1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 1992-2005, 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, 59 Temple Place - Suite 330, Boston, *
20 * MA 02111-1307, 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"
42 #include "tree-gimple.h"
61 struct Node *Nodes_Ptr;
62 Node_Id *Next_Node_Ptr;
63 Node_Id *Prev_Node_Ptr;
64 struct Elist_Header *Elists_Ptr;
65 struct Elmt_Item *Elmts_Ptr;
66 struct String_Entry *Strings_Ptr;
67 Char_Code *String_Chars_Ptr;
68 struct List_Header *List_Headers_Ptr;
70 /* Current filename without path. */
71 const char *ref_filename;
73 /* If true, then gigi is being called on an analyzed but unexpanded
74 tree, and the only purpose of the call is to properly annotate
75 types with representation information. */
76 bool type_annotate_only;
78 /* A structure used to gather together information about a statement group.
79 We use this to gather related statements, for example the "then" part
80 of a IF. In the case where it represents a lexical scope, we may also
81 have a BLOCK node corresponding to it and/or cleanups. */
83 struct stmt_group GTY((chain_next ("%h.previous"))) {
84 struct stmt_group *previous; /* Previous code group. */
85 tree stmt_list; /* List of statements for this code group. */
86 tree block; /* BLOCK for this code group, if any. */
87 tree cleanups; /* Cleanups for this code group, if any. */
90 static GTY(()) struct stmt_group *current_stmt_group;
92 /* List of unused struct stmt_group nodes. */
93 static GTY((deletable)) struct stmt_group *stmt_group_free_list;
95 /* A structure used to record information on elaboration procedures
96 we've made and need to process.
98 ??? gnat_node should be Node_Id, but gengtype gets confused. */
100 struct elab_info GTY((chain_next ("%h.next"))) {
101 struct elab_info *next; /* Pointer to next in chain. */
102 tree elab_proc; /* Elaboration procedure. */
103 int gnat_node; /* The N_Compilation_Unit. */
106 static GTY(()) struct elab_info *elab_info_list;
108 /* Free list of TREE_LIST nodes used for stacks. */
109 static GTY((deletable)) tree gnu_stack_free_list;
111 /* List of TREE_LIST nodes representing a stack of exception pointer
112 variables. TREE_VALUE is the VAR_DECL that stores the address of
113 the raised exception. Nonzero means we are in an exception
114 handler. Not used in the zero-cost case. */
115 static GTY(()) tree gnu_except_ptr_stack;
117 /* List of TREE_LIST nodes used to store the current elaboration procedure
118 decl. TREE_VALUE is the decl. */
119 static GTY(()) tree gnu_elab_proc_stack;
121 /* Variable that stores a list of labels to be used as a goto target instead of
122 a return in some functions. See processing for N_Subprogram_Body. */
123 static GTY(()) tree gnu_return_label_stack;
125 /* List of TREE_LIST nodes representing a stack of LOOP_STMT nodes.
126 TREE_VALUE of each entry is the label of the corresponding LOOP_STMT. */
127 static GTY(()) tree gnu_loop_label_stack;
129 /* List of TREE_LIST nodes representing labels for switch statements.
130 TREE_VALUE of each entry is the label at the end of the switch. */
131 static GTY(()) tree gnu_switch_label_stack;
133 /* Map GNAT tree codes to GCC tree codes for simple expressions. */
134 static enum tree_code gnu_codes[Number_Node_Kinds];
136 /* Current node being treated, in case abort called. */
137 Node_Id error_gnat_node;
139 static void Compilation_Unit_to_gnu (Node_Id);
140 static void record_code_position (Node_Id);
141 static void insert_code_for (Node_Id);
142 static void start_stmt_group (void);
143 static void add_cleanup (tree);
144 static tree mark_visited (tree *, int *, void *);
145 static tree mark_unvisited (tree *, int *, void *);
146 static tree end_stmt_group (void);
147 static void add_stmt_list (List_Id);
148 static tree build_stmt_group (List_Id, bool);
149 static void push_stack (tree *, tree, tree);
150 static void pop_stack (tree *);
151 static enum gimplify_status gnat_gimplify_stmt (tree *);
152 static void elaborate_all_entities (Node_Id);
153 static void process_freeze_entity (Node_Id);
154 static void process_inlined_subprograms (Node_Id);
155 static void process_decls (List_Id, List_Id, Node_Id, bool, bool);
156 static tree emit_range_check (tree, Node_Id);
157 static tree emit_index_check (tree, tree, tree, tree);
158 static tree emit_check (tree, tree, int);
159 static tree convert_with_check (Entity_Id, tree, bool, bool, bool);
160 static bool addressable_p (tree);
161 static tree assoc_to_constructor (Node_Id, tree);
162 static tree extract_values (tree, tree);
163 static tree pos_to_constructor (Node_Id, tree, Entity_Id);
164 static tree maybe_implicit_deref (tree);
165 static tree gnat_stabilize_reference_1 (tree, bool);
166 static void annotate_with_node (tree, Node_Id);
169 /* This is the main program of the back-end. It sets up all the table
170 structures and then generates code. */
173 gigi (Node_Id gnat_root, int max_gnat_node, int number_name,
174 struct Node *nodes_ptr, Node_Id *next_node_ptr, Node_Id *prev_node_ptr,
175 struct Elist_Header *elists_ptr, struct Elmt_Item *elmts_ptr,
176 struct String_Entry *strings_ptr, Char_Code *string_chars_ptr,
177 struct List_Header *list_headers_ptr, Int number_units ATTRIBUTE_UNUSED,
178 char *file_info_ptr ATTRIBUTE_UNUSED, Entity_Id standard_integer,
179 Entity_Id standard_long_long_float, Entity_Id standard_exception_type,
180 Int gigi_operating_mode)
182 tree gnu_standard_long_long_float;
183 tree gnu_standard_exception_type;
184 struct elab_info *info;
186 max_gnat_nodes = max_gnat_node;
187 number_names = number_name;
188 Nodes_Ptr = nodes_ptr;
189 Next_Node_Ptr = next_node_ptr;
190 Prev_Node_Ptr = prev_node_ptr;
191 Elists_Ptr = elists_ptr;
192 Elmts_Ptr = elmts_ptr;
193 Strings_Ptr = strings_ptr;
194 String_Chars_Ptr = string_chars_ptr;
195 List_Headers_Ptr = list_headers_ptr;
197 type_annotate_only = (gigi_operating_mode == 1);
200 gnat_compute_largest_alignment ();
203 /* If we are just annotating types, give VOID_TYPE zero sizes to avoid
205 if (type_annotate_only)
207 TYPE_SIZE (void_type_node) = bitsize_zero_node;
208 TYPE_SIZE_UNIT (void_type_node) = size_zero_node;
211 /* Save the type we made for integer as the type for Standard.Integer.
212 Then make the rest of the standard types. Note that some of these
214 save_gnu_tree (Base_Type (standard_integer), TYPE_NAME (integer_type_node),
217 gnu_except_ptr_stack = tree_cons (NULL_TREE, NULL_TREE, NULL_TREE);
219 gnu_standard_long_long_float
220 = gnat_to_gnu_entity (Base_Type (standard_long_long_float), NULL_TREE, 0);
221 gnu_standard_exception_type
222 = gnat_to_gnu_entity (Base_Type (standard_exception_type), NULL_TREE, 0);
224 init_gigi_decls (gnu_standard_long_long_float, gnu_standard_exception_type);
226 /* Process any Pragma Ident for the main unit. */
227 #ifdef ASM_OUTPUT_IDENT
228 if (Present (Ident_String (Main_Unit)))
231 TREE_STRING_POINTER (gnat_to_gnu (Ident_String (Main_Unit))));
234 /* If we are using the GCC exception mechanism, let GCC know. */
235 if (Exception_Mechanism == GCC_ZCX)
238 gcc_assert (Nkind (gnat_root) == N_Compilation_Unit);
239 Compilation_Unit_to_gnu (gnat_root);
241 /* Now see if we have any elaboration procedures to deal with. */
242 for (info = elab_info_list; info; info = info->next)
244 tree gnu_body = DECL_SAVED_TREE (info->elab_proc);
247 /* Mark everything we have as not visited. */
248 walk_tree_without_duplicates (&gnu_body, mark_unvisited, NULL);
250 /* Set the current function to be the elaboration procedure and gimplify
252 current_function_decl = info->elab_proc;
253 gimplify_body (&gnu_body, info->elab_proc, true);
255 /* We should have a BIND_EXPR, but it may or may not have any statements
256 in it. If it doesn't have any, we have nothing to do. */
257 gnu_stmts = gnu_body;
258 if (TREE_CODE (gnu_stmts) == BIND_EXPR)
259 gnu_stmts = BIND_EXPR_BODY (gnu_stmts);
261 /* If there are no statements, there is no elaboration code. */
262 if (!gnu_stmts || !STATEMENT_LIST_HEAD (gnu_stmts))
263 Set_Has_No_Elaboration_Code (info->gnat_node, 1);
266 /* Otherwise, compile the function. Note that we'll be gimplifying
267 it twice, but that's fine for the nodes we use. */
268 begin_subprog_body (info->elab_proc);
269 end_subprog_body (gnu_body);
274 /* Perform initializations for this module. */
277 gnat_init_stmt_group ()
279 /* Initialize ourselves. */
283 /* Enable GNAT stack checking method if needed */
284 if (!Stack_Check_Probes_On_Target)
285 set_stack_check_libfunc (gen_rtx_SYMBOL_REF (Pmode, "_gnat_stack_check"));
287 gcc_assert (Exception_Mechanism != Front_End_ZCX);
290 /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Identifier,
291 to a GCC tree, which is returned. GNU_RESULT_TYPE_P is a pointer to
292 where we should place the result type. */
295 Identifier_to_gnu (Node_Id gnat_node, tree *gnu_result_type_p)
297 tree gnu_result_type;
299 Node_Id gnat_temp, gnat_temp_type;
301 /* If the Etype of this node does not equal the Etype of the Entity,
302 something is wrong with the entity map, probably in generic
303 instantiation. However, this does not apply to types. Since we sometime
304 have strange Ekind's, just do this test for objects. Also, if the Etype of
305 the Entity is private, the Etype of the N_Identifier is allowed to be the
306 full type and also we consider a packed array type to be the same as the
307 original type. Similarly, a class-wide type is equivalent to a subtype of
308 itself. Finally, if the types are Itypes, one may be a copy of the other,
309 which is also legal. */
310 gnat_temp = (Nkind (gnat_node) == N_Defining_Identifier
311 ? gnat_node : Entity (gnat_node));
312 gnat_temp_type = Etype (gnat_temp);
314 gcc_assert (Etype (gnat_node) == gnat_temp_type
315 || (Is_Packed (gnat_temp_type)
316 && Etype (gnat_node) == Packed_Array_Type (gnat_temp_type))
317 || (Is_Class_Wide_Type (Etype (gnat_node)))
318 || (IN (Ekind (gnat_temp_type), Private_Kind)
319 && Present (Full_View (gnat_temp_type))
320 && ((Etype (gnat_node) == Full_View (gnat_temp_type))
321 || (Is_Packed (Full_View (gnat_temp_type))
322 && (Etype (gnat_node)
323 == Packed_Array_Type (Full_View
324 (gnat_temp_type))))))
325 || (Is_Itype (Etype (gnat_node)) && Is_Itype (gnat_temp_type))
326 || !(Ekind (gnat_temp) == E_Variable
327 || Ekind (gnat_temp) == E_Component
328 || Ekind (gnat_temp) == E_Constant
329 || Ekind (gnat_temp) == E_Loop_Parameter
330 || IN (Ekind (gnat_temp), Formal_Kind)));
332 /* If this is a reference to a deferred constant whose partial view is an
333 unconstrained private type, the proper type is on the full view of the
334 constant, not on the full view of the type, which may be unconstrained.
336 This may be a reference to a type, for example in the prefix of the
337 attribute Position, generated for dispatching code (see Make_DT in
338 exp_disp,adb). In that case we need the type itself, not is parent,
339 in particular if it is a derived type */
340 if (Is_Private_Type (gnat_temp_type)
341 && Has_Unknown_Discriminants (gnat_temp_type)
342 && Present (Full_View (gnat_temp))
343 && !Is_Type (gnat_temp))
345 gnat_temp = Full_View (gnat_temp);
346 gnat_temp_type = Etype (gnat_temp);
347 gnu_result_type = get_unpadded_type (gnat_temp_type);
351 /* Expand the type of this identifier first, in case it is an enumeral
352 literal, which only get made when the type is expanded. There is no
353 order-of-elaboration issue here. We want to use the Actual_Subtype if
354 it has already been elaborated, otherwise the Etype. Avoid using
355 Actual_Subtype for packed arrays to simplify things. */
356 if ((Ekind (gnat_temp) == E_Constant
357 || Ekind (gnat_temp) == E_Variable || Is_Formal (gnat_temp))
358 && !(Is_Array_Type (Etype (gnat_temp))
359 && Present (Packed_Array_Type (Etype (gnat_temp))))
360 && Present (Actual_Subtype (gnat_temp))
361 && present_gnu_tree (Actual_Subtype (gnat_temp)))
362 gnat_temp_type = Actual_Subtype (gnat_temp);
364 gnat_temp_type = Etype (gnat_node);
366 gnu_result_type = get_unpadded_type (gnat_temp_type);
369 gnu_result = gnat_to_gnu_entity (gnat_temp, NULL_TREE, 0);
371 /* If we are in an exception handler, force this variable into memory to
372 ensure optimization does not remove stores that appear redundant but are
373 actually needed in case an exception occurs.
375 ??? Note that we need not do this if the variable is declared within the
376 handler, only if it is referenced in the handler and declared in an
377 enclosing block, but we have no way of testing that right now.
379 ??? Also, for now all we can do is make it volatile. But we only
381 if (TREE_VALUE (gnu_except_ptr_stack)
382 && TREE_CODE (gnu_result) == VAR_DECL)
383 TREE_THIS_VOLATILE (gnu_result) = TREE_SIDE_EFFECTS (gnu_result) = 1;
385 /* Some objects (such as parameters passed by reference, globals of
386 variable size, and renamed objects) actually represent the address
387 of the object. In that case, we must do the dereference. Likewise,
388 deal with parameters to foreign convention subprograms. Call fold
389 here since GNU_RESULT may be a CONST_DECL. */
390 if (DECL_P (gnu_result)
391 && (DECL_BY_REF_P (gnu_result)
392 || (TREE_CODE (gnu_result) == PARM_DECL
393 && DECL_BY_COMPONENT_PTR_P (gnu_result))))
395 bool ro = DECL_POINTS_TO_READONLY_P (gnu_result);
398 if (TREE_CODE (gnu_result) == PARM_DECL
399 && DECL_BY_COMPONENT_PTR_P (gnu_result))
401 = build_unary_op (INDIRECT_REF, NULL_TREE,
402 convert (build_pointer_type (gnu_result_type),
405 /* If it's a renaming pointer and we are at the right binding level,
406 we can reference the renamed object directly, since the renamed
407 expression has been protected against multiple evaluations. */
408 else if (TREE_CODE (gnu_result) == VAR_DECL
409 && (renamed_obj = DECL_RENAMED_OBJECT (gnu_result)) != 0
410 && (! DECL_RENAMING_GLOBAL_P (gnu_result)
411 || global_bindings_p ())
412 /* Make sure it's an lvalue like INDIRECT_REF. */
413 && (DECL_P (renamed_obj) || REFERENCE_CLASS_P (renamed_obj)))
414 gnu_result = renamed_obj;
416 gnu_result = build_unary_op (INDIRECT_REF, NULL_TREE,
419 TREE_READONLY (gnu_result) = TREE_STATIC (gnu_result) = ro;
422 /* The GNAT tree has the type of a function as the type of its result. Also
423 use the type of the result if the Etype is a subtype which is nominally
424 unconstrained. But remove any padding from the resulting type. */
425 if (TREE_CODE (TREE_TYPE (gnu_result)) == FUNCTION_TYPE
426 || Is_Constr_Subt_For_UN_Aliased (gnat_temp_type))
428 gnu_result_type = TREE_TYPE (gnu_result);
429 if (TREE_CODE (gnu_result_type) == RECORD_TYPE
430 && TYPE_IS_PADDING_P (gnu_result_type))
431 gnu_result_type = TREE_TYPE (TYPE_FIELDS (gnu_result_type));
434 /* We always want to return the underlying INTEGER_CST for an enumeration
435 literal to avoid the need to call fold in lots of places. But don't do
436 this is the parent will be taking the address of this object. */
437 if (TREE_CODE (gnu_result) == CONST_DECL)
439 gnat_temp = Parent (gnat_node);
440 if (!DECL_CONST_CORRESPONDING_VAR (gnu_result)
441 || (Nkind (gnat_temp) != N_Reference
442 && !(Nkind (gnat_temp) == N_Attribute_Reference
443 && ((Get_Attribute_Id (Attribute_Name (gnat_temp))
445 || (Get_Attribute_Id (Attribute_Name (gnat_temp))
447 || (Get_Attribute_Id (Attribute_Name (gnat_temp))
448 == Attr_Unchecked_Access)
449 || (Get_Attribute_Id (Attribute_Name (gnat_temp))
450 == Attr_Unrestricted_Access)))))
451 gnu_result = DECL_INITIAL (gnu_result);
454 *gnu_result_type_p = gnu_result_type;
458 /* Subroutine of gnat_to_gnu to process gnat_node, an N_Pragma. Return
459 any statements we generate. */
462 Pragma_to_gnu (Node_Id gnat_node)
465 tree gnu_result = alloc_stmt_list ();
467 /* Check for (and ignore) unrecognized pragma and do nothing if we are just
469 if (type_annotate_only || !Is_Pragma_Name (Chars (gnat_node)))
472 switch (Get_Pragma_Id (Chars (gnat_node)))
474 case Pragma_Inspection_Point:
475 /* Do nothing at top level: all such variables are already viewable. */
476 if (global_bindings_p ())
479 for (gnat_temp = First (Pragma_Argument_Associations (gnat_node));
481 gnat_temp = Next (gnat_temp))
483 tree gnu_expr = gnat_to_gnu (Expression (gnat_temp));
485 if (TREE_CODE (gnu_expr) == UNCONSTRAINED_ARRAY_REF)
486 gnu_expr = TREE_OPERAND (gnu_expr, 0);
488 gnu_expr = build1 (USE_STMT, void_type_node, gnu_expr);
489 annotate_with_node (gnu_expr, gnat_node);
490 append_to_statement_list (gnu_expr, &gnu_result);
494 case Pragma_Optimize:
495 switch (Chars (Expression
496 (First (Pragma_Argument_Associations (gnat_node)))))
498 case Name_Time: case Name_Space:
500 post_error ("insufficient -O value?", gnat_node);
505 post_error ("must specify -O0?", gnat_node);
513 case Pragma_Reviewable:
514 if (write_symbols == NO_DEBUG)
515 post_error ("must specify -g?", gnat_node);
521 /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Attribute,
522 to a GCC tree, which is returned. GNU_RESULT_TYPE_P is a pointer to
523 where we should place the result type. ATTRIBUTE is the attribute ID. */
526 Attribute_to_gnu (Node_Id gnat_node, tree *gnu_result_type_p, int attribute)
528 tree gnu_result = error_mark_node;
529 tree gnu_result_type;
531 bool prefix_unused = false;
532 tree gnu_prefix = gnat_to_gnu (Prefix (gnat_node));
533 tree gnu_type = TREE_TYPE (gnu_prefix);
535 /* If the input is a NULL_EXPR, make a new one. */
536 if (TREE_CODE (gnu_prefix) == NULL_EXPR)
538 *gnu_result_type_p = get_unpadded_type (Etype (gnat_node));
539 return build1 (NULL_EXPR, *gnu_result_type_p,
540 TREE_OPERAND (gnu_prefix, 0));
547 /* These are just conversions until since representation clauses for
548 enumerations are handled in the front end. */
550 bool checkp = Do_Range_Check (First (Expressions (gnat_node)));
552 gnu_result = gnat_to_gnu (First (Expressions (gnat_node)));
553 gnu_result_type = get_unpadded_type (Etype (gnat_node));
554 gnu_result = convert_with_check (Etype (gnat_node), gnu_result,
555 checkp, checkp, true);
561 /* These just add or subject the constant 1. Representation clauses for
562 enumerations are handled in the front-end. */
563 gnu_expr = gnat_to_gnu (First (Expressions (gnat_node)));
564 gnu_result_type = get_unpadded_type (Etype (gnat_node));
566 if (Do_Range_Check (First (Expressions (gnat_node))))
568 gnu_expr = protect_multiple_eval (gnu_expr);
571 (build_binary_op (EQ_EXPR, integer_type_node,
573 attribute == Attr_Pred
574 ? TYPE_MIN_VALUE (gnu_result_type)
575 : TYPE_MAX_VALUE (gnu_result_type)),
576 gnu_expr, CE_Range_Check_Failed);
580 = build_binary_op (attribute == Attr_Pred
581 ? MINUS_EXPR : PLUS_EXPR,
582 gnu_result_type, gnu_expr,
583 convert (gnu_result_type, integer_one_node));
587 case Attr_Unrestricted_Access:
588 /* Conversions don't change something's address but can cause us to miss
589 the COMPONENT_REF case below, so strip them off. */
590 gnu_prefix = remove_conversions (gnu_prefix,
591 !Must_Be_Byte_Aligned (gnat_node));
593 /* If we are taking 'Address of an unconstrained object, this is the
594 pointer to the underlying array. */
595 gnu_prefix = maybe_unconstrained_array (gnu_prefix);
597 /* ... fall through ... */
600 case Attr_Unchecked_Access:
601 case Attr_Code_Address:
602 gnu_result_type = get_unpadded_type (Etype (gnat_node));
604 = build_unary_op (((attribute == Attr_Address
605 || attribute == Attr_Unrestricted_Access)
606 && !Must_Be_Byte_Aligned (gnat_node))
607 ? ATTR_ADDR_EXPR : ADDR_EXPR,
608 gnu_result_type, gnu_prefix);
610 /* For 'Code_Address, find an inner ADDR_EXPR and mark it so that we
611 don't try to build a trampoline. */
612 if (attribute == Attr_Code_Address)
614 for (gnu_expr = gnu_result;
615 TREE_CODE (gnu_expr) == NOP_EXPR
616 || TREE_CODE (gnu_expr) == CONVERT_EXPR;
617 gnu_expr = TREE_OPERAND (gnu_expr, 0))
618 TREE_CONSTANT (gnu_expr) = 1;
620 if (TREE_CODE (gnu_expr) == ADDR_EXPR)
621 TREE_STATIC (gnu_expr) = TREE_CONSTANT (gnu_expr) = 1;
625 case Attr_Pool_Address:
628 tree gnu_ptr = gnu_prefix;
630 gnu_result_type = get_unpadded_type (Etype (gnat_node));
632 /* If this is an unconstrained array, we know the object must have been
633 allocated with the template in front of the object. So compute the
635 if (TYPE_FAT_POINTER_P (TREE_TYPE (gnu_ptr)))
637 = convert (build_pointer_type
638 (TYPE_OBJECT_RECORD_TYPE
639 (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (gnu_ptr)))),
642 gnu_obj_type = TREE_TYPE (TREE_TYPE (gnu_ptr));
643 if (TREE_CODE (gnu_obj_type) == RECORD_TYPE
644 && TYPE_CONTAINS_TEMPLATE_P (gnu_obj_type))
646 tree gnu_char_ptr_type = build_pointer_type (char_type_node);
647 tree gnu_pos = byte_position (TYPE_FIELDS (gnu_obj_type));
649 = convert (gnu_char_ptr_type,
650 size_diffop (size_zero_node, gnu_pos));
652 gnu_ptr = convert (gnu_char_ptr_type, gnu_ptr);
653 gnu_ptr = build_binary_op (MINUS_EXPR, gnu_char_ptr_type,
654 gnu_ptr, gnu_byte_offset);
657 gnu_result = convert (gnu_result_type, gnu_ptr);
662 case Attr_Object_Size:
663 case Attr_Value_Size:
664 case Attr_Max_Size_In_Storage_Elements:
665 gnu_expr = gnu_prefix;
667 /* Remove NOPS from gnu_expr and conversions from gnu_prefix.
668 We only use GNU_EXPR to see if a COMPONENT_REF was involved. */
669 while (TREE_CODE (gnu_expr) == NOP_EXPR)
670 gnu_expr = TREE_OPERAND (gnu_expr, 0)
673 gnu_prefix = remove_conversions (gnu_prefix, true);
674 prefix_unused = true;
675 gnu_type = TREE_TYPE (gnu_prefix);
677 /* Replace an unconstrained array type with the type of the underlying
678 array. We can't do this with a call to maybe_unconstrained_array
679 since we may have a TYPE_DECL. For 'Max_Size_In_Storage_Elements,
680 use the record type that will be used to allocate the object and its
682 if (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
684 gnu_type = TYPE_OBJECT_RECORD_TYPE (gnu_type);
685 if (attribute != Attr_Max_Size_In_Storage_Elements)
686 gnu_type = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)));
689 /* If we're looking for the size of a field, return the field size.
690 Otherwise, if the prefix is an object, or if 'Object_Size or
691 'Max_Size_In_Storage_Elements has been specified, the result is the
692 GCC size of the type. Otherwise, the result is the RM_Size of the
694 if (TREE_CODE (gnu_prefix) == COMPONENT_REF)
695 gnu_result = DECL_SIZE (TREE_OPERAND (gnu_prefix, 1));
696 else if (TREE_CODE (gnu_prefix) != TYPE_DECL
697 || attribute == Attr_Object_Size
698 || attribute == Attr_Max_Size_In_Storage_Elements)
700 /* If this is a padded type, the GCC size isn't relevant to the
701 programmer. Normally, what we want is the RM_Size, which was set
702 from the specified size, but if it was not set, we want the size
703 of the relevant field. Using the MAX of those two produces the
704 right result in all case. Don't use the size of the field if it's
705 a self-referential type, since that's never what's wanted. */
706 if (TREE_CODE (gnu_type) == RECORD_TYPE
707 && TYPE_IS_PADDING_P (gnu_type)
708 && TREE_CODE (gnu_expr) == COMPONENT_REF)
710 gnu_result = rm_size (gnu_type);
711 if (!(CONTAINS_PLACEHOLDER_P
712 (DECL_SIZE (TREE_OPERAND (gnu_expr, 1)))))
714 = size_binop (MAX_EXPR, gnu_result,
715 DECL_SIZE (TREE_OPERAND (gnu_expr, 1)));
718 gnu_result = TYPE_SIZE (gnu_type);
721 gnu_result = rm_size (gnu_type);
723 gcc_assert (gnu_result);
725 /* Deal with a self-referential size by returning the maximum size for a
726 type and by qualifying the size with the object for 'Size of an
728 if (CONTAINS_PLACEHOLDER_P (gnu_result))
730 if (TREE_CODE (gnu_prefix) != TYPE_DECL)
731 gnu_result = substitute_placeholder_in_expr (gnu_result, gnu_expr);
733 gnu_result = max_size (gnu_result, true);
736 /* If the type contains a template, subtract its size. */
737 if (TREE_CODE (gnu_type) == RECORD_TYPE
738 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
739 gnu_result = size_binop (MINUS_EXPR, gnu_result,
740 DECL_SIZE (TYPE_FIELDS (gnu_type)));
742 gnu_result_type = get_unpadded_type (Etype (gnat_node));
744 /* Always perform division using unsigned arithmetic as the size cannot
745 be negative, but may be an overflowed positive value. This provides
746 correct results for sizes up to 512 MB.
748 ??? Size should be calculated in storage elements directly. */
750 if (attribute == Attr_Max_Size_In_Storage_Elements)
751 gnu_result = convert (sizetype,
752 fold (build2 (CEIL_DIV_EXPR, bitsizetype,
753 gnu_result, bitsize_unit_node)));
757 if (TREE_CODE (gnu_prefix) == COMPONENT_REF
758 && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0)))
760 && (TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0)))))
761 gnu_prefix = TREE_OPERAND (gnu_prefix, 0);
763 gnu_type = TREE_TYPE (gnu_prefix);
764 gnu_result_type = get_unpadded_type (Etype (gnat_node));
765 prefix_unused = true;
767 if (TREE_CODE (gnu_prefix) == COMPONENT_REF)
768 gnu_result = size_int (DECL_ALIGN (TREE_OPERAND (gnu_prefix, 1)));
770 gnu_result = size_int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT);
775 case Attr_Range_Length:
776 prefix_unused = true;
778 if (INTEGRAL_TYPE_P (gnu_type) || TREE_CODE (gnu_type) == REAL_TYPE)
780 gnu_result_type = get_unpadded_type (Etype (gnat_node));
782 if (attribute == Attr_First)
783 gnu_result = TYPE_MIN_VALUE (gnu_type);
784 else if (attribute == Attr_Last)
785 gnu_result = TYPE_MAX_VALUE (gnu_type);
789 (MAX_EXPR, get_base_type (gnu_result_type),
791 (PLUS_EXPR, get_base_type (gnu_result_type),
792 build_binary_op (MINUS_EXPR,
793 get_base_type (gnu_result_type),
794 convert (gnu_result_type,
795 TYPE_MAX_VALUE (gnu_type)),
796 convert (gnu_result_type,
797 TYPE_MIN_VALUE (gnu_type))),
798 convert (gnu_result_type, integer_one_node)),
799 convert (gnu_result_type, integer_zero_node));
804 /* ... fall through ... */
808 int Dimension = (Present (Expressions (gnat_node))
809 ? UI_To_Int (Intval (First (Expressions (gnat_node))))
812 /* Make sure any implicit dereference gets done. */
813 gnu_prefix = maybe_implicit_deref (gnu_prefix);
814 gnu_prefix = maybe_unconstrained_array (gnu_prefix);
815 gnu_type = TREE_TYPE (gnu_prefix);
816 prefix_unused = true;
817 gnu_result_type = get_unpadded_type (Etype (gnat_node));
819 if (TYPE_CONVENTION_FORTRAN_P (gnu_type))
824 for (ndim = 1, gnu_type_temp = gnu_type;
825 TREE_CODE (TREE_TYPE (gnu_type_temp)) == ARRAY_TYPE
826 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type_temp));
827 ndim++, gnu_type_temp = TREE_TYPE (gnu_type_temp))
830 Dimension = ndim + 1 - Dimension;
833 for (; Dimension > 1; Dimension--)
834 gnu_type = TREE_TYPE (gnu_type);
836 gcc_assert (TREE_CODE (gnu_type) == ARRAY_TYPE);
837 if (attribute == Attr_First)
839 = TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type)));
840 else if (attribute == Attr_Last)
842 = TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type)));
844 /* 'Length or 'Range_Length. */
846 tree gnu_compute_type
847 = gnat_signed_or_unsigned_type (0,
848 get_base_type (gnu_result_type));
852 (MAX_EXPR, gnu_compute_type,
854 (PLUS_EXPR, gnu_compute_type,
856 (MINUS_EXPR, gnu_compute_type,
857 convert (gnu_compute_type,
859 (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type)))),
860 convert (gnu_compute_type,
862 (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))))),
863 convert (gnu_compute_type, integer_one_node)),
864 convert (gnu_compute_type, integer_zero_node));
867 /* If this has a PLACEHOLDER_EXPR, qualify it by the object we are
868 handling. Note that these attributes could not have been used on
869 an unconstrained array type. */
870 gnu_result = SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_result,
875 case Attr_Bit_Position:
881 HOST_WIDE_INT bitsize;
882 HOST_WIDE_INT bitpos;
884 tree gnu_field_bitpos;
885 tree gnu_field_offset;
887 enum machine_mode mode;
888 int unsignedp, volatilep;
890 gnu_result_type = get_unpadded_type (Etype (gnat_node));
891 gnu_prefix = remove_conversions (gnu_prefix, true);
892 prefix_unused = true;
894 /* We can have 'Bit on any object, but if it isn't a COMPONENT_REF,
895 the result is 0. Don't allow 'Bit on a bare component, though. */
896 if (attribute == Attr_Bit
897 && TREE_CODE (gnu_prefix) != COMPONENT_REF
898 && TREE_CODE (gnu_prefix) != FIELD_DECL)
900 gnu_result = integer_zero_node;
905 gcc_assert (TREE_CODE (gnu_prefix) == COMPONENT_REF
906 || (attribute == Attr_Bit_Position
907 && TREE_CODE (gnu_prefix) == FIELD_DECL));
909 get_inner_reference (gnu_prefix, &bitsize, &bitpos, &gnu_offset,
910 &mode, &unsignedp, &volatilep, false);
912 if (TREE_CODE (gnu_prefix) == COMPONENT_REF)
914 gnu_field_bitpos = bit_position (TREE_OPERAND (gnu_prefix, 1));
915 gnu_field_offset = byte_position (TREE_OPERAND (gnu_prefix, 1));
917 for (gnu_inner = TREE_OPERAND (gnu_prefix, 0);
918 TREE_CODE (gnu_inner) == COMPONENT_REF
919 && DECL_INTERNAL_P (TREE_OPERAND (gnu_inner, 1));
920 gnu_inner = TREE_OPERAND (gnu_inner, 0))
923 = size_binop (PLUS_EXPR, gnu_field_bitpos,
924 bit_position (TREE_OPERAND (gnu_inner, 1)));
926 = size_binop (PLUS_EXPR, gnu_field_offset,
927 byte_position (TREE_OPERAND (gnu_inner, 1)));
930 else if (TREE_CODE (gnu_prefix) == FIELD_DECL)
932 gnu_field_bitpos = bit_position (gnu_prefix);
933 gnu_field_offset = byte_position (gnu_prefix);
937 gnu_field_bitpos = bitsize_zero_node;
938 gnu_field_offset = size_zero_node;
944 gnu_result = gnu_field_offset;
949 gnu_result = size_int (bitpos % BITS_PER_UNIT);
953 gnu_result = bitsize_int (bitpos % BITS_PER_UNIT);
954 gnu_result = size_binop (PLUS_EXPR, gnu_result,
955 TYPE_SIZE (TREE_TYPE (gnu_prefix)));
956 gnu_result = size_binop (MINUS_EXPR, gnu_result,
960 case Attr_Bit_Position:
961 gnu_result = gnu_field_bitpos;
965 /* If this has a PLACEHOLDER_EXPR, qualify it by the object
967 gnu_result = SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_result, gnu_prefix);
974 tree gnu_lhs = gnat_to_gnu (First (Expressions (gnat_node)));
975 tree gnu_rhs = gnat_to_gnu (Next (First (Expressions (gnat_node))));
977 gnu_result_type = get_unpadded_type (Etype (gnat_node));
978 gnu_result = build_binary_op (attribute == Attr_Min
979 ? MIN_EXPR : MAX_EXPR,
980 gnu_result_type, gnu_lhs, gnu_rhs);
984 case Attr_Passed_By_Reference:
985 gnu_result = size_int (default_pass_by_ref (gnu_type)
986 || must_pass_by_ref (gnu_type));
987 gnu_result_type = get_unpadded_type (Etype (gnat_node));
990 case Attr_Component_Size:
991 if (TREE_CODE (gnu_prefix) == COMPONENT_REF
992 && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0)))
994 && (TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0)))))
995 gnu_prefix = TREE_OPERAND (gnu_prefix, 0);
997 gnu_prefix = maybe_implicit_deref (gnu_prefix);
998 gnu_type = TREE_TYPE (gnu_prefix);
1000 if (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
1001 gnu_type = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_type))));
1003 while (TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE
1004 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type)))
1005 gnu_type = TREE_TYPE (gnu_type);
1007 gcc_assert (TREE_CODE (gnu_type) == ARRAY_TYPE);
1009 /* Note this size cannot be self-referential. */
1010 gnu_result = TYPE_SIZE (TREE_TYPE (gnu_type));
1011 gnu_result_type = get_unpadded_type (Etype (gnat_node));
1012 prefix_unused = true;
1015 case Attr_Null_Parameter:
1016 /* This is just a zero cast to the pointer type for
1017 our prefix and dereferenced. */
1018 gnu_result_type = get_unpadded_type (Etype (gnat_node));
1020 = build_unary_op (INDIRECT_REF, NULL_TREE,
1021 convert (build_pointer_type (gnu_result_type),
1022 integer_zero_node));
1023 TREE_PRIVATE (gnu_result) = 1;
1026 case Attr_Mechanism_Code:
1029 Entity_Id gnat_obj = Entity (Prefix (gnat_node));
1031 prefix_unused = true;
1032 gnu_result_type = get_unpadded_type (Etype (gnat_node));
1033 if (Present (Expressions (gnat_node)))
1035 int i = UI_To_Int (Intval (First (Expressions (gnat_node))));
1037 for (gnat_obj = First_Formal (gnat_obj); i > 1;
1038 i--, gnat_obj = Next_Formal (gnat_obj))
1042 code = Mechanism (gnat_obj);
1043 if (code == Default)
1044 code = ((present_gnu_tree (gnat_obj)
1045 && (DECL_BY_REF_P (get_gnu_tree (gnat_obj))
1046 || ((TREE_CODE (get_gnu_tree (gnat_obj))
1048 && (DECL_BY_COMPONENT_PTR_P
1049 (get_gnu_tree (gnat_obj))))))
1050 ? By_Reference : By_Copy);
1051 gnu_result = convert (gnu_result_type, size_int (- code));
1056 /* Say we have an unimplemented attribute. Then set the value to be
1057 returned to be a zero and hope that's something we can convert to the
1058 type of this attribute. */
1059 post_error ("unimplemented attribute", gnat_node);
1060 gnu_result_type = get_unpadded_type (Etype (gnat_node));
1061 gnu_result = integer_zero_node;
1065 /* If this is an attribute where the prefix was unused, force a use of it if
1066 it has a side-effect. But don't do it if the prefix is just an entity
1067 name. However, if an access check is needed, we must do it. See second
1068 example in AARM 11.6(5.e). */
1069 if (prefix_unused && TREE_SIDE_EFFECTS (gnu_prefix)
1070 && !Is_Entity_Name (Prefix (gnat_node)))
1071 gnu_result = fold (build2 (COMPOUND_EXPR, TREE_TYPE (gnu_result),
1072 gnu_prefix, gnu_result));
1074 *gnu_result_type_p = gnu_result_type;
1078 /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Case_Statement,
1079 to a GCC tree, which is returned. */
1082 Case_Statement_to_gnu (Node_Id gnat_node)
1088 gnu_expr = gnat_to_gnu (Expression (gnat_node));
1089 gnu_expr = convert (get_base_type (TREE_TYPE (gnu_expr)), gnu_expr);
1091 /* The range of values in a case statement is determined by the rules in
1092 RM 5.4(7-9). In almost all cases, this range is represented by the Etype
1093 of the expression. One exception arises in the case of a simple name that
1094 is parenthesized. This still has the Etype of the name, but since it is
1095 not a name, para 7 does not apply, and we need to go to the base type.
1096 This is the only case where parenthesization affects the dynamic
1097 semantics (i.e. the range of possible values at runtime that is covered
1098 by the others alternative.
1100 Another exception is if the subtype of the expression is non-static. In
1101 that case, we also have to use the base type. */
1102 if (Paren_Count (Expression (gnat_node)) != 0
1103 || !Is_OK_Static_Subtype (Underlying_Type
1104 (Etype (Expression (gnat_node)))))
1105 gnu_expr = convert (get_base_type (TREE_TYPE (gnu_expr)), gnu_expr);
1107 /* We build a SWITCH_EXPR that contains the code with interspersed
1108 CASE_LABEL_EXPRs for each label. */
1110 push_stack (&gnu_switch_label_stack, NULL_TREE, create_artificial_label ());
1111 start_stmt_group ();
1112 for (gnat_when = First_Non_Pragma (Alternatives (gnat_node));
1113 Present (gnat_when);
1114 gnat_when = Next_Non_Pragma (gnat_when))
1116 Node_Id gnat_choice;
1118 /* First compile all the different case choices for the current WHEN
1120 for (gnat_choice = First (Discrete_Choices (gnat_when));
1121 Present (gnat_choice); gnat_choice = Next (gnat_choice))
1123 tree gnu_low = NULL_TREE, gnu_high = NULL_TREE;
1125 switch (Nkind (gnat_choice))
1128 gnu_low = gnat_to_gnu (Low_Bound (gnat_choice));
1129 gnu_high = gnat_to_gnu (High_Bound (gnat_choice));
1132 case N_Subtype_Indication:
1133 gnu_low = gnat_to_gnu (Low_Bound (Range_Expression
1134 (Constraint (gnat_choice))));
1135 gnu_high = gnat_to_gnu (High_Bound (Range_Expression
1136 (Constraint (gnat_choice))));
1140 case N_Expanded_Name:
1141 /* This represents either a subtype range or a static value of
1142 some kind; Ekind says which. If a static value, fall through
1143 to the next case. */
1144 if (IN (Ekind (Entity (gnat_choice)), Type_Kind))
1146 tree gnu_type = get_unpadded_type (Entity (gnat_choice));
1148 gnu_low = fold (TYPE_MIN_VALUE (gnu_type));
1149 gnu_high = fold (TYPE_MAX_VALUE (gnu_type));
1153 /* ... fall through ... */
1155 case N_Character_Literal:
1156 case N_Integer_Literal:
1157 gnu_low = gnat_to_gnu (gnat_choice);
1160 case N_Others_Choice:
1167 add_stmt_with_node (build3 (CASE_LABEL_EXPR, void_type_node,
1169 create_artificial_label ()),
1173 /* Push a binding level here in case variables are declared since we want
1174 them to be local to this set of statements instead of the block
1175 containing the Case statement. */
1176 add_stmt (build_stmt_group (Statements (gnat_when), true));
1177 add_stmt (build1 (GOTO_EXPR, void_type_node,
1178 TREE_VALUE (gnu_switch_label_stack)));
1181 /* Now emit a definition of the label all the cases branched to. */
1182 add_stmt (build1 (LABEL_EXPR, void_type_node,
1183 TREE_VALUE (gnu_switch_label_stack)));
1184 gnu_result = build3 (SWITCH_EXPR, TREE_TYPE (gnu_expr), gnu_expr,
1185 end_stmt_group (), NULL_TREE);
1186 pop_stack (&gnu_switch_label_stack);
1191 /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Loop_Statement,
1192 to a GCC tree, which is returned. */
1195 Loop_Statement_to_gnu (Node_Id gnat_node)
1197 /* ??? It would be nice to use "build" here, but there's no build5. */
1198 tree gnu_loop_stmt = build_nt (LOOP_STMT, NULL_TREE, NULL_TREE,
1199 NULL_TREE, NULL_TREE, NULL_TREE);
1200 tree gnu_loop_var = NULL_TREE;
1201 Node_Id gnat_iter_scheme = Iteration_Scheme (gnat_node);
1202 tree gnu_cond_expr = NULL_TREE;
1205 TREE_TYPE (gnu_loop_stmt) = void_type_node;
1206 TREE_SIDE_EFFECTS (gnu_loop_stmt) = 1;
1207 LOOP_STMT_LABEL (gnu_loop_stmt) = create_artificial_label ();
1208 annotate_with_node (gnu_loop_stmt, gnat_node);
1210 /* Save the end label of this LOOP_STMT in a stack so that the corresponding
1211 N_Exit_Statement can find it. */
1212 push_stack (&gnu_loop_label_stack, NULL_TREE,
1213 LOOP_STMT_LABEL (gnu_loop_stmt));
1215 /* Set the condition that under which the loop should continue.
1216 For "LOOP .... END LOOP;" the condition is always true. */
1217 if (No (gnat_iter_scheme))
1219 /* The case "WHILE condition LOOP ..... END LOOP;" */
1220 else if (Present (Condition (gnat_iter_scheme)))
1221 LOOP_STMT_TOP_COND (gnu_loop_stmt)
1222 = gnat_to_gnu (Condition (gnat_iter_scheme));
1225 /* We have an iteration scheme. */
1226 Node_Id gnat_loop_spec = Loop_Parameter_Specification (gnat_iter_scheme);
1227 Entity_Id gnat_loop_var = Defining_Entity (gnat_loop_spec);
1228 Entity_Id gnat_type = Etype (gnat_loop_var);
1229 tree gnu_type = get_unpadded_type (gnat_type);
1230 tree gnu_low = TYPE_MIN_VALUE (gnu_type);
1231 tree gnu_high = TYPE_MAX_VALUE (gnu_type);
1232 bool reversep = Reverse_Present (gnat_loop_spec);
1233 tree gnu_first = reversep ? gnu_high : gnu_low;
1234 tree gnu_last = reversep ? gnu_low : gnu_high;
1235 enum tree_code end_code = reversep ? GE_EXPR : LE_EXPR;
1236 tree gnu_base_type = get_base_type (gnu_type);
1237 tree gnu_limit = (reversep ? TYPE_MIN_VALUE (gnu_base_type)
1238 : TYPE_MAX_VALUE (gnu_base_type));
1240 /* We know the loop variable will not overflow if GNU_LAST is a constant
1241 and is not equal to GNU_LIMIT. If it might overflow, we have to move
1242 the limit test to the end of the loop. In that case, we have to test
1243 for an empty loop outside the loop. */
1244 if (TREE_CODE (gnu_last) != INTEGER_CST
1245 || TREE_CODE (gnu_limit) != INTEGER_CST
1246 || tree_int_cst_equal (gnu_last, gnu_limit))
1249 = build3 (COND_EXPR, void_type_node,
1250 build_binary_op (LE_EXPR, integer_type_node,
1252 NULL_TREE, alloc_stmt_list ());
1253 annotate_with_node (gnu_cond_expr, gnat_loop_spec);
1256 /* Open a new nesting level that will surround the loop to declare the
1257 loop index variable. */
1258 start_stmt_group ();
1261 /* Declare the loop index and set it to its initial value. */
1262 gnu_loop_var = gnat_to_gnu_entity (gnat_loop_var, gnu_first, 1);
1263 if (DECL_BY_REF_P (gnu_loop_var))
1264 gnu_loop_var = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_loop_var);
1266 /* The loop variable might be a padded type, so use `convert' to get a
1267 reference to the inner variable if so. */
1268 gnu_loop_var = convert (get_base_type (gnu_type), gnu_loop_var);
1270 /* Set either the top or bottom exit condition as appropriate depending
1271 on whether or not we know an overflow cannot occur. */
1273 LOOP_STMT_BOT_COND (gnu_loop_stmt)
1274 = build_binary_op (NE_EXPR, integer_type_node,
1275 gnu_loop_var, gnu_last);
1277 LOOP_STMT_TOP_COND (gnu_loop_stmt)
1278 = build_binary_op (end_code, integer_type_node,
1279 gnu_loop_var, gnu_last);
1281 LOOP_STMT_UPDATE (gnu_loop_stmt)
1282 = build_binary_op (reversep ? PREDECREMENT_EXPR
1283 : PREINCREMENT_EXPR,
1284 TREE_TYPE (gnu_loop_var),
1286 convert (TREE_TYPE (gnu_loop_var),
1288 annotate_with_node (LOOP_STMT_UPDATE (gnu_loop_stmt),
1292 /* If the loop was named, have the name point to this loop. In this case,
1293 the association is not a ..._DECL node, but the end label from this
1295 if (Present (Identifier (gnat_node)))
1296 save_gnu_tree (Entity (Identifier (gnat_node)),
1297 LOOP_STMT_LABEL (gnu_loop_stmt), true);
1299 /* Make the loop body into its own block, so any allocated storage will be
1300 released every iteration. This is needed for stack allocation. */
1301 LOOP_STMT_BODY (gnu_loop_stmt)
1302 = build_stmt_group (Statements (gnat_node), true);
1304 /* If we declared a variable, then we are in a statement group for that
1305 declaration. Add the LOOP_STMT to it and make that the "loop". */
1308 add_stmt (gnu_loop_stmt);
1310 gnu_loop_stmt = end_stmt_group ();
1313 /* If we have an outer COND_EXPR, that's our result and this loop is its
1314 "true" statement. Otherwise, the result is the LOOP_STMT. */
1317 COND_EXPR_THEN (gnu_cond_expr) = gnu_loop_stmt;
1318 gnu_result = gnu_cond_expr;
1319 recalculate_side_effects (gnu_cond_expr);
1322 gnu_result = gnu_loop_stmt;
1324 pop_stack (&gnu_loop_label_stack);
1329 /* Subroutine of gnat_to_gnu to process gnat_node, an N_Subprogram_Body. We
1330 don't return anything. */
1333 Subprogram_Body_to_gnu (Node_Id gnat_node)
1335 /* Save debug output mode in case it is reset. */
1336 enum debug_info_type save_write_symbols = write_symbols;
1337 const struct gcc_debug_hooks *const save_debug_hooks = debug_hooks;
1338 /* Defining identifier of a parameter to the subprogram. */
1339 Entity_Id gnat_param;
1340 /* The defining identifier for the subprogram body. Note that if a
1341 specification has appeared before for this body, then the identifier
1342 occurring in that specification will also be a defining identifier and all
1343 the calls to this subprogram will point to that specification. */
1344 Entity_Id gnat_subprog_id
1345 = (Present (Corresponding_Spec (gnat_node))
1346 ? Corresponding_Spec (gnat_node) : Defining_Entity (gnat_node));
1347 /* The FUNCTION_DECL node corresponding to the subprogram spec. */
1348 tree gnu_subprog_decl;
1349 /* The FUNCTION_TYPE node corresponding to the subprogram spec. */
1350 tree gnu_subprog_type;
1354 /* If this is a generic object or if it has been eliminated,
1356 if (Ekind (gnat_subprog_id) == E_Generic_Procedure
1357 || Ekind (gnat_subprog_id) == E_Generic_Function
1358 || Is_Eliminated (gnat_subprog_id))
1361 /* If debug information is suppressed for the subprogram, turn debug
1362 mode off for the duration of processing. */
1363 if (!Needs_Debug_Info (gnat_subprog_id))
1365 write_symbols = NO_DEBUG;
1366 debug_hooks = &do_nothing_debug_hooks;
1369 /* If this subprogram acts as its own spec, define it. Otherwise, just get
1370 the already-elaborated tree node. However, if this subprogram had its
1371 elaboration deferred, we will already have made a tree node for it. So
1372 treat it as not being defined in that case. Such a subprogram cannot
1373 have an address clause or a freeze node, so this test is safe, though it
1374 does disable some otherwise-useful error checking. */
1376 = gnat_to_gnu_entity (gnat_subprog_id, NULL_TREE,
1377 Acts_As_Spec (gnat_node)
1378 && !present_gnu_tree (gnat_subprog_id));
1380 gnu_subprog_type = TREE_TYPE (gnu_subprog_decl);
1382 /* Set the line number in the decl to correspond to that of the body so that
1383 the line number notes are written
1385 Sloc_to_locus (Sloc (gnat_node), &DECL_SOURCE_LOCATION (gnu_subprog_decl));
1387 begin_subprog_body (gnu_subprog_decl);
1388 gnu_cico_list = TYPE_CI_CO_LIST (gnu_subprog_type);
1390 /* If there are OUT parameters, we need to ensure that the return statement
1391 properly copies them out. We do this by making a new block and converting
1392 any inner return into a goto to a label at the end of the block. */
1393 push_stack (&gnu_return_label_stack, NULL_TREE,
1394 gnu_cico_list ? create_artificial_label () : NULL_TREE);
1396 /* Get a tree corresponding to the code for the subprogram. */
1397 start_stmt_group ();
1400 /* See if there are any parameters for which we don't yet have GCC entities.
1401 These must be for OUT parameters for which we will be making VAR_DECL
1402 nodes here. Fill them in to TYPE_CI_CO_LIST, which must contain the empty
1403 entry as well. We can match up the entries because TYPE_CI_CO_LIST is in
1404 the order of the parameters. */
1405 for (gnat_param = First_Formal (gnat_subprog_id);
1406 Present (gnat_param);
1407 gnat_param = Next_Formal_With_Extras (gnat_param))
1408 if (!present_gnu_tree (gnat_param))
1410 /* Skip any entries that have been already filled in; they must
1411 correspond to IN OUT parameters. */
1412 for (; gnu_cico_list && TREE_VALUE (gnu_cico_list);
1413 gnu_cico_list = TREE_CHAIN (gnu_cico_list))
1416 /* Do any needed references for padded types. */
1417 TREE_VALUE (gnu_cico_list)
1418 = convert (TREE_TYPE (TREE_PURPOSE (gnu_cico_list)),
1419 gnat_to_gnu_entity (gnat_param, NULL_TREE, 1));
1422 process_decls (Declarations (gnat_node), Empty, Empty, true, true);
1424 /* Generate the code of the subprogram itself. A return statement will be
1425 present and any OUT parameters will be handled there. */
1426 add_stmt (gnat_to_gnu (Handled_Statement_Sequence (gnat_node)));
1428 gnu_result = end_stmt_group ();
1430 /* If we made a special return label, we need to make a block that contains
1431 the definition of that label and the copying to the return value. That
1432 block first contains the function, then the label and copy statement. */
1433 if (TREE_VALUE (gnu_return_label_stack))
1437 start_stmt_group ();
1439 add_stmt (gnu_result);
1440 add_stmt (build1 (LABEL_EXPR, void_type_node,
1441 TREE_VALUE (gnu_return_label_stack)));
1443 gnu_cico_list = TYPE_CI_CO_LIST (gnu_subprog_type);
1444 if (list_length (gnu_cico_list) == 1)
1445 gnu_retval = TREE_VALUE (gnu_cico_list);
1447 gnu_retval = gnat_build_constructor (TREE_TYPE (gnu_subprog_type),
1450 if (DECL_P (gnu_retval) && DECL_BY_REF_P (gnu_retval))
1451 gnu_retval = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_retval);
1454 (build1 (RETURN_EXPR, void_type_node,
1455 build2 (MODIFY_EXPR, TREE_TYPE (gnu_retval),
1456 DECL_RESULT (current_function_decl), gnu_retval)),
1459 gnu_result = end_stmt_group ();
1462 pop_stack (&gnu_return_label_stack);
1464 /* Initialize the information node for the function and set the
1466 allocate_struct_function (current_function_decl);
1468 ((Present (End_Label (Handled_Statement_Sequence (gnat_node)))
1469 ? Sloc (End_Label (Handled_Statement_Sequence (gnat_node)))
1470 : Sloc (gnat_node)),
1471 &cfun->function_end_locus);
1473 end_subprog_body (gnu_result);
1475 /* Disconnect the trees for parameters that we made variables for from the
1476 GNAT entities since these are unusable after we end the function. */
1477 for (gnat_param = First_Formal (gnat_subprog_id);
1478 Present (gnat_param);
1479 gnat_param = Next_Formal_With_Extras (gnat_param))
1480 if (TREE_CODE (get_gnu_tree (gnat_param)) == VAR_DECL)
1481 save_gnu_tree (gnat_param, NULL_TREE, false);
1483 mark_out_of_scope (Defining_Unit_Name (Specification (gnat_node)));
1484 write_symbols = save_write_symbols;
1485 debug_hooks = save_debug_hooks;
1488 /* Subroutine of gnat_to_gnu to translate gnat_node, either an N_Function_Call
1489 or an N_Procedure_Call_Statement, to a GCC tree, which is returned.
1490 GNU_RESULT_TYPE_P is a pointer to where we should place the result type.
1491 If GNU_TARGET is non-null, this must be a function call and the result
1492 of the call is to be placed into that object. */
1495 call_to_gnu (Node_Id gnat_node, tree *gnu_result_type_p, tree gnu_target)
1498 /* The GCC node corresponding to the GNAT subprogram name. This can either
1499 be a FUNCTION_DECL node if we are dealing with a standard subprogram call,
1500 or an indirect reference expression (an INDIRECT_REF node) pointing to a
1502 tree gnu_subprog_node = gnat_to_gnu (Name (gnat_node));
1503 /* The FUNCTION_TYPE node giving the GCC type of the subprogram. */
1504 tree gnu_subprog_type = TREE_TYPE (gnu_subprog_node);
1505 tree gnu_subprog_addr = build_unary_op (ADDR_EXPR, NULL_TREE,
1507 Entity_Id gnat_formal;
1508 Node_Id gnat_actual;
1509 tree gnu_actual_list = NULL_TREE;
1510 tree gnu_name_list = NULL_TREE;
1511 tree gnu_before_list = NULL_TREE;
1512 tree gnu_after_list = NULL_TREE;
1513 tree gnu_subprog_call;
1515 switch (Nkind (Name (gnat_node)))
1518 case N_Operator_Symbol:
1519 case N_Expanded_Name:
1520 case N_Attribute_Reference:
1521 if (Is_Eliminated (Entity (Name (gnat_node))))
1522 Eliminate_Error_Msg (gnat_node, Entity (Name (gnat_node)));
1525 gcc_assert (TREE_CODE (gnu_subprog_type) == FUNCTION_TYPE);
1527 /* If we are calling a stubbed function, make this into a raise of
1528 Program_Error. Elaborate all our args first. */
1529 if (TREE_CODE (gnu_subprog_node) == FUNCTION_DECL
1530 && DECL_STUBBED_P (gnu_subprog_node))
1532 for (gnat_actual = First_Actual (gnat_node);
1533 Present (gnat_actual);
1534 gnat_actual = Next_Actual (gnat_actual))
1535 add_stmt (gnat_to_gnu (gnat_actual));
1537 if (Nkind (gnat_node) == N_Function_Call && !gnu_target)
1539 *gnu_result_type_p = TREE_TYPE (gnu_subprog_type);
1540 return build1 (NULL_EXPR, *gnu_result_type_p,
1541 build_call_raise (PE_Stubbed_Subprogram_Called));
1544 return build_call_raise (PE_Stubbed_Subprogram_Called);
1547 /* If we are calling by supplying a pointer to a target, set up that
1548 pointer as the first argument. Use GNU_TARGET if one was passed;
1549 otherwise, make a target by building a variable of the maximum size
1551 if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type))
1553 tree gnu_real_ret_type
1554 = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (gnu_subprog_type)));
1559 = maybe_pad_type (gnu_real_ret_type,
1560 max_size (TYPE_SIZE (gnu_real_ret_type), true),
1561 0, Etype (Name (gnat_node)), "PAD", false,
1564 gnu_target = create_tmp_var_raw (gnu_obj_type, "LR");
1565 gnat_pushdecl (gnu_target, gnat_node);
1569 = tree_cons (NULL_TREE,
1570 build_unary_op (ADDR_EXPR, NULL_TREE,
1571 unchecked_convert (gnu_real_ret_type,
1578 /* The only way we can be making a call via an access type is if Name is an
1579 explicit dereference. In that case, get the list of formal args from the
1580 type the access type is pointing to. Otherwise, get the formals from
1581 entity being called. */
1582 if (Nkind (Name (gnat_node)) == N_Explicit_Dereference)
1583 gnat_formal = First_Formal (Etype (Name (gnat_node)));
1584 else if (Nkind (Name (gnat_node)) == N_Attribute_Reference)
1585 /* Assume here that this must be 'Elab_Body or 'Elab_Spec. */
1588 gnat_formal = First_Formal (Entity (Name (gnat_node)));
1590 /* Create the list of the actual parameters as GCC expects it, namely a chain
1591 of TREE_LIST nodes in which the TREE_VALUE field of each node is a
1592 parameter-expression and the TREE_PURPOSE field is null. Skip OUT
1593 parameters not passed by reference and don't need to be copied in. */
1594 for (gnat_actual = First_Actual (gnat_node);
1595 Present (gnat_actual);
1596 gnat_formal = Next_Formal_With_Extras (gnat_formal),
1597 gnat_actual = Next_Actual (gnat_actual))
1600 = (present_gnu_tree (gnat_formal)
1601 ? get_gnu_tree (gnat_formal) : NULL_TREE);
1602 /* We treat a conversion between aggregate types as if it is an
1603 unchecked conversion. */
1604 bool unchecked_convert_p
1605 = (Nkind (gnat_actual) == N_Unchecked_Type_Conversion
1606 || (Nkind (gnat_actual) == N_Type_Conversion
1607 && Is_Composite_Type (Underlying_Type (Etype (gnat_formal)))));
1608 Node_Id gnat_name = (unchecked_convert_p
1609 ? Expression (gnat_actual) : gnat_actual);
1610 tree gnu_name = gnat_to_gnu (gnat_name);
1611 tree gnu_name_type = gnat_to_gnu_type (Etype (gnat_name));
1613 tree gnu_formal_type;
1615 /* If it's possible we may need to use this expression twice, make sure
1616 than any side-effects are handled via SAVE_EXPRs. Likewise if we need
1617 to force side-effects before the call.
1619 ??? This is more conservative than we need since we don't need to do
1620 this for pass-by-ref with no conversion. If we are passing a
1621 non-addressable Out or In Out parameter by reference, pass the address
1622 of a copy and set up to copy back out after the call. */
1623 if (Ekind (gnat_formal) != E_In_Parameter)
1625 gnu_name = gnat_stabilize_reference (gnu_name, true);
1626 if (!addressable_p (gnu_name)
1628 && (DECL_BY_REF_P (gnu_formal)
1629 || (TREE_CODE (gnu_formal) == PARM_DECL
1630 && (DECL_BY_COMPONENT_PTR_P (gnu_formal)
1631 || (DECL_BY_DESCRIPTOR_P (gnu_formal))))))
1633 tree gnu_copy = gnu_name;
1636 /* Remove any unpadding on the actual and make a copy. But if
1637 the actual is a justified modular type, first convert
1639 if (TREE_CODE (gnu_name) == COMPONENT_REF
1640 && ((TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_name, 0)))
1642 && (TYPE_IS_PADDING_P
1643 (TREE_TYPE (TREE_OPERAND (gnu_name, 0))))))
1644 gnu_name = gnu_copy = TREE_OPERAND (gnu_name, 0);
1645 else if (TREE_CODE (gnu_name_type) == RECORD_TYPE
1646 && (TYPE_JUSTIFIED_MODULAR_P (gnu_name_type)))
1647 gnu_name = convert (gnu_name_type, gnu_name);
1649 gnu_actual = save_expr (gnu_name);
1651 /* Since we're going to take the address of the SAVE_EXPR, we
1652 don't want it to be marked as unchanging. So set
1653 TREE_ADDRESSABLE. */
1654 gnu_temp = skip_simple_arithmetic (gnu_actual);
1655 if (TREE_CODE (gnu_temp) == SAVE_EXPR)
1657 TREE_ADDRESSABLE (gnu_temp) = 1;
1658 TREE_READONLY (gnu_temp) = 0;
1661 /* Set up to move the copy back to the original. */
1662 gnu_temp = build2 (MODIFY_EXPR, TREE_TYPE (gnu_copy),
1663 gnu_copy, gnu_actual);
1664 annotate_with_node (gnu_temp, gnat_actual);
1665 append_to_statement_list (gnu_temp, &gnu_after_list);
1669 /* If this was a procedure call, we may not have removed any padding.
1670 So do it here for the part we will use as an input, if any. */
1671 gnu_actual = gnu_name;
1672 if (Ekind (gnat_formal) != E_Out_Parameter
1673 && TREE_CODE (TREE_TYPE (gnu_actual)) == RECORD_TYPE
1674 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_actual)))
1675 gnu_actual = convert (get_unpadded_type (Etype (gnat_actual)),
1678 /* Unless this is an In parameter, we must remove any LJM building
1680 if (Ekind (gnat_formal) != E_In_Parameter
1681 && TREE_CODE (gnu_name) == CONSTRUCTOR
1682 && TREE_CODE (TREE_TYPE (gnu_name)) == RECORD_TYPE
1683 && TYPE_JUSTIFIED_MODULAR_P (TREE_TYPE (gnu_name)))
1684 gnu_name = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_name))),
1687 if (Ekind (gnat_formal) != E_Out_Parameter
1688 && !unchecked_convert_p
1689 && Do_Range_Check (gnat_actual))
1690 gnu_actual = emit_range_check (gnu_actual, Etype (gnat_formal));
1692 /* Do any needed conversions. We need only check for unchecked
1693 conversion since normal conversions will be handled by just
1694 converting to the formal type. */
1695 if (unchecked_convert_p)
1698 = unchecked_convert (gnat_to_gnu_type (Etype (gnat_actual)),
1700 (Nkind (gnat_actual)
1701 == N_Unchecked_Type_Conversion)
1702 && No_Truncation (gnat_actual));
1704 /* One we've done the unchecked conversion, we still must ensure that
1705 the object is in range of the formal's type. */
1706 if (Ekind (gnat_formal) != E_Out_Parameter
1707 && Do_Range_Check (gnat_actual))
1708 gnu_actual = emit_range_check (gnu_actual,
1709 Etype (gnat_formal));
1711 else if (TREE_CODE (gnu_actual) != SAVE_EXPR)
1712 /* We may have suppressed a conversion to the Etype of the actual since
1713 the parent is a procedure call. So add the conversion here. */
1714 gnu_actual = convert (gnat_to_gnu_type (Etype (gnat_actual)),
1717 /* If we have not saved a GCC object for the formal, it means it is an
1718 OUT parameter not passed by reference and that does not need to be
1719 copied in. Otherwise, look at the PARM_DECL to see if it is passed by
1722 && TREE_CODE (gnu_formal) == PARM_DECL && DECL_BY_REF_P (gnu_formal))
1724 if (Ekind (gnat_formal) != E_In_Parameter)
1726 gnu_actual = gnu_name;
1728 /* If we have a padded type, be sure we've removed padding. */
1729 if (TREE_CODE (TREE_TYPE (gnu_actual)) == RECORD_TYPE
1730 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_actual))
1731 && TREE_CODE (gnu_actual) != SAVE_EXPR)
1732 gnu_actual = convert (get_unpadded_type (Etype (gnat_actual)),
1735 /* If we have the constructed subtype of an aliased object
1736 with an unconstrained nominal subtype, the type of the
1737 actual includes the template, although it is formally
1738 constrained. So we need to convert it back to the real
1739 constructed subtype to retrieve the constrained part
1740 and takes its address. */
1741 if (TREE_CODE (TREE_TYPE (gnu_actual)) == RECORD_TYPE
1742 && TYPE_CONTAINS_TEMPLATE_P (TREE_TYPE (gnu_actual))
1743 && TREE_CODE (gnu_actual) != SAVE_EXPR
1744 && Is_Constr_Subt_For_UN_Aliased (Etype (gnat_actual))
1745 && Is_Array_Type (Etype (gnat_actual)))
1746 gnu_actual = convert (gnat_to_gnu_type (Etype (gnat_actual)),
1750 /* Otherwise, if we have a non-addressable COMPONENT_REF of a
1751 variable-size type see if it's doing a unpadding operation. If
1752 so, remove that operation since we have no way of allocating the
1753 required temporary. */
1754 if (TREE_CODE (gnu_actual) == COMPONENT_REF
1755 && !TREE_CONSTANT (TYPE_SIZE (TREE_TYPE (gnu_actual)))
1756 && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_actual, 0)))
1758 && TYPE_IS_PADDING_P (TREE_TYPE
1759 (TREE_OPERAND (gnu_actual, 0)))
1760 && !addressable_p (gnu_actual))
1761 gnu_actual = TREE_OPERAND (gnu_actual, 0);
1763 /* The symmetry of the paths to the type of an entity is broken here
1764 since arguments don't know that they will be passed by ref. */
1765 gnu_formal_type = TREE_TYPE (get_gnu_tree (gnat_formal));
1766 gnu_actual = build_unary_op (ADDR_EXPR, gnu_formal_type, gnu_actual);
1768 else if (gnu_formal && TREE_CODE (gnu_formal) == PARM_DECL
1769 && DECL_BY_COMPONENT_PTR_P (gnu_formal))
1771 gnu_formal_type = TREE_TYPE (get_gnu_tree (gnat_formal));
1772 gnu_actual = maybe_implicit_deref (gnu_actual);
1773 gnu_actual = maybe_unconstrained_array (gnu_actual);
1775 if (TREE_CODE (gnu_formal_type) == RECORD_TYPE
1776 && TYPE_IS_PADDING_P (gnu_formal_type))
1778 gnu_formal_type = TREE_TYPE (TYPE_FIELDS (gnu_formal_type));
1779 gnu_actual = convert (gnu_formal_type, gnu_actual);
1782 /* Take the address of the object and convert to the proper pointer
1783 type. We'd like to actually compute the address of the beginning
1784 of the array using an ADDR_EXPR of an ARRAY_REF, but there's a
1785 possibility that the ARRAY_REF might return a constant and we'd be
1786 getting the wrong address. Neither approach is exactly correct,
1787 but this is the most likely to work in all cases. */
1788 gnu_actual = convert (gnu_formal_type,
1789 build_unary_op (ADDR_EXPR, NULL_TREE,
1792 else if (gnu_formal && TREE_CODE (gnu_formal) == PARM_DECL
1793 && DECL_BY_DESCRIPTOR_P (gnu_formal))
1795 /* If arg is 'Null_Parameter, pass zero descriptor. */
1796 if ((TREE_CODE (gnu_actual) == INDIRECT_REF
1797 || TREE_CODE (gnu_actual) == UNCONSTRAINED_ARRAY_REF)
1798 && TREE_PRIVATE (gnu_actual))
1799 gnu_actual = convert (DECL_ARG_TYPE (get_gnu_tree (gnat_formal)),
1802 gnu_actual = build_unary_op (ADDR_EXPR, NULL_TREE,
1803 fill_vms_descriptor (gnu_actual,
1808 tree gnu_actual_size = TYPE_SIZE (TREE_TYPE (gnu_actual));
1810 if (Ekind (gnat_formal) != E_In_Parameter)
1811 gnu_name_list = tree_cons (NULL_TREE, gnu_name, gnu_name_list);
1813 if (!gnu_formal || TREE_CODE (gnu_formal) != PARM_DECL)
1816 /* If this is 'Null_Parameter, pass a zero even though we are
1817 dereferencing it. */
1818 else if (TREE_CODE (gnu_actual) == INDIRECT_REF
1819 && TREE_PRIVATE (gnu_actual)
1820 && host_integerp (gnu_actual_size, 1)
1821 && 0 >= compare_tree_int (gnu_actual_size,
1824 = unchecked_convert (DECL_ARG_TYPE (gnu_formal),
1825 convert (gnat_type_for_size
1826 (tree_low_cst (gnu_actual_size, 1),
1831 gnu_actual = convert (DECL_ARG_TYPE (gnu_formal), gnu_actual);
1834 gnu_actual_list = tree_cons (NULL_TREE, gnu_actual, gnu_actual_list);
1837 gnu_subprog_call = build3 (CALL_EXPR, TREE_TYPE (gnu_subprog_type),
1838 gnu_subprog_addr, nreverse (gnu_actual_list),
1841 /* If we return by passing a target, we emit the call and return the target
1843 if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type))
1845 add_stmt_with_node (gnu_subprog_call, gnat_node);
1847 = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (gnu_subprog_type)));
1848 return unchecked_convert (*gnu_result_type_p, gnu_target, false);
1851 /* If it is a function call, the result is the call expression unless
1852 a target is specified, in which case we copy the result into the target
1853 and return the assignment statement. */
1854 else if (Nkind (gnat_node) == N_Function_Call)
1856 gnu_result = gnu_subprog_call;
1858 /* If the function returns an unconstrained array or by reference,
1859 we have to de-dereference the pointer. */
1860 if (TYPE_RETURNS_UNCONSTRAINED_P (gnu_subprog_type)
1861 || TYPE_RETURNS_BY_REF_P (gnu_subprog_type))
1862 gnu_result = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_result);
1865 gnu_result = build_binary_op (MODIFY_EXPR, NULL_TREE,
1866 gnu_target, gnu_result);
1868 *gnu_result_type_p = get_unpadded_type (Etype (gnat_node));
1873 /* If this is the case where the GNAT tree contains a procedure call
1874 but the Ada procedure has copy in copy out parameters, the special
1875 parameter passing mechanism must be used. */
1876 else if (TYPE_CI_CO_LIST (gnu_subprog_type) != NULL_TREE)
1878 /* List of FIELD_DECLs associated with the PARM_DECLs of the copy
1879 in copy out parameters. */
1880 tree scalar_return_list = TYPE_CI_CO_LIST (gnu_subprog_type);
1881 int length = list_length (scalar_return_list);
1887 gnu_subprog_call = save_expr (gnu_subprog_call);
1888 gnu_name_list = nreverse (gnu_name_list);
1890 /* If any of the names had side-effects, ensure they are all
1891 evaluated before the call. */
1892 for (gnu_name = gnu_name_list; gnu_name;
1893 gnu_name = TREE_CHAIN (gnu_name))
1894 if (TREE_SIDE_EFFECTS (TREE_VALUE (gnu_name)))
1895 append_to_statement_list (TREE_VALUE (gnu_name),
1899 if (Nkind (Name (gnat_node)) == N_Explicit_Dereference)
1900 gnat_formal = First_Formal (Etype (Name (gnat_node)));
1902 gnat_formal = First_Formal (Entity (Name (gnat_node)));
1904 for (gnat_actual = First_Actual (gnat_node);
1905 Present (gnat_actual);
1906 gnat_formal = Next_Formal_With_Extras (gnat_formal),
1907 gnat_actual = Next_Actual (gnat_actual))
1908 /* If we are dealing with a copy in copy out parameter, we must
1909 retrieve its value from the record returned in the call. */
1910 if (!(present_gnu_tree (gnat_formal)
1911 && TREE_CODE (get_gnu_tree (gnat_formal)) == PARM_DECL
1912 && (DECL_BY_REF_P (get_gnu_tree (gnat_formal))
1913 || (TREE_CODE (get_gnu_tree (gnat_formal)) == PARM_DECL
1914 && ((DECL_BY_COMPONENT_PTR_P (get_gnu_tree (gnat_formal))
1915 || (DECL_BY_DESCRIPTOR_P
1916 (get_gnu_tree (gnat_formal))))))))
1917 && Ekind (gnat_formal) != E_In_Parameter)
1919 /* Get the value to assign to this OUT or IN OUT parameter. It is
1920 either the result of the function if there is only a single such
1921 parameter or the appropriate field from the record returned. */
1923 = length == 1 ? gnu_subprog_call
1924 : build_component_ref (gnu_subprog_call, NULL_TREE,
1925 TREE_PURPOSE (scalar_return_list),
1927 bool unchecked_conversion = (Nkind (gnat_actual)
1928 == N_Unchecked_Type_Conversion);
1929 /* If the actual is a conversion, get the inner expression, which
1930 will be the real destination, and convert the result to the
1931 type of the actual parameter. */
1933 = maybe_unconstrained_array (TREE_VALUE (gnu_name_list));
1935 /* If the result is a padded type, remove the padding. */
1936 if (TREE_CODE (TREE_TYPE (gnu_result)) == RECORD_TYPE
1937 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_result)))
1938 gnu_result = convert (TREE_TYPE (TYPE_FIELDS
1939 (TREE_TYPE (gnu_result))),
1942 /* If the result is a type conversion, do it. */
1943 if (Nkind (gnat_actual) == N_Type_Conversion)
1945 = convert_with_check
1946 (Etype (Expression (gnat_actual)), gnu_result,
1947 Do_Overflow_Check (gnat_actual),
1948 Do_Range_Check (Expression (gnat_actual)),
1949 Float_Truncate (gnat_actual));
1951 else if (unchecked_conversion)
1952 gnu_result = unchecked_convert (TREE_TYPE (gnu_actual),
1954 No_Truncation (gnat_actual));
1957 if (Do_Range_Check (gnat_actual))
1958 gnu_result = emit_range_check (gnu_result,
1959 Etype (gnat_actual));
1961 if (!(!TREE_CONSTANT (TYPE_SIZE (TREE_TYPE (gnu_actual)))
1962 && TREE_CONSTANT (TYPE_SIZE (TREE_TYPE (gnu_result)))))
1963 gnu_result = convert (TREE_TYPE (gnu_actual), gnu_result);
1966 gnu_result = build_binary_op (MODIFY_EXPR, NULL_TREE,
1967 gnu_actual, gnu_result);
1968 annotate_with_node (gnu_result, gnat_actual);
1969 append_to_statement_list (gnu_result, &gnu_before_list);
1970 scalar_return_list = TREE_CHAIN (scalar_return_list);
1971 gnu_name_list = TREE_CHAIN (gnu_name_list);
1976 annotate_with_node (gnu_subprog_call, gnat_node);
1977 append_to_statement_list (gnu_subprog_call, &gnu_before_list);
1980 append_to_statement_list (gnu_after_list, &gnu_before_list);
1981 return gnu_before_list;
1984 /* Subroutine of gnat_to_gnu to translate gnat_node, an
1985 N_Handled_Sequence_Of_Statements, to a GCC tree, which is returned. */
1988 Handled_Sequence_Of_Statements_to_gnu (Node_Id gnat_node)
1990 tree gnu_jmpsave_decl = NULL_TREE;
1991 tree gnu_jmpbuf_decl = NULL_TREE;
1992 /* If just annotating, ignore all EH and cleanups. */
1993 bool gcc_zcx = (!type_annotate_only
1994 && Present (Exception_Handlers (gnat_node))
1995 && Exception_Mechanism == GCC_ZCX);
1997 = (!type_annotate_only && Present (Exception_Handlers (gnat_node))
1998 && Exception_Mechanism == Setjmp_Longjmp);
1999 bool at_end = !type_annotate_only && Present (At_End_Proc (gnat_node));
2000 bool binding_for_block = (at_end || gcc_zcx || setjmp_longjmp);
2001 tree gnu_inner_block; /* The statement(s) for the block itself. */
2006 /* The GCC exception handling mechanism can handle both ZCX and SJLJ schemes
2007 and we have our own SJLJ mechanism. To call the GCC mechanism, we call
2008 add_cleanup, and when we leave the binding, end_stmt_group will create
2009 the TRY_FINALLY_EXPR.
2011 ??? The region level calls down there have been specifically put in place
2012 for a ZCX context and currently the order in which things are emitted
2013 (region/handlers) is different from the SJLJ case. Instead of putting
2014 other calls with different conditions at other places for the SJLJ case,
2015 it seems cleaner to reorder things for the SJLJ case and generalize the
2016 condition to make it not ZCX specific.
2018 If there are any exceptions or cleanup processing involved, we need an
2019 outer statement group (for Setjmp_Longjmp) and binding level. */
2020 if (binding_for_block)
2022 start_stmt_group ();
2026 /* If we are to call a function when exiting this block add a cleanup
2027 to the binding level we made above. */
2029 add_cleanup (build_call_0_expr (gnat_to_gnu (At_End_Proc (gnat_node))));
2031 /* If using setjmp_longjmp, make the variables for the setjmp buffer and save
2032 area for address of previous buffer. Do this first since we need to have
2033 the setjmp buf known for any decls in this block. */
2036 gnu_jmpsave_decl = create_var_decl (get_identifier ("JMPBUF_SAVE"),
2037 NULL_TREE, jmpbuf_ptr_type,
2038 build_call_0_expr (get_jmpbuf_decl),
2039 false, false, false, false, NULL,
2041 gnu_jmpbuf_decl = create_var_decl (get_identifier ("JMP_BUF"),
2042 NULL_TREE, jmpbuf_type,
2043 NULL_TREE, false, false, false, false,
2046 set_block_jmpbuf_decl (gnu_jmpbuf_decl);
2048 /* When we exit this block, restore the saved value. */
2049 add_cleanup (build_call_1_expr (set_jmpbuf_decl, gnu_jmpsave_decl));
2052 /* Now build the tree for the declarations and statements inside this block.
2053 If this is SJLJ, set our jmp_buf as the current buffer. */
2054 start_stmt_group ();
2057 add_stmt (build_call_1_expr (set_jmpbuf_decl,
2058 build_unary_op (ADDR_EXPR, NULL_TREE,
2061 if (Present (First_Real_Statement (gnat_node)))
2062 process_decls (Statements (gnat_node), Empty,
2063 First_Real_Statement (gnat_node), true, true);
2065 /* Generate code for each statement in the block. */
2066 for (gnat_temp = (Present (First_Real_Statement (gnat_node))
2067 ? First_Real_Statement (gnat_node)
2068 : First (Statements (gnat_node)));
2069 Present (gnat_temp); gnat_temp = Next (gnat_temp))
2070 add_stmt (gnat_to_gnu (gnat_temp));
2071 gnu_inner_block = end_stmt_group ();
2073 /* Now generate code for the two exception models, if either is relevant for
2077 tree *gnu_else_ptr = 0;
2080 /* Make a binding level for the exception handling declarations and code
2081 and set up gnu_except_ptr_stack for the handlers to use. */
2082 start_stmt_group ();
2085 push_stack (&gnu_except_ptr_stack, NULL_TREE,
2086 create_var_decl (get_identifier ("EXCEPT_PTR"),
2088 build_pointer_type (except_type_node),
2089 build_call_0_expr (get_excptr_decl), false,
2090 false, false, false, NULL, gnat_node));
2092 /* Generate code for each handler. The N_Exception_Handler case does the
2093 real work and returns a COND_EXPR for each handler, which we chain
2095 for (gnat_temp = First_Non_Pragma (Exception_Handlers (gnat_node));
2096 Present (gnat_temp); gnat_temp = Next_Non_Pragma (gnat_temp))
2098 gnu_expr = gnat_to_gnu (gnat_temp);
2100 /* If this is the first one, set it as the outer one. Otherwise,
2101 point the "else" part of the previous handler to us. Then point
2102 to our "else" part. */
2104 add_stmt (gnu_expr);
2106 *gnu_else_ptr = gnu_expr;
2108 gnu_else_ptr = &COND_EXPR_ELSE (gnu_expr);
2111 /* If none of the exception handlers did anything, re-raise but do not
2113 gnu_expr = build_call_1_expr (raise_nodefer_decl,
2114 TREE_VALUE (gnu_except_ptr_stack));
2115 annotate_with_node (gnu_expr, gnat_node);
2118 *gnu_else_ptr = gnu_expr;
2120 add_stmt (gnu_expr);
2122 /* End the binding level dedicated to the exception handlers and get the
2123 whole statement group. */
2124 pop_stack (&gnu_except_ptr_stack);
2126 gnu_handler = end_stmt_group ();
2128 /* If the setjmp returns 1, we restore our incoming longjmp value and
2129 then check the handlers. */
2130 start_stmt_group ();
2131 add_stmt_with_node (build_call_1_expr (set_jmpbuf_decl,
2134 add_stmt (gnu_handler);
2135 gnu_handler = end_stmt_group ();
2137 /* This block is now "if (setjmp) ... <handlers> else <block>". */
2138 gnu_result = build3 (COND_EXPR, void_type_node,
2141 build_unary_op (ADDR_EXPR, NULL_TREE,
2143 gnu_handler, gnu_inner_block);
2149 /* First make a block containing the handlers. */
2150 start_stmt_group ();
2151 for (gnat_temp = First_Non_Pragma (Exception_Handlers (gnat_node));
2152 Present (gnat_temp);
2153 gnat_temp = Next_Non_Pragma (gnat_temp))
2154 add_stmt (gnat_to_gnu (gnat_temp));
2155 gnu_handlers = end_stmt_group ();
2157 /* Now make the TRY_CATCH_EXPR for the block. */
2158 gnu_result = build2 (TRY_CATCH_EXPR, void_type_node,
2159 gnu_inner_block, gnu_handlers);
2162 gnu_result = gnu_inner_block;
2164 /* Now close our outer block, if we had to make one. */
2165 if (binding_for_block)
2167 add_stmt (gnu_result);
2169 gnu_result = end_stmt_group ();
2175 /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Exception_Handler,
2176 to a GCC tree, which is returned. This is the variant for Setjmp_Longjmp
2177 exception handling. */
2180 Exception_Handler_to_gnu_sjlj (Node_Id gnat_node)
2182 /* Unless this is "Others" or the special "Non-Ada" exception for Ada, make
2183 an "if" statement to select the proper exceptions. For "Others", exclude
2184 exceptions where Handled_By_Others is nonzero unless the All_Others flag
2185 is set. For "Non-ada", accept an exception if "Lang" is 'V'. */
2186 tree gnu_choice = integer_zero_node;
2187 tree gnu_body = build_stmt_group (Statements (gnat_node), false);
2190 for (gnat_temp = First (Exception_Choices (gnat_node));
2191 gnat_temp; gnat_temp = Next (gnat_temp))
2195 if (Nkind (gnat_temp) == N_Others_Choice)
2197 if (All_Others (gnat_temp))
2198 this_choice = integer_one_node;
2202 (EQ_EXPR, integer_type_node,
2207 (INDIRECT_REF, NULL_TREE,
2208 TREE_VALUE (gnu_except_ptr_stack)),
2209 get_identifier ("not_handled_by_others"), NULL_TREE,
2214 else if (Nkind (gnat_temp) == N_Identifier
2215 || Nkind (gnat_temp) == N_Expanded_Name)
2217 Entity_Id gnat_ex_id = Entity (gnat_temp);
2220 /* Exception may be a renaming. Recover original exception which is
2221 the one elaborated and registered. */
2222 if (Present (Renamed_Object (gnat_ex_id)))
2223 gnat_ex_id = Renamed_Object (gnat_ex_id);
2225 gnu_expr = gnat_to_gnu_entity (gnat_ex_id, NULL_TREE, 0);
2229 (EQ_EXPR, integer_type_node, TREE_VALUE (gnu_except_ptr_stack),
2230 convert (TREE_TYPE (TREE_VALUE (gnu_except_ptr_stack)),
2231 build_unary_op (ADDR_EXPR, NULL_TREE, gnu_expr)));
2233 /* If this is the distinguished exception "Non_Ada_Error" (and we are
2234 in VMS mode), also allow a non-Ada exception (a VMS condition) t
2236 if (Is_Non_Ada_Error (Entity (gnat_temp)))
2239 = build_component_ref
2240 (build_unary_op (INDIRECT_REF, NULL_TREE,
2241 TREE_VALUE (gnu_except_ptr_stack)),
2242 get_identifier ("lang"), NULL_TREE, false);
2246 (TRUTH_ORIF_EXPR, integer_type_node,
2247 build_binary_op (EQ_EXPR, integer_type_node, gnu_comp,
2248 build_int_cst (TREE_TYPE (gnu_comp), 'V')),
2255 gnu_choice = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
2256 gnu_choice, this_choice);
2259 return build3 (COND_EXPR, void_type_node, gnu_choice, gnu_body, NULL_TREE);
2262 /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Exception_Handler,
2263 to a GCC tree, which is returned. This is the variant for ZCX. */
2266 Exception_Handler_to_gnu_zcx (Node_Id gnat_node)
2268 tree gnu_etypes_list = NULL_TREE;
2271 tree gnu_current_exc_ptr;
2272 tree gnu_incoming_exc_ptr;
2275 /* We build a TREE_LIST of nodes representing what exception types this
2276 handler can catch, with special cases for others and all others cases.
2278 Each exception type is actually identified by a pointer to the exception
2279 id, or to a dummy object for "others" and "all others".
2281 Care should be taken to ensure that the control flow impact of "others"
2282 and "all others" is known to GCC. lang_eh_type_covers is doing the trick
2284 for (gnat_temp = First (Exception_Choices (gnat_node));
2285 gnat_temp; gnat_temp = Next (gnat_temp))
2287 if (Nkind (gnat_temp) == N_Others_Choice)
2290 = All_Others (gnat_temp) ? all_others_decl : others_decl;
2293 = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_expr);
2295 else if (Nkind (gnat_temp) == N_Identifier
2296 || Nkind (gnat_temp) == N_Expanded_Name)
2298 Entity_Id gnat_ex_id = Entity (gnat_temp);
2300 /* Exception may be a renaming. Recover original exception which is
2301 the one elaborated and registered. */
2302 if (Present (Renamed_Object (gnat_ex_id)))
2303 gnat_ex_id = Renamed_Object (gnat_ex_id);
2305 gnu_expr = gnat_to_gnu_entity (gnat_ex_id, NULL_TREE, 0);
2306 gnu_etype = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_expr);
2308 /* The Non_Ada_Error case for VMS exceptions is handled
2309 by the personality routine. */
2314 /* The GCC interface expects NULL to be passed for catch all handlers, so
2315 it would be quite tempting to set gnu_etypes_list to NULL if gnu_etype
2316 is integer_zero_node. It would not work, however, because GCC's
2317 notion of "catch all" is stronger than our notion of "others". Until
2318 we correctly use the cleanup interface as well, doing that would
2319 prevent the "all others" handlers from being seen, because nothing
2320 can be caught beyond a catch all from GCC's point of view. */
2321 gnu_etypes_list = tree_cons (NULL_TREE, gnu_etype, gnu_etypes_list);
2324 start_stmt_group ();
2327 /* Expand a call to the begin_handler hook at the beginning of the handler,
2328 and arrange for a call to the end_handler hook to occur on every possible
2331 The hooks expect a pointer to the low level occurrence. This is required
2332 for our stack management scheme because a raise inside the handler pushes
2333 a new occurrence on top of the stack, which means that this top does not
2334 necessarily match the occurrence this handler was dealing with.
2336 The EXC_PTR_EXPR object references the exception occurrence being
2337 propagated. Upon handler entry, this is the exception for which the
2338 handler is triggered. This might not be the case upon handler exit,
2339 however, as we might have a new occurrence propagated by the handler's
2340 body, and the end_handler hook called as a cleanup in this context.
2342 We use a local variable to retrieve the incoming value at handler entry
2343 time, and reuse it to feed the end_handler hook's argument at exit. */
2344 gnu_current_exc_ptr = build0 (EXC_PTR_EXPR, ptr_type_node);
2345 gnu_incoming_exc_ptr = create_var_decl (get_identifier ("EXPTR"), NULL_TREE,
2346 ptr_type_node, gnu_current_exc_ptr,
2347 false, false, false, false, NULL,
2350 add_stmt_with_node (build_call_1_expr (begin_handler_decl,
2351 gnu_incoming_exc_ptr),
2353 add_cleanup (build_call_1_expr (end_handler_decl, gnu_incoming_exc_ptr));
2354 add_stmt_list (Statements (gnat_node));
2357 return build2 (CATCH_EXPR, void_type_node, gnu_etypes_list,
2361 /* Subroutine of gnat_to_gnu to generate code for an N_Compilation unit. */
2364 Compilation_Unit_to_gnu (Node_Id gnat_node)
2366 /* Make the decl for the elaboration procedure. */
2367 bool body_p = (Defining_Entity (Unit (gnat_node)),
2368 Nkind (Unit (gnat_node)) == N_Package_Body
2369 || Nkind (Unit (gnat_node)) == N_Subprogram_Body);
2370 Entity_Id gnat_unit_entity = Defining_Entity (Unit (gnat_node));
2371 tree gnu_elab_proc_decl
2372 = create_subprog_decl
2373 (create_concat_name (gnat_unit_entity,
2374 body_p ? "elabb" : "elabs"),
2375 NULL_TREE, void_ftype, NULL_TREE, false, true, false, NULL,
2377 struct elab_info *info;
2379 push_stack (&gnu_elab_proc_stack, NULL_TREE, gnu_elab_proc_decl);
2381 DECL_ELABORATION_PROC_P (gnu_elab_proc_decl) = 1;
2382 allocate_struct_function (gnu_elab_proc_decl);
2383 Sloc_to_locus (Sloc (gnat_unit_entity), &cfun->function_end_locus);
2386 /* For a body, first process the spec if there is one. */
2387 if (Nkind (Unit (gnat_node)) == N_Package_Body
2388 || (Nkind (Unit (gnat_node)) == N_Subprogram_Body
2389 && !Acts_As_Spec (gnat_node)))
2390 add_stmt (gnat_to_gnu (Library_Unit (gnat_node)));
2392 process_inlined_subprograms (gnat_node);
2394 if (type_annotate_only)
2396 elaborate_all_entities (gnat_node);
2398 if (Nkind (Unit (gnat_node)) == N_Subprogram_Declaration
2399 || Nkind (Unit (gnat_node)) == N_Generic_Package_Declaration
2400 || Nkind (Unit (gnat_node)) == N_Generic_Subprogram_Declaration)
2404 process_decls (Declarations (Aux_Decls_Node (gnat_node)), Empty, Empty,
2406 add_stmt (gnat_to_gnu (Unit (gnat_node)));
2408 /* Process any pragmas and actions following the unit. */
2409 add_stmt_list (Pragmas_After (Aux_Decls_Node (gnat_node)));
2410 add_stmt_list (Actions (Aux_Decls_Node (gnat_node)));
2412 /* Save away what we've made so far and record this potential elaboration
2414 info = (struct elab_info *) ggc_alloc (sizeof (struct elab_info));
2415 set_current_block_context (gnu_elab_proc_decl);
2417 DECL_SAVED_TREE (gnu_elab_proc_decl) = end_stmt_group ();
2418 info->next = elab_info_list;
2419 info->elab_proc = gnu_elab_proc_decl;
2420 info->gnat_node = gnat_node;
2421 elab_info_list = info;
2423 /* Generate elaboration code for this unit, if necessary, and say whether
2425 pop_stack (&gnu_elab_proc_stack);
2428 /* This function is the driver of the GNAT to GCC tree transformation
2429 process. It is the entry point of the tree transformer. GNAT_NODE is the
2430 root of some GNAT tree. Return the root of the corresponding GCC tree.
2431 If this is an expression, return the GCC equivalent of the expression. If
2432 it is a statement, return the statement. In the case when called for a
2433 statement, it may also add statements to the current statement group, in
2434 which case anything it returns is to be interpreted as occurring after
2435 anything `it already added. */
2438 gnat_to_gnu (Node_Id gnat_node)
2440 bool went_into_elab_proc = false;
2441 tree gnu_result = error_mark_node; /* Default to no value. */
2442 tree gnu_result_type = void_type_node;
2444 tree gnu_lhs, gnu_rhs;
2447 /* Save node number for error message and set location information. */
2448 error_gnat_node = gnat_node;
2449 Sloc_to_locus (Sloc (gnat_node), &input_location);
2451 if (type_annotate_only
2452 && IN (Nkind (gnat_node), N_Statement_Other_Than_Procedure_Call))
2453 return alloc_stmt_list ();
2455 /* If this node is a non-static subexpression and we are only
2456 annotating types, make this into a NULL_EXPR. */
2457 if (type_annotate_only
2458 && IN (Nkind (gnat_node), N_Subexpr)
2459 && Nkind (gnat_node) != N_Identifier
2460 && !Compile_Time_Known_Value (gnat_node))
2461 return build1 (NULL_EXPR, get_unpadded_type (Etype (gnat_node)),
2462 build_call_raise (CE_Range_Check_Failed));
2464 /* If this is a Statement and we are at top level, it must be part of
2465 the elaboration procedure, so mark us as being in that procedure
2466 and push our context. */
2467 if (!current_function_decl
2468 && ((IN (Nkind (gnat_node), N_Statement_Other_Than_Procedure_Call)
2469 && Nkind (gnat_node) != N_Null_Statement)
2470 || Nkind (gnat_node) == N_Procedure_Call_Statement
2471 || Nkind (gnat_node) == N_Label
2472 || Nkind (gnat_node) == N_Implicit_Label_Declaration
2473 || Nkind (gnat_node) == N_Handled_Sequence_Of_Statements
2474 || ((Nkind (gnat_node) == N_Raise_Constraint_Error
2475 || Nkind (gnat_node) == N_Raise_Storage_Error
2476 || Nkind (gnat_node) == N_Raise_Program_Error)
2477 && (Ekind (Etype (gnat_node)) == E_Void))))
2479 current_function_decl = TREE_VALUE (gnu_elab_proc_stack);
2480 start_stmt_group ();
2482 went_into_elab_proc = true;
2485 switch (Nkind (gnat_node))
2487 /********************************/
2488 /* Chapter 2: Lexical Elements: */
2489 /********************************/
2492 case N_Expanded_Name:
2493 case N_Operator_Symbol:
2494 case N_Defining_Identifier:
2495 gnu_result = Identifier_to_gnu (gnat_node, &gnu_result_type);
2498 case N_Integer_Literal:
2502 /* Get the type of the result, looking inside any padding and
2503 justified modular types. Then get the value in that type. */
2504 gnu_type = gnu_result_type = get_unpadded_type (Etype (gnat_node));
2506 if (TREE_CODE (gnu_type) == RECORD_TYPE
2507 && TYPE_JUSTIFIED_MODULAR_P (gnu_type))
2508 gnu_type = TREE_TYPE (TYPE_FIELDS (gnu_type));
2510 gnu_result = UI_To_gnu (Intval (gnat_node), gnu_type);
2512 /* If the result overflows (meaning it doesn't fit in its base type),
2513 abort. We would like to check that the value is within the range
2514 of the subtype, but that causes problems with subtypes whose usage
2515 will raise Constraint_Error and with biased representation, so
2517 gcc_assert (!TREE_CONSTANT_OVERFLOW (gnu_result));
2521 case N_Character_Literal:
2522 /* If a Entity is present, it means that this was one of the
2523 literals in a user-defined character type. In that case,
2524 just return the value in the CONST_DECL. Otherwise, use the
2525 character code. In that case, the base type should be an
2526 INTEGER_TYPE, but we won't bother checking for that. */
2527 gnu_result_type = get_unpadded_type (Etype (gnat_node));
2528 if (Present (Entity (gnat_node)))
2529 gnu_result = DECL_INITIAL (get_gnu_tree (Entity (gnat_node)));
2534 (gnu_result_type, UI_To_CC (Char_Literal_Value (gnat_node))),
2535 false, false, false);
2538 case N_Real_Literal:
2539 /* If this is of a fixed-point type, the value we want is the
2540 value of the corresponding integer. */
2541 if (IN (Ekind (Underlying_Type (Etype (gnat_node))), Fixed_Point_Kind))
2543 gnu_result_type = get_unpadded_type (Etype (gnat_node));
2544 gnu_result = UI_To_gnu (Corresponding_Integer_Value (gnat_node),
2546 gcc_assert (!TREE_CONSTANT_OVERFLOW (gnu_result));
2549 /* We should never see a Vax_Float type literal, since the front end
2550 is supposed to transform these using appropriate conversions */
2551 else if (Vax_Float (Underlying_Type (Etype (gnat_node))))
2556 Ureal ur_realval = Realval (gnat_node);
2558 gnu_result_type = get_unpadded_type (Etype (gnat_node));
2560 /* If the real value is zero, so is the result. Otherwise,
2561 convert it to a machine number if it isn't already. That
2562 forces BASE to 0 or 2 and simplifies the rest of our logic. */
2563 if (UR_Is_Zero (ur_realval))
2564 gnu_result = convert (gnu_result_type, integer_zero_node);
2567 if (!Is_Machine_Number (gnat_node))
2569 = Machine (Base_Type (Underlying_Type (Etype (gnat_node))),
2570 ur_realval, Round_Even, gnat_node);
2573 = UI_To_gnu (Numerator (ur_realval), gnu_result_type);
2575 /* If we have a base of zero, divide by the denominator.
2576 Otherwise, the base must be 2 and we scale the value, which
2577 we know can fit in the mantissa of the type (hence the use
2578 of that type above). */
2579 if (No (Rbase (ur_realval)))
2581 = build_binary_op (RDIV_EXPR,
2582 get_base_type (gnu_result_type),
2584 UI_To_gnu (Denominator (ur_realval),
2588 REAL_VALUE_TYPE tmp;
2590 gcc_assert (Rbase (ur_realval) == 2);
2591 real_ldexp (&tmp, &TREE_REAL_CST (gnu_result),
2592 - UI_To_Int (Denominator (ur_realval)));
2593 gnu_result = build_real (gnu_result_type, tmp);
2597 /* Now see if we need to negate the result. Do it this way to
2598 properly handle -0. */
2599 if (UR_Is_Negative (Realval (gnat_node)))
2601 = build_unary_op (NEGATE_EXPR, get_base_type (gnu_result_type),
2607 case N_String_Literal:
2608 gnu_result_type = get_unpadded_type (Etype (gnat_node));
2609 if (TYPE_PRECISION (TREE_TYPE (gnu_result_type)) == HOST_BITS_PER_CHAR)
2611 String_Id gnat_string = Strval (gnat_node);
2612 int length = String_Length (gnat_string);
2613 char *string = (char *) alloca (length + 1);
2616 /* Build the string with the characters in the literal. Note
2617 that Ada strings are 1-origin. */
2618 for (i = 0; i < length; i++)
2619 string[i] = Get_String_Char (gnat_string, i + 1);
2621 /* Put a null at the end of the string in case it's in a context
2622 where GCC will want to treat it as a C string. */
2625 gnu_result = build_string (length, string);
2627 /* Strings in GCC don't normally have types, but we want
2628 this to not be converted to the array type. */
2629 TREE_TYPE (gnu_result) = gnu_result_type;
2633 /* Build a list consisting of each character, then make
2635 String_Id gnat_string = Strval (gnat_node);
2636 int length = String_Length (gnat_string);
2638 tree gnu_list = NULL_TREE;
2639 tree gnu_idx = TYPE_MIN_VALUE (TYPE_DOMAIN (gnu_result_type));
2641 for (i = 0; i < length; i++)
2644 = tree_cons (gnu_idx,
2645 build_int_cst (TREE_TYPE (gnu_result_type),
2646 Get_String_Char (gnat_string,
2650 gnu_idx = int_const_binop (PLUS_EXPR, gnu_idx, integer_one_node,
2655 = gnat_build_constructor (gnu_result_type, nreverse (gnu_list));
2660 gnu_result = Pragma_to_gnu (gnat_node);
2663 /**************************************/
2664 /* Chapter 3: Declarations and Types: */
2665 /**************************************/
2667 case N_Subtype_Declaration:
2668 case N_Full_Type_Declaration:
2669 case N_Incomplete_Type_Declaration:
2670 case N_Private_Type_Declaration:
2671 case N_Private_Extension_Declaration:
2672 case N_Task_Type_Declaration:
2673 process_type (Defining_Entity (gnat_node));
2674 gnu_result = alloc_stmt_list ();
2677 case N_Object_Declaration:
2678 case N_Exception_Declaration:
2679 gnat_temp = Defining_Entity (gnat_node);
2680 gnu_result = alloc_stmt_list ();
2682 /* If we are just annotating types and this object has an unconstrained
2683 or task type, don't elaborate it. */
2684 if (type_annotate_only
2685 && (((Is_Array_Type (Etype (gnat_temp))
2686 || Is_Record_Type (Etype (gnat_temp)))
2687 && !Is_Constrained (Etype (gnat_temp)))
2688 || Is_Concurrent_Type (Etype (gnat_temp))))
2691 if (Present (Expression (gnat_node))
2692 && !(Nkind (gnat_node) == N_Object_Declaration
2693 && No_Initialization (gnat_node))
2694 && (!type_annotate_only
2695 || Compile_Time_Known_Value (Expression (gnat_node))))
2697 gnu_expr = gnat_to_gnu (Expression (gnat_node));
2698 if (Do_Range_Check (Expression (gnat_node)))
2699 gnu_expr = emit_range_check (gnu_expr, Etype (gnat_temp));
2701 /* If this object has its elaboration delayed, we must force
2702 evaluation of GNU_EXPR right now and save it for when the object
2704 if (Present (Freeze_Node (gnat_temp)))
2706 if ((Is_Public (gnat_temp) || global_bindings_p ())
2707 && !TREE_CONSTANT (gnu_expr))
2709 = create_var_decl (create_concat_name (gnat_temp, "init"),
2710 NULL_TREE, TREE_TYPE (gnu_expr),
2711 gnu_expr, false, Is_Public (gnat_temp),
2712 false, false, NULL, gnat_temp);
2714 gnu_expr = maybe_variable (gnu_expr);
2716 save_gnu_tree (gnat_node, gnu_expr, true);
2720 gnu_expr = NULL_TREE;
2722 if (type_annotate_only && gnu_expr && TREE_CODE (gnu_expr) == ERROR_MARK)
2723 gnu_expr = NULL_TREE;
2725 if (No (Freeze_Node (gnat_temp)))
2726 gnat_to_gnu_entity (gnat_temp, gnu_expr, 1);
2729 case N_Object_Renaming_Declaration:
2730 gnat_temp = Defining_Entity (gnat_node);
2732 /* Don't do anything if this renaming is handled by the front end or if
2733 we are just annotating types and this object has a composite or task
2734 type, don't elaborate it. We return the result in case it has any
2735 SAVE_EXPRs in it that need to be evaluated here. */
2736 if (!Is_Renaming_Of_Object (gnat_temp)
2737 && ! (type_annotate_only
2738 && (Is_Array_Type (Etype (gnat_temp))
2739 || Is_Record_Type (Etype (gnat_temp))
2740 || Is_Concurrent_Type (Etype (gnat_temp)))))
2742 = gnat_to_gnu_entity (gnat_temp,
2743 gnat_to_gnu (Renamed_Object (gnat_temp)), 1);
2745 gnu_result = alloc_stmt_list ();
2748 case N_Implicit_Label_Declaration:
2749 gnat_to_gnu_entity (Defining_Entity (gnat_node), NULL_TREE, 1);
2750 gnu_result = alloc_stmt_list ();
2753 case N_Exception_Renaming_Declaration:
2754 case N_Number_Declaration:
2755 case N_Package_Renaming_Declaration:
2756 case N_Subprogram_Renaming_Declaration:
2757 /* These are fully handled in the front end. */
2758 gnu_result = alloc_stmt_list ();
2761 /*************************************/
2762 /* Chapter 4: Names and Expressions: */
2763 /*************************************/
2765 case N_Explicit_Dereference:
2766 gnu_result = gnat_to_gnu (Prefix (gnat_node));
2767 gnu_result_type = get_unpadded_type (Etype (gnat_node));
2768 gnu_result = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_result);
2771 case N_Indexed_Component:
2773 tree gnu_array_object = gnat_to_gnu (Prefix (gnat_node));
2777 Node_Id *gnat_expr_array;
2779 gnu_array_object = maybe_implicit_deref (gnu_array_object);
2780 gnu_array_object = maybe_unconstrained_array (gnu_array_object);
2782 /* If we got a padded type, remove it too. */
2783 if (TREE_CODE (TREE_TYPE (gnu_array_object)) == RECORD_TYPE
2784 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_array_object)))
2786 = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_array_object))),
2789 gnu_result = gnu_array_object;
2791 /* First compute the number of dimensions of the array, then
2792 fill the expression array, the order depending on whether
2793 this is a Convention_Fortran array or not. */
2794 for (ndim = 1, gnu_type = TREE_TYPE (gnu_array_object);
2795 TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE
2796 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type));
2797 ndim++, gnu_type = TREE_TYPE (gnu_type))
2800 gnat_expr_array = (Node_Id *) alloca (ndim * sizeof (Node_Id));
2802 if (TYPE_CONVENTION_FORTRAN_P (TREE_TYPE (gnu_array_object)))
2803 for (i = ndim - 1, gnat_temp = First (Expressions (gnat_node));
2805 i--, gnat_temp = Next (gnat_temp))
2806 gnat_expr_array[i] = gnat_temp;
2808 for (i = 0, gnat_temp = First (Expressions (gnat_node));
2810 i++, gnat_temp = Next (gnat_temp))
2811 gnat_expr_array[i] = gnat_temp;
2813 for (i = 0, gnu_type = TREE_TYPE (gnu_array_object);
2814 i < ndim; i++, gnu_type = TREE_TYPE (gnu_type))
2816 gcc_assert (TREE_CODE (gnu_type) == ARRAY_TYPE);
2817 gnat_temp = gnat_expr_array[i];
2818 gnu_expr = gnat_to_gnu (gnat_temp);
2820 if (Do_Range_Check (gnat_temp))
2823 (gnu_array_object, gnu_expr,
2824 TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))),
2825 TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))));
2827 gnu_result = build_binary_op (ARRAY_REF, NULL_TREE,
2828 gnu_result, gnu_expr);
2832 gnu_result_type = get_unpadded_type (Etype (gnat_node));
2838 Node_Id gnat_range_node = Discrete_Range (gnat_node);
2840 gnu_result = gnat_to_gnu (Prefix (gnat_node));
2841 gnu_result_type = get_unpadded_type (Etype (gnat_node));
2843 /* Do any implicit dereferences of the prefix and do any needed
2845 gnu_result = maybe_implicit_deref (gnu_result);
2846 gnu_result = maybe_unconstrained_array (gnu_result);
2847 gnu_type = TREE_TYPE (gnu_result);
2848 if (Do_Range_Check (gnat_range_node))
2850 /* Get the bounds of the slice. */
2852 = TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_result_type));
2853 tree gnu_min_expr = TYPE_MIN_VALUE (gnu_index_type);
2854 tree gnu_max_expr = TYPE_MAX_VALUE (gnu_index_type);
2855 tree gnu_expr_l, gnu_expr_h, gnu_expr_type;
2857 /* Check to see that the minimum slice value is in range */
2860 (gnu_result, gnu_min_expr,
2861 TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))),
2862 TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))));
2864 /* Check to see that the maximum slice value is in range */
2867 (gnu_result, gnu_max_expr,
2868 TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))),
2869 TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))));
2871 /* Derive a good type to convert everything too */
2872 gnu_expr_type = get_base_type (TREE_TYPE (gnu_expr_l));
2874 /* Build a compound expression that does the range checks */
2876 = build_binary_op (COMPOUND_EXPR, gnu_expr_type,
2877 convert (gnu_expr_type, gnu_expr_h),
2878 convert (gnu_expr_type, gnu_expr_l));
2880 /* Build a conditional expression that returns the range checks
2881 expression if the slice range is not null (max >= min) or
2882 returns the min if the slice range is null */
2884 = fold (build3 (COND_EXPR, gnu_expr_type,
2885 build_binary_op (GE_EXPR, gnu_expr_type,
2886 convert (gnu_expr_type,
2888 convert (gnu_expr_type,
2890 gnu_expr, gnu_min_expr));
2893 gnu_expr = TYPE_MIN_VALUE (TYPE_DOMAIN (gnu_result_type));
2895 gnu_result = build_binary_op (ARRAY_RANGE_REF, gnu_result_type,
2896 gnu_result, gnu_expr);
2900 case N_Selected_Component:
2902 tree gnu_prefix = gnat_to_gnu (Prefix (gnat_node));
2903 Entity_Id gnat_field = Entity (Selector_Name (gnat_node));
2904 Entity_Id gnat_pref_type = Etype (Prefix (gnat_node));
2907 while (IN (Ekind (gnat_pref_type), Incomplete_Or_Private_Kind)
2908 || IN (Ekind (gnat_pref_type), Access_Kind))
2910 if (IN (Ekind (gnat_pref_type), Incomplete_Or_Private_Kind))
2911 gnat_pref_type = Underlying_Type (gnat_pref_type);
2912 else if (IN (Ekind (gnat_pref_type), Access_Kind))
2913 gnat_pref_type = Designated_Type (gnat_pref_type);
2916 gnu_prefix = maybe_implicit_deref (gnu_prefix);
2918 /* For discriminant references in tagged types always substitute the
2919 corresponding discriminant as the actual selected component. */
2921 if (Is_Tagged_Type (gnat_pref_type))
2922 while (Present (Corresponding_Discriminant (gnat_field)))
2923 gnat_field = Corresponding_Discriminant (gnat_field);
2925 /* For discriminant references of untagged types always substitute the
2926 corresponding stored discriminant. */
2928 else if (Present (Corresponding_Discriminant (gnat_field)))
2929 gnat_field = Original_Record_Component (gnat_field);
2931 /* Handle extracting the real or imaginary part of a complex.
2932 The real part is the first field and the imaginary the last. */
2934 if (TREE_CODE (TREE_TYPE (gnu_prefix)) == COMPLEX_TYPE)
2935 gnu_result = build_unary_op (Present (Next_Entity (gnat_field))
2936 ? REALPART_EXPR : IMAGPART_EXPR,
2937 NULL_TREE, gnu_prefix);
2940 gnu_field = gnat_to_gnu_field_decl (gnat_field);
2942 /* If there are discriminants, the prefix might be
2943 evaluated more than once, which is a problem if it has
2945 if (Has_Discriminants (Is_Access_Type (Etype (Prefix (gnat_node)))
2946 ? Designated_Type (Etype
2947 (Prefix (gnat_node)))
2948 : Etype (Prefix (gnat_node))))
2949 gnu_prefix = gnat_stabilize_reference (gnu_prefix, 0);
2952 = build_component_ref (gnu_prefix, NULL_TREE, gnu_field,
2953 (Nkind (Parent (gnat_node))
2954 == N_Attribute_Reference));
2957 gcc_assert (gnu_result);
2958 gnu_result_type = get_unpadded_type (Etype (gnat_node));
2962 case N_Attribute_Reference:
2964 /* The attribute designator (like an enumeration value). */
2965 int attribute = Get_Attribute_Id (Attribute_Name (gnat_node));
2967 /* The Elab_Spec and Elab_Body attributes are special in that
2968 Prefix is a unit, not an object with a GCC equivalent. Similarly
2969 for Elaborated, since that variable isn't otherwise known. */
2970 if (attribute == Attr_Elab_Body || attribute == Attr_Elab_Spec)
2971 return (create_subprog_decl
2972 (create_concat_name (Entity (Prefix (gnat_node)),
2973 attribute == Attr_Elab_Body
2974 ? "elabb" : "elabs"),
2975 NULL_TREE, void_ftype, NULL_TREE, false, true, true, NULL,
2978 gnu_result = Attribute_to_gnu (gnat_node, &gnu_result_type, attribute);
2983 /* Like 'Access as far as we are concerned. */
2984 gnu_result = gnat_to_gnu (Prefix (gnat_node));
2985 gnu_result = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_result);
2986 gnu_result_type = get_unpadded_type (Etype (gnat_node));
2990 case N_Extension_Aggregate:
2994 /* ??? It is wrong to evaluate the type now, but there doesn't
2995 seem to be any other practical way of doing it. */
2997 gcc_assert (!Expansion_Delayed (gnat_node));
2999 gnu_aggr_type = gnu_result_type
3000 = get_unpadded_type (Etype (gnat_node));
3002 if (TREE_CODE (gnu_result_type) == RECORD_TYPE
3003 && TYPE_CONTAINS_TEMPLATE_P (gnu_result_type))
3005 = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_result_type)));
3007 if (Null_Record_Present (gnat_node))
3008 gnu_result = gnat_build_constructor (gnu_aggr_type, NULL_TREE);
3010 else if (TREE_CODE (gnu_aggr_type) == UNION_TYPE
3011 && TYPE_UNCHECKED_UNION_P (gnu_aggr_type))
3013 /* The first element is the discrimant, which we ignore. The
3014 next is the field we're building. Convert the expression
3015 to the type of the field and then to the union type. */
3017 = Next (First (Component_Associations (gnat_node)));
3018 Entity_Id gnat_field = Entity (First (Choices (gnat_assoc)));
3020 = TREE_TYPE (gnat_to_gnu_entity (gnat_field, NULL_TREE, 0));
3022 gnu_result = convert (gnu_field_type,
3023 gnat_to_gnu (Expression (gnat_assoc)));
3025 else if (TREE_CODE (gnu_aggr_type) == RECORD_TYPE
3026 || TREE_CODE (gnu_aggr_type) == UNION_TYPE)
3028 = assoc_to_constructor (First (Component_Associations (gnat_node)),
3030 else if (TREE_CODE (gnu_aggr_type) == ARRAY_TYPE)
3031 gnu_result = pos_to_constructor (First (Expressions (gnat_node)),
3033 Component_Type (Etype (gnat_node)));
3034 else if (TREE_CODE (gnu_aggr_type) == COMPLEX_TYPE)
3037 (COMPLEX_EXPR, gnu_aggr_type,
3038 gnat_to_gnu (Expression (First
3039 (Component_Associations (gnat_node)))),
3040 gnat_to_gnu (Expression
3042 (First (Component_Associations (gnat_node))))));
3046 gnu_result = convert (gnu_result_type, gnu_result);
3051 gnu_result = null_pointer_node;
3052 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3055 case N_Type_Conversion:
3056 case N_Qualified_Expression:
3057 /* Get the operand expression. */
3058 gnu_result = gnat_to_gnu (Expression (gnat_node));
3059 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3062 = convert_with_check (Etype (gnat_node), gnu_result,
3063 Do_Overflow_Check (gnat_node),
3064 Do_Range_Check (Expression (gnat_node)),
3065 Nkind (gnat_node) == N_Type_Conversion
3066 && Float_Truncate (gnat_node));
3069 case N_Unchecked_Type_Conversion:
3070 gnu_result = gnat_to_gnu (Expression (gnat_node));
3071 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3073 /* If the result is a pointer type, see if we are improperly
3074 converting to a stricter alignment. */
3076 if (STRICT_ALIGNMENT && POINTER_TYPE_P (gnu_result_type)
3077 && IN (Ekind (Etype (gnat_node)), Access_Kind))
3079 unsigned int align = known_alignment (gnu_result);
3080 tree gnu_obj_type = TREE_TYPE (gnu_result_type);
3081 unsigned int oalign = TYPE_ALIGN (gnu_obj_type);
3083 if (align != 0 && align < oalign && !TYPE_ALIGN_OK (gnu_obj_type))
3084 post_error_ne_tree_2
3085 ("?source alignment (^) < alignment of & (^)",
3086 gnat_node, Designated_Type (Etype (gnat_node)),
3087 size_int (align / BITS_PER_UNIT), oalign / BITS_PER_UNIT);
3090 gnu_result = unchecked_convert (gnu_result_type, gnu_result,
3091 No_Truncation (gnat_node));
3097 tree gnu_object = gnat_to_gnu (Left_Opnd (gnat_node));
3098 Node_Id gnat_range = Right_Opnd (gnat_node);
3102 /* GNAT_RANGE is either an N_Range node or an identifier
3103 denoting a subtype. */
3104 if (Nkind (gnat_range) == N_Range)
3106 gnu_low = gnat_to_gnu (Low_Bound (gnat_range));
3107 gnu_high = gnat_to_gnu (High_Bound (gnat_range));
3109 else if (Nkind (gnat_range) == N_Identifier
3110 || Nkind (gnat_range) == N_Expanded_Name)
3112 tree gnu_range_type = get_unpadded_type (Entity (gnat_range));
3114 gnu_low = TYPE_MIN_VALUE (gnu_range_type);
3115 gnu_high = TYPE_MAX_VALUE (gnu_range_type);
3120 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3122 /* If LOW and HIGH are identical, perform an equality test.
3123 Otherwise, ensure that GNU_OBJECT is only evaluated once
3124 and perform a full range test. */
3125 if (operand_equal_p (gnu_low, gnu_high, 0))
3126 gnu_result = build_binary_op (EQ_EXPR, gnu_result_type,
3127 gnu_object, gnu_low);
3130 gnu_object = protect_multiple_eval (gnu_object);
3132 = build_binary_op (TRUTH_ANDIF_EXPR, gnu_result_type,
3133 build_binary_op (GE_EXPR, gnu_result_type,
3134 gnu_object, gnu_low),
3135 build_binary_op (LE_EXPR, gnu_result_type,
3136 gnu_object, gnu_high));
3139 if (Nkind (gnat_node) == N_Not_In)
3140 gnu_result = invert_truthvalue (gnu_result);
3145 gnu_lhs = gnat_to_gnu (Left_Opnd (gnat_node));
3146 gnu_rhs = gnat_to_gnu (Right_Opnd (gnat_node));
3147 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3148 gnu_result = build_binary_op (FLOAT_TYPE_P (gnu_result_type)
3150 : (Rounded_Result (gnat_node)
3151 ? ROUND_DIV_EXPR : TRUNC_DIV_EXPR),
3152 gnu_result_type, gnu_lhs, gnu_rhs);
3155 case N_Op_Or: case N_Op_And: case N_Op_Xor:
3156 /* These can either be operations on booleans or on modular types.
3157 Fall through for boolean types since that's the way GNU_CODES is
3159 if (IN (Ekind (Underlying_Type (Etype (gnat_node))),
3160 Modular_Integer_Kind))
3163 = (Nkind (gnat_node) == N_Op_Or ? BIT_IOR_EXPR
3164 : Nkind (gnat_node) == N_Op_And ? BIT_AND_EXPR
3167 gnu_lhs = gnat_to_gnu (Left_Opnd (gnat_node));
3168 gnu_rhs = gnat_to_gnu (Right_Opnd (gnat_node));
3169 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3170 gnu_result = build_binary_op (code, gnu_result_type,
3175 /* ... fall through ... */
3177 case N_Op_Eq: case N_Op_Ne: case N_Op_Lt:
3178 case N_Op_Le: case N_Op_Gt: case N_Op_Ge:
3179 case N_Op_Add: case N_Op_Subtract: case N_Op_Multiply:
3180 case N_Op_Mod: case N_Op_Rem:
3181 case N_Op_Rotate_Left:
3182 case N_Op_Rotate_Right:
3183 case N_Op_Shift_Left:
3184 case N_Op_Shift_Right:
3185 case N_Op_Shift_Right_Arithmetic:
3186 case N_And_Then: case N_Or_Else:
3188 enum tree_code code = gnu_codes[Nkind (gnat_node)];
3191 gnu_lhs = gnat_to_gnu (Left_Opnd (gnat_node));
3192 gnu_rhs = gnat_to_gnu (Right_Opnd (gnat_node));
3193 gnu_type = gnu_result_type = get_unpadded_type (Etype (gnat_node));
3195 /* If this is a comparison operator, convert any references to
3196 an unconstrained array value into a reference to the
3198 if (TREE_CODE_CLASS (code) == tcc_comparison)
3200 gnu_lhs = maybe_unconstrained_array (gnu_lhs);
3201 gnu_rhs = maybe_unconstrained_array (gnu_rhs);
3204 /* If the result type is a private type, its full view may be a
3205 numeric subtype. The representation we need is that of its base
3206 type, given that it is the result of an arithmetic operation. */
3207 else if (Is_Private_Type (Etype (gnat_node)))
3208 gnu_type = gnu_result_type
3209 = get_unpadded_type (Base_Type (Full_View (Etype (gnat_node))));
3211 /* If this is a shift whose count is not guaranteed to be correct,
3212 we need to adjust the shift count. */
3213 if (IN (Nkind (gnat_node), N_Op_Shift)
3214 && !Shift_Count_OK (gnat_node))
3216 tree gnu_count_type = get_base_type (TREE_TYPE (gnu_rhs));
3218 = convert (gnu_count_type, TYPE_SIZE (gnu_type));
3220 if (Nkind (gnat_node) == N_Op_Rotate_Left
3221 || Nkind (gnat_node) == N_Op_Rotate_Right)
3222 gnu_rhs = build_binary_op (TRUNC_MOD_EXPR, gnu_count_type,
3223 gnu_rhs, gnu_max_shift);
3224 else if (Nkind (gnat_node) == N_Op_Shift_Right_Arithmetic)
3227 (MIN_EXPR, gnu_count_type,
3228 build_binary_op (MINUS_EXPR,
3231 convert (gnu_count_type,
3236 /* For right shifts, the type says what kind of shift to do,
3237 so we may need to choose a different type. */
3238 if (Nkind (gnat_node) == N_Op_Shift_Right
3239 && !TYPE_UNSIGNED (gnu_type))
3240 gnu_type = gnat_unsigned_type (gnu_type);
3241 else if (Nkind (gnat_node) == N_Op_Shift_Right_Arithmetic
3242 && TYPE_UNSIGNED (gnu_type))
3243 gnu_type = gnat_signed_type (gnu_type);
3245 if (gnu_type != gnu_result_type)
3247 gnu_lhs = convert (gnu_type, gnu_lhs);
3248 gnu_rhs = convert (gnu_type, gnu_rhs);
3251 gnu_result = build_binary_op (code, gnu_type, gnu_lhs, gnu_rhs);
3253 /* If this is a logical shift with the shift count not verified,
3254 we must return zero if it is too large. We cannot compensate
3255 above in this case. */
3256 if ((Nkind (gnat_node) == N_Op_Shift_Left
3257 || Nkind (gnat_node) == N_Op_Shift_Right)
3258 && !Shift_Count_OK (gnat_node))
3262 build_binary_op (GE_EXPR, integer_type_node,
3264 convert (TREE_TYPE (gnu_rhs),
3265 TYPE_SIZE (gnu_type))),
3266 convert (gnu_type, integer_zero_node),
3271 case N_Conditional_Expression:
3273 tree gnu_cond = gnat_to_gnu (First (Expressions (gnat_node)));
3274 tree gnu_true = gnat_to_gnu (Next (First (Expressions (gnat_node))));
3276 = gnat_to_gnu (Next (Next (First (Expressions (gnat_node)))));
3278 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3279 gnu_result = build_cond_expr (gnu_result_type,
3280 gnat_truthvalue_conversion (gnu_cond),
3281 gnu_true, gnu_false);
3286 gnu_result = gnat_to_gnu (Right_Opnd (gnat_node));
3287 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3291 /* This case can apply to a boolean or a modular type.
3292 Fall through for a boolean operand since GNU_CODES is set
3293 up to handle this. */
3294 if (IN (Ekind (Etype (gnat_node)), Modular_Integer_Kind))
3296 gnu_expr = gnat_to_gnu (Right_Opnd (gnat_node));
3297 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3298 gnu_result = build_unary_op (BIT_NOT_EXPR, gnu_result_type,
3303 /* ... fall through ... */
3305 case N_Op_Minus: case N_Op_Abs:
3306 gnu_expr = gnat_to_gnu (Right_Opnd (gnat_node));
3308 if (Ekind (Etype (gnat_node)) != E_Private_Type)
3309 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3311 gnu_result_type = get_unpadded_type (Base_Type
3312 (Full_View (Etype (gnat_node))));
3314 gnu_result = build_unary_op (gnu_codes[Nkind (gnat_node)],
3315 gnu_result_type, gnu_expr);
3323 gnat_temp = Expression (gnat_node);
3325 /* The Expression operand can either be an N_Identifier or
3326 Expanded_Name, which must represent a type, or a
3327 N_Qualified_Expression, which contains both the object type and an
3328 initial value for the object. */
3329 if (Nkind (gnat_temp) == N_Identifier
3330 || Nkind (gnat_temp) == N_Expanded_Name)
3331 gnu_type = gnat_to_gnu_type (Entity (gnat_temp));
3332 else if (Nkind (gnat_temp) == N_Qualified_Expression)
3334 Entity_Id gnat_desig_type
3335 = Designated_Type (Underlying_Type (Etype (gnat_node)));
3337 gnu_init = gnat_to_gnu (Expression (gnat_temp));
3339 gnu_init = maybe_unconstrained_array (gnu_init);
3340 if (Do_Range_Check (Expression (gnat_temp)))
3341 gnu_init = emit_range_check (gnu_init, gnat_desig_type);
3343 if (Is_Elementary_Type (gnat_desig_type)
3344 || Is_Constrained (gnat_desig_type))
3346 gnu_type = gnat_to_gnu_type (gnat_desig_type);
3347 gnu_init = convert (gnu_type, gnu_init);
3351 gnu_type = gnat_to_gnu_type (Etype (Expression (gnat_temp)));
3352 if (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
3353 gnu_type = TREE_TYPE (gnu_init);
3355 gnu_init = convert (gnu_type, gnu_init);
3361 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3362 return build_allocator (gnu_type, gnu_init, gnu_result_type,
3363 Procedure_To_Call (gnat_node),
3364 Storage_Pool (gnat_node), gnat_node);
3368 /***************************/
3369 /* Chapter 5: Statements: */
3370 /***************************/
3373 gnu_result = build1 (LABEL_EXPR, void_type_node,
3374 gnat_to_gnu (Identifier (gnat_node)));
3377 case N_Null_Statement:
3378 gnu_result = alloc_stmt_list ();
3381 case N_Assignment_Statement:
3382 /* Get the LHS and RHS of the statement and convert any reference to an
3383 unconstrained array into a reference to the underlying array.
3384 If we are not to do range checking and the RHS is an N_Function_Call,
3385 pass the LHS to the call function. */
3386 gnu_lhs = maybe_unconstrained_array (gnat_to_gnu (Name (gnat_node)));
3388 /* If the type has a size that overflows, convert this into raise of
3389 Storage_Error: execution shouldn't have gotten here anyway. */
3390 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (gnu_lhs))) == INTEGER_CST
3391 && TREE_OVERFLOW (TYPE_SIZE (TREE_TYPE (gnu_lhs))))
3392 gnu_result = build_call_raise (SE_Object_Too_Large);
3393 else if (Nkind (Expression (gnat_node)) == N_Function_Call
3394 && !Do_Range_Check (Expression (gnat_node)))
3395 gnu_result = call_to_gnu (Expression (gnat_node),
3396 &gnu_result_type, gnu_lhs);
3400 = maybe_unconstrained_array (gnat_to_gnu (Expression (gnat_node)));
3402 /* If range check is needed, emit code to generate it */
3403 if (Do_Range_Check (Expression (gnat_node)))
3404 gnu_rhs = emit_range_check (gnu_rhs, Etype (Name (gnat_node)));
3407 = build_binary_op (MODIFY_EXPR, NULL_TREE, gnu_lhs, gnu_rhs);
3411 case N_If_Statement:
3413 tree *gnu_else_ptr; /* Point to put next "else if" or "else". */
3415 /* Make the outer COND_EXPR. Avoid non-determinism. */
3416 gnu_result = build3 (COND_EXPR, void_type_node,
3417 gnat_to_gnu (Condition (gnat_node)),
3418 NULL_TREE, NULL_TREE);
3419 COND_EXPR_THEN (gnu_result)
3420 = build_stmt_group (Then_Statements (gnat_node), false);
3421 TREE_SIDE_EFFECTS (gnu_result) = 1;
3422 gnu_else_ptr = &COND_EXPR_ELSE (gnu_result);
3424 /* Now make a COND_EXPR for each of the "else if" parts. Put each
3425 into the previous "else" part and point to where to put any
3426 outer "else". Also avoid non-determinism. */
3427 if (Present (Elsif_Parts (gnat_node)))
3428 for (gnat_temp = First (Elsif_Parts (gnat_node));
3429 Present (gnat_temp); gnat_temp = Next (gnat_temp))
3431 gnu_expr = build3 (COND_EXPR, void_type_node,
3432 gnat_to_gnu (Condition (gnat_temp)),
3433 NULL_TREE, NULL_TREE);
3434 COND_EXPR_THEN (gnu_expr)
3435 = build_stmt_group (Then_Statements (gnat_temp), false);
3436 TREE_SIDE_EFFECTS (gnu_expr) = 1;
3437 annotate_with_node (gnu_expr, gnat_temp);
3438 *gnu_else_ptr = gnu_expr;
3439 gnu_else_ptr = &COND_EXPR_ELSE (gnu_expr);
3442 *gnu_else_ptr = build_stmt_group (Else_Statements (gnat_node), false);
3446 case N_Case_Statement:
3447 gnu_result = Case_Statement_to_gnu (gnat_node);
3450 case N_Loop_Statement:
3451 gnu_result = Loop_Statement_to_gnu (gnat_node);
3454 case N_Block_Statement:
3455 start_stmt_group ();
3457 process_decls (Declarations (gnat_node), Empty, Empty, true, true);
3458 add_stmt (gnat_to_gnu (Handled_Statement_Sequence (gnat_node)));
3460 gnu_result = end_stmt_group ();
3462 if (Present (Identifier (gnat_node)))
3463 mark_out_of_scope (Entity (Identifier (gnat_node)));
3466 case N_Exit_Statement:
3468 = build2 (EXIT_STMT, void_type_node,
3469 (Present (Condition (gnat_node))
3470 ? gnat_to_gnu (Condition (gnat_node)) : NULL_TREE),
3471 (Present (Name (gnat_node))
3472 ? get_gnu_tree (Entity (Name (gnat_node)))
3473 : TREE_VALUE (gnu_loop_label_stack)));
3476 case N_Return_Statement:
3478 /* The gnu function type of the subprogram currently processed. */
3479 tree gnu_subprog_type = TREE_TYPE (current_function_decl);
3480 /* The return value from the subprogram. */
3481 tree gnu_ret_val = NULL_TREE;
3482 /* The place to put the return value. */
3484 /* Avoid passing error_mark_node to RETURN_EXPR. */
3485 gnu_result = NULL_TREE;
3487 /* If we are dealing with a "return;" from an Ada procedure with
3488 parameters passed by copy in copy out, we need to return a record
3489 containing the final values of these parameters. If the list
3490 contains only one entry, return just that entry.
3492 For a full description of the copy in copy out parameter mechanism,
3493 see the part of the gnat_to_gnu_entity routine dealing with the
3494 translation of subprograms.
3496 But if we have a return label defined, convert this into
3497 a branch to that label. */
3499 if (TREE_VALUE (gnu_return_label_stack))
3501 gnu_result = build1 (GOTO_EXPR, void_type_node,
3502 TREE_VALUE (gnu_return_label_stack));
3506 else if (TYPE_CI_CO_LIST (gnu_subprog_type))
3508 gnu_lhs = DECL_RESULT (current_function_decl);
3509 if (list_length (TYPE_CI_CO_LIST (gnu_subprog_type)) == 1)
3510 gnu_ret_val = TREE_VALUE (TYPE_CI_CO_LIST (gnu_subprog_type));
3513 = gnat_build_constructor (TREE_TYPE (gnu_subprog_type),
3514 TYPE_CI_CO_LIST (gnu_subprog_type));
3517 /* If the Ada subprogram is a function, we just need to return the
3518 expression. If the subprogram returns an unconstrained
3519 array, we have to allocate a new version of the result and
3520 return it. If we return by reference, return a pointer. */
3522 else if (Present (Expression (gnat_node)))
3524 /* If the current function returns by target pointer and we
3525 are doing a call, pass that target to the call. */
3526 if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type)
3527 && Nkind (Expression (gnat_node)) == N_Function_Call)
3530 = build_unary_op (INDIRECT_REF, NULL_TREE,
3531 DECL_ARGUMENTS (current_function_decl));
3532 gnu_result = call_to_gnu (Expression (gnat_node),
3533 &gnu_result_type, gnu_lhs);
3537 gnu_ret_val = gnat_to_gnu (Expression (gnat_node));
3539 if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type))
3540 /* The original return type was unconstrained so dereference
3541 the TARGET pointer in the actual return value's type. */
3543 = build_unary_op (INDIRECT_REF, TREE_TYPE (gnu_ret_val),
3544 DECL_ARGUMENTS (current_function_decl));
3546 gnu_lhs = DECL_RESULT (current_function_decl);
3548 /* Do not remove the padding from GNU_RET_VAL if the inner
3549 type is self-referential since we want to allocate the fixed
3550 size in that case. */
3551 if (TREE_CODE (gnu_ret_val) == COMPONENT_REF
3552 && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_ret_val, 0)))
3554 && (TYPE_IS_PADDING_P
3555 (TREE_TYPE (TREE_OPERAND (gnu_ret_val, 0))))
3556 && (CONTAINS_PLACEHOLDER_P
3557 (TYPE_SIZE (TREE_TYPE (gnu_ret_val)))))
3558 gnu_ret_val = TREE_OPERAND (gnu_ret_val, 0);
3560 if (TYPE_RETURNS_BY_REF_P (gnu_subprog_type)
3561 || By_Ref (gnat_node))
3563 = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_ret_val);
3565 else if (TYPE_RETURNS_UNCONSTRAINED_P (gnu_subprog_type))
3567 gnu_ret_val = maybe_unconstrained_array (gnu_ret_val);
3569 /* We have two cases: either the function returns with
3570 depressed stack or not. If not, we allocate on the
3571 secondary stack. If so, we allocate in the stack frame.
3572 if no copy is needed, the front end will set By_Ref,
3573 which we handle in the case above. */
3574 if (TYPE_RETURNS_STACK_DEPRESSED (gnu_subprog_type))
3576 = build_allocator (TREE_TYPE (gnu_ret_val),
3578 TREE_TYPE (gnu_subprog_type),
3582 = build_allocator (TREE_TYPE (gnu_ret_val),
3584 TREE_TYPE (gnu_subprog_type),
3585 Procedure_To_Call (gnat_node),
3586 Storage_Pool (gnat_node),
3593 gnu_result = build2 (MODIFY_EXPR, TREE_TYPE (gnu_ret_val),
3594 gnu_lhs, gnu_ret_val);
3596 if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type))
3598 add_stmt_with_node (gnu_result, gnat_node);
3599 gnu_result = NULL_TREE;
3602 gnu_result = build1 (RETURN_EXPR, void_type_node, gnu_result);
3606 case N_Goto_Statement:
3607 gnu_result = build1 (GOTO_EXPR, void_type_node,
3608 gnat_to_gnu (Name (gnat_node)));
3611 /****************************/
3612 /* Chapter 6: Subprograms: */
3613 /****************************/
3615 case N_Subprogram_Declaration:
3616 /* Unless there is a freeze node, declare the subprogram. We consider
3617 this a "definition" even though we're not generating code for
3618 the subprogram because we will be making the corresponding GCC
3621 if (No (Freeze_Node (Defining_Entity (Specification (gnat_node)))))
3622 gnat_to_gnu_entity (Defining_Entity (Specification (gnat_node)),
3624 gnu_result = alloc_stmt_list ();
3627 case N_Abstract_Subprogram_Declaration:
3628 /* This subprogram doesn't exist for code generation purposes, but we
3629 have to elaborate the types of any parameters, unless they are
3630 imported types (nothing to generate in this case). */
3632 = First_Formal (Defining_Entity (Specification (gnat_node)));
3633 Present (gnat_temp);
3634 gnat_temp = Next_Formal_With_Extras (gnat_temp))
3635 if (Is_Itype (Etype (gnat_temp))
3636 && !From_With_Type (Etype (gnat_temp)))
3637 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
3639 gnu_result = alloc_stmt_list ();
3642 case N_Defining_Program_Unit_Name:
3643 /* For a child unit identifier go up a level to get the
3644 specification. We get this when we try to find the spec of
3645 a child unit package that is the compilation unit being compiled. */
3646 gnu_result = gnat_to_gnu (Parent (gnat_node));
3649 case N_Subprogram_Body:
3650 Subprogram_Body_to_gnu (gnat_node);
3651 gnu_result = alloc_stmt_list ();
3654 case N_Function_Call:
3655 case N_Procedure_Call_Statement:
3656 gnu_result = call_to_gnu (gnat_node, &gnu_result_type, NULL_TREE);
3659 /*************************/
3660 /* Chapter 7: Packages: */
3661 /*************************/
3663 case N_Package_Declaration:
3664 gnu_result = gnat_to_gnu (Specification (gnat_node));
3667 case N_Package_Specification:
3669 start_stmt_group ();
3670 process_decls (Visible_Declarations (gnat_node),
3671 Private_Declarations (gnat_node), Empty, true, true);
3672 gnu_result = end_stmt_group ();
3675 case N_Package_Body:
3677 /* If this is the body of a generic package - do nothing */
3678 if (Ekind (Corresponding_Spec (gnat_node)) == E_Generic_Package)
3680 gnu_result = alloc_stmt_list ();
3684 start_stmt_group ();
3685 process_decls (Declarations (gnat_node), Empty, Empty, true, true);
3687 if (Present (Handled_Statement_Sequence (gnat_node)))
3688 add_stmt (gnat_to_gnu (Handled_Statement_Sequence (gnat_node)));
3690 gnu_result = end_stmt_group ();
3693 /*********************************/
3694 /* Chapter 8: Visibility Rules: */
3695 /*********************************/
3697 case N_Use_Package_Clause:
3698 case N_Use_Type_Clause:
3699 /* Nothing to do here - but these may appear in list of declarations */
3700 gnu_result = alloc_stmt_list ();
3703 /***********************/
3704 /* Chapter 9: Tasks: */
3705 /***********************/
3707 case N_Protected_Type_Declaration:
3708 gnu_result = alloc_stmt_list ();
3711 case N_Single_Task_Declaration:
3712 gnat_to_gnu_entity (Defining_Entity (gnat_node), NULL_TREE, 1);
3713 gnu_result = alloc_stmt_list ();
3716 /***********************************************************/
3717 /* Chapter 10: Program Structure and Compilation Issues: */
3718 /***********************************************************/
3720 case N_Compilation_Unit:
3722 /* This is not called for the main unit, which is handled in function
3724 start_stmt_group ();
3727 Compilation_Unit_to_gnu (gnat_node);
3728 gnu_result = alloc_stmt_list ();
3731 case N_Subprogram_Body_Stub:
3732 case N_Package_Body_Stub:
3733 case N_Protected_Body_Stub:
3734 case N_Task_Body_Stub:
3735 /* Simply process whatever unit is being inserted. */
3736 gnu_result = gnat_to_gnu (Unit (Library_Unit (gnat_node)));
3740 gnu_result = gnat_to_gnu (Proper_Body (gnat_node));
3743 /***************************/
3744 /* Chapter 11: Exceptions: */
3745 /***************************/
3747 case N_Handled_Sequence_Of_Statements:
3748 /* If there is an At_End procedure attached to this node, and the EH
3749 mechanism is SJLJ, we must have at least a corresponding At_End
3750 handler, unless the No_Exception_Handlers restriction is set. */
3751 gcc_assert (type_annotate_only
3752 || Exception_Mechanism != Setjmp_Longjmp
3753 || No (At_End_Proc (gnat_node))
3754 || Present (Exception_Handlers (gnat_node))
3755 || No_Exception_Handlers_Set ());
3757 gnu_result = Handled_Sequence_Of_Statements_to_gnu (gnat_node);
3760 case N_Exception_Handler:
3761 if (Exception_Mechanism == Setjmp_Longjmp)
3762 gnu_result = Exception_Handler_to_gnu_sjlj (gnat_node);
3763 else if (Exception_Mechanism == GCC_ZCX)
3764 gnu_result = Exception_Handler_to_gnu_zcx (gnat_node);
3770 /*******************************/
3771 /* Chapter 12: Generic Units: */
3772 /*******************************/
3774 case N_Generic_Function_Renaming_Declaration:
3775 case N_Generic_Package_Renaming_Declaration:
3776 case N_Generic_Procedure_Renaming_Declaration:
3777 case N_Generic_Package_Declaration:
3778 case N_Generic_Subprogram_Declaration:
3779 case N_Package_Instantiation:
3780 case N_Procedure_Instantiation:
3781 case N_Function_Instantiation:
3782 /* These nodes can appear on a declaration list but there is nothing to
3783 to be done with them. */
3784 gnu_result = alloc_stmt_list ();
3787 /***************************************************/
3788 /* Chapter 13: Representation Clauses and */
3789 /* Implementation-Dependent Features: */
3790 /***************************************************/
3792 case N_Attribute_Definition_Clause:
3794 gnu_result = alloc_stmt_list ();
3796 /* The only one we need deal with is for 'Address. For the others, SEM
3797 puts the information elsewhere. We need only deal with 'Address
3798 if the object has a Freeze_Node (which it never will currently). */
3799 if (Get_Attribute_Id (Chars (gnat_node)) != Attr_Address
3800 || No (Freeze_Node (Entity (Name (gnat_node)))))
3803 /* Get the value to use as the address and save it as the
3804 equivalent for GNAT_TEMP. When the object is frozen,
3805 gnat_to_gnu_entity will do the right thing. */
3806 save_gnu_tree (Entity (Name (gnat_node)),
3807 gnat_to_gnu (Expression (gnat_node)), true);
3810 case N_Enumeration_Representation_Clause:
3811 case N_Record_Representation_Clause:
3813 /* We do nothing with these. SEM puts the information elsewhere. */
3814 gnu_result = alloc_stmt_list ();
3817 case N_Code_Statement:
3818 if (!type_annotate_only)
3820 tree gnu_template = gnat_to_gnu (Asm_Template (gnat_node));
3821 tree gnu_input_list = NULL_TREE, gnu_output_list = NULL_TREE;
3822 tree gnu_clobber_list = NULL_TREE;
3825 /* First process inputs, then outputs, then clobbers. */
3826 Setup_Asm_Inputs (gnat_node);
3827 while (Present (gnat_temp = Asm_Input_Value ()))
3829 tree gnu_value = gnat_to_gnu (gnat_temp);
3830 tree gnu_constr = build_tree_list (NULL_TREE, gnat_to_gnu
3831 (Asm_Input_Constraint ()));
3834 = tree_cons (gnu_constr, gnu_value, gnu_input_list);
3838 Setup_Asm_Outputs (gnat_node);
3839 while (Present (gnat_temp = Asm_Output_Variable ()))
3841 tree gnu_value = gnat_to_gnu (gnat_temp);
3842 tree gnu_constr = build_tree_list (NULL_TREE, gnat_to_gnu
3843 (Asm_Output_Constraint ()));
3846 = tree_cons (gnu_constr, gnu_value, gnu_output_list);
3850 Clobber_Setup (gnat_node);
3851 while ((clobber = Clobber_Get_Next ()))
3853 = tree_cons (NULL_TREE,
3854 build_string (strlen (clobber) + 1, clobber),
3857 gnu_input_list = nreverse (gnu_input_list);
3858 gnu_output_list = nreverse (gnu_output_list);
3859 gnu_result = build4 (ASM_EXPR, void_type_node,
3860 gnu_template, gnu_output_list,
3861 gnu_input_list, gnu_clobber_list);
3862 ASM_VOLATILE_P (gnu_result) = Is_Asm_Volatile (gnat_node);
3865 gnu_result = alloc_stmt_list ();
3869 /***************************************************/
3871 /***************************************************/
3873 case N_Freeze_Entity:
3874 start_stmt_group ();
3875 process_freeze_entity (gnat_node);
3876 process_decls (Actions (gnat_node), Empty, Empty, true, true);
3877 gnu_result = end_stmt_group ();
3880 case N_Itype_Reference:
3881 if (!present_gnu_tree (Itype (gnat_node)))
3882 process_type (Itype (gnat_node));
3884 gnu_result = alloc_stmt_list ();
3887 case N_Free_Statement:
3888 if (!type_annotate_only)
3890 tree gnu_ptr = gnat_to_gnu (Expression (gnat_node));
3895 /* If this is a thin pointer, we must dereference it to create
3896 a fat pointer, then go back below to a thin pointer. The
3897 reason for this is that we need a fat pointer someplace in
3898 order to properly compute the size. */
3899 if (TYPE_THIN_POINTER_P (TREE_TYPE (gnu_ptr)))
3900 gnu_ptr = build_unary_op (ADDR_EXPR, NULL_TREE,
3901 build_unary_op (INDIRECT_REF, NULL_TREE,
3904 /* If this is an unconstrained array, we know the object must
3905 have been allocated with the template in front of the object.
3906 So pass the template address, but get the total size. Do this
3907 by converting to a thin pointer. */
3908 if (TYPE_FAT_POINTER_P (TREE_TYPE (gnu_ptr)))
3910 = convert (build_pointer_type
3911 (TYPE_OBJECT_RECORD_TYPE
3912 (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (gnu_ptr)))),
3915 gnu_obj_type = TREE_TYPE (TREE_TYPE (gnu_ptr));
3916 gnu_obj_size = TYPE_SIZE_UNIT (gnu_obj_type);
3917 align = TYPE_ALIGN (gnu_obj_type);
3919 if (TREE_CODE (gnu_obj_type) == RECORD_TYPE
3920 && TYPE_CONTAINS_TEMPLATE_P (gnu_obj_type))
3922 tree gnu_char_ptr_type = build_pointer_type (char_type_node);
3923 tree gnu_pos = byte_position (TYPE_FIELDS (gnu_obj_type));
3924 tree gnu_byte_offset
3925 = convert (gnu_char_ptr_type,
3926 size_diffop (size_zero_node, gnu_pos));
3928 gnu_ptr = convert (gnu_char_ptr_type, gnu_ptr);
3929 gnu_ptr = build_binary_op (MINUS_EXPR, gnu_char_ptr_type,
3930 gnu_ptr, gnu_byte_offset);
3933 gnu_result = build_call_alloc_dealloc (gnu_ptr, gnu_obj_size, align,
3934 Procedure_To_Call (gnat_node),
3935 Storage_Pool (gnat_node),
3940 case N_Raise_Constraint_Error:
3941 case N_Raise_Program_Error:
3942 case N_Raise_Storage_Error:
3943 if (type_annotate_only)
3945 gnu_result = alloc_stmt_list ();
3949 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3950 gnu_result = build_call_raise (UI_To_Int (Reason (gnat_node)));
3952 /* If the type is VOID, this is a statement, so we need to
3953 generate the code for the call. Handle a Condition, if there
3955 if (TREE_CODE (gnu_result_type) == VOID_TYPE)
3957 annotate_with_node (gnu_result, gnat_node);
3959 if (Present (Condition (gnat_node)))
3960 gnu_result = build3 (COND_EXPR, void_type_node,
3961 gnat_to_gnu (Condition (gnat_node)),
3962 gnu_result, alloc_stmt_list ());
3965 gnu_result = build1 (NULL_EXPR, gnu_result_type, gnu_result);
3968 case N_Validate_Unchecked_Conversion:
3969 /* If the result is a pointer type, see if we are either converting
3970 from a non-pointer or from a pointer to a type with a different
3971 alias set and warn if so. If the result defined in the same unit as
3972 this unchecked conversion, we can allow this because we can know to
3973 make that type have alias set 0. */
3975 tree gnu_source_type = gnat_to_gnu_type (Source_Type (gnat_node));
3976 tree gnu_target_type = gnat_to_gnu_type (Target_Type (gnat_node));
3978 if (POINTER_TYPE_P (gnu_target_type)
3979 && !In_Same_Source_Unit (Target_Type (gnat_node), gnat_node)
3980 && get_alias_set (TREE_TYPE (gnu_target_type)) != 0
3981 && !No_Strict_Aliasing (Underlying_Type (Target_Type (gnat_node)))
3982 && (!POINTER_TYPE_P (gnu_source_type)
3983 || (get_alias_set (TREE_TYPE (gnu_source_type))
3984 != get_alias_set (TREE_TYPE (gnu_target_type)))))
3987 ("?possible aliasing problem for type&",
3988 gnat_node, Target_Type (gnat_node));
3990 ("\\?use -fno-strict-aliasing switch for references",
3993 ("\\?or use `pragma No_Strict_Aliasing (&);`",
3994 gnat_node, Target_Type (gnat_node));
3997 /* The No_Strict_Aliasing flag is not propagated to the back-end for
3998 fat pointers so unconditionally warn in problematic cases. */
3999 else if (TYPE_FAT_POINTER_P (gnu_target_type))
4002 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (gnu_target_type)));
4004 if (get_alias_set (array_type) != 0
4005 && (!TYPE_FAT_POINTER_P (gnu_source_type)
4006 || (get_alias_set (TREE_TYPE (TREE_TYPE (TYPE_FIELDS (gnu_source_type))))
4007 != get_alias_set (array_type))))
4010 ("?possible aliasing problem for type&",
4011 gnat_node, Target_Type (gnat_node));
4013 ("\\?use -fno-strict-aliasing switch for references",
4018 gnu_result = alloc_stmt_list ();
4021 case N_Raise_Statement:
4022 case N_Function_Specification:
4023 case N_Procedure_Specification:
4025 case N_Component_Association:
4028 gcc_assert (type_annotate_only);
4029 gnu_result = alloc_stmt_list ();
4032 /* If we pushed our level as part of processing the elaboration routine,
4034 if (went_into_elab_proc)
4036 add_stmt (gnu_result);
4038 gnu_result = end_stmt_group ();
4039 current_function_decl = NULL_TREE;
4042 /* Set the location information into the result. Note that we may have
4043 no result if we tried to build a CALL_EXPR node to a procedure with
4044 no side-effects and optimization is enabled. */
4045 if (gnu_result && EXPR_P (gnu_result))
4046 annotate_with_node (gnu_result, gnat_node);
4048 /* If we're supposed to return something of void_type, it means we have
4049 something we're elaborating for effect, so just return. */
4050 if (TREE_CODE (gnu_result_type) == VOID_TYPE)
4053 /* If the result is a constant that overflows, raise constraint error. */
4054 else if (TREE_CODE (gnu_result) == INTEGER_CST
4055 && TREE_CONSTANT_OVERFLOW (gnu_result))
4057 post_error ("Constraint_Error will be raised at run-time?", gnat_node);
4060 = build1 (NULL_EXPR, gnu_result_type,
4061 build_call_raise (CE_Overflow_Check_Failed));
4064 /* If our result has side-effects and is of an unconstrained type,
4065 make a SAVE_EXPR so that we can be sure it will only be referenced
4066 once. Note we must do this before any conversions. */
4067 if (TREE_SIDE_EFFECTS (gnu_result)
4068 && (TREE_CODE (gnu_result_type) == UNCONSTRAINED_ARRAY_TYPE
4069 || CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_result_type))))
4070 gnu_result = gnat_stabilize_reference (gnu_result, 0);
4072 /* Now convert the result to the proper type. If the type is void or if
4073 we have no result, return error_mark_node to show we have no result.
4074 If the type of the result is correct or if we have a label (which doesn't
4075 have any well-defined type), return our result. Also don't do the
4076 conversion if the "desired" type involves a PLACEHOLDER_EXPR in its size
4077 since those are the cases where the front end may have the type wrong due
4078 to "instantiating" the unconstrained record with discriminant values
4079 or if this is a FIELD_DECL. If this is the Name of an assignment
4080 statement or a parameter of a procedure call, return what we have since
4081 the RHS has to be converted to our type there in that case, unless
4082 GNU_RESULT_TYPE has a simpler size. Similarly, if the two types are
4083 record types with the same name, the expression type has integral mode,
4084 and GNU_RESULT_TYPE BLKmode, don't convert. This will be the case when
4085 we are converting from a packable type to its actual type and we need
4086 those conversions to be NOPs in order for assignments into these types to
4087 work properly if the inner object is a bitfield and hence can't have
4088 its address taken. Finally, don't convert integral types that are the
4089 operand of an unchecked conversion since we need to ignore those
4090 conversions (for 'Valid). Otherwise, convert the result to the proper
4093 if (Present (Parent (gnat_node))
4094 && ((Nkind (Parent (gnat_node)) == N_Assignment_Statement
4095 && Name (Parent (gnat_node)) == gnat_node)
4096 || (Nkind (Parent (gnat_node)) == N_Procedure_Call_Statement
4097 && Name (Parent (gnat_node)) != gnat_node)
4098 || (Nkind (Parent (gnat_node)) == N_Unchecked_Type_Conversion
4099 && !AGGREGATE_TYPE_P (gnu_result_type)
4100 && !AGGREGATE_TYPE_P (TREE_TYPE (gnu_result)))
4101 || Nkind (Parent (gnat_node)) == N_Parameter_Association)
4102 && !(TYPE_SIZE (gnu_result_type)
4103 && TYPE_SIZE (TREE_TYPE (gnu_result))
4104 && (AGGREGATE_TYPE_P (gnu_result_type)
4105 == AGGREGATE_TYPE_P (TREE_TYPE (gnu_result)))
4106 && ((TREE_CODE (TYPE_SIZE (gnu_result_type)) == INTEGER_CST
4107 && (TREE_CODE (TYPE_SIZE (TREE_TYPE (gnu_result)))
4109 || (TREE_CODE (TYPE_SIZE (gnu_result_type)) != INTEGER_CST
4110 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_result_type))
4111 && (CONTAINS_PLACEHOLDER_P
4112 (TYPE_SIZE (TREE_TYPE (gnu_result))))))
4113 && !(TREE_CODE (gnu_result_type) == RECORD_TYPE
4114 && TYPE_JUSTIFIED_MODULAR_P (gnu_result_type))))
4116 /* In this case remove padding only if the inner object is of
4117 self-referential size: in that case it must be an object of
4118 unconstrained type with a default discriminant. In other cases,
4119 we want to avoid copying too much data. */
4120 if (TREE_CODE (TREE_TYPE (gnu_result)) == RECORD_TYPE
4121 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_result))
4122 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE
4123 (TREE_TYPE (TYPE_FIELDS
4124 (TREE_TYPE (gnu_result))))))
4125 gnu_result = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_result))),
4129 else if (TREE_CODE (gnu_result) == LABEL_DECL
4130 || TREE_CODE (gnu_result) == FIELD_DECL
4131 || TREE_CODE (gnu_result) == ERROR_MARK
4132 || (TYPE_SIZE (gnu_result_type)
4133 && TREE_CODE (TYPE_SIZE (gnu_result_type)) != INTEGER_CST
4134 && TREE_CODE (gnu_result) != INDIRECT_REF
4135 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_result_type)))
4136 || ((TYPE_NAME (gnu_result_type)
4137 == TYPE_NAME (TREE_TYPE (gnu_result)))
4138 && TREE_CODE (gnu_result_type) == RECORD_TYPE
4139 && TREE_CODE (TREE_TYPE (gnu_result)) == RECORD_TYPE
4140 && TYPE_MODE (gnu_result_type) == BLKmode
4141 && (GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (gnu_result)))
4144 /* Remove any padding record, but do nothing more in this case. */
4145 if (TREE_CODE (TREE_TYPE (gnu_result)) == RECORD_TYPE
4146 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_result)))
4147 gnu_result = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_result))),
4151 else if (gnu_result == error_mark_node
4152 || gnu_result_type == void_type_node)
4153 gnu_result = error_mark_node;
4154 else if (gnu_result_type != TREE_TYPE (gnu_result))
4155 gnu_result = convert (gnu_result_type, gnu_result);
4157 /* We don't need any NOP_EXPR or NON_LVALUE_EXPR on GNU_RESULT. */
4158 while ((TREE_CODE (gnu_result) == NOP_EXPR
4159 || TREE_CODE (gnu_result) == NON_LVALUE_EXPR)
4160 && TREE_TYPE (TREE_OPERAND (gnu_result, 0)) == TREE_TYPE (gnu_result))
4161 gnu_result = TREE_OPERAND (gnu_result, 0);
4166 /* Record the current code position in GNAT_NODE. */
4169 record_code_position (Node_Id gnat_node)
4171 tree stmt_stmt = build1 (STMT_STMT, void_type_node, NULL_TREE);
4173 add_stmt_with_node (stmt_stmt, gnat_node);
4174 save_gnu_tree (gnat_node, stmt_stmt, true);
4177 /* Insert the code for GNAT_NODE at the position saved for that node. */
4180 insert_code_for (Node_Id gnat_node)
4182 STMT_STMT_STMT (get_gnu_tree (gnat_node)) = gnat_to_gnu (gnat_node);
4183 save_gnu_tree (gnat_node, NULL_TREE, true);
4186 /* Start a new statement group chained to the previous group. */
4191 struct stmt_group *group = stmt_group_free_list;
4193 /* First see if we can get one from the free list. */
4195 stmt_group_free_list = group->previous;
4197 group = (struct stmt_group *) ggc_alloc (sizeof (struct stmt_group));
4199 group->previous = current_stmt_group;
4200 group->stmt_list = group->block = group->cleanups = NULL_TREE;
4201 current_stmt_group = group;
4204 /* Add GNU_STMT to the current statement group. */
4207 add_stmt (tree gnu_stmt)
4209 append_to_statement_list (gnu_stmt, ¤t_stmt_group->stmt_list);
4211 /* If we're at top level, show everything in here is in use in case
4212 any of it is shared by a subprogram. */
4213 if (global_bindings_p ())
4214 walk_tree (&gnu_stmt, mark_visited, NULL, NULL);
4218 /* Similar, but set the location of GNU_STMT to that of GNAT_NODE. */
4221 add_stmt_with_node (tree gnu_stmt, Node_Id gnat_node)
4223 if (Present (gnat_node))
4224 annotate_with_node (gnu_stmt, gnat_node);
4225 add_stmt (gnu_stmt);
4228 /* Add a declaration statement for GNU_DECL to the current statement group.
4229 Get SLOC from Entity_Id. */
4232 add_decl_expr (tree gnu_decl, Entity_Id gnat_entity)
4236 /* If this is a variable that Gigi is to ignore, we may have been given
4237 an ERROR_MARK. So test for it. We also might have been given a
4238 reference for a renaming. So only do something for a decl. Also
4239 ignore a TYPE_DECL for an UNCONSTRAINED_ARRAY_TYPE. */
4240 if (!DECL_P (gnu_decl)
4241 || (TREE_CODE (gnu_decl) == TYPE_DECL
4242 && TREE_CODE (TREE_TYPE (gnu_decl)) == UNCONSTRAINED_ARRAY_TYPE))
4245 /* If we are global, we don't want to actually output the DECL_EXPR for
4246 this decl since we already have evaluated the expressions in the
4247 sizes and positions as globals and doing it again would be wrong.
4248 But we do have to mark everything as used. */
4249 gnu_stmt = build1 (DECL_EXPR, void_type_node, gnu_decl);
4250 if (!global_bindings_p ())
4251 add_stmt_with_node (gnu_stmt, gnat_entity);
4254 walk_tree (&gnu_stmt, mark_visited, NULL, NULL);
4255 if (TREE_CODE (gnu_decl) == VAR_DECL
4256 || TREE_CODE (gnu_decl) == CONST_DECL)
4258 walk_tree (&DECL_SIZE (gnu_decl), mark_visited, NULL, NULL);
4259 walk_tree (&DECL_SIZE_UNIT (gnu_decl), mark_visited, NULL, NULL);
4260 walk_tree (&DECL_INITIAL (gnu_decl), mark_visited, NULL, NULL);
4264 /* If this is a DECL_EXPR for a variable with DECL_INITIAL set,
4265 there are two cases we need to handle here. */
4266 if (TREE_CODE (gnu_decl) == VAR_DECL && DECL_INITIAL (gnu_decl))
4268 tree gnu_init = DECL_INITIAL (gnu_decl);
4269 tree gnu_lhs = NULL_TREE;
4271 /* If this is a DECL_EXPR for a variable with DECL_INITIAL set
4272 and decl has a padded type, convert it to the unpadded type so the
4273 assignment is done properly. */
4274 if (TREE_CODE (TREE_TYPE (gnu_decl)) == RECORD_TYPE
4275 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_decl)))
4277 = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_decl))), gnu_decl);
4279 /* Otherwise, if this is going into memory and the initializer isn't
4280 valid for the assembler and loader. Gimplification could do this,
4281 but would be run too late if -fno-unit-at-a-time. */
4282 else if (TREE_STATIC (gnu_decl)
4283 && !initializer_constant_valid_p (gnu_init,
4284 TREE_TYPE (gnu_decl)))
4289 tree gnu_assign_stmt
4290 = build_binary_op (MODIFY_EXPR, NULL_TREE,
4291 gnu_lhs, DECL_INITIAL (gnu_decl));
4293 DECL_INITIAL (gnu_decl) = 0;
4294 TREE_READONLY (gnu_decl) = 0;
4295 annotate_with_locus (gnu_assign_stmt,
4296 DECL_SOURCE_LOCATION (gnu_decl));
4297 add_stmt (gnu_assign_stmt);
4302 /* Utility function to mark nodes with TREE_VISITED and types as having their
4303 sized gimplified. Called from walk_tree. We use this to indicate all
4304 variable sizes and positions in global types may not be shared by any
4308 mark_visited (tree *tp, int *walk_subtrees, void *data ATTRIBUTE_UNUSED)
4310 if (TREE_VISITED (*tp))
4313 /* Don't mark a dummy type as visited because we want to mark its sizes
4314 and fields once it's filled in. */
4315 else if (!TYPE_IS_DUMMY_P (*tp))
4316 TREE_VISITED (*tp) = 1;
4319 TYPE_SIZES_GIMPLIFIED (*tp) = 1;
4324 /* Likewise, but to mark as unvisited. */
4327 mark_unvisited (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
4328 void *data ATTRIBUTE_UNUSED)
4330 TREE_VISITED (*tp) = 0;
4335 /* Add GNU_CLEANUP, a cleanup action, to the current code group. */
4338 add_cleanup (tree gnu_cleanup)
4340 append_to_statement_list (gnu_cleanup, ¤t_stmt_group->cleanups);
4343 /* Set the BLOCK node corresponding to the current code group to GNU_BLOCK. */
4346 set_block_for_group (tree gnu_block)
4348 gcc_assert (!current_stmt_group->block);
4349 current_stmt_group->block = gnu_block;
4352 /* Return code corresponding to the current code group. It is normally
4353 a STATEMENT_LIST, but may also be a BIND_EXPR or TRY_FINALLY_EXPR if
4354 BLOCK or cleanups were set. */
4359 struct stmt_group *group = current_stmt_group;
4360 tree gnu_retval = group->stmt_list;
4362 /* If this is a null list, allocate a new STATEMENT_LIST. Then, if there
4363 are cleanups, make a TRY_FINALLY_EXPR. Last, if there is a BLOCK,
4364 make a BIND_EXPR. Note that we nest in that because the cleanup may
4365 reference variables in the block. */
4366 if (gnu_retval == NULL_TREE)
4367 gnu_retval = alloc_stmt_list ();
4369 if (group->cleanups)
4370 gnu_retval = build2 (TRY_FINALLY_EXPR, void_type_node, gnu_retval,
4373 if (current_stmt_group->block)
4374 gnu_retval = build3 (BIND_EXPR, void_type_node, BLOCK_VARS (group->block),
4375 gnu_retval, group->block);
4377 /* Remove this group from the stack and add it to the free list. */
4378 current_stmt_group = group->previous;
4379 group->previous = stmt_group_free_list;
4380 stmt_group_free_list = group;
4385 /* Add a list of statements from GNAT_LIST, a possibly-empty list of
4389 add_stmt_list (List_Id gnat_list)
4393 if (Present (gnat_list))
4394 for (gnat_node = First (gnat_list); Present (gnat_node);
4395 gnat_node = Next (gnat_node))
4396 add_stmt (gnat_to_gnu (gnat_node));
4399 /* Build a tree from GNAT_LIST, a possibly-empty list of statements.
4400 If BINDING_P is true, push and pop a binding level around the list. */
4403 build_stmt_group (List_Id gnat_list, bool binding_p)
4405 start_stmt_group ();
4409 add_stmt_list (gnat_list);
4413 return end_stmt_group ();
4416 /* Push and pop routines for stacks. We keep a free list around so we
4417 don't waste tree nodes. */
4420 push_stack (tree *gnu_stack_ptr, tree gnu_purpose, tree gnu_value)
4422 tree gnu_node = gnu_stack_free_list;
4426 gnu_stack_free_list = TREE_CHAIN (gnu_node);
4427 TREE_CHAIN (gnu_node) = *gnu_stack_ptr;
4428 TREE_PURPOSE (gnu_node) = gnu_purpose;
4429 TREE_VALUE (gnu_node) = gnu_value;
4432 gnu_node = tree_cons (gnu_purpose, gnu_value, *gnu_stack_ptr);
4434 *gnu_stack_ptr = gnu_node;
4438 pop_stack (tree *gnu_stack_ptr)
4440 tree gnu_node = *gnu_stack_ptr;
4442 *gnu_stack_ptr = TREE_CHAIN (gnu_node);
4443 TREE_CHAIN (gnu_node) = gnu_stack_free_list;
4444 gnu_stack_free_list = gnu_node;
4447 /* GNU_STMT is a statement. We generate code for that statement. */
4450 gnat_expand_stmt (tree gnu_stmt)
4453 tree gnu_elmt, gnu_elmt_2;
4456 switch (TREE_CODE (gnu_stmt))
4460 /* First write a volatile ASM_INPUT to prevent anything from being
4462 gnu_elmt = gen_rtx_ASM_INPUT (VOIDmode, "");
4463 MEM_VOLATILE_P (gnu_elmt) = 1;
4464 emit_insn (gnu_elmt);
4466 gnu_elmt = expand_expr (TREE_OPERAND (gnu_stmt, 0), NULL_RTX, VOIDmode,
4468 emit_insn (gen_rtx_USE (VOIDmode, ));
4477 /* Generate GIMPLE in place for the expression at *EXPR_P. */
4480 gnat_gimplify_expr (tree *expr_p, tree *pre_p, tree *post_p ATTRIBUTE_UNUSED)
4482 tree expr = *expr_p;
4484 if (IS_ADA_STMT (expr))
4485 return gnat_gimplify_stmt (expr_p);
4487 switch (TREE_CODE (expr))
4490 /* If this is for a scalar, just make a VAR_DECL for it. If for
4491 an aggregate, get a null pointer of the appropriate type and
4493 if (AGGREGATE_TYPE_P (TREE_TYPE (expr)))
4494 *expr_p = build1 (INDIRECT_REF, TREE_TYPE (expr),
4495 convert (build_pointer_type (TREE_TYPE (expr)),
4496 integer_zero_node));
4499 *expr_p = create_tmp_var (TREE_TYPE (expr), NULL);
4500 TREE_NO_WARNING (*expr_p) = 1;
4503 append_to_statement_list (TREE_OPERAND (expr, 0), pre_p);
4506 case UNCONSTRAINED_ARRAY_REF:
4507 /* We should only do this if we are just elaborating for side-effects,
4508 but we can't know that yet. */
4509 *expr_p = TREE_OPERAND (*expr_p, 0);
4513 /* If we're taking the address of a constant CONSTRUCTOR, force it to
4514 be put into static memory. We know it's going to be readonly given
4515 the semantics we have and it's required to be static memory in
4516 the case when the reference is in an elaboration procedure. */
4517 if (TREE_CODE (TREE_OPERAND (expr, 0)) == CONSTRUCTOR
4518 && TREE_CONSTANT (TREE_OPERAND (expr, 0)))
4521 = create_tmp_var (TREE_TYPE (TREE_OPERAND (expr, 0)), "C");
4523 TREE_READONLY (new_var) = 1;
4524 TREE_STATIC (new_var) = 1;
4525 TREE_ADDRESSABLE (new_var) = 1;
4526 DECL_INITIAL (new_var) = TREE_OPERAND (expr, 0);
4528 TREE_OPERAND (expr, 0) = new_var;
4529 recompute_tree_invarant_for_addr_expr (expr);
4532 return GS_UNHANDLED;
4535 /* We have a kludge here. If the FIELD_DECL is from a fat pointer and is
4536 from an early dummy type, replace it with the proper FIELD_DECL. */
4537 if (TYPE_FAT_POINTER_P (TREE_TYPE (TREE_OPERAND (*expr_p, 0)))
4538 && DECL_ORIGINAL_FIELD (TREE_OPERAND (*expr_p, 1)))
4540 TREE_OPERAND (*expr_p, 1)
4541 = DECL_ORIGINAL_FIELD (TREE_OPERAND (*expr_p, 1));
4545 /* ... fall through ... */
4548 return GS_UNHANDLED;
4552 /* Generate GIMPLE in place for the statement at *STMT_P. */
4554 static enum gimplify_status
4555 gnat_gimplify_stmt (tree *stmt_p)
4557 tree stmt = *stmt_p;
4559 switch (TREE_CODE (stmt))
4562 *stmt_p = STMT_STMT_STMT (stmt);
4566 *stmt_p = NULL_TREE;
4571 tree gnu_start_label = create_artificial_label ();
4572 tree gnu_end_label = LOOP_STMT_LABEL (stmt);
4574 /* Set to emit the statements of the loop. */
4575 *stmt_p = NULL_TREE;
4577 /* We first emit the start label and then a conditional jump to
4578 the end label if there's a top condition, then the body of the
4579 loop, then a conditional branch to the end label, then the update,
4580 if any, and finally a jump to the start label and the definition
4581 of the end label. */
4582 append_to_statement_list (build1 (LABEL_EXPR, void_type_node,
4586 if (LOOP_STMT_TOP_COND (stmt))
4587 append_to_statement_list (build3 (COND_EXPR, void_type_node,
4588 LOOP_STMT_TOP_COND (stmt),
4595 append_to_statement_list (LOOP_STMT_BODY (stmt), stmt_p);
4597 if (LOOP_STMT_BOT_COND (stmt))
4598 append_to_statement_list (build3 (COND_EXPR, void_type_node,
4599 LOOP_STMT_BOT_COND (stmt),
4606 if (LOOP_STMT_UPDATE (stmt))
4607 append_to_statement_list (LOOP_STMT_UPDATE (stmt), stmt_p);
4609 append_to_statement_list (build1 (GOTO_EXPR, void_type_node,
4612 append_to_statement_list (build1 (LABEL_EXPR, void_type_node,
4619 /* Build a statement to jump to the corresponding end label, then
4620 see if it needs to be conditional. */
4621 *stmt_p = build1 (GOTO_EXPR, void_type_node, EXIT_STMT_LABEL (stmt));
4622 if (EXIT_STMT_COND (stmt))
4623 *stmt_p = build3 (COND_EXPR, void_type_node,
4624 EXIT_STMT_COND (stmt), *stmt_p, alloc_stmt_list ());
4632 /* Force references to each of the entities in packages GNAT_NODE with's
4633 so that the debugging information for all of them are identical
4634 in all clients. Operate recursively on anything it with's, but check
4635 that we aren't elaborating something more than once. */
4637 /* The reason for this routine's existence is two-fold.
4638 First, with some debugging formats, notably MDEBUG on SGI
4639 IRIX, the linker will remove duplicate debugging information if two
4640 clients have identical debugguing information. With the normal scheme
4641 of elaboration, this does not usually occur, since entities in with'ed
4642 packages are elaborated on demand, and if clients have different usage
4643 patterns, the normal case, then the order and selection of entities
4644 will differ. In most cases however, it seems that linkers do not know
4645 how to eliminate duplicate debugging information, even if it is
4646 identical, so the use of this routine would increase the total amount
4647 of debugging information in the final executable.
4649 Second, this routine is called in type_annotate mode, to compute DDA
4650 information for types in withed units, for ASIS use */
4653 elaborate_all_entities (Node_Id gnat_node)
4655 Entity_Id gnat_with_clause, gnat_entity;
4657 /* Process each unit only once. As we trace the context of all relevant
4658 units transitively, including generic bodies, we may encounter the
4659 same generic unit repeatedly */
4661 if (!present_gnu_tree (gnat_node))
4662 save_gnu_tree (gnat_node, integer_zero_node, true);
4664 /* Save entities in all context units. A body may have an implicit_with
4665 on its own spec, if the context includes a child unit, so don't save
4668 for (gnat_with_clause = First (Context_Items (gnat_node));
4669 Present (gnat_with_clause);
4670 gnat_with_clause = Next (gnat_with_clause))
4671 if (Nkind (gnat_with_clause) == N_With_Clause
4672 && !present_gnu_tree (Library_Unit (gnat_with_clause))
4673 && Library_Unit (gnat_with_clause) != Library_Unit (Cunit (Main_Unit)))
4675 elaborate_all_entities (Library_Unit (gnat_with_clause));
4677 if (Ekind (Entity (Name (gnat_with_clause))) == E_Package)
4679 for (gnat_entity = First_Entity (Entity (Name (gnat_with_clause)));
4680 Present (gnat_entity);
4681 gnat_entity = Next_Entity (gnat_entity))
4682 if (Is_Public (gnat_entity)
4683 && Convention (gnat_entity) != Convention_Intrinsic
4684 && Ekind (gnat_entity) != E_Package
4685 && Ekind (gnat_entity) != E_Package_Body
4686 && Ekind (gnat_entity) != E_Operator
4687 && !(IN (Ekind (gnat_entity), Type_Kind)
4688 && !Is_Frozen (gnat_entity))
4689 && !((Ekind (gnat_entity) == E_Procedure
4690 || Ekind (gnat_entity) == E_Function)
4691 && Is_Intrinsic_Subprogram (gnat_entity))
4692 && !IN (Ekind (gnat_entity), Named_Kind)
4693 && !IN (Ekind (gnat_entity), Generic_Unit_Kind))
4694 gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
4696 else if (Ekind (Entity (Name (gnat_with_clause))) == E_Generic_Package)
4699 = Corresponding_Body (Unit (Library_Unit (gnat_with_clause)));
4701 /* Retrieve compilation unit node of generic body. */
4702 while (Present (gnat_body)
4703 && Nkind (gnat_body) != N_Compilation_Unit)
4704 gnat_body = Parent (gnat_body);
4706 /* If body is available, elaborate its context. */
4707 if (Present (gnat_body))
4708 elaborate_all_entities (gnat_body);
4712 if (Nkind (Unit (gnat_node)) == N_Package_Body && type_annotate_only)
4713 elaborate_all_entities (Library_Unit (gnat_node));
4716 /* Do the processing of N_Freeze_Entity, GNAT_NODE. */
4719 process_freeze_entity (Node_Id gnat_node)
4721 Entity_Id gnat_entity = Entity (gnat_node);
4725 = (Nkind (Declaration_Node (gnat_entity)) == N_Object_Declaration
4726 && present_gnu_tree (Declaration_Node (gnat_entity)))
4727 ? get_gnu_tree (Declaration_Node (gnat_entity)) : NULL_TREE;
4729 /* If this is a package, need to generate code for the package. */
4730 if (Ekind (gnat_entity) == E_Package)
4733 (Parent (Corresponding_Body
4734 (Parent (Declaration_Node (gnat_entity)))));
4738 /* Check for old definition after the above call. This Freeze_Node
4739 might be for one its Itypes. */
4741 = present_gnu_tree (gnat_entity) ? get_gnu_tree (gnat_entity) : 0;
4743 /* If this entity has an Address representation clause, GNU_OLD is the
4744 address, so discard it here. */
4745 if (Present (Address_Clause (gnat_entity)))
4748 /* Don't do anything for class-wide types they are always
4749 transformed into their root type. */
4750 if (Ekind (gnat_entity) == E_Class_Wide_Type
4751 || (Ekind (gnat_entity) == E_Class_Wide_Subtype
4752 && Present (Equivalent_Type (gnat_entity))))
4755 /* Don't do anything for subprograms that may have been elaborated before
4756 their freeze nodes. This can happen, for example because of an inner call
4757 in an instance body. */
4759 && TREE_CODE (gnu_old) == FUNCTION_DECL
4760 && (Ekind (gnat_entity) == E_Function
4761 || Ekind (gnat_entity) == E_Procedure))
4764 /* If we have a non-dummy type old tree, we have nothing to do. Unless
4765 this is the public view of a private type whose full view was not
4766 delayed, this node was never delayed as it should have been.
4767 Also allow this to happen for concurrent types since we may have
4768 frozen both the Corresponding_Record_Type and this type. */
4770 && !(TREE_CODE (gnu_old) == TYPE_DECL
4771 && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_old))))
4773 gcc_assert ((IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
4774 && Present (Full_View (gnat_entity))
4775 && No (Freeze_Node (Full_View (gnat_entity))))
4776 || Is_Concurrent_Type (gnat_entity));
4780 /* Reset the saved tree, if any, and elaborate the object or type for real.
4781 If there is a full declaration, elaborate it and copy the type to
4782 GNAT_ENTITY. Likewise if this is the record subtype corresponding to
4783 a class wide type or subtype. */
4786 save_gnu_tree (gnat_entity, NULL_TREE, false);
4787 if (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
4788 && Present (Full_View (gnat_entity))
4789 && present_gnu_tree (Full_View (gnat_entity)))
4790 save_gnu_tree (Full_View (gnat_entity), NULL_TREE, false);
4791 if (Present (Class_Wide_Type (gnat_entity))
4792 && Class_Wide_Type (gnat_entity) != gnat_entity)
4793 save_gnu_tree (Class_Wide_Type (gnat_entity), NULL_TREE, false);
4796 if (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
4797 && Present (Full_View (gnat_entity)))
4799 gnu_new = gnat_to_gnu_entity (Full_View (gnat_entity), NULL_TREE, 1);
4801 /* The above call may have defined this entity (the simplest example
4802 of this is when we have a private enumeral type since the bounds
4803 will have the public view. */
4804 if (!present_gnu_tree (gnat_entity))
4805 save_gnu_tree (gnat_entity, gnu_new, false);
4806 if (Present (Class_Wide_Type (gnat_entity))
4807 && Class_Wide_Type (gnat_entity) != gnat_entity)
4808 save_gnu_tree (Class_Wide_Type (gnat_entity), gnu_new, false);
4811 gnu_new = gnat_to_gnu_entity (gnat_entity, gnu_init, 1);
4813 /* If we've made any pointers to the old version of this type, we
4814 have to update them. */
4816 update_pointer_to (TYPE_MAIN_VARIANT (TREE_TYPE (gnu_old)),
4817 TREE_TYPE (gnu_new));
4820 /* Process the list of inlined subprograms of GNAT_NODE, which is an
4821 N_Compilation_Unit. */
4824 process_inlined_subprograms (Node_Id gnat_node)
4826 Entity_Id gnat_entity;
4829 /* If we can inline, generate RTL for all the inlined subprograms.
4830 Define the entity first so we set DECL_EXTERNAL. */
4831 if (optimize > 0 && !flag_really_no_inline)
4832 for (gnat_entity = First_Inlined_Subprogram (gnat_node);
4833 Present (gnat_entity);
4834 gnat_entity = Next_Inlined_Subprogram (gnat_entity))
4836 gnat_body = Parent (Declaration_Node (gnat_entity));
4838 if (Nkind (gnat_body) != N_Subprogram_Body)
4840 /* ??? This really should always be Present. */
4841 if (No (Corresponding_Body (gnat_body)))
4845 = Parent (Declaration_Node (Corresponding_Body (gnat_body)));
4848 if (Present (gnat_body))
4850 gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
4851 add_stmt (gnat_to_gnu (gnat_body));
4856 /* Elaborate decls in the lists GNAT_DECLS and GNAT_DECLS2, if present.
4857 We make two passes, one to elaborate anything other than bodies (but
4858 we declare a function if there was no spec). The second pass
4859 elaborates the bodies.
4861 GNAT_END_LIST gives the element in the list past the end. Normally,
4862 this is Empty, but can be First_Real_Statement for a
4863 Handled_Sequence_Of_Statements.
4865 We make a complete pass through both lists if PASS1P is true, then make
4866 the second pass over both lists if PASS2P is true. The lists usually
4867 correspond to the public and private parts of a package. */
4870 process_decls (List_Id gnat_decls, List_Id gnat_decls2,
4871 Node_Id gnat_end_list, bool pass1p, bool pass2p)
4873 List_Id gnat_decl_array[2];
4877 gnat_decl_array[0] = gnat_decls, gnat_decl_array[1] = gnat_decls2;
4880 for (i = 0; i <= 1; i++)
4881 if (Present (gnat_decl_array[i]))
4882 for (gnat_decl = First (gnat_decl_array[i]);
4883 gnat_decl != gnat_end_list; gnat_decl = Next (gnat_decl))
4885 /* For package specs, we recurse inside the declarations,
4886 thus taking the two pass approach inside the boundary. */
4887 if (Nkind (gnat_decl) == N_Package_Declaration
4888 && (Nkind (Specification (gnat_decl)
4889 == N_Package_Specification)))
4890 process_decls (Visible_Declarations (Specification (gnat_decl)),
4891 Private_Declarations (Specification (gnat_decl)),
4892 Empty, true, false);
4894 /* Similarly for any declarations in the actions of a
4896 else if (Nkind (gnat_decl) == N_Freeze_Entity)
4898 process_freeze_entity (gnat_decl);
4899 process_decls (Actions (gnat_decl), Empty, Empty, true, false);
4902 /* Package bodies with freeze nodes get their elaboration deferred
4903 until the freeze node, but the code must be placed in the right
4904 place, so record the code position now. */
4905 else if (Nkind (gnat_decl) == N_Package_Body
4906 && Present (Freeze_Node (Corresponding_Spec (gnat_decl))))
4907 record_code_position (gnat_decl);
4909 else if (Nkind (gnat_decl) == N_Package_Body_Stub
4910 && Present (Library_Unit (gnat_decl))
4911 && Present (Freeze_Node
4914 (Library_Unit (gnat_decl)))))))
4915 record_code_position
4916 (Proper_Body (Unit (Library_Unit (gnat_decl))));
4918 /* We defer most subprogram bodies to the second pass. */
4919 else if (Nkind (gnat_decl) == N_Subprogram_Body)
4921 if (Acts_As_Spec (gnat_decl))
4923 Node_Id gnat_subprog_id = Defining_Entity (gnat_decl);
4925 if (Ekind (gnat_subprog_id) != E_Generic_Procedure
4926 && Ekind (gnat_subprog_id) != E_Generic_Function)
4927 gnat_to_gnu_entity (gnat_subprog_id, NULL_TREE, 1);
4930 /* For bodies and stubs that act as their own specs, the entity
4931 itself must be elaborated in the first pass, because it may
4932 be used in other declarations. */
4933 else if (Nkind (gnat_decl) == N_Subprogram_Body_Stub)
4935 Node_Id gnat_subprog_id =
4936 Defining_Entity (Specification (gnat_decl));
4938 if (Ekind (gnat_subprog_id) != E_Subprogram_Body
4939 && Ekind (gnat_subprog_id) != E_Generic_Procedure
4940 && Ekind (gnat_subprog_id) != E_Generic_Function)
4941 gnat_to_gnu_entity (gnat_subprog_id, NULL_TREE, 1);
4944 /* Concurrent stubs stand for the corresponding subprogram bodies,
4945 which are deferred like other bodies. */
4946 else if (Nkind (gnat_decl) == N_Task_Body_Stub
4947 || Nkind (gnat_decl) == N_Protected_Body_Stub)
4950 add_stmt (gnat_to_gnu (gnat_decl));
4953 /* Here we elaborate everything we deferred above except for package bodies,
4954 which are elaborated at their freeze nodes. Note that we must also
4955 go inside things (package specs and freeze nodes) the first pass did. */
4957 for (i = 0; i <= 1; i++)
4958 if (Present (gnat_decl_array[i]))
4959 for (gnat_decl = First (gnat_decl_array[i]);
4960 gnat_decl != gnat_end_list; gnat_decl = Next (gnat_decl))
4962 if (Nkind (gnat_decl) == N_Subprogram_Body
4963 || Nkind (gnat_decl) == N_Subprogram_Body_Stub
4964 || Nkind (gnat_decl) == N_Task_Body_Stub
4965 || Nkind (gnat_decl) == N_Protected_Body_Stub)
4966 add_stmt (gnat_to_gnu (gnat_decl));
4968 else if (Nkind (gnat_decl) == N_Package_Declaration
4969 && (Nkind (Specification (gnat_decl)
4970 == N_Package_Specification)))
4971 process_decls (Visible_Declarations (Specification (gnat_decl)),
4972 Private_Declarations (Specification (gnat_decl)),
4973 Empty, false, true);
4975 else if (Nkind (gnat_decl) == N_Freeze_Entity)
4976 process_decls (Actions (gnat_decl), Empty, Empty, false, true);
4980 /* Emit code for a range check. GNU_EXPR is the expression to be checked,
4981 GNAT_RANGE_TYPE the gnat type or subtype containing the bounds against
4982 which we have to check. */
4985 emit_range_check (tree gnu_expr, Entity_Id gnat_range_type)
4987 tree gnu_range_type = get_unpadded_type (gnat_range_type);
4988 tree gnu_low = TYPE_MIN_VALUE (gnu_range_type);
4989 tree gnu_high = TYPE_MAX_VALUE (gnu_range_type);
4990 tree gnu_compare_type = get_base_type (TREE_TYPE (gnu_expr));
4992 /* If GNU_EXPR has an integral type that is narrower than GNU_RANGE_TYPE,
4993 we can't do anything since we might be truncating the bounds. No
4994 check is needed in this case. */
4995 if (INTEGRAL_TYPE_P (TREE_TYPE (gnu_expr))
4996 && (TYPE_PRECISION (gnu_compare_type)
4997 < TYPE_PRECISION (get_base_type (gnu_range_type))))
5000 /* Checked expressions must be evaluated only once. */
5001 gnu_expr = protect_multiple_eval (gnu_expr);
5003 /* There's no good type to use here, so we might as well use
5004 integer_type_node. Note that the form of the check is
5005 (not (expr >= lo)) or (not (expr >= hi))
5006 the reason for this slightly convoluted form is that NaN's
5007 are not considered to be in range in the float case. */
5009 (build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
5011 (build_binary_op (GE_EXPR, integer_type_node,
5012 convert (gnu_compare_type, gnu_expr),
5013 convert (gnu_compare_type, gnu_low))),
5015 (build_binary_op (LE_EXPR, integer_type_node,
5016 convert (gnu_compare_type, gnu_expr),
5017 convert (gnu_compare_type,
5019 gnu_expr, CE_Range_Check_Failed);
5022 /* Emit code for an index check. GNU_ARRAY_OBJECT is the array object
5023 which we are about to index, GNU_EXPR is the index expression to be
5024 checked, GNU_LOW and GNU_HIGH are the lower and upper bounds
5025 against which GNU_EXPR has to be checked. Note that for index
5026 checking we cannot use the emit_range_check function (although very
5027 similar code needs to be generated in both cases) since for index
5028 checking the array type against which we are checking the indeces
5029 may be unconstrained and consequently we need to retrieve the
5030 actual index bounds from the array object itself
5031 (GNU_ARRAY_OBJECT). The place where we need to do that is in
5032 subprograms having unconstrained array formal parameters */
5035 emit_index_check (tree gnu_array_object,
5040 tree gnu_expr_check;
5042 /* Checked expressions must be evaluated only once. */
5043 gnu_expr = protect_multiple_eval (gnu_expr);
5045 /* Must do this computation in the base type in case the expression's
5046 type is an unsigned subtypes. */
5047 gnu_expr_check = convert (get_base_type (TREE_TYPE (gnu_expr)), gnu_expr);
5049 /* If GNU_LOW or GNU_HIGH are a PLACEHOLDER_EXPR, qualify them by
5050 the object we are handling. */
5051 gnu_low = SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_low, gnu_array_object);
5052 gnu_high = SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_high, gnu_array_object);
5054 /* There's no good type to use here, so we might as well use
5055 integer_type_node. */
5057 (build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
5058 build_binary_op (LT_EXPR, integer_type_node,
5060 convert (TREE_TYPE (gnu_expr_check),
5062 build_binary_op (GT_EXPR, integer_type_node,
5064 convert (TREE_TYPE (gnu_expr_check),
5066 gnu_expr, CE_Index_Check_Failed);
5069 /* GNU_COND contains the condition corresponding to an access, discriminant or
5070 range check of value GNU_EXPR. Build a COND_EXPR that returns GNU_EXPR if
5071 GNU_COND is false and raises a CONSTRAINT_ERROR if GNU_COND is true.
5072 REASON is the code that says why the exception was raised. */
5075 emit_check (tree gnu_cond, tree gnu_expr, int reason)
5080 gnu_call = build_call_raise (reason);
5082 /* Use an outer COMPOUND_EXPR to make sure that GNU_EXPR will get evaluated
5083 in front of the comparison in case it ends up being a SAVE_EXPR. Put the
5084 whole thing inside its own SAVE_EXPR so the inner SAVE_EXPR doesn't leak
5086 gnu_result = fold (build3 (COND_EXPR, TREE_TYPE (gnu_expr), gnu_cond,
5087 build2 (COMPOUND_EXPR, TREE_TYPE (gnu_expr),
5088 gnu_call, gnu_expr),
5091 /* If GNU_EXPR has side effects, make the outer COMPOUND_EXPR and
5092 protect it. Otherwise, show GNU_RESULT has no side effects: we
5093 don't need to evaluate it just for the check. */
5094 if (TREE_SIDE_EFFECTS (gnu_expr))
5096 = build2 (COMPOUND_EXPR, TREE_TYPE (gnu_expr), gnu_expr, gnu_result);
5098 TREE_SIDE_EFFECTS (gnu_result) = 0;
5100 /* ??? Unfortunately, if we don't put a SAVE_EXPR around this whole thing,
5101 we will repeatedly do the test. It would be nice if GCC was able
5102 to optimize this and only do it once. */
5103 return save_expr (gnu_result);
5106 /* Return an expression that converts GNU_EXPR to GNAT_TYPE, doing
5107 overflow checks if OVERFLOW_P is nonzero and range checks if
5108 RANGE_P is nonzero. GNAT_TYPE is known to be an integral type.
5109 If TRUNCATE_P is nonzero, do a float to integer conversion with
5110 truncation; otherwise round. */
5113 convert_with_check (Entity_Id gnat_type, tree gnu_expr, bool overflowp,
5114 bool rangep, bool truncatep)
5116 tree gnu_type = get_unpadded_type (gnat_type);
5117 tree gnu_in_type = TREE_TYPE (gnu_expr);
5118 tree gnu_in_basetype = get_base_type (gnu_in_type);
5119 tree gnu_base_type = get_base_type (gnu_type);
5120 tree gnu_ada_base_type = get_ada_base_type (gnu_type);
5121 tree gnu_result = gnu_expr;
5123 /* If we are not doing any checks, the output is an integral type, and
5124 the input is not a floating type, just do the conversion. This
5125 shortcut is required to avoid problems with packed array types
5126 and simplifies code in all cases anyway. */
5127 if (!rangep && !overflowp && INTEGRAL_TYPE_P (gnu_base_type)
5128 && !FLOAT_TYPE_P (gnu_in_type))
5129 return convert (gnu_type, gnu_expr);
5131 /* First convert the expression to its base type. This
5132 will never generate code, but makes the tests below much simpler.
5133 But don't do this if converting from an integer type to an unconstrained
5134 array type since then we need to get the bounds from the original
5136 if (TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE)
5137 gnu_result = convert (gnu_in_basetype, gnu_result);
5139 /* If overflow checks are requested, we need to be sure the result will
5140 fit in the output base type. But don't do this if the input
5141 is integer and the output floating-point. */
5143 && !(FLOAT_TYPE_P (gnu_base_type) && INTEGRAL_TYPE_P (gnu_in_basetype)))
5145 /* Ensure GNU_EXPR only gets evaluated once. */
5146 tree gnu_input = protect_multiple_eval (gnu_result);
5147 tree gnu_cond = integer_zero_node;
5148 tree gnu_in_lb = TYPE_MIN_VALUE (gnu_in_basetype);
5149 tree gnu_in_ub = TYPE_MAX_VALUE (gnu_in_basetype);
5150 tree gnu_out_lb = TYPE_MIN_VALUE (gnu_base_type);
5151 tree gnu_out_ub = TYPE_MAX_VALUE (gnu_base_type);
5153 /* Convert the lower bounds to signed types, so we're sure we're
5154 comparing them properly. Likewise, convert the upper bounds
5155 to unsigned types. */
5156 if (INTEGRAL_TYPE_P (gnu_in_basetype) && TYPE_UNSIGNED (gnu_in_basetype))
5157 gnu_in_lb = convert (gnat_signed_type (gnu_in_basetype), gnu_in_lb);
5159 if (INTEGRAL_TYPE_P (gnu_in_basetype)
5160 && !TYPE_UNSIGNED (gnu_in_basetype))
5161 gnu_in_ub = convert (gnat_unsigned_type (gnu_in_basetype), gnu_in_ub);
5163 if (INTEGRAL_TYPE_P (gnu_base_type) && TYPE_UNSIGNED (gnu_base_type))
5164 gnu_out_lb = convert (gnat_signed_type (gnu_base_type), gnu_out_lb);
5166 if (INTEGRAL_TYPE_P (gnu_base_type) && !TYPE_UNSIGNED (gnu_base_type))
5167 gnu_out_ub = convert (gnat_unsigned_type (gnu_base_type), gnu_out_ub);
5169 /* Check each bound separately and only if the result bound
5170 is tighter than the bound on the input type. Note that all the
5171 types are base types, so the bounds must be constant. Also,
5172 the comparison is done in the base type of the input, which
5173 always has the proper signedness. First check for input
5174 integer (which means output integer), output float (which means
5175 both float), or mixed, in which case we always compare.
5176 Note that we have to do the comparison which would *fail* in the
5177 case of an error since if it's an FP comparison and one of the
5178 values is a NaN or Inf, the comparison will fail. */
5179 if (INTEGRAL_TYPE_P (gnu_in_basetype)
5180 ? tree_int_cst_lt (gnu_in_lb, gnu_out_lb)
5181 : (FLOAT_TYPE_P (gnu_base_type)
5182 ? REAL_VALUES_LESS (TREE_REAL_CST (gnu_in_lb),
5183 TREE_REAL_CST (gnu_out_lb))
5187 (build_binary_op (GE_EXPR, integer_type_node,
5188 gnu_input, convert (gnu_in_basetype,
5191 if (INTEGRAL_TYPE_P (gnu_in_basetype)
5192 ? tree_int_cst_lt (gnu_out_ub, gnu_in_ub)
5193 : (FLOAT_TYPE_P (gnu_base_type)
5194 ? REAL_VALUES_LESS (TREE_REAL_CST (gnu_out_ub),
5195 TREE_REAL_CST (gnu_in_lb))
5198 = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node, gnu_cond,
5200 (build_binary_op (LE_EXPR, integer_type_node,
5202 convert (gnu_in_basetype,
5205 if (!integer_zerop (gnu_cond))
5206 gnu_result = emit_check (gnu_cond, gnu_input,
5207 CE_Overflow_Check_Failed);
5210 /* Now convert to the result base type. If this is a non-truncating
5211 float-to-integer conversion, round. */
5212 if (INTEGRAL_TYPE_P (gnu_ada_base_type) && FLOAT_TYPE_P (gnu_in_basetype)
5215 REAL_VALUE_TYPE half_minus_pred_half, pred_half;
5216 tree gnu_conv, gnu_zero, gnu_comp, gnu_saved_result, calc_type;
5217 tree gnu_pred_half, gnu_add_pred_half, gnu_subtract_pred_half;
5218 const struct real_format *fmt;
5220 /* The following calculations depend on proper rounding to even
5221 of each arithmetic operation. In order to prevent excess
5222 precision from spoiling this property, use the widest hardware
5223 floating-point type.
5225 FIXME: For maximum efficiency, this should only be done for machines
5226 and types where intermediates may have extra precision. */
5228 calc_type = longest_float_type_node;
5229 /* FIXME: Should not have padding in the first place */
5230 if (TREE_CODE (calc_type) == RECORD_TYPE
5231 && TYPE_IS_PADDING_P (calc_type))
5232 calc_type = TREE_TYPE (TYPE_FIELDS (calc_type));
5234 /* Compute the exact value calc_type'Pred (0.5) at compile time. */
5235 fmt = REAL_MODE_FORMAT (TYPE_MODE (calc_type));
5236 real_2expN (&half_minus_pred_half, -(fmt->p) - 1);
5237 REAL_ARITHMETIC (pred_half, MINUS_EXPR, dconsthalf,
5238 half_minus_pred_half);
5239 gnu_pred_half = build_real (calc_type, pred_half);
5241 /* If the input is strictly negative, subtract this value
5242 and otherwise add it from the input. For 0.5, the result
5243 is exactly between 1.0 and the machine number preceding 1.0
5244 (for calc_type). Since the last bit of 1.0 is even, this 0.5
5245 will round to 1.0, while all other number with an absolute
5246 value less than 0.5 round to 0.0. For larger numbers exactly
5247 halfway between integers, rounding will always be correct as
5248 the true mathematical result will be closer to the higher
5249 integer compared to the lower one. So, this constant works
5250 for all floating-point numbers.
5252 The reason to use the same constant with subtract/add instead
5253 of a positive and negative constant is to allow the comparison
5254 to be scheduled in parallel with retrieval of the constant and
5255 conversion of the input to the calc_type (if necessary).
5258 gnu_zero = convert (gnu_in_basetype, integer_zero_node);
5259 gnu_saved_result = save_expr (gnu_result);
5260 gnu_conv = convert (calc_type, gnu_saved_result);
5261 gnu_comp = build2 (GE_EXPR, integer_type_node,
5262 gnu_saved_result, gnu_zero);
5264 = build2 (PLUS_EXPR, calc_type, gnu_conv, gnu_pred_half);
5265 gnu_subtract_pred_half
5266 = build2 (MINUS_EXPR, calc_type, gnu_conv, gnu_pred_half);
5267 gnu_result = build3 (COND_EXPR, calc_type, gnu_comp,
5268 gnu_add_pred_half, gnu_subtract_pred_half);
5271 if (TREE_CODE (gnu_ada_base_type) == INTEGER_TYPE
5272 && TYPE_HAS_ACTUAL_BOUNDS_P (gnu_ada_base_type)
5273 && TREE_CODE (gnu_result) == UNCONSTRAINED_ARRAY_REF)
5274 gnu_result = unchecked_convert (gnu_ada_base_type, gnu_result, false);
5276 gnu_result = convert (gnu_ada_base_type, gnu_result);
5278 /* Finally, do the range check if requested. Note that if the
5279 result type is a modular type, the range check is actually
5280 an overflow check. */
5283 || (TREE_CODE (gnu_base_type) == INTEGER_TYPE
5284 && TYPE_MODULAR_P (gnu_base_type) && overflowp))
5285 gnu_result = emit_range_check (gnu_result, gnat_type);
5287 return convert (gnu_type, gnu_result);
5290 /* Return 1 if GNU_EXPR can be directly addressed. This is the case unless
5291 it is an expression involving computation or if it involves a bitfield
5292 reference. This returns the same as gnat_mark_addressable in most
5296 addressable_p (tree gnu_expr)
5298 switch (TREE_CODE (gnu_expr))
5304 /* All DECLs are addressable: if they are in a register, we can force
5308 case UNCONSTRAINED_ARRAY_REF:
5316 return (!DECL_BIT_FIELD (TREE_OPERAND (gnu_expr, 1))
5317 && (!DECL_NONADDRESSABLE_P (TREE_OPERAND (gnu_expr, 1))
5318 || !flag_strict_aliasing)
5319 && addressable_p (TREE_OPERAND (gnu_expr, 0)));
5321 case ARRAY_REF: case ARRAY_RANGE_REF:
5322 case REALPART_EXPR: case IMAGPART_EXPR:
5324 return addressable_p (TREE_OPERAND (gnu_expr, 0));
5327 return (AGGREGATE_TYPE_P (TREE_TYPE (gnu_expr))
5328 && addressable_p (TREE_OPERAND (gnu_expr, 0)));
5330 case VIEW_CONVERT_EXPR:
5332 /* This is addressable if we can avoid a copy. */
5333 tree type = TREE_TYPE (gnu_expr);
5334 tree inner_type = TREE_TYPE (TREE_OPERAND (gnu_expr, 0));
5336 return (((TYPE_MODE (type) == TYPE_MODE (inner_type)
5337 && (TYPE_ALIGN (type) <= TYPE_ALIGN (inner_type)
5338 || TYPE_ALIGN (inner_type) >= BIGGEST_ALIGNMENT))
5339 || ((TYPE_MODE (type) == BLKmode
5340 || TYPE_MODE (inner_type) == BLKmode)
5341 && (TYPE_ALIGN (type) <= TYPE_ALIGN (inner_type)
5342 || TYPE_ALIGN (inner_type) >= BIGGEST_ALIGNMENT
5343 || TYPE_ALIGN_OK (type)
5344 || TYPE_ALIGN_OK (inner_type))))
5345 && addressable_p (TREE_OPERAND (gnu_expr, 0)));
5353 /* Do the processing for the declaration of a GNAT_ENTITY, a type. If
5354 a separate Freeze node exists, delay the bulk of the processing. Otherwise
5355 make a GCC type for GNAT_ENTITY and set up the correspondence. */
5358 process_type (Entity_Id gnat_entity)
5361 = present_gnu_tree (gnat_entity) ? get_gnu_tree (gnat_entity) : 0;
5364 /* If we are to delay elaboration of this type, just do any
5365 elaborations needed for expressions within the declaration and
5366 make a dummy type entry for this node and its Full_View (if
5367 any) in case something points to it. Don't do this if it
5368 has already been done (the only way that can happen is if
5369 the private completion is also delayed). */
5370 if (Present (Freeze_Node (gnat_entity))
5371 || (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
5372 && Present (Full_View (gnat_entity))
5373 && Freeze_Node (Full_View (gnat_entity))
5374 && !present_gnu_tree (Full_View (gnat_entity))))
5376 elaborate_entity (gnat_entity);
5380 tree gnu_decl = create_type_decl (get_entity_name (gnat_entity),
5381 make_dummy_type (gnat_entity),
5382 NULL, false, false, gnat_entity);
5384 save_gnu_tree (gnat_entity, gnu_decl, false);
5385 if (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
5386 && Present (Full_View (gnat_entity)))
5387 save_gnu_tree (Full_View (gnat_entity), gnu_decl, false);
5393 /* If we saved away a dummy type for this node it means that this
5394 made the type that corresponds to the full type of an incomplete
5395 type. Clear that type for now and then update the type in the
5399 if (TREE_CODE (gnu_old) != TYPE_DECL
5400 || !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_old)))
5402 /* If this was a withed access type, this is not an error
5403 and merely indicates we've already elaborated the type
5405 gcc_assert (Is_Type (gnat_entity) && From_With_Type (gnat_entity));
5409 save_gnu_tree (gnat_entity, NULL_TREE, false);
5412 /* Now fully elaborate the type. */
5413 gnu_new = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 1);
5414 gcc_assert (TREE_CODE (gnu_new) == TYPE_DECL);
5416 /* If we have an old type and we've made pointers to this type,
5417 update those pointers. */
5419 update_pointer_to (TYPE_MAIN_VARIANT (TREE_TYPE (gnu_old)),
5420 TREE_TYPE (gnu_new));
5422 /* If this is a record type corresponding to a task or protected type
5423 that is a completion of an incomplete type, perform a similar update
5425 /* ??? Including protected types here is a guess. */
5427 if (IN (Ekind (gnat_entity), Record_Kind)
5428 && Is_Concurrent_Record_Type (gnat_entity)
5429 && present_gnu_tree (Corresponding_Concurrent_Type (gnat_entity)))
5432 = get_gnu_tree (Corresponding_Concurrent_Type (gnat_entity));
5434 save_gnu_tree (Corresponding_Concurrent_Type (gnat_entity),
5436 save_gnu_tree (Corresponding_Concurrent_Type (gnat_entity),
5439 update_pointer_to (TYPE_MAIN_VARIANT (TREE_TYPE (gnu_task_old)),
5440 TREE_TYPE (gnu_new));
5444 /* GNAT_ASSOC is the front of the Component_Associations of an N_Aggregate.
5445 GNU_TYPE is the GCC type of the corresponding record.
5447 Return a CONSTRUCTOR to build the record. */
5450 assoc_to_constructor (Node_Id gnat_assoc, tree gnu_type)
5452 tree gnu_list, gnu_result;
5454 /* We test for GNU_FIELD being empty in the case where a variant
5455 was the last thing since we don't take things off GNAT_ASSOC in
5456 that case. We check GNAT_ASSOC in case we have a variant, but it
5459 for (gnu_list = NULL_TREE; Present (gnat_assoc);
5460 gnat_assoc = Next (gnat_assoc))
5462 Node_Id gnat_field = First (Choices (gnat_assoc));
5463 tree gnu_field = gnat_to_gnu_field_decl (Entity (gnat_field));
5464 tree gnu_expr = gnat_to_gnu (Expression (gnat_assoc));
5466 /* The expander is supposed to put a single component selector name
5467 in every record component association */
5468 gcc_assert (No (Next (gnat_field)));
5470 /* Ignore fields that have Corresponding_Discriminants since we'll
5471 be setting that field in the parent. */
5472 if (Present (Corresponding_Discriminant (Entity (gnat_field)))
5473 && Is_Tagged_Type (Scope (Entity (gnat_field))))
5476 /* Before assigning a value in an aggregate make sure range checks
5477 are done if required. Then convert to the type of the field. */
5478 if (Do_Range_Check (Expression (gnat_assoc)))
5479 gnu_expr = emit_range_check (gnu_expr, Etype (gnat_field));
5481 gnu_expr = convert (TREE_TYPE (gnu_field), gnu_expr);
5483 /* Add the field and expression to the list. */
5484 gnu_list = tree_cons (gnu_field, gnu_expr, gnu_list);
5487 gnu_result = extract_values (gnu_list, gnu_type);
5489 #ifdef ENABLE_CHECKING
5493 /* Verify every enty in GNU_LIST was used. */
5494 for (gnu_field = gnu_list; gnu_field; gnu_field = TREE_CHAIN (gnu_field))
5495 gcc_assert (TREE_ADDRESSABLE (gnu_field));
5502 /* Builds a possibly nested constructor for array aggregates. GNAT_EXPR
5503 is the first element of an array aggregate. It may itself be an
5504 aggregate (an array or record aggregate). GNU_ARRAY_TYPE is the gnu type
5505 corresponding to the array aggregate. GNAT_COMPONENT_TYPE is the type
5506 of the array component. It is needed for range checking. */
5509 pos_to_constructor (Node_Id gnat_expr, tree gnu_array_type,
5510 Entity_Id gnat_component_type)
5512 tree gnu_expr_list = NULL_TREE;
5513 tree gnu_index = TYPE_MIN_VALUE (TYPE_DOMAIN (gnu_array_type));
5516 for ( ; Present (gnat_expr); gnat_expr = Next (gnat_expr))
5518 /* If the expression is itself an array aggregate then first build the
5519 innermost constructor if it is part of our array (multi-dimensional
5522 if (Nkind (gnat_expr) == N_Aggregate
5523 && TREE_CODE (TREE_TYPE (gnu_array_type)) == ARRAY_TYPE
5524 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_array_type)))
5525 gnu_expr = pos_to_constructor (First (Expressions (gnat_expr)),
5526 TREE_TYPE (gnu_array_type),
5527 gnat_component_type);
5530 gnu_expr = gnat_to_gnu (gnat_expr);
5532 /* before assigning the element to the array make sure it is
5534 if (Do_Range_Check (gnat_expr))
5535 gnu_expr = emit_range_check (gnu_expr, gnat_component_type);
5539 = tree_cons (gnu_index, convert (TREE_TYPE (gnu_array_type), gnu_expr),
5542 gnu_index = int_const_binop (PLUS_EXPR, gnu_index, integer_one_node, 0);
5545 return gnat_build_constructor (gnu_array_type, nreverse (gnu_expr_list));
5548 /* Subroutine of assoc_to_constructor: VALUES is a list of field associations,
5549 some of which are from RECORD_TYPE. Return a CONSTRUCTOR consisting
5550 of the associations that are from RECORD_TYPE. If we see an internal
5551 record, make a recursive call to fill it in as well. */
5554 extract_values (tree values, tree record_type)
5556 tree result = NULL_TREE;
5559 for (field = TYPE_FIELDS (record_type); field; field = TREE_CHAIN (field))
5563 /* _Parent is an internal field, but may have values in the aggregate,
5564 so check for values first. */
5565 if ((tem = purpose_member (field, values)))
5567 value = TREE_VALUE (tem);
5568 TREE_ADDRESSABLE (tem) = 1;
5571 else if (DECL_INTERNAL_P (field))
5573 value = extract_values (values, TREE_TYPE (field));
5574 if (TREE_CODE (value) == CONSTRUCTOR && !CONSTRUCTOR_ELTS (value))
5578 /* If we have a record subtype, the names will match, but not the
5579 actual FIELD_DECLs. */
5580 for (tem = values; tem; tem = TREE_CHAIN (tem))
5581 if (DECL_NAME (TREE_PURPOSE (tem)) == DECL_NAME (field))
5583 value = convert (TREE_TYPE (field), TREE_VALUE (tem));
5584 TREE_ADDRESSABLE (tem) = 1;
5590 result = tree_cons (field, value, result);
5593 return gnat_build_constructor (record_type, nreverse (result));
5596 /* EXP is to be treated as an array or record. Handle the cases when it is
5597 an access object and perform the required dereferences. */
5600 maybe_implicit_deref (tree exp)
5602 /* If the type is a pointer, dereference it. */
5604 if (POINTER_TYPE_P (TREE_TYPE (exp)) || TYPE_FAT_POINTER_P (TREE_TYPE (exp)))
5605 exp = build_unary_op (INDIRECT_REF, NULL_TREE, exp);
5607 /* If we got a padded type, remove it too. */
5608 if (TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE
5609 && TYPE_IS_PADDING_P (TREE_TYPE (exp)))
5610 exp = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (exp))), exp);
5615 /* Protect EXP from multiple evaluation. This may make a SAVE_EXPR. */
5618 protect_multiple_eval (tree exp)
5620 tree type = TREE_TYPE (exp);
5622 /* If this has no side effects, we don't need to do anything. */
5623 if (!TREE_SIDE_EFFECTS (exp))
5626 /* If it is a conversion, protect what's inside the conversion.
5627 Similarly, if we're indirectly referencing something, we only
5628 actually need to protect the address since the data itself can't
5629 change in these situations. */
5630 else if (TREE_CODE (exp) == NON_LVALUE_EXPR
5631 || TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR
5632 || TREE_CODE (exp) == VIEW_CONVERT_EXPR
5633 || TREE_CODE (exp) == INDIRECT_REF
5634 || TREE_CODE (exp) == UNCONSTRAINED_ARRAY_REF)
5635 return build1 (TREE_CODE (exp), type,
5636 protect_multiple_eval (TREE_OPERAND (exp, 0)));
5638 /* If EXP is a fat pointer or something that can be placed into a register,
5639 just make a SAVE_EXPR. */
5640 if (TYPE_FAT_POINTER_P (type) || TYPE_MODE (type) != BLKmode)
5641 return save_expr (exp);
5643 /* Otherwise, dereference, protect the address, and re-reference. */
5646 build_unary_op (INDIRECT_REF, type,
5647 save_expr (build_unary_op (ADDR_EXPR,
5648 build_reference_type (type),
5652 /* This is equivalent to stabilize_reference in GCC's tree.c, but we know
5653 how to handle our new nodes and we take an extra argument that says
5654 whether to force evaluation of everything. */
5657 gnat_stabilize_reference (tree ref, bool force)
5659 tree type = TREE_TYPE (ref);
5660 enum tree_code code = TREE_CODE (ref);
5668 /* No action is needed in this case. */
5674 case FIX_TRUNC_EXPR:
5675 case FIX_FLOOR_EXPR:
5676 case FIX_ROUND_EXPR:
5678 case VIEW_CONVERT_EXPR:
5681 = build1 (code, type,
5682 gnat_stabilize_reference (TREE_OPERAND (ref, 0), force));
5686 case UNCONSTRAINED_ARRAY_REF:
5687 result = build1 (code, type,
5688 gnat_stabilize_reference_1 (TREE_OPERAND (ref, 0),
5693 result = build3 (COMPONENT_REF, type,
5694 gnat_stabilize_reference (TREE_OPERAND (ref, 0),
5696 TREE_OPERAND (ref, 1), NULL_TREE);
5700 result = build3 (BIT_FIELD_REF, type,
5701 gnat_stabilize_reference (TREE_OPERAND (ref, 0), force),
5702 gnat_stabilize_reference_1 (TREE_OPERAND (ref, 1),
5704 gnat_stabilize_reference_1 (TREE_OPERAND (ref, 2),
5709 case ARRAY_RANGE_REF:
5710 result = build4 (code, type,
5711 gnat_stabilize_reference (TREE_OPERAND (ref, 0), force),
5712 gnat_stabilize_reference_1 (TREE_OPERAND (ref, 1),
5714 NULL_TREE, NULL_TREE);
5718 result = build2 (COMPOUND_EXPR, type,
5719 gnat_stabilize_reference_1 (TREE_OPERAND (ref, 0),
5721 gnat_stabilize_reference (TREE_OPERAND (ref, 1),
5725 /* If arg isn't a kind of lvalue we recognize, make no change.
5726 Caller should recognize the error for an invalid lvalue. */
5731 return error_mark_node;
5734 TREE_READONLY (result) = TREE_READONLY (ref);
5736 /* TREE_THIS_VOLATILE and TREE_SIDE_EFFECTS attached to the initial
5737 expression may not be sustained across some paths, such as the way via
5738 build1 for INDIRECT_REF. We re-populate those flags here for the general
5739 case, which is consistent with the GCC version of this routine.
5741 Special care should be taken regarding TREE_SIDE_EFFECTS, because some
5742 paths introduce side effects where there was none initially (e.g. calls
5743 to save_expr), and we also want to keep track of that. */
5745 TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (ref);
5746 TREE_SIDE_EFFECTS (result) |= TREE_SIDE_EFFECTS (ref);
5751 /* Similar to stabilize_reference_1 in tree.c, but supports an extra
5752 arg to force a SAVE_EXPR for everything. */
5755 gnat_stabilize_reference_1 (tree e, bool force)
5757 enum tree_code code = TREE_CODE (e);
5758 tree type = TREE_TYPE (e);
5761 /* We cannot ignore const expressions because it might be a reference
5762 to a const array but whose index contains side-effects. But we can
5763 ignore things that are actual constant or that already have been
5764 handled by this function. */
5766 if (TREE_CONSTANT (e) || code == SAVE_EXPR)
5769 switch (TREE_CODE_CLASS (code))
5771 case tcc_exceptional:
5773 case tcc_declaration:
5774 case tcc_comparison:
5776 case tcc_expression:
5778 /* If this is a COMPONENT_REF of a fat pointer, save the entire
5779 fat pointer. This may be more efficient, but will also allow
5780 us to more easily find the match for the PLACEHOLDER_EXPR. */
5781 if (code == COMPONENT_REF
5782 && TYPE_FAT_POINTER_P (TREE_TYPE (TREE_OPERAND (e, 0))))
5783 result = build3 (COMPONENT_REF, type,
5784 gnat_stabilize_reference_1 (TREE_OPERAND (e, 0),
5786 TREE_OPERAND (e, 1), TREE_OPERAND (e, 2));
5787 else if (TREE_SIDE_EFFECTS (e) || force)
5788 return save_expr (e);
5794 /* Constants need no processing. In fact, we should never reach
5799 /* Recursively stabilize each operand. */
5800 result = build2 (code, type,
5801 gnat_stabilize_reference_1 (TREE_OPERAND (e, 0), force),
5802 gnat_stabilize_reference_1 (TREE_OPERAND (e, 1),
5807 /* Recursively stabilize each operand. */
5808 result = build1 (code, type,
5809 gnat_stabilize_reference_1 (TREE_OPERAND (e, 0),
5817 TREE_READONLY (result) = TREE_READONLY (e);
5819 TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (e);
5820 TREE_SIDE_EFFECTS (result) |= TREE_SIDE_EFFECTS (e);
5824 extern char *__gnat_to_canonical_file_spec (char *);
5826 /* Convert Sloc into *LOCUS (a location_t). Return true if this Sloc
5827 corresponds to a source code location and false if it doesn't. In the
5828 latter case, we don't update *LOCUS. We also set the Gigi global variable
5829 REF_FILENAME to the reference file name as given by sinput (i.e no
5833 Sloc_to_locus (Source_Ptr Sloc, location_t *locus)
5835 /* If node not from source code, ignore. */
5839 /* Use the identifier table to make a hashed, permanent copy of the filename,
5840 since the name table gets reallocated after Gigi returns but before all
5841 the debugging information is output. The __gnat_to_canonical_file_spec
5842 call translates filenames from pragmas Source_Reference that contain host
5843 style syntax not understood by gdb. */
5845 = IDENTIFIER_POINTER
5847 (__gnat_to_canonical_file_spec
5848 (Get_Name_String (Full_Debug_Name (Get_Source_File_Index (Sloc))))));
5850 locus->line = Get_Logical_Line_Number (Sloc);
5853 = IDENTIFIER_POINTER
5855 (Get_Name_String (Debug_Source_Name (Get_Source_File_Index (Sloc)))));;
5860 /* Similar to annotate_with_locus, but start with the Sloc of GNAT_NODE and
5861 don't do anything if it doesn't correspond to a source location. */
5864 annotate_with_node (tree node, Node_Id gnat_node)
5868 if (!Sloc_to_locus (Sloc (gnat_node), &locus))
5871 annotate_with_locus (node, locus);
5874 /* Post an error message. MSG is the error message, properly annotated.
5875 NODE is the node at which to post the error and the node to use for the
5876 "&" substitution. */
5879 post_error (const char *msg, Node_Id node)
5881 String_Template temp;
5884 temp.Low_Bound = 1, temp.High_Bound = strlen (msg);
5885 fp.Array = msg, fp.Bounds = &temp;
5887 Error_Msg_N (fp, node);
5890 /* Similar, but NODE is the node at which to post the error and ENT
5891 is the node to use for the "&" substitution. */
5894 post_error_ne (const char *msg, Node_Id node, Entity_Id ent)
5896 String_Template temp;
5899 temp.Low_Bound = 1, temp.High_Bound = strlen (msg);
5900 fp.Array = msg, fp.Bounds = &temp;
5902 Error_Msg_NE (fp, node, ent);
5905 /* Similar, but NODE is the node at which to post the error, ENT is the node
5906 to use for the "&" substitution, and N is the number to use for the ^. */
5909 post_error_ne_num (const char *msg, Node_Id node, Entity_Id ent, int n)
5911 String_Template temp;
5914 temp.Low_Bound = 1, temp.High_Bound = strlen (msg);
5915 fp.Array = msg, fp.Bounds = &temp;
5916 Error_Msg_Uint_1 = UI_From_Int (n);
5919 Error_Msg_NE (fp, node, ent);
5922 /* Similar to post_error_ne_num, but T is a GCC tree representing the
5923 number to write. If the tree represents a constant that fits within
5924 a host integer, the text inside curly brackets in MSG will be output
5925 (presumably including a '^'). Otherwise that text will not be output
5926 and the text inside square brackets will be output instead. */
5929 post_error_ne_tree (const char *msg, Node_Id node, Entity_Id ent, tree t)
5931 char *newmsg = alloca (strlen (msg) + 1);
5932 String_Template temp = {1, 0};
5934 char start_yes, end_yes, start_no, end_no;
5938 fp.Array = newmsg, fp.Bounds = &temp;
5940 if (host_integerp (t, 1)
5941 #if HOST_BITS_PER_WIDE_INT > HOST_BITS_PER_INT
5944 (t, (((unsigned HOST_WIDE_INT) 1 << (HOST_BITS_PER_INT - 1)) - 1)) < 0
5948 Error_Msg_Uint_1 = UI_From_Int (tree_low_cst (t, 1));
5949 start_yes = '{', end_yes = '}', start_no = '[', end_no = ']';
5952 start_yes = '[', end_yes = ']', start_no = '{', end_no = '}';
5954 for (p = msg, q = newmsg; *p; p++)
5956 if (*p == start_yes)
5957 for (p++; *p != end_yes; p++)
5959 else if (*p == start_no)
5960 for (p++; *p != end_no; p++)
5968 temp.High_Bound = strlen (newmsg);
5970 Error_Msg_NE (fp, node, ent);
5973 /* Similar to post_error_ne_tree, except that NUM is a second
5974 integer to write in the message. */
5977 post_error_ne_tree_2 (const char *msg,
5983 Error_Msg_Uint_2 = UI_From_Int (num);
5984 post_error_ne_tree (msg, node, ent, t);
5987 /* Initialize the table that maps GNAT codes to GCC codes for simple
5988 binary and unary operations. */
5991 init_code_table (void)
5993 gnu_codes[N_And_Then] = TRUTH_ANDIF_EXPR;
5994 gnu_codes[N_Or_Else] = TRUTH_ORIF_EXPR;
5996 gnu_codes[N_Op_And] = TRUTH_AND_EXPR;
5997 gnu_codes[N_Op_Or] = TRUTH_OR_EXPR;
5998 gnu_codes[N_Op_Xor] = TRUTH_XOR_EXPR;
5999 gnu_codes[N_Op_Eq] = EQ_EXPR;
6000 gnu_codes[N_Op_Ne] = NE_EXPR;
6001 gnu_codes[N_Op_Lt] = LT_EXPR;
6002 gnu_codes[N_Op_Le] = LE_EXPR;
6003 gnu_codes[N_Op_Gt] = GT_EXPR;
6004 gnu_codes[N_Op_Ge] = GE_EXPR;
6005 gnu_codes[N_Op_Add] = PLUS_EXPR;
6006 gnu_codes[N_Op_Subtract] = MINUS_EXPR;
6007 gnu_codes[N_Op_Multiply] = MULT_EXPR;
6008 gnu_codes[N_Op_Mod] = FLOOR_MOD_EXPR;
6009 gnu_codes[N_Op_Rem] = TRUNC_MOD_EXPR;
6010 gnu_codes[N_Op_Minus] = NEGATE_EXPR;
6011 gnu_codes[N_Op_Abs] = ABS_EXPR;
6012 gnu_codes[N_Op_Not] = TRUTH_NOT_EXPR;
6013 gnu_codes[N_Op_Rotate_Left] = LROTATE_EXPR;
6014 gnu_codes[N_Op_Rotate_Right] = RROTATE_EXPR;
6015 gnu_codes[N_Op_Shift_Left] = LSHIFT_EXPR;
6016 gnu_codes[N_Op_Shift_Right] = RSHIFT_EXPR;
6017 gnu_codes[N_Op_Shift_Right_Arithmetic] = RSHIFT_EXPR;
6020 #include "gt-ada-trans.h"