1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 1992-2007, Free Software Foundation, Inc. *
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 2, 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 distributed with GNAT; see file COPYING. If not, write *
19 * to the Free Software Foundation, 51 Franklin Street, Fifth Floor, *
20 * Boston, MA 02110-1301, USA. *
22 * GNAT was originally developed by the GNAT team at New York University. *
23 * Extensive contributions were provided by Ada Core Technologies Inc. *
25 ****************************************************************************/
29 #include "coretypes.h"
43 #include "tree-gimple.h"
60 /* Let code below know whether we are targetting VMS without need of
61 intrusive preprocessor directives. */
62 #ifndef TARGET_ABI_OPEN_VMS
63 #define TARGET_ABI_OPEN_VMS 0
68 struct Node *Nodes_Ptr;
69 Node_Id *Next_Node_Ptr;
70 Node_Id *Prev_Node_Ptr;
71 struct Elist_Header *Elists_Ptr;
72 struct Elmt_Item *Elmts_Ptr;
73 struct String_Entry *Strings_Ptr;
74 Char_Code *String_Chars_Ptr;
75 struct List_Header *List_Headers_Ptr;
77 /* Current filename without path. */
78 const char *ref_filename;
80 /* If true, then gigi is being called on an analyzed but unexpanded
81 tree, and the only purpose of the call is to properly annotate
82 types with representation information. */
83 bool type_annotate_only;
85 /* When not optimizing, we cache the 'First, 'Last and 'Length attributes
86 of unconstrained array IN parameters to avoid emitting a great deal of
87 redundant instructions to recompute them each time. */
88 struct parm_attr GTY (())
90 int id; /* GTY doesn't like Entity_Id. */
97 typedef struct parm_attr *parm_attr;
100 DEF_VEC_ALLOC_P(parm_attr,gc);
102 struct language_function GTY(())
104 VEC(parm_attr,gc) *parm_attr_cache;
107 #define f_parm_attr_cache \
108 DECL_STRUCT_FUNCTION (current_function_decl)->language->parm_attr_cache
110 /* A structure used to gather together information about a statement group.
111 We use this to gather related statements, for example the "then" part
112 of a IF. In the case where it represents a lexical scope, we may also
113 have a BLOCK node corresponding to it and/or cleanups. */
115 struct stmt_group GTY((chain_next ("%h.previous"))) {
116 struct stmt_group *previous; /* Previous code group. */
117 tree stmt_list; /* List of statements for this code group. */
118 tree block; /* BLOCK for this code group, if any. */
119 tree cleanups; /* Cleanups for this code group, if any. */
122 static GTY(()) struct stmt_group *current_stmt_group;
124 /* List of unused struct stmt_group nodes. */
125 static GTY((deletable)) struct stmt_group *stmt_group_free_list;
127 /* A structure used to record information on elaboration procedures
128 we've made and need to process.
130 ??? gnat_node should be Node_Id, but gengtype gets confused. */
132 struct elab_info GTY((chain_next ("%h.next"))) {
133 struct elab_info *next; /* Pointer to next in chain. */
134 tree elab_proc; /* Elaboration procedure. */
135 int gnat_node; /* The N_Compilation_Unit. */
138 static GTY(()) struct elab_info *elab_info_list;
140 /* Free list of TREE_LIST nodes used for stacks. */
141 static GTY((deletable)) tree gnu_stack_free_list;
143 /* List of TREE_LIST nodes representing a stack of exception pointer
144 variables. TREE_VALUE is the VAR_DECL that stores the address of
145 the raised exception. Nonzero means we are in an exception
146 handler. Not used in the zero-cost case. */
147 static GTY(()) tree gnu_except_ptr_stack;
149 /* List of TREE_LIST nodes used to store the current elaboration procedure
150 decl. TREE_VALUE is the decl. */
151 static GTY(()) tree gnu_elab_proc_stack;
153 /* Variable that stores a list of labels to be used as a goto target instead of
154 a return in some functions. See processing for N_Subprogram_Body. */
155 static GTY(()) tree gnu_return_label_stack;
157 /* List of TREE_LIST nodes representing a stack of LOOP_STMT nodes.
158 TREE_VALUE of each entry is the label of the corresponding LOOP_STMT. */
159 static GTY(()) tree gnu_loop_label_stack;
161 /* List of TREE_LIST nodes representing labels for switch statements.
162 TREE_VALUE of each entry is the label at the end of the switch. */
163 static GTY(()) tree gnu_switch_label_stack;
165 /* List of TREE_LIST nodes containing the stacks for N_{Push,Pop}_*_Label. */
166 static GTY(()) tree gnu_constraint_error_label_stack;
167 static GTY(()) tree gnu_storage_error_label_stack;
168 static GTY(()) tree gnu_program_error_label_stack;
170 /* Map GNAT tree codes to GCC tree codes for simple expressions. */
171 static enum tree_code gnu_codes[Number_Node_Kinds];
173 /* Current node being treated, in case abort called. */
174 Node_Id error_gnat_node;
176 static void Compilation_Unit_to_gnu (Node_Id);
177 static void record_code_position (Node_Id);
178 static void insert_code_for (Node_Id);
179 static void add_cleanup (tree, Node_Id);
180 static tree mark_visited (tree *, int *, void *);
181 static tree unshare_save_expr (tree *, int *, void *);
182 static void add_stmt_list (List_Id);
183 static void push_exception_label_stack (tree *, Entity_Id);
184 static tree build_stmt_group (List_Id, bool);
185 static void push_stack (tree *, tree, tree);
186 static void pop_stack (tree *);
187 static enum gimplify_status gnat_gimplify_stmt (tree *);
188 static void elaborate_all_entities (Node_Id);
189 static void process_freeze_entity (Node_Id);
190 static void process_inlined_subprograms (Node_Id);
191 static void process_decls (List_Id, List_Id, Node_Id, bool, bool);
192 static tree emit_range_check (tree, Node_Id);
193 static tree emit_index_check (tree, tree, tree, tree);
194 static tree emit_check (tree, tree, int);
195 static tree convert_with_check (Entity_Id, tree, bool, bool, bool);
196 static bool addressable_p (tree);
197 static tree assoc_to_constructor (Entity_Id, Node_Id, tree);
198 static tree extract_values (tree, tree);
199 static tree pos_to_constructor (Node_Id, tree, Entity_Id);
200 static tree maybe_implicit_deref (tree);
201 static tree gnat_stabilize_reference (tree, bool);
202 static tree gnat_stabilize_reference_1 (tree, bool);
203 static void annotate_with_node (tree, Node_Id);
204 static int takes_address (Node_Id, tree);
206 /* This is the main program of the back-end. It sets up all the table
207 structures and then generates code. */
210 gigi (Node_Id gnat_root, int max_gnat_node, int number_name,
211 struct Node *nodes_ptr, Node_Id *next_node_ptr, Node_Id *prev_node_ptr,
212 struct Elist_Header *elists_ptr, struct Elmt_Item *elmts_ptr,
213 struct String_Entry *strings_ptr, Char_Code *string_chars_ptr,
214 struct List_Header *list_headers_ptr, Int number_units ATTRIBUTE_UNUSED,
215 char *file_info_ptr ATTRIBUTE_UNUSED, Entity_Id standard_integer,
216 Entity_Id standard_long_long_float, Entity_Id standard_exception_type,
217 Int gigi_operating_mode)
219 tree gnu_standard_long_long_float;
220 tree gnu_standard_exception_type;
221 struct elab_info *info;
223 max_gnat_nodes = max_gnat_node;
224 number_names = number_name;
225 Nodes_Ptr = nodes_ptr;
226 Next_Node_Ptr = next_node_ptr;
227 Prev_Node_Ptr = prev_node_ptr;
228 Elists_Ptr = elists_ptr;
229 Elmts_Ptr = elmts_ptr;
230 Strings_Ptr = strings_ptr;
231 String_Chars_Ptr = string_chars_ptr;
232 List_Headers_Ptr = list_headers_ptr;
234 type_annotate_only = (gigi_operating_mode == 1);
237 gnat_compute_largest_alignment ();
240 /* If we are just annotating types, give VOID_TYPE zero sizes to avoid
242 if (type_annotate_only)
244 TYPE_SIZE (void_type_node) = bitsize_zero_node;
245 TYPE_SIZE_UNIT (void_type_node) = size_zero_node;
248 /* Save the type we made for integer as the type for Standard.Integer.
249 Then make the rest of the standard types. Note that some of these
251 save_gnu_tree (Base_Type (standard_integer), TYPE_NAME (integer_type_node),
254 gnu_except_ptr_stack = tree_cons (NULL_TREE, NULL_TREE, NULL_TREE);
255 gnu_constraint_error_label_stack
256 = tree_cons (NULL_TREE, NULL_TREE, NULL_TREE);
257 gnu_storage_error_label_stack = tree_cons (NULL_TREE, NULL_TREE, NULL_TREE);
258 gnu_program_error_label_stack = tree_cons (NULL_TREE, NULL_TREE, NULL_TREE);
260 gnu_standard_long_long_float
261 = gnat_to_gnu_entity (Base_Type (standard_long_long_float), NULL_TREE, 0);
262 gnu_standard_exception_type
263 = gnat_to_gnu_entity (Base_Type (standard_exception_type), NULL_TREE, 0);
265 init_gigi_decls (gnu_standard_long_long_float, gnu_standard_exception_type);
267 /* Process any Pragma Ident for the main unit. */
268 #ifdef ASM_OUTPUT_IDENT
269 if (Present (Ident_String (Main_Unit)))
272 TREE_STRING_POINTER (gnat_to_gnu (Ident_String (Main_Unit))));
275 /* If we are using the GCC exception mechanism, let GCC know. */
276 if (Exception_Mechanism == Back_End_Exceptions)
279 gcc_assert (Nkind (gnat_root) == N_Compilation_Unit);
280 Compilation_Unit_to_gnu (gnat_root);
282 /* Now see if we have any elaboration procedures to deal with. */
283 for (info = elab_info_list; info; info = info->next)
285 tree gnu_body = DECL_SAVED_TREE (info->elab_proc);
288 /* Unshare SAVE_EXPRs between subprograms. These are not unshared by
289 the gimplifier for obvious reasons, but it turns out that we need to
290 unshare them for the global level because of SAVE_EXPRs made around
291 checks for global objects and around allocators for global objects
292 of variable size, in order to prevent node sharing in the underlying
293 expression. Note that this implicitly assumes that the SAVE_EXPR
294 nodes themselves are not shared between subprograms, which would be
295 an upstream bug for which we would not change the outcome. */
296 walk_tree_without_duplicates (&gnu_body, unshare_save_expr, NULL);
298 /* Set the current function to be the elaboration procedure and gimplify
300 current_function_decl = info->elab_proc;
301 gimplify_body (&gnu_body, info->elab_proc, true);
303 /* We should have a BIND_EXPR, but it may or may not have any statements
304 in it. If it doesn't have any, we have nothing to do. */
305 gnu_stmts = gnu_body;
306 if (TREE_CODE (gnu_stmts) == BIND_EXPR)
307 gnu_stmts = BIND_EXPR_BODY (gnu_stmts);
309 /* If there are no statements, there is no elaboration code. */
310 if (!gnu_stmts || !STATEMENT_LIST_HEAD (gnu_stmts))
312 Set_Has_No_Elaboration_Code (info->gnat_node, 1);
313 cgraph_remove_node (cgraph_node (info->elab_proc));
317 /* Otherwise, compile the function. Note that we'll be gimplifying
318 it twice, but that's fine for the nodes we use. */
319 begin_subprog_body (info->elab_proc);
320 end_subprog_body (gnu_body);
325 /* Perform initializations for this module. */
328 gnat_init_stmt_group (void)
330 /* Initialize ourselves. */
334 /* Enable GNAT stack checking method if needed */
335 if (!Stack_Check_Probes_On_Target)
336 set_stack_check_libfunc (gen_rtx_SYMBOL_REF (Pmode, "_gnat_stack_check"));
339 /* Returns a positive value if GNAT_NODE denotes an address construction
340 for an operand of OPERAND_TYPE, zero otherwise. This is int instead
341 of bool to facilitate usage in non purely binary logic contexts. */
344 takes_address (Node_Id gnat_node, tree operand_type)
346 switch (Nkind (gnat_node))
351 case N_Attribute_Reference:
353 unsigned char id = Get_Attribute_Id (Attribute_Name (gnat_node));
354 return id == Attr_Address
356 || id == Attr_Unchecked_Access
357 || id == Attr_Unrestricted_Access;
360 case N_Function_Call:
361 case N_Procedure_Call_Statement:
362 return must_pass_by_ref (operand_type)
363 || default_pass_by_ref (operand_type);
365 case N_Indexed_Component:
368 /* ??? Consider that referencing an indexed component with a
369 non-constant index forces the whole aggregate to memory.
370 Note that N_Integer_Literal is conservative, any static
371 expression in the RM sense could probably be accepted. */
372 for (gnat_temp = First (Expressions (gnat_node));
374 gnat_temp = Next (gnat_temp))
375 if (Nkind (gnat_temp) != N_Integer_Literal)
377 return takes_address (Parent (gnat_node), operand_type);
387 /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Identifier,
388 to a GCC tree, which is returned. GNU_RESULT_TYPE_P is a pointer to
389 where we should place the result type. */
392 Identifier_to_gnu (Node_Id gnat_node, tree *gnu_result_type_p)
394 tree gnu_result_type;
396 Node_Id gnat_temp, gnat_temp_type;
398 /* Whether the parent of gnat_node is taking its address. Needed in
399 specific circumstances only, so evaluated lazily. < 0 means unknown,
400 > 0 means known true, 0 means known false. */
401 int parent_takes_address = -1;
403 /* If GNAT_NODE is a constant, whether we should use the initialization
404 value instead of the constant entity, typically for scalars with an
405 address clause when the parent is not taking the address. */
406 bool use_constant_initializer = false;
408 /* If the Etype of this node does not equal the Etype of the Entity,
409 something is wrong with the entity map, probably in generic
410 instantiation. However, this does not apply to types. Since we sometime
411 have strange Ekind's, just do this test for objects. Also, if the Etype of
412 the Entity is private, the Etype of the N_Identifier is allowed to be the
413 full type and also we consider a packed array type to be the same as the
414 original type. Similarly, a class-wide type is equivalent to a subtype of
415 itself. Finally, if the types are Itypes, one may be a copy of the other,
416 which is also legal. */
417 gnat_temp = (Nkind (gnat_node) == N_Defining_Identifier
418 ? gnat_node : Entity (gnat_node));
419 gnat_temp_type = Etype (gnat_temp);
421 gcc_assert (Etype (gnat_node) == gnat_temp_type
422 || (Is_Packed (gnat_temp_type)
423 && Etype (gnat_node) == Packed_Array_Type (gnat_temp_type))
424 || (Is_Class_Wide_Type (Etype (gnat_node)))
425 || (IN (Ekind (gnat_temp_type), Private_Kind)
426 && Present (Full_View (gnat_temp_type))
427 && ((Etype (gnat_node) == Full_View (gnat_temp_type))
428 || (Is_Packed (Full_View (gnat_temp_type))
429 && (Etype (gnat_node)
430 == Packed_Array_Type (Full_View
431 (gnat_temp_type))))))
432 || (Is_Itype (Etype (gnat_node)) && Is_Itype (gnat_temp_type))
433 || !(Ekind (gnat_temp) == E_Variable
434 || Ekind (gnat_temp) == E_Component
435 || Ekind (gnat_temp) == E_Constant
436 || Ekind (gnat_temp) == E_Loop_Parameter
437 || IN (Ekind (gnat_temp), Formal_Kind)));
439 /* If this is a reference to a deferred constant whose partial view is an
440 unconstrained private type, the proper type is on the full view of the
441 constant, not on the full view of the type, which may be unconstrained.
443 This may be a reference to a type, for example in the prefix of the
444 attribute Position, generated for dispatching code (see Make_DT in
445 exp_disp,adb). In that case we need the type itself, not is parent,
446 in particular if it is a derived type */
447 if (Is_Private_Type (gnat_temp_type)
448 && Has_Unknown_Discriminants (gnat_temp_type)
449 && Ekind (gnat_temp) == E_Constant
450 && Present (Full_View (gnat_temp)))
452 gnat_temp = Full_View (gnat_temp);
453 gnat_temp_type = Etype (gnat_temp);
457 /* We want to use the Actual_Subtype if it has already been elaborated,
458 otherwise the Etype. Avoid using Actual_Subtype for packed arrays to
460 if ((Ekind (gnat_temp) == E_Constant
461 || Ekind (gnat_temp) == E_Variable || Is_Formal (gnat_temp))
462 && !(Is_Array_Type (Etype (gnat_temp))
463 && Present (Packed_Array_Type (Etype (gnat_temp))))
464 && Present (Actual_Subtype (gnat_temp))
465 && present_gnu_tree (Actual_Subtype (gnat_temp)))
466 gnat_temp_type = Actual_Subtype (gnat_temp);
468 gnat_temp_type = Etype (gnat_node);
471 /* Expand the type of this identifier first, in case it is an enumeral
472 literal, which only get made when the type is expanded. There is no
473 order-of-elaboration issue here. */
474 gnu_result_type = get_unpadded_type (gnat_temp_type);
476 /* If this is a non-imported scalar constant with an address clause,
477 retrieve the value instead of a pointer to be dereferenced, unless the
478 parent is taking the address. This is generally more efficient and
479 actually required if this is a static expression because it might be used
480 in a context where a dereference is inappropriate, such as a case
481 statement alternative or a record discriminant. There is no possible
482 volatile-ness shortciruit here since Volatile constants must be imported
484 if (Ekind (gnat_temp) == E_Constant && Is_Scalar_Type (gnat_temp_type)
485 && !Is_Imported (gnat_temp)
486 && Present (Address_Clause (gnat_temp)))
489 = takes_address (Parent (gnat_node), gnu_result_type);
490 use_constant_initializer = !parent_takes_address;
493 if (use_constant_initializer)
495 /* If this is a deferred constant, the initializer is attached to the
497 if (Present (Full_View (gnat_temp)))
498 gnat_temp = Full_View (gnat_temp);
500 gnu_result = gnat_to_gnu (Expression (Declaration_Node (gnat_temp)));
503 gnu_result = gnat_to_gnu_entity (gnat_temp, NULL_TREE, 0);
505 /* If we are in an exception handler, force this variable into memory to
506 ensure optimization does not remove stores that appear redundant but are
507 actually needed in case an exception occurs.
509 ??? Note that we need not do this if the variable is declared within the
510 handler, only if it is referenced in the handler and declared in an
511 enclosing block, but we have no way of testing that right now.
513 ??? We used to essentially set the TREE_ADDRESSABLE flag on the variable
514 here, but it can now be removed by the Tree aliasing machinery if the
515 address of the variable is never taken. All we can do is to make the
516 variable volatile, which might incur the generation of temporaries just
517 to access the memory in some circumstances. This can be avoided for
518 variables of non-constant size because they are automatically allocated
519 to memory. There might be no way of allocating a proper temporary for
520 them in any case. We only do this for SJLJ though. */
521 if (TREE_VALUE (gnu_except_ptr_stack)
522 && TREE_CODE (gnu_result) == VAR_DECL
523 && TREE_CODE (DECL_SIZE_UNIT (gnu_result)) == INTEGER_CST)
524 TREE_THIS_VOLATILE (gnu_result) = TREE_SIDE_EFFECTS (gnu_result) = 1;
526 /* Some objects (such as parameters passed by reference, globals of
527 variable size, and renamed objects) actually represent the address
528 of the object. In that case, we must do the dereference. Likewise,
529 deal with parameters to foreign convention subprograms. */
530 if (DECL_P (gnu_result)
531 && (DECL_BY_REF_P (gnu_result)
532 || (TREE_CODE (gnu_result) == PARM_DECL
533 && DECL_BY_COMPONENT_PTR_P (gnu_result))))
535 bool ro = DECL_POINTS_TO_READONLY_P (gnu_result);
538 if (TREE_CODE (gnu_result) == PARM_DECL
539 && DECL_BY_COMPONENT_PTR_P (gnu_result))
541 = build_unary_op (INDIRECT_REF, NULL_TREE,
542 convert (build_pointer_type (gnu_result_type),
545 /* If it's a renaming pointer and we are at the right binding level,
546 we can reference the renamed object directly, since the renamed
547 expression has been protected against multiple evaluations. */
548 else if (TREE_CODE (gnu_result) == VAR_DECL
549 && (renamed_obj = DECL_RENAMED_OBJECT (gnu_result)) != 0
550 && (! DECL_RENAMING_GLOBAL_P (gnu_result)
551 || global_bindings_p ()))
552 gnu_result = renamed_obj;
554 /* Return the underlying CST for a CONST_DECL like a few lines below,
555 after dereferencing in this case. */
556 else if (TREE_CODE (gnu_result) == CONST_DECL)
557 gnu_result = build_unary_op (INDIRECT_REF, NULL_TREE,
558 DECL_INITIAL (gnu_result));
561 gnu_result = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_result);
563 TREE_READONLY (gnu_result) = TREE_STATIC (gnu_result) = ro;
566 /* The GNAT tree has the type of a function as the type of its result. Also
567 use the type of the result if the Etype is a subtype which is nominally
568 unconstrained. But remove any padding from the resulting type. */
569 if (TREE_CODE (TREE_TYPE (gnu_result)) == FUNCTION_TYPE
570 || Is_Constr_Subt_For_UN_Aliased (gnat_temp_type))
572 gnu_result_type = TREE_TYPE (gnu_result);
573 if (TREE_CODE (gnu_result_type) == RECORD_TYPE
574 && TYPE_IS_PADDING_P (gnu_result_type))
575 gnu_result_type = TREE_TYPE (TYPE_FIELDS (gnu_result_type));
578 /* If we have a constant declaration and it's initializer at hand, return
579 the latter to avoid the need to call fold in lots of places and the need
580 of elaboration code if this Id is used as an initializer itself. Don't
581 do this if the parent will be taking the address of this object and
582 there is a corresponding variable to take the address of. */
583 if (TREE_CONSTANT (gnu_result)
584 && DECL_P (gnu_result) && DECL_INITIAL (gnu_result))
587 = (TREE_CODE (gnu_result) == CONST_DECL
588 ? DECL_CONST_CORRESPONDING_VAR (gnu_result) : gnu_result);
590 /* If there is a corresponding variable, we only want to return the CST
591 value if the parent is not taking the address. Evaluate this now if
592 we have not already done so. */
593 if (object && parent_takes_address < 0)
595 = takes_address (Parent (gnat_node), gnu_result_type);
597 if (!object || !parent_takes_address)
598 gnu_result = DECL_INITIAL (gnu_result);
601 *gnu_result_type_p = gnu_result_type;
605 /* Subroutine of gnat_to_gnu to process gnat_node, an N_Pragma. Return
606 any statements we generate. */
609 Pragma_to_gnu (Node_Id gnat_node)
612 tree gnu_result = alloc_stmt_list ();
614 /* Check for (and ignore) unrecognized pragma and do nothing if we are just
616 if (type_annotate_only || !Is_Pragma_Name (Chars (gnat_node)))
619 switch (Get_Pragma_Id (Chars (gnat_node)))
621 case Pragma_Inspection_Point:
622 /* Do nothing at top level: all such variables are already viewable. */
623 if (global_bindings_p ())
626 for (gnat_temp = First (Pragma_Argument_Associations (gnat_node));
628 gnat_temp = Next (gnat_temp))
630 Node_Id gnat_expr = Expression (gnat_temp);
631 tree gnu_expr = gnat_to_gnu (gnat_expr);
633 enum machine_mode mode;
634 tree asm_constraint = NULL_TREE;
635 #ifdef ASM_COMMENT_START
639 if (TREE_CODE (gnu_expr) == UNCONSTRAINED_ARRAY_REF)
640 gnu_expr = TREE_OPERAND (gnu_expr, 0);
642 /* Use the value only if it fits into a normal register,
643 otherwise use the address. */
644 mode = TYPE_MODE (TREE_TYPE (gnu_expr));
645 use_address = ((GET_MODE_CLASS (mode) != MODE_INT
646 && GET_MODE_CLASS (mode) != MODE_PARTIAL_INT)
647 || GET_MODE_SIZE (mode) > UNITS_PER_WORD);
650 gnu_expr = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_expr);
652 #ifdef ASM_COMMENT_START
653 comment = concat (ASM_COMMENT_START,
654 " inspection point: ",
655 Get_Name_String (Chars (gnat_expr)),
656 use_address ? " address" : "",
659 asm_constraint = build_string (strlen (comment), comment);
662 gnu_expr = build4 (ASM_EXPR, void_type_node,
666 (build_tree_list (NULL_TREE,
667 build_string (1, "g")),
668 gnu_expr, NULL_TREE),
670 ASM_VOLATILE_P (gnu_expr) = 1;
671 annotate_with_node (gnu_expr, gnat_node);
672 append_to_statement_list (gnu_expr, &gnu_result);
676 case Pragma_Optimize:
677 switch (Chars (Expression
678 (First (Pragma_Argument_Associations (gnat_node)))))
680 case Name_Time: case Name_Space:
682 post_error ("insufficient -O value?", gnat_node);
687 post_error ("must specify -O0?", gnat_node);
695 case Pragma_Reviewable:
696 if (write_symbols == NO_DEBUG)
697 post_error ("must specify -g?", gnat_node);
703 /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Attribute,
704 to a GCC tree, which is returned. GNU_RESULT_TYPE_P is a pointer to
705 where we should place the result type. ATTRIBUTE is the attribute ID. */
708 Attribute_to_gnu (Node_Id gnat_node, tree *gnu_result_type_p, int attribute)
710 tree gnu_result = error_mark_node;
711 tree gnu_result_type;
713 bool prefix_unused = false;
714 tree gnu_prefix = gnat_to_gnu (Prefix (gnat_node));
715 tree gnu_type = TREE_TYPE (gnu_prefix);
717 /* If the input is a NULL_EXPR, make a new one. */
718 if (TREE_CODE (gnu_prefix) == NULL_EXPR)
720 *gnu_result_type_p = get_unpadded_type (Etype (gnat_node));
721 return build1 (NULL_EXPR, *gnu_result_type_p,
722 TREE_OPERAND (gnu_prefix, 0));
729 /* These are just conversions until since representation clauses for
730 enumerations are handled in the front end. */
732 bool checkp = Do_Range_Check (First (Expressions (gnat_node)));
734 gnu_result = gnat_to_gnu (First (Expressions (gnat_node)));
735 gnu_result_type = get_unpadded_type (Etype (gnat_node));
736 gnu_result = convert_with_check (Etype (gnat_node), gnu_result,
737 checkp, checkp, true);
743 /* These just add or subject the constant 1. Representation clauses for
744 enumerations are handled in the front-end. */
745 gnu_expr = gnat_to_gnu (First (Expressions (gnat_node)));
746 gnu_result_type = get_unpadded_type (Etype (gnat_node));
748 if (Do_Range_Check (First (Expressions (gnat_node))))
750 gnu_expr = protect_multiple_eval (gnu_expr);
753 (build_binary_op (EQ_EXPR, integer_type_node,
755 attribute == Attr_Pred
756 ? TYPE_MIN_VALUE (gnu_result_type)
757 : TYPE_MAX_VALUE (gnu_result_type)),
758 gnu_expr, CE_Range_Check_Failed);
762 = build_binary_op (attribute == Attr_Pred
763 ? MINUS_EXPR : PLUS_EXPR,
764 gnu_result_type, gnu_expr,
765 convert (gnu_result_type, integer_one_node));
769 case Attr_Unrestricted_Access:
770 /* Conversions don't change something's address but can cause us to miss
771 the COMPONENT_REF case below, so strip them off. */
772 gnu_prefix = remove_conversions (gnu_prefix,
773 !Must_Be_Byte_Aligned (gnat_node));
775 /* If we are taking 'Address of an unconstrained object, this is the
776 pointer to the underlying array. */
777 if (attribute == Attr_Address)
778 gnu_prefix = maybe_unconstrained_array (gnu_prefix);
780 /* ... fall through ... */
783 case Attr_Unchecked_Access:
784 case Attr_Code_Address:
785 gnu_result_type = get_unpadded_type (Etype (gnat_node));
787 = build_unary_op (((attribute == Attr_Address
788 || attribute == Attr_Unrestricted_Access)
789 && !Must_Be_Byte_Aligned (gnat_node))
790 ? ATTR_ADDR_EXPR : ADDR_EXPR,
791 gnu_result_type, gnu_prefix);
793 /* For 'Code_Address, find an inner ADDR_EXPR and mark it so that we
794 don't try to build a trampoline. */
795 if (attribute == Attr_Code_Address)
797 for (gnu_expr = gnu_result;
798 TREE_CODE (gnu_expr) == NOP_EXPR
799 || TREE_CODE (gnu_expr) == CONVERT_EXPR;
800 gnu_expr = TREE_OPERAND (gnu_expr, 0))
801 TREE_CONSTANT (gnu_expr) = 1;
803 if (TREE_CODE (gnu_expr) == ADDR_EXPR)
804 TREE_STATIC (gnu_expr) = TREE_CONSTANT (gnu_expr) = 1;
808 case Attr_Pool_Address:
811 tree gnu_ptr = gnu_prefix;
813 gnu_result_type = get_unpadded_type (Etype (gnat_node));
815 /* If this is an unconstrained array, we know the object must have been
816 allocated with the template in front of the object. So compute the
818 if (TYPE_FAT_POINTER_P (TREE_TYPE (gnu_ptr)))
820 = convert (build_pointer_type
821 (TYPE_OBJECT_RECORD_TYPE
822 (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (gnu_ptr)))),
825 gnu_obj_type = TREE_TYPE (TREE_TYPE (gnu_ptr));
826 if (TREE_CODE (gnu_obj_type) == RECORD_TYPE
827 && TYPE_CONTAINS_TEMPLATE_P (gnu_obj_type))
829 tree gnu_char_ptr_type = build_pointer_type (char_type_node);
830 tree gnu_pos = byte_position (TYPE_FIELDS (gnu_obj_type));
832 = convert (gnu_char_ptr_type,
833 size_diffop (size_zero_node, gnu_pos));
835 gnu_ptr = convert (gnu_char_ptr_type, gnu_ptr);
836 gnu_ptr = build_binary_op (MINUS_EXPR, gnu_char_ptr_type,
837 gnu_ptr, gnu_byte_offset);
840 gnu_result = convert (gnu_result_type, gnu_ptr);
845 case Attr_Object_Size:
846 case Attr_Value_Size:
847 case Attr_Max_Size_In_Storage_Elements:
848 gnu_expr = gnu_prefix;
850 /* Remove NOPS from gnu_expr and conversions from gnu_prefix.
851 We only use GNU_EXPR to see if a COMPONENT_REF was involved. */
852 while (TREE_CODE (gnu_expr) == NOP_EXPR)
853 gnu_expr = TREE_OPERAND (gnu_expr, 0)
856 gnu_prefix = remove_conversions (gnu_prefix, true);
857 prefix_unused = true;
858 gnu_type = TREE_TYPE (gnu_prefix);
860 /* Replace an unconstrained array type with the type of the underlying
861 array. We can't do this with a call to maybe_unconstrained_array
862 since we may have a TYPE_DECL. For 'Max_Size_In_Storage_Elements,
863 use the record type that will be used to allocate the object and its
865 if (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
867 gnu_type = TYPE_OBJECT_RECORD_TYPE (gnu_type);
868 if (attribute != Attr_Max_Size_In_Storage_Elements)
869 gnu_type = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)));
872 /* If we're looking for the size of a field, return the field size.
873 Otherwise, if the prefix is an object, or if 'Object_Size or
874 'Max_Size_In_Storage_Elements has been specified, the result is the
875 GCC size of the type. Otherwise, the result is the RM_Size of the
877 if (TREE_CODE (gnu_prefix) == COMPONENT_REF)
878 gnu_result = DECL_SIZE (TREE_OPERAND (gnu_prefix, 1));
879 else if (TREE_CODE (gnu_prefix) != TYPE_DECL
880 || attribute == Attr_Object_Size
881 || attribute == Attr_Max_Size_In_Storage_Elements)
883 /* If this is a padded type, the GCC size isn't relevant to the
884 programmer. Normally, what we want is the RM_Size, which was set
885 from the specified size, but if it was not set, we want the size
886 of the relevant field. Using the MAX of those two produces the
887 right result in all case. Don't use the size of the field if it's
888 a self-referential type, since that's never what's wanted. */
889 if (TREE_CODE (gnu_type) == RECORD_TYPE
890 && TYPE_IS_PADDING_P (gnu_type)
891 && TREE_CODE (gnu_expr) == COMPONENT_REF)
893 gnu_result = rm_size (gnu_type);
894 if (!(CONTAINS_PLACEHOLDER_P
895 (DECL_SIZE (TREE_OPERAND (gnu_expr, 1)))))
897 = size_binop (MAX_EXPR, gnu_result,
898 DECL_SIZE (TREE_OPERAND (gnu_expr, 1)));
900 else if (Nkind (Prefix (gnat_node)) == N_Explicit_Dereference)
902 Node_Id gnat_deref = Prefix (gnat_node);
903 Node_Id gnat_actual_subtype = Actual_Designated_Subtype (gnat_deref);
904 tree gnu_ptr_type = TREE_TYPE (gnat_to_gnu (Prefix (gnat_deref)));
905 if (TYPE_FAT_OR_THIN_POINTER_P (gnu_ptr_type)
906 && Present (gnat_actual_subtype))
908 tree gnu_actual_obj_type = gnat_to_gnu_type (gnat_actual_subtype);
909 gnu_type = build_unc_object_type_from_ptr (gnu_ptr_type,
910 gnu_actual_obj_type, get_identifier ("SIZE"));
913 gnu_result = TYPE_SIZE (gnu_type);
916 gnu_result = TYPE_SIZE (gnu_type);
919 gnu_result = rm_size (gnu_type);
921 gcc_assert (gnu_result);
923 /* Deal with a self-referential size by returning the maximum size for a
924 type and by qualifying the size with the object for 'Size of an
926 if (CONTAINS_PLACEHOLDER_P (gnu_result))
928 if (TREE_CODE (gnu_prefix) != TYPE_DECL)
929 gnu_result = substitute_placeholder_in_expr (gnu_result, gnu_expr);
931 gnu_result = max_size (gnu_result, true);
934 /* If the type contains a template, subtract its size. */
935 if (TREE_CODE (gnu_type) == RECORD_TYPE
936 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
937 gnu_result = size_binop (MINUS_EXPR, gnu_result,
938 DECL_SIZE (TYPE_FIELDS (gnu_type)));
940 gnu_result_type = get_unpadded_type (Etype (gnat_node));
942 /* Always perform division using unsigned arithmetic as the size cannot
943 be negative, but may be an overflowed positive value. This provides
944 correct results for sizes up to 512 MB.
946 ??? Size should be calculated in storage elements directly. */
948 if (attribute == Attr_Max_Size_In_Storage_Elements)
949 gnu_result = convert (sizetype,
950 fold_build2 (CEIL_DIV_EXPR, bitsizetype,
951 gnu_result, bitsize_unit_node));
955 if (TREE_CODE (gnu_prefix) == COMPONENT_REF
956 && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0)))
958 && (TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0)))))
959 gnu_prefix = TREE_OPERAND (gnu_prefix, 0);
961 gnu_type = TREE_TYPE (gnu_prefix);
962 gnu_result_type = get_unpadded_type (Etype (gnat_node));
963 prefix_unused = true;
965 gnu_result = size_int ((TREE_CODE (gnu_prefix) == COMPONENT_REF
966 ? DECL_ALIGN (TREE_OPERAND (gnu_prefix, 1))
967 : TYPE_ALIGN (gnu_type)) / BITS_PER_UNIT);
972 case Attr_Range_Length:
973 prefix_unused = true;
975 if (INTEGRAL_TYPE_P (gnu_type) || TREE_CODE (gnu_type) == REAL_TYPE)
977 gnu_result_type = get_unpadded_type (Etype (gnat_node));
979 if (attribute == Attr_First)
980 gnu_result = TYPE_MIN_VALUE (gnu_type);
981 else if (attribute == Attr_Last)
982 gnu_result = TYPE_MAX_VALUE (gnu_type);
986 (MAX_EXPR, get_base_type (gnu_result_type),
988 (PLUS_EXPR, get_base_type (gnu_result_type),
989 build_binary_op (MINUS_EXPR,
990 get_base_type (gnu_result_type),
991 convert (gnu_result_type,
992 TYPE_MAX_VALUE (gnu_type)),
993 convert (gnu_result_type,
994 TYPE_MIN_VALUE (gnu_type))),
995 convert (gnu_result_type, integer_one_node)),
996 convert (gnu_result_type, integer_zero_node));
1001 /* ... fall through ... */
1005 int Dimension = (Present (Expressions (gnat_node))
1006 ? UI_To_Int (Intval (First (Expressions (gnat_node))))
1008 struct parm_attr *pa = NULL;
1009 Entity_Id gnat_param = Empty;
1011 /* Make sure any implicit dereference gets done. */
1012 gnu_prefix = maybe_implicit_deref (gnu_prefix);
1013 gnu_prefix = maybe_unconstrained_array (gnu_prefix);
1014 /* We treat unconstrained array IN parameters specially. */
1015 if (Nkind (Prefix (gnat_node)) == N_Identifier
1016 && !Is_Constrained (Etype (Prefix (gnat_node)))
1017 && Ekind (Entity (Prefix (gnat_node))) == E_In_Parameter)
1018 gnat_param = Entity (Prefix (gnat_node));
1019 gnu_type = TREE_TYPE (gnu_prefix);
1020 prefix_unused = true;
1021 gnu_result_type = get_unpadded_type (Etype (gnat_node));
1023 if (TYPE_CONVENTION_FORTRAN_P (gnu_type))
1028 for (ndim = 1, gnu_type_temp = gnu_type;
1029 TREE_CODE (TREE_TYPE (gnu_type_temp)) == ARRAY_TYPE
1030 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type_temp));
1031 ndim++, gnu_type_temp = TREE_TYPE (gnu_type_temp))
1034 Dimension = ndim + 1 - Dimension;
1037 for (i = 1; i < Dimension; i++)
1038 gnu_type = TREE_TYPE (gnu_type);
1040 gcc_assert (TREE_CODE (gnu_type) == ARRAY_TYPE);
1042 /* When not optimizing, look up the slot associated with the parameter
1043 and the dimension in the cache and create a new one on failure. */
1044 if (!optimize && Present (gnat_param))
1046 for (i = 0; VEC_iterate (parm_attr, f_parm_attr_cache, i, pa); i++)
1047 if (pa->id == gnat_param && pa->dim == Dimension)
1052 pa = GGC_CNEW (struct parm_attr);
1053 pa->id = gnat_param;
1054 pa->dim = Dimension;
1055 VEC_safe_push (parm_attr, gc, f_parm_attr_cache, pa);
1059 /* Return the cached expression or build a new one. */
1060 if (attribute == Attr_First)
1062 if (pa && pa->first)
1064 gnu_result = pa->first;
1069 = TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type)));
1072 else if (attribute == Attr_Last)
1076 gnu_result = pa->last;
1081 = TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type)));
1084 else /* attribute == Attr_Range_Length || attribute == Attr_Length */
1086 tree gnu_compute_type;
1088 if (pa && pa->length)
1090 gnu_result = pa->length;
1095 = get_signed_or_unsigned_type (0,
1096 get_base_type (gnu_result_type));
1100 (MAX_EXPR, gnu_compute_type,
1102 (PLUS_EXPR, gnu_compute_type,
1104 (MINUS_EXPR, gnu_compute_type,
1105 convert (gnu_compute_type,
1107 (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type)))),
1108 convert (gnu_compute_type,
1110 (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))))),
1111 convert (gnu_compute_type, integer_one_node)),
1112 convert (gnu_compute_type, integer_zero_node));
1115 /* If this has a PLACEHOLDER_EXPR, qualify it by the object we are
1116 handling. Note that these attributes could not have been used on
1117 an unconstrained array type. */
1118 gnu_result = SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_result,
1121 /* Cache the expression we have just computed. Since we want to do it
1122 at runtime, we force the use of a SAVE_EXPR and let the gimplifier
1123 create the temporary. */
1127 = build1 (SAVE_EXPR, TREE_TYPE (gnu_result), gnu_result);
1128 TREE_SIDE_EFFECTS (gnu_result) = 1;
1129 TREE_INVARIANT (gnu_result) = 1;
1130 if (attribute == Attr_First)
1131 pa->first = gnu_result;
1132 else if (attribute == Attr_Last)
1133 pa->last = gnu_result;
1135 pa->length = gnu_result;
1140 case Attr_Bit_Position:
1142 case Attr_First_Bit:
1146 HOST_WIDE_INT bitsize;
1147 HOST_WIDE_INT bitpos;
1149 tree gnu_field_bitpos;
1150 tree gnu_field_offset;
1152 enum machine_mode mode;
1153 int unsignedp, volatilep;
1155 gnu_result_type = get_unpadded_type (Etype (gnat_node));
1156 gnu_prefix = remove_conversions (gnu_prefix, true);
1157 prefix_unused = true;
1159 /* We can have 'Bit on any object, but if it isn't a COMPONENT_REF,
1160 the result is 0. Don't allow 'Bit on a bare component, though. */
1161 if (attribute == Attr_Bit
1162 && TREE_CODE (gnu_prefix) != COMPONENT_REF
1163 && TREE_CODE (gnu_prefix) != FIELD_DECL)
1165 gnu_result = integer_zero_node;
1170 gcc_assert (TREE_CODE (gnu_prefix) == COMPONENT_REF
1171 || (attribute == Attr_Bit_Position
1172 && TREE_CODE (gnu_prefix) == FIELD_DECL));
1174 get_inner_reference (gnu_prefix, &bitsize, &bitpos, &gnu_offset,
1175 &mode, &unsignedp, &volatilep, false);
1177 if (TREE_CODE (gnu_prefix) == COMPONENT_REF)
1179 gnu_field_bitpos = bit_position (TREE_OPERAND (gnu_prefix, 1));
1180 gnu_field_offset = byte_position (TREE_OPERAND (gnu_prefix, 1));
1182 for (gnu_inner = TREE_OPERAND (gnu_prefix, 0);
1183 TREE_CODE (gnu_inner) == COMPONENT_REF
1184 && DECL_INTERNAL_P (TREE_OPERAND (gnu_inner, 1));
1185 gnu_inner = TREE_OPERAND (gnu_inner, 0))
1188 = size_binop (PLUS_EXPR, gnu_field_bitpos,
1189 bit_position (TREE_OPERAND (gnu_inner, 1)));
1191 = size_binop (PLUS_EXPR, gnu_field_offset,
1192 byte_position (TREE_OPERAND (gnu_inner, 1)));
1195 else if (TREE_CODE (gnu_prefix) == FIELD_DECL)
1197 gnu_field_bitpos = bit_position (gnu_prefix);
1198 gnu_field_offset = byte_position (gnu_prefix);
1202 gnu_field_bitpos = bitsize_zero_node;
1203 gnu_field_offset = size_zero_node;
1209 gnu_result = gnu_field_offset;
1212 case Attr_First_Bit:
1214 gnu_result = size_int (bitpos % BITS_PER_UNIT);
1218 gnu_result = bitsize_int (bitpos % BITS_PER_UNIT);
1219 gnu_result = size_binop (PLUS_EXPR, gnu_result,
1220 TYPE_SIZE (TREE_TYPE (gnu_prefix)));
1221 gnu_result = size_binop (MINUS_EXPR, gnu_result,
1225 case Attr_Bit_Position:
1226 gnu_result = gnu_field_bitpos;
1230 /* If this has a PLACEHOLDER_EXPR, qualify it by the object
1232 gnu_result = SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_result, gnu_prefix);
1239 tree gnu_lhs = gnat_to_gnu (First (Expressions (gnat_node)));
1240 tree gnu_rhs = gnat_to_gnu (Next (First (Expressions (gnat_node))));
1242 gnu_result_type = get_unpadded_type (Etype (gnat_node));
1243 gnu_result = build_binary_op (attribute == Attr_Min
1244 ? MIN_EXPR : MAX_EXPR,
1245 gnu_result_type, gnu_lhs, gnu_rhs);
1249 case Attr_Passed_By_Reference:
1250 gnu_result = size_int (default_pass_by_ref (gnu_type)
1251 || must_pass_by_ref (gnu_type));
1252 gnu_result_type = get_unpadded_type (Etype (gnat_node));
1255 case Attr_Component_Size:
1256 if (TREE_CODE (gnu_prefix) == COMPONENT_REF
1257 && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0)))
1259 && (TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0)))))
1260 gnu_prefix = TREE_OPERAND (gnu_prefix, 0);
1262 gnu_prefix = maybe_implicit_deref (gnu_prefix);
1263 gnu_type = TREE_TYPE (gnu_prefix);
1265 if (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
1266 gnu_type = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_type))));
1268 while (TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE
1269 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type)))
1270 gnu_type = TREE_TYPE (gnu_type);
1272 gcc_assert (TREE_CODE (gnu_type) == ARRAY_TYPE);
1274 /* Note this size cannot be self-referential. */
1275 gnu_result = TYPE_SIZE (TREE_TYPE (gnu_type));
1276 gnu_result_type = get_unpadded_type (Etype (gnat_node));
1277 prefix_unused = true;
1280 case Attr_Null_Parameter:
1281 /* This is just a zero cast to the pointer type for
1282 our prefix and dereferenced. */
1283 gnu_result_type = get_unpadded_type (Etype (gnat_node));
1285 = build_unary_op (INDIRECT_REF, NULL_TREE,
1286 convert (build_pointer_type (gnu_result_type),
1287 integer_zero_node));
1288 TREE_PRIVATE (gnu_result) = 1;
1291 case Attr_Mechanism_Code:
1294 Entity_Id gnat_obj = Entity (Prefix (gnat_node));
1296 prefix_unused = true;
1297 gnu_result_type = get_unpadded_type (Etype (gnat_node));
1298 if (Present (Expressions (gnat_node)))
1300 int i = UI_To_Int (Intval (First (Expressions (gnat_node))));
1302 for (gnat_obj = First_Formal (gnat_obj); i > 1;
1303 i--, gnat_obj = Next_Formal (gnat_obj))
1307 code = Mechanism (gnat_obj);
1308 if (code == Default)
1309 code = ((present_gnu_tree (gnat_obj)
1310 && (DECL_BY_REF_P (get_gnu_tree (gnat_obj))
1311 || ((TREE_CODE (get_gnu_tree (gnat_obj))
1313 && (DECL_BY_COMPONENT_PTR_P
1314 (get_gnu_tree (gnat_obj))))))
1315 ? By_Reference : By_Copy);
1316 gnu_result = convert (gnu_result_type, size_int (- code));
1321 /* Say we have an unimplemented attribute. Then set the value to be
1322 returned to be a zero and hope that's something we can convert to the
1323 type of this attribute. */
1324 post_error ("unimplemented attribute", gnat_node);
1325 gnu_result_type = get_unpadded_type (Etype (gnat_node));
1326 gnu_result = integer_zero_node;
1330 /* If this is an attribute where the prefix was unused, force a use of it if
1331 it has a side-effect. But don't do it if the prefix is just an entity
1332 name. However, if an access check is needed, we must do it. See second
1333 example in AARM 11.6(5.e). */
1334 if (prefix_unused && TREE_SIDE_EFFECTS (gnu_prefix)
1335 && !Is_Entity_Name (Prefix (gnat_node)))
1336 gnu_result = fold_build2 (COMPOUND_EXPR, TREE_TYPE (gnu_result),
1337 gnu_prefix, gnu_result);
1339 *gnu_result_type_p = gnu_result_type;
1343 /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Case_Statement,
1344 to a GCC tree, which is returned. */
1347 Case_Statement_to_gnu (Node_Id gnat_node)
1353 gnu_expr = gnat_to_gnu (Expression (gnat_node));
1354 gnu_expr = convert (get_base_type (TREE_TYPE (gnu_expr)), gnu_expr);
1356 /* The range of values in a case statement is determined by the rules in
1357 RM 5.4(7-9). In almost all cases, this range is represented by the Etype
1358 of the expression. One exception arises in the case of a simple name that
1359 is parenthesized. This still has the Etype of the name, but since it is
1360 not a name, para 7 does not apply, and we need to go to the base type.
1361 This is the only case where parenthesization affects the dynamic
1362 semantics (i.e. the range of possible values at runtime that is covered
1363 by the others alternative.
1365 Another exception is if the subtype of the expression is non-static. In
1366 that case, we also have to use the base type. */
1367 if (Paren_Count (Expression (gnat_node)) != 0
1368 || !Is_OK_Static_Subtype (Underlying_Type
1369 (Etype (Expression (gnat_node)))))
1370 gnu_expr = convert (get_base_type (TREE_TYPE (gnu_expr)), gnu_expr);
1372 /* We build a SWITCH_EXPR that contains the code with interspersed
1373 CASE_LABEL_EXPRs for each label. */
1375 push_stack (&gnu_switch_label_stack, NULL_TREE, create_artificial_label ());
1376 start_stmt_group ();
1377 for (gnat_when = First_Non_Pragma (Alternatives (gnat_node));
1378 Present (gnat_when);
1379 gnat_when = Next_Non_Pragma (gnat_when))
1381 Node_Id gnat_choice;
1382 int choices_added = 0;
1384 /* First compile all the different case choices for the current WHEN
1386 for (gnat_choice = First (Discrete_Choices (gnat_when));
1387 Present (gnat_choice); gnat_choice = Next (gnat_choice))
1389 tree gnu_low = NULL_TREE, gnu_high = NULL_TREE;
1391 switch (Nkind (gnat_choice))
1394 gnu_low = gnat_to_gnu (Low_Bound (gnat_choice));
1395 gnu_high = gnat_to_gnu (High_Bound (gnat_choice));
1398 case N_Subtype_Indication:
1399 gnu_low = gnat_to_gnu (Low_Bound (Range_Expression
1400 (Constraint (gnat_choice))));
1401 gnu_high = gnat_to_gnu (High_Bound (Range_Expression
1402 (Constraint (gnat_choice))));
1406 case N_Expanded_Name:
1407 /* This represents either a subtype range or a static value of
1408 some kind; Ekind says which. */
1409 if (IN (Ekind (Entity (gnat_choice)), Type_Kind))
1411 tree gnu_type = get_unpadded_type (Entity (gnat_choice));
1413 gnu_low = fold (TYPE_MIN_VALUE (gnu_type));
1414 gnu_high = fold (TYPE_MAX_VALUE (gnu_type));
1418 /* ... fall through ... */
1420 case N_Character_Literal:
1421 case N_Integer_Literal:
1422 gnu_low = gnat_to_gnu (gnat_choice);
1425 case N_Others_Choice:
1432 /* If the case value is a subtype that raises Constraint_Error at
1433 run-time because of a wrong bound, then gnu_low or gnu_high
1434 is not translated into an INTEGER_CST. In such a case, we need
1435 to ensure that the when statement is not added in the tree,
1436 otherwise it will crash the gimplifier. */
1437 if ((!gnu_low || TREE_CODE (gnu_low) == INTEGER_CST)
1438 && (!gnu_high || TREE_CODE (gnu_high) == INTEGER_CST))
1441 add_stmt_with_node (build3 (CASE_LABEL_EXPR, void_type_node,
1443 create_artificial_label ()),
1449 /* Push a binding level here in case variables are declared since we want
1450 them to be local to this set of statements instead of the block
1451 containing the Case statement. */
1453 if (choices_added > 0)
1455 add_stmt (build_stmt_group (Statements (gnat_when), true));
1456 add_stmt (build1 (GOTO_EXPR, void_type_node,
1457 TREE_VALUE (gnu_switch_label_stack)));
1461 /* Now emit a definition of the label all the cases branched to. */
1462 add_stmt (build1 (LABEL_EXPR, void_type_node,
1463 TREE_VALUE (gnu_switch_label_stack)));
1464 gnu_result = build3 (SWITCH_EXPR, TREE_TYPE (gnu_expr), gnu_expr,
1465 end_stmt_group (), NULL_TREE);
1466 pop_stack (&gnu_switch_label_stack);
1471 /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Loop_Statement,
1472 to a GCC tree, which is returned. */
1475 Loop_Statement_to_gnu (Node_Id gnat_node)
1477 /* ??? It would be nice to use "build" here, but there's no build5. */
1478 tree gnu_loop_stmt = build_nt (LOOP_STMT, NULL_TREE, NULL_TREE,
1479 NULL_TREE, NULL_TREE, NULL_TREE);
1480 tree gnu_loop_var = NULL_TREE;
1481 Node_Id gnat_iter_scheme = Iteration_Scheme (gnat_node);
1482 tree gnu_cond_expr = NULL_TREE;
1485 TREE_TYPE (gnu_loop_stmt) = void_type_node;
1486 TREE_SIDE_EFFECTS (gnu_loop_stmt) = 1;
1487 LOOP_STMT_LABEL (gnu_loop_stmt) = create_artificial_label ();
1488 annotate_with_node (gnu_loop_stmt, gnat_node);
1490 /* Save the end label of this LOOP_STMT in a stack so that the corresponding
1491 N_Exit_Statement can find it. */
1492 push_stack (&gnu_loop_label_stack, NULL_TREE,
1493 LOOP_STMT_LABEL (gnu_loop_stmt));
1495 /* Set the condition that under which the loop should continue.
1496 For "LOOP .... END LOOP;" the condition is always true. */
1497 if (No (gnat_iter_scheme))
1499 /* The case "WHILE condition LOOP ..... END LOOP;" */
1500 else if (Present (Condition (gnat_iter_scheme)))
1501 LOOP_STMT_TOP_COND (gnu_loop_stmt)
1502 = gnat_to_gnu (Condition (gnat_iter_scheme));
1505 /* We have an iteration scheme. */
1506 Node_Id gnat_loop_spec = Loop_Parameter_Specification (gnat_iter_scheme);
1507 Entity_Id gnat_loop_var = Defining_Entity (gnat_loop_spec);
1508 Entity_Id gnat_type = Etype (gnat_loop_var);
1509 tree gnu_type = get_unpadded_type (gnat_type);
1510 tree gnu_low = TYPE_MIN_VALUE (gnu_type);
1511 tree gnu_high = TYPE_MAX_VALUE (gnu_type);
1512 bool reversep = Reverse_Present (gnat_loop_spec);
1513 tree gnu_first = reversep ? gnu_high : gnu_low;
1514 tree gnu_last = reversep ? gnu_low : gnu_high;
1515 enum tree_code end_code = reversep ? GE_EXPR : LE_EXPR;
1516 tree gnu_base_type = get_base_type (gnu_type);
1517 tree gnu_limit = (reversep ? TYPE_MIN_VALUE (gnu_base_type)
1518 : TYPE_MAX_VALUE (gnu_base_type));
1520 /* We know the loop variable will not overflow if GNU_LAST is a constant
1521 and is not equal to GNU_LIMIT. If it might overflow, we have to move
1522 the limit test to the end of the loop. In that case, we have to test
1523 for an empty loop outside the loop. */
1524 if (TREE_CODE (gnu_last) != INTEGER_CST
1525 || TREE_CODE (gnu_limit) != INTEGER_CST
1526 || tree_int_cst_equal (gnu_last, gnu_limit))
1529 = build3 (COND_EXPR, void_type_node,
1530 build_binary_op (LE_EXPR, integer_type_node,
1532 NULL_TREE, alloc_stmt_list ());
1533 annotate_with_node (gnu_cond_expr, gnat_loop_spec);
1536 /* Open a new nesting level that will surround the loop to declare the
1537 loop index variable. */
1538 start_stmt_group ();
1541 /* Declare the loop index and set it to its initial value. */
1542 gnu_loop_var = gnat_to_gnu_entity (gnat_loop_var, gnu_first, 1);
1543 if (DECL_BY_REF_P (gnu_loop_var))
1544 gnu_loop_var = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_loop_var);
1546 /* The loop variable might be a padded type, so use `convert' to get a
1547 reference to the inner variable if so. */
1548 gnu_loop_var = convert (get_base_type (gnu_type), gnu_loop_var);
1550 /* Set either the top or bottom exit condition as appropriate depending
1551 on whether or not we know an overflow cannot occur. */
1553 LOOP_STMT_BOT_COND (gnu_loop_stmt)
1554 = build_binary_op (NE_EXPR, integer_type_node,
1555 gnu_loop_var, gnu_last);
1557 LOOP_STMT_TOP_COND (gnu_loop_stmt)
1558 = build_binary_op (end_code, integer_type_node,
1559 gnu_loop_var, gnu_last);
1561 LOOP_STMT_UPDATE (gnu_loop_stmt)
1562 = build_binary_op (reversep ? PREDECREMENT_EXPR
1563 : PREINCREMENT_EXPR,
1564 TREE_TYPE (gnu_loop_var),
1566 convert (TREE_TYPE (gnu_loop_var),
1568 annotate_with_node (LOOP_STMT_UPDATE (gnu_loop_stmt),
1572 /* If the loop was named, have the name point to this loop. In this case,
1573 the association is not a ..._DECL node, but the end label from this
1575 if (Present (Identifier (gnat_node)))
1576 save_gnu_tree (Entity (Identifier (gnat_node)),
1577 LOOP_STMT_LABEL (gnu_loop_stmt), true);
1579 /* Make the loop body into its own block, so any allocated storage will be
1580 released every iteration. This is needed for stack allocation. */
1581 LOOP_STMT_BODY (gnu_loop_stmt)
1582 = build_stmt_group (Statements (gnat_node), true);
1584 /* If we declared a variable, then we are in a statement group for that
1585 declaration. Add the LOOP_STMT to it and make that the "loop". */
1588 add_stmt (gnu_loop_stmt);
1590 gnu_loop_stmt = end_stmt_group ();
1593 /* If we have an outer COND_EXPR, that's our result and this loop is its
1594 "true" statement. Otherwise, the result is the LOOP_STMT. */
1597 COND_EXPR_THEN (gnu_cond_expr) = gnu_loop_stmt;
1598 gnu_result = gnu_cond_expr;
1599 recalculate_side_effects (gnu_cond_expr);
1602 gnu_result = gnu_loop_stmt;
1604 pop_stack (&gnu_loop_label_stack);
1609 /* Emit statements to establish __gnat_handle_vms_condition as a VMS condition
1610 handler for the current function. */
1612 /* This is implemented by issuing a call to the appropriate VMS specific
1613 builtin. To avoid having VMS specific sections in the global gigi decls
1614 array, we maintain the decls of interest here. We can't declare them
1615 inside the function because we must mark them never to be GC'd, which we
1616 can only do at the global level. */
1618 static GTY(()) tree vms_builtin_establish_handler_decl = NULL_TREE;
1619 static GTY(()) tree gnat_vms_condition_handler_decl = NULL_TREE;
1622 establish_gnat_vms_condition_handler (void)
1624 tree establish_stmt;
1626 /* Elaborate the required decls on the first call. Check on the decl for
1627 the gnat condition handler to decide, as this is one we create so we are
1628 sure that it will be non null on subsequent calls. The builtin decl is
1629 looked up so remains null on targets where it is not implemented yet. */
1630 if (gnat_vms_condition_handler_decl == NULL_TREE)
1632 vms_builtin_establish_handler_decl
1634 (get_identifier ("__builtin_establish_vms_condition_handler"));
1636 gnat_vms_condition_handler_decl
1637 = create_subprog_decl (get_identifier ("__gnat_handle_vms_condition"),
1639 build_function_type_list (integer_type_node,
1643 NULL_TREE, 0, 1, 1, 0, Empty);
1646 /* Do nothing if the establish builtin is not available, which might happen
1647 on targets where the facility is not implemented. */
1648 if (vms_builtin_establish_handler_decl == NULL_TREE)
1652 = build_call_1_expr (vms_builtin_establish_handler_decl,
1654 (ADDR_EXPR, NULL_TREE,
1655 gnat_vms_condition_handler_decl));
1657 add_stmt (establish_stmt);
1660 /* Subroutine of gnat_to_gnu to process gnat_node, an N_Subprogram_Body. We
1661 don't return anything. */
1664 Subprogram_Body_to_gnu (Node_Id gnat_node)
1666 /* Defining identifier of a parameter to the subprogram. */
1667 Entity_Id gnat_param;
1668 /* The defining identifier for the subprogram body. Note that if a
1669 specification has appeared before for this body, then the identifier
1670 occurring in that specification will also be a defining identifier and all
1671 the calls to this subprogram will point to that specification. */
1672 Entity_Id gnat_subprog_id
1673 = (Present (Corresponding_Spec (gnat_node))
1674 ? Corresponding_Spec (gnat_node) : Defining_Entity (gnat_node));
1675 /* The FUNCTION_DECL node corresponding to the subprogram spec. */
1676 tree gnu_subprog_decl;
1677 /* The FUNCTION_TYPE node corresponding to the subprogram spec. */
1678 tree gnu_subprog_type;
1681 VEC(parm_attr,gc) *cache;
1683 /* If this is a generic object or if it has been eliminated,
1685 if (Ekind (gnat_subprog_id) == E_Generic_Procedure
1686 || Ekind (gnat_subprog_id) == E_Generic_Function
1687 || Is_Eliminated (gnat_subprog_id))
1690 /* If this subprogram acts as its own spec, define it. Otherwise, just get
1691 the already-elaborated tree node. However, if this subprogram had its
1692 elaboration deferred, we will already have made a tree node for it. So
1693 treat it as not being defined in that case. Such a subprogram cannot
1694 have an address clause or a freeze node, so this test is safe, though it
1695 does disable some otherwise-useful error checking. */
1697 = gnat_to_gnu_entity (gnat_subprog_id, NULL_TREE,
1698 Acts_As_Spec (gnat_node)
1699 && !present_gnu_tree (gnat_subprog_id));
1701 gnu_subprog_type = TREE_TYPE (gnu_subprog_decl);
1703 /* Propagate the debug mode. */
1704 if (!Needs_Debug_Info (gnat_subprog_id))
1705 DECL_IGNORED_P (gnu_subprog_decl) = 1;
1707 /* Set the line number in the decl to correspond to that of the body so that
1708 the line number notes are written correctly. */
1709 Sloc_to_locus (Sloc (gnat_node), &DECL_SOURCE_LOCATION (gnu_subprog_decl));
1711 /* Initialize the information structure for the function. */
1712 allocate_struct_function (gnu_subprog_decl);
1713 DECL_STRUCT_FUNCTION (gnu_subprog_decl)->language
1714 = GGC_CNEW (struct language_function);
1716 begin_subprog_body (gnu_subprog_decl);
1717 gnu_cico_list = TYPE_CI_CO_LIST (gnu_subprog_type);
1719 /* If there are OUT parameters, we need to ensure that the return statement
1720 properly copies them out. We do this by making a new block and converting
1721 any inner return into a goto to a label at the end of the block. */
1722 push_stack (&gnu_return_label_stack, NULL_TREE,
1723 gnu_cico_list ? create_artificial_label () : NULL_TREE);
1725 /* Get a tree corresponding to the code for the subprogram. */
1726 start_stmt_group ();
1729 /* See if there are any parameters for which we don't yet have GCC entities.
1730 These must be for OUT parameters for which we will be making VAR_DECL
1731 nodes here. Fill them in to TYPE_CI_CO_LIST, which must contain the empty
1732 entry as well. We can match up the entries because TYPE_CI_CO_LIST is in
1733 the order of the parameters. */
1734 for (gnat_param = First_Formal_With_Extras (gnat_subprog_id);
1735 Present (gnat_param);
1736 gnat_param = Next_Formal_With_Extras (gnat_param))
1737 if (!present_gnu_tree (gnat_param))
1739 /* Skip any entries that have been already filled in; they must
1740 correspond to IN OUT parameters. */
1741 for (; gnu_cico_list && TREE_VALUE (gnu_cico_list);
1742 gnu_cico_list = TREE_CHAIN (gnu_cico_list))
1745 /* Do any needed references for padded types. */
1746 TREE_VALUE (gnu_cico_list)
1747 = convert (TREE_TYPE (TREE_PURPOSE (gnu_cico_list)),
1748 gnat_to_gnu_entity (gnat_param, NULL_TREE, 1));
1751 /* On VMS, establish our condition handler to possibly turn a condition into
1752 the corresponding exception if the subprogram has a foreign convention or
1755 To ensure proper execution of local finalizations on condition instances,
1756 we must turn a condition into the corresponding exception even if there
1757 is no applicable Ada handler, and need at least one condition handler per
1758 possible call chain involving GNAT code. OTOH, establishing the handler
1759 has a cost so we want to minimize the number of subprograms into which
1760 this happens. The foreign or exported condition is expected to satisfy
1761 all the constraints. */
1762 if (TARGET_ABI_OPEN_VMS
1763 && (Has_Foreign_Convention (gnat_node) || Is_Exported (gnat_node)))
1764 establish_gnat_vms_condition_handler ();
1766 process_decls (Declarations (gnat_node), Empty, Empty, true, true);
1768 /* Generate the code of the subprogram itself. A return statement will be
1769 present and any OUT parameters will be handled there. */
1770 add_stmt (gnat_to_gnu (Handled_Statement_Sequence (gnat_node)));
1772 gnu_result = end_stmt_group ();
1774 /* If we populated the parameter attributes cache, we need to make sure
1775 that the cached expressions are evaluated on all possible paths. */
1776 cache = DECL_STRUCT_FUNCTION (gnu_subprog_decl)->language->parm_attr_cache;
1779 struct parm_attr *pa;
1782 start_stmt_group ();
1784 for (i = 0; VEC_iterate (parm_attr, cache, i, pa); i++)
1787 add_stmt (pa->first);
1789 add_stmt (pa->last);
1791 add_stmt (pa->length);
1794 add_stmt (gnu_result);
1795 gnu_result = end_stmt_group ();
1798 /* If we made a special return label, we need to make a block that contains
1799 the definition of that label and the copying to the return value. That
1800 block first contains the function, then the label and copy statement. */
1801 if (TREE_VALUE (gnu_return_label_stack))
1805 start_stmt_group ();
1807 add_stmt (gnu_result);
1808 add_stmt (build1 (LABEL_EXPR, void_type_node,
1809 TREE_VALUE (gnu_return_label_stack)));
1811 gnu_cico_list = TYPE_CI_CO_LIST (gnu_subprog_type);
1812 if (list_length (gnu_cico_list) == 1)
1813 gnu_retval = TREE_VALUE (gnu_cico_list);
1815 gnu_retval = gnat_build_constructor (TREE_TYPE (gnu_subprog_type),
1818 if (DECL_P (gnu_retval) && DECL_BY_REF_P (gnu_retval))
1819 gnu_retval = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_retval);
1822 (build_return_expr (DECL_RESULT (gnu_subprog_decl), gnu_retval),
1825 gnu_result = end_stmt_group ();
1828 pop_stack (&gnu_return_label_stack);
1830 /* Set the end location. */
1832 ((Present (End_Label (Handled_Statement_Sequence (gnat_node)))
1833 ? Sloc (End_Label (Handled_Statement_Sequence (gnat_node)))
1834 : Sloc (gnat_node)),
1835 &DECL_STRUCT_FUNCTION (gnu_subprog_decl)->function_end_locus);
1837 end_subprog_body (gnu_result);
1839 /* Disconnect the trees for parameters that we made variables for from the
1840 GNAT entities since these are unusable after we end the function. */
1841 for (gnat_param = First_Formal_With_Extras (gnat_subprog_id);
1842 Present (gnat_param);
1843 gnat_param = Next_Formal_With_Extras (gnat_param))
1844 if (TREE_CODE (get_gnu_tree (gnat_param)) == VAR_DECL)
1845 save_gnu_tree (gnat_param, NULL_TREE, false);
1847 if (DECL_FUNCTION_STUB (gnu_subprog_decl))
1848 build_function_stub (gnu_subprog_decl, gnat_subprog_id);
1850 mark_out_of_scope (Defining_Unit_Name (Specification (gnat_node)));
1853 /* Subroutine of gnat_to_gnu to translate gnat_node, either an N_Function_Call
1854 or an N_Procedure_Call_Statement, to a GCC tree, which is returned.
1855 GNU_RESULT_TYPE_P is a pointer to where we should place the result type.
1856 If GNU_TARGET is non-null, this must be a function call and the result
1857 of the call is to be placed into that object. */
1860 call_to_gnu (Node_Id gnat_node, tree *gnu_result_type_p, tree gnu_target)
1863 /* The GCC node corresponding to the GNAT subprogram name. This can either
1864 be a FUNCTION_DECL node if we are dealing with a standard subprogram call,
1865 or an indirect reference expression (an INDIRECT_REF node) pointing to a
1867 tree gnu_subprog_node = gnat_to_gnu (Name (gnat_node));
1868 /* The FUNCTION_TYPE node giving the GCC type of the subprogram. */
1869 tree gnu_subprog_type = TREE_TYPE (gnu_subprog_node);
1870 tree gnu_subprog_addr = build_unary_op (ADDR_EXPR, NULL_TREE,
1872 Entity_Id gnat_formal;
1873 Node_Id gnat_actual;
1874 tree gnu_actual_list = NULL_TREE;
1875 tree gnu_name_list = NULL_TREE;
1876 tree gnu_before_list = NULL_TREE;
1877 tree gnu_after_list = NULL_TREE;
1878 tree gnu_subprog_call;
1880 switch (Nkind (Name (gnat_node)))
1883 case N_Operator_Symbol:
1884 case N_Expanded_Name:
1885 case N_Attribute_Reference:
1886 if (Is_Eliminated (Entity (Name (gnat_node))))
1887 Eliminate_Error_Msg (gnat_node, Entity (Name (gnat_node)));
1890 gcc_assert (TREE_CODE (gnu_subprog_type) == FUNCTION_TYPE);
1892 /* If we are calling a stubbed function, make this into a raise of
1893 Program_Error. Elaborate all our args first. */
1894 if (TREE_CODE (gnu_subprog_node) == FUNCTION_DECL
1895 && DECL_STUBBED_P (gnu_subprog_node))
1897 for (gnat_actual = First_Actual (gnat_node);
1898 Present (gnat_actual);
1899 gnat_actual = Next_Actual (gnat_actual))
1900 add_stmt (gnat_to_gnu (gnat_actual));
1904 = build_call_raise (PE_Stubbed_Subprogram_Called, gnat_node,
1905 N_Raise_Program_Error);
1907 if (Nkind (gnat_node) == N_Function_Call && !gnu_target)
1909 *gnu_result_type_p = TREE_TYPE (gnu_subprog_type);
1910 return build1 (NULL_EXPR, *gnu_result_type_p, call_expr);
1917 /* If we are calling by supplying a pointer to a target, set up that
1918 pointer as the first argument. Use GNU_TARGET if one was passed;
1919 otherwise, make a target by building a variable of the maximum size
1921 if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type))
1923 tree gnu_real_ret_type
1924 = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (gnu_subprog_type)));
1929 = maybe_pad_type (gnu_real_ret_type,
1930 max_size (TYPE_SIZE (gnu_real_ret_type), true),
1931 0, Etype (Name (gnat_node)), "PAD", false,
1934 /* ??? We may be about to create a static temporary if we happen to
1935 be at the global binding level. That's a regression from what
1936 the 3.x back-end would generate in the same situation, but we
1937 don't have a mechanism in Gigi for creating automatic variables
1938 in the elaboration routines. */
1940 = create_var_decl (create_tmp_var_name ("LR"), NULL, gnu_obj_type,
1941 NULL, false, false, false, false, NULL,
1946 = tree_cons (NULL_TREE,
1947 build_unary_op (ADDR_EXPR, NULL_TREE,
1948 unchecked_convert (gnu_real_ret_type,
1955 /* The only way we can be making a call via an access type is if Name is an
1956 explicit dereference. In that case, get the list of formal args from the
1957 type the access type is pointing to. Otherwise, get the formals from
1958 entity being called. */
1959 if (Nkind (Name (gnat_node)) == N_Explicit_Dereference)
1960 gnat_formal = First_Formal_With_Extras (Etype (Name (gnat_node)));
1961 else if (Nkind (Name (gnat_node)) == N_Attribute_Reference)
1962 /* Assume here that this must be 'Elab_Body or 'Elab_Spec. */
1965 gnat_formal = First_Formal_With_Extras (Entity (Name (gnat_node)));
1967 /* Create the list of the actual parameters as GCC expects it, namely a chain
1968 of TREE_LIST nodes in which the TREE_VALUE field of each node is a
1969 parameter-expression and the TREE_PURPOSE field is null. Skip OUT
1970 parameters not passed by reference and don't need to be copied in. */
1971 for (gnat_actual = First_Actual (gnat_node);
1972 Present (gnat_actual);
1973 gnat_formal = Next_Formal_With_Extras (gnat_formal),
1974 gnat_actual = Next_Actual (gnat_actual))
1977 = (present_gnu_tree (gnat_formal)
1978 ? get_gnu_tree (gnat_formal) : NULL_TREE);
1979 tree gnu_formal_type = gnat_to_gnu_type (Etype (gnat_formal));
1980 /* We treat a conversion between aggregate types as if it is an
1981 unchecked conversion. */
1982 bool unchecked_convert_p
1983 = (Nkind (gnat_actual) == N_Unchecked_Type_Conversion
1984 || (Nkind (gnat_actual) == N_Type_Conversion
1985 && Is_Composite_Type (Underlying_Type (Etype (gnat_formal)))));
1986 Node_Id gnat_name = (unchecked_convert_p
1987 ? Expression (gnat_actual) : gnat_actual);
1988 tree gnu_name = gnat_to_gnu (gnat_name);
1989 tree gnu_name_type = gnat_to_gnu_type (Etype (gnat_name));
1992 /* If it's possible we may need to use this expression twice, make sure
1993 than any side-effects are handled via SAVE_EXPRs. Likewise if we need
1994 to force side-effects before the call.
1996 ??? This is more conservative than we need since we don't need to do
1997 this for pass-by-ref with no conversion. If we are passing a
1998 non-addressable Out or In Out parameter by reference, pass the address
1999 of a copy and set up to copy back out after the call. */
2000 if (Ekind (gnat_formal) != E_In_Parameter)
2002 gnu_name = gnat_stabilize_reference (gnu_name, true);
2004 if (!addressable_p (gnu_name)
2006 && (DECL_BY_REF_P (gnu_formal)
2007 || (TREE_CODE (gnu_formal) == PARM_DECL
2008 && (DECL_BY_COMPONENT_PTR_P (gnu_formal)
2009 || (DECL_BY_DESCRIPTOR_P (gnu_formal))))))
2011 tree gnu_copy = gnu_name;
2014 /* If the type is by_reference, a copy is not allowed. */
2015 if (Is_By_Reference_Type (Etype (gnat_formal)))
2017 ("misaligned & cannot be passed by reference", gnat_actual);
2019 /* For users of Starlet we issue a warning because the
2020 interface apparently assumes that by-ref parameters
2021 outlive the procedure invocation. The code still
2022 will not work as intended, but we cannot do much
2023 better since other low-level parts of the back-end
2024 would allocate temporaries at will because of the
2025 misalignment if we did not do so here. */
2027 else if (Is_Valued_Procedure (Entity (Name (gnat_node))))
2030 ("?possible violation of implicit assumption",
2033 ("?made by pragma Import_Valued_Procedure on &",
2034 gnat_actual, Entity (Name (gnat_node)));
2036 ("?because of misalignment of &",
2037 gnat_actual, gnat_formal);
2040 /* Remove any unpadding on the actual and make a copy. But if
2041 the actual is a justified modular type, first convert
2043 if (TREE_CODE (gnu_name) == COMPONENT_REF
2044 && ((TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_name, 0)))
2046 && (TYPE_IS_PADDING_P
2047 (TREE_TYPE (TREE_OPERAND (gnu_name, 0))))))
2048 gnu_name = gnu_copy = TREE_OPERAND (gnu_name, 0);
2049 else if (TREE_CODE (gnu_name_type) == RECORD_TYPE
2050 && (TYPE_JUSTIFIED_MODULAR_P (gnu_name_type)))
2051 gnu_name = convert (gnu_name_type, gnu_name);
2053 /* Make a SAVE_EXPR to both properly account for potential side
2054 effects and handle the creation of a temporary copy. Special
2055 code in gnat_gimplify_expr ensures that the same temporary is
2056 used as the actual and copied back after the call. */
2057 gnu_actual = save_expr (gnu_name);
2059 /* Set up to move the copy back to the original. */
2060 gnu_temp = build_binary_op (MODIFY_EXPR, NULL_TREE,
2061 gnu_copy, gnu_actual);
2062 annotate_with_node (gnu_temp, gnat_actual);
2063 append_to_statement_list (gnu_temp, &gnu_after_list);
2065 /* Account for next statement just below. */
2066 gnu_name = gnu_actual;
2070 /* If this was a procedure call, we may not have removed any padding.
2071 So do it here for the part we will use as an input, if any. */
2072 gnu_actual = gnu_name;
2073 if (Ekind (gnat_formal) != E_Out_Parameter
2074 && TREE_CODE (TREE_TYPE (gnu_actual)) == RECORD_TYPE
2075 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_actual)))
2076 gnu_actual = convert (get_unpadded_type (Etype (gnat_actual)),
2079 /* Unless this is an In parameter, we must remove any LJM building
2081 if (Ekind (gnat_formal) != E_In_Parameter
2082 && TREE_CODE (gnu_name) == CONSTRUCTOR
2083 && TREE_CODE (TREE_TYPE (gnu_name)) == RECORD_TYPE
2084 && TYPE_JUSTIFIED_MODULAR_P (TREE_TYPE (gnu_name)))
2085 gnu_name = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_name))),
2088 if (Ekind (gnat_formal) != E_Out_Parameter
2089 && !unchecked_convert_p
2090 && Do_Range_Check (gnat_actual))
2091 gnu_actual = emit_range_check (gnu_actual, Etype (gnat_formal));
2093 /* Do any needed conversions. We need only check for unchecked
2094 conversion since normal conversions will be handled by just
2095 converting to the formal type. */
2096 if (unchecked_convert_p)
2099 = unchecked_convert (gnat_to_gnu_type (Etype (gnat_actual)),
2101 (Nkind (gnat_actual)
2102 == N_Unchecked_Type_Conversion)
2103 && No_Truncation (gnat_actual));
2105 /* One we've done the unchecked conversion, we still must ensure that
2106 the object is in range of the formal's type. */
2107 if (Ekind (gnat_formal) != E_Out_Parameter
2108 && Do_Range_Check (gnat_actual))
2109 gnu_actual = emit_range_check (gnu_actual,
2110 Etype (gnat_formal));
2112 else if (TREE_CODE (gnu_actual) != SAVE_EXPR)
2113 /* We may have suppressed a conversion to the Etype of the actual since
2114 the parent is a procedure call. So add the conversion here. */
2115 gnu_actual = convert (gnat_to_gnu_type (Etype (gnat_actual)),
2118 if (TREE_CODE (gnu_actual) != SAVE_EXPR)
2119 gnu_actual = convert (gnu_formal_type, gnu_actual);
2121 /* If we have not saved a GCC object for the formal, it means it is an
2122 OUT parameter not passed by reference and that does not need to be
2123 copied in. Otherwise, look at the PARM_DECL to see if it is passed by
2126 && TREE_CODE (gnu_formal) == PARM_DECL && DECL_BY_REF_P (gnu_formal))
2128 if (Ekind (gnat_formal) != E_In_Parameter)
2130 gnu_actual = gnu_name;
2132 /* If we have a padded type, be sure we've removed padding. */
2133 if (TREE_CODE (TREE_TYPE (gnu_actual)) == RECORD_TYPE
2134 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_actual))
2135 && TREE_CODE (gnu_actual) != SAVE_EXPR)
2136 gnu_actual = convert (get_unpadded_type (Etype (gnat_actual)),
2139 /* If we have the constructed subtype of an aliased object
2140 with an unconstrained nominal subtype, the type of the
2141 actual includes the template, although it is formally
2142 constrained. So we need to convert it back to the real
2143 constructed subtype to retrieve the constrained part
2144 and takes its address. */
2145 if (TREE_CODE (TREE_TYPE (gnu_actual)) == RECORD_TYPE
2146 && TYPE_CONTAINS_TEMPLATE_P (TREE_TYPE (gnu_actual))
2147 && TREE_CODE (gnu_actual) != SAVE_EXPR
2148 && Is_Constr_Subt_For_UN_Aliased (Etype (gnat_actual))
2149 && Is_Array_Type (Etype (gnat_actual)))
2150 gnu_actual = convert (gnat_to_gnu_type (Etype (gnat_actual)),
2154 /* Otherwise, if we have a non-addressable COMPONENT_REF of a
2155 variable-size type see if it's doing a unpadding operation. If
2156 so, remove that operation since we have no way of allocating the
2157 required temporary. */
2158 if (TREE_CODE (gnu_actual) == COMPONENT_REF
2159 && !TREE_CONSTANT (TYPE_SIZE (TREE_TYPE (gnu_actual)))
2160 && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_actual, 0)))
2162 && TYPE_IS_PADDING_P (TREE_TYPE
2163 (TREE_OPERAND (gnu_actual, 0)))
2164 && !addressable_p (gnu_actual))
2165 gnu_actual = TREE_OPERAND (gnu_actual, 0);
2167 /* For In parameters, gnu_actual might still not be addressable at
2168 this point and we need the creation of a temporary copy since
2169 this is to be passed by ref. Resorting to save_expr to force a
2170 SAVE_EXPR temporary creation here is not guaranteed to work
2171 because the actual might be invariant or readonly without side
2172 effects, so we let the gimplifier process this case. */
2174 /* The symmetry of the paths to the type of an entity is broken here
2175 since arguments don't know that they will be passed by ref. */
2176 gnu_formal_type = TREE_TYPE (get_gnu_tree (gnat_formal));
2177 gnu_actual = build_unary_op (ADDR_EXPR, gnu_formal_type, gnu_actual);
2179 else if (gnu_formal && TREE_CODE (gnu_formal) == PARM_DECL
2180 && DECL_BY_COMPONENT_PTR_P (gnu_formal))
2182 gnu_formal_type = TREE_TYPE (get_gnu_tree (gnat_formal));
2183 gnu_actual = maybe_implicit_deref (gnu_actual);
2184 gnu_actual = maybe_unconstrained_array (gnu_actual);
2186 if (TREE_CODE (gnu_formal_type) == RECORD_TYPE
2187 && TYPE_IS_PADDING_P (gnu_formal_type))
2189 gnu_formal_type = TREE_TYPE (TYPE_FIELDS (gnu_formal_type));
2190 gnu_actual = convert (gnu_formal_type, gnu_actual);
2193 /* Take the address of the object and convert to the proper pointer
2194 type. We'd like to actually compute the address of the beginning
2195 of the array using an ADDR_EXPR of an ARRAY_REF, but there's a
2196 possibility that the ARRAY_REF might return a constant and we'd be
2197 getting the wrong address. Neither approach is exactly correct,
2198 but this is the most likely to work in all cases. */
2199 gnu_actual = convert (gnu_formal_type,
2200 build_unary_op (ADDR_EXPR, NULL_TREE,
2203 else if (gnu_formal && TREE_CODE (gnu_formal) == PARM_DECL
2204 && DECL_BY_DESCRIPTOR_P (gnu_formal))
2206 /* If arg is 'Null_Parameter, pass zero descriptor. */
2207 if ((TREE_CODE (gnu_actual) == INDIRECT_REF
2208 || TREE_CODE (gnu_actual) == UNCONSTRAINED_ARRAY_REF)
2209 && TREE_PRIVATE (gnu_actual))
2210 gnu_actual = convert (DECL_ARG_TYPE (get_gnu_tree (gnat_formal)),
2213 gnu_actual = build_unary_op (ADDR_EXPR, NULL_TREE,
2214 fill_vms_descriptor (gnu_actual,
2219 tree gnu_actual_size = TYPE_SIZE (TREE_TYPE (gnu_actual));
2221 if (Ekind (gnat_formal) != E_In_Parameter)
2222 gnu_name_list = tree_cons (NULL_TREE, gnu_name, gnu_name_list);
2224 if (!gnu_formal || TREE_CODE (gnu_formal) != PARM_DECL)
2227 /* If this is 'Null_Parameter, pass a zero even though we are
2228 dereferencing it. */
2229 else if (TREE_CODE (gnu_actual) == INDIRECT_REF
2230 && TREE_PRIVATE (gnu_actual)
2231 && host_integerp (gnu_actual_size, 1)
2232 && 0 >= compare_tree_int (gnu_actual_size,
2235 = unchecked_convert (DECL_ARG_TYPE (gnu_formal),
2236 convert (gnat_type_for_size
2237 (tree_low_cst (gnu_actual_size, 1),
2242 gnu_actual = convert (DECL_ARG_TYPE (gnu_formal), gnu_actual);
2245 gnu_actual_list = tree_cons (NULL_TREE, gnu_actual, gnu_actual_list);
2248 gnu_subprog_call = build_call_list (TREE_TYPE (gnu_subprog_type),
2250 nreverse (gnu_actual_list));
2252 /* If we return by passing a target, the result is the target after the
2253 call. We must not emit the call directly here because this might be
2254 evaluated as part of an expression with conditions to control whether
2255 the call should be emitted or not. */
2256 if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type))
2258 /* Conceptually, what we need is a COMPOUND_EXPR with the call followed
2259 by the target object converted to the proper type. Doing so would
2260 potentially be very inefficient, however, as this expresssion might
2261 end up wrapped into an outer SAVE_EXPR later on, which would incur a
2262 pointless temporary copy of the whole object.
2264 What we do instead is build a COMPOUND_EXPR returning the address of
2265 the target, and then dereference. Wrapping the COMPOUND_EXPR into a
2266 SAVE_EXPR later on then only incurs a pointer copy. */
2268 tree gnu_result_type
2269 = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (gnu_subprog_type)));
2272 (result_type) *[gnu_subprog_call (&gnu_target, ...), &gnu_target] */
2274 tree gnu_target_address
2275 = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_target);
2278 = build2 (COMPOUND_EXPR, TREE_TYPE (gnu_target_address),
2279 gnu_subprog_call, gnu_target_address);
2282 = unchecked_convert (gnu_result_type,
2283 build_unary_op (INDIRECT_REF, NULL_TREE,
2287 *gnu_result_type_p = gnu_result_type;
2291 /* If it is a function call, the result is the call expression unless
2292 a target is specified, in which case we copy the result into the target
2293 and return the assignment statement. */
2294 else if (Nkind (gnat_node) == N_Function_Call)
2296 gnu_result = gnu_subprog_call;
2298 /* If the function returns an unconstrained array or by reference,
2299 we have to de-dereference the pointer. */
2300 if (TYPE_RETURNS_UNCONSTRAINED_P (gnu_subprog_type)
2301 || TYPE_RETURNS_BY_REF_P (gnu_subprog_type))
2302 gnu_result = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_result);
2305 gnu_result = build_binary_op (MODIFY_EXPR, NULL_TREE,
2306 gnu_target, gnu_result);
2308 *gnu_result_type_p = get_unpadded_type (Etype (gnat_node));
2313 /* If this is the case where the GNAT tree contains a procedure call
2314 but the Ada procedure has copy in copy out parameters, the special
2315 parameter passing mechanism must be used. */
2316 else if (TYPE_CI_CO_LIST (gnu_subprog_type) != NULL_TREE)
2318 /* List of FIELD_DECLs associated with the PARM_DECLs of the copy
2319 in copy out parameters. */
2320 tree scalar_return_list = TYPE_CI_CO_LIST (gnu_subprog_type);
2321 int length = list_length (scalar_return_list);
2327 gnu_subprog_call = save_expr (gnu_subprog_call);
2328 gnu_name_list = nreverse (gnu_name_list);
2330 /* If any of the names had side-effects, ensure they are all
2331 evaluated before the call. */
2332 for (gnu_name = gnu_name_list; gnu_name;
2333 gnu_name = TREE_CHAIN (gnu_name))
2334 if (TREE_SIDE_EFFECTS (TREE_VALUE (gnu_name)))
2335 append_to_statement_list (TREE_VALUE (gnu_name),
2339 if (Nkind (Name (gnat_node)) == N_Explicit_Dereference)
2340 gnat_formal = First_Formal_With_Extras (Etype (Name (gnat_node)));
2342 gnat_formal = First_Formal_With_Extras (Entity (Name (gnat_node)));
2344 for (gnat_actual = First_Actual (gnat_node);
2345 Present (gnat_actual);
2346 gnat_formal = Next_Formal_With_Extras (gnat_formal),
2347 gnat_actual = Next_Actual (gnat_actual))
2348 /* If we are dealing with a copy in copy out parameter, we must
2349 retrieve its value from the record returned in the call. */
2350 if (!(present_gnu_tree (gnat_formal)
2351 && TREE_CODE (get_gnu_tree (gnat_formal)) == PARM_DECL
2352 && (DECL_BY_REF_P (get_gnu_tree (gnat_formal))
2353 || (TREE_CODE (get_gnu_tree (gnat_formal)) == PARM_DECL
2354 && ((DECL_BY_COMPONENT_PTR_P (get_gnu_tree (gnat_formal))
2355 || (DECL_BY_DESCRIPTOR_P
2356 (get_gnu_tree (gnat_formal))))))))
2357 && Ekind (gnat_formal) != E_In_Parameter)
2359 /* Get the value to assign to this OUT or IN OUT parameter. It is
2360 either the result of the function if there is only a single such
2361 parameter or the appropriate field from the record returned. */
2363 = length == 1 ? gnu_subprog_call
2364 : build_component_ref (gnu_subprog_call, NULL_TREE,
2365 TREE_PURPOSE (scalar_return_list),
2368 /* If the actual is a conversion, get the inner expression, which
2369 will be the real destination, and convert the result to the
2370 type of the actual parameter. */
2372 = maybe_unconstrained_array (TREE_VALUE (gnu_name_list));
2374 /* If the result is a padded type, remove the padding. */
2375 if (TREE_CODE (TREE_TYPE (gnu_result)) == RECORD_TYPE
2376 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_result)))
2377 gnu_result = convert (TREE_TYPE (TYPE_FIELDS
2378 (TREE_TYPE (gnu_result))),
2381 /* If the actual is a type conversion, the real target object is
2382 denoted by the inner Expression and we need to convert the
2383 result to the associated type.
2385 We also need to convert our gnu assignment target to this type
2386 if the corresponding gnu_name was constructed from the GNAT
2387 conversion node and not from the inner Expression. */
2388 if (Nkind (gnat_actual) == N_Type_Conversion)
2391 = convert_with_check
2392 (Etype (Expression (gnat_actual)), gnu_result,
2393 Do_Overflow_Check (gnat_actual),
2394 Do_Range_Check (Expression (gnat_actual)),
2395 Float_Truncate (gnat_actual));
2397 if (!Is_Composite_Type
2398 (Underlying_Type (Etype (gnat_formal))))
2400 = convert (TREE_TYPE (gnu_result), gnu_actual);
2403 /* Unchecked conversions as actuals for out parameters are not
2404 allowed in user code because they are not variables, but do
2405 occur in front-end expansions. The associated gnu_name is
2406 always obtained from the inner expression in such cases. */
2407 else if (Nkind (gnat_actual) == N_Unchecked_Type_Conversion)
2408 gnu_result = unchecked_convert (TREE_TYPE (gnu_actual),
2410 No_Truncation (gnat_actual));
2413 if (Do_Range_Check (gnat_actual))
2414 gnu_result = emit_range_check (gnu_result,
2415 Etype (gnat_actual));
2417 if (!(!TREE_CONSTANT (TYPE_SIZE (TREE_TYPE (gnu_actual)))
2418 && TREE_CONSTANT (TYPE_SIZE (TREE_TYPE (gnu_result)))))
2419 gnu_result = convert (TREE_TYPE (gnu_actual), gnu_result);
2422 gnu_result = build_binary_op (MODIFY_EXPR, NULL_TREE,
2423 gnu_actual, gnu_result);
2424 annotate_with_node (gnu_result, gnat_actual);
2425 append_to_statement_list (gnu_result, &gnu_before_list);
2426 scalar_return_list = TREE_CHAIN (scalar_return_list);
2427 gnu_name_list = TREE_CHAIN (gnu_name_list);
2432 annotate_with_node (gnu_subprog_call, gnat_node);
2433 append_to_statement_list (gnu_subprog_call, &gnu_before_list);
2436 append_to_statement_list (gnu_after_list, &gnu_before_list);
2437 return gnu_before_list;
2440 /* Subroutine of gnat_to_gnu to translate gnat_node, an
2441 N_Handled_Sequence_Of_Statements, to a GCC tree, which is returned. */
2444 Handled_Sequence_Of_Statements_to_gnu (Node_Id gnat_node)
2446 tree gnu_jmpsave_decl = NULL_TREE;
2447 tree gnu_jmpbuf_decl = NULL_TREE;
2448 /* If just annotating, ignore all EH and cleanups. */
2449 bool gcc_zcx = (!type_annotate_only
2450 && Present (Exception_Handlers (gnat_node))
2451 && Exception_Mechanism == Back_End_Exceptions);
2453 = (!type_annotate_only && Present (Exception_Handlers (gnat_node))
2454 && Exception_Mechanism == Setjmp_Longjmp);
2455 bool at_end = !type_annotate_only && Present (At_End_Proc (gnat_node));
2456 bool binding_for_block = (at_end || gcc_zcx || setjmp_longjmp);
2457 tree gnu_inner_block; /* The statement(s) for the block itself. */
2462 /* The GCC exception handling mechanism can handle both ZCX and SJLJ schemes
2463 and we have our own SJLJ mechanism. To call the GCC mechanism, we call
2464 add_cleanup, and when we leave the binding, end_stmt_group will create
2465 the TRY_FINALLY_EXPR.
2467 ??? The region level calls down there have been specifically put in place
2468 for a ZCX context and currently the order in which things are emitted
2469 (region/handlers) is different from the SJLJ case. Instead of putting
2470 other calls with different conditions at other places for the SJLJ case,
2471 it seems cleaner to reorder things for the SJLJ case and generalize the
2472 condition to make it not ZCX specific.
2474 If there are any exceptions or cleanup processing involved, we need an
2475 outer statement group (for Setjmp_Longjmp) and binding level. */
2476 if (binding_for_block)
2478 start_stmt_group ();
2482 /* If using setjmp_longjmp, make the variables for the setjmp buffer and save
2483 area for address of previous buffer. Do this first since we need to have
2484 the setjmp buf known for any decls in this block. */
2487 gnu_jmpsave_decl = create_var_decl (get_identifier ("JMPBUF_SAVE"),
2488 NULL_TREE, jmpbuf_ptr_type,
2489 build_call_0_expr (get_jmpbuf_decl),
2490 false, false, false, false, NULL,
2492 /* The __builtin_setjmp receivers will immediately reinstall it. Now
2493 because of the unstructured form of EH used by setjmp_longjmp, there
2494 might be forward edges going to __builtin_setjmp receivers on which
2495 it is uninitialized, although they will never be actually taken. */
2496 TREE_NO_WARNING (gnu_jmpsave_decl) = 1;
2497 gnu_jmpbuf_decl = create_var_decl (get_identifier ("JMP_BUF"),
2498 NULL_TREE, jmpbuf_type,
2499 NULL_TREE, false, false, false, false,
2502 set_block_jmpbuf_decl (gnu_jmpbuf_decl);
2504 /* When we exit this block, restore the saved value. */
2505 add_cleanup (build_call_1_expr (set_jmpbuf_decl, gnu_jmpsave_decl),
2506 End_Label (gnat_node));
2509 /* If we are to call a function when exiting this block, add a cleanup
2510 to the binding level we made above. Note that add_cleanup is FIFO
2511 so we must register this cleanup after the EH cleanup just above. */
2513 add_cleanup (build_call_0_expr (gnat_to_gnu (At_End_Proc (gnat_node))),
2514 End_Label (gnat_node));
2516 /* Now build the tree for the declarations and statements inside this block.
2517 If this is SJLJ, set our jmp_buf as the current buffer. */
2518 start_stmt_group ();
2521 add_stmt (build_call_1_expr (set_jmpbuf_decl,
2522 build_unary_op (ADDR_EXPR, NULL_TREE,
2525 if (Present (First_Real_Statement (gnat_node)))
2526 process_decls (Statements (gnat_node), Empty,
2527 First_Real_Statement (gnat_node), true, true);
2529 /* Generate code for each statement in the block. */
2530 for (gnat_temp = (Present (First_Real_Statement (gnat_node))
2531 ? First_Real_Statement (gnat_node)
2532 : First (Statements (gnat_node)));
2533 Present (gnat_temp); gnat_temp = Next (gnat_temp))
2534 add_stmt (gnat_to_gnu (gnat_temp));
2535 gnu_inner_block = end_stmt_group ();
2537 /* Now generate code for the two exception models, if either is relevant for
2541 tree *gnu_else_ptr = 0;
2544 /* Make a binding level for the exception handling declarations and code
2545 and set up gnu_except_ptr_stack for the handlers to use. */
2546 start_stmt_group ();
2549 push_stack (&gnu_except_ptr_stack, NULL_TREE,
2550 create_var_decl (get_identifier ("EXCEPT_PTR"),
2552 build_pointer_type (except_type_node),
2553 build_call_0_expr (get_excptr_decl), false,
2554 false, false, false, NULL, gnat_node));
2556 /* Generate code for each handler. The N_Exception_Handler case does the
2557 real work and returns a COND_EXPR for each handler, which we chain
2559 for (gnat_temp = First_Non_Pragma (Exception_Handlers (gnat_node));
2560 Present (gnat_temp); gnat_temp = Next_Non_Pragma (gnat_temp))
2562 gnu_expr = gnat_to_gnu (gnat_temp);
2564 /* If this is the first one, set it as the outer one. Otherwise,
2565 point the "else" part of the previous handler to us. Then point
2566 to our "else" part. */
2568 add_stmt (gnu_expr);
2570 *gnu_else_ptr = gnu_expr;
2572 gnu_else_ptr = &COND_EXPR_ELSE (gnu_expr);
2575 /* If none of the exception handlers did anything, re-raise but do not
2577 gnu_expr = build_call_1_expr (raise_nodefer_decl,
2578 TREE_VALUE (gnu_except_ptr_stack));
2579 annotate_with_node (gnu_expr, gnat_node);
2582 *gnu_else_ptr = gnu_expr;
2584 add_stmt (gnu_expr);
2586 /* End the binding level dedicated to the exception handlers and get the
2587 whole statement group. */
2588 pop_stack (&gnu_except_ptr_stack);
2590 gnu_handler = end_stmt_group ();
2592 /* If the setjmp returns 1, we restore our incoming longjmp value and
2593 then check the handlers. */
2594 start_stmt_group ();
2595 add_stmt_with_node (build_call_1_expr (set_jmpbuf_decl,
2598 add_stmt (gnu_handler);
2599 gnu_handler = end_stmt_group ();
2601 /* This block is now "if (setjmp) ... <handlers> else <block>". */
2602 gnu_result = build3 (COND_EXPR, void_type_node,
2605 build_unary_op (ADDR_EXPR, NULL_TREE,
2607 gnu_handler, gnu_inner_block);
2613 /* First make a block containing the handlers. */
2614 start_stmt_group ();
2615 for (gnat_temp = First_Non_Pragma (Exception_Handlers (gnat_node));
2616 Present (gnat_temp);
2617 gnat_temp = Next_Non_Pragma (gnat_temp))
2618 add_stmt (gnat_to_gnu (gnat_temp));
2619 gnu_handlers = end_stmt_group ();
2621 /* Now make the TRY_CATCH_EXPR for the block. */
2622 gnu_result = build2 (TRY_CATCH_EXPR, void_type_node,
2623 gnu_inner_block, gnu_handlers);
2626 gnu_result = gnu_inner_block;
2628 /* Now close our outer block, if we had to make one. */
2629 if (binding_for_block)
2631 add_stmt (gnu_result);
2633 gnu_result = end_stmt_group ();
2639 /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Exception_Handler,
2640 to a GCC tree, which is returned. This is the variant for Setjmp_Longjmp
2641 exception handling. */
2644 Exception_Handler_to_gnu_sjlj (Node_Id gnat_node)
2646 /* Unless this is "Others" or the special "Non-Ada" exception for Ada, make
2647 an "if" statement to select the proper exceptions. For "Others", exclude
2648 exceptions where Handled_By_Others is nonzero unless the All_Others flag
2649 is set. For "Non-ada", accept an exception if "Lang" is 'V'. */
2650 tree gnu_choice = integer_zero_node;
2651 tree gnu_body = build_stmt_group (Statements (gnat_node), false);
2654 for (gnat_temp = First (Exception_Choices (gnat_node));
2655 gnat_temp; gnat_temp = Next (gnat_temp))
2659 if (Nkind (gnat_temp) == N_Others_Choice)
2661 if (All_Others (gnat_temp))
2662 this_choice = integer_one_node;
2666 (EQ_EXPR, integer_type_node,
2671 (INDIRECT_REF, NULL_TREE,
2672 TREE_VALUE (gnu_except_ptr_stack)),
2673 get_identifier ("not_handled_by_others"), NULL_TREE,
2678 else if (Nkind (gnat_temp) == N_Identifier
2679 || Nkind (gnat_temp) == N_Expanded_Name)
2681 Entity_Id gnat_ex_id = Entity (gnat_temp);
2684 /* Exception may be a renaming. Recover original exception which is
2685 the one elaborated and registered. */
2686 if (Present (Renamed_Object (gnat_ex_id)))
2687 gnat_ex_id = Renamed_Object (gnat_ex_id);
2689 gnu_expr = gnat_to_gnu_entity (gnat_ex_id, NULL_TREE, 0);
2693 (EQ_EXPR, integer_type_node, TREE_VALUE (gnu_except_ptr_stack),
2694 convert (TREE_TYPE (TREE_VALUE (gnu_except_ptr_stack)),
2695 build_unary_op (ADDR_EXPR, NULL_TREE, gnu_expr)));
2697 /* If this is the distinguished exception "Non_Ada_Error" (and we are
2698 in VMS mode), also allow a non-Ada exception (a VMS condition) t
2700 if (Is_Non_Ada_Error (Entity (gnat_temp)))
2703 = build_component_ref
2704 (build_unary_op (INDIRECT_REF, NULL_TREE,
2705 TREE_VALUE (gnu_except_ptr_stack)),
2706 get_identifier ("lang"), NULL_TREE, false);
2710 (TRUTH_ORIF_EXPR, integer_type_node,
2711 build_binary_op (EQ_EXPR, integer_type_node, gnu_comp,
2712 build_int_cst (TREE_TYPE (gnu_comp), 'V')),
2719 gnu_choice = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
2720 gnu_choice, this_choice);
2723 return build3 (COND_EXPR, void_type_node, gnu_choice, gnu_body, NULL_TREE);
2726 /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Exception_Handler,
2727 to a GCC tree, which is returned. This is the variant for ZCX. */
2730 Exception_Handler_to_gnu_zcx (Node_Id gnat_node)
2732 tree gnu_etypes_list = NULL_TREE;
2735 tree gnu_current_exc_ptr;
2736 tree gnu_incoming_exc_ptr;
2739 /* We build a TREE_LIST of nodes representing what exception types this
2740 handler can catch, with special cases for others and all others cases.
2742 Each exception type is actually identified by a pointer to the exception
2743 id, or to a dummy object for "others" and "all others".
2745 Care should be taken to ensure that the control flow impact of "others"
2746 and "all others" is known to GCC. lang_eh_type_covers is doing the trick
2748 for (gnat_temp = First (Exception_Choices (gnat_node));
2749 gnat_temp; gnat_temp = Next (gnat_temp))
2751 if (Nkind (gnat_temp) == N_Others_Choice)
2754 = All_Others (gnat_temp) ? all_others_decl : others_decl;
2757 = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_expr);
2759 else if (Nkind (gnat_temp) == N_Identifier
2760 || Nkind (gnat_temp) == N_Expanded_Name)
2762 Entity_Id gnat_ex_id = Entity (gnat_temp);
2764 /* Exception may be a renaming. Recover original exception which is
2765 the one elaborated and registered. */
2766 if (Present (Renamed_Object (gnat_ex_id)))
2767 gnat_ex_id = Renamed_Object (gnat_ex_id);
2769 gnu_expr = gnat_to_gnu_entity (gnat_ex_id, NULL_TREE, 0);
2770 gnu_etype = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_expr);
2772 /* The Non_Ada_Error case for VMS exceptions is handled
2773 by the personality routine. */
2778 /* The GCC interface expects NULL to be passed for catch all handlers, so
2779 it would be quite tempting to set gnu_etypes_list to NULL if gnu_etype
2780 is integer_zero_node. It would not work, however, because GCC's
2781 notion of "catch all" is stronger than our notion of "others". Until
2782 we correctly use the cleanup interface as well, doing that would
2783 prevent the "all others" handlers from being seen, because nothing
2784 can be caught beyond a catch all from GCC's point of view. */
2785 gnu_etypes_list = tree_cons (NULL_TREE, gnu_etype, gnu_etypes_list);
2788 start_stmt_group ();
2791 /* Expand a call to the begin_handler hook at the beginning of the handler,
2792 and arrange for a call to the end_handler hook to occur on every possible
2795 The hooks expect a pointer to the low level occurrence. This is required
2796 for our stack management scheme because a raise inside the handler pushes
2797 a new occurrence on top of the stack, which means that this top does not
2798 necessarily match the occurrence this handler was dealing with.
2800 The EXC_PTR_EXPR object references the exception occurrence being
2801 propagated. Upon handler entry, this is the exception for which the
2802 handler is triggered. This might not be the case upon handler exit,
2803 however, as we might have a new occurrence propagated by the handler's
2804 body, and the end_handler hook called as a cleanup in this context.
2806 We use a local variable to retrieve the incoming value at handler entry
2807 time, and reuse it to feed the end_handler hook's argument at exit. */
2808 gnu_current_exc_ptr = build0 (EXC_PTR_EXPR, ptr_type_node);
2809 gnu_incoming_exc_ptr = create_var_decl (get_identifier ("EXPTR"), NULL_TREE,
2810 ptr_type_node, gnu_current_exc_ptr,
2811 false, false, false, false, NULL,
2814 add_stmt_with_node (build_call_1_expr (begin_handler_decl,
2815 gnu_incoming_exc_ptr),
2817 /* ??? We don't seem to have an End_Label at hand to set the location. */
2818 add_cleanup (build_call_1_expr (end_handler_decl, gnu_incoming_exc_ptr),
2820 add_stmt_list (Statements (gnat_node));
2823 return build2 (CATCH_EXPR, void_type_node, gnu_etypes_list,
2827 /* Subroutine of gnat_to_gnu to generate code for an N_Compilation unit. */
2830 Compilation_Unit_to_gnu (Node_Id gnat_node)
2832 /* Make the decl for the elaboration procedure. */
2833 bool body_p = (Defining_Entity (Unit (gnat_node)),
2834 Nkind (Unit (gnat_node)) == N_Package_Body
2835 || Nkind (Unit (gnat_node)) == N_Subprogram_Body);
2836 Entity_Id gnat_unit_entity = Defining_Entity (Unit (gnat_node));
2837 tree gnu_elab_proc_decl
2838 = create_subprog_decl
2839 (create_concat_name (gnat_unit_entity,
2840 body_p ? "elabb" : "elabs"),
2841 NULL_TREE, void_ftype, NULL_TREE, false, true, false, NULL,
2843 struct elab_info *info;
2845 push_stack (&gnu_elab_proc_stack, NULL_TREE, gnu_elab_proc_decl);
2847 DECL_ELABORATION_PROC_P (gnu_elab_proc_decl) = 1;
2848 allocate_struct_function (gnu_elab_proc_decl);
2849 Sloc_to_locus (Sloc (gnat_unit_entity), &cfun->function_end_locus);
2852 /* For a body, first process the spec if there is one. */
2853 if (Nkind (Unit (gnat_node)) == N_Package_Body
2854 || (Nkind (Unit (gnat_node)) == N_Subprogram_Body
2855 && !Acts_As_Spec (gnat_node)))
2857 add_stmt (gnat_to_gnu (Library_Unit (gnat_node)));
2858 finalize_from_with_types ();
2861 process_inlined_subprograms (gnat_node);
2863 if (type_annotate_only && gnat_node == Cunit (Main_Unit))
2865 elaborate_all_entities (gnat_node);
2867 if (Nkind (Unit (gnat_node)) == N_Subprogram_Declaration
2868 || Nkind (Unit (gnat_node)) == N_Generic_Package_Declaration
2869 || Nkind (Unit (gnat_node)) == N_Generic_Subprogram_Declaration)
2873 process_decls (Declarations (Aux_Decls_Node (gnat_node)), Empty, Empty,
2875 add_stmt (gnat_to_gnu (Unit (gnat_node)));
2877 /* Process any pragmas and actions following the unit. */
2878 add_stmt_list (Pragmas_After (Aux_Decls_Node (gnat_node)));
2879 add_stmt_list (Actions (Aux_Decls_Node (gnat_node)));
2880 finalize_from_with_types ();
2882 /* Save away what we've made so far and record this potential elaboration
2884 info = (struct elab_info *) ggc_alloc (sizeof (struct elab_info));
2885 set_current_block_context (gnu_elab_proc_decl);
2887 DECL_SAVED_TREE (gnu_elab_proc_decl) = end_stmt_group ();
2888 info->next = elab_info_list;
2889 info->elab_proc = gnu_elab_proc_decl;
2890 info->gnat_node = gnat_node;
2891 elab_info_list = info;
2893 /* Generate elaboration code for this unit, if necessary, and say whether
2895 pop_stack (&gnu_elab_proc_stack);
2897 /* Invalidate the global renaming pointers. This is necessary because
2898 stabilization of the renamed entities may create SAVE_EXPRs which
2899 have been tied to a specific elaboration routine just above. */
2900 invalidate_global_renaming_pointers ();
2903 /* This function is the driver of the GNAT to GCC tree transformation
2904 process. It is the entry point of the tree transformer. GNAT_NODE is the
2905 root of some GNAT tree. Return the root of the corresponding GCC tree.
2906 If this is an expression, return the GCC equivalent of the expression. If
2907 it is a statement, return the statement. In the case when called for a
2908 statement, it may also add statements to the current statement group, in
2909 which case anything it returns is to be interpreted as occurring after
2910 anything `it already added. */
2913 gnat_to_gnu (Node_Id gnat_node)
2915 bool went_into_elab_proc = false;
2916 tree gnu_result = error_mark_node; /* Default to no value. */
2917 tree gnu_result_type = void_type_node;
2919 tree gnu_lhs, gnu_rhs;
2922 /* Save node number for error message and set location information. */
2923 error_gnat_node = gnat_node;
2924 Sloc_to_locus (Sloc (gnat_node), &input_location);
2926 if (type_annotate_only
2927 && IN (Nkind (gnat_node), N_Statement_Other_Than_Procedure_Call))
2928 return alloc_stmt_list ();
2930 /* If this node is a non-static subexpression and we are only
2931 annotating types, make this into a NULL_EXPR. */
2932 if (type_annotate_only
2933 && IN (Nkind (gnat_node), N_Subexpr)
2934 && Nkind (gnat_node) != N_Identifier
2935 && !Compile_Time_Known_Value (gnat_node))
2936 return build1 (NULL_EXPR, get_unpadded_type (Etype (gnat_node)),
2937 build_call_raise (CE_Range_Check_Failed, gnat_node,
2938 N_Raise_Constraint_Error));
2940 /* If this is a Statement and we are at top level, it must be part of the
2941 elaboration procedure, so mark us as being in that procedure and push our
2944 If we are in the elaboration procedure, check if we are violating a a
2945 No_Elaboration_Code restriction by having a statement there. */
2946 if ((IN (Nkind (gnat_node), N_Statement_Other_Than_Procedure_Call)
2947 && Nkind (gnat_node) != N_Null_Statement)
2948 || Nkind (gnat_node) == N_Procedure_Call_Statement
2949 || Nkind (gnat_node) == N_Label
2950 || Nkind (gnat_node) == N_Implicit_Label_Declaration
2951 || Nkind (gnat_node) == N_Handled_Sequence_Of_Statements
2952 || ((Nkind (gnat_node) == N_Raise_Constraint_Error
2953 || Nkind (gnat_node) == N_Raise_Storage_Error
2954 || Nkind (gnat_node) == N_Raise_Program_Error)
2955 && (Ekind (Etype (gnat_node)) == E_Void)))
2957 if (!current_function_decl)
2959 current_function_decl = TREE_VALUE (gnu_elab_proc_stack);
2960 start_stmt_group ();
2962 went_into_elab_proc = true;
2965 /* Don't check for a possible No_Elaboration_Code restriction violation
2966 on N_Handled_Sequence_Of_Statements, as we want to signal an error on
2967 every nested real statement instead. This also avoids triggering
2968 spurious errors on dummy (empty) sequences created by the front-end
2969 for package bodies in some cases. */
2971 if (current_function_decl == TREE_VALUE (gnu_elab_proc_stack)
2972 && Nkind (gnat_node) != N_Handled_Sequence_Of_Statements)
2973 Check_Elaboration_Code_Allowed (gnat_node);
2976 switch (Nkind (gnat_node))
2978 /********************************/
2979 /* Chapter 2: Lexical Elements: */
2980 /********************************/
2983 case N_Expanded_Name:
2984 case N_Operator_Symbol:
2985 case N_Defining_Identifier:
2986 gnu_result = Identifier_to_gnu (gnat_node, &gnu_result_type);
2989 case N_Integer_Literal:
2993 /* Get the type of the result, looking inside any padding and
2994 justified modular types. Then get the value in that type. */
2995 gnu_type = gnu_result_type = get_unpadded_type (Etype (gnat_node));
2997 if (TREE_CODE (gnu_type) == RECORD_TYPE
2998 && TYPE_JUSTIFIED_MODULAR_P (gnu_type))
2999 gnu_type = TREE_TYPE (TYPE_FIELDS (gnu_type));
3001 gnu_result = UI_To_gnu (Intval (gnat_node), gnu_type);
3003 /* If the result overflows (meaning it doesn't fit in its base type),
3004 abort. We would like to check that the value is within the range
3005 of the subtype, but that causes problems with subtypes whose usage
3006 will raise Constraint_Error and with biased representation, so
3008 gcc_assert (!TREE_OVERFLOW (gnu_result));
3012 case N_Character_Literal:
3013 /* If a Entity is present, it means that this was one of the
3014 literals in a user-defined character type. In that case,
3015 just return the value in the CONST_DECL. Otherwise, use the
3016 character code. In that case, the base type should be an
3017 INTEGER_TYPE, but we won't bother checking for that. */
3018 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3019 if (Present (Entity (gnat_node)))
3020 gnu_result = DECL_INITIAL (get_gnu_tree (Entity (gnat_node)));
3023 = build_int_cst_type
3024 (gnu_result_type, UI_To_CC (Char_Literal_Value (gnat_node)));
3027 case N_Real_Literal:
3028 /* If this is of a fixed-point type, the value we want is the
3029 value of the corresponding integer. */
3030 if (IN (Ekind (Underlying_Type (Etype (gnat_node))), Fixed_Point_Kind))
3032 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3033 gnu_result = UI_To_gnu (Corresponding_Integer_Value (gnat_node),
3035 gcc_assert (!TREE_OVERFLOW (gnu_result));
3038 /* We should never see a Vax_Float type literal, since the front end
3039 is supposed to transform these using appropriate conversions */
3040 else if (Vax_Float (Underlying_Type (Etype (gnat_node))))
3045 Ureal ur_realval = Realval (gnat_node);
3047 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3049 /* If the real value is zero, so is the result. Otherwise,
3050 convert it to a machine number if it isn't already. That
3051 forces BASE to 0 or 2 and simplifies the rest of our logic. */
3052 if (UR_Is_Zero (ur_realval))
3053 gnu_result = convert (gnu_result_type, integer_zero_node);
3056 if (!Is_Machine_Number (gnat_node))
3058 = Machine (Base_Type (Underlying_Type (Etype (gnat_node))),
3059 ur_realval, Round_Even, gnat_node);
3062 = UI_To_gnu (Numerator (ur_realval), gnu_result_type);
3064 /* If we have a base of zero, divide by the denominator.
3065 Otherwise, the base must be 2 and we scale the value, which
3066 we know can fit in the mantissa of the type (hence the use
3067 of that type above). */
3068 if (No (Rbase (ur_realval)))
3070 = build_binary_op (RDIV_EXPR,
3071 get_base_type (gnu_result_type),
3073 UI_To_gnu (Denominator (ur_realval),
3077 REAL_VALUE_TYPE tmp;
3079 gcc_assert (Rbase (ur_realval) == 2);
3080 real_ldexp (&tmp, &TREE_REAL_CST (gnu_result),
3081 - UI_To_Int (Denominator (ur_realval)));
3082 gnu_result = build_real (gnu_result_type, tmp);
3086 /* Now see if we need to negate the result. Do it this way to
3087 properly handle -0. */
3088 if (UR_Is_Negative (Realval (gnat_node)))
3090 = build_unary_op (NEGATE_EXPR, get_base_type (gnu_result_type),
3096 case N_String_Literal:
3097 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3098 if (TYPE_PRECISION (TREE_TYPE (gnu_result_type)) == HOST_BITS_PER_CHAR)
3100 String_Id gnat_string = Strval (gnat_node);
3101 int length = String_Length (gnat_string);
3102 char *string = (char *) alloca (length + 1);
3105 /* Build the string with the characters in the literal. Note
3106 that Ada strings are 1-origin. */
3107 for (i = 0; i < length; i++)
3108 string[i] = Get_String_Char (gnat_string, i + 1);
3110 /* Put a null at the end of the string in case it's in a context
3111 where GCC will want to treat it as a C string. */
3114 gnu_result = build_string (length, string);
3116 /* Strings in GCC don't normally have types, but we want
3117 this to not be converted to the array type. */
3118 TREE_TYPE (gnu_result) = gnu_result_type;
3122 /* Build a list consisting of each character, then make
3124 String_Id gnat_string = Strval (gnat_node);
3125 int length = String_Length (gnat_string);
3127 tree gnu_list = NULL_TREE;
3128 tree gnu_idx = TYPE_MIN_VALUE (TYPE_DOMAIN (gnu_result_type));
3130 for (i = 0; i < length; i++)
3133 = tree_cons (gnu_idx,
3134 build_int_cst (TREE_TYPE (gnu_result_type),
3135 Get_String_Char (gnat_string,
3139 gnu_idx = int_const_binop (PLUS_EXPR, gnu_idx, integer_one_node,
3144 = gnat_build_constructor (gnu_result_type, nreverse (gnu_list));
3149 gnu_result = Pragma_to_gnu (gnat_node);
3152 /**************************************/
3153 /* Chapter 3: Declarations and Types: */
3154 /**************************************/
3156 case N_Subtype_Declaration:
3157 case N_Full_Type_Declaration:
3158 case N_Incomplete_Type_Declaration:
3159 case N_Private_Type_Declaration:
3160 case N_Private_Extension_Declaration:
3161 case N_Task_Type_Declaration:
3162 process_type (Defining_Entity (gnat_node));
3163 gnu_result = alloc_stmt_list ();
3166 case N_Object_Declaration:
3167 case N_Exception_Declaration:
3168 gnat_temp = Defining_Entity (gnat_node);
3169 gnu_result = alloc_stmt_list ();
3171 /* If we are just annotating types and this object has an unconstrained
3172 or task type, don't elaborate it. */
3173 if (type_annotate_only
3174 && (((Is_Array_Type (Etype (gnat_temp))
3175 || Is_Record_Type (Etype (gnat_temp)))
3176 && !Is_Constrained (Etype (gnat_temp)))
3177 || Is_Concurrent_Type (Etype (gnat_temp))))
3180 if (Present (Expression (gnat_node))
3181 && !(Nkind (gnat_node) == N_Object_Declaration
3182 && No_Initialization (gnat_node))
3183 && (!type_annotate_only
3184 || Compile_Time_Known_Value (Expression (gnat_node))))
3186 gnu_expr = gnat_to_gnu (Expression (gnat_node));
3187 if (Do_Range_Check (Expression (gnat_node)))
3188 gnu_expr = emit_range_check (gnu_expr, Etype (gnat_temp));
3190 /* If this object has its elaboration delayed, we must force
3191 evaluation of GNU_EXPR right now and save it for when the object
3193 if (Present (Freeze_Node (gnat_temp)))
3195 if ((Is_Public (gnat_temp) || global_bindings_p ())
3196 && !TREE_CONSTANT (gnu_expr))
3198 = create_var_decl (create_concat_name (gnat_temp, "init"),
3199 NULL_TREE, TREE_TYPE (gnu_expr),
3200 gnu_expr, false, Is_Public (gnat_temp),
3201 false, false, NULL, gnat_temp);
3203 gnu_expr = maybe_variable (gnu_expr);
3205 save_gnu_tree (gnat_node, gnu_expr, true);
3209 gnu_expr = NULL_TREE;
3211 if (type_annotate_only && gnu_expr && TREE_CODE (gnu_expr) == ERROR_MARK)
3212 gnu_expr = NULL_TREE;
3214 if (No (Freeze_Node (gnat_temp)))
3215 gnat_to_gnu_entity (gnat_temp, gnu_expr, 1);
3218 case N_Object_Renaming_Declaration:
3219 gnat_temp = Defining_Entity (gnat_node);
3221 /* Don't do anything if this renaming is handled by the front end or if
3222 we are just annotating types and this object has a composite or task
3223 type, don't elaborate it. We return the result in case it has any
3224 SAVE_EXPRs in it that need to be evaluated here. */
3225 if (!Is_Renaming_Of_Object (gnat_temp)
3226 && ! (type_annotate_only
3227 && (Is_Array_Type (Etype (gnat_temp))
3228 || Is_Record_Type (Etype (gnat_temp))
3229 || Is_Concurrent_Type (Etype (gnat_temp)))))
3231 = gnat_to_gnu_entity (gnat_temp,
3232 gnat_to_gnu (Renamed_Object (gnat_temp)), 1);
3234 gnu_result = alloc_stmt_list ();
3237 case N_Implicit_Label_Declaration:
3238 gnat_to_gnu_entity (Defining_Entity (gnat_node), NULL_TREE, 1);
3239 gnu_result = alloc_stmt_list ();
3242 case N_Exception_Renaming_Declaration:
3243 case N_Number_Declaration:
3244 case N_Package_Renaming_Declaration:
3245 case N_Subprogram_Renaming_Declaration:
3246 /* These are fully handled in the front end. */
3247 gnu_result = alloc_stmt_list ();
3250 /*************************************/
3251 /* Chapter 4: Names and Expressions: */
3252 /*************************************/
3254 case N_Explicit_Dereference:
3255 gnu_result = gnat_to_gnu (Prefix (gnat_node));
3256 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3257 gnu_result = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_result);
3260 case N_Indexed_Component:
3262 tree gnu_array_object = gnat_to_gnu (Prefix (gnat_node));
3266 Node_Id *gnat_expr_array;
3268 gnu_array_object = maybe_implicit_deref (gnu_array_object);
3269 gnu_array_object = maybe_unconstrained_array (gnu_array_object);
3271 /* If we got a padded type, remove it too. */
3272 if (TREE_CODE (TREE_TYPE (gnu_array_object)) == RECORD_TYPE
3273 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_array_object)))
3275 = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_array_object))),
3278 gnu_result = gnu_array_object;
3280 /* First compute the number of dimensions of the array, then
3281 fill the expression array, the order depending on whether
3282 this is a Convention_Fortran array or not. */
3283 for (ndim = 1, gnu_type = TREE_TYPE (gnu_array_object);
3284 TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE
3285 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type));
3286 ndim++, gnu_type = TREE_TYPE (gnu_type))
3289 gnat_expr_array = (Node_Id *) alloca (ndim * sizeof (Node_Id));
3291 if (TYPE_CONVENTION_FORTRAN_P (TREE_TYPE (gnu_array_object)))
3292 for (i = ndim - 1, gnat_temp = First (Expressions (gnat_node));
3294 i--, gnat_temp = Next (gnat_temp))
3295 gnat_expr_array[i] = gnat_temp;
3297 for (i = 0, gnat_temp = First (Expressions (gnat_node));
3299 i++, gnat_temp = Next (gnat_temp))
3300 gnat_expr_array[i] = gnat_temp;
3302 for (i = 0, gnu_type = TREE_TYPE (gnu_array_object);
3303 i < ndim; i++, gnu_type = TREE_TYPE (gnu_type))
3305 gcc_assert (TREE_CODE (gnu_type) == ARRAY_TYPE);
3306 gnat_temp = gnat_expr_array[i];
3307 gnu_expr = gnat_to_gnu (gnat_temp);
3309 if (Do_Range_Check (gnat_temp))
3312 (gnu_array_object, gnu_expr,
3313 TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))),
3314 TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))));
3316 gnu_result = build_binary_op (ARRAY_REF, NULL_TREE,
3317 gnu_result, gnu_expr);
3321 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3327 Node_Id gnat_range_node = Discrete_Range (gnat_node);
3329 gnu_result = gnat_to_gnu (Prefix (gnat_node));
3330 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3332 /* Do any implicit dereferences of the prefix and do any needed
3334 gnu_result = maybe_implicit_deref (gnu_result);
3335 gnu_result = maybe_unconstrained_array (gnu_result);
3336 gnu_type = TREE_TYPE (gnu_result);
3337 if (Do_Range_Check (gnat_range_node))
3339 /* Get the bounds of the slice. */
3341 = TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_result_type));
3342 tree gnu_min_expr = TYPE_MIN_VALUE (gnu_index_type);
3343 tree gnu_max_expr = TYPE_MAX_VALUE (gnu_index_type);
3344 /* Get the permitted bounds. */
3345 tree gnu_base_index_type
3346 = TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type));
3347 tree gnu_base_min_expr = TYPE_MIN_VALUE (gnu_base_index_type);
3348 tree gnu_base_max_expr = TYPE_MAX_VALUE (gnu_base_index_type);
3349 tree gnu_expr_l, gnu_expr_h, gnu_expr_type;
3351 /* Check to see that the minimum slice value is in range. */
3352 gnu_expr_l = emit_index_check (gnu_result,
3357 /* Check to see that the maximum slice value is in range. */
3358 gnu_expr_h = emit_index_check (gnu_result,
3363 /* Derive a good type to convert everything to. */
3364 gnu_expr_type = get_base_type (TREE_TYPE (gnu_expr_l));
3366 /* Build a compound expression that does the range checks and
3367 returns the low bound. */
3368 gnu_expr = build_binary_op (COMPOUND_EXPR, gnu_expr_type,
3369 convert (gnu_expr_type, gnu_expr_h),
3370 convert (gnu_expr_type, gnu_expr_l));
3372 /* Build a conditional expression that does the range check and
3373 returns the low bound if the slice is not empty (max >= min),
3374 and returns the naked low bound otherwise (max < min), unless
3375 it is non-constant and the high bound is; this prevents VRP
3376 from inferring bogus ranges on the unlikely path. */
3377 gnu_expr = fold_build3 (COND_EXPR, gnu_expr_type,
3378 build_binary_op (GE_EXPR, gnu_expr_type,
3379 convert (gnu_expr_type,
3381 convert (gnu_expr_type,
3384 TREE_CODE (gnu_min_expr) != INTEGER_CST
3385 && TREE_CODE (gnu_max_expr) == INTEGER_CST
3386 ? gnu_max_expr : gnu_min_expr);
3389 /* Simply return the naked low bound. */
3390 gnu_expr = TYPE_MIN_VALUE (TYPE_DOMAIN (gnu_result_type));
3392 gnu_result = build_binary_op (ARRAY_RANGE_REF, gnu_result_type,
3393 gnu_result, gnu_expr);
3397 case N_Selected_Component:
3399 tree gnu_prefix = gnat_to_gnu (Prefix (gnat_node));
3400 Entity_Id gnat_field = Entity (Selector_Name (gnat_node));
3401 Entity_Id gnat_pref_type = Etype (Prefix (gnat_node));
3404 while (IN (Ekind (gnat_pref_type), Incomplete_Or_Private_Kind)
3405 || IN (Ekind (gnat_pref_type), Access_Kind))
3407 if (IN (Ekind (gnat_pref_type), Incomplete_Or_Private_Kind))
3408 gnat_pref_type = Underlying_Type (gnat_pref_type);
3409 else if (IN (Ekind (gnat_pref_type), Access_Kind))
3410 gnat_pref_type = Designated_Type (gnat_pref_type);
3413 gnu_prefix = maybe_implicit_deref (gnu_prefix);
3415 /* For discriminant references in tagged types always substitute the
3416 corresponding discriminant as the actual selected component. */
3418 if (Is_Tagged_Type (gnat_pref_type))
3419 while (Present (Corresponding_Discriminant (gnat_field)))
3420 gnat_field = Corresponding_Discriminant (gnat_field);
3422 /* For discriminant references of untagged types always substitute the
3423 corresponding stored discriminant. */
3425 else if (Present (Corresponding_Discriminant (gnat_field)))
3426 gnat_field = Original_Record_Component (gnat_field);
3428 /* Handle extracting the real or imaginary part of a complex.
3429 The real part is the first field and the imaginary the last. */
3431 if (TREE_CODE (TREE_TYPE (gnu_prefix)) == COMPLEX_TYPE)
3432 gnu_result = build_unary_op (Present (Next_Entity (gnat_field))
3433 ? REALPART_EXPR : IMAGPART_EXPR,
3434 NULL_TREE, gnu_prefix);
3437 gnu_field = gnat_to_gnu_field_decl (gnat_field);
3439 /* If there are discriminants, the prefix might be
3440 evaluated more than once, which is a problem if it has
3442 if (Has_Discriminants (Is_Access_Type (Etype (Prefix (gnat_node)))
3443 ? Designated_Type (Etype
3444 (Prefix (gnat_node)))
3445 : Etype (Prefix (gnat_node))))
3446 gnu_prefix = gnat_stabilize_reference (gnu_prefix, false);
3449 = build_component_ref (gnu_prefix, NULL_TREE, gnu_field,
3450 (Nkind (Parent (gnat_node))
3451 == N_Attribute_Reference));
3454 gcc_assert (gnu_result);
3455 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3459 case N_Attribute_Reference:
3461 /* The attribute designator (like an enumeration value). */
3462 int attribute = Get_Attribute_Id (Attribute_Name (gnat_node));
3464 /* The Elab_Spec and Elab_Body attributes are special in that
3465 Prefix is a unit, not an object with a GCC equivalent. Similarly
3466 for Elaborated, since that variable isn't otherwise known. */
3467 if (attribute == Attr_Elab_Body || attribute == Attr_Elab_Spec)
3468 return (create_subprog_decl
3469 (create_concat_name (Entity (Prefix (gnat_node)),
3470 attribute == Attr_Elab_Body
3471 ? "elabb" : "elabs"),
3472 NULL_TREE, void_ftype, NULL_TREE, false, true, true, NULL,
3475 /* Check for 'Address of a subprogram or function that has
3476 a Freeze_Node and whose saved tree is an ADDR_EXPR. If we have
3477 such, return that ADDR_EXPR. */
3478 if (attribute == Attr_Address
3479 && Nkind (Prefix (gnat_node)) == N_Identifier
3480 && (Ekind (Entity (Prefix (gnat_node))) == E_Function
3481 || Ekind (Entity (Prefix (gnat_node))) == E_Procedure)
3482 && Present (Freeze_Node (Entity (Prefix (gnat_node))))
3483 && present_gnu_tree (Entity (Prefix (gnat_node)))
3484 && (TREE_CODE (get_gnu_tree (Entity (Prefix (gnat_node))))
3486 return TREE_PURPOSE (get_gnu_tree (Entity (Prefix (gnat_node))));
3488 gnu_result = Attribute_to_gnu (gnat_node, &gnu_result_type, attribute);
3493 /* Like 'Access as far as we are concerned. */
3494 gnu_result = gnat_to_gnu (Prefix (gnat_node));
3495 gnu_result = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_result);
3496 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3500 case N_Extension_Aggregate:
3504 /* ??? It is wrong to evaluate the type now, but there doesn't
3505 seem to be any other practical way of doing it. */
3507 gcc_assert (!Expansion_Delayed (gnat_node));
3509 gnu_aggr_type = gnu_result_type
3510 = get_unpadded_type (Etype (gnat_node));
3512 if (TREE_CODE (gnu_result_type) == RECORD_TYPE
3513 && TYPE_CONTAINS_TEMPLATE_P (gnu_result_type))
3515 = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_result_type)));
3517 if (Null_Record_Present (gnat_node))
3518 gnu_result = gnat_build_constructor (gnu_aggr_type, NULL_TREE);
3520 else if (TREE_CODE (gnu_aggr_type) == RECORD_TYPE
3521 || TREE_CODE (gnu_aggr_type) == UNION_TYPE)
3523 = assoc_to_constructor (Etype (gnat_node),
3524 First (Component_Associations (gnat_node)),
3526 else if (TREE_CODE (gnu_aggr_type) == ARRAY_TYPE)
3527 gnu_result = pos_to_constructor (First (Expressions (gnat_node)),
3529 Component_Type (Etype (gnat_node)));
3530 else if (TREE_CODE (gnu_aggr_type) == COMPLEX_TYPE)
3533 (COMPLEX_EXPR, gnu_aggr_type,
3534 gnat_to_gnu (Expression (First
3535 (Component_Associations (gnat_node)))),
3536 gnat_to_gnu (Expression
3538 (First (Component_Associations (gnat_node))))));
3542 gnu_result = convert (gnu_result_type, gnu_result);
3547 gnu_result = null_pointer_node;
3548 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3551 case N_Type_Conversion:
3552 case N_Qualified_Expression:
3553 /* Get the operand expression. */
3554 gnu_result = gnat_to_gnu (Expression (gnat_node));
3555 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3558 = convert_with_check (Etype (gnat_node), gnu_result,
3559 Do_Overflow_Check (gnat_node),
3560 Do_Range_Check (Expression (gnat_node)),
3561 Nkind (gnat_node) == N_Type_Conversion
3562 && Float_Truncate (gnat_node));
3565 case N_Unchecked_Type_Conversion:
3566 gnu_result = gnat_to_gnu (Expression (gnat_node));
3567 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3569 /* If the result is a pointer type, see if we are improperly
3570 converting to a stricter alignment. */
3572 if (STRICT_ALIGNMENT && POINTER_TYPE_P (gnu_result_type)
3573 && IN (Ekind (Etype (gnat_node)), Access_Kind))
3575 unsigned int align = known_alignment (gnu_result);
3576 tree gnu_obj_type = TREE_TYPE (gnu_result_type);
3577 unsigned int oalign = TYPE_ALIGN (gnu_obj_type);
3579 if (align != 0 && align < oalign && !TYPE_ALIGN_OK (gnu_obj_type))
3580 post_error_ne_tree_2
3581 ("?source alignment (^) '< alignment of & (^)",
3582 gnat_node, Designated_Type (Etype (gnat_node)),
3583 size_int (align / BITS_PER_UNIT), oalign / BITS_PER_UNIT);
3586 gnu_result = unchecked_convert (gnu_result_type, gnu_result,
3587 No_Truncation (gnat_node));
3593 tree gnu_object = gnat_to_gnu (Left_Opnd (gnat_node));
3594 Node_Id gnat_range = Right_Opnd (gnat_node);
3598 /* GNAT_RANGE is either an N_Range node or an identifier
3599 denoting a subtype. */
3600 if (Nkind (gnat_range) == N_Range)
3602 gnu_low = gnat_to_gnu (Low_Bound (gnat_range));
3603 gnu_high = gnat_to_gnu (High_Bound (gnat_range));
3605 else if (Nkind (gnat_range) == N_Identifier
3606 || Nkind (gnat_range) == N_Expanded_Name)
3608 tree gnu_range_type = get_unpadded_type (Entity (gnat_range));
3610 gnu_low = TYPE_MIN_VALUE (gnu_range_type);
3611 gnu_high = TYPE_MAX_VALUE (gnu_range_type);
3616 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3618 /* If LOW and HIGH are identical, perform an equality test.
3619 Otherwise, ensure that GNU_OBJECT is only evaluated once
3620 and perform a full range test. */
3621 if (operand_equal_p (gnu_low, gnu_high, 0))
3622 gnu_result = build_binary_op (EQ_EXPR, gnu_result_type,
3623 gnu_object, gnu_low);
3626 gnu_object = protect_multiple_eval (gnu_object);
3628 = build_binary_op (TRUTH_ANDIF_EXPR, gnu_result_type,
3629 build_binary_op (GE_EXPR, gnu_result_type,
3630 gnu_object, gnu_low),
3631 build_binary_op (LE_EXPR, gnu_result_type,
3632 gnu_object, gnu_high));
3635 if (Nkind (gnat_node) == N_Not_In)
3636 gnu_result = invert_truthvalue (gnu_result);
3641 gnu_lhs = gnat_to_gnu (Left_Opnd (gnat_node));
3642 gnu_rhs = gnat_to_gnu (Right_Opnd (gnat_node));
3643 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3644 gnu_result = build_binary_op (FLOAT_TYPE_P (gnu_result_type)
3646 : (Rounded_Result (gnat_node)
3647 ? ROUND_DIV_EXPR : TRUNC_DIV_EXPR),
3648 gnu_result_type, gnu_lhs, gnu_rhs);
3651 case N_Op_Or: case N_Op_And: case N_Op_Xor:
3652 /* These can either be operations on booleans or on modular types.
3653 Fall through for boolean types since that's the way GNU_CODES is
3655 if (IN (Ekind (Underlying_Type (Etype (gnat_node))),
3656 Modular_Integer_Kind))
3659 = (Nkind (gnat_node) == N_Op_Or ? BIT_IOR_EXPR
3660 : Nkind (gnat_node) == N_Op_And ? BIT_AND_EXPR
3663 gnu_lhs = gnat_to_gnu (Left_Opnd (gnat_node));
3664 gnu_rhs = gnat_to_gnu (Right_Opnd (gnat_node));
3665 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3666 gnu_result = build_binary_op (code, gnu_result_type,
3671 /* ... fall through ... */
3673 case N_Op_Eq: case N_Op_Ne: case N_Op_Lt:
3674 case N_Op_Le: case N_Op_Gt: case N_Op_Ge:
3675 case N_Op_Add: case N_Op_Subtract: case N_Op_Multiply:
3676 case N_Op_Mod: case N_Op_Rem:
3677 case N_Op_Rotate_Left:
3678 case N_Op_Rotate_Right:
3679 case N_Op_Shift_Left:
3680 case N_Op_Shift_Right:
3681 case N_Op_Shift_Right_Arithmetic:
3682 case N_And_Then: case N_Or_Else:
3684 enum tree_code code = gnu_codes[Nkind (gnat_node)];
3685 bool ignore_lhs_overflow = false;
3688 gnu_lhs = gnat_to_gnu (Left_Opnd (gnat_node));
3689 gnu_rhs = gnat_to_gnu (Right_Opnd (gnat_node));
3690 gnu_type = gnu_result_type = get_unpadded_type (Etype (gnat_node));
3692 /* If this is a comparison operator, convert any references to
3693 an unconstrained array value into a reference to the
3695 if (TREE_CODE_CLASS (code) == tcc_comparison)
3697 gnu_lhs = maybe_unconstrained_array (gnu_lhs);
3698 gnu_rhs = maybe_unconstrained_array (gnu_rhs);
3701 /* If the result type is a private type, its full view may be a
3702 numeric subtype. The representation we need is that of its base
3703 type, given that it is the result of an arithmetic operation. */
3704 else if (Is_Private_Type (Etype (gnat_node)))
3705 gnu_type = gnu_result_type
3706 = get_unpadded_type (Base_Type (Full_View (Etype (gnat_node))));
3708 /* If this is a shift whose count is not guaranteed to be correct,
3709 we need to adjust the shift count. */
3710 if (IN (Nkind (gnat_node), N_Op_Shift)
3711 && !Shift_Count_OK (gnat_node))
3713 tree gnu_count_type = get_base_type (TREE_TYPE (gnu_rhs));
3715 = convert (gnu_count_type, TYPE_SIZE (gnu_type));
3717 if (Nkind (gnat_node) == N_Op_Rotate_Left
3718 || Nkind (gnat_node) == N_Op_Rotate_Right)
3719 gnu_rhs = build_binary_op (TRUNC_MOD_EXPR, gnu_count_type,
3720 gnu_rhs, gnu_max_shift);
3721 else if (Nkind (gnat_node) == N_Op_Shift_Right_Arithmetic)
3724 (MIN_EXPR, gnu_count_type,
3725 build_binary_op (MINUS_EXPR,
3728 convert (gnu_count_type,
3733 /* For right shifts, the type says what kind of shift to do,
3734 so we may need to choose a different type. In this case,
3735 we have to ignore integer overflow lest it propagates all
3736 the way down and causes a CE to be explicitly raised. */
3737 if (Nkind (gnat_node) == N_Op_Shift_Right
3738 && !TYPE_UNSIGNED (gnu_type))
3740 gnu_type = gnat_unsigned_type (gnu_type);
3741 ignore_lhs_overflow = true;
3743 else if (Nkind (gnat_node) == N_Op_Shift_Right_Arithmetic
3744 && TYPE_UNSIGNED (gnu_type))
3746 gnu_type = gnat_signed_type (gnu_type);
3747 ignore_lhs_overflow = true;
3750 if (gnu_type != gnu_result_type)
3752 tree gnu_old_lhs = gnu_lhs;
3753 gnu_lhs = convert (gnu_type, gnu_lhs);
3754 if (TREE_CODE (gnu_lhs) == INTEGER_CST && ignore_lhs_overflow)
3755 TREE_OVERFLOW (gnu_lhs) = TREE_OVERFLOW (gnu_old_lhs);
3756 gnu_rhs = convert (gnu_type, gnu_rhs);
3759 gnu_result = build_binary_op (code, gnu_type, gnu_lhs, gnu_rhs);
3761 /* If this is a logical shift with the shift count not verified,
3762 we must return zero if it is too large. We cannot compensate
3763 above in this case. */
3764 if ((Nkind (gnat_node) == N_Op_Shift_Left
3765 || Nkind (gnat_node) == N_Op_Shift_Right)
3766 && !Shift_Count_OK (gnat_node))
3770 build_binary_op (GE_EXPR, integer_type_node,
3772 convert (TREE_TYPE (gnu_rhs),
3773 TYPE_SIZE (gnu_type))),
3774 convert (gnu_type, integer_zero_node),
3779 case N_Conditional_Expression:
3781 tree gnu_cond = gnat_to_gnu (First (Expressions (gnat_node)));
3782 tree gnu_true = gnat_to_gnu (Next (First (Expressions (gnat_node))));
3784 = gnat_to_gnu (Next (Next (First (Expressions (gnat_node)))));
3786 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3787 gnu_result = build_cond_expr (gnu_result_type,
3788 gnat_truthvalue_conversion (gnu_cond),
3789 gnu_true, gnu_false);
3794 gnu_result = gnat_to_gnu (Right_Opnd (gnat_node));
3795 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3799 /* This case can apply to a boolean or a modular type.
3800 Fall through for a boolean operand since GNU_CODES is set
3801 up to handle this. */
3802 if (Is_Modular_Integer_Type (Etype (gnat_node))
3803 || (Ekind (Etype (gnat_node)) == E_Private_Type
3804 && Is_Modular_Integer_Type (Full_View (Etype (gnat_node)))))
3806 gnu_expr = gnat_to_gnu (Right_Opnd (gnat_node));
3807 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3808 gnu_result = build_unary_op (BIT_NOT_EXPR, gnu_result_type,
3813 /* ... fall through ... */
3815 case N_Op_Minus: case N_Op_Abs:
3816 gnu_expr = gnat_to_gnu (Right_Opnd (gnat_node));
3818 if (Ekind (Etype (gnat_node)) != E_Private_Type)
3819 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3821 gnu_result_type = get_unpadded_type (Base_Type
3822 (Full_View (Etype (gnat_node))));
3824 gnu_result = build_unary_op (gnu_codes[Nkind (gnat_node)],
3825 gnu_result_type, gnu_expr);
3832 bool ignore_init_type = false;
3834 gnat_temp = Expression (gnat_node);
3836 /* The Expression operand can either be an N_Identifier or
3837 Expanded_Name, which must represent a type, or a
3838 N_Qualified_Expression, which contains both the object type and an
3839 initial value for the object. */
3840 if (Nkind (gnat_temp) == N_Identifier
3841 || Nkind (gnat_temp) == N_Expanded_Name)
3842 gnu_type = gnat_to_gnu_type (Entity (gnat_temp));
3843 else if (Nkind (gnat_temp) == N_Qualified_Expression)
3845 Entity_Id gnat_desig_type
3846 = Designated_Type (Underlying_Type (Etype (gnat_node)));
3848 ignore_init_type = Has_Constrained_Partial_View (gnat_desig_type);
3849 gnu_init = gnat_to_gnu (Expression (gnat_temp));
3851 gnu_init = maybe_unconstrained_array (gnu_init);
3852 if (Do_Range_Check (Expression (gnat_temp)))
3853 gnu_init = emit_range_check (gnu_init, gnat_desig_type);
3855 if (Is_Elementary_Type (gnat_desig_type)
3856 || Is_Constrained (gnat_desig_type))
3858 gnu_type = gnat_to_gnu_type (gnat_desig_type);
3859 gnu_init = convert (gnu_type, gnu_init);
3863 gnu_type = gnat_to_gnu_type (Etype (Expression (gnat_temp)));
3864 if (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
3865 gnu_type = TREE_TYPE (gnu_init);
3867 gnu_init = convert (gnu_type, gnu_init);
3873 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3874 return build_allocator (gnu_type, gnu_init, gnu_result_type,
3875 Procedure_To_Call (gnat_node),
3876 Storage_Pool (gnat_node), gnat_node,
3881 /***************************/
3882 /* Chapter 5: Statements: */
3883 /***************************/
3886 gnu_result = build1 (LABEL_EXPR, void_type_node,
3887 gnat_to_gnu (Identifier (gnat_node)));
3890 case N_Null_Statement:
3891 gnu_result = alloc_stmt_list ();
3894 case N_Assignment_Statement:
3895 /* Get the LHS and RHS of the statement and convert any reference to an
3896 unconstrained array into a reference to the underlying array.
3897 If we are not to do range checking and the RHS is an N_Function_Call,
3898 pass the LHS to the call function. */
3899 gnu_lhs = maybe_unconstrained_array (gnat_to_gnu (Name (gnat_node)));
3901 /* If the type has a size that overflows, convert this into raise of
3902 Storage_Error: execution shouldn't have gotten here anyway. */
3903 if (TREE_CODE (TYPE_SIZE_UNIT (TREE_TYPE (gnu_lhs))) == INTEGER_CST
3904 && TREE_OVERFLOW (TYPE_SIZE_UNIT (TREE_TYPE (gnu_lhs))))
3905 gnu_result = build_call_raise (SE_Object_Too_Large, gnat_node,
3906 N_Raise_Storage_Error);
3907 else if (Nkind (Expression (gnat_node)) == N_Function_Call
3908 && !Do_Range_Check (Expression (gnat_node)))
3909 gnu_result = call_to_gnu (Expression (gnat_node),
3910 &gnu_result_type, gnu_lhs);
3914 = maybe_unconstrained_array (gnat_to_gnu (Expression (gnat_node)));
3916 /* If range check is needed, emit code to generate it */
3917 if (Do_Range_Check (Expression (gnat_node)))
3918 gnu_rhs = emit_range_check (gnu_rhs, Etype (Name (gnat_node)));
3921 = build_binary_op (MODIFY_EXPR, NULL_TREE, gnu_lhs, gnu_rhs);
3925 case N_If_Statement:
3927 tree *gnu_else_ptr; /* Point to put next "else if" or "else". */
3929 /* Make the outer COND_EXPR. Avoid non-determinism. */
3930 gnu_result = build3 (COND_EXPR, void_type_node,
3931 gnat_to_gnu (Condition (gnat_node)),
3932 NULL_TREE, NULL_TREE);
3933 COND_EXPR_THEN (gnu_result)
3934 = build_stmt_group (Then_Statements (gnat_node), false);
3935 TREE_SIDE_EFFECTS (gnu_result) = 1;
3936 gnu_else_ptr = &COND_EXPR_ELSE (gnu_result);
3938 /* Now make a COND_EXPR for each of the "else if" parts. Put each
3939 into the previous "else" part and point to where to put any
3940 outer "else". Also avoid non-determinism. */
3941 if (Present (Elsif_Parts (gnat_node)))
3942 for (gnat_temp = First (Elsif_Parts (gnat_node));
3943 Present (gnat_temp); gnat_temp = Next (gnat_temp))
3945 gnu_expr = build3 (COND_EXPR, void_type_node,
3946 gnat_to_gnu (Condition (gnat_temp)),
3947 NULL_TREE, NULL_TREE);
3948 COND_EXPR_THEN (gnu_expr)
3949 = build_stmt_group (Then_Statements (gnat_temp), false);
3950 TREE_SIDE_EFFECTS (gnu_expr) = 1;
3951 annotate_with_node (gnu_expr, gnat_temp);
3952 *gnu_else_ptr = gnu_expr;
3953 gnu_else_ptr = &COND_EXPR_ELSE (gnu_expr);
3956 *gnu_else_ptr = build_stmt_group (Else_Statements (gnat_node), false);
3960 case N_Case_Statement:
3961 gnu_result = Case_Statement_to_gnu (gnat_node);
3964 case N_Loop_Statement:
3965 gnu_result = Loop_Statement_to_gnu (gnat_node);
3968 case N_Block_Statement:
3969 start_stmt_group ();
3971 process_decls (Declarations (gnat_node), Empty, Empty, true, true);
3972 add_stmt (gnat_to_gnu (Handled_Statement_Sequence (gnat_node)));
3974 gnu_result = end_stmt_group ();
3976 if (Present (Identifier (gnat_node)))
3977 mark_out_of_scope (Entity (Identifier (gnat_node)));
3980 case N_Exit_Statement:
3982 = build2 (EXIT_STMT, void_type_node,
3983 (Present (Condition (gnat_node))
3984 ? gnat_to_gnu (Condition (gnat_node)) : NULL_TREE),
3985 (Present (Name (gnat_node))
3986 ? get_gnu_tree (Entity (Name (gnat_node)))
3987 : TREE_VALUE (gnu_loop_label_stack)));
3990 case N_Return_Statement:
3992 /* The gnu function type of the subprogram currently processed. */
3993 tree gnu_subprog_type = TREE_TYPE (current_function_decl);
3994 /* The return value from the subprogram. */
3995 tree gnu_ret_val = NULL_TREE;
3996 /* The place to put the return value. */
3999 /* If we are dealing with a "return;" from an Ada procedure with
4000 parameters passed by copy in copy out, we need to return a record
4001 containing the final values of these parameters. If the list
4002 contains only one entry, return just that entry.
4004 For a full description of the copy in copy out parameter mechanism,
4005 see the part of the gnat_to_gnu_entity routine dealing with the
4006 translation of subprograms.
4008 But if we have a return label defined, convert this into
4009 a branch to that label. */
4011 if (TREE_VALUE (gnu_return_label_stack))
4013 gnu_result = build1 (GOTO_EXPR, void_type_node,
4014 TREE_VALUE (gnu_return_label_stack));
4018 else if (TYPE_CI_CO_LIST (gnu_subprog_type))
4020 gnu_lhs = DECL_RESULT (current_function_decl);
4021 if (list_length (TYPE_CI_CO_LIST (gnu_subprog_type)) == 1)
4022 gnu_ret_val = TREE_VALUE (TYPE_CI_CO_LIST (gnu_subprog_type));
4025 = gnat_build_constructor (TREE_TYPE (gnu_subprog_type),
4026 TYPE_CI_CO_LIST (gnu_subprog_type));
4029 /* If the Ada subprogram is a function, we just need to return the
4030 expression. If the subprogram returns an unconstrained
4031 array, we have to allocate a new version of the result and
4032 return it. If we return by reference, return a pointer. */
4034 else if (Present (Expression (gnat_node)))
4036 /* If the current function returns by target pointer and we
4037 are doing a call, pass that target to the call. */
4038 if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type)
4039 && Nkind (Expression (gnat_node)) == N_Function_Call)
4042 = build_unary_op (INDIRECT_REF, NULL_TREE,
4043 DECL_ARGUMENTS (current_function_decl));
4044 gnu_result = call_to_gnu (Expression (gnat_node),
4045 &gnu_result_type, gnu_lhs);
4049 gnu_ret_val = gnat_to_gnu (Expression (gnat_node));
4051 if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type))
4052 /* The original return type was unconstrained so dereference
4053 the TARGET pointer in the actual return value's type. */
4055 = build_unary_op (INDIRECT_REF, TREE_TYPE (gnu_ret_val),
4056 DECL_ARGUMENTS (current_function_decl));
4058 gnu_lhs = DECL_RESULT (current_function_decl);
4060 /* Do not remove the padding from GNU_RET_VAL if the inner
4061 type is self-referential since we want to allocate the fixed
4062 size in that case. */
4063 if (TREE_CODE (gnu_ret_val) == COMPONENT_REF
4064 && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_ret_val, 0)))
4066 && (TYPE_IS_PADDING_P
4067 (TREE_TYPE (TREE_OPERAND (gnu_ret_val, 0))))
4068 && (CONTAINS_PLACEHOLDER_P
4069 (TYPE_SIZE (TREE_TYPE (gnu_ret_val)))))
4070 gnu_ret_val = TREE_OPERAND (gnu_ret_val, 0);
4072 if (TYPE_RETURNS_BY_REF_P (gnu_subprog_type)
4073 || By_Ref (gnat_node))
4075 = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_ret_val);
4077 else if (TYPE_RETURNS_UNCONSTRAINED_P (gnu_subprog_type))
4079 gnu_ret_val = maybe_unconstrained_array (gnu_ret_val);
4081 /* We have two cases: either the function returns with
4082 depressed stack or not. If not, we allocate on the
4083 secondary stack. If so, we allocate in the stack frame.
4084 if no copy is needed, the front end will set By_Ref,
4085 which we handle in the case above. */
4086 if (TYPE_RETURNS_STACK_DEPRESSED (gnu_subprog_type))
4088 = build_allocator (TREE_TYPE (gnu_ret_val),
4090 TREE_TYPE (gnu_subprog_type),
4091 0, -1, gnat_node, false);
4094 = build_allocator (TREE_TYPE (gnu_ret_val),
4096 TREE_TYPE (gnu_subprog_type),
4097 Procedure_To_Call (gnat_node),
4098 Storage_Pool (gnat_node),
4104 /* If the Ada subprogram is a regular procedure, just return. */
4105 gnu_lhs = NULL_TREE;
4107 if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type))
4110 gnu_result = build_binary_op (MODIFY_EXPR, NULL_TREE,
4111 gnu_lhs, gnu_ret_val);
4112 add_stmt_with_node (gnu_result, gnat_node);
4113 gnu_lhs = NULL_TREE;
4116 gnu_result = build_return_expr (gnu_lhs, gnu_ret_val);
4120 case N_Goto_Statement:
4121 gnu_result = build1 (GOTO_EXPR, void_type_node,
4122 gnat_to_gnu (Name (gnat_node)));
4125 /****************************/
4126 /* Chapter 6: Subprograms: */
4127 /****************************/
4129 case N_Subprogram_Declaration:
4130 /* Unless there is a freeze node, declare the subprogram. We consider
4131 this a "definition" even though we're not generating code for
4132 the subprogram because we will be making the corresponding GCC
4133 node here. If there is a freeze node, make a dummy ADDR_EXPR
4134 so we can take the address of this subprogram before its freeze
4135 point; we'll fill in the ADDR_EXPR later. Put that ADDR_EXPR
4136 into a TREE_LIST that contains space for the value specified
4137 in an Address clause. */
4138 if (Freeze_Node (Defining_Entity (Specification (gnat_node))))
4139 save_gnu_tree (Defining_Entity (Specification (gnat_node)),
4140 tree_cons (build1 (ADDR_EXPR,
4142 (make_node (FUNCTION_TYPE)),
4144 NULL_TREE, NULL_TREE),
4147 gnat_to_gnu_entity (Defining_Entity (Specification (gnat_node)),
4150 gnu_result = alloc_stmt_list ();
4153 case N_Abstract_Subprogram_Declaration:
4154 /* This subprogram doesn't exist for code generation purposes, but we
4155 have to elaborate the types of any parameters and result, unless
4156 they are imported types (nothing to generate in this case). */
4158 /* Process the parameter types first. */
4161 = First_Formal_With_Extras
4162 (Defining_Entity (Specification (gnat_node)));
4163 Present (gnat_temp);
4164 gnat_temp = Next_Formal_With_Extras (gnat_temp))
4165 if (Is_Itype (Etype (gnat_temp))
4166 && !From_With_Type (Etype (gnat_temp)))
4167 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
4170 /* Then the result type, set to Standard_Void_Type for procedures. */
4173 Entity_Id gnat_temp_type
4174 = Etype (Defining_Entity (Specification (gnat_node)));
4176 if (Is_Itype (gnat_temp_type) && !From_With_Type (gnat_temp_type))
4177 gnat_to_gnu_entity (Etype (gnat_temp_type), NULL_TREE, 0);
4180 gnu_result = alloc_stmt_list ();
4183 case N_Defining_Program_Unit_Name:
4184 /* For a child unit identifier go up a level to get the
4185 specification. We get this when we try to find the spec of
4186 a child unit package that is the compilation unit being compiled. */
4187 gnu_result = gnat_to_gnu (Parent (gnat_node));
4190 case N_Subprogram_Body:
4191 Subprogram_Body_to_gnu (gnat_node);
4192 gnu_result = alloc_stmt_list ();
4195 case N_Function_Call:
4196 case N_Procedure_Call_Statement:
4197 gnu_result = call_to_gnu (gnat_node, &gnu_result_type, NULL_TREE);
4200 /*************************/
4201 /* Chapter 7: Packages: */
4202 /*************************/
4204 case N_Package_Declaration:
4205 gnu_result = gnat_to_gnu (Specification (gnat_node));
4208 case N_Package_Specification:
4210 start_stmt_group ();
4211 process_decls (Visible_Declarations (gnat_node),
4212 Private_Declarations (gnat_node), Empty, true, true);
4213 gnu_result = end_stmt_group ();
4216 case N_Package_Body:
4218 /* If this is the body of a generic package - do nothing */
4219 if (Ekind (Corresponding_Spec (gnat_node)) == E_Generic_Package)
4221 gnu_result = alloc_stmt_list ();
4225 start_stmt_group ();
4226 process_decls (Declarations (gnat_node), Empty, Empty, true, true);
4228 if (Present (Handled_Statement_Sequence (gnat_node)))
4229 add_stmt (gnat_to_gnu (Handled_Statement_Sequence (gnat_node)));
4231 gnu_result = end_stmt_group ();
4234 /*********************************/
4235 /* Chapter 8: Visibility Rules: */
4236 /*********************************/
4238 case N_Use_Package_Clause:
4239 case N_Use_Type_Clause:
4240 /* Nothing to do here - but these may appear in list of declarations */
4241 gnu_result = alloc_stmt_list ();
4244 /***********************/
4245 /* Chapter 9: Tasks: */
4246 /***********************/
4248 case N_Protected_Type_Declaration:
4249 gnu_result = alloc_stmt_list ();
4252 case N_Single_Task_Declaration:
4253 gnat_to_gnu_entity (Defining_Entity (gnat_node), NULL_TREE, 1);
4254 gnu_result = alloc_stmt_list ();
4257 /***********************************************************/
4258 /* Chapter 10: Program Structure and Compilation Issues: */
4259 /***********************************************************/
4261 case N_Compilation_Unit:
4263 /* This is not called for the main unit, which is handled in function
4265 start_stmt_group ();
4268 Compilation_Unit_to_gnu (gnat_node);
4269 gnu_result = alloc_stmt_list ();
4272 case N_Subprogram_Body_Stub:
4273 case N_Package_Body_Stub:
4274 case N_Protected_Body_Stub:
4275 case N_Task_Body_Stub:
4276 /* Simply process whatever unit is being inserted. */
4277 gnu_result = gnat_to_gnu (Unit (Library_Unit (gnat_node)));
4281 gnu_result = gnat_to_gnu (Proper_Body (gnat_node));
4284 /***************************/
4285 /* Chapter 11: Exceptions: */
4286 /***************************/
4288 case N_Handled_Sequence_Of_Statements:
4289 /* If there is an At_End procedure attached to this node, and the EH
4290 mechanism is SJLJ, we must have at least a corresponding At_End
4291 handler, unless the No_Exception_Handlers restriction is set. */
4292 gcc_assert (type_annotate_only
4293 || Exception_Mechanism != Setjmp_Longjmp
4294 || No (At_End_Proc (gnat_node))
4295 || Present (Exception_Handlers (gnat_node))
4296 || No_Exception_Handlers_Set ());
4298 gnu_result = Handled_Sequence_Of_Statements_to_gnu (gnat_node);
4301 case N_Exception_Handler:
4302 if (Exception_Mechanism == Setjmp_Longjmp)
4303 gnu_result = Exception_Handler_to_gnu_sjlj (gnat_node);
4304 else if (Exception_Mechanism == Back_End_Exceptions)
4305 gnu_result = Exception_Handler_to_gnu_zcx (gnat_node);
4311 case N_Push_Constraint_Error_Label:
4312 push_exception_label_stack (&gnu_constraint_error_label_stack,
4313 Exception_Label (gnat_node));
4316 case N_Push_Storage_Error_Label:
4317 push_exception_label_stack (&gnu_storage_error_label_stack,
4318 Exception_Label (gnat_node));
4321 case N_Push_Program_Error_Label:
4322 push_exception_label_stack (&gnu_program_error_label_stack,
4323 Exception_Label (gnat_node));
4326 case N_Pop_Constraint_Error_Label:
4327 gnu_constraint_error_label_stack
4328 = TREE_CHAIN (gnu_constraint_error_label_stack);
4331 case N_Pop_Storage_Error_Label:
4332 gnu_storage_error_label_stack
4333 = TREE_CHAIN (gnu_storage_error_label_stack);
4336 case N_Pop_Program_Error_Label:
4337 gnu_program_error_label_stack
4338 = TREE_CHAIN (gnu_program_error_label_stack);
4341 /*******************************/
4342 /* Chapter 12: Generic Units: */
4343 /*******************************/
4345 case N_Generic_Function_Renaming_Declaration:
4346 case N_Generic_Package_Renaming_Declaration:
4347 case N_Generic_Procedure_Renaming_Declaration:
4348 case N_Generic_Package_Declaration:
4349 case N_Generic_Subprogram_Declaration:
4350 case N_Package_Instantiation:
4351 case N_Procedure_Instantiation:
4352 case N_Function_Instantiation:
4353 /* These nodes can appear on a declaration list but there is nothing to
4354 to be done with them. */
4355 gnu_result = alloc_stmt_list ();
4358 /***************************************************/
4359 /* Chapter 13: Representation Clauses and */
4360 /* Implementation-Dependent Features: */
4361 /***************************************************/
4363 case N_Attribute_Definition_Clause:
4365 gnu_result = alloc_stmt_list ();
4367 /* The only one we need deal with is for 'Address. For the others, SEM
4368 puts the information elsewhere. We need only deal with 'Address
4369 if the object has a Freeze_Node (which it never will currently). */
4370 if (Get_Attribute_Id (Chars (gnat_node)) != Attr_Address
4371 || No (Freeze_Node (Entity (Name (gnat_node)))))
4374 /* Get the value to use as the address and save it as the
4375 equivalent for GNAT_TEMP. When the object is frozen,
4376 gnat_to_gnu_entity will do the right thing. We have to handle
4377 subprograms differently here. */
4378 if (Ekind (Entity (Name (gnat_node))) == E_Procedure
4379 || Ekind (Entity (Name (gnat_node))) == E_Function)
4380 TREE_VALUE (get_gnu_tree (Entity (Name (gnat_node))))
4381 = gnat_to_gnu (Expression (gnat_node));
4383 save_gnu_tree (Entity (Name (gnat_node)),
4384 gnat_to_gnu (Expression (gnat_node)), true);
4387 case N_Enumeration_Representation_Clause:
4388 case N_Record_Representation_Clause:
4390 /* We do nothing with these. SEM puts the information elsewhere. */
4391 gnu_result = alloc_stmt_list ();
4394 case N_Code_Statement:
4395 if (!type_annotate_only)
4397 tree gnu_template = gnat_to_gnu (Asm_Template (gnat_node));
4398 tree gnu_inputs = NULL_TREE, gnu_outputs = NULL_TREE;
4399 tree gnu_clobbers = NULL_TREE, tail;
4400 bool allows_mem, allows_reg, fake;
4401 int ninputs, noutputs, i;
4402 const char **oconstraints;
4403 const char *constraint;
4406 /* First retrieve the 3 operand lists built by the front-end. */
4407 Setup_Asm_Outputs (gnat_node);
4408 while (Present (gnat_temp = Asm_Output_Variable ()))
4410 tree gnu_value = gnat_to_gnu (gnat_temp);
4411 tree gnu_constr = build_tree_list (NULL_TREE, gnat_to_gnu
4412 (Asm_Output_Constraint ()));
4414 gnu_outputs = tree_cons (gnu_constr, gnu_value, gnu_outputs);
4418 Setup_Asm_Inputs (gnat_node);
4419 while (Present (gnat_temp = Asm_Input_Value ()))
4421 tree gnu_value = gnat_to_gnu (gnat_temp);
4422 tree gnu_constr = build_tree_list (NULL_TREE, gnat_to_gnu
4423 (Asm_Input_Constraint ()));
4425 gnu_inputs = tree_cons (gnu_constr, gnu_value, gnu_inputs);
4429 Clobber_Setup (gnat_node);
4430 while ((clobber = Clobber_Get_Next ()))
4432 = tree_cons (NULL_TREE,
4433 build_string (strlen (clobber) + 1, clobber),
4436 /* Then perform some standard checking and processing on the
4437 operands. In particular, mark them addressable if needed. */
4438 gnu_outputs = nreverse (gnu_outputs);
4439 noutputs = list_length (gnu_outputs);
4440 gnu_inputs = nreverse (gnu_inputs);
4441 ninputs = list_length (gnu_inputs);
4443 = (const char **) alloca (noutputs * sizeof (const char *));
4445 for (i = 0, tail = gnu_outputs; tail; ++i, tail = TREE_CHAIN (tail))
4447 tree output = TREE_VALUE (tail);
4449 = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (tail)));
4450 oconstraints[i] = constraint;
4452 if (parse_output_constraint (&constraint, i, ninputs, noutputs,
4453 &allows_mem, &allows_reg, &fake))
4455 /* If the operand is going to end up in memory,
4456 mark it addressable. Note that we don't test
4457 allows_mem like in the input case below; this
4458 is modelled on the C front-end. */
4460 && !gnat_mark_addressable (output))
4461 output = error_mark_node;
4464 output = error_mark_node;
4466 TREE_VALUE (tail) = output;
4469 for (i = 0, tail = gnu_inputs; tail; ++i, tail = TREE_CHAIN (tail))
4471 tree input = TREE_VALUE (tail);
4473 = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (tail)));
4475 if (parse_input_constraint (&constraint, i, ninputs, noutputs,
4477 &allows_mem, &allows_reg))
4479 /* If the operand is going to end up in memory,
4480 mark it addressable. */
4481 if (!allows_reg && allows_mem
4482 && !gnat_mark_addressable (input))
4483 input = error_mark_node;
4486 input = error_mark_node;
4488 TREE_VALUE (tail) = input;
4491 gnu_result = build4 (ASM_EXPR, void_type_node,
4492 gnu_template, gnu_outputs,
4493 gnu_inputs, gnu_clobbers);
4494 ASM_VOLATILE_P (gnu_result) = Is_Asm_Volatile (gnat_node);
4497 gnu_result = alloc_stmt_list ();
4501 /***************************************************/
4503 /***************************************************/
4505 case N_Freeze_Entity:
4506 start_stmt_group ();
4507 process_freeze_entity (gnat_node);
4508 process_decls (Actions (gnat_node), Empty, Empty, true, true);
4509 gnu_result = end_stmt_group ();
4512 case N_Itype_Reference:
4513 if (!present_gnu_tree (Itype (gnat_node)))
4514 process_type (Itype (gnat_node));
4516 gnu_result = alloc_stmt_list ();
4519 case N_Free_Statement:
4520 if (!type_annotate_only)
4522 tree gnu_ptr = gnat_to_gnu (Expression (gnat_node));
4523 tree gnu_ptr_type = TREE_TYPE (gnu_ptr);
4525 tree gnu_actual_obj_type = 0;
4529 /* If this is a thin pointer, we must dereference it to create
4530 a fat pointer, then go back below to a thin pointer. The
4531 reason for this is that we need a fat pointer someplace in
4532 order to properly compute the size. */
4533 if (TYPE_THIN_POINTER_P (TREE_TYPE (gnu_ptr)))
4534 gnu_ptr = build_unary_op (ADDR_EXPR, NULL_TREE,
4535 build_unary_op (INDIRECT_REF, NULL_TREE,
4538 /* If this is an unconstrained array, we know the object must
4539 have been allocated with the template in front of the object.
4540 So pass the template address, but get the total size. Do this
4541 by converting to a thin pointer. */
4542 if (TYPE_FAT_POINTER_P (TREE_TYPE (gnu_ptr)))
4544 = convert (build_pointer_type
4545 (TYPE_OBJECT_RECORD_TYPE
4546 (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (gnu_ptr)))),
4549 gnu_obj_type = TREE_TYPE (TREE_TYPE (gnu_ptr));
4551 if (Present (Actual_Designated_Subtype (gnat_node)))
4554 = gnat_to_gnu_type (Actual_Designated_Subtype (gnat_node));
4556 if (TYPE_FAT_OR_THIN_POINTER_P (gnu_ptr_type))
4558 = build_unc_object_type_from_ptr (gnu_ptr_type,
4559 gnu_actual_obj_type,
4560 get_identifier ("DEALLOC"));
4563 gnu_actual_obj_type = gnu_obj_type;
4565 gnu_obj_size = TYPE_SIZE_UNIT (gnu_actual_obj_type);
4566 align = TYPE_ALIGN (gnu_obj_type);
4568 if (TREE_CODE (gnu_obj_type) == RECORD_TYPE
4569 && TYPE_CONTAINS_TEMPLATE_P (gnu_obj_type))
4571 tree gnu_char_ptr_type = build_pointer_type (char_type_node);
4572 tree gnu_pos = byte_position (TYPE_FIELDS (gnu_obj_type));
4573 tree gnu_byte_offset
4574 = convert (gnu_char_ptr_type,
4575 size_diffop (size_zero_node, gnu_pos));
4577 gnu_ptr = convert (gnu_char_ptr_type, gnu_ptr);
4578 gnu_ptr = build_binary_op (MINUS_EXPR, gnu_char_ptr_type,
4579 gnu_ptr, gnu_byte_offset);
4582 gnu_result = build_call_alloc_dealloc (gnu_ptr, gnu_obj_size, align,
4583 Procedure_To_Call (gnat_node),
4584 Storage_Pool (gnat_node),
4589 case N_Raise_Constraint_Error:
4590 case N_Raise_Program_Error:
4591 case N_Raise_Storage_Error:
4592 if (type_annotate_only)
4594 gnu_result = alloc_stmt_list ();
4598 gnu_result_type = get_unpadded_type (Etype (gnat_node));
4600 = build_call_raise (UI_To_Int (Reason (gnat_node)), gnat_node,
4603 /* If the type is VOID, this is a statement, so we need to
4604 generate the code for the call. Handle a Condition, if there
4606 if (TREE_CODE (gnu_result_type) == VOID_TYPE)
4608 annotate_with_node (gnu_result, gnat_node);
4610 if (Present (Condition (gnat_node)))
4611 gnu_result = build3 (COND_EXPR, void_type_node,
4612 gnat_to_gnu (Condition (gnat_node)),
4613 gnu_result, alloc_stmt_list ());
4616 gnu_result = build1 (NULL_EXPR, gnu_result_type, gnu_result);
4619 case N_Validate_Unchecked_Conversion:
4620 /* If the result is a pointer type, see if we are either converting
4621 from a non-pointer or from a pointer to a type with a different
4622 alias set and warn if so. If the result defined in the same unit as
4623 this unchecked conversion, we can allow this because we can know to
4624 make that type have alias set 0. */
4626 tree gnu_source_type = gnat_to_gnu_type (Source_Type (gnat_node));
4627 tree gnu_target_type = gnat_to_gnu_type (Target_Type (gnat_node));
4629 if (POINTER_TYPE_P (gnu_target_type)
4630 && !In_Same_Source_Unit (Target_Type (gnat_node), gnat_node)
4631 && get_alias_set (TREE_TYPE (gnu_target_type)) != 0
4632 && !No_Strict_Aliasing (Underlying_Type (Target_Type (gnat_node)))
4633 && (!POINTER_TYPE_P (gnu_source_type)
4634 || (get_alias_set (TREE_TYPE (gnu_source_type))
4635 != get_alias_set (TREE_TYPE (gnu_target_type)))))
4638 ("?possible aliasing problem for type&",
4639 gnat_node, Target_Type (gnat_node));
4641 ("\\?use -fno-strict-aliasing switch for references",
4644 ("\\?or use `pragma No_Strict_Aliasing (&);`",
4645 gnat_node, Target_Type (gnat_node));
4648 /* The No_Strict_Aliasing flag is not propagated to the back-end for
4649 fat pointers so unconditionally warn in problematic cases. */
4650 else if (TYPE_FAT_POINTER_P (gnu_target_type))
4653 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (gnu_target_type)));
4655 if (get_alias_set (array_type) != 0
4656 && (!TYPE_FAT_POINTER_P (gnu_source_type)
4657 || (get_alias_set (TREE_TYPE (TREE_TYPE (TYPE_FIELDS (gnu_source_type))))
4658 != get_alias_set (array_type))))
4661 ("?possible aliasing problem for type&",
4662 gnat_node, Target_Type (gnat_node));
4664 ("\\?use -fno-strict-aliasing switch for references",
4669 gnu_result = alloc_stmt_list ();
4672 case N_Raise_Statement:
4673 case N_Function_Specification:
4674 case N_Procedure_Specification:
4676 case N_Component_Association:
4679 gcc_assert (type_annotate_only);
4680 gnu_result = alloc_stmt_list ();
4683 /* If we pushed our level as part of processing the elaboration routine,
4685 if (went_into_elab_proc)
4687 add_stmt (gnu_result);
4689 gnu_result = end_stmt_group ();
4690 current_function_decl = NULL_TREE;
4693 /* Set the location information on the result if it is a real expression.
4694 References can be reused for multiple GNAT nodes and they would get
4695 the location information of their last use. Note that we may have
4696 no result if we tried to build a CALL_EXPR node to a procedure with
4697 no side-effects and optimization is enabled. */
4698 if (gnu_result && EXPR_P (gnu_result) && !REFERENCE_CLASS_P (gnu_result))
4699 annotate_with_node (gnu_result, gnat_node);
4701 /* If we're supposed to return something of void_type, it means we have
4702 something we're elaborating for effect, so just return. */
4703 if (TREE_CODE (gnu_result_type) == VOID_TYPE)
4706 /* If the result is a constant that overflows, raise constraint error. */
4707 else if (TREE_CODE (gnu_result) == INTEGER_CST
4708 && TREE_OVERFLOW (gnu_result))
4710 post_error ("Constraint_Error will be raised at run-time?", gnat_node);
4713 = build1 (NULL_EXPR, gnu_result_type,
4714 build_call_raise (CE_Overflow_Check_Failed, gnat_node,
4715 N_Raise_Constraint_Error));
4718 /* If our result has side-effects and is of an unconstrained type,
4719 make a SAVE_EXPR so that we can be sure it will only be referenced
4720 once. Note we must do this before any conversions. */
4721 if (TREE_SIDE_EFFECTS (gnu_result)
4722 && (TREE_CODE (gnu_result_type) == UNCONSTRAINED_ARRAY_TYPE
4723 || CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_result_type))))
4724 gnu_result = gnat_stabilize_reference (gnu_result, false);
4726 /* Now convert the result to the proper type. If the type is void or if
4727 we have no result, return error_mark_node to show we have no result.
4728 If the type of the result is correct or if we have a label (which doesn't
4729 have any well-defined type), return our result. Also don't do the
4730 conversion if the "desired" type involves a PLACEHOLDER_EXPR in its size
4731 since those are the cases where the front end may have the type wrong due
4732 to "instantiating" the unconstrained record with discriminant values
4733 or if this is a FIELD_DECL. If this is the Name of an assignment
4734 statement or a parameter of a procedure call, return what we have since
4735 the RHS has to be converted to our type there in that case, unless
4736 GNU_RESULT_TYPE has a simpler size. Similarly, if the two types are
4737 record types with the same name, the expression type has integral mode,
4738 and GNU_RESULT_TYPE BLKmode, don't convert. This will be the case when
4739 we are converting from a packable type to its actual type and we need
4740 those conversions to be NOPs in order for assignments into these types to
4741 work properly if the inner object is a bitfield and hence can't have
4742 its address taken. Finally, don't convert integral types that are the
4743 operand of an unchecked conversion since we need to ignore those
4744 conversions (for 'Valid). Otherwise, convert the result to the proper
4747 if (Present (Parent (gnat_node))
4748 && ((Nkind (Parent (gnat_node)) == N_Assignment_Statement
4749 && Name (Parent (gnat_node)) == gnat_node)
4750 || (Nkind (Parent (gnat_node)) == N_Procedure_Call_Statement
4751 && Name (Parent (gnat_node)) != gnat_node)
4752 || (Nkind (Parent (gnat_node)) == N_Unchecked_Type_Conversion
4753 && !AGGREGATE_TYPE_P (gnu_result_type)
4754 && !AGGREGATE_TYPE_P (TREE_TYPE (gnu_result)))
4755 || Nkind (Parent (gnat_node)) == N_Parameter_Association)
4756 && !(TYPE_SIZE (gnu_result_type)
4757 && TYPE_SIZE (TREE_TYPE (gnu_result))
4758 && (AGGREGATE_TYPE_P (gnu_result_type)
4759 == AGGREGATE_TYPE_P (TREE_TYPE (gnu_result)))
4760 && ((TREE_CODE (TYPE_SIZE (gnu_result_type)) == INTEGER_CST
4761 && (TREE_CODE (TYPE_SIZE (TREE_TYPE (gnu_result)))
4763 || (TREE_CODE (TYPE_SIZE (gnu_result_type)) != INTEGER_CST
4764 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_result_type))
4765 && (CONTAINS_PLACEHOLDER_P
4766 (TYPE_SIZE (TREE_TYPE (gnu_result))))))
4767 && !(TREE_CODE (gnu_result_type) == RECORD_TYPE
4768 && TYPE_JUSTIFIED_MODULAR_P (gnu_result_type))))
4770 /* In this case remove padding only if the inner object is of
4771 self-referential size: in that case it must be an object of
4772 unconstrained type with a default discriminant. In other cases,
4773 we want to avoid copying too much data. */
4774 if (TREE_CODE (TREE_TYPE (gnu_result)) == RECORD_TYPE
4775 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_result))
4776 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE
4777 (TREE_TYPE (TYPE_FIELDS
4778 (TREE_TYPE (gnu_result))))))
4779 gnu_result = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_result))),
4783 else if (TREE_CODE (gnu_result) == LABEL_DECL
4784 || TREE_CODE (gnu_result) == FIELD_DECL
4785 || TREE_CODE (gnu_result) == ERROR_MARK
4786 || (TYPE_SIZE (gnu_result_type)
4787 && TREE_CODE (TYPE_SIZE (gnu_result_type)) != INTEGER_CST
4788 && TREE_CODE (gnu_result) != INDIRECT_REF
4789 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_result_type)))
4790 || ((TYPE_NAME (gnu_result_type)
4791 == TYPE_NAME (TREE_TYPE (gnu_result)))
4792 && TREE_CODE (gnu_result_type) == RECORD_TYPE
4793 && TREE_CODE (TREE_TYPE (gnu_result)) == RECORD_TYPE
4794 && TYPE_MODE (gnu_result_type) == BLKmode
4795 && (GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (gnu_result)))
4798 /* Remove any padding record, but do nothing more in this case. */
4799 if (TREE_CODE (TREE_TYPE (gnu_result)) == RECORD_TYPE
4800 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_result)))
4801 gnu_result = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_result))),
4805 else if (gnu_result == error_mark_node
4806 || gnu_result_type == void_type_node)
4807 gnu_result = error_mark_node;
4808 else if (gnu_result_type != TREE_TYPE (gnu_result))
4809 gnu_result = convert (gnu_result_type, gnu_result);
4811 /* We don't need any NOP_EXPR or NON_LVALUE_EXPR on GNU_RESULT. */
4812 while ((TREE_CODE (gnu_result) == NOP_EXPR
4813 || TREE_CODE (gnu_result) == NON_LVALUE_EXPR)
4814 && TREE_TYPE (TREE_OPERAND (gnu_result, 0)) == TREE_TYPE (gnu_result))
4815 gnu_result = TREE_OPERAND (gnu_result, 0);
4820 /* Subroutine of above to push the exception label stack. GNU_STACK is
4821 a pointer to the stack to update and GNAT_LABEL, if present, is the
4822 label to push onto the stack. */
4825 push_exception_label_stack (tree *gnu_stack, Entity_Id gnat_label)
4827 tree gnu_label = (Present (gnat_label)
4828 ? gnat_to_gnu_entity (gnat_label, NULL_TREE, 0)
4831 *gnu_stack = tree_cons (NULL_TREE, gnu_label, *gnu_stack);
4834 /* Record the current code position in GNAT_NODE. */
4837 record_code_position (Node_Id gnat_node)
4839 tree stmt_stmt = build1 (STMT_STMT, void_type_node, NULL_TREE);
4841 add_stmt_with_node (stmt_stmt, gnat_node);
4842 save_gnu_tree (gnat_node, stmt_stmt, true);
4845 /* Insert the code for GNAT_NODE at the position saved for that node. */
4848 insert_code_for (Node_Id gnat_node)
4850 STMT_STMT_STMT (get_gnu_tree (gnat_node)) = gnat_to_gnu (gnat_node);
4851 save_gnu_tree (gnat_node, NULL_TREE, true);
4854 /* Start a new statement group chained to the previous group. */
4857 start_stmt_group (void)
4859 struct stmt_group *group = stmt_group_free_list;
4861 /* First see if we can get one from the free list. */
4863 stmt_group_free_list = group->previous;
4865 group = (struct stmt_group *) ggc_alloc (sizeof (struct stmt_group));
4867 group->previous = current_stmt_group;
4868 group->stmt_list = group->block = group->cleanups = NULL_TREE;
4869 current_stmt_group = group;
4872 /* Add GNU_STMT to the current statement group. */
4875 add_stmt (tree gnu_stmt)
4877 append_to_statement_list (gnu_stmt, ¤t_stmt_group->stmt_list);
4880 /* Similar, but set the location of GNU_STMT to that of GNAT_NODE. */
4883 add_stmt_with_node (tree gnu_stmt, Node_Id gnat_node)
4885 if (Present (gnat_node))
4886 annotate_with_node (gnu_stmt, gnat_node);
4887 add_stmt (gnu_stmt);
4890 /* Add a declaration statement for GNU_DECL to the current statement group.
4891 Get SLOC from Entity_Id. */
4894 add_decl_expr (tree gnu_decl, Entity_Id gnat_entity)
4896 tree type = TREE_TYPE (gnu_decl);
4897 tree gnu_stmt, gnu_init, gnu_lhs;
4899 /* If this is a variable that Gigi is to ignore, we may have been given
4900 an ERROR_MARK. So test for it. We also might have been given a
4901 reference for a renaming. So only do something for a decl. Also
4902 ignore a TYPE_DECL for an UNCONSTRAINED_ARRAY_TYPE. */
4903 if (!DECL_P (gnu_decl)
4904 || (TREE_CODE (gnu_decl) == TYPE_DECL
4905 && TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE))
4908 gnu_stmt = build1 (DECL_EXPR, void_type_node, gnu_decl);
4910 /* If we are global, we don't want to actually output the DECL_EXPR for
4911 this decl since we already have evaluated the expressions in the
4912 sizes and positions as globals and doing it again would be wrong. */
4913 if (global_bindings_p ())
4915 /* Mark everything as used to prevent node sharing with subprograms.
4916 Note that walk_tree knows how to handle TYPE_DECL, but neither
4917 VAR_DECL nor CONST_DECL. This appears to be somewhat arbitrary. */
4918 walk_tree (&gnu_stmt, mark_visited, NULL, NULL);
4919 if (TREE_CODE (gnu_decl) == VAR_DECL
4920 || TREE_CODE (gnu_decl) == CONST_DECL)
4922 walk_tree (&DECL_SIZE (gnu_decl), mark_visited, NULL, NULL);
4923 walk_tree (&DECL_SIZE_UNIT (gnu_decl), mark_visited, NULL, NULL);
4924 walk_tree (&DECL_INITIAL (gnu_decl), mark_visited, NULL, NULL);
4928 add_stmt_with_node (gnu_stmt, gnat_entity);
4930 /* If this is a variable and an initializer is attached to it, it must be
4931 valid for the context. Similar to init_const in create_var_decl_1. */
4932 if (TREE_CODE (gnu_decl) == VAR_DECL
4933 && (gnu_init = DECL_INITIAL (gnu_decl)) != NULL_TREE
4934 && (TYPE_MAIN_VARIANT (type) != TYPE_MAIN_VARIANT (TREE_TYPE (gnu_init))
4935 || (TREE_STATIC (gnu_decl)
4936 && !initializer_constant_valid_p (gnu_init,
4937 TREE_TYPE (gnu_init)))))
4939 /* If GNU_DECL has a padded type, convert it to the unpadded
4940 type so the assignment is done properly. */
4941 if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
4942 gnu_lhs = convert (TREE_TYPE (TYPE_FIELDS (type)), gnu_decl);
4946 gnu_stmt = build_binary_op (MODIFY_EXPR, NULL_TREE, gnu_lhs, gnu_init);
4948 DECL_INITIAL (gnu_decl) = NULL_TREE;
4949 if (TREE_READONLY (gnu_decl))
4951 TREE_READONLY (gnu_decl) = 0;
4952 DECL_READONLY_ONCE_ELAB (gnu_decl) = 1;
4955 add_stmt_with_node (gnu_stmt, gnat_entity);
4959 /* Utility function to mark nodes with TREE_VISITED and types as having their
4960 sized gimplified. Called from walk_tree. We use this to indicate all
4961 variable sizes and positions in global types may not be shared by any
4965 mark_visited (tree *tp, int *walk_subtrees, void *data ATTRIBUTE_UNUSED)
4967 if (TREE_VISITED (*tp))
4970 /* Don't mark a dummy type as visited because we want to mark its sizes
4971 and fields once it's filled in. */
4972 else if (!TYPE_IS_DUMMY_P (*tp))
4973 TREE_VISITED (*tp) = 1;
4976 TYPE_SIZES_GIMPLIFIED (*tp) = 1;
4981 /* Utility function to unshare expressions wrapped up in a SAVE_EXPR. */
4984 unshare_save_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
4985 void *data ATTRIBUTE_UNUSED)
4989 if (TREE_CODE (t) == SAVE_EXPR)
4990 TREE_OPERAND (t, 0) = unshare_expr (TREE_OPERAND (t, 0));
4995 /* Add GNU_CLEANUP, a cleanup action, to the current code group and
4996 set its location to that of GNAT_NODE if present. */
4999 add_cleanup (tree gnu_cleanup, Node_Id gnat_node)
5001 if (Present (gnat_node))
5002 annotate_with_node (gnu_cleanup, gnat_node);
5003 append_to_statement_list (gnu_cleanup, ¤t_stmt_group->cleanups);
5006 /* Set the BLOCK node corresponding to the current code group to GNU_BLOCK. */
5009 set_block_for_group (tree gnu_block)
5011 gcc_assert (!current_stmt_group->block);
5012 current_stmt_group->block = gnu_block;
5015 /* Return code corresponding to the current code group. It is normally
5016 a STATEMENT_LIST, but may also be a BIND_EXPR or TRY_FINALLY_EXPR if
5017 BLOCK or cleanups were set. */
5020 end_stmt_group (void)
5022 struct stmt_group *group = current_stmt_group;
5023 tree gnu_retval = group->stmt_list;
5025 /* If this is a null list, allocate a new STATEMENT_LIST. Then, if there
5026 are cleanups, make a TRY_FINALLY_EXPR. Last, if there is a BLOCK,
5027 make a BIND_EXPR. Note that we nest in that because the cleanup may
5028 reference variables in the block. */
5029 if (gnu_retval == NULL_TREE)
5030 gnu_retval = alloc_stmt_list ();
5032 if (group->cleanups)
5033 gnu_retval = build2 (TRY_FINALLY_EXPR, void_type_node, gnu_retval,
5036 if (current_stmt_group->block)
5037 gnu_retval = build3 (BIND_EXPR, void_type_node, BLOCK_VARS (group->block),
5038 gnu_retval, group->block);
5040 /* Remove this group from the stack and add it to the free list. */
5041 current_stmt_group = group->previous;
5042 group->previous = stmt_group_free_list;
5043 stmt_group_free_list = group;
5048 /* Add a list of statements from GNAT_LIST, a possibly-empty list of
5052 add_stmt_list (List_Id gnat_list)
5056 if (Present (gnat_list))
5057 for (gnat_node = First (gnat_list); Present (gnat_node);
5058 gnat_node = Next (gnat_node))
5059 add_stmt (gnat_to_gnu (gnat_node));
5062 /* Build a tree from GNAT_LIST, a possibly-empty list of statements.
5063 If BINDING_P is true, push and pop a binding level around the list. */
5066 build_stmt_group (List_Id gnat_list, bool binding_p)
5068 start_stmt_group ();
5072 add_stmt_list (gnat_list);
5076 return end_stmt_group ();
5079 /* Push and pop routines for stacks. We keep a free list around so we
5080 don't waste tree nodes. */
5083 push_stack (tree *gnu_stack_ptr, tree gnu_purpose, tree gnu_value)
5085 tree gnu_node = gnu_stack_free_list;
5089 gnu_stack_free_list = TREE_CHAIN (gnu_node);
5090 TREE_CHAIN (gnu_node) = *gnu_stack_ptr;
5091 TREE_PURPOSE (gnu_node) = gnu_purpose;
5092 TREE_VALUE (gnu_node) = gnu_value;
5095 gnu_node = tree_cons (gnu_purpose, gnu_value, *gnu_stack_ptr);
5097 *gnu_stack_ptr = gnu_node;
5101 pop_stack (tree *gnu_stack_ptr)
5103 tree gnu_node = *gnu_stack_ptr;
5105 *gnu_stack_ptr = TREE_CHAIN (gnu_node);
5106 TREE_CHAIN (gnu_node) = gnu_stack_free_list;
5107 gnu_stack_free_list = gnu_node;
5110 /* Generate GIMPLE in place for the expression at *EXPR_P. */
5113 gnat_gimplify_expr (tree *expr_p, tree *pre_p, tree *post_p ATTRIBUTE_UNUSED)
5115 tree expr = *expr_p;
5118 if (IS_ADA_STMT (expr))
5119 return gnat_gimplify_stmt (expr_p);
5121 switch (TREE_CODE (expr))
5124 /* If this is for a scalar, just make a VAR_DECL for it. If for
5125 an aggregate, get a null pointer of the appropriate type and
5127 if (AGGREGATE_TYPE_P (TREE_TYPE (expr)))
5128 *expr_p = build1 (INDIRECT_REF, TREE_TYPE (expr),
5129 convert (build_pointer_type (TREE_TYPE (expr)),
5130 integer_zero_node));
5133 *expr_p = create_tmp_var (TREE_TYPE (expr), NULL);
5134 TREE_NO_WARNING (*expr_p) = 1;
5137 gimplify_and_add (TREE_OPERAND (expr, 0), pre_p);
5140 case UNCONSTRAINED_ARRAY_REF:
5141 /* We should only do this if we are just elaborating for side-effects,
5142 but we can't know that yet. */
5143 *expr_p = TREE_OPERAND (*expr_p, 0);
5147 op = TREE_OPERAND (expr, 0);
5149 /* If we're taking the address of a constant CONSTRUCTOR, force it to
5150 be put into static memory. We know it's going to be readonly given
5151 the semantics we have and it's required to be static memory in
5152 the case when the reference is in an elaboration procedure. */
5153 if (TREE_CODE (op) == CONSTRUCTOR && TREE_CONSTANT (op))
5155 tree new_var = create_tmp_var (TREE_TYPE (op), "C");
5157 TREE_READONLY (new_var) = 1;
5158 TREE_STATIC (new_var) = 1;
5159 TREE_ADDRESSABLE (new_var) = 1;
5160 DECL_INITIAL (new_var) = op;
5162 TREE_OPERAND (expr, 0) = new_var;
5163 recompute_tree_invariant_for_addr_expr (expr);
5167 /* If we are taking the address of a SAVE_EXPR, we are typically
5168 processing a misaligned argument to be passed by reference in a
5169 procedure call. We just mark the operand as addressable + not
5170 readonly here and let the common gimplifier code perform the
5171 temporary creation, initialization, and "instantiation" in place of
5172 the SAVE_EXPR in further operands, in particular in the copy back
5173 code inserted after the call. */
5174 else if (TREE_CODE (op) == SAVE_EXPR)
5176 TREE_ADDRESSABLE (op) = 1;
5177 TREE_READONLY (op) = 0;
5180 /* Otherwise, if we are taking the address of something that is neither
5181 reference, declaration, or constant, make a variable for the operand
5182 here and then take its address. If we don't do it this way, we may
5183 confuse the gimplifier because it needs to know the variable is
5184 addressable at this point. This duplicates code in
5185 internal_get_tmp_var, which is unfortunate. */
5186 else if (TREE_CODE_CLASS (TREE_CODE (op)) != tcc_reference
5187 && TREE_CODE_CLASS (TREE_CODE (op)) != tcc_declaration
5188 && TREE_CODE_CLASS (TREE_CODE (op)) != tcc_constant)
5190 tree new_var = create_tmp_var (TREE_TYPE (op), "A");
5191 tree mod = build2 (GIMPLE_MODIFY_STMT, TREE_TYPE (op), new_var, op);
5193 TREE_ADDRESSABLE (new_var) = 1;
5195 if (EXPR_HAS_LOCATION (op))
5196 SET_EXPR_LOCUS (mod, EXPR_LOCUS (op));
5198 gimplify_and_add (mod, pre_p);
5199 TREE_OPERAND (expr, 0) = new_var;
5200 recompute_tree_invariant_for_addr_expr (expr);
5204 return GS_UNHANDLED;
5207 /* We have a kludge here. If the FIELD_DECL is from a fat pointer and is
5208 from an early dummy type, replace it with the proper FIELD_DECL. */
5209 if (TYPE_FAT_POINTER_P (TREE_TYPE (TREE_OPERAND (*expr_p, 0)))
5210 && DECL_ORIGINAL_FIELD (TREE_OPERAND (*expr_p, 1)))
5212 TREE_OPERAND (*expr_p, 1)
5213 = DECL_ORIGINAL_FIELD (TREE_OPERAND (*expr_p, 1));
5217 /* ... fall through ... */
5220 return GS_UNHANDLED;
5224 /* Generate GIMPLE in place for the statement at *STMT_P. */
5226 static enum gimplify_status
5227 gnat_gimplify_stmt (tree *stmt_p)
5229 tree stmt = *stmt_p;
5231 switch (TREE_CODE (stmt))
5234 *stmt_p = STMT_STMT_STMT (stmt);
5239 tree gnu_start_label = create_artificial_label ();
5240 tree gnu_end_label = LOOP_STMT_LABEL (stmt);
5242 /* Set to emit the statements of the loop. */
5243 *stmt_p = NULL_TREE;
5245 /* We first emit the start label and then a conditional jump to
5246 the end label if there's a top condition, then the body of the
5247 loop, then a conditional branch to the end label, then the update,
5248 if any, and finally a jump to the start label and the definition
5249 of the end label. */
5250 append_to_statement_list (build1 (LABEL_EXPR, void_type_node,
5254 if (LOOP_STMT_TOP_COND (stmt))
5255 append_to_statement_list (build3 (COND_EXPR, void_type_node,
5256 LOOP_STMT_TOP_COND (stmt),
5263 append_to_statement_list (LOOP_STMT_BODY (stmt), stmt_p);
5265 if (LOOP_STMT_BOT_COND (stmt))
5266 append_to_statement_list (build3 (COND_EXPR, void_type_node,
5267 LOOP_STMT_BOT_COND (stmt),
5274 if (LOOP_STMT_UPDATE (stmt))
5275 append_to_statement_list (LOOP_STMT_UPDATE (stmt), stmt_p);
5277 append_to_statement_list (build1 (GOTO_EXPR, void_type_node,
5280 append_to_statement_list (build1 (LABEL_EXPR, void_type_node,
5287 /* Build a statement to jump to the corresponding end label, then
5288 see if it needs to be conditional. */
5289 *stmt_p = build1 (GOTO_EXPR, void_type_node, EXIT_STMT_LABEL (stmt));
5290 if (EXIT_STMT_COND (stmt))
5291 *stmt_p = build3 (COND_EXPR, void_type_node,
5292 EXIT_STMT_COND (stmt), *stmt_p, alloc_stmt_list ());
5300 /* Force references to each of the entities in packages withed by GNAT_NODE.
5301 Operate recursively but check that we aren't elaborating something more
5304 This routine is exclusively called in type_annotate mode, to compute DDA
5305 information for types in withed units, for ASIS use. */
5308 elaborate_all_entities (Node_Id gnat_node)
5310 Entity_Id gnat_with_clause, gnat_entity;
5312 /* Process each unit only once. As we trace the context of all relevant
5313 units transitively, including generic bodies, we may encounter the
5314 same generic unit repeatedly. */
5315 if (!present_gnu_tree (gnat_node))
5316 save_gnu_tree (gnat_node, integer_zero_node, true);
5318 /* Save entities in all context units. A body may have an implicit_with
5319 on its own spec, if the context includes a child unit, so don't save
5321 for (gnat_with_clause = First (Context_Items (gnat_node));
5322 Present (gnat_with_clause);
5323 gnat_with_clause = Next (gnat_with_clause))
5324 if (Nkind (gnat_with_clause) == N_With_Clause
5325 && !present_gnu_tree (Library_Unit (gnat_with_clause))
5326 && Library_Unit (gnat_with_clause) != Library_Unit (Cunit (Main_Unit)))
5328 elaborate_all_entities (Library_Unit (gnat_with_clause));
5330 if (Ekind (Entity (Name (gnat_with_clause))) == E_Package)
5332 for (gnat_entity = First_Entity (Entity (Name (gnat_with_clause)));
5333 Present (gnat_entity);
5334 gnat_entity = Next_Entity (gnat_entity))
5335 if (Is_Public (gnat_entity)
5336 && Convention (gnat_entity) != Convention_Intrinsic
5337 && Ekind (gnat_entity) != E_Package
5338 && Ekind (gnat_entity) != E_Package_Body
5339 && Ekind (gnat_entity) != E_Operator
5340 && !(IN (Ekind (gnat_entity), Type_Kind)
5341 && !Is_Frozen (gnat_entity))
5342 && !((Ekind (gnat_entity) == E_Procedure
5343 || Ekind (gnat_entity) == E_Function)
5344 && Is_Intrinsic_Subprogram (gnat_entity))
5345 && !IN (Ekind (gnat_entity), Named_Kind)
5346 && !IN (Ekind (gnat_entity), Generic_Unit_Kind))
5347 gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
5349 else if (Ekind (Entity (Name (gnat_with_clause))) == E_Generic_Package)
5352 = Corresponding_Body (Unit (Library_Unit (gnat_with_clause)));
5354 /* Retrieve compilation unit node of generic body. */
5355 while (Present (gnat_body)
5356 && Nkind (gnat_body) != N_Compilation_Unit)
5357 gnat_body = Parent (gnat_body);
5359 /* If body is available, elaborate its context. */
5360 if (Present (gnat_body))
5361 elaborate_all_entities (gnat_body);
5365 if (Nkind (Unit (gnat_node)) == N_Package_Body)
5366 elaborate_all_entities (Library_Unit (gnat_node));
5369 /* Do the processing of N_Freeze_Entity, GNAT_NODE. */
5372 process_freeze_entity (Node_Id gnat_node)
5374 Entity_Id gnat_entity = Entity (gnat_node);
5378 = (Nkind (Declaration_Node (gnat_entity)) == N_Object_Declaration
5379 && present_gnu_tree (Declaration_Node (gnat_entity)))
5380 ? get_gnu_tree (Declaration_Node (gnat_entity)) : NULL_TREE;
5382 /* If this is a package, need to generate code for the package. */
5383 if (Ekind (gnat_entity) == E_Package)
5386 (Parent (Corresponding_Body
5387 (Parent (Declaration_Node (gnat_entity)))));
5391 /* Check for old definition after the above call. This Freeze_Node
5392 might be for one its Itypes. */
5394 = present_gnu_tree (gnat_entity) ? get_gnu_tree (gnat_entity) : 0;
5396 /* If this entity has an Address representation clause, GNU_OLD is the
5397 address, so discard it here. The exception is if this is a subprogram.
5398 In that case, GNU_OLD is a TREE_LIST that contains both an address and
5399 the ADDR_EXPR needed to take the address of the subprogram. */
5400 if (Present (Address_Clause (gnat_entity))
5401 && TREE_CODE (gnu_old) != TREE_LIST)
5404 /* Don't do anything for class-wide types they are always
5405 transformed into their root type. */
5406 if (Ekind (gnat_entity) == E_Class_Wide_Type
5407 || (Ekind (gnat_entity) == E_Class_Wide_Subtype
5408 && Present (Equivalent_Type (gnat_entity))))
5411 /* Don't do anything for subprograms that may have been elaborated before
5412 their freeze nodes. This can happen, for example because of an inner call
5413 in an instance body, or a previous compilation of a spec for inlining
5414 purposes. ??? Does this still occur? */
5416 && ((TREE_CODE (gnu_old) == FUNCTION_DECL
5417 && (Ekind (gnat_entity) == E_Function
5418 || Ekind (gnat_entity) == E_Procedure))
5419 || (TREE_CODE (gnu_old) != TREE_LIST
5420 && TREE_CODE (TREE_TYPE (gnu_old)) == FUNCTION_TYPE
5421 && Ekind (gnat_entity) == E_Subprogram_Type)))
5424 /* If we have a non-dummy type old tree, we have nothing to do, except
5425 aborting if this is the public view of a private type whose full view was
5426 not delayed, as this node was never delayed as it should have been. We
5427 let this happen for concurrent types and their Corresponding_Record_Type,
5428 however, because each might legitimately be elaborated before it's own
5429 freeze node, e.g. while processing the other. */
5431 && !(TREE_CODE (gnu_old) == TYPE_DECL
5432 && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_old)))
5433 && TREE_CODE (gnu_old) != TREE_LIST)
5435 gcc_assert ((IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
5436 && Present (Full_View (gnat_entity))
5437 && No (Freeze_Node (Full_View (gnat_entity))))
5438 || Is_Concurrent_Type (gnat_entity)
5439 || (IN (Ekind (gnat_entity), Record_Kind)
5440 && Is_Concurrent_Record_Type (gnat_entity)));
5444 /* Reset the saved tree, if any, and elaborate the object or type for real.
5445 If there is a full declaration, elaborate it and copy the type to
5446 GNAT_ENTITY. Likewise if this is the record subtype corresponding to
5447 a class wide type or subtype. First handle the subprogram case: there,
5448 we have to set the GNU tree to be the address clause, if any. */
5451 save_gnu_tree (gnat_entity, NULL_TREE, false);
5452 if (TREE_CODE (gnu_old) == TREE_LIST && TREE_VALUE (gnu_old))
5453 save_gnu_tree (gnat_entity, TREE_VALUE (gnu_old), true);
5455 if (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
5456 && Present (Full_View (gnat_entity))
5457 && present_gnu_tree (Full_View (gnat_entity)))
5458 save_gnu_tree (Full_View (gnat_entity), NULL_TREE, false);
5459 if (Present (Class_Wide_Type (gnat_entity))
5460 && Class_Wide_Type (gnat_entity) != gnat_entity)
5461 save_gnu_tree (Class_Wide_Type (gnat_entity), NULL_TREE, false);
5464 if (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
5465 && Present (Full_View (gnat_entity)))
5467 gnu_new = gnat_to_gnu_entity (Full_View (gnat_entity), NULL_TREE, 1);
5469 /* Propagate back-annotations from full view to partial view. */
5470 if (Unknown_Alignment (gnat_entity))
5471 Set_Alignment (gnat_entity, Alignment (Full_View (gnat_entity)));
5473 if (Unknown_Esize (gnat_entity))
5474 Set_Esize (gnat_entity, Esize (Full_View (gnat_entity)));
5476 if (Unknown_RM_Size (gnat_entity))
5477 Set_RM_Size (gnat_entity, RM_Size (Full_View (gnat_entity)));
5479 /* The above call may have defined this entity (the simplest example
5480 of this is when we have a private enumeral type since the bounds
5481 will have the public view. */
5482 if (!present_gnu_tree (gnat_entity))
5483 save_gnu_tree (gnat_entity, gnu_new, false);
5484 if (Present (Class_Wide_Type (gnat_entity))
5485 && Class_Wide_Type (gnat_entity) != gnat_entity)
5486 save_gnu_tree (Class_Wide_Type (gnat_entity), gnu_new, false);
5489 gnu_new = gnat_to_gnu_entity (gnat_entity, gnu_init, 1);
5491 /* If this was a subprogram being frozen, we have to update the ADDR_EXPR
5492 we previously made. Update the operand, then set up to update the
5494 if (gnu_old && TREE_CODE (gnu_old) == TREE_LIST)
5496 TREE_OPERAND (TREE_PURPOSE (gnu_old), 0) = gnu_new;
5497 gnu_old = TREE_TYPE (TREE_PURPOSE (gnu_old));
5500 /* If we've made any pointers to the old version of this type, we
5501 have to update them. */
5503 update_pointer_to (TYPE_MAIN_VARIANT (TREE_TYPE (gnu_old)),
5504 TREE_TYPE (gnu_new));
5507 /* Process the list of inlined subprograms of GNAT_NODE, which is an
5508 N_Compilation_Unit. */
5511 process_inlined_subprograms (Node_Id gnat_node)
5513 Entity_Id gnat_entity;
5516 /* If we can inline, generate RTL for all the inlined subprograms.
5517 Define the entity first so we set DECL_EXTERNAL. */
5518 if (optimize > 0 && !flag_really_no_inline)
5519 for (gnat_entity = First_Inlined_Subprogram (gnat_node);
5520 Present (gnat_entity);
5521 gnat_entity = Next_Inlined_Subprogram (gnat_entity))
5523 gnat_body = Parent (Declaration_Node (gnat_entity));
5525 if (Nkind (gnat_body) != N_Subprogram_Body)
5527 /* ??? This really should always be Present. */
5528 if (No (Corresponding_Body (gnat_body)))
5532 = Parent (Declaration_Node (Corresponding_Body (gnat_body)));
5535 if (Present (gnat_body))
5537 gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
5538 add_stmt (gnat_to_gnu (gnat_body));
5543 /* Elaborate decls in the lists GNAT_DECLS and GNAT_DECLS2, if present.
5544 We make two passes, one to elaborate anything other than bodies (but
5545 we declare a function if there was no spec). The second pass
5546 elaborates the bodies.
5548 GNAT_END_LIST gives the element in the list past the end. Normally,
5549 this is Empty, but can be First_Real_Statement for a
5550 Handled_Sequence_Of_Statements.
5552 We make a complete pass through both lists if PASS1P is true, then make
5553 the second pass over both lists if PASS2P is true. The lists usually
5554 correspond to the public and private parts of a package. */
5557 process_decls (List_Id gnat_decls, List_Id gnat_decls2,
5558 Node_Id gnat_end_list, bool pass1p, bool pass2p)
5560 List_Id gnat_decl_array[2];
5564 gnat_decl_array[0] = gnat_decls, gnat_decl_array[1] = gnat_decls2;
5567 for (i = 0; i <= 1; i++)
5568 if (Present (gnat_decl_array[i]))
5569 for (gnat_decl = First (gnat_decl_array[i]);
5570 gnat_decl != gnat_end_list; gnat_decl = Next (gnat_decl))
5572 /* For package specs, we recurse inside the declarations,
5573 thus taking the two pass approach inside the boundary. */
5574 if (Nkind (gnat_decl) == N_Package_Declaration
5575 && (Nkind (Specification (gnat_decl)
5576 == N_Package_Specification)))
5577 process_decls (Visible_Declarations (Specification (gnat_decl)),
5578 Private_Declarations (Specification (gnat_decl)),
5579 Empty, true, false);
5581 /* Similarly for any declarations in the actions of a
5583 else if (Nkind (gnat_decl) == N_Freeze_Entity)
5585 process_freeze_entity (gnat_decl);
5586 process_decls (Actions (gnat_decl), Empty, Empty, true, false);
5589 /* Package bodies with freeze nodes get their elaboration deferred
5590 until the freeze node, but the code must be placed in the right
5591 place, so record the code position now. */
5592 else if (Nkind (gnat_decl) == N_Package_Body
5593 && Present (Freeze_Node (Corresponding_Spec (gnat_decl))))
5594 record_code_position (gnat_decl);
5596 else if (Nkind (gnat_decl) == N_Package_Body_Stub
5597 && Present (Library_Unit (gnat_decl))
5598 && Present (Freeze_Node
5601 (Library_Unit (gnat_decl)))))))
5602 record_code_position
5603 (Proper_Body (Unit (Library_Unit (gnat_decl))));
5605 /* We defer most subprogram bodies to the second pass. */
5606 else if (Nkind (gnat_decl) == N_Subprogram_Body)
5608 if (Acts_As_Spec (gnat_decl))
5610 Node_Id gnat_subprog_id = Defining_Entity (gnat_decl);
5612 if (Ekind (gnat_subprog_id) != E_Generic_Procedure
5613 && Ekind (gnat_subprog_id) != E_Generic_Function)
5614 gnat_to_gnu_entity (gnat_subprog_id, NULL_TREE, 1);
5617 /* For bodies and stubs that act as their own specs, the entity
5618 itself must be elaborated in the first pass, because it may
5619 be used in other declarations. */
5620 else if (Nkind (gnat_decl) == N_Subprogram_Body_Stub)
5622 Node_Id gnat_subprog_id =
5623 Defining_Entity (Specification (gnat_decl));
5625 if (Ekind (gnat_subprog_id) != E_Subprogram_Body
5626 && Ekind (gnat_subprog_id) != E_Generic_Procedure
5627 && Ekind (gnat_subprog_id) != E_Generic_Function)
5628 gnat_to_gnu_entity (gnat_subprog_id, NULL_TREE, 1);
5631 /* Concurrent stubs stand for the corresponding subprogram bodies,
5632 which are deferred like other bodies. */
5633 else if (Nkind (gnat_decl) == N_Task_Body_Stub
5634 || Nkind (gnat_decl) == N_Protected_Body_Stub)
5637 add_stmt (gnat_to_gnu (gnat_decl));
5640 /* Here we elaborate everything we deferred above except for package bodies,
5641 which are elaborated at their freeze nodes. Note that we must also
5642 go inside things (package specs and freeze nodes) the first pass did. */
5644 for (i = 0; i <= 1; i++)
5645 if (Present (gnat_decl_array[i]))
5646 for (gnat_decl = First (gnat_decl_array[i]);
5647 gnat_decl != gnat_end_list; gnat_decl = Next (gnat_decl))
5649 if (Nkind (gnat_decl) == N_Subprogram_Body
5650 || Nkind (gnat_decl) == N_Subprogram_Body_Stub
5651 || Nkind (gnat_decl) == N_Task_Body_Stub
5652 || Nkind (gnat_decl) == N_Protected_Body_Stub)
5653 add_stmt (gnat_to_gnu (gnat_decl));
5655 else if (Nkind (gnat_decl) == N_Package_Declaration
5656 && (Nkind (Specification (gnat_decl)
5657 == N_Package_Specification)))
5658 process_decls (Visible_Declarations (Specification (gnat_decl)),
5659 Private_Declarations (Specification (gnat_decl)),
5660 Empty, false, true);
5662 else if (Nkind (gnat_decl) == N_Freeze_Entity)
5663 process_decls (Actions (gnat_decl), Empty, Empty, false, true);
5667 /* Emit code for a range check. GNU_EXPR is the expression to be checked,
5668 GNAT_RANGE_TYPE the gnat type or subtype containing the bounds against
5669 which we have to check. */
5672 emit_range_check (tree gnu_expr, Entity_Id gnat_range_type)
5674 tree gnu_range_type = get_unpadded_type (gnat_range_type);
5675 tree gnu_low = TYPE_MIN_VALUE (gnu_range_type);
5676 tree gnu_high = TYPE_MAX_VALUE (gnu_range_type);
5677 tree gnu_compare_type = get_base_type (TREE_TYPE (gnu_expr));
5679 /* If GNU_EXPR has an integral type that is narrower than GNU_RANGE_TYPE,
5680 we can't do anything since we might be truncating the bounds. No
5681 check is needed in this case. */
5682 if (INTEGRAL_TYPE_P (TREE_TYPE (gnu_expr))
5683 && (TYPE_PRECISION (gnu_compare_type)
5684 < TYPE_PRECISION (get_base_type (gnu_range_type))))
5687 /* Checked expressions must be evaluated only once. */
5688 gnu_expr = protect_multiple_eval (gnu_expr);
5690 /* There's no good type to use here, so we might as well use
5691 integer_type_node. Note that the form of the check is
5692 (not (expr >= lo)) or (not (expr <= hi))
5693 the reason for this slightly convoluted form is that NaN's
5694 are not considered to be in range in the float case. */
5696 (build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
5698 (build_binary_op (GE_EXPR, integer_type_node,
5699 convert (gnu_compare_type, gnu_expr),
5700 convert (gnu_compare_type, gnu_low))),
5702 (build_binary_op (LE_EXPR, integer_type_node,
5703 convert (gnu_compare_type, gnu_expr),
5704 convert (gnu_compare_type,
5706 gnu_expr, CE_Range_Check_Failed);
5709 /* Emit code for an index check. GNU_ARRAY_OBJECT is the array object
5710 which we are about to index, GNU_EXPR is the index expression to be
5711 checked, GNU_LOW and GNU_HIGH are the lower and upper bounds
5712 against which GNU_EXPR has to be checked. Note that for index
5713 checking we cannot use the emit_range_check function (although very
5714 similar code needs to be generated in both cases) since for index
5715 checking the array type against which we are checking the indeces
5716 may be unconstrained and consequently we need to retrieve the
5717 actual index bounds from the array object itself
5718 (GNU_ARRAY_OBJECT). The place where we need to do that is in
5719 subprograms having unconstrained array formal parameters */
5722 emit_index_check (tree gnu_array_object,
5727 tree gnu_expr_check;
5729 /* Checked expressions must be evaluated only once. */
5730 gnu_expr = protect_multiple_eval (gnu_expr);
5732 /* Must do this computation in the base type in case the expression's
5733 type is an unsigned subtypes. */
5734 gnu_expr_check = convert (get_base_type (TREE_TYPE (gnu_expr)), gnu_expr);
5736 /* If GNU_LOW or GNU_HIGH are a PLACEHOLDER_EXPR, qualify them by
5737 the object we are handling. */
5738 gnu_low = SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_low, gnu_array_object);
5739 gnu_high = SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_high, gnu_array_object);
5741 /* There's no good type to use here, so we might as well use
5742 integer_type_node. */
5744 (build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
5745 build_binary_op (LT_EXPR, integer_type_node,
5747 convert (TREE_TYPE (gnu_expr_check),
5749 build_binary_op (GT_EXPR, integer_type_node,
5751 convert (TREE_TYPE (gnu_expr_check),
5753 gnu_expr, CE_Index_Check_Failed);
5756 /* GNU_COND contains the condition corresponding to an access, discriminant or
5757 range check of value GNU_EXPR. Build a COND_EXPR that returns GNU_EXPR if
5758 GNU_COND is false and raises a CONSTRAINT_ERROR if GNU_COND is true.
5759 REASON is the code that says why the exception was raised. */
5762 emit_check (tree gnu_cond, tree gnu_expr, int reason)
5767 gnu_call = build_call_raise (reason, Empty, N_Raise_Constraint_Error);
5769 /* Use an outer COMPOUND_EXPR to make sure that GNU_EXPR will get evaluated
5770 in front of the comparison in case it ends up being a SAVE_EXPR. Put the
5771 whole thing inside its own SAVE_EXPR so the inner SAVE_EXPR doesn't leak
5773 gnu_result = fold_build3 (COND_EXPR, TREE_TYPE (gnu_expr), gnu_cond,
5774 build2 (COMPOUND_EXPR, TREE_TYPE (gnu_expr),
5775 gnu_call, gnu_expr),
5778 /* If GNU_EXPR has side effects, make the outer COMPOUND_EXPR and
5779 protect it. Otherwise, show GNU_RESULT has no side effects: we
5780 don't need to evaluate it just for the check. */
5781 if (TREE_SIDE_EFFECTS (gnu_expr))
5783 = build2 (COMPOUND_EXPR, TREE_TYPE (gnu_expr), gnu_expr, gnu_result);
5785 TREE_SIDE_EFFECTS (gnu_result) = 0;
5787 /* ??? Unfortunately, if we don't put a SAVE_EXPR around this whole thing,
5788 we will repeatedly do the test. It would be nice if GCC was able
5789 to optimize this and only do it once. */
5790 return save_expr (gnu_result);
5793 /* Return an expression that converts GNU_EXPR to GNAT_TYPE, doing
5794 overflow checks if OVERFLOW_P is nonzero and range checks if
5795 RANGE_P is nonzero. GNAT_TYPE is known to be an integral type.
5796 If TRUNCATE_P is nonzero, do a float to integer conversion with
5797 truncation; otherwise round. */
5800 convert_with_check (Entity_Id gnat_type, tree gnu_expr, bool overflowp,
5801 bool rangep, bool truncatep)
5803 tree gnu_type = get_unpadded_type (gnat_type);
5804 tree gnu_in_type = TREE_TYPE (gnu_expr);
5805 tree gnu_in_basetype = get_base_type (gnu_in_type);
5806 tree gnu_base_type = get_base_type (gnu_type);
5807 tree gnu_result = gnu_expr;
5809 /* If we are not doing any checks, the output is an integral type, and
5810 the input is not a floating type, just do the conversion. This
5811 shortcut is required to avoid problems with packed array types
5812 and simplifies code in all cases anyway. */
5813 if (!rangep && !overflowp && INTEGRAL_TYPE_P (gnu_base_type)
5814 && !FLOAT_TYPE_P (gnu_in_type))
5815 return convert (gnu_type, gnu_expr);
5817 /* First convert the expression to its base type. This
5818 will never generate code, but makes the tests below much simpler.
5819 But don't do this if converting from an integer type to an unconstrained
5820 array type since then we need to get the bounds from the original
5822 if (TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE)
5823 gnu_result = convert (gnu_in_basetype, gnu_result);
5825 /* If overflow checks are requested, we need to be sure the result will
5826 fit in the output base type. But don't do this if the input
5827 is integer and the output floating-point. */
5829 && !(FLOAT_TYPE_P (gnu_base_type) && INTEGRAL_TYPE_P (gnu_in_basetype)))
5831 /* Ensure GNU_EXPR only gets evaluated once. */
5832 tree gnu_input = protect_multiple_eval (gnu_result);
5833 tree gnu_cond = integer_zero_node;
5834 tree gnu_in_lb = TYPE_MIN_VALUE (gnu_in_basetype);
5835 tree gnu_in_ub = TYPE_MAX_VALUE (gnu_in_basetype);
5836 tree gnu_out_lb = TYPE_MIN_VALUE (gnu_base_type);
5837 tree gnu_out_ub = TYPE_MAX_VALUE (gnu_base_type);
5839 /* Convert the lower bounds to signed types, so we're sure we're
5840 comparing them properly. Likewise, convert the upper bounds
5841 to unsigned types. */
5842 if (INTEGRAL_TYPE_P (gnu_in_basetype) && TYPE_UNSIGNED (gnu_in_basetype))
5843 gnu_in_lb = convert (gnat_signed_type (gnu_in_basetype), gnu_in_lb);
5845 if (INTEGRAL_TYPE_P (gnu_in_basetype)
5846 && !TYPE_UNSIGNED (gnu_in_basetype))
5847 gnu_in_ub = convert (gnat_unsigned_type (gnu_in_basetype), gnu_in_ub);
5849 if (INTEGRAL_TYPE_P (gnu_base_type) && TYPE_UNSIGNED (gnu_base_type))
5850 gnu_out_lb = convert (gnat_signed_type (gnu_base_type), gnu_out_lb);
5852 if (INTEGRAL_TYPE_P (gnu_base_type) && !TYPE_UNSIGNED (gnu_base_type))
5853 gnu_out_ub = convert (gnat_unsigned_type (gnu_base_type), gnu_out_ub);
5855 /* Check each bound separately and only if the result bound
5856 is tighter than the bound on the input type. Note that all the
5857 types are base types, so the bounds must be constant. Also,
5858 the comparison is done in the base type of the input, which
5859 always has the proper signedness. First check for input
5860 integer (which means output integer), output float (which means
5861 both float), or mixed, in which case we always compare.
5862 Note that we have to do the comparison which would *fail* in the
5863 case of an error since if it's an FP comparison and one of the
5864 values is a NaN or Inf, the comparison will fail. */
5865 if (INTEGRAL_TYPE_P (gnu_in_basetype)
5866 ? tree_int_cst_lt (gnu_in_lb, gnu_out_lb)
5867 : (FLOAT_TYPE_P (gnu_base_type)
5868 ? REAL_VALUES_LESS (TREE_REAL_CST (gnu_in_lb),
5869 TREE_REAL_CST (gnu_out_lb))
5873 (build_binary_op (GE_EXPR, integer_type_node,
5874 gnu_input, convert (gnu_in_basetype,
5877 if (INTEGRAL_TYPE_P (gnu_in_basetype)
5878 ? tree_int_cst_lt (gnu_out_ub, gnu_in_ub)
5879 : (FLOAT_TYPE_P (gnu_base_type)
5880 ? REAL_VALUES_LESS (TREE_REAL_CST (gnu_out_ub),
5881 TREE_REAL_CST (gnu_in_lb))
5884 = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node, gnu_cond,
5886 (build_binary_op (LE_EXPR, integer_type_node,
5888 convert (gnu_in_basetype,
5891 if (!integer_zerop (gnu_cond))
5892 gnu_result = emit_check (gnu_cond, gnu_input,
5893 CE_Overflow_Check_Failed);
5896 /* Now convert to the result base type. If this is a non-truncating
5897 float-to-integer conversion, round. */
5898 if (INTEGRAL_TYPE_P (gnu_base_type) && FLOAT_TYPE_P (gnu_in_basetype)
5901 REAL_VALUE_TYPE half_minus_pred_half, pred_half;
5902 tree gnu_conv, gnu_zero, gnu_comp, gnu_saved_result, calc_type;
5903 tree gnu_pred_half, gnu_add_pred_half, gnu_subtract_pred_half;
5904 const struct real_format *fmt;
5906 /* The following calculations depend on proper rounding to even
5907 of each arithmetic operation. In order to prevent excess
5908 precision from spoiling this property, use the widest hardware
5909 floating-point type.
5911 FIXME: For maximum efficiency, this should only be done for machines
5912 and types where intermediates may have extra precision. */
5914 calc_type = longest_float_type_node;
5915 /* FIXME: Should not have padding in the first place */
5916 if (TREE_CODE (calc_type) == RECORD_TYPE
5917 && TYPE_IS_PADDING_P (calc_type))
5918 calc_type = TREE_TYPE (TYPE_FIELDS (calc_type));
5920 /* Compute the exact value calc_type'Pred (0.5) at compile time. */
5921 fmt = REAL_MODE_FORMAT (TYPE_MODE (calc_type));
5922 real_2expN (&half_minus_pred_half, -(fmt->p) - 1);
5923 REAL_ARITHMETIC (pred_half, MINUS_EXPR, dconsthalf,
5924 half_minus_pred_half);
5925 gnu_pred_half = build_real (calc_type, pred_half);
5927 /* If the input is strictly negative, subtract this value
5928 and otherwise add it from the input. For 0.5, the result
5929 is exactly between 1.0 and the machine number preceding 1.0
5930 (for calc_type). Since the last bit of 1.0 is even, this 0.5
5931 will round to 1.0, while all other number with an absolute
5932 value less than 0.5 round to 0.0. For larger numbers exactly
5933 halfway between integers, rounding will always be correct as
5934 the true mathematical result will be closer to the higher
5935 integer compared to the lower one. So, this constant works
5936 for all floating-point numbers.
5938 The reason to use the same constant with subtract/add instead
5939 of a positive and negative constant is to allow the comparison
5940 to be scheduled in parallel with retrieval of the constant and
5941 conversion of the input to the calc_type (if necessary).
5944 gnu_zero = convert (gnu_in_basetype, integer_zero_node);
5945 gnu_saved_result = save_expr (gnu_result);
5946 gnu_conv = convert (calc_type, gnu_saved_result);
5947 gnu_comp = build2 (GE_EXPR, integer_type_node,
5948 gnu_saved_result, gnu_zero);
5950 = build2 (PLUS_EXPR, calc_type, gnu_conv, gnu_pred_half);
5951 gnu_subtract_pred_half
5952 = build2 (MINUS_EXPR, calc_type, gnu_conv, gnu_pred_half);
5953 gnu_result = build3 (COND_EXPR, calc_type, gnu_comp,
5954 gnu_add_pred_half, gnu_subtract_pred_half);
5957 if (TREE_CODE (gnu_base_type) == INTEGER_TYPE
5958 && TYPE_HAS_ACTUAL_BOUNDS_P (gnu_base_type)
5959 && TREE_CODE (gnu_result) == UNCONSTRAINED_ARRAY_REF)
5960 gnu_result = unchecked_convert (gnu_base_type, gnu_result, false);
5962 gnu_result = convert (gnu_base_type, gnu_result);
5964 /* Finally, do the range check if requested. Note that if the
5965 result type is a modular type, the range check is actually
5966 an overflow check. */
5969 || (TREE_CODE (gnu_base_type) == INTEGER_TYPE
5970 && TYPE_MODULAR_P (gnu_base_type) && overflowp))
5971 gnu_result = emit_range_check (gnu_result, gnat_type);
5973 return convert (gnu_type, gnu_result);
5976 /* Return 1 if GNU_EXPR can be directly addressed. This is the case unless
5977 it is an expression involving computation or if it involves a reference
5978 to a bitfield or to a field not sufficiently aligned for its type. */
5981 addressable_p (tree gnu_expr)
5983 switch (TREE_CODE (gnu_expr))
5989 /* All DECLs are addressable: if they are in a register, we can force
5993 case UNCONSTRAINED_ARRAY_REF:
6001 return (!DECL_BIT_FIELD (TREE_OPERAND (gnu_expr, 1))
6002 && (!STRICT_ALIGNMENT
6003 /* Even with DECL_BIT_FIELD cleared, we have to ensure that
6004 the field is sufficiently aligned, in case it is subject
6005 to a pragma Component_Alignment. But we don't need to
6006 check the alignment of the containing record, as it is
6007 guaranteed to be not smaller than that of its most
6008 aligned field that is not a bit-field. */
6009 || DECL_ALIGN (TREE_OPERAND (gnu_expr, 1))
6010 >= TYPE_ALIGN (TREE_TYPE (gnu_expr)))
6011 && addressable_p (TREE_OPERAND (gnu_expr, 0)));
6013 case ARRAY_REF: case ARRAY_RANGE_REF:
6014 case REALPART_EXPR: case IMAGPART_EXPR:
6016 return addressable_p (TREE_OPERAND (gnu_expr, 0));
6019 return (AGGREGATE_TYPE_P (TREE_TYPE (gnu_expr))
6020 && addressable_p (TREE_OPERAND (gnu_expr, 0)));
6022 case VIEW_CONVERT_EXPR:
6024 /* This is addressable if we can avoid a copy. */
6025 tree type = TREE_TYPE (gnu_expr);
6026 tree inner_type = TREE_TYPE (TREE_OPERAND (gnu_expr, 0));
6028 return (((TYPE_MODE (type) == TYPE_MODE (inner_type)
6029 && (TYPE_ALIGN (type) <= TYPE_ALIGN (inner_type)
6030 || TYPE_ALIGN (inner_type) >= BIGGEST_ALIGNMENT))
6031 || ((TYPE_MODE (type) == BLKmode
6032 || TYPE_MODE (inner_type) == BLKmode)
6033 && (TYPE_ALIGN (type) <= TYPE_ALIGN (inner_type)
6034 || TYPE_ALIGN (inner_type) >= BIGGEST_ALIGNMENT
6035 || TYPE_ALIGN_OK (type)
6036 || TYPE_ALIGN_OK (inner_type))))
6037 && addressable_p (TREE_OPERAND (gnu_expr, 0)));
6045 /* Do the processing for the declaration of a GNAT_ENTITY, a type. If
6046 a separate Freeze node exists, delay the bulk of the processing. Otherwise
6047 make a GCC type for GNAT_ENTITY and set up the correspondence. */
6050 process_type (Entity_Id gnat_entity)
6053 = present_gnu_tree (gnat_entity) ? get_gnu_tree (gnat_entity) : 0;
6056 /* If we are to delay elaboration of this type, just do any
6057 elaborations needed for expressions within the declaration and
6058 make a dummy type entry for this node and its Full_View (if
6059 any) in case something points to it. Don't do this if it
6060 has already been done (the only way that can happen is if
6061 the private completion is also delayed). */
6062 if (Present (Freeze_Node (gnat_entity))
6063 || (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
6064 && Present (Full_View (gnat_entity))
6065 && Freeze_Node (Full_View (gnat_entity))
6066 && !present_gnu_tree (Full_View (gnat_entity))))
6068 elaborate_entity (gnat_entity);
6072 tree gnu_decl = create_type_decl (get_entity_name (gnat_entity),
6073 make_dummy_type (gnat_entity),
6074 NULL, false, false, gnat_entity);
6076 save_gnu_tree (gnat_entity, gnu_decl, false);
6077 if (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
6078 && Present (Full_View (gnat_entity)))
6079 save_gnu_tree (Full_View (gnat_entity), gnu_decl, false);
6085 /* If we saved away a dummy type for this node it means that this
6086 made the type that corresponds to the full type of an incomplete
6087 type. Clear that type for now and then update the type in the
6091 gcc_assert (TREE_CODE (gnu_old) == TYPE_DECL
6092 && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_old)));
6094 save_gnu_tree (gnat_entity, NULL_TREE, false);
6097 /* Now fully elaborate the type. */
6098 gnu_new = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 1);
6099 gcc_assert (TREE_CODE (gnu_new) == TYPE_DECL);
6101 /* If we have an old type and we've made pointers to this type,
6102 update those pointers. */
6104 update_pointer_to (TYPE_MAIN_VARIANT (TREE_TYPE (gnu_old)),
6105 TREE_TYPE (gnu_new));
6107 /* If this is a record type corresponding to a task or protected type
6108 that is a completion of an incomplete type, perform a similar update
6110 /* ??? Including protected types here is a guess. */
6112 if (IN (Ekind (gnat_entity), Record_Kind)
6113 && Is_Concurrent_Record_Type (gnat_entity)
6114 && present_gnu_tree (Corresponding_Concurrent_Type (gnat_entity)))
6117 = get_gnu_tree (Corresponding_Concurrent_Type (gnat_entity));
6119 save_gnu_tree (Corresponding_Concurrent_Type (gnat_entity),
6121 save_gnu_tree (Corresponding_Concurrent_Type (gnat_entity),
6124 update_pointer_to (TYPE_MAIN_VARIANT (TREE_TYPE (gnu_task_old)),
6125 TREE_TYPE (gnu_new));
6129 /* GNAT_ENTITY is the type of the resulting constructors,
6130 GNAT_ASSOC is the front of the Component_Associations of an N_Aggregate,
6131 and GNU_TYPE is the GCC type of the corresponding record.
6133 Return a CONSTRUCTOR to build the record. */
6136 assoc_to_constructor (Entity_Id gnat_entity, Node_Id gnat_assoc, tree gnu_type)
6138 tree gnu_list, gnu_result;
6140 /* We test for GNU_FIELD being empty in the case where a variant
6141 was the last thing since we don't take things off GNAT_ASSOC in
6142 that case. We check GNAT_ASSOC in case we have a variant, but it
6145 for (gnu_list = NULL_TREE; Present (gnat_assoc);
6146 gnat_assoc = Next (gnat_assoc))
6148 Node_Id gnat_field = First (Choices (gnat_assoc));
6149 tree gnu_field = gnat_to_gnu_field_decl (Entity (gnat_field));
6150 tree gnu_expr = gnat_to_gnu (Expression (gnat_assoc));
6152 /* The expander is supposed to put a single component selector name
6153 in every record component association */
6154 gcc_assert (No (Next (gnat_field)));
6156 /* Ignore fields that have Corresponding_Discriminants since we'll
6157 be setting that field in the parent. */
6158 if (Present (Corresponding_Discriminant (Entity (gnat_field)))
6159 && Is_Tagged_Type (Scope (Entity (gnat_field))))
6162 /* Also ignore discriminants of Unchecked_Unions. */
6163 else if (Is_Unchecked_Union (gnat_entity)
6164 && Ekind (Entity (gnat_field)) == E_Discriminant)
6167 /* Before assigning a value in an aggregate make sure range checks
6168 are done if required. Then convert to the type of the field. */
6169 if (Do_Range_Check (Expression (gnat_assoc)))
6170 gnu_expr = emit_range_check (gnu_expr, Etype (gnat_field));
6172 gnu_expr = convert (TREE_TYPE (gnu_field), gnu_expr);
6174 /* Add the field and expression to the list. */
6175 gnu_list = tree_cons (gnu_field, gnu_expr, gnu_list);
6178 gnu_result = extract_values (gnu_list, gnu_type);
6180 #ifdef ENABLE_CHECKING
6184 /* Verify every enty in GNU_LIST was used. */
6185 for (gnu_field = gnu_list; gnu_field; gnu_field = TREE_CHAIN (gnu_field))
6186 gcc_assert (TREE_ADDRESSABLE (gnu_field));
6193 /* Builds a possibly nested constructor for array aggregates. GNAT_EXPR
6194 is the first element of an array aggregate. It may itself be an
6195 aggregate (an array or record aggregate). GNU_ARRAY_TYPE is the gnu type
6196 corresponding to the array aggregate. GNAT_COMPONENT_TYPE is the type
6197 of the array component. It is needed for range checking. */
6200 pos_to_constructor (Node_Id gnat_expr, tree gnu_array_type,
6201 Entity_Id gnat_component_type)
6203 tree gnu_expr_list = NULL_TREE;
6204 tree gnu_index = TYPE_MIN_VALUE (TYPE_DOMAIN (gnu_array_type));
6207 for ( ; Present (gnat_expr); gnat_expr = Next (gnat_expr))
6209 /* If the expression is itself an array aggregate then first build the
6210 innermost constructor if it is part of our array (multi-dimensional
6213 if (Nkind (gnat_expr) == N_Aggregate
6214 && TREE_CODE (TREE_TYPE (gnu_array_type)) == ARRAY_TYPE
6215 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_array_type)))
6216 gnu_expr = pos_to_constructor (First (Expressions (gnat_expr)),
6217 TREE_TYPE (gnu_array_type),
6218 gnat_component_type);
6221 gnu_expr = gnat_to_gnu (gnat_expr);
6223 /* before assigning the element to the array make sure it is
6225 if (Do_Range_Check (gnat_expr))
6226 gnu_expr = emit_range_check (gnu_expr, gnat_component_type);
6230 = tree_cons (gnu_index, convert (TREE_TYPE (gnu_array_type), gnu_expr),
6233 gnu_index = int_const_binop (PLUS_EXPR, gnu_index, integer_one_node, 0);
6236 return gnat_build_constructor (gnu_array_type, nreverse (gnu_expr_list));
6239 /* Subroutine of assoc_to_constructor: VALUES is a list of field associations,
6240 some of which are from RECORD_TYPE. Return a CONSTRUCTOR consisting
6241 of the associations that are from RECORD_TYPE. If we see an internal
6242 record, make a recursive call to fill it in as well. */
6245 extract_values (tree values, tree record_type)
6247 tree result = NULL_TREE;
6250 for (field = TYPE_FIELDS (record_type); field; field = TREE_CHAIN (field))
6254 /* _Parent is an internal field, but may have values in the aggregate,
6255 so check for values first. */
6256 if ((tem = purpose_member (field, values)))
6258 value = TREE_VALUE (tem);
6259 TREE_ADDRESSABLE (tem) = 1;
6262 else if (DECL_INTERNAL_P (field))
6264 value = extract_values (values, TREE_TYPE (field));
6265 if (TREE_CODE (value) == CONSTRUCTOR
6266 && VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (value)))
6270 /* If we have a record subtype, the names will match, but not the
6271 actual FIELD_DECLs. */
6272 for (tem = values; tem; tem = TREE_CHAIN (tem))
6273 if (DECL_NAME (TREE_PURPOSE (tem)) == DECL_NAME (field))
6275 value = convert (TREE_TYPE (field), TREE_VALUE (tem));
6276 TREE_ADDRESSABLE (tem) = 1;
6282 result = tree_cons (field, value, result);
6285 return gnat_build_constructor (record_type, nreverse (result));
6288 /* EXP is to be treated as an array or record. Handle the cases when it is
6289 an access object and perform the required dereferences. */
6292 maybe_implicit_deref (tree exp)
6294 /* If the type is a pointer, dereference it. */
6296 if (POINTER_TYPE_P (TREE_TYPE (exp)) || TYPE_FAT_POINTER_P (TREE_TYPE (exp)))
6297 exp = build_unary_op (INDIRECT_REF, NULL_TREE, exp);
6299 /* If we got a padded type, remove it too. */
6300 if (TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE
6301 && TYPE_IS_PADDING_P (TREE_TYPE (exp)))
6302 exp = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (exp))), exp);
6307 /* Protect EXP from multiple evaluation. This may make a SAVE_EXPR. */
6310 protect_multiple_eval (tree exp)
6312 tree type = TREE_TYPE (exp);
6314 /* If this has no side effects, we don't need to do anything. */
6315 if (!TREE_SIDE_EFFECTS (exp))
6318 /* If it is a conversion, protect what's inside the conversion.
6319 Similarly, if we're indirectly referencing something, we only
6320 actually need to protect the address since the data itself can't
6321 change in these situations. */
6322 else if (TREE_CODE (exp) == NON_LVALUE_EXPR
6323 || TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR
6324 || TREE_CODE (exp) == VIEW_CONVERT_EXPR
6325 || TREE_CODE (exp) == INDIRECT_REF
6326 || TREE_CODE (exp) == UNCONSTRAINED_ARRAY_REF)
6327 return build1 (TREE_CODE (exp), type,
6328 protect_multiple_eval (TREE_OPERAND (exp, 0)));
6330 /* If EXP is a fat pointer or something that can be placed into a register,
6331 just make a SAVE_EXPR. */
6332 if (TYPE_FAT_POINTER_P (type) || TYPE_MODE (type) != BLKmode)
6333 return save_expr (exp);
6335 /* Otherwise, dereference, protect the address, and re-reference. */
6338 build_unary_op (INDIRECT_REF, type,
6339 save_expr (build_unary_op (ADDR_EXPR,
6340 build_reference_type (type),
6344 /* This is equivalent to stabilize_reference in tree.c, but we know how to
6345 handle our own nodes and we take extra arguments. FORCE says whether to
6346 force evaluation of everything. We set SUCCESS to true unless we walk
6347 through something we don't know how to stabilize. */
6350 maybe_stabilize_reference (tree ref, bool force, bool *success)
6352 tree type = TREE_TYPE (ref);
6353 enum tree_code code = TREE_CODE (ref);
6356 /* Assume we'll success unless proven otherwise. */
6364 /* No action is needed in this case. */
6371 case FIX_TRUNC_EXPR:
6372 case VIEW_CONVERT_EXPR:
6374 = build1 (code, type,
6375 maybe_stabilize_reference (TREE_OPERAND (ref, 0), force,
6380 case UNCONSTRAINED_ARRAY_REF:
6381 result = build1 (code, type,
6382 gnat_stabilize_reference_1 (TREE_OPERAND (ref, 0),
6387 result = build3 (COMPONENT_REF, type,
6388 maybe_stabilize_reference (TREE_OPERAND (ref, 0), force,
6390 TREE_OPERAND (ref, 1), NULL_TREE);
6394 result = build3 (BIT_FIELD_REF, type,
6395 maybe_stabilize_reference (TREE_OPERAND (ref, 0), force,
6397 gnat_stabilize_reference_1 (TREE_OPERAND (ref, 1),
6399 gnat_stabilize_reference_1 (TREE_OPERAND (ref, 2),
6404 case ARRAY_RANGE_REF:
6405 result = build4 (code, type,
6406 maybe_stabilize_reference (TREE_OPERAND (ref, 0), force,
6408 gnat_stabilize_reference_1 (TREE_OPERAND (ref, 1),
6410 NULL_TREE, NULL_TREE);
6414 result = gnat_stabilize_reference_1 (ref, force);
6418 /* This generates better code than the scheme in protect_multiple_eval
6419 because large objects will be returned via invisible reference in
6420 most ABIs so the temporary will directly be filled by the callee. */
6421 result = gnat_stabilize_reference_1 (ref, force);
6425 ref = error_mark_node;
6427 /* ... Fallthru to failure ... */
6429 /* If arg isn't a kind of lvalue we recognize, make no change.
6430 Caller should recognize the error for an invalid lvalue. */
6436 TREE_READONLY (result) = TREE_READONLY (ref);
6438 /* TREE_THIS_VOLATILE and TREE_SIDE_EFFECTS attached to the initial
6439 expression may not be sustained across some paths, such as the way via
6440 build1 for INDIRECT_REF. We re-populate those flags here for the general
6441 case, which is consistent with the GCC version of this routine.
6443 Special care should be taken regarding TREE_SIDE_EFFECTS, because some
6444 paths introduce side effects where there was none initially (e.g. calls
6445 to save_expr), and we also want to keep track of that. */
6447 TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (ref);
6448 TREE_SIDE_EFFECTS (result) |= TREE_SIDE_EFFECTS (ref);
6453 /* Wrapper around maybe_stabilize_reference, for common uses without
6454 lvalue restrictions and without need to examine the success
6458 gnat_stabilize_reference (tree ref, bool force)
6461 return maybe_stabilize_reference (ref, force, &dummy);
6464 /* Similar to stabilize_reference_1 in tree.c, but supports an extra
6465 arg to force a SAVE_EXPR for everything. */
6468 gnat_stabilize_reference_1 (tree e, bool force)
6470 enum tree_code code = TREE_CODE (e);
6471 tree type = TREE_TYPE (e);
6474 /* We cannot ignore const expressions because it might be a reference
6475 to a const array but whose index contains side-effects. But we can
6476 ignore things that are actual constant or that already have been
6477 handled by this function. */
6479 if (TREE_CONSTANT (e) || code == SAVE_EXPR)
6482 switch (TREE_CODE_CLASS (code))
6484 case tcc_exceptional:
6486 case tcc_declaration:
6487 case tcc_comparison:
6489 case tcc_expression:
6492 /* If this is a COMPONENT_REF of a fat pointer, save the entire
6493 fat pointer. This may be more efficient, but will also allow
6494 us to more easily find the match for the PLACEHOLDER_EXPR. */
6495 if (code == COMPONENT_REF
6496 && TYPE_FAT_POINTER_P (TREE_TYPE (TREE_OPERAND (e, 0))))
6497 result = build3 (COMPONENT_REF, type,
6498 gnat_stabilize_reference_1 (TREE_OPERAND (e, 0),
6500 TREE_OPERAND (e, 1), TREE_OPERAND (e, 2));
6501 else if (TREE_SIDE_EFFECTS (e) || force)
6502 return save_expr (e);
6508 /* Constants need no processing. In fact, we should never reach
6513 /* Recursively stabilize each operand. */
6514 result = build2 (code, type,
6515 gnat_stabilize_reference_1 (TREE_OPERAND (e, 0), force),
6516 gnat_stabilize_reference_1 (TREE_OPERAND (e, 1),
6521 /* Recursively stabilize each operand. */
6522 result = build1 (code, type,
6523 gnat_stabilize_reference_1 (TREE_OPERAND (e, 0),
6531 TREE_READONLY (result) = TREE_READONLY (e);
6533 TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (e);
6534 TREE_SIDE_EFFECTS (result) |= TREE_SIDE_EFFECTS (e);
6538 extern char *__gnat_to_canonical_file_spec (char *);
6540 /* Convert Sloc into *LOCUS (a location_t). Return true if this Sloc
6541 corresponds to a source code location and false if it doesn't. In the
6542 latter case, we don't update *LOCUS. We also set the Gigi global variable
6543 REF_FILENAME to the reference file name as given by sinput (i.e no
6547 Sloc_to_locus (Source_Ptr Sloc, location_t *locus)
6549 /* If node not from source code, ignore. */
6553 /* Use the identifier table to make a hashed, permanent copy of the filename,
6554 since the name table gets reallocated after Gigi returns but before all
6555 the debugging information is output. The __gnat_to_canonical_file_spec
6556 call translates filenames from pragmas Source_Reference that contain host
6557 style syntax not understood by gdb. */
6559 = IDENTIFIER_POINTER
6561 (__gnat_to_canonical_file_spec
6562 (Get_Name_String (Full_Debug_Name (Get_Source_File_Index (Sloc))))));
6564 locus->line = Get_Logical_Line_Number (Sloc);
6567 = IDENTIFIER_POINTER
6569 (Get_Name_String (Debug_Source_Name (Get_Source_File_Index (Sloc)))));;
6574 /* Similar to annotate_with_locus, but start with the Sloc of GNAT_NODE and
6575 don't do anything if it doesn't correspond to a source location. */
6578 annotate_with_node (tree node, Node_Id gnat_node)
6582 if (!Sloc_to_locus (Sloc (gnat_node), &locus))
6585 annotate_with_locus (node, locus);
6588 /* Post an error message. MSG is the error message, properly annotated.
6589 NODE is the node at which to post the error and the node to use for the
6590 "&" substitution. */
6593 post_error (const char *msg, Node_Id node)
6595 String_Template temp;
6598 temp.Low_Bound = 1, temp.High_Bound = strlen (msg);
6599 fp.Array = msg, fp.Bounds = &temp;
6601 Error_Msg_N (fp, node);
6604 /* Similar, but NODE is the node at which to post the error and ENT
6605 is the node to use for the "&" substitution. */
6608 post_error_ne (const char *msg, Node_Id node, Entity_Id ent)
6610 String_Template temp;
6613 temp.Low_Bound = 1, temp.High_Bound = strlen (msg);
6614 fp.Array = msg, fp.Bounds = &temp;
6616 Error_Msg_NE (fp, node, ent);
6619 /* Similar, but NODE is the node at which to post the error, ENT is the node
6620 to use for the "&" substitution, and N is the number to use for the ^. */
6623 post_error_ne_num (const char *msg, Node_Id node, Entity_Id ent, int n)
6625 String_Template temp;
6628 temp.Low_Bound = 1, temp.High_Bound = strlen (msg);
6629 fp.Array = msg, fp.Bounds = &temp;
6630 Error_Msg_Uint_1 = UI_From_Int (n);
6633 Error_Msg_NE (fp, node, ent);
6636 /* Similar to post_error_ne_num, but T is a GCC tree representing the
6637 number to write. If the tree represents a constant that fits within
6638 a host integer, the text inside curly brackets in MSG will be output
6639 (presumably including a '^'). Otherwise that text will not be output
6640 and the text inside square brackets will be output instead. */
6643 post_error_ne_tree (const char *msg, Node_Id node, Entity_Id ent, tree t)
6645 char *newmsg = alloca (strlen (msg) + 1);
6646 String_Template temp = {1, 0};
6648 char start_yes, end_yes, start_no, end_no;
6652 fp.Array = newmsg, fp.Bounds = &temp;
6654 if (host_integerp (t, 1)
6655 #if HOST_BITS_PER_WIDE_INT > HOST_BITS_PER_INT
6658 (t, (((unsigned HOST_WIDE_INT) 1 << (HOST_BITS_PER_INT - 1)) - 1)) < 0
6662 Error_Msg_Uint_1 = UI_From_Int (tree_low_cst (t, 1));
6663 start_yes = '{', end_yes = '}', start_no = '[', end_no = ']';
6666 start_yes = '[', end_yes = ']', start_no = '{', end_no = '}';
6668 for (p = msg, q = newmsg; *p; p++)
6670 if (*p == start_yes)
6671 for (p++; *p != end_yes; p++)
6673 else if (*p == start_no)
6674 for (p++; *p != end_no; p++)
6682 temp.High_Bound = strlen (newmsg);
6684 Error_Msg_NE (fp, node, ent);
6687 /* Similar to post_error_ne_tree, except that NUM is a second
6688 integer to write in the message. */
6691 post_error_ne_tree_2 (const char *msg,
6697 Error_Msg_Uint_2 = UI_From_Int (num);
6698 post_error_ne_tree (msg, node, ent, t);
6701 /* Initialize the table that maps GNAT codes to GCC codes for simple
6702 binary and unary operations. */
6705 init_code_table (void)
6707 gnu_codes[N_And_Then] = TRUTH_ANDIF_EXPR;
6708 gnu_codes[N_Or_Else] = TRUTH_ORIF_EXPR;
6710 gnu_codes[N_Op_And] = TRUTH_AND_EXPR;
6711 gnu_codes[N_Op_Or] = TRUTH_OR_EXPR;
6712 gnu_codes[N_Op_Xor] = TRUTH_XOR_EXPR;
6713 gnu_codes[N_Op_Eq] = EQ_EXPR;
6714 gnu_codes[N_Op_Ne] = NE_EXPR;
6715 gnu_codes[N_Op_Lt] = LT_EXPR;
6716 gnu_codes[N_Op_Le] = LE_EXPR;
6717 gnu_codes[N_Op_Gt] = GT_EXPR;
6718 gnu_codes[N_Op_Ge] = GE_EXPR;
6719 gnu_codes[N_Op_Add] = PLUS_EXPR;
6720 gnu_codes[N_Op_Subtract] = MINUS_EXPR;
6721 gnu_codes[N_Op_Multiply] = MULT_EXPR;
6722 gnu_codes[N_Op_Mod] = FLOOR_MOD_EXPR;
6723 gnu_codes[N_Op_Rem] = TRUNC_MOD_EXPR;
6724 gnu_codes[N_Op_Minus] = NEGATE_EXPR;
6725 gnu_codes[N_Op_Abs] = ABS_EXPR;
6726 gnu_codes[N_Op_Not] = TRUTH_NOT_EXPR;
6727 gnu_codes[N_Op_Rotate_Left] = LROTATE_EXPR;
6728 gnu_codes[N_Op_Rotate_Right] = RROTATE_EXPR;
6729 gnu_codes[N_Op_Shift_Left] = LSHIFT_EXPR;
6730 gnu_codes[N_Op_Shift_Right] = RSHIFT_EXPR;
6731 gnu_codes[N_Op_Shift_Right_Arithmetic] = RSHIFT_EXPR;
6734 #include "gt-ada-trans.h"
6735 /* Return a label to branch to for the exception type in KIND or NULL_TREE
6739 get_exception_label (char kind)
6741 if (kind == N_Raise_Constraint_Error)
6742 return TREE_VALUE (gnu_constraint_error_label_stack);
6743 else if (kind == N_Raise_Storage_Error)
6744 return TREE_VALUE (gnu_storage_error_label_stack);
6745 else if (kind == N_Raise_Program_Error)
6746 return TREE_VALUE (gnu_program_error_label_stack);