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27becfc8 | 1 | /**************************************************************************** |
2 | * * | |
3 | * GNAT COMPILER COMPONENTS * | |
4 | * * | |
5 | * D E C L * | |
6 | * * | |
7 | * C Implementation File * | |
8 | * * | |
cfaf579d | 9 | * Copyright (C) 1992-2009, Free Software Foundation, Inc. * |
27becfc8 | 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" | |
27becfc8 | 33 | #include "ggc.h" |
27becfc8 | 34 | #include "target.h" |
35 | #include "expr.h" | |
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" | |
27becfc8 | 50 | #include "ada-tree.h" |
51 | #include "gigi.h" | |
52 | ||
53 | #ifndef MAX_FIXED_MODE_SIZE | |
54 | #define MAX_FIXED_MODE_SIZE GET_MODE_BITSIZE (DImode) | |
55 | #endif | |
56 | ||
57 | /* Convention_Stdcall should be processed in a specific way on Windows targets | |
58 | only. The macro below is a helper to avoid having to check for a Windows | |
59 | specific attribute throughout this unit. */ | |
60 | ||
61 | #if TARGET_DLLIMPORT_DECL_ATTRIBUTES | |
62 | #define Has_Stdcall_Convention(E) (Convention (E) == Convention_Stdcall) | |
63 | #else | |
64 | #define Has_Stdcall_Convention(E) (0) | |
65 | #endif | |
66 | ||
67 | /* Stack realignment for functions with foreign conventions is provided on a | |
68 | per back-end basis now, as it is handled by the prologue expanders and not | |
69 | as part of the function's body any more. It might be requested by way of a | |
70 | dedicated function type attribute on the targets that support it. | |
71 | ||
72 | We need a way to avoid setting the attribute on the targets that don't | |
73 | support it and use FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN for this purpose. | |
74 | ||
75 | It is defined on targets where the circuitry is available, and indicates | |
ea5ec53d | 76 | whether the realignment is needed for 'main'. We use this to decide for |
27becfc8 | 77 | foreign subprograms as well. |
78 | ||
79 | It is not defined on targets where the circuitry is not implemented, and | |
80 | we just never set the attribute in these cases. | |
81 | ||
82 | Whether it is defined on all targets that would need it in theory is | |
83 | not entirely clear. We currently trust the base GCC settings for this | |
84 | purpose. */ | |
85 | ||
86 | #ifndef FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN | |
87 | #define FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN 0 | |
88 | #endif | |
89 | ||
90 | struct incomplete | |
91 | { | |
92 | struct incomplete *next; | |
93 | tree old_type; | |
94 | Entity_Id full_type; | |
95 | }; | |
96 | ||
97 | /* These variables are used to defer recursively expanding incomplete types | |
98 | while we are processing an array, a record or a subprogram type. */ | |
99 | static int defer_incomplete_level = 0; | |
100 | static struct incomplete *defer_incomplete_list; | |
101 | ||
102 | /* This variable is used to delay expanding From_With_Type types until the | |
103 | end of the spec. */ | |
104 | static struct incomplete *defer_limited_with; | |
105 | ||
106 | /* These variables are used to defer finalizing types. The element of the | |
107 | list is the TYPE_DECL associated with the type. */ | |
108 | static int defer_finalize_level = 0; | |
109 | static VEC (tree,heap) *defer_finalize_list; | |
110 | ||
111 | /* A hash table used to cache the result of annotate_value. */ | |
112 | static GTY ((if_marked ("tree_int_map_marked_p"), | |
113 | param_is (struct tree_int_map))) htab_t annotate_value_cache; | |
114 | ||
892fdb03 | 115 | enum alias_set_op |
116 | { | |
117 | ALIAS_SET_COPY, | |
118 | ALIAS_SET_SUBSET, | |
119 | ALIAS_SET_SUPERSET | |
120 | }; | |
121 | ||
122 | static void relate_alias_sets (tree, tree, enum alias_set_op); | |
123 | ||
27becfc8 | 124 | static tree substitution_list (Entity_Id, Entity_Id, tree, bool); |
125 | static bool allocatable_size_p (tree, bool); | |
126 | static void prepend_one_attribute_to (struct attrib **, | |
127 | enum attr_type, tree, tree, Node_Id); | |
128 | static void prepend_attributes (Entity_Id, struct attrib **); | |
129 | static tree elaborate_expression (Node_Id, Entity_Id, tree, bool, bool, bool); | |
130 | static bool is_variable_size (tree); | |
dd02c1ab | 131 | static tree elaborate_expression_1 (tree, Entity_Id, tree, bool, bool); |
27becfc8 | 132 | static tree make_packable_type (tree, bool); |
133 | static tree gnat_to_gnu_field (Entity_Id, tree, int, bool); | |
134 | static tree gnat_to_gnu_param (Entity_Id, Mechanism_Type, Entity_Id, bool, | |
135 | bool *); | |
136 | static bool same_discriminant_p (Entity_Id, Entity_Id); | |
137 | static bool array_type_has_nonaliased_component (Entity_Id, tree); | |
27dd98d5 | 138 | static bool compile_time_known_address_p (Node_Id); |
27becfc8 | 139 | static void components_to_record (tree, Node_Id, tree, int, bool, tree *, |
140 | bool, bool, bool, bool); | |
141 | static Uint annotate_value (tree); | |
142 | static void annotate_rep (Entity_Id, tree); | |
143 | static tree compute_field_positions (tree, tree, tree, tree, unsigned int); | |
144 | static tree validate_size (Uint, tree, Entity_Id, enum tree_code, bool, bool); | |
145 | static void set_rm_size (Uint, tree, Entity_Id); | |
146 | static tree make_type_from_size (tree, tree, bool); | |
147 | static unsigned int validate_alignment (Uint, Entity_Id, unsigned int); | |
148 | static unsigned int ceil_alignment (unsigned HOST_WIDE_INT); | |
149 | static void check_ok_for_atomic (tree, Entity_Id, bool); | |
150 | static int compatible_signatures_p (tree ftype1, tree ftype2); | |
151 | static void rest_of_type_decl_compilation_no_defer (tree); | |
27becfc8 | 152 | \f |
153 | /* Given GNAT_ENTITY, a GNAT defining identifier node, which denotes some Ada | |
32826d65 | 154 | entity, return the equivalent GCC tree for that entity (a ..._DECL node) |
155 | and associate the ..._DECL node with the input GNAT defining identifier. | |
27becfc8 | 156 | |
157 | If GNAT_ENTITY is a variable or a constant declaration, GNU_EXPR gives its | |
32826d65 | 158 | initial value (in GCC tree form). This is optional for a variable. For |
159 | a renamed entity, GNU_EXPR gives the object being renamed. | |
27becfc8 | 160 | |
161 | DEFINITION is nonzero if this call is intended for a definition. This is | |
32826d65 | 162 | used for separate compilation where it is necessary to know whether an |
163 | external declaration or a definition must be created if the GCC equivalent | |
27becfc8 | 164 | was not created previously. The value of 1 is normally used for a nonzero |
165 | DEFINITION, but a value of 2 is used in special circumstances, defined in | |
166 | the code. */ | |
167 | ||
168 | tree | |
169 | gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, int definition) | |
170 | { | |
a002cb99 | 171 | /* Contains the kind of the input GNAT node. */ |
172 | const Entity_Kind kind = Ekind (gnat_entity); | |
173 | /* True if this is a type. */ | |
174 | const bool is_type = IN (kind, Type_Kind); | |
175 | /* For a type, contains the equivalent GNAT node to be used in gigi. */ | |
176 | Entity_Id gnat_equiv_type = Empty; | |
177 | /* Temporary used to walk the GNAT tree. */ | |
32826d65 | 178 | Entity_Id gnat_temp; |
32826d65 | 179 | /* Contains the GCC DECL node which is equivalent to the input GNAT node. |
180 | This node will be associated with the GNAT node by calling at the end | |
181 | of the `switch' statement. */ | |
27becfc8 | 182 | tree gnu_decl = NULL_TREE; |
32826d65 | 183 | /* Contains the GCC type to be used for the GCC node. */ |
184 | tree gnu_type = NULL_TREE; | |
185 | /* Contains the GCC size tree to be used for the GCC node. */ | |
186 | tree gnu_size = NULL_TREE; | |
187 | /* Contains the GCC name to be used for the GCC node. */ | |
e3698827 | 188 | tree gnu_entity_name; |
32826d65 | 189 | /* True if we have already saved gnu_decl as a GNAT association. */ |
27becfc8 | 190 | bool saved = false; |
32826d65 | 191 | /* True if we incremented defer_incomplete_level. */ |
27becfc8 | 192 | bool this_deferred = false; |
32826d65 | 193 | /* True if we incremented force_global. */ |
27becfc8 | 194 | bool this_global = false; |
32826d65 | 195 | /* True if we should check to see if elaborated during processing. */ |
27becfc8 | 196 | bool maybe_present = false; |
32826d65 | 197 | /* True if we made GNU_DECL and its type here. */ |
27becfc8 | 198 | bool this_made_decl = false; |
32826d65 | 199 | /* True if debug info is requested for this entity. */ |
27becfc8 | 200 | bool debug_info_p = (Needs_Debug_Info (gnat_entity) |
201 | || debug_info_level == DINFO_LEVEL_VERBOSE); | |
32826d65 | 202 | /* True if this entity is to be considered as imported. */ |
203 | bool imported_p = (Is_Imported (gnat_entity) | |
204 | && No (Address_Clause (gnat_entity))); | |
a002cb99 | 205 | /* Size and alignment of the GCC node, if meaningful. */ |
206 | unsigned int esize = 0, align = 0; | |
207 | /* Contains the list of attributes directly attached to the entity. */ | |
32826d65 | 208 | struct attrib *attr_list = NULL; |
27becfc8 | 209 | |
210 | /* Since a use of an Itype is a definition, process it as such if it | |
ea5ec53d | 211 | is not in a with'ed unit. */ |
32826d65 | 212 | if (!definition |
a002cb99 | 213 | && is_type |
32826d65 | 214 | && Is_Itype (gnat_entity) |
27becfc8 | 215 | && !present_gnu_tree (gnat_entity) |
216 | && In_Extended_Main_Code_Unit (gnat_entity)) | |
217 | { | |
32826d65 | 218 | /* Ensure that we are in a subprogram mentioned in the Scope chain of |
219 | this entity, our current scope is global, or we encountered a task | |
220 | or entry (where we can't currently accurately check scoping). */ | |
27becfc8 | 221 | if (!current_function_decl |
222 | || DECL_ELABORATION_PROC_P (current_function_decl)) | |
223 | { | |
224 | process_type (gnat_entity); | |
225 | return get_gnu_tree (gnat_entity); | |
226 | } | |
227 | ||
228 | for (gnat_temp = Scope (gnat_entity); | |
32826d65 | 229 | Present (gnat_temp); |
230 | gnat_temp = Scope (gnat_temp)) | |
27becfc8 | 231 | { |
232 | if (Is_Type (gnat_temp)) | |
233 | gnat_temp = Underlying_Type (gnat_temp); | |
234 | ||
235 | if (Ekind (gnat_temp) == E_Subprogram_Body) | |
236 | gnat_temp | |
237 | = Corresponding_Spec (Parent (Declaration_Node (gnat_temp))); | |
238 | ||
239 | if (IN (Ekind (gnat_temp), Subprogram_Kind) | |
240 | && Present (Protected_Body_Subprogram (gnat_temp))) | |
241 | gnat_temp = Protected_Body_Subprogram (gnat_temp); | |
242 | ||
243 | if (Ekind (gnat_temp) == E_Entry | |
244 | || Ekind (gnat_temp) == E_Entry_Family | |
245 | || Ekind (gnat_temp) == E_Task_Type | |
246 | || (IN (Ekind (gnat_temp), Subprogram_Kind) | |
247 | && present_gnu_tree (gnat_temp) | |
248 | && (current_function_decl | |
249 | == gnat_to_gnu_entity (gnat_temp, NULL_TREE, 0)))) | |
250 | { | |
251 | process_type (gnat_entity); | |
252 | return get_gnu_tree (gnat_entity); | |
253 | } | |
254 | } | |
255 | ||
a002cb99 | 256 | /* This abort means the Itype has an incorrect scope, i.e. that its |
32826d65 | 257 | scope does not correspond to the subprogram it is declared in. */ |
27becfc8 | 258 | gcc_unreachable (); |
259 | } | |
260 | ||
27becfc8 | 261 | /* If we've already processed this entity, return what we got last time. |
262 | If we are defining the node, we should not have already processed it. | |
32826d65 | 263 | In that case, we will abort below when we try to save a new GCC tree |
264 | for this object. We also need to handle the case of getting a dummy | |
265 | type when a Full_View exists. */ | |
a002cb99 | 266 | if ((!definition || (is_type && imported_p)) |
267 | && present_gnu_tree (gnat_entity)) | |
27becfc8 | 268 | { |
269 | gnu_decl = get_gnu_tree (gnat_entity); | |
270 | ||
271 | if (TREE_CODE (gnu_decl) == TYPE_DECL | |
272 | && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl)) | |
273 | && IN (kind, Incomplete_Or_Private_Kind) | |
274 | && Present (Full_View (gnat_entity))) | |
275 | { | |
32826d65 | 276 | gnu_decl |
277 | = gnat_to_gnu_entity (Full_View (gnat_entity), NULL_TREE, 0); | |
27becfc8 | 278 | save_gnu_tree (gnat_entity, NULL_TREE, false); |
279 | save_gnu_tree (gnat_entity, gnu_decl, false); | |
280 | } | |
281 | ||
282 | return gnu_decl; | |
283 | } | |
284 | ||
285 | /* If this is a numeric or enumeral type, or an access type, a nonzero | |
286 | Esize must be specified unless it was specified by the programmer. */ | |
287 | gcc_assert (!Unknown_Esize (gnat_entity) | |
288 | || Has_Size_Clause (gnat_entity) | |
32826d65 | 289 | || (!IN (kind, Numeric_Kind) |
290 | && !IN (kind, Enumeration_Kind) | |
27becfc8 | 291 | && (!IN (kind, Access_Kind) |
292 | || kind == E_Access_Protected_Subprogram_Type | |
293 | || kind == E_Anonymous_Access_Protected_Subprogram_Type | |
294 | || kind == E_Access_Subtype))); | |
295 | ||
153edb51 | 296 | /* The RM size must be specified for all discrete and fixed-point types. */ |
a002cb99 | 297 | gcc_assert (!(IN (kind, Discrete_Or_Fixed_Point_Kind) |
298 | && Unknown_RM_Size (gnat_entity))); | |
299 | ||
300 | /* If we get here, it means we have not yet done anything with this entity. | |
301 | If we are not defining it, it must be a type or an entity that is defined | |
302 | elsewhere or externally, otherwise we should have defined it already. */ | |
303 | gcc_assert (definition | |
304 | || type_annotate_only | |
305 | || is_type | |
306 | || kind == E_Discriminant | |
307 | || kind == E_Component | |
308 | || kind == E_Label | |
309 | || (kind == E_Constant && Present (Full_View (gnat_entity))) | |
310 | || Is_Public (gnat_entity)); | |
27becfc8 | 311 | |
312 | /* Get the name of the entity and set up the line number and filename of | |
313 | the original definition for use in any decl we make. */ | |
e3698827 | 314 | gnu_entity_name = get_entity_name (gnat_entity); |
27becfc8 | 315 | Sloc_to_locus (Sloc (gnat_entity), &input_location); |
316 | ||
27becfc8 | 317 | /* For cases when we are not defining (i.e., we are referencing from |
32826d65 | 318 | another compilation unit) public entities, show we are at global level |
27becfc8 | 319 | for the purpose of computing scopes. Don't do this for components or |
320 | discriminants since the relevant test is whether or not the record is | |
ee162cd7 | 321 | being defined. */ |
322 | if (!definition | |
ee162cd7 | 323 | && kind != E_Component |
a002cb99 | 324 | && kind != E_Discriminant |
325 | && Is_Public (gnat_entity) | |
326 | && !Is_Statically_Allocated (gnat_entity)) | |
27becfc8 | 327 | force_global++, this_global = true; |
328 | ||
329 | /* Handle any attributes directly attached to the entity. */ | |
330 | if (Has_Gigi_Rep_Item (gnat_entity)) | |
331 | prepend_attributes (gnat_entity, &attr_list); | |
332 | ||
a002cb99 | 333 | /* Do some common processing for types. */ |
334 | if (is_type) | |
335 | { | |
336 | /* Compute the equivalent type to be used in gigi. */ | |
337 | gnat_equiv_type = Gigi_Equivalent_Type (gnat_entity); | |
338 | ||
339 | /* Machine_Attributes on types are expected to be propagated to | |
340 | subtypes. The corresponding Gigi_Rep_Items are only attached | |
341 | to the first subtype though, so we handle the propagation here. */ | |
342 | if (Base_Type (gnat_entity) != gnat_entity | |
343 | && !Is_First_Subtype (gnat_entity) | |
344 | && Has_Gigi_Rep_Item (First_Subtype (Base_Type (gnat_entity)))) | |
345 | prepend_attributes (First_Subtype (Base_Type (gnat_entity)), | |
346 | &attr_list); | |
347 | ||
348 | /* Compute a default value for the size of the type. */ | |
349 | if (Known_Esize (gnat_entity) | |
350 | && UI_Is_In_Int_Range (Esize (gnat_entity))) | |
351 | { | |
352 | unsigned int max_esize; | |
353 | esize = UI_To_Int (Esize (gnat_entity)); | |
354 | ||
355 | if (IN (kind, Float_Kind)) | |
356 | max_esize = fp_prec_to_size (LONG_DOUBLE_TYPE_SIZE); | |
357 | else if (IN (kind, Access_Kind)) | |
358 | max_esize = POINTER_SIZE * 2; | |
359 | else | |
360 | max_esize = LONG_LONG_TYPE_SIZE; | |
361 | ||
4880a940 | 362 | if (esize > max_esize) |
363 | esize = max_esize; | |
a002cb99 | 364 | } |
365 | else | |
366 | esize = LONG_LONG_TYPE_SIZE; | |
367 | } | |
27becfc8 | 368 | |
369 | switch (kind) | |
370 | { | |
371 | case E_Constant: | |
d47e2843 | 372 | /* If this is a use of a deferred constant without address clause, |
373 | get its full definition. */ | |
374 | if (!definition | |
375 | && No (Address_Clause (gnat_entity)) | |
376 | && Present (Full_View (gnat_entity))) | |
27becfc8 | 377 | { |
d47e2843 | 378 | gnu_decl |
379 | = gnat_to_gnu_entity (Full_View (gnat_entity), gnu_expr, 0); | |
27becfc8 | 380 | saved = true; |
381 | break; | |
382 | } | |
383 | ||
384 | /* If we have an external constant that we are not defining, get the | |
385 | expression that is was defined to represent. We may throw that | |
386 | expression away later if it is not a constant. Do not retrieve the | |
387 | expression if it is an aggregate or allocator, because in complex | |
388 | instantiation contexts it may not be expanded */ | |
389 | if (!definition | |
390 | && Present (Expression (Declaration_Node (gnat_entity))) | |
391 | && !No_Initialization (Declaration_Node (gnat_entity)) | |
392 | && (Nkind (Expression (Declaration_Node (gnat_entity))) | |
393 | != N_Aggregate) | |
394 | && (Nkind (Expression (Declaration_Node (gnat_entity))) | |
395 | != N_Allocator)) | |
396 | gnu_expr = gnat_to_gnu (Expression (Declaration_Node (gnat_entity))); | |
397 | ||
d47e2843 | 398 | /* Ignore deferred constant definitions without address clause since |
399 | they are processed fully in the front-end. If No_Initialization | |
400 | is set, this is not a deferred constant but a constant whose value | |
401 | is built manually. And constants that are renamings are handled | |
402 | like variables. */ | |
403 | if (definition | |
404 | && !gnu_expr | |
405 | && No (Address_Clause (gnat_entity)) | |
27becfc8 | 406 | && !No_Initialization (Declaration_Node (gnat_entity)) |
407 | && No (Renamed_Object (gnat_entity))) | |
408 | { | |
409 | gnu_decl = error_mark_node; | |
410 | saved = true; | |
411 | break; | |
412 | } | |
d47e2843 | 413 | |
414 | /* Ignore constant definitions already marked with the error node. See | |
415 | the N_Object_Declaration case of gnat_to_gnu for the rationale. */ | |
416 | if (definition | |
417 | && gnu_expr | |
418 | && present_gnu_tree (gnat_entity) | |
419 | && get_gnu_tree (gnat_entity) == error_mark_node) | |
27becfc8 | 420 | { |
d47e2843 | 421 | maybe_present = true; |
27becfc8 | 422 | break; |
423 | } | |
424 | ||
425 | goto object; | |
426 | ||
427 | case E_Exception: | |
428 | /* We used to special case VMS exceptions here to directly map them to | |
429 | their associated condition code. Since this code had to be masked | |
430 | dynamically to strip off the severity bits, this caused trouble in | |
431 | the GCC/ZCX case because the "type" pointers we store in the tables | |
432 | have to be static. We now don't special case here anymore, and let | |
433 | the regular processing take place, which leaves us with a regular | |
434 | exception data object for VMS exceptions too. The condition code | |
435 | mapping is taken care of by the front end and the bitmasking by the | |
32826d65 | 436 | runtime library. */ |
27becfc8 | 437 | goto object; |
438 | ||
439 | case E_Discriminant: | |
440 | case E_Component: | |
441 | { | |
ea5ec53d | 442 | /* The GNAT record where the component was defined. */ |
27becfc8 | 443 | Entity_Id gnat_record = Underlying_Type (Scope (gnat_entity)); |
444 | ||
445 | /* If the variable is an inherited record component (in the case of | |
446 | extended record types), just return the inherited entity, which | |
447 | must be a FIELD_DECL. Likewise for discriminants. | |
448 | For discriminants of untagged records which have explicit | |
449 | stored discriminants, return the entity for the corresponding | |
450 | stored discriminant. Also use Original_Record_Component | |
451 | if the record has a private extension. */ | |
27becfc8 | 452 | if (Present (Original_Record_Component (gnat_entity)) |
453 | && Original_Record_Component (gnat_entity) != gnat_entity) | |
454 | { | |
455 | gnu_decl | |
456 | = gnat_to_gnu_entity (Original_Record_Component (gnat_entity), | |
457 | gnu_expr, definition); | |
458 | saved = true; | |
459 | break; | |
460 | } | |
461 | ||
462 | /* If the enclosing record has explicit stored discriminants, | |
463 | then it is an untagged record. If the Corresponding_Discriminant | |
464 | is not empty then this must be a renamed discriminant and its | |
465 | Original_Record_Component must point to the corresponding explicit | |
32826d65 | 466 | stored discriminant (i.e. we should have taken the previous |
27becfc8 | 467 | branch). */ |
27becfc8 | 468 | else if (Present (Corresponding_Discriminant (gnat_entity)) |
469 | && Is_Tagged_Type (gnat_record)) | |
470 | { | |
ea5ec53d | 471 | /* A tagged record has no explicit stored discriminants. */ |
27becfc8 | 472 | gcc_assert (First_Discriminant (gnat_record) |
473 | == First_Stored_Discriminant (gnat_record)); | |
474 | gnu_decl | |
475 | = gnat_to_gnu_entity (Corresponding_Discriminant (gnat_entity), | |
476 | gnu_expr, definition); | |
477 | saved = true; | |
478 | break; | |
479 | } | |
480 | ||
481 | else if (Present (CR_Discriminant (gnat_entity)) | |
482 | && type_annotate_only) | |
483 | { | |
484 | gnu_decl = gnat_to_gnu_entity (CR_Discriminant (gnat_entity), | |
485 | gnu_expr, definition); | |
486 | saved = true; | |
487 | break; | |
488 | } | |
489 | ||
ea5ec53d | 490 | /* If the enclosing record has explicit stored discriminants, then |
491 | it is an untagged record. If the Corresponding_Discriminant | |
27becfc8 | 492 | is not empty then this must be a renamed discriminant and its |
493 | Original_Record_Component must point to the corresponding explicit | |
32826d65 | 494 | stored discriminant (i.e. we should have taken the first |
27becfc8 | 495 | branch). */ |
27becfc8 | 496 | else if (Present (Corresponding_Discriminant (gnat_entity)) |
497 | && (First_Discriminant (gnat_record) | |
498 | != First_Stored_Discriminant (gnat_record))) | |
499 | gcc_unreachable (); | |
500 | ||
501 | /* Otherwise, if we are not defining this and we have no GCC type | |
502 | for the containing record, make one for it. Then we should | |
503 | have made our own equivalent. */ | |
504 | else if (!definition && !present_gnu_tree (gnat_record)) | |
505 | { | |
506 | /* ??? If this is in a record whose scope is a protected | |
507 | type and we have an Original_Record_Component, use it. | |
508 | This is a workaround for major problems in protected type | |
509 | handling. */ | |
510 | Entity_Id Scop = Scope (Scope (gnat_entity)); | |
511 | if ((Is_Protected_Type (Scop) | |
512 | || (Is_Private_Type (Scop) | |
513 | && Present (Full_View (Scop)) | |
514 | && Is_Protected_Type (Full_View (Scop)))) | |
515 | && Present (Original_Record_Component (gnat_entity))) | |
516 | { | |
517 | gnu_decl | |
518 | = gnat_to_gnu_entity (Original_Record_Component | |
519 | (gnat_entity), | |
520 | gnu_expr, 0); | |
521 | saved = true; | |
522 | break; | |
523 | } | |
524 | ||
525 | gnat_to_gnu_entity (Scope (gnat_entity), NULL_TREE, 0); | |
526 | gnu_decl = get_gnu_tree (gnat_entity); | |
527 | saved = true; | |
528 | break; | |
529 | } | |
530 | ||
531 | else | |
532 | /* Here we have no GCC type and this is a reference rather than a | |
ea5ec53d | 533 | definition. This should never happen. Most likely the cause is |
27becfc8 | 534 | reference before declaration in the gnat tree for gnat_entity. */ |
535 | gcc_unreachable (); | |
536 | } | |
537 | ||
538 | case E_Loop_Parameter: | |
539 | case E_Out_Parameter: | |
540 | case E_Variable: | |
541 | ||
542 | /* Simple variables, loop variables, Out parameters, and exceptions. */ | |
543 | object: | |
544 | { | |
545 | bool used_by_ref = false; | |
546 | bool const_flag | |
547 | = ((kind == E_Constant || kind == E_Variable) | |
548 | && Is_True_Constant (gnat_entity) | |
ee82d891 | 549 | && !Treat_As_Volatile (gnat_entity) |
27becfc8 | 550 | && (((Nkind (Declaration_Node (gnat_entity)) |
551 | == N_Object_Declaration) | |
552 | && Present (Expression (Declaration_Node (gnat_entity)))) | |
553 | || Present (Renamed_Object (gnat_entity)))); | |
554 | bool inner_const_flag = const_flag; | |
555 | bool static_p = Is_Statically_Allocated (gnat_entity); | |
556 | bool mutable_p = false; | |
557 | tree gnu_ext_name = NULL_TREE; | |
558 | tree renamed_obj = NULL_TREE; | |
559 | tree gnu_object_size; | |
560 | ||
561 | if (Present (Renamed_Object (gnat_entity)) && !definition) | |
562 | { | |
563 | if (kind == E_Exception) | |
564 | gnu_expr = gnat_to_gnu_entity (Renamed_Entity (gnat_entity), | |
565 | NULL_TREE, 0); | |
566 | else | |
567 | gnu_expr = gnat_to_gnu (Renamed_Object (gnat_entity)); | |
568 | } | |
569 | ||
570 | /* Get the type after elaborating the renamed object. */ | |
571 | gnu_type = gnat_to_gnu_type (Etype (gnat_entity)); | |
572 | ||
573 | /* For a debug renaming declaration, build a pure debug entity. */ | |
574 | if (Present (Debug_Renaming_Link (gnat_entity))) | |
575 | { | |
576 | rtx addr; | |
e3698827 | 577 | gnu_decl = build_decl (VAR_DECL, gnu_entity_name, gnu_type); |
27becfc8 | 578 | /* The (MEM (CONST (0))) pattern is prescribed by STABS. */ |
579 | if (global_bindings_p ()) | |
580 | addr = gen_rtx_CONST (VOIDmode, const0_rtx); | |
581 | else | |
582 | addr = stack_pointer_rtx; | |
583 | SET_DECL_RTL (gnu_decl, gen_rtx_MEM (Pmode, addr)); | |
584 | gnat_pushdecl (gnu_decl, gnat_entity); | |
585 | break; | |
586 | } | |
587 | ||
588 | /* If this is a loop variable, its type should be the base type. | |
589 | This is because the code for processing a loop determines whether | |
590 | a normal loop end test can be done by comparing the bounds of the | |
591 | loop against those of the base type, which is presumed to be the | |
592 | size used for computation. But this is not correct when the size | |
593 | of the subtype is smaller than the type. */ | |
594 | if (kind == E_Loop_Parameter) | |
595 | gnu_type = get_base_type (gnu_type); | |
596 | ||
597 | /* Reject non-renamed objects whose types are unconstrained arrays or | |
ea5ec53d | 598 | any object whose type is a dummy type or VOID_TYPE. */ |
27becfc8 | 599 | |
600 | if ((TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE | |
601 | && No (Renamed_Object (gnat_entity))) | |
602 | || TYPE_IS_DUMMY_P (gnu_type) | |
603 | || TREE_CODE (gnu_type) == VOID_TYPE) | |
604 | { | |
605 | gcc_assert (type_annotate_only); | |
606 | if (this_global) | |
607 | force_global--; | |
608 | return error_mark_node; | |
609 | } | |
610 | ||
611 | /* If an alignment is specified, use it if valid. Note that | |
612 | exceptions are objects but don't have alignments. We must do this | |
613 | before we validate the size, since the alignment can affect the | |
614 | size. */ | |
615 | if (kind != E_Exception && Known_Alignment (gnat_entity)) | |
616 | { | |
617 | gcc_assert (Present (Alignment (gnat_entity))); | |
618 | align = validate_alignment (Alignment (gnat_entity), gnat_entity, | |
619 | TYPE_ALIGN (gnu_type)); | |
620 | gnu_type = maybe_pad_type (gnu_type, NULL_TREE, align, gnat_entity, | |
621 | "PAD", false, definition, true); | |
622 | } | |
623 | ||
624 | /* If we are defining the object, see if it has a Size value and | |
ea5ec53d | 625 | validate it if so. If we are not defining the object and a Size |
626 | clause applies, simply retrieve the value. We don't want to ignore | |
27becfc8 | 627 | the clause and it is expected to have been validated already. Then |
628 | get the new type, if any. */ | |
629 | if (definition) | |
630 | gnu_size = validate_size (Esize (gnat_entity), gnu_type, | |
631 | gnat_entity, VAR_DECL, false, | |
632 | Has_Size_Clause (gnat_entity)); | |
633 | else if (Has_Size_Clause (gnat_entity)) | |
634 | gnu_size = UI_To_gnu (Esize (gnat_entity), bitsizetype); | |
635 | ||
636 | if (gnu_size) | |
637 | { | |
638 | gnu_type | |
639 | = make_type_from_size (gnu_type, gnu_size, | |
640 | Has_Biased_Representation (gnat_entity)); | |
641 | ||
642 | if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0)) | |
643 | gnu_size = NULL_TREE; | |
644 | } | |
645 | ||
646 | /* If this object has self-referential size, it must be a record with | |
647 | a default value. We are supposed to allocate an object of the | |
648 | maximum size in this case unless it is a constant with an | |
649 | initializing expression, in which case we can get the size from | |
650 | that. Note that the resulting size may still be a variable, so | |
651 | this may end up with an indirect allocation. */ | |
652 | if (No (Renamed_Object (gnat_entity)) | |
653 | && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))) | |
654 | { | |
655 | if (gnu_expr && kind == E_Constant) | |
656 | { | |
657 | tree size = TYPE_SIZE (TREE_TYPE (gnu_expr)); | |
658 | if (CONTAINS_PLACEHOLDER_P (size)) | |
659 | { | |
660 | /* If the initializing expression is itself a constant, | |
661 | despite having a nominal type with self-referential | |
662 | size, we can get the size directly from it. */ | |
663 | if (TREE_CODE (gnu_expr) == COMPONENT_REF | |
664 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_expr, 0))) | |
665 | == RECORD_TYPE | |
666 | && TYPE_IS_PADDING_P | |
667 | (TREE_TYPE (TREE_OPERAND (gnu_expr, 0))) | |
668 | && TREE_CODE (TREE_OPERAND (gnu_expr, 0)) == VAR_DECL | |
669 | && (TREE_READONLY (TREE_OPERAND (gnu_expr, 0)) | |
670 | || DECL_READONLY_ONCE_ELAB | |
671 | (TREE_OPERAND (gnu_expr, 0)))) | |
672 | gnu_size = DECL_SIZE (TREE_OPERAND (gnu_expr, 0)); | |
673 | else | |
674 | gnu_size | |
675 | = SUBSTITUTE_PLACEHOLDER_IN_EXPR (size, gnu_expr); | |
676 | } | |
677 | else | |
678 | gnu_size = size; | |
679 | } | |
680 | /* We may have no GNU_EXPR because No_Initialization is | |
681 | set even though there's an Expression. */ | |
682 | else if (kind == E_Constant | |
683 | && (Nkind (Declaration_Node (gnat_entity)) | |
684 | == N_Object_Declaration) | |
685 | && Present (Expression (Declaration_Node (gnat_entity)))) | |
686 | gnu_size | |
687 | = TYPE_SIZE (gnat_to_gnu_type | |
688 | (Etype | |
689 | (Expression (Declaration_Node (gnat_entity))))); | |
690 | else | |
691 | { | |
692 | gnu_size = max_size (TYPE_SIZE (gnu_type), true); | |
693 | mutable_p = true; | |
694 | } | |
695 | } | |
696 | ||
697 | /* If the size is zero bytes, make it one byte since some linkers have | |
698 | trouble with zero-sized objects. If the object will have a | |
699 | template, that will make it nonzero so don't bother. Also avoid | |
700 | doing that for an object renaming or an object with an address | |
701 | clause, as we would lose useful information on the view size | |
702 | (e.g. for null array slices) and we are not allocating the object | |
703 | here anyway. */ | |
704 | if (((gnu_size | |
705 | && integer_zerop (gnu_size) | |
706 | && !TREE_OVERFLOW (gnu_size)) | |
707 | || (TYPE_SIZE (gnu_type) | |
708 | && integer_zerop (TYPE_SIZE (gnu_type)) | |
709 | && !TREE_OVERFLOW (TYPE_SIZE (gnu_type)))) | |
710 | && (!Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity)) | |
711 | || !Is_Array_Type (Etype (gnat_entity))) | |
a002cb99 | 712 | && No (Renamed_Object (gnat_entity)) |
713 | && No (Address_Clause (gnat_entity))) | |
27becfc8 | 714 | gnu_size = bitsize_unit_node; |
715 | ||
716 | /* If this is an object with no specified size and alignment, and | |
717 | if either it is atomic or we are not optimizing alignment for | |
718 | space and it is composite and not an exception, an Out parameter | |
719 | or a reference to another object, and the size of its type is a | |
720 | constant, set the alignment to the smallest one which is not | |
721 | smaller than the size, with an appropriate cap. */ | |
722 | if (!gnu_size && align == 0 | |
723 | && (Is_Atomic (gnat_entity) | |
724 | || (!Optimize_Alignment_Space (gnat_entity) | |
725 | && kind != E_Exception | |
726 | && kind != E_Out_Parameter | |
727 | && Is_Composite_Type (Etype (gnat_entity)) | |
728 | && !Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity)) | |
729 | && !imported_p | |
730 | && No (Renamed_Object (gnat_entity)) | |
731 | && No (Address_Clause (gnat_entity)))) | |
732 | && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST) | |
733 | { | |
734 | /* No point in jumping through all the hoops needed in order | |
2096ca9c | 735 | to support BIGGEST_ALIGNMENT if we don't really have to. |
736 | So we cap to the smallest alignment that corresponds to | |
737 | a known efficient memory access pattern of the target. */ | |
27becfc8 | 738 | unsigned int align_cap = Is_Atomic (gnat_entity) |
739 | ? BIGGEST_ALIGNMENT | |
2096ca9c | 740 | : get_mode_alignment (ptr_mode); |
27becfc8 | 741 | |
742 | if (!host_integerp (TYPE_SIZE (gnu_type), 1) | |
743 | || compare_tree_int (TYPE_SIZE (gnu_type), align_cap) >= 0) | |
744 | align = align_cap; | |
745 | else | |
746 | align = ceil_alignment (tree_low_cst (TYPE_SIZE (gnu_type), 1)); | |
747 | ||
748 | /* But make sure not to under-align the object. */ | |
749 | if (align <= TYPE_ALIGN (gnu_type)) | |
750 | align = 0; | |
751 | ||
752 | /* And honor the minimum valid atomic alignment, if any. */ | |
753 | #ifdef MINIMUM_ATOMIC_ALIGNMENT | |
754 | else if (align < MINIMUM_ATOMIC_ALIGNMENT) | |
755 | align = MINIMUM_ATOMIC_ALIGNMENT; | |
756 | #endif | |
757 | } | |
758 | ||
759 | /* If the object is set to have atomic components, find the component | |
760 | type and validate it. | |
761 | ||
762 | ??? Note that we ignore Has_Volatile_Components on objects; it's | |
ea5ec53d | 763 | not at all clear what to do in that case. */ |
27becfc8 | 764 | |
765 | if (Has_Atomic_Components (gnat_entity)) | |
766 | { | |
767 | tree gnu_inner = (TREE_CODE (gnu_type) == ARRAY_TYPE | |
768 | ? TREE_TYPE (gnu_type) : gnu_type); | |
769 | ||
770 | while (TREE_CODE (gnu_inner) == ARRAY_TYPE | |
771 | && TYPE_MULTI_ARRAY_P (gnu_inner)) | |
772 | gnu_inner = TREE_TYPE (gnu_inner); | |
773 | ||
774 | check_ok_for_atomic (gnu_inner, gnat_entity, true); | |
775 | } | |
776 | ||
777 | /* Now check if the type of the object allows atomic access. Note | |
778 | that we must test the type, even if this object has size and | |
779 | alignment to allow such access, because we will be going | |
780 | inside the padded record to assign to the object. We could fix | |
781 | this by always copying via an intermediate value, but it's not | |
782 | clear it's worth the effort. */ | |
783 | if (Is_Atomic (gnat_entity)) | |
784 | check_ok_for_atomic (gnu_type, gnat_entity, false); | |
785 | ||
786 | /* If this is an aliased object with an unconstrained nominal subtype, | |
787 | make a type that includes the template. */ | |
788 | if (Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity)) | |
789 | && Is_Array_Type (Etype (gnat_entity)) | |
790 | && !type_annotate_only) | |
791 | { | |
792 | tree gnu_fat | |
793 | = TREE_TYPE (gnat_to_gnu_type (Base_Type (Etype (gnat_entity)))); | |
794 | ||
795 | gnu_type | |
796 | = build_unc_object_type_from_ptr (gnu_fat, gnu_type, | |
e3698827 | 797 | concat_name (gnu_entity_name, |
798 | "UNC")); | |
27becfc8 | 799 | } |
800 | ||
801 | #ifdef MINIMUM_ATOMIC_ALIGNMENT | |
802 | /* If the size is a constant and no alignment is specified, force | |
803 | the alignment to be the minimum valid atomic alignment. The | |
804 | restriction on constant size avoids problems with variable-size | |
805 | temporaries; if the size is variable, there's no issue with | |
806 | atomic access. Also don't do this for a constant, since it isn't | |
807 | necessary and can interfere with constant replacement. Finally, | |
808 | do not do it for Out parameters since that creates an | |
809 | size inconsistency with In parameters. */ | |
810 | if (align == 0 && MINIMUM_ATOMIC_ALIGNMENT > TYPE_ALIGN (gnu_type) | |
811 | && !FLOAT_TYPE_P (gnu_type) | |
812 | && !const_flag && No (Renamed_Object (gnat_entity)) | |
813 | && !imported_p && No (Address_Clause (gnat_entity)) | |
814 | && kind != E_Out_Parameter | |
815 | && (gnu_size ? TREE_CODE (gnu_size) == INTEGER_CST | |
816 | : TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST)) | |
817 | align = MINIMUM_ATOMIC_ALIGNMENT; | |
818 | #endif | |
819 | ||
820 | /* Make a new type with the desired size and alignment, if needed. | |
821 | But do not take into account alignment promotions to compute the | |
822 | size of the object. */ | |
823 | gnu_object_size = gnu_size ? gnu_size : TYPE_SIZE (gnu_type); | |
824 | if (gnu_size || align > 0) | |
825 | gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity, | |
826 | "PAD", false, definition, | |
827 | gnu_size ? true : false); | |
828 | ||
27becfc8 | 829 | /* If this is a renaming, avoid as much as possible to create a new |
830 | object. However, in several cases, creating it is required. | |
831 | This processing needs to be applied to the raw expression so | |
832 | as to make it more likely to rename the underlying object. */ | |
833 | if (Present (Renamed_Object (gnat_entity))) | |
834 | { | |
835 | bool create_normal_object = false; | |
836 | ||
837 | /* If the renamed object had padding, strip off the reference | |
838 | to the inner object and reset our type. */ | |
839 | if ((TREE_CODE (gnu_expr) == COMPONENT_REF | |
840 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_expr, 0))) | |
841 | == RECORD_TYPE | |
842 | && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))) | |
843 | /* Strip useless conversions around the object. */ | |
d626a092 | 844 | || (TREE_CODE (gnu_expr) == NOP_EXPR |
845 | && gnat_types_compatible_p | |
846 | (TREE_TYPE (gnu_expr), | |
847 | TREE_TYPE (TREE_OPERAND (gnu_expr, 0))))) | |
27becfc8 | 848 | { |
849 | gnu_expr = TREE_OPERAND (gnu_expr, 0); | |
850 | gnu_type = TREE_TYPE (gnu_expr); | |
851 | } | |
852 | ||
853 | /* Case 1: If this is a constant renaming stemming from a function | |
854 | call, treat it as a normal object whose initial value is what | |
855 | is being renamed. RM 3.3 says that the result of evaluating a | |
856 | function call is a constant object. As a consequence, it can | |
857 | be the inner object of a constant renaming. In this case, the | |
858 | renaming must be fully instantiated, i.e. it cannot be a mere | |
859 | reference to (part of) an existing object. */ | |
860 | if (const_flag) | |
861 | { | |
862 | tree inner_object = gnu_expr; | |
863 | while (handled_component_p (inner_object)) | |
864 | inner_object = TREE_OPERAND (inner_object, 0); | |
865 | if (TREE_CODE (inner_object) == CALL_EXPR) | |
866 | create_normal_object = true; | |
867 | } | |
868 | ||
869 | /* Otherwise, see if we can proceed with a stabilized version of | |
870 | the renamed entity or if we need to make a new object. */ | |
871 | if (!create_normal_object) | |
872 | { | |
873 | tree maybe_stable_expr = NULL_TREE; | |
874 | bool stable = false; | |
875 | ||
876 | /* Case 2: If the renaming entity need not be materialized and | |
877 | the renamed expression is something we can stabilize, use | |
878 | that for the renaming. At the global level, we can only do | |
879 | this if we know no SAVE_EXPRs need be made, because the | |
880 | expression we return might be used in arbitrary conditional | |
881 | branches so we must force the SAVE_EXPRs evaluation | |
882 | immediately and this requires a function context. */ | |
883 | if (!Materialize_Entity (gnat_entity) | |
884 | && (!global_bindings_p () | |
885 | || (staticp (gnu_expr) | |
886 | && !TREE_SIDE_EFFECTS (gnu_expr)))) | |
887 | { | |
888 | maybe_stable_expr | |
889 | = maybe_stabilize_reference (gnu_expr, true, &stable); | |
890 | ||
891 | if (stable) | |
892 | { | |
893 | gnu_decl = maybe_stable_expr; | |
894 | /* ??? No DECL_EXPR is created so we need to mark | |
895 | the expression manually lest it is shared. */ | |
896 | if (global_bindings_p ()) | |
897 | mark_visited (&gnu_decl); | |
898 | save_gnu_tree (gnat_entity, gnu_decl, true); | |
899 | saved = true; | |
900 | break; | |
901 | } | |
902 | ||
903 | /* The stabilization failed. Keep maybe_stable_expr | |
904 | untouched here to let the pointer case below know | |
905 | about that failure. */ | |
906 | } | |
907 | ||
908 | /* Case 3: If this is a constant renaming and creating a | |
909 | new object is allowed and cheap, treat it as a normal | |
910 | object whose initial value is what is being renamed. */ | |
e3676880 | 911 | if (const_flag |
912 | && !Is_Composite_Type | |
913 | (Underlying_Type (Etype (gnat_entity)))) | |
27becfc8 | 914 | ; |
915 | ||
916 | /* Case 4: Make this into a constant pointer to the object we | |
917 | are to rename and attach the object to the pointer if it is | |
918 | something we can stabilize. | |
919 | ||
920 | From the proper scope, attached objects will be referenced | |
921 | directly instead of indirectly via the pointer to avoid | |
922 | subtle aliasing problems with non-addressable entities. | |
923 | They have to be stable because we must not evaluate the | |
924 | variables in the expression every time the renaming is used. | |
925 | The pointer is called a "renaming" pointer in this case. | |
926 | ||
927 | In the rare cases where we cannot stabilize the renamed | |
928 | object, we just make a "bare" pointer, and the renamed | |
929 | entity is always accessed indirectly through it. */ | |
930 | else | |
931 | { | |
932 | gnu_type = build_reference_type (gnu_type); | |
933 | inner_const_flag = TREE_READONLY (gnu_expr); | |
934 | const_flag = true; | |
935 | ||
936 | /* If the previous attempt at stabilizing failed, there | |
937 | is no point in trying again and we reuse the result | |
938 | without attaching it to the pointer. In this case it | |
939 | will only be used as the initializing expression of | |
940 | the pointer and thus needs no special treatment with | |
941 | regard to multiple evaluations. */ | |
942 | if (maybe_stable_expr) | |
943 | ; | |
944 | ||
945 | /* Otherwise, try to stabilize and attach the expression | |
946 | to the pointer if the stabilization succeeds. | |
947 | ||
948 | Note that this might introduce SAVE_EXPRs and we don't | |
949 | check whether we're at the global level or not. This | |
950 | is fine since we are building a pointer initializer and | |
951 | neither the pointer nor the initializing expression can | |
952 | be accessed before the pointer elaboration has taken | |
953 | place in a correct program. | |
954 | ||
955 | These SAVE_EXPRs will be evaluated at the right place | |
956 | by either the evaluation of the initializer for the | |
957 | non-global case or the elaboration code for the global | |
958 | case, and will be attached to the elaboration procedure | |
959 | in the latter case. */ | |
960 | else | |
961 | { | |
962 | maybe_stable_expr | |
963 | = maybe_stabilize_reference (gnu_expr, true, &stable); | |
964 | ||
965 | if (stable) | |
966 | renamed_obj = maybe_stable_expr; | |
967 | ||
968 | /* Attaching is actually performed downstream, as soon | |
969 | as we have a VAR_DECL for the pointer we make. */ | |
970 | } | |
971 | ||
972 | gnu_expr | |
973 | = build_unary_op (ADDR_EXPR, gnu_type, maybe_stable_expr); | |
974 | ||
975 | gnu_size = NULL_TREE; | |
976 | used_by_ref = true; | |
977 | } | |
978 | } | |
979 | } | |
980 | ||
71ef616f | 981 | /* Make a volatile version of this object's type if we are to make |
982 | the object volatile. We also interpret 13.3(19) conservatively | |
aac684f2 | 983 | and disallow any optimizations for such a non-constant object. */ |
71ef616f | 984 | if ((Treat_As_Volatile (gnat_entity) |
aac684f2 | 985 | || (!const_flag |
986 | && (Is_Exported (gnat_entity) | |
987 | || Is_Imported (gnat_entity) | |
988 | || Present (Address_Clause (gnat_entity))))) | |
71ef616f | 989 | && !TYPE_VOLATILE (gnu_type)) |
990 | gnu_type = build_qualified_type (gnu_type, | |
991 | (TYPE_QUALS (gnu_type) | |
992 | | TYPE_QUAL_VOLATILE)); | |
993 | ||
994 | /* If we are defining an aliased object whose nominal subtype is | |
995 | unconstrained, the object is a record that contains both the | |
996 | template and the object. If there is an initializer, it will | |
997 | have already been converted to the right type, but we need to | |
998 | create the template if there is no initializer. */ | |
999 | if (definition | |
1000 | && !gnu_expr | |
1001 | && TREE_CODE (gnu_type) == RECORD_TYPE | |
1002 | && (TYPE_CONTAINS_TEMPLATE_P (gnu_type) | |
1003 | /* Beware that padding might have been introduced | |
1004 | via maybe_pad_type above. */ | |
1005 | || (TYPE_IS_PADDING_P (gnu_type) | |
1006 | && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type))) | |
1007 | == RECORD_TYPE | |
1008 | && TYPE_CONTAINS_TEMPLATE_P | |
1009 | (TREE_TYPE (TYPE_FIELDS (gnu_type)))))) | |
27becfc8 | 1010 | { |
1011 | tree template_field | |
1012 | = TYPE_IS_PADDING_P (gnu_type) | |
1013 | ? TYPE_FIELDS (TREE_TYPE (TYPE_FIELDS (gnu_type))) | |
1014 | : TYPE_FIELDS (gnu_type); | |
1015 | ||
1016 | gnu_expr | |
1017 | = gnat_build_constructor | |
1018 | (gnu_type, | |
1019 | tree_cons | |
1020 | (template_field, | |
1021 | build_template (TREE_TYPE (template_field), | |
1022 | TREE_TYPE (TREE_CHAIN (template_field)), | |
1023 | NULL_TREE), | |
1024 | NULL_TREE)); | |
1025 | } | |
1026 | ||
1027 | /* Convert the expression to the type of the object except in the | |
1028 | case where the object's type is unconstrained or the object's type | |
1029 | is a padded record whose field is of self-referential size. In | |
1030 | the former case, converting will generate unnecessary evaluations | |
1031 | of the CONSTRUCTOR to compute the size and in the latter case, we | |
1032 | want to only copy the actual data. */ | |
1033 | if (gnu_expr | |
1034 | && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE | |
1035 | && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)) | |
1036 | && !(TREE_CODE (gnu_type) == RECORD_TYPE | |
1037 | && TYPE_IS_PADDING_P (gnu_type) | |
1038 | && (CONTAINS_PLACEHOLDER_P | |
1039 | (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type))))))) | |
1040 | gnu_expr = convert (gnu_type, gnu_expr); | |
1041 | ||
1042 | /* If this is a pointer and it does not have an initializing | |
1043 | expression, initialize it to NULL, unless the object is | |
1044 | imported. */ | |
1045 | if (definition | |
1046 | && (POINTER_TYPE_P (gnu_type) || TYPE_FAT_POINTER_P (gnu_type)) | |
1047 | && !Is_Imported (gnat_entity) && !gnu_expr) | |
1048 | gnu_expr = integer_zero_node; | |
1049 | ||
d47e2843 | 1050 | /* If we are defining the object and it has an Address clause, we must |
1051 | either get the address expression from the saved GCC tree for the | |
1052 | object if it has a Freeze node, or elaborate the address expression | |
1053 | here since the front-end has guaranteed that the elaboration has no | |
1054 | effects in this case. */ | |
27becfc8 | 1055 | if (definition && Present (Address_Clause (gnat_entity))) |
1056 | { | |
1057 | tree gnu_address | |
d47e2843 | 1058 | = present_gnu_tree (gnat_entity) |
1059 | ? get_gnu_tree (gnat_entity) | |
1060 | : gnat_to_gnu (Expression (Address_Clause (gnat_entity))); | |
27becfc8 | 1061 | |
1062 | save_gnu_tree (gnat_entity, NULL_TREE, false); | |
1063 | ||
1064 | /* Ignore the size. It's either meaningless or was handled | |
1065 | above. */ | |
1066 | gnu_size = NULL_TREE; | |
1067 | /* Convert the type of the object to a reference type that can | |
1068 | alias everything as per 13.3(19). */ | |
1069 | gnu_type | |
1070 | = build_reference_type_for_mode (gnu_type, ptr_mode, true); | |
1071 | gnu_address = convert (gnu_type, gnu_address); | |
1072 | used_by_ref = true; | |
1073 | const_flag = !Is_Public (gnat_entity) | |
1074 | || compile_time_known_address_p (Expression (Address_Clause | |
1075 | (gnat_entity))); | |
1076 | ||
d47e2843 | 1077 | /* If this is a deferred constant, the initializer is attached to |
1078 | the full view. */ | |
1079 | if (kind == E_Constant && Present (Full_View (gnat_entity))) | |
1080 | gnu_expr | |
1081 | = gnat_to_gnu | |
1082 | (Expression (Declaration_Node (Full_View (gnat_entity)))); | |
1083 | ||
27becfc8 | 1084 | /* If we don't have an initializing expression for the underlying |
1085 | variable, the initializing expression for the pointer is the | |
1086 | specified address. Otherwise, we have to make a COMPOUND_EXPR | |
1087 | to assign both the address and the initial value. */ | |
1088 | if (!gnu_expr) | |
1089 | gnu_expr = gnu_address; | |
1090 | else | |
1091 | gnu_expr | |
1092 | = build2 (COMPOUND_EXPR, gnu_type, | |
1093 | build_binary_op | |
1094 | (MODIFY_EXPR, NULL_TREE, | |
1095 | build_unary_op (INDIRECT_REF, NULL_TREE, | |
1096 | gnu_address), | |
1097 | gnu_expr), | |
1098 | gnu_address); | |
1099 | } | |
1100 | ||
1101 | /* If it has an address clause and we are not defining it, mark it | |
1102 | as an indirect object. Likewise for Stdcall objects that are | |
1103 | imported. */ | |
1104 | if ((!definition && Present (Address_Clause (gnat_entity))) | |
1105 | || (Is_Imported (gnat_entity) | |
1106 | && Has_Stdcall_Convention (gnat_entity))) | |
1107 | { | |
1108 | /* Convert the type of the object to a reference type that can | |
1109 | alias everything as per 13.3(19). */ | |
1110 | gnu_type | |
1111 | = build_reference_type_for_mode (gnu_type, ptr_mode, true); | |
1112 | gnu_size = NULL_TREE; | |
1113 | ||
1114 | /* No point in taking the address of an initializing expression | |
1115 | that isn't going to be used. */ | |
1116 | gnu_expr = NULL_TREE; | |
1117 | ||
1118 | /* If it has an address clause whose value is known at compile | |
1119 | time, make the object a CONST_DECL. This will avoid a | |
1120 | useless dereference. */ | |
1121 | if (Present (Address_Clause (gnat_entity))) | |
1122 | { | |
1123 | Node_Id gnat_address | |
1124 | = Expression (Address_Clause (gnat_entity)); | |
1125 | ||
1126 | if (compile_time_known_address_p (gnat_address)) | |
1127 | { | |
1128 | gnu_expr = gnat_to_gnu (gnat_address); | |
1129 | const_flag = true; | |
1130 | } | |
1131 | } | |
1132 | ||
1133 | used_by_ref = true; | |
1134 | } | |
1135 | ||
1136 | /* If we are at top level and this object is of variable size, | |
1137 | make the actual type a hidden pointer to the real type and | |
1138 | make the initializer be a memory allocation and initialization. | |
1139 | Likewise for objects we aren't defining (presumed to be | |
1140 | external references from other packages), but there we do | |
1141 | not set up an initialization. | |
1142 | ||
1143 | If the object's size overflows, make an allocator too, so that | |
1144 | Storage_Error gets raised. Note that we will never free | |
1145 | such memory, so we presume it never will get allocated. */ | |
1146 | ||
1147 | if (!allocatable_size_p (TYPE_SIZE_UNIT (gnu_type), | |
1148 | global_bindings_p () || !definition | |
1149 | || static_p) | |
1150 | || (gnu_size | |
1151 | && ! allocatable_size_p (gnu_size, | |
1152 | global_bindings_p () || !definition | |
1153 | || static_p))) | |
1154 | { | |
1155 | gnu_type = build_reference_type (gnu_type); | |
1156 | gnu_size = NULL_TREE; | |
1157 | used_by_ref = true; | |
1158 | const_flag = true; | |
1159 | ||
1160 | /* In case this was a aliased object whose nominal subtype is | |
1161 | unconstrained, the pointer above will be a thin pointer and | |
1162 | build_allocator will automatically make the template. | |
1163 | ||
1164 | If we have a template initializer only (that we made above), | |
1165 | pretend there is none and rely on what build_allocator creates | |
1166 | again anyway. Otherwise (if we have a full initializer), get | |
1167 | the data part and feed that to build_allocator. | |
1168 | ||
1169 | If we are elaborating a mutable object, tell build_allocator to | |
1170 | ignore a possibly simpler size from the initializer, if any, as | |
1171 | we must allocate the maximum possible size in this case. */ | |
1172 | ||
1173 | if (definition) | |
1174 | { | |
1175 | tree gnu_alloc_type = TREE_TYPE (gnu_type); | |
1176 | ||
1177 | if (TREE_CODE (gnu_alloc_type) == RECORD_TYPE | |
1178 | && TYPE_CONTAINS_TEMPLATE_P (gnu_alloc_type)) | |
1179 | { | |
1180 | gnu_alloc_type | |
1181 | = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_alloc_type))); | |
1182 | ||
1183 | if (TREE_CODE (gnu_expr) == CONSTRUCTOR | |
1184 | && 1 == VEC_length (constructor_elt, | |
1185 | CONSTRUCTOR_ELTS (gnu_expr))) | |
1186 | gnu_expr = 0; | |
1187 | else | |
1188 | gnu_expr | |
1189 | = build_component_ref | |
1190 | (gnu_expr, NULL_TREE, | |
1191 | TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (gnu_expr))), | |
1192 | false); | |
1193 | } | |
1194 | ||
1195 | if (TREE_CODE (TYPE_SIZE_UNIT (gnu_alloc_type)) == INTEGER_CST | |
1196 | && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_alloc_type)) | |
1197 | && !Is_Imported (gnat_entity)) | |
1198 | post_error ("?Storage_Error will be raised at run-time!", | |
1199 | gnat_entity); | |
1200 | ||
86f19fde | 1201 | gnu_expr |
1202 | = build_allocator (gnu_alloc_type, gnu_expr, gnu_type, | |
1203 | Empty, Empty, gnat_entity, mutable_p); | |
27becfc8 | 1204 | } |
1205 | else | |
1206 | { | |
1207 | gnu_expr = NULL_TREE; | |
1208 | const_flag = false; | |
1209 | } | |
1210 | } | |
1211 | ||
1212 | /* If this object would go into the stack and has an alignment larger | |
1213 | than the largest stack alignment the back-end can honor, resort to | |
1214 | a variable of "aligning type". */ | |
1215 | if (!global_bindings_p () && !static_p && definition | |
1216 | && !imported_p && TYPE_ALIGN (gnu_type) > BIGGEST_ALIGNMENT) | |
1217 | { | |
1218 | /* Create the new variable. No need for extra room before the | |
1219 | aligned field as this is in automatic storage. */ | |
1220 | tree gnu_new_type | |
1221 | = make_aligning_type (gnu_type, TYPE_ALIGN (gnu_type), | |
1222 | TYPE_SIZE_UNIT (gnu_type), | |
1223 | BIGGEST_ALIGNMENT, 0); | |
1224 | tree gnu_new_var | |
1225 | = create_var_decl (create_concat_name (gnat_entity, "ALIGN"), | |
1226 | NULL_TREE, gnu_new_type, NULL_TREE, false, | |
1227 | false, false, false, NULL, gnat_entity); | |
1228 | ||
1229 | /* Initialize the aligned field if we have an initializer. */ | |
1230 | if (gnu_expr) | |
1231 | add_stmt_with_node | |
1232 | (build_binary_op (MODIFY_EXPR, NULL_TREE, | |
1233 | build_component_ref | |
1234 | (gnu_new_var, NULL_TREE, | |
1235 | TYPE_FIELDS (gnu_new_type), false), | |
1236 | gnu_expr), | |
1237 | gnat_entity); | |
1238 | ||
1239 | /* And setup this entity as a reference to the aligned field. */ | |
1240 | gnu_type = build_reference_type (gnu_type); | |
1241 | gnu_expr | |
1242 | = build_unary_op | |
1243 | (ADDR_EXPR, gnu_type, | |
1244 | build_component_ref (gnu_new_var, NULL_TREE, | |
1245 | TYPE_FIELDS (gnu_new_type), false)); | |
1246 | ||
1247 | gnu_size = NULL_TREE; | |
1248 | used_by_ref = true; | |
1249 | const_flag = true; | |
1250 | } | |
1251 | ||
1252 | if (const_flag) | |
1253 | gnu_type = build_qualified_type (gnu_type, (TYPE_QUALS (gnu_type) | |
1254 | | TYPE_QUAL_CONST)); | |
1255 | ||
1256 | /* Convert the expression to the type of the object except in the | |
1257 | case where the object's type is unconstrained or the object's type | |
1258 | is a padded record whose field is of self-referential size. In | |
1259 | the former case, converting will generate unnecessary evaluations | |
1260 | of the CONSTRUCTOR to compute the size and in the latter case, we | |
1261 | want to only copy the actual data. */ | |
1262 | if (gnu_expr | |
1263 | && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE | |
1264 | && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)) | |
1265 | && !(TREE_CODE (gnu_type) == RECORD_TYPE | |
1266 | && TYPE_IS_PADDING_P (gnu_type) | |
1267 | && (CONTAINS_PLACEHOLDER_P | |
1268 | (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type))))))) | |
1269 | gnu_expr = convert (gnu_type, gnu_expr); | |
1270 | ||
1271 | /* If this name is external or there was a name specified, use it, | |
1272 | unless this is a VMS exception object since this would conflict | |
1273 | with the symbol we need to export in addition. Don't use the | |
1274 | Interface_Name if there is an address clause (see CD30005). */ | |
1275 | if (!Is_VMS_Exception (gnat_entity) | |
1276 | && ((Present (Interface_Name (gnat_entity)) | |
1277 | && No (Address_Clause (gnat_entity))) | |
1278 | || (Is_Public (gnat_entity) | |
1279 | && (!Is_Imported (gnat_entity) | |
1280 | || Is_Exported (gnat_entity))))) | |
e3698827 | 1281 | gnu_ext_name = create_concat_name (gnat_entity, NULL); |
27becfc8 | 1282 | |
1283 | /* If this is constant initialized to a static constant and the | |
1284 | object has an aggregate type, force it to be statically | |
1f141a0c | 1285 | allocated. This will avoid an initialization copy. */ |
1286 | if (!static_p && const_flag | |
1287 | && gnu_expr && TREE_CONSTANT (gnu_expr) | |
1288 | && AGGREGATE_TYPE_P (gnu_type) | |
27becfc8 | 1289 | && host_integerp (TYPE_SIZE_UNIT (gnu_type), 1) |
1f141a0c | 1290 | && !(TREE_CODE (gnu_type) == RECORD_TYPE |
1291 | && TYPE_IS_PADDING_P (gnu_type) | |
1292 | && !host_integerp (TYPE_SIZE_UNIT | |
1293 | (TREE_TYPE (TYPE_FIELDS (gnu_type))), 1))) | |
27becfc8 | 1294 | static_p = true; |
1295 | ||
e3698827 | 1296 | gnu_decl = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type, |
27becfc8 | 1297 | gnu_expr, const_flag, |
1298 | Is_Public (gnat_entity), | |
1299 | imported_p || !definition, | |
1300 | static_p, attr_list, gnat_entity); | |
1301 | DECL_BY_REF_P (gnu_decl) = used_by_ref; | |
1302 | DECL_POINTS_TO_READONLY_P (gnu_decl) = used_by_ref && inner_const_flag; | |
1303 | if (TREE_CODE (gnu_decl) == VAR_DECL && renamed_obj) | |
1304 | { | |
1305 | SET_DECL_RENAMED_OBJECT (gnu_decl, renamed_obj); | |
1306 | if (global_bindings_p ()) | |
1307 | { | |
1308 | DECL_RENAMING_GLOBAL_P (gnu_decl) = 1; | |
1309 | record_global_renaming_pointer (gnu_decl); | |
1310 | } | |
1311 | } | |
1312 | ||
4852b829 | 1313 | if (definition && DECL_SIZE_UNIT (gnu_decl) |
27becfc8 | 1314 | && get_block_jmpbuf_decl () |
4852b829 | 1315 | && (TREE_CODE (DECL_SIZE_UNIT (gnu_decl)) != INTEGER_CST |
1316 | || (flag_stack_check == GENERIC_STACK_CHECK | |
1317 | && compare_tree_int (DECL_SIZE_UNIT (gnu_decl), | |
1318 | STACK_CHECK_MAX_VAR_SIZE) > 0))) | |
27becfc8 | 1319 | add_stmt_with_node (build_call_1_expr |
1320 | (update_setjmp_buf_decl, | |
1321 | build_unary_op (ADDR_EXPR, NULL_TREE, | |
1322 | get_block_jmpbuf_decl ())), | |
1323 | gnat_entity); | |
1324 | ||
d6917824 | 1325 | /* If we are defining an Out parameter and we're not optimizing, |
1326 | create a fake PARM_DECL for debugging purposes and make it | |
1327 | point to the VAR_DECL. Suppress debug info for the latter | |
1328 | but make sure it will still live on the stack so it can be | |
1329 | accessed from within the debugger through the PARM_DECL. */ | |
1330 | if (kind == E_Out_Parameter && definition && !optimize) | |
1331 | { | |
e3698827 | 1332 | tree param = create_param_decl (gnu_entity_name, gnu_type, false); |
d6917824 | 1333 | gnat_pushdecl (param, gnat_entity); |
1334 | SET_DECL_VALUE_EXPR (param, gnu_decl); | |
1335 | DECL_HAS_VALUE_EXPR_P (param) = 1; | |
1336 | if (debug_info_p) | |
1337 | debug_info_p = false; | |
1338 | else | |
1339 | DECL_IGNORED_P (param) = 1; | |
1340 | TREE_ADDRESSABLE (gnu_decl) = 1; | |
1341 | } | |
1342 | ||
27becfc8 | 1343 | /* If this is a public constant or we're not optimizing and we're not |
1344 | making a VAR_DECL for it, make one just for export or debugger use. | |
1345 | Likewise if the address is taken or if either the object or type is | |
1346 | aliased. Make an external declaration for a reference, unless this | |
1347 | is a Standard entity since there no real symbol at the object level | |
1348 | for these. */ | |
1349 | if (TREE_CODE (gnu_decl) == CONST_DECL | |
1350 | && (definition || Sloc (gnat_entity) > Standard_Location) | |
a002cb99 | 1351 | && ((Is_Public (gnat_entity) && No (Address_Clause (gnat_entity))) |
a462cd80 | 1352 | || !optimize |
27becfc8 | 1353 | || Address_Taken (gnat_entity) |
1354 | || Is_Aliased (gnat_entity) | |
1355 | || Is_Aliased (Etype (gnat_entity)))) | |
1356 | { | |
1357 | tree gnu_corr_var | |
e3698827 | 1358 | = create_true_var_decl (gnu_entity_name, gnu_ext_name, gnu_type, |
27becfc8 | 1359 | gnu_expr, true, Is_Public (gnat_entity), |
1360 | !definition, static_p, NULL, | |
1361 | gnat_entity); | |
1362 | ||
1363 | SET_DECL_CONST_CORRESPONDING_VAR (gnu_decl, gnu_corr_var); | |
1364 | ||
1365 | /* As debugging information will be generated for the variable, | |
1366 | do not generate information for the constant. */ | |
a462cd80 | 1367 | DECL_IGNORED_P (gnu_decl) = 1; |
27becfc8 | 1368 | } |
1369 | ||
1370 | /* If this is declared in a block that contains a block with an | |
1371 | exception handler, we must force this variable in memory to | |
1372 | suppress an invalid optimization. */ | |
1373 | if (Has_Nested_Block_With_Handler (Scope (gnat_entity)) | |
1374 | && Exception_Mechanism != Back_End_Exceptions) | |
1375 | TREE_ADDRESSABLE (gnu_decl) = 1; | |
1376 | ||
1377 | gnu_type = TREE_TYPE (gnu_decl); | |
1378 | ||
1379 | /* Back-annotate Alignment and Esize of the object if not already | |
1380 | known, except for when the object is actually a pointer to the | |
1381 | real object, since alignment and size of a pointer don't have | |
1382 | anything to do with those of the designated object. Note that | |
1383 | we pick the values of the type, not those of the object, to | |
1384 | shield ourselves from low-level platform-dependent adjustments | |
1385 | like alignment promotion. This is both consistent with all the | |
1386 | treatment above, where alignment and size are set on the type of | |
1387 | the object and not on the object directly, and makes it possible | |
1388 | to support confirming representation clauses in all cases. */ | |
1389 | ||
1390 | if (!used_by_ref && Unknown_Alignment (gnat_entity)) | |
1391 | Set_Alignment (gnat_entity, | |
1392 | UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT)); | |
1393 | ||
1394 | if (!used_by_ref && Unknown_Esize (gnat_entity)) | |
1395 | { | |
1396 | if (TREE_CODE (gnu_type) == RECORD_TYPE | |
1397 | && TYPE_CONTAINS_TEMPLATE_P (gnu_type)) | |
1398 | gnu_object_size | |
1399 | = TYPE_SIZE (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)))); | |
1400 | ||
1401 | Set_Esize (gnat_entity, annotate_value (gnu_object_size)); | |
1402 | } | |
1403 | } | |
1404 | break; | |
1405 | ||
1406 | case E_Void: | |
1407 | /* Return a TYPE_DECL for "void" that we previously made. */ | |
515c6c6c | 1408 | gnu_decl = TYPE_NAME (void_type_node); |
27becfc8 | 1409 | break; |
1410 | ||
1411 | case E_Enumeration_Type: | |
a002cb99 | 1412 | /* A special case: for the types Character and Wide_Character in |
ea5ec53d | 1413 | Standard, we do not list all the literals. So if the literals |
27becfc8 | 1414 | are not specified, make this an unsigned type. */ |
1415 | if (No (First_Literal (gnat_entity))) | |
1416 | { | |
1417 | gnu_type = make_unsigned_type (esize); | |
e3698827 | 1418 | TYPE_NAME (gnu_type) = gnu_entity_name; |
27becfc8 | 1419 | |
a002cb99 | 1420 | /* Set TYPE_STRING_FLAG for Character and Wide_Character types. |
ea5ec53d | 1421 | This is needed by the DWARF-2 back-end to distinguish between |
1422 | unsigned integer types and character types. */ | |
27becfc8 | 1423 | TYPE_STRING_FLAG (gnu_type) = 1; |
1424 | break; | |
1425 | } | |
1426 | ||
a002cb99 | 1427 | /* Normal case of non-character type or non-Standard character type. */ |
27becfc8 | 1428 | { |
1429 | /* Here we have a list of enumeral constants in First_Literal. | |
1430 | We make a CONST_DECL for each and build into GNU_LITERAL_LIST | |
a002cb99 | 1431 | the list to be placed into TYPE_FIELDS. Each node in the list |
1432 | is a TREE_LIST whose TREE_VALUE is the literal name and whose | |
1433 | TREE_PURPOSE is the value of the literal. */ | |
27becfc8 | 1434 | |
1435 | Entity_Id gnat_literal; | |
1436 | tree gnu_literal_list = NULL_TREE; | |
1437 | ||
1438 | if (Is_Unsigned_Type (gnat_entity)) | |
1439 | gnu_type = make_unsigned_type (esize); | |
1440 | else | |
1441 | gnu_type = make_signed_type (esize); | |
1442 | ||
1443 | TREE_SET_CODE (gnu_type, ENUMERAL_TYPE); | |
1444 | ||
1445 | for (gnat_literal = First_Literal (gnat_entity); | |
1446 | Present (gnat_literal); | |
1447 | gnat_literal = Next_Literal (gnat_literal)) | |
1448 | { | |
1449 | tree gnu_value = UI_To_gnu (Enumeration_Rep (gnat_literal), | |
1450 | gnu_type); | |
1451 | tree gnu_literal | |
1452 | = create_var_decl (get_entity_name (gnat_literal), NULL_TREE, | |
1453 | gnu_type, gnu_value, true, false, false, | |
1454 | false, NULL, gnat_literal); | |
1455 | ||
1456 | save_gnu_tree (gnat_literal, gnu_literal, false); | |
1457 | gnu_literal_list = tree_cons (DECL_NAME (gnu_literal), | |
1458 | gnu_value, gnu_literal_list); | |
1459 | } | |
1460 | ||
1461 | TYPE_VALUES (gnu_type) = nreverse (gnu_literal_list); | |
1462 | ||
1463 | /* Note that the bounds are updated at the end of this function | |
a002cb99 | 1464 | to avoid an infinite recursion since they refer to the type. */ |
27becfc8 | 1465 | } |
1466 | break; | |
1467 | ||
1468 | case E_Signed_Integer_Type: | |
1469 | case E_Ordinary_Fixed_Point_Type: | |
1470 | case E_Decimal_Fixed_Point_Type: | |
1471 | /* For integer types, just make a signed type the appropriate number | |
1472 | of bits. */ | |
1473 | gnu_type = make_signed_type (esize); | |
1474 | break; | |
1475 | ||
1476 | case E_Modular_Integer_Type: | |
27becfc8 | 1477 | { |
153edb51 | 1478 | /* For modular types, make the unsigned type of the proper number |
1479 | of bits and then set up the modulus, if required. */ | |
1480 | tree gnu_modulus, gnu_high = NULL_TREE; | |
27becfc8 | 1481 | |
153edb51 | 1482 | /* Packed array types are supposed to be subtypes only. */ |
1483 | gcc_assert (!Is_Packed_Array_Type (gnat_entity)); | |
27becfc8 | 1484 | |
a002cb99 | 1485 | gnu_type = make_unsigned_type (esize); |
27becfc8 | 1486 | |
1487 | /* Get the modulus in this type. If it overflows, assume it is because | |
1488 | it is equal to 2**Esize. Note that there is no overflow checking | |
1489 | done on unsigned type, so we detect the overflow by looking for | |
1490 | a modulus of zero, which is otherwise invalid. */ | |
1491 | gnu_modulus = UI_To_gnu (Modulus (gnat_entity), gnu_type); | |
1492 | ||
1493 | if (!integer_zerop (gnu_modulus)) | |
1494 | { | |
1495 | TYPE_MODULAR_P (gnu_type) = 1; | |
1496 | SET_TYPE_MODULUS (gnu_type, gnu_modulus); | |
1497 | gnu_high = fold_build2 (MINUS_EXPR, gnu_type, gnu_modulus, | |
1498 | convert (gnu_type, integer_one_node)); | |
1499 | } | |
1500 | ||
a002cb99 | 1501 | /* If the upper bound is not maximal, make an extra subtype. */ |
1502 | if (gnu_high | |
1503 | && !tree_int_cst_equal (gnu_high, TYPE_MAX_VALUE (gnu_type))) | |
27becfc8 | 1504 | { |
a002cb99 | 1505 | tree gnu_subtype = make_unsigned_type (esize); |
a9538d68 | 1506 | SET_TYPE_RM_MAX_VALUE (gnu_subtype, gnu_high); |
27becfc8 | 1507 | TREE_TYPE (gnu_subtype) = gnu_type; |
27becfc8 | 1508 | TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1; |
a002cb99 | 1509 | TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "UMT"); |
27becfc8 | 1510 | gnu_type = gnu_subtype; |
1511 | } | |
1512 | } | |
1513 | break; | |
1514 | ||
1515 | case E_Signed_Integer_Subtype: | |
1516 | case E_Enumeration_Subtype: | |
1517 | case E_Modular_Integer_Subtype: | |
1518 | case E_Ordinary_Fixed_Point_Subtype: | |
1519 | case E_Decimal_Fixed_Point_Subtype: | |
1520 | ||
0fbac54a | 1521 | /* For integral subtypes, we make a new INTEGER_TYPE. Note that we do |
a9538d68 | 1522 | not want to call create_range_type since we would like each subtype |
0fbac54a | 1523 | node to be distinct. ??? Historically this was in preparation for |
211df513 | 1524 | when memory aliasing is implemented, but that's obsolete now given |
0fbac54a | 1525 | the call to relate_alias_sets below. |
27becfc8 | 1526 | |
a002cb99 | 1527 | The TREE_TYPE field of the INTEGER_TYPE points to the base type; |
1528 | this fact is used by the arithmetic conversion functions. | |
27becfc8 | 1529 | |
a002cb99 | 1530 | We elaborate the Ancestor_Subtype if it is not in the current unit |
1531 | and one of our bounds is non-static. We do this to ensure consistent | |
1532 | naming in the case where several subtypes share the same bounds, by | |
1533 | elaborating the first such subtype first, thus using its name. */ | |
27becfc8 | 1534 | |
1535 | if (!definition | |
1536 | && Present (Ancestor_Subtype (gnat_entity)) | |
1537 | && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity)) | |
1538 | && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity)) | |
1539 | || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity)))) | |
153edb51 | 1540 | gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity), gnu_expr, 0); |
27becfc8 | 1541 | |
a9538d68 | 1542 | /* Set the precision to the Esize except for bit-packed arrays. */ |
27becfc8 | 1543 | if (Is_Packed_Array_Type (gnat_entity) |
1544 | && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))) | |
62f026a2 | 1545 | esize = UI_To_Int (RM_Size (gnat_entity)); |
27becfc8 | 1546 | |
a9538d68 | 1547 | /* This should be an unsigned type if the base type is unsigned or |
1548 | if the lower bound is constant and non-negative or if the type | |
1549 | is biased. */ | |
1550 | if (Is_Unsigned_Type (Etype (gnat_entity)) | |
1551 | || Is_Unsigned_Type (gnat_entity) | |
1552 | || Has_Biased_Representation (gnat_entity)) | |
1553 | gnu_type = make_unsigned_type (esize); | |
1554 | else | |
1555 | gnu_type = make_signed_type (esize); | |
1556 | TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity)); | |
27becfc8 | 1557 | |
a9538d68 | 1558 | SET_TYPE_RM_MIN_VALUE |
1559 | (gnu_type, | |
1560 | convert (TREE_TYPE (gnu_type), | |
1561 | elaborate_expression (Type_Low_Bound (gnat_entity), | |
1562 | gnat_entity, get_identifier ("L"), | |
1563 | definition, true, | |
1564 | Needs_Debug_Info (gnat_entity)))); | |
1565 | ||
1566 | SET_TYPE_RM_MAX_VALUE | |
1567 | (gnu_type, | |
1568 | convert (TREE_TYPE (gnu_type), | |
1569 | elaborate_expression (Type_High_Bound (gnat_entity), | |
1570 | gnat_entity, get_identifier ("U"), | |
1571 | definition, true, | |
1572 | Needs_Debug_Info (gnat_entity)))); | |
27becfc8 | 1573 | |
1574 | /* One of the above calls might have caused us to be elaborated, | |
1575 | so don't blow up if so. */ | |
1576 | if (present_gnu_tree (gnat_entity)) | |
1577 | { | |
1578 | maybe_present = true; | |
1579 | break; | |
1580 | } | |
1581 | ||
1582 | TYPE_BIASED_REPRESENTATION_P (gnu_type) | |
1583 | = Has_Biased_Representation (gnat_entity); | |
1584 | ||
690b2030 | 1585 | /* Attach the TYPE_STUB_DECL in case we have a parallel type. */ |
1586 | TYPE_STUB_DECL (gnu_type) | |
1587 | = create_type_stub_decl (gnu_entity_name, gnu_type); | |
1588 | ||
27becfc8 | 1589 | /* Inherit our alias set from what we're a subtype of. Subtypes |
1590 | are not different types and a pointer can designate any instance | |
1591 | within a subtype hierarchy. */ | |
892fdb03 | 1592 | relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY); |
27becfc8 | 1593 | |
690b2030 | 1594 | /* For a packed array, make the original array type a parallel type. */ |
1595 | if (debug_info_p | |
1596 | && Is_Packed_Array_Type (gnat_entity) | |
1597 | && present_gnu_tree (Original_Array_Type (gnat_entity))) | |
1598 | add_parallel_type (TYPE_STUB_DECL (gnu_type), | |
1599 | gnat_to_gnu_type | |
1600 | (Original_Array_Type (gnat_entity))); | |
1601 | ||
62f026a2 | 1602 | /* If the type we are dealing with represents a bit-packed array, |
27becfc8 | 1603 | we need to have the bits left justified on big-endian targets |
1604 | and right justified on little-endian targets. We also need to | |
1605 | ensure that when the value is read (e.g. for comparison of two | |
1606 | such values), we only get the good bits, since the unused bits | |
62f026a2 | 1607 | are uninitialized. Both goals are accomplished by wrapping up |
1608 | the modular type in an enclosing record type. */ | |
27becfc8 | 1609 | if (Is_Packed_Array_Type (gnat_entity) |
69c2baa9 | 1610 | && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))) |
27becfc8 | 1611 | { |
62f026a2 | 1612 | tree gnu_field_type, gnu_field; |
27becfc8 | 1613 | |
62f026a2 | 1614 | /* Set the RM size before wrapping up the type. */ |
a9538d68 | 1615 | SET_TYPE_RM_SIZE (gnu_type, |
1616 | UI_To_gnu (RM_Size (gnat_entity), bitsizetype)); | |
62f026a2 | 1617 | TYPE_PACKED_ARRAY_TYPE_P (gnu_type) = 1; |
1618 | gnu_field_type = gnu_type; | |
1619 | ||
27becfc8 | 1620 | gnu_type = make_node (RECORD_TYPE); |
1621 | TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "JM"); | |
1622 | ||
1623 | /* Propagate the alignment of the modular type to the record. | |
62f026a2 | 1624 | This means that bit-packed arrays have "ceil" alignment for |
27becfc8 | 1625 | their size, which may seem counter-intuitive but makes it |
1626 | possible to easily overlay them on modular types. */ | |
1627 | TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_field_type); | |
1628 | TYPE_PACKED (gnu_type) = 1; | |
1629 | ||
1630 | /* Create a stripped-down declaration of the original type, mainly | |
1631 | for debugging. */ | |
e3698827 | 1632 | create_type_decl (gnu_entity_name, gnu_field_type, NULL, true, |
153edb51 | 1633 | debug_info_p, gnat_entity); |
27becfc8 | 1634 | |
1635 | /* Don't notify the field as "addressable", since we won't be taking | |
1636 | it's address and it would prevent create_field_decl from making a | |
1637 | bitfield. */ | |
1638 | gnu_field = create_field_decl (get_identifier ("OBJECT"), | |
1639 | gnu_field_type, gnu_type, 1, 0, 0, 0); | |
1640 | ||
690b2030 | 1641 | /* Do not finalize it until after the parallel type is added. */ |
1642 | finish_record_type (gnu_type, gnu_field, 0, true); | |
27becfc8 | 1643 | TYPE_JUSTIFIED_MODULAR_P (gnu_type) = 1; |
27becfc8 | 1644 | |
892fdb03 | 1645 | relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY); |
690b2030 | 1646 | |
1647 | /* Make the original array type a parallel type. */ | |
1648 | if (debug_info_p | |
1649 | && present_gnu_tree (Original_Array_Type (gnat_entity))) | |
1650 | add_parallel_type (TYPE_STUB_DECL (gnu_type), | |
1651 | gnat_to_gnu_type | |
1652 | (Original_Array_Type (gnat_entity))); | |
1653 | ||
1654 | rest_of_record_type_compilation (gnu_type); | |
27becfc8 | 1655 | } |
1656 | ||
1657 | /* If the type we are dealing with has got a smaller alignment than the | |
1658 | natural one, we need to wrap it up in a record type and under-align | |
1659 | the latter. We reuse the padding machinery for this purpose. */ | |
d4b7e0f5 | 1660 | else if (Present (Alignment_Clause (gnat_entity)) |
27becfc8 | 1661 | && UI_Is_In_Int_Range (Alignment (gnat_entity)) |
1662 | && (align = UI_To_Int (Alignment (gnat_entity)) * BITS_PER_UNIT) | |
1663 | && align < TYPE_ALIGN (gnu_type)) | |
1664 | { | |
62f026a2 | 1665 | tree gnu_field_type, gnu_field; |
1666 | ||
1667 | /* Set the RM size before wrapping up the type. */ | |
a9538d68 | 1668 | SET_TYPE_RM_SIZE (gnu_type, |
1669 | UI_To_gnu (RM_Size (gnat_entity), bitsizetype)); | |
62f026a2 | 1670 | gnu_field_type = gnu_type; |
27becfc8 | 1671 | |
1672 | gnu_type = make_node (RECORD_TYPE); | |
1673 | TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "PAD"); | |
1674 | ||
1675 | TYPE_ALIGN (gnu_type) = align; | |
1676 | TYPE_PACKED (gnu_type) = 1; | |
1677 | ||
1678 | /* Create a stripped-down declaration of the original type, mainly | |
1679 | for debugging. */ | |
e3698827 | 1680 | create_type_decl (gnu_entity_name, gnu_field_type, NULL, true, |
153edb51 | 1681 | debug_info_p, gnat_entity); |
27becfc8 | 1682 | |
1683 | /* Don't notify the field as "addressable", since we won't be taking | |
1684 | it's address and it would prevent create_field_decl from making a | |
1685 | bitfield. */ | |
1686 | gnu_field = create_field_decl (get_identifier ("OBJECT"), | |
1687 | gnu_field_type, gnu_type, 1, 0, 0, 0); | |
1688 | ||
1689 | finish_record_type (gnu_type, gnu_field, 0, false); | |
1690 | TYPE_IS_PADDING_P (gnu_type) = 1; | |
27becfc8 | 1691 | |
892fdb03 | 1692 | relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY); |
27becfc8 | 1693 | } |
1694 | ||
1695 | /* Otherwise reset the alignment lest we computed it above. */ | |
1696 | else | |
1697 | align = 0; | |
1698 | ||
1699 | break; | |
1700 | ||
1701 | case E_Floating_Point_Type: | |
1702 | /* If this is a VAX floating-point type, use an integer of the proper | |
1703 | size. All the operations will be handled with ASM statements. */ | |
1704 | if (Vax_Float (gnat_entity)) | |
1705 | { | |
1706 | gnu_type = make_signed_type (esize); | |
1707 | TYPE_VAX_FLOATING_POINT_P (gnu_type) = 1; | |
1708 | SET_TYPE_DIGITS_VALUE (gnu_type, | |
1709 | UI_To_gnu (Digits_Value (gnat_entity), | |
1710 | sizetype)); | |
1711 | break; | |
1712 | } | |
1713 | ||
1714 | /* The type of the Low and High bounds can be our type if this is | |
1715 | a type from Standard, so set them at the end of the function. */ | |
1716 | gnu_type = make_node (REAL_TYPE); | |
1717 | TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize); | |
1718 | layout_type (gnu_type); | |
1719 | break; | |
1720 | ||
1721 | case E_Floating_Point_Subtype: | |
1722 | if (Vax_Float (gnat_entity)) | |
1723 | { | |
1724 | gnu_type = gnat_to_gnu_type (Etype (gnat_entity)); | |
1725 | break; | |
1726 | } | |
1727 | ||
1728 | { | |
1729 | if (!definition | |
1730 | && Present (Ancestor_Subtype (gnat_entity)) | |
1731 | && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity)) | |
1732 | && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity)) | |
1733 | || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity)))) | |
1734 | gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity), | |
1735 | gnu_expr, 0); | |
1736 | ||
1737 | gnu_type = make_node (REAL_TYPE); | |
1738 | TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity)); | |
1739 | TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize); | |
a9538d68 | 1740 | TYPE_GCC_MIN_VALUE (gnu_type) |
1741 | = TYPE_GCC_MIN_VALUE (TREE_TYPE (gnu_type)); | |
1742 | TYPE_GCC_MAX_VALUE (gnu_type) | |
1743 | = TYPE_GCC_MAX_VALUE (TREE_TYPE (gnu_type)); | |
1744 | layout_type (gnu_type); | |
27becfc8 | 1745 | |
a9538d68 | 1746 | SET_TYPE_RM_MIN_VALUE |
1747 | (gnu_type, | |
1748 | convert (TREE_TYPE (gnu_type), | |
1749 | elaborate_expression (Type_Low_Bound (gnat_entity), | |
1750 | gnat_entity, get_identifier ("L"), | |
1751 | definition, true, | |
1752 | Needs_Debug_Info (gnat_entity)))); | |
1753 | ||
1754 | SET_TYPE_RM_MAX_VALUE | |
1755 | (gnu_type, | |
1756 | convert (TREE_TYPE (gnu_type), | |
1757 | elaborate_expression (Type_High_Bound (gnat_entity), | |
1758 | gnat_entity, get_identifier ("U"), | |
1759 | definition, true, | |
1760 | Needs_Debug_Info (gnat_entity)))); | |
27becfc8 | 1761 | |
1762 | /* One of the above calls might have caused us to be elaborated, | |
1763 | so don't blow up if so. */ | |
1764 | if (present_gnu_tree (gnat_entity)) | |
1765 | { | |
1766 | maybe_present = true; | |
1767 | break; | |
1768 | } | |
1769 | ||
27becfc8 | 1770 | /* Inherit our alias set from what we're a subtype of, as for |
1771 | integer subtypes. */ | |
892fdb03 | 1772 | relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY); |
27becfc8 | 1773 | } |
1774 | break; | |
1775 | ||
1776 | /* Array and String Types and Subtypes | |
1777 | ||
1778 | Unconstrained array types are represented by E_Array_Type and | |
1779 | constrained array types are represented by E_Array_Subtype. There | |
1780 | are no actual objects of an unconstrained array type; all we have | |
1781 | are pointers to that type. | |
1782 | ||
1783 | The following fields are defined on array types and subtypes: | |
1784 | ||
1785 | Component_Type Component type of the array. | |
1786 | Number_Dimensions Number of dimensions (an int). | |
1787 | First_Index Type of first index. */ | |
1788 | ||
1789 | case E_String_Type: | |
1790 | case E_Array_Type: | |
1791 | { | |
0fbac54a | 1792 | Entity_Id gnat_ind_subtype; |
1793 | Entity_Id gnat_ind_base_subtype; | |
27becfc8 | 1794 | int ndim = Number_Dimensions (gnat_entity); |
0fbac54a | 1795 | int first_dim |
27becfc8 | 1796 | = (Convention (gnat_entity) == Convention_Fortran) ? ndim - 1 : 0; |
0fbac54a | 1797 | int next_dim |
27becfc8 | 1798 | = (Convention (gnat_entity) == Convention_Fortran) ? - 1 : 1; |
1799 | int index; | |
0fbac54a | 1800 | tree gnu_template_fields = NULL_TREE; |
1801 | tree gnu_template_type = make_node (RECORD_TYPE); | |
27becfc8 | 1802 | tree gnu_template_reference; |
0fbac54a | 1803 | tree gnu_ptr_template = build_pointer_type (gnu_template_type); |
1804 | tree gnu_fat_type = make_node (RECORD_TYPE); | |
1805 | tree *gnu_index_types = (tree *) alloca (ndim * sizeof (tree)); | |
1806 | tree *gnu_temp_fields = (tree *) alloca (ndim * sizeof (tree)); | |
1807 | tree gnu_max_size = size_one_node, gnu_max_size_unit; | |
1808 | tree gnu_comp_size, tem; | |
27becfc8 | 1809 | |
1810 | TYPE_NAME (gnu_template_type) | |
1811 | = create_concat_name (gnat_entity, "XUB"); | |
1812 | ||
1813 | /* Make a node for the array. If we are not defining the array | |
1814 | suppress expanding incomplete types. */ | |
1815 | gnu_type = make_node (UNCONSTRAINED_ARRAY_TYPE); | |
1816 | ||
1817 | if (!definition) | |
1818 | defer_incomplete_level++, this_deferred = true; | |
1819 | ||
1820 | /* Build the fat pointer type. Use a "void *" object instead of | |
1821 | a pointer to the array type since we don't have the array type | |
1822 | yet (it will reference the fat pointer via the bounds). */ | |
1823 | tem = chainon (chainon (NULL_TREE, | |
1824 | create_field_decl (get_identifier ("P_ARRAY"), | |
1825 | ptr_void_type_node, | |
1826 | gnu_fat_type, 0, 0, 0, 0)), | |
1827 | create_field_decl (get_identifier ("P_BOUNDS"), | |
1828 | gnu_ptr_template, | |
1829 | gnu_fat_type, 0, 0, 0, 0)); | |
1830 | ||
1831 | /* Make sure we can put this into a register. */ | |
1832 | TYPE_ALIGN (gnu_fat_type) = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE); | |
1833 | ||
1834 | /* Do not finalize this record type since the types of its fields | |
1835 | are still incomplete at this point. */ | |
1836 | finish_record_type (gnu_fat_type, tem, 0, true); | |
1837 | TYPE_IS_FAT_POINTER_P (gnu_fat_type) = 1; | |
1838 | ||
1839 | /* Build a reference to the template from a PLACEHOLDER_EXPR that | |
1840 | is the fat pointer. This will be used to access the individual | |
1841 | fields once we build them. */ | |
1842 | tem = build3 (COMPONENT_REF, gnu_ptr_template, | |
1843 | build0 (PLACEHOLDER_EXPR, gnu_fat_type), | |
1844 | TREE_CHAIN (TYPE_FIELDS (gnu_fat_type)), NULL_TREE); | |
1845 | gnu_template_reference | |
1846 | = build_unary_op (INDIRECT_REF, gnu_template_type, tem); | |
1847 | TREE_READONLY (gnu_template_reference) = 1; | |
1848 | ||
1849 | /* Now create the GCC type for each index and add the fields for | |
1850 | that index to the template. */ | |
0fbac54a | 1851 | for (index = first_dim, gnat_ind_subtype = First_Index (gnat_entity), |
27becfc8 | 1852 | gnat_ind_base_subtype |
1853 | = First_Index (Implementation_Base_Type (gnat_entity)); | |
1854 | index < ndim && index >= 0; | |
0fbac54a | 1855 | index += next_dim, |
27becfc8 | 1856 | gnat_ind_subtype = Next_Index (gnat_ind_subtype), |
1857 | gnat_ind_base_subtype = Next_Index (gnat_ind_base_subtype)) | |
1858 | { | |
1859 | char field_name[10]; | |
1860 | tree gnu_ind_subtype | |
1861 | = get_unpadded_type (Base_Type (Etype (gnat_ind_subtype))); | |
1862 | tree gnu_base_subtype | |
1863 | = get_unpadded_type (Etype (gnat_ind_base_subtype)); | |
1864 | tree gnu_base_min | |
1865 | = convert (sizetype, TYPE_MIN_VALUE (gnu_base_subtype)); | |
1866 | tree gnu_base_max | |
1867 | = convert (sizetype, TYPE_MAX_VALUE (gnu_base_subtype)); | |
1868 | tree gnu_min_field, gnu_max_field, gnu_min, gnu_max; | |
1869 | ||
1870 | /* Make the FIELD_DECLs for the minimum and maximum of this | |
1871 | type and then make extractions of that field from the | |
1872 | template. */ | |
1873 | sprintf (field_name, "LB%d", index); | |
1874 | gnu_min_field = create_field_decl (get_identifier (field_name), | |
1875 | gnu_ind_subtype, | |
1876 | gnu_template_type, 0, 0, 0, 0); | |
1877 | field_name[0] = 'U'; | |
1878 | gnu_max_field = create_field_decl (get_identifier (field_name), | |
1879 | gnu_ind_subtype, | |
1880 | gnu_template_type, 0, 0, 0, 0); | |
1881 | ||
1882 | Sloc_to_locus (Sloc (gnat_entity), | |
1883 | &DECL_SOURCE_LOCATION (gnu_min_field)); | |
1884 | Sloc_to_locus (Sloc (gnat_entity), | |
1885 | &DECL_SOURCE_LOCATION (gnu_max_field)); | |
1886 | gnu_temp_fields[index] = chainon (gnu_min_field, gnu_max_field); | |
1887 | ||
1888 | /* We can't use build_component_ref here since the template | |
1889 | type isn't complete yet. */ | |
1890 | gnu_min = build3 (COMPONENT_REF, gnu_ind_subtype, | |
1891 | gnu_template_reference, gnu_min_field, | |
1892 | NULL_TREE); | |
1893 | gnu_max = build3 (COMPONENT_REF, gnu_ind_subtype, | |
1894 | gnu_template_reference, gnu_max_field, | |
1895 | NULL_TREE); | |
1896 | TREE_READONLY (gnu_min) = TREE_READONLY (gnu_max) = 1; | |
1897 | ||
1898 | /* Make a range type with the new ranges, but using | |
1899 | the Ada subtype. Then we convert to sizetype. */ | |
1900 | gnu_index_types[index] | |
1901 | = create_index_type (convert (sizetype, gnu_min), | |
1902 | convert (sizetype, gnu_max), | |
a9538d68 | 1903 | create_range_type (gnu_ind_subtype, |
1904 | gnu_min, gnu_max), | |
27becfc8 | 1905 | gnat_entity); |
ea5ec53d | 1906 | /* Update the maximum size of the array, in elements. */ |
27becfc8 | 1907 | gnu_max_size |
1908 | = size_binop (MULT_EXPR, gnu_max_size, | |
1909 | size_binop (PLUS_EXPR, size_one_node, | |
1910 | size_binop (MINUS_EXPR, gnu_base_max, | |
1911 | gnu_base_min))); | |
1912 | ||
1913 | TYPE_NAME (gnu_index_types[index]) | |
1914 | = create_concat_name (gnat_entity, field_name); | |
1915 | } | |
1916 | ||
1917 | for (index = 0; index < ndim; index++) | |
1918 | gnu_template_fields | |
1919 | = chainon (gnu_template_fields, gnu_temp_fields[index]); | |
1920 | ||
1921 | /* Install all the fields into the template. */ | |
1922 | finish_record_type (gnu_template_type, gnu_template_fields, 0, false); | |
1923 | TYPE_READONLY (gnu_template_type) = 1; | |
1924 | ||
1925 | /* Now make the array of arrays and update the pointer to the array | |
1926 | in the fat pointer. Note that it is the first field. */ | |
1927 | tem = gnat_to_gnu_type (Component_Type (gnat_entity)); | |
1928 | ||
1929 | /* Try to get a smaller form of the component if needed. */ | |
1930 | if ((Is_Packed (gnat_entity) | |
1931 | || Has_Component_Size_Clause (gnat_entity)) | |
1932 | && !Is_Bit_Packed_Array (gnat_entity) | |
1933 | && !Has_Aliased_Components (gnat_entity) | |
1934 | && !Strict_Alignment (Component_Type (gnat_entity)) | |
1935 | && TREE_CODE (tem) == RECORD_TYPE | |
f6b2b596 | 1936 | && !TYPE_IS_FAT_POINTER_P (tem) |
27becfc8 | 1937 | && host_integerp (TYPE_SIZE (tem), 1)) |
1938 | tem = make_packable_type (tem, false); | |
1939 | ||
1940 | if (Has_Atomic_Components (gnat_entity)) | |
1941 | check_ok_for_atomic (tem, gnat_entity, true); | |
1942 | ||
1943 | /* Get and validate any specified Component_Size, but if Packed, | |
ea5ec53d | 1944 | ignore it since the front end will have taken care of it. */ |
27becfc8 | 1945 | gnu_comp_size |
1946 | = validate_size (Component_Size (gnat_entity), tem, | |
1947 | gnat_entity, | |
1948 | (Is_Bit_Packed_Array (gnat_entity) | |
1949 | ? TYPE_DECL : VAR_DECL), | |
1950 | true, Has_Component_Size_Clause (gnat_entity)); | |
1951 | ||
1952 | /* If the component type is a RECORD_TYPE that has a self-referential | |
bf3e1520 | 1953 | size, use the maximum size. */ |
0fbac54a | 1954 | if (!gnu_comp_size |
1955 | && TREE_CODE (tem) == RECORD_TYPE | |
27becfc8 | 1956 | && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (tem))) |
1957 | gnu_comp_size = max_size (TYPE_SIZE (tem), true); | |
1958 | ||
1959 | if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_entity)) | |
1960 | { | |
77129ada | 1961 | tree orig_tem = tem; |
1962 | unsigned int max_align; | |
1963 | ||
1964 | /* If an alignment is specified, use it as a cap on the component | |
1965 | type so that it can be honored for the whole type. But ignore | |
1966 | it for the original type of packed array types. */ | |
1967 | if (No (Packed_Array_Type (gnat_entity)) | |
1968 | && Known_Alignment (gnat_entity)) | |
1969 | max_align = validate_alignment (Alignment (gnat_entity), | |
1970 | gnat_entity, 0); | |
1971 | else | |
1972 | max_align = 0; | |
1973 | ||
27becfc8 | 1974 | tem = make_type_from_size (tem, gnu_comp_size, false); |
77129ada | 1975 | if (max_align > 0 && TYPE_ALIGN (tem) > max_align) |
1976 | tem = orig_tem; | |
1977 | else | |
1978 | orig_tem = tem; | |
1979 | ||
27becfc8 | 1980 | tem = maybe_pad_type (tem, gnu_comp_size, 0, gnat_entity, |
1981 | "C_PAD", false, definition, true); | |
77129ada | 1982 | |
27becfc8 | 1983 | /* If a padding record was made, declare it now since it will |
1984 | never be declared otherwise. This is necessary to ensure | |
1985 | that its subtrees are properly marked. */ | |
1986 | if (tem != orig_tem) | |
79e18c7c | 1987 | create_type_decl (TYPE_NAME (tem), tem, NULL, true, |
1988 | debug_info_p, gnat_entity); | |
27becfc8 | 1989 | } |
1990 | ||
1991 | if (Has_Volatile_Components (gnat_entity)) | |
1992 | tem = build_qualified_type (tem, | |
1993 | TYPE_QUALS (tem) | TYPE_QUAL_VOLATILE); | |
1994 | ||
1995 | /* If Component_Size is not already specified, annotate it with the | |
1996 | size of the component. */ | |
1997 | if (Unknown_Component_Size (gnat_entity)) | |
1998 | Set_Component_Size (gnat_entity, annotate_value (TYPE_SIZE (tem))); | |
1999 | ||
2000 | gnu_max_size_unit = size_binop (MAX_EXPR, size_zero_node, | |
2001 | size_binop (MULT_EXPR, gnu_max_size, | |
2002 | TYPE_SIZE_UNIT (tem))); | |
2003 | gnu_max_size = size_binop (MAX_EXPR, bitsize_zero_node, | |
2004 | size_binop (MULT_EXPR, | |
2005 | convert (bitsizetype, | |
2006 | gnu_max_size), | |
2007 | TYPE_SIZE (tem))); | |
2008 | ||
2009 | for (index = ndim - 1; index >= 0; index--) | |
2010 | { | |
2011 | tem = build_array_type (tem, gnu_index_types[index]); | |
2012 | TYPE_MULTI_ARRAY_P (tem) = (index > 0); | |
2013 | if (array_type_has_nonaliased_component (gnat_entity, tem)) | |
2014 | TYPE_NONALIASED_COMPONENT (tem) = 1; | |
2015 | } | |
2016 | ||
4880a940 | 2017 | /* If an alignment is specified, use it if valid. But ignore it |
2018 | for the original type of packed array types. If the alignment | |
2019 | was requested with an explicit alignment clause, state so. */ | |
27becfc8 | 2020 | if (No (Packed_Array_Type (gnat_entity)) |
2021 | && Known_Alignment (gnat_entity)) | |
2022 | { | |
27becfc8 | 2023 | TYPE_ALIGN (tem) |
2024 | = validate_alignment (Alignment (gnat_entity), gnat_entity, | |
2025 | TYPE_ALIGN (tem)); | |
2026 | if (Present (Alignment_Clause (gnat_entity))) | |
2027 | TYPE_USER_ALIGN (tem) = 1; | |
2028 | } | |
2029 | ||
2030 | TYPE_CONVENTION_FORTRAN_P (tem) | |
2031 | = (Convention (gnat_entity) == Convention_Fortran); | |
2032 | TREE_TYPE (TYPE_FIELDS (gnu_fat_type)) = build_pointer_type (tem); | |
2033 | ||
2034 | /* The result type is an UNCONSTRAINED_ARRAY_TYPE that indicates the | |
2035 | corresponding fat pointer. */ | |
2036 | TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type) | |
2037 | = TYPE_REFERENCE_TO (gnu_type) = gnu_fat_type; | |
3a2a1581 | 2038 | SET_TYPE_MODE (gnu_type, BLKmode); |
27becfc8 | 2039 | TYPE_ALIGN (gnu_type) = TYPE_ALIGN (tem); |
2040 | SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type, gnu_type); | |
2041 | ||
2042 | /* If the maximum size doesn't overflow, use it. */ | |
2043 | if (TREE_CODE (gnu_max_size) == INTEGER_CST | |
2044 | && !TREE_OVERFLOW (gnu_max_size)) | |
2045 | TYPE_SIZE (tem) | |
2046 | = size_binop (MIN_EXPR, gnu_max_size, TYPE_SIZE (tem)); | |
2047 | if (TREE_CODE (gnu_max_size_unit) == INTEGER_CST | |
2048 | && !TREE_OVERFLOW (gnu_max_size_unit)) | |
2049 | TYPE_SIZE_UNIT (tem) | |
2050 | = size_binop (MIN_EXPR, gnu_max_size_unit, | |
2051 | TYPE_SIZE_UNIT (tem)); | |
2052 | ||
2053 | create_type_decl (create_concat_name (gnat_entity, "XUA"), | |
2054 | tem, NULL, !Comes_From_Source (gnat_entity), | |
2055 | debug_info_p, gnat_entity); | |
2056 | ||
2057 | /* Give the fat pointer type a name. */ | |
2058 | create_type_decl (create_concat_name (gnat_entity, "XUP"), | |
515c6c6c | 2059 | gnu_fat_type, NULL, true, |
27becfc8 | 2060 | debug_info_p, gnat_entity); |
2061 | ||
2062 | /* Create the type to be used as what a thin pointer designates: an | |
2063 | record type for the object and its template with the field offsets | |
2064 | shifted to have the template at a negative offset. */ | |
2065 | tem = build_unc_object_type (gnu_template_type, tem, | |
2066 | create_concat_name (gnat_entity, "XUT")); | |
2067 | shift_unc_components_for_thin_pointers (tem); | |
2068 | ||
2069 | SET_TYPE_UNCONSTRAINED_ARRAY (tem, gnu_type); | |
2070 | TYPE_OBJECT_RECORD_TYPE (gnu_type) = tem; | |
2071 | ||
2072 | /* Give the thin pointer type a name. */ | |
2073 | create_type_decl (create_concat_name (gnat_entity, "XUX"), | |
515c6c6c | 2074 | build_pointer_type (tem), NULL, true, |
2075 | debug_info_p, gnat_entity); | |
27becfc8 | 2076 | } |
2077 | break; | |
2078 | ||
2079 | case E_String_Subtype: | |
2080 | case E_Array_Subtype: | |
2081 | ||
2082 | /* This is the actual data type for array variables. Multidimensional | |
2083 | arrays are implemented in the gnu tree as arrays of arrays. Note | |
2084 | that for the moment arrays which have sparse enumeration subtypes as | |
2085 | index components create sparse arrays, which is obviously space | |
2086 | inefficient but so much easier to code for now. | |
2087 | ||
2088 | Also note that the subtype never refers to the unconstrained | |
2089 | array type, which is somewhat at variance with Ada semantics. | |
2090 | ||
2091 | First check to see if this is simply a renaming of the array | |
2092 | type. If so, the result is the array type. */ | |
2093 | ||
2094 | gnu_type = gnat_to_gnu_type (Etype (gnat_entity)); | |
2095 | if (!Is_Constrained (gnat_entity)) | |
2096 | break; | |
2097 | else | |
2098 | { | |
0fbac54a | 2099 | Entity_Id gnat_ind_subtype; |
2100 | Entity_Id gnat_ind_base_subtype; | |
2101 | int dim = Number_Dimensions (gnat_entity); | |
27becfc8 | 2102 | int first_dim |
0fbac54a | 2103 | = (Convention (gnat_entity) == Convention_Fortran) ? dim - 1 : 0; |
27becfc8 | 2104 | int next_dim |
2105 | = (Convention (gnat_entity) == Convention_Fortran) ? -1 : 1; | |
0fbac54a | 2106 | int index; |
27becfc8 | 2107 | tree gnu_base_type = gnu_type; |
0fbac54a | 2108 | tree *gnu_index_type = (tree *) alloca (dim * sizeof (tree)); |
2109 | tree gnu_max_size = size_one_node, gnu_max_size_unit; | |
27becfc8 | 2110 | bool need_index_type_struct = false; |
2111 | bool max_overflow = false; | |
2112 | ||
2113 | /* First create the gnu types for each index. Create types for | |
2114 | debugging information to point to the index types if the | |
2115 | are not integer types, have variable bounds, or are | |
2116 | wider than sizetype. */ | |
2117 | ||
2118 | for (index = first_dim, gnat_ind_subtype = First_Index (gnat_entity), | |
2119 | gnat_ind_base_subtype | |
2120 | = First_Index (Implementation_Base_Type (gnat_entity)); | |
0fbac54a | 2121 | index < dim && index >= 0; |
27becfc8 | 2122 | index += next_dim, |
2123 | gnat_ind_subtype = Next_Index (gnat_ind_subtype), | |
2124 | gnat_ind_base_subtype = Next_Index (gnat_ind_base_subtype)) | |
2125 | { | |
2126 | tree gnu_index_subtype | |
2127 | = get_unpadded_type (Etype (gnat_ind_subtype)); | |
2128 | tree gnu_min | |
2129 | = convert (sizetype, TYPE_MIN_VALUE (gnu_index_subtype)); | |
2130 | tree gnu_max | |
2131 | = convert (sizetype, TYPE_MAX_VALUE (gnu_index_subtype)); | |
2132 | tree gnu_base_subtype | |
2133 | = get_unpadded_type (Etype (gnat_ind_base_subtype)); | |
2134 | tree gnu_base_min | |
2135 | = convert (sizetype, TYPE_MIN_VALUE (gnu_base_subtype)); | |
2136 | tree gnu_base_max | |
2137 | = convert (sizetype, TYPE_MAX_VALUE (gnu_base_subtype)); | |
2138 | tree gnu_base_type = get_base_type (gnu_base_subtype); | |
2139 | tree gnu_base_base_min | |
2140 | = convert (sizetype, TYPE_MIN_VALUE (gnu_base_type)); | |
2141 | tree gnu_base_base_max | |
2142 | = convert (sizetype, TYPE_MAX_VALUE (gnu_base_type)); | |
2143 | tree gnu_high; | |
2144 | tree gnu_this_max; | |
2145 | ||
2146 | /* If the minimum and maximum values both overflow in | |
2147 | SIZETYPE, but the difference in the original type | |
2148 | does not overflow in SIZETYPE, ignore the overflow | |
2149 | indications. */ | |
2150 | if ((TYPE_PRECISION (gnu_index_subtype) | |
2151 | > TYPE_PRECISION (sizetype) | |
2152 | || TYPE_UNSIGNED (gnu_index_subtype) | |
2153 | != TYPE_UNSIGNED (sizetype)) | |
2154 | && TREE_CODE (gnu_min) == INTEGER_CST | |
2155 | && TREE_CODE (gnu_max) == INTEGER_CST | |
2156 | && TREE_OVERFLOW (gnu_min) && TREE_OVERFLOW (gnu_max) | |
4880a940 | 2157 | && !TREE_OVERFLOW |
27becfc8 | 2158 | (fold_build2 (MINUS_EXPR, gnu_index_subtype, |
2159 | TYPE_MAX_VALUE (gnu_index_subtype), | |
4880a940 | 2160 | TYPE_MIN_VALUE (gnu_index_subtype)))) |
27becfc8 | 2161 | { |
2162 | TREE_OVERFLOW (gnu_min) = 0; | |
2163 | TREE_OVERFLOW (gnu_max) = 0; | |
4880a940 | 2164 | if (tree_int_cst_lt (gnu_max, gnu_min)) |
2165 | { | |
2166 | gnu_min = size_one_node; | |
2167 | gnu_max = size_zero_node; | |
2168 | } | |
2169 | gnu_high = gnu_max; | |
27becfc8 | 2170 | } |
2171 | ||
2172 | /* Similarly, if the range is null, use bounds of 1..0 for | |
2173 | the sizetype bounds. */ | |
2174 | else if ((TYPE_PRECISION (gnu_index_subtype) | |
2175 | > TYPE_PRECISION (sizetype) | |
4880a940 | 2176 | || TYPE_UNSIGNED (gnu_index_subtype) |
2177 | != TYPE_UNSIGNED (sizetype)) | |
27becfc8 | 2178 | && TREE_CODE (gnu_min) == INTEGER_CST |
2179 | && TREE_CODE (gnu_max) == INTEGER_CST | |
2180 | && (TREE_OVERFLOW (gnu_min) || TREE_OVERFLOW (gnu_max)) | |
2181 | && tree_int_cst_lt (TYPE_MAX_VALUE (gnu_index_subtype), | |
2182 | TYPE_MIN_VALUE (gnu_index_subtype))) | |
4880a940 | 2183 | { |
2184 | gnu_min = size_one_node; | |
2185 | gnu_max = size_zero_node; | |
2186 | gnu_high = gnu_max; | |
2187 | } | |
27becfc8 | 2188 | |
2189 | /* See if the base array type is already flat. If it is, we | |
4880a940 | 2190 | are probably compiling an ACATS test, but it will cause the |
27becfc8 | 2191 | code below to malfunction if we don't handle it specially. */ |
4880a940 | 2192 | else if (TREE_CODE (gnu_base_min) == INTEGER_CST |
2193 | && TREE_CODE (gnu_base_max) == INTEGER_CST | |
2194 | && !TREE_OVERFLOW (gnu_base_min) | |
2195 | && !TREE_OVERFLOW (gnu_base_max) | |
2196 | && tree_int_cst_lt (gnu_base_max, gnu_base_min)) | |
2197 | { | |
2198 | gnu_min = size_one_node; | |
2199 | gnu_max = size_zero_node; | |
2200 | gnu_high = gnu_max; | |
2201 | } | |
2202 | ||
27becfc8 | 2203 | else |
4880a940 | 2204 | { |
2205 | /* Now compute the size of this bound. We need to provide | |
2206 | GCC with an upper bound to use but have to deal with the | |
2207 | "superflat" case. There are three ways to do this. If | |
2208 | we can prove that the array can never be superflat, we | |
2209 | can just use the high bound of the index subtype. If we | |
2210 | can prove that the low bound minus one can't overflow, | |
2211 | we can do this as MAX (hb, lb - 1). Otherwise, we have | |
2212 | to use the expression hb >= lb ? hb : lb - 1. */ | |
2213 | gnu_high = size_binop (MINUS_EXPR, gnu_min, size_one_node); | |
2214 | ||
2215 | /* If gnu_high is now an integer which overflowed, the array | |
2216 | cannot be superflat. */ | |
2217 | if (TREE_CODE (gnu_high) == INTEGER_CST | |
2218 | && TREE_OVERFLOW (gnu_high)) | |
2219 | gnu_high = gnu_max; | |
2220 | ||
2221 | /* gnu_high cannot overflow if the subtype is unsigned since | |
2222 | sizetype is signed, or if it is now a constant that hasn't | |
2223 | overflowed. */ | |
2224 | else if (TYPE_UNSIGNED (gnu_base_subtype) | |
2225 | || TREE_CODE (gnu_high) == INTEGER_CST) | |
2226 | gnu_high = size_binop (MAX_EXPR, gnu_max, gnu_high); | |
2227 | ||
2228 | else | |
2229 | gnu_high | |
2230 | = build_cond_expr (sizetype, | |
2231 | build_binary_op (GE_EXPR, | |
2232 | integer_type_node, | |
2233 | gnu_max, gnu_min), | |
2234 | gnu_max, gnu_high); | |
2235 | } | |
27becfc8 | 2236 | |
2237 | gnu_index_type[index] | |
2238 | = create_index_type (gnu_min, gnu_high, gnu_index_subtype, | |
2239 | gnat_entity); | |
2240 | ||
2241 | /* Also compute the maximum size of the array. Here we | |
2242 | see if any constraint on the index type of the base type | |
2243 | can be used in the case of self-referential bound on | |
2244 | the index type of the subtype. We look for a non-"infinite" | |
2245 | and non-self-referential bound from any type involved and | |
2246 | handle each bound separately. */ | |
2247 | ||
2248 | if ((TREE_CODE (gnu_min) == INTEGER_CST | |
2249 | && !TREE_OVERFLOW (gnu_min) | |
2250 | && !operand_equal_p (gnu_min, gnu_base_base_min, 0)) | |
2251 | || !CONTAINS_PLACEHOLDER_P (gnu_min) | |
2252 | || !(TREE_CODE (gnu_base_min) == INTEGER_CST | |
2253 | && !TREE_OVERFLOW (gnu_base_min))) | |
2254 | gnu_base_min = gnu_min; | |
2255 | ||
2256 | if ((TREE_CODE (gnu_max) == INTEGER_CST | |
2257 | && !TREE_OVERFLOW (gnu_max) | |
2258 | && !operand_equal_p (gnu_max, gnu_base_base_max, 0)) | |
2259 | || !CONTAINS_PLACEHOLDER_P (gnu_max) | |
2260 | || !(TREE_CODE (gnu_base_max) == INTEGER_CST | |
2261 | && !TREE_OVERFLOW (gnu_base_max))) | |
2262 | gnu_base_max = gnu_max; | |
2263 | ||
2264 | if ((TREE_CODE (gnu_base_min) == INTEGER_CST | |
2265 | && TREE_OVERFLOW (gnu_base_min)) | |
2266 | || operand_equal_p (gnu_base_min, gnu_base_base_min, 0) | |
2267 | || (TREE_CODE (gnu_base_max) == INTEGER_CST | |
2268 | && TREE_OVERFLOW (gnu_base_max)) | |
2269 | || operand_equal_p (gnu_base_max, gnu_base_base_max, 0)) | |
2270 | max_overflow = true; | |
2271 | ||
2272 | gnu_base_min = size_binop (MAX_EXPR, gnu_base_min, gnu_min); | |
2273 | gnu_base_max = size_binop (MIN_EXPR, gnu_base_max, gnu_max); | |
2274 | ||
2275 | gnu_this_max | |
2276 | = size_binop (MAX_EXPR, | |
2277 | size_binop (PLUS_EXPR, size_one_node, | |
2278 | size_binop (MINUS_EXPR, gnu_base_max, | |
2279 | gnu_base_min)), | |
2280 | size_zero_node); | |
2281 | ||
2282 | if (TREE_CODE (gnu_this_max) == INTEGER_CST | |
2283 | && TREE_OVERFLOW (gnu_this_max)) | |
2284 | max_overflow = true; | |
2285 | ||
2286 | gnu_max_size | |
2287 | = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max); | |
2288 | ||
2289 | if (!integer_onep (TYPE_MIN_VALUE (gnu_index_subtype)) | |
2290 | || (TREE_CODE (TYPE_MAX_VALUE (gnu_index_subtype)) | |
2291 | != INTEGER_CST) | |
2292 | || TREE_CODE (gnu_index_subtype) != INTEGER_TYPE | |
2293 | || (TREE_TYPE (gnu_index_subtype) | |
2294 | && (TREE_CODE (TREE_TYPE (gnu_index_subtype)) | |
2295 | != INTEGER_TYPE)) | |
2296 | || TYPE_BIASED_REPRESENTATION_P (gnu_index_subtype) | |
2297 | || (TYPE_PRECISION (gnu_index_subtype) | |
2298 | > TYPE_PRECISION (sizetype))) | |
2299 | need_index_type_struct = true; | |
2300 | } | |
2301 | ||
2302 | /* Then flatten: create the array of arrays. For an array type | |
2303 | used to implement a packed array, get the component type from | |
2304 | the original array type since the representation clauses that | |
2305 | can affect it are on the latter. */ | |
2306 | if (Is_Packed_Array_Type (gnat_entity) | |
2307 | && !Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))) | |
2308 | { | |
2309 | gnu_type = gnat_to_gnu_type (Original_Array_Type (gnat_entity)); | |
0fbac54a | 2310 | for (index = dim - 1; index >= 0; index--) |
27becfc8 | 2311 | gnu_type = TREE_TYPE (gnu_type); |
2312 | ||
2313 | /* One of the above calls might have caused us to be elaborated, | |
2314 | so don't blow up if so. */ | |
2315 | if (present_gnu_tree (gnat_entity)) | |
2316 | { | |
2317 | maybe_present = true; | |
2318 | break; | |
2319 | } | |
2320 | } | |
2321 | else | |
2322 | { | |
0fbac54a | 2323 | tree gnu_comp_size; |
2324 | ||
27becfc8 | 2325 | gnu_type = gnat_to_gnu_type (Component_Type (gnat_entity)); |
2326 | ||
2327 | /* One of the above calls might have caused us to be elaborated, | |
2328 | so don't blow up if so. */ | |
2329 | if (present_gnu_tree (gnat_entity)) | |
2330 | { | |
2331 | maybe_present = true; | |
2332 | break; | |
2333 | } | |
2334 | ||
2335 | /* Try to get a smaller form of the component if needed. */ | |
2336 | if ((Is_Packed (gnat_entity) | |
2337 | || Has_Component_Size_Clause (gnat_entity)) | |
2338 | && !Is_Bit_Packed_Array (gnat_entity) | |
2339 | && !Has_Aliased_Components (gnat_entity) | |
2340 | && !Strict_Alignment (Component_Type (gnat_entity)) | |
2341 | && TREE_CODE (gnu_type) == RECORD_TYPE | |
f6b2b596 | 2342 | && !TYPE_IS_FAT_POINTER_P (gnu_type) |
27becfc8 | 2343 | && host_integerp (TYPE_SIZE (gnu_type), 1)) |
2344 | gnu_type = make_packable_type (gnu_type, false); | |
2345 | ||
2346 | /* Get and validate any specified Component_Size, but if Packed, | |
ea5ec53d | 2347 | ignore it since the front end will have taken care of it. */ |
27becfc8 | 2348 | gnu_comp_size |
2349 | = validate_size (Component_Size (gnat_entity), gnu_type, | |
2350 | gnat_entity, | |
2351 | (Is_Bit_Packed_Array (gnat_entity) | |
2352 | ? TYPE_DECL : VAR_DECL), true, | |
2353 | Has_Component_Size_Clause (gnat_entity)); | |
2354 | ||
2355 | /* If the component type is a RECORD_TYPE that has a | |
bf3e1520 | 2356 | self-referential size, use the maximum size. */ |
27becfc8 | 2357 | if (!gnu_comp_size |
2358 | && TREE_CODE (gnu_type) == RECORD_TYPE | |
2359 | && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))) | |
2360 | gnu_comp_size = max_size (TYPE_SIZE (gnu_type), true); | |
2361 | ||
2362 | if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_entity)) | |
2363 | { | |
77129ada | 2364 | tree orig_gnu_type = gnu_type; |
2365 | unsigned int max_align; | |
2366 | ||
2367 | /* If an alignment is specified, use it as a cap on the | |
2368 | component type so that it can be honored for the whole | |
2369 | type. But ignore it for the original type of packed | |
2370 | array types. */ | |
2371 | if (No (Packed_Array_Type (gnat_entity)) | |
2372 | && Known_Alignment (gnat_entity)) | |
2373 | max_align = validate_alignment (Alignment (gnat_entity), | |
2374 | gnat_entity, 0); | |
2375 | else | |
2376 | max_align = 0; | |
2377 | ||
27becfc8 | 2378 | gnu_type |
2379 | = make_type_from_size (gnu_type, gnu_comp_size, false); | |
77129ada | 2380 | if (max_align > 0 && TYPE_ALIGN (gnu_type) > max_align) |
2381 | gnu_type = orig_gnu_type; | |
2382 | else | |
2383 | orig_gnu_type = gnu_type; | |
2384 | ||
27becfc8 | 2385 | gnu_type = maybe_pad_type (gnu_type, gnu_comp_size, 0, |
2386 | gnat_entity, "C_PAD", false, | |
2387 | definition, true); | |
77129ada | 2388 | |
27becfc8 | 2389 | /* If a padding record was made, declare it now since it |
2390 | will never be declared otherwise. This is necessary | |
2391 | to ensure that its subtrees are properly marked. */ | |
2392 | if (gnu_type != orig_gnu_type) | |
2393 | create_type_decl (TYPE_NAME (gnu_type), gnu_type, NULL, | |
79e18c7c | 2394 | true, debug_info_p, gnat_entity); |
27becfc8 | 2395 | } |
2396 | ||
2397 | if (Has_Volatile_Components (Base_Type (gnat_entity))) | |
2398 | gnu_type = build_qualified_type (gnu_type, | |
2399 | (TYPE_QUALS (gnu_type) | |
2400 | | TYPE_QUAL_VOLATILE)); | |
2401 | } | |
2402 | ||
2403 | gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size, | |
2404 | TYPE_SIZE_UNIT (gnu_type)); | |
2405 | gnu_max_size = size_binop (MULT_EXPR, | |
2406 | convert (bitsizetype, gnu_max_size), | |
2407 | TYPE_SIZE (gnu_type)); | |
2408 | ||
0fbac54a | 2409 | for (index = dim - 1; index >= 0; index --) |
27becfc8 | 2410 | { |
2411 | gnu_type = build_array_type (gnu_type, gnu_index_type[index]); | |
2412 | TYPE_MULTI_ARRAY_P (gnu_type) = (index > 0); | |
2413 | if (array_type_has_nonaliased_component (gnat_entity, gnu_type)) | |
2414 | TYPE_NONALIASED_COMPONENT (gnu_type) = 1; | |
2415 | } | |
2416 | ||
515c6c6c | 2417 | /* Attach the TYPE_STUB_DECL in case we have a parallel type. */ |
690b2030 | 2418 | TYPE_STUB_DECL (gnu_type) |
2419 | = create_type_stub_decl (gnu_entity_name, gnu_type); | |
515c6c6c | 2420 | |
27becfc8 | 2421 | /* If we are at file level and this is a multi-dimensional array, we |
2422 | need to make a variable corresponding to the stride of the | |
2423 | inner dimensions. */ | |
0fbac54a | 2424 | if (global_bindings_p () && dim > 1) |
27becfc8 | 2425 | { |
2426 | tree gnu_str_name = get_identifier ("ST"); | |
2427 | tree gnu_arr_type; | |
2428 | ||
2429 | for (gnu_arr_type = TREE_TYPE (gnu_type); | |
2430 | TREE_CODE (gnu_arr_type) == ARRAY_TYPE; | |
2431 | gnu_arr_type = TREE_TYPE (gnu_arr_type), | |
e3698827 | 2432 | gnu_str_name = concat_name (gnu_str_name, "ST")) |
27becfc8 | 2433 | { |
2434 | tree eltype = TREE_TYPE (gnu_arr_type); | |
2435 | ||
2436 | TYPE_SIZE (gnu_arr_type) | |
dd02c1ab | 2437 | = elaborate_expression_1 (TYPE_SIZE (gnu_arr_type), |
2438 | gnat_entity, gnu_str_name, | |
2439 | definition, false); | |
27becfc8 | 2440 | |
2441 | /* ??? For now, store the size as a multiple of the | |
2442 | alignment of the element type in bytes so that we | |
2443 | can see the alignment from the tree. */ | |
2444 | TYPE_SIZE_UNIT (gnu_arr_type) | |
2445 | = build_binary_op | |
2446 | (MULT_EXPR, sizetype, | |
2447 | elaborate_expression_1 | |
dd02c1ab | 2448 | (build_binary_op (EXACT_DIV_EXPR, sizetype, |
27becfc8 | 2449 | TYPE_SIZE_UNIT (gnu_arr_type), |
2450 | size_int (TYPE_ALIGN (eltype) | |
2451 | / BITS_PER_UNIT)), | |
dd02c1ab | 2452 | gnat_entity, concat_name (gnu_str_name, "A_U"), |
2453 | definition, false), | |
27becfc8 | 2454 | size_int (TYPE_ALIGN (eltype) / BITS_PER_UNIT)); |
2455 | ||
2456 | /* ??? create_type_decl is not invoked on the inner types so | |
2457 | the MULT_EXPR node built above will never be marked. */ | |
2458 | mark_visited (&TYPE_SIZE_UNIT (gnu_arr_type)); | |
2459 | } | |
2460 | } | |
2461 | ||
690b2030 | 2462 | /* If we need to write out a record type giving the names of the |
2463 | bounds for debugging purposes, do it now and make the record | |
2464 | type a parallel type. This is not needed for a packed array | |
2465 | since the bounds are conveyed by the original array type. */ | |
2466 | if (need_index_type_struct | |
2467 | && debug_info_p | |
2468 | && !Is_Packed_Array_Type (gnat_entity)) | |
27becfc8 | 2469 | { |
515c6c6c | 2470 | tree gnu_bound_rec = make_node (RECORD_TYPE); |
27becfc8 | 2471 | tree gnu_field_list = NULL_TREE; |
2472 | tree gnu_field; | |
2473 | ||
515c6c6c | 2474 | TYPE_NAME (gnu_bound_rec) |
27becfc8 | 2475 | = create_concat_name (gnat_entity, "XA"); |
2476 | ||
0fbac54a | 2477 | for (index = dim - 1; index >= 0; index--) |
27becfc8 | 2478 | { |
515c6c6c | 2479 | tree gnu_index = TYPE_INDEX_TYPE (gnu_index_type[index]); |
2480 | tree gnu_index_name = TYPE_NAME (gnu_index); | |
27becfc8 | 2481 | |
515c6c6c | 2482 | if (TREE_CODE (gnu_index_name) == TYPE_DECL) |
2483 | gnu_index_name = DECL_NAME (gnu_index_name); | |
27becfc8 | 2484 | |
690b2030 | 2485 | /* Make sure to reference the types themselves, and not just |
2486 | their names, as the debugger may fall back on them. */ | |
515c6c6c | 2487 | gnu_field = create_field_decl (gnu_index_name, gnu_index, |
2488 | gnu_bound_rec, | |
27becfc8 | 2489 | 0, NULL_TREE, NULL_TREE, 0); |
2490 | TREE_CHAIN (gnu_field) = gnu_field_list; | |
2491 | gnu_field_list = gnu_field; | |
2492 | } | |
2493 | ||
515c6c6c | 2494 | finish_record_type (gnu_bound_rec, gnu_field_list, 0, false); |
2495 | add_parallel_type (TYPE_STUB_DECL (gnu_type), gnu_bound_rec); | |
27becfc8 | 2496 | } |
2497 | ||
690b2030 | 2498 | /* Otherwise, for a packed array, make the original array type a |
2499 | parallel type. */ | |
2500 | else if (debug_info_p | |
2501 | && Is_Packed_Array_Type (gnat_entity) | |
2502 | && present_gnu_tree (Original_Array_Type (gnat_entity))) | |
2503 | add_parallel_type (TYPE_STUB_DECL (gnu_type), | |
2504 | gnat_to_gnu_type | |
2505 | (Original_Array_Type (gnat_entity))); | |
2506 | ||
27becfc8 | 2507 | TYPE_CONVENTION_FORTRAN_P (gnu_type) |
2508 | = (Convention (gnat_entity) == Convention_Fortran); | |
2509 | TYPE_PACKED_ARRAY_TYPE_P (gnu_type) | |
2510 | = (Is_Packed_Array_Type (gnat_entity) | |
2511 | && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))); | |
2512 | ||
2513 | /* If our size depends on a placeholder and the maximum size doesn't | |
2514 | overflow, use it. */ | |
2515 | if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)) | |
2516 | && !(TREE_CODE (gnu_max_size) == INTEGER_CST | |
2517 | && TREE_OVERFLOW (gnu_max_size)) | |
2518 | && !(TREE_CODE (gnu_max_size_unit) == INTEGER_CST | |
2519 | && TREE_OVERFLOW (gnu_max_size_unit)) | |
2520 | && !max_overflow) | |
2521 | { | |
2522 | TYPE_SIZE (gnu_type) = size_binop (MIN_EXPR, gnu_max_size, | |
2523 | TYPE_SIZE (gnu_type)); | |
2524 | TYPE_SIZE_UNIT (gnu_type) | |
2525 | = size_binop (MIN_EXPR, gnu_max_size_unit, | |
2526 | TYPE_SIZE_UNIT (gnu_type)); | |
2527 | } | |
2528 | ||
2529 | /* Set our alias set to that of our base type. This gives all | |
2530 | array subtypes the same alias set. */ | |
892fdb03 | 2531 | relate_alias_sets (gnu_type, gnu_base_type, ALIAS_SET_COPY); |
27becfc8 | 2532 | } |
2533 | ||
2534 | /* If this is a packed type, make this type the same as the packed | |
515c6c6c | 2535 | array type, but do some adjusting in the type first. */ |
27becfc8 | 2536 | if (Present (Packed_Array_Type (gnat_entity))) |
2537 | { | |
2538 | Entity_Id gnat_index; | |
2539 | tree gnu_inner_type; | |
2540 | ||
2541 | /* First finish the type we had been making so that we output | |
515c6c6c | 2542 | debugging information for it. */ |
27becfc8 | 2543 | gnu_type |
2544 | = build_qualified_type (gnu_type, | |
2545 | (TYPE_QUALS (gnu_type) | |
2546 | | (TYPE_QUAL_VOLATILE | |
2547 | * Treat_As_Volatile (gnat_entity)))); | |
515c6c6c | 2548 | |
62e71c36 | 2549 | /* Make it artificial only if the base type was artificial as well. |
2550 | That's sort of "morally" true and will make it possible for the | |
2551 | debugger to look it up by name in DWARF, which is necessary in | |
2552 | order to decode the packed array type. */ | |
515c6c6c | 2553 | gnu_decl |
e3698827 | 2554 | = create_type_decl (gnu_entity_name, gnu_type, attr_list, |
62e71c36 | 2555 | !Comes_From_Source (gnat_entity) |
2556 | && !Comes_From_Source (Etype (gnat_entity)), | |
515c6c6c | 2557 | debug_info_p, gnat_entity); |
27becfc8 | 2558 | |
2559 | /* Save it as our equivalent in case the call below elaborates | |
2560 | this type again. */ | |
2561 | save_gnu_tree (gnat_entity, gnu_decl, false); | |
2562 | ||
2563 | gnu_decl = gnat_to_gnu_entity (Packed_Array_Type (gnat_entity), | |
2564 | NULL_TREE, 0); | |
2565 | this_made_decl = true; | |
2566 | gnu_type = TREE_TYPE (gnu_decl); | |
2567 | save_gnu_tree (gnat_entity, NULL_TREE, false); | |
2568 | ||
2569 | gnu_inner_type = gnu_type; | |
2570 | while (TREE_CODE (gnu_inner_type) == RECORD_TYPE | |
2571 | && (TYPE_JUSTIFIED_MODULAR_P (gnu_inner_type) | |
2572 | || TYPE_IS_PADDING_P (gnu_inner_type))) | |
2573 | gnu_inner_type = TREE_TYPE (TYPE_FIELDS (gnu_inner_type)); | |
2574 | ||
0fbac54a | 2575 | /* We need to attach the index type to the type we just made so |
2576 | that the actual bounds can later be put into a template. */ | |
27becfc8 | 2577 | if ((TREE_CODE (gnu_inner_type) == ARRAY_TYPE |
2578 | && !TYPE_ACTUAL_BOUNDS (gnu_inner_type)) | |
2579 | || (TREE_CODE (gnu_inner_type) == INTEGER_TYPE | |
2580 | && !TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type))) | |
2581 | { | |
2582 | if (TREE_CODE (gnu_inner_type) == INTEGER_TYPE) | |
2583 | { | |
0fbac54a | 2584 | /* The TYPE_ACTUAL_BOUNDS field is overloaded with the |
2585 | TYPE_MODULUS for modular types so we make an extra | |
2586 | subtype if necessary. */ | |
27becfc8 | 2587 | if (TYPE_MODULAR_P (gnu_inner_type)) |
2588 | { | |
a9538d68 | 2589 | tree gnu_subtype |
2590 | = make_unsigned_type (TYPE_PRECISION (gnu_inner_type)); | |
27becfc8 | 2591 | TREE_TYPE (gnu_subtype) = gnu_inner_type; |
0fbac54a | 2592 | TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1; |
a9538d68 | 2593 | SET_TYPE_RM_MIN_VALUE (gnu_subtype, |
2594 | TYPE_MIN_VALUE (gnu_inner_type)); | |
2595 | SET_TYPE_RM_MAX_VALUE (gnu_subtype, | |
2596 | TYPE_MAX_VALUE (gnu_inner_type)); | |
27becfc8 | 2597 | gnu_inner_type = gnu_subtype; |
2598 | } | |
2599 | ||
2600 | TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type) = 1; | |
0fbac54a | 2601 | |
2602 | #ifdef ENABLE_CHECKING | |
2603 | /* Check for other cases of overloading. */ | |
2604 | gcc_assert (!TYPE_ACTUAL_BOUNDS (gnu_inner_type)); | |
2605 | #endif | |
27becfc8 | 2606 | } |
2607 | ||
0fbac54a | 2608 | /* ??? This is necessary to make sure that the container is |
2609 | allocated with a null tree upfront; otherwise, it could | |
2610 | be allocated with an uninitialized tree that is accessed | |
2611 | before being set below. See ada-tree.h for details. */ | |
27becfc8 | 2612 | SET_TYPE_ACTUAL_BOUNDS (gnu_inner_type, NULL_TREE); |
2613 | ||
2614 | for (gnat_index = First_Index (gnat_entity); | |
2615 | Present (gnat_index); gnat_index = Next_Index (gnat_index)) | |
2616 | SET_TYPE_ACTUAL_BOUNDS | |
2617 | (gnu_inner_type, | |
2618 | tree_cons (NULL_TREE, | |
2619 | get_unpadded_type (Etype (gnat_index)), | |
2620 | TYPE_ACTUAL_BOUNDS (gnu_inner_type))); | |
2621 | ||
2622 | if (Convention (gnat_entity) != Convention_Fortran) | |
2623 | SET_TYPE_ACTUAL_BOUNDS | |
2624 | (gnu_inner_type, | |
2625 | nreverse (TYPE_ACTUAL_BOUNDS (gnu_inner_type))); | |
2626 | ||
2627 | if (TREE_CODE (gnu_type) == RECORD_TYPE | |
2628 | && TYPE_JUSTIFIED_MODULAR_P (gnu_type)) | |
2629 | TREE_TYPE (TYPE_FIELDS (gnu_type)) = gnu_inner_type; | |
2630 | } | |
2631 | } | |
2632 | ||
ea5ec53d | 2633 | /* Abort if packed array with no packed array type field set. */ |
27becfc8 | 2634 | else |
2635 | gcc_assert (!Is_Packed (gnat_entity)); | |
2636 | ||
2637 | break; | |
2638 | ||
2639 | case E_String_Literal_Subtype: | |
ea5ec53d | 2640 | /* Create the type for a string literal. */ |
27becfc8 | 2641 | { |
2642 | Entity_Id gnat_full_type | |
2643 | = (IN (Ekind (Etype (gnat_entity)), Private_Kind) | |
2644 | && Present (Full_View (Etype (gnat_entity))) | |
2645 | ? Full_View (Etype (gnat_entity)) : Etype (gnat_entity)); | |
2646 | tree gnu_string_type = get_unpadded_type (gnat_full_type); | |
2647 | tree gnu_string_array_type | |
2648 | = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_string_type)))); | |
2649 | tree gnu_string_index_type | |
2650 | = get_base_type (TREE_TYPE (TYPE_INDEX_TYPE | |
2651 | (TYPE_DOMAIN (gnu_string_array_type)))); | |
2652 | tree gnu_lower_bound | |
2653 | = convert (gnu_string_index_type, | |
2654 | gnat_to_gnu (String_Literal_Low_Bound (gnat_entity))); | |
2655 | int length = UI_To_Int (String_Literal_Length (gnat_entity)); | |
2656 | tree gnu_length = ssize_int (length - 1); | |
2657 | tree gnu_upper_bound | |
2658 | = build_binary_op (PLUS_EXPR, gnu_string_index_type, | |
2659 | gnu_lower_bound, | |
2660 | convert (gnu_string_index_type, gnu_length)); | |
27becfc8 | 2661 | tree gnu_index_type |
211df513 | 2662 | = create_index_type (convert (sizetype, gnu_lower_bound), |
2663 | convert (sizetype, gnu_upper_bound), | |
a9538d68 | 2664 | create_range_type (gnu_string_index_type, |
2665 | gnu_lower_bound, | |
2666 | gnu_upper_bound), | |
211df513 | 2667 | gnat_entity); |
27becfc8 | 2668 | |
2669 | gnu_type | |
2670 | = build_array_type (gnat_to_gnu_type (Component_Type (gnat_entity)), | |
2671 | gnu_index_type); | |
9c843fa0 | 2672 | if (array_type_has_nonaliased_component (gnat_entity, gnu_type)) |
2673 | TYPE_NONALIASED_COMPONENT (gnu_type) = 1; | |
892fdb03 | 2674 | relate_alias_sets (gnu_type, gnu_string_type, ALIAS_SET_COPY); |
27becfc8 | 2675 | } |
2676 | break; | |
2677 | ||
2678 | /* Record Types and Subtypes | |
2679 | ||
2680 | The following fields are defined on record types: | |
2681 | ||
2682 | Has_Discriminants True if the record has discriminants | |
2683 | First_Discriminant Points to head of list of discriminants | |
2684 | First_Entity Points to head of list of fields | |
2685 | Is_Tagged_Type True if the record is tagged | |
2686 | ||
2687 | Implementation of Ada records and discriminated records: | |
2688 | ||
2689 | A record type definition is transformed into the equivalent of a C | |
2690 | struct definition. The fields that are the discriminants which are | |
2691 | found in the Full_Type_Declaration node and the elements of the | |
2692 | Component_List found in the Record_Type_Definition node. The | |
2693 | Component_List can be a recursive structure since each Variant of | |
2694 | the Variant_Part of the Component_List has a Component_List. | |
2695 | ||
2696 | Processing of a record type definition comprises starting the list of | |
2697 | field declarations here from the discriminants and the calling the | |
2698 | function components_to_record to add the rest of the fields from the | |
ea5ec53d | 2699 | component list and return the gnu type node. The function |
27becfc8 | 2700 | components_to_record will call itself recursively as it traverses |
2701 | the tree. */ | |
2702 | ||
2703 | case E_Record_Type: | |
2704 | if (Has_Complex_Representation (gnat_entity)) | |
2705 | { | |
2706 | gnu_type | |
2707 | = build_complex_type | |
2708 | (get_unpadded_type | |
2709 | (Etype (Defining_Entity | |
2710 | (First (Component_Items | |
2711 | (Component_List | |
2712 | (Type_Definition | |
2713 | (Declaration_Node (gnat_entity))))))))); | |
2714 | ||
2715 | break; | |
2716 | } | |
2717 | ||
2718 | { | |
2719 | Node_Id full_definition = Declaration_Node (gnat_entity); | |
2720 | Node_Id record_definition = Type_Definition (full_definition); | |
2721 | Entity_Id gnat_field; | |
2722 | tree gnu_field; | |
2723 | tree gnu_field_list = NULL_TREE; | |
2724 | tree gnu_get_parent; | |
2725 | /* Set PACKED in keeping with gnat_to_gnu_field. */ | |
2726 | int packed | |
2727 | = Is_Packed (gnat_entity) | |
2728 | ? 1 | |
2729 | : Component_Alignment (gnat_entity) == Calign_Storage_Unit | |
2730 | ? -1 | |
2731 | : (Known_Alignment (gnat_entity) | |
2732 | || (Strict_Alignment (gnat_entity) | |
2733 | && Known_Static_Esize (gnat_entity))) | |
2734 | ? -2 | |
2735 | : 0; | |
2736 | bool has_rep = Has_Specified_Layout (gnat_entity); | |
2737 | bool all_rep = has_rep; | |
2738 | bool is_extension | |
2739 | = (Is_Tagged_Type (gnat_entity) | |
2740 | && Nkind (record_definition) == N_Derived_Type_Definition); | |
2741 | ||
2742 | /* See if all fields have a rep clause. Stop when we find one | |
2743 | that doesn't. */ | |
2744 | for (gnat_field = First_Entity (gnat_entity); | |
2745 | Present (gnat_field) && all_rep; | |
2746 | gnat_field = Next_Entity (gnat_field)) | |
2747 | if ((Ekind (gnat_field) == E_Component | |
2748 | || Ekind (gnat_field) == E_Discriminant) | |
2749 | && No (Component_Clause (gnat_field))) | |
2750 | all_rep = false; | |
2751 | ||
2752 | /* If this is a record extension, go a level further to find the | |
2753 | record definition. Also, verify we have a Parent_Subtype. */ | |
2754 | if (is_extension) | |
2755 | { | |
2756 | if (!type_annotate_only | |
2757 | || Present (Record_Extension_Part (record_definition))) | |
2758 | record_definition = Record_Extension_Part (record_definition); | |
2759 | ||
2760 | gcc_assert (type_annotate_only | |
2761 | || Present (Parent_Subtype (gnat_entity))); | |
2762 | } | |
2763 | ||
2764 | /* Make a node for the record. If we are not defining the record, | |
2765 | suppress expanding incomplete types. */ | |
2766 | gnu_type = make_node (tree_code_for_record_type (gnat_entity)); | |
e3698827 | 2767 | TYPE_NAME (gnu_type) = gnu_entity_name; |
27becfc8 | 2768 | TYPE_PACKED (gnu_type) = (packed != 0) || has_rep; |
2769 | ||
2770 | if (!definition) | |
2771 | defer_incomplete_level++, this_deferred = true; | |
2772 | ||
2773 | /* If both a size and rep clause was specified, put the size in | |
2774 | the record type now so that it can get the proper mode. */ | |
2775 | if (has_rep && Known_Esize (gnat_entity)) | |
2776 | TYPE_SIZE (gnu_type) = UI_To_gnu (Esize (gnat_entity), sizetype); | |
2777 | ||
2778 | /* Always set the alignment here so that it can be used to | |
2779 | set the mode, if it is making the alignment stricter. If | |
2780 | it is invalid, it will be checked again below. If this is to | |
2781 | be Atomic, choose a default alignment of a word unless we know | |
2782 | the size and it's smaller. */ | |
2783 | if (Known_Alignment (gnat_entity)) | |
2784 | TYPE_ALIGN (gnu_type) | |
2785 | = validate_alignment (Alignment (gnat_entity), gnat_entity, 0); | |
2786 | else if (Is_Atomic (gnat_entity)) | |
2787 | TYPE_ALIGN (gnu_type) | |
2788 | = esize >= BITS_PER_WORD ? BITS_PER_WORD : ceil_alignment (esize); | |
2789 | /* If a type needs strict alignment, the minimum size will be the | |
2790 | type size instead of the RM size (see validate_size). Cap the | |
2791 | alignment, lest it causes this type size to become too large. */ | |
2792 | else if (Strict_Alignment (gnat_entity) | |
2793 | && Known_Static_Esize (gnat_entity)) | |
2794 | { | |
2795 | unsigned int raw_size = UI_To_Int (Esize (gnat_entity)); | |
2796 | unsigned int raw_align = raw_size & -raw_size; | |
2797 | if (raw_align < BIGGEST_ALIGNMENT) | |
2798 | TYPE_ALIGN (gnu_type) = raw_align; | |
2799 | } | |
2800 | else | |
2801 | TYPE_ALIGN (gnu_type) = 0; | |
2802 | ||
2803 | /* If we have a Parent_Subtype, make a field for the parent. If | |
2804 | this record has rep clauses, force the position to zero. */ | |
2805 | if (Present (Parent_Subtype (gnat_entity))) | |
2806 | { | |
2807 | Entity_Id gnat_parent = Parent_Subtype (gnat_entity); | |
2808 | tree gnu_parent; | |
2809 | ||
2810 | /* A major complexity here is that the parent subtype will | |
2811 | reference our discriminants in its Discriminant_Constraint | |
2812 | list. But those must reference the parent component of this | |
2813 | record which is of the parent subtype we have not built yet! | |
2814 | To break the circle we first build a dummy COMPONENT_REF which | |
2815 | represents the "get to the parent" operation and initialize | |
2816 | each of those discriminants to a COMPONENT_REF of the above | |
2817 | dummy parent referencing the corresponding discriminant of the | |
2818 | base type of the parent subtype. */ | |
2819 | gnu_get_parent = build3 (COMPONENT_REF, void_type_node, | |
2820 | build0 (PLACEHOLDER_EXPR, gnu_type), | |
2821 | build_decl (FIELD_DECL, NULL_TREE, | |
2822 | void_type_node), | |
2823 | NULL_TREE); | |
2824 | ||
2825 | if (Has_Discriminants (gnat_entity)) | |
2826 | for (gnat_field = First_Stored_Discriminant (gnat_entity); | |
2827 | Present (gnat_field); | |
2828 | gnat_field = Next_Stored_Discriminant (gnat_field)) | |
2829 | if (Present (Corresponding_Discriminant (gnat_field))) | |
2830 | save_gnu_tree | |
2831 | (gnat_field, | |
2832 | build3 (COMPONENT_REF, | |
2833 | get_unpadded_type (Etype (gnat_field)), | |
2834 | gnu_get_parent, | |
2835 | gnat_to_gnu_field_decl (Corresponding_Discriminant | |
2836 | (gnat_field)), | |
2837 | NULL_TREE), | |
2838 | true); | |
2839 | ||
8382e2a2 | 2840 | /* Then we build the parent subtype. If it has discriminants but |
2841 | the type itself has unknown discriminants, this means that it | |
2842 | doesn't contain information about how the discriminants are | |
2843 | derived from those of the ancestor type, so it cannot be used | |
2844 | directly. Instead it is built by cloning the parent subtype | |
2845 | of the underlying record view of the type, for which the above | |
2846 | derivation of discriminants has been made explicit. */ | |
2847 | if (Has_Discriminants (gnat_parent) | |
2848 | && Has_Unknown_Discriminants (gnat_entity)) | |
2849 | { | |
2850 | Entity_Id gnat_uview = Underlying_Record_View (gnat_entity); | |
2851 | ||
2852 | /* If we are defining the type, the underlying record | |
2853 | view must already have been elaborated at this point. | |
2854 | Otherwise do it now as its parent subtype cannot be | |
2855 | technically elaborated on its own. */ | |
2856 | if (definition) | |
2857 | gcc_assert (present_gnu_tree (gnat_uview)); | |
2858 | else | |
2859 | gnat_to_gnu_entity (gnat_uview, NULL_TREE, 0); | |
2860 | ||
2861 | gnu_parent = gnat_to_gnu_type (Parent_Subtype (gnat_uview)); | |
2862 | ||
2863 | /* Substitute the "get to the parent" of the type for that | |
2864 | of its underlying record view in the cloned type. */ | |
2865 | for (gnat_field = First_Stored_Discriminant (gnat_uview); | |
2866 | Present (gnat_field); | |
2867 | gnat_field = Next_Stored_Discriminant (gnat_field)) | |
2868 | if (Present (Corresponding_Discriminant (gnat_field))) | |
2869 | { | |
2870 | tree gnu_field = gnat_to_gnu_field_decl (gnat_field); | |
2871 | tree gnu_ref | |
2872 | = build3 (COMPONENT_REF, TREE_TYPE (gnu_field), | |
2873 | gnu_get_parent, gnu_field, NULL_TREE); | |
2874 | gnu_parent | |
2875 | = substitute_in_type (gnu_parent, gnu_field, gnu_ref); | |
2876 | } | |
2877 | } | |
2878 | else | |
2879 | gnu_parent = gnat_to_gnu_type (gnat_parent); | |
27becfc8 | 2880 | |
2881 | /* Finally we fix up both kinds of twisted COMPONENT_REF we have | |
2882 | initially built. The discriminants must reference the fields | |
2883 | of the parent subtype and not those of its base type for the | |
2884 | placeholder machinery to properly work. */ | |
2885 | if (Has_Discriminants (gnat_entity)) | |
2886 | for (gnat_field = First_Stored_Discriminant (gnat_entity); | |
2887 | Present (gnat_field); | |
2888 | gnat_field = Next_Stored_Discriminant (gnat_field)) | |
2889 | if (Present (Corresponding_Discriminant (gnat_field))) | |
2890 | { | |
2891 | Entity_Id field = Empty; | |
2892 | for (field = First_Stored_Discriminant (gnat_parent); | |
2893 | Present (field); | |
2894 | field = Next_Stored_Discriminant (field)) | |
2895 | if (same_discriminant_p (gnat_field, field)) | |
2896 | break; | |
2897 | gcc_assert (Present (field)); | |
2898 | TREE_OPERAND (get_gnu_tree (gnat_field), 1) | |
2899 | = gnat_to_gnu_field_decl (field); | |
2900 | } | |
2901 | ||
2902 | /* The "get to the parent" COMPONENT_REF must be given its | |
2903 | proper type... */ | |
2904 | TREE_TYPE (gnu_get_parent) = gnu_parent; | |
2905 | ||
2906 | /* ...and reference the _parent field of this record. */ | |
2907 | gnu_field_list | |
2908 | = create_field_decl (get_identifier | |
2909 | (Get_Name_String (Name_uParent)), | |
2910 | gnu_parent, gnu_type, 0, | |
2911 | has_rep ? TYPE_SIZE (gnu_parent) : 0, | |
2912 | has_rep ? bitsize_zero_node : 0, 1); | |
2913 | DECL_INTERNAL_P (gnu_field_list) = 1; | |
2914 | TREE_OPERAND (gnu_get_parent, 1) = gnu_field_list; | |
2915 | } | |
2916 | ||
2917 | /* Make the fields for the discriminants and put them into the record | |
2918 | unless it's an Unchecked_Union. */ | |
2919 | if (Has_Discriminants (gnat_entity)) | |
2920 | for (gnat_field = First_Stored_Discriminant (gnat_entity); | |
2921 | Present (gnat_field); | |
2922 | gnat_field = Next_Stored_Discriminant (gnat_field)) | |
2923 | { | |
2924 | /* If this is a record extension and this discriminant | |
2925 | is the renaming of another discriminant, we've already | |
2926 | handled the discriminant above. */ | |
2927 | if (Present (Parent_Subtype (gnat_entity)) | |
2928 | && Present (Corresponding_Discriminant (gnat_field))) | |
2929 | continue; | |
2930 | ||
2931 | gnu_field | |
2932 | = gnat_to_gnu_field (gnat_field, gnu_type, packed, definition); | |
2933 | ||
2934 | /* Make an expression using a PLACEHOLDER_EXPR from the | |
2935 | FIELD_DECL node just created and link that with the | |
2936 | corresponding GNAT defining identifier. Then add to the | |
2937 | list of fields. */ | |
2938 | save_gnu_tree (gnat_field, | |
2939 | build3 (COMPONENT_REF, TREE_TYPE (gnu_field), | |
2940 | build0 (PLACEHOLDER_EXPR, | |
2941 | DECL_CONTEXT (gnu_field)), | |
2942 | gnu_field, NULL_TREE), | |
2943 | true); | |
2944 | ||
2945 | if (!Is_Unchecked_Union (gnat_entity)) | |
2946 | { | |
2947 | TREE_CHAIN (gnu_field) = gnu_field_list; | |
2948 | gnu_field_list = gnu_field; | |
2949 | } | |
2950 | } | |
2951 | ||
2952 | /* Put the discriminants into the record (backwards), so we can | |
2953 | know the appropriate discriminant to use for the names of the | |
2954 | variants. */ | |
2955 | TYPE_FIELDS (gnu_type) = gnu_field_list; | |
2956 | ||
2957 | /* Add the listed fields into the record and finish it up. */ | |
2958 | components_to_record (gnu_type, Component_List (record_definition), | |
2959 | gnu_field_list, packed, definition, NULL, | |
2960 | false, all_rep, false, | |
2961 | Is_Unchecked_Union (gnat_entity)); | |
2962 | ||
2963 | /* We used to remove the associations of the discriminants and | |
2964 | _Parent for validity checking, but we may need them if there's | |
2965 | Freeze_Node for a subtype used in this record. */ | |
2966 | TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity); | |
2967 | TYPE_BY_REFERENCE_P (gnu_type) = Is_By_Reference_Type (gnat_entity); | |
2968 | ||
2969 | /* If it is a tagged record force the type to BLKmode to insure | |
ea5ec53d | 2970 | that these objects will always be placed in memory. Do the |
2971 | same thing for limited record types. */ | |
27becfc8 | 2972 | if (Is_Tagged_Type (gnat_entity) || Is_Limited_Record (gnat_entity)) |
3a2a1581 | 2973 | SET_TYPE_MODE (gnu_type, BLKmode); |
27becfc8 | 2974 | |
27becfc8 | 2975 | /* Fill in locations of fields. */ |
2976 | annotate_rep (gnat_entity, gnu_type); | |
2977 | ||
2978 | /* If there are any entities in the chain corresponding to | |
2979 | components that we did not elaborate, ensure we elaborate their | |
2980 | types if they are Itypes. */ | |
2981 | for (gnat_temp = First_Entity (gnat_entity); | |
2982 | Present (gnat_temp); gnat_temp = Next_Entity (gnat_temp)) | |
2983 | if ((Ekind (gnat_temp) == E_Component | |
2984 | || Ekind (gnat_temp) == E_Discriminant) | |
2985 | && Is_Itype (Etype (gnat_temp)) | |
2986 | && !present_gnu_tree (gnat_temp)) | |
2987 | gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0); | |
2988 | } | |
2989 | break; | |
2990 | ||
2991 | case E_Class_Wide_Subtype: | |
2992 | /* If an equivalent type is present, that is what we should use. | |
2993 | Otherwise, fall through to handle this like a record subtype | |
2994 | since it may have constraints. */ | |
2995 | if (gnat_equiv_type != gnat_entity) | |
2996 | { | |
2997 | gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0); | |
2998 | maybe_present = true; | |
2999 | break; | |
3000 | } | |
3001 | ||
3002 | /* ... fall through ... */ | |
3003 | ||
3004 | case E_Record_Subtype: | |
3005 | ||
3006 | /* If Cloned_Subtype is Present it means this record subtype has | |
3007 | identical layout to that type or subtype and we should use | |
3008 | that GCC type for this one. The front end guarantees that | |
3009 | the component list is shared. */ | |
3010 | if (Present (Cloned_Subtype (gnat_entity))) | |
3011 | { | |
3012 | gnu_decl = gnat_to_gnu_entity (Cloned_Subtype (gnat_entity), | |
3013 | NULL_TREE, 0); | |
3014 | maybe_present = true; | |
3015 | } | |
3016 | ||
3017 | /* Otherwise, first ensure the base type is elaborated. Then, if we are | |
3018 | changing the type, make a new type with each field having the | |
3019 | type of the field in the new subtype but having the position | |
3020 | computed by transforming every discriminant reference according | |
3021 | to the constraints. We don't see any difference between | |
3022 | private and nonprivate type here since derivations from types should | |
3023 | have been deferred until the completion of the private type. */ | |
3024 | else | |
3025 | { | |
3026 | Entity_Id gnat_base_type = Implementation_Base_Type (gnat_entity); | |
3027 | tree gnu_base_type; | |
3028 | tree gnu_orig_type; | |
3029 | ||
3030 | if (!definition) | |
3031 | defer_incomplete_level++, this_deferred = true; | |
3032 | ||
3033 | /* Get the base type initially for its alignment and sizes. But | |
3034 | if it is a padded type, we do all the other work with the | |
3035 | unpadded type. */ | |
3036 | gnu_base_type = gnat_to_gnu_type (gnat_base_type); | |
3037 | ||
3038 | if (TREE_CODE (gnu_base_type) == RECORD_TYPE | |
3039 | && TYPE_IS_PADDING_P (gnu_base_type)) | |
3040 | gnu_type = gnu_orig_type = TREE_TYPE (TYPE_FIELDS (gnu_base_type)); | |
3041 | else | |
3042 | gnu_type = gnu_orig_type = gnu_base_type; | |
3043 | ||
3044 | if (present_gnu_tree (gnat_entity)) | |
3045 | { | |
3046 | maybe_present = true; | |
3047 | break; | |
3048 | } | |
3049 | ||
3050 | /* When the type has discriminants, and these discriminants | |
3051 | affect the shape of what it built, factor them in. | |
3052 | ||
3053 | If we are making a subtype of an Unchecked_Union (must be an | |
3054 | Itype), just return the type. | |
3055 | ||
3056 | We can't just use Is_Constrained because private subtypes without | |
3057 | discriminants of full types with discriminants with default | |
3058 | expressions are Is_Constrained but aren't constrained! */ | |
3059 | ||
3060 | if (IN (Ekind (gnat_base_type), Record_Kind) | |
3061 | && !Is_For_Access_Subtype (gnat_entity) | |
3062 | && !Is_Unchecked_Union (gnat_base_type) | |
3063 | && Is_Constrained (gnat_entity) | |
3064 | && Stored_Constraint (gnat_entity) != No_Elist | |
3065 | && Present (Discriminant_Constraint (gnat_entity))) | |
3066 | { | |
3067 | Entity_Id gnat_field; | |
3068 | tree gnu_field_list = 0; | |
3069 | tree gnu_pos_list | |
3070 | = compute_field_positions (gnu_orig_type, NULL_TREE, | |
3071 | size_zero_node, bitsize_zero_node, | |
3072 | BIGGEST_ALIGNMENT); | |
3073 | tree gnu_subst_list | |
3074 | = substitution_list (gnat_entity, gnat_base_type, NULL_TREE, | |
3075 | definition); | |
3076 | tree gnu_temp; | |
3077 | ||
3078 | gnu_type = make_node (RECORD_TYPE); | |
e3698827 | 3079 | TYPE_NAME (gnu_type) = gnu_entity_name; |
27becfc8 | 3080 | TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity); |
3081 | ||
3082 | /* Set the size, alignment and alias set of the new type to | |
3083 | match that of the old one, doing required substitutions. | |
3084 | We do it this early because we need the size of the new | |
3085 | type below to discard old fields if necessary. */ | |
3086 | TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_base_type); | |
3087 | TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_base_type); | |
3088 | SET_TYPE_ADA_SIZE (gnu_type, TYPE_ADA_SIZE (gnu_base_type)); | |
3089 | TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_base_type); | |
892fdb03 | 3090 | relate_alias_sets (gnu_type, gnu_base_type, ALIAS_SET_COPY); |
27becfc8 | 3091 | |
3092 | if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))) | |
3093 | for (gnu_temp = gnu_subst_list; | |
3094 | gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp)) | |
3095 | TYPE_SIZE (gnu_type) | |
3096 | = substitute_in_expr (TYPE_SIZE (gnu_type), | |
3097 | TREE_PURPOSE (gnu_temp), | |
3098 | TREE_VALUE (gnu_temp)); | |
3099 | ||
3100 | if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (gnu_type))) | |
3101 | for (gnu_temp = gnu_subst_list; | |
3102 | gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp)) | |
3103 | TYPE_SIZE_UNIT (gnu_type) | |
3104 | = substitute_in_expr (TYPE_SIZE_UNIT (gnu_type), | |
3105 | TREE_PURPOSE (gnu_temp), | |
3106 | TREE_VALUE (gnu_temp)); | |
3107 | ||
3108 | if (CONTAINS_PLACEHOLDER_P (TYPE_ADA_SIZE (gnu_type))) | |
3109 | for (gnu_temp = gnu_subst_list; | |
3110 | gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp)) | |
3111 | SET_TYPE_ADA_SIZE | |
3112 | (gnu_type, substitute_in_expr (TYPE_ADA_SIZE (gnu_type), | |
3113 | TREE_PURPOSE (gnu_temp), | |
3114 | TREE_VALUE (gnu_temp))); | |
3115 | ||
3116 | for (gnat_field = First_Entity (gnat_entity); | |
3117 | Present (gnat_field); gnat_field = Next_Entity (gnat_field)) | |
3118 | if ((Ekind (gnat_field) == E_Component | |
3119 | || Ekind (gnat_field) == E_Discriminant) | |
3120 | && (Underlying_Type (Scope (Original_Record_Component | |
3121 | (gnat_field))) | |
3122 | == gnat_base_type) | |
3123 | && (No (Corresponding_Discriminant (gnat_field)) | |
3124 | || !Is_Tagged_Type (gnat_base_type))) | |
3125 | { | |
3126 | tree gnu_old_field | |
3127 | = gnat_to_gnu_field_decl (Original_Record_Component | |
3128 | (gnat_field)); | |
3129 | tree gnu_offset | |
3130 | = TREE_VALUE (purpose_member (gnu_old_field, | |
3131 | gnu_pos_list)); | |
3132 | tree gnu_pos = TREE_PURPOSE (gnu_offset); | |
3133 | tree gnu_bitpos = TREE_VALUE (TREE_VALUE (gnu_offset)); | |
3134 | tree gnu_field_type | |
3135 | = gnat_to_gnu_type (Etype (gnat_field)); | |
3136 | tree gnu_size = TYPE_SIZE (gnu_field_type); | |
3137 | tree gnu_new_pos = NULL_TREE; | |
3138 | unsigned int offset_align | |
3139 | = tree_low_cst (TREE_PURPOSE (TREE_VALUE (gnu_offset)), | |
3140 | 1); | |
3141 | tree gnu_field; | |
3142 | ||
3143 | /* If there was a component clause, the field types must be | |
3144 | the same for the type and subtype, so copy the data from | |
3145 | the old field to avoid recomputation here. Also if the | |
3146 | field is justified modular and the optimization in | |
3147 | gnat_to_gnu_field was applied. */ | |
3148 | if (Present (Component_Clause | |
3149 | (Original_Record_Component (gnat_field))) | |
3150 | || (TREE_CODE (gnu_field_type) == RECORD_TYPE | |
3151 | && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type) | |
3152 | && TREE_TYPE (TYPE_FIELDS (gnu_field_type)) | |
3153 | == TREE_TYPE (gnu_old_field))) | |
3154 | { | |
3155 | gnu_size = DECL_SIZE (gnu_old_field); | |
3156 | gnu_field_type = TREE_TYPE (gnu_old_field); | |
3157 | } | |
3158 | ||
3159 | /* If the old field was packed and of constant size, we | |
3160 | have to get the old size here, as it might differ from | |
3161 | what the Etype conveys and the latter might overlap | |
3162 | onto the following field. Try to arrange the type for | |
3163 | possible better packing along the way. */ | |
3164 | else if (DECL_PACKED (gnu_old_field) | |
3165 | && TREE_CODE (DECL_SIZE (gnu_old_field)) | |
3166 | == INTEGER_CST) | |
3167 | { | |
3168 | gnu_size = DECL_SIZE (gnu_old_field); | |
f6b2b596 | 3169 | if (TREE_CODE (gnu_field_type) == RECORD_TYPE |
3170 | && !TYPE_IS_FAT_POINTER_P (gnu_field_type) | |
27becfc8 | 3171 | && host_integerp (TYPE_SIZE (gnu_field_type), 1)) |
3172 | gnu_field_type | |
3173 | = make_packable_type (gnu_field_type, true); | |
3174 | } | |
3175 | ||
3176 | if (CONTAINS_PLACEHOLDER_P (gnu_pos)) | |
3177 | for (gnu_temp = gnu_subst_list; | |
3178 | gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp)) | |
3179 | gnu_pos = substitute_in_expr (gnu_pos, | |
3180 | TREE_PURPOSE (gnu_temp), | |
3181 | TREE_VALUE (gnu_temp)); | |
3182 | ||
3183 | /* If the position is now a constant, we can set it as the | |
3184 | position of the field when we make it. Otherwise, we need | |
3185 | to deal with it specially below. */ | |
3186 | if (TREE_CONSTANT (gnu_pos)) | |
3187 | { | |
3188 | gnu_new_pos = bit_from_pos (gnu_pos, gnu_bitpos); | |
3189 | ||
3190 | /* Discard old fields that are outside the new type. | |
3191 | This avoids confusing code scanning it to decide | |
5757acea | 3192 | how to pass it to functions on some platforms. */ |
27becfc8 | 3193 | if (TREE_CODE (gnu_new_pos) == INTEGER_CST |
3194 | && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST | |
3195 | && !integer_zerop (gnu_size) | |
3196 | && !tree_int_cst_lt (gnu_new_pos, | |
3197 | TYPE_SIZE (gnu_type))) | |
3198 | continue; | |
3199 | } | |
3200 | ||
3201 | gnu_field | |
3202 | = create_field_decl | |
3203 | (DECL_NAME (gnu_old_field), gnu_field_type, gnu_type, | |
3204 | DECL_PACKED (gnu_old_field), gnu_size, gnu_new_pos, | |
3205 | !DECL_NONADDRESSABLE_P (gnu_old_field)); | |
3206 | ||
3207 | if (!TREE_CONSTANT (gnu_pos)) | |
3208 | { | |
3209 | normalize_offset (&gnu_pos, &gnu_bitpos, offset_align); | |
3210 | DECL_FIELD_OFFSET (gnu_field) = gnu_pos; | |
3211 | DECL_FIELD_BIT_OFFSET (gnu_field) = gnu_bitpos; | |
3212 | SET_DECL_OFFSET_ALIGN (gnu_field, offset_align); | |
3213 | DECL_SIZE (gnu_field) = gnu_size; | |
3214 | DECL_SIZE_UNIT (gnu_field) | |
3215 | = convert (sizetype, | |
3216 | size_binop (CEIL_DIV_EXPR, gnu_size, | |
3217 | bitsize_unit_node)); | |
3218 | layout_decl (gnu_field, DECL_OFFSET_ALIGN (gnu_field)); | |
3219 | } | |
3220 | ||
3221 | DECL_INTERNAL_P (gnu_field) | |
3222 | = DECL_INTERNAL_P (gnu_old_field); | |
3223 | SET_DECL_ORIGINAL_FIELD | |
3224 | (gnu_field, (DECL_ORIGINAL_FIELD (gnu_old_field) | |
3225 | ? DECL_ORIGINAL_FIELD (gnu_old_field) | |
3226 | : gnu_old_field)); | |
3227 | DECL_DISCRIMINANT_NUMBER (gnu_field) | |
3228 | = DECL_DISCRIMINANT_NUMBER (gnu_old_field); | |
3229 | TREE_THIS_VOLATILE (gnu_field) | |
3230 | = TREE_THIS_VOLATILE (gnu_old_field); | |
c4f4d389 | 3231 | |
3232 | /* To match the layout crafted in components_to_record, if | |
3233 | this is the _Tag field, put it before any discriminants | |
3234 | instead of after them as for all other fields. */ | |
3235 | if (Chars (gnat_field) == Name_uTag) | |
3236 | gnu_field_list = chainon (gnu_field_list, gnu_field); | |
3237 | else | |
3238 | { | |
3239 | TREE_CHAIN (gnu_field) = gnu_field_list; | |
3240 | gnu_field_list = gnu_field; | |
3241 | } | |
3242 | ||
27becfc8 | 3243 | save_gnu_tree (gnat_field, gnu_field, false); |
3244 | } | |
3245 | ||
3246 | /* Now go through the entities again looking for Itypes that | |
3247 | we have not elaborated but should (e.g., Etypes of fields | |
3248 | that have Original_Components). */ | |
3249 | for (gnat_field = First_Entity (gnat_entity); | |
3250 | Present (gnat_field); gnat_field = Next_Entity (gnat_field)) | |
3251 | if ((Ekind (gnat_field) == E_Discriminant | |
3252 | || Ekind (gnat_field) == E_Component) | |
3253 | && !present_gnu_tree (Etype (gnat_field))) | |
3254 | gnat_to_gnu_entity (Etype (gnat_field), NULL_TREE, 0); | |
3255 | ||
3256 | /* Do not finalize it since we're going to modify it below. */ | |
3257 | gnu_field_list = nreverse (gnu_field_list); | |
3258 | finish_record_type (gnu_type, gnu_field_list, 2, true); | |
3259 | ||
3260 | /* Finalize size and mode. */ | |
3261 | TYPE_SIZE (gnu_type) = variable_size (TYPE_SIZE (gnu_type)); | |
3262 | TYPE_SIZE_UNIT (gnu_type) | |
3263 | = variable_size (TYPE_SIZE_UNIT (gnu_type)); | |
3264 | ||
3265 | compute_record_mode (gnu_type); | |
3266 | ||
3267 | /* Fill in locations of fields. */ | |
3268 | annotate_rep (gnat_entity, gnu_type); | |
3269 | ||
3270 | /* We've built a new type, make an XVS type to show what this | |
3271 | is a subtype of. Some debuggers require the XVS type to be | |
3272 | output first, so do it in that order. */ | |
3273 | if (debug_info_p) | |
3274 | { | |
3275 | tree gnu_subtype_marker = make_node (RECORD_TYPE); | |
3276 | tree gnu_orig_name = TYPE_NAME (gnu_orig_type); | |
3277 | ||
3278 | if (TREE_CODE (gnu_orig_name) == TYPE_DECL) | |
3279 | gnu_orig_name = DECL_NAME (gnu_orig_name); | |
3280 | ||
3281 | TYPE_NAME (gnu_subtype_marker) | |
3282 | = create_concat_name (gnat_entity, "XVS"); | |
3283 | finish_record_type (gnu_subtype_marker, | |
3284 | create_field_decl (gnu_orig_name, | |
3285 | integer_type_node, | |
3286 | gnu_subtype_marker, | |
3287 | 0, NULL_TREE, | |
3288 | NULL_TREE, 0), | |
3289 | 0, false); | |
3290 | ||
3291 | add_parallel_type (TYPE_STUB_DECL (gnu_type), | |
3292 | gnu_subtype_marker); | |
3293 | } | |
3294 | ||
3295 | /* Now we can finalize it. */ | |
3296 | rest_of_record_type_compilation (gnu_type); | |
3297 | } | |
3298 | ||
3299 | /* Otherwise, go down all the components in the new type and | |
3300 | make them equivalent to those in the base type. */ | |
3301 | else | |
3302 | for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp); | |
3303 | gnat_temp = Next_Entity (gnat_temp)) | |
3304 | if ((Ekind (gnat_temp) == E_Discriminant | |
3305 | && !Is_Unchecked_Union (gnat_base_type)) | |
3306 | || Ekind (gnat_temp) == E_Component) | |
3307 | save_gnu_tree (gnat_temp, | |
3308 | gnat_to_gnu_field_decl | |
3309 | (Original_Record_Component (gnat_temp)), false); | |
3310 | } | |
3311 | break; | |
3312 | ||
3313 | case E_Access_Subprogram_Type: | |
3314 | /* Use the special descriptor type for dispatch tables if needed, | |
3315 | that is to say for the Prim_Ptr of a-tags.ads and its clones. | |
3316 | Note that we are only required to do so for static tables in | |
3317 | order to be compatible with the C++ ABI, but Ada 2005 allows | |
3318 | to extend library level tagged types at the local level so | |
3319 | we do it in the non-static case as well. */ | |
3320 | if (TARGET_VTABLE_USES_DESCRIPTORS | |
3321 | && Is_Dispatch_Table_Entity (gnat_entity)) | |
3322 | { | |
3323 | gnu_type = fdesc_type_node; | |
3324 | gnu_size = TYPE_SIZE (gnu_type); | |
3325 | break; | |
3326 | } | |
3327 | ||
3328 | /* ... fall through ... */ | |
3329 | ||
3330 | case E_Anonymous_Access_Subprogram_Type: | |
3331 | /* If we are not defining this entity, and we have incomplete | |
3332 | entities being processed above us, make a dummy type and | |
3333 | fill it in later. */ | |
3334 | if (!definition && defer_incomplete_level != 0) | |
3335 | { | |
3336 | struct incomplete *p | |
3337 | = (struct incomplete *) xmalloc (sizeof (struct incomplete)); | |
3338 | ||
3339 | gnu_type | |
3340 | = build_pointer_type | |
3341 | (make_dummy_type (Directly_Designated_Type (gnat_entity))); | |
e3698827 | 3342 | gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list, |
27becfc8 | 3343 | !Comes_From_Source (gnat_entity), |
3344 | debug_info_p, gnat_entity); | |
3345 | this_made_decl = true; | |
3346 | gnu_type = TREE_TYPE (gnu_decl); | |
3347 | save_gnu_tree (gnat_entity, gnu_decl, false); | |
3348 | saved = true; | |
3349 | ||
3350 | p->old_type = TREE_TYPE (gnu_type); | |
3351 | p->full_type = Directly_Designated_Type (gnat_entity); | |
3352 | p->next = defer_incomplete_list; | |
3353 | defer_incomplete_list = p; | |
3354 | break; | |
3355 | } | |
3356 | ||
3357 | /* ... fall through ... */ | |
3358 | ||
3359 | case E_Allocator_Type: | |
3360 | case E_Access_Type: | |
3361 | case E_Access_Attribute_Type: | |
3362 | case E_Anonymous_Access_Type: | |
3363 | case E_General_Access_Type: | |
3364 | { | |
3365 | Entity_Id gnat_desig_type = Directly_Designated_Type (gnat_entity); | |
3366 | Entity_Id gnat_desig_equiv = Gigi_Equivalent_Type (gnat_desig_type); | |
3367 | bool is_from_limited_with | |
3368 | = (IN (Ekind (gnat_desig_equiv), Incomplete_Kind) | |
3369 | && From_With_Type (gnat_desig_equiv)); | |
3370 | ||
3371 | /* Get the "full view" of this entity. If this is an incomplete | |
3372 | entity from a limited with, treat its non-limited view as the full | |
3373 | view. Otherwise, if this is an incomplete or private type, use the | |
3374 | full view. In the former case, we might point to a private type, | |
3375 | in which case, we need its full view. Also, we want to look at the | |
3376 | actual type used for the representation, so this takes a total of | |
3377 | three steps. */ | |
3378 | Entity_Id gnat_desig_full_direct_first | |
3379 | = (is_from_limited_with ? Non_Limited_View (gnat_desig_equiv) | |
3380 | : (IN (Ekind (gnat_desig_equiv), Incomplete_Or_Private_Kind) | |
3381 | ? Full_View (gnat_desig_equiv) : Empty)); | |
3382 | Entity_Id gnat_desig_full_direct | |
3383 | = ((is_from_limited_with | |
3384 | && Present (gnat_desig_full_direct_first) | |
3385 | && IN (Ekind (gnat_desig_full_direct_first), Private_Kind)) | |
3386 | ? Full_View (gnat_desig_full_direct_first) | |
3387 | : gnat_desig_full_direct_first); | |
3388 | Entity_Id gnat_desig_full | |
3389 | = Gigi_Equivalent_Type (gnat_desig_full_direct); | |
3390 | ||
3391 | /* This the type actually used to represent the designated type, | |
3392 | either gnat_desig_full or gnat_desig_equiv. */ | |
3393 | Entity_Id gnat_desig_rep; | |
3394 | ||
32826d65 | 3395 | /* True if this is a pointer to an unconstrained array. */ |
27becfc8 | 3396 | bool is_unconstrained_array; |
3397 | ||
3398 | /* We want to know if we'll be seeing the freeze node for any | |
3399 | incomplete type we may be pointing to. */ | |
3400 | bool in_main_unit | |
3401 | = (Present (gnat_desig_full) | |
3402 | ? In_Extended_Main_Code_Unit (gnat_desig_full) | |
3403 | : In_Extended_Main_Code_Unit (gnat_desig_type)); | |
3404 | ||
32826d65 | 3405 | /* True if we make a dummy type here. */ |
27becfc8 | 3406 | bool got_fat_p = false; |
32826d65 | 3407 | /* True if the dummy is a fat pointer. */ |
27becfc8 | 3408 | bool made_dummy = false; |
3409 | tree gnu_desig_type = NULL_TREE; | |
3410 | enum machine_mode p_mode = mode_for_size (esize, MODE_INT, 0); | |
3411 | ||
3412 | if (!targetm.valid_pointer_mode (p_mode)) | |
3413 | p_mode = ptr_mode; | |
3414 | ||
3415 | /* If either the designated type or its full view is an unconstrained | |
3416 | array subtype, replace it with the type it's a subtype of. This | |
3417 | avoids problems with multiple copies of unconstrained array types. | |
3418 | Likewise, if the designated type is a subtype of an incomplete | |
3419 | record type, use the parent type to avoid order of elaboration | |
3420 | issues. This can lose some code efficiency, but there is no | |
3421 | alternative. */ | |
3422 | if (Ekind (gnat_desig_equiv) == E_Array_Subtype | |
3423 | && ! Is_Constrained (gnat_desig_equiv)) | |
3424 | gnat_desig_equiv = Etype (gnat_desig_equiv); | |
3425 | if (Present (gnat_desig_full) | |
3426 | && ((Ekind (gnat_desig_full) == E_Array_Subtype | |
3427 | && ! Is_Constrained (gnat_desig_full)) | |
3428 | || (Ekind (gnat_desig_full) == E_Record_Subtype | |
3429 | && Ekind (Etype (gnat_desig_full)) == E_Record_Type))) | |
3430 | gnat_desig_full = Etype (gnat_desig_full); | |
3431 | ||
3432 | /* Now set the type that actually marks the representation of | |
3433 | the designated type and also flag whether we have a unconstrained | |
3434 | array. */ | |
3435 | gnat_desig_rep = gnat_desig_full ? gnat_desig_full : gnat_desig_equiv; | |
3436 | is_unconstrained_array | |
3437 | = (Is_Array_Type (gnat_desig_rep) | |
3438 | && ! Is_Constrained (gnat_desig_rep)); | |
3439 | ||
3440 | /* If we are pointing to an incomplete type whose completion is an | |
3441 | unconstrained array, make a fat pointer type. The two types in our | |
3442 | fields will be pointers to dummy nodes and will be replaced in | |
3443 | update_pointer_to. Similarly, if the type itself is a dummy type or | |
3444 | an unconstrained array. Also make a dummy TYPE_OBJECT_RECORD_TYPE | |
3445 | in case we have any thin pointers to it. */ | |
3446 | if (is_unconstrained_array | |
3447 | && (Present (gnat_desig_full) | |
3448 | || (present_gnu_tree (gnat_desig_equiv) | |
3449 | && TYPE_IS_DUMMY_P (TREE_TYPE | |
3450 | (get_gnu_tree (gnat_desig_equiv)))) | |
3451 | || (No (gnat_desig_full) && ! in_main_unit | |
3452 | && defer_incomplete_level != 0 | |
3453 | && ! present_gnu_tree (gnat_desig_equiv)) | |
3454 | || (in_main_unit && is_from_limited_with | |
3455 | && Present (Freeze_Node (gnat_desig_rep))))) | |
a002cb99 | 3456 | { |
3457 | tree gnu_old; | |
27becfc8 | 3458 | |
a002cb99 | 3459 | if (present_gnu_tree (gnat_desig_rep)) |
3460 | gnu_old = TREE_TYPE (get_gnu_tree (gnat_desig_rep)); | |
3461 | else | |
3462 | { | |
3463 | gnu_old = make_dummy_type (gnat_desig_rep); | |
3464 | ||
3465 | /* Show the dummy we get will be a fat pointer. */ | |
3466 | got_fat_p = made_dummy = true; | |
3467 | } | |
27becfc8 | 3468 | |
3469 | /* If the call above got something that has a pointer, that | |
3470 | pointer is our type. This could have happened either | |
3471 | because the type was elaborated or because somebody | |
3472 | else executed the code below. */ | |
3473 | gnu_type = TYPE_POINTER_TO (gnu_old); | |
3474 | if (!gnu_type) | |
3475 | { | |
3476 | tree gnu_template_type = make_node (ENUMERAL_TYPE); | |
3477 | tree gnu_ptr_template = build_pointer_type (gnu_template_type); | |
3478 | tree gnu_array_type = make_node (ENUMERAL_TYPE); | |
3479 | tree gnu_ptr_array = build_pointer_type (gnu_array_type); | |
a002cb99 | 3480 | tree fields; |
27becfc8 | 3481 | |
3482 | TYPE_NAME (gnu_template_type) | |
e3698827 | 3483 | = create_concat_name (gnat_desig_equiv, "XUB"); |
27becfc8 | 3484 | TYPE_DUMMY_P (gnu_template_type) = 1; |
3485 | ||
3486 | TYPE_NAME (gnu_array_type) | |
e3698827 | 3487 | = create_concat_name (gnat_desig_equiv, "XUA"); |
27becfc8 | 3488 | TYPE_DUMMY_P (gnu_array_type) = 1; |
3489 | ||
3490 | gnu_type = make_node (RECORD_TYPE); | |
3491 | SET_TYPE_UNCONSTRAINED_ARRAY (gnu_type, gnu_old); | |
3492 | TYPE_POINTER_TO (gnu_old) = gnu_type; | |
3493 | ||
3494 | Sloc_to_locus (Sloc (gnat_entity), &input_location); | |
3495 | fields | |
3496 | = chainon (chainon (NULL_TREE, | |
3497 | create_field_decl | |
3498 | (get_identifier ("P_ARRAY"), | |
3499 | gnu_ptr_array, | |
3500 | gnu_type, 0, 0, 0, 0)), | |
3501 | create_field_decl (get_identifier ("P_BOUNDS"), | |
3502 | gnu_ptr_template, | |
3503 | gnu_type, 0, 0, 0, 0)); | |
3504 | ||
3505 | /* Make sure we can place this into a register. */ | |
3506 | TYPE_ALIGN (gnu_type) | |
3507 | = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE); | |
3508 | TYPE_IS_FAT_POINTER_P (gnu_type) = 1; | |
3509 | ||
3510 | /* Do not finalize this record type since the types of | |
3511 | its fields are incomplete. */ | |
3512 | finish_record_type (gnu_type, fields, 0, true); | |
3513 | ||
3514 | TYPE_OBJECT_RECORD_TYPE (gnu_old) = make_node (RECORD_TYPE); | |
3515 | TYPE_NAME (TYPE_OBJECT_RECORD_TYPE (gnu_old)) | |
e3698827 | 3516 | = create_concat_name (gnat_desig_equiv, "XUT"); |
27becfc8 | 3517 | TYPE_DUMMY_P (TYPE_OBJECT_RECORD_TYPE (gnu_old)) = 1; |
3518 | } | |
3519 | } | |
3520 | ||
3521 | /* If we already know what the full type is, use it. */ | |
3522 | else if (Present (gnat_desig_full) | |
3523 | && present_gnu_tree (gnat_desig_full)) | |
3524 | gnu_desig_type = TREE_TYPE (get_gnu_tree (gnat_desig_full)); | |
3525 | ||
3526 | /* Get the type of the thing we are to point to and build a pointer | |
3527 | to it. If it is a reference to an incomplete or private type with a | |
3528 | full view that is a record, make a dummy type node and get the | |
3529 | actual type later when we have verified it is safe. */ | |
3530 | else if ((! in_main_unit | |
3531 | && ! present_gnu_tree (gnat_desig_equiv) | |
3532 | && Present (gnat_desig_full) | |
3533 | && ! present_gnu_tree (gnat_desig_full) | |
3534 | && Is_Record_Type (gnat_desig_full)) | |
3535 | /* Likewise if we are pointing to a record or array and we | |
3536 | are to defer elaborating incomplete types. We do this | |
3537 | since this access type may be the full view of some | |
3538 | private type. Note that the unconstrained array case is | |
ea5ec53d | 3539 | handled above. */ |
27becfc8 | 3540 | || ((! in_main_unit || imported_p) |
3541 | && defer_incomplete_level != 0 | |
3542 | && ! present_gnu_tree (gnat_desig_equiv) | |
3543 | && ((Is_Record_Type (gnat_desig_rep) | |
3544 | || Is_Array_Type (gnat_desig_rep)))) | |
3545 | /* If this is a reference from a limited_with type back to our | |
3546 | main unit and there's a Freeze_Node for it, either we have | |
3547 | already processed the declaration and made the dummy type, | |
3548 | in which case we just reuse the latter, or we have not yet, | |
3549 | in which case we make the dummy type and it will be reused | |
3550 | when the declaration is processed. In both cases, the | |
3551 | pointer eventually created below will be automatically | |
3552 | adjusted when the Freeze_Node is processed. Note that the | |
ea5ec53d | 3553 | unconstrained array case is handled above. */ |
27becfc8 | 3554 | || (in_main_unit && is_from_limited_with |
3555 | && Present (Freeze_Node (gnat_desig_rep)))) | |
3556 | { | |
3557 | gnu_desig_type = make_dummy_type (gnat_desig_equiv); | |
3558 | made_dummy = true; | |
3559 | } | |
3560 | ||
3561 | /* Otherwise handle the case of a pointer to itself. */ | |
3562 | else if (gnat_desig_equiv == gnat_entity) | |
3563 | { | |
3564 | gnu_type | |
3565 | = build_pointer_type_for_mode (void_type_node, p_mode, | |
3566 | No_Strict_Aliasing (gnat_entity)); | |
3567 | TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type) = gnu_type; | |
3568 | } | |
3569 | ||
3570 | /* If expansion is disabled, the equivalent type of a concurrent | |
3571 | type is absent, so build a dummy pointer type. */ | |
3572 | else if (type_annotate_only && No (gnat_desig_equiv)) | |
3573 | gnu_type = ptr_void_type_node; | |
3574 | ||
3575 | /* Finally, handle the straightforward case where we can just | |
3576 | elaborate our designated type and point to it. */ | |
3577 | else | |
3578 | gnu_desig_type = gnat_to_gnu_type (gnat_desig_equiv); | |
3579 | ||
3580 | /* It is possible that a call to gnat_to_gnu_type above resolved our | |
3581 | type. If so, just return it. */ | |
3582 | if (present_gnu_tree (gnat_entity)) | |
3583 | { | |
3584 | maybe_present = true; | |
3585 | break; | |
3586 | } | |
3587 | ||
3588 | /* If we have a GCC type for the designated type, possibly modify it | |
3589 | if we are pointing only to constant objects and then make a pointer | |
3590 | to it. Don't do this for unconstrained arrays. */ | |
3591 | if (!gnu_type && gnu_desig_type) | |
3592 | { | |
3593 | if (Is_Access_Constant (gnat_entity) | |
3594 | && TREE_CODE (gnu_desig_type) != UNCONSTRAINED_ARRAY_TYPE) | |
3595 | { | |
3596 | gnu_desig_type | |
3597 | = build_qualified_type | |
3598 | (gnu_desig_type, | |
3599 | TYPE_QUALS (gnu_desig_type) | TYPE_QUAL_CONST); | |
3600 | ||
3601 | /* Some extra processing is required if we are building a | |
ea5ec53d | 3602 | pointer to an incomplete type (in the GCC sense). We might |
27becfc8 | 3603 | have such a type if we just made a dummy, or directly out |
3604 | of the call to gnat_to_gnu_type above if we are processing | |
3605 | an access type for a record component designating the | |
3606 | record type itself. */ | |
3607 | if (TYPE_MODE (gnu_desig_type) == VOIDmode) | |
3608 | { | |
3609 | /* We must ensure that the pointer to variant we make will | |
3610 | be processed by update_pointer_to when the initial type | |
ea5ec53d | 3611 | is completed. Pretend we made a dummy and let further |
27becfc8 | 3612 | processing act as usual. */ |
3613 | made_dummy = true; | |
3614 | ||
3615 | /* We must ensure that update_pointer_to will not retrieve | |
3616 | the dummy variant when building a properly qualified | |
ea5ec53d | 3617 | version of the complete type. We take advantage of the |
27becfc8 | 3618 | fact that get_qualified_type is requiring TYPE_NAMEs to |
3619 | match to influence build_qualified_type and then also | |
ea5ec53d | 3620 | update_pointer_to here. */ |
27becfc8 | 3621 | TYPE_NAME (gnu_desig_type) |
3622 | = create_concat_name (gnat_desig_type, "INCOMPLETE_CST"); | |
3623 | } | |
3624 | } | |
3625 | ||
3626 | gnu_type | |
3627 | = build_pointer_type_for_mode (gnu_desig_type, p_mode, | |
3628 | No_Strict_Aliasing (gnat_entity)); | |
3629 | } | |
3630 | ||
3631 | /* If we are not defining this object and we made a dummy pointer, | |
3632 | save our current definition, evaluate the actual type, and replace | |
3633 | the tentative type we made with the actual one. If we are to defer | |
3634 | actually looking up the actual type, make an entry in the | |
3635 | deferred list. If this is from a limited with, we have to defer | |
3636 | to the end of the current spec in two cases: first if the | |
3637 | designated type is in the current unit and second if the access | |
3638 | type is. */ | |
3639 | if ((! in_main_unit || is_from_limited_with) && made_dummy) | |
3640 | { | |
3641 | tree gnu_old_type | |
3642 | = TYPE_FAT_POINTER_P (gnu_type) | |
3643 | ? TYPE_UNCONSTRAINED_ARRAY (gnu_type) : TREE_TYPE (gnu_type); | |
3644 | ||
3645 | if (esize == POINTER_SIZE | |
3646 | && (got_fat_p || TYPE_FAT_POINTER_P (gnu_type))) | |
3647 | gnu_type | |
3648 | = build_pointer_type | |
3649 | (TYPE_OBJECT_RECORD_TYPE | |
3650 | (TYPE_UNCONSTRAINED_ARRAY (gnu_type))); | |
3651 | ||
e3698827 | 3652 | gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list, |
27becfc8 | 3653 | !Comes_From_Source (gnat_entity), |
3654 | debug_info_p, gnat_entity); | |
3655 | this_made_decl = true; | |
3656 | gnu_type = TREE_TYPE (gnu_decl); | |
3657 | save_gnu_tree (gnat_entity, gnu_decl, false); | |
3658 | saved = true; | |
3659 | ||
3660 | if (defer_incomplete_level == 0 | |
3661 | && ! (is_from_limited_with | |
3662 | && (in_main_unit | |
3663 | || In_Extended_Main_Code_Unit (gnat_entity)))) | |
3664 | update_pointer_to (TYPE_MAIN_VARIANT (gnu_old_type), | |
3665 | gnat_to_gnu_type (gnat_desig_equiv)); | |
3666 | ||
3667 | /* Note that the call to gnat_to_gnu_type here might have | |
3668 | updated gnu_old_type directly, in which case it is not a | |
3669 | dummy type any more when we get into update_pointer_to. | |
3670 | ||
3671 | This may happen for instance when the designated type is a | |
3672 | record type, because their elaboration starts with an | |
3673 | initial node from make_dummy_type, which may yield the same | |
3674 | node as the one we got. | |
3675 | ||
3676 | Besides, variants of this non-dummy type might have been | |
ea5ec53d | 3677 | created along the way. update_pointer_to is expected to |
27becfc8 | 3678 | properly take care of those situations. */ |
3679 | else | |
3680 | { | |
3681 | struct incomplete *p | |
3682 | = (struct incomplete *) xmalloc (sizeof | |
3683 | (struct incomplete)); | |
3684 | struct incomplete **head | |
3685 | = (is_from_limited_with | |
3686 | && (in_main_unit | |
3687 | || In_Extended_Main_Code_Unit (gnat_entity)) | |
3688 | ? &defer_limited_with : &defer_incomplete_list); | |
3689 | ||
3690 | p->old_type = gnu_old_type; | |
3691 | p->full_type = gnat_desig_equiv; | |
3692 | p->next = *head; | |
3693 | *head = p; | |
3694 | } | |
3695 | } | |
3696 | } | |
3697 | break; | |
3698 | ||
3699 | case E_Access_Protected_Subprogram_Type: | |
3700 | case E_Anonymous_Access_Protected_Subprogram_Type: | |
3701 | if (type_annotate_only && No (gnat_equiv_type)) | |
3702 | gnu_type = ptr_void_type_node; | |
3703 | else | |
3704 | { | |
ea5ec53d | 3705 | /* The runtime representation is the equivalent type. */ |
27becfc8 | 3706 | gnu_type = gnat_to_gnu_type (gnat_equiv_type); |
ea5ec53d | 3707 | maybe_present = true; |
27becfc8 | 3708 | } |
3709 | ||
3710 | if (Is_Itype (Directly_Designated_Type (gnat_entity)) | |
3711 | && !present_gnu_tree (Directly_Designated_Type (gnat_entity)) | |
3712 | && No (Freeze_Node (Directly_Designated_Type (gnat_entity))) | |
3713 | && !Is_Record_Type (Scope (Directly_Designated_Type (gnat_entity)))) | |
3714 | gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity), | |
3715 | NULL_TREE, 0); | |
3716 | ||
3717 | break; | |
3718 | ||
3719 | case E_Access_Subtype: | |
3720 | ||
3721 | /* We treat this as identical to its base type; any constraint is | |
3722 | meaningful only to the front end. | |
3723 | ||
3724 | The designated type must be elaborated as well, if it does | |
ea5ec53d | 3725 | not have its own freeze node. Designated (sub)types created |
27becfc8 | 3726 | for constrained components of records with discriminants are |
3727 | not frozen by the front end and thus not elaborated by gigi, | |
3728 | because their use may appear before the base type is frozen, | |
3729 | and because it is not clear that they are needed anywhere in | |
ea5ec53d | 3730 | Gigi. With the current model, there is no correct place where |
27becfc8 | 3731 | they could be elaborated. */ |
3732 | ||
3733 | gnu_type = gnat_to_gnu_type (Etype (gnat_entity)); | |
3734 | if (Is_Itype (Directly_Designated_Type (gnat_entity)) | |
3735 | && !present_gnu_tree (Directly_Designated_Type (gnat_entity)) | |
3736 | && Is_Frozen (Directly_Designated_Type (gnat_entity)) | |
3737 | && No (Freeze_Node (Directly_Designated_Type (gnat_entity)))) | |
3738 | { | |
3739 | /* If we are not defining this entity, and we have incomplete | |
3740 | entities being processed above us, make a dummy type and | |
3741 | elaborate it later. */ | |
3742 | if (!definition && defer_incomplete_level != 0) | |
3743 | { | |
3744 | struct incomplete *p | |
3745 | = (struct incomplete *) xmalloc (sizeof (struct incomplete)); | |
3746 | tree gnu_ptr_type | |
3747 | = build_pointer_type | |
3748 | (make_dummy_type (Directly_Designated_Type (gnat_entity))); | |
3749 | ||
3750 | p->old_type = TREE_TYPE (gnu_ptr_type); | |
3751 | p->full_type = Directly_Designated_Type (gnat_entity); | |
3752 | p->next = defer_incomplete_list; | |
3753 | defer_incomplete_list = p; | |
3754 | } | |
3755 | else if (!IN (Ekind (Base_Type | |
3756 | (Directly_Designated_Type (gnat_entity))), | |
3757 | Incomplete_Or_Private_Kind)) | |
3758 | gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity), | |
3759 | NULL_TREE, 0); | |
3760 | } | |
3761 | ||
3762 | maybe_present = true; | |
3763 | break; | |
3764 | ||
3765 | /* Subprogram Entities | |
3766 | ||
3767 | The following access functions are defined for subprograms (functions | |
3768 | or procedures): | |
3769 | ||
3770 | First_Formal The first formal parameter. | |
3771 | Is_Imported Indicates that the subprogram has appeared in | |
ea5ec53d | 3772 | an INTERFACE or IMPORT pragma. For now we |
27becfc8 | 3773 | assume that the external language is C. |
3774 | Is_Exported Likewise but for an EXPORT pragma. | |
3775 | Is_Inlined True if the subprogram is to be inlined. | |
3776 | ||
3777 | In addition for function subprograms we have: | |
3778 | ||
3779 | Etype Return type of the function. | |
3780 | ||
3781 | Each parameter is first checked by calling must_pass_by_ref on its | |
3782 | type to determine if it is passed by reference. For parameters which | |
3783 | are copied in, if they are Ada In Out or Out parameters, their return | |
3784 | value becomes part of a record which becomes the return type of the | |
3785 | function (C function - note that this applies only to Ada procedures | |
ea5ec53d | 3786 | so there is no Ada return type). Additional code to store back the |
27becfc8 | 3787 | parameters will be generated on the caller side. This transformation |
3788 | is done here, not in the front-end. | |
3789 | ||
3790 | The intended result of the transformation can be seen from the | |
3791 | equivalent source rewritings that follow: | |
3792 | ||
3793 | struct temp {int a,b}; | |
3794 | procedure P (A,B: In Out ...) is temp P (int A,B) | |
3795 | begin { | |
3796 | .. .. | |
3797 | end P; return {A,B}; | |
3798 | } | |
3799 | ||
3800 | temp t; | |
3801 | P(X,Y); t = P(X,Y); | |
3802 | X = t.a , Y = t.b; | |
3803 | ||
3804 | For subprogram types we need to perform mainly the same conversions to | |
3805 | GCC form that are needed for procedures and function declarations. The | |
3806 | only difference is that at the end, we make a type declaration instead | |
3807 | of a function declaration. */ | |
3808 | ||
3809 | case E_Subprogram_Type: | |
3810 | case E_Function: | |
3811 | case E_Procedure: | |
3812 | { | |
3813 | /* The first GCC parameter declaration (a PARM_DECL node). The | |
3814 | PARM_DECL nodes are chained through the TREE_CHAIN field, so this | |
3815 | actually is the head of this parameter list. */ | |
3816 | tree gnu_param_list = NULL_TREE; | |
3817 | /* Likewise for the stub associated with an exported procedure. */ | |
3818 | tree gnu_stub_param_list = NULL_TREE; | |
ea5ec53d | 3819 | /* The type returned by a function. If the subprogram is a procedure |
27becfc8 | 3820 | this type should be void_type_node. */ |
3821 | tree gnu_return_type = void_type_node; | |
3822 | /* List of fields in return type of procedure with copy-in copy-out | |
3823 | parameters. */ | |
3824 | tree gnu_field_list = NULL_TREE; | |
3825 | /* Non-null for subprograms containing parameters passed by copy-in | |
3826 | copy-out (Ada In Out or Out parameters not passed by reference), | |
3827 | in which case it is the list of nodes used to specify the values of | |
3828 | the in out/out parameters that are returned as a record upon | |
3829 | procedure return. The TREE_PURPOSE of an element of this list is | |
3830 | a field of the record and the TREE_VALUE is the PARM_DECL | |
3831 | corresponding to that field. This list will be saved in the | |
3832 | TYPE_CI_CO_LIST field of the FUNCTION_TYPE node we create. */ | |
3833 | tree gnu_return_list = NULL_TREE; | |
3834 | /* If an import pragma asks to map this subprogram to a GCC builtin, | |
3835 | this is the builtin DECL node. */ | |
3836 | tree gnu_builtin_decl = NULL_TREE; | |
3837 | /* For the stub associated with an exported procedure. */ | |
3838 | tree gnu_stub_type = NULL_TREE, gnu_stub_name = NULL_TREE; | |
3839 | tree gnu_ext_name = create_concat_name (gnat_entity, NULL); | |
3840 | Entity_Id gnat_param; | |
3841 | bool inline_flag = Is_Inlined (gnat_entity); | |
3842 | bool public_flag = Is_Public (gnat_entity) || imported_p; | |
3843 | bool extern_flag | |
3844 | = (Is_Public (gnat_entity) && !definition) || imported_p; | |
02f226ee | 3845 | |
3846 | /* The semantics of "pure" in Ada essentially matches that of "const" | |
3847 | in the back-end. In particular, both properties are orthogonal to | |
3848 | the "nothrow" property if the EH circuitry is explicit in the | |
3849 | internal representation of the back-end. If we are to completely | |
3850 | hide the EH circuitry from it, we need to declare that calls to pure | |
3851 | Ada subprograms that can throw have side effects since they can | |
3852 | trigger an "abnormal" transfer of control flow; thus they can be | |
3853 | neither "const" nor "pure" in the back-end sense. */ | |
3854 | bool const_flag | |
3855 | = (Exception_Mechanism == Back_End_Exceptions | |
3856 | && Is_Pure (gnat_entity)); | |
3857 | ||
27becfc8 | 3858 | bool volatile_flag = No_Return (gnat_entity); |
3859 | bool returns_by_ref = false; | |
3860 | bool returns_unconstrained = false; | |
3861 | bool returns_by_target_ptr = false; | |
3862 | bool has_copy_in_out = false; | |
3863 | bool has_stub = false; | |
3864 | int parmnum; | |
3865 | ||
3866 | if (kind == E_Subprogram_Type && !definition) | |
3867 | /* A parameter may refer to this type, so defer completion | |
3868 | of any incomplete types. */ | |
3869 | defer_incomplete_level++, this_deferred = true; | |
3870 | ||
3871 | /* If the subprogram has an alias, it is probably inherited, so | |
3872 | we can use the original one. If the original "subprogram" | |
3873 | is actually an enumeration literal, it may be the first use | |
3874 | of its type, so we must elaborate that type now. */ | |
3875 | if (Present (Alias (gnat_entity))) | |
3876 | { | |
3877 | if (Ekind (Alias (gnat_entity)) == E_Enumeration_Literal) | |
3878 | gnat_to_gnu_entity (Etype (Alias (gnat_entity)), NULL_TREE, 0); | |
3879 | ||
3880 | gnu_decl = gnat_to_gnu_entity (Alias (gnat_entity), | |
3881 | gnu_expr, 0); | |
3882 | ||
3883 | /* Elaborate any Itypes in the parameters of this entity. */ | |
3884 | for (gnat_temp = First_Formal_With_Extras (gnat_entity); | |
3885 | Present (gnat_temp); | |
3886 | gnat_temp = Next_Formal_With_Extras (gnat_temp)) | |
3887 | if (Is_Itype (Etype (gnat_temp))) | |
3888 | gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0); | |
3889 | ||
3890 | break; | |
3891 | } | |
3892 | ||
3893 | /* If this subprogram is expectedly bound to a GCC builtin, fetch the | |
3894 | corresponding DECL node. | |
3895 | ||
3896 | We still want the parameter associations to take place because the | |
3897 | proper generation of calls depends on it (a GNAT parameter without | |
3898 | a corresponding GCC tree has a very specific meaning), so we don't | |
3899 | just break here. */ | |
3900 | if (Convention (gnat_entity) == Convention_Intrinsic) | |
3901 | gnu_builtin_decl = builtin_decl_for (gnu_ext_name); | |
3902 | ||
3903 | /* ??? What if we don't find the builtin node above ? warn ? err ? | |
3904 | In the current state we neither warn nor err, and calls will just | |
ea5ec53d | 3905 | be handled as for regular subprograms. */ |
27becfc8 | 3906 | |
3907 | if (kind == E_Function || kind == E_Subprogram_Type) | |
3908 | gnu_return_type = gnat_to_gnu_type (Etype (gnat_entity)); | |
3909 | ||
3910 | /* If this function returns by reference, make the actual | |
3911 | return type of this function the pointer and mark the decl. */ | |
3912 | if (Returns_By_Ref (gnat_entity)) | |
3913 | { | |
3914 | returns_by_ref = true; | |
3915 | gnu_return_type = build_pointer_type (gnu_return_type); | |
3916 | } | |
3917 | ||
3918 | /* If the Mechanism is By_Reference, ensure the return type uses | |
3919 | the machine's by-reference mechanism, which may not the same | |
3920 | as above (e.g., it might be by passing a fake parameter). */ | |
3921 | else if (kind == E_Function | |
3922 | && Mechanism (gnat_entity) == By_Reference) | |
3923 | { | |
3924 | TREE_ADDRESSABLE (gnu_return_type) = 1; | |
3925 | ||
3926 | /* We expect this bit to be reset by gigi shortly, so can avoid a | |
3927 | type node copy here. This actually also prevents troubles with | |
3928 | the generation of debug information for the function, because | |
3929 | we might have issued such info for this type already, and would | |
3930 | be attaching a distinct type node to the function if we made a | |
3931 | copy here. */ | |
3932 | } | |
3933 | ||
3934 | /* If we are supposed to return an unconstrained array, | |
3935 | actually return a fat pointer and make a note of that. Return | |
3936 | a pointer to an unconstrained record of variable size. */ | |
3937 | else if (TREE_CODE (gnu_return_type) == UNCONSTRAINED_ARRAY_TYPE) | |
3938 | { | |
3939 | gnu_return_type = TREE_TYPE (gnu_return_type); | |
3940 | returns_unconstrained = true; | |
3941 | } | |
3942 | ||
3943 | /* If the type requires a transient scope, the result is allocated | |
3944 | on the secondary stack, so the result type of the function is | |
3945 | just a pointer. */ | |
3946 | else if (Requires_Transient_Scope (Etype (gnat_entity))) | |
3947 | { | |
3948 | gnu_return_type = build_pointer_type (gnu_return_type); | |
3949 | returns_unconstrained = true; | |
3950 | } | |
3951 | ||
3952 | /* If the type is a padded type and the underlying type would not | |
3953 | be passed by reference or this function has a foreign convention, | |
3954 | return the underlying type. */ | |
3955 | else if (TREE_CODE (gnu_return_type) == RECORD_TYPE | |
3956 | && TYPE_IS_PADDING_P (gnu_return_type) | |
3957 | && (!default_pass_by_ref (TREE_TYPE | |
3958 | (TYPE_FIELDS (gnu_return_type))) | |
3959 | || Has_Foreign_Convention (gnat_entity))) | |
3960 | gnu_return_type = TREE_TYPE (TYPE_FIELDS (gnu_return_type)); | |
3961 | ||
3962 | /* If the return type has a non-constant size, we convert the function | |
3963 | into a procedure and its caller will pass a pointer to an object as | |
3964 | the first parameter when we call the function. This can happen for | |
3965 | an unconstrained type with a maximum size or a constrained type with | |
3966 | a size not known at compile time. */ | |
3967 | if (TYPE_SIZE_UNIT (gnu_return_type) | |
3968 | && !TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type))) | |
3969 | { | |
3970 | returns_by_target_ptr = true; | |
3971 | gnu_param_list | |
3972 | = create_param_decl (get_identifier ("TARGET"), | |
3973 | build_reference_type (gnu_return_type), | |
3974 | true); | |
3975 | gnu_return_type = void_type_node; | |
3976 | } | |
3977 | ||
3978 | /* If the return type has a size that overflows, we cannot have | |
3979 | a function that returns that type. This usage doesn't make | |
3980 | sense anyway, so give an error here. */ | |
3981 | if (TYPE_SIZE_UNIT (gnu_return_type) | |
3982 | && TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type)) | |
3983 | && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_return_type))) | |
3984 | { | |
3985 | post_error ("cannot return type whose size overflows", | |
3986 | gnat_entity); | |
3987 | gnu_return_type = copy_node (gnu_return_type); | |
3988 | TYPE_SIZE (gnu_return_type) = bitsize_zero_node; | |
3989 | TYPE_SIZE_UNIT (gnu_return_type) = size_zero_node; | |
3990 | TYPE_MAIN_VARIANT (gnu_return_type) = gnu_return_type; | |
3991 | TYPE_NEXT_VARIANT (gnu_return_type) = NULL_TREE; | |
3992 | } | |
3993 | ||
3994 | /* Look at all our parameters and get the type of | |
3995 | each. While doing this, build a copy-out structure if | |
3996 | we need one. */ | |
3997 | ||
3998 | /* Loop over the parameters and get their associated GCC tree. | |
3999 | While doing this, build a copy-out structure if we need one. */ | |
4000 | for (gnat_param = First_Formal_With_Extras (gnat_entity), parmnum = 0; | |
4001 | Present (gnat_param); | |
4002 | gnat_param = Next_Formal_With_Extras (gnat_param), parmnum++) | |
4003 | { | |
4004 | tree gnu_param_name = get_entity_name (gnat_param); | |
4005 | tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param)); | |
4006 | tree gnu_param, gnu_field; | |
4007 | bool copy_in_copy_out = false; | |
4008 | Mechanism_Type mech = Mechanism (gnat_param); | |
4009 | ||
4010 | /* Builtins are expanded inline and there is no real call sequence | |
4011 | involved. So the type expected by the underlying expander is | |
4012 | always the type of each argument "as is". */ | |
4013 | if (gnu_builtin_decl) | |
4014 | mech = By_Copy; | |
4015 | /* Handle the first parameter of a valued procedure specially. */ | |
4016 | else if (Is_Valued_Procedure (gnat_entity) && parmnum == 0) | |
4017 | mech = By_Copy_Return; | |
4018 | /* Otherwise, see if a Mechanism was supplied that forced this | |
4019 | parameter to be passed one way or another. */ | |
4020 | else if (mech == Default | |
4021 | || mech == By_Copy || mech == By_Reference) | |
4022 | ; | |
4023 | else if (By_Descriptor_Last <= mech && mech <= By_Descriptor) | |
4024 | mech = By_Descriptor; | |
81dd70cd | 4025 | |
4026 | else if (By_Short_Descriptor_Last <= mech && | |
4027 | mech <= By_Short_Descriptor) | |
4028 | mech = By_Short_Descriptor; | |
4029 | ||
27becfc8 | 4030 | else if (mech > 0) |
4031 | { | |
4032 | if (TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE | |
4033 | || TREE_CODE (TYPE_SIZE (gnu_param_type)) != INTEGER_CST | |
4034 | || 0 < compare_tree_int (TYPE_SIZE (gnu_param_type), | |
4035 | mech)) | |
4036 | mech = By_Reference; | |
4037 | else | |
4038 | mech = By_Copy; | |
4039 | } | |
4040 | else | |
4041 | { | |
4042 | post_error ("unsupported mechanism for&", gnat_param); | |
4043 | mech = Default; | |
4044 | } | |
4045 | ||
4046 | gnu_param | |
4047 | = gnat_to_gnu_param (gnat_param, mech, gnat_entity, | |
4048 | Has_Foreign_Convention (gnat_entity), | |
4049 | ©_in_copy_out); | |
4050 | ||
4051 | /* We are returned either a PARM_DECL or a type if no parameter | |
4052 | needs to be passed; in either case, adjust the type. */ | |
4053 | if (DECL_P (gnu_param)) | |
4054 | gnu_param_type = TREE_TYPE (gnu_param); | |
4055 | else | |
4056 | { | |
4057 | gnu_param_type = gnu_param; | |
4058 | gnu_param = NULL_TREE; | |
4059 | } | |
4060 | ||
4061 | if (gnu_param) | |
4062 | { | |
4063 | /* If it's an exported subprogram, we build a parameter list | |
4064 | in parallel, in case we need to emit a stub for it. */ | |
4065 | if (Is_Exported (gnat_entity)) | |
4066 | { | |
4067 | gnu_stub_param_list | |
4068 | = chainon (gnu_param, gnu_stub_param_list); | |
4069 | /* Change By_Descriptor parameter to By_Reference for | |
4070 | the internal version of an exported subprogram. */ | |
81dd70cd | 4071 | if (mech == By_Descriptor || mech == By_Short_Descriptor) |
27becfc8 | 4072 | { |
4073 | gnu_param | |
4074 | = gnat_to_gnu_param (gnat_param, By_Reference, | |
4075 | gnat_entity, false, | |
4076 | ©_in_copy_out); | |
4077 | has_stub = true; | |
4078 | } | |
4079 | else | |
4080 | gnu_param = copy_node (gnu_param); | |
4081 | } | |
4082 | ||
4083 | gnu_param_list = chainon (gnu_param, gnu_param_list); | |
4084 | Sloc_to_locus (Sloc (gnat_param), | |
4085 | &DECL_SOURCE_LOCATION (gnu_param)); | |
4086 | save_gnu_tree (gnat_param, gnu_param, false); | |
4087 | ||
4088 | /* If a parameter is a pointer, this function may modify | |
4089 | memory through it and thus shouldn't be considered | |
02f226ee | 4090 | a const function. Also, the memory may be modified |
27becfc8 | 4091 | between two calls, so they can't be CSE'ed. The latter |
4092 | case also handles by-ref parameters. */ | |
4093 | if (POINTER_TYPE_P (gnu_param_type) | |
4094 | || TYPE_FAT_POINTER_P (gnu_param_type)) | |
02f226ee | 4095 | const_flag = false; |
27becfc8 | 4096 | } |
4097 | ||
4098 | if (copy_in_copy_out) | |
4099 | { | |
4100 | if (!has_copy_in_out) | |
4101 | { | |
4102 | gcc_assert (TREE_CODE (gnu_return_type) == VOID_TYPE); | |
4103 | gnu_return_type = make_node (RECORD_TYPE); | |
4104 | TYPE_NAME (gnu_return_type) = get_identifier ("RETURN"); | |
4105 | has_copy_in_out = true; | |
4106 | } | |
4107 | ||
4108 | gnu_field = create_field_decl (gnu_param_name, gnu_param_type, | |
4109 | gnu_return_type, 0, 0, 0, 0); | |
4110 | Sloc_to_locus (Sloc (gnat_param), | |
4111 | &DECL_SOURCE_LOCATION (gnu_field)); | |
4112 | TREE_CHAIN (gnu_field) = gnu_field_list; | |
4113 | gnu_field_list = gnu_field; | |
4114 | gnu_return_list = tree_cons (gnu_field, gnu_param, | |
4115 | gnu_return_list); | |
4116 | } | |
4117 | } | |
4118 | ||
4119 | /* Do not compute record for out parameters if subprogram is | |
4120 | stubbed since structures are incomplete for the back-end. */ | |
4121 | if (gnu_field_list && Convention (gnat_entity) != Convention_Stubbed) | |
4122 | finish_record_type (gnu_return_type, nreverse (gnu_field_list), | |
4123 | 0, false); | |
4124 | ||
4125 | /* If we have a CICO list but it has only one entry, we convert | |
4126 | this function into a function that simply returns that one | |
4127 | object. */ | |
4128 | if (list_length (gnu_return_list) == 1) | |
4129 | gnu_return_type = TREE_TYPE (TREE_PURPOSE (gnu_return_list)); | |
4130 | ||
4131 | if (Has_Stdcall_Convention (gnat_entity)) | |
4132 | prepend_one_attribute_to | |
4133 | (&attr_list, ATTR_MACHINE_ATTRIBUTE, | |
4134 | get_identifier ("stdcall"), NULL_TREE, | |
4135 | gnat_entity); | |
4136 | ||
4137 | /* If we are on a target where stack realignment is needed for 'main' | |
4138 | to honor GCC's implicit expectations (stack alignment greater than | |
4139 | what the base ABI guarantees), ensure we do the same for foreign | |
4140 | convention subprograms as they might be used as callbacks from code | |
4141 | breaking such expectations. Note that this applies to task entry | |
4142 | points in particular. */ | |
4143 | if (FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN | |
4144 | && Has_Foreign_Convention (gnat_entity)) | |
4145 | prepend_one_attribute_to | |
4146 | (&attr_list, ATTR_MACHINE_ATTRIBUTE, | |
4147 | get_identifier ("force_align_arg_pointer"), NULL_TREE, | |
4148 | gnat_entity); | |
4149 | ||
4150 | /* The lists have been built in reverse. */ | |
4151 | gnu_param_list = nreverse (gnu_param_list); | |
4152 | if (has_stub) | |
4153 | gnu_stub_param_list = nreverse (gnu_stub_param_list); | |
4154 | gnu_return_list = nreverse (gnu_return_list); | |
4155 | ||
4156 | if (Ekind (gnat_entity) == E_Function) | |
4157 | Set_Mechanism (gnat_entity, | |
4158 | (returns_by_ref || returns_unconstrained | |
4159 | ? By_Reference : By_Copy)); | |
4160 | gnu_type | |
4161 | = create_subprog_type (gnu_return_type, gnu_param_list, | |
4162 | gnu_return_list, returns_unconstrained, | |
4163 | returns_by_ref, returns_by_target_ptr); | |
4164 | ||
4165 | if (has_stub) | |
4166 | gnu_stub_type | |
4167 | = create_subprog_type (gnu_return_type, gnu_stub_param_list, | |
4168 | gnu_return_list, returns_unconstrained, | |
4169 | returns_by_ref, returns_by_target_ptr); | |
4170 | ||
4171 | /* A subprogram (something that doesn't return anything) shouldn't | |
02f226ee | 4172 | be considered const since there would be no reason for such a |
27becfc8 | 4173 | subprogram. Note that procedures with Out (or In Out) parameters |
ea5ec53d | 4174 | have already been converted into a function with a return type. */ |
27becfc8 | 4175 | if (TREE_CODE (gnu_return_type) == VOID_TYPE) |
02f226ee | 4176 | const_flag = false; |
915e4127 | 4177 | |
27becfc8 | 4178 | gnu_type |
4179 | = build_qualified_type (gnu_type, | |
4180 | TYPE_QUALS (gnu_type) | |
02f226ee | 4181 | | (TYPE_QUAL_CONST * const_flag) |
27becfc8 | 4182 | | (TYPE_QUAL_VOLATILE * volatile_flag)); |
4183 | ||
4184 | Sloc_to_locus (Sloc (gnat_entity), &input_location); | |
4185 | ||
4186 | if (has_stub) | |
4187 | gnu_stub_type | |
4188 | = build_qualified_type (gnu_stub_type, | |
4189 | TYPE_QUALS (gnu_stub_type) | |
02f226ee | 4190 | | (TYPE_QUAL_CONST * const_flag) |
27becfc8 | 4191 | | (TYPE_QUAL_VOLATILE * volatile_flag)); |
4192 | ||
4193 | /* If we have a builtin decl for that function, check the signatures | |
4194 | compatibilities. If the signatures are compatible, use the builtin | |
4195 | decl. If they are not, we expect the checker predicate to have | |
4196 | posted the appropriate errors, and just continue with what we have | |
4197 | so far. */ | |
4198 | if (gnu_builtin_decl) | |
4199 | { | |
4200 | tree gnu_builtin_type = TREE_TYPE (gnu_builtin_decl); | |
4201 | ||
4202 | if (compatible_signatures_p (gnu_type, gnu_builtin_type)) | |
4203 | { | |
4204 | gnu_decl = gnu_builtin_decl; | |
4205 | gnu_type = gnu_builtin_type; | |
4206 | break; | |
4207 | } | |
4208 | } | |
4209 | ||
4210 | /* If there was no specified Interface_Name and the external and | |
4211 | internal names of the subprogram are the same, only use the | |
4212 | internal name to allow disambiguation of nested subprograms. */ | |
e3698827 | 4213 | if (No (Interface_Name (gnat_entity)) |
4214 | && gnu_ext_name == gnu_entity_name) | |
27becfc8 | 4215 | gnu_ext_name = NULL_TREE; |
4216 | ||
4217 | /* If we are defining the subprogram and it has an Address clause | |
4218 | we must get the address expression from the saved GCC tree for the | |
4219 | subprogram if it has a Freeze_Node. Otherwise, we elaborate | |
4220 | the address expression here since the front-end has guaranteed | |
4221 | in that case that the elaboration has no effects. If there is | |
4222 | an Address clause and we are not defining the object, just | |
4223 | make it a constant. */ | |
4224 | if (Present (Address_Clause (gnat_entity))) | |
4225 | { | |
4226 | tree gnu_address = NULL_TREE; | |
4227 | ||
4228 | if (definition) | |
4229 | gnu_address | |
4230 | = (present_gnu_tree (gnat_entity) | |
4231 | ? get_gnu_tree (gnat_entity) | |
4232 | : gnat_to_gnu (Expression (Address_Clause (gnat_entity)))); | |
4233 | ||
4234 | save_gnu_tree (gnat_entity, NULL_TREE, false); | |
4235 | ||
4236 | /* Convert the type of the object to a reference type that can | |
4237 | alias everything as per 13.3(19). */ | |
4238 | gnu_type | |
4239 | = build_reference_type_for_mode (gnu_type, ptr_mode, true); | |
4240 | if (gnu_address) | |
4241 | gnu_address = convert (gnu_type, gnu_address); | |
4242 | ||
4243 | gnu_decl | |
e3698827 | 4244 | = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type, |
27becfc8 | 4245 | gnu_address, false, Is_Public (gnat_entity), |
4246 | extern_flag, false, NULL, gnat_entity); | |
4247 | DECL_BY_REF_P (gnu_decl) = 1; | |
4248 | } | |
4249 | ||
4250 | else if (kind == E_Subprogram_Type) | |
e3698827 | 4251 | gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list, |
27becfc8 | 4252 | !Comes_From_Source (gnat_entity), |
4253 | debug_info_p, gnat_entity); | |
4254 | else | |
4255 | { | |
4256 | if (has_stub) | |
4257 | { | |
4258 | gnu_stub_name = gnu_ext_name; | |
4259 | gnu_ext_name = create_concat_name (gnat_entity, "internal"); | |
4260 | public_flag = false; | |
4261 | } | |
4262 | ||
e3698827 | 4263 | gnu_decl = create_subprog_decl (gnu_entity_name, gnu_ext_name, |
27becfc8 | 4264 | gnu_type, gnu_param_list, |
4265 | inline_flag, public_flag, | |
4266 | extern_flag, attr_list, | |
4267 | gnat_entity); | |
4268 | if (has_stub) | |
4269 | { | |
4270 | tree gnu_stub_decl | |
e3698827 | 4271 | = create_subprog_decl (gnu_entity_name, gnu_stub_name, |
27becfc8 | 4272 | gnu_stub_type, gnu_stub_param_list, |
4273 | inline_flag, true, | |
4274 | extern_flag, attr_list, | |
4275 | gnat_entity); | |
4276 | SET_DECL_FUNCTION_STUB (gnu_decl, gnu_stub_decl); | |
4277 | } | |
4278 | ||
4279 | /* This is unrelated to the stub built right above. */ | |
4280 | DECL_STUBBED_P (gnu_decl) | |
4281 | = Convention (gnat_entity) == Convention_Stubbed; | |
4282 | } | |
4283 | } | |
4284 | break; | |
4285 | ||
4286 | case E_Incomplete_Type: | |
4287 | case E_Incomplete_Subtype: | |
4288 | case E_Private_Type: | |
4289 | case E_Private_Subtype: | |
4290 | case E_Limited_Private_Type: | |
4291 | case E_Limited_Private_Subtype: | |
4292 | case E_Record_Type_With_Private: | |
4293 | case E_Record_Subtype_With_Private: | |
4294 | { | |
4295 | /* Get the "full view" of this entity. If this is an incomplete | |
4296 | entity from a limited with, treat its non-limited view as the | |
4297 | full view. Otherwise, use either the full view or the underlying | |
4298 | full view, whichever is present. This is used in all the tests | |
4299 | below. */ | |
4300 | Entity_Id full_view | |
4301 | = (IN (Ekind (gnat_entity), Incomplete_Kind) | |
4302 | && From_With_Type (gnat_entity)) | |
4303 | ? Non_Limited_View (gnat_entity) | |
4304 | : Present (Full_View (gnat_entity)) | |
4305 | ? Full_View (gnat_entity) | |
4306 | : Underlying_Full_View (gnat_entity); | |
4307 | ||
4308 | /* If this is an incomplete type with no full view, it must be a Taft | |
4309 | Amendment type, in which case we return a dummy type. Otherwise, | |
4310 | just get the type from its Etype. */ | |
4311 | if (No (full_view)) | |
4312 | { | |
4313 | if (kind == E_Incomplete_Type) | |
515c6c6c | 4314 | { |
4315 | gnu_type = make_dummy_type (gnat_entity); | |
4316 | gnu_decl = TYPE_STUB_DECL (gnu_type); | |
4317 | } | |
27becfc8 | 4318 | else |
4319 | { | |
4320 | gnu_decl = gnat_to_gnu_entity (Etype (gnat_entity), | |
4321 | NULL_TREE, 0); | |
4322 | maybe_present = true; | |
4323 | } | |
4324 | break; | |
4325 | } | |
4326 | ||
4327 | /* If we already made a type for the full view, reuse it. */ | |
4328 | else if (present_gnu_tree (full_view)) | |
4329 | { | |
4330 | gnu_decl = get_gnu_tree (full_view); | |
4331 | break; | |
4332 | } | |
4333 | ||
4334 | /* Otherwise, if we are not defining the type now, get the type | |
4335 | from the full view. But always get the type from the full view | |
4336 | for define on use types, since otherwise we won't see them! */ | |
4337 | else if (!definition | |
4338 | || (Is_Itype (full_view) | |
4339 | && No (Freeze_Node (gnat_entity))) | |
4340 | || (Is_Itype (gnat_entity) | |
4341 | && No (Freeze_Node (full_view)))) | |
4342 | { | |
4343 | gnu_decl = gnat_to_gnu_entity (full_view, NULL_TREE, 0); | |
4344 | maybe_present = true; | |
4345 | break; | |
4346 | } | |
4347 | ||
4348 | /* For incomplete types, make a dummy type entry which will be | |
515c6c6c | 4349 | replaced later. Save it as the full declaration's type so |
4350 | we can do any needed updates when we see it. */ | |
27becfc8 | 4351 | gnu_type = make_dummy_type (gnat_entity); |
515c6c6c | 4352 | gnu_decl = TYPE_STUB_DECL (gnu_type); |
27becfc8 | 4353 | save_gnu_tree (full_view, gnu_decl, 0); |
4354 | break; | |
4355 | } | |
4356 | ||
4357 | /* Simple class_wide types are always viewed as their root_type | |
4358 | by Gigi unless an Equivalent_Type is specified. */ | |
4359 | case E_Class_Wide_Type: | |
4360 | gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0); | |
4361 | maybe_present = true; | |
4362 | break; | |
4363 | ||
4364 | case E_Task_Type: | |
4365 | case E_Task_Subtype: | |
4366 | case E_Protected_Type: | |
4367 | case E_Protected_Subtype: | |
4368 | if (type_annotate_only && No (gnat_equiv_type)) | |
4369 | gnu_type = void_type_node; | |
4370 | else | |
4371 | gnu_type = gnat_to_gnu_type (gnat_equiv_type); | |
4372 | ||
4373 | maybe_present = true; | |
4374 | break; | |
4375 | ||
4376 | case E_Label: | |
e3698827 | 4377 | gnu_decl = create_label_decl (gnu_entity_name); |
27becfc8 | 4378 | break; |
4379 | ||
4380 | case E_Block: | |
4381 | case E_Loop: | |
4382 | /* Nothing at all to do here, so just return an ERROR_MARK and claim | |
4383 | we've already saved it, so we don't try to. */ | |
4384 | gnu_decl = error_mark_node; | |
4385 | saved = true; | |
4386 | break; | |
4387 | ||
4388 | default: | |
4389 | gcc_unreachable (); | |
4390 | } | |
4391 | ||
4392 | /* If we had a case where we evaluated another type and it might have | |
4393 | defined this one, handle it here. */ | |
4394 | if (maybe_present && present_gnu_tree (gnat_entity)) | |
4395 | { | |
4396 | gnu_decl = get_gnu_tree (gnat_entity); | |
4397 | saved = true; | |
4398 | } | |
4399 | ||
4400 | /* If we are processing a type and there is either no decl for it or | |
4401 | we just made one, do some common processing for the type, such as | |
4402 | handling alignment and possible padding. */ | |
a002cb99 | 4403 | if (is_type && (!gnu_decl || this_made_decl)) |
27becfc8 | 4404 | { |
4405 | if (Is_Tagged_Type (gnat_entity) | |
4406 | || Is_Class_Wide_Equivalent_Type (gnat_entity)) | |
4407 | TYPE_ALIGN_OK (gnu_type) = 1; | |
4408 | ||
4409 | if (AGGREGATE_TYPE_P (gnu_type) && Is_By_Reference_Type (gnat_entity)) | |
4410 | TYPE_BY_REFERENCE_P (gnu_type) = 1; | |
4411 | ||
4412 | /* ??? Don't set the size for a String_Literal since it is either | |
4413 | confirming or we don't handle it properly (if the low bound is | |
4414 | non-constant). */ | |
4415 | if (!gnu_size && kind != E_String_Literal_Subtype) | |
4416 | gnu_size = validate_size (Esize (gnat_entity), gnu_type, gnat_entity, | |
4417 | TYPE_DECL, false, | |
4418 | Has_Size_Clause (gnat_entity)); | |
4419 | ||
4420 | /* If a size was specified, see if we can make a new type of that size | |
4421 | by rearranging the type, for example from a fat to a thin pointer. */ | |
4422 | if (gnu_size) | |
4423 | { | |
4424 | gnu_type | |
4425 | = make_type_from_size (gnu_type, gnu_size, | |
4426 | Has_Biased_Representation (gnat_entity)); | |
4427 | ||
4428 | if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0) | |
4429 | && operand_equal_p (rm_size (gnu_type), gnu_size, 0)) | |
4430 | gnu_size = 0; | |
4431 | } | |
4432 | ||
4433 | /* If the alignment hasn't already been processed and this is | |
4434 | not an unconstrained array, see if an alignment is specified. | |
4435 | If not, we pick a default alignment for atomic objects. */ | |
4436 | if (align != 0 || TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE) | |
4437 | ; | |
4438 | else if (Known_Alignment (gnat_entity)) | |
4439 | { | |
4440 | align = validate_alignment (Alignment (gnat_entity), gnat_entity, | |
4441 | TYPE_ALIGN (gnu_type)); | |
4442 | ||
4443 | /* Warn on suspiciously large alignments. This should catch | |
4444 | errors about the (alignment,byte)/(size,bit) discrepancy. */ | |
4445 | if (align > BIGGEST_ALIGNMENT && Has_Alignment_Clause (gnat_entity)) | |
4446 | { | |
4447 | tree size; | |
4448 | ||
4449 | /* If a size was specified, take it into account. Otherwise | |
4450 | use the RM size for records as the type size has already | |
4451 | been adjusted to the alignment. */ | |
4452 | if (gnu_size) | |
4453 | size = gnu_size; | |
4454 | else if ((TREE_CODE (gnu_type) == RECORD_TYPE | |
4455 | || TREE_CODE (gnu_type) == UNION_TYPE | |
4456 | || TREE_CODE (gnu_type) == QUAL_UNION_TYPE) | |
4457 | && !TYPE_IS_FAT_POINTER_P (gnu_type)) | |
4458 | size = rm_size (gnu_type); | |
4459 | else | |
4460 | size = TYPE_SIZE (gnu_type); | |
4461 | ||
4462 | /* Consider an alignment as suspicious if the alignment/size | |
4463 | ratio is greater or equal to the byte/bit ratio. */ | |
4464 | if (host_integerp (size, 1) | |
4465 | && align >= TREE_INT_CST_LOW (size) * BITS_PER_UNIT) | |
4466 | post_error_ne ("?suspiciously large alignment specified for&", | |
4467 | Expression (Alignment_Clause (gnat_entity)), | |
4468 | gnat_entity); | |
4469 | } | |
4470 | } | |
4471 | else if (Is_Atomic (gnat_entity) && !gnu_size | |
4472 | && host_integerp (TYPE_SIZE (gnu_type), 1) | |
4473 | && integer_pow2p (TYPE_SIZE (gnu_type))) | |
4474 | align = MIN (BIGGEST_ALIGNMENT, | |
4475 | tree_low_cst (TYPE_SIZE (gnu_type), 1)); | |
4476 | else if (Is_Atomic (gnat_entity) && gnu_size | |
4477 | && host_integerp (gnu_size, 1) | |
4478 | && integer_pow2p (gnu_size)) | |
4479 | align = MIN (BIGGEST_ALIGNMENT, tree_low_cst (gnu_size, 1)); | |
4480 | ||
4481 | /* See if we need to pad the type. If we did, and made a record, | |
4482 | the name of the new type may be changed. So get it back for | |
4483 | us when we make the new TYPE_DECL below. */ | |
4484 | if (gnu_size || align > 0) | |
4485 | gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity, | |
4486 | "PAD", true, definition, false); | |
4487 | ||
4488 | if (TREE_CODE (gnu_type) == RECORD_TYPE | |
4489 | && TYPE_IS_PADDING_P (gnu_type)) | |
4490 | { | |
e3698827 | 4491 | gnu_entity_name = TYPE_NAME (gnu_type); |
4492 | if (TREE_CODE (gnu_entity_name) == TYPE_DECL) | |
4493 | gnu_entity_name = DECL_NAME (gnu_entity_name); | |
27becfc8 | 4494 | } |
4495 | ||
4496 | set_rm_size (RM_Size (gnat_entity), gnu_type, gnat_entity); | |
4497 | ||
4498 | /* If we are at global level, GCC will have applied variable_size to | |
4499 | the type, but that won't have done anything. So, if it's not | |
4500 | a constant or self-referential, call elaborate_expression_1 to | |
4501 | make a variable for the size rather than calculating it each time. | |
4502 | Handle both the RM size and the actual size. */ | |
4503 | if (global_bindings_p () | |
4504 | && TYPE_SIZE (gnu_type) | |
4505 | && !TREE_CONSTANT (TYPE_SIZE (gnu_type)) | |
4506 | && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))) | |
4507 | { | |
4508 | if (TREE_CODE (gnu_type) == RECORD_TYPE | |
4509 | && operand_equal_p (TYPE_ADA_SIZE (gnu_type), | |
4510 | TYPE_SIZE (gnu_type), 0)) | |
4511 | { | |
4512 | TYPE_SIZE (gnu_type) | |
dd02c1ab | 4513 | = elaborate_expression_1 (TYPE_SIZE (gnu_type), |
4514 | gnat_entity, get_identifier ("SIZE"), | |
4515 | definition, false); | |
27becfc8 | 4516 | SET_TYPE_ADA_SIZE (gnu_type, TYPE_SIZE (gnu_type)); |
4517 | } | |
4518 | else | |
4519 | { | |
4520 | TYPE_SIZE (gnu_type) | |
dd02c1ab | 4521 | = elaborate_expression_1 (TYPE_SIZE (gnu_type), |
4522 | gnat_entity, get_identifier ("SIZE"), | |
4523 | definition, false); | |
27becfc8 | 4524 | |
4525 | /* ??? For now, store the size as a multiple of the alignment | |
4526 | in bytes so that we can see the alignment from the tree. */ | |
4527 | TYPE_SIZE_UNIT (gnu_type) | |
4528 | = build_binary_op | |
4529 | (MULT_EXPR, sizetype, | |
4530 | elaborate_expression_1 | |
dd02c1ab | 4531 | (build_binary_op (EXACT_DIV_EXPR, sizetype, |
27becfc8 | 4532 | TYPE_SIZE_UNIT (gnu_type), |
4533 | size_int (TYPE_ALIGN (gnu_type) | |
4534 | / BITS_PER_UNIT)), | |
dd02c1ab | 4535 | gnat_entity, get_identifier ("SIZE_A_UNIT"), |
4536 | definition, false), | |
27becfc8 | 4537 | size_int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT)); |
4538 | ||
4539 | if (TREE_CODE (gnu_type) == RECORD_TYPE) | |
4540 | SET_TYPE_ADA_SIZE | |
4541 | (gnu_type, | |
dd02c1ab | 4542 | elaborate_expression_1 (TYPE_ADA_SIZE (gnu_type), |
27becfc8 | 4543 | gnat_entity, |
27becfc8 | 4544 | get_identifier ("RM_SIZE"), |
dd02c1ab | 4545 | definition, false)); |
27becfc8 | 4546 | } |
4547 | } | |
4548 | ||
4549 | /* If this is a record type or subtype, call elaborate_expression_1 on | |
4550 | any field position. Do this for both global and local types. | |
4551 | Skip any fields that we haven't made trees for to avoid problems with | |
4552 | class wide types. */ | |
4553 | if (IN (kind, Record_Kind)) | |
4554 | for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp); | |
4555 | gnat_temp = Next_Entity (gnat_temp)) | |
4556 | if (Ekind (gnat_temp) == E_Component && present_gnu_tree (gnat_temp)) | |
4557 | { | |
4558 | tree gnu_field = get_gnu_tree (gnat_temp); | |
4559 | ||
4560 | /* ??? Unfortunately, GCC needs to be able to prove the | |
4561 | alignment of this offset and if it's a variable, it can't. | |
4562 | In GCC 3.4, we'll use DECL_OFFSET_ALIGN in some way, but | |
4563 | right now, we have to put in an explicit multiply and | |
4564 | divide by that value. */ | |
4565 | if (!CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (gnu_field))) | |
4566 | { | |
4567 | DECL_FIELD_OFFSET (gnu_field) | |
4568 | = build_binary_op | |
4569 | (MULT_EXPR, sizetype, | |
4570 | elaborate_expression_1 | |
dd02c1ab | 4571 | (build_binary_op (EXACT_DIV_EXPR, sizetype, |
27becfc8 | 4572 | DECL_FIELD_OFFSET (gnu_field), |
4573 | size_int (DECL_OFFSET_ALIGN (gnu_field) | |
4574 | / BITS_PER_UNIT)), | |
dd02c1ab | 4575 | gnat_temp, get_identifier ("OFFSET"), |
4576 | definition, false), | |
27becfc8 | 4577 | size_int (DECL_OFFSET_ALIGN (gnu_field) / BITS_PER_UNIT)); |
4578 | ||
4579 | /* ??? The context of gnu_field is not necessarily gnu_type so | |
4580 | the MULT_EXPR node built above may not be marked by the call | |
4581 | to create_type_decl below. */ | |
4582 | if (global_bindings_p ()) | |
4583 | mark_visited (&DECL_FIELD_OFFSET (gnu_field)); | |
4584 | } | |
4585 | } | |
4586 | ||
4587 | gnu_type = build_qualified_type (gnu_type, | |
4588 | (TYPE_QUALS (gnu_type) | |
4589 | | (TYPE_QUAL_VOLATILE | |
4590 | * Treat_As_Volatile (gnat_entity)))); | |
4591 | ||
4592 | if (Is_Atomic (gnat_entity)) | |
4593 | check_ok_for_atomic (gnu_type, gnat_entity, false); | |
4594 | ||
4595 | if (Present (Alignment_Clause (gnat_entity))) | |
4596 | TYPE_USER_ALIGN (gnu_type) = 1; | |
4597 | ||
4598 | if (Universal_Aliasing (gnat_entity)) | |
4599 | TYPE_UNIVERSAL_ALIASING_P (TYPE_MAIN_VARIANT (gnu_type)) = 1; | |
4600 | ||
4601 | if (!gnu_decl) | |
e3698827 | 4602 | gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list, |
27becfc8 | 4603 | !Comes_From_Source (gnat_entity), |
4604 | debug_info_p, gnat_entity); | |
4605 | else | |
4606 | TREE_TYPE (gnu_decl) = gnu_type; | |
4607 | } | |
4608 | ||
a002cb99 | 4609 | if (is_type && !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl))) |
27becfc8 | 4610 | { |
4611 | gnu_type = TREE_TYPE (gnu_decl); | |
4612 | ||
892fdb03 | 4613 | /* If this is a derived type, relate its alias set to that of its parent |
4614 | to avoid troubles when a call to an inherited primitive is inlined in | |
4615 | a context where a derived object is accessed. The inlined code works | |
4616 | on the parent view so the resulting code may access the same object | |
4617 | using both the parent and the derived alias sets, which thus have to | |
4618 | conflict. As the same issue arises with component references, the | |
4619 | parent alias set also has to conflict with composite types enclosing | |
4620 | derived components. For instance, if we have: | |
4621 | ||
4622 | type D is new T; | |
4623 | type R is record | |
4624 | Component : D; | |
4625 | end record; | |
4626 | ||
4627 | we want T to conflict with both D and R, in addition to R being a | |
4628 | superset of D by record/component construction. | |
4629 | ||
4630 | One way to achieve this is to perform an alias set copy from the | |
4631 | parent to the derived type. This is not quite appropriate, though, | |
4632 | as we don't want separate derived types to conflict with each other: | |
4633 | ||
4634 | type I1 is new Integer; | |
4635 | type I2 is new Integer; | |
4636 | ||
4637 | We want I1 and I2 to both conflict with Integer but we do not want | |
4638 | I1 to conflict with I2, and an alias set copy on derivation would | |
4639 | have that effect. | |
4640 | ||
4641 | The option chosen is to make the alias set of the derived type a | |
4642 | superset of that of its parent type. It trivially fulfills the | |
4643 | simple requirement for the Integer derivation example above, and | |
4644 | the component case as well by superset transitivity: | |
4645 | ||
4646 | superset superset | |
4647 | R ----------> D ----------> T | |
4648 | ||
4649 | The language rules ensure the parent type is already frozen here. */ | |
4650 | if (Is_Derived_Type (gnat_entity)) | |
4651 | { | |
4652 | tree gnu_parent_type = gnat_to_gnu_type (Etype (gnat_entity)); | |
4653 | relate_alias_sets (gnu_type, gnu_parent_type, ALIAS_SET_SUPERSET); | |
4654 | } | |
4655 | ||
27becfc8 | 4656 | /* Back-annotate the Alignment of the type if not already in the |
4657 | tree. Likewise for sizes. */ | |
4658 | if (Unknown_Alignment (gnat_entity)) | |
d4b7e0f5 | 4659 | { |
4660 | unsigned int double_align, align; | |
4661 | bool is_capped_double, align_clause; | |
4662 | ||
4663 | /* If the default alignment of "double" or larger scalar types is | |
4664 | specifically capped and this is not an array with an alignment | |
4665 | clause on the component type, return the cap. */ | |
4666 | if ((double_align = double_float_alignment) > 0) | |
4667 | is_capped_double | |
4668 | = is_double_float_or_array (gnat_entity, &align_clause); | |
4669 | else if ((double_align = double_scalar_alignment) > 0) | |
4670 | is_capped_double | |
4671 | = is_double_scalar_or_array (gnat_entity, &align_clause); | |
4672 | else | |
4673 | is_capped_double = align_clause = false; | |
4674 | ||
4675 | if (is_capped_double && !align_clause) | |
4676 | align = double_align; | |
4677 | else | |
4678 | align = TYPE_ALIGN (gnu_type) / BITS_PER_UNIT; | |
4679 | ||
4680 | Set_Alignment (gnat_entity, UI_From_Int (align)); | |
4681 | } | |
27becfc8 | 4682 | |
4683 | if (Unknown_Esize (gnat_entity) && TYPE_SIZE (gnu_type)) | |
4684 | { | |
4685 | /* If the size is self-referential, we annotate the maximum | |
4686 | value of that size. */ | |
4687 | tree gnu_size = TYPE_SIZE (gnu_type); | |
4688 | ||
4689 | if (CONTAINS_PLACEHOLDER_P (gnu_size)) | |
4690 | gnu_size = max_size (gnu_size, true); | |
4691 | ||
4692 | Set_Esize (gnat_entity, annotate_value (gnu_size)); | |
4693 | ||
4694 | if (type_annotate_only && Is_Tagged_Type (gnat_entity)) | |
4695 | { | |
4696 | /* In this mode the tag and the parent components are not | |
4697 | generated by the front-end, so the sizes must be adjusted | |
ea5ec53d | 4698 | explicitly now. */ |
27becfc8 | 4699 | int size_offset, new_size; |
4700 | ||
4701 | if (Is_Derived_Type (gnat_entity)) | |
4702 | { | |
4703 | size_offset | |
4704 | = UI_To_Int (Esize (Etype (Base_Type (gnat_entity)))); | |
4705 | Set_Alignment (gnat_entity, | |
4706 | Alignment (Etype (Base_Type (gnat_entity)))); | |
4707 | } | |
4708 | else | |
4709 | size_offset = POINTER_SIZE; | |
4710 | ||
4711 | new_size = UI_To_Int (Esize (gnat_entity)) + size_offset; | |
4712 | Set_Esize (gnat_entity, | |
4713 | UI_From_Int (((new_size + (POINTER_SIZE - 1)) | |
4714 | / POINTER_SIZE) * POINTER_SIZE)); | |
4715 | Set_RM_Size (gnat_entity, Esize (gnat_entity)); | |
4716 | } | |
4717 | } | |
4718 | ||
4719 | if (Unknown_RM_Size (gnat_entity) && rm_size (gnu_type)) | |
4720 | Set_RM_Size (gnat_entity, annotate_value (rm_size (gnu_type))); | |
4721 | } | |
4722 | ||
4723 | if (!Comes_From_Source (gnat_entity) && DECL_P (gnu_decl)) | |
4724 | DECL_ARTIFICIAL (gnu_decl) = 1; | |
4725 | ||
4726 | if (!debug_info_p && DECL_P (gnu_decl) | |
4727 | && TREE_CODE (gnu_decl) != FUNCTION_DECL | |
4728 | && No (Renamed_Object (gnat_entity))) | |
4729 | DECL_IGNORED_P (gnu_decl) = 1; | |
4730 | ||
4731 | /* If we haven't already, associate the ..._DECL node that we just made with | |
ea5ec53d | 4732 | the input GNAT entity node. */ |
27becfc8 | 4733 | if (!saved) |
4734 | save_gnu_tree (gnat_entity, gnu_decl, false); | |
4735 | ||
211df513 | 4736 | /* If this is an enumeration or floating-point type, we were not able to set |
4737 | the bounds since they refer to the type. These are always static. */ | |
27becfc8 | 4738 | if ((kind == E_Enumeration_Type && Present (First_Literal (gnat_entity))) |
4739 | || (kind == E_Floating_Point_Type && !Vax_Float (gnat_entity))) | |
4740 | { | |
4741 | tree gnu_scalar_type = gnu_type; | |
a9538d68 | 4742 | tree gnu_low_bound, gnu_high_bound; |
27becfc8 | 4743 | |
4744 | /* If this is a padded type, we need to use the underlying type. */ | |
4745 | if (TREE_CODE (gnu_scalar_type) == RECORD_TYPE | |
4746 | && TYPE_IS_PADDING_P (gnu_scalar_type)) | |
4747 | gnu_scalar_type = TREE_TYPE (TYPE_FIELDS (gnu_scalar_type)); | |
4748 | ||
4749 | /* If this is a floating point type and we haven't set a floating | |
4750 | point type yet, use this in the evaluation of the bounds. */ | |
4751 | if (!longest_float_type_node && kind == E_Floating_Point_Type) | |
211df513 | 4752 | longest_float_type_node = gnu_scalar_type; |
27becfc8 | 4753 | |
a9538d68 | 4754 | gnu_low_bound = gnat_to_gnu (Type_Low_Bound (gnat_entity)); |
4755 | gnu_high_bound = gnat_to_gnu (Type_High_Bound (gnat_entity)); | |
27becfc8 | 4756 | |
211df513 | 4757 | if (kind == E_Enumeration_Type) |
27becfc8 | 4758 | { |
a9538d68 | 4759 | /* Enumeration types have specific RM bounds. */ |
4760 | SET_TYPE_RM_MIN_VALUE (gnu_scalar_type, gnu_low_bound); | |
4761 | SET_TYPE_RM_MAX_VALUE (gnu_scalar_type, gnu_high_bound); | |
4762 | ||
4763 | /* Write full debugging information. Since this has both a | |
4764 | typedef and a tag, avoid outputting the name twice. */ | |
27becfc8 | 4765 | DECL_ARTIFICIAL (gnu_decl) = 1; |
4766 | rest_of_type_decl_compilation (gnu_decl); | |
4767 | } | |
a9538d68 | 4768 | |
4769 | else | |
4770 | { | |
4771 | /* Floating-point types don't have specific RM bounds. */ | |
4772 | TYPE_GCC_MIN_VALUE (gnu_scalar_type) = gnu_low_bound; | |
4773 | TYPE_GCC_MAX_VALUE (gnu_scalar_type) = gnu_high_bound; | |
4774 | } | |
27becfc8 | 4775 | } |
4776 | ||
4777 | /* If we deferred processing of incomplete types, re-enable it. If there | |
4778 | were no other disables and we have some to process, do so. */ | |
4779 | if (this_deferred && --defer_incomplete_level == 0) | |
4780 | { | |
4781 | if (defer_incomplete_list) | |
4782 | { | |
4783 | struct incomplete *incp, *next; | |
4784 | ||
4785 | /* We are back to level 0 for the deferring of incomplete types. | |
4786 | But processing these incomplete types below may itself require | |
4787 | deferring, so preserve what we have and restart from scratch. */ | |
4788 | incp = defer_incomplete_list; | |
4789 | defer_incomplete_list = NULL; | |
4790 | ||
4791 | /* For finalization, however, all types must be complete so we | |
4792 | cannot do the same because deferred incomplete types may end up | |
4793 | referencing each other. Process them all recursively first. */ | |
4794 | defer_finalize_level++; | |
4795 | ||
4796 | for (; incp; incp = next) | |
4797 | { | |
4798 | next = incp->next; | |
4799 | ||
4800 | if (incp->old_type) | |
4801 | update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type), | |
4802 | gnat_to_gnu_type (incp->full_type)); | |
4803 | free (incp); | |
4804 | } | |
4805 | ||
4806 | defer_finalize_level--; | |
4807 | } | |
4808 | ||
4809 | /* All the deferred incomplete types have been processed so we can | |
4810 | now proceed with the finalization of the deferred types. */ | |
4811 | if (defer_finalize_level == 0 && defer_finalize_list) | |
4812 | { | |
4813 | unsigned int i; | |
4814 | tree t; | |
4815 | ||
4816 | for (i = 0; VEC_iterate (tree, defer_finalize_list, i, t); i++) | |
4817 | rest_of_type_decl_compilation_no_defer (t); | |
4818 | ||
4819 | VEC_free (tree, heap, defer_finalize_list); | |
4820 | } | |
4821 | } | |
4822 | ||
4823 | /* If we are not defining this type, see if it's in the incomplete list. | |
4824 | If so, handle that list entry now. */ | |
4825 | else if (!definition) | |
4826 | { | |
4827 | struct incomplete *incp; | |
4828 | ||
4829 | for (incp = defer_incomplete_list; incp; incp = incp->next) | |
4830 | if (incp->old_type && incp->full_type == gnat_entity) | |
4831 | { | |
4832 | update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type), | |
4833 | TREE_TYPE (gnu_decl)); | |
4834 | incp->old_type = NULL_TREE; | |
4835 | } | |
4836 | } | |
4837 | ||
4838 | if (this_global) | |
4839 | force_global--; | |
4840 | ||
153edb51 | 4841 | /* If this is a packed array type whose original array type is itself |
4842 | an Itype without freeze node, make sure the latter is processed. */ | |
27becfc8 | 4843 | if (Is_Packed_Array_Type (gnat_entity) |
153edb51 | 4844 | && Is_Itype (Original_Array_Type (gnat_entity)) |
4845 | && No (Freeze_Node (Original_Array_Type (gnat_entity))) | |
4846 | && !present_gnu_tree (Original_Array_Type (gnat_entity))) | |
4847 | gnat_to_gnu_entity (Original_Array_Type (gnat_entity), NULL_TREE, 0); | |
27becfc8 | 4848 | |
4849 | return gnu_decl; | |
4850 | } | |
4851 | ||
4852 | /* Similar, but if the returned value is a COMPONENT_REF, return the | |
4853 | FIELD_DECL. */ | |
4854 | ||
4855 | tree | |
4856 | gnat_to_gnu_field_decl (Entity_Id gnat_entity) | |
4857 | { | |
4858 | tree gnu_field = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0); | |
4859 | ||
4860 | if (TREE_CODE (gnu_field) == COMPONENT_REF) | |
4861 | gnu_field = TREE_OPERAND (gnu_field, 1); | |
4862 | ||
4863 | return gnu_field; | |
4864 | } | |
4865 | ||
27dd98d5 | 4866 | /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return |
4867 | the GCC type corresponding to that entity. */ | |
4868 | ||
4869 | tree | |
4870 | gnat_to_gnu_type (Entity_Id gnat_entity) | |
4871 | { | |
4872 | tree gnu_decl; | |
4873 | ||
4874 | /* The back end never attempts to annotate generic types. */ | |
4875 | if (Is_Generic_Type (gnat_entity) && type_annotate_only) | |
4876 | return void_type_node; | |
4877 | ||
4878 | gnu_decl = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0); | |
4879 | gcc_assert (TREE_CODE (gnu_decl) == TYPE_DECL); | |
4880 | ||
4881 | return TREE_TYPE (gnu_decl); | |
4882 | } | |
4883 | ||
4884 | /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return | |
4885 | the unpadded version of the GCC type corresponding to that entity. */ | |
4886 | ||
4887 | tree | |
4888 | get_unpadded_type (Entity_Id gnat_entity) | |
4889 | { | |
4890 | tree type = gnat_to_gnu_type (gnat_entity); | |
4891 | ||
4892 | if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type)) | |
4893 | type = TREE_TYPE (TYPE_FIELDS (type)); | |
4894 | ||
4895 | return type; | |
4896 | } | |
4897 | \f | |
27becfc8 | 4898 | /* Wrap up compilation of DECL, a TYPE_DECL, possibly deferring it. |
4899 | Every TYPE_DECL generated for a type definition must be passed | |
4900 | to this function once everything else has been done for it. */ | |
4901 | ||
4902 | void | |
4903 | rest_of_type_decl_compilation (tree decl) | |
4904 | { | |
4905 | /* We need to defer finalizing the type if incomplete types | |
4906 | are being deferred or if they are being processed. */ | |
4907 | if (defer_incomplete_level || defer_finalize_level) | |
4908 | VEC_safe_push (tree, heap, defer_finalize_list, decl); | |
4909 | else | |
4910 | rest_of_type_decl_compilation_no_defer (decl); | |
4911 | } | |
4912 | ||
4913 | /* Same as above but without deferring the compilation. This | |
4914 | function should not be invoked directly on a TYPE_DECL. */ | |
4915 | ||
4916 | static void | |
4917 | rest_of_type_decl_compilation_no_defer (tree decl) | |
4918 | { | |
4919 | const int toplev = global_bindings_p (); | |
4920 | tree t = TREE_TYPE (decl); | |
4921 | ||
4922 | rest_of_decl_compilation (decl, toplev, 0); | |
4923 | ||
4924 | /* Now process all the variants. This is needed for STABS. */ | |
4925 | for (t = TYPE_MAIN_VARIANT (t); t; t = TYPE_NEXT_VARIANT (t)) | |
4926 | { | |
4927 | if (t == TREE_TYPE (decl)) | |
4928 | continue; | |
4929 | ||
4930 | if (!TYPE_STUB_DECL (t)) | |
515c6c6c | 4931 | TYPE_STUB_DECL (t) = create_type_stub_decl (DECL_NAME (decl), t); |
27becfc8 | 4932 | |
4933 | rest_of_type_compilation (t, toplev); | |
4934 | } | |
4935 | } | |
4936 | ||
4937 | /* Finalize any From_With_Type incomplete types. We do this after processing | |
4938 | our compilation unit and after processing its spec, if this is a body. */ | |
4939 | ||
4940 | void | |
4941 | finalize_from_with_types (void) | |
4942 | { | |
4943 | struct incomplete *incp = defer_limited_with; | |
4944 | struct incomplete *next; | |
4945 | ||
4946 | defer_limited_with = 0; | |
4947 | for (; incp; incp = next) | |
4948 | { | |
4949 | next = incp->next; | |
4950 | ||
4951 | if (incp->old_type != 0) | |
4952 | update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type), | |
4953 | gnat_to_gnu_type (incp->full_type)); | |
4954 | free (incp); | |
4955 | } | |
4956 | } | |
4957 | ||
4958 | /* Return the equivalent type to be used for GNAT_ENTITY, if it's a | |
4959 | kind of type (such E_Task_Type) that has a different type which Gigi | |
4960 | uses for its representation. If the type does not have a special type | |
4961 | for its representation, return GNAT_ENTITY. If a type is supposed to | |
4962 | exist, but does not, abort unless annotating types, in which case | |
4963 | return Empty. If GNAT_ENTITY is Empty, return Empty. */ | |
4964 | ||
4965 | Entity_Id | |
4966 | Gigi_Equivalent_Type (Entity_Id gnat_entity) | |
4967 | { | |
4968 | Entity_Id gnat_equiv = gnat_entity; | |
4969 | ||
4970 | if (No (gnat_entity)) | |
4971 | return gnat_entity; | |
4972 | ||
4973 | switch (Ekind (gnat_entity)) | |
4974 | { | |
4975 | case E_Class_Wide_Subtype: | |
4976 | if (Present (Equivalent_Type (gnat_entity))) | |
4977 | gnat_equiv = Equivalent_Type (gnat_entity); | |
4978 | break; | |
4979 | ||
4980 | case E_Access_Protected_Subprogram_Type: | |
4981 | case E_Anonymous_Access_Protected_Subprogram_Type: | |
4982 | gnat_equiv = Equivalent_Type (gnat_entity); | |
4983 | break; | |
4984 | ||
4985 | case E_Class_Wide_Type: | |
4986 | gnat_equiv = ((Present (Equivalent_Type (gnat_entity))) | |
4987 | ? Equivalent_Type (gnat_entity) | |
4988 | : Root_Type (gnat_entity)); | |
4989 | break; | |
4990 | ||
4991 | case E_Task_Type: | |
4992 | case E_Task_Subtype: | |
4993 | case E_Protected_Type: | |
4994 | case E_Protected_Subtype: | |
4995 | gnat_equiv = Corresponding_Record_Type (gnat_entity); | |
4996 | break; | |
4997 | ||
4998 | default: | |
4999 | break; | |
5000 | } | |
5001 | ||
5002 | gcc_assert (Present (gnat_equiv) || type_annotate_only); | |
5003 | return gnat_equiv; | |
5004 | } | |
5005 | ||
5006 | /* Return a GCC tree for a parameter corresponding to GNAT_PARAM and | |
5007 | using MECH as its passing mechanism, to be placed in the parameter | |
5008 | list built for GNAT_SUBPROG. Assume a foreign convention for the | |
5009 | latter if FOREIGN is true. Also set CICO to true if the parameter | |
5010 | must use the copy-in copy-out implementation mechanism. | |
5011 | ||
5012 | The returned tree is a PARM_DECL, except for those cases where no | |
5013 | parameter needs to be actually passed to the subprogram; the type | |
5014 | of this "shadow" parameter is then returned instead. */ | |
5015 | ||
5016 | static tree | |
5017 | gnat_to_gnu_param (Entity_Id gnat_param, Mechanism_Type mech, | |
5018 | Entity_Id gnat_subprog, bool foreign, bool *cico) | |
5019 | { | |
5020 | tree gnu_param_name = get_entity_name (gnat_param); | |
5021 | tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param)); | |
dc3276a2 | 5022 | tree gnu_param_type_alt = NULL_TREE; |
27becfc8 | 5023 | bool in_param = (Ekind (gnat_param) == E_In_Parameter); |
5024 | /* The parameter can be indirectly modified if its address is taken. */ | |
5025 | bool ro_param = in_param && !Address_Taken (gnat_param); | |
5026 | bool by_return = false, by_component_ptr = false, by_ref = false; | |
5027 | tree gnu_param; | |
5028 | ||
5029 | /* Copy-return is used only for the first parameter of a valued procedure. | |
5030 | It's a copy mechanism for which a parameter is never allocated. */ | |
5031 | if (mech == By_Copy_Return) | |
5032 | { | |
5033 | gcc_assert (Ekind (gnat_param) == E_Out_Parameter); | |
5034 | mech = By_Copy; | |
5035 | by_return = true; | |
5036 | } | |
5037 | ||
5038 | /* If this is either a foreign function or if the underlying type won't | |
5039 | be passed by reference, strip off possible padding type. */ | |
5040 | if (TREE_CODE (gnu_param_type) == RECORD_TYPE | |
5041 | && TYPE_IS_PADDING_P (gnu_param_type)) | |
5042 | { | |
5043 | tree unpadded_type = TREE_TYPE (TYPE_FIELDS (gnu_param_type)); | |
5044 | ||
5045 | if (mech == By_Reference | |
5046 | || foreign | |
5047 | || (!must_pass_by_ref (unpadded_type) | |
5048 | && (mech == By_Copy || !default_pass_by_ref (unpadded_type)))) | |
5049 | gnu_param_type = unpadded_type; | |
5050 | } | |
5051 | ||
5052 | /* If this is a read-only parameter, make a variant of the type that is | |
5053 | read-only. ??? However, if this is an unconstrained array, that type | |
5054 | can be very complex, so skip it for now. Likewise for any other | |
5055 | self-referential type. */ | |
5056 | if (ro_param | |
5057 | && TREE_CODE (gnu_param_type) != UNCONSTRAINED_ARRAY_TYPE | |
5058 | && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_param_type))) | |
5059 | gnu_param_type = build_qualified_type (gnu_param_type, | |
5060 | (TYPE_QUALS (gnu_param_type) | |
5061 | | TYPE_QUAL_CONST)); | |
5062 | ||
5063 | /* For foreign conventions, pass arrays as pointers to the element type. | |
5064 | First check for unconstrained array and get the underlying array. */ | |
5065 | if (foreign && TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE) | |
5066 | gnu_param_type | |
5067 | = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_param_type)))); | |
5068 | ||
a16de24a | 5069 | /* VMS descriptors are themselves passed by reference. */ |
f2e1149c | 5070 | if (mech == By_Short_Descriptor || |
5071 | (mech == By_Descriptor && TARGET_ABI_OPEN_VMS && !TARGET_MALLOC64)) | |
5072 | gnu_param_type | |
5073 | = build_pointer_type (build_vms_descriptor32 (gnu_param_type, | |
5074 | Mechanism (gnat_param), | |
5075 | gnat_subprog)); | |
5076 | else if (mech == By_Descriptor) | |
dc3276a2 | 5077 | { |
a16de24a | 5078 | /* Build both a 32-bit and 64-bit descriptor, one of which will be |
5079 | chosen in fill_vms_descriptor. */ | |
dc3276a2 | 5080 | gnu_param_type_alt |
81dd70cd | 5081 | = build_pointer_type (build_vms_descriptor32 (gnu_param_type, |
dc3276a2 | 5082 | Mechanism (gnat_param), |
5083 | gnat_subprog)); | |
5084 | gnu_param_type | |
5085 | = build_pointer_type (build_vms_descriptor (gnu_param_type, | |
5086 | Mechanism (gnat_param), | |
5087 | gnat_subprog)); | |
5088 | } | |
27becfc8 | 5089 | |
5090 | /* Arrays are passed as pointers to element type for foreign conventions. */ | |
5091 | else if (foreign | |
5092 | && mech != By_Copy | |
5093 | && TREE_CODE (gnu_param_type) == ARRAY_TYPE) | |
5094 | { | |
5095 | /* Strip off any multi-dimensional entries, then strip | |
5096 | off the last array to get the component type. */ | |
5097 | while (TREE_CODE (TREE_TYPE (gnu_param_type)) == ARRAY_TYPE | |
5098 | && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_param_type))) | |
5099 | gnu_param_type = TREE_TYPE (gnu_param_type); | |
5100 | ||
5101 | by_component_ptr = true; | |
5102 | gnu_param_type = TREE_TYPE (gnu_param_type); | |
5103 | ||
5104 | if (ro_param) | |
5105 | gnu_param_type = build_qualified_type (gnu_param_type, | |
5106 | (TYPE_QUALS (gnu_param_type) | |
5107 | | TYPE_QUAL_CONST)); | |
5108 | ||
5109 | gnu_param_type = build_pointer_type (gnu_param_type); | |
5110 | } | |
5111 | ||
5112 | /* Fat pointers are passed as thin pointers for foreign conventions. */ | |
5113 | else if (foreign && TYPE_FAT_POINTER_P (gnu_param_type)) | |
5114 | gnu_param_type | |
5115 | = make_type_from_size (gnu_param_type, size_int (POINTER_SIZE), 0); | |
5116 | ||
5117 | /* If we must pass or were requested to pass by reference, do so. | |
5118 | If we were requested to pass by copy, do so. | |
5119 | Otherwise, for foreign conventions, pass In Out or Out parameters | |
5120 | or aggregates by reference. For COBOL and Fortran, pass all | |
5121 | integer and FP types that way too. For Convention Ada, use | |
5122 | the standard Ada default. */ | |
5123 | else if (must_pass_by_ref (gnu_param_type) | |
5124 | || mech == By_Reference | |
5125 | || (mech != By_Copy | |
5126 | && ((foreign | |
5127 | && (!in_param || AGGREGATE_TYPE_P (gnu_param_type))) | |
5128 | || (foreign | |
5129 | && (Convention (gnat_subprog) == Convention_Fortran | |
5130 | || Convention (gnat_subprog) == Convention_COBOL) | |
5131 | && (INTEGRAL_TYPE_P (gnu_param_type) | |
5132 | || FLOAT_TYPE_P (gnu_param_type))) | |
5133 | || (!foreign | |
5134 | && default_pass_by_ref (gnu_param_type))))) | |
5135 | { | |
5136 | gnu_param_type = build_reference_type (gnu_param_type); | |
5137 | by_ref = true; | |
5138 | } | |
5139 | ||
5140 | /* Pass In Out or Out parameters using copy-in copy-out mechanism. */ | |
5141 | else if (!in_param) | |
5142 | *cico = true; | |
5143 | ||
5144 | if (mech == By_Copy && (by_ref || by_component_ptr)) | |
5145 | post_error ("?cannot pass & by copy", gnat_param); | |
5146 | ||
5147 | /* If this is an Out parameter that isn't passed by reference and isn't | |
5148 | a pointer or aggregate, we don't make a PARM_DECL for it. Instead, | |
5149 | it will be a VAR_DECL created when we process the procedure, so just | |
5150 | return its type. For the special parameter of a valued procedure, | |
5151 | never pass it in. | |
5152 | ||
5153 | An exception is made to cover the RM-6.4.1 rule requiring "by copy" | |
5154 | Out parameters with discriminants or implicit initial values to be | |
5155 | handled like In Out parameters. These type are normally built as | |
5156 | aggregates, hence passed by reference, except for some packed arrays | |
5157 | which end up encoded in special integer types. | |
5158 | ||
5159 | The exception we need to make is then for packed arrays of records | |
5160 | with discriminants or implicit initial values. We have no light/easy | |
5161 | way to check for the latter case, so we merely check for packed arrays | |
5162 | of records. This may lead to useless copy-in operations, but in very | |
5163 | rare cases only, as these would be exceptions in a set of already | |
5164 | exceptional situations. */ | |
5165 | if (Ekind (gnat_param) == E_Out_Parameter | |
5166 | && !by_ref | |
5167 | && (by_return | |
5168 | || (mech != By_Descriptor | |
81dd70cd | 5169 | && mech != By_Short_Descriptor |
27becfc8 | 5170 | && !POINTER_TYPE_P (gnu_param_type) |
5171 | && !AGGREGATE_TYPE_P (gnu_param_type))) | |
5172 | && !(Is_Array_Type (Etype (gnat_param)) | |
5173 | && Is_Packed (Etype (gnat_param)) | |
5174 | && Is_Composite_Type (Component_Type (Etype (gnat_param))))) | |
5175 | return gnu_param_type; | |
5176 | ||
5177 | gnu_param = create_param_decl (gnu_param_name, gnu_param_type, | |
5178 | ro_param || by_ref || by_component_ptr); | |
5179 | DECL_BY_REF_P (gnu_param) = by_ref; | |
5180 | DECL_BY_COMPONENT_PTR_P (gnu_param) = by_component_ptr; | |
81dd70cd | 5181 | DECL_BY_DESCRIPTOR_P (gnu_param) = (mech == By_Descriptor || |
5182 | mech == By_Short_Descriptor); | |
27becfc8 | 5183 | DECL_POINTS_TO_READONLY_P (gnu_param) |
5184 | = (ro_param && (by_ref || by_component_ptr)); | |
5185 | ||
a16de24a | 5186 | /* Save the alternate descriptor type, if any. */ |
5187 | if (gnu_param_type_alt) | |
5188 | SET_DECL_PARM_ALT_TYPE (gnu_param, gnu_param_type_alt); | |
dc3276a2 | 5189 | |
27becfc8 | 5190 | /* If no Mechanism was specified, indicate what we're using, then |
5191 | back-annotate it. */ | |
5192 | if (mech == Default) | |
5193 | mech = (by_ref || by_component_ptr) ? By_Reference : By_Copy; | |
5194 | ||
5195 | Set_Mechanism (gnat_param, mech); | |
5196 | return gnu_param; | |
5197 | } | |
5198 | ||
5199 | /* Return true if DISCR1 and DISCR2 represent the same discriminant. */ | |
5200 | ||
5201 | static bool | |
5202 | same_discriminant_p (Entity_Id discr1, Entity_Id discr2) | |
5203 | { | |
5204 | while (Present (Corresponding_Discriminant (discr1))) | |
5205 | discr1 = Corresponding_Discriminant (discr1); | |
5206 | ||
5207 | while (Present (Corresponding_Discriminant (discr2))) | |
5208 | discr2 = Corresponding_Discriminant (discr2); | |
5209 | ||
5210 | return | |
5211 | Original_Record_Component (discr1) == Original_Record_Component (discr2); | |
5212 | } | |
5213 | ||
5214 | /* Return true if the array type specified by GNAT_TYPE and GNU_TYPE has | |
5215 | a non-aliased component in the back-end sense. */ | |
5216 | ||
5217 | static bool | |
5218 | array_type_has_nonaliased_component (Entity_Id gnat_type, tree gnu_type) | |
5219 | { | |
5220 | /* If the type below this is a multi-array type, then | |
5221 | this does not have aliased components. */ | |
5222 | if (TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE | |
5223 | && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type))) | |
5224 | return true; | |
5225 | ||
5226 | if (Has_Aliased_Components (gnat_type)) | |
5227 | return false; | |
5228 | ||
5229 | return type_for_nonaliased_component_p (TREE_TYPE (gnu_type)); | |
5230 | } | |
27dd98d5 | 5231 | |
5232 | /* Return true if GNAT_ADDRESS is a value known at compile-time. */ | |
5233 | ||
5234 | static bool | |
5235 | compile_time_known_address_p (Node_Id gnat_address) | |
5236 | { | |
5237 | /* Catch System'To_Address. */ | |
5238 | if (Nkind (gnat_address) == N_Unchecked_Type_Conversion) | |
5239 | gnat_address = Expression (gnat_address); | |
5240 | ||
5241 | return Compile_Time_Known_Value (gnat_address); | |
5242 | } | |
27becfc8 | 5243 | \f |
5244 | /* Given GNAT_ENTITY, elaborate all expressions that are required to | |
5245 | be elaborated at the point of its definition, but do nothing else. */ | |
5246 | ||
5247 | void | |
5248 | elaborate_entity (Entity_Id gnat_entity) | |
5249 | { | |
5250 | switch (Ekind (gnat_entity)) | |
5251 | { | |
5252 | case E_Signed_Integer_Subtype: | |
5253 | case E_Modular_Integer_Subtype: | |
5254 | case E_Enumeration_Subtype: | |
5255 | case E_Ordinary_Fixed_Point_Subtype: | |
5256 | case E_Decimal_Fixed_Point_Subtype: | |
5257 | case E_Floating_Point_Subtype: | |
5258 | { | |
5259 | Node_Id gnat_lb = Type_Low_Bound (gnat_entity); | |
5260 | Node_Id gnat_hb = Type_High_Bound (gnat_entity); | |
5261 | ||
211df513 | 5262 | /* ??? Tests to avoid Constraint_Error in static expressions |
5263 | are needed until after the front stops generating bogus | |
5264 | conversions on bounds of real types. */ | |
27becfc8 | 5265 | if (!Raises_Constraint_Error (gnat_lb)) |
5266 | elaborate_expression (gnat_lb, gnat_entity, get_identifier ("L"), | |
dd02c1ab | 5267 | true, false, Needs_Debug_Info (gnat_entity)); |
27becfc8 | 5268 | if (!Raises_Constraint_Error (gnat_hb)) |
5269 | elaborate_expression (gnat_hb, gnat_entity, get_identifier ("U"), | |
dd02c1ab | 5270 | true, false, Needs_Debug_Info (gnat_entity)); |
27becfc8 | 5271 | break; |
5272 | } | |
5273 | ||
5274 | case E_Record_Type: | |
5275 | { | |
5276 | Node_Id full_definition = Declaration_Node (gnat_entity); | |
5277 | Node_Id record_definition = Type_Definition (full_definition); | |
5278 | ||
5279 | /* If this is a record extension, go a level further to find the | |
5280 | record definition. */ | |
5281 | if (Nkind (record_definition) == N_Derived_Type_Definition) | |
5282 | record_definition = Record_Extension_Part (record_definition); | |
5283 | } | |
5284 | break; | |
5285 | ||
5286 | case E_Record_Subtype: | |
5287 | case E_Private_Subtype: | |
5288 | case E_Limited_Private_Subtype: | |
5289 | case E_Record_Subtype_With_Private: | |
5290 | if (Is_Constrained (gnat_entity) | |
5291 | && Has_Discriminants (Base_Type (gnat_entity)) | |
5292 | && Present (Discriminant_Constraint (gnat_entity))) | |
5293 | { | |
5294 | Node_Id gnat_discriminant_expr; | |
5295 | Entity_Id gnat_field; | |
5296 | ||
5297 | for (gnat_field = First_Discriminant (Base_Type (gnat_entity)), | |
5298 | gnat_discriminant_expr | |
5299 | = First_Elmt (Discriminant_Constraint (gnat_entity)); | |
5300 | Present (gnat_field); | |
5301 | gnat_field = Next_Discriminant (gnat_field), | |
5302 | gnat_discriminant_expr = Next_Elmt (gnat_discriminant_expr)) | |
5303 | /* ??? For now, ignore access discriminants. */ | |
5304 | if (!Is_Access_Type (Etype (Node (gnat_discriminant_expr)))) | |
5305 | elaborate_expression (Node (gnat_discriminant_expr), | |
dd02c1ab | 5306 | gnat_entity, get_entity_name (gnat_field), |
5307 | true, false, false); | |
27becfc8 | 5308 | } |
5309 | break; | |
5310 | ||
5311 | } | |
5312 | } | |
5313 | \f | |
5314 | /* Mark GNAT_ENTITY as going out of scope at this point. Recursively mark | |
5315 | any entities on its entity chain similarly. */ | |
5316 | ||
5317 | void | |
5318 | mark_out_of_scope (Entity_Id gnat_entity) | |
5319 | { | |
5320 | Entity_Id gnat_sub_entity; | |
5321 | unsigned int kind = Ekind (gnat_entity); | |
5322 | ||
5323 | /* If this has an entity list, process all in the list. */ | |
5324 | if (IN (kind, Class_Wide_Kind) || IN (kind, Concurrent_Kind) | |
5325 | || IN (kind, Private_Kind) | |
5326 | || kind == E_Block || kind == E_Entry || kind == E_Entry_Family | |
5327 | || kind == E_Function || kind == E_Generic_Function | |
5328 | || kind == E_Generic_Package || kind == E_Generic_Procedure | |
5329 | || kind == E_Loop || kind == E_Operator || kind == E_Package | |
5330 | || kind == E_Package_Body || kind == E_Procedure | |
5331 | || kind == E_Record_Type || kind == E_Record_Subtype | |
5332 | || kind == E_Subprogram_Body || kind == E_Subprogram_Type) | |
5333 | for (gnat_sub_entity = First_Entity (gnat_entity); | |
5334 | Present (gnat_sub_entity); | |
5335 | gnat_sub_entity = Next_Entity (gnat_sub_entity)) | |
5336 | if (Scope (gnat_sub_entity) == gnat_entity | |
5337 | && gnat_sub_entity != gnat_entity) | |
5338 | mark_out_of_scope (gnat_sub_entity); | |
5339 | ||
5340 | /* Now clear this if it has been defined, but only do so if it isn't | |
5341 | a subprogram or parameter. We could refine this, but it isn't | |
5342 | worth it. If this is statically allocated, it is supposed to | |
5343 | hang around out of cope. */ | |
5344 | if (present_gnu_tree (gnat_entity) && !Is_Statically_Allocated (gnat_entity) | |
5345 | && kind != E_Procedure && kind != E_Function && !IN (kind, Formal_Kind)) | |
5346 | { | |
5347 | save_gnu_tree (gnat_entity, NULL_TREE, true); | |
5348 | save_gnu_tree (gnat_entity, error_mark_node, true); | |
5349 | } | |
5350 | } | |
5351 | \f | |
892fdb03 | 5352 | /* Relate the alias sets of GNU_NEW_TYPE and GNU_OLD_TYPE according to OP. |
5353 | If this is a multi-dimensional array type, do this recursively. | |
5354 | ||
5355 | OP may be | |
5356 | - ALIAS_SET_COPY: the new set is made a copy of the old one. | |
5357 | - ALIAS_SET_SUPERSET: the new set is made a superset of the old one. | |
5358 | - ALIAS_SET_SUBSET: the new set is made a subset of the old one. */ | |
27becfc8 | 5359 | |
5360 | static void | |
892fdb03 | 5361 | relate_alias_sets (tree gnu_new_type, tree gnu_old_type, enum alias_set_op op) |
27becfc8 | 5362 | { |
5363 | /* Remove any padding from GNU_OLD_TYPE. It doesn't matter in the case | |
5364 | of a one-dimensional array, since the padding has the same alias set | |
5365 | as the field type, but if it's a multi-dimensional array, we need to | |
5366 | see the inner types. */ | |
5367 | while (TREE_CODE (gnu_old_type) == RECORD_TYPE | |
5368 | && (TYPE_JUSTIFIED_MODULAR_P (gnu_old_type) | |
5369 | || TYPE_IS_PADDING_P (gnu_old_type))) | |
5370 | gnu_old_type = TREE_TYPE (TYPE_FIELDS (gnu_old_type)); | |
5371 | ||
892fdb03 | 5372 | /* Unconstrained array types are deemed incomplete and would thus be given |
5373 | alias set 0. Retrieve the underlying array type. */ | |
27becfc8 | 5374 | if (TREE_CODE (gnu_old_type) == UNCONSTRAINED_ARRAY_TYPE) |
5375 | gnu_old_type | |
5376 | = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_old_type)))); | |
892fdb03 | 5377 | if (TREE_CODE (gnu_new_type) == UNCONSTRAINED_ARRAY_TYPE) |
5378 | gnu_new_type | |
5379 | = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_new_type)))); | |
27becfc8 | 5380 | |
5381 | if (TREE_CODE (gnu_new_type) == ARRAY_TYPE | |
5382 | && TREE_CODE (TREE_TYPE (gnu_new_type)) == ARRAY_TYPE | |
5383 | && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_new_type))) | |
892fdb03 | 5384 | relate_alias_sets (TREE_TYPE (gnu_new_type), TREE_TYPE (gnu_old_type), op); |
27becfc8 | 5385 | |
892fdb03 | 5386 | switch (op) |
5387 | { | |
5388 | case ALIAS_SET_COPY: | |
5389 | /* The alias set shouldn't be copied between array types with different | |
5390 | aliasing settings because this can break the aliasing relationship | |
5391 | between the array type and its element type. */ | |
9c843fa0 | 5392 | #ifndef ENABLE_CHECKING |
892fdb03 | 5393 | if (flag_strict_aliasing) |
9c843fa0 | 5394 | #endif |
892fdb03 | 5395 | gcc_assert (!(TREE_CODE (gnu_new_type) == ARRAY_TYPE |
5396 | && TREE_CODE (gnu_old_type) == ARRAY_TYPE | |
5397 | && TYPE_NONALIASED_COMPONENT (gnu_new_type) | |
5398 | != TYPE_NONALIASED_COMPONENT (gnu_old_type))); | |
5399 | ||
5400 | TYPE_ALIAS_SET (gnu_new_type) = get_alias_set (gnu_old_type); | |
5401 | break; | |
5402 | ||
5403 | case ALIAS_SET_SUBSET: | |
5404 | case ALIAS_SET_SUPERSET: | |
5405 | { | |
5406 | alias_set_type old_set = get_alias_set (gnu_old_type); | |
5407 | alias_set_type new_set = get_alias_set (gnu_new_type); | |
5408 | ||
5409 | /* Do nothing if the alias sets conflict. This ensures that we | |
5410 | never call record_alias_subset several times for the same pair | |
5411 | or at all for alias set 0. */ | |
5412 | if (!alias_sets_conflict_p (old_set, new_set)) | |
5413 | { | |
5414 | if (op == ALIAS_SET_SUBSET) | |
5415 | record_alias_subset (old_set, new_set); | |
5416 | else | |
5417 | record_alias_subset (new_set, old_set); | |
5418 | } | |
5419 | } | |
5420 | break; | |
5421 | ||
5422 | default: | |
5423 | gcc_unreachable (); | |
5424 | } | |
9c843fa0 | 5425 | |
27becfc8 | 5426 | record_component_aliases (gnu_new_type); |
5427 | } | |
5428 | \f | |
5429 | /* Return a TREE_LIST describing the substitutions needed to reflect | |
5430 | discriminant substitutions from GNAT_SUBTYPE to GNAT_TYPE and add | |
5431 | them to GNU_LIST. If GNAT_TYPE is not specified, use the base type | |
ea5ec53d | 5432 | of GNAT_SUBTYPE. The substitutions can be in any order. TREE_PURPOSE |
27becfc8 | 5433 | gives the tree for the discriminant and TREE_VALUES is the replacement |
5434 | value. They are in the form of operands to substitute_in_expr. | |
5435 | DEFINITION is as in gnat_to_gnu_entity. */ | |
5436 | ||
5437 | static tree | |
5438 | substitution_list (Entity_Id gnat_subtype, Entity_Id gnat_type, | |
5439 | tree gnu_list, bool definition) | |
5440 | { | |
5441 | Entity_Id gnat_discrim; | |
5442 | Node_Id gnat_value; | |
5443 | ||
5444 | if (No (gnat_type)) | |
5445 | gnat_type = Implementation_Base_Type (gnat_subtype); | |
5446 | ||
5447 | if (Has_Discriminants (gnat_type)) | |
5448 | for (gnat_discrim = First_Stored_Discriminant (gnat_type), | |
5449 | gnat_value = First_Elmt (Stored_Constraint (gnat_subtype)); | |
5450 | Present (gnat_discrim); | |
5451 | gnat_discrim = Next_Stored_Discriminant (gnat_discrim), | |
5452 | gnat_value = Next_Elmt (gnat_value)) | |
5453 | /* Ignore access discriminants. */ | |
5454 | if (!Is_Access_Type (Etype (Node (gnat_value)))) | |
5455 | gnu_list = tree_cons (gnat_to_gnu_field_decl (gnat_discrim), | |
5456 | elaborate_expression | |
5457 | (Node (gnat_value), gnat_subtype, | |
5458 | get_entity_name (gnat_discrim), definition, | |
dd02c1ab | 5459 | true, false), |
27becfc8 | 5460 | gnu_list); |
5461 | ||
5462 | return gnu_list; | |
5463 | } | |
5464 | \f | |
5465 | /* Return true if the size represented by GNU_SIZE can be handled by an | |
5466 | allocation. If STATIC_P is true, consider only what can be done with a | |
5467 | static allocation. */ | |
5468 | ||
5469 | static bool | |
5470 | allocatable_size_p (tree gnu_size, bool static_p) | |
5471 | { | |
5472 | HOST_WIDE_INT our_size; | |
5473 | ||
5474 | /* If this is not a static allocation, the only case we want to forbid | |
5475 | is an overflowing size. That will be converted into a raise a | |
5476 | Storage_Error. */ | |
5477 | if (!static_p) | |
5478 | return !(TREE_CODE (gnu_size) == INTEGER_CST | |
5479 | && TREE_OVERFLOW (gnu_size)); | |
5480 | ||
5481 | /* Otherwise, we need to deal with both variable sizes and constant | |
5482 | sizes that won't fit in a host int. We use int instead of HOST_WIDE_INT | |
5483 | since assemblers may not like very large sizes. */ | |
5484 | if (!host_integerp (gnu_size, 1)) | |
5485 | return false; | |
5486 | ||
5487 | our_size = tree_low_cst (gnu_size, 1); | |
5488 | return (int) our_size == our_size; | |
5489 | } | |
5490 | \f | |
5491 | /* Prepend to ATTR_LIST an entry for an attribute with provided TYPE, | |
5492 | NAME, ARGS and ERROR_POINT. */ | |
5493 | ||
5494 | static void | |
5495 | prepend_one_attribute_to (struct attrib ** attr_list, | |
5496 | enum attr_type attr_type, | |
5497 | tree attr_name, | |
5498 | tree attr_args, | |
5499 | Node_Id attr_error_point) | |
5500 | { | |
5501 | struct attrib * attr = (struct attrib *) xmalloc (sizeof (struct attrib)); | |
5502 | ||
5503 | attr->type = attr_type; | |
5504 | attr->name = attr_name; | |
5505 | attr->args = attr_args; | |
5506 | attr->error_point = attr_error_point; | |
5507 | ||
5508 | attr->next = *attr_list; | |
5509 | *attr_list = attr; | |
5510 | } | |
5511 | ||
5512 | /* Prepend to ATTR_LIST the list of attributes for GNAT_ENTITY, if any. */ | |
5513 | ||
5514 | static void | |
5515 | prepend_attributes (Entity_Id gnat_entity, struct attrib ** attr_list) | |
5516 | { | |
5517 | Node_Id gnat_temp; | |
5518 | ||
5519 | for (gnat_temp = First_Rep_Item (gnat_entity); Present (gnat_temp); | |
5520 | gnat_temp = Next_Rep_Item (gnat_temp)) | |
5521 | if (Nkind (gnat_temp) == N_Pragma) | |
5522 | { | |
5523 | tree gnu_arg0 = NULL_TREE, gnu_arg1 = NULL_TREE; | |
5524 | Node_Id gnat_assoc = Pragma_Argument_Associations (gnat_temp); | |
5525 | enum attr_type etype; | |
5526 | ||
5527 | if (Present (gnat_assoc) && Present (First (gnat_assoc)) | |
5528 | && Present (Next (First (gnat_assoc))) | |
5529 | && (Nkind (Expression (Next (First (gnat_assoc)))) | |
5530 | == N_String_Literal)) | |
5531 | { | |
5532 | gnu_arg0 = get_identifier (TREE_STRING_POINTER | |
5533 | (gnat_to_gnu | |
5534 | (Expression (Next | |
5535 | (First (gnat_assoc)))))); | |
5536 | if (Present (Next (Next (First (gnat_assoc)))) | |
5537 | && (Nkind (Expression (Next (Next (First (gnat_assoc))))) | |
5538 | == N_String_Literal)) | |
5539 | gnu_arg1 = get_identifier (TREE_STRING_POINTER | |
5540 | (gnat_to_gnu | |
5541 | (Expression | |
5542 | (Next (Next | |
5543 | (First (gnat_assoc))))))); | |
5544 | } | |
5545 | ||
5546 | switch (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_temp)))) | |
5547 | { | |
5548 | case Pragma_Machine_Attribute: | |
5549 | etype = ATTR_MACHINE_ATTRIBUTE; | |
5550 | break; | |
5551 | ||
5552 | case Pragma_Linker_Alias: | |
5553 | etype = ATTR_LINK_ALIAS; | |
5554 | break; | |
5555 | ||
5556 | case Pragma_Linker_Section: | |
5557 | etype = ATTR_LINK_SECTION; | |
5558 | break; | |
5559 | ||
5560 | case Pragma_Linker_Constructor: | |
5561 | etype = ATTR_LINK_CONSTRUCTOR; | |
5562 | break; | |
5563 | ||
5564 | case Pragma_Linker_Destructor: | |
5565 | etype = ATTR_LINK_DESTRUCTOR; | |
5566 | break; | |
5567 | ||
5568 | case Pragma_Weak_External: | |
5569 | etype = ATTR_WEAK_EXTERNAL; | |
5570 | break; | |
5571 | ||
90d3e56e | 5572 | case Pragma_Thread_Local_Storage: |
5573 | etype = ATTR_THREAD_LOCAL_STORAGE; | |
5574 | break; | |
5575 | ||
27becfc8 | 5576 | default: |
5577 | continue; | |
5578 | } | |
5579 | ||
5580 | ||
5581 | /* Prepend to the list now. Make a list of the argument we might | |
5582 | have, as GCC expects it. */ | |
5583 | prepend_one_attribute_to | |
5584 | (attr_list, | |
5585 | etype, gnu_arg0, | |
5586 | (gnu_arg1 != NULL_TREE) | |
5587 | ? build_tree_list (NULL_TREE, gnu_arg1) : NULL_TREE, | |
5588 | Present (Next (First (gnat_assoc))) | |
5589 | ? Expression (Next (First (gnat_assoc))) : gnat_temp); | |
5590 | } | |
5591 | } | |
5592 | \f | |
dd02c1ab | 5593 | /* Called when we need to protect a variable object using a SAVE_EXPR. */ |
27becfc8 | 5594 | |
5595 | tree | |
5596 | maybe_variable (tree gnu_operand) | |
5597 | { | |
dd02c1ab | 5598 | if (TREE_CONSTANT (gnu_operand) |
5599 | || TREE_READONLY (gnu_operand) | |
27becfc8 | 5600 | || TREE_CODE (gnu_operand) == SAVE_EXPR |
5601 | || TREE_CODE (gnu_operand) == NULL_EXPR) | |
5602 | return gnu_operand; | |
5603 | ||
5604 | if (TREE_CODE (gnu_operand) == UNCONSTRAINED_ARRAY_REF) | |
5605 | { | |
dd02c1ab | 5606 | tree gnu_result |
5607 | = build1 (UNCONSTRAINED_ARRAY_REF, TREE_TYPE (gnu_operand), | |
5608 | variable_size (TREE_OPERAND (gnu_operand, 0))); | |
27becfc8 | 5609 | |
5610 | TREE_READONLY (gnu_result) = TREE_STATIC (gnu_result) | |
5611 | = TYPE_READONLY (TREE_TYPE (TREE_TYPE (gnu_operand))); | |
5612 | return gnu_result; | |
5613 | } | |
dd02c1ab | 5614 | |
5615 | return variable_size (gnu_operand); | |
27becfc8 | 5616 | } |
5617 | \f | |
5618 | /* Given a GNAT tree GNAT_EXPR, for an expression which is a value within a | |
5619 | type definition (either a bound or a discriminant value) for GNAT_ENTITY, | |
dd02c1ab | 5620 | return the GCC tree to use for that expression. GNU_NAME is the suffix |
5621 | to use if a variable needs to be created and DEFINITION is true if this | |
5622 | is a definition of GNAT_ENTITY. If NEED_VALUE is true, we need a result; | |
5623 | otherwise, we are just elaborating the expression for side-effects. If | |
5624 | NEED_DEBUG is true, we need a variable for debugging purposes even if it | |
32826d65 | 5625 | isn't needed for code generation. */ |
27becfc8 | 5626 | |
5627 | static tree | |
dd02c1ab | 5628 | elaborate_expression (Node_Id gnat_expr, Entity_Id gnat_entity, tree gnu_name, |
5629 | bool definition, bool need_value, bool need_debug) | |
27becfc8 | 5630 | { |
5631 | tree gnu_expr; | |
5632 | ||
dd02c1ab | 5633 | /* If we already elaborated this expression (e.g. it was involved |
27becfc8 | 5634 | in the definition of a private type), use the old value. */ |
5635 | if (present_gnu_tree (gnat_expr)) | |
5636 | return get_gnu_tree (gnat_expr); | |
5637 | ||
dd02c1ab | 5638 | /* If we don't need a value and this is static or a discriminant, |
5639 | we don't need to do anything. */ | |
5640 | if (!need_value | |
5641 | && (Is_OK_Static_Expression (gnat_expr) | |
5642 | || (Nkind (gnat_expr) == N_Identifier | |
5643 | && Ekind (Entity (gnat_expr)) == E_Discriminant))) | |
5644 | return NULL_TREE; | |
5645 | ||
5646 | /* If it's a static expression, we don't need a variable for debugging. */ | |
5647 | if (need_debug && Is_OK_Static_Expression (gnat_expr)) | |
5648 | need_debug = false; | |
27becfc8 | 5649 | |
dd02c1ab | 5650 | /* Otherwise, convert this tree to its GCC equivalent and elaborate it. */ |
5651 | gnu_expr = elaborate_expression_1 (gnat_to_gnu (gnat_expr), gnat_entity, | |
5652 | gnu_name, definition, need_debug); | |
27becfc8 | 5653 | |
5654 | /* Save the expression in case we try to elaborate this entity again. Since | |
ea5ec53d | 5655 | it's not a DECL, don't check it. Don't save if it's a discriminant. */ |
27becfc8 | 5656 | if (!CONTAINS_PLACEHOLDER_P (gnu_expr)) |
5657 | save_gnu_tree (gnat_expr, gnu_expr, true); | |
5658 | ||
5659 | return need_value ? gnu_expr : error_mark_node; | |
5660 | } | |
5661 | ||
dd02c1ab | 5662 | /* Similar, but take a GNU expression and always return a result. */ |
27becfc8 | 5663 | |
5664 | static tree | |
dd02c1ab | 5665 | elaborate_expression_1 (tree gnu_expr, Entity_Id gnat_entity, tree gnu_name, |
5666 | bool definition, bool need_debug) | |
27becfc8 | 5667 | { |
27becfc8 | 5668 | /* Skip any conversions and simple arithmetics to see if the expression |
5669 | is a read-only variable. | |
5670 | ??? This really should remain read-only, but we have to think about | |
5671 | the typing of the tree here. */ | |
5672 | tree gnu_inner_expr | |
5673 | = skip_simple_arithmetic (remove_conversions (gnu_expr, true)); | |
dd02c1ab | 5674 | tree gnu_decl = NULL_TREE; |
27becfc8 | 5675 | bool expr_global = Is_Public (gnat_entity) || global_bindings_p (); |
5676 | bool expr_variable; | |
5677 | ||
dd02c1ab | 5678 | /* In most cases, we won't see a naked FIELD_DECL because a discriminant |
5679 | reference will have been replaced with a COMPONENT_REF when the type | |
5680 | is being elaborated. However, there are some cases involving child | |
5681 | types where we will. So convert it to a COMPONENT_REF. We hope it | |
5682 | will be at the highest level of the expression in these cases. */ | |
27becfc8 | 5683 | if (TREE_CODE (gnu_expr) == FIELD_DECL) |
5684 | gnu_expr = build3 (COMPONENT_REF, TREE_TYPE (gnu_expr), | |
5685 | build0 (PLACEHOLDER_EXPR, DECL_CONTEXT (gnu_expr)), | |
5686 | gnu_expr, NULL_TREE); | |
5687 | ||
5688 | /* If GNU_EXPR is neither a placeholder nor a constant, nor a variable | |
5689 | that is read-only, make a variable that is initialized to contain the | |
5690 | bound when the package containing the definition is elaborated. If | |
5691 | this entity is defined at top level and a bound or discriminant value | |
5692 | isn't a constant or a reference to a discriminant, replace the bound | |
5693 | by the variable; otherwise use a SAVE_EXPR if needed. Note that we | |
5694 | rely here on the fact that an expression cannot contain both the | |
5695 | discriminant and some other variable. */ | |
27becfc8 | 5696 | expr_variable = (!CONSTANT_CLASS_P (gnu_expr) |
5697 | && !(TREE_CODE (gnu_inner_expr) == VAR_DECL | |
5698 | && (TREE_READONLY (gnu_inner_expr) | |
5699 | || DECL_READONLY_ONCE_ELAB (gnu_inner_expr))) | |
5700 | && !CONTAINS_PLACEHOLDER_P (gnu_expr)); | |
5701 | ||
dd02c1ab | 5702 | /* If GNU_EXPR contains a discriminant, we can't elaborate a variable. */ |
5703 | if (need_debug && CONTAINS_PLACEHOLDER_P (gnu_expr)) | |
27becfc8 | 5704 | need_debug = false; |
5705 | ||
5706 | /* Now create the variable if we need it. */ | |
5707 | if (need_debug || (expr_variable && expr_global)) | |
5708 | gnu_decl | |
5709 | = create_var_decl (create_concat_name (gnat_entity, | |
5710 | IDENTIFIER_POINTER (gnu_name)), | |
5711 | NULL_TREE, TREE_TYPE (gnu_expr), gnu_expr, | |
5712 | !need_debug, Is_Public (gnat_entity), | |
5713 | !definition, false, NULL, gnat_entity); | |
5714 | ||
5715 | /* We only need to use this variable if we are in global context since GCC | |
5716 | can do the right thing in the local case. */ | |
5717 | if (expr_global && expr_variable) | |
5718 | return gnu_decl; | |
dd02c1ab | 5719 | |
5720 | return expr_variable ? maybe_variable (gnu_expr) : gnu_expr; | |
27becfc8 | 5721 | } |
5722 | \f | |
5723 | /* Create a record type that contains a SIZE bytes long field of TYPE with a | |
5724 | starting bit position so that it is aligned to ALIGN bits, and leaving at | |
5725 | least ROOM bytes free before the field. BASE_ALIGN is the alignment the | |
5726 | record is guaranteed to get. */ | |
5727 | ||
5728 | tree | |
5729 | make_aligning_type (tree type, unsigned int align, tree size, | |
5730 | unsigned int base_align, int room) | |
5731 | { | |
5732 | /* We will be crafting a record type with one field at a position set to be | |
5733 | the next multiple of ALIGN past record'address + room bytes. We use a | |
5734 | record placeholder to express record'address. */ | |
5735 | ||
5736 | tree record_type = make_node (RECORD_TYPE); | |
5737 | tree record = build0 (PLACEHOLDER_EXPR, record_type); | |
5738 | ||
5739 | tree record_addr_st | |
5740 | = convert (sizetype, build_unary_op (ADDR_EXPR, NULL_TREE, record)); | |
5741 | ||
5742 | /* The diagram below summarizes the shape of what we manipulate: | |
5743 | ||
5744 | <--------- pos ----------> | |
5745 | { +------------+-------------+-----------------+ | |
5746 | record =>{ |############| ... | field (type) | | |
5747 | { +------------+-------------+-----------------+ | |
5748 | |<-- room -->|<- voffset ->|<---- size ----->| | |
5749 | o o | |
5750 | | | | |
5751 | record_addr vblock_addr | |
5752 | ||
5753 | Every length is in sizetype bytes there, except "pos" which has to be | |
5754 | set as a bit position in the GCC tree for the record. */ | |
5755 | ||
5756 | tree room_st = size_int (room); | |
5757 | tree vblock_addr_st = size_binop (PLUS_EXPR, record_addr_st, room_st); | |
5758 | tree voffset_st, pos, field; | |
5759 | ||
5760 | tree name = TYPE_NAME (type); | |
5761 | ||
5762 | if (TREE_CODE (name) == TYPE_DECL) | |
5763 | name = DECL_NAME (name); | |
5764 | ||
e3698827 | 5765 | TYPE_NAME (record_type) = concat_name (name, "_ALIGN"); |
27becfc8 | 5766 | |
5767 | /* Compute VOFFSET and then POS. The next byte position multiple of some | |
5768 | alignment after some address is obtained by "and"ing the alignment minus | |
5769 | 1 with the two's complement of the address. */ | |
5770 | ||
5771 | voffset_st = size_binop (BIT_AND_EXPR, | |
5772 | size_diffop (size_zero_node, vblock_addr_st), | |
5773 | ssize_int ((align / BITS_PER_UNIT) - 1)); | |
5774 | ||
5775 | /* POS = (ROOM + VOFFSET) * BIT_PER_UNIT, in bitsizetype. */ | |
5776 | ||
5777 | pos = size_binop (MULT_EXPR, | |
5778 | convert (bitsizetype, | |
5779 | size_binop (PLUS_EXPR, room_st, voffset_st)), | |
5780 | bitsize_unit_node); | |
5781 | ||
5782 | /* Craft the GCC record representation. We exceptionally do everything | |
5783 | manually here because 1) our generic circuitry is not quite ready to | |
5784 | handle the complex position/size expressions we are setting up, 2) we | |
5785 | have a strong simplifying factor at hand: we know the maximum possible | |
5786 | value of voffset, and 3) we have to set/reset at least the sizes in | |
5787 | accordance with this maximum value anyway, as we need them to convey | |
5788 | what should be "alloc"ated for this type. | |
5789 | ||
5790 | Use -1 as the 'addressable' indication for the field to prevent the | |
5791 | creation of a bitfield. We don't need one, it would have damaging | |
5792 | consequences on the alignment computation, and create_field_decl would | |
5793 | make one without this special argument, for instance because of the | |
5794 | complex position expression. */ | |
5795 | ||
5796 | field = create_field_decl (get_identifier ("F"), type, record_type, | |
5797 | 1, size, pos, -1); | |
5798 | TYPE_FIELDS (record_type) = field; | |
5799 | ||
5800 | TYPE_ALIGN (record_type) = base_align; | |
5801 | TYPE_USER_ALIGN (record_type) = 1; | |
5802 | ||
5803 | TYPE_SIZE (record_type) | |
5804 | = size_binop (PLUS_EXPR, | |
5805 | size_binop (MULT_EXPR, convert (bitsizetype, size), | |
5806 | bitsize_unit_node), | |
5807 | bitsize_int (align + room * BITS_PER_UNIT)); | |
5808 | TYPE_SIZE_UNIT (record_type) | |
5809 | = size_binop (PLUS_EXPR, size, | |
5810 | size_int (room + align / BITS_PER_UNIT)); | |
5811 | ||
3a2a1581 | 5812 | SET_TYPE_MODE (record_type, BLKmode); |
27becfc8 | 5813 | |
892fdb03 | 5814 | relate_alias_sets (record_type, type, ALIAS_SET_COPY); |
27becfc8 | 5815 | return record_type; |
5816 | } | |
5817 | \f | |
5818 | /* Return the result of rounding T up to ALIGN. */ | |
5819 | ||
5820 | static inline unsigned HOST_WIDE_INT | |
5821 | round_up_to_align (unsigned HOST_WIDE_INT t, unsigned int align) | |
5822 | { | |
5823 | t += align - 1; | |
5824 | t /= align; | |
5825 | t *= align; | |
5826 | return t; | |
5827 | } | |
5828 | ||
5829 | /* TYPE is a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE that is being used | |
5830 | as the field type of a packed record if IN_RECORD is true, or as the | |
5831 | component type of a packed array if IN_RECORD is false. See if we can | |
5832 | rewrite it either as a type that has a non-BLKmode, which we can pack | |
f6b2b596 | 5833 | tighter in the packed record case, or as a smaller type. If so, return |
5834 | the new type. If not, return the original type. */ | |
27becfc8 | 5835 | |
5836 | static tree | |
5837 | make_packable_type (tree type, bool in_record) | |
5838 | { | |
5839 | unsigned HOST_WIDE_INT size = tree_low_cst (TYPE_SIZE (type), 1); | |
5840 | unsigned HOST_WIDE_INT new_size; | |
5841 | tree new_type, old_field, field_list = NULL_TREE; | |
5842 | ||
5843 | /* No point in doing anything if the size is zero. */ | |
5844 | if (size == 0) | |
5845 | return type; | |
5846 | ||
5847 | new_type = make_node (TREE_CODE (type)); | |
5848 | ||
5849 | /* Copy the name and flags from the old type to that of the new. | |
5850 | Note that we rely on the pointer equality created here for | |
5851 | TYPE_NAME to look through conversions in various places. */ | |
5852 | TYPE_NAME (new_type) = TYPE_NAME (type); | |
5853 | TYPE_JUSTIFIED_MODULAR_P (new_type) = TYPE_JUSTIFIED_MODULAR_P (type); | |
5854 | TYPE_CONTAINS_TEMPLATE_P (new_type) = TYPE_CONTAINS_TEMPLATE_P (type); | |
5855 | if (TREE_CODE (type) == RECORD_TYPE) | |
5856 | TYPE_IS_PADDING_P (new_type) = TYPE_IS_PADDING_P (type); | |
5857 | ||
5858 | /* If we are in a record and have a small size, set the alignment to | |
5859 | try for an integral mode. Otherwise set it to try for a smaller | |
5860 | type with BLKmode. */ | |
5861 | if (in_record && size <= MAX_FIXED_MODE_SIZE) | |
5862 | { | |
5863 | TYPE_ALIGN (new_type) = ceil_alignment (size); | |
5864 | new_size = round_up_to_align (size, TYPE_ALIGN (new_type)); | |
5865 | } | |
5866 | else | |
5867 | { | |
5868 | unsigned HOST_WIDE_INT align; | |
5869 | ||
5870 | /* Do not try to shrink the size if the RM size is not constant. */ | |
5871 | if (TYPE_CONTAINS_TEMPLATE_P (type) | |
5872 | || !host_integerp (TYPE_ADA_SIZE (type), 1)) | |
5873 | return type; | |
5874 | ||
5875 | /* Round the RM size up to a unit boundary to get the minimal size | |
5876 | for a BLKmode record. Give up if it's already the size. */ | |
5877 | new_size = TREE_INT_CST_LOW (TYPE_ADA_SIZE (type)); | |
5878 | new_size = round_up_to_align (new_size, BITS_PER_UNIT); | |
5879 | if (new_size == size) | |
5880 | return type; | |
5881 | ||
5882 | align = new_size & -new_size; | |
5883 | TYPE_ALIGN (new_type) = MIN (TYPE_ALIGN (type), align); | |
5884 | } | |
5885 | ||
5886 | TYPE_USER_ALIGN (new_type) = 1; | |
5887 | ||
5888 | /* Now copy the fields, keeping the position and size as we don't want | |
5889 | to change the layout by propagating the packedness downwards. */ | |
5890 | for (old_field = TYPE_FIELDS (type); old_field; | |
5891 | old_field = TREE_CHAIN (old_field)) | |
5892 | { | |
5893 | tree new_field_type = TREE_TYPE (old_field); | |
5894 | tree new_field, new_size; | |
5895 | ||
f6b2b596 | 5896 | if ((TREE_CODE (new_field_type) == RECORD_TYPE |
5897 | || TREE_CODE (new_field_type) == UNION_TYPE | |
5898 | || TREE_CODE (new_field_type) == QUAL_UNION_TYPE) | |
5899 | && !TYPE_IS_FAT_POINTER_P (new_field_type) | |
27becfc8 | 5900 | && host_integerp (TYPE_SIZE (new_field_type), 1)) |
5901 | new_field_type = make_packable_type (new_field_type, true); | |
5902 | ||
5903 | /* However, for the last field in a not already packed record type | |
153edb51 | 5904 | that is of an aggregate type, we need to use the RM size in the |
27becfc8 | 5905 | packable version of the record type, see finish_record_type. */ |
5906 | if (!TREE_CHAIN (old_field) | |
5907 | && !TYPE_PACKED (type) | |
5908 | && (TREE_CODE (new_field_type) == RECORD_TYPE | |
5909 | || TREE_CODE (new_field_type) == UNION_TYPE | |
5910 | || TREE_CODE (new_field_type) == QUAL_UNION_TYPE) | |
5911 | && !TYPE_IS_FAT_POINTER_P (new_field_type) | |
5912 | && !TYPE_CONTAINS_TEMPLATE_P (new_field_type) | |
5913 | && TYPE_ADA_SIZE (new_field_type)) | |
5914 | new_size = TYPE_ADA_SIZE (new_field_type); | |
5915 | else | |
5916 | new_size = DECL_SIZE (old_field); | |
5917 | ||
5918 | new_field = create_field_decl (DECL_NAME (old_field), new_field_type, | |
5919 | new_type, TYPE_PACKED (type), new_size, | |
5920 | bit_position (old_field), | |
5921 | !DECL_NONADDRESSABLE_P (old_field)); | |
5922 | ||
5923 | DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field); | |
5924 | SET_DECL_ORIGINAL_FIELD | |
5925 | (new_field, (DECL_ORIGINAL_FIELD (old_field) | |
5926 | ? DECL_ORIGINAL_FIELD (old_field) : old_field)); | |
5927 | ||
5928 | if (TREE_CODE (new_type) == QUAL_UNION_TYPE) | |
5929 | DECL_QUALIFIER (new_field) = DECL_QUALIFIER (old_field); | |
5930 | ||
5931 | TREE_CHAIN (new_field) = field_list; | |
5932 | field_list = new_field; | |
5933 | } | |
5934 | ||
5935 | finish_record_type (new_type, nreverse (field_list), 2, true); | |
892fdb03 | 5936 | relate_alias_sets (new_type, type, ALIAS_SET_COPY); |
27becfc8 | 5937 | |
5938 | /* If this is a padding record, we never want to make the size smaller | |
5939 | than what was specified. For QUAL_UNION_TYPE, also copy the size. */ | |
5940 | if ((TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type)) | |
5941 | || TREE_CODE (type) == QUAL_UNION_TYPE) | |
5942 | { | |
5943 | TYPE_SIZE (new_type) = TYPE_SIZE (type); | |
5944 | TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (type); | |
5945 | } | |
5946 | else | |
5947 | { | |
5948 | TYPE_SIZE (new_type) = bitsize_int (new_size); | |
5949 | TYPE_SIZE_UNIT (new_type) | |
5950 | = size_int ((new_size + BITS_PER_UNIT - 1) / BITS_PER_UNIT); | |
5951 | } | |
5952 | ||
5953 | if (!TYPE_CONTAINS_TEMPLATE_P (type)) | |
5954 | SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (type)); | |
5955 | ||
5956 | compute_record_mode (new_type); | |
5957 | ||
5958 | /* Try harder to get a packable type if necessary, for example | |
5959 | in case the record itself contains a BLKmode field. */ | |
5960 | if (in_record && TYPE_MODE (new_type) == BLKmode) | |
3a2a1581 | 5961 | SET_TYPE_MODE (new_type, |
5962 | mode_for_size_tree (TYPE_SIZE (new_type), MODE_INT, 1)); | |
27becfc8 | 5963 | |
5964 | /* If neither the mode nor the size has shrunk, return the old type. */ | |
5965 | if (TYPE_MODE (new_type) == BLKmode && new_size >= size) | |
5966 | return type; | |
5967 | ||
5968 | return new_type; | |
5969 | } | |
5970 | \f | |
5971 | /* Ensure that TYPE has SIZE and ALIGN. Make and return a new padded type | |
5972 | if needed. We have already verified that SIZE and TYPE are large enough. | |
5973 | ||
5974 | GNAT_ENTITY and NAME_TRAILER are used to name the resulting record and | |
5975 | to issue a warning. | |
5976 | ||
5977 | IS_USER_TYPE is true if we must complete the original type. | |
5978 | ||
5979 | DEFINITION is true if this type is being defined. | |
5980 | ||
153edb51 | 5981 | SAME_RM_SIZE is true if the RM size of the resulting type is to be set |
5982 | to SIZE too; otherwise, it's set to the RM size of the original type. */ | |
27becfc8 | 5983 | |
5984 | tree | |
5985 | maybe_pad_type (tree type, tree size, unsigned int align, | |
5986 | Entity_Id gnat_entity, const char *name_trailer, | |
5987 | bool is_user_type, bool definition, bool same_rm_size) | |
5988 | { | |
5989 | tree orig_rm_size = same_rm_size ? NULL_TREE : rm_size (type); | |
5990 | tree orig_size = TYPE_SIZE (type); | |
5991 | unsigned int orig_align = align; | |
5992 | tree record, field; | |
5993 | ||
5994 | /* If TYPE is a padded type, see if it agrees with any size and alignment | |
5995 | we were given. If so, return the original type. Otherwise, strip | |
5996 | off the padding, since we will either be returning the inner type | |
5997 | or repadding it. If no size or alignment is specified, use that of | |
5998 | the original padded type. */ | |
5999 | if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type)) | |
6000 | { | |
6001 | if ((!size | |
6002 | || operand_equal_p (round_up (size, | |
6003 | MAX (align, TYPE_ALIGN (type))), | |
6004 | round_up (TYPE_SIZE (type), | |
6005 | MAX (align, TYPE_ALIGN (type))), | |
6006 | 0)) | |
6007 | && (align == 0 || align == TYPE_ALIGN (type))) | |
6008 | return type; | |
6009 | ||
6010 | if (!size) | |
6011 | size = TYPE_SIZE (type); | |
6012 | if (align == 0) | |
6013 | align = TYPE_ALIGN (type); | |
6014 | ||
6015 | type = TREE_TYPE (TYPE_FIELDS (type)); | |
6016 | orig_size = TYPE_SIZE (type); | |
6017 | } | |
6018 | ||
6019 | /* If the size is either not being changed or is being made smaller (which | |
690b2030 | 6020 | is not done here and is only valid for bitfields anyway), show the size |
27becfc8 | 6021 | isn't changing. Likewise, clear the alignment if it isn't being |
6022 | changed. Then return if we aren't doing anything. */ | |
6023 | if (size | |
6024 | && (operand_equal_p (size, orig_size, 0) | |
6025 | || (TREE_CODE (orig_size) == INTEGER_CST | |
6026 | && tree_int_cst_lt (size, orig_size)))) | |
6027 | size = NULL_TREE; | |
6028 | ||
6029 | if (align == TYPE_ALIGN (type)) | |
6030 | align = 0; | |
6031 | ||
6032 | if (align == 0 && !size) | |
6033 | return type; | |
6034 | ||
6035 | /* If requested, complete the original type and give it a name. */ | |
6036 | if (is_user_type) | |
6037 | create_type_decl (get_entity_name (gnat_entity), type, | |
6038 | NULL, !Comes_From_Source (gnat_entity), | |
6039 | !(TYPE_NAME (type) | |
6040 | && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL | |
6041 | && DECL_IGNORED_P (TYPE_NAME (type))), | |
6042 | gnat_entity); | |
6043 | ||
6044 | /* We used to modify the record in place in some cases, but that could | |
6045 | generate incorrect debugging information. So make a new record | |
6046 | type and name. */ | |
6047 | record = make_node (RECORD_TYPE); | |
6048 | TYPE_IS_PADDING_P (record) = 1; | |
6049 | ||
6050 | if (Present (gnat_entity)) | |
6051 | TYPE_NAME (record) = create_concat_name (gnat_entity, name_trailer); | |
6052 | ||
6053 | TYPE_VOLATILE (record) | |
6054 | = Present (gnat_entity) && Treat_As_Volatile (gnat_entity); | |
6055 | ||
6056 | TYPE_ALIGN (record) = align; | |
6057 | if (orig_align) | |
6058 | TYPE_USER_ALIGN (record) = align; | |
6059 | ||
6060 | TYPE_SIZE (record) = size ? size : orig_size; | |
6061 | TYPE_SIZE_UNIT (record) | |
6062 | = convert (sizetype, | |
6063 | size_binop (CEIL_DIV_EXPR, TYPE_SIZE (record), | |
6064 | bitsize_unit_node)); | |
6065 | ||
6066 | /* If we are changing the alignment and the input type is a record with | |
6067 | BLKmode and a small constant size, try to make a form that has an | |
6068 | integral mode. This might allow the padding record to also have an | |
6069 | integral mode, which will be much more efficient. There is no point | |
6070 | in doing so if a size is specified unless it is also a small constant | |
6071 | size and it is incorrect to do so if we cannot guarantee that the mode | |
6072 | will be naturally aligned since the field must always be addressable. | |
6073 | ||
6074 | ??? This might not always be a win when done for a stand-alone object: | |
6075 | since the nominal and the effective type of the object will now have | |
6076 | different modes, a VIEW_CONVERT_EXPR will be required for converting | |
6077 | between them and it might be hard to overcome afterwards, including | |
6078 | at the RTL level when the stand-alone object is accessed as a whole. */ | |
6079 | if (align != 0 | |
6080 | && TREE_CODE (type) == RECORD_TYPE | |
6081 | && TYPE_MODE (type) == BLKmode | |
6082 | && TREE_CODE (orig_size) == INTEGER_CST | |
be763a3f | 6083 | && !TREE_OVERFLOW (orig_size) |
27becfc8 | 6084 | && compare_tree_int (orig_size, MAX_FIXED_MODE_SIZE) <= 0 |
6085 | && (!size | |
6086 | || (TREE_CODE (size) == INTEGER_CST | |
6087 | && compare_tree_int (size, MAX_FIXED_MODE_SIZE) <= 0))) | |
6088 | { | |
6089 | tree packable_type = make_packable_type (type, true); | |
6090 | if (TYPE_MODE (packable_type) != BLKmode | |
6091 | && align >= TYPE_ALIGN (packable_type)) | |
6092 | type = packable_type; | |
6093 | } | |
6094 | ||
6095 | /* Now create the field with the original size. */ | |
6096 | field = create_field_decl (get_identifier ("F"), type, record, 0, | |
6097 | orig_size, bitsize_zero_node, 1); | |
6098 | DECL_INTERNAL_P (field) = 1; | |
6099 | ||
6100 | /* Do not finalize it until after the auxiliary record is built. */ | |
6101 | finish_record_type (record, field, 1, true); | |
6102 | ||
153edb51 | 6103 | /* Set the same size for its RM size if requested; otherwise reuse |
6104 | the RM size of the original type. */ | |
27becfc8 | 6105 | SET_TYPE_ADA_SIZE (record, same_rm_size ? size : orig_rm_size); |
6106 | ||
6107 | /* Unless debugging information isn't being written for the input type, | |
6108 | write a record that shows what we are a subtype of and also make a | |
ea5ec53d | 6109 | variable that indicates our size, if still variable. */ |
27becfc8 | 6110 | if (TYPE_NAME (record) |
6111 | && AGGREGATE_TYPE_P (type) | |
6112 | && TREE_CODE (orig_size) != INTEGER_CST | |
6113 | && !(TREE_CODE (TYPE_NAME (type)) == TYPE_DECL | |
6114 | && DECL_IGNORED_P (TYPE_NAME (type)))) | |
6115 | { | |
6116 | tree marker = make_node (RECORD_TYPE); | |
6117 | tree name = TYPE_NAME (record); | |
6118 | tree orig_name = TYPE_NAME (type); | |
6119 | ||
6120 | if (TREE_CODE (name) == TYPE_DECL) | |
6121 | name = DECL_NAME (name); | |
6122 | ||
6123 | if (TREE_CODE (orig_name) == TYPE_DECL) | |
6124 | orig_name = DECL_NAME (orig_name); | |
6125 | ||
e3698827 | 6126 | TYPE_NAME (marker) = concat_name (name, "XVS"); |
27becfc8 | 6127 | finish_record_type (marker, |
6128 | create_field_decl (orig_name, integer_type_node, | |
6129 | marker, 0, NULL_TREE, NULL_TREE, | |
6130 | 0), | |
6131 | 0, false); | |
6132 | ||
6133 | add_parallel_type (TYPE_STUB_DECL (record), marker); | |
6134 | ||
6135 | if (size && TREE_CODE (size) != INTEGER_CST && definition) | |
e3698827 | 6136 | create_var_decl (concat_name (name, "XVZ"), NULL_TREE, sizetype, |
6137 | TYPE_SIZE_UNIT (record), false, false, false, | |
6138 | false, NULL, gnat_entity); | |
27becfc8 | 6139 | } |
6140 | ||
6141 | rest_of_record_type_compilation (record); | |
6142 | ||
6143 | /* If the size was widened explicitly, maybe give a warning. Take the | |
6144 | original size as the maximum size of the input if there was an | |
6145 | unconstrained record involved and round it up to the specified alignment, | |
6146 | if one was specified. */ | |
6147 | if (CONTAINS_PLACEHOLDER_P (orig_size)) | |
6148 | orig_size = max_size (orig_size, true); | |
6149 | ||
6150 | if (align) | |
6151 | orig_size = round_up (orig_size, align); | |
6152 | ||
6153 | if (size && Present (gnat_entity) | |
6154 | && !operand_equal_p (size, orig_size, 0) | |
6155 | && !(TREE_CODE (size) == INTEGER_CST | |
6156 | && TREE_CODE (orig_size) == INTEGER_CST | |
6157 | && tree_int_cst_lt (size, orig_size))) | |
6158 | { | |
6159 | Node_Id gnat_error_node = Empty; | |
6160 | ||
6161 | if (Is_Packed_Array_Type (gnat_entity)) | |
6162 | gnat_entity = Original_Array_Type (gnat_entity); | |
6163 | ||
6164 | if ((Ekind (gnat_entity) == E_Component | |
6165 | || Ekind (gnat_entity) == E_Discriminant) | |
6166 | && Present (Component_Clause (gnat_entity))) | |
6167 | gnat_error_node = Last_Bit (Component_Clause (gnat_entity)); | |
6168 | else if (Present (Size_Clause (gnat_entity))) | |
6169 | gnat_error_node = Expression (Size_Clause (gnat_entity)); | |
6170 | ||
6171 | /* Generate message only for entities that come from source, since | |
6172 | if we have an entity created by expansion, the message will be | |
6173 | generated for some other corresponding source entity. */ | |
6174 | if (Comes_From_Source (gnat_entity) && Present (gnat_error_node)) | |
6175 | post_error_ne_tree ("{^ }bits of & unused?", gnat_error_node, | |
6176 | gnat_entity, | |
6177 | size_diffop (size, orig_size)); | |
6178 | ||
6179 | else if (*name_trailer == 'C' && !Is_Internal (gnat_entity)) | |
6180 | post_error_ne_tree ("component of& padded{ by ^ bits}?", | |
6181 | gnat_entity, gnat_entity, | |
6182 | size_diffop (size, orig_size)); | |
6183 | } | |
6184 | ||
6185 | return record; | |
6186 | } | |
6187 | \f | |
6188 | /* Given a GNU tree and a GNAT list of choices, generate an expression to test | |
6189 | the value passed against the list of choices. */ | |
6190 | ||
6191 | tree | |
6192 | choices_to_gnu (tree operand, Node_Id choices) | |
6193 | { | |
6194 | Node_Id choice; | |
6195 | Node_Id gnat_temp; | |
6196 | tree result = integer_zero_node; | |
6197 | tree this_test, low = 0, high = 0, single = 0; | |
6198 | ||
6199 | for (choice = First (choices); Present (choice); choice = Next (choice)) | |
6200 | { | |
6201 | switch (Nkind (choice)) | |
6202 | { | |
6203 | case N_Range: | |
6204 | low = gnat_to_gnu (Low_Bound (choice)); | |
6205 | high = gnat_to_gnu (High_Bound (choice)); | |
6206 | ||
6207 | /* There's no good type to use here, so we might as well use | |
6208 | integer_type_node. */ | |
6209 | this_test | |
6210 | = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node, | |
6211 | build_binary_op (GE_EXPR, integer_type_node, | |
6212 | operand, low), | |
6213 | build_binary_op (LE_EXPR, integer_type_node, | |
6214 | operand, high)); | |
6215 | ||
6216 | break; | |
6217 | ||
6218 | case N_Subtype_Indication: | |
6219 | gnat_temp = Range_Expression (Constraint (choice)); | |
6220 | low = gnat_to_gnu (Low_Bound (gnat_temp)); | |
6221 | high = gnat_to_gnu (High_Bound (gnat_temp)); | |
6222 | ||
6223 | this_test | |
6224 | = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node, | |
6225 | build_binary_op (GE_EXPR, integer_type_node, | |
6226 | operand, low), | |
6227 | build_binary_op (LE_EXPR, integer_type_node, | |
6228 | operand, high)); | |
6229 | break; | |
6230 | ||
6231 | case N_Identifier: | |
6232 | case N_Expanded_Name: | |
6233 | /* This represents either a subtype range, an enumeration | |
6234 | literal, or a constant Ekind says which. If an enumeration | |
6235 | literal or constant, fall through to the next case. */ | |
6236 | if (Ekind (Entity (choice)) != E_Enumeration_Literal | |
6237 | && Ekind (Entity (choice)) != E_Constant) | |
6238 | { | |
6239 | tree type = gnat_to_gnu_type (Entity (choice)); | |
6240 | ||
6241 | low = TYPE_MIN_VALUE (type); | |
6242 | high = TYPE_MAX_VALUE (type); | |
6243 | ||
6244 | this_test | |
6245 | = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node, | |
6246 | build_binary_op (GE_EXPR, integer_type_node, | |
6247 | operand, low), | |
6248 | build_binary_op (LE_EXPR, integer_type_node, | |
6249 | operand, high)); | |
6250 | break; | |
6251 | } | |
ea5ec53d | 6252 | |
27becfc8 | 6253 | /* ... fall through ... */ |
ea5ec53d | 6254 | |
27becfc8 | 6255 | case N_Character_Literal: |
6256 | case N_Integer_Literal: | |
6257 | single = gnat_to_gnu (choice); | |
6258 | this_test = build_binary_op (EQ_EXPR, integer_type_node, operand, | |
6259 | single); | |
6260 | break; | |
6261 | ||
6262 | case N_Others_Choice: | |
6263 | this_test = integer_one_node; | |
6264 | break; | |
6265 | ||
6266 | default: | |
6267 | gcc_unreachable (); | |
6268 | } | |
6269 | ||
6270 | result = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node, | |
6271 | result, this_test); | |
6272 | } | |
6273 | ||
6274 | return result; | |
6275 | } | |
6276 | \f | |
6277 | /* Adjust PACKED setting as passed to gnat_to_gnu_field for a field of | |
6278 | type FIELD_TYPE to be placed in RECORD_TYPE. Return the result. */ | |
6279 | ||
6280 | static int | |
6281 | adjust_packed (tree field_type, tree record_type, int packed) | |
6282 | { | |
6283 | /* If the field contains an item of variable size, we cannot pack it | |
6284 | because we cannot create temporaries of non-fixed size in case | |
6285 | we need to take the address of the field. See addressable_p and | |
6286 | the notes on the addressability issues for further details. */ | |
6287 | if (is_variable_size (field_type)) | |
6288 | return 0; | |
6289 | ||
6290 | /* If the alignment of the record is specified and the field type | |
6291 | is over-aligned, request Storage_Unit alignment for the field. */ | |
6292 | if (packed == -2) | |
6293 | { | |
6294 | if (TYPE_ALIGN (field_type) > TYPE_ALIGN (record_type)) | |
6295 | return -1; | |
6296 | else | |
6297 | return 0; | |
6298 | } | |
6299 | ||
6300 | return packed; | |
6301 | } | |
6302 | ||
6303 | /* Return a GCC tree for a field corresponding to GNAT_FIELD to be | |
6304 | placed in GNU_RECORD_TYPE. | |
6305 | ||
6306 | PACKED is 1 if the enclosing record is packed, -1 if the enclosing | |
6307 | record has Component_Alignment of Storage_Unit, -2 if the enclosing | |
6308 | record has a specified alignment. | |
6309 | ||
6310 | DEFINITION is true if this field is for a record being defined. */ | |
6311 | ||
6312 | static tree | |
6313 | gnat_to_gnu_field (Entity_Id gnat_field, tree gnu_record_type, int packed, | |
6314 | bool definition) | |
6315 | { | |
6316 | tree gnu_field_id = get_entity_name (gnat_field); | |
6317 | tree gnu_field_type = gnat_to_gnu_type (Etype (gnat_field)); | |
6318 | tree gnu_field, gnu_size, gnu_pos; | |
6319 | bool needs_strict_alignment | |
6320 | = (Is_Aliased (gnat_field) || Strict_Alignment (Etype (gnat_field)) | |
6321 | || Treat_As_Volatile (gnat_field)); | |
6322 | ||
6323 | /* If this field requires strict alignment, we cannot pack it because | |
6324 | it would very likely be under-aligned in the record. */ | |
6325 | if (needs_strict_alignment) | |
6326 | packed = 0; | |
6327 | else | |
6328 | packed = adjust_packed (gnu_field_type, gnu_record_type, packed); | |
6329 | ||
6330 | /* If a size is specified, use it. Otherwise, if the record type is packed, | |
6331 | use the official RM size. See "Handling of Type'Size Values" in Einfo | |
6332 | for further details. */ | |
6333 | if (Known_Static_Esize (gnat_field)) | |
6334 | gnu_size = validate_size (Esize (gnat_field), gnu_field_type, | |
6335 | gnat_field, FIELD_DECL, false, true); | |
6336 | else if (packed == 1) | |
6337 | gnu_size = validate_size (RM_Size (Etype (gnat_field)), gnu_field_type, | |
6338 | gnat_field, FIELD_DECL, false, true); | |
6339 | else | |
6340 | gnu_size = NULL_TREE; | |
6341 | ||
6342 | /* If we have a specified size that's smaller than that of the field type, | |
f6b2b596 | 6343 | or a position is specified, and the field type is a record, see if we can |
6344 | get either an integral mode form of the type or a smaller form. If we | |
6345 | can, show a size was specified for the field if there wasn't one already, | |
6346 | so we know to make this a bitfield and avoid making things wider. | |
27becfc8 | 6347 | |
6348 | Doing this is first useful if the record is packed because we may then | |
6349 | place the field at a non-byte-aligned position and so achieve tighter | |
6350 | packing. | |
6351 | ||
6352 | This is in addition *required* if the field shares a byte with another | |
6353 | field and the front-end lets the back-end handle the references, because | |
6354 | GCC does not handle BLKmode bitfields properly. | |
6355 | ||
6356 | We avoid the transformation if it is not required or potentially useful, | |
6357 | as it might entail an increase of the field's alignment and have ripple | |
6358 | effects on the outer record type. A typical case is a field known to be | |
6359 | byte aligned and not to share a byte with another field. | |
6360 | ||
6361 | Besides, we don't even look the possibility of a transformation in cases | |
6362 | known to be in error already, for instance when an invalid size results | |
6363 | from a component clause. */ | |
6364 | ||
6365 | if (TREE_CODE (gnu_field_type) == RECORD_TYPE | |
f6b2b596 | 6366 | && !TYPE_IS_FAT_POINTER_P (gnu_field_type) |
27becfc8 | 6367 | && host_integerp (TYPE_SIZE (gnu_field_type), 1) |
6368 | && (packed == 1 | |
6369 | || (gnu_size | |
6370 | && (tree_int_cst_lt (gnu_size, TYPE_SIZE (gnu_field_type)) | |
6371 | || Present (Component_Clause (gnat_field)))))) | |
6372 | { | |
6373 | /* See what the alternate type and size would be. */ | |
6374 | tree gnu_packable_type = make_packable_type (gnu_field_type, true); | |
6375 | ||
6376 | bool has_byte_aligned_clause | |
6377 | = Present (Component_Clause (gnat_field)) | |
6378 | && (UI_To_Int (Component_Bit_Offset (gnat_field)) | |
6379 | % BITS_PER_UNIT == 0); | |
6380 | ||
6381 | /* Compute whether we should avoid the substitution. */ | |
6382 | bool reject | |
6383 | /* There is no point substituting if there is no change... */ | |
6384 | = (gnu_packable_type == gnu_field_type) | |
6385 | /* ... nor when the field is known to be byte aligned and not to | |
6386 | share a byte with another field. */ | |
6387 | || (has_byte_aligned_clause | |
6388 | && value_factor_p (gnu_size, BITS_PER_UNIT)) | |
6389 | /* The size of an aliased field must be an exact multiple of the | |
6390 | type's alignment, which the substitution might increase. Reject | |
6391 | substitutions that would so invalidate a component clause when the | |
6392 | specified position is byte aligned, as the change would have no | |
6393 | real benefit from the packing standpoint anyway. */ | |
6394 | || (Is_Aliased (gnat_field) | |
6395 | && has_byte_aligned_clause | |
6396 | && !value_factor_p (gnu_size, TYPE_ALIGN (gnu_packable_type))); | |
6397 | ||
6398 | /* Substitute unless told otherwise. */ | |
6399 | if (!reject) | |
6400 | { | |
6401 | gnu_field_type = gnu_packable_type; | |
6402 | ||
6403 | if (!gnu_size) | |
6404 | gnu_size = rm_size (gnu_field_type); | |
6405 | } | |
6406 | } | |
6407 | ||
6408 | /* If we are packing the record and the field is BLKmode, round the | |
6409 | size up to a byte boundary. */ | |
6410 | if (packed && TYPE_MODE (gnu_field_type) == BLKmode && gnu_size) | |
6411 | gnu_size = round_up (gnu_size, BITS_PER_UNIT); | |
6412 | ||
6413 | if (Present (Component_Clause (gnat_field))) | |
6414 | { | |
6415 | gnu_pos = UI_To_gnu (Component_Bit_Offset (gnat_field), bitsizetype); | |
6416 | gnu_size = validate_size (Esize (gnat_field), gnu_field_type, | |
6417 | gnat_field, FIELD_DECL, false, true); | |
6418 | ||
6419 | /* Ensure the position does not overlap with the parent subtype, | |
6420 | if there is one. */ | |
6421 | if (Present (Parent_Subtype (Underlying_Type (Scope (gnat_field))))) | |
6422 | { | |
6423 | tree gnu_parent | |
6424 | = gnat_to_gnu_type (Parent_Subtype | |
6425 | (Underlying_Type (Scope (gnat_field)))); | |
6426 | ||
6427 | if (TREE_CODE (TYPE_SIZE (gnu_parent)) == INTEGER_CST | |
6428 | && tree_int_cst_lt (gnu_pos, TYPE_SIZE (gnu_parent))) | |
6429 | { | |
6430 | post_error_ne_tree | |
6431 | ("offset of& must be beyond parent{, minimum allowed is ^}", | |
6432 | First_Bit (Component_Clause (gnat_field)), gnat_field, | |
6433 | TYPE_SIZE_UNIT (gnu_parent)); | |
6434 | } | |
6435 | } | |
6436 | ||
6437 | /* If this field needs strict alignment, ensure the record is | |
6438 | sufficiently aligned and that that position and size are | |
6439 | consistent with the alignment. */ | |
6440 | if (needs_strict_alignment) | |
6441 | { | |
6442 | TYPE_ALIGN (gnu_record_type) | |
6443 | = MAX (TYPE_ALIGN (gnu_record_type), TYPE_ALIGN (gnu_field_type)); | |
6444 | ||
6445 | if (gnu_size | |
6446 | && !operand_equal_p (gnu_size, TYPE_SIZE (gnu_field_type), 0)) | |
6447 | { | |
6448 | if (Is_Atomic (gnat_field) || Is_Atomic (Etype (gnat_field))) | |
6449 | post_error_ne_tree | |
6450 | ("atomic field& must be natural size of type{ (^)}", | |
6451 | Last_Bit (Component_Clause (gnat_field)), gnat_field, | |
6452 | TYPE_SIZE (gnu_field_type)); | |
6453 | ||
6454 | else if (Is_Aliased (gnat_field)) | |
6455 | post_error_ne_tree | |
6456 | ("size of aliased field& must be ^ bits", | |
6457 | Last_Bit (Component_Clause (gnat_field)), gnat_field, | |
6458 | TYPE_SIZE (gnu_field_type)); | |
6459 | ||
6460 | else if (Strict_Alignment (Etype (gnat_field))) | |
6461 | post_error_ne_tree | |
6462 | ("size of & with aliased or tagged components not ^ bits", | |
6463 | Last_Bit (Component_Clause (gnat_field)), gnat_field, | |
6464 | TYPE_SIZE (gnu_field_type)); | |
6465 | ||
6466 | gnu_size = NULL_TREE; | |
6467 | } | |
6468 | ||
6469 | if (!integer_zerop (size_binop | |
6470 | (TRUNC_MOD_EXPR, gnu_pos, | |
6471 | bitsize_int (TYPE_ALIGN (gnu_field_type))))) | |
6472 | { | |
6473 | if (Is_Aliased (gnat_field)) | |
6474 | post_error_ne_num | |
6475 | ("position of aliased field& must be multiple of ^ bits", | |
6476 | First_Bit (Component_Clause (gnat_field)), gnat_field, | |
6477 | TYPE_ALIGN (gnu_field_type)); | |
6478 | ||
6479 | else if (Treat_As_Volatile (gnat_field)) | |
6480 | post_error_ne_num | |
6481 | ("position of volatile field& must be multiple of ^ bits", | |
6482 | First_Bit (Component_Clause (gnat_field)), gnat_field, | |
6483 | TYPE_ALIGN (gnu_field_type)); | |
6484 | ||
6485 | else if (Strict_Alignment (Etype (gnat_field))) | |
6486 | post_error_ne_num | |
6487 | ("position of & with aliased or tagged components not multiple of ^ bits", | |
6488 | First_Bit (Component_Clause (gnat_field)), gnat_field, | |
6489 | TYPE_ALIGN (gnu_field_type)); | |
6490 | ||
6491 | else | |
6492 | gcc_unreachable (); | |
6493 | ||
6494 | gnu_pos = NULL_TREE; | |
6495 | } | |
6496 | } | |
6497 | ||
6498 | if (Is_Atomic (gnat_field)) | |
6499 | check_ok_for_atomic (gnu_field_type, gnat_field, false); | |
6500 | } | |
6501 | ||
6502 | /* If the record has rep clauses and this is the tag field, make a rep | |
6503 | clause for it as well. */ | |
6504 | else if (Has_Specified_Layout (Scope (gnat_field)) | |
6505 | && Chars (gnat_field) == Name_uTag) | |
6506 | { | |
6507 | gnu_pos = bitsize_zero_node; | |
6508 | gnu_size = TYPE_SIZE (gnu_field_type); | |
6509 | } | |
6510 | ||
6511 | else | |
6512 | gnu_pos = NULL_TREE; | |
6513 | ||
6514 | /* We need to make the size the maximum for the type if it is | |
6515 | self-referential and an unconstrained type. In that case, we can't | |
6516 | pack the field since we can't make a copy to align it. */ | |
6517 | if (TREE_CODE (gnu_field_type) == RECORD_TYPE | |
6518 | && !gnu_size | |
6519 | && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_field_type)) | |
6520 | && !Is_Constrained (Underlying_Type (Etype (gnat_field)))) | |
6521 | { | |
6522 | gnu_size = max_size (TYPE_SIZE (gnu_field_type), true); | |
6523 | packed = 0; | |
6524 | } | |
6525 | ||
6526 | /* If a size is specified, adjust the field's type to it. */ | |
6527 | if (gnu_size) | |
6528 | { | |
6529 | /* If the field's type is justified modular, we would need to remove | |
6530 | the wrapper to (better) meet the layout requirements. However we | |
6531 | can do so only if the field is not aliased to preserve the unique | |
6532 | layout and if the prescribed size is not greater than that of the | |
6533 | packed array to preserve the justification. */ | |
6534 | if (!needs_strict_alignment | |
6535 | && TREE_CODE (gnu_field_type) == RECORD_TYPE | |
6536 | && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type) | |
6537 | && tree_int_cst_compare (gnu_size, TYPE_ADA_SIZE (gnu_field_type)) | |
6538 | <= 0) | |
6539 | gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type)); | |
6540 | ||
6541 | gnu_field_type | |
6542 | = make_type_from_size (gnu_field_type, gnu_size, | |
6543 | Has_Biased_Representation (gnat_field)); | |
6544 | gnu_field_type = maybe_pad_type (gnu_field_type, gnu_size, 0, gnat_field, | |
6545 | "PAD", false, definition, true); | |
6546 | } | |
6547 | ||
6548 | /* Otherwise (or if there was an error), don't specify a position. */ | |
6549 | else | |
6550 | gnu_pos = NULL_TREE; | |
6551 | ||
6552 | gcc_assert (TREE_CODE (gnu_field_type) != RECORD_TYPE | |
6553 | || !TYPE_CONTAINS_TEMPLATE_P (gnu_field_type)); | |
6554 | ||
6555 | /* Now create the decl for the field. */ | |
6556 | gnu_field = create_field_decl (gnu_field_id, gnu_field_type, gnu_record_type, | |
6557 | packed, gnu_size, gnu_pos, | |
6558 | Is_Aliased (gnat_field)); | |
6559 | Sloc_to_locus (Sloc (gnat_field), &DECL_SOURCE_LOCATION (gnu_field)); | |
6560 | TREE_THIS_VOLATILE (gnu_field) = Treat_As_Volatile (gnat_field); | |
6561 | ||
6562 | if (Ekind (gnat_field) == E_Discriminant) | |
6563 | DECL_DISCRIMINANT_NUMBER (gnu_field) | |
6564 | = UI_To_gnu (Discriminant_Number (gnat_field), sizetype); | |
6565 | ||
6566 | return gnu_field; | |
6567 | } | |
6568 | \f | |
6569 | /* Return true if TYPE is a type with variable size, a padding type with a | |
6570 | field of variable size or is a record that has a field such a field. */ | |
6571 | ||
6572 | static bool | |
6573 | is_variable_size (tree type) | |
6574 | { | |
6575 | tree field; | |
6576 | ||
6577 | if (!TREE_CONSTANT (TYPE_SIZE (type))) | |
6578 | return true; | |
6579 | ||
6580 | if (TREE_CODE (type) == RECORD_TYPE | |
6581 | && TYPE_IS_PADDING_P (type) | |
6582 | && !TREE_CONSTANT (DECL_SIZE (TYPE_FIELDS (type)))) | |
6583 | return true; | |
6584 | ||
6585 | if (TREE_CODE (type) != RECORD_TYPE | |
6586 | && TREE_CODE (type) != UNION_TYPE | |
6587 | && TREE_CODE (type) != QUAL_UNION_TYPE) | |
6588 | return false; | |
6589 | ||
6590 | for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) | |
6591 | if (is_variable_size (TREE_TYPE (field))) | |
6592 | return true; | |
6593 | ||
6594 | return false; | |
6595 | } | |
6596 | \f | |
6597 | /* qsort comparer for the bit positions of two record components. */ | |
6598 | ||
6599 | static int | |
6600 | compare_field_bitpos (const PTR rt1, const PTR rt2) | |
6601 | { | |
6602 | const_tree const field1 = * (const_tree const *) rt1; | |
6603 | const_tree const field2 = * (const_tree const *) rt2; | |
6604 | const int ret | |
6605 | = tree_int_cst_compare (bit_position (field1), bit_position (field2)); | |
6606 | ||
6607 | return ret ? ret : (int) (DECL_UID (field1) - DECL_UID (field2)); | |
6608 | } | |
6609 | ||
6610 | /* Return a GCC tree for a record type given a GNAT Component_List and a chain | |
6611 | of GCC trees for fields that are in the record and have already been | |
6612 | processed. When called from gnat_to_gnu_entity during the processing of a | |
6613 | record type definition, the GCC nodes for the discriminants will be on | |
6614 | the chain. The other calls to this function are recursive calls from | |
6615 | itself for the Component_List of a variant and the chain is empty. | |
6616 | ||
6617 | PACKED is 1 if this is for a packed record, -1 if this is for a record | |
6618 | with Component_Alignment of Storage_Unit, -2 if this is for a record | |
6619 | with a specified alignment. | |
6620 | ||
6621 | DEFINITION is true if we are defining this record. | |
6622 | ||
6623 | P_GNU_REP_LIST, if nonzero, is a pointer to a list to which each field | |
6624 | with a rep clause is to be added. If it is nonzero, that is all that | |
6625 | should be done with such fields. | |
6626 | ||
6627 | CANCEL_ALIGNMENT, if true, means the alignment should be zeroed before | |
6628 | laying out the record. This means the alignment only serves to force fields | |
6629 | to be bitfields, but not require the record to be that aligned. This is | |
6630 | used for variants. | |
6631 | ||
6632 | ALL_REP, if true, means a rep clause was found for all the fields. This | |
6633 | simplifies the logic since we know we're not in the mixed case. | |
6634 | ||
6635 | DO_NOT_FINALIZE, if true, means that the record type is expected to be | |
6636 | modified afterwards so it will not be sent to the back-end for finalization. | |
6637 | ||
6638 | UNCHECKED_UNION, if true, means that we are building a type for a record | |
6639 | with a Pragma Unchecked_Union. | |
6640 | ||
6641 | The processing of the component list fills in the chain with all of the | |
6642 | fields of the record and then the record type is finished. */ | |
6643 | ||
6644 | static void | |
6645 | components_to_record (tree gnu_record_type, Node_Id component_list, | |
6646 | tree gnu_field_list, int packed, bool definition, | |
6647 | tree *p_gnu_rep_list, bool cancel_alignment, | |
6648 | bool all_rep, bool do_not_finalize, bool unchecked_union) | |
6649 | { | |
6650 | Node_Id component_decl; | |
6651 | Entity_Id gnat_field; | |
6652 | Node_Id variant_part; | |
6653 | tree gnu_our_rep_list = NULL_TREE; | |
6654 | tree gnu_field, gnu_last; | |
6655 | bool layout_with_rep = false; | |
6656 | bool all_rep_and_size = all_rep && TYPE_SIZE (gnu_record_type); | |
6657 | ||
6658 | /* For each variable within each component declaration create a GCC field | |
6659 | and add it to the list, skipping any pragmas in the list. */ | |
6660 | if (Present (Component_Items (component_list))) | |
6661 | for (component_decl = First_Non_Pragma (Component_Items (component_list)); | |
6662 | Present (component_decl); | |
6663 | component_decl = Next_Non_Pragma (component_decl)) | |
6664 | { | |
6665 | gnat_field = Defining_Entity (component_decl); | |
6666 | ||
6667 | if (Chars (gnat_field) == Name_uParent) | |
6668 | gnu_field = tree_last (TYPE_FIELDS (gnu_record_type)); | |
6669 | else | |
6670 | { | |
6671 | gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type, | |
6672 | packed, definition); | |
6673 | ||
6674 | /* If this is the _Tag field, put it before any discriminants, | |
c4f4d389 | 6675 | instead of after them as is the case for all other fields. */ |
27becfc8 | 6676 | if (Chars (gnat_field) == Name_uTag) |
6677 | gnu_field_list = chainon (gnu_field_list, gnu_field); | |
6678 | else | |
6679 | { | |
6680 | TREE_CHAIN (gnu_field) = gnu_field_list; | |
6681 | gnu_field_list = gnu_field; | |
6682 | } | |
6683 | } | |
6684 | ||
ea5ec53d | 6685 | save_gnu_tree (gnat_field, gnu_field, false); |
27becfc8 | 6686 | } |
6687 | ||
6688 | /* At the end of the component list there may be a variant part. */ | |
6689 | variant_part = Variant_Part (component_list); | |
6690 | ||
6691 | /* We create a QUAL_UNION_TYPE for the variant part since the variants are | |
6692 | mutually exclusive and should go in the same memory. To do this we need | |
6693 | to treat each variant as a record whose elements are created from the | |
6694 | component list for the variant. So here we create the records from the | |
6695 | lists for the variants and put them all into the QUAL_UNION_TYPE. | |
6696 | If this is an Unchecked_Union, we make a UNION_TYPE instead or | |
6697 | use GNU_RECORD_TYPE if there are no fields so far. */ | |
6698 | if (Present (variant_part)) | |
6699 | { | |
e3698827 | 6700 | Node_Id gnat_discr = Name (variant_part), variant; |
6701 | tree gnu_discr = gnat_to_gnu (gnat_discr); | |
27becfc8 | 6702 | tree gnu_name = TYPE_NAME (gnu_record_type); |
6703 | tree gnu_var_name | |
e3698827 | 6704 | = concat_name (get_identifier (Get_Name_String (Chars (gnat_discr))), |
6705 | "XVN"); | |
6706 | tree gnu_union_type, gnu_union_name, gnu_union_field; | |
27becfc8 | 6707 | tree gnu_variant_list = NULL_TREE; |
6708 | ||
6709 | if (TREE_CODE (gnu_name) == TYPE_DECL) | |
6710 | gnu_name = DECL_NAME (gnu_name); | |
6711 | ||
e3698827 | 6712 | gnu_union_name |
6713 | = concat_name (gnu_name, IDENTIFIER_POINTER (gnu_var_name)); | |
27becfc8 | 6714 | |
6715 | /* Reuse an enclosing union if all fields are in the variant part | |
6716 | and there is no representation clause on the record, to match | |
6717 | the layout of C unions. There is an associated check below. */ | |
6718 | if (!gnu_field_list | |
6719 | && TREE_CODE (gnu_record_type) == UNION_TYPE | |
6720 | && !TYPE_PACKED (gnu_record_type)) | |
6721 | gnu_union_type = gnu_record_type; | |
6722 | else | |
6723 | { | |
6724 | gnu_union_type | |
6725 | = make_node (unchecked_union ? UNION_TYPE : QUAL_UNION_TYPE); | |
6726 | ||
6727 | TYPE_NAME (gnu_union_type) = gnu_union_name; | |
6728 | TYPE_ALIGN (gnu_union_type) = 0; | |
6729 | TYPE_PACKED (gnu_union_type) = TYPE_PACKED (gnu_record_type); | |
6730 | } | |
6731 | ||
6732 | for (variant = First_Non_Pragma (Variants (variant_part)); | |
6733 | Present (variant); | |
6734 | variant = Next_Non_Pragma (variant)) | |
6735 | { | |
6736 | tree gnu_variant_type = make_node (RECORD_TYPE); | |
6737 | tree gnu_inner_name; | |
6738 | tree gnu_qual; | |
6739 | ||
6740 | Get_Variant_Encoding (variant); | |
e3698827 | 6741 | gnu_inner_name = get_identifier_with_length (Name_Buffer, Name_Len); |
27becfc8 | 6742 | TYPE_NAME (gnu_variant_type) |
e3698827 | 6743 | = concat_name (gnu_union_name, |
6744 | IDENTIFIER_POINTER (gnu_inner_name)); | |
27becfc8 | 6745 | |
6746 | /* Set the alignment of the inner type in case we need to make | |
6747 | inner objects into bitfields, but then clear it out | |
6748 | so the record actually gets only the alignment required. */ | |
6749 | TYPE_ALIGN (gnu_variant_type) = TYPE_ALIGN (gnu_record_type); | |
6750 | TYPE_PACKED (gnu_variant_type) = TYPE_PACKED (gnu_record_type); | |
6751 | ||
6752 | /* Similarly, if the outer record has a size specified and all fields | |
6753 | have record rep clauses, we can propagate the size into the | |
6754 | variant part. */ | |
6755 | if (all_rep_and_size) | |
6756 | { | |
6757 | TYPE_SIZE (gnu_variant_type) = TYPE_SIZE (gnu_record_type); | |
6758 | TYPE_SIZE_UNIT (gnu_variant_type) | |
6759 | = TYPE_SIZE_UNIT (gnu_record_type); | |
6760 | } | |
6761 | ||
6762 | /* Create the record type for the variant. Note that we defer | |
6763 | finalizing it until after we are sure to actually use it. */ | |
6764 | components_to_record (gnu_variant_type, Component_List (variant), | |
6765 | NULL_TREE, packed, definition, | |
6766 | &gnu_our_rep_list, !all_rep_and_size, all_rep, | |
6767 | true, unchecked_union); | |
6768 | ||
e3698827 | 6769 | gnu_qual = choices_to_gnu (gnu_discr, Discrete_Choices (variant)); |
27becfc8 | 6770 | |
6771 | Set_Present_Expr (variant, annotate_value (gnu_qual)); | |
6772 | ||
6773 | /* If this is an Unchecked_Union and we have exactly one field, | |
6774 | use this field directly to match the layout of C unions. */ | |
6775 | if (unchecked_union | |
6776 | && TYPE_FIELDS (gnu_variant_type) | |
6777 | && !TREE_CHAIN (TYPE_FIELDS (gnu_variant_type))) | |
6778 | gnu_field = TYPE_FIELDS (gnu_variant_type); | |
6779 | else | |
6780 | { | |
6781 | /* Deal with packedness like in gnat_to_gnu_field. */ | |
6782 | int field_packed | |
6783 | = adjust_packed (gnu_variant_type, gnu_record_type, packed); | |
6784 | ||
6785 | /* Finalize the record type now. We used to throw away | |
6786 | empty records but we no longer do that because we need | |
6787 | them to generate complete debug info for the variant; | |
6788 | otherwise, the union type definition will be lacking | |
6789 | the fields associated with these empty variants. */ | |
6790 | rest_of_record_type_compilation (gnu_variant_type); | |
6791 | ||
6792 | gnu_field = create_field_decl (gnu_inner_name, gnu_variant_type, | |
6793 | gnu_union_type, field_packed, | |
6794 | (all_rep_and_size | |
6795 | ? TYPE_SIZE (gnu_variant_type) | |
6796 | : 0), | |
6797 | (all_rep_and_size | |
6798 | ? bitsize_zero_node : 0), | |
6799 | 0); | |
6800 | ||
6801 | DECL_INTERNAL_P (gnu_field) = 1; | |
6802 | ||
6803 | if (!unchecked_union) | |
6804 | DECL_QUALIFIER (gnu_field) = gnu_qual; | |
6805 | } | |
6806 | ||
6807 | TREE_CHAIN (gnu_field) = gnu_variant_list; | |
6808 | gnu_variant_list = gnu_field; | |
6809 | } | |
6810 | ||
6811 | /* Only make the QUAL_UNION_TYPE if there are any non-empty variants. */ | |
6812 | if (gnu_variant_list) | |
6813 | { | |
6814 | int union_field_packed; | |
6815 | ||
6816 | if (all_rep_and_size) | |
6817 | { | |
6818 | TYPE_SIZE (gnu_union_type) = TYPE_SIZE (gnu_record_type); | |
6819 | TYPE_SIZE_UNIT (gnu_union_type) | |
6820 | = TYPE_SIZE_UNIT (gnu_record_type); | |
6821 | } | |
6822 | ||
6823 | finish_record_type (gnu_union_type, nreverse (gnu_variant_list), | |
6824 | all_rep_and_size ? 1 : 0, false); | |
6825 | ||
6826 | /* If GNU_UNION_TYPE is our record type, it means we must have an | |
6827 | Unchecked_Union with no fields. Verify that and, if so, just | |
6828 | return. */ | |
6829 | if (gnu_union_type == gnu_record_type) | |
6830 | { | |
6831 | gcc_assert (unchecked_union | |
6832 | && !gnu_field_list | |
6833 | && !gnu_our_rep_list); | |
6834 | return; | |
6835 | } | |
6836 | ||
6837 | /* Deal with packedness like in gnat_to_gnu_field. */ | |
6838 | union_field_packed | |
6839 | = adjust_packed (gnu_union_type, gnu_record_type, packed); | |
6840 | ||
6841 | gnu_union_field | |
6842 | = create_field_decl (gnu_var_name, gnu_union_type, gnu_record_type, | |
6843 | union_field_packed, | |
6844 | all_rep ? TYPE_SIZE (gnu_union_type) : 0, | |
6845 | all_rep ? bitsize_zero_node : 0, 0); | |
6846 | ||
6847 | DECL_INTERNAL_P (gnu_union_field) = 1; | |
6848 | TREE_CHAIN (gnu_union_field) = gnu_field_list; | |
6849 | gnu_field_list = gnu_union_field; | |
6850 | } | |
6851 | } | |
6852 | ||
6853 | /* Scan GNU_FIELD_LIST and see if any fields have rep clauses. If they | |
6854 | do, pull them out and put them into GNU_OUR_REP_LIST. We have to do this | |
6855 | in a separate pass since we want to handle the discriminants but can't | |
6856 | play with them until we've used them in debugging data above. | |
6857 | ||
6858 | ??? Note: if we then reorder them, debugging information will be wrong, | |
6859 | but there's nothing that can be done about this at the moment. */ | |
6860 | for (gnu_field = gnu_field_list, gnu_last = NULL_TREE; gnu_field; ) | |
6861 | { | |
6862 | if (DECL_FIELD_OFFSET (gnu_field)) | |
6863 | { | |
6864 | tree gnu_next = TREE_CHAIN (gnu_field); | |
6865 | ||
6866 | if (!gnu_last) | |
6867 | gnu_field_list = gnu_next; | |
6868 | else | |
6869 | TREE_CHAIN (gnu_last) = gnu_next; | |
6870 | ||
6871 | TREE_CHAIN (gnu_field) = gnu_our_rep_list; | |
6872 | gnu_our_rep_list = gnu_field; | |
6873 | gnu_field = gnu_next; | |
6874 | } | |
6875 | else | |
6876 | { | |
6877 | gnu_last = gnu_field; | |
6878 | gnu_field = TREE_CHAIN (gnu_field); | |
6879 | } | |
6880 | } | |
6881 | ||
6882 | /* If we have any items in our rep'ed field list, it is not the case that all | |
6883 | the fields in the record have rep clauses, and P_REP_LIST is nonzero, | |
6884 | set it and ignore the items. */ | |
6885 | if (gnu_our_rep_list && p_gnu_rep_list && !all_rep) | |
6886 | *p_gnu_rep_list = chainon (*p_gnu_rep_list, gnu_our_rep_list); | |
6887 | else if (gnu_our_rep_list) | |
6888 | { | |
6889 | /* Otherwise, sort the fields by bit position and put them into their | |
ea5ec53d | 6890 | own record if we have any fields without rep clauses. */ |
27becfc8 | 6891 | tree gnu_rep_type |
6892 | = (gnu_field_list ? make_node (RECORD_TYPE) : gnu_record_type); | |
6893 | int len = list_length (gnu_our_rep_list); | |
6894 | tree *gnu_arr = (tree *) alloca (sizeof (tree) * len); | |
6895 | int i; | |
6896 | ||
6897 | for (i = 0, gnu_field = gnu_our_rep_list; gnu_field; | |
6898 | gnu_field = TREE_CHAIN (gnu_field), i++) | |
6899 | gnu_arr[i] = gnu_field; | |
6900 | ||
6901 | qsort (gnu_arr, len, sizeof (tree), compare_field_bitpos); | |
6902 | ||
6903 | /* Put the fields in the list in order of increasing position, which | |
6904 | means we start from the end. */ | |
6905 | gnu_our_rep_list = NULL_TREE; | |
6906 | for (i = len - 1; i >= 0; i--) | |
6907 | { | |
6908 | TREE_CHAIN (gnu_arr[i]) = gnu_our_rep_list; | |
6909 | gnu_our_rep_list = gnu_arr[i]; | |
6910 | DECL_CONTEXT (gnu_arr[i]) = gnu_rep_type; | |
6911 | } | |
6912 | ||
6913 | if (gnu_field_list) | |
6914 | { | |
6915 | finish_record_type (gnu_rep_type, gnu_our_rep_list, 1, false); | |
6916 | gnu_field = create_field_decl (get_identifier ("REP"), gnu_rep_type, | |
6917 | gnu_record_type, 0, 0, 0, 1); | |
6918 | DECL_INTERNAL_P (gnu_field) = 1; | |
6919 | gnu_field_list = chainon (gnu_field_list, gnu_field); | |
6920 | } | |
6921 | else | |
6922 | { | |
6923 | layout_with_rep = true; | |
6924 | gnu_field_list = nreverse (gnu_our_rep_list); | |
6925 | } | |
6926 | } | |
6927 | ||
6928 | if (cancel_alignment) | |
6929 | TYPE_ALIGN (gnu_record_type) = 0; | |
6930 | ||
6931 | finish_record_type (gnu_record_type, nreverse (gnu_field_list), | |
6932 | layout_with_rep ? 1 : 0, do_not_finalize); | |
6933 | } | |
6934 | \f | |
6935 | /* Given GNU_SIZE, a GCC tree representing a size, return a Uint to be | |
6936 | placed into an Esize, Component_Bit_Offset, or Component_Size value | |
6937 | in the GNAT tree. */ | |
6938 | ||
6939 | static Uint | |
6940 | annotate_value (tree gnu_size) | |
6941 | { | |
6942 | int len = TREE_CODE_LENGTH (TREE_CODE (gnu_size)); | |
6943 | TCode tcode; | |
6944 | Node_Ref_Or_Val ops[3], ret; | |
6945 | int i; | |
6946 | int size; | |
6947 | struct tree_int_map **h = NULL; | |
6948 | ||
6949 | /* See if we've already saved the value for this node. */ | |
6950 | if (EXPR_P (gnu_size)) | |
6951 | { | |
6952 | struct tree_int_map in; | |
6953 | if (!annotate_value_cache) | |
6954 | annotate_value_cache = htab_create_ggc (512, tree_int_map_hash, | |
6955 | tree_int_map_eq, 0); | |
6956 | in.base.from = gnu_size; | |
6957 | h = (struct tree_int_map **) | |
6958 | htab_find_slot (annotate_value_cache, &in, INSERT); | |
6959 | ||
6960 | if (*h) | |
6961 | return (Node_Ref_Or_Val) (*h)->to; | |
6962 | } | |
6963 | ||
6964 | /* If we do not return inside this switch, TCODE will be set to the | |
6965 | code to use for a Create_Node operand and LEN (set above) will be | |
6966 | the number of recursive calls for us to make. */ | |
6967 | ||
6968 | switch (TREE_CODE (gnu_size)) | |
6969 | { | |
6970 | case INTEGER_CST: | |
6971 | if (TREE_OVERFLOW (gnu_size)) | |
6972 | return No_Uint; | |
6973 | ||
6974 | /* This may have come from a conversion from some smaller type, | |
6975 | so ensure this is in bitsizetype. */ | |
6976 | gnu_size = convert (bitsizetype, gnu_size); | |
6977 | ||
6978 | /* For negative values, use NEGATE_EXPR of the supplied value. */ | |
6979 | if (tree_int_cst_sgn (gnu_size) < 0) | |
6980 | { | |
6981 | /* The ridiculous code below is to handle the case of the largest | |
6982 | negative integer. */ | |
6983 | tree negative_size = size_diffop (bitsize_zero_node, gnu_size); | |
6984 | bool adjust = false; | |
6985 | tree temp; | |
6986 | ||
6987 | if (TREE_OVERFLOW (negative_size)) | |
6988 | { | |
6989 | negative_size | |
6990 | = size_binop (MINUS_EXPR, bitsize_zero_node, | |
6991 | size_binop (PLUS_EXPR, gnu_size, | |
6992 | bitsize_one_node)); | |
6993 | adjust = true; | |
6994 | } | |
6995 | ||
6996 | temp = build1 (NEGATE_EXPR, bitsizetype, negative_size); | |
6997 | if (adjust) | |
6998 | temp = build2 (MINUS_EXPR, bitsizetype, temp, bitsize_one_node); | |
6999 | ||
7000 | return annotate_value (temp); | |
7001 | } | |
7002 | ||
7003 | if (!host_integerp (gnu_size, 1)) | |
7004 | return No_Uint; | |
7005 | ||
7006 | size = tree_low_cst (gnu_size, 1); | |
7007 | ||
7008 | /* This peculiar test is to make sure that the size fits in an int | |
7009 | on machines where HOST_WIDE_INT is not "int". */ | |
7010 | if (tree_low_cst (gnu_size, 1) == size) | |
7011 | return UI_From_Int (size); | |
7012 | else | |
7013 | return No_Uint; | |
7014 | ||
7015 | case COMPONENT_REF: | |
7016 | /* The only case we handle here is a simple discriminant reference. */ | |
7017 | if (TREE_CODE (TREE_OPERAND (gnu_size, 0)) == PLACEHOLDER_EXPR | |
7018 | && TREE_CODE (TREE_OPERAND (gnu_size, 1)) == FIELD_DECL | |
7019 | && DECL_DISCRIMINANT_NUMBER (TREE_OPERAND (gnu_size, 1))) | |
7020 | return Create_Node (Discrim_Val, | |
7021 | annotate_value (DECL_DISCRIMINANT_NUMBER | |
7022 | (TREE_OPERAND (gnu_size, 1))), | |
7023 | No_Uint, No_Uint); | |
7024 | else | |
7025 | return No_Uint; | |
7026 | ||
7027 | CASE_CONVERT: case NON_LVALUE_EXPR: | |
7028 | return annotate_value (TREE_OPERAND (gnu_size, 0)); | |
7029 | ||
7030 | /* Now just list the operations we handle. */ | |
7031 | case COND_EXPR: tcode = Cond_Expr; break; | |
7032 | case PLUS_EXPR: tcode = Plus_Expr; break; | |
7033 | case MINUS_EXPR: tcode = Minus_Expr; break; | |
7034 | case MULT_EXPR: tcode = Mult_Expr; break; | |
7035 | case TRUNC_DIV_EXPR: tcode = Trunc_Div_Expr; break; | |
7036 | case CEIL_DIV_EXPR: tcode = Ceil_Div_Expr; break; | |
7037 | case FLOOR_DIV_EXPR: tcode = Floor_Div_Expr; break; | |
7038 | case TRUNC_MOD_EXPR: tcode = Trunc_Mod_Expr; break; | |
7039 | case CEIL_MOD_EXPR: tcode = Ceil_Mod_Expr; break; | |
7040 | case FLOOR_MOD_EXPR: tcode = Floor_Mod_Expr; break; | |
7041 | case EXACT_DIV_EXPR: tcode = Exact_Div_Expr; break; | |
7042 | case NEGATE_EXPR: tcode = Negate_Expr; break; | |
7043 | case MIN_EXPR: tcode = Min_Expr; break; | |
7044 | case MAX_EXPR: tcode = Max_Expr; break; | |
7045 | case ABS_EXPR: tcode = Abs_Expr; break; | |
7046 | case TRUTH_ANDIF_EXPR: tcode = Truth_Andif_Expr; break; | |
7047 | case TRUTH_ORIF_EXPR: tcode = Truth_Orif_Expr; break; | |
7048 | case TRUTH_AND_EXPR: tcode = Truth_And_Expr; break; | |
7049 | case TRUTH_OR_EXPR: tcode = Truth_Or_Expr; break; | |
7050 | case TRUTH_XOR_EXPR: tcode = Truth_Xor_Expr; break; | |
7051 | case TRUTH_NOT_EXPR: tcode = Truth_Not_Expr; break; | |
7052 | case BIT_AND_EXPR: tcode = Bit_And_Expr; break; | |
7053 | case LT_EXPR: tcode = Lt_Expr; break; | |
7054 | case LE_EXPR: tcode = Le_Expr; break; | |
7055 | case GT_EXPR: tcode = Gt_Expr; break; | |
7056 | case GE_EXPR: tcode = Ge_Expr; break; | |
7057 | case EQ_EXPR: tcode = Eq_Expr; break; | |
7058 | case NE_EXPR: tcode = Ne_Expr; break; | |
7059 | ||
7060 | default: | |
7061 | return No_Uint; | |
7062 | } | |
7063 | ||
7064 | /* Now get each of the operands that's relevant for this code. If any | |
7065 | cannot be expressed as a repinfo node, say we can't. */ | |
7066 | for (i = 0; i < 3; i++) | |
7067 | ops[i] = No_Uint; | |
7068 | ||
7069 | for (i = 0; i < len; i++) | |
7070 | { | |
7071 | ops[i] = annotate_value (TREE_OPERAND (gnu_size, i)); | |
7072 | if (ops[i] == No_Uint) | |
7073 | return No_Uint; | |
7074 | } | |
7075 | ||
7076 | ret = Create_Node (tcode, ops[0], ops[1], ops[2]); | |
7077 | ||
7078 | /* Save the result in the cache. */ | |
7079 | if (h) | |
7080 | { | |
7081 | *h = GGC_NEW (struct tree_int_map); | |
7082 | (*h)->base.from = gnu_size; | |
7083 | (*h)->to = ret; | |
7084 | } | |
7085 | ||
7086 | return ret; | |
7087 | } | |
7088 | ||
7089 | /* Given GNAT_ENTITY, a record type, and GNU_TYPE, its corresponding | |
7090 | GCC type, set Component_Bit_Offset and Esize to the position and size | |
7091 | used by Gigi. */ | |
7092 | ||
7093 | static void | |
7094 | annotate_rep (Entity_Id gnat_entity, tree gnu_type) | |
7095 | { | |
7096 | tree gnu_list; | |
7097 | tree gnu_entry; | |
7098 | Entity_Id gnat_field; | |
7099 | ||
7100 | /* We operate by first making a list of all fields and their positions | |
7101 | (we can get the sizes easily at any time) by a recursive call | |
7102 | and then update all the sizes into the tree. */ | |
7103 | gnu_list = compute_field_positions (gnu_type, NULL_TREE, | |
7104 | size_zero_node, bitsize_zero_node, | |
7105 | BIGGEST_ALIGNMENT); | |
7106 | ||
7107 | for (gnat_field = First_Entity (gnat_entity); Present (gnat_field); | |
7108 | gnat_field = Next_Entity (gnat_field)) | |
7109 | if ((Ekind (gnat_field) == E_Component | |
7110 | || (Ekind (gnat_field) == E_Discriminant | |
7111 | && !Is_Unchecked_Union (Scope (gnat_field))))) | |
7112 | { | |
7113 | tree parent_offset = bitsize_zero_node; | |
7114 | ||
7115 | gnu_entry = purpose_member (gnat_to_gnu_field_decl (gnat_field), | |
7116 | gnu_list); | |
7117 | ||
7118 | if (gnu_entry) | |
7119 | { | |
7120 | if (type_annotate_only && Is_Tagged_Type (gnat_entity)) | |
7121 | { | |
7122 | /* In this mode the tag and parent components have not been | |
7123 | generated, so we add the appropriate offset to each | |
7124 | component. For a component appearing in the current | |
7125 | extension, the offset is the size of the parent. */ | |
7126 | if (Is_Derived_Type (gnat_entity) | |
7127 | && Original_Record_Component (gnat_field) == gnat_field) | |
7128 | parent_offset | |
7129 | = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))), | |
7130 | bitsizetype); | |
7131 | else | |
7132 | parent_offset = bitsize_int (POINTER_SIZE); | |
7133 | } | |
7134 | ||
7135 | Set_Component_Bit_Offset | |
7136 | (gnat_field, | |
7137 | annotate_value | |
7138 | (size_binop (PLUS_EXPR, | |
7139 | bit_from_pos (TREE_PURPOSE (TREE_VALUE (gnu_entry)), | |
7140 | TREE_VALUE (TREE_VALUE | |
7141 | (TREE_VALUE (gnu_entry)))), | |
7142 | parent_offset))); | |
7143 | ||
7144 | Set_Esize (gnat_field, | |
7145 | annotate_value (DECL_SIZE (TREE_PURPOSE (gnu_entry)))); | |
7146 | } | |
7147 | else if (Is_Tagged_Type (gnat_entity) | |
7148 | && Is_Derived_Type (gnat_entity)) | |
7149 | { | |
7150 | /* If there is no gnu_entry, this is an inherited component whose | |
7151 | position is the same as in the parent type. */ | |
7152 | Set_Component_Bit_Offset | |
7153 | (gnat_field, | |
7154 | Component_Bit_Offset (Original_Record_Component (gnat_field))); | |
7155 | Set_Esize (gnat_field, | |
7156 | Esize (Original_Record_Component (gnat_field))); | |
7157 | } | |
7158 | } | |
7159 | } | |
7160 | ||
7161 | /* Scan all fields in GNU_TYPE and build entries where TREE_PURPOSE is the | |
7162 | FIELD_DECL and TREE_VALUE a TREE_LIST with TREE_PURPOSE being the byte | |
7163 | position and TREE_VALUE being a TREE_LIST with TREE_PURPOSE the value to be | |
7164 | placed into DECL_OFFSET_ALIGN and TREE_VALUE the bit position. GNU_POS is | |
7165 | to be added to the position, GNU_BITPOS to the bit position, OFFSET_ALIGN is | |
7166 | the present value of DECL_OFFSET_ALIGN and GNU_LIST is a list of the entries | |
7167 | so far. */ | |
7168 | ||
7169 | static tree | |
7170 | compute_field_positions (tree gnu_type, tree gnu_list, tree gnu_pos, | |
7171 | tree gnu_bitpos, unsigned int offset_align) | |
7172 | { | |
7173 | tree gnu_field; | |
7174 | tree gnu_result = gnu_list; | |
7175 | ||
7176 | for (gnu_field = TYPE_FIELDS (gnu_type); gnu_field; | |
7177 | gnu_field = TREE_CHAIN (gnu_field)) | |
7178 | { | |
7179 | tree gnu_our_bitpos = size_binop (PLUS_EXPR, gnu_bitpos, | |
7180 | DECL_FIELD_BIT_OFFSET (gnu_field)); | |
7181 | tree gnu_our_offset = size_binop (PLUS_EXPR, gnu_pos, | |
7182 | DECL_FIELD_OFFSET (gnu_field)); | |
7183 | unsigned int our_offset_align | |
7184 | = MIN (offset_align, DECL_OFFSET_ALIGN (gnu_field)); | |
7185 | ||
7186 | gnu_result | |
7187 | = tree_cons (gnu_field, | |
7188 | tree_cons (gnu_our_offset, | |
7189 | tree_cons (size_int (our_offset_align), | |
7190 | gnu_our_bitpos, NULL_TREE), | |
7191 | NULL_TREE), | |
7192 | gnu_result); | |
7193 | ||
7194 | if (DECL_INTERNAL_P (gnu_field)) | |
7195 | gnu_result | |
7196 | = compute_field_positions (TREE_TYPE (gnu_field), gnu_result, | |
7197 | gnu_our_offset, gnu_our_bitpos, | |
7198 | our_offset_align); | |
7199 | } | |
7200 | ||
7201 | return gnu_result; | |
7202 | } | |
7203 | \f | |
7204 | /* UINT_SIZE is a Uint giving the specified size for an object of GNU_TYPE | |
7205 | corresponding to GNAT_OBJECT. If size is valid, return a tree corresponding | |
7206 | to its value. Otherwise return 0. KIND is VAR_DECL is we are specifying | |
7207 | the size for an object, TYPE_DECL for the size of a type, and FIELD_DECL | |
7208 | for the size of a field. COMPONENT_P is true if we are being called | |
7209 | to process the Component_Size of GNAT_OBJECT. This is used for error | |
7210 | message handling and to indicate to use the object size of GNU_TYPE. | |
7211 | ZERO_OK is true if a size of zero is permitted; if ZERO_OK is false, | |
7212 | it means that a size of zero should be treated as an unspecified size. */ | |
7213 | ||
7214 | static tree | |
7215 | validate_size (Uint uint_size, tree gnu_type, Entity_Id gnat_object, | |
7216 | enum tree_code kind, bool component_p, bool zero_ok) | |
7217 | { | |
7218 | Node_Id gnat_error_node; | |
7219 | tree type_size, size; | |
7220 | ||
7221 | if (kind == VAR_DECL | |
7222 | /* If a type needs strict alignment, a component of this type in | |
7223 | a packed record cannot be packed and thus uses the type size. */ | |
7224 | || (kind == TYPE_DECL && Strict_Alignment (gnat_object))) | |
7225 | type_size = TYPE_SIZE (gnu_type); | |
7226 | else | |
7227 | type_size = rm_size (gnu_type); | |
7228 | ||
7229 | /* Find the node to use for errors. */ | |
7230 | if ((Ekind (gnat_object) == E_Component | |
7231 | || Ekind (gnat_object) == E_Discriminant) | |
7232 | && Present (Component_Clause (gnat_object))) | |
7233 | gnat_error_node = Last_Bit (Component_Clause (gnat_object)); | |
7234 | else if (Present (Size_Clause (gnat_object))) | |
7235 | gnat_error_node = Expression (Size_Clause (gnat_object)); | |
7236 | else | |
7237 | gnat_error_node = gnat_object; | |
7238 | ||
a002cb99 | 7239 | /* Return 0 if no size was specified, either because Esize was not Present |
7240 | or the specified size was zero. */ | |
27becfc8 | 7241 | if (No (uint_size) || uint_size == No_Uint) |
7242 | return NULL_TREE; | |
7243 | ||
a002cb99 | 7244 | /* Get the size as a tree. Issue an error if a size was specified but |
7245 | cannot be represented in sizetype. */ | |
27becfc8 | 7246 | size = UI_To_gnu (uint_size, bitsizetype); |
7247 | if (TREE_OVERFLOW (size)) | |
7248 | { | |
7249 | post_error_ne (component_p ? "component size of & is too large" | |
7250 | : "size of & is too large", | |
7251 | gnat_error_node, gnat_object); | |
7252 | return NULL_TREE; | |
7253 | } | |
7254 | ||
7255 | /* Ignore a negative size since that corresponds to our back-annotation. | |
a002cb99 | 7256 | Also ignore a zero size if it is not permitted. */ |
7257 | if (tree_int_cst_sgn (size) < 0 || (integer_zerop (size) && !zero_ok)) | |
27becfc8 | 7258 | return NULL_TREE; |
7259 | ||
7260 | /* The size of objects is always a multiple of a byte. */ | |
7261 | if (kind == VAR_DECL | |
7262 | && !integer_zerop (size_binop (TRUNC_MOD_EXPR, size, bitsize_unit_node))) | |
7263 | { | |
7264 | if (component_p) | |
7265 | post_error_ne ("component size for& is not a multiple of Storage_Unit", | |
7266 | gnat_error_node, gnat_object); | |
7267 | else | |
7268 | post_error_ne ("size for& is not a multiple of Storage_Unit", | |
7269 | gnat_error_node, gnat_object); | |
7270 | return NULL_TREE; | |
7271 | } | |
7272 | ||
7273 | /* If this is an integral type or a packed array type, the front-end has | |
7274 | verified the size, so we need not do it here (which would entail | |
a002cb99 | 7275 | checking against the bounds). However, if this is an aliased object, |
7276 | it may not be smaller than the type of the object. */ | |
27becfc8 | 7277 | if ((INTEGRAL_TYPE_P (gnu_type) || TYPE_IS_PACKED_ARRAY_TYPE_P (gnu_type)) |
7278 | && !(kind == VAR_DECL && Is_Aliased (gnat_object))) | |
7279 | return size; | |
7280 | ||
7281 | /* If the object is a record that contains a template, add the size of | |
7282 | the template to the specified size. */ | |
7283 | if (TREE_CODE (gnu_type) == RECORD_TYPE | |
7284 | && TYPE_CONTAINS_TEMPLATE_P (gnu_type)) | |
7285 | size = size_binop (PLUS_EXPR, DECL_SIZE (TYPE_FIELDS (gnu_type)), size); | |
7286 | ||
7287 | /* Modify the size of the type to be that of the maximum size if it has a | |
7288 | discriminant. */ | |
7289 | if (type_size && CONTAINS_PLACEHOLDER_P (type_size)) | |
7290 | type_size = max_size (type_size, true); | |
7291 | ||
7292 | /* If this is an access type or a fat pointer, the minimum size is that given | |
7293 | by the smallest integral mode that's valid for pointers. */ | |
7294 | if ((TREE_CODE (gnu_type) == POINTER_TYPE) || TYPE_FAT_POINTER_P (gnu_type)) | |
7295 | { | |
7296 | enum machine_mode p_mode; | |
7297 | ||
7298 | for (p_mode = GET_CLASS_NARROWEST_MODE (MODE_INT); | |
7299 | !targetm.valid_pointer_mode (p_mode); | |
7300 | p_mode = GET_MODE_WIDER_MODE (p_mode)) | |
7301 | ; | |
7302 | ||
7303 | type_size = bitsize_int (GET_MODE_BITSIZE (p_mode)); | |
7304 | } | |
7305 | ||
7306 | /* If the size of the object is a constant, the new size must not be | |
7307 | smaller. */ | |
7308 | if (TREE_CODE (type_size) != INTEGER_CST | |
7309 | || TREE_OVERFLOW (type_size) | |
7310 | || tree_int_cst_lt (size, type_size)) | |
7311 | { | |
7312 | if (component_p) | |
7313 | post_error_ne_tree | |
7314 | ("component size for& too small{, minimum allowed is ^}", | |
7315 | gnat_error_node, gnat_object, type_size); | |
7316 | else | |
7317 | post_error_ne_tree ("size for& too small{, minimum allowed is ^}", | |
7318 | gnat_error_node, gnat_object, type_size); | |
7319 | ||
7320 | if (kind == VAR_DECL && !component_p | |
7321 | && TREE_CODE (rm_size (gnu_type)) == INTEGER_CST | |
7322 | && !tree_int_cst_lt (size, rm_size (gnu_type))) | |
7323 | post_error_ne_tree_2 | |
7324 | ("\\size of ^ is not a multiple of alignment (^ bits)", | |
7325 | gnat_error_node, gnat_object, rm_size (gnu_type), | |
7326 | TYPE_ALIGN (gnu_type)); | |
7327 | ||
7328 | else if (INTEGRAL_TYPE_P (gnu_type)) | |
7329 | post_error_ne ("\\size would be legal if & were not aliased!", | |
7330 | gnat_error_node, gnat_object); | |
7331 | ||
7332 | return NULL_TREE; | |
7333 | } | |
7334 | ||
7335 | return size; | |
7336 | } | |
7337 | \f | |
153edb51 | 7338 | /* Similarly, but both validate and process a value of RM size. This |
27becfc8 | 7339 | routine is only called for types. */ |
7340 | ||
7341 | static void | |
7342 | set_rm_size (Uint uint_size, tree gnu_type, Entity_Id gnat_entity) | |
7343 | { | |
a002cb99 | 7344 | /* Only issue an error if a Value_Size clause was explicitly given. |
27becfc8 | 7345 | Otherwise, we'd be duplicating an error on the Size clause. */ |
7346 | Node_Id gnat_attr_node | |
7347 | = Get_Attribute_Definition_Clause (gnat_entity, Attr_Value_Size); | |
a002cb99 | 7348 | tree old_size = rm_size (gnu_type), size; |
27becfc8 | 7349 | |
a002cb99 | 7350 | /* Do nothing if no size was specified, either because RM size was not |
7351 | Present or if the specified size was zero. */ | |
27becfc8 | 7352 | if (No (uint_size) || uint_size == No_Uint) |
7353 | return; | |
7354 | ||
a002cb99 | 7355 | /* Get the size as a tree. Issue an error if a size was specified but |
7356 | cannot be represented in sizetype. */ | |
27becfc8 | 7357 | size = UI_To_gnu (uint_size, bitsizetype); |
7358 | if (TREE_OVERFLOW (size)) | |
7359 | { | |
7360 | if (Present (gnat_attr_node)) | |
7361 | post_error_ne ("Value_Size of & is too large", gnat_attr_node, | |
7362 | gnat_entity); | |
27becfc8 | 7363 | return; |
7364 | } | |
7365 | ||
7366 | /* Ignore a negative size since that corresponds to our back-annotation. | |
a002cb99 | 7367 | Also ignore a zero size unless a Value_Size clause exists, or a size |
7368 | clause exists, or this is an integer type, in which case the front-end | |
7369 | will have always set it. */ | |
7370 | if (tree_int_cst_sgn (size) < 0 | |
7371 | || (integer_zerop (size) | |
7372 | && No (gnat_attr_node) | |
7373 | && !Has_Size_Clause (gnat_entity) | |
7374 | && !Is_Discrete_Or_Fixed_Point_Type (gnat_entity))) | |
27becfc8 | 7375 | return; |
7376 | ||
7377 | /* If the old size is self-referential, get the maximum size. */ | |
7378 | if (CONTAINS_PLACEHOLDER_P (old_size)) | |
7379 | old_size = max_size (old_size, true); | |
7380 | ||
7381 | /* If the size of the object is a constant, the new size must not be | |
a002cb99 | 7382 | smaller (the front-end checks this for scalar types). */ |
27becfc8 | 7383 | if (TREE_CODE (old_size) != INTEGER_CST |
7384 | || TREE_OVERFLOW (old_size) | |
a002cb99 | 7385 | || (AGGREGATE_TYPE_P (gnu_type) && tree_int_cst_lt (size, old_size))) |
27becfc8 | 7386 | { |
7387 | if (Present (gnat_attr_node)) | |
7388 | post_error_ne_tree | |
7389 | ("Value_Size for& too small{, minimum allowed is ^}", | |
7390 | gnat_attr_node, gnat_entity, old_size); | |
27becfc8 | 7391 | return; |
7392 | } | |
7393 | ||
38f9a450 | 7394 | /* Otherwise, set the RM size proper for integral types... */ |
153edb51 | 7395 | if ((TREE_CODE (gnu_type) == INTEGER_TYPE |
7396 | && Is_Discrete_Or_Fixed_Point_Type (gnat_entity)) | |
7397 | || (TREE_CODE (gnu_type) == ENUMERAL_TYPE | |
7398 | || TREE_CODE (gnu_type) == BOOLEAN_TYPE)) | |
a9538d68 | 7399 | SET_TYPE_RM_SIZE (gnu_type, size); |
153edb51 | 7400 | |
7401 | /* ...or the Ada size for record and union types. */ | |
27becfc8 | 7402 | else if ((TREE_CODE (gnu_type) == RECORD_TYPE |
7403 | || TREE_CODE (gnu_type) == UNION_TYPE | |
7404 | || TREE_CODE (gnu_type) == QUAL_UNION_TYPE) | |
7405 | && !TYPE_IS_FAT_POINTER_P (gnu_type)) | |
7406 | SET_TYPE_ADA_SIZE (gnu_type, size); | |
7407 | } | |
7408 | \f | |
7409 | /* Given a type TYPE, return a new type whose size is appropriate for SIZE. | |
7410 | If TYPE is the best type, return it. Otherwise, make a new type. We | |
32826d65 | 7411 | only support new integral and pointer types. FOR_BIASED is true if |
27becfc8 | 7412 | we are making a biased type. */ |
7413 | ||
7414 | static tree | |
7415 | make_type_from_size (tree type, tree size_tree, bool for_biased) | |
7416 | { | |
7417 | unsigned HOST_WIDE_INT size; | |
27c3efc2 | 7418 | bool biased_p; |
27becfc8 | 7419 | tree new_type; |
7420 | ||
7421 | /* If size indicates an error, just return TYPE to avoid propagating | |
7422 | the error. Likewise if it's too large to represent. */ | |
7423 | if (!size_tree || !host_integerp (size_tree, 1)) | |
7424 | return type; | |
7425 | ||
7426 | size = tree_low_cst (size_tree, 1); | |
7427 | ||
7428 | switch (TREE_CODE (type)) | |
7429 | { | |
7430 | case INTEGER_TYPE: | |
7431 | case ENUMERAL_TYPE: | |
69c2baa9 | 7432 | case BOOLEAN_TYPE: |
27becfc8 | 7433 | biased_p = (TREE_CODE (type) == INTEGER_TYPE |
7434 | && TYPE_BIASED_REPRESENTATION_P (type)); | |
7435 | ||
7436 | /* Only do something if the type is not a packed array type and | |
7437 | doesn't already have the proper size. */ | |
7438 | if (TYPE_PACKED_ARRAY_TYPE_P (type) | |
27c3efc2 | 7439 | || (TYPE_PRECISION (type) == size && biased_p == for_biased)) |
27becfc8 | 7440 | break; |
7441 | ||
7442 | biased_p |= for_biased; | |
4880a940 | 7443 | if (size > LONG_LONG_TYPE_SIZE) |
7444 | size = LONG_LONG_TYPE_SIZE; | |
27becfc8 | 7445 | |
7446 | if (TYPE_UNSIGNED (type) || biased_p) | |
7447 | new_type = make_unsigned_type (size); | |
7448 | else | |
7449 | new_type = make_signed_type (size); | |
7450 | TREE_TYPE (new_type) = TREE_TYPE (type) ? TREE_TYPE (type) : type; | |
a9538d68 | 7451 | SET_TYPE_RM_MIN_VALUE (new_type, |
7452 | convert (TREE_TYPE (new_type), | |
7453 | TYPE_MIN_VALUE (type))); | |
7454 | SET_TYPE_RM_MAX_VALUE (new_type, | |
7455 | convert (TREE_TYPE (new_type), | |
7456 | TYPE_MAX_VALUE (type))); | |
98fa7d23 | 7457 | /* Propagate the name to avoid creating a fake subrange type. */ |
7458 | if (TYPE_NAME (type)) | |
7459 | { | |
7460 | if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL) | |
7461 | TYPE_NAME (new_type) = DECL_NAME (TYPE_NAME (type)); | |
7462 | else | |
7463 | TYPE_NAME (new_type) = TYPE_NAME (type); | |
7464 | } | |
27becfc8 | 7465 | TYPE_BIASED_REPRESENTATION_P (new_type) = biased_p; |
a9538d68 | 7466 | SET_TYPE_RM_SIZE (new_type, bitsize_int (size)); |
27becfc8 | 7467 | return new_type; |
7468 | ||
7469 | case RECORD_TYPE: | |
7470 | /* Do something if this is a fat pointer, in which case we | |
7471 | may need to return the thin pointer. */ | |
7472 | if (TYPE_IS_FAT_POINTER_P (type) && size < POINTER_SIZE * 2) | |
dc3276a2 | 7473 | { |
7474 | enum machine_mode p_mode = mode_for_size (size, MODE_INT, 0); | |
7475 | if (!targetm.valid_pointer_mode (p_mode)) | |
7476 | p_mode = ptr_mode; | |
7477 | return | |
7478 | build_pointer_type_for_mode | |
7479 | (TYPE_OBJECT_RECORD_TYPE (TYPE_UNCONSTRAINED_ARRAY (type)), | |
7480 | p_mode, 0); | |
7481 | } | |
27becfc8 | 7482 | break; |
7483 | ||
7484 | case POINTER_TYPE: | |
7485 | /* Only do something if this is a thin pointer, in which case we | |
7486 | may need to return the fat pointer. */ | |
7487 | if (TYPE_THIN_POINTER_P (type) && size >= POINTER_SIZE * 2) | |
7488 | return | |
7489 | build_pointer_type (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type))); | |
7490 | break; | |
7491 | ||
7492 | default: | |
7493 | break; | |
7494 | } | |
7495 | ||
7496 | return type; | |
7497 | } | |
7498 | \f | |
7499 | /* ALIGNMENT is a Uint giving the alignment specified for GNAT_ENTITY, | |
7500 | a type or object whose present alignment is ALIGN. If this alignment is | |
7501 | valid, return it. Otherwise, give an error and return ALIGN. */ | |
7502 | ||
7503 | static unsigned int | |
7504 | validate_alignment (Uint alignment, Entity_Id gnat_entity, unsigned int align) | |
7505 | { | |
7506 | unsigned int max_allowed_alignment = get_target_maximum_allowed_alignment (); | |
7507 | unsigned int new_align; | |
7508 | Node_Id gnat_error_node; | |
7509 | ||
7510 | /* Don't worry about checking alignment if alignment was not specified | |
7511 | by the source program and we already posted an error for this entity. */ | |
7512 | if (Error_Posted (gnat_entity) && !Has_Alignment_Clause (gnat_entity)) | |
7513 | return align; | |
7514 | ||
7515 | /* Post the error on the alignment clause if any. */ | |
7516 | if (Present (Alignment_Clause (gnat_entity))) | |
7517 | gnat_error_node = Expression (Alignment_Clause (gnat_entity)); | |
7518 | else | |
7519 | gnat_error_node = gnat_entity; | |
7520 | ||
7521 | /* Within GCC, an alignment is an integer, so we must make sure a value is | |
7522 | specified that fits in that range. Also, there is an upper bound to | |
7523 | alignments we can support/allow. */ | |
7524 | if (!UI_Is_In_Int_Range (alignment) | |
7525 | || ((new_align = UI_To_Int (alignment)) > max_allowed_alignment)) | |
7526 | post_error_ne_num ("largest supported alignment for& is ^", | |
7527 | gnat_error_node, gnat_entity, max_allowed_alignment); | |
7528 | else if (!(Present (Alignment_Clause (gnat_entity)) | |
7529 | && From_At_Mod (Alignment_Clause (gnat_entity))) | |
7530 | && new_align * BITS_PER_UNIT < align) | |
d4b7e0f5 | 7531 | { |
7532 | unsigned int double_align; | |
7533 | bool is_capped_double, align_clause; | |
7534 | ||
7535 | /* If the default alignment of "double" or larger scalar types is | |
7536 | specifically capped and the new alignment is above the cap, do | |
7537 | not post an error and change the alignment only if there is an | |
7538 | alignment clause; this makes it possible to have the associated | |
7539 | GCC type overaligned by default for performance reasons. */ | |
7540 | if ((double_align = double_float_alignment) > 0) | |
7541 | { | |
7542 | Entity_Id gnat_type | |
7543 | = Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity); | |
7544 | is_capped_double | |
7545 | = is_double_float_or_array (gnat_type, &align_clause); | |
7546 | } | |
7547 | else if ((double_align = double_scalar_alignment) > 0) | |
7548 | { | |
7549 | Entity_Id gnat_type | |
7550 | = Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity); | |
7551 | is_capped_double | |
7552 | = is_double_scalar_or_array (gnat_type, &align_clause); | |
7553 | } | |
7554 | else | |
7555 | is_capped_double = align_clause = false; | |
7556 | ||
7557 | if (is_capped_double && new_align >= double_align) | |
7558 | { | |
7559 | if (align_clause) | |
7560 | align = new_align * BITS_PER_UNIT; | |
7561 | } | |
7562 | else | |
7563 | { | |
7564 | if (is_capped_double) | |
7565 | align = double_align * BITS_PER_UNIT; | |
7566 | ||
7567 | post_error_ne_num ("alignment for& must be at least ^", | |
7568 | gnat_error_node, gnat_entity, | |
7569 | align / BITS_PER_UNIT); | |
7570 | } | |
7571 | } | |
27becfc8 | 7572 | else |
7573 | { | |
7574 | new_align = (new_align > 0 ? new_align * BITS_PER_UNIT : 1); | |
7575 | if (new_align > align) | |
7576 | align = new_align; | |
7577 | } | |
7578 | ||
7579 | return align; | |
7580 | } | |
7581 | ||
7582 | /* Return the smallest alignment not less than SIZE. */ | |
7583 | ||
7584 | static unsigned int | |
7585 | ceil_alignment (unsigned HOST_WIDE_INT size) | |
7586 | { | |
7587 | return (unsigned int) 1 << (floor_log2 (size - 1) + 1); | |
7588 | } | |
7589 | \f | |
7590 | /* Verify that OBJECT, a type or decl, is something we can implement | |
7591 | atomically. If not, give an error for GNAT_ENTITY. COMP_P is true | |
7592 | if we require atomic components. */ | |
7593 | ||
7594 | static void | |
7595 | check_ok_for_atomic (tree object, Entity_Id gnat_entity, bool comp_p) | |
7596 | { | |
7597 | Node_Id gnat_error_point = gnat_entity; | |
7598 | Node_Id gnat_node; | |
7599 | enum machine_mode mode; | |
7600 | unsigned int align; | |
7601 | tree size; | |
7602 | ||
7603 | /* There are three case of what OBJECT can be. It can be a type, in which | |
7604 | case we take the size, alignment and mode from the type. It can be a | |
7605 | declaration that was indirect, in which case the relevant values are | |
7606 | that of the type being pointed to, or it can be a normal declaration, | |
7607 | in which case the values are of the decl. The code below assumes that | |
7608 | OBJECT is either a type or a decl. */ | |
7609 | if (TYPE_P (object)) | |
7610 | { | |
7611 | mode = TYPE_MODE (object); | |
7612 | align = TYPE_ALIGN (object); | |
7613 | size = TYPE_SIZE (object); | |
7614 | } | |
7615 | else if (DECL_BY_REF_P (object)) | |
7616 | { | |
7617 | mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (object))); | |
7618 | align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (object))); | |
7619 | size = TYPE_SIZE (TREE_TYPE (TREE_TYPE (object))); | |
7620 | } | |
7621 | else | |
7622 | { | |
7623 | mode = DECL_MODE (object); | |
7624 | align = DECL_ALIGN (object); | |
7625 | size = DECL_SIZE (object); | |
7626 | } | |
7627 | ||
7628 | /* Consider all floating-point types atomic and any types that that are | |
7629 | represented by integers no wider than a machine word. */ | |
7630 | if (GET_MODE_CLASS (mode) == MODE_FLOAT | |
7631 | || ((GET_MODE_CLASS (mode) == MODE_INT | |
7632 | || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT) | |
7633 | && GET_MODE_BITSIZE (mode) <= BITS_PER_WORD)) | |
7634 | return; | |
7635 | ||
7636 | /* For the moment, also allow anything that has an alignment equal | |
7637 | to its size and which is smaller than a word. */ | |
7638 | if (size && TREE_CODE (size) == INTEGER_CST | |
7639 | && compare_tree_int (size, align) == 0 | |
7640 | && align <= BITS_PER_WORD) | |
7641 | return; | |
7642 | ||
7643 | for (gnat_node = First_Rep_Item (gnat_entity); Present (gnat_node); | |
7644 | gnat_node = Next_Rep_Item (gnat_node)) | |
7645 | { | |
7646 | if (!comp_p && Nkind (gnat_node) == N_Pragma | |
7647 | && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node))) | |
7648 | == Pragma_Atomic)) | |
7649 | gnat_error_point = First (Pragma_Argument_Associations (gnat_node)); | |
7650 | else if (comp_p && Nkind (gnat_node) == N_Pragma | |
7651 | && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node))) | |
7652 | == Pragma_Atomic_Components)) | |
7653 | gnat_error_point = First (Pragma_Argument_Associations (gnat_node)); | |
7654 | } | |
7655 | ||
7656 | if (comp_p) | |
7657 | post_error_ne ("atomic access to component of & cannot be guaranteed", | |
7658 | gnat_error_point, gnat_entity); | |
7659 | else | |
7660 | post_error_ne ("atomic access to & cannot be guaranteed", | |
7661 | gnat_error_point, gnat_entity); | |
7662 | } | |
7663 | \f | |
7664 | /* Check if FTYPE1 and FTYPE2, two potentially different function type nodes, | |
7665 | have compatible signatures so that a call using one type may be safely | |
ea5ec53d | 7666 | issued if the actual target function type is the other. Return 1 if it is |
27becfc8 | 7667 | the case, 0 otherwise, and post errors on the incompatibilities. |
7668 | ||
7669 | This is used when an Ada subprogram is mapped onto a GCC builtin, to ensure | |
7670 | that calls to the subprogram will have arguments suitable for the later | |
7671 | underlying builtin expansion. */ | |
7672 | ||
7673 | static int | |
7674 | compatible_signatures_p (tree ftype1, tree ftype2) | |
7675 | { | |
7676 | /* As of now, we only perform very trivial tests and consider it's the | |
7677 | programmer's responsibility to ensure the type correctness in the Ada | |
7678 | declaration, as in the regular Import cases. | |
7679 | ||
7680 | Mismatches typically result in either error messages from the builtin | |
7681 | expander, internal compiler errors, or in a real call sequence. This | |
7682 | should be refined to issue diagnostics helping error detection and | |
7683 | correction. */ | |
7684 | ||
7685 | /* Almost fake test, ensuring a use of each argument. */ | |
7686 | if (ftype1 == ftype2) | |
7687 | return 1; | |
7688 | ||
7689 | return 1; | |
7690 | } | |
7691 | \f | |
8382e2a2 | 7692 | /* Given a type T, a FIELD_DECL F, and a replacement value R, return a |
7693 | type with all size expressions that contain F in a PLACEHOLDER_EXPR | |
7694 | updated by replacing F with R. | |
7695 | ||
7696 | The function doesn't update the layout of the type, i.e. it assumes | |
7697 | that the substitution is purely formal. That's why the replacement | |
7698 | value R must itself contain a PLACEHOLDER_EXPR. */ | |
27becfc8 | 7699 | |
7700 | tree | |
7701 | substitute_in_type (tree t, tree f, tree r) | |
7702 | { | |
8382e2a2 | 7703 | tree new; |
7704 | ||
7705 | gcc_assert (CONTAINS_PLACEHOLDER_P (r)); | |
27becfc8 | 7706 | |
7707 | switch (TREE_CODE (t)) | |
7708 | { | |
7709 | case INTEGER_TYPE: | |
7710 | case ENUMERAL_TYPE: | |
7711 | case BOOLEAN_TYPE: | |
dd02c1ab | 7712 | case REAL_TYPE: |
a9538d68 | 7713 | |
7714 | /* First the domain types of arrays. */ | |
7715 | if (CONTAINS_PLACEHOLDER_P (TYPE_GCC_MIN_VALUE (t)) | |
7716 | || CONTAINS_PLACEHOLDER_P (TYPE_GCC_MAX_VALUE (t))) | |
27becfc8 | 7717 | { |
a9538d68 | 7718 | tree low = SUBSTITUTE_IN_EXPR (TYPE_GCC_MIN_VALUE (t), f, r); |
7719 | tree high = SUBSTITUTE_IN_EXPR (TYPE_GCC_MAX_VALUE (t), f, r); | |
27becfc8 | 7720 | |
a9538d68 | 7721 | if (low == TYPE_GCC_MIN_VALUE (t) && high == TYPE_GCC_MAX_VALUE (t)) |
27becfc8 | 7722 | return t; |
7723 | ||
211df513 | 7724 | new = copy_type (t); |
a9538d68 | 7725 | TYPE_GCC_MIN_VALUE (new) = low; |
7726 | TYPE_GCC_MAX_VALUE (new) = high; | |
dd02c1ab | 7727 | |
7728 | if (TREE_CODE (t) == INTEGER_TYPE && TYPE_INDEX_TYPE (t)) | |
27becfc8 | 7729 | SET_TYPE_INDEX_TYPE |
7730 | (new, substitute_in_type (TYPE_INDEX_TYPE (t), f, r)); | |
27becfc8 | 7731 | |
8382e2a2 | 7732 | return new; |
27becfc8 | 7733 | } |
8382e2a2 | 7734 | |
a9538d68 | 7735 | /* Then the subtypes. */ |
7736 | if (CONTAINS_PLACEHOLDER_P (TYPE_RM_MIN_VALUE (t)) | |
7737 | || CONTAINS_PLACEHOLDER_P (TYPE_RM_MAX_VALUE (t))) | |
7738 | { | |
7739 | tree low = SUBSTITUTE_IN_EXPR (TYPE_RM_MIN_VALUE (t), f, r); | |
7740 | tree high = SUBSTITUTE_IN_EXPR (TYPE_RM_MAX_VALUE (t), f, r); | |
7741 | ||
7742 | if (low == TYPE_RM_MIN_VALUE (t) && high == TYPE_RM_MAX_VALUE (t)) | |
7743 | return t; | |
7744 | ||
7745 | new = copy_type (t); | |
7746 | SET_TYPE_RM_MIN_VALUE (new, low); | |
7747 | SET_TYPE_RM_MAX_VALUE (new, high); | |
7748 | ||
7749 | return new; | |
7750 | } | |
7751 | ||
27becfc8 | 7752 | return t; |
7753 | ||
7754 | case COMPLEX_TYPE: | |
8382e2a2 | 7755 | new = substitute_in_type (TREE_TYPE (t), f, r); |
7756 | if (new == TREE_TYPE (t)) | |
27becfc8 | 7757 | return t; |
7758 | ||
8382e2a2 | 7759 | return build_complex_type (new); |
27becfc8 | 7760 | |
7761 | case OFFSET_TYPE: | |
7762 | case METHOD_TYPE: | |
7763 | case FUNCTION_TYPE: | |
7764 | case LANG_TYPE: | |
8382e2a2 | 7765 | /* These should never show up here. */ |
27becfc8 | 7766 | gcc_unreachable (); |
7767 | ||
7768 | case ARRAY_TYPE: | |
7769 | { | |
7770 | tree component = substitute_in_type (TREE_TYPE (t), f, r); | |
7771 | tree domain = substitute_in_type (TYPE_DOMAIN (t), f, r); | |
7772 | ||
7773 | if (component == TREE_TYPE (t) && domain == TYPE_DOMAIN (t)) | |
7774 | return t; | |
7775 | ||
7776 | new = build_array_type (component, domain); | |
8382e2a2 | 7777 | TYPE_ALIGN (new) = TYPE_ALIGN (t); |
7778 | TYPE_USER_ALIGN (new) = TYPE_USER_ALIGN (t); | |
7779 | SET_TYPE_MODE (new, TYPE_MODE (t)); | |
7780 | TYPE_SIZE (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r); | |
7781 | TYPE_SIZE_UNIT (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r); | |
9c843fa0 | 7782 | TYPE_NONALIASED_COMPONENT (new) = TYPE_NONALIASED_COMPONENT (t); |
27becfc8 | 7783 | TYPE_MULTI_ARRAY_P (new) = TYPE_MULTI_ARRAY_P (t); |
7784 | TYPE_CONVENTION_FORTRAN_P (new) = TYPE_CONVENTION_FORTRAN_P (t); | |
27becfc8 | 7785 | return new; |
7786 | } | |
7787 | ||
7788 | case RECORD_TYPE: | |
7789 | case UNION_TYPE: | |
7790 | case QUAL_UNION_TYPE: | |
7791 | { | |
8382e2a2 | 7792 | bool changed_field = false; |
27becfc8 | 7793 | tree field; |
27becfc8 | 7794 | |
7795 | /* Start out with no fields, make new fields, and chain them | |
7796 | in. If we haven't actually changed the type of any field, | |
7797 | discard everything we've done and return the old type. */ | |
8382e2a2 | 7798 | new = copy_type (t); |
27becfc8 | 7799 | TYPE_FIELDS (new) = NULL_TREE; |
27becfc8 | 7800 | |
7801 | for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field)) | |
7802 | { | |
8382e2a2 | 7803 | tree new_field = copy_node (field), new_n; |
7804 | ||
7805 | new_n = substitute_in_type (TREE_TYPE (field), f, r); | |
7806 | if (new_n != TREE_TYPE (field)) | |
27becfc8 | 7807 | { |
8382e2a2 | 7808 | TREE_TYPE (new_field) = new_n; |
7809 | changed_field = true; | |
7810 | } | |
27becfc8 | 7811 | |
8382e2a2 | 7812 | new_n = SUBSTITUTE_IN_EXPR (DECL_FIELD_OFFSET (field), f, r); |
7813 | if (new_n != DECL_FIELD_OFFSET (field)) | |
7814 | { | |
7815 | DECL_FIELD_OFFSET (new_field) = new_n; | |
7816 | changed_field = true; | |
7817 | } | |
27becfc8 | 7818 | |
8382e2a2 | 7819 | /* Do the substitution inside the qualifier, if any. */ |
7820 | if (TREE_CODE (t) == QUAL_UNION_TYPE) | |
7821 | { | |
7822 | new_n = SUBSTITUTE_IN_EXPR (DECL_QUALIFIER (field), f, r); | |
7823 | if (new_n != DECL_QUALIFIER (field)) | |
7824 | { | |
7825 | DECL_QUALIFIER (new_field) = new_n; | |
7826 | changed_field = true; | |
27becfc8 | 7827 | } |
7828 | } | |
7829 | ||
7830 | DECL_CONTEXT (new_field) = new; | |
7831 | SET_DECL_ORIGINAL_FIELD (new_field, | |
7832 | (DECL_ORIGINAL_FIELD (field) | |
7833 | ? DECL_ORIGINAL_FIELD (field) : field)); | |
7834 | ||
8382e2a2 | 7835 | TREE_CHAIN (new_field) = TYPE_FIELDS (new); |
7836 | TYPE_FIELDS (new) = new_field; | |
27becfc8 | 7837 | } |
7838 | ||
8382e2a2 | 7839 | if (!changed_field) |
27becfc8 | 7840 | return t; |
7841 | ||
8382e2a2 | 7842 | TYPE_FIELDS (new) = nreverse (TYPE_FIELDS (new)); |
7843 | TYPE_SIZE (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r); | |
7844 | TYPE_SIZE_UNIT (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r); | |
7845 | SET_TYPE_ADA_SIZE (new, SUBSTITUTE_IN_EXPR (TYPE_ADA_SIZE (t), f, r)); | |
27becfc8 | 7846 | return new; |
7847 | } | |
7848 | ||
7849 | default: | |
7850 | return t; | |
7851 | } | |
7852 | } | |
7853 | \f | |
153edb51 | 7854 | /* Return the RM size of GNU_TYPE. This is the actual number of bits |
27becfc8 | 7855 | needed to represent the object. */ |
7856 | ||
7857 | tree | |
7858 | rm_size (tree gnu_type) | |
7859 | { | |
38f9a450 | 7860 | /* For integral types, we store the RM size explicitly. */ |
27becfc8 | 7861 | if (INTEGRAL_TYPE_P (gnu_type) && TYPE_RM_SIZE (gnu_type)) |
7862 | return TYPE_RM_SIZE (gnu_type); | |
153edb51 | 7863 | |
7864 | /* Return the RM size of the actual data plus the size of the template. */ | |
7865 | if (TREE_CODE (gnu_type) == RECORD_TYPE | |
7866 | && TYPE_CONTAINS_TEMPLATE_P (gnu_type)) | |
27becfc8 | 7867 | return |
7868 | size_binop (PLUS_EXPR, | |
7869 | rm_size (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)))), | |
7870 | DECL_SIZE (TYPE_FIELDS (gnu_type))); | |
153edb51 | 7871 | |
7872 | /* For record types, we store the size explicitly. */ | |
7873 | if ((TREE_CODE (gnu_type) == RECORD_TYPE | |
7874 | || TREE_CODE (gnu_type) == UNION_TYPE | |
7875 | || TREE_CODE (gnu_type) == QUAL_UNION_TYPE) | |
7876 | && !TYPE_IS_FAT_POINTER_P (gnu_type) | |
7877 | && TYPE_ADA_SIZE (gnu_type)) | |
27becfc8 | 7878 | return TYPE_ADA_SIZE (gnu_type); |
153edb51 | 7879 | |
7880 | /* For other types, this is just the size. */ | |
7881 | return TYPE_SIZE (gnu_type); | |
27becfc8 | 7882 | } |
7883 | \f | |
e3698827 | 7884 | /* Return the name to be used for GNAT_ENTITY. If a type, create a |
7885 | fully-qualified name, possibly with type information encoding. | |
7886 | Otherwise, return the name. */ | |
7887 | ||
7888 | tree | |
7889 | get_entity_name (Entity_Id gnat_entity) | |
7890 | { | |
7891 | Get_Encoded_Name (gnat_entity); | |
7892 | return get_identifier_with_length (Name_Buffer, Name_Len); | |
7893 | } | |
7894 | ||
27becfc8 | 7895 | /* Return an identifier representing the external name to be used for |
7896 | GNAT_ENTITY. If SUFFIX is specified, the name is followed by "___" | |
7897 | and the specified suffix. */ | |
7898 | ||
7899 | tree | |
7900 | create_concat_name (Entity_Id gnat_entity, const char *suffix) | |
7901 | { | |
7902 | Entity_Kind kind = Ekind (gnat_entity); | |
7903 | ||
e3698827 | 7904 | if (suffix) |
7905 | { | |
7906 | String_Template temp = {1, strlen (suffix)}; | |
7907 | Fat_Pointer fp = {suffix, &temp}; | |
7908 | Get_External_Name_With_Suffix (gnat_entity, fp); | |
7909 | } | |
7910 | else | |
7911 | Get_External_Name (gnat_entity, 0); | |
27becfc8 | 7912 | |
e3698827 | 7913 | /* A variable using the Stdcall convention lives in a DLL. We adjust |
7914 | its name to use the jump table, the _imp__NAME contains the address | |
7915 | for the NAME variable. */ | |
27becfc8 | 7916 | if ((kind == E_Variable || kind == E_Constant) |
7917 | && Has_Stdcall_Convention (gnat_entity)) | |
7918 | { | |
e3698827 | 7919 | const int len = 6 + Name_Len; |
7920 | char *new_name = (char *) alloca (len + 1); | |
7921 | strcpy (new_name, "_imp__"); | |
7922 | strcat (new_name, Name_Buffer); | |
7923 | return get_identifier_with_length (new_name, len); | |
27becfc8 | 7924 | } |
7925 | ||
e3698827 | 7926 | return get_identifier_with_length (Name_Buffer, Name_Len); |
27becfc8 | 7927 | } |
7928 | ||
e3698827 | 7929 | /* Given GNU_NAME, an IDENTIFIER_NODE containing a name and SUFFIX, a |
27becfc8 | 7930 | string, return a new IDENTIFIER_NODE that is the concatenation of |
e3698827 | 7931 | the name followed by "___" and the specified suffix. */ |
27becfc8 | 7932 | |
7933 | tree | |
e3698827 | 7934 | concat_name (tree gnu_name, const char *suffix) |
27becfc8 | 7935 | { |
e3698827 | 7936 | const int len = IDENTIFIER_LENGTH (gnu_name) + 3 + strlen (suffix); |
7937 | char *new_name = (char *) alloca (len + 1); | |
7938 | strcpy (new_name, IDENTIFIER_POINTER (gnu_name)); | |
7939 | strcat (new_name, "___"); | |
7940 | strcat (new_name, suffix); | |
7941 | return get_identifier_with_length (new_name, len); | |
27becfc8 | 7942 | } |
7943 | ||
7944 | #include "gt-ada-decl.h" |