1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 1992-2004, 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
);
168 /* Constants for +0.5 and -0.5 for float-to-integer rounding. */
169 static REAL_VALUE_TYPE dconstp5
;
170 static REAL_VALUE_TYPE dconstmp5
;
172 /* This is the main program of the back-end. It sets up all the table
173 structures and then generates code. */
176 gigi (Node_Id gnat_root
, int max_gnat_node
, int number_name
,
177 struct Node
*nodes_ptr
, Node_Id
*next_node_ptr
, Node_Id
*prev_node_ptr
,
178 struct Elist_Header
*elists_ptr
, struct Elmt_Item
*elmts_ptr
,
179 struct String_Entry
*strings_ptr
, Char_Code
*string_chars_ptr
,
180 struct List_Header
*list_headers_ptr
, Int number_units ATTRIBUTE_UNUSED
,
181 char *file_info_ptr ATTRIBUTE_UNUSED
, Entity_Id standard_integer
,
182 Entity_Id standard_long_long_float
, Entity_Id standard_exception_type
,
183 Int gigi_operating_mode
)
185 tree gnu_standard_long_long_float
;
186 tree gnu_standard_exception_type
;
187 struct elab_info
*info
;
189 max_gnat_nodes
= max_gnat_node
;
190 number_names
= number_name
;
191 Nodes_Ptr
= nodes_ptr
;
192 Next_Node_Ptr
= next_node_ptr
;
193 Prev_Node_Ptr
= prev_node_ptr
;
194 Elists_Ptr
= elists_ptr
;
195 Elmts_Ptr
= elmts_ptr
;
196 Strings_Ptr
= strings_ptr
;
197 String_Chars_Ptr
= string_chars_ptr
;
198 List_Headers_Ptr
= list_headers_ptr
;
200 type_annotate_only
= (gigi_operating_mode
== 1);
203 gnat_compute_largest_alignment ();
206 /* If we are just annotating types, give VOID_TYPE zero sizes to avoid
208 if (type_annotate_only
)
210 TYPE_SIZE (void_type_node
) = bitsize_zero_node
;
211 TYPE_SIZE_UNIT (void_type_node
) = size_zero_node
;
214 /* Save the type we made for integer as the type for Standard.Integer.
215 Then make the rest of the standard types. Note that some of these
217 save_gnu_tree (Base_Type (standard_integer
), TYPE_NAME (integer_type_node
),
220 gnu_except_ptr_stack
= tree_cons (NULL_TREE
, NULL_TREE
, NULL_TREE
);
222 gnu_standard_long_long_float
223 = gnat_to_gnu_entity (Base_Type (standard_long_long_float
), NULL_TREE
, 0);
224 gnu_standard_exception_type
225 = gnat_to_gnu_entity (Base_Type (standard_exception_type
), NULL_TREE
, 0);
227 init_gigi_decls (gnu_standard_long_long_float
, gnu_standard_exception_type
);
229 /* Process any Pragma Ident for the main unit. */
230 #ifdef ASM_OUTPUT_IDENT
231 if (Present (Ident_String (Main_Unit
)))
234 TREE_STRING_POINTER (gnat_to_gnu (Ident_String (Main_Unit
))));
237 /* If we are using the GCC exception mechanism, let GCC know. */
238 if (Exception_Mechanism
== GCC_ZCX
)
241 gcc_assert (Nkind (gnat_root
) == N_Compilation_Unit
);
242 Compilation_Unit_to_gnu (gnat_root
);
244 /* Now see if we have any elaboration procedures to deal with. */
245 for (info
= elab_info_list
; info
; info
= info
->next
)
247 tree gnu_body
= DECL_SAVED_TREE (info
->elab_proc
);
250 /* Mark everything we have as not visited. */
251 walk_tree_without_duplicates (&gnu_body
, mark_unvisited
, NULL
);
253 /* Set the current function to be the elaboration procedure and gimplify
255 current_function_decl
= info
->elab_proc
;
256 gimplify_body (&gnu_body
, info
->elab_proc
);
258 /* We should have a BIND_EXPR, but it may or may not have any statements
259 in it. If it doesn't have any, we have nothing to do. */
260 gnu_stmts
= gnu_body
;
261 if (TREE_CODE (gnu_stmts
) == BIND_EXPR
)
262 gnu_stmts
= BIND_EXPR_BODY (gnu_stmts
);
264 /* If there are no statements, there is no elaboration code. */
265 if (!gnu_stmts
|| !STATEMENT_LIST_HEAD (gnu_stmts
))
266 Set_Has_No_Elaboration_Code (info
->gnat_node
, 1);
269 /* Otherwise, compile the function. Note that we'll be gimplifying
270 it twice, but that's fine for the nodes we use. */
271 begin_subprog_body (info
->elab_proc
);
272 end_subprog_body (gnu_body
);
277 /* Perform initializations for this module. */
280 gnat_init_stmt_group ()
282 /* Initialize ourselves. */
286 /* Enable GNAT stack checking method if needed */
287 if (!Stack_Check_Probes_On_Target
)
288 set_stack_check_libfunc (gen_rtx_SYMBOL_REF (Pmode
, "_gnat_stack_check"));
290 gcc_assert (Exception_Mechanism
!= Front_End_ZCX
);
292 REAL_ARITHMETIC (dconstp5
, RDIV_EXPR
, dconst1
, dconst2
);
293 REAL_ARITHMETIC (dconstmp5
, RDIV_EXPR
, dconstm1
, dconst2
);
296 /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Identifier,
297 to a GCC tree, which is returned. GNU_RESULT_TYPE_P is a pointer to
298 where we should place the result type. */
301 Identifier_to_gnu (Node_Id gnat_node
, tree
*gnu_result_type_p
)
303 tree gnu_result_type
;
305 Node_Id gnat_temp
, gnat_temp_type
;
307 /* If the Etype of this node does not equal the Etype of the Entity,
308 something is wrong with the entity map, probably in generic
309 instantiation. However, this does not apply to types. Since we sometime
310 have strange Ekind's, just do this test for objects. Also, if the Etype of
311 the Entity is private, the Etype of the N_Identifier is allowed to be the
312 full type and also we consider a packed array type to be the same as the
313 original type. Similarly, a class-wide type is equivalent to a subtype of
314 itself. Finally, if the types are Itypes, one may be a copy of the other,
315 which is also legal. */
316 gnat_temp
= (Nkind (gnat_node
) == N_Defining_Identifier
317 ? gnat_node
: Entity (gnat_node
));
318 gnat_temp_type
= Etype (gnat_temp
);
320 gcc_assert (Etype (gnat_node
) == gnat_temp_type
321 || (Is_Packed (gnat_temp_type
)
322 && Etype (gnat_node
) == Packed_Array_Type (gnat_temp_type
))
323 || (Is_Class_Wide_Type (Etype (gnat_node
)))
324 || (IN (Ekind (gnat_temp_type
), Private_Kind
)
325 && Present (Full_View (gnat_temp_type
))
326 && ((Etype (gnat_node
) == Full_View (gnat_temp_type
))
327 || (Is_Packed (Full_View (gnat_temp_type
))
328 && (Etype (gnat_node
)
329 == Packed_Array_Type (Full_View
330 (gnat_temp_type
))))))
331 || (Is_Itype (Etype (gnat_node
)) && Is_Itype (gnat_temp_type
))
332 || !(Ekind (gnat_temp
) == E_Variable
333 || Ekind (gnat_temp
) == E_Component
334 || Ekind (gnat_temp
) == E_Constant
335 || Ekind (gnat_temp
) == E_Loop_Parameter
336 || IN (Ekind (gnat_temp
), Formal_Kind
)));
338 /* If this is a reference to a deferred constant whose partial view is an
339 unconstrained private type, the proper type is on the full view of the
340 constant, not on the full view of the type, which may be unconstrained.
342 This may be a reference to a type, for example in the prefix of the
343 attribute Position, generated for dispatching code (see Make_DT in
344 exp_disp,adb). In that case we need the type itself, not is parent,
345 in particular if it is a derived type */
346 if (Is_Private_Type (gnat_temp_type
)
347 && Has_Unknown_Discriminants (gnat_temp_type
)
348 && Present (Full_View (gnat_temp
))
349 && !Is_Type (gnat_temp
))
351 gnat_temp
= Full_View (gnat_temp
);
352 gnat_temp_type
= Etype (gnat_temp
);
353 gnu_result_type
= get_unpadded_type (gnat_temp_type
);
357 /* Expand the type of this identitier first, in case it is an enumeral
358 literal, which only get made when the type is expanded. There is no
359 order-of-elaboration issue here. We want to use the Actual_Subtype if
360 it has already been elaborated, otherwise the Etype. Avoid using
361 Actual_Subtype for packed arrays to simplify things. */
362 if ((Ekind (gnat_temp
) == E_Constant
363 || Ekind (gnat_temp
) == E_Variable
|| Is_Formal (gnat_temp
))
364 && !(Is_Array_Type (Etype (gnat_temp
))
365 && Present (Packed_Array_Type (Etype (gnat_temp
))))
366 && Present (Actual_Subtype (gnat_temp
))
367 && present_gnu_tree (Actual_Subtype (gnat_temp
)))
368 gnat_temp_type
= Actual_Subtype (gnat_temp
);
370 gnat_temp_type
= Etype (gnat_node
);
372 gnu_result_type
= get_unpadded_type (gnat_temp_type
);
375 gnu_result
= gnat_to_gnu_entity (gnat_temp
, NULL_TREE
, 0);
377 /* If we are in an exception handler, force this variable into memory to
378 ensure optimization does not remove stores that appear redundant but are
379 actually needed in case an exception occurs.
381 ??? Note that we need not do this if the variable is declared within the
382 handler, only if it is referenced in the handler and declared in an
383 enclosing block, but we have no way of testing that right now.
385 ??? Also, for now all we can do is make it volatile. But we only
387 if (TREE_VALUE (gnu_except_ptr_stack
)
388 && TREE_CODE (gnu_result
) == VAR_DECL
)
389 TREE_THIS_VOLATILE (gnu_result
) = TREE_SIDE_EFFECTS (gnu_result
) = 1;
391 /* Some objects (such as parameters passed by reference, globals of
392 variable size, and renamed objects) actually represent the address
393 of the object. In that case, we must do the dereference. Likewise,
394 deal with parameters to foreign convention subprograms. Call fold
395 here since GNU_RESULT may be a CONST_DECL. */
396 if (DECL_P (gnu_result
)
397 && (DECL_BY_REF_P (gnu_result
)
398 || (TREE_CODE (gnu_result
) == PARM_DECL
399 && DECL_BY_COMPONENT_PTR_P (gnu_result
))))
401 bool ro
= DECL_POINTS_TO_READONLY_P (gnu_result
);
404 if (TREE_CODE (gnu_result
) == PARM_DECL
405 && DECL_BY_COMPONENT_PTR_P (gnu_result
))
407 = build_unary_op (INDIRECT_REF
, NULL_TREE
,
408 convert (build_pointer_type (gnu_result_type
),
411 /* If the object is constant, we try to do the dereference directly
412 through the DECL_INITIAL. This is actually required in order to get
413 correct aliasing information for renamed objects that are components
414 of non-aliased aggregates, because the type of the renamed object and
415 that of the aggregate don't alias.
417 Note that we expect the initial value to have been stabilized.
418 If it contains e.g. a variable reference, we certainly don't want
419 to re-evaluate the variable each time the renaming is used.
421 Stabilization is currently not performed at the global level but
422 create_var_decl avoids setting DECL_INITIAL if the value is not
423 constant then, and we get to the pointer dereference below.
425 ??? Couldn't the aliasing issue show up again in this case ?
426 There is no obvious reason why not. */
427 else if (TREE_READONLY (gnu_result
)
428 && DECL_INITIAL (gnu_result
)
429 /* Strip possible conversion to reference type. */
430 && ((initial
= TREE_CODE (DECL_INITIAL (gnu_result
))
432 ? TREE_OPERAND (DECL_INITIAL (gnu_result
), 0)
433 : DECL_INITIAL (gnu_result
), 1))
434 && TREE_CODE (initial
) == ADDR_EXPR
435 && (TREE_CODE (TREE_OPERAND (initial
, 0)) == ARRAY_REF
436 || (TREE_CODE (TREE_OPERAND (initial
, 0))
438 gnu_result
= TREE_OPERAND (initial
, 0);
440 gnu_result
= build_unary_op (INDIRECT_REF
, NULL_TREE
,
443 TREE_READONLY (gnu_result
) = TREE_STATIC (gnu_result
) = ro
;
446 /* The GNAT tree has the type of a function as the type of its result. Also
447 use the type of the result if the Etype is a subtype which is nominally
448 unconstrained. But remove any padding from the resulting type. */
449 if (TREE_CODE (TREE_TYPE (gnu_result
)) == FUNCTION_TYPE
450 || Is_Constr_Subt_For_UN_Aliased (gnat_temp_type
))
452 gnu_result_type
= TREE_TYPE (gnu_result
);
453 if (TREE_CODE (gnu_result_type
) == RECORD_TYPE
454 && TYPE_IS_PADDING_P (gnu_result_type
))
455 gnu_result_type
= TREE_TYPE (TYPE_FIELDS (gnu_result_type
));
458 /* We always want to return the underlying INTEGER_CST for an enumeration
459 literal to avoid the need to call fold in lots of places. But don't do
460 this is the parent will be taking the address of this object. */
461 if (TREE_CODE (gnu_result
) == CONST_DECL
)
463 gnat_temp
= Parent (gnat_node
);
464 if (!DECL_CONST_CORRESPONDING_VAR (gnu_result
)
465 || (Nkind (gnat_temp
) != N_Reference
466 && !(Nkind (gnat_temp
) == N_Attribute_Reference
467 && ((Get_Attribute_Id (Attribute_Name (gnat_temp
))
469 || (Get_Attribute_Id (Attribute_Name (gnat_temp
))
471 || (Get_Attribute_Id (Attribute_Name (gnat_temp
))
472 == Attr_Unchecked_Access
)
473 || (Get_Attribute_Id (Attribute_Name (gnat_temp
))
474 == Attr_Unrestricted_Access
)))))
475 gnu_result
= DECL_INITIAL (gnu_result
);
478 *gnu_result_type_p
= gnu_result_type
;
482 /* Subroutine of gnat_to_gnu to process gnat_node, an N_Pragma. Return
483 any statements we generate. */
486 Pragma_to_gnu (Node_Id gnat_node
)
489 tree gnu_result
= alloc_stmt_list ();
491 /* Check for (and ignore) unrecognized pragma and do nothing if we are just
493 if (type_annotate_only
|| !Is_Pragma_Name (Chars (gnat_node
)))
496 switch (Get_Pragma_Id (Chars (gnat_node
)))
498 case Pragma_Inspection_Point
:
499 /* Do nothing at top level: all such variables are already viewable. */
500 if (global_bindings_p ())
503 for (gnat_temp
= First (Pragma_Argument_Associations (gnat_node
));
505 gnat_temp
= Next (gnat_temp
))
507 tree gnu_expr
= gnat_to_gnu (Expression (gnat_temp
));
509 if (TREE_CODE (gnu_expr
) == UNCONSTRAINED_ARRAY_REF
)
510 gnu_expr
= TREE_OPERAND (gnu_expr
, 0);
512 gnu_expr
= build1 (USE_STMT
, void_type_node
, gnu_expr
);
513 annotate_with_node (gnu_expr
, gnat_node
);
514 append_to_statement_list (gnu_expr
, &gnu_result
);
518 case Pragma_Optimize
:
519 switch (Chars (Expression
520 (First (Pragma_Argument_Associations (gnat_node
)))))
522 case Name_Time
: case Name_Space
:
524 post_error ("insufficient -O value?", gnat_node
);
529 post_error ("must specify -O0?", gnat_node
);
537 case Pragma_Reviewable
:
538 if (write_symbols
== NO_DEBUG
)
539 post_error ("must specify -g?", gnat_node
);
545 /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Attribute,
546 to a GCC tree, which is returned. GNU_RESULT_TYPE_P is a pointer to
547 where we should place the result type. ATTRIBUTE is the attribute ID. */
550 Attribute_to_gnu (Node_Id gnat_node
, tree
*gnu_result_type_p
, int attribute
)
552 tree gnu_result
= error_mark_node
;
553 tree gnu_result_type
;
555 bool prefix_unused
= false;
556 tree gnu_prefix
= gnat_to_gnu (Prefix (gnat_node
));
557 tree gnu_type
= TREE_TYPE (gnu_prefix
);
559 /* If the input is a NULL_EXPR, make a new one. */
560 if (TREE_CODE (gnu_prefix
) == NULL_EXPR
)
562 *gnu_result_type_p
= get_unpadded_type (Etype (gnat_node
));
563 return build1 (NULL_EXPR
, *gnu_result_type_p
,
564 TREE_OPERAND (gnu_prefix
, 0));
571 /* These are just conversions until since representation clauses for
572 enumerations are handled in the front end. */
574 bool checkp
= Do_Range_Check (First (Expressions (gnat_node
)));
576 gnu_result
= gnat_to_gnu (First (Expressions (gnat_node
)));
577 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
578 gnu_result
= convert_with_check (Etype (gnat_node
), gnu_result
,
579 checkp
, checkp
, true);
585 /* These just add or subject the constant 1. Representation clauses for
586 enumerations are handled in the front-end. */
587 gnu_expr
= gnat_to_gnu (First (Expressions (gnat_node
)));
588 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
590 if (Do_Range_Check (First (Expressions (gnat_node
))))
592 gnu_expr
= protect_multiple_eval (gnu_expr
);
595 (build_binary_op (EQ_EXPR
, integer_type_node
,
597 attribute
== Attr_Pred
598 ? TYPE_MIN_VALUE (gnu_result_type
)
599 : TYPE_MAX_VALUE (gnu_result_type
)),
600 gnu_expr
, CE_Range_Check_Failed
);
604 = build_binary_op (attribute
== Attr_Pred
605 ? MINUS_EXPR
: PLUS_EXPR
,
606 gnu_result_type
, gnu_expr
,
607 convert (gnu_result_type
, integer_one_node
));
611 case Attr_Unrestricted_Access
:
612 /* Conversions don't change something's address but can cause us to miss
613 the COMPONENT_REF case below, so strip them off. */
614 gnu_prefix
= remove_conversions (gnu_prefix
,
615 !Must_Be_Byte_Aligned (gnat_node
));
617 /* If we are taking 'Address of an unconstrained object, this is the
618 pointer to the underlying array. */
619 gnu_prefix
= maybe_unconstrained_array (gnu_prefix
);
621 /* ... fall through ... */
624 case Attr_Unchecked_Access
:
625 case Attr_Code_Address
:
626 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
628 = build_unary_op (((attribute
== Attr_Address
629 || attribute
== Attr_Unrestricted_Access
)
630 && !Must_Be_Byte_Aligned (gnat_node
))
631 ? ATTR_ADDR_EXPR
: ADDR_EXPR
,
632 gnu_result_type
, gnu_prefix
);
634 /* For 'Code_Address, find an inner ADDR_EXPR and mark it so that we
635 don't try to build a trampoline. */
636 if (attribute
== Attr_Code_Address
)
638 for (gnu_expr
= gnu_result
;
639 TREE_CODE (gnu_expr
) == NOP_EXPR
640 || TREE_CODE (gnu_expr
) == CONVERT_EXPR
;
641 gnu_expr
= TREE_OPERAND (gnu_expr
, 0))
642 TREE_CONSTANT (gnu_expr
) = 1;
644 if (TREE_CODE (gnu_expr
) == ADDR_EXPR
)
645 TREE_STATIC (gnu_expr
) = TREE_CONSTANT (gnu_expr
) = 1;
649 case Attr_Pool_Address
:
652 tree gnu_ptr
= gnu_prefix
;
654 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
656 /* If this is an unconstrained array, we know the object must have been
657 allocated with the template in front of the object. So compute the
659 if (TYPE_FAT_POINTER_P (TREE_TYPE (gnu_ptr
)))
661 = convert (build_pointer_type
662 (TYPE_OBJECT_RECORD_TYPE
663 (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (gnu_ptr
)))),
666 gnu_obj_type
= TREE_TYPE (TREE_TYPE (gnu_ptr
));
667 if (TREE_CODE (gnu_obj_type
) == RECORD_TYPE
668 && TYPE_CONTAINS_TEMPLATE_P (gnu_obj_type
))
670 tree gnu_char_ptr_type
= build_pointer_type (char_type_node
);
671 tree gnu_pos
= byte_position (TYPE_FIELDS (gnu_obj_type
));
673 = convert (gnu_char_ptr_type
,
674 size_diffop (size_zero_node
, gnu_pos
));
676 gnu_ptr
= convert (gnu_char_ptr_type
, gnu_ptr
);
677 gnu_ptr
= build_binary_op (MINUS_EXPR
, gnu_char_ptr_type
,
678 gnu_ptr
, gnu_byte_offset
);
681 gnu_result
= convert (gnu_result_type
, gnu_ptr
);
686 case Attr_Object_Size
:
687 case Attr_Value_Size
:
688 case Attr_Max_Size_In_Storage_Elements
:
689 gnu_expr
= gnu_prefix
;
691 /* Remove NOPS from gnu_expr and conversions from gnu_prefix.
692 We only use GNU_EXPR to see if a COMPONENT_REF was involved. */
693 while (TREE_CODE (gnu_expr
) == NOP_EXPR
)
694 gnu_expr
= TREE_OPERAND (gnu_expr
, 0)
697 gnu_prefix
= remove_conversions (gnu_prefix
, true);
698 prefix_unused
= true;
699 gnu_type
= TREE_TYPE (gnu_prefix
);
701 /* Replace an unconstrained array type with the type of the underlying
702 array. We can't do this with a call to maybe_unconstrained_array
703 since we may have a TYPE_DECL. For 'Max_Size_In_Storage_Elements,
704 use the record type that will be used to allocate the object and its
706 if (TREE_CODE (gnu_type
) == UNCONSTRAINED_ARRAY_TYPE
)
708 gnu_type
= TYPE_OBJECT_RECORD_TYPE (gnu_type
);
709 if (attribute
!= Attr_Max_Size_In_Storage_Elements
)
710 gnu_type
= TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type
)));
713 /* If we're looking for the size of a field, return the field size.
714 Otherwise, if the prefix is an object, or if 'Object_Size or
715 'Max_Size_In_Storage_Elements has been specified, the result is the
716 GCC size of the type. Otherwise, the result is the RM_Size of the
718 if (TREE_CODE (gnu_prefix
) == COMPONENT_REF
)
719 gnu_result
= DECL_SIZE (TREE_OPERAND (gnu_prefix
, 1));
720 else if (TREE_CODE (gnu_prefix
) != TYPE_DECL
721 || attribute
== Attr_Object_Size
722 || attribute
== Attr_Max_Size_In_Storage_Elements
)
724 /* If this is a padded type, the GCC size isn't relevant to the
725 programmer. Normally, what we want is the RM_Size, which was set
726 from the specified size, but if it was not set, we want the size
727 of the relevant field. Using the MAX of those two produces the
728 right result in all case. Don't use the size of the field if it's
729 a self-referential type, since that's never what's wanted. */
730 if (TREE_CODE (gnu_type
) == RECORD_TYPE
731 && TYPE_IS_PADDING_P (gnu_type
)
732 && TREE_CODE (gnu_expr
) == COMPONENT_REF
)
734 gnu_result
= rm_size (gnu_type
);
735 if (!(CONTAINS_PLACEHOLDER_P
736 (DECL_SIZE (TREE_OPERAND (gnu_expr
, 1)))))
738 = size_binop (MAX_EXPR
, gnu_result
,
739 DECL_SIZE (TREE_OPERAND (gnu_expr
, 1)));
742 gnu_result
= TYPE_SIZE (gnu_type
);
745 gnu_result
= rm_size (gnu_type
);
747 gcc_assert (gnu_result
);
749 /* Deal with a self-referential size by returning the maximum size for a
750 type and by qualifying the size with the object for 'Size of an
752 if (CONTAINS_PLACEHOLDER_P (gnu_result
))
754 if (TREE_CODE (gnu_prefix
) != TYPE_DECL
)
755 gnu_result
= substitute_placeholder_in_expr (gnu_result
,
758 gnu_result
= max_size (gnu_result
, true);
761 /* If the type contains a template, subtract its size. */
762 if (TREE_CODE (gnu_type
) == RECORD_TYPE
763 && TYPE_CONTAINS_TEMPLATE_P (gnu_type
))
764 gnu_result
= size_binop (MINUS_EXPR
, gnu_result
,
765 DECL_SIZE (TYPE_FIELDS (gnu_type
)));
767 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
769 /* Always perform division using unsigned arithmetic as the size cannot
770 be negative, but may be an overflowed positive value. This provides
771 correct results for sizes up to 512 MB.
773 ??? Size should be calculated in storage elements directly. */
775 if (attribute
== Attr_Max_Size_In_Storage_Elements
)
776 gnu_result
= convert (sizetype
,
777 fold (build2 (CEIL_DIV_EXPR
, bitsizetype
,
778 gnu_result
, bitsize_unit_node
)));
782 if (TREE_CODE (gnu_prefix
) == COMPONENT_REF
783 && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_prefix
, 0)))
785 && (TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_prefix
, 0)))))
786 gnu_prefix
= TREE_OPERAND (gnu_prefix
, 0);
788 gnu_type
= TREE_TYPE (gnu_prefix
);
789 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
790 prefix_unused
= true;
792 if (TREE_CODE (gnu_prefix
) == COMPONENT_REF
)
793 gnu_result
= size_int (DECL_ALIGN (TREE_OPERAND (gnu_prefix
, 1)));
795 gnu_result
= size_int (TYPE_ALIGN (gnu_type
) / BITS_PER_UNIT
);
800 case Attr_Range_Length
:
801 prefix_unused
= true;
803 if (INTEGRAL_TYPE_P (gnu_type
) || TREE_CODE (gnu_type
) == REAL_TYPE
)
805 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
807 if (attribute
== Attr_First
)
808 gnu_result
= TYPE_MIN_VALUE (gnu_type
);
809 else if (attribute
== Attr_Last
)
810 gnu_result
= TYPE_MAX_VALUE (gnu_type
);
814 (MAX_EXPR
, get_base_type (gnu_result_type
),
816 (PLUS_EXPR
, get_base_type (gnu_result_type
),
817 build_binary_op (MINUS_EXPR
,
818 get_base_type (gnu_result_type
),
819 convert (gnu_result_type
,
820 TYPE_MAX_VALUE (gnu_type
)),
821 convert (gnu_result_type
,
822 TYPE_MIN_VALUE (gnu_type
))),
823 convert (gnu_result_type
, integer_one_node
)),
824 convert (gnu_result_type
, integer_zero_node
));
829 /* ... fall through ... */
833 int Dimension
= (Present (Expressions (gnat_node
))
834 ? UI_To_Int (Intval (First (Expressions (gnat_node
))))
837 /* Make sure any implicit dereference gets done. */
838 gnu_prefix
= maybe_implicit_deref (gnu_prefix
);
839 gnu_prefix
= maybe_unconstrained_array (gnu_prefix
);
840 gnu_type
= TREE_TYPE (gnu_prefix
);
841 prefix_unused
= true;
842 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
844 if (TYPE_CONVENTION_FORTRAN_P (gnu_type
))
849 for (ndim
= 1, gnu_type_temp
= gnu_type
;
850 TREE_CODE (TREE_TYPE (gnu_type_temp
)) == ARRAY_TYPE
851 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type_temp
));
852 ndim
++, gnu_type_temp
= TREE_TYPE (gnu_type_temp
))
855 Dimension
= ndim
+ 1 - Dimension
;
858 for (; Dimension
> 1; Dimension
--)
859 gnu_type
= TREE_TYPE (gnu_type
);
861 gcc_assert (TREE_CODE (gnu_type
) == ARRAY_TYPE
);
862 if (attribute
== Attr_First
)
864 = TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type
)));
865 else if (attribute
== Attr_Last
)
867 = TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type
)));
869 /* 'Length or 'Range_Length. */
871 tree gnu_compute_type
872 = gnat_signed_or_unsigned_type (0,
873 get_base_type (gnu_result_type
));
877 (MAX_EXPR
, gnu_compute_type
,
879 (PLUS_EXPR
, gnu_compute_type
,
881 (MINUS_EXPR
, gnu_compute_type
,
882 convert (gnu_compute_type
,
884 (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type
)))),
885 convert (gnu_compute_type
,
887 (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type
))))),
888 convert (gnu_compute_type
, integer_one_node
)),
889 convert (gnu_compute_type
, integer_zero_node
));
892 /* If this has a PLACEHOLDER_EXPR, qualify it by the object we are
893 handling. Note that these attributes could not have been used on
894 an unconstrained array type. */
895 gnu_result
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_result
,
900 case Attr_Bit_Position
:
906 HOST_WIDE_INT bitsize
;
907 HOST_WIDE_INT bitpos
;
909 tree gnu_field_bitpos
;
910 tree gnu_field_offset
;
912 enum machine_mode mode
;
913 int unsignedp
, volatilep
;
915 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
916 gnu_prefix
= remove_conversions (gnu_prefix
, true);
917 prefix_unused
= true;
919 /* We can have 'Bit on any object, but if it isn't a COMPONENT_REF,
920 the result is 0. Don't allow 'Bit on a bare component, though. */
921 if (attribute
== Attr_Bit
922 && TREE_CODE (gnu_prefix
) != COMPONENT_REF
923 && TREE_CODE (gnu_prefix
) != FIELD_DECL
)
925 gnu_result
= integer_zero_node
;
930 gcc_assert (TREE_CODE (gnu_prefix
) == COMPONENT_REF
931 || (attribute
== Attr_Bit_Position
932 && TREE_CODE (gnu_prefix
) == FIELD_DECL
));
934 get_inner_reference (gnu_prefix
, &bitsize
, &bitpos
, &gnu_offset
,
935 &mode
, &unsignedp
, &volatilep
);
937 if (TREE_CODE (gnu_prefix
) == COMPONENT_REF
)
939 gnu_field_bitpos
= bit_position (TREE_OPERAND (gnu_prefix
, 1));
940 gnu_field_offset
= byte_position (TREE_OPERAND (gnu_prefix
, 1));
942 for (gnu_inner
= TREE_OPERAND (gnu_prefix
, 0);
943 TREE_CODE (gnu_inner
) == COMPONENT_REF
944 && DECL_INTERNAL_P (TREE_OPERAND (gnu_inner
, 1));
945 gnu_inner
= TREE_OPERAND (gnu_inner
, 0))
948 = size_binop (PLUS_EXPR
, gnu_field_bitpos
,
949 bit_position (TREE_OPERAND (gnu_inner
, 1)));
951 = size_binop (PLUS_EXPR
, gnu_field_offset
,
952 byte_position (TREE_OPERAND (gnu_inner
, 1)));
955 else if (TREE_CODE (gnu_prefix
) == FIELD_DECL
)
957 gnu_field_bitpos
= bit_position (gnu_prefix
);
958 gnu_field_offset
= byte_position (gnu_prefix
);
962 gnu_field_bitpos
= bitsize_zero_node
;
963 gnu_field_offset
= size_zero_node
;
969 gnu_result
= gnu_field_offset
;
974 gnu_result
= size_int (bitpos
% BITS_PER_UNIT
);
978 gnu_result
= bitsize_int (bitpos
% BITS_PER_UNIT
);
979 gnu_result
= size_binop (PLUS_EXPR
, gnu_result
,
980 TYPE_SIZE (TREE_TYPE (gnu_prefix
)));
981 gnu_result
= size_binop (MINUS_EXPR
, gnu_result
,
985 case Attr_Bit_Position
:
986 gnu_result
= gnu_field_bitpos
;
990 /* If this has a PLACEHOLDER_EXPR, qualify it by the object
992 gnu_result
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_result
, gnu_prefix
);
999 tree gnu_lhs
= gnat_to_gnu (First (Expressions (gnat_node
)));
1000 tree gnu_rhs
= gnat_to_gnu (Next (First (Expressions (gnat_node
))));
1002 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
1003 gnu_result
= build_binary_op (attribute
== Attr_Min
1004 ? MIN_EXPR
: MAX_EXPR
,
1005 gnu_result_type
, gnu_lhs
, gnu_rhs
);
1009 case Attr_Passed_By_Reference
:
1010 gnu_result
= size_int (default_pass_by_ref (gnu_type
)
1011 || must_pass_by_ref (gnu_type
));
1012 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
1015 case Attr_Component_Size
:
1016 if (TREE_CODE (gnu_prefix
) == COMPONENT_REF
1017 && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_prefix
, 0)))
1019 && (TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_prefix
, 0)))))
1020 gnu_prefix
= TREE_OPERAND (gnu_prefix
, 0);
1022 gnu_prefix
= maybe_implicit_deref (gnu_prefix
);
1023 gnu_type
= TREE_TYPE (gnu_prefix
);
1025 if (TREE_CODE (gnu_type
) == UNCONSTRAINED_ARRAY_TYPE
)
1026 gnu_type
= TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_type
))));
1028 while (TREE_CODE (TREE_TYPE (gnu_type
)) == ARRAY_TYPE
1029 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type
)))
1030 gnu_type
= TREE_TYPE (gnu_type
);
1032 gcc_assert (TREE_CODE (gnu_type
) == ARRAY_TYPE
);
1034 /* Note this size cannot be self-referential. */
1035 gnu_result
= TYPE_SIZE (TREE_TYPE (gnu_type
));
1036 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
1037 prefix_unused
= true;
1040 case Attr_Null_Parameter
:
1041 /* This is just a zero cast to the pointer type for
1042 our prefix and dereferenced. */
1043 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
1045 = build_unary_op (INDIRECT_REF
, NULL_TREE
,
1046 convert (build_pointer_type (gnu_result_type
),
1047 integer_zero_node
));
1048 TREE_PRIVATE (gnu_result
) = 1;
1051 case Attr_Mechanism_Code
:
1054 Entity_Id gnat_obj
= Entity (Prefix (gnat_node
));
1056 prefix_unused
= true;
1057 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
1058 if (Present (Expressions (gnat_node
)))
1060 int i
= UI_To_Int (Intval (First (Expressions (gnat_node
))));
1062 for (gnat_obj
= First_Formal (gnat_obj
); i
> 1;
1063 i
--, gnat_obj
= Next_Formal (gnat_obj
))
1067 code
= Mechanism (gnat_obj
);
1068 if (code
== Default
)
1069 code
= ((present_gnu_tree (gnat_obj
)
1070 && (DECL_BY_REF_P (get_gnu_tree (gnat_obj
))
1071 || ((TREE_CODE (get_gnu_tree (gnat_obj
))
1073 && (DECL_BY_COMPONENT_PTR_P
1074 (get_gnu_tree (gnat_obj
))))))
1075 ? By_Reference
: By_Copy
);
1076 gnu_result
= convert (gnu_result_type
, size_int (- code
));
1081 /* Say we have an unimplemented attribute. Then set the value to be
1082 returned to be a zero and hope that's something we can convert to the
1083 type of this attribute. */
1084 post_error ("unimplemented attribute", gnat_node
);
1085 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
1086 gnu_result
= integer_zero_node
;
1090 /* If this is an attribute where the prefix was unused, force a use of it if
1091 it has a side-effect. But don't do it if the prefix is just an entity
1092 name. However, if an access check is needed, we must do it. See second
1093 example in AARM 11.6(5.e). */
1094 if (prefix_unused
&& TREE_SIDE_EFFECTS (gnu_prefix
)
1095 && !Is_Entity_Name (Prefix (gnat_node
)))
1096 gnu_result
= fold (build2 (COMPOUND_EXPR
, TREE_TYPE (gnu_result
),
1097 gnu_prefix
, gnu_result
));
1099 *gnu_result_type_p
= gnu_result_type
;
1103 /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Case_Statement,
1104 to a GCC tree, which is returned. */
1107 Case_Statement_to_gnu (Node_Id gnat_node
)
1113 gnu_expr
= gnat_to_gnu (Expression (gnat_node
));
1114 gnu_expr
= convert (get_base_type (TREE_TYPE (gnu_expr
)), gnu_expr
);
1116 /* The range of values in a case statement is determined by the rules in
1117 RM 5.4(7-9). In almost all cases, this range is represented by the Etype
1118 of the expression. One exception arises in the case of a simple name that
1119 is parenthesized. This still has the Etype of the name, but since it is
1120 not a name, para 7 does not apply, and we need to go to the base type.
1121 This is the only case where parenthesization affects the dynamic
1122 semantics (i.e. the range of possible values at runtime that is covered
1123 by the others alternative.
1125 Another exception is if the subtype of the expression is non-static. In
1126 that case, we also have to use the base type. */
1127 if (Paren_Count (Expression (gnat_node
)) != 0
1128 || !Is_OK_Static_Subtype (Underlying_Type
1129 (Etype (Expression (gnat_node
)))))
1130 gnu_expr
= convert (get_base_type (TREE_TYPE (gnu_expr
)), gnu_expr
);
1132 /* We build a SWITCH_EXPR that contains the code with interspersed
1133 CASE_LABEL_EXPRs for each label. */
1135 push_stack (&gnu_switch_label_stack
, NULL_TREE
, create_artificial_label ());
1136 start_stmt_group ();
1137 for (gnat_when
= First_Non_Pragma (Alternatives (gnat_node
));
1138 Present (gnat_when
);
1139 gnat_when
= Next_Non_Pragma (gnat_when
))
1141 Node_Id gnat_choice
;
1143 /* First compile all the different case choices for the current WHEN
1145 for (gnat_choice
= First (Discrete_Choices (gnat_when
));
1146 Present (gnat_choice
); gnat_choice
= Next (gnat_choice
))
1148 tree gnu_low
= NULL_TREE
, gnu_high
= NULL_TREE
;
1150 switch (Nkind (gnat_choice
))
1153 gnu_low
= gnat_to_gnu (Low_Bound (gnat_choice
));
1154 gnu_high
= gnat_to_gnu (High_Bound (gnat_choice
));
1157 case N_Subtype_Indication
:
1158 gnu_low
= gnat_to_gnu (Low_Bound (Range_Expression
1159 (Constraint (gnat_choice
))));
1160 gnu_high
= gnat_to_gnu (High_Bound (Range_Expression
1161 (Constraint (gnat_choice
))));
1165 case N_Expanded_Name
:
1166 /* This represents either a subtype range or a static value of
1167 some kind; Ekind says which. If a static value, fall through
1168 to the next case. */
1169 if (IN (Ekind (Entity (gnat_choice
)), Type_Kind
))
1171 tree gnu_type
= get_unpadded_type (Entity (gnat_choice
));
1173 gnu_low
= fold (TYPE_MIN_VALUE (gnu_type
));
1174 gnu_high
= fold (TYPE_MAX_VALUE (gnu_type
));
1178 /* ... fall through ... */
1180 case N_Character_Literal
:
1181 case N_Integer_Literal
:
1182 gnu_low
= gnat_to_gnu (gnat_choice
);
1185 case N_Others_Choice
:
1192 add_stmt_with_node (build3 (CASE_LABEL_EXPR
, void_type_node
,
1194 create_artificial_label ()),
1198 /* Push a binding level here in case variables are declared since we want
1199 them to be local to this set of statements instead of the block
1200 containing the Case statement. */
1201 add_stmt (build_stmt_group (Statements (gnat_when
), true));
1202 add_stmt (build1 (GOTO_EXPR
, void_type_node
,
1203 TREE_VALUE (gnu_switch_label_stack
)));
1206 /* Now emit a definition of the label all the cases branched to. */
1207 add_stmt (build1 (LABEL_EXPR
, void_type_node
,
1208 TREE_VALUE (gnu_switch_label_stack
)));
1209 gnu_result
= build3 (SWITCH_EXPR
, TREE_TYPE (gnu_expr
), gnu_expr
,
1210 end_stmt_group (), NULL_TREE
);
1211 pop_stack (&gnu_switch_label_stack
);
1216 /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Loop_Statement,
1217 to a GCC tree, which is returned. */
1220 Loop_Statement_to_gnu (Node_Id gnat_node
)
1222 /* ??? It would be nice to use "build" here, but there's no build5. */
1223 tree gnu_loop_stmt
= build_nt (LOOP_STMT
, NULL_TREE
, NULL_TREE
,
1224 NULL_TREE
, NULL_TREE
, NULL_TREE
);
1225 tree gnu_loop_var
= NULL_TREE
;
1226 Node_Id gnat_iter_scheme
= Iteration_Scheme (gnat_node
);
1227 tree gnu_cond_expr
= NULL_TREE
;
1230 TREE_TYPE (gnu_loop_stmt
) = void_type_node
;
1231 TREE_SIDE_EFFECTS (gnu_loop_stmt
) = 1;
1232 LOOP_STMT_LABEL (gnu_loop_stmt
) = create_artificial_label ();
1233 annotate_with_node (gnu_loop_stmt
, gnat_node
);
1235 /* Save the end label of this LOOP_STMT in a stack so that the corresponding
1236 N_Exit_Statement can find it. */
1237 push_stack (&gnu_loop_label_stack
, NULL_TREE
,
1238 LOOP_STMT_LABEL (gnu_loop_stmt
));
1240 /* Set the condition that under which the loop should continue.
1241 For "LOOP .... END LOOP;" the condition is always true. */
1242 if (No (gnat_iter_scheme
))
1244 /* The case "WHILE condition LOOP ..... END LOOP;" */
1245 else if (Present (Condition (gnat_iter_scheme
)))
1246 LOOP_STMT_TOP_COND (gnu_loop_stmt
)
1247 = gnat_to_gnu (Condition (gnat_iter_scheme
));
1250 /* We have an iteration scheme. */
1251 Node_Id gnat_loop_spec
= Loop_Parameter_Specification (gnat_iter_scheme
);
1252 Entity_Id gnat_loop_var
= Defining_Entity (gnat_loop_spec
);
1253 Entity_Id gnat_type
= Etype (gnat_loop_var
);
1254 tree gnu_type
= get_unpadded_type (gnat_type
);
1255 tree gnu_low
= TYPE_MIN_VALUE (gnu_type
);
1256 tree gnu_high
= TYPE_MAX_VALUE (gnu_type
);
1257 bool reversep
= Reverse_Present (gnat_loop_spec
);
1258 tree gnu_first
= reversep
? gnu_high
: gnu_low
;
1259 tree gnu_last
= reversep
? gnu_low
: gnu_high
;
1260 enum tree_code end_code
= reversep
? GE_EXPR
: LE_EXPR
;
1261 tree gnu_base_type
= get_base_type (gnu_type
);
1262 tree gnu_limit
= (reversep
? TYPE_MIN_VALUE (gnu_base_type
)
1263 : TYPE_MAX_VALUE (gnu_base_type
));
1265 /* We know the loop variable will not overflow if GNU_LAST is a constant
1266 and is not equal to GNU_LIMIT. If it might overflow, we have to move
1267 the limit test to the end of the loop. In that case, we have to test
1268 for an empty loop outside the loop. */
1269 if (TREE_CODE (gnu_last
) != INTEGER_CST
1270 || TREE_CODE (gnu_limit
) != INTEGER_CST
1271 || tree_int_cst_equal (gnu_last
, gnu_limit
))
1274 = build3 (COND_EXPR
, void_type_node
,
1275 build_binary_op (LE_EXPR
, integer_type_node
,
1277 NULL_TREE
, alloc_stmt_list ());
1278 annotate_with_node (gnu_cond_expr
, gnat_loop_spec
);
1281 /* Open a new nesting level that will surround the loop to declare the
1282 loop index variable. */
1283 start_stmt_group ();
1286 /* Declare the loop index and set it to its initial value. */
1287 gnu_loop_var
= gnat_to_gnu_entity (gnat_loop_var
, gnu_first
, 1);
1288 if (DECL_BY_REF_P (gnu_loop_var
))
1289 gnu_loop_var
= build_unary_op (INDIRECT_REF
, NULL_TREE
, gnu_loop_var
);
1291 /* The loop variable might be a padded type, so use `convert' to get a
1292 reference to the inner variable if so. */
1293 gnu_loop_var
= convert (get_base_type (gnu_type
), gnu_loop_var
);
1295 /* Set either the top or bottom exit condition as appropriate depending
1296 on whether or not we know an overflow cannot occur. */
1298 LOOP_STMT_BOT_COND (gnu_loop_stmt
)
1299 = build_binary_op (NE_EXPR
, integer_type_node
,
1300 gnu_loop_var
, gnu_last
);
1302 LOOP_STMT_TOP_COND (gnu_loop_stmt
)
1303 = build_binary_op (end_code
, integer_type_node
,
1304 gnu_loop_var
, gnu_last
);
1306 LOOP_STMT_UPDATE (gnu_loop_stmt
)
1307 = build_binary_op (reversep
? PREDECREMENT_EXPR
1308 : PREINCREMENT_EXPR
,
1309 TREE_TYPE (gnu_loop_var
),
1311 convert (TREE_TYPE (gnu_loop_var
),
1313 annotate_with_node (LOOP_STMT_UPDATE (gnu_loop_stmt
),
1317 /* If the loop was named, have the name point to this loop. In this case,
1318 the association is not a ..._DECL node, but the end label from this
1320 if (Present (Identifier (gnat_node
)))
1321 save_gnu_tree (Entity (Identifier (gnat_node
)),
1322 LOOP_STMT_LABEL (gnu_loop_stmt
), true);
1324 /* Make the loop body into its own block, so any allocated storage will be
1325 released every iteration. This is needed for stack allocation. */
1326 LOOP_STMT_BODY (gnu_loop_stmt
)
1327 = build_stmt_group (Statements (gnat_node
), true);
1329 /* If we declared a variable, then we are in a statement group for that
1330 declaration. Add the LOOP_STMT to it and make that the "loop". */
1333 add_stmt (gnu_loop_stmt
);
1335 gnu_loop_stmt
= end_stmt_group ();
1338 /* If we have an outer COND_EXPR, that's our result and this loop is its
1339 "true" statement. Otherwise, the result is the LOOP_STMT. */
1342 COND_EXPR_THEN (gnu_cond_expr
) = gnu_loop_stmt
;
1343 gnu_result
= gnu_cond_expr
;
1344 recalculate_side_effects (gnu_cond_expr
);
1347 gnu_result
= gnu_loop_stmt
;
1349 pop_stack (&gnu_loop_label_stack
);
1354 /* Subroutine of gnat_to_gnu to process gnat_node, an N_Subprogram_Body. We
1355 don't return anything. */
1358 Subprogram_Body_to_gnu (Node_Id gnat_node
)
1360 /* Save debug output mode in case it is reset. */
1361 enum debug_info_type save_write_symbols
= write_symbols
;
1362 const struct gcc_debug_hooks
*const save_debug_hooks
= debug_hooks
;
1363 /* Definining identifier of a parameter to the subprogram. */
1364 Entity_Id gnat_param
;
1365 /* The defining identifier for the subprogram body. Note that if a
1366 specification has appeared before for this body, then the identifier
1367 occurring in that specification will also be a defining identifier and all
1368 the calls to this subprogram will point to that specification. */
1369 Entity_Id gnat_subprog_id
1370 = (Present (Corresponding_Spec (gnat_node
))
1371 ? Corresponding_Spec (gnat_node
) : Defining_Entity (gnat_node
));
1372 /* The FUNCTION_DECL node corresponding to the subprogram spec. */
1373 tree gnu_subprog_decl
;
1374 /* The FUNCTION_TYPE node corresponding to the subprogram spec. */
1375 tree gnu_subprog_type
;
1379 /* If this is a generic object or if it has been eliminated,
1381 if (Ekind (gnat_subprog_id
) == E_Generic_Procedure
1382 || Ekind (gnat_subprog_id
) == E_Generic_Function
1383 || Is_Eliminated (gnat_subprog_id
))
1386 /* If debug information is suppressed for the subprogram, turn debug
1387 mode off for the duration of processing. */
1388 if (!Needs_Debug_Info (gnat_subprog_id
))
1390 write_symbols
= NO_DEBUG
;
1391 debug_hooks
= &do_nothing_debug_hooks
;
1394 /* If this subprogram acts as its own spec, define it. Otherwise, just get
1395 the already-elaborated tree node. However, if this subprogram had its
1396 elaboration deferred, we will already have made a tree node for it. So
1397 treat it as not being defined in that case. Such a subprogram cannot
1398 have an address clause or a freeze node, so this test is safe, though it
1399 does disable some otherwise-useful error checking. */
1401 = gnat_to_gnu_entity (gnat_subprog_id
, NULL_TREE
,
1402 Acts_As_Spec (gnat_node
)
1403 && !present_gnu_tree (gnat_subprog_id
));
1405 gnu_subprog_type
= TREE_TYPE (gnu_subprog_decl
);
1407 /* Set the line number in the decl to correspond to that of the body so that
1408 the line number notes are written
1410 Sloc_to_locus (Sloc (gnat_node
), &DECL_SOURCE_LOCATION (gnu_subprog_decl
));
1412 begin_subprog_body (gnu_subprog_decl
);
1413 gnu_cico_list
= TYPE_CI_CO_LIST (gnu_subprog_type
);
1415 /* If there are OUT parameters, we need to ensure that the return statement
1416 properly copies them out. We do this by making a new block and converting
1417 any inner return into a goto to a label at the end of the block. */
1418 push_stack (&gnu_return_label_stack
, NULL_TREE
,
1419 gnu_cico_list
? create_artificial_label () : NULL_TREE
);
1421 /* Get a tree corresponding to the code for the subprogram. */
1422 start_stmt_group ();
1425 /* See if there are any parameters for which we don't yet have GCC entities.
1426 These must be for OUT parameters for which we will be making VAR_DECL
1427 nodes here. Fill them in to TYPE_CI_CO_LIST, which must contain the empty
1428 entry as well. We can match up the entries because TYPE_CI_CO_LIST is in
1429 the order of the parameters. */
1430 for (gnat_param
= First_Formal (gnat_subprog_id
);
1431 Present (gnat_param
);
1432 gnat_param
= Next_Formal_With_Extras (gnat_param
))
1433 if (!present_gnu_tree (gnat_param
))
1435 /* Skip any entries that have been already filled in; they must
1436 correspond to IN OUT parameters. */
1437 for (; gnu_cico_list
&& TREE_VALUE (gnu_cico_list
);
1438 gnu_cico_list
= TREE_CHAIN (gnu_cico_list
))
1441 /* Do any needed references for padded types. */
1442 TREE_VALUE (gnu_cico_list
)
1443 = convert (TREE_TYPE (TREE_PURPOSE (gnu_cico_list
)),
1444 gnat_to_gnu_entity (gnat_param
, NULL_TREE
, 1));
1447 process_decls (Declarations (gnat_node
), Empty
, Empty
, true, true);
1449 /* Generate the code of the subprogram itself. A return statement will be
1450 present and any OUT parameters will be handled there. */
1451 add_stmt (gnat_to_gnu (Handled_Statement_Sequence (gnat_node
)));
1453 gnu_result
= end_stmt_group ();
1455 /* If we made a special return label, we need to make a block that contains
1456 the definition of that label and the copying to the return value. That
1457 block first contains the function, then the label and copy statement. */
1458 if (TREE_VALUE (gnu_return_label_stack
))
1462 start_stmt_group ();
1464 add_stmt (gnu_result
);
1465 add_stmt (build1 (LABEL_EXPR
, void_type_node
,
1466 TREE_VALUE (gnu_return_label_stack
)));
1468 gnu_cico_list
= TYPE_CI_CO_LIST (gnu_subprog_type
);
1469 if (list_length (gnu_cico_list
) == 1)
1470 gnu_retval
= TREE_VALUE (gnu_cico_list
);
1472 gnu_retval
= gnat_build_constructor (TREE_TYPE (gnu_subprog_type
),
1475 if (DECL_P (gnu_retval
) && DECL_BY_REF_P (gnu_retval
))
1476 gnu_retval
= build_unary_op (INDIRECT_REF
, NULL_TREE
, gnu_retval
);
1479 (build1 (RETURN_EXPR
, void_type_node
,
1480 build2 (MODIFY_EXPR
, TREE_TYPE (gnu_retval
),
1481 DECL_RESULT (current_function_decl
), gnu_retval
)),
1484 gnu_result
= end_stmt_group ();
1487 pop_stack (&gnu_return_label_stack
);
1489 /* Initialize the information node for the function and set the
1491 allocate_struct_function (current_function_decl
);
1493 ((Present (End_Label (Handled_Statement_Sequence (gnat_node
)))
1494 ? Sloc (End_Label (Handled_Statement_Sequence (gnat_node
)))
1495 : Sloc (gnat_node
)),
1496 &cfun
->function_end_locus
);
1498 end_subprog_body (gnu_result
);
1500 /* Disconnect the trees for parameters that we made variables for from the
1501 GNAT entities since these are unusable after we end the function. */
1502 for (gnat_param
= First_Formal (gnat_subprog_id
);
1503 Present (gnat_param
);
1504 gnat_param
= Next_Formal_With_Extras (gnat_param
))
1505 if (TREE_CODE (get_gnu_tree (gnat_param
)) == VAR_DECL
)
1506 save_gnu_tree (gnat_param
, NULL_TREE
, false);
1508 mark_out_of_scope (Defining_Unit_Name (Specification (gnat_node
)));
1509 write_symbols
= save_write_symbols
;
1510 debug_hooks
= save_debug_hooks
;
1513 /* Subroutine of gnat_to_gnu to translate gnat_node, either an N_Function_Call
1514 or an N_Procedure_Call_Statement, to a GCC tree, which is returned.
1515 GNU_RESULT_TYPE_P is a pointer to where we should place the result type.
1516 If GNU_TARGET is non-null, this must be a function call and the result
1517 of the call is to be placed into that object. */
1520 call_to_gnu (Node_Id gnat_node
, tree
*gnu_result_type_p
, tree gnu_target
)
1523 /* The GCC node corresponding to the GNAT subprogram name. This can either
1524 be a FUNCTION_DECL node if we are dealing with a standard subprogram call,
1525 or an indirect reference expression (an INDIRECT_REF node) pointing to a
1527 tree gnu_subprog_node
= gnat_to_gnu (Name (gnat_node
));
1528 /* The FUNCTION_TYPE node giving the GCC type of the subprogram. */
1529 tree gnu_subprog_type
= TREE_TYPE (gnu_subprog_node
);
1530 tree gnu_subprog_addr
= build_unary_op (ADDR_EXPR
, NULL_TREE
,
1532 Entity_Id gnat_formal
;
1533 Node_Id gnat_actual
;
1534 tree gnu_actual_list
= NULL_TREE
;
1535 tree gnu_name_list
= NULL_TREE
;
1536 tree gnu_before_list
= NULL_TREE
;
1537 tree gnu_after_list
= NULL_TREE
;
1538 tree gnu_subprog_call
;
1540 switch (Nkind (Name (gnat_node
)))
1543 case N_Operator_Symbol
:
1544 case N_Expanded_Name
:
1545 case N_Attribute_Reference
:
1546 if (Is_Eliminated (Entity (Name (gnat_node
))))
1547 Eliminate_Error_Msg (gnat_node
, Entity (Name (gnat_node
)));
1550 gcc_assert (TREE_CODE (gnu_subprog_type
) == FUNCTION_TYPE
);
1552 /* If we are calling a stubbed function, make this into a raise of
1553 Program_Error. Elaborate all our args first. */
1554 if (TREE_CODE (gnu_subprog_node
) == FUNCTION_DECL
1555 && DECL_STUBBED_P (gnu_subprog_node
))
1557 for (gnat_actual
= First_Actual (gnat_node
);
1558 Present (gnat_actual
);
1559 gnat_actual
= Next_Actual (gnat_actual
))
1560 add_stmt (gnat_to_gnu (gnat_actual
));
1562 if (Nkind (gnat_node
) == N_Function_Call
&& !gnu_target
)
1564 *gnu_result_type_p
= TREE_TYPE (gnu_subprog_type
);
1565 return build1 (NULL_EXPR
, *gnu_result_type_p
,
1566 build_call_raise (PE_Stubbed_Subprogram_Called
));
1569 return build_call_raise (PE_Stubbed_Subprogram_Called
);
1572 /* If we are calling by supplying a pointer to a target, set up that
1573 pointer as the first argument. Use GNU_TARGET if one was passed;
1574 otherwise, make a target by building a variable of the maximum size
1576 if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type
))
1578 tree gnu_real_ret_type
1579 = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (gnu_subprog_type
)));
1584 = maybe_pad_type (gnu_real_ret_type
,
1585 max_size (TYPE_SIZE (gnu_real_ret_type
), true),
1586 0, Etype (Name (gnat_node
)), "PAD", false,
1589 gnu_target
= create_tmp_var_raw (gnu_obj_type
, "LR");
1590 gnat_pushdecl (gnu_target
, gnat_node
);
1594 = tree_cons (NULL_TREE
,
1595 build_unary_op (ADDR_EXPR
, NULL_TREE
,
1596 unchecked_convert (gnu_real_ret_type
,
1603 /* The only way we can be making a call via an access type is if Name is an
1604 explicit dereference. In that case, get the list of formal args from the
1605 type the access type is pointing to. Otherwise, get the formals from
1606 entity being called. */
1607 if (Nkind (Name (gnat_node
)) == N_Explicit_Dereference
)
1608 gnat_formal
= First_Formal (Etype (Name (gnat_node
)));
1609 else if (Nkind (Name (gnat_node
)) == N_Attribute_Reference
)
1610 /* Assume here that this must be 'Elab_Body or 'Elab_Spec. */
1613 gnat_formal
= First_Formal (Entity (Name (gnat_node
)));
1615 /* Create the list of the actual parameters as GCC expects it, namely a chain
1616 of TREE_LIST nodes in which the TREE_VALUE field of each node is a
1617 parameter-expression and the TREE_PURPOSE field is null. Skip OUT
1618 parameters not passed by reference and don't need to be copied in. */
1619 for (gnat_actual
= First_Actual (gnat_node
);
1620 Present (gnat_actual
);
1621 gnat_formal
= Next_Formal_With_Extras (gnat_formal
),
1622 gnat_actual
= Next_Actual (gnat_actual
))
1624 tree gnu_formal_type
= gnat_to_gnu_type (Etype (gnat_formal
));
1625 /* We treat a conversion between aggregate types as if it is an
1626 unchecked conversion. */
1627 bool unchecked_convert_p
1628 = (Nkind (gnat_actual
) == N_Unchecked_Type_Conversion
1629 || (Nkind (gnat_actual
) == N_Type_Conversion
1630 && Is_Composite_Type (Underlying_Type (Etype (gnat_formal
)))));
1631 Node_Id gnat_name
= (unchecked_convert_p
1632 ? Expression (gnat_actual
) : gnat_actual
);
1633 tree gnu_name
= gnat_to_gnu (gnat_name
);
1634 tree gnu_name_type
= gnat_to_gnu_type (Etype (gnat_name
));
1636 = (present_gnu_tree (gnat_formal
)
1637 ? get_gnu_tree (gnat_formal
) : NULL_TREE
);
1640 /* If it's possible we may need to use this expression twice, make sure
1641 than any side-effects are handled via SAVE_EXPRs. Likewise if we need
1642 to force side-effects before the call.
1644 ??? This is more conservative than we need since we don't need to do
1645 this for pass-by-ref with no conversion. If we are passing a
1646 non-addressable Out or In Out parameter by reference, pass the address
1647 of a copy and set up to copy back out after the call. */
1648 if (Ekind (gnat_formal
) != E_In_Parameter
)
1650 gnu_name
= gnat_stabilize_reference (gnu_name
, true);
1651 if (!addressable_p (gnu_name
)
1653 && (DECL_BY_REF_P (gnu_formal
)
1654 || (TREE_CODE (gnu_formal
) == PARM_DECL
1655 && (DECL_BY_COMPONENT_PTR_P (gnu_formal
)
1656 || (DECL_BY_DESCRIPTOR_P (gnu_formal
))))))
1658 tree gnu_copy
= gnu_name
;
1661 /* Remove any unpadding on the actual and make a copy. But if
1662 the actual is a justified modular type, first convert
1664 if (TREE_CODE (gnu_name
) == COMPONENT_REF
1665 && ((TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_name
, 0)))
1667 && (TYPE_IS_PADDING_P
1668 (TREE_TYPE (TREE_OPERAND (gnu_name
, 0))))))
1669 gnu_name
= gnu_copy
= TREE_OPERAND (gnu_name
, 0);
1670 else if (TREE_CODE (gnu_name_type
) == RECORD_TYPE
1671 && (TYPE_JUSTIFIED_MODULAR_P (gnu_name_type
)))
1672 gnu_name
= convert (gnu_name_type
, gnu_name
);
1674 gnu_actual
= save_expr (gnu_name
);
1676 /* Since we're going to take the address of the SAVE_EXPR, we
1677 don't want it to be marked as unchanging. So set
1678 TREE_ADDRESSABLE. */
1679 gnu_temp
= skip_simple_arithmetic (gnu_actual
);
1680 if (TREE_CODE (gnu_temp
) == SAVE_EXPR
)
1682 TREE_ADDRESSABLE (gnu_temp
) = 1;
1683 TREE_READONLY (gnu_temp
) = 0;
1686 /* Set up to move the copy back to the original. */
1687 gnu_temp
= build2 (MODIFY_EXPR
, TREE_TYPE (gnu_copy
),
1688 gnu_copy
, gnu_actual
);
1689 annotate_with_node (gnu_temp
, gnat_actual
);
1690 append_to_statement_list (gnu_temp
, &gnu_after_list
);
1694 /* If this was a procedure call, we may not have removed any padding.
1695 So do it here for the part we will use as an input, if any. */
1696 gnu_actual
= gnu_name
;
1697 if (Ekind (gnat_formal
) != E_Out_Parameter
1698 && TREE_CODE (TREE_TYPE (gnu_actual
)) == RECORD_TYPE
1699 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_actual
)))
1700 gnu_actual
= convert (get_unpadded_type (Etype (gnat_actual
)),
1703 /* Unless this is an In parameter, we must remove any LJM building
1705 if (Ekind (gnat_formal
) != E_In_Parameter
1706 && TREE_CODE (gnu_name
) == CONSTRUCTOR
1707 && TREE_CODE (TREE_TYPE (gnu_name
)) == RECORD_TYPE
1708 && TYPE_JUSTIFIED_MODULAR_P (TREE_TYPE (gnu_name
)))
1709 gnu_name
= convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_name
))),
1712 if (Ekind (gnat_formal
) != E_Out_Parameter
1713 && !unchecked_convert_p
1714 && Do_Range_Check (gnat_actual
))
1715 gnu_actual
= emit_range_check (gnu_actual
, Etype (gnat_formal
));
1717 /* Do any needed conversions. We need only check for unchecked
1718 conversion since normal conversions will be handled by just
1719 converting to the formal type. */
1720 if (unchecked_convert_p
)
1723 = unchecked_convert (gnat_to_gnu_type (Etype (gnat_actual
)),
1725 (Nkind (gnat_actual
)
1726 == N_Unchecked_Type_Conversion
)
1727 && No_Truncation (gnat_actual
));
1729 /* One we've done the unchecked conversion, we still must ensure that
1730 the object is in range of the formal's type. */
1731 if (Ekind (gnat_formal
) != E_Out_Parameter
1732 && Do_Range_Check (gnat_actual
))
1733 gnu_actual
= emit_range_check (gnu_actual
,
1734 Etype (gnat_formal
));
1736 else if (TREE_CODE (gnu_actual
) != SAVE_EXPR
)
1737 /* We may have suppressed a conversion to the Etype of the actual since
1738 the parent is a procedure call. So add the conversion here. */
1739 gnu_actual
= convert (gnat_to_gnu_type (Etype (gnat_actual
)),
1742 if (TREE_CODE (gnu_actual
) != SAVE_EXPR
)
1743 gnu_actual
= convert (gnu_formal_type
, gnu_actual
);
1745 /* If we have not saved a GCC object for the formal, it means it is an
1746 OUT parameter not passed by reference and that does not need to be
1747 copied in. Otherwise, look at the PARM_DECL to see if it is passed by
1750 && TREE_CODE (gnu_formal
) == PARM_DECL
&& DECL_BY_REF_P (gnu_formal
))
1752 if (Ekind (gnat_formal
) != E_In_Parameter
)
1754 gnu_actual
= gnu_name
;
1756 /* If we have a padded type, be sure we've removed padding. */
1757 if (TREE_CODE (TREE_TYPE (gnu_actual
)) == RECORD_TYPE
1758 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_actual
))
1759 && TREE_CODE (gnu_actual
) != SAVE_EXPR
)
1760 gnu_actual
= convert (get_unpadded_type (Etype (gnat_actual
)),
1763 /* If we have the constructed subtype of an aliased object
1764 with an unconstrained nominal subtype, the type of the
1765 actual includes the template, although it is formally
1766 constrained. So we need to convert it back to the real
1767 constructed subtype to retrieve the constrained part
1768 and takes its address. */
1769 if (TREE_CODE (TREE_TYPE (gnu_actual
)) == RECORD_TYPE
1770 && TYPE_CONTAINS_TEMPLATE_P (TREE_TYPE (gnu_actual
))
1771 && TREE_CODE (gnu_actual
) != SAVE_EXPR
1772 && Is_Constr_Subt_For_UN_Aliased (Etype (gnat_actual
))
1773 && Is_Array_Type (Etype (gnat_actual
)))
1774 gnu_actual
= convert (gnat_to_gnu_type (Etype (gnat_actual
)),
1778 /* Otherwise, if we have a non-addressable COMPONENT_REF of a
1779 variable-size type see if it's doing a unpadding operation. If
1780 so, remove that operation since we have no way of allocating the
1781 required temporary. */
1782 if (TREE_CODE (gnu_actual
) == COMPONENT_REF
1783 && !TREE_CONSTANT (TYPE_SIZE (TREE_TYPE (gnu_actual
)))
1784 && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_actual
, 0)))
1786 && TYPE_IS_PADDING_P (TREE_TYPE
1787 (TREE_OPERAND (gnu_actual
, 0)))
1788 && !addressable_p (gnu_actual
))
1789 gnu_actual
= TREE_OPERAND (gnu_actual
, 0);
1791 /* The symmetry of the paths to the type of an entity is broken here
1792 since arguments don't know that they will be passed by ref. */
1793 gnu_formal_type
= TREE_TYPE (get_gnu_tree (gnat_formal
));
1794 gnu_actual
= build_unary_op (ADDR_EXPR
, gnu_formal_type
, gnu_actual
);
1796 else if (gnu_formal
&& TREE_CODE (gnu_formal
) == PARM_DECL
1797 && DECL_BY_COMPONENT_PTR_P (gnu_formal
))
1799 gnu_formal_type
= TREE_TYPE (get_gnu_tree (gnat_formal
));
1800 gnu_actual
= maybe_implicit_deref (gnu_actual
);
1801 gnu_actual
= maybe_unconstrained_array (gnu_actual
);
1803 if (TREE_CODE (gnu_formal_type
) == RECORD_TYPE
1804 && TYPE_IS_PADDING_P (gnu_formal_type
))
1806 gnu_formal_type
= TREE_TYPE (TYPE_FIELDS (gnu_formal_type
));
1807 gnu_actual
= convert (gnu_formal_type
, gnu_actual
);
1810 /* Take the address of the object and convert to the proper pointer
1811 type. We'd like to actually compute the address of the beginning
1812 of the array using an ADDR_EXPR of an ARRAY_REF, but there's a
1813 possibility that the ARRAY_REF might return a constant and we'd be
1814 getting the wrong address. Neither approach is exactly correct,
1815 but this is the most likely to work in all cases. */
1816 gnu_actual
= convert (gnu_formal_type
,
1817 build_unary_op (ADDR_EXPR
, NULL_TREE
,
1820 else if (gnu_formal
&& TREE_CODE (gnu_formal
) == PARM_DECL
1821 && DECL_BY_DESCRIPTOR_P (gnu_formal
))
1823 /* If arg is 'Null_Parameter, pass zero descriptor. */
1824 if ((TREE_CODE (gnu_actual
) == INDIRECT_REF
1825 || TREE_CODE (gnu_actual
) == UNCONSTRAINED_ARRAY_REF
)
1826 && TREE_PRIVATE (gnu_actual
))
1827 gnu_actual
= convert (DECL_ARG_TYPE (get_gnu_tree (gnat_formal
)),
1830 gnu_actual
= build_unary_op (ADDR_EXPR
, NULL_TREE
,
1831 fill_vms_descriptor (gnu_actual
,
1836 tree gnu_actual_size
= TYPE_SIZE (TREE_TYPE (gnu_actual
));
1838 if (Ekind (gnat_formal
) != E_In_Parameter
)
1839 gnu_name_list
= tree_cons (NULL_TREE
, gnu_name
, gnu_name_list
);
1841 if (!gnu_formal
|| TREE_CODE (gnu_formal
) != PARM_DECL
)
1844 /* If this is 'Null_Parameter, pass a zero even though we are
1845 dereferencing it. */
1846 else if (TREE_CODE (gnu_actual
) == INDIRECT_REF
1847 && TREE_PRIVATE (gnu_actual
)
1848 && host_integerp (gnu_actual_size
, 1)
1849 && 0 >= compare_tree_int (gnu_actual_size
,
1852 = unchecked_convert (DECL_ARG_TYPE (gnu_formal
),
1853 convert (gnat_type_for_size
1854 (tree_low_cst (gnu_actual_size
, 1),
1860 = convert (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (gnu_formal
)),
1864 gnu_actual_list
= tree_cons (NULL_TREE
, gnu_actual
, gnu_actual_list
);
1867 gnu_subprog_call
= build3 (CALL_EXPR
, TREE_TYPE (gnu_subprog_type
),
1868 gnu_subprog_addr
, nreverse (gnu_actual_list
),
1871 /* If we return by passing a target, we emit the call and return the target
1873 if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type
))
1875 add_stmt_with_node (gnu_subprog_call
, gnat_node
);
1877 = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (gnu_subprog_type
)));
1878 return unchecked_convert (*gnu_result_type_p
, gnu_target
, false);
1881 /* If it is a function call, the result is the call expression unless
1882 a target is specified, in which case we copy the result into the target
1883 and return the assignment statement. */
1884 else if (Nkind (gnat_node
) == N_Function_Call
)
1886 gnu_result
= gnu_subprog_call
;
1888 /* If the function returns an unconstrained array or by reference,
1889 we have to de-dereference the pointer. */
1890 if (TYPE_RETURNS_UNCONSTRAINED_P (gnu_subprog_type
)
1891 || TYPE_RETURNS_BY_REF_P (gnu_subprog_type
))
1892 gnu_result
= build_unary_op (INDIRECT_REF
, NULL_TREE
, gnu_result
);
1895 gnu_result
= build_binary_op (MODIFY_EXPR
, NULL_TREE
,
1896 gnu_target
, gnu_result
);
1898 *gnu_result_type_p
= get_unpadded_type (Etype (gnat_node
));
1903 /* If this is the case where the GNAT tree contains a procedure call
1904 but the Ada procedure has copy in copy out parameters, the special
1905 parameter passing mechanism must be used. */
1906 else if (TYPE_CI_CO_LIST (gnu_subprog_type
) != NULL_TREE
)
1908 /* List of FIELD_DECLs associated with the PARM_DECLs of the copy
1909 in copy out parameters. */
1910 tree scalar_return_list
= TYPE_CI_CO_LIST (gnu_subprog_type
);
1911 int length
= list_length (scalar_return_list
);
1917 gnu_subprog_call
= save_expr (gnu_subprog_call
);
1918 gnu_name_list
= nreverse (gnu_name_list
);
1920 /* If any of the names had side-effects, ensure they are all
1921 evaluated before the call. */
1922 for (gnu_name
= gnu_name_list
; gnu_name
;
1923 gnu_name
= TREE_CHAIN (gnu_name
))
1924 if (TREE_SIDE_EFFECTS (TREE_VALUE (gnu_name
)))
1925 append_to_statement_list (TREE_VALUE (gnu_name
),
1929 if (Nkind (Name (gnat_node
)) == N_Explicit_Dereference
)
1930 gnat_formal
= First_Formal (Etype (Name (gnat_node
)));
1932 gnat_formal
= First_Formal (Entity (Name (gnat_node
)));
1934 for (gnat_actual
= First_Actual (gnat_node
);
1935 Present (gnat_actual
);
1936 gnat_formal
= Next_Formal_With_Extras (gnat_formal
),
1937 gnat_actual
= Next_Actual (gnat_actual
))
1938 /* If we are dealing with a copy in copy out parameter, we must
1939 retrieve its value from the record returned in the call. */
1940 if (!(present_gnu_tree (gnat_formal
)
1941 && TREE_CODE (get_gnu_tree (gnat_formal
)) == PARM_DECL
1942 && (DECL_BY_REF_P (get_gnu_tree (gnat_formal
))
1943 || (TREE_CODE (get_gnu_tree (gnat_formal
)) == PARM_DECL
1944 && ((DECL_BY_COMPONENT_PTR_P (get_gnu_tree (gnat_formal
))
1945 || (DECL_BY_DESCRIPTOR_P
1946 (get_gnu_tree (gnat_formal
))))))))
1947 && Ekind (gnat_formal
) != E_In_Parameter
)
1949 /* Get the value to assign to this OUT or IN OUT parameter. It is
1950 either the result of the function if there is only a single such
1951 parameter or the appropriate field from the record returned. */
1953 = length
== 1 ? gnu_subprog_call
1954 : build_component_ref (gnu_subprog_call
, NULL_TREE
,
1955 TREE_PURPOSE (scalar_return_list
),
1957 bool unchecked_conversion
= (Nkind (gnat_actual
)
1958 == N_Unchecked_Type_Conversion
);
1959 /* If the actual is a conversion, get the inner expression, which
1960 will be the real destination, and convert the result to the
1961 type of the actual parameter. */
1963 = maybe_unconstrained_array (TREE_VALUE (gnu_name_list
));
1965 /* If the result is a padded type, remove the padding. */
1966 if (TREE_CODE (TREE_TYPE (gnu_result
)) == RECORD_TYPE
1967 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_result
)))
1968 gnu_result
= convert (TREE_TYPE (TYPE_FIELDS
1969 (TREE_TYPE (gnu_result
))),
1972 /* If the result is a type conversion, do it. */
1973 if (Nkind (gnat_actual
) == N_Type_Conversion
)
1975 = convert_with_check
1976 (Etype (Expression (gnat_actual
)), gnu_result
,
1977 Do_Overflow_Check (gnat_actual
),
1978 Do_Range_Check (Expression (gnat_actual
)),
1979 Float_Truncate (gnat_actual
));
1981 else if (unchecked_conversion
)
1982 gnu_result
= unchecked_convert (TREE_TYPE (gnu_actual
),
1984 No_Truncation (gnat_actual
));
1987 if (Do_Range_Check (gnat_actual
))
1988 gnu_result
= emit_range_check (gnu_result
,
1989 Etype (gnat_actual
));
1991 if (!(!TREE_CONSTANT (TYPE_SIZE (TREE_TYPE (gnu_actual
)))
1992 && TREE_CONSTANT (TYPE_SIZE (TREE_TYPE (gnu_result
)))))
1993 gnu_result
= convert (TREE_TYPE (gnu_actual
), gnu_result
);
1996 gnu_result
= build_binary_op (MODIFY_EXPR
, NULL_TREE
,
1997 gnu_actual
, gnu_result
);
1998 annotate_with_node (gnu_result
, gnat_actual
);
1999 append_to_statement_list (gnu_result
, &gnu_before_list
);
2000 scalar_return_list
= TREE_CHAIN (scalar_return_list
);
2001 gnu_name_list
= TREE_CHAIN (gnu_name_list
);
2006 annotate_with_node (gnu_subprog_call
, gnat_node
);
2007 append_to_statement_list (gnu_subprog_call
, &gnu_before_list
);
2010 append_to_statement_list (gnu_after_list
, &gnu_before_list
);
2011 return gnu_before_list
;
2014 /* Subroutine of gnat_to_gnu to translate gnat_node, an
2015 N_Handled_Sequence_Of_Statements, to a GCC tree, which is returned. */
2018 Handled_Sequence_Of_Statements_to_gnu (Node_Id gnat_node
)
2020 tree gnu_jmpsave_decl
= NULL_TREE
;
2021 tree gnu_jmpbuf_decl
= NULL_TREE
;
2022 /* If just annotating, ignore all EH and cleanups. */
2023 bool gcc_zcx
= (!type_annotate_only
2024 && Present (Exception_Handlers (gnat_node
))
2025 && Exception_Mechanism
== GCC_ZCX
);
2027 = (!type_annotate_only
&& Present (Exception_Handlers (gnat_node
))
2028 && Exception_Mechanism
== Setjmp_Longjmp
);
2029 bool at_end
= !type_annotate_only
&& Present (At_End_Proc (gnat_node
));
2030 bool binding_for_block
= (at_end
|| gcc_zcx
|| setjmp_longjmp
);
2031 tree gnu_inner_block
; /* The statement(s) for the block itself. */
2036 /* The GCC exception handling mechanism can handle both ZCX and SJLJ schemes
2037 and we have our own SJLJ mechanism. To call the GCC mechanism, we call
2038 add_cleanup, and when we leave the binding, end_stmt_group will create
2039 the TRY_FINALLY_EXPR.
2041 ??? The region level calls down there have been specifically put in place
2042 for a ZCX context and currently the order in which things are emitted
2043 (region/handlers) is different from the SJLJ case. Instead of putting
2044 other calls with different conditions at other places for the SJLJ case,
2045 it seems cleaner to reorder things for the SJLJ case and generalize the
2046 condition to make it not ZCX specific.
2048 If there are any exceptions or cleanup processing involved, we need an
2049 outer statement group (for Setjmp_Longjmp) and binding level. */
2050 if (binding_for_block
)
2052 start_stmt_group ();
2056 /* If we are to call a function when exiting this block add a cleanup
2057 to the binding level we made above. */
2059 add_cleanup (build_call_0_expr (gnat_to_gnu (At_End_Proc (gnat_node
))));
2061 /* If using setjmp_longjmp, make the variables for the setjmp buffer and save
2062 area for address of previous buffer. Do this first since we need to have
2063 the setjmp buf known for any decls in this block. */
2066 gnu_jmpsave_decl
= create_var_decl (get_identifier ("JMPBUF_SAVE"),
2067 NULL_TREE
, jmpbuf_ptr_type
,
2068 build_call_0_expr (get_jmpbuf_decl
),
2069 false, false, false, false, NULL
,
2071 gnu_jmpbuf_decl
= create_var_decl (get_identifier ("JMP_BUF"),
2072 NULL_TREE
, jmpbuf_type
,
2073 NULL_TREE
, false, false, false, false,
2076 set_block_jmpbuf_decl (gnu_jmpbuf_decl
);
2078 /* When we exit this block, restore the saved value. */
2079 add_cleanup (build_call_1_expr (set_jmpbuf_decl
, gnu_jmpsave_decl
));
2082 /* Now build the tree for the declarations and statements inside this block.
2083 If this is SJLJ, set our jmp_buf as the current buffer. */
2084 start_stmt_group ();
2087 add_stmt (build_call_1_expr (set_jmpbuf_decl
,
2088 build_unary_op (ADDR_EXPR
, NULL_TREE
,
2091 if (Present (First_Real_Statement (gnat_node
)))
2092 process_decls (Statements (gnat_node
), Empty
,
2093 First_Real_Statement (gnat_node
), true, true);
2095 /* Generate code for each statement in the block. */
2096 for (gnat_temp
= (Present (First_Real_Statement (gnat_node
))
2097 ? First_Real_Statement (gnat_node
)
2098 : First (Statements (gnat_node
)));
2099 Present (gnat_temp
); gnat_temp
= Next (gnat_temp
))
2100 add_stmt (gnat_to_gnu (gnat_temp
));
2101 gnu_inner_block
= end_stmt_group ();
2103 /* Now generate code for the two exception models, if either is relevant for
2107 tree
*gnu_else_ptr
= 0;
2110 /* Make a binding level for the exception handling declarations and code
2111 and set up gnu_except_ptr_stack for the handlers to use. */
2112 start_stmt_group ();
2115 push_stack (&gnu_except_ptr_stack
, NULL_TREE
,
2116 create_var_decl (get_identifier ("EXCEPT_PTR"),
2118 build_pointer_type (except_type_node
),
2119 build_call_0_expr (get_excptr_decl
), false,
2120 false, false, false, NULL
, gnat_node
));
2122 /* Generate code for each handler. The N_Exception_Handler case does the
2123 real work and returns a COND_EXPR for each handler, which we chain
2125 for (gnat_temp
= First_Non_Pragma (Exception_Handlers (gnat_node
));
2126 Present (gnat_temp
); gnat_temp
= Next_Non_Pragma (gnat_temp
))
2128 gnu_expr
= gnat_to_gnu (gnat_temp
);
2130 /* If this is the first one, set it as the outer one. Otherwise,
2131 point the "else" part of the previous handler to us. Then point
2132 to our "else" part. */
2134 add_stmt (gnu_expr
);
2136 *gnu_else_ptr
= gnu_expr
;
2138 gnu_else_ptr
= &COND_EXPR_ELSE (gnu_expr
);
2141 /* If none of the exception handlers did anything, re-raise but do not
2143 gnu_expr
= build_call_1_expr (raise_nodefer_decl
,
2144 TREE_VALUE (gnu_except_ptr_stack
));
2145 annotate_with_node (gnu_expr
, gnat_node
);
2148 *gnu_else_ptr
= gnu_expr
;
2150 add_stmt (gnu_expr
);
2152 /* End the binding level dedicated to the exception handlers and get the
2153 whole statement group. */
2154 pop_stack (&gnu_except_ptr_stack
);
2156 gnu_handler
= end_stmt_group ();
2158 /* If the setjmp returns 1, we restore our incoming longjmp value and
2159 then check the handlers. */
2160 start_stmt_group ();
2161 add_stmt_with_node (build_call_1_expr (set_jmpbuf_decl
,
2164 add_stmt (gnu_handler
);
2165 gnu_handler
= end_stmt_group ();
2167 /* This block is now "if (setjmp) ... <handlers> else <block>". */
2168 gnu_result
= build3 (COND_EXPR
, void_type_node
,
2171 build_unary_op (ADDR_EXPR
, NULL_TREE
,
2173 gnu_handler
, gnu_inner_block
);
2179 /* First make a block containing the handlers. */
2180 start_stmt_group ();
2181 for (gnat_temp
= First_Non_Pragma (Exception_Handlers (gnat_node
));
2182 Present (gnat_temp
);
2183 gnat_temp
= Next_Non_Pragma (gnat_temp
))
2184 add_stmt (gnat_to_gnu (gnat_temp
));
2185 gnu_handlers
= end_stmt_group ();
2187 /* Now make the TRY_CATCH_EXPR for the block. */
2188 gnu_result
= build2 (TRY_CATCH_EXPR
, void_type_node
,
2189 gnu_inner_block
, gnu_handlers
);
2192 gnu_result
= gnu_inner_block
;
2194 /* Now close our outer block, if we had to make one. */
2195 if (binding_for_block
)
2197 add_stmt (gnu_result
);
2199 gnu_result
= end_stmt_group ();
2205 /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Exception_Handler,
2206 to a GCC tree, which is returned. This is the variant for Setjmp_Longjmp
2207 exception handling. */
2210 Exception_Handler_to_gnu_sjlj (Node_Id gnat_node
)
2212 /* Unless this is "Others" or the special "Non-Ada" exception for Ada, make
2213 an "if" statement to select the proper exceptions. For "Others", exclude
2214 exceptions where Handled_By_Others is nonzero unless the All_Others flag
2215 is set. For "Non-ada", accept an exception if "Lang" is 'V'. */
2216 tree gnu_choice
= integer_zero_node
;
2217 tree gnu_body
= build_stmt_group (Statements (gnat_node
), false);
2220 for (gnat_temp
= First (Exception_Choices (gnat_node
));
2221 gnat_temp
; gnat_temp
= Next (gnat_temp
))
2225 if (Nkind (gnat_temp
) == N_Others_Choice
)
2227 if (All_Others (gnat_temp
))
2228 this_choice
= integer_one_node
;
2232 (EQ_EXPR
, integer_type_node
,
2237 (INDIRECT_REF
, NULL_TREE
,
2238 TREE_VALUE (gnu_except_ptr_stack
)),
2239 get_identifier ("not_handled_by_others"), NULL_TREE
,
2244 else if (Nkind (gnat_temp
) == N_Identifier
2245 || Nkind (gnat_temp
) == N_Expanded_Name
)
2248 = gnat_to_gnu_entity (Entity (gnat_temp
), NULL_TREE
, 0);
2252 (EQ_EXPR
, integer_type_node
, TREE_VALUE (gnu_except_ptr_stack
),
2253 convert (TREE_TYPE (TREE_VALUE (gnu_except_ptr_stack
)),
2254 build_unary_op (ADDR_EXPR
, NULL_TREE
, gnu_expr
)));
2256 /* If this is the distinguished exception "Non_Ada_Error" (and we are
2257 in VMS mode), also allow a non-Ada exception (a VMS condition) t
2259 if (Is_Non_Ada_Error (Entity (gnat_temp
)))
2262 = build_component_ref
2263 (build_unary_op (INDIRECT_REF
, NULL_TREE
,
2264 TREE_VALUE (gnu_except_ptr_stack
)),
2265 get_identifier ("lang"), NULL_TREE
, false);
2269 (TRUTH_ORIF_EXPR
, integer_type_node
,
2270 build_binary_op (EQ_EXPR
, integer_type_node
, gnu_comp
,
2271 build_int_cst (TREE_TYPE (gnu_comp
), 'V')),
2278 gnu_choice
= build_binary_op (TRUTH_ORIF_EXPR
, integer_type_node
,
2279 gnu_choice
, this_choice
);
2282 return build3 (COND_EXPR
, void_type_node
, gnu_choice
, gnu_body
, NULL_TREE
);
2285 /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Exception_Handler,
2286 to a GCC tree, which is returned. This is the variant for ZCX. */
2289 Exception_Handler_to_gnu_zcx (Node_Id gnat_node
)
2291 tree gnu_etypes_list
= NULL_TREE
;
2294 tree gnu_current_exc_ptr
;
2295 tree gnu_incoming_exc_ptr
;
2298 /* We build a TREE_LIST of nodes representing what exception types this
2299 handler can catch, with special cases for others and all others cases.
2301 Each exception type is actually identified by a pointer to the exception
2302 id, with special value zero for "others" and one for "all others". Beware
2303 that these special values are known and used by the personality routine to
2304 identify the corresponding specific kinds of handlers.
2306 ??? For initial time frame reasons, the others and all_others cases have
2307 been handled using specific type trees, but this somehow hides information
2308 from the back-end, which expects NULL to be passed for catch all and
2309 end_cleanup to be used for cleanups.
2311 Care should be taken to ensure that the control flow impact of such
2312 clauses is rendered in some way. lang_eh_type_covers is doing the trick
2314 for (gnat_temp
= First (Exception_Choices (gnat_node
));
2315 gnat_temp
; gnat_temp
= Next (gnat_temp
))
2317 if (Nkind (gnat_temp
) == N_Others_Choice
)
2318 gnu_etype
= (All_Others (gnat_temp
) ? integer_one_node
2319 : integer_zero_node
);
2320 else if (Nkind (gnat_temp
) == N_Identifier
2321 || Nkind (gnat_temp
) == N_Expanded_Name
)
2323 Entity_Id gnat_ex_id
= Entity (gnat_temp
);
2325 /* Exception may be a renaming. Recover original exception which is
2326 the one elaborated and registered. */
2327 if (Present (Renamed_Object (gnat_ex_id
)))
2328 gnat_ex_id
= Renamed_Object (gnat_ex_id
);
2330 gnu_expr
= gnat_to_gnu_entity (gnat_ex_id
, NULL_TREE
, 0);
2331 gnu_etype
= build_unary_op (ADDR_EXPR
, NULL_TREE
, gnu_expr
);
2333 /* The Non_Ada_Error case for VMS exceptions is handled
2334 by the personality routine. */
2339 /* The GCC interface expects NULL to be passed for catch all handlers, so
2340 it would be quite tempting to set gnu_etypes_list to NULL if gnu_etype
2341 is integer_zero_node. It would not work, however, because GCC's
2342 notion of "catch all" is stronger than our notion of "others". Until
2343 we correctly use the cleanup interface as well, doing that would
2344 prevent the "all others" handlers from beeing seen, because nothing
2345 can be caught beyond a catch all from GCC's point of view. */
2346 gnu_etypes_list
= tree_cons (NULL_TREE
, gnu_etype
, gnu_etypes_list
);
2349 start_stmt_group ();
2352 /* Expand a call to the begin_handler hook at the beginning of the handler,
2353 and arrange for a call to the end_handler hook to occur on every possible
2356 The hooks expect a pointer to the low level occurrence. This is required
2357 for our stack management scheme because a raise inside the handler pushes
2358 a new occurrence on top of the stack, which means that this top does not
2359 necessarily match the occurrence this handler was dealing with.
2361 The EXC_PTR_EXPR object references the exception occurrence being
2362 propagated. Upon handler entry, this is the exception for which the
2363 handler is triggered. This might not be the case upon handler exit,
2364 however, as we might have a new occurrence propagated by the handler's
2365 body, and the end_handler hook called as a cleanup in this context.
2367 We use a local variable to retrieve the incoming value at handler entry
2368 time, and reuse it to feed the end_handler hook's argument at exit. */
2369 gnu_current_exc_ptr
= build0 (EXC_PTR_EXPR
, ptr_type_node
);
2370 gnu_incoming_exc_ptr
= create_var_decl (get_identifier ("EXPTR"), NULL_TREE
,
2371 ptr_type_node
, gnu_current_exc_ptr
,
2372 false, false, false, false, NULL
,
2375 add_stmt_with_node (build_call_1_expr (begin_handler_decl
,
2376 gnu_incoming_exc_ptr
),
2378 add_cleanup (build_call_1_expr (end_handler_decl
, gnu_incoming_exc_ptr
));
2379 add_stmt_list (Statements (gnat_node
));
2382 return build2 (CATCH_EXPR
, void_type_node
, gnu_etypes_list
,
2386 /* Subroutine of gnat_to_gnu to generate code for an N_Compilation unit. */
2389 Compilation_Unit_to_gnu (Node_Id gnat_node
)
2391 /* Make the decl for the elaboration procedure. */
2392 bool body_p
= (Defining_Entity (Unit (gnat_node
)),
2393 Nkind (Unit (gnat_node
)) == N_Package_Body
2394 || Nkind (Unit (gnat_node
)) == N_Subprogram_Body
);
2395 Entity_Id gnat_unit_entity
= Defining_Entity (Unit (gnat_node
));
2396 tree gnu_elab_proc_decl
2397 = create_subprog_decl
2398 (create_concat_name (gnat_unit_entity
,
2399 body_p
? "elabb" : "elabs"),
2400 NULL_TREE
, void_ftype
, NULL_TREE
, false, true, false, NULL
,
2402 struct elab_info
*info
;
2404 push_stack (&gnu_elab_proc_stack
, NULL_TREE
, gnu_elab_proc_decl
);
2406 DECL_ELABORATION_PROC_P (gnu_elab_proc_decl
) = 1;
2407 allocate_struct_function (gnu_elab_proc_decl
);
2408 Sloc_to_locus (Sloc (gnat_unit_entity
), &cfun
->function_end_locus
);
2411 /* For a body, first process the spec if there is one. */
2412 if (Nkind (Unit (gnat_node
)) == N_Package_Body
2413 || (Nkind (Unit (gnat_node
)) == N_Subprogram_Body
2414 && !Acts_As_Spec (gnat_node
)))
2415 add_stmt (gnat_to_gnu (Library_Unit (gnat_node
)));
2417 process_inlined_subprograms (gnat_node
);
2419 if (type_annotate_only
)
2421 elaborate_all_entities (gnat_node
);
2423 if (Nkind (Unit (gnat_node
)) == N_Subprogram_Declaration
2424 || Nkind (Unit (gnat_node
)) == N_Generic_Package_Declaration
2425 || Nkind (Unit (gnat_node
)) == N_Generic_Subprogram_Declaration
)
2429 process_decls (Declarations (Aux_Decls_Node (gnat_node
)), Empty
, Empty
,
2431 add_stmt (gnat_to_gnu (Unit (gnat_node
)));
2433 /* Process any pragmas and actions following the unit. */
2434 add_stmt_list (Pragmas_After (Aux_Decls_Node (gnat_node
)));
2435 add_stmt_list (Actions (Aux_Decls_Node (gnat_node
)));
2437 /* Save away what we've made so far and record this potential elaboration
2439 info
= (struct elab_info
*) ggc_alloc (sizeof (struct elab_info
));
2440 set_current_block_context (gnu_elab_proc_decl
);
2442 DECL_SAVED_TREE (gnu_elab_proc_decl
) = end_stmt_group ();
2443 info
->next
= elab_info_list
;
2444 info
->elab_proc
= gnu_elab_proc_decl
;
2445 info
->gnat_node
= gnat_node
;
2446 elab_info_list
= info
;
2448 /* Generate elaboration code for this unit, if necessary, and say whether
2450 pop_stack (&gnu_elab_proc_stack
);
2453 /* This function is the driver of the GNAT to GCC tree transformation
2454 process. It is the entry point of the tree transformer. GNAT_NODE is the
2455 root of some GNAT tree. Return the root of the corresponding GCC tree.
2456 If this is an expression, return the GCC equivalent of the expression. If
2457 it is a statement, return the statement. In the case when called for a
2458 statement, it may also add statements to the current statement group, in
2459 which case anything it returns is to be interpreted as occuring after
2460 anything `it already added. */
2463 gnat_to_gnu (Node_Id gnat_node
)
2465 bool went_into_elab_proc
= false;
2466 tree gnu_result
= error_mark_node
; /* Default to no value. */
2467 tree gnu_result_type
= void_type_node
;
2469 tree gnu_lhs
, gnu_rhs
;
2472 /* Save node number for error message and set location information. */
2473 error_gnat_node
= gnat_node
;
2474 Sloc_to_locus (Sloc (gnat_node
), &input_location
);
2476 if (type_annotate_only
2477 && IN (Nkind (gnat_node
), N_Statement_Other_Than_Procedure_Call
))
2478 return alloc_stmt_list ();
2480 /* If this node is a non-static subexpression and we are only
2481 annotating types, make this into a NULL_EXPR. */
2482 if (type_annotate_only
2483 && IN (Nkind (gnat_node
), N_Subexpr
)
2484 && Nkind (gnat_node
) != N_Identifier
2485 && !Compile_Time_Known_Value (gnat_node
))
2486 return build1 (NULL_EXPR
, get_unpadded_type (Etype (gnat_node
)),
2487 build_call_raise (CE_Range_Check_Failed
));
2489 /* If this is a Statement and we are at top level, it must be part of
2490 the elaboration procedure, so mark us as being in that procedure
2491 and push our context. */
2492 if (!current_function_decl
2493 && ((IN (Nkind (gnat_node
), N_Statement_Other_Than_Procedure_Call
)
2494 && Nkind (gnat_node
) != N_Null_Statement
)
2495 || Nkind (gnat_node
) == N_Procedure_Call_Statement
2496 || Nkind (gnat_node
) == N_Label
2497 || Nkind (gnat_node
) == N_Implicit_Label_Declaration
2498 || Nkind (gnat_node
) == N_Handled_Sequence_Of_Statements
2499 || ((Nkind (gnat_node
) == N_Raise_Constraint_Error
2500 || Nkind (gnat_node
) == N_Raise_Storage_Error
2501 || Nkind (gnat_node
) == N_Raise_Program_Error
)
2502 && (Ekind (Etype (gnat_node
)) == E_Void
))))
2504 current_function_decl
= TREE_VALUE (gnu_elab_proc_stack
);
2505 start_stmt_group ();
2507 went_into_elab_proc
= true;
2510 switch (Nkind (gnat_node
))
2512 /********************************/
2513 /* Chapter 2: Lexical Elements: */
2514 /********************************/
2517 case N_Expanded_Name
:
2518 case N_Operator_Symbol
:
2519 case N_Defining_Identifier
:
2520 gnu_result
= Identifier_to_gnu (gnat_node
, &gnu_result_type
);
2523 case N_Integer_Literal
:
2527 /* Get the type of the result, looking inside any padding and
2528 justified modular types. Then get the value in that type. */
2529 gnu_type
= gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
2531 if (TREE_CODE (gnu_type
) == RECORD_TYPE
2532 && TYPE_JUSTIFIED_MODULAR_P (gnu_type
))
2533 gnu_type
= TREE_TYPE (TYPE_FIELDS (gnu_type
));
2535 gnu_result
= UI_To_gnu (Intval (gnat_node
), gnu_type
);
2537 /* If the result overflows (meaning it doesn't fit in its base type),
2538 abort. We would like to check that the value is within the range
2539 of the subtype, but that causes problems with subtypes whose usage
2540 will raise Constraint_Error and with biased representation, so
2542 gcc_assert (!TREE_CONSTANT_OVERFLOW (gnu_result
));
2546 case N_Character_Literal
:
2547 /* If a Entity is present, it means that this was one of the
2548 literals in a user-defined character type. In that case,
2549 just return the value in the CONST_DECL. Otherwise, use the
2550 character code. In that case, the base type should be an
2551 INTEGER_TYPE, but we won't bother checking for that. */
2552 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
2553 if (Present (Entity (gnat_node
)))
2554 gnu_result
= DECL_INITIAL (get_gnu_tree (Entity (gnat_node
)));
2558 (build_int_cst (gnu_result_type
, Char_Literal_Value (gnat_node
)),
2559 false, false, false);
2562 case N_Real_Literal
:
2563 /* If this is of a fixed-point type, the value we want is the
2564 value of the corresponding integer. */
2565 if (IN (Ekind (Underlying_Type (Etype (gnat_node
))), Fixed_Point_Kind
))
2567 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
2568 gnu_result
= UI_To_gnu (Corresponding_Integer_Value (gnat_node
),
2570 gcc_assert (!TREE_CONSTANT_OVERFLOW (gnu_result
));
2573 /* We should never see a Vax_Float type literal, since the front end
2574 is supposed to transform these using appropriate conversions */
2575 else if (Vax_Float (Underlying_Type (Etype (gnat_node
))))
2580 Ureal ur_realval
= Realval (gnat_node
);
2582 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
2584 /* If the real value is zero, so is the result. Otherwise,
2585 convert it to a machine number if it isn't already. That
2586 forces BASE to 0 or 2 and simplifies the rest of our logic. */
2587 if (UR_Is_Zero (ur_realval
))
2588 gnu_result
= convert (gnu_result_type
, integer_zero_node
);
2591 if (!Is_Machine_Number (gnat_node
))
2593 = Machine (Base_Type (Underlying_Type (Etype (gnat_node
))),
2594 ur_realval
, Round_Even
, gnat_node
);
2597 = UI_To_gnu (Numerator (ur_realval
), gnu_result_type
);
2599 /* If we have a base of zero, divide by the denominator.
2600 Otherwise, the base must be 2 and we scale the value, which
2601 we know can fit in the mantissa of the type (hence the use
2602 of that type above). */
2603 if (No (Rbase (ur_realval
)))
2605 = build_binary_op (RDIV_EXPR
,
2606 get_base_type (gnu_result_type
),
2608 UI_To_gnu (Denominator (ur_realval
),
2612 REAL_VALUE_TYPE tmp
;
2614 gcc_assert (Rbase (ur_realval
) == 2);
2615 real_ldexp (&tmp
, &TREE_REAL_CST (gnu_result
),
2616 - UI_To_Int (Denominator (ur_realval
)));
2617 gnu_result
= build_real (gnu_result_type
, tmp
);
2621 /* Now see if we need to negate the result. Do it this way to
2622 properly handle -0. */
2623 if (UR_Is_Negative (Realval (gnat_node
)))
2625 = build_unary_op (NEGATE_EXPR
, get_base_type (gnu_result_type
),
2631 case N_String_Literal
:
2632 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
2633 if (TYPE_PRECISION (TREE_TYPE (gnu_result_type
)) == HOST_BITS_PER_CHAR
)
2635 String_Id gnat_string
= Strval (gnat_node
);
2636 int length
= String_Length (gnat_string
);
2637 char *string
= (char *) alloca (length
+ 1);
2640 /* Build the string with the characters in the literal. Note
2641 that Ada strings are 1-origin. */
2642 for (i
= 0; i
< length
; i
++)
2643 string
[i
] = Get_String_Char (gnat_string
, i
+ 1);
2645 /* Put a null at the end of the string in case it's in a context
2646 where GCC will want to treat it as a C string. */
2649 gnu_result
= build_string (length
, string
);
2651 /* Strings in GCC don't normally have types, but we want
2652 this to not be converted to the array type. */
2653 TREE_TYPE (gnu_result
) = gnu_result_type
;
2657 /* Build a list consisting of each character, then make
2659 String_Id gnat_string
= Strval (gnat_node
);
2660 int length
= String_Length (gnat_string
);
2662 tree gnu_list
= NULL_TREE
;
2663 tree gnu_idx
= TYPE_MIN_VALUE (TYPE_DOMAIN (gnu_result_type
));
2665 for (i
= 0; i
< length
; i
++)
2668 = tree_cons (gnu_idx
,
2669 build_int_cst (TREE_TYPE (gnu_result_type
),
2670 Get_String_Char (gnat_string
,
2674 gnu_idx
= int_const_binop (PLUS_EXPR
, gnu_idx
, integer_one_node
,
2679 = gnat_build_constructor (gnu_result_type
, nreverse (gnu_list
));
2684 gnu_result
= Pragma_to_gnu (gnat_node
);
2687 /**************************************/
2688 /* Chapter 3: Declarations and Types: */
2689 /**************************************/
2691 case N_Subtype_Declaration
:
2692 case N_Full_Type_Declaration
:
2693 case N_Incomplete_Type_Declaration
:
2694 case N_Private_Type_Declaration
:
2695 case N_Private_Extension_Declaration
:
2696 case N_Task_Type_Declaration
:
2697 process_type (Defining_Entity (gnat_node
));
2698 gnu_result
= alloc_stmt_list ();
2701 case N_Object_Declaration
:
2702 case N_Exception_Declaration
:
2703 gnat_temp
= Defining_Entity (gnat_node
);
2704 gnu_result
= alloc_stmt_list ();
2706 /* If we are just annotating types and this object has an unconstrained
2707 or task type, don't elaborate it. */
2708 if (type_annotate_only
2709 && (((Is_Array_Type (Etype (gnat_temp
))
2710 || Is_Record_Type (Etype (gnat_temp
)))
2711 && !Is_Constrained (Etype (gnat_temp
)))
2712 || Is_Concurrent_Type (Etype (gnat_temp
))))
2715 if (Present (Expression (gnat_node
))
2716 && !(Nkind (gnat_node
) == N_Object_Declaration
2717 && No_Initialization (gnat_node
))
2718 && (!type_annotate_only
2719 || Compile_Time_Known_Value (Expression (gnat_node
))))
2721 gnu_expr
= gnat_to_gnu (Expression (gnat_node
));
2722 if (Do_Range_Check (Expression (gnat_node
)))
2723 gnu_expr
= emit_range_check (gnu_expr
, Etype (gnat_temp
));
2725 /* If this object has its elaboration delayed, we must force
2726 evaluation of GNU_EXPR right now and save it for when the object
2728 if (Present (Freeze_Node (gnat_temp
)))
2730 if ((Is_Public (gnat_temp
) || global_bindings_p ())
2731 && !TREE_CONSTANT (gnu_expr
))
2733 = create_var_decl (create_concat_name (gnat_temp
, "init"),
2734 NULL_TREE
, TREE_TYPE (gnu_expr
),
2735 gnu_expr
, false, Is_Public (gnat_temp
),
2736 false, false, NULL
, gnat_temp
);
2738 gnu_expr
= maybe_variable (gnu_expr
);
2740 save_gnu_tree (gnat_node
, gnu_expr
, true);
2744 gnu_expr
= NULL_TREE
;
2746 if (type_annotate_only
&& gnu_expr
&& TREE_CODE (gnu_expr
) == ERROR_MARK
)
2747 gnu_expr
= NULL_TREE
;
2749 if (No (Freeze_Node (gnat_temp
)))
2750 gnat_to_gnu_entity (gnat_temp
, gnu_expr
, 1);
2753 case N_Object_Renaming_Declaration
:
2754 gnat_temp
= Defining_Entity (gnat_node
);
2756 /* Don't do anything if this renaming is handled by the front end. or if
2757 we are just annotating types and this object has a composite or task
2758 type, don't elaborate it. We return the result in case it has any
2759 SAVE_EXPRs in it that need to be evaluated here. */
2760 if (!Is_Renaming_Of_Object (gnat_temp
)
2761 && ! (type_annotate_only
2762 && (Is_Array_Type (Etype (gnat_temp
))
2763 || Is_Record_Type (Etype (gnat_temp
))
2764 || Is_Concurrent_Type (Etype (gnat_temp
)))))
2766 = gnat_to_gnu_entity (gnat_temp
,
2767 gnat_to_gnu (Renamed_Object (gnat_temp
)), 1);
2769 gnu_result
= alloc_stmt_list ();
2772 case N_Implicit_Label_Declaration
:
2773 gnat_to_gnu_entity (Defining_Entity (gnat_node
), NULL_TREE
, 1);
2774 gnu_result
= alloc_stmt_list ();
2777 case N_Exception_Renaming_Declaration
:
2778 case N_Number_Declaration
:
2779 case N_Package_Renaming_Declaration
:
2780 case N_Subprogram_Renaming_Declaration
:
2781 /* These are fully handled in the front end. */
2782 gnu_result
= alloc_stmt_list ();
2785 /*************************************/
2786 /* Chapter 4: Names and Expressions: */
2787 /*************************************/
2789 case N_Explicit_Dereference
:
2790 gnu_result
= gnat_to_gnu (Prefix (gnat_node
));
2791 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
2792 gnu_result
= build_unary_op (INDIRECT_REF
, NULL_TREE
, gnu_result
);
2795 case N_Indexed_Component
:
2797 tree gnu_array_object
= gnat_to_gnu (Prefix (gnat_node
));
2801 Node_Id
*gnat_expr_array
;
2803 gnu_array_object
= maybe_implicit_deref (gnu_array_object
);
2804 gnu_array_object
= maybe_unconstrained_array (gnu_array_object
);
2806 /* If we got a padded type, remove it too. */
2807 if (TREE_CODE (TREE_TYPE (gnu_array_object
)) == RECORD_TYPE
2808 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_array_object
)))
2810 = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_array_object
))),
2813 gnu_result
= gnu_array_object
;
2815 /* First compute the number of dimensions of the array, then
2816 fill the expression array, the order depending on whether
2817 this is a Convention_Fortran array or not. */
2818 for (ndim
= 1, gnu_type
= TREE_TYPE (gnu_array_object
);
2819 TREE_CODE (TREE_TYPE (gnu_type
)) == ARRAY_TYPE
2820 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type
));
2821 ndim
++, gnu_type
= TREE_TYPE (gnu_type
))
2824 gnat_expr_array
= (Node_Id
*) alloca (ndim
* sizeof (Node_Id
));
2826 if (TYPE_CONVENTION_FORTRAN_P (TREE_TYPE (gnu_array_object
)))
2827 for (i
= ndim
- 1, gnat_temp
= First (Expressions (gnat_node
));
2829 i
--, gnat_temp
= Next (gnat_temp
))
2830 gnat_expr_array
[i
] = gnat_temp
;
2832 for (i
= 0, gnat_temp
= First (Expressions (gnat_node
));
2834 i
++, gnat_temp
= Next (gnat_temp
))
2835 gnat_expr_array
[i
] = gnat_temp
;
2837 for (i
= 0, gnu_type
= TREE_TYPE (gnu_array_object
);
2838 i
< ndim
; i
++, gnu_type
= TREE_TYPE (gnu_type
))
2840 gcc_assert (TREE_CODE (gnu_type
) == ARRAY_TYPE
);
2841 gnat_temp
= gnat_expr_array
[i
];
2842 gnu_expr
= gnat_to_gnu (gnat_temp
);
2844 if (Do_Range_Check (gnat_temp
))
2847 (gnu_array_object
, gnu_expr
,
2848 TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type
))),
2849 TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type
))));
2851 gnu_result
= build_binary_op (ARRAY_REF
, NULL_TREE
,
2852 gnu_result
, gnu_expr
);
2856 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
2862 Node_Id gnat_range_node
= Discrete_Range (gnat_node
);
2864 gnu_result
= gnat_to_gnu (Prefix (gnat_node
));
2865 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
2867 /* Do any implicit dereferences of the prefix and do any needed
2869 gnu_result
= maybe_implicit_deref (gnu_result
);
2870 gnu_result
= maybe_unconstrained_array (gnu_result
);
2871 gnu_type
= TREE_TYPE (gnu_result
);
2872 if (Do_Range_Check (gnat_range_node
))
2874 /* Get the bounds of the slice. */
2876 = TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_result_type
));
2877 tree gnu_min_expr
= TYPE_MIN_VALUE (gnu_index_type
);
2878 tree gnu_max_expr
= TYPE_MAX_VALUE (gnu_index_type
);
2879 tree gnu_expr_l
, gnu_expr_h
, gnu_expr_type
;
2881 /* Check to see that the minimum slice value is in range */
2884 (gnu_result
, gnu_min_expr
,
2885 TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type
))),
2886 TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type
))));
2888 /* Check to see that the maximum slice value is in range */
2891 (gnu_result
, gnu_max_expr
,
2892 TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type
))),
2893 TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type
))));
2895 /* Derive a good type to convert everything too */
2896 gnu_expr_type
= get_base_type (TREE_TYPE (gnu_expr_l
));
2898 /* Build a compound expression that does the range checks */
2900 = build_binary_op (COMPOUND_EXPR
, gnu_expr_type
,
2901 convert (gnu_expr_type
, gnu_expr_h
),
2902 convert (gnu_expr_type
, gnu_expr_l
));
2904 /* Build a conditional expression that returns the range checks
2905 expression if the slice range is not null (max >= min) or
2906 returns the min if the slice range is null */
2908 = fold (build3 (COND_EXPR
, gnu_expr_type
,
2909 build_binary_op (GE_EXPR
, gnu_expr_type
,
2910 convert (gnu_expr_type
,
2912 convert (gnu_expr_type
,
2914 gnu_expr
, gnu_min_expr
));
2917 gnu_expr
= TYPE_MIN_VALUE (TYPE_DOMAIN (gnu_result_type
));
2919 gnu_result
= build_binary_op (ARRAY_RANGE_REF
, gnu_result_type
,
2920 gnu_result
, gnu_expr
);
2924 case N_Selected_Component
:
2926 tree gnu_prefix
= gnat_to_gnu (Prefix (gnat_node
));
2927 Entity_Id gnat_field
= Entity (Selector_Name (gnat_node
));
2928 Entity_Id gnat_pref_type
= Etype (Prefix (gnat_node
));
2931 while (IN (Ekind (gnat_pref_type
), Incomplete_Or_Private_Kind
)
2932 || IN (Ekind (gnat_pref_type
), Access_Kind
))
2934 if (IN (Ekind (gnat_pref_type
), Incomplete_Or_Private_Kind
))
2935 gnat_pref_type
= Underlying_Type (gnat_pref_type
);
2936 else if (IN (Ekind (gnat_pref_type
), Access_Kind
))
2937 gnat_pref_type
= Designated_Type (gnat_pref_type
);
2940 gnu_prefix
= maybe_implicit_deref (gnu_prefix
);
2942 /* For discriminant references in tagged types always substitute the
2943 corresponding discriminant as the actual selected component. */
2945 if (Is_Tagged_Type (gnat_pref_type
))
2946 while (Present (Corresponding_Discriminant (gnat_field
)))
2947 gnat_field
= Corresponding_Discriminant (gnat_field
);
2949 /* For discriminant references of untagged types always substitute the
2950 corresponding stored discriminant. */
2952 else if (Present (Corresponding_Discriminant (gnat_field
)))
2953 gnat_field
= Original_Record_Component (gnat_field
);
2955 /* Handle extracting the real or imaginary part of a complex.
2956 The real part is the first field and the imaginary the last. */
2958 if (TREE_CODE (TREE_TYPE (gnu_prefix
)) == COMPLEX_TYPE
)
2959 gnu_result
= build_unary_op (Present (Next_Entity (gnat_field
))
2960 ? REALPART_EXPR
: IMAGPART_EXPR
,
2961 NULL_TREE
, gnu_prefix
);
2964 gnu_field
= gnat_to_gnu_entity (gnat_field
, NULL_TREE
, 0);
2966 /* If there are discriminants, the prefix might be
2967 evaluated more than once, which is a problem if it has
2969 if (Has_Discriminants (Is_Access_Type (Etype (Prefix (gnat_node
)))
2970 ? Designated_Type (Etype
2971 (Prefix (gnat_node
)))
2972 : Etype (Prefix (gnat_node
))))
2973 gnu_prefix
= gnat_stabilize_reference (gnu_prefix
, 0);
2976 = build_component_ref (gnu_prefix
, NULL_TREE
, gnu_field
,
2977 (Nkind (Parent (gnat_node
))
2978 == N_Attribute_Reference
));
2981 gcc_assert (gnu_result
);
2982 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
2986 case N_Attribute_Reference
:
2988 /* The attribute designator (like an enumeration value). */
2989 int attribute
= Get_Attribute_Id (Attribute_Name (gnat_node
));
2991 /* The Elab_Spec and Elab_Body attributes are special in that
2992 Prefix is a unit, not an object with a GCC equivalent. Similarly
2993 for Elaborated, since that variable isn't otherwise known. */
2994 if (attribute
== Attr_Elab_Body
|| attribute
== Attr_Elab_Spec
)
2995 return (create_subprog_decl
2996 (create_concat_name (Entity (Prefix (gnat_node
)),
2997 attribute
== Attr_Elab_Body
2998 ? "elabb" : "elabs"),
2999 NULL_TREE
, void_ftype
, NULL_TREE
, false, true, true, NULL
,
3002 gnu_result
= Attribute_to_gnu (gnat_node
, &gnu_result_type
, attribute
);
3007 /* Like 'Access as far as we are concerned. */
3008 gnu_result
= gnat_to_gnu (Prefix (gnat_node
));
3009 gnu_result
= build_unary_op (ADDR_EXPR
, NULL_TREE
, gnu_result
);
3010 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
3014 case N_Extension_Aggregate
:
3018 /* ??? It is wrong to evaluate the type now, but there doesn't
3019 seem to be any other practical way of doing it. */
3021 gnu_aggr_type
= gnu_result_type
3022 = get_unpadded_type (Etype (gnat_node
));
3024 if (TREE_CODE (gnu_result_type
) == RECORD_TYPE
3025 && TYPE_CONTAINS_TEMPLATE_P (gnu_result_type
))
3027 = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_result_type
)));
3029 if (Null_Record_Present (gnat_node
))
3030 gnu_result
= gnat_build_constructor (gnu_aggr_type
, NULL_TREE
);
3032 else if (TREE_CODE (gnu_aggr_type
) == RECORD_TYPE
)
3034 = assoc_to_constructor (First (Component_Associations (gnat_node
)),
3036 else if (TREE_CODE (gnu_aggr_type
) == UNION_TYPE
)
3038 /* The first element is the discrimant, which we ignore. The
3039 next is the field we're building. Convert the expression
3040 to the type of the field and then to the union type. */
3042 = Next (First (Component_Associations (gnat_node
)));
3043 Entity_Id gnat_field
= Entity (First (Choices (gnat_assoc
)));
3045 = TREE_TYPE (gnat_to_gnu_entity (gnat_field
, NULL_TREE
, 0));
3047 gnu_result
= convert (gnu_field_type
,
3048 gnat_to_gnu (Expression (gnat_assoc
)));
3050 else if (TREE_CODE (gnu_aggr_type
) == ARRAY_TYPE
)
3051 gnu_result
= pos_to_constructor (First (Expressions (gnat_node
)),
3053 Component_Type (Etype (gnat_node
)));
3054 else if (TREE_CODE (gnu_aggr_type
) == COMPLEX_TYPE
)
3057 (COMPLEX_EXPR
, gnu_aggr_type
,
3058 gnat_to_gnu (Expression (First
3059 (Component_Associations (gnat_node
)))),
3060 gnat_to_gnu (Expression
3062 (First (Component_Associations (gnat_node
))))));
3066 gnu_result
= convert (gnu_result_type
, gnu_result
);
3071 gnu_result
= null_pointer_node
;
3072 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
3075 case N_Type_Conversion
:
3076 case N_Qualified_Expression
:
3077 /* Get the operand expression. */
3078 gnu_result
= gnat_to_gnu (Expression (gnat_node
));
3079 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
3082 = convert_with_check (Etype (gnat_node
), gnu_result
,
3083 Do_Overflow_Check (gnat_node
),
3084 Do_Range_Check (Expression (gnat_node
)),
3085 Nkind (gnat_node
) == N_Type_Conversion
3086 && Float_Truncate (gnat_node
));
3089 case N_Unchecked_Type_Conversion
:
3090 gnu_result
= gnat_to_gnu (Expression (gnat_node
));
3091 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
3093 /* If the result is a pointer type, see if we are improperly
3094 converting to a stricter alignment. */
3096 if (STRICT_ALIGNMENT
&& POINTER_TYPE_P (gnu_result_type
)
3097 && IN (Ekind (Etype (gnat_node
)), Access_Kind
))
3099 unsigned int align
= known_alignment (gnu_result
);
3100 tree gnu_obj_type
= TREE_TYPE (gnu_result_type
);
3101 unsigned int oalign
= TYPE_ALIGN (gnu_obj_type
);
3103 if (align
!= 0 && align
< oalign
&& !TYPE_ALIGN_OK (gnu_obj_type
))
3104 post_error_ne_tree_2
3105 ("?source alignment (^) < alignment of & (^)",
3106 gnat_node
, Designated_Type (Etype (gnat_node
)),
3107 size_int (align
/ BITS_PER_UNIT
), oalign
/ BITS_PER_UNIT
);
3110 gnu_result
= unchecked_convert (gnu_result_type
, gnu_result
,
3111 No_Truncation (gnat_node
));
3117 tree gnu_object
= gnat_to_gnu (Left_Opnd (gnat_node
));
3118 Node_Id gnat_range
= Right_Opnd (gnat_node
);
3122 /* GNAT_RANGE is either an N_Range node or an identifier
3123 denoting a subtype. */
3124 if (Nkind (gnat_range
) == N_Range
)
3126 gnu_low
= gnat_to_gnu (Low_Bound (gnat_range
));
3127 gnu_high
= gnat_to_gnu (High_Bound (gnat_range
));
3129 else if (Nkind (gnat_range
) == N_Identifier
3130 || Nkind (gnat_range
) == N_Expanded_Name
)
3132 tree gnu_range_type
= get_unpadded_type (Entity (gnat_range
));
3134 gnu_low
= TYPE_MIN_VALUE (gnu_range_type
);
3135 gnu_high
= TYPE_MAX_VALUE (gnu_range_type
);
3140 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
3142 /* If LOW and HIGH are identical, perform an equality test.
3143 Otherwise, ensure that GNU_OBJECT is only evaluated once
3144 and perform a full range test. */
3145 if (operand_equal_p (gnu_low
, gnu_high
, 0))
3146 gnu_result
= build_binary_op (EQ_EXPR
, gnu_result_type
,
3147 gnu_object
, gnu_low
);
3150 gnu_object
= protect_multiple_eval (gnu_object
);
3152 = build_binary_op (TRUTH_ANDIF_EXPR
, gnu_result_type
,
3153 build_binary_op (GE_EXPR
, gnu_result_type
,
3154 gnu_object
, gnu_low
),
3155 build_binary_op (LE_EXPR
, gnu_result_type
,
3156 gnu_object
, gnu_high
));
3159 if (Nkind (gnat_node
) == N_Not_In
)
3160 gnu_result
= invert_truthvalue (gnu_result
);
3165 gnu_lhs
= gnat_to_gnu (Left_Opnd (gnat_node
));
3166 gnu_rhs
= gnat_to_gnu (Right_Opnd (gnat_node
));
3167 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
3168 gnu_result
= build_binary_op (FLOAT_TYPE_P (gnu_result_type
)
3170 : (Rounded_Result (gnat_node
)
3171 ? ROUND_DIV_EXPR
: TRUNC_DIV_EXPR
),
3172 gnu_result_type
, gnu_lhs
, gnu_rhs
);
3175 case N_Op_Or
: case N_Op_And
: case N_Op_Xor
:
3176 /* These can either be operations on booleans or on modular types.
3177 Fall through for boolean types since that's the way GNU_CODES is
3179 if (IN (Ekind (Underlying_Type (Etype (gnat_node
))),
3180 Modular_Integer_Kind
))
3183 = (Nkind (gnat_node
) == N_Op_Or
? BIT_IOR_EXPR
3184 : Nkind (gnat_node
) == N_Op_And
? BIT_AND_EXPR
3187 gnu_lhs
= gnat_to_gnu (Left_Opnd (gnat_node
));
3188 gnu_rhs
= gnat_to_gnu (Right_Opnd (gnat_node
));
3189 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
3190 gnu_result
= build_binary_op (code
, gnu_result_type
,
3195 /* ... fall through ... */
3197 case N_Op_Eq
: case N_Op_Ne
: case N_Op_Lt
:
3198 case N_Op_Le
: case N_Op_Gt
: case N_Op_Ge
:
3199 case N_Op_Add
: case N_Op_Subtract
: case N_Op_Multiply
:
3200 case N_Op_Mod
: case N_Op_Rem
:
3201 case N_Op_Rotate_Left
:
3202 case N_Op_Rotate_Right
:
3203 case N_Op_Shift_Left
:
3204 case N_Op_Shift_Right
:
3205 case N_Op_Shift_Right_Arithmetic
:
3206 case N_And_Then
: case N_Or_Else
:
3208 enum tree_code code
= gnu_codes
[Nkind (gnat_node
)];
3211 gnu_lhs
= gnat_to_gnu (Left_Opnd (gnat_node
));
3212 gnu_rhs
= gnat_to_gnu (Right_Opnd (gnat_node
));
3213 gnu_type
= gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
3215 /* If this is a comparison operator, convert any references to
3216 an unconstrained array value into a reference to the
3218 if (TREE_CODE_CLASS (code
) == tcc_comparison
)
3220 gnu_lhs
= maybe_unconstrained_array (gnu_lhs
);
3221 gnu_rhs
= maybe_unconstrained_array (gnu_rhs
);
3224 /* If the result type is a private type, its full view may be a
3225 numeric subtype. The representation we need is that of its base
3226 type, given that it is the result of an arithmetic operation. */
3227 else if (Is_Private_Type (Etype (gnat_node
)))
3228 gnu_type
= gnu_result_type
3229 = get_unpadded_type (Base_Type (Full_View (Etype (gnat_node
))));
3231 /* If this is a shift whose count is not guaranteed to be correct,
3232 we need to adjust the shift count. */
3233 if (IN (Nkind (gnat_node
), N_Op_Shift
)
3234 && !Shift_Count_OK (gnat_node
))
3236 tree gnu_count_type
= get_base_type (TREE_TYPE (gnu_rhs
));
3238 = convert (gnu_count_type
, TYPE_SIZE (gnu_type
));
3240 if (Nkind (gnat_node
) == N_Op_Rotate_Left
3241 || Nkind (gnat_node
) == N_Op_Rotate_Right
)
3242 gnu_rhs
= build_binary_op (TRUNC_MOD_EXPR
, gnu_count_type
,
3243 gnu_rhs
, gnu_max_shift
);
3244 else if (Nkind (gnat_node
) == N_Op_Shift_Right_Arithmetic
)
3247 (MIN_EXPR
, gnu_count_type
,
3248 build_binary_op (MINUS_EXPR
,
3251 convert (gnu_count_type
,
3256 /* For right shifts, the type says what kind of shift to do,
3257 so we may need to choose a different type. */
3258 if (Nkind (gnat_node
) == N_Op_Shift_Right
3259 && !TYPE_UNSIGNED (gnu_type
))
3260 gnu_type
= gnat_unsigned_type (gnu_type
);
3261 else if (Nkind (gnat_node
) == N_Op_Shift_Right_Arithmetic
3262 && TYPE_UNSIGNED (gnu_type
))
3263 gnu_type
= gnat_signed_type (gnu_type
);
3265 if (gnu_type
!= gnu_result_type
)
3267 gnu_lhs
= convert (gnu_type
, gnu_lhs
);
3268 gnu_rhs
= convert (gnu_type
, gnu_rhs
);
3271 gnu_result
= build_binary_op (code
, gnu_type
, gnu_lhs
, gnu_rhs
);
3273 /* If this is a logical shift with the shift count not verified,
3274 we must return zero if it is too large. We cannot compensate
3275 above in this case. */
3276 if ((Nkind (gnat_node
) == N_Op_Shift_Left
3277 || Nkind (gnat_node
) == N_Op_Shift_Right
)
3278 && !Shift_Count_OK (gnat_node
))
3282 build_binary_op (GE_EXPR
, integer_type_node
,
3284 convert (TREE_TYPE (gnu_rhs
),
3285 TYPE_SIZE (gnu_type
))),
3286 convert (gnu_type
, integer_zero_node
),
3291 case N_Conditional_Expression
:
3293 tree gnu_cond
= gnat_to_gnu (First (Expressions (gnat_node
)));
3294 tree gnu_true
= gnat_to_gnu (Next (First (Expressions (gnat_node
))));
3296 = gnat_to_gnu (Next (Next (First (Expressions (gnat_node
)))));
3298 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
3299 gnu_result
= build_cond_expr (gnu_result_type
,
3300 gnat_truthvalue_conversion (gnu_cond
),
3301 gnu_true
, gnu_false
);
3306 gnu_result
= gnat_to_gnu (Right_Opnd (gnat_node
));
3307 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
3311 /* This case can apply to a boolean or a modular type.
3312 Fall through for a boolean operand since GNU_CODES is set
3313 up to handle this. */
3314 if (IN (Ekind (Etype (gnat_node
)), Modular_Integer_Kind
))
3316 gnu_expr
= gnat_to_gnu (Right_Opnd (gnat_node
));
3317 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
3318 gnu_result
= build_unary_op (BIT_NOT_EXPR
, gnu_result_type
,
3323 /* ... fall through ... */
3325 case N_Op_Minus
: case N_Op_Abs
:
3326 gnu_expr
= gnat_to_gnu (Right_Opnd (gnat_node
));
3328 if (Ekind (Etype (gnat_node
)) != E_Private_Type
)
3329 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
3331 gnu_result_type
= get_unpadded_type (Base_Type
3332 (Full_View (Etype (gnat_node
))));
3334 gnu_result
= build_unary_op (gnu_codes
[Nkind (gnat_node
)],
3335 gnu_result_type
, gnu_expr
);
3343 gnat_temp
= Expression (gnat_node
);
3345 /* The Expression operand can either be an N_Identifier or
3346 Expanded_Name, which must represent a type, or a
3347 N_Qualified_Expression, which contains both the object type and an
3348 initial value for the object. */
3349 if (Nkind (gnat_temp
) == N_Identifier
3350 || Nkind (gnat_temp
) == N_Expanded_Name
)
3351 gnu_type
= gnat_to_gnu_type (Entity (gnat_temp
));
3352 else if (Nkind (gnat_temp
) == N_Qualified_Expression
)
3354 Entity_Id gnat_desig_type
3355 = Designated_Type (Underlying_Type (Etype (gnat_node
)));
3357 gnu_init
= gnat_to_gnu (Expression (gnat_temp
));
3359 gnu_init
= maybe_unconstrained_array (gnu_init
);
3360 if (Do_Range_Check (Expression (gnat_temp
)))
3361 gnu_init
= emit_range_check (gnu_init
, gnat_desig_type
);
3363 if (Is_Elementary_Type (gnat_desig_type
)
3364 || Is_Constrained (gnat_desig_type
))
3366 gnu_type
= gnat_to_gnu_type (gnat_desig_type
);
3367 gnu_init
= convert (gnu_type
, gnu_init
);
3371 gnu_type
= gnat_to_gnu_type (Etype (Expression (gnat_temp
)));
3372 if (TREE_CODE (gnu_type
) == UNCONSTRAINED_ARRAY_TYPE
)
3373 gnu_type
= TREE_TYPE (gnu_init
);
3375 gnu_init
= convert (gnu_type
, gnu_init
);
3381 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
3382 return build_allocator (gnu_type
, gnu_init
, gnu_result_type
,
3383 Procedure_To_Call (gnat_node
),
3384 Storage_Pool (gnat_node
), gnat_node
);
3388 /***************************/
3389 /* Chapter 5: Statements: */
3390 /***************************/
3393 gnu_result
= build1 (LABEL_EXPR
, void_type_node
,
3394 gnat_to_gnu (Identifier (gnat_node
)));
3397 case N_Null_Statement
:
3398 gnu_result
= alloc_stmt_list ();
3401 case N_Assignment_Statement
:
3402 /* Get the LHS and RHS of the statement and convert any reference to an
3403 unconstrained array into a reference to the underlying array.
3404 If we are not to do range checking and the RHS is an N_Function_Call,
3405 pass the LHS to the call function. */
3406 gnu_lhs
= maybe_unconstrained_array (gnat_to_gnu (Name (gnat_node
)));
3408 /* If the type has a size that overflows, convert this into raise of
3409 Storage_Error: execution shouldn't have gotten here anyway. */
3410 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (gnu_lhs
))) == INTEGER_CST
3411 && TREE_OVERFLOW (TYPE_SIZE (TREE_TYPE (gnu_lhs
))))
3412 gnu_result
= build_call_raise (SE_Object_Too_Large
);
3413 else if (Nkind (Expression (gnat_node
)) == N_Function_Call
3414 && !Do_Range_Check (Expression (gnat_node
)))
3415 gnu_result
= call_to_gnu (Expression (gnat_node
),
3416 &gnu_result_type
, gnu_lhs
);
3420 = maybe_unconstrained_array (gnat_to_gnu (Expression (gnat_node
)));
3422 /* If range check is needed, emit code to generate it */
3423 if (Do_Range_Check (Expression (gnat_node
)))
3424 gnu_rhs
= emit_range_check (gnu_rhs
, Etype (Name (gnat_node
)));
3427 = build_binary_op (MODIFY_EXPR
, NULL_TREE
, gnu_lhs
, gnu_rhs
);
3431 case N_If_Statement
:
3433 tree
*gnu_else_ptr
; /* Point to put next "else if" or "else". */
3435 /* Make the outer COND_EXPR. Avoid non-determinism. */
3436 gnu_result
= build3 (COND_EXPR
, void_type_node
,
3437 gnat_to_gnu (Condition (gnat_node
)),
3438 NULL_TREE
, NULL_TREE
);
3439 COND_EXPR_THEN (gnu_result
)
3440 = build_stmt_group (Then_Statements (gnat_node
), false);
3441 TREE_SIDE_EFFECTS (gnu_result
) = 1;
3442 gnu_else_ptr
= &COND_EXPR_ELSE (gnu_result
);
3444 /* Now make a COND_EXPR for each of the "else if" parts. Put each
3445 into the previous "else" part and point to where to put any
3446 outer "else". Also avoid non-determinism. */
3447 if (Present (Elsif_Parts (gnat_node
)))
3448 for (gnat_temp
= First (Elsif_Parts (gnat_node
));
3449 Present (gnat_temp
); gnat_temp
= Next (gnat_temp
))
3451 gnu_expr
= build3 (COND_EXPR
, void_type_node
,
3452 gnat_to_gnu (Condition (gnat_temp
)),
3453 NULL_TREE
, NULL_TREE
);
3454 COND_EXPR_THEN (gnu_expr
)
3455 = build_stmt_group (Then_Statements (gnat_temp
), false);
3456 TREE_SIDE_EFFECTS (gnu_expr
) = 1;
3457 annotate_with_node (gnu_expr
, gnat_temp
);
3458 *gnu_else_ptr
= gnu_expr
;
3459 gnu_else_ptr
= &COND_EXPR_ELSE (gnu_expr
);
3462 *gnu_else_ptr
= build_stmt_group (Else_Statements (gnat_node
), false);
3466 case N_Case_Statement
:
3467 gnu_result
= Case_Statement_to_gnu (gnat_node
);
3470 case N_Loop_Statement
:
3471 gnu_result
= Loop_Statement_to_gnu (gnat_node
);
3474 case N_Block_Statement
:
3475 start_stmt_group ();
3477 process_decls (Declarations (gnat_node
), Empty
, Empty
, true, true);
3478 add_stmt (gnat_to_gnu (Handled_Statement_Sequence (gnat_node
)));
3480 gnu_result
= end_stmt_group ();
3482 if (Present (Identifier (gnat_node
)))
3483 mark_out_of_scope (Entity (Identifier (gnat_node
)));
3486 case N_Exit_Statement
:
3488 = build2 (EXIT_STMT
, void_type_node
,
3489 (Present (Condition (gnat_node
))
3490 ? gnat_to_gnu (Condition (gnat_node
)) : NULL_TREE
),
3491 (Present (Name (gnat_node
))
3492 ? get_gnu_tree (Entity (Name (gnat_node
)))
3493 : TREE_VALUE (gnu_loop_label_stack
)));
3496 case N_Return_Statement
:
3498 /* The gnu function type of the subprogram currently processed. */
3499 tree gnu_subprog_type
= TREE_TYPE (current_function_decl
);
3500 /* The return value from the subprogram. */
3501 tree gnu_ret_val
= NULL_TREE
;
3502 /* The place to put the return value. */
3504 = (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type
)
3505 ? build_unary_op (INDIRECT_REF
, NULL_TREE
,
3506 DECL_ARGUMENTS (current_function_decl
))
3507 : DECL_RESULT (current_function_decl
));
3509 /* If we are dealing with a "return;" from an Ada procedure with
3510 parameters passed by copy in copy out, we need to return a record
3511 containing the final values of these parameters. If the list
3512 contains only one entry, return just that entry.
3514 For a full description of the copy in copy out parameter mechanism,
3515 see the part of the gnat_to_gnu_entity routine dealing with the
3516 translation of subprograms.
3518 But if we have a return label defined, convert this into
3519 a branch to that label. */
3521 if (TREE_VALUE (gnu_return_label_stack
))
3523 gnu_result
= build1 (GOTO_EXPR
, void_type_node
,
3524 TREE_VALUE (gnu_return_label_stack
));
3528 else if (TYPE_CI_CO_LIST (gnu_subprog_type
))
3530 if (list_length (TYPE_CI_CO_LIST (gnu_subprog_type
)) == 1)
3531 gnu_ret_val
= TREE_VALUE (TYPE_CI_CO_LIST (gnu_subprog_type
));
3534 = gnat_build_constructor (TREE_TYPE (gnu_subprog_type
),
3535 TYPE_CI_CO_LIST (gnu_subprog_type
));
3538 /* If the Ada subprogram is a function, we just need to return the
3539 expression. If the subprogram returns an unconstrained
3540 array, we have to allocate a new version of the result and
3541 return it. If we return by reference, return a pointer. */
3543 else if (Present (Expression (gnat_node
)))
3545 /* If the current function returns by target pointer and we
3546 are doing a call, pass that target to the call. */
3547 if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type
)
3548 && Nkind (Expression (gnat_node
)) == N_Function_Call
)
3549 gnu_result
= call_to_gnu (Expression (gnat_node
),
3550 &gnu_result_type
, gnu_lhs
);
3554 gnu_ret_val
= gnat_to_gnu (Expression (gnat_node
));
3556 /* Do not remove the padding from GNU_RET_VAL if the inner
3557 type is self-referential since we want to allocate the fixed
3558 size in that case. */
3559 if (TREE_CODE (gnu_ret_val
) == COMPONENT_REF
3560 && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_ret_val
, 0)))
3562 && (TYPE_IS_PADDING_P
3563 (TREE_TYPE (TREE_OPERAND (gnu_ret_val
, 0))))
3564 && (CONTAINS_PLACEHOLDER_P
3565 (TYPE_SIZE (TREE_TYPE (gnu_ret_val
)))))
3566 gnu_ret_val
= TREE_OPERAND (gnu_ret_val
, 0);
3568 if (TYPE_RETURNS_BY_REF_P (gnu_subprog_type
)
3569 || By_Ref (gnat_node
))
3571 = build_unary_op (ADDR_EXPR
, NULL_TREE
, gnu_ret_val
);
3573 else if (TYPE_RETURNS_UNCONSTRAINED_P (gnu_subprog_type
))
3575 gnu_ret_val
= maybe_unconstrained_array (gnu_ret_val
);
3577 /* We have two cases: either the function returns with
3578 depressed stack or not. If not, we allocate on the
3579 secondary stack. If so, we allocate in the stack frame.
3580 if no copy is needed, the front end will set By_Ref,
3581 which we handle in the case above. */
3582 if (TYPE_RETURNS_STACK_DEPRESSED (gnu_subprog_type
))
3584 = build_allocator (TREE_TYPE (gnu_ret_val
),
3586 TREE_TYPE (gnu_subprog_type
),
3590 = build_allocator (TREE_TYPE (gnu_ret_val
),
3592 TREE_TYPE (gnu_subprog_type
),
3593 Procedure_To_Call (gnat_node
),
3594 Storage_Pool (gnat_node
),
3599 gnu_result
= build2 (MODIFY_EXPR
, TREE_TYPE (gnu_ret_val
),
3600 gnu_lhs
, gnu_ret_val
);
3601 if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type
))
3603 add_stmt_with_node (gnu_result
, gnat_node
);
3604 gnu_ret_val
= NULL_TREE
;
3608 gnu_result
= build1 (RETURN_EXPR
, void_type_node
,
3609 gnu_ret_val
? gnu_result
: gnu_ret_val
);
3613 case N_Goto_Statement
:
3614 gnu_result
= build1 (GOTO_EXPR
, void_type_node
,
3615 gnat_to_gnu (Name (gnat_node
)));
3618 /****************************/
3619 /* Chapter 6: Subprograms: */
3620 /****************************/
3622 case N_Subprogram_Declaration
:
3623 /* Unless there is a freeze node, declare the subprogram. We consider
3624 this a "definition" even though we're not generating code for
3625 the subprogram because we will be making the corresponding GCC
3628 if (No (Freeze_Node (Defining_Entity (Specification (gnat_node
)))))
3629 gnat_to_gnu_entity (Defining_Entity (Specification (gnat_node
)),
3631 gnu_result
= alloc_stmt_list ();
3634 case N_Abstract_Subprogram_Declaration
:
3635 /* This subprogram doesn't exist for code generation purposes, but we
3636 have to elaborate the types of any parameters, unless they are
3637 imported types (nothing to generate in this case). */
3639 = First_Formal (Defining_Entity (Specification (gnat_node
)));
3640 Present (gnat_temp
);
3641 gnat_temp
= Next_Formal_With_Extras (gnat_temp
))
3642 if (Is_Itype (Etype (gnat_temp
))
3643 && !From_With_Type (Etype (gnat_temp
)))
3644 gnat_to_gnu_entity (Etype (gnat_temp
), NULL_TREE
, 0);
3646 gnu_result
= alloc_stmt_list ();
3649 case N_Defining_Program_Unit_Name
:
3650 /* For a child unit identifier go up a level to get the
3651 specificaton. We get this when we try to find the spec of
3652 a child unit package that is the compilation unit being compiled. */
3653 gnu_result
= gnat_to_gnu (Parent (gnat_node
));
3656 case N_Subprogram_Body
:
3657 Subprogram_Body_to_gnu (gnat_node
);
3658 gnu_result
= alloc_stmt_list ();
3661 case N_Function_Call
:
3662 case N_Procedure_Call_Statement
:
3663 gnu_result
= call_to_gnu (gnat_node
, &gnu_result_type
, NULL_TREE
);
3666 /*************************/
3667 /* Chapter 7: Packages: */
3668 /*************************/
3670 case N_Package_Declaration
:
3671 gnu_result
= gnat_to_gnu (Specification (gnat_node
));
3674 case N_Package_Specification
:
3676 start_stmt_group ();
3677 process_decls (Visible_Declarations (gnat_node
),
3678 Private_Declarations (gnat_node
), Empty
, true, true);
3679 gnu_result
= end_stmt_group ();
3682 case N_Package_Body
:
3684 /* If this is the body of a generic package - do nothing */
3685 if (Ekind (Corresponding_Spec (gnat_node
)) == E_Generic_Package
)
3687 gnu_result
= alloc_stmt_list ();
3691 start_stmt_group ();
3692 process_decls (Declarations (gnat_node
), Empty
, Empty
, true, true);
3694 if (Present (Handled_Statement_Sequence (gnat_node
)))
3695 add_stmt (gnat_to_gnu (Handled_Statement_Sequence (gnat_node
)));
3697 gnu_result
= end_stmt_group ();
3700 /*********************************/
3701 /* Chapter 8: Visibility Rules: */
3702 /*********************************/
3704 case N_Use_Package_Clause
:
3705 case N_Use_Type_Clause
:
3706 /* Nothing to do here - but these may appear in list of declarations */
3707 gnu_result
= alloc_stmt_list ();
3710 /***********************/
3711 /* Chapter 9: Tasks: */
3712 /***********************/
3714 case N_Protected_Type_Declaration
:
3715 gnu_result
= alloc_stmt_list ();
3718 case N_Single_Task_Declaration
:
3719 gnat_to_gnu_entity (Defining_Entity (gnat_node
), NULL_TREE
, 1);
3720 gnu_result
= alloc_stmt_list ();
3723 /***********************************************************/
3724 /* Chapter 10: Program Structure and Compilation Issues: */
3725 /***********************************************************/
3727 case N_Compilation_Unit
:
3729 /* This is not called for the main unit, which is handled in function
3731 start_stmt_group ();
3734 Compilation_Unit_to_gnu (gnat_node
);
3735 gnu_result
= alloc_stmt_list ();
3738 case N_Subprogram_Body_Stub
:
3739 case N_Package_Body_Stub
:
3740 case N_Protected_Body_Stub
:
3741 case N_Task_Body_Stub
:
3742 /* Simply process whatever unit is being inserted. */
3743 gnu_result
= gnat_to_gnu (Unit (Library_Unit (gnat_node
)));
3747 gnu_result
= gnat_to_gnu (Proper_Body (gnat_node
));
3750 /***************************/
3751 /* Chapter 11: Exceptions: */
3752 /***************************/
3754 case N_Handled_Sequence_Of_Statements
:
3755 /* If there is an At_End procedure attached to this node, and the EH
3756 mechanism is SJLJ, we must have at least a corresponding At_End
3757 handler, unless the No_Exception_Handlers restriction is set. */
3758 gcc_assert (type_annotate_only
3759 || Exception_Mechanism
!= Setjmp_Longjmp
3760 || No (At_End_Proc (gnat_node
))
3761 || Present (Exception_Handlers (gnat_node
))
3762 || No_Exception_Handlers_Set ());
3764 gnu_result
= Handled_Sequence_Of_Statements_to_gnu (gnat_node
);
3767 case N_Exception_Handler
:
3768 if (Exception_Mechanism
== Setjmp_Longjmp
)
3769 gnu_result
= Exception_Handler_to_gnu_sjlj (gnat_node
);
3770 else if (Exception_Mechanism
== GCC_ZCX
)
3771 gnu_result
= Exception_Handler_to_gnu_zcx (gnat_node
);
3777 /*******************************/
3778 /* Chapter 12: Generic Units: */
3779 /*******************************/
3781 case N_Generic_Function_Renaming_Declaration
:
3782 case N_Generic_Package_Renaming_Declaration
:
3783 case N_Generic_Procedure_Renaming_Declaration
:
3784 case N_Generic_Package_Declaration
:
3785 case N_Generic_Subprogram_Declaration
:
3786 case N_Package_Instantiation
:
3787 case N_Procedure_Instantiation
:
3788 case N_Function_Instantiation
:
3789 /* These nodes can appear on a declaration list but there is nothing to
3790 to be done with them. */
3791 gnu_result
= alloc_stmt_list ();
3794 /***************************************************/
3795 /* Chapter 13: Representation Clauses and */
3796 /* Implementation-Dependent Features: */
3797 /***************************************************/
3799 case N_Attribute_Definition_Clause
:
3801 gnu_result
= alloc_stmt_list ();
3803 /* The only one we need deal with is for 'Address. For the others, SEM
3804 puts the information elsewhere. We need only deal with 'Address
3805 if the object has a Freeze_Node (which it never will currently). */
3806 if (Get_Attribute_Id (Chars (gnat_node
)) != Attr_Address
3807 || No (Freeze_Node (Entity (Name (gnat_node
)))))
3810 /* Get the value to use as the address and save it as the
3811 equivalent for GNAT_TEMP. When the object is frozen,
3812 gnat_to_gnu_entity will do the right thing. */
3813 save_gnu_tree (Entity (Name (gnat_node
)),
3814 gnat_to_gnu (Expression (gnat_node
)), true);
3817 case N_Enumeration_Representation_Clause
:
3818 case N_Record_Representation_Clause
:
3820 /* We do nothing with these. SEM puts the information elsewhere. */
3821 gnu_result
= alloc_stmt_list ();
3824 case N_Code_Statement
:
3825 if (!type_annotate_only
)
3827 tree gnu_template
= gnat_to_gnu (Asm_Template (gnat_node
));
3828 tree gnu_input_list
= NULL_TREE
, gnu_output_list
= NULL_TREE
;
3829 tree gnu_clobber_list
= NULL_TREE
;
3832 /* First process inputs, then outputs, then clobbers. */
3833 Setup_Asm_Inputs (gnat_node
);
3834 while (Present (gnat_temp
= Asm_Input_Value ()))
3836 tree gnu_value
= gnat_to_gnu (gnat_temp
);
3837 tree gnu_constr
= build_tree_list (NULL_TREE
, gnat_to_gnu
3838 (Asm_Input_Constraint ()));
3841 = tree_cons (gnu_constr
, gnu_value
, gnu_input_list
);
3845 Setup_Asm_Outputs (gnat_node
);
3846 while (Present (gnat_temp
= Asm_Output_Variable ()))
3848 tree gnu_value
= gnat_to_gnu (gnat_temp
);
3849 tree gnu_constr
= build_tree_list (NULL_TREE
, gnat_to_gnu
3850 (Asm_Output_Constraint ()));
3853 = tree_cons (gnu_constr
, gnu_value
, gnu_output_list
);
3857 Clobber_Setup (gnat_node
);
3858 while ((clobber
= Clobber_Get_Next ()))
3860 = tree_cons (NULL_TREE
,
3861 build_string (strlen (clobber
) + 1, clobber
),
3864 gnu_input_list
= nreverse (gnu_input_list
);
3865 gnu_output_list
= nreverse (gnu_output_list
);
3866 gnu_result
= build4 (ASM_EXPR
, void_type_node
,
3867 gnu_template
, gnu_output_list
,
3868 gnu_input_list
, gnu_clobber_list
);
3869 ASM_VOLATILE_P (gnu_result
) = Is_Asm_Volatile (gnat_node
);
3872 gnu_result
= alloc_stmt_list ();
3876 /***************************************************/
3878 /***************************************************/
3880 case N_Freeze_Entity
:
3881 start_stmt_group ();
3882 process_freeze_entity (gnat_node
);
3883 process_decls (Actions (gnat_node
), Empty
, Empty
, true, true);
3884 gnu_result
= end_stmt_group ();
3887 case N_Itype_Reference
:
3888 if (!present_gnu_tree (Itype (gnat_node
)))
3889 process_type (Itype (gnat_node
));
3891 gnu_result
= alloc_stmt_list ();
3894 case N_Free_Statement
:
3895 if (!type_annotate_only
)
3897 tree gnu_ptr
= gnat_to_gnu (Expression (gnat_node
));
3902 /* If this is a thin pointer, we must dereference it to create
3903 a fat pointer, then go back below to a thin pointer. The
3904 reason for this is that we need a fat pointer someplace in
3905 order to properly compute the size. */
3906 if (TYPE_THIN_POINTER_P (TREE_TYPE (gnu_ptr
)))
3907 gnu_ptr
= build_unary_op (ADDR_EXPR
, NULL_TREE
,
3908 build_unary_op (INDIRECT_REF
, NULL_TREE
,
3911 /* If this is an unconstrained array, we know the object must
3912 have been allocated with the template in front of the object.
3913 So pass the template address, but get the total size. Do this
3914 by converting to a thin pointer. */
3915 if (TYPE_FAT_POINTER_P (TREE_TYPE (gnu_ptr
)))
3917 = convert (build_pointer_type
3918 (TYPE_OBJECT_RECORD_TYPE
3919 (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (gnu_ptr
)))),
3922 gnu_obj_type
= TREE_TYPE (TREE_TYPE (gnu_ptr
));
3923 gnu_obj_size
= TYPE_SIZE_UNIT (gnu_obj_type
);
3924 align
= TYPE_ALIGN (gnu_obj_type
);
3926 if (TREE_CODE (gnu_obj_type
) == RECORD_TYPE
3927 && TYPE_CONTAINS_TEMPLATE_P (gnu_obj_type
))
3929 tree gnu_char_ptr_type
= build_pointer_type (char_type_node
);
3930 tree gnu_pos
= byte_position (TYPE_FIELDS (gnu_obj_type
));
3931 tree gnu_byte_offset
3932 = convert (gnu_char_ptr_type
,
3933 size_diffop (size_zero_node
, gnu_pos
));
3935 gnu_ptr
= convert (gnu_char_ptr_type
, gnu_ptr
);
3936 gnu_ptr
= build_binary_op (MINUS_EXPR
, gnu_char_ptr_type
,
3937 gnu_ptr
, gnu_byte_offset
);
3940 gnu_result
= build_call_alloc_dealloc (gnu_ptr
, gnu_obj_size
, align
,
3941 Procedure_To_Call (gnat_node
),
3942 Storage_Pool (gnat_node
),
3947 case N_Raise_Constraint_Error
:
3948 case N_Raise_Program_Error
:
3949 case N_Raise_Storage_Error
:
3950 if (type_annotate_only
)
3952 gnu_result
= alloc_stmt_list ();
3956 gnu_result_type
= get_unpadded_type (Etype (gnat_node
));
3957 gnu_result
= build_call_raise (UI_To_Int (Reason (gnat_node
)));
3959 /* If the type is VOID, this is a statement, so we need to
3960 generate the code for the call. Handle a Condition, if there
3962 if (TREE_CODE (gnu_result_type
) == VOID_TYPE
)
3964 annotate_with_node (gnu_result
, gnat_node
);
3966 if (Present (Condition (gnat_node
)))
3967 gnu_result
= build3 (COND_EXPR
, void_type_node
,
3968 gnat_to_gnu (Condition (gnat_node
)),
3969 gnu_result
, alloc_stmt_list ());
3972 gnu_result
= build1 (NULL_EXPR
, gnu_result_type
, gnu_result
);
3975 case N_Validate_Unchecked_Conversion
:
3976 /* If the result is a pointer type, see if we are either converting
3977 from a non-pointer or from a pointer to a type with a different
3978 alias set and warn if so. If the result defined in the same unit as
3979 this unchecked convertion, we can allow this because we can know to
3980 make that type have alias set 0. */
3982 tree gnu_source_type
= gnat_to_gnu_type (Source_Type (gnat_node
));
3983 tree gnu_target_type
= gnat_to_gnu_type (Target_Type (gnat_node
));
3985 if (POINTER_TYPE_P (gnu_target_type
)
3986 && !In_Same_Source_Unit (Target_Type (gnat_node
), gnat_node
)
3987 && get_alias_set (TREE_TYPE (gnu_target_type
)) != 0
3988 && !No_Strict_Aliasing (Underlying_Type (Target_Type (gnat_node
)))
3989 && (!POINTER_TYPE_P (gnu_source_type
)
3990 || (get_alias_set (TREE_TYPE (gnu_source_type
))
3991 != get_alias_set (TREE_TYPE (gnu_target_type
)))))
3994 ("?possible aliasing problem for type&",
3995 gnat_node
, Target_Type (gnat_node
));
3997 ("\\?use -fno-strict-aliasing switch for references",
4000 ("\\?or use `pragma No_Strict_Aliasing (&);`",
4001 gnat_node
, Target_Type (gnat_node
));
4004 gnu_result
= alloc_stmt_list ();
4007 case N_Raise_Statement
:
4008 case N_Function_Specification
:
4009 case N_Procedure_Specification
:
4011 case N_Component_Association
:
4014 gcc_assert (type_annotate_only
);
4015 gnu_result
= alloc_stmt_list ();
4018 /* If we pushed our level as part of processing the elaboration routine,
4020 if (went_into_elab_proc
)
4022 add_stmt (gnu_result
);
4024 gnu_result
= end_stmt_group ();
4025 current_function_decl
= NULL_TREE
;
4028 /* Set the location information into the result. If we're supposed to
4029 return something of void_type, it means we have something we're
4030 elaborating for effect, so just return. */
4031 if (EXPR_P (gnu_result
))
4032 annotate_with_node (gnu_result
, gnat_node
);
4034 if (TREE_CODE (gnu_result_type
) == VOID_TYPE
)
4037 /* If the result is a constant that overflows, raise constraint error. */
4038 else if (TREE_CODE (gnu_result
) == INTEGER_CST
4039 && TREE_CONSTANT_OVERFLOW (gnu_result
))
4041 post_error ("Constraint_Error will be raised at run-time?", gnat_node
);
4044 = build1 (NULL_EXPR
, gnu_result_type
,
4045 build_call_raise (CE_Overflow_Check_Failed
));
4048 /* If our result has side-effects and is of an unconstrained type,
4049 make a SAVE_EXPR so that we can be sure it will only be referenced
4050 once. Note we must do this before any conversions. */
4051 if (TREE_SIDE_EFFECTS (gnu_result
)
4052 && (TREE_CODE (gnu_result_type
) == UNCONSTRAINED_ARRAY_TYPE
4053 || CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_result_type
))))
4054 gnu_result
= gnat_stabilize_reference (gnu_result
, 0);
4056 /* Now convert the result to the proper type. If the type is void or if
4057 we have no result, return error_mark_node to show we have no result.
4058 If the type of the result is correct or if we have a label (which doesn't
4059 have any well-defined type), return our result. Also don't do the
4060 conversion if the "desired" type involves a PLACEHOLDER_EXPR in its size
4061 since those are the cases where the front end may have the type wrong due
4062 to "instantiating" the unconstrained record with discriminant values
4063 or if this is a FIELD_DECL. If this is the Name of an assignment
4064 statement or a parameter of a procedure call, return what we have since
4065 the RHS has to be converted to our type there in that case, unless
4066 GNU_RESULT_TYPE has a simpler size. Similarly, if the two types are
4067 record types with the same name, the expression type has integral mode,
4068 and GNU_RESULT_TYPE BLKmode, don't convert. This will be the case when
4069 we are converting from a packable type to its actual type and we need
4070 those conversions to be NOPs in order for assignments into these types to
4071 work properly if the inner object is a bitfield and hence can't have
4072 its address taken. Finally, don't convert integral types that are the
4073 operand of an unchecked conversion since we need to ignore those
4074 conversions (for 'Valid). Otherwise, convert the result to the proper
4077 if (Present (Parent (gnat_node
))
4078 && ((Nkind (Parent (gnat_node
)) == N_Assignment_Statement
4079 && Name (Parent (gnat_node
)) == gnat_node
)
4080 || (Nkind (Parent (gnat_node
)) == N_Procedure_Call_Statement
4081 && Name (Parent (gnat_node
)) != gnat_node
)
4082 || (Nkind (Parent (gnat_node
)) == N_Unchecked_Type_Conversion
4083 && !AGGREGATE_TYPE_P (gnu_result_type
)
4084 && !AGGREGATE_TYPE_P (TREE_TYPE (gnu_result
)))
4085 || Nkind (Parent (gnat_node
)) == N_Parameter_Association
)
4086 && !(TYPE_SIZE (gnu_result_type
)
4087 && TYPE_SIZE (TREE_TYPE (gnu_result
))
4088 && (AGGREGATE_TYPE_P (gnu_result_type
)
4089 == AGGREGATE_TYPE_P (TREE_TYPE (gnu_result
)))
4090 && ((TREE_CODE (TYPE_SIZE (gnu_result_type
)) == INTEGER_CST
4091 && (TREE_CODE (TYPE_SIZE (TREE_TYPE (gnu_result
)))
4093 || (TREE_CODE (TYPE_SIZE (gnu_result_type
)) != INTEGER_CST
4094 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_result_type
))
4095 && (CONTAINS_PLACEHOLDER_P
4096 (TYPE_SIZE (TREE_TYPE (gnu_result
))))))
4097 && !(TREE_CODE (gnu_result_type
) == RECORD_TYPE
4098 && TYPE_JUSTIFIED_MODULAR_P (gnu_result_type
))))
4100 /* In this case remove padding only if the inner object is of
4101 self-referential size: in that case it must be an object of
4102 unconstrained type with a default discriminant. In other cases,
4103 we want to avoid copying too much data. */
4104 if (TREE_CODE (TREE_TYPE (gnu_result
)) == RECORD_TYPE
4105 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_result
))
4106 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE
4107 (TREE_TYPE (TYPE_FIELDS
4108 (TREE_TYPE (gnu_result
))))))
4109 gnu_result
= convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_result
))),
4113 else if (TREE_CODE (gnu_result
) == LABEL_DECL
4114 || TREE_CODE (gnu_result
) == FIELD_DECL
4115 || TREE_CODE (gnu_result
) == ERROR_MARK
4116 || (TYPE_SIZE (gnu_result_type
)
4117 && TREE_CODE (TYPE_SIZE (gnu_result_type
)) != INTEGER_CST
4118 && TREE_CODE (gnu_result
) != INDIRECT_REF
4119 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_result_type
)))
4120 || ((TYPE_NAME (gnu_result_type
)
4121 == TYPE_NAME (TREE_TYPE (gnu_result
)))
4122 && TREE_CODE (gnu_result_type
) == RECORD_TYPE
4123 && TREE_CODE (TREE_TYPE (gnu_result
)) == RECORD_TYPE
4124 && TYPE_MODE (gnu_result_type
) == BLKmode
4125 && (GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (gnu_result
)))
4128 /* Remove any padding record, but do nothing more in this case. */
4129 if (TREE_CODE (TREE_TYPE (gnu_result
)) == RECORD_TYPE
4130 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_result
)))
4131 gnu_result
= convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_result
))),
4135 else if (gnu_result
== error_mark_node
4136 || gnu_result_type
== void_type_node
)
4137 gnu_result
= error_mark_node
;
4138 else if (gnu_result_type
!= TREE_TYPE (gnu_result
))
4139 gnu_result
= convert (gnu_result_type
, gnu_result
);
4141 /* We don't need any NOP_EXPR or NON_LVALUE_EXPR on GNU_RESULT. */
4142 while ((TREE_CODE (gnu_result
) == NOP_EXPR
4143 || TREE_CODE (gnu_result
) == NON_LVALUE_EXPR
)
4144 && TREE_TYPE (TREE_OPERAND (gnu_result
, 0)) == TREE_TYPE (gnu_result
))
4145 gnu_result
= TREE_OPERAND (gnu_result
, 0);
4150 /* Record the current code position in GNAT_NODE. */
4153 record_code_position (Node_Id gnat_node
)
4155 tree stmt_stmt
= build1 (STMT_STMT
, void_type_node
, NULL_TREE
);
4157 add_stmt_with_node (stmt_stmt
, gnat_node
);
4158 save_gnu_tree (gnat_node
, stmt_stmt
, true);
4161 /* Insert the code for GNAT_NODE at the position saved for that node. */
4164 insert_code_for (Node_Id gnat_node
)
4166 STMT_STMT_STMT (get_gnu_tree (gnat_node
)) = gnat_to_gnu (gnat_node
);
4167 save_gnu_tree (gnat_node
, NULL_TREE
, true);
4170 /* Start a new statement group chained to the previous group. */
4175 struct stmt_group
*group
= stmt_group_free_list
;
4177 /* First see if we can get one from the free list. */
4179 stmt_group_free_list
= group
->previous
;
4181 group
= (struct stmt_group
*) ggc_alloc (sizeof (struct stmt_group
));
4183 group
->previous
= current_stmt_group
;
4184 group
->stmt_list
= group
->block
= group
->cleanups
= NULL_TREE
;
4185 current_stmt_group
= group
;
4188 /* Add GNU_STMT to the current statement group. */
4191 add_stmt (tree gnu_stmt
)
4193 append_to_statement_list (gnu_stmt
, ¤t_stmt_group
->stmt_list
);
4195 /* If we're at top level, show everything in here is in use in case
4196 any of it is shared by a subprogram. */
4197 if (global_bindings_p ())
4198 walk_tree (&gnu_stmt
, mark_visited
, NULL
, NULL
);
4202 /* Similar, but set the location of GNU_STMT to that of GNAT_NODE. */
4205 add_stmt_with_node (tree gnu_stmt
, Node_Id gnat_node
)
4207 if (Present (gnat_node
))
4208 annotate_with_node (gnu_stmt
, gnat_node
);
4209 add_stmt (gnu_stmt
);
4212 /* Add a declaration statement for GNU_DECL to the current statement group.
4213 Get SLOC from Entity_Id. */
4216 add_decl_expr (tree gnu_decl
, Entity_Id gnat_entity
)
4220 /* If this is a variable that Gigi is to ignore, we may have been given
4221 an ERROR_MARK. So test for it. We also might have been given a
4222 reference for a renaming. So only do something for a decl. Also
4223 ignore a TYPE_DECL for an UNCONSTRAINED_ARRAY_TYPE. */
4224 if (!DECL_P (gnu_decl
)
4225 || (TREE_CODE (gnu_decl
) == TYPE_DECL
4226 && TREE_CODE (TREE_TYPE (gnu_decl
)) == UNCONSTRAINED_ARRAY_TYPE
))
4229 /* If we are global, we don't want to actually output the DECL_EXPR for
4230 this decl since we already have evaluated the expressions in the
4231 sizes and positions as globals and doing it again would be wrong.
4232 But we do have to mark everything as used. */
4233 gnu_stmt
= build1 (DECL_EXPR
, void_type_node
, gnu_decl
);
4234 if (!global_bindings_p ())
4235 add_stmt_with_node (gnu_stmt
, gnat_entity
);
4238 walk_tree (&gnu_stmt
, mark_visited
, NULL
, NULL
);
4239 if (TREE_CODE (gnu_decl
) == VAR_DECL
4240 || TREE_CODE (gnu_decl
) == CONST_DECL
)
4242 walk_tree (&DECL_SIZE (gnu_decl
), mark_visited
, NULL
, NULL
);
4243 walk_tree (&DECL_SIZE_UNIT (gnu_decl
), mark_visited
, NULL
, NULL
);
4244 walk_tree (&DECL_INITIAL (gnu_decl
), mark_visited
, NULL
, NULL
);
4248 /* If this is a DECL_EXPR for a variable with DECL_INITIAl set,
4249 there are two cases we need to handle here. */
4250 if (TREE_CODE (gnu_decl
) == VAR_DECL
&& DECL_INITIAL (gnu_decl
))
4252 tree gnu_init
= DECL_INITIAL (gnu_decl
);
4253 tree gnu_lhs
= NULL_TREE
;
4255 /* If this is a DECL_EXPR for a variable with DECL_INITIAL set
4256 and decl has a padded type, convert it to the unpadded type so the
4257 assignment is done properly. */
4258 if (TREE_CODE (TREE_TYPE (gnu_decl
)) == RECORD_TYPE
4259 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_decl
)))
4261 = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_decl
))), gnu_decl
);
4263 /* Otherwise, if this is going into memory and the initializer isn't
4264 valid for the assembler and loader. Gimplification could do this,
4265 but would be run too late if -fno-unit-at-a-time. */
4266 else if (TREE_STATIC (gnu_decl
)
4267 && !initializer_constant_valid_p (gnu_init
,
4268 TREE_TYPE (gnu_decl
)))
4273 tree gnu_assign_stmt
4274 = build_binary_op (MODIFY_EXPR
, NULL_TREE
,
4275 gnu_lhs
, DECL_INITIAL (gnu_decl
));
4277 DECL_INITIAL (gnu_decl
) = 0;
4278 TREE_READONLY (gnu_decl
) = 0;
4279 annotate_with_locus (gnu_assign_stmt
,
4280 DECL_SOURCE_LOCATION (gnu_decl
));
4281 add_stmt (gnu_assign_stmt
);
4286 /* Utility function to mark nodes with TREE_VISITED. Called from walk_tree.
4287 We use this to indicate all variable sizes and positions in global types
4288 may not be shared by any subprogram. */
4291 mark_visited (tree
*tp
, int *walk_subtrees
, void *data ATTRIBUTE_UNUSED
)
4293 if (TREE_VISITED (*tp
))
4296 /* Don't mark a dummy type as visited because we want to mark its sizes
4297 and fields once it's filled in. */
4298 else if (!TYPE_IS_DUMMY_P (*tp
))
4299 TREE_VISITED (*tp
) = 1;
4304 /* Likewise, but to mark as unvisited. */
4307 mark_unvisited (tree
*tp
, int *walk_subtrees ATTRIBUTE_UNUSED
,
4308 void *data ATTRIBUTE_UNUSED
)
4310 TREE_VISITED (*tp
) = 0;
4315 /* Add GNU_CLEANUP, a cleanup action, to the current code group. */
4318 add_cleanup (tree gnu_cleanup
)
4320 append_to_statement_list (gnu_cleanup
, ¤t_stmt_group
->cleanups
);
4323 /* Set the BLOCK node corresponding to the current code group to GNU_BLOCK. */
4326 set_block_for_group (tree gnu_block
)
4328 gcc_assert (!current_stmt_group
->block
);
4329 current_stmt_group
->block
= gnu_block
;
4332 /* Return code corresponding to the current code group. It is normally
4333 a STATEMENT_LIST, but may also be a BIND_EXPR or TRY_FINALLY_EXPR if
4334 BLOCK or cleanups were set. */
4339 struct stmt_group
*group
= current_stmt_group
;
4340 tree gnu_retval
= group
->stmt_list
;
4342 /* If this is a null list, allocate a new STATEMENT_LIST. Then, if there
4343 are cleanups, make a TRY_FINALLY_EXPR. Last, if there is a BLOCK,
4344 make a BIND_EXPR. Note that we nest in that because the cleanup may
4345 reference variables in the block. */
4346 if (gnu_retval
== NULL_TREE
)
4347 gnu_retval
= alloc_stmt_list ();
4349 if (group
->cleanups
)
4350 gnu_retval
= build2 (TRY_FINALLY_EXPR
, void_type_node
, gnu_retval
,
4353 if (current_stmt_group
->block
)
4354 gnu_retval
= build3 (BIND_EXPR
, void_type_node
, BLOCK_VARS (group
->block
),
4355 gnu_retval
, group
->block
);
4357 /* Remove this group from the stack and add it to the free list. */
4358 current_stmt_group
= group
->previous
;
4359 group
->previous
= stmt_group_free_list
;
4360 stmt_group_free_list
= group
;
4365 /* Add a list of statements from GNAT_LIST, a possibly-empty list of
4369 add_stmt_list (List_Id gnat_list
)
4373 if (Present (gnat_list
))
4374 for (gnat_node
= First (gnat_list
); Present (gnat_node
);
4375 gnat_node
= Next (gnat_node
))
4376 add_stmt (gnat_to_gnu (gnat_node
));
4379 /* Build a tree from GNAT_LIST, a possibly-empty list of statements.
4380 If BINDING_P is true, push and pop a binding level around the list. */
4383 build_stmt_group (List_Id gnat_list
, bool binding_p
)
4385 start_stmt_group ();
4389 add_stmt_list (gnat_list
);
4393 return end_stmt_group ();
4396 /* Push and pop routines for stacks. We keep a free list around so we
4397 don't waste tree nodes. */
4400 push_stack (tree
*gnu_stack_ptr
, tree gnu_purpose
, tree gnu_value
)
4402 tree gnu_node
= gnu_stack_free_list
;
4406 gnu_stack_free_list
= TREE_CHAIN (gnu_node
);
4407 TREE_CHAIN (gnu_node
) = *gnu_stack_ptr
;
4408 TREE_PURPOSE (gnu_node
) = gnu_purpose
;
4409 TREE_VALUE (gnu_node
) = gnu_value
;
4412 gnu_node
= tree_cons (gnu_purpose
, gnu_value
, *gnu_stack_ptr
);
4414 *gnu_stack_ptr
= gnu_node
;
4418 pop_stack (tree
*gnu_stack_ptr
)
4420 tree gnu_node
= *gnu_stack_ptr
;
4422 *gnu_stack_ptr
= TREE_CHAIN (gnu_node
);
4423 TREE_CHAIN (gnu_node
) = gnu_stack_free_list
;
4424 gnu_stack_free_list
= gnu_node
;
4427 /* GNU_STMT is a statement. We generate code for that statement. */
4430 gnat_expand_stmt (tree gnu_stmt
)
4433 tree gnu_elmt
, gnu_elmt_2
;
4436 switch (TREE_CODE (gnu_stmt
))
4440 /* First write a volatile ASM_INPUT to prevent anything from being
4442 gnu_elmt
= gen_rtx_ASM_INPUT (VOIDmode
, "");
4443 MEM_VOLATILE_P (gnu_elmt
) = 1;
4444 emit_insn (gnu_elmt
);
4446 gnu_elmt
= expand_expr (TREE_OPERAND (gnu_stmt
, 0), NULL_RTX
, VOIDmode
,
4448 emit_insn (gen_rtx_USE (VOIDmode
, ));
4457 /* Generate GIMPLE in place for the expression at *EXPR_P. */
4460 gnat_gimplify_expr (tree
*expr_p
, tree
*pre_p
, tree
*post_p ATTRIBUTE_UNUSED
)
4462 tree expr
= *expr_p
;
4464 if (IS_ADA_STMT (expr
))
4465 return gnat_gimplify_stmt (expr_p
);
4467 switch (TREE_CODE (expr
))
4470 /* If this is for a scalar, just make a VAR_DECL for it. If for
4471 an aggregate, get a null pointer of the appropriate type and
4473 if (AGGREGATE_TYPE_P (TREE_TYPE (expr
)))
4474 *expr_p
= build1 (INDIRECT_REF
, TREE_TYPE (expr
),
4475 convert (build_pointer_type (TREE_TYPE (expr
)),
4476 integer_zero_node
));
4479 *expr_p
= create_tmp_var (TREE_TYPE (expr
), NULL
);
4480 TREE_NO_WARNING (*expr_p
) = 1;
4483 append_to_statement_list (TREE_OPERAND (expr
, 0), pre_p
);
4486 case UNCONSTRAINED_ARRAY_REF
:
4487 /* We should only do this if we are just elaborating for side-effects,
4488 but we can't know that yet. */
4489 *expr_p
= TREE_OPERAND (*expr_p
, 0);
4493 /* If we're taking the address of a constant CONSTRUCTOR, force it to
4494 be put into static memory. We know it's going to be readonly given
4495 the semantics we have and it's required to be static memory in
4496 the case when the reference is in an elaboration procedure. */
4497 if (TREE_CODE (TREE_OPERAND (expr
, 0)) == CONSTRUCTOR
4498 && TREE_CONSTANT (TREE_OPERAND (expr
, 0)))
4501 = create_tmp_var (TREE_TYPE (TREE_OPERAND (expr
, 0)), "C");
4503 TREE_READONLY (new_var
) = 1;
4504 TREE_STATIC (new_var
) = 1;
4505 TREE_ADDRESSABLE (new_var
) = 1;
4506 DECL_INITIAL (new_var
) = TREE_OPERAND (expr
, 0);
4508 TREE_OPERAND (expr
, 0) = new_var
;
4511 return GS_UNHANDLED
;
4514 /* We have a kludge here. If the FIELD_DECL is from a fat pointer and is
4515 from an early dummy type, replace it with the proper FIELD_DECL. */
4516 if (TYPE_FAT_POINTER_P (TREE_TYPE (TREE_OPERAND (*expr_p
, 0)))
4517 && DECL_ORIGINAL_FIELD (TREE_OPERAND (*expr_p
, 1)))
4519 TREE_OPERAND (*expr_p
, 1)
4520 = DECL_ORIGINAL_FIELD (TREE_OPERAND (*expr_p
, 1));
4524 /* ... fall through ... */
4527 return GS_UNHANDLED
;
4531 /* Generate GIMPLE in place for the statement at *STMT_P. */
4533 static enum gimplify_status
4534 gnat_gimplify_stmt (tree
*stmt_p
)
4536 tree stmt
= *stmt_p
;
4538 switch (TREE_CODE (stmt
))
4541 *stmt_p
= STMT_STMT_STMT (stmt
);
4545 *stmt_p
= NULL_TREE
;
4550 tree gnu_start_label
= create_artificial_label ();
4551 tree gnu_end_label
= LOOP_STMT_LABEL (stmt
);
4553 /* Set to emit the statements of the loop. */
4554 *stmt_p
= NULL_TREE
;
4556 /* We first emit the start label and then a conditional jump to
4557 the end label if there's a top condition, then the body of the
4558 loop, then a conditional branch to the end label, then the update,
4559 if any, and finally a jump to the start label and the definition
4560 of the end label. */
4561 append_to_statement_list (build1 (LABEL_EXPR
, void_type_node
,
4565 if (LOOP_STMT_TOP_COND (stmt
))
4566 append_to_statement_list (build3 (COND_EXPR
, void_type_node
,
4567 LOOP_STMT_TOP_COND (stmt
),
4574 append_to_statement_list (LOOP_STMT_BODY (stmt
), stmt_p
);
4576 if (LOOP_STMT_BOT_COND (stmt
))
4577 append_to_statement_list (build3 (COND_EXPR
, void_type_node
,
4578 LOOP_STMT_BOT_COND (stmt
),
4585 if (LOOP_STMT_UPDATE (stmt
))
4586 append_to_statement_list (LOOP_STMT_UPDATE (stmt
), stmt_p
);
4588 append_to_statement_list (build1 (GOTO_EXPR
, void_type_node
,
4591 append_to_statement_list (build1 (LABEL_EXPR
, void_type_node
,
4598 /* Build a statement to jump to the corresponding end label, then
4599 see if it needs to be conditional. */
4600 *stmt_p
= build1 (GOTO_EXPR
, void_type_node
, EXIT_STMT_LABEL (stmt
));
4601 if (EXIT_STMT_COND (stmt
))
4602 *stmt_p
= build3 (COND_EXPR
, void_type_node
,
4603 EXIT_STMT_COND (stmt
), *stmt_p
, alloc_stmt_list ());
4611 /* Force references to each of the entities in packages GNAT_NODE with's
4612 so that the debugging information for all of them are identical
4613 in all clients. Operate recursively on anything it with's, but check
4614 that we aren't elaborating something more than once. */
4616 /* The reason for this routine's existence is two-fold.
4617 First, with some debugging formats, notably MDEBUG on SGI
4618 IRIX, the linker will remove duplicate debugging information if two
4619 clients have identical debugguing information. With the normal scheme
4620 of elaboration, this does not usually occur, since entities in with'ed
4621 packages are elaborated on demand, and if clients have different usage
4622 patterns, the normal case, then the order and selection of entities
4623 will differ. In most cases however, it seems that linkers do not know
4624 how to eliminate duplicate debugging information, even if it is
4625 identical, so the use of this routine would increase the total amount
4626 of debugging information in the final executable.
4628 Second, this routine is called in type_annotate mode, to compute DDA
4629 information for types in withed units, for ASIS use */
4632 elaborate_all_entities (Node_Id gnat_node
)
4634 Entity_Id gnat_with_clause
, gnat_entity
;
4636 /* Process each unit only once. As we trace the context of all relevant
4637 units transitively, including generic bodies, we may encounter the
4638 same generic unit repeatedly */
4640 if (!present_gnu_tree (gnat_node
))
4641 save_gnu_tree (gnat_node
, integer_zero_node
, true);
4643 /* Save entities in all context units. A body may have an implicit_with
4644 on its own spec, if the context includes a child unit, so don't save
4647 for (gnat_with_clause
= First (Context_Items (gnat_node
));
4648 Present (gnat_with_clause
);
4649 gnat_with_clause
= Next (gnat_with_clause
))
4650 if (Nkind (gnat_with_clause
) == N_With_Clause
4651 && !present_gnu_tree (Library_Unit (gnat_with_clause
))
4652 && Library_Unit (gnat_with_clause
) != Library_Unit (Cunit (Main_Unit
)))
4654 elaborate_all_entities (Library_Unit (gnat_with_clause
));
4656 if (Ekind (Entity (Name (gnat_with_clause
))) == E_Package
)
4658 for (gnat_entity
= First_Entity (Entity (Name (gnat_with_clause
)));
4659 Present (gnat_entity
);
4660 gnat_entity
= Next_Entity (gnat_entity
))
4661 if (Is_Public (gnat_entity
)
4662 && Convention (gnat_entity
) != Convention_Intrinsic
4663 && Ekind (gnat_entity
) != E_Package
4664 && Ekind (gnat_entity
) != E_Package_Body
4665 && Ekind (gnat_entity
) != E_Operator
4666 && !(IN (Ekind (gnat_entity
), Type_Kind
)
4667 && !Is_Frozen (gnat_entity
))
4668 && !((Ekind (gnat_entity
) == E_Procedure
4669 || Ekind (gnat_entity
) == E_Function
)
4670 && Is_Intrinsic_Subprogram (gnat_entity
))
4671 && !IN (Ekind (gnat_entity
), Named_Kind
)
4672 && !IN (Ekind (gnat_entity
), Generic_Unit_Kind
))
4673 gnat_to_gnu_entity (gnat_entity
, NULL_TREE
, 0);
4675 else if (Ekind (Entity (Name (gnat_with_clause
))) == E_Generic_Package
)
4678 = Corresponding_Body (Unit (Library_Unit (gnat_with_clause
)));
4680 /* Retrieve compilation unit node of generic body. */
4681 while (Present (gnat_body
)
4682 && Nkind (gnat_body
) != N_Compilation_Unit
)
4683 gnat_body
= Parent (gnat_body
);
4685 /* If body is available, elaborate its context. */
4686 if (Present (gnat_body
))
4687 elaborate_all_entities (gnat_body
);
4691 if (Nkind (Unit (gnat_node
)) == N_Package_Body
&& type_annotate_only
)
4692 elaborate_all_entities (Library_Unit (gnat_node
));
4695 /* Do the processing of N_Freeze_Entity, GNAT_NODE. */
4698 process_freeze_entity (Node_Id gnat_node
)
4700 Entity_Id gnat_entity
= Entity (gnat_node
);
4704 = (Nkind (Declaration_Node (gnat_entity
)) == N_Object_Declaration
4705 && present_gnu_tree (Declaration_Node (gnat_entity
)))
4706 ? get_gnu_tree (Declaration_Node (gnat_entity
)) : NULL_TREE
;
4708 /* If this is a package, need to generate code for the package. */
4709 if (Ekind (gnat_entity
) == E_Package
)
4712 (Parent (Corresponding_Body
4713 (Parent (Declaration_Node (gnat_entity
)))));
4717 /* Check for old definition after the above call. This Freeze_Node
4718 might be for one its Itypes. */
4720 = present_gnu_tree (gnat_entity
) ? get_gnu_tree (gnat_entity
) : 0;
4722 /* If this entity has an Address representation clause, GNU_OLD is the
4723 address, so discard it here. */
4724 if (Present (Address_Clause (gnat_entity
)))
4727 /* Don't do anything for class-wide types they are always
4728 transformed into their root type. */
4729 if (Ekind (gnat_entity
) == E_Class_Wide_Type
4730 || (Ekind (gnat_entity
) == E_Class_Wide_Subtype
4731 && Present (Equivalent_Type (gnat_entity
))))
4734 /* Don't do anything for subprograms that may have been elaborated before
4735 their freeze nodes. This can happen, for example because of an inner call
4736 in an instance body. */
4738 && TREE_CODE (gnu_old
) == FUNCTION_DECL
4739 && (Ekind (gnat_entity
) == E_Function
4740 || Ekind (gnat_entity
) == E_Procedure
))
4743 /* If we have a non-dummy type old tree, we have nothing to do. Unless
4744 this is the public view of a private type whose full view was not
4745 delayed, this node was never delayed as it should have been.
4746 Also allow this to happen for concurrent types since we may have
4747 frozen both the Corresponding_Record_Type and this type. */
4749 && !(TREE_CODE (gnu_old
) == TYPE_DECL
4750 && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_old
))))
4752 gcc_assert ((IN (Ekind (gnat_entity
), Incomplete_Or_Private_Kind
)
4753 && Present (Full_View (gnat_entity
))
4754 && No (Freeze_Node (Full_View (gnat_entity
))))
4755 || Is_Concurrent_Type (gnat_entity
));
4759 /* Reset the saved tree, if any, and elaborate the object or type for real.
4760 If there is a full declaration, elaborate it and copy the type to
4761 GNAT_ENTITY. Likewise if this is the record subtype corresponding to
4762 a class wide type or subtype. */
4765 save_gnu_tree (gnat_entity
, NULL_TREE
, false);
4766 if (IN (Ekind (gnat_entity
), Incomplete_Or_Private_Kind
)
4767 && Present (Full_View (gnat_entity
))
4768 && present_gnu_tree (Full_View (gnat_entity
)))
4769 save_gnu_tree (Full_View (gnat_entity
), NULL_TREE
, false);
4770 if (Present (Class_Wide_Type (gnat_entity
))
4771 && Class_Wide_Type (gnat_entity
) != gnat_entity
)
4772 save_gnu_tree (Class_Wide_Type (gnat_entity
), NULL_TREE
, false);
4775 if (IN (Ekind (gnat_entity
), Incomplete_Or_Private_Kind
)
4776 && Present (Full_View (gnat_entity
)))
4778 gnu_new
= gnat_to_gnu_entity (Full_View (gnat_entity
), NULL_TREE
, 1);
4780 /* The above call may have defined this entity (the simplest example
4781 of this is when we have a private enumeral type since the bounds
4782 will have the public view. */
4783 if (!present_gnu_tree (gnat_entity
))
4784 save_gnu_tree (gnat_entity
, gnu_new
, false);
4785 if (Present (Class_Wide_Type (gnat_entity
))
4786 && Class_Wide_Type (gnat_entity
) != gnat_entity
)
4787 save_gnu_tree (Class_Wide_Type (gnat_entity
), gnu_new
, false);
4790 gnu_new
= gnat_to_gnu_entity (gnat_entity
, gnu_init
, 1);
4792 /* If we've made any pointers to the old version of this type, we
4793 have to update them. */
4795 update_pointer_to (TYPE_MAIN_VARIANT (TREE_TYPE (gnu_old
)),
4796 TREE_TYPE (gnu_new
));
4799 /* Process the list of inlined subprograms of GNAT_NODE, which is an
4800 N_Compilation_Unit. */
4803 process_inlined_subprograms (Node_Id gnat_node
)
4805 Entity_Id gnat_entity
;
4808 /* If we can inline, generate RTL for all the inlined subprograms.
4809 Define the entity first so we set DECL_EXTERNAL. */
4810 if (optimize
> 0 && !flag_no_inline
)
4811 for (gnat_entity
= First_Inlined_Subprogram (gnat_node
);
4812 Present (gnat_entity
);
4813 gnat_entity
= Next_Inlined_Subprogram (gnat_entity
))
4815 gnat_body
= Parent (Declaration_Node (gnat_entity
));
4817 if (Nkind (gnat_body
) != N_Subprogram_Body
)
4819 /* ??? This really should always be Present. */
4820 if (No (Corresponding_Body (gnat_body
)))
4824 = Parent (Declaration_Node (Corresponding_Body (gnat_body
)));
4827 if (Present (gnat_body
))
4829 gnat_to_gnu_entity (gnat_entity
, NULL_TREE
, 0);
4830 add_stmt (gnat_to_gnu (gnat_body
));
4835 /* Elaborate decls in the lists GNAT_DECLS and GNAT_DECLS2, if present.
4836 We make two passes, one to elaborate anything other than bodies (but
4837 we declare a function if there was no spec). The second pass
4838 elaborates the bodies.
4840 GNAT_END_LIST gives the element in the list past the end. Normally,
4841 this is Empty, but can be First_Real_Statement for a
4842 Handled_Sequence_Of_Statements.
4844 We make a complete pass through both lists if PASS1P is true, then make
4845 the second pass over both lists if PASS2P is true. The lists usually
4846 correspond to the public and private parts of a package. */
4849 process_decls (List_Id gnat_decls
, List_Id gnat_decls2
,
4850 Node_Id gnat_end_list
, bool pass1p
, bool pass2p
)
4852 List_Id gnat_decl_array
[2];
4856 gnat_decl_array
[0] = gnat_decls
, gnat_decl_array
[1] = gnat_decls2
;
4859 for (i
= 0; i
<= 1; i
++)
4860 if (Present (gnat_decl_array
[i
]))
4861 for (gnat_decl
= First (gnat_decl_array
[i
]);
4862 gnat_decl
!= gnat_end_list
; gnat_decl
= Next (gnat_decl
))
4864 /* For package specs, we recurse inside the declarations,
4865 thus taking the two pass approach inside the boundary. */
4866 if (Nkind (gnat_decl
) == N_Package_Declaration
4867 && (Nkind (Specification (gnat_decl
)
4868 == N_Package_Specification
)))
4869 process_decls (Visible_Declarations (Specification (gnat_decl
)),
4870 Private_Declarations (Specification (gnat_decl
)),
4871 Empty
, true, false);
4873 /* Similarly for any declarations in the actions of a
4875 else if (Nkind (gnat_decl
) == N_Freeze_Entity
)
4877 process_freeze_entity (gnat_decl
);
4878 process_decls (Actions (gnat_decl
), Empty
, Empty
, true, false);
4881 /* Package bodies with freeze nodes get their elaboration deferred
4882 until the freeze node, but the code must be placed in the right
4883 place, so record the code position now. */
4884 else if (Nkind (gnat_decl
) == N_Package_Body
4885 && Present (Freeze_Node (Corresponding_Spec (gnat_decl
))))
4886 record_code_position (gnat_decl
);
4888 else if (Nkind (gnat_decl
) == N_Package_Body_Stub
4889 && Present (Library_Unit (gnat_decl
))
4890 && Present (Freeze_Node
4893 (Library_Unit (gnat_decl
)))))))
4894 record_code_position
4895 (Proper_Body (Unit (Library_Unit (gnat_decl
))));
4897 /* We defer most subprogram bodies to the second pass. */
4898 else if (Nkind (gnat_decl
) == N_Subprogram_Body
)
4900 if (Acts_As_Spec (gnat_decl
))
4902 Node_Id gnat_subprog_id
= Defining_Entity (gnat_decl
);
4904 if (Ekind (gnat_subprog_id
) != E_Generic_Procedure
4905 && Ekind (gnat_subprog_id
) != E_Generic_Function
)
4906 gnat_to_gnu_entity (gnat_subprog_id
, NULL_TREE
, 1);
4909 /* For bodies and stubs that act as their own specs, the entity
4910 itself must be elaborated in the first pass, because it may
4911 be used in other declarations. */
4912 else if (Nkind (gnat_decl
) == N_Subprogram_Body_Stub
)
4914 Node_Id gnat_subprog_id
=
4915 Defining_Entity (Specification (gnat_decl
));
4917 if (Ekind (gnat_subprog_id
) != E_Subprogram_Body
4918 && Ekind (gnat_subprog_id
) != E_Generic_Procedure
4919 && Ekind (gnat_subprog_id
) != E_Generic_Function
)
4920 gnat_to_gnu_entity (gnat_subprog_id
, NULL_TREE
, 1);
4923 /* Concurrent stubs stand for the corresponding subprogram bodies,
4924 which are deferred like other bodies. */
4925 else if (Nkind (gnat_decl
) == N_Task_Body_Stub
4926 || Nkind (gnat_decl
) == N_Protected_Body_Stub
)
4929 add_stmt (gnat_to_gnu (gnat_decl
));
4932 /* Here we elaborate everything we deferred above except for package bodies,
4933 which are elaborated at their freeze nodes. Note that we must also
4934 go inside things (package specs and freeze nodes) the first pass did. */
4936 for (i
= 0; i
<= 1; i
++)
4937 if (Present (gnat_decl_array
[i
]))
4938 for (gnat_decl
= First (gnat_decl_array
[i
]);
4939 gnat_decl
!= gnat_end_list
; gnat_decl
= Next (gnat_decl
))
4941 if (Nkind (gnat_decl
) == N_Subprogram_Body
4942 || Nkind (gnat_decl
) == N_Subprogram_Body_Stub
4943 || Nkind (gnat_decl
) == N_Task_Body_Stub
4944 || Nkind (gnat_decl
) == N_Protected_Body_Stub
)
4945 add_stmt (gnat_to_gnu (gnat_decl
));
4947 else if (Nkind (gnat_decl
) == N_Package_Declaration
4948 && (Nkind (Specification (gnat_decl
)
4949 == N_Package_Specification
)))
4950 process_decls (Visible_Declarations (Specification (gnat_decl
)),
4951 Private_Declarations (Specification (gnat_decl
)),
4952 Empty
, false, true);
4954 else if (Nkind (gnat_decl
) == N_Freeze_Entity
)
4955 process_decls (Actions (gnat_decl
), Empty
, Empty
, false, true);
4959 /* Emit code for a range check. GNU_EXPR is the expression to be checked,
4960 GNAT_RANGE_TYPE the gnat type or subtype containing the bounds against
4961 which we have to check. */
4964 emit_range_check (tree gnu_expr
, Entity_Id gnat_range_type
)
4966 tree gnu_range_type
= get_unpadded_type (gnat_range_type
);
4967 tree gnu_low
= TYPE_MIN_VALUE (gnu_range_type
);
4968 tree gnu_high
= TYPE_MAX_VALUE (gnu_range_type
);
4969 tree gnu_compare_type
= get_base_type (TREE_TYPE (gnu_expr
));
4971 /* If GNU_EXPR has an integral type that is narrower than GNU_RANGE_TYPE,
4972 we can't do anything since we might be truncating the bounds. No
4973 check is needed in this case. */
4974 if (INTEGRAL_TYPE_P (TREE_TYPE (gnu_expr
))
4975 && (TYPE_PRECISION (gnu_compare_type
)
4976 < TYPE_PRECISION (get_base_type (gnu_range_type
))))
4979 /* Checked expressions must be evaluated only once. */
4980 gnu_expr
= protect_multiple_eval (gnu_expr
);
4982 /* There's no good type to use here, so we might as well use
4983 integer_type_node. Note that the form of the check is
4984 (not (expr >= lo)) or (not (expr >= hi))
4985 the reason for this slightly convoluted form is that NaN's
4986 are not considered to be in range in the float case. */
4988 (build_binary_op (TRUTH_ORIF_EXPR
, integer_type_node
,
4990 (build_binary_op (GE_EXPR
, integer_type_node
,
4991 convert (gnu_compare_type
, gnu_expr
),
4992 convert (gnu_compare_type
, gnu_low
))),
4994 (build_binary_op (LE_EXPR
, integer_type_node
,
4995 convert (gnu_compare_type
, gnu_expr
),
4996 convert (gnu_compare_type
,
4998 gnu_expr
, CE_Range_Check_Failed
);
5001 /* Emit code for an index check. GNU_ARRAY_OBJECT is the array object
5002 which we are about to index, GNU_EXPR is the index expression to be
5003 checked, GNU_LOW and GNU_HIGH are the lower and upper bounds
5004 against which GNU_EXPR has to be checked. Note that for index
5005 checking we cannot use the emit_range_check function (although very
5006 similar code needs to be generated in both cases) since for index
5007 checking the array type against which we are checking the indeces
5008 may be unconstrained and consequently we need to retrieve the
5009 actual index bounds from the array object itself
5010 (GNU_ARRAY_OBJECT). The place where we need to do that is in
5011 subprograms having unconstrained array formal parameters */
5014 emit_index_check (tree gnu_array_object
,
5019 tree gnu_expr_check
;
5021 /* Checked expressions must be evaluated only once. */
5022 gnu_expr
= protect_multiple_eval (gnu_expr
);
5024 /* Must do this computation in the base type in case the expression's
5025 type is an unsigned subtypes. */
5026 gnu_expr_check
= convert (get_base_type (TREE_TYPE (gnu_expr
)), gnu_expr
);
5028 /* If GNU_LOW or GNU_HIGH are a PLACEHOLDER_EXPR, qualify them by
5029 the object we are handling. */
5030 gnu_low
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_low
, gnu_array_object
);
5031 gnu_high
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_high
, gnu_array_object
);
5033 /* There's no good type to use here, so we might as well use
5034 integer_type_node. */
5036 (build_binary_op (TRUTH_ORIF_EXPR
, integer_type_node
,
5037 build_binary_op (LT_EXPR
, integer_type_node
,
5039 convert (TREE_TYPE (gnu_expr_check
),
5041 build_binary_op (GT_EXPR
, integer_type_node
,
5043 convert (TREE_TYPE (gnu_expr_check
),
5045 gnu_expr
, CE_Index_Check_Failed
);
5048 /* GNU_COND contains the condition corresponding to an access, discriminant or
5049 range check of value GNU_EXPR. Build a COND_EXPR that returns GNU_EXPR if
5050 GNU_COND is false and raises a CONSTRAINT_ERROR if GNU_COND is true.
5051 REASON is the code that says why the exception was raised. */
5054 emit_check (tree gnu_cond
, tree gnu_expr
, int reason
)
5059 gnu_call
= build_call_raise (reason
);
5061 /* Use an outer COMPOUND_EXPR to make sure that GNU_EXPR will get evaluated
5062 in front of the comparison in case it ends up being a SAVE_EXPR. Put the
5063 whole thing inside its own SAVE_EXPR so the inner SAVE_EXPR doesn't leak
5065 gnu_result
= fold (build3 (COND_EXPR
, TREE_TYPE (gnu_expr
), gnu_cond
,
5066 build2 (COMPOUND_EXPR
, TREE_TYPE (gnu_expr
),
5067 gnu_call
, gnu_expr
),
5070 /* If GNU_EXPR has side effects, make the outer COMPOUND_EXPR and
5071 protect it. Otherwise, show GNU_RESULT has no side effects: we
5072 don't need to evaluate it just for the check. */
5073 if (TREE_SIDE_EFFECTS (gnu_expr
))
5075 = build2 (COMPOUND_EXPR
, TREE_TYPE (gnu_expr
), gnu_expr
, gnu_result
);
5077 TREE_SIDE_EFFECTS (gnu_result
) = 0;
5079 /* ??? Unfortunately, if we don't put a SAVE_EXPR around this whole thing,
5080 we will repeatedly do the test. It would be nice if GCC was able
5081 to optimize this and only do it once. */
5082 return save_expr (gnu_result
);
5085 /* Return an expression that converts GNU_EXPR to GNAT_TYPE, doing
5086 overflow checks if OVERFLOW_P is nonzero and range checks if
5087 RANGE_P is nonzero. GNAT_TYPE is known to be an integral type.
5088 If TRUNCATE_P is nonzero, do a float to integer conversion with
5089 truncation; otherwise round. */
5092 convert_with_check (Entity_Id gnat_type
, tree gnu_expr
, bool overflowp
,
5093 bool rangep
, bool truncatep
)
5095 tree gnu_type
= get_unpadded_type (gnat_type
);
5096 tree gnu_in_type
= TREE_TYPE (gnu_expr
);
5097 tree gnu_in_basetype
= get_base_type (gnu_in_type
);
5098 tree gnu_base_type
= get_base_type (gnu_type
);
5099 tree gnu_ada_base_type
= get_ada_base_type (gnu_type
);
5100 tree gnu_result
= gnu_expr
;
5102 /* If we are not doing any checks, the output is an integral type, and
5103 the input is not a floating type, just do the conversion. This
5104 shortcut is required to avoid problems with packed array types
5105 and simplifies code in all cases anyway. */
5106 if (!rangep
&& !overflowp
&& INTEGRAL_TYPE_P (gnu_base_type
)
5107 && !FLOAT_TYPE_P (gnu_in_type
))
5108 return convert (gnu_type
, gnu_expr
);
5110 /* First convert the expression to its base type. This
5111 will never generate code, but makes the tests below much simpler.
5112 But don't do this if converting from an integer type to an unconstrained
5113 array type since then we need to get the bounds from the original
5115 if (TREE_CODE (gnu_type
) != UNCONSTRAINED_ARRAY_TYPE
)
5116 gnu_result
= convert (gnu_in_basetype
, gnu_result
);
5118 /* If overflow checks are requested, we need to be sure the result will
5119 fit in the output base type. But don't do this if the input
5120 is integer and the output floating-point. */
5122 && !(FLOAT_TYPE_P (gnu_base_type
) && INTEGRAL_TYPE_P (gnu_in_basetype
)))
5124 /* Ensure GNU_EXPR only gets evaluated once. */
5125 tree gnu_input
= protect_multiple_eval (gnu_result
);
5126 tree gnu_cond
= integer_zero_node
;
5127 tree gnu_in_lb
= TYPE_MIN_VALUE (gnu_in_basetype
);
5128 tree gnu_in_ub
= TYPE_MAX_VALUE (gnu_in_basetype
);
5129 tree gnu_out_lb
= TYPE_MIN_VALUE (gnu_base_type
);
5130 tree gnu_out_ub
= TYPE_MAX_VALUE (gnu_base_type
);
5132 /* Convert the lower bounds to signed types, so we're sure we're
5133 comparing them properly. Likewise, convert the upper bounds
5134 to unsigned types. */
5135 if (INTEGRAL_TYPE_P (gnu_in_basetype
) && TYPE_UNSIGNED (gnu_in_basetype
))
5136 gnu_in_lb
= convert (gnat_signed_type (gnu_in_basetype
), gnu_in_lb
);
5138 if (INTEGRAL_TYPE_P (gnu_in_basetype
)
5139 && !TYPE_UNSIGNED (gnu_in_basetype
))
5140 gnu_in_ub
= convert (gnat_unsigned_type (gnu_in_basetype
), gnu_in_ub
);
5142 if (INTEGRAL_TYPE_P (gnu_base_type
) && TYPE_UNSIGNED (gnu_base_type
))
5143 gnu_out_lb
= convert (gnat_signed_type (gnu_base_type
), gnu_out_lb
);
5145 if (INTEGRAL_TYPE_P (gnu_base_type
) && !TYPE_UNSIGNED (gnu_base_type
))
5146 gnu_out_ub
= convert (gnat_unsigned_type (gnu_base_type
), gnu_out_ub
);
5148 /* Check each bound separately and only if the result bound
5149 is tighter than the bound on the input type. Note that all the
5150 types are base types, so the bounds must be constant. Also,
5151 the comparison is done in the base type of the input, which
5152 always has the proper signedness. First check for input
5153 integer (which means output integer), output float (which means
5154 both float), or mixed, in which case we always compare.
5155 Note that we have to do the comparison which would *fail* in the
5156 case of an error since if it's an FP comparison and one of the
5157 values is a NaN or Inf, the comparison will fail. */
5158 if (INTEGRAL_TYPE_P (gnu_in_basetype
)
5159 ? tree_int_cst_lt (gnu_in_lb
, gnu_out_lb
)
5160 : (FLOAT_TYPE_P (gnu_base_type
)
5161 ? REAL_VALUES_LESS (TREE_REAL_CST (gnu_in_lb
),
5162 TREE_REAL_CST (gnu_out_lb
))
5166 (build_binary_op (GE_EXPR
, integer_type_node
,
5167 gnu_input
, convert (gnu_in_basetype
,
5170 if (INTEGRAL_TYPE_P (gnu_in_basetype
)
5171 ? tree_int_cst_lt (gnu_out_ub
, gnu_in_ub
)
5172 : (FLOAT_TYPE_P (gnu_base_type
)
5173 ? REAL_VALUES_LESS (TREE_REAL_CST (gnu_out_ub
),
5174 TREE_REAL_CST (gnu_in_lb
))
5177 = build_binary_op (TRUTH_ORIF_EXPR
, integer_type_node
, gnu_cond
,
5179 (build_binary_op (LE_EXPR
, integer_type_node
,
5181 convert (gnu_in_basetype
,
5184 if (!integer_zerop (gnu_cond
))
5185 gnu_result
= emit_check (gnu_cond
, gnu_input
,
5186 CE_Overflow_Check_Failed
);
5189 /* Now convert to the result base type. If this is a non-truncating
5190 float-to-integer conversion, round. */
5191 if (INTEGRAL_TYPE_P (gnu_ada_base_type
) && FLOAT_TYPE_P (gnu_in_basetype
)
5194 tree gnu_point_5
= build_real (gnu_in_basetype
, dconstp5
);
5195 tree gnu_minus_point_5
= build_real (gnu_in_basetype
, dconstmp5
);
5196 tree gnu_zero
= convert (gnu_in_basetype
, integer_zero_node
);
5197 tree gnu_saved_result
= save_expr (gnu_result
);
5198 tree gnu_comp
= build2 (GE_EXPR
, integer_type_node
,
5199 gnu_saved_result
, gnu_zero
);
5200 tree gnu_adjust
= build3 (COND_EXPR
, gnu_in_basetype
, gnu_comp
,
5201 gnu_point_5
, gnu_minus_point_5
);
5204 = build2 (PLUS_EXPR
, gnu_in_basetype
, gnu_saved_result
, gnu_adjust
);
5207 if (TREE_CODE (gnu_ada_base_type
) == INTEGER_TYPE
5208 && TYPE_HAS_ACTUAL_BOUNDS_P (gnu_ada_base_type
)
5209 && TREE_CODE (gnu_result
) == UNCONSTRAINED_ARRAY_REF
)
5210 gnu_result
= unchecked_convert (gnu_ada_base_type
, gnu_result
, false);
5212 gnu_result
= convert (gnu_ada_base_type
, gnu_result
);
5214 /* Finally, do the range check if requested. Note that if the
5215 result type is a modular type, the range check is actually
5216 an overflow check. */
5219 || (TREE_CODE (gnu_base_type
) == INTEGER_TYPE
5220 && TYPE_MODULAR_P (gnu_base_type
) && overflowp
))
5221 gnu_result
= emit_range_check (gnu_result
, gnat_type
);
5223 return convert (gnu_type
, gnu_result
);
5226 /* Return 1 if GNU_EXPR can be directly addressed. This is the case unless
5227 it is an expression involving computation or if it involves a bitfield
5228 reference. This returns the same as gnat_mark_addressable in most
5232 addressable_p (tree gnu_expr
)
5234 switch (TREE_CODE (gnu_expr
))
5240 /* All DECLs are addressable: if they are in a register, we can force
5244 case UNCONSTRAINED_ARRAY_REF
:
5252 return (!DECL_BIT_FIELD (TREE_OPERAND (gnu_expr
, 1))
5253 && (!DECL_NONADDRESSABLE_P (TREE_OPERAND (gnu_expr
, 1))
5254 || !flag_strict_aliasing
)
5255 && addressable_p (TREE_OPERAND (gnu_expr
, 0)));
5257 case ARRAY_REF
: case ARRAY_RANGE_REF
:
5258 case REALPART_EXPR
: case IMAGPART_EXPR
:
5260 return addressable_p (TREE_OPERAND (gnu_expr
, 0));
5263 return (AGGREGATE_TYPE_P (TREE_TYPE (gnu_expr
))
5264 && addressable_p (TREE_OPERAND (gnu_expr
, 0)));
5266 case VIEW_CONVERT_EXPR
:
5268 /* This is addressable if we can avoid a copy. */
5269 tree type
= TREE_TYPE (gnu_expr
);
5270 tree inner_type
= TREE_TYPE (TREE_OPERAND (gnu_expr
, 0));
5272 return (((TYPE_MODE (type
) == TYPE_MODE (inner_type
)
5273 && (TYPE_ALIGN (type
) <= TYPE_ALIGN (inner_type
)
5274 || TYPE_ALIGN (inner_type
) >= BIGGEST_ALIGNMENT
))
5275 || ((TYPE_MODE (type
) == BLKmode
5276 || TYPE_MODE (inner_type
) == BLKmode
)
5277 && (TYPE_ALIGN (type
) <= TYPE_ALIGN (inner_type
)
5278 || TYPE_ALIGN (inner_type
) >= BIGGEST_ALIGNMENT
5279 || TYPE_ALIGN_OK (type
)
5280 || TYPE_ALIGN_OK (inner_type
))))
5281 && addressable_p (TREE_OPERAND (gnu_expr
, 0)));
5289 /* Do the processing for the declaration of a GNAT_ENTITY, a type. If
5290 a separate Freeze node exists, delay the bulk of the processing. Otherwise
5291 make a GCC type for GNAT_ENTITY and set up the correspondance. */
5294 process_type (Entity_Id gnat_entity
)
5297 = present_gnu_tree (gnat_entity
) ? get_gnu_tree (gnat_entity
) : 0;
5300 /* If we are to delay elaboration of this type, just do any
5301 elaborations needed for expressions within the declaration and
5302 make a dummy type entry for this node and its Full_View (if
5303 any) in case something points to it. Don't do this if it
5304 has already been done (the only way that can happen is if
5305 the private completion is also delayed). */
5306 if (Present (Freeze_Node (gnat_entity
))
5307 || (IN (Ekind (gnat_entity
), Incomplete_Or_Private_Kind
)
5308 && Present (Full_View (gnat_entity
))
5309 && Freeze_Node (Full_View (gnat_entity
))
5310 && !present_gnu_tree (Full_View (gnat_entity
))))
5312 elaborate_entity (gnat_entity
);
5316 tree gnu_decl
= create_type_decl (get_entity_name (gnat_entity
),
5317 make_dummy_type (gnat_entity
),
5318 NULL
, false, false, gnat_entity
);
5320 save_gnu_tree (gnat_entity
, gnu_decl
, false);
5321 if (IN (Ekind (gnat_entity
), Incomplete_Or_Private_Kind
)
5322 && Present (Full_View (gnat_entity
)))
5323 save_gnu_tree (Full_View (gnat_entity
), gnu_decl
, false);
5329 /* If we saved away a dummy type for this node it means that this
5330 made the type that corresponds to the full type of an incomplete
5331 type. Clear that type for now and then update the type in the
5335 if (TREE_CODE (gnu_old
) != TYPE_DECL
5336 || !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_old
)))
5338 /* If this was a withed access type, this is not an error
5339 and merely indicates we've already elaborated the type
5341 gcc_assert (Is_Type (gnat_entity
) && From_With_Type (gnat_entity
));
5345 save_gnu_tree (gnat_entity
, NULL_TREE
, false);
5348 /* Now fully elaborate the type. */
5349 gnu_new
= gnat_to_gnu_entity (gnat_entity
, NULL_TREE
, 1);
5350 gcc_assert (TREE_CODE (gnu_new
) == TYPE_DECL
);
5352 /* If we have an old type and we've made pointers to this type,
5353 update those pointers. */
5355 update_pointer_to (TYPE_MAIN_VARIANT (TREE_TYPE (gnu_old
)),
5356 TREE_TYPE (gnu_new
));
5358 /* If this is a record type corresponding to a task or protected type
5359 that is a completion of an incomplete type, perform a similar update
5361 /* ??? Including protected types here is a guess. */
5363 if (IN (Ekind (gnat_entity
), Record_Kind
)
5364 && Is_Concurrent_Record_Type (gnat_entity
)
5365 && present_gnu_tree (Corresponding_Concurrent_Type (gnat_entity
)))
5368 = get_gnu_tree (Corresponding_Concurrent_Type (gnat_entity
));
5370 save_gnu_tree (Corresponding_Concurrent_Type (gnat_entity
),
5372 save_gnu_tree (Corresponding_Concurrent_Type (gnat_entity
),
5375 update_pointer_to (TYPE_MAIN_VARIANT (TREE_TYPE (gnu_task_old
)),
5376 TREE_TYPE (gnu_new
));
5380 /* GNAT_ASSOC is the front of the Component_Associations of an N_Aggregate.
5381 GNU_TYPE is the GCC type of the corresponding record.
5383 Return a CONSTRUCTOR to build the record. */
5386 assoc_to_constructor (Node_Id gnat_assoc
, tree gnu_type
)
5388 tree gnu_list
, gnu_result
;
5390 /* We test for GNU_FIELD being empty in the case where a variant
5391 was the last thing since we don't take things off GNAT_ASSOC in
5392 that case. We check GNAT_ASSOC in case we have a variant, but it
5395 for (gnu_list
= NULL_TREE
; Present (gnat_assoc
);
5396 gnat_assoc
= Next (gnat_assoc
))
5398 Node_Id gnat_field
= First (Choices (gnat_assoc
));
5399 tree gnu_field
= gnat_to_gnu_entity (Entity (gnat_field
), NULL_TREE
, 0);
5400 tree gnu_expr
= gnat_to_gnu (Expression (gnat_assoc
));
5402 /* The expander is supposed to put a single component selector name
5403 in every record component association */
5404 gcc_assert (No (Next (gnat_field
)));
5406 /* Before assigning a value in an aggregate make sure range checks
5407 are done if required. Then convert to the type of the field. */
5408 if (Do_Range_Check (Expression (gnat_assoc
)))
5409 gnu_expr
= emit_range_check (gnu_expr
, Etype (gnat_field
));
5411 gnu_expr
= convert (TREE_TYPE (gnu_field
), gnu_expr
);
5413 /* Add the field and expression to the list. */
5414 gnu_list
= tree_cons (gnu_field
, gnu_expr
, gnu_list
);
5417 gnu_result
= extract_values (gnu_list
, gnu_type
);
5419 #ifdef ENABLE_CHECKING
5423 /* Verify every enty in GNU_LIST was used. */
5424 for (gnu_field
= gnu_list
; gnu_field
; gnu_field
= TREE_CHAIN (gnu_field
))
5425 gcc_assert (TREE_ADDRESSABLE (gnu_field
));
5432 /* Builds a possibly nested constructor for array aggregates. GNAT_EXPR
5433 is the first element of an array aggregate. It may itself be an
5434 aggregate (an array or record aggregate). GNU_ARRAY_TYPE is the gnu type
5435 corresponding to the array aggregate. GNAT_COMPONENT_TYPE is the type
5436 of the array component. It is needed for range checking. */
5439 pos_to_constructor (Node_Id gnat_expr
, tree gnu_array_type
,
5440 Entity_Id gnat_component_type
)
5442 tree gnu_expr_list
= NULL_TREE
;
5443 tree gnu_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (gnu_array_type
));
5446 for ( ; Present (gnat_expr
); gnat_expr
= Next (gnat_expr
))
5448 /* If the expression is itself an array aggregate then first build the
5449 innermost constructor if it is part of our array (multi-dimensional
5452 if (Nkind (gnat_expr
) == N_Aggregate
5453 && TREE_CODE (TREE_TYPE (gnu_array_type
)) == ARRAY_TYPE
5454 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_array_type
)))
5455 gnu_expr
= pos_to_constructor (First (Expressions (gnat_expr
)),
5456 TREE_TYPE (gnu_array_type
),
5457 gnat_component_type
);
5460 gnu_expr
= gnat_to_gnu (gnat_expr
);
5462 /* before assigning the element to the array make sure it is
5464 if (Do_Range_Check (gnat_expr
))
5465 gnu_expr
= emit_range_check (gnu_expr
, gnat_component_type
);
5469 = tree_cons (gnu_index
, convert (TREE_TYPE (gnu_array_type
), gnu_expr
),
5472 gnu_index
= int_const_binop (PLUS_EXPR
, gnu_index
, integer_one_node
, 0);
5475 return gnat_build_constructor (gnu_array_type
, nreverse (gnu_expr_list
));
5478 /* Subroutine of assoc_to_constructor: VALUES is a list of field associations,
5479 some of which are from RECORD_TYPE. Return a CONSTRUCTOR consisting
5480 of the associations that are from RECORD_TYPE. If we see an internal
5481 record, make a recursive call to fill it in as well. */
5484 extract_values (tree values
, tree record_type
)
5486 tree result
= NULL_TREE
;
5489 for (field
= TYPE_FIELDS (record_type
); field
; field
= TREE_CHAIN (field
))
5493 /* _Parent is an internal field, but may have values in the aggregate,
5494 so check for values first. */
5495 if ((tem
= purpose_member (field
, values
)))
5497 value
= TREE_VALUE (tem
);
5498 TREE_ADDRESSABLE (tem
) = 1;
5501 else if (DECL_INTERNAL_P (field
))
5503 value
= extract_values (values
, TREE_TYPE (field
));
5504 if (TREE_CODE (value
) == CONSTRUCTOR
&& !CONSTRUCTOR_ELTS (value
))
5508 /* If we have a record subtype, the names will match, but not the
5509 actual FIELD_DECLs. */
5510 for (tem
= values
; tem
; tem
= TREE_CHAIN (tem
))
5511 if (DECL_NAME (TREE_PURPOSE (tem
)) == DECL_NAME (field
))
5513 value
= convert (TREE_TYPE (field
), TREE_VALUE (tem
));
5514 TREE_ADDRESSABLE (tem
) = 1;
5520 result
= tree_cons (field
, value
, result
);
5523 return gnat_build_constructor (record_type
, nreverse (result
));
5526 /* EXP is to be treated as an array or record. Handle the cases when it is
5527 an access object and perform the required dereferences. */
5530 maybe_implicit_deref (tree exp
)
5532 /* If the type is a pointer, dereference it. */
5534 if (POINTER_TYPE_P (TREE_TYPE (exp
)) || TYPE_FAT_POINTER_P (TREE_TYPE (exp
)))
5535 exp
= build_unary_op (INDIRECT_REF
, NULL_TREE
, exp
);
5537 /* If we got a padded type, remove it too. */
5538 if (TREE_CODE (TREE_TYPE (exp
)) == RECORD_TYPE
5539 && TYPE_IS_PADDING_P (TREE_TYPE (exp
)))
5540 exp
= convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (exp
))), exp
);
5545 /* Protect EXP from multiple evaluation. This may make a SAVE_EXPR. */
5548 protect_multiple_eval (tree exp
)
5550 tree type
= TREE_TYPE (exp
);
5552 /* If this has no side effects, we don't need to do anything. */
5553 if (!TREE_SIDE_EFFECTS (exp
))
5556 /* If it is a conversion, protect what's inside the conversion.
5557 Similarly, if we're indirectly referencing something, we only
5558 actually need to protect the address since the data itself can't
5559 change in these situations. */
5560 else if (TREE_CODE (exp
) == NON_LVALUE_EXPR
5561 || TREE_CODE (exp
) == NOP_EXPR
|| TREE_CODE (exp
) == CONVERT_EXPR
5562 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
5563 || TREE_CODE (exp
) == INDIRECT_REF
5564 || TREE_CODE (exp
) == UNCONSTRAINED_ARRAY_REF
)
5565 return build1 (TREE_CODE (exp
), type
,
5566 protect_multiple_eval (TREE_OPERAND (exp
, 0)));
5568 /* If EXP is a fat pointer or something that can be placed into a register,
5569 just make a SAVE_EXPR. */
5570 if (TYPE_FAT_POINTER_P (type
) || TYPE_MODE (type
) != BLKmode
)
5571 return save_expr (exp
);
5573 /* Otherwise, dereference, protect the address, and re-reference. */
5576 build_unary_op (INDIRECT_REF
, type
,
5577 save_expr (build_unary_op (ADDR_EXPR
,
5578 build_reference_type (type
),
5582 /* This is equivalent to stabilize_reference in GCC's tree.c, but we know
5583 how to handle our new nodes and we take an extra argument that says
5584 whether to force evaluation of everything. */
5587 gnat_stabilize_reference (tree ref
, bool force
)
5589 tree type
= TREE_TYPE (ref
);
5590 enum tree_code code
= TREE_CODE (ref
);
5598 /* No action is needed in this case. */
5604 case FIX_TRUNC_EXPR
:
5605 case FIX_FLOOR_EXPR
:
5606 case FIX_ROUND_EXPR
:
5608 case VIEW_CONVERT_EXPR
:
5611 = build1 (code
, type
,
5612 gnat_stabilize_reference (TREE_OPERAND (ref
, 0), force
));
5616 case UNCONSTRAINED_ARRAY_REF
:
5617 result
= build1 (code
, type
,
5618 gnat_stabilize_reference_1 (TREE_OPERAND (ref
, 0),
5623 result
= build3 (COMPONENT_REF
, type
,
5624 gnat_stabilize_reference (TREE_OPERAND (ref
, 0),
5626 TREE_OPERAND (ref
, 1), NULL_TREE
);
5630 result
= build3 (BIT_FIELD_REF
, type
,
5631 gnat_stabilize_reference (TREE_OPERAND (ref
, 0), force
),
5632 gnat_stabilize_reference_1 (TREE_OPERAND (ref
, 1),
5634 gnat_stabilize_reference_1 (TREE_OPERAND (ref
, 2),
5639 case ARRAY_RANGE_REF
:
5640 result
= build4 (code
, type
,
5641 gnat_stabilize_reference (TREE_OPERAND (ref
, 0), force
),
5642 gnat_stabilize_reference_1 (TREE_OPERAND (ref
, 1),
5644 NULL_TREE
, NULL_TREE
);
5648 result
= build2 (COMPOUND_EXPR
, type
,
5649 gnat_stabilize_reference_1 (TREE_OPERAND (ref
, 0),
5651 gnat_stabilize_reference (TREE_OPERAND (ref
, 1),
5655 /* If arg isn't a kind of lvalue we recognize, make no change.
5656 Caller should recognize the error for an invalid lvalue. */
5661 return error_mark_node
;
5664 TREE_READONLY (result
) = TREE_READONLY (ref
);
5666 /* TREE_THIS_VOLATILE and TREE_SIDE_EFFECTS attached to the initial
5667 expression may not be sustained across some paths, such as the way via
5668 build1 for INDIRECT_REF. We re-populate those flags here for the general
5669 case, which is consistent with the GCC version of this routine.
5671 Special care should be taken regarding TREE_SIDE_EFFECTS, because some
5672 paths introduce side effects where there was none initially (e.g. calls
5673 to save_expr), and we also want to keep track of that. */
5675 TREE_THIS_VOLATILE (result
) = TREE_THIS_VOLATILE (ref
);
5676 TREE_SIDE_EFFECTS (result
) |= TREE_SIDE_EFFECTS (ref
);
5681 /* Similar to stabilize_reference_1 in tree.c, but supports an extra
5682 arg to force a SAVE_EXPR for everything. */
5685 gnat_stabilize_reference_1 (tree e
, bool force
)
5687 enum tree_code code
= TREE_CODE (e
);
5688 tree type
= TREE_TYPE (e
);
5691 /* We cannot ignore const expressions because it might be a reference
5692 to a const array but whose index contains side-effects. But we can
5693 ignore things that are actual constant or that already have been
5694 handled by this function. */
5696 if (TREE_CONSTANT (e
) || code
== SAVE_EXPR
)
5699 switch (TREE_CODE_CLASS (code
))
5701 case tcc_exceptional
:
5703 case tcc_declaration
:
5704 case tcc_comparison
:
5706 case tcc_expression
:
5708 /* If this is a COMPONENT_REF of a fat pointer, save the entire
5709 fat pointer. This may be more efficient, but will also allow
5710 us to more easily find the match for the PLACEHOLDER_EXPR. */
5711 if (code
== COMPONENT_REF
5712 && TYPE_FAT_POINTER_P (TREE_TYPE (TREE_OPERAND (e
, 0))))
5713 result
= build3 (COMPONENT_REF
, type
,
5714 gnat_stabilize_reference_1 (TREE_OPERAND (e
, 0),
5716 TREE_OPERAND (e
, 1), TREE_OPERAND (e
, 2));
5717 else if (TREE_SIDE_EFFECTS (e
) || force
)
5718 return save_expr (e
);
5724 /* Constants need no processing. In fact, we should never reach
5729 /* Recursively stabilize each operand. */
5730 result
= build2 (code
, type
,
5731 gnat_stabilize_reference_1 (TREE_OPERAND (e
, 0), force
),
5732 gnat_stabilize_reference_1 (TREE_OPERAND (e
, 1),
5737 /* Recursively stabilize each operand. */
5738 result
= build1 (code
, type
,
5739 gnat_stabilize_reference_1 (TREE_OPERAND (e
, 0),
5747 TREE_READONLY (result
) = TREE_READONLY (e
);
5749 TREE_THIS_VOLATILE (result
) = TREE_THIS_VOLATILE (e
);
5750 TREE_SIDE_EFFECTS (result
) |= TREE_SIDE_EFFECTS (e
);
5754 extern char *__gnat_to_canonical_file_spec (char *);
5756 /* Convert Sloc into *LOCUS (a location_t). Return true if this Sloc
5757 corresponds to a source code location and false if it doesn't. In the
5758 latter case, we don't update *LOCUS. We also set the Gigi global variable
5759 REF_FILENAME to the reference file name as given by sinput (i.e no
5763 Sloc_to_locus (Source_Ptr Sloc
, location_t
*locus
)
5765 /* If node not from source code, ignore. */
5769 /* Use the identifier table to make a hashed, permanent copy of the filename,
5770 since the name table gets reallocated after Gigi returns but before all
5771 the debugging information is output. The __gnat_to_canonical_file_spec
5772 call translates filenames from pragmas Source_Reference that contain host
5773 style syntax not understood by gdb. */
5775 = IDENTIFIER_POINTER
5777 (__gnat_to_canonical_file_spec
5778 (Get_Name_String (Full_Debug_Name (Get_Source_File_Index (Sloc
))))));
5780 locus
->line
= Get_Logical_Line_Number (Sloc
);
5783 = IDENTIFIER_POINTER
5785 (Get_Name_String (Debug_Source_Name (Get_Source_File_Index (Sloc
)))));;
5790 /* Similar to annotate_with_locus, but start with the Sloc of GNAT_NODE and
5791 don't do anything if it doesn't correspond to a source location. */
5794 annotate_with_node (tree node
, Node_Id gnat_node
)
5798 if (!Sloc_to_locus (Sloc (gnat_node
), &locus
))
5801 annotate_with_locus (node
, locus
);
5804 /* Post an error message. MSG is the error message, properly annotated.
5805 NODE is the node at which to post the error and the node to use for the
5806 "&" substitution. */
5809 post_error (const char *msg
, Node_Id node
)
5811 String_Template temp
;
5814 temp
.Low_Bound
= 1, temp
.High_Bound
= strlen (msg
);
5815 fp
.Array
= msg
, fp
.Bounds
= &temp
;
5817 Error_Msg_N (fp
, node
);
5820 /* Similar, but NODE is the node at which to post the error and ENT
5821 is the node to use for the "&" substitution. */
5824 post_error_ne (const char *msg
, Node_Id node
, Entity_Id ent
)
5826 String_Template temp
;
5829 temp
.Low_Bound
= 1, temp
.High_Bound
= strlen (msg
);
5830 fp
.Array
= msg
, fp
.Bounds
= &temp
;
5832 Error_Msg_NE (fp
, node
, ent
);
5835 /* Similar, but NODE is the node at which to post the error, ENT is the node
5836 to use for the "&" substitution, and N is the number to use for the ^. */
5839 post_error_ne_num (const char *msg
, Node_Id node
, Entity_Id ent
, int n
)
5841 String_Template temp
;
5844 temp
.Low_Bound
= 1, temp
.High_Bound
= strlen (msg
);
5845 fp
.Array
= msg
, fp
.Bounds
= &temp
;
5846 Error_Msg_Uint_1
= UI_From_Int (n
);
5849 Error_Msg_NE (fp
, node
, ent
);
5852 /* Similar to post_error_ne_num, but T is a GCC tree representing the
5853 number to write. If the tree represents a constant that fits within
5854 a host integer, the text inside curly brackets in MSG will be output
5855 (presumably including a '^'). Otherwise that text will not be output
5856 and the text inside square brackets will be output instead. */
5859 post_error_ne_tree (const char *msg
, Node_Id node
, Entity_Id ent
, tree t
)
5861 char *newmsg
= alloca (strlen (msg
) + 1);
5862 String_Template temp
= {1, 0};
5864 char start_yes
, end_yes
, start_no
, end_no
;
5868 fp
.Array
= newmsg
, fp
.Bounds
= &temp
;
5870 if (host_integerp (t
, 1)
5871 #if HOST_BITS_PER_WIDE_INT > HOST_BITS_PER_INT
5874 (t
, (((unsigned HOST_WIDE_INT
) 1 << (HOST_BITS_PER_INT
- 1)) - 1)) < 0
5878 Error_Msg_Uint_1
= UI_From_Int (tree_low_cst (t
, 1));
5879 start_yes
= '{', end_yes
= '}', start_no
= '[', end_no
= ']';
5882 start_yes
= '[', end_yes
= ']', start_no
= '{', end_no
= '}';
5884 for (p
= msg
, q
= newmsg
; *p
; p
++)
5886 if (*p
== start_yes
)
5887 for (p
++; *p
!= end_yes
; p
++)
5889 else if (*p
== start_no
)
5890 for (p
++; *p
!= end_no
; p
++)
5898 temp
.High_Bound
= strlen (newmsg
);
5900 Error_Msg_NE (fp
, node
, ent
);
5903 /* Similar to post_error_ne_tree, except that NUM is a second
5904 integer to write in the message. */
5907 post_error_ne_tree_2 (const char *msg
,
5913 Error_Msg_Uint_2
= UI_From_Int (num
);
5914 post_error_ne_tree (msg
, node
, ent
, t
);
5917 /* Set the node for a second '&' in the error message. */
5920 set_second_error_entity (Entity_Id e
)
5922 Error_Msg_Node_2
= e
;
5925 /* Initialize the table that maps GNAT codes to GCC codes for simple
5926 binary and unary operations. */
5929 init_code_table (void)
5931 gnu_codes
[N_And_Then
] = TRUTH_ANDIF_EXPR
;
5932 gnu_codes
[N_Or_Else
] = TRUTH_ORIF_EXPR
;
5934 gnu_codes
[N_Op_And
] = TRUTH_AND_EXPR
;
5935 gnu_codes
[N_Op_Or
] = TRUTH_OR_EXPR
;
5936 gnu_codes
[N_Op_Xor
] = TRUTH_XOR_EXPR
;
5937 gnu_codes
[N_Op_Eq
] = EQ_EXPR
;
5938 gnu_codes
[N_Op_Ne
] = NE_EXPR
;
5939 gnu_codes
[N_Op_Lt
] = LT_EXPR
;
5940 gnu_codes
[N_Op_Le
] = LE_EXPR
;
5941 gnu_codes
[N_Op_Gt
] = GT_EXPR
;
5942 gnu_codes
[N_Op_Ge
] = GE_EXPR
;
5943 gnu_codes
[N_Op_Add
] = PLUS_EXPR
;
5944 gnu_codes
[N_Op_Subtract
] = MINUS_EXPR
;
5945 gnu_codes
[N_Op_Multiply
] = MULT_EXPR
;
5946 gnu_codes
[N_Op_Mod
] = FLOOR_MOD_EXPR
;
5947 gnu_codes
[N_Op_Rem
] = TRUNC_MOD_EXPR
;
5948 gnu_codes
[N_Op_Minus
] = NEGATE_EXPR
;
5949 gnu_codes
[N_Op_Abs
] = ABS_EXPR
;
5950 gnu_codes
[N_Op_Not
] = TRUTH_NOT_EXPR
;
5951 gnu_codes
[N_Op_Rotate_Left
] = LROTATE_EXPR
;
5952 gnu_codes
[N_Op_Rotate_Right
] = RROTATE_EXPR
;
5953 gnu_codes
[N_Op_Shift_Left
] = LSHIFT_EXPR
;
5954 gnu_codes
[N_Op_Shift_Right
] = RSHIFT_EXPR
;
5955 gnu_codes
[N_Op_Shift_Right_Arithmetic
] = RSHIFT_EXPR
;
5958 #include "gt-ada-trans.h"