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a1ab4c31 AC |
1 | /**************************************************************************** |
2 | * * | |
3 | * GNAT COMPILER COMPONENTS * | |
4 | * * | |
5 | * D E C L * | |
6 | * * | |
7 | * C Implementation File * | |
8 | * * | |
c6eecbd8 | 9 | * Copyright (C) 1992-2011, 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" | |
29 | #include "tm.h" | |
30 | #include "tree.h" | |
31 | #include "flags.h" | |
32 | #include "toplev.h" | |
a1ab4c31 | 33 | #include "ggc.h" |
a1ab4c31 | 34 | #include "target.h" |
f82a627c | 35 | #include "tree-inline.h" |
a1ab4c31 AC |
36 | |
37 | #include "ada.h" | |
38 | #include "types.h" | |
39 | #include "atree.h" | |
40 | #include "elists.h" | |
41 | #include "namet.h" | |
42 | #include "nlists.h" | |
43 | #include "repinfo.h" | |
44 | #include "snames.h" | |
45 | #include "stringt.h" | |
46 | #include "uintp.h" | |
47 | #include "fe.h" | |
48 | #include "sinfo.h" | |
49 | #include "einfo.h" | |
a1ab4c31 AC |
50 | #include "ada-tree.h" |
51 | #include "gigi.h" | |
52 | ||
c6eecbd8 PO |
53 | /* Convention_Stdcall should be processed in a specific way on 32 bits |
54 | Windows targets only. The macro below is a helper to avoid having to | |
55 | check for a Windows specific attribute throughout this unit. */ | |
a1ab4c31 AC |
56 | |
57 | #if TARGET_DLLIMPORT_DECL_ATTRIBUTES | |
c6eecbd8 PO |
58 | #ifdef TARGET_64BIT |
59 | #define Has_Stdcall_Convention(E) \ | |
60 | (!TARGET_64BIT && Convention (E) == Convention_Stdcall) | |
61 | #else | |
a1ab4c31 | 62 | #define Has_Stdcall_Convention(E) (Convention (E) == Convention_Stdcall) |
c6eecbd8 | 63 | #endif |
a1ab4c31 | 64 | #else |
c6eecbd8 | 65 | #define Has_Stdcall_Convention(E) 0 |
a1ab4c31 AC |
66 | #endif |
67 | ||
66194a98 OH |
68 | /* Stack realignment is necessary for functions with foreign conventions when |
69 | the ABI doesn't mandate as much as what the compiler assumes - that is, up | |
70 | to PREFERRED_STACK_BOUNDARY. | |
71 | ||
72 | Such realignment can be requested with a dedicated function type attribute | |
73 | on the targets that support it. We define FOREIGN_FORCE_REALIGN_STACK to | |
74 | characterize the situations where the attribute should be set. We rely on | |
75 | compiler configuration settings for 'main' to decide. */ | |
76 | ||
77 | #ifdef MAIN_STACK_BOUNDARY | |
78 | #define FOREIGN_FORCE_REALIGN_STACK \ | |
79 | (MAIN_STACK_BOUNDARY < PREFERRED_STACK_BOUNDARY) | |
80 | #else | |
81 | #define FOREIGN_FORCE_REALIGN_STACK 0 | |
a1ab4c31 AC |
82 | #endif |
83 | ||
84 | struct incomplete | |
85 | { | |
86 | struct incomplete *next; | |
87 | tree old_type; | |
88 | Entity_Id full_type; | |
89 | }; | |
90 | ||
91 | /* These variables are used to defer recursively expanding incomplete types | |
92 | while we are processing an array, a record or a subprogram type. */ | |
93 | static int defer_incomplete_level = 0; | |
94 | static struct incomplete *defer_incomplete_list; | |
95 | ||
96 | /* This variable is used to delay expanding From_With_Type types until the | |
97 | end of the spec. */ | |
98 | static struct incomplete *defer_limited_with; | |
99 | ||
100 | /* These variables are used to defer finalizing types. The element of the | |
101 | list is the TYPE_DECL associated with the type. */ | |
102 | static int defer_finalize_level = 0; | |
103 | static VEC (tree,heap) *defer_finalize_list; | |
104 | ||
1aa67003 | 105 | typedef struct subst_pair_d { |
e3554601 NF |
106 | tree discriminant; |
107 | tree replacement; | |
108 | } subst_pair; | |
109 | ||
110 | DEF_VEC_O(subst_pair); | |
111 | DEF_VEC_ALLOC_O(subst_pair,heap); | |
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 | ||
123 | /* The record associated with this variant. */ | |
124 | tree record; | |
125 | } variant_desc; | |
126 | ||
127 | DEF_VEC_O(variant_desc); | |
128 | DEF_VEC_ALLOC_O(variant_desc,heap); | |
129 | ||
a1ab4c31 AC |
130 | /* A hash table used to cache the result of annotate_value. */ |
131 | static GTY ((if_marked ("tree_int_map_marked_p"), | |
132 | param_is (struct tree_int_map))) htab_t annotate_value_cache; | |
133 | ||
794511d2 EB |
134 | enum alias_set_op |
135 | { | |
136 | ALIAS_SET_COPY, | |
137 | ALIAS_SET_SUBSET, | |
138 | ALIAS_SET_SUPERSET | |
139 | }; | |
140 | ||
141 | static void relate_alias_sets (tree, tree, enum alias_set_op); | |
142 | ||
a1ab4c31 AC |
143 | static bool allocatable_size_p (tree, bool); |
144 | static void prepend_one_attribute_to (struct attrib **, | |
145 | enum attr_type, tree, tree, Node_Id); | |
146 | static void prepend_attributes (Entity_Id, struct attrib **); | |
147 | static tree elaborate_expression (Node_Id, Entity_Id, tree, bool, bool, bool); | |
148 | static bool is_variable_size (tree); | |
a531043b | 149 | static tree elaborate_expression_1 (tree, Entity_Id, tree, bool, bool); |
da01bfee EB |
150 | static tree elaborate_expression_2 (tree, Entity_Id, tree, bool, bool, |
151 | unsigned int); | |
a1ab4c31 | 152 | static tree make_packable_type (tree, bool); |
2cac6017 | 153 | static tree gnat_to_gnu_component_type (Entity_Id, bool, bool); |
a1ab4c31 AC |
154 | static tree gnat_to_gnu_param (Entity_Id, Mechanism_Type, Entity_Id, bool, |
155 | bool *); | |
2cac6017 | 156 | static tree gnat_to_gnu_field (Entity_Id, tree, int, bool, bool); |
a1ab4c31 | 157 | static bool same_discriminant_p (Entity_Id, Entity_Id); |
d8e94f79 | 158 | static bool array_type_has_nonaliased_component (tree, Entity_Id); |
229077b0 | 159 | static bool compile_time_known_address_p (Node_Id); |
f45f9664 | 160 | static bool cannot_be_superflat_p (Node_Id); |
cb3d597d | 161 | static bool constructor_address_p (tree); |
ef0feeb2 EB |
162 | static void components_to_record (tree, Node_Id, tree, int, bool, bool, bool, |
163 | bool, bool, bool, bool, tree *); | |
a1ab4c31 AC |
164 | static Uint annotate_value (tree); |
165 | static void annotate_rep (Entity_Id, tree); | |
95c1c4bb | 166 | static tree build_position_list (tree, bool, tree, tree, unsigned int, tree); |
e3554601 | 167 | static VEC(subst_pair,heap) *build_subst_list (Entity_Id, Entity_Id, bool); |
fb7fb701 NF |
168 | static VEC(variant_desc,heap) *build_variant_list (tree, |
169 | VEC(subst_pair,heap) *, | |
170 | VEC(variant_desc,heap) *); | |
a1ab4c31 AC |
171 | static tree validate_size (Uint, tree, Entity_Id, enum tree_code, bool, bool); |
172 | static void set_rm_size (Uint, tree, Entity_Id); | |
173 | static tree make_type_from_size (tree, tree, bool); | |
174 | static unsigned int validate_alignment (Uint, Entity_Id, unsigned int); | |
175 | static unsigned int ceil_alignment (unsigned HOST_WIDE_INT); | |
176 | static void check_ok_for_atomic (tree, Entity_Id, bool); | |
e3554601 NF |
177 | static tree create_field_decl_from (tree, tree, tree, tree, tree, |
178 | VEC(subst_pair,heap) *); | |
95c1c4bb | 179 | static tree get_rep_part (tree); |
fb7fb701 NF |
180 | static tree create_variant_part_from (tree, VEC(variant_desc,heap) *, tree, |
181 | tree, VEC(subst_pair,heap) *); | |
e3554601 | 182 | static void copy_and_substitute_in_size (tree, tree, VEC(subst_pair,heap) *); |
a1ab4c31 | 183 | static void rest_of_type_decl_compilation_no_defer (tree); |
1515785d OH |
184 | |
185 | /* The relevant constituents of a subprogram binding to a GCC builtin. Used | |
308e6f3a | 186 | to pass around calls performing profile compatibility checks. */ |
1515785d OH |
187 | |
188 | typedef struct { | |
189 | Entity_Id gnat_entity; /* The Ada subprogram entity. */ | |
190 | tree ada_fntype; /* The corresponding GCC type node. */ | |
191 | tree btin_fntype; /* The GCC builtin function type node. */ | |
192 | } intrin_binding_t; | |
193 | ||
194 | static bool intrin_profiles_compatible_p (intrin_binding_t *); | |
a1ab4c31 AC |
195 | \f |
196 | /* Given GNAT_ENTITY, a GNAT defining identifier node, which denotes some Ada | |
1e17ef87 EB |
197 | entity, return the equivalent GCC tree for that entity (a ..._DECL node) |
198 | and associate the ..._DECL node with the input GNAT defining identifier. | |
a1ab4c31 AC |
199 | |
200 | If GNAT_ENTITY is a variable or a constant declaration, GNU_EXPR gives its | |
1e17ef87 EB |
201 | initial value (in GCC tree form). This is optional for a variable. For |
202 | a renamed entity, GNU_EXPR gives the object being renamed. | |
a1ab4c31 AC |
203 | |
204 | DEFINITION is nonzero if this call is intended for a definition. This is | |
1e17ef87 EB |
205 | used for separate compilation where it is necessary to know whether an |
206 | external declaration or a definition must be created if the GCC equivalent | |
a1ab4c31 AC |
207 | was not created previously. The value of 1 is normally used for a nonzero |
208 | DEFINITION, but a value of 2 is used in special circumstances, defined in | |
209 | the code. */ | |
210 | ||
211 | tree | |
212 | gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, int definition) | |
213 | { | |
a8e05f92 EB |
214 | /* Contains the kind of the input GNAT node. */ |
215 | const Entity_Kind kind = Ekind (gnat_entity); | |
216 | /* True if this is a type. */ | |
217 | const bool is_type = IN (kind, Type_Kind); | |
86060344 EB |
218 | /* True if debug info is requested for this entity. */ |
219 | const bool debug_info_p = Needs_Debug_Info (gnat_entity); | |
220 | /* True if this entity is to be considered as imported. */ | |
221 | const bool imported_p | |
222 | = (Is_Imported (gnat_entity) && No (Address_Clause (gnat_entity))); | |
a8e05f92 EB |
223 | /* For a type, contains the equivalent GNAT node to be used in gigi. */ |
224 | Entity_Id gnat_equiv_type = Empty; | |
225 | /* Temporary used to walk the GNAT tree. */ | |
1e17ef87 | 226 | Entity_Id gnat_temp; |
1e17ef87 EB |
227 | /* Contains the GCC DECL node which is equivalent to the input GNAT node. |
228 | This node will be associated with the GNAT node by calling at the end | |
229 | of the `switch' statement. */ | |
a1ab4c31 | 230 | tree gnu_decl = NULL_TREE; |
1e17ef87 EB |
231 | /* Contains the GCC type to be used for the GCC node. */ |
232 | tree gnu_type = NULL_TREE; | |
233 | /* Contains the GCC size tree to be used for the GCC node. */ | |
234 | tree gnu_size = NULL_TREE; | |
235 | /* Contains the GCC name to be used for the GCC node. */ | |
0fb2335d | 236 | tree gnu_entity_name; |
1e17ef87 | 237 | /* True if we have already saved gnu_decl as a GNAT association. */ |
a1ab4c31 | 238 | bool saved = false; |
1e17ef87 | 239 | /* True if we incremented defer_incomplete_level. */ |
a1ab4c31 | 240 | bool this_deferred = false; |
1e17ef87 | 241 | /* True if we incremented force_global. */ |
a1ab4c31 | 242 | bool this_global = false; |
1e17ef87 | 243 | /* True if we should check to see if elaborated during processing. */ |
a1ab4c31 | 244 | bool maybe_present = false; |
1e17ef87 | 245 | /* True if we made GNU_DECL and its type here. */ |
a1ab4c31 | 246 | bool this_made_decl = false; |
a8e05f92 EB |
247 | /* Size and alignment of the GCC node, if meaningful. */ |
248 | unsigned int esize = 0, align = 0; | |
249 | /* Contains the list of attributes directly attached to the entity. */ | |
1e17ef87 | 250 | struct attrib *attr_list = NULL; |
a1ab4c31 AC |
251 | |
252 | /* Since a use of an Itype is a definition, process it as such if it | |
2ddc34ba | 253 | is not in a with'ed unit. */ |
1e17ef87 | 254 | if (!definition |
a8e05f92 | 255 | && is_type |
1e17ef87 | 256 | && Is_Itype (gnat_entity) |
a1ab4c31 AC |
257 | && !present_gnu_tree (gnat_entity) |
258 | && In_Extended_Main_Code_Unit (gnat_entity)) | |
259 | { | |
1e17ef87 EB |
260 | /* Ensure that we are in a subprogram mentioned in the Scope chain of |
261 | this entity, our current scope is global, or we encountered a task | |
262 | or entry (where we can't currently accurately check scoping). */ | |
a1ab4c31 AC |
263 | if (!current_function_decl |
264 | || DECL_ELABORATION_PROC_P (current_function_decl)) | |
265 | { | |
266 | process_type (gnat_entity); | |
267 | return get_gnu_tree (gnat_entity); | |
268 | } | |
269 | ||
270 | for (gnat_temp = Scope (gnat_entity); | |
1e17ef87 EB |
271 | Present (gnat_temp); |
272 | gnat_temp = Scope (gnat_temp)) | |
a1ab4c31 AC |
273 | { |
274 | if (Is_Type (gnat_temp)) | |
275 | gnat_temp = Underlying_Type (gnat_temp); | |
276 | ||
277 | if (Ekind (gnat_temp) == E_Subprogram_Body) | |
278 | gnat_temp | |
279 | = Corresponding_Spec (Parent (Declaration_Node (gnat_temp))); | |
280 | ||
281 | if (IN (Ekind (gnat_temp), Subprogram_Kind) | |
282 | && Present (Protected_Body_Subprogram (gnat_temp))) | |
283 | gnat_temp = Protected_Body_Subprogram (gnat_temp); | |
284 | ||
285 | if (Ekind (gnat_temp) == E_Entry | |
286 | || Ekind (gnat_temp) == E_Entry_Family | |
287 | || Ekind (gnat_temp) == E_Task_Type | |
288 | || (IN (Ekind (gnat_temp), Subprogram_Kind) | |
289 | && present_gnu_tree (gnat_temp) | |
290 | && (current_function_decl | |
291 | == gnat_to_gnu_entity (gnat_temp, NULL_TREE, 0)))) | |
292 | { | |
293 | process_type (gnat_entity); | |
294 | return get_gnu_tree (gnat_entity); | |
295 | } | |
296 | } | |
297 | ||
a8e05f92 | 298 | /* This abort means the Itype has an incorrect scope, i.e. that its |
1e17ef87 | 299 | scope does not correspond to the subprogram it is declared in. */ |
a1ab4c31 AC |
300 | gcc_unreachable (); |
301 | } | |
302 | ||
a1ab4c31 AC |
303 | /* If we've already processed this entity, return what we got last time. |
304 | If we are defining the node, we should not have already processed it. | |
1e17ef87 EB |
305 | In that case, we will abort below when we try to save a new GCC tree |
306 | for this object. We also need to handle the case of getting a dummy | |
307 | type when a Full_View exists. */ | |
a8e05f92 EB |
308 | if ((!definition || (is_type && imported_p)) |
309 | && present_gnu_tree (gnat_entity)) | |
a1ab4c31 AC |
310 | { |
311 | gnu_decl = get_gnu_tree (gnat_entity); | |
312 | ||
313 | if (TREE_CODE (gnu_decl) == TYPE_DECL | |
314 | && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl)) | |
315 | && IN (kind, Incomplete_Or_Private_Kind) | |
316 | && Present (Full_View (gnat_entity))) | |
317 | { | |
1e17ef87 EB |
318 | gnu_decl |
319 | = gnat_to_gnu_entity (Full_View (gnat_entity), NULL_TREE, 0); | |
a1ab4c31 AC |
320 | save_gnu_tree (gnat_entity, NULL_TREE, false); |
321 | save_gnu_tree (gnat_entity, gnu_decl, false); | |
322 | } | |
323 | ||
324 | return gnu_decl; | |
325 | } | |
326 | ||
327 | /* If this is a numeric or enumeral type, or an access type, a nonzero | |
328 | Esize must be specified unless it was specified by the programmer. */ | |
329 | gcc_assert (!Unknown_Esize (gnat_entity) | |
330 | || Has_Size_Clause (gnat_entity) | |
1e17ef87 EB |
331 | || (!IN (kind, Numeric_Kind) |
332 | && !IN (kind, Enumeration_Kind) | |
a1ab4c31 AC |
333 | && (!IN (kind, Access_Kind) |
334 | || kind == E_Access_Protected_Subprogram_Type | |
335 | || kind == E_Anonymous_Access_Protected_Subprogram_Type | |
336 | || kind == E_Access_Subtype))); | |
337 | ||
b4680ca1 | 338 | /* The RM size must be specified for all discrete and fixed-point types. */ |
a8e05f92 EB |
339 | gcc_assert (!(IN (kind, Discrete_Or_Fixed_Point_Kind) |
340 | && Unknown_RM_Size (gnat_entity))); | |
341 | ||
342 | /* If we get here, it means we have not yet done anything with this entity. | |
343 | If we are not defining it, it must be a type or an entity that is defined | |
344 | elsewhere or externally, otherwise we should have defined it already. */ | |
345 | gcc_assert (definition | |
346 | || type_annotate_only | |
347 | || is_type | |
348 | || kind == E_Discriminant | |
349 | || kind == E_Component | |
350 | || kind == E_Label | |
351 | || (kind == E_Constant && Present (Full_View (gnat_entity))) | |
352 | || Is_Public (gnat_entity)); | |
a1ab4c31 AC |
353 | |
354 | /* Get the name of the entity and set up the line number and filename of | |
355 | the original definition for use in any decl we make. */ | |
0fb2335d | 356 | gnu_entity_name = get_entity_name (gnat_entity); |
a1ab4c31 AC |
357 | Sloc_to_locus (Sloc (gnat_entity), &input_location); |
358 | ||
a1ab4c31 | 359 | /* For cases when we are not defining (i.e., we are referencing from |
1e17ef87 | 360 | another compilation unit) public entities, show we are at global level |
a1ab4c31 AC |
361 | for the purpose of computing scopes. Don't do this for components or |
362 | discriminants since the relevant test is whether or not the record is | |
2231f17f EB |
363 | being defined. Don't do this for constants either as we'll look into |
364 | their defining expression in the local context. */ | |
a962b0a1 | 365 | if (!definition |
a962b0a1 | 366 | && kind != E_Component |
a8e05f92 | 367 | && kind != E_Discriminant |
2231f17f | 368 | && kind != E_Constant |
a8e05f92 EB |
369 | && Is_Public (gnat_entity) |
370 | && !Is_Statically_Allocated (gnat_entity)) | |
a1ab4c31 AC |
371 | force_global++, this_global = true; |
372 | ||
373 | /* Handle any attributes directly attached to the entity. */ | |
374 | if (Has_Gigi_Rep_Item (gnat_entity)) | |
375 | prepend_attributes (gnat_entity, &attr_list); | |
376 | ||
a8e05f92 EB |
377 | /* Do some common processing for types. */ |
378 | if (is_type) | |
379 | { | |
380 | /* Compute the equivalent type to be used in gigi. */ | |
381 | gnat_equiv_type = Gigi_Equivalent_Type (gnat_entity); | |
382 | ||
383 | /* Machine_Attributes on types are expected to be propagated to | |
384 | subtypes. The corresponding Gigi_Rep_Items are only attached | |
385 | to the first subtype though, so we handle the propagation here. */ | |
386 | if (Base_Type (gnat_entity) != gnat_entity | |
387 | && !Is_First_Subtype (gnat_entity) | |
388 | && Has_Gigi_Rep_Item (First_Subtype (Base_Type (gnat_entity)))) | |
389 | prepend_attributes (First_Subtype (Base_Type (gnat_entity)), | |
390 | &attr_list); | |
391 | ||
392 | /* Compute a default value for the size of the type. */ | |
393 | if (Known_Esize (gnat_entity) | |
394 | && UI_Is_In_Int_Range (Esize (gnat_entity))) | |
395 | { | |
396 | unsigned int max_esize; | |
397 | esize = UI_To_Int (Esize (gnat_entity)); | |
398 | ||
399 | if (IN (kind, Float_Kind)) | |
400 | max_esize = fp_prec_to_size (LONG_DOUBLE_TYPE_SIZE); | |
401 | else if (IN (kind, Access_Kind)) | |
402 | max_esize = POINTER_SIZE * 2; | |
403 | else | |
404 | max_esize = LONG_LONG_TYPE_SIZE; | |
405 | ||
feec4372 EB |
406 | if (esize > max_esize) |
407 | esize = max_esize; | |
a8e05f92 EB |
408 | } |
409 | else | |
410 | esize = LONG_LONG_TYPE_SIZE; | |
411 | } | |
a1ab4c31 AC |
412 | |
413 | switch (kind) | |
414 | { | |
415 | case E_Constant: | |
8df2e902 EB |
416 | /* If this is a use of a deferred constant without address clause, |
417 | get its full definition. */ | |
418 | if (!definition | |
419 | && No (Address_Clause (gnat_entity)) | |
420 | && Present (Full_View (gnat_entity))) | |
a1ab4c31 | 421 | { |
8df2e902 EB |
422 | gnu_decl |
423 | = gnat_to_gnu_entity (Full_View (gnat_entity), gnu_expr, 0); | |
a1ab4c31 AC |
424 | saved = true; |
425 | break; | |
426 | } | |
427 | ||
428 | /* If we have an external constant that we are not defining, get the | |
50a6af05 EB |
429 | expression that is was defined to represent. We may throw it away |
430 | later if it is not a constant. But do not retrieve the expression | |
431 | if it is an allocator because the designated type might be dummy | |
432 | at this point. */ | |
a1ab4c31 | 433 | if (!definition |
a1ab4c31 | 434 | && !No_Initialization (Declaration_Node (gnat_entity)) |
50a6af05 EB |
435 | && Present (Expression (Declaration_Node (gnat_entity))) |
436 | && Nkind (Expression (Declaration_Node (gnat_entity))) | |
437 | != N_Allocator) | |
2231f17f EB |
438 | { |
439 | bool went_into_elab_proc = false; | |
440 | ||
441 | /* The expression may contain N_Expression_With_Actions nodes and | |
442 | thus object declarations from other units. In this case, even | |
443 | though the expression will eventually be discarded since not a | |
444 | constant, the declarations would be stuck either in the global | |
445 | varpool or in the current scope. Therefore we force the local | |
446 | context and create a fake scope that we'll zap at the end. */ | |
447 | if (!current_function_decl) | |
448 | { | |
449 | current_function_decl = get_elaboration_procedure (); | |
450 | went_into_elab_proc = true; | |
451 | } | |
452 | gnat_pushlevel (); | |
453 | ||
454 | gnu_expr = gnat_to_gnu (Expression (Declaration_Node (gnat_entity))); | |
455 | ||
456 | gnat_zaplevel (); | |
457 | if (went_into_elab_proc) | |
458 | current_function_decl = NULL_TREE; | |
459 | } | |
a1ab4c31 | 460 | |
8df2e902 EB |
461 | /* Ignore deferred constant definitions without address clause since |
462 | they are processed fully in the front-end. If No_Initialization | |
463 | is set, this is not a deferred constant but a constant whose value | |
464 | is built manually. And constants that are renamings are handled | |
465 | like variables. */ | |
466 | if (definition | |
467 | && !gnu_expr | |
468 | && No (Address_Clause (gnat_entity)) | |
a1ab4c31 AC |
469 | && !No_Initialization (Declaration_Node (gnat_entity)) |
470 | && No (Renamed_Object (gnat_entity))) | |
471 | { | |
472 | gnu_decl = error_mark_node; | |
473 | saved = true; | |
474 | break; | |
475 | } | |
8df2e902 EB |
476 | |
477 | /* Ignore constant definitions already marked with the error node. See | |
478 | the N_Object_Declaration case of gnat_to_gnu for the rationale. */ | |
479 | if (definition | |
480 | && gnu_expr | |
481 | && present_gnu_tree (gnat_entity) | |
482 | && get_gnu_tree (gnat_entity) == error_mark_node) | |
a1ab4c31 | 483 | { |
8df2e902 | 484 | maybe_present = true; |
a1ab4c31 AC |
485 | break; |
486 | } | |
487 | ||
488 | goto object; | |
489 | ||
490 | case E_Exception: | |
491 | /* We used to special case VMS exceptions here to directly map them to | |
492 | their associated condition code. Since this code had to be masked | |
493 | dynamically to strip off the severity bits, this caused trouble in | |
494 | the GCC/ZCX case because the "type" pointers we store in the tables | |
495 | have to be static. We now don't special case here anymore, and let | |
496 | the regular processing take place, which leaves us with a regular | |
497 | exception data object for VMS exceptions too. The condition code | |
498 | mapping is taken care of by the front end and the bitmasking by the | |
c01fe451 | 499 | run-time library. */ |
a1ab4c31 AC |
500 | goto object; |
501 | ||
502 | case E_Discriminant: | |
503 | case E_Component: | |
504 | { | |
2ddc34ba | 505 | /* The GNAT record where the component was defined. */ |
a1ab4c31 AC |
506 | Entity_Id gnat_record = Underlying_Type (Scope (gnat_entity)); |
507 | ||
508 | /* If the variable is an inherited record component (in the case of | |
509 | extended record types), just return the inherited entity, which | |
510 | must be a FIELD_DECL. Likewise for discriminants. | |
511 | For discriminants of untagged records which have explicit | |
512 | stored discriminants, return the entity for the corresponding | |
513 | stored discriminant. Also use Original_Record_Component | |
514 | if the record has a private extension. */ | |
a1ab4c31 AC |
515 | if (Present (Original_Record_Component (gnat_entity)) |
516 | && Original_Record_Component (gnat_entity) != gnat_entity) | |
517 | { | |
518 | gnu_decl | |
519 | = gnat_to_gnu_entity (Original_Record_Component (gnat_entity), | |
520 | gnu_expr, definition); | |
521 | saved = true; | |
522 | break; | |
523 | } | |
524 | ||
525 | /* If the enclosing record has explicit stored discriminants, | |
526 | then it is an untagged record. If the Corresponding_Discriminant | |
527 | is not empty then this must be a renamed discriminant and its | |
528 | Original_Record_Component must point to the corresponding explicit | |
1e17ef87 | 529 | stored discriminant (i.e. we should have taken the previous |
a1ab4c31 | 530 | branch). */ |
a1ab4c31 AC |
531 | else if (Present (Corresponding_Discriminant (gnat_entity)) |
532 | && Is_Tagged_Type (gnat_record)) | |
533 | { | |
2ddc34ba | 534 | /* A tagged record has no explicit stored discriminants. */ |
a1ab4c31 AC |
535 | gcc_assert (First_Discriminant (gnat_record) |
536 | == First_Stored_Discriminant (gnat_record)); | |
537 | gnu_decl | |
538 | = gnat_to_gnu_entity (Corresponding_Discriminant (gnat_entity), | |
539 | gnu_expr, definition); | |
540 | saved = true; | |
541 | break; | |
542 | } | |
543 | ||
544 | else if (Present (CR_Discriminant (gnat_entity)) | |
545 | && type_annotate_only) | |
546 | { | |
547 | gnu_decl = gnat_to_gnu_entity (CR_Discriminant (gnat_entity), | |
548 | gnu_expr, definition); | |
549 | saved = true; | |
550 | break; | |
551 | } | |
552 | ||
2ddc34ba EB |
553 | /* If the enclosing record has explicit stored discriminants, then |
554 | it is an untagged record. If the Corresponding_Discriminant | |
a1ab4c31 AC |
555 | is not empty then this must be a renamed discriminant and its |
556 | Original_Record_Component must point to the corresponding explicit | |
1e17ef87 | 557 | stored discriminant (i.e. we should have taken the first |
a1ab4c31 | 558 | branch). */ |
a1ab4c31 AC |
559 | else if (Present (Corresponding_Discriminant (gnat_entity)) |
560 | && (First_Discriminant (gnat_record) | |
561 | != First_Stored_Discriminant (gnat_record))) | |
562 | gcc_unreachable (); | |
563 | ||
564 | /* Otherwise, if we are not defining this and we have no GCC type | |
565 | for the containing record, make one for it. Then we should | |
566 | have made our own equivalent. */ | |
567 | else if (!definition && !present_gnu_tree (gnat_record)) | |
568 | { | |
569 | /* ??? If this is in a record whose scope is a protected | |
570 | type and we have an Original_Record_Component, use it. | |
571 | This is a workaround for major problems in protected type | |
572 | handling. */ | |
573 | Entity_Id Scop = Scope (Scope (gnat_entity)); | |
574 | if ((Is_Protected_Type (Scop) | |
575 | || (Is_Private_Type (Scop) | |
576 | && Present (Full_View (Scop)) | |
577 | && Is_Protected_Type (Full_View (Scop)))) | |
578 | && Present (Original_Record_Component (gnat_entity))) | |
579 | { | |
580 | gnu_decl | |
581 | = gnat_to_gnu_entity (Original_Record_Component | |
582 | (gnat_entity), | |
583 | gnu_expr, 0); | |
584 | saved = true; | |
585 | break; | |
586 | } | |
587 | ||
588 | gnat_to_gnu_entity (Scope (gnat_entity), NULL_TREE, 0); | |
589 | gnu_decl = get_gnu_tree (gnat_entity); | |
590 | saved = true; | |
591 | break; | |
592 | } | |
593 | ||
594 | else | |
595 | /* Here we have no GCC type and this is a reference rather than a | |
2ddc34ba | 596 | definition. This should never happen. Most likely the cause is |
a1ab4c31 AC |
597 | reference before declaration in the gnat tree for gnat_entity. */ |
598 | gcc_unreachable (); | |
599 | } | |
600 | ||
601 | case E_Loop_Parameter: | |
602 | case E_Out_Parameter: | |
603 | case E_Variable: | |
604 | ||
86060344 | 605 | /* Simple variables, loop variables, Out parameters and exceptions. */ |
a1ab4c31 AC |
606 | object: |
607 | { | |
a1ab4c31 AC |
608 | bool const_flag |
609 | = ((kind == E_Constant || kind == E_Variable) | |
610 | && Is_True_Constant (gnat_entity) | |
22868cbf | 611 | && !Treat_As_Volatile (gnat_entity) |
a1ab4c31 AC |
612 | && (((Nkind (Declaration_Node (gnat_entity)) |
613 | == N_Object_Declaration) | |
614 | && Present (Expression (Declaration_Node (gnat_entity)))) | |
901ad63f | 615 | || Present (Renamed_Object (gnat_entity)) |
c679a915 | 616 | || imported_p)); |
a1ab4c31 AC |
617 | bool inner_const_flag = const_flag; |
618 | bool static_p = Is_Statically_Allocated (gnat_entity); | |
619 | bool mutable_p = false; | |
86060344 | 620 | bool used_by_ref = false; |
a1ab4c31 AC |
621 | tree gnu_ext_name = NULL_TREE; |
622 | tree renamed_obj = NULL_TREE; | |
623 | tree gnu_object_size; | |
624 | ||
625 | if (Present (Renamed_Object (gnat_entity)) && !definition) | |
626 | { | |
627 | if (kind == E_Exception) | |
628 | gnu_expr = gnat_to_gnu_entity (Renamed_Entity (gnat_entity), | |
629 | NULL_TREE, 0); | |
630 | else | |
631 | gnu_expr = gnat_to_gnu (Renamed_Object (gnat_entity)); | |
632 | } | |
633 | ||
634 | /* Get the type after elaborating the renamed object. */ | |
635 | gnu_type = gnat_to_gnu_type (Etype (gnat_entity)); | |
636 | ||
871fda0a EB |
637 | /* If this is a standard exception definition, then use the standard |
638 | exception type. This is necessary to make sure that imported and | |
639 | exported views of exceptions are properly merged in LTO mode. */ | |
640 | if (TREE_CODE (TYPE_NAME (gnu_type)) == TYPE_DECL | |
641 | && DECL_NAME (TYPE_NAME (gnu_type)) == exception_data_name_id) | |
642 | gnu_type = except_type_node; | |
643 | ||
56345d11 | 644 | /* For a debug renaming declaration, build a debug-only entity. */ |
a1ab4c31 AC |
645 | if (Present (Debug_Renaming_Link (gnat_entity))) |
646 | { | |
56345d11 EB |
647 | /* Force a non-null value to make sure the symbol is retained. */ |
648 | tree value = build1 (INDIRECT_REF, gnu_type, | |
649 | build1 (NOP_EXPR, | |
650 | build_pointer_type (gnu_type), | |
651 | integer_minus_one_node)); | |
c172df28 AH |
652 | gnu_decl = build_decl (input_location, |
653 | VAR_DECL, gnu_entity_name, gnu_type); | |
56345d11 EB |
654 | SET_DECL_VALUE_EXPR (gnu_decl, value); |
655 | DECL_HAS_VALUE_EXPR_P (gnu_decl) = 1; | |
a1ab4c31 AC |
656 | gnat_pushdecl (gnu_decl, gnat_entity); |
657 | break; | |
658 | } | |
659 | ||
660 | /* If this is a loop variable, its type should be the base type. | |
661 | This is because the code for processing a loop determines whether | |
662 | a normal loop end test can be done by comparing the bounds of the | |
663 | loop against those of the base type, which is presumed to be the | |
664 | size used for computation. But this is not correct when the size | |
665 | of the subtype is smaller than the type. */ | |
666 | if (kind == E_Loop_Parameter) | |
667 | gnu_type = get_base_type (gnu_type); | |
668 | ||
86060344 EB |
669 | /* Reject non-renamed objects whose type is an unconstrained array or |
670 | any object whose type is a dummy type or void. */ | |
a1ab4c31 AC |
671 | if ((TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE |
672 | && No (Renamed_Object (gnat_entity))) | |
673 | || TYPE_IS_DUMMY_P (gnu_type) | |
674 | || TREE_CODE (gnu_type) == VOID_TYPE) | |
675 | { | |
676 | gcc_assert (type_annotate_only); | |
677 | if (this_global) | |
678 | force_global--; | |
679 | return error_mark_node; | |
680 | } | |
681 | ||
aae8570a EB |
682 | /* If an alignment is specified, use it if valid. Note that exceptions |
683 | are objects but don't have an alignment. We must do this before we | |
684 | validate the size, since the alignment can affect the size. */ | |
a1ab4c31 AC |
685 | if (kind != E_Exception && Known_Alignment (gnat_entity)) |
686 | { | |
687 | gcc_assert (Present (Alignment (gnat_entity))); | |
4184ef1b | 688 | |
a1ab4c31 AC |
689 | align = validate_alignment (Alignment (gnat_entity), gnat_entity, |
690 | TYPE_ALIGN (gnu_type)); | |
86060344 | 691 | |
aae8570a EB |
692 | /* No point in changing the type if there is an address clause |
693 | as the final type of the object will be a reference type. */ | |
694 | if (Present (Address_Clause (gnat_entity))) | |
695 | align = 0; | |
696 | else | |
4184ef1b EB |
697 | { |
698 | tree orig_type = gnu_type; | |
699 | ||
700 | gnu_type | |
701 | = maybe_pad_type (gnu_type, NULL_TREE, align, gnat_entity, | |
702 | false, false, definition, true); | |
703 | ||
704 | /* If a padding record was made, declare it now since it will | |
705 | never be declared otherwise. This is necessary to ensure | |
706 | that its subtrees are properly marked. */ | |
707 | if (gnu_type != orig_type && !DECL_P (TYPE_NAME (gnu_type))) | |
708 | create_type_decl (TYPE_NAME (gnu_type), gnu_type, NULL, true, | |
709 | debug_info_p, gnat_entity); | |
710 | } | |
a1ab4c31 AC |
711 | } |
712 | ||
86060344 EB |
713 | /* If we are defining the object, see if it has a Size and validate it |
714 | if so. If we are not defining the object and a Size clause applies, | |
715 | simply retrieve the value. We don't want to ignore the clause and | |
716 | it is expected to have been validated already. Then get the new | |
717 | type, if any. */ | |
a1ab4c31 AC |
718 | if (definition) |
719 | gnu_size = validate_size (Esize (gnat_entity), gnu_type, | |
720 | gnat_entity, VAR_DECL, false, | |
721 | Has_Size_Clause (gnat_entity)); | |
722 | else if (Has_Size_Clause (gnat_entity)) | |
723 | gnu_size = UI_To_gnu (Esize (gnat_entity), bitsizetype); | |
724 | ||
725 | if (gnu_size) | |
726 | { | |
727 | gnu_type | |
728 | = make_type_from_size (gnu_type, gnu_size, | |
729 | Has_Biased_Representation (gnat_entity)); | |
730 | ||
731 | if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0)) | |
732 | gnu_size = NULL_TREE; | |
733 | } | |
734 | ||
735 | /* If this object has self-referential size, it must be a record with | |
86060344 EB |
736 | a default discriminant. We are supposed to allocate an object of |
737 | the maximum size in this case, unless it is a constant with an | |
a1ab4c31 AC |
738 | initializing expression, in which case we can get the size from |
739 | that. Note that the resulting size may still be a variable, so | |
740 | this may end up with an indirect allocation. */ | |
741 | if (No (Renamed_Object (gnat_entity)) | |
742 | && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))) | |
743 | { | |
744 | if (gnu_expr && kind == E_Constant) | |
745 | { | |
746 | tree size = TYPE_SIZE (TREE_TYPE (gnu_expr)); | |
747 | if (CONTAINS_PLACEHOLDER_P (size)) | |
748 | { | |
749 | /* If the initializing expression is itself a constant, | |
750 | despite having a nominal type with self-referential | |
751 | size, we can get the size directly from it. */ | |
752 | if (TREE_CODE (gnu_expr) == COMPONENT_REF | |
a1ab4c31 AC |
753 | && TYPE_IS_PADDING_P |
754 | (TREE_TYPE (TREE_OPERAND (gnu_expr, 0))) | |
755 | && TREE_CODE (TREE_OPERAND (gnu_expr, 0)) == VAR_DECL | |
756 | && (TREE_READONLY (TREE_OPERAND (gnu_expr, 0)) | |
757 | || DECL_READONLY_ONCE_ELAB | |
758 | (TREE_OPERAND (gnu_expr, 0)))) | |
759 | gnu_size = DECL_SIZE (TREE_OPERAND (gnu_expr, 0)); | |
760 | else | |
761 | gnu_size | |
762 | = SUBSTITUTE_PLACEHOLDER_IN_EXPR (size, gnu_expr); | |
763 | } | |
764 | else | |
765 | gnu_size = size; | |
766 | } | |
767 | /* We may have no GNU_EXPR because No_Initialization is | |
768 | set even though there's an Expression. */ | |
769 | else if (kind == E_Constant | |
770 | && (Nkind (Declaration_Node (gnat_entity)) | |
771 | == N_Object_Declaration) | |
772 | && Present (Expression (Declaration_Node (gnat_entity)))) | |
773 | gnu_size | |
774 | = TYPE_SIZE (gnat_to_gnu_type | |
775 | (Etype | |
776 | (Expression (Declaration_Node (gnat_entity))))); | |
777 | else | |
778 | { | |
779 | gnu_size = max_size (TYPE_SIZE (gnu_type), true); | |
780 | mutable_p = true; | |
781 | } | |
782 | } | |
783 | ||
86060344 EB |
784 | /* If the size is zero byte, make it one byte since some linkers have |
785 | troubles with zero-sized objects. If the object will have a | |
a1ab4c31 AC |
786 | template, that will make it nonzero so don't bother. Also avoid |
787 | doing that for an object renaming or an object with an address | |
788 | clause, as we would lose useful information on the view size | |
789 | (e.g. for null array slices) and we are not allocating the object | |
790 | here anyway. */ | |
791 | if (((gnu_size | |
792 | && integer_zerop (gnu_size) | |
793 | && !TREE_OVERFLOW (gnu_size)) | |
794 | || (TYPE_SIZE (gnu_type) | |
795 | && integer_zerop (TYPE_SIZE (gnu_type)) | |
796 | && !TREE_OVERFLOW (TYPE_SIZE (gnu_type)))) | |
797 | && (!Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity)) | |
798 | || !Is_Array_Type (Etype (gnat_entity))) | |
a8e05f92 EB |
799 | && No (Renamed_Object (gnat_entity)) |
800 | && No (Address_Clause (gnat_entity))) | |
a1ab4c31 AC |
801 | gnu_size = bitsize_unit_node; |
802 | ||
803 | /* If this is an object with no specified size and alignment, and | |
804 | if either it is atomic or we are not optimizing alignment for | |
805 | space and it is composite and not an exception, an Out parameter | |
806 | or a reference to another object, and the size of its type is a | |
807 | constant, set the alignment to the smallest one which is not | |
808 | smaller than the size, with an appropriate cap. */ | |
809 | if (!gnu_size && align == 0 | |
810 | && (Is_Atomic (gnat_entity) | |
811 | || (!Optimize_Alignment_Space (gnat_entity) | |
812 | && kind != E_Exception | |
813 | && kind != E_Out_Parameter | |
814 | && Is_Composite_Type (Etype (gnat_entity)) | |
815 | && !Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity)) | |
c679a915 | 816 | && !Is_Exported (gnat_entity) |
a1ab4c31 AC |
817 | && !imported_p |
818 | && No (Renamed_Object (gnat_entity)) | |
819 | && No (Address_Clause (gnat_entity)))) | |
820 | && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST) | |
821 | { | |
822 | /* No point in jumping through all the hoops needed in order | |
bb3da4f2 EB |
823 | to support BIGGEST_ALIGNMENT if we don't really have to. |
824 | So we cap to the smallest alignment that corresponds to | |
825 | a known efficient memory access pattern of the target. */ | |
a1ab4c31 AC |
826 | unsigned int align_cap = Is_Atomic (gnat_entity) |
827 | ? BIGGEST_ALIGNMENT | |
bb3da4f2 | 828 | : get_mode_alignment (ptr_mode); |
a1ab4c31 AC |
829 | |
830 | if (!host_integerp (TYPE_SIZE (gnu_type), 1) | |
831 | || compare_tree_int (TYPE_SIZE (gnu_type), align_cap) >= 0) | |
832 | align = align_cap; | |
833 | else | |
834 | align = ceil_alignment (tree_low_cst (TYPE_SIZE (gnu_type), 1)); | |
835 | ||
836 | /* But make sure not to under-align the object. */ | |
837 | if (align <= TYPE_ALIGN (gnu_type)) | |
838 | align = 0; | |
839 | ||
840 | /* And honor the minimum valid atomic alignment, if any. */ | |
841 | #ifdef MINIMUM_ATOMIC_ALIGNMENT | |
842 | else if (align < MINIMUM_ATOMIC_ALIGNMENT) | |
843 | align = MINIMUM_ATOMIC_ALIGNMENT; | |
844 | #endif | |
845 | } | |
846 | ||
847 | /* If the object is set to have atomic components, find the component | |
848 | type and validate it. | |
849 | ||
850 | ??? Note that we ignore Has_Volatile_Components on objects; it's | |
2ddc34ba | 851 | not at all clear what to do in that case. */ |
a1ab4c31 AC |
852 | if (Has_Atomic_Components (gnat_entity)) |
853 | { | |
854 | tree gnu_inner = (TREE_CODE (gnu_type) == ARRAY_TYPE | |
855 | ? TREE_TYPE (gnu_type) : gnu_type); | |
856 | ||
857 | while (TREE_CODE (gnu_inner) == ARRAY_TYPE | |
858 | && TYPE_MULTI_ARRAY_P (gnu_inner)) | |
859 | gnu_inner = TREE_TYPE (gnu_inner); | |
860 | ||
861 | check_ok_for_atomic (gnu_inner, gnat_entity, true); | |
862 | } | |
863 | ||
864 | /* Now check if the type of the object allows atomic access. Note | |
865 | that we must test the type, even if this object has size and | |
86060344 EB |
866 | alignment to allow such access, because we will be going inside |
867 | the padded record to assign to the object. We could fix this by | |
868 | always copying via an intermediate value, but it's not clear it's | |
869 | worth the effort. */ | |
a1ab4c31 AC |
870 | if (Is_Atomic (gnat_entity)) |
871 | check_ok_for_atomic (gnu_type, gnat_entity, false); | |
872 | ||
873 | /* If this is an aliased object with an unconstrained nominal subtype, | |
874 | make a type that includes the template. */ | |
875 | if (Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity)) | |
876 | && Is_Array_Type (Etype (gnat_entity)) | |
877 | && !type_annotate_only) | |
4184ef1b EB |
878 | { |
879 | tree gnu_fat | |
880 | = TREE_TYPE (gnat_to_gnu_type (Base_Type (Etype (gnat_entity)))); | |
881 | gnu_type | |
882 | = build_unc_object_type_from_ptr (gnu_fat, gnu_type, | |
883 | concat_name (gnu_entity_name, | |
884 | "UNC"), | |
885 | debug_info_p); | |
886 | } | |
a1ab4c31 AC |
887 | |
888 | #ifdef MINIMUM_ATOMIC_ALIGNMENT | |
889 | /* If the size is a constant and no alignment is specified, force | |
890 | the alignment to be the minimum valid atomic alignment. The | |
891 | restriction on constant size avoids problems with variable-size | |
892 | temporaries; if the size is variable, there's no issue with | |
893 | atomic access. Also don't do this for a constant, since it isn't | |
894 | necessary and can interfere with constant replacement. Finally, | |
895 | do not do it for Out parameters since that creates an | |
896 | size inconsistency with In parameters. */ | |
897 | if (align == 0 && MINIMUM_ATOMIC_ALIGNMENT > TYPE_ALIGN (gnu_type) | |
898 | && !FLOAT_TYPE_P (gnu_type) | |
899 | && !const_flag && No (Renamed_Object (gnat_entity)) | |
900 | && !imported_p && No (Address_Clause (gnat_entity)) | |
901 | && kind != E_Out_Parameter | |
902 | && (gnu_size ? TREE_CODE (gnu_size) == INTEGER_CST | |
903 | : TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST)) | |
904 | align = MINIMUM_ATOMIC_ALIGNMENT; | |
905 | #endif | |
906 | ||
907 | /* Make a new type with the desired size and alignment, if needed. | |
908 | But do not take into account alignment promotions to compute the | |
909 | size of the object. */ | |
910 | gnu_object_size = gnu_size ? gnu_size : TYPE_SIZE (gnu_type); | |
911 | if (gnu_size || align > 0) | |
51c7954d EB |
912 | { |
913 | tree orig_type = gnu_type; | |
914 | ||
915 | gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity, | |
916 | false, false, definition, | |
917 | gnu_size ? true : false); | |
918 | ||
919 | /* If a padding record was made, declare it now since it will | |
920 | never be declared otherwise. This is necessary to ensure | |
921 | that its subtrees are properly marked. */ | |
922 | if (gnu_type != orig_type && !DECL_P (TYPE_NAME (gnu_type))) | |
923 | create_type_decl (TYPE_NAME (gnu_type), gnu_type, NULL, true, | |
924 | debug_info_p, gnat_entity); | |
925 | } | |
a1ab4c31 | 926 | |
a1ab4c31 AC |
927 | /* If this is a renaming, avoid as much as possible to create a new |
928 | object. However, in several cases, creating it is required. | |
929 | This processing needs to be applied to the raw expression so | |
930 | as to make it more likely to rename the underlying object. */ | |
931 | if (Present (Renamed_Object (gnat_entity))) | |
932 | { | |
933 | bool create_normal_object = false; | |
934 | ||
935 | /* If the renamed object had padding, strip off the reference | |
936 | to the inner object and reset our type. */ | |
937 | if ((TREE_CODE (gnu_expr) == COMPONENT_REF | |
a1ab4c31 AC |
938 | && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))) |
939 | /* Strip useless conversions around the object. */ | |
3b9c1abd EB |
940 | || (TREE_CODE (gnu_expr) == NOP_EXPR |
941 | && gnat_types_compatible_p | |
942 | (TREE_TYPE (gnu_expr), | |
943 | TREE_TYPE (TREE_OPERAND (gnu_expr, 0))))) | |
a1ab4c31 AC |
944 | { |
945 | gnu_expr = TREE_OPERAND (gnu_expr, 0); | |
946 | gnu_type = TREE_TYPE (gnu_expr); | |
947 | } | |
948 | ||
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. As a consequence, it can | |
953 | be the inner object of a constant renaming. In this case, the | |
954 | renaming must be fully instantiated, i.e. it cannot be a mere | |
955 | reference to (part of) an existing object. */ | |
956 | if (const_flag) | |
957 | { | |
958 | tree inner_object = gnu_expr; | |
959 | while (handled_component_p (inner_object)) | |
960 | inner_object = TREE_OPERAND (inner_object, 0); | |
961 | if (TREE_CODE (inner_object) == CALL_EXPR) | |
962 | create_normal_object = true; | |
963 | } | |
964 | ||
965 | /* Otherwise, see if we can proceed with a stabilized version of | |
966 | the renamed entity or if we need to make a new object. */ | |
967 | if (!create_normal_object) | |
968 | { | |
969 | tree maybe_stable_expr = NULL_TREE; | |
970 | bool stable = false; | |
971 | ||
972 | /* Case 2: If the renaming entity need not be materialized and | |
973 | the renamed expression is something we can stabilize, use | |
974 | that for the renaming. At the global level, we can only do | |
975 | this if we know no SAVE_EXPRs need be made, because the | |
976 | expression we return might be used in arbitrary conditional | |
2231f17f EB |
977 | branches so we must force the evaluation of the SAVE_EXPRs |
978 | immediately and this requires a proper function context. | |
979 | Note that an external constant is at the global level. */ | |
a1ab4c31 | 980 | if (!Materialize_Entity (gnat_entity) |
2231f17f EB |
981 | && (!((!definition && kind == E_Constant) |
982 | || global_bindings_p ()) | |
a1ab4c31 AC |
983 | || (staticp (gnu_expr) |
984 | && !TREE_SIDE_EFFECTS (gnu_expr)))) | |
985 | { | |
986 | maybe_stable_expr | |
7d7a1fe8 | 987 | = gnat_stabilize_reference (gnu_expr, true, &stable); |
a1ab4c31 AC |
988 | |
989 | if (stable) | |
990 | { | |
a1ab4c31 AC |
991 | /* ??? No DECL_EXPR is created so we need to mark |
992 | the expression manually lest it is shared. */ | |
2231f17f EB |
993 | if ((!definition && kind == E_Constant) |
994 | || global_bindings_p ()) | |
3f13dd77 EB |
995 | MARK_VISITED (maybe_stable_expr); |
996 | gnu_decl = maybe_stable_expr; | |
a1ab4c31 AC |
997 | save_gnu_tree (gnat_entity, gnu_decl, true); |
998 | saved = true; | |
f4cd2542 | 999 | annotate_object (gnat_entity, gnu_type, NULL_TREE, |
0c700259 | 1000 | false, false); |
a1ab4c31 AC |
1001 | break; |
1002 | } | |
1003 | ||
1004 | /* The stabilization failed. Keep maybe_stable_expr | |
1005 | untouched here to let the pointer case below know | |
1006 | about that failure. */ | |
1007 | } | |
1008 | ||
1009 | /* Case 3: If this is a constant renaming and creating a | |
1010 | new object is allowed and cheap, treat it as a normal | |
1011 | object whose initial value is what is being renamed. */ | |
d5859bf4 EB |
1012 | if (const_flag |
1013 | && !Is_Composite_Type | |
1014 | (Underlying_Type (Etype (gnat_entity)))) | |
a1ab4c31 AC |
1015 | ; |
1016 | ||
1017 | /* Case 4: Make this into a constant pointer to the object we | |
1018 | are to rename and attach the object to the pointer if it is | |
1019 | something we can stabilize. | |
1020 | ||
1021 | From the proper scope, attached objects will be referenced | |
1022 | directly instead of indirectly via the pointer to avoid | |
1023 | subtle aliasing problems with non-addressable entities. | |
1024 | They have to be stable because we must not evaluate the | |
1025 | variables in the expression every time the renaming is used. | |
1026 | The pointer is called a "renaming" pointer in this case. | |
1027 | ||
1028 | In the rare cases where we cannot stabilize the renamed | |
1029 | object, we just make a "bare" pointer, and the renamed | |
1030 | entity is always accessed indirectly through it. */ | |
1031 | else | |
1032 | { | |
1033 | gnu_type = build_reference_type (gnu_type); | |
1034 | inner_const_flag = TREE_READONLY (gnu_expr); | |
1035 | const_flag = true; | |
1036 | ||
1037 | /* If the previous attempt at stabilizing failed, there | |
1038 | is no point in trying again and we reuse the result | |
1039 | without attaching it to the pointer. In this case it | |
1040 | will only be used as the initializing expression of | |
1041 | the pointer and thus needs no special treatment with | |
1042 | regard to multiple evaluations. */ | |
1043 | if (maybe_stable_expr) | |
1044 | ; | |
1045 | ||
1046 | /* Otherwise, try to stabilize and attach the expression | |
1047 | to the pointer if the stabilization succeeds. | |
1048 | ||
1049 | Note that this might introduce SAVE_EXPRs and we don't | |
1050 | check whether we're at the global level or not. This | |
1051 | is fine since we are building a pointer initializer and | |
1052 | neither the pointer nor the initializing expression can | |
1053 | be accessed before the pointer elaboration has taken | |
1054 | place in a correct program. | |
1055 | ||
1056 | These SAVE_EXPRs will be evaluated at the right place | |
1057 | by either the evaluation of the initializer for the | |
1058 | non-global case or the elaboration code for the global | |
1059 | case, and will be attached to the elaboration procedure | |
1060 | in the latter case. */ | |
1061 | else | |
1062 | { | |
1063 | maybe_stable_expr | |
7d7a1fe8 | 1064 | = gnat_stabilize_reference (gnu_expr, true, &stable); |
a1ab4c31 AC |
1065 | |
1066 | if (stable) | |
1067 | renamed_obj = maybe_stable_expr; | |
1068 | ||
1069 | /* Attaching is actually performed downstream, as soon | |
1070 | as we have a VAR_DECL for the pointer we make. */ | |
1071 | } | |
1072 | ||
58c8f770 EB |
1073 | gnu_expr = build_unary_op (ADDR_EXPR, gnu_type, |
1074 | maybe_stable_expr); | |
a1ab4c31 AC |
1075 | |
1076 | gnu_size = NULL_TREE; | |
1077 | used_by_ref = true; | |
1078 | } | |
1079 | } | |
1080 | } | |
1081 | ||
9cf18af8 EB |
1082 | /* Make a volatile version of this object's type if we are to make |
1083 | the object volatile. We also interpret 13.3(19) conservatively | |
2f283818 | 1084 | and disallow any optimizations for such a non-constant object. */ |
9cf18af8 | 1085 | if ((Treat_As_Volatile (gnat_entity) |
2f283818 | 1086 | || (!const_flag |
871fda0a | 1087 | && gnu_type != except_type_node |
2f283818 | 1088 | && (Is_Exported (gnat_entity) |
c679a915 | 1089 | || imported_p |
2f283818 | 1090 | || Present (Address_Clause (gnat_entity))))) |
9cf18af8 EB |
1091 | && !TYPE_VOLATILE (gnu_type)) |
1092 | gnu_type = build_qualified_type (gnu_type, | |
1093 | (TYPE_QUALS (gnu_type) | |
1094 | | TYPE_QUAL_VOLATILE)); | |
1095 | ||
1096 | /* If we are defining an aliased object whose nominal subtype is | |
1097 | unconstrained, the object is a record that contains both the | |
1098 | template and the object. If there is an initializer, it will | |
1099 | have already been converted to the right type, but we need to | |
1100 | create the template if there is no initializer. */ | |
1101 | if (definition | |
1102 | && !gnu_expr | |
1103 | && TREE_CODE (gnu_type) == RECORD_TYPE | |
1104 | && (TYPE_CONTAINS_TEMPLATE_P (gnu_type) | |
afb4afcd | 1105 | /* Beware that padding might have been introduced above. */ |
315cff15 | 1106 | || (TYPE_PADDING_P (gnu_type) |
9cf18af8 EB |
1107 | && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type))) |
1108 | == RECORD_TYPE | |
1109 | && TYPE_CONTAINS_TEMPLATE_P | |
1110 | (TREE_TYPE (TYPE_FIELDS (gnu_type)))))) | |
a1ab4c31 AC |
1111 | { |
1112 | tree template_field | |
315cff15 | 1113 | = TYPE_PADDING_P (gnu_type) |
a1ab4c31 AC |
1114 | ? TYPE_FIELDS (TREE_TYPE (TYPE_FIELDS (gnu_type))) |
1115 | : TYPE_FIELDS (gnu_type); | |
0e228dd9 NF |
1116 | VEC(constructor_elt,gc) *v = VEC_alloc (constructor_elt, gc, 1); |
1117 | tree t = build_template (TREE_TYPE (template_field), | |
910ad8de | 1118 | TREE_TYPE (DECL_CHAIN (template_field)), |
0e228dd9 NF |
1119 | NULL_TREE); |
1120 | CONSTRUCTOR_APPEND_ELT (v, template_field, t); | |
1121 | gnu_expr = gnat_build_constructor (gnu_type, v); | |
a1ab4c31 AC |
1122 | } |
1123 | ||
1124 | /* Convert the expression to the type of the object except in the | |
1125 | case where the object's type is unconstrained or the object's type | |
1126 | is a padded record whose field is of self-referential size. In | |
1127 | the former case, converting will generate unnecessary evaluations | |
1128 | of the CONSTRUCTOR to compute the size and in the latter case, we | |
1129 | want to only copy the actual data. */ | |
1130 | if (gnu_expr | |
1131 | && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE | |
1132 | && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)) | |
315cff15 EB |
1133 | && !(TYPE_IS_PADDING_P (gnu_type) |
1134 | && CONTAINS_PLACEHOLDER_P | |
1135 | (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type)))))) | |
a1ab4c31 AC |
1136 | gnu_expr = convert (gnu_type, gnu_expr); |
1137 | ||
86060344 EB |
1138 | /* If this is a pointer that doesn't have an initializing expression, |
1139 | initialize it to NULL, unless the object is imported. */ | |
a1ab4c31 | 1140 | if (definition |
315cff15 | 1141 | && (POINTER_TYPE_P (gnu_type) || TYPE_IS_FAT_POINTER_P (gnu_type)) |
86060344 EB |
1142 | && !gnu_expr |
1143 | && !Is_Imported (gnat_entity)) | |
a1ab4c31 AC |
1144 | gnu_expr = integer_zero_node; |
1145 | ||
8df2e902 EB |
1146 | /* If we are defining the object and it has an Address clause, we must |
1147 | either get the address expression from the saved GCC tree for the | |
1148 | object if it has a Freeze node, or elaborate the address expression | |
1149 | here since the front-end has guaranteed that the elaboration has no | |
1150 | effects in this case. */ | |
a1ab4c31 AC |
1151 | if (definition && Present (Address_Clause (gnat_entity))) |
1152 | { | |
86060344 | 1153 | Node_Id gnat_expr = Expression (Address_Clause (gnat_entity)); |
a1ab4c31 | 1154 | tree gnu_address |
8df2e902 | 1155 | = present_gnu_tree (gnat_entity) |
86060344 | 1156 | ? get_gnu_tree (gnat_entity) : gnat_to_gnu (gnat_expr); |
a1ab4c31 AC |
1157 | |
1158 | save_gnu_tree (gnat_entity, NULL_TREE, false); | |
1159 | ||
1160 | /* Ignore the size. It's either meaningless or was handled | |
1161 | above. */ | |
1162 | gnu_size = NULL_TREE; | |
1163 | /* Convert the type of the object to a reference type that can | |
1164 | alias everything as per 13.3(19). */ | |
1165 | gnu_type | |
1166 | = build_reference_type_for_mode (gnu_type, ptr_mode, true); | |
1167 | gnu_address = convert (gnu_type, gnu_address); | |
1168 | used_by_ref = true; | |
86060344 EB |
1169 | const_flag |
1170 | = !Is_Public (gnat_entity) | |
1171 | || compile_time_known_address_p (gnat_expr); | |
a1ab4c31 | 1172 | |
8df2e902 EB |
1173 | /* If this is a deferred constant, the initializer is attached to |
1174 | the full view. */ | |
1175 | if (kind == E_Constant && Present (Full_View (gnat_entity))) | |
1176 | gnu_expr | |
1177 | = gnat_to_gnu | |
1178 | (Expression (Declaration_Node (Full_View (gnat_entity)))); | |
1179 | ||
a1ab4c31 AC |
1180 | /* If we don't have an initializing expression for the underlying |
1181 | variable, the initializing expression for the pointer is the | |
1182 | specified address. Otherwise, we have to make a COMPOUND_EXPR | |
1183 | to assign both the address and the initial value. */ | |
1184 | if (!gnu_expr) | |
1185 | gnu_expr = gnu_address; | |
1186 | else | |
1187 | gnu_expr | |
1188 | = build2 (COMPOUND_EXPR, gnu_type, | |
1189 | build_binary_op | |
1190 | (MODIFY_EXPR, NULL_TREE, | |
1191 | build_unary_op (INDIRECT_REF, NULL_TREE, | |
1192 | gnu_address), | |
1193 | gnu_expr), | |
1194 | gnu_address); | |
1195 | } | |
1196 | ||
1197 | /* If it has an address clause and we are not defining it, mark it | |
1198 | as an indirect object. Likewise for Stdcall objects that are | |
1199 | imported. */ | |
1200 | if ((!definition && Present (Address_Clause (gnat_entity))) | |
1201 | || (Is_Imported (gnat_entity) | |
1202 | && Has_Stdcall_Convention (gnat_entity))) | |
1203 | { | |
1204 | /* Convert the type of the object to a reference type that can | |
1205 | alias everything as per 13.3(19). */ | |
1206 | gnu_type | |
1207 | = build_reference_type_for_mode (gnu_type, ptr_mode, true); | |
1208 | gnu_size = NULL_TREE; | |
1209 | ||
1210 | /* No point in taking the address of an initializing expression | |
1211 | that isn't going to be used. */ | |
1212 | gnu_expr = NULL_TREE; | |
1213 | ||
1214 | /* If it has an address clause whose value is known at compile | |
1215 | time, make the object a CONST_DECL. This will avoid a | |
1216 | useless dereference. */ | |
1217 | if (Present (Address_Clause (gnat_entity))) | |
1218 | { | |
1219 | Node_Id gnat_address | |
1220 | = Expression (Address_Clause (gnat_entity)); | |
1221 | ||
1222 | if (compile_time_known_address_p (gnat_address)) | |
1223 | { | |
1224 | gnu_expr = gnat_to_gnu (gnat_address); | |
1225 | const_flag = true; | |
1226 | } | |
1227 | } | |
1228 | ||
1229 | used_by_ref = true; | |
1230 | } | |
1231 | ||
1232 | /* If we are at top level and this object is of variable size, | |
1233 | make the actual type a hidden pointer to the real type and | |
1234 | make the initializer be a memory allocation and initialization. | |
1235 | Likewise for objects we aren't defining (presumed to be | |
1236 | external references from other packages), but there we do | |
1237 | not set up an initialization. | |
1238 | ||
1239 | If the object's size overflows, make an allocator too, so that | |
1240 | Storage_Error gets raised. Note that we will never free | |
1241 | such memory, so we presume it never will get allocated. */ | |
a1ab4c31 | 1242 | if (!allocatable_size_p (TYPE_SIZE_UNIT (gnu_type), |
86060344 EB |
1243 | global_bindings_p () |
1244 | || !definition | |
a1ab4c31 | 1245 | || static_p) |
86060344 EB |
1246 | || (gnu_size && !allocatable_size_p (gnu_size, |
1247 | global_bindings_p () | |
1248 | || !definition | |
1249 | || static_p))) | |
a1ab4c31 AC |
1250 | { |
1251 | gnu_type = build_reference_type (gnu_type); | |
1252 | gnu_size = NULL_TREE; | |
1253 | used_by_ref = true; | |
a1ab4c31 AC |
1254 | |
1255 | /* In case this was a aliased object whose nominal subtype is | |
1256 | unconstrained, the pointer above will be a thin pointer and | |
1257 | build_allocator will automatically make the template. | |
1258 | ||
1259 | If we have a template initializer only (that we made above), | |
1260 | pretend there is none and rely on what build_allocator creates | |
1261 | again anyway. Otherwise (if we have a full initializer), get | |
1262 | the data part and feed that to build_allocator. | |
1263 | ||
1264 | If we are elaborating a mutable object, tell build_allocator to | |
1265 | ignore a possibly simpler size from the initializer, if any, as | |
1266 | we must allocate the maximum possible size in this case. */ | |
f25496f3 | 1267 | if (definition && !imported_p) |
a1ab4c31 AC |
1268 | { |
1269 | tree gnu_alloc_type = TREE_TYPE (gnu_type); | |
1270 | ||
1271 | if (TREE_CODE (gnu_alloc_type) == RECORD_TYPE | |
1272 | && TYPE_CONTAINS_TEMPLATE_P (gnu_alloc_type)) | |
1273 | { | |
1274 | gnu_alloc_type | |
910ad8de | 1275 | = TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (gnu_alloc_type))); |
a1ab4c31 AC |
1276 | |
1277 | if (TREE_CODE (gnu_expr) == CONSTRUCTOR | |
1278 | && 1 == VEC_length (constructor_elt, | |
1279 | CONSTRUCTOR_ELTS (gnu_expr))) | |
1280 | gnu_expr = 0; | |
1281 | else | |
1282 | gnu_expr | |
1283 | = build_component_ref | |
1284 | (gnu_expr, NULL_TREE, | |
910ad8de | 1285 | DECL_CHAIN (TYPE_FIELDS (TREE_TYPE (gnu_expr))), |
a1ab4c31 AC |
1286 | false); |
1287 | } | |
1288 | ||
1289 | if (TREE_CODE (TYPE_SIZE_UNIT (gnu_alloc_type)) == INTEGER_CST | |
f25496f3 | 1290 | && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_alloc_type))) |
c01fe451 | 1291 | post_error ("?`Storage_Error` will be raised at run time!", |
a1ab4c31 AC |
1292 | gnat_entity); |
1293 | ||
6f61bd41 EB |
1294 | gnu_expr |
1295 | = build_allocator (gnu_alloc_type, gnu_expr, gnu_type, | |
1296 | Empty, Empty, gnat_entity, mutable_p); | |
f25496f3 | 1297 | const_flag = true; |
a1ab4c31 AC |
1298 | } |
1299 | else | |
1300 | { | |
1301 | gnu_expr = NULL_TREE; | |
1302 | const_flag = false; | |
1303 | } | |
1304 | } | |
1305 | ||
1306 | /* If this object would go into the stack and has an alignment larger | |
1307 | than the largest stack alignment the back-end can honor, resort to | |
1308 | a variable of "aligning type". */ | |
1309 | if (!global_bindings_p () && !static_p && definition | |
1310 | && !imported_p && TYPE_ALIGN (gnu_type) > BIGGEST_ALIGNMENT) | |
1311 | { | |
1312 | /* Create the new variable. No need for extra room before the | |
1313 | aligned field as this is in automatic storage. */ | |
1314 | tree gnu_new_type | |
1315 | = make_aligning_type (gnu_type, TYPE_ALIGN (gnu_type), | |
1316 | TYPE_SIZE_UNIT (gnu_type), | |
1317 | BIGGEST_ALIGNMENT, 0); | |
1318 | tree gnu_new_var | |
1319 | = create_var_decl (create_concat_name (gnat_entity, "ALIGN"), | |
1320 | NULL_TREE, gnu_new_type, NULL_TREE, false, | |
1321 | false, false, false, NULL, gnat_entity); | |
1322 | ||
1323 | /* Initialize the aligned field if we have an initializer. */ | |
1324 | if (gnu_expr) | |
1325 | add_stmt_with_node | |
1326 | (build_binary_op (MODIFY_EXPR, NULL_TREE, | |
1327 | build_component_ref | |
1328 | (gnu_new_var, NULL_TREE, | |
1329 | TYPE_FIELDS (gnu_new_type), false), | |
1330 | gnu_expr), | |
1331 | gnat_entity); | |
1332 | ||
1333 | /* And setup this entity as a reference to the aligned field. */ | |
1334 | gnu_type = build_reference_type (gnu_type); | |
1335 | gnu_expr | |
1336 | = build_unary_op | |
1337 | (ADDR_EXPR, gnu_type, | |
1338 | build_component_ref (gnu_new_var, NULL_TREE, | |
1339 | TYPE_FIELDS (gnu_new_type), false)); | |
1340 | ||
1341 | gnu_size = NULL_TREE; | |
1342 | used_by_ref = true; | |
1343 | const_flag = true; | |
1344 | } | |
1345 | ||
1346 | if (const_flag) | |
1347 | gnu_type = build_qualified_type (gnu_type, (TYPE_QUALS (gnu_type) | |
1348 | | TYPE_QUAL_CONST)); | |
1349 | ||
1350 | /* Convert the expression to the type of the object except in the | |
1351 | case where the object's type is unconstrained or the object's type | |
1352 | is a padded record whose field is of self-referential size. In | |
1353 | the former case, converting will generate unnecessary evaluations | |
1354 | of the CONSTRUCTOR to compute the size and in the latter case, we | |
1355 | want to only copy the actual data. */ | |
1356 | if (gnu_expr | |
1357 | && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE | |
1358 | && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)) | |
315cff15 EB |
1359 | && !(TYPE_IS_PADDING_P (gnu_type) |
1360 | && CONTAINS_PLACEHOLDER_P | |
1361 | (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type)))))) | |
a1ab4c31 AC |
1362 | gnu_expr = convert (gnu_type, gnu_expr); |
1363 | ||
1364 | /* If this name is external or there was a name specified, use it, | |
1365 | unless this is a VMS exception object since this would conflict | |
1366 | with the symbol we need to export in addition. Don't use the | |
1367 | Interface_Name if there is an address clause (see CD30005). */ | |
1368 | if (!Is_VMS_Exception (gnat_entity) | |
1369 | && ((Present (Interface_Name (gnat_entity)) | |
1370 | && No (Address_Clause (gnat_entity))) | |
1371 | || (Is_Public (gnat_entity) | |
1372 | && (!Is_Imported (gnat_entity) | |
1373 | || Is_Exported (gnat_entity))))) | |
0fb2335d | 1374 | gnu_ext_name = create_concat_name (gnat_entity, NULL); |
a1ab4c31 | 1375 | |
58c8f770 EB |
1376 | /* If this is an aggregate constant initialized to a constant, force it |
1377 | to be statically allocated. This saves an initialization copy. */ | |
1378 | if (!static_p | |
1379 | && const_flag | |
a5b8aacd EB |
1380 | && gnu_expr && TREE_CONSTANT (gnu_expr) |
1381 | && AGGREGATE_TYPE_P (gnu_type) | |
a1ab4c31 | 1382 | && host_integerp (TYPE_SIZE_UNIT (gnu_type), 1) |
315cff15 | 1383 | && !(TYPE_IS_PADDING_P (gnu_type) |
a5b8aacd EB |
1384 | && !host_integerp (TYPE_SIZE_UNIT |
1385 | (TREE_TYPE (TYPE_FIELDS (gnu_type))), 1))) | |
a1ab4c31 AC |
1386 | static_p = true; |
1387 | ||
86060344 | 1388 | /* Now create the variable or the constant and set various flags. */ |
58c8f770 EB |
1389 | gnu_decl |
1390 | = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type, | |
1391 | gnu_expr, const_flag, Is_Public (gnat_entity), | |
1392 | imported_p || !definition, static_p, attr_list, | |
1393 | gnat_entity); | |
a1ab4c31 AC |
1394 | DECL_BY_REF_P (gnu_decl) = used_by_ref; |
1395 | DECL_POINTS_TO_READONLY_P (gnu_decl) = used_by_ref && inner_const_flag; | |
86060344 EB |
1396 | |
1397 | /* If we are defining an Out parameter and optimization isn't enabled, | |
1398 | create a fake PARM_DECL for debugging purposes and make it point to | |
1399 | the VAR_DECL. Suppress debug info for the latter but make sure it | |
1400 | will live on the stack so that it can be accessed from within the | |
1401 | debugger through the PARM_DECL. */ | |
1402 | if (kind == E_Out_Parameter && definition && !optimize && debug_info_p) | |
1403 | { | |
1404 | tree param = create_param_decl (gnu_entity_name, gnu_type, false); | |
1405 | gnat_pushdecl (param, gnat_entity); | |
1406 | SET_DECL_VALUE_EXPR (param, gnu_decl); | |
1407 | DECL_HAS_VALUE_EXPR_P (param) = 1; | |
1408 | DECL_IGNORED_P (gnu_decl) = 1; | |
1409 | TREE_ADDRESSABLE (gnu_decl) = 1; | |
1410 | } | |
1411 | ||
1412 | /* If this is a renaming pointer, attach the renamed object to it and | |
2231f17f EB |
1413 | register it if we are at the global level. Note that an external |
1414 | constant is at the global level. */ | |
a1ab4c31 AC |
1415 | if (TREE_CODE (gnu_decl) == VAR_DECL && renamed_obj) |
1416 | { | |
1417 | SET_DECL_RENAMED_OBJECT (gnu_decl, renamed_obj); | |
2231f17f | 1418 | if ((!definition && kind == E_Constant) || global_bindings_p ()) |
a1ab4c31 AC |
1419 | { |
1420 | DECL_RENAMING_GLOBAL_P (gnu_decl) = 1; | |
1421 | record_global_renaming_pointer (gnu_decl); | |
1422 | } | |
1423 | } | |
1424 | ||
86060344 EB |
1425 | /* If this is a constant and we are defining it or it generates a real |
1426 | symbol at the object level and we are referencing it, we may want | |
1427 | or need to have a true variable to represent it: | |
1428 | - if optimization isn't enabled, for debugging purposes, | |
1429 | - if the constant is public and not overlaid on something else, | |
1430 | - if its address is taken, | |
1431 | - if either itself or its type is aliased. */ | |
a1ab4c31 AC |
1432 | if (TREE_CODE (gnu_decl) == CONST_DECL |
1433 | && (definition || Sloc (gnat_entity) > Standard_Location) | |
86060344 EB |
1434 | && ((!optimize && debug_info_p) |
1435 | || (Is_Public (gnat_entity) | |
1436 | && No (Address_Clause (gnat_entity))) | |
a1ab4c31 AC |
1437 | || Address_Taken (gnat_entity) |
1438 | || Is_Aliased (gnat_entity) | |
1439 | || Is_Aliased (Etype (gnat_entity)))) | |
1440 | { | |
1441 | tree gnu_corr_var | |
0fb2335d | 1442 | = create_true_var_decl (gnu_entity_name, gnu_ext_name, gnu_type, |
a1ab4c31 | 1443 | gnu_expr, true, Is_Public (gnat_entity), |
44059479 | 1444 | !definition, static_p, attr_list, |
a1ab4c31 AC |
1445 | gnat_entity); |
1446 | ||
1447 | SET_DECL_CONST_CORRESPONDING_VAR (gnu_decl, gnu_corr_var); | |
1448 | ||
1449 | /* As debugging information will be generated for the variable, | |
86060344 EB |
1450 | do not generate debugging information for the constant. */ |
1451 | if (debug_info_p) | |
1452 | DECL_IGNORED_P (gnu_decl) = 1; | |
1453 | else | |
1454 | DECL_IGNORED_P (gnu_corr_var) = 1; | |
a1ab4c31 AC |
1455 | } |
1456 | ||
cb3d597d EB |
1457 | /* If this is a constant, even if we don't need a true variable, we |
1458 | may need to avoid returning the initializer in every case. That | |
1459 | can happen for the address of a (constant) constructor because, | |
1460 | upon dereferencing it, the constructor will be reinjected in the | |
1461 | tree, which may not be valid in every case; see lvalue_required_p | |
1462 | for more details. */ | |
1463 | if (TREE_CODE (gnu_decl) == CONST_DECL) | |
1464 | DECL_CONST_ADDRESS_P (gnu_decl) = constructor_address_p (gnu_expr); | |
1465 | ||
86060344 EB |
1466 | /* If this object is declared in a block that contains a block with an |
1467 | exception handler, and we aren't using the GCC exception mechanism, | |
1468 | we must force this variable in memory in order to avoid an invalid | |
1469 | optimization. */ | |
1470 | if (Exception_Mechanism != Back_End_Exceptions | |
1471 | && Has_Nested_Block_With_Handler (Scope (gnat_entity))) | |
a1ab4c31 AC |
1472 | TREE_ADDRESSABLE (gnu_decl) = 1; |
1473 | ||
86060344 EB |
1474 | /* If we are defining an object with variable size or an object with |
1475 | fixed size that will be dynamically allocated, and we are using the | |
1476 | setjmp/longjmp exception mechanism, update the setjmp buffer. */ | |
1477 | if (definition | |
1478 | && Exception_Mechanism == Setjmp_Longjmp | |
1479 | && get_block_jmpbuf_decl () | |
1480 | && DECL_SIZE_UNIT (gnu_decl) | |
1481 | && (TREE_CODE (DECL_SIZE_UNIT (gnu_decl)) != INTEGER_CST | |
1482 | || (flag_stack_check == GENERIC_STACK_CHECK | |
1483 | && compare_tree_int (DECL_SIZE_UNIT (gnu_decl), | |
1484 | STACK_CHECK_MAX_VAR_SIZE) > 0))) | |
1485 | add_stmt_with_node (build_call_1_expr | |
1486 | (update_setjmp_buf_decl, | |
1487 | build_unary_op (ADDR_EXPR, NULL_TREE, | |
1488 | get_block_jmpbuf_decl ())), | |
1489 | gnat_entity); | |
1490 | ||
f4cd2542 EB |
1491 | /* Back-annotate Esize and Alignment of the object if not already |
1492 | known. Note that we pick the values of the type, not those of | |
1493 | the object, to shield ourselves from low-level platform-dependent | |
1494 | adjustments like alignment promotion. This is both consistent with | |
1495 | all the treatment above, where alignment and size are set on the | |
1496 | type of the object and not on the object directly, and makes it | |
1497 | possible to support all confirming representation clauses. */ | |
1498 | annotate_object (gnat_entity, TREE_TYPE (gnu_decl), gnu_object_size, | |
0c700259 | 1499 | used_by_ref, false); |
a1ab4c31 AC |
1500 | } |
1501 | break; | |
1502 | ||
1503 | case E_Void: | |
1504 | /* Return a TYPE_DECL for "void" that we previously made. */ | |
10069d53 | 1505 | gnu_decl = TYPE_NAME (void_type_node); |
a1ab4c31 AC |
1506 | break; |
1507 | ||
1508 | case E_Enumeration_Type: | |
a8e05f92 | 1509 | /* A special case: for the types Character and Wide_Character in |
2ddc34ba | 1510 | Standard, we do not list all the literals. So if the literals |
a1ab4c31 AC |
1511 | are not specified, make this an unsigned type. */ |
1512 | if (No (First_Literal (gnat_entity))) | |
1513 | { | |
1514 | gnu_type = make_unsigned_type (esize); | |
0fb2335d | 1515 | TYPE_NAME (gnu_type) = gnu_entity_name; |
a1ab4c31 | 1516 | |
a8e05f92 | 1517 | /* Set TYPE_STRING_FLAG for Character and Wide_Character types. |
2ddc34ba EB |
1518 | This is needed by the DWARF-2 back-end to distinguish between |
1519 | unsigned integer types and character types. */ | |
a1ab4c31 AC |
1520 | TYPE_STRING_FLAG (gnu_type) = 1; |
1521 | break; | |
1522 | } | |
1523 | ||
a1ab4c31 | 1524 | { |
ca37373a EB |
1525 | /* We have a list of enumeral constants in First_Literal. We make a |
1526 | CONST_DECL for each one and build into GNU_LITERAL_LIST the list to | |
1527 | be placed into TYPE_FIELDS. Each node in the list is a TREE_LIST | |
1528 | whose TREE_VALUE is the literal name and whose TREE_PURPOSE is the | |
1529 | value of the literal. But when we have a regular boolean type, we | |
1530 | simplify this a little by using a BOOLEAN_TYPE. */ | |
1531 | bool is_boolean = Is_Boolean_Type (gnat_entity) | |
1532 | && !Has_Non_Standard_Rep (gnat_entity); | |
a1ab4c31 | 1533 | tree gnu_literal_list = NULL_TREE; |
ca37373a | 1534 | Entity_Id gnat_literal; |
a1ab4c31 AC |
1535 | |
1536 | if (Is_Unsigned_Type (gnat_entity)) | |
1537 | gnu_type = make_unsigned_type (esize); | |
1538 | else | |
1539 | gnu_type = make_signed_type (esize); | |
1540 | ||
ca37373a | 1541 | TREE_SET_CODE (gnu_type, is_boolean ? BOOLEAN_TYPE : ENUMERAL_TYPE); |
a1ab4c31 AC |
1542 | |
1543 | for (gnat_literal = First_Literal (gnat_entity); | |
1544 | Present (gnat_literal); | |
1545 | gnat_literal = Next_Literal (gnat_literal)) | |
1546 | { | |
ca37373a EB |
1547 | tree gnu_value |
1548 | = UI_To_gnu (Enumeration_Rep (gnat_literal), gnu_type); | |
a1ab4c31 AC |
1549 | tree gnu_literal |
1550 | = create_var_decl (get_entity_name (gnat_literal), NULL_TREE, | |
1551 | gnu_type, gnu_value, true, false, false, | |
1552 | false, NULL, gnat_literal); | |
66de86b0 EB |
1553 | /* Do not generate debug info for individual enumerators. */ |
1554 | DECL_IGNORED_P (gnu_literal) = 1; | |
a1ab4c31 AC |
1555 | save_gnu_tree (gnat_literal, gnu_literal, false); |
1556 | gnu_literal_list = tree_cons (DECL_NAME (gnu_literal), | |
1557 | gnu_value, gnu_literal_list); | |
1558 | } | |
1559 | ||
ca37373a EB |
1560 | if (!is_boolean) |
1561 | TYPE_VALUES (gnu_type) = nreverse (gnu_literal_list); | |
a1ab4c31 AC |
1562 | |
1563 | /* Note that the bounds are updated at the end of this function | |
a8e05f92 | 1564 | to avoid an infinite recursion since they refer to the type. */ |
a1ab4c31 | 1565 | } |
40d1f6af | 1566 | goto discrete_type; |
a1ab4c31 AC |
1567 | |
1568 | case E_Signed_Integer_Type: | |
1569 | case E_Ordinary_Fixed_Point_Type: | |
1570 | case E_Decimal_Fixed_Point_Type: | |
1571 | /* For integer types, just make a signed type the appropriate number | |
1572 | of bits. */ | |
1573 | gnu_type = make_signed_type (esize); | |
40d1f6af | 1574 | goto discrete_type; |
a1ab4c31 AC |
1575 | |
1576 | case E_Modular_Integer_Type: | |
a1ab4c31 | 1577 | { |
b4680ca1 EB |
1578 | /* For modular types, make the unsigned type of the proper number |
1579 | of bits and then set up the modulus, if required. */ | |
1580 | tree gnu_modulus, gnu_high = NULL_TREE; | |
a1ab4c31 | 1581 | |
b4680ca1 EB |
1582 | /* Packed array types are supposed to be subtypes only. */ |
1583 | gcc_assert (!Is_Packed_Array_Type (gnat_entity)); | |
a1ab4c31 | 1584 | |
a8e05f92 | 1585 | gnu_type = make_unsigned_type (esize); |
a1ab4c31 AC |
1586 | |
1587 | /* Get the modulus in this type. If it overflows, assume it is because | |
1588 | it is equal to 2**Esize. Note that there is no overflow checking | |
1589 | done on unsigned type, so we detect the overflow by looking for | |
1590 | a modulus of zero, which is otherwise invalid. */ | |
1591 | gnu_modulus = UI_To_gnu (Modulus (gnat_entity), gnu_type); | |
1592 | ||
1593 | if (!integer_zerop (gnu_modulus)) | |
1594 | { | |
1595 | TYPE_MODULAR_P (gnu_type) = 1; | |
1596 | SET_TYPE_MODULUS (gnu_type, gnu_modulus); | |
1597 | gnu_high = fold_build2 (MINUS_EXPR, gnu_type, gnu_modulus, | |
1598 | convert (gnu_type, integer_one_node)); | |
1599 | } | |
1600 | ||
a8e05f92 EB |
1601 | /* If the upper bound is not maximal, make an extra subtype. */ |
1602 | if (gnu_high | |
1603 | && !tree_int_cst_equal (gnu_high, TYPE_MAX_VALUE (gnu_type))) | |
a1ab4c31 | 1604 | { |
a8e05f92 | 1605 | tree gnu_subtype = make_unsigned_type (esize); |
84fb43a1 | 1606 | SET_TYPE_RM_MAX_VALUE (gnu_subtype, gnu_high); |
a1ab4c31 | 1607 | TREE_TYPE (gnu_subtype) = gnu_type; |
a1ab4c31 | 1608 | TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1; |
a8e05f92 | 1609 | TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "UMT"); |
a1ab4c31 AC |
1610 | gnu_type = gnu_subtype; |
1611 | } | |
1612 | } | |
40d1f6af | 1613 | goto discrete_type; |
a1ab4c31 AC |
1614 | |
1615 | case E_Signed_Integer_Subtype: | |
1616 | case E_Enumeration_Subtype: | |
1617 | case E_Modular_Integer_Subtype: | |
1618 | case E_Ordinary_Fixed_Point_Subtype: | |
1619 | case E_Decimal_Fixed_Point_Subtype: | |
1620 | ||
26383c64 | 1621 | /* For integral subtypes, we make a new INTEGER_TYPE. Note that we do |
84fb43a1 | 1622 | not want to call create_range_type since we would like each subtype |
26383c64 | 1623 | node to be distinct. ??? Historically this was in preparation for |
c1abd261 | 1624 | when memory aliasing is implemented, but that's obsolete now given |
26383c64 | 1625 | the call to relate_alias_sets below. |
a1ab4c31 | 1626 | |
a8e05f92 EB |
1627 | The TREE_TYPE field of the INTEGER_TYPE points to the base type; |
1628 | this fact is used by the arithmetic conversion functions. | |
a1ab4c31 | 1629 | |
a8e05f92 EB |
1630 | We elaborate the Ancestor_Subtype if it is not in the current unit |
1631 | and one of our bounds is non-static. We do this to ensure consistent | |
1632 | naming in the case where several subtypes share the same bounds, by | |
1633 | elaborating the first such subtype first, thus using its name. */ | |
a1ab4c31 AC |
1634 | |
1635 | if (!definition | |
1636 | && Present (Ancestor_Subtype (gnat_entity)) | |
1637 | && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity)) | |
1638 | && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity)) | |
1639 | || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity)))) | |
b4680ca1 | 1640 | gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity), gnu_expr, 0); |
a1ab4c31 | 1641 | |
84fb43a1 | 1642 | /* Set the precision to the Esize except for bit-packed arrays. */ |
a1ab4c31 AC |
1643 | if (Is_Packed_Array_Type (gnat_entity) |
1644 | && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))) | |
6e0f0975 | 1645 | esize = UI_To_Int (RM_Size (gnat_entity)); |
a1ab4c31 | 1646 | |
84fb43a1 EB |
1647 | /* This should be an unsigned type if the base type is unsigned or |
1648 | if the lower bound is constant and non-negative or if the type | |
1649 | is biased. */ | |
1650 | if (Is_Unsigned_Type (Etype (gnat_entity)) | |
1651 | || Is_Unsigned_Type (gnat_entity) | |
1652 | || Has_Biased_Representation (gnat_entity)) | |
1653 | gnu_type = make_unsigned_type (esize); | |
1654 | else | |
1655 | gnu_type = make_signed_type (esize); | |
1656 | TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity)); | |
a1ab4c31 | 1657 | |
84fb43a1 EB |
1658 | SET_TYPE_RM_MIN_VALUE |
1659 | (gnu_type, | |
1660 | convert (TREE_TYPE (gnu_type), | |
1661 | elaborate_expression (Type_Low_Bound (gnat_entity), | |
1662 | gnat_entity, get_identifier ("L"), | |
1663 | definition, true, | |
1664 | Needs_Debug_Info (gnat_entity)))); | |
1665 | ||
1666 | SET_TYPE_RM_MAX_VALUE | |
1667 | (gnu_type, | |
1668 | convert (TREE_TYPE (gnu_type), | |
1669 | elaborate_expression (Type_High_Bound (gnat_entity), | |
1670 | gnat_entity, get_identifier ("U"), | |
1671 | definition, true, | |
1672 | Needs_Debug_Info (gnat_entity)))); | |
a1ab4c31 AC |
1673 | |
1674 | /* One of the above calls might have caused us to be elaborated, | |
1675 | so don't blow up if so. */ | |
1676 | if (present_gnu_tree (gnat_entity)) | |
1677 | { | |
1678 | maybe_present = true; | |
1679 | break; | |
1680 | } | |
1681 | ||
1682 | TYPE_BIASED_REPRESENTATION_P (gnu_type) | |
1683 | = Has_Biased_Representation (gnat_entity); | |
1684 | ||
4fd78fe6 EB |
1685 | /* Attach the TYPE_STUB_DECL in case we have a parallel type. */ |
1686 | TYPE_STUB_DECL (gnu_type) | |
1687 | = create_type_stub_decl (gnu_entity_name, gnu_type); | |
1688 | ||
a1ab4c31 AC |
1689 | /* Inherit our alias set from what we're a subtype of. Subtypes |
1690 | are not different types and a pointer can designate any instance | |
1691 | within a subtype hierarchy. */ | |
794511d2 | 1692 | relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY); |
a1ab4c31 | 1693 | |
4fd78fe6 EB |
1694 | /* For a packed array, make the original array type a parallel type. */ |
1695 | if (debug_info_p | |
1696 | && Is_Packed_Array_Type (gnat_entity) | |
1697 | && present_gnu_tree (Original_Array_Type (gnat_entity))) | |
1698 | add_parallel_type (TYPE_STUB_DECL (gnu_type), | |
1699 | gnat_to_gnu_type | |
1700 | (Original_Array_Type (gnat_entity))); | |
1701 | ||
40d1f6af EB |
1702 | discrete_type: |
1703 | ||
b1fa9126 EB |
1704 | /* We have to handle clauses that under-align the type specially. */ |
1705 | if ((Present (Alignment_Clause (gnat_entity)) | |
1706 | || (Is_Packed_Array_Type (gnat_entity) | |
1707 | && Present | |
1708 | (Alignment_Clause (Original_Array_Type (gnat_entity))))) | |
1709 | && UI_Is_In_Int_Range (Alignment (gnat_entity))) | |
1710 | { | |
1711 | align = UI_To_Int (Alignment (gnat_entity)) * BITS_PER_UNIT; | |
1712 | if (align >= TYPE_ALIGN (gnu_type)) | |
1713 | align = 0; | |
1714 | } | |
1715 | ||
6e0f0975 | 1716 | /* If the type we are dealing with represents a bit-packed array, |
a1ab4c31 AC |
1717 | we need to have the bits left justified on big-endian targets |
1718 | and right justified on little-endian targets. We also need to | |
1719 | ensure that when the value is read (e.g. for comparison of two | |
1720 | such values), we only get the good bits, since the unused bits | |
6e0f0975 EB |
1721 | are uninitialized. Both goals are accomplished by wrapping up |
1722 | the modular type in an enclosing record type. */ | |
a1ab4c31 | 1723 | if (Is_Packed_Array_Type (gnat_entity) |
01ddebf2 | 1724 | && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))) |
a1ab4c31 | 1725 | { |
6e0f0975 | 1726 | tree gnu_field_type, gnu_field; |
a1ab4c31 | 1727 | |
b1fa9126 | 1728 | /* Set the RM size before wrapping up the original type. */ |
84fb43a1 EB |
1729 | SET_TYPE_RM_SIZE (gnu_type, |
1730 | UI_To_gnu (RM_Size (gnat_entity), bitsizetype)); | |
6e0f0975 | 1731 | TYPE_PACKED_ARRAY_TYPE_P (gnu_type) = 1; |
b1fa9126 EB |
1732 | |
1733 | /* Create a stripped-down declaration, mainly for debugging. */ | |
1734 | create_type_decl (gnu_entity_name, gnu_type, NULL, true, | |
1735 | debug_info_p, gnat_entity); | |
1736 | ||
1737 | /* Now save it and build the enclosing record type. */ | |
6e0f0975 EB |
1738 | gnu_field_type = gnu_type; |
1739 | ||
a1ab4c31 AC |
1740 | gnu_type = make_node (RECORD_TYPE); |
1741 | TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "JM"); | |
a1ab4c31 | 1742 | TYPE_PACKED (gnu_type) = 1; |
b1fa9126 EB |
1743 | TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_field_type); |
1744 | TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_field_type); | |
1745 | SET_TYPE_ADA_SIZE (gnu_type, TYPE_RM_SIZE (gnu_field_type)); | |
1746 | ||
1747 | /* Propagate the alignment of the modular type to the record type, | |
1748 | unless there is an alignment clause that under-aligns the type. | |
1749 | This means that bit-packed arrays are given "ceil" alignment for | |
1750 | their size by default, which may seem counter-intuitive but makes | |
1751 | it possible to overlay them on modular types easily. */ | |
1752 | TYPE_ALIGN (gnu_type) | |
1753 | = align > 0 ? align : TYPE_ALIGN (gnu_field_type); | |
a1ab4c31 | 1754 | |
b1fa9126 | 1755 | relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY); |
a1ab4c31 | 1756 | |
40d1f6af EB |
1757 | /* Don't declare the field as addressable since we won't be taking |
1758 | its address and this would prevent create_field_decl from making | |
1759 | a bitfield. */ | |
da01bfee EB |
1760 | gnu_field |
1761 | = create_field_decl (get_identifier ("OBJECT"), gnu_field_type, | |
1762 | gnu_type, NULL_TREE, bitsize_zero_node, 1, 0); | |
a1ab4c31 | 1763 | |
032d1b71 | 1764 | /* Do not emit debug info until after the parallel type is added. */ |
b1fa9126 EB |
1765 | finish_record_type (gnu_type, gnu_field, 2, false); |
1766 | compute_record_mode (gnu_type); | |
a1ab4c31 | 1767 | TYPE_JUSTIFIED_MODULAR_P (gnu_type) = 1; |
a1ab4c31 | 1768 | |
032d1b71 EB |
1769 | if (debug_info_p) |
1770 | { | |
1771 | /* Make the original array type a parallel type. */ | |
1772 | if (present_gnu_tree (Original_Array_Type (gnat_entity))) | |
1773 | add_parallel_type (TYPE_STUB_DECL (gnu_type), | |
1774 | gnat_to_gnu_type | |
1775 | (Original_Array_Type (gnat_entity))); | |
4fd78fe6 | 1776 | |
032d1b71 EB |
1777 | rest_of_record_type_compilation (gnu_type); |
1778 | } | |
a1ab4c31 AC |
1779 | } |
1780 | ||
1781 | /* If the type we are dealing with has got a smaller alignment than the | |
1782 | natural one, we need to wrap it up in a record type and under-align | |
1783 | the latter. We reuse the padding machinery for this purpose. */ | |
b1fa9126 | 1784 | else if (align > 0) |
a1ab4c31 | 1785 | { |
6e0f0975 EB |
1786 | tree gnu_field_type, gnu_field; |
1787 | ||
1788 | /* Set the RM size before wrapping up the type. */ | |
84fb43a1 EB |
1789 | SET_TYPE_RM_SIZE (gnu_type, |
1790 | UI_To_gnu (RM_Size (gnat_entity), bitsizetype)); | |
b1fa9126 EB |
1791 | |
1792 | /* Create a stripped-down declaration, mainly for debugging. */ | |
1793 | create_type_decl (gnu_entity_name, gnu_type, NULL, true, | |
1794 | debug_info_p, gnat_entity); | |
1795 | ||
1796 | /* Now save it and build the enclosing record type. */ | |
6e0f0975 | 1797 | gnu_field_type = gnu_type; |
a1ab4c31 AC |
1798 | |
1799 | gnu_type = make_node (RECORD_TYPE); | |
1800 | TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "PAD"); | |
a1ab4c31 | 1801 | TYPE_PACKED (gnu_type) = 1; |
b1fa9126 EB |
1802 | TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_field_type); |
1803 | TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_field_type); | |
1804 | SET_TYPE_ADA_SIZE (gnu_type, TYPE_RM_SIZE (gnu_field_type)); | |
1805 | TYPE_ALIGN (gnu_type) = align; | |
1806 | relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY); | |
a1ab4c31 | 1807 | |
40d1f6af EB |
1808 | /* Don't declare the field as addressable since we won't be taking |
1809 | its address and this would prevent create_field_decl from making | |
1810 | a bitfield. */ | |
da01bfee EB |
1811 | gnu_field |
1812 | = create_field_decl (get_identifier ("F"), gnu_field_type, | |
1813 | gnu_type, NULL_TREE, bitsize_zero_node, 1, 0); | |
a1ab4c31 | 1814 | |
b1fa9126 EB |
1815 | finish_record_type (gnu_type, gnu_field, 2, debug_info_p); |
1816 | compute_record_mode (gnu_type); | |
315cff15 | 1817 | TYPE_PADDING_P (gnu_type) = 1; |
a1ab4c31 AC |
1818 | } |
1819 | ||
a1ab4c31 AC |
1820 | break; |
1821 | ||
1822 | case E_Floating_Point_Type: | |
1823 | /* If this is a VAX floating-point type, use an integer of the proper | |
1824 | size. All the operations will be handled with ASM statements. */ | |
1825 | if (Vax_Float (gnat_entity)) | |
1826 | { | |
1827 | gnu_type = make_signed_type (esize); | |
1828 | TYPE_VAX_FLOATING_POINT_P (gnu_type) = 1; | |
1829 | SET_TYPE_DIGITS_VALUE (gnu_type, | |
1830 | UI_To_gnu (Digits_Value (gnat_entity), | |
1831 | sizetype)); | |
1832 | break; | |
1833 | } | |
1834 | ||
1835 | /* The type of the Low and High bounds can be our type if this is | |
1836 | a type from Standard, so set them at the end of the function. */ | |
1837 | gnu_type = make_node (REAL_TYPE); | |
1838 | TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize); | |
1839 | layout_type (gnu_type); | |
1840 | break; | |
1841 | ||
1842 | case E_Floating_Point_Subtype: | |
1843 | if (Vax_Float (gnat_entity)) | |
1844 | { | |
1845 | gnu_type = gnat_to_gnu_type (Etype (gnat_entity)); | |
1846 | break; | |
1847 | } | |
1848 | ||
1849 | { | |
1850 | if (!definition | |
1851 | && Present (Ancestor_Subtype (gnat_entity)) | |
1852 | && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity)) | |
1853 | && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity)) | |
1854 | || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity)))) | |
1855 | gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity), | |
1856 | gnu_expr, 0); | |
1857 | ||
1858 | gnu_type = make_node (REAL_TYPE); | |
1859 | TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity)); | |
1860 | TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize); | |
84fb43a1 EB |
1861 | TYPE_GCC_MIN_VALUE (gnu_type) |
1862 | = TYPE_GCC_MIN_VALUE (TREE_TYPE (gnu_type)); | |
1863 | TYPE_GCC_MAX_VALUE (gnu_type) | |
1864 | = TYPE_GCC_MAX_VALUE (TREE_TYPE (gnu_type)); | |
1865 | layout_type (gnu_type); | |
a1ab4c31 | 1866 | |
84fb43a1 EB |
1867 | SET_TYPE_RM_MIN_VALUE |
1868 | (gnu_type, | |
1869 | convert (TREE_TYPE (gnu_type), | |
1870 | elaborate_expression (Type_Low_Bound (gnat_entity), | |
1871 | gnat_entity, get_identifier ("L"), | |
1872 | definition, true, | |
1873 | Needs_Debug_Info (gnat_entity)))); | |
1874 | ||
1875 | SET_TYPE_RM_MAX_VALUE | |
1876 | (gnu_type, | |
1877 | convert (TREE_TYPE (gnu_type), | |
1878 | elaborate_expression (Type_High_Bound (gnat_entity), | |
1879 | gnat_entity, get_identifier ("U"), | |
1880 | definition, true, | |
1881 | Needs_Debug_Info (gnat_entity)))); | |
a1ab4c31 AC |
1882 | |
1883 | /* One of the above calls might have caused us to be elaborated, | |
1884 | so don't blow up if so. */ | |
1885 | if (present_gnu_tree (gnat_entity)) | |
1886 | { | |
1887 | maybe_present = true; | |
1888 | break; | |
1889 | } | |
1890 | ||
a1ab4c31 AC |
1891 | /* Inherit our alias set from what we're a subtype of, as for |
1892 | integer subtypes. */ | |
794511d2 | 1893 | relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY); |
a1ab4c31 AC |
1894 | } |
1895 | break; | |
1896 | ||
1897 | /* Array and String Types and Subtypes | |
1898 | ||
1899 | Unconstrained array types are represented by E_Array_Type and | |
1900 | constrained array types are represented by E_Array_Subtype. There | |
1901 | are no actual objects of an unconstrained array type; all we have | |
1902 | are pointers to that type. | |
1903 | ||
1904 | The following fields are defined on array types and subtypes: | |
1905 | ||
1906 | Component_Type Component type of the array. | |
1907 | Number_Dimensions Number of dimensions (an int). | |
1908 | First_Index Type of first index. */ | |
1909 | ||
1910 | case E_String_Type: | |
1911 | case E_Array_Type: | |
1912 | { | |
4e6602a8 EB |
1913 | const bool convention_fortran_p |
1914 | = (Convention (gnat_entity) == Convention_Fortran); | |
1915 | const int ndim = Number_Dimensions (gnat_entity); | |
26383c64 | 1916 | tree gnu_template_type = make_node (RECORD_TYPE); |
26383c64 | 1917 | tree gnu_ptr_template = build_pointer_type (gnu_template_type); |
e3edbd56 | 1918 | tree gnu_template_reference, gnu_template_fields, gnu_fat_type; |
2bb1fc26 NF |
1919 | tree *gnu_index_types = XALLOCAVEC (tree, ndim); |
1920 | tree *gnu_temp_fields = XALLOCAVEC (tree, ndim); | |
e3edbd56 EB |
1921 | tree gnu_max_size = size_one_node, gnu_max_size_unit, tem, t; |
1922 | Entity_Id gnat_index, gnat_name; | |
4e6602a8 | 1923 | int index; |
a1ab4c31 | 1924 | |
e3edbd56 EB |
1925 | /* We complete an existing dummy fat pointer type in place. This both |
1926 | avoids further complex adjustments in update_pointer_to and yields | |
1927 | better debugging information in DWARF by leveraging the support for | |
1928 | incomplete declarations of "tagged" types in the DWARF back-end. */ | |
1929 | gnu_type = get_dummy_type (gnat_entity); | |
1930 | if (gnu_type && TYPE_POINTER_TO (gnu_type)) | |
1931 | { | |
1932 | gnu_fat_type = TYPE_MAIN_VARIANT (TYPE_POINTER_TO (gnu_type)); | |
1933 | TYPE_NAME (gnu_fat_type) = NULL_TREE; | |
1934 | /* Save the contents of the dummy type for update_pointer_to. */ | |
1935 | TYPE_POINTER_TO (gnu_type) = copy_type (gnu_fat_type); | |
1936 | } | |
1937 | else | |
1938 | gnu_fat_type = make_node (RECORD_TYPE); | |
a1ab4c31 AC |
1939 | |
1940 | /* Make a node for the array. If we are not defining the array | |
1941 | suppress expanding incomplete types. */ | |
1942 | gnu_type = make_node (UNCONSTRAINED_ARRAY_TYPE); | |
1943 | ||
1944 | if (!definition) | |
8cd28148 EB |
1945 | { |
1946 | defer_incomplete_level++; | |
1947 | this_deferred = true; | |
1948 | } | |
a1ab4c31 AC |
1949 | |
1950 | /* Build the fat pointer type. Use a "void *" object instead of | |
1951 | a pointer to the array type since we don't have the array type | |
1952 | yet (it will reference the fat pointer via the bounds). */ | |
98cd3025 EB |
1953 | tem |
1954 | = create_field_decl (get_identifier ("P_ARRAY"), ptr_void_type_node, | |
1955 | gnu_fat_type, NULL_TREE, NULL_TREE, 0, 0); | |
e3edbd56 | 1956 | DECL_CHAIN (tem) |
98cd3025 EB |
1957 | = create_field_decl (get_identifier ("P_BOUNDS"), gnu_ptr_template, |
1958 | gnu_fat_type, NULL_TREE, NULL_TREE, 0, 0); | |
e3edbd56 EB |
1959 | |
1960 | if (COMPLETE_TYPE_P (gnu_fat_type)) | |
1961 | { | |
1962 | /* We are going to lay it out again so reset the alias set. */ | |
1963 | alias_set_type alias_set = TYPE_ALIAS_SET (gnu_fat_type); | |
1964 | TYPE_ALIAS_SET (gnu_fat_type) = -1; | |
1965 | finish_fat_pointer_type (gnu_fat_type, tem); | |
1966 | TYPE_ALIAS_SET (gnu_fat_type) = alias_set; | |
1967 | for (t = gnu_fat_type; t; t = TYPE_NEXT_VARIANT (t)) | |
1968 | { | |
1969 | TYPE_FIELDS (t) = tem; | |
1970 | SET_TYPE_UNCONSTRAINED_ARRAY (t, gnu_type); | |
1971 | } | |
1972 | } | |
1973 | else | |
1974 | { | |
1975 | finish_fat_pointer_type (gnu_fat_type, tem); | |
1976 | SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type, gnu_type); | |
1977 | } | |
a1ab4c31 AC |
1978 | |
1979 | /* Build a reference to the template from a PLACEHOLDER_EXPR that | |
1980 | is the fat pointer. This will be used to access the individual | |
1981 | fields once we build them. */ | |
1982 | tem = build3 (COMPONENT_REF, gnu_ptr_template, | |
1983 | build0 (PLACEHOLDER_EXPR, gnu_fat_type), | |
910ad8de | 1984 | DECL_CHAIN (TYPE_FIELDS (gnu_fat_type)), NULL_TREE); |
a1ab4c31 AC |
1985 | gnu_template_reference |
1986 | = build_unary_op (INDIRECT_REF, gnu_template_type, tem); | |
1987 | TREE_READONLY (gnu_template_reference) = 1; | |
1988 | ||
4e6602a8 EB |
1989 | /* Now create the GCC type for each index and add the fields for that |
1990 | index to the template. */ | |
1991 | for (index = (convention_fortran_p ? ndim - 1 : 0), | |
1992 | gnat_index = First_Index (gnat_entity); | |
1993 | 0 <= index && index < ndim; | |
1994 | index += (convention_fortran_p ? - 1 : 1), | |
1995 | gnat_index = Next_Index (gnat_index)) | |
a1ab4c31 | 1996 | { |
4e6602a8 EB |
1997 | char field_name[16]; |
1998 | tree gnu_index_base_type | |
1999 | = get_unpadded_type (Base_Type (Etype (gnat_index))); | |
b6c056fe EB |
2000 | tree gnu_lb_field, gnu_hb_field, gnu_orig_min, gnu_orig_max; |
2001 | tree gnu_min, gnu_max, gnu_high; | |
4e6602a8 EB |
2002 | |
2003 | /* Make the FIELD_DECLs for the low and high bounds of this | |
2004 | type and then make extractions of these fields from the | |
a1ab4c31 AC |
2005 | template. */ |
2006 | sprintf (field_name, "LB%d", index); | |
b6c056fe EB |
2007 | gnu_lb_field = create_field_decl (get_identifier (field_name), |
2008 | gnu_index_base_type, | |
da01bfee EB |
2009 | gnu_template_type, NULL_TREE, |
2010 | NULL_TREE, 0, 0); | |
a1ab4c31 | 2011 | Sloc_to_locus (Sloc (gnat_entity), |
b6c056fe | 2012 | &DECL_SOURCE_LOCATION (gnu_lb_field)); |
4e6602a8 EB |
2013 | |
2014 | field_name[0] = 'U'; | |
b6c056fe EB |
2015 | gnu_hb_field = create_field_decl (get_identifier (field_name), |
2016 | gnu_index_base_type, | |
da01bfee EB |
2017 | gnu_template_type, NULL_TREE, |
2018 | NULL_TREE, 0, 0); | |
a1ab4c31 | 2019 | Sloc_to_locus (Sloc (gnat_entity), |
b6c056fe | 2020 | &DECL_SOURCE_LOCATION (gnu_hb_field)); |
a1ab4c31 | 2021 | |
b6c056fe | 2022 | gnu_temp_fields[index] = chainon (gnu_lb_field, gnu_hb_field); |
4e6602a8 EB |
2023 | |
2024 | /* We can't use build_component_ref here since the template type | |
2025 | isn't complete yet. */ | |
b6c056fe EB |
2026 | gnu_orig_min = build3 (COMPONENT_REF, gnu_index_base_type, |
2027 | gnu_template_reference, gnu_lb_field, | |
2028 | NULL_TREE); | |
2029 | gnu_orig_max = build3 (COMPONENT_REF, gnu_index_base_type, | |
2030 | gnu_template_reference, gnu_hb_field, | |
2031 | NULL_TREE); | |
2032 | TREE_READONLY (gnu_orig_min) = TREE_READONLY (gnu_orig_max) = 1; | |
2033 | ||
2034 | gnu_min = convert (sizetype, gnu_orig_min); | |
2035 | gnu_max = convert (sizetype, gnu_orig_max); | |
2036 | ||
2037 | /* Compute the size of this dimension. See the E_Array_Subtype | |
2038 | case below for the rationale. */ | |
2039 | gnu_high | |
2040 | = build3 (COND_EXPR, sizetype, | |
2041 | build2 (GE_EXPR, boolean_type_node, | |
2042 | gnu_orig_max, gnu_orig_min), | |
2043 | gnu_max, | |
2044 | size_binop (MINUS_EXPR, gnu_min, size_one_node)); | |
03b6f8a2 | 2045 | |
4e6602a8 | 2046 | /* Make a range type with the new range in the Ada base type. |
03b6f8a2 | 2047 | Then make an index type with the size range in sizetype. */ |
a1ab4c31 | 2048 | gnu_index_types[index] |
b6c056fe | 2049 | = create_index_type (gnu_min, gnu_high, |
4e6602a8 | 2050 | create_range_type (gnu_index_base_type, |
b6c056fe EB |
2051 | gnu_orig_min, |
2052 | gnu_orig_max), | |
a1ab4c31 | 2053 | gnat_entity); |
4e6602a8 EB |
2054 | |
2055 | /* Update the maximum size of the array in elements. */ | |
2056 | if (gnu_max_size) | |
2057 | { | |
2058 | tree gnu_index_type = get_unpadded_type (Etype (gnat_index)); | |
2059 | tree gnu_min | |
2060 | = convert (sizetype, TYPE_MIN_VALUE (gnu_index_type)); | |
2061 | tree gnu_max | |
2062 | = convert (sizetype, TYPE_MAX_VALUE (gnu_index_type)); | |
2063 | tree gnu_this_max | |
2064 | = size_binop (MAX_EXPR, | |
2065 | size_binop (PLUS_EXPR, size_one_node, | |
2066 | size_binop (MINUS_EXPR, | |
2067 | gnu_max, gnu_min)), | |
2068 | size_zero_node); | |
2069 | ||
2070 | if (TREE_CODE (gnu_this_max) == INTEGER_CST | |
2071 | && TREE_OVERFLOW (gnu_this_max)) | |
2072 | gnu_max_size = NULL_TREE; | |
2073 | else | |
2074 | gnu_max_size | |
2075 | = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max); | |
2076 | } | |
a1ab4c31 AC |
2077 | |
2078 | TYPE_NAME (gnu_index_types[index]) | |
2079 | = create_concat_name (gnat_entity, field_name); | |
2080 | } | |
2081 | ||
e3edbd56 EB |
2082 | /* Install all the fields into the template. */ |
2083 | TYPE_NAME (gnu_template_type) | |
2084 | = create_concat_name (gnat_entity, "XUB"); | |
2085 | gnu_template_fields = NULL_TREE; | |
a1ab4c31 AC |
2086 | for (index = 0; index < ndim; index++) |
2087 | gnu_template_fields | |
2088 | = chainon (gnu_template_fields, gnu_temp_fields[index]); | |
032d1b71 EB |
2089 | finish_record_type (gnu_template_type, gnu_template_fields, 0, |
2090 | debug_info_p); | |
a1ab4c31 AC |
2091 | TYPE_READONLY (gnu_template_type) = 1; |
2092 | ||
2093 | /* Now make the array of arrays and update the pointer to the array | |
2094 | in the fat pointer. Note that it is the first field. */ | |
e3edbd56 EB |
2095 | tem |
2096 | = gnat_to_gnu_component_type (gnat_entity, definition, debug_info_p); | |
a1ab4c31 AC |
2097 | |
2098 | /* If Component_Size is not already specified, annotate it with the | |
2099 | size of the component. */ | |
2100 | if (Unknown_Component_Size (gnat_entity)) | |
2101 | Set_Component_Size (gnat_entity, annotate_value (TYPE_SIZE (tem))); | |
2102 | ||
4e6602a8 EB |
2103 | /* Compute the maximum size of the array in units and bits. */ |
2104 | if (gnu_max_size) | |
2105 | { | |
2106 | gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size, | |
2107 | TYPE_SIZE_UNIT (tem)); | |
2108 | gnu_max_size = size_binop (MULT_EXPR, | |
2109 | convert (bitsizetype, gnu_max_size), | |
2110 | TYPE_SIZE (tem)); | |
2111 | } | |
2112 | else | |
2113 | gnu_max_size_unit = NULL_TREE; | |
a1ab4c31 | 2114 | |
4e6602a8 | 2115 | /* Now build the array type. */ |
a1ab4c31 AC |
2116 | for (index = ndim - 1; index >= 0; index--) |
2117 | { | |
523e82a7 | 2118 | tem = build_nonshared_array_type (tem, gnu_index_types[index]); |
a1ab4c31 | 2119 | TYPE_MULTI_ARRAY_P (tem) = (index > 0); |
d8e94f79 | 2120 | if (array_type_has_nonaliased_component (tem, gnat_entity)) |
a1ab4c31 AC |
2121 | TYPE_NONALIASED_COMPONENT (tem) = 1; |
2122 | } | |
2123 | ||
feec4372 EB |
2124 | /* If an alignment is specified, use it if valid. But ignore it |
2125 | for the original type of packed array types. If the alignment | |
2126 | was requested with an explicit alignment clause, state so. */ | |
a1ab4c31 AC |
2127 | if (No (Packed_Array_Type (gnat_entity)) |
2128 | && Known_Alignment (gnat_entity)) | |
2129 | { | |
a1ab4c31 AC |
2130 | TYPE_ALIGN (tem) |
2131 | = validate_alignment (Alignment (gnat_entity), gnat_entity, | |
2132 | TYPE_ALIGN (tem)); | |
2133 | if (Present (Alignment_Clause (gnat_entity))) | |
2134 | TYPE_USER_ALIGN (tem) = 1; | |
2135 | } | |
2136 | ||
4e6602a8 | 2137 | TYPE_CONVENTION_FORTRAN_P (tem) = convention_fortran_p; |
e3edbd56 EB |
2138 | |
2139 | /* Adjust the type of the pointer-to-array field of the fat pointer | |
2140 | and record the aliasing relationships if necessary. */ | |
a1ab4c31 | 2141 | TREE_TYPE (TYPE_FIELDS (gnu_fat_type)) = build_pointer_type (tem); |
e3edbd56 EB |
2142 | if (TYPE_ALIAS_SET_KNOWN_P (gnu_fat_type)) |
2143 | record_component_aliases (gnu_fat_type); | |
a1ab4c31 AC |
2144 | |
2145 | /* The result type is an UNCONSTRAINED_ARRAY_TYPE that indicates the | |
2146 | corresponding fat pointer. */ | |
e3edbd56 EB |
2147 | TREE_TYPE (gnu_type) = gnu_fat_type; |
2148 | TYPE_POINTER_TO (gnu_type) = gnu_fat_type; | |
2149 | TYPE_REFERENCE_TO (gnu_type) = gnu_fat_type; | |
6f9f0ce3 | 2150 | SET_TYPE_MODE (gnu_type, BLKmode); |
a1ab4c31 | 2151 | TYPE_ALIGN (gnu_type) = TYPE_ALIGN (tem); |
a1ab4c31 AC |
2152 | |
2153 | /* If the maximum size doesn't overflow, use it. */ | |
86060344 | 2154 | if (gnu_max_size |
4e6602a8 EB |
2155 | && TREE_CODE (gnu_max_size) == INTEGER_CST |
2156 | && !TREE_OVERFLOW (gnu_max_size) | |
2157 | && TREE_CODE (gnu_max_size_unit) == INTEGER_CST | |
a1ab4c31 | 2158 | && !TREE_OVERFLOW (gnu_max_size_unit)) |
4e6602a8 EB |
2159 | { |
2160 | TYPE_SIZE (tem) = size_binop (MIN_EXPR, gnu_max_size, | |
2161 | TYPE_SIZE (tem)); | |
2162 | TYPE_SIZE_UNIT (tem) = size_binop (MIN_EXPR, gnu_max_size_unit, | |
2163 | TYPE_SIZE_UNIT (tem)); | |
2164 | } | |
a1ab4c31 AC |
2165 | |
2166 | create_type_decl (create_concat_name (gnat_entity, "XUA"), | |
2167 | tem, NULL, !Comes_From_Source (gnat_entity), | |
2168 | debug_info_p, gnat_entity); | |
2169 | ||
40c88b94 EB |
2170 | /* Give the fat pointer type a name. If this is a packed type, tell |
2171 | the debugger how to interpret the underlying bits. */ | |
2172 | if (Present (Packed_Array_Type (gnat_entity))) | |
2173 | gnat_name = Packed_Array_Type (gnat_entity); | |
2174 | else | |
2175 | gnat_name = gnat_entity; | |
2176 | create_type_decl (create_concat_name (gnat_name, "XUP"), | |
583eb0c9 | 2177 | gnu_fat_type, NULL, !Comes_From_Source (gnat_entity), |
a1ab4c31 AC |
2178 | debug_info_p, gnat_entity); |
2179 | ||
86060344 EB |
2180 | /* Create the type to be used as what a thin pointer designates: |
2181 | a record type for the object and its template with the fields | |
2182 | shifted to have the template at a negative offset. */ | |
a1ab4c31 | 2183 | tem = build_unc_object_type (gnu_template_type, tem, |
928dfa4b EB |
2184 | create_concat_name (gnat_name, "XUT"), |
2185 | debug_info_p); | |
a1ab4c31 AC |
2186 | shift_unc_components_for_thin_pointers (tem); |
2187 | ||
2188 | SET_TYPE_UNCONSTRAINED_ARRAY (tem, gnu_type); | |
2189 | TYPE_OBJECT_RECORD_TYPE (gnu_type) = tem; | |
a1ab4c31 AC |
2190 | } |
2191 | break; | |
2192 | ||
2193 | case E_String_Subtype: | |
2194 | case E_Array_Subtype: | |
2195 | ||
2196 | /* This is the actual data type for array variables. Multidimensional | |
4e6602a8 | 2197 | arrays are implemented as arrays of arrays. Note that arrays which |
7c20033e | 2198 | have sparse enumeration subtypes as index components create sparse |
4e6602a8 EB |
2199 | arrays, which is obviously space inefficient but so much easier to |
2200 | code for now. | |
a1ab4c31 | 2201 | |
4e6602a8 EB |
2202 | Also note that the subtype never refers to the unconstrained array |
2203 | type, which is somewhat at variance with Ada semantics. | |
a1ab4c31 | 2204 | |
4e6602a8 EB |
2205 | First check to see if this is simply a renaming of the array type. |
2206 | If so, the result is the array type. */ | |
a1ab4c31 AC |
2207 | |
2208 | gnu_type = gnat_to_gnu_type (Etype (gnat_entity)); | |
2209 | if (!Is_Constrained (gnat_entity)) | |
7c20033e | 2210 | ; |
a1ab4c31 AC |
2211 | else |
2212 | { | |
4e6602a8 EB |
2213 | Entity_Id gnat_index, gnat_base_index; |
2214 | const bool convention_fortran_p | |
2215 | = (Convention (gnat_entity) == Convention_Fortran); | |
2216 | const int ndim = Number_Dimensions (gnat_entity); | |
a1ab4c31 | 2217 | tree gnu_base_type = gnu_type; |
2bb1fc26 | 2218 | tree *gnu_index_types = XALLOCAVEC (tree, ndim); |
26383c64 | 2219 | tree gnu_max_size = size_one_node, gnu_max_size_unit; |
a1ab4c31 | 2220 | bool need_index_type_struct = false; |
4e6602a8 | 2221 | int index; |
a1ab4c31 | 2222 | |
4e6602a8 EB |
2223 | /* First create the GCC type for each index and find out whether |
2224 | special types are needed for debugging information. */ | |
2225 | for (index = (convention_fortran_p ? ndim - 1 : 0), | |
2226 | gnat_index = First_Index (gnat_entity), | |
2227 | gnat_base_index | |
a1ab4c31 | 2228 | = First_Index (Implementation_Base_Type (gnat_entity)); |
4e6602a8 EB |
2229 | 0 <= index && index < ndim; |
2230 | index += (convention_fortran_p ? - 1 : 1), | |
2231 | gnat_index = Next_Index (gnat_index), | |
2232 | gnat_base_index = Next_Index (gnat_base_index)) | |
a1ab4c31 | 2233 | { |
4e6602a8 EB |
2234 | tree gnu_index_type = get_unpadded_type (Etype (gnat_index)); |
2235 | tree gnu_orig_min = TYPE_MIN_VALUE (gnu_index_type); | |
2236 | tree gnu_orig_max = TYPE_MAX_VALUE (gnu_index_type); | |
2237 | tree gnu_min = convert (sizetype, gnu_orig_min); | |
2238 | tree gnu_max = convert (sizetype, gnu_orig_max); | |
2239 | tree gnu_base_index_type | |
2240 | = get_unpadded_type (Etype (gnat_base_index)); | |
2241 | tree gnu_base_orig_min = TYPE_MIN_VALUE (gnu_base_index_type); | |
2242 | tree gnu_base_orig_max = TYPE_MAX_VALUE (gnu_base_index_type); | |
728936bb | 2243 | tree gnu_high; |
4e6602a8 EB |
2244 | |
2245 | /* See if the base array type is already flat. If it is, we | |
2246 | are probably compiling an ACATS test but it will cause the | |
2247 | code below to malfunction if we don't handle it specially. */ | |
2248 | if (TREE_CODE (gnu_base_orig_min) == INTEGER_CST | |
2249 | && TREE_CODE (gnu_base_orig_max) == INTEGER_CST | |
2250 | && tree_int_cst_lt (gnu_base_orig_max, gnu_base_orig_min)) | |
a1ab4c31 | 2251 | { |
4e6602a8 EB |
2252 | gnu_min = size_one_node; |
2253 | gnu_max = size_zero_node; | |
feec4372 | 2254 | gnu_high = gnu_max; |
a1ab4c31 AC |
2255 | } |
2256 | ||
4e6602a8 EB |
2257 | /* Similarly, if one of the values overflows in sizetype and the |
2258 | range is null, use 1..0 for the sizetype bounds. */ | |
728936bb | 2259 | else if (TREE_CODE (gnu_min) == INTEGER_CST |
a1ab4c31 AC |
2260 | && TREE_CODE (gnu_max) == INTEGER_CST |
2261 | && (TREE_OVERFLOW (gnu_min) || TREE_OVERFLOW (gnu_max)) | |
4e6602a8 | 2262 | && tree_int_cst_lt (gnu_orig_max, gnu_orig_min)) |
feec4372 EB |
2263 | { |
2264 | gnu_min = size_one_node; | |
2265 | gnu_max = size_zero_node; | |
2266 | gnu_high = gnu_max; | |
2267 | } | |
a1ab4c31 | 2268 | |
4e6602a8 EB |
2269 | /* If the minimum and maximum values both overflow in sizetype, |
2270 | but the difference in the original type does not overflow in | |
2271 | sizetype, ignore the overflow indication. */ | |
728936bb | 2272 | else if (TREE_CODE (gnu_min) == INTEGER_CST |
4e6602a8 EB |
2273 | && TREE_CODE (gnu_max) == INTEGER_CST |
2274 | && TREE_OVERFLOW (gnu_min) && TREE_OVERFLOW (gnu_max) | |
2275 | && !TREE_OVERFLOW | |
2276 | (convert (sizetype, | |
2277 | fold_build2 (MINUS_EXPR, gnu_index_type, | |
2278 | gnu_orig_max, | |
2279 | gnu_orig_min)))) | |
feec4372 | 2280 | { |
4e6602a8 EB |
2281 | TREE_OVERFLOW (gnu_min) = 0; |
2282 | TREE_OVERFLOW (gnu_max) = 0; | |
feec4372 EB |
2283 | gnu_high = gnu_max; |
2284 | } | |
2285 | ||
f45f9664 EB |
2286 | /* Compute the size of this dimension in the general case. We |
2287 | need to provide GCC with an upper bound to use but have to | |
2288 | deal with the "superflat" case. There are three ways to do | |
2289 | this. If we can prove that the array can never be superflat, | |
2290 | we can just use the high bound of the index type. */ | |
728936bb EB |
2291 | else if ((Nkind (gnat_index) == N_Range |
2292 | && cannot_be_superflat_p (gnat_index)) | |
2293 | /* Packed Array Types are never superflat. */ | |
2294 | || Is_Packed_Array_Type (gnat_entity)) | |
f45f9664 EB |
2295 | gnu_high = gnu_max; |
2296 | ||
728936bb EB |
2297 | /* Otherwise, if the high bound is constant but the low bound is |
2298 | not, we use the expression (hb >= lb) ? lb : hb + 1 for the | |
2299 | lower bound. Note that the comparison must be done in the | |
2300 | original type to avoid any overflow during the conversion. */ | |
2301 | else if (TREE_CODE (gnu_max) == INTEGER_CST | |
2302 | && TREE_CODE (gnu_min) != INTEGER_CST) | |
feec4372 | 2303 | { |
728936bb EB |
2304 | gnu_high = gnu_max; |
2305 | gnu_min | |
2306 | = build_cond_expr (sizetype, | |
2307 | build_binary_op (GE_EXPR, | |
2308 | boolean_type_node, | |
2309 | gnu_orig_max, | |
2310 | gnu_orig_min), | |
2311 | gnu_min, | |
2312 | size_binop (PLUS_EXPR, gnu_max, | |
2313 | size_one_node)); | |
feec4372 | 2314 | } |
a1ab4c31 | 2315 | |
728936bb EB |
2316 | /* Finally we use (hb >= lb) ? hb : lb - 1 for the upper bound |
2317 | in all the other cases. Note that, here as well as above, | |
2318 | the condition used in the comparison must be equivalent to | |
2319 | the condition (length != 0). This is relied upon in order | |
2320 | to optimize array comparisons in compare_arrays. */ | |
2321 | else | |
2322 | gnu_high | |
2323 | = build_cond_expr (sizetype, | |
2324 | build_binary_op (GE_EXPR, | |
2325 | boolean_type_node, | |
2326 | gnu_orig_max, | |
2327 | gnu_orig_min), | |
2328 | gnu_max, | |
2329 | size_binop (MINUS_EXPR, gnu_min, | |
2330 | size_one_node)); | |
2331 | ||
b6c056fe EB |
2332 | /* Reuse the index type for the range type. Then make an index |
2333 | type with the size range in sizetype. */ | |
4e6602a8 EB |
2334 | gnu_index_types[index] |
2335 | = create_index_type (gnu_min, gnu_high, gnu_index_type, | |
a1ab4c31 AC |
2336 | gnat_entity); |
2337 | ||
4e6602a8 | 2338 | /* Update the maximum size of the array in elements. Here we |
a1ab4c31 | 2339 | see if any constraint on the index type of the base type |
4e6602a8 EB |
2340 | can be used in the case of self-referential bound on the |
2341 | index type of the subtype. We look for a non-"infinite" | |
a1ab4c31 AC |
2342 | and non-self-referential bound from any type involved and |
2343 | handle each bound separately. */ | |
4e6602a8 EB |
2344 | if (gnu_max_size) |
2345 | { | |
2346 | tree gnu_base_min = convert (sizetype, gnu_base_orig_min); | |
2347 | tree gnu_base_max = convert (sizetype, gnu_base_orig_max); | |
2348 | tree gnu_base_index_base_type | |
2349 | = get_base_type (gnu_base_index_type); | |
2350 | tree gnu_base_base_min | |
2351 | = convert (sizetype, | |
2352 | TYPE_MIN_VALUE (gnu_base_index_base_type)); | |
2353 | tree gnu_base_base_max | |
2354 | = convert (sizetype, | |
2355 | TYPE_MAX_VALUE (gnu_base_index_base_type)); | |
2356 | ||
2357 | if (!CONTAINS_PLACEHOLDER_P (gnu_min) | |
2358 | || !(TREE_CODE (gnu_base_min) == INTEGER_CST | |
2359 | && !TREE_OVERFLOW (gnu_base_min))) | |
2360 | gnu_base_min = gnu_min; | |
2361 | ||
2362 | if (!CONTAINS_PLACEHOLDER_P (gnu_max) | |
2363 | || !(TREE_CODE (gnu_base_max) == INTEGER_CST | |
2364 | && !TREE_OVERFLOW (gnu_base_max))) | |
2365 | gnu_base_max = gnu_max; | |
2366 | ||
2367 | if ((TREE_CODE (gnu_base_min) == INTEGER_CST | |
2368 | && TREE_OVERFLOW (gnu_base_min)) | |
2369 | || operand_equal_p (gnu_base_min, gnu_base_base_min, 0) | |
2370 | || (TREE_CODE (gnu_base_max) == INTEGER_CST | |
2371 | && TREE_OVERFLOW (gnu_base_max)) | |
2372 | || operand_equal_p (gnu_base_max, gnu_base_base_max, 0)) | |
2373 | gnu_max_size = NULL_TREE; | |
2374 | else | |
2375 | { | |
2376 | tree gnu_this_max | |
2377 | = size_binop (MAX_EXPR, | |
2378 | size_binop (PLUS_EXPR, size_one_node, | |
2379 | size_binop (MINUS_EXPR, | |
2380 | gnu_base_max, | |
2381 | gnu_base_min)), | |
2382 | size_zero_node); | |
2383 | ||
2384 | if (TREE_CODE (gnu_this_max) == INTEGER_CST | |
2385 | && TREE_OVERFLOW (gnu_this_max)) | |
2386 | gnu_max_size = NULL_TREE; | |
2387 | else | |
2388 | gnu_max_size | |
2389 | = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max); | |
2390 | } | |
2391 | } | |
a1ab4c31 | 2392 | |
4e6602a8 EB |
2393 | /* We need special types for debugging information to point to |
2394 | the index types if they have variable bounds, are not integer | |
2395 | types, are biased or are wider than sizetype. */ | |
2396 | if (!integer_onep (gnu_orig_min) | |
2397 | || TREE_CODE (gnu_orig_max) != INTEGER_CST | |
2398 | || TREE_CODE (gnu_index_type) != INTEGER_TYPE | |
2399 | || (TREE_TYPE (gnu_index_type) | |
2400 | && TREE_CODE (TREE_TYPE (gnu_index_type)) | |
2401 | != INTEGER_TYPE) | |
2402 | || TYPE_BIASED_REPRESENTATION_P (gnu_index_type) | |
728936bb EB |
2403 | || compare_tree_int (rm_size (gnu_index_type), |
2404 | TYPE_PRECISION (sizetype)) > 0) | |
a1ab4c31 AC |
2405 | need_index_type_struct = true; |
2406 | } | |
2407 | ||
2408 | /* Then flatten: create the array of arrays. For an array type | |
2409 | used to implement a packed array, get the component type from | |
2410 | the original array type since the representation clauses that | |
2411 | can affect it are on the latter. */ | |
2412 | if (Is_Packed_Array_Type (gnat_entity) | |
2413 | && !Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))) | |
2414 | { | |
2415 | gnu_type = gnat_to_gnu_type (Original_Array_Type (gnat_entity)); | |
4e6602a8 | 2416 | for (index = ndim - 1; index >= 0; index--) |
a1ab4c31 AC |
2417 | gnu_type = TREE_TYPE (gnu_type); |
2418 | ||
2419 | /* One of the above calls might have caused us to be elaborated, | |
2420 | so don't blow up if so. */ | |
2421 | if (present_gnu_tree (gnat_entity)) | |
2422 | { | |
2423 | maybe_present = true; | |
2424 | break; | |
2425 | } | |
2426 | } | |
2427 | else | |
2428 | { | |
2cac6017 EB |
2429 | gnu_type = gnat_to_gnu_component_type (gnat_entity, definition, |
2430 | debug_info_p); | |
a1ab4c31 AC |
2431 | |
2432 | /* One of the above calls might have caused us to be elaborated, | |
2433 | so don't blow up if so. */ | |
2434 | if (present_gnu_tree (gnat_entity)) | |
2435 | { | |
2436 | maybe_present = true; | |
2437 | break; | |
2438 | } | |
a1ab4c31 AC |
2439 | } |
2440 | ||
4e6602a8 EB |
2441 | /* Compute the maximum size of the array in units and bits. */ |
2442 | if (gnu_max_size) | |
2443 | { | |
2444 | gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size, | |
2445 | TYPE_SIZE_UNIT (gnu_type)); | |
2446 | gnu_max_size = size_binop (MULT_EXPR, | |
2447 | convert (bitsizetype, gnu_max_size), | |
2448 | TYPE_SIZE (gnu_type)); | |
2449 | } | |
2450 | else | |
2451 | gnu_max_size_unit = NULL_TREE; | |
a1ab4c31 | 2452 | |
4e6602a8 EB |
2453 | /* Now build the array type. */ |
2454 | for (index = ndim - 1; index >= 0; index --) | |
a1ab4c31 | 2455 | { |
523e82a7 EB |
2456 | gnu_type = build_nonshared_array_type (gnu_type, |
2457 | gnu_index_types[index]); | |
a1ab4c31 | 2458 | TYPE_MULTI_ARRAY_P (gnu_type) = (index > 0); |
d8e94f79 | 2459 | if (array_type_has_nonaliased_component (gnu_type, gnat_entity)) |
a1ab4c31 AC |
2460 | TYPE_NONALIASED_COMPONENT (gnu_type) = 1; |
2461 | } | |
2462 | ||
10069d53 | 2463 | /* Attach the TYPE_STUB_DECL in case we have a parallel type. */ |
4fd78fe6 EB |
2464 | TYPE_STUB_DECL (gnu_type) |
2465 | = create_type_stub_decl (gnu_entity_name, gnu_type); | |
10069d53 | 2466 | |
4e6602a8 EB |
2467 | /* If we are at file level and this is a multi-dimensional array, |
2468 | we need to make a variable corresponding to the stride of the | |
a1ab4c31 | 2469 | inner dimensions. */ |
4e6602a8 | 2470 | if (global_bindings_p () && ndim > 1) |
a1ab4c31 | 2471 | { |
da01bfee | 2472 | tree gnu_st_name = get_identifier ("ST"); |
a1ab4c31 AC |
2473 | tree gnu_arr_type; |
2474 | ||
2475 | for (gnu_arr_type = TREE_TYPE (gnu_type); | |
2476 | TREE_CODE (gnu_arr_type) == ARRAY_TYPE; | |
2477 | gnu_arr_type = TREE_TYPE (gnu_arr_type), | |
da01bfee | 2478 | gnu_st_name = concat_name (gnu_st_name, "ST")) |
a1ab4c31 AC |
2479 | { |
2480 | tree eltype = TREE_TYPE (gnu_arr_type); | |
2481 | ||
2482 | TYPE_SIZE (gnu_arr_type) | |
a531043b | 2483 | = elaborate_expression_1 (TYPE_SIZE (gnu_arr_type), |
da01bfee | 2484 | gnat_entity, gnu_st_name, |
a531043b | 2485 | definition, false); |
a1ab4c31 AC |
2486 | |
2487 | /* ??? For now, store the size as a multiple of the | |
2488 | alignment of the element type in bytes so that we | |
2489 | can see the alignment from the tree. */ | |
2490 | TYPE_SIZE_UNIT (gnu_arr_type) | |
da01bfee EB |
2491 | = elaborate_expression_2 (TYPE_SIZE_UNIT (gnu_arr_type), |
2492 | gnat_entity, | |
2493 | concat_name (gnu_st_name, "A_U"), | |
2494 | definition, false, | |
2495 | TYPE_ALIGN (eltype)); | |
a1ab4c31 AC |
2496 | |
2497 | /* ??? create_type_decl is not invoked on the inner types so | |
2498 | the MULT_EXPR node built above will never be marked. */ | |
3f13dd77 | 2499 | MARK_VISITED (TYPE_SIZE_UNIT (gnu_arr_type)); |
a1ab4c31 AC |
2500 | } |
2501 | } | |
2502 | ||
4fd78fe6 EB |
2503 | /* If we need to write out a record type giving the names of the |
2504 | bounds for debugging purposes, do it now and make the record | |
2505 | type a parallel type. This is not needed for a packed array | |
2506 | since the bounds are conveyed by the original array type. */ | |
2507 | if (need_index_type_struct | |
2508 | && debug_info_p | |
2509 | && !Is_Packed_Array_Type (gnat_entity)) | |
a1ab4c31 | 2510 | { |
10069d53 | 2511 | tree gnu_bound_rec = make_node (RECORD_TYPE); |
a1ab4c31 AC |
2512 | tree gnu_field_list = NULL_TREE; |
2513 | tree gnu_field; | |
2514 | ||
10069d53 | 2515 | TYPE_NAME (gnu_bound_rec) |
a1ab4c31 AC |
2516 | = create_concat_name (gnat_entity, "XA"); |
2517 | ||
4e6602a8 | 2518 | for (index = ndim - 1; index >= 0; index--) |
a1ab4c31 | 2519 | { |
4e6602a8 | 2520 | tree gnu_index = TYPE_INDEX_TYPE (gnu_index_types[index]); |
10069d53 | 2521 | tree gnu_index_name = TYPE_NAME (gnu_index); |
a1ab4c31 | 2522 | |
10069d53 EB |
2523 | if (TREE_CODE (gnu_index_name) == TYPE_DECL) |
2524 | gnu_index_name = DECL_NAME (gnu_index_name); | |
a1ab4c31 | 2525 | |
4fd78fe6 EB |
2526 | /* Make sure to reference the types themselves, and not just |
2527 | their names, as the debugger may fall back on them. */ | |
10069d53 | 2528 | gnu_field = create_field_decl (gnu_index_name, gnu_index, |
da01bfee EB |
2529 | gnu_bound_rec, NULL_TREE, |
2530 | NULL_TREE, 0, 0); | |
910ad8de | 2531 | DECL_CHAIN (gnu_field) = gnu_field_list; |
a1ab4c31 AC |
2532 | gnu_field_list = gnu_field; |
2533 | } | |
2534 | ||
032d1b71 | 2535 | finish_record_type (gnu_bound_rec, gnu_field_list, 0, true); |
10069d53 | 2536 | add_parallel_type (TYPE_STUB_DECL (gnu_type), gnu_bound_rec); |
a1ab4c31 AC |
2537 | } |
2538 | ||
583eb0c9 EB |
2539 | /* If this is a packed array type, make the original array type a |
2540 | parallel type. Otherwise, do it for the base array type if it | |
2541 | isn't artificial to make sure it is kept in the debug info. */ | |
2542 | if (debug_info_p) | |
2543 | { | |
2544 | if (Is_Packed_Array_Type (gnat_entity) | |
2545 | && present_gnu_tree (Original_Array_Type (gnat_entity))) | |
2546 | add_parallel_type (TYPE_STUB_DECL (gnu_type), | |
2547 | gnat_to_gnu_type | |
2548 | (Original_Array_Type (gnat_entity))); | |
2549 | else | |
2550 | { | |
2551 | tree gnu_base_decl | |
2552 | = gnat_to_gnu_entity (Etype (gnat_entity), NULL_TREE, 0); | |
2553 | if (!DECL_ARTIFICIAL (gnu_base_decl)) | |
2554 | add_parallel_type (TYPE_STUB_DECL (gnu_type), | |
2555 | TREE_TYPE (TREE_TYPE (gnu_base_decl))); | |
2556 | } | |
2557 | } | |
4fd78fe6 | 2558 | |
4e6602a8 | 2559 | TYPE_CONVENTION_FORTRAN_P (gnu_type) = convention_fortran_p; |
a1ab4c31 AC |
2560 | TYPE_PACKED_ARRAY_TYPE_P (gnu_type) |
2561 | = (Is_Packed_Array_Type (gnat_entity) | |
2562 | && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))); | |
2563 | ||
4e6602a8 | 2564 | /* If the size is self-referential and the maximum size doesn't |
a1ab4c31 AC |
2565 | overflow, use it. */ |
2566 | if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)) | |
4e6602a8 | 2567 | && gnu_max_size |
a1ab4c31 AC |
2568 | && !(TREE_CODE (gnu_max_size) == INTEGER_CST |
2569 | && TREE_OVERFLOW (gnu_max_size)) | |
2570 | && !(TREE_CODE (gnu_max_size_unit) == INTEGER_CST | |
4e6602a8 | 2571 | && TREE_OVERFLOW (gnu_max_size_unit))) |
a1ab4c31 AC |
2572 | { |
2573 | TYPE_SIZE (gnu_type) = size_binop (MIN_EXPR, gnu_max_size, | |
2574 | TYPE_SIZE (gnu_type)); | |
2575 | TYPE_SIZE_UNIT (gnu_type) | |
2576 | = size_binop (MIN_EXPR, gnu_max_size_unit, | |
2577 | TYPE_SIZE_UNIT (gnu_type)); | |
2578 | } | |
2579 | ||
2580 | /* Set our alias set to that of our base type. This gives all | |
2581 | array subtypes the same alias set. */ | |
794511d2 | 2582 | relate_alias_sets (gnu_type, gnu_base_type, ALIAS_SET_COPY); |
a1ab4c31 | 2583 | |
7c20033e EB |
2584 | /* If this is a packed type, make this type the same as the packed |
2585 | array type, but do some adjusting in the type first. */ | |
2586 | if (Present (Packed_Array_Type (gnat_entity))) | |
a1ab4c31 | 2587 | { |
7c20033e EB |
2588 | Entity_Id gnat_index; |
2589 | tree gnu_inner; | |
2590 | ||
2591 | /* First finish the type we had been making so that we output | |
2592 | debugging information for it. */ | |
2593 | if (Treat_As_Volatile (gnat_entity)) | |
2594 | gnu_type | |
2595 | = build_qualified_type (gnu_type, | |
2596 | TYPE_QUALS (gnu_type) | |
2597 | | TYPE_QUAL_VOLATILE); | |
2598 | ||
2599 | /* Make it artificial only if the base type was artificial too. | |
2600 | That's sort of "morally" true and will make it possible for | |
2601 | the debugger to look it up by name in DWARF, which is needed | |
2602 | in order to decode the packed array type. */ | |
2603 | gnu_decl | |
2604 | = create_type_decl (gnu_entity_name, gnu_type, attr_list, | |
2605 | !Comes_From_Source (Etype (gnat_entity)) | |
2606 | && !Comes_From_Source (gnat_entity), | |
2607 | debug_info_p, gnat_entity); | |
2608 | ||
2609 | /* Save it as our equivalent in case the call below elaborates | |
2610 | this type again. */ | |
2611 | save_gnu_tree (gnat_entity, gnu_decl, false); | |
2612 | ||
2613 | gnu_decl = gnat_to_gnu_entity (Packed_Array_Type (gnat_entity), | |
2614 | NULL_TREE, 0); | |
2615 | this_made_decl = true; | |
2616 | gnu_type = TREE_TYPE (gnu_decl); | |
2617 | save_gnu_tree (gnat_entity, NULL_TREE, false); | |
2618 | ||
2619 | gnu_inner = gnu_type; | |
2620 | while (TREE_CODE (gnu_inner) == RECORD_TYPE | |
2621 | && (TYPE_JUSTIFIED_MODULAR_P (gnu_inner) | |
315cff15 | 2622 | || TYPE_PADDING_P (gnu_inner))) |
7c20033e EB |
2623 | gnu_inner = TREE_TYPE (TYPE_FIELDS (gnu_inner)); |
2624 | ||
2625 | /* We need to attach the index type to the type we just made so | |
2626 | that the actual bounds can later be put into a template. */ | |
2627 | if ((TREE_CODE (gnu_inner) == ARRAY_TYPE | |
2628 | && !TYPE_ACTUAL_BOUNDS (gnu_inner)) | |
2629 | || (TREE_CODE (gnu_inner) == INTEGER_TYPE | |
2630 | && !TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner))) | |
a1ab4c31 | 2631 | { |
7c20033e | 2632 | if (TREE_CODE (gnu_inner) == INTEGER_TYPE) |
a1ab4c31 | 2633 | { |
7c20033e EB |
2634 | /* The TYPE_ACTUAL_BOUNDS field is overloaded with the |
2635 | TYPE_MODULUS for modular types so we make an extra | |
2636 | subtype if necessary. */ | |
2637 | if (TYPE_MODULAR_P (gnu_inner)) | |
2638 | { | |
2639 | tree gnu_subtype | |
2640 | = make_unsigned_type (TYPE_PRECISION (gnu_inner)); | |
2641 | TREE_TYPE (gnu_subtype) = gnu_inner; | |
2642 | TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1; | |
2643 | SET_TYPE_RM_MIN_VALUE (gnu_subtype, | |
2644 | TYPE_MIN_VALUE (gnu_inner)); | |
2645 | SET_TYPE_RM_MAX_VALUE (gnu_subtype, | |
2646 | TYPE_MAX_VALUE (gnu_inner)); | |
2647 | gnu_inner = gnu_subtype; | |
2648 | } | |
2649 | ||
2650 | TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner) = 1; | |
26383c64 EB |
2651 | |
2652 | #ifdef ENABLE_CHECKING | |
7c20033e EB |
2653 | /* Check for other cases of overloading. */ |
2654 | gcc_assert (!TYPE_ACTUAL_BOUNDS (gnu_inner)); | |
26383c64 | 2655 | #endif |
7c20033e | 2656 | } |
a1ab4c31 | 2657 | |
7c20033e EB |
2658 | for (gnat_index = First_Index (gnat_entity); |
2659 | Present (gnat_index); | |
2660 | gnat_index = Next_Index (gnat_index)) | |
2661 | SET_TYPE_ACTUAL_BOUNDS | |
2662 | (gnu_inner, | |
2663 | tree_cons (NULL_TREE, | |
2664 | get_unpadded_type (Etype (gnat_index)), | |
2665 | TYPE_ACTUAL_BOUNDS (gnu_inner))); | |
2666 | ||
2667 | if (Convention (gnat_entity) != Convention_Fortran) | |
2668 | SET_TYPE_ACTUAL_BOUNDS | |
2669 | (gnu_inner, nreverse (TYPE_ACTUAL_BOUNDS (gnu_inner))); | |
2670 | ||
2671 | if (TREE_CODE (gnu_type) == RECORD_TYPE | |
2672 | && TYPE_JUSTIFIED_MODULAR_P (gnu_type)) | |
2673 | TREE_TYPE (TYPE_FIELDS (gnu_type)) = gnu_inner; | |
2674 | } | |
a1ab4c31 | 2675 | } |
a1ab4c31 | 2676 | |
7c20033e EB |
2677 | else |
2678 | /* Abort if packed array with no Packed_Array_Type field set. */ | |
2679 | gcc_assert (!Is_Packed (gnat_entity)); | |
2680 | } | |
a1ab4c31 AC |
2681 | break; |
2682 | ||
2683 | case E_String_Literal_Subtype: | |
2ddc34ba | 2684 | /* Create the type for a string literal. */ |
a1ab4c31 AC |
2685 | { |
2686 | Entity_Id gnat_full_type | |
2687 | = (IN (Ekind (Etype (gnat_entity)), Private_Kind) | |
2688 | && Present (Full_View (Etype (gnat_entity))) | |
2689 | ? Full_View (Etype (gnat_entity)) : Etype (gnat_entity)); | |
2690 | tree gnu_string_type = get_unpadded_type (gnat_full_type); | |
2691 | tree gnu_string_array_type | |
2692 | = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_string_type)))); | |
2693 | tree gnu_string_index_type | |
2694 | = get_base_type (TREE_TYPE (TYPE_INDEX_TYPE | |
2695 | (TYPE_DOMAIN (gnu_string_array_type)))); | |
2696 | tree gnu_lower_bound | |
2697 | = convert (gnu_string_index_type, | |
2698 | gnat_to_gnu (String_Literal_Low_Bound (gnat_entity))); | |
2699 | int length = UI_To_Int (String_Literal_Length (gnat_entity)); | |
2700 | tree gnu_length = ssize_int (length - 1); | |
2701 | tree gnu_upper_bound | |
2702 | = build_binary_op (PLUS_EXPR, gnu_string_index_type, | |
2703 | gnu_lower_bound, | |
2704 | convert (gnu_string_index_type, gnu_length)); | |
a1ab4c31 | 2705 | tree gnu_index_type |
c1abd261 EB |
2706 | = create_index_type (convert (sizetype, gnu_lower_bound), |
2707 | convert (sizetype, gnu_upper_bound), | |
84fb43a1 EB |
2708 | create_range_type (gnu_string_index_type, |
2709 | gnu_lower_bound, | |
2710 | gnu_upper_bound), | |
c1abd261 | 2711 | gnat_entity); |
a1ab4c31 AC |
2712 | |
2713 | gnu_type | |
523e82a7 EB |
2714 | = build_nonshared_array_type (gnat_to_gnu_type |
2715 | (Component_Type (gnat_entity)), | |
2716 | gnu_index_type); | |
d8e94f79 | 2717 | if (array_type_has_nonaliased_component (gnu_type, gnat_entity)) |
c3734896 | 2718 | TYPE_NONALIASED_COMPONENT (gnu_type) = 1; |
794511d2 | 2719 | relate_alias_sets (gnu_type, gnu_string_type, ALIAS_SET_COPY); |
a1ab4c31 AC |
2720 | } |
2721 | break; | |
2722 | ||
2723 | /* Record Types and Subtypes | |
2724 | ||
2725 | The following fields are defined on record types: | |
2726 | ||
2727 | Has_Discriminants True if the record has discriminants | |
2728 | First_Discriminant Points to head of list of discriminants | |
2729 | First_Entity Points to head of list of fields | |
2730 | Is_Tagged_Type True if the record is tagged | |
2731 | ||
2732 | Implementation of Ada records and discriminated records: | |
2733 | ||
2734 | A record type definition is transformed into the equivalent of a C | |
2735 | struct definition. The fields that are the discriminants which are | |
2736 | found in the Full_Type_Declaration node and the elements of the | |
2737 | Component_List found in the Record_Type_Definition node. The | |
2738 | Component_List can be a recursive structure since each Variant of | |
2739 | the Variant_Part of the Component_List has a Component_List. | |
2740 | ||
2741 | Processing of a record type definition comprises starting the list of | |
2742 | field declarations here from the discriminants and the calling the | |
2743 | function components_to_record to add the rest of the fields from the | |
2ddc34ba | 2744 | component list and return the gnu type node. The function |
a1ab4c31 AC |
2745 | components_to_record will call itself recursively as it traverses |
2746 | the tree. */ | |
2747 | ||
2748 | case E_Record_Type: | |
2749 | if (Has_Complex_Representation (gnat_entity)) | |
2750 | { | |
2751 | gnu_type | |
2752 | = build_complex_type | |
2753 | (get_unpadded_type | |
2754 | (Etype (Defining_Entity | |
2755 | (First (Component_Items | |
2756 | (Component_List | |
2757 | (Type_Definition | |
2758 | (Declaration_Node (gnat_entity))))))))); | |
2759 | ||
2760 | break; | |
2761 | } | |
2762 | ||
2763 | { | |
2764 | Node_Id full_definition = Declaration_Node (gnat_entity); | |
2765 | Node_Id record_definition = Type_Definition (full_definition); | |
2766 | Entity_Id gnat_field; | |
c244bf8f | 2767 | tree gnu_field, gnu_field_list = NULL_TREE, gnu_get_parent; |
a1ab4c31 AC |
2768 | /* Set PACKED in keeping with gnat_to_gnu_field. */ |
2769 | int packed | |
2770 | = Is_Packed (gnat_entity) | |
2771 | ? 1 | |
2772 | : Component_Alignment (gnat_entity) == Calign_Storage_Unit | |
2773 | ? -1 | |
2774 | : (Known_Alignment (gnat_entity) | |
2775 | || (Strict_Alignment (gnat_entity) | |
2776 | && Known_Static_Esize (gnat_entity))) | |
2777 | ? -2 | |
2778 | : 0; | |
c244bf8f | 2779 | bool has_discr = Has_Discriminants (gnat_entity); |
a1ab4c31 AC |
2780 | bool has_rep = Has_Specified_Layout (gnat_entity); |
2781 | bool all_rep = has_rep; | |
2782 | bool is_extension | |
2783 | = (Is_Tagged_Type (gnat_entity) | |
2784 | && Nkind (record_definition) == N_Derived_Type_Definition); | |
8cd28148 | 2785 | bool is_unchecked_union = Is_Unchecked_Union (gnat_entity); |
a1ab4c31 AC |
2786 | |
2787 | /* See if all fields have a rep clause. Stop when we find one | |
2788 | that doesn't. */ | |
8cd28148 EB |
2789 | if (all_rep) |
2790 | for (gnat_field = First_Entity (gnat_entity); | |
2791 | Present (gnat_field); | |
2792 | gnat_field = Next_Entity (gnat_field)) | |
2793 | if ((Ekind (gnat_field) == E_Component | |
2794 | || Ekind (gnat_field) == E_Discriminant) | |
2795 | && No (Component_Clause (gnat_field))) | |
2796 | { | |
2797 | all_rep = false; | |
2798 | break; | |
2799 | } | |
a1ab4c31 AC |
2800 | |
2801 | /* If this is a record extension, go a level further to find the | |
2802 | record definition. Also, verify we have a Parent_Subtype. */ | |
2803 | if (is_extension) | |
2804 | { | |
2805 | if (!type_annotate_only | |
2806 | || Present (Record_Extension_Part (record_definition))) | |
2807 | record_definition = Record_Extension_Part (record_definition); | |
2808 | ||
2809 | gcc_assert (type_annotate_only | |
2810 | || Present (Parent_Subtype (gnat_entity))); | |
2811 | } | |
2812 | ||
2813 | /* Make a node for the record. If we are not defining the record, | |
2814 | suppress expanding incomplete types. */ | |
2815 | gnu_type = make_node (tree_code_for_record_type (gnat_entity)); | |
0fb2335d | 2816 | TYPE_NAME (gnu_type) = gnu_entity_name; |
a1ab4c31 AC |
2817 | TYPE_PACKED (gnu_type) = (packed != 0) || has_rep; |
2818 | ||
2819 | if (!definition) | |
8cd28148 EB |
2820 | { |
2821 | defer_incomplete_level++; | |
2822 | this_deferred = true; | |
2823 | } | |
a1ab4c31 AC |
2824 | |
2825 | /* If both a size and rep clause was specified, put the size in | |
2826 | the record type now so that it can get the proper mode. */ | |
2827 | if (has_rep && Known_Esize (gnat_entity)) | |
2828 | TYPE_SIZE (gnu_type) = UI_To_gnu (Esize (gnat_entity), sizetype); | |
2829 | ||
2830 | /* Always set the alignment here so that it can be used to | |
2831 | set the mode, if it is making the alignment stricter. If | |
2832 | it is invalid, it will be checked again below. If this is to | |
2833 | be Atomic, choose a default alignment of a word unless we know | |
2834 | the size and it's smaller. */ | |
2835 | if (Known_Alignment (gnat_entity)) | |
2836 | TYPE_ALIGN (gnu_type) | |
2837 | = validate_alignment (Alignment (gnat_entity), gnat_entity, 0); | |
2838 | else if (Is_Atomic (gnat_entity)) | |
2839 | TYPE_ALIGN (gnu_type) | |
2840 | = esize >= BITS_PER_WORD ? BITS_PER_WORD : ceil_alignment (esize); | |
2841 | /* If a type needs strict alignment, the minimum size will be the | |
2842 | type size instead of the RM size (see validate_size). Cap the | |
2843 | alignment, lest it causes this type size to become too large. */ | |
2844 | else if (Strict_Alignment (gnat_entity) | |
2845 | && Known_Static_Esize (gnat_entity)) | |
2846 | { | |
2847 | unsigned int raw_size = UI_To_Int (Esize (gnat_entity)); | |
2848 | unsigned int raw_align = raw_size & -raw_size; | |
2849 | if (raw_align < BIGGEST_ALIGNMENT) | |
2850 | TYPE_ALIGN (gnu_type) = raw_align; | |
2851 | } | |
2852 | else | |
2853 | TYPE_ALIGN (gnu_type) = 0; | |
2854 | ||
2855 | /* If we have a Parent_Subtype, make a field for the parent. If | |
2856 | this record has rep clauses, force the position to zero. */ | |
2857 | if (Present (Parent_Subtype (gnat_entity))) | |
2858 | { | |
2859 | Entity_Id gnat_parent = Parent_Subtype (gnat_entity); | |
2860 | tree gnu_parent; | |
2861 | ||
2862 | /* A major complexity here is that the parent subtype will | |
2863 | reference our discriminants in its Discriminant_Constraint | |
2864 | list. But those must reference the parent component of this | |
2865 | record which is of the parent subtype we have not built yet! | |
2866 | To break the circle we first build a dummy COMPONENT_REF which | |
2867 | represents the "get to the parent" operation and initialize | |
2868 | each of those discriminants to a COMPONENT_REF of the above | |
2869 | dummy parent referencing the corresponding discriminant of the | |
2870 | base type of the parent subtype. */ | |
2871 | gnu_get_parent = build3 (COMPONENT_REF, void_type_node, | |
2872 | build0 (PLACEHOLDER_EXPR, gnu_type), | |
c172df28 AH |
2873 | build_decl (input_location, |
2874 | FIELD_DECL, NULL_TREE, | |
a1ab4c31 AC |
2875 | void_type_node), |
2876 | NULL_TREE); | |
2877 | ||
c244bf8f | 2878 | if (has_discr) |
a1ab4c31 AC |
2879 | for (gnat_field = First_Stored_Discriminant (gnat_entity); |
2880 | Present (gnat_field); | |
2881 | gnat_field = Next_Stored_Discriminant (gnat_field)) | |
2882 | if (Present (Corresponding_Discriminant (gnat_field))) | |
e99c3ccc EB |
2883 | { |
2884 | tree gnu_field | |
2885 | = gnat_to_gnu_field_decl (Corresponding_Discriminant | |
2886 | (gnat_field)); | |
2887 | save_gnu_tree | |
2888 | (gnat_field, | |
2889 | build3 (COMPONENT_REF, TREE_TYPE (gnu_field), | |
2890 | gnu_get_parent, gnu_field, NULL_TREE), | |
2891 | true); | |
2892 | } | |
a1ab4c31 | 2893 | |
77022fa8 EB |
2894 | /* Then we build the parent subtype. If it has discriminants but |
2895 | the type itself has unknown discriminants, this means that it | |
2896 | doesn't contain information about how the discriminants are | |
2897 | derived from those of the ancestor type, so it cannot be used | |
2898 | directly. Instead it is built by cloning the parent subtype | |
2899 | of the underlying record view of the type, for which the above | |
2900 | derivation of discriminants has been made explicit. */ | |
2901 | if (Has_Discriminants (gnat_parent) | |
2902 | && Has_Unknown_Discriminants (gnat_entity)) | |
2903 | { | |
2904 | Entity_Id gnat_uview = Underlying_Record_View (gnat_entity); | |
2905 | ||
2906 | /* If we are defining the type, the underlying record | |
2907 | view must already have been elaborated at this point. | |
2908 | Otherwise do it now as its parent subtype cannot be | |
2909 | technically elaborated on its own. */ | |
2910 | if (definition) | |
2911 | gcc_assert (present_gnu_tree (gnat_uview)); | |
2912 | else | |
2913 | gnat_to_gnu_entity (gnat_uview, NULL_TREE, 0); | |
2914 | ||
2915 | gnu_parent = gnat_to_gnu_type (Parent_Subtype (gnat_uview)); | |
2916 | ||
2917 | /* Substitute the "get to the parent" of the type for that | |
2918 | of its underlying record view in the cloned type. */ | |
2919 | for (gnat_field = First_Stored_Discriminant (gnat_uview); | |
2920 | Present (gnat_field); | |
2921 | gnat_field = Next_Stored_Discriminant (gnat_field)) | |
2922 | if (Present (Corresponding_Discriminant (gnat_field))) | |
2923 | { | |
c6bd4220 | 2924 | tree gnu_field = gnat_to_gnu_field_decl (gnat_field); |
77022fa8 EB |
2925 | tree gnu_ref |
2926 | = build3 (COMPONENT_REF, TREE_TYPE (gnu_field), | |
2927 | gnu_get_parent, gnu_field, NULL_TREE); | |
2928 | gnu_parent | |
2929 | = substitute_in_type (gnu_parent, gnu_field, gnu_ref); | |
2930 | } | |
2931 | } | |
2932 | else | |
2933 | gnu_parent = gnat_to_gnu_type (gnat_parent); | |
a1ab4c31 AC |
2934 | |
2935 | /* Finally we fix up both kinds of twisted COMPONENT_REF we have | |
2936 | initially built. The discriminants must reference the fields | |
2937 | of the parent subtype and not those of its base type for the | |
2938 | placeholder machinery to properly work. */ | |
c244bf8f | 2939 | if (has_discr) |
cdaa0e0b EB |
2940 | { |
2941 | /* The actual parent subtype is the full view. */ | |
2942 | if (IN (Ekind (gnat_parent), Private_Kind)) | |
a1ab4c31 | 2943 | { |
cdaa0e0b EB |
2944 | if (Present (Full_View (gnat_parent))) |
2945 | gnat_parent = Full_View (gnat_parent); | |
2946 | else | |
2947 | gnat_parent = Underlying_Full_View (gnat_parent); | |
a1ab4c31 AC |
2948 | } |
2949 | ||
cdaa0e0b EB |
2950 | for (gnat_field = First_Stored_Discriminant (gnat_entity); |
2951 | Present (gnat_field); | |
2952 | gnat_field = Next_Stored_Discriminant (gnat_field)) | |
2953 | if (Present (Corresponding_Discriminant (gnat_field))) | |
2954 | { | |
2955 | Entity_Id field = Empty; | |
2956 | for (field = First_Stored_Discriminant (gnat_parent); | |
2957 | Present (field); | |
2958 | field = Next_Stored_Discriminant (field)) | |
2959 | if (same_discriminant_p (gnat_field, field)) | |
2960 | break; | |
2961 | gcc_assert (Present (field)); | |
2962 | TREE_OPERAND (get_gnu_tree (gnat_field), 1) | |
2963 | = gnat_to_gnu_field_decl (field); | |
2964 | } | |
2965 | } | |
2966 | ||
a1ab4c31 AC |
2967 | /* The "get to the parent" COMPONENT_REF must be given its |
2968 | proper type... */ | |
2969 | TREE_TYPE (gnu_get_parent) = gnu_parent; | |
2970 | ||
8cd28148 | 2971 | /* ...and reference the _Parent field of this record. */ |
a6a29d0c | 2972 | gnu_field |
76af763d | 2973 | = create_field_decl (parent_name_id, |
da01bfee | 2974 | gnu_parent, gnu_type, |
c244bf8f EB |
2975 | has_rep |
2976 | ? TYPE_SIZE (gnu_parent) : NULL_TREE, | |
2977 | has_rep | |
da01bfee EB |
2978 | ? bitsize_zero_node : NULL_TREE, |
2979 | 0, 1); | |
a6a29d0c EB |
2980 | DECL_INTERNAL_P (gnu_field) = 1; |
2981 | TREE_OPERAND (gnu_get_parent, 1) = gnu_field; | |
2982 | TYPE_FIELDS (gnu_type) = gnu_field; | |
a1ab4c31 AC |
2983 | } |
2984 | ||
2985 | /* Make the fields for the discriminants and put them into the record | |
2986 | unless it's an Unchecked_Union. */ | |
c244bf8f | 2987 | if (has_discr) |
a1ab4c31 AC |
2988 | for (gnat_field = First_Stored_Discriminant (gnat_entity); |
2989 | Present (gnat_field); | |
2990 | gnat_field = Next_Stored_Discriminant (gnat_field)) | |
2991 | { | |
8cd28148 EB |
2992 | /* If this is a record extension and this discriminant is the |
2993 | renaming of another discriminant, we've handled it above. */ | |
a1ab4c31 AC |
2994 | if (Present (Parent_Subtype (gnat_entity)) |
2995 | && Present (Corresponding_Discriminant (gnat_field))) | |
2996 | continue; | |
2997 | ||
2998 | gnu_field | |
839f2864 EB |
2999 | = gnat_to_gnu_field (gnat_field, gnu_type, packed, definition, |
3000 | debug_info_p); | |
a1ab4c31 AC |
3001 | |
3002 | /* Make an expression using a PLACEHOLDER_EXPR from the | |
3003 | FIELD_DECL node just created and link that with the | |
8cd28148 | 3004 | corresponding GNAT defining identifier. */ |
a1ab4c31 AC |
3005 | save_gnu_tree (gnat_field, |
3006 | build3 (COMPONENT_REF, TREE_TYPE (gnu_field), | |
8cd28148 | 3007 | build0 (PLACEHOLDER_EXPR, gnu_type), |
a1ab4c31 AC |
3008 | gnu_field, NULL_TREE), |
3009 | true); | |
3010 | ||
8cd28148 | 3011 | if (!is_unchecked_union) |
a1ab4c31 | 3012 | { |
910ad8de | 3013 | DECL_CHAIN (gnu_field) = gnu_field_list; |
a1ab4c31 AC |
3014 | gnu_field_list = gnu_field; |
3015 | } | |
3016 | } | |
3017 | ||
8cd28148 | 3018 | /* Add the fields into the record type and finish it up. */ |
a1ab4c31 | 3019 | components_to_record (gnu_type, Component_List (record_definition), |
ef0feeb2 EB |
3020 | gnu_field_list, packed, definition, false, |
3021 | all_rep, is_unchecked_union, debug_info_p, | |
3022 | false, OK_To_Reorder_Components (gnat_entity), | |
3023 | NULL); | |
a1ab4c31 | 3024 | |
cb3d597d | 3025 | /* If it is passed by reference, force BLKmode to ensure that objects |
86060344 | 3026 | of this type will always be put in memory. */ |
cb3d597d | 3027 | if (Is_By_Reference_Type (gnat_entity)) |
6f9f0ce3 | 3028 | SET_TYPE_MODE (gnu_type, BLKmode); |
a1ab4c31 | 3029 | |
c244bf8f EB |
3030 | /* We used to remove the associations of the discriminants and _Parent |
3031 | for validity checking but we may need them if there's a Freeze_Node | |
3032 | for a subtype used in this record. */ | |
3033 | TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity); | |
3034 | ||
a1ab4c31 AC |
3035 | /* Fill in locations of fields. */ |
3036 | annotate_rep (gnat_entity, gnu_type); | |
3037 | ||
8cd28148 EB |
3038 | /* If there are any entities in the chain corresponding to components |
3039 | that we did not elaborate, ensure we elaborate their types if they | |
3040 | are Itypes. */ | |
a1ab4c31 | 3041 | for (gnat_temp = First_Entity (gnat_entity); |
8cd28148 EB |
3042 | Present (gnat_temp); |
3043 | gnat_temp = Next_Entity (gnat_temp)) | |
a1ab4c31 AC |
3044 | if ((Ekind (gnat_temp) == E_Component |
3045 | || Ekind (gnat_temp) == E_Discriminant) | |
3046 | && Is_Itype (Etype (gnat_temp)) | |
3047 | && !present_gnu_tree (gnat_temp)) | |
3048 | gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0); | |
871fda0a EB |
3049 | |
3050 | /* If this is a record type associated with an exception definition, | |
3051 | equate its fields to those of the standard exception type. This | |
3052 | will make it possible to convert between them. */ | |
3053 | if (gnu_entity_name == exception_data_name_id) | |
3054 | { | |
3055 | tree gnu_std_field; | |
3056 | for (gnu_field = TYPE_FIELDS (gnu_type), | |
3057 | gnu_std_field = TYPE_FIELDS (except_type_node); | |
3058 | gnu_field; | |
910ad8de NF |
3059 | gnu_field = DECL_CHAIN (gnu_field), |
3060 | gnu_std_field = DECL_CHAIN (gnu_std_field)) | |
871fda0a EB |
3061 | SET_DECL_ORIGINAL_FIELD_TO_FIELD (gnu_field, gnu_std_field); |
3062 | gcc_assert (!gnu_std_field); | |
3063 | } | |
a1ab4c31 AC |
3064 | } |
3065 | break; | |
3066 | ||
3067 | case E_Class_Wide_Subtype: | |
3068 | /* If an equivalent type is present, that is what we should use. | |
3069 | Otherwise, fall through to handle this like a record subtype | |
3070 | since it may have constraints. */ | |
3071 | if (gnat_equiv_type != gnat_entity) | |
3072 | { | |
3073 | gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0); | |
3074 | maybe_present = true; | |
3075 | break; | |
3076 | } | |
3077 | ||
3078 | /* ... fall through ... */ | |
3079 | ||
3080 | case E_Record_Subtype: | |
a1ab4c31 AC |
3081 | /* If Cloned_Subtype is Present it means this record subtype has |
3082 | identical layout to that type or subtype and we should use | |
3083 | that GCC type for this one. The front end guarantees that | |
3084 | the component list is shared. */ | |
3085 | if (Present (Cloned_Subtype (gnat_entity))) | |
3086 | { | |
3087 | gnu_decl = gnat_to_gnu_entity (Cloned_Subtype (gnat_entity), | |
3088 | NULL_TREE, 0); | |
3089 | maybe_present = true; | |
8cd28148 | 3090 | break; |
a1ab4c31 AC |
3091 | } |
3092 | ||
3093 | /* Otherwise, first ensure the base type is elaborated. Then, if we are | |
8cd28148 EB |
3094 | changing the type, make a new type with each field having the type of |
3095 | the field in the new subtype but the position computed by transforming | |
3096 | every discriminant reference according to the constraints. We don't | |
3097 | see any difference between private and non-private type here since | |
3098 | derivations from types should have been deferred until the completion | |
3099 | of the private type. */ | |
a1ab4c31 AC |
3100 | else |
3101 | { | |
3102 | Entity_Id gnat_base_type = Implementation_Base_Type (gnat_entity); | |
c244bf8f | 3103 | tree gnu_base_type; |
a1ab4c31 AC |
3104 | |
3105 | if (!definition) | |
8cd28148 EB |
3106 | { |
3107 | defer_incomplete_level++; | |
3108 | this_deferred = true; | |
3109 | } | |
a1ab4c31 | 3110 | |
a1ab4c31 AC |
3111 | gnu_base_type = gnat_to_gnu_type (gnat_base_type); |
3112 | ||
a1ab4c31 AC |
3113 | if (present_gnu_tree (gnat_entity)) |
3114 | { | |
3115 | maybe_present = true; | |
3116 | break; | |
3117 | } | |
3118 | ||
901ad63f EB |
3119 | /* If this is a record subtype associated with a dispatch table, |
3120 | strip the suffix. This is necessary to make sure 2 different | |
3121 | subtypes associated with the imported and exported views of a | |
3122 | dispatch table are properly merged in LTO mode. */ | |
3123 | if (Is_Dispatch_Table_Entity (gnat_entity)) | |
3124 | { | |
3125 | char *p; | |
3126 | Get_Encoded_Name (gnat_entity); | |
c679a915 | 3127 | p = strchr (Name_Buffer, '_'); |
901ad63f | 3128 | gcc_assert (p); |
c679a915 | 3129 | strcpy (p+2, "dtS"); |
901ad63f EB |
3130 | gnu_entity_name = get_identifier (Name_Buffer); |
3131 | } | |
3132 | ||
8cd28148 | 3133 | /* When the subtype has discriminants and these discriminants affect |
95c1c4bb EB |
3134 | the initial shape it has inherited, factor them in. But for an |
3135 | Unchecked_Union (it must be an Itype), just return the type. | |
8cd28148 EB |
3136 | We can't just test Is_Constrained because private subtypes without |
3137 | discriminants of types with discriminants with default expressions | |
3138 | are Is_Constrained but aren't constrained! */ | |
a1ab4c31 | 3139 | if (IN (Ekind (gnat_base_type), Record_Kind) |
a1ab4c31 | 3140 | && !Is_Unchecked_Union (gnat_base_type) |
8cd28148 | 3141 | && !Is_For_Access_Subtype (gnat_entity) |
a1ab4c31 | 3142 | && Is_Constrained (gnat_entity) |
8cd28148 EB |
3143 | && Has_Discriminants (gnat_entity) |
3144 | && Present (Discriminant_Constraint (gnat_entity)) | |
3145 | && Stored_Constraint (gnat_entity) != No_Elist) | |
a1ab4c31 | 3146 | { |
e3554601 | 3147 | VEC(subst_pair,heap) *gnu_subst_list |
8cd28148 | 3148 | = build_subst_list (gnat_entity, gnat_base_type, definition); |
95c1c4bb | 3149 | tree gnu_unpad_base_type, gnu_rep_part, gnu_variant_part, t; |
fb7fb701 | 3150 | tree gnu_pos_list, gnu_field_list = NULL_TREE; |
95c1c4bb | 3151 | bool selected_variant = false; |
8cd28148 | 3152 | Entity_Id gnat_field; |
fb7fb701 | 3153 | VEC(variant_desc,heap) *gnu_variant_list; |
a1ab4c31 AC |
3154 | |
3155 | gnu_type = make_node (RECORD_TYPE); | |
0fb2335d | 3156 | TYPE_NAME (gnu_type) = gnu_entity_name; |
a1ab4c31 AC |
3157 | |
3158 | /* Set the size, alignment and alias set of the new type to | |
95c1c4bb EB |
3159 | match that of the old one, doing required substitutions. */ |
3160 | copy_and_substitute_in_size (gnu_type, gnu_base_type, | |
3161 | gnu_subst_list); | |
c244bf8f | 3162 | |
315cff15 | 3163 | if (TYPE_IS_PADDING_P (gnu_base_type)) |
c244bf8f EB |
3164 | gnu_unpad_base_type = TREE_TYPE (TYPE_FIELDS (gnu_base_type)); |
3165 | else | |
3166 | gnu_unpad_base_type = gnu_base_type; | |
3167 | ||
95c1c4bb EB |
3168 | /* Look for a REP part in the base type. */ |
3169 | gnu_rep_part = get_rep_part (gnu_unpad_base_type); | |
3170 | ||
3171 | /* Look for a variant part in the base type. */ | |
3172 | gnu_variant_part = get_variant_part (gnu_unpad_base_type); | |
3173 | ||
3174 | /* If there is a variant part, we must compute whether the | |
3175 | constraints statically select a particular variant. If | |
3176 | so, we simply drop the qualified union and flatten the | |
3177 | list of fields. Otherwise we'll build a new qualified | |
3178 | union for the variants that are still relevant. */ | |
3179 | if (gnu_variant_part) | |
3180 | { | |
fb7fb701 NF |
3181 | variant_desc *v; |
3182 | unsigned ix; | |
3183 | ||
95c1c4bb EB |
3184 | gnu_variant_list |
3185 | = build_variant_list (TREE_TYPE (gnu_variant_part), | |
fb7fb701 | 3186 | gnu_subst_list, NULL); |
95c1c4bb EB |
3187 | |
3188 | /* If all the qualifiers are unconditionally true, the | |
3189 | innermost variant is statically selected. */ | |
3190 | selected_variant = true; | |
fb7fb701 NF |
3191 | FOR_EACH_VEC_ELT_REVERSE (variant_desc, gnu_variant_list, |
3192 | ix, v) | |
3193 | if (!integer_onep (v->qual)) | |
95c1c4bb EB |
3194 | { |
3195 | selected_variant = false; | |
3196 | break; | |
3197 | } | |
3198 | ||
3199 | /* Otherwise, create the new variants. */ | |
3200 | if (!selected_variant) | |
fb7fb701 NF |
3201 | FOR_EACH_VEC_ELT_REVERSE (variant_desc, gnu_variant_list, |
3202 | ix, v) | |
95c1c4bb | 3203 | { |
fb7fb701 | 3204 | tree old_variant = v->type; |
95c1c4bb EB |
3205 | tree new_variant = make_node (RECORD_TYPE); |
3206 | TYPE_NAME (new_variant) | |
3207 | = DECL_NAME (TYPE_NAME (old_variant)); | |
3208 | copy_and_substitute_in_size (new_variant, old_variant, | |
3209 | gnu_subst_list); | |
fb7fb701 | 3210 | v->record = new_variant; |
95c1c4bb EB |
3211 | } |
3212 | } | |
3213 | else | |
3214 | { | |
fb7fb701 | 3215 | gnu_variant_list = NULL; |
95c1c4bb EB |
3216 | selected_variant = false; |
3217 | } | |
3218 | ||
c244bf8f | 3219 | gnu_pos_list |
95c1c4bb EB |
3220 | = build_position_list (gnu_unpad_base_type, |
3221 | gnu_variant_list && !selected_variant, | |
3222 | size_zero_node, bitsize_zero_node, | |
3223 | BIGGEST_ALIGNMENT, NULL_TREE); | |
a1ab4c31 AC |
3224 | |
3225 | for (gnat_field = First_Entity (gnat_entity); | |
c244bf8f EB |
3226 | Present (gnat_field); |
3227 | gnat_field = Next_Entity (gnat_field)) | |
a1ab4c31 AC |
3228 | if ((Ekind (gnat_field) == E_Component |
3229 | || Ekind (gnat_field) == E_Discriminant) | |
c244bf8f EB |
3230 | && !(Present (Corresponding_Discriminant (gnat_field)) |
3231 | && Is_Tagged_Type (gnat_base_type)) | |
8cd28148 EB |
3232 | && Underlying_Type (Scope (Original_Record_Component |
3233 | (gnat_field))) | |
c244bf8f | 3234 | == gnat_base_type) |
a1ab4c31 | 3235 | { |
a6a29d0c | 3236 | Name_Id gnat_name = Chars (gnat_field); |
c244bf8f EB |
3237 | Entity_Id gnat_old_field |
3238 | = Original_Record_Component (gnat_field); | |
a1ab4c31 | 3239 | tree gnu_old_field |
c244bf8f | 3240 | = gnat_to_gnu_field_decl (gnat_old_field); |
95c1c4bb EB |
3241 | tree gnu_context = DECL_CONTEXT (gnu_old_field); |
3242 | tree gnu_field, gnu_field_type, gnu_size; | |
3243 | tree gnu_cont_type, gnu_last = NULL_TREE; | |
3f6f0eb2 EB |
3244 | |
3245 | /* If the type is the same, retrieve the GCC type from the | |
3246 | old field to take into account possible adjustments. */ | |
c244bf8f | 3247 | if (Etype (gnat_field) == Etype (gnat_old_field)) |
3f6f0eb2 EB |
3248 | gnu_field_type = TREE_TYPE (gnu_old_field); |
3249 | else | |
3250 | gnu_field_type = gnat_to_gnu_type (Etype (gnat_field)); | |
3251 | ||
a1ab4c31 AC |
3252 | /* If there was a component clause, the field types must be |
3253 | the same for the type and subtype, so copy the data from | |
3254 | the old field to avoid recomputation here. Also if the | |
3255 | field is justified modular and the optimization in | |
3256 | gnat_to_gnu_field was applied. */ | |
c244bf8f | 3257 | if (Present (Component_Clause (gnat_old_field)) |
a1ab4c31 AC |
3258 | || (TREE_CODE (gnu_field_type) == RECORD_TYPE |
3259 | && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type) | |
3260 | && TREE_TYPE (TYPE_FIELDS (gnu_field_type)) | |
3261 | == TREE_TYPE (gnu_old_field))) | |
3262 | { | |
3263 | gnu_size = DECL_SIZE (gnu_old_field); | |
3264 | gnu_field_type = TREE_TYPE (gnu_old_field); | |
3265 | } | |
3266 | ||
3267 | /* If the old field was packed and of constant size, we | |
3268 | have to get the old size here, as it might differ from | |
3269 | what the Etype conveys and the latter might overlap | |
3270 | onto the following field. Try to arrange the type for | |
3271 | possible better packing along the way. */ | |
3272 | else if (DECL_PACKED (gnu_old_field) | |
3273 | && TREE_CODE (DECL_SIZE (gnu_old_field)) | |
3274 | == INTEGER_CST) | |
3275 | { | |
3276 | gnu_size = DECL_SIZE (gnu_old_field); | |
39ae51e0 | 3277 | if (TREE_CODE (gnu_field_type) == RECORD_TYPE |
315cff15 | 3278 | && !TYPE_FAT_POINTER_P (gnu_field_type) |
a1ab4c31 AC |
3279 | && host_integerp (TYPE_SIZE (gnu_field_type), 1)) |
3280 | gnu_field_type | |
3281 | = make_packable_type (gnu_field_type, true); | |
3282 | } | |
3283 | ||
c244bf8f EB |
3284 | else |
3285 | gnu_size = TYPE_SIZE (gnu_field_type); | |
3286 | ||
95c1c4bb EB |
3287 | /* If the context of the old field is the base type or its |
3288 | REP part (if any), put the field directly in the new | |
3289 | type; otherwise look up the context in the variant list | |
3290 | and put the field either in the new type if there is a | |
3291 | selected variant or in one of the new variants. */ | |
3292 | if (gnu_context == gnu_unpad_base_type | |
3293 | || (gnu_rep_part | |
3294 | && gnu_context == TREE_TYPE (gnu_rep_part))) | |
3295 | gnu_cont_type = gnu_type; | |
3296 | else | |
a1ab4c31 | 3297 | { |
fb7fb701 NF |
3298 | variant_desc *v; |
3299 | unsigned ix; | |
3300 | ||
3301 | t = NULL_TREE; | |
3302 | FOR_EACH_VEC_ELT_REVERSE (variant_desc, | |
3303 | gnu_variant_list, ix, v) | |
3304 | if (v->type == gnu_context) | |
3305 | { | |
3306 | t = v->type; | |
3307 | break; | |
3308 | } | |
95c1c4bb EB |
3309 | if (t) |
3310 | { | |
3311 | if (selected_variant) | |
3312 | gnu_cont_type = gnu_type; | |
3313 | else | |
fb7fb701 | 3314 | gnu_cont_type = v->record; |
95c1c4bb EB |
3315 | } |
3316 | else | |
3317 | /* The front-end may pass us "ghost" components if | |
3318 | it fails to recognize that a constrained subtype | |
3319 | is statically constrained. Discard them. */ | |
a1ab4c31 AC |
3320 | continue; |
3321 | } | |
3322 | ||
95c1c4bb | 3323 | /* Now create the new field modeled on the old one. */ |
a1ab4c31 | 3324 | gnu_field |
95c1c4bb EB |
3325 | = create_field_decl_from (gnu_old_field, gnu_field_type, |
3326 | gnu_cont_type, gnu_size, | |
3327 | gnu_pos_list, gnu_subst_list); | |
a1ab4c31 | 3328 | |
95c1c4bb EB |
3329 | /* Put it in one of the new variants directly. */ |
3330 | if (gnu_cont_type != gnu_type) | |
a1ab4c31 | 3331 | { |
910ad8de | 3332 | DECL_CHAIN (gnu_field) = TYPE_FIELDS (gnu_cont_type); |
95c1c4bb | 3333 | TYPE_FIELDS (gnu_cont_type) = gnu_field; |
a1ab4c31 AC |
3334 | } |
3335 | ||
a6a29d0c EB |
3336 | /* To match the layout crafted in components_to_record, |
3337 | if this is the _Tag or _Parent field, put it before | |
3338 | any other fields. */ | |
95c1c4bb EB |
3339 | else if (gnat_name == Name_uTag |
3340 | || gnat_name == Name_uParent) | |
13318d2f | 3341 | gnu_field_list = chainon (gnu_field_list, gnu_field); |
a6a29d0c EB |
3342 | |
3343 | /* Similarly, if this is the _Controller field, put | |
3344 | it before the other fields except for the _Tag or | |
3345 | _Parent field. */ | |
3346 | else if (gnat_name == Name_uController && gnu_last) | |
3347 | { | |
e3edbd56 EB |
3348 | DECL_CHAIN (gnu_field) = DECL_CHAIN (gnu_last); |
3349 | DECL_CHAIN (gnu_last) = gnu_field; | |
a6a29d0c EB |
3350 | } |
3351 | ||
3352 | /* Otherwise, if this is a regular field, put it after | |
3353 | the other fields. */ | |
13318d2f EB |
3354 | else |
3355 | { | |
910ad8de | 3356 | DECL_CHAIN (gnu_field) = gnu_field_list; |
13318d2f | 3357 | gnu_field_list = gnu_field; |
a6a29d0c EB |
3358 | if (!gnu_last) |
3359 | gnu_last = gnu_field; | |
13318d2f EB |
3360 | } |
3361 | ||
a1ab4c31 AC |
3362 | save_gnu_tree (gnat_field, gnu_field, false); |
3363 | } | |
3364 | ||
95c1c4bb EB |
3365 | /* If there is a variant list and no selected variant, we need |
3366 | to create the nest of variant parts from the old nest. */ | |
3367 | if (gnu_variant_list && !selected_variant) | |
3368 | { | |
3369 | tree new_variant_part | |
3370 | = create_variant_part_from (gnu_variant_part, | |
3371 | gnu_variant_list, gnu_type, | |
3372 | gnu_pos_list, gnu_subst_list); | |
910ad8de | 3373 | DECL_CHAIN (new_variant_part) = gnu_field_list; |
95c1c4bb EB |
3374 | gnu_field_list = new_variant_part; |
3375 | } | |
3376 | ||
a1ab4c31 AC |
3377 | /* Now go through the entities again looking for Itypes that |
3378 | we have not elaborated but should (e.g., Etypes of fields | |
3379 | that have Original_Components). */ | |
3380 | for (gnat_field = First_Entity (gnat_entity); | |
3381 | Present (gnat_field); gnat_field = Next_Entity (gnat_field)) | |
3382 | if ((Ekind (gnat_field) == E_Discriminant | |
3383 | || Ekind (gnat_field) == E_Component) | |
3384 | && !present_gnu_tree (Etype (gnat_field))) | |
3385 | gnat_to_gnu_entity (Etype (gnat_field), NULL_TREE, 0); | |
3386 | ||
032d1b71 EB |
3387 | /* Do not emit debug info for the type yet since we're going to |
3388 | modify it below. */ | |
a1ab4c31 | 3389 | gnu_field_list = nreverse (gnu_field_list); |
032d1b71 | 3390 | finish_record_type (gnu_type, gnu_field_list, 2, false); |
a1ab4c31 | 3391 | |
c244bf8f | 3392 | /* See the E_Record_Type case for the rationale. */ |
cb3d597d | 3393 | if (Is_By_Reference_Type (gnat_entity)) |
c244bf8f EB |
3394 | SET_TYPE_MODE (gnu_type, BLKmode); |
3395 | else | |
3396 | compute_record_mode (gnu_type); | |
3397 | ||
3398 | TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity); | |
a1ab4c31 AC |
3399 | |
3400 | /* Fill in locations of fields. */ | |
3401 | annotate_rep (gnat_entity, gnu_type); | |
3402 | ||
e9cfc9b5 EB |
3403 | /* If debugging information is being written for the type, write |
3404 | a record that shows what we are a subtype of and also make a | |
3405 | variable that indicates our size, if still variable. */ | |
a1ab4c31 AC |
3406 | if (debug_info_p) |
3407 | { | |
3408 | tree gnu_subtype_marker = make_node (RECORD_TYPE); | |
c244bf8f | 3409 | tree gnu_unpad_base_name = TYPE_NAME (gnu_unpad_base_type); |
e9cfc9b5 | 3410 | tree gnu_size_unit = TYPE_SIZE_UNIT (gnu_type); |
a1ab4c31 | 3411 | |
c244bf8f EB |
3412 | if (TREE_CODE (gnu_unpad_base_name) == TYPE_DECL) |
3413 | gnu_unpad_base_name = DECL_NAME (gnu_unpad_base_name); | |
a1ab4c31 AC |
3414 | |
3415 | TYPE_NAME (gnu_subtype_marker) | |
3416 | = create_concat_name (gnat_entity, "XVS"); | |
3417 | finish_record_type (gnu_subtype_marker, | |
c244bf8f EB |
3418 | create_field_decl (gnu_unpad_base_name, |
3419 | build_reference_type | |
3420 | (gnu_unpad_base_type), | |
a1ab4c31 | 3421 | gnu_subtype_marker, |
da01bfee EB |
3422 | NULL_TREE, NULL_TREE, |
3423 | 0, 0), | |
032d1b71 | 3424 | 0, true); |
a1ab4c31 AC |
3425 | |
3426 | add_parallel_type (TYPE_STUB_DECL (gnu_type), | |
3427 | gnu_subtype_marker); | |
e9cfc9b5 EB |
3428 | |
3429 | if (definition | |
3430 | && TREE_CODE (gnu_size_unit) != INTEGER_CST | |
3431 | && !CONTAINS_PLACEHOLDER_P (gnu_size_unit)) | |
b5bba4a6 EB |
3432 | TYPE_SIZE_UNIT (gnu_subtype_marker) |
3433 | = create_var_decl (create_concat_name (gnat_entity, | |
3434 | "XVZ"), | |
3435 | NULL_TREE, sizetype, gnu_size_unit, | |
3436 | false, false, false, false, NULL, | |
3437 | gnat_entity); | |
a1ab4c31 AC |
3438 | } |
3439 | ||
fb7fb701 | 3440 | VEC_free (variant_desc, heap, gnu_variant_list); |
e3554601 NF |
3441 | VEC_free (subst_pair, heap, gnu_subst_list); |
3442 | ||
a1ab4c31 AC |
3443 | /* Now we can finalize it. */ |
3444 | rest_of_record_type_compilation (gnu_type); | |
3445 | } | |
3446 | ||
8cd28148 EB |
3447 | /* Otherwise, go down all the components in the new type and make |
3448 | them equivalent to those in the base type. */ | |
a1ab4c31 | 3449 | else |
8cd28148 | 3450 | { |
c244bf8f | 3451 | gnu_type = gnu_base_type; |
8cd28148 EB |
3452 | |
3453 | for (gnat_temp = First_Entity (gnat_entity); | |
3454 | Present (gnat_temp); | |
3455 | gnat_temp = Next_Entity (gnat_temp)) | |
3456 | if ((Ekind (gnat_temp) == E_Discriminant | |
3457 | && !Is_Unchecked_Union (gnat_base_type)) | |
3458 | || Ekind (gnat_temp) == E_Component) | |
3459 | save_gnu_tree (gnat_temp, | |
3460 | gnat_to_gnu_field_decl | |
3461 | (Original_Record_Component (gnat_temp)), | |
3462 | false); | |
3463 | } | |
a1ab4c31 AC |
3464 | } |
3465 | break; | |
3466 | ||
3467 | case E_Access_Subprogram_Type: | |
3468 | /* Use the special descriptor type for dispatch tables if needed, | |
3469 | that is to say for the Prim_Ptr of a-tags.ads and its clones. | |
3470 | Note that we are only required to do so for static tables in | |
3471 | order to be compatible with the C++ ABI, but Ada 2005 allows | |
3472 | to extend library level tagged types at the local level so | |
3473 | we do it in the non-static case as well. */ | |
3474 | if (TARGET_VTABLE_USES_DESCRIPTORS | |
3475 | && Is_Dispatch_Table_Entity (gnat_entity)) | |
3476 | { | |
3477 | gnu_type = fdesc_type_node; | |
3478 | gnu_size = TYPE_SIZE (gnu_type); | |
3479 | break; | |
3480 | } | |
3481 | ||
3482 | /* ... fall through ... */ | |
3483 | ||
3484 | case E_Anonymous_Access_Subprogram_Type: | |
3485 | /* If we are not defining this entity, and we have incomplete | |
3486 | entities being processed above us, make a dummy type and | |
3487 | fill it in later. */ | |
3488 | if (!definition && defer_incomplete_level != 0) | |
3489 | { | |
3490 | struct incomplete *p | |
3491 | = (struct incomplete *) xmalloc (sizeof (struct incomplete)); | |
3492 | ||
3493 | gnu_type | |
3494 | = build_pointer_type | |
3495 | (make_dummy_type (Directly_Designated_Type (gnat_entity))); | |
0fb2335d | 3496 | gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list, |
a1ab4c31 AC |
3497 | !Comes_From_Source (gnat_entity), |
3498 | debug_info_p, gnat_entity); | |
3499 | this_made_decl = true; | |
3500 | gnu_type = TREE_TYPE (gnu_decl); | |
3501 | save_gnu_tree (gnat_entity, gnu_decl, false); | |
3502 | saved = true; | |
3503 | ||
3504 | p->old_type = TREE_TYPE (gnu_type); | |
3505 | p->full_type = Directly_Designated_Type (gnat_entity); | |
3506 | p->next = defer_incomplete_list; | |
3507 | defer_incomplete_list = p; | |
3508 | break; | |
3509 | } | |
3510 | ||
3511 | /* ... fall through ... */ | |
3512 | ||
3513 | case E_Allocator_Type: | |
3514 | case E_Access_Type: | |
3515 | case E_Access_Attribute_Type: | |
3516 | case E_Anonymous_Access_Type: | |
3517 | case E_General_Access_Type: | |
3518 | { | |
d0c26312 | 3519 | /* The designated type and its equivalent type for gigi. */ |
a1ab4c31 AC |
3520 | Entity_Id gnat_desig_type = Directly_Designated_Type (gnat_entity); |
3521 | Entity_Id gnat_desig_equiv = Gigi_Equivalent_Type (gnat_desig_type); | |
d0c26312 | 3522 | /* Whether it comes from a limited with. */ |
a1ab4c31 AC |
3523 | bool is_from_limited_with |
3524 | = (IN (Ekind (gnat_desig_equiv), Incomplete_Kind) | |
3525 | && From_With_Type (gnat_desig_equiv)); | |
d0c26312 | 3526 | /* The "full view" of the designated type. If this is an incomplete |
a1ab4c31 AC |
3527 | entity from a limited with, treat its non-limited view as the full |
3528 | view. Otherwise, if this is an incomplete or private type, use the | |
3529 | full view. In the former case, we might point to a private type, | |
3530 | in which case, we need its full view. Also, we want to look at the | |
3531 | actual type used for the representation, so this takes a total of | |
3532 | three steps. */ | |
3533 | Entity_Id gnat_desig_full_direct_first | |
d0c26312 EB |
3534 | = (is_from_limited_with |
3535 | ? Non_Limited_View (gnat_desig_equiv) | |
a1ab4c31 AC |
3536 | : (IN (Ekind (gnat_desig_equiv), Incomplete_Or_Private_Kind) |
3537 | ? Full_View (gnat_desig_equiv) : Empty)); | |
3538 | Entity_Id gnat_desig_full_direct | |
3539 | = ((is_from_limited_with | |
3540 | && Present (gnat_desig_full_direct_first) | |
3541 | && IN (Ekind (gnat_desig_full_direct_first), Private_Kind)) | |
3542 | ? Full_View (gnat_desig_full_direct_first) | |
3543 | : gnat_desig_full_direct_first); | |
3544 | Entity_Id gnat_desig_full | |
3545 | = Gigi_Equivalent_Type (gnat_desig_full_direct); | |
d0c26312 EB |
3546 | /* The type actually used to represent the designated type, either |
3547 | gnat_desig_full or gnat_desig_equiv. */ | |
a1ab4c31 | 3548 | Entity_Id gnat_desig_rep; |
1e17ef87 | 3549 | /* True if this is a pointer to an unconstrained array. */ |
a1ab4c31 | 3550 | bool is_unconstrained_array; |
a1ab4c31 AC |
3551 | /* We want to know if we'll be seeing the freeze node for any |
3552 | incomplete type we may be pointing to. */ | |
3553 | bool in_main_unit | |
3554 | = (Present (gnat_desig_full) | |
3555 | ? In_Extended_Main_Code_Unit (gnat_desig_full) | |
3556 | : In_Extended_Main_Code_Unit (gnat_desig_type)); | |
1e17ef87 | 3557 | /* True if we make a dummy type here. */ |
a1ab4c31 | 3558 | bool made_dummy = false; |
d0c26312 | 3559 | /* The mode to be used for the pointer type. */ |
a1ab4c31 | 3560 | enum machine_mode p_mode = mode_for_size (esize, MODE_INT, 0); |
d0c26312 EB |
3561 | /* The GCC type used for the designated type. */ |
3562 | tree gnu_desig_type = NULL_TREE; | |
a1ab4c31 AC |
3563 | |
3564 | if (!targetm.valid_pointer_mode (p_mode)) | |
3565 | p_mode = ptr_mode; | |
3566 | ||
3567 | /* If either the designated type or its full view is an unconstrained | |
3568 | array subtype, replace it with the type it's a subtype of. This | |
3569 | avoids problems with multiple copies of unconstrained array types. | |
3570 | Likewise, if the designated type is a subtype of an incomplete | |
3571 | record type, use the parent type to avoid order of elaboration | |
3572 | issues. This can lose some code efficiency, but there is no | |
3573 | alternative. */ | |
3574 | if (Ekind (gnat_desig_equiv) == E_Array_Subtype | |
d0c26312 | 3575 | && !Is_Constrained (gnat_desig_equiv)) |
a1ab4c31 AC |
3576 | gnat_desig_equiv = Etype (gnat_desig_equiv); |
3577 | if (Present (gnat_desig_full) | |
3578 | && ((Ekind (gnat_desig_full) == E_Array_Subtype | |
d0c26312 | 3579 | && !Is_Constrained (gnat_desig_full)) |
a1ab4c31 AC |
3580 | || (Ekind (gnat_desig_full) == E_Record_Subtype |
3581 | && Ekind (Etype (gnat_desig_full)) == E_Record_Type))) | |
3582 | gnat_desig_full = Etype (gnat_desig_full); | |
3583 | ||
d0c26312 EB |
3584 | /* Set the type that's actually the representation of the designated |
3585 | type and also flag whether we have a unconstrained array. */ | |
3586 | gnat_desig_rep | |
3587 | = Present (gnat_desig_full) ? gnat_desig_full : gnat_desig_equiv; | |
a1ab4c31 | 3588 | is_unconstrained_array |
d0c26312 | 3589 | = Is_Array_Type (gnat_desig_rep) && !Is_Constrained (gnat_desig_rep); |
a1ab4c31 AC |
3590 | |
3591 | /* If we are pointing to an incomplete type whose completion is an | |
e3edbd56 EB |
3592 | unconstrained array, make dummy fat and thin pointer types to it. |
3593 | Likewise if the type itself is dummy or an unconstrained array. */ | |
a1ab4c31 AC |
3594 | if (is_unconstrained_array |
3595 | && (Present (gnat_desig_full) | |
3596 | || (present_gnu_tree (gnat_desig_equiv) | |
d0c26312 EB |
3597 | && TYPE_IS_DUMMY_P |
3598 | (TREE_TYPE (get_gnu_tree (gnat_desig_equiv)))) | |
3599 | || (!in_main_unit | |
a10623fb | 3600 | && defer_incomplete_level != 0 |
d0c26312 EB |
3601 | && !present_gnu_tree (gnat_desig_equiv)) |
3602 | || (in_main_unit | |
3603 | && is_from_limited_with | |
3604 | && Present (Freeze_Node (gnat_desig_equiv))))) | |
a8e05f92 | 3605 | { |
a8e05f92 | 3606 | if (present_gnu_tree (gnat_desig_rep)) |
d0c26312 | 3607 | gnu_desig_type = TREE_TYPE (get_gnu_tree (gnat_desig_rep)); |
a8e05f92 EB |
3608 | else |
3609 | { | |
d0c26312 | 3610 | gnu_desig_type = make_dummy_type (gnat_desig_rep); |
e3edbd56 | 3611 | made_dummy = true; |
a8e05f92 | 3612 | } |
a1ab4c31 | 3613 | |
d0c26312 EB |
3614 | /* If the call above got something that has a pointer, the pointer |
3615 | is our type. This could have happened either because the type | |
3616 | was elaborated or because somebody else executed the code. */ | |
e3edbd56 EB |
3617 | if (!TYPE_POINTER_TO (gnu_desig_type)) |
3618 | build_dummy_unc_pointer_types (gnat_desig_equiv, gnu_desig_type); | |
d0c26312 | 3619 | gnu_type = TYPE_POINTER_TO (gnu_desig_type); |
a1ab4c31 AC |
3620 | } |
3621 | ||
3622 | /* If we already know what the full type is, use it. */ | |
3623 | else if (Present (gnat_desig_full) | |
3624 | && present_gnu_tree (gnat_desig_full)) | |
3625 | gnu_desig_type = TREE_TYPE (get_gnu_tree (gnat_desig_full)); | |
3626 | ||
d0c26312 EB |
3627 | /* Get the type of the thing we are to point to and build a pointer to |
3628 | it. If it is a reference to an incomplete or private type with a | |
a1ab4c31 AC |
3629 | full view that is a record, make a dummy type node and get the |
3630 | actual type later when we have verified it is safe. */ | |
d0c26312 EB |
3631 | else if ((!in_main_unit |
3632 | && !present_gnu_tree (gnat_desig_equiv) | |
a1ab4c31 | 3633 | && Present (gnat_desig_full) |
d0c26312 | 3634 | && !present_gnu_tree (gnat_desig_full) |
a1ab4c31 | 3635 | && Is_Record_Type (gnat_desig_full)) |
d0c26312 EB |
3636 | /* Likewise if we are pointing to a record or array and we are |
3637 | to defer elaborating incomplete types. We do this as this | |
3638 | access type may be the full view of a private type. Note | |
3639 | that the unconstrained array case is handled above. */ | |
3640 | || ((!in_main_unit || imported_p) | |
a10623fb | 3641 | && defer_incomplete_level != 0 |
d0c26312 EB |
3642 | && !present_gnu_tree (gnat_desig_equiv) |
3643 | && (Is_Record_Type (gnat_desig_rep) | |
3644 | || Is_Array_Type (gnat_desig_rep))) | |
a1ab4c31 | 3645 | /* If this is a reference from a limited_with type back to our |
d0c26312 | 3646 | main unit and there's a freeze node for it, either we have |
a1ab4c31 AC |
3647 | already processed the declaration and made the dummy type, |
3648 | in which case we just reuse the latter, or we have not yet, | |
3649 | in which case we make the dummy type and it will be reused | |
d0c26312 EB |
3650 | when the declaration is finally processed. In both cases, |
3651 | the pointer eventually created below will be automatically | |
3652 | adjusted when the freeze node is processed. Note that the | |
2ddc34ba | 3653 | unconstrained array case is handled above. */ |
d0c26312 EB |
3654 | || (in_main_unit |
3655 | && is_from_limited_with | |
a1ab4c31 AC |
3656 | && Present (Freeze_Node (gnat_desig_rep)))) |
3657 | { | |
3658 | gnu_desig_type = make_dummy_type (gnat_desig_equiv); | |
3659 | made_dummy = true; | |
3660 | } | |
3661 | ||
3662 | /* Otherwise handle the case of a pointer to itself. */ | |
3663 | else if (gnat_desig_equiv == gnat_entity) | |
3664 | { | |
3665 | gnu_type | |
3666 | = build_pointer_type_for_mode (void_type_node, p_mode, | |
3667 | No_Strict_Aliasing (gnat_entity)); | |
3668 | TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type) = gnu_type; | |
3669 | } | |
3670 | ||
d0c26312 EB |
3671 | /* If expansion is disabled, the equivalent type of a concurrent type |
3672 | is absent, so build a dummy pointer type. */ | |
a1ab4c31 AC |
3673 | else if (type_annotate_only && No (gnat_desig_equiv)) |
3674 | gnu_type = ptr_void_type_node; | |
3675 | ||
d0c26312 EB |
3676 | /* Finally, handle the default case where we can just elaborate our |
3677 | designated type. */ | |
a1ab4c31 AC |
3678 | else |
3679 | gnu_desig_type = gnat_to_gnu_type (gnat_desig_equiv); | |
3680 | ||
3681 | /* It is possible that a call to gnat_to_gnu_type above resolved our | |
3682 | type. If so, just return it. */ | |
3683 | if (present_gnu_tree (gnat_entity)) | |
3684 | { | |
3685 | maybe_present = true; | |
3686 | break; | |
3687 | } | |
3688 | ||
d0c26312 EB |
3689 | /* If we have not done it yet, build the pointer type the usual way. */ |
3690 | if (!gnu_type) | |
a1ab4c31 | 3691 | { |
d0c26312 EB |
3692 | /* Modify the designated type if we are pointing only to constant |
3693 | objects, but don't do it for unconstrained arrays. */ | |
a1ab4c31 AC |
3694 | if (Is_Access_Constant (gnat_entity) |
3695 | && TREE_CODE (gnu_desig_type) != UNCONSTRAINED_ARRAY_TYPE) | |
3696 | { | |
3697 | gnu_desig_type | |
3698 | = build_qualified_type | |
3699 | (gnu_desig_type, | |
3700 | TYPE_QUALS (gnu_desig_type) | TYPE_QUAL_CONST); | |
3701 | ||
3702 | /* Some extra processing is required if we are building a | |
2ddc34ba | 3703 | pointer to an incomplete type (in the GCC sense). We might |
a1ab4c31 AC |
3704 | have such a type if we just made a dummy, or directly out |
3705 | of the call to gnat_to_gnu_type above if we are processing | |
3706 | an access type for a record component designating the | |
3707 | record type itself. */ | |
3708 | if (TYPE_MODE (gnu_desig_type) == VOIDmode) | |
3709 | { | |
3710 | /* We must ensure that the pointer to variant we make will | |
3711 | be processed by update_pointer_to when the initial type | |
2ddc34ba | 3712 | is completed. Pretend we made a dummy and let further |
a1ab4c31 AC |
3713 | processing act as usual. */ |
3714 | made_dummy = true; | |
3715 | ||
3716 | /* We must ensure that update_pointer_to will not retrieve | |
3717 | the dummy variant when building a properly qualified | |
2ddc34ba | 3718 | version of the complete type. We take advantage of the |
a1ab4c31 AC |
3719 | fact that get_qualified_type is requiring TYPE_NAMEs to |
3720 | match to influence build_qualified_type and then also | |
2ddc34ba | 3721 | update_pointer_to here. */ |
a1ab4c31 AC |
3722 | TYPE_NAME (gnu_desig_type) |
3723 | = create_concat_name (gnat_desig_type, "INCOMPLETE_CST"); | |
3724 | } | |
3725 | } | |
3726 | ||
3727 | gnu_type | |
3728 | = build_pointer_type_for_mode (gnu_desig_type, p_mode, | |
3729 | No_Strict_Aliasing (gnat_entity)); | |
3730 | } | |
3731 | ||
d0c26312 | 3732 | /* If we are not defining this object and we have made a dummy pointer, |
a1ab4c31 AC |
3733 | save our current definition, evaluate the actual type, and replace |
3734 | the tentative type we made with the actual one. If we are to defer | |
d0c26312 | 3735 | actually looking up the actual type, make an entry in the deferred |
6ddf9843 EB |
3736 | list. If this is from a limited with, we may have to defer to the |
3737 | end of the current unit. */ | |
d0c26312 | 3738 | if ((!in_main_unit || is_from_limited_with) && made_dummy) |
a1ab4c31 | 3739 | { |
e3edbd56 | 3740 | tree gnu_old_desig_type; |
a1ab4c31 | 3741 | |
e3edbd56 EB |
3742 | if (TYPE_IS_FAT_POINTER_P (gnu_type)) |
3743 | { | |
3744 | gnu_old_desig_type = TYPE_UNCONSTRAINED_ARRAY (gnu_type); | |
3745 | if (esize == POINTER_SIZE) | |
3746 | gnu_type = build_pointer_type | |
3747 | (TYPE_OBJECT_RECORD_TYPE (gnu_old_desig_type)); | |
3748 | } | |
3749 | else | |
3750 | gnu_old_desig_type = TREE_TYPE (gnu_type); | |
a1ab4c31 | 3751 | |
0fb2335d | 3752 | gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list, |
a1ab4c31 AC |
3753 | !Comes_From_Source (gnat_entity), |
3754 | debug_info_p, gnat_entity); | |
3755 | this_made_decl = true; | |
3756 | gnu_type = TREE_TYPE (gnu_decl); | |
3757 | save_gnu_tree (gnat_entity, gnu_decl, false); | |
3758 | saved = true; | |
3759 | ||
d0c26312 EB |
3760 | /* Note that the call to gnat_to_gnu_type on gnat_desig_equiv might |
3761 | update gnu_old_desig_type directly, in which case it will not be | |
3762 | a dummy type any more when we get into update_pointer_to. | |
a1ab4c31 | 3763 | |
d0c26312 EB |
3764 | This can happen e.g. when the designated type is a record type, |
3765 | because their elaboration starts with an initial node from | |
3766 | make_dummy_type, which may be the same node as the one we got. | |
a1ab4c31 | 3767 | |
d0c26312 EB |
3768 | Besides, variants of this non-dummy type might have been created |
3769 | along the way. update_pointer_to is expected to properly take | |
3770 | care of those situations. */ | |
6ddf9843 | 3771 | if (defer_incomplete_level == 0 && !is_from_limited_with) |
80ec8b4c EB |
3772 | { |
3773 | defer_finalize_level++; | |
3774 | update_pointer_to (TYPE_MAIN_VARIANT (gnu_old_desig_type), | |
3775 | gnat_to_gnu_type (gnat_desig_equiv)); | |
3776 | defer_finalize_level--; | |
3777 | } | |
a1ab4c31 AC |
3778 | else |
3779 | { | |
d0c26312 | 3780 | struct incomplete *p = XNEW (struct incomplete); |
a1ab4c31 | 3781 | struct incomplete **head |
6ddf9843 | 3782 | = (is_from_limited_with |
a1ab4c31 | 3783 | ? &defer_limited_with : &defer_incomplete_list); |
d0c26312 | 3784 | p->old_type = gnu_old_desig_type; |
a1ab4c31 AC |
3785 | p->full_type = gnat_desig_equiv; |
3786 | p->next = *head; | |
3787 | *head = p; | |
3788 | } | |
3789 | } | |
3790 | } | |
3791 | break; | |
3792 | ||
3793 | case E_Access_Protected_Subprogram_Type: | |
3794 | case E_Anonymous_Access_Protected_Subprogram_Type: | |
3795 | if (type_annotate_only && No (gnat_equiv_type)) | |
3796 | gnu_type = ptr_void_type_node; | |
3797 | else | |
3798 | { | |
c01fe451 | 3799 | /* The run-time representation is the equivalent type. */ |
a1ab4c31 | 3800 | gnu_type = gnat_to_gnu_type (gnat_equiv_type); |
2ddc34ba | 3801 | maybe_present = true; |
a1ab4c31 AC |
3802 | } |
3803 | ||
3804 | if (Is_Itype (Directly_Designated_Type (gnat_entity)) | |
3805 | && !present_gnu_tree (Directly_Designated_Type (gnat_entity)) | |
3806 | && No (Freeze_Node (Directly_Designated_Type (gnat_entity))) | |
3807 | && !Is_Record_Type (Scope (Directly_Designated_Type (gnat_entity)))) | |
3808 | gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity), | |
3809 | NULL_TREE, 0); | |
3810 | ||
3811 | break; | |
3812 | ||
3813 | case E_Access_Subtype: | |
3814 | ||
3815 | /* We treat this as identical to its base type; any constraint is | |
3816 | meaningful only to the front end. | |
3817 | ||
3818 | The designated type must be elaborated as well, if it does | |
2ddc34ba | 3819 | not have its own freeze node. Designated (sub)types created |
a1ab4c31 AC |
3820 | for constrained components of records with discriminants are |
3821 | not frozen by the front end and thus not elaborated by gigi, | |
3822 | because their use may appear before the base type is frozen, | |
3823 | and because it is not clear that they are needed anywhere in | |
2ddc34ba | 3824 | Gigi. With the current model, there is no correct place where |
a1ab4c31 AC |
3825 | they could be elaborated. */ |
3826 | ||
3827 | gnu_type = gnat_to_gnu_type (Etype (gnat_entity)); | |
3828 | if (Is_Itype (Directly_Designated_Type (gnat_entity)) | |
3829 | && !present_gnu_tree (Directly_Designated_Type (gnat_entity)) | |
3830 | && Is_Frozen (Directly_Designated_Type (gnat_entity)) | |
3831 | && No (Freeze_Node (Directly_Designated_Type (gnat_entity)))) | |
3832 | { | |
3833 | /* If we are not defining this entity, and we have incomplete | |
3834 | entities being processed above us, make a dummy type and | |
3835 | elaborate it later. */ | |
3836 | if (!definition && defer_incomplete_level != 0) | |
3837 | { | |
3838 | struct incomplete *p | |
3839 | = (struct incomplete *) xmalloc (sizeof (struct incomplete)); | |
3840 | tree gnu_ptr_type | |
3841 | = build_pointer_type | |
3842 | (make_dummy_type (Directly_Designated_Type (gnat_entity))); | |
3843 | ||
3844 | p->old_type = TREE_TYPE (gnu_ptr_type); | |
3845 | p->full_type = Directly_Designated_Type (gnat_entity); | |
3846 | p->next = defer_incomplete_list; | |
3847 | defer_incomplete_list = p; | |
3848 | } | |
3849 | else if (!IN (Ekind (Base_Type | |
3850 | (Directly_Designated_Type (gnat_entity))), | |
3851 | Incomplete_Or_Private_Kind)) | |
3852 | gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity), | |
3853 | NULL_TREE, 0); | |
3854 | } | |
3855 | ||
3856 | maybe_present = true; | |
3857 | break; | |
3858 | ||
3859 | /* Subprogram Entities | |
3860 | ||
c9d84d0e | 3861 | The following access functions are defined for subprograms: |
a1ab4c31 | 3862 | |
c9d84d0e | 3863 | Etype Return type or Standard_Void_Type. |
a1ab4c31 AC |
3864 | First_Formal The first formal parameter. |
3865 | Is_Imported Indicates that the subprogram has appeared in | |
2ddc34ba | 3866 | an INTERFACE or IMPORT pragma. For now we |
a1ab4c31 AC |
3867 | assume that the external language is C. |
3868 | Is_Exported Likewise but for an EXPORT pragma. | |
3869 | Is_Inlined True if the subprogram is to be inlined. | |
3870 | ||
a1ab4c31 AC |
3871 | Each parameter is first checked by calling must_pass_by_ref on its |
3872 | type to determine if it is passed by reference. For parameters which | |
3873 | are copied in, if they are Ada In Out or Out parameters, their return | |
3874 | value becomes part of a record which becomes the return type of the | |
3875 | function (C function - note that this applies only to Ada procedures | |
2ddc34ba | 3876 | so there is no Ada return type). Additional code to store back the |
a1ab4c31 AC |
3877 | parameters will be generated on the caller side. This transformation |
3878 | is done here, not in the front-end. | |
3879 | ||
3880 | The intended result of the transformation can be seen from the | |
3881 | equivalent source rewritings that follow: | |
3882 | ||
3883 | struct temp {int a,b}; | |
3884 | procedure P (A,B: In Out ...) is temp P (int A,B) | |
3885 | begin { | |
3886 | .. .. | |
3887 | end P; return {A,B}; | |
3888 | } | |
3889 | ||
3890 | temp t; | |
3891 | P(X,Y); t = P(X,Y); | |
3892 | X = t.a , Y = t.b; | |
3893 | ||
3894 | For subprogram types we need to perform mainly the same conversions to | |
3895 | GCC form that are needed for procedures and function declarations. The | |
3896 | only difference is that at the end, we make a type declaration instead | |
3897 | of a function declaration. */ | |
3898 | ||
3899 | case E_Subprogram_Type: | |
3900 | case E_Function: | |
3901 | case E_Procedure: | |
3902 | { | |
c9d84d0e EB |
3903 | /* The type returned by a function or else Standard_Void_Type for a |
3904 | procedure. */ | |
3905 | Entity_Id gnat_return_type = Etype (gnat_entity); | |
3906 | tree gnu_return_type; | |
a1ab4c31 | 3907 | /* The first GCC parameter declaration (a PARM_DECL node). The |
e3edbd56 | 3908 | PARM_DECL nodes are chained through the DECL_CHAIN field, so this |
a1ab4c31 AC |
3909 | actually is the head of this parameter list. */ |
3910 | tree gnu_param_list = NULL_TREE; | |
3911 | /* Likewise for the stub associated with an exported procedure. */ | |
3912 | tree gnu_stub_param_list = NULL_TREE; | |
a1ab4c31 AC |
3913 | /* Non-null for subprograms containing parameters passed by copy-in |
3914 | copy-out (Ada In Out or Out parameters not passed by reference), | |
d47d0a8d EB |
3915 | in which case it is the list of nodes used to specify the values |
3916 | of the In Out/Out parameters that are returned as a record upon | |
a1ab4c31 AC |
3917 | procedure return. The TREE_PURPOSE of an element of this list is |
3918 | a field of the record and the TREE_VALUE is the PARM_DECL | |
3919 | corresponding to that field. This list will be saved in the | |
3920 | TYPE_CI_CO_LIST field of the FUNCTION_TYPE node we create. */ | |
d47d0a8d | 3921 | tree gnu_cico_list = NULL_TREE; |
c9d84d0e EB |
3922 | /* List of fields in return type of procedure with copy-in copy-out |
3923 | parameters. */ | |
3924 | tree gnu_field_list = NULL_TREE; | |
a1ab4c31 AC |
3925 | /* If an import pragma asks to map this subprogram to a GCC builtin, |
3926 | this is the builtin DECL node. */ | |
3927 | tree gnu_builtin_decl = NULL_TREE; | |
3928 | /* For the stub associated with an exported procedure. */ | |
3929 | tree gnu_stub_type = NULL_TREE, gnu_stub_name = NULL_TREE; | |
3930 | tree gnu_ext_name = create_concat_name (gnat_entity, NULL); | |
3931 | Entity_Id gnat_param; | |
3932 | bool inline_flag = Is_Inlined (gnat_entity); | |
3933 | bool public_flag = Is_Public (gnat_entity) || imported_p; | |
3934 | bool extern_flag | |
3935 | = (Is_Public (gnat_entity) && !definition) || imported_p; | |
7d7fcb08 | 3936 | bool artificial_flag = !Comes_From_Source (gnat_entity); |
255e5b04 OH |
3937 | /* The semantics of "pure" in Ada essentially matches that of "const" |
3938 | in the back-end. In particular, both properties are orthogonal to | |
3939 | the "nothrow" property if the EH circuitry is explicit in the | |
3940 | internal representation of the back-end. If we are to completely | |
3941 | hide the EH circuitry from it, we need to declare that calls to pure | |
3942 | Ada subprograms that can throw have side effects since they can | |
3943 | trigger an "abnormal" transfer of control flow; thus they can be | |
3944 | neither "const" nor "pure" in the back-end sense. */ | |
3945 | bool const_flag | |
3946 | = (Exception_Mechanism == Back_End_Exceptions | |
3947 | && Is_Pure (gnat_entity)); | |
a1ab4c31 | 3948 | bool volatile_flag = No_Return (gnat_entity); |
d47d0a8d EB |
3949 | bool return_by_direct_ref_p = false; |
3950 | bool return_by_invisi_ref_p = false; | |
3951 | bool return_unconstrained_p = false; | |
a1ab4c31 AC |
3952 | bool has_stub = false; |
3953 | int parmnum; | |
3954 | ||
8cd28148 EB |
3955 | /* A parameter may refer to this type, so defer completion of any |
3956 | incomplete types. */ | |
a1ab4c31 | 3957 | if (kind == E_Subprogram_Type && !definition) |
8cd28148 EB |
3958 | { |
3959 | defer_incomplete_level++; | |
3960 | this_deferred = true; | |
3961 | } | |
a1ab4c31 AC |
3962 | |
3963 | /* If the subprogram has an alias, it is probably inherited, so | |
3964 | we can use the original one. If the original "subprogram" | |
3965 | is actually an enumeration literal, it may be the first use | |
3966 | of its type, so we must elaborate that type now. */ | |
3967 | if (Present (Alias (gnat_entity))) | |
3968 | { | |
3969 | if (Ekind (Alias (gnat_entity)) == E_Enumeration_Literal) | |
3970 | gnat_to_gnu_entity (Etype (Alias (gnat_entity)), NULL_TREE, 0); | |
3971 | ||
c9d84d0e | 3972 | gnu_decl = gnat_to_gnu_entity (Alias (gnat_entity), gnu_expr, 0); |
a1ab4c31 AC |
3973 | |
3974 | /* Elaborate any Itypes in the parameters of this entity. */ | |
3975 | for (gnat_temp = First_Formal_With_Extras (gnat_entity); | |
3976 | Present (gnat_temp); | |
3977 | gnat_temp = Next_Formal_With_Extras (gnat_temp)) | |
3978 | if (Is_Itype (Etype (gnat_temp))) | |
3979 | gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0); | |
3980 | ||
3981 | break; | |
3982 | } | |
3983 | ||
3984 | /* If this subprogram is expectedly bound to a GCC builtin, fetch the | |
bb511fbd OH |
3985 | corresponding DECL node. Proper generation of calls later on need |
3986 | proper parameter associations so we don't "break;" here. */ | |
1515785d OH |
3987 | if (Convention (gnat_entity) == Convention_Intrinsic |
3988 | && Present (Interface_Name (gnat_entity))) | |
3989 | { | |
3990 | gnu_builtin_decl = builtin_decl_for (gnu_ext_name); | |
3991 | ||
308e6f3a | 3992 | /* Inability to find the builtin decl most often indicates a |
bb511fbd OH |
3993 | genuine mistake, but imports of unregistered intrinsics are |
3994 | sometimes issued on purpose to allow hooking in alternate | |
3995 | bodies. We post a warning conditioned on Wshadow in this case, | |
3996 | to let developers be notified on demand without risking false | |
3997 | positives with common default sets of options. */ | |
3998 | ||
3999 | if (gnu_builtin_decl == NULL_TREE && warn_shadow) | |
1515785d OH |
4000 | post_error ("?gcc intrinsic not found for&!", gnat_entity); |
4001 | } | |
a1ab4c31 AC |
4002 | |
4003 | /* ??? What if we don't find the builtin node above ? warn ? err ? | |
4004 | In the current state we neither warn nor err, and calls will just | |
2ddc34ba | 4005 | be handled as for regular subprograms. */ |
a1ab4c31 | 4006 | |
c9d84d0e EB |
4007 | /* Look into the return type and get its associated GCC tree. If it |
4008 | is not void, compute various flags for the subprogram type. */ | |
4009 | if (Ekind (gnat_return_type) == E_Void) | |
4010 | gnu_return_type = void_type_node; | |
4011 | else | |
a1ab4c31 | 4012 | { |
c9d84d0e | 4013 | gnu_return_type = gnat_to_gnu_type (gnat_return_type); |
a1ab4c31 | 4014 | |
c9d84d0e EB |
4015 | /* If this function returns by reference, make the actual return |
4016 | type the pointer type and make a note of that. */ | |
4017 | if (Returns_By_Ref (gnat_entity)) | |
4018 | { | |
4019 | gnu_return_type = build_pointer_type (gnu_return_type); | |
4020 | return_by_direct_ref_p = true; | |
4021 | } | |
a1ab4c31 | 4022 | |
c9d84d0e EB |
4023 | /* If we are supposed to return an unconstrained array type, make |
4024 | the actual return type the fat pointer type. */ | |
4025 | else if (TREE_CODE (gnu_return_type) == UNCONSTRAINED_ARRAY_TYPE) | |
4026 | { | |
4027 | gnu_return_type = TREE_TYPE (gnu_return_type); | |
4028 | return_unconstrained_p = true; | |
4029 | } | |
a1ab4c31 | 4030 | |
c9d84d0e EB |
4031 | /* Likewise, if the return type requires a transient scope, the |
4032 | return value will be allocated on the secondary stack so the | |
4033 | actual return type is the pointer type. */ | |
4034 | else if (Requires_Transient_Scope (gnat_return_type)) | |
4035 | { | |
4036 | gnu_return_type = build_pointer_type (gnu_return_type); | |
4037 | return_unconstrained_p = true; | |
4038 | } | |
a1ab4c31 | 4039 | |
c9d84d0e EB |
4040 | /* If the Mechanism is By_Reference, ensure this function uses the |
4041 | target's by-invisible-reference mechanism, which may not be the | |
4042 | same as above (e.g. it might be passing an extra parameter). */ | |
4043 | else if (kind == E_Function | |
4044 | && Mechanism (gnat_entity) == By_Reference) | |
4045 | return_by_invisi_ref_p = true; | |
4046 | ||
4047 | /* Likewise, if the return type is itself By_Reference. */ | |
4048 | else if (TREE_ADDRESSABLE (gnu_return_type)) | |
4049 | return_by_invisi_ref_p = true; | |
4050 | ||
4051 | /* If the type is a padded type and the underlying type would not | |
4052 | be passed by reference or the function has a foreign convention, | |
4053 | return the underlying type. */ | |
4054 | else if (TYPE_IS_PADDING_P (gnu_return_type) | |
4055 | && (!default_pass_by_ref | |
4056 | (TREE_TYPE (TYPE_FIELDS (gnu_return_type))) | |
4057 | || Has_Foreign_Convention (gnat_entity))) | |
4058 | gnu_return_type = TREE_TYPE (TYPE_FIELDS (gnu_return_type)); | |
4059 | ||
4060 | /* If the return type is unconstrained, that means it must have a | |
4061 | maximum size. Use the padded type as the effective return type. | |
4062 | And ensure the function uses the target's by-invisible-reference | |
4063 | mechanism to avoid copying too much data when it returns. */ | |
4064 | if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_return_type))) | |
4065 | { | |
4066 | gnu_return_type | |
4067 | = maybe_pad_type (gnu_return_type, | |
4068 | max_size (TYPE_SIZE (gnu_return_type), | |
4069 | true), | |
4070 | 0, gnat_entity, false, false, false, true); | |
51c5169c EB |
4071 | |
4072 | /* Declare it now since it will never be declared otherwise. | |
4073 | This is necessary to ensure that its subtrees are properly | |
4074 | marked. */ | |
4075 | create_type_decl (TYPE_NAME (gnu_return_type), gnu_return_type, | |
4076 | NULL, true, debug_info_p, gnat_entity); | |
4077 | ||
c9d84d0e EB |
4078 | return_by_invisi_ref_p = true; |
4079 | } | |
a1ab4c31 | 4080 | |
c9d84d0e EB |
4081 | /* If the return type has a size that overflows, we cannot have |
4082 | a function that returns that type. This usage doesn't make | |
4083 | sense anyway, so give an error here. */ | |
4084 | if (TYPE_SIZE_UNIT (gnu_return_type) | |
4085 | && TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type)) | |
4086 | && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_return_type))) | |
4087 | { | |
4088 | post_error ("cannot return type whose size overflows", | |
4089 | gnat_entity); | |
4090 | gnu_return_type = copy_node (gnu_return_type); | |
4091 | TYPE_SIZE (gnu_return_type) = bitsize_zero_node; | |
4092 | TYPE_SIZE_UNIT (gnu_return_type) = size_zero_node; | |
4093 | TYPE_MAIN_VARIANT (gnu_return_type) = gnu_return_type; | |
4094 | TYPE_NEXT_VARIANT (gnu_return_type) = NULL_TREE; | |
4095 | } | |
4096 | } | |
a1ab4c31 | 4097 | |
c9d84d0e EB |
4098 | /* Loop over the parameters and get their associated GCC tree. While |
4099 | doing this, build a copy-in copy-out structure if we need one. */ | |
a1ab4c31 AC |
4100 | for (gnat_param = First_Formal_With_Extras (gnat_entity), parmnum = 0; |
4101 | Present (gnat_param); | |
4102 | gnat_param = Next_Formal_With_Extras (gnat_param), parmnum++) | |
4103 | { | |
4104 | tree gnu_param_name = get_entity_name (gnat_param); | |
4105 | tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param)); | |
4106 | tree gnu_param, gnu_field; | |
4107 | bool copy_in_copy_out = false; | |
4108 | Mechanism_Type mech = Mechanism (gnat_param); | |
4109 | ||
4110 | /* Builtins are expanded inline and there is no real call sequence | |
4111 | involved. So the type expected by the underlying expander is | |
4112 | always the type of each argument "as is". */ | |
4113 | if (gnu_builtin_decl) | |
4114 | mech = By_Copy; | |
4115 | /* Handle the first parameter of a valued procedure specially. */ | |
4116 | else if (Is_Valued_Procedure (gnat_entity) && parmnum == 0) | |
4117 | mech = By_Copy_Return; | |
4118 | /* Otherwise, see if a Mechanism was supplied that forced this | |
4119 | parameter to be passed one way or another. */ | |
4120 | else if (mech == Default | |
4121 | || mech == By_Copy || mech == By_Reference) | |
4122 | ; | |
4123 | else if (By_Descriptor_Last <= mech && mech <= By_Descriptor) | |
4124 | mech = By_Descriptor; | |
d628c015 DR |
4125 | |
4126 | else if (By_Short_Descriptor_Last <= mech && | |
4127 | mech <= By_Short_Descriptor) | |
4128 | mech = By_Short_Descriptor; | |
4129 | ||
a1ab4c31 AC |
4130 | else if (mech > 0) |
4131 | { | |
4132 | if (TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE | |
4133 | || TREE_CODE (TYPE_SIZE (gnu_param_type)) != INTEGER_CST | |
4134 | || 0 < compare_tree_int (TYPE_SIZE (gnu_param_type), | |
4135 | mech)) | |
4136 | mech = By_Reference; | |
4137 | else | |
4138 | mech = By_Copy; | |
4139 | } | |
4140 | else | |
4141 | { | |
4142 | post_error ("unsupported mechanism for&", gnat_param); | |
4143 | mech = Default; | |
4144 | } | |
4145 | ||
4146 | gnu_param | |
4147 | = gnat_to_gnu_param (gnat_param, mech, gnat_entity, | |
4148 | Has_Foreign_Convention (gnat_entity), | |
4149 | ©_in_copy_out); | |
4150 | ||
4151 | /* We are returned either a PARM_DECL or a type if no parameter | |
4152 | needs to be passed; in either case, adjust the type. */ | |
4153 | if (DECL_P (gnu_param)) | |
4154 | gnu_param_type = TREE_TYPE (gnu_param); | |
4155 | else | |
4156 | { | |
4157 | gnu_param_type = gnu_param; | |
4158 | gnu_param = NULL_TREE; | |
4159 | } | |
4160 | ||
4304395d EB |
4161 | /* The failure of this assertion will very likely come from an |
4162 | order of elaboration issue for the type of the parameter. */ | |
4163 | gcc_assert (kind == E_Subprogram_Type | |
4164 | || !TYPE_IS_DUMMY_P (gnu_param_type)); | |
4165 | ||
a1ab4c31 AC |
4166 | if (gnu_param) |
4167 | { | |
4168 | /* If it's an exported subprogram, we build a parameter list | |
4169 | in parallel, in case we need to emit a stub for it. */ | |
4170 | if (Is_Exported (gnat_entity)) | |
4171 | { | |
4172 | gnu_stub_param_list | |
4173 | = chainon (gnu_param, gnu_stub_param_list); | |
4174 | /* Change By_Descriptor parameter to By_Reference for | |
4175 | the internal version of an exported subprogram. */ | |
d628c015 | 4176 | if (mech == By_Descriptor || mech == By_Short_Descriptor) |
a1ab4c31 AC |
4177 | { |
4178 | gnu_param | |
4179 | = gnat_to_gnu_param (gnat_param, By_Reference, | |
4180 | gnat_entity, false, | |
4181 | ©_in_copy_out); | |
4182 | has_stub = true; | |
4183 | } | |
4184 | else | |
4185 | gnu_param = copy_node (gnu_param); | |
4186 | } | |
4187 | ||
4188 | gnu_param_list = chainon (gnu_param, gnu_param_list); | |
4189 | Sloc_to_locus (Sloc (gnat_param), | |
4190 | &DECL_SOURCE_LOCATION (gnu_param)); | |
4191 | save_gnu_tree (gnat_param, gnu_param, false); | |
4192 | ||
4193 | /* If a parameter is a pointer, this function may modify | |
4194 | memory through it and thus shouldn't be considered | |
255e5b04 | 4195 | a const function. Also, the memory may be modified |
a1ab4c31 AC |
4196 | between two calls, so they can't be CSE'ed. The latter |
4197 | case also handles by-ref parameters. */ | |
4198 | if (POINTER_TYPE_P (gnu_param_type) | |
315cff15 | 4199 | || TYPE_IS_FAT_POINTER_P (gnu_param_type)) |
255e5b04 | 4200 | const_flag = false; |
a1ab4c31 AC |
4201 | } |
4202 | ||
4203 | if (copy_in_copy_out) | |
4204 | { | |
35a382b8 | 4205 | if (!gnu_cico_list) |
a1ab4c31 | 4206 | { |
35a382b8 EB |
4207 | tree gnu_new_ret_type = make_node (RECORD_TYPE); |
4208 | ||
4209 | /* If this is a function, we also need a field for the | |
4210 | return value to be placed. */ | |
4211 | if (TREE_CODE (gnu_return_type) != VOID_TYPE) | |
4212 | { | |
4213 | gnu_field | |
4214 | = create_field_decl (get_identifier ("RETVAL"), | |
4215 | gnu_return_type, | |
4216 | gnu_new_ret_type, NULL_TREE, | |
4217 | NULL_TREE, 0, 0); | |
4218 | Sloc_to_locus (Sloc (gnat_entity), | |
4219 | &DECL_SOURCE_LOCATION (gnu_field)); | |
4220 | gnu_field_list = gnu_field; | |
4221 | gnu_cico_list | |
4222 | = tree_cons (gnu_field, void_type_node, NULL_TREE); | |
4223 | } | |
4224 | ||
4225 | gnu_return_type = gnu_new_ret_type; | |
a1ab4c31 | 4226 | TYPE_NAME (gnu_return_type) = get_identifier ("RETURN"); |
19c84694 EB |
4227 | /* Set a default alignment to speed up accesses. */ |
4228 | TYPE_ALIGN (gnu_return_type) | |
4229 | = get_mode_alignment (ptr_mode); | |
a1ab4c31 AC |
4230 | } |
4231 | ||
da01bfee EB |
4232 | gnu_field |
4233 | = create_field_decl (gnu_param_name, gnu_param_type, | |
4234 | gnu_return_type, NULL_TREE, NULL_TREE, | |
4235 | 0, 0); | |
29b1c5a4 EB |
4236 | /* Set a minimum alignment to speed up accesses. */ |
4237 | if (DECL_ALIGN (gnu_field) < TYPE_ALIGN (gnu_return_type)) | |
4238 | DECL_ALIGN (gnu_field) = TYPE_ALIGN (gnu_return_type); | |
a1ab4c31 AC |
4239 | Sloc_to_locus (Sloc (gnat_param), |
4240 | &DECL_SOURCE_LOCATION (gnu_field)); | |
910ad8de | 4241 | DECL_CHAIN (gnu_field) = gnu_field_list; |
a1ab4c31 | 4242 | gnu_field_list = gnu_field; |
d47d0a8d EB |
4243 | gnu_cico_list |
4244 | = tree_cons (gnu_field, gnu_param, gnu_cico_list); | |
a1ab4c31 AC |
4245 | } |
4246 | } | |
4247 | ||
4248 | /* Do not compute record for out parameters if subprogram is | |
4249 | stubbed since structures are incomplete for the back-end. */ | |
4250 | if (gnu_field_list && Convention (gnat_entity) != Convention_Stubbed) | |
4251 | finish_record_type (gnu_return_type, nreverse (gnu_field_list), | |
032d1b71 | 4252 | 0, debug_info_p); |
a1ab4c31 AC |
4253 | |
4254 | /* If we have a CICO list but it has only one entry, we convert | |
4255 | this function into a function that simply returns that one | |
4256 | object. */ | |
d47d0a8d EB |
4257 | if (list_length (gnu_cico_list) == 1) |
4258 | gnu_return_type = TREE_TYPE (TREE_PURPOSE (gnu_cico_list)); | |
a1ab4c31 AC |
4259 | |
4260 | if (Has_Stdcall_Convention (gnat_entity)) | |
4261 | prepend_one_attribute_to | |
4262 | (&attr_list, ATTR_MACHINE_ATTRIBUTE, | |
4263 | get_identifier ("stdcall"), NULL_TREE, | |
4264 | gnat_entity); | |
4265 | ||
66194a98 OH |
4266 | /* If we should request stack realignment for a foreign convention |
4267 | subprogram, do so. Note that this applies to task entry points in | |
4268 | particular. */ | |
4269 | if (FOREIGN_FORCE_REALIGN_STACK | |
a1ab4c31 AC |
4270 | && Has_Foreign_Convention (gnat_entity)) |
4271 | prepend_one_attribute_to | |
4272 | (&attr_list, ATTR_MACHINE_ATTRIBUTE, | |
4273 | get_identifier ("force_align_arg_pointer"), NULL_TREE, | |
4274 | gnat_entity); | |
4275 | ||
4276 | /* The lists have been built in reverse. */ | |
4277 | gnu_param_list = nreverse (gnu_param_list); | |
4278 | if (has_stub) | |
4279 | gnu_stub_param_list = nreverse (gnu_stub_param_list); | |
d47d0a8d | 4280 | gnu_cico_list = nreverse (gnu_cico_list); |
a1ab4c31 | 4281 | |
4304395d | 4282 | if (kind == E_Function) |
d47d0a8d EB |
4283 | Set_Mechanism (gnat_entity, return_unconstrained_p |
4284 | || return_by_direct_ref_p | |
4285 | || return_by_invisi_ref_p | |
4286 | ? By_Reference : By_Copy); | |
a1ab4c31 AC |
4287 | gnu_type |
4288 | = create_subprog_type (gnu_return_type, gnu_param_list, | |
d47d0a8d EB |
4289 | gnu_cico_list, return_unconstrained_p, |
4290 | return_by_direct_ref_p, | |
4291 | return_by_invisi_ref_p); | |
a1ab4c31 AC |
4292 | |
4293 | if (has_stub) | |
4294 | gnu_stub_type | |
4295 | = create_subprog_type (gnu_return_type, gnu_stub_param_list, | |
d47d0a8d EB |
4296 | gnu_cico_list, return_unconstrained_p, |
4297 | return_by_direct_ref_p, | |
4298 | return_by_invisi_ref_p); | |
a1ab4c31 AC |
4299 | |
4300 | /* A subprogram (something that doesn't return anything) shouldn't | |
255e5b04 | 4301 | be considered const since there would be no reason for such a |
a1ab4c31 | 4302 | subprogram. Note that procedures with Out (or In Out) parameters |
2ddc34ba | 4303 | have already been converted into a function with a return type. */ |
a1ab4c31 | 4304 | if (TREE_CODE (gnu_return_type) == VOID_TYPE) |
255e5b04 | 4305 | const_flag = false; |
2eee5152 | 4306 | |
a1ab4c31 AC |
4307 | gnu_type |
4308 | = build_qualified_type (gnu_type, | |
4309 | TYPE_QUALS (gnu_type) | |
255e5b04 | 4310 | | (TYPE_QUAL_CONST * const_flag) |
a1ab4c31 AC |
4311 | | (TYPE_QUAL_VOLATILE * volatile_flag)); |
4312 | ||
a1ab4c31 AC |
4313 | if (has_stub) |
4314 | gnu_stub_type | |
4315 | = build_qualified_type (gnu_stub_type, | |
4316 | TYPE_QUALS (gnu_stub_type) | |
255e5b04 | 4317 | | (TYPE_QUAL_CONST * const_flag) |
a1ab4c31 AC |
4318 | | (TYPE_QUAL_VOLATILE * volatile_flag)); |
4319 | ||
1515785d OH |
4320 | /* If we have a builtin decl for that function, use it. Check if the |
4321 | profiles are compatible and warn if they are not. The checker is | |
4322 | expected to post extra diagnostics in this case. */ | |
a1ab4c31 AC |
4323 | if (gnu_builtin_decl) |
4324 | { | |
1515785d | 4325 | intrin_binding_t inb; |
a1ab4c31 | 4326 | |
1515785d OH |
4327 | inb.gnat_entity = gnat_entity; |
4328 | inb.ada_fntype = gnu_type; | |
4329 | inb.btin_fntype = TREE_TYPE (gnu_builtin_decl); | |
4330 | ||
4331 | if (!intrin_profiles_compatible_p (&inb)) | |
4332 | post_error | |
bb511fbd | 4333 | ("?profile of& doesn''t match the builtin it binds!", |
1515785d OH |
4334 | gnat_entity); |
4335 | ||
4336 | gnu_decl = gnu_builtin_decl; | |
4337 | gnu_type = TREE_TYPE (gnu_builtin_decl); | |
4338 | break; | |
a1ab4c31 AC |
4339 | } |
4340 | ||
4341 | /* If there was no specified Interface_Name and the external and | |
4342 | internal names of the subprogram are the same, only use the | |
4343 | internal name to allow disambiguation of nested subprograms. */ | |
0fb2335d EB |
4344 | if (No (Interface_Name (gnat_entity)) |
4345 | && gnu_ext_name == gnu_entity_name) | |
a1ab4c31 AC |
4346 | gnu_ext_name = NULL_TREE; |
4347 | ||
4348 | /* If we are defining the subprogram and it has an Address clause | |
4349 | we must get the address expression from the saved GCC tree for the | |
4350 | subprogram if it has a Freeze_Node. Otherwise, we elaborate | |
4351 | the address expression here since the front-end has guaranteed | |
4352 | in that case that the elaboration has no effects. If there is | |
4353 | an Address clause and we are not defining the object, just | |
4354 | make it a constant. */ | |
4355 | if (Present (Address_Clause (gnat_entity))) | |
4356 | { | |
4357 | tree gnu_address = NULL_TREE; | |
4358 | ||
4359 | if (definition) | |
4360 | gnu_address | |
4361 | = (present_gnu_tree (gnat_entity) | |
4362 | ? get_gnu_tree (gnat_entity) | |
4363 | : gnat_to_gnu (Expression (Address_Clause (gnat_entity)))); | |
4364 | ||
4365 | save_gnu_tree (gnat_entity, NULL_TREE, false); | |
4366 | ||
4367 | /* Convert the type of the object to a reference type that can | |
4368 | alias everything as per 13.3(19). */ | |
4369 | gnu_type | |
4370 | = build_reference_type_for_mode (gnu_type, ptr_mode, true); | |
4371 | if (gnu_address) | |
4372 | gnu_address = convert (gnu_type, gnu_address); | |
4373 | ||
4374 | gnu_decl | |
0fb2335d | 4375 | = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type, |
a1ab4c31 AC |
4376 | gnu_address, false, Is_Public (gnat_entity), |
4377 | extern_flag, false, NULL, gnat_entity); | |
4378 | DECL_BY_REF_P (gnu_decl) = 1; | |
4379 | } | |
4380 | ||
4381 | else if (kind == E_Subprogram_Type) | |
7d7fcb08 EB |
4382 | gnu_decl |
4383 | = create_type_decl (gnu_entity_name, gnu_type, attr_list, | |
4384 | artificial_flag, debug_info_p, gnat_entity); | |
a1ab4c31 AC |
4385 | else |
4386 | { | |
4387 | if (has_stub) | |
4388 | { | |
4389 | gnu_stub_name = gnu_ext_name; | |
4390 | gnu_ext_name = create_concat_name (gnat_entity, "internal"); | |
4391 | public_flag = false; | |
7d7fcb08 | 4392 | artificial_flag = true; |
a1ab4c31 AC |
4393 | } |
4394 | ||
7d7fcb08 EB |
4395 | gnu_decl |
4396 | = create_subprog_decl (gnu_entity_name, gnu_ext_name, gnu_type, | |
4397 | gnu_param_list, inline_flag, public_flag, | |
4398 | extern_flag, artificial_flag, attr_list, | |
4399 | gnat_entity); | |
a1ab4c31 AC |
4400 | if (has_stub) |
4401 | { | |
4402 | tree gnu_stub_decl | |
0fb2335d | 4403 | = create_subprog_decl (gnu_entity_name, gnu_stub_name, |
a1ab4c31 | 4404 | gnu_stub_type, gnu_stub_param_list, |
7d7fcb08 EB |
4405 | inline_flag, true, extern_flag, |
4406 | false, attr_list, gnat_entity); | |
a1ab4c31 AC |
4407 | SET_DECL_FUNCTION_STUB (gnu_decl, gnu_stub_decl); |
4408 | } | |
4409 | ||
4410 | /* This is unrelated to the stub built right above. */ | |
4411 | DECL_STUBBED_P (gnu_decl) | |
4412 | = Convention (gnat_entity) == Convention_Stubbed; | |
4413 | } | |
4414 | } | |
4415 | break; | |
4416 | ||
4417 | case E_Incomplete_Type: | |
4418 | case E_Incomplete_Subtype: | |
4419 | case E_Private_Type: | |
4420 | case E_Private_Subtype: | |
4421 | case E_Limited_Private_Type: | |
4422 | case E_Limited_Private_Subtype: | |
4423 | case E_Record_Type_With_Private: | |
4424 | case E_Record_Subtype_With_Private: | |
4425 | { | |
4426 | /* Get the "full view" of this entity. If this is an incomplete | |
4427 | entity from a limited with, treat its non-limited view as the | |
4428 | full view. Otherwise, use either the full view or the underlying | |
4429 | full view, whichever is present. This is used in all the tests | |
4430 | below. */ | |
4431 | Entity_Id full_view | |
4304395d | 4432 | = (IN (kind, Incomplete_Kind) && From_With_Type (gnat_entity)) |
a1ab4c31 AC |
4433 | ? Non_Limited_View (gnat_entity) |
4434 | : Present (Full_View (gnat_entity)) | |
4435 | ? Full_View (gnat_entity) | |
4436 | : Underlying_Full_View (gnat_entity); | |
4437 | ||
4438 | /* If this is an incomplete type with no full view, it must be a Taft | |
4439 | Amendment type, in which case we return a dummy type. Otherwise, | |
4440 | just get the type from its Etype. */ | |
4441 | if (No (full_view)) | |
4442 | { | |
4443 | if (kind == E_Incomplete_Type) | |
10069d53 EB |
4444 | { |
4445 | gnu_type = make_dummy_type (gnat_entity); | |
4446 | gnu_decl = TYPE_STUB_DECL (gnu_type); | |
4447 | } | |
a1ab4c31 AC |
4448 | else |
4449 | { | |
4450 | gnu_decl = gnat_to_gnu_entity (Etype (gnat_entity), | |
4451 | NULL_TREE, 0); | |
4452 | maybe_present = true; | |
4453 | } | |
4454 | break; | |
4455 | } | |
4456 | ||
4457 | /* If we already made a type for the full view, reuse it. */ | |
4458 | else if (present_gnu_tree (full_view)) | |
4459 | { | |
4460 | gnu_decl = get_gnu_tree (full_view); | |
4461 | break; | |
4462 | } | |
4463 | ||
4464 | /* Otherwise, if we are not defining the type now, get the type | |
4465 | from the full view. But always get the type from the full view | |
4466 | for define on use types, since otherwise we won't see them! */ | |
4467 | else if (!definition | |
4468 | || (Is_Itype (full_view) | |
4469 | && No (Freeze_Node (gnat_entity))) | |
4470 | || (Is_Itype (gnat_entity) | |
4471 | && No (Freeze_Node (full_view)))) | |
4472 | { | |
4473 | gnu_decl = gnat_to_gnu_entity (full_view, NULL_TREE, 0); | |
4474 | maybe_present = true; | |
4475 | break; | |
4476 | } | |
4477 | ||
4478 | /* For incomplete types, make a dummy type entry which will be | |
10069d53 EB |
4479 | replaced later. Save it as the full declaration's type so |
4480 | we can do any needed updates when we see it. */ | |
a1ab4c31 | 4481 | gnu_type = make_dummy_type (gnat_entity); |
10069d53 | 4482 | gnu_decl = TYPE_STUB_DECL (gnu_type); |
65444786 EB |
4483 | if (Has_Completion_In_Body (gnat_entity)) |
4484 | DECL_TAFT_TYPE_P (gnu_decl) = 1; | |
a1ab4c31 AC |
4485 | save_gnu_tree (full_view, gnu_decl, 0); |
4486 | break; | |
4487 | } | |
4488 | ||
a1ab4c31 | 4489 | case E_Class_Wide_Type: |
f08863f9 | 4490 | /* Class-wide types are always transformed into their root type. */ |
a1ab4c31 AC |
4491 | gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0); |
4492 | maybe_present = true; | |
4493 | break; | |
4494 | ||
4495 | case E_Task_Type: | |
4496 | case E_Task_Subtype: | |
4497 | case E_Protected_Type: | |
4498 | case E_Protected_Subtype: | |
e6bdd039 | 4499 | /* Concurrent types are always transformed into their record type. */ |
a1ab4c31 AC |
4500 | if (type_annotate_only && No (gnat_equiv_type)) |
4501 | gnu_type = void_type_node; | |
4502 | else | |
e6bdd039 | 4503 | gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0); |
a1ab4c31 AC |
4504 | maybe_present = true; |
4505 | break; | |
4506 | ||
4507 | case E_Label: | |
0fb2335d | 4508 | gnu_decl = create_label_decl (gnu_entity_name); |
a1ab4c31 AC |
4509 | break; |
4510 | ||
4511 | case E_Block: | |
4512 | case E_Loop: | |
4513 | /* Nothing at all to do here, so just return an ERROR_MARK and claim | |
4514 | we've already saved it, so we don't try to. */ | |
4515 | gnu_decl = error_mark_node; | |
4516 | saved = true; | |
4517 | break; | |
4518 | ||
4519 | default: | |
4520 | gcc_unreachable (); | |
4521 | } | |
4522 | ||
4523 | /* If we had a case where we evaluated another type and it might have | |
4524 | defined this one, handle it here. */ | |
4525 | if (maybe_present && present_gnu_tree (gnat_entity)) | |
4526 | { | |
4527 | gnu_decl = get_gnu_tree (gnat_entity); | |
4528 | saved = true; | |
4529 | } | |
4530 | ||
4531 | /* If we are processing a type and there is either no decl for it or | |
4532 | we just made one, do some common processing for the type, such as | |
4533 | handling alignment and possible padding. */ | |
a8e05f92 | 4534 | if (is_type && (!gnu_decl || this_made_decl)) |
a1ab4c31 | 4535 | { |
76af763d EB |
4536 | /* Tell the middle-end that objects of tagged types are guaranteed to |
4537 | be properly aligned. This is necessary because conversions to the | |
4538 | class-wide type are translated into conversions to the root type, | |
4539 | which can be less aligned than some of its derived types. */ | |
a1ab4c31 AC |
4540 | if (Is_Tagged_Type (gnat_entity) |
4541 | || Is_Class_Wide_Equivalent_Type (gnat_entity)) | |
4542 | TYPE_ALIGN_OK (gnu_type) = 1; | |
4543 | ||
cb3d597d EB |
4544 | /* If the type is passed by reference, objects of this type must be |
4545 | fully addressable and cannot be copied. */ | |
4546 | if (Is_By_Reference_Type (gnat_entity)) | |
4547 | TREE_ADDRESSABLE (gnu_type) = 1; | |
a1ab4c31 AC |
4548 | |
4549 | /* ??? Don't set the size for a String_Literal since it is either | |
4550 | confirming or we don't handle it properly (if the low bound is | |
4551 | non-constant). */ | |
4552 | if (!gnu_size && kind != E_String_Literal_Subtype) | |
4553 | gnu_size = validate_size (Esize (gnat_entity), gnu_type, gnat_entity, | |
4554 | TYPE_DECL, false, | |
4555 | Has_Size_Clause (gnat_entity)); | |
4556 | ||
4557 | /* If a size was specified, see if we can make a new type of that size | |
4558 | by rearranging the type, for example from a fat to a thin pointer. */ | |
4559 | if (gnu_size) | |
4560 | { | |
4561 | gnu_type | |
4562 | = make_type_from_size (gnu_type, gnu_size, | |
4563 | Has_Biased_Representation (gnat_entity)); | |
4564 | ||
4565 | if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0) | |
4566 | && operand_equal_p (rm_size (gnu_type), gnu_size, 0)) | |
4567 | gnu_size = 0; | |
4568 | } | |
4569 | ||
4570 | /* If the alignment hasn't already been processed and this is | |
4571 | not an unconstrained array, see if an alignment is specified. | |
4572 | If not, we pick a default alignment for atomic objects. */ | |
4573 | if (align != 0 || TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE) | |
4574 | ; | |
4575 | else if (Known_Alignment (gnat_entity)) | |
4576 | { | |
4577 | align = validate_alignment (Alignment (gnat_entity), gnat_entity, | |
4578 | TYPE_ALIGN (gnu_type)); | |
4579 | ||
4580 | /* Warn on suspiciously large alignments. This should catch | |
4581 | errors about the (alignment,byte)/(size,bit) discrepancy. */ | |
4582 | if (align > BIGGEST_ALIGNMENT && Has_Alignment_Clause (gnat_entity)) | |
4583 | { | |
4584 | tree size; | |
4585 | ||
4586 | /* If a size was specified, take it into account. Otherwise | |
4587 | use the RM size for records as the type size has already | |
4588 | been adjusted to the alignment. */ | |
4589 | if (gnu_size) | |
4590 | size = gnu_size; | |
4591 | else if ((TREE_CODE (gnu_type) == RECORD_TYPE | |
4592 | || TREE_CODE (gnu_type) == UNION_TYPE | |
4593 | || TREE_CODE (gnu_type) == QUAL_UNION_TYPE) | |
315cff15 | 4594 | && !TYPE_FAT_POINTER_P (gnu_type)) |
a1ab4c31 AC |
4595 | size = rm_size (gnu_type); |
4596 | else | |
4597 | size = TYPE_SIZE (gnu_type); | |
4598 | ||
4599 | /* Consider an alignment as suspicious if the alignment/size | |
4600 | ratio is greater or equal to the byte/bit ratio. */ | |
4601 | if (host_integerp (size, 1) | |
4602 | && align >= TREE_INT_CST_LOW (size) * BITS_PER_UNIT) | |
4603 | post_error_ne ("?suspiciously large alignment specified for&", | |
4604 | Expression (Alignment_Clause (gnat_entity)), | |
4605 | gnat_entity); | |
4606 | } | |
4607 | } | |
4608 | else if (Is_Atomic (gnat_entity) && !gnu_size | |
4609 | && host_integerp (TYPE_SIZE (gnu_type), 1) | |
4610 | && integer_pow2p (TYPE_SIZE (gnu_type))) | |
4611 | align = MIN (BIGGEST_ALIGNMENT, | |
4612 | tree_low_cst (TYPE_SIZE (gnu_type), 1)); | |
4613 | else if (Is_Atomic (gnat_entity) && gnu_size | |
4614 | && host_integerp (gnu_size, 1) | |
4615 | && integer_pow2p (gnu_size)) | |
4616 | align = MIN (BIGGEST_ALIGNMENT, tree_low_cst (gnu_size, 1)); | |
4617 | ||
4618 | /* See if we need to pad the type. If we did, and made a record, | |
4619 | the name of the new type may be changed. So get it back for | |
4620 | us when we make the new TYPE_DECL below. */ | |
4621 | if (gnu_size || align > 0) | |
4622 | gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity, | |
9a1c0fd9 | 4623 | false, !gnu_decl, definition, false); |
a1ab4c31 | 4624 | |
315cff15 | 4625 | if (TYPE_IS_PADDING_P (gnu_type)) |
a1ab4c31 | 4626 | { |
0fb2335d EB |
4627 | gnu_entity_name = TYPE_NAME (gnu_type); |
4628 | if (TREE_CODE (gnu_entity_name) == TYPE_DECL) | |
4629 | gnu_entity_name = DECL_NAME (gnu_entity_name); | |
a1ab4c31 AC |
4630 | } |
4631 | ||
4632 | set_rm_size (RM_Size (gnat_entity), gnu_type, gnat_entity); | |
4633 | ||
4634 | /* If we are at global level, GCC will have applied variable_size to | |
4635 | the type, but that won't have done anything. So, if it's not | |
4636 | a constant or self-referential, call elaborate_expression_1 to | |
4637 | make a variable for the size rather than calculating it each time. | |
4638 | Handle both the RM size and the actual size. */ | |
4639 | if (global_bindings_p () | |
4640 | && TYPE_SIZE (gnu_type) | |
4641 | && !TREE_CONSTANT (TYPE_SIZE (gnu_type)) | |
4642 | && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))) | |
4643 | { | |
da01bfee EB |
4644 | tree size = TYPE_SIZE (gnu_type); |
4645 | ||
4646 | TYPE_SIZE (gnu_type) | |
4647 | = elaborate_expression_1 (size, gnat_entity, | |
4648 | get_identifier ("SIZE"), | |
4649 | definition, false); | |
4650 | ||
4651 | /* ??? For now, store the size as a multiple of the alignment in | |
4652 | bytes so that we can see the alignment from the tree. */ | |
4653 | TYPE_SIZE_UNIT (gnu_type) | |
4654 | = elaborate_expression_2 (TYPE_SIZE_UNIT (gnu_type), gnat_entity, | |
4655 | get_identifier ("SIZE_A_UNIT"), | |
4656 | definition, false, | |
4657 | TYPE_ALIGN (gnu_type)); | |
4658 | ||
4659 | /* ??? gnu_type may come from an existing type so the MULT_EXPR node | |
4660 | may not be marked by the call to create_type_decl below. */ | |
4661 | MARK_VISITED (TYPE_SIZE_UNIT (gnu_type)); | |
4662 | ||
4663 | if (TREE_CODE (gnu_type) == RECORD_TYPE) | |
a1ab4c31 | 4664 | { |
35e2a4b8 | 4665 | tree variant_part = get_variant_part (gnu_type); |
da01bfee | 4666 | tree ada_size = TYPE_ADA_SIZE (gnu_type); |
a1ab4c31 | 4667 | |
35e2a4b8 EB |
4668 | if (variant_part) |
4669 | { | |
4670 | tree union_type = TREE_TYPE (variant_part); | |
4671 | tree offset = DECL_FIELD_OFFSET (variant_part); | |
4672 | ||
4673 | /* If the position of the variant part is constant, subtract | |
4674 | it from the size of the type of the parent to get the new | |
4675 | size. This manual CSE reduces the data size. */ | |
4676 | if (TREE_CODE (offset) == INTEGER_CST) | |
4677 | { | |
4678 | tree bitpos = DECL_FIELD_BIT_OFFSET (variant_part); | |
4679 | TYPE_SIZE (union_type) | |
4680 | = size_binop (MINUS_EXPR, TYPE_SIZE (gnu_type), | |
4681 | bit_from_pos (offset, bitpos)); | |
4682 | TYPE_SIZE_UNIT (union_type) | |
4683 | = size_binop (MINUS_EXPR, TYPE_SIZE_UNIT (gnu_type), | |
4684 | byte_from_pos (offset, bitpos)); | |
4685 | } | |
4686 | else | |
4687 | { | |
4688 | TYPE_SIZE (union_type) | |
4689 | = elaborate_expression_1 (TYPE_SIZE (union_type), | |
4690 | gnat_entity, | |
4691 | get_identifier ("VSIZE"), | |
4692 | definition, false); | |
4693 | ||
4694 | /* ??? For now, store the size as a multiple of the | |
4695 | alignment in bytes so that we can see the alignment | |
4696 | from the tree. */ | |
4697 | TYPE_SIZE_UNIT (union_type) | |
4698 | = elaborate_expression_2 (TYPE_SIZE_UNIT (union_type), | |
4699 | gnat_entity, | |
4700 | get_identifier | |
4701 | ("VSIZE_A_UNIT"), | |
4702 | definition, false, | |
4703 | TYPE_ALIGN (union_type)); | |
4704 | ||
4705 | /* ??? For now, store the offset as a multiple of the | |
4706 | alignment in bytes so that we can see the alignment | |
4707 | from the tree. */ | |
4708 | DECL_FIELD_OFFSET (variant_part) | |
4709 | = elaborate_expression_2 (offset, | |
4710 | gnat_entity, | |
4711 | get_identifier ("VOFFSET"), | |
4712 | definition, false, | |
4713 | DECL_OFFSET_ALIGN | |
4714 | (variant_part)); | |
4715 | } | |
4716 | ||
4717 | DECL_SIZE (variant_part) = TYPE_SIZE (union_type); | |
4718 | DECL_SIZE_UNIT (variant_part) = TYPE_SIZE_UNIT (union_type); | |
4719 | } | |
4720 | ||
da01bfee EB |
4721 | if (operand_equal_p (ada_size, size, 0)) |
4722 | ada_size = TYPE_SIZE (gnu_type); | |
4723 | else | |
4724 | ada_size | |
4725 | = elaborate_expression_1 (ada_size, gnat_entity, | |
4726 | get_identifier ("RM_SIZE"), | |
4727 | definition, false); | |
4728 | SET_TYPE_ADA_SIZE (gnu_type, ada_size); | |
4729 | } | |
a1ab4c31 AC |
4730 | } |
4731 | ||
4732 | /* If this is a record type or subtype, call elaborate_expression_1 on | |
4733 | any field position. Do this for both global and local types. | |
4734 | Skip any fields that we haven't made trees for to avoid problems with | |
4735 | class wide types. */ | |
4736 | if (IN (kind, Record_Kind)) | |
4737 | for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp); | |
4738 | gnat_temp = Next_Entity (gnat_temp)) | |
4739 | if (Ekind (gnat_temp) == E_Component && present_gnu_tree (gnat_temp)) | |
4740 | { | |
4741 | tree gnu_field = get_gnu_tree (gnat_temp); | |
4742 | ||
da01bfee EB |
4743 | /* ??? For now, store the offset as a multiple of the alignment |
4744 | in bytes so that we can see the alignment from the tree. */ | |
a1ab4c31 AC |
4745 | if (!CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (gnu_field))) |
4746 | { | |
da01bfee EB |
4747 | DECL_FIELD_OFFSET (gnu_field) |
4748 | = elaborate_expression_2 (DECL_FIELD_OFFSET (gnu_field), | |
4749 | gnat_temp, | |
4750 | get_identifier ("OFFSET"), | |
4751 | definition, false, | |
4752 | DECL_OFFSET_ALIGN (gnu_field)); | |
4753 | ||
4754 | /* ??? The context of gnu_field is not necessarily gnu_type | |
4755 | so the MULT_EXPR node built above may not be marked by | |
4756 | the call to create_type_decl below. */ | |
4757 | if (global_bindings_p ()) | |
4758 | MARK_VISITED (DECL_FIELD_OFFSET (gnu_field)); | |
a1ab4c31 AC |
4759 | } |
4760 | } | |
4761 | ||
7c20033e EB |
4762 | if (Treat_As_Volatile (gnat_entity)) |
4763 | gnu_type | |
4764 | = build_qualified_type (gnu_type, | |
4765 | TYPE_QUALS (gnu_type) | TYPE_QUAL_VOLATILE); | |
a1ab4c31 AC |
4766 | |
4767 | if (Is_Atomic (gnat_entity)) | |
4768 | check_ok_for_atomic (gnu_type, gnat_entity, false); | |
4769 | ||
4770 | if (Present (Alignment_Clause (gnat_entity))) | |
4771 | TYPE_USER_ALIGN (gnu_type) = 1; | |
4772 | ||
4773 | if (Universal_Aliasing (gnat_entity)) | |
4774 | TYPE_UNIVERSAL_ALIASING_P (TYPE_MAIN_VARIANT (gnu_type)) = 1; | |
4775 | ||
4776 | if (!gnu_decl) | |
0fb2335d | 4777 | gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list, |
a1ab4c31 AC |
4778 | !Comes_From_Source (gnat_entity), |
4779 | debug_info_p, gnat_entity); | |
4780 | else | |
9a1c0fd9 EB |
4781 | { |
4782 | TREE_TYPE (gnu_decl) = gnu_type; | |
4783 | TYPE_STUB_DECL (gnu_type) = gnu_decl; | |
4784 | } | |
a1ab4c31 AC |
4785 | } |
4786 | ||
a8e05f92 | 4787 | if (is_type && !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl))) |
a1ab4c31 AC |
4788 | { |
4789 | gnu_type = TREE_TYPE (gnu_decl); | |
4790 | ||
794511d2 EB |
4791 | /* If this is a derived type, relate its alias set to that of its parent |
4792 | to avoid troubles when a call to an inherited primitive is inlined in | |
4793 | a context where a derived object is accessed. The inlined code works | |
4794 | on the parent view so the resulting code may access the same object | |
4795 | using both the parent and the derived alias sets, which thus have to | |
4796 | conflict. As the same issue arises with component references, the | |
4797 | parent alias set also has to conflict with composite types enclosing | |
4798 | derived components. For instance, if we have: | |
4799 | ||
4800 | type D is new T; | |
4801 | type R is record | |
4802 | Component : D; | |
4803 | end record; | |
4804 | ||
4805 | we want T to conflict with both D and R, in addition to R being a | |
4806 | superset of D by record/component construction. | |
4807 | ||
4808 | One way to achieve this is to perform an alias set copy from the | |
4809 | parent to the derived type. This is not quite appropriate, though, | |
4810 | as we don't want separate derived types to conflict with each other: | |
4811 | ||
4812 | type I1 is new Integer; | |
4813 | type I2 is new Integer; | |
4814 | ||
4815 | We want I1 and I2 to both conflict with Integer but we do not want | |
4816 | I1 to conflict with I2, and an alias set copy on derivation would | |
4817 | have that effect. | |
4818 | ||
4819 | The option chosen is to make the alias set of the derived type a | |
4820 | superset of that of its parent type. It trivially fulfills the | |
4821 | simple requirement for the Integer derivation example above, and | |
4822 | the component case as well by superset transitivity: | |
4823 | ||
4824 | superset superset | |
4825 | R ----------> D ----------> T | |
4826 | ||
d8e94f79 EB |
4827 | However, for composite types, conversions between derived types are |
4828 | translated into VIEW_CONVERT_EXPRs so a sequence like: | |
4829 | ||
4830 | type Comp1 is new Comp; | |
4831 | type Comp2 is new Comp; | |
4832 | procedure Proc (C : Comp1); | |
4833 | ||
4834 | C : Comp2; | |
4835 | Proc (Comp1 (C)); | |
4836 | ||
4837 | is translated into: | |
4838 | ||
4839 | C : Comp2; | |
4840 | Proc ((Comp1 &) &VIEW_CONVERT_EXPR <Comp1> (C)); | |
4841 | ||
4842 | and gimplified into: | |
4843 | ||
4844 | C : Comp2; | |
4845 | Comp1 *C.0; | |
4846 | C.0 = (Comp1 *) &C; | |
4847 | Proc (C.0); | |
4848 | ||
4849 | i.e. generates code involving type punning. Therefore, Comp1 needs | |
4850 | to conflict with Comp2 and an alias set copy is required. | |
4851 | ||
794511d2 EB |
4852 | The language rules ensure the parent type is already frozen here. */ |
4853 | if (Is_Derived_Type (gnat_entity)) | |
4854 | { | |
4855 | tree gnu_parent_type = gnat_to_gnu_type (Etype (gnat_entity)); | |
d8e94f79 EB |
4856 | relate_alias_sets (gnu_type, gnu_parent_type, |
4857 | Is_Composite_Type (gnat_entity) | |
4858 | ? ALIAS_SET_COPY : ALIAS_SET_SUPERSET); | |
794511d2 EB |
4859 | } |
4860 | ||
a1ab4c31 AC |
4861 | /* Back-annotate the Alignment of the type if not already in the |
4862 | tree. Likewise for sizes. */ | |
4863 | if (Unknown_Alignment (gnat_entity)) | |
caa9d12a EB |
4864 | { |
4865 | unsigned int double_align, align; | |
4866 | bool is_capped_double, align_clause; | |
4867 | ||
4868 | /* If the default alignment of "double" or larger scalar types is | |
4869 | specifically capped and this is not an array with an alignment | |
4870 | clause on the component type, return the cap. */ | |
4871 | if ((double_align = double_float_alignment) > 0) | |
4872 | is_capped_double | |
4873 | = is_double_float_or_array (gnat_entity, &align_clause); | |
4874 | else if ((double_align = double_scalar_alignment) > 0) | |
4875 | is_capped_double | |
4876 | = is_double_scalar_or_array (gnat_entity, &align_clause); | |
4877 | else | |
4878 | is_capped_double = align_clause = false; | |
4879 | ||
4880 | if (is_capped_double && !align_clause) | |
4881 | align = double_align; | |
4882 | else | |
4883 | align = TYPE_ALIGN (gnu_type) / BITS_PER_UNIT; | |
4884 | ||
4885 | Set_Alignment (gnat_entity, UI_From_Int (align)); | |
4886 | } | |
a1ab4c31 AC |
4887 | |
4888 | if (Unknown_Esize (gnat_entity) && TYPE_SIZE (gnu_type)) | |
4889 | { | |
a1ab4c31 AC |
4890 | tree gnu_size = TYPE_SIZE (gnu_type); |
4891 | ||
58c8f770 | 4892 | /* If the size is self-referential, annotate the maximum value. */ |
a1ab4c31 AC |
4893 | if (CONTAINS_PLACEHOLDER_P (gnu_size)) |
4894 | gnu_size = max_size (gnu_size, true); | |
4895 | ||
a1ab4c31 AC |
4896 | if (type_annotate_only && Is_Tagged_Type (gnat_entity)) |
4897 | { | |
58c8f770 EB |
4898 | /* In this mode, the tag and the parent components are not |
4899 | generated by the front-end so the sizes must be adjusted. */ | |
4900 | tree pointer_size = bitsize_int (POINTER_SIZE), offset; | |
4901 | Uint uint_size; | |
a1ab4c31 AC |
4902 | |
4903 | if (Is_Derived_Type (gnat_entity)) | |
4904 | { | |
58c8f770 EB |
4905 | offset = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))), |
4906 | bitsizetype); | |
a1ab4c31 AC |
4907 | Set_Alignment (gnat_entity, |
4908 | Alignment (Etype (Base_Type (gnat_entity)))); | |
4909 | } | |
4910 | else | |
58c8f770 EB |
4911 | offset = pointer_size; |
4912 | ||
4913 | gnu_size = size_binop (PLUS_EXPR, gnu_size, offset); | |
4914 | gnu_size = size_binop (MULT_EXPR, pointer_size, | |
4915 | size_binop (CEIL_DIV_EXPR, | |
4916 | gnu_size, | |
4917 | pointer_size)); | |
4918 | uint_size = annotate_value (gnu_size); | |
4919 | Set_Esize (gnat_entity, uint_size); | |
4920 | Set_RM_Size (gnat_entity, uint_size); | |
a1ab4c31 | 4921 | } |
58c8f770 EB |
4922 | else |
4923 | Set_Esize (gnat_entity, annotate_value (gnu_size)); | |
a1ab4c31 AC |
4924 | } |
4925 | ||
4926 | if (Unknown_RM_Size (gnat_entity) && rm_size (gnu_type)) | |
4927 | Set_RM_Size (gnat_entity, annotate_value (rm_size (gnu_type))); | |
4928 | } | |
4929 | ||
d0edecea | 4930 | /* If we really have a ..._DECL node, set a couple of flags on it. But we |
7d7fcb08 EB |
4931 | cannot do so if we are reusing the ..._DECL node made for an alias or a |
4932 | renamed object as the predicates don't apply to it but to GNAT_ENTITY. */ | |
4933 | if (DECL_P (gnu_decl) | |
4934 | && !Present (Alias (gnat_entity)) | |
4935 | && !(Present (Renamed_Object (gnat_entity)) && saved)) | |
d0edecea EB |
4936 | { |
4937 | if (!Comes_From_Source (gnat_entity)) | |
4938 | DECL_ARTIFICIAL (gnu_decl) = 1; | |
a1ab4c31 | 4939 | |
7d7fcb08 | 4940 | if (!debug_info_p) |
d0edecea EB |
4941 | DECL_IGNORED_P (gnu_decl) = 1; |
4942 | } | |
a1ab4c31 AC |
4943 | |
4944 | /* If we haven't already, associate the ..._DECL node that we just made with | |
2ddc34ba | 4945 | the input GNAT entity node. */ |
a1ab4c31 AC |
4946 | if (!saved) |
4947 | save_gnu_tree (gnat_entity, gnu_decl, false); | |
4948 | ||
c1abd261 EB |
4949 | /* If this is an enumeration or floating-point type, we were not able to set |
4950 | the bounds since they refer to the type. These are always static. */ | |
a1ab4c31 AC |
4951 | if ((kind == E_Enumeration_Type && Present (First_Literal (gnat_entity))) |
4952 | || (kind == E_Floating_Point_Type && !Vax_Float (gnat_entity))) | |
4953 | { | |
4954 | tree gnu_scalar_type = gnu_type; | |
84fb43a1 | 4955 | tree gnu_low_bound, gnu_high_bound; |
a1ab4c31 AC |
4956 | |
4957 | /* If this is a padded type, we need to use the underlying type. */ | |
315cff15 | 4958 | if (TYPE_IS_PADDING_P (gnu_scalar_type)) |
a1ab4c31 AC |
4959 | gnu_scalar_type = TREE_TYPE (TYPE_FIELDS (gnu_scalar_type)); |
4960 | ||
4961 | /* If this is a floating point type and we haven't set a floating | |
4962 | point type yet, use this in the evaluation of the bounds. */ | |
4963 | if (!longest_float_type_node && kind == E_Floating_Point_Type) | |
c1abd261 | 4964 | longest_float_type_node = gnu_scalar_type; |
a1ab4c31 | 4965 | |
84fb43a1 EB |
4966 | gnu_low_bound = gnat_to_gnu (Type_Low_Bound (gnat_entity)); |
4967 | gnu_high_bound = gnat_to_gnu (Type_High_Bound (gnat_entity)); | |
a1ab4c31 | 4968 | |
c1abd261 | 4969 | if (kind == E_Enumeration_Type) |
a1ab4c31 | 4970 | { |
84fb43a1 EB |
4971 | /* Enumeration types have specific RM bounds. */ |
4972 | SET_TYPE_RM_MIN_VALUE (gnu_scalar_type, gnu_low_bound); | |
4973 | SET_TYPE_RM_MAX_VALUE (gnu_scalar_type, gnu_high_bound); | |
4974 | ||
acccc61c | 4975 | /* Write full debugging information. */ |
a1ab4c31 AC |
4976 | rest_of_type_decl_compilation (gnu_decl); |
4977 | } | |
84fb43a1 EB |
4978 | |
4979 | else | |
4980 | { | |
4981 | /* Floating-point types don't have specific RM bounds. */ | |
4982 | TYPE_GCC_MIN_VALUE (gnu_scalar_type) = gnu_low_bound; | |
4983 | TYPE_GCC_MAX_VALUE (gnu_scalar_type) = gnu_high_bound; | |
4984 | } | |
a1ab4c31 AC |
4985 | } |
4986 | ||
4987 | /* If we deferred processing of incomplete types, re-enable it. If there | |
80ec8b4c EB |
4988 | were no other disables and we have deferred types to process, do so. */ |
4989 | if (this_deferred | |
4990 | && --defer_incomplete_level == 0 | |
4991 | && defer_incomplete_list) | |
a1ab4c31 | 4992 | { |
80ec8b4c | 4993 | struct incomplete *p, *next; |
a1ab4c31 | 4994 | |
80ec8b4c EB |
4995 | /* We are back to level 0 for the deferring of incomplete types. |
4996 | But processing these incomplete types below may itself require | |
4997 | deferring, so preserve what we have and restart from scratch. */ | |
4998 | p = defer_incomplete_list; | |
4999 | defer_incomplete_list = NULL; | |
a1ab4c31 | 5000 | |
80ec8b4c EB |
5001 | /* For finalization, however, all types must be complete so we |
5002 | cannot do the same because deferred incomplete types may end up | |
5003 | referencing each other. Process them all recursively first. */ | |
5004 | defer_finalize_level++; | |
a1ab4c31 | 5005 | |
80ec8b4c EB |
5006 | for (; p; p = next) |
5007 | { | |
5008 | next = p->next; | |
a1ab4c31 | 5009 | |
80ec8b4c EB |
5010 | if (p->old_type) |
5011 | update_pointer_to (TYPE_MAIN_VARIANT (p->old_type), | |
5012 | gnat_to_gnu_type (p->full_type)); | |
5013 | free (p); | |
a1ab4c31 AC |
5014 | } |
5015 | ||
80ec8b4c EB |
5016 | defer_finalize_level--; |
5017 | } | |
a1ab4c31 | 5018 | |
80ec8b4c EB |
5019 | /* If all the deferred incomplete types have been processed, we can proceed |
5020 | with the finalization of the deferred types. */ | |
5021 | if (defer_incomplete_level == 0 | |
5022 | && defer_finalize_level == 0 | |
5023 | && defer_finalize_list) | |
5024 | { | |
5025 | unsigned int i; | |
5026 | tree t; | |
a1ab4c31 | 5027 | |
80ec8b4c EB |
5028 | FOR_EACH_VEC_ELT (tree, defer_finalize_list, i, t) |
5029 | rest_of_type_decl_compilation_no_defer (t); | |
5030 | ||
5031 | VEC_free (tree, heap, defer_finalize_list); | |
a1ab4c31 AC |
5032 | } |
5033 | ||
6ddf9843 EB |
5034 | /* If we are not defining this type, see if it's on one of the lists of |
5035 | incomplete types. If so, handle the list entry now. */ | |
5036 | if (is_type && !definition) | |
a1ab4c31 | 5037 | { |
6ddf9843 | 5038 | struct incomplete *p; |
a1ab4c31 | 5039 | |
6ddf9843 EB |
5040 | for (p = defer_incomplete_list; p; p = p->next) |
5041 | if (p->old_type && p->full_type == gnat_entity) | |
a1ab4c31 | 5042 | { |
6ddf9843 | 5043 | update_pointer_to (TYPE_MAIN_VARIANT (p->old_type), |
a1ab4c31 | 5044 | TREE_TYPE (gnu_decl)); |
6ddf9843 EB |
5045 | p->old_type = NULL_TREE; |
5046 | } | |
5047 | ||
5048 | for (p = defer_limited_with; p; p = p->next) | |
5049 | if (p->old_type && Non_Limited_View (p->full_type) == gnat_entity) | |
5050 | { | |
5051 | update_pointer_to (TYPE_MAIN_VARIANT (p->old_type), | |
5052 | TREE_TYPE (gnu_decl)); | |
5053 | p->old_type = NULL_TREE; | |
a1ab4c31 AC |
5054 | } |
5055 | } | |
5056 | ||
5057 | if (this_global) | |
5058 | force_global--; | |
5059 | ||
b4680ca1 EB |
5060 | /* If this is a packed array type whose original array type is itself |
5061 | an Itype without freeze node, make sure the latter is processed. */ | |
a1ab4c31 | 5062 | if (Is_Packed_Array_Type (gnat_entity) |
b4680ca1 EB |
5063 | && Is_Itype (Original_Array_Type (gnat_entity)) |
5064 | && No (Freeze_Node (Original_Array_Type (gnat_entity))) | |
5065 | && !present_gnu_tree (Original_Array_Type (gnat_entity))) | |
5066 | gnat_to_gnu_entity (Original_Array_Type (gnat_entity), NULL_TREE, 0); | |
a1ab4c31 AC |
5067 | |
5068 | return gnu_decl; | |
5069 | } | |
5070 | ||
5071 | /* Similar, but if the returned value is a COMPONENT_REF, return the | |
5072 | FIELD_DECL. */ | |
5073 | ||
5074 | tree | |
5075 | gnat_to_gnu_field_decl (Entity_Id gnat_entity) | |
5076 | { | |
5077 | tree gnu_field = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0); | |
5078 | ||
5079 | if (TREE_CODE (gnu_field) == COMPONENT_REF) | |
5080 | gnu_field = TREE_OPERAND (gnu_field, 1); | |
5081 | ||
5082 | return gnu_field; | |
5083 | } | |
5084 | ||
229077b0 EB |
5085 | /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return |
5086 | the GCC type corresponding to that entity. */ | |
5087 | ||
5088 | tree | |
5089 | gnat_to_gnu_type (Entity_Id gnat_entity) | |
5090 | { | |
5091 | tree gnu_decl; | |
5092 | ||
5093 | /* The back end never attempts to annotate generic types. */ | |
5094 | if (Is_Generic_Type (gnat_entity) && type_annotate_only) | |
5095 | return void_type_node; | |
5096 | ||
5097 | gnu_decl = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0); | |
5098 | gcc_assert (TREE_CODE (gnu_decl) == TYPE_DECL); | |
5099 | ||
5100 | return TREE_TYPE (gnu_decl); | |
5101 | } | |
5102 | ||
5103 | /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return | |
5104 | the unpadded version of the GCC type corresponding to that entity. */ | |
5105 | ||
5106 | tree | |
5107 | get_unpadded_type (Entity_Id gnat_entity) | |
5108 | { | |
5109 | tree type = gnat_to_gnu_type (gnat_entity); | |
5110 | ||
315cff15 | 5111 | if (TYPE_IS_PADDING_P (type)) |
229077b0 EB |
5112 | type = TREE_TYPE (TYPE_FIELDS (type)); |
5113 | ||
5114 | return type; | |
5115 | } | |
5116 | \f | |
a1ab4c31 AC |
5117 | /* Wrap up compilation of DECL, a TYPE_DECL, possibly deferring it. |
5118 | Every TYPE_DECL generated for a type definition must be passed | |
5119 | to this function once everything else has been done for it. */ | |
5120 | ||
5121 | void | |
5122 | rest_of_type_decl_compilation (tree decl) | |
5123 | { | |
5124 | /* We need to defer finalizing the type if incomplete types | |
5125 | are being deferred or if they are being processed. */ | |
a10623fb | 5126 | if (defer_incomplete_level != 0 || defer_finalize_level != 0) |
a1ab4c31 AC |
5127 | VEC_safe_push (tree, heap, defer_finalize_list, decl); |
5128 | else | |
5129 | rest_of_type_decl_compilation_no_defer (decl); | |
5130 | } | |
5131 | ||
5132 | /* Same as above but without deferring the compilation. This | |
5133 | function should not be invoked directly on a TYPE_DECL. */ | |
5134 | ||
5135 | static void | |
5136 | rest_of_type_decl_compilation_no_defer (tree decl) | |
5137 | { | |
5138 | const int toplev = global_bindings_p (); | |
5139 | tree t = TREE_TYPE (decl); | |
5140 | ||
5141 | rest_of_decl_compilation (decl, toplev, 0); | |
5142 | ||
5143 | /* Now process all the variants. This is needed for STABS. */ | |
5144 | for (t = TYPE_MAIN_VARIANT (t); t; t = TYPE_NEXT_VARIANT (t)) | |
5145 | { | |
5146 | if (t == TREE_TYPE (decl)) | |
5147 | continue; | |
5148 | ||
5149 | if (!TYPE_STUB_DECL (t)) | |
10069d53 | 5150 | TYPE_STUB_DECL (t) = create_type_stub_decl (DECL_NAME (decl), t); |
a1ab4c31 AC |
5151 | |
5152 | rest_of_type_compilation (t, toplev); | |
5153 | } | |
5154 | } | |
5155 | ||
6ddf9843 | 5156 | /* Finalize the processing of From_With_Type incomplete types. */ |
a1ab4c31 AC |
5157 | |
5158 | void | |
5159 | finalize_from_with_types (void) | |
5160 | { | |
6ddf9843 EB |
5161 | struct incomplete *p, *next; |
5162 | ||
5163 | p = defer_limited_with; | |
5164 | defer_limited_with = NULL; | |
a1ab4c31 | 5165 | |
6ddf9843 | 5166 | for (; p; p = next) |
a1ab4c31 | 5167 | { |
6ddf9843 | 5168 | next = p->next; |
a1ab4c31 | 5169 | |
6ddf9843 EB |
5170 | if (p->old_type) |
5171 | update_pointer_to (TYPE_MAIN_VARIANT (p->old_type), | |
5172 | gnat_to_gnu_type (p->full_type)); | |
5173 | free (p); | |
a1ab4c31 AC |
5174 | } |
5175 | } | |
5176 | ||
5177 | /* Return the equivalent type to be used for GNAT_ENTITY, if it's a | |
5178 | kind of type (such E_Task_Type) that has a different type which Gigi | |
5179 | uses for its representation. If the type does not have a special type | |
5180 | for its representation, return GNAT_ENTITY. If a type is supposed to | |
5181 | exist, but does not, abort unless annotating types, in which case | |
5182 | return Empty. If GNAT_ENTITY is Empty, return Empty. */ | |
5183 | ||
5184 | Entity_Id | |
5185 | Gigi_Equivalent_Type (Entity_Id gnat_entity) | |
5186 | { | |
5187 | Entity_Id gnat_equiv = gnat_entity; | |
5188 | ||
5189 | if (No (gnat_entity)) | |
5190 | return gnat_entity; | |
5191 | ||
5192 | switch (Ekind (gnat_entity)) | |
5193 | { | |
5194 | case E_Class_Wide_Subtype: | |
5195 | if (Present (Equivalent_Type (gnat_entity))) | |
5196 | gnat_equiv = Equivalent_Type (gnat_entity); | |
5197 | break; | |
5198 | ||
5199 | case E_Access_Protected_Subprogram_Type: | |
5200 | case E_Anonymous_Access_Protected_Subprogram_Type: | |
5201 | gnat_equiv = Equivalent_Type (gnat_entity); | |
5202 | break; | |
5203 | ||
5204 | case E_Class_Wide_Type: | |
cbae498b | 5205 | gnat_equiv = Root_Type (gnat_entity); |
a1ab4c31 AC |
5206 | break; |
5207 | ||
5208 | case E_Task_Type: | |
5209 | case E_Task_Subtype: | |
5210 | case E_Protected_Type: | |
5211 | case E_Protected_Subtype: | |
5212 | gnat_equiv = Corresponding_Record_Type (gnat_entity); | |
5213 | break; | |
5214 | ||
5215 | default: | |
5216 | break; | |
5217 | } | |
5218 | ||
5219 | gcc_assert (Present (gnat_equiv) || type_annotate_only); | |
5220 | return gnat_equiv; | |
5221 | } | |
5222 | ||
2cac6017 EB |
5223 | /* Return a GCC tree for a type corresponding to the component type of the |
5224 | array type or subtype GNAT_ARRAY. DEFINITION is true if this component | |
5225 | is for an array being defined. DEBUG_INFO_P is true if we need to write | |
5226 | debug information for other types that we may create in the process. */ | |
5227 | ||
5228 | static tree | |
5229 | gnat_to_gnu_component_type (Entity_Id gnat_array, bool definition, | |
5230 | bool debug_info_p) | |
5231 | { | |
5232 | tree gnu_type = gnat_to_gnu_type (Component_Type (gnat_array)); | |
5233 | tree gnu_comp_size; | |
5234 | ||
5235 | /* Try to get a smaller form of the component if needed. */ | |
5236 | if ((Is_Packed (gnat_array) | |
5237 | || Has_Component_Size_Clause (gnat_array)) | |
5238 | && !Is_Bit_Packed_Array (gnat_array) | |
5239 | && !Has_Aliased_Components (gnat_array) | |
5240 | && !Strict_Alignment (Component_Type (gnat_array)) | |
5241 | && TREE_CODE (gnu_type) == RECORD_TYPE | |
315cff15 | 5242 | && !TYPE_FAT_POINTER_P (gnu_type) |
2cac6017 EB |
5243 | && host_integerp (TYPE_SIZE (gnu_type), 1)) |
5244 | gnu_type = make_packable_type (gnu_type, false); | |
5245 | ||
5246 | if (Has_Atomic_Components (gnat_array)) | |
5247 | check_ok_for_atomic (gnu_type, gnat_array, true); | |
5248 | ||
5249 | /* Get and validate any specified Component_Size. */ | |
5250 | gnu_comp_size | |
5251 | = validate_size (Component_Size (gnat_array), gnu_type, gnat_array, | |
5252 | Is_Bit_Packed_Array (gnat_array) ? TYPE_DECL : VAR_DECL, | |
5253 | true, Has_Component_Size_Clause (gnat_array)); | |
5254 | ||
1aa8b1dd EB |
5255 | /* If the array has aliased components and the component size can be zero, |
5256 | force at least unit size to ensure that the components have distinct | |
5257 | addresses. */ | |
5258 | if (!gnu_comp_size | |
5259 | && Has_Aliased_Components (gnat_array) | |
5260 | && (integer_zerop (TYPE_SIZE (gnu_type)) | |
5261 | || (TREE_CODE (gnu_type) == ARRAY_TYPE | |
5262 | && !TREE_CONSTANT (TYPE_SIZE (gnu_type))))) | |
5263 | gnu_comp_size | |
5264 | = size_binop (MAX_EXPR, TYPE_SIZE (gnu_type), bitsize_unit_node); | |
5265 | ||
2cac6017 EB |
5266 | /* If the component type is a RECORD_TYPE that has a self-referential size, |
5267 | then use the maximum size for the component size. */ | |
5268 | if (!gnu_comp_size | |
5269 | && TREE_CODE (gnu_type) == RECORD_TYPE | |
5270 | && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))) | |
5271 | gnu_comp_size = max_size (TYPE_SIZE (gnu_type), true); | |
5272 | ||
5273 | /* Honor the component size. This is not needed for bit-packed arrays. */ | |
5274 | if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_array)) | |
5275 | { | |
5276 | tree orig_type = gnu_type; | |
5277 | unsigned int max_align; | |
5278 | ||
5279 | /* If an alignment is specified, use it as a cap on the component type | |
5280 | so that it can be honored for the whole type. But ignore it for the | |
5281 | original type of packed array types. */ | |
5282 | if (No (Packed_Array_Type (gnat_array)) && Known_Alignment (gnat_array)) | |
5283 | max_align = validate_alignment (Alignment (gnat_array), gnat_array, 0); | |
5284 | else | |
5285 | max_align = 0; | |
5286 | ||
5287 | gnu_type = make_type_from_size (gnu_type, gnu_comp_size, false); | |
5288 | if (max_align > 0 && TYPE_ALIGN (gnu_type) > max_align) | |
5289 | gnu_type = orig_type; | |
5290 | else | |
5291 | orig_type = gnu_type; | |
5292 | ||
5293 | gnu_type = maybe_pad_type (gnu_type, gnu_comp_size, 0, gnat_array, | |
afb4afcd | 5294 | true, false, definition, true); |
2cac6017 EB |
5295 | |
5296 | /* If a padding record was made, declare it now since it will never be | |
5297 | declared otherwise. This is necessary to ensure that its subtrees | |
5298 | are properly marked. */ | |
5299 | if (gnu_type != orig_type && !DECL_P (TYPE_NAME (gnu_type))) | |
5300 | create_type_decl (TYPE_NAME (gnu_type), gnu_type, NULL, true, | |
5301 | debug_info_p, gnat_array); | |
5302 | } | |
5303 | ||
5304 | if (Has_Volatile_Components (Base_Type (gnat_array))) | |
5305 | gnu_type | |
5306 | = build_qualified_type (gnu_type, | |
5307 | TYPE_QUALS (gnu_type) | TYPE_QUAL_VOLATILE); | |
5308 | ||
5309 | return gnu_type; | |
5310 | } | |
5311 | ||
a1ab4c31 AC |
5312 | /* Return a GCC tree for a parameter corresponding to GNAT_PARAM and |
5313 | using MECH as its passing mechanism, to be placed in the parameter | |
5314 | list built for GNAT_SUBPROG. Assume a foreign convention for the | |
5315 | latter if FOREIGN is true. Also set CICO to true if the parameter | |
5316 | must use the copy-in copy-out implementation mechanism. | |
5317 | ||
5318 | The returned tree is a PARM_DECL, except for those cases where no | |
5319 | parameter needs to be actually passed to the subprogram; the type | |
5320 | of this "shadow" parameter is then returned instead. */ | |
5321 | ||
5322 | static tree | |
5323 | gnat_to_gnu_param (Entity_Id gnat_param, Mechanism_Type mech, | |
5324 | Entity_Id gnat_subprog, bool foreign, bool *cico) | |
5325 | { | |
5326 | tree gnu_param_name = get_entity_name (gnat_param); | |
5327 | tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param)); | |
6ca2b0a0 | 5328 | tree gnu_param_type_alt = NULL_TREE; |
a1ab4c31 AC |
5329 | bool in_param = (Ekind (gnat_param) == E_In_Parameter); |
5330 | /* The parameter can be indirectly modified if its address is taken. */ | |
5331 | bool ro_param = in_param && !Address_Taken (gnat_param); | |
0c700259 EB |
5332 | bool by_return = false, by_component_ptr = false; |
5333 | bool by_ref = false, by_double_ref = false; | |
a1ab4c31 AC |
5334 | tree gnu_param; |
5335 | ||
5336 | /* Copy-return is used only for the first parameter of a valued procedure. | |
5337 | It's a copy mechanism for which a parameter is never allocated. */ | |
5338 | if (mech == By_Copy_Return) | |
5339 | { | |
5340 | gcc_assert (Ekind (gnat_param) == E_Out_Parameter); | |
5341 | mech = By_Copy; | |
5342 | by_return = true; | |
5343 | } | |
5344 | ||
5345 | /* If this is either a foreign function or if the underlying type won't | |
5346 | be passed by reference, strip off possible padding type. */ | |
315cff15 | 5347 | if (TYPE_IS_PADDING_P (gnu_param_type)) |
a1ab4c31 AC |
5348 | { |
5349 | tree unpadded_type = TREE_TYPE (TYPE_FIELDS (gnu_param_type)); | |
5350 | ||
5351 | if (mech == By_Reference | |
5352 | || foreign | |
5353 | || (!must_pass_by_ref (unpadded_type) | |
5354 | && (mech == By_Copy || !default_pass_by_ref (unpadded_type)))) | |
5355 | gnu_param_type = unpadded_type; | |
5356 | } | |
5357 | ||
5358 | /* If this is a read-only parameter, make a variant of the type that is | |
5359 | read-only. ??? However, if this is an unconstrained array, that type | |
5360 | can be very complex, so skip it for now. Likewise for any other | |
5361 | self-referential type. */ | |
5362 | if (ro_param | |
5363 | && TREE_CODE (gnu_param_type) != UNCONSTRAINED_ARRAY_TYPE | |
5364 | && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_param_type))) | |
5365 | gnu_param_type = build_qualified_type (gnu_param_type, | |
5366 | (TYPE_QUALS (gnu_param_type) | |
5367 | | TYPE_QUAL_CONST)); | |
5368 | ||
5369 | /* For foreign conventions, pass arrays as pointers to the element type. | |
5370 | First check for unconstrained array and get the underlying array. */ | |
5371 | if (foreign && TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE) | |
5372 | gnu_param_type | |
5373 | = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_param_type)))); | |
5374 | ||
2503cb81 OH |
5375 | /* For GCC builtins, pass Address integer types as (void *) */ |
5376 | if (Convention (gnat_subprog) == Convention_Intrinsic | |
5377 | && Present (Interface_Name (gnat_subprog)) | |
5378 | && Is_Descendent_Of_Address (Etype (gnat_param))) | |
5379 | gnu_param_type = ptr_void_type_node; | |
5380 | ||
a981c964 | 5381 | /* VMS descriptors are themselves passed by reference. */ |
f0a631aa DR |
5382 | if (mech == By_Short_Descriptor || |
5383 | (mech == By_Descriptor && TARGET_ABI_OPEN_VMS && !TARGET_MALLOC64)) | |
5384 | gnu_param_type | |
5385 | = build_pointer_type (build_vms_descriptor32 (gnu_param_type, | |
5386 | Mechanism (gnat_param), | |
5387 | gnat_subprog)); | |
5388 | else if (mech == By_Descriptor) | |
6ca2b0a0 | 5389 | { |
a981c964 EB |
5390 | /* Build both a 32-bit and 64-bit descriptor, one of which will be |
5391 | chosen in fill_vms_descriptor. */ | |
6ca2b0a0 | 5392 | gnu_param_type_alt |
d628c015 | 5393 | = build_pointer_type (build_vms_descriptor32 (gnu_param_type, |
6ca2b0a0 DR |
5394 | Mechanism (gnat_param), |
5395 | gnat_subprog)); | |
5396 | gnu_param_type | |
5397 | = build_pointer_type (build_vms_descriptor (gnu_param_type, | |
5398 | Mechanism (gnat_param), | |
5399 | gnat_subprog)); | |
5400 | } | |
a1ab4c31 AC |
5401 | |
5402 | /* Arrays are passed as pointers to element type for foreign conventions. */ | |
5403 | else if (foreign | |
5404 | && mech != By_Copy | |
5405 | && TREE_CODE (gnu_param_type) == ARRAY_TYPE) | |
5406 | { | |
5407 | /* Strip off any multi-dimensional entries, then strip | |
5408 | off the last array to get the component type. */ | |
5409 | while (TREE_CODE (TREE_TYPE (gnu_param_type)) == ARRAY_TYPE | |
5410 | && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_param_type))) | |
5411 | gnu_param_type = TREE_TYPE (gnu_param_type); | |
5412 | ||
5413 | by_component_ptr = true; | |
5414 | gnu_param_type = TREE_TYPE (gnu_param_type); | |
5415 | ||
5416 | if (ro_param) | |
5417 | gnu_param_type = build_qualified_type (gnu_param_type, | |
5418 | (TYPE_QUALS (gnu_param_type) | |
5419 | | TYPE_QUAL_CONST)); | |
5420 | ||
5421 | gnu_param_type = build_pointer_type (gnu_param_type); | |
5422 | } | |
5423 | ||
5424 | /* Fat pointers are passed as thin pointers for foreign conventions. */ | |
315cff15 | 5425 | else if (foreign && TYPE_IS_FAT_POINTER_P (gnu_param_type)) |
a1ab4c31 AC |
5426 | gnu_param_type |
5427 | = make_type_from_size (gnu_param_type, size_int (POINTER_SIZE), 0); | |
5428 | ||
5429 | /* If we must pass or were requested to pass by reference, do so. | |
5430 | If we were requested to pass by copy, do so. | |
5431 | Otherwise, for foreign conventions, pass In Out or Out parameters | |
5432 | or aggregates by reference. For COBOL and Fortran, pass all | |
5433 | integer and FP types that way too. For Convention Ada, use | |
5434 | the standard Ada default. */ | |
5435 | else if (must_pass_by_ref (gnu_param_type) | |
5436 | || mech == By_Reference | |
5437 | || (mech != By_Copy | |
5438 | && ((foreign | |
5439 | && (!in_param || AGGREGATE_TYPE_P (gnu_param_type))) | |
5440 | || (foreign | |
5441 | && (Convention (gnat_subprog) == Convention_Fortran | |
5442 | || Convention (gnat_subprog) == Convention_COBOL) | |
5443 | && (INTEGRAL_TYPE_P (gnu_param_type) | |
5444 | || FLOAT_TYPE_P (gnu_param_type))) | |
5445 | || (!foreign | |
5446 | && default_pass_by_ref (gnu_param_type))))) | |
5447 | { | |
5448 | gnu_param_type = build_reference_type (gnu_param_type); | |
5449 | by_ref = true; | |
0c700259 EB |
5450 | |
5451 | /* In some ABIs, e.g. SPARC 32-bit, fat pointer types are themselves | |
5452 | passed by reference. Pass them by explicit reference, this will | |
5453 | generate more debuggable code at -O0. */ | |
5454 | if (TYPE_IS_FAT_POINTER_P (gnu_param_type) | |
d5cc9181 | 5455 | && targetm.calls.pass_by_reference (pack_cumulative_args (NULL), |
0c700259 EB |
5456 | TYPE_MODE (gnu_param_type), |
5457 | gnu_param_type, | |
5458 | true)) | |
5459 | { | |
5460 | gnu_param_type = build_reference_type (gnu_param_type); | |
5461 | by_double_ref = true; | |
5462 | } | |
a1ab4c31 AC |
5463 | } |
5464 | ||
5465 | /* Pass In Out or Out parameters using copy-in copy-out mechanism. */ | |
5466 | else if (!in_param) | |
5467 | *cico = true; | |
5468 | ||
5469 | if (mech == By_Copy && (by_ref || by_component_ptr)) | |
5470 | post_error ("?cannot pass & by copy", gnat_param); | |
5471 | ||
5472 | /* If this is an Out parameter that isn't passed by reference and isn't | |
5473 | a pointer or aggregate, we don't make a PARM_DECL for it. Instead, | |
5474 | it will be a VAR_DECL created when we process the procedure, so just | |
5475 | return its type. For the special parameter of a valued procedure, | |
5476 | never pass it in. | |
5477 | ||
5478 | An exception is made to cover the RM-6.4.1 rule requiring "by copy" | |
5479 | Out parameters with discriminants or implicit initial values to be | |
5480 | handled like In Out parameters. These type are normally built as | |
5481 | aggregates, hence passed by reference, except for some packed arrays | |
5482 | which end up encoded in special integer types. | |
5483 | ||
5484 | The exception we need to make is then for packed arrays of records | |
5485 | with discriminants or implicit initial values. We have no light/easy | |
5486 | way to check for the latter case, so we merely check for packed arrays | |
5487 | of records. This may lead to useless copy-in operations, but in very | |
5488 | rare cases only, as these would be exceptions in a set of already | |
5489 | exceptional situations. */ | |
5490 | if (Ekind (gnat_param) == E_Out_Parameter | |
5491 | && !by_ref | |
5492 | && (by_return | |
5493 | || (mech != By_Descriptor | |
d628c015 | 5494 | && mech != By_Short_Descriptor |
a1ab4c31 AC |
5495 | && !POINTER_TYPE_P (gnu_param_type) |
5496 | && !AGGREGATE_TYPE_P (gnu_param_type))) | |
5497 | && !(Is_Array_Type (Etype (gnat_param)) | |
5498 | && Is_Packed (Etype (gnat_param)) | |
5499 | && Is_Composite_Type (Component_Type (Etype (gnat_param))))) | |
5500 | return gnu_param_type; | |
5501 | ||
5502 | gnu_param = create_param_decl (gnu_param_name, gnu_param_type, | |
5503 | ro_param || by_ref || by_component_ptr); | |
5504 | DECL_BY_REF_P (gnu_param) = by_ref; | |
0c700259 | 5505 | DECL_BY_DOUBLE_REF_P (gnu_param) = by_double_ref; |
a1ab4c31 | 5506 | DECL_BY_COMPONENT_PTR_P (gnu_param) = by_component_ptr; |
d628c015 DR |
5507 | DECL_BY_DESCRIPTOR_P (gnu_param) = (mech == By_Descriptor || |
5508 | mech == By_Short_Descriptor); | |
a1ab4c31 AC |
5509 | DECL_POINTS_TO_READONLY_P (gnu_param) |
5510 | = (ro_param && (by_ref || by_component_ptr)); | |
5511 | ||
a981c964 EB |
5512 | /* Save the alternate descriptor type, if any. */ |
5513 | if (gnu_param_type_alt) | |
5514 | SET_DECL_PARM_ALT_TYPE (gnu_param, gnu_param_type_alt); | |
6ca2b0a0 | 5515 | |
a1ab4c31 AC |
5516 | /* If no Mechanism was specified, indicate what we're using, then |
5517 | back-annotate it. */ | |
5518 | if (mech == Default) | |
5519 | mech = (by_ref || by_component_ptr) ? By_Reference : By_Copy; | |
5520 | ||
5521 | Set_Mechanism (gnat_param, mech); | |
5522 | return gnu_param; | |
5523 | } | |
5524 | ||
5525 | /* Return true if DISCR1 and DISCR2 represent the same discriminant. */ | |
5526 | ||
5527 | static bool | |
5528 | same_discriminant_p (Entity_Id discr1, Entity_Id discr2) | |
5529 | { | |
5530 | while (Present (Corresponding_Discriminant (discr1))) | |
5531 | discr1 = Corresponding_Discriminant (discr1); | |
5532 | ||
5533 | while (Present (Corresponding_Discriminant (discr2))) | |
5534 | discr2 = Corresponding_Discriminant (discr2); | |
5535 | ||
5536 | return | |
5537 | Original_Record_Component (discr1) == Original_Record_Component (discr2); | |
5538 | } | |
5539 | ||
d8e94f79 EB |
5540 | /* Return true if the array type GNU_TYPE, which represents a dimension of |
5541 | GNAT_TYPE, has a non-aliased component in the back-end sense. */ | |
a1ab4c31 AC |
5542 | |
5543 | static bool | |
d8e94f79 | 5544 | array_type_has_nonaliased_component (tree gnu_type, Entity_Id gnat_type) |
a1ab4c31 | 5545 | { |
d8e94f79 EB |
5546 | /* If the array type is not the innermost dimension of the GNAT type, |
5547 | then it has a non-aliased component. */ | |
a1ab4c31 AC |
5548 | if (TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE |
5549 | && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type))) | |
5550 | return true; | |
5551 | ||
d8e94f79 EB |
5552 | /* If the array type has an aliased component in the front-end sense, |
5553 | then it also has an aliased component in the back-end sense. */ | |
a1ab4c31 AC |
5554 | if (Has_Aliased_Components (gnat_type)) |
5555 | return false; | |
5556 | ||
d8e94f79 EB |
5557 | /* If this is a derived type, then it has a non-aliased component if |
5558 | and only if its parent type also has one. */ | |
5559 | if (Is_Derived_Type (gnat_type)) | |
5560 | { | |
5561 | tree gnu_parent_type = gnat_to_gnu_type (Etype (gnat_type)); | |
5562 | int index; | |
5563 | if (TREE_CODE (gnu_parent_type) == UNCONSTRAINED_ARRAY_TYPE) | |
5564 | gnu_parent_type | |
5565 | = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_parent_type)))); | |
5566 | for (index = Number_Dimensions (gnat_type) - 1; index > 0; index--) | |
5567 | gnu_parent_type = TREE_TYPE (gnu_parent_type); | |
5568 | return TYPE_NONALIASED_COMPONENT (gnu_parent_type); | |
5569 | } | |
5570 | ||
5571 | /* Otherwise, rely exclusively on properties of the element type. */ | |
a1ab4c31 AC |
5572 | return type_for_nonaliased_component_p (TREE_TYPE (gnu_type)); |
5573 | } | |
229077b0 EB |
5574 | |
5575 | /* Return true if GNAT_ADDRESS is a value known at compile-time. */ | |
5576 | ||
5577 | static bool | |
5578 | compile_time_known_address_p (Node_Id gnat_address) | |
5579 | { | |
5580 | /* Catch System'To_Address. */ | |
5581 | if (Nkind (gnat_address) == N_Unchecked_Type_Conversion) | |
5582 | gnat_address = Expression (gnat_address); | |
5583 | ||
5584 | return Compile_Time_Known_Value (gnat_address); | |
5585 | } | |
f45f9664 | 5586 | |
58c8f770 EB |
5587 | /* Return true if GNAT_RANGE, a N_Range node, cannot be superflat, i.e. if the |
5588 | inequality HB >= LB-1 is true. LB and HB are the low and high bounds. */ | |
f45f9664 EB |
5589 | |
5590 | static bool | |
5591 | cannot_be_superflat_p (Node_Id gnat_range) | |
5592 | { | |
5593 | Node_Id gnat_lb = Low_Bound (gnat_range), gnat_hb = High_Bound (gnat_range); | |
683ebd75 | 5594 | Node_Id scalar_range; |
1081f5a7 | 5595 | tree gnu_lb, gnu_hb, gnu_lb_minus_one; |
f45f9664 EB |
5596 | |
5597 | /* If the low bound is not constant, try to find an upper bound. */ | |
5598 | while (Nkind (gnat_lb) != N_Integer_Literal | |
5599 | && (Ekind (Etype (gnat_lb)) == E_Signed_Integer_Subtype | |
5600 | || Ekind (Etype (gnat_lb)) == E_Modular_Integer_Subtype) | |
683ebd75 OH |
5601 | && (scalar_range = Scalar_Range (Etype (gnat_lb))) |
5602 | && (Nkind (scalar_range) == N_Signed_Integer_Type_Definition | |
5603 | || Nkind (scalar_range) == N_Range)) | |
5604 | gnat_lb = High_Bound (scalar_range); | |
f45f9664 EB |
5605 | |
5606 | /* If the high bound is not constant, try to find a lower bound. */ | |
5607 | while (Nkind (gnat_hb) != N_Integer_Literal | |
5608 | && (Ekind (Etype (gnat_hb)) == E_Signed_Integer_Subtype | |
5609 | || Ekind (Etype (gnat_hb)) == E_Modular_Integer_Subtype) | |
683ebd75 OH |
5610 | && (scalar_range = Scalar_Range (Etype (gnat_hb))) |
5611 | && (Nkind (scalar_range) == N_Signed_Integer_Type_Definition | |
5612 | || Nkind (scalar_range) == N_Range)) | |
5613 | gnat_hb = Low_Bound (scalar_range); | |
f45f9664 | 5614 | |
1081f5a7 EB |
5615 | /* If we have failed to find constant bounds, punt. */ |
5616 | if (Nkind (gnat_lb) != N_Integer_Literal | |
5617 | || Nkind (gnat_hb) != N_Integer_Literal) | |
f45f9664 EB |
5618 | return false; |
5619 | ||
1081f5a7 EB |
5620 | /* We need at least a signed 64-bit type to catch most cases. */ |
5621 | gnu_lb = UI_To_gnu (Intval (gnat_lb), sbitsizetype); | |
5622 | gnu_hb = UI_To_gnu (Intval (gnat_hb), sbitsizetype); | |
5623 | if (TREE_OVERFLOW (gnu_lb) || TREE_OVERFLOW (gnu_hb)) | |
5624 | return false; | |
f45f9664 EB |
5625 | |
5626 | /* If the low bound is the smallest integer, nothing can be smaller. */ | |
1081f5a7 EB |
5627 | gnu_lb_minus_one = size_binop (MINUS_EXPR, gnu_lb, sbitsize_one_node); |
5628 | if (TREE_OVERFLOW (gnu_lb_minus_one)) | |
f45f9664 EB |
5629 | return true; |
5630 | ||
1081f5a7 | 5631 | return !tree_int_cst_lt (gnu_hb, gnu_lb_minus_one); |
f45f9664 | 5632 | } |
cb3d597d EB |
5633 | |
5634 | /* Return true if GNU_EXPR is (essentially) the address of a CONSTRUCTOR. */ | |
5635 | ||
5636 | static bool | |
5637 | constructor_address_p (tree gnu_expr) | |
5638 | { | |
5639 | while (TREE_CODE (gnu_expr) == NOP_EXPR | |
5640 | || TREE_CODE (gnu_expr) == CONVERT_EXPR | |
5641 | || TREE_CODE (gnu_expr) == NON_LVALUE_EXPR) | |
5642 | gnu_expr = TREE_OPERAND (gnu_expr, 0); | |
5643 | ||
5644 | return (TREE_CODE (gnu_expr) == ADDR_EXPR | |
5645 | && TREE_CODE (TREE_OPERAND (gnu_expr, 0)) == CONSTRUCTOR); | |
5646 | } | |
a1ab4c31 AC |
5647 | \f |
5648 | /* Given GNAT_ENTITY, elaborate all expressions that are required to | |
5649 | be elaborated at the point of its definition, but do nothing else. */ | |
5650 | ||
5651 | void | |
5652 | elaborate_entity (Entity_Id gnat_entity) | |
5653 | { | |
5654 | switch (Ekind (gnat_entity)) | |
5655 | { | |
5656 | case E_Signed_Integer_Subtype: | |
5657 | case E_Modular_Integer_Subtype: | |
5658 | case E_Enumeration_Subtype: | |
5659 | case E_Ordinary_Fixed_Point_Subtype: | |
5660 | case E_Decimal_Fixed_Point_Subtype: | |
5661 | case E_Floating_Point_Subtype: | |
5662 | { | |
5663 | Node_Id gnat_lb = Type_Low_Bound (gnat_entity); | |
5664 | Node_Id gnat_hb = Type_High_Bound (gnat_entity); | |
5665 | ||
c1abd261 EB |
5666 | /* ??? Tests to avoid Constraint_Error in static expressions |
5667 | are needed until after the front stops generating bogus | |
5668 | conversions on bounds of real types. */ | |
a1ab4c31 AC |
5669 | if (!Raises_Constraint_Error (gnat_lb)) |
5670 | elaborate_expression (gnat_lb, gnat_entity, get_identifier ("L"), | |
a531043b | 5671 | true, false, Needs_Debug_Info (gnat_entity)); |
a1ab4c31 AC |
5672 | if (!Raises_Constraint_Error (gnat_hb)) |
5673 | elaborate_expression (gnat_hb, gnat_entity, get_identifier ("U"), | |
a531043b | 5674 | true, false, Needs_Debug_Info (gnat_entity)); |
a1ab4c31 AC |
5675 | break; |
5676 | } | |
5677 | ||
5678 | case E_Record_Type: | |
5679 | { | |
5680 | Node_Id full_definition = Declaration_Node (gnat_entity); | |
5681 | Node_Id record_definition = Type_Definition (full_definition); | |
5682 | ||
5683 | /* If this is a record extension, go a level further to find the | |
5684 | record definition. */ | |
5685 | if (Nkind (record_definition) == N_Derived_Type_Definition) | |
5686 | record_definition = Record_Extension_Part (record_definition); | |
5687 | } | |
5688 | break; | |
5689 | ||
5690 | case E_Record_Subtype: | |
5691 | case E_Private_Subtype: | |
5692 | case E_Limited_Private_Subtype: | |
5693 | case E_Record_Subtype_With_Private: | |
5694 | if (Is_Constrained (gnat_entity) | |
8cd28148 | 5695 | && Has_Discriminants (gnat_entity) |
a1ab4c31 AC |
5696 | && Present (Discriminant_Constraint (gnat_entity))) |
5697 | { | |
5698 | Node_Id gnat_discriminant_expr; | |
5699 | Entity_Id gnat_field; | |
5700 | ||
8cd28148 EB |
5701 | for (gnat_field |
5702 | = First_Discriminant (Implementation_Base_Type (gnat_entity)), | |
a1ab4c31 AC |
5703 | gnat_discriminant_expr |
5704 | = First_Elmt (Discriminant_Constraint (gnat_entity)); | |
5705 | Present (gnat_field); | |
5706 | gnat_field = Next_Discriminant (gnat_field), | |
5707 | gnat_discriminant_expr = Next_Elmt (gnat_discriminant_expr)) | |
5708 | /* ??? For now, ignore access discriminants. */ | |
5709 | if (!Is_Access_Type (Etype (Node (gnat_discriminant_expr)))) | |
5710 | elaborate_expression (Node (gnat_discriminant_expr), | |
a531043b EB |
5711 | gnat_entity, get_entity_name (gnat_field), |
5712 | true, false, false); | |
a1ab4c31 AC |
5713 | } |
5714 | break; | |
5715 | ||
5716 | } | |
5717 | } | |
5718 | \f | |
5719 | /* Mark GNAT_ENTITY as going out of scope at this point. Recursively mark | |
5720 | any entities on its entity chain similarly. */ | |
5721 | ||
5722 | void | |
5723 | mark_out_of_scope (Entity_Id gnat_entity) | |
5724 | { | |
5725 | Entity_Id gnat_sub_entity; | |
5726 | unsigned int kind = Ekind (gnat_entity); | |
5727 | ||
5728 | /* If this has an entity list, process all in the list. */ | |
5729 | if (IN (kind, Class_Wide_Kind) || IN (kind, Concurrent_Kind) | |
5730 | || IN (kind, Private_Kind) | |
5731 | || kind == E_Block || kind == E_Entry || kind == E_Entry_Family | |
5732 | || kind == E_Function || kind == E_Generic_Function | |
5733 | || kind == E_Generic_Package || kind == E_Generic_Procedure | |
5734 | || kind == E_Loop || kind == E_Operator || kind == E_Package | |
5735 | || kind == E_Package_Body || kind == E_Procedure | |
5736 | || kind == E_Record_Type || kind == E_Record_Subtype | |
5737 | || kind == E_Subprogram_Body || kind == E_Subprogram_Type) | |
5738 | for (gnat_sub_entity = First_Entity (gnat_entity); | |
5739 | Present (gnat_sub_entity); | |
5740 | gnat_sub_entity = Next_Entity (gnat_sub_entity)) | |
5741 | if (Scope (gnat_sub_entity) == gnat_entity | |
5742 | && gnat_sub_entity != gnat_entity) | |
5743 | mark_out_of_scope (gnat_sub_entity); | |
5744 | ||
5745 | /* Now clear this if it has been defined, but only do so if it isn't | |
5746 | a subprogram or parameter. We could refine this, but it isn't | |
5747 | worth it. If this is statically allocated, it is supposed to | |
5748 | hang around out of cope. */ | |
5749 | if (present_gnu_tree (gnat_entity) && !Is_Statically_Allocated (gnat_entity) | |
5750 | && kind != E_Procedure && kind != E_Function && !IN (kind, Formal_Kind)) | |
5751 | { | |
5752 | save_gnu_tree (gnat_entity, NULL_TREE, true); | |
5753 | save_gnu_tree (gnat_entity, error_mark_node, true); | |
5754 | } | |
5755 | } | |
5756 | \f | |
794511d2 EB |
5757 | /* Relate the alias sets of GNU_NEW_TYPE and GNU_OLD_TYPE according to OP. |
5758 | If this is a multi-dimensional array type, do this recursively. | |
5759 | ||
5760 | OP may be | |
5761 | - ALIAS_SET_COPY: the new set is made a copy of the old one. | |
5762 | - ALIAS_SET_SUPERSET: the new set is made a superset of the old one. | |
5763 | - ALIAS_SET_SUBSET: the new set is made a subset of the old one. */ | |
a1ab4c31 AC |
5764 | |
5765 | static void | |
794511d2 | 5766 | relate_alias_sets (tree gnu_new_type, tree gnu_old_type, enum alias_set_op op) |
a1ab4c31 AC |
5767 | { |
5768 | /* Remove any padding from GNU_OLD_TYPE. It doesn't matter in the case | |
5769 | of a one-dimensional array, since the padding has the same alias set | |
5770 | as the field type, but if it's a multi-dimensional array, we need to | |
5771 | see the inner types. */ | |
5772 | while (TREE_CODE (gnu_old_type) == RECORD_TYPE | |
5773 | && (TYPE_JUSTIFIED_MODULAR_P (gnu_old_type) | |
315cff15 | 5774 | || TYPE_PADDING_P (gnu_old_type))) |
a1ab4c31 AC |
5775 | gnu_old_type = TREE_TYPE (TYPE_FIELDS (gnu_old_type)); |
5776 | ||
794511d2 EB |
5777 | /* Unconstrained array types are deemed incomplete and would thus be given |
5778 | alias set 0. Retrieve the underlying array type. */ | |
a1ab4c31 AC |
5779 | if (TREE_CODE (gnu_old_type) == UNCONSTRAINED_ARRAY_TYPE) |
5780 | gnu_old_type | |
5781 | = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_old_type)))); | |
794511d2 EB |
5782 | if (TREE_CODE (gnu_new_type) == UNCONSTRAINED_ARRAY_TYPE) |
5783 | gnu_new_type | |
5784 | = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_new_type)))); | |
a1ab4c31 AC |
5785 | |
5786 | if (TREE_CODE (gnu_new_type) == ARRAY_TYPE | |
5787 | && TREE_CODE (TREE_TYPE (gnu_new_type)) == ARRAY_TYPE | |
5788 | && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_new_type))) | |
794511d2 | 5789 | relate_alias_sets (TREE_TYPE (gnu_new_type), TREE_TYPE (gnu_old_type), op); |
a1ab4c31 | 5790 | |
794511d2 EB |
5791 | switch (op) |
5792 | { | |
5793 | case ALIAS_SET_COPY: | |
5794 | /* The alias set shouldn't be copied between array types with different | |
5795 | aliasing settings because this can break the aliasing relationship | |
5796 | between the array type and its element type. */ | |
c3734896 | 5797 | #ifndef ENABLE_CHECKING |
794511d2 | 5798 | if (flag_strict_aliasing) |
c3734896 | 5799 | #endif |
794511d2 EB |
5800 | gcc_assert (!(TREE_CODE (gnu_new_type) == ARRAY_TYPE |
5801 | && TREE_CODE (gnu_old_type) == ARRAY_TYPE | |
5802 | && TYPE_NONALIASED_COMPONENT (gnu_new_type) | |
5803 | != TYPE_NONALIASED_COMPONENT (gnu_old_type))); | |
5804 | ||
5805 | TYPE_ALIAS_SET (gnu_new_type) = get_alias_set (gnu_old_type); | |
5806 | break; | |
5807 | ||
5808 | case ALIAS_SET_SUBSET: | |
5809 | case ALIAS_SET_SUPERSET: | |
5810 | { | |
5811 | alias_set_type old_set = get_alias_set (gnu_old_type); | |
5812 | alias_set_type new_set = get_alias_set (gnu_new_type); | |
5813 | ||
5814 | /* Do nothing if the alias sets conflict. This ensures that we | |
5815 | never call record_alias_subset several times for the same pair | |
5816 | or at all for alias set 0. */ | |
5817 | if (!alias_sets_conflict_p (old_set, new_set)) | |
5818 | { | |
5819 | if (op == ALIAS_SET_SUBSET) | |
5820 | record_alias_subset (old_set, new_set); | |
5821 | else | |
5822 | record_alias_subset (new_set, old_set); | |
5823 | } | |
5824 | } | |
5825 | break; | |
5826 | ||
5827 | default: | |
5828 | gcc_unreachable (); | |
5829 | } | |
c3734896 | 5830 | |
a1ab4c31 AC |
5831 | record_component_aliases (gnu_new_type); |
5832 | } | |
5833 | \f | |
a1ab4c31 AC |
5834 | /* Return true if the size represented by GNU_SIZE can be handled by an |
5835 | allocation. If STATIC_P is true, consider only what can be done with a | |
5836 | static allocation. */ | |
5837 | ||
5838 | static bool | |
5839 | allocatable_size_p (tree gnu_size, bool static_p) | |
5840 | { | |
5841 | HOST_WIDE_INT our_size; | |
5842 | ||
5843 | /* If this is not a static allocation, the only case we want to forbid | |
5844 | is an overflowing size. That will be converted into a raise a | |
5845 | Storage_Error. */ | |
5846 | if (!static_p) | |
5847 | return !(TREE_CODE (gnu_size) == INTEGER_CST | |
5848 | && TREE_OVERFLOW (gnu_size)); | |
5849 | ||
5850 | /* Otherwise, we need to deal with both variable sizes and constant | |
5851 | sizes that won't fit in a host int. We use int instead of HOST_WIDE_INT | |
5852 | since assemblers may not like very large sizes. */ | |
5853 | if (!host_integerp (gnu_size, 1)) | |
5854 | return false; | |
5855 | ||
5856 | our_size = tree_low_cst (gnu_size, 1); | |
5857 | return (int) our_size == our_size; | |
5858 | } | |
5859 | \f | |
5860 | /* Prepend to ATTR_LIST an entry for an attribute with provided TYPE, | |
5861 | NAME, ARGS and ERROR_POINT. */ | |
5862 | ||
5863 | static void | |
5864 | prepend_one_attribute_to (struct attrib ** attr_list, | |
5865 | enum attr_type attr_type, | |
5866 | tree attr_name, | |
5867 | tree attr_args, | |
5868 | Node_Id attr_error_point) | |
5869 | { | |
5870 | struct attrib * attr = (struct attrib *) xmalloc (sizeof (struct attrib)); | |
5871 | ||
5872 | attr->type = attr_type; | |
5873 | attr->name = attr_name; | |
5874 | attr->args = attr_args; | |
5875 | attr->error_point = attr_error_point; | |
5876 | ||
5877 | attr->next = *attr_list; | |
5878 | *attr_list = attr; | |
5879 | } | |
5880 | ||
5881 | /* Prepend to ATTR_LIST the list of attributes for GNAT_ENTITY, if any. */ | |
5882 | ||
5883 | static void | |
5884 | prepend_attributes (Entity_Id gnat_entity, struct attrib ** attr_list) | |
5885 | { | |
5886 | Node_Id gnat_temp; | |
5887 | ||
d81b4c61 RD |
5888 | /* Attributes are stored as Representation Item pragmas. */ |
5889 | ||
a1ab4c31 AC |
5890 | for (gnat_temp = First_Rep_Item (gnat_entity); Present (gnat_temp); |
5891 | gnat_temp = Next_Rep_Item (gnat_temp)) | |
5892 | if (Nkind (gnat_temp) == N_Pragma) | |
5893 | { | |
5894 | tree gnu_arg0 = NULL_TREE, gnu_arg1 = NULL_TREE; | |
5895 | Node_Id gnat_assoc = Pragma_Argument_Associations (gnat_temp); | |
5896 | enum attr_type etype; | |
5897 | ||
d81b4c61 RD |
5898 | /* Map the kind of pragma at hand. Skip if this is not one |
5899 | we know how to handle. */ | |
a1ab4c31 AC |
5900 | |
5901 | switch (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_temp)))) | |
5902 | { | |
5903 | case Pragma_Machine_Attribute: | |
5904 | etype = ATTR_MACHINE_ATTRIBUTE; | |
5905 | break; | |
5906 | ||
5907 | case Pragma_Linker_Alias: | |
5908 | etype = ATTR_LINK_ALIAS; | |
5909 | break; | |
5910 | ||
5911 | case Pragma_Linker_Section: | |
5912 | etype = ATTR_LINK_SECTION; | |
5913 | break; | |
5914 | ||
5915 | case Pragma_Linker_Constructor: | |
5916 | etype = ATTR_LINK_CONSTRUCTOR; | |
5917 | break; | |
5918 | ||
5919 | case Pragma_Linker_Destructor: | |
5920 | etype = ATTR_LINK_DESTRUCTOR; | |
5921 | break; | |
5922 | ||
5923 | case Pragma_Weak_External: | |
5924 | etype = ATTR_WEAK_EXTERNAL; | |
5925 | break; | |
5926 | ||
40a14772 TG |
5927 | case Pragma_Thread_Local_Storage: |
5928 | etype = ATTR_THREAD_LOCAL_STORAGE; | |
5929 | break; | |
5930 | ||
a1ab4c31 AC |
5931 | default: |
5932 | continue; | |
5933 | } | |
5934 | ||
d81b4c61 RD |
5935 | /* See what arguments we have and turn them into GCC trees for |
5936 | attribute handlers. These expect identifier for strings. We | |
5937 | handle at most two arguments, static expressions only. */ | |
5938 | ||
5939 | if (Present (gnat_assoc) && Present (First (gnat_assoc))) | |
5940 | { | |
5941 | Node_Id gnat_arg0 = Next (First (gnat_assoc)); | |
5942 | Node_Id gnat_arg1 = Empty; | |
5943 | ||
5944 | if (Present (gnat_arg0) | |
5945 | && Is_Static_Expression (Expression (gnat_arg0))) | |
5946 | { | |
5947 | gnu_arg0 = gnat_to_gnu (Expression (gnat_arg0)); | |
5948 | ||
5949 | if (TREE_CODE (gnu_arg0) == STRING_CST) | |
5950 | gnu_arg0 = get_identifier (TREE_STRING_POINTER (gnu_arg0)); | |
5951 | ||
5952 | gnat_arg1 = Next (gnat_arg0); | |
5953 | } | |
5954 | ||
5955 | if (Present (gnat_arg1) | |
5956 | && Is_Static_Expression (Expression (gnat_arg1))) | |
5957 | { | |
5958 | gnu_arg1 = gnat_to_gnu (Expression (gnat_arg1)); | |
5959 | ||
5960 | if (TREE_CODE (gnu_arg1) == STRING_CST) | |
5961 | gnu_arg1 = get_identifier (TREE_STRING_POINTER (gnu_arg1)); | |
5962 | } | |
5963 | } | |
a1ab4c31 AC |
5964 | |
5965 | /* Prepend to the list now. Make a list of the argument we might | |
5966 | have, as GCC expects it. */ | |
5967 | prepend_one_attribute_to | |
5968 | (attr_list, | |
5969 | etype, gnu_arg0, | |
5970 | (gnu_arg1 != NULL_TREE) | |
5971 | ? build_tree_list (NULL_TREE, gnu_arg1) : NULL_TREE, | |
5972 | Present (Next (First (gnat_assoc))) | |
5973 | ? Expression (Next (First (gnat_assoc))) : gnat_temp); | |
5974 | } | |
5975 | } | |
5976 | \f | |
a1ab4c31 AC |
5977 | /* Given a GNAT tree GNAT_EXPR, for an expression which is a value within a |
5978 | type definition (either a bound or a discriminant value) for GNAT_ENTITY, | |
a531043b EB |
5979 | return the GCC tree to use for that expression. GNU_NAME is the suffix |
5980 | to use if a variable needs to be created and DEFINITION is true if this | |
5981 | is a definition of GNAT_ENTITY. If NEED_VALUE is true, we need a result; | |
5982 | otherwise, we are just elaborating the expression for side-effects. If | |
5983 | NEED_DEBUG is true, we need a variable for debugging purposes even if it | |
1e17ef87 | 5984 | isn't needed for code generation. */ |
a1ab4c31 AC |
5985 | |
5986 | static tree | |
a531043b EB |
5987 | elaborate_expression (Node_Id gnat_expr, Entity_Id gnat_entity, tree gnu_name, |
5988 | bool definition, bool need_value, bool need_debug) | |
a1ab4c31 AC |
5989 | { |
5990 | tree gnu_expr; | |
5991 | ||
a531043b | 5992 | /* If we already elaborated this expression (e.g. it was involved |
a1ab4c31 AC |
5993 | in the definition of a private type), use the old value. */ |
5994 | if (present_gnu_tree (gnat_expr)) | |
5995 | return get_gnu_tree (gnat_expr); | |
5996 | ||
a531043b EB |
5997 | /* If we don't need a value and this is static or a discriminant, |
5998 | we don't need to do anything. */ | |
5999 | if (!need_value | |
6000 | && (Is_OK_Static_Expression (gnat_expr) | |
6001 | || (Nkind (gnat_expr) == N_Identifier | |
6002 | && Ekind (Entity (gnat_expr)) == E_Discriminant))) | |
6003 | return NULL_TREE; | |
6004 | ||
6005 | /* If it's a static expression, we don't need a variable for debugging. */ | |
6006 | if (need_debug && Is_OK_Static_Expression (gnat_expr)) | |
6007 | need_debug = false; | |
a1ab4c31 | 6008 | |
a531043b EB |
6009 | /* Otherwise, convert this tree to its GCC equivalent and elaborate it. */ |
6010 | gnu_expr = elaborate_expression_1 (gnat_to_gnu (gnat_expr), gnat_entity, | |
6011 | gnu_name, definition, need_debug); | |
a1ab4c31 AC |
6012 | |
6013 | /* Save the expression in case we try to elaborate this entity again. Since | |
2ddc34ba | 6014 | it's not a DECL, don't check it. Don't save if it's a discriminant. */ |
a1ab4c31 AC |
6015 | if (!CONTAINS_PLACEHOLDER_P (gnu_expr)) |
6016 | save_gnu_tree (gnat_expr, gnu_expr, true); | |
6017 | ||
6018 | return need_value ? gnu_expr : error_mark_node; | |
6019 | } | |
6020 | ||
a531043b | 6021 | /* Similar, but take a GNU expression and always return a result. */ |
a1ab4c31 AC |
6022 | |
6023 | static tree | |
a531043b EB |
6024 | elaborate_expression_1 (tree gnu_expr, Entity_Id gnat_entity, tree gnu_name, |
6025 | bool definition, bool need_debug) | |
a1ab4c31 | 6026 | { |
f230d759 | 6027 | const bool expr_global_p = Is_Public (gnat_entity) || global_bindings_p (); |
646f9414 | 6028 | bool expr_variable_p, use_variable; |
a1ab4c31 | 6029 | |
a531043b EB |
6030 | /* In most cases, we won't see a naked FIELD_DECL because a discriminant |
6031 | reference will have been replaced with a COMPONENT_REF when the type | |
6032 | is being elaborated. However, there are some cases involving child | |
6033 | types where we will. So convert it to a COMPONENT_REF. We hope it | |
6034 | will be at the highest level of the expression in these cases. */ | |
a1ab4c31 AC |
6035 | if (TREE_CODE (gnu_expr) == FIELD_DECL) |
6036 | gnu_expr = build3 (COMPONENT_REF, TREE_TYPE (gnu_expr), | |
6037 | build0 (PLACEHOLDER_EXPR, DECL_CONTEXT (gnu_expr)), | |
6038 | gnu_expr, NULL_TREE); | |
6039 | ||
f230d759 EB |
6040 | /* If GNU_EXPR contains a placeholder, just return it. We rely on the fact |
6041 | that an expression cannot contain both a discriminant and a variable. */ | |
6042 | if (CONTAINS_PLACEHOLDER_P (gnu_expr)) | |
6043 | return gnu_expr; | |
6044 | ||
6045 | /* If GNU_EXPR is neither a constant nor based on a read-only variable, make | |
6046 | a variable that is initialized to contain the expression when the package | |
6047 | containing the definition is elaborated. If this entity is defined at top | |
6048 | level, replace the expression by the variable; otherwise use a SAVE_EXPR | |
6049 | if this is necessary. */ | |
6050 | if (CONSTANT_CLASS_P (gnu_expr)) | |
6051 | expr_variable_p = false; | |
6052 | else | |
6053 | { | |
6054 | /* Skip any conversions and simple arithmetics to see if the expression | |
6055 | is based on a read-only variable. | |
6056 | ??? This really should remain read-only, but we have to think about | |
6057 | the typing of the tree here. */ | |
6058 | tree inner | |
6059 | = skip_simple_arithmetic (remove_conversions (gnu_expr, true)); | |
6060 | ||
6061 | if (handled_component_p (inner)) | |
6062 | { | |
6063 | HOST_WIDE_INT bitsize, bitpos; | |
6064 | tree offset; | |
6065 | enum machine_mode mode; | |
6066 | int unsignedp, volatilep; | |
6067 | ||
6068 | inner = get_inner_reference (inner, &bitsize, &bitpos, &offset, | |
6069 | &mode, &unsignedp, &volatilep, false); | |
6070 | /* If the offset is variable, err on the side of caution. */ | |
6071 | if (offset) | |
6072 | inner = NULL_TREE; | |
6073 | } | |
6074 | ||
6075 | expr_variable_p | |
6076 | = !(inner | |
6077 | && TREE_CODE (inner) == VAR_DECL | |
6078 | && (TREE_READONLY (inner) || DECL_READONLY_ONCE_ELAB (inner))); | |
6079 | } | |
a1ab4c31 | 6080 | |
646f9414 EB |
6081 | /* We only need to use the variable if we are in a global context since GCC |
6082 | can do the right thing in the local case. However, when not optimizing, | |
6083 | use it for bounds of loop iteration scheme to avoid code duplication. */ | |
6084 | use_variable = expr_variable_p | |
6085 | && (expr_global_p | |
6086 | || (!optimize | |
6087 | && Is_Itype (gnat_entity) | |
6088 | && Nkind (Associated_Node_For_Itype (gnat_entity)) | |
6089 | == N_Loop_Parameter_Specification)); | |
6090 | ||
6091 | /* Now create it, possibly only for debugging purposes. */ | |
6092 | if (use_variable || need_debug) | |
bf7eefab EB |
6093 | { |
6094 | tree gnu_decl | |
6095 | = create_var_decl (create_concat_name (gnat_entity, | |
6096 | IDENTIFIER_POINTER (gnu_name)), | |
6097 | NULL_TREE, TREE_TYPE (gnu_expr), gnu_expr, | |
6098 | !need_debug, Is_Public (gnat_entity), | |
6099 | !definition, expr_global_p, NULL, gnat_entity); | |
6100 | ||
6101 | if (use_variable) | |
6102 | return gnu_decl; | |
6103 | } | |
a531043b | 6104 | |
f230d759 | 6105 | return expr_variable_p ? gnat_save_expr (gnu_expr) : gnu_expr; |
a1ab4c31 | 6106 | } |
da01bfee EB |
6107 | |
6108 | /* Similar, but take an alignment factor and make it explicit in the tree. */ | |
6109 | ||
6110 | static tree | |
6111 | elaborate_expression_2 (tree gnu_expr, Entity_Id gnat_entity, tree gnu_name, | |
6112 | bool definition, bool need_debug, unsigned int align) | |
6113 | { | |
6114 | tree unit_align = size_int (align / BITS_PER_UNIT); | |
6115 | return | |
6116 | size_binop (MULT_EXPR, | |
6117 | elaborate_expression_1 (size_binop (EXACT_DIV_EXPR, | |
6118 | gnu_expr, | |
6119 | unit_align), | |
6120 | gnat_entity, gnu_name, definition, | |
6121 | need_debug), | |
6122 | unit_align); | |
6123 | } | |
a1ab4c31 AC |
6124 | \f |
6125 | /* Create a record type that contains a SIZE bytes long field of TYPE with a | |
6126 | starting bit position so that it is aligned to ALIGN bits, and leaving at | |
6127 | least ROOM bytes free before the field. BASE_ALIGN is the alignment the | |
6128 | record is guaranteed to get. */ | |
6129 | ||
6130 | tree | |
6131 | make_aligning_type (tree type, unsigned int align, tree size, | |
6132 | unsigned int base_align, int room) | |
6133 | { | |
6134 | /* We will be crafting a record type with one field at a position set to be | |
6135 | the next multiple of ALIGN past record'address + room bytes. We use a | |
6136 | record placeholder to express record'address. */ | |
a1ab4c31 AC |
6137 | tree record_type = make_node (RECORD_TYPE); |
6138 | tree record = build0 (PLACEHOLDER_EXPR, record_type); | |
6139 | ||
6140 | tree record_addr_st | |
6141 | = convert (sizetype, build_unary_op (ADDR_EXPR, NULL_TREE, record)); | |
6142 | ||
6143 | /* The diagram below summarizes the shape of what we manipulate: | |
6144 | ||
6145 | <--------- pos ----------> | |
6146 | { +------------+-------------+-----------------+ | |
6147 | record =>{ |############| ... | field (type) | | |
6148 | { +------------+-------------+-----------------+ | |
6149 | |<-- room -->|<- voffset ->|<---- size ----->| | |
6150 | o o | |
6151 | | | | |
6152 | record_addr vblock_addr | |
6153 | ||
6154 | Every length is in sizetype bytes there, except "pos" which has to be | |
6155 | set as a bit position in the GCC tree for the record. */ | |
a1ab4c31 AC |
6156 | tree room_st = size_int (room); |
6157 | tree vblock_addr_st = size_binop (PLUS_EXPR, record_addr_st, room_st); | |
6158 | tree voffset_st, pos, field; | |
6159 | ||
6160 | tree name = TYPE_NAME (type); | |
6161 | ||
6162 | if (TREE_CODE (name) == TYPE_DECL) | |
6163 | name = DECL_NAME (name); | |
9c026b87 EB |
6164 | name = concat_name (name, "ALIGN"); |
6165 | TYPE_NAME (record_type) = name; | |
a1ab4c31 AC |
6166 | |
6167 | /* Compute VOFFSET and then POS. The next byte position multiple of some | |
6168 | alignment after some address is obtained by "and"ing the alignment minus | |
6169 | 1 with the two's complement of the address. */ | |
a1ab4c31 | 6170 | voffset_st = size_binop (BIT_AND_EXPR, |
1081f5a7 EB |
6171 | fold_build1 (NEGATE_EXPR, sizetype, vblock_addr_st), |
6172 | size_int ((align / BITS_PER_UNIT) - 1)); | |
a1ab4c31 AC |
6173 | |
6174 | /* POS = (ROOM + VOFFSET) * BIT_PER_UNIT, in bitsizetype. */ | |
a1ab4c31 AC |
6175 | pos = size_binop (MULT_EXPR, |
6176 | convert (bitsizetype, | |
6177 | size_binop (PLUS_EXPR, room_st, voffset_st)), | |
6178 | bitsize_unit_node); | |
6179 | ||
6180 | /* Craft the GCC record representation. We exceptionally do everything | |
6181 | manually here because 1) our generic circuitry is not quite ready to | |
6182 | handle the complex position/size expressions we are setting up, 2) we | |
6183 | have a strong simplifying factor at hand: we know the maximum possible | |
6184 | value of voffset, and 3) we have to set/reset at least the sizes in | |
6185 | accordance with this maximum value anyway, as we need them to convey | |
6186 | what should be "alloc"ated for this type. | |
6187 | ||
6188 | Use -1 as the 'addressable' indication for the field to prevent the | |
6189 | creation of a bitfield. We don't need one, it would have damaging | |
6190 | consequences on the alignment computation, and create_field_decl would | |
6191 | make one without this special argument, for instance because of the | |
6192 | complex position expression. */ | |
da01bfee EB |
6193 | field = create_field_decl (get_identifier ("F"), type, record_type, size, |
6194 | pos, 1, -1); | |
a1ab4c31 AC |
6195 | TYPE_FIELDS (record_type) = field; |
6196 | ||
6197 | TYPE_ALIGN (record_type) = base_align; | |
6198 | TYPE_USER_ALIGN (record_type) = 1; | |
6199 | ||
6200 | TYPE_SIZE (record_type) | |
6201 | = size_binop (PLUS_EXPR, | |
6202 | size_binop (MULT_EXPR, convert (bitsizetype, size), | |
6203 | bitsize_unit_node), | |
6204 | bitsize_int (align + room * BITS_PER_UNIT)); | |
6205 | TYPE_SIZE_UNIT (record_type) | |
6206 | = size_binop (PLUS_EXPR, size, | |
6207 | size_int (room + align / BITS_PER_UNIT)); | |
6208 | ||
6f9f0ce3 | 6209 | SET_TYPE_MODE (record_type, BLKmode); |
794511d2 | 6210 | relate_alias_sets (record_type, type, ALIAS_SET_COPY); |
9c026b87 EB |
6211 | |
6212 | /* Declare it now since it will never be declared otherwise. This is | |
6213 | necessary to ensure that its subtrees are properly marked. */ | |
6214 | create_type_decl (name, record_type, NULL, true, false, Empty); | |
6215 | ||
a1ab4c31 AC |
6216 | return record_type; |
6217 | } | |
6218 | \f | |
6219 | /* Return the result of rounding T up to ALIGN. */ | |
6220 | ||
6221 | static inline unsigned HOST_WIDE_INT | |
6222 | round_up_to_align (unsigned HOST_WIDE_INT t, unsigned int align) | |
6223 | { | |
6224 | t += align - 1; | |
6225 | t /= align; | |
6226 | t *= align; | |
6227 | return t; | |
6228 | } | |
6229 | ||
6230 | /* TYPE is a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE that is being used | |
6231 | as the field type of a packed record if IN_RECORD is true, or as the | |
6232 | component type of a packed array if IN_RECORD is false. See if we can | |
6233 | rewrite it either as a type that has a non-BLKmode, which we can pack | |
39ae51e0 EB |
6234 | tighter in the packed record case, or as a smaller type. If so, return |
6235 | the new type. If not, return the original type. */ | |
a1ab4c31 AC |
6236 | |
6237 | static tree | |
6238 | make_packable_type (tree type, bool in_record) | |
6239 | { | |
6240 | unsigned HOST_WIDE_INT size = tree_low_cst (TYPE_SIZE (type), 1); | |
6241 | unsigned HOST_WIDE_INT new_size; | |
6242 | tree new_type, old_field, field_list = NULL_TREE; | |
6243 | ||
6244 | /* No point in doing anything if the size is zero. */ | |
6245 | if (size == 0) | |
6246 | return type; | |
6247 | ||
6248 | new_type = make_node (TREE_CODE (type)); | |
6249 | ||
6250 | /* Copy the name and flags from the old type to that of the new. | |
6251 | Note that we rely on the pointer equality created here for | |
6252 | TYPE_NAME to look through conversions in various places. */ | |
6253 | TYPE_NAME (new_type) = TYPE_NAME (type); | |
6254 | TYPE_JUSTIFIED_MODULAR_P (new_type) = TYPE_JUSTIFIED_MODULAR_P (type); | |
6255 | TYPE_CONTAINS_TEMPLATE_P (new_type) = TYPE_CONTAINS_TEMPLATE_P (type); | |
6256 | if (TREE_CODE (type) == RECORD_TYPE) | |
315cff15 | 6257 | TYPE_PADDING_P (new_type) = TYPE_PADDING_P (type); |
a1ab4c31 AC |
6258 | |
6259 | /* If we are in a record and have a small size, set the alignment to | |
6260 | try for an integral mode. Otherwise set it to try for a smaller | |
6261 | type with BLKmode. */ | |
6262 | if (in_record && size <= MAX_FIXED_MODE_SIZE) | |
6263 | { | |
6264 | TYPE_ALIGN (new_type) = ceil_alignment (size); | |
6265 | new_size = round_up_to_align (size, TYPE_ALIGN (new_type)); | |
6266 | } | |
6267 | else | |
6268 | { | |
6269 | unsigned HOST_WIDE_INT align; | |
6270 | ||
6271 | /* Do not try to shrink the size if the RM size is not constant. */ | |
6272 | if (TYPE_CONTAINS_TEMPLATE_P (type) | |
6273 | || !host_integerp (TYPE_ADA_SIZE (type), 1)) | |
6274 | return type; | |
6275 | ||
6276 | /* Round the RM size up to a unit boundary to get the minimal size | |
6277 | for a BLKmode record. Give up if it's already the size. */ | |
6278 | new_size = TREE_INT_CST_LOW (TYPE_ADA_SIZE (type)); | |
6279 | new_size = round_up_to_align (new_size, BITS_PER_UNIT); | |
6280 | if (new_size == size) | |
6281 | return type; | |
6282 | ||
6283 | align = new_size & -new_size; | |
6284 | TYPE_ALIGN (new_type) = MIN (TYPE_ALIGN (type), align); | |
6285 | } | |
6286 | ||
6287 | TYPE_USER_ALIGN (new_type) = 1; | |
6288 | ||
6289 | /* Now copy the fields, keeping the position and size as we don't want | |
6290 | to change the layout by propagating the packedness downwards. */ | |
6291 | for (old_field = TYPE_FIELDS (type); old_field; | |
910ad8de | 6292 | old_field = DECL_CHAIN (old_field)) |
a1ab4c31 AC |
6293 | { |
6294 | tree new_field_type = TREE_TYPE (old_field); | |
6295 | tree new_field, new_size; | |
6296 | ||
39ae51e0 EB |
6297 | if ((TREE_CODE (new_field_type) == RECORD_TYPE |
6298 | || TREE_CODE (new_field_type) == UNION_TYPE | |
6299 | || TREE_CODE (new_field_type) == QUAL_UNION_TYPE) | |
315cff15 | 6300 | && !TYPE_FAT_POINTER_P (new_field_type) |
a1ab4c31 AC |
6301 | && host_integerp (TYPE_SIZE (new_field_type), 1)) |
6302 | new_field_type = make_packable_type (new_field_type, true); | |
6303 | ||
6304 | /* However, for the last field in a not already packed record type | |
b4680ca1 | 6305 | that is of an aggregate type, we need to use the RM size in the |
a1ab4c31 | 6306 | packable version of the record type, see finish_record_type. */ |
910ad8de | 6307 | if (!DECL_CHAIN (old_field) |
a1ab4c31 AC |
6308 | && !TYPE_PACKED (type) |
6309 | && (TREE_CODE (new_field_type) == RECORD_TYPE | |
6310 | || TREE_CODE (new_field_type) == UNION_TYPE | |
6311 | || TREE_CODE (new_field_type) == QUAL_UNION_TYPE) | |
315cff15 | 6312 | && !TYPE_FAT_POINTER_P (new_field_type) |
a1ab4c31 AC |
6313 | && !TYPE_CONTAINS_TEMPLATE_P (new_field_type) |
6314 | && TYPE_ADA_SIZE (new_field_type)) | |
6315 | new_size = TYPE_ADA_SIZE (new_field_type); | |
6316 | else | |
6317 | new_size = DECL_SIZE (old_field); | |
6318 | ||
da01bfee EB |
6319 | new_field |
6320 | = create_field_decl (DECL_NAME (old_field), new_field_type, new_type, | |
6321 | new_size, bit_position (old_field), | |
6322 | TYPE_PACKED (type), | |
6323 | !DECL_NONADDRESSABLE_P (old_field)); | |
a1ab4c31 AC |
6324 | |
6325 | DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field); | |
cb3d597d | 6326 | SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, old_field); |
a1ab4c31 AC |
6327 | if (TREE_CODE (new_type) == QUAL_UNION_TYPE) |
6328 | DECL_QUALIFIER (new_field) = DECL_QUALIFIER (old_field); | |
6329 | ||
910ad8de | 6330 | DECL_CHAIN (new_field) = field_list; |
a1ab4c31 AC |
6331 | field_list = new_field; |
6332 | } | |
6333 | ||
032d1b71 | 6334 | finish_record_type (new_type, nreverse (field_list), 2, false); |
794511d2 | 6335 | relate_alias_sets (new_type, type, ALIAS_SET_COPY); |
eb601ae1 EB |
6336 | SET_DECL_PARALLEL_TYPE (TYPE_STUB_DECL (new_type), |
6337 | DECL_PARALLEL_TYPE (TYPE_STUB_DECL (type))); | |
a1ab4c31 AC |
6338 | |
6339 | /* If this is a padding record, we never want to make the size smaller | |
6340 | than what was specified. For QUAL_UNION_TYPE, also copy the size. */ | |
315cff15 | 6341 | if (TYPE_IS_PADDING_P (type) || TREE_CODE (type) == QUAL_UNION_TYPE) |
a1ab4c31 AC |
6342 | { |
6343 | TYPE_SIZE (new_type) = TYPE_SIZE (type); | |
6344 | TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (type); | |
d770e88d | 6345 | new_size = size; |
a1ab4c31 AC |
6346 | } |
6347 | else | |
6348 | { | |
6349 | TYPE_SIZE (new_type) = bitsize_int (new_size); | |
6350 | TYPE_SIZE_UNIT (new_type) | |
6351 | = size_int ((new_size + BITS_PER_UNIT - 1) / BITS_PER_UNIT); | |
6352 | } | |
6353 | ||
6354 | if (!TYPE_CONTAINS_TEMPLATE_P (type)) | |
6355 | SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (type)); | |
6356 | ||
6357 | compute_record_mode (new_type); | |
6358 | ||
6359 | /* Try harder to get a packable type if necessary, for example | |
6360 | in case the record itself contains a BLKmode field. */ | |
6361 | if (in_record && TYPE_MODE (new_type) == BLKmode) | |
6f9f0ce3 JJ |
6362 | SET_TYPE_MODE (new_type, |
6363 | mode_for_size_tree (TYPE_SIZE (new_type), MODE_INT, 1)); | |
a1ab4c31 AC |
6364 | |
6365 | /* If neither the mode nor the size has shrunk, return the old type. */ | |
6366 | if (TYPE_MODE (new_type) == BLKmode && new_size >= size) | |
6367 | return type; | |
6368 | ||
6369 | return new_type; | |
6370 | } | |
6371 | \f | |
6372 | /* Ensure that TYPE has SIZE and ALIGN. Make and return a new padded type | |
6373 | if needed. We have already verified that SIZE and TYPE are large enough. | |
afb4afcd EB |
6374 | GNAT_ENTITY is used to name the resulting record and to issue a warning. |
6375 | IS_COMPONENT_TYPE is true if this is being done for the component type | |
6376 | of an array. IS_USER_TYPE is true if we must complete the original type. | |
6377 | DEFINITION is true if this type is being defined. SAME_RM_SIZE is true | |
6378 | if the RM size of the resulting type is to be set to SIZE too; otherwise, | |
6379 | it's set to the RM size of the original type. */ | |
a1ab4c31 AC |
6380 | |
6381 | tree | |
6382 | maybe_pad_type (tree type, tree size, unsigned int align, | |
afb4afcd | 6383 | Entity_Id gnat_entity, bool is_component_type, |
a1ab4c31 AC |
6384 | bool is_user_type, bool definition, bool same_rm_size) |
6385 | { | |
6386 | tree orig_rm_size = same_rm_size ? NULL_TREE : rm_size (type); | |
6387 | tree orig_size = TYPE_SIZE (type); | |
a1ab4c31 AC |
6388 | tree record, field; |
6389 | ||
6390 | /* If TYPE is a padded type, see if it agrees with any size and alignment | |
6391 | we were given. If so, return the original type. Otherwise, strip | |
6392 | off the padding, since we will either be returning the inner type | |
6393 | or repadding it. If no size or alignment is specified, use that of | |
6394 | the original padded type. */ | |
315cff15 | 6395 | if (TYPE_IS_PADDING_P (type)) |
a1ab4c31 AC |
6396 | { |
6397 | if ((!size | |
6398 | || operand_equal_p (round_up (size, | |
6399 | MAX (align, TYPE_ALIGN (type))), | |
6400 | round_up (TYPE_SIZE (type), | |
6401 | MAX (align, TYPE_ALIGN (type))), | |
6402 | 0)) | |
6403 | && (align == 0 || align == TYPE_ALIGN (type))) | |
6404 | return type; | |
6405 | ||
6406 | if (!size) | |
6407 | size = TYPE_SIZE (type); | |
6408 | if (align == 0) | |
6409 | align = TYPE_ALIGN (type); | |
6410 | ||
6411 | type = TREE_TYPE (TYPE_FIELDS (type)); | |
6412 | orig_size = TYPE_SIZE (type); | |
6413 | } | |
6414 | ||
6415 | /* If the size is either not being changed or is being made smaller (which | |
4fd78fe6 | 6416 | is not done here and is only valid for bitfields anyway), show the size |
a1ab4c31 AC |
6417 | isn't changing. Likewise, clear the alignment if it isn't being |
6418 | changed. Then return if we aren't doing anything. */ | |
6419 | if (size | |
6420 | && (operand_equal_p (size, orig_size, 0) | |
6421 | || (TREE_CODE (orig_size) == INTEGER_CST | |
6422 | && tree_int_cst_lt (size, orig_size)))) | |
6423 | size = NULL_TREE; | |
6424 | ||
6425 | if (align == TYPE_ALIGN (type)) | |
6426 | align = 0; | |
6427 | ||
6428 | if (align == 0 && !size) | |
6429 | return type; | |
6430 | ||
6431 | /* If requested, complete the original type and give it a name. */ | |
6432 | if (is_user_type) | |
6433 | create_type_decl (get_entity_name (gnat_entity), type, | |
6434 | NULL, !Comes_From_Source (gnat_entity), | |
6435 | !(TYPE_NAME (type) | |
6436 | && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL | |
6437 | && DECL_IGNORED_P (TYPE_NAME (type))), | |
6438 | gnat_entity); | |
6439 | ||
6440 | /* We used to modify the record in place in some cases, but that could | |
6441 | generate incorrect debugging information. So make a new record | |
6442 | type and name. */ | |
6443 | record = make_node (RECORD_TYPE); | |
315cff15 | 6444 | TYPE_PADDING_P (record) = 1; |
a1ab4c31 AC |
6445 | |
6446 | if (Present (gnat_entity)) | |
afb4afcd | 6447 | TYPE_NAME (record) = create_concat_name (gnat_entity, "PAD"); |
a1ab4c31 AC |
6448 | |
6449 | TYPE_VOLATILE (record) | |
6450 | = Present (gnat_entity) && Treat_As_Volatile (gnat_entity); | |
6451 | ||
6452 | TYPE_ALIGN (record) = align; | |
a1ab4c31 AC |
6453 | TYPE_SIZE (record) = size ? size : orig_size; |
6454 | TYPE_SIZE_UNIT (record) | |
6455 | = convert (sizetype, | |
6456 | size_binop (CEIL_DIV_EXPR, TYPE_SIZE (record), | |
6457 | bitsize_unit_node)); | |
6458 | ||
6459 | /* If we are changing the alignment and the input type is a record with | |
6460 | BLKmode and a small constant size, try to make a form that has an | |
6461 | integral mode. This might allow the padding record to also have an | |
6462 | integral mode, which will be much more efficient. There is no point | |
6463 | in doing so if a size is specified unless it is also a small constant | |
6464 | size and it is incorrect to do so if we cannot guarantee that the mode | |
6465 | will be naturally aligned since the field must always be addressable. | |
6466 | ||
6467 | ??? This might not always be a win when done for a stand-alone object: | |
6468 | since the nominal and the effective type of the object will now have | |
6469 | different modes, a VIEW_CONVERT_EXPR will be required for converting | |
6470 | between them and it might be hard to overcome afterwards, including | |
6471 | at the RTL level when the stand-alone object is accessed as a whole. */ | |
6472 | if (align != 0 | |
6473 | && TREE_CODE (type) == RECORD_TYPE | |
6474 | && TYPE_MODE (type) == BLKmode | |
6475 | && TREE_CODE (orig_size) == INTEGER_CST | |
bd9f68e0 | 6476 | && !TREE_OVERFLOW (orig_size) |
a1ab4c31 AC |
6477 | && compare_tree_int (orig_size, MAX_FIXED_MODE_SIZE) <= 0 |
6478 | && (!size | |
6479 | || (TREE_CODE (size) == INTEGER_CST | |
6480 | && compare_tree_int (size, MAX_FIXED_MODE_SIZE) <= 0))) | |
6481 | { | |
6482 | tree packable_type = make_packable_type (type, true); | |
6483 | if (TYPE_MODE (packable_type) != BLKmode | |
6484 | && align >= TYPE_ALIGN (packable_type)) | |
6485 | type = packable_type; | |
6486 | } | |
6487 | ||
6488 | /* Now create the field with the original size. */ | |
da01bfee EB |
6489 | field = create_field_decl (get_identifier ("F"), type, record, orig_size, |
6490 | bitsize_zero_node, 0, 1); | |
a1ab4c31 AC |
6491 | DECL_INTERNAL_P (field) = 1; |
6492 | ||
032d1b71 EB |
6493 | /* Do not emit debug info until after the auxiliary record is built. */ |
6494 | finish_record_type (record, field, 1, false); | |
a1ab4c31 | 6495 | |
b4680ca1 EB |
6496 | /* Set the same size for its RM size if requested; otherwise reuse |
6497 | the RM size of the original type. */ | |
a1ab4c31 AC |
6498 | SET_TYPE_ADA_SIZE (record, same_rm_size ? size : orig_rm_size); |
6499 | ||
6500 | /* Unless debugging information isn't being written for the input type, | |
6501 | write a record that shows what we are a subtype of and also make a | |
2ddc34ba | 6502 | variable that indicates our size, if still variable. */ |
032d1b71 EB |
6503 | if (TREE_CODE (orig_size) != INTEGER_CST |
6504 | && TYPE_NAME (record) | |
6505 | && TYPE_NAME (type) | |
a1ab4c31 AC |
6506 | && !(TREE_CODE (TYPE_NAME (type)) == TYPE_DECL |
6507 | && DECL_IGNORED_P (TYPE_NAME (type)))) | |
6508 | { | |
6509 | tree marker = make_node (RECORD_TYPE); | |
6510 | tree name = TYPE_NAME (record); | |
6511 | tree orig_name = TYPE_NAME (type); | |
6512 | ||
6513 | if (TREE_CODE (name) == TYPE_DECL) | |
6514 | name = DECL_NAME (name); | |
6515 | ||
6516 | if (TREE_CODE (orig_name) == TYPE_DECL) | |
6517 | orig_name = DECL_NAME (orig_name); | |
6518 | ||
0fb2335d | 6519 | TYPE_NAME (marker) = concat_name (name, "XVS"); |
a1ab4c31 | 6520 | finish_record_type (marker, |
c244bf8f EB |
6521 | create_field_decl (orig_name, |
6522 | build_reference_type (type), | |
da01bfee EB |
6523 | marker, NULL_TREE, NULL_TREE, |
6524 | 0, 0), | |
032d1b71 | 6525 | 0, true); |
a1ab4c31 AC |
6526 | |
6527 | add_parallel_type (TYPE_STUB_DECL (record), marker); | |
6528 | ||
e9cfc9b5 | 6529 | if (definition && size && TREE_CODE (size) != INTEGER_CST) |
b5bba4a6 EB |
6530 | TYPE_SIZE_UNIT (marker) |
6531 | = create_var_decl (concat_name (name, "XVZ"), NULL_TREE, sizetype, | |
6532 | TYPE_SIZE_UNIT (record), false, false, false, | |
6533 | false, NULL, gnat_entity); | |
a1ab4c31 AC |
6534 | } |
6535 | ||
6536 | rest_of_record_type_compilation (record); | |
6537 | ||
6538 | /* If the size was widened explicitly, maybe give a warning. Take the | |
6539 | original size as the maximum size of the input if there was an | |
6540 | unconstrained record involved and round it up to the specified alignment, | |
6541 | if one was specified. */ | |
6542 | if (CONTAINS_PLACEHOLDER_P (orig_size)) | |
6543 | orig_size = max_size (orig_size, true); | |
6544 | ||
6545 | if (align) | |
6546 | orig_size = round_up (orig_size, align); | |
6547 | ||
2cac6017 EB |
6548 | if (Present (gnat_entity) |
6549 | && size | |
1aa8b1dd | 6550 | && TREE_CODE (size) != MAX_EXPR |
1081f5a7 | 6551 | && TREE_CODE (size) != COND_EXPR |
a1ab4c31 AC |
6552 | && !operand_equal_p (size, orig_size, 0) |
6553 | && !(TREE_CODE (size) == INTEGER_CST | |
6554 | && TREE_CODE (orig_size) == INTEGER_CST | |
586388fd EB |
6555 | && (TREE_OVERFLOW (size) |
6556 | || TREE_OVERFLOW (orig_size) | |
6557 | || tree_int_cst_lt (size, orig_size)))) | |
a1ab4c31 AC |
6558 | { |
6559 | Node_Id gnat_error_node = Empty; | |
6560 | ||
6561 | if (Is_Packed_Array_Type (gnat_entity)) | |
6562 | gnat_entity = Original_Array_Type (gnat_entity); | |
6563 | ||
6564 | if ((Ekind (gnat_entity) == E_Component | |
6565 | || Ekind (gnat_entity) == E_Discriminant) | |
6566 | && Present (Component_Clause (gnat_entity))) | |
6567 | gnat_error_node = Last_Bit (Component_Clause (gnat_entity)); | |
6568 | else if (Present (Size_Clause (gnat_entity))) | |
6569 | gnat_error_node = Expression (Size_Clause (gnat_entity)); | |
6570 | ||
6571 | /* Generate message only for entities that come from source, since | |
6572 | if we have an entity created by expansion, the message will be | |
6573 | generated for some other corresponding source entity. */ | |
2cac6017 EB |
6574 | if (Comes_From_Source (gnat_entity)) |
6575 | { | |
6576 | if (Present (gnat_error_node)) | |
6577 | post_error_ne_tree ("{^ }bits of & unused?", | |
6578 | gnat_error_node, gnat_entity, | |
6579 | size_diffop (size, orig_size)); | |
afb4afcd | 6580 | else if (is_component_type) |
2cac6017 EB |
6581 | post_error_ne_tree ("component of& padded{ by ^ bits}?", |
6582 | gnat_entity, gnat_entity, | |
6583 | size_diffop (size, orig_size)); | |
6584 | } | |
a1ab4c31 AC |
6585 | } |
6586 | ||
6587 | return record; | |
6588 | } | |
6589 | \f | |
6590 | /* Given a GNU tree and a GNAT list of choices, generate an expression to test | |
6591 | the value passed against the list of choices. */ | |
6592 | ||
6593 | tree | |
6594 | choices_to_gnu (tree operand, Node_Id choices) | |
6595 | { | |
6596 | Node_Id choice; | |
6597 | Node_Id gnat_temp; | |
bf6490b5 | 6598 | tree result = boolean_false_node; |
a1ab4c31 AC |
6599 | tree this_test, low = 0, high = 0, single = 0; |
6600 | ||
6601 | for (choice = First (choices); Present (choice); choice = Next (choice)) | |
6602 | { | |
6603 | switch (Nkind (choice)) | |
6604 | { | |
6605 | case N_Range: | |
6606 | low = gnat_to_gnu (Low_Bound (choice)); | |
6607 | high = gnat_to_gnu (High_Bound (choice)); | |
6608 | ||
a1ab4c31 | 6609 | this_test |
1139f2e8 EB |
6610 | = build_binary_op (TRUTH_ANDIF_EXPR, boolean_type_node, |
6611 | build_binary_op (GE_EXPR, boolean_type_node, | |
a1ab4c31 | 6612 | operand, low), |
1139f2e8 | 6613 | build_binary_op (LE_EXPR, boolean_type_node, |
a1ab4c31 AC |
6614 | operand, high)); |
6615 | ||
6616 | break; | |
6617 | ||
6618 | case N_Subtype_Indication: | |
6619 | gnat_temp = Range_Expression (Constraint (choice)); | |
6620 | low = gnat_to_gnu (Low_Bound (gnat_temp)); | |
6621 | high = gnat_to_gnu (High_Bound (gnat_temp)); | |
6622 | ||
6623 | this_test | |
1139f2e8 EB |
6624 | = build_binary_op (TRUTH_ANDIF_EXPR, boolean_type_node, |
6625 | build_binary_op (GE_EXPR, boolean_type_node, | |
a1ab4c31 | 6626 | operand, low), |
1139f2e8 | 6627 | build_binary_op (LE_EXPR, boolean_type_node, |
a1ab4c31 AC |
6628 | operand, high)); |
6629 | break; | |
6630 | ||
6631 | case N_Identifier: | |
6632 | case N_Expanded_Name: | |
6633 | /* This represents either a subtype range, an enumeration | |
6634 | literal, or a constant Ekind says which. If an enumeration | |
6635 | literal or constant, fall through to the next case. */ | |
6636 | if (Ekind (Entity (choice)) != E_Enumeration_Literal | |
6637 | && Ekind (Entity (choice)) != E_Constant) | |
6638 | { | |
6639 | tree type = gnat_to_gnu_type (Entity (choice)); | |
6640 | ||
6641 | low = TYPE_MIN_VALUE (type); | |
6642 | high = TYPE_MAX_VALUE (type); | |
6643 | ||
6644 | this_test | |
1139f2e8 EB |
6645 | = build_binary_op (TRUTH_ANDIF_EXPR, boolean_type_node, |
6646 | build_binary_op (GE_EXPR, boolean_type_node, | |
a1ab4c31 | 6647 | operand, low), |
1139f2e8 | 6648 | build_binary_op (LE_EXPR, boolean_type_node, |
a1ab4c31 AC |
6649 | operand, high)); |
6650 | break; | |
6651 | } | |
2ddc34ba | 6652 | |
a1ab4c31 | 6653 | /* ... fall through ... */ |
2ddc34ba | 6654 | |
a1ab4c31 AC |
6655 | case N_Character_Literal: |
6656 | case N_Integer_Literal: | |
6657 | single = gnat_to_gnu (choice); | |
1139f2e8 | 6658 | this_test = build_binary_op (EQ_EXPR, boolean_type_node, operand, |
a1ab4c31 AC |
6659 | single); |
6660 | break; | |
6661 | ||
6662 | case N_Others_Choice: | |
bf6490b5 | 6663 | this_test = boolean_true_node; |
a1ab4c31 AC |
6664 | break; |
6665 | ||
6666 | default: | |
6667 | gcc_unreachable (); | |
6668 | } | |
6669 | ||
1139f2e8 EB |
6670 | result = build_binary_op (TRUTH_ORIF_EXPR, boolean_type_node, result, |
6671 | this_test); | |
a1ab4c31 AC |
6672 | } |
6673 | ||
6674 | return result; | |
6675 | } | |
6676 | \f | |
6677 | /* Adjust PACKED setting as passed to gnat_to_gnu_field for a field of | |
6678 | type FIELD_TYPE to be placed in RECORD_TYPE. Return the result. */ | |
6679 | ||
6680 | static int | |
6681 | adjust_packed (tree field_type, tree record_type, int packed) | |
6682 | { | |
6683 | /* If the field contains an item of variable size, we cannot pack it | |
6684 | because we cannot create temporaries of non-fixed size in case | |
6685 | we need to take the address of the field. See addressable_p and | |
6686 | the notes on the addressability issues for further details. */ | |
6687 | if (is_variable_size (field_type)) | |
6688 | return 0; | |
6689 | ||
6690 | /* If the alignment of the record is specified and the field type | |
6691 | is over-aligned, request Storage_Unit alignment for the field. */ | |
6692 | if (packed == -2) | |
6693 | { | |
6694 | if (TYPE_ALIGN (field_type) > TYPE_ALIGN (record_type)) | |
6695 | return -1; | |
6696 | else | |
6697 | return 0; | |
6698 | } | |
6699 | ||
6700 | return packed; | |
6701 | } | |
6702 | ||
6703 | /* Return a GCC tree for a field corresponding to GNAT_FIELD to be | |
6704 | placed in GNU_RECORD_TYPE. | |
6705 | ||
6706 | PACKED is 1 if the enclosing record is packed, -1 if the enclosing | |
6707 | record has Component_Alignment of Storage_Unit, -2 if the enclosing | |
6708 | record has a specified alignment. | |
6709 | ||
839f2864 EB |
6710 | DEFINITION is true if this field is for a record being defined. |
6711 | ||
6712 | DEBUG_INFO_P is true if we need to write debug information for types | |
6713 | that we may create in the process. */ | |
a1ab4c31 AC |
6714 | |
6715 | static tree | |
6716 | gnat_to_gnu_field (Entity_Id gnat_field, tree gnu_record_type, int packed, | |
839f2864 | 6717 | bool definition, bool debug_info_p) |
a1ab4c31 AC |
6718 | { |
6719 | tree gnu_field_id = get_entity_name (gnat_field); | |
6720 | tree gnu_field_type = gnat_to_gnu_type (Etype (gnat_field)); | |
6721 | tree gnu_field, gnu_size, gnu_pos; | |
6722 | bool needs_strict_alignment | |
6723 | = (Is_Aliased (gnat_field) || Strict_Alignment (Etype (gnat_field)) | |
6724 | || Treat_As_Volatile (gnat_field)); | |
6725 | ||
6726 | /* If this field requires strict alignment, we cannot pack it because | |
6727 | it would very likely be under-aligned in the record. */ | |
6728 | if (needs_strict_alignment) | |
6729 | packed = 0; | |
6730 | else | |
6731 | packed = adjust_packed (gnu_field_type, gnu_record_type, packed); | |
6732 | ||
6733 | /* If a size is specified, use it. Otherwise, if the record type is packed, | |
6734 | use the official RM size. See "Handling of Type'Size Values" in Einfo | |
6735 | for further details. */ | |
6736 | if (Known_Static_Esize (gnat_field)) | |
6737 | gnu_size = validate_size (Esize (gnat_field), gnu_field_type, | |
6738 | gnat_field, FIELD_DECL, false, true); | |
6739 | else if (packed == 1) | |
6740 | gnu_size = validate_size (RM_Size (Etype (gnat_field)), gnu_field_type, | |
6741 | gnat_field, FIELD_DECL, false, true); | |
6742 | else | |
6743 | gnu_size = NULL_TREE; | |
6744 | ||
d770e88d EB |
6745 | /* If we have a specified size that is smaller than that of the field's type, |
6746 | or a position is specified, and the field's type is a record that doesn't | |
6747 | require strict alignment, see if we can get either an integral mode form | |
6748 | of the type or a smaller form. If we can, show a size was specified for | |
6749 | the field if there wasn't one already, so we know to make this a bitfield | |
6750 | and avoid making things wider. | |
a1ab4c31 | 6751 | |
d770e88d EB |
6752 | Changing to an integral mode form is useful when the record is packed as |
6753 | we can then place the field at a non-byte-aligned position and so achieve | |
6754 | tighter packing. This is in addition required if the field shares a byte | |
6755 | with another field and the front-end lets the back-end handle the access | |
6756 | to the field, because GCC cannot handle non-byte-aligned BLKmode fields. | |
a1ab4c31 | 6757 | |
d770e88d EB |
6758 | Changing to a smaller form is required if the specified size is smaller |
6759 | than that of the field's type and the type contains sub-fields that are | |
6760 | padded, in order to avoid generating accesses to these sub-fields that | |
6761 | are wider than the field. | |
a1ab4c31 AC |
6762 | |
6763 | We avoid the transformation if it is not required or potentially useful, | |
6764 | as it might entail an increase of the field's alignment and have ripple | |
6765 | effects on the outer record type. A typical case is a field known to be | |
d770e88d EB |
6766 | byte-aligned and not to share a byte with another field. */ |
6767 | if (!needs_strict_alignment | |
6768 | && TREE_CODE (gnu_field_type) == RECORD_TYPE | |
315cff15 | 6769 | && !TYPE_FAT_POINTER_P (gnu_field_type) |
a1ab4c31 AC |
6770 | && host_integerp (TYPE_SIZE (gnu_field_type), 1) |
6771 | && (packed == 1 | |
6772 | || (gnu_size | |
6773 | && (tree_int_cst_lt (gnu_size, TYPE_SIZE (gnu_field_type)) | |
d770e88d EB |
6774 | || (Present (Component_Clause (gnat_field)) |
6775 | && !(UI_To_Int (Component_Bit_Offset (gnat_field)) | |
6776 | % BITS_PER_UNIT == 0 | |
6777 | && value_factor_p (gnu_size, BITS_PER_UNIT))))))) | |
a1ab4c31 | 6778 | { |
a1ab4c31 | 6779 | tree gnu_packable_type = make_packable_type (gnu_field_type, true); |
d770e88d | 6780 | if (gnu_packable_type != gnu_field_type) |
a1ab4c31 AC |
6781 | { |
6782 | gnu_field_type = gnu_packable_type; | |
a1ab4c31 AC |
6783 | if (!gnu_size) |
6784 | gnu_size = rm_size (gnu_field_type); | |
6785 | } | |
6786 | } | |
6787 | ||
6788 | /* If we are packing the record and the field is BLKmode, round the | |
6789 | size up to a byte boundary. */ | |
6790 | if (packed && TYPE_MODE (gnu_field_type) == BLKmode && gnu_size) | |
6791 | gnu_size = round_up (gnu_size, BITS_PER_UNIT); | |
6792 | ||
6793 | if (Present (Component_Clause (gnat_field))) | |
6794 | { | |
ec88784d AC |
6795 | Entity_Id gnat_parent |
6796 | = Parent_Subtype (Underlying_Type (Scope (gnat_field))); | |
6797 | ||
a1ab4c31 AC |
6798 | gnu_pos = UI_To_gnu (Component_Bit_Offset (gnat_field), bitsizetype); |
6799 | gnu_size = validate_size (Esize (gnat_field), gnu_field_type, | |
6800 | gnat_field, FIELD_DECL, false, true); | |
6801 | ||
ec88784d AC |
6802 | /* Ensure the position does not overlap with the parent subtype, if there |
6803 | is one. This test is omitted if the parent of the tagged type has a | |
6804 | full rep clause since, in this case, component clauses are allowed to | |
6805 | overlay the space allocated for the parent type and the front-end has | |
6806 | checked that there are no overlapping components. */ | |
6807 | if (Present (gnat_parent) && !Is_Fully_Repped_Tagged_Type (gnat_parent)) | |
a1ab4c31 | 6808 | { |
ec88784d | 6809 | tree gnu_parent = gnat_to_gnu_type (gnat_parent); |
a1ab4c31 AC |
6810 | |
6811 | if (TREE_CODE (TYPE_SIZE (gnu_parent)) == INTEGER_CST | |
6812 | && tree_int_cst_lt (gnu_pos, TYPE_SIZE (gnu_parent))) | |
6813 | { | |
6814 | post_error_ne_tree | |
6815 | ("offset of& must be beyond parent{, minimum allowed is ^}", | |
6816 | First_Bit (Component_Clause (gnat_field)), gnat_field, | |
6817 | TYPE_SIZE_UNIT (gnu_parent)); | |
6818 | } | |
6819 | } | |
6820 | ||
6821 | /* If this field needs strict alignment, ensure the record is | |
6822 | sufficiently aligned and that that position and size are | |
6823 | consistent with the alignment. */ | |
6824 | if (needs_strict_alignment) | |
6825 | { | |
6826 | TYPE_ALIGN (gnu_record_type) | |
6827 | = MAX (TYPE_ALIGN (gnu_record_type), TYPE_ALIGN (gnu_field_type)); | |
6828 | ||
6829 | if (gnu_size | |
6830 | && !operand_equal_p (gnu_size, TYPE_SIZE (gnu_field_type), 0)) | |
6831 | { | |
6832 | if (Is_Atomic (gnat_field) || Is_Atomic (Etype (gnat_field))) | |
6833 | post_error_ne_tree | |
6834 | ("atomic field& must be natural size of type{ (^)}", | |
6835 | Last_Bit (Component_Clause (gnat_field)), gnat_field, | |
6836 | TYPE_SIZE (gnu_field_type)); | |
6837 | ||
6838 | else if (Is_Aliased (gnat_field)) | |
6839 | post_error_ne_tree | |
6840 | ("size of aliased field& must be ^ bits", | |
6841 | Last_Bit (Component_Clause (gnat_field)), gnat_field, | |
6842 | TYPE_SIZE (gnu_field_type)); | |
6843 | ||
6844 | else if (Strict_Alignment (Etype (gnat_field))) | |
6845 | post_error_ne_tree | |
6846 | ("size of & with aliased or tagged components not ^ bits", | |
6847 | Last_Bit (Component_Clause (gnat_field)), gnat_field, | |
6848 | TYPE_SIZE (gnu_field_type)); | |
6849 | ||
6850 | gnu_size = NULL_TREE; | |
6851 | } | |
6852 | ||
6853 | if (!integer_zerop (size_binop | |
6854 | (TRUNC_MOD_EXPR, gnu_pos, | |
6855 | bitsize_int (TYPE_ALIGN (gnu_field_type))))) | |
6856 | { | |
6857 | if (Is_Aliased (gnat_field)) | |
6858 | post_error_ne_num | |
6859 | ("position of aliased field& must be multiple of ^ bits", | |
6860 | First_Bit (Component_Clause (gnat_field)), gnat_field, | |
6861 | TYPE_ALIGN (gnu_field_type)); | |
6862 | ||
6863 | else if (Treat_As_Volatile (gnat_field)) | |
6864 | post_error_ne_num | |
6865 | ("position of volatile field& must be multiple of ^ bits", | |
6866 | First_Bit (Component_Clause (gnat_field)), gnat_field, | |
6867 | TYPE_ALIGN (gnu_field_type)); | |
6868 | ||
6869 | else if (Strict_Alignment (Etype (gnat_field))) | |
6870 | post_error_ne_num | |
6871 | ("position of & with aliased or tagged components not multiple of ^ bits", | |
6872 | First_Bit (Component_Clause (gnat_field)), gnat_field, | |
6873 | TYPE_ALIGN (gnu_field_type)); | |
6874 | ||
6875 | else | |
6876 | gcc_unreachable (); | |
6877 | ||
6878 | gnu_pos = NULL_TREE; | |
6879 | } | |
6880 | } | |
6881 | ||
6882 | if (Is_Atomic (gnat_field)) | |
6883 | check_ok_for_atomic (gnu_field_type, gnat_field, false); | |
6884 | } | |
6885 | ||
6886 | /* If the record has rep clauses and this is the tag field, make a rep | |
6887 | clause for it as well. */ | |
6888 | else if (Has_Specified_Layout (Scope (gnat_field)) | |
6889 | && Chars (gnat_field) == Name_uTag) | |
6890 | { | |
6891 | gnu_pos = bitsize_zero_node; | |
6892 | gnu_size = TYPE_SIZE (gnu_field_type); | |
6893 | } | |
6894 | ||
6895 | else | |
6896 | gnu_pos = NULL_TREE; | |
6897 | ||
6898 | /* We need to make the size the maximum for the type if it is | |
6899 | self-referential and an unconstrained type. In that case, we can't | |
6900 | pack the field since we can't make a copy to align it. */ | |
6901 | if (TREE_CODE (gnu_field_type) == RECORD_TYPE | |
6902 | && !gnu_size | |
6903 | && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_field_type)) | |
6904 | && !Is_Constrained (Underlying_Type (Etype (gnat_field)))) | |
6905 | { | |
6906 | gnu_size = max_size (TYPE_SIZE (gnu_field_type), true); | |
6907 | packed = 0; | |
6908 | } | |
6909 | ||
6910 | /* If a size is specified, adjust the field's type to it. */ | |
6911 | if (gnu_size) | |
6912 | { | |
839f2864 EB |
6913 | tree orig_field_type; |
6914 | ||
a1ab4c31 AC |
6915 | /* If the field's type is justified modular, we would need to remove |
6916 | the wrapper to (better) meet the layout requirements. However we | |
6917 | can do so only if the field is not aliased to preserve the unique | |
6918 | layout and if the prescribed size is not greater than that of the | |
6919 | packed array to preserve the justification. */ | |
6920 | if (!needs_strict_alignment | |
6921 | && TREE_CODE (gnu_field_type) == RECORD_TYPE | |
6922 | && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type) | |
6923 | && tree_int_cst_compare (gnu_size, TYPE_ADA_SIZE (gnu_field_type)) | |
6924 | <= 0) | |
6925 | gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type)); | |
6926 | ||
6927 | gnu_field_type | |
6928 | = make_type_from_size (gnu_field_type, gnu_size, | |
6929 | Has_Biased_Representation (gnat_field)); | |
839f2864 EB |
6930 | |
6931 | orig_field_type = gnu_field_type; | |
a1ab4c31 | 6932 | gnu_field_type = maybe_pad_type (gnu_field_type, gnu_size, 0, gnat_field, |
afb4afcd | 6933 | false, false, definition, true); |
839f2864 EB |
6934 | |
6935 | /* If a padding record was made, declare it now since it will never be | |
6936 | declared otherwise. This is necessary to ensure that its subtrees | |
6937 | are properly marked. */ | |
6938 | if (gnu_field_type != orig_field_type | |
6939 | && !DECL_P (TYPE_NAME (gnu_field_type))) | |
6940 | create_type_decl (TYPE_NAME (gnu_field_type), gnu_field_type, NULL, | |
6941 | true, debug_info_p, gnat_field); | |
a1ab4c31 AC |
6942 | } |
6943 | ||
6944 | /* Otherwise (or if there was an error), don't specify a position. */ | |
6945 | else | |
6946 | gnu_pos = NULL_TREE; | |
6947 | ||
6948 | gcc_assert (TREE_CODE (gnu_field_type) != RECORD_TYPE | |
6949 | || !TYPE_CONTAINS_TEMPLATE_P (gnu_field_type)); | |
6950 | ||
6951 | /* Now create the decl for the field. */ | |
da01bfee EB |
6952 | gnu_field |
6953 | = create_field_decl (gnu_field_id, gnu_field_type, gnu_record_type, | |
6954 | gnu_size, gnu_pos, packed, Is_Aliased (gnat_field)); | |
a1ab4c31 AC |
6955 | Sloc_to_locus (Sloc (gnat_field), &DECL_SOURCE_LOCATION (gnu_field)); |
6956 | TREE_THIS_VOLATILE (gnu_field) = Treat_As_Volatile (gnat_field); | |
6957 | ||
6958 | if (Ekind (gnat_field) == E_Discriminant) | |
6959 | DECL_DISCRIMINANT_NUMBER (gnu_field) | |
6960 | = UI_To_gnu (Discriminant_Number (gnat_field), sizetype); | |
6961 | ||
6962 | return gnu_field; | |
6963 | } | |
6964 | \f | |
6965 | /* Return true if TYPE is a type with variable size, a padding type with a | |
6966 | field of variable size or is a record that has a field such a field. */ | |
6967 | ||
6968 | static bool | |
6969 | is_variable_size (tree type) | |
6970 | { | |
6971 | tree field; | |
6972 | ||
6973 | if (!TREE_CONSTANT (TYPE_SIZE (type))) | |
6974 | return true; | |
6975 | ||
315cff15 | 6976 | if (TYPE_IS_PADDING_P (type) |
a1ab4c31 AC |
6977 | && !TREE_CONSTANT (DECL_SIZE (TYPE_FIELDS (type)))) |
6978 | return true; | |
6979 | ||
6980 | if (TREE_CODE (type) != RECORD_TYPE | |
6981 | && TREE_CODE (type) != UNION_TYPE | |
6982 | && TREE_CODE (type) != QUAL_UNION_TYPE) | |
6983 | return false; | |
6984 | ||
910ad8de | 6985 | for (field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field)) |
a1ab4c31 AC |
6986 | if (is_variable_size (TREE_TYPE (field))) |
6987 | return true; | |
6988 | ||
6989 | return false; | |
6990 | } | |
6991 | \f | |
6992 | /* qsort comparer for the bit positions of two record components. */ | |
6993 | ||
6994 | static int | |
6995 | compare_field_bitpos (const PTR rt1, const PTR rt2) | |
6996 | { | |
6997 | const_tree const field1 = * (const_tree const *) rt1; | |
6998 | const_tree const field2 = * (const_tree const *) rt2; | |
6999 | const int ret | |
7000 | = tree_int_cst_compare (bit_position (field1), bit_position (field2)); | |
7001 | ||
7002 | return ret ? ret : (int) (DECL_UID (field1) - DECL_UID (field2)); | |
7003 | } | |
7004 | ||
8cd28148 EB |
7005 | /* Translate and chain the GNAT_COMPONENT_LIST to the GNU_FIELD_LIST, set |
7006 | the result as the field list of GNU_RECORD_TYPE and finish it up. When | |
7007 | called from gnat_to_gnu_entity during the processing of a record type | |
a6a29d0c EB |
7008 | definition, the GCC node for the parent, if any, will be the single field |
7009 | of GNU_RECORD_TYPE and the GCC nodes for the discriminants will be on the | |
7010 | GNU_FIELD_LIST. The other calls to this function are recursive calls for | |
7011 | the component list of a variant and, in this case, GNU_FIELD_LIST is empty. | |
a1ab4c31 AC |
7012 | |
7013 | PACKED is 1 if this is for a packed record, -1 if this is for a record | |
7014 | with Component_Alignment of Storage_Unit, -2 if this is for a record | |
7015 | with a specified alignment. | |
7016 | ||
032d1b71 | 7017 | DEFINITION is true if we are defining this record type. |
a1ab4c31 | 7018 | |
032d1b71 EB |
7019 | CANCEL_ALIGNMENT is true if the alignment should be zeroed before laying |
7020 | out the record. This means the alignment only serves to force fields to | |
7021 | be bitfields, but not to require the record to be that aligned. This is | |
7022 | used for variants. | |
7023 | ||
7024 | ALL_REP is true if a rep clause is present for all the fields. | |
a1ab4c31 | 7025 | |
032d1b71 EB |
7026 | UNCHECKED_UNION is true if we are building this type for a record with a |
7027 | Pragma Unchecked_Union. | |
a1ab4c31 | 7028 | |
ef0feeb2 | 7029 | DEBUG_INFO is true if we need to write debug information about the type. |
a1ab4c31 | 7030 | |
032d1b71 | 7031 | MAYBE_UNUSED is true if this type may be unused in the end; this doesn't |
ef0feeb2 | 7032 | mean that its contents may be unused as well, only the container itself. |
839f2864 | 7033 | |
ef0feeb2 EB |
7034 | REORDER is true if we are permitted to reorder components of this type. |
7035 | ||
7036 | P_GNU_REP_LIST, if nonzero, is a pointer to a list to which each field | |
7037 | with a rep clause is to be added; in this case, that is all that should | |
7038 | be done with such fields. */ | |
a1ab4c31 AC |
7039 | |
7040 | static void | |
8cd28148 | 7041 | components_to_record (tree gnu_record_type, Node_Id gnat_component_list, |
a1ab4c31 | 7042 | tree gnu_field_list, int packed, bool definition, |
ef0feeb2 EB |
7043 | bool cancel_alignment, bool all_rep, |
7044 | bool unchecked_union, bool debug_info, | |
7045 | bool maybe_unused, bool reorder, | |
7046 | tree *p_gnu_rep_list) | |
a1ab4c31 | 7047 | { |
a1ab4c31 | 7048 | bool all_rep_and_size = all_rep && TYPE_SIZE (gnu_record_type); |
8cd28148 EB |
7049 | bool layout_with_rep = false; |
7050 | Node_Id component_decl, variant_part; | |
ef0feeb2 EB |
7051 | tree gnu_field, gnu_next, gnu_last; |
7052 | tree gnu_variant_part = NULL_TREE; | |
7053 | tree gnu_rep_list = NULL_TREE; | |
7054 | tree gnu_var_list = NULL_TREE; | |
7055 | tree gnu_self_list = NULL_TREE; | |
a1ab4c31 | 7056 | |
8cd28148 EB |
7057 | /* For each component referenced in a component declaration create a GCC |
7058 | field and add it to the list, skipping pragmas in the GNAT list. */ | |
ef0feeb2 | 7059 | gnu_last = tree_last (gnu_field_list); |
8cd28148 EB |
7060 | if (Present (Component_Items (gnat_component_list))) |
7061 | for (component_decl | |
7062 | = First_Non_Pragma (Component_Items (gnat_component_list)); | |
a1ab4c31 AC |
7063 | Present (component_decl); |
7064 | component_decl = Next_Non_Pragma (component_decl)) | |
7065 | { | |
8cd28148 | 7066 | Entity_Id gnat_field = Defining_Entity (component_decl); |
a6a29d0c | 7067 | Name_Id gnat_name = Chars (gnat_field); |
a1ab4c31 | 7068 | |
a6a29d0c EB |
7069 | /* If present, the _Parent field must have been created as the single |
7070 | field of the record type. Put it before any other fields. */ | |
7071 | if (gnat_name == Name_uParent) | |
7072 | { | |
7073 | gnu_field = TYPE_FIELDS (gnu_record_type); | |
7074 | gnu_field_list = chainon (gnu_field_list, gnu_field); | |
7075 | } | |
a1ab4c31 AC |
7076 | else |
7077 | { | |
839f2864 | 7078 | gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type, packed, |
ef0feeb2 | 7079 | definition, debug_info); |
a1ab4c31 | 7080 | |
a6a29d0c EB |
7081 | /* If this is the _Tag field, put it before any other fields. */ |
7082 | if (gnat_name == Name_uTag) | |
a1ab4c31 | 7083 | gnu_field_list = chainon (gnu_field_list, gnu_field); |
a6a29d0c EB |
7084 | |
7085 | /* If this is the _Controller field, put it before the other | |
7086 | fields except for the _Tag or _Parent field. */ | |
7087 | else if (gnat_name == Name_uController && gnu_last) | |
7088 | { | |
910ad8de NF |
7089 | DECL_CHAIN (gnu_field) = DECL_CHAIN (gnu_last); |
7090 | DECL_CHAIN (gnu_last) = gnu_field; | |
a6a29d0c EB |
7091 | } |
7092 | ||
7093 | /* If this is a regular field, put it after the other fields. */ | |
a1ab4c31 AC |
7094 | else |
7095 | { | |
910ad8de | 7096 | DECL_CHAIN (gnu_field) = gnu_field_list; |
a1ab4c31 | 7097 | gnu_field_list = gnu_field; |
a6a29d0c EB |
7098 | if (!gnu_last) |
7099 | gnu_last = gnu_field; | |
a1ab4c31 AC |
7100 | } |
7101 | } | |
7102 | ||
2ddc34ba | 7103 | save_gnu_tree (gnat_field, gnu_field, false); |
a1ab4c31 AC |
7104 | } |
7105 | ||
7106 | /* At the end of the component list there may be a variant part. */ | |
8cd28148 | 7107 | variant_part = Variant_Part (gnat_component_list); |
a1ab4c31 AC |
7108 | |
7109 | /* We create a QUAL_UNION_TYPE for the variant part since the variants are | |
7110 | mutually exclusive and should go in the same memory. To do this we need | |
7111 | to treat each variant as a record whose elements are created from the | |
7112 | component list for the variant. So here we create the records from the | |
7113 | lists for the variants and put them all into the QUAL_UNION_TYPE. | |
7114 | If this is an Unchecked_Union, we make a UNION_TYPE instead or | |
7115 | use GNU_RECORD_TYPE if there are no fields so far. */ | |
7116 | if (Present (variant_part)) | |
7117 | { | |
0fb2335d EB |
7118 | Node_Id gnat_discr = Name (variant_part), variant; |
7119 | tree gnu_discr = gnat_to_gnu (gnat_discr); | |
a1ab4c31 AC |
7120 | tree gnu_name = TYPE_NAME (gnu_record_type); |
7121 | tree gnu_var_name | |
0fb2335d EB |
7122 | = concat_name (get_identifier (Get_Name_String (Chars (gnat_discr))), |
7123 | "XVN"); | |
ef0feeb2 | 7124 | tree gnu_union_type, gnu_union_name; |
a1ab4c31 AC |
7125 | tree gnu_variant_list = NULL_TREE; |
7126 | ||
7127 | if (TREE_CODE (gnu_name) == TYPE_DECL) | |
7128 | gnu_name = DECL_NAME (gnu_name); | |
7129 | ||
0fb2335d EB |
7130 | gnu_union_name |
7131 | = concat_name (gnu_name, IDENTIFIER_POINTER (gnu_var_name)); | |
a1ab4c31 AC |
7132 | |
7133 | /* Reuse an enclosing union if all fields are in the variant part | |
7134 | and there is no representation clause on the record, to match | |
7135 | the layout of C unions. There is an associated check below. */ | |
7136 | if (!gnu_field_list | |
7137 | && TREE_CODE (gnu_record_type) == UNION_TYPE | |
7138 | && !TYPE_PACKED (gnu_record_type)) | |
7139 | gnu_union_type = gnu_record_type; | |
7140 | else | |
7141 | { | |
7142 | gnu_union_type | |
7143 | = make_node (unchecked_union ? UNION_TYPE : QUAL_UNION_TYPE); | |
7144 | ||
7145 | TYPE_NAME (gnu_union_type) = gnu_union_name; | |
7146 | TYPE_ALIGN (gnu_union_type) = 0; | |
7147 | TYPE_PACKED (gnu_union_type) = TYPE_PACKED (gnu_record_type); | |
7148 | } | |
7149 | ||
7150 | for (variant = First_Non_Pragma (Variants (variant_part)); | |
7151 | Present (variant); | |
7152 | variant = Next_Non_Pragma (variant)) | |
7153 | { | |
7154 | tree gnu_variant_type = make_node (RECORD_TYPE); | |
7155 | tree gnu_inner_name; | |
7156 | tree gnu_qual; | |
7157 | ||
7158 | Get_Variant_Encoding (variant); | |
0fb2335d | 7159 | gnu_inner_name = get_identifier_with_length (Name_Buffer, Name_Len); |
a1ab4c31 | 7160 | TYPE_NAME (gnu_variant_type) |
0fb2335d EB |
7161 | = concat_name (gnu_union_name, |
7162 | IDENTIFIER_POINTER (gnu_inner_name)); | |
a1ab4c31 AC |
7163 | |
7164 | /* Set the alignment of the inner type in case we need to make | |
8cd28148 EB |
7165 | inner objects into bitfields, but then clear it out so the |
7166 | record actually gets only the alignment required. */ | |
a1ab4c31 AC |
7167 | TYPE_ALIGN (gnu_variant_type) = TYPE_ALIGN (gnu_record_type); |
7168 | TYPE_PACKED (gnu_variant_type) = TYPE_PACKED (gnu_record_type); | |
7169 | ||
8cd28148 EB |
7170 | /* Similarly, if the outer record has a size specified and all |
7171 | fields have record rep clauses, we can propagate the size | |
7172 | into the variant part. */ | |
a1ab4c31 AC |
7173 | if (all_rep_and_size) |
7174 | { | |
7175 | TYPE_SIZE (gnu_variant_type) = TYPE_SIZE (gnu_record_type); | |
7176 | TYPE_SIZE_UNIT (gnu_variant_type) | |
7177 | = TYPE_SIZE_UNIT (gnu_record_type); | |
7178 | } | |
7179 | ||
032d1b71 EB |
7180 | /* Add the fields into the record type for the variant. Note that |
7181 | we aren't sure to really use it at this point, see below. */ | |
a1ab4c31 AC |
7182 | components_to_record (gnu_variant_type, Component_List (variant), |
7183 | NULL_TREE, packed, definition, | |
ef0feeb2 EB |
7184 | !all_rep_and_size, all_rep, |
7185 | unchecked_union, debug_info, | |
7186 | true, reorder, &gnu_rep_list); | |
a1ab4c31 | 7187 | |
0fb2335d | 7188 | gnu_qual = choices_to_gnu (gnu_discr, Discrete_Choices (variant)); |
a1ab4c31 AC |
7189 | |
7190 | Set_Present_Expr (variant, annotate_value (gnu_qual)); | |
7191 | ||
7192 | /* If this is an Unchecked_Union and we have exactly one field, | |
7193 | use this field directly to match the layout of C unions. */ | |
7194 | if (unchecked_union | |
7195 | && TYPE_FIELDS (gnu_variant_type) | |
910ad8de | 7196 | && !DECL_CHAIN (TYPE_FIELDS (gnu_variant_type))) |
a1ab4c31 AC |
7197 | gnu_field = TYPE_FIELDS (gnu_variant_type); |
7198 | else | |
7199 | { | |
7200 | /* Deal with packedness like in gnat_to_gnu_field. */ | |
7201 | int field_packed | |
7202 | = adjust_packed (gnu_variant_type, gnu_record_type, packed); | |
7203 | ||
7204 | /* Finalize the record type now. We used to throw away | |
7205 | empty records but we no longer do that because we need | |
7206 | them to generate complete debug info for the variant; | |
7207 | otherwise, the union type definition will be lacking | |
7208 | the fields associated with these empty variants. */ | |
7209 | rest_of_record_type_compilation (gnu_variant_type); | |
95c1c4bb | 7210 | create_type_decl (TYPE_NAME (gnu_variant_type), gnu_variant_type, |
ef0feeb2 | 7211 | NULL, true, debug_info, gnat_component_list); |
a1ab4c31 | 7212 | |
da01bfee EB |
7213 | gnu_field |
7214 | = create_field_decl (gnu_inner_name, gnu_variant_type, | |
7215 | gnu_union_type, | |
7216 | all_rep_and_size | |
7217 | ? TYPE_SIZE (gnu_variant_type) : 0, | |
7218 | all_rep_and_size | |
7219 | ? bitsize_zero_node : 0, | |
7220 | field_packed, 0); | |
a1ab4c31 AC |
7221 | |
7222 | DECL_INTERNAL_P (gnu_field) = 1; | |
7223 | ||
7224 | if (!unchecked_union) | |
7225 | DECL_QUALIFIER (gnu_field) = gnu_qual; | |
7226 | } | |
7227 | ||
910ad8de | 7228 | DECL_CHAIN (gnu_field) = gnu_variant_list; |
a1ab4c31 AC |
7229 | gnu_variant_list = gnu_field; |
7230 | } | |
7231 | ||
8cd28148 | 7232 | /* Only make the QUAL_UNION_TYPE if there are non-empty variants. */ |
a1ab4c31 AC |
7233 | if (gnu_variant_list) |
7234 | { | |
7235 | int union_field_packed; | |
7236 | ||
7237 | if (all_rep_and_size) | |
7238 | { | |
7239 | TYPE_SIZE (gnu_union_type) = TYPE_SIZE (gnu_record_type); | |
7240 | TYPE_SIZE_UNIT (gnu_union_type) | |
7241 | = TYPE_SIZE_UNIT (gnu_record_type); | |
7242 | } | |
7243 | ||
7244 | finish_record_type (gnu_union_type, nreverse (gnu_variant_list), | |
ef0feeb2 | 7245 | all_rep_and_size ? 1 : 0, debug_info); |
a1ab4c31 AC |
7246 | |
7247 | /* If GNU_UNION_TYPE is our record type, it means we must have an | |
7248 | Unchecked_Union with no fields. Verify that and, if so, just | |
7249 | return. */ | |
7250 | if (gnu_union_type == gnu_record_type) | |
7251 | { | |
7252 | gcc_assert (unchecked_union | |
7253 | && !gnu_field_list | |
ef0feeb2 | 7254 | && !gnu_rep_list); |
a1ab4c31 AC |
7255 | return; |
7256 | } | |
7257 | ||
95c1c4bb | 7258 | create_type_decl (TYPE_NAME (gnu_union_type), gnu_union_type, |
ef0feeb2 | 7259 | NULL, true, debug_info, gnat_component_list); |
95c1c4bb | 7260 | |
a1ab4c31 AC |
7261 | /* Deal with packedness like in gnat_to_gnu_field. */ |
7262 | union_field_packed | |
7263 | = adjust_packed (gnu_union_type, gnu_record_type, packed); | |
7264 | ||
ef0feeb2 | 7265 | gnu_variant_part |
a1ab4c31 | 7266 | = create_field_decl (gnu_var_name, gnu_union_type, gnu_record_type, |
a1ab4c31 | 7267 | all_rep ? TYPE_SIZE (gnu_union_type) : 0, |
da01bfee EB |
7268 | all_rep ? bitsize_zero_node : 0, |
7269 | union_field_packed, 0); | |
a1ab4c31 | 7270 | |
ef0feeb2 EB |
7271 | DECL_INTERNAL_P (gnu_variant_part) = 1; |
7272 | DECL_CHAIN (gnu_variant_part) = gnu_field_list; | |
7273 | gnu_field_list = gnu_variant_part; | |
a1ab4c31 AC |
7274 | } |
7275 | } | |
7276 | ||
ef0feeb2 EB |
7277 | /* Scan GNU_FIELD_LIST and see if any fields have rep clauses and, if we are |
7278 | permitted to reorder components, self-referential sizes or variable sizes. | |
7279 | If they do, pull them out and put them onto the appropriate list. We have | |
7280 | to do this in a separate pass since we want to handle the discriminants | |
7281 | but can't play with them until we've used them in debugging data above. | |
8cd28148 | 7282 | |
ef0feeb2 EB |
7283 | ??? If we reorder them, debugging information will be wrong but there is |
7284 | nothing that can be done about this at the moment. */ | |
8cd28148 | 7285 | gnu_last = NULL_TREE; |
ef0feeb2 EB |
7286 | |
7287 | #define MOVE_FROM_FIELD_LIST_TO(LIST) \ | |
7288 | do { \ | |
7289 | if (gnu_last) \ | |
7290 | DECL_CHAIN (gnu_last) = gnu_next; \ | |
7291 | else \ | |
7292 | gnu_field_list = gnu_next; \ | |
7293 | \ | |
7294 | DECL_CHAIN (gnu_field) = (LIST); \ | |
7295 | (LIST) = gnu_field; \ | |
7296 | } while (0) | |
7297 | ||
8cd28148 | 7298 | for (gnu_field = gnu_field_list; gnu_field; gnu_field = gnu_next) |
a1ab4c31 | 7299 | { |
910ad8de | 7300 | gnu_next = DECL_CHAIN (gnu_field); |
8cd28148 | 7301 | |
a1ab4c31 AC |
7302 | if (DECL_FIELD_OFFSET (gnu_field)) |
7303 | { | |
ef0feeb2 EB |
7304 | MOVE_FROM_FIELD_LIST_TO (gnu_rep_list); |
7305 | continue; | |
7306 | } | |
7307 | ||
7308 | if (reorder) | |
7309 | { | |
7310 | /* Pull out the variant part and put it onto GNU_SELF_LIST. */ | |
7311 | if (gnu_field == gnu_variant_part) | |
7312 | { | |
7313 | MOVE_FROM_FIELD_LIST_TO (gnu_self_list); | |
7314 | continue; | |
7315 | } | |
a1ab4c31 | 7316 | |
ef0feeb2 EB |
7317 | /* Skip internal fields and fields with fixed size. */ |
7318 | if (!DECL_INTERNAL_P (gnu_field) | |
7319 | && !(DECL_SIZE (gnu_field) | |
7320 | && TREE_CODE (DECL_SIZE (gnu_field)) == INTEGER_CST)) | |
7321 | { | |
7322 | tree type_size = TYPE_SIZE (TREE_TYPE (gnu_field)); | |
7323 | ||
7324 | if (CONTAINS_PLACEHOLDER_P (type_size)) | |
7325 | { | |
7326 | MOVE_FROM_FIELD_LIST_TO (gnu_self_list); | |
7327 | continue; | |
7328 | } | |
7329 | ||
7330 | if (TREE_CODE (type_size) != INTEGER_CST) | |
7331 | { | |
7332 | MOVE_FROM_FIELD_LIST_TO (gnu_var_list); | |
7333 | continue; | |
7334 | } | |
7335 | } | |
a1ab4c31 | 7336 | } |
ef0feeb2 EB |
7337 | |
7338 | gnu_last = gnu_field; | |
a1ab4c31 AC |
7339 | } |
7340 | ||
ef0feeb2 EB |
7341 | #undef MOVE_FROM_FIELD_LIST_TO |
7342 | ||
7343 | /* If permitted, we reorder the components as follows: | |
7344 | ||
7345 | 1) all fixed length fields, | |
7346 | 2) all fields whose length doesn't depend on discriminants, | |
7347 | 3) all fields whose length depends on discriminants, | |
7348 | 4) the variant part, | |
7349 | ||
7350 | within the record and within each variant recursively. */ | |
7351 | if (reorder) | |
7352 | gnu_field_list | |
7353 | = chainon (nreverse (gnu_self_list), | |
7354 | chainon (nreverse (gnu_var_list), gnu_field_list)); | |
7355 | ||
8cd28148 EB |
7356 | /* If we have any fields in our rep'ed field list and it is not the case that |
7357 | all the fields in the record have rep clauses and P_REP_LIST is nonzero, | |
7358 | set it and ignore these fields. */ | |
ef0feeb2 EB |
7359 | if (gnu_rep_list && p_gnu_rep_list && !all_rep) |
7360 | *p_gnu_rep_list = chainon (*p_gnu_rep_list, gnu_rep_list); | |
8cd28148 EB |
7361 | |
7362 | /* Otherwise, sort the fields by bit position and put them into their own | |
7363 | record, before the others, if we also have fields without rep clauses. */ | |
ef0feeb2 | 7364 | else if (gnu_rep_list) |
a1ab4c31 | 7365 | { |
a1ab4c31 AC |
7366 | tree gnu_rep_type |
7367 | = (gnu_field_list ? make_node (RECORD_TYPE) : gnu_record_type); | |
ef0feeb2 | 7368 | int i, len = list_length (gnu_rep_list); |
2bb1fc26 | 7369 | tree *gnu_arr = XALLOCAVEC (tree, len); |
a1ab4c31 | 7370 | |
ef0feeb2 | 7371 | for (gnu_field = gnu_rep_list, i = 0; |
8cd28148 | 7372 | gnu_field; |
910ad8de | 7373 | gnu_field = DECL_CHAIN (gnu_field), i++) |
a1ab4c31 AC |
7374 | gnu_arr[i] = gnu_field; |
7375 | ||
7376 | qsort (gnu_arr, len, sizeof (tree), compare_field_bitpos); | |
7377 | ||
7378 | /* Put the fields in the list in order of increasing position, which | |
7379 | means we start from the end. */ | |
ef0feeb2 | 7380 | gnu_rep_list = NULL_TREE; |
a1ab4c31 AC |
7381 | for (i = len - 1; i >= 0; i--) |
7382 | { | |
ef0feeb2 EB |
7383 | DECL_CHAIN (gnu_arr[i]) = gnu_rep_list; |
7384 | gnu_rep_list = gnu_arr[i]; | |
a1ab4c31 AC |
7385 | DECL_CONTEXT (gnu_arr[i]) = gnu_rep_type; |
7386 | } | |
7387 | ||
7388 | if (gnu_field_list) | |
7389 | { | |
ef0feeb2 | 7390 | finish_record_type (gnu_rep_type, gnu_rep_list, 1, debug_info); |
8cd28148 EB |
7391 | gnu_field |
7392 | = create_field_decl (get_identifier ("REP"), gnu_rep_type, | |
da01bfee | 7393 | gnu_record_type, NULL_TREE, NULL_TREE, 0, 1); |
a1ab4c31 AC |
7394 | DECL_INTERNAL_P (gnu_field) = 1; |
7395 | gnu_field_list = chainon (gnu_field_list, gnu_field); | |
7396 | } | |
7397 | else | |
7398 | { | |
7399 | layout_with_rep = true; | |
ef0feeb2 | 7400 | gnu_field_list = nreverse (gnu_rep_list); |
a1ab4c31 AC |
7401 | } |
7402 | } | |
7403 | ||
7404 | if (cancel_alignment) | |
7405 | TYPE_ALIGN (gnu_record_type) = 0; | |
7406 | ||
7407 | finish_record_type (gnu_record_type, nreverse (gnu_field_list), | |
ef0feeb2 | 7408 | layout_with_rep ? 1 : 0, debug_info && !maybe_unused); |
a1ab4c31 AC |
7409 | } |
7410 | \f | |
7411 | /* Given GNU_SIZE, a GCC tree representing a size, return a Uint to be | |
7412 | placed into an Esize, Component_Bit_Offset, or Component_Size value | |
7413 | in the GNAT tree. */ | |
7414 | ||
7415 | static Uint | |
7416 | annotate_value (tree gnu_size) | |
7417 | { | |
a1ab4c31 AC |
7418 | TCode tcode; |
7419 | Node_Ref_Or_Val ops[3], ret; | |
a1ab4c31 | 7420 | struct tree_int_map **h = NULL; |
586388fd | 7421 | int i; |
a1ab4c31 AC |
7422 | |
7423 | /* See if we've already saved the value for this node. */ | |
7424 | if (EXPR_P (gnu_size)) | |
7425 | { | |
7426 | struct tree_int_map in; | |
7427 | if (!annotate_value_cache) | |
7428 | annotate_value_cache = htab_create_ggc (512, tree_int_map_hash, | |
7429 | tree_int_map_eq, 0); | |
7430 | in.base.from = gnu_size; | |
7431 | h = (struct tree_int_map **) | |
7432 | htab_find_slot (annotate_value_cache, &in, INSERT); | |
7433 | ||
7434 | if (*h) | |
7435 | return (Node_Ref_Or_Val) (*h)->to; | |
7436 | } | |
7437 | ||
7438 | /* If we do not return inside this switch, TCODE will be set to the | |
7439 | code to use for a Create_Node operand and LEN (set above) will be | |
7440 | the number of recursive calls for us to make. */ | |
7441 | ||
7442 | switch (TREE_CODE (gnu_size)) | |
7443 | { | |
7444 | case INTEGER_CST: | |
7445 | if (TREE_OVERFLOW (gnu_size)) | |
7446 | return No_Uint; | |
7447 | ||
1081f5a7 EB |
7448 | /* This may come from a conversion from some smaller type, so ensure |
7449 | this is in bitsizetype. */ | |
a1ab4c31 AC |
7450 | gnu_size = convert (bitsizetype, gnu_size); |
7451 | ||
728936bb EB |
7452 | /* For a negative value, build NEGATE_EXPR of the opposite. Such values |
7453 | appear in expressions containing aligning patterns. Note that, since | |
7454 | sizetype is sign-extended but nonetheless unsigned, we don't directly | |
7455 | use tree_int_cst_sgn. */ | |
7456 | if (TREE_INT_CST_HIGH (gnu_size) < 0) | |
a1ab4c31 | 7457 | { |
1081f5a7 EB |
7458 | tree op_size = fold_build1 (NEGATE_EXPR, bitsizetype, gnu_size); |
7459 | return annotate_value (build1 (NEGATE_EXPR, bitsizetype, op_size)); | |
a1ab4c31 AC |
7460 | } |
7461 | ||
586388fd | 7462 | return UI_From_gnu (gnu_size); |
a1ab4c31 AC |
7463 | |
7464 | case COMPONENT_REF: | |
7465 | /* The only case we handle here is a simple discriminant reference. */ | |
7466 | if (TREE_CODE (TREE_OPERAND (gnu_size, 0)) == PLACEHOLDER_EXPR | |
7467 | && TREE_CODE (TREE_OPERAND (gnu_size, 1)) == FIELD_DECL | |
7468 | && DECL_DISCRIMINANT_NUMBER (TREE_OPERAND (gnu_size, 1))) | |
7469 | return Create_Node (Discrim_Val, | |
7470 | annotate_value (DECL_DISCRIMINANT_NUMBER | |
7471 | (TREE_OPERAND (gnu_size, 1))), | |
7472 | No_Uint, No_Uint); | |
7473 | else | |
7474 | return No_Uint; | |
7475 | ||
7476 | CASE_CONVERT: case NON_LVALUE_EXPR: | |
7477 | return annotate_value (TREE_OPERAND (gnu_size, 0)); | |
7478 | ||
7479 | /* Now just list the operations we handle. */ | |
7480 | case COND_EXPR: tcode = Cond_Expr; break; | |
7481 | case PLUS_EXPR: tcode = Plus_Expr; break; | |
7482 | case MINUS_EXPR: tcode = Minus_Expr; break; | |
7483 | case MULT_EXPR: tcode = Mult_Expr; break; | |
7484 | case TRUNC_DIV_EXPR: tcode = Trunc_Div_Expr; break; | |
7485 | case CEIL_DIV_EXPR: tcode = Ceil_Div_Expr; break; | |
7486 | case FLOOR_DIV_EXPR: tcode = Floor_Div_Expr; break; | |
7487 | case TRUNC_MOD_EXPR: tcode = Trunc_Mod_Expr; break; | |
7488 | case CEIL_MOD_EXPR: tcode = Ceil_Mod_Expr; break; | |
7489 | case FLOOR_MOD_EXPR: tcode = Floor_Mod_Expr; break; | |
7490 | case EXACT_DIV_EXPR: tcode = Exact_Div_Expr; break; | |
7491 | case NEGATE_EXPR: tcode = Negate_Expr; break; | |
7492 | case MIN_EXPR: tcode = Min_Expr; break; | |
7493 | case MAX_EXPR: tcode = Max_Expr; break; | |
7494 | case ABS_EXPR: tcode = Abs_Expr; break; | |
7495 | case TRUTH_ANDIF_EXPR: tcode = Truth_Andif_Expr; break; | |
7496 | case TRUTH_ORIF_EXPR: tcode = Truth_Orif_Expr; break; | |
7497 | case TRUTH_AND_EXPR: tcode = Truth_And_Expr; break; | |
7498 | case TRUTH_OR_EXPR: tcode = Truth_Or_Expr; break; | |
7499 | case TRUTH_XOR_EXPR: tcode = Truth_Xor_Expr; break; | |
7500 | case TRUTH_NOT_EXPR: tcode = Truth_Not_Expr; break; | |
7501 | case BIT_AND_EXPR: tcode = Bit_And_Expr; break; | |
7502 | case LT_EXPR: tcode = Lt_Expr; break; | |
7503 | case LE_EXPR: tcode = Le_Expr; break; | |
7504 | case GT_EXPR: tcode = Gt_Expr; break; | |
7505 | case GE_EXPR: tcode = Ge_Expr; break; | |
7506 | case EQ_EXPR: tcode = Eq_Expr; break; | |
7507 | case NE_EXPR: tcode = Ne_Expr; break; | |
7508 | ||
f82a627c EB |
7509 | case CALL_EXPR: |
7510 | { | |
7511 | tree t = maybe_inline_call_in_expr (gnu_size); | |
7512 | if (t) | |
7513 | return annotate_value (t); | |
7514 | } | |
7515 | ||
7516 | /* Fall through... */ | |
7517 | ||
a1ab4c31 AC |
7518 | default: |
7519 | return No_Uint; | |
7520 | } | |
7521 | ||
7522 | /* Now get each of the operands that's relevant for this code. If any | |
7523 | cannot be expressed as a repinfo node, say we can't. */ | |
7524 | for (i = 0; i < 3; i++) | |
7525 | ops[i] = No_Uint; | |
7526 | ||
58c8f770 | 7527 | for (i = 0; i < TREE_CODE_LENGTH (TREE_CODE (gnu_size)); i++) |
a1ab4c31 AC |
7528 | { |
7529 | ops[i] = annotate_value (TREE_OPERAND (gnu_size, i)); | |
7530 | if (ops[i] == No_Uint) | |
7531 | return No_Uint; | |
7532 | } | |
7533 | ||
7534 | ret = Create_Node (tcode, ops[0], ops[1], ops[2]); | |
7535 | ||
7536 | /* Save the result in the cache. */ | |
7537 | if (h) | |
7538 | { | |
a9429e29 | 7539 | *h = ggc_alloc_tree_int_map (); |
a1ab4c31 AC |
7540 | (*h)->base.from = gnu_size; |
7541 | (*h)->to = ret; | |
7542 | } | |
7543 | ||
7544 | return ret; | |
7545 | } | |
7546 | ||
f4cd2542 EB |
7547 | /* Given GNAT_ENTITY, an object (constant, variable, parameter, exception) |
7548 | and GNU_TYPE, its corresponding GCC type, set Esize and Alignment to the | |
7549 | size and alignment used by Gigi. Prefer SIZE over TYPE_SIZE if non-null. | |
0c700259 EB |
7550 | BY_REF is true if the object is used by reference and BY_DOUBLE_REF is |
7551 | true if the object is used by double reference. */ | |
f4cd2542 EB |
7552 | |
7553 | void | |
0c700259 EB |
7554 | annotate_object (Entity_Id gnat_entity, tree gnu_type, tree size, bool by_ref, |
7555 | bool by_double_ref) | |
f4cd2542 EB |
7556 | { |
7557 | if (by_ref) | |
7558 | { | |
0c700259 EB |
7559 | if (by_double_ref) |
7560 | gnu_type = TREE_TYPE (gnu_type); | |
7561 | ||
315cff15 | 7562 | if (TYPE_IS_FAT_POINTER_P (gnu_type)) |
f4cd2542 EB |
7563 | gnu_type = TYPE_UNCONSTRAINED_ARRAY (gnu_type); |
7564 | else | |
7565 | gnu_type = TREE_TYPE (gnu_type); | |
7566 | } | |
7567 | ||
7568 | if (Unknown_Esize (gnat_entity)) | |
7569 | { | |
7570 | if (TREE_CODE (gnu_type) == RECORD_TYPE | |
7571 | && TYPE_CONTAINS_TEMPLATE_P (gnu_type)) | |
910ad8de | 7572 | size = TYPE_SIZE (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (gnu_type)))); |
f4cd2542 EB |
7573 | else if (!size) |
7574 | size = TYPE_SIZE (gnu_type); | |
7575 | ||
7576 | if (size) | |
7577 | Set_Esize (gnat_entity, annotate_value (size)); | |
7578 | } | |
7579 | ||
7580 | if (Unknown_Alignment (gnat_entity)) | |
7581 | Set_Alignment (gnat_entity, | |
7582 | UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT)); | |
7583 | } | |
7584 | ||
cb3d597d EB |
7585 | /* Return first element of field list whose TREE_PURPOSE is the same as ELEM. |
7586 | Return NULL_TREE if there is no such element in the list. */ | |
73d28034 EB |
7587 | |
7588 | static tree | |
7589 | purpose_member_field (const_tree elem, tree list) | |
7590 | { | |
7591 | while (list) | |
7592 | { | |
7593 | tree field = TREE_PURPOSE (list); | |
cb3d597d | 7594 | if (SAME_FIELD_P (field, elem)) |
73d28034 EB |
7595 | return list; |
7596 | list = TREE_CHAIN (list); | |
7597 | } | |
7598 | return NULL_TREE; | |
7599 | } | |
7600 | ||
3f13dd77 EB |
7601 | /* Given GNAT_ENTITY, a record type, and GNU_TYPE, its corresponding GCC type, |
7602 | set Component_Bit_Offset and Esize of the components to the position and | |
7603 | size used by Gigi. */ | |
a1ab4c31 AC |
7604 | |
7605 | static void | |
7606 | annotate_rep (Entity_Id gnat_entity, tree gnu_type) | |
7607 | { | |
a1ab4c31 | 7608 | Entity_Id gnat_field; |
3f13dd77 | 7609 | tree gnu_list; |
a1ab4c31 | 7610 | |
3f13dd77 EB |
7611 | /* We operate by first making a list of all fields and their position (we |
7612 | can get the size easily) and then update all the sizes in the tree. */ | |
95c1c4bb EB |
7613 | gnu_list |
7614 | = build_position_list (gnu_type, false, size_zero_node, bitsize_zero_node, | |
7615 | BIGGEST_ALIGNMENT, NULL_TREE); | |
a1ab4c31 | 7616 | |
3f13dd77 EB |
7617 | for (gnat_field = First_Entity (gnat_entity); |
7618 | Present (gnat_field); | |
a1ab4c31 | 7619 | gnat_field = Next_Entity (gnat_field)) |
3f13dd77 EB |
7620 | if (Ekind (gnat_field) == E_Component |
7621 | || (Ekind (gnat_field) == E_Discriminant | |
7622 | && !Is_Unchecked_Union (Scope (gnat_field)))) | |
a1ab4c31 | 7623 | { |
73d28034 EB |
7624 | tree t = purpose_member_field (gnat_to_gnu_field_decl (gnat_field), |
7625 | gnu_list); | |
3f13dd77 | 7626 | if (t) |
a1ab4c31 | 7627 | { |
73d28034 EB |
7628 | tree parent_offset; |
7629 | ||
a1ab4c31 AC |
7630 | if (type_annotate_only && Is_Tagged_Type (gnat_entity)) |
7631 | { | |
3f13dd77 | 7632 | /* In this mode the tag and parent components are not |
a1ab4c31 AC |
7633 | generated, so we add the appropriate offset to each |
7634 | component. For a component appearing in the current | |
7635 | extension, the offset is the size of the parent. */ | |
3f13dd77 EB |
7636 | if (Is_Derived_Type (gnat_entity) |
7637 | && Original_Record_Component (gnat_field) == gnat_field) | |
7638 | parent_offset | |
7639 | = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))), | |
7640 | bitsizetype); | |
7641 | else | |
7642 | parent_offset = bitsize_int (POINTER_SIZE); | |
a1ab4c31 | 7643 | } |
3f13dd77 EB |
7644 | else |
7645 | parent_offset = bitsize_zero_node; | |
a1ab4c31 | 7646 | |
3f13dd77 EB |
7647 | Set_Component_Bit_Offset |
7648 | (gnat_field, | |
7649 | annotate_value | |
7650 | (size_binop (PLUS_EXPR, | |
95c1c4bb EB |
7651 | bit_from_pos (TREE_VEC_ELT (TREE_VALUE (t), 0), |
7652 | TREE_VEC_ELT (TREE_VALUE (t), 2)), | |
3f13dd77 | 7653 | parent_offset))); |
a1ab4c31 AC |
7654 | |
7655 | Set_Esize (gnat_field, | |
3f13dd77 | 7656 | annotate_value (DECL_SIZE (TREE_PURPOSE (t)))); |
a1ab4c31 | 7657 | } |
3f13dd77 | 7658 | else if (Is_Tagged_Type (gnat_entity) && Is_Derived_Type (gnat_entity)) |
a1ab4c31 | 7659 | { |
3f13dd77 | 7660 | /* If there is no entry, this is an inherited component whose |
a1ab4c31 AC |
7661 | position is the same as in the parent type. */ |
7662 | Set_Component_Bit_Offset | |
7663 | (gnat_field, | |
7664 | Component_Bit_Offset (Original_Record_Component (gnat_field))); | |
3f13dd77 | 7665 | |
a1ab4c31 AC |
7666 | Set_Esize (gnat_field, |
7667 | Esize (Original_Record_Component (gnat_field))); | |
7668 | } | |
7669 | } | |
7670 | } | |
3f13dd77 | 7671 | \f |
95c1c4bb EB |
7672 | /* Scan all fields in GNU_TYPE and return a TREE_LIST where TREE_PURPOSE is |
7673 | the FIELD_DECL and TREE_VALUE a TREE_VEC containing the byte position, the | |
7674 | value to be placed into DECL_OFFSET_ALIGN and the bit position. The list | |
7675 | of fields is flattened, except for variant parts if DO_NOT_FLATTEN_VARIANT | |
7676 | is set to true. GNU_POS is to be added to the position, GNU_BITPOS to the | |
7677 | bit position, OFFSET_ALIGN is the present offset alignment. GNU_LIST is a | |
7678 | pre-existing list to be chained to the newly created entries. */ | |
a1ab4c31 AC |
7679 | |
7680 | static tree | |
95c1c4bb EB |
7681 | build_position_list (tree gnu_type, bool do_not_flatten_variant, tree gnu_pos, |
7682 | tree gnu_bitpos, unsigned int offset_align, tree gnu_list) | |
a1ab4c31 AC |
7683 | { |
7684 | tree gnu_field; | |
a1ab4c31 | 7685 | |
3f13dd77 EB |
7686 | for (gnu_field = TYPE_FIELDS (gnu_type); |
7687 | gnu_field; | |
910ad8de | 7688 | gnu_field = DECL_CHAIN (gnu_field)) |
a1ab4c31 AC |
7689 | { |
7690 | tree gnu_our_bitpos = size_binop (PLUS_EXPR, gnu_bitpos, | |
7691 | DECL_FIELD_BIT_OFFSET (gnu_field)); | |
7692 | tree gnu_our_offset = size_binop (PLUS_EXPR, gnu_pos, | |
7693 | DECL_FIELD_OFFSET (gnu_field)); | |
7694 | unsigned int our_offset_align | |
7695 | = MIN (offset_align, DECL_OFFSET_ALIGN (gnu_field)); | |
95c1c4bb | 7696 | tree v = make_tree_vec (3); |
a1ab4c31 | 7697 | |
95c1c4bb EB |
7698 | TREE_VEC_ELT (v, 0) = gnu_our_offset; |
7699 | TREE_VEC_ELT (v, 1) = size_int (our_offset_align); | |
7700 | TREE_VEC_ELT (v, 2) = gnu_our_bitpos; | |
7701 | gnu_list = tree_cons (gnu_field, v, gnu_list); | |
a1ab4c31 | 7702 | |
95c1c4bb EB |
7703 | /* Recurse on internal fields, flattening the nested fields except for |
7704 | those in the variant part, if requested. */ | |
a1ab4c31 | 7705 | if (DECL_INTERNAL_P (gnu_field)) |
95c1c4bb EB |
7706 | { |
7707 | tree gnu_field_type = TREE_TYPE (gnu_field); | |
7708 | if (do_not_flatten_variant | |
7709 | && TREE_CODE (gnu_field_type) == QUAL_UNION_TYPE) | |
7710 | gnu_list | |
7711 | = build_position_list (gnu_field_type, do_not_flatten_variant, | |
7712 | size_zero_node, bitsize_zero_node, | |
7713 | BIGGEST_ALIGNMENT, gnu_list); | |
7714 | else | |
7715 | gnu_list | |
7716 | = build_position_list (gnu_field_type, do_not_flatten_variant, | |
a1ab4c31 | 7717 | gnu_our_offset, gnu_our_bitpos, |
95c1c4bb EB |
7718 | our_offset_align, gnu_list); |
7719 | } | |
7720 | } | |
7721 | ||
7722 | return gnu_list; | |
7723 | } | |
7724 | ||
e3554601 | 7725 | /* Return a VEC describing the substitutions needed to reflect the |
95c1c4bb | 7726 | discriminant substitutions from GNAT_TYPE to GNAT_SUBTYPE. They can |
e3554601 NF |
7727 | be in any order. The values in an element of the VEC are in the form |
7728 | of operands to SUBSTITUTE_IN_EXPR. DEFINITION is true if this is for | |
7729 | a definition of GNAT_SUBTYPE. */ | |
95c1c4bb | 7730 | |
e3554601 | 7731 | static VEC(subst_pair,heap) * |
95c1c4bb EB |
7732 | build_subst_list (Entity_Id gnat_subtype, Entity_Id gnat_type, bool definition) |
7733 | { | |
e3554601 | 7734 | VEC(subst_pair,heap) *gnu_vec = NULL; |
95c1c4bb EB |
7735 | Entity_Id gnat_discrim; |
7736 | Node_Id gnat_value; | |
7737 | ||
7738 | for (gnat_discrim = First_Stored_Discriminant (gnat_type), | |
7739 | gnat_value = First_Elmt (Stored_Constraint (gnat_subtype)); | |
7740 | Present (gnat_discrim); | |
7741 | gnat_discrim = Next_Stored_Discriminant (gnat_discrim), | |
7742 | gnat_value = Next_Elmt (gnat_value)) | |
7743 | /* Ignore access discriminants. */ | |
7744 | if (!Is_Access_Type (Etype (Node (gnat_value)))) | |
3c28a5f4 EB |
7745 | { |
7746 | tree gnu_field = gnat_to_gnu_field_decl (gnat_discrim); | |
e3554601 NF |
7747 | tree replacement = convert (TREE_TYPE (gnu_field), |
7748 | elaborate_expression | |
7749 | (Node (gnat_value), gnat_subtype, | |
7750 | get_entity_name (gnat_discrim), | |
7751 | definition, true, false)); | |
7752 | subst_pair *s = VEC_safe_push (subst_pair, heap, gnu_vec, NULL); | |
7753 | s->discriminant = gnu_field; | |
7754 | s->replacement = replacement; | |
3c28a5f4 | 7755 | } |
95c1c4bb | 7756 | |
e3554601 | 7757 | return gnu_vec; |
95c1c4bb EB |
7758 | } |
7759 | ||
fb7fb701 NF |
7760 | /* Scan all fields in QUAL_UNION_TYPE and return a VEC describing the |
7761 | variants of QUAL_UNION_TYPE that are still relevant after applying | |
7762 | the substitutions described in SUBST_LIST. VARIANT_LIST is a | |
7763 | pre-existing VEC onto which newly created entries should be | |
7764 | pushed. */ | |
95c1c4bb | 7765 | |
fb7fb701 | 7766 | static VEC(variant_desc,heap) * |
e3554601 | 7767 | build_variant_list (tree qual_union_type, VEC(subst_pair,heap) *subst_list, |
fb7fb701 | 7768 | VEC(variant_desc,heap) *variant_list) |
95c1c4bb EB |
7769 | { |
7770 | tree gnu_field; | |
7771 | ||
7772 | for (gnu_field = TYPE_FIELDS (qual_union_type); | |
7773 | gnu_field; | |
910ad8de | 7774 | gnu_field = DECL_CHAIN (gnu_field)) |
95c1c4bb | 7775 | { |
e3554601 NF |
7776 | tree qual = DECL_QUALIFIER (gnu_field); |
7777 | unsigned ix; | |
7778 | subst_pair *s; | |
95c1c4bb | 7779 | |
e3554601 NF |
7780 | FOR_EACH_VEC_ELT_REVERSE (subst_pair, subst_list, ix, s) |
7781 | qual = SUBSTITUTE_IN_EXPR (qual, s->discriminant, s->replacement); | |
95c1c4bb EB |
7782 | |
7783 | /* If the new qualifier is not unconditionally false, its variant may | |
7784 | still be accessed. */ | |
7785 | if (!integer_zerop (qual)) | |
7786 | { | |
fb7fb701 | 7787 | variant_desc *v; |
95c1c4bb | 7788 | tree variant_type = TREE_TYPE (gnu_field), variant_subpart; |
fb7fb701 NF |
7789 | |
7790 | v = VEC_safe_push (variant_desc, heap, variant_list, NULL); | |
7791 | v->type = variant_type; | |
7792 | v->field = gnu_field; | |
7793 | v->qual = qual; | |
7794 | v->record = NULL_TREE; | |
95c1c4bb EB |
7795 | |
7796 | /* Recurse on the variant subpart of the variant, if any. */ | |
7797 | variant_subpart = get_variant_part (variant_type); | |
7798 | if (variant_subpart) | |
fb7fb701 NF |
7799 | variant_list = build_variant_list (TREE_TYPE (variant_subpart), |
7800 | subst_list, variant_list); | |
95c1c4bb EB |
7801 | |
7802 | /* If the new qualifier is unconditionally true, the subsequent | |
7803 | variants cannot be accessed. */ | |
7804 | if (integer_onep (qual)) | |
7805 | break; | |
7806 | } | |
a1ab4c31 AC |
7807 | } |
7808 | ||
fb7fb701 | 7809 | return variant_list; |
a1ab4c31 AC |
7810 | } |
7811 | \f | |
7812 | /* UINT_SIZE is a Uint giving the specified size for an object of GNU_TYPE | |
0d853156 EB |
7813 | corresponding to GNAT_OBJECT. If the size is valid, return an INTEGER_CST |
7814 | corresponding to its value. Otherwise, return NULL_TREE. KIND is set to | |
7815 | VAR_DECL if we are specifying the size of an object, TYPE_DECL for the | |
7816 | size of a type, and FIELD_DECL for the size of a field. COMPONENT_P is | |
7817 | true if we are being called to process the Component_Size of GNAT_OBJECT; | |
7818 | this is used only for error messages. ZERO_OK is true if a size of zero | |
7819 | is permitted; if ZERO_OK is false, it means that a size of zero should be | |
7820 | treated as an unspecified size. */ | |
a1ab4c31 AC |
7821 | |
7822 | static tree | |
7823 | validate_size (Uint uint_size, tree gnu_type, Entity_Id gnat_object, | |
7824 | enum tree_code kind, bool component_p, bool zero_ok) | |
7825 | { | |
7826 | Node_Id gnat_error_node; | |
7827 | tree type_size, size; | |
7828 | ||
8ff6c664 EB |
7829 | /* Return 0 if no size was specified. */ |
7830 | if (uint_size == No_Uint) | |
7831 | return NULL_TREE; | |
a1ab4c31 | 7832 | |
728936bb EB |
7833 | /* Ignore a negative size since that corresponds to our back-annotation. */ |
7834 | if (UI_Lt (uint_size, Uint_0)) | |
7835 | return NULL_TREE; | |
7836 | ||
0d853156 | 7837 | /* Find the node to use for error messages. */ |
a1ab4c31 AC |
7838 | if ((Ekind (gnat_object) == E_Component |
7839 | || Ekind (gnat_object) == E_Discriminant) | |
7840 | && Present (Component_Clause (gnat_object))) | |
7841 | gnat_error_node = Last_Bit (Component_Clause (gnat_object)); | |
7842 | else if (Present (Size_Clause (gnat_object))) | |
7843 | gnat_error_node = Expression (Size_Clause (gnat_object)); | |
7844 | else | |
7845 | gnat_error_node = gnat_object; | |
7846 | ||
0d853156 EB |
7847 | /* Get the size as an INTEGER_CST. Issue an error if a size was specified |
7848 | but cannot be represented in bitsizetype. */ | |
a1ab4c31 AC |
7849 | size = UI_To_gnu (uint_size, bitsizetype); |
7850 | if (TREE_OVERFLOW (size)) | |
7851 | { | |
8ff6c664 | 7852 | if (component_p) |
0d853156 | 7853 | post_error_ne ("component size for& is too large", gnat_error_node, |
8ff6c664 EB |
7854 | gnat_object); |
7855 | else | |
0d853156 | 7856 | post_error_ne ("size for& is too large", gnat_error_node, |
8ff6c664 | 7857 | gnat_object); |
a1ab4c31 AC |
7858 | return NULL_TREE; |
7859 | } | |
7860 | ||
728936bb EB |
7861 | /* Ignore a zero size if it is not permitted. */ |
7862 | if (!zero_ok && integer_zerop (size)) | |
a1ab4c31 AC |
7863 | return NULL_TREE; |
7864 | ||
7865 | /* The size of objects is always a multiple of a byte. */ | |
7866 | if (kind == VAR_DECL | |
7867 | && !integer_zerop (size_binop (TRUNC_MOD_EXPR, size, bitsize_unit_node))) | |
7868 | { | |
7869 | if (component_p) | |
7870 | post_error_ne ("component size for& is not a multiple of Storage_Unit", | |
7871 | gnat_error_node, gnat_object); | |
7872 | else | |
7873 | post_error_ne ("size for& is not a multiple of Storage_Unit", | |
7874 | gnat_error_node, gnat_object); | |
7875 | return NULL_TREE; | |
7876 | } | |
7877 | ||
7878 | /* If this is an integral type or a packed array type, the front-end has | |
0d853156 | 7879 | already verified the size, so we need not do it here (which would mean |
a8e05f92 EB |
7880 | checking against the bounds). However, if this is an aliased object, |
7881 | it may not be smaller than the type of the object. */ | |
a1ab4c31 AC |
7882 | if ((INTEGRAL_TYPE_P (gnu_type) || TYPE_IS_PACKED_ARRAY_TYPE_P (gnu_type)) |
7883 | && !(kind == VAR_DECL && Is_Aliased (gnat_object))) | |
7884 | return size; | |
7885 | ||
0d853156 EB |
7886 | /* If the object is a record that contains a template, add the size of the |
7887 | template to the specified size. */ | |
a1ab4c31 AC |
7888 | if (TREE_CODE (gnu_type) == RECORD_TYPE |
7889 | && TYPE_CONTAINS_TEMPLATE_P (gnu_type)) | |
7890 | size = size_binop (PLUS_EXPR, DECL_SIZE (TYPE_FIELDS (gnu_type)), size); | |
7891 | ||
8ff6c664 EB |
7892 | if (kind == VAR_DECL |
7893 | /* If a type needs strict alignment, a component of this type in | |
7894 | a packed record cannot be packed and thus uses the type size. */ | |
7895 | || (kind == TYPE_DECL && Strict_Alignment (gnat_object))) | |
7896 | type_size = TYPE_SIZE (gnu_type); | |
7897 | else | |
7898 | type_size = rm_size (gnu_type); | |
7899 | ||
0d853156 | 7900 | /* Modify the size of a discriminated type to be the maximum size. */ |
a1ab4c31 AC |
7901 | if (type_size && CONTAINS_PLACEHOLDER_P (type_size)) |
7902 | type_size = max_size (type_size, true); | |
7903 | ||
7904 | /* If this is an access type or a fat pointer, the minimum size is that given | |
7905 | by the smallest integral mode that's valid for pointers. */ | |
315cff15 | 7906 | if (TREE_CODE (gnu_type) == POINTER_TYPE || TYPE_IS_FAT_POINTER_P (gnu_type)) |
a1ab4c31 | 7907 | { |
8ff6c664 EB |
7908 | enum machine_mode p_mode = GET_CLASS_NARROWEST_MODE (MODE_INT); |
7909 | while (!targetm.valid_pointer_mode (p_mode)) | |
7910 | p_mode = GET_MODE_WIDER_MODE (p_mode); | |
a1ab4c31 AC |
7911 | type_size = bitsize_int (GET_MODE_BITSIZE (p_mode)); |
7912 | } | |
7913 | ||
0d853156 EB |
7914 | /* Issue an error either if the default size of the object isn't a constant |
7915 | or if the new size is smaller than it. */ | |
a1ab4c31 AC |
7916 | if (TREE_CODE (type_size) != INTEGER_CST |
7917 | || TREE_OVERFLOW (type_size) | |
7918 | || tree_int_cst_lt (size, type_size)) | |
7919 | { | |
7920 | if (component_p) | |
7921 | post_error_ne_tree | |
7922 | ("component size for& too small{, minimum allowed is ^}", | |
7923 | gnat_error_node, gnat_object, type_size); | |
7924 | else | |
8ff6c664 EB |
7925 | post_error_ne_tree |
7926 | ("size for& too small{, minimum allowed is ^}", | |
7927 | gnat_error_node, gnat_object, type_size); | |
0d853156 | 7928 | return NULL_TREE; |
a1ab4c31 AC |
7929 | } |
7930 | ||
7931 | return size; | |
7932 | } | |
7933 | \f | |
0d853156 EB |
7934 | /* Similarly, but both validate and process a value of RM size. This routine |
7935 | is only called for types. */ | |
a1ab4c31 AC |
7936 | |
7937 | static void | |
7938 | set_rm_size (Uint uint_size, tree gnu_type, Entity_Id gnat_entity) | |
7939 | { | |
8ff6c664 EB |
7940 | Node_Id gnat_attr_node; |
7941 | tree old_size, size; | |
7942 | ||
7943 | /* Do nothing if no size was specified. */ | |
7944 | if (uint_size == No_Uint) | |
7945 | return; | |
7946 | ||
728936bb EB |
7947 | /* Ignore a negative size since that corresponds to our back-annotation. */ |
7948 | if (UI_Lt (uint_size, Uint_0)) | |
7949 | return; | |
7950 | ||
a8e05f92 | 7951 | /* Only issue an error if a Value_Size clause was explicitly given. |
a1ab4c31 | 7952 | Otherwise, we'd be duplicating an error on the Size clause. */ |
8ff6c664 | 7953 | gnat_attr_node |
a1ab4c31 | 7954 | = Get_Attribute_Definition_Clause (gnat_entity, Attr_Value_Size); |
a1ab4c31 | 7955 | |
0d853156 EB |
7956 | /* Get the size as an INTEGER_CST. Issue an error if a size was specified |
7957 | but cannot be represented in bitsizetype. */ | |
a1ab4c31 AC |
7958 | size = UI_To_gnu (uint_size, bitsizetype); |
7959 | if (TREE_OVERFLOW (size)) | |
7960 | { | |
7961 | if (Present (gnat_attr_node)) | |
0d853156 | 7962 | post_error_ne ("Value_Size for& is too large", gnat_attr_node, |
a1ab4c31 | 7963 | gnat_entity); |
a1ab4c31 AC |
7964 | return; |
7965 | } | |
7966 | ||
728936bb EB |
7967 | /* Ignore a zero size unless a Value_Size clause exists, or a size clause |
7968 | exists, or this is an integer type, in which case the front-end will | |
7969 | have always set it. */ | |
7970 | if (No (gnat_attr_node) | |
7971 | && integer_zerop (size) | |
7972 | && !Has_Size_Clause (gnat_entity) | |
7973 | && !Is_Discrete_Or_Fixed_Point_Type (gnat_entity)) | |
a1ab4c31 AC |
7974 | return; |
7975 | ||
8ff6c664 EB |
7976 | old_size = rm_size (gnu_type); |
7977 | ||
a1ab4c31 AC |
7978 | /* If the old size is self-referential, get the maximum size. */ |
7979 | if (CONTAINS_PLACEHOLDER_P (old_size)) | |
7980 | old_size = max_size (old_size, true); | |
7981 | ||
0d853156 EB |
7982 | /* Issue an error either if the old size of the object isn't a constant or |
7983 | if the new size is smaller than it. The front-end has already verified | |
7984 | this for scalar and packed array types. */ | |
a1ab4c31 AC |
7985 | if (TREE_CODE (old_size) != INTEGER_CST |
7986 | || TREE_OVERFLOW (old_size) | |
03049a4e EB |
7987 | || (AGGREGATE_TYPE_P (gnu_type) |
7988 | && !(TREE_CODE (gnu_type) == ARRAY_TYPE | |
7989 | && TYPE_PACKED_ARRAY_TYPE_P (gnu_type)) | |
315cff15 | 7990 | && !(TYPE_IS_PADDING_P (gnu_type) |
03049a4e | 7991 | && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type))) == ARRAY_TYPE |
58c8f770 EB |
7992 | && TYPE_PACKED_ARRAY_TYPE_P |
7993 | (TREE_TYPE (TYPE_FIELDS (gnu_type)))) | |
03049a4e | 7994 | && tree_int_cst_lt (size, old_size))) |
a1ab4c31 AC |
7995 | { |
7996 | if (Present (gnat_attr_node)) | |
7997 | post_error_ne_tree | |
7998 | ("Value_Size for& too small{, minimum allowed is ^}", | |
7999 | gnat_attr_node, gnat_entity, old_size); | |
a1ab4c31 AC |
8000 | return; |
8001 | } | |
8002 | ||
e6e15ec9 | 8003 | /* Otherwise, set the RM size proper for integral types... */ |
b4680ca1 EB |
8004 | if ((TREE_CODE (gnu_type) == INTEGER_TYPE |
8005 | && Is_Discrete_Or_Fixed_Point_Type (gnat_entity)) | |
8006 | || (TREE_CODE (gnu_type) == ENUMERAL_TYPE | |
8007 | || TREE_CODE (gnu_type) == BOOLEAN_TYPE)) | |
84fb43a1 | 8008 | SET_TYPE_RM_SIZE (gnu_type, size); |
b4680ca1 EB |
8009 | |
8010 | /* ...or the Ada size for record and union types. */ | |
a1ab4c31 AC |
8011 | else if ((TREE_CODE (gnu_type) == RECORD_TYPE |
8012 | || TREE_CODE (gnu_type) == UNION_TYPE | |
8013 | || TREE_CODE (gnu_type) == QUAL_UNION_TYPE) | |
315cff15 | 8014 | && !TYPE_FAT_POINTER_P (gnu_type)) |
a1ab4c31 AC |
8015 | SET_TYPE_ADA_SIZE (gnu_type, size); |
8016 | } | |
8017 | \f | |
8018 | /* Given a type TYPE, return a new type whose size is appropriate for SIZE. | |
8019 | If TYPE is the best type, return it. Otherwise, make a new type. We | |
1e17ef87 | 8020 | only support new integral and pointer types. FOR_BIASED is true if |
a1ab4c31 AC |
8021 | we are making a biased type. */ |
8022 | ||
8023 | static tree | |
8024 | make_type_from_size (tree type, tree size_tree, bool for_biased) | |
8025 | { | |
8026 | unsigned HOST_WIDE_INT size; | |
e66e5d9e | 8027 | bool biased_p; |
a1ab4c31 AC |
8028 | tree new_type; |
8029 | ||
8030 | /* If size indicates an error, just return TYPE to avoid propagating | |
8031 | the error. Likewise if it's too large to represent. */ | |
8032 | if (!size_tree || !host_integerp (size_tree, 1)) | |
8033 | return type; | |
8034 | ||
8035 | size = tree_low_cst (size_tree, 1); | |
8036 | ||
8037 | switch (TREE_CODE (type)) | |
8038 | { | |
8039 | case INTEGER_TYPE: | |
8040 | case ENUMERAL_TYPE: | |
01ddebf2 | 8041 | case BOOLEAN_TYPE: |
a1ab4c31 AC |
8042 | biased_p = (TREE_CODE (type) == INTEGER_TYPE |
8043 | && TYPE_BIASED_REPRESENTATION_P (type)); | |
8044 | ||
ff67c0a5 EB |
8045 | /* Integer types with precision 0 are forbidden. */ |
8046 | if (size == 0) | |
8047 | size = 1; | |
8048 | ||
a1ab4c31 AC |
8049 | /* Only do something if the type is not a packed array type and |
8050 | doesn't already have the proper size. */ | |
8051 | if (TYPE_PACKED_ARRAY_TYPE_P (type) | |
e66e5d9e | 8052 | || (TYPE_PRECISION (type) == size && biased_p == for_biased)) |
a1ab4c31 AC |
8053 | break; |
8054 | ||
8055 | biased_p |= for_biased; | |
feec4372 EB |
8056 | if (size > LONG_LONG_TYPE_SIZE) |
8057 | size = LONG_LONG_TYPE_SIZE; | |
a1ab4c31 AC |
8058 | |
8059 | if (TYPE_UNSIGNED (type) || biased_p) | |
8060 | new_type = make_unsigned_type (size); | |
8061 | else | |
8062 | new_type = make_signed_type (size); | |
8063 | TREE_TYPE (new_type) = TREE_TYPE (type) ? TREE_TYPE (type) : type; | |
84fb43a1 EB |
8064 | SET_TYPE_RM_MIN_VALUE (new_type, |
8065 | convert (TREE_TYPE (new_type), | |
8066 | TYPE_MIN_VALUE (type))); | |
8067 | SET_TYPE_RM_MAX_VALUE (new_type, | |
8068 | convert (TREE_TYPE (new_type), | |
8069 | TYPE_MAX_VALUE (type))); | |
169afcb9 EB |
8070 | /* Copy the name to show that it's essentially the same type and |
8071 | not a subrange type. */ | |
8072 | TYPE_NAME (new_type) = TYPE_NAME (type); | |
a1ab4c31 | 8073 | TYPE_BIASED_REPRESENTATION_P (new_type) = biased_p; |
84fb43a1 | 8074 | SET_TYPE_RM_SIZE (new_type, bitsize_int (size)); |
a1ab4c31 AC |
8075 | return new_type; |
8076 | ||
8077 | case RECORD_TYPE: | |
8078 | /* Do something if this is a fat pointer, in which case we | |
8079 | may need to return the thin pointer. */ | |
315cff15 | 8080 | if (TYPE_FAT_POINTER_P (type) && size < POINTER_SIZE * 2) |
6ca2b0a0 DR |
8081 | { |
8082 | enum machine_mode p_mode = mode_for_size (size, MODE_INT, 0); | |
8083 | if (!targetm.valid_pointer_mode (p_mode)) | |
8084 | p_mode = ptr_mode; | |
8085 | return | |
8086 | build_pointer_type_for_mode | |
8087 | (TYPE_OBJECT_RECORD_TYPE (TYPE_UNCONSTRAINED_ARRAY (type)), | |
8088 | p_mode, 0); | |
8089 | } | |
a1ab4c31 AC |
8090 | break; |
8091 | ||
8092 | case POINTER_TYPE: | |
8093 | /* Only do something if this is a thin pointer, in which case we | |
8094 | may need to return the fat pointer. */ | |
315cff15 | 8095 | if (TYPE_IS_THIN_POINTER_P (type) && size >= POINTER_SIZE * 2) |
a1ab4c31 AC |
8096 | return |
8097 | build_pointer_type (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type))); | |
8098 | break; | |
8099 | ||
8100 | default: | |
8101 | break; | |
8102 | } | |
8103 | ||
8104 | return type; | |
8105 | } | |
8106 | \f | |
8107 | /* ALIGNMENT is a Uint giving the alignment specified for GNAT_ENTITY, | |
8108 | a type or object whose present alignment is ALIGN. If this alignment is | |
8109 | valid, return it. Otherwise, give an error and return ALIGN. */ | |
8110 | ||
8111 | static unsigned int | |
8112 | validate_alignment (Uint alignment, Entity_Id gnat_entity, unsigned int align) | |
8113 | { | |
8114 | unsigned int max_allowed_alignment = get_target_maximum_allowed_alignment (); | |
8115 | unsigned int new_align; | |
8116 | Node_Id gnat_error_node; | |
8117 | ||
8118 | /* Don't worry about checking alignment if alignment was not specified | |
8119 | by the source program and we already posted an error for this entity. */ | |
8120 | if (Error_Posted (gnat_entity) && !Has_Alignment_Clause (gnat_entity)) | |
8121 | return align; | |
8122 | ||
ec88784d AC |
8123 | /* Post the error on the alignment clause if any. Note, for the implicit |
8124 | base type of an array type, the alignment clause is on the first | |
8125 | subtype. */ | |
a1ab4c31 AC |
8126 | if (Present (Alignment_Clause (gnat_entity))) |
8127 | gnat_error_node = Expression (Alignment_Clause (gnat_entity)); | |
ec88784d AC |
8128 | |
8129 | else if (Is_Itype (gnat_entity) | |
8130 | && Is_Array_Type (gnat_entity) | |
8131 | && Etype (gnat_entity) == gnat_entity | |
8132 | && Present (Alignment_Clause (First_Subtype (gnat_entity)))) | |
8133 | gnat_error_node = | |
8134 | Expression (Alignment_Clause (First_Subtype (gnat_entity))); | |
8135 | ||
a1ab4c31 AC |
8136 | else |
8137 | gnat_error_node = gnat_entity; | |
8138 | ||
8139 | /* Within GCC, an alignment is an integer, so we must make sure a value is | |
8140 | specified that fits in that range. Also, there is an upper bound to | |
8141 | alignments we can support/allow. */ | |
8142 | if (!UI_Is_In_Int_Range (alignment) | |
8143 | || ((new_align = UI_To_Int (alignment)) > max_allowed_alignment)) | |
8144 | post_error_ne_num ("largest supported alignment for& is ^", | |
8145 | gnat_error_node, gnat_entity, max_allowed_alignment); | |
8146 | else if (!(Present (Alignment_Clause (gnat_entity)) | |
8147 | && From_At_Mod (Alignment_Clause (gnat_entity))) | |
8148 | && new_align * BITS_PER_UNIT < align) | |
caa9d12a EB |
8149 | { |
8150 | unsigned int double_align; | |
8151 | bool is_capped_double, align_clause; | |
8152 | ||
8153 | /* If the default alignment of "double" or larger scalar types is | |
8154 | specifically capped and the new alignment is above the cap, do | |
8155 | not post an error and change the alignment only if there is an | |
8156 | alignment clause; this makes it possible to have the associated | |
8157 | GCC type overaligned by default for performance reasons. */ | |
8158 | if ((double_align = double_float_alignment) > 0) | |
8159 | { | |
8160 | Entity_Id gnat_type | |
8161 | = Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity); | |
8162 | is_capped_double | |
8163 | = is_double_float_or_array (gnat_type, &align_clause); | |
8164 | } | |
8165 | else if ((double_align = double_scalar_alignment) > 0) | |
8166 | { | |
8167 | Entity_Id gnat_type | |
8168 | = Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity); | |
8169 | is_capped_double | |
8170 | = is_double_scalar_or_array (gnat_type, &align_clause); | |
8171 | } | |
8172 | else | |
8173 | is_capped_double = align_clause = false; | |
8174 | ||
8175 | if (is_capped_double && new_align >= double_align) | |
8176 | { | |
8177 | if (align_clause) | |
8178 | align = new_align * BITS_PER_UNIT; | |
8179 | } | |
8180 | else | |
8181 | { | |
8182 | if (is_capped_double) | |
8183 | align = double_align * BITS_PER_UNIT; | |
8184 | ||
8185 | post_error_ne_num ("alignment for& must be at least ^", | |
8186 | gnat_error_node, gnat_entity, | |
8187 | align / BITS_PER_UNIT); | |
8188 | } | |
8189 | } | |
a1ab4c31 AC |
8190 | else |
8191 | { | |
8192 | new_align = (new_align > 0 ? new_align * BITS_PER_UNIT : 1); | |
8193 | if (new_align > align) | |
8194 | align = new_align; | |
8195 | } | |
8196 | ||
8197 | return align; | |
8198 | } | |
8199 | ||
8200 | /* Return the smallest alignment not less than SIZE. */ | |
8201 | ||
8202 | static unsigned int | |
8203 | ceil_alignment (unsigned HOST_WIDE_INT size) | |
8204 | { | |
8205 | return (unsigned int) 1 << (floor_log2 (size - 1) + 1); | |
8206 | } | |
8207 | \f | |
8208 | /* Verify that OBJECT, a type or decl, is something we can implement | |
8209 | atomically. If not, give an error for GNAT_ENTITY. COMP_P is true | |
8210 | if we require atomic components. */ | |
8211 | ||
8212 | static void | |
8213 | check_ok_for_atomic (tree object, Entity_Id gnat_entity, bool comp_p) | |
8214 | { | |
8215 | Node_Id gnat_error_point = gnat_entity; | |
8216 | Node_Id gnat_node; | |
8217 | enum machine_mode mode; | |
8218 | unsigned int align; | |
8219 | tree size; | |
8220 | ||
8221 | /* There are three case of what OBJECT can be. It can be a type, in which | |
8222 | case we take the size, alignment and mode from the type. It can be a | |
8223 | declaration that was indirect, in which case the relevant values are | |
8224 | that of the type being pointed to, or it can be a normal declaration, | |
8225 | in which case the values are of the decl. The code below assumes that | |
8226 | OBJECT is either a type or a decl. */ | |
8227 | if (TYPE_P (object)) | |
8228 | { | |
5004b234 EB |
8229 | /* If this is an anonymous base type, nothing to check. Error will be |
8230 | reported on the source type. */ | |
8231 | if (!Comes_From_Source (gnat_entity)) | |
8232 | return; | |
8233 | ||
a1ab4c31 AC |
8234 | mode = TYPE_MODE (object); |
8235 | align = TYPE_ALIGN (object); | |
8236 | size = TYPE_SIZE (object); | |
8237 | } | |
8238 | else if (DECL_BY_REF_P (object)) | |
8239 | { | |
8240 | mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (object))); | |
8241 | align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (object))); | |
8242 | size = TYPE_SIZE (TREE_TYPE (TREE_TYPE (object))); | |
8243 | } | |
8244 | else | |
8245 | { | |
8246 | mode = DECL_MODE (object); | |
8247 | align = DECL_ALIGN (object); | |
8248 | size = DECL_SIZE (object); | |
8249 | } | |
8250 | ||
8251 | /* Consider all floating-point types atomic and any types that that are | |
8252 | represented by integers no wider than a machine word. */ | |
8253 | if (GET_MODE_CLASS (mode) == MODE_FLOAT | |
8254 | || ((GET_MODE_CLASS (mode) == MODE_INT | |
8255 | || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT) | |
8256 | && GET_MODE_BITSIZE (mode) <= BITS_PER_WORD)) | |
8257 | return; | |
8258 | ||
8259 | /* For the moment, also allow anything that has an alignment equal | |
8260 | to its size and which is smaller than a word. */ | |
8261 | if (size && TREE_CODE (size) == INTEGER_CST | |
8262 | && compare_tree_int (size, align) == 0 | |
8263 | && align <= BITS_PER_WORD) | |
8264 | return; | |
8265 | ||
8266 | for (gnat_node = First_Rep_Item (gnat_entity); Present (gnat_node); | |
8267 | gnat_node = Next_Rep_Item (gnat_node)) | |
8268 | { | |
8269 | if (!comp_p && Nkind (gnat_node) == N_Pragma | |
8270 | && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node))) | |
8271 | == Pragma_Atomic)) | |
8272 | gnat_error_point = First (Pragma_Argument_Associations (gnat_node)); | |
8273 | else if (comp_p && Nkind (gnat_node) == N_Pragma | |
8274 | && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node))) | |
8275 | == Pragma_Atomic_Components)) | |
8276 | gnat_error_point = First (Pragma_Argument_Associations (gnat_node)); | |
8277 | } | |
8278 | ||
8279 | if (comp_p) | |
8280 | post_error_ne ("atomic access to component of & cannot be guaranteed", | |
8281 | gnat_error_point, gnat_entity); | |
8282 | else | |
8283 | post_error_ne ("atomic access to & cannot be guaranteed", | |
8284 | gnat_error_point, gnat_entity); | |
8285 | } | |
8286 | \f | |
a1ab4c31 | 8287 | |
1515785d OH |
8288 | /* Helper for the intrin compatibility checks family. Evaluate whether |
8289 | two types are definitely incompatible. */ | |
a1ab4c31 | 8290 | |
1515785d OH |
8291 | static bool |
8292 | intrin_types_incompatible_p (tree t1, tree t2) | |
8293 | { | |
8294 | enum tree_code code; | |
8295 | ||
8296 | if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2)) | |
8297 | return false; | |
8298 | ||
8299 | if (TYPE_MODE (t1) != TYPE_MODE (t2)) | |
8300 | return true; | |
8301 | ||
8302 | if (TREE_CODE (t1) != TREE_CODE (t2)) | |
8303 | return true; | |
8304 | ||
8305 | code = TREE_CODE (t1); | |
8306 | ||
8307 | switch (code) | |
8308 | { | |
8309 | case INTEGER_TYPE: | |
8310 | case REAL_TYPE: | |
8311 | return TYPE_PRECISION (t1) != TYPE_PRECISION (t2); | |
8312 | ||
8313 | case POINTER_TYPE: | |
8314 | case REFERENCE_TYPE: | |
8315 | /* Assume designated types are ok. We'd need to account for char * and | |
8316 | void * variants to do better, which could rapidly get messy and isn't | |
8317 | clearly worth the effort. */ | |
8318 | return false; | |
8319 | ||
8320 | default: | |
8321 | break; | |
8322 | } | |
8323 | ||
8324 | return false; | |
8325 | } | |
8326 | ||
8327 | /* Helper for intrin_profiles_compatible_p, to perform compatibility checks | |
8328 | on the Ada/builtin argument lists for the INB binding. */ | |
8329 | ||
8330 | static bool | |
8331 | intrin_arglists_compatible_p (intrin_binding_t * inb) | |
a1ab4c31 | 8332 | { |
d7d058c5 NF |
8333 | function_args_iterator ada_iter, btin_iter; |
8334 | ||
8335 | function_args_iter_init (&ada_iter, inb->ada_fntype); | |
8336 | function_args_iter_init (&btin_iter, inb->btin_fntype); | |
1515785d OH |
8337 | |
8338 | /* Sequence position of the last argument we checked. */ | |
8339 | int argpos = 0; | |
8340 | ||
d7d058c5 | 8341 | while (1) |
1515785d | 8342 | { |
d7d058c5 NF |
8343 | tree ada_type = function_args_iter_cond (&ada_iter); |
8344 | tree btin_type = function_args_iter_cond (&btin_iter); | |
8345 | ||
8346 | /* If we've exhausted both lists simultaneously, we're done. */ | |
8347 | if (ada_type == NULL_TREE && btin_type == NULL_TREE) | |
8348 | break; | |
1515785d OH |
8349 | |
8350 | /* If one list is shorter than the other, they fail to match. */ | |
d7d058c5 | 8351 | if (ada_type == NULL_TREE || btin_type == NULL_TREE) |
1515785d OH |
8352 | return false; |
8353 | ||
1515785d | 8354 | /* If we're done with the Ada args and not with the internal builtin |
bb511fbd | 8355 | args, or the other way around, complain. */ |
1515785d OH |
8356 | if (ada_type == void_type_node |
8357 | && btin_type != void_type_node) | |
8358 | { | |
8359 | post_error ("?Ada arguments list too short!", inb->gnat_entity); | |
8360 | return false; | |
8361 | } | |
8362 | ||
1515785d OH |
8363 | if (btin_type == void_type_node |
8364 | && ada_type != void_type_node) | |
8365 | { | |
bb511fbd OH |
8366 | post_error_ne_num ("?Ada arguments list too long ('> ^)!", |
8367 | inb->gnat_entity, inb->gnat_entity, argpos); | |
8368 | return false; | |
1515785d OH |
8369 | } |
8370 | ||
8371 | /* Otherwise, check that types match for the current argument. */ | |
8372 | argpos ++; | |
8373 | if (intrin_types_incompatible_p (ada_type, btin_type)) | |
8374 | { | |
8375 | post_error_ne_num ("?intrinsic binding type mismatch on argument ^!", | |
8376 | inb->gnat_entity, inb->gnat_entity, argpos); | |
8377 | return false; | |
8378 | } | |
8379 | ||
f620bd21 | 8380 | |
d7d058c5 NF |
8381 | function_args_iter_next (&ada_iter); |
8382 | function_args_iter_next (&btin_iter); | |
1515785d OH |
8383 | } |
8384 | ||
8385 | return true; | |
8386 | } | |
8387 | ||
8388 | /* Helper for intrin_profiles_compatible_p, to perform compatibility checks | |
8389 | on the Ada/builtin return values for the INB binding. */ | |
8390 | ||
8391 | static bool | |
8392 | intrin_return_compatible_p (intrin_binding_t * inb) | |
8393 | { | |
8394 | tree ada_return_type = TREE_TYPE (inb->ada_fntype); | |
8395 | tree btin_return_type = TREE_TYPE (inb->btin_fntype); | |
8396 | ||
bb511fbd | 8397 | /* Accept function imported as procedure, common and convenient. */ |
1515785d OH |
8398 | if (VOID_TYPE_P (ada_return_type) |
8399 | && !VOID_TYPE_P (btin_return_type)) | |
bb511fbd | 8400 | return true; |
1515785d | 8401 | |
bb511fbd OH |
8402 | /* Check return types compatibility otherwise. Note that this |
8403 | handles void/void as well. */ | |
1515785d OH |
8404 | if (intrin_types_incompatible_p (btin_return_type, ada_return_type)) |
8405 | { | |
8406 | post_error ("?intrinsic binding type mismatch on return value!", | |
8407 | inb->gnat_entity); | |
8408 | return false; | |
8409 | } | |
8410 | ||
8411 | return true; | |
8412 | } | |
8413 | ||
8414 | /* Check and return whether the Ada and gcc builtin profiles bound by INB are | |
8415 | compatible. Issue relevant warnings when they are not. | |
8416 | ||
8417 | This is intended as a light check to diagnose the most obvious cases, not | |
308e6f3a | 8418 | as a full fledged type compatibility predicate. It is the programmer's |
1515785d OH |
8419 | responsibility to ensure correctness of the Ada declarations in Imports, |
8420 | especially when binding straight to a compiler internal. */ | |
8421 | ||
8422 | static bool | |
8423 | intrin_profiles_compatible_p (intrin_binding_t * inb) | |
8424 | { | |
8425 | /* Check compatibility on return values and argument lists, each responsible | |
8426 | for posting warnings as appropriate. Ensure use of the proper sloc for | |
8427 | this purpose. */ | |
8428 | ||
8429 | bool arglists_compatible_p, return_compatible_p; | |
8430 | location_t saved_location = input_location; | |
8431 | ||
8432 | Sloc_to_locus (Sloc (inb->gnat_entity), &input_location); | |
a1ab4c31 | 8433 | |
1515785d OH |
8434 | return_compatible_p = intrin_return_compatible_p (inb); |
8435 | arglists_compatible_p = intrin_arglists_compatible_p (inb); | |
a1ab4c31 | 8436 | |
1515785d | 8437 | input_location = saved_location; |
a1ab4c31 | 8438 | |
1515785d | 8439 | return return_compatible_p && arglists_compatible_p; |
a1ab4c31 AC |
8440 | } |
8441 | \f | |
95c1c4bb EB |
8442 | /* Return a FIELD_DECL node modeled on OLD_FIELD. FIELD_TYPE is its type |
8443 | and RECORD_TYPE is the type of the parent. If SIZE is nonzero, it is the | |
8444 | specified size for this field. POS_LIST is a position list describing | |
8445 | the layout of OLD_FIELD and SUBST_LIST a substitution list to be applied | |
8446 | to this layout. */ | |
8447 | ||
8448 | static tree | |
8449 | create_field_decl_from (tree old_field, tree field_type, tree record_type, | |
e3554601 NF |
8450 | tree size, tree pos_list, |
8451 | VEC(subst_pair,heap) *subst_list) | |
95c1c4bb EB |
8452 | { |
8453 | tree t = TREE_VALUE (purpose_member (old_field, pos_list)); | |
8454 | tree pos = TREE_VEC_ELT (t, 0), bitpos = TREE_VEC_ELT (t, 2); | |
8455 | unsigned int offset_align = tree_low_cst (TREE_VEC_ELT (t, 1), 1); | |
8456 | tree new_pos, new_field; | |
e3554601 NF |
8457 | unsigned ix; |
8458 | subst_pair *s; | |
95c1c4bb EB |
8459 | |
8460 | if (CONTAINS_PLACEHOLDER_P (pos)) | |
e3554601 NF |
8461 | FOR_EACH_VEC_ELT_REVERSE (subst_pair, subst_list, ix, s) |
8462 | pos = SUBSTITUTE_IN_EXPR (pos, s->discriminant, s->replacement); | |
95c1c4bb EB |
8463 | |
8464 | /* If the position is now a constant, we can set it as the position of the | |
8465 | field when we make it. Otherwise, we need to deal with it specially. */ | |
8466 | if (TREE_CONSTANT (pos)) | |
8467 | new_pos = bit_from_pos (pos, bitpos); | |
8468 | else | |
8469 | new_pos = NULL_TREE; | |
8470 | ||
8471 | new_field | |
8472 | = create_field_decl (DECL_NAME (old_field), field_type, record_type, | |
da01bfee | 8473 | size, new_pos, DECL_PACKED (old_field), |
95c1c4bb EB |
8474 | !DECL_NONADDRESSABLE_P (old_field)); |
8475 | ||
8476 | if (!new_pos) | |
8477 | { | |
8478 | normalize_offset (&pos, &bitpos, offset_align); | |
8479 | DECL_FIELD_OFFSET (new_field) = pos; | |
8480 | DECL_FIELD_BIT_OFFSET (new_field) = bitpos; | |
8481 | SET_DECL_OFFSET_ALIGN (new_field, offset_align); | |
8482 | DECL_SIZE (new_field) = size; | |
8483 | DECL_SIZE_UNIT (new_field) | |
8484 | = convert (sizetype, | |
8485 | size_binop (CEIL_DIV_EXPR, size, bitsize_unit_node)); | |
8486 | layout_decl (new_field, DECL_OFFSET_ALIGN (new_field)); | |
8487 | } | |
8488 | ||
8489 | DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field); | |
cb3d597d | 8490 | SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, old_field); |
95c1c4bb EB |
8491 | DECL_DISCRIMINANT_NUMBER (new_field) = DECL_DISCRIMINANT_NUMBER (old_field); |
8492 | TREE_THIS_VOLATILE (new_field) = TREE_THIS_VOLATILE (old_field); | |
8493 | ||
8494 | return new_field; | |
8495 | } | |
8496 | ||
8497 | /* Return the REP part of RECORD_TYPE, if any. Otherwise return NULL. */ | |
8498 | ||
8499 | static tree | |
8500 | get_rep_part (tree record_type) | |
8501 | { | |
8502 | tree field = TYPE_FIELDS (record_type); | |
8503 | ||
8504 | /* The REP part is the first field, internal, another record, and its name | |
8505 | doesn't start with an underscore (i.e. is not generated by the FE). */ | |
8506 | if (DECL_INTERNAL_P (field) | |
8507 | && TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE | |
8508 | && IDENTIFIER_POINTER (DECL_NAME (field)) [0] != '_') | |
8509 | return field; | |
8510 | ||
8511 | return NULL_TREE; | |
8512 | } | |
8513 | ||
8514 | /* Return the variant part of RECORD_TYPE, if any. Otherwise return NULL. */ | |
8515 | ||
805e60a0 | 8516 | tree |
95c1c4bb EB |
8517 | get_variant_part (tree record_type) |
8518 | { | |
8519 | tree field; | |
8520 | ||
8521 | /* The variant part is the only internal field that is a qualified union. */ | |
910ad8de | 8522 | for (field = TYPE_FIELDS (record_type); field; field = DECL_CHAIN (field)) |
95c1c4bb EB |
8523 | if (DECL_INTERNAL_P (field) |
8524 | && TREE_CODE (TREE_TYPE (field)) == QUAL_UNION_TYPE) | |
8525 | return field; | |
8526 | ||
8527 | return NULL_TREE; | |
8528 | } | |
8529 | ||
8530 | /* Return a new variant part modeled on OLD_VARIANT_PART. VARIANT_LIST is | |
8531 | the list of variants to be used and RECORD_TYPE is the type of the parent. | |
8532 | POS_LIST is a position list describing the layout of fields present in | |
8533 | OLD_VARIANT_PART and SUBST_LIST a substitution list to be applied to this | |
8534 | layout. */ | |
8535 | ||
8536 | static tree | |
fb7fb701 NF |
8537 | create_variant_part_from (tree old_variant_part, |
8538 | VEC(variant_desc,heap) *variant_list, | |
e3554601 NF |
8539 | tree record_type, tree pos_list, |
8540 | VEC(subst_pair,heap) *subst_list) | |
95c1c4bb EB |
8541 | { |
8542 | tree offset = DECL_FIELD_OFFSET (old_variant_part); | |
95c1c4bb | 8543 | tree old_union_type = TREE_TYPE (old_variant_part); |
fb7fb701 | 8544 | tree new_union_type, new_variant_part; |
95c1c4bb | 8545 | tree union_field_list = NULL_TREE; |
fb7fb701 NF |
8546 | variant_desc *v; |
8547 | unsigned ix; | |
95c1c4bb EB |
8548 | |
8549 | /* First create the type of the variant part from that of the old one. */ | |
8550 | new_union_type = make_node (QUAL_UNION_TYPE); | |
8551 | TYPE_NAME (new_union_type) = DECL_NAME (TYPE_NAME (old_union_type)); | |
8552 | ||
8553 | /* If the position of the variant part is constant, subtract it from the | |
8554 | size of the type of the parent to get the new size. This manual CSE | |
8555 | reduces the code size when not optimizing. */ | |
da01bfee | 8556 | if (TREE_CODE (offset) == INTEGER_CST) |
95c1c4bb | 8557 | { |
da01bfee | 8558 | tree bitpos = DECL_FIELD_BIT_OFFSET (old_variant_part); |
95c1c4bb EB |
8559 | tree first_bit = bit_from_pos (offset, bitpos); |
8560 | TYPE_SIZE (new_union_type) | |
8561 | = size_binop (MINUS_EXPR, TYPE_SIZE (record_type), first_bit); | |
8562 | TYPE_SIZE_UNIT (new_union_type) | |
8563 | = size_binop (MINUS_EXPR, TYPE_SIZE_UNIT (record_type), | |
8564 | byte_from_pos (offset, bitpos)); | |
8565 | SET_TYPE_ADA_SIZE (new_union_type, | |
8566 | size_binop (MINUS_EXPR, TYPE_ADA_SIZE (record_type), | |
8567 | first_bit)); | |
8568 | TYPE_ALIGN (new_union_type) = TYPE_ALIGN (old_union_type); | |
8569 | relate_alias_sets (new_union_type, old_union_type, ALIAS_SET_COPY); | |
8570 | } | |
8571 | else | |
8572 | copy_and_substitute_in_size (new_union_type, old_union_type, subst_list); | |
8573 | ||
8574 | /* Now finish up the new variants and populate the union type. */ | |
fb7fb701 | 8575 | FOR_EACH_VEC_ELT_REVERSE (variant_desc, variant_list, ix, v) |
95c1c4bb | 8576 | { |
fb7fb701 | 8577 | tree old_field = v->field, new_field; |
95c1c4bb EB |
8578 | tree old_variant, old_variant_subpart, new_variant, field_list; |
8579 | ||
8580 | /* Skip variants that don't belong to this nesting level. */ | |
8581 | if (DECL_CONTEXT (old_field) != old_union_type) | |
8582 | continue; | |
8583 | ||
8584 | /* Retrieve the list of fields already added to the new variant. */ | |
fb7fb701 | 8585 | new_variant = v->record; |
95c1c4bb EB |
8586 | field_list = TYPE_FIELDS (new_variant); |
8587 | ||
8588 | /* If the old variant had a variant subpart, we need to create a new | |
8589 | variant subpart and add it to the field list. */ | |
fb7fb701 | 8590 | old_variant = v->type; |
95c1c4bb EB |
8591 | old_variant_subpart = get_variant_part (old_variant); |
8592 | if (old_variant_subpart) | |
8593 | { | |
8594 | tree new_variant_subpart | |
8595 | = create_variant_part_from (old_variant_subpart, variant_list, | |
8596 | new_variant, pos_list, subst_list); | |
910ad8de | 8597 | DECL_CHAIN (new_variant_subpart) = field_list; |
95c1c4bb EB |
8598 | field_list = new_variant_subpart; |
8599 | } | |
8600 | ||
032d1b71 EB |
8601 | /* Finish up the new variant and create the field. No need for debug |
8602 | info thanks to the XVS type. */ | |
8603 | finish_record_type (new_variant, nreverse (field_list), 2, false); | |
95c1c4bb | 8604 | compute_record_mode (new_variant); |
95c1c4bb EB |
8605 | create_type_decl (TYPE_NAME (new_variant), new_variant, NULL, |
8606 | true, false, Empty); | |
8607 | ||
8608 | new_field | |
8609 | = create_field_decl_from (old_field, new_variant, new_union_type, | |
8610 | TYPE_SIZE (new_variant), | |
8611 | pos_list, subst_list); | |
fb7fb701 | 8612 | DECL_QUALIFIER (new_field) = v->qual; |
95c1c4bb | 8613 | DECL_INTERNAL_P (new_field) = 1; |
910ad8de | 8614 | DECL_CHAIN (new_field) = union_field_list; |
95c1c4bb EB |
8615 | union_field_list = new_field; |
8616 | } | |
8617 | ||
032d1b71 EB |
8618 | /* Finish up the union type and create the variant part. No need for debug |
8619 | info thanks to the XVS type. */ | |
8620 | finish_record_type (new_union_type, union_field_list, 2, false); | |
95c1c4bb | 8621 | compute_record_mode (new_union_type); |
95c1c4bb EB |
8622 | create_type_decl (TYPE_NAME (new_union_type), new_union_type, NULL, |
8623 | true, false, Empty); | |
8624 | ||
8625 | new_variant_part | |
8626 | = create_field_decl_from (old_variant_part, new_union_type, record_type, | |
8627 | TYPE_SIZE (new_union_type), | |
8628 | pos_list, subst_list); | |
8629 | DECL_INTERNAL_P (new_variant_part) = 1; | |
8630 | ||
8631 | /* With multiple discriminants it is possible for an inner variant to be | |
8632 | statically selected while outer ones are not; in this case, the list | |
8633 | of fields of the inner variant is not flattened and we end up with a | |
8634 | qualified union with a single member. Drop the useless container. */ | |
910ad8de | 8635 | if (!DECL_CHAIN (union_field_list)) |
95c1c4bb EB |
8636 | { |
8637 | DECL_CONTEXT (union_field_list) = record_type; | |
8638 | DECL_FIELD_OFFSET (union_field_list) | |
8639 | = DECL_FIELD_OFFSET (new_variant_part); | |
8640 | DECL_FIELD_BIT_OFFSET (union_field_list) | |
8641 | = DECL_FIELD_BIT_OFFSET (new_variant_part); | |
8642 | SET_DECL_OFFSET_ALIGN (union_field_list, | |
8643 | DECL_OFFSET_ALIGN (new_variant_part)); | |
8644 | new_variant_part = union_field_list; | |
8645 | } | |
8646 | ||
8647 | return new_variant_part; | |
8648 | } | |
8649 | ||
8650 | /* Copy the size (and alignment and alias set) from OLD_TYPE to NEW_TYPE, | |
8651 | which are both RECORD_TYPE, after applying the substitutions described | |
8652 | in SUBST_LIST. */ | |
8653 | ||
8654 | static void | |
e3554601 NF |
8655 | copy_and_substitute_in_size (tree new_type, tree old_type, |
8656 | VEC(subst_pair,heap) *subst_list) | |
95c1c4bb | 8657 | { |
e3554601 NF |
8658 | unsigned ix; |
8659 | subst_pair *s; | |
95c1c4bb EB |
8660 | |
8661 | TYPE_SIZE (new_type) = TYPE_SIZE (old_type); | |
8662 | TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (old_type); | |
8663 | SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (old_type)); | |
8664 | TYPE_ALIGN (new_type) = TYPE_ALIGN (old_type); | |
8665 | relate_alias_sets (new_type, old_type, ALIAS_SET_COPY); | |
8666 | ||
8667 | if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (new_type))) | |
e3554601 | 8668 | FOR_EACH_VEC_ELT_REVERSE (subst_pair, subst_list, ix, s) |
95c1c4bb EB |
8669 | TYPE_SIZE (new_type) |
8670 | = SUBSTITUTE_IN_EXPR (TYPE_SIZE (new_type), | |
e3554601 | 8671 | s->discriminant, s->replacement); |
95c1c4bb EB |
8672 | |
8673 | if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (new_type))) | |
e3554601 | 8674 | FOR_EACH_VEC_ELT_REVERSE (subst_pair, subst_list, ix, s) |
95c1c4bb EB |
8675 | TYPE_SIZE_UNIT (new_type) |
8676 | = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (new_type), | |
e3554601 | 8677 | s->discriminant, s->replacement); |
95c1c4bb EB |
8678 | |
8679 | if (CONTAINS_PLACEHOLDER_P (TYPE_ADA_SIZE (new_type))) | |
e3554601 | 8680 | FOR_EACH_VEC_ELT_REVERSE (subst_pair, subst_list, ix, s) |
95c1c4bb EB |
8681 | SET_TYPE_ADA_SIZE |
8682 | (new_type, SUBSTITUTE_IN_EXPR (TYPE_ADA_SIZE (new_type), | |
e3554601 | 8683 | s->discriminant, s->replacement)); |
95c1c4bb EB |
8684 | |
8685 | /* Finalize the size. */ | |
8686 | TYPE_SIZE (new_type) = variable_size (TYPE_SIZE (new_type)); | |
8687 | TYPE_SIZE_UNIT (new_type) = variable_size (TYPE_SIZE_UNIT (new_type)); | |
8688 | } | |
8689 | \f | |
77022fa8 EB |
8690 | /* Given a type T, a FIELD_DECL F, and a replacement value R, return a |
8691 | type with all size expressions that contain F in a PLACEHOLDER_EXPR | |
8692 | updated by replacing F with R. | |
8693 | ||
8694 | The function doesn't update the layout of the type, i.e. it assumes | |
8695 | that the substitution is purely formal. That's why the replacement | |
8696 | value R must itself contain a PLACEHOLDER_EXPR. */ | |
a1ab4c31 AC |
8697 | |
8698 | tree | |
8699 | substitute_in_type (tree t, tree f, tree r) | |
8700 | { | |
c6bd4220 | 8701 | tree nt; |
77022fa8 EB |
8702 | |
8703 | gcc_assert (CONTAINS_PLACEHOLDER_P (r)); | |
a1ab4c31 AC |
8704 | |
8705 | switch (TREE_CODE (t)) | |
8706 | { | |
8707 | case INTEGER_TYPE: | |
8708 | case ENUMERAL_TYPE: | |
8709 | case BOOLEAN_TYPE: | |
a531043b | 8710 | case REAL_TYPE: |
84fb43a1 EB |
8711 | |
8712 | /* First the domain types of arrays. */ | |
8713 | if (CONTAINS_PLACEHOLDER_P (TYPE_GCC_MIN_VALUE (t)) | |
8714 | || CONTAINS_PLACEHOLDER_P (TYPE_GCC_MAX_VALUE (t))) | |
a1ab4c31 | 8715 | { |
84fb43a1 EB |
8716 | tree low = SUBSTITUTE_IN_EXPR (TYPE_GCC_MIN_VALUE (t), f, r); |
8717 | tree high = SUBSTITUTE_IN_EXPR (TYPE_GCC_MAX_VALUE (t), f, r); | |
a1ab4c31 | 8718 | |
84fb43a1 | 8719 | if (low == TYPE_GCC_MIN_VALUE (t) && high == TYPE_GCC_MAX_VALUE (t)) |
a1ab4c31 AC |
8720 | return t; |
8721 | ||
c6bd4220 EB |
8722 | nt = copy_type (t); |
8723 | TYPE_GCC_MIN_VALUE (nt) = low; | |
8724 | TYPE_GCC_MAX_VALUE (nt) = high; | |
a531043b EB |
8725 | |
8726 | if (TREE_CODE (t) == INTEGER_TYPE && TYPE_INDEX_TYPE (t)) | |
a1ab4c31 | 8727 | SET_TYPE_INDEX_TYPE |
c6bd4220 | 8728 | (nt, substitute_in_type (TYPE_INDEX_TYPE (t), f, r)); |
a1ab4c31 | 8729 | |
c6bd4220 | 8730 | return nt; |
a1ab4c31 | 8731 | } |
77022fa8 | 8732 | |
84fb43a1 EB |
8733 | /* Then the subtypes. */ |
8734 | if (CONTAINS_PLACEHOLDER_P (TYPE_RM_MIN_VALUE (t)) | |
8735 | || CONTAINS_PLACEHOLDER_P (TYPE_RM_MAX_VALUE (t))) | |
8736 | { | |
8737 | tree low = SUBSTITUTE_IN_EXPR (TYPE_RM_MIN_VALUE (t), f, r); | |
8738 | tree high = SUBSTITUTE_IN_EXPR (TYPE_RM_MAX_VALUE (t), f, r); | |
8739 | ||
8740 | if (low == TYPE_RM_MIN_VALUE (t) && high == TYPE_RM_MAX_VALUE (t)) | |
8741 | return t; | |
8742 | ||
c6bd4220 EB |
8743 | nt = copy_type (t); |
8744 | SET_TYPE_RM_MIN_VALUE (nt, low); | |
8745 | SET_TYPE_RM_MAX_VALUE (nt, high); | |
84fb43a1 | 8746 | |
c6bd4220 | 8747 | return nt; |
84fb43a1 EB |
8748 | } |
8749 | ||
a1ab4c31 AC |
8750 | return t; |
8751 | ||
8752 | case COMPLEX_TYPE: | |
c6bd4220 EB |
8753 | nt = substitute_in_type (TREE_TYPE (t), f, r); |
8754 | if (nt == TREE_TYPE (t)) | |
a1ab4c31 AC |
8755 | return t; |
8756 | ||
c6bd4220 | 8757 | return build_complex_type (nt); |
a1ab4c31 | 8758 | |
a1ab4c31 | 8759 | case FUNCTION_TYPE: |
77022fa8 | 8760 | /* These should never show up here. */ |
a1ab4c31 AC |
8761 | gcc_unreachable (); |
8762 | ||
8763 | case ARRAY_TYPE: | |
8764 | { | |
8765 | tree component = substitute_in_type (TREE_TYPE (t), f, r); | |
8766 | tree domain = substitute_in_type (TYPE_DOMAIN (t), f, r); | |
8767 | ||
8768 | if (component == TREE_TYPE (t) && domain == TYPE_DOMAIN (t)) | |
8769 | return t; | |
8770 | ||
523e82a7 | 8771 | nt = build_nonshared_array_type (component, domain); |
c6bd4220 EB |
8772 | TYPE_ALIGN (nt) = TYPE_ALIGN (t); |
8773 | TYPE_USER_ALIGN (nt) = TYPE_USER_ALIGN (t); | |
8774 | SET_TYPE_MODE (nt, TYPE_MODE (t)); | |
8775 | TYPE_SIZE (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r); | |
8776 | TYPE_SIZE_UNIT (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r); | |
8777 | TYPE_NONALIASED_COMPONENT (nt) = TYPE_NONALIASED_COMPONENT (t); | |
8778 | TYPE_MULTI_ARRAY_P (nt) = TYPE_MULTI_ARRAY_P (t); | |
8779 | TYPE_CONVENTION_FORTRAN_P (nt) = TYPE_CONVENTION_FORTRAN_P (t); | |
8780 | return nt; | |
a1ab4c31 AC |
8781 | } |
8782 | ||
8783 | case RECORD_TYPE: | |
8784 | case UNION_TYPE: | |
8785 | case QUAL_UNION_TYPE: | |
8786 | { | |
77022fa8 | 8787 | bool changed_field = false; |
a1ab4c31 | 8788 | tree field; |
a1ab4c31 AC |
8789 | |
8790 | /* Start out with no fields, make new fields, and chain them | |
8791 | in. If we haven't actually changed the type of any field, | |
8792 | discard everything we've done and return the old type. */ | |
c6bd4220 EB |
8793 | nt = copy_type (t); |
8794 | TYPE_FIELDS (nt) = NULL_TREE; | |
a1ab4c31 | 8795 | |
910ad8de | 8796 | for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field)) |
a1ab4c31 | 8797 | { |
77022fa8 EB |
8798 | tree new_field = copy_node (field), new_n; |
8799 | ||
8800 | new_n = substitute_in_type (TREE_TYPE (field), f, r); | |
8801 | if (new_n != TREE_TYPE (field)) | |
a1ab4c31 | 8802 | { |
77022fa8 EB |
8803 | TREE_TYPE (new_field) = new_n; |
8804 | changed_field = true; | |
8805 | } | |
a1ab4c31 | 8806 | |
77022fa8 EB |
8807 | new_n = SUBSTITUTE_IN_EXPR (DECL_FIELD_OFFSET (field), f, r); |
8808 | if (new_n != DECL_FIELD_OFFSET (field)) | |
8809 | { | |
8810 | DECL_FIELD_OFFSET (new_field) = new_n; | |
8811 | changed_field = true; | |
8812 | } | |
a1ab4c31 | 8813 | |
77022fa8 EB |
8814 | /* Do the substitution inside the qualifier, if any. */ |
8815 | if (TREE_CODE (t) == QUAL_UNION_TYPE) | |
8816 | { | |
8817 | new_n = SUBSTITUTE_IN_EXPR (DECL_QUALIFIER (field), f, r); | |
8818 | if (new_n != DECL_QUALIFIER (field)) | |
8819 | { | |
8820 | DECL_QUALIFIER (new_field) = new_n; | |
8821 | changed_field = true; | |
a1ab4c31 AC |
8822 | } |
8823 | } | |
8824 | ||
c6bd4220 | 8825 | DECL_CONTEXT (new_field) = nt; |
cb3d597d | 8826 | SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, field); |
a1ab4c31 | 8827 | |
910ad8de | 8828 | DECL_CHAIN (new_field) = TYPE_FIELDS (nt); |
c6bd4220 | 8829 | TYPE_FIELDS (nt) = new_field; |
a1ab4c31 AC |
8830 | } |
8831 | ||
77022fa8 | 8832 | if (!changed_field) |
a1ab4c31 AC |
8833 | return t; |
8834 | ||
c6bd4220 EB |
8835 | TYPE_FIELDS (nt) = nreverse (TYPE_FIELDS (nt)); |
8836 | TYPE_SIZE (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r); | |
8837 | TYPE_SIZE_UNIT (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r); | |
8838 | SET_TYPE_ADA_SIZE (nt, SUBSTITUTE_IN_EXPR (TYPE_ADA_SIZE (t), f, r)); | |
8839 | return nt; | |
a1ab4c31 AC |
8840 | } |
8841 | ||
8842 | default: | |
8843 | return t; | |
8844 | } | |
8845 | } | |
8846 | \f | |
b4680ca1 | 8847 | /* Return the RM size of GNU_TYPE. This is the actual number of bits |
a1ab4c31 AC |
8848 | needed to represent the object. */ |
8849 | ||
8850 | tree | |
8851 | rm_size (tree gnu_type) | |
8852 | { | |
e6e15ec9 | 8853 | /* For integral types, we store the RM size explicitly. */ |
a1ab4c31 AC |
8854 | if (INTEGRAL_TYPE_P (gnu_type) && TYPE_RM_SIZE (gnu_type)) |
8855 | return TYPE_RM_SIZE (gnu_type); | |
b4680ca1 EB |
8856 | |
8857 | /* Return the RM size of the actual data plus the size of the template. */ | |
8858 | if (TREE_CODE (gnu_type) == RECORD_TYPE | |
8859 | && TYPE_CONTAINS_TEMPLATE_P (gnu_type)) | |
a1ab4c31 AC |
8860 | return |
8861 | size_binop (PLUS_EXPR, | |
910ad8de | 8862 | rm_size (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (gnu_type)))), |
a1ab4c31 | 8863 | DECL_SIZE (TYPE_FIELDS (gnu_type))); |
b4680ca1 EB |
8864 | |
8865 | /* For record types, we store the size explicitly. */ | |
8866 | if ((TREE_CODE (gnu_type) == RECORD_TYPE | |
8867 | || TREE_CODE (gnu_type) == UNION_TYPE | |
8868 | || TREE_CODE (gnu_type) == QUAL_UNION_TYPE) | |
315cff15 | 8869 | && !TYPE_FAT_POINTER_P (gnu_type) |
b4680ca1 | 8870 | && TYPE_ADA_SIZE (gnu_type)) |
a1ab4c31 | 8871 | return TYPE_ADA_SIZE (gnu_type); |
b4680ca1 EB |
8872 | |
8873 | /* For other types, this is just the size. */ | |
8874 | return TYPE_SIZE (gnu_type); | |
a1ab4c31 AC |
8875 | } |
8876 | \f | |
0fb2335d EB |
8877 | /* Return the name to be used for GNAT_ENTITY. If a type, create a |
8878 | fully-qualified name, possibly with type information encoding. | |
8879 | Otherwise, return the name. */ | |
8880 | ||
8881 | tree | |
8882 | get_entity_name (Entity_Id gnat_entity) | |
8883 | { | |
8884 | Get_Encoded_Name (gnat_entity); | |
8885 | return get_identifier_with_length (Name_Buffer, Name_Len); | |
8886 | } | |
8887 | ||
a1ab4c31 AC |
8888 | /* Return an identifier representing the external name to be used for |
8889 | GNAT_ENTITY. If SUFFIX is specified, the name is followed by "___" | |
8890 | and the specified suffix. */ | |
8891 | ||
8892 | tree | |
8893 | create_concat_name (Entity_Id gnat_entity, const char *suffix) | |
8894 | { | |
8895 | Entity_Kind kind = Ekind (gnat_entity); | |
8896 | ||
0fb2335d EB |
8897 | if (suffix) |
8898 | { | |
8899 | String_Template temp = {1, strlen (suffix)}; | |
8900 | Fat_Pointer fp = {suffix, &temp}; | |
8901 | Get_External_Name_With_Suffix (gnat_entity, fp); | |
8902 | } | |
8903 | else | |
8904 | Get_External_Name (gnat_entity, 0); | |
a1ab4c31 | 8905 | |
0fb2335d EB |
8906 | /* A variable using the Stdcall convention lives in a DLL. We adjust |
8907 | its name to use the jump table, the _imp__NAME contains the address | |
8908 | for the NAME variable. */ | |
a1ab4c31 AC |
8909 | if ((kind == E_Variable || kind == E_Constant) |
8910 | && Has_Stdcall_Convention (gnat_entity)) | |
8911 | { | |
0fb2335d EB |
8912 | const int len = 6 + Name_Len; |
8913 | char *new_name = (char *) alloca (len + 1); | |
8914 | strcpy (new_name, "_imp__"); | |
8915 | strcat (new_name, Name_Buffer); | |
8916 | return get_identifier_with_length (new_name, len); | |
a1ab4c31 AC |
8917 | } |
8918 | ||
0fb2335d | 8919 | return get_identifier_with_length (Name_Buffer, Name_Len); |
a1ab4c31 AC |
8920 | } |
8921 | ||
0fb2335d | 8922 | /* Given GNU_NAME, an IDENTIFIER_NODE containing a name and SUFFIX, a |
a1ab4c31 | 8923 | string, return a new IDENTIFIER_NODE that is the concatenation of |
0fb2335d | 8924 | the name followed by "___" and the specified suffix. */ |
a1ab4c31 AC |
8925 | |
8926 | tree | |
0fb2335d | 8927 | concat_name (tree gnu_name, const char *suffix) |
a1ab4c31 | 8928 | { |
0fb2335d EB |
8929 | const int len = IDENTIFIER_LENGTH (gnu_name) + 3 + strlen (suffix); |
8930 | char *new_name = (char *) alloca (len + 1); | |
8931 | strcpy (new_name, IDENTIFIER_POINTER (gnu_name)); | |
8932 | strcat (new_name, "___"); | |
8933 | strcat (new_name, suffix); | |
8934 | return get_identifier_with_length (new_name, len); | |
a1ab4c31 AC |
8935 | } |
8936 | ||
8937 | #include "gt-ada-decl.h" |