ignore constant definitions already marked with the error node. See | |
508 | the N_Object_Declaration case of gnat_to_gnu for the rationale. */ | |
509 | if (definition | |
5277688b EB |
510 | && present_gnu_tree (gnat_entity) |
511 | && get_gnu_tree (gnat_entity) == error_mark_node) | |
512 | { | |
513 | maybe_present = true; | |
514 | break; | |
515 | } | |
516 | ||
517 | /* Ignore deferred constant definitions without address clause since | |
518 | they are processed fully in the front-end. If No_Initialization | |
519 | is set, this is not a deferred constant but a constant whose value | |
520 | is built manually. And constants that are renamings are handled | |
521 | like variables. */ | |
522 | if (definition | |
523 | && !gnu_expr | |
524 | && No (Address_Clause (gnat_entity)) | |
525 | && !No_Initialization (Declaration_Node (gnat_entity)) | |
526 | && No (Renamed_Object (gnat_entity))) | |
527 | { | |
528 | gnu_decl = error_mark_node; | |
529 | saved = true; | |
530 | break; | |
531 | } | |
532 | ||
533 | /* If this is a use of a deferred constant without address clause, | |
534 | get its full definition. */ | |
535 | if (!definition | |
536 | && No (Address_Clause (gnat_entity)) | |
537 | && Present (Full_View (gnat_entity))) | |
538 | { | |
539 | gnu_decl | |
540 | = gnat_to_gnu_entity (Full_View (gnat_entity), gnu_expr, 0); | |
541 | saved = true; | |
542 | break; | |
543 | } | |
544 | ||
241125b2 EB |
545 | /* If we have a constant that we are not defining, get the expression it |
546 | was defined to represent. This is necessary to avoid generating dumb | |
547 | elaboration code in simple cases, but we may throw it away later if it | |
548 | is not a constant. But do not retrieve it if it is an allocator since | |
549 | the designated type might still be dummy at this point. */ | |
5277688b EB |
550 | if (!definition |
551 | && !No_Initialization (Declaration_Node (gnat_entity)) | |
552 | && Present (Expression (Declaration_Node (gnat_entity))) | |
553 | && Nkind (Expression (Declaration_Node (gnat_entity))) | |
554 | != N_Allocator) | |
5277688b | 555 | /* The expression may contain N_Expression_With_Actions nodes and |
93e708f9 EB |
556 | thus object declarations from other units. Discard them. */ |
557 | gnu_expr | |
558 | = gnat_to_gnu_external (Expression (Declaration_Node (gnat_entity))); | |
5277688b EB |
559 | |
560 | /* ... fall through ... */ | |
561 | ||
562 | case E_Exception: | |
a1ab4c31 AC |
563 | case E_Loop_Parameter: |
564 | case E_Out_Parameter: | |
565 | case E_Variable: | |
a1ab4c31 | 566 | { |
ae56e442 TG |
567 | /* Always create a variable for volatile objects and variables seen |
568 | constant but with a Linker_Section pragma. */ | |
a1ab4c31 AC |
569 | bool const_flag |
570 | = ((kind == E_Constant || kind == E_Variable) | |
571 | && Is_True_Constant (gnat_entity) | |
ae56e442 TG |
572 | && !(kind == E_Variable |
573 | && Present (Linker_Section_Pragma (gnat_entity))) | |
22868cbf | 574 | && !Treat_As_Volatile (gnat_entity) |
a1ab4c31 AC |
575 | && (((Nkind (Declaration_Node (gnat_entity)) |
576 | == N_Object_Declaration) | |
577 | && Present (Expression (Declaration_Node (gnat_entity)))) | |
901ad63f | 578 | || Present (Renamed_Object (gnat_entity)) |
c679a915 | 579 | || imported_p)); |
a1ab4c31 | 580 | bool inner_const_flag = const_flag; |
2056c5ed EB |
581 | bool static_flag = Is_Statically_Allocated (gnat_entity); |
582 | /* We implement RM 13.3(19) for exported and imported (non-constant) | |
583 | objects by making them volatile. */ | |
584 | bool volatile_flag | |
585 | = (Treat_As_Volatile (gnat_entity) | |
586 | || (!const_flag && (Is_Exported (gnat_entity) || imported_p))); | |
a1ab4c31 | 587 | bool mutable_p = false; |
86060344 | 588 | bool used_by_ref = false; |
a1ab4c31 AC |
589 | tree gnu_ext_name = NULL_TREE; |
590 | tree renamed_obj = NULL_TREE; | |
591 | tree gnu_object_size; | |
592 | ||
93e708f9 EB |
593 | /* We need to translate the renamed object even though we are only |
594 | referencing the renaming. But it may contain a call for which | |
595 | we'll generate a temporary to hold the return value and which | |
596 | is part of the definition of the renaming, so discard it. */ | |
a1ab4c31 AC |
597 | if (Present (Renamed_Object (gnat_entity)) && !definition) |
598 | { | |
599 | if (kind == E_Exception) | |
600 | gnu_expr = gnat_to_gnu_entity (Renamed_Entity (gnat_entity), | |
601 | NULL_TREE, 0); | |
602 | else | |
93e708f9 | 603 | gnu_expr = gnat_to_gnu_external (Renamed_Object (gnat_entity)); |
a1ab4c31 AC |
604 | } |
605 | ||
606 | /* Get the type after elaborating the renamed object. */ | |
607 | gnu_type = gnat_to_gnu_type (Etype (gnat_entity)); | |
608 | ||
871fda0a EB |
609 | /* If this is a standard exception definition, then use the standard |
610 | exception type. This is necessary to make sure that imported and | |
611 | exported views of exceptions are properly merged in LTO mode. */ | |
612 | if (TREE_CODE (TYPE_NAME (gnu_type)) == TYPE_DECL | |
613 | && DECL_NAME (TYPE_NAME (gnu_type)) == exception_data_name_id) | |
614 | gnu_type = except_type_node; | |
615 | ||
56345d11 | 616 | /* For a debug renaming declaration, build a debug-only entity. */ |
a1ab4c31 AC |
617 | if (Present (Debug_Renaming_Link (gnat_entity))) |
618 | { | |
56345d11 EB |
619 | /* Force a non-null value to make sure the symbol is retained. */ |
620 | tree value = build1 (INDIRECT_REF, gnu_type, | |
621 | build1 (NOP_EXPR, | |
622 | build_pointer_type (gnu_type), | |
623 | integer_minus_one_node)); | |
c172df28 AH |
624 | gnu_decl = build_decl (input_location, |
625 | VAR_DECL, gnu_entity_name, gnu_type); | |
56345d11 EB |
626 | SET_DECL_VALUE_EXPR (gnu_decl, value); |
627 | DECL_HAS_VALUE_EXPR_P (gnu_decl) = 1; | |
a1ab4c31 AC |
628 | gnat_pushdecl (gnu_decl, gnat_entity); |
629 | break; | |
630 | } | |
631 | ||
632 | /* If this is a loop variable, its type should be the base type. | |
633 | This is because the code for processing a loop determines whether | |
634 | a normal loop end test can be done by comparing the bounds of the | |
635 | loop against those of the base type, which is presumed to be the | |
636 | size used for computation. But this is not correct when the size | |
637 | of the subtype is smaller than the type. */ | |
638 | if (kind == E_Loop_Parameter) | |
639 | gnu_type = get_base_type (gnu_type); | |
640 | ||
86060344 EB |
641 | /* Reject non-renamed objects whose type is an unconstrained array or |
642 | any object whose type is a dummy type or void. */ | |
a1ab4c31 AC |
643 | if ((TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE |
644 | && No (Renamed_Object (gnat_entity))) | |
645 | || TYPE_IS_DUMMY_P (gnu_type) | |
646 | || TREE_CODE (gnu_type) == VOID_TYPE) | |
647 | { | |
648 | gcc_assert (type_annotate_only); | |
649 | if (this_global) | |
650 | force_global--; | |
651 | return error_mark_node; | |
652 | } | |
653 | ||
aae8570a EB |
654 | /* If an alignment is specified, use it if valid. Note that exceptions |
655 | are objects but don't have an alignment. We must do this before we | |
656 | validate the size, since the alignment can affect the size. */ | |
a1ab4c31 AC |
657 | if (kind != E_Exception && Known_Alignment (gnat_entity)) |
658 | { | |
659 | gcc_assert (Present (Alignment (gnat_entity))); | |
4184ef1b | 660 | |
a1ab4c31 AC |
661 | align = validate_alignment (Alignment (gnat_entity), gnat_entity, |
662 | TYPE_ALIGN (gnu_type)); | |
86060344 | 663 | |
aae8570a EB |
664 | /* No point in changing the type if there is an address clause |
665 | as the final type of the object will be a reference type. */ | |
666 | if (Present (Address_Clause (gnat_entity))) | |
667 | align = 0; | |
668 | else | |
4184ef1b EB |
669 | { |
670 | tree orig_type = gnu_type; | |
671 | ||
672 | gnu_type | |
673 | = maybe_pad_type (gnu_type, NULL_TREE, align, gnat_entity, | |
674 | false, false, definition, true); | |
675 | ||
676 | /* If a padding record was made, declare it now since it will | |
677 | never be declared otherwise. This is necessary to ensure | |
678 | that its subtrees are properly marked. */ | |
679 | if (gnu_type != orig_type && !DECL_P (TYPE_NAME (gnu_type))) | |
74746d49 | 680 | create_type_decl (TYPE_NAME (gnu_type), gnu_type, true, |
4184ef1b EB |
681 | debug_info_p, gnat_entity); |
682 | } | |
a1ab4c31 AC |
683 | } |
684 | ||
86060344 EB |
685 | /* If we are defining the object, see if it has a Size and validate it |
686 | if so. If we are not defining the object and a Size clause applies, | |
687 | simply retrieve the value. We don't want to ignore the clause and | |
688 | it is expected to have been validated already. Then get the new | |
689 | type, if any. */ | |
a1ab4c31 AC |
690 | if (definition) |
691 | gnu_size = validate_size (Esize (gnat_entity), gnu_type, | |
692 | gnat_entity, VAR_DECL, false, | |
693 | Has_Size_Clause (gnat_entity)); | |
694 | else if (Has_Size_Clause (gnat_entity)) | |
695 | gnu_size = UI_To_gnu (Esize (gnat_entity), bitsizetype); | |
696 | ||
697 | if (gnu_size) | |
698 | { | |
699 | gnu_type | |
700 | = make_type_from_size (gnu_type, gnu_size, | |
701 | Has_Biased_Representation (gnat_entity)); | |
702 | ||
703 | if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0)) | |
704 | gnu_size = NULL_TREE; | |
705 | } | |
706 | ||
707 | /* If this object has self-referential size, it must be a record with | |
86060344 EB |
708 | a default discriminant. We are supposed to allocate an object of |
709 | the maximum size in this case, unless it is a constant with an | |
a1ab4c31 AC |
710 | initializing expression, in which case we can get the size from |
711 | that. Note that the resulting size may still be a variable, so | |
712 | this may end up with an indirect allocation. */ | |
713 | if (No (Renamed_Object (gnat_entity)) | |
714 | && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))) | |
715 | { | |
716 | if (gnu_expr && kind == E_Constant) | |
717 | { | |
718 | tree size = TYPE_SIZE (TREE_TYPE (gnu_expr)); | |
719 | if (CONTAINS_PLACEHOLDER_P (size)) | |
720 | { | |
721 | /* If the initializing expression is itself a constant, | |
722 | despite having a nominal type with self-referential | |
723 | size, we can get the size directly from it. */ | |
724 | if (TREE_CODE (gnu_expr) == COMPONENT_REF | |
a1ab4c31 AC |
725 | && TYPE_IS_PADDING_P |
726 | (TREE_TYPE (TREE_OPERAND (gnu_expr, 0))) | |
727 | && TREE_CODE (TREE_OPERAND (gnu_expr, 0)) == VAR_DECL | |
728 | && (TREE_READONLY (TREE_OPERAND (gnu_expr, 0)) | |
729 | || DECL_READONLY_ONCE_ELAB | |
730 | (TREE_OPERAND (gnu_expr, 0)))) | |
731 | gnu_size = DECL_SIZE (TREE_OPERAND (gnu_expr, 0)); | |
732 | else | |
733 | gnu_size | |
734 | = SUBSTITUTE_PLACEHOLDER_IN_EXPR (size, gnu_expr); | |
735 | } | |
736 | else | |
737 | gnu_size = size; | |
738 | } | |
739 | /* We may have no GNU_EXPR because No_Initialization is | |
740 | set even though there's an Expression. */ | |
741 | else if (kind == E_Constant | |
742 | && (Nkind (Declaration_Node (gnat_entity)) | |
743 | == N_Object_Declaration) | |
744 | && Present (Expression (Declaration_Node (gnat_entity)))) | |
745 | gnu_size | |
746 | = TYPE_SIZE (gnat_to_gnu_type | |
747 | (Etype | |
748 | (Expression (Declaration_Node (gnat_entity))))); | |
749 | else | |
750 | { | |
751 | gnu_size = max_size (TYPE_SIZE (gnu_type), true); | |
752 | mutable_p = true; | |
753 | } | |
1d5bfe97 EB |
754 | |
755 | /* If we are at global level and the size isn't constant, call | |
756 | elaborate_expression_1 to make a variable for it rather than | |
757 | calculating it each time. */ | |
758 | if (global_bindings_p () && !TREE_CONSTANT (gnu_size)) | |
759 | gnu_size = elaborate_expression_1 (gnu_size, gnat_entity, | |
bf44701f | 760 | "SIZE", definition, false); |
a1ab4c31 AC |
761 | } |
762 | ||
86060344 EB |
763 | /* If the size is zero byte, make it one byte since some linkers have |
764 | troubles with zero-sized objects. If the object will have a | |
a1ab4c31 AC |
765 | template, that will make it nonzero so don't bother. Also avoid |
766 | doing that for an object renaming or an object with an address | |
767 | clause, as we would lose useful information on the view size | |
768 | (e.g. for null array slices) and we are not allocating the object | |
769 | here anyway. */ | |
770 | if (((gnu_size | |
771 | && integer_zerop (gnu_size) | |
772 | && !TREE_OVERFLOW (gnu_size)) | |
773 | || (TYPE_SIZE (gnu_type) | |
774 | && integer_zerop (TYPE_SIZE (gnu_type)) | |
775 | && !TREE_OVERFLOW (TYPE_SIZE (gnu_type)))) | |
fd6e497e | 776 | && !Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity)) |
a8e05f92 EB |
777 | && No (Renamed_Object (gnat_entity)) |
778 | && No (Address_Clause (gnat_entity))) | |
a1ab4c31 AC |
779 | gnu_size = bitsize_unit_node; |
780 | ||
781 | /* If this is an object with no specified size and alignment, and | |
782 | if either it is atomic or we are not optimizing alignment for | |
783 | space and it is composite and not an exception, an Out parameter | |
784 | or a reference to another object, and the size of its type is a | |
785 | constant, set the alignment to the smallest one which is not | |
786 | smaller than the size, with an appropriate cap. */ | |
787 | if (!gnu_size && align == 0 | |
f797c2b7 | 788 | && (Is_Atomic_Or_VFA (gnat_entity) |
a1ab4c31 AC |
789 | || (!Optimize_Alignment_Space (gnat_entity) |
790 | && kind != E_Exception | |
791 | && kind != E_Out_Parameter | |
792 | && Is_Composite_Type (Etype (gnat_entity)) | |
793 | && !Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity)) | |
c679a915 | 794 | && !Is_Exported (gnat_entity) |
a1ab4c31 AC |
795 | && !imported_p |
796 | && No (Renamed_Object (gnat_entity)) | |
797 | && No (Address_Clause (gnat_entity)))) | |
798 | && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST) | |
799 | { | |
dea976c4 EB |
800 | unsigned int size_cap, align_cap; |
801 | ||
802 | /* No point in promoting the alignment if this doesn't prevent | |
803 | BLKmode access to the object, in particular block copy, as | |
804 | this will for example disable the NRV optimization for it. | |
805 | No point in jumping through all the hoops needed in order | |
bb3da4f2 EB |
806 | to support BIGGEST_ALIGNMENT if we don't really have to. |
807 | So we cap to the smallest alignment that corresponds to | |
808 | a known efficient memory access pattern of the target. */ | |
f797c2b7 | 809 | if (Is_Atomic_Or_VFA (gnat_entity)) |
dea976c4 EB |
810 | { |
811 | size_cap = UINT_MAX; | |
812 | align_cap = BIGGEST_ALIGNMENT; | |
813 | } | |
814 | else | |
815 | { | |
816 | size_cap = MAX_FIXED_MODE_SIZE; | |
817 | align_cap = get_mode_alignment (ptr_mode); | |
818 | } | |
a1ab4c31 | 819 | |
cc269bb6 | 820 | if (!tree_fits_uhwi_p (TYPE_SIZE (gnu_type)) |
dea976c4 EB |
821 | || compare_tree_int (TYPE_SIZE (gnu_type), size_cap) > 0) |
822 | align = 0; | |
823 | else if (compare_tree_int (TYPE_SIZE (gnu_type), align_cap) > 0) | |
a1ab4c31 AC |
824 | align = align_cap; |
825 | else | |
ae7e9ddd | 826 | align = ceil_pow2 (tree_to_uhwi (TYPE_SIZE (gnu_type))); |
a1ab4c31 AC |
827 | |
828 | /* But make sure not to under-align the object. */ | |
829 | if (align <= TYPE_ALIGN (gnu_type)) | |
830 | align = 0; | |
831 | ||
832 | /* And honor the minimum valid atomic alignment, if any. */ | |
833 | #ifdef MINIMUM_ATOMIC_ALIGNMENT | |
834 | else if (align < MINIMUM_ATOMIC_ALIGNMENT) | |
835 | align = MINIMUM_ATOMIC_ALIGNMENT; | |
836 | #endif | |
837 | } | |
838 | ||
839 | /* If the object is set to have atomic components, find the component | |
840 | type and validate it. | |
841 | ||
842 | ??? Note that we ignore Has_Volatile_Components on objects; it's | |
2ddc34ba | 843 | not at all clear what to do in that case. */ |
a1ab4c31 AC |
844 | if (Has_Atomic_Components (gnat_entity)) |
845 | { | |
846 | tree gnu_inner = (TREE_CODE (gnu_type) == ARRAY_TYPE | |
847 | ? TREE_TYPE (gnu_type) : gnu_type); | |
848 | ||
849 | while (TREE_CODE (gnu_inner) == ARRAY_TYPE | |
850 | && TYPE_MULTI_ARRAY_P (gnu_inner)) | |
851 | gnu_inner = TREE_TYPE (gnu_inner); | |
852 | ||
86a8ba5b | 853 | check_ok_for_atomic_type (gnu_inner, gnat_entity, true); |
a1ab4c31 AC |
854 | } |
855 | ||
73a1a803 EB |
856 | /* If this is an aliased object with an unconstrained array nominal |
857 | subtype, make a type that includes the template. We will either | |
858 | allocate or create a variable of that type, see below. */ | |
a1ab4c31 | 859 | if (Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity)) |
43a4dd82 | 860 | && Is_Array_Type (Underlying_Type (Etype (gnat_entity))) |
a1ab4c31 | 861 | && !type_annotate_only) |
4184ef1b | 862 | { |
6b318bf2 EB |
863 | tree gnu_array |
864 | = gnat_to_gnu_type (Base_Type (Etype (gnat_entity))); | |
4184ef1b | 865 | gnu_type |
6b318bf2 EB |
866 | = build_unc_object_type_from_ptr (TREE_TYPE (gnu_array), |
867 | gnu_type, | |
4184ef1b EB |
868 | concat_name (gnu_entity_name, |
869 | "UNC"), | |
870 | debug_info_p); | |
871 | } | |
a1ab4c31 | 872 | |
b42ff0a5 EB |
873 | /* ??? If this is an object of CW type initialized to a value, try to |
874 | ensure that the object is sufficient aligned for this value, but | |
875 | without pessimizing the allocation. This is a kludge necessary | |
876 | because we don't support dynamic alignment. */ | |
877 | if (align == 0 | |
878 | && Ekind (Etype (gnat_entity)) == E_Class_Wide_Subtype | |
879 | && No (Renamed_Object (gnat_entity)) | |
880 | && No (Address_Clause (gnat_entity))) | |
881 | align = get_target_system_allocator_alignment () * BITS_PER_UNIT; | |
882 | ||
a1ab4c31 AC |
883 | #ifdef MINIMUM_ATOMIC_ALIGNMENT |
884 | /* If the size is a constant and no alignment is specified, force | |
885 | the alignment to be the minimum valid atomic alignment. The | |
886 | restriction on constant size avoids problems with variable-size | |
887 | temporaries; if the size is variable, there's no issue with | |
888 | atomic access. Also don't do this for a constant, since it isn't | |
889 | necessary and can interfere with constant replacement. Finally, | |
890 | do not do it for Out parameters since that creates an | |
891 | size inconsistency with In parameters. */ | |
b42ff0a5 EB |
892 | if (align == 0 |
893 | && MINIMUM_ATOMIC_ALIGNMENT > TYPE_ALIGN (gnu_type) | |
a1ab4c31 AC |
894 | && !FLOAT_TYPE_P (gnu_type) |
895 | && !const_flag && No (Renamed_Object (gnat_entity)) | |
896 | && !imported_p && No (Address_Clause (gnat_entity)) | |
897 | && kind != E_Out_Parameter | |
898 | && (gnu_size ? TREE_CODE (gnu_size) == INTEGER_CST | |
899 | : TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST)) | |
900 | align = MINIMUM_ATOMIC_ALIGNMENT; | |
901 | #endif | |
902 | ||
903 | /* Make a new type with the desired size and alignment, if needed. | |
904 | But do not take into account alignment promotions to compute the | |
905 | size of the object. */ | |
906 | gnu_object_size = gnu_size ? gnu_size : TYPE_SIZE (gnu_type); | |
907 | if (gnu_size || align > 0) | |
51c7954d EB |
908 | { |
909 | tree orig_type = gnu_type; | |
910 | ||
911 | gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity, | |
842d4ee2 | 912 | false, false, definition, true); |
51c7954d EB |
913 | |
914 | /* If a padding record was made, declare it now since it will | |
915 | never be declared otherwise. This is necessary to ensure | |
916 | that its subtrees are properly marked. */ | |
917 | if (gnu_type != orig_type && !DECL_P (TYPE_NAME (gnu_type))) | |
74746d49 | 918 | create_type_decl (TYPE_NAME (gnu_type), gnu_type, true, |
51c7954d EB |
919 | debug_info_p, gnat_entity); |
920 | } | |
a1ab4c31 | 921 | |
e590690e EB |
922 | /* Now check if the type of the object allows atomic access. */ |
923 | if (Is_Atomic_Or_VFA (gnat_entity)) | |
924 | check_ok_for_atomic_type (gnu_type, gnat_entity, false); | |
925 | ||
a1ab4c31 | 926 | /* If this is a renaming, avoid as much as possible to create a new |
7194767c EB |
927 | object. However, in some cases, creating it is required because |
928 | renaming can be applied to objects that are not names in Ada. | |
929 | This processing needs to be applied to the raw expression so as | |
930 | to make it more likely to rename the underlying object. */ | |
a1ab4c31 AC |
931 | if (Present (Renamed_Object (gnat_entity))) |
932 | { | |
fc7a823e EB |
933 | /* If the renamed object had padding, strip off the reference to |
934 | the inner object and reset our type. */ | |
a1ab4c31 | 935 | if ((TREE_CODE (gnu_expr) == COMPONENT_REF |
a1ab4c31 AC |
936 | && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))) |
937 | /* Strip useless conversions around the object. */ | |
71196d4e | 938 | || gnat_useless_type_conversion (gnu_expr)) |
a1ab4c31 AC |
939 | { |
940 | gnu_expr = TREE_OPERAND (gnu_expr, 0); | |
941 | gnu_type = TREE_TYPE (gnu_expr); | |
942 | } | |
943 | ||
9422c886 EB |
944 | /* Or else, if the renamed object has an unconstrained type with |
945 | default discriminant, use the padded type. */ | |
fc7a823e | 946 | else if (type_is_padding_self_referential (TREE_TYPE (gnu_expr))) |
9422c886 EB |
947 | gnu_type = TREE_TYPE (gnu_expr); |
948 | ||
7194767c EB |
949 | /* Case 1: if this is a constant renaming stemming from a function |
950 | call, treat it as a normal object whose initial value is what | |
951 | is being renamed. RM 3.3 says that the result of evaluating a | |
952 | function call is a constant object. Therefore, it can be the | |
953 | inner object of a constant renaming and the renaming must be | |
954 | fully instantiated, i.e. it cannot be a reference to (part of) | |
482a338d EB |
955 | an existing object. And treat other rvalues (addresses, null |
956 | expressions, constructors and literals) the same way. */ | |
7194767c EB |
957 | tree inner = gnu_expr; |
958 | while (handled_component_p (inner) || CONVERT_EXPR_P (inner)) | |
959 | inner = TREE_OPERAND (inner, 0); | |
960 | /* Expand_Dispatching_Call can prepend a comparison of the tags | |
961 | before the call to "=". */ | |
93e708f9 EB |
962 | if (TREE_CODE (inner) == TRUTH_ANDIF_EXPR |
963 | || TREE_CODE (inner) == COMPOUND_EXPR) | |
7194767c | 964 | inner = TREE_OPERAND (inner, 1); |
241125b2 EB |
965 | if ((TREE_CODE (inner) == CALL_EXPR |
966 | && !call_is_atomic_load (inner)) | |
482a338d | 967 | || TREE_CODE (inner) == ADDR_EXPR |
241125b2 EB |
968 | || TREE_CODE (inner) == NULL_EXPR |
969 | || TREE_CODE (inner) == CONSTRUCTOR | |
93e708f9 EB |
970 | || CONSTANT_CLASS_P (inner) |
971 | /* We need to detect the case where a temporary is created to | |
972 | hold the return value, since we cannot safely rename it at | |
973 | top level as it lives only in the elaboration routine. */ | |
974 | || (TREE_CODE (inner) == VAR_DECL | |
975 | && DECL_RETURN_VALUE_P (inner)) | |
976 | /* We also need to detect the case where the front-end creates | |
977 | a dangling 'reference to a function call at top level and | |
978 | substitutes it in the renaming, for example: | |
979 | ||
980 | q__b : boolean renames r__f.e (1); | |
981 | ||
982 | can be rewritten into: | |
983 | ||
984 | q__R1s : constant q__A2s := r__f'reference; | |
985 | [...] | |
986 | q__b : boolean renames q__R1s.all.e (1); | |
987 | ||
988 | We cannot safely rename the rewritten expression since the | |
989 | underlying object lives only in the elaboration routine. */ | |
990 | || (TREE_CODE (inner) == INDIRECT_REF | |
991 | && (inner | |
992 | = remove_conversions (TREE_OPERAND (inner, 0), true)) | |
993 | && TREE_CODE (inner) == VAR_DECL | |
994 | && DECL_RETURN_VALUE_P (inner))) | |
7194767c | 995 | ; |
a1ab4c31 | 996 | |
7194767c | 997 | /* Case 2: if the renaming entity need not be materialized, use |
241125b2 EB |
998 | the elaborated renamed expression for the renaming. But this |
999 | means that the caller is responsible for evaluating the address | |
fc7a823e | 1000 | of the renaming in the correct place for the definition case to |
241125b2 | 1001 | instantiate the SAVE_EXPRs. */ |
93e708f9 | 1002 | else if (!Materialize_Entity (gnat_entity)) |
a1ab4c31 | 1003 | { |
fc7a823e EB |
1004 | tree init = NULL_TREE; |
1005 | ||
241125b2 | 1006 | gnu_decl |
fc7a823e EB |
1007 | = elaborate_reference (gnu_expr, gnat_entity, definition, |
1008 | &init); | |
1009 | ||
1010 | /* We cannot evaluate the first arm of a COMPOUND_EXPR in the | |
93e708f9 | 1011 | correct place for this case. */ |
7c775aca | 1012 | gcc_assert (!init); |
a1ab4c31 | 1013 | |
241125b2 EB |
1014 | /* No DECL_EXPR will be created so the expression needs to be |
1015 | marked manually because it will likely be shared. */ | |
7194767c EB |
1016 | if (global_bindings_p ()) |
1017 | MARK_VISITED (gnu_decl); | |
a1ab4c31 | 1018 | |
241125b2 EB |
1019 | /* This assertion will fail if the renamed object isn't aligned |
1020 | enough as to make it possible to honor the alignment set on | |
1021 | the renaming. */ | |
7194767c EB |
1022 | if (align) |
1023 | { | |
1024 | unsigned int ralign = DECL_P (gnu_decl) | |
1025 | ? DECL_ALIGN (gnu_decl) | |
1026 | : TYPE_ALIGN (TREE_TYPE (gnu_decl)); | |
1027 | gcc_assert (ralign >= align); | |
a1ab4c31 AC |
1028 | } |
1029 | ||
7194767c EB |
1030 | save_gnu_tree (gnat_entity, gnu_decl, true); |
1031 | saved = true; | |
1032 | annotate_object (gnat_entity, gnu_type, NULL_TREE, false); | |
1033 | break; | |
1034 | } | |
a1ab4c31 | 1035 | |
7194767c | 1036 | /* Case 3: otherwise, make a constant pointer to the object we |
241125b2 EB |
1037 | are renaming and attach the object to the pointer after it is |
1038 | elaborated. The object will be referenced directly instead | |
1039 | of indirectly via the pointer to avoid aliasing problems with | |
1040 | non-addressable entities. The pointer is called a "renaming" | |
1041 | pointer in this case. Note that we also need to preserve the | |
1042 | volatility of the renamed object through the indirection. */ | |
7194767c EB |
1043 | else |
1044 | { | |
fc7a823e EB |
1045 | tree init = NULL_TREE; |
1046 | ||
e297e2ea | 1047 | if (TREE_THIS_VOLATILE (gnu_expr) && !TYPE_VOLATILE (gnu_type)) |
4aecc2f8 EB |
1048 | gnu_type |
1049 | = change_qualified_type (gnu_type, TYPE_QUAL_VOLATILE); | |
e297e2ea | 1050 | gnu_type = build_reference_type (gnu_type); |
241125b2 | 1051 | used_by_ref = true; |
e297e2ea | 1052 | const_flag = true; |
2056c5ed | 1053 | volatile_flag = false; |
241125b2 EB |
1054 | inner_const_flag = TREE_READONLY (gnu_expr); |
1055 | gnu_size = NULL_TREE; | |
a1ab4c31 | 1056 | |
241125b2 | 1057 | renamed_obj |
fc7a823e EB |
1058 | = elaborate_reference (gnu_expr, gnat_entity, definition, |
1059 | &init); | |
e297e2ea | 1060 | |
1878be32 EB |
1061 | /* The expression needs to be marked manually because it will |
1062 | likely be shared, even for a definition since the ADDR_EXPR | |
1063 | built below can cause the first few nodes to be folded. */ | |
1064 | if (global_bindings_p ()) | |
241125b2 | 1065 | MARK_VISITED (renamed_obj); |
a1ab4c31 | 1066 | |
e297e2ea | 1067 | if (type_annotate_only |
241125b2 | 1068 | && TREE_CODE (renamed_obj) == ERROR_MARK) |
e297e2ea EB |
1069 | gnu_expr = NULL_TREE; |
1070 | else | |
fc7a823e EB |
1071 | { |
1072 | gnu_expr | |
1073 | = build_unary_op (ADDR_EXPR, gnu_type, renamed_obj); | |
1074 | if (init) | |
1075 | gnu_expr | |
1076 | = build_compound_expr (TREE_TYPE (gnu_expr), init, | |
1077 | gnu_expr); | |
1078 | } | |
a1ab4c31 AC |
1079 | } |
1080 | } | |
1081 | ||
9cf18af8 EB |
1082 | /* If we are defining an aliased object whose nominal subtype is |
1083 | unconstrained, the object is a record that contains both the | |
1084 | template and the object. If there is an initializer, it will | |
1085 | have already been converted to the right type, but we need to | |
1086 | create the template if there is no initializer. */ | |
1087 | if (definition | |
1088 | && !gnu_expr | |
1089 | && TREE_CODE (gnu_type) == RECORD_TYPE | |
1090 | && (TYPE_CONTAINS_TEMPLATE_P (gnu_type) | |
afb4afcd | 1091 | /* Beware that padding might have been introduced above. */ |
315cff15 | 1092 | || (TYPE_PADDING_P (gnu_type) |
9cf18af8 EB |
1093 | && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type))) |
1094 | == RECORD_TYPE | |
1095 | && TYPE_CONTAINS_TEMPLATE_P | |
1096 | (TREE_TYPE (TYPE_FIELDS (gnu_type)))))) | |
a1ab4c31 AC |
1097 | { |
1098 | tree template_field | |
315cff15 | 1099 | = TYPE_PADDING_P (gnu_type) |
a1ab4c31 AC |
1100 | ? TYPE_FIELDS (TREE_TYPE (TYPE_FIELDS (gnu_type))) |
1101 | : TYPE_FIELDS (gnu_type); | |
9771b263 DN |
1102 | vec<constructor_elt, va_gc> *v; |
1103 | vec_alloc (v, 1); | |
0e228dd9 | 1104 | tree t = build_template (TREE_TYPE (template_field), |
910ad8de | 1105 | TREE_TYPE (DECL_CHAIN (template_field)), |
0e228dd9 NF |
1106 | NULL_TREE); |
1107 | CONSTRUCTOR_APPEND_ELT (v, template_field, t); | |
1108 | gnu_expr = gnat_build_constructor (gnu_type, v); | |
a1ab4c31 AC |
1109 | } |
1110 | ||
fc7a823e EB |
1111 | /* Convert the expression to the type of the object if need be. */ |
1112 | if (gnu_expr && initial_value_needs_conversion (gnu_type, gnu_expr)) | |
a1ab4c31 AC |
1113 | gnu_expr = convert (gnu_type, gnu_expr); |
1114 | ||
86060344 | 1115 | /* If this is a pointer that doesn't have an initializing expression, |
b3b5c6a2 EB |
1116 | initialize it to NULL, unless the object is declared imported as |
1117 | per RM B.1(24). */ | |
a1ab4c31 | 1118 | if (definition |
315cff15 | 1119 | && (POINTER_TYPE_P (gnu_type) || TYPE_IS_FAT_POINTER_P (gnu_type)) |
86060344 EB |
1120 | && !gnu_expr |
1121 | && !Is_Imported (gnat_entity)) | |
a1ab4c31 AC |
1122 | gnu_expr = integer_zero_node; |
1123 | ||
8df2e902 EB |
1124 | /* If we are defining the object and it has an Address clause, we must |
1125 | either get the address expression from the saved GCC tree for the | |
1126 | object if it has a Freeze node, or elaborate the address expression | |
1127 | here since the front-end has guaranteed that the elaboration has no | |
1128 | effects in this case. */ | |
a1ab4c31 AC |
1129 | if (definition && Present (Address_Clause (gnat_entity))) |
1130 | { | |
73a1a803 EB |
1131 | const Node_Id gnat_clause = Address_Clause (gnat_entity); |
1132 | Node_Id gnat_expr = Expression (gnat_clause); | |
a1ab4c31 | 1133 | tree gnu_address |
8df2e902 | 1134 | = present_gnu_tree (gnat_entity) |
86060344 | 1135 | ? get_gnu_tree (gnat_entity) : gnat_to_gnu (gnat_expr); |
a1ab4c31 AC |
1136 | |
1137 | save_gnu_tree (gnat_entity, NULL_TREE, false); | |
1138 | ||
a1ab4c31 | 1139 | /* Convert the type of the object to a reference type that can |
b3b5c6a2 | 1140 | alias everything as per RM 13.3(19). */ |
2056c5ed EB |
1141 | if (volatile_flag && !TYPE_VOLATILE (gnu_type)) |
1142 | gnu_type = change_qualified_type (gnu_type, TYPE_QUAL_VOLATILE); | |
a1ab4c31 AC |
1143 | gnu_type |
1144 | = build_reference_type_for_mode (gnu_type, ptr_mode, true); | |
1145 | gnu_address = convert (gnu_type, gnu_address); | |
1146 | used_by_ref = true; | |
86060344 | 1147 | const_flag |
2056c5ed EB |
1148 | = (!Is_Public (gnat_entity) |
1149 | || compile_time_known_address_p (gnat_expr)); | |
1150 | volatile_flag = false; | |
241125b2 | 1151 | gnu_size = NULL_TREE; |
a1ab4c31 | 1152 | |
73a1a803 EB |
1153 | /* If this is an aliased object with an unconstrained array nominal |
1154 | subtype, then it can overlay only another aliased object with an | |
1155 | unconstrained array nominal subtype and compatible template. */ | |
1156 | if (Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity)) | |
1157 | && Is_Array_Type (Underlying_Type (Etype (gnat_entity))) | |
1158 | && !type_annotate_only) | |
1159 | { | |
1160 | tree rec_type = TREE_TYPE (gnu_type); | |
1161 | tree off = byte_position (DECL_CHAIN (TYPE_FIELDS (rec_type))); | |
1162 | ||
1163 | /* This is the pattern built for a regular object. */ | |
1164 | if (TREE_CODE (gnu_address) == POINTER_PLUS_EXPR | |
1165 | && TREE_OPERAND (gnu_address, 1) == off) | |
1166 | gnu_address = TREE_OPERAND (gnu_address, 0); | |
1167 | /* This is the pattern built for an overaligned object. */ | |
1168 | else if (TREE_CODE (gnu_address) == POINTER_PLUS_EXPR | |
1169 | && TREE_CODE (TREE_OPERAND (gnu_address, 1)) | |
1170 | == PLUS_EXPR | |
1171 | && TREE_OPERAND (TREE_OPERAND (gnu_address, 1), 1) | |
1172 | == off) | |
1173 | gnu_address | |
1174 | = build2 (POINTER_PLUS_EXPR, gnu_type, | |
1175 | TREE_OPERAND (gnu_address, 0), | |
1176 | TREE_OPERAND (TREE_OPERAND (gnu_address, 1), 0)); | |
1177 | else | |
1178 | { | |
1179 | post_error_ne ("aliased object& with unconstrained array " | |
1180 | "nominal subtype", gnat_clause, | |
1181 | gnat_entity); | |
1182 | post_error ("\\can overlay only aliased object with " | |
1183 | "compatible subtype", gnat_clause); | |
1184 | } | |
1185 | } | |
1186 | ||
a1ab4c31 AC |
1187 | /* If we don't have an initializing expression for the underlying |
1188 | variable, the initializing expression for the pointer is the | |
1189 | specified address. Otherwise, we have to make a COMPOUND_EXPR | |
1190 | to assign both the address and the initial value. */ | |
1191 | if (!gnu_expr) | |
1192 | gnu_expr = gnu_address; | |
1193 | else | |
1194 | gnu_expr | |
1195 | = build2 (COMPOUND_EXPR, gnu_type, | |
73a1a803 EB |
1196 | build_binary_op (INIT_EXPR, NULL_TREE, |
1197 | build_unary_op (INDIRECT_REF, | |
1198 | NULL_TREE, | |
1199 | gnu_address), | |
1200 | gnu_expr), | |
a1ab4c31 AC |
1201 | gnu_address); |
1202 | } | |
1203 | ||
1204 | /* If it has an address clause and we are not defining it, mark it | |
1205 | as an indirect object. Likewise for Stdcall objects that are | |
1206 | imported. */ | |
1207 | if ((!definition && Present (Address_Clause (gnat_entity))) | |
b3b5c6a2 | 1208 | || (imported_p && Has_Stdcall_Convention (gnat_entity))) |
a1ab4c31 AC |
1209 | { |
1210 | /* Convert the type of the object to a reference type that can | |
b3b5c6a2 | 1211 | alias everything as per RM 13.3(19). */ |
2056c5ed EB |
1212 | if (volatile_flag && !TYPE_VOLATILE (gnu_type)) |
1213 | gnu_type = change_qualified_type (gnu_type, TYPE_QUAL_VOLATILE); | |
a1ab4c31 AC |
1214 | gnu_type |
1215 | = build_reference_type_for_mode (gnu_type, ptr_mode, true); | |
241125b2 | 1216 | used_by_ref = true; |
2056c5ed EB |
1217 | const_flag = false; |
1218 | volatile_flag = false; | |
a1ab4c31 AC |
1219 | gnu_size = NULL_TREE; |
1220 | ||
1221 | /* No point in taking the address of an initializing expression | |
1222 | that isn't going to be used. */ | |
1223 | gnu_expr = NULL_TREE; | |
1224 | ||
1225 | /* If it has an address clause whose value is known at compile | |
1226 | time, make the object a CONST_DECL. This will avoid a | |
1227 | useless dereference. */ | |
1228 | if (Present (Address_Clause (gnat_entity))) | |
1229 | { | |
1230 | Node_Id gnat_address | |
1231 | = Expression (Address_Clause (gnat_entity)); | |
1232 | ||
1233 | if (compile_time_known_address_p (gnat_address)) | |
1234 | { | |
1235 | gnu_expr = gnat_to_gnu (gnat_address); | |
1236 | const_flag = true; | |
1237 | } | |
1238 | } | |
a1ab4c31 AC |
1239 | } |
1240 | ||
1241 | /* If we are at top level and this object is of variable size, | |
1242 | make the actual type a hidden pointer to the real type and | |
1243 | make the initializer be a memory allocation and initialization. | |
1244 | Likewise for objects we aren't defining (presumed to be | |
1245 | external references from other packages), but there we do | |
1246 | not set up an initialization. | |
1247 | ||
1248 | If the object's size overflows, make an allocator too, so that | |
1249 | Storage_Error gets raised. Note that we will never free | |
1250 | such memory, so we presume it never will get allocated. */ | |
a1ab4c31 | 1251 | if (!allocatable_size_p (TYPE_SIZE_UNIT (gnu_type), |
86060344 EB |
1252 | global_bindings_p () |
1253 | || !definition | |
2056c5ed | 1254 | || static_flag) |
f54ee980 EB |
1255 | || (gnu_size |
1256 | && !allocatable_size_p (convert (sizetype, | |
1257 | size_binop | |
1258 | (CEIL_DIV_EXPR, gnu_size, | |
1259 | bitsize_unit_node)), | |
1260 | global_bindings_p () | |
1261 | || !definition | |
2056c5ed | 1262 | || static_flag))) |
a1ab4c31 | 1263 | { |
2056c5ed EB |
1264 | if (volatile_flag && !TYPE_VOLATILE (gnu_type)) |
1265 | gnu_type = change_qualified_type (gnu_type, TYPE_QUAL_VOLATILE); | |
a1ab4c31 | 1266 | gnu_type = build_reference_type (gnu_type); |
a1ab4c31 | 1267 | used_by_ref = true; |
241125b2 | 1268 | const_flag = true; |
2056c5ed | 1269 | volatile_flag = false; |
241125b2 | 1270 | gnu_size = NULL_TREE; |
a1ab4c31 AC |
1271 | |
1272 | /* In case this was a aliased object whose nominal subtype is | |
1273 | unconstrained, the pointer above will be a thin pointer and | |
1274 | build_allocator will automatically make the template. | |
1275 | ||
1276 | If we have a template initializer only (that we made above), | |
1277 | pretend there is none and rely on what build_allocator creates | |
1278 | again anyway. Otherwise (if we have a full initializer), get | |
1279 | the data part and feed that to build_allocator. | |
1280 | ||
1281 | If we are elaborating a mutable object, tell build_allocator to | |
1282 | ignore a possibly simpler size from the initializer, if any, as | |
1283 | we must allocate the maximum possible size in this case. */ | |
f25496f3 | 1284 | if (definition && !imported_p) |
a1ab4c31 AC |
1285 | { |
1286 | tree gnu_alloc_type = TREE_TYPE (gnu_type); | |
1287 | ||
1288 | if (TREE_CODE (gnu_alloc_type) == RECORD_TYPE | |
1289 | && TYPE_CONTAINS_TEMPLATE_P (gnu_alloc_type)) | |
1290 | { | |
1291 | gnu_alloc_type | |
910ad8de | 1292 | = TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (gnu_alloc_type))); |
a1ab4c31 AC |
1293 | |
1294 | if (TREE_CODE (gnu_expr) == CONSTRUCTOR | |
2117b9bb EB |
1295 | && vec_safe_length (CONSTRUCTOR_ELTS (gnu_expr)) == 1) |
1296 | gnu_expr = NULL_TREE; | |
a1ab4c31 AC |
1297 | else |
1298 | gnu_expr | |
1299 | = build_component_ref | |
64235766 | 1300 | (gnu_expr, |
910ad8de | 1301 | DECL_CHAIN (TYPE_FIELDS (TREE_TYPE (gnu_expr))), |
a1ab4c31 AC |
1302 | false); |
1303 | } | |
1304 | ||
1305 | if (TREE_CODE (TYPE_SIZE_UNIT (gnu_alloc_type)) == INTEGER_CST | |
ce3da0d0 | 1306 | && !valid_constant_size_p (TYPE_SIZE_UNIT (gnu_alloc_type))) |
c01fe451 | 1307 | post_error ("?`Storage_Error` will be raised at run time!", |
a1ab4c31 AC |
1308 | gnat_entity); |
1309 | ||
6f61bd41 EB |
1310 | gnu_expr |
1311 | = build_allocator (gnu_alloc_type, gnu_expr, gnu_type, | |
1312 | Empty, Empty, gnat_entity, mutable_p); | |
a1ab4c31 AC |
1313 | } |
1314 | else | |
241125b2 | 1315 | gnu_expr = NULL_TREE; |
a1ab4c31 AC |
1316 | } |
1317 | ||
1318 | /* If this object would go into the stack and has an alignment larger | |
1319 | than the largest stack alignment the back-end can honor, resort to | |
1320 | a variable of "aligning type". */ | |
73a1a803 EB |
1321 | if (definition |
1322 | && !global_bindings_p () | |
2056c5ed | 1323 | && !static_flag |
73a1a803 EB |
1324 | && !imported_p |
1325 | && TYPE_ALIGN (gnu_type) > BIGGEST_ALIGNMENT) | |
a1ab4c31 AC |
1326 | { |
1327 | /* Create the new variable. No need for extra room before the | |
1328 | aligned field as this is in automatic storage. */ | |
1329 | tree gnu_new_type | |
1330 | = make_aligning_type (gnu_type, TYPE_ALIGN (gnu_type), | |
1331 | TYPE_SIZE_UNIT (gnu_type), | |
0746af5e | 1332 | BIGGEST_ALIGNMENT, 0, gnat_entity); |
a1ab4c31 AC |
1333 | tree gnu_new_var |
1334 | = create_var_decl (create_concat_name (gnat_entity, "ALIGN"), | |
2056c5ed EB |
1335 | NULL_TREE, gnu_new_type, NULL_TREE, |
1336 | false, false, false, false, false, | |
1337 | true, debug_info_p, NULL, gnat_entity); | |
a1ab4c31 AC |
1338 | |
1339 | /* Initialize the aligned field if we have an initializer. */ | |
1340 | if (gnu_expr) | |
1341 | add_stmt_with_node | |
73a1a803 | 1342 | (build_binary_op (INIT_EXPR, NULL_TREE, |
a1ab4c31 | 1343 | build_component_ref |
64235766 EB |
1344 | (gnu_new_var, TYPE_FIELDS (gnu_new_type), |
1345 | false), | |
a1ab4c31 AC |
1346 | gnu_expr), |
1347 | gnat_entity); | |
1348 | ||
1349 | /* And setup this entity as a reference to the aligned field. */ | |
1350 | gnu_type = build_reference_type (gnu_type); | |
1351 | gnu_expr | |
1352 | = build_unary_op | |
73a1a803 | 1353 | (ADDR_EXPR, NULL_TREE, |
64235766 EB |
1354 | build_component_ref (gnu_new_var, TYPE_FIELDS (gnu_new_type), |
1355 | false)); | |
73a1a803 | 1356 | TREE_CONSTANT (gnu_expr) = 1; |
a1ab4c31 | 1357 | |
a1ab4c31 AC |
1358 | used_by_ref = true; |
1359 | const_flag = true; | |
2056c5ed | 1360 | volatile_flag = false; |
241125b2 | 1361 | gnu_size = NULL_TREE; |
a1ab4c31 AC |
1362 | } |
1363 | ||
73a1a803 EB |
1364 | /* If this is an aliased object with an unconstrained array nominal |
1365 | subtype, we make its type a thin reference, i.e. the reference | |
1366 | counterpart of a thin pointer, so it points to the array part. | |
1367 | This is aimed to make it easier for the debugger to decode the | |
1368 | object. Note that we have to do it this late because of the | |
1369 | couple of allocation adjustments that might be made above. */ | |
184d436a | 1370 | if (Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity)) |
43a4dd82 | 1371 | && Is_Array_Type (Underlying_Type (Etype (gnat_entity))) |
184d436a EB |
1372 | && !type_annotate_only) |
1373 | { | |
184d436a EB |
1374 | /* In case the object with the template has already been allocated |
1375 | just above, we have nothing to do here. */ | |
1376 | if (!TYPE_IS_THIN_POINTER_P (gnu_type)) | |
1377 | { | |
c1a569ef EB |
1378 | /* This variable is a GNAT encoding used by Workbench: let it |
1379 | go through the debugging information but mark it as | |
1380 | artificial: users are not interested in it. */ | |
184179f1 EB |
1381 | tree gnu_unc_var |
1382 | = create_var_decl (concat_name (gnu_entity_name, "UNC"), | |
1383 | NULL_TREE, gnu_type, gnu_expr, | |
1384 | const_flag, Is_Public (gnat_entity), | |
2056c5ed EB |
1385 | imported_p || !definition, static_flag, |
1386 | volatile_flag, true, debug_info_p, | |
1387 | NULL, gnat_entity); | |
73a1a803 | 1388 | gnu_expr = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_unc_var); |
184179f1 | 1389 | TREE_CONSTANT (gnu_expr) = 1; |
184d436a | 1390 | |
184179f1 EB |
1391 | used_by_ref = true; |
1392 | const_flag = true; | |
2056c5ed | 1393 | volatile_flag = false; |
241125b2 EB |
1394 | inner_const_flag = TREE_READONLY (gnu_unc_var); |
1395 | gnu_size = NULL_TREE; | |
184d436a EB |
1396 | } |
1397 | ||
73a1a803 EB |
1398 | tree gnu_array |
1399 | = gnat_to_gnu_type (Base_Type (Etype (gnat_entity))); | |
184d436a EB |
1400 | gnu_type |
1401 | = build_reference_type (TYPE_OBJECT_RECORD_TYPE (gnu_array)); | |
1402 | } | |
1403 | ||
a1ab4c31 | 1404 | if (const_flag) |
4aecc2f8 | 1405 | gnu_type = change_qualified_type (gnu_type, TYPE_QUAL_CONST); |
a1ab4c31 | 1406 | |
fc7a823e EB |
1407 | /* Convert the expression to the type of the object if need be. */ |
1408 | if (gnu_expr && initial_value_needs_conversion (gnu_type, gnu_expr)) | |
a1ab4c31 AC |
1409 | gnu_expr = convert (gnu_type, gnu_expr); |
1410 | ||
1eb58520 AC |
1411 | /* If this name is external or a name was specified, use it, but don't |
1412 | use the Interface_Name with an address clause (see cd30005). */ | |
b3b5c6a2 EB |
1413 | if ((Is_Public (gnat_entity) && !Is_Imported (gnat_entity)) |
1414 | || (Present (Interface_Name (gnat_entity)) | |
1415 | && No (Address_Clause (gnat_entity)))) | |
0fb2335d | 1416 | gnu_ext_name = create_concat_name (gnat_entity, NULL); |
a1ab4c31 | 1417 | |
58c8f770 EB |
1418 | /* If this is an aggregate constant initialized to a constant, force it |
1419 | to be statically allocated. This saves an initialization copy. */ | |
2056c5ed | 1420 | if (!static_flag |
58c8f770 | 1421 | && const_flag |
a5b8aacd EB |
1422 | && gnu_expr && TREE_CONSTANT (gnu_expr) |
1423 | && AGGREGATE_TYPE_P (gnu_type) | |
cc269bb6 | 1424 | && tree_fits_uhwi_p (TYPE_SIZE_UNIT (gnu_type)) |
315cff15 | 1425 | && !(TYPE_IS_PADDING_P (gnu_type) |
5a36c51b RS |
1426 | && !tree_fits_uhwi_p (TYPE_SIZE_UNIT |
1427 | (TREE_TYPE (TYPE_FIELDS (gnu_type)))))) | |
2056c5ed | 1428 | static_flag = true; |
a1ab4c31 | 1429 | |
0567ae8d AC |
1430 | /* Deal with a pragma Linker_Section on a constant or variable. */ |
1431 | if ((kind == E_Constant || kind == E_Variable) | |
1432 | && Present (Linker_Section_Pragma (gnat_entity))) | |
1433 | prepend_one_attribute_pragma (&attr_list, | |
1434 | Linker_Section_Pragma (gnat_entity)); | |
1435 | ||
86060344 | 1436 | /* Now create the variable or the constant and set various flags. */ |
58c8f770 | 1437 | gnu_decl |
6249559b EB |
1438 | = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type, |
1439 | gnu_expr, const_flag, Is_Public (gnat_entity), | |
2056c5ed EB |
1440 | imported_p || !definition, static_flag, |
1441 | volatile_flag, artificial_p, debug_info_p, | |
1442 | attr_list, gnat_entity, !renamed_obj); | |
a1ab4c31 AC |
1443 | DECL_BY_REF_P (gnu_decl) = used_by_ref; |
1444 | DECL_POINTS_TO_READONLY_P (gnu_decl) = used_by_ref && inner_const_flag; | |
a1c7d797 | 1445 | DECL_CAN_NEVER_BE_NULL_P (gnu_decl) = Can_Never_Be_Null (gnat_entity); |
86060344 EB |
1446 | |
1447 | /* If we are defining an Out parameter and optimization isn't enabled, | |
1448 | create a fake PARM_DECL for debugging purposes and make it point to | |
1449 | the VAR_DECL. Suppress debug info for the latter but make sure it | |
f036807a | 1450 | will live in memory so that it can be accessed from within the |
86060344 | 1451 | debugger through the PARM_DECL. */ |
cd177257 EB |
1452 | if (kind == E_Out_Parameter |
1453 | && definition | |
1454 | && debug_info_p | |
1455 | && !optimize | |
1456 | && !flag_generate_lto) | |
86060344 EB |
1457 | { |
1458 | tree param = create_param_decl (gnu_entity_name, gnu_type, false); | |
1459 | gnat_pushdecl (param, gnat_entity); | |
1460 | SET_DECL_VALUE_EXPR (param, gnu_decl); | |
1461 | DECL_HAS_VALUE_EXPR_P (param) = 1; | |
1462 | DECL_IGNORED_P (gnu_decl) = 1; | |
1463 | TREE_ADDRESSABLE (gnu_decl) = 1; | |
1464 | } | |
1465 | ||
15bf7d19 EB |
1466 | /* If this is a loop parameter, set the corresponding flag. */ |
1467 | else if (kind == E_Loop_Parameter) | |
1468 | DECL_LOOP_PARM_P (gnu_decl) = 1; | |
1469 | ||
241125b2 | 1470 | /* If this is a renaming pointer, attach the renamed object to it. */ |
e297e2ea | 1471 | if (renamed_obj) |
241125b2 | 1472 | SET_DECL_RENAMED_OBJECT (gnu_decl, renamed_obj); |
a1ab4c31 | 1473 | |
86060344 EB |
1474 | /* If this is a constant and we are defining it or it generates a real |
1475 | symbol at the object level and we are referencing it, we may want | |
1476 | or need to have a true variable to represent it: | |
1477 | - if optimization isn't enabled, for debugging purposes, | |
1478 | - if the constant is public and not overlaid on something else, | |
1479 | - if its address is taken, | |
1480 | - if either itself or its type is aliased. */ | |
a1ab4c31 AC |
1481 | if (TREE_CODE (gnu_decl) == CONST_DECL |
1482 | && (definition || Sloc (gnat_entity) > Standard_Location) | |
86060344 EB |
1483 | && ((!optimize && debug_info_p) |
1484 | || (Is_Public (gnat_entity) | |
1485 | && No (Address_Clause (gnat_entity))) | |
a1ab4c31 AC |
1486 | || Address_Taken (gnat_entity) |
1487 | || Is_Aliased (gnat_entity) | |
1488 | || Is_Aliased (Etype (gnat_entity)))) | |
1489 | { | |
1490 | tree gnu_corr_var | |
6249559b EB |
1491 | = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type, |
1492 | gnu_expr, true, Is_Public (gnat_entity), | |
2056c5ed EB |
1493 | !definition, static_flag, volatile_flag, |
1494 | artificial_p, debug_info_p, attr_list, | |
1495 | gnat_entity, false); | |
a1ab4c31 AC |
1496 | |
1497 | SET_DECL_CONST_CORRESPONDING_VAR (gnu_decl, gnu_corr_var); | |
a1ab4c31 AC |
1498 | } |
1499 | ||
cb3d597d EB |
1500 | /* If this is a constant, even if we don't need a true variable, we |
1501 | may need to avoid returning the initializer in every case. That | |
1502 | can happen for the address of a (constant) constructor because, | |
1503 | upon dereferencing it, the constructor will be reinjected in the | |
1504 | tree, which may not be valid in every case; see lvalue_required_p | |
1505 | for more details. */ | |
1506 | if (TREE_CODE (gnu_decl) == CONST_DECL) | |
1507 | DECL_CONST_ADDRESS_P (gnu_decl) = constructor_address_p (gnu_expr); | |
1508 | ||
86060344 EB |
1509 | /* If this object is declared in a block that contains a block with an |
1510 | exception handler, and we aren't using the GCC exception mechanism, | |
1511 | we must force this variable in memory in order to avoid an invalid | |
1512 | optimization. */ | |
0ab0bf95 | 1513 | if (Front_End_Exceptions () |
86060344 | 1514 | && Has_Nested_Block_With_Handler (Scope (gnat_entity))) |
a1ab4c31 AC |
1515 | TREE_ADDRESSABLE (gnu_decl) = 1; |
1516 | ||
f036807a EB |
1517 | /* If this is a local variable with non-BLKmode and aggregate type, |
1518 | and optimization isn't enabled, then force it in memory so that | |
1519 | a register won't be allocated to it with possible subparts left | |
1520 | uninitialized and reaching the register allocator. */ | |
1521 | else if (TREE_CODE (gnu_decl) == VAR_DECL | |
1522 | && !DECL_EXTERNAL (gnu_decl) | |
1523 | && !TREE_STATIC (gnu_decl) | |
1524 | && DECL_MODE (gnu_decl) != BLKmode | |
1525 | && AGGREGATE_TYPE_P (TREE_TYPE (gnu_decl)) | |
1526 | && !TYPE_IS_FAT_POINTER_P (TREE_TYPE (gnu_decl)) | |
1527 | && !optimize) | |
1528 | TREE_ADDRESSABLE (gnu_decl) = 1; | |
1529 | ||
86060344 EB |
1530 | /* If we are defining an object with variable size or an object with |
1531 | fixed size that will be dynamically allocated, and we are using the | |
0ab0bf95 OH |
1532 | front-end setjmp/longjmp exception mechanism, update the setjmp |
1533 | buffer. */ | |
86060344 | 1534 | if (definition |
0ab0bf95 | 1535 | && Exception_Mechanism == Front_End_SJLJ |
86060344 EB |
1536 | && get_block_jmpbuf_decl () |
1537 | && DECL_SIZE_UNIT (gnu_decl) | |
1538 | && (TREE_CODE (DECL_SIZE_UNIT (gnu_decl)) != INTEGER_CST | |
1539 | || (flag_stack_check == GENERIC_STACK_CHECK | |
1540 | && compare_tree_int (DECL_SIZE_UNIT (gnu_decl), | |
1541 | STACK_CHECK_MAX_VAR_SIZE) > 0))) | |
dddf8120 EB |
1542 | add_stmt_with_node (build_call_n_expr |
1543 | (update_setjmp_buf_decl, 1, | |
86060344 EB |
1544 | build_unary_op (ADDR_EXPR, NULL_TREE, |
1545 | get_block_jmpbuf_decl ())), | |
1546 | gnat_entity); | |
1547 | ||
f4cd2542 EB |
1548 | /* Back-annotate Esize and Alignment of the object if not already |
1549 | known. Note that we pick the values of the type, not those of | |
1550 | the object, to shield ourselves from low-level platform-dependent | |
1551 | adjustments like alignment promotion. This is both consistent with | |
1552 | all the treatment above, where alignment and size are set on the | |
1553 | type of the object and not on the object directly, and makes it | |
1554 | possible to support all confirming representation clauses. */ | |
1555 | annotate_object (gnat_entity, TREE_TYPE (gnu_decl), gnu_object_size, | |
491f54a7 | 1556 | used_by_ref); |
a1ab4c31 AC |
1557 | } |
1558 | break; | |
1559 | ||
1560 | case E_Void: | |
1561 | /* Return a TYPE_DECL for "void" that we previously made. */ | |
10069d53 | 1562 | gnu_decl = TYPE_NAME (void_type_node); |
a1ab4c31 AC |
1563 | break; |
1564 | ||
1565 | case E_Enumeration_Type: | |
a8e05f92 | 1566 | /* A special case: for the types Character and Wide_Character in |
2ddc34ba | 1567 | Standard, we do not list all the literals. So if the literals |
825da0d2 | 1568 | are not specified, make this an integer type. */ |
a1ab4c31 AC |
1569 | if (No (First_Literal (gnat_entity))) |
1570 | { | |
825da0d2 EB |
1571 | if (esize == CHAR_TYPE_SIZE && flag_signed_char) |
1572 | gnu_type = make_signed_type (CHAR_TYPE_SIZE); | |
1573 | else | |
1574 | gnu_type = make_unsigned_type (esize); | |
0fb2335d | 1575 | TYPE_NAME (gnu_type) = gnu_entity_name; |
a1ab4c31 | 1576 | |
a8e05f92 | 1577 | /* Set TYPE_STRING_FLAG for Character and Wide_Character types. |
2ddc34ba EB |
1578 | This is needed by the DWARF-2 back-end to distinguish between |
1579 | unsigned integer types and character types. */ | |
a1ab4c31 | 1580 | TYPE_STRING_FLAG (gnu_type) = 1; |
825da0d2 EB |
1581 | |
1582 | /* This flag is needed by the call just below. */ | |
1583 | TYPE_ARTIFICIAL (gnu_type) = artificial_p; | |
1584 | ||
1585 | finish_character_type (gnu_type); | |
a1ab4c31 | 1586 | } |
74746d49 EB |
1587 | else |
1588 | { | |
1589 | /* We have a list of enumeral constants in First_Literal. We make a | |
1590 | CONST_DECL for each one and build into GNU_LITERAL_LIST the list | |
1591 | to be placed into TYPE_FIELDS. Each node is itself a TREE_LIST | |
1592 | whose TREE_VALUE is the literal name and whose TREE_PURPOSE is the | |
1593 | value of the literal. But when we have a regular boolean type, we | |
1594 | simplify this a little by using a BOOLEAN_TYPE. */ | |
1595 | const bool is_boolean = Is_Boolean_Type (gnat_entity) | |
1596 | && !Has_Non_Standard_Rep (gnat_entity); | |
1597 | const bool is_unsigned = Is_Unsigned_Type (gnat_entity); | |
1598 | tree gnu_list = NULL_TREE; | |
1599 | Entity_Id gnat_literal; | |
1600 | ||
1601 | gnu_type = make_node (is_boolean ? BOOLEAN_TYPE : ENUMERAL_TYPE); | |
1602 | TYPE_PRECISION (gnu_type) = esize; | |
1603 | TYPE_UNSIGNED (gnu_type) = is_unsigned; | |
1604 | set_min_and_max_values_for_integral_type (gnu_type, esize, | |
807e902e | 1605 | TYPE_SIGN (gnu_type)); |
74746d49 EB |
1606 | process_attributes (&gnu_type, &attr_list, true, gnat_entity); |
1607 | layout_type (gnu_type); | |
1608 | ||
1609 | for (gnat_literal = First_Literal (gnat_entity); | |
1610 | Present (gnat_literal); | |
1611 | gnat_literal = Next_Literal (gnat_literal)) | |
1612 | { | |
1613 | tree gnu_value | |
1614 | = UI_To_gnu (Enumeration_Rep (gnat_literal), gnu_type); | |
c1a569ef | 1615 | /* Do not generate debug info for individual enumerators. */ |
74746d49 EB |
1616 | tree gnu_literal |
1617 | = create_var_decl (get_entity_name (gnat_literal), NULL_TREE, | |
1618 | gnu_type, gnu_value, true, false, false, | |
2056c5ed EB |
1619 | false, false, artificial_p, false, |
1620 | NULL, gnat_literal); | |
74746d49 EB |
1621 | save_gnu_tree (gnat_literal, gnu_literal, false); |
1622 | gnu_list | |
1623 | = tree_cons (DECL_NAME (gnu_literal), gnu_value, gnu_list); | |
1624 | } | |
a1ab4c31 | 1625 | |
74746d49 EB |
1626 | if (!is_boolean) |
1627 | TYPE_VALUES (gnu_type) = nreverse (gnu_list); | |
a1ab4c31 | 1628 | |
74746d49 EB |
1629 | /* Note that the bounds are updated at the end of this function |
1630 | to avoid an infinite recursion since they refer to the type. */ | |
1631 | goto discrete_type; | |
1632 | } | |
1633 | break; | |
a1ab4c31 AC |
1634 | |
1635 | case E_Signed_Integer_Type: | |
a1ab4c31 AC |
1636 | /* For integer types, just make a signed type the appropriate number |
1637 | of bits. */ | |
1638 | gnu_type = make_signed_type (esize); | |
40d1f6af | 1639 | goto discrete_type; |
a1ab4c31 | 1640 | |
2971780e PMR |
1641 | case E_Ordinary_Fixed_Point_Type: |
1642 | case E_Decimal_Fixed_Point_Type: | |
1643 | { | |
1644 | /* Small_Value is the scale factor. */ | |
1645 | const Ureal gnat_small_value = Small_Value (gnat_entity); | |
1646 | tree scale_factor = NULL_TREE; | |
1647 | ||
1648 | gnu_type = make_signed_type (esize); | |
1649 | ||
1650 | /* Try to decode the scale factor and to save it for the fixed-point | |
1651 | types debug hook. */ | |
1652 | ||
1653 | /* There are various ways to describe the scale factor, however there | |
1654 | are cases where back-end internals cannot hold it. In such cases, | |
1655 | we output invalid scale factor for such cases (i.e. the 0/0 | |
1656 | rational constant) but we expect GNAT to output GNAT encodings, | |
1657 | then. Thus, keep this in sync with | |
1658 | Exp_Dbug.Is_Handled_Scale_Factor. */ | |
1659 | ||
1660 | /* When encoded as 1/2**N or 1/10**N, describe the scale factor as a | |
1661 | binary or decimal scale: it is easier to read for humans. */ | |
1662 | if (UI_Eq (Numerator (gnat_small_value), Uint_1) | |
1663 | && (Rbase (gnat_small_value) == 2 | |
1664 | || Rbase (gnat_small_value) == 10)) | |
1665 | { | |
1666 | /* Given RM restrictions on 'Small values, we assume here that | |
1667 | the denominator fits in an int. */ | |
1668 | const tree base = build_int_cst (integer_type_node, | |
1669 | Rbase (gnat_small_value)); | |
1670 | const tree exponent | |
1671 | = build_int_cst (integer_type_node, | |
1672 | UI_To_Int (Denominator (gnat_small_value))); | |
1673 | scale_factor | |
1674 | = build2 (RDIV_EXPR, integer_type_node, | |
1675 | integer_one_node, | |
1676 | build2 (POWER_EXPR, integer_type_node, | |
1677 | base, exponent)); | |
1678 | } | |
1679 | ||
1680 | /* Default to arbitrary scale factors descriptions. */ | |
1681 | else | |
1682 | { | |
1683 | const Uint num = Norm_Num (gnat_small_value); | |
1684 | const Uint den = Norm_Den (gnat_small_value); | |
1685 | ||
1686 | if (UI_Is_In_Int_Range (num) && UI_Is_In_Int_Range (den)) | |
1687 | { | |
1688 | const tree gnu_num | |
1689 | = build_int_cst (integer_type_node, | |
1690 | UI_To_Int (Norm_Num (gnat_small_value))); | |
1691 | const tree gnu_den | |
1692 | = build_int_cst (integer_type_node, | |
1693 | UI_To_Int (Norm_Den (gnat_small_value))); | |
1694 | scale_factor = build2 (RDIV_EXPR, integer_type_node, | |
1695 | gnu_num, gnu_den); | |
1696 | } | |
1697 | else | |
1698 | /* If compiler internals cannot represent arbitrary scale | |
1699 | factors, output an invalid scale factor so that debugger | |
1700 | don't try to handle them but so that we still have a type | |
1701 | in the output. Note that GNAT */ | |
1702 | scale_factor = integer_zero_node; | |
1703 | } | |
1704 | ||
1705 | TYPE_FIXED_POINT_P (gnu_type) = 1; | |
1706 | SET_TYPE_SCALE_FACTOR (gnu_type, scale_factor); | |
1707 | } | |
1708 | goto discrete_type; | |
1709 | ||
a1ab4c31 | 1710 | case E_Modular_Integer_Type: |
a1ab4c31 | 1711 | { |
b4680ca1 EB |
1712 | /* For modular types, make the unsigned type of the proper number |
1713 | of bits and then set up the modulus, if required. */ | |
1714 | tree gnu_modulus, gnu_high = NULL_TREE; | |
a1ab4c31 | 1715 | |
1a4cb227 AC |
1716 | /* Packed Array Impl. Types are supposed to be subtypes only. */ |
1717 | gcc_assert (!Is_Packed_Array_Impl_Type (gnat_entity)); | |
a1ab4c31 | 1718 | |
a8e05f92 | 1719 | gnu_type = make_unsigned_type (esize); |
a1ab4c31 AC |
1720 | |
1721 | /* Get the modulus in this type. If it overflows, assume it is because | |
1722 | it is equal to 2**Esize. Note that there is no overflow checking | |
1723 | done on unsigned type, so we detect the overflow by looking for | |
1724 | a modulus of zero, which is otherwise invalid. */ | |
1725 | gnu_modulus = UI_To_gnu (Modulus (gnat_entity), gnu_type); | |
1726 | ||
1727 | if (!integer_zerop (gnu_modulus)) | |
1728 | { | |
1729 | TYPE_MODULAR_P (gnu_type) = 1; | |
1730 | SET_TYPE_MODULUS (gnu_type, gnu_modulus); | |
1731 | gnu_high = fold_build2 (MINUS_EXPR, gnu_type, gnu_modulus, | |
9a1bdc31 | 1732 | build_int_cst (gnu_type, 1)); |
a1ab4c31 AC |
1733 | } |
1734 | ||
a8e05f92 EB |
1735 | /* If the upper bound is not maximal, make an extra subtype. */ |
1736 | if (gnu_high | |
1737 | && !tree_int_cst_equal (gnu_high, TYPE_MAX_VALUE (gnu_type))) | |
a1ab4c31 | 1738 | { |
a8e05f92 | 1739 | tree gnu_subtype = make_unsigned_type (esize); |
84fb43a1 | 1740 | SET_TYPE_RM_MAX_VALUE (gnu_subtype, gnu_high); |
a1ab4c31 | 1741 | TREE_TYPE (gnu_subtype) = gnu_type; |
a1ab4c31 | 1742 | TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1; |
a8e05f92 | 1743 | TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "UMT"); |
a1ab4c31 AC |
1744 | gnu_type = gnu_subtype; |
1745 | } | |
1746 | } | |
40d1f6af | 1747 | goto discrete_type; |
a1ab4c31 AC |
1748 | |
1749 | case E_Signed_Integer_Subtype: | |
1750 | case E_Enumeration_Subtype: | |
1751 | case E_Modular_Integer_Subtype: | |
1752 | case E_Ordinary_Fixed_Point_Subtype: | |
1753 | case E_Decimal_Fixed_Point_Subtype: | |
1754 | ||
26383c64 | 1755 | /* For integral subtypes, we make a new INTEGER_TYPE. Note that we do |
84fb43a1 | 1756 | not want to call create_range_type since we would like each subtype |
26383c64 | 1757 | node to be distinct. ??? Historically this was in preparation for |
c1abd261 | 1758 | when memory aliasing is implemented, but that's obsolete now given |
26383c64 | 1759 | the call to relate_alias_sets below. |
a1ab4c31 | 1760 | |
a8e05f92 EB |
1761 | The TREE_TYPE field of the INTEGER_TYPE points to the base type; |
1762 | this fact is used by the arithmetic conversion functions. | |
a1ab4c31 | 1763 | |
a8e05f92 EB |
1764 | We elaborate the Ancestor_Subtype if it is not in the current unit |
1765 | and one of our bounds is non-static. We do this to ensure consistent | |
1766 | naming in the case where several subtypes share the same bounds, by | |
1767 | elaborating the first such subtype first, thus using its name. */ | |
a1ab4c31 AC |
1768 | |
1769 | if (!definition | |
1770 | && Present (Ancestor_Subtype (gnat_entity)) | |
1771 | && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity)) | |
1772 | && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity)) | |
1773 | || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity)))) | |
b4680ca1 | 1774 | gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity), gnu_expr, 0); |
a1ab4c31 | 1775 | |
84fb43a1 | 1776 | /* Set the precision to the Esize except for bit-packed arrays. */ |
1a4cb227 | 1777 | if (Is_Packed_Array_Impl_Type (gnat_entity) |
a1ab4c31 | 1778 | && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))) |
6e0f0975 | 1779 | esize = UI_To_Int (RM_Size (gnat_entity)); |
a1ab4c31 | 1780 | |
825da0d2 EB |
1781 | /* First subtypes of Character are treated as Character; otherwise |
1782 | this should be an unsigned type if the base type is unsigned or | |
84fb43a1 EB |
1783 | if the lower bound is constant and non-negative or if the type |
1784 | is biased. */ | |
825da0d2 EB |
1785 | if (kind == E_Enumeration_Subtype |
1786 | && No (First_Literal (Etype (gnat_entity))) | |
1787 | && Esize (gnat_entity) == RM_Size (gnat_entity) | |
1788 | && esize == CHAR_TYPE_SIZE | |
1789 | && flag_signed_char) | |
1790 | gnu_type = make_signed_type (CHAR_TYPE_SIZE); | |
1791 | else if (Is_Unsigned_Type (Etype (gnat_entity)) | |
1792 | || Is_Unsigned_Type (gnat_entity) | |
1793 | || Has_Biased_Representation (gnat_entity)) | |
84fb43a1 EB |
1794 | gnu_type = make_unsigned_type (esize); |
1795 | else | |
1796 | gnu_type = make_signed_type (esize); | |
1797 | TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity)); | |
a1ab4c31 | 1798 | |
84fb43a1 | 1799 | SET_TYPE_RM_MIN_VALUE |
1eb58520 | 1800 | (gnu_type, elaborate_expression (Type_Low_Bound (gnat_entity), |
bf44701f | 1801 | gnat_entity, "L", definition, true, |
c1a569ef | 1802 | debug_info_p)); |
84fb43a1 EB |
1803 | |
1804 | SET_TYPE_RM_MAX_VALUE | |
1eb58520 | 1805 | (gnu_type, elaborate_expression (Type_High_Bound (gnat_entity), |
bf44701f | 1806 | gnat_entity, "U", definition, true, |
c1a569ef | 1807 | debug_info_p)); |
a1ab4c31 | 1808 | |
74746d49 EB |
1809 | TYPE_BIASED_REPRESENTATION_P (gnu_type) |
1810 | = Has_Biased_Representation (gnat_entity); | |
1811 | ||
825da0d2 EB |
1812 | /* Set TYPE_STRING_FLAG for Character and Wide_Character subtypes. */ |
1813 | TYPE_STRING_FLAG (gnu_type) = TYPE_STRING_FLAG (TREE_TYPE (gnu_type)); | |
1814 | ||
74746d49 EB |
1815 | /* Inherit our alias set from what we're a subtype of. Subtypes |
1816 | are not different types and a pointer can designate any instance | |
1817 | within a subtype hierarchy. */ | |
1818 | relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY); | |
1819 | ||
a1ab4c31 AC |
1820 | /* One of the above calls might have caused us to be elaborated, |
1821 | so don't blow up if so. */ | |
1822 | if (present_gnu_tree (gnat_entity)) | |
1823 | { | |
1824 | maybe_present = true; | |
1825 | break; | |
1826 | } | |
1827 | ||
4fd78fe6 EB |
1828 | /* Attach the TYPE_STUB_DECL in case we have a parallel type. */ |
1829 | TYPE_STUB_DECL (gnu_type) | |
1830 | = create_type_stub_decl (gnu_entity_name, gnu_type); | |
1831 | ||
2d595887 PMR |
1832 | /* For a packed array, make the original array type a parallel/debug |
1833 | type. */ | |
1eb58520 | 1834 | if (debug_info_p && Is_Packed_Array_Impl_Type (gnat_entity)) |
2d595887 | 1835 | associate_original_type_to_packed_array (gnu_type, gnat_entity); |
4fd78fe6 | 1836 | |
40d1f6af EB |
1837 | discrete_type: |
1838 | ||
b1fa9126 EB |
1839 | /* We have to handle clauses that under-align the type specially. */ |
1840 | if ((Present (Alignment_Clause (gnat_entity)) | |
1a4cb227 | 1841 | || (Is_Packed_Array_Impl_Type (gnat_entity) |
b1fa9126 EB |
1842 | && Present |
1843 | (Alignment_Clause (Original_Array_Type (gnat_entity))))) | |
1844 | && UI_Is_In_Int_Range (Alignment (gnat_entity))) | |
1845 | { | |
1846 | align = UI_To_Int (Alignment (gnat_entity)) * BITS_PER_UNIT; | |
1847 | if (align >= TYPE_ALIGN (gnu_type)) | |
1848 | align = 0; | |
1849 | } | |
1850 | ||
6e0f0975 | 1851 | /* If the type we are dealing with represents a bit-packed array, |
a1ab4c31 AC |
1852 | we need to have the bits left justified on big-endian targets |
1853 | and right justified on little-endian targets. We also need to | |
1854 | ensure that when the value is read (e.g. for comparison of two | |
1855 | such values), we only get the good bits, since the unused bits | |
6e0f0975 EB |
1856 | are uninitialized. Both goals are accomplished by wrapping up |
1857 | the modular type in an enclosing record type. */ | |
1a4cb227 | 1858 | if (Is_Packed_Array_Impl_Type (gnat_entity) |
01ddebf2 | 1859 | && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))) |
a1ab4c31 | 1860 | { |
6e0f0975 | 1861 | tree gnu_field_type, gnu_field; |
a1ab4c31 | 1862 | |
b1fa9126 | 1863 | /* Set the RM size before wrapping up the original type. */ |
84fb43a1 EB |
1864 | SET_TYPE_RM_SIZE (gnu_type, |
1865 | UI_To_gnu (RM_Size (gnat_entity), bitsizetype)); | |
6e0f0975 | 1866 | TYPE_PACKED_ARRAY_TYPE_P (gnu_type) = 1; |
b1fa9126 | 1867 | |
2d595887 PMR |
1868 | /* Strip the ___XP suffix for standard DWARF. */ |
1869 | if (gnat_encodings == DWARF_GNAT_ENCODINGS_MINIMAL) | |
1870 | gnu_entity_name = TYPE_NAME (gnu_type); | |
1871 | ||
b1fa9126 | 1872 | /* Create a stripped-down declaration, mainly for debugging. */ |
74746d49 EB |
1873 | create_type_decl (gnu_entity_name, gnu_type, true, debug_info_p, |
1874 | gnat_entity); | |
b1fa9126 EB |
1875 | |
1876 | /* Now save it and build the enclosing record type. */ | |
6e0f0975 EB |
1877 | gnu_field_type = gnu_type; |
1878 | ||
a1ab4c31 AC |
1879 | gnu_type = make_node (RECORD_TYPE); |
1880 | TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "JM"); | |
a1ab4c31 | 1881 | TYPE_PACKED (gnu_type) = 1; |
b1fa9126 EB |
1882 | TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_field_type); |
1883 | TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_field_type); | |
1884 | SET_TYPE_ADA_SIZE (gnu_type, TYPE_RM_SIZE (gnu_field_type)); | |
1885 | ||
1886 | /* Propagate the alignment of the modular type to the record type, | |
1887 | unless there is an alignment clause that under-aligns the type. | |
1888 | This means that bit-packed arrays are given "ceil" alignment for | |
1889 | their size by default, which may seem counter-intuitive but makes | |
1890 | it possible to overlay them on modular types easily. */ | |
fe37c7af MM |
1891 | SET_TYPE_ALIGN (gnu_type, |
1892 | align > 0 ? align : TYPE_ALIGN (gnu_field_type)); | |
a1ab4c31 | 1893 | |
ee45a32d EB |
1894 | /* Propagate the reverse storage order flag to the record type so |
1895 | that the required byte swapping is performed when retrieving the | |
1896 | enclosed modular value. */ | |
1897 | TYPE_REVERSE_STORAGE_ORDER (gnu_type) | |
1898 | = Reverse_Storage_Order (Original_Array_Type (gnat_entity)); | |
1899 | ||
b1fa9126 | 1900 | relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY); |
a1ab4c31 | 1901 | |
40d1f6af EB |
1902 | /* Don't declare the field as addressable since we won't be taking |
1903 | its address and this would prevent create_field_decl from making | |
1904 | a bitfield. */ | |
da01bfee EB |
1905 | gnu_field |
1906 | = create_field_decl (get_identifier ("OBJECT"), gnu_field_type, | |
1907 | gnu_type, NULL_TREE, bitsize_zero_node, 1, 0); | |
a1ab4c31 | 1908 | |
032d1b71 | 1909 | /* Do not emit debug info until after the parallel type is added. */ |
b1fa9126 EB |
1910 | finish_record_type (gnu_type, gnu_field, 2, false); |
1911 | compute_record_mode (gnu_type); | |
a1ab4c31 | 1912 | TYPE_JUSTIFIED_MODULAR_P (gnu_type) = 1; |
a1ab4c31 | 1913 | |
032d1b71 EB |
1914 | if (debug_info_p) |
1915 | { | |
2d595887 PMR |
1916 | /* Make the original array type a parallel/debug type. */ |
1917 | associate_original_type_to_packed_array (gnu_type, gnat_entity); | |
1918 | ||
1919 | /* Since GNU_TYPE is a padding type around the packed array | |
1920 | implementation type, the padded type is its debug type. */ | |
1921 | if (gnat_encodings == DWARF_GNAT_ENCODINGS_MINIMAL) | |
1922 | SET_TYPE_DEBUG_TYPE (gnu_type, gnu_field_type); | |
4fd78fe6 | 1923 | |
032d1b71 EB |
1924 | rest_of_record_type_compilation (gnu_type); |
1925 | } | |
a1ab4c31 AC |
1926 | } |
1927 | ||
1928 | /* If the type we are dealing with has got a smaller alignment than the | |
940ff20c EB |
1929 | natural one, we need to wrap it up in a record type and misalign the |
1930 | latter; we reuse the padding machinery for this purpose. Note that, | |
1931 | even if the record type is marked as packed because of misalignment, | |
1932 | we don't pack the field so as to give it the size of the type. */ | |
b1fa9126 | 1933 | else if (align > 0) |
a1ab4c31 | 1934 | { |
6e0f0975 EB |
1935 | tree gnu_field_type, gnu_field; |
1936 | ||
1937 | /* Set the RM size before wrapping up the type. */ | |
84fb43a1 EB |
1938 | SET_TYPE_RM_SIZE (gnu_type, |
1939 | UI_To_gnu (RM_Size (gnat_entity), bitsizetype)); | |
b1fa9126 EB |
1940 | |
1941 | /* Create a stripped-down declaration, mainly for debugging. */ | |
74746d49 EB |
1942 | create_type_decl (gnu_entity_name, gnu_type, true, debug_info_p, |
1943 | gnat_entity); | |
b1fa9126 EB |
1944 | |
1945 | /* Now save it and build the enclosing record type. */ | |
6e0f0975 | 1946 | gnu_field_type = gnu_type; |
a1ab4c31 AC |
1947 | |
1948 | gnu_type = make_node (RECORD_TYPE); | |
1949 | TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "PAD"); | |
eb59e428 PMR |
1950 | if (gnat_encodings == DWARF_GNAT_ENCODINGS_MINIMAL) |
1951 | SET_TYPE_DEBUG_TYPE (gnu_type, gnu_field_type); | |
a1ab4c31 | 1952 | TYPE_PACKED (gnu_type) = 1; |
b1fa9126 EB |
1953 | TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_field_type); |
1954 | TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_field_type); | |
1955 | SET_TYPE_ADA_SIZE (gnu_type, TYPE_RM_SIZE (gnu_field_type)); | |
fe37c7af | 1956 | SET_TYPE_ALIGN (gnu_type, align); |
b1fa9126 | 1957 | relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY); |
a1ab4c31 | 1958 | |
40d1f6af EB |
1959 | /* Don't declare the field as addressable since we won't be taking |
1960 | its address and this would prevent create_field_decl from making | |
1961 | a bitfield. */ | |
da01bfee EB |
1962 | gnu_field |
1963 | = create_field_decl (get_identifier ("F"), gnu_field_type, | |
940ff20c EB |
1964 | gnu_type, TYPE_SIZE (gnu_field_type), |
1965 | bitsize_zero_node, 0, 0); | |
a1ab4c31 | 1966 | |
b1fa9126 EB |
1967 | finish_record_type (gnu_type, gnu_field, 2, debug_info_p); |
1968 | compute_record_mode (gnu_type); | |
315cff15 | 1969 | TYPE_PADDING_P (gnu_type) = 1; |
a1ab4c31 AC |
1970 | } |
1971 | ||
a1ab4c31 AC |
1972 | break; |
1973 | ||
1974 | case E_Floating_Point_Type: | |
a1ab4c31 AC |
1975 | /* The type of the Low and High bounds can be our type if this is |
1976 | a type from Standard, so set them at the end of the function. */ | |
1977 | gnu_type = make_node (REAL_TYPE); | |
1978 | TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize); | |
1979 | layout_type (gnu_type); | |
1980 | break; | |
1981 | ||
1982 | case E_Floating_Point_Subtype: | |
74746d49 EB |
1983 | /* See the E_Signed_Integer_Subtype case for the rationale. */ |
1984 | if (!definition | |
1985 | && Present (Ancestor_Subtype (gnat_entity)) | |
1986 | && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity)) | |
1987 | && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity)) | |
1988 | || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity)))) | |
1989 | gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity), gnu_expr, 0); | |
a1ab4c31 | 1990 | |
74746d49 EB |
1991 | gnu_type = make_node (REAL_TYPE); |
1992 | TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity)); | |
1993 | TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize); | |
1994 | TYPE_GCC_MIN_VALUE (gnu_type) | |
1995 | = TYPE_GCC_MIN_VALUE (TREE_TYPE (gnu_type)); | |
1996 | TYPE_GCC_MAX_VALUE (gnu_type) | |
1997 | = TYPE_GCC_MAX_VALUE (TREE_TYPE (gnu_type)); | |
1998 | layout_type (gnu_type); | |
1999 | ||
2000 | SET_TYPE_RM_MIN_VALUE | |
1eb58520 | 2001 | (gnu_type, elaborate_expression (Type_Low_Bound (gnat_entity), |
bf44701f | 2002 | gnat_entity, "L", definition, true, |
c1a569ef | 2003 | debug_info_p)); |
74746d49 EB |
2004 | |
2005 | SET_TYPE_RM_MAX_VALUE | |
1eb58520 | 2006 | (gnu_type, elaborate_expression (Type_High_Bound (gnat_entity), |
bf44701f | 2007 | gnat_entity, "U", definition, true, |
c1a569ef | 2008 | debug_info_p)); |
74746d49 EB |
2009 | |
2010 | /* Inherit our alias set from what we're a subtype of, as for | |
2011 | integer subtypes. */ | |
2012 | relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY); | |
2013 | ||
2014 | /* One of the above calls might have caused us to be elaborated, | |
2015 | so don't blow up if so. */ | |
2016 | maybe_present = true; | |
2017 | break; | |
a1ab4c31 | 2018 | |
e8fa3dcd | 2019 | /* Array Types and Subtypes |
a1ab4c31 AC |
2020 | |
2021 | Unconstrained array types are represented by E_Array_Type and | |
2022 | constrained array types are represented by E_Array_Subtype. There | |
2023 | are no actual objects of an unconstrained array type; all we have | |
2024 | are pointers to that type. | |
2025 | ||
2026 | The following fields are defined on array types and subtypes: | |
2027 | ||
2028 | Component_Type Component type of the array. | |
2029 | Number_Dimensions Number of dimensions (an int). | |
2030 | First_Index Type of first index. */ | |
2031 | ||
a1ab4c31 AC |
2032 | case E_Array_Type: |
2033 | { | |
4e6602a8 EB |
2034 | const bool convention_fortran_p |
2035 | = (Convention (gnat_entity) == Convention_Fortran); | |
2036 | const int ndim = Number_Dimensions (gnat_entity); | |
2afda005 TG |
2037 | tree gnu_template_type; |
2038 | tree gnu_ptr_template; | |
e3edbd56 | 2039 | tree gnu_template_reference, gnu_template_fields, gnu_fat_type; |
2bb1fc26 NF |
2040 | tree *gnu_index_types = XALLOCAVEC (tree, ndim); |
2041 | tree *gnu_temp_fields = XALLOCAVEC (tree, ndim); | |
e3edbd56 EB |
2042 | tree gnu_max_size = size_one_node, gnu_max_size_unit, tem, t; |
2043 | Entity_Id gnat_index, gnat_name; | |
4e6602a8 | 2044 | int index; |
9aa04cc7 AC |
2045 | tree comp_type; |
2046 | ||
2047 | /* Create the type for the component now, as it simplifies breaking | |
2048 | type reference loops. */ | |
2049 | comp_type | |
2050 | = gnat_to_gnu_component_type (gnat_entity, definition, debug_info_p); | |
2051 | if (present_gnu_tree (gnat_entity)) | |
2052 | { | |
2053 | /* As a side effect, the type may have been translated. */ | |
2054 | maybe_present = true; | |
2055 | break; | |
2056 | } | |
a1ab4c31 | 2057 | |
e3edbd56 EB |
2058 | /* We complete an existing dummy fat pointer type in place. This both |
2059 | avoids further complex adjustments in update_pointer_to and yields | |
2060 | better debugging information in DWARF by leveraging the support for | |
2061 | incomplete declarations of "tagged" types in the DWARF back-end. */ | |
2062 | gnu_type = get_dummy_type (gnat_entity); | |
2063 | if (gnu_type && TYPE_POINTER_TO (gnu_type)) | |
2064 | { | |
2065 | gnu_fat_type = TYPE_MAIN_VARIANT (TYPE_POINTER_TO (gnu_type)); | |
2066 | TYPE_NAME (gnu_fat_type) = NULL_TREE; | |
2067 | /* Save the contents of the dummy type for update_pointer_to. */ | |
2068 | TYPE_POINTER_TO (gnu_type) = copy_type (gnu_fat_type); | |
2afda005 TG |
2069 | gnu_ptr_template = |
2070 | TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_fat_type))); | |
2071 | gnu_template_type = TREE_TYPE (gnu_ptr_template); | |
e3edbd56 EB |
2072 | } |
2073 | else | |
2afda005 TG |
2074 | { |
2075 | gnu_fat_type = make_node (RECORD_TYPE); | |
2076 | gnu_template_type = make_node (RECORD_TYPE); | |
2077 | gnu_ptr_template = build_pointer_type (gnu_template_type); | |
2078 | } | |
a1ab4c31 AC |
2079 | |
2080 | /* Make a node for the array. If we are not defining the array | |
2081 | suppress expanding incomplete types. */ | |
2082 | gnu_type = make_node (UNCONSTRAINED_ARRAY_TYPE); | |
2083 | ||
2084 | if (!definition) | |
8cd28148 EB |
2085 | { |
2086 | defer_incomplete_level++; | |
2087 | this_deferred = true; | |
2088 | } | |
a1ab4c31 AC |
2089 | |
2090 | /* Build the fat pointer type. Use a "void *" object instead of | |
2091 | a pointer to the array type since we don't have the array type | |
2092 | yet (it will reference the fat pointer via the bounds). */ | |
98cd3025 | 2093 | tem |
1366ba41 | 2094 | = create_field_decl (get_identifier ("P_ARRAY"), ptr_type_node, |
98cd3025 | 2095 | gnu_fat_type, NULL_TREE, NULL_TREE, 0, 0); |
e3edbd56 | 2096 | DECL_CHAIN (tem) |
98cd3025 EB |
2097 | = create_field_decl (get_identifier ("P_BOUNDS"), gnu_ptr_template, |
2098 | gnu_fat_type, NULL_TREE, NULL_TREE, 0, 0); | |
e3edbd56 EB |
2099 | |
2100 | if (COMPLETE_TYPE_P (gnu_fat_type)) | |
2101 | { | |
2102 | /* We are going to lay it out again so reset the alias set. */ | |
2103 | alias_set_type alias_set = TYPE_ALIAS_SET (gnu_fat_type); | |
2104 | TYPE_ALIAS_SET (gnu_fat_type) = -1; | |
2105 | finish_fat_pointer_type (gnu_fat_type, tem); | |
2106 | TYPE_ALIAS_SET (gnu_fat_type) = alias_set; | |
2107 | for (t = gnu_fat_type; t; t = TYPE_NEXT_VARIANT (t)) | |
2108 | { | |
2109 | TYPE_FIELDS (t) = tem; | |
2110 | SET_TYPE_UNCONSTRAINED_ARRAY (t, gnu_type); | |
2111 | } | |
2112 | } | |
2113 | else | |
2114 | { | |
2115 | finish_fat_pointer_type (gnu_fat_type, tem); | |
2116 | SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type, gnu_type); | |
2117 | } | |
a1ab4c31 AC |
2118 | |
2119 | /* Build a reference to the template from a PLACEHOLDER_EXPR that | |
2120 | is the fat pointer. This will be used to access the individual | |
2121 | fields once we build them. */ | |
2122 | tem = build3 (COMPONENT_REF, gnu_ptr_template, | |
2123 | build0 (PLACEHOLDER_EXPR, gnu_fat_type), | |
910ad8de | 2124 | DECL_CHAIN (TYPE_FIELDS (gnu_fat_type)), NULL_TREE); |
a1ab4c31 AC |
2125 | gnu_template_reference |
2126 | = build_unary_op (INDIRECT_REF, gnu_template_type, tem); | |
2127 | TREE_READONLY (gnu_template_reference) = 1; | |
50179d58 | 2128 | TREE_THIS_NOTRAP (gnu_template_reference) = 1; |
a1ab4c31 | 2129 | |
4e6602a8 EB |
2130 | /* Now create the GCC type for each index and add the fields for that |
2131 | index to the template. */ | |
2132 | for (index = (convention_fortran_p ? ndim - 1 : 0), | |
2133 | gnat_index = First_Index (gnat_entity); | |
2134 | 0 <= index && index < ndim; | |
2135 | index += (convention_fortran_p ? - 1 : 1), | |
2136 | gnat_index = Next_Index (gnat_index)) | |
a1ab4c31 | 2137 | { |
4e6602a8 | 2138 | char field_name[16]; |
9a1bdc31 | 2139 | tree gnu_index_type = get_unpadded_type (Etype (gnat_index)); |
825da0d2 EB |
2140 | tree gnu_index_base_type |
2141 | = maybe_character_type (get_base_type (gnu_index_type)); | |
b6c056fe EB |
2142 | tree gnu_lb_field, gnu_hb_field, gnu_orig_min, gnu_orig_max; |
2143 | tree gnu_min, gnu_max, gnu_high; | |
4e6602a8 EB |
2144 | |
2145 | /* Make the FIELD_DECLs for the low and high bounds of this | |
2146 | type and then make extractions of these fields from the | |
a1ab4c31 AC |
2147 | template. */ |
2148 | sprintf (field_name, "LB%d", index); | |
b6c056fe EB |
2149 | gnu_lb_field = create_field_decl (get_identifier (field_name), |
2150 | gnu_index_base_type, | |
da01bfee EB |
2151 | gnu_template_type, NULL_TREE, |
2152 | NULL_TREE, 0, 0); | |
a1ab4c31 | 2153 | Sloc_to_locus (Sloc (gnat_entity), |
b6c056fe | 2154 | &DECL_SOURCE_LOCATION (gnu_lb_field)); |
4e6602a8 EB |
2155 | |
2156 | field_name[0] = 'U'; | |
b6c056fe EB |
2157 | gnu_hb_field = create_field_decl (get_identifier (field_name), |
2158 | gnu_index_base_type, | |
da01bfee EB |
2159 | gnu_template_type, NULL_TREE, |
2160 | NULL_TREE, 0, 0); | |
a1ab4c31 | 2161 | Sloc_to_locus (Sloc (gnat_entity), |
b6c056fe | 2162 | &DECL_SOURCE_LOCATION (gnu_hb_field)); |
a1ab4c31 | 2163 | |
b6c056fe | 2164 | gnu_temp_fields[index] = chainon (gnu_lb_field, gnu_hb_field); |
4e6602a8 EB |
2165 | |
2166 | /* We can't use build_component_ref here since the template type | |
2167 | isn't complete yet. */ | |
b6c056fe EB |
2168 | gnu_orig_min = build3 (COMPONENT_REF, gnu_index_base_type, |
2169 | gnu_template_reference, gnu_lb_field, | |
2170 | NULL_TREE); | |
2171 | gnu_orig_max = build3 (COMPONENT_REF, gnu_index_base_type, | |
2172 | gnu_template_reference, gnu_hb_field, | |
2173 | NULL_TREE); | |
2174 | TREE_READONLY (gnu_orig_min) = TREE_READONLY (gnu_orig_max) = 1; | |
2175 | ||
2176 | gnu_min = convert (sizetype, gnu_orig_min); | |
2177 | gnu_max = convert (sizetype, gnu_orig_max); | |
2178 | ||
2179 | /* Compute the size of this dimension. See the E_Array_Subtype | |
2180 | case below for the rationale. */ | |
2181 | gnu_high | |
2182 | = build3 (COND_EXPR, sizetype, | |
2183 | build2 (GE_EXPR, boolean_type_node, | |
2184 | gnu_orig_max, gnu_orig_min), | |
2185 | gnu_max, | |
2186 | size_binop (MINUS_EXPR, gnu_min, size_one_node)); | |
03b6f8a2 | 2187 | |
4e6602a8 | 2188 | /* Make a range type with the new range in the Ada base type. |
03b6f8a2 | 2189 | Then make an index type with the size range in sizetype. */ |
a1ab4c31 | 2190 | gnu_index_types[index] |
b6c056fe | 2191 | = create_index_type (gnu_min, gnu_high, |
4e6602a8 | 2192 | create_range_type (gnu_index_base_type, |
b6c056fe EB |
2193 | gnu_orig_min, |
2194 | gnu_orig_max), | |
a1ab4c31 | 2195 | gnat_entity); |
4e6602a8 EB |
2196 | |
2197 | /* Update the maximum size of the array in elements. */ | |
2198 | if (gnu_max_size) | |
2199 | { | |
4e6602a8 EB |
2200 | tree gnu_min |
2201 | = convert (sizetype, TYPE_MIN_VALUE (gnu_index_type)); | |
2202 | tree gnu_max | |
2203 | = convert (sizetype, TYPE_MAX_VALUE (gnu_index_type)); | |
2204 | tree gnu_this_max | |
33ccc536 EB |
2205 | = size_binop (PLUS_EXPR, size_one_node, |
2206 | size_binop (MINUS_EXPR, gnu_max, gnu_min)); | |
4e6602a8 EB |
2207 | |
2208 | if (TREE_CODE (gnu_this_max) == INTEGER_CST | |
2209 | && TREE_OVERFLOW (gnu_this_max)) | |
2210 | gnu_max_size = NULL_TREE; | |
2211 | else | |
2212 | gnu_max_size | |
2213 | = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max); | |
2214 | } | |
a1ab4c31 AC |
2215 | |
2216 | TYPE_NAME (gnu_index_types[index]) | |
2217 | = create_concat_name (gnat_entity, field_name); | |
2218 | } | |
2219 | ||
e3edbd56 EB |
2220 | /* Install all the fields into the template. */ |
2221 | TYPE_NAME (gnu_template_type) | |
2222 | = create_concat_name (gnat_entity, "XUB"); | |
2223 | gnu_template_fields = NULL_TREE; | |
a1ab4c31 AC |
2224 | for (index = 0; index < ndim; index++) |
2225 | gnu_template_fields | |
2226 | = chainon (gnu_template_fields, gnu_temp_fields[index]); | |
032d1b71 EB |
2227 | finish_record_type (gnu_template_type, gnu_template_fields, 0, |
2228 | debug_info_p); | |
a1ab4c31 AC |
2229 | TYPE_READONLY (gnu_template_type) = 1; |
2230 | ||
a1ab4c31 AC |
2231 | /* If Component_Size is not already specified, annotate it with the |
2232 | size of the component. */ | |
2233 | if (Unknown_Component_Size (gnat_entity)) | |
9aa04cc7 AC |
2234 | Set_Component_Size (gnat_entity, |
2235 | annotate_value (TYPE_SIZE (comp_type))); | |
a1ab4c31 | 2236 | |
4e6602a8 EB |
2237 | /* Compute the maximum size of the array in units and bits. */ |
2238 | if (gnu_max_size) | |
2239 | { | |
2240 | gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size, | |
9aa04cc7 | 2241 | TYPE_SIZE_UNIT (comp_type)); |
4e6602a8 EB |
2242 | gnu_max_size = size_binop (MULT_EXPR, |
2243 | convert (bitsizetype, gnu_max_size), | |
9aa04cc7 | 2244 | TYPE_SIZE (comp_type)); |
4e6602a8 EB |
2245 | } |
2246 | else | |
2247 | gnu_max_size_unit = NULL_TREE; | |
a1ab4c31 | 2248 | |
4e6602a8 | 2249 | /* Now build the array type. */ |
9aa04cc7 | 2250 | tem = comp_type; |
a1ab4c31 AC |
2251 | for (index = ndim - 1; index >= 0; index--) |
2252 | { | |
523e82a7 | 2253 | tem = build_nonshared_array_type (tem, gnu_index_types[index]); |
ee45a32d EB |
2254 | if (index == ndim - 1) |
2255 | TYPE_REVERSE_STORAGE_ORDER (tem) | |
2256 | = Reverse_Storage_Order (gnat_entity); | |
a1ab4c31 | 2257 | TYPE_MULTI_ARRAY_P (tem) = (index > 0); |
d8e94f79 | 2258 | if (array_type_has_nonaliased_component (tem, gnat_entity)) |
a1ab4c31 AC |
2259 | TYPE_NONALIASED_COMPONENT (tem) = 1; |
2260 | } | |
2261 | ||
feec4372 EB |
2262 | /* If an alignment is specified, use it if valid. But ignore it |
2263 | for the original type of packed array types. If the alignment | |
2264 | was requested with an explicit alignment clause, state so. */ | |
1a4cb227 | 2265 | if (No (Packed_Array_Impl_Type (gnat_entity)) |
a1ab4c31 AC |
2266 | && Known_Alignment (gnat_entity)) |
2267 | { | |
fe37c7af MM |
2268 | SET_TYPE_ALIGN (tem, |
2269 | validate_alignment (Alignment (gnat_entity), | |
2270 | gnat_entity, | |
2271 | TYPE_ALIGN (tem))); | |
a1ab4c31 AC |
2272 | if (Present (Alignment_Clause (gnat_entity))) |
2273 | TYPE_USER_ALIGN (tem) = 1; | |
2274 | } | |
2275 | ||
4e6602a8 | 2276 | TYPE_CONVENTION_FORTRAN_P (tem) = convention_fortran_p; |
e3edbd56 | 2277 | |
2d595887 PMR |
2278 | /* Tag top-level ARRAY_TYPE nodes for packed arrays and their |
2279 | implementation types as such so that the debug information back-end | |
2280 | can output the appropriate description for them. */ | |
2281 | TYPE_PACKED (tem) | |
2282 | = (Is_Packed (gnat_entity) | |
2283 | || Is_Packed_Array_Impl_Type (gnat_entity)); | |
2284 | ||
f797c2b7 EB |
2285 | if (Treat_As_Volatile (gnat_entity)) |
2286 | tem = change_qualified_type (tem, TYPE_QUAL_VOLATILE); | |
2287 | ||
e3edbd56 EB |
2288 | /* Adjust the type of the pointer-to-array field of the fat pointer |
2289 | and record the aliasing relationships if necessary. */ | |
a1ab4c31 | 2290 | TREE_TYPE (TYPE_FIELDS (gnu_fat_type)) = build_pointer_type (tem); |
e3edbd56 EB |
2291 | if (TYPE_ALIAS_SET_KNOWN_P (gnu_fat_type)) |
2292 | record_component_aliases (gnu_fat_type); | |
a1ab4c31 AC |
2293 | |
2294 | /* The result type is an UNCONSTRAINED_ARRAY_TYPE that indicates the | |
2295 | corresponding fat pointer. */ | |
e3edbd56 EB |
2296 | TREE_TYPE (gnu_type) = gnu_fat_type; |
2297 | TYPE_POINTER_TO (gnu_type) = gnu_fat_type; | |
2298 | TYPE_REFERENCE_TO (gnu_type) = gnu_fat_type; | |
6f9f0ce3 | 2299 | SET_TYPE_MODE (gnu_type, BLKmode); |
fe37c7af | 2300 | SET_TYPE_ALIGN (gnu_type, TYPE_ALIGN (tem)); |
a1ab4c31 AC |
2301 | |
2302 | /* If the maximum size doesn't overflow, use it. */ | |
86060344 | 2303 | if (gnu_max_size |
4e6602a8 EB |
2304 | && TREE_CODE (gnu_max_size) == INTEGER_CST |
2305 | && !TREE_OVERFLOW (gnu_max_size) | |
2306 | && TREE_CODE (gnu_max_size_unit) == INTEGER_CST | |
a1ab4c31 | 2307 | && !TREE_OVERFLOW (gnu_max_size_unit)) |
4e6602a8 EB |
2308 | { |
2309 | TYPE_SIZE (tem) = size_binop (MIN_EXPR, gnu_max_size, | |
2310 | TYPE_SIZE (tem)); | |
2311 | TYPE_SIZE_UNIT (tem) = size_binop (MIN_EXPR, gnu_max_size_unit, | |
2312 | TYPE_SIZE_UNIT (tem)); | |
2313 | } | |
a1ab4c31 | 2314 | |
74746d49 | 2315 | create_type_decl (create_concat_name (gnat_entity, "XUA"), tem, |
c1a569ef | 2316 | artificial_p, debug_info_p, gnat_entity); |
a1ab4c31 | 2317 | |
24bd3c6e PMR |
2318 | /* If told to generate GNAT encodings for them (GDB rely on them at the |
2319 | moment): give the fat pointer type a name. If this is a packed | |
2320 | array, tell the debugger how to interpret the underlying bits. */ | |
1a4cb227 AC |
2321 | if (Present (Packed_Array_Impl_Type (gnat_entity))) |
2322 | gnat_name = Packed_Array_Impl_Type (gnat_entity); | |
40c88b94 EB |
2323 | else |
2324 | gnat_name = gnat_entity; | |
24bd3c6e PMR |
2325 | if (gnat_encodings != DWARF_GNAT_ENCODINGS_MINIMAL) |
2326 | gnu_entity_name = create_concat_name (gnat_name, "XUP"); | |
2327 | create_type_decl (gnu_entity_name, gnu_fat_type, artificial_p, | |
2328 | debug_info_p, gnat_entity); | |
a1ab4c31 | 2329 | |
2b45154d EB |
2330 | /* Create the type to be designated by thin pointers: a record type for |
2331 | the array and its template. We used to shift the fields to have the | |
2332 | template at a negative offset, but this was somewhat of a kludge; we | |
2333 | now shift thin pointer values explicitly but only those which have a | |
24bd3c6e PMR |
2334 | TYPE_UNCONSTRAINED_ARRAY attached to the designated RECORD_TYPE. |
2335 | Note that GDB can handle standard DWARF information for them, so we | |
2336 | don't have to name them as a GNAT encoding, except if specifically | |
2337 | asked to. */ | |
2338 | if (gnat_encodings != DWARF_GNAT_ENCODINGS_MINIMAL) | |
2339 | gnu_entity_name = create_concat_name (gnat_name, "XUT"); | |
2340 | else | |
2341 | gnu_entity_name = get_entity_name (gnat_name); | |
2342 | tem = build_unc_object_type (gnu_template_type, tem, gnu_entity_name, | |
928dfa4b | 2343 | debug_info_p); |
a1ab4c31 AC |
2344 | |
2345 | SET_TYPE_UNCONSTRAINED_ARRAY (tem, gnu_type); | |
2346 | TYPE_OBJECT_RECORD_TYPE (gnu_type) = tem; | |
a1ab4c31 AC |
2347 | } |
2348 | break; | |
2349 | ||
a1ab4c31 AC |
2350 | case E_Array_Subtype: |
2351 | ||
2352 | /* This is the actual data type for array variables. Multidimensional | |
4e6602a8 | 2353 | arrays are implemented as arrays of arrays. Note that arrays which |
7c20033e | 2354 | have sparse enumeration subtypes as index components create sparse |
4e6602a8 EB |
2355 | arrays, which is obviously space inefficient but so much easier to |
2356 | code for now. | |
a1ab4c31 | 2357 | |
4e6602a8 EB |
2358 | Also note that the subtype never refers to the unconstrained array |
2359 | type, which is somewhat at variance with Ada semantics. | |
a1ab4c31 | 2360 | |
4e6602a8 EB |
2361 | First check to see if this is simply a renaming of the array type. |
2362 | If so, the result is the array type. */ | |
a1ab4c31 | 2363 | |
f797c2b7 | 2364 | gnu_type = TYPE_MAIN_VARIANT (gnat_to_gnu_type (Etype (gnat_entity))); |
a1ab4c31 | 2365 | if (!Is_Constrained (gnat_entity)) |
7c20033e | 2366 | ; |
a1ab4c31 AC |
2367 | else |
2368 | { | |
4e6602a8 EB |
2369 | Entity_Id gnat_index, gnat_base_index; |
2370 | const bool convention_fortran_p | |
2371 | = (Convention (gnat_entity) == Convention_Fortran); | |
2372 | const int ndim = Number_Dimensions (gnat_entity); | |
a1ab4c31 | 2373 | tree gnu_base_type = gnu_type; |
2bb1fc26 | 2374 | tree *gnu_index_types = XALLOCAVEC (tree, ndim); |
26383c64 | 2375 | tree gnu_max_size = size_one_node, gnu_max_size_unit; |
a1ab4c31 | 2376 | bool need_index_type_struct = false; |
4e6602a8 | 2377 | int index; |
a1ab4c31 | 2378 | |
4e6602a8 EB |
2379 | /* First create the GCC type for each index and find out whether |
2380 | special types are needed for debugging information. */ | |
2381 | for (index = (convention_fortran_p ? ndim - 1 : 0), | |
2382 | gnat_index = First_Index (gnat_entity), | |
2383 | gnat_base_index | |
a1ab4c31 | 2384 | = First_Index (Implementation_Base_Type (gnat_entity)); |
4e6602a8 EB |
2385 | 0 <= index && index < ndim; |
2386 | index += (convention_fortran_p ? - 1 : 1), | |
2387 | gnat_index = Next_Index (gnat_index), | |
2388 | gnat_base_index = Next_Index (gnat_base_index)) | |
a1ab4c31 | 2389 | { |
4e6602a8 | 2390 | tree gnu_index_type = get_unpadded_type (Etype (gnat_index)); |
825da0d2 EB |
2391 | tree gnu_index_base_type |
2392 | = maybe_character_type (get_base_type (gnu_index_type)); | |
1eb58520 AC |
2393 | tree gnu_orig_min |
2394 | = convert (gnu_index_base_type, | |
2395 | TYPE_MIN_VALUE (gnu_index_type)); | |
2396 | tree gnu_orig_max | |
2397 | = convert (gnu_index_base_type, | |
2398 | TYPE_MAX_VALUE (gnu_index_type)); | |
4e6602a8 EB |
2399 | tree gnu_min = convert (sizetype, gnu_orig_min); |
2400 | tree gnu_max = convert (sizetype, gnu_orig_max); | |
2401 | tree gnu_base_index_type | |
2402 | = get_unpadded_type (Etype (gnat_base_index)); | |
1eb58520 | 2403 | tree gnu_base_index_base_type |
825da0d2 | 2404 | = maybe_character_type (get_base_type (gnu_base_index_type)); |
1eb58520 AC |
2405 | tree gnu_base_orig_min |
2406 | = convert (gnu_base_index_base_type, | |
2407 | TYPE_MIN_VALUE (gnu_base_index_type)); | |
2408 | tree gnu_base_orig_max | |
2409 | = convert (gnu_base_index_base_type, | |
2410 | TYPE_MAX_VALUE (gnu_base_index_type)); | |
728936bb | 2411 | tree gnu_high; |
4e6602a8 EB |
2412 | |
2413 | /* See if the base array type is already flat. If it is, we | |
2414 | are probably compiling an ACATS test but it will cause the | |
2415 | code below to malfunction if we don't handle it specially. */ | |
2416 | if (TREE_CODE (gnu_base_orig_min) == INTEGER_CST | |
2417 | && TREE_CODE (gnu_base_orig_max) == INTEGER_CST | |
2418 | && tree_int_cst_lt (gnu_base_orig_max, gnu_base_orig_min)) | |
a1ab4c31 | 2419 | { |
4e6602a8 EB |
2420 | gnu_min = size_one_node; |
2421 | gnu_max = size_zero_node; | |
feec4372 | 2422 | gnu_high = gnu_max; |
a1ab4c31 AC |
2423 | } |
2424 | ||
4e6602a8 EB |
2425 | /* Similarly, if one of the values overflows in sizetype and the |
2426 | range is null, use 1..0 for the sizetype bounds. */ | |
728936bb | 2427 | else if (TREE_CODE (gnu_min) == INTEGER_CST |
a1ab4c31 AC |
2428 | && TREE_CODE (gnu_max) == INTEGER_CST |
2429 | && (TREE_OVERFLOW (gnu_min) || TREE_OVERFLOW (gnu_max)) | |
4e6602a8 | 2430 | && tree_int_cst_lt (gnu_orig_max, gnu_orig_min)) |
feec4372 EB |
2431 | { |
2432 | gnu_min = size_one_node; | |
2433 | gnu_max = size_zero_node; | |
2434 | gnu_high = gnu_max; | |
2435 | } | |
a1ab4c31 | 2436 | |
4e6602a8 EB |
2437 | /* If the minimum and maximum values both overflow in sizetype, |
2438 | but the difference in the original type does not overflow in | |
2439 | sizetype, ignore the overflow indication. */ | |
728936bb | 2440 | else if (TREE_CODE (gnu_min) == INTEGER_CST |
4e6602a8 EB |
2441 | && TREE_CODE (gnu_max) == INTEGER_CST |
2442 | && TREE_OVERFLOW (gnu_min) && TREE_OVERFLOW (gnu_max) | |
2443 | && !TREE_OVERFLOW | |
2444 | (convert (sizetype, | |
2445 | fold_build2 (MINUS_EXPR, gnu_index_type, | |
2446 | gnu_orig_max, | |
2447 | gnu_orig_min)))) | |
feec4372 | 2448 | { |
4e6602a8 EB |
2449 | TREE_OVERFLOW (gnu_min) = 0; |
2450 | TREE_OVERFLOW (gnu_max) = 0; | |
feec4372 EB |
2451 | gnu_high = gnu_max; |
2452 | } | |
2453 | ||
f45f9664 EB |
2454 | /* Compute the size of this dimension in the general case. We |
2455 | need to provide GCC with an upper bound to use but have to | |
2456 | deal with the "superflat" case. There are three ways to do | |
2457 | this. If we can prove that the array can never be superflat, | |
2458 | we can just use the high bound of the index type. */ | |
728936bb | 2459 | else if ((Nkind (gnat_index) == N_Range |
fc7a823e | 2460 | && cannot_be_superflat (gnat_index)) |
53f3f4e3 | 2461 | /* Bit-Packed Array Impl. Types are never superflat. */ |
1a4cb227 | 2462 | || (Is_Packed_Array_Impl_Type (gnat_entity) |
f9d7d7c1 EB |
2463 | && Is_Bit_Packed_Array |
2464 | (Original_Array_Type (gnat_entity)))) | |
f45f9664 EB |
2465 | gnu_high = gnu_max; |
2466 | ||
728936bb EB |
2467 | /* Otherwise, if the high bound is constant but the low bound is |
2468 | not, we use the expression (hb >= lb) ? lb : hb + 1 for the | |
2469 | lower bound. Note that the comparison must be done in the | |
2470 | original type to avoid any overflow during the conversion. */ | |
2471 | else if (TREE_CODE (gnu_max) == INTEGER_CST | |
2472 | && TREE_CODE (gnu_min) != INTEGER_CST) | |
feec4372 | 2473 | { |
728936bb EB |
2474 | gnu_high = gnu_max; |
2475 | gnu_min | |
2476 | = build_cond_expr (sizetype, | |
2477 | build_binary_op (GE_EXPR, | |
2478 | boolean_type_node, | |
2479 | gnu_orig_max, | |
2480 | gnu_orig_min), | |
2481 | gnu_min, | |
dcbac1a4 EB |
2482 | int_const_binop (PLUS_EXPR, gnu_max, |
2483 | size_one_node)); | |
feec4372 | 2484 | } |
a1ab4c31 | 2485 | |
728936bb EB |
2486 | /* Finally we use (hb >= lb) ? hb : lb - 1 for the upper bound |
2487 | in all the other cases. Note that, here as well as above, | |
2488 | the condition used in the comparison must be equivalent to | |
2489 | the condition (length != 0). This is relied upon in order | |
dcbac1a4 EB |
2490 | to optimize array comparisons in compare_arrays. Moreover |
2491 | we use int_const_binop for the shift by 1 if the bound is | |
2492 | constant to avoid any unwanted overflow. */ | |
728936bb EB |
2493 | else |
2494 | gnu_high | |
2495 | = build_cond_expr (sizetype, | |
2496 | build_binary_op (GE_EXPR, | |
2497 | boolean_type_node, | |
2498 | gnu_orig_max, | |
2499 | gnu_orig_min), | |
2500 | gnu_max, | |
dcbac1a4 EB |
2501 | TREE_CODE (gnu_min) == INTEGER_CST |
2502 | ? int_const_binop (MINUS_EXPR, gnu_min, | |
2503 | size_one_node) | |
2504 | : size_binop (MINUS_EXPR, gnu_min, | |
2505 | size_one_node)); | |
728936bb | 2506 | |
b6c056fe EB |
2507 | /* Reuse the index type for the range type. Then make an index |
2508 | type with the size range in sizetype. */ | |
4e6602a8 EB |
2509 | gnu_index_types[index] |
2510 | = create_index_type (gnu_min, gnu_high, gnu_index_type, | |
a1ab4c31 AC |
2511 | gnat_entity); |
2512 | ||
4e6602a8 | 2513 | /* Update the maximum size of the array in elements. Here we |
a1ab4c31 | 2514 | see if any constraint on the index type of the base type |
4e6602a8 EB |
2515 | can be used in the case of self-referential bound on the |
2516 | index type of the subtype. We look for a non-"infinite" | |
a1ab4c31 AC |
2517 | and non-self-referential bound from any type involved and |
2518 | handle each bound separately. */ | |
4e6602a8 EB |
2519 | if (gnu_max_size) |
2520 | { | |
2521 | tree gnu_base_min = convert (sizetype, gnu_base_orig_min); | |
2522 | tree gnu_base_max = convert (sizetype, gnu_base_orig_max); | |
4e6602a8 EB |
2523 | tree gnu_base_base_min |
2524 | = convert (sizetype, | |
2525 | TYPE_MIN_VALUE (gnu_base_index_base_type)); | |
2526 | tree gnu_base_base_max | |
2527 | = convert (sizetype, | |
2528 | TYPE_MAX_VALUE (gnu_base_index_base_type)); | |
2529 | ||
2530 | if (!CONTAINS_PLACEHOLDER_P (gnu_min) | |
2531 | || !(TREE_CODE (gnu_base_min) == INTEGER_CST | |
2532 | && !TREE_OVERFLOW (gnu_base_min))) | |
2533 | gnu_base_min = gnu_min; | |
2534 | ||
2535 | if (!CONTAINS_PLACEHOLDER_P (gnu_max) | |
2536 | || !(TREE_CODE (gnu_base_max) == INTEGER_CST | |
2537 | && !TREE_OVERFLOW (gnu_base_max))) | |
2538 | gnu_base_max = gnu_max; | |
2539 | ||
2540 | if ((TREE_CODE (gnu_base_min) == INTEGER_CST | |
2541 | && TREE_OVERFLOW (gnu_base_min)) | |
2542 | || operand_equal_p (gnu_base_min, gnu_base_base_min, 0) | |
2543 | || (TREE_CODE (gnu_base_max) == INTEGER_CST | |
2544 | && TREE_OVERFLOW (gnu_base_max)) | |
2545 | || operand_equal_p (gnu_base_max, gnu_base_base_max, 0)) | |
2546 | gnu_max_size = NULL_TREE; | |
2547 | else | |
2548 | { | |
33ccc536 EB |
2549 | tree gnu_this_max; |
2550 | ||
2551 | /* Use int_const_binop if the bounds are constant to | |
2552 | avoid any unwanted overflow. */ | |
2553 | if (TREE_CODE (gnu_base_min) == INTEGER_CST | |
2554 | && TREE_CODE (gnu_base_max) == INTEGER_CST) | |
2555 | gnu_this_max | |
2556 | = int_const_binop (PLUS_EXPR, size_one_node, | |
2557 | int_const_binop (MINUS_EXPR, | |
4e6602a8 | 2558 | gnu_base_max, |
33ccc536 | 2559 | gnu_base_min)); |
4e6602a8 | 2560 | else |
33ccc536 EB |
2561 | gnu_this_max |
2562 | = size_binop (PLUS_EXPR, size_one_node, | |
2563 | size_binop (MINUS_EXPR, | |
2564 | gnu_base_max, | |
2565 | gnu_base_min)); | |
2566 | ||
2567 | gnu_max_size | |
2568 | = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max); | |
4e6602a8 EB |
2569 | } |
2570 | } | |
a1ab4c31 | 2571 | |
4e6602a8 EB |
2572 | /* We need special types for debugging information to point to |
2573 | the index types if they have variable bounds, are not integer | |
24bd3c6e PMR |
2574 | types, are biased or are wider than sizetype. These are GNAT |
2575 | encodings, so we have to include them only when all encodings | |
2576 | are requested. */ | |
7c775aca EB |
2577 | if ((TREE_CODE (gnu_orig_min) != INTEGER_CST |
2578 | || TREE_CODE (gnu_orig_max) != INTEGER_CST | |
2579 | || TREE_CODE (gnu_index_type) != INTEGER_TYPE | |
2580 | || (TREE_TYPE (gnu_index_type) | |
2581 | && TREE_CODE (TREE_TYPE (gnu_index_type)) | |
2582 | != INTEGER_TYPE) | |
2583 | || TYPE_BIASED_REPRESENTATION_P (gnu_index_type)) | |
2584 | && gnat_encodings != DWARF_GNAT_ENCODINGS_MINIMAL) | |
a1ab4c31 AC |
2585 | need_index_type_struct = true; |
2586 | } | |
2587 | ||
2588 | /* Then flatten: create the array of arrays. For an array type | |
2589 | used to implement a packed array, get the component type from | |
2590 | the original array type since the representation clauses that | |
2591 | can affect it are on the latter. */ | |
1a4cb227 | 2592 | if (Is_Packed_Array_Impl_Type (gnat_entity) |
a1ab4c31 AC |
2593 | && !Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))) |
2594 | { | |
2595 | gnu_type = gnat_to_gnu_type (Original_Array_Type (gnat_entity)); | |
4e6602a8 | 2596 | for (index = ndim - 1; index >= 0; index--) |
a1ab4c31 AC |
2597 | gnu_type = TREE_TYPE (gnu_type); |
2598 | ||
2599 | /* One of the above calls might have caused us to be elaborated, | |
2600 | so don't blow up if so. */ | |
2601 | if (present_gnu_tree (gnat_entity)) | |
2602 | { | |
2603 | maybe_present = true; | |
2604 | break; | |
2605 | } | |
2606 | } | |
2607 | else | |
2608 | { | |
2cac6017 EB |
2609 | gnu_type = gnat_to_gnu_component_type (gnat_entity, definition, |
2610 | debug_info_p); | |
a1ab4c31 AC |
2611 | |
2612 | /* One of the above calls might have caused us to be elaborated, | |
2613 | so don't blow up if so. */ | |
2614 | if (present_gnu_tree (gnat_entity)) | |
2615 | { | |
2616 | maybe_present = true; | |
2617 | break; | |
2618 | } | |
a1ab4c31 AC |
2619 | } |
2620 | ||
4e6602a8 EB |
2621 | /* Compute the maximum size of the array in units and bits. */ |
2622 | if (gnu_max_size) | |
2623 | { | |
2624 | gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size, | |
2625 | TYPE_SIZE_UNIT (gnu_type)); | |
2626 | gnu_max_size = size_binop (MULT_EXPR, | |
2627 | convert (bitsizetype, gnu_max_size), | |
2628 | TYPE_SIZE (gnu_type)); | |
2629 | } | |
2630 | else | |
2631 | gnu_max_size_unit = NULL_TREE; | |
a1ab4c31 | 2632 | |
4e6602a8 EB |
2633 | /* Now build the array type. */ |
2634 | for (index = ndim - 1; index >= 0; index --) | |
a1ab4c31 | 2635 | { |
523e82a7 EB |
2636 | gnu_type = build_nonshared_array_type (gnu_type, |
2637 | gnu_index_types[index]); | |
ee45a32d EB |
2638 | if (index == ndim - 1) |
2639 | TYPE_REVERSE_STORAGE_ORDER (gnu_type) | |
2640 | = Reverse_Storage_Order (gnat_entity); | |
a1ab4c31 | 2641 | TYPE_MULTI_ARRAY_P (gnu_type) = (index > 0); |
d8e94f79 | 2642 | if (array_type_has_nonaliased_component (gnu_type, gnat_entity)) |
a1ab4c31 AC |
2643 | TYPE_NONALIASED_COMPONENT (gnu_type) = 1; |
2644 | } | |
2645 | ||
2d595887 | 2646 | /* Strip the ___XP suffix for standard DWARF. */ |
7c775aca EB |
2647 | if (Is_Packed_Array_Impl_Type (gnat_entity) |
2648 | && gnat_encodings == DWARF_GNAT_ENCODINGS_MINIMAL) | |
2d595887 PMR |
2649 | { |
2650 | Entity_Id gnat_original_array_type | |
2651 | = Underlying_Type (Original_Array_Type (gnat_entity)); | |
2652 | ||
2653 | gnu_entity_name | |
2654 | = get_entity_name (gnat_original_array_type); | |
2655 | } | |
2656 | ||
10069d53 | 2657 | /* Attach the TYPE_STUB_DECL in case we have a parallel type. */ |
4fd78fe6 EB |
2658 | TYPE_STUB_DECL (gnu_type) |
2659 | = create_type_stub_decl (gnu_entity_name, gnu_type); | |
10069d53 | 2660 | |
4e6602a8 EB |
2661 | /* If we are at file level and this is a multi-dimensional array, |
2662 | we need to make a variable corresponding to the stride of the | |
a1ab4c31 | 2663 | inner dimensions. */ |
4e6602a8 | 2664 | if (global_bindings_p () && ndim > 1) |
a1ab4c31 | 2665 | { |
a1ab4c31 AC |
2666 | tree gnu_arr_type; |
2667 | ||
bf44701f | 2668 | for (gnu_arr_type = TREE_TYPE (gnu_type), index = 1; |
a1ab4c31 | 2669 | TREE_CODE (gnu_arr_type) == ARRAY_TYPE; |
bf44701f | 2670 | gnu_arr_type = TREE_TYPE (gnu_arr_type), index++) |
a1ab4c31 AC |
2671 | { |
2672 | tree eltype = TREE_TYPE (gnu_arr_type); | |
bf44701f | 2673 | char stride_name[32]; |
a1ab4c31 | 2674 | |
bf44701f | 2675 | sprintf (stride_name, "ST%d", index); |
a1ab4c31 | 2676 | TYPE_SIZE (gnu_arr_type) |
a531043b | 2677 | = elaborate_expression_1 (TYPE_SIZE (gnu_arr_type), |
bf44701f | 2678 | gnat_entity, stride_name, |
a531043b | 2679 | definition, false); |
a1ab4c31 AC |
2680 | |
2681 | /* ??? For now, store the size as a multiple of the | |
2682 | alignment of the element type in bytes so that we | |
2683 | can see the alignment from the tree. */ | |
bf44701f | 2684 | sprintf (stride_name, "ST%d_A_UNIT", index); |
a1ab4c31 | 2685 | TYPE_SIZE_UNIT (gnu_arr_type) |
da01bfee | 2686 | = elaborate_expression_2 (TYPE_SIZE_UNIT (gnu_arr_type), |
bf44701f | 2687 | gnat_entity, stride_name, |
da01bfee EB |
2688 | definition, false, |
2689 | TYPE_ALIGN (eltype)); | |
a1ab4c31 AC |
2690 | |
2691 | /* ??? create_type_decl is not invoked on the inner types so | |
2692 | the MULT_EXPR node built above will never be marked. */ | |
3f13dd77 | 2693 | MARK_VISITED (TYPE_SIZE_UNIT (gnu_arr_type)); |
a1ab4c31 AC |
2694 | } |
2695 | } | |
2696 | ||
4fd78fe6 EB |
2697 | /* If we need to write out a record type giving the names of the |
2698 | bounds for debugging purposes, do it now and make the record | |
2699 | type a parallel type. This is not needed for a packed array | |
2700 | since the bounds are conveyed by the original array type. */ | |
2701 | if (need_index_type_struct | |
2702 | && debug_info_p | |
1a4cb227 | 2703 | && !Is_Packed_Array_Impl_Type (gnat_entity)) |
a1ab4c31 | 2704 | { |
10069d53 | 2705 | tree gnu_bound_rec = make_node (RECORD_TYPE); |
a1ab4c31 AC |
2706 | tree gnu_field_list = NULL_TREE; |
2707 | tree gnu_field; | |
2708 | ||
10069d53 | 2709 | TYPE_NAME (gnu_bound_rec) |
a1ab4c31 AC |
2710 | = create_concat_name (gnat_entity, "XA"); |
2711 | ||
4e6602a8 | 2712 | for (index = ndim - 1; index >= 0; index--) |
a1ab4c31 | 2713 | { |
4e6602a8 | 2714 | tree gnu_index = TYPE_INDEX_TYPE (gnu_index_types[index]); |
9dba4b55 | 2715 | tree gnu_index_name = TYPE_IDENTIFIER (gnu_index); |
a1ab4c31 | 2716 | |
4fd78fe6 EB |
2717 | /* Make sure to reference the types themselves, and not just |
2718 | their names, as the debugger may fall back on them. */ | |
10069d53 | 2719 | gnu_field = create_field_decl (gnu_index_name, gnu_index, |
da01bfee EB |
2720 | gnu_bound_rec, NULL_TREE, |
2721 | NULL_TREE, 0, 0); | |
910ad8de | 2722 | DECL_CHAIN (gnu_field) = gnu_field_list; |
a1ab4c31 AC |
2723 | gnu_field_list = gnu_field; |
2724 | } | |
2725 | ||
032d1b71 | 2726 | finish_record_type (gnu_bound_rec, gnu_field_list, 0, true); |
a5695aa2 | 2727 | add_parallel_type (gnu_type, gnu_bound_rec); |
a1ab4c31 AC |
2728 | } |
2729 | ||
583eb0c9 | 2730 | /* If this is a packed array type, make the original array type a |
2d595887 PMR |
2731 | parallel/debug type. Otherwise, if such GNAT encodings are |
2732 | required, do it for the base array type if it isn't artificial to | |
2733 | make sure it is kept in the debug info. */ | |
583eb0c9 EB |
2734 | if (debug_info_p) |
2735 | { | |
1eb58520 | 2736 | if (Is_Packed_Array_Impl_Type (gnat_entity)) |
2d595887 PMR |
2737 | associate_original_type_to_packed_array (gnu_type, |
2738 | gnat_entity); | |
583eb0c9 EB |
2739 | else |
2740 | { | |
2741 | tree gnu_base_decl | |
2742 | = gnat_to_gnu_entity (Etype (gnat_entity), NULL_TREE, 0); | |
7c775aca EB |
2743 | if (!DECL_ARTIFICIAL (gnu_base_decl) |
2744 | && gnat_encodings != DWARF_GNAT_ENCODINGS_MINIMAL) | |
a5695aa2 | 2745 | add_parallel_type (gnu_type, |
583eb0c9 EB |
2746 | TREE_TYPE (TREE_TYPE (gnu_base_decl))); |
2747 | } | |
2748 | } | |
4fd78fe6 | 2749 | |
4e6602a8 | 2750 | TYPE_CONVENTION_FORTRAN_P (gnu_type) = convention_fortran_p; |
a1ab4c31 | 2751 | TYPE_PACKED_ARRAY_TYPE_P (gnu_type) |
1a4cb227 | 2752 | = (Is_Packed_Array_Impl_Type (gnat_entity) |
a1ab4c31 AC |
2753 | && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))); |
2754 | ||
2d595887 PMR |
2755 | /* Tag top-level ARRAY_TYPE nodes for packed arrays and their |
2756 | implementation types as such so that the debug information back-end | |
2757 | can output the appropriate description for them. */ | |
2758 | TYPE_PACKED (gnu_type) | |
2759 | = (Is_Packed (gnat_entity) | |
2760 | || Is_Packed_Array_Impl_Type (gnat_entity)); | |
2761 | ||
4e6602a8 | 2762 | /* If the size is self-referential and the maximum size doesn't |
a1ab4c31 AC |
2763 | overflow, use it. */ |
2764 | if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)) | |
4e6602a8 | 2765 | && gnu_max_size |
a1ab4c31 AC |
2766 | && !(TREE_CODE (gnu_max_size) == INTEGER_CST |
2767 | && TREE_OVERFLOW (gnu_max_size)) | |
2768 | && !(TREE_CODE (gnu_max_size_unit) == INTEGER_CST | |
4e6602a8 | 2769 | && TREE_OVERFLOW (gnu_max_size_unit))) |
a1ab4c31 AC |
2770 | { |
2771 | TYPE_SIZE (gnu_type) = size_binop (MIN_EXPR, gnu_max_size, | |
2772 | TYPE_SIZE (gnu_type)); | |
2773 | TYPE_SIZE_UNIT (gnu_type) | |
2774 | = size_binop (MIN_EXPR, gnu_max_size_unit, | |
2775 | TYPE_SIZE_UNIT (gnu_type)); | |
2776 | } | |
2777 | ||
2778 | /* Set our alias set to that of our base type. This gives all | |
2779 | array subtypes the same alias set. */ | |
794511d2 | 2780 | relate_alias_sets (gnu_type, gnu_base_type, ALIAS_SET_COPY); |
a1ab4c31 | 2781 | |
7c20033e EB |
2782 | /* If this is a packed type, make this type the same as the packed |
2783 | array type, but do some adjusting in the type first. */ | |
1a4cb227 | 2784 | if (Present (Packed_Array_Impl_Type (gnat_entity))) |
a1ab4c31 | 2785 | { |
7c20033e EB |
2786 | Entity_Id gnat_index; |
2787 | tree gnu_inner; | |
2788 | ||
2789 | /* First finish the type we had been making so that we output | |
2790 | debugging information for it. */ | |
74746d49 | 2791 | process_attributes (&gnu_type, &attr_list, false, gnat_entity); |
7c20033e | 2792 | if (Treat_As_Volatile (gnat_entity)) |
f797c2b7 EB |
2793 | { |
2794 | const int quals | |
2795 | = TYPE_QUAL_VOLATILE | |
2796 | | (Is_Atomic_Or_VFA (gnat_entity) ? TYPE_QUAL_ATOMIC : 0); | |
2797 | gnu_type = change_qualified_type (gnu_type, quals); | |
2798 | } | |
7c20033e EB |
2799 | /* Make it artificial only if the base type was artificial too. |
2800 | That's sort of "morally" true and will make it possible for | |
2801 | the debugger to look it up by name in DWARF, which is needed | |
2802 | in order to decode the packed array type. */ | |
2803 | gnu_decl | |
74746d49 | 2804 | = create_type_decl (gnu_entity_name, gnu_type, |
7c20033e | 2805 | !Comes_From_Source (Etype (gnat_entity)) |
c1a569ef EB |
2806 | && artificial_p, debug_info_p, |
2807 | gnat_entity); | |
7c20033e EB |
2808 | |
2809 | /* Save it as our equivalent in case the call below elaborates | |
2810 | this type again. */ | |
2811 | save_gnu_tree (gnat_entity, gnu_decl, false); | |
2812 | ||
1a4cb227 AC |
2813 | gnu_decl |
2814 | = gnat_to_gnu_entity (Packed_Array_Impl_Type (gnat_entity), | |
2815 | NULL_TREE, 0); | |
7c20033e EB |
2816 | this_made_decl = true; |
2817 | gnu_type = TREE_TYPE (gnu_decl); | |
2d595887 | 2818 | |
7c20033e EB |
2819 | save_gnu_tree (gnat_entity, NULL_TREE, false); |
2820 | ||
2821 | gnu_inner = gnu_type; | |
2822 | while (TREE_CODE (gnu_inner) == RECORD_TYPE | |
2823 | && (TYPE_JUSTIFIED_MODULAR_P (gnu_inner) | |
315cff15 | 2824 | || TYPE_PADDING_P (gnu_inner))) |
7c20033e EB |
2825 | gnu_inner = TREE_TYPE (TYPE_FIELDS (gnu_inner)); |
2826 | ||
2827 | /* We need to attach the index type to the type we just made so | |
2828 | that the actual bounds can later be put into a template. */ | |
2829 | if ((TREE_CODE (gnu_inner) == ARRAY_TYPE | |
2830 | && !TYPE_ACTUAL_BOUNDS (gnu_inner)) | |
2831 | || (TREE_CODE (gnu_inner) == INTEGER_TYPE | |
2832 | && !TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner))) | |
a1ab4c31 | 2833 | { |
7c20033e | 2834 | if (TREE_CODE (gnu_inner) == INTEGER_TYPE) |
a1ab4c31 | 2835 | { |
7c20033e EB |
2836 | /* The TYPE_ACTUAL_BOUNDS field is overloaded with the |
2837 | TYPE_MODULUS for modular types so we make an extra | |
2838 | subtype if necessary. */ | |
2839 | if (TYPE_MODULAR_P (gnu_inner)) | |
2840 | { | |
2841 | tree gnu_subtype | |
2842 | = make_unsigned_type (TYPE_PRECISION (gnu_inner)); | |
2843 | TREE_TYPE (gnu_subtype) = gnu_inner; | |
2844 | TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1; | |
2845 | SET_TYPE_RM_MIN_VALUE (gnu_subtype, | |
2846 | TYPE_MIN_VALUE (gnu_inner)); | |
2847 | SET_TYPE_RM_MAX_VALUE (gnu_subtype, | |
2848 | TYPE_MAX_VALUE (gnu_inner)); | |
2849 | gnu_inner = gnu_subtype; | |
2850 | } | |
2851 | ||
2852 | TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner) = 1; | |
26383c64 | 2853 | |
7c20033e | 2854 | /* Check for other cases of overloading. */ |
9abe8b74 | 2855 | gcc_checking_assert (!TYPE_ACTUAL_BOUNDS (gnu_inner)); |
7c20033e | 2856 | } |
a1ab4c31 | 2857 | |
7c20033e EB |
2858 | for (gnat_index = First_Index (gnat_entity); |
2859 | Present (gnat_index); | |
2860 | gnat_index = Next_Index (gnat_index)) | |
2861 | SET_TYPE_ACTUAL_BOUNDS | |
2862 | (gnu_inner, | |
2863 | tree_cons (NULL_TREE, | |
2864 | get_unpadded_type (Etype (gnat_index)), | |
2865 | TYPE_ACTUAL_BOUNDS (gnu_inner))); | |
2866 | ||
2867 | if (Convention (gnat_entity) != Convention_Fortran) | |
2868 | SET_TYPE_ACTUAL_BOUNDS | |
2869 | (gnu_inner, nreverse (TYPE_ACTUAL_BOUNDS (gnu_inner))); | |
2870 | ||
2871 | if (TREE_CODE (gnu_type) == RECORD_TYPE | |
2872 | && TYPE_JUSTIFIED_MODULAR_P (gnu_type)) | |
2873 | TREE_TYPE (TYPE_FIELDS (gnu_type)) = gnu_inner; | |
2874 | } | |
a1ab4c31 | 2875 | } |
a1ab4c31 | 2876 | |
7c20033e | 2877 | else |
1a4cb227 | 2878 | /* Abort if packed array with no Packed_Array_Impl_Type. */ |
7c20033e EB |
2879 | gcc_assert (!Is_Packed (gnat_entity)); |
2880 | } | |
a1ab4c31 AC |
2881 | break; |
2882 | ||
2883 | case E_String_Literal_Subtype: | |
2ddc34ba | 2884 | /* Create the type for a string literal. */ |
a1ab4c31 AC |
2885 | { |
2886 | Entity_Id gnat_full_type | |
2887 | = (IN (Ekind (Etype (gnat_entity)), Private_Kind) | |
2888 | && Present (Full_View (Etype (gnat_entity))) | |
2889 | ? Full_View (Etype (gnat_entity)) : Etype (gnat_entity)); | |
2890 | tree gnu_string_type = get_unpadded_type (gnat_full_type); | |
2891 | tree gnu_string_array_type | |
2892 | = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_string_type)))); | |
2893 | tree gnu_string_index_type | |
2894 | = get_base_type (TREE_TYPE (TYPE_INDEX_TYPE | |
2895 | (TYPE_DOMAIN (gnu_string_array_type)))); | |
2896 | tree gnu_lower_bound | |
2897 | = convert (gnu_string_index_type, | |
2898 | gnat_to_gnu (String_Literal_Low_Bound (gnat_entity))); | |
f54ee980 EB |
2899 | tree gnu_length |
2900 | = UI_To_gnu (String_Literal_Length (gnat_entity), | |
2901 | gnu_string_index_type); | |
a1ab4c31 AC |
2902 | tree gnu_upper_bound |
2903 | = build_binary_op (PLUS_EXPR, gnu_string_index_type, | |
2904 | gnu_lower_bound, | |
f54ee980 | 2905 | int_const_binop (MINUS_EXPR, gnu_length, |
8b9aec86 RS |
2906 | convert (gnu_string_index_type, |
2907 | integer_one_node))); | |
a1ab4c31 | 2908 | tree gnu_index_type |
c1abd261 EB |
2909 | = create_index_type (convert (sizetype, gnu_lower_bound), |
2910 | convert (sizetype, gnu_upper_bound), | |
84fb43a1 EB |
2911 | create_range_type (gnu_string_index_type, |
2912 | gnu_lower_bound, | |
2913 | gnu_upper_bound), | |
c1abd261 | 2914 | gnat_entity); |
a1ab4c31 AC |
2915 | |
2916 | gnu_type | |
523e82a7 EB |
2917 | = build_nonshared_array_type (gnat_to_gnu_type |
2918 | (Component_Type (gnat_entity)), | |
2919 | gnu_index_type); | |
d8e94f79 | 2920 | if (array_type_has_nonaliased_component (gnu_type, gnat_entity)) |
c3734896 | 2921 | TYPE_NONALIASED_COMPONENT (gnu_type) = 1; |
794511d2 | 2922 | relate_alias_sets (gnu_type, gnu_string_type, ALIAS_SET_COPY); |
a1ab4c31 AC |
2923 | } |
2924 | break; | |
2925 | ||
2926 | /* Record Types and Subtypes | |
2927 | ||
2928 | The following fields are defined on record types: | |
2929 | ||
2930 | Has_Discriminants True if the record has discriminants | |
2931 | First_Discriminant Points to head of list of discriminants | |
2932 | First_Entity Points to head of list of fields | |
2933 | Is_Tagged_Type True if the record is tagged | |
2934 | ||
2935 | Implementation of Ada records and discriminated records: | |
2936 | ||
2937 | A record type definition is transformed into the equivalent of a C | |
2938 | struct definition. The fields that are the discriminants which are | |
2939 | found in the Full_Type_Declaration node and the elements of the | |
2940 | Component_List found in the Record_Type_Definition node. The | |
2941 | Component_List can be a recursive structure since each Variant of | |
2942 | the Variant_Part of the Component_List has a Component_List. | |
2943 | ||
2944 | Processing of a record type definition comprises starting the list of | |
2945 | field declarations here from the discriminants and the calling the | |
2946 | function components_to_record to add the rest of the fields from the | |
2ddc34ba | 2947 | component list and return the gnu type node. The function |
a1ab4c31 AC |
2948 | components_to_record will call itself recursively as it traverses |
2949 | the tree. */ | |
2950 | ||
2951 | case E_Record_Type: | |
2952 | if (Has_Complex_Representation (gnat_entity)) | |
2953 | { | |
2954 | gnu_type | |
2955 | = build_complex_type | |
2956 | (get_unpadded_type | |
2957 | (Etype (Defining_Entity | |
2958 | (First (Component_Items | |
2959 | (Component_List | |
2960 | (Type_Definition | |
2961 | (Declaration_Node (gnat_entity))))))))); | |
2962 | ||
2963 | break; | |
2964 | } | |
2965 | ||
2966 | { | |
2967 | Node_Id full_definition = Declaration_Node (gnat_entity); | |
2968 | Node_Id record_definition = Type_Definition (full_definition); | |
908ba941 | 2969 | Node_Id gnat_constr; |
a1ab4c31 | 2970 | Entity_Id gnat_field; |
908ba941 EB |
2971 | tree gnu_field, gnu_field_list = NULL_TREE; |
2972 | tree gnu_get_parent; | |
a1ab4c31 | 2973 | /* Set PACKED in keeping with gnat_to_gnu_field. */ |
908ba941 | 2974 | const int packed |
a1ab4c31 AC |
2975 | = Is_Packed (gnat_entity) |
2976 | ? 1 | |
2977 | : Component_Alignment (gnat_entity) == Calign_Storage_Unit | |
2978 | ? -1 | |
14ecca2e EB |
2979 | : 0; |
2980 | const bool has_align = Known_Alignment (gnat_entity); | |
908ba941 EB |
2981 | const bool has_discr = Has_Discriminants (gnat_entity); |
2982 | const bool has_rep = Has_Specified_Layout (gnat_entity); | |
2983 | const bool is_extension | |
a1ab4c31 AC |
2984 | = (Is_Tagged_Type (gnat_entity) |
2985 | && Nkind (record_definition) == N_Derived_Type_Definition); | |
908ba941 EB |
2986 | const bool is_unchecked_union = Is_Unchecked_Union (gnat_entity); |
2987 | bool all_rep = has_rep; | |
a1ab4c31 AC |
2988 | |
2989 | /* See if all fields have a rep clause. Stop when we find one | |
2990 | that doesn't. */ | |
8cd28148 EB |
2991 | if (all_rep) |
2992 | for (gnat_field = First_Entity (gnat_entity); | |
2993 | Present (gnat_field); | |
2994 | gnat_field = Next_Entity (gnat_field)) | |
2995 | if ((Ekind (gnat_field) == E_Component | |
2996 | || Ekind (gnat_field) == E_Discriminant) | |
2997 | && No (Component_Clause (gnat_field))) | |
2998 | { | |
2999 | all_rep = false; | |
3000 | break; | |
3001 | } | |
a1ab4c31 AC |
3002 | |
3003 | /* If this is a record extension, go a level further to find the | |
3004 | record definition. Also, verify we have a Parent_Subtype. */ | |
3005 | if (is_extension) | |
3006 | { | |
3007 | if (!type_annotate_only | |
3008 | || Present (Record_Extension_Part (record_definition))) | |
3009 | record_definition = Record_Extension_Part (record_definition); | |
3010 | ||
3011 | gcc_assert (type_annotate_only | |
3012 | || Present (Parent_Subtype (gnat_entity))); | |
3013 | } | |
3014 | ||
3015 | /* Make a node for the record. If we are not defining the record, | |
3016 | suppress expanding incomplete types. */ | |
3017 | gnu_type = make_node (tree_code_for_record_type (gnat_entity)); | |
0fb2335d | 3018 | TYPE_NAME (gnu_type) = gnu_entity_name; |
14ecca2e | 3019 | TYPE_PACKED (gnu_type) = (packed != 0) || has_align || has_rep; |
ee45a32d EB |
3020 | TYPE_REVERSE_STORAGE_ORDER (gnu_type) |
3021 | = Reverse_Storage_Order (gnat_entity); | |
74746d49 | 3022 | process_attributes (&gnu_type, &attr_list, true, gnat_entity); |
a1ab4c31 AC |
3023 | |
3024 | if (!definition) | |
8cd28148 EB |
3025 | { |
3026 | defer_incomplete_level++; | |
3027 | this_deferred = true; | |
3028 | } | |
a1ab4c31 | 3029 | |
14ecca2e EB |
3030 | /* If both a size and rep clause were specified, put the size on |
3031 | the record type now so that it can get the proper layout. */ | |
fc893455 AC |
3032 | if (has_rep && Known_RM_Size (gnat_entity)) |
3033 | TYPE_SIZE (gnu_type) | |
3034 | = UI_To_gnu (RM_Size (gnat_entity), bitsizetype); | |
a1ab4c31 | 3035 | |
14ecca2e EB |
3036 | /* Always set the alignment on the record type here so that it can |
3037 | get the proper layout. */ | |
3038 | if (has_align) | |
fe37c7af MM |
3039 | SET_TYPE_ALIGN (gnu_type, |
3040 | validate_alignment (Alignment (gnat_entity), | |
3041 | gnat_entity, 0)); | |
14ecca2e | 3042 | else |
a1ab4c31 | 3043 | { |
fe37c7af | 3044 | SET_TYPE_ALIGN (gnu_type, 0); |
14ecca2e EB |
3045 | |
3046 | /* If a type needs strict alignment, the minimum size will be the | |
3047 | type size instead of the RM size (see validate_size). Cap the | |
3048 | alignment lest it causes this type size to become too large. */ | |
3049 | if (Strict_Alignment (gnat_entity) && Known_RM_Size (gnat_entity)) | |
3050 | { | |
3051 | unsigned int max_size = UI_To_Int (RM_Size (gnat_entity)); | |
3052 | unsigned int max_align = max_size & -max_size; | |
3053 | if (max_align < BIGGEST_ALIGNMENT) | |
3054 | TYPE_MAX_ALIGN (gnu_type) = max_align; | |
3055 | } | |
a1ab4c31 | 3056 | } |
a1ab4c31 AC |
3057 | |
3058 | /* If we have a Parent_Subtype, make a field for the parent. If | |
3059 | this record has rep clauses, force the position to zero. */ | |
3060 | if (Present (Parent_Subtype (gnat_entity))) | |
3061 | { | |
3062 | Entity_Id gnat_parent = Parent_Subtype (gnat_entity); | |
08cb7d42 | 3063 | tree gnu_dummy_parent_type = make_node (RECORD_TYPE); |
a1ab4c31 AC |
3064 | tree gnu_parent; |
3065 | ||
3066 | /* A major complexity here is that the parent subtype will | |
a8c4c75a EB |
3067 | reference our discriminants in its Stored_Constraint list. |
3068 | But those must reference the parent component of this record | |
3069 | which is precisely of the parent subtype we have not built yet! | |
a1ab4c31 AC |
3070 | To break the circle we first build a dummy COMPONENT_REF which |
3071 | represents the "get to the parent" operation and initialize | |
3072 | each of those discriminants to a COMPONENT_REF of the above | |
3073 | dummy parent referencing the corresponding discriminant of the | |
3074 | base type of the parent subtype. */ | |
08cb7d42 | 3075 | gnu_get_parent = build3 (COMPONENT_REF, gnu_dummy_parent_type, |
a1ab4c31 | 3076 | build0 (PLACEHOLDER_EXPR, gnu_type), |
c172df28 AH |
3077 | build_decl (input_location, |
3078 | FIELD_DECL, NULL_TREE, | |
08cb7d42 | 3079 | gnu_dummy_parent_type), |
a1ab4c31 AC |
3080 | NULL_TREE); |
3081 | ||
c244bf8f | 3082 | if (has_discr) |
a1ab4c31 AC |
3083 | for (gnat_field = First_Stored_Discriminant (gnat_entity); |
3084 | Present (gnat_field); | |
3085 | gnat_field = Next_Stored_Discriminant (gnat_field)) | |
3086 | if (Present (Corresponding_Discriminant (gnat_field))) | |
e99c3ccc EB |
3087 | { |
3088 | tree gnu_field | |
3089 | = gnat_to_gnu_field_decl (Corresponding_Discriminant | |
3090 | (gnat_field)); | |
3091 | save_gnu_tree | |
3092 | (gnat_field, | |
3093 | build3 (COMPONENT_REF, TREE_TYPE (gnu_field), | |
3094 | gnu_get_parent, gnu_field, NULL_TREE), | |
3095 | true); | |
3096 | } | |
a1ab4c31 | 3097 | |
77022fa8 EB |
3098 | /* Then we build the parent subtype. If it has discriminants but |
3099 | the type itself has unknown discriminants, this means that it | |
3100 | doesn't contain information about how the discriminants are | |
3101 | derived from those of the ancestor type, so it cannot be used | |
3102 | directly. Instead it is built by cloning the parent subtype | |
3103 | of the underlying record view of the type, for which the above | |
3104 | derivation of discriminants has been made explicit. */ | |
3105 | if (Has_Discriminants (gnat_parent) | |
3106 | && Has_Unknown_Discriminants (gnat_entity)) | |
3107 | { | |
3108 | Entity_Id gnat_uview = Underlying_Record_View (gnat_entity); | |
3109 | ||
3110 | /* If we are defining the type, the underlying record | |
3111 | view must already have been elaborated at this point. | |
3112 | Otherwise do it now as its parent subtype cannot be | |
3113 | technically elaborated on its own. */ | |
3114 | if (definition) | |
3115 | gcc_assert (present_gnu_tree (gnat_uview)); | |
3116 | else | |
3117 | gnat_to_gnu_entity (gnat_uview, NULL_TREE, 0); | |
3118 | ||
3119 | gnu_parent = gnat_to_gnu_type (Parent_Subtype (gnat_uview)); | |
3120 | ||
3121 | /* Substitute the "get to the parent" of the type for that | |
3122 | of its underlying record view in the cloned type. */ | |
3123 | for (gnat_field = First_Stored_Discriminant (gnat_uview); | |
3124 | Present (gnat_field); | |
3125 | gnat_field = Next_Stored_Discriminant (gnat_field)) | |
3126 | if (Present (Corresponding_Discriminant (gnat_field))) | |
3127 | { | |
c6bd4220 | 3128 | tree gnu_field = gnat_to_gnu_field_decl (gnat_field); |
77022fa8 EB |
3129 | tree gnu_ref |
3130 | = build3 (COMPONENT_REF, TREE_TYPE (gnu_field), | |
3131 | gnu_get_parent, gnu_field, NULL_TREE); | |
3132 | gnu_parent | |
3133 | = substitute_in_type (gnu_parent, gnu_field, gnu_ref); | |
3134 | } | |
3135 | } | |
3136 | else | |
3137 | gnu_parent = gnat_to_gnu_type (gnat_parent); | |
a1ab4c31 | 3138 | |
8c41a1c8 EB |
3139 | /* The parent field needs strict alignment so, if it is to |
3140 | be created with a component clause below, then we need | |
3141 | to apply the same adjustment as in gnat_to_gnu_field. */ | |
3142 | if (has_rep && TYPE_ALIGN (gnu_type) < TYPE_ALIGN (gnu_parent)) | |
fe37c7af | 3143 | SET_TYPE_ALIGN (gnu_type, TYPE_ALIGN (gnu_parent)); |
8c41a1c8 | 3144 | |
a1ab4c31 AC |
3145 | /* Finally we fix up both kinds of twisted COMPONENT_REF we have |
3146 | initially built. The discriminants must reference the fields | |
3147 | of the parent subtype and not those of its base type for the | |
3148 | placeholder machinery to properly work. */ | |
c244bf8f | 3149 | if (has_discr) |
cdaa0e0b EB |
3150 | { |
3151 | /* The actual parent subtype is the full view. */ | |
3152 | if (IN (Ekind (gnat_parent), Private_Kind)) | |
a1ab4c31 | 3153 | { |
cdaa0e0b EB |
3154 | if (Present (Full_View (gnat_parent))) |
3155 | gnat_parent = Full_View (gnat_parent); | |
3156 | else | |
3157 | gnat_parent = Underlying_Full_View (gnat_parent); | |
a1ab4c31 AC |
3158 | } |
3159 | ||
cdaa0e0b EB |
3160 | for (gnat_field = First_Stored_Discriminant (gnat_entity); |
3161 | Present (gnat_field); | |
3162 | gnat_field = Next_Stored_Discriminant (gnat_field)) | |
3163 | if (Present (Corresponding_Discriminant (gnat_field))) | |
3164 | { | |
e028b0bb | 3165 | Entity_Id field; |
cdaa0e0b EB |
3166 | for (field = First_Stored_Discriminant (gnat_parent); |
3167 | Present (field); | |
3168 | field = Next_Stored_Discriminant (field)) | |
3169 | if (same_discriminant_p (gnat_field, field)) | |
3170 | break; | |
3171 | gcc_assert (Present (field)); | |
3172 | TREE_OPERAND (get_gnu_tree (gnat_field), 1) | |
3173 | = gnat_to_gnu_field_decl (field); | |
3174 | } | |
3175 | } | |
3176 | ||
a1ab4c31 AC |
3177 | /* The "get to the parent" COMPONENT_REF must be given its |
3178 | proper type... */ | |
3179 | TREE_TYPE (gnu_get_parent) = gnu_parent; | |
3180 | ||
8cd28148 | 3181 | /* ...and reference the _Parent field of this record. */ |
a6a29d0c | 3182 | gnu_field |
76af763d | 3183 | = create_field_decl (parent_name_id, |
da01bfee | 3184 | gnu_parent, gnu_type, |
c244bf8f EB |
3185 | has_rep |
3186 | ? TYPE_SIZE (gnu_parent) : NULL_TREE, | |
3187 | has_rep | |
da01bfee EB |
3188 | ? bitsize_zero_node : NULL_TREE, |
3189 | 0, 1); | |
a6a29d0c EB |
3190 | DECL_INTERNAL_P (gnu_field) = 1; |
3191 | TREE_OPERAND (gnu_get_parent, 1) = gnu_field; | |
3192 | TYPE_FIELDS (gnu_type) = gnu_field; | |
a1ab4c31 AC |
3193 | } |
3194 | ||
3195 | /* Make the fields for the discriminants and put them into the record | |
3196 | unless it's an Unchecked_Union. */ | |
c244bf8f | 3197 | if (has_discr) |
a1ab4c31 AC |
3198 | for (gnat_field = First_Stored_Discriminant (gnat_entity); |
3199 | Present (gnat_field); | |
3200 | gnat_field = Next_Stored_Discriminant (gnat_field)) | |
3201 | { | |
8cd28148 EB |
3202 | /* If this is a record extension and this discriminant is the |
3203 | renaming of another discriminant, we've handled it above. */ | |
a1ab4c31 AC |
3204 | if (Present (Parent_Subtype (gnat_entity)) |
3205 | && Present (Corresponding_Discriminant (gnat_field))) | |
3206 | continue; | |
3207 | ||
c00d5b12 EB |
3208 | /* However, if we are just annotating types, the Parent_Subtype |
3209 | doesn't exist so we need skip the discriminant altogether. */ | |
3210 | if (type_annotate_only | |
3211 | && Is_Tagged_Type (gnat_entity) | |
3212 | && Is_Derived_Type (gnat_entity) | |
3213 | && Present (Corresponding_Discriminant (gnat_field))) | |
3214 | continue; | |
3215 | ||
a1ab4c31 | 3216 | gnu_field |
839f2864 EB |
3217 | = gnat_to_gnu_field (gnat_field, gnu_type, packed, definition, |
3218 | debug_info_p); | |
a1ab4c31 AC |
3219 | |
3220 | /* Make an expression using a PLACEHOLDER_EXPR from the | |
3221 | FIELD_DECL node just created and link that with the | |
8cd28148 | 3222 | corresponding GNAT defining identifier. */ |
a1ab4c31 AC |
3223 | save_gnu_tree (gnat_field, |
3224 | build3 (COMPONENT_REF, TREE_TYPE (gnu_field), | |
8cd28148 | 3225 | build0 (PLACEHOLDER_EXPR, gnu_type), |
a1ab4c31 AC |
3226 | gnu_field, NULL_TREE), |
3227 | true); | |
3228 | ||
8cd28148 | 3229 | if (!is_unchecked_union) |
a1ab4c31 | 3230 | { |
910ad8de | 3231 | DECL_CHAIN (gnu_field) = gnu_field_list; |
a1ab4c31 AC |
3232 | gnu_field_list = gnu_field; |
3233 | } | |
3234 | } | |
3235 | ||
908ba941 EB |
3236 | /* If we have a derived untagged type that renames discriminants in |
3237 | the root type, the (stored) discriminants are a just copy of the | |
3238 | discriminants of the root type. This means that any constraints | |
3239 | added by the renaming in the derivation are disregarded as far | |
3240 | as the layout of the derived type is concerned. To rescue them, | |
3241 | we change the type of the (stored) discriminants to a subtype | |
3242 | with the bounds of the type of the visible discriminants. */ | |
3243 | if (has_discr | |
3244 | && !is_extension | |
3245 | && Stored_Constraint (gnat_entity) != No_Elist) | |
3246 | for (gnat_constr = First_Elmt (Stored_Constraint (gnat_entity)); | |
3247 | gnat_constr != No_Elmt; | |
3248 | gnat_constr = Next_Elmt (gnat_constr)) | |
3249 | if (Nkind (Node (gnat_constr)) == N_Identifier | |
3250 | /* Ignore access discriminants. */ | |
3251 | && !Is_Access_Type (Etype (Node (gnat_constr))) | |
3252 | && Ekind (Entity (Node (gnat_constr))) == E_Discriminant) | |
3253 | { | |
3254 | Entity_Id gnat_discr = Entity (Node (gnat_constr)); | |
e028b0bb EB |
3255 | tree gnu_discr_type, gnu_ref; |
3256 | ||
3257 | /* If the scope of the discriminant is not the record type, | |
3258 | this means that we're processing the implicit full view | |
3259 | of a type derived from a private discriminated type: in | |
3260 | this case, the Stored_Constraint list is simply copied | |
3261 | from the partial view, see Build_Derived_Private_Type. | |
3262 | So we need to retrieve the corresponding discriminant | |
3263 | of the implicit full view, otherwise we will abort. */ | |
3264 | if (Scope (gnat_discr) != gnat_entity) | |
3265 | { | |
3266 | Entity_Id field; | |
3267 | for (field = First_Entity (gnat_entity); | |
3268 | Present (field); | |
3269 | field = Next_Entity (field)) | |
3270 | if (Ekind (field) == E_Discriminant | |
3271 | && same_discriminant_p (gnat_discr, field)) | |
3272 | break; | |
3273 | gcc_assert (Present (field)); | |
3274 | gnat_discr = field; | |
3275 | } | |
3276 | ||
3277 | gnu_discr_type = gnat_to_gnu_type (Etype (gnat_discr)); | |
3278 | gnu_ref | |
908ba941 EB |
3279 | = gnat_to_gnu_entity (Original_Record_Component (gnat_discr), |
3280 | NULL_TREE, 0); | |
3281 | ||
3282 | /* GNU_REF must be an expression using a PLACEHOLDER_EXPR built | |
3283 | just above for one of the stored discriminants. */ | |
3284 | gcc_assert (TREE_TYPE (TREE_OPERAND (gnu_ref, 0)) == gnu_type); | |
3285 | ||
3286 | if (gnu_discr_type != TREE_TYPE (gnu_ref)) | |
3287 | { | |
3288 | const unsigned prec = TYPE_PRECISION (TREE_TYPE (gnu_ref)); | |
3289 | tree gnu_subtype | |
3290 | = TYPE_UNSIGNED (TREE_TYPE (gnu_ref)) | |
3291 | ? make_unsigned_type (prec) : make_signed_type (prec); | |
3292 | TREE_TYPE (gnu_subtype) = TREE_TYPE (gnu_ref); | |
3293 | TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1; | |
3294 | SET_TYPE_RM_MIN_VALUE (gnu_subtype, | |
3295 | TYPE_MIN_VALUE (gnu_discr_type)); | |
3296 | SET_TYPE_RM_MAX_VALUE (gnu_subtype, | |
3297 | TYPE_MAX_VALUE (gnu_discr_type)); | |
3298 | TREE_TYPE (gnu_ref) | |
3299 | = TREE_TYPE (TREE_OPERAND (gnu_ref, 1)) = gnu_subtype; | |
3300 | } | |
3301 | } | |
3302 | ||
8cd28148 | 3303 | /* Add the fields into the record type and finish it up. */ |
a1ab4c31 | 3304 | components_to_record (gnu_type, Component_List (record_definition), |
ef0feeb2 | 3305 | gnu_field_list, packed, definition, false, |
fd787640 | 3306 | all_rep, is_unchecked_union, |
c1a569ef | 3307 | artificial_p, debug_info_p, |
ef0feeb2 | 3308 | false, OK_To_Reorder_Components (gnat_entity), |
b1a785fb | 3309 | all_rep ? NULL_TREE : bitsize_zero_node, NULL); |
a1ab4c31 | 3310 | |
a1ab4c31 AC |
3311 | /* Fill in locations of fields. */ |
3312 | annotate_rep (gnat_entity, gnu_type); | |
3313 | ||
8cd28148 EB |
3314 | /* If there are any entities in the chain corresponding to components |
3315 | that we did not elaborate, ensure we elaborate their types if they | |
3316 | are Itypes. */ | |
a1ab4c31 | 3317 | for (gnat_temp = First_Entity (gnat_entity); |
8cd28148 EB |
3318 | Present (gnat_temp); |
3319 | gnat_temp = Next_Entity (gnat_temp)) | |
a1ab4c31 AC |
3320 | if ((Ekind (gnat_temp) == E_Component |
3321 | || Ekind (gnat_temp) == E_Discriminant) | |
3322 | && Is_Itype (Etype (gnat_temp)) | |
3323 | && !present_gnu_tree (gnat_temp)) | |
3324 | gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0); | |
871fda0a EB |
3325 | |
3326 | /* If this is a record type associated with an exception definition, | |
3327 | equate its fields to those of the standard exception type. This | |
3328 | will make it possible to convert between them. */ | |
3329 | if (gnu_entity_name == exception_data_name_id) | |
3330 | { | |
3331 | tree gnu_std_field; | |
3332 | for (gnu_field = TYPE_FIELDS (gnu_type), | |
3333 | gnu_std_field = TYPE_FIELDS (except_type_node); | |
3334 | gnu_field; | |
910ad8de NF |
3335 | gnu_field = DECL_CHAIN (gnu_field), |
3336 | gnu_std_field = DECL_CHAIN (gnu_std_field)) | |
871fda0a EB |
3337 | SET_DECL_ORIGINAL_FIELD_TO_FIELD (gnu_field, gnu_std_field); |
3338 | gcc_assert (!gnu_std_field); | |
3339 | } | |
a1ab4c31 AC |
3340 | } |
3341 | break; | |
3342 | ||
3343 | case E_Class_Wide_Subtype: | |
3344 | /* If an equivalent type is present, that is what we should use. | |
3345 | Otherwise, fall through to handle this like a record subtype | |
3346 | since it may have constraints. */ | |
3347 | if (gnat_equiv_type != gnat_entity) | |
3348 | { | |
3349 | gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0); | |
3350 | maybe_present = true; | |
3351 | break; | |
3352 | } | |
3353 | ||
3354 | /* ... fall through ... */ | |
3355 | ||
3356 | case E_Record_Subtype: | |
a1ab4c31 AC |
3357 | /* If Cloned_Subtype is Present it means this record subtype has |
3358 | identical layout to that type or subtype and we should use | |
3359 | that GCC type for this one. The front end guarantees that | |
3360 | the component list is shared. */ | |
3361 | if (Present (Cloned_Subtype (gnat_entity))) | |
3362 | { | |
3363 | gnu_decl = gnat_to_gnu_entity (Cloned_Subtype (gnat_entity), | |
3364 | NULL_TREE, 0); | |
3365 | maybe_present = true; | |
8cd28148 | 3366 | break; |
a1ab4c31 AC |
3367 | } |
3368 | ||
3369 | /* Otherwise, first ensure the base type is elaborated. Then, if we are | |
8cd28148 EB |
3370 | changing the type, make a new type with each field having the type of |
3371 | the field in the new subtype but the position computed by transforming | |
3372 | every discriminant reference according to the constraints. We don't | |
3373 | see any difference between private and non-private type here since | |
3374 | derivations from types should have been deferred until the completion | |
3375 | of the private type. */ | |
a1ab4c31 AC |
3376 | else |
3377 | { | |
3378 | Entity_Id gnat_base_type = Implementation_Base_Type (gnat_entity); | |
c244bf8f | 3379 | tree gnu_base_type; |
a1ab4c31 AC |
3380 | |
3381 | if (!definition) | |
8cd28148 EB |
3382 | { |
3383 | defer_incomplete_level++; | |
3384 | this_deferred = true; | |
3385 | } | |
a1ab4c31 | 3386 | |
f797c2b7 EB |
3387 | gnu_base_type |
3388 | = TYPE_MAIN_VARIANT (gnat_to_gnu_type (gnat_base_type)); | |
a1ab4c31 | 3389 | |
a1ab4c31 AC |
3390 | if (present_gnu_tree (gnat_entity)) |
3391 | { | |
3392 | maybe_present = true; | |
3393 | break; | |
3394 | } | |
3395 | ||
901ad63f EB |
3396 | /* If this is a record subtype associated with a dispatch table, |
3397 | strip the suffix. This is necessary to make sure 2 different | |
3398 | subtypes associated with the imported and exported views of a | |
3399 | dispatch table are properly merged in LTO mode. */ | |
3400 | if (Is_Dispatch_Table_Entity (gnat_entity)) | |
3401 | { | |
3402 | char *p; | |
3403 | Get_Encoded_Name (gnat_entity); | |
c679a915 | 3404 | p = strchr (Name_Buffer, '_'); |
901ad63f | 3405 | gcc_assert (p); |
c679a915 | 3406 | strcpy (p+2, "dtS"); |
901ad63f EB |
3407 | gnu_entity_name = get_identifier (Name_Buffer); |
3408 | } | |
3409 | ||
8cd28148 | 3410 | /* When the subtype has discriminants and these discriminants affect |
95c1c4bb EB |
3411 | the initial shape it has inherited, factor them in. But for an |
3412 | Unchecked_Union (it must be an Itype), just return the type. | |
8cd28148 EB |
3413 | We can't just test Is_Constrained because private subtypes without |
3414 | discriminants of types with discriminants with default expressions | |
3415 | are Is_Constrained but aren't constrained! */ | |
a1ab4c31 | 3416 | if (IN (Ekind (gnat_base_type), Record_Kind) |
a1ab4c31 | 3417 | && !Is_Unchecked_Union (gnat_base_type) |
8cd28148 | 3418 | && !Is_For_Access_Subtype (gnat_entity) |
8cd28148 | 3419 | && Has_Discriminants (gnat_entity) |
a8c4c75a | 3420 | && Is_Constrained (gnat_entity) |
8cd28148 | 3421 | && Stored_Constraint (gnat_entity) != No_Elist) |
a1ab4c31 | 3422 | { |
9771b263 | 3423 | vec<subst_pair> gnu_subst_list |
8cd28148 | 3424 | = build_subst_list (gnat_entity, gnat_base_type, definition); |
44e9e3ec | 3425 | tree gnu_unpad_base_type, gnu_rep_part, gnu_variant_part; |
fb7fb701 | 3426 | tree gnu_pos_list, gnu_field_list = NULL_TREE; |
44e9e3ec | 3427 | bool selected_variant = false, all_constant_pos = true; |
8cd28148 | 3428 | Entity_Id gnat_field; |
9771b263 | 3429 | vec<variant_desc> gnu_variant_list; |
a1ab4c31 AC |
3430 | |
3431 | gnu_type = make_node (RECORD_TYPE); | |
0fb2335d | 3432 | TYPE_NAME (gnu_type) = gnu_entity_name; |
eb59e428 PMR |
3433 | if (gnat_encodings == DWARF_GNAT_ENCODINGS_MINIMAL) |
3434 | SET_TYPE_DEBUG_TYPE (gnu_type, gnu_base_type); | |
92eee8f8 | 3435 | TYPE_PACKED (gnu_type) = TYPE_PACKED (gnu_base_type); |
ee45a32d EB |
3436 | TYPE_REVERSE_STORAGE_ORDER (gnu_type) |
3437 | = Reverse_Storage_Order (gnat_entity); | |
74746d49 | 3438 | process_attributes (&gnu_type, &attr_list, true, gnat_entity); |
a1ab4c31 AC |
3439 | |
3440 | /* Set the size, alignment and alias set of the new type to | |
95c1c4bb EB |
3441 | match that of the old one, doing required substitutions. */ |
3442 | copy_and_substitute_in_size (gnu_type, gnu_base_type, | |
3443 | gnu_subst_list); | |
c244bf8f | 3444 | |
315cff15 | 3445 | if (TYPE_IS_PADDING_P (gnu_base_type)) |
c244bf8f EB |
3446 | gnu_unpad_base_type = TREE_TYPE (TYPE_FIELDS (gnu_base_type)); |
3447 | else | |
3448 | gnu_unpad_base_type = gnu_base_type; | |
3449 | ||
44e9e3ec EB |
3450 | /* Look for REP and variant parts in the base type. */ |
3451 | gnu_rep_part = get_rep_part (gnu_unpad_base_type); | |
95c1c4bb EB |
3452 | gnu_variant_part = get_variant_part (gnu_unpad_base_type); |
3453 | ||
3454 | /* If there is a variant part, we must compute whether the | |
3455 | constraints statically select a particular variant. If | |
3456 | so, we simply drop the qualified union and flatten the | |
3457 | list of fields. Otherwise we'll build a new qualified | |
3458 | union for the variants that are still relevant. */ | |
3459 | if (gnu_variant_part) | |
3460 | { | |
fb7fb701 | 3461 | variant_desc *v; |
f54ee980 | 3462 | unsigned int i; |
fb7fb701 | 3463 | |
95c1c4bb EB |
3464 | gnu_variant_list |
3465 | = build_variant_list (TREE_TYPE (gnu_variant_part), | |
9771b263 | 3466 | gnu_subst_list, |
6e1aa848 | 3467 | vNULL); |
95c1c4bb EB |
3468 | |
3469 | /* If all the qualifiers are unconditionally true, the | |
3470 | innermost variant is statically selected. */ | |
3471 | selected_variant = true; | |
9771b263 | 3472 | FOR_EACH_VEC_ELT (gnu_variant_list, i, v) |
fb7fb701 | 3473 | if (!integer_onep (v->qual)) |
95c1c4bb EB |
3474 | { |
3475 | selected_variant = false; | |
3476 | break; | |
3477 | } | |
3478 | ||
3479 | /* Otherwise, create the new variants. */ | |
3480 | if (!selected_variant) | |
9771b263 | 3481 | FOR_EACH_VEC_ELT (gnu_variant_list, i, v) |
95c1c4bb | 3482 | { |
fb7fb701 | 3483 | tree old_variant = v->type; |
95c1c4bb | 3484 | tree new_variant = make_node (RECORD_TYPE); |
82ea8185 EB |
3485 | tree suffix |
3486 | = concat_name (DECL_NAME (gnu_variant_part), | |
3487 | IDENTIFIER_POINTER | |
3488 | (DECL_NAME (v->field))); | |
95c1c4bb | 3489 | TYPE_NAME (new_variant) |
82ea8185 EB |
3490 | = concat_name (TYPE_NAME (gnu_type), |
3491 | IDENTIFIER_POINTER (suffix)); | |
ee45a32d EB |
3492 | TYPE_REVERSE_STORAGE_ORDER (new_variant) |
3493 | = TYPE_REVERSE_STORAGE_ORDER (gnu_type); | |
95c1c4bb EB |
3494 | copy_and_substitute_in_size (new_variant, old_variant, |
3495 | gnu_subst_list); | |
82ea8185 | 3496 | v->new_type = new_variant; |
95c1c4bb EB |
3497 | } |
3498 | } | |
3499 | else | |
3500 | { | |
9771b263 | 3501 | gnu_variant_list.create (0); |
95c1c4bb EB |
3502 | selected_variant = false; |
3503 | } | |
3504 | ||
44e9e3ec | 3505 | /* Make a list of fields and their position in the base type. */ |
c244bf8f | 3506 | gnu_pos_list |
95c1c4bb | 3507 | = build_position_list (gnu_unpad_base_type, |
9771b263 | 3508 | gnu_variant_list.exists () |
44e9e3ec | 3509 | && !selected_variant, |
95c1c4bb EB |
3510 | size_zero_node, bitsize_zero_node, |
3511 | BIGGEST_ALIGNMENT, NULL_TREE); | |
a1ab4c31 | 3512 | |
44e9e3ec EB |
3513 | /* Now go down every component in the subtype and compute its |
3514 | size and position from those of the component in the base | |
3515 | type and from the constraints of the subtype. */ | |
a1ab4c31 | 3516 | for (gnat_field = First_Entity (gnat_entity); |
c244bf8f EB |
3517 | Present (gnat_field); |
3518 | gnat_field = Next_Entity (gnat_field)) | |
a1ab4c31 AC |
3519 | if ((Ekind (gnat_field) == E_Component |
3520 | || Ekind (gnat_field) == E_Discriminant) | |
c244bf8f EB |
3521 | && !(Present (Corresponding_Discriminant (gnat_field)) |
3522 | && Is_Tagged_Type (gnat_base_type)) | |
44e9e3ec EB |
3523 | && Underlying_Type |
3524 | (Scope (Original_Record_Component (gnat_field))) | |
c244bf8f | 3525 | == gnat_base_type) |
a1ab4c31 | 3526 | { |
a6a29d0c | 3527 | Name_Id gnat_name = Chars (gnat_field); |
c244bf8f EB |
3528 | Entity_Id gnat_old_field |
3529 | = Original_Record_Component (gnat_field); | |
a1ab4c31 | 3530 | tree gnu_old_field |
c244bf8f | 3531 | = gnat_to_gnu_field_decl (gnat_old_field); |
95c1c4bb | 3532 | tree gnu_context = DECL_CONTEXT (gnu_old_field); |
44e9e3ec | 3533 | tree gnu_field, gnu_field_type, gnu_size, gnu_pos; |
95c1c4bb | 3534 | tree gnu_cont_type, gnu_last = NULL_TREE; |
3f6f0eb2 EB |
3535 | |
3536 | /* If the type is the same, retrieve the GCC type from the | |
3537 | old field to take into account possible adjustments. */ | |
c244bf8f | 3538 | if (Etype (gnat_field) == Etype (gnat_old_field)) |
3f6f0eb2 EB |
3539 | gnu_field_type = TREE_TYPE (gnu_old_field); |
3540 | else | |
3541 | gnu_field_type = gnat_to_gnu_type (Etype (gnat_field)); | |
3542 | ||
a1ab4c31 AC |
3543 | /* If there was a component clause, the field types must be |
3544 | the same for the type and subtype, so copy the data from | |
3545 | the old field to avoid recomputation here. Also if the | |
3546 | field is justified modular and the optimization in | |
3547 | gnat_to_gnu_field was applied. */ | |
c244bf8f | 3548 | if (Present (Component_Clause (gnat_old_field)) |
a1ab4c31 AC |
3549 | || (TREE_CODE (gnu_field_type) == RECORD_TYPE |
3550 | && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type) | |
3551 | && TREE_TYPE (TYPE_FIELDS (gnu_field_type)) | |
3552 | == TREE_TYPE (gnu_old_field))) | |
3553 | { | |
3554 | gnu_size = DECL_SIZE (gnu_old_field); | |
3555 | gnu_field_type = TREE_TYPE (gnu_old_field); | |
3556 | } | |
3557 | ||
3558 | /* If the old field was packed and of constant size, we | |
3559 | have to get the old size here, as it might differ from | |
3560 | what the Etype conveys and the latter might overlap | |
3561 | onto the following field. Try to arrange the type for | |
3562 | possible better packing along the way. */ | |
3563 | else if (DECL_PACKED (gnu_old_field) | |
3564 | && TREE_CODE (DECL_SIZE (gnu_old_field)) | |
3565 | == INTEGER_CST) | |
3566 | { | |
3567 | gnu_size = DECL_SIZE (gnu_old_field); | |
e1e5852c | 3568 | if (RECORD_OR_UNION_TYPE_P (gnu_field_type) |
315cff15 | 3569 | && !TYPE_FAT_POINTER_P (gnu_field_type) |
cc269bb6 | 3570 | && tree_fits_uhwi_p (TYPE_SIZE (gnu_field_type))) |
a1ab4c31 AC |
3571 | gnu_field_type |
3572 | = make_packable_type (gnu_field_type, true); | |
3573 | } | |
3574 | ||
c244bf8f EB |
3575 | else |
3576 | gnu_size = TYPE_SIZE (gnu_field_type); | |
3577 | ||
95c1c4bb EB |
3578 | /* If the context of the old field is the base type or its |
3579 | REP part (if any), put the field directly in the new | |
3580 | type; otherwise look up the context in the variant list | |
3581 | and put the field either in the new type if there is a | |
3582 | selected variant or in one of the new variants. */ | |
3583 | if (gnu_context == gnu_unpad_base_type | |
44e9e3ec | 3584 | || (gnu_rep_part |
95c1c4bb EB |
3585 | && gnu_context == TREE_TYPE (gnu_rep_part))) |
3586 | gnu_cont_type = gnu_type; | |
3587 | else | |
a1ab4c31 | 3588 | { |
fb7fb701 | 3589 | variant_desc *v; |
f54ee980 | 3590 | unsigned int i; |
44e9e3ec | 3591 | tree rep_part; |
fb7fb701 | 3592 | |
9771b263 | 3593 | FOR_EACH_VEC_ELT (gnu_variant_list, i, v) |
638eeae8 | 3594 | if (gnu_context == v->type |
44e9e3ec EB |
3595 | || ((rep_part = get_rep_part (v->type)) |
3596 | && gnu_context == TREE_TYPE (rep_part))) | |
3597 | break; | |
3598 | if (v) | |
95c1c4bb EB |
3599 | { |
3600 | if (selected_variant) | |
3601 | gnu_cont_type = gnu_type; | |
3602 | else | |
82ea8185 | 3603 | gnu_cont_type = v->new_type; |
95c1c4bb EB |
3604 | } |
3605 | else | |
3606 | /* The front-end may pass us "ghost" components if | |
3607 | it fails to recognize that a constrained subtype | |
3608 | is statically constrained. Discard them. */ | |
a1ab4c31 AC |
3609 | continue; |
3610 | } | |
3611 | ||
95c1c4bb | 3612 | /* Now create the new field modeled on the old one. */ |
a1ab4c31 | 3613 | gnu_field |
95c1c4bb EB |
3614 | = create_field_decl_from (gnu_old_field, gnu_field_type, |
3615 | gnu_cont_type, gnu_size, | |
3616 | gnu_pos_list, gnu_subst_list); | |
44e9e3ec | 3617 | gnu_pos = DECL_FIELD_OFFSET (gnu_field); |
a1ab4c31 | 3618 | |
95c1c4bb EB |
3619 | /* Put it in one of the new variants directly. */ |
3620 | if (gnu_cont_type != gnu_type) | |
a1ab4c31 | 3621 | { |
910ad8de | 3622 | DECL_CHAIN (gnu_field) = TYPE_FIELDS (gnu_cont_type); |
95c1c4bb | 3623 | TYPE_FIELDS (gnu_cont_type) = gnu_field; |
a1ab4c31 AC |
3624 | } |
3625 | ||
a6a29d0c EB |
3626 | /* To match the layout crafted in components_to_record, |
3627 | if this is the _Tag or _Parent field, put it before | |
3628 | any other fields. */ | |
95c1c4bb EB |
3629 | else if (gnat_name == Name_uTag |
3630 | || gnat_name == Name_uParent) | |
13318d2f | 3631 | gnu_field_list = chainon (gnu_field_list, gnu_field); |
a6a29d0c EB |
3632 | |
3633 | /* Similarly, if this is the _Controller field, put | |
3634 | it before the other fields except for the _Tag or | |
3635 | _Parent field. */ | |
3636 | else if (gnat_name == Name_uController && gnu_last) | |
3637 | { | |
e3edbd56 EB |
3638 | DECL_CHAIN (gnu_field) = DECL_CHAIN (gnu_last); |
3639 | DECL_CHAIN (gnu_last) = gnu_field; | |
a6a29d0c EB |
3640 | } |
3641 | ||
3642 | /* Otherwise, if this is a regular field, put it after | |
3643 | the other fields. */ | |
13318d2f EB |
3644 | else |
3645 | { | |
910ad8de | 3646 | DECL_CHAIN (gnu_field) = gnu_field_list; |
13318d2f | 3647 | gnu_field_list = gnu_field; |
a6a29d0c EB |
3648 | if (!gnu_last) |
3649 | gnu_last = gnu_field; | |
44e9e3ec EB |
3650 | if (TREE_CODE (gnu_pos) != INTEGER_CST) |
3651 | all_constant_pos = false; | |
13318d2f EB |
3652 | } |
3653 | ||
a1ab4c31 AC |
3654 | save_gnu_tree (gnat_field, gnu_field, false); |
3655 | } | |
3656 | ||
44e9e3ec EB |
3657 | /* If there is a variant list, a selected variant and the fields |
3658 | all have a constant position, put them in order of increasing | |
3659 | position to match that of constant CONSTRUCTORs. Likewise if | |
3660 | there is no variant list but a REP part, since the latter has | |
3661 | been flattened in the process. */ | |
3662 | if (((gnu_variant_list.exists () && selected_variant) | |
3663 | || (!gnu_variant_list.exists () && gnu_rep_part)) | |
3664 | && all_constant_pos) | |
3665 | { | |
3666 | const int len = list_length (gnu_field_list); | |
3667 | tree *field_arr = XALLOCAVEC (tree, len), t; | |
3668 | int i; | |
3669 | ||
3670 | for (t = gnu_field_list, i = 0; t; t = DECL_CHAIN (t), i++) | |
3671 | field_arr[i] = t; | |
3672 | ||
3673 | qsort (field_arr, len, sizeof (tree), compare_field_bitpos); | |
3674 | ||
3675 | gnu_field_list = NULL_TREE; | |
3676 | for (i = 0; i < len; i++) | |
3677 | { | |
3678 | DECL_CHAIN (field_arr[i]) = gnu_field_list; | |
3679 | gnu_field_list = field_arr[i]; | |
3680 | } | |
3681 | } | |
3682 | ||
95c1c4bb EB |
3683 | /* If there is a variant list and no selected variant, we need |
3684 | to create the nest of variant parts from the old nest. */ | |
44e9e3ec | 3685 | else if (gnu_variant_list.exists () && !selected_variant) |
95c1c4bb EB |
3686 | { |
3687 | tree new_variant_part | |
3688 | = create_variant_part_from (gnu_variant_part, | |
3689 | gnu_variant_list, gnu_type, | |
3690 | gnu_pos_list, gnu_subst_list); | |
910ad8de | 3691 | DECL_CHAIN (new_variant_part) = gnu_field_list; |
95c1c4bb EB |
3692 | gnu_field_list = new_variant_part; |
3693 | } | |
3694 | ||
a1ab4c31 AC |
3695 | /* Now go through the entities again looking for Itypes that |
3696 | we have not elaborated but should (e.g., Etypes of fields | |
3697 | that have Original_Components). */ | |
3698 | for (gnat_field = First_Entity (gnat_entity); | |
3699 | Present (gnat_field); gnat_field = Next_Entity (gnat_field)) | |
3700 | if ((Ekind (gnat_field) == E_Discriminant | |
3701 | || Ekind (gnat_field) == E_Component) | |
3702 | && !present_gnu_tree (Etype (gnat_field))) | |
3703 | gnat_to_gnu_entity (Etype (gnat_field), NULL_TREE, 0); | |
3704 | ||
032d1b71 EB |
3705 | /* Do not emit debug info for the type yet since we're going to |
3706 | modify it below. */ | |
f54ee980 EB |
3707 | finish_record_type (gnu_type, nreverse (gnu_field_list), 2, |
3708 | false); | |
1a19a3e4 | 3709 | compute_record_mode (gnu_type); |
a1ab4c31 | 3710 | |
a1ab4c31 AC |
3711 | /* Fill in locations of fields. */ |
3712 | annotate_rep (gnat_entity, gnu_type); | |
3713 | ||
986ccd21 PMR |
3714 | /* If debugging information is being written for the type and if |
3715 | we are asked to output such encodings, write a record that | |
3716 | shows what we are a subtype of and also make a variable that | |
3717 | indicates our size, if still variable. */ | |
3718 | if (gnat_encodings != DWARF_GNAT_ENCODINGS_MINIMAL) | |
a1ab4c31 AC |
3719 | { |
3720 | tree gnu_subtype_marker = make_node (RECORD_TYPE); | |
9dba4b55 PC |
3721 | tree gnu_unpad_base_name |
3722 | = TYPE_IDENTIFIER (gnu_unpad_base_type); | |
e9cfc9b5 | 3723 | tree gnu_size_unit = TYPE_SIZE_UNIT (gnu_type); |
a1ab4c31 | 3724 | |
a1ab4c31 AC |
3725 | TYPE_NAME (gnu_subtype_marker) |
3726 | = create_concat_name (gnat_entity, "XVS"); | |
3727 | finish_record_type (gnu_subtype_marker, | |
c244bf8f EB |
3728 | create_field_decl (gnu_unpad_base_name, |
3729 | build_reference_type | |
3730 | (gnu_unpad_base_type), | |
a1ab4c31 | 3731 | gnu_subtype_marker, |
da01bfee EB |
3732 | NULL_TREE, NULL_TREE, |
3733 | 0, 0), | |
032d1b71 | 3734 | 0, true); |
a1ab4c31 | 3735 | |
a5695aa2 | 3736 | add_parallel_type (gnu_type, gnu_subtype_marker); |
e9cfc9b5 EB |
3737 | |
3738 | if (definition | |
3739 | && TREE_CODE (gnu_size_unit) != INTEGER_CST | |
3740 | && !CONTAINS_PLACEHOLDER_P (gnu_size_unit)) | |
b5bba4a6 EB |
3741 | TYPE_SIZE_UNIT (gnu_subtype_marker) |
3742 | = create_var_decl (create_concat_name (gnat_entity, | |
3743 | "XVZ"), | |
3744 | NULL_TREE, sizetype, gnu_size_unit, | |
2056c5ed EB |
3745 | false, false, false, false, false, |
3746 | true, debug_info_p, | |
3747 | NULL, gnat_entity); | |
a1ab4c31 AC |
3748 | } |
3749 | ||
9771b263 DN |
3750 | gnu_variant_list.release (); |
3751 | gnu_subst_list.release (); | |
e3554601 | 3752 | |
a1ab4c31 AC |
3753 | /* Now we can finalize it. */ |
3754 | rest_of_record_type_compilation (gnu_type); | |
3755 | } | |
3756 | ||
8cd28148 EB |
3757 | /* Otherwise, go down all the components in the new type and make |
3758 | them equivalent to those in the base type. */ | |
a1ab4c31 | 3759 | else |
8cd28148 | 3760 | { |
c244bf8f | 3761 | gnu_type = gnu_base_type; |
8cd28148 EB |
3762 | |
3763 | for (gnat_temp = First_Entity (gnat_entity); | |
3764 | Present (gnat_temp); | |
3765 | gnat_temp = Next_Entity (gnat_temp)) | |
3766 | if ((Ekind (gnat_temp) == E_Discriminant | |
3767 | && !Is_Unchecked_Union (gnat_base_type)) | |
3768 | || Ekind (gnat_temp) == E_Component) | |
3769 | save_gnu_tree (gnat_temp, | |
3770 | gnat_to_gnu_field_decl | |
3771 | (Original_Record_Component (gnat_temp)), | |
3772 | false); | |
3773 | } | |
a1ab4c31 AC |
3774 | } |
3775 | break; | |
3776 | ||
3777 | case E_Access_Subprogram_Type: | |
3778 | /* Use the special descriptor type for dispatch tables if needed, | |
3779 | that is to say for the Prim_Ptr of a-tags.ads and its clones. | |
3780 | Note that we are only required to do so for static tables in | |
3781 | order to be compatible with the C++ ABI, but Ada 2005 allows | |
3782 | to extend library level tagged types at the local level so | |
3783 | we do it in the non-static case as well. */ | |
3784 | if (TARGET_VTABLE_USES_DESCRIPTORS | |
3785 | && Is_Dispatch_Table_Entity (gnat_entity)) | |
3786 | { | |
3787 | gnu_type = fdesc_type_node; | |
3788 | gnu_size = TYPE_SIZE (gnu_type); | |
3789 | break; | |
3790 | } | |
3791 | ||
3792 | /* ... fall through ... */ | |
3793 | ||
3794 | case E_Anonymous_Access_Subprogram_Type: | |
3795 | /* If we are not defining this entity, and we have incomplete | |
3796 | entities being processed above us, make a dummy type and | |
3797 | fill it in later. */ | |
3798 | if (!definition && defer_incomplete_level != 0) | |
3799 | { | |
dee12fcd | 3800 | struct incomplete *p = XNEW (struct incomplete); |
a1ab4c31 AC |
3801 | |
3802 | gnu_type | |
3803 | = build_pointer_type | |
3804 | (make_dummy_type (Directly_Designated_Type (gnat_entity))); | |
74746d49 | 3805 | gnu_decl = create_type_decl (gnu_entity_name, gnu_type, |
c1a569ef EB |
3806 | artificial_p, debug_info_p, |
3807 | gnat_entity); | |
a1ab4c31 AC |
3808 | this_made_decl = true; |
3809 | gnu_type = TREE_TYPE (gnu_decl); | |
3810 | save_gnu_tree (gnat_entity, gnu_decl, false); | |
3811 | saved = true; | |
3812 | ||
3813 | p->old_type = TREE_TYPE (gnu_type); | |
3814 | p->full_type = Directly_Designated_Type (gnat_entity); | |
3815 | p->next = defer_incomplete_list; | |
3816 | defer_incomplete_list = p; | |
3817 | break; | |
3818 | } | |
3819 | ||
3820 | /* ... fall through ... */ | |
3821 | ||
3822 | case E_Allocator_Type: | |
3823 | case E_Access_Type: | |
3824 | case E_Access_Attribute_Type: | |
3825 | case E_Anonymous_Access_Type: | |
3826 | case E_General_Access_Type: | |
3827 | { | |
d0c26312 | 3828 | /* The designated type and its equivalent type for gigi. */ |
a1ab4c31 AC |
3829 | Entity_Id gnat_desig_type = Directly_Designated_Type (gnat_entity); |
3830 | Entity_Id gnat_desig_equiv = Gigi_Equivalent_Type (gnat_desig_type); | |
d0c26312 | 3831 | /* Whether it comes from a limited with. */ |
a1ab4c31 AC |
3832 | bool is_from_limited_with |
3833 | = (IN (Ekind (gnat_desig_equiv), Incomplete_Kind) | |
7b56a91b | 3834 | && From_Limited_With (gnat_desig_equiv)); |
d0c26312 | 3835 | /* The "full view" of the designated type. If this is an incomplete |
a1ab4c31 AC |
3836 | entity from a limited with, treat its non-limited view as the full |
3837 | view. Otherwise, if this is an incomplete or private type, use the | |
3838 | full view. In the former case, we might point to a private type, | |
3839 | in which case, we need its full view. Also, we want to look at the | |
3840 | actual type used for the representation, so this takes a total of | |
3841 | three steps. */ | |
3842 | Entity_Id gnat_desig_full_direct_first | |
d0c26312 EB |
3843 | = (is_from_limited_with |
3844 | ? Non_Limited_View (gnat_desig_equiv) | |
a1ab4c31 AC |
3845 | : (IN (Ekind (gnat_desig_equiv), Incomplete_Or_Private_Kind) |
3846 | ? Full_View (gnat_desig_equiv) : Empty)); | |
3847 | Entity_Id gnat_desig_full_direct | |
3848 | = ((is_from_limited_with | |
3849 | && Present (gnat_desig_full_direct_first) | |
3850 | && IN (Ekind (gnat_desig_full_direct_first), Private_Kind)) | |
3851 | ? Full_View (gnat_desig_full_direct_first) | |
3852 | : gnat_desig_full_direct_first); | |
3853 | Entity_Id gnat_desig_full | |
3854 | = Gigi_Equivalent_Type (gnat_desig_full_direct); | |
d0c26312 EB |
3855 | /* The type actually used to represent the designated type, either |
3856 | gnat_desig_full or gnat_desig_equiv. */ | |
a1ab4c31 | 3857 | Entity_Id gnat_desig_rep; |
a1ab4c31 AC |
3858 | /* We want to know if we'll be seeing the freeze node for any |
3859 | incomplete type we may be pointing to. */ | |
3860 | bool in_main_unit | |
3861 | = (Present (gnat_desig_full) | |
3862 | ? In_Extended_Main_Code_Unit (gnat_desig_full) | |
3863 | : In_Extended_Main_Code_Unit (gnat_desig_type)); | |
1e17ef87 | 3864 | /* True if we make a dummy type here. */ |
a1ab4c31 | 3865 | bool made_dummy = false; |
d0c26312 | 3866 | /* The mode to be used for the pointer type. */ |
ef4bddc2 | 3867 | machine_mode p_mode = mode_for_size (esize, MODE_INT, 0); |
d0c26312 EB |
3868 | /* The GCC type used for the designated type. */ |
3869 | tree gnu_desig_type = NULL_TREE; | |
a1ab4c31 AC |
3870 | |
3871 | if (!targetm.valid_pointer_mode (p_mode)) | |
3872 | p_mode = ptr_mode; | |
3873 | ||
3874 | /* If either the designated type or its full view is an unconstrained | |
3875 | array subtype, replace it with the type it's a subtype of. This | |
3876 | avoids problems with multiple copies of unconstrained array types. | |
3877 | Likewise, if the designated type is a subtype of an incomplete | |
3878 | record type, use the parent type to avoid order of elaboration | |
3879 | issues. This can lose some code efficiency, but there is no | |
3880 | alternative. */ | |
3881 | if (Ekind (gnat_desig_equiv) == E_Array_Subtype | |
d0c26312 | 3882 | && !Is_Constrained (gnat_desig_equiv)) |
a1ab4c31 AC |
3883 | gnat_desig_equiv = Etype (gnat_desig_equiv); |
3884 | if (Present (gnat_desig_full) | |
3885 | && ((Ekind (gnat_desig_full) == E_Array_Subtype | |
d0c26312 | 3886 | && !Is_Constrained (gnat_desig_full)) |
a1ab4c31 AC |
3887 | || (Ekind (gnat_desig_full) == E_Record_Subtype |
3888 | && Ekind (Etype (gnat_desig_full)) == E_Record_Type))) | |
3889 | gnat_desig_full = Etype (gnat_desig_full); | |
3890 | ||
8ea456b9 | 3891 | /* Set the type that's the representation of the designated type. */ |
d0c26312 EB |
3892 | gnat_desig_rep |
3893 | = Present (gnat_desig_full) ? gnat_desig_full : gnat_desig_equiv; | |
a1ab4c31 AC |
3894 | |
3895 | /* If we already know what the full type is, use it. */ | |
8ea456b9 | 3896 | if (Present (gnat_desig_full) && present_gnu_tree (gnat_desig_full)) |
a1ab4c31 AC |
3897 | gnu_desig_type = TREE_TYPE (get_gnu_tree (gnat_desig_full)); |
3898 | ||
d0c26312 EB |
3899 | /* Get the type of the thing we are to point to and build a pointer to |
3900 | it. If it is a reference to an incomplete or private type with a | |
8ea456b9 EB |
3901 | full view that is a record or an array, make a dummy type node and |
3902 | get the actual type later when we have verified it is safe. */ | |
d0c26312 EB |
3903 | else if ((!in_main_unit |
3904 | && !present_gnu_tree (gnat_desig_equiv) | |
a1ab4c31 | 3905 | && Present (gnat_desig_full) |
8ea456b9 EB |
3906 | && (Is_Record_Type (gnat_desig_full) |
3907 | || Is_Array_Type (gnat_desig_full))) | |
d0c26312 EB |
3908 | /* Likewise if we are pointing to a record or array and we are |
3909 | to defer elaborating incomplete types. We do this as this | |
8ea456b9 | 3910 | access type may be the full view of a private type. */ |
d0c26312 | 3911 | || ((!in_main_unit || imported_p) |
a10623fb | 3912 | && defer_incomplete_level != 0 |
d0c26312 EB |
3913 | && !present_gnu_tree (gnat_desig_equiv) |
3914 | && (Is_Record_Type (gnat_desig_rep) | |
3915 | || Is_Array_Type (gnat_desig_rep))) | |
a1ab4c31 | 3916 | /* If this is a reference from a limited_with type back to our |
d0c26312 | 3917 | main unit and there's a freeze node for it, either we have |
a1ab4c31 AC |
3918 | already processed the declaration and made the dummy type, |
3919 | in which case we just reuse the latter, or we have not yet, | |
3920 | in which case we make the dummy type and it will be reused | |
d0c26312 EB |
3921 | when the declaration is finally processed. In both cases, |
3922 | the pointer eventually created below will be automatically | |
8ea456b9 EB |
3923 | adjusted when the freeze node is processed. */ |
3924 | || (in_main_unit | |
3925 | && is_from_limited_with | |
3926 | && Present (Freeze_Node (gnat_desig_rep)))) | |
a1ab4c31 AC |
3927 | { |
3928 | gnu_desig_type = make_dummy_type (gnat_desig_equiv); | |
3929 | made_dummy = true; | |
3930 | } | |
3931 | ||
3932 | /* Otherwise handle the case of a pointer to itself. */ | |
3933 | else if (gnat_desig_equiv == gnat_entity) | |
3934 | { | |
3935 | gnu_type | |
3936 | = build_pointer_type_for_mode (void_type_node, p_mode, | |
3937 | No_Strict_Aliasing (gnat_entity)); | |
3938 | TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type) = gnu_type; | |
3939 | } | |
3940 | ||
d0c26312 EB |
3941 | /* If expansion is disabled, the equivalent type of a concurrent type |
3942 | is absent, so build a dummy pointer type. */ | |
a1ab4c31 | 3943 | else if (type_annotate_only && No (gnat_desig_equiv)) |
1366ba41 | 3944 | gnu_type = ptr_type_node; |
a1ab4c31 | 3945 | |
d0c26312 EB |
3946 | /* Finally, handle the default case where we can just elaborate our |
3947 | designated type. */ | |
a1ab4c31 AC |
3948 | else |
3949 | gnu_desig_type = gnat_to_gnu_type (gnat_desig_equiv); | |
3950 | ||
3951 | /* It is possible that a call to gnat_to_gnu_type above resolved our | |
3952 | type. If so, just return it. */ | |
3953 | if (present_gnu_tree (gnat_entity)) | |
3954 | { | |
3955 | maybe_present = true; | |
3956 | break; | |
3957 | } | |
3958 | ||
8ea456b9 EB |
3959 | /* For an unconstrained array, make dummy fat & thin pointer types. */ |
3960 | if (Is_Array_Type (gnat_desig_rep) && !Is_Constrained (gnat_desig_rep)) | |
3961 | { | |
3962 | /* If the processing above got something that has a pointer, then | |
3963 | we are done. This could have happened either because the type | |
3964 | was elaborated or because somebody else executed the code. */ | |
3965 | if (!TYPE_POINTER_TO (gnu_desig_type)) | |
3966 | build_dummy_unc_pointer_types (gnat_desig_equiv, gnu_desig_type); | |
3967 | gnu_type = TYPE_POINTER_TO (gnu_desig_type); | |
3968 | } | |
3969 | ||
1228a6a6 | 3970 | /* If we haven't done it yet, build the pointer type the usual way. */ |
8ea456b9 | 3971 | else if (!gnu_type) |
a1ab4c31 | 3972 | { |
d0c26312 EB |
3973 | /* Modify the designated type if we are pointing only to constant |
3974 | objects, but don't do it for unconstrained arrays. */ | |
a1ab4c31 AC |
3975 | if (Is_Access_Constant (gnat_entity) |
3976 | && TREE_CODE (gnu_desig_type) != UNCONSTRAINED_ARRAY_TYPE) | |
3977 | { | |
3978 | gnu_desig_type | |
4aecc2f8 | 3979 | = change_qualified_type (gnu_desig_type, TYPE_QUAL_CONST); |
a1ab4c31 AC |
3980 | |
3981 | /* Some extra processing is required if we are building a | |
2ddc34ba | 3982 | pointer to an incomplete type (in the GCC sense). We might |
a1ab4c31 AC |
3983 | have such a type if we just made a dummy, or directly out |
3984 | of the call to gnat_to_gnu_type above if we are processing | |
3985 | an access type for a record component designating the | |
3986 | record type itself. */ | |
3987 | if (TYPE_MODE (gnu_desig_type) == VOIDmode) | |
3988 | { | |
3989 | /* We must ensure that the pointer to variant we make will | |
3990 | be processed by update_pointer_to when the initial type | |
2ddc34ba | 3991 | is completed. Pretend we made a dummy and let further |
a1ab4c31 AC |
3992 | processing act as usual. */ |
3993 | made_dummy = true; | |
3994 | ||
3995 | /* We must ensure that update_pointer_to will not retrieve | |
3996 | the dummy variant when building a properly qualified | |
2ddc34ba | 3997 | version of the complete type. We take advantage of the |
a1ab4c31 AC |
3998 | fact that get_qualified_type is requiring TYPE_NAMEs to |
3999 | match to influence build_qualified_type and then also | |
2ddc34ba | 4000 | update_pointer_to here. */ |
a1ab4c31 AC |
4001 | TYPE_NAME (gnu_desig_type) |
4002 | = create_concat_name (gnat_desig_type, "INCOMPLETE_CST"); | |
4003 | } | |
4004 | } | |
4005 | ||
4006 | gnu_type | |
4007 | = build_pointer_type_for_mode (gnu_desig_type, p_mode, | |
4008 | No_Strict_Aliasing (gnat_entity)); | |
4009 | } | |
4010 | ||
d0c26312 | 4011 | /* If we are not defining this object and we have made a dummy pointer, |
a1ab4c31 AC |
4012 | save our current definition, evaluate the actual type, and replace |
4013 | the tentative type we made with the actual one. If we are to defer | |
d0c26312 | 4014 | actually looking up the actual type, make an entry in the deferred |
6ddf9843 EB |
4015 | list. If this is from a limited with, we may have to defer to the |
4016 | end of the current unit. */ | |
d0c26312 | 4017 | if ((!in_main_unit || is_from_limited_with) && made_dummy) |
a1ab4c31 | 4018 | { |
e3edbd56 | 4019 | tree gnu_old_desig_type; |
a1ab4c31 | 4020 | |
e3edbd56 EB |
4021 | if (TYPE_IS_FAT_POINTER_P (gnu_type)) |
4022 | { | |
4023 | gnu_old_desig_type = TYPE_UNCONSTRAINED_ARRAY (gnu_type); | |
4024 | if (esize == POINTER_SIZE) | |
4025 | gnu_type = build_pointer_type | |
4026 | (TYPE_OBJECT_RECORD_TYPE (gnu_old_desig_type)); | |
4027 | } | |
4028 | else | |
4029 | gnu_old_desig_type = TREE_TYPE (gnu_type); | |
a1ab4c31 | 4030 | |
74746d49 EB |
4031 | process_attributes (&gnu_type, &attr_list, false, gnat_entity); |
4032 | gnu_decl = create_type_decl (gnu_entity_name, gnu_type, | |
c1a569ef EB |
4033 | artificial_p, debug_info_p, |
4034 | gnat_entity); | |
a1ab4c31 AC |
4035 | this_made_decl = true; |
4036 | gnu_type = TREE_TYPE (gnu_decl); | |
4037 | save_gnu_tree (gnat_entity, gnu_decl, false); | |
4038 | saved = true; | |
4039 | ||
d0c26312 EB |
4040 | /* Note that the call to gnat_to_gnu_type on gnat_desig_equiv might |
4041 | update gnu_old_desig_type directly, in which case it will not be | |
4042 | a dummy type any more when we get into update_pointer_to. | |
a1ab4c31 | 4043 | |
d0c26312 EB |
4044 | This can happen e.g. when the designated type is a record type, |
4045 | because their elaboration starts with an initial node from | |
4046 | make_dummy_type, which may be the same node as the one we got. | |
a1ab4c31 | 4047 | |
d0c26312 EB |
4048 | Besides, variants of this non-dummy type might have been created |
4049 | along the way. update_pointer_to is expected to properly take | |
4050 | care of those situations. */ | |
6ddf9843 | 4051 | if (defer_incomplete_level == 0 && !is_from_limited_with) |
80ec8b4c | 4052 | { |
80ec8b4c EB |
4053 | update_pointer_to (TYPE_MAIN_VARIANT (gnu_old_desig_type), |
4054 | gnat_to_gnu_type (gnat_desig_equiv)); | |
80ec8b4c | 4055 | } |
a1ab4c31 AC |
4056 | else |
4057 | { | |
d0c26312 | 4058 | struct incomplete *p = XNEW (struct incomplete); |
a1ab4c31 | 4059 | struct incomplete **head |
6ddf9843 | 4060 | = (is_from_limited_with |
a1ab4c31 | 4061 | ? &defer_limited_with : &defer_incomplete_list); |
d0c26312 | 4062 | p->old_type = gnu_old_desig_type; |
a1ab4c31 AC |
4063 | p->full_type = gnat_desig_equiv; |
4064 | p->next = *head; | |
4065 | *head = p; | |
4066 | } | |
4067 | } | |
4068 | } | |
4069 | break; | |
4070 | ||
4071 | case E_Access_Protected_Subprogram_Type: | |
4072 | case E_Anonymous_Access_Protected_Subprogram_Type: | |
4073 | if (type_annotate_only && No (gnat_equiv_type)) | |
1366ba41 | 4074 | gnu_type = ptr_type_node; |
a1ab4c31 AC |
4075 | else |
4076 | { | |
c01fe451 | 4077 | /* The run-time representation is the equivalent type. */ |
a1ab4c31 | 4078 | gnu_type = gnat_to_gnu_type (gnat_equiv_type); |
2ddc34ba | 4079 | maybe_present = true; |
a1ab4c31 AC |
4080 | } |
4081 | ||
4082 | if (Is_Itype (Directly_Designated_Type (gnat_entity)) | |
4083 | && !present_gnu_tree (Directly_Designated_Type (gnat_entity)) | |
4084 | && No (Freeze_Node (Directly_Designated_Type (gnat_entity))) | |
4085 | && !Is_Record_Type (Scope (Directly_Designated_Type (gnat_entity)))) | |
4086 | gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity), | |
4087 | NULL_TREE, 0); | |
4088 | ||
4089 | break; | |
4090 | ||
4091 | case E_Access_Subtype: | |
4092 | ||
4093 | /* We treat this as identical to its base type; any constraint is | |
dee12fcd | 4094 | meaningful only to the front-end. |
a1ab4c31 AC |
4095 | |
4096 | The designated type must be elaborated as well, if it does | |
2ddc34ba | 4097 | not have its own freeze node. Designated (sub)types created |
a1ab4c31 | 4098 | for constrained components of records with discriminants are |
dee12fcd | 4099 | not frozen by the front-end and thus not elaborated by gigi, |
a1ab4c31 AC |
4100 | because their use may appear before the base type is frozen, |
4101 | and because it is not clear that they are needed anywhere in | |
dee12fcd | 4102 | gigi. With the current model, there is no correct place where |
a1ab4c31 AC |
4103 | they could be elaborated. */ |
4104 | ||
4105 | gnu_type = gnat_to_gnu_type (Etype (gnat_entity)); | |
4106 | if (Is_Itype (Directly_Designated_Type (gnat_entity)) | |
4107 | && !present_gnu_tree (Directly_Designated_Type (gnat_entity)) | |
4108 | && Is_Frozen (Directly_Designated_Type (gnat_entity)) | |
4109 | && No (Freeze_Node (Directly_Designated_Type (gnat_entity)))) | |
4110 | { | |
4111 | /* If we are not defining this entity, and we have incomplete | |
4112 | entities being processed above us, make a dummy type and | |
4113 | elaborate it later. */ | |
4114 | if (!definition && defer_incomplete_level != 0) | |
4115 | { | |
dee12fcd | 4116 | struct incomplete *p = XNEW (struct incomplete); |
a1ab4c31 | 4117 | |
dee12fcd EB |
4118 | p->old_type |
4119 | = make_dummy_type (Directly_Designated_Type (gnat_entity)); | |
a1ab4c31 AC |
4120 | p->full_type = Directly_Designated_Type (gnat_entity); |
4121 | p->next = defer_incomplete_list; | |
4122 | defer_incomplete_list = p; | |
4123 | } | |
4124 | else if (!IN (Ekind (Base_Type | |
dee12fcd EB |
4125 | (Directly_Designated_Type (gnat_entity))), |
4126 | Incomplete_Or_Private_Kind)) | |
a1ab4c31 AC |
4127 | gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity), |
4128 | NULL_TREE, 0); | |
4129 | } | |
4130 | ||
4131 | maybe_present = true; | |
4132 | break; | |
4133 | ||
4134 | /* Subprogram Entities | |
4135 | ||
c9d84d0e | 4136 | The following access functions are defined for subprograms: |
a1ab4c31 | 4137 | |
c9d84d0e | 4138 | Etype Return type or Standard_Void_Type. |
a1ab4c31 AC |
4139 | First_Formal The first formal parameter. |
4140 | Is_Imported Indicates that the subprogram has appeared in | |
2ddc34ba | 4141 | an INTERFACE or IMPORT pragma. For now we |
a1ab4c31 AC |
4142 | assume that the external language is C. |
4143 | Is_Exported Likewise but for an EXPORT pragma. | |
4144 | Is_Inlined True if the subprogram is to be inlined. | |
4145 | ||
a1ab4c31 AC |
4146 | Each parameter is first checked by calling must_pass_by_ref on its |
4147 | type to determine if it is passed by reference. For parameters which | |
4148 | are copied in, if they are Ada In Out or Out parameters, their return | |
4149 | value becomes part of a record which becomes the return type of the | |
4150 | function (C function - note that this applies only to Ada procedures | |
2ddc34ba | 4151 | so there is no Ada return type). Additional code to store back the |
a1ab4c31 AC |
4152 | parameters will be generated on the caller side. This transformation |
4153 | is done here, not in the front-end. | |
4154 | ||
4155 | The intended result of the transformation can be seen from the | |
4156 | equivalent source rewritings that follow: | |
4157 | ||
4158 | struct temp {int a,b}; | |
4159 | procedure P (A,B: In Out ...) is temp P (int A,B) | |
4160 | begin { | |
4161 | .. .. | |
4162 | end P; return {A,B}; | |
4163 | } | |
4164 | ||
4165 | temp t; | |
4166 | P(X,Y); t = P(X,Y); | |
4167 | X = t.a , Y = t.b; | |
4168 | ||
4169 | For subprogram types we need to perform mainly the same conversions to | |
4170 | GCC form that are needed for procedures and function declarations. The | |
4171 | only difference is that at the end, we make a type declaration instead | |
4172 | of a function declaration. */ | |
4173 | ||
4174 | case E_Subprogram_Type: | |
4175 | case E_Function: | |
4176 | case E_Procedure: | |
4177 | { | |
c9d84d0e EB |
4178 | /* The type returned by a function or else Standard_Void_Type for a |
4179 | procedure. */ | |
4180 | Entity_Id gnat_return_type = Etype (gnat_entity); | |
4181 | tree gnu_return_type; | |
a1ab4c31 | 4182 | /* The first GCC parameter declaration (a PARM_DECL node). The |
e3edbd56 | 4183 | PARM_DECL nodes are chained through the DECL_CHAIN field, so this |
a1ab4c31 AC |
4184 | actually is the head of this parameter list. */ |
4185 | tree gnu_param_list = NULL_TREE; | |
a1ab4c31 AC |
4186 | /* Non-null for subprograms containing parameters passed by copy-in |
4187 | copy-out (Ada In Out or Out parameters not passed by reference), | |
d47d0a8d EB |
4188 | in which case it is the list of nodes used to specify the values |
4189 | of the In Out/Out parameters that are returned as a record upon | |
a1ab4c31 AC |
4190 | procedure return. The TREE_PURPOSE of an element of this list is |
4191 | a field of the record and the TREE_VALUE is the PARM_DECL | |
4192 | corresponding to that field. This list will be saved in the | |
4193 | TYPE_CI_CO_LIST field of the FUNCTION_TYPE node we create. */ | |
d47d0a8d | 4194 | tree gnu_cico_list = NULL_TREE; |
c9d84d0e EB |
4195 | /* List of fields in return type of procedure with copy-in copy-out |
4196 | parameters. */ | |
4197 | tree gnu_field_list = NULL_TREE; | |
a1ab4c31 AC |
4198 | /* If an import pragma asks to map this subprogram to a GCC builtin, |
4199 | this is the builtin DECL node. */ | |
4200 | tree gnu_builtin_decl = NULL_TREE; | |
a1ab4c31 AC |
4201 | tree gnu_ext_name = create_concat_name (gnat_entity, NULL); |
4202 | Entity_Id gnat_param; | |
0e24192c EB |
4203 | enum inline_status_t inline_status |
4204 | = Has_Pragma_No_Inline (gnat_entity) | |
4205 | ? is_suppressed | |
384e3fb1 JM |
4206 | : Has_Pragma_Inline_Always (gnat_entity) |
4207 | ? is_required | |
4208 | : (Is_Inlined (gnat_entity) ? is_enabled : is_disabled); | |
a1ab4c31 | 4209 | bool public_flag = Is_Public (gnat_entity) || imported_p; |
5865a63d AC |
4210 | /* Subprograms marked both Intrinsic and Always_Inline need not |
4211 | have a body of their own. */ | |
a1ab4c31 | 4212 | bool extern_flag |
5865a63d AC |
4213 | = ((Is_Public (gnat_entity) && !definition) |
4214 | || imported_p | |
4215 | || (Convention (gnat_entity) == Convention_Intrinsic | |
4216 | && Has_Pragma_Inline_Always (gnat_entity))); | |
255e5b04 OH |
4217 | /* The semantics of "pure" in Ada essentially matches that of "const" |
4218 | in the back-end. In particular, both properties are orthogonal to | |
4219 | the "nothrow" property if the EH circuitry is explicit in the | |
4220 | internal representation of the back-end. If we are to completely | |
4221 | hide the EH circuitry from it, we need to declare that calls to pure | |
4222 | Ada subprograms that can throw have side effects since they can | |
4223 | trigger an "abnormal" transfer of control flow; thus they can be | |
4224 | neither "const" nor "pure" in the back-end sense. */ | |
2056c5ed EB |
4225 | bool const_flag = (Back_End_Exceptions () && Is_Pure (gnat_entity)); |
4226 | bool volatile_flag = No_Return (gnat_entity); | |
d47d0a8d EB |
4227 | bool return_by_direct_ref_p = false; |
4228 | bool return_by_invisi_ref_p = false; | |
4229 | bool return_unconstrained_p = false; | |
a1ab4c31 AC |
4230 | int parmnum; |
4231 | ||
8cd28148 EB |
4232 | /* A parameter may refer to this type, so defer completion of any |
4233 | incomplete types. */ | |
a1ab4c31 | 4234 | if (kind == E_Subprogram_Type && !definition) |
8cd28148 EB |
4235 | { |
4236 | defer_incomplete_level++; | |
4237 | this_deferred = true; | |
4238 | } | |
a1ab4c31 AC |
4239 | |
4240 | /* If the subprogram has an alias, it is probably inherited, so | |
4241 | we can use the original one. If the original "subprogram" | |
4242 | is actually an enumeration literal, it may be the first use | |
4243 | of its type, so we must elaborate that type now. */ | |
4244 | if (Present (Alias (gnat_entity))) | |
4245 | { | |
1d4b96e0 AC |
4246 | const Entity_Id gnat_renamed = Renamed_Object (gnat_entity); |
4247 | ||
a1ab4c31 AC |
4248 | if (Ekind (Alias (gnat_entity)) == E_Enumeration_Literal) |
4249 | gnat_to_gnu_entity (Etype (Alias (gnat_entity)), NULL_TREE, 0); | |
4250 | ||
c9d84d0e | 4251 | gnu_decl = gnat_to_gnu_entity (Alias (gnat_entity), gnu_expr, 0); |
a1ab4c31 AC |
4252 | |
4253 | /* Elaborate any Itypes in the parameters of this entity. */ | |
4254 | for (gnat_temp = First_Formal_With_Extras (gnat_entity); | |
4255 | Present (gnat_temp); | |
4256 | gnat_temp = Next_Formal_With_Extras (gnat_temp)) | |
4257 | if (Is_Itype (Etype (gnat_temp))) | |
4258 | gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0); | |
4259 | ||
1d4b96e0 AC |
4260 | /* Materialize renamed subprograms in the debugging information |
4261 | when the renamed object is compile time known. We can consider | |
4262 | such renamings as imported declarations. | |
4263 | ||
4264 | Because the parameters in generics instantiation are generally | |
4265 | materialized as renamings, we ofter end up having both the | |
4266 | renamed subprogram and the renaming in the same context and with | |
4267 | the same name: in this case, renaming is both useless debug-wise | |
4268 | and potentially harmful as name resolution in the debugger could | |
4269 | return twice the same entity! So avoid this case. */ | |
4270 | if (debug_info_p && !artificial_p | |
4271 | && !(get_debug_scope (gnat_entity, NULL) | |
4272 | == get_debug_scope (gnat_renamed, NULL) | |
4273 | && Name_Equals (Chars (gnat_entity), | |
4274 | Chars (gnat_renamed))) | |
4275 | && Present (gnat_renamed) | |
4276 | && (Ekind (gnat_renamed) == E_Function | |
4277 | || Ekind (gnat_renamed) == E_Procedure) | |
7c775aca | 4278 | && gnu_decl |
1d4b96e0 AC |
4279 | && TREE_CODE (gnu_decl) == FUNCTION_DECL) |
4280 | { | |
4281 | tree decl = build_decl (input_location, IMPORTED_DECL, | |
4282 | gnu_entity_name, void_type_node); | |
4283 | IMPORTED_DECL_ASSOCIATED_DECL (decl) = gnu_decl; | |
4284 | gnat_pushdecl (decl, gnat_entity); | |
4285 | } | |
4286 | ||
a1ab4c31 AC |
4287 | break; |
4288 | } | |
4289 | ||
4290 | /* If this subprogram is expectedly bound to a GCC builtin, fetch the | |
bb511fbd OH |
4291 | corresponding DECL node. Proper generation of calls later on need |
4292 | proper parameter associations so we don't "break;" here. */ | |
1515785d OH |
4293 | if (Convention (gnat_entity) == Convention_Intrinsic |
4294 | && Present (Interface_Name (gnat_entity))) | |
4295 | { | |
4296 | gnu_builtin_decl = builtin_decl_for (gnu_ext_name); | |
4297 | ||
308e6f3a | 4298 | /* Inability to find the builtin decl most often indicates a |
bb511fbd OH |
4299 | genuine mistake, but imports of unregistered intrinsics are |
4300 | sometimes issued on purpose to allow hooking in alternate | |
4301 | bodies. We post a warning conditioned on Wshadow in this case, | |
4302 | to let developers be notified on demand without risking false | |
4303 | positives with common default sets of options. */ | |
4304 | ||
7c775aca | 4305 | if (!gnu_builtin_decl && warn_shadow) |
1515785d OH |
4306 | post_error ("?gcc intrinsic not found for&!", gnat_entity); |
4307 | } | |
a1ab4c31 AC |
4308 | |
4309 | /* ??? What if we don't find the builtin node above ? warn ? err ? | |
4310 | In the current state we neither warn nor err, and calls will just | |
2ddc34ba | 4311 | be handled as for regular subprograms. */ |
a1ab4c31 | 4312 | |
c9d84d0e EB |
4313 | /* Look into the return type and get its associated GCC tree. If it |
4314 | is not void, compute various flags for the subprogram type. */ | |
4315 | if (Ekind (gnat_return_type) == E_Void) | |
4316 | gnu_return_type = void_type_node; | |
4317 | else | |
a1ab4c31 | 4318 | { |
25eb3455 EB |
4319 | /* Ada 2012 (AI05-0151): Incomplete types coming from a limited |
4320 | context may now appear in parameter and result profiles. If | |
4321 | we are only annotating types, break circularities here. */ | |
4322 | if (type_annotate_only | |
cb55aefb | 4323 | && is_from_limited_with_of_main (gnat_return_type)) |
1366ba41 | 4324 | gnu_return_type = void_type_node; |
25eb3455 EB |
4325 | else |
4326 | gnu_return_type = gnat_to_gnu_type (gnat_return_type); | |
a1ab4c31 | 4327 | |
c9d84d0e EB |
4328 | /* If this function returns by reference, make the actual return |
4329 | type the pointer type and make a note of that. */ | |
4330 | if (Returns_By_Ref (gnat_entity)) | |
4331 | { | |
66dc4b95 | 4332 | gnu_return_type = build_reference_type (gnu_return_type); |
c9d84d0e EB |
4333 | return_by_direct_ref_p = true; |
4334 | } | |
a1ab4c31 | 4335 | |
113c69ff EB |
4336 | /* If the return type is an unconstrained array type, the return |
4337 | value will be allocated on the secondary stack so the actual | |
4338 | return type is the fat pointer type. */ | |
c9d84d0e EB |
4339 | else if (TREE_CODE (gnu_return_type) == UNCONSTRAINED_ARRAY_TYPE) |
4340 | { | |
4341 | gnu_return_type = TREE_TYPE (gnu_return_type); | |
4342 | return_unconstrained_p = true; | |
4343 | } | |
a1ab4c31 | 4344 | |
c9d84d0e | 4345 | /* Likewise, if the return type requires a transient scope, the |
113c69ff EB |
4346 | return value will also be allocated on the secondary stack so |
4347 | the actual return type is the pointer type. */ | |
c9d84d0e EB |
4348 | else if (Requires_Transient_Scope (gnat_return_type)) |
4349 | { | |
66dc4b95 | 4350 | gnu_return_type = build_reference_type (gnu_return_type); |
c9d84d0e EB |
4351 | return_unconstrained_p = true; |
4352 | } | |
a1ab4c31 | 4353 | |
c9d84d0e EB |
4354 | /* If the Mechanism is By_Reference, ensure this function uses the |
4355 | target's by-invisible-reference mechanism, which may not be the | |
4356 | same as above (e.g. it might be passing an extra parameter). */ | |
4357 | else if (kind == E_Function | |
4358 | && Mechanism (gnat_entity) == By_Reference) | |
4359 | return_by_invisi_ref_p = true; | |
4360 | ||
4361 | /* Likewise, if the return type is itself By_Reference. */ | |
a0b8b1b7 | 4362 | else if (TYPE_IS_BY_REFERENCE_P (gnu_return_type)) |
c9d84d0e EB |
4363 | return_by_invisi_ref_p = true; |
4364 | ||
4365 | /* If the type is a padded type and the underlying type would not | |
4366 | be passed by reference or the function has a foreign convention, | |
4367 | return the underlying type. */ | |
4368 | else if (TYPE_IS_PADDING_P (gnu_return_type) | |
4369 | && (!default_pass_by_ref | |
4370 | (TREE_TYPE (TYPE_FIELDS (gnu_return_type))) | |
4371 | || Has_Foreign_Convention (gnat_entity))) | |
4372 | gnu_return_type = TREE_TYPE (TYPE_FIELDS (gnu_return_type)); | |
4373 | ||
4374 | /* If the return type is unconstrained, that means it must have a | |
4375 | maximum size. Use the padded type as the effective return type. | |
4376 | And ensure the function uses the target's by-invisible-reference | |
4377 | mechanism to avoid copying too much data when it returns. */ | |
4378 | if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_return_type))) | |
4379 | { | |
842d4ee2 | 4380 | tree orig_type = gnu_return_type; |
b24f7345 EB |
4381 | tree max_return_size |
4382 | = max_size (TYPE_SIZE (gnu_return_type), true); | |
4383 | ||
4384 | /* If the size overflows to 0, set it to an arbitrary positive | |
4385 | value so that assignments in the type are preserved. Their | |
4386 | actual size is independent of this positive value. */ | |
4387 | if (TREE_CODE (max_return_size) == INTEGER_CST | |
4388 | && TREE_OVERFLOW (max_return_size) | |
4389 | && integer_zerop (max_return_size)) | |
4390 | { | |
4391 | max_return_size = copy_node (bitsize_unit_node); | |
4392 | TREE_OVERFLOW (max_return_size) = 1; | |
4393 | } | |
842d4ee2 | 4394 | |
c9d84d0e | 4395 | gnu_return_type |
b24f7345 EB |
4396 | = maybe_pad_type (gnu_return_type, max_return_size, 0, |
4397 | gnat_entity, false, false, definition, | |
3e7e725b | 4398 | true); |
51c5169c EB |
4399 | |
4400 | /* Declare it now since it will never be declared otherwise. | |
4401 | This is necessary to ensure that its subtrees are properly | |
4402 | marked. */ | |
842d4ee2 EB |
4403 | if (gnu_return_type != orig_type |
4404 | && !DECL_P (TYPE_NAME (gnu_return_type))) | |
4405 | create_type_decl (TYPE_NAME (gnu_return_type), | |
74746d49 EB |
4406 | gnu_return_type, true, debug_info_p, |
4407 | gnat_entity); | |
51c5169c | 4408 | |
c9d84d0e EB |
4409 | return_by_invisi_ref_p = true; |
4410 | } | |
a1ab4c31 | 4411 | |
c9d84d0e EB |
4412 | /* If the return type has a size that overflows, we cannot have |
4413 | a function that returns that type. This usage doesn't make | |
4414 | sense anyway, so give an error here. */ | |
afd6f702 EB |
4415 | if (!return_by_invisi_ref_p |
4416 | && TYPE_SIZE_UNIT (gnu_return_type) | |
ce3da0d0 EB |
4417 | && TREE_CODE (TYPE_SIZE_UNIT (gnu_return_type)) == INTEGER_CST |
4418 | && !valid_constant_size_p (TYPE_SIZE_UNIT (gnu_return_type))) | |
c9d84d0e EB |
4419 | { |
4420 | post_error ("cannot return type whose size overflows", | |
4421 | gnat_entity); | |
4422 | gnu_return_type = copy_node (gnu_return_type); | |
4423 | TYPE_SIZE (gnu_return_type) = bitsize_zero_node; | |
4424 | TYPE_SIZE_UNIT (gnu_return_type) = size_zero_node; | |
4425 | TYPE_MAIN_VARIANT (gnu_return_type) = gnu_return_type; | |
4426 | TYPE_NEXT_VARIANT (gnu_return_type) = NULL_TREE; | |
4427 | } | |
4428 | } | |
a1ab4c31 | 4429 | |
c9d84d0e EB |
4430 | /* Loop over the parameters and get their associated GCC tree. While |
4431 | doing this, build a copy-in copy-out structure if we need one. */ | |
a1ab4c31 AC |
4432 | for (gnat_param = First_Formal_With_Extras (gnat_entity), parmnum = 0; |
4433 | Present (gnat_param); | |
4434 | gnat_param = Next_Formal_With_Extras (gnat_param), parmnum++) | |
4435 | { | |
25eb3455 | 4436 | Entity_Id gnat_param_type = Etype (gnat_param); |
a1ab4c31 | 4437 | tree gnu_param_name = get_entity_name (gnat_param); |
25eb3455 | 4438 | tree gnu_param_type, gnu_param, gnu_field; |
a1ab4c31 | 4439 | Mechanism_Type mech = Mechanism (gnat_param); |
25eb3455 EB |
4440 | bool copy_in_copy_out = false, fake_param_type; |
4441 | ||
4442 | /* Ada 2012 (AI05-0151): Incomplete types coming from a limited | |
4443 | context may now appear in parameter and result profiles. If | |
4444 | we are only annotating types, break circularities here. */ | |
4445 | if (type_annotate_only | |
cb55aefb | 4446 | && is_from_limited_with_of_main (gnat_param_type)) |
25eb3455 | 4447 | { |
1366ba41 | 4448 | gnu_param_type = void_type_node; |
25eb3455 EB |
4449 | fake_param_type = true; |
4450 | } | |
4451 | else | |
4452 | { | |
4453 | gnu_param_type = gnat_to_gnu_type (gnat_param_type); | |
4454 | fake_param_type = false; | |
4455 | } | |
a1ab4c31 AC |
4456 | |
4457 | /* Builtins are expanded inline and there is no real call sequence | |
4458 | involved. So the type expected by the underlying expander is | |
4459 | always the type of each argument "as is". */ | |
4460 | if (gnu_builtin_decl) | |
4461 | mech = By_Copy; | |
4462 | /* Handle the first parameter of a valued procedure specially. */ | |
4463 | else if (Is_Valued_Procedure (gnat_entity) && parmnum == 0) | |
4464 | mech = By_Copy_Return; | |
4465 | /* Otherwise, see if a Mechanism was supplied that forced this | |
4466 | parameter to be passed one way or another. */ | |
4467 | else if (mech == Default | |
1eb58520 AC |
4468 | || mech == By_Copy |
4469 | || mech == By_Reference) | |
a1ab4c31 | 4470 | ; |
a1ab4c31 AC |
4471 | else if (mech > 0) |
4472 | { | |
4473 | if (TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE | |
4474 | || TREE_CODE (TYPE_SIZE (gnu_param_type)) != INTEGER_CST | |
4475 | || 0 < compare_tree_int (TYPE_SIZE (gnu_param_type), | |
4476 | mech)) | |
4477 | mech = By_Reference; | |
4478 | else | |
4479 | mech = By_Copy; | |
4480 | } | |
4481 | else | |
4482 | { | |
4483 | post_error ("unsupported mechanism for&", gnat_param); | |
4484 | mech = Default; | |
4485 | } | |
4486 | ||
25eb3455 EB |
4487 | /* Do not call gnat_to_gnu_param for a fake parameter type since |
4488 | it will try to use the real type again. */ | |
4489 | if (fake_param_type) | |
4490 | { | |
4491 | if (Ekind (gnat_param) == E_Out_Parameter) | |
4492 | gnu_param = NULL_TREE; | |
4493 | else | |
4494 | { | |
4495 | gnu_param | |
4496 | = create_param_decl (gnu_param_name, gnu_param_type, | |
4497 | false); | |
4498 | Set_Mechanism (gnat_param, | |
4499 | mech == Default ? By_Copy : mech); | |
4500 | if (Ekind (gnat_param) == E_In_Out_Parameter) | |
4501 | copy_in_copy_out = true; | |
4502 | } | |
4503 | } | |
4504 | else | |
4505 | gnu_param | |
4506 | = gnat_to_gnu_param (gnat_param, mech, gnat_entity, | |
4507 | Has_Foreign_Convention (gnat_entity), | |
4508 | ©_in_copy_out); | |
a1ab4c31 AC |
4509 | |
4510 | /* We are returned either a PARM_DECL or a type if no parameter | |
4511 | needs to be passed; in either case, adjust the type. */ | |
4512 | if (DECL_P (gnu_param)) | |
4513 | gnu_param_type = TREE_TYPE (gnu_param); | |
4514 | else | |
4515 | { | |
4516 | gnu_param_type = gnu_param; | |
4517 | gnu_param = NULL_TREE; | |
4518 | } | |
4519 | ||
4304395d EB |
4520 | /* The failure of this assertion will very likely come from an |
4521 | order of elaboration issue for the type of the parameter. */ | |
4522 | gcc_assert (kind == E_Subprogram_Type | |
25ec1790 EB |
4523 | || !TYPE_IS_DUMMY_P (gnu_param_type) |
4524 | || type_annotate_only); | |
4304395d | 4525 | |
a1ab4c31 AC |
4526 | if (gnu_param) |
4527 | { | |
a1ab4c31 AC |
4528 | gnu_param_list = chainon (gnu_param, gnu_param_list); |
4529 | Sloc_to_locus (Sloc (gnat_param), | |
4530 | &DECL_SOURCE_LOCATION (gnu_param)); | |
4531 | save_gnu_tree (gnat_param, gnu_param, false); | |
4532 | ||
4533 | /* If a parameter is a pointer, this function may modify | |
4534 | memory through it and thus shouldn't be considered | |
255e5b04 | 4535 | a const function. Also, the memory may be modified |
a1ab4c31 AC |
4536 | between two calls, so they can't be CSE'ed. The latter |
4537 | case also handles by-ref parameters. */ | |
4538 | if (POINTER_TYPE_P (gnu_param_type) | |
315cff15 | 4539 | || TYPE_IS_FAT_POINTER_P (gnu_param_type)) |
255e5b04 | 4540 | const_flag = false; |
a1ab4c31 AC |
4541 | } |
4542 | ||
4543 | if (copy_in_copy_out) | |
4544 | { | |
35a382b8 | 4545 | if (!gnu_cico_list) |
a1ab4c31 | 4546 | { |
35a382b8 EB |
4547 | tree gnu_new_ret_type = make_node (RECORD_TYPE); |
4548 | ||
4549 | /* If this is a function, we also need a field for the | |
4550 | return value to be placed. */ | |
4551 | if (TREE_CODE (gnu_return_type) != VOID_TYPE) | |
4552 | { | |
4553 | gnu_field | |
4554 | = create_field_decl (get_identifier ("RETVAL"), | |
4555 | gnu_return_type, | |
4556 | gnu_new_ret_type, NULL_TREE, | |
4557 | NULL_TREE, 0, 0); | |
4558 | Sloc_to_locus (Sloc (gnat_entity), | |
4559 | &DECL_SOURCE_LOCATION (gnu_field)); | |
4560 | gnu_field_list = gnu_field; | |
4561 | gnu_cico_list | |
4562 | = tree_cons (gnu_field, void_type_node, NULL_TREE); | |
4563 | } | |
4564 | ||
4565 | gnu_return_type = gnu_new_ret_type; | |
a1ab4c31 | 4566 | TYPE_NAME (gnu_return_type) = get_identifier ("RETURN"); |
46c91e45 EB |
4567 | /* Set a default alignment to speed up accesses. But we |
4568 | shouldn't increase the size of the structure too much, | |
4569 | lest it doesn't fit in return registers anymore. */ | |
fe37c7af MM |
4570 | SET_TYPE_ALIGN (gnu_return_type, |
4571 | get_mode_alignment (ptr_mode)); | |
a1ab4c31 AC |
4572 | } |
4573 | ||
da01bfee EB |
4574 | gnu_field |
4575 | = create_field_decl (gnu_param_name, gnu_param_type, | |
4576 | gnu_return_type, NULL_TREE, NULL_TREE, | |
4577 | 0, 0); | |
a1ab4c31 AC |
4578 | Sloc_to_locus (Sloc (gnat_param), |
4579 | &DECL_SOURCE_LOCATION (gnu_field)); | |
910ad8de | 4580 | DECL_CHAIN (gnu_field) = gnu_field_list; |
a1ab4c31 | 4581 | gnu_field_list = gnu_field; |
d47d0a8d EB |
4582 | gnu_cico_list |
4583 | = tree_cons (gnu_field, gnu_param, gnu_cico_list); | |
a1ab4c31 AC |
4584 | } |
4585 | } | |
4586 | ||
7d5997c6 EB |
4587 | if (gnu_cico_list) |
4588 | { | |
4589 | /* If we have a CICO list but it has only one entry, we convert | |
4590 | this function into a function that returns this object. */ | |
4591 | if (list_length (gnu_cico_list) == 1) | |
4592 | gnu_return_type = TREE_TYPE (TREE_PURPOSE (gnu_cico_list)); | |
4593 | ||
4594 | /* Do not finalize the return type if the subprogram is stubbed | |
4595 | since structures are incomplete for the back-end. */ | |
4596 | else if (Convention (gnat_entity) != Convention_Stubbed) | |
4597 | { | |
4598 | finish_record_type (gnu_return_type, nreverse (gnu_field_list), | |
4599 | 0, false); | |
4600 | ||
4601 | /* Try to promote the mode of the return type if it is passed | |
4602 | in registers, again to speed up accesses. */ | |
4603 | if (TYPE_MODE (gnu_return_type) == BLKmode | |
4604 | && !targetm.calls.return_in_memory (gnu_return_type, | |
4605 | NULL_TREE)) | |
4606 | { | |
4607 | unsigned int size | |
4608 | = TREE_INT_CST_LOW (TYPE_SIZE (gnu_return_type)); | |
4609 | unsigned int i = BITS_PER_UNIT; | |
ef4bddc2 | 4610 | machine_mode mode; |
7d5997c6 EB |
4611 | |
4612 | while (i < size) | |
4613 | i <<= 1; | |
4614 | mode = mode_for_size (i, MODE_INT, 0); | |
4615 | if (mode != BLKmode) | |
4616 | { | |
4617 | SET_TYPE_MODE (gnu_return_type, mode); | |
fe37c7af MM |
4618 | SET_TYPE_ALIGN (gnu_return_type, |
4619 | GET_MODE_ALIGNMENT (mode)); | |
7d5997c6 EB |
4620 | TYPE_SIZE (gnu_return_type) |
4621 | = bitsize_int (GET_MODE_BITSIZE (mode)); | |
4622 | TYPE_SIZE_UNIT (gnu_return_type) | |
4623 | = size_int (GET_MODE_SIZE (mode)); | |
4624 | } | |
4625 | } | |
4626 | ||
4627 | if (debug_info_p) | |
4628 | rest_of_record_type_compilation (gnu_return_type); | |
4629 | } | |
4630 | } | |
a1ab4c31 | 4631 | |
0567ae8d | 4632 | /* Deal with platform-specific calling conventions. */ |
a1ab4c31 | 4633 | if (Has_Stdcall_Convention (gnat_entity)) |
0567ae8d | 4634 | prepend_one_attribute |
a1ab4c31 AC |
4635 | (&attr_list, ATTR_MACHINE_ATTRIBUTE, |
4636 | get_identifier ("stdcall"), NULL_TREE, | |
4637 | gnat_entity); | |
28dd0055 | 4638 | else if (Has_Thiscall_Convention (gnat_entity)) |
0567ae8d | 4639 | prepend_one_attribute |
28dd0055 EB |
4640 | (&attr_list, ATTR_MACHINE_ATTRIBUTE, |
4641 | get_identifier ("thiscall"), NULL_TREE, | |
4642 | gnat_entity); | |
a1ab4c31 | 4643 | |
66194a98 | 4644 | /* If we should request stack realignment for a foreign convention |
0567ae8d AC |
4645 | subprogram, do so. Note that this applies to task entry points |
4646 | in particular. */ | |
66194a98 | 4647 | if (FOREIGN_FORCE_REALIGN_STACK |
a1ab4c31 | 4648 | && Has_Foreign_Convention (gnat_entity)) |
0567ae8d | 4649 | prepend_one_attribute |
a1ab4c31 AC |
4650 | (&attr_list, ATTR_MACHINE_ATTRIBUTE, |
4651 | get_identifier ("force_align_arg_pointer"), NULL_TREE, | |
4652 | gnat_entity); | |
4653 | ||
0567ae8d AC |
4654 | /* Deal with a pragma Linker_Section on a subprogram. */ |
4655 | if ((kind == E_Function || kind == E_Procedure) | |
4656 | && Present (Linker_Section_Pragma (gnat_entity))) | |
4657 | prepend_one_attribute_pragma (&attr_list, | |
4658 | Linker_Section_Pragma (gnat_entity)); | |
4659 | ||
a1ab4c31 AC |
4660 | /* The lists have been built in reverse. */ |
4661 | gnu_param_list = nreverse (gnu_param_list); | |
d47d0a8d | 4662 | gnu_cico_list = nreverse (gnu_cico_list); |
a1ab4c31 | 4663 | |
4304395d | 4664 | if (kind == E_Function) |
d47d0a8d EB |
4665 | Set_Mechanism (gnat_entity, return_unconstrained_p |
4666 | || return_by_direct_ref_p | |
4667 | || return_by_invisi_ref_p | |
4668 | ? By_Reference : By_Copy); | |
a1ab4c31 AC |
4669 | gnu_type |
4670 | = create_subprog_type (gnu_return_type, gnu_param_list, | |
d47d0a8d EB |
4671 | gnu_cico_list, return_unconstrained_p, |
4672 | return_by_direct_ref_p, | |
4673 | return_by_invisi_ref_p); | |
a1ab4c31 | 4674 | |
113c69ff EB |
4675 | /* A procedure (something that doesn't return anything) shouldn't be |
4676 | considered const since there would be no reason for calling such a | |
a1ab4c31 | 4677 | subprogram. Note that procedures with Out (or In Out) parameters |
113c69ff EB |
4678 | have already been converted into a function with a return type. |
4679 | Similarly, if the function returns an unconstrained type, then the | |
4680 | function will allocate the return value on the secondary stack and | |
4681 | thus calls to it cannot be CSE'ed, lest the stack be reclaimed. */ | |
4682 | if (TREE_CODE (gnu_return_type) == VOID_TYPE || return_unconstrained_p) | |
255e5b04 | 4683 | const_flag = false; |
2eee5152 | 4684 | |
1515785d OH |
4685 | /* If we have a builtin decl for that function, use it. Check if the |
4686 | profiles are compatible and warn if they are not. The checker is | |
4687 | expected to post extra diagnostics in this case. */ | |
a1ab4c31 AC |
4688 | if (gnu_builtin_decl) |
4689 | { | |
1515785d | 4690 | intrin_binding_t inb; |
a1ab4c31 | 4691 | |
1515785d OH |
4692 | inb.gnat_entity = gnat_entity; |
4693 | inb.ada_fntype = gnu_type; | |
4694 | inb.btin_fntype = TREE_TYPE (gnu_builtin_decl); | |
4695 | ||
4696 | if (!intrin_profiles_compatible_p (&inb)) | |
4697 | post_error | |
bb511fbd | 4698 | ("?profile of& doesn''t match the builtin it binds!", |
1515785d OH |
4699 | gnat_entity); |
4700 | ||
4701 | gnu_decl = gnu_builtin_decl; | |
4702 | gnu_type = TREE_TYPE (gnu_builtin_decl); | |
4703 | break; | |
a1ab4c31 AC |
4704 | } |
4705 | ||
4706 | /* If there was no specified Interface_Name and the external and | |
4707 | internal names of the subprogram are the same, only use the | |
4708 | internal name to allow disambiguation of nested subprograms. */ | |
0fb2335d EB |
4709 | if (No (Interface_Name (gnat_entity)) |
4710 | && gnu_ext_name == gnu_entity_name) | |
a1ab4c31 AC |
4711 | gnu_ext_name = NULL_TREE; |
4712 | ||
4713 | /* If we are defining the subprogram and it has an Address clause | |
4714 | we must get the address expression from the saved GCC tree for the | |
4715 | subprogram if it has a Freeze_Node. Otherwise, we elaborate | |
4716 | the address expression here since the front-end has guaranteed | |
4717 | in that case that the elaboration has no effects. If there is | |
4718 | an Address clause and we are not defining the object, just | |
4719 | make it a constant. */ | |
4720 | if (Present (Address_Clause (gnat_entity))) | |
4721 | { | |
4722 | tree gnu_address = NULL_TREE; | |
4723 | ||
4724 | if (definition) | |
4725 | gnu_address | |
4726 | = (present_gnu_tree (gnat_entity) | |
4727 | ? get_gnu_tree (gnat_entity) | |
4728 | : gnat_to_gnu (Expression (Address_Clause (gnat_entity)))); | |
4729 | ||
4730 | save_gnu_tree (gnat_entity, NULL_TREE, false); | |
4731 | ||
4732 | /* Convert the type of the object to a reference type that can | |
b3b5c6a2 | 4733 | alias everything as per RM 13.3(19). */ |
a1ab4c31 AC |
4734 | gnu_type |
4735 | = build_reference_type_for_mode (gnu_type, ptr_mode, true); | |
4736 | if (gnu_address) | |
4737 | gnu_address = convert (gnu_type, gnu_address); | |
4738 | ||
4739 | gnu_decl | |
0fb2335d | 4740 | = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type, |
a1ab4c31 | 4741 | gnu_address, false, Is_Public (gnat_entity), |
2056c5ed | 4742 | extern_flag, false, false, artificial_p, |
c1a569ef | 4743 | debug_info_p, NULL, gnat_entity); |
a1ab4c31 AC |
4744 | DECL_BY_REF_P (gnu_decl) = 1; |
4745 | } | |
4746 | ||
4747 | else if (kind == E_Subprogram_Type) | |
74746d49 EB |
4748 | { |
4749 | process_attributes (&gnu_type, &attr_list, false, gnat_entity); | |
2056c5ed EB |
4750 | |
4751 | if (const_flag || volatile_flag) | |
4752 | { | |
4753 | const int quals | |
4754 | = (const_flag ? TYPE_QUAL_CONST : 0) | |
4755 | | (volatile_flag ? TYPE_QUAL_VOLATILE : 0); | |
4756 | gnu_type = change_qualified_type (gnu_type, quals); | |
4757 | } | |
4758 | ||
74746d49 | 4759 | gnu_decl |
c1a569ef | 4760 | = create_type_decl (gnu_entity_name, gnu_type, artificial_p, |
74746d49 EB |
4761 | debug_info_p, gnat_entity); |
4762 | } | |
a1ab4c31 AC |
4763 | else |
4764 | { | |
7d7fcb08 EB |
4765 | gnu_decl |
4766 | = create_subprog_decl (gnu_entity_name, gnu_ext_name, gnu_type, | |
2056c5ed EB |
4767 | gnu_param_list, inline_status, const_flag, |
4768 | public_flag, extern_flag, volatile_flag, | |
4769 | artificial_p, debug_info_p, | |
4770 | attr_list, gnat_entity); | |
a1ab4c31 AC |
4771 | /* This is unrelated to the stub built right above. */ |
4772 | DECL_STUBBED_P (gnu_decl) | |
4773 | = Convention (gnat_entity) == Convention_Stubbed; | |
4774 | } | |
4775 | } | |
4776 | break; | |
4777 | ||
4778 | case E_Incomplete_Type: | |
4779 | case E_Incomplete_Subtype: | |
4780 | case E_Private_Type: | |
4781 | case E_Private_Subtype: | |
4782 | case E_Limited_Private_Type: | |
4783 | case E_Limited_Private_Subtype: | |
4784 | case E_Record_Type_With_Private: | |
4785 | case E_Record_Subtype_With_Private: | |
4786 | { | |
bd769c83 EB |
4787 | bool is_from_limited_with |
4788 | = (IN (kind, Incomplete_Kind) && From_Limited_With (gnat_entity)); | |
a1ab4c31 AC |
4789 | /* Get the "full view" of this entity. If this is an incomplete |
4790 | entity from a limited with, treat its non-limited view as the | |
4791 | full view. Otherwise, use either the full view or the underlying | |
4792 | full view, whichever is present. This is used in all the tests | |
4793 | below. */ | |
4794 | Entity_Id full_view | |
bd769c83 | 4795 | = is_from_limited_with |
a1ab4c31 AC |
4796 | ? Non_Limited_View (gnat_entity) |
4797 | : Present (Full_View (gnat_entity)) | |
4798 | ? Full_View (gnat_entity) | |
bf0b0e5e AC |
4799 | : IN (kind, Private_Kind) |
4800 | ? Underlying_Full_View (gnat_entity) | |
4801 | : Empty; | |
a1ab4c31 AC |
4802 | |
4803 | /* If this is an incomplete type with no full view, it must be a Taft | |
4804 | Amendment type, in which case we return a dummy type. Otherwise, | |
4805 | just get the type from its Etype. */ | |
4806 | if (No (full_view)) | |
4807 | { | |
4808 | if (kind == E_Incomplete_Type) | |
10069d53 EB |
4809 | { |
4810 | gnu_type = make_dummy_type (gnat_entity); | |
4811 | gnu_decl = TYPE_STUB_DECL (gnu_type); | |
4812 | } | |
a1ab4c31 AC |
4813 | else |
4814 | { | |
4815 | gnu_decl = gnat_to_gnu_entity (Etype (gnat_entity), | |
4816 | NULL_TREE, 0); | |
4817 | maybe_present = true; | |
4818 | } | |
4819 | break; | |
4820 | } | |
4821 | ||
4822 | /* If we already made a type for the full view, reuse it. */ | |
4823 | else if (present_gnu_tree (full_view)) | |
4824 | { | |
4825 | gnu_decl = get_gnu_tree (full_view); | |
4826 | break; | |
4827 | } | |
4828 | ||
4829 | /* Otherwise, if we are not defining the type now, get the type | |
4830 | from the full view. But always get the type from the full view | |
bd769c83 EB |
4831 | for define on use types, since otherwise we won't see them. |
4832 | Likewise if this is a non-limited view not declared in the main | |
4833 | unit, which can happen for incomplete formal types instantiated | |
4834 | on a type coming from a limited_with clause. */ | |
a1ab4c31 | 4835 | else if (!definition |
fd6e497e | 4836 | || (Is_Itype (full_view) && No (Freeze_Node (gnat_entity))) |
bd769c83 EB |
4837 | || (Is_Itype (gnat_entity) && No (Freeze_Node (full_view))) |
4838 | || (is_from_limited_with | |
4839 | && !In_Extended_Main_Code_Unit (full_view))) | |
a1ab4c31 AC |
4840 | { |
4841 | gnu_decl = gnat_to_gnu_entity (full_view, NULL_TREE, 0); | |
4842 | maybe_present = true; | |
4843 | break; | |
4844 | } | |
4845 | ||
4846 | /* For incomplete types, make a dummy type entry which will be | |
10069d53 EB |
4847 | replaced later. Save it as the full declaration's type so |
4848 | we can do any needed updates when we see it. */ | |
a1ab4c31 | 4849 | gnu_type = make_dummy_type (gnat_entity); |
10069d53 | 4850 | gnu_decl = TYPE_STUB_DECL (gnu_type); |
65444786 EB |
4851 | if (Has_Completion_In_Body (gnat_entity)) |
4852 | DECL_TAFT_TYPE_P (gnu_decl) = 1; | |
a1ab4c31 AC |
4853 | save_gnu_tree (full_view, gnu_decl, 0); |
4854 | break; | |
4855 | } | |
4856 | ||
a1ab4c31 | 4857 | case E_Class_Wide_Type: |
f08863f9 | 4858 | /* Class-wide types are always transformed into their root type. */ |
a1ab4c31 AC |
4859 | gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0); |
4860 | maybe_present = true; | |
4861 | break; | |
4862 | ||
a1ab4c31 AC |
4863 | case E_Protected_Type: |
4864 | case E_Protected_Subtype: | |
c4833de1 EB |
4865 | case E_Task_Type: |
4866 | case E_Task_Subtype: | |
4867 | /* If we are just annotating types and have no equivalent record type, | |
4868 | just return void_type, except for root types that have discriminants | |
4869 | because the discriminants will very likely be used in the declarative | |
4870 | part of the associated body so they need to be translated. */ | |
a1ab4c31 | 4871 | if (type_annotate_only && No (gnat_equiv_type)) |
c4833de1 EB |
4872 | { |
4873 | if (Has_Discriminants (gnat_entity) | |
4874 | && Root_Type (gnat_entity) == gnat_entity) | |
4875 | { | |
4876 | tree gnu_field_list = NULL_TREE; | |
4877 | Entity_Id gnat_field; | |
4878 | ||
4879 | /* This is a minimal version of the E_Record_Type handling. */ | |
4880 | gnu_type = make_node (RECORD_TYPE); | |
4881 | TYPE_NAME (gnu_type) = gnu_entity_name; | |
4882 | ||
4883 | for (gnat_field = First_Stored_Discriminant (gnat_entity); | |
4884 | Present (gnat_field); | |
4885 | gnat_field = Next_Stored_Discriminant (gnat_field)) | |
4886 | { | |
4887 | tree gnu_field | |
4888 | = gnat_to_gnu_field (gnat_field, gnu_type, false, | |
4889 | definition, debug_info_p); | |
4890 | ||
4891 | save_gnu_tree (gnat_field, | |
4892 | build3 (COMPONENT_REF, TREE_TYPE (gnu_field), | |
4893 | build0 (PLACEHOLDER_EXPR, gnu_type), | |
4894 | gnu_field, NULL_TREE), | |
4895 | true); | |
4896 | ||
4897 | DECL_CHAIN (gnu_field) = gnu_field_list; | |
4898 | gnu_field_list = gnu_field; | |
4899 | } | |
4900 | ||
68ec5613 EB |
4901 | finish_record_type (gnu_type, nreverse (gnu_field_list), 0, |
4902 | false); | |
c4833de1 EB |
4903 | } |
4904 | else | |
4905 | gnu_type = void_type_node; | |
4906 | } | |
4907 | ||
4908 | /* Concurrent types are always transformed into their record type. */ | |
a1ab4c31 | 4909 | else |
e6bdd039 | 4910 | gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0); |
a1ab4c31 AC |
4911 | maybe_present = true; |
4912 | break; | |
4913 | ||
4914 | case E_Label: | |
88a94e2b | 4915 | gnu_decl = create_label_decl (gnu_entity_name, gnat_entity); |
a1ab4c31 AC |
4916 | break; |
4917 | ||
4918 | case E_Block: | |
4919 | case E_Loop: | |
4920 | /* Nothing at all to do here, so just return an ERROR_MARK and claim | |
4921 | we've already saved it, so we don't try to. */ | |
4922 | gnu_decl = error_mark_node; | |
4923 | saved = true; | |
4924 | break; | |
4925 | ||
d2c03c72 EB |
4926 | case E_Abstract_State: |
4927 | /* This is a SPARK annotation that only reaches here when compiling in | |
c8dbf886 | 4928 | ASIS mode. */ |
d2c03c72 | 4929 | gcc_assert (type_annotate_only); |
c8dbf886 EB |
4930 | gnu_decl = error_mark_node; |
4931 | saved = true; | |
4932 | break; | |
d2c03c72 | 4933 | |
a1ab4c31 AC |
4934 | default: |
4935 | gcc_unreachable (); | |
4936 | } | |
4937 | ||
4938 | /* If we had a case where we evaluated another type and it might have | |
4939 | defined this one, handle it here. */ | |
4940 | if (maybe_present && present_gnu_tree (gnat_entity)) | |
4941 | { | |
4942 | gnu_decl = get_gnu_tree (gnat_entity); | |
4943 | saved = true; | |
4944 | } | |
4945 | ||
4946 | /* If we are processing a type and there is either no decl for it or | |
4947 | we just made one, do some common processing for the type, such as | |
4948 | handling alignment and possible padding. */ | |
a8e05f92 | 4949 | if (is_type && (!gnu_decl || this_made_decl)) |
a1ab4c31 | 4950 | { |
74746d49 | 4951 | /* Process the attributes, if not already done. Note that the type is |
78df6221 | 4952 | already defined so we cannot pass true for IN_PLACE here. */ |
74746d49 EB |
4953 | process_attributes (&gnu_type, &attr_list, false, gnat_entity); |
4954 | ||
76af763d EB |
4955 | /* Tell the middle-end that objects of tagged types are guaranteed to |
4956 | be properly aligned. This is necessary because conversions to the | |
4957 | class-wide type are translated into conversions to the root type, | |
4958 | which can be less aligned than some of its derived types. */ | |
a1ab4c31 AC |
4959 | if (Is_Tagged_Type (gnat_entity) |
4960 | || Is_Class_Wide_Equivalent_Type (gnat_entity)) | |
4961 | TYPE_ALIGN_OK (gnu_type) = 1; | |
4962 | ||
a0b8b1b7 EB |
4963 | /* Record whether the type is passed by reference. */ |
4964 | if (!VOID_TYPE_P (gnu_type) && Is_By_Reference_Type (gnat_entity)) | |
4965 | TYPE_BY_REFERENCE_P (gnu_type) = 1; | |
a1ab4c31 AC |
4966 | |
4967 | /* ??? Don't set the size for a String_Literal since it is either | |
4968 | confirming or we don't handle it properly (if the low bound is | |
4969 | non-constant). */ | |
4970 | if (!gnu_size && kind != E_String_Literal_Subtype) | |
fc893455 AC |
4971 | { |
4972 | Uint gnat_size = Known_Esize (gnat_entity) | |
4973 | ? Esize (gnat_entity) : RM_Size (gnat_entity); | |
4974 | gnu_size | |
4975 | = validate_size (gnat_size, gnu_type, gnat_entity, TYPE_DECL, | |
4976 | false, Has_Size_Clause (gnat_entity)); | |
4977 | } | |
a1ab4c31 AC |
4978 | |
4979 | /* If a size was specified, see if we can make a new type of that size | |
4980 | by rearranging the type, for example from a fat to a thin pointer. */ | |
4981 | if (gnu_size) | |
4982 | { | |
4983 | gnu_type | |
4984 | = make_type_from_size (gnu_type, gnu_size, | |
4985 | Has_Biased_Representation (gnat_entity)); | |
4986 | ||
4987 | if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0) | |
4988 | && operand_equal_p (rm_size (gnu_type), gnu_size, 0)) | |
842d4ee2 | 4989 | gnu_size = NULL_TREE; |
a1ab4c31 AC |
4990 | } |
4991 | ||
4aecc2f8 EB |
4992 | /* If the alignment has not already been processed and this is not |
4993 | an unconstrained array type, see if an alignment is specified. | |
a1ab4c31 AC |
4994 | If not, we pick a default alignment for atomic objects. */ |
4995 | if (align != 0 || TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE) | |
4996 | ; | |
4997 | else if (Known_Alignment (gnat_entity)) | |
4998 | { | |
4999 | align = validate_alignment (Alignment (gnat_entity), gnat_entity, | |
5000 | TYPE_ALIGN (gnu_type)); | |
5001 | ||
5002 | /* Warn on suspiciously large alignments. This should catch | |
5003 | errors about the (alignment,byte)/(size,bit) discrepancy. */ | |
5004 | if (align > BIGGEST_ALIGNMENT && Has_Alignment_Clause (gnat_entity)) | |
5005 | { | |
5006 | tree size; | |
5007 | ||
5008 | /* If a size was specified, take it into account. Otherwise | |
e1e5852c EB |
5009 | use the RM size for records or unions as the type size has |
5010 | already been adjusted to the alignment. */ | |
a1ab4c31 AC |
5011 | if (gnu_size) |
5012 | size = gnu_size; | |
e1e5852c | 5013 | else if (RECORD_OR_UNION_TYPE_P (gnu_type) |
315cff15 | 5014 | && !TYPE_FAT_POINTER_P (gnu_type)) |
a1ab4c31 AC |
5015 | size = rm_size (gnu_type); |
5016 | else | |
5017 | size = TYPE_SIZE (gnu_type); | |
5018 | ||
5019 | /* Consider an alignment as suspicious if the alignment/size | |
5020 | ratio is greater or equal to the byte/bit ratio. */ | |
cc269bb6 | 5021 | if (tree_fits_uhwi_p (size) |
eb1ce453 | 5022 | && align >= tree_to_uhwi (size) * BITS_PER_UNIT) |
a1ab4c31 AC |
5023 | post_error_ne ("?suspiciously large alignment specified for&", |
5024 | Expression (Alignment_Clause (gnat_entity)), | |
5025 | gnat_entity); | |
5026 | } | |
5027 | } | |
f797c2b7 | 5028 | else if (Is_Atomic_Or_VFA (gnat_entity) && !gnu_size |
cc269bb6 | 5029 | && tree_fits_uhwi_p (TYPE_SIZE (gnu_type)) |
a1ab4c31 AC |
5030 | && integer_pow2p (TYPE_SIZE (gnu_type))) |
5031 | align = MIN (BIGGEST_ALIGNMENT, | |
ae7e9ddd | 5032 | tree_to_uhwi (TYPE_SIZE (gnu_type))); |
f797c2b7 | 5033 | else if (Is_Atomic_Or_VFA (gnat_entity) && gnu_size |
cc269bb6 | 5034 | && tree_fits_uhwi_p (gnu_size) |
a1ab4c31 | 5035 | && integer_pow2p (gnu_size)) |
ae7e9ddd | 5036 | align = MIN (BIGGEST_ALIGNMENT, tree_to_uhwi (gnu_size)); |
a1ab4c31 AC |
5037 | |
5038 | /* See if we need to pad the type. If we did, and made a record, | |
5039 | the name of the new type may be changed. So get it back for | |
5040 | us when we make the new TYPE_DECL below. */ | |
5041 | if (gnu_size || align > 0) | |
5042 | gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity, | |
9a1c0fd9 | 5043 | false, !gnu_decl, definition, false); |
a1ab4c31 | 5044 | |
315cff15 | 5045 | if (TYPE_IS_PADDING_P (gnu_type)) |
9dba4b55 | 5046 | gnu_entity_name = TYPE_IDENTIFIER (gnu_type); |
a1ab4c31 | 5047 | |
842d4ee2 EB |
5048 | /* Now set the RM size of the type. We cannot do it before padding |
5049 | because we need to accept arbitrary RM sizes on integral types. */ | |
a1ab4c31 AC |
5050 | set_rm_size (RM_Size (gnat_entity), gnu_type, gnat_entity); |
5051 | ||
5052 | /* If we are at global level, GCC will have applied variable_size to | |
5053 | the type, but that won't have done anything. So, if it's not | |
5054 | a constant or self-referential, call elaborate_expression_1 to | |
5055 | make a variable for the size rather than calculating it each time. | |
5056 | Handle both the RM size and the actual size. */ | |
5057 | if (global_bindings_p () | |
5058 | && TYPE_SIZE (gnu_type) | |
5059 | && !TREE_CONSTANT (TYPE_SIZE (gnu_type)) | |
5060 | && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))) | |
5061 | { | |
da01bfee EB |
5062 | tree size = TYPE_SIZE (gnu_type); |
5063 | ||
5064 | TYPE_SIZE (gnu_type) | |
bf44701f EB |
5065 | = elaborate_expression_1 (size, gnat_entity, "SIZE", definition, |
5066 | false); | |
da01bfee EB |
5067 | |
5068 | /* ??? For now, store the size as a multiple of the alignment in | |
5069 | bytes so that we can see the alignment from the tree. */ | |
5070 | TYPE_SIZE_UNIT (gnu_type) | |
5071 | = elaborate_expression_2 (TYPE_SIZE_UNIT (gnu_type), gnat_entity, | |
bf44701f | 5072 | "SIZE_A_UNIT", definition, false, |
da01bfee EB |
5073 | TYPE_ALIGN (gnu_type)); |
5074 | ||
5075 | /* ??? gnu_type may come from an existing type so the MULT_EXPR node | |
5076 | may not be marked by the call to create_type_decl below. */ | |
5077 | MARK_VISITED (TYPE_SIZE_UNIT (gnu_type)); | |
5078 | ||
5079 | if (TREE_CODE (gnu_type) == RECORD_TYPE) | |
a1ab4c31 | 5080 | { |
35e2a4b8 | 5081 | tree variant_part = get_variant_part (gnu_type); |
da01bfee | 5082 | tree ada_size = TYPE_ADA_SIZE (gnu_type); |
a1ab4c31 | 5083 | |
35e2a4b8 EB |
5084 | if (variant_part) |
5085 | { | |
5086 | tree union_type = TREE_TYPE (variant_part); | |
5087 | tree offset = DECL_FIELD_OFFSET (variant_part); | |
5088 | ||
5089 | /* If the position of the variant part is constant, subtract | |
5090 | it from the size of the type of the parent to get the new | |
5091 | size. This manual CSE reduces the data size. */ | |
5092 | if (TREE_CODE (offset) == INTEGER_CST) | |
5093 | { | |
5094 | tree bitpos = DECL_FIELD_BIT_OFFSET (variant_part); | |
5095 | TYPE_SIZE (union_type) | |
5096 | = size_binop (MINUS_EXPR, TYPE_SIZE (gnu_type), | |
5097 | bit_from_pos (offset, bitpos)); | |
5098 | TYPE_SIZE_UNIT (union_type) | |
5099 | = size_binop (MINUS_EXPR, TYPE_SIZE_UNIT (gnu_type), | |
5100 | byte_from_pos (offset, bitpos)); | |
5101 | } | |
5102 | else | |
5103 | { | |
5104 | TYPE_SIZE (union_type) | |
5105 | = elaborate_expression_1 (TYPE_SIZE (union_type), | |
bf44701f | 5106 | gnat_entity, "VSIZE", |
35e2a4b8 EB |
5107 | definition, false); |
5108 | ||
5109 | /* ??? For now, store the size as a multiple of the | |
5110 | alignment in bytes so that we can see the alignment | |
5111 | from the tree. */ | |
5112 | TYPE_SIZE_UNIT (union_type) | |
5113 | = elaborate_expression_2 (TYPE_SIZE_UNIT (union_type), | |
bf44701f | 5114 | gnat_entity, "VSIZE_A_UNIT", |
35e2a4b8 EB |
5115 | definition, false, |
5116 | TYPE_ALIGN (union_type)); | |
5117 | ||
5118 | /* ??? For now, store the offset as a multiple of the | |
5119 | alignment in bytes so that we can see the alignment | |
5120 | from the tree. */ | |
5121 | DECL_FIELD_OFFSET (variant_part) | |
bf44701f EB |
5122 | = elaborate_expression_2 (offset, gnat_entity, |
5123 | "VOFFSET", definition, false, | |
35e2a4b8 EB |
5124 | DECL_OFFSET_ALIGN |
5125 | (variant_part)); | |
5126 | } | |
5127 | ||
5128 | DECL_SIZE (variant_part) = TYPE_SIZE (union_type); | |
5129 | DECL_SIZE_UNIT (variant_part) = TYPE_SIZE_UNIT (union_type); | |
5130 | } | |
5131 | ||
da01bfee EB |
5132 | if (operand_equal_p (ada_size, size, 0)) |
5133 | ada_size = TYPE_SIZE (gnu_type); | |
5134 | else | |
5135 | ada_size | |
bf44701f | 5136 | = elaborate_expression_1 (ada_size, gnat_entity, "RM_SIZE", |
da01bfee EB |
5137 | definition, false); |
5138 | SET_TYPE_ADA_SIZE (gnu_type, ada_size); | |
5139 | } | |
a1ab4c31 AC |
5140 | } |
5141 | ||
c19ff724 | 5142 | /* If this is a record type or subtype, call elaborate_expression_2 on |
a1ab4c31 AC |
5143 | any field position. Do this for both global and local types. |
5144 | Skip any fields that we haven't made trees for to avoid problems with | |
5145 | class wide types. */ | |
5146 | if (IN (kind, Record_Kind)) | |
5147 | for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp); | |
5148 | gnat_temp = Next_Entity (gnat_temp)) | |
5149 | if (Ekind (gnat_temp) == E_Component && present_gnu_tree (gnat_temp)) | |
5150 | { | |
5151 | tree gnu_field = get_gnu_tree (gnat_temp); | |
5152 | ||
da01bfee EB |
5153 | /* ??? For now, store the offset as a multiple of the alignment |
5154 | in bytes so that we can see the alignment from the tree. */ | |
a1ab4c31 AC |
5155 | if (!CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (gnu_field))) |
5156 | { | |
da01bfee EB |
5157 | DECL_FIELD_OFFSET (gnu_field) |
5158 | = elaborate_expression_2 (DECL_FIELD_OFFSET (gnu_field), | |
bf44701f EB |
5159 | gnat_temp, "OFFSET", definition, |
5160 | false, | |
da01bfee EB |
5161 | DECL_OFFSET_ALIGN (gnu_field)); |
5162 | ||
5163 | /* ??? The context of gnu_field is not necessarily gnu_type | |
5164 | so the MULT_EXPR node built above may not be marked by | |
5165 | the call to create_type_decl below. */ | |
5166 | if (global_bindings_p ()) | |
5167 | MARK_VISITED (DECL_FIELD_OFFSET (gnu_field)); | |
a1ab4c31 AC |
5168 | } |
5169 | } | |
5170 | ||
f797c2b7 | 5171 | if (Is_Atomic_Or_VFA (gnat_entity)) |
86a8ba5b | 5172 | check_ok_for_atomic_type (gnu_type, gnat_entity, false); |
a1ab4c31 | 5173 | |
4aecc2f8 EB |
5174 | /* If this is not an unconstrained array type, set some flags. */ |
5175 | if (TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE) | |
5176 | { | |
4aecc2f8 EB |
5177 | if (Present (Alignment_Clause (gnat_entity))) |
5178 | TYPE_USER_ALIGN (gnu_type) = 1; | |
5179 | ||
5180 | if (Universal_Aliasing (gnat_entity)) | |
f797c2b7 EB |
5181 | TYPE_UNIVERSAL_ALIASING_P (gnu_type) = 1; |
5182 | ||
5183 | /* If it is passed by reference, force BLKmode to ensure that | |
5184 | objects of this type will always be put in memory. */ | |
5185 | if (TYPE_MODE (gnu_type) != BLKmode | |
5186 | && AGGREGATE_TYPE_P (gnu_type) | |
5187 | && TYPE_BY_REFERENCE_P (gnu_type)) | |
5188 | SET_TYPE_MODE (gnu_type, BLKmode); | |
5189 | ||
5190 | if (Treat_As_Volatile (gnat_entity)) | |
5191 | { | |
5192 | const int quals | |
5193 | = TYPE_QUAL_VOLATILE | |
5194 | | (Is_Atomic_Or_VFA (gnat_entity) ? TYPE_QUAL_ATOMIC : 0); | |
5195 | gnu_type = change_qualified_type (gnu_type, quals); | |
5196 | } | |
4aecc2f8 | 5197 | } |
a1ab4c31 AC |
5198 | |
5199 | if (!gnu_decl) | |
74746d49 | 5200 | gnu_decl = create_type_decl (gnu_entity_name, gnu_type, |
c1a569ef EB |
5201 | artificial_p, debug_info_p, |
5202 | gnat_entity); | |
a1ab4c31 | 5203 | else |
9a1c0fd9 EB |
5204 | { |
5205 | TREE_TYPE (gnu_decl) = gnu_type; | |
5206 | TYPE_STUB_DECL (gnu_type) = gnu_decl; | |
5207 | } | |
a1ab4c31 AC |
5208 | } |
5209 | ||
a8e05f92 | 5210 | if (is_type && !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl))) |
a1ab4c31 AC |
5211 | { |
5212 | gnu_type = TREE_TYPE (gnu_decl); | |
5213 | ||
794511d2 EB |
5214 | /* If this is a derived type, relate its alias set to that of its parent |
5215 | to avoid troubles when a call to an inherited primitive is inlined in | |
5216 | a context where a derived object is accessed. The inlined code works | |
5217 | on the parent view so the resulting code may access the same object | |
5218 | using both the parent and the derived alias sets, which thus have to | |
5219 | conflict. As the same issue arises with component references, the | |
5220 | parent alias set also has to conflict with composite types enclosing | |
5221 | derived components. For instance, if we have: | |
5222 | ||
5223 | type D is new T; | |
5224 | type R is record | |
5225 | Component : D; | |
5226 | end record; | |
5227 | ||
5228 | we want T to conflict with both D and R, in addition to R being a | |
5229 | superset of D by record/component construction. | |
5230 | ||
5231 | One way to achieve this is to perform an alias set copy from the | |
5232 | parent to the derived type. This is not quite appropriate, though, | |
5233 | as we don't want separate derived types to conflict with each other: | |
5234 | ||
5235 | type I1 is new Integer; | |
5236 | type I2 is new Integer; | |
5237 | ||
5238 | We want I1 and I2 to both conflict with Integer but we do not want | |
5239 | I1 to conflict with I2, and an alias set copy on derivation would | |
5240 | have that effect. | |
5241 | ||
5242 | The option chosen is to make the alias set of the derived type a | |
5243 | superset of that of its parent type. It trivially fulfills the | |
5244 | simple requirement for the Integer derivation example above, and | |
5245 | the component case as well by superset transitivity: | |
5246 | ||
5247 | superset superset | |
5248 | R ----------> D ----------> T | |
5249 | ||
d8e94f79 EB |
5250 | However, for composite types, conversions between derived types are |
5251 | translated into VIEW_CONVERT_EXPRs so a sequence like: | |
5252 | ||
5253 | type Comp1 is new Comp; | |
5254 | type Comp2 is new Comp; | |
5255 | procedure Proc (C : Comp1); | |
5256 | ||
5257 | C : Comp2; | |
5258 | Proc (Comp1 (C)); | |
5259 | ||
5260 | is translated into: | |
5261 | ||
5262 | C : Comp2; | |
5263 | Proc ((Comp1 &) &VIEW_CONVERT_EXPR <Comp1> (C)); | |
5264 | ||
5265 | and gimplified into: | |
5266 | ||
5267 | C : Comp2; | |
5268 | Comp1 *C.0; | |
5269 | C.0 = (Comp1 *) &C; | |
5270 | Proc (C.0); | |
5271 | ||
5272 | i.e. generates code involving type punning. Therefore, Comp1 needs | |
5273 | to conflict with Comp2 and an alias set copy is required. | |
5274 | ||
794511d2 | 5275 | The language rules ensure the parent type is already frozen here. */ |
9d11273c EB |
5276 | if (kind != E_Subprogram_Type |
5277 | && Is_Derived_Type (gnat_entity) | |
5278 | && !type_annotate_only) | |
794511d2 | 5279 | { |
384e3fb1 | 5280 | Entity_Id gnat_parent_type = Underlying_Type (Etype (gnat_entity)); |
8c44fc0f EB |
5281 | /* For constrained packed array subtypes, the implementation type is |
5282 | used instead of the nominal type. */ | |
384e3fb1 | 5283 | if (kind == E_Array_Subtype |
8c44fc0f | 5284 | && Is_Constrained (gnat_entity) |
384e3fb1 JM |
5285 | && Present (Packed_Array_Impl_Type (gnat_parent_type))) |
5286 | gnat_parent_type = Packed_Array_Impl_Type (gnat_parent_type); | |
5287 | relate_alias_sets (gnu_type, gnat_to_gnu_type (gnat_parent_type), | |
d8e94f79 EB |
5288 | Is_Composite_Type (gnat_entity) |
5289 | ? ALIAS_SET_COPY : ALIAS_SET_SUPERSET); | |
794511d2 EB |
5290 | } |
5291 | ||
a1ab4c31 AC |
5292 | /* Back-annotate the Alignment of the type if not already in the |
5293 | tree. Likewise for sizes. */ | |
5294 | if (Unknown_Alignment (gnat_entity)) | |
caa9d12a EB |
5295 | { |
5296 | unsigned int double_align, align; | |
5297 | bool is_capped_double, align_clause; | |
5298 | ||
5299 | /* If the default alignment of "double" or larger scalar types is | |
5300 | specifically capped and this is not an array with an alignment | |
5301 | clause on the component type, return the cap. */ | |
5302 | if ((double_align = double_float_alignment) > 0) | |
5303 | is_capped_double | |
5304 | = is_double_float_or_array (gnat_entity, &align_clause); | |
5305 | else if ((double_align = double_scalar_alignment) > 0) | |
5306 | is_capped_double | |
5307 | = is_double_scalar_or_array (gnat_entity, &align_clause); | |
5308 | else | |
5309 | is_capped_double = align_clause = false; | |
5310 | ||
5311 | if (is_capped_double && !align_clause) | |
5312 | align = double_align; | |
5313 | else | |
5314 | align = TYPE_ALIGN (gnu_type) / BITS_PER_UNIT; | |
5315 | ||
5316 | Set_Alignment (gnat_entity, UI_From_Int (align)); | |
5317 | } | |
a1ab4c31 AC |
5318 | |
5319 | if (Unknown_Esize (gnat_entity) && TYPE_SIZE (gnu_type)) | |
5320 | { | |
a1ab4c31 AC |
5321 | tree gnu_size = TYPE_SIZE (gnu_type); |
5322 | ||
58c8f770 | 5323 | /* If the size is self-referential, annotate the maximum value. */ |
a1ab4c31 AC |
5324 | if (CONTAINS_PLACEHOLDER_P (gnu_size)) |
5325 | gnu_size = max_size (gnu_size, true); | |
5326 | ||
b38086f0 EB |
5327 | /* If we are just annotating types and the type is tagged, the tag |
5328 | and the parent components are not generated by the front-end so | |
c00d5b12 | 5329 | alignment and sizes must be adjusted if there is no rep clause. */ |
b38086f0 EB |
5330 | if (type_annotate_only |
5331 | && Is_Tagged_Type (gnat_entity) | |
c00d5b12 | 5332 | && Unknown_RM_Size (gnat_entity) |
b38086f0 EB |
5333 | && !VOID_TYPE_P (gnu_type) |
5334 | && (!TYPE_FIELDS (gnu_type) | |
5335 | || integer_zerop (bit_position (TYPE_FIELDS (gnu_type))))) | |
a1ab4c31 | 5336 | { |
c00d5b12 | 5337 | tree offset; |
a1ab4c31 AC |
5338 | |
5339 | if (Is_Derived_Type (gnat_entity)) | |
5340 | { | |
b38086f0 EB |
5341 | Entity_Id gnat_parent = Etype (Base_Type (gnat_entity)); |
5342 | offset = UI_To_gnu (Esize (gnat_parent), bitsizetype); | |
5343 | Set_Alignment (gnat_entity, Alignment (gnat_parent)); | |
a1ab4c31 AC |
5344 | } |
5345 | else | |
c00d5b12 EB |
5346 | { |
5347 | unsigned int align | |
5348 | = MAX (TYPE_ALIGN (gnu_type), POINTER_SIZE) / BITS_PER_UNIT; | |
5349 | offset = bitsize_int (POINTER_SIZE); | |
5350 | Set_Alignment (gnat_entity, UI_From_Int (align)); | |
5351 | } | |
58c8f770 | 5352 | |
b38086f0 EB |
5353 | if (TYPE_FIELDS (gnu_type)) |
5354 | offset | |
5355 | = round_up (offset, DECL_ALIGN (TYPE_FIELDS (gnu_type))); | |
5356 | ||
58c8f770 | 5357 | gnu_size = size_binop (PLUS_EXPR, gnu_size, offset); |
b38086f0 | 5358 | gnu_size = round_up (gnu_size, POINTER_SIZE); |
c00d5b12 | 5359 | Uint uint_size = annotate_value (gnu_size); |
58c8f770 | 5360 | Set_RM_Size (gnat_entity, uint_size); |
c00d5b12 EB |
5361 | Set_Esize (gnat_entity, uint_size); |
5362 | } | |
5363 | ||
5364 | /* If there is a rep clause, only adjust alignment and Esize. */ | |
5365 | else if (type_annotate_only && Is_Tagged_Type (gnat_entity)) | |
5366 | { | |
5367 | unsigned int align | |
5368 | = MAX (TYPE_ALIGN (gnu_type), POINTER_SIZE) / BITS_PER_UNIT; | |
5369 | Set_Alignment (gnat_entity, UI_From_Int (align)); | |
5370 | gnu_size = round_up (gnu_size, POINTER_SIZE); | |
5371 | Set_Esize (gnat_entity, annotate_value (gnu_size)); | |
a1ab4c31 | 5372 | } |
c00d5b12 EB |
5373 | |
5374 | /* Otherwise no adjustment is needed. */ | |
58c8f770 EB |
5375 | else |
5376 | Set_Esize (gnat_entity, annotate_value (gnu_size)); | |
a1ab4c31 AC |
5377 | } |
5378 | ||
5379 | if (Unknown_RM_Size (gnat_entity) && rm_size (gnu_type)) | |
5380 | Set_RM_Size (gnat_entity, annotate_value (rm_size (gnu_type))); | |
5381 | } | |
5382 | ||
a1ab4c31 | 5383 | /* If we haven't already, associate the ..._DECL node that we just made with |
2ddc34ba | 5384 | the input GNAT entity node. */ |
a1ab4c31 AC |
5385 | if (!saved) |
5386 | save_gnu_tree (gnat_entity, gnu_decl, false); | |
5387 | ||
9a30c7c4 AC |
5388 | /* Now we are sure gnat_entity has a corresponding ..._DECL node, |
5389 | eliminate as many deferred computations as possible. */ | |
5390 | process_deferred_decl_context (false); | |
5391 | ||
c1abd261 EB |
5392 | /* If this is an enumeration or floating-point type, we were not able to set |
5393 | the bounds since they refer to the type. These are always static. */ | |
a1ab4c31 | 5394 | if ((kind == E_Enumeration_Type && Present (First_Literal (gnat_entity))) |
e08add8e | 5395 | || (kind == E_Floating_Point_Type)) |
a1ab4c31 AC |
5396 | { |
5397 | tree gnu_scalar_type = gnu_type; | |
84fb43a1 | 5398 | tree gnu_low_bound, gnu_high_bound; |
a1ab4c31 AC |
5399 | |
5400 | /* If this is a padded type, we need to use the underlying type. */ | |
315cff15 | 5401 | if (TYPE_IS_PADDING_P (gnu_scalar_type)) |
a1ab4c31 AC |
5402 | gnu_scalar_type = TREE_TYPE (TYPE_FIELDS (gnu_scalar_type)); |
5403 | ||
5404 | /* If this is a floating point type and we haven't set a floating | |
5405 | point type yet, use this in the evaluation of the bounds. */ | |
5406 | if (!longest_float_type_node && kind == E_Floating_Point_Type) | |
c1abd261 | 5407 | longest_float_type_node = gnu_scalar_type; |
a1ab4c31 | 5408 | |
84fb43a1 EB |
5409 | gnu_low_bound = gnat_to_gnu (Type_Low_Bound (gnat_entity)); |
5410 | gnu_high_bound = gnat_to_gnu (Type_High_Bound (gnat_entity)); | |
a1ab4c31 | 5411 | |
c1abd261 | 5412 | if (kind == E_Enumeration_Type) |
a1ab4c31 | 5413 | { |
84fb43a1 EB |
5414 | /* Enumeration types have specific RM bounds. */ |
5415 | SET_TYPE_RM_MIN_VALUE (gnu_scalar_type, gnu_low_bound); | |
5416 | SET_TYPE_RM_MAX_VALUE (gnu_scalar_type, gnu_high_bound); | |
a1ab4c31 | 5417 | } |
84fb43a1 EB |
5418 | else |
5419 | { | |
5420 | /* Floating-point types don't have specific RM bounds. */ | |
5421 | TYPE_GCC_MIN_VALUE (gnu_scalar_type) = gnu_low_bound; | |
5422 | TYPE_GCC_MAX_VALUE (gnu_scalar_type) = gnu_high_bound; | |
5423 | } | |
a1ab4c31 AC |
5424 | } |
5425 | ||
5426 | /* If we deferred processing of incomplete types, re-enable it. If there | |
80ec8b4c EB |
5427 | were no other disables and we have deferred types to process, do so. */ |
5428 | if (this_deferred | |
5429 | && --defer_incomplete_level == 0 | |
5430 | && defer_incomplete_list) | |
a1ab4c31 | 5431 | { |
80ec8b4c | 5432 | struct incomplete *p, *next; |
a1ab4c31 | 5433 | |
80ec8b4c EB |
5434 | /* We are back to level 0 for the deferring of incomplete types. |
5435 | But processing these incomplete types below may itself require | |
5436 | deferring, so preserve what we have and restart from scratch. */ | |
5437 | p = defer_incomplete_list; | |
5438 | defer_incomplete_list = NULL; | |
a1ab4c31 | 5439 | |
80ec8b4c EB |
5440 | for (; p; p = next) |
5441 | { | |
5442 | next = p->next; | |
a1ab4c31 | 5443 | |
80ec8b4c EB |
5444 | if (p->old_type) |
5445 | update_pointer_to (TYPE_MAIN_VARIANT (p->old_type), | |
5446 | gnat_to_gnu_type (p->full_type)); | |
5447 | free (p); | |
a1ab4c31 | 5448 | } |
a1ab4c31 AC |
5449 | } |
5450 | ||
6ddf9843 EB |
5451 | /* If we are not defining this type, see if it's on one of the lists of |
5452 | incomplete types. If so, handle the list entry now. */ | |
5453 | if (is_type && !definition) | |
a1ab4c31 | 5454 | { |
6ddf9843 | 5455 | struct incomplete *p; |
a1ab4c31 | 5456 | |
6ddf9843 EB |
5457 | for (p = defer_incomplete_list; p; p = p->next) |
5458 | if (p->old_type && p->full_type == gnat_entity) | |
a1ab4c31 | 5459 | { |
6ddf9843 | 5460 | update_pointer_to (TYPE_MAIN_VARIANT (p->old_type), |
a1ab4c31 | 5461 | TREE_TYPE (gnu_decl)); |
6ddf9843 EB |
5462 | p->old_type = NULL_TREE; |
5463 | } | |
5464 | ||
5465 | for (p = defer_limited_with; p; p = p->next) | |
5466 | if (p->old_type && Non_Limited_View (p->full_type) == gnat_entity) | |
5467 | { | |
5468 | update_pointer_to (TYPE_MAIN_VARIANT (p->old_type), | |
5469 | TREE_TYPE (gnu_decl)); | |
5470 | p->old_type = NULL_TREE; | |
a1ab4c31 AC |
5471 | } |
5472 | } | |
5473 | ||
5474 | if (this_global) | |
5475 | force_global--; | |
5476 | ||
b4680ca1 EB |
5477 | /* If this is a packed array type whose original array type is itself |
5478 | an Itype without freeze node, make sure the latter is processed. */ | |
1a4cb227 | 5479 | if (Is_Packed_Array_Impl_Type (gnat_entity) |
b4680ca1 EB |
5480 | && Is_Itype (Original_Array_Type (gnat_entity)) |
5481 | && No (Freeze_Node (Original_Array_Type (gnat_entity))) | |
5482 | && !present_gnu_tree (Original_Array_Type (gnat_entity))) | |
5483 | gnat_to_gnu_entity (Original_Array_Type (gnat_entity), NULL_TREE, 0); | |
a1ab4c31 AC |
5484 | |
5485 | return gnu_decl; | |
5486 | } | |
5487 | ||
5488 | /* Similar, but if the returned value is a COMPONENT_REF, return the | |
5489 | FIELD_DECL. */ | |
5490 | ||
5491 | tree | |
5492 | gnat_to_gnu_field_decl (Entity_Id gnat_entity) | |
5493 | { | |
5494 | tree gnu_field = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0); | |
5495 | ||
5496 | if (TREE_CODE (gnu_field) == COMPONENT_REF) | |
5497 | gnu_field = TREE_OPERAND (gnu_field, 1); | |
5498 | ||
5499 | return gnu_field; | |
5500 | } | |
5501 | ||
229077b0 EB |
5502 | /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return |
5503 | the GCC type corresponding to that entity. */ | |
5504 | ||
5505 | tree | |
5506 | gnat_to_gnu_type (Entity_Id gnat_entity) | |
5507 | { | |
5508 | tree gnu_decl; | |
5509 | ||
5510 | /* The back end never attempts to annotate generic types. */ | |
5511 | if (Is_Generic_Type (gnat_entity) && type_annotate_only) | |
5512 | return void_type_node; | |
5513 | ||
5514 | gnu_decl = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0); | |
5515 | gcc_assert (TREE_CODE (gnu_decl) == TYPE_DECL); | |
5516 | ||
5517 | return TREE_TYPE (gnu_decl); | |
5518 | } | |
5519 | ||
5520 | /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return | |
5521 | the unpadded version of the GCC type corresponding to that entity. */ | |
5522 | ||
5523 | tree | |
5524 | get_unpadded_type (Entity_Id gnat_entity) | |
5525 | { | |
5526 | tree type = gnat_to_gnu_type (gnat_entity); | |
5527 | ||
315cff15 | 5528 | if (TYPE_IS_PADDING_P (type)) |
229077b0 EB |
5529 | type = TREE_TYPE (TYPE_FIELDS (type)); |
5530 | ||
5531 | return type; | |
5532 | } | |
1228a6a6 EB |
5533 | |
5534 | /* Return the DECL associated with the public subprogram GNAT_ENTITY but whose | |
5535 | type has been changed to that of the parameterless procedure, except if an | |
5536 | alias is already present, in which case it is returned instead. */ | |
5537 | ||
5538 | tree | |
5539 | get_minimal_subprog_decl (Entity_Id gnat_entity) | |
5540 | { | |
5541 | tree gnu_entity_name, gnu_ext_name; | |
5542 | struct attrib *attr_list = NULL; | |
5543 | ||
5544 | /* See the E_Function/E_Procedure case of gnat_to_gnu_entity for the model | |
5545 | of the handling applied here. */ | |
5546 | ||
5547 | while (Present (Alias (gnat_entity))) | |
5548 | { | |
5549 | gnat_entity = Alias (gnat_entity); | |
5550 | if (present_gnu_tree (gnat_entity)) | |
5551 | return get_gnu_tree (gnat_entity); | |
5552 | } | |
5553 | ||
5554 | gnu_entity_name = get_entity_name (gnat_entity); | |
5555 | gnu_ext_name = create_concat_name (gnat_entity, NULL); | |
5556 | ||
5557 | if (Has_Stdcall_Convention (gnat_entity)) | |
0567ae8d AC |
5558 | prepend_one_attribute (&attr_list, ATTR_MACHINE_ATTRIBUTE, |
5559 | get_identifier ("stdcall"), NULL_TREE, | |
5560 | gnat_entity); | |
28dd0055 | 5561 | else if (Has_Thiscall_Convention (gnat_entity)) |
0567ae8d AC |
5562 | prepend_one_attribute (&attr_list, ATTR_MACHINE_ATTRIBUTE, |
5563 | get_identifier ("thiscall"), NULL_TREE, | |
5564 | gnat_entity); | |
1228a6a6 EB |
5565 | |
5566 | if (No (Interface_Name (gnat_entity)) && gnu_ext_name == gnu_entity_name) | |
5567 | gnu_ext_name = NULL_TREE; | |
5568 | ||
5569 | return | |
5570 | create_subprog_decl (gnu_entity_name, gnu_ext_name, void_ftype, NULL_TREE, | |
2056c5ed EB |
5571 | is_disabled, false, true, true, false, true, false, |
5572 | attr_list, gnat_entity); | |
1228a6a6 | 5573 | } |
a1ab4c31 | 5574 | |
28dd0055 EB |
5575 | /* Return whether the E_Subprogram_Type/E_Function/E_Procedure GNAT_ENTITY is |
5576 | a C++ imported method or equivalent. | |
5577 | ||
5578 | We use the predicate on 32-bit x86/Windows to find out whether we need to | |
5579 | use the "thiscall" calling convention for GNAT_ENTITY. This convention is | |
5580 | used for C++ methods (functions with METHOD_TYPE) by the back-end. */ | |
5581 | ||
5582 | bool | |
5583 | is_cplusplus_method (Entity_Id gnat_entity) | |
5584 | { | |
eae6758d | 5585 | /* Check that the subprogram has C++ convention. */ |
28dd0055 | 5586 | if (Convention (gnat_entity) != Convention_CPP) |
78df6221 | 5587 | return false; |
28dd0055 | 5588 | |
eae6758d EB |
5589 | /* A constructor is a method on the C++ side. We deal with it now because |
5590 | it is declared without the 'this' parameter in the sources and, although | |
5591 | the front-end will create a version with the 'this' parameter for code | |
5592 | generation purposes, we want to return true for both versions. */ | |
5593 | if (Is_Constructor (gnat_entity)) | |
5594 | return true; | |
5595 | ||
5596 | /* And that the type of the first parameter (indirectly) has it too. */ | |
5597 | Entity_Id gnat_first = First_Formal (gnat_entity); | |
5598 | if (No (gnat_first)) | |
5599 | return false; | |
5600 | ||
5601 | Entity_Id gnat_type = Etype (gnat_first); | |
5602 | if (Is_Access_Type (gnat_type)) | |
5603 | gnat_type = Directly_Designated_Type (gnat_type); | |
5604 | if (Convention (gnat_type) != Convention_CPP) | |
5605 | return false; | |
5606 | ||
86ceee85 EB |
5607 | /* This is the main case: C++ method imported as a primitive operation. |
5608 | Note that a C++ class with no virtual functions can be imported as a | |
5609 | limited record type so the operation is not necessarily dispatching. */ | |
5610 | if (Is_Primitive (gnat_entity)) | |
78df6221 | 5611 | return true; |
28dd0055 EB |
5612 | |
5613 | /* A thunk needs to be handled like its associated primitive operation. */ | |
5614 | if (Is_Subprogram (gnat_entity) && Is_Thunk (gnat_entity)) | |
78df6221 | 5615 | return true; |
28dd0055 | 5616 | |
28dd0055 EB |
5617 | /* This is set on the E_Subprogram_Type built for a dispatching call. */ |
5618 | if (Is_Dispatch_Table_Entity (gnat_entity)) | |
78df6221 | 5619 | return true; |
28dd0055 | 5620 | |
78df6221 | 5621 | return false; |
28dd0055 EB |
5622 | } |
5623 | ||
7b56a91b | 5624 | /* Finalize the processing of From_Limited_With incomplete types. */ |
a1ab4c31 AC |
5625 | |
5626 | void | |
7b56a91b | 5627 | finalize_from_limited_with (void) |
a1ab4c31 | 5628 | { |
6ddf9843 EB |
5629 | struct incomplete *p, *next; |
5630 | ||
5631 | p = defer_limited_with; | |
5632 | defer_limited_with = NULL; | |
a1ab4c31 | 5633 | |
6ddf9843 | 5634 | for (; p; p = next) |
a1ab4c31 | 5635 | { |
6ddf9843 | 5636 | next = p->next; |
a1ab4c31 | 5637 | |
6ddf9843 EB |
5638 | if (p->old_type) |
5639 | update_pointer_to (TYPE_MAIN_VARIANT (p->old_type), | |
5640 | gnat_to_gnu_type (p->full_type)); | |
5641 | free (p); | |
a1ab4c31 AC |
5642 | } |
5643 | } | |
5644 | ||
5645 | /* Return the equivalent type to be used for GNAT_ENTITY, if it's a | |
5646 | kind of type (such E_Task_Type) that has a different type which Gigi | |
5647 | uses for its representation. If the type does not have a special type | |
5648 | for its representation, return GNAT_ENTITY. If a type is supposed to | |
5649 | exist, but does not, abort unless annotating types, in which case | |
5650 | return Empty. If GNAT_ENTITY is Empty, return Empty. */ | |
5651 | ||
5652 | Entity_Id | |
5653 | Gigi_Equivalent_Type (Entity_Id gnat_entity) | |
5654 | { | |
5655 | Entity_Id gnat_equiv = gnat_entity; | |
5656 | ||
5657 | if (No (gnat_entity)) | |
5658 | return gnat_entity; | |
5659 | ||
5660 | switch (Ekind (gnat_entity)) | |
5661 | { | |
5662 | case E_Class_Wide_Subtype: | |
5663 | if (Present (Equivalent_Type (gnat_entity))) | |
5664 | gnat_equiv = Equivalent_Type (gnat_entity); | |
5665 | break; | |
5666 | ||
5667 | case E_Access_Protected_Subprogram_Type: | |
5668 | case E_Anonymous_Access_Protected_Subprogram_Type: | |
5669 | gnat_equiv = Equivalent_Type (gnat_entity); | |
5670 | break; | |
5671 | ||
5672 | case E_Class_Wide_Type: | |
cbae498b | 5673 | gnat_equiv = Root_Type (gnat_entity); |
a1ab4c31 AC |
5674 | break; |
5675 | ||
5676 | case E_Task_Type: | |
5677 | case E_Task_Subtype: | |
5678 | case E_Protected_Type: | |
5679 | case E_Protected_Subtype: | |
5680 | gnat_equiv = Corresponding_Record_Type (gnat_entity); | |
5681 | break; | |
5682 | ||
5683 | default: | |
5684 | break; | |
5685 | } | |
5686 | ||
5687 | gcc_assert (Present (gnat_equiv) || type_annotate_only); | |
1228a6a6 | 5688 | |
a1ab4c31 AC |
5689 | return gnat_equiv; |
5690 | } | |
5691 | ||
2cac6017 EB |
5692 | /* Return a GCC tree for a type corresponding to the component type of the |
5693 | array type or subtype GNAT_ARRAY. DEFINITION is true if this component | |
5694 | is for an array being defined. DEBUG_INFO_P is true if we need to write | |
5695 | debug information for other types that we may create in the process. */ | |
5696 | ||
5697 | static tree | |
5698 | gnat_to_gnu_component_type (Entity_Id gnat_array, bool definition, | |
5699 | bool debug_info_p) | |
5700 | { | |
c020c92b EB |
5701 | const Entity_Id gnat_type = Component_Type (gnat_array); |
5702 | tree gnu_type = gnat_to_gnu_type (gnat_type); | |
2cac6017 EB |
5703 | tree gnu_comp_size; |
5704 | ||
5705 | /* Try to get a smaller form of the component if needed. */ | |
5706 | if ((Is_Packed (gnat_array) | |
5707 | || Has_Component_Size_Clause (gnat_array)) | |
5708 | && !Is_Bit_Packed_Array (gnat_array) | |
5709 | && !Has_Aliased_Components (gnat_array) | |
c020c92b | 5710 | && !Strict_Alignment (gnat_type) |
e1e5852c | 5711 | && RECORD_OR_UNION_TYPE_P (gnu_type) |
315cff15 | 5712 | && !TYPE_FAT_POINTER_P (gnu_type) |
cc269bb6 | 5713 | && tree_fits_uhwi_p (TYPE_SIZE (gnu_type))) |
2cac6017 EB |
5714 | gnu_type = make_packable_type (gnu_type, false); |
5715 | ||
5716 | if (Has_Atomic_Components (gnat_array)) | |
86a8ba5b | 5717 | check_ok_for_atomic_type (gnu_type, gnat_array, true); |
2cac6017 EB |
5718 | |
5719 | /* Get and validate any specified Component_Size. */ | |
5720 | gnu_comp_size | |
5721 | = validate_size (Component_Size (gnat_array), gnu_type, gnat_array, | |
5722 | Is_Bit_Packed_Array (gnat_array) ? TYPE_DECL : VAR_DECL, | |
5723 | true, Has_Component_Size_Clause (gnat_array)); | |
5724 | ||
1aa8b1dd EB |
5725 | /* If the array has aliased components and the component size can be zero, |
5726 | force at least unit size to ensure that the components have distinct | |
5727 | addresses. */ | |
5728 | if (!gnu_comp_size | |
5729 | && Has_Aliased_Components (gnat_array) | |
5730 | && (integer_zerop (TYPE_SIZE (gnu_type)) | |
5731 | || (TREE_CODE (gnu_type) == ARRAY_TYPE | |
5732 | && !TREE_CONSTANT (TYPE_SIZE (gnu_type))))) | |
5733 | gnu_comp_size | |
5734 | = size_binop (MAX_EXPR, TYPE_SIZE (gnu_type), bitsize_unit_node); | |
5735 | ||
2cac6017 EB |
5736 | /* If the component type is a RECORD_TYPE that has a self-referential size, |
5737 | then use the maximum size for the component size. */ | |
5738 | if (!gnu_comp_size | |
5739 | && TREE_CODE (gnu_type) == RECORD_TYPE | |
5740 | && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))) | |
5741 | gnu_comp_size = max_size (TYPE_SIZE (gnu_type), true); | |
5742 | ||
5743 | /* Honor the component size. This is not needed for bit-packed arrays. */ | |
5744 | if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_array)) | |
5745 | { | |
5746 | tree orig_type = gnu_type; | |
5747 | unsigned int max_align; | |
5748 | ||
5749 | /* If an alignment is specified, use it as a cap on the component type | |
5750 | so that it can be honored for the whole type. But ignore it for the | |
5751 | original type of packed array types. */ | |
1a4cb227 AC |
5752 | if (No (Packed_Array_Impl_Type (gnat_array)) |
5753 | && Known_Alignment (gnat_array)) | |
2cac6017 EB |
5754 | max_align = validate_alignment (Alignment (gnat_array), gnat_array, 0); |
5755 | else | |
5756 | max_align = 0; | |
5757 | ||
5758 | gnu_type = make_type_from_size (gnu_type, gnu_comp_size, false); | |
5759 | if (max_align > 0 && TYPE_ALIGN (gnu_type) > max_align) | |
5760 | gnu_type = orig_type; | |
5761 | else | |
5762 | orig_type = gnu_type; | |
5763 | ||
5764 | gnu_type = maybe_pad_type (gnu_type, gnu_comp_size, 0, gnat_array, | |
afb4afcd | 5765 | true, false, definition, true); |
2cac6017 EB |
5766 | |
5767 | /* If a padding record was made, declare it now since it will never be | |
5768 | declared otherwise. This is necessary to ensure that its subtrees | |
5769 | are properly marked. */ | |
5770 | if (gnu_type != orig_type && !DECL_P (TYPE_NAME (gnu_type))) | |
74746d49 EB |
5771 | create_type_decl (TYPE_NAME (gnu_type), gnu_type, true, debug_info_p, |
5772 | gnat_array); | |
2cac6017 EB |
5773 | } |
5774 | ||
ee45a32d EB |
5775 | /* If the component type is a padded type made for a non-bit-packed array |
5776 | of scalars with reverse storage order, we need to propagate the reverse | |
5777 | storage order to the padding type since it is the innermost enclosing | |
5778 | aggregate type around the scalar. */ | |
5779 | if (TYPE_IS_PADDING_P (gnu_type) | |
5780 | && Reverse_Storage_Order (gnat_array) | |
5781 | && !Is_Bit_Packed_Array (gnat_array) | |
5782 | && Is_Scalar_Type (gnat_type)) | |
5783 | gnu_type = set_reverse_storage_order_on_pad_type (gnu_type); | |
5784 | ||
c020c92b | 5785 | if (Has_Volatile_Components (gnat_array)) |
f797c2b7 EB |
5786 | { |
5787 | const int quals | |
5788 | = TYPE_QUAL_VOLATILE | |
5789 | | (Has_Atomic_Components (gnat_array) ? TYPE_QUAL_ATOMIC : 0); | |
5790 | gnu_type = change_qualified_type (gnu_type, quals); | |
5791 | } | |
2cac6017 EB |
5792 | |
5793 | return gnu_type; | |
5794 | } | |
5795 | ||
a1ab4c31 AC |
5796 | /* Return a GCC tree for a parameter corresponding to GNAT_PARAM and |
5797 | using MECH as its passing mechanism, to be placed in the parameter | |
5798 | list built for GNAT_SUBPROG. Assume a foreign convention for the | |
5799 | latter if FOREIGN is true. Also set CICO to true if the parameter | |
5800 | must use the copy-in copy-out implementation mechanism. | |
5801 | ||
5802 | The returned tree is a PARM_DECL, except for those cases where no | |
5803 | parameter needs to be actually passed to the subprogram; the type | |
5804 | of this "shadow" parameter is then returned instead. */ | |
5805 | ||
5806 | static tree | |
5807 | gnat_to_gnu_param (Entity_Id gnat_param, Mechanism_Type mech, | |
5808 | Entity_Id gnat_subprog, bool foreign, bool *cico) | |
5809 | { | |
5810 | tree gnu_param_name = get_entity_name (gnat_param); | |
5811 | tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param)); | |
5812 | bool in_param = (Ekind (gnat_param) == E_In_Parameter); | |
5813 | /* The parameter can be indirectly modified if its address is taken. */ | |
5814 | bool ro_param = in_param && !Address_Taken (gnat_param); | |
0c700259 | 5815 | bool by_return = false, by_component_ptr = false; |
491f54a7 | 5816 | bool by_ref = false; |
1ddde8dc | 5817 | bool restricted_aliasing_p = false; |
a1ab4c31 AC |
5818 | tree gnu_param; |
5819 | ||
5820 | /* Copy-return is used only for the first parameter of a valued procedure. | |
5821 | It's a copy mechanism for which a parameter is never allocated. */ | |
5822 | if (mech == By_Copy_Return) | |
5823 | { | |
5824 | gcc_assert (Ekind (gnat_param) == E_Out_Parameter); | |
5825 | mech = By_Copy; | |
5826 | by_return = true; | |
5827 | } | |
5828 | ||
5829 | /* If this is either a foreign function or if the underlying type won't | |
57f4f0d5 EB |
5830 | be passed by reference and is as aligned as the original type, strip |
5831 | off possible padding type. */ | |
315cff15 | 5832 | if (TYPE_IS_PADDING_P (gnu_param_type)) |
a1ab4c31 AC |
5833 | { |
5834 | tree unpadded_type = TREE_TYPE (TYPE_FIELDS (gnu_param_type)); | |
5835 | ||
57f4f0d5 | 5836 | if (foreign |
a1ab4c31 | 5837 | || (!must_pass_by_ref (unpadded_type) |
57f4f0d5 EB |
5838 | && mech != By_Reference |
5839 | && (mech == By_Copy || !default_pass_by_ref (unpadded_type)) | |
5840 | && TYPE_ALIGN (unpadded_type) >= TYPE_ALIGN (gnu_param_type))) | |
a1ab4c31 AC |
5841 | gnu_param_type = unpadded_type; |
5842 | } | |
5843 | ||
5844 | /* If this is a read-only parameter, make a variant of the type that is | |
5845 | read-only. ??? However, if this is an unconstrained array, that type | |
5846 | can be very complex, so skip it for now. Likewise for any other | |
5847 | self-referential type. */ | |
5848 | if (ro_param | |
5849 | && TREE_CODE (gnu_param_type) != UNCONSTRAINED_ARRAY_TYPE | |
5850 | && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_param_type))) | |
4aecc2f8 | 5851 | gnu_param_type = change_qualified_type (gnu_param_type, TYPE_QUAL_CONST); |
a1ab4c31 AC |
5852 | |
5853 | /* For foreign conventions, pass arrays as pointers to the element type. | |
5854 | First check for unconstrained array and get the underlying array. */ | |
5855 | if (foreign && TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE) | |
5856 | gnu_param_type | |
5857 | = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_param_type)))); | |
5858 | ||
2503cb81 OH |
5859 | /* For GCC builtins, pass Address integer types as (void *) */ |
5860 | if (Convention (gnat_subprog) == Convention_Intrinsic | |
5861 | && Present (Interface_Name (gnat_subprog)) | |
6e9ecd1f | 5862 | && Is_Descendant_Of_Address (Etype (gnat_param))) |
1366ba41 | 5863 | gnu_param_type = ptr_type_node; |
2503cb81 | 5864 | |
a1ab4c31 | 5865 | /* Arrays are passed as pointers to element type for foreign conventions. */ |
1eb58520 | 5866 | if (foreign && mech != By_Copy && TREE_CODE (gnu_param_type) == ARRAY_TYPE) |
a1ab4c31 AC |
5867 | { |
5868 | /* Strip off any multi-dimensional entries, then strip | |
5869 | off the last array to get the component type. */ | |
5870 | while (TREE_CODE (TREE_TYPE (gnu_param_type)) == ARRAY_TYPE | |
5871 | && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_param_type))) | |
5872 | gnu_param_type = TREE_TYPE (gnu_param_type); | |
5873 | ||
5874 | by_component_ptr = true; | |
5875 | gnu_param_type = TREE_TYPE (gnu_param_type); | |
5876 | ||
5877 | if (ro_param) | |
4aecc2f8 EB |
5878 | gnu_param_type |
5879 | = change_qualified_type (gnu_param_type, TYPE_QUAL_CONST); | |
a1ab4c31 AC |
5880 | |
5881 | gnu_param_type = build_pointer_type (gnu_param_type); | |
5882 | } | |
5883 | ||
5884 | /* Fat pointers are passed as thin pointers for foreign conventions. */ | |
315cff15 | 5885 | else if (foreign && TYPE_IS_FAT_POINTER_P (gnu_param_type)) |
a1ab4c31 AC |
5886 | gnu_param_type |
5887 | = make_type_from_size (gnu_param_type, size_int (POINTER_SIZE), 0); | |
5888 | ||
5889 | /* If we must pass or were requested to pass by reference, do so. | |
5890 | If we were requested to pass by copy, do so. | |
5891 | Otherwise, for foreign conventions, pass In Out or Out parameters | |
5892 | or aggregates by reference. For COBOL and Fortran, pass all | |
5893 | integer and FP types that way too. For Convention Ada, use | |
5894 | the standard Ada default. */ | |
5895 | else if (must_pass_by_ref (gnu_param_type) | |
5896 | || mech == By_Reference | |
5897 | || (mech != By_Copy | |
5898 | && ((foreign | |
5899 | && (!in_param || AGGREGATE_TYPE_P (gnu_param_type))) | |
5900 | || (foreign | |
5901 | && (Convention (gnat_subprog) == Convention_Fortran | |
5902 | || Convention (gnat_subprog) == Convention_COBOL) | |
5903 | && (INTEGRAL_TYPE_P (gnu_param_type) | |
5904 | || FLOAT_TYPE_P (gnu_param_type))) | |
5905 | || (!foreign | |
5906 | && default_pass_by_ref (gnu_param_type))))) | |
5907 | { | |
1ddde8dc | 5908 | gnu_param_type = build_reference_type (gnu_param_type); |
4f96985d EB |
5909 | /* We take advantage of 6.2(12) by considering that references built for |
5910 | parameters whose type isn't by-ref and for which the mechanism hasn't | |
1ddde8dc EB |
5911 | been forced to by-ref allow only a restricted form of aliasing. */ |
5912 | restricted_aliasing_p | |
a0b8b1b7 | 5913 | = !TYPE_IS_BY_REFERENCE_P (gnu_param_type) && mech != By_Reference; |
a1ab4c31 AC |
5914 | by_ref = true; |
5915 | } | |
5916 | ||
5917 | /* Pass In Out or Out parameters using copy-in copy-out mechanism. */ | |
5918 | else if (!in_param) | |
5919 | *cico = true; | |
5920 | ||
5921 | if (mech == By_Copy && (by_ref || by_component_ptr)) | |
5922 | post_error ("?cannot pass & by copy", gnat_param); | |
5923 | ||
5924 | /* If this is an Out parameter that isn't passed by reference and isn't | |
5925 | a pointer or aggregate, we don't make a PARM_DECL for it. Instead, | |
5926 | it will be a VAR_DECL created when we process the procedure, so just | |
5927 | return its type. For the special parameter of a valued procedure, | |
5928 | never pass it in. | |
5929 | ||
5930 | An exception is made to cover the RM-6.4.1 rule requiring "by copy" | |
5931 | Out parameters with discriminants or implicit initial values to be | |
5932 | handled like In Out parameters. These type are normally built as | |
5933 | aggregates, hence passed by reference, except for some packed arrays | |
3a70ba74 RD |
5934 | which end up encoded in special integer types. Note that scalars can |
5935 | be given implicit initial values using the Default_Value aspect. | |
a1ab4c31 AC |
5936 | |
5937 | The exception we need to make is then for packed arrays of records | |
5938 | with discriminants or implicit initial values. We have no light/easy | |
5939 | way to check for the latter case, so we merely check for packed arrays | |
5940 | of records. This may lead to useless copy-in operations, but in very | |
5941 | rare cases only, as these would be exceptions in a set of already | |
5942 | exceptional situations. */ | |
5943 | if (Ekind (gnat_param) == E_Out_Parameter | |
5944 | && !by_ref | |
5945 | && (by_return | |
1eb58520 | 5946 | || (!POINTER_TYPE_P (gnu_param_type) |
3a70ba74 RD |
5947 | && !AGGREGATE_TYPE_P (gnu_param_type) |
5948 | && !Has_Default_Aspect (Etype (gnat_param)))) | |
a1ab4c31 AC |
5949 | && !(Is_Array_Type (Etype (gnat_param)) |
5950 | && Is_Packed (Etype (gnat_param)) | |
5951 | && Is_Composite_Type (Component_Type (Etype (gnat_param))))) | |
5952 | return gnu_param_type; | |
5953 | ||
5954 | gnu_param = create_param_decl (gnu_param_name, gnu_param_type, | |
5955 | ro_param || by_ref || by_component_ptr); | |
5956 | DECL_BY_REF_P (gnu_param) = by_ref; | |
5957 | DECL_BY_COMPONENT_PTR_P (gnu_param) = by_component_ptr; | |
a1ab4c31 AC |
5958 | DECL_POINTS_TO_READONLY_P (gnu_param) |
5959 | = (ro_param && (by_ref || by_component_ptr)); | |
a1c7d797 | 5960 | DECL_CAN_NEVER_BE_NULL_P (gnu_param) = Can_Never_Be_Null (gnat_param); |
1ddde8dc | 5961 | DECL_RESTRICTED_ALIASING_P (gnu_param) = restricted_aliasing_p; |
a1ab4c31 AC |
5962 | |
5963 | /* If no Mechanism was specified, indicate what we're using, then | |
5964 | back-annotate it. */ | |
5965 | if (mech == Default) | |
5966 | mech = (by_ref || by_component_ptr) ? By_Reference : By_Copy; | |
5967 | ||
5968 | Set_Mechanism (gnat_param, mech); | |
5969 | return gnu_param; | |
5970 | } | |
5971 | ||
cb55aefb EB |
5972 | /* Return true if GNAT_ENTITY is an incomplete entity coming from a limited |
5973 | with of the main unit and whose full view has not been elaborated yet. */ | |
5974 | ||
5975 | static bool | |
5976 | is_from_limited_with_of_main (Entity_Id gnat_entity) | |
5977 | { | |
5978 | /* Class-wide types are always transformed into their root type. */ | |
5979 | if (Ekind (gnat_entity) == E_Class_Wide_Type) | |
5980 | gnat_entity = Root_Type (gnat_entity); | |
5981 | ||
5982 | if (IN (Ekind (gnat_entity), Incomplete_Kind) | |
5983 | && From_Limited_With (gnat_entity)) | |
5984 | { | |
5985 | Entity_Id gnat_full_view = Non_Limited_View (gnat_entity); | |
5986 | ||
5987 | if (present_gnu_tree (gnat_full_view)) | |
5988 | return false; | |
5989 | ||
5990 | return In_Extended_Main_Code_Unit (gnat_full_view); | |
5991 | } | |
5992 | ||
5993 | return false; | |
5994 | } | |
5995 | ||
4aecc2f8 EB |
5996 | /* Like build_qualified_type, but TYPE_QUALS is added to the existing |
5997 | qualifiers on TYPE. */ | |
5998 | ||
5999 | static tree | |
6000 | change_qualified_type (tree type, int type_quals) | |
6001 | { | |
6002 | return build_qualified_type (type, TYPE_QUALS (type) | type_quals); | |
6003 | } | |
6004 | ||
a1ab4c31 AC |
6005 | /* Return true if DISCR1 and DISCR2 represent the same discriminant. */ |
6006 | ||
6007 | static bool | |
6008 | same_discriminant_p (Entity_Id discr1, Entity_Id discr2) | |
6009 | { | |
6010 | while (Present (Corresponding_Discriminant (discr1))) | |
6011 | discr1 = Corresponding_Discriminant (discr1); | |
6012 | ||
6013 | while (Present (Corresponding_Discriminant (discr2))) | |
6014 | discr2 = Corresponding_Discriminant (discr2); | |
6015 | ||
6016 | return | |
6017 | Original_Record_Component (discr1) == Original_Record_Component (discr2); | |
6018 | } | |
6019 | ||
d8e94f79 EB |
6020 | /* Return true if the array type GNU_TYPE, which represents a dimension of |
6021 | GNAT_TYPE, has a non-aliased component in the back-end sense. */ | |
a1ab4c31 AC |
6022 | |
6023 | static bool | |
d8e94f79 | 6024 | array_type_has_nonaliased_component (tree gnu_type, Entity_Id gnat_type) |
a1ab4c31 | 6025 | { |
d8e94f79 EB |
6026 | /* If the array type is not the innermost dimension of the GNAT type, |
6027 | then it has a non-aliased component. */ | |
a1ab4c31 AC |
6028 | if (TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE |
6029 | && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type))) | |
6030 | return true; | |
6031 | ||
d8e94f79 EB |
6032 | /* If the array type has an aliased component in the front-end sense, |
6033 | then it also has an aliased component in the back-end sense. */ | |
a1ab4c31 AC |
6034 | if (Has_Aliased_Components (gnat_type)) |
6035 | return false; | |
6036 | ||
d8e94f79 EB |
6037 | /* If this is a derived type, then it has a non-aliased component if |
6038 | and only if its parent type also has one. */ | |
6039 | if (Is_Derived_Type (gnat_type)) | |
6040 | { | |
6041 | tree gnu_parent_type = gnat_to_gnu_type (Etype (gnat_type)); | |
6042 | int index; | |
6043 | if (TREE_CODE (gnu_parent_type) == UNCONSTRAINED_ARRAY_TYPE) | |
6044 | gnu_parent_type | |
6045 | = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_parent_type)))); | |
6046 | for (index = Number_Dimensions (gnat_type) - 1; index > 0; index--) | |
6047 | gnu_parent_type = TREE_TYPE (gnu_parent_type); | |
6048 | return TYPE_NONALIASED_COMPONENT (gnu_parent_type); | |
6049 | } | |
6050 | ||
6051 | /* Otherwise, rely exclusively on properties of the element type. */ | |
a1ab4c31 AC |
6052 | return type_for_nonaliased_component_p (TREE_TYPE (gnu_type)); |
6053 | } | |
229077b0 EB |
6054 | |
6055 | /* Return true if GNAT_ADDRESS is a value known at compile-time. */ | |
6056 | ||
6057 | static bool | |
6058 | compile_time_known_address_p (Node_Id gnat_address) | |
6059 | { | |
6060 | /* Catch System'To_Address. */ | |
6061 | if (Nkind (gnat_address) == N_Unchecked_Type_Conversion) | |
6062 | gnat_address = Expression (gnat_address); | |
6063 | ||
6064 | return Compile_Time_Known_Value (gnat_address); | |
6065 | } | |
f45f9664 | 6066 | |
58c8f770 EB |
6067 | /* Return true if GNAT_RANGE, a N_Range node, cannot be superflat, i.e. if the |
6068 | inequality HB >= LB-1 is true. LB and HB are the low and high bounds. */ | |
f45f9664 EB |
6069 | |
6070 | static bool | |
fc7a823e | 6071 | cannot_be_superflat (Node_Id gnat_range) |
f45f9664 EB |
6072 | { |
6073 | Node_Id gnat_lb = Low_Bound (gnat_range), gnat_hb = High_Bound (gnat_range); | |
683ebd75 | 6074 | Node_Id scalar_range; |
1081f5a7 | 6075 | tree gnu_lb, gnu_hb, gnu_lb_minus_one; |
f45f9664 EB |
6076 | |
6077 | /* If the low bound is not constant, try to find an upper bound. */ | |
6078 | while (Nkind (gnat_lb) != N_Integer_Literal | |
6079 | && (Ekind (Etype (gnat_lb)) == E_Signed_Integer_Subtype | |
6080 | || Ekind (Etype (gnat_lb)) == E_Modular_Integer_Subtype) | |
683ebd75 OH |
6081 | && (scalar_range = Scalar_Range (Etype (gnat_lb))) |
6082 | && (Nkind (scalar_range) == N_Signed_Integer_Type_Definition | |
6083 | || Nkind (scalar_range) == N_Range)) | |
6084 | gnat_lb = High_Bound (scalar_range); | |
f45f9664 EB |
6085 | |
6086 | /* If the high bound is not constant, try to find a lower bound. */ | |
6087 | while (Nkind (gnat_hb) != N_Integer_Literal | |
6088 | && (Ekind (Etype (gnat_hb)) == E_Signed_Integer_Subtype | |
6089 | || Ekind (Etype (gnat_hb)) == E_Modular_Integer_Subtype) | |
683ebd75 OH |
6090 | && (scalar_range = Scalar_Range (Etype (gnat_hb))) |
6091 | && (Nkind (scalar_range) == N_Signed_Integer_Type_Definition | |
6092 | || Nkind (scalar_range) == N_Range)) | |
6093 | gnat_hb = Low_Bound (scalar_range); | |
f45f9664 | 6094 | |
1081f5a7 EB |
6095 | /* If we have failed to find constant bounds, punt. */ |
6096 | if (Nkind (gnat_lb) != N_Integer_Literal | |
6097 | || Nkind (gnat_hb) != N_Integer_Literal) | |
f45f9664 EB |
6098 | return false; |
6099 | ||
1081f5a7 EB |
6100 | /* We need at least a signed 64-bit type to catch most cases. */ |
6101 | gnu_lb = UI_To_gnu (Intval (gnat_lb), sbitsizetype); | |
6102 | gnu_hb = UI_To_gnu (Intval (gnat_hb), sbitsizetype); | |
6103 | if (TREE_OVERFLOW (gnu_lb) || TREE_OVERFLOW (gnu_hb)) | |
6104 | return false; | |
f45f9664 EB |
6105 | |
6106 | /* If the low bound is the smallest integer, nothing can be smaller. */ | |
1081f5a7 EB |
6107 | gnu_lb_minus_one = size_binop (MINUS_EXPR, gnu_lb, sbitsize_one_node); |
6108 | if (TREE_OVERFLOW (gnu_lb_minus_one)) | |
f45f9664 EB |
6109 | return true; |
6110 | ||
1081f5a7 | 6111 | return !tree_int_cst_lt (gnu_hb, gnu_lb_minus_one); |
f45f9664 | 6112 | } |
cb3d597d EB |
6113 | |
6114 | /* Return true if GNU_EXPR is (essentially) the address of a CONSTRUCTOR. */ | |
6115 | ||
6116 | static bool | |
6117 | constructor_address_p (tree gnu_expr) | |
6118 | { | |
6119 | while (TREE_CODE (gnu_expr) == NOP_EXPR | |
6120 | || TREE_CODE (gnu_expr) == CONVERT_EXPR | |
6121 | || TREE_CODE (gnu_expr) == NON_LVALUE_EXPR) | |
6122 | gnu_expr = TREE_OPERAND (gnu_expr, 0); | |
6123 | ||
6124 | return (TREE_CODE (gnu_expr) == ADDR_EXPR | |
6125 | && TREE_CODE (TREE_OPERAND (gnu_expr, 0)) == CONSTRUCTOR); | |
6126 | } | |
fc7a823e EB |
6127 | |
6128 | /* Return true if the size in units represented by GNU_SIZE can be handled by | |
6129 | an allocation. If STATIC_P is true, consider only what can be done with a | |
6130 | static allocation. */ | |
6131 | ||
6132 | static bool | |
6133 | allocatable_size_p (tree gnu_size, bool static_p) | |
6134 | { | |
6135 | /* We can allocate a fixed size if it is a valid for the middle-end. */ | |
6136 | if (TREE_CODE (gnu_size) == INTEGER_CST) | |
6137 | return valid_constant_size_p (gnu_size); | |
6138 | ||
6139 | /* We can allocate a variable size if this isn't a static allocation. */ | |
6140 | else | |
6141 | return !static_p; | |
6142 | } | |
6143 | ||
6144 | /* Return true if GNU_EXPR needs a conversion to GNU_TYPE when used as the | |
6145 | initial value of an object of GNU_TYPE. */ | |
6146 | ||
6147 | static bool | |
6148 | initial_value_needs_conversion (tree gnu_type, tree gnu_expr) | |
6149 | { | |
6150 | /* Do not convert if the object's type is unconstrained because this would | |
6151 | generate useless evaluations of the CONSTRUCTOR to compute the size. */ | |
6152 | if (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE | |
6153 | || CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))) | |
6154 | return false; | |
6155 | ||
6156 | /* Do not convert if the object's type is a padding record whose field is of | |
6157 | self-referential size because we want to copy only the actual data. */ | |
6158 | if (type_is_padding_self_referential (gnu_type)) | |
6159 | return false; | |
6160 | ||
6161 | /* Do not convert a call to a function that returns with variable size since | |
6162 | we want to use the return slot optimization in this case. */ | |
6163 | if (TREE_CODE (gnu_expr) == CALL_EXPR | |
6164 | && return_type_with_variable_size_p (TREE_TYPE (gnu_expr))) | |
6165 | return false; | |
6166 | ||
6167 | /* Do not convert to a record type with a variant part from a record type | |
6168 | without one, to keep the object simpler. */ | |
6169 | if (TREE_CODE (gnu_type) == RECORD_TYPE | |
6170 | && TREE_CODE (TREE_TYPE (gnu_expr)) == RECORD_TYPE | |
7c775aca EB |
6171 | && get_variant_part (gnu_type) |
6172 | && !get_variant_part (TREE_TYPE (gnu_expr))) | |
fc7a823e EB |
6173 | return false; |
6174 | ||
6175 | /* In all the other cases, convert the expression to the object's type. */ | |
6176 | return true; | |
6177 | } | |
a1ab4c31 AC |
6178 | \f |
6179 | /* Given GNAT_ENTITY, elaborate all expressions that are required to | |
6180 | be elaborated at the point of its definition, but do nothing else. */ | |
6181 | ||
6182 | void | |
6183 | elaborate_entity (Entity_Id gnat_entity) | |
6184 | { | |
6185 | switch (Ekind (gnat_entity)) | |
6186 | { | |
6187 | case E_Signed_Integer_Subtype: | |
6188 | case E_Modular_Integer_Subtype: | |
6189 | case E_Enumeration_Subtype: | |
6190 | case E_Ordinary_Fixed_Point_Subtype: | |
6191 | case E_Decimal_Fixed_Point_Subtype: | |
6192 | case E_Floating_Point_Subtype: | |
6193 | { | |
6194 | Node_Id gnat_lb = Type_Low_Bound (gnat_entity); | |
6195 | Node_Id gnat_hb = Type_High_Bound (gnat_entity); | |
6196 | ||
c1abd261 EB |
6197 | /* ??? Tests to avoid Constraint_Error in static expressions |
6198 | are needed until after the front stops generating bogus | |
6199 | conversions on bounds of real types. */ | |
a1ab4c31 | 6200 | if (!Raises_Constraint_Error (gnat_lb)) |
bf44701f EB |
6201 | elaborate_expression (gnat_lb, gnat_entity, "L", true, false, |
6202 | Needs_Debug_Info (gnat_entity)); | |
a1ab4c31 | 6203 | if (!Raises_Constraint_Error (gnat_hb)) |
bf44701f EB |
6204 | elaborate_expression (gnat_hb, gnat_entity, "U", true, false, |
6205 | Needs_Debug_Info (gnat_entity)); | |
a1ab4c31 AC |
6206 | break; |
6207 | } | |
6208 | ||
a1ab4c31 AC |
6209 | case E_Record_Subtype: |
6210 | case E_Private_Subtype: | |
6211 | case E_Limited_Private_Subtype: | |
6212 | case E_Record_Subtype_With_Private: | |
a8c4c75a | 6213 | if (Has_Discriminants (gnat_entity) && Is_Constrained (gnat_entity)) |
a1ab4c31 AC |
6214 | { |
6215 | Node_Id gnat_discriminant_expr; | |
6216 | Entity_Id gnat_field; | |
6217 | ||
8cd28148 EB |
6218 | for (gnat_field |
6219 | = First_Discriminant (Implementation_Base_Type (gnat_entity)), | |
a1ab4c31 AC |
6220 | gnat_discriminant_expr |
6221 | = First_Elmt (Discriminant_Constraint (gnat_entity)); | |
6222 | Present (gnat_field); | |
6223 | gnat_field = Next_Discriminant (gnat_field), | |
6224 | gnat_discriminant_expr = Next_Elmt (gnat_discriminant_expr)) | |
908ba941 | 6225 | /* Ignore access discriminants. */ |
a1ab4c31 AC |
6226 | if (!Is_Access_Type (Etype (Node (gnat_discriminant_expr)))) |
6227 | elaborate_expression (Node (gnat_discriminant_expr), | |
bf44701f | 6228 | gnat_entity, get_entity_char (gnat_field), |
a531043b | 6229 | true, false, false); |
a1ab4c31 AC |
6230 | } |
6231 | break; | |
6232 | ||
6233 | } | |
6234 | } | |
6235 | \f | |
a1ab4c31 AC |
6236 | /* Prepend to ATTR_LIST an entry for an attribute with provided TYPE, |
6237 | NAME, ARGS and ERROR_POINT. */ | |
6238 | ||
6239 | static void | |
0567ae8d | 6240 | prepend_one_attribute (struct attrib **attr_list, |
e0ef6912 | 6241 | enum attrib_type attrib_type, |
0567ae8d AC |
6242 | tree attr_name, |
6243 | tree attr_args, | |
6244 | Node_Id attr_error_point) | |
a1ab4c31 AC |
6245 | { |
6246 | struct attrib * attr = (struct attrib *) xmalloc (sizeof (struct attrib)); | |
6247 | ||
e0ef6912 | 6248 | attr->type = attrib_type; |
a1ab4c31 AC |
6249 | attr->name = attr_name; |
6250 | attr->args = attr_args; | |
6251 | attr->error_point = attr_error_point; | |
6252 | ||
6253 | attr->next = *attr_list; | |
6254 | *attr_list = attr; | |
6255 | } | |
6256 | ||
0567ae8d | 6257 | /* Prepend to ATTR_LIST an entry for an attribute provided by GNAT_PRAGMA. */ |
a1ab4c31 AC |
6258 | |
6259 | static void | |
0567ae8d | 6260 | prepend_one_attribute_pragma (struct attrib **attr_list, Node_Id gnat_pragma) |
a1ab4c31 | 6261 | { |
0567ae8d AC |
6262 | const Node_Id gnat_arg = Pragma_Argument_Associations (gnat_pragma); |
6263 | tree gnu_arg0 = NULL_TREE, gnu_arg1 = NULL_TREE; | |
e0ef6912 | 6264 | enum attrib_type etype; |
d81b4c61 | 6265 | |
0567ae8d AC |
6266 | /* Map the pragma at hand. Skip if this isn't one we know how to handle. */ |
6267 | switch (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_pragma)))) | |
6268 | { | |
6269 | case Pragma_Machine_Attribute: | |
6270 | etype = ATTR_MACHINE_ATTRIBUTE; | |
6271 | break; | |
a1ab4c31 | 6272 | |
0567ae8d AC |
6273 | case Pragma_Linker_Alias: |
6274 | etype = ATTR_LINK_ALIAS; | |
6275 | break; | |
a1ab4c31 | 6276 | |
0567ae8d AC |
6277 | case Pragma_Linker_Section: |
6278 | etype = ATTR_LINK_SECTION; | |
6279 | break; | |
a1ab4c31 | 6280 | |
0567ae8d AC |
6281 | case Pragma_Linker_Constructor: |
6282 | etype = ATTR_LINK_CONSTRUCTOR; | |
6283 | break; | |
a1ab4c31 | 6284 | |
0567ae8d AC |
6285 | case Pragma_Linker_Destructor: |
6286 | etype = ATTR_LINK_DESTRUCTOR; | |
6287 | break; | |
a1ab4c31 | 6288 | |
0567ae8d AC |
6289 | case Pragma_Weak_External: |
6290 | etype = ATTR_WEAK_EXTERNAL; | |
6291 | break; | |
a1ab4c31 | 6292 | |
0567ae8d AC |
6293 | case Pragma_Thread_Local_Storage: |
6294 | etype = ATTR_THREAD_LOCAL_STORAGE; | |
6295 | break; | |
a1ab4c31 | 6296 | |
0567ae8d AC |
6297 | default: |
6298 | return; | |
6299 | } | |
a1ab4c31 | 6300 | |
0567ae8d AC |
6301 | /* See what arguments we have and turn them into GCC trees for attribute |
6302 | handlers. These expect identifier for strings. We handle at most two | |
6303 | arguments and static expressions only. */ | |
6304 | if (Present (gnat_arg) && Present (First (gnat_arg))) | |
6305 | { | |
6306 | Node_Id gnat_arg0 = Next (First (gnat_arg)); | |
6307 | Node_Id gnat_arg1 = Empty; | |
40a14772 | 6308 | |
bd6a077a EB |
6309 | if (Present (gnat_arg0) |
6310 | && Is_OK_Static_Expression (Expression (gnat_arg0))) | |
0567ae8d AC |
6311 | { |
6312 | gnu_arg0 = gnat_to_gnu (Expression (gnat_arg0)); | |
a1ab4c31 | 6313 | |
0567ae8d AC |
6314 | if (TREE_CODE (gnu_arg0) == STRING_CST) |
6315 | { | |
6316 | gnu_arg0 = get_identifier (TREE_STRING_POINTER (gnu_arg0)); | |
6317 | if (IDENTIFIER_LENGTH (gnu_arg0) == 0) | |
6318 | return; | |
6319 | } | |
d81b4c61 | 6320 | |
0567ae8d AC |
6321 | gnat_arg1 = Next (gnat_arg0); |
6322 | } | |
d81b4c61 | 6323 | |
bd6a077a EB |
6324 | if (Present (gnat_arg1) |
6325 | && Is_OK_Static_Expression (Expression (gnat_arg1))) | |
0567ae8d AC |
6326 | { |
6327 | gnu_arg1 = gnat_to_gnu (Expression (gnat_arg1)); | |
d81b4c61 | 6328 | |
0567ae8d AC |
6329 | if (TREE_CODE (gnu_arg1) == STRING_CST) |
6330 | gnu_arg1 = get_identifier (TREE_STRING_POINTER (gnu_arg1)); | |
6331 | } | |
6332 | } | |
d81b4c61 | 6333 | |
0567ae8d AC |
6334 | /* Prepend to the list. Make a list of the argument we might have, as GCC |
6335 | expects it. */ | |
6336 | prepend_one_attribute (attr_list, etype, gnu_arg0, | |
6337 | gnu_arg1 | |
6338 | ? build_tree_list (NULL_TREE, gnu_arg1) : NULL_TREE, | |
6339 | Present (Next (First (gnat_arg))) | |
6340 | ? Expression (Next (First (gnat_arg))) : gnat_pragma); | |
6341 | } | |
d81b4c61 | 6342 | |
0567ae8d | 6343 | /* Prepend to ATTR_LIST the list of attributes for GNAT_ENTITY, if any. */ |
d81b4c61 | 6344 | |
0567ae8d AC |
6345 | static void |
6346 | prepend_attributes (struct attrib **attr_list, Entity_Id gnat_entity) | |
6347 | { | |
6348 | Node_Id gnat_temp; | |
a1ab4c31 | 6349 | |
0567ae8d AC |
6350 | /* Attributes are stored as Representation Item pragmas. */ |
6351 | for (gnat_temp = First_Rep_Item (gnat_entity); | |
6352 | Present (gnat_temp); | |
6353 | gnat_temp = Next_Rep_Item (gnat_temp)) | |
6354 | if (Nkind (gnat_temp) == N_Pragma) | |
6355 | prepend_one_attribute_pragma (attr_list, gnat_temp); | |
a1ab4c31 AC |
6356 | } |
6357 | \f | |
a1ab4c31 AC |
6358 | /* Given a GNAT tree GNAT_EXPR, for an expression which is a value within a |
6359 | type definition (either a bound or a discriminant value) for GNAT_ENTITY, | |
bf44701f | 6360 | return the GCC tree to use for that expression. S is the suffix to use |
241125b2 | 6361 | if a variable needs to be created and DEFINITION is true if this is done |
bf44701f | 6362 | for a definition of GNAT_ENTITY. If NEED_VALUE is true, we need a result; |
a531043b EB |
6363 | otherwise, we are just elaborating the expression for side-effects. If |
6364 | NEED_DEBUG is true, we need a variable for debugging purposes even if it | |
1e17ef87 | 6365 | isn't needed for code generation. */ |
a1ab4c31 AC |
6366 | |
6367 | static tree | |
bf44701f | 6368 | elaborate_expression (Node_Id gnat_expr, Entity_Id gnat_entity, const char *s, |
a531043b | 6369 | bool definition, bool need_value, bool need_debug) |
a1ab4c31 AC |
6370 | { |
6371 | tree gnu_expr; | |
6372 | ||
a531043b | 6373 | /* If we already elaborated this expression (e.g. it was involved |
a1ab4c31 AC |
6374 | in the definition of a private type), use the old value. */ |
6375 | if (present_gnu_tree (gnat_expr)) | |
6376 | return get_gnu_tree (gnat_expr); | |
6377 | ||
a531043b EB |
6378 | /* If we don't need a value and this is static or a discriminant, |
6379 | we don't need to do anything. */ | |
6380 | if (!need_value | |
6381 | && (Is_OK_Static_Expression (gnat_expr) | |
6382 | || (Nkind (gnat_expr) == N_Identifier | |
6383 | && Ekind (Entity (gnat_expr)) == E_Discriminant))) | |
6384 | return NULL_TREE; | |
6385 | ||
6386 | /* If it's a static expression, we don't need a variable for debugging. */ | |
6387 | if (need_debug && Is_OK_Static_Expression (gnat_expr)) | |
6388 | need_debug = false; | |
a1ab4c31 | 6389 | |
a531043b | 6390 | /* Otherwise, convert this tree to its GCC equivalent and elaborate it. */ |
bf44701f EB |
6391 | gnu_expr = elaborate_expression_1 (gnat_to_gnu (gnat_expr), gnat_entity, s, |
6392 | definition, need_debug); | |
a1ab4c31 AC |
6393 | |
6394 | /* Save the expression in case we try to elaborate this entity again. Since | |
2ddc34ba | 6395 | it's not a DECL, don't check it. Don't save if it's a discriminant. */ |
a1ab4c31 AC |
6396 | if (!CONTAINS_PLACEHOLDER_P (gnu_expr)) |
6397 | save_gnu_tree (gnat_expr, gnu_expr, true); | |
6398 | ||
6399 | return need_value ? gnu_expr : error_mark_node; | |
6400 | } | |
6401 | ||
a531043b | 6402 | /* Similar, but take a GNU expression and always return a result. */ |
a1ab4c31 AC |
6403 | |
6404 | static tree | |
bf44701f | 6405 | elaborate_expression_1 (tree gnu_expr, Entity_Id gnat_entity, const char *s, |
a531043b | 6406 | bool definition, bool need_debug) |
a1ab4c31 | 6407 | { |
1586f8a3 EB |
6408 | const bool expr_public_p = Is_Public (gnat_entity); |
6409 | const bool expr_global_p = expr_public_p || global_bindings_p (); | |
646f9414 | 6410 | bool expr_variable_p, use_variable; |
a1ab4c31 | 6411 | |
f230d759 EB |
6412 | /* If GNU_EXPR contains a placeholder, just return it. We rely on the fact |
6413 | that an expression cannot contain both a discriminant and a variable. */ | |
6414 | if (CONTAINS_PLACEHOLDER_P (gnu_expr)) | |
6415 | return gnu_expr; | |
6416 | ||
6417 | /* If GNU_EXPR is neither a constant nor based on a read-only variable, make | |
6418 | a variable that is initialized to contain the expression when the package | |
6419 | containing the definition is elaborated. If this entity is defined at top | |
6420 | level, replace the expression by the variable; otherwise use a SAVE_EXPR | |
6421 | if this is necessary. */ | |
7194767c | 6422 | if (TREE_CONSTANT (gnu_expr)) |
f230d759 EB |
6423 | expr_variable_p = false; |
6424 | else | |
6425 | { | |
966b587e | 6426 | /* Skip any conversions and simple constant arithmetics to see if the |
7194767c | 6427 | expression is based on a read-only variable. */ |
966b587e EB |
6428 | tree inner = remove_conversions (gnu_expr, true); |
6429 | ||
6430 | inner = skip_simple_constant_arithmetic (inner); | |
f230d759 EB |
6431 | |
6432 | if (handled_component_p (inner)) | |
ea292448 | 6433 | inner = get_inner_constant_reference (inner); |
f230d759 EB |
6434 | |
6435 | expr_variable_p | |
6436 | = !(inner | |
6437 | && TREE_CODE (inner) == VAR_DECL | |
6438 | && (TREE_READONLY (inner) || DECL_READONLY_ONCE_ELAB (inner))); | |
6439 | } | |
a1ab4c31 | 6440 | |
646f9414 EB |
6441 | /* We only need to use the variable if we are in a global context since GCC |
6442 | can do the right thing in the local case. However, when not optimizing, | |
6443 | use it for bounds of loop iteration scheme to avoid code duplication. */ | |
6444 | use_variable = expr_variable_p | |
6445 | && (expr_global_p | |
6446 | || (!optimize | |
f563ce55 | 6447 | && definition |
646f9414 EB |
6448 | && Is_Itype (gnat_entity) |
6449 | && Nkind (Associated_Node_For_Itype (gnat_entity)) | |
6450 | == N_Loop_Parameter_Specification)); | |
6451 | ||
6452 | /* Now create it, possibly only for debugging purposes. */ | |
6453 | if (use_variable || need_debug) | |
bf7eefab | 6454 | { |
bf44701f EB |
6455 | /* The following variable creation can happen when processing the body |
6456 | of subprograms that are defined out of the extended main unit and | |
6457 | inlined. In this case, we are not at the global scope, and thus the | |
9a30c7c4 | 6458 | new variable must not be tagged "external", as we used to do here as |
bf44701f | 6459 | soon as DEFINITION was false. */ |
bf7eefab | 6460 | tree gnu_decl |
c1a569ef EB |
6461 | = create_var_decl (create_concat_name (gnat_entity, s), NULL_TREE, |
6462 | TREE_TYPE (gnu_expr), gnu_expr, true, | |
6463 | expr_public_p, !definition && expr_global_p, | |
2056c5ed EB |
6464 | expr_global_p, false, true, need_debug, |
6465 | NULL, gnat_entity); | |
9a30c7c4 AC |
6466 | |
6467 | /* Using this variable at debug time (if need_debug is true) requires a | |
6468 | proper location. The back-end will compute a location for this | |
6469 | variable only if the variable is used by the generated code. | |
6470 | Returning the variable ensures the caller will use it in generated | |
6471 | code. Note that there is no need for a location if the debug info | |
6472 | contains an integer constant. | |
ba464315 | 6473 | TODO: when the encoding-based debug scheme is dropped, move this |
9a30c7c4 AC |
6474 | condition to the top-level IF block: we will not need to create a |
6475 | variable anymore in such cases, then. */ | |
6476 | if (use_variable || (need_debug && !TREE_CONSTANT (gnu_expr))) | |
bf7eefab EB |
6477 | return gnu_decl; |
6478 | } | |
a531043b | 6479 | |
f230d759 | 6480 | return expr_variable_p ? gnat_save_expr (gnu_expr) : gnu_expr; |
a1ab4c31 | 6481 | } |
da01bfee EB |
6482 | |
6483 | /* Similar, but take an alignment factor and make it explicit in the tree. */ | |
6484 | ||
6485 | static tree | |
bf44701f | 6486 | elaborate_expression_2 (tree gnu_expr, Entity_Id gnat_entity, const char *s, |
da01bfee EB |
6487 | bool definition, bool need_debug, unsigned int align) |
6488 | { | |
6489 | tree unit_align = size_int (align / BITS_PER_UNIT); | |
6490 | return | |
6491 | size_binop (MULT_EXPR, | |
6492 | elaborate_expression_1 (size_binop (EXACT_DIV_EXPR, | |
6493 | gnu_expr, | |
6494 | unit_align), | |
bf44701f | 6495 | gnat_entity, s, definition, |
da01bfee EB |
6496 | need_debug), |
6497 | unit_align); | |
6498 | } | |
241125b2 EB |
6499 | |
6500 | /* Structure to hold internal data for elaborate_reference. */ | |
6501 | ||
6502 | struct er_data | |
6503 | { | |
6504 | Entity_Id entity; | |
6505 | bool definition; | |
fc7a823e | 6506 | unsigned int n; |
241125b2 EB |
6507 | }; |
6508 | ||
6509 | /* Wrapper function around elaborate_expression_1 for elaborate_reference. */ | |
6510 | ||
6511 | static tree | |
fc7a823e | 6512 | elaborate_reference_1 (tree ref, void *data) |
241125b2 EB |
6513 | { |
6514 | struct er_data *er = (struct er_data *)data; | |
6515 | char suffix[16]; | |
6516 | ||
6517 | /* This is what elaborate_expression_1 does if NEED_DEBUG is false. */ | |
6518 | if (TREE_CONSTANT (ref)) | |
6519 | return ref; | |
6520 | ||
6521 | /* If this is a COMPONENT_REF of a fat pointer, elaborate the entire fat | |
6522 | pointer. This may be more efficient, but will also allow us to more | |
6523 | easily find the match for the PLACEHOLDER_EXPR. */ | |
6524 | if (TREE_CODE (ref) == COMPONENT_REF | |
6525 | && TYPE_IS_FAT_POINTER_P (TREE_TYPE (TREE_OPERAND (ref, 0)))) | |
6526 | return build3 (COMPONENT_REF, TREE_TYPE (ref), | |
fc7a823e | 6527 | elaborate_reference_1 (TREE_OPERAND (ref, 0), data), |
241125b2 EB |
6528 | TREE_OPERAND (ref, 1), TREE_OPERAND (ref, 2)); |
6529 | ||
fc7a823e | 6530 | sprintf (suffix, "EXP%d", ++er->n); |
241125b2 EB |
6531 | return |
6532 | elaborate_expression_1 (ref, er->entity, suffix, er->definition, false); | |
6533 | } | |
6534 | ||
6535 | /* Elaborate the reference REF to be used as renamed object for GNAT_ENTITY. | |
fc7a823e EB |
6536 | DEFINITION is true if this is done for a definition of GNAT_ENTITY and |
6537 | INIT is set to the first arm of a COMPOUND_EXPR present in REF, if any. */ | |
241125b2 EB |
6538 | |
6539 | static tree | |
fc7a823e EB |
6540 | elaborate_reference (tree ref, Entity_Id gnat_entity, bool definition, |
6541 | tree *init) | |
241125b2 | 6542 | { |
fc7a823e EB |
6543 | struct er_data er = { gnat_entity, definition, 0 }; |
6544 | return gnat_rewrite_reference (ref, elaborate_reference_1, &er, init); | |
241125b2 | 6545 | } |
a1ab4c31 | 6546 | \f |
a1ab4c31 AC |
6547 | /* Given a GNU tree and a GNAT list of choices, generate an expression to test |
6548 | the value passed against the list of choices. */ | |
6549 | ||
6550 | tree | |
6551 | choices_to_gnu (tree operand, Node_Id choices) | |
6552 | { | |
6553 | Node_Id choice; | |
6554 | Node_Id gnat_temp; | |
bf6490b5 | 6555 | tree result = boolean_false_node; |
a1ab4c31 AC |
6556 | tree this_test, low = 0, high = 0, single = 0; |
6557 | ||
6558 | for (choice = First (choices); Present (choice); choice = Next (choice)) | |
6559 | { | |
6560 | switch (Nkind (choice)) | |
6561 | { | |
6562 | case N_Range: | |
6563 | low = gnat_to_gnu (Low_Bound (choice)); | |
6564 | high = gnat_to_gnu (High_Bound (choice)); | |
6565 | ||
a1ab4c31 | 6566 | this_test |
1139f2e8 EB |
6567 | = build_binary_op (TRUTH_ANDIF_EXPR, boolean_type_node, |
6568 | build_binary_op (GE_EXPR, boolean_type_node, | |
a1ab4c31 | 6569 | operand, low), |
1139f2e8 | 6570 | build_binary_op (LE_EXPR, boolean_type_node, |
a1ab4c31 AC |
6571 | operand, high)); |
6572 | ||
6573 | break; | |
6574 | ||
6575 | case N_Subtype_Indication: | |
6576 | gnat_temp = Range_Expression (Constraint (choice)); | |
6577 | low = gnat_to_gnu (Low_Bound (gnat_temp)); | |
6578 | high = gnat_to_gnu (High_Bound (gnat_temp)); | |
6579 | ||
6580 | this_test | |
1139f2e8 EB |
6581 | = build_binary_op (TRUTH_ANDIF_EXPR, boolean_type_node, |
6582 | build_binary_op (GE_EXPR, boolean_type_node, | |
a1ab4c31 | 6583 | operand, low), |
1139f2e8 | 6584 | build_binary_op (LE_EXPR, boolean_type_node, |
a1ab4c31 AC |
6585 | operand, high)); |
6586 | break; | |
6587 | ||
6588 | case N_Identifier: | |
6589 | case N_Expanded_Name: | |
6590 | /* This represents either a subtype range, an enumeration | |
6591 | literal, or a constant Ekind says which. If an enumeration | |
6592 | literal or constant, fall through to the next case. */ | |
6593 | if (Ekind (Entity (choice)) != E_Enumeration_Literal | |
6594 | && Ekind (Entity (choice)) != E_Constant) | |
6595 | { | |
6596 | tree type = gnat_to_gnu_type (Entity (choice)); | |
6597 | ||
6598 | low = TYPE_MIN_VALUE (type); | |
6599 | high = TYPE_MAX_VALUE (type); | |
6600 | ||
6601 | this_test | |
1139f2e8 EB |
6602 | = build_binary_op (TRUTH_ANDIF_EXPR, boolean_type_node, |
6603 | build_binary_op (GE_EXPR, boolean_type_node, | |
a1ab4c31 | 6604 | operand, low), |
1139f2e8 | 6605 | build_binary_op (LE_EXPR, boolean_type_node, |
a1ab4c31 AC |
6606 | operand, high)); |
6607 | break; | |
6608 | } | |
2ddc34ba | 6609 | |
a1ab4c31 | 6610 | /* ... fall through ... */ |
2ddc34ba | 6611 | |
a1ab4c31 AC |
6612 | case N_Character_Literal: |
6613 | case N_Integer_Literal: | |
6614 | single = gnat_to_gnu (choice); | |
1139f2e8 | 6615 | this_test = build_binary_op (EQ_EXPR, boolean_type_node, operand, |
a1ab4c31 AC |
6616 | single); |
6617 | break; | |
6618 | ||
6619 | case N_Others_Choice: | |
bf6490b5 | 6620 | this_test = boolean_true_node; |
a1ab4c31 AC |
6621 | break; |
6622 | ||
6623 | default: | |
6624 | gcc_unreachable (); | |
6625 | } | |
6626 | ||
1139f2e8 EB |
6627 | result = build_binary_op (TRUTH_ORIF_EXPR, boolean_type_node, result, |
6628 | this_test); | |
a1ab4c31 AC |
6629 | } |
6630 | ||
6631 | return result; | |
6632 | } | |
6633 | \f | |
6634 | /* Adjust PACKED setting as passed to gnat_to_gnu_field for a field of | |
6635 | type FIELD_TYPE to be placed in RECORD_TYPE. Return the result. */ | |
6636 | ||
6637 | static int | |
6638 | adjust_packed (tree field_type, tree record_type, int packed) | |
6639 | { | |
6640 | /* If the field contains an item of variable size, we cannot pack it | |
6641 | because we cannot create temporaries of non-fixed size in case | |
6642 | we need to take the address of the field. See addressable_p and | |
6643 | the notes on the addressability issues for further details. */ | |
5f2e59d4 | 6644 | if (type_has_variable_size (field_type)) |
a1ab4c31 AC |
6645 | return 0; |
6646 | ||
14ecca2e EB |
6647 | /* In the other cases, we can honor the packing. */ |
6648 | if (packed) | |
6649 | return packed; | |
6650 | ||
a1ab4c31 AC |
6651 | /* If the alignment of the record is specified and the field type |
6652 | is over-aligned, request Storage_Unit alignment for the field. */ | |
14ecca2e EB |
6653 | if (TYPE_ALIGN (record_type) |
6654 | && TYPE_ALIGN (field_type) > TYPE_ALIGN (record_type)) | |
6655 | return -1; | |
6656 | ||
6657 | /* Likewise if the maximum alignment of the record is specified. */ | |
6658 | if (TYPE_MAX_ALIGN (record_type) | |
6659 | && TYPE_ALIGN (field_type) > TYPE_MAX_ALIGN (record_type)) | |
6660 | return -1; | |
a1ab4c31 | 6661 | |
14ecca2e | 6662 | return 0; |
a1ab4c31 AC |
6663 | } |
6664 | ||
6665 | /* Return a GCC tree for a field corresponding to GNAT_FIELD to be | |
6666 | placed in GNU_RECORD_TYPE. | |
6667 | ||
14ecca2e EB |
6668 | PACKED is 1 if the enclosing record is packed or -1 if the enclosing |
6669 | record has Component_Alignment of Storage_Unit. | |
a1ab4c31 | 6670 | |
839f2864 EB |
6671 | DEFINITION is true if this field is for a record being defined. |
6672 | ||
6673 | DEBUG_INFO_P is true if we need to write debug information for types | |
6674 | that we may create in the process. */ | |
a1ab4c31 AC |
6675 | |
6676 | static tree | |
6677 | gnat_to_gnu_field (Entity_Id gnat_field, tree gnu_record_type, int packed, | |
839f2864 | 6678 | bool definition, bool debug_info_p) |
a1ab4c31 | 6679 | { |
c020c92b | 6680 | const Entity_Id gnat_field_type = Etype (gnat_field); |
07aff4e3 | 6681 | const bool is_aliased |
35786aad | 6682 | = Is_Aliased (gnat_field); |
07aff4e3 | 6683 | const bool is_atomic |
f797c2b7 | 6684 | = (Is_Atomic_Or_VFA (gnat_field) || Is_Atomic_Or_VFA (gnat_field_type)); |
07aff4e3 AC |
6685 | const bool is_independent |
6686 | = (Is_Independent (gnat_field) || Is_Independent (gnat_field_type)); | |
6687 | const bool is_volatile | |
c020c92b | 6688 | = (Treat_As_Volatile (gnat_field) || Treat_As_Volatile (gnat_field_type)); |
07aff4e3 AC |
6689 | const bool needs_strict_alignment |
6690 | = (is_aliased | |
6691 | || is_independent | |
6692 | || is_volatile | |
6693 | || Strict_Alignment (gnat_field_type)); | |
6694 | tree gnu_field_type = gnat_to_gnu_type (gnat_field_type); | |
6695 | tree gnu_field_id = get_entity_name (gnat_field); | |
6696 | tree gnu_field, gnu_size, gnu_pos; | |
a1ab4c31 AC |
6697 | |
6698 | /* If this field requires strict alignment, we cannot pack it because | |
6699 | it would very likely be under-aligned in the record. */ | |
6700 | if (needs_strict_alignment) | |
6701 | packed = 0; | |
6702 | else | |
6703 | packed = adjust_packed (gnu_field_type, gnu_record_type, packed); | |
6704 | ||
6705 | /* If a size is specified, use it. Otherwise, if the record type is packed, | |
6706 | use the official RM size. See "Handling of Type'Size Values" in Einfo | |
6707 | for further details. */ | |
fc893455 | 6708 | if (Known_Esize (gnat_field)) |
a1ab4c31 AC |
6709 | gnu_size = validate_size (Esize (gnat_field), gnu_field_type, |
6710 | gnat_field, FIELD_DECL, false, true); | |
6711 | else if (packed == 1) | |
c020c92b | 6712 | gnu_size = validate_size (RM_Size (gnat_field_type), gnu_field_type, |
a1ab4c31 AC |
6713 | gnat_field, FIELD_DECL, false, true); |
6714 | else | |
6715 | gnu_size = NULL_TREE; | |
6716 | ||
d770e88d EB |
6717 | /* If we have a specified size that is smaller than that of the field's type, |
6718 | or a position is specified, and the field's type is a record that doesn't | |
6719 | require strict alignment, see if we can get either an integral mode form | |
6720 | of the type or a smaller form. If we can, show a size was specified for | |
6721 | the field if there wasn't one already, so we know to make this a bitfield | |
6722 | and avoid making things wider. | |
a1ab4c31 | 6723 | |
d770e88d EB |
6724 | Changing to an integral mode form is useful when the record is packed as |
6725 | we can then place the field at a non-byte-aligned position and so achieve | |
6726 | tighter packing. This is in addition required if the field shares a byte | |
6727 | with another field and the front-end lets the back-end handle the access | |
6728 | to the field, because GCC cannot handle non-byte-aligned BLKmode fields. | |
a1ab4c31 | 6729 | |
d770e88d EB |
6730 | Changing to a smaller form is required if the specified size is smaller |
6731 | than that of the field's type and the type contains sub-fields that are | |
6732 | padded, in order to avoid generating accesses to these sub-fields that | |
6733 | are wider than the field. | |
a1ab4c31 AC |
6734 | |
6735 | We avoid the transformation if it is not required or potentially useful, | |
6736 | as it might entail an increase of the field's alignment and have ripple | |
6737 | effects on the outer record type. A typical case is a field known to be | |
d770e88d EB |
6738 | byte-aligned and not to share a byte with another field. */ |
6739 | if (!needs_strict_alignment | |
e1e5852c | 6740 | && RECORD_OR_UNION_TYPE_P (gnu_field_type) |
315cff15 | 6741 | && !TYPE_FAT_POINTER_P (gnu_field_type) |
cc269bb6 | 6742 | && tree_fits_uhwi_p (TYPE_SIZE (gnu_field_type)) |
a1ab4c31 AC |
6743 | && (packed == 1 |
6744 | || (gnu_size | |
6745 | && (tree_int_cst_lt (gnu_size, TYPE_SIZE (gnu_field_type)) | |
d770e88d EB |
6746 | || (Present (Component_Clause (gnat_field)) |
6747 | && !(UI_To_Int (Component_Bit_Offset (gnat_field)) | |
6748 | % BITS_PER_UNIT == 0 | |
6749 | && value_factor_p (gnu_size, BITS_PER_UNIT))))))) | |
a1ab4c31 | 6750 | { |
a1ab4c31 | 6751 | tree gnu_packable_type = make_packable_type (gnu_field_type, true); |
d770e88d | 6752 | if (gnu_packable_type != gnu_field_type) |
a1ab4c31 AC |
6753 | { |
6754 | gnu_field_type = gnu_packable_type; | |
a1ab4c31 AC |
6755 | if (!gnu_size) |
6756 | gnu_size = rm_size (gnu_field_type); | |
6757 | } | |
6758 | } | |
6759 | ||
f797c2b7 | 6760 | if (Is_Atomic_Or_VFA (gnat_field)) |
86a8ba5b | 6761 | check_ok_for_atomic_type (gnu_field_type, gnat_field, false); |
a1ab4c31 AC |
6762 | |
6763 | if (Present (Component_Clause (gnat_field))) | |
6764 | { | |
35786aad | 6765 | Node_Id gnat_clause = Component_Clause (gnat_field); |
ec88784d AC |
6766 | Entity_Id gnat_parent |
6767 | = Parent_Subtype (Underlying_Type (Scope (gnat_field))); | |
6768 | ||
a1ab4c31 AC |
6769 | gnu_pos = UI_To_gnu (Component_Bit_Offset (gnat_field), bitsizetype); |
6770 | gnu_size = validate_size (Esize (gnat_field), gnu_field_type, | |
6771 | gnat_field, FIELD_DECL, false, true); | |
6772 | ||
ec88784d AC |
6773 | /* Ensure the position does not overlap with the parent subtype, if there |
6774 | is one. This test is omitted if the parent of the tagged type has a | |
6775 | full rep clause since, in this case, component clauses are allowed to | |
6776 | overlay the space allocated for the parent type and the front-end has | |
6777 | checked that there are no overlapping components. */ | |
6778 | if (Present (gnat_parent) && !Is_Fully_Repped_Tagged_Type (gnat_parent)) | |
a1ab4c31 | 6779 | { |
ec88784d | 6780 | tree gnu_parent = gnat_to_gnu_type (gnat_parent); |
a1ab4c31 AC |
6781 | |
6782 | if (TREE_CODE (TYPE_SIZE (gnu_parent)) == INTEGER_CST | |
6783 | && tree_int_cst_lt (gnu_pos, TYPE_SIZE (gnu_parent))) | |
35786aad EB |
6784 | post_error_ne_tree |
6785 | ("offset of& must be beyond parent{, minimum allowed is ^}", | |
6786 | Position (gnat_clause), gnat_field, TYPE_SIZE_UNIT (gnu_parent)); | |
a1ab4c31 AC |
6787 | } |
6788 | ||
35786aad EB |
6789 | /* If this field needs strict alignment, make sure that the record is |
6790 | sufficiently aligned and that the position and size are consistent | |
6791 | with the type. But don't do it if we are just annotating types and | |
bd95368b OH |
6792 | the field's type is tagged, since tagged types aren't fully laid out |
6793 | in this mode. Also, note that atomic implies volatile so the inner | |
6794 | test sequences ordering is significant here. */ | |
b38086f0 EB |
6795 | if (needs_strict_alignment |
6796 | && !(type_annotate_only && Is_Tagged_Type (gnat_field_type))) | |
a1ab4c31 | 6797 | { |
35786aad EB |
6798 | const unsigned int type_align = TYPE_ALIGN (gnu_field_type); |
6799 | ||
6800 | if (TYPE_ALIGN (gnu_record_type) < type_align) | |
fe37c7af | 6801 | SET_TYPE_ALIGN (gnu_record_type, type_align); |
a1ab4c31 | 6802 | |
35786aad EB |
6803 | /* If the position is not a multiple of the alignment of the type, |
6804 | then error out and reset the position. */ | |
6805 | if (!integer_zerop (size_binop (TRUNC_MOD_EXPR, gnu_pos, | |
6806 | bitsize_int (type_align)))) | |
a1ab4c31 | 6807 | { |
35786aad | 6808 | const char *s; |
a1ab4c31 | 6809 | |
35786aad EB |
6810 | if (is_atomic) |
6811 | s = "position of atomic field& must be multiple of ^ bits"; | |
6812 | else if (is_aliased) | |
6813 | s = "position of aliased field& must be multiple of ^ bits"; | |
07aff4e3 AC |
6814 | else if (is_independent) |
6815 | s = "position of independent field& must be multiple of ^ bits"; | |
bd95368b | 6816 | else if (is_volatile) |
35786aad | 6817 | s = "position of volatile field& must be multiple of ^ bits"; |
c020c92b | 6818 | else if (Strict_Alignment (gnat_field_type)) |
35786aad EB |
6819 | s = "position of & with aliased or tagged part must be" |
6820 | " multiple of ^ bits"; | |
6821 | else | |
bd95368b OH |
6822 | gcc_unreachable (); |
6823 | ||
35786aad EB |
6824 | post_error_ne_num (s, First_Bit (gnat_clause), gnat_field, |
6825 | type_align); | |
6826 | gnu_pos = NULL_TREE; | |
a1ab4c31 AC |
6827 | } |
6828 | ||
35786aad | 6829 | if (gnu_size) |
a1ab4c31 | 6830 | { |
35786aad EB |
6831 | tree gnu_type_size = TYPE_SIZE (gnu_field_type); |
6832 | const int cmp = tree_int_cst_compare (gnu_size, gnu_type_size); | |
a1ab4c31 | 6833 | |
35786aad EB |
6834 | /* If the size is lower than that of the type, or greater for |
6835 | atomic and aliased, then error out and reset the size. */ | |
6836 | if (cmp < 0 || (cmp > 0 && (is_atomic || is_aliased))) | |
6837 | { | |
6838 | const char *s; | |
6839 | ||
6840 | if (is_atomic) | |
6841 | s = "size of atomic field& must be ^ bits"; | |
6842 | else if (is_aliased) | |
6843 | s = "size of aliased field& must be ^ bits"; | |
07aff4e3 AC |
6844 | else if (is_independent) |
6845 | s = "size of independent field& must be at least ^ bits"; | |
35786aad EB |
6846 | else if (is_volatile) |
6847 | s = "size of volatile field& must be at least ^ bits"; | |
6848 | else if (Strict_Alignment (gnat_field_type)) | |
6849 | s = "size of & with aliased or tagged part must be" | |
6850 | " at least ^ bits"; | |
6851 | else | |
6852 | gcc_unreachable (); | |
a1ab4c31 | 6853 | |
35786aad EB |
6854 | post_error_ne_tree (s, Last_Bit (gnat_clause), gnat_field, |
6855 | gnu_type_size); | |
6856 | gnu_size = NULL_TREE; | |
6857 | } | |
a1ab4c31 | 6858 | |
35786aad EB |
6859 | /* Likewise if the size is not a multiple of a byte, */ |
6860 | else if (!integer_zerop (size_binop (TRUNC_MOD_EXPR, gnu_size, | |
6861 | bitsize_unit_node))) | |
6862 | { | |
6863 | const char *s; | |
6864 | ||
07aff4e3 AC |
6865 | if (is_independent) |
6866 | s = "size of independent field& must be multiple of" | |
6867 | " Storage_Unit"; | |
6868 | else if (is_volatile) | |
35786aad EB |
6869 | s = "size of volatile field& must be multiple of" |
6870 | " Storage_Unit"; | |
6871 | else if (Strict_Alignment (gnat_field_type)) | |
6872 | s = "size of & with aliased or tagged part must be" | |
6873 | " multiple of Storage_Unit"; | |
6874 | else | |
6875 | gcc_unreachable (); | |
6876 | ||
6877 | post_error_ne (s, Last_Bit (gnat_clause), gnat_field); | |
6878 | gnu_size = NULL_TREE; | |
6879 | } | |
a1ab4c31 AC |
6880 | } |
6881 | } | |
a1ab4c31 AC |
6882 | } |
6883 | ||
6884 | /* If the record has rep clauses and this is the tag field, make a rep | |
6885 | clause for it as well. */ | |
6886 | else if (Has_Specified_Layout (Scope (gnat_field)) | |
6887 | && Chars (gnat_field) == Name_uTag) | |
6888 | { | |
6889 | gnu_pos = bitsize_zero_node; | |
6890 | gnu_size = TYPE_SIZE (gnu_field_type); | |
6891 | } | |
6892 | ||
6893 | else | |
0025cb63 EB |
6894 | { |
6895 | gnu_pos = NULL_TREE; | |
6896 | ||
6897 | /* If we are packing the record and the field is BLKmode, round the | |
6898 | size up to a byte boundary. */ | |
6899 | if (packed && TYPE_MODE (gnu_field_type) == BLKmode && gnu_size) | |
6900 | gnu_size = round_up (gnu_size, BITS_PER_UNIT); | |
6901 | } | |
a1ab4c31 AC |
6902 | |
6903 | /* We need to make the size the maximum for the type if it is | |
6904 | self-referential and an unconstrained type. In that case, we can't | |
6905 | pack the field since we can't make a copy to align it. */ | |
6906 | if (TREE_CODE (gnu_field_type) == RECORD_TYPE | |
6907 | && !gnu_size | |
6908 | && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_field_type)) | |
c020c92b | 6909 | && !Is_Constrained (Underlying_Type (gnat_field_type))) |
a1ab4c31 AC |
6910 | { |
6911 | gnu_size = max_size (TYPE_SIZE (gnu_field_type), true); | |
6912 | packed = 0; | |
6913 | } | |
6914 | ||
6915 | /* If a size is specified, adjust the field's type to it. */ | |
6916 | if (gnu_size) | |
6917 | { | |
839f2864 EB |
6918 | tree orig_field_type; |
6919 | ||
a1ab4c31 AC |
6920 | /* If the field's type is justified modular, we would need to remove |
6921 | the wrapper to (better) meet the layout requirements. However we | |
6922 | can do so only if the field is not aliased to preserve the unique | |
6923 | layout and if the prescribed size is not greater than that of the | |
6924 | packed array to preserve the justification. */ | |
6925 | if (!needs_strict_alignment | |
6926 | && TREE_CODE (gnu_field_type) == RECORD_TYPE | |
6927 | && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type) | |
6928 | && tree_int_cst_compare (gnu_size, TYPE_ADA_SIZE (gnu_field_type)) | |
6929 | <= 0) | |
6930 | gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type)); | |
6931 | ||
afb0fadf EB |
6932 | /* Similarly if the field's type is a misaligned integral type, but |
6933 | there is no restriction on the size as there is no justification. */ | |
6934 | if (!needs_strict_alignment | |
6935 | && TYPE_IS_PADDING_P (gnu_field_type) | |
6936 | && INTEGRAL_TYPE_P (TREE_TYPE (TYPE_FIELDS (gnu_field_type)))) | |
6937 | gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type)); | |
6938 | ||
a1ab4c31 AC |
6939 | gnu_field_type |
6940 | = make_type_from_size (gnu_field_type, gnu_size, | |
6941 | Has_Biased_Representation (gnat_field)); | |
839f2864 EB |
6942 | |
6943 | orig_field_type = gnu_field_type; | |
a1ab4c31 | 6944 | gnu_field_type = maybe_pad_type (gnu_field_type, gnu_size, 0, gnat_field, |
afb4afcd | 6945 | false, false, definition, true); |
839f2864 EB |
6946 | |
6947 | /* If a padding record was made, declare it now since it will never be | |
6948 | declared otherwise. This is necessary to ensure that its subtrees | |
6949 | are properly marked. */ | |
6950 | if (gnu_field_type != orig_field_type | |
6951 | && !DECL_P (TYPE_NAME (gnu_field_type))) | |
74746d49 EB |
6952 | create_type_decl (TYPE_NAME (gnu_field_type), gnu_field_type, true, |
6953 | debug_info_p, gnat_field); | |
a1ab4c31 AC |
6954 | } |
6955 | ||
6956 | /* Otherwise (or if there was an error), don't specify a position. */ | |
6957 | else | |
6958 | gnu_pos = NULL_TREE; | |
6959 | ||
ee45a32d EB |
6960 | /* If the field's type is a padded type made for a scalar field of a record |
6961 | type with reverse storage order, we need to propagate the reverse storage | |
6962 | order to the padding type since it is the innermost enclosing aggregate | |
6963 | type around the scalar. */ | |
6964 | if (TYPE_IS_PADDING_P (gnu_field_type) | |
6965 | && TYPE_REVERSE_STORAGE_ORDER (gnu_record_type) | |
6966 | && Is_Scalar_Type (gnat_field_type)) | |
6967 | gnu_field_type = set_reverse_storage_order_on_pad_type (gnu_field_type); | |
6968 | ||
a1ab4c31 AC |
6969 | gcc_assert (TREE_CODE (gnu_field_type) != RECORD_TYPE |
6970 | || !TYPE_CONTAINS_TEMPLATE_P (gnu_field_type)); | |
6971 | ||
6972 | /* Now create the decl for the field. */ | |
da01bfee EB |
6973 | gnu_field |
6974 | = create_field_decl (gnu_field_id, gnu_field_type, gnu_record_type, | |
6975 | gnu_size, gnu_pos, packed, Is_Aliased (gnat_field)); | |
a1ab4c31 | 6976 | Sloc_to_locus (Sloc (gnat_field), &DECL_SOURCE_LOCATION (gnu_field)); |
5f2e59d4 | 6977 | DECL_ALIASED_P (gnu_field) = Is_Aliased (gnat_field); |
2056c5ed | 6978 | TREE_SIDE_EFFECTS (gnu_field) = TREE_THIS_VOLATILE (gnu_field) = is_volatile; |
a1ab4c31 AC |
6979 | |
6980 | if (Ekind (gnat_field) == E_Discriminant) | |
64235766 EB |
6981 | { |
6982 | DECL_INVARIANT_P (gnu_field) | |
6983 | = No (Discriminant_Default_Value (gnat_field)); | |
6984 | DECL_DISCRIMINANT_NUMBER (gnu_field) | |
6985 | = UI_To_gnu (Discriminant_Number (gnat_field), sizetype); | |
6986 | } | |
a1ab4c31 AC |
6987 | |
6988 | return gnu_field; | |
6989 | } | |
6990 | \f | |
29e100b3 EB |
6991 | /* Return true if at least one member of COMPONENT_LIST needs strict |
6992 | alignment. */ | |
6993 | ||
6994 | static bool | |
6995 | components_need_strict_alignment (Node_Id component_list) | |
6996 | { | |
6997 | Node_Id component_decl; | |
6998 | ||
6999 | for (component_decl = First_Non_Pragma (Component_Items (component_list)); | |
7000 | Present (component_decl); | |
7001 | component_decl = Next_Non_Pragma (component_decl)) | |
7002 | { | |
7003 | Entity_Id gnat_field = Defining_Entity (component_decl); | |
7004 | ||
7005 | if (Is_Aliased (gnat_field)) | |
78df6221 | 7006 | return true; |
29e100b3 EB |
7007 | |
7008 | if (Strict_Alignment (Etype (gnat_field))) | |
78df6221 | 7009 | return true; |
29e100b3 EB |
7010 | } |
7011 | ||
78df6221 | 7012 | return false; |
29e100b3 EB |
7013 | } |
7014 | ||
f45ccc7c AC |
7015 | /* Return true if TYPE is a type with variable size or a padding type with a |
7016 | field of variable size or a record that has a field with such a type. */ | |
a1ab4c31 AC |
7017 | |
7018 | static bool | |
5f2e59d4 | 7019 | type_has_variable_size (tree type) |
a1ab4c31 AC |
7020 | { |
7021 | tree field; | |
7022 | ||
7023 | if (!TREE_CONSTANT (TYPE_SIZE (type))) | |
7024 | return true; | |
7025 | ||
315cff15 | 7026 | if (TYPE_IS_PADDING_P (type) |
a1ab4c31 AC |
7027 | && !TREE_CONSTANT (DECL_SIZE (TYPE_FIELDS (type)))) |
7028 | return true; | |
7029 | ||
e1e5852c | 7030 | if (!RECORD_OR_UNION_TYPE_P (type)) |
a1ab4c31 AC |
7031 | return false; |
7032 | ||
910ad8de | 7033 | for (field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field)) |
5f2e59d4 | 7034 | if (type_has_variable_size (TREE_TYPE (field))) |
a1ab4c31 AC |
7035 | return true; |
7036 | ||
7037 | return false; | |
7038 | } | |
7039 | \f | |
5f2e59d4 EB |
7040 | /* Return true if FIELD is an artificial field. */ |
7041 | ||
7042 | static bool | |
7043 | field_is_artificial (tree field) | |
7044 | { | |
7045 | /* These fields are generated by the front-end proper. */ | |
7046 | if (IDENTIFIER_POINTER (DECL_NAME (field)) [0] == '_') | |
7047 | return true; | |
7048 | ||
7049 | /* These fields are generated by gigi. */ | |
7050 | if (DECL_INTERNAL_P (field)) | |
7051 | return true; | |
7052 | ||
7053 | return false; | |
7054 | } | |
7055 | ||
7056 | /* Return true if FIELD is a non-artificial aliased field. */ | |
7057 | ||
7058 | static bool | |
7059 | field_is_aliased (tree field) | |
7060 | { | |
7061 | if (field_is_artificial (field)) | |
7062 | return false; | |
7063 | ||
7064 | return DECL_ALIASED_P (field); | |
7065 | } | |
7066 | ||
7067 | /* Return true if FIELD is a non-artificial field with self-referential | |
7068 | size. */ | |
7069 | ||
7070 | static bool | |
7071 | field_has_self_size (tree field) | |
7072 | { | |
7073 | if (field_is_artificial (field)) | |
7074 | return false; | |
7075 | ||
7076 | if (DECL_SIZE (field) && TREE_CODE (DECL_SIZE (field)) == INTEGER_CST) | |
7077 | return false; | |
7078 | ||
7079 | return CONTAINS_PLACEHOLDER_P (TYPE_SIZE (TREE_TYPE (field))); | |
7080 | } | |
7081 | ||
7082 | /* Return true if FIELD is a non-artificial field with variable size. */ | |
7083 | ||
7084 | static bool | |
7085 | field_has_variable_size (tree field) | |
7086 | { | |
7087 | if (field_is_artificial (field)) | |
7088 | return false; | |
7089 | ||
7090 | if (DECL_SIZE (field) && TREE_CODE (DECL_SIZE (field)) == INTEGER_CST) | |
7091 | return false; | |
7092 | ||
7093 | return TREE_CODE (TYPE_SIZE (TREE_TYPE (field))) != INTEGER_CST; | |
7094 | } | |
7095 | ||
a1ab4c31 AC |
7096 | /* qsort comparer for the bit positions of two record components. */ |
7097 | ||
7098 | static int | |
7099 | compare_field_bitpos (const PTR rt1, const PTR rt2) | |
7100 | { | |
7101 | const_tree const field1 = * (const_tree const *) rt1; | |
7102 | const_tree const field2 = * (const_tree const *) rt2; | |
7103 | const int ret | |
7104 | = tree_int_cst_compare (bit_position (field1), bit_position (field2)); | |
7105 | ||
7106 | return ret ? ret : (int) (DECL_UID (field1) - DECL_UID (field2)); | |
7107 | } | |
7108 | ||
9580628d EB |
7109 | /* Structure holding information for a given variant. */ |
7110 | typedef struct vinfo | |
7111 | { | |
7112 | /* The record type of the variant. */ | |
7113 | tree type; | |
7114 | ||
7115 | /* The name of the variant. */ | |
7116 | tree name; | |
7117 | ||
7118 | /* The qualifier of the variant. */ | |
7119 | tree qual; | |
7120 | ||
7121 | /* Whether the variant has a rep clause. */ | |
7122 | bool has_rep; | |
7123 | ||
7124 | /* Whether the variant is packed. */ | |
7125 | bool packed; | |
7126 | ||
7127 | } vinfo_t; | |
7128 | ||
7129 | /* Translate and chain the GNAT_COMPONENT_LIST to the GNU_FIELD_LIST, set the | |
7130 | result as the field list of GNU_RECORD_TYPE and finish it up. Return true | |
7131 | if GNU_RECORD_TYPE has a rep clause which affects the layout (see below). | |
7132 | When called from gnat_to_gnu_entity during the processing of a record type | |
a6a29d0c EB |
7133 | definition, the GCC node for the parent, if any, will be the single field |
7134 | of GNU_RECORD_TYPE and the GCC nodes for the discriminants will be on the | |
7135 | GNU_FIELD_LIST. The other calls to this function are recursive calls for | |
7136 | the component list of a variant and, in this case, GNU_FIELD_LIST is empty. | |
a1ab4c31 | 7137 | |
14ecca2e EB |
7138 | PACKED is 1 if this is for a packed record or -1 if this is for a record |
7139 | with Component_Alignment of Storage_Unit. | |
a1ab4c31 | 7140 | |
032d1b71 | 7141 | DEFINITION is true if we are defining this record type. |
a1ab4c31 | 7142 | |
032d1b71 EB |
7143 | CANCEL_ALIGNMENT is true if the alignment should be zeroed before laying |
7144 | out the record. This means the alignment only serves to force fields to | |
7145 | be bitfields, but not to require the record to be that aligned. This is | |
7146 | used for variants. | |
7147 | ||
7148 | ALL_REP is true if a rep clause is present for all the fields. | |
a1ab4c31 | 7149 | |
032d1b71 EB |
7150 | UNCHECKED_UNION is true if we are building this type for a record with a |
7151 | Pragma Unchecked_Union. | |
a1ab4c31 | 7152 | |
fd787640 EB |
7153 | ARTIFICIAL is true if this is a type that was generated by the compiler. |
7154 | ||
ef0feeb2 | 7155 | DEBUG_INFO is true if we need to write debug information about the type. |
a1ab4c31 | 7156 | |
032d1b71 | 7157 | MAYBE_UNUSED is true if this type may be unused in the end; this doesn't |
ef0feeb2 | 7158 | mean that its contents may be unused as well, only the container itself. |
839f2864 | 7159 | |
ef0feeb2 EB |
7160 | REORDER is true if we are permitted to reorder components of this type. |
7161 | ||
b1a785fb EB |
7162 | FIRST_FREE_POS, if nonzero, is the first (lowest) free field position in |
7163 | the outer record type down to this variant level. It is nonzero only if | |
7164 | all the fields down to this level have a rep clause and ALL_REP is false. | |
7165 | ||
ef0feeb2 EB |
7166 | P_GNU_REP_LIST, if nonzero, is a pointer to a list to which each field |
7167 | with a rep clause is to be added; in this case, that is all that should | |
9580628d | 7168 | be done with such fields and the return value will be false. */ |
a1ab4c31 | 7169 | |
9580628d | 7170 | static bool |
8cd28148 | 7171 | components_to_record (tree gnu_record_type, Node_Id gnat_component_list, |
a1ab4c31 | 7172 | tree gnu_field_list, int packed, bool definition, |
ef0feeb2 | 7173 | bool cancel_alignment, bool all_rep, |
fd787640 EB |
7174 | bool unchecked_union, bool artificial, |
7175 | bool debug_info, bool maybe_unused, bool reorder, | |
b1a785fb | 7176 | tree first_free_pos, tree *p_gnu_rep_list) |
a1ab4c31 | 7177 | { |
986ccd21 PMR |
7178 | const bool needs_xv_encodings |
7179 | = debug_info && gnat_encodings != DWARF_GNAT_ENCODINGS_MINIMAL; | |
a1ab4c31 | 7180 | bool all_rep_and_size = all_rep && TYPE_SIZE (gnu_record_type); |
9580628d | 7181 | bool variants_have_rep = all_rep; |
8cd28148 | 7182 | bool layout_with_rep = false; |
5f2e59d4 EB |
7183 | bool has_self_field = false; |
7184 | bool has_aliased_after_self_field = false; | |
8cd28148 | 7185 | Node_Id component_decl, variant_part; |
ef0feeb2 EB |
7186 | tree gnu_field, gnu_next, gnu_last; |
7187 | tree gnu_variant_part = NULL_TREE; | |
7188 | tree gnu_rep_list = NULL_TREE; | |
7189 | tree gnu_var_list = NULL_TREE; | |
7190 | tree gnu_self_list = NULL_TREE; | |
6bc8df24 | 7191 | tree gnu_zero_list = NULL_TREE; |
a1ab4c31 | 7192 | |
8cd28148 EB |
7193 | /* For each component referenced in a component declaration create a GCC |
7194 | field and add it to the list, skipping pragmas in the GNAT list. */ | |
ef0feeb2 | 7195 | gnu_last = tree_last (gnu_field_list); |
8cd28148 EB |
7196 | if (Present (Component_Items (gnat_component_list))) |
7197 | for (component_decl | |
7198 | = First_Non_Pragma (Component_Items (gnat_component_list)); | |
a1ab4c31 AC |
7199 | Present (component_decl); |
7200 | component_decl = Next_Non_Pragma (component_decl)) | |
7201 | { | |
8cd28148 | 7202 | Entity_Id gnat_field = Defining_Entity (component_decl); |
a6a29d0c | 7203 | Name_Id gnat_name = Chars (gnat_field); |
a1ab4c31 | 7204 | |
a6a29d0c EB |
7205 | /* If present, the _Parent field must have been created as the single |
7206 | field of the record type. Put it before any other fields. */ | |
7207 | if (gnat_name == Name_uParent) | |
7208 | { | |
7209 | gnu_field = TYPE_FIELDS (gnu_record_type); | |
7210 | gnu_field_list = chainon (gnu_field_list, gnu_field); | |
7211 | } | |
a1ab4c31 AC |
7212 | else |
7213 | { | |
839f2864 | 7214 | gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type, packed, |
ef0feeb2 | 7215 | definition, debug_info); |
a1ab4c31 | 7216 | |
a6a29d0c EB |
7217 | /* If this is the _Tag field, put it before any other fields. */ |
7218 | if (gnat_name == Name_uTag) | |
a1ab4c31 | 7219 | gnu_field_list = chainon (gnu_field_list, gnu_field); |
a6a29d0c EB |
7220 | |
7221 | /* If this is the _Controller field, put it before the other | |
7222 | fields except for the _Tag or _Parent field. */ | |
7223 | else if (gnat_name == Name_uController && gnu_last) | |
7224 | { | |
910ad8de NF |
7225 | DECL_CHAIN (gnu_field) = DECL_CHAIN (gnu_last); |
7226 | DECL_CHAIN (gnu_last) = gnu_field; | |
a6a29d0c EB |
7227 | } |
7228 | ||
7229 | /* If this is a regular field, put it after the other fields. */ | |
a1ab4c31 AC |
7230 | else |
7231 | { | |
910ad8de | 7232 | DECL_CHAIN (gnu_field) = gnu_field_list; |
a1ab4c31 | 7233 | gnu_field_list = gnu_field; |
a6a29d0c EB |
7234 | if (!gnu_last) |
7235 | gnu_last = gnu_field; | |
5f2e59d4 EB |
7236 | |
7237 | /* And record information for the final layout. */ | |
7238 | if (field_has_self_size (gnu_field)) | |
7239 | has_self_field = true; | |
7240 | else if (has_self_field && field_is_aliased (gnu_field)) | |
7241 | has_aliased_after_self_field = true; | |
a1ab4c31 AC |
7242 | } |
7243 | } | |
7244 | ||
2ddc34ba | 7245 | save_gnu_tree (gnat_field, gnu_field, false); |
a1ab4c31 AC |
7246 | } |
7247 | ||
7248 | /* At the end of the component list there may be a variant part. */ | |
8cd28148 | 7249 | variant_part = Variant_Part (gnat_component_list); |
a1ab4c31 AC |
7250 | |
7251 | /* We create a QUAL_UNION_TYPE for the variant part since the variants are | |
7252 | mutually exclusive and should go in the same memory. To do this we need | |
7253 | to treat each variant as a record whose elements are created from the | |
7254 | component list for the variant. So here we create the records from the | |
7255 | lists for the variants and put them all into the QUAL_UNION_TYPE. | |
7256 | If this is an Unchecked_Union, we make a UNION_TYPE instead or | |
7257 | use GNU_RECORD_TYPE if there are no fields so far. */ | |
7258 | if (Present (variant_part)) | |
7259 | { | |
0fb2335d EB |
7260 | Node_Id gnat_discr = Name (variant_part), variant; |
7261 | tree gnu_discr = gnat_to_gnu (gnat_discr); | |
9dba4b55 | 7262 | tree gnu_name = TYPE_IDENTIFIER (gnu_record_type); |
a1ab4c31 | 7263 | tree gnu_var_name |
0fb2335d EB |
7264 | = concat_name (get_identifier (Get_Name_String (Chars (gnat_discr))), |
7265 | "XVN"); | |
ef0feeb2 | 7266 | tree gnu_union_type, gnu_union_name; |
b1a785fb | 7267 | tree this_first_free_pos, gnu_variant_list = NULL_TREE; |
29e100b3 | 7268 | bool union_field_needs_strict_alignment = false; |
00f96dc9 | 7269 | auto_vec <vinfo_t, 16> variant_types; |
9580628d EB |
7270 | vinfo_t *gnu_variant; |
7271 | unsigned int variants_align = 0; | |
7272 | unsigned int i; | |
7273 | ||
0fb2335d EB |
7274 | gnu_union_name |
7275 | = concat_name (gnu_name, IDENTIFIER_POINTER (gnu_var_name)); | |
a1ab4c31 | 7276 | |
b1a785fb EB |
7277 | /* Reuse the enclosing union if this is an Unchecked_Union whose fields |
7278 | are all in the variant part, to match the layout of C unions. There | |
7279 | is an associated check below. */ | |
7280 | if (TREE_CODE (gnu_record_type) == UNION_TYPE) | |
a1ab4c31 AC |
7281 | gnu_union_type = gnu_record_type; |
7282 | else | |
7283 | { | |
7284 | gnu_union_type | |
7285 | = make_node (unchecked_union ? UNION_TYPE : QUAL_UNION_TYPE); | |
7286 | ||
7287 | TYPE_NAME (gnu_union_type) = gnu_union_name; | |
fe37c7af | 7288 | SET_TYPE_ALIGN (gnu_union_type, 0); |
a1ab4c31 | 7289 | TYPE_PACKED (gnu_union_type) = TYPE_PACKED (gnu_record_type); |
ee45a32d EB |
7290 | TYPE_REVERSE_STORAGE_ORDER (gnu_union_type) |
7291 | = TYPE_REVERSE_STORAGE_ORDER (gnu_record_type); | |
a1ab4c31 AC |
7292 | } |
7293 | ||
b1a785fb EB |
7294 | /* If all the fields down to this level have a rep clause, find out |
7295 | whether all the fields at this level also have one. If so, then | |
7296 | compute the new first free position to be passed downward. */ | |
7297 | this_first_free_pos = first_free_pos; | |
7298 | if (this_first_free_pos) | |
7299 | { | |
7300 | for (gnu_field = gnu_field_list; | |
7301 | gnu_field; | |
7302 | gnu_field = DECL_CHAIN (gnu_field)) | |
7303 | if (DECL_FIELD_OFFSET (gnu_field)) | |
7304 | { | |
7305 | tree pos = bit_position (gnu_field); | |
7306 | if (!tree_int_cst_lt (pos, this_first_free_pos)) | |
7307 | this_first_free_pos | |
7308 | = size_binop (PLUS_EXPR, pos, DECL_SIZE (gnu_field)); | |
7309 | } | |
7310 | else | |
7311 | { | |
7312 | this_first_free_pos = NULL_TREE; | |
7313 | break; | |
7314 | } | |
7315 | } | |
7316 | ||
9580628d EB |
7317 | /* We build the variants in two passes. The bulk of the work is done in |
7318 | the first pass, that is to say translating the GNAT nodes, building | |
7319 | the container types and computing the associated properties. However | |
7320 | we cannot finish up the container types during this pass because we | |
7321 | don't know where the variant part will be placed until the end. */ | |
a1ab4c31 AC |
7322 | for (variant = First_Non_Pragma (Variants (variant_part)); |
7323 | Present (variant); | |
7324 | variant = Next_Non_Pragma (variant)) | |
7325 | { | |
7326 | tree gnu_variant_type = make_node (RECORD_TYPE); | |
9580628d EB |
7327 | tree gnu_inner_name, gnu_qual; |
7328 | bool has_rep; | |
7329 | int field_packed; | |
7330 | vinfo_t vinfo; | |
a1ab4c31 AC |
7331 | |
7332 | Get_Variant_Encoding (variant); | |
0fb2335d | 7333 | gnu_inner_name = get_identifier_with_length (Name_Buffer, Name_Len); |
a1ab4c31 | 7334 | TYPE_NAME (gnu_variant_type) |
0fb2335d EB |
7335 | = concat_name (gnu_union_name, |
7336 | IDENTIFIER_POINTER (gnu_inner_name)); | |
a1ab4c31 AC |
7337 | |
7338 | /* Set the alignment of the inner type in case we need to make | |
8cd28148 EB |
7339 | inner objects into bitfields, but then clear it out so the |
7340 | record actually gets only the alignment required. */ | |
fe37c7af | 7341 | SET_TYPE_ALIGN (gnu_variant_type, TYPE_ALIGN (gnu_record_type)); |
a1ab4c31 | 7342 | TYPE_PACKED (gnu_variant_type) = TYPE_PACKED (gnu_record_type); |
ee45a32d EB |
7343 | TYPE_REVERSE_STORAGE_ORDER (gnu_variant_type) |
7344 | = TYPE_REVERSE_STORAGE_ORDER (gnu_record_type); | |
a1ab4c31 | 7345 | |
8cd28148 | 7346 | /* Similarly, if the outer record has a size specified and all |
b1a785fb | 7347 | the fields have a rep clause, we can propagate the size. */ |
a1ab4c31 AC |
7348 | if (all_rep_and_size) |
7349 | { | |
7350 | TYPE_SIZE (gnu_variant_type) = TYPE_SIZE (gnu_record_type); | |
7351 | TYPE_SIZE_UNIT (gnu_variant_type) | |
7352 | = TYPE_SIZE_UNIT (gnu_record_type); | |
7353 | } | |
7354 | ||
032d1b71 EB |
7355 | /* Add the fields into the record type for the variant. Note that |
7356 | we aren't sure to really use it at this point, see below. */ | |
9580628d EB |
7357 | has_rep |
7358 | = components_to_record (gnu_variant_type, Component_List (variant), | |
7359 | NULL_TREE, packed, definition, | |
7360 | !all_rep_and_size, all_rep, | |
7361 | unchecked_union, | |
986ccd21 | 7362 | true, needs_xv_encodings, true, reorder, |
9580628d EB |
7363 | this_first_free_pos, |
7364 | all_rep || this_first_free_pos | |
7365 | ? NULL : &gnu_rep_list); | |
7366 | ||
7367 | /* Translate the qualifier and annotate the GNAT node. */ | |
0fb2335d | 7368 | gnu_qual = choices_to_gnu (gnu_discr, Discrete_Choices (variant)); |
a1ab4c31 AC |
7369 | Set_Present_Expr (variant, annotate_value (gnu_qual)); |
7370 | ||
9580628d EB |
7371 | /* Deal with packedness like in gnat_to_gnu_field. */ |
7372 | if (components_need_strict_alignment (Component_List (variant))) | |
7373 | { | |
7374 | field_packed = 0; | |
7375 | union_field_needs_strict_alignment = true; | |
7376 | } | |
7377 | else | |
7378 | field_packed | |
7379 | = adjust_packed (gnu_variant_type, gnu_record_type, packed); | |
7380 | ||
7381 | /* Push this variant onto the stack for the second pass. */ | |
7382 | vinfo.type = gnu_variant_type; | |
7383 | vinfo.name = gnu_inner_name; | |
7384 | vinfo.qual = gnu_qual; | |
7385 | vinfo.has_rep = has_rep; | |
7386 | vinfo.packed = field_packed; | |
7387 | variant_types.safe_push (vinfo); | |
7388 | ||
7389 | /* Compute the global properties that will determine the placement of | |
7390 | the variant part. */ | |
7391 | variants_have_rep |= has_rep; | |
7392 | if (!field_packed && TYPE_ALIGN (gnu_variant_type) > variants_align) | |
7393 | variants_align = TYPE_ALIGN (gnu_variant_type); | |
7394 | } | |
7395 | ||
7396 | /* Round up the first free position to the alignment of the variant part | |
7397 | for the variants without rep clause. This will guarantee a consistent | |
7398 | layout independently of the placement of the variant part. */ | |
7399 | if (variants_have_rep && variants_align > 0 && this_first_free_pos) | |
7400 | this_first_free_pos = round_up (this_first_free_pos, variants_align); | |
7401 | ||
7402 | /* In the second pass, the container types are adjusted if necessary and | |
7403 | finished up, then the corresponding fields of the variant part are | |
7404 | built with their qualifier, unless this is an unchecked union. */ | |
7405 | FOR_EACH_VEC_ELT (variant_types, i, gnu_variant) | |
7406 | { | |
7407 | tree gnu_variant_type = gnu_variant->type; | |
7408 | tree gnu_field_list = TYPE_FIELDS (gnu_variant_type); | |
7409 | ||
b1a785fb EB |
7410 | /* If this is an Unchecked_Union whose fields are all in the variant |
7411 | part and we have a single field with no representation clause or | |
7412 | placed at offset zero, use the field directly to match the layout | |
7413 | of C unions. */ | |
7414 | if (TREE_CODE (gnu_record_type) == UNION_TYPE | |
9580628d EB |
7415 | && gnu_field_list |
7416 | && !DECL_CHAIN (gnu_field_list) | |
7417 | && (!DECL_FIELD_OFFSET (gnu_field_list) | |
7418 | || integer_zerop (bit_position (gnu_field_list)))) | |
7419 | { | |
7420 | gnu_field = gnu_field_list; | |
7421 | DECL_CONTEXT (gnu_field) = gnu_record_type; | |
7422 | } | |
a1ab4c31 AC |
7423 | else |
7424 | { | |
9580628d EB |
7425 | /* Finalize the variant type now. We used to throw away empty |
7426 | record types but we no longer do that because we need them to | |
7427 | generate complete debug info for the variant; otherwise, the | |
7428 | union type definition will be lacking the fields associated | |
7429 | with these empty variants. */ | |
7430 | if (gnu_field_list && variants_have_rep && !gnu_variant->has_rep) | |
29e100b3 | 7431 | { |
9580628d EB |
7432 | /* The variant part will be at offset 0 so we need to ensure |
7433 | that the fields are laid out starting from the first free | |
7434 | position at this level. */ | |
7435 | tree gnu_rep_type = make_node (RECORD_TYPE); | |
7436 | tree gnu_rep_part; | |
ee45a32d EB |
7437 | TYPE_REVERSE_STORAGE_ORDER (gnu_rep_type) |
7438 | = TYPE_REVERSE_STORAGE_ORDER (gnu_variant_type); | |
9580628d EB |
7439 | finish_record_type (gnu_rep_type, NULL_TREE, 0, debug_info); |
7440 | gnu_rep_part | |
7441 | = create_rep_part (gnu_rep_type, gnu_variant_type, | |
7442 | this_first_free_pos); | |
7443 | DECL_CHAIN (gnu_rep_part) = gnu_field_list; | |
7444 | gnu_field_list = gnu_rep_part; | |
7445 | finish_record_type (gnu_variant_type, gnu_field_list, 0, | |
7446 | false); | |
29e100b3 | 7447 | } |
9580628d EB |
7448 | |
7449 | if (debug_info) | |
7450 | rest_of_record_type_compilation (gnu_variant_type); | |
95c1c4bb | 7451 | create_type_decl (TYPE_NAME (gnu_variant_type), gnu_variant_type, |
986ccd21 | 7452 | true, needs_xv_encodings, gnat_component_list); |
a1ab4c31 | 7453 | |
da01bfee | 7454 | gnu_field |
9580628d | 7455 | = create_field_decl (gnu_variant->name, gnu_variant_type, |
da01bfee EB |
7456 | gnu_union_type, |
7457 | all_rep_and_size | |
7458 | ? TYPE_SIZE (gnu_variant_type) : 0, | |
9580628d EB |
7459 | variants_have_rep ? bitsize_zero_node : 0, |
7460 | gnu_variant->packed, 0); | |
a1ab4c31 AC |
7461 | |
7462 | DECL_INTERNAL_P (gnu_field) = 1; | |
7463 | ||
7464 | if (!unchecked_union) | |
9580628d | 7465 | DECL_QUALIFIER (gnu_field) = gnu_variant->qual; |
a1ab4c31 AC |
7466 | } |
7467 | ||
910ad8de | 7468 | DECL_CHAIN (gnu_field) = gnu_variant_list; |
a1ab4c31 AC |
7469 | gnu_variant_list = gnu_field; |
7470 | } | |
7471 | ||
8cd28148 | 7472 | /* Only make the QUAL_UNION_TYPE if there are non-empty variants. */ |
a1ab4c31 AC |
7473 | if (gnu_variant_list) |
7474 | { | |
7475 | int union_field_packed; | |
7476 | ||
7477 | if (all_rep_and_size) | |
7478 | { | |
7479 | TYPE_SIZE (gnu_union_type) = TYPE_SIZE (gnu_record_type); | |
7480 | TYPE_SIZE_UNIT (gnu_union_type) | |
7481 | = TYPE_SIZE_UNIT (gnu_record_type); | |
7482 | } | |
7483 | ||
7484 | finish_record_type (gnu_union_type, nreverse (gnu_variant_list), | |
986ccd21 | 7485 | all_rep_and_size ? 1 : 0, needs_xv_encodings); |
a1ab4c31 AC |
7486 | |
7487 | /* If GNU_UNION_TYPE is our record type, it means we must have an | |
7488 | Unchecked_Union with no fields. Verify that and, if so, just | |
7489 | return. */ | |
7490 | if (gnu_union_type == gnu_record_type) | |
7491 | { | |
7492 | gcc_assert (unchecked_union | |
7493 | && !gnu_field_list | |
ef0feeb2 | 7494 | && !gnu_rep_list); |
9580628d | 7495 | return variants_have_rep; |
a1ab4c31 AC |
7496 | } |
7497 | ||
74746d49 | 7498 | create_type_decl (TYPE_NAME (gnu_union_type), gnu_union_type, true, |
986ccd21 | 7499 | needs_xv_encodings, gnat_component_list); |
95c1c4bb | 7500 | |
a1ab4c31 | 7501 | /* Deal with packedness like in gnat_to_gnu_field. */ |
29e100b3 EB |
7502 | if (union_field_needs_strict_alignment) |
7503 | union_field_packed = 0; | |
7504 | else | |
7505 | union_field_packed | |
7506 | = adjust_packed (gnu_union_type, gnu_record_type, packed); | |
a1ab4c31 | 7507 | |
ef0feeb2 | 7508 | gnu_variant_part |
a1ab4c31 | 7509 | = create_field_decl (gnu_var_name, gnu_union_type, gnu_record_type, |
29e100b3 EB |
7510 | all_rep_and_size |
7511 | ? TYPE_SIZE (gnu_union_type) : 0, | |
9580628d | 7512 | variants_have_rep ? bitsize_zero_node : 0, |
da01bfee | 7513 | union_field_packed, 0); |
a1ab4c31 | 7514 | |
ef0feeb2 | 7515 | DECL_INTERNAL_P (gnu_variant_part) = 1; |
a1ab4c31 AC |
7516 | } |
7517 | } | |
7518 | ||
ef0feeb2 EB |
7519 | /* Scan GNU_FIELD_LIST and see if any fields have rep clauses and, if we are |
7520 | permitted to reorder components, self-referential sizes or variable sizes. | |
7521 | If they do, pull them out and put them onto the appropriate list. We have | |
7522 | to do this in a separate pass since we want to handle the discriminants | |
7523 | but can't play with them until we've used them in debugging data above. | |
8cd28148 | 7524 | |
6bc8df24 EB |
7525 | Similarly, pull out the fields with zero size and no rep clause, as they |
7526 | would otherwise modify the layout and thus very likely run afoul of the | |
7527 | Ada semantics, which are different from those of C here. | |
7528 | ||
ef0feeb2 EB |
7529 | ??? If we reorder them, debugging information will be wrong but there is |
7530 | nothing that can be done about this at the moment. */ | |
8cd28148 | 7531 | gnu_last = NULL_TREE; |
ef0feeb2 EB |
7532 | |
7533 | #define MOVE_FROM_FIELD_LIST_TO(LIST) \ | |
7534 | do { \ | |
7535 | if (gnu_last) \ | |
7536 | DECL_CHAIN (gnu_last) = gnu_next; \ | |
7537 | else \ | |
7538 | gnu_field_list = gnu_next; \ | |
7539 | \ | |
7540 | DECL_CHAIN (gnu_field) = (LIST); \ | |
7541 | (LIST) = gnu_field; \ | |
7542 | } while (0) | |
7543 | ||
8cd28148 | 7544 | for (gnu_field = gnu_field_list; gnu_field; gnu_field = gnu_next) |
a1ab4c31 | 7545 | { |
910ad8de | 7546 | gnu_next = DECL_CHAIN (gnu_field); |
8cd28148 | 7547 | |
a1ab4c31 AC |
7548 | if (DECL_FIELD_OFFSET (gnu_field)) |
7549 | { | |
ef0feeb2 EB |
7550 | MOVE_FROM_FIELD_LIST_TO (gnu_rep_list); |
7551 | continue; | |
7552 | } | |
7553 | ||
5f2e59d4 EB |
7554 | if ((reorder || has_aliased_after_self_field) |
7555 | && field_has_self_size (gnu_field)) | |
ef0feeb2 | 7556 | { |
5f2e59d4 EB |
7557 | MOVE_FROM_FIELD_LIST_TO (gnu_self_list); |
7558 | continue; | |
7559 | } | |
a1ab4c31 | 7560 | |
5f2e59d4 EB |
7561 | if (reorder && field_has_variable_size (gnu_field)) |
7562 | { | |
7563 | MOVE_FROM_FIELD_LIST_TO (gnu_var_list); | |
7564 | continue; | |
a1ab4c31 | 7565 | } |
ef0feeb2 | 7566 | |
6bc8df24 EB |
7567 | if (DECL_SIZE (gnu_field) && integer_zerop (DECL_SIZE (gnu_field))) |
7568 | { | |
7569 | DECL_FIELD_OFFSET (gnu_field) = size_zero_node; | |
7570 | SET_DECL_OFFSET_ALIGN (gnu_field, BIGGEST_ALIGNMENT); | |
7571 | DECL_FIELD_BIT_OFFSET (gnu_field) = bitsize_zero_node; | |
7572 | if (field_is_aliased (gnu_field)) | |
fe37c7af MM |
7573 | SET_TYPE_ALIGN (gnu_record_type, |
7574 | MAX (TYPE_ALIGN (gnu_record_type), | |
7575 | TYPE_ALIGN (TREE_TYPE (gnu_field)))); | |
6bc8df24 EB |
7576 | MOVE_FROM_FIELD_LIST_TO (gnu_zero_list); |
7577 | continue; | |
7578 | } | |
7579 | ||
ef0feeb2 | 7580 | gnu_last = gnu_field; |
a1ab4c31 AC |
7581 | } |
7582 | ||
ef0feeb2 EB |
7583 | #undef MOVE_FROM_FIELD_LIST_TO |
7584 | ||
9580628d EB |
7585 | gnu_field_list = nreverse (gnu_field_list); |
7586 | ||
5f2e59d4 | 7587 | /* If permitted, we reorder the fields as follows: |
ef0feeb2 EB |
7588 | |
7589 | 1) all fixed length fields, | |
7590 | 2) all fields whose length doesn't depend on discriminants, | |
7591 | 3) all fields whose length depends on discriminants, | |
7592 | 4) the variant part, | |
7593 | ||
7594 | within the record and within each variant recursively. */ | |
7595 | if (reorder) | |
7596 | gnu_field_list | |
9580628d | 7597 | = chainon (gnu_field_list, chainon (gnu_var_list, gnu_self_list)); |
ef0feeb2 | 7598 | |
5f2e59d4 EB |
7599 | /* Otherwise, if there is an aliased field placed after a field whose length |
7600 | depends on discriminants, we put all the fields of the latter sort, last. | |
7601 | We need to do this in case an object of this record type is mutable. */ | |
7602 | else if (has_aliased_after_self_field) | |
9580628d | 7603 | gnu_field_list = chainon (gnu_field_list, gnu_self_list); |
5f2e59d4 | 7604 | |
b1a785fb EB |
7605 | /* If P_REP_LIST is nonzero, this means that we are asked to move the fields |
7606 | in our REP list to the previous level because this level needs them in | |
7607 | order to do a correct layout, i.e. avoid having overlapping fields. */ | |
7608 | if (p_gnu_rep_list && gnu_rep_list) | |
ef0feeb2 | 7609 | *p_gnu_rep_list = chainon (*p_gnu_rep_list, gnu_rep_list); |
8cd28148 | 7610 | |
7d9979e6 EB |
7611 | /* Deal with the annoying case of an extension of a record with variable size |
7612 | and partial rep clause, for which the _Parent field is forced at offset 0 | |
7613 | and has variable size, which we do not support below. Note that we cannot | |
7614 | do it if the field has fixed size because we rely on the presence of the | |
7615 | REP part built below to trigger the reordering of the fields in a derived | |
7616 | record type when all the fields have a fixed position. */ | |
a1799e5e EB |
7617 | else if (gnu_rep_list |
7618 | && !DECL_CHAIN (gnu_rep_list) | |
7d9979e6 | 7619 | && TREE_CODE (DECL_SIZE (gnu_rep_list)) != INTEGER_CST |
a1799e5e EB |
7620 | && !variants_have_rep |
7621 | && first_free_pos | |
7622 | && integer_zerop (first_free_pos) | |
7623 | && integer_zerop (bit_position (gnu_rep_list))) | |
7624 | { | |
7625 | DECL_CHAIN (gnu_rep_list) = gnu_field_list; | |
7626 | gnu_field_list = gnu_rep_list; | |
7627 | gnu_rep_list = NULL_TREE; | |
7628 | } | |
7629 | ||
8cd28148 | 7630 | /* Otherwise, sort the fields by bit position and put them into their own |
b1a785fb | 7631 | record, before the others, if we also have fields without rep clause. */ |
ef0feeb2 | 7632 | else if (gnu_rep_list) |
a1ab4c31 | 7633 | { |
9580628d | 7634 | tree gnu_rep_type, gnu_rep_part; |
ef0feeb2 | 7635 | int i, len = list_length (gnu_rep_list); |
2bb1fc26 | 7636 | tree *gnu_arr = XALLOCAVEC (tree, len); |
a1ab4c31 | 7637 | |
9580628d EB |
7638 | /* If all the fields have a rep clause, we can do a flat layout. */ |
7639 | layout_with_rep = !gnu_field_list | |
7640 | && (!gnu_variant_part || variants_have_rep); | |
7641 | gnu_rep_type | |
7642 | = layout_with_rep ? gnu_record_type : make_node (RECORD_TYPE); | |
7643 | ||
ef0feeb2 | 7644 | for (gnu_field = gnu_rep_list, i = 0; |
8cd28148 | 7645 | gnu_field; |
910ad8de | 7646 | gnu_field = DECL_CHAIN (gnu_field), i++) |
a1ab4c31 AC |
7647 | gnu_arr[i] = gnu_field; |
7648 | ||
7649 | qsort (gnu_arr, len, sizeof (tree), compare_field_bitpos); | |
7650 | ||
7651 | /* Put the fields in the list in order of increasing position, which | |
7652 | means we start from the end. */ | |
ef0feeb2 | 7653 | gnu_rep_list = NULL_TREE; |
a1ab4c31 AC |
7654 | for (i = len - 1; i >= 0; i--) |
7655 | { | |
ef0feeb2 EB |
7656 | DECL_CHAIN (gnu_arr[i]) = gnu_rep_list; |
7657 | gnu_rep_list = gnu_arr[i]; | |
a1ab4c31 AC |
7658 | DECL_CONTEXT (gnu_arr[i]) = gnu_rep_type; |
7659 | } | |
7660 | ||
9580628d EB |
7661 | if (layout_with_rep) |
7662 | gnu_field_list = gnu_rep_list; | |
7663 | else | |
a1ab4c31 | 7664 | { |
ee45a32d EB |
7665 | TYPE_REVERSE_STORAGE_ORDER (gnu_rep_type) |
7666 | = TYPE_REVERSE_STORAGE_ORDER (gnu_record_type); | |
ef0feeb2 | 7667 | finish_record_type (gnu_rep_type, gnu_rep_list, 1, debug_info); |
b1a785fb EB |
7668 | |
7669 | /* If FIRST_FREE_POS is nonzero, we need to ensure that the fields | |
7670 | without rep clause are laid out starting from this position. | |
7671 | Therefore, we force it as a minimal size on the REP part. */ | |
7672 | gnu_rep_part | |
7673 | = create_rep_part (gnu_rep_type, gnu_record_type, first_free_pos); | |
a1ab4c31 | 7674 | |
9580628d EB |
7675 | /* Chain the REP part at the beginning of the field list. */ |
7676 | DECL_CHAIN (gnu_rep_part) = gnu_field_list; | |
7677 | gnu_field_list = gnu_rep_part; | |
7678 | } | |
b1a785fb EB |
7679 | } |
7680 | ||
9580628d | 7681 | /* Chain the variant part at the end of the field list. */ |
b1a785fb | 7682 | if (gnu_variant_part) |
9580628d | 7683 | gnu_field_list = chainon (gnu_field_list, gnu_variant_part); |
b1a785fb | 7684 | |
a1ab4c31 | 7685 | if (cancel_alignment) |
fe37c7af | 7686 | SET_TYPE_ALIGN (gnu_record_type, 0); |
a1ab4c31 | 7687 | |
fd787640 | 7688 | TYPE_ARTIFICIAL (gnu_record_type) = artificial; |
9580628d EB |
7689 | |
7690 | finish_record_type (gnu_record_type, gnu_field_list, layout_with_rep ? 1 : 0, | |
7691 | debug_info && !maybe_unused); | |
7692 | ||
6bc8df24 EB |
7693 | /* Chain the fields with zero size at the beginning of the field list. */ |
7694 | if (gnu_zero_list) | |
7695 | TYPE_FIELDS (gnu_record_type) | |
7696 | = chainon (gnu_zero_list, TYPE_FIELDS (gnu_record_type)); | |
7697 | ||
9580628d | 7698 | return (gnu_rep_list && !p_gnu_rep_list) || variants_have_rep; |
a1ab4c31 AC |
7699 | } |
7700 | \f | |
7701 | /* Given GNU_SIZE, a GCC tree representing a size, return a Uint to be | |
7702 | placed into an Esize, Component_Bit_Offset, or Component_Size value | |
7703 | in the GNAT tree. */ | |
7704 | ||
7705 | static Uint | |
7706 | annotate_value (tree gnu_size) | |
7707 | { | |
a1ab4c31 | 7708 | TCode tcode; |
ce3da0d0 | 7709 | Node_Ref_Or_Val ops[3], ret, pre_op1 = No_Uint; |
0e871c15 | 7710 | struct tree_int_map in; |
586388fd | 7711 | int i; |
a1ab4c31 AC |
7712 | |
7713 | /* See if we've already saved the value for this node. */ | |
7714 | if (EXPR_P (gnu_size)) | |
7715 | { | |
0e871c15 AO |
7716 | struct tree_int_map *e; |
7717 | ||
a1ab4c31 | 7718 | in.base.from = gnu_size; |
d242408f | 7719 | e = annotate_value_cache->find (&in); |
a1ab4c31 | 7720 | |
0e871c15 AO |
7721 | if (e) |
7722 | return (Node_Ref_Or_Val) e->to; | |
a1ab4c31 | 7723 | } |
0e871c15 AO |
7724 | else |
7725 | in.base.from = NULL_TREE; | |
a1ab4c31 AC |
7726 | |
7727 | /* If we do not return inside this switch, TCODE will be set to the | |
7728 | code to use for a Create_Node operand and LEN (set above) will be | |
7729 | the number of recursive calls for us to make. */ | |
7730 | ||
7731 | switch (TREE_CODE (gnu_size)) | |
7732 | { | |
7733 | case INTEGER_CST: | |
ce3da0d0 | 7734 | return TREE_OVERFLOW (gnu_size) ? No_Uint : UI_From_gnu (gnu_size); |
a1ab4c31 AC |
7735 | |
7736 | case COMPONENT_REF: | |
7737 | /* The only case we handle here is a simple discriminant reference. */ | |
c19ff724 EB |
7738 | if (DECL_DISCRIMINANT_NUMBER (TREE_OPERAND (gnu_size, 1))) |
7739 | { | |
7740 | tree n = DECL_DISCRIMINANT_NUMBER (TREE_OPERAND (gnu_size, 1)); | |
7741 | ||
7742 | /* Climb up the chain of successive extensions, if any. */ | |
7743 | while (TREE_CODE (TREE_OPERAND (gnu_size, 0)) == COMPONENT_REF | |
7744 | && DECL_NAME (TREE_OPERAND (TREE_OPERAND (gnu_size, 0), 1)) | |
7745 | == parent_name_id) | |
7746 | gnu_size = TREE_OPERAND (gnu_size, 0); | |
7747 | ||
7748 | if (TREE_CODE (TREE_OPERAND (gnu_size, 0)) == PLACEHOLDER_EXPR) | |
7749 | return | |
7750 | Create_Node (Discrim_Val, annotate_value (n), No_Uint, No_Uint); | |
7751 | } | |
7752 | ||
7753 | return No_Uint; | |
a1ab4c31 AC |
7754 | |
7755 | CASE_CONVERT: case NON_LVALUE_EXPR: | |
7756 | return annotate_value (TREE_OPERAND (gnu_size, 0)); | |
7757 | ||
7758 | /* Now just list the operations we handle. */ | |
7759 | case COND_EXPR: tcode = Cond_Expr; break; | |
7760 | case PLUS_EXPR: tcode = Plus_Expr; break; | |
7761 | case MINUS_EXPR: tcode = Minus_Expr; break; | |
7762 | case MULT_EXPR: tcode = Mult_Expr; break; | |
7763 | case TRUNC_DIV_EXPR: tcode = Trunc_Div_Expr; break; | |
7764 | case CEIL_DIV_EXPR: tcode = Ceil_Div_Expr; break; | |
7765 | case FLOOR_DIV_EXPR: tcode = Floor_Div_Expr; break; | |
7766 | case TRUNC_MOD_EXPR: tcode = Trunc_Mod_Expr; break; | |
7767 | case CEIL_MOD_EXPR: tcode = Ceil_Mod_Expr; break; | |
7768 | case FLOOR_MOD_EXPR: tcode = Floor_Mod_Expr; break; | |
7769 | case EXACT_DIV_EXPR: tcode = Exact_Div_Expr; break; | |
7770 | case NEGATE_EXPR: tcode = Negate_Expr; break; | |
7771 | case MIN_EXPR: tcode = Min_Expr; break; | |
7772 | case MAX_EXPR: tcode = Max_Expr; break; | |
7773 | case ABS_EXPR: tcode = Abs_Expr; break; | |
7774 | case TRUTH_ANDIF_EXPR: tcode = Truth_Andif_Expr; break; | |
7775 | case TRUTH_ORIF_EXPR: tcode = Truth_Orif_Expr; break; | |
7776 | case TRUTH_AND_EXPR: tcode = Truth_And_Expr; break; | |
7777 | case TRUTH_OR_EXPR: tcode = Truth_Or_Expr; break; | |
7778 | case TRUTH_XOR_EXPR: tcode = Truth_Xor_Expr; break; | |
7779 | case TRUTH_NOT_EXPR: tcode = Truth_Not_Expr; break; | |
a1ab4c31 AC |
7780 | case LT_EXPR: tcode = Lt_Expr; break; |
7781 | case LE_EXPR: tcode = Le_Expr; break; | |
7782 | case GT_EXPR: tcode = Gt_Expr; break; | |
7783 | case GE_EXPR: tcode = Ge_Expr; break; | |
7784 | case EQ_EXPR: tcode = Eq_Expr; break; | |
7785 | case NE_EXPR: tcode = Ne_Expr; break; | |
7786 | ||
ce3da0d0 EB |
7787 | case BIT_AND_EXPR: |
7788 | tcode = Bit_And_Expr; | |
f0035dca EB |
7789 | /* For negative values in sizetype, build NEGATE_EXPR of the opposite. |
7790 | Such values appear in expressions with aligning patterns. Note that, | |
7791 | since sizetype is unsigned, we have to jump through some hoops. */ | |
ce3da0d0 EB |
7792 | if (TREE_CODE (TREE_OPERAND (gnu_size, 1)) == INTEGER_CST) |
7793 | { | |
7794 | tree op1 = TREE_OPERAND (gnu_size, 1); | |
f0035dca EB |
7795 | wide_int signed_op1 = wi::sext (op1, TYPE_PRECISION (sizetype)); |
7796 | if (wi::neg_p (signed_op1)) | |
ce3da0d0 | 7797 | { |
f0035dca | 7798 | op1 = wide_int_to_tree (sizetype, wi::neg (signed_op1)); |
ce3da0d0 EB |
7799 | pre_op1 = annotate_value (build1 (NEGATE_EXPR, sizetype, op1)); |
7800 | } | |
7801 | } | |
7802 | break; | |
7803 | ||
f82a627c | 7804 | case CALL_EXPR: |
4116e7d0 EB |
7805 | /* In regular mode, inline back only if symbolic annotation is requested |
7806 | in order to avoid memory explosion on big discriminated record types. | |
7807 | But not in ASIS mode, as symbolic annotation is required for DDA. */ | |
7808 | if (List_Representation_Info == 3 || type_annotate_only) | |
7809 | { | |
7810 | tree t = maybe_inline_call_in_expr (gnu_size); | |
7811 | if (t) | |
7812 | return annotate_value (t); | |
7813 | } | |
7814 | else | |
7815 | return Uint_Minus_1; | |
f82a627c EB |
7816 | |
7817 | /* Fall through... */ | |
7818 | ||
a1ab4c31 AC |
7819 | default: |
7820 | return No_Uint; | |
7821 | } | |
7822 | ||
7823 | /* Now get each of the operands that's relevant for this code. If any | |
7824 | cannot be expressed as a repinfo node, say we can't. */ | |
7825 | for (i = 0; i < 3; i++) | |
7826 | ops[i] = No_Uint; | |
7827 | ||
58c8f770 | 7828 | for (i = 0; i < TREE_CODE_LENGTH (TREE_CODE (gnu_size)); i++) |
a1ab4c31 | 7829 | { |
ce3da0d0 EB |
7830 | if (i == 1 && pre_op1 != No_Uint) |
7831 | ops[i] = pre_op1; | |
7832 | else | |
7833 | ops[i] = annotate_value (TREE_OPERAND (gnu_size, i)); | |
a1ab4c31 AC |
7834 | if (ops[i] == No_Uint) |
7835 | return No_Uint; | |
7836 | } | |
7837 | ||
7838 | ret = Create_Node (tcode, ops[0], ops[1], ops[2]); | |
7839 | ||
7840 | /* Save the result in the cache. */ | |
0e871c15 | 7841 | if (in.base.from) |
a1ab4c31 | 7842 | { |
0e871c15 | 7843 | struct tree_int_map **h; |
4116e7d0 EB |
7844 | /* We can't assume the hash table data hasn't moved since the initial |
7845 | look up, so we have to search again. Allocating and inserting an | |
7846 | entry at that point would be an alternative, but then we'd better | |
7847 | discard the entry if we decided not to cache it. */ | |
d242408f | 7848 | h = annotate_value_cache->find_slot (&in, INSERT); |
0e871c15 | 7849 | gcc_assert (!*h); |
766090c2 | 7850 | *h = ggc_alloc<tree_int_map> (); |
a1ab4c31 AC |
7851 | (*h)->base.from = gnu_size; |
7852 | (*h)->to = ret; | |
7853 | } | |
7854 | ||
7855 | return ret; | |
7856 | } | |
7857 | ||
f4cd2542 EB |
7858 | /* Given GNAT_ENTITY, an object (constant, variable, parameter, exception) |
7859 | and GNU_TYPE, its corresponding GCC type, set Esize and Alignment to the | |
7860 | size and alignment used by Gigi. Prefer SIZE over TYPE_SIZE if non-null. | |
491f54a7 | 7861 | BY_REF is true if the object is used by reference. */ |
f4cd2542 EB |
7862 | |
7863 | void | |
491f54a7 | 7864 | annotate_object (Entity_Id gnat_entity, tree gnu_type, tree size, bool by_ref) |
f4cd2542 EB |
7865 | { |
7866 | if (by_ref) | |
7867 | { | |
315cff15 | 7868 | if (TYPE_IS_FAT_POINTER_P (gnu_type)) |
f4cd2542 EB |
7869 | gnu_type = TYPE_UNCONSTRAINED_ARRAY (gnu_type); |
7870 | else | |
7871 | gnu_type = TREE_TYPE (gnu_type); | |
7872 | } | |
7873 | ||
7874 | if (Unknown_Esize (gnat_entity)) | |
7875 | { | |
7876 | if (TREE_CODE (gnu_type) == RECORD_TYPE | |
7877 | && TYPE_CONTAINS_TEMPLATE_P (gnu_type)) | |
910ad8de | 7878 | size = TYPE_SIZE (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (gnu_type)))); |
f4cd2542 EB |
7879 | else if (!size) |
7880 | size = TYPE_SIZE (gnu_type); | |
7881 | ||
7882 | if (size) | |
7883 | Set_Esize (gnat_entity, annotate_value (size)); | |
7884 | } | |
7885 | ||
7886 | if (Unknown_Alignment (gnat_entity)) | |
7887 | Set_Alignment (gnat_entity, | |
7888 | UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT)); | |
7889 | } | |
7890 | ||
cb3d597d EB |
7891 | /* Return first element of field list whose TREE_PURPOSE is the same as ELEM. |
7892 | Return NULL_TREE if there is no such element in the list. */ | |
73d28034 EB |
7893 | |
7894 | static tree | |
7895 | purpose_member_field (const_tree elem, tree list) | |
7896 | { | |
7897 | while (list) | |
7898 | { | |
7899 | tree field = TREE_PURPOSE (list); | |
cb3d597d | 7900 | if (SAME_FIELD_P (field, elem)) |
73d28034 EB |
7901 | return list; |
7902 | list = TREE_CHAIN (list); | |
7903 | } | |
7904 | return NULL_TREE; | |
7905 | } | |
7906 | ||
3f13dd77 EB |
7907 | /* Given GNAT_ENTITY, a record type, and GNU_TYPE, its corresponding GCC type, |
7908 | set Component_Bit_Offset and Esize of the components to the position and | |
7909 | size used by Gigi. */ | |
a1ab4c31 AC |
7910 | |
7911 | static void | |
7912 | annotate_rep (Entity_Id gnat_entity, tree gnu_type) | |
7913 | { | |
a1ab4c31 | 7914 | Entity_Id gnat_field; |
3f13dd77 | 7915 | tree gnu_list; |
a1ab4c31 | 7916 | |
3f13dd77 EB |
7917 | /* We operate by first making a list of all fields and their position (we |
7918 | can get the size easily) and then update all the sizes in the tree. */ | |
95c1c4bb EB |
7919 | gnu_list |
7920 | = build_position_list (gnu_type, false, size_zero_node, bitsize_zero_node, | |
7921 | BIGGEST_ALIGNMENT, NULL_TREE); | |
a1ab4c31 | 7922 | |
3f13dd77 EB |
7923 | for (gnat_field = First_Entity (gnat_entity); |
7924 | Present (gnat_field); | |
a1ab4c31 | 7925 | gnat_field = Next_Entity (gnat_field)) |
3f13dd77 EB |
7926 | if (Ekind (gnat_field) == E_Component |
7927 | || (Ekind (gnat_field) == E_Discriminant | |
7928 | && !Is_Unchecked_Union (Scope (gnat_field)))) | |
a1ab4c31 | 7929 | { |
73d28034 EB |
7930 | tree t = purpose_member_field (gnat_to_gnu_field_decl (gnat_field), |
7931 | gnu_list); | |
3f13dd77 | 7932 | if (t) |
a1ab4c31 | 7933 | { |
73d28034 EB |
7934 | tree parent_offset; |
7935 | ||
b38086f0 EB |
7936 | /* If we are just annotating types and the type is tagged, the tag |
7937 | and the parent components are not generated by the front-end so | |
7938 | we need to add the appropriate offset to each component without | |
7939 | representation clause. */ | |
7940 | if (type_annotate_only | |
7941 | && Is_Tagged_Type (gnat_entity) | |
7942 | && No (Component_Clause (gnat_field))) | |
a1ab4c31 | 7943 | { |
b38086f0 EB |
7944 | /* For a component appearing in the current extension, the |
7945 | offset is the size of the parent. */ | |
3f13dd77 EB |
7946 | if (Is_Derived_Type (gnat_entity) |
7947 | && Original_Record_Component (gnat_field) == gnat_field) | |
7948 | parent_offset | |
7949 | = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))), | |
7950 | bitsizetype); | |
7951 | else | |
7952 | parent_offset = bitsize_int (POINTER_SIZE); | |
b38086f0 EB |
7953 | |
7954 | if (TYPE_FIELDS (gnu_type)) | |
7955 | parent_offset | |
7956 | = round_up (parent_offset, | |
7957 | DECL_ALIGN (TYPE_FIELDS (gnu_type))); | |
a1ab4c31 | 7958 | } |
3f13dd77 EB |
7959 | else |
7960 | parent_offset = bitsize_zero_node; | |
a1ab4c31 | 7961 | |
3f13dd77 EB |
7962 | Set_Component_Bit_Offset |
7963 | (gnat_field, | |
7964 | annotate_value | |
7965 | (size_binop (PLUS_EXPR, | |
95c1c4bb EB |
7966 | bit_from_pos (TREE_VEC_ELT (TREE_VALUE (t), 0), |
7967 | TREE_VEC_ELT (TREE_VALUE (t), 2)), | |
3f13dd77 | 7968 | parent_offset))); |
a1ab4c31 AC |
7969 | |
7970 | Set_Esize (gnat_field, | |
3f13dd77 | 7971 | annotate_value (DECL_SIZE (TREE_PURPOSE (t)))); |
a1ab4c31 | 7972 | } |
3f13dd77 | 7973 | else if (Is_Tagged_Type (gnat_entity) && Is_Derived_Type (gnat_entity)) |
a1ab4c31 | 7974 | { |
3f13dd77 | 7975 | /* If there is no entry, this is an inherited component whose |
a1ab4c31 | 7976 | position is the same as in the parent type. */ |
c00d5b12 | 7977 | Entity_Id gnat_orig_field = Original_Record_Component (gnat_field); |
3f13dd77 | 7978 | |
c00d5b12 EB |
7979 | /* If we are just annotating types, discriminants renaming those of |
7980 | the parent have no entry so deal with them specifically. */ | |
7981 | if (type_annotate_only | |
7982 | && gnat_orig_field == gnat_field | |
7983 | && Ekind (gnat_field) == E_Discriminant) | |
7984 | gnat_orig_field = Corresponding_Discriminant (gnat_field); | |
7985 | ||
7986 | Set_Component_Bit_Offset (gnat_field, | |
7987 | Component_Bit_Offset (gnat_orig_field)); | |
7988 | ||
7989 | Set_Esize (gnat_field, Esize (gnat_orig_field)); | |
a1ab4c31 AC |
7990 | } |
7991 | } | |
7992 | } | |
3f13dd77 | 7993 | \f |
95c1c4bb EB |
7994 | /* Scan all fields in GNU_TYPE and return a TREE_LIST where TREE_PURPOSE is |
7995 | the FIELD_DECL and TREE_VALUE a TREE_VEC containing the byte position, the | |
7996 | value to be placed into DECL_OFFSET_ALIGN and the bit position. The list | |
7997 | of fields is flattened, except for variant parts if DO_NOT_FLATTEN_VARIANT | |
7998 | is set to true. GNU_POS is to be added to the position, GNU_BITPOS to the | |
7999 | bit position, OFFSET_ALIGN is the present offset alignment. GNU_LIST is a | |
8000 | pre-existing list to be chained to the newly created entries. */ | |
a1ab4c31 AC |
8001 | |
8002 | static tree | |
95c1c4bb EB |
8003 | build_position_list (tree gnu_type, bool do_not_flatten_variant, tree gnu_pos, |
8004 | tree gnu_bitpos, unsigned int offset_align, tree gnu_list) | |
a1ab4c31 AC |
8005 | { |
8006 | tree gnu_field; | |
a1ab4c31 | 8007 | |
3f13dd77 EB |
8008 | for (gnu_field = TYPE_FIELDS (gnu_type); |
8009 | gnu_field; | |
910ad8de | 8010 | gnu_field = DECL_CHAIN (gnu_field)) |
a1ab4c31 AC |
8011 | { |
8012 | tree gnu_our_bitpos = size_binop (PLUS_EXPR, gnu_bitpos, | |
8013 | DECL_FIELD_BIT_OFFSET (gnu_field)); | |
8014 | tree gnu_our_offset = size_binop (PLUS_EXPR, gnu_pos, | |
8015 | DECL_FIELD_OFFSET (gnu_field)); | |
8016 | unsigned int our_offset_align | |
8017 | = MIN (offset_align, DECL_OFFSET_ALIGN (gnu_field)); | |
95c1c4bb | 8018 | tree v = make_tree_vec (3); |
a1ab4c31 | 8019 | |
95c1c4bb EB |
8020 | TREE_VEC_ELT (v, 0) = gnu_our_offset; |
8021 | TREE_VEC_ELT (v, 1) = size_int (our_offset_align); | |
8022 | TREE_VEC_ELT (v, 2) = gnu_our_bitpos; | |
8023 | gnu_list = tree_cons (gnu_field, v, gnu_list); | |
a1ab4c31 | 8024 | |
95c1c4bb EB |
8025 | /* Recurse on internal fields, flattening the nested fields except for |
8026 | those in the variant part, if requested. */ | |
a1ab4c31 | 8027 | if (DECL_INTERNAL_P (gnu_field)) |
95c1c4bb EB |
8028 | { |
8029 | tree gnu_field_type = TREE_TYPE (gnu_field); | |
8030 | if (do_not_flatten_variant | |
8031 | && TREE_CODE (gnu_field_type) == QUAL_UNION_TYPE) | |
8032 | gnu_list | |
8033 | = build_position_list (gnu_field_type, do_not_flatten_variant, | |
8034 | size_zero_node, bitsize_zero_node, | |
8035 | BIGGEST_ALIGNMENT, gnu_list); | |
8036 | else | |
8037 | gnu_list | |
8038 | = build_position_list (gnu_field_type, do_not_flatten_variant, | |
a1ab4c31 | 8039 | gnu_our_offset, gnu_our_bitpos, |
95c1c4bb EB |
8040 | our_offset_align, gnu_list); |
8041 | } | |
8042 | } | |
8043 | ||
8044 | return gnu_list; | |
8045 | } | |
8046 | ||
f54ee980 | 8047 | /* Return a list describing the substitutions needed to reflect the |
95c1c4bb | 8048 | discriminant substitutions from GNAT_TYPE to GNAT_SUBTYPE. They can |
f54ee980 | 8049 | be in any order. The values in an element of the list are in the form |
e3554601 NF |
8050 | of operands to SUBSTITUTE_IN_EXPR. DEFINITION is true if this is for |
8051 | a definition of GNAT_SUBTYPE. */ | |
95c1c4bb | 8052 | |
b16b6cc9 | 8053 | static vec<subst_pair> |
95c1c4bb EB |
8054 | build_subst_list (Entity_Id gnat_subtype, Entity_Id gnat_type, bool definition) |
8055 | { | |
6e1aa848 | 8056 | vec<subst_pair> gnu_list = vNULL; |
95c1c4bb | 8057 | Entity_Id gnat_discrim; |
908ba941 | 8058 | Node_Id gnat_constr; |
95c1c4bb EB |
8059 | |
8060 | for (gnat_discrim = First_Stored_Discriminant (gnat_type), | |
908ba941 | 8061 | gnat_constr = First_Elmt (Stored_Constraint (gnat_subtype)); |
95c1c4bb EB |
8062 | Present (gnat_discrim); |
8063 | gnat_discrim = Next_Stored_Discriminant (gnat_discrim), | |
908ba941 | 8064 | gnat_constr = Next_Elmt (gnat_constr)) |
95c1c4bb | 8065 | /* Ignore access discriminants. */ |
908ba941 | 8066 | if (!Is_Access_Type (Etype (Node (gnat_constr)))) |
3c28a5f4 EB |
8067 | { |
8068 | tree gnu_field = gnat_to_gnu_field_decl (gnat_discrim); | |
e3554601 NF |
8069 | tree replacement = convert (TREE_TYPE (gnu_field), |
8070 | elaborate_expression | |
908ba941 | 8071 | (Node (gnat_constr), gnat_subtype, |
bf44701f | 8072 | get_entity_char (gnat_discrim), |
e3554601 | 8073 | definition, true, false)); |
f32682ca | 8074 | subst_pair s = {gnu_field, replacement}; |
9771b263 | 8075 | gnu_list.safe_push (s); |
3c28a5f4 | 8076 | } |
95c1c4bb | 8077 | |
f54ee980 | 8078 | return gnu_list; |
95c1c4bb EB |
8079 | } |
8080 | ||
f54ee980 | 8081 | /* Scan all fields in QUAL_UNION_TYPE and return a list describing the |
fb7fb701 | 8082 | variants of QUAL_UNION_TYPE that are still relevant after applying |
f54ee980 EB |
8083 | the substitutions described in SUBST_LIST. GNU_LIST is a pre-existing |
8084 | list to be prepended to the newly created entries. */ | |
95c1c4bb | 8085 | |
b16b6cc9 | 8086 | static vec<variant_desc> |
9771b263 DN |
8087 | build_variant_list (tree qual_union_type, vec<subst_pair> subst_list, |
8088 | vec<variant_desc> gnu_list) | |
95c1c4bb EB |
8089 | { |
8090 | tree gnu_field; | |
8091 | ||
8092 | for (gnu_field = TYPE_FIELDS (qual_union_type); | |
8093 | gnu_field; | |
910ad8de | 8094 | gnu_field = DECL_CHAIN (gnu_field)) |
95c1c4bb | 8095 | { |
e3554601 | 8096 | tree qual = DECL_QUALIFIER (gnu_field); |
f54ee980 | 8097 | unsigned int i; |
e3554601 | 8098 | subst_pair *s; |
95c1c4bb | 8099 | |
9771b263 | 8100 | FOR_EACH_VEC_ELT (subst_list, i, s) |
e3554601 | 8101 | qual = SUBSTITUTE_IN_EXPR (qual, s->discriminant, s->replacement); |
95c1c4bb EB |
8102 | |
8103 | /* If the new qualifier is not unconditionally false, its variant may | |
8104 | still be accessed. */ | |
8105 | if (!integer_zerop (qual)) | |
8106 | { | |
8107 | tree variant_type = TREE_TYPE (gnu_field), variant_subpart; | |
f32682ca | 8108 | variant_desc v = {variant_type, gnu_field, qual, NULL_TREE}; |
fb7fb701 | 8109 | |
9771b263 | 8110 | gnu_list.safe_push (v); |
95c1c4bb EB |
8111 | |
8112 | /* Recurse on the variant subpart of the variant, if any. */ | |
8113 | variant_subpart = get_variant_part (variant_type); | |
8114 | if (variant_subpart) | |
f54ee980 EB |
8115 | gnu_list = build_variant_list (TREE_TYPE (variant_subpart), |
8116 | subst_list, gnu_list); | |
95c1c4bb EB |
8117 | |
8118 | /* If the new qualifier is unconditionally true, the subsequent | |
8119 | variants cannot be accessed. */ | |
8120 | if (integer_onep (qual)) | |
8121 | break; | |
8122 | } | |
a1ab4c31 AC |
8123 | } |
8124 | ||
f54ee980 | 8125 | return gnu_list; |
a1ab4c31 AC |
8126 | } |
8127 | \f | |
8128 | /* UINT_SIZE is a Uint giving the specified size for an object of GNU_TYPE | |
0d853156 EB |
8129 | corresponding to GNAT_OBJECT. If the size is valid, return an INTEGER_CST |
8130 | corresponding to its value. Otherwise, return NULL_TREE. KIND is set to | |
8131 | VAR_DECL if we are specifying the size of an object, TYPE_DECL for the | |
8132 | size of a type, and FIELD_DECL for the size of a field. COMPONENT_P is | |
8133 | true if we are being called to process the Component_Size of GNAT_OBJECT; | |
8134 | this is used only for error messages. ZERO_OK is true if a size of zero | |
8135 | is permitted; if ZERO_OK is false, it means that a size of zero should be | |
8136 | treated as an unspecified size. */ | |
a1ab4c31 AC |
8137 | |
8138 | static tree | |
8139 | validate_size (Uint uint_size, tree gnu_type, Entity_Id gnat_object, | |
8140 | enum tree_code kind, bool component_p, bool zero_ok) | |
8141 | { | |
8142 | Node_Id gnat_error_node; | |
8143 | tree type_size, size; | |
8144 | ||
8ff6c664 EB |
8145 | /* Return 0 if no size was specified. */ |
8146 | if (uint_size == No_Uint) | |
8147 | return NULL_TREE; | |
a1ab4c31 | 8148 | |
728936bb EB |
8149 | /* Ignore a negative size since that corresponds to our back-annotation. */ |
8150 | if (UI_Lt (uint_size, Uint_0)) | |
8151 | return NULL_TREE; | |
8152 | ||
0d853156 | 8153 | /* Find the node to use for error messages. */ |
a1ab4c31 AC |
8154 | if ((Ekind (gnat_object) == E_Component |
8155 | || Ekind (gnat_object) == E_Discriminant) | |
8156 | && Present (Component_Clause (gnat_object))) | |
8157 | gnat_error_node = Last_Bit (Component_Clause (gnat_object)); | |
8158 | else if (Present (Size_Clause (gnat_object))) | |
8159 | gnat_error_node = Expression (Size_Clause (gnat_object)); | |
8160 | else | |
8161 | gnat_error_node = gnat_object; | |
8162 | ||
0d853156 EB |
8163 | /* Get the size as an INTEGER_CST. Issue an error if a size was specified |
8164 | but cannot be represented in bitsizetype. */ | |
a1ab4c31 AC |
8165 | size = UI_To_gnu (uint_size, bitsizetype); |
8166 | if (TREE_OVERFLOW (size)) | |
8167 | { | |
8ff6c664 | 8168 | if (component_p) |
0d853156 | 8169 | post_error_ne ("component size for& is too large", gnat_error_node, |
8ff6c664 EB |
8170 | gnat_object); |
8171 | else | |
0d853156 | 8172 | post_error_ne ("size for& is too large", gnat_error_node, |
8ff6c664 | 8173 | gnat_object); |
a1ab4c31 AC |
8174 | return NULL_TREE; |
8175 | } | |
8176 | ||
728936bb EB |
8177 | /* Ignore a zero size if it is not permitted. */ |
8178 | if (!zero_ok && integer_zerop (size)) | |
a1ab4c31 AC |
8179 | return NULL_TREE; |
8180 | ||
8181 | /* The size of objects is always a multiple of a byte. */ | |
8182 | if (kind == VAR_DECL | |
8183 | && !integer_zerop (size_binop (TRUNC_MOD_EXPR, size, bitsize_unit_node))) | |
8184 | { | |
8185 | if (component_p) | |
8186 | post_error_ne ("component size for& is not a multiple of Storage_Unit", | |
8187 | gnat_error_node, gnat_object); | |
8188 | else | |
8189 | post_error_ne ("size for& is not a multiple of Storage_Unit", | |
8190 | gnat_error_node, gnat_object); | |
8191 | return NULL_TREE; | |
8192 | } | |
8193 | ||
8194 | /* If this is an integral type or a packed array type, the front-end has | |
0d853156 | 8195 | already verified the size, so we need not do it here (which would mean |
a8e05f92 EB |
8196 | checking against the bounds). However, if this is an aliased object, |
8197 | it may not be smaller than the type of the object. */ | |
a1ab4c31 AC |
8198 | if ((INTEGRAL_TYPE_P (gnu_type) || TYPE_IS_PACKED_ARRAY_TYPE_P (gnu_type)) |
8199 | && !(kind == VAR_DECL && Is_Aliased (gnat_object))) | |
8200 | return size; | |
8201 | ||
0d853156 EB |
8202 | /* If the object is a record that contains a template, add the size of the |
8203 | template to the specified size. */ | |
a1ab4c31 AC |
8204 | if (TREE_CODE (gnu_type) == RECORD_TYPE |
8205 | && TYPE_CONTAINS_TEMPLATE_P (gnu_type)) | |
8206 | size = size_binop (PLUS_EXPR, DECL_SIZE (TYPE_FIELDS (gnu_type)), size); | |
8207 | ||
8ff6c664 EB |
8208 | if (kind == VAR_DECL |
8209 | /* If a type needs strict alignment, a component of this type in | |
8210 | a packed record cannot be packed and thus uses the type size. */ | |
8211 | || (kind == TYPE_DECL && Strict_Alignment (gnat_object))) | |
8212 | type_size = TYPE_SIZE (gnu_type); | |
8213 | else | |
8214 | type_size = rm_size (gnu_type); | |
8215 | ||
0d853156 | 8216 | /* Modify the size of a discriminated type to be the maximum size. */ |
a1ab4c31 AC |
8217 | if (type_size && CONTAINS_PLACEHOLDER_P (type_size)) |
8218 | type_size = max_size (type_size, true); | |
8219 | ||
8220 | /* If this is an access type or a fat pointer, the minimum size is that given | |
8221 | by the smallest integral mode that's valid for pointers. */ | |
315cff15 | 8222 | if (TREE_CODE (gnu_type) == POINTER_TYPE || TYPE_IS_FAT_POINTER_P (gnu_type)) |
a1ab4c31 | 8223 | { |
ef4bddc2 | 8224 | machine_mode p_mode = GET_CLASS_NARROWEST_MODE (MODE_INT); |
8ff6c664 EB |
8225 | while (!targetm.valid_pointer_mode (p_mode)) |
8226 | p_mode = GET_MODE_WIDER_MODE (p_mode); | |
a1ab4c31 AC |
8227 | type_size = bitsize_int (GET_MODE_BITSIZE (p_mode)); |
8228 | } | |
8229 | ||
0d853156 EB |
8230 | /* Issue an error either if the default size of the object isn't a constant |
8231 | or if the new size is smaller than it. */ | |
a1ab4c31 AC |
8232 | if (TREE_CODE (type_size) != INTEGER_CST |
8233 | || TREE_OVERFLOW (type_size) | |
8234 | || tree_int_cst_lt (size, type_size)) | |
8235 | { | |
8236 | if (component_p) | |
8237 | post_error_ne_tree | |
8238 | ("component size for& too small{, minimum allowed is ^}", | |
8239 | gnat_error_node, gnat_object, type_size); | |
8240 | else | |
8ff6c664 EB |
8241 | post_error_ne_tree |
8242 | ("size for& too small{, minimum allowed is ^}", | |
8243 | gnat_error_node, gnat_object, type_size); | |
0d853156 | 8244 | return NULL_TREE; |
a1ab4c31 AC |
8245 | } |
8246 | ||
8247 | return size; | |
8248 | } | |
8249 | \f | |
0d853156 EB |
8250 | /* Similarly, but both validate and process a value of RM size. This routine |
8251 | is only called for types. */ | |
a1ab4c31 AC |
8252 | |
8253 | static void | |
8254 | set_rm_size (Uint uint_size, tree gnu_type, Entity_Id gnat_entity) | |
8255 | { | |
8ff6c664 EB |
8256 | Node_Id gnat_attr_node; |
8257 | tree old_size, size; | |
8258 | ||
8259 | /* Do nothing if no size was specified. */ | |
8260 | if (uint_size == No_Uint) | |
8261 | return; | |
8262 | ||
728936bb EB |
8263 | /* Ignore a negative size since that corresponds to our back-annotation. */ |
8264 | if (UI_Lt (uint_size, Uint_0)) | |
8265 | return; | |
8266 | ||
a8e05f92 | 8267 | /* Only issue an error if a Value_Size clause was explicitly given. |
a1ab4c31 | 8268 | Otherwise, we'd be duplicating an error on the Size clause. */ |
8ff6c664 | 8269 | gnat_attr_node |
a1ab4c31 | 8270 | = Get_Attribute_Definition_Clause (gnat_entity, Attr_Value_Size); |
a1ab4c31 | 8271 | |
0d853156 EB |
8272 | /* Get the size as an INTEGER_CST. Issue an error if a size was specified |
8273 | but cannot be represented in bitsizetype. */ | |
a1ab4c31 AC |
8274 | size = UI_To_gnu (uint_size, bitsizetype); |
8275 | if (TREE_OVERFLOW (size)) | |
8276 | { | |
8277 | if (Present (gnat_attr_node)) | |
0d853156 | 8278 | post_error_ne ("Value_Size for& is too large", gnat_attr_node, |
a1ab4c31 | 8279 | gnat_entity); |
a1ab4c31 AC |
8280 | return; |
8281 | } | |
8282 | ||
728936bb EB |
8283 | /* Ignore a zero size unless a Value_Size clause exists, or a size clause |
8284 | exists, or this is an integer type, in which case the front-end will | |
8285 | have always set it. */ | |
8286 | if (No (gnat_attr_node) | |
8287 | && integer_zerop (size) | |
8288 | && !Has_Size_Clause (gnat_entity) | |
8289 | && !Is_Discrete_Or_Fixed_Point_Type (gnat_entity)) | |
a1ab4c31 AC |
8290 | return; |
8291 | ||
8ff6c664 EB |
8292 | old_size = rm_size (gnu_type); |
8293 | ||
a1ab4c31 AC |
8294 | /* If the old size is self-referential, get the maximum size. */ |
8295 | if (CONTAINS_PLACEHOLDER_P (old_size)) | |
8296 | old_size = max_size (old_size, true); | |
8297 | ||
0d853156 EB |
8298 | /* Issue an error either if the old size of the object isn't a constant or |
8299 | if the new size is smaller than it. The front-end has already verified | |
8300 | this for scalar and packed array types. */ | |
a1ab4c31 AC |
8301 | if (TREE_CODE (old_size) != INTEGER_CST |
8302 | || TREE_OVERFLOW (old_size) | |
03049a4e EB |
8303 | || (AGGREGATE_TYPE_P (gnu_type) |
8304 | && !(TREE_CODE (gnu_type) == ARRAY_TYPE | |
8305 | && TYPE_PACKED_ARRAY_TYPE_P (gnu_type)) | |
315cff15 | 8306 | && !(TYPE_IS_PADDING_P (gnu_type) |
03049a4e | 8307 | && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type))) == ARRAY_TYPE |
58c8f770 EB |
8308 | && TYPE_PACKED_ARRAY_TYPE_P |
8309 | (TREE_TYPE (TYPE_FIELDS (gnu_type)))) | |
03049a4e | 8310 | && tree_int_cst_lt (size, old_size))) |
a1ab4c31 AC |
8311 | { |
8312 | if (Present (gnat_attr_node)) | |
8313 | post_error_ne_tree | |
8314 | ("Value_Size for& too small{, minimum allowed is ^}", | |
8315 | gnat_attr_node, gnat_entity, old_size); | |
a1ab4c31 AC |
8316 | return; |
8317 | } | |
8318 | ||
e6e15ec9 | 8319 | /* Otherwise, set the RM size proper for integral types... */ |
b4680ca1 EB |
8320 | if ((TREE_CODE (gnu_type) == INTEGER_TYPE |
8321 | && Is_Discrete_Or_Fixed_Point_Type (gnat_entity)) | |
8322 | || (TREE_CODE (gnu_type) == ENUMERAL_TYPE | |
8323 | || TREE_CODE (gnu_type) == BOOLEAN_TYPE)) | |
84fb43a1 | 8324 | SET_TYPE_RM_SIZE (gnu_type, size); |
b4680ca1 EB |
8325 | |
8326 | /* ...or the Ada size for record and union types. */ | |
e1e5852c | 8327 | else if (RECORD_OR_UNION_TYPE_P (gnu_type) |
315cff15 | 8328 | && !TYPE_FAT_POINTER_P (gnu_type)) |
a1ab4c31 AC |
8329 | SET_TYPE_ADA_SIZE (gnu_type, size); |
8330 | } | |
8331 | \f | |
a1ab4c31 AC |
8332 | /* ALIGNMENT is a Uint giving the alignment specified for GNAT_ENTITY, |
8333 | a type or object whose present alignment is ALIGN. If this alignment is | |
8334 | valid, return it. Otherwise, give an error and return ALIGN. */ | |
8335 | ||
8336 | static unsigned int | |
8337 | validate_alignment (Uint alignment, Entity_Id gnat_entity, unsigned int align) | |
8338 | { | |
8339 | unsigned int max_allowed_alignment = get_target_maximum_allowed_alignment (); | |
8340 | unsigned int new_align; | |
8341 | Node_Id gnat_error_node; | |
8342 | ||
8343 | /* Don't worry about checking alignment if alignment was not specified | |
8344 | by the source program and we already posted an error for this entity. */ | |
8345 | if (Error_Posted (gnat_entity) && !Has_Alignment_Clause (gnat_entity)) | |
8346 | return align; | |
8347 | ||
ec88784d AC |
8348 | /* Post the error on the alignment clause if any. Note, for the implicit |
8349 | base type of an array type, the alignment clause is on the first | |
8350 | subtype. */ | |
a1ab4c31 AC |
8351 | if (Present (Alignment_Clause (gnat_entity))) |
8352 | gnat_error_node = Expression (Alignment_Clause (gnat_entity)); | |
ec88784d AC |
8353 | |
8354 | else if (Is_Itype (gnat_entity) | |
8355 | && Is_Array_Type (gnat_entity) | |
8356 | && Etype (gnat_entity) == gnat_entity | |
8357 | && Present (Alignment_Clause (First_Subtype (gnat_entity)))) | |
8358 | gnat_error_node = | |
8359 | Expression (Alignment_Clause (First_Subtype (gnat_entity))); | |
8360 | ||
a1ab4c31 AC |
8361 | else |
8362 | gnat_error_node = gnat_entity; | |
8363 | ||
8364 | /* Within GCC, an alignment is an integer, so we must make sure a value is | |
8365 | specified that fits in that range. Also, there is an upper bound to | |
8366 | alignments we can support/allow. */ | |
8367 | if (!UI_Is_In_Int_Range (alignment) | |
8368 | || ((new_align = UI_To_Int (alignment)) > max_allowed_alignment)) | |
8369 | post_error_ne_num ("largest supported alignment for& is ^", | |
8370 | gnat_error_node, gnat_entity, max_allowed_alignment); | |
8371 | else if (!(Present (Alignment_Clause (gnat_entity)) | |
8372 | && From_At_Mod (Alignment_Clause (gnat_entity))) | |
8373 | && new_align * BITS_PER_UNIT < align) | |
caa9d12a EB |
8374 | { |
8375 | unsigned int double_align; | |
8376 | bool is_capped_double, align_clause; | |
8377 | ||
8378 | /* If the default alignment of "double" or larger scalar types is | |
8379 | specifically capped and the new alignment is above the cap, do | |
8380 | not post an error and change the alignment only if there is an | |
8381 | alignment clause; this makes it possible to have the associated | |
8382 | GCC type overaligned by default for performance reasons. */ | |
8383 | if ((double_align = double_float_alignment) > 0) | |
8384 | { | |
8385 | Entity_Id gnat_type | |
8386 | = Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity); | |
8387 | is_capped_double | |
8388 | = is_double_float_or_array (gnat_type, &align_clause); | |
8389 | } | |
8390 | else if ((double_align = double_scalar_alignment) > 0) | |
8391 | { | |
8392 | Entity_Id gnat_type | |
8393 | = Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity); | |
8394 | is_capped_double | |
8395 | = is_double_scalar_or_array (gnat_type, &align_clause); | |
8396 | } | |
8397 | else | |
8398 | is_capped_double = align_clause = false; | |
8399 | ||
8400 | if (is_capped_double && new_align >= double_align) | |
8401 | { | |
8402 | if (align_clause) | |
8403 | align = new_align * BITS_PER_UNIT; | |
8404 | } | |
8405 | else | |
8406 | { | |
8407 | if (is_capped_double) | |
8408 | align = double_align * BITS_PER_UNIT; | |
8409 | ||
8410 | post_error_ne_num ("alignment for& must be at least ^", | |
8411 | gnat_error_node, gnat_entity, | |
8412 | align / BITS_PER_UNIT); | |
8413 | } | |
8414 | } | |
a1ab4c31 AC |
8415 | else |
8416 | { | |
8417 | new_align = (new_align > 0 ? new_align * BITS_PER_UNIT : 1); | |
8418 | if (new_align > align) | |
8419 | align = new_align; | |
8420 | } | |
8421 | ||
8422 | return align; | |
8423 | } | |
a1ab4c31 | 8424 | \f |
86a8ba5b EB |
8425 | /* Verify that TYPE is something we can implement atomically. If not, issue |
8426 | an error for GNAT_ENTITY. COMPONENT_P is true if we are being called to | |
8427 | process a component type. */ | |
a1ab4c31 AC |
8428 | |
8429 | static void | |
86a8ba5b | 8430 | check_ok_for_atomic_type (tree type, Entity_Id gnat_entity, bool component_p) |
a1ab4c31 AC |
8431 | { |
8432 | Node_Id gnat_error_point = gnat_entity; | |
8433 | Node_Id gnat_node; | |
ef4bddc2 | 8434 | machine_mode mode; |
86a8ba5b | 8435 | enum mode_class mclass; |
a1ab4c31 AC |
8436 | unsigned int align; |
8437 | tree size; | |
8438 | ||
86a8ba5b EB |
8439 | /* If this is an anonymous base type, nothing to check, the error will be |
8440 | reported on the source type if need be. */ | |
8441 | if (!Comes_From_Source (gnat_entity)) | |
8442 | return; | |
a1ab4c31 | 8443 | |
86a8ba5b EB |
8444 | mode = TYPE_MODE (type); |
8445 | mclass = GET_MODE_CLASS (mode); | |
8446 | align = TYPE_ALIGN (type); | |
8447 | size = TYPE_SIZE (type); | |
8448 | ||
8449 | /* Consider all aligned floating-point types atomic and any aligned types | |
8450 | that are represented by integers no wider than a machine word. */ | |
8451 | if ((mclass == MODE_FLOAT | |
8452 | || ((mclass == MODE_INT || mclass == MODE_PARTIAL_INT) | |
8453 | && GET_MODE_BITSIZE (mode) <= BITS_PER_WORD)) | |
8454 | && align >= GET_MODE_ALIGNMENT (mode)) | |
a1ab4c31 AC |
8455 | return; |
8456 | ||
86a8ba5b EB |
8457 | /* For the moment, also allow anything that has an alignment equal to its |
8458 | size and which is smaller than a word. */ | |
8459 | if (size | |
8460 | && TREE_CODE (size) == INTEGER_CST | |
a1ab4c31 AC |
8461 | && compare_tree_int (size, align) == 0 |
8462 | && align <= BITS_PER_WORD) | |
8463 | return; | |
8464 | ||
86a8ba5b EB |
8465 | for (gnat_node = First_Rep_Item (gnat_entity); |
8466 | Present (gnat_node); | |
a1ab4c31 | 8467 | gnat_node = Next_Rep_Item (gnat_node)) |
86a8ba5b EB |
8468 | if (Nkind (gnat_node) == N_Pragma) |
8469 | { | |
8470 | unsigned char pragma_id | |
8471 | = Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node))); | |
8472 | ||
8473 | if ((pragma_id == Pragma_Atomic && !component_p) | |
8474 | || (pragma_id == Pragma_Atomic_Components && component_p)) | |
8475 | { | |
8476 | gnat_error_point = First (Pragma_Argument_Associations (gnat_node)); | |
8477 | break; | |
8478 | } | |
8479 | } | |
a1ab4c31 | 8480 | |
86a8ba5b | 8481 | if (component_p) |
a1ab4c31 AC |
8482 | post_error_ne ("atomic access to component of & cannot be guaranteed", |
8483 | gnat_error_point, gnat_entity); | |
f797c2b7 EB |
8484 | else if (Is_Volatile_Full_Access (gnat_entity)) |
8485 | post_error_ne ("volatile full access to & cannot be guaranteed", | |
8486 | gnat_error_point, gnat_entity); | |
a1ab4c31 AC |
8487 | else |
8488 | post_error_ne ("atomic access to & cannot be guaranteed", | |
8489 | gnat_error_point, gnat_entity); | |
8490 | } | |
8491 | \f | |
a1ab4c31 | 8492 | |
1515785d OH |
8493 | /* Helper for the intrin compatibility checks family. Evaluate whether |
8494 | two types are definitely incompatible. */ | |
a1ab4c31 | 8495 | |
1515785d OH |
8496 | static bool |
8497 | intrin_types_incompatible_p (tree t1, tree t2) | |
8498 | { | |
8499 | enum tree_code code; | |
8500 | ||
8501 | if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2)) | |
8502 | return false; | |
8503 | ||
8504 | if (TYPE_MODE (t1) != TYPE_MODE (t2)) | |
8505 | return true; | |
8506 | ||
8507 | if (TREE_CODE (t1) != TREE_CODE (t2)) | |
8508 | return true; | |
8509 | ||
8510 | code = TREE_CODE (t1); | |
8511 | ||
8512 | switch (code) | |
8513 | { | |
8514 | case INTEGER_TYPE: | |
8515 | case REAL_TYPE: | |
8516 | return TYPE_PRECISION (t1) != TYPE_PRECISION (t2); | |
8517 | ||
8518 | case POINTER_TYPE: | |
8519 | case REFERENCE_TYPE: | |
8520 | /* Assume designated types are ok. We'd need to account for char * and | |
8521 | void * variants to do better, which could rapidly get messy and isn't | |
8522 | clearly worth the effort. */ | |
8523 | return false; | |
8524 | ||
8525 | default: | |
8526 | break; | |
8527 | } | |
8528 | ||
8529 | return false; | |
8530 | } | |
8531 | ||
8532 | /* Helper for intrin_profiles_compatible_p, to perform compatibility checks | |
8533 | on the Ada/builtin argument lists for the INB binding. */ | |
8534 | ||
8535 | static bool | |
8536 | intrin_arglists_compatible_p (intrin_binding_t * inb) | |
a1ab4c31 | 8537 | { |
d7d058c5 NF |
8538 | function_args_iterator ada_iter, btin_iter; |
8539 | ||
8540 | function_args_iter_init (&ada_iter, inb->ada_fntype); | |
8541 | function_args_iter_init (&btin_iter, inb->btin_fntype); | |
1515785d OH |
8542 | |
8543 | /* Sequence position of the last argument we checked. */ | |
8544 | int argpos = 0; | |
8545 | ||
7c775aca | 8546 | while (true) |
1515785d | 8547 | { |
d7d058c5 NF |
8548 | tree ada_type = function_args_iter_cond (&ada_iter); |
8549 | tree btin_type = function_args_iter_cond (&btin_iter); | |
8550 | ||
8551 | /* If we've exhausted both lists simultaneously, we're done. */ | |
7c775aca | 8552 | if (!ada_type && !btin_type) |
d7d058c5 | 8553 | break; |
1515785d OH |
8554 | |
8555 | /* If one list is shorter than the other, they fail to match. */ | |
7c775aca | 8556 | if (!ada_type || !btin_type) |
1515785d OH |
8557 | return false; |
8558 | ||
1515785d | 8559 | /* If we're done with the Ada args and not with the internal builtin |
bb511fbd | 8560 | args, or the other way around, complain. */ |
1515785d OH |
8561 | if (ada_type == void_type_node |
8562 | && btin_type != void_type_node) | |
8563 | { | |
8564 | post_error ("?Ada arguments list too short!", inb->gnat_entity); | |
8565 | return false; | |
8566 | } | |
8567 | ||
1515785d OH |
8568 | if (btin_type == void_type_node |
8569 | && ada_type != void_type_node) | |
8570 | { | |
bb511fbd OH |
8571 | post_error_ne_num ("?Ada arguments list too long ('> ^)!", |
8572 | inb->gnat_entity, inb->gnat_entity, argpos); | |
8573 | return false; | |
1515785d OH |
8574 | } |
8575 | ||
8576 | /* Otherwise, check that types match for the current argument. */ | |
8577 | argpos ++; | |
8578 | if (intrin_types_incompatible_p (ada_type, btin_type)) | |
8579 | { | |
8580 | post_error_ne_num ("?intrinsic binding type mismatch on argument ^!", | |
8581 | inb->gnat_entity, inb->gnat_entity, argpos); | |
8582 | return false; | |
8583 | } | |
8584 | ||
f620bd21 | 8585 | |
d7d058c5 NF |
8586 | function_args_iter_next (&ada_iter); |
8587 | function_args_iter_next (&btin_iter); | |
1515785d OH |
8588 | } |
8589 | ||
8590 | return true; | |
8591 | } | |
8592 | ||
8593 | /* Helper for intrin_profiles_compatible_p, to perform compatibility checks | |
8594 | on the Ada/builtin return values for the INB binding. */ | |
8595 | ||
8596 | static bool | |
8597 | intrin_return_compatible_p (intrin_binding_t * inb) | |
8598 | { | |
8599 | tree ada_return_type = TREE_TYPE (inb->ada_fntype); | |
8600 | tree btin_return_type = TREE_TYPE (inb->btin_fntype); | |
8601 | ||
bb511fbd | 8602 | /* Accept function imported as procedure, common and convenient. */ |
1515785d OH |
8603 | if (VOID_TYPE_P (ada_return_type) |
8604 | && !VOID_TYPE_P (btin_return_type)) | |
bb511fbd | 8605 | return true; |
1515785d | 8606 | |
b15062a8 | 8607 | /* If return type is Address (integer type), map it to void *. */ |
6e9ecd1f | 8608 | if (Is_Descendant_Of_Address (Etype (inb->gnat_entity))) |
1366ba41 | 8609 | ada_return_type = ptr_type_node; |
b15062a8 | 8610 | |
bb511fbd OH |
8611 | /* Check return types compatibility otherwise. Note that this |
8612 | handles void/void as well. */ | |
1515785d OH |
8613 | if (intrin_types_incompatible_p (btin_return_type, ada_return_type)) |
8614 | { | |
8615 | post_error ("?intrinsic binding type mismatch on return value!", | |
8616 | inb->gnat_entity); | |
8617 | return false; | |
8618 | } | |
8619 | ||
8620 | return true; | |
8621 | } | |
8622 | ||
8623 | /* Check and return whether the Ada and gcc builtin profiles bound by INB are | |
8624 | compatible. Issue relevant warnings when they are not. | |
8625 | ||
8626 | This is intended as a light check to diagnose the most obvious cases, not | |
308e6f3a | 8627 | as a full fledged type compatibility predicate. It is the programmer's |
1515785d OH |
8628 | responsibility to ensure correctness of the Ada declarations in Imports, |
8629 | especially when binding straight to a compiler internal. */ | |
8630 | ||
8631 | static bool | |
8632 | intrin_profiles_compatible_p (intrin_binding_t * inb) | |
8633 | { | |
8634 | /* Check compatibility on return values and argument lists, each responsible | |
8635 | for posting warnings as appropriate. Ensure use of the proper sloc for | |
8636 | this purpose. */ | |
8637 | ||
8638 | bool arglists_compatible_p, return_compatible_p; | |
8639 | location_t saved_location = input_location; | |
8640 | ||
8641 | Sloc_to_locus (Sloc (inb->gnat_entity), &input_location); | |
a1ab4c31 | 8642 | |
1515785d OH |
8643 | return_compatible_p = intrin_return_compatible_p (inb); |
8644 | arglists_compatible_p = intrin_arglists_compatible_p (inb); | |
a1ab4c31 | 8645 | |
1515785d | 8646 | input_location = saved_location; |
a1ab4c31 | 8647 | |
1515785d | 8648 | return return_compatible_p && arglists_compatible_p; |
a1ab4c31 AC |
8649 | } |
8650 | \f | |
95c1c4bb EB |
8651 | /* Return a FIELD_DECL node modeled on OLD_FIELD. FIELD_TYPE is its type |
8652 | and RECORD_TYPE is the type of the parent. If SIZE is nonzero, it is the | |
8653 | specified size for this field. POS_LIST is a position list describing | |
8654 | the layout of OLD_FIELD and SUBST_LIST a substitution list to be applied | |
8655 | to this layout. */ | |
8656 | ||
8657 | static tree | |
8658 | create_field_decl_from (tree old_field, tree field_type, tree record_type, | |
e3554601 | 8659 | tree size, tree pos_list, |
9771b263 | 8660 | vec<subst_pair> subst_list) |
95c1c4bb EB |
8661 | { |
8662 | tree t = TREE_VALUE (purpose_member (old_field, pos_list)); | |
8663 | tree pos = TREE_VEC_ELT (t, 0), bitpos = TREE_VEC_ELT (t, 2); | |
ae7e9ddd | 8664 | unsigned int offset_align = tree_to_uhwi (TREE_VEC_ELT (t, 1)); |
95c1c4bb | 8665 | tree new_pos, new_field; |
f54ee980 | 8666 | unsigned int i; |
e3554601 | 8667 | subst_pair *s; |
95c1c4bb EB |
8668 | |
8669 | if (CONTAINS_PLACEHOLDER_P (pos)) | |
9771b263 | 8670 | FOR_EACH_VEC_ELT (subst_list, i, s) |
e3554601 | 8671 | pos = SUBSTITUTE_IN_EXPR (pos, s->discriminant, s->replacement); |
95c1c4bb EB |
8672 | |
8673 | /* If the position is now a constant, we can set it as the position of the | |
8674 | field when we make it. Otherwise, we need to deal with it specially. */ | |
8675 | if (TREE_CONSTANT (pos)) | |
8676 | new_pos = bit_from_pos (pos, bitpos); | |
8677 | else | |
8678 | new_pos = NULL_TREE; | |
8679 | ||
8680 | new_field | |
8681 | = create_field_decl (DECL_NAME (old_field), field_type, record_type, | |
da01bfee | 8682 | size, new_pos, DECL_PACKED (old_field), |
95c1c4bb EB |
8683 | !DECL_NONADDRESSABLE_P (old_field)); |
8684 | ||
8685 | if (!new_pos) | |
8686 | { | |
8687 | normalize_offset (&pos, &bitpos, offset_align); | |
cb27986c EB |
8688 | /* Finalize the position. */ |
8689 | DECL_FIELD_OFFSET (new_field) = variable_size (pos); | |
95c1c4bb EB |
8690 | DECL_FIELD_BIT_OFFSET (new_field) = bitpos; |
8691 | SET_DECL_OFFSET_ALIGN (new_field, offset_align); | |
8692 | DECL_SIZE (new_field) = size; | |
8693 | DECL_SIZE_UNIT (new_field) | |
8694 | = convert (sizetype, | |
8695 | size_binop (CEIL_DIV_EXPR, size, bitsize_unit_node)); | |
8696 | layout_decl (new_field, DECL_OFFSET_ALIGN (new_field)); | |
8697 | } | |
8698 | ||
8699 | DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field); | |
cb3d597d | 8700 | SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, old_field); |
95c1c4bb EB |
8701 | DECL_DISCRIMINANT_NUMBER (new_field) = DECL_DISCRIMINANT_NUMBER (old_field); |
8702 | TREE_THIS_VOLATILE (new_field) = TREE_THIS_VOLATILE (old_field); | |
8703 | ||
8704 | return new_field; | |
8705 | } | |
8706 | ||
b1a785fb EB |
8707 | /* Create the REP part of RECORD_TYPE with REP_TYPE. If MIN_SIZE is nonzero, |
8708 | it is the minimal size the REP_PART must have. */ | |
8709 | ||
8710 | static tree | |
8711 | create_rep_part (tree rep_type, tree record_type, tree min_size) | |
8712 | { | |
8713 | tree field; | |
8714 | ||
8715 | if (min_size && !tree_int_cst_lt (TYPE_SIZE (rep_type), min_size)) | |
8716 | min_size = NULL_TREE; | |
8717 | ||
8718 | field = create_field_decl (get_identifier ("REP"), rep_type, record_type, | |
9580628d | 8719 | min_size, NULL_TREE, 0, 1); |
b1a785fb EB |
8720 | DECL_INTERNAL_P (field) = 1; |
8721 | ||
8722 | return field; | |
8723 | } | |
8724 | ||
95c1c4bb EB |
8725 | /* Return the REP part of RECORD_TYPE, if any. Otherwise return NULL. */ |
8726 | ||
8727 | static tree | |
8728 | get_rep_part (tree record_type) | |
8729 | { | |
8730 | tree field = TYPE_FIELDS (record_type); | |
8731 | ||
8732 | /* The REP part is the first field, internal, another record, and its name | |
b1a785fb | 8733 | starts with an 'R'. */ |
638eeae8 EB |
8734 | if (field |
8735 | && DECL_INTERNAL_P (field) | |
95c1c4bb | 8736 | && TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE |
b1a785fb | 8737 | && IDENTIFIER_POINTER (DECL_NAME (field)) [0] == 'R') |
95c1c4bb EB |
8738 | return field; |
8739 | ||
8740 | return NULL_TREE; | |
8741 | } | |
8742 | ||
8743 | /* Return the variant part of RECORD_TYPE, if any. Otherwise return NULL. */ | |
8744 | ||
805e60a0 | 8745 | tree |
95c1c4bb EB |
8746 | get_variant_part (tree record_type) |
8747 | { | |
8748 | tree field; | |
8749 | ||
8750 | /* The variant part is the only internal field that is a qualified union. */ | |
910ad8de | 8751 | for (field = TYPE_FIELDS (record_type); field; field = DECL_CHAIN (field)) |
95c1c4bb EB |
8752 | if (DECL_INTERNAL_P (field) |
8753 | && TREE_CODE (TREE_TYPE (field)) == QUAL_UNION_TYPE) | |
8754 | return field; | |
8755 | ||
8756 | return NULL_TREE; | |
8757 | } | |
8758 | ||
8759 | /* Return a new variant part modeled on OLD_VARIANT_PART. VARIANT_LIST is | |
8760 | the list of variants to be used and RECORD_TYPE is the type of the parent. | |
8761 | POS_LIST is a position list describing the layout of fields present in | |
8762 | OLD_VARIANT_PART and SUBST_LIST a substitution list to be applied to this | |
8763 | layout. */ | |
8764 | ||
8765 | static tree | |
fb7fb701 | 8766 | create_variant_part_from (tree old_variant_part, |
9771b263 | 8767 | vec<variant_desc> variant_list, |
e3554601 | 8768 | tree record_type, tree pos_list, |
9771b263 | 8769 | vec<subst_pair> subst_list) |
95c1c4bb EB |
8770 | { |
8771 | tree offset = DECL_FIELD_OFFSET (old_variant_part); | |
95c1c4bb | 8772 | tree old_union_type = TREE_TYPE (old_variant_part); |
fb7fb701 | 8773 | tree new_union_type, new_variant_part; |
95c1c4bb | 8774 | tree union_field_list = NULL_TREE; |
fb7fb701 | 8775 | variant_desc *v; |
f54ee980 | 8776 | unsigned int i; |
95c1c4bb EB |
8777 | |
8778 | /* First create the type of the variant part from that of the old one. */ | |
8779 | new_union_type = make_node (QUAL_UNION_TYPE); | |
82ea8185 EB |
8780 | TYPE_NAME (new_union_type) |
8781 | = concat_name (TYPE_NAME (record_type), | |
8782 | IDENTIFIER_POINTER (DECL_NAME (old_variant_part))); | |
95c1c4bb EB |
8783 | |
8784 | /* If the position of the variant part is constant, subtract it from the | |
8785 | size of the type of the parent to get the new size. This manual CSE | |
8786 | reduces the code size when not optimizing. */ | |
da01bfee | 8787 | if (TREE_CODE (offset) == INTEGER_CST) |
95c1c4bb | 8788 | { |
da01bfee | 8789 | tree bitpos = DECL_FIELD_BIT_OFFSET (old_variant_part); |
95c1c4bb EB |
8790 | tree first_bit = bit_from_pos (offset, bitpos); |
8791 | TYPE_SIZE (new_union_type) | |
8792 | = size_binop (MINUS_EXPR, TYPE_SIZE (record_type), first_bit); | |
8793 | TYPE_SIZE_UNIT (new_union_type) | |
8794 | = size_binop (MINUS_EXPR, TYPE_SIZE_UNIT (record_type), | |
8795 | byte_from_pos (offset, bitpos)); | |
8796 | SET_TYPE_ADA_SIZE (new_union_type, | |
8797 | size_binop (MINUS_EXPR, TYPE_ADA_SIZE (record_type), | |
8798 | first_bit)); | |
fe37c7af | 8799 | SET_TYPE_ALIGN (new_union_type, TYPE_ALIGN (old_union_type)); |
95c1c4bb EB |
8800 | relate_alias_sets (new_union_type, old_union_type, ALIAS_SET_COPY); |
8801 | } | |
8802 | else | |
8803 | copy_and_substitute_in_size (new_union_type, old_union_type, subst_list); | |
8804 | ||
8805 | /* Now finish up the new variants and populate the union type. */ | |
9771b263 | 8806 | FOR_EACH_VEC_ELT_REVERSE (variant_list, i, v) |
95c1c4bb | 8807 | { |
fb7fb701 | 8808 | tree old_field = v->field, new_field; |
95c1c4bb EB |
8809 | tree old_variant, old_variant_subpart, new_variant, field_list; |
8810 | ||
8811 | /* Skip variants that don't belong to this nesting level. */ | |
8812 | if (DECL_CONTEXT (old_field) != old_union_type) | |
8813 | continue; | |
8814 | ||
8815 | /* Retrieve the list of fields already added to the new variant. */ | |
82ea8185 | 8816 | new_variant = v->new_type; |
95c1c4bb EB |
8817 | field_list = TYPE_FIELDS (new_variant); |
8818 | ||
8819 | /* If the old variant had a variant subpart, we need to create a new | |
8820 | variant subpart and add it to the field list. */ | |
fb7fb701 | 8821 | old_variant = v->type; |
95c1c4bb EB |
8822 | old_variant_subpart = get_variant_part (old_variant); |
8823 | if (old_variant_subpart) | |
8824 | { | |
8825 | tree new_variant_subpart | |
8826 | = create_variant_part_from (old_variant_subpart, variant_list, | |
8827 | new_variant, pos_list, subst_list); | |
910ad8de | 8828 | DECL_CHAIN (new_variant_subpart) = field_list; |
95c1c4bb EB |
8829 | field_list = new_variant_subpart; |
8830 | } | |
8831 | ||
032d1b71 EB |
8832 | /* Finish up the new variant and create the field. No need for debug |
8833 | info thanks to the XVS type. */ | |
8834 | finish_record_type (new_variant, nreverse (field_list), 2, false); | |
95c1c4bb | 8835 | compute_record_mode (new_variant); |
74746d49 EB |
8836 | create_type_decl (TYPE_NAME (new_variant), new_variant, true, false, |
8837 | Empty); | |
95c1c4bb EB |
8838 | |
8839 | new_field | |
8840 | = create_field_decl_from (old_field, new_variant, new_union_type, | |
8841 | TYPE_SIZE (new_variant), | |
8842 | pos_list, subst_list); | |
fb7fb701 | 8843 | DECL_QUALIFIER (new_field) = v->qual; |
95c1c4bb | 8844 | DECL_INTERNAL_P (new_field) = 1; |
910ad8de | 8845 | DECL_CHAIN (new_field) = union_field_list; |
95c1c4bb EB |
8846 | union_field_list = new_field; |
8847 | } | |
8848 | ||
032d1b71 | 8849 | /* Finish up the union type and create the variant part. No need for debug |
f54ee980 EB |
8850 | info thanks to the XVS type. Note that we don't reverse the field list |
8851 | because VARIANT_LIST has been traversed in reverse order. */ | |
032d1b71 | 8852 | finish_record_type (new_union_type, union_field_list, 2, false); |
95c1c4bb | 8853 | compute_record_mode (new_union_type); |
74746d49 EB |
8854 | create_type_decl (TYPE_NAME (new_union_type), new_union_type, true, false, |
8855 | Empty); | |
95c1c4bb EB |
8856 | |
8857 | new_variant_part | |
8858 | = create_field_decl_from (old_variant_part, new_union_type, record_type, | |
8859 | TYPE_SIZE (new_union_type), | |
8860 | pos_list, subst_list); | |
8861 | DECL_INTERNAL_P (new_variant_part) = 1; | |
8862 | ||
8863 | /* With multiple discriminants it is possible for an inner variant to be | |
8864 | statically selected while outer ones are not; in this case, the list | |
8865 | of fields of the inner variant is not flattened and we end up with a | |
8866 | qualified union with a single member. Drop the useless container. */ | |
910ad8de | 8867 | if (!DECL_CHAIN (union_field_list)) |
95c1c4bb EB |
8868 | { |
8869 | DECL_CONTEXT (union_field_list) = record_type; | |
8870 | DECL_FIELD_OFFSET (union_field_list) | |
8871 | = DECL_FIELD_OFFSET (new_variant_part); | |
8872 | DECL_FIELD_BIT_OFFSET (union_field_list) | |
8873 | = DECL_FIELD_BIT_OFFSET (new_variant_part); | |
8874 | SET_DECL_OFFSET_ALIGN (union_field_list, | |
8875 | DECL_OFFSET_ALIGN (new_variant_part)); | |
8876 | new_variant_part = union_field_list; | |
8877 | } | |
8878 | ||
8879 | return new_variant_part; | |
8880 | } | |
8881 | ||
8882 | /* Copy the size (and alignment and alias set) from OLD_TYPE to NEW_TYPE, | |
8883 | which are both RECORD_TYPE, after applying the substitutions described | |
8884 | in SUBST_LIST. */ | |
8885 | ||
8886 | static void | |
e3554601 | 8887 | copy_and_substitute_in_size (tree new_type, tree old_type, |
9771b263 | 8888 | vec<subst_pair> subst_list) |
95c1c4bb | 8889 | { |
f54ee980 | 8890 | unsigned int i; |
e3554601 | 8891 | subst_pair *s; |
95c1c4bb EB |
8892 | |
8893 | TYPE_SIZE (new_type) = TYPE_SIZE (old_type); | |
8894 | TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (old_type); | |
8895 | SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (old_type)); | |
fe37c7af | 8896 | SET_TYPE_ALIGN (new_type, TYPE_ALIGN (old_type)); |
95c1c4bb EB |
8897 | relate_alias_sets (new_type, old_type, ALIAS_SET_COPY); |
8898 | ||
8899 | if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (new_type))) | |
9771b263 | 8900 | FOR_EACH_VEC_ELT (subst_list, i, s) |
95c1c4bb EB |
8901 | TYPE_SIZE (new_type) |
8902 | = SUBSTITUTE_IN_EXPR (TYPE_SIZE (new_type), | |
e3554601 | 8903 | s->discriminant, s->replacement); |
95c1c4bb EB |
8904 | |
8905 | if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (new_type))) | |
9771b263 | 8906 | FOR_EACH_VEC_ELT (subst_list, i, s) |
95c1c4bb EB |
8907 | TYPE_SIZE_UNIT (new_type) |
8908 | = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (new_type), | |
e3554601 | 8909 | s->discriminant, s->replacement); |
95c1c4bb EB |
8910 | |
8911 | if (CONTAINS_PLACEHOLDER_P (TYPE_ADA_SIZE (new_type))) | |
9771b263 | 8912 | FOR_EACH_VEC_ELT (subst_list, i, s) |
95c1c4bb EB |
8913 | SET_TYPE_ADA_SIZE |
8914 | (new_type, SUBSTITUTE_IN_EXPR (TYPE_ADA_SIZE (new_type), | |
e3554601 | 8915 | s->discriminant, s->replacement)); |
95c1c4bb EB |
8916 | |
8917 | /* Finalize the size. */ | |
8918 | TYPE_SIZE (new_type) = variable_size (TYPE_SIZE (new_type)); | |
8919 | TYPE_SIZE_UNIT (new_type) = variable_size (TYPE_SIZE_UNIT (new_type)); | |
8920 | } | |
1eb58520 | 8921 | |
2d595887 PMR |
8922 | /* Associate to GNU_TYPE, the translation of GNAT_ENTITY, which is |
8923 | the implementation type of a packed array type (Is_Packed_Array_Impl_Type), | |
8924 | the original array type if it has been translated. This association is a | |
8925 | parallel type for GNAT encodings or a debug type for standard DWARF. Note | |
8926 | that for standard DWARF, we also want to get the original type name. */ | |
1eb58520 AC |
8927 | |
8928 | static void | |
2d595887 | 8929 | associate_original_type_to_packed_array (tree gnu_type, Entity_Id gnat_entity) |
1eb58520 AC |
8930 | { |
8931 | Entity_Id gnat_original_array_type | |
8932 | = Underlying_Type (Original_Array_Type (gnat_entity)); | |
8933 | tree gnu_original_array_type; | |
8934 | ||
8935 | if (!present_gnu_tree (gnat_original_array_type)) | |
8936 | return; | |
8937 | ||
8938 | gnu_original_array_type = gnat_to_gnu_type (gnat_original_array_type); | |
8939 | ||
8940 | if (TYPE_IS_DUMMY_P (gnu_original_array_type)) | |
8941 | return; | |
8942 | ||
2d595887 PMR |
8943 | if (gnat_encodings == DWARF_GNAT_ENCODINGS_MINIMAL) |
8944 | { | |
8945 | tree original_name = TYPE_NAME (gnu_original_array_type); | |
8946 | ||
8947 | if (TREE_CODE (original_name) == TYPE_DECL) | |
8948 | original_name = DECL_NAME (original_name); | |
8949 | ||
8950 | SET_TYPE_ORIGINAL_PACKED_ARRAY (gnu_type, gnu_original_array_type); | |
8951 | TYPE_NAME (gnu_type) = original_name; | |
8952 | } | |
8953 | else | |
8954 | add_parallel_type (gnu_type, gnu_original_array_type); | |
1eb58520 | 8955 | } |
95c1c4bb | 8956 | \f |
77022fa8 EB |
8957 | /* Given a type T, a FIELD_DECL F, and a replacement value R, return a |
8958 | type with all size expressions that contain F in a PLACEHOLDER_EXPR | |
8959 | updated by replacing F with R. | |
8960 | ||
8961 | The function doesn't update the layout of the type, i.e. it assumes | |
8962 | that the substitution is purely formal. That's why the replacement | |
8963 | value R must itself contain a PLACEHOLDER_EXPR. */ | |
a1ab4c31 AC |
8964 | |
8965 | tree | |
8966 | substitute_in_type (tree t, tree f, tree r) | |
8967 | { | |
c6bd4220 | 8968 | tree nt; |
77022fa8 EB |
8969 | |
8970 | gcc_assert (CONTAINS_PLACEHOLDER_P (r)); | |
a1ab4c31 AC |
8971 | |
8972 | switch (TREE_CODE (t)) | |
8973 | { | |
8974 | case INTEGER_TYPE: | |
8975 | case ENUMERAL_TYPE: | |
8976 | case BOOLEAN_TYPE: | |
a531043b | 8977 | case REAL_TYPE: |
84fb43a1 EB |
8978 | |
8979 | /* First the domain types of arrays. */ | |
8980 | if (CONTAINS_PLACEHOLDER_P (TYPE_GCC_MIN_VALUE (t)) | |
8981 | || CONTAINS_PLACEHOLDER_P (TYPE_GCC_MAX_VALUE (t))) | |
a1ab4c31 | 8982 | { |
84fb43a1 EB |
8983 | tree low = SUBSTITUTE_IN_EXPR (TYPE_GCC_MIN_VALUE (t), f, r); |
8984 | tree high = SUBSTITUTE_IN_EXPR (TYPE_GCC_MAX_VALUE (t), f, r); | |
a1ab4c31 | 8985 | |
84fb43a1 | 8986 | if (low == TYPE_GCC_MIN_VALUE (t) && high == TYPE_GCC_MAX_VALUE (t)) |
a1ab4c31 AC |
8987 | return t; |
8988 | ||
c6bd4220 EB |
8989 | nt = copy_type (t); |
8990 | TYPE_GCC_MIN_VALUE (nt) = low; | |
8991 | TYPE_GCC_MAX_VALUE (nt) = high; | |
a531043b EB |
8992 | |
8993 | if (TREE_CODE (t) == INTEGER_TYPE && TYPE_INDEX_TYPE (t)) | |
a1ab4c31 | 8994 | SET_TYPE_INDEX_TYPE |
c6bd4220 | 8995 | (nt, substitute_in_type (TYPE_INDEX_TYPE (t), f, r)); |
a1ab4c31 | 8996 | |
c6bd4220 | 8997 | return nt; |
a1ab4c31 | 8998 | } |
77022fa8 | 8999 | |
84fb43a1 EB |
9000 | /* Then the subtypes. */ |
9001 | if (CONTAINS_PLACEHOLDER_P (TYPE_RM_MIN_VALUE (t)) | |
9002 | || CONTAINS_PLACEHOLDER_P (TYPE_RM_MAX_VALUE (t))) | |
9003 | { | |
9004 | tree low = SUBSTITUTE_IN_EXPR (TYPE_RM_MIN_VALUE (t), f, r); | |
9005 | tree high = SUBSTITUTE_IN_EXPR (TYPE_RM_MAX_VALUE (t), f, r); | |
9006 | ||
9007 | if (low == TYPE_RM_MIN_VALUE (t) && high == TYPE_RM_MAX_VALUE (t)) | |
9008 | return t; | |
9009 | ||
c6bd4220 EB |
9010 | nt = copy_type (t); |
9011 | SET_TYPE_RM_MIN_VALUE (nt, low); | |
9012 | SET_TYPE_RM_MAX_VALUE (nt, high); | |
84fb43a1 | 9013 | |
c6bd4220 | 9014 | return nt; |
84fb43a1 EB |
9015 | } |
9016 | ||
a1ab4c31 AC |
9017 | return t; |
9018 | ||
9019 | case COMPLEX_TYPE: | |
c6bd4220 EB |
9020 | nt = substitute_in_type (TREE_TYPE (t), f, r); |
9021 | if (nt == TREE_TYPE (t)) | |
a1ab4c31 AC |
9022 | return t; |
9023 | ||
c6bd4220 | 9024 | return build_complex_type (nt); |
a1ab4c31 | 9025 | |
a1ab4c31 | 9026 | case FUNCTION_TYPE: |
77022fa8 | 9027 | /* These should never show up here. */ |
a1ab4c31 AC |
9028 | gcc_unreachable (); |
9029 | ||
9030 | case ARRAY_TYPE: | |
9031 | { | |
9032 | tree component = substitute_in_type (TREE_TYPE (t), f, r); | |
9033 | tree domain = substitute_in_type (TYPE_DOMAIN (t), f, r); | |
9034 | ||
9035 | if (component == TREE_TYPE (t) && domain == TYPE_DOMAIN (t)) | |
9036 | return t; | |
9037 | ||
523e82a7 | 9038 | nt = build_nonshared_array_type (component, domain); |
fe37c7af | 9039 | SET_TYPE_ALIGN (nt, TYPE_ALIGN (t)); |
c6bd4220 EB |
9040 | TYPE_USER_ALIGN (nt) = TYPE_USER_ALIGN (t); |
9041 | SET_TYPE_MODE (nt, TYPE_MODE (t)); | |
9042 | TYPE_SIZE (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r); | |
9043 | TYPE_SIZE_UNIT (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r); | |
9044 | TYPE_NONALIASED_COMPONENT (nt) = TYPE_NONALIASED_COMPONENT (t); | |
9045 | TYPE_MULTI_ARRAY_P (nt) = TYPE_MULTI_ARRAY_P (t); | |
9046 | TYPE_CONVENTION_FORTRAN_P (nt) = TYPE_CONVENTION_FORTRAN_P (t); | |
9047 | return nt; | |
a1ab4c31 AC |
9048 | } |
9049 | ||
9050 | case RECORD_TYPE: | |
9051 | case UNION_TYPE: | |
9052 | case QUAL_UNION_TYPE: | |
9053 | { | |
77022fa8 | 9054 | bool changed_field = false; |
a1ab4c31 | 9055 | tree field; |
a1ab4c31 AC |
9056 | |
9057 | /* Start out with no fields, make new fields, and chain them | |
9058 | in. If we haven't actually changed the type of any field, | |
9059 | discard everything we've done and return the old type. */ | |
c6bd4220 EB |
9060 | nt = copy_type (t); |
9061 | TYPE_FIELDS (nt) = NULL_TREE; | |
a1ab4c31 | 9062 | |
910ad8de | 9063 | for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field)) |
a1ab4c31 | 9064 | { |
77022fa8 EB |
9065 | tree new_field = copy_node (field), new_n; |
9066 | ||
9067 | new_n = substitute_in_type (TREE_TYPE (field), f, r); | |
9068 | if (new_n != TREE_TYPE (field)) | |
a1ab4c31 | 9069 | { |
77022fa8 EB |
9070 | TREE_TYPE (new_field) = new_n; |
9071 | changed_field = true; | |
9072 | } | |
a1ab4c31 | 9073 | |
77022fa8 EB |
9074 | new_n = SUBSTITUTE_IN_EXPR (DECL_FIELD_OFFSET (field), f, r); |
9075 | if (new_n != DECL_FIELD_OFFSET (field)) | |
9076 | { | |
9077 | DECL_FIELD_OFFSET (new_field) = new_n; | |
9078 | changed_field = true; | |
9079 | } | |
a1ab4c31 | 9080 | |
77022fa8 EB |
9081 | /* Do the substitution inside the qualifier, if any. */ |
9082 | if (TREE_CODE (t) == QUAL_UNION_TYPE) | |
9083 | { | |
9084 | new_n = SUBSTITUTE_IN_EXPR (DECL_QUALIFIER (field), f, r); | |
9085 | if (new_n != DECL_QUALIFIER (field)) | |
9086 | { | |
9087 | DECL_QUALIFIER (new_field) = new_n; | |
9088 | changed_field = true; | |
a1ab4c31 AC |
9089 | } |
9090 | } | |
9091 | ||
c6bd4220 | 9092 | DECL_CONTEXT (new_field) = nt; |
cb3d597d | 9093 | SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, field); |
a1ab4c31 | 9094 | |
910ad8de | 9095 | DECL_CHAIN (new_field) = TYPE_FIELDS (nt); |
c6bd4220 | 9096 | TYPE_FIELDS (nt) = new_field; |
a1ab4c31 AC |
9097 | } |
9098 | ||
77022fa8 | 9099 | if (!changed_field) |
a1ab4c31 AC |
9100 | return t; |
9101 | ||
c6bd4220 EB |
9102 | TYPE_FIELDS (nt) = nreverse (TYPE_FIELDS (nt)); |
9103 | TYPE_SIZE (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r); | |
9104 | TYPE_SIZE_UNIT (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r); | |
9105 | SET_TYPE_ADA_SIZE (nt, SUBSTITUTE_IN_EXPR (TYPE_ADA_SIZE (t), f, r)); | |
9106 | return nt; | |
a1ab4c31 AC |
9107 | } |
9108 | ||
9109 | default: | |
9110 | return t; | |
9111 | } | |
9112 | } | |
9113 | \f | |
b4680ca1 | 9114 | /* Return the RM size of GNU_TYPE. This is the actual number of bits |
a1ab4c31 AC |
9115 | needed to represent the object. */ |
9116 | ||
9117 | tree | |
9118 | rm_size (tree gnu_type) | |
9119 | { | |
e6e15ec9 | 9120 | /* For integral types, we store the RM size explicitly. */ |
a1ab4c31 AC |
9121 | if (INTEGRAL_TYPE_P (gnu_type) && TYPE_RM_SIZE (gnu_type)) |
9122 | return TYPE_RM_SIZE (gnu_type); | |
b4680ca1 EB |
9123 | |
9124 | /* Return the RM size of the actual data plus the size of the template. */ | |
9125 | if (TREE_CODE (gnu_type) == RECORD_TYPE | |
9126 | && TYPE_CONTAINS_TEMPLATE_P (gnu_type)) | |
a1ab4c31 AC |
9127 | return |
9128 | size_binop (PLUS_EXPR, | |
910ad8de | 9129 | rm_size (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (gnu_type)))), |
a1ab4c31 | 9130 | DECL_SIZE (TYPE_FIELDS (gnu_type))); |
b4680ca1 | 9131 | |
e1e5852c EB |
9132 | /* For record or union types, we store the size explicitly. */ |
9133 | if (RECORD_OR_UNION_TYPE_P (gnu_type) | |
315cff15 | 9134 | && !TYPE_FAT_POINTER_P (gnu_type) |
b4680ca1 | 9135 | && TYPE_ADA_SIZE (gnu_type)) |
a1ab4c31 | 9136 | return TYPE_ADA_SIZE (gnu_type); |
b4680ca1 EB |
9137 | |
9138 | /* For other types, this is just the size. */ | |
9139 | return TYPE_SIZE (gnu_type); | |
a1ab4c31 AC |
9140 | } |
9141 | \f | |
0fb2335d EB |
9142 | /* Return the name to be used for GNAT_ENTITY. If a type, create a |
9143 | fully-qualified name, possibly with type information encoding. | |
9144 | Otherwise, return the name. */ | |
9145 | ||
bf44701f EB |
9146 | static const char * |
9147 | get_entity_char (Entity_Id gnat_entity) | |
9148 | { | |
9149 | Get_Encoded_Name (gnat_entity); | |
9150 | return ggc_strdup (Name_Buffer); | |
9151 | } | |
9152 | ||
0fb2335d EB |
9153 | tree |
9154 | get_entity_name (Entity_Id gnat_entity) | |
9155 | { | |
9156 | Get_Encoded_Name (gnat_entity); | |
9157 | return get_identifier_with_length (Name_Buffer, Name_Len); | |
9158 | } | |
9159 | ||
a1ab4c31 AC |
9160 | /* Return an identifier representing the external name to be used for |
9161 | GNAT_ENTITY. If SUFFIX is specified, the name is followed by "___" | |
9162 | and the specified suffix. */ | |
9163 | ||
9164 | tree | |
9165 | create_concat_name (Entity_Id gnat_entity, const char *suffix) | |
9166 | { | |
93582885 EB |
9167 | const Entity_Kind kind = Ekind (gnat_entity); |
9168 | const bool has_suffix = (suffix != NULL); | |
9169 | String_Template temp = {1, has_suffix ? strlen (suffix) : 0}; | |
9170 | String_Pointer sp = {suffix, &temp}; | |
a1ab4c31 | 9171 | |
93582885 | 9172 | Get_External_Name (gnat_entity, has_suffix, sp); |
a1ab4c31 | 9173 | |
0fb2335d EB |
9174 | /* A variable using the Stdcall convention lives in a DLL. We adjust |
9175 | its name to use the jump table, the _imp__NAME contains the address | |
9176 | for the NAME variable. */ | |
a1ab4c31 AC |
9177 | if ((kind == E_Variable || kind == E_Constant) |
9178 | && Has_Stdcall_Convention (gnat_entity)) | |
9179 | { | |
93582885 | 9180 | const int len = strlen (STDCALL_PREFIX) + Name_Len; |
0fb2335d | 9181 | char *new_name = (char *) alloca (len + 1); |
93582885 | 9182 | strcpy (new_name, STDCALL_PREFIX); |
0fb2335d EB |
9183 | strcat (new_name, Name_Buffer); |
9184 | return get_identifier_with_length (new_name, len); | |
a1ab4c31 AC |
9185 | } |
9186 | ||
0fb2335d | 9187 | return get_identifier_with_length (Name_Buffer, Name_Len); |
a1ab4c31 AC |
9188 | } |
9189 | ||
0fb2335d | 9190 | /* Given GNU_NAME, an IDENTIFIER_NODE containing a name and SUFFIX, a |
a1ab4c31 | 9191 | string, return a new IDENTIFIER_NODE that is the concatenation of |
0fb2335d | 9192 | the name followed by "___" and the specified suffix. */ |
a1ab4c31 AC |
9193 | |
9194 | tree | |
0fb2335d | 9195 | concat_name (tree gnu_name, const char *suffix) |
a1ab4c31 | 9196 | { |
0fb2335d EB |
9197 | const int len = IDENTIFIER_LENGTH (gnu_name) + 3 + strlen (suffix); |
9198 | char *new_name = (char *) alloca (len + 1); | |
9199 | strcpy (new_name, IDENTIFIER_POINTER (gnu_name)); | |
9200 | strcat (new_name, "___"); | |
9201 | strcat (new_name, suffix); | |
9202 | return get_identifier_with_length (new_name, len); | |
a1ab4c31 AC |
9203 | } |
9204 | ||
4116e7d0 EB |
9205 | /* Initialize data structures of the decl.c module. */ |
9206 | ||
9207 | void | |
9208 | init_gnat_decl (void) | |
9209 | { | |
9210 | /* Initialize the cache of annotated values. */ | |
d242408f | 9211 | annotate_value_cache = hash_table<value_annotation_hasher>::create_ggc (512); |
4116e7d0 EB |
9212 | } |
9213 | ||
9214 | /* Destroy data structures of the decl.c module. */ | |
9215 | ||
9216 | void | |
9217 | destroy_gnat_decl (void) | |
9218 | { | |
9219 | /* Destroy the cache of annotated values. */ | |
d242408f | 9220 | annotate_value_cache->empty (); |
4116e7d0 EB |
9221 | annotate_value_cache = NULL; |
9222 | } | |
9223 | ||
a1ab4c31 | 9224 | #include "gt-ada-decl.h" |