1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987-2014 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
21 /* This file handles generation of all the assembler code
22 *except* the instructions of a function.
23 This includes declarations of variables and their initial values.
25 We also output the assembler code for constants stored in memory
26 and are responsible for combining constants with the same value. */
30 #include "coretypes.h"
34 #include "stor-layout.h"
35 #include "stringpool.h"
36 #include "gcc-symtab.h"
41 #include "hard-reg-set.h"
44 #include "diagnostic-core.h"
47 #include "langhooks.h"
51 #include "common/common-target.h"
52 #include "targhooks.h"
54 #include "pointer-set.h"
56 #include "basic-block.h"
58 #ifdef XCOFF_DEBUGGING_INFO
59 #include "xcoffout.h" /* Needed for external data
60 declarations for e.g. AIX 4.x. */
63 /* The (assembler) name of the first globally-visible object output. */
64 extern GTY(()) const char *first_global_object_name
;
65 extern GTY(()) const char *weak_global_object_name
;
67 const char *first_global_object_name
;
68 const char *weak_global_object_name
;
71 struct constant_descriptor_rtx
;
72 struct rtx_constant_pool
;
74 #define n_deferred_constants (crtl->varasm.deferred_constants)
76 /* Number for making the label on the next
77 constant that is stored in memory. */
79 static GTY(()) int const_labelno
;
81 /* Carry information from ASM_DECLARE_OBJECT_NAME
82 to ASM_FINISH_DECLARE_OBJECT. */
84 int size_directive_output
;
86 /* The last decl for which assemble_variable was called,
87 if it did ASM_DECLARE_OBJECT_NAME.
88 If the last call to assemble_variable didn't do that,
91 tree last_assemble_variable_decl
;
93 /* The following global variable indicates if the first basic block
94 in a function belongs to the cold partition or not. */
96 bool first_function_block_is_cold
;
98 /* We give all constants their own alias set. Perhaps redundant with
99 MEM_READONLY_P, but pre-dates it. */
101 static alias_set_type const_alias_set
;
103 /* Whether we saw any functions with no_split_stack. */
105 static bool saw_no_split_stack
;
107 static const char *strip_reg_name (const char *);
108 static int contains_pointers_p (tree
);
109 #ifdef ASM_OUTPUT_EXTERNAL
110 static bool incorporeal_function_p (tree
);
112 static void decode_addr_const (tree
, struct addr_const
*);
113 static hashval_t
const_desc_hash (const void *);
114 static int const_desc_eq (const void *, const void *);
115 static hashval_t
const_hash_1 (const tree
);
116 static int compare_constant (const tree
, const tree
);
117 static void output_constant_def_contents (rtx
);
118 static void output_addressed_constants (tree
);
119 static unsigned HOST_WIDE_INT
output_constant (tree
, unsigned HOST_WIDE_INT
,
121 static void globalize_decl (tree
);
122 static bool decl_readonly_section_1 (enum section_category
);
123 #ifdef BSS_SECTION_ASM_OP
124 #ifdef ASM_OUTPUT_ALIGNED_BSS
125 static void asm_output_aligned_bss (FILE *, tree
, const char *,
126 unsigned HOST_WIDE_INT
, int)
129 #endif /* BSS_SECTION_ASM_OP */
130 static void mark_weak (tree
);
131 static void output_constant_pool (const char *, tree
);
133 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
134 section
*text_section
;
135 section
*data_section
;
136 section
*readonly_data_section
;
137 section
*sdata_section
;
138 section
*ctors_section
;
139 section
*dtors_section
;
140 section
*bss_section
;
141 section
*sbss_section
;
143 /* Various forms of common section. All are guaranteed to be nonnull. */
144 section
*tls_comm_section
;
145 section
*comm_section
;
146 section
*lcomm_section
;
148 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
150 section
*bss_noswitch_section
;
152 /* The section that holds the main exception table, when known. The section
153 is set either by the target's init_sections hook or by the first call to
154 switch_to_exception_section. */
155 section
*exception_section
;
157 /* The section that holds the DWARF2 frame unwind information, when known.
158 The section is set either by the target's init_sections hook or by the
159 first call to switch_to_eh_frame_section. */
160 section
*eh_frame_section
;
162 /* asm_out_file's current section. This is NULL if no section has yet
163 been selected or if we lose track of what the current section is. */
166 /* True if code for the current function is currently being directed
167 at the cold section. */
168 bool in_cold_section_p
;
170 /* A linked list of all the unnamed sections. */
171 static GTY(()) section
*unnamed_sections
;
173 /* Return a nonzero value if DECL has a section attribute. */
174 #define IN_NAMED_SECTION(DECL) \
175 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
176 && DECL_SECTION_NAME (DECL) != NULL_TREE)
178 /* Hash table of named sections. */
179 static GTY((param_is (section
))) htab_t section_htab
;
181 /* A table of object_blocks, indexed by section. */
182 static GTY((param_is (struct object_block
))) htab_t object_block_htab
;
184 /* The next number to use for internal anchor labels. */
185 static GTY(()) int anchor_labelno
;
187 /* A pool of constants that can be shared between functions. */
188 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
190 /* Helper routines for maintaining section_htab. */
193 section_entry_eq (const void *p1
, const void *p2
)
195 const section
*old
= (const section
*) p1
;
196 const char *new_name
= (const char *) p2
;
198 return strcmp (old
->named
.name
, new_name
) == 0;
202 section_entry_hash (const void *p
)
204 const section
*old
= (const section
*) p
;
205 return htab_hash_string (old
->named
.name
);
208 /* Return a hash value for section SECT. */
211 hash_section (section
*sect
)
213 if (sect
->common
.flags
& SECTION_NAMED
)
214 return htab_hash_string (sect
->named
.name
);
215 return sect
->common
.flags
;
218 /* Helper routines for maintaining object_block_htab. */
221 object_block_entry_eq (const void *p1
, const void *p2
)
223 const struct object_block
*old
= (const struct object_block
*) p1
;
224 const section
*new_section
= (const section
*) p2
;
226 return old
->sect
== new_section
;
230 object_block_entry_hash (const void *p
)
232 const struct object_block
*old
= (const struct object_block
*) p
;
233 return hash_section (old
->sect
);
236 /* Return a new unnamed section with the given fields. */
239 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
244 sect
= ggc_alloc
<section
> ();
245 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
246 sect
->unnamed
.callback
= callback
;
247 sect
->unnamed
.data
= data
;
248 sect
->unnamed
.next
= unnamed_sections
;
250 unnamed_sections
= sect
;
254 /* Return a SECTION_NOSWITCH section with the given fields. */
257 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
261 sect
= ggc_alloc
<section
> ();
262 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
263 sect
->noswitch
.callback
= callback
;
268 /* Return the named section structure associated with NAME. Create
269 a new section with the given fields if no such structure exists. */
272 get_section (const char *name
, unsigned int flags
, tree decl
)
274 section
*sect
, **slot
;
277 htab_find_slot_with_hash (section_htab
, name
,
278 htab_hash_string (name
), INSERT
);
279 flags
|= SECTION_NAMED
;
282 sect
= ggc_alloc
<section
> ();
283 sect
->named
.common
.flags
= flags
;
284 sect
->named
.name
= ggc_strdup (name
);
285 sect
->named
.decl
= decl
;
291 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
292 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
294 /* It is fine if one of the section flags is
295 SECTION_WRITE | SECTION_RELRO and the other has none of these
296 flags (i.e. read-only) in named sections and either the
297 section hasn't been declared yet or has been declared as writable.
298 In that case just make sure the resulting flags are
299 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
301 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
302 == (SECTION_WRITE
| SECTION_RELRO
)
303 && (sect
->common
.flags
304 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
305 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
306 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
307 || (sect
->common
.flags
& SECTION_WRITE
)))
309 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
312 /* Sanity check user variables for flag changes. */
313 if (sect
->named
.decl
!= NULL
314 && DECL_P (sect
->named
.decl
)
315 && decl
!= sect
->named
.decl
)
317 if (decl
!= NULL
&& DECL_P (decl
))
318 error ("%+D causes a section type conflict with %D",
319 decl
, sect
->named
.decl
);
321 error ("section type conflict with %D", sect
->named
.decl
);
322 inform (DECL_SOURCE_LOCATION (sect
->named
.decl
),
323 "%qD was declared here", sect
->named
.decl
);
325 else if (decl
!= NULL
&& DECL_P (decl
))
326 error ("%+D causes a section type conflict", decl
);
328 error ("section type conflict");
329 /* Make sure we don't error about one section multiple times. */
330 sect
->common
.flags
|= SECTION_OVERRIDE
;
336 /* Return true if the current compilation mode benefits from having
337 objects grouped into blocks. */
340 use_object_blocks_p (void)
342 return flag_section_anchors
;
345 /* Return the object_block structure for section SECT. Create a new
346 structure if we haven't created one already. Return null if SECT
349 static struct object_block
*
350 get_block_for_section (section
*sect
)
352 struct object_block
*block
;
358 slot
= htab_find_slot_with_hash (object_block_htab
, sect
,
359 hash_section (sect
), INSERT
);
360 block
= (struct object_block
*) *slot
;
363 block
= ggc_cleared_alloc
<object_block
> ();
370 /* Create a symbol with label LABEL and place it at byte offset
371 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
372 is not yet known. LABEL must be a garbage-collected string. */
375 create_block_symbol (const char *label
, struct object_block
*block
,
376 HOST_WIDE_INT offset
)
381 /* Create the extended SYMBOL_REF. */
382 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
383 symbol
= (rtx
) ggc_internal_alloc (size
);
385 /* Initialize the normal SYMBOL_REF fields. */
386 memset (symbol
, 0, size
);
387 PUT_CODE (symbol
, SYMBOL_REF
);
388 PUT_MODE (symbol
, Pmode
);
389 XSTR (symbol
, 0) = label
;
390 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
392 /* Initialize the block_symbol stuff. */
393 SYMBOL_REF_BLOCK (symbol
) = block
;
394 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
399 /* Return a section with a particular name and with whatever SECTION_*
400 flags section_type_flags deems appropriate. The name of the section
401 is taken from NAME if nonnull, otherwise it is taken from DECL's
402 DECL_SECTION_NAME. DECL is the decl associated with the section
403 (see the section comment for details) and RELOC is as for
404 section_type_flags. */
407 get_named_section (tree decl
, const char *name
, int reloc
)
413 gcc_assert (decl
&& DECL_P (decl
) && DECL_SECTION_NAME (decl
));
414 name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
417 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
418 return get_section (name
, flags
, decl
);
421 /* If required, set DECL_SECTION_NAME to a unique name. */
424 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
425 int flag_function_or_data_sections
)
427 if (DECL_SECTION_NAME (decl
) == NULL_TREE
428 && targetm_common
.have_named_sections
429 && (flag_function_or_data_sections
430 || DECL_COMDAT_GROUP (decl
)))
432 targetm
.asm_out
.unique_section (decl
, reloc
);
433 DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
) = true;
437 #ifdef BSS_SECTION_ASM_OP
439 #ifdef ASM_OUTPUT_ALIGNED_BSS
441 /* Utility function for targets to use in implementing
442 ASM_OUTPUT_ALIGNED_BSS.
443 ??? It is believed that this function will work in most cases so such
444 support is localized here. */
447 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
448 const char *name
, unsigned HOST_WIDE_INT size
,
451 switch_to_section (bss_section
);
452 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
453 #ifdef ASM_DECLARE_OBJECT_NAME
454 last_assemble_variable_decl
= decl
;
455 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
457 /* Standard thing is just output label for the object. */
458 ASM_OUTPUT_LABEL (file
, name
);
459 #endif /* ASM_DECLARE_OBJECT_NAME */
460 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
465 #endif /* BSS_SECTION_ASM_OP */
467 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
468 /* Return the hot section for function DECL. Return text_section for
472 hot_function_section (tree decl
)
474 if (decl
!= NULL_TREE
475 && DECL_SECTION_NAME (decl
) != NULL_TREE
476 && targetm_common
.have_named_sections
)
477 return get_named_section (decl
, NULL
, 0);
483 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
486 When DECL_SECTION_NAME is non-NULL and it is implicit section and
487 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
488 concatenate the name with NAMED_SECTION_SUFFIX.
489 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
492 get_named_text_section (tree decl
,
493 const char *text_section_name
,
494 const char *named_section_suffix
)
496 if (decl
&& DECL_SECTION_NAME (decl
))
498 if (named_section_suffix
)
500 tree dsn
= DECL_SECTION_NAME (decl
);
501 const char *stripped_name
;
504 name
= (char *) alloca (TREE_STRING_LENGTH (dsn
) + 1);
505 memcpy (name
, TREE_STRING_POINTER (dsn
),
506 TREE_STRING_LENGTH (dsn
) + 1);
508 stripped_name
= targetm
.strip_name_encoding (name
);
510 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
511 return get_named_section (decl
, buffer
, 0);
513 else if (DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
))
517 /* Do not try to split gnu_linkonce functions. This gets somewhat
519 if (DECL_COMDAT_GROUP (decl
) && !HAVE_COMDAT_GROUP
)
521 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
522 name
= targetm
.strip_name_encoding (name
);
523 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
529 return get_named_section (decl
, text_section_name
, 0);
532 /* Choose named function section based on its frequency. */
535 default_function_section (tree decl
, enum node_frequency freq
,
536 bool startup
, bool exit
)
538 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
539 /* Old GNU linkers have buggy --gc-section support, which sometimes
540 results in .gcc_except_table* sections being garbage collected. */
542 && DECL_SECTION_NAME (decl
)
543 && DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
))
547 if (!flag_reorder_functions
548 || !targetm_common
.have_named_sections
)
550 /* Startup code should go to startup subsection unless it is
551 unlikely executed (this happens especially with function splitting
552 where we can split away unnecessary parts of static constructors. */
553 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
555 /* If we do have a profile or(and) LTO phase is executed, we do not need
556 these ELF section. */
557 if (!in_lto_p
|| !flag_profile_values
)
558 return get_named_text_section (decl
, ".text.startup", NULL
);
563 /* Similarly for exit. */
564 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
565 return get_named_text_section (decl
, ".text.exit", NULL
);
567 /* Group cold functions together, similarly for hot code. */
570 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
571 return get_named_text_section (decl
, ".text.unlikely", NULL
);
572 case NODE_FREQUENCY_HOT
:
573 /* If we do have a profile or(and) LTO phase is executed, we do not need
574 these ELF section. */
575 if (!in_lto_p
|| !flag_profile_values
)
576 return get_named_text_section (decl
, ".text.hot", NULL
);
582 /* Return the section for function DECL.
584 If DECL is NULL_TREE, return the text section. We can be passed
585 NULL_TREE under some circumstances by dbxout.c at least.
587 If FORCE_COLD is true, return cold function section ignoring
588 the frequency info of cgraph_node. */
591 function_section_1 (tree decl
, bool force_cold
)
593 section
*section
= NULL
;
594 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
595 bool startup
= false, exit
= false;
599 struct cgraph_node
*node
= cgraph_get_node (decl
);
603 freq
= node
->frequency
;
604 startup
= node
->only_called_at_startup
;
605 exit
= node
->only_called_at_exit
;
609 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
611 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
612 if (decl
!= NULL_TREE
613 && DECL_SECTION_NAME (decl
) != NULL_TREE
)
615 if (targetm
.asm_out
.function_section
)
616 section
= targetm
.asm_out
.function_section (decl
, freq
,
620 return get_named_section (decl
, NULL
, 0);
623 return targetm
.asm_out
.select_section
624 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
627 if (targetm
.asm_out
.function_section
)
628 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
631 return hot_function_section (decl
);
635 /* Return the section for function DECL.
637 If DECL is NULL_TREE, return the text section. We can be passed
638 NULL_TREE under some circumstances by dbxout.c at least. */
641 function_section (tree decl
)
643 /* Handle cases where function splitting code decides
644 to put function entry point into unlikely executed section
645 despite the fact that the function itself is not cold
646 (i.e. it is called rarely but contains a hot loop that is
647 better to live in hot subsection for the code locality). */
648 return function_section_1 (decl
,
649 first_function_block_is_cold
);
652 /* Return the section for the current function, take IN_COLD_SECTION_P
656 current_function_section (void)
658 return function_section_1 (current_function_decl
, in_cold_section_p
);
661 /* Tell assembler to switch to unlikely-to-be-executed text section. */
664 unlikely_text_section (void)
666 return function_section_1 (current_function_decl
, true);
669 /* When called within a function context, return true if the function
670 has been assigned a cold text section and if SECT is that section.
671 When called outside a function context, return true if SECT is the
672 default cold section. */
675 unlikely_text_section_p (section
*sect
)
677 return sect
== function_section_1 (current_function_decl
, true);
680 /* Return the read-only data section associated with function DECL. */
683 default_function_rodata_section (tree decl
)
685 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
687 const char *name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
689 if (DECL_COMDAT_GROUP (decl
) && HAVE_COMDAT_GROUP
)
695 dot
= strchr (name
+ 1, '.');
698 len
= strlen (dot
) + 8;
699 rname
= (char *) alloca (len
);
701 strcpy (rname
, ".rodata");
703 return get_section (rname
, SECTION_LINKONCE
, decl
);
705 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
706 else if (DECL_COMDAT_GROUP (decl
)
707 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
709 size_t len
= strlen (name
) + 1;
710 char *rname
= (char *) alloca (len
);
712 memcpy (rname
, name
, len
);
714 return get_section (rname
, SECTION_LINKONCE
, decl
);
716 /* For .text.foo we want to use .rodata.foo. */
717 else if (flag_function_sections
&& flag_data_sections
718 && strncmp (name
, ".text.", 6) == 0)
720 size_t len
= strlen (name
) + 1;
721 char *rname
= (char *) alloca (len
+ 2);
723 memcpy (rname
, ".rodata", 7);
724 memcpy (rname
+ 7, name
+ 5, len
- 5);
725 return get_section (rname
, 0, decl
);
729 return readonly_data_section
;
732 /* Return the read-only data section associated with function DECL
733 for targets where that section should be always the single
734 readonly data section. */
737 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
739 return readonly_data_section
;
742 /* Return the section to use for string merging. */
745 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
746 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
747 unsigned int flags ATTRIBUTE_UNUSED
)
751 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
752 && TREE_CODE (decl
) == STRING_CST
753 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
755 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
756 && TREE_STRING_LENGTH (decl
) >= len
)
758 enum machine_mode mode
;
759 unsigned int modesize
;
763 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
764 char *name
= (char *) alloca (strlen (prefix
) + 30);
766 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
767 modesize
= GET_MODE_BITSIZE (mode
);
768 if (modesize
>= 8 && modesize
<= 256
769 && (modesize
& (modesize
- 1)) == 0)
771 if (align
< modesize
)
774 str
= TREE_STRING_POINTER (decl
);
775 unit
= GET_MODE_SIZE (mode
);
777 /* Check for embedded NUL characters. */
778 for (i
= 0; i
< len
; i
+= unit
)
780 for (j
= 0; j
< unit
; j
++)
781 if (str
[i
+ j
] != '\0')
788 sprintf (name
, "%s.str%d.%d", prefix
,
789 modesize
/ 8, (int) (align
/ 8));
790 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
791 return get_section (name
, flags
, NULL
);
796 return readonly_data_section
;
799 /* Return the section to use for constant merging. */
802 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
803 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
804 unsigned int flags ATTRIBUTE_UNUSED
)
806 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
808 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
814 && (align
& (align
- 1)) == 0)
816 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
817 char *name
= (char *) alloca (strlen (prefix
) + 30);
819 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
820 flags
|= (align
/ 8) | SECTION_MERGE
;
821 return get_section (name
, flags
, NULL
);
823 return readonly_data_section
;
826 /* Given NAME, a putative register name, discard any customary prefixes. */
829 strip_reg_name (const char *name
)
831 #ifdef REGISTER_PREFIX
832 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
833 name
+= strlen (REGISTER_PREFIX
);
835 if (name
[0] == '%' || name
[0] == '#')
840 /* The user has asked for a DECL to have a particular name. Set (or
841 change) it in such a way that we don't prefix an underscore to
844 set_user_assembler_name (tree decl
, const char *name
)
846 char *starred
= (char *) alloca (strlen (name
) + 2);
848 strcpy (starred
+ 1, name
);
849 change_decl_assembler_name (decl
, get_identifier (starred
));
850 SET_DECL_RTL (decl
, NULL_RTX
);
853 /* Decode an `asm' spec for a declaration as a register name.
854 Return the register number, or -1 if nothing specified,
855 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
856 or -3 if ASMSPEC is `cc' and is not recognized,
857 or -4 if ASMSPEC is `memory' and is not recognized.
858 Accept an exact spelling or a decimal number.
859 Prefixes such as % are optional. */
862 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
864 /* Presume just one register is clobbered. */
871 /* Get rid of confusing prefixes. */
872 asmspec
= strip_reg_name (asmspec
);
874 /* Allow a decimal number as a "register name". */
875 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
876 if (! ISDIGIT (asmspec
[i
]))
878 if (asmspec
[0] != 0 && i
< 0)
881 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0)
887 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
889 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
892 #ifdef OVERLAPPING_REGISTER_NAMES
896 const char *const name
;
899 } table
[] = OVERLAPPING_REGISTER_NAMES
;
901 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
903 && ! strcmp (asmspec
, table
[i
].name
))
905 *pnregs
= table
[i
].nregs
;
906 return table
[i
].number
;
909 #endif /* OVERLAPPING_REGISTER_NAMES */
911 #ifdef ADDITIONAL_REGISTER_NAMES
913 static const struct { const char *const name
; const int number
; } table
[]
914 = ADDITIONAL_REGISTER_NAMES
;
916 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
918 && ! strcmp (asmspec
, table
[i
].name
))
919 return table
[i
].number
;
921 #endif /* ADDITIONAL_REGISTER_NAMES */
923 if (!strcmp (asmspec
, "memory"))
926 if (!strcmp (asmspec
, "cc"))
936 decode_reg_name (const char *name
)
939 return decode_reg_name_and_count (name
, &count
);
943 /* Return true if DECL's initializer is suitable for a BSS section. */
946 bss_initializer_p (const_tree decl
)
948 return (DECL_INITIAL (decl
) == NULL
949 || DECL_INITIAL (decl
) == error_mark_node
950 || (flag_zero_initialized_in_bss
951 /* Leave constant zeroes in .rodata so they
953 && !TREE_READONLY (decl
)
954 && initializer_zerop (DECL_INITIAL (decl
))));
957 /* Compute the alignment of variable specified by DECL.
958 DONT_OUTPUT_DATA is from assemble_variable. */
961 align_variable (tree decl
, bool dont_output_data
)
963 unsigned int align
= DECL_ALIGN (decl
);
965 /* In the case for initialing an array whose length isn't specified,
966 where we have not yet been able to do the layout,
967 figure out the proper alignment now. */
968 if (dont_output_data
&& DECL_SIZE (decl
) == 0
969 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
970 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
972 /* Some object file formats have a maximum alignment which they support.
973 In particular, a.out format supports a maximum alignment of 4. */
974 if (align
> MAX_OFILE_ALIGNMENT
)
976 error ("alignment of %q+D is greater than maximum object "
977 "file alignment %d", decl
,
978 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
979 align
= MAX_OFILE_ALIGNMENT
;
982 if (! DECL_USER_ALIGN (decl
))
984 #ifdef DATA_ABI_ALIGNMENT
985 unsigned int data_abi_align
986 = DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
987 /* For backwards compatibility, don't assume the ABI alignment for
989 if (! DECL_THREAD_LOCAL_P (decl
) || data_abi_align
<= BITS_PER_WORD
)
990 align
= data_abi_align
;
993 /* On some machines, it is good to increase alignment sometimes.
994 But as DECL_ALIGN is used both for actually emitting the variable
995 and for code accessing the variable as guaranteed alignment, we
996 can only increase the alignment if it is a performance optimization
997 if the references to it must bind to the current definition. */
998 if (decl_binds_to_current_def_p (decl
)
999 && !DECL_VIRTUAL_P (decl
))
1001 #ifdef DATA_ALIGNMENT
1002 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1003 /* Don't increase alignment too much for TLS variables - TLS space
1005 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1008 #ifdef CONSTANT_ALIGNMENT
1009 if (DECL_INITIAL (decl
) != 0
1010 && DECL_INITIAL (decl
) != error_mark_node
)
1012 unsigned int const_align
1013 = CONSTANT_ALIGNMENT (DECL_INITIAL (decl
), align
);
1014 /* Don't increase alignment too much for TLS variables - TLS
1015 space is too precious. */
1016 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1017 align
= const_align
;
1023 /* Reset the alignment in case we have made it tighter, so we can benefit
1024 from it in get_pointer_alignment. */
1025 DECL_ALIGN (decl
) = align
;
1028 /* Return DECL_ALIGN (decl), possibly increased for optimization purposes
1029 beyond what align_variable returned. */
1032 get_variable_align (tree decl
)
1034 unsigned int align
= DECL_ALIGN (decl
);
1036 /* For user aligned vars or static vars align_variable already did
1038 if (DECL_USER_ALIGN (decl
) || !TREE_PUBLIC (decl
))
1041 #ifdef DATA_ABI_ALIGNMENT
1042 if (DECL_THREAD_LOCAL_P (decl
))
1043 align
= DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1046 /* For decls that bind to the current definition, align_variable
1047 did also everything, except for not assuming ABI required alignment
1048 of TLS variables. For other vars, increase the alignment here
1049 as an optimization. */
1050 if (!decl_binds_to_current_def_p (decl
))
1052 /* On some machines, it is good to increase alignment sometimes. */
1053 #ifdef DATA_ALIGNMENT
1054 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1055 /* Don't increase alignment too much for TLS variables - TLS space
1057 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1060 #ifdef CONSTANT_ALIGNMENT
1061 if (DECL_INITIAL (decl
) != 0 && DECL_INITIAL (decl
) != error_mark_node
)
1063 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
1065 /* Don't increase alignment too much for TLS variables - TLS space
1067 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1068 align
= const_align
;
1076 /* Return the section into which the given VAR_DECL or CONST_DECL
1077 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1078 section should be used wherever possible. */
1081 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1083 addr_space_t as
= ADDR_SPACE_GENERIC
;
1085 symtab_node
*snode
= symtab_get_node (decl
);
1087 decl
= symtab_alias_ultimate_target (snode
)->decl
;
1089 if (TREE_TYPE (decl
) != error_mark_node
)
1090 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1092 if (DECL_COMMON (decl
))
1094 /* If the decl has been given an explicit section name, or it resides
1095 in a non-generic address space, then it isn't common, and shouldn't
1096 be handled as such. */
1097 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1098 && ADDR_SPACE_GENERIC_P (as
));
1099 if (DECL_THREAD_LOCAL_P (decl
))
1100 return tls_comm_section
;
1101 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1102 return comm_section
;
1105 if (DECL_INITIAL (decl
) == error_mark_node
)
1106 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1107 else if (DECL_INITIAL (decl
))
1108 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1112 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1113 if (IN_NAMED_SECTION (decl
))
1114 return get_named_section (decl
, NULL
, reloc
);
1116 if (ADDR_SPACE_GENERIC_P (as
)
1117 && !DECL_THREAD_LOCAL_P (decl
)
1118 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1119 && bss_initializer_p (decl
))
1121 if (!TREE_PUBLIC (decl
)
1122 && !((flag_sanitize
& SANITIZE_ADDRESS
)
1123 && asan_protect_global (decl
)))
1124 return lcomm_section
;
1125 if (bss_noswitch_section
)
1126 return bss_noswitch_section
;
1129 return targetm
.asm_out
.select_section (decl
, reloc
,
1130 get_variable_align (decl
));
1133 /* Return the block into which object_block DECL should be placed. */
1135 static struct object_block
*
1136 get_block_for_decl (tree decl
)
1140 if (TREE_CODE (decl
) == VAR_DECL
)
1142 /* The object must be defined in this translation unit. */
1143 if (DECL_EXTERNAL (decl
))
1146 /* There's no point using object blocks for something that is
1147 isolated by definition. */
1148 if (DECL_COMDAT_GROUP (decl
))
1152 /* We can only calculate block offsets if the decl has a known
1154 if (DECL_SIZE_UNIT (decl
) == NULL
)
1156 if (!tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
)))
1159 /* Find out which section should contain DECL. We cannot put it into
1160 an object block if it requires a standalone definition. */
1161 if (TREE_CODE (decl
) == VAR_DECL
)
1162 align_variable (decl
, 0);
1163 sect
= get_variable_section (decl
, true);
1164 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1167 return get_block_for_section (sect
);
1170 /* Make sure block symbol SYMBOL is in block BLOCK. */
1173 change_symbol_block (rtx symbol
, struct object_block
*block
)
1175 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1177 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1178 SYMBOL_REF_BLOCK (symbol
) = block
;
1182 /* Return true if it is possible to put DECL in an object_block. */
1185 use_blocks_for_decl_p (tree decl
)
1187 /* Only data DECLs can be placed into object blocks. */
1188 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1191 /* Detect decls created by dw2_force_const_mem. Such decls are
1192 special because DECL_INITIAL doesn't specify the decl's true value.
1193 dw2_output_indirect_constants will instead call assemble_variable
1194 with dont_output_data set to 1 and then print the contents itself. */
1195 if (DECL_INITIAL (decl
) == decl
)
1198 /* If this decl is an alias, then we don't want to emit a
1200 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)))
1203 return targetm
.use_blocks_for_decl_p (decl
);
1206 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1207 have static storage duration. In other words, it should not be an
1208 automatic variable, including PARM_DECLs.
1210 There is, however, one exception: this function handles variables
1211 explicitly placed in a particular register by the user.
1213 This is never called for PARM_DECL nodes. */
1216 make_decl_rtl (tree decl
)
1218 const char *name
= 0;
1222 /* Check that we are not being given an automatic variable. */
1223 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1224 && TREE_CODE (decl
) != RESULT_DECL
);
1226 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1227 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1228 || TREE_STATIC (decl
)
1229 || TREE_PUBLIC (decl
)
1230 || DECL_EXTERNAL (decl
)
1231 || DECL_REGISTER (decl
));
1233 /* And that we were not given a type or a label. */
1234 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1235 && TREE_CODE (decl
) != LABEL_DECL
);
1237 /* For a duplicate declaration, we can be called twice on the
1238 same DECL node. Don't discard the RTL already made. */
1239 if (DECL_RTL_SET_P (decl
))
1241 /* If the old RTL had the wrong mode, fix the mode. */
1242 x
= DECL_RTL (decl
);
1243 if (GET_MODE (x
) != DECL_MODE (decl
))
1244 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1246 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1249 /* ??? Another way to do this would be to maintain a hashed
1250 table of such critters. Instead of adding stuff to a DECL
1251 to give certain attributes to it, we could use an external
1252 hash map from DECL to set of attributes. */
1254 /* Let the target reassign the RTL if it wants.
1255 This is necessary, for example, when one machine specific
1256 decl attribute overrides another. */
1257 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1259 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1260 on the new decl information. */
1262 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1263 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1264 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1269 /* If this variable belongs to the global constant pool, retrieve the
1270 pre-computed RTL or recompute it in LTO mode. */
1271 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_IN_CONSTANT_POOL (decl
))
1273 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1277 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
1279 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1280 && DECL_REGISTER (decl
))
1282 error ("register name not specified for %q+D", decl
);
1284 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1286 const char *asmspec
= name
+1;
1287 enum machine_mode mode
= DECL_MODE (decl
);
1288 reg_number
= decode_reg_name (asmspec
);
1289 /* First detect errors in declaring global registers. */
1290 if (reg_number
== -1)
1291 error ("register name not specified for %q+D", decl
);
1292 else if (reg_number
< 0)
1293 error ("invalid register name for %q+D", decl
);
1294 else if (mode
== BLKmode
)
1295 error ("data type of %q+D isn%'t suitable for a register",
1297 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1298 error ("the register specified for %q+D cannot be accessed"
1299 " by the current target", decl
);
1300 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1301 error ("the register specified for %q+D is not general enough"
1302 " to be used as a register variable", decl
);
1303 else if (!HARD_REGNO_MODE_OK (reg_number
, mode
))
1304 error ("register specified for %q+D isn%'t suitable for data type",
1306 /* Now handle properly declared static register variables. */
1311 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1313 DECL_INITIAL (decl
) = 0;
1314 error ("global register variable has initial value");
1316 if (TREE_THIS_VOLATILE (decl
))
1317 warning (OPT_Wvolatile_register_var
,
1318 "optimization may eliminate reads and/or "
1319 "writes to register variables");
1321 /* If the user specified one of the eliminables registers here,
1322 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1323 confused with that register and be eliminated. This usage is
1324 somewhat suspect... */
1326 SET_DECL_RTL (decl
, gen_rtx_raw_REG (mode
, reg_number
));
1327 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1328 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1330 if (TREE_STATIC (decl
))
1332 /* Make this register global, so not usable for anything
1334 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1335 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1336 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1338 nregs
= hard_regno_nregs
[reg_number
][mode
];
1340 globalize_reg (decl
, reg_number
+ --nregs
);
1343 /* As a register variable, it has no section. */
1347 /* Now handle ordinary static variables and functions (in memory).
1348 Also handle vars declared register invalidly. */
1349 else if (name
[0] == '*')
1351 #ifdef REGISTER_PREFIX
1352 if (strlen (REGISTER_PREFIX
) != 0)
1354 reg_number
= decode_reg_name (name
);
1355 if (reg_number
>= 0 || reg_number
== -3)
1356 error ("register name given for non-register variable %q+D", decl
);
1361 /* Specifying a section attribute on a variable forces it into a
1362 non-.bss section, and thus it cannot be common. */
1363 /* FIXME: In general this code should not be necessary because
1364 visibility pass is doing the same work. But notice_global_symbol
1365 is called early and it needs to make DECL_RTL to get the name.
1366 we take care of recomputing the DECL_RTL after visibility is changed. */
1367 if (TREE_CODE (decl
) == VAR_DECL
1368 && DECL_SECTION_NAME (decl
) != NULL_TREE
1369 && DECL_INITIAL (decl
) == NULL_TREE
1370 && DECL_COMMON (decl
))
1371 DECL_COMMON (decl
) = 0;
1373 /* Variables can't be both common and weak. */
1374 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1375 DECL_COMMON (decl
) = 0;
1377 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1378 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1381 enum machine_mode address_mode
= Pmode
;
1382 if (TREE_TYPE (decl
) != error_mark_node
)
1384 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1385 address_mode
= targetm
.addr_space
.address_mode (as
);
1387 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1389 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1390 SET_SYMBOL_REF_DECL (x
, decl
);
1392 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1393 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1394 set_mem_attributes (x
, decl
, 1);
1395 SET_DECL_RTL (decl
, x
);
1397 /* Optionally set flags or add text to the name to record information
1398 such as that it is a function name.
1399 If the name is changed, the macro ASM_OUTPUT_LABELREF
1400 will have to know how to strip this information. */
1401 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1404 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1405 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1409 make_decl_rtl_for_debug (tree decl
)
1411 unsigned int save_aliasing_flag
;
1414 if (DECL_RTL_SET_P (decl
))
1415 return DECL_RTL (decl
);
1417 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1418 call new_alias_set. If running with -fcompare-debug, sometimes
1419 we do not want to create alias sets that will throw the alias
1420 numbers off in the comparison dumps. So... clearing
1421 flag_strict_aliasing will keep new_alias_set() from creating a
1423 save_aliasing_flag
= flag_strict_aliasing
;
1424 flag_strict_aliasing
= 0;
1426 rtl
= DECL_RTL (decl
);
1427 /* Reset DECL_RTL back, as various parts of the compiler expects
1428 DECL_RTL set meaning it is actually going to be output. */
1429 SET_DECL_RTL (decl
, NULL
);
1431 flag_strict_aliasing
= save_aliasing_flag
;
1435 /* Output a string of literal assembler code
1436 for an `asm' keyword used between functions. */
1439 assemble_asm (tree string
)
1444 if (TREE_CODE (string
) == ADDR_EXPR
)
1445 string
= TREE_OPERAND (string
, 0);
1447 p
= TREE_STRING_POINTER (string
);
1448 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1451 /* Write the address of the entity given by SYMBOL to SEC. */
1453 assemble_addr_to_section (rtx symbol
, section
*sec
)
1455 switch_to_section (sec
);
1456 assemble_align (POINTER_SIZE
);
1457 assemble_integer (symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1460 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1461 not) section for PRIORITY. */
1463 get_cdtor_priority_section (int priority
, bool constructor_p
)
1467 /* ??? This only works reliably with the GNU linker. */
1468 sprintf (buf
, "%s.%.5u",
1469 constructor_p
? ".ctors" : ".dtors",
1470 /* Invert the numbering so the linker puts us in the proper
1471 order; constructors are run from right to left, and the
1472 linker sorts in increasing order. */
1473 MAX_INIT_PRIORITY
- priority
);
1474 return get_section (buf
, SECTION_WRITE
, NULL
);
1478 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1482 if (priority
!= DEFAULT_INIT_PRIORITY
)
1483 sec
= get_cdtor_priority_section (priority
,
1484 /*constructor_p=*/false);
1486 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1488 assemble_addr_to_section (symbol
, sec
);
1491 #ifdef DTORS_SECTION_ASM_OP
1493 default_dtor_section_asm_out_destructor (rtx symbol
,
1494 int priority ATTRIBUTE_UNUSED
)
1496 assemble_addr_to_section (symbol
, dtors_section
);
1501 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1505 if (priority
!= DEFAULT_INIT_PRIORITY
)
1506 sec
= get_cdtor_priority_section (priority
,
1507 /*constructor_p=*/true);
1509 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1511 assemble_addr_to_section (symbol
, sec
);
1514 #ifdef CTORS_SECTION_ASM_OP
1516 default_ctor_section_asm_out_constructor (rtx symbol
,
1517 int priority ATTRIBUTE_UNUSED
)
1519 assemble_addr_to_section (symbol
, ctors_section
);
1523 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1524 a nonzero value if the constant pool should be output before the
1525 start of the function, or a zero value if the pool should output
1526 after the end of the function. The default is to put it before the
1529 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1530 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1533 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1534 to be output to assembler.
1535 Set first_global_object_name and weak_global_object_name as appropriate. */
1538 notice_global_symbol (tree decl
)
1540 const char **type
= &first_global_object_name
;
1542 if (first_global_object_name
1543 || !TREE_PUBLIC (decl
)
1544 || DECL_EXTERNAL (decl
)
1545 || !DECL_NAME (decl
)
1546 || (TREE_CODE (decl
) != FUNCTION_DECL
1547 && (TREE_CODE (decl
) != VAR_DECL
1548 || (DECL_COMMON (decl
)
1549 && (DECL_INITIAL (decl
) == 0
1550 || DECL_INITIAL (decl
) == error_mark_node
))))
1551 || !MEM_P (DECL_RTL (decl
)))
1554 /* We win when global object is found, but it is useful to know about weak
1555 symbol as well so we can produce nicer unique names. */
1556 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1557 type
= &weak_global_object_name
;
1563 rtx decl_rtl
= DECL_RTL (decl
);
1565 p
= targetm
.strip_name_encoding (XSTR (XEXP (decl_rtl
, 0), 0));
1566 name
= ggc_strdup (p
);
1572 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1573 current function goes into the cold section, so that targets can use
1574 current_function_section during RTL expansion. DECL describes the
1578 decide_function_section (tree decl
)
1580 first_function_block_is_cold
= false;
1582 if (flag_reorder_blocks_and_partition
)
1583 /* We will decide in assemble_start_function. */
1586 if (DECL_SECTION_NAME (decl
))
1588 struct cgraph_node
*node
= cgraph_get_node (current_function_decl
);
1589 /* Calls to function_section rely on first_function_block_is_cold
1591 first_function_block_is_cold
= (node
1593 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1596 in_cold_section_p
= first_function_block_is_cold
;
1599 /* Output assembler code for the constant pool of a function and associated
1600 with defining the name of the function. DECL describes the function.
1601 NAME is the function's name. For the constant pool, we use the current
1602 constant pool data. */
1605 assemble_start_function (tree decl
, const char *fnname
)
1608 char tmp_label
[100];
1609 bool hot_label_written
= false;
1611 if (flag_reorder_blocks_and_partition
)
1613 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1614 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1615 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1616 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1617 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1618 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1619 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1620 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1625 crtl
->subsections
.hot_section_label
= NULL
;
1626 crtl
->subsections
.cold_section_label
= NULL
;
1627 crtl
->subsections
.hot_section_end_label
= NULL
;
1628 crtl
->subsections
.cold_section_end_label
= NULL
;
1631 /* The following code does not need preprocessing in the assembler. */
1635 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1636 output_constant_pool (fnname
, decl
);
1638 /* Make sure the not and cold text (code) sections are properly
1639 aligned. This is necessary here in the case where the function
1640 has both hot and cold sections, because we don't want to re-set
1641 the alignment when the section switch happens mid-function. */
1643 if (flag_reorder_blocks_and_partition
)
1645 first_function_block_is_cold
= false;
1647 switch_to_section (unlikely_text_section ());
1648 assemble_align (DECL_ALIGN (decl
));
1649 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1651 /* When the function starts with a cold section, we need to explicitly
1652 align the hot section and write out the hot section label.
1653 But if the current function is a thunk, we do not have a CFG. */
1655 && BB_PARTITION (ENTRY_BLOCK_PTR_FOR_FN (cfun
)->next_bb
) == BB_COLD_PARTITION
)
1657 switch_to_section (text_section
);
1658 assemble_align (DECL_ALIGN (decl
));
1659 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1660 hot_label_written
= true;
1661 first_function_block_is_cold
= true;
1663 in_cold_section_p
= first_function_block_is_cold
;
1667 /* Switch to the correct text section for the start of the function. */
1669 switch_to_section (function_section (decl
));
1670 if (flag_reorder_blocks_and_partition
1671 && !hot_label_written
)
1672 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1674 /* Tell assembler to move to target machine's alignment for functions. */
1675 align
= floor_log2 (DECL_ALIGN (decl
) / BITS_PER_UNIT
);
1678 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1681 /* Handle a user-specified function alignment.
1682 Note that we still need to align to DECL_ALIGN, as above,
1683 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1684 if (! DECL_USER_ALIGN (decl
)
1685 && align_functions_log
> align
1686 && optimize_function_for_speed_p (cfun
))
1688 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1689 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1690 align_functions_log
, align_functions
- 1);
1692 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1696 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1697 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1700 if (!DECL_IGNORED_P (decl
))
1701 (*debug_hooks
->begin_function
) (decl
);
1703 /* Make function name accessible from other files, if appropriate. */
1705 if (TREE_PUBLIC (decl
))
1707 notice_global_symbol (decl
);
1709 globalize_decl (decl
);
1711 maybe_assemble_visibility (decl
);
1714 if (DECL_PRESERVE_P (decl
))
1715 targetm
.asm_out
.mark_decl_preserved (fnname
);
1717 /* Do any machine/system dependent processing of the function name. */
1718 #ifdef ASM_DECLARE_FUNCTION_NAME
1719 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1721 /* Standard thing is just output label for the function. */
1722 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1723 #endif /* ASM_DECLARE_FUNCTION_NAME */
1725 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1726 saw_no_split_stack
= true;
1729 /* Output assembler code associated with defining the size of the
1730 function. DECL describes the function. NAME is the function's name. */
1733 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1735 #ifdef ASM_DECLARE_FUNCTION_SIZE
1736 /* We could have switched section in the middle of the function. */
1737 if (flag_reorder_blocks_and_partition
)
1738 switch_to_section (function_section (decl
));
1739 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1741 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1743 output_constant_pool (fnname
, decl
);
1744 switch_to_section (function_section (decl
)); /* need to switch back */
1746 /* Output labels for end of hot/cold text sections (to be used by
1748 if (flag_reorder_blocks_and_partition
)
1750 section
*save_text_section
;
1752 save_text_section
= in_section
;
1753 switch_to_section (unlikely_text_section ());
1754 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1755 if (first_function_block_is_cold
)
1756 switch_to_section (text_section
);
1758 switch_to_section (function_section (decl
));
1759 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1760 switch_to_section (save_text_section
);
1764 /* Assemble code to leave SIZE bytes of zeros. */
1767 assemble_zeros (unsigned HOST_WIDE_INT size
)
1769 /* Do no output if -fsyntax-only. */
1770 if (flag_syntax_only
)
1773 #ifdef ASM_NO_SKIP_IN_TEXT
1774 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1775 so we must output 0s explicitly in the text section. */
1776 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1778 unsigned HOST_WIDE_INT i
;
1779 for (i
= 0; i
< size
; i
++)
1780 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1785 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1788 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1791 assemble_align (int align
)
1793 if (align
> BITS_PER_UNIT
)
1795 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1799 /* Assemble a string constant with the specified C string as contents. */
1802 assemble_string (const char *p
, int size
)
1807 /* If the string is very long, split it up. */
1811 int thissize
= size
- pos
;
1812 if (thissize
> maximum
)
1815 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1823 /* A noswitch_section_callback for lcomm_section. */
1826 emit_local (tree decl ATTRIBUTE_UNUSED
,
1827 const char *name ATTRIBUTE_UNUSED
,
1828 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1829 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1831 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1832 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1833 size
, DECL_ALIGN (decl
));
1835 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1836 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1839 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1844 /* A noswitch_section_callback for bss_noswitch_section. */
1846 #if defined ASM_OUTPUT_ALIGNED_BSS
1848 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1849 const char *name ATTRIBUTE_UNUSED
,
1850 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1851 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1853 #if defined ASM_OUTPUT_ALIGNED_BSS
1854 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
,
1855 get_variable_align (decl
));
1861 /* A noswitch_section_callback for comm_section. */
1864 emit_common (tree decl ATTRIBUTE_UNUSED
,
1865 const char *name ATTRIBUTE_UNUSED
,
1866 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1867 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1869 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1870 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1871 size
, get_variable_align (decl
));
1873 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1874 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
,
1875 get_variable_align (decl
));
1878 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1883 /* A noswitch_section_callback for tls_comm_section. */
1886 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1887 const char *name ATTRIBUTE_UNUSED
,
1888 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1889 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1891 #ifdef ASM_OUTPUT_TLS_COMMON
1892 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
1895 sorry ("thread-local COMMON data not implemented");
1900 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1901 NAME is the name of DECL's SYMBOL_REF. */
1904 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
,
1907 unsigned HOST_WIDE_INT size
, rounded
;
1909 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
1912 if ((flag_sanitize
& SANITIZE_ADDRESS
) && asan_protect_global (decl
))
1913 size
+= asan_red_zone_size (size
);
1915 /* Don't allocate zero bytes of common,
1916 since that means "undefined external" in the linker. */
1920 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1921 so that each uninitialized object starts on such a boundary. */
1922 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
1923 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
1924 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
1926 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
1927 && (unsigned HOST_WIDE_INT
) (align
/ BITS_PER_UNIT
) > rounded
)
1928 error ("requested alignment for %q+D is greater than "
1929 "implemented alignment of %wu", decl
, rounded
);
1932 /* A subroutine of assemble_variable. Output the label and contents of
1933 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1934 is as for assemble_variable. */
1937 assemble_variable_contents (tree decl
, const char *name
,
1938 bool dont_output_data
)
1940 /* Do any machine/system dependent processing of the object. */
1941 #ifdef ASM_DECLARE_OBJECT_NAME
1942 last_assemble_variable_decl
= decl
;
1943 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
1945 /* Standard thing is just output label for the object. */
1946 ASM_OUTPUT_LABEL (asm_out_file
, name
);
1947 #endif /* ASM_DECLARE_OBJECT_NAME */
1949 if (!dont_output_data
)
1951 if (DECL_INITIAL (decl
)
1952 && DECL_INITIAL (decl
) != error_mark_node
1953 && !initializer_zerop (DECL_INITIAL (decl
)))
1954 /* Output the actual data. */
1955 output_constant (DECL_INITIAL (decl
),
1956 tree_to_uhwi (DECL_SIZE_UNIT (decl
)),
1957 get_variable_align (decl
));
1959 /* Leave space for it. */
1960 assemble_zeros (tree_to_uhwi (DECL_SIZE_UNIT (decl
)));
1964 /* Assemble everything that is needed for a variable or function declaration.
1965 Not used for automatic variables, and not used for function definitions.
1966 Should not be called for variables of incomplete structure type.
1968 TOP_LEVEL is nonzero if this variable has file scope.
1969 AT_END is nonzero if this is the special handling, at end of compilation,
1970 to define things that have had only tentative definitions.
1971 DONT_OUTPUT_DATA if nonzero means don't actually output the
1972 initial value (that will be done by the caller). */
1975 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
1976 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
1979 rtx decl_rtl
, symbol
;
1982 bool asan_protected
= false;
1984 /* This function is supposed to handle VARIABLES. Ensure we have one. */
1985 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
1987 /* Emulated TLS had better not get this far. */
1988 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
1990 last_assemble_variable_decl
= 0;
1992 /* Normally no need to say anything here for external references,
1993 since assemble_external is called by the language-specific code
1994 when a declaration is first seen. */
1996 if (DECL_EXTERNAL (decl
))
1999 /* Do nothing for global register variables. */
2000 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
2002 TREE_ASM_WRITTEN (decl
) = 1;
2006 /* If type was incomplete when the variable was declared,
2007 see if it is complete now. */
2009 if (DECL_SIZE (decl
) == 0)
2010 layout_decl (decl
, 0);
2012 /* Still incomplete => don't allocate it; treat the tentative defn
2013 (which is what it must have been) as an `extern' reference. */
2015 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2017 error ("storage size of %q+D isn%'t known", decl
);
2018 TREE_ASM_WRITTEN (decl
) = 1;
2022 /* The first declaration of a variable that comes through this function
2023 decides whether it is global (in C, has external linkage)
2024 or local (in C, has internal linkage). So do nothing more
2025 if this function has already run. */
2027 if (TREE_ASM_WRITTEN (decl
))
2030 /* Make sure targetm.encode_section_info is invoked before we set
2032 decl_rtl
= DECL_RTL (decl
);
2034 TREE_ASM_WRITTEN (decl
) = 1;
2036 /* Do no output if -fsyntax-only. */
2037 if (flag_syntax_only
)
2040 if (! dont_output_data
2041 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
2043 error ("size of variable %q+D is too large", decl
);
2047 gcc_assert (MEM_P (decl_rtl
));
2048 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2049 symbol
= XEXP (decl_rtl
, 0);
2051 /* If this symbol belongs to the tree constant pool, output the constant
2052 if it hasn't already been written. */
2053 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
2055 tree decl
= SYMBOL_REF_DECL (symbol
);
2056 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
2057 output_constant_def_contents (symbol
);
2063 name
= XSTR (symbol
, 0);
2064 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2065 notice_global_symbol (decl
);
2067 /* Compute the alignment of this data. */
2069 align_variable (decl
, dont_output_data
);
2071 if ((flag_sanitize
& SANITIZE_ADDRESS
)
2072 && asan_protect_global (decl
))
2074 asan_protected
= true;
2075 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
2076 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
2079 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2081 align
= get_variable_align (decl
);
2083 if (TREE_PUBLIC (decl
))
2084 maybe_assemble_visibility (decl
);
2086 if (DECL_PRESERVE_P (decl
))
2087 targetm
.asm_out
.mark_decl_preserved (name
);
2089 /* First make the assembler name(s) global if appropriate. */
2090 sect
= get_variable_section (decl
, false);
2091 if (TREE_PUBLIC (decl
)
2092 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2093 globalize_decl (decl
);
2095 /* Output any data that we will need to use the address of. */
2096 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2097 output_addressed_constants (DECL_INITIAL (decl
));
2099 /* dbxout.c needs to know this. */
2100 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2101 DECL_IN_TEXT_SECTION (decl
) = 1;
2103 /* If the decl is part of an object_block, make sure that the decl
2104 has been positioned within its block, but do not write out its
2105 definition yet. output_object_blocks will do that later. */
2106 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2108 gcc_assert (!dont_output_data
);
2109 place_block_symbol (symbol
);
2111 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2112 assemble_noswitch_variable (decl
, name
, sect
, align
);
2115 /* The following bit of code ensures that vtable_map
2116 variables are not only in the comdat section, but that
2117 each variable has its own unique comdat name. If this
2118 code is removed, the variables end up in the same section
2119 with a single comdat name.
2121 FIXME: resolve_unique_section needs to deal better with
2122 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
2123 that is fixed, this if-else statement can be replaced with
2124 a single call to "switch_to_section (sect)". */
2125 if (sect
->named
.name
2126 && (strcmp (sect
->named
.name
, ".vtable_map_vars") == 0))
2128 #if defined (OBJECT_FORMAT_ELF)
2129 targetm
.asm_out
.named_section (sect
->named
.name
,
2130 sect
->named
.common
.flags
2135 switch_to_section (sect
);
2139 switch_to_section (sect
);
2140 if (align
> BITS_PER_UNIT
)
2141 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
2142 assemble_variable_contents (decl
, name
, dont_output_data
);
2145 unsigned HOST_WIDE_INT
int size
2146 = tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2147 assemble_zeros (asan_red_zone_size (size
));
2153 /* Given a function declaration (FN_DECL), this function assembles the
2154 function into the .preinit_array section. */
2157 assemble_vtv_preinit_initializer (tree fn_decl
)
2160 unsigned flags
= SECTION_WRITE
;
2161 rtx symbol
= XEXP (DECL_RTL (fn_decl
), 0);
2163 flags
|= SECTION_NOTYPE
;
2164 sect
= get_section (".preinit_array", flags
, fn_decl
);
2165 switch_to_section (sect
);
2166 assemble_addr_to_section (symbol
, sect
);
2169 /* Return 1 if type TYPE contains any pointers. */
2172 contains_pointers_p (tree type
)
2174 switch (TREE_CODE (type
))
2177 case REFERENCE_TYPE
:
2178 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2179 so I'll play safe and return 1. */
2185 case QUAL_UNION_TYPE
:
2188 /* For a type that has fields, see if the fields have pointers. */
2189 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2190 if (TREE_CODE (fields
) == FIELD_DECL
2191 && contains_pointers_p (TREE_TYPE (fields
)))
2197 /* An array type contains pointers if its element type does. */
2198 return contains_pointers_p (TREE_TYPE (type
));
2205 /* We delay assemble_external processing until
2206 the compilation unit is finalized. This is the best we can do for
2207 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2208 it all the way to final. See PR 17982 for further discussion. */
2209 static GTY(()) tree pending_assemble_externals
;
2211 #ifdef ASM_OUTPUT_EXTERNAL
2212 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2213 As a result, assemble_external can be called after the list of externals
2214 is processed and the pointer set destroyed. */
2215 static bool pending_assemble_externals_processed
;
2217 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2218 TREE_LIST in assemble_external. */
2219 static struct pointer_set_t
*pending_assemble_externals_set
;
2221 /* True if DECL is a function decl for which no out-of-line copy exists.
2222 It is assumed that DECL's assembler name has been set. */
2225 incorporeal_function_p (tree decl
)
2227 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2231 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2232 && (DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
2233 || DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA_WITH_ALIGN
))
2236 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2237 /* Atomic or sync builtins which have survived this far will be
2238 resolved externally and therefore are not incorporeal. */
2239 if (strncmp (name
, "__builtin_", 10) == 0)
2245 /* Actually do the tests to determine if this is necessary, and invoke
2246 ASM_OUTPUT_EXTERNAL. */
2248 assemble_external_real (tree decl
)
2250 rtx rtl
= DECL_RTL (decl
);
2252 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2253 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2254 && !incorporeal_function_p (decl
))
2256 /* Some systems do require some output. */
2257 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2258 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2264 process_pending_assemble_externals (void)
2266 #ifdef ASM_OUTPUT_EXTERNAL
2268 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2269 assemble_external_real (TREE_VALUE (list
));
2271 pending_assemble_externals
= 0;
2272 pending_assemble_externals_processed
= true;
2273 pointer_set_destroy (pending_assemble_externals_set
);
2277 /* This TREE_LIST contains any weak symbol declarations waiting
2279 static GTY(()) tree weak_decls
;
2281 /* Output something to declare an external symbol to the assembler,
2282 and qualifiers such as weakness. (Most assemblers don't need
2283 extern declaration, so we normally output nothing.) Do nothing if
2284 DECL is not external. */
2287 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2289 /* Make sure that the ASM_OUT_FILE is open.
2290 If it's not, we should not be calling this function. */
2291 gcc_assert (asm_out_file
);
2293 /* In a perfect world, the following condition would be true.
2294 Sadly, the Java and Go front ends emit assembly *from the front end*,
2295 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2297 /* This function should only be called if we are expanding, or have
2299 Ideally, only final.c would be calling this function, but it is
2300 not clear whether that would break things somehow. See PR 17982
2301 for further discussion. */
2302 gcc_assert (cgraph_state
== CGRAPH_STATE_EXPANSION
2303 || cgraph_state
== CGRAPH_STATE_FINISHED
);
2306 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2309 /* We want to output annotation for weak and external symbols at
2310 very last to check if they are references or not. */
2312 if (TARGET_SUPPORTS_WEAK
2314 /* TREE_STATIC is a weird and abused creature which is not
2315 generally the right test for whether an entity has been
2316 locally emitted, inlined or otherwise not-really-extern, but
2317 for declarations that can be weak, it happens to be
2319 && !TREE_STATIC (decl
)
2320 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2321 && value_member (decl
, weak_decls
) == NULL_TREE
)
2322 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2324 #ifdef ASM_OUTPUT_EXTERNAL
2325 if (pending_assemble_externals_processed
)
2327 assemble_external_real (decl
);
2331 if (! pointer_set_insert (pending_assemble_externals_set
, decl
))
2332 pending_assemble_externals
= tree_cons (NULL
, decl
,
2333 pending_assemble_externals
);
2337 /* Similar, for calling a library function FUN. */
2340 assemble_external_libcall (rtx fun
)
2342 /* Declare library function name external when first used, if nec. */
2343 if (! SYMBOL_REF_USED (fun
))
2345 SYMBOL_REF_USED (fun
) = 1;
2346 targetm
.asm_out
.external_libcall (fun
);
2350 /* Assemble a label named NAME. */
2353 assemble_label (FILE *file
, const char *name
)
2355 ASM_OUTPUT_LABEL (file
, name
);
2358 /* Set the symbol_referenced flag for ID. */
2360 mark_referenced (tree id
)
2362 TREE_SYMBOL_REFERENCED (id
) = 1;
2365 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2367 mark_decl_referenced (tree decl
)
2369 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2371 /* Extern inline functions don't become needed when referenced.
2372 If we know a method will be emitted in other TU and no new
2373 functions can be marked reachable, just use the external
2375 struct cgraph_node
*node
= cgraph_get_create_node (decl
);
2376 if (!DECL_EXTERNAL (decl
)
2377 && !node
->definition
)
2378 cgraph_mark_force_output_node (node
);
2380 else if (TREE_CODE (decl
) == VAR_DECL
)
2382 varpool_node
*node
= varpool_node_for_decl (decl
);
2383 /* C++ frontend use mark_decl_references to force COMDAT variables
2384 to be output that might appear dead otherwise. */
2385 node
->force_output
= true;
2387 /* else do nothing - we can get various sorts of CST nodes here,
2388 which do not need to be marked. */
2392 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2393 until we find an identifier that is not itself a transparent alias.
2394 Modify the alias passed to it by reference (and all aliases on the
2395 way to the ultimate target), such that they do not have to be
2396 followed again, and return the ultimate target of the alias
2400 ultimate_transparent_alias_target (tree
*alias
)
2402 tree target
= *alias
;
2404 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
2406 gcc_assert (TREE_CHAIN (target
));
2407 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
2408 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
2409 && ! TREE_CHAIN (target
));
2416 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2417 starts with a *, the rest of NAME is output verbatim. Otherwise
2418 NAME is transformed in a target-specific way (usually by the
2419 addition of an underscore). */
2422 assemble_name_raw (FILE *file
, const char *name
)
2425 fputs (&name
[1], file
);
2427 ASM_OUTPUT_LABELREF (file
, name
);
2430 /* Like assemble_name_raw, but should be used when NAME might refer to
2431 an entity that is also represented as a tree (like a function or
2432 variable). If NAME does refer to such an entity, that entity will
2433 be marked as referenced. */
2436 assemble_name (FILE *file
, const char *name
)
2438 const char *real_name
;
2441 real_name
= targetm
.strip_name_encoding (name
);
2443 id
= maybe_get_identifier (real_name
);
2448 mark_referenced (id
);
2449 ultimate_transparent_alias_target (&id
);
2451 name
= IDENTIFIER_POINTER (id
);
2452 gcc_assert (! TREE_CHAIN (id
));
2455 assemble_name_raw (file
, name
);
2458 /* Allocate SIZE bytes writable static space with a gensym name
2459 and return an RTX to refer to its address. */
2462 assemble_static_space (unsigned HOST_WIDE_INT size
)
2465 const char *namestring
;
2468 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2470 namestring
= ggc_strdup (name
);
2472 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2473 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2475 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2476 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2479 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2480 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2483 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2484 so that each uninitialized object starts on such a boundary. */
2485 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2486 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2487 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2488 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2489 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2490 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2497 /* Assemble the static constant template for function entry trampolines.
2498 This is done at most once per compilation.
2499 Returns an RTX for the address of the template. */
2501 static GTY(()) rtx initial_trampoline
;
2504 assemble_trampoline_template (void)
2511 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2513 if (initial_trampoline
)
2514 return initial_trampoline
;
2516 /* By default, put trampoline templates in read-only data section. */
2518 #ifdef TRAMPOLINE_SECTION
2519 switch_to_section (TRAMPOLINE_SECTION
);
2521 switch_to_section (readonly_data_section
);
2524 /* Write the assembler code to define one. */
2525 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2527 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2529 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2530 targetm
.asm_out
.trampoline_template (asm_out_file
);
2532 /* Record the rtl to refer to it. */
2533 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2534 name
= ggc_strdup (label
);
2535 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2536 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2538 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2539 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2540 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2542 return initial_trampoline
;
2545 /* A and B are either alignments or offsets. Return the minimum alignment
2546 that may be assumed after adding the two together. */
2548 static inline unsigned
2549 min_align (unsigned int a
, unsigned int b
)
2551 return (a
| b
) & -(a
| b
);
2554 /* Return the assembler directive for creating a given kind of integer
2555 object. SIZE is the number of bytes in the object and ALIGNED_P
2556 indicates whether it is known to be aligned. Return NULL if the
2557 assembly dialect has no such directive.
2559 The returned string should be printed at the start of a new line and
2560 be followed immediately by the object's initial value. */
2563 integer_asm_op (int size
, int aligned_p
)
2565 struct asm_int_op
*ops
;
2568 ops
= &targetm
.asm_out
.aligned_op
;
2570 ops
= &targetm
.asm_out
.unaligned_op
;
2575 return targetm
.asm_out
.byte_op
;
2589 /* Use directive OP to assemble an integer object X. Print OP at the
2590 start of the line, followed immediately by the value of X. */
2593 assemble_integer_with_op (const char *op
, rtx x
)
2595 fputs (op
, asm_out_file
);
2596 output_addr_const (asm_out_file
, x
);
2597 fputc ('\n', asm_out_file
);
2600 /* The default implementation of the asm_out.integer target hook. */
2603 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2604 unsigned int size ATTRIBUTE_UNUSED
,
2605 int aligned_p ATTRIBUTE_UNUSED
)
2607 const char *op
= integer_asm_op (size
, aligned_p
);
2608 /* Avoid GAS bugs for large values. Specifically negative values whose
2609 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2610 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE
/ BITS_PER_UNIT
)
2612 return op
&& (assemble_integer_with_op (op
, x
), true);
2615 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2616 the alignment of the integer in bits. Return 1 if we were able to output
2617 the constant, otherwise 0. We must be able to output the constant,
2618 if FORCE is nonzero. */
2621 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2625 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2627 /* See if the target hook can handle this kind of object. */
2628 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2631 /* If the object is a multi-byte one, try splitting it up. Split
2632 it into words it if is multi-word, otherwise split it into bytes. */
2635 enum machine_mode omode
, imode
;
2636 unsigned int subalign
;
2637 unsigned int subsize
, i
;
2638 enum mode_class mclass
;
2640 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2641 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2642 if (GET_CODE (x
) == CONST_FIXED
)
2643 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2647 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2648 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2650 for (i
= 0; i
< size
; i
+= subsize
)
2652 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2653 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2659 /* If we've printed some of it, but not all of it, there's no going
2664 gcc_assert (!force
);
2670 assemble_real (REAL_VALUE_TYPE d
, enum machine_mode mode
, unsigned int align
)
2672 long data
[4] = {0, 0, 0, 0};
2674 int bitsize
, nelts
, nunits
, units_per
;
2676 /* This is hairy. We have a quantity of known size. real_to_target
2677 will put it into an array of *host* longs, 32 bits per element
2678 (even if long is more than 32 bits). We need to determine the
2679 number of array elements that are occupied (nelts) and the number
2680 of *target* min-addressable units that will be occupied in the
2681 object file (nunits). We cannot assume that 32 divides the
2682 mode's bitsize (size * BITS_PER_UNIT) evenly.
2684 size * BITS_PER_UNIT is used here to make sure that padding bits
2685 (which might appear at either end of the value; real_to_target
2686 will include the padding bits in its output array) are included. */
2688 nunits
= GET_MODE_SIZE (mode
);
2689 bitsize
= nunits
* BITS_PER_UNIT
;
2690 nelts
= CEIL (bitsize
, 32);
2691 units_per
= 32 / BITS_PER_UNIT
;
2693 real_to_target (data
, &d
, mode
);
2695 /* Put out the first word with the specified alignment. */
2696 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2697 nunits
-= units_per
;
2699 /* Subsequent words need only 32-bit alignment. */
2700 align
= min_align (align
, 32);
2702 for (i
= 1; i
< nelts
; i
++)
2704 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2705 nunits
-= units_per
;
2709 /* Given an expression EXP with a constant value,
2710 reduce it to the sum of an assembler symbol and an integer.
2711 Store them both in the structure *VALUE.
2712 EXP must be reducible. */
2716 HOST_WIDE_INT offset
;
2720 decode_addr_const (tree exp
, struct addr_const
*value
)
2722 tree target
= TREE_OPERAND (exp
, 0);
2728 if (TREE_CODE (target
) == COMPONENT_REF
2729 && tree_fits_shwi_p (byte_position (TREE_OPERAND (target
, 1))))
2731 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2732 target
= TREE_OPERAND (target
, 0);
2734 else if (TREE_CODE (target
) == ARRAY_REF
2735 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2737 offset
+= (tree_to_uhwi (TYPE_SIZE_UNIT (TREE_TYPE (target
)))
2738 * tree_to_shwi (TREE_OPERAND (target
, 1)));
2739 target
= TREE_OPERAND (target
, 0);
2741 else if (TREE_CODE (target
) == MEM_REF
2742 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2744 offset
+= mem_ref_offset (target
).to_short_addr ();
2745 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2747 else if (TREE_CODE (target
) == INDIRECT_REF
2748 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2749 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2751 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2756 switch (TREE_CODE (target
))
2760 x
= DECL_RTL (target
);
2764 x
= gen_rtx_MEM (FUNCTION_MODE
,
2765 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2774 x
= output_constant_def (target
, 1);
2781 gcc_assert (MEM_P (x
));
2785 value
->offset
= offset
;
2789 static GTY((param_is (struct constant_descriptor_tree
)))
2790 htab_t const_desc_htab
;
2792 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2794 /* Constant pool accessor function. */
2797 constant_pool_htab (void)
2799 return const_desc_htab
;
2802 /* Compute a hash code for a constant expression. */
2805 const_desc_hash (const void *ptr
)
2807 return ((const struct constant_descriptor_tree
*)ptr
)->hash
;
2811 const_hash_1 (const tree exp
)
2816 enum tree_code code
= TREE_CODE (exp
);
2818 /* Either set P and LEN to the address and len of something to hash and
2819 exit the switch or return a value. */
2824 p
= (char *) &TREE_INT_CST_ELT (exp
, 0);
2825 len
= TREE_INT_CST_NUNITS (exp
) * sizeof (HOST_WIDE_INT
);
2829 return real_hash (TREE_REAL_CST_PTR (exp
));
2832 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2835 p
= TREE_STRING_POINTER (exp
);
2836 len
= TREE_STRING_LENGTH (exp
);
2840 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2841 + const_hash_1 (TREE_IMAGPART (exp
)));
2847 hi
= 7 + VECTOR_CST_NELTS (exp
);
2849 for (i
= 0; i
< VECTOR_CST_NELTS (exp
); ++i
)
2850 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ELT (exp
, i
));
2857 unsigned HOST_WIDE_INT idx
;
2860 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2862 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2864 hi
= hi
* 603 + const_hash_1 (value
);
2872 struct addr_const value
;
2874 decode_addr_const (exp
, &value
);
2875 switch (GET_CODE (value
.base
))
2878 /* Don't hash the address of the SYMBOL_REF;
2879 only use the offset and the symbol name. */
2881 p
= XSTR (value
.base
, 0);
2882 for (i
= 0; p
[i
] != 0; i
++)
2883 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2887 hi
= value
.offset
+ CODE_LABEL_NUMBER (XEXP (value
.base
, 0)) * 13;
2897 case POINTER_PLUS_EXPR
:
2899 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2900 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2903 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2906 /* A language specific constant. Just hash the code. */
2910 /* Compute hashing function. */
2912 for (i
= 0; i
< len
; i
++)
2913 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2918 /* Wrapper of compare_constant, for the htab interface. */
2920 const_desc_eq (const void *p1
, const void *p2
)
2922 const struct constant_descriptor_tree
*const c1
2923 = (const struct constant_descriptor_tree
*) p1
;
2924 const struct constant_descriptor_tree
*const c2
2925 = (const struct constant_descriptor_tree
*) p2
;
2926 if (c1
->hash
!= c2
->hash
)
2928 return compare_constant (c1
->value
, c2
->value
);
2931 /* Compare t1 and t2, and return 1 only if they are known to result in
2932 the same bit pattern on output. */
2935 compare_constant (const tree t1
, const tree t2
)
2937 enum tree_code typecode
;
2939 if (t1
== NULL_TREE
)
2940 return t2
== NULL_TREE
;
2941 if (t2
== NULL_TREE
)
2944 if (TREE_CODE (t1
) != TREE_CODE (t2
))
2947 switch (TREE_CODE (t1
))
2950 /* Integer constants are the same only if the same width of type. */
2951 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2953 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2955 return tree_int_cst_equal (t1
, t2
);
2958 /* Real constants are the same only if the same width of type. */
2959 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2962 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
2965 /* Fixed constants are the same only if the same width of type. */
2966 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2969 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
2972 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2975 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
2976 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
2977 TREE_STRING_LENGTH (t1
)));
2980 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
2981 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
2987 if (VECTOR_CST_NELTS (t1
) != VECTOR_CST_NELTS (t2
))
2990 for (i
= 0; i
< VECTOR_CST_NELTS (t1
); ++i
)
2991 if (!compare_constant (VECTOR_CST_ELT (t1
, i
),
2992 VECTOR_CST_ELT (t2
, i
)))
3000 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
3001 unsigned HOST_WIDE_INT idx
;
3003 typecode
= TREE_CODE (TREE_TYPE (t1
));
3004 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
3007 if (typecode
== ARRAY_TYPE
)
3009 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
3010 /* For arrays, check that the sizes all match. */
3011 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
3013 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
3018 /* For record and union constructors, require exact type
3020 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
3024 v1
= CONSTRUCTOR_ELTS (t1
);
3025 v2
= CONSTRUCTOR_ELTS (t2
);
3026 if (vec_safe_length (v1
) != vec_safe_length (v2
))
3029 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
3031 constructor_elt
*c1
= &(*v1
)[idx
];
3032 constructor_elt
*c2
= &(*v2
)[idx
];
3034 /* Check that each value is the same... */
3035 if (!compare_constant (c1
->value
, c2
->value
))
3037 /* ... and that they apply to the same fields! */
3038 if (typecode
== ARRAY_TYPE
)
3040 if (!compare_constant (c1
->index
, c2
->index
))
3045 if (c1
->index
!= c2
->index
)
3056 struct addr_const value1
, value2
;
3060 decode_addr_const (t1
, &value1
);
3061 decode_addr_const (t2
, &value2
);
3063 if (value1
.offset
!= value2
.offset
)
3066 code
= GET_CODE (value1
.base
);
3067 if (code
!= GET_CODE (value2
.base
))
3073 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3077 ret
= (CODE_LABEL_NUMBER (XEXP (value1
.base
, 0))
3078 == CODE_LABEL_NUMBER (XEXP (value2
.base
, 0)));
3088 case POINTER_PLUS_EXPR
:
3091 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3092 && compare_constant (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3095 case VIEW_CONVERT_EXPR
:
3096 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3105 /* Return the section into which constant EXP should be placed. */
3108 get_constant_section (tree exp
, unsigned int align
)
3110 return targetm
.asm_out
.select_section (exp
,
3111 compute_reloc_for_constant (exp
),
3115 /* Return the size of constant EXP in bytes. */
3117 static HOST_WIDE_INT
3118 get_constant_size (tree exp
)
3122 size
= int_size_in_bytes (TREE_TYPE (exp
));
3123 if (TREE_CODE (exp
) == STRING_CST
)
3124 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3128 /* Subroutine of output_constant_def:
3129 No constant equal to EXP is known to have been output.
3130 Make a constant descriptor to enter EXP in the hash table.
3131 Assign the label number and construct RTL to refer to the
3132 constant's location in memory.
3133 Caller is responsible for updating the hash table. */
3135 static struct constant_descriptor_tree
*
3136 build_constant_desc (tree exp
)
3138 struct constant_descriptor_tree
*desc
;
3144 desc
= ggc_alloc
<constant_descriptor_tree
> ();
3147 /* Create a string containing the label name, in LABEL. */
3148 labelno
= const_labelno
++;
3149 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3151 /* Construct the VAR_DECL associated with the constant. */
3152 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3154 DECL_ARTIFICIAL (decl
) = 1;
3155 DECL_IGNORED_P (decl
) = 1;
3156 TREE_READONLY (decl
) = 1;
3157 TREE_STATIC (decl
) = 1;
3158 TREE_ADDRESSABLE (decl
) = 1;
3159 /* We don't set the RTL yet as this would cause varpool to assume that the
3160 variable is referenced. Moreover, it would just be dropped in LTO mode.
3161 Instead we set the flag that will be recognized in make_decl_rtl. */
3162 DECL_IN_CONSTANT_POOL (decl
) = 1;
3163 DECL_INITIAL (decl
) = desc
->value
;
3164 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3165 architectures so use DATA_ALIGNMENT as well, except for strings. */
3166 if (TREE_CODE (exp
) == STRING_CST
)
3168 #ifdef CONSTANT_ALIGNMENT
3169 DECL_ALIGN (decl
) = CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
));
3173 align_variable (decl
, 0);
3175 /* Now construct the SYMBOL_REF and the MEM. */
3176 if (use_object_blocks_p ())
3178 section
*sect
= get_constant_section (exp
, DECL_ALIGN (decl
));
3179 symbol
= create_block_symbol (ggc_strdup (label
),
3180 get_block_for_section (sect
), -1);
3183 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3184 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3185 SET_SYMBOL_REF_DECL (symbol
, decl
);
3186 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3188 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3189 set_mem_attributes (rtl
, exp
, 1);
3190 set_mem_alias_set (rtl
, 0);
3191 set_mem_alias_set (rtl
, const_alias_set
);
3193 /* We cannot share RTX'es in pool entries.
3194 Mark this piece of RTL as required for unsharing. */
3195 RTX_FLAG (rtl
, used
) = 1;
3197 /* Set flags or add text to the name to record information, such as
3198 that it is a local symbol. If the name is changed, the macro
3199 ASM_OUTPUT_LABELREF will have to know how to strip this
3200 information. This call might invalidate our local variable
3201 SYMBOL; we can't use it afterward. */
3202 targetm
.encode_section_info (exp
, rtl
, true);
3209 /* Return an rtx representing a reference to constant data in memory
3210 for the constant expression EXP.
3212 If assembler code for such a constant has already been output,
3213 return an rtx to refer to it.
3214 Otherwise, output such a constant in memory
3215 and generate an rtx for it.
3217 If DEFER is nonzero, this constant can be deferred and output only
3218 if referenced in the function after all optimizations.
3220 `const_desc_table' records which constants already have label strings. */
3223 output_constant_def (tree exp
, int defer
)
3225 struct constant_descriptor_tree
*desc
;
3226 struct constant_descriptor_tree key
;
3229 /* Look up EXP in the table of constant descriptors. If we didn't find
3230 it, create a new one. */
3232 key
.hash
= const_hash_1 (exp
);
3233 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3235 desc
= (struct constant_descriptor_tree
*) *loc
;
3238 desc
= build_constant_desc (exp
);
3239 desc
->hash
= key
.hash
;
3243 maybe_output_constant_def_contents (desc
, defer
);
3247 /* Subroutine of output_constant_def: Decide whether or not we need to
3248 output the constant DESC now, and if so, do it. */
3250 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3253 rtx symbol
= XEXP (desc
->rtl
, 0);
3254 tree exp
= desc
->value
;
3256 if (flag_syntax_only
)
3259 if (TREE_ASM_WRITTEN (exp
))
3260 /* Already output; don't do it again. */
3263 /* We can always defer constants as long as the context allows
3267 /* Increment n_deferred_constants if it exists. It needs to be at
3268 least as large as the number of constants actually referred to
3269 by the function. If it's too small we'll stop looking too early
3270 and fail to emit constants; if it's too large we'll only look
3271 through the entire function when we could have stopped earlier. */
3273 n_deferred_constants
++;
3277 output_constant_def_contents (symbol
);
3280 /* Subroutine of output_constant_def_contents. Output the definition
3281 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3282 constant's alignment in bits. */
3285 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3289 size
= get_constant_size (exp
);
3291 /* Do any machine/system dependent processing of the constant. */
3292 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3294 /* Output the value of EXP. */
3295 output_constant (exp
, size
, align
);
3298 /* We must output the constant data referred to by SYMBOL; do so. */
3301 output_constant_def_contents (rtx symbol
)
3303 tree decl
= SYMBOL_REF_DECL (symbol
);
3304 tree exp
= DECL_INITIAL (decl
);
3306 bool asan_protected
= false;
3308 /* Make sure any other constants whose addresses appear in EXP
3309 are assigned label numbers. */
3310 output_addressed_constants (exp
);
3312 /* We are no longer deferring this constant. */
3313 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3315 if ((flag_sanitize
& SANITIZE_ADDRESS
)
3316 && TREE_CODE (exp
) == STRING_CST
3317 && asan_protect_global (exp
))
3319 asan_protected
= true;
3320 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
3321 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
3324 /* If the constant is part of an object block, make sure that the
3325 decl has been positioned within its block, but do not write out
3326 its definition yet. output_object_blocks will do that later. */
3327 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3328 place_block_symbol (symbol
);
3331 align
= DECL_ALIGN (decl
);
3332 switch_to_section (get_constant_section (exp
, align
));
3333 if (align
> BITS_PER_UNIT
)
3334 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3335 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3338 HOST_WIDE_INT size
= get_constant_size (exp
);
3339 assemble_zeros (asan_red_zone_size (size
));
3344 /* Look up EXP in the table of constant descriptors. Return the rtl
3345 if it has been emitted, else null. */
3348 lookup_constant_def (tree exp
)
3350 struct constant_descriptor_tree
*desc
;
3351 struct constant_descriptor_tree key
;
3354 key
.hash
= const_hash_1 (exp
);
3355 desc
= (struct constant_descriptor_tree
*)
3356 htab_find_with_hash (const_desc_htab
, &key
, key
.hash
);
3358 return (desc
? desc
->rtl
: NULL_RTX
);
3361 /* Return a tree representing a reference to constant data in memory
3362 for the constant expression EXP.
3364 This is the counterpart of output_constant_def at the Tree level. */
3367 tree_output_constant_def (tree exp
)
3369 struct constant_descriptor_tree
*desc
, key
;
3373 /* Look up EXP in the table of constant descriptors. If we didn't find
3374 it, create a new one. */
3376 key
.hash
= const_hash_1 (exp
);
3377 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3379 desc
= (struct constant_descriptor_tree
*) *loc
;
3382 desc
= build_constant_desc (exp
);
3383 desc
->hash
= key
.hash
;
3387 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3388 varpool_finalize_decl (decl
);
3392 /* Used in the hash tables to avoid outputting the same constant
3393 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3394 are output once per function, not once per file. */
3395 /* ??? Only a few targets need per-function constant pools. Most
3396 can use one per-file pool. Should add a targetm bit to tell the
3399 struct GTY(()) rtx_constant_pool
{
3400 /* Pointers to first and last constant in pool, as ordered by offset. */
3401 struct constant_descriptor_rtx
*first
;
3402 struct constant_descriptor_rtx
*last
;
3404 /* Hash facility for making memory-constants from constant rtl-expressions.
3405 It is used on RISC machines where immediate integer arguments and
3406 constant addresses are restricted so that such constants must be stored
3408 htab_t
GTY((param_is (struct constant_descriptor_rtx
))) const_rtx_htab
;
3410 /* Current offset in constant pool (does not include any
3411 machine-specific header). */
3412 HOST_WIDE_INT offset
;
3415 struct GTY((chain_next ("%h.next"))) constant_descriptor_rtx
{
3416 struct constant_descriptor_rtx
*next
;
3420 HOST_WIDE_INT offset
;
3422 enum machine_mode mode
;
3428 /* Hash and compare functions for const_rtx_htab. */
3431 const_desc_rtx_hash (const void *ptr
)
3433 const struct constant_descriptor_rtx
*const desc
3434 = (const struct constant_descriptor_rtx
*) ptr
;
3439 const_desc_rtx_eq (const void *a
, const void *b
)
3441 const struct constant_descriptor_rtx
*const x
3442 = (const struct constant_descriptor_rtx
*) a
;
3443 const struct constant_descriptor_rtx
*const y
3444 = (const struct constant_descriptor_rtx
*) b
;
3446 if (x
->mode
!= y
->mode
)
3448 return rtx_equal_p (x
->constant
, y
->constant
);
3451 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3454 const_rtx_hash_1 (rtx
*xp
, void *data
)
3456 unsigned HOST_WIDE_INT hwi
;
3457 enum machine_mode mode
;
3464 code
= GET_CODE (x
);
3465 mode
= GET_MODE (x
);
3466 h
= (hashval_t
) code
* 1048573 + mode
;
3475 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3476 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3478 h
^= (hashval_t
) hwi
;
3479 for (i
= 1; i
< n
; ++i
)
3482 h
^= (hashval_t
) hwi
;
3487 case CONST_WIDE_INT
:
3488 hwi
= GET_MODE_PRECISION (mode
);
3490 for (i
= 0; i
< CONST_WIDE_INT_NUNITS (x
); i
++)
3491 hwi
^= CONST_WIDE_INT_ELT (x
, i
);
3496 if (TARGET_SUPPORTS_WIDE_INT
== 0 && mode
== VOIDmode
)
3498 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3502 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3506 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3512 for (i
= XVECLEN (x
, 0); i
-- > 0; )
3513 h
= h
* 251 + const_rtx_hash_1 (&XVECEXP (x
, 0, i
), data
);
3518 h
^= htab_hash_string (XSTR (x
, 0));
3522 h
= h
* 251 + CODE_LABEL_NUMBER (XEXP (x
, 0));
3526 case UNSPEC_VOLATILE
:
3527 h
= h
* 251 + XINT (x
, 1);
3534 hp
= (hashval_t
*) data
;
3535 *hp
= *hp
* 509 + h
;
3539 /* Compute a hash value for X, which should be a constant. */
3542 const_rtx_hash (rtx x
)
3545 for_each_rtx (&x
, const_rtx_hash_1
, &h
);
3550 /* Create and return a new rtx constant pool. */
3552 static struct rtx_constant_pool
*
3553 create_constant_pool (void)
3555 struct rtx_constant_pool
*pool
;
3557 pool
= ggc_alloc
<rtx_constant_pool
> ();
3558 pool
->const_rtx_htab
= htab_create_ggc (31, const_desc_rtx_hash
,
3559 const_desc_rtx_eq
, NULL
);
3566 /* Initialize constant pool hashing for a new function. */
3569 init_varasm_status (void)
3571 crtl
->varasm
.pool
= create_constant_pool ();
3572 crtl
->varasm
.deferred_constants
= 0;
3575 /* Given a MINUS expression, simplify it if both sides
3576 include the same symbol. */
3579 simplify_subtraction (rtx x
)
3581 rtx r
= simplify_rtx (x
);
3585 /* Given a constant rtx X, make (or find) a memory constant for its value
3586 and return a MEM rtx to refer to it in memory. */
3589 force_const_mem (enum machine_mode mode
, rtx x
)
3591 struct constant_descriptor_rtx
*desc
, tmp
;
3592 struct rtx_constant_pool
*pool
;
3599 /* If we're not allowed to drop X into the constant pool, don't. */
3600 if (targetm
.cannot_force_const_mem (mode
, x
))
3603 /* Record that this function has used a constant pool entry. */
3604 crtl
->uses_const_pool
= 1;
3606 /* Decide which pool to use. */
3607 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3608 ? shared_constant_pool
3609 : crtl
->varasm
.pool
);
3611 /* Lookup the value in the hashtable. */
3614 hash
= const_rtx_hash (x
);
3615 slot
= htab_find_slot_with_hash (pool
->const_rtx_htab
, &tmp
, hash
, INSERT
);
3616 desc
= (struct constant_descriptor_rtx
*) *slot
;
3618 /* If the constant was already present, return its memory. */
3620 return copy_rtx (desc
->mem
);
3622 /* Otherwise, create a new descriptor. */
3623 desc
= ggc_alloc
<constant_descriptor_rtx
> ();
3626 /* Align the location counter as required by EXP's data type. */
3627 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3628 #ifdef CONSTANT_ALIGNMENT
3630 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3631 if (type
!= NULL_TREE
)
3632 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3636 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3637 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3640 desc
->constant
= copy_rtx (tmp
.constant
);
3641 desc
->offset
= pool
->offset
;
3644 desc
->align
= align
;
3645 desc
->labelno
= const_labelno
;
3648 pool
->offset
+= GET_MODE_SIZE (mode
);
3650 pool
->last
->next
= desc
;
3652 pool
->first
= pool
->last
= desc
;
3655 /* Create a string containing the label name, in LABEL. */
3656 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3659 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3660 the constants pool. */
3661 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3663 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3664 symbol
= create_block_symbol (ggc_strdup (label
),
3665 get_block_for_section (sect
), -1);
3668 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3670 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3671 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3672 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3674 /* Construct the MEM. */
3675 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3676 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3677 set_mem_align (def
, align
);
3679 /* If we're dropping a label to the constant pool, make sure we
3681 if (GET_CODE (x
) == LABEL_REF
)
3682 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3684 return copy_rtx (def
);
3687 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3690 get_pool_constant (rtx addr
)
3692 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3695 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3696 and whether it has been output or not. */
3699 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3701 struct constant_descriptor_rtx
*desc
;
3703 desc
= SYMBOL_REF_CONSTANT (addr
);
3704 *pmarked
= (desc
->mark
!= 0);
3705 return desc
->constant
;
3708 /* Similar, return the mode. */
3711 get_pool_mode (const_rtx addr
)
3713 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3716 /* Return the size of the constant pool. */
3719 get_pool_size (void)
3721 return crtl
->varasm
.pool
->offset
;
3724 /* Worker function for output_constant_pool_1. Emit assembly for X
3725 in MODE with known alignment ALIGN. */
3728 output_constant_pool_2 (enum machine_mode mode
, rtx x
, unsigned int align
)
3730 switch (GET_MODE_CLASS (mode
))
3733 case MODE_DECIMAL_FLOAT
:
3737 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3738 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3739 assemble_real (r
, mode
, align
);
3744 case MODE_PARTIAL_INT
:
3749 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3752 case MODE_VECTOR_FLOAT
:
3753 case MODE_VECTOR_INT
:
3754 case MODE_VECTOR_FRACT
:
3755 case MODE_VECTOR_UFRACT
:
3756 case MODE_VECTOR_ACCUM
:
3757 case MODE_VECTOR_UACCUM
:
3760 enum machine_mode submode
= GET_MODE_INNER (mode
);
3761 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3763 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3764 units
= CONST_VECTOR_NUNITS (x
);
3766 for (i
= 0; i
< units
; i
++)
3768 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3769 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3779 /* Worker function for output_constant_pool. Emit constant DESC,
3780 giving it ALIGN bits of alignment. */
3783 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3790 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3791 whose CODE_LABEL has been deleted. This can occur if a jump table
3792 is eliminated by optimization. If so, write a constant of zero
3793 instead. Note that this can also happen by turning the
3794 CODE_LABEL into a NOTE. */
3795 /* ??? This seems completely and utterly wrong. Certainly it's
3796 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3797 functioning even with INSN_DELETED_P and friends. */
3800 switch (GET_CODE (tmp
))
3803 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3804 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3806 tmp
= XEXP (XEXP (tmp
, 0), 0);
3810 tmp
= XEXP (tmp
, 0);
3811 gcc_assert (!INSN_DELETED_P (tmp
));
3812 gcc_assert (!NOTE_P (tmp
)
3813 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3820 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3821 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3822 align
, desc
->labelno
, done
);
3825 assemble_align (align
);
3827 /* Output the label. */
3828 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3830 /* Output the data. */
3831 output_constant_pool_2 (desc
->mode
, x
, align
);
3833 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3834 sections have proper size. */
3835 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3837 && (in_section
->common
.flags
& SECTION_MERGE
))
3838 assemble_align (align
);
3840 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3846 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3847 to as used. Emit referenced deferred strings. This function can
3848 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3851 mark_constant (rtx
*current_rtx
, void *data ATTRIBUTE_UNUSED
)
3853 rtx x
= *current_rtx
;
3855 if (x
== NULL_RTX
|| GET_CODE (x
) != SYMBOL_REF
)
3858 if (CONSTANT_POOL_ADDRESS_P (x
))
3860 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3861 if (desc
->mark
== 0)
3864 for_each_rtx (&desc
->constant
, mark_constant
, NULL
);
3867 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3869 tree decl
= SYMBOL_REF_DECL (x
);
3870 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
3872 n_deferred_constants
--;
3873 output_constant_def_contents (x
);
3880 /* Look through appropriate parts of INSN, marking all entries in the
3881 constant pool which are actually being used. Entries that are only
3882 referenced by other constants are also marked as used. Emit
3883 deferred strings that are used. */
3886 mark_constants (rtx insn
)
3891 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3892 insns, not any notes that may be attached. We don't want to mark
3893 a constant just because it happens to appear in a REG_EQUIV note. */
3894 if (GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3896 rtx seq
= PATTERN (insn
);
3897 int i
, n
= XVECLEN (seq
, 0);
3898 for (i
= 0; i
< n
; ++i
)
3900 rtx subinsn
= XVECEXP (seq
, 0, i
);
3901 if (INSN_P (subinsn
))
3902 for_each_rtx (&PATTERN (subinsn
), mark_constant
, NULL
);
3906 for_each_rtx (&PATTERN (insn
), mark_constant
, NULL
);
3909 /* Look through the instructions for this function, and mark all the
3910 entries in POOL which are actually being used. Emit deferred constants
3911 which have indeed been used. */
3914 mark_constant_pool (void)
3918 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
3921 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3922 mark_constants (insn
);
3925 /* Write all the constants in POOL. */
3928 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
3930 struct constant_descriptor_rtx
*desc
;
3932 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3935 /* If the constant is part of an object_block, make sure that
3936 the constant has been positioned within its block, but do not
3937 write out its definition yet. output_object_blocks will do
3939 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
3940 && SYMBOL_REF_BLOCK (desc
->sym
))
3941 place_block_symbol (desc
->sym
);
3944 switch_to_section (targetm
.asm_out
.select_rtx_section
3945 (desc
->mode
, desc
->constant
, desc
->align
));
3946 output_constant_pool_1 (desc
, desc
->align
);
3951 /* Mark all constants that are used in the current function, then write
3952 out the function's private constant pool. */
3955 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
3956 tree fndecl ATTRIBUTE_UNUSED
)
3958 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
3960 /* It is possible for gcc to call force_const_mem and then to later
3961 discard the instructions which refer to the constant. In such a
3962 case we do not need to output the constant. */
3963 mark_constant_pool ();
3965 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3966 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3969 output_constant_pool_contents (pool
);
3971 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3972 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3976 /* Write the contents of the shared constant pool. */
3979 output_shared_constant_pool (void)
3981 output_constant_pool_contents (shared_constant_pool
);
3984 /* Determine what kind of relocations EXP may need. */
3987 compute_reloc_for_constant (tree exp
)
3989 int reloc
= 0, reloc2
;
3992 switch (TREE_CODE (exp
))
3996 /* Go inside any operations that get_inner_reference can handle and see
3997 if what's inside is a constant: no need to do anything here for
3998 addresses of variables or functions. */
3999 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4000 tem
= TREE_OPERAND (tem
, 0))
4003 if (TREE_CODE (tem
) == MEM_REF
4004 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
4006 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
4010 if (!targetm
.binds_local_p (tem
))
4017 case POINTER_PLUS_EXPR
:
4018 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4019 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4023 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4024 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4025 /* The difference of two local labels is computable at link time. */
4026 if (reloc
== 1 && reloc2
== 1)
4033 case VIEW_CONVERT_EXPR
:
4034 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4039 unsigned HOST_WIDE_INT idx
;
4040 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4042 reloc
|= compute_reloc_for_constant (tem
);
4052 /* Find all the constants whose addresses are referenced inside of EXP,
4053 and make sure assembler code with a label has been output for each one.
4054 Indicate whether an ADDR_EXPR has been encountered. */
4057 output_addressed_constants (tree exp
)
4061 switch (TREE_CODE (exp
))
4065 /* Go inside any operations that get_inner_reference can handle and see
4066 if what's inside is a constant: no need to do anything here for
4067 addresses of variables or functions. */
4068 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4069 tem
= TREE_OPERAND (tem
, 0))
4072 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4073 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4074 tem
= DECL_INITIAL (tem
);
4076 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4077 output_constant_def (tem
, 0);
4079 if (TREE_CODE (tem
) == MEM_REF
)
4080 output_addressed_constants (TREE_OPERAND (tem
, 0));
4084 case POINTER_PLUS_EXPR
:
4086 output_addressed_constants (TREE_OPERAND (exp
, 1));
4090 case VIEW_CONVERT_EXPR
:
4091 output_addressed_constants (TREE_OPERAND (exp
, 0));
4096 unsigned HOST_WIDE_INT idx
;
4097 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4099 output_addressed_constants (tem
);
4108 /* Whether a constructor CTOR is a valid static constant initializer if all
4109 its elements are. This used to be internal to initializer_constant_valid_p
4110 and has been exposed to let other functions like categorize_ctor_elements
4111 evaluate the property while walking a constructor for other purposes. */
4114 constructor_static_from_elts_p (const_tree ctor
)
4116 return (TREE_CONSTANT (ctor
)
4117 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4118 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4119 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4122 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4125 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4126 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4127 which are valid when ENDTYPE is an integer of any size; in
4128 particular, this does not accept a pointer minus a constant. This
4129 returns null_pointer_node if the VALUE is an absolute constant
4130 which can be used to initialize a static variable. Otherwise it
4134 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4138 if (!INTEGRAL_TYPE_P (endtype
))
4141 op0
= TREE_OPERAND (value
, 0);
4142 op1
= TREE_OPERAND (value
, 1);
4144 /* Like STRIP_NOPS except allow the operand mode to widen. This
4145 works around a feature of fold that simplifies (int)(p1 - p2) to
4146 ((int)p1 - (int)p2) under the theory that the narrower operation
4149 while (CONVERT_EXPR_P (op0
)
4150 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4152 tree inner
= TREE_OPERAND (op0
, 0);
4153 if (inner
== error_mark_node
4154 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4155 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4156 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4161 while (CONVERT_EXPR_P (op1
)
4162 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4164 tree inner
= TREE_OPERAND (op1
, 0);
4165 if (inner
== error_mark_node
4166 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4167 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4168 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4173 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4177 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4178 cache
? cache
+ 2 : NULL
);
4179 /* Both initializers must be known. */
4183 && (op0
== null_pointer_node
4184 || TREE_CODE (value
) == MINUS_EXPR
))
4185 return null_pointer_node
;
4187 /* Support differences between labels. */
4188 if (TREE_CODE (op0
) == LABEL_DECL
4189 && TREE_CODE (op1
) == LABEL_DECL
)
4190 return null_pointer_node
;
4192 if (TREE_CODE (op0
) == STRING_CST
4193 && TREE_CODE (op1
) == STRING_CST
4194 && operand_equal_p (op0
, op1
, 1))
4195 return null_pointer_node
;
4201 /* Helper function of initializer_constant_valid_p.
4202 Return nonzero if VALUE is a valid constant-valued expression
4203 for use in initializing a static variable; one that can be an
4204 element of a "constant" initializer.
4206 Return null_pointer_node if the value is absolute;
4207 if it is relocatable, return the variable that determines the relocation.
4208 We assume that VALUE has been folded as much as possible;
4209 therefore, we do not need to check for such things as
4210 arithmetic-combinations of integers.
4212 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4215 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4219 switch (TREE_CODE (value
))
4222 if (constructor_static_from_elts_p (value
))
4224 unsigned HOST_WIDE_INT idx
;
4226 bool absolute
= true;
4228 if (cache
&& cache
[0] == value
)
4230 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4233 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4240 cache
[1] = NULL_TREE
;
4244 if (reloc
!= null_pointer_node
)
4247 /* For a non-absolute relocation, there is no single
4248 variable that can be "the variable that determines the
4253 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4255 return absolute
? null_pointer_node
: error_mark_node
;
4258 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4266 return null_pointer_node
;
4271 tree op0
= staticp (TREE_OPERAND (value
, 0));
4274 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4275 to be a constant, this is old-skool offsetof-like nonsense. */
4276 if (TREE_CODE (op0
) == INDIRECT_REF
4277 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4278 return null_pointer_node
;
4279 /* Taking the address of a nested function involves a trampoline,
4280 unless we don't need or want one. */
4281 if (TREE_CODE (op0
) == FUNCTION_DECL
4282 && DECL_STATIC_CHAIN (op0
)
4283 && !TREE_NO_TRAMPOLINE (value
))
4285 /* "&{...}" requires a temporary to hold the constructed
4287 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4293 case NON_LVALUE_EXPR
:
4294 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4297 case VIEW_CONVERT_EXPR
:
4299 tree src
= TREE_OPERAND (value
, 0);
4300 tree src_type
= TREE_TYPE (src
);
4301 tree dest_type
= TREE_TYPE (value
);
4303 /* Allow view-conversions from aggregate to non-aggregate type only
4304 if the bit pattern is fully preserved afterwards; otherwise, the
4305 RTL expander won't be able to apply a subsequent transformation
4306 to the underlying constructor. */
4307 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4309 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4310 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4315 /* Allow all other kinds of view-conversion. */
4316 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4321 tree src
= TREE_OPERAND (value
, 0);
4322 tree src_type
= TREE_TYPE (src
);
4323 tree dest_type
= TREE_TYPE (value
);
4325 /* Allow conversions between pointer types, floating-point
4326 types, and offset types. */
4327 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4328 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4329 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4330 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4331 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4333 /* Allow length-preserving conversions between integer types. */
4334 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4335 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4336 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4338 /* Allow conversions between other integer types only if
4340 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4342 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4343 if (inner
== null_pointer_node
)
4344 return null_pointer_node
;
4348 /* Allow (int) &foo provided int is as wide as a pointer. */
4349 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4350 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4351 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4353 /* Likewise conversions from int to pointers, but also allow
4354 conversions from 0. */
4355 if ((POINTER_TYPE_P (dest_type
)
4356 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4357 && INTEGRAL_TYPE_P (src_type
))
4359 if (TREE_CODE (src
) == INTEGER_CST
4360 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4361 return null_pointer_node
;
4362 if (integer_zerop (src
))
4363 return null_pointer_node
;
4364 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4365 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4368 /* Allow conversions to struct or union types if the value
4370 if (TREE_CODE (dest_type
) == RECORD_TYPE
4371 || TREE_CODE (dest_type
) == UNION_TYPE
)
4372 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4376 case POINTER_PLUS_EXPR
:
4378 /* Any valid floating-point constants will have been folded by now;
4379 with -frounding-math we hit this with addition of two constants. */
4380 if (TREE_CODE (endtype
) == REAL_TYPE
)
4382 if (cache
&& cache
[0] == value
)
4384 if (! INTEGRAL_TYPE_P (endtype
)
4385 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4387 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4389 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4392 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4393 endtype
, ncache
+ 2);
4394 /* If either term is absolute, use the other term's relocation. */
4395 if (valid0
== null_pointer_node
)
4397 else if (valid1
== null_pointer_node
)
4399 /* Support narrowing pointer differences. */
4401 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4405 /* Support narrowing pointer differences. */
4406 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4415 if (TREE_CODE (endtype
) == REAL_TYPE
)
4417 if (cache
&& cache
[0] == value
)
4419 if (! INTEGRAL_TYPE_P (endtype
)
4420 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4422 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4424 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4427 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4428 endtype
, ncache
+ 2);
4429 /* Win if second argument is absolute. */
4430 if (valid1
== null_pointer_node
)
4432 /* Win if both arguments have the same relocation.
4433 Then the value is absolute. */
4434 else if (valid0
== valid1
&& valid0
!= 0)
4435 ret
= null_pointer_node
;
4436 /* Since GCC guarantees that string constants are unique in the
4437 generated code, a subtraction between two copies of the same
4438 constant string is absolute. */
4439 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4440 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4441 && operand_equal_p (valid0
, valid1
, 1))
4442 ret
= null_pointer_node
;
4443 /* Support narrowing differences. */
4445 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4449 /* Support narrowing differences. */
4450 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4465 /* Return nonzero if VALUE is a valid constant-valued expression
4466 for use in initializing a static variable; one that can be an
4467 element of a "constant" initializer.
4469 Return null_pointer_node if the value is absolute;
4470 if it is relocatable, return the variable that determines the relocation.
4471 We assume that VALUE has been folded as much as possible;
4472 therefore, we do not need to check for such things as
4473 arithmetic-combinations of integers. */
4475 initializer_constant_valid_p (tree value
, tree endtype
)
4477 return initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4480 /* Return true if VALUE is a valid constant-valued expression
4481 for use in initializing a static bit-field; one that can be
4482 an element of a "constant" initializer. */
4485 initializer_constant_valid_for_bitfield_p (tree value
)
4487 /* For bitfields we support integer constants or possibly nested aggregates
4489 switch (TREE_CODE (value
))
4493 unsigned HOST_WIDE_INT idx
;
4496 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4497 if (!initializer_constant_valid_for_bitfield_p (elt
))
4506 case VIEW_CONVERT_EXPR
:
4507 case NON_LVALUE_EXPR
:
4509 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4518 /* output_constructor outer state of relevance in recursive calls, typically
4519 for nested aggregate bitfields. */
4522 unsigned int bit_offset
; /* current position in ... */
4523 int byte
; /* ... the outer byte buffer. */
4526 static unsigned HOST_WIDE_INT
4527 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int,
4530 /* Output assembler code for constant EXP, with no label.
4531 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4532 Assumes output_addressed_constants has been done on EXP already.
4534 Generate at least SIZE bytes of assembler data, padding at the end
4535 with zeros if necessary. SIZE must always be specified. The returned
4536 value is the actual number of bytes of assembler data generated, which
4537 may be bigger than SIZE if the object contains a variable length field.
4539 SIZE is important for structure constructors,
4540 since trailing members may have been omitted from the constructor.
4541 It is also important for initialization of arrays from string constants
4542 since the full length of the string constant might not be wanted.
4543 It is also needed for initialization of unions, where the initializer's
4544 type is just one member, and that may not be as long as the union.
4546 There a case in which we would fail to output exactly SIZE bytes:
4547 for a structure constructor that wants to produce more than SIZE bytes.
4548 But such constructors will never be generated for any possible input.
4550 ALIGN is the alignment of the data in bits. */
4552 static unsigned HOST_WIDE_INT
4553 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4555 enum tree_code code
;
4556 unsigned HOST_WIDE_INT thissize
;
4558 if (size
== 0 || flag_syntax_only
)
4561 /* See if we're trying to initialize a pointer in a non-default mode
4562 to the address of some declaration somewhere. If the target says
4563 the mode is valid for pointers, assume the target has a way of
4565 if (TREE_CODE (exp
) == NOP_EXPR
4566 && POINTER_TYPE_P (TREE_TYPE (exp
))
4567 && targetm
.addr_space
.valid_pointer_mode
4568 (TYPE_MODE (TREE_TYPE (exp
)),
4569 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4571 tree saved_type
= TREE_TYPE (exp
);
4573 /* Peel off any intermediate conversions-to-pointer for valid
4575 while (TREE_CODE (exp
) == NOP_EXPR
4576 && POINTER_TYPE_P (TREE_TYPE (exp
))
4577 && targetm
.addr_space
.valid_pointer_mode
4578 (TYPE_MODE (TREE_TYPE (exp
)),
4579 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4580 exp
= TREE_OPERAND (exp
, 0);
4582 /* If what we're left with is the address of something, we can
4583 convert the address to the final type and output it that
4585 if (TREE_CODE (exp
) == ADDR_EXPR
)
4586 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4587 /* Likewise for constant ints. */
4588 else if (TREE_CODE (exp
) == INTEGER_CST
)
4589 exp
= wide_int_to_tree (saved_type
, exp
);
4593 /* Eliminate any conversions since we'll be outputting the underlying
4595 while (CONVERT_EXPR_P (exp
)
4596 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4597 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4599 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4600 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4602 /* Make sure eliminating the conversion is really a no-op, except with
4603 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4604 union types to allow for Ada unchecked unions. */
4605 if (type_size
> op_size
4606 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4607 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4608 /* Keep the conversion. */
4611 exp
= TREE_OPERAND (exp
, 0);
4614 code
= TREE_CODE (TREE_TYPE (exp
));
4615 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4617 /* Allow a constructor with no elements for any data type.
4618 This means to fill the space with zeros. */
4619 if (TREE_CODE (exp
) == CONSTRUCTOR
4620 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4622 assemble_zeros (size
);
4626 if (TREE_CODE (exp
) == FDESC_EXPR
)
4628 #ifdef ASM_OUTPUT_FDESC
4629 HOST_WIDE_INT part
= tree_to_shwi (TREE_OPERAND (exp
, 1));
4630 tree decl
= TREE_OPERAND (exp
, 0);
4631 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4638 /* Now output the underlying data. If we've handling the padding, return.
4639 Otherwise, break and ensure SIZE is the size written. */
4646 case REFERENCE_TYPE
:
4648 case FIXED_POINT_TYPE
:
4650 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4651 EXPAND_INITIALIZER
),
4652 MIN (size
, thissize
), align
, 0))
4653 error ("initializer for integer/fixed-point value is too complicated");
4657 if (TREE_CODE (exp
) != REAL_CST
)
4658 error ("initializer for floating value is not a floating constant");
4660 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4664 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4665 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4666 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4671 switch (TREE_CODE (exp
))
4674 return output_constructor (exp
, size
, align
, NULL
);
4677 = MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
), size
);
4678 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4682 enum machine_mode inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4683 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4684 int elt_size
= GET_MODE_SIZE (inner
);
4685 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
);
4686 thissize
= elt_size
;
4687 for (unsigned int i
= 1; i
< VECTOR_CST_NELTS (exp
); i
++)
4689 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
);
4690 thissize
+= elt_size
;
4701 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4702 return output_constructor (exp
, size
, align
, NULL
);
4711 if (size
> thissize
)
4712 assemble_zeros (size
- thissize
);
4718 /* Subroutine of output_constructor, used for computing the size of
4719 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4720 type with an unspecified upper bound. */
4722 static unsigned HOST_WIDE_INT
4723 array_size_for_constructor (tree val
)
4726 unsigned HOST_WIDE_INT cnt
;
4727 tree index
, value
, tmp
;
4730 /* This code used to attempt to handle string constants that are not
4731 arrays of single-bytes, but nothing else does, so there's no point in
4733 if (TREE_CODE (val
) == STRING_CST
)
4734 return TREE_STRING_LENGTH (val
);
4736 max_index
= NULL_TREE
;
4737 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4739 if (TREE_CODE (index
) == RANGE_EXPR
)
4740 index
= TREE_OPERAND (index
, 1);
4741 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4745 if (max_index
== NULL_TREE
)
4748 /* Compute the total number of array elements. */
4749 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4750 i
= wi::to_offset (max_index
) - wi::to_offset (tmp
) + 1;
4752 /* Multiply by the array element unit size to find number of bytes. */
4753 i
*= wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4755 gcc_assert (wi::fits_uhwi_p (i
));
4756 return i
.to_uhwi ();
4759 /* Other datastructures + helpers for output_constructor. */
4761 /* output_constructor local state to support interaction with helpers. */
4765 /* Received arguments. */
4766 tree exp
; /* Constructor expression. */
4767 tree type
; /* Type of constructor expression. */
4768 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4769 unsigned int align
; /* Known initial alignment. */
4770 tree min_index
; /* Lower bound if specified for an array. */
4772 /* Output processing state. */
4773 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4774 int byte
; /* Part of a bitfield byte yet to be output. */
4775 int last_relative_index
; /* Implicit or explicit index of the last
4776 array element output within a bitfield. */
4777 bool byte_buffer_in_use
; /* Whether BYTE is in use. */
4779 /* Current element. */
4780 tree field
; /* Current field decl in a record. */
4781 tree val
; /* Current element value. */
4782 tree index
; /* Current element index. */
4786 /* Helper for output_constructor. From the current LOCAL state, output a
4787 RANGE_EXPR element. */
4790 output_constructor_array_range (oc_local_state
*local
)
4792 unsigned HOST_WIDE_INT fieldsize
4793 = int_size_in_bytes (TREE_TYPE (local
->type
));
4795 HOST_WIDE_INT lo_index
4796 = tree_to_shwi (TREE_OPERAND (local
->index
, 0));
4797 HOST_WIDE_INT hi_index
4798 = tree_to_shwi (TREE_OPERAND (local
->index
, 1));
4799 HOST_WIDE_INT index
;
4802 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4804 for (index
= lo_index
; index
<= hi_index
; index
++)
4806 /* Output the element's initial value. */
4807 if (local
->val
== NULL_TREE
)
4808 assemble_zeros (fieldsize
);
4810 fieldsize
= output_constant (local
->val
, fieldsize
, align2
);
4812 /* Count its size. */
4813 local
->total_bytes
+= fieldsize
;
4817 /* Helper for output_constructor. From the current LOCAL state, output a
4818 field element that is not true bitfield or part of an outer one. */
4821 output_constructor_regular_field (oc_local_state
*local
)
4823 /* Field size and position. Since this structure is static, we know the
4824 positions are constant. */
4825 unsigned HOST_WIDE_INT fieldsize
;
4826 HOST_WIDE_INT fieldpos
;
4828 unsigned int align2
;
4830 if (local
->index
!= NULL_TREE
)
4832 /* Perform the index calculation in modulo arithmetic but
4833 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4834 but we are using an unsigned sizetype. */
4835 unsigned prec
= TYPE_PRECISION (sizetype
);
4836 offset_int idx
= wi::sext (wi::to_offset (local
->index
)
4837 - wi::to_offset (local
->min_index
), prec
);
4838 fieldpos
= (idx
* wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
))))
4841 else if (local
->field
!= NULL_TREE
)
4842 fieldpos
= int_byte_position (local
->field
);
4846 /* Output any buffered-up bit-fields preceding this element. */
4847 if (local
->byte_buffer_in_use
)
4849 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4850 local
->total_bytes
++;
4851 local
->byte_buffer_in_use
= false;
4854 /* Advance to offset of this element.
4855 Note no alignment needed in an array, since that is guaranteed
4856 if each element has the proper size. */
4857 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4858 && fieldpos
> local
->total_bytes
)
4860 assemble_zeros (fieldpos
- local
->total_bytes
);
4861 local
->total_bytes
= fieldpos
;
4864 /* Find the alignment of this element. */
4865 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
4867 /* Determine size this element should occupy. */
4872 /* If this is an array with an unspecified upper bound,
4873 the initializer determines the size. */
4874 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4875 but we cannot do this until the deprecated support for
4876 initializing zero-length array members is removed. */
4877 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
4878 && TYPE_DOMAIN (TREE_TYPE (local
->field
))
4879 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
))))
4881 fieldsize
= array_size_for_constructor (local
->val
);
4882 /* Given a non-empty initialization, this field had
4884 gcc_assert (!fieldsize
|| !DECL_CHAIN (local
->field
));
4887 fieldsize
= tree_to_uhwi (DECL_SIZE_UNIT (local
->field
));
4890 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
4892 /* Output the element's initial value. */
4893 if (local
->val
== NULL_TREE
)
4894 assemble_zeros (fieldsize
);
4896 fieldsize
= output_constant (local
->val
, fieldsize
, align2
);
4898 /* Count its size. */
4899 local
->total_bytes
+= fieldsize
;
4902 /* Helper for output_constructor. From the LOCAL state, output an element
4903 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
4904 from the start of a possibly ongoing outer byte buffer. */
4907 output_constructor_bitfield (oc_local_state
*local
, unsigned int bit_offset
)
4909 /* Bit size of this element. */
4910 HOST_WIDE_INT ebitsize
4912 ? tree_to_uhwi (DECL_SIZE (local
->field
))
4913 : tree_to_uhwi (TYPE_SIZE (TREE_TYPE (local
->type
))));
4915 /* Relative index of this element if this is an array component. */
4916 HOST_WIDE_INT relative_index
4919 ? (tree_to_shwi (local
->index
)
4920 - tree_to_shwi (local
->min_index
))
4921 : local
->last_relative_index
+ 1)
4924 /* Bit position of this element from the start of the containing
4926 HOST_WIDE_INT constructor_relative_ebitpos
4928 ? int_bit_position (local
->field
)
4929 : ebitsize
* relative_index
);
4931 /* Bit position of this element from the start of a possibly ongoing
4932 outer byte buffer. */
4933 HOST_WIDE_INT byte_relative_ebitpos
4934 = bit_offset
+ constructor_relative_ebitpos
;
4936 /* From the start of a possibly ongoing outer byte buffer, offsets to
4937 the first bit of this element and to the first bit past the end of
4939 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
4940 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
4942 local
->last_relative_index
= relative_index
;
4944 if (local
->val
== NULL_TREE
)
4945 local
->val
= integer_zero_node
;
4947 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
4948 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
4949 local
->val
= TREE_OPERAND (local
->val
, 0);
4951 if (TREE_CODE (local
->val
) != INTEGER_CST
4952 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
4954 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
4958 /* If this field does not start in this (or next) byte, skip some bytes. */
4959 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4961 /* Output remnant of any bit field in previous bytes. */
4962 if (local
->byte_buffer_in_use
)
4964 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4965 local
->total_bytes
++;
4966 local
->byte_buffer_in_use
= false;
4969 /* If still not at proper byte, advance to there. */
4970 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4972 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
4973 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
4974 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
4978 /* Set up the buffer if necessary. */
4979 if (!local
->byte_buffer_in_use
)
4983 local
->byte_buffer_in_use
= true;
4986 /* If this is nested constructor, recurse passing the bit offset and the
4987 pending data, then retrieve the new pending data afterwards. */
4988 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
4990 oc_outer_state temp_state
;
4991 temp_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
4992 temp_state
.byte
= local
->byte
;
4994 += output_constructor (local
->val
, 0, 0, &temp_state
);
4995 local
->byte
= temp_state
.byte
;
4999 /* Otherwise, we must split the element into pieces that fall within
5000 separate bytes, and combine each byte with previous or following
5002 while (next_offset
< end_offset
)
5006 HOST_WIDE_INT value
;
5007 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
5008 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
5010 /* Advance from byte to byte within this element when necessary. */
5011 while (next_byte
!= local
->total_bytes
)
5013 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5014 local
->total_bytes
++;
5018 /* Number of bits we can process at once (all part of the same byte). */
5019 this_time
= MIN (end_offset
- next_offset
, BITS_PER_UNIT
- next_bit
);
5020 if (BYTES_BIG_ENDIAN
)
5022 /* On big-endian machine, take the most significant bits (of the
5023 bits that are significant) first and put them into bytes from
5024 the most significant end. */
5025 shift
= end_offset
- next_offset
- this_time
;
5027 /* Don't try to take a bunch of bits that cross
5028 the word boundary in the INTEGER_CST. We can
5029 only select bits from one element. */
5030 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5031 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5033 const int end
= shift
+ this_time
- 1;
5034 shift
= end
& -HOST_BITS_PER_WIDE_INT
;
5035 this_time
= end
- shift
+ 1;
5038 /* Now get the bits from the appropriate constant word. */
5039 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5040 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5042 /* Get the result. This works only when:
5043 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5044 local
->byte
|= (((value
>> shift
)
5045 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5046 << (BITS_PER_UNIT
- this_time
- next_bit
));
5050 /* On little-endian machines, take the least significant bits of
5051 the value first and pack them starting at the least significant
5052 bits of the bytes. */
5053 shift
= next_offset
- byte_relative_ebitpos
;
5055 /* Don't try to take a bunch of bits that cross
5056 the word boundary in the INTEGER_CST. We can
5057 only select bits from one element. */
5058 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5059 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5061 = HOST_BITS_PER_WIDE_INT
- (shift
& (HOST_BITS_PER_WIDE_INT
- 1));
5063 /* Now get the bits from the appropriate constant word. */
5064 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5065 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5067 /* Get the result. This works only when:
5068 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5069 local
->byte
|= (((value
>> shift
)
5070 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5074 next_offset
+= this_time
;
5075 local
->byte_buffer_in_use
= true;
5079 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5080 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5081 caller output state of relevance in recursive invocations. */
5083 static unsigned HOST_WIDE_INT
5084 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
5085 unsigned int align
, oc_outer_state
*outer
)
5087 unsigned HOST_WIDE_INT cnt
;
5088 constructor_elt
*ce
;
5090 oc_local_state local
;
5092 /* Setup our local state to communicate with helpers. */
5094 local
.type
= TREE_TYPE (exp
);
5096 local
.align
= align
;
5097 if (TREE_CODE (local
.type
) == ARRAY_TYPE
&& TYPE_DOMAIN (local
.type
))
5098 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5100 local
.min_index
= NULL_TREE
;
5102 local
.total_bytes
= 0;
5103 local
.byte_buffer_in_use
= outer
!= NULL
;
5104 local
.byte
= outer
? outer
->byte
: 0;
5105 local
.last_relative_index
= -1;
5107 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5109 /* As CE goes through the elements of the constant, FIELD goes through the
5110 structure fields if the constant is a structure. If the constant is a
5111 union, we override this by getting the field from the TREE_LIST element.
5112 But the constant could also be an array. Then FIELD is zero.
5114 There is always a maximum of one element in the chain LINK for unions
5115 (even if the initializer in a source program incorrectly contains
5118 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5119 local
.field
= TYPE_FIELDS (local
.type
);
5121 local
.field
= NULL_TREE
;
5124 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5125 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5127 local
.val
= ce
->value
;
5128 local
.index
= NULL_TREE
;
5130 /* The element in a union constructor specifies the proper field
5132 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5133 local
.field
= ce
->index
;
5135 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5136 local
.index
= ce
->index
;
5138 if (local
.field
&& flag_verbose_asm
)
5139 fprintf (asm_out_file
, "%s %s:\n",
5141 DECL_NAME (local
.field
)
5142 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5145 /* Eliminate the marker that makes a cast not be an lvalue. */
5146 if (local
.val
!= NULL_TREE
)
5147 STRIP_NOPS (local
.val
);
5149 /* Output the current element, using the appropriate helper ... */
5151 /* For an array slice not part of an outer bitfield. */
5153 && local
.index
!= NULL_TREE
5154 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5155 output_constructor_array_range (&local
);
5157 /* For a field that is neither a true bitfield nor part of an outer one,
5158 known to be at least byte aligned and multiple-of-bytes long. */
5160 && (local
.field
== NULL_TREE
5161 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5162 output_constructor_regular_field (&local
);
5164 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5165 supported for scalar fields, so we may need to convert first. */
5168 if (TREE_CODE (local
.val
) == REAL_CST
)
5170 = fold_unary (VIEW_CONVERT_EXPR
,
5171 build_nonstandard_integer_type
5172 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5174 output_constructor_bitfield (&local
, outer
? outer
->bit_offset
: 0);
5178 /* If we are not at toplevel, save the pending data for our caller.
5179 Otherwise output the pending data and padding zeros as needed. */
5181 outer
->byte
= local
.byte
;
5184 if (local
.byte_buffer_in_use
)
5186 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5187 local
.total_bytes
++;
5190 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5192 assemble_zeros (local
.size
- local
.total_bytes
);
5193 local
.total_bytes
= local
.size
;
5197 return local
.total_bytes
;
5200 /* Mark DECL as weak. */
5203 mark_weak (tree decl
)
5205 DECL_WEAK (decl
) = 1;
5207 if (DECL_RTL_SET_P (decl
)
5208 && MEM_P (DECL_RTL (decl
))
5209 && XEXP (DECL_RTL (decl
), 0)
5210 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5211 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5214 /* Merge weak status between NEWDECL and OLDDECL. */
5217 merge_weak (tree newdecl
, tree olddecl
)
5219 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5221 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5224 /* We put the NEWDECL on the weak_decls list at some point
5225 and OLDDECL as well. Keep just OLDDECL on the list. */
5226 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5227 if (TREE_VALUE (*pwd
) == newdecl
)
5229 *pwd
= TREE_CHAIN (*pwd
);
5236 if (DECL_WEAK (newdecl
))
5240 /* NEWDECL is weak, but OLDDECL is not. */
5242 /* If we already output the OLDDECL, we're in trouble; we can't
5243 go back and make it weak. This should never happen in
5244 unit-at-a-time compilation. */
5245 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5247 /* If we've already generated rtl referencing OLDDECL, we may
5248 have done so in a way that will not function properly with
5249 a weak symbol. Again in unit-at-a-time this should be
5251 gcc_assert (!TREE_USED (olddecl
)
5252 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5254 if (TARGET_SUPPORTS_WEAK
)
5256 /* We put the NEWDECL on the weak_decls list at some point.
5257 Replace it with the OLDDECL. */
5258 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5259 if (TREE_VALUE (wd
) == newdecl
)
5261 TREE_VALUE (wd
) = olddecl
;
5264 /* We may not find the entry on the list. If NEWDECL is a
5265 weak alias, then we will have already called
5266 globalize_decl to remove the entry; in that case, we do
5267 not need to do anything. */
5270 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5271 mark_weak (olddecl
);
5274 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5275 weak. Just update NEWDECL to indicate that it's weak too. */
5276 mark_weak (newdecl
);
5279 /* Declare DECL to be a weak symbol. */
5282 declare_weak (tree decl
)
5284 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5285 if (! TREE_PUBLIC (decl
))
5286 error ("weak declaration of %q+D must be public", decl
);
5287 else if (!TARGET_SUPPORTS_WEAK
)
5288 warning (0, "weak declaration of %q+D not supported", decl
);
5291 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5292 DECL_ATTRIBUTES (decl
)
5293 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5297 weak_finish_1 (tree decl
)
5299 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5300 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5303 if (! TREE_USED (decl
))
5306 #ifdef ASM_WEAKEN_DECL
5307 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5309 #ifdef ASM_WEAKEN_LABEL
5310 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5312 #ifdef ASM_OUTPUT_WEAK_ALIAS
5314 static bool warn_once
= 0;
5317 warning (0, "only weak aliases are supported in this configuration");
5327 /* Fiven an assembly name, find the decl it is associated with. */
5329 find_decl (tree target
)
5331 symtab_node
*node
= symtab_node_for_asm (target
);
5337 /* This TREE_LIST contains weakref targets. */
5339 static GTY(()) tree weakref_targets
;
5341 /* Emit any pending weak declarations. */
5348 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5350 tree alias_decl
= TREE_PURPOSE (t
);
5351 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5353 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5354 /* Remove alias_decl from the weak list, but leave entries for
5355 the target alone. */
5357 #ifndef ASM_OUTPUT_WEAKREF
5358 else if (! TREE_SYMBOL_REFERENCED (target
))
5360 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5361 defined, otherwise we and weak_finish_1 would use
5362 different macros. */
5363 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5364 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5366 tree decl
= find_decl (target
);
5370 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5371 TREE_CODE (alias_decl
), target
,
5372 TREE_TYPE (alias_decl
));
5374 DECL_EXTERNAL (decl
) = 1;
5375 TREE_PUBLIC (decl
) = 1;
5376 DECL_ARTIFICIAL (decl
) = 1;
5377 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5378 TREE_USED (decl
) = 1;
5381 weak_finish_1 (decl
);
5390 /* Remove the alias and the target from the pending weak list
5391 so that we do not emit any .weak directives for the former,
5392 nor multiple .weak directives for the latter. */
5393 for (p
= &weak_decls
; (t2
= *p
) ; )
5395 if (TREE_VALUE (t2
) == alias_decl
5396 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5397 *p
= TREE_CHAIN (t2
);
5399 p
= &TREE_CHAIN (t2
);
5402 /* Remove other weakrefs to the same target, to speed things up. */
5403 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5405 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5406 *p
= TREE_CHAIN (t2
);
5408 p
= &TREE_CHAIN (t2
);
5413 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5415 tree decl
= TREE_VALUE (t
);
5417 weak_finish_1 (decl
);
5421 /* Emit the assembly bits to indicate that DECL is globally visible. */
5424 globalize_decl (tree decl
)
5427 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5428 if (DECL_WEAK (decl
))
5430 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5433 #ifdef ASM_WEAKEN_DECL
5434 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5436 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5439 /* Remove this function from the pending weak list so that
5440 we do not emit multiple .weak directives for it. */
5441 for (p
= &weak_decls
; (t
= *p
) ; )
5443 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5444 *p
= TREE_CHAIN (t
);
5446 p
= &TREE_CHAIN (t
);
5449 /* Remove weakrefs to the same target from the pending weakref
5450 list, for the same reason. */
5451 for (p
= &weakref_targets
; (t
= *p
) ; )
5453 if (DECL_ASSEMBLER_NAME (decl
)
5454 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5455 *p
= TREE_CHAIN (t
);
5457 p
= &TREE_CHAIN (t
);
5464 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5467 vec
<alias_pair
, va_gc
> *alias_pairs
;
5469 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5470 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5471 tree node is DECL to have the value of the tree node TARGET. */
5474 do_assemble_alias (tree decl
, tree target
)
5476 /* Emulated TLS had better not get this var. */
5477 gcc_assert (!(!targetm
.have_tls
5478 && TREE_CODE (decl
) == VAR_DECL
5479 && DECL_THREAD_LOCAL_P (decl
)));
5481 if (TREE_ASM_WRITTEN (decl
))
5484 /* We must force creation of DECL_RTL for debug info generation, even though
5485 we don't use it here. */
5486 make_decl_rtl (decl
);
5488 TREE_ASM_WRITTEN (decl
) = 1;
5489 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5491 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5493 ultimate_transparent_alias_target (&target
);
5495 if (!TREE_SYMBOL_REFERENCED (target
))
5496 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5498 #ifdef ASM_OUTPUT_WEAKREF
5499 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5500 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5501 IDENTIFIER_POINTER (target
));
5503 if (!TARGET_SUPPORTS_WEAK
)
5505 error_at (DECL_SOURCE_LOCATION (decl
),
5506 "weakref is not supported in this configuration");
5513 #ifdef ASM_OUTPUT_DEF
5514 /* Make name accessible from other files, if appropriate. */
5516 if (TREE_PUBLIC (decl
))
5518 globalize_decl (decl
);
5519 maybe_assemble_visibility (decl
);
5521 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5523 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5524 if (targetm
.has_ifunc_p ())
5525 ASM_OUTPUT_TYPE_DIRECTIVE
5526 (asm_out_file
, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5530 error_at (DECL_SOURCE_LOCATION (decl
),
5531 "ifunc is not supported on this target");
5534 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5535 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5537 ASM_OUTPUT_DEF (asm_out_file
,
5538 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5539 IDENTIFIER_POINTER (target
));
5541 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5546 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5547 # ifdef ASM_WEAKEN_DECL
5548 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5550 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5552 /* Remove this function from the pending weak list so that
5553 we do not emit multiple .weak directives for it. */
5554 for (p
= &weak_decls
; (t
= *p
) ; )
5555 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5556 *p
= TREE_CHAIN (t
);
5558 p
= &TREE_CHAIN (t
);
5560 /* Remove weakrefs to the same target from the pending weakref
5561 list, for the same reason. */
5562 for (p
= &weakref_targets
; (t
= *p
) ; )
5564 if (DECL_ASSEMBLER_NAME (decl
)
5565 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5566 *p
= TREE_CHAIN (t
);
5568 p
= &TREE_CHAIN (t
);
5574 /* Emit an assembler directive to make the symbol for DECL an alias to
5575 the symbol for TARGET. */
5578 assemble_alias (tree decl
, tree target
)
5582 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5584 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5586 ultimate_transparent_alias_target (&target
);
5588 if (alias
== target
)
5589 error ("weakref %q+D ultimately targets itself", decl
);
5590 if (TREE_PUBLIC (decl
))
5591 error ("weakref %q+D must have static linkage", decl
);
5595 #if !defined (ASM_OUTPUT_DEF)
5596 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5597 error_at (DECL_SOURCE_LOCATION (decl
),
5598 "alias definitions not supported in this configuration");
5599 TREE_ASM_WRITTEN (decl
) = 1;
5602 if (!DECL_WEAK (decl
))
5604 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5605 error_at (DECL_SOURCE_LOCATION (decl
),
5606 "ifunc is not supported in this configuration");
5608 error_at (DECL_SOURCE_LOCATION (decl
),
5609 "only weak aliases are supported in this configuration");
5610 TREE_ASM_WRITTEN (decl
) = 1;
5616 TREE_USED (decl
) = 1;
5618 /* Allow aliases to aliases. */
5619 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5620 cgraph_get_create_node (decl
)->alias
= true;
5622 varpool_node_for_decl (decl
)->alias
= true;
5624 /* If the target has already been emitted, we don't have to queue the
5625 alias. This saves a tad of memory. */
5626 if (cgraph_global_info_ready
)
5627 target_decl
= find_decl (target
);
5630 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5631 || cgraph_state
>= CGRAPH_STATE_EXPANSION
)
5632 do_assemble_alias (decl
, target
);
5635 alias_pair p
= {decl
, target
};
5636 vec_safe_push (alias_pairs
, p
);
5640 /* Record and output a table of translations from original function
5641 to its transaction aware clone. Note that tm_pure functions are
5642 considered to be their own clone. */
5644 static GTY((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
5645 htab_t tm_clone_hash
;
5648 record_tm_clone_pair (tree o
, tree n
)
5650 struct tree_map
**slot
, *h
;
5652 if (tm_clone_hash
== NULL
)
5653 tm_clone_hash
= htab_create_ggc (32, tree_map_hash
, tree_map_eq
, 0);
5655 h
= ggc_alloc
<tree_map
> ();
5656 h
->hash
= htab_hash_pointer (o
);
5660 slot
= (struct tree_map
**)
5661 htab_find_slot_with_hash (tm_clone_hash
, h
, h
->hash
, INSERT
);
5666 get_tm_clone_pair (tree o
)
5670 struct tree_map
*h
, in
;
5673 in
.hash
= htab_hash_pointer (o
);
5674 h
= (struct tree_map
*) htab_find_with_hash (tm_clone_hash
,
5682 typedef struct tm_alias_pair
5690 /* Helper function for finish_tm_clone_pairs. Dump a hash table entry
5691 into a VEC in INFO. */
5694 dump_tm_clone_to_vec (void **slot
, void *info
)
5696 struct tree_map
*map
= (struct tree_map
*) *slot
;
5697 vec
<tm_alias_pair
> *tm_alias_pairs
= (vec
<tm_alias_pair
> *) info
;
5698 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5699 tm_alias_pairs
->safe_push (p
);
5703 /* Dump the actual pairs to the .tm_clone_table section. */
5706 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5710 bool switched
= false;
5712 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5716 struct cgraph_node
*src_n
= cgraph_get_node (src
);
5717 struct cgraph_node
*dst_n
= cgraph_get_node (dst
);
5719 /* The function ipa_tm_create_version() marks the clone as needed if
5720 the original function was needed. But we also mark the clone as
5721 needed if we ever called the clone indirectly through
5722 TM_GETTMCLONE. If neither of these are true, we didn't generate
5723 a clone, and we didn't call it indirectly... no sense keeping it
5724 in the clone table. */
5725 if (!dst_n
|| !dst_n
->definition
)
5728 /* This covers the case where we have optimized the original
5729 function away, and only access the transactional clone. */
5730 if (!src_n
|| !src_n
->definition
)
5735 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5736 assemble_align (POINTER_SIZE
);
5740 assemble_integer (XEXP (DECL_RTL (src
), 0),
5741 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5742 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5743 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5747 /* Provide a default for the tm_clone_table section. */
5750 default_clone_table_section (void)
5752 return get_named_section (NULL
, ".tm_clone_table", 3);
5755 /* Helper comparison function for qsorting by the DECL_UID stored in
5756 alias_pair->emitted_diags. */
5759 tm_alias_pair_cmp (const void *x
, const void *y
)
5761 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5762 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5763 if (p1
->uid
< p2
->uid
)
5765 if (p1
->uid
> p2
->uid
)
5771 finish_tm_clone_pairs (void)
5773 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5775 if (tm_clone_hash
== NULL
)
5778 /* We need a determenistic order for the .tm_clone_table, otherwise
5779 we will get bootstrap comparison failures, so dump the hash table
5780 to a vector, sort it, and dump the vector. */
5782 /* Dump the hashtable to a vector. */
5783 htab_traverse_noresize (tm_clone_hash
, dump_tm_clone_to_vec
,
5784 (void *) &tm_alias_pairs
);
5786 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5789 dump_tm_clone_pairs (tm_alias_pairs
);
5791 htab_delete (tm_clone_hash
);
5792 tm_clone_hash
= NULL
;
5793 tm_alias_pairs
.release ();
5797 /* Emit an assembler directive to set symbol for DECL visibility to
5798 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5801 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5802 int vis ATTRIBUTE_UNUSED
)
5804 #ifdef HAVE_GAS_HIDDEN
5805 static const char * const visibility_types
[] = {
5806 NULL
, "protected", "hidden", "internal"
5809 const char *name
, *type
;
5811 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5812 type
= visibility_types
[vis
];
5814 fprintf (asm_out_file
, "\t.%s\t", type
);
5815 assemble_name (asm_out_file
, name
);
5816 fprintf (asm_out_file
, "\n");
5818 if (!DECL_ARTIFICIAL (decl
))
5819 warning (OPT_Wattributes
, "visibility attribute not supported "
5820 "in this configuration; ignored");
5824 /* A helper function to call assemble_visibility when needed for a decl. */
5827 maybe_assemble_visibility (tree decl
)
5829 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5831 if (vis
!= VISIBILITY_DEFAULT
)
5833 targetm
.asm_out
.assemble_visibility (decl
, vis
);
5840 /* Returns 1 if the target configuration supports defining public symbols
5841 so that one of them will be chosen at link time instead of generating a
5842 multiply-defined symbol error, whether through the use of weak symbols or
5843 a target-specific mechanism for having duplicates discarded. */
5846 supports_one_only (void)
5848 if (SUPPORTS_ONE_ONLY
)
5850 return TARGET_SUPPORTS_WEAK
;
5853 /* Set up DECL as a public symbol that can be defined in multiple
5854 translation units without generating a linker error. */
5857 make_decl_one_only (tree decl
, tree comdat_group
)
5859 struct symtab_node
*symbol
;
5860 gcc_assert (TREE_CODE (decl
) == VAR_DECL
5861 || TREE_CODE (decl
) == FUNCTION_DECL
);
5863 TREE_PUBLIC (decl
) = 1;
5865 if (TREE_CODE (decl
) == VAR_DECL
)
5866 symbol
= varpool_node_for_decl (decl
);
5868 symbol
= cgraph_get_create_node (decl
);
5870 if (SUPPORTS_ONE_ONLY
)
5872 #ifdef MAKE_DECL_ONE_ONLY
5873 MAKE_DECL_ONE_ONLY (decl
);
5875 symbol
->set_comdat_group (comdat_group
);
5877 else if (TREE_CODE (decl
) == VAR_DECL
5878 && (DECL_INITIAL (decl
) == 0 || DECL_INITIAL (decl
) == error_mark_node
))
5879 DECL_COMMON (decl
) = 1;
5882 gcc_assert (TARGET_SUPPORTS_WEAK
);
5883 DECL_WEAK (decl
) = 1;
5888 init_varasm_once (void)
5890 section_htab
= htab_create_ggc (31, section_entry_hash
,
5891 section_entry_eq
, NULL
);
5892 object_block_htab
= htab_create_ggc (31, object_block_entry_hash
,
5893 object_block_entry_eq
, NULL
);
5894 const_desc_htab
= htab_create_ggc (1009, const_desc_hash
,
5895 const_desc_eq
, NULL
);
5897 const_alias_set
= new_alias_set ();
5898 shared_constant_pool
= create_constant_pool ();
5900 #ifdef TEXT_SECTION_ASM_OP
5901 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
5902 TEXT_SECTION_ASM_OP
);
5905 #ifdef DATA_SECTION_ASM_OP
5906 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5907 DATA_SECTION_ASM_OP
);
5910 #ifdef SDATA_SECTION_ASM_OP
5911 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5912 SDATA_SECTION_ASM_OP
);
5915 #ifdef READONLY_DATA_SECTION_ASM_OP
5916 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
5917 READONLY_DATA_SECTION_ASM_OP
);
5920 #ifdef CTORS_SECTION_ASM_OP
5921 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
5922 CTORS_SECTION_ASM_OP
);
5925 #ifdef DTORS_SECTION_ASM_OP
5926 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
5927 DTORS_SECTION_ASM_OP
);
5930 #ifdef BSS_SECTION_ASM_OP
5931 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5932 output_section_asm_op
,
5933 BSS_SECTION_ASM_OP
);
5936 #ifdef SBSS_SECTION_ASM_OP
5937 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5938 output_section_asm_op
,
5939 SBSS_SECTION_ASM_OP
);
5942 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5943 | SECTION_COMMON
, emit_tls_common
);
5944 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5945 | SECTION_COMMON
, emit_local
);
5946 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5947 | SECTION_COMMON
, emit_common
);
5949 #if defined ASM_OUTPUT_ALIGNED_BSS
5950 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
5954 targetm
.asm_out
.init_sections ();
5956 if (readonly_data_section
== NULL
)
5957 readonly_data_section
= text_section
;
5959 #ifdef ASM_OUTPUT_EXTERNAL
5960 pending_assemble_externals_set
= pointer_set_create ();
5965 decl_default_tls_model (const_tree decl
)
5967 enum tls_model kind
;
5970 is_local
= targetm
.binds_local_p (decl
);
5974 kind
= TLS_MODEL_LOCAL_EXEC
;
5976 kind
= TLS_MODEL_INITIAL_EXEC
;
5979 /* Local dynamic is inefficient when we're not combining the
5980 parts of the address. */
5981 else if (optimize
&& is_local
)
5982 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
5984 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
5985 if (kind
< flag_tls_default
)
5986 kind
= flag_tls_default
;
5991 /* Select a set of attributes for section NAME based on the properties
5992 of DECL and whether or not RELOC indicates that DECL's initializer
5993 might contain runtime relocations.
5995 We make the section read-only and executable for a function decl,
5996 read-only for a const data decl, and writable for a non-const data decl. */
5999 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6003 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6004 flags
= SECTION_CODE
;
6007 enum section_category category
6008 = categorize_decl_for_section (decl
, reloc
);
6009 if (decl_readonly_section_1 (category
))
6011 else if (category
== SECCAT_DATA_REL_RO
6012 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6013 flags
= SECTION_WRITE
| SECTION_RELRO
;
6015 flags
= SECTION_WRITE
;
6019 flags
= SECTION_WRITE
;
6020 if (strcmp (name
, ".data.rel.ro") == 0
6021 || strcmp (name
, ".data.rel.ro.local") == 0)
6022 flags
|= SECTION_RELRO
;
6025 if (decl
&& DECL_P (decl
) && DECL_COMDAT_GROUP (decl
))
6026 flags
|= SECTION_LINKONCE
;
6028 if (strcmp (name
, ".vtable_map_vars") == 0)
6029 flags
|= SECTION_LINKONCE
;
6031 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6032 flags
|= SECTION_TLS
| SECTION_WRITE
;
6034 if (strcmp (name
, ".bss") == 0
6035 || strncmp (name
, ".bss.", 5) == 0
6036 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6037 || strcmp (name
, ".sbss") == 0
6038 || strncmp (name
, ".sbss.", 6) == 0
6039 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6040 flags
|= SECTION_BSS
;
6042 if (strcmp (name
, ".tdata") == 0
6043 || strncmp (name
, ".tdata.", 7) == 0
6044 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6045 flags
|= SECTION_TLS
;
6047 if (strcmp (name
, ".tbss") == 0
6048 || strncmp (name
, ".tbss.", 6) == 0
6049 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6050 flags
|= SECTION_TLS
| SECTION_BSS
;
6052 /* These three sections have special ELF types. They are neither
6053 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6054 want to print a section type (@progbits or @nobits). If someone
6055 is silly enough to emit code or TLS variables to one of these
6056 sections, then don't handle them specially. */
6057 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6058 && (strcmp (name
, ".init_array") == 0
6059 || strcmp (name
, ".fini_array") == 0
6060 || strcmp (name
, ".preinit_array") == 0))
6061 flags
|= SECTION_NOTYPE
;
6066 /* Return true if the target supports some form of global BSS,
6067 either through bss_noswitch_section, or by selecting a BSS
6068 section in TARGET_ASM_SELECT_SECTION. */
6071 have_global_bss_p (void)
6073 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6076 /* Output assembly to switch to section NAME with attribute FLAGS.
6077 Four variants for common object file formats. */
6080 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6081 unsigned int flags ATTRIBUTE_UNUSED
,
6082 tree decl ATTRIBUTE_UNUSED
)
6084 /* Some object formats don't support named sections at all. The
6085 front-end should already have flagged this as an error. */
6089 #ifndef TLS_SECTION_ASM_FLAG
6090 #define TLS_SECTION_ASM_FLAG 'T'
6094 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6095 tree decl ATTRIBUTE_UNUSED
)
6097 char flagchars
[10], *f
= flagchars
;
6099 /* If we have already declared this section, we can use an
6100 abbreviated form to switch back to it -- unless this section is
6101 part of a COMDAT groups, in which case GAS requires the full
6102 declaration every time. */
6103 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6104 && (flags
& SECTION_DECLARED
))
6106 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6110 if (!(flags
& SECTION_DEBUG
))
6112 if (flags
& SECTION_EXCLUDE
)
6114 if (flags
& SECTION_WRITE
)
6116 if (flags
& SECTION_CODE
)
6118 if (flags
& SECTION_SMALL
)
6120 if (flags
& SECTION_MERGE
)
6122 if (flags
& SECTION_STRINGS
)
6124 if (flags
& SECTION_TLS
)
6125 *f
++ = TLS_SECTION_ASM_FLAG
;
6126 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6130 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6132 if (!(flags
& SECTION_NOTYPE
))
6137 if (flags
& SECTION_BSS
)
6143 /* On platforms that use "@" as the assembly comment character,
6145 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6147 fprintf (asm_out_file
, format
, type
);
6149 if (flags
& SECTION_ENTSIZE
)
6150 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6151 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6153 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6154 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6156 fprintf (asm_out_file
, ",%s,comdat",
6157 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6161 putc ('\n', asm_out_file
);
6165 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6166 tree decl ATTRIBUTE_UNUSED
)
6168 char flagchars
[8], *f
= flagchars
;
6170 if (flags
& SECTION_WRITE
)
6172 if (flags
& SECTION_CODE
)
6176 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6180 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6183 default_coff_asm_named_section (name
, flags
, decl
);
6185 if (flags
& SECTION_LINKONCE
)
6187 /* Functions may have been compiled at various levels of
6188 optimization so we can't use `same_size' here.
6189 Instead, have the linker pick one. */
6190 fprintf (asm_out_file
, "\t.linkonce %s\n",
6191 (flags
& SECTION_CODE
? "discard" : "same_size"));
6195 /* The lame default section selector. */
6198 default_select_section (tree decl
, int reloc
,
6199 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6203 if (decl_readonly_section (decl
, reloc
))
6204 return readonly_data_section
;
6206 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6208 if (! ((flag_pic
&& reloc
)
6209 || !TREE_READONLY (decl
)
6210 || TREE_SIDE_EFFECTS (decl
)
6211 || !TREE_CONSTANT (decl
)))
6212 return readonly_data_section
;
6214 else if (TREE_CODE (decl
) == STRING_CST
)
6215 return readonly_data_section
;
6216 else if (! (flag_pic
&& reloc
))
6217 return readonly_data_section
;
6219 return data_section
;
6222 enum section_category
6223 categorize_decl_for_section (const_tree decl
, int reloc
)
6225 enum section_category ret
;
6227 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6229 else if (TREE_CODE (decl
) == STRING_CST
)
6231 if ((flag_sanitize
& SANITIZE_ADDRESS
)
6232 && asan_protect_global (CONST_CAST_TREE (decl
)))
6233 /* or !flag_merge_constants */
6234 return SECCAT_RODATA
;
6236 return SECCAT_RODATA_MERGE_STR
;
6238 else if (TREE_CODE (decl
) == VAR_DECL
)
6240 if (bss_initializer_p (decl
))
6242 else if (! TREE_READONLY (decl
)
6243 || TREE_SIDE_EFFECTS (decl
)
6244 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6246 /* Here the reloc_rw_mask is not testing whether the section should
6247 be read-only or not, but whether the dynamic link will have to
6248 do something. If so, we wish to segregate the data in order to
6249 minimize cache misses inside the dynamic linker. */
6250 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6251 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6255 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6256 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6257 else if (reloc
|| flag_merge_constants
< 2
6258 || ((flag_sanitize
& SANITIZE_ADDRESS
)
6259 && asan_protect_global (CONST_CAST_TREE (decl
))))
6260 /* C and C++ don't allow different variables to share the same
6261 location. -fmerge-all-constants allows even that (at the
6262 expense of not conforming). */
6263 ret
= SECCAT_RODATA
;
6264 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6265 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6267 ret
= SECCAT_RODATA_MERGE_CONST
;
6269 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6271 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6272 || TREE_SIDE_EFFECTS (decl
)
6273 || ! TREE_CONSTANT (decl
))
6276 ret
= SECCAT_RODATA
;
6279 ret
= SECCAT_RODATA
;
6281 /* There are no read-only thread-local sections. */
6282 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6284 /* Note that this would be *just* SECCAT_BSS, except that there's
6285 no concept of a read-only thread-local-data section. */
6286 if (ret
== SECCAT_BSS
6287 || (flag_zero_initialized_in_bss
6288 && initializer_zerop (DECL_INITIAL (decl
))))
6294 /* If the target uses small data sections, select it. */
6295 else if (targetm
.in_small_data_p (decl
))
6297 if (ret
== SECCAT_BSS
)
6299 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6300 ret
= SECCAT_SRODATA
;
6309 decl_readonly_section_1 (enum section_category category
)
6314 case SECCAT_RODATA_MERGE_STR
:
6315 case SECCAT_RODATA_MERGE_STR_INIT
:
6316 case SECCAT_RODATA_MERGE_CONST
:
6317 case SECCAT_SRODATA
:
6325 decl_readonly_section (const_tree decl
, int reloc
)
6327 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6330 /* Select a section based on the above categorization. */
6333 default_elf_select_section (tree decl
, int reloc
,
6334 unsigned HOST_WIDE_INT align
)
6337 switch (categorize_decl_for_section (decl
, reloc
))
6340 /* We're not supposed to be called on FUNCTION_DECLs. */
6343 return readonly_data_section
;
6344 case SECCAT_RODATA_MERGE_STR
:
6345 return mergeable_string_section (decl
, align
, 0);
6346 case SECCAT_RODATA_MERGE_STR_INIT
:
6347 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6348 case SECCAT_RODATA_MERGE_CONST
:
6349 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6350 case SECCAT_SRODATA
:
6354 return data_section
;
6355 case SECCAT_DATA_REL
:
6356 sname
= ".data.rel";
6358 case SECCAT_DATA_REL_LOCAL
:
6359 sname
= ".data.rel.local";
6361 case SECCAT_DATA_REL_RO
:
6362 sname
= ".data.rel.ro";
6364 case SECCAT_DATA_REL_RO_LOCAL
:
6365 sname
= ".data.rel.ro.local";
6388 return get_named_section (decl
, sname
, reloc
);
6391 /* Construct a unique section name based on the decl name and the
6392 categorization performed above. */
6395 default_unique_section (tree decl
, int reloc
)
6397 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6398 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6399 const char *prefix
, *name
, *linkonce
;
6402 switch (categorize_decl_for_section (decl
, reloc
))
6405 prefix
= one_only
? ".t" : ".text";
6408 case SECCAT_RODATA_MERGE_STR
:
6409 case SECCAT_RODATA_MERGE_STR_INIT
:
6410 case SECCAT_RODATA_MERGE_CONST
:
6411 prefix
= one_only
? ".r" : ".rodata";
6413 case SECCAT_SRODATA
:
6414 prefix
= one_only
? ".s2" : ".sdata2";
6417 prefix
= one_only
? ".d" : ".data";
6419 case SECCAT_DATA_REL
:
6420 prefix
= one_only
? ".d.rel" : ".data.rel";
6422 case SECCAT_DATA_REL_LOCAL
:
6423 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6425 case SECCAT_DATA_REL_RO
:
6426 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6428 case SECCAT_DATA_REL_RO_LOCAL
:
6429 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6432 prefix
= one_only
? ".s" : ".sdata";
6435 prefix
= one_only
? ".b" : ".bss";
6438 prefix
= one_only
? ".sb" : ".sbss";
6441 prefix
= one_only
? ".td" : ".tdata";
6444 prefix
= one_only
? ".tb" : ".tbss";
6450 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
6451 name
= targetm
.strip_name_encoding (name
);
6453 /* If we're using one_only, then there needs to be a .gnu.linkonce
6454 prefix to the section name. */
6455 linkonce
= one_only
? ".gnu.linkonce" : "";
6457 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6459 DECL_SECTION_NAME (decl
) = build_string (strlen (string
), string
);
6462 /* Like compute_reloc_for_constant, except for an RTX. The return value
6463 is a mask for which bit 1 indicates a global relocation, and bit 0
6464 indicates a local relocation. */
6467 compute_reloc_for_rtx_1 (rtx
*xp
, void *data
)
6469 int *preloc
= (int *) data
;
6472 switch (GET_CODE (x
))
6475 *preloc
|= SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6488 compute_reloc_for_rtx (rtx x
)
6492 switch (GET_CODE (x
))
6498 for_each_rtx (&x
, compute_reloc_for_rtx_1
, &reloc
);
6507 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
6509 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6511 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6512 return data_section
;
6514 return readonly_data_section
;
6518 default_elf_select_rtx_section (enum machine_mode mode
, rtx x
,
6519 unsigned HOST_WIDE_INT align
)
6521 int reloc
= compute_reloc_for_rtx (x
);
6523 /* ??? Handle small data here somehow. */
6525 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6528 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6530 return get_named_section (NULL
, ".data.rel.ro", 3);
6533 return mergeable_constant_section (mode
, align
, 0);
6536 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6539 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6544 /* Careful not to prod global register variables. */
6547 symbol
= XEXP (rtl
, 0);
6548 if (GET_CODE (symbol
) != SYMBOL_REF
)
6551 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6552 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6553 flags
|= SYMBOL_FLAG_FUNCTION
;
6554 if (targetm
.binds_local_p (decl
))
6555 flags
|= SYMBOL_FLAG_LOCAL
;
6556 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6557 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6558 else if (targetm
.in_small_data_p (decl
))
6559 flags
|= SYMBOL_FLAG_SMALL
;
6560 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6561 being PUBLIC, the thing *must* be defined in this translation unit.
6562 Prevent this buglet from being propagated into rtl code as well. */
6563 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6564 flags
|= SYMBOL_FLAG_EXTERNAL
;
6566 SYMBOL_REF_FLAGS (symbol
) = flags
;
6569 /* By default, we do nothing for encode_section_info, so we need not
6570 do anything but discard the '*' marker. */
6573 default_strip_name_encoding (const char *str
)
6575 return str
+ (*str
== '*');
6578 #ifdef ASM_OUTPUT_DEF
6579 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6580 anchor relative to ".", the current section position. */
6583 default_asm_output_anchor (rtx symbol
)
6587 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6588 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6589 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6593 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6596 default_use_anchors_for_symbol_p (const_rtx symbol
)
6601 /* Don't use anchors for mergeable sections. The linker might move
6602 the objects around. */
6603 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6604 if (sect
->common
.flags
& SECTION_MERGE
)
6607 /* Don't use anchors for small data sections. The small data register
6608 acts as an anchor for such sections. */
6609 if (sect
->common
.flags
& SECTION_SMALL
)
6612 decl
= SYMBOL_REF_DECL (symbol
);
6613 if (decl
&& DECL_P (decl
))
6615 /* Don't use section anchors for decls that might be defined or
6616 usurped by other modules. */
6617 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
6620 /* Don't use section anchors for decls that will be placed in a
6621 small data section. */
6622 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6623 one above. The problem is that we only use SECTION_SMALL for
6624 sections that should be marked as small in the section directive. */
6625 if (targetm
.in_small_data_p (decl
))
6631 /* Return true when RESOLUTION indicate that symbol will be bound to the
6632 definition provided by current .o file. */
6635 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6637 return (resolution
== LDPR_PREVAILING_DEF
6638 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6639 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6642 /* Return true when RESOLUTION indicate that symbol will be bound locally
6643 within current executable or DSO. */
6646 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6648 return (resolution
== LDPR_PREVAILING_DEF
6649 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6650 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6651 || resolution
== LDPR_PREEMPTED_REG
6652 || resolution
== LDPR_PREEMPTED_IR
6653 || resolution
== LDPR_RESOLVED_IR
6654 || resolution
== LDPR_RESOLVED_EXEC
);
6657 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6658 wrt cross-module name binding. */
6661 default_binds_local_p (const_tree exp
)
6663 return default_binds_local_p_1 (exp
, flag_shlib
);
6667 default_binds_local_p_1 (const_tree exp
, int shlib
)
6670 bool resolved_locally
= false;
6671 bool resolved_to_local_def
= false;
6673 /* With resolution file in hands, take look into resolutions.
6674 We can't just return true for resolved_locally symbols,
6675 because dynamic linking might overwrite symbols
6676 in shared libraries. */
6677 if (TREE_CODE (exp
) == VAR_DECL
&& TREE_PUBLIC (exp
)
6678 && (TREE_STATIC (exp
) || DECL_EXTERNAL (exp
)))
6680 varpool_node
*vnode
= varpool_get_node (exp
);
6681 if (vnode
&& (resolution_local_p (vnode
->resolution
) || vnode
->in_other_partition
))
6682 resolved_locally
= true;
6684 && resolution_to_local_definition_p (vnode
->resolution
))
6685 resolved_to_local_def
= true;
6687 else if (TREE_CODE (exp
) == FUNCTION_DECL
&& TREE_PUBLIC (exp
))
6689 struct cgraph_node
*node
= cgraph_get_node (exp
);
6691 && (resolution_local_p (node
->resolution
) || node
->in_other_partition
))
6692 resolved_locally
= true;
6694 && resolution_to_local_definition_p (node
->resolution
))
6695 resolved_to_local_def
= true;
6698 /* A non-decl is an entry in the constant pool. */
6701 /* Weakrefs may not bind locally, even though the weakref itself is always
6702 static and therefore local. Similarly, the resolver for ifunc functions
6703 might resolve to a non-local function.
6704 FIXME: We can resolve the weakref case more curefuly by looking at the
6706 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6707 || (TREE_CODE (exp
) == FUNCTION_DECL
6708 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6710 /* Static variables are always local. */
6711 else if (! TREE_PUBLIC (exp
))
6713 /* A variable is local if the user has said explicitly that it will
6715 else if ((DECL_VISIBILITY_SPECIFIED (exp
)
6716 || resolved_to_local_def
)
6717 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6719 /* Variables defined outside this object might not be local. */
6720 else if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6722 /* If defined in this object and visibility is not default, must be
6724 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6726 /* Default visibility weak data can be overridden by a strong symbol
6727 in another module and so are not local. */
6728 else if (DECL_WEAK (exp
)
6729 && !resolved_locally
)
6731 /* If PIC, then assume that any global name can be overridden by
6732 symbols resolved from other modules. */
6735 /* Uninitialized COMMON variable may be unified with symbols
6736 resolved from other modules. */
6737 else if (DECL_COMMON (exp
)
6738 && !resolved_locally
6739 && (DECL_INITIAL (exp
) == NULL
6740 || DECL_INITIAL (exp
) == error_mark_node
))
6742 /* Otherwise we're left with initialized (or non-common) global data
6743 which is of necessity defined locally. */
6750 /* Return true when references to DECL must bind to current definition in
6753 The condition is usually equivalent to whether the function binds to the
6754 current module (shared library or executable), that is to binds_local_p.
6755 We use this fact to avoid need for another target hook and implement
6756 the logic using binds_local_p and just special cases where
6757 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6758 the weak definitions (that can be overwritten at linktime by other
6759 definition from different object file) and when resolution info is available
6760 we simply use the knowledge passed to us by linker plugin. */
6762 decl_binds_to_current_def_p (tree decl
)
6764 gcc_assert (DECL_P (decl
));
6765 if (!targetm
.binds_local_p (decl
))
6767 if (!TREE_PUBLIC (decl
))
6769 /* When resolution is available, just use it. */
6770 if (TREE_CODE (decl
) == VAR_DECL
6771 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)))
6773 varpool_node
*vnode
= varpool_get_node (decl
);
6775 && vnode
->resolution
!= LDPR_UNKNOWN
)
6776 return resolution_to_local_definition_p (vnode
->resolution
);
6778 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
6780 struct cgraph_node
*node
= cgraph_get_node (decl
);
6782 && node
->resolution
!= LDPR_UNKNOWN
)
6783 return resolution_to_local_definition_p (node
->resolution
);
6785 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6786 binds locally but still can be overwritten), DECL_COMMON (can be merged
6787 with a non-common definition somewhere in the same module) or
6789 This rely on fact that binds_local_p behave as decl_replaceable_p
6790 for all other declaration types. */
6791 if (DECL_WEAK (decl
))
6793 if (DECL_COMMON (decl
)
6794 && (DECL_INITIAL (decl
) == NULL
6795 || DECL_INITIAL (decl
) == error_mark_node
))
6797 if (DECL_EXTERNAL (decl
))
6802 /* A replaceable function or variable is one which may be replaced
6803 at link-time with an entirely different definition, provided that the
6804 replacement has the same type. For example, functions declared
6805 with __attribute__((weak)) on most systems are replaceable.
6807 COMDAT functions are not replaceable, since all definitions of the
6808 function must be equivalent. It is important that COMDAT functions
6809 not be treated as replaceable so that use of C++ template
6810 instantiations is not penalized. */
6813 decl_replaceable_p (tree decl
)
6815 gcc_assert (DECL_P (decl
));
6816 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
6818 return !decl_binds_to_current_def_p (decl
);
6821 /* Default function to output code that will globalize a label. A
6822 target must define GLOBAL_ASM_OP or provide its own function to
6823 globalize a label. */
6824 #ifdef GLOBAL_ASM_OP
6826 default_globalize_label (FILE * stream
, const char *name
)
6828 fputs (GLOBAL_ASM_OP
, stream
);
6829 assemble_name (stream
, name
);
6830 putc ('\n', stream
);
6832 #endif /* GLOBAL_ASM_OP */
6834 /* Default function to output code that will globalize a declaration. */
6836 default_globalize_decl_name (FILE * stream
, tree decl
)
6838 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6839 targetm
.asm_out
.globalize_label (stream
, name
);
6842 /* Default function to output a label for unwind information. The
6843 default is to do nothing. A target that needs nonlocal labels for
6844 unwind information must provide its own function to do this. */
6846 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6847 tree decl ATTRIBUTE_UNUSED
,
6848 int for_eh ATTRIBUTE_UNUSED
,
6849 int empty ATTRIBUTE_UNUSED
)
6853 /* Default function to output a label to divide up the exception table.
6854 The default is to do nothing. A target that needs/wants to divide
6855 up the table must provide it's own function to do this. */
6857 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
6861 /* This is how to output an internal numbered label where PREFIX is
6862 the class of label and LABELNO is the number within the class. */
6865 default_generate_internal_label (char *buf
, const char *prefix
,
6866 unsigned long labelno
)
6868 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6871 /* This is how to output an internal numbered label where PREFIX is
6872 the class of label and LABELNO is the number within the class. */
6875 default_internal_label (FILE *stream
, const char *prefix
,
6876 unsigned long labelno
)
6878 char *const buf
= (char *) alloca (40 + strlen (prefix
));
6879 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6880 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
6884 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
6887 default_asm_declare_constant_name (FILE *file
, const char *name
,
6888 const_tree exp ATTRIBUTE_UNUSED
,
6889 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
6891 assemble_label (file
, name
);
6894 /* This is the default behavior at the beginning of a file. It's
6895 controlled by two other target-hook toggles. */
6897 default_file_start (void)
6899 if (targetm
.asm_file_start_app_off
6900 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
6901 fputs (ASM_APP_OFF
, asm_out_file
);
6903 if (targetm
.asm_file_start_file_directive
)
6904 output_file_directive (asm_out_file
, main_input_filename
);
6907 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6908 which emits a special section directive used to indicate whether or
6909 not this object file needs an executable stack. This is primarily
6910 a GNU extension to ELF but could be used on other targets. */
6912 int trampolines_created
;
6915 file_end_indicate_exec_stack (void)
6917 unsigned int flags
= SECTION_DEBUG
;
6918 if (trampolines_created
)
6919 flags
|= SECTION_CODE
;
6921 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
6924 /* Emit a special section directive to indicate that this object file
6925 was compiled with -fsplit-stack. This is used to let the linker
6926 detect calls between split-stack code and non-split-stack code, so
6927 that it can modify the split-stack code to allocate a sufficiently
6928 large stack. We emit another special section if there are any
6929 functions in this file which have the no_split_stack attribute, to
6930 prevent the linker from warning about being unable to convert the
6931 functions if they call non-split-stack code. */
6934 file_end_indicate_split_stack (void)
6936 if (flag_split_stack
)
6938 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
6940 if (saw_no_split_stack
)
6941 switch_to_section (get_section (".note.GNU-no-split-stack",
6942 SECTION_DEBUG
, NULL
));
6946 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6947 a get_unnamed_section callback. */
6950 output_section_asm_op (const void *directive
)
6952 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
6955 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6956 the current section is NEW_SECTION. */
6959 switch_to_section (section
*new_section
)
6961 if (in_section
== new_section
)
6964 if (new_section
->common
.flags
& SECTION_FORGET
)
6967 in_section
= new_section
;
6969 switch (SECTION_STYLE (new_section
))
6972 targetm
.asm_out
.named_section (new_section
->named
.name
,
6973 new_section
->named
.common
.flags
,
6974 new_section
->named
.decl
);
6977 case SECTION_UNNAMED
:
6978 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
6981 case SECTION_NOSWITCH
:
6986 new_section
->common
.flags
|= SECTION_DECLARED
;
6989 /* If block symbol SYMBOL has not yet been assigned an offset, place
6990 it at the end of its block. */
6993 place_block_symbol (rtx symbol
)
6995 unsigned HOST_WIDE_INT size
, mask
, offset
;
6996 struct constant_descriptor_rtx
*desc
;
6997 unsigned int alignment
;
6998 struct object_block
*block
;
7001 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7002 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7005 /* Work out the symbol's size and alignment. */
7006 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7008 desc
= SYMBOL_REF_CONSTANT (symbol
);
7009 alignment
= desc
->align
;
7010 size
= GET_MODE_SIZE (desc
->mode
);
7012 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7014 decl
= SYMBOL_REF_DECL (symbol
);
7015 alignment
= DECL_ALIGN (decl
);
7016 size
= get_constant_size (DECL_INITIAL (decl
));
7017 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7018 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7019 && asan_protect_global (DECL_INITIAL (decl
)))
7020 size
+= asan_red_zone_size (size
);
7024 struct symtab_node
*snode
;
7025 decl
= SYMBOL_REF_DECL (symbol
);
7027 snode
= symtab_get_node (decl
);
7030 rtx target
= DECL_RTL (symtab_alias_ultimate_target (snode
)->decl
);
7031 SYMBOL_REF_BLOCK_OFFSET (symbol
) = SYMBOL_REF_BLOCK_OFFSET (target
);
7034 alignment
= get_variable_align (decl
);
7035 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7036 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7037 && asan_protect_global (decl
))
7039 size
+= asan_red_zone_size (size
);
7040 alignment
= MAX (alignment
,
7041 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7045 /* Calculate the object's offset from the start of the block. */
7046 block
= SYMBOL_REF_BLOCK (symbol
);
7047 mask
= alignment
/ BITS_PER_UNIT
- 1;
7048 offset
= (block
->size
+ mask
) & ~mask
;
7049 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7051 /* Record the block's new alignment and size. */
7052 block
->alignment
= MAX (block
->alignment
, alignment
);
7053 block
->size
= offset
+ size
;
7055 vec_safe_push (block
->objects
, symbol
);
7058 /* Return the anchor that should be used to address byte offset OFFSET
7059 from the first object in BLOCK. MODEL is the TLS model used
7063 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7064 enum tls_model model
)
7067 unsigned int begin
, middle
, end
;
7068 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7071 /* Work out the anchor's offset. Use an offset of 0 for the first
7072 anchor so that we don't pessimize the case where we take the address
7073 of a variable at the beginning of the block. This is particularly
7074 useful when a block has only one variable assigned to it.
7076 We try to place anchors RANGE bytes apart, so there can then be
7077 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7078 a ptr_mode offset. With some target settings, the lowest such
7079 anchor might be out of range for the lowest ptr_mode offset;
7080 likewise the highest anchor for the highest offset. Use anchors
7081 at the extreme ends of the ptr_mode range in such cases.
7083 All arithmetic uses unsigned integers in order to avoid
7085 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7086 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7087 range
= max_offset
- min_offset
+ 1;
7092 bias
= 1 << (GET_MODE_BITSIZE (ptr_mode
) - 1);
7095 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7096 delta
-= delta
% range
;
7099 offset
= (HOST_WIDE_INT
) (-delta
);
7103 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7104 delta
-= delta
% range
;
7105 if (delta
> bias
- 1)
7107 offset
= (HOST_WIDE_INT
) delta
;
7111 /* Do a binary search to see if there's already an anchor we can use.
7112 Set BEGIN to the new anchor's index if not. */
7114 end
= vec_safe_length (block
->anchors
);
7115 while (begin
!= end
)
7117 middle
= (end
+ begin
) / 2;
7118 anchor
= (*block
->anchors
)[middle
];
7119 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7121 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7123 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7125 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7131 /* Create a new anchor with a unique label. */
7132 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7133 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7134 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7135 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7137 /* Insert it at index BEGIN. */
7138 vec_safe_insert (block
->anchors
, begin
, anchor
);
7142 /* Output the objects in BLOCK. */
7145 output_object_block (struct object_block
*block
)
7147 struct constant_descriptor_rtx
*desc
;
7149 HOST_WIDE_INT offset
;
7153 if (!block
->objects
)
7156 /* Switch to the section and make sure that the first byte is
7157 suitably aligned. */
7158 switch_to_section (block
->sect
);
7159 assemble_align (block
->alignment
);
7161 /* Define the values of all anchors relative to the current section
7163 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7164 targetm
.asm_out
.output_anchor (symbol
);
7166 /* Output the objects themselves. */
7168 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7170 /* Move to the object's offset, padding with zeros if necessary. */
7171 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7172 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7173 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7175 desc
= SYMBOL_REF_CONSTANT (symbol
);
7176 output_constant_pool_1 (desc
, 1);
7177 offset
+= GET_MODE_SIZE (desc
->mode
);
7179 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7182 decl
= SYMBOL_REF_DECL (symbol
);
7183 assemble_constant_contents (DECL_INITIAL (decl
), XSTR (symbol
, 0),
7185 size
= get_constant_size (DECL_INITIAL (decl
));
7187 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7188 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7189 && asan_protect_global (DECL_INITIAL (decl
)))
7191 size
= asan_red_zone_size (size
);
7192 assemble_zeros (size
);
7199 decl
= SYMBOL_REF_DECL (symbol
);
7200 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7201 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7203 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7204 && asan_protect_global (decl
))
7206 size
= asan_red_zone_size (size
);
7207 assemble_zeros (size
);
7214 /* A htab_traverse callback used to call output_object_block for
7215 each member of object_block_htab. */
7218 output_object_block_htab (void **slot
, void *data ATTRIBUTE_UNUSED
)
7220 output_object_block ((struct object_block
*) (*slot
));
7224 /* Output the definitions of all object_blocks. */
7227 output_object_blocks (void)
7229 htab_traverse (object_block_htab
, output_object_block_htab
, NULL
);
7232 /* This function provides a possible implementation of the
7233 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7234 by -frecord-gcc-switches it creates a new mergeable, string section in the
7235 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7236 contains the switches in ASCII format.
7238 FIXME: This code does not correctly handle double quote characters
7239 that appear inside strings, (it strips them rather than preserving them).
7240 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7241 characters - instead it treats them as sub-string separators. Since
7242 we want to emit NUL strings terminators into the object file we have to use
7246 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7250 case SWITCH_TYPE_PASSED
:
7251 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7252 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7255 case SWITCH_TYPE_DESCRIPTIVE
:
7258 /* Distinguish between invocations where name is NULL. */
7259 static bool started
= false;
7265 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7269 | (SECTION_ENTSIZE
& 1),
7271 switch_to_section (sec
);
7280 /* The return value is currently ignored by the caller, but must be 0.
7281 For -fverbose-asm the return value would be the number of characters
7282 emitted into the assembler file. */
7286 /* Emit text to declare externally defined symbols. It is needed to
7287 properly support non-default visibility. */
7289 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7291 const char *name ATTRIBUTE_UNUSED
)
7293 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7294 set in order to avoid putting out names that are never really
7296 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7297 && targetm
.binds_local_p (decl
))
7298 maybe_assemble_visibility (decl
);
7301 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7304 default_asm_output_source_filename (FILE *file
, const char *name
)
7306 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7307 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7309 fprintf (file
, "\t.file\t");
7310 output_quoted_string (file
, name
);
7315 /* Output a file name in the form wanted by System V. */
7318 output_file_directive (FILE *asm_file
, const char *input_name
)
7323 if (input_name
== NULL
)
7324 input_name
= "<stdin>";
7326 input_name
= remap_debug_filename (input_name
);
7328 len
= strlen (input_name
);
7329 na
= input_name
+ len
;
7331 /* NA gets INPUT_NAME sans directory names. */
7332 while (na
> input_name
)
7334 if (IS_DIR_SEPARATOR (na
[-1]))
7339 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7342 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7345 make_debug_expr_from_rtl (const_rtx exp
)
7347 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7348 enum machine_mode mode
= GET_MODE (exp
);
7351 DECL_ARTIFICIAL (ddecl
) = 1;
7352 if (REG_P (exp
) && REG_EXPR (exp
))
7353 type
= TREE_TYPE (REG_EXPR (exp
));
7354 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7355 type
= TREE_TYPE (MEM_EXPR (exp
));
7358 if (type
&& TYPE_MODE (type
) == mode
)
7359 TREE_TYPE (ddecl
) = type
;
7361 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7362 DECL_MODE (ddecl
) = mode
;
7363 dval
= gen_rtx_DEBUG_EXPR (mode
);
7364 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7365 SET_DECL_RTL (ddecl
, dval
);
7369 #ifdef ELF_ASCII_ESCAPES
7370 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7373 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7378 fputs (STRING_ASM_OP
, f
);
7383 escape
= ELF_ASCII_ESCAPES
[c
];
7390 /* TODO: Print in hex with fast function, important for -flto. */
7391 fprintf (f
, "\\%03o", c
);
7404 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7407 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7409 const char *limit
= s
+ len
;
7410 const char *last_null
= NULL
;
7411 unsigned bytes_in_chunk
= 0;
7415 for (; s
< limit
; s
++)
7419 if (bytes_in_chunk
>= 60)
7428 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7435 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7437 if (bytes_in_chunk
> 0)
7444 default_elf_asm_output_limited_string (f
, s
);
7449 if (bytes_in_chunk
== 0)
7450 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7453 escape
= ELF_ASCII_ESCAPES
[c
];
7461 /* TODO: Print in hex with fast function, important for -flto. */
7462 fprintf (f
, "\\%03o", c
);
7463 bytes_in_chunk
+= 4;
7468 bytes_in_chunk
+= 2;
7475 if (bytes_in_chunk
> 0)
7483 static GTY(()) section
*elf_init_array_section
;
7484 static GTY(()) section
*elf_fini_array_section
;
7487 get_elf_initfini_array_priority_section (int priority
,
7491 if (priority
!= DEFAULT_INIT_PRIORITY
)
7494 sprintf (buf
, "%s.%.5u",
7495 constructor_p
? ".init_array" : ".fini_array",
7497 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7503 if (elf_init_array_section
== NULL
)
7504 elf_init_array_section
7505 = get_section (".init_array",
7506 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7507 sec
= elf_init_array_section
;
7511 if (elf_fini_array_section
== NULL
)
7512 elf_fini_array_section
7513 = get_section (".fini_array",
7514 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7515 sec
= elf_fini_array_section
;
7521 /* Use .init_array section for constructors. */
7524 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7526 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7528 assemble_addr_to_section (symbol
, sec
);
7531 /* Use .fini_array section for destructors. */
7534 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7536 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7538 assemble_addr_to_section (symbol
, sec
);
7541 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7543 This is a bit of a cheat. The real default is a no-op, but this
7544 hook is the default for all targets with a .ident directive. */
7547 default_asm_output_ident_directive (const char *ident_str
)
7549 const char *ident_asm_op
= "\t.ident\t";
7551 /* If we are still in the front end, do not write out the string
7552 to asm_out_file. Instead, add a fake top-level asm statement.
7553 This allows the front ends to use this hook without actually
7554 writing to asm_out_file, to handle #ident or Pragma Ident. */
7555 if (cgraph_state
== CGRAPH_STATE_PARSING
)
7557 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7558 add_asm_node (build_string (strlen (buf
), buf
));
7561 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7564 #include "gt-varasm.h"