1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987-2013 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"
37 #include "hard-reg-set.h"
40 #include "diagnostic-core.h"
43 #include "langhooks.h"
47 #include "common/common-target.h"
48 #include "targhooks.h"
50 #include "pointer-set.h"
52 #include "basic-block.h"
54 #ifdef XCOFF_DEBUGGING_INFO
55 #include "xcoffout.h" /* Needed for external data
56 declarations for e.g. AIX 4.x. */
59 /* The (assembler) name of the first globally-visible object output. */
60 extern GTY(()) const char *first_global_object_name
;
61 extern GTY(()) const char *weak_global_object_name
;
63 const char *first_global_object_name
;
64 const char *weak_global_object_name
;
67 struct constant_descriptor_rtx
;
68 struct rtx_constant_pool
;
70 #define n_deferred_constants (crtl->varasm.deferred_constants)
72 /* Number for making the label on the next
73 constant that is stored in memory. */
75 static GTY(()) int const_labelno
;
77 /* Carry information from ASM_DECLARE_OBJECT_NAME
78 to ASM_FINISH_DECLARE_OBJECT. */
80 int size_directive_output
;
82 /* The last decl for which assemble_variable was called,
83 if it did ASM_DECLARE_OBJECT_NAME.
84 If the last call to assemble_variable didn't do that,
87 tree last_assemble_variable_decl
;
89 /* The following global variable indicates if the first basic block
90 in a function belongs to the cold partition or not. */
92 bool first_function_block_is_cold
;
94 /* We give all constants their own alias set. Perhaps redundant with
95 MEM_READONLY_P, but pre-dates it. */
97 static alias_set_type const_alias_set
;
99 /* Whether we saw any functions with no_split_stack. */
101 static bool saw_no_split_stack
;
103 static const char *strip_reg_name (const char *);
104 static int contains_pointers_p (tree
);
105 #ifdef ASM_OUTPUT_EXTERNAL
106 static bool incorporeal_function_p (tree
);
108 static void decode_addr_const (tree
, struct addr_const
*);
109 static hashval_t
const_desc_hash (const void *);
110 static int const_desc_eq (const void *, const void *);
111 static hashval_t
const_hash_1 (const tree
);
112 static int compare_constant (const tree
, const tree
);
113 static tree
copy_constant (tree
);
114 static void output_constant_def_contents (rtx
);
115 static void output_addressed_constants (tree
);
116 static unsigned HOST_WIDE_INT
array_size_for_constructor (tree
);
117 static unsigned min_align (unsigned, unsigned);
118 static void globalize_decl (tree
);
119 static bool decl_readonly_section_1 (enum section_category
);
120 #ifdef BSS_SECTION_ASM_OP
121 #ifdef ASM_OUTPUT_ALIGNED_BSS
122 static void asm_output_aligned_bss (FILE *, tree
, const char *,
123 unsigned HOST_WIDE_INT
, int)
126 #endif /* BSS_SECTION_ASM_OP */
127 static void mark_weak (tree
);
128 static void output_constant_pool (const char *, tree
);
130 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
131 section
*text_section
;
132 section
*data_section
;
133 section
*readonly_data_section
;
134 section
*sdata_section
;
135 section
*ctors_section
;
136 section
*dtors_section
;
137 section
*bss_section
;
138 section
*sbss_section
;
140 /* Various forms of common section. All are guaranteed to be nonnull. */
141 section
*tls_comm_section
;
142 section
*comm_section
;
143 section
*lcomm_section
;
145 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
147 section
*bss_noswitch_section
;
149 /* The section that holds the main exception table, when known. The section
150 is set either by the target's init_sections hook or by the first call to
151 switch_to_exception_section. */
152 section
*exception_section
;
154 /* The section that holds the DWARF2 frame unwind information, when known.
155 The section is set either by the target's init_sections hook or by the
156 first call to switch_to_eh_frame_section. */
157 section
*eh_frame_section
;
159 /* asm_out_file's current section. This is NULL if no section has yet
160 been selected or if we lose track of what the current section is. */
163 /* True if code for the current function is currently being directed
164 at the cold section. */
165 bool in_cold_section_p
;
167 /* A linked list of all the unnamed sections. */
168 static GTY(()) section
*unnamed_sections
;
170 /* Return a nonzero value if DECL has a section attribute. */
171 #define IN_NAMED_SECTION(DECL) \
172 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
173 && DECL_SECTION_NAME (DECL) != NULL_TREE)
175 /* Hash table of named sections. */
176 static GTY((param_is (section
))) htab_t section_htab
;
178 /* A table of object_blocks, indexed by section. */
179 static GTY((param_is (struct object_block
))) htab_t object_block_htab
;
181 /* The next number to use for internal anchor labels. */
182 static GTY(()) int anchor_labelno
;
184 /* A pool of constants that can be shared between functions. */
185 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
187 /* Helper routines for maintaining section_htab. */
190 section_entry_eq (const void *p1
, const void *p2
)
192 const section
*old
= (const section
*) p1
;
193 const char *new_name
= (const char *) p2
;
195 return strcmp (old
->named
.name
, new_name
) == 0;
199 section_entry_hash (const void *p
)
201 const section
*old
= (const section
*) p
;
202 return htab_hash_string (old
->named
.name
);
205 /* Return a hash value for section SECT. */
208 hash_section (section
*sect
)
210 if (sect
->common
.flags
& SECTION_NAMED
)
211 return htab_hash_string (sect
->named
.name
);
212 return sect
->common
.flags
;
215 /* Helper routines for maintaining object_block_htab. */
218 object_block_entry_eq (const void *p1
, const void *p2
)
220 const struct object_block
*old
= (const struct object_block
*) p1
;
221 const section
*new_section
= (const section
*) p2
;
223 return old
->sect
== new_section
;
227 object_block_entry_hash (const void *p
)
229 const struct object_block
*old
= (const struct object_block
*) p
;
230 return hash_section (old
->sect
);
233 /* Return a new unnamed section with the given fields. */
236 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
241 sect
= ggc_alloc_section ();
242 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
243 sect
->unnamed
.callback
= callback
;
244 sect
->unnamed
.data
= data
;
245 sect
->unnamed
.next
= unnamed_sections
;
247 unnamed_sections
= sect
;
251 /* Return a SECTION_NOSWITCH section with the given fields. */
254 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
258 sect
= ggc_alloc_section ();
259 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
260 sect
->noswitch
.callback
= callback
;
265 /* Return the named section structure associated with NAME. Create
266 a new section with the given fields if no such structure exists. */
269 get_section (const char *name
, unsigned int flags
, tree decl
)
271 section
*sect
, **slot
;
274 htab_find_slot_with_hash (section_htab
, name
,
275 htab_hash_string (name
), INSERT
);
276 flags
|= SECTION_NAMED
;
279 sect
= ggc_alloc_section ();
280 sect
->named
.common
.flags
= flags
;
281 sect
->named
.name
= ggc_strdup (name
);
282 sect
->named
.decl
= decl
;
288 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
289 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
291 /* It is fine if one of the section flags is
292 SECTION_WRITE | SECTION_RELRO and the other has none of these
293 flags (i.e. read-only) in named sections and either the
294 section hasn't been declared yet or has been declared as writable.
295 In that case just make sure the resulting flags are
296 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
298 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
299 == (SECTION_WRITE
| SECTION_RELRO
)
300 && (sect
->common
.flags
301 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
302 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
303 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
304 || (sect
->common
.flags
& SECTION_WRITE
)))
306 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
309 /* Sanity check user variables for flag changes. */
310 if (sect
->named
.decl
!= NULL
311 && DECL_P (sect
->named
.decl
)
312 && decl
!= sect
->named
.decl
)
314 if (decl
!= NULL
&& DECL_P (decl
))
315 error ("%+D causes a section type conflict with %D",
316 decl
, sect
->named
.decl
);
318 error ("section type conflict with %D", sect
->named
.decl
);
319 inform (DECL_SOURCE_LOCATION (sect
->named
.decl
),
320 "%qD was declared here", sect
->named
.decl
);
322 else if (decl
!= NULL
&& DECL_P (decl
))
323 error ("%+D causes a section type conflict", decl
);
325 error ("section type conflict");
326 /* Make sure we don't error about one section multiple times. */
327 sect
->common
.flags
|= SECTION_OVERRIDE
;
333 /* Return true if the current compilation mode benefits from having
334 objects grouped into blocks. */
337 use_object_blocks_p (void)
339 return flag_section_anchors
;
342 /* Return the object_block structure for section SECT. Create a new
343 structure if we haven't created one already. Return null if SECT
346 static struct object_block
*
347 get_block_for_section (section
*sect
)
349 struct object_block
*block
;
355 slot
= htab_find_slot_with_hash (object_block_htab
, sect
,
356 hash_section (sect
), INSERT
);
357 block
= (struct object_block
*) *slot
;
360 block
= ggc_alloc_cleared_object_block ();
367 /* Create a symbol with label LABEL and place it at byte offset
368 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
369 is not yet known. LABEL must be a garbage-collected string. */
372 create_block_symbol (const char *label
, struct object_block
*block
,
373 HOST_WIDE_INT offset
)
378 /* Create the extended SYMBOL_REF. */
379 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
380 symbol
= ggc_alloc_rtx_def (size
);
382 /* Initialize the normal SYMBOL_REF fields. */
383 memset (symbol
, 0, size
);
384 PUT_CODE (symbol
, SYMBOL_REF
);
385 PUT_MODE (symbol
, Pmode
);
386 XSTR (symbol
, 0) = label
;
387 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
389 /* Initialize the block_symbol stuff. */
390 SYMBOL_REF_BLOCK (symbol
) = block
;
391 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
396 /* Return a section with a particular name and with whatever SECTION_*
397 flags section_type_flags deems appropriate. The name of the section
398 is taken from NAME if nonnull, otherwise it is taken from DECL's
399 DECL_SECTION_NAME. DECL is the decl associated with the section
400 (see the section comment for details) and RELOC is as for
401 section_type_flags. */
404 get_named_section (tree decl
, const char *name
, int reloc
)
410 gcc_assert (decl
&& DECL_P (decl
) && DECL_SECTION_NAME (decl
));
411 name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
414 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
415 return get_section (name
, flags
, decl
);
418 /* If required, set DECL_SECTION_NAME to a unique name. */
421 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
422 int flag_function_or_data_sections
)
424 if (DECL_SECTION_NAME (decl
) == NULL_TREE
425 && targetm_common
.have_named_sections
426 && (flag_function_or_data_sections
427 || DECL_ONE_ONLY (decl
)))
429 targetm
.asm_out
.unique_section (decl
, reloc
);
430 DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
) = true;
434 #ifdef BSS_SECTION_ASM_OP
436 #ifdef ASM_OUTPUT_ALIGNED_BSS
438 /* Utility function for targets to use in implementing
439 ASM_OUTPUT_ALIGNED_BSS.
440 ??? It is believed that this function will work in most cases so such
441 support is localized here. */
444 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
445 const char *name
, unsigned HOST_WIDE_INT size
,
448 switch_to_section (bss_section
);
449 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
450 #ifdef ASM_DECLARE_OBJECT_NAME
451 last_assemble_variable_decl
= decl
;
452 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
454 /* Standard thing is just output label for the object. */
455 ASM_OUTPUT_LABEL (file
, name
);
456 #endif /* ASM_DECLARE_OBJECT_NAME */
457 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
462 #endif /* BSS_SECTION_ASM_OP */
464 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
465 /* Return the hot section for function DECL. Return text_section for
469 hot_function_section (tree decl
)
471 if (decl
!= NULL_TREE
472 && DECL_SECTION_NAME (decl
) != NULL_TREE
473 && targetm_common
.have_named_sections
)
474 return get_named_section (decl
, NULL
, 0);
480 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
483 When DECL_SECTION_NAME is non-NULL and it is implicit section and
484 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
485 concatenate the name with NAMED_SECTION_SUFFIX.
486 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
489 get_named_text_section (tree decl
,
490 const char *text_section_name
,
491 const char *named_section_suffix
)
493 if (decl
&& DECL_SECTION_NAME (decl
))
495 if (named_section_suffix
)
497 tree dsn
= DECL_SECTION_NAME (decl
);
498 const char *stripped_name
;
501 name
= (char *) alloca (TREE_STRING_LENGTH (dsn
) + 1);
502 memcpy (name
, TREE_STRING_POINTER (dsn
),
503 TREE_STRING_LENGTH (dsn
) + 1);
505 stripped_name
= targetm
.strip_name_encoding (name
);
507 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
508 return get_named_section (decl
, buffer
, 0);
510 else if (DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
))
514 /* Do not try to split gnu_linkonce functions. This gets somewhat
516 if (DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
)
518 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
519 name
= targetm
.strip_name_encoding (name
);
520 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
526 return get_named_section (decl
, text_section_name
, 0);
529 /* Choose named function section based on its frequency. */
532 default_function_section (tree decl
, enum node_frequency freq
,
533 bool startup
, bool exit
)
535 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
536 /* Old GNU linkers have buggy --gc-section support, which sometimes
537 results in .gcc_except_table* sections being garbage collected. */
539 && DECL_SECTION_NAME (decl
)
540 && DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
))
544 if (!flag_reorder_functions
545 || !targetm_common
.have_named_sections
)
547 /* Startup code should go to startup subsection unless it is
548 unlikely executed (this happens especially with function splitting
549 where we can split away unnecessary parts of static constructors. */
550 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
551 return get_named_text_section (decl
, ".text.startup", NULL
);
553 /* Similarly for exit. */
554 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
555 return get_named_text_section (decl
, ".text.exit", NULL
);
557 /* Group cold functions together, similarly for hot code. */
560 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
561 return get_named_text_section (decl
, ".text.unlikely", NULL
);
562 case NODE_FREQUENCY_HOT
:
563 return get_named_text_section (decl
, ".text.hot", NULL
);
569 /* Return the section for function DECL.
571 If DECL is NULL_TREE, return the text section. We can be passed
572 NULL_TREE under some circumstances by dbxout.c at least.
574 If FORCE_COLD is true, return cold function section ignoring
575 the frequency info of cgraph_node. */
578 function_section_1 (tree decl
, bool force_cold
)
580 section
*section
= NULL
;
581 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
582 bool startup
= false, exit
= false;
586 struct cgraph_node
*node
= cgraph_get_node (decl
);
590 freq
= node
->frequency
;
591 startup
= node
->only_called_at_startup
;
592 exit
= node
->only_called_at_exit
;
596 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
598 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
599 if (decl
!= NULL_TREE
600 && DECL_SECTION_NAME (decl
) != NULL_TREE
)
602 if (targetm
.asm_out
.function_section
)
603 section
= targetm
.asm_out
.function_section (decl
, freq
,
607 return get_named_section (decl
, NULL
, 0);
610 return targetm
.asm_out
.select_section
611 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
614 if (targetm
.asm_out
.function_section
)
615 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
618 return hot_function_section (decl
);
622 /* Return the section for function DECL.
624 If DECL is NULL_TREE, return the text section. We can be passed
625 NULL_TREE under some circumstances by dbxout.c at least. */
628 function_section (tree decl
)
630 /* Handle cases where function splitting code decides
631 to put function entry point into unlikely executed section
632 despite the fact that the function itself is not cold
633 (i.e. it is called rarely but contains a hot loop that is
634 better to live in hot subsection for the code locality). */
635 return function_section_1 (decl
,
636 first_function_block_is_cold
);
639 /* Return the section for the current function, take IN_COLD_SECTION_P
643 current_function_section (void)
645 return function_section_1 (current_function_decl
, in_cold_section_p
);
648 /* Tell assembler to switch to unlikely-to-be-executed text section. */
651 unlikely_text_section (void)
653 return function_section_1 (current_function_decl
, true);
656 /* When called within a function context, return true if the function
657 has been assigned a cold text section and if SECT is that section.
658 When called outside a function context, return true if SECT is the
659 default cold section. */
662 unlikely_text_section_p (section
*sect
)
664 return sect
== function_section_1 (current_function_decl
, true);
667 /* Return the read-only data section associated with function DECL. */
670 default_function_rodata_section (tree decl
)
672 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
674 const char *name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
676 if (DECL_ONE_ONLY (decl
) && HAVE_COMDAT_GROUP
)
682 dot
= strchr (name
+ 1, '.');
685 len
= strlen (dot
) + 8;
686 rname
= (char *) alloca (len
);
688 strcpy (rname
, ".rodata");
690 return get_section (rname
, SECTION_LINKONCE
, decl
);
692 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
693 else if (DECL_ONE_ONLY (decl
)
694 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
696 size_t len
= strlen (name
) + 1;
697 char *rname
= (char *) alloca (len
);
699 memcpy (rname
, name
, len
);
701 return get_section (rname
, SECTION_LINKONCE
, decl
);
703 /* For .text.foo we want to use .rodata.foo. */
704 else if (flag_function_sections
&& flag_data_sections
705 && strncmp (name
, ".text.", 6) == 0)
707 size_t len
= strlen (name
) + 1;
708 char *rname
= (char *) alloca (len
+ 2);
710 memcpy (rname
, ".rodata", 7);
711 memcpy (rname
+ 7, name
+ 5, len
- 5);
712 return get_section (rname
, 0, decl
);
716 return readonly_data_section
;
719 /* Return the read-only data section associated with function DECL
720 for targets where that section should be always the single
721 readonly data section. */
724 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
726 return readonly_data_section
;
729 /* Return the section to use for string merging. */
732 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
733 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
734 unsigned int flags ATTRIBUTE_UNUSED
)
738 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
739 && TREE_CODE (decl
) == STRING_CST
740 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
742 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
743 && TREE_STRING_LENGTH (decl
) >= len
)
745 enum machine_mode mode
;
746 unsigned int modesize
;
750 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
751 char *name
= (char *) alloca (strlen (prefix
) + 30);
753 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
754 modesize
= GET_MODE_BITSIZE (mode
);
755 if (modesize
>= 8 && modesize
<= 256
756 && (modesize
& (modesize
- 1)) == 0)
758 if (align
< modesize
)
761 str
= TREE_STRING_POINTER (decl
);
762 unit
= GET_MODE_SIZE (mode
);
764 /* Check for embedded NUL characters. */
765 for (i
= 0; i
< len
; i
+= unit
)
767 for (j
= 0; j
< unit
; j
++)
768 if (str
[i
+ j
] != '\0')
775 sprintf (name
, "%s.str%d.%d", prefix
,
776 modesize
/ 8, (int) (align
/ 8));
777 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
778 return get_section (name
, flags
, NULL
);
783 return readonly_data_section
;
786 /* Return the section to use for constant merging. */
789 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
790 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
791 unsigned int flags ATTRIBUTE_UNUSED
)
793 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
795 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
801 && (align
& (align
- 1)) == 0)
803 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
804 char *name
= (char *) alloca (strlen (prefix
) + 30);
806 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
807 flags
|= (align
/ 8) | SECTION_MERGE
;
808 return get_section (name
, flags
, NULL
);
810 return readonly_data_section
;
813 /* Given NAME, a putative register name, discard any customary prefixes. */
816 strip_reg_name (const char *name
)
818 #ifdef REGISTER_PREFIX
819 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
820 name
+= strlen (REGISTER_PREFIX
);
822 if (name
[0] == '%' || name
[0] == '#')
827 /* The user has asked for a DECL to have a particular name. Set (or
828 change) it in such a way that we don't prefix an underscore to
831 set_user_assembler_name (tree decl
, const char *name
)
833 char *starred
= (char *) alloca (strlen (name
) + 2);
835 strcpy (starred
+ 1, name
);
836 change_decl_assembler_name (decl
, get_identifier (starred
));
837 SET_DECL_RTL (decl
, NULL_RTX
);
840 /* Decode an `asm' spec for a declaration as a register name.
841 Return the register number, or -1 if nothing specified,
842 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
843 or -3 if ASMSPEC is `cc' and is not recognized,
844 or -4 if ASMSPEC is `memory' and is not recognized.
845 Accept an exact spelling or a decimal number.
846 Prefixes such as % are optional. */
849 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
851 /* Presume just one register is clobbered. */
858 /* Get rid of confusing prefixes. */
859 asmspec
= strip_reg_name (asmspec
);
861 /* Allow a decimal number as a "register name". */
862 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
863 if (! ISDIGIT (asmspec
[i
]))
865 if (asmspec
[0] != 0 && i
< 0)
868 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0)
874 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
876 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
879 #ifdef OVERLAPPING_REGISTER_NAMES
883 const char *const name
;
886 } table
[] = OVERLAPPING_REGISTER_NAMES
;
888 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
890 && ! strcmp (asmspec
, table
[i
].name
))
892 *pnregs
= table
[i
].nregs
;
893 return table
[i
].number
;
896 #endif /* OVERLAPPING_REGISTER_NAMES */
898 #ifdef ADDITIONAL_REGISTER_NAMES
900 static const struct { const char *const name
; const int number
; } table
[]
901 = ADDITIONAL_REGISTER_NAMES
;
903 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
905 && ! strcmp (asmspec
, table
[i
].name
))
906 return table
[i
].number
;
908 #endif /* ADDITIONAL_REGISTER_NAMES */
910 if (!strcmp (asmspec
, "memory"))
913 if (!strcmp (asmspec
, "cc"))
923 decode_reg_name (const char *name
)
926 return decode_reg_name_and_count (name
, &count
);
930 /* Return true if DECL's initializer is suitable for a BSS section. */
933 bss_initializer_p (const_tree decl
)
935 return (DECL_INITIAL (decl
) == NULL
936 || DECL_INITIAL (decl
) == error_mark_node
937 || (flag_zero_initialized_in_bss
938 /* Leave constant zeroes in .rodata so they
940 && !TREE_READONLY (decl
)
941 && initializer_zerop (DECL_INITIAL (decl
))));
944 /* Compute the alignment of variable specified by DECL.
945 DONT_OUTPUT_DATA is from assemble_variable. */
948 align_variable (tree decl
, bool dont_output_data
)
950 unsigned int align
= DECL_ALIGN (decl
);
952 /* In the case for initialing an array whose length isn't specified,
953 where we have not yet been able to do the layout,
954 figure out the proper alignment now. */
955 if (dont_output_data
&& DECL_SIZE (decl
) == 0
956 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
957 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
959 /* Some object file formats have a maximum alignment which they support.
960 In particular, a.out format supports a maximum alignment of 4. */
961 if (align
> MAX_OFILE_ALIGNMENT
)
963 warning (0, "alignment of %q+D is greater than maximum object "
964 "file alignment. Using %d", decl
,
965 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
966 align
= MAX_OFILE_ALIGNMENT
;
969 if (! DECL_USER_ALIGN (decl
))
971 #ifdef DATA_ABI_ALIGNMENT
972 unsigned int data_abi_align
973 = DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
974 /* For backwards compatibility, don't assume the ABI alignment for
976 if (! DECL_THREAD_LOCAL_P (decl
) || data_abi_align
<= BITS_PER_WORD
)
977 align
= data_abi_align
;
980 /* On some machines, it is good to increase alignment sometimes.
981 But as DECL_ALIGN is used both for actually emitting the variable
982 and for code accessing the variable as guaranteed alignment, we
983 can only increase the alignment if it is a performance optimization
984 if the references to it must bind to the current definition. */
985 if (decl_binds_to_current_def_p (decl
))
987 #ifdef DATA_ALIGNMENT
988 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
989 /* Don't increase alignment too much for TLS variables - TLS space
991 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
994 #ifdef CONSTANT_ALIGNMENT
995 if (DECL_INITIAL (decl
) != 0
996 && DECL_INITIAL (decl
) != error_mark_node
)
998 unsigned int const_align
999 = CONSTANT_ALIGNMENT (DECL_INITIAL (decl
), align
);
1000 /* Don't increase alignment too much for TLS variables - TLS
1001 space is too precious. */
1002 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1003 align
= const_align
;
1009 /* Reset the alignment in case we have made it tighter, so we can benefit
1010 from it in get_pointer_alignment. */
1011 DECL_ALIGN (decl
) = align
;
1014 /* Return DECL_ALIGN (decl), possibly increased for optimization purposes
1015 beyond what align_variable returned. */
1018 get_variable_align (tree decl
)
1020 unsigned int align
= DECL_ALIGN (decl
);
1022 /* For user aligned vars or static vars align_variable already did
1024 if (DECL_USER_ALIGN (decl
) || !TREE_PUBLIC (decl
))
1027 #ifdef DATA_ABI_ALIGNMENT
1028 if (DECL_THREAD_LOCAL_P (decl
))
1029 align
= DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1032 /* For decls that bind to the current definition, align_variable
1033 did also everything, except for not assuming ABI required alignment
1034 of TLS variables. For other vars, increase the alignment here
1035 as an optimization. */
1036 if (!decl_binds_to_current_def_p (decl
))
1038 /* On some machines, it is good to increase alignment sometimes. */
1039 #ifdef DATA_ALIGNMENT
1040 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1041 /* Don't increase alignment too much for TLS variables - TLS space
1043 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1046 #ifdef CONSTANT_ALIGNMENT
1047 if (DECL_INITIAL (decl
) != 0 && DECL_INITIAL (decl
) != error_mark_node
)
1049 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
1051 /* Don't increase alignment too much for TLS variables - TLS space
1053 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1054 align
= const_align
;
1062 /* Return the section into which the given VAR_DECL or CONST_DECL
1063 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1064 section should be used wherever possible. */
1067 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1069 addr_space_t as
= ADDR_SPACE_GENERIC
;
1072 if (TREE_TYPE (decl
) != error_mark_node
)
1073 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1075 if (DECL_COMMON (decl
))
1077 /* If the decl has been given an explicit section name, or it resides
1078 in a non-generic address space, then it isn't common, and shouldn't
1079 be handled as such. */
1080 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1081 && ADDR_SPACE_GENERIC_P (as
));
1082 if (DECL_THREAD_LOCAL_P (decl
))
1083 return tls_comm_section
;
1084 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1085 return comm_section
;
1088 if (DECL_INITIAL (decl
) == error_mark_node
)
1089 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1090 else if (DECL_INITIAL (decl
))
1091 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1095 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1096 if (IN_NAMED_SECTION (decl
))
1097 return get_named_section (decl
, NULL
, reloc
);
1099 if (ADDR_SPACE_GENERIC_P (as
)
1100 && !DECL_THREAD_LOCAL_P (decl
)
1101 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1102 && bss_initializer_p (decl
))
1104 if (!TREE_PUBLIC (decl
)
1105 && !((flag_sanitize
& SANITIZE_ADDRESS
)
1106 && asan_protect_global (decl
)))
1107 return lcomm_section
;
1108 if (bss_noswitch_section
)
1109 return bss_noswitch_section
;
1112 return targetm
.asm_out
.select_section (decl
, reloc
,
1113 get_variable_align (decl
));
1116 /* Return the block into which object_block DECL should be placed. */
1118 static struct object_block
*
1119 get_block_for_decl (tree decl
)
1123 if (TREE_CODE (decl
) == VAR_DECL
)
1125 /* The object must be defined in this translation unit. */
1126 if (DECL_EXTERNAL (decl
))
1129 /* There's no point using object blocks for something that is
1130 isolated by definition. */
1131 if (DECL_ONE_ONLY (decl
))
1135 /* We can only calculate block offsets if the decl has a known
1137 if (DECL_SIZE_UNIT (decl
) == NULL
)
1139 if (!tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
)))
1142 /* Find out which section should contain DECL. We cannot put it into
1143 an object block if it requires a standalone definition. */
1144 if (TREE_CODE (decl
) == VAR_DECL
)
1145 align_variable (decl
, 0);
1146 sect
= get_variable_section (decl
, true);
1147 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1150 return get_block_for_section (sect
);
1153 /* Make sure block symbol SYMBOL is in block BLOCK. */
1156 change_symbol_block (rtx symbol
, struct object_block
*block
)
1158 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1160 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1161 SYMBOL_REF_BLOCK (symbol
) = block
;
1165 /* Return true if it is possible to put DECL in an object_block. */
1168 use_blocks_for_decl_p (tree decl
)
1170 /* Only data DECLs can be placed into object blocks. */
1171 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1174 /* Detect decls created by dw2_force_const_mem. Such decls are
1175 special because DECL_INITIAL doesn't specify the decl's true value.
1176 dw2_output_indirect_constants will instead call assemble_variable
1177 with dont_output_data set to 1 and then print the contents itself. */
1178 if (DECL_INITIAL (decl
) == decl
)
1181 /* If this decl is an alias, then we don't want to emit a
1183 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)))
1186 return targetm
.use_blocks_for_decl_p (decl
);
1189 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1190 have static storage duration. In other words, it should not be an
1191 automatic variable, including PARM_DECLs.
1193 There is, however, one exception: this function handles variables
1194 explicitly placed in a particular register by the user.
1196 This is never called for PARM_DECL nodes. */
1199 make_decl_rtl (tree decl
)
1201 const char *name
= 0;
1205 /* Check that we are not being given an automatic variable. */
1206 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1207 && TREE_CODE (decl
) != RESULT_DECL
);
1209 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1210 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1211 || TREE_STATIC (decl
)
1212 || TREE_PUBLIC (decl
)
1213 || DECL_EXTERNAL (decl
)
1214 || DECL_REGISTER (decl
));
1216 /* And that we were not given a type or a label. */
1217 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1218 && TREE_CODE (decl
) != LABEL_DECL
);
1220 /* For a duplicate declaration, we can be called twice on the
1221 same DECL node. Don't discard the RTL already made. */
1222 if (DECL_RTL_SET_P (decl
))
1224 /* If the old RTL had the wrong mode, fix the mode. */
1225 x
= DECL_RTL (decl
);
1226 if (GET_MODE (x
) != DECL_MODE (decl
))
1227 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1229 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1232 /* ??? Another way to do this would be to maintain a hashed
1233 table of such critters. Instead of adding stuff to a DECL
1234 to give certain attributes to it, we could use an external
1235 hash map from DECL to set of attributes. */
1237 /* Let the target reassign the RTL if it wants.
1238 This is necessary, for example, when one machine specific
1239 decl attribute overrides another. */
1240 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1242 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1243 on the new decl information. */
1245 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1246 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1247 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1252 /* If this variable belongs to the global constant pool, retrieve the
1253 pre-computed RTL or recompute it in LTO mode. */
1254 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_IN_CONSTANT_POOL (decl
))
1256 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1260 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
1262 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1263 && DECL_REGISTER (decl
))
1265 error ("register name not specified for %q+D", decl
);
1267 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1269 const char *asmspec
= name
+1;
1270 enum machine_mode mode
= DECL_MODE (decl
);
1271 reg_number
= decode_reg_name (asmspec
);
1272 /* First detect errors in declaring global registers. */
1273 if (reg_number
== -1)
1274 error ("register name not specified for %q+D", decl
);
1275 else if (reg_number
< 0)
1276 error ("invalid register name for %q+D", decl
);
1277 else if (mode
== BLKmode
)
1278 error ("data type of %q+D isn%'t suitable for a register",
1280 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1281 error ("the register specified for %q+D cannot be accessed"
1282 " by the current target", decl
);
1283 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1284 error ("the register specified for %q+D is not general enough"
1285 " to be used as a register variable", decl
);
1286 else if (!HARD_REGNO_MODE_OK (reg_number
, mode
))
1287 error ("register specified for %q+D isn%'t suitable for data type",
1289 /* Now handle properly declared static register variables. */
1294 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1296 DECL_INITIAL (decl
) = 0;
1297 error ("global register variable has initial value");
1299 if (TREE_THIS_VOLATILE (decl
))
1300 warning (OPT_Wvolatile_register_var
,
1301 "optimization may eliminate reads and/or "
1302 "writes to register variables");
1304 /* If the user specified one of the eliminables registers here,
1305 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1306 confused with that register and be eliminated. This usage is
1307 somewhat suspect... */
1309 SET_DECL_RTL (decl
, gen_rtx_raw_REG (mode
, reg_number
));
1310 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1311 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1313 if (TREE_STATIC (decl
))
1315 /* Make this register global, so not usable for anything
1317 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1318 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1319 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1321 nregs
= hard_regno_nregs
[reg_number
][mode
];
1323 globalize_reg (decl
, reg_number
+ --nregs
);
1326 /* As a register variable, it has no section. */
1330 /* Now handle ordinary static variables and functions (in memory).
1331 Also handle vars declared register invalidly. */
1332 else if (name
[0] == '*')
1334 #ifdef REGISTER_PREFIX
1335 if (strlen (REGISTER_PREFIX
) != 0)
1337 reg_number
= decode_reg_name (name
);
1338 if (reg_number
>= 0 || reg_number
== -3)
1339 error ("register name given for non-register variable %q+D", decl
);
1344 /* Specifying a section attribute on a variable forces it into a
1345 non-.bss section, and thus it cannot be common. */
1346 /* FIXME: In general this code should not be necessary because
1347 visibility pass is doing the same work. But notice_global_symbol
1348 is called early and it needs to make DECL_RTL to get the name.
1349 we take care of recomputing the DECL_RTL after visibility is changed. */
1350 if (TREE_CODE (decl
) == VAR_DECL
1351 && DECL_SECTION_NAME (decl
) != NULL_TREE
1352 && DECL_INITIAL (decl
) == NULL_TREE
1353 && DECL_COMMON (decl
))
1354 DECL_COMMON (decl
) = 0;
1356 /* Variables can't be both common and weak. */
1357 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1358 DECL_COMMON (decl
) = 0;
1360 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1361 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1364 enum machine_mode address_mode
= Pmode
;
1365 if (TREE_TYPE (decl
) != error_mark_node
)
1367 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1368 address_mode
= targetm
.addr_space
.address_mode (as
);
1370 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1372 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1373 SET_SYMBOL_REF_DECL (x
, decl
);
1375 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1376 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1377 set_mem_attributes (x
, decl
, 1);
1378 SET_DECL_RTL (decl
, x
);
1380 /* Optionally set flags or add text to the name to record information
1381 such as that it is a function name.
1382 If the name is changed, the macro ASM_OUTPUT_LABELREF
1383 will have to know how to strip this information. */
1384 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1387 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1388 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1392 make_decl_rtl_for_debug (tree decl
)
1394 unsigned int save_aliasing_flag
;
1397 if (DECL_RTL_SET_P (decl
))
1398 return DECL_RTL (decl
);
1400 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1401 call new_alias_set. If running with -fcompare-debug, sometimes
1402 we do not want to create alias sets that will throw the alias
1403 numbers off in the comparison dumps. So... clearing
1404 flag_strict_aliasing will keep new_alias_set() from creating a
1406 save_aliasing_flag
= flag_strict_aliasing
;
1407 flag_strict_aliasing
= 0;
1409 rtl
= DECL_RTL (decl
);
1410 /* Reset DECL_RTL back, as various parts of the compiler expects
1411 DECL_RTL set meaning it is actually going to be output. */
1412 SET_DECL_RTL (decl
, NULL
);
1414 flag_strict_aliasing
= save_aliasing_flag
;
1418 /* Output a string of literal assembler code
1419 for an `asm' keyword used between functions. */
1422 assemble_asm (tree string
)
1427 if (TREE_CODE (string
) == ADDR_EXPR
)
1428 string
= TREE_OPERAND (string
, 0);
1430 p
= TREE_STRING_POINTER (string
);
1431 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1434 /* Write the address of the entity given by SYMBOL to SEC. */
1436 assemble_addr_to_section (rtx symbol
, section
*sec
)
1438 switch_to_section (sec
);
1439 assemble_align (POINTER_SIZE
);
1440 assemble_integer (symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1443 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1444 not) section for PRIORITY. */
1446 get_cdtor_priority_section (int priority
, bool constructor_p
)
1450 /* ??? This only works reliably with the GNU linker. */
1451 sprintf (buf
, "%s.%.5u",
1452 constructor_p
? ".ctors" : ".dtors",
1453 /* Invert the numbering so the linker puts us in the proper
1454 order; constructors are run from right to left, and the
1455 linker sorts in increasing order. */
1456 MAX_INIT_PRIORITY
- priority
);
1457 return get_section (buf
, SECTION_WRITE
, NULL
);
1461 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1465 if (priority
!= DEFAULT_INIT_PRIORITY
)
1466 sec
= get_cdtor_priority_section (priority
,
1467 /*constructor_p=*/false);
1469 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1471 assemble_addr_to_section (symbol
, sec
);
1474 #ifdef DTORS_SECTION_ASM_OP
1476 default_dtor_section_asm_out_destructor (rtx symbol
,
1477 int priority ATTRIBUTE_UNUSED
)
1479 assemble_addr_to_section (symbol
, dtors_section
);
1484 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1488 if (priority
!= DEFAULT_INIT_PRIORITY
)
1489 sec
= get_cdtor_priority_section (priority
,
1490 /*constructor_p=*/true);
1492 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1494 assemble_addr_to_section (symbol
, sec
);
1497 #ifdef CTORS_SECTION_ASM_OP
1499 default_ctor_section_asm_out_constructor (rtx symbol
,
1500 int priority ATTRIBUTE_UNUSED
)
1502 assemble_addr_to_section (symbol
, ctors_section
);
1506 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1507 a nonzero value if the constant pool should be output before the
1508 start of the function, or a zero value if the pool should output
1509 after the end of the function. The default is to put it before the
1512 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1513 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1516 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1517 to be output to assembler.
1518 Set first_global_object_name and weak_global_object_name as appropriate. */
1521 notice_global_symbol (tree decl
)
1523 const char **type
= &first_global_object_name
;
1525 if (first_global_object_name
1526 || !TREE_PUBLIC (decl
)
1527 || DECL_EXTERNAL (decl
)
1528 || !DECL_NAME (decl
)
1529 || (TREE_CODE (decl
) != FUNCTION_DECL
1530 && (TREE_CODE (decl
) != VAR_DECL
1531 || (DECL_COMMON (decl
)
1532 && (DECL_INITIAL (decl
) == 0
1533 || DECL_INITIAL (decl
) == error_mark_node
))))
1534 || !MEM_P (DECL_RTL (decl
)))
1537 /* We win when global object is found, but it is useful to know about weak
1538 symbol as well so we can produce nicer unique names. */
1539 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1540 type
= &weak_global_object_name
;
1546 rtx decl_rtl
= DECL_RTL (decl
);
1548 p
= targetm
.strip_name_encoding (XSTR (XEXP (decl_rtl
, 0), 0));
1549 name
= ggc_strdup (p
);
1555 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1556 current function goes into the cold section, so that targets can use
1557 current_function_section during RTL expansion. DECL describes the
1561 decide_function_section (tree decl
)
1563 first_function_block_is_cold
= false;
1565 if (flag_reorder_blocks_and_partition
)
1566 /* We will decide in assemble_start_function. */
1569 if (DECL_SECTION_NAME (decl
))
1571 struct cgraph_node
*node
= cgraph_get_node (current_function_decl
);
1572 /* Calls to function_section rely on first_function_block_is_cold
1574 first_function_block_is_cold
= (node
1576 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1579 in_cold_section_p
= first_function_block_is_cold
;
1582 /* Output assembler code for the constant pool of a function and associated
1583 with defining the name of the function. DECL describes the function.
1584 NAME is the function's name. For the constant pool, we use the current
1585 constant pool data. */
1588 assemble_start_function (tree decl
, const char *fnname
)
1591 char tmp_label
[100];
1592 bool hot_label_written
= false;
1594 if (flag_reorder_blocks_and_partition
)
1596 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1597 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1598 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1599 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1600 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1601 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1602 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1603 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1608 crtl
->subsections
.hot_section_label
= NULL
;
1609 crtl
->subsections
.cold_section_label
= NULL
;
1610 crtl
->subsections
.hot_section_end_label
= NULL
;
1611 crtl
->subsections
.cold_section_end_label
= NULL
;
1614 /* The following code does not need preprocessing in the assembler. */
1618 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1619 output_constant_pool (fnname
, decl
);
1621 /* Make sure the not and cold text (code) sections are properly
1622 aligned. This is necessary here in the case where the function
1623 has both hot and cold sections, because we don't want to re-set
1624 the alignment when the section switch happens mid-function. */
1626 if (flag_reorder_blocks_and_partition
)
1628 first_function_block_is_cold
= false;
1630 switch_to_section (unlikely_text_section ());
1631 assemble_align (DECL_ALIGN (decl
));
1632 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1634 /* When the function starts with a cold section, we need to explicitly
1635 align the hot section and write out the hot section label.
1636 But if the current function is a thunk, we do not have a CFG. */
1638 && BB_PARTITION (ENTRY_BLOCK_PTR
->next_bb
) == BB_COLD_PARTITION
)
1640 switch_to_section (text_section
);
1641 assemble_align (DECL_ALIGN (decl
));
1642 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1643 hot_label_written
= true;
1644 first_function_block_is_cold
= true;
1646 in_cold_section_p
= first_function_block_is_cold
;
1650 /* Switch to the correct text section for the start of the function. */
1652 switch_to_section (function_section (decl
));
1653 if (flag_reorder_blocks_and_partition
1654 && !hot_label_written
)
1655 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1657 /* Tell assembler to move to target machine's alignment for functions. */
1658 align
= floor_log2 (DECL_ALIGN (decl
) / BITS_PER_UNIT
);
1661 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1664 /* Handle a user-specified function alignment.
1665 Note that we still need to align to DECL_ALIGN, as above,
1666 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1667 if (! DECL_USER_ALIGN (decl
)
1668 && align_functions_log
> align
1669 && optimize_function_for_speed_p (cfun
))
1671 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1672 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1673 align_functions_log
, align_functions
- 1);
1675 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1679 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1680 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1683 if (!DECL_IGNORED_P (decl
))
1684 (*debug_hooks
->begin_function
) (decl
);
1686 /* Make function name accessible from other files, if appropriate. */
1688 if (TREE_PUBLIC (decl
))
1690 notice_global_symbol (decl
);
1692 globalize_decl (decl
);
1694 maybe_assemble_visibility (decl
);
1697 if (DECL_PRESERVE_P (decl
))
1698 targetm
.asm_out
.mark_decl_preserved (fnname
);
1700 /* Do any machine/system dependent processing of the function name. */
1701 #ifdef ASM_DECLARE_FUNCTION_NAME
1702 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1704 /* Standard thing is just output label for the function. */
1705 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1706 #endif /* ASM_DECLARE_FUNCTION_NAME */
1708 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1709 saw_no_split_stack
= true;
1712 /* Output assembler code associated with defining the size of the
1713 function. DECL describes the function. NAME is the function's name. */
1716 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1718 #ifdef ASM_DECLARE_FUNCTION_SIZE
1719 /* We could have switched section in the middle of the function. */
1720 if (flag_reorder_blocks_and_partition
)
1721 switch_to_section (function_section (decl
));
1722 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1724 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1726 output_constant_pool (fnname
, decl
);
1727 switch_to_section (function_section (decl
)); /* need to switch back */
1729 /* Output labels for end of hot/cold text sections (to be used by
1731 if (flag_reorder_blocks_and_partition
)
1733 section
*save_text_section
;
1735 save_text_section
= in_section
;
1736 switch_to_section (unlikely_text_section ());
1737 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1738 if (first_function_block_is_cold
)
1739 switch_to_section (text_section
);
1741 switch_to_section (function_section (decl
));
1742 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1743 switch_to_section (save_text_section
);
1747 /* Assemble code to leave SIZE bytes of zeros. */
1750 assemble_zeros (unsigned HOST_WIDE_INT size
)
1752 /* Do no output if -fsyntax-only. */
1753 if (flag_syntax_only
)
1756 #ifdef ASM_NO_SKIP_IN_TEXT
1757 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1758 so we must output 0s explicitly in the text section. */
1759 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1761 unsigned HOST_WIDE_INT i
;
1762 for (i
= 0; i
< size
; i
++)
1763 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1768 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1771 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1774 assemble_align (int align
)
1776 if (align
> BITS_PER_UNIT
)
1778 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1782 /* Assemble a string constant with the specified C string as contents. */
1785 assemble_string (const char *p
, int size
)
1790 /* If the string is very long, split it up. */
1794 int thissize
= size
- pos
;
1795 if (thissize
> maximum
)
1798 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1806 /* A noswitch_section_callback for lcomm_section. */
1809 emit_local (tree decl ATTRIBUTE_UNUSED
,
1810 const char *name ATTRIBUTE_UNUSED
,
1811 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1812 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1814 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1815 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1816 size
, DECL_ALIGN (decl
));
1818 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1819 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1822 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1827 /* A noswitch_section_callback for bss_noswitch_section. */
1829 #if defined ASM_OUTPUT_ALIGNED_BSS
1831 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1832 const char *name ATTRIBUTE_UNUSED
,
1833 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1834 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1836 #if defined ASM_OUTPUT_ALIGNED_BSS
1837 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
,
1838 get_variable_align (decl
));
1844 /* A noswitch_section_callback for comm_section. */
1847 emit_common (tree decl ATTRIBUTE_UNUSED
,
1848 const char *name ATTRIBUTE_UNUSED
,
1849 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1850 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1852 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1853 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1854 size
, get_variable_align (decl
));
1856 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1857 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
,
1858 get_variable_align (decl
));
1861 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1866 /* A noswitch_section_callback for tls_comm_section. */
1869 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1870 const char *name ATTRIBUTE_UNUSED
,
1871 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1872 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1874 #ifdef ASM_OUTPUT_TLS_COMMON
1875 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
1878 sorry ("thread-local COMMON data not implemented");
1883 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1884 NAME is the name of DECL's SYMBOL_REF. */
1887 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
,
1890 unsigned HOST_WIDE_INT size
, rounded
;
1892 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
1895 if ((flag_sanitize
& SANITIZE_ADDRESS
) && asan_protect_global (decl
))
1896 size
+= asan_red_zone_size (size
);
1898 /* Don't allocate zero bytes of common,
1899 since that means "undefined external" in the linker. */
1903 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1904 so that each uninitialized object starts on such a boundary. */
1905 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
1906 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
1907 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
1909 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
1910 && (unsigned HOST_WIDE_INT
) (align
/ BITS_PER_UNIT
) > rounded
)
1911 warning (0, "requested alignment for %q+D is greater than "
1912 "implemented alignment of %wu", decl
, rounded
);
1915 /* A subroutine of assemble_variable. Output the label and contents of
1916 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1917 is as for assemble_variable. */
1920 assemble_variable_contents (tree decl
, const char *name
,
1921 bool dont_output_data
)
1923 /* Do any machine/system dependent processing of the object. */
1924 #ifdef ASM_DECLARE_OBJECT_NAME
1925 last_assemble_variable_decl
= decl
;
1926 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
1928 /* Standard thing is just output label for the object. */
1929 ASM_OUTPUT_LABEL (asm_out_file
, name
);
1930 #endif /* ASM_DECLARE_OBJECT_NAME */
1932 if (!dont_output_data
)
1934 if (DECL_INITIAL (decl
)
1935 && DECL_INITIAL (decl
) != error_mark_node
1936 && !initializer_zerop (DECL_INITIAL (decl
)))
1937 /* Output the actual data. */
1938 output_constant (DECL_INITIAL (decl
),
1939 tree_low_cst (DECL_SIZE_UNIT (decl
), 1),
1940 get_variable_align (decl
));
1942 /* Leave space for it. */
1943 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl
), 1));
1947 /* Assemble everything that is needed for a variable or function declaration.
1948 Not used for automatic variables, and not used for function definitions.
1949 Should not be called for variables of incomplete structure type.
1951 TOP_LEVEL is nonzero if this variable has file scope.
1952 AT_END is nonzero if this is the special handling, at end of compilation,
1953 to define things that have had only tentative definitions.
1954 DONT_OUTPUT_DATA if nonzero means don't actually output the
1955 initial value (that will be done by the caller). */
1958 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
1959 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
1962 rtx decl_rtl
, symbol
;
1965 bool asan_protected
= false;
1967 /* This function is supposed to handle VARIABLES. Ensure we have one. */
1968 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
1970 /* Emulated TLS had better not get this far. */
1971 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
1973 last_assemble_variable_decl
= 0;
1975 /* Normally no need to say anything here for external references,
1976 since assemble_external is called by the language-specific code
1977 when a declaration is first seen. */
1979 if (DECL_EXTERNAL (decl
))
1982 /* Do nothing for global register variables. */
1983 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
1985 TREE_ASM_WRITTEN (decl
) = 1;
1989 /* If type was incomplete when the variable was declared,
1990 see if it is complete now. */
1992 if (DECL_SIZE (decl
) == 0)
1993 layout_decl (decl
, 0);
1995 /* Still incomplete => don't allocate it; treat the tentative defn
1996 (which is what it must have been) as an `extern' reference. */
1998 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2000 error ("storage size of %q+D isn%'t known", decl
);
2001 TREE_ASM_WRITTEN (decl
) = 1;
2005 /* The first declaration of a variable that comes through this function
2006 decides whether it is global (in C, has external linkage)
2007 or local (in C, has internal linkage). So do nothing more
2008 if this function has already run. */
2010 if (TREE_ASM_WRITTEN (decl
))
2013 /* Make sure targetm.encode_section_info is invoked before we set
2015 decl_rtl
= DECL_RTL (decl
);
2017 TREE_ASM_WRITTEN (decl
) = 1;
2019 /* Do no output if -fsyntax-only. */
2020 if (flag_syntax_only
)
2023 if (! dont_output_data
2024 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
2026 error ("size of variable %q+D is too large", decl
);
2030 gcc_assert (MEM_P (decl_rtl
));
2031 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2032 symbol
= XEXP (decl_rtl
, 0);
2034 /* If this symbol belongs to the tree constant pool, output the constant
2035 if it hasn't already been written. */
2036 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
2038 tree decl
= SYMBOL_REF_DECL (symbol
);
2039 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
2040 output_constant_def_contents (symbol
);
2046 name
= XSTR (symbol
, 0);
2047 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2048 notice_global_symbol (decl
);
2050 /* Compute the alignment of this data. */
2052 align_variable (decl
, dont_output_data
);
2054 if ((flag_sanitize
& SANITIZE_ADDRESS
)
2055 && asan_protect_global (decl
))
2057 asan_protected
= true;
2058 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
2059 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
2062 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2064 align
= get_variable_align (decl
);
2066 if (TREE_PUBLIC (decl
))
2067 maybe_assemble_visibility (decl
);
2069 if (DECL_PRESERVE_P (decl
))
2070 targetm
.asm_out
.mark_decl_preserved (name
);
2072 /* First make the assembler name(s) global if appropriate. */
2073 sect
= get_variable_section (decl
, false);
2074 if (TREE_PUBLIC (decl
)
2075 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2076 globalize_decl (decl
);
2078 /* Output any data that we will need to use the address of. */
2079 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2080 output_addressed_constants (DECL_INITIAL (decl
));
2082 /* dbxout.c needs to know this. */
2083 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2084 DECL_IN_TEXT_SECTION (decl
) = 1;
2086 /* If the decl is part of an object_block, make sure that the decl
2087 has been positioned within its block, but do not write out its
2088 definition yet. output_object_blocks will do that later. */
2089 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2091 gcc_assert (!dont_output_data
);
2092 place_block_symbol (symbol
);
2094 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2095 assemble_noswitch_variable (decl
, name
, sect
, align
);
2098 /* The following bit of code ensures that vtable_map
2099 variables are not only in the comdat section, but that
2100 each variable has its own unique comdat name. If this
2101 code is removed, the variables end up in the same section
2102 with a single comdat name.
2104 FIXME: resolve_unique_section needs to deal better with
2105 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
2106 that is fixed, this if-else statement can be replaced with
2107 a single call to "switch_to_section (sect)". */
2108 if (sect
->named
.name
2109 && (strcmp (sect
->named
.name
, ".vtable_map_vars") == 0))
2111 #if defined (OBJECT_FORMAT_ELF)
2112 targetm
.asm_out
.named_section (sect
->named
.name
,
2113 sect
->named
.common
.flags
2118 switch_to_section (sect
);
2122 switch_to_section (sect
);
2123 if (align
> BITS_PER_UNIT
)
2124 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
2125 assemble_variable_contents (decl
, name
, dont_output_data
);
2128 unsigned HOST_WIDE_INT
int size
2129 = tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
2130 assemble_zeros (asan_red_zone_size (size
));
2136 /* Given a function declaration (FN_DECL), this function assembles the
2137 function into the .preinit_array section. */
2140 assemble_vtv_preinit_initializer (tree fn_decl
)
2143 unsigned flags
= SECTION_WRITE
;
2144 rtx symbol
= XEXP (DECL_RTL (fn_decl
), 0);
2146 flags
|= SECTION_NOTYPE
;
2147 sect
= get_section (".preinit_array", flags
, fn_decl
);
2148 switch_to_section (sect
);
2149 assemble_addr_to_section (symbol
, sect
);
2152 /* Return 1 if type TYPE contains any pointers. */
2155 contains_pointers_p (tree type
)
2157 switch (TREE_CODE (type
))
2160 case REFERENCE_TYPE
:
2161 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2162 so I'll play safe and return 1. */
2168 case QUAL_UNION_TYPE
:
2171 /* For a type that has fields, see if the fields have pointers. */
2172 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2173 if (TREE_CODE (fields
) == FIELD_DECL
2174 && contains_pointers_p (TREE_TYPE (fields
)))
2180 /* An array type contains pointers if its element type does. */
2181 return contains_pointers_p (TREE_TYPE (type
));
2188 /* We delay assemble_external processing until
2189 the compilation unit is finalized. This is the best we can do for
2190 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2191 it all the way to final. See PR 17982 for further discussion. */
2192 static GTY(()) tree pending_assemble_externals
;
2194 #ifdef ASM_OUTPUT_EXTERNAL
2195 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2196 As a result, assemble_external can be called after the list of externals
2197 is processed and the pointer set destroyed. */
2198 static bool pending_assemble_externals_processed
;
2200 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2201 TREE_LIST in assemble_external. */
2202 static struct pointer_set_t
*pending_assemble_externals_set
;
2204 /* True if DECL is a function decl for which no out-of-line copy exists.
2205 It is assumed that DECL's assembler name has been set. */
2208 incorporeal_function_p (tree decl
)
2210 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2214 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2215 && (DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
2216 || DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA_WITH_ALIGN
))
2219 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2220 /* Atomic or sync builtins which have survived this far will be
2221 resolved externally and therefore are not incorporeal. */
2222 if (strncmp (name
, "__builtin_", 10) == 0)
2228 /* Actually do the tests to determine if this is necessary, and invoke
2229 ASM_OUTPUT_EXTERNAL. */
2231 assemble_external_real (tree decl
)
2233 rtx rtl
= DECL_RTL (decl
);
2235 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2236 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2237 && !incorporeal_function_p (decl
))
2239 /* Some systems do require some output. */
2240 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2241 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2247 process_pending_assemble_externals (void)
2249 #ifdef ASM_OUTPUT_EXTERNAL
2251 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2252 assemble_external_real (TREE_VALUE (list
));
2254 pending_assemble_externals
= 0;
2255 pending_assemble_externals_processed
= true;
2256 pointer_set_destroy (pending_assemble_externals_set
);
2260 /* This TREE_LIST contains any weak symbol declarations waiting
2262 static GTY(()) tree weak_decls
;
2264 /* Output something to declare an external symbol to the assembler,
2265 and qualifiers such as weakness. (Most assemblers don't need
2266 extern declaration, so we normally output nothing.) Do nothing if
2267 DECL is not external. */
2270 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2272 /* Make sure that the ASM_OUT_FILE is open.
2273 If it's not, we should not be calling this function. */
2274 gcc_assert (asm_out_file
);
2276 /* In a perfect world, the following condition would be true.
2277 Sadly, the Java and Go front ends emit assembly *from the front end*,
2278 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2280 /* This function should only be called if we are expanding, or have
2282 Ideally, only final.c would be calling this function, but it is
2283 not clear whether that would break things somehow. See PR 17982
2284 for further discussion. */
2285 gcc_assert (cgraph_state
== CGRAPH_STATE_EXPANSION
2286 || cgraph_state
== CGRAPH_STATE_FINISHED
);
2289 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2292 /* We want to output annotation for weak and external symbols at
2293 very last to check if they are references or not. */
2295 if (TARGET_SUPPORTS_WEAK
2297 /* TREE_STATIC is a weird and abused creature which is not
2298 generally the right test for whether an entity has been
2299 locally emitted, inlined or otherwise not-really-extern, but
2300 for declarations that can be weak, it happens to be
2302 && !TREE_STATIC (decl
)
2303 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2304 && value_member (decl
, weak_decls
) == NULL_TREE
)
2305 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2307 #ifdef ASM_OUTPUT_EXTERNAL
2308 if (pending_assemble_externals_processed
)
2310 assemble_external_real (decl
);
2314 if (! pointer_set_insert (pending_assemble_externals_set
, decl
))
2315 pending_assemble_externals
= tree_cons (NULL
, decl
,
2316 pending_assemble_externals
);
2320 /* Similar, for calling a library function FUN. */
2323 assemble_external_libcall (rtx fun
)
2325 /* Declare library function name external when first used, if nec. */
2326 if (! SYMBOL_REF_USED (fun
))
2328 SYMBOL_REF_USED (fun
) = 1;
2329 targetm
.asm_out
.external_libcall (fun
);
2333 /* Assemble a label named NAME. */
2336 assemble_label (FILE *file
, const char *name
)
2338 ASM_OUTPUT_LABEL (file
, name
);
2341 /* Set the symbol_referenced flag for ID. */
2343 mark_referenced (tree id
)
2345 TREE_SYMBOL_REFERENCED (id
) = 1;
2348 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2350 mark_decl_referenced (tree decl
)
2352 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2354 /* Extern inline functions don't become needed when referenced.
2355 If we know a method will be emitted in other TU and no new
2356 functions can be marked reachable, just use the external
2358 struct cgraph_node
*node
= cgraph_get_create_node (decl
);
2359 if (!DECL_EXTERNAL (decl
)
2360 && !node
->definition
)
2361 cgraph_mark_force_output_node (node
);
2363 else if (TREE_CODE (decl
) == VAR_DECL
)
2365 struct varpool_node
*node
= varpool_node_for_decl (decl
);
2366 /* C++ frontend use mark_decl_references to force COMDAT variables
2367 to be output that might appear dead otherwise. */
2368 node
->force_output
= true;
2370 /* else do nothing - we can get various sorts of CST nodes here,
2371 which do not need to be marked. */
2375 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2376 until we find an identifier that is not itself a transparent alias.
2377 Modify the alias passed to it by reference (and all aliases on the
2378 way to the ultimate target), such that they do not have to be
2379 followed again, and return the ultimate target of the alias
2383 ultimate_transparent_alias_target (tree
*alias
)
2385 tree target
= *alias
;
2387 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
2389 gcc_assert (TREE_CHAIN (target
));
2390 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
2391 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
2392 && ! TREE_CHAIN (target
));
2399 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2400 starts with a *, the rest of NAME is output verbatim. Otherwise
2401 NAME is transformed in a target-specific way (usually by the
2402 addition of an underscore). */
2405 assemble_name_raw (FILE *file
, const char *name
)
2408 fputs (&name
[1], file
);
2410 ASM_OUTPUT_LABELREF (file
, name
);
2413 /* Like assemble_name_raw, but should be used when NAME might refer to
2414 an entity that is also represented as a tree (like a function or
2415 variable). If NAME does refer to such an entity, that entity will
2416 be marked as referenced. */
2419 assemble_name (FILE *file
, const char *name
)
2421 const char *real_name
;
2424 real_name
= targetm
.strip_name_encoding (name
);
2426 id
= maybe_get_identifier (real_name
);
2431 mark_referenced (id
);
2432 ultimate_transparent_alias_target (&id
);
2434 name
= IDENTIFIER_POINTER (id
);
2435 gcc_assert (! TREE_CHAIN (id
));
2438 assemble_name_raw (file
, name
);
2441 /* Allocate SIZE bytes writable static space with a gensym name
2442 and return an RTX to refer to its address. */
2445 assemble_static_space (unsigned HOST_WIDE_INT size
)
2448 const char *namestring
;
2451 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2453 namestring
= ggc_strdup (name
);
2455 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2456 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2458 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2459 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2462 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2463 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2466 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2467 so that each uninitialized object starts on such a boundary. */
2468 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2469 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2470 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2471 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2472 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2473 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2480 /* Assemble the static constant template for function entry trampolines.
2481 This is done at most once per compilation.
2482 Returns an RTX for the address of the template. */
2484 static GTY(()) rtx initial_trampoline
;
2487 assemble_trampoline_template (void)
2494 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2496 if (initial_trampoline
)
2497 return initial_trampoline
;
2499 /* By default, put trampoline templates in read-only data section. */
2501 #ifdef TRAMPOLINE_SECTION
2502 switch_to_section (TRAMPOLINE_SECTION
);
2504 switch_to_section (readonly_data_section
);
2507 /* Write the assembler code to define one. */
2508 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2510 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2512 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2513 targetm
.asm_out
.trampoline_template (asm_out_file
);
2515 /* Record the rtl to refer to it. */
2516 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2517 name
= ggc_strdup (label
);
2518 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2519 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2521 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2522 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2523 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2525 return initial_trampoline
;
2528 /* A and B are either alignments or offsets. Return the minimum alignment
2529 that may be assumed after adding the two together. */
2531 static inline unsigned
2532 min_align (unsigned int a
, unsigned int b
)
2534 return (a
| b
) & -(a
| b
);
2537 /* Return the assembler directive for creating a given kind of integer
2538 object. SIZE is the number of bytes in the object and ALIGNED_P
2539 indicates whether it is known to be aligned. Return NULL if the
2540 assembly dialect has no such directive.
2542 The returned string should be printed at the start of a new line and
2543 be followed immediately by the object's initial value. */
2546 integer_asm_op (int size
, int aligned_p
)
2548 struct asm_int_op
*ops
;
2551 ops
= &targetm
.asm_out
.aligned_op
;
2553 ops
= &targetm
.asm_out
.unaligned_op
;
2558 return targetm
.asm_out
.byte_op
;
2572 /* Use directive OP to assemble an integer object X. Print OP at the
2573 start of the line, followed immediately by the value of X. */
2576 assemble_integer_with_op (const char *op
, rtx x
)
2578 fputs (op
, asm_out_file
);
2579 output_addr_const (asm_out_file
, x
);
2580 fputc ('\n', asm_out_file
);
2583 /* The default implementation of the asm_out.integer target hook. */
2586 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2587 unsigned int size ATTRIBUTE_UNUSED
,
2588 int aligned_p ATTRIBUTE_UNUSED
)
2590 const char *op
= integer_asm_op (size
, aligned_p
);
2591 /* Avoid GAS bugs for large values. Specifically negative values whose
2592 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2593 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE
/ BITS_PER_UNIT
)
2595 return op
&& (assemble_integer_with_op (op
, x
), true);
2598 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2599 the alignment of the integer in bits. Return 1 if we were able to output
2600 the constant, otherwise 0. We must be able to output the constant,
2601 if FORCE is nonzero. */
2604 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2608 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2610 /* See if the target hook can handle this kind of object. */
2611 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2614 /* If the object is a multi-byte one, try splitting it up. Split
2615 it into words it if is multi-word, otherwise split it into bytes. */
2618 enum machine_mode omode
, imode
;
2619 unsigned int subalign
;
2620 unsigned int subsize
, i
;
2621 enum mode_class mclass
;
2623 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2624 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2625 if (GET_CODE (x
) == CONST_FIXED
)
2626 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2630 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2631 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2633 for (i
= 0; i
< size
; i
+= subsize
)
2635 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2636 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2642 /* If we've printed some of it, but not all of it, there's no going
2647 gcc_assert (!force
);
2653 assemble_real (REAL_VALUE_TYPE d
, enum machine_mode mode
, unsigned int align
)
2655 long data
[4] = {0, 0, 0, 0};
2657 int bitsize
, nelts
, nunits
, units_per
;
2659 /* This is hairy. We have a quantity of known size. real_to_target
2660 will put it into an array of *host* longs, 32 bits per element
2661 (even if long is more than 32 bits). We need to determine the
2662 number of array elements that are occupied (nelts) and the number
2663 of *target* min-addressable units that will be occupied in the
2664 object file (nunits). We cannot assume that 32 divides the
2665 mode's bitsize (size * BITS_PER_UNIT) evenly.
2667 size * BITS_PER_UNIT is used here to make sure that padding bits
2668 (which might appear at either end of the value; real_to_target
2669 will include the padding bits in its output array) are included. */
2671 nunits
= GET_MODE_SIZE (mode
);
2672 bitsize
= nunits
* BITS_PER_UNIT
;
2673 nelts
= CEIL (bitsize
, 32);
2674 units_per
= 32 / BITS_PER_UNIT
;
2676 real_to_target (data
, &d
, mode
);
2678 /* Put out the first word with the specified alignment. */
2679 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2680 nunits
-= units_per
;
2682 /* Subsequent words need only 32-bit alignment. */
2683 align
= min_align (align
, 32);
2685 for (i
= 1; i
< nelts
; i
++)
2687 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2688 nunits
-= units_per
;
2692 /* Given an expression EXP with a constant value,
2693 reduce it to the sum of an assembler symbol and an integer.
2694 Store them both in the structure *VALUE.
2695 EXP must be reducible. */
2699 HOST_WIDE_INT offset
;
2703 decode_addr_const (tree exp
, struct addr_const
*value
)
2705 tree target
= TREE_OPERAND (exp
, 0);
2711 if (TREE_CODE (target
) == COMPONENT_REF
2712 && tree_fits_shwi_p (byte_position (TREE_OPERAND (target
, 1))))
2714 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2715 target
= TREE_OPERAND (target
, 0);
2717 else if (TREE_CODE (target
) == ARRAY_REF
2718 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2720 offset
+= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target
)), 1)
2721 * tree_to_shwi (TREE_OPERAND (target
, 1)));
2722 target
= TREE_OPERAND (target
, 0);
2724 else if (TREE_CODE (target
) == MEM_REF
2725 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2727 offset
+= mem_ref_offset (target
).low
;
2728 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2730 else if (TREE_CODE (target
) == INDIRECT_REF
2731 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2732 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2734 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2739 switch (TREE_CODE (target
))
2743 x
= DECL_RTL (target
);
2747 x
= gen_rtx_MEM (FUNCTION_MODE
,
2748 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2757 x
= output_constant_def (target
, 1);
2764 gcc_assert (MEM_P (x
));
2768 value
->offset
= offset
;
2772 static GTY((param_is (struct constant_descriptor_tree
)))
2773 htab_t const_desc_htab
;
2775 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2777 /* Constant pool accessor function. */
2780 constant_pool_htab (void)
2782 return const_desc_htab
;
2785 /* Compute a hash code for a constant expression. */
2788 const_desc_hash (const void *ptr
)
2790 return ((const struct constant_descriptor_tree
*)ptr
)->hash
;
2794 const_hash_1 (const tree exp
)
2799 enum tree_code code
= TREE_CODE (exp
);
2801 /* Either set P and LEN to the address and len of something to hash and
2802 exit the switch or return a value. */
2807 p
= (char *) &TREE_INT_CST (exp
);
2808 len
= sizeof TREE_INT_CST (exp
);
2812 return real_hash (TREE_REAL_CST_PTR (exp
));
2815 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2818 p
= TREE_STRING_POINTER (exp
);
2819 len
= TREE_STRING_LENGTH (exp
);
2823 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2824 + const_hash_1 (TREE_IMAGPART (exp
)));
2830 hi
= 7 + VECTOR_CST_NELTS (exp
);
2832 for (i
= 0; i
< VECTOR_CST_NELTS (exp
); ++i
)
2833 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ELT (exp
, i
));
2840 unsigned HOST_WIDE_INT idx
;
2843 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2845 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2847 hi
= hi
* 603 + const_hash_1 (value
);
2855 struct addr_const value
;
2857 decode_addr_const (exp
, &value
);
2858 switch (GET_CODE (value
.base
))
2861 /* Don't hash the address of the SYMBOL_REF;
2862 only use the offset and the symbol name. */
2864 p
= XSTR (value
.base
, 0);
2865 for (i
= 0; p
[i
] != 0; i
++)
2866 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2870 hi
= value
.offset
+ CODE_LABEL_NUMBER (XEXP (value
.base
, 0)) * 13;
2880 case POINTER_PLUS_EXPR
:
2882 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2883 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2886 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2889 /* A language specific constant. Just hash the code. */
2893 /* Compute hashing function. */
2895 for (i
= 0; i
< len
; i
++)
2896 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2901 /* Wrapper of compare_constant, for the htab interface. */
2903 const_desc_eq (const void *p1
, const void *p2
)
2905 const struct constant_descriptor_tree
*const c1
2906 = (const struct constant_descriptor_tree
*) p1
;
2907 const struct constant_descriptor_tree
*const c2
2908 = (const struct constant_descriptor_tree
*) p2
;
2909 if (c1
->hash
!= c2
->hash
)
2911 return compare_constant (c1
->value
, c2
->value
);
2914 /* Compare t1 and t2, and return 1 only if they are known to result in
2915 the same bit pattern on output. */
2918 compare_constant (const tree t1
, const tree t2
)
2920 enum tree_code typecode
;
2922 if (t1
== NULL_TREE
)
2923 return t2
== NULL_TREE
;
2924 if (t2
== NULL_TREE
)
2927 if (TREE_CODE (t1
) != TREE_CODE (t2
))
2930 switch (TREE_CODE (t1
))
2933 /* Integer constants are the same only if the same width of type. */
2934 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2936 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2938 return tree_int_cst_equal (t1
, t2
);
2941 /* Real constants are the same only if the same width of type. */
2942 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2945 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
2948 /* Fixed constants are the same only if the same width of type. */
2949 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2952 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
2955 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2958 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
2959 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
2960 TREE_STRING_LENGTH (t1
)));
2963 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
2964 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
2970 if (VECTOR_CST_NELTS (t1
) != VECTOR_CST_NELTS (t2
))
2973 for (i
= 0; i
< VECTOR_CST_NELTS (t1
); ++i
)
2974 if (!compare_constant (VECTOR_CST_ELT (t1
, i
),
2975 VECTOR_CST_ELT (t2
, i
)))
2983 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
2984 unsigned HOST_WIDE_INT idx
;
2986 typecode
= TREE_CODE (TREE_TYPE (t1
));
2987 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
2990 if (typecode
== ARRAY_TYPE
)
2992 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
2993 /* For arrays, check that the sizes all match. */
2994 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
2996 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
3001 /* For record and union constructors, require exact type
3003 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
3007 v1
= CONSTRUCTOR_ELTS (t1
);
3008 v2
= CONSTRUCTOR_ELTS (t2
);
3009 if (vec_safe_length (v1
) != vec_safe_length (v2
))
3012 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
3014 constructor_elt
*c1
= &(*v1
)[idx
];
3015 constructor_elt
*c2
= &(*v2
)[idx
];
3017 /* Check that each value is the same... */
3018 if (!compare_constant (c1
->value
, c2
->value
))
3020 /* ... and that they apply to the same fields! */
3021 if (typecode
== ARRAY_TYPE
)
3023 if (!compare_constant (c1
->index
, c2
->index
))
3028 if (c1
->index
!= c2
->index
)
3039 struct addr_const value1
, value2
;
3043 decode_addr_const (t1
, &value1
);
3044 decode_addr_const (t2
, &value2
);
3046 if (value1
.offset
!= value2
.offset
)
3049 code
= GET_CODE (value1
.base
);
3050 if (code
!= GET_CODE (value2
.base
))
3056 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3060 ret
= (CODE_LABEL_NUMBER (XEXP (value1
.base
, 0))
3061 == CODE_LABEL_NUMBER (XEXP (value2
.base
, 0)));
3071 case POINTER_PLUS_EXPR
:
3074 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3075 && compare_constant (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3078 case VIEW_CONVERT_EXPR
:
3079 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3088 /* Make a copy of the whole tree structure for a constant. This
3089 handles the same types of nodes that compare_constant handles. */
3092 copy_constant (tree exp
)
3094 switch (TREE_CODE (exp
))
3097 /* For ADDR_EXPR, we do not want to copy the decl whose address
3098 is requested. We do want to copy constants though. */
3099 if (CONSTANT_CLASS_P (TREE_OPERAND (exp
, 0)))
3100 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3101 copy_constant (TREE_OPERAND (exp
, 0)));
3103 return copy_node (exp
);
3109 return copy_node (exp
);
3112 return build_complex (TREE_TYPE (exp
),
3113 copy_constant (TREE_REALPART (exp
)),
3114 copy_constant (TREE_IMAGPART (exp
)));
3117 case POINTER_PLUS_EXPR
:
3119 return build2 (TREE_CODE (exp
), TREE_TYPE (exp
),
3120 copy_constant (TREE_OPERAND (exp
, 0)),
3121 copy_constant (TREE_OPERAND (exp
, 1)));
3124 case VIEW_CONVERT_EXPR
:
3125 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3126 copy_constant (TREE_OPERAND (exp
, 0)));
3129 return build_vector (TREE_TYPE (exp
), VECTOR_CST_ELTS (exp
));
3133 tree copy
= copy_node (exp
);
3134 vec
<constructor_elt
, va_gc
> *v
;
3135 unsigned HOST_WIDE_INT idx
;
3136 tree purpose
, value
;
3138 vec_alloc (v
, vec_safe_length (CONSTRUCTOR_ELTS (exp
)));
3139 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp
), idx
, purpose
, value
)
3141 constructor_elt ce
= {purpose
, copy_constant (value
)};
3144 CONSTRUCTOR_ELTS (copy
) = v
;
3153 /* Return the section into which constant EXP should be placed. */
3156 get_constant_section (tree exp
, unsigned int align
)
3158 return targetm
.asm_out
.select_section (exp
,
3159 compute_reloc_for_constant (exp
),
3163 /* Return the size of constant EXP in bytes. */
3165 static HOST_WIDE_INT
3166 get_constant_size (tree exp
)
3170 size
= int_size_in_bytes (TREE_TYPE (exp
));
3171 if (TREE_CODE (exp
) == STRING_CST
)
3172 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3176 /* Subroutine of output_constant_def:
3177 No constant equal to EXP is known to have been output.
3178 Make a constant descriptor to enter EXP in the hash table.
3179 Assign the label number and construct RTL to refer to the
3180 constant's location in memory.
3181 Caller is responsible for updating the hash table. */
3183 static struct constant_descriptor_tree
*
3184 build_constant_desc (tree exp
)
3186 struct constant_descriptor_tree
*desc
;
3192 desc
= ggc_alloc_constant_descriptor_tree ();
3193 desc
->value
= copy_constant (exp
);
3195 /* Create a string containing the label name, in LABEL. */
3196 labelno
= const_labelno
++;
3197 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3199 /* Construct the VAR_DECL associated with the constant. */
3200 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3202 DECL_ARTIFICIAL (decl
) = 1;
3203 DECL_IGNORED_P (decl
) = 1;
3204 TREE_READONLY (decl
) = 1;
3205 TREE_STATIC (decl
) = 1;
3206 TREE_ADDRESSABLE (decl
) = 1;
3207 /* We don't set the RTL yet as this would cause varpool to assume that the
3208 variable is referenced. Moreover, it would just be dropped in LTO mode.
3209 Instead we set the flag that will be recognized in make_decl_rtl. */
3210 DECL_IN_CONSTANT_POOL (decl
) = 1;
3211 DECL_INITIAL (decl
) = desc
->value
;
3212 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3213 architectures so use DATA_ALIGNMENT as well, except for strings. */
3214 if (TREE_CODE (exp
) == STRING_CST
)
3216 #ifdef CONSTANT_ALIGNMENT
3217 DECL_ALIGN (decl
) = CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
));
3221 align_variable (decl
, 0);
3223 /* Now construct the SYMBOL_REF and the MEM. */
3224 if (use_object_blocks_p ())
3226 section
*sect
= get_constant_section (exp
, DECL_ALIGN (decl
));
3227 symbol
= create_block_symbol (ggc_strdup (label
),
3228 get_block_for_section (sect
), -1);
3231 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3232 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3233 SET_SYMBOL_REF_DECL (symbol
, decl
);
3234 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3236 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3237 set_mem_attributes (rtl
, exp
, 1);
3238 set_mem_alias_set (rtl
, 0);
3239 set_mem_alias_set (rtl
, const_alias_set
);
3241 /* We cannot share RTX'es in pool entries.
3242 Mark this piece of RTL as required for unsharing. */
3243 RTX_FLAG (rtl
, used
) = 1;
3245 /* Set flags or add text to the name to record information, such as
3246 that it is a local symbol. If the name is changed, the macro
3247 ASM_OUTPUT_LABELREF will have to know how to strip this
3248 information. This call might invalidate our local variable
3249 SYMBOL; we can't use it afterward. */
3250 targetm
.encode_section_info (exp
, rtl
, true);
3257 /* Return an rtx representing a reference to constant data in memory
3258 for the constant expression EXP.
3260 If assembler code for such a constant has already been output,
3261 return an rtx to refer to it.
3262 Otherwise, output such a constant in memory
3263 and generate an rtx for it.
3265 If DEFER is nonzero, this constant can be deferred and output only
3266 if referenced in the function after all optimizations.
3268 `const_desc_table' records which constants already have label strings. */
3271 output_constant_def (tree exp
, int defer
)
3273 struct constant_descriptor_tree
*desc
;
3274 struct constant_descriptor_tree key
;
3277 /* Look up EXP in the table of constant descriptors. If we didn't find
3278 it, create a new one. */
3280 key
.hash
= const_hash_1 (exp
);
3281 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3283 desc
= (struct constant_descriptor_tree
*) *loc
;
3286 desc
= build_constant_desc (exp
);
3287 desc
->hash
= key
.hash
;
3291 maybe_output_constant_def_contents (desc
, defer
);
3295 /* Subroutine of output_constant_def: Decide whether or not we need to
3296 output the constant DESC now, and if so, do it. */
3298 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3301 rtx symbol
= XEXP (desc
->rtl
, 0);
3302 tree exp
= desc
->value
;
3304 if (flag_syntax_only
)
3307 if (TREE_ASM_WRITTEN (exp
))
3308 /* Already output; don't do it again. */
3311 /* We can always defer constants as long as the context allows
3315 /* Increment n_deferred_constants if it exists. It needs to be at
3316 least as large as the number of constants actually referred to
3317 by the function. If it's too small we'll stop looking too early
3318 and fail to emit constants; if it's too large we'll only look
3319 through the entire function when we could have stopped earlier. */
3321 n_deferred_constants
++;
3325 output_constant_def_contents (symbol
);
3328 /* Subroutine of output_constant_def_contents. Output the definition
3329 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3330 constant's alignment in bits. */
3333 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3337 size
= get_constant_size (exp
);
3339 /* Do any machine/system dependent processing of the constant. */
3340 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3342 /* Output the value of EXP. */
3343 output_constant (exp
, size
, align
);
3346 /* We must output the constant data referred to by SYMBOL; do so. */
3349 output_constant_def_contents (rtx symbol
)
3351 tree decl
= SYMBOL_REF_DECL (symbol
);
3352 tree exp
= DECL_INITIAL (decl
);
3354 bool asan_protected
= false;
3356 /* Make sure any other constants whose addresses appear in EXP
3357 are assigned label numbers. */
3358 output_addressed_constants (exp
);
3360 /* We are no longer deferring this constant. */
3361 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3363 if ((flag_sanitize
& SANITIZE_ADDRESS
)
3364 && TREE_CODE (exp
) == STRING_CST
3365 && asan_protect_global (exp
))
3367 asan_protected
= true;
3368 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
3369 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
3372 /* If the constant is part of an object block, make sure that the
3373 decl has been positioned within its block, but do not write out
3374 its definition yet. output_object_blocks will do that later. */
3375 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3376 place_block_symbol (symbol
);
3379 align
= DECL_ALIGN (decl
);
3380 switch_to_section (get_constant_section (exp
, align
));
3381 if (align
> BITS_PER_UNIT
)
3382 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3383 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3386 HOST_WIDE_INT size
= get_constant_size (exp
);
3387 assemble_zeros (asan_red_zone_size (size
));
3392 /* Look up EXP in the table of constant descriptors. Return the rtl
3393 if it has been emitted, else null. */
3396 lookup_constant_def (tree exp
)
3398 struct constant_descriptor_tree
*desc
;
3399 struct constant_descriptor_tree key
;
3402 key
.hash
= const_hash_1 (exp
);
3403 desc
= (struct constant_descriptor_tree
*)
3404 htab_find_with_hash (const_desc_htab
, &key
, key
.hash
);
3406 return (desc
? desc
->rtl
: NULL_RTX
);
3409 /* Return a tree representing a reference to constant data in memory
3410 for the constant expression EXP.
3412 This is the counterpart of output_constant_def at the Tree level. */
3415 tree_output_constant_def (tree exp
)
3417 struct constant_descriptor_tree
*desc
, key
;
3421 /* Look up EXP in the table of constant descriptors. If we didn't find
3422 it, create a new one. */
3424 key
.hash
= const_hash_1 (exp
);
3425 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3427 desc
= (struct constant_descriptor_tree
*) *loc
;
3430 desc
= build_constant_desc (exp
);
3431 desc
->hash
= key
.hash
;
3435 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3436 varpool_finalize_decl (decl
);
3440 /* Used in the hash tables to avoid outputting the same constant
3441 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3442 are output once per function, not once per file. */
3443 /* ??? Only a few targets need per-function constant pools. Most
3444 can use one per-file pool. Should add a targetm bit to tell the
3447 struct GTY(()) rtx_constant_pool
{
3448 /* Pointers to first and last constant in pool, as ordered by offset. */
3449 struct constant_descriptor_rtx
*first
;
3450 struct constant_descriptor_rtx
*last
;
3452 /* Hash facility for making memory-constants from constant rtl-expressions.
3453 It is used on RISC machines where immediate integer arguments and
3454 constant addresses are restricted so that such constants must be stored
3456 htab_t
GTY((param_is (struct constant_descriptor_rtx
))) const_rtx_htab
;
3458 /* Current offset in constant pool (does not include any
3459 machine-specific header). */
3460 HOST_WIDE_INT offset
;
3463 struct GTY((chain_next ("%h.next"))) constant_descriptor_rtx
{
3464 struct constant_descriptor_rtx
*next
;
3468 HOST_WIDE_INT offset
;
3470 enum machine_mode mode
;
3476 /* Hash and compare functions for const_rtx_htab. */
3479 const_desc_rtx_hash (const void *ptr
)
3481 const struct constant_descriptor_rtx
*const desc
3482 = (const struct constant_descriptor_rtx
*) ptr
;
3487 const_desc_rtx_eq (const void *a
, const void *b
)
3489 const struct constant_descriptor_rtx
*const x
3490 = (const struct constant_descriptor_rtx
*) a
;
3491 const struct constant_descriptor_rtx
*const y
3492 = (const struct constant_descriptor_rtx
*) b
;
3494 if (x
->mode
!= y
->mode
)
3496 return rtx_equal_p (x
->constant
, y
->constant
);
3499 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3502 const_rtx_hash_1 (rtx
*xp
, void *data
)
3504 unsigned HOST_WIDE_INT hwi
;
3505 enum machine_mode mode
;
3511 code
= GET_CODE (x
);
3512 mode
= GET_MODE (x
);
3513 h
= (hashval_t
) code
* 1048573 + mode
;
3521 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3522 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3525 h
^= (hashval_t
) hwi
;
3526 for (i
= 1; i
< n
; ++i
)
3529 h
^= (hashval_t
) hwi
;
3535 if (mode
== VOIDmode
)
3537 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3541 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3545 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3551 for (i
= XVECLEN (x
, 0); i
-- > 0; )
3552 h
= h
* 251 + const_rtx_hash_1 (&XVECEXP (x
, 0, i
), data
);
3557 h
^= htab_hash_string (XSTR (x
, 0));
3561 h
= h
* 251 + CODE_LABEL_NUMBER (XEXP (x
, 0));
3565 case UNSPEC_VOLATILE
:
3566 h
= h
* 251 + XINT (x
, 1);
3573 hp
= (hashval_t
*) data
;
3574 *hp
= *hp
* 509 + h
;
3578 /* Compute a hash value for X, which should be a constant. */
3581 const_rtx_hash (rtx x
)
3584 for_each_rtx (&x
, const_rtx_hash_1
, &h
);
3589 /* Create and return a new rtx constant pool. */
3591 static struct rtx_constant_pool
*
3592 create_constant_pool (void)
3594 struct rtx_constant_pool
*pool
;
3596 pool
= ggc_alloc_rtx_constant_pool ();
3597 pool
->const_rtx_htab
= htab_create_ggc (31, const_desc_rtx_hash
,
3598 const_desc_rtx_eq
, NULL
);
3605 /* Initialize constant pool hashing for a new function. */
3608 init_varasm_status (void)
3610 crtl
->varasm
.pool
= create_constant_pool ();
3611 crtl
->varasm
.deferred_constants
= 0;
3614 /* Given a MINUS expression, simplify it if both sides
3615 include the same symbol. */
3618 simplify_subtraction (rtx x
)
3620 rtx r
= simplify_rtx (x
);
3624 /* Given a constant rtx X, make (or find) a memory constant for its value
3625 and return a MEM rtx to refer to it in memory. */
3628 force_const_mem (enum machine_mode mode
, rtx x
)
3630 struct constant_descriptor_rtx
*desc
, tmp
;
3631 struct rtx_constant_pool
*pool
;
3638 /* If we're not allowed to drop X into the constant pool, don't. */
3639 if (targetm
.cannot_force_const_mem (mode
, x
))
3642 /* Record that this function has used a constant pool entry. */
3643 crtl
->uses_const_pool
= 1;
3645 /* Decide which pool to use. */
3646 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3647 ? shared_constant_pool
3648 : crtl
->varasm
.pool
);
3650 /* Lookup the value in the hashtable. */
3653 hash
= const_rtx_hash (x
);
3654 slot
= htab_find_slot_with_hash (pool
->const_rtx_htab
, &tmp
, hash
, INSERT
);
3655 desc
= (struct constant_descriptor_rtx
*) *slot
;
3657 /* If the constant was already present, return its memory. */
3659 return copy_rtx (desc
->mem
);
3661 /* Otherwise, create a new descriptor. */
3662 desc
= ggc_alloc_constant_descriptor_rtx ();
3665 /* Align the location counter as required by EXP's data type. */
3666 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3667 #ifdef CONSTANT_ALIGNMENT
3669 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3670 if (type
!= NULL_TREE
)
3671 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3675 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3676 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3679 desc
->constant
= copy_rtx (tmp
.constant
);
3680 desc
->offset
= pool
->offset
;
3683 desc
->align
= align
;
3684 desc
->labelno
= const_labelno
;
3687 pool
->offset
+= GET_MODE_SIZE (mode
);
3689 pool
->last
->next
= desc
;
3691 pool
->first
= pool
->last
= desc
;
3694 /* Create a string containing the label name, in LABEL. */
3695 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3698 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3699 the constants pool. */
3700 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3702 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3703 symbol
= create_block_symbol (ggc_strdup (label
),
3704 get_block_for_section (sect
), -1);
3707 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3709 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3710 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3711 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3713 /* Construct the MEM. */
3714 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3715 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3716 set_mem_align (def
, align
);
3718 /* If we're dropping a label to the constant pool, make sure we
3720 if (GET_CODE (x
) == LABEL_REF
)
3721 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3723 return copy_rtx (def
);
3726 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3729 get_pool_constant (rtx addr
)
3731 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3734 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3735 and whether it has been output or not. */
3738 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3740 struct constant_descriptor_rtx
*desc
;
3742 desc
= SYMBOL_REF_CONSTANT (addr
);
3743 *pmarked
= (desc
->mark
!= 0);
3744 return desc
->constant
;
3747 /* Similar, return the mode. */
3750 get_pool_mode (const_rtx addr
)
3752 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3755 /* Return the size of the constant pool. */
3758 get_pool_size (void)
3760 return crtl
->varasm
.pool
->offset
;
3763 /* Worker function for output_constant_pool_1. Emit assembly for X
3764 in MODE with known alignment ALIGN. */
3767 output_constant_pool_2 (enum machine_mode mode
, rtx x
, unsigned int align
)
3769 switch (GET_MODE_CLASS (mode
))
3772 case MODE_DECIMAL_FLOAT
:
3776 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3777 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3778 assemble_real (r
, mode
, align
);
3783 case MODE_PARTIAL_INT
:
3788 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3791 case MODE_VECTOR_FLOAT
:
3792 case MODE_VECTOR_INT
:
3793 case MODE_VECTOR_FRACT
:
3794 case MODE_VECTOR_UFRACT
:
3795 case MODE_VECTOR_ACCUM
:
3796 case MODE_VECTOR_UACCUM
:
3799 enum machine_mode submode
= GET_MODE_INNER (mode
);
3800 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3802 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3803 units
= CONST_VECTOR_NUNITS (x
);
3805 for (i
= 0; i
< units
; i
++)
3807 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3808 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3818 /* Worker function for output_constant_pool. Emit constant DESC,
3819 giving it ALIGN bits of alignment. */
3822 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3829 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3830 whose CODE_LABEL has been deleted. This can occur if a jump table
3831 is eliminated by optimization. If so, write a constant of zero
3832 instead. Note that this can also happen by turning the
3833 CODE_LABEL into a NOTE. */
3834 /* ??? This seems completely and utterly wrong. Certainly it's
3835 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3836 functioning even with INSN_DELETED_P and friends. */
3839 switch (GET_CODE (tmp
))
3842 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3843 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3845 tmp
= XEXP (XEXP (tmp
, 0), 0);
3849 tmp
= XEXP (tmp
, 0);
3850 gcc_assert (!INSN_DELETED_P (tmp
));
3851 gcc_assert (!NOTE_P (tmp
)
3852 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3859 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3860 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3861 align
, desc
->labelno
, done
);
3864 assemble_align (align
);
3866 /* Output the label. */
3867 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3869 /* Output the data. */
3870 output_constant_pool_2 (desc
->mode
, x
, align
);
3872 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3873 sections have proper size. */
3874 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3876 && (in_section
->common
.flags
& SECTION_MERGE
))
3877 assemble_align (align
);
3879 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3885 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3886 to as used. Emit referenced deferred strings. This function can
3887 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3890 mark_constant (rtx
*current_rtx
, void *data ATTRIBUTE_UNUSED
)
3892 rtx x
= *current_rtx
;
3894 if (x
== NULL_RTX
|| GET_CODE (x
) != SYMBOL_REF
)
3897 if (CONSTANT_POOL_ADDRESS_P (x
))
3899 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3900 if (desc
->mark
== 0)
3903 for_each_rtx (&desc
->constant
, mark_constant
, NULL
);
3906 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3908 tree decl
= SYMBOL_REF_DECL (x
);
3909 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
3911 n_deferred_constants
--;
3912 output_constant_def_contents (x
);
3919 /* Look through appropriate parts of INSN, marking all entries in the
3920 constant pool which are actually being used. Entries that are only
3921 referenced by other constants are also marked as used. Emit
3922 deferred strings that are used. */
3925 mark_constants (rtx insn
)
3930 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3931 insns, not any notes that may be attached. We don't want to mark
3932 a constant just because it happens to appear in a REG_EQUIV note. */
3933 if (GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3935 rtx seq
= PATTERN (insn
);
3936 int i
, n
= XVECLEN (seq
, 0);
3937 for (i
= 0; i
< n
; ++i
)
3939 rtx subinsn
= XVECEXP (seq
, 0, i
);
3940 if (INSN_P (subinsn
))
3941 for_each_rtx (&PATTERN (subinsn
), mark_constant
, NULL
);
3945 for_each_rtx (&PATTERN (insn
), mark_constant
, NULL
);
3948 /* Look through the instructions for this function, and mark all the
3949 entries in POOL which are actually being used. Emit deferred constants
3950 which have indeed been used. */
3953 mark_constant_pool (void)
3957 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
3960 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3961 mark_constants (insn
);
3964 /* Write all the constants in POOL. */
3967 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
3969 struct constant_descriptor_rtx
*desc
;
3971 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3974 /* If the constant is part of an object_block, make sure that
3975 the constant has been positioned within its block, but do not
3976 write out its definition yet. output_object_blocks will do
3978 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
3979 && SYMBOL_REF_BLOCK (desc
->sym
))
3980 place_block_symbol (desc
->sym
);
3983 switch_to_section (targetm
.asm_out
.select_rtx_section
3984 (desc
->mode
, desc
->constant
, desc
->align
));
3985 output_constant_pool_1 (desc
, desc
->align
);
3990 /* Mark all constants that are used in the current function, then write
3991 out the function's private constant pool. */
3994 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
3995 tree fndecl ATTRIBUTE_UNUSED
)
3997 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
3999 /* It is possible for gcc to call force_const_mem and then to later
4000 discard the instructions which refer to the constant. In such a
4001 case we do not need to output the constant. */
4002 mark_constant_pool ();
4004 #ifdef ASM_OUTPUT_POOL_PROLOGUE
4005 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4008 output_constant_pool_contents (pool
);
4010 #ifdef ASM_OUTPUT_POOL_EPILOGUE
4011 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4015 /* Write the contents of the shared constant pool. */
4018 output_shared_constant_pool (void)
4020 output_constant_pool_contents (shared_constant_pool
);
4023 /* Determine what kind of relocations EXP may need. */
4026 compute_reloc_for_constant (tree exp
)
4028 int reloc
= 0, reloc2
;
4031 switch (TREE_CODE (exp
))
4035 /* Go inside any operations that get_inner_reference can handle and see
4036 if what's inside is a constant: no need to do anything here for
4037 addresses of variables or functions. */
4038 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4039 tem
= TREE_OPERAND (tem
, 0))
4042 if (TREE_CODE (tem
) == MEM_REF
4043 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
4045 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
4049 if (TREE_PUBLIC (tem
))
4056 case POINTER_PLUS_EXPR
:
4057 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4058 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4062 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4063 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4064 /* The difference of two local labels is computable at link time. */
4065 if (reloc
== 1 && reloc2
== 1)
4072 case VIEW_CONVERT_EXPR
:
4073 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4078 unsigned HOST_WIDE_INT idx
;
4079 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4081 reloc
|= compute_reloc_for_constant (tem
);
4091 /* Find all the constants whose addresses are referenced inside of EXP,
4092 and make sure assembler code with a label has been output for each one.
4093 Indicate whether an ADDR_EXPR has been encountered. */
4096 output_addressed_constants (tree exp
)
4100 switch (TREE_CODE (exp
))
4104 /* Go inside any operations that get_inner_reference can handle and see
4105 if what's inside is a constant: no need to do anything here for
4106 addresses of variables or functions. */
4107 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4108 tem
= TREE_OPERAND (tem
, 0))
4111 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4112 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4113 tem
= DECL_INITIAL (tem
);
4115 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4116 output_constant_def (tem
, 0);
4118 if (TREE_CODE (tem
) == MEM_REF
)
4119 output_addressed_constants (TREE_OPERAND (tem
, 0));
4123 case POINTER_PLUS_EXPR
:
4125 output_addressed_constants (TREE_OPERAND (exp
, 1));
4129 case VIEW_CONVERT_EXPR
:
4130 output_addressed_constants (TREE_OPERAND (exp
, 0));
4135 unsigned HOST_WIDE_INT idx
;
4136 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4138 output_addressed_constants (tem
);
4147 /* Whether a constructor CTOR is a valid static constant initializer if all
4148 its elements are. This used to be internal to initializer_constant_valid_p
4149 and has been exposed to let other functions like categorize_ctor_elements
4150 evaluate the property while walking a constructor for other purposes. */
4153 constructor_static_from_elts_p (const_tree ctor
)
4155 return (TREE_CONSTANT (ctor
)
4156 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4157 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4158 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4161 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4164 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4165 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4166 which are valid when ENDTYPE is an integer of any size; in
4167 particular, this does not accept a pointer minus a constant. This
4168 returns null_pointer_node if the VALUE is an absolute constant
4169 which can be used to initialize a static variable. Otherwise it
4173 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4177 if (!INTEGRAL_TYPE_P (endtype
))
4180 op0
= TREE_OPERAND (value
, 0);
4181 op1
= TREE_OPERAND (value
, 1);
4183 /* Like STRIP_NOPS except allow the operand mode to widen. This
4184 works around a feature of fold that simplifies (int)(p1 - p2) to
4185 ((int)p1 - (int)p2) under the theory that the narrower operation
4188 while (CONVERT_EXPR_P (op0
)
4189 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4191 tree inner
= TREE_OPERAND (op0
, 0);
4192 if (inner
== error_mark_node
4193 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4194 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4195 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4200 while (CONVERT_EXPR_P (op1
)
4201 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4203 tree inner
= TREE_OPERAND (op1
, 0);
4204 if (inner
== error_mark_node
4205 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4206 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4207 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4212 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4216 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4217 cache
? cache
+ 2 : NULL
);
4218 /* Both initializers must be known. */
4222 && (op0
== null_pointer_node
4223 || TREE_CODE (value
) == MINUS_EXPR
))
4224 return null_pointer_node
;
4226 /* Support differences between labels. */
4227 if (TREE_CODE (op0
) == LABEL_DECL
4228 && TREE_CODE (op1
) == LABEL_DECL
)
4229 return null_pointer_node
;
4231 if (TREE_CODE (op0
) == STRING_CST
4232 && TREE_CODE (op1
) == STRING_CST
4233 && operand_equal_p (op0
, op1
, 1))
4234 return null_pointer_node
;
4240 /* Helper function of initializer_constant_valid_p.
4241 Return nonzero if VALUE is a valid constant-valued expression
4242 for use in initializing a static variable; one that can be an
4243 element of a "constant" initializer.
4245 Return null_pointer_node if the value is absolute;
4246 if it is relocatable, return the variable that determines the relocation.
4247 We assume that VALUE has been folded as much as possible;
4248 therefore, we do not need to check for such things as
4249 arithmetic-combinations of integers.
4251 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4254 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4258 switch (TREE_CODE (value
))
4261 if (constructor_static_from_elts_p (value
))
4263 unsigned HOST_WIDE_INT idx
;
4265 bool absolute
= true;
4267 if (cache
&& cache
[0] == value
)
4269 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4272 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4279 cache
[1] = NULL_TREE
;
4283 if (reloc
!= null_pointer_node
)
4286 /* For a non-absolute relocation, there is no single
4287 variable that can be "the variable that determines the
4292 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4294 return absolute
? null_pointer_node
: error_mark_node
;
4297 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4305 return null_pointer_node
;
4310 tree op0
= staticp (TREE_OPERAND (value
, 0));
4313 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4314 to be a constant, this is old-skool offsetof-like nonsense. */
4315 if (TREE_CODE (op0
) == INDIRECT_REF
4316 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4317 return null_pointer_node
;
4318 /* Taking the address of a nested function involves a trampoline,
4319 unless we don't need or want one. */
4320 if (TREE_CODE (op0
) == FUNCTION_DECL
4321 && DECL_STATIC_CHAIN (op0
)
4322 && !TREE_NO_TRAMPOLINE (value
))
4324 /* "&{...}" requires a temporary to hold the constructed
4326 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4332 case NON_LVALUE_EXPR
:
4333 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4336 case VIEW_CONVERT_EXPR
:
4338 tree src
= TREE_OPERAND (value
, 0);
4339 tree src_type
= TREE_TYPE (src
);
4340 tree dest_type
= TREE_TYPE (value
);
4342 /* Allow view-conversions from aggregate to non-aggregate type only
4343 if the bit pattern is fully preserved afterwards; otherwise, the
4344 RTL expander won't be able to apply a subsequent transformation
4345 to the underlying constructor. */
4346 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4348 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4349 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4354 /* Allow all other kinds of view-conversion. */
4355 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4360 tree src
= TREE_OPERAND (value
, 0);
4361 tree src_type
= TREE_TYPE (src
);
4362 tree dest_type
= TREE_TYPE (value
);
4364 /* Allow conversions between pointer types, floating-point
4365 types, and offset types. */
4366 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4367 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4368 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4369 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4370 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4372 /* Allow length-preserving conversions between integer types. */
4373 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4374 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4375 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4377 /* Allow conversions between other integer types only if
4379 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4381 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4382 if (inner
== null_pointer_node
)
4383 return null_pointer_node
;
4387 /* Allow (int) &foo provided int is as wide as a pointer. */
4388 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4389 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4390 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4392 /* Likewise conversions from int to pointers, but also allow
4393 conversions from 0. */
4394 if ((POINTER_TYPE_P (dest_type
)
4395 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4396 && INTEGRAL_TYPE_P (src_type
))
4398 if (TREE_CODE (src
) == INTEGER_CST
4399 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4400 return null_pointer_node
;
4401 if (integer_zerop (src
))
4402 return null_pointer_node
;
4403 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4404 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4407 /* Allow conversions to struct or union types if the value
4409 if (TREE_CODE (dest_type
) == RECORD_TYPE
4410 || TREE_CODE (dest_type
) == UNION_TYPE
)
4411 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4415 case POINTER_PLUS_EXPR
:
4417 /* Any valid floating-point constants will have been folded by now;
4418 with -frounding-math we hit this with addition of two constants. */
4419 if (TREE_CODE (endtype
) == REAL_TYPE
)
4421 if (cache
&& cache
[0] == value
)
4423 if (! INTEGRAL_TYPE_P (endtype
)
4424 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4426 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4428 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4431 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4432 endtype
, ncache
+ 2);
4433 /* If either term is absolute, use the other term's relocation. */
4434 if (valid0
== null_pointer_node
)
4436 else if (valid1
== null_pointer_node
)
4438 /* Support narrowing pointer differences. */
4440 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4444 /* Support narrowing pointer differences. */
4445 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4454 if (TREE_CODE (endtype
) == REAL_TYPE
)
4456 if (cache
&& cache
[0] == value
)
4458 if (! INTEGRAL_TYPE_P (endtype
)
4459 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4461 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4463 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4466 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4467 endtype
, ncache
+ 2);
4468 /* Win if second argument is absolute. */
4469 if (valid1
== null_pointer_node
)
4471 /* Win if both arguments have the same relocation.
4472 Then the value is absolute. */
4473 else if (valid0
== valid1
&& valid0
!= 0)
4474 ret
= null_pointer_node
;
4475 /* Since GCC guarantees that string constants are unique in the
4476 generated code, a subtraction between two copies of the same
4477 constant string is absolute. */
4478 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4479 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4480 && operand_equal_p (valid0
, valid1
, 1))
4481 ret
= null_pointer_node
;
4482 /* Support narrowing differences. */
4484 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4488 /* Support narrowing differences. */
4489 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4504 /* Return nonzero if VALUE is a valid constant-valued expression
4505 for use in initializing a static variable; one that can be an
4506 element of a "constant" initializer.
4508 Return null_pointer_node if the value is absolute;
4509 if it is relocatable, return the variable that determines the relocation.
4510 We assume that VALUE has been folded as much as possible;
4511 therefore, we do not need to check for such things as
4512 arithmetic-combinations of integers. */
4514 initializer_constant_valid_p (tree value
, tree endtype
)
4516 return initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4519 /* Return true if VALUE is a valid constant-valued expression
4520 for use in initializing a static bit-field; one that can be
4521 an element of a "constant" initializer. */
4524 initializer_constant_valid_for_bitfield_p (tree value
)
4526 /* For bitfields we support integer constants or possibly nested aggregates
4528 switch (TREE_CODE (value
))
4532 unsigned HOST_WIDE_INT idx
;
4535 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4536 if (!initializer_constant_valid_for_bitfield_p (elt
))
4545 case VIEW_CONVERT_EXPR
:
4546 case NON_LVALUE_EXPR
:
4548 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4557 /* output_constructor outer state of relevance in recursive calls, typically
4558 for nested aggregate bitfields. */
4561 unsigned int bit_offset
; /* current position in ... */
4562 int byte
; /* ... the outer byte buffer. */
4565 static unsigned HOST_WIDE_INT
4566 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int,
4569 /* Output assembler code for constant EXP, with no label.
4570 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4571 Assumes output_addressed_constants has been done on EXP already.
4573 Generate exactly SIZE bytes of assembler data, padding at the end
4574 with zeros if necessary. SIZE must always be specified.
4576 SIZE is important for structure constructors,
4577 since trailing members may have been omitted from the constructor.
4578 It is also important for initialization of arrays from string constants
4579 since the full length of the string constant might not be wanted.
4580 It is also needed for initialization of unions, where the initializer's
4581 type is just one member, and that may not be as long as the union.
4583 There a case in which we would fail to output exactly SIZE bytes:
4584 for a structure constructor that wants to produce more than SIZE bytes.
4585 But such constructors will never be generated for any possible input.
4587 ALIGN is the alignment of the data in bits. */
4590 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4592 enum tree_code code
;
4593 unsigned HOST_WIDE_INT thissize
;
4595 if (size
== 0 || flag_syntax_only
)
4598 /* See if we're trying to initialize a pointer in a non-default mode
4599 to the address of some declaration somewhere. If the target says
4600 the mode is valid for pointers, assume the target has a way of
4602 if (TREE_CODE (exp
) == NOP_EXPR
4603 && POINTER_TYPE_P (TREE_TYPE (exp
))
4604 && targetm
.addr_space
.valid_pointer_mode
4605 (TYPE_MODE (TREE_TYPE (exp
)),
4606 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4608 tree saved_type
= TREE_TYPE (exp
);
4610 /* Peel off any intermediate conversions-to-pointer for valid
4612 while (TREE_CODE (exp
) == NOP_EXPR
4613 && POINTER_TYPE_P (TREE_TYPE (exp
))
4614 && targetm
.addr_space
.valid_pointer_mode
4615 (TYPE_MODE (TREE_TYPE (exp
)),
4616 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4617 exp
= TREE_OPERAND (exp
, 0);
4619 /* If what we're left with is the address of something, we can
4620 convert the address to the final type and output it that
4622 if (TREE_CODE (exp
) == ADDR_EXPR
)
4623 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4624 /* Likewise for constant ints. */
4625 else if (TREE_CODE (exp
) == INTEGER_CST
)
4626 exp
= build_int_cst_wide (saved_type
, TREE_INT_CST_LOW (exp
),
4627 TREE_INT_CST_HIGH (exp
));
4631 /* Eliminate any conversions since we'll be outputting the underlying
4633 while (CONVERT_EXPR_P (exp
)
4634 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4635 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4637 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4638 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4640 /* Make sure eliminating the conversion is really a no-op, except with
4641 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4642 union types to allow for Ada unchecked unions. */
4643 if (type_size
> op_size
4644 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4645 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4646 /* Keep the conversion. */
4649 exp
= TREE_OPERAND (exp
, 0);
4652 code
= TREE_CODE (TREE_TYPE (exp
));
4653 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4655 /* Allow a constructor with no elements for any data type.
4656 This means to fill the space with zeros. */
4657 if (TREE_CODE (exp
) == CONSTRUCTOR
4658 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4660 assemble_zeros (size
);
4664 if (TREE_CODE (exp
) == FDESC_EXPR
)
4666 #ifdef ASM_OUTPUT_FDESC
4667 HOST_WIDE_INT part
= tree_to_shwi (TREE_OPERAND (exp
, 1));
4668 tree decl
= TREE_OPERAND (exp
, 0);
4669 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4676 /* Now output the underlying data. If we've handling the padding, return.
4677 Otherwise, break and ensure SIZE is the size written. */
4684 case REFERENCE_TYPE
:
4686 case FIXED_POINT_TYPE
:
4687 case POINTER_BOUNDS_TYPE
:
4689 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4690 EXPAND_INITIALIZER
),
4691 MIN (size
, thissize
), align
, 0))
4692 error ("initializer for integer/fixed-point value is too complicated");
4696 if (TREE_CODE (exp
) != REAL_CST
)
4697 error ("initializer for floating value is not a floating constant");
4699 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4703 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4704 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4705 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4710 switch (TREE_CODE (exp
))
4713 output_constructor (exp
, size
, align
, NULL
);
4717 = MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
), size
);
4718 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4722 enum machine_mode inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4723 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4724 int elt_size
= GET_MODE_SIZE (inner
);
4725 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
);
4726 thissize
= elt_size
;
4727 for (unsigned int i
= 1; i
< VECTOR_CST_NELTS (exp
); i
++)
4729 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
);
4730 thissize
+= elt_size
;
4741 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4742 output_constructor (exp
, size
, align
, NULL
);
4752 if (size
> thissize
)
4753 assemble_zeros (size
- thissize
);
4757 /* Subroutine of output_constructor, used for computing the size of
4758 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4759 type with an unspecified upper bound. */
4761 static unsigned HOST_WIDE_INT
4762 array_size_for_constructor (tree val
)
4765 unsigned HOST_WIDE_INT cnt
;
4766 tree index
, value
, tmp
;
4769 /* This code used to attempt to handle string constants that are not
4770 arrays of single-bytes, but nothing else does, so there's no point in
4772 if (TREE_CODE (val
) == STRING_CST
)
4773 return TREE_STRING_LENGTH (val
);
4775 max_index
= NULL_TREE
;
4776 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4778 if (TREE_CODE (index
) == RANGE_EXPR
)
4779 index
= TREE_OPERAND (index
, 1);
4780 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4784 if (max_index
== NULL_TREE
)
4787 /* Compute the total number of array elements. */
4788 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4789 i
= tree_to_double_int (max_index
) - tree_to_double_int (tmp
);
4790 i
+= double_int_one
;
4792 /* Multiply by the array element unit size to find number of bytes. */
4793 i
*= tree_to_double_int (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4795 gcc_assert (i
.fits_uhwi ());
4799 /* Other datastructures + helpers for output_constructor. */
4801 /* output_constructor local state to support interaction with helpers. */
4805 /* Received arguments. */
4806 tree exp
; /* Constructor expression. */
4807 tree type
; /* Type of constructor expression. */
4808 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4809 unsigned int align
; /* Known initial alignment. */
4810 tree min_index
; /* Lower bound if specified for an array. */
4812 /* Output processing state. */
4813 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4814 int byte
; /* Part of a bitfield byte yet to be output. */
4815 int last_relative_index
; /* Implicit or explicit index of the last
4816 array element output within a bitfield. */
4817 bool byte_buffer_in_use
; /* Whether BYTE is in use. */
4819 /* Current element. */
4820 tree field
; /* Current field decl in a record. */
4821 tree val
; /* Current element value. */
4822 tree index
; /* Current element index. */
4826 /* Helper for output_constructor. From the current LOCAL state, output a
4827 RANGE_EXPR element. */
4830 output_constructor_array_range (oc_local_state
*local
)
4832 unsigned HOST_WIDE_INT fieldsize
4833 = int_size_in_bytes (TREE_TYPE (local
->type
));
4835 HOST_WIDE_INT lo_index
4836 = tree_to_shwi (TREE_OPERAND (local
->index
, 0));
4837 HOST_WIDE_INT hi_index
4838 = tree_to_shwi (TREE_OPERAND (local
->index
, 1));
4839 HOST_WIDE_INT index
;
4842 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4844 for (index
= lo_index
; index
<= hi_index
; index
++)
4846 /* Output the element's initial value. */
4847 if (local
->val
== NULL_TREE
)
4848 assemble_zeros (fieldsize
);
4850 output_constant (local
->val
, fieldsize
, align2
);
4852 /* Count its size. */
4853 local
->total_bytes
+= fieldsize
;
4857 /* Helper for output_constructor. From the current LOCAL state, output a
4858 field element that is not true bitfield or part of an outer one. */
4861 output_constructor_regular_field (oc_local_state
*local
)
4863 /* Field size and position. Since this structure is static, we know the
4864 positions are constant. */
4865 unsigned HOST_WIDE_INT fieldsize
;
4866 HOST_WIDE_INT fieldpos
;
4868 unsigned int align2
;
4870 if (local
->index
!= NULL_TREE
)
4872 /* Perform the index calculation in modulo arithmetic but
4873 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4874 but we are using an unsigned sizetype. */
4875 unsigned prec
= TYPE_PRECISION (sizetype
);
4876 double_int idx
= tree_to_double_int (local
->index
)
4877 - tree_to_double_int (local
->min_index
);
4878 idx
= idx
.sext (prec
);
4879 fieldpos
= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
)), 1)
4882 else if (local
->field
!= NULL_TREE
)
4883 fieldpos
= int_byte_position (local
->field
);
4887 /* Output any buffered-up bit-fields preceding this element. */
4888 if (local
->byte_buffer_in_use
)
4890 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4891 local
->total_bytes
++;
4892 local
->byte_buffer_in_use
= false;
4895 /* Advance to offset of this element.
4896 Note no alignment needed in an array, since that is guaranteed
4897 if each element has the proper size. */
4898 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4899 && fieldpos
!= local
->total_bytes
)
4901 gcc_assert (fieldpos
>= local
->total_bytes
);
4902 assemble_zeros (fieldpos
- local
->total_bytes
);
4903 local
->total_bytes
= fieldpos
;
4906 /* Find the alignment of this element. */
4907 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
4909 /* Determine size this element should occupy. */
4914 /* If this is an array with an unspecified upper bound,
4915 the initializer determines the size. */
4916 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4917 but we cannot do this until the deprecated support for
4918 initializing zero-length array members is removed. */
4919 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
4920 && TYPE_DOMAIN (TREE_TYPE (local
->field
))
4921 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
))))
4923 fieldsize
= array_size_for_constructor (local
->val
);
4924 /* Given a non-empty initialization, this field had
4926 gcc_assert (!fieldsize
|| !DECL_CHAIN (local
->field
));
4929 fieldsize
= tree_low_cst (DECL_SIZE_UNIT (local
->field
), 1);
4932 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
4934 /* Output the element's initial value. */
4935 if (local
->val
== NULL_TREE
)
4936 assemble_zeros (fieldsize
);
4938 output_constant (local
->val
, fieldsize
, align2
);
4940 /* Count its size. */
4941 local
->total_bytes
+= fieldsize
;
4944 /* Helper for output_constructor. From the LOCAL state, output an element
4945 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
4946 from the start of a possibly ongoing outer byte buffer. */
4949 output_constructor_bitfield (oc_local_state
*local
, unsigned int bit_offset
)
4951 /* Bit size of this element. */
4952 HOST_WIDE_INT ebitsize
4954 ? tree_low_cst (DECL_SIZE (local
->field
), 1)
4955 : tree_low_cst (TYPE_SIZE (TREE_TYPE (local
->type
)), 1));
4957 /* Relative index of this element if this is an array component. */
4958 HOST_WIDE_INT relative_index
4961 ? (tree_to_shwi (local
->index
)
4962 - tree_to_shwi (local
->min_index
))
4963 : local
->last_relative_index
+ 1)
4966 /* Bit position of this element from the start of the containing
4968 HOST_WIDE_INT constructor_relative_ebitpos
4970 ? int_bit_position (local
->field
)
4971 : ebitsize
* relative_index
);
4973 /* Bit position of this element from the start of a possibly ongoing
4974 outer byte buffer. */
4975 HOST_WIDE_INT byte_relative_ebitpos
4976 = bit_offset
+ constructor_relative_ebitpos
;
4978 /* From the start of a possibly ongoing outer byte buffer, offsets to
4979 the first bit of this element and to the first bit past the end of
4981 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
4982 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
4984 local
->last_relative_index
= relative_index
;
4986 if (local
->val
== NULL_TREE
)
4987 local
->val
= integer_zero_node
;
4989 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
4990 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
4991 local
->val
= TREE_OPERAND (local
->val
, 0);
4993 if (TREE_CODE (local
->val
) != INTEGER_CST
4994 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
4996 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
5000 /* If this field does not start in this (or next) byte, skip some bytes. */
5001 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5003 /* Output remnant of any bit field in previous bytes. */
5004 if (local
->byte_buffer_in_use
)
5006 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5007 local
->total_bytes
++;
5008 local
->byte_buffer_in_use
= false;
5011 /* If still not at proper byte, advance to there. */
5012 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5014 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
5015 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
5016 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
5020 /* Set up the buffer if necessary. */
5021 if (!local
->byte_buffer_in_use
)
5025 local
->byte_buffer_in_use
= true;
5028 /* If this is nested constructor, recurse passing the bit offset and the
5029 pending data, then retrieve the new pending data afterwards. */
5030 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
5032 oc_outer_state temp_state
;
5033 temp_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
5034 temp_state
.byte
= local
->byte
;
5036 += output_constructor (local
->val
, 0, 0, &temp_state
);
5037 local
->byte
= temp_state
.byte
;
5041 /* Otherwise, we must split the element into pieces that fall within
5042 separate bytes, and combine each byte with previous or following
5044 while (next_offset
< end_offset
)
5048 HOST_WIDE_INT value
;
5049 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
5050 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
5052 /* Advance from byte to byte within this element when necessary. */
5053 while (next_byte
!= local
->total_bytes
)
5055 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5056 local
->total_bytes
++;
5060 /* Number of bits we can process at once (all part of the same byte). */
5061 this_time
= MIN (end_offset
- next_offset
, BITS_PER_UNIT
- next_bit
);
5062 if (BYTES_BIG_ENDIAN
)
5064 /* On big-endian machine, take the most significant bits
5065 first (of the bits that are significant)
5066 and put them into bytes from the most significant end. */
5067 shift
= end_offset
- next_offset
- this_time
;
5069 /* Don't try to take a bunch of bits that cross
5070 the word boundary in the INTEGER_CST. We can
5071 only select bits from the LOW or HIGH part
5073 if (shift
< HOST_BITS_PER_WIDE_INT
5074 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
5076 this_time
= shift
+ this_time
- HOST_BITS_PER_WIDE_INT
;
5077 shift
= HOST_BITS_PER_WIDE_INT
;
5080 /* Now get the bits from the appropriate constant word. */
5081 if (shift
< HOST_BITS_PER_WIDE_INT
)
5082 value
= TREE_INT_CST_LOW (local
->val
);
5085 gcc_assert (shift
< HOST_BITS_PER_DOUBLE_INT
);
5086 value
= TREE_INT_CST_HIGH (local
->val
);
5087 shift
-= HOST_BITS_PER_WIDE_INT
;
5090 /* Get the result. This works only when:
5091 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5092 local
->byte
|= (((value
>> shift
)
5093 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5094 << (BITS_PER_UNIT
- this_time
- next_bit
));
5098 /* On little-endian machines,
5099 take first the least significant bits of the value
5100 and pack them starting at the least significant
5101 bits of the bytes. */
5102 shift
= next_offset
- byte_relative_ebitpos
;
5104 /* Don't try to take a bunch of bits that cross
5105 the word boundary in the INTEGER_CST. We can
5106 only select bits from the LOW or HIGH part
5108 if (shift
< HOST_BITS_PER_WIDE_INT
5109 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
5110 this_time
= (HOST_BITS_PER_WIDE_INT
- shift
);
5112 /* Now get the bits from the appropriate constant word. */
5113 if (shift
< HOST_BITS_PER_WIDE_INT
)
5114 value
= TREE_INT_CST_LOW (local
->val
);
5117 gcc_assert (shift
< HOST_BITS_PER_DOUBLE_INT
);
5118 value
= TREE_INT_CST_HIGH (local
->val
);
5119 shift
-= HOST_BITS_PER_WIDE_INT
;
5122 /* Get the result. This works only when:
5123 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5124 local
->byte
|= (((value
>> shift
)
5125 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5129 next_offset
+= this_time
;
5130 local
->byte_buffer_in_use
= true;
5134 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5135 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5136 caller output state of relevance in recursive invocations. */
5138 static unsigned HOST_WIDE_INT
5139 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
5140 unsigned int align
, oc_outer_state
*outer
)
5142 unsigned HOST_WIDE_INT cnt
;
5143 constructor_elt
*ce
;
5145 oc_local_state local
;
5147 /* Setup our local state to communicate with helpers. */
5149 local
.type
= TREE_TYPE (exp
);
5151 local
.align
= align
;
5152 if (TREE_CODE (local
.type
) == ARRAY_TYPE
&& TYPE_DOMAIN (local
.type
))
5153 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5155 local
.min_index
= NULL_TREE
;
5157 local
.total_bytes
= 0;
5158 local
.byte_buffer_in_use
= outer
!= NULL
;
5159 local
.byte
= outer
? outer
->byte
: 0;
5160 local
.last_relative_index
= -1;
5162 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5164 /* As CE goes through the elements of the constant, FIELD goes through the
5165 structure fields if the constant is a structure. If the constant is a
5166 union, we override this by getting the field from the TREE_LIST element.
5167 But the constant could also be an array. Then FIELD is zero.
5169 There is always a maximum of one element in the chain LINK for unions
5170 (even if the initializer in a source program incorrectly contains
5173 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5174 local
.field
= TYPE_FIELDS (local
.type
);
5176 local
.field
= NULL_TREE
;
5179 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5180 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5182 local
.val
= ce
->value
;
5183 local
.index
= NULL_TREE
;
5185 /* The element in a union constructor specifies the proper field
5187 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5188 local
.field
= ce
->index
;
5190 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5191 local
.index
= ce
->index
;
5193 if (local
.field
&& flag_verbose_asm
)
5194 fprintf (asm_out_file
, "%s %s:\n",
5196 DECL_NAME (local
.field
)
5197 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5200 /* Eliminate the marker that makes a cast not be an lvalue. */
5201 if (local
.val
!= NULL_TREE
)
5202 STRIP_NOPS (local
.val
);
5204 /* Output the current element, using the appropriate helper ... */
5206 /* For an array slice not part of an outer bitfield. */
5208 && local
.index
!= NULL_TREE
5209 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5210 output_constructor_array_range (&local
);
5212 /* For a field that is neither a true bitfield nor part of an outer one,
5213 known to be at least byte aligned and multiple-of-bytes long. */
5215 && (local
.field
== NULL_TREE
5216 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5217 output_constructor_regular_field (&local
);
5219 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5220 supported for scalar fields, so we may need to convert first. */
5223 if (TREE_CODE (local
.val
) == REAL_CST
)
5225 = fold_unary (VIEW_CONVERT_EXPR
,
5226 build_nonstandard_integer_type
5227 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5229 output_constructor_bitfield (&local
, outer
? outer
->bit_offset
: 0);
5233 /* If we are not at toplevel, save the pending data for our caller.
5234 Otherwise output the pending data and padding zeros as needed. */
5236 outer
->byte
= local
.byte
;
5239 if (local
.byte_buffer_in_use
)
5241 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5242 local
.total_bytes
++;
5245 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5247 assemble_zeros (local
.size
- local
.total_bytes
);
5248 local
.total_bytes
= local
.size
;
5252 return local
.total_bytes
;
5255 /* Mark DECL as weak. */
5258 mark_weak (tree decl
)
5260 DECL_WEAK (decl
) = 1;
5262 if (DECL_RTL_SET_P (decl
)
5263 && MEM_P (DECL_RTL (decl
))
5264 && XEXP (DECL_RTL (decl
), 0)
5265 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5266 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5269 /* Merge weak status between NEWDECL and OLDDECL. */
5272 merge_weak (tree newdecl
, tree olddecl
)
5274 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5276 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5279 /* We put the NEWDECL on the weak_decls list at some point
5280 and OLDDECL as well. Keep just OLDDECL on the list. */
5281 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5282 if (TREE_VALUE (*pwd
) == newdecl
)
5284 *pwd
= TREE_CHAIN (*pwd
);
5291 if (DECL_WEAK (newdecl
))
5295 /* NEWDECL is weak, but OLDDECL is not. */
5297 /* If we already output the OLDDECL, we're in trouble; we can't
5298 go back and make it weak. This should never happen in
5299 unit-at-a-time compilation. */
5300 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5302 /* If we've already generated rtl referencing OLDDECL, we may
5303 have done so in a way that will not function properly with
5304 a weak symbol. Again in unit-at-a-time this should be
5306 gcc_assert (!TREE_USED (olddecl
)
5307 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5309 if (TARGET_SUPPORTS_WEAK
)
5311 /* We put the NEWDECL on the weak_decls list at some point.
5312 Replace it with the OLDDECL. */
5313 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5314 if (TREE_VALUE (wd
) == newdecl
)
5316 TREE_VALUE (wd
) = olddecl
;
5319 /* We may not find the entry on the list. If NEWDECL is a
5320 weak alias, then we will have already called
5321 globalize_decl to remove the entry; in that case, we do
5322 not need to do anything. */
5325 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5326 mark_weak (olddecl
);
5329 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5330 weak. Just update NEWDECL to indicate that it's weak too. */
5331 mark_weak (newdecl
);
5334 /* Declare DECL to be a weak symbol. */
5337 declare_weak (tree decl
)
5339 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5340 if (! TREE_PUBLIC (decl
))
5341 error ("weak declaration of %q+D must be public", decl
);
5342 else if (!TARGET_SUPPORTS_WEAK
)
5343 warning (0, "weak declaration of %q+D not supported", decl
);
5346 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5347 DECL_ATTRIBUTES (decl
)
5348 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5352 weak_finish_1 (tree decl
)
5354 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5355 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5358 if (! TREE_USED (decl
))
5361 #ifdef ASM_WEAKEN_DECL
5362 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5364 #ifdef ASM_WEAKEN_LABEL
5365 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5367 #ifdef ASM_OUTPUT_WEAK_ALIAS
5369 static bool warn_once
= 0;
5372 warning (0, "only weak aliases are supported in this configuration");
5382 /* Fiven an assembly name, find the decl it is associated with. */
5384 find_decl (tree target
)
5386 symtab_node
*node
= symtab_node_for_asm (target
);
5392 /* This TREE_LIST contains weakref targets. */
5394 static GTY(()) tree weakref_targets
;
5396 /* Emit any pending weak declarations. */
5403 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5405 tree alias_decl
= TREE_PURPOSE (t
);
5406 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5408 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5409 /* Remove alias_decl from the weak list, but leave entries for
5410 the target alone. */
5412 #ifndef ASM_OUTPUT_WEAKREF
5413 else if (! TREE_SYMBOL_REFERENCED (target
))
5415 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5416 defined, otherwise we and weak_finish_1 would use
5417 different macros. */
5418 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5419 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5421 tree decl
= find_decl (target
);
5425 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5426 TREE_CODE (alias_decl
), target
,
5427 TREE_TYPE (alias_decl
));
5429 DECL_EXTERNAL (decl
) = 1;
5430 TREE_PUBLIC (decl
) = 1;
5431 DECL_ARTIFICIAL (decl
) = 1;
5432 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5433 TREE_USED (decl
) = 1;
5436 weak_finish_1 (decl
);
5445 /* Remove the alias and the target from the pending weak list
5446 so that we do not emit any .weak directives for the former,
5447 nor multiple .weak directives for the latter. */
5448 for (p
= &weak_decls
; (t2
= *p
) ; )
5450 if (TREE_VALUE (t2
) == alias_decl
5451 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5452 *p
= TREE_CHAIN (t2
);
5454 p
= &TREE_CHAIN (t2
);
5457 /* Remove other weakrefs to the same target, to speed things up. */
5458 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5460 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5461 *p
= TREE_CHAIN (t2
);
5463 p
= &TREE_CHAIN (t2
);
5468 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5470 tree decl
= TREE_VALUE (t
);
5472 weak_finish_1 (decl
);
5476 /* Emit the assembly bits to indicate that DECL is globally visible. */
5479 globalize_decl (tree decl
)
5482 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5483 if (DECL_WEAK (decl
))
5485 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5488 #ifdef ASM_WEAKEN_DECL
5489 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5491 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5494 /* Remove this function from the pending weak list so that
5495 we do not emit multiple .weak directives for it. */
5496 for (p
= &weak_decls
; (t
= *p
) ; )
5498 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5499 *p
= TREE_CHAIN (t
);
5501 p
= &TREE_CHAIN (t
);
5504 /* Remove weakrefs to the same target from the pending weakref
5505 list, for the same reason. */
5506 for (p
= &weakref_targets
; (t
= *p
) ; )
5508 if (DECL_ASSEMBLER_NAME (decl
)
5509 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5510 *p
= TREE_CHAIN (t
);
5512 p
= &TREE_CHAIN (t
);
5519 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5522 vec
<alias_pair
, va_gc
> *alias_pairs
;
5524 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5525 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5526 tree node is DECL to have the value of the tree node TARGET. */
5529 do_assemble_alias (tree decl
, tree target
)
5531 /* Emulated TLS had better not get this var. */
5532 gcc_assert (!(!targetm
.have_tls
5533 && TREE_CODE (decl
) == VAR_DECL
5534 && DECL_THREAD_LOCAL_P (decl
)));
5536 if (TREE_ASM_WRITTEN (decl
))
5539 /* We must force creation of DECL_RTL for debug info generation, even though
5540 we don't use it here. */
5541 make_decl_rtl (decl
);
5543 TREE_ASM_WRITTEN (decl
) = 1;
5544 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5546 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5548 ultimate_transparent_alias_target (&target
);
5550 if (!TREE_SYMBOL_REFERENCED (target
))
5551 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5553 #ifdef ASM_OUTPUT_WEAKREF
5554 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5555 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5556 IDENTIFIER_POINTER (target
));
5558 if (!TARGET_SUPPORTS_WEAK
)
5560 error_at (DECL_SOURCE_LOCATION (decl
),
5561 "weakref is not supported in this configuration");
5568 #ifdef ASM_OUTPUT_DEF
5569 /* Make name accessible from other files, if appropriate. */
5571 if (TREE_PUBLIC (decl
))
5573 globalize_decl (decl
);
5574 maybe_assemble_visibility (decl
);
5576 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5578 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5579 if (targetm
.has_ifunc_p ())
5580 ASM_OUTPUT_TYPE_DIRECTIVE
5581 (asm_out_file
, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5585 error_at (DECL_SOURCE_LOCATION (decl
),
5586 "ifunc is not supported on this target");
5589 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5590 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5592 ASM_OUTPUT_DEF (asm_out_file
,
5593 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5594 IDENTIFIER_POINTER (target
));
5596 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5601 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5602 # ifdef ASM_WEAKEN_DECL
5603 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5605 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5607 /* Remove this function from the pending weak list so that
5608 we do not emit multiple .weak directives for it. */
5609 for (p
= &weak_decls
; (t
= *p
) ; )
5610 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5611 *p
= TREE_CHAIN (t
);
5613 p
= &TREE_CHAIN (t
);
5615 /* Remove weakrefs to the same target from the pending weakref
5616 list, for the same reason. */
5617 for (p
= &weakref_targets
; (t
= *p
) ; )
5619 if (DECL_ASSEMBLER_NAME (decl
)
5620 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5621 *p
= TREE_CHAIN (t
);
5623 p
= &TREE_CHAIN (t
);
5629 /* Emit an assembler directive to make the symbol for DECL an alias to
5630 the symbol for TARGET. */
5633 assemble_alias (tree decl
, tree target
)
5637 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5639 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5641 ultimate_transparent_alias_target (&target
);
5643 if (alias
== target
)
5644 error ("weakref %q+D ultimately targets itself", decl
);
5645 if (TREE_PUBLIC (decl
))
5646 error ("weakref %q+D must have static linkage", decl
);
5650 #if !defined (ASM_OUTPUT_DEF)
5651 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5652 error_at (DECL_SOURCE_LOCATION (decl
),
5653 "alias definitions not supported in this configuration");
5656 if (!DECL_WEAK (decl
))
5658 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5659 error_at (DECL_SOURCE_LOCATION (decl
),
5660 "ifunc is not supported in this configuration");
5662 error_at (DECL_SOURCE_LOCATION (decl
),
5663 "only weak aliases are supported in this configuration");
5669 TREE_USED (decl
) = 1;
5671 /* Allow aliases to aliases. */
5672 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5673 cgraph_get_create_node (decl
)->alias
= true;
5675 varpool_node_for_decl (decl
)->alias
= true;
5677 /* If the target has already been emitted, we don't have to queue the
5678 alias. This saves a tad of memory. */
5679 if (cgraph_global_info_ready
)
5680 target_decl
= find_decl (target
);
5683 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5684 || cgraph_state
>= CGRAPH_STATE_EXPANSION
)
5685 do_assemble_alias (decl
, target
);
5688 alias_pair p
= {decl
, target
};
5689 vec_safe_push (alias_pairs
, p
);
5693 /* Record and output a table of translations from original function
5694 to its transaction aware clone. Note that tm_pure functions are
5695 considered to be their own clone. */
5697 static GTY((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
5698 htab_t tm_clone_hash
;
5701 record_tm_clone_pair (tree o
, tree n
)
5703 struct tree_map
**slot
, *h
;
5705 if (tm_clone_hash
== NULL
)
5706 tm_clone_hash
= htab_create_ggc (32, tree_map_hash
, tree_map_eq
, 0);
5708 h
= ggc_alloc_tree_map ();
5709 h
->hash
= htab_hash_pointer (o
);
5713 slot
= (struct tree_map
**)
5714 htab_find_slot_with_hash (tm_clone_hash
, h
, h
->hash
, INSERT
);
5719 get_tm_clone_pair (tree o
)
5723 struct tree_map
*h
, in
;
5726 in
.hash
= htab_hash_pointer (o
);
5727 h
= (struct tree_map
*) htab_find_with_hash (tm_clone_hash
,
5735 typedef struct tm_alias_pair
5743 /* Helper function for finish_tm_clone_pairs. Dump a hash table entry
5744 into a VEC in INFO. */
5747 dump_tm_clone_to_vec (void **slot
, void *info
)
5749 struct tree_map
*map
= (struct tree_map
*) *slot
;
5750 vec
<tm_alias_pair
> *tm_alias_pairs
= (vec
<tm_alias_pair
> *) info
;
5751 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5752 tm_alias_pairs
->safe_push (p
);
5756 /* Dump the actual pairs to the .tm_clone_table section. */
5759 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5763 bool switched
= false;
5765 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5769 struct cgraph_node
*src_n
= cgraph_get_node (src
);
5770 struct cgraph_node
*dst_n
= cgraph_get_node (dst
);
5772 /* The function ipa_tm_create_version() marks the clone as needed if
5773 the original function was needed. But we also mark the clone as
5774 needed if we ever called the clone indirectly through
5775 TM_GETTMCLONE. If neither of these are true, we didn't generate
5776 a clone, and we didn't call it indirectly... no sense keeping it
5777 in the clone table. */
5778 if (!dst_n
|| !dst_n
->definition
)
5781 /* This covers the case where we have optimized the original
5782 function away, and only access the transactional clone. */
5783 if (!src_n
|| !src_n
->definition
)
5788 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5789 assemble_align (POINTER_SIZE
);
5793 assemble_integer (XEXP (DECL_RTL (src
), 0),
5794 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5795 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5796 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5800 /* Provide a default for the tm_clone_table section. */
5803 default_clone_table_section (void)
5805 return get_named_section (NULL
, ".tm_clone_table", 3);
5808 /* Helper comparison function for qsorting by the DECL_UID stored in
5809 alias_pair->emitted_diags. */
5812 tm_alias_pair_cmp (const void *x
, const void *y
)
5814 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5815 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5816 if (p1
->uid
< p2
->uid
)
5818 if (p1
->uid
> p2
->uid
)
5824 finish_tm_clone_pairs (void)
5826 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5828 if (tm_clone_hash
== NULL
)
5831 /* We need a determenistic order for the .tm_clone_table, otherwise
5832 we will get bootstrap comparison failures, so dump the hash table
5833 to a vector, sort it, and dump the vector. */
5835 /* Dump the hashtable to a vector. */
5836 htab_traverse_noresize (tm_clone_hash
, dump_tm_clone_to_vec
,
5837 (void *) &tm_alias_pairs
);
5839 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5842 dump_tm_clone_pairs (tm_alias_pairs
);
5844 htab_delete (tm_clone_hash
);
5845 tm_clone_hash
= NULL
;
5846 tm_alias_pairs
.release ();
5850 /* Emit an assembler directive to set symbol for DECL visibility to
5851 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5854 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5855 int vis ATTRIBUTE_UNUSED
)
5857 #ifdef HAVE_GAS_HIDDEN
5858 static const char * const visibility_types
[] = {
5859 NULL
, "protected", "hidden", "internal"
5862 const char *name
, *type
;
5864 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5865 type
= visibility_types
[vis
];
5867 fprintf (asm_out_file
, "\t.%s\t", type
);
5868 assemble_name (asm_out_file
, name
);
5869 fprintf (asm_out_file
, "\n");
5871 if (!DECL_ARTIFICIAL (decl
))
5872 warning (OPT_Wattributes
, "visibility attribute not supported "
5873 "in this configuration; ignored");
5877 /* A helper function to call assemble_visibility when needed for a decl. */
5880 maybe_assemble_visibility (tree decl
)
5882 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5884 if (vis
!= VISIBILITY_DEFAULT
)
5886 targetm
.asm_out
.assemble_visibility (decl
, vis
);
5893 /* Returns 1 if the target configuration supports defining public symbols
5894 so that one of them will be chosen at link time instead of generating a
5895 multiply-defined symbol error, whether through the use of weak symbols or
5896 a target-specific mechanism for having duplicates discarded. */
5899 supports_one_only (void)
5901 if (SUPPORTS_ONE_ONLY
)
5903 return TARGET_SUPPORTS_WEAK
;
5906 /* Set up DECL as a public symbol that can be defined in multiple
5907 translation units without generating a linker error. */
5910 make_decl_one_only (tree decl
, tree comdat_group
)
5912 gcc_assert (TREE_CODE (decl
) == VAR_DECL
5913 || TREE_CODE (decl
) == FUNCTION_DECL
);
5915 TREE_PUBLIC (decl
) = 1;
5917 if (SUPPORTS_ONE_ONLY
)
5919 #ifdef MAKE_DECL_ONE_ONLY
5920 MAKE_DECL_ONE_ONLY (decl
);
5922 DECL_COMDAT_GROUP (decl
) = comdat_group
;
5924 else if (TREE_CODE (decl
) == VAR_DECL
5925 && (DECL_INITIAL (decl
) == 0 || DECL_INITIAL (decl
) == error_mark_node
))
5926 DECL_COMMON (decl
) = 1;
5929 gcc_assert (TARGET_SUPPORTS_WEAK
);
5930 DECL_WEAK (decl
) = 1;
5935 init_varasm_once (void)
5937 section_htab
= htab_create_ggc (31, section_entry_hash
,
5938 section_entry_eq
, NULL
);
5939 object_block_htab
= htab_create_ggc (31, object_block_entry_hash
,
5940 object_block_entry_eq
, NULL
);
5941 const_desc_htab
= htab_create_ggc (1009, const_desc_hash
,
5942 const_desc_eq
, NULL
);
5944 const_alias_set
= new_alias_set ();
5945 shared_constant_pool
= create_constant_pool ();
5947 #ifdef TEXT_SECTION_ASM_OP
5948 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
5949 TEXT_SECTION_ASM_OP
);
5952 #ifdef DATA_SECTION_ASM_OP
5953 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5954 DATA_SECTION_ASM_OP
);
5957 #ifdef SDATA_SECTION_ASM_OP
5958 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5959 SDATA_SECTION_ASM_OP
);
5962 #ifdef READONLY_DATA_SECTION_ASM_OP
5963 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
5964 READONLY_DATA_SECTION_ASM_OP
);
5967 #ifdef CTORS_SECTION_ASM_OP
5968 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
5969 CTORS_SECTION_ASM_OP
);
5972 #ifdef DTORS_SECTION_ASM_OP
5973 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
5974 DTORS_SECTION_ASM_OP
);
5977 #ifdef BSS_SECTION_ASM_OP
5978 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5979 output_section_asm_op
,
5980 BSS_SECTION_ASM_OP
);
5983 #ifdef SBSS_SECTION_ASM_OP
5984 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5985 output_section_asm_op
,
5986 SBSS_SECTION_ASM_OP
);
5989 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5990 | SECTION_COMMON
, emit_tls_common
);
5991 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5992 | SECTION_COMMON
, emit_local
);
5993 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5994 | SECTION_COMMON
, emit_common
);
5996 #if defined ASM_OUTPUT_ALIGNED_BSS
5997 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
6001 targetm
.asm_out
.init_sections ();
6003 if (readonly_data_section
== NULL
)
6004 readonly_data_section
= text_section
;
6006 #ifdef ASM_OUTPUT_EXTERNAL
6007 pending_assemble_externals_set
= pointer_set_create ();
6012 decl_default_tls_model (const_tree decl
)
6014 enum tls_model kind
;
6017 is_local
= targetm
.binds_local_p (decl
);
6021 kind
= TLS_MODEL_LOCAL_EXEC
;
6023 kind
= TLS_MODEL_INITIAL_EXEC
;
6026 /* Local dynamic is inefficient when we're not combining the
6027 parts of the address. */
6028 else if (optimize
&& is_local
)
6029 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
6031 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
6032 if (kind
< flag_tls_default
)
6033 kind
= flag_tls_default
;
6038 /* Select a set of attributes for section NAME based on the properties
6039 of DECL and whether or not RELOC indicates that DECL's initializer
6040 might contain runtime relocations.
6042 We make the section read-only and executable for a function decl,
6043 read-only for a const data decl, and writable for a non-const data decl. */
6046 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6050 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6051 flags
= SECTION_CODE
;
6054 enum section_category category
6055 = categorize_decl_for_section (decl
, reloc
);
6056 if (decl_readonly_section_1 (category
))
6058 else if (category
== SECCAT_DATA_REL_RO
6059 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6060 flags
= SECTION_WRITE
| SECTION_RELRO
;
6062 flags
= SECTION_WRITE
;
6066 flags
= SECTION_WRITE
;
6067 if (strcmp (name
, ".data.rel.ro") == 0
6068 || strcmp (name
, ".data.rel.ro.local") == 0)
6069 flags
|= SECTION_RELRO
;
6072 if (decl
&& DECL_P (decl
) && DECL_ONE_ONLY (decl
))
6073 flags
|= SECTION_LINKONCE
;
6075 if (strcmp (name
, ".vtable_map_vars") == 0)
6076 flags
|= SECTION_LINKONCE
;
6078 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6079 flags
|= SECTION_TLS
| SECTION_WRITE
;
6081 if (strcmp (name
, ".bss") == 0
6082 || strncmp (name
, ".bss.", 5) == 0
6083 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6084 || strcmp (name
, ".sbss") == 0
6085 || strncmp (name
, ".sbss.", 6) == 0
6086 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6087 flags
|= SECTION_BSS
;
6089 if (strcmp (name
, ".tdata") == 0
6090 || strncmp (name
, ".tdata.", 7) == 0
6091 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6092 flags
|= SECTION_TLS
;
6094 if (strcmp (name
, ".tbss") == 0
6095 || strncmp (name
, ".tbss.", 6) == 0
6096 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6097 flags
|= SECTION_TLS
| SECTION_BSS
;
6099 /* These three sections have special ELF types. They are neither
6100 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6101 want to print a section type (@progbits or @nobits). If someone
6102 is silly enough to emit code or TLS variables to one of these
6103 sections, then don't handle them specially. */
6104 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6105 && (strcmp (name
, ".init_array") == 0
6106 || strcmp (name
, ".fini_array") == 0
6107 || strcmp (name
, ".preinit_array") == 0))
6108 flags
|= SECTION_NOTYPE
;
6113 /* Return true if the target supports some form of global BSS,
6114 either through bss_noswitch_section, or by selecting a BSS
6115 section in TARGET_ASM_SELECT_SECTION. */
6118 have_global_bss_p (void)
6120 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6123 /* Output assembly to switch to section NAME with attribute FLAGS.
6124 Four variants for common object file formats. */
6127 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6128 unsigned int flags ATTRIBUTE_UNUSED
,
6129 tree decl ATTRIBUTE_UNUSED
)
6131 /* Some object formats don't support named sections at all. The
6132 front-end should already have flagged this as an error. */
6136 #ifndef TLS_SECTION_ASM_FLAG
6137 #define TLS_SECTION_ASM_FLAG 'T'
6141 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6142 tree decl ATTRIBUTE_UNUSED
)
6144 char flagchars
[10], *f
= flagchars
;
6146 /* If we have already declared this section, we can use an
6147 abbreviated form to switch back to it -- unless this section is
6148 part of a COMDAT groups, in which case GAS requires the full
6149 declaration every time. */
6150 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6151 && (flags
& SECTION_DECLARED
))
6153 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6157 if (!(flags
& SECTION_DEBUG
))
6159 if (flags
& SECTION_EXCLUDE
)
6161 if (flags
& SECTION_WRITE
)
6163 if (flags
& SECTION_CODE
)
6165 if (flags
& SECTION_SMALL
)
6167 if (flags
& SECTION_MERGE
)
6169 if (flags
& SECTION_STRINGS
)
6171 if (flags
& SECTION_TLS
)
6172 *f
++ = TLS_SECTION_ASM_FLAG
;
6173 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6177 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6179 if (!(flags
& SECTION_NOTYPE
))
6184 if (flags
& SECTION_BSS
)
6190 /* On platforms that use "@" as the assembly comment character,
6192 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6194 fprintf (asm_out_file
, format
, type
);
6196 if (flags
& SECTION_ENTSIZE
)
6197 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6198 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6200 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6201 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6203 fprintf (asm_out_file
, ",%s,comdat",
6204 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6208 putc ('\n', asm_out_file
);
6212 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6213 tree decl ATTRIBUTE_UNUSED
)
6215 char flagchars
[8], *f
= flagchars
;
6217 if (flags
& SECTION_WRITE
)
6219 if (flags
& SECTION_CODE
)
6223 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6227 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6230 default_coff_asm_named_section (name
, flags
, decl
);
6232 if (flags
& SECTION_LINKONCE
)
6234 /* Functions may have been compiled at various levels of
6235 optimization so we can't use `same_size' here.
6236 Instead, have the linker pick one. */
6237 fprintf (asm_out_file
, "\t.linkonce %s\n",
6238 (flags
& SECTION_CODE
? "discard" : "same_size"));
6242 /* The lame default section selector. */
6245 default_select_section (tree decl
, int reloc
,
6246 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6250 if (decl_readonly_section (decl
, reloc
))
6251 return readonly_data_section
;
6253 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6255 if (! ((flag_pic
&& reloc
)
6256 || !TREE_READONLY (decl
)
6257 || TREE_SIDE_EFFECTS (decl
)
6258 || !TREE_CONSTANT (decl
)))
6259 return readonly_data_section
;
6261 else if (TREE_CODE (decl
) == STRING_CST
)
6262 return readonly_data_section
;
6263 else if (! (flag_pic
&& reloc
))
6264 return readonly_data_section
;
6266 return data_section
;
6269 enum section_category
6270 categorize_decl_for_section (const_tree decl
, int reloc
)
6272 enum section_category ret
;
6274 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6276 else if (TREE_CODE (decl
) == STRING_CST
)
6278 if ((flag_sanitize
& SANITIZE_ADDRESS
)
6279 && asan_protect_global (CONST_CAST_TREE (decl
)))
6280 /* or !flag_merge_constants */
6281 return SECCAT_RODATA
;
6283 return SECCAT_RODATA_MERGE_STR
;
6285 else if (TREE_CODE (decl
) == VAR_DECL
)
6287 if (bss_initializer_p (decl
))
6289 else if (! TREE_READONLY (decl
)
6290 || TREE_SIDE_EFFECTS (decl
)
6291 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6293 /* Here the reloc_rw_mask is not testing whether the section should
6294 be read-only or not, but whether the dynamic link will have to
6295 do something. If so, we wish to segregate the data in order to
6296 minimize cache misses inside the dynamic linker. */
6297 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6298 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6302 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6303 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6304 else if (reloc
|| flag_merge_constants
< 2
6305 || ((flag_sanitize
& SANITIZE_ADDRESS
)
6306 && asan_protect_global (CONST_CAST_TREE (decl
))))
6307 /* C and C++ don't allow different variables to share the same
6308 location. -fmerge-all-constants allows even that (at the
6309 expense of not conforming). */
6310 ret
= SECCAT_RODATA
;
6311 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6312 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6314 ret
= SECCAT_RODATA_MERGE_CONST
;
6316 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6318 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6319 || TREE_SIDE_EFFECTS (decl
)
6320 || ! TREE_CONSTANT (decl
))
6323 ret
= SECCAT_RODATA
;
6326 ret
= SECCAT_RODATA
;
6328 /* There are no read-only thread-local sections. */
6329 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6331 /* Note that this would be *just* SECCAT_BSS, except that there's
6332 no concept of a read-only thread-local-data section. */
6333 if (ret
== SECCAT_BSS
6334 || (flag_zero_initialized_in_bss
6335 && initializer_zerop (DECL_INITIAL (decl
))))
6341 /* If the target uses small data sections, select it. */
6342 else if (targetm
.in_small_data_p (decl
))
6344 if (ret
== SECCAT_BSS
)
6346 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6347 ret
= SECCAT_SRODATA
;
6356 decl_readonly_section_1 (enum section_category category
)
6361 case SECCAT_RODATA_MERGE_STR
:
6362 case SECCAT_RODATA_MERGE_STR_INIT
:
6363 case SECCAT_RODATA_MERGE_CONST
:
6364 case SECCAT_SRODATA
:
6372 decl_readonly_section (const_tree decl
, int reloc
)
6374 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6377 /* Select a section based on the above categorization. */
6380 default_elf_select_section (tree decl
, int reloc
,
6381 unsigned HOST_WIDE_INT align
)
6384 switch (categorize_decl_for_section (decl
, reloc
))
6387 /* We're not supposed to be called on FUNCTION_DECLs. */
6390 return readonly_data_section
;
6391 case SECCAT_RODATA_MERGE_STR
:
6392 return mergeable_string_section (decl
, align
, 0);
6393 case SECCAT_RODATA_MERGE_STR_INIT
:
6394 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6395 case SECCAT_RODATA_MERGE_CONST
:
6396 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6397 case SECCAT_SRODATA
:
6401 return data_section
;
6402 case SECCAT_DATA_REL
:
6403 sname
= ".data.rel";
6405 case SECCAT_DATA_REL_LOCAL
:
6406 sname
= ".data.rel.local";
6408 case SECCAT_DATA_REL_RO
:
6409 sname
= ".data.rel.ro";
6411 case SECCAT_DATA_REL_RO_LOCAL
:
6412 sname
= ".data.rel.ro.local";
6435 return get_named_section (decl
, sname
, reloc
);
6438 /* Construct a unique section name based on the decl name and the
6439 categorization performed above. */
6442 default_unique_section (tree decl
, int reloc
)
6444 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6445 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6446 const char *prefix
, *name
, *linkonce
;
6449 switch (categorize_decl_for_section (decl
, reloc
))
6452 prefix
= one_only
? ".t" : ".text";
6455 case SECCAT_RODATA_MERGE_STR
:
6456 case SECCAT_RODATA_MERGE_STR_INIT
:
6457 case SECCAT_RODATA_MERGE_CONST
:
6458 prefix
= one_only
? ".r" : ".rodata";
6460 case SECCAT_SRODATA
:
6461 prefix
= one_only
? ".s2" : ".sdata2";
6464 prefix
= one_only
? ".d" : ".data";
6466 case SECCAT_DATA_REL
:
6467 prefix
= one_only
? ".d.rel" : ".data.rel";
6469 case SECCAT_DATA_REL_LOCAL
:
6470 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6472 case SECCAT_DATA_REL_RO
:
6473 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6475 case SECCAT_DATA_REL_RO_LOCAL
:
6476 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6479 prefix
= one_only
? ".s" : ".sdata";
6482 prefix
= one_only
? ".b" : ".bss";
6485 prefix
= one_only
? ".sb" : ".sbss";
6488 prefix
= one_only
? ".td" : ".tdata";
6491 prefix
= one_only
? ".tb" : ".tbss";
6497 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
6498 name
= targetm
.strip_name_encoding (name
);
6500 /* If we're using one_only, then there needs to be a .gnu.linkonce
6501 prefix to the section name. */
6502 linkonce
= one_only
? ".gnu.linkonce" : "";
6504 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6506 DECL_SECTION_NAME (decl
) = build_string (strlen (string
), string
);
6509 /* Like compute_reloc_for_constant, except for an RTX. The return value
6510 is a mask for which bit 1 indicates a global relocation, and bit 0
6511 indicates a local relocation. */
6514 compute_reloc_for_rtx_1 (rtx
*xp
, void *data
)
6516 int *preloc
= (int *) data
;
6519 switch (GET_CODE (x
))
6522 *preloc
|= SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6535 compute_reloc_for_rtx (rtx x
)
6539 switch (GET_CODE (x
))
6545 for_each_rtx (&x
, compute_reloc_for_rtx_1
, &reloc
);
6554 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
6556 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6558 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6559 return data_section
;
6561 return readonly_data_section
;
6565 default_elf_select_rtx_section (enum machine_mode mode
, rtx x
,
6566 unsigned HOST_WIDE_INT align
)
6568 int reloc
= compute_reloc_for_rtx (x
);
6570 /* ??? Handle small data here somehow. */
6572 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6575 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6577 return get_named_section (NULL
, ".data.rel.ro", 3);
6580 return mergeable_constant_section (mode
, align
, 0);
6583 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6586 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6591 /* Careful not to prod global register variables. */
6594 symbol
= XEXP (rtl
, 0);
6595 if (GET_CODE (symbol
) != SYMBOL_REF
)
6598 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6599 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6600 flags
|= SYMBOL_FLAG_FUNCTION
;
6601 if (targetm
.binds_local_p (decl
))
6602 flags
|= SYMBOL_FLAG_LOCAL
;
6603 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6604 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6605 else if (targetm
.in_small_data_p (decl
))
6606 flags
|= SYMBOL_FLAG_SMALL
;
6607 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6608 being PUBLIC, the thing *must* be defined in this translation unit.
6609 Prevent this buglet from being propagated into rtl code as well. */
6610 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6611 flags
|= SYMBOL_FLAG_EXTERNAL
;
6613 SYMBOL_REF_FLAGS (symbol
) = flags
;
6616 /* By default, we do nothing for encode_section_info, so we need not
6617 do anything but discard the '*' marker. */
6620 default_strip_name_encoding (const char *str
)
6622 return str
+ (*str
== '*');
6625 #ifdef ASM_OUTPUT_DEF
6626 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6627 anchor relative to ".", the current section position. */
6630 default_asm_output_anchor (rtx symbol
)
6634 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6635 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6636 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6640 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6643 default_use_anchors_for_symbol_p (const_rtx symbol
)
6648 /* Don't use anchors for mergeable sections. The linker might move
6649 the objects around. */
6650 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6651 if (sect
->common
.flags
& SECTION_MERGE
)
6654 /* Don't use anchors for small data sections. The small data register
6655 acts as an anchor for such sections. */
6656 if (sect
->common
.flags
& SECTION_SMALL
)
6659 decl
= SYMBOL_REF_DECL (symbol
);
6660 if (decl
&& DECL_P (decl
))
6662 /* Don't use section anchors for decls that might be defined or
6663 usurped by other modules. */
6664 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
6667 /* Don't use section anchors for decls that will be placed in a
6668 small data section. */
6669 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6670 one above. The problem is that we only use SECTION_SMALL for
6671 sections that should be marked as small in the section directive. */
6672 if (targetm
.in_small_data_p (decl
))
6678 /* Return true when RESOLUTION indicate that symbol will be bound to the
6679 definition provided by current .o file. */
6682 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6684 return (resolution
== LDPR_PREVAILING_DEF
6685 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6686 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6689 /* Return true when RESOLUTION indicate that symbol will be bound locally
6690 within current executable or DSO. */
6693 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6695 return (resolution
== LDPR_PREVAILING_DEF
6696 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6697 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6698 || resolution
== LDPR_PREEMPTED_REG
6699 || resolution
== LDPR_PREEMPTED_IR
6700 || resolution
== LDPR_RESOLVED_IR
6701 || resolution
== LDPR_RESOLVED_EXEC
);
6704 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6705 wrt cross-module name binding. */
6708 default_binds_local_p (const_tree exp
)
6710 return default_binds_local_p_1 (exp
, flag_shlib
);
6714 default_binds_local_p_1 (const_tree exp
, int shlib
)
6717 bool resolved_locally
= false;
6718 bool resolved_to_local_def
= false;
6720 /* With resolution file in hands, take look into resolutions.
6721 We can't just return true for resolved_locally symbols,
6722 because dynamic linking might overwrite symbols
6723 in shared libraries. */
6724 if (TREE_CODE (exp
) == VAR_DECL
&& TREE_PUBLIC (exp
)
6725 && (TREE_STATIC (exp
) || DECL_EXTERNAL (exp
)))
6727 struct varpool_node
*vnode
= varpool_get_node (exp
);
6728 if (vnode
&& resolution_local_p (vnode
->resolution
))
6729 resolved_locally
= true;
6731 && resolution_to_local_definition_p (vnode
->resolution
))
6732 resolved_to_local_def
= true;
6734 else if (TREE_CODE (exp
) == FUNCTION_DECL
&& TREE_PUBLIC (exp
))
6736 struct cgraph_node
*node
= cgraph_get_node (exp
);
6738 && resolution_local_p (node
->resolution
))
6739 resolved_locally
= true;
6741 && resolution_to_local_definition_p (node
->resolution
))
6742 resolved_to_local_def
= true;
6745 /* A non-decl is an entry in the constant pool. */
6748 /* Weakrefs may not bind locally, even though the weakref itself is always
6749 static and therefore local. Similarly, the resolver for ifunc functions
6750 might resolve to a non-local function.
6751 FIXME: We can resolve the weakref case more curefuly by looking at the
6753 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6754 || (TREE_CODE (exp
) == FUNCTION_DECL
6755 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6757 /* Static variables are always local. */
6758 else if (! TREE_PUBLIC (exp
))
6760 /* A variable is local if the user has said explicitly that it will
6762 else if ((DECL_VISIBILITY_SPECIFIED (exp
)
6763 || resolved_to_local_def
)
6764 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6766 /* Variables defined outside this object might not be local. */
6767 else if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6769 /* If defined in this object and visibility is not default, must be
6771 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6773 /* Default visibility weak data can be overridden by a strong symbol
6774 in another module and so are not local. */
6775 else if (DECL_WEAK (exp
)
6776 && !resolved_locally
)
6778 /* If PIC, then assume that any global name can be overridden by
6779 symbols resolved from other modules. */
6782 /* Uninitialized COMMON variable may be unified with symbols
6783 resolved from other modules. */
6784 else if (DECL_COMMON (exp
)
6785 && !resolved_locally
6786 && (DECL_INITIAL (exp
) == NULL
6787 || DECL_INITIAL (exp
) == error_mark_node
))
6789 /* Otherwise we're left with initialized (or non-common) global data
6790 which is of necessity defined locally. */
6797 /* Return true when references to DECL must bind to current definition in
6800 The condition is usually equivalent to whether the function binds to the
6801 current module (shared library or executable), that is to binds_local_p.
6802 We use this fact to avoid need for another target hook and implement
6803 the logic using binds_local_p and just special cases where
6804 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6805 the weak definitions (that can be overwritten at linktime by other
6806 definition from different object file) and when resolution info is available
6807 we simply use the knowledge passed to us by linker plugin. */
6809 decl_binds_to_current_def_p (tree decl
)
6811 gcc_assert (DECL_P (decl
));
6812 if (!targetm
.binds_local_p (decl
))
6814 if (!TREE_PUBLIC (decl
))
6816 /* When resolution is available, just use it. */
6817 if (TREE_CODE (decl
) == VAR_DECL
6818 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)))
6820 struct varpool_node
*vnode
= varpool_get_node (decl
);
6822 && vnode
->resolution
!= LDPR_UNKNOWN
)
6823 return resolution_to_local_definition_p (vnode
->resolution
);
6825 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
6827 struct cgraph_node
*node
= cgraph_get_node (decl
);
6829 && node
->resolution
!= LDPR_UNKNOWN
)
6830 return resolution_to_local_definition_p (node
->resolution
);
6832 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6833 binds locally but still can be overwritten), DECL_COMMON (can be merged
6834 with a non-common definition somewhere in the same module) or
6836 This rely on fact that binds_local_p behave as decl_replaceable_p
6837 for all other declaration types. */
6838 if (DECL_WEAK (decl
))
6840 if (DECL_COMMON (decl
)
6841 && (DECL_INITIAL (decl
) == NULL
6842 || DECL_INITIAL (decl
) == error_mark_node
))
6844 if (DECL_EXTERNAL (decl
))
6849 /* A replaceable function or variable is one which may be replaced
6850 at link-time with an entirely different definition, provided that the
6851 replacement has the same type. For example, functions declared
6852 with __attribute__((weak)) on most systems are replaceable.
6854 COMDAT functions are not replaceable, since all definitions of the
6855 function must be equivalent. It is important that COMDAT functions
6856 not be treated as replaceable so that use of C++ template
6857 instantiations is not penalized. */
6860 decl_replaceable_p (tree decl
)
6862 gcc_assert (DECL_P (decl
));
6863 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
6865 return !decl_binds_to_current_def_p (decl
);
6868 /* Default function to output code that will globalize a label. A
6869 target must define GLOBAL_ASM_OP or provide its own function to
6870 globalize a label. */
6871 #ifdef GLOBAL_ASM_OP
6873 default_globalize_label (FILE * stream
, const char *name
)
6875 fputs (GLOBAL_ASM_OP
, stream
);
6876 assemble_name (stream
, name
);
6877 putc ('\n', stream
);
6879 #endif /* GLOBAL_ASM_OP */
6881 /* Default function to output code that will globalize a declaration. */
6883 default_globalize_decl_name (FILE * stream
, tree decl
)
6885 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6886 targetm
.asm_out
.globalize_label (stream
, name
);
6889 /* Default function to output a label for unwind information. The
6890 default is to do nothing. A target that needs nonlocal labels for
6891 unwind information must provide its own function to do this. */
6893 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6894 tree decl ATTRIBUTE_UNUSED
,
6895 int for_eh ATTRIBUTE_UNUSED
,
6896 int empty ATTRIBUTE_UNUSED
)
6900 /* Default function to output a label to divide up the exception table.
6901 The default is to do nothing. A target that needs/wants to divide
6902 up the table must provide it's own function to do this. */
6904 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
6908 /* This is how to output an internal numbered label where PREFIX is
6909 the class of label and LABELNO is the number within the class. */
6912 default_generate_internal_label (char *buf
, const char *prefix
,
6913 unsigned long labelno
)
6915 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6918 /* This is how to output an internal numbered label where PREFIX is
6919 the class of label and LABELNO is the number within the class. */
6922 default_internal_label (FILE *stream
, const char *prefix
,
6923 unsigned long labelno
)
6925 char *const buf
= (char *) alloca (40 + strlen (prefix
));
6926 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6927 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
6931 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
6934 default_asm_declare_constant_name (FILE *file
, const char *name
,
6935 const_tree exp ATTRIBUTE_UNUSED
,
6936 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
6938 assemble_label (file
, name
);
6941 /* This is the default behavior at the beginning of a file. It's
6942 controlled by two other target-hook toggles. */
6944 default_file_start (void)
6946 if (targetm
.asm_file_start_app_off
6947 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
6948 fputs (ASM_APP_OFF
, asm_out_file
);
6950 if (targetm
.asm_file_start_file_directive
)
6951 output_file_directive (asm_out_file
, main_input_filename
);
6954 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6955 which emits a special section directive used to indicate whether or
6956 not this object file needs an executable stack. This is primarily
6957 a GNU extension to ELF but could be used on other targets. */
6959 int trampolines_created
;
6962 file_end_indicate_exec_stack (void)
6964 unsigned int flags
= SECTION_DEBUG
;
6965 if (trampolines_created
)
6966 flags
|= SECTION_CODE
;
6968 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
6971 /* Emit a special section directive to indicate that this object file
6972 was compiled with -fsplit-stack. This is used to let the linker
6973 detect calls between split-stack code and non-split-stack code, so
6974 that it can modify the split-stack code to allocate a sufficiently
6975 large stack. We emit another special section if there are any
6976 functions in this file which have the no_split_stack attribute, to
6977 prevent the linker from warning about being unable to convert the
6978 functions if they call non-split-stack code. */
6981 file_end_indicate_split_stack (void)
6983 if (flag_split_stack
)
6985 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
6987 if (saw_no_split_stack
)
6988 switch_to_section (get_section (".note.GNU-no-split-stack",
6989 SECTION_DEBUG
, NULL
));
6993 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6994 a get_unnamed_section callback. */
6997 output_section_asm_op (const void *directive
)
6999 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
7002 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
7003 the current section is NEW_SECTION. */
7006 switch_to_section (section
*new_section
)
7008 if (in_section
== new_section
)
7011 if (new_section
->common
.flags
& SECTION_FORGET
)
7014 in_section
= new_section
;
7016 switch (SECTION_STYLE (new_section
))
7019 targetm
.asm_out
.named_section (new_section
->named
.name
,
7020 new_section
->named
.common
.flags
,
7021 new_section
->named
.decl
);
7024 case SECTION_UNNAMED
:
7025 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
7028 case SECTION_NOSWITCH
:
7033 new_section
->common
.flags
|= SECTION_DECLARED
;
7036 /* If block symbol SYMBOL has not yet been assigned an offset, place
7037 it at the end of its block. */
7040 place_block_symbol (rtx symbol
)
7042 unsigned HOST_WIDE_INT size
, mask
, offset
;
7043 struct constant_descriptor_rtx
*desc
;
7044 unsigned int alignment
;
7045 struct object_block
*block
;
7048 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7049 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7052 /* Work out the symbol's size and alignment. */
7053 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7055 desc
= SYMBOL_REF_CONSTANT (symbol
);
7056 alignment
= desc
->align
;
7057 size
= GET_MODE_SIZE (desc
->mode
);
7059 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7061 decl
= SYMBOL_REF_DECL (symbol
);
7062 alignment
= DECL_ALIGN (decl
);
7063 size
= get_constant_size (DECL_INITIAL (decl
));
7064 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7065 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7066 && asan_protect_global (DECL_INITIAL (decl
)))
7067 size
+= asan_red_zone_size (size
);
7071 decl
= SYMBOL_REF_DECL (symbol
);
7072 alignment
= get_variable_align (decl
);
7073 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
7074 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7075 && asan_protect_global (decl
))
7077 size
+= asan_red_zone_size (size
);
7078 alignment
= MAX (alignment
,
7079 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7083 /* Calculate the object's offset from the start of the block. */
7084 block
= SYMBOL_REF_BLOCK (symbol
);
7085 mask
= alignment
/ BITS_PER_UNIT
- 1;
7086 offset
= (block
->size
+ mask
) & ~mask
;
7087 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7089 /* Record the block's new alignment and size. */
7090 block
->alignment
= MAX (block
->alignment
, alignment
);
7091 block
->size
= offset
+ size
;
7093 vec_safe_push (block
->objects
, symbol
);
7096 /* Return the anchor that should be used to address byte offset OFFSET
7097 from the first object in BLOCK. MODEL is the TLS model used
7101 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7102 enum tls_model model
)
7105 unsigned int begin
, middle
, end
;
7106 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7109 /* Work out the anchor's offset. Use an offset of 0 for the first
7110 anchor so that we don't pessimize the case where we take the address
7111 of a variable at the beginning of the block. This is particularly
7112 useful when a block has only one variable assigned to it.
7114 We try to place anchors RANGE bytes apart, so there can then be
7115 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7116 a ptr_mode offset. With some target settings, the lowest such
7117 anchor might be out of range for the lowest ptr_mode offset;
7118 likewise the highest anchor for the highest offset. Use anchors
7119 at the extreme ends of the ptr_mode range in such cases.
7121 All arithmetic uses unsigned integers in order to avoid
7123 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7124 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7125 range
= max_offset
- min_offset
+ 1;
7130 bias
= 1 << (GET_MODE_BITSIZE (ptr_mode
) - 1);
7133 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7134 delta
-= delta
% range
;
7137 offset
= (HOST_WIDE_INT
) (-delta
);
7141 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7142 delta
-= delta
% range
;
7143 if (delta
> bias
- 1)
7145 offset
= (HOST_WIDE_INT
) delta
;
7149 /* Do a binary search to see if there's already an anchor we can use.
7150 Set BEGIN to the new anchor's index if not. */
7152 end
= vec_safe_length (block
->anchors
);
7153 while (begin
!= end
)
7155 middle
= (end
+ begin
) / 2;
7156 anchor
= (*block
->anchors
)[middle
];
7157 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7159 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7161 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7163 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7169 /* Create a new anchor with a unique label. */
7170 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7171 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7172 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7173 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7175 /* Insert it at index BEGIN. */
7176 vec_safe_insert (block
->anchors
, begin
, anchor
);
7180 /* Output the objects in BLOCK. */
7183 output_object_block (struct object_block
*block
)
7185 struct constant_descriptor_rtx
*desc
;
7187 HOST_WIDE_INT offset
;
7191 if (!block
->objects
)
7194 /* Switch to the section and make sure that the first byte is
7195 suitably aligned. */
7196 switch_to_section (block
->sect
);
7197 assemble_align (block
->alignment
);
7199 /* Define the values of all anchors relative to the current section
7201 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7202 targetm
.asm_out
.output_anchor (symbol
);
7204 /* Output the objects themselves. */
7206 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7208 /* Move to the object's offset, padding with zeros if necessary. */
7209 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7210 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7211 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7213 desc
= SYMBOL_REF_CONSTANT (symbol
);
7214 output_constant_pool_1 (desc
, 1);
7215 offset
+= GET_MODE_SIZE (desc
->mode
);
7217 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7220 decl
= SYMBOL_REF_DECL (symbol
);
7221 assemble_constant_contents (DECL_INITIAL (decl
), XSTR (symbol
, 0),
7223 size
= get_constant_size (DECL_INITIAL (decl
));
7225 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7226 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7227 && asan_protect_global (DECL_INITIAL (decl
)))
7229 size
= asan_red_zone_size (size
);
7230 assemble_zeros (size
);
7237 decl
= SYMBOL_REF_DECL (symbol
);
7238 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7239 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
7241 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7242 && asan_protect_global (decl
))
7244 size
= asan_red_zone_size (size
);
7245 assemble_zeros (size
);
7252 /* A htab_traverse callback used to call output_object_block for
7253 each member of object_block_htab. */
7256 output_object_block_htab (void **slot
, void *data ATTRIBUTE_UNUSED
)
7258 output_object_block ((struct object_block
*) (*slot
));
7262 /* Output the definitions of all object_blocks. */
7265 output_object_blocks (void)
7267 htab_traverse (object_block_htab
, output_object_block_htab
, NULL
);
7270 /* This function provides a possible implementation of the
7271 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7272 by -frecord-gcc-switches it creates a new mergeable, string section in the
7273 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7274 contains the switches in ASCII format.
7276 FIXME: This code does not correctly handle double quote characters
7277 that appear inside strings, (it strips them rather than preserving them).
7278 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7279 characters - instead it treats them as sub-string separators. Since
7280 we want to emit NUL strings terminators into the object file we have to use
7284 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7288 case SWITCH_TYPE_PASSED
:
7289 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7290 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7293 case SWITCH_TYPE_DESCRIPTIVE
:
7296 /* Distinguish between invocations where name is NULL. */
7297 static bool started
= false;
7303 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7307 | (SECTION_ENTSIZE
& 1),
7309 switch_to_section (sec
);
7318 /* The return value is currently ignored by the caller, but must be 0.
7319 For -fverbose-asm the return value would be the number of characters
7320 emitted into the assembler file. */
7324 /* Emit text to declare externally defined symbols. It is needed to
7325 properly support non-default visibility. */
7327 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7329 const char *name ATTRIBUTE_UNUSED
)
7331 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7332 set in order to avoid putting out names that are never really
7334 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7335 && targetm
.binds_local_p (decl
))
7336 maybe_assemble_visibility (decl
);
7339 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7342 default_asm_output_source_filename (FILE *file
, const char *name
)
7344 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7345 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7347 fprintf (file
, "\t.file\t");
7348 output_quoted_string (file
, name
);
7353 /* Output a file name in the form wanted by System V. */
7356 output_file_directive (FILE *asm_file
, const char *input_name
)
7361 if (input_name
== NULL
)
7362 input_name
= "<stdin>";
7364 input_name
= remap_debug_filename (input_name
);
7366 len
= strlen (input_name
);
7367 na
= input_name
+ len
;
7369 /* NA gets INPUT_NAME sans directory names. */
7370 while (na
> input_name
)
7372 if (IS_DIR_SEPARATOR (na
[-1]))
7377 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7380 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7383 make_debug_expr_from_rtl (const_rtx exp
)
7385 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7386 enum machine_mode mode
= GET_MODE (exp
);
7389 DECL_ARTIFICIAL (ddecl
) = 1;
7390 if (REG_P (exp
) && REG_EXPR (exp
))
7391 type
= TREE_TYPE (REG_EXPR (exp
));
7392 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7393 type
= TREE_TYPE (MEM_EXPR (exp
));
7396 if (type
&& TYPE_MODE (type
) == mode
)
7397 TREE_TYPE (ddecl
) = type
;
7399 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7400 DECL_MODE (ddecl
) = mode
;
7401 dval
= gen_rtx_DEBUG_EXPR (mode
);
7402 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7403 SET_DECL_RTL (ddecl
, dval
);
7407 #ifdef ELF_ASCII_ESCAPES
7408 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7411 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7416 fputs (STRING_ASM_OP
, f
);
7421 escape
= ELF_ASCII_ESCAPES
[c
];
7428 /* TODO: Print in hex with fast function, important for -flto. */
7429 fprintf (f
, "\\%03o", c
);
7442 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7445 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7447 const char *limit
= s
+ len
;
7448 const char *last_null
= NULL
;
7449 unsigned bytes_in_chunk
= 0;
7453 for (; s
< limit
; s
++)
7457 if (bytes_in_chunk
>= 60)
7466 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7473 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7475 if (bytes_in_chunk
> 0)
7482 default_elf_asm_output_limited_string (f
, s
);
7487 if (bytes_in_chunk
== 0)
7488 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7491 escape
= ELF_ASCII_ESCAPES
[c
];
7499 /* TODO: Print in hex with fast function, important for -flto. */
7500 fprintf (f
, "\\%03o", c
);
7501 bytes_in_chunk
+= 4;
7506 bytes_in_chunk
+= 2;
7513 if (bytes_in_chunk
> 0)
7521 static GTY(()) section
*elf_init_array_section
;
7522 static GTY(()) section
*elf_fini_array_section
;
7525 get_elf_initfini_array_priority_section (int priority
,
7529 if (priority
!= DEFAULT_INIT_PRIORITY
)
7532 sprintf (buf
, "%s.%.5u",
7533 constructor_p
? ".init_array" : ".fini_array",
7535 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7541 if (elf_init_array_section
== NULL
)
7542 elf_init_array_section
7543 = get_section (".init_array",
7544 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7545 sec
= elf_init_array_section
;
7549 if (elf_fini_array_section
== NULL
)
7550 elf_fini_array_section
7551 = get_section (".fini_array",
7552 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7553 sec
= elf_fini_array_section
;
7559 /* Use .init_array section for constructors. */
7562 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7564 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7566 assemble_addr_to_section (symbol
, sec
);
7569 /* Use .fini_array section for destructors. */
7572 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7574 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7576 assemble_addr_to_section (symbol
, sec
);
7579 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7581 This is a bit of a cheat. The real default is a no-op, but this
7582 hook is the default for all targets with a .ident directive. */
7585 default_asm_output_ident_directive (const char *ident_str
)
7587 const char *ident_asm_op
= "\t.ident\t";
7589 /* If we are still in the front end, do not write out the string
7590 to asm_out_file. Instead, add a fake top-level asm statement.
7591 This allows the front ends to use this hook without actually
7592 writing to asm_out_file, to handle #ident or Pragma Ident. */
7593 if (cgraph_state
== CGRAPH_STATE_PARSING
)
7595 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7596 add_asm_node (build_string (strlen (buf
), buf
));
7599 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7602 #include "gt-varasm.h"