1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987-2014 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
21 /* This file handles generation of all the assembler code
22 *except* the instructions of a function.
23 This includes declarations of variables and their initial values.
25 We also output the assembler code for constants stored in memory
26 and are responsible for combining constants with the same value. */
30 #include "coretypes.h"
34 #include "stor-layout.h"
35 #include "stringpool.h"
40 #include "hard-reg-set.h"
43 #include "diagnostic-core.h"
46 #include "langhooks.h"
50 #include "common/common-target.h"
51 #include "targhooks.h"
55 #include "basic-block.h"
58 #ifdef XCOFF_DEBUGGING_INFO
59 #include "xcoffout.h" /* Needed for external data
60 declarations for e.g. AIX 4.x. */
63 /* The (assembler) name of the first globally-visible object output. */
64 extern GTY(()) const char *first_global_object_name
;
65 extern GTY(()) const char *weak_global_object_name
;
67 const char *first_global_object_name
;
68 const char *weak_global_object_name
;
71 struct constant_descriptor_rtx
;
72 struct rtx_constant_pool
;
74 #define n_deferred_constants (crtl->varasm.deferred_constants)
76 /* Number for making the label on the next
77 constant that is stored in memory. */
79 static GTY(()) int const_labelno
;
81 /* Carry information from ASM_DECLARE_OBJECT_NAME
82 to ASM_FINISH_DECLARE_OBJECT. */
84 int size_directive_output
;
86 /* The last decl for which assemble_variable was called,
87 if it did ASM_DECLARE_OBJECT_NAME.
88 If the last call to assemble_variable didn't do that,
91 tree last_assemble_variable_decl
;
93 /* The following global variable indicates if the first basic block
94 in a function belongs to the cold partition or not. */
96 bool first_function_block_is_cold
;
98 /* We give all constants their own alias set. Perhaps redundant with
99 MEM_READONLY_P, but pre-dates it. */
101 static alias_set_type const_alias_set
;
103 /* Whether we saw any functions with no_split_stack. */
105 static bool saw_no_split_stack
;
107 static const char *strip_reg_name (const char *);
108 static int contains_pointers_p (tree
);
109 #ifdef ASM_OUTPUT_EXTERNAL
110 static bool incorporeal_function_p (tree
);
112 static void decode_addr_const (tree
, struct addr_const
*);
113 static hashval_t
const_desc_hash (const void *);
114 static int const_desc_eq (const void *, const void *);
115 static hashval_t
const_hash_1 (const tree
);
116 static int compare_constant (const tree
, const tree
);
117 static void output_constant_def_contents (rtx
);
118 static void output_addressed_constants (tree
);
119 static unsigned HOST_WIDE_INT
output_constant (tree
, unsigned HOST_WIDE_INT
,
121 static void globalize_decl (tree
);
122 static bool decl_readonly_section_1 (enum section_category
);
123 #ifdef BSS_SECTION_ASM_OP
124 #ifdef ASM_OUTPUT_ALIGNED_BSS
125 static void asm_output_aligned_bss (FILE *, tree
, const char *,
126 unsigned HOST_WIDE_INT
, int)
129 #endif /* BSS_SECTION_ASM_OP */
130 static void mark_weak (tree
);
131 static void output_constant_pool (const char *, tree
);
133 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
134 section
*text_section
;
135 section
*data_section
;
136 section
*readonly_data_section
;
137 section
*sdata_section
;
138 section
*ctors_section
;
139 section
*dtors_section
;
140 section
*bss_section
;
141 section
*sbss_section
;
143 /* Various forms of common section. All are guaranteed to be nonnull. */
144 section
*tls_comm_section
;
145 section
*comm_section
;
146 section
*lcomm_section
;
148 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
150 section
*bss_noswitch_section
;
152 /* The section that holds the main exception table, when known. The section
153 is set either by the target's init_sections hook or by the first call to
154 switch_to_exception_section. */
155 section
*exception_section
;
157 /* The section that holds the DWARF2 frame unwind information, when known.
158 The section is set either by the target's init_sections hook or by the
159 first call to switch_to_eh_frame_section. */
160 section
*eh_frame_section
;
162 /* asm_out_file's current section. This is NULL if no section has yet
163 been selected or if we lose track of what the current section is. */
166 /* True if code for the current function is currently being directed
167 at the cold section. */
168 bool in_cold_section_p
;
170 /* A linked list of all the unnamed sections. */
171 static GTY(()) section
*unnamed_sections
;
173 /* Return a nonzero value if DECL has a section attribute. */
174 #define IN_NAMED_SECTION(DECL) \
175 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
176 && DECL_SECTION_NAME (DECL) != NULL)
178 /* Hash table of named sections. */
179 static GTY((param_is (section
))) htab_t section_htab
;
181 /* A table of object_blocks, indexed by section. */
182 static GTY((param_is (struct object_block
))) htab_t object_block_htab
;
184 /* The next number to use for internal anchor labels. */
185 static GTY(()) int anchor_labelno
;
187 /* A pool of constants that can be shared between functions. */
188 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
190 /* Helper routines for maintaining section_htab. */
193 section_entry_eq (const void *p1
, const void *p2
)
195 const section
*old
= (const section
*) p1
;
196 const char *new_name
= (const char *) p2
;
198 return strcmp (old
->named
.name
, new_name
) == 0;
202 section_entry_hash (const void *p
)
204 const section
*old
= (const section
*) p
;
205 return htab_hash_string (old
->named
.name
);
208 /* Return a hash value for section SECT. */
211 hash_section (section
*sect
)
213 if (sect
->common
.flags
& SECTION_NAMED
)
214 return htab_hash_string (sect
->named
.name
);
215 return sect
->common
.flags
;
218 /* Helper routines for maintaining object_block_htab. */
221 object_block_entry_eq (const void *p1
, const void *p2
)
223 const struct object_block
*old
= (const struct object_block
*) p1
;
224 const section
*new_section
= (const section
*) p2
;
226 return old
->sect
== new_section
;
230 object_block_entry_hash (const void *p
)
232 const struct object_block
*old
= (const struct object_block
*) p
;
233 return hash_section (old
->sect
);
236 /* Return a new unnamed section with the given fields. */
239 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
244 sect
= ggc_alloc
<section
> ();
245 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
246 sect
->unnamed
.callback
= callback
;
247 sect
->unnamed
.data
= data
;
248 sect
->unnamed
.next
= unnamed_sections
;
250 unnamed_sections
= sect
;
254 /* Return a SECTION_NOSWITCH section with the given fields. */
257 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
261 sect
= ggc_alloc
<section
> ();
262 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
263 sect
->noswitch
.callback
= callback
;
268 /* Return the named section structure associated with NAME. Create
269 a new section with the given fields if no such structure exists. */
272 get_section (const char *name
, unsigned int flags
, tree decl
)
274 section
*sect
, **slot
;
277 htab_find_slot_with_hash (section_htab
, name
,
278 htab_hash_string (name
), INSERT
);
279 flags
|= SECTION_NAMED
;
282 sect
= ggc_alloc
<section
> ();
283 sect
->named
.common
.flags
= flags
;
284 sect
->named
.name
= ggc_strdup (name
);
285 sect
->named
.decl
= decl
;
291 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
292 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
294 /* It is fine if one of the section flags is
295 SECTION_WRITE | SECTION_RELRO and the other has none of these
296 flags (i.e. read-only) in named sections and either the
297 section hasn't been declared yet or has been declared as writable.
298 In that case just make sure the resulting flags are
299 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
301 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
302 == (SECTION_WRITE
| SECTION_RELRO
)
303 && (sect
->common
.flags
304 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
305 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
306 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
307 || (sect
->common
.flags
& SECTION_WRITE
)))
309 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
312 /* Sanity check user variables for flag changes. */
313 if (sect
->named
.decl
!= NULL
314 && DECL_P (sect
->named
.decl
)
315 && decl
!= sect
->named
.decl
)
317 if (decl
!= NULL
&& DECL_P (decl
))
318 error ("%+D causes a section type conflict with %D",
319 decl
, sect
->named
.decl
);
321 error ("section type conflict with %D", sect
->named
.decl
);
322 inform (DECL_SOURCE_LOCATION (sect
->named
.decl
),
323 "%qD was declared here", sect
->named
.decl
);
325 else if (decl
!= NULL
&& DECL_P (decl
))
326 error ("%+D causes a section type conflict", decl
);
328 error ("section type conflict");
329 /* Make sure we don't error about one section multiple times. */
330 sect
->common
.flags
|= SECTION_OVERRIDE
;
336 /* Return true if the current compilation mode benefits from having
337 objects grouped into blocks. */
340 use_object_blocks_p (void)
342 return flag_section_anchors
;
345 /* Return the object_block structure for section SECT. Create a new
346 structure if we haven't created one already. Return null if SECT
349 static struct object_block
*
350 get_block_for_section (section
*sect
)
352 struct object_block
*block
;
358 slot
= htab_find_slot_with_hash (object_block_htab
, sect
,
359 hash_section (sect
), INSERT
);
360 block
= (struct object_block
*) *slot
;
363 block
= ggc_cleared_alloc
<object_block
> ();
370 /* Create a symbol with label LABEL and place it at byte offset
371 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
372 is not yet known. LABEL must be a garbage-collected string. */
375 create_block_symbol (const char *label
, struct object_block
*block
,
376 HOST_WIDE_INT offset
)
381 /* Create the extended SYMBOL_REF. */
382 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
383 symbol
= (rtx
) ggc_internal_alloc (size
);
385 /* Initialize the normal SYMBOL_REF fields. */
386 memset (symbol
, 0, size
);
387 PUT_CODE (symbol
, SYMBOL_REF
);
388 PUT_MODE (symbol
, Pmode
);
389 XSTR (symbol
, 0) = label
;
390 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
392 /* Initialize the block_symbol stuff. */
393 SYMBOL_REF_BLOCK (symbol
) = block
;
394 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
399 /* Return a section with a particular name and with whatever SECTION_*
400 flags section_type_flags deems appropriate. The name of the section
401 is taken from NAME if nonnull, otherwise it is taken from DECL's
402 DECL_SECTION_NAME. DECL is the decl associated with the section
403 (see the section comment for details) and RELOC is as for
404 section_type_flags. */
407 get_named_section (tree decl
, const char *name
, int reloc
)
413 gcc_assert (decl
&& DECL_P (decl
) && DECL_SECTION_NAME (decl
));
414 name
= DECL_SECTION_NAME (decl
);
417 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
418 return get_section (name
, flags
, decl
);
421 /* Worker for resolve_unique_section. */
424 set_implicit_section (struct symtab_node
*n
, void *data ATTRIBUTE_UNUSED
)
426 n
->implicit_section
= true;
430 /* If required, set DECL_SECTION_NAME to a unique name. */
433 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
434 int flag_function_or_data_sections
)
436 if (DECL_SECTION_NAME (decl
) == NULL
437 && targetm_common
.have_named_sections
438 && (flag_function_or_data_sections
439 || DECL_COMDAT_GROUP (decl
)))
441 targetm
.asm_out
.unique_section (decl
, reloc
);
442 if (DECL_SECTION_NAME (decl
))
443 symtab_node::get (decl
)->call_for_symbol_and_aliases
444 (set_implicit_section
, NULL
, true);
448 #ifdef BSS_SECTION_ASM_OP
450 #ifdef ASM_OUTPUT_ALIGNED_BSS
452 /* Utility function for targets to use in implementing
453 ASM_OUTPUT_ALIGNED_BSS.
454 ??? It is believed that this function will work in most cases so such
455 support is localized here. */
458 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
459 const char *name
, unsigned HOST_WIDE_INT size
,
462 switch_to_section (bss_section
);
463 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
464 #ifdef ASM_DECLARE_OBJECT_NAME
465 last_assemble_variable_decl
= decl
;
466 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
468 /* Standard thing is just output label for the object. */
469 ASM_OUTPUT_LABEL (file
, name
);
470 #endif /* ASM_DECLARE_OBJECT_NAME */
471 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
476 #endif /* BSS_SECTION_ASM_OP */
478 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
479 /* Return the hot section for function DECL. Return text_section for
483 hot_function_section (tree decl
)
485 if (decl
!= NULL_TREE
486 && DECL_SECTION_NAME (decl
) != NULL
487 && targetm_common
.have_named_sections
)
488 return get_named_section (decl
, NULL
, 0);
494 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
497 When DECL_SECTION_NAME is non-NULL and it is implicit section and
498 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
499 concatenate the name with NAMED_SECTION_SUFFIX.
500 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
503 get_named_text_section (tree decl
,
504 const char *text_section_name
,
505 const char *named_section_suffix
)
507 if (decl
&& DECL_SECTION_NAME (decl
))
509 if (named_section_suffix
)
511 const char *dsn
= DECL_SECTION_NAME (decl
);
512 const char *stripped_name
;
515 name
= (char *) alloca (strlen (dsn
) + 1);
519 stripped_name
= targetm
.strip_name_encoding (name
);
521 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
522 return get_named_section (decl
, buffer
, 0);
524 else if (symtab_node::get (decl
)->implicit_section
)
528 /* Do not try to split gnu_linkonce functions. This gets somewhat
530 if (DECL_COMDAT_GROUP (decl
) && !HAVE_COMDAT_GROUP
)
532 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
533 name
= targetm
.strip_name_encoding (name
);
534 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
540 return get_named_section (decl
, text_section_name
, 0);
543 /* Choose named function section based on its frequency. */
546 default_function_section (tree decl
, enum node_frequency freq
,
547 bool startup
, bool exit
)
549 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
550 /* Old GNU linkers have buggy --gc-section support, which sometimes
551 results in .gcc_except_table* sections being garbage collected. */
553 && symtab_node::get (decl
)->implicit_section
)
557 if (!flag_reorder_functions
558 || !targetm_common
.have_named_sections
)
560 /* Startup code should go to startup subsection unless it is
561 unlikely executed (this happens especially with function splitting
562 where we can split away unnecessary parts of static constructors. */
563 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
565 /* If we do have a profile or(and) LTO phase is executed, we do not need
566 these ELF section. */
567 if (!in_lto_p
|| !flag_profile_values
)
568 return get_named_text_section (decl
, ".text.startup", NULL
);
573 /* Similarly for exit. */
574 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
575 return get_named_text_section (decl
, ".text.exit", NULL
);
577 /* Group cold functions together, similarly for hot code. */
580 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
581 return get_named_text_section (decl
, ".text.unlikely", NULL
);
582 case NODE_FREQUENCY_HOT
:
583 /* If we do have a profile or(and) LTO phase is executed, we do not need
584 these ELF section. */
585 if (!in_lto_p
|| !flag_profile_values
)
586 return get_named_text_section (decl
, ".text.hot", NULL
);
592 /* Return the section for function DECL.
594 If DECL is NULL_TREE, return the text section. We can be passed
595 NULL_TREE under some circumstances by dbxout.c at least.
597 If FORCE_COLD is true, return cold function section ignoring
598 the frequency info of cgraph_node. */
601 function_section_1 (tree decl
, bool force_cold
)
603 section
*section
= NULL
;
604 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
605 bool startup
= false, exit
= false;
609 struct cgraph_node
*node
= cgraph_node::get (decl
);
613 freq
= node
->frequency
;
614 startup
= node
->only_called_at_startup
;
615 exit
= node
->only_called_at_exit
;
619 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
621 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
622 if (decl
!= NULL_TREE
623 && DECL_SECTION_NAME (decl
) != NULL
)
625 if (targetm
.asm_out
.function_section
)
626 section
= targetm
.asm_out
.function_section (decl
, freq
,
630 return get_named_section (decl
, NULL
, 0);
633 return targetm
.asm_out
.select_section
634 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
637 if (targetm
.asm_out
.function_section
)
638 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
641 return hot_function_section (decl
);
645 /* Return the section for function DECL.
647 If DECL is NULL_TREE, return the text section. We can be passed
648 NULL_TREE under some circumstances by dbxout.c at least. */
651 function_section (tree decl
)
653 /* Handle cases where function splitting code decides
654 to put function entry point into unlikely executed section
655 despite the fact that the function itself is not cold
656 (i.e. it is called rarely but contains a hot loop that is
657 better to live in hot subsection for the code locality). */
658 return function_section_1 (decl
,
659 first_function_block_is_cold
);
662 /* Return the section for the current function, take IN_COLD_SECTION_P
666 current_function_section (void)
668 return function_section_1 (current_function_decl
, in_cold_section_p
);
671 /* Tell assembler to switch to unlikely-to-be-executed text section. */
674 unlikely_text_section (void)
676 return function_section_1 (current_function_decl
, true);
679 /* When called within a function context, return true if the function
680 has been assigned a cold text section and if SECT is that section.
681 When called outside a function context, return true if SECT is the
682 default cold section. */
685 unlikely_text_section_p (section
*sect
)
687 return sect
== function_section_1 (current_function_decl
, true);
690 /* Return the read-only data section associated with function DECL. */
693 default_function_rodata_section (tree decl
)
695 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
697 const char *name
= DECL_SECTION_NAME (decl
);
699 if (DECL_COMDAT_GROUP (decl
) && HAVE_COMDAT_GROUP
)
705 dot
= strchr (name
+ 1, '.');
708 len
= strlen (dot
) + 8;
709 rname
= (char *) alloca (len
);
711 strcpy (rname
, ".rodata");
713 return get_section (rname
, SECTION_LINKONCE
, decl
);
715 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
716 else if (DECL_COMDAT_GROUP (decl
)
717 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
719 size_t len
= strlen (name
) + 1;
720 char *rname
= (char *) alloca (len
);
722 memcpy (rname
, name
, len
);
724 return get_section (rname
, SECTION_LINKONCE
, decl
);
726 /* For .text.foo we want to use .rodata.foo. */
727 else if (flag_function_sections
&& flag_data_sections
728 && strncmp (name
, ".text.", 6) == 0)
730 size_t len
= strlen (name
) + 1;
731 char *rname
= (char *) alloca (len
+ 2);
733 memcpy (rname
, ".rodata", 7);
734 memcpy (rname
+ 7, name
+ 5, len
- 5);
735 return get_section (rname
, 0, decl
);
739 return readonly_data_section
;
742 /* Return the read-only data section associated with function DECL
743 for targets where that section should be always the single
744 readonly data section. */
747 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
749 return readonly_data_section
;
752 /* Return the section to use for string merging. */
755 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
756 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
757 unsigned int flags ATTRIBUTE_UNUSED
)
761 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
762 && TREE_CODE (decl
) == STRING_CST
763 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
765 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
766 && TREE_STRING_LENGTH (decl
) >= len
)
768 enum machine_mode mode
;
769 unsigned int modesize
;
773 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
774 char *name
= (char *) alloca (strlen (prefix
) + 30);
776 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
777 modesize
= GET_MODE_BITSIZE (mode
);
778 if (modesize
>= 8 && modesize
<= 256
779 && (modesize
& (modesize
- 1)) == 0)
781 if (align
< modesize
)
784 str
= TREE_STRING_POINTER (decl
);
785 unit
= GET_MODE_SIZE (mode
);
787 /* Check for embedded NUL characters. */
788 for (i
= 0; i
< len
; i
+= unit
)
790 for (j
= 0; j
< unit
; j
++)
791 if (str
[i
+ j
] != '\0')
798 sprintf (name
, "%s.str%d.%d", prefix
,
799 modesize
/ 8, (int) (align
/ 8));
800 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
801 return get_section (name
, flags
, NULL
);
806 return readonly_data_section
;
809 /* Return the section to use for constant merging. */
812 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
813 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
814 unsigned int flags ATTRIBUTE_UNUSED
)
816 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
818 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
824 && (align
& (align
- 1)) == 0)
826 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
827 char *name
= (char *) alloca (strlen (prefix
) + 30);
829 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
830 flags
|= (align
/ 8) | SECTION_MERGE
;
831 return get_section (name
, flags
, NULL
);
833 return readonly_data_section
;
836 /* Given NAME, a putative register name, discard any customary prefixes. */
839 strip_reg_name (const char *name
)
841 #ifdef REGISTER_PREFIX
842 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
843 name
+= strlen (REGISTER_PREFIX
);
845 if (name
[0] == '%' || name
[0] == '#')
850 /* The user has asked for a DECL to have a particular name. Set (or
851 change) it in such a way that we don't prefix an underscore to
854 set_user_assembler_name (tree decl
, const char *name
)
856 char *starred
= (char *) alloca (strlen (name
) + 2);
858 strcpy (starred
+ 1, name
);
859 symtab
->change_decl_assembler_name (decl
, get_identifier (starred
));
860 SET_DECL_RTL (decl
, NULL_RTX
);
863 /* Decode an `asm' spec for a declaration as a register name.
864 Return the register number, or -1 if nothing specified,
865 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
866 or -3 if ASMSPEC is `cc' and is not recognized,
867 or -4 if ASMSPEC is `memory' and is not recognized.
868 Accept an exact spelling or a decimal number.
869 Prefixes such as % are optional. */
872 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
874 /* Presume just one register is clobbered. */
881 /* Get rid of confusing prefixes. */
882 asmspec
= strip_reg_name (asmspec
);
884 /* Allow a decimal number as a "register name". */
885 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
886 if (! ISDIGIT (asmspec
[i
]))
888 if (asmspec
[0] != 0 && i
< 0)
891 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0)
897 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
899 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
902 #ifdef OVERLAPPING_REGISTER_NAMES
906 const char *const name
;
909 } table
[] = OVERLAPPING_REGISTER_NAMES
;
911 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
913 && ! strcmp (asmspec
, table
[i
].name
))
915 *pnregs
= table
[i
].nregs
;
916 return table
[i
].number
;
919 #endif /* OVERLAPPING_REGISTER_NAMES */
921 #ifdef ADDITIONAL_REGISTER_NAMES
923 static const struct { const char *const name
; const int number
; } table
[]
924 = ADDITIONAL_REGISTER_NAMES
;
926 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
928 && ! strcmp (asmspec
, table
[i
].name
))
929 return table
[i
].number
;
931 #endif /* ADDITIONAL_REGISTER_NAMES */
933 if (!strcmp (asmspec
, "memory"))
936 if (!strcmp (asmspec
, "cc"))
946 decode_reg_name (const char *name
)
949 return decode_reg_name_and_count (name
, &count
);
953 /* Return true if DECL's initializer is suitable for a BSS section. */
956 bss_initializer_p (const_tree decl
)
958 return (DECL_INITIAL (decl
) == NULL
959 /* In LTO we have no errors in program; error_mark_node is used
960 to mark offlined constructors. */
961 || (DECL_INITIAL (decl
) == error_mark_node
963 || (flag_zero_initialized_in_bss
964 /* Leave constant zeroes in .rodata so they
966 && !TREE_READONLY (decl
)
967 && initializer_zerop (DECL_INITIAL (decl
))));
970 /* Compute the alignment of variable specified by DECL.
971 DONT_OUTPUT_DATA is from assemble_variable. */
974 align_variable (tree decl
, bool dont_output_data
)
976 unsigned int align
= DECL_ALIGN (decl
);
978 /* In the case for initialing an array whose length isn't specified,
979 where we have not yet been able to do the layout,
980 figure out the proper alignment now. */
981 if (dont_output_data
&& DECL_SIZE (decl
) == 0
982 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
983 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
985 /* Some object file formats have a maximum alignment which they support.
986 In particular, a.out format supports a maximum alignment of 4. */
987 if (align
> MAX_OFILE_ALIGNMENT
)
989 error ("alignment of %q+D is greater than maximum object "
990 "file alignment %d", decl
,
991 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
992 align
= MAX_OFILE_ALIGNMENT
;
995 if (! DECL_USER_ALIGN (decl
))
997 #ifdef DATA_ABI_ALIGNMENT
998 unsigned int data_abi_align
999 = DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1000 /* For backwards compatibility, don't assume the ABI alignment for
1002 if (! DECL_THREAD_LOCAL_P (decl
) || data_abi_align
<= BITS_PER_WORD
)
1003 align
= data_abi_align
;
1006 /* On some machines, it is good to increase alignment sometimes.
1007 But as DECL_ALIGN is used both for actually emitting the variable
1008 and for code accessing the variable as guaranteed alignment, we
1009 can only increase the alignment if it is a performance optimization
1010 if the references to it must bind to the current definition. */
1011 if (decl_binds_to_current_def_p (decl
)
1012 && !DECL_VIRTUAL_P (decl
))
1014 #ifdef DATA_ALIGNMENT
1015 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1016 /* Don't increase alignment too much for TLS variables - TLS space
1018 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1021 #ifdef CONSTANT_ALIGNMENT
1022 if (DECL_INITIAL (decl
) != 0
1023 /* In LTO we have no errors in program; error_mark_node is used
1024 to mark offlined constructors. */
1025 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1027 unsigned int const_align
1028 = CONSTANT_ALIGNMENT (DECL_INITIAL (decl
), align
);
1029 /* Don't increase alignment too much for TLS variables - TLS
1030 space is too precious. */
1031 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1032 align
= const_align
;
1038 /* Reset the alignment in case we have made it tighter, so we can benefit
1039 from it in get_pointer_alignment. */
1040 DECL_ALIGN (decl
) = align
;
1043 /* Return DECL_ALIGN (decl), possibly increased for optimization purposes
1044 beyond what align_variable returned. */
1047 get_variable_align (tree decl
)
1049 unsigned int align
= DECL_ALIGN (decl
);
1051 /* For user aligned vars or static vars align_variable already did
1053 if (DECL_USER_ALIGN (decl
) || !TREE_PUBLIC (decl
))
1056 #ifdef DATA_ABI_ALIGNMENT
1057 if (DECL_THREAD_LOCAL_P (decl
))
1058 align
= DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1061 /* For decls that bind to the current definition, align_variable
1062 did also everything, except for not assuming ABI required alignment
1063 of TLS variables. For other vars, increase the alignment here
1064 as an optimization. */
1065 if (!decl_binds_to_current_def_p (decl
))
1067 /* On some machines, it is good to increase alignment sometimes. */
1068 #ifdef DATA_ALIGNMENT
1069 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1070 /* Don't increase alignment too much for TLS variables - TLS space
1072 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1075 #ifdef CONSTANT_ALIGNMENT
1076 if (DECL_INITIAL (decl
) != 0
1077 /* In LTO we have no errors in program; error_mark_node is used
1078 to mark offlined constructors. */
1079 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1081 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
1083 /* Don't increase alignment too much for TLS variables - TLS space
1085 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1086 align
= const_align
;
1094 /* Return the section into which the given VAR_DECL or CONST_DECL
1095 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1096 section should be used wherever possible. */
1099 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1101 addr_space_t as
= ADDR_SPACE_GENERIC
;
1103 varpool_node
*vnode
= varpool_node::get (decl
);
1106 vnode
= vnode
->ultimate_alias_target ();
1110 if (TREE_TYPE (decl
) != error_mark_node
)
1111 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1113 /* We need the constructor to figure out reloc flag. */
1115 vnode
->get_constructor ();
1117 if (DECL_COMMON (decl
))
1119 /* If the decl has been given an explicit section name, or it resides
1120 in a non-generic address space, then it isn't common, and shouldn't
1121 be handled as such. */
1122 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1123 && ADDR_SPACE_GENERIC_P (as
));
1124 if (DECL_THREAD_LOCAL_P (decl
))
1125 return tls_comm_section
;
1126 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1127 return comm_section
;
1130 if (DECL_INITIAL (decl
) == error_mark_node
)
1131 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1132 else if (DECL_INITIAL (decl
))
1133 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1137 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1138 if (IN_NAMED_SECTION (decl
))
1139 return get_named_section (decl
, NULL
, reloc
);
1141 if (ADDR_SPACE_GENERIC_P (as
)
1142 && !DECL_THREAD_LOCAL_P (decl
)
1143 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1144 && bss_initializer_p (decl
))
1146 if (!TREE_PUBLIC (decl
)
1147 && !((flag_sanitize
& SANITIZE_ADDRESS
)
1148 && asan_protect_global (decl
)))
1149 return lcomm_section
;
1150 if (bss_noswitch_section
)
1151 return bss_noswitch_section
;
1154 return targetm
.asm_out
.select_section (decl
, reloc
,
1155 get_variable_align (decl
));
1158 /* Return the block into which object_block DECL should be placed. */
1160 static struct object_block
*
1161 get_block_for_decl (tree decl
)
1165 if (TREE_CODE (decl
) == VAR_DECL
)
1167 /* The object must be defined in this translation unit. */
1168 if (DECL_EXTERNAL (decl
))
1171 /* There's no point using object blocks for something that is
1172 isolated by definition. */
1173 if (DECL_COMDAT_GROUP (decl
))
1177 /* We can only calculate block offsets if the decl has a known
1179 if (DECL_SIZE_UNIT (decl
) == NULL
)
1181 if (!tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
)))
1184 /* Find out which section should contain DECL. We cannot put it into
1185 an object block if it requires a standalone definition. */
1186 if (TREE_CODE (decl
) == VAR_DECL
)
1187 align_variable (decl
, 0);
1188 sect
= get_variable_section (decl
, true);
1189 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1192 return get_block_for_section (sect
);
1195 /* Make sure block symbol SYMBOL is in block BLOCK. */
1198 change_symbol_block (rtx symbol
, struct object_block
*block
)
1200 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1202 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1203 SYMBOL_REF_BLOCK (symbol
) = block
;
1207 /* Return true if it is possible to put DECL in an object_block. */
1210 use_blocks_for_decl_p (tree decl
)
1212 struct symtab_node
*snode
;
1214 /* Only data DECLs can be placed into object blocks. */
1215 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1218 /* Detect decls created by dw2_force_const_mem. Such decls are
1219 special because DECL_INITIAL doesn't specify the decl's true value.
1220 dw2_output_indirect_constants will instead call assemble_variable
1221 with dont_output_data set to 1 and then print the contents itself. */
1222 if (DECL_INITIAL (decl
) == decl
)
1225 /* If this decl is an alias, then we don't want to emit a
1227 if (TREE_CODE (decl
) == VAR_DECL
1228 && (snode
= symtab_node::get (decl
)) != NULL
1232 return targetm
.use_blocks_for_decl_p (decl
);
1235 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1236 have static storage duration. In other words, it should not be an
1237 automatic variable, including PARM_DECLs.
1239 There is, however, one exception: this function handles variables
1240 explicitly placed in a particular register by the user.
1242 This is never called for PARM_DECL nodes. */
1245 make_decl_rtl (tree decl
)
1247 const char *name
= 0;
1251 /* Check that we are not being given an automatic variable. */
1252 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1253 && TREE_CODE (decl
) != RESULT_DECL
);
1255 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1256 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1257 || TREE_STATIC (decl
)
1258 || TREE_PUBLIC (decl
)
1259 || DECL_EXTERNAL (decl
)
1260 || DECL_REGISTER (decl
));
1262 /* And that we were not given a type or a label. */
1263 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1264 && TREE_CODE (decl
) != LABEL_DECL
);
1266 /* For a duplicate declaration, we can be called twice on the
1267 same DECL node. Don't discard the RTL already made. */
1268 if (DECL_RTL_SET_P (decl
))
1270 /* If the old RTL had the wrong mode, fix the mode. */
1271 x
= DECL_RTL (decl
);
1272 if (GET_MODE (x
) != DECL_MODE (decl
))
1273 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1275 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1278 /* ??? Another way to do this would be to maintain a hashed
1279 table of such critters. Instead of adding stuff to a DECL
1280 to give certain attributes to it, we could use an external
1281 hash map from DECL to set of attributes. */
1283 /* Let the target reassign the RTL if it wants.
1284 This is necessary, for example, when one machine specific
1285 decl attribute overrides another. */
1286 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1288 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1289 on the new decl information. */
1291 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1292 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1293 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1298 /* If this variable belongs to the global constant pool, retrieve the
1299 pre-computed RTL or recompute it in LTO mode. */
1300 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_IN_CONSTANT_POOL (decl
))
1302 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1306 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
1308 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1309 && DECL_REGISTER (decl
))
1311 error ("register name not specified for %q+D", decl
);
1313 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1315 const char *asmspec
= name
+1;
1316 enum machine_mode mode
= DECL_MODE (decl
);
1317 reg_number
= decode_reg_name (asmspec
);
1318 /* First detect errors in declaring global registers. */
1319 if (reg_number
== -1)
1320 error ("register name not specified for %q+D", decl
);
1321 else if (reg_number
< 0)
1322 error ("invalid register name for %q+D", decl
);
1323 else if (mode
== BLKmode
)
1324 error ("data type of %q+D isn%'t suitable for a register",
1326 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1327 error ("the register specified for %q+D cannot be accessed"
1328 " by the current target", decl
);
1329 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1330 error ("the register specified for %q+D is not general enough"
1331 " to be used as a register variable", decl
);
1332 else if (!HARD_REGNO_MODE_OK (reg_number
, mode
))
1333 error ("register specified for %q+D isn%'t suitable for data type",
1335 /* Now handle properly declared static register variables. */
1340 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1342 DECL_INITIAL (decl
) = 0;
1343 error ("global register variable has initial value");
1345 if (TREE_THIS_VOLATILE (decl
))
1346 warning (OPT_Wvolatile_register_var
,
1347 "optimization may eliminate reads and/or "
1348 "writes to register variables");
1350 /* If the user specified one of the eliminables registers here,
1351 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1352 confused with that register and be eliminated. This usage is
1353 somewhat suspect... */
1355 SET_DECL_RTL (decl
, gen_rtx_raw_REG (mode
, reg_number
));
1356 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1357 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1359 if (TREE_STATIC (decl
))
1361 /* Make this register global, so not usable for anything
1363 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1364 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1365 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1367 nregs
= hard_regno_nregs
[reg_number
][mode
];
1369 globalize_reg (decl
, reg_number
+ --nregs
);
1372 /* As a register variable, it has no section. */
1375 /* Avoid internal errors from invalid register
1377 SET_DECL_ASSEMBLER_NAME (decl
, NULL_TREE
);
1378 DECL_HARD_REGISTER (decl
) = 0;
1381 /* Now handle ordinary static variables and functions (in memory).
1382 Also handle vars declared register invalidly. */
1383 else if (name
[0] == '*')
1385 #ifdef REGISTER_PREFIX
1386 if (strlen (REGISTER_PREFIX
) != 0)
1388 reg_number
= decode_reg_name (name
);
1389 if (reg_number
>= 0 || reg_number
== -3)
1390 error ("register name given for non-register variable %q+D", decl
);
1395 /* Specifying a section attribute on a variable forces it into a
1396 non-.bss section, and thus it cannot be common. */
1397 /* FIXME: In general this code should not be necessary because
1398 visibility pass is doing the same work. But notice_global_symbol
1399 is called early and it needs to make DECL_RTL to get the name.
1400 we take care of recomputing the DECL_RTL after visibility is changed. */
1401 if (TREE_CODE (decl
) == VAR_DECL
1402 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
))
1403 && DECL_SECTION_NAME (decl
) != NULL
1404 && DECL_INITIAL (decl
) == NULL_TREE
1405 && DECL_COMMON (decl
))
1406 DECL_COMMON (decl
) = 0;
1408 /* Variables can't be both common and weak. */
1409 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1410 DECL_COMMON (decl
) = 0;
1412 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1413 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1416 enum machine_mode address_mode
= Pmode
;
1417 if (TREE_TYPE (decl
) != error_mark_node
)
1419 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1420 address_mode
= targetm
.addr_space
.address_mode (as
);
1422 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1424 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1425 SET_SYMBOL_REF_DECL (x
, decl
);
1427 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1428 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1429 set_mem_attributes (x
, decl
, 1);
1430 SET_DECL_RTL (decl
, x
);
1432 /* Optionally set flags or add text to the name to record information
1433 such as that it is a function name.
1434 If the name is changed, the macro ASM_OUTPUT_LABELREF
1435 will have to know how to strip this information. */
1436 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1439 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1440 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1444 make_decl_rtl_for_debug (tree decl
)
1446 unsigned int save_aliasing_flag
;
1449 if (DECL_RTL_SET_P (decl
))
1450 return DECL_RTL (decl
);
1452 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1453 call new_alias_set. If running with -fcompare-debug, sometimes
1454 we do not want to create alias sets that will throw the alias
1455 numbers off in the comparison dumps. So... clearing
1456 flag_strict_aliasing will keep new_alias_set() from creating a
1458 save_aliasing_flag
= flag_strict_aliasing
;
1459 flag_strict_aliasing
= 0;
1461 rtl
= DECL_RTL (decl
);
1462 /* Reset DECL_RTL back, as various parts of the compiler expects
1463 DECL_RTL set meaning it is actually going to be output. */
1464 SET_DECL_RTL (decl
, NULL
);
1466 flag_strict_aliasing
= save_aliasing_flag
;
1470 /* Output a string of literal assembler code
1471 for an `asm' keyword used between functions. */
1474 assemble_asm (tree string
)
1479 if (TREE_CODE (string
) == ADDR_EXPR
)
1480 string
= TREE_OPERAND (string
, 0);
1482 p
= TREE_STRING_POINTER (string
);
1483 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1486 /* Write the address of the entity given by SYMBOL to SEC. */
1488 assemble_addr_to_section (rtx symbol
, section
*sec
)
1490 switch_to_section (sec
);
1491 assemble_align (POINTER_SIZE
);
1492 assemble_integer (symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1495 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1496 not) section for PRIORITY. */
1498 get_cdtor_priority_section (int priority
, bool constructor_p
)
1502 /* ??? This only works reliably with the GNU linker. */
1503 sprintf (buf
, "%s.%.5u",
1504 constructor_p
? ".ctors" : ".dtors",
1505 /* Invert the numbering so the linker puts us in the proper
1506 order; constructors are run from right to left, and the
1507 linker sorts in increasing order. */
1508 MAX_INIT_PRIORITY
- priority
);
1509 return get_section (buf
, SECTION_WRITE
, NULL
);
1513 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1517 if (priority
!= DEFAULT_INIT_PRIORITY
)
1518 sec
= get_cdtor_priority_section (priority
,
1519 /*constructor_p=*/false);
1521 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1523 assemble_addr_to_section (symbol
, sec
);
1526 #ifdef DTORS_SECTION_ASM_OP
1528 default_dtor_section_asm_out_destructor (rtx symbol
,
1529 int priority ATTRIBUTE_UNUSED
)
1531 assemble_addr_to_section (symbol
, dtors_section
);
1536 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1540 if (priority
!= DEFAULT_INIT_PRIORITY
)
1541 sec
= get_cdtor_priority_section (priority
,
1542 /*constructor_p=*/true);
1544 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1546 assemble_addr_to_section (symbol
, sec
);
1549 #ifdef CTORS_SECTION_ASM_OP
1551 default_ctor_section_asm_out_constructor (rtx symbol
,
1552 int priority ATTRIBUTE_UNUSED
)
1554 assemble_addr_to_section (symbol
, ctors_section
);
1558 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1559 a nonzero value if the constant pool should be output before the
1560 start of the function, or a zero value if the pool should output
1561 after the end of the function. The default is to put it before the
1564 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1565 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1568 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1569 to be output to assembler.
1570 Set first_global_object_name and weak_global_object_name as appropriate. */
1573 notice_global_symbol (tree decl
)
1575 const char **type
= &first_global_object_name
;
1577 if (first_global_object_name
1578 || !TREE_PUBLIC (decl
)
1579 || DECL_EXTERNAL (decl
)
1580 || !DECL_NAME (decl
)
1581 || (TREE_CODE (decl
) != FUNCTION_DECL
1582 && (TREE_CODE (decl
) != VAR_DECL
1583 || (DECL_COMMON (decl
)
1584 && (DECL_INITIAL (decl
) == 0
1585 || DECL_INITIAL (decl
) == error_mark_node
))))
1586 || !MEM_P (DECL_RTL (decl
)))
1589 /* We win when global object is found, but it is useful to know about weak
1590 symbol as well so we can produce nicer unique names. */
1591 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1592 type
= &weak_global_object_name
;
1598 rtx decl_rtl
= DECL_RTL (decl
);
1600 p
= targetm
.strip_name_encoding (XSTR (XEXP (decl_rtl
, 0), 0));
1601 name
= ggc_strdup (p
);
1607 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1608 current function goes into the cold section, so that targets can use
1609 current_function_section during RTL expansion. DECL describes the
1613 decide_function_section (tree decl
)
1615 first_function_block_is_cold
= false;
1617 if (flag_reorder_blocks_and_partition
)
1618 /* We will decide in assemble_start_function. */
1621 if (DECL_SECTION_NAME (decl
))
1623 struct cgraph_node
*node
= cgraph_node::get (current_function_decl
);
1624 /* Calls to function_section rely on first_function_block_is_cold
1626 first_function_block_is_cold
= (node
1628 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1631 in_cold_section_p
= first_function_block_is_cold
;
1634 /* Output assembler code for the constant pool of a function and associated
1635 with defining the name of the function. DECL describes the function.
1636 NAME is the function's name. For the constant pool, we use the current
1637 constant pool data. */
1640 assemble_start_function (tree decl
, const char *fnname
)
1643 char tmp_label
[100];
1644 bool hot_label_written
= false;
1646 if (flag_reorder_blocks_and_partition
)
1648 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1649 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1650 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1651 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1652 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1653 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1654 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1655 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1660 crtl
->subsections
.hot_section_label
= NULL
;
1661 crtl
->subsections
.cold_section_label
= NULL
;
1662 crtl
->subsections
.hot_section_end_label
= NULL
;
1663 crtl
->subsections
.cold_section_end_label
= NULL
;
1666 /* The following code does not need preprocessing in the assembler. */
1670 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1671 output_constant_pool (fnname
, decl
);
1673 /* Make sure the not and cold text (code) sections are properly
1674 aligned. This is necessary here in the case where the function
1675 has both hot and cold sections, because we don't want to re-set
1676 the alignment when the section switch happens mid-function. */
1678 if (flag_reorder_blocks_and_partition
)
1680 first_function_block_is_cold
= false;
1682 switch_to_section (unlikely_text_section ());
1683 assemble_align (DECL_ALIGN (decl
));
1684 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1686 /* When the function starts with a cold section, we need to explicitly
1687 align the hot section and write out the hot section label.
1688 But if the current function is a thunk, we do not have a CFG. */
1690 && BB_PARTITION (ENTRY_BLOCK_PTR_FOR_FN (cfun
)->next_bb
) == BB_COLD_PARTITION
)
1692 switch_to_section (text_section
);
1693 assemble_align (DECL_ALIGN (decl
));
1694 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1695 hot_label_written
= true;
1696 first_function_block_is_cold
= true;
1698 in_cold_section_p
= first_function_block_is_cold
;
1702 /* Switch to the correct text section for the start of the function. */
1704 switch_to_section (function_section (decl
));
1705 if (flag_reorder_blocks_and_partition
1706 && !hot_label_written
)
1707 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1709 /* Tell assembler to move to target machine's alignment for functions. */
1710 align
= floor_log2 (DECL_ALIGN (decl
) / BITS_PER_UNIT
);
1713 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1716 /* Handle a user-specified function alignment.
1717 Note that we still need to align to DECL_ALIGN, as above,
1718 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1719 if (! DECL_USER_ALIGN (decl
)
1720 && align_functions_log
> align
1721 && optimize_function_for_speed_p (cfun
))
1723 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1724 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1725 align_functions_log
, align_functions
- 1);
1727 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1731 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1732 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1735 if (!DECL_IGNORED_P (decl
))
1736 (*debug_hooks
->begin_function
) (decl
);
1738 /* Make function name accessible from other files, if appropriate. */
1740 if (TREE_PUBLIC (decl
))
1742 notice_global_symbol (decl
);
1744 globalize_decl (decl
);
1746 maybe_assemble_visibility (decl
);
1749 if (DECL_PRESERVE_P (decl
))
1750 targetm
.asm_out
.mark_decl_preserved (fnname
);
1752 /* Do any machine/system dependent processing of the function name. */
1753 #ifdef ASM_DECLARE_FUNCTION_NAME
1754 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1756 /* Standard thing is just output label for the function. */
1757 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1758 #endif /* ASM_DECLARE_FUNCTION_NAME */
1760 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1761 saw_no_split_stack
= true;
1764 /* Output assembler code associated with defining the size of the
1765 function. DECL describes the function. NAME is the function's name. */
1768 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1770 #ifdef ASM_DECLARE_FUNCTION_SIZE
1771 /* We could have switched section in the middle of the function. */
1772 if (flag_reorder_blocks_and_partition
)
1773 switch_to_section (function_section (decl
));
1774 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1776 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1778 output_constant_pool (fnname
, decl
);
1779 switch_to_section (function_section (decl
)); /* need to switch back */
1781 /* Output labels for end of hot/cold text sections (to be used by
1783 if (flag_reorder_blocks_and_partition
)
1785 section
*save_text_section
;
1787 save_text_section
= in_section
;
1788 switch_to_section (unlikely_text_section ());
1789 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1790 if (first_function_block_is_cold
)
1791 switch_to_section (text_section
);
1793 switch_to_section (function_section (decl
));
1794 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1795 switch_to_section (save_text_section
);
1799 /* Assemble code to leave SIZE bytes of zeros. */
1802 assemble_zeros (unsigned HOST_WIDE_INT size
)
1804 /* Do no output if -fsyntax-only. */
1805 if (flag_syntax_only
)
1808 #ifdef ASM_NO_SKIP_IN_TEXT
1809 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1810 so we must output 0s explicitly in the text section. */
1811 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1813 unsigned HOST_WIDE_INT i
;
1814 for (i
= 0; i
< size
; i
++)
1815 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1820 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1823 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1826 assemble_align (int align
)
1828 if (align
> BITS_PER_UNIT
)
1830 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1834 /* Assemble a string constant with the specified C string as contents. */
1837 assemble_string (const char *p
, int size
)
1842 /* If the string is very long, split it up. */
1846 int thissize
= size
- pos
;
1847 if (thissize
> maximum
)
1850 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1858 /* A noswitch_section_callback for lcomm_section. */
1861 emit_local (tree decl ATTRIBUTE_UNUSED
,
1862 const char *name ATTRIBUTE_UNUSED
,
1863 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1864 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1866 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1867 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1868 size
, DECL_ALIGN (decl
));
1870 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1871 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1874 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1879 /* A noswitch_section_callback for bss_noswitch_section. */
1881 #if defined ASM_OUTPUT_ALIGNED_BSS
1883 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1884 const char *name ATTRIBUTE_UNUSED
,
1885 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1886 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1888 #if defined ASM_OUTPUT_ALIGNED_BSS
1889 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
,
1890 get_variable_align (decl
));
1896 /* A noswitch_section_callback for comm_section. */
1899 emit_common (tree decl ATTRIBUTE_UNUSED
,
1900 const char *name ATTRIBUTE_UNUSED
,
1901 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1902 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1904 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1905 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1906 size
, get_variable_align (decl
));
1908 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1909 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
,
1910 get_variable_align (decl
));
1913 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1918 /* A noswitch_section_callback for tls_comm_section. */
1921 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1922 const char *name ATTRIBUTE_UNUSED
,
1923 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1924 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1926 #ifdef ASM_OUTPUT_TLS_COMMON
1927 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
1930 sorry ("thread-local COMMON data not implemented");
1935 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1936 NAME is the name of DECL's SYMBOL_REF. */
1939 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
,
1942 unsigned HOST_WIDE_INT size
, rounded
;
1944 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
1947 if ((flag_sanitize
& SANITIZE_ADDRESS
) && asan_protect_global (decl
))
1948 size
+= asan_red_zone_size (size
);
1950 /* Don't allocate zero bytes of common,
1951 since that means "undefined external" in the linker. */
1955 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1956 so that each uninitialized object starts on such a boundary. */
1957 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
1958 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
1959 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
1961 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
1962 && (unsigned HOST_WIDE_INT
) (align
/ BITS_PER_UNIT
) > rounded
)
1963 error ("requested alignment for %q+D is greater than "
1964 "implemented alignment of %wu", decl
, rounded
);
1967 /* A subroutine of assemble_variable. Output the label and contents of
1968 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1969 is as for assemble_variable. */
1972 assemble_variable_contents (tree decl
, const char *name
,
1973 bool dont_output_data
)
1975 /* Do any machine/system dependent processing of the object. */
1976 #ifdef ASM_DECLARE_OBJECT_NAME
1977 last_assemble_variable_decl
= decl
;
1978 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
1980 /* Standard thing is just output label for the object. */
1981 ASM_OUTPUT_LABEL (asm_out_file
, name
);
1982 #endif /* ASM_DECLARE_OBJECT_NAME */
1984 if (!dont_output_data
)
1986 /* Caller is supposed to use varpool_get_constructor when it wants
1987 to output the body. */
1988 gcc_assert (!in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
);
1989 if (DECL_INITIAL (decl
)
1990 && DECL_INITIAL (decl
) != error_mark_node
1991 && !initializer_zerop (DECL_INITIAL (decl
)))
1992 /* Output the actual data. */
1993 output_constant (DECL_INITIAL (decl
),
1994 tree_to_uhwi (DECL_SIZE_UNIT (decl
)),
1995 get_variable_align (decl
));
1997 /* Leave space for it. */
1998 assemble_zeros (tree_to_uhwi (DECL_SIZE_UNIT (decl
)));
2002 /* Assemble everything that is needed for a variable or function declaration.
2003 Not used for automatic variables, and not used for function definitions.
2004 Should not be called for variables of incomplete structure type.
2006 TOP_LEVEL is nonzero if this variable has file scope.
2007 AT_END is nonzero if this is the special handling, at end of compilation,
2008 to define things that have had only tentative definitions.
2009 DONT_OUTPUT_DATA if nonzero means don't actually output the
2010 initial value (that will be done by the caller). */
2013 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
2014 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
2017 rtx decl_rtl
, symbol
;
2020 bool asan_protected
= false;
2022 /* This function is supposed to handle VARIABLES. Ensure we have one. */
2023 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
2025 /* Emulated TLS had better not get this far. */
2026 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
2028 last_assemble_variable_decl
= 0;
2030 /* Normally no need to say anything here for external references,
2031 since assemble_external is called by the language-specific code
2032 when a declaration is first seen. */
2034 if (DECL_EXTERNAL (decl
))
2037 /* Do nothing for global register variables. */
2038 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
2040 TREE_ASM_WRITTEN (decl
) = 1;
2044 /* If type was incomplete when the variable was declared,
2045 see if it is complete now. */
2047 if (DECL_SIZE (decl
) == 0)
2048 layout_decl (decl
, 0);
2050 /* Still incomplete => don't allocate it; treat the tentative defn
2051 (which is what it must have been) as an `extern' reference. */
2053 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2055 error ("storage size of %q+D isn%'t known", decl
);
2056 TREE_ASM_WRITTEN (decl
) = 1;
2060 /* The first declaration of a variable that comes through this function
2061 decides whether it is global (in C, has external linkage)
2062 or local (in C, has internal linkage). So do nothing more
2063 if this function has already run. */
2065 if (TREE_ASM_WRITTEN (decl
))
2068 /* Make sure targetm.encode_section_info is invoked before we set
2070 decl_rtl
= DECL_RTL (decl
);
2072 TREE_ASM_WRITTEN (decl
) = 1;
2074 /* Do no output if -fsyntax-only. */
2075 if (flag_syntax_only
)
2078 if (! dont_output_data
2079 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
2081 error ("size of variable %q+D is too large", decl
);
2085 gcc_assert (MEM_P (decl_rtl
));
2086 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2087 symbol
= XEXP (decl_rtl
, 0);
2089 /* If this symbol belongs to the tree constant pool, output the constant
2090 if it hasn't already been written. */
2091 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
2093 tree decl
= SYMBOL_REF_DECL (symbol
);
2094 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
2095 output_constant_def_contents (symbol
);
2101 name
= XSTR (symbol
, 0);
2102 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2103 notice_global_symbol (decl
);
2105 /* Compute the alignment of this data. */
2107 align_variable (decl
, dont_output_data
);
2109 if ((flag_sanitize
& SANITIZE_ADDRESS
)
2110 && asan_protect_global (decl
))
2112 asan_protected
= true;
2113 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
2114 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
2117 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2119 align
= get_variable_align (decl
);
2121 if (TREE_PUBLIC (decl
))
2122 maybe_assemble_visibility (decl
);
2124 if (DECL_PRESERVE_P (decl
))
2125 targetm
.asm_out
.mark_decl_preserved (name
);
2127 /* First make the assembler name(s) global if appropriate. */
2128 sect
= get_variable_section (decl
, false);
2129 if (TREE_PUBLIC (decl
)
2130 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2131 globalize_decl (decl
);
2133 /* Output any data that we will need to use the address of. */
2134 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2135 output_addressed_constants (DECL_INITIAL (decl
));
2137 /* dbxout.c needs to know this. */
2138 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2139 DECL_IN_TEXT_SECTION (decl
) = 1;
2141 /* If the decl is part of an object_block, make sure that the decl
2142 has been positioned within its block, but do not write out its
2143 definition yet. output_object_blocks will do that later. */
2144 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2146 gcc_assert (!dont_output_data
);
2147 place_block_symbol (symbol
);
2149 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2150 assemble_noswitch_variable (decl
, name
, sect
, align
);
2153 /* The following bit of code ensures that vtable_map
2154 variables are not only in the comdat section, but that
2155 each variable has its own unique comdat name. If this
2156 code is removed, the variables end up in the same section
2157 with a single comdat name.
2159 FIXME: resolve_unique_section needs to deal better with
2160 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
2161 that is fixed, this if-else statement can be replaced with
2162 a single call to "switch_to_section (sect)". */
2163 if (sect
->named
.name
2164 && (strcmp (sect
->named
.name
, ".vtable_map_vars") == 0))
2166 #if defined (OBJECT_FORMAT_ELF)
2167 targetm
.asm_out
.named_section (sect
->named
.name
,
2168 sect
->named
.common
.flags
2173 switch_to_section (sect
);
2177 switch_to_section (sect
);
2178 if (align
> BITS_PER_UNIT
)
2179 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
2180 assemble_variable_contents (decl
, name
, dont_output_data
);
2183 unsigned HOST_WIDE_INT
int size
2184 = tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2185 assemble_zeros (asan_red_zone_size (size
));
2191 /* Given a function declaration (FN_DECL), this function assembles the
2192 function into the .preinit_array section. */
2195 assemble_vtv_preinit_initializer (tree fn_decl
)
2198 unsigned flags
= SECTION_WRITE
;
2199 rtx symbol
= XEXP (DECL_RTL (fn_decl
), 0);
2201 flags
|= SECTION_NOTYPE
;
2202 sect
= get_section (".preinit_array", flags
, fn_decl
);
2203 switch_to_section (sect
);
2204 assemble_addr_to_section (symbol
, sect
);
2207 /* Return 1 if type TYPE contains any pointers. */
2210 contains_pointers_p (tree type
)
2212 switch (TREE_CODE (type
))
2215 case REFERENCE_TYPE
:
2216 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2217 so I'll play safe and return 1. */
2223 case QUAL_UNION_TYPE
:
2226 /* For a type that has fields, see if the fields have pointers. */
2227 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2228 if (TREE_CODE (fields
) == FIELD_DECL
2229 && contains_pointers_p (TREE_TYPE (fields
)))
2235 /* An array type contains pointers if its element type does. */
2236 return contains_pointers_p (TREE_TYPE (type
));
2243 /* We delay assemble_external processing until
2244 the compilation unit is finalized. This is the best we can do for
2245 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2246 it all the way to final. See PR 17982 for further discussion. */
2247 static GTY(()) tree pending_assemble_externals
;
2249 #ifdef ASM_OUTPUT_EXTERNAL
2250 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2251 As a result, assemble_external can be called after the list of externals
2252 is processed and the pointer set destroyed. */
2253 static bool pending_assemble_externals_processed
;
2255 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2256 TREE_LIST in assemble_external. */
2257 static hash_set
<tree
> *pending_assemble_externals_set
;
2259 /* True if DECL is a function decl for which no out-of-line copy exists.
2260 It is assumed that DECL's assembler name has been set. */
2263 incorporeal_function_p (tree decl
)
2265 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2269 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2270 && (DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
2271 || DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA_WITH_ALIGN
))
2274 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2275 /* Atomic or sync builtins which have survived this far will be
2276 resolved externally and therefore are not incorporeal. */
2277 if (strncmp (name
, "__builtin_", 10) == 0)
2283 /* Actually do the tests to determine if this is necessary, and invoke
2284 ASM_OUTPUT_EXTERNAL. */
2286 assemble_external_real (tree decl
)
2288 rtx rtl
= DECL_RTL (decl
);
2290 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2291 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2292 && !incorporeal_function_p (decl
))
2294 /* Some systems do require some output. */
2295 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2296 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2302 process_pending_assemble_externals (void)
2304 #ifdef ASM_OUTPUT_EXTERNAL
2306 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2307 assemble_external_real (TREE_VALUE (list
));
2309 pending_assemble_externals
= 0;
2310 pending_assemble_externals_processed
= true;
2311 delete pending_assemble_externals_set
;
2315 /* This TREE_LIST contains any weak symbol declarations waiting
2317 static GTY(()) tree weak_decls
;
2319 /* Output something to declare an external symbol to the assembler,
2320 and qualifiers such as weakness. (Most assemblers don't need
2321 extern declaration, so we normally output nothing.) Do nothing if
2322 DECL is not external. */
2325 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2327 /* Make sure that the ASM_OUT_FILE is open.
2328 If it's not, we should not be calling this function. */
2329 gcc_assert (asm_out_file
);
2331 /* In a perfect world, the following condition would be true.
2332 Sadly, the Java and Go front ends emit assembly *from the front end*,
2333 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2335 /* This function should only be called if we are expanding, or have
2337 Ideally, only final.c would be calling this function, but it is
2338 not clear whether that would break things somehow. See PR 17982
2339 for further discussion. */
2340 gcc_assert (state
== EXPANSION
2341 || state
== FINISHED
);
2344 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2347 /* We want to output annotation for weak and external symbols at
2348 very last to check if they are references or not. */
2350 if (TARGET_SUPPORTS_WEAK
2352 /* TREE_STATIC is a weird and abused creature which is not
2353 generally the right test for whether an entity has been
2354 locally emitted, inlined or otherwise not-really-extern, but
2355 for declarations that can be weak, it happens to be
2357 && !TREE_STATIC (decl
)
2358 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2359 && value_member (decl
, weak_decls
) == NULL_TREE
)
2360 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2362 #ifdef ASM_OUTPUT_EXTERNAL
2363 if (pending_assemble_externals_processed
)
2365 assemble_external_real (decl
);
2369 if (! pending_assemble_externals_set
->add (decl
))
2370 pending_assemble_externals
= tree_cons (NULL
, decl
,
2371 pending_assemble_externals
);
2375 /* Similar, for calling a library function FUN. */
2378 assemble_external_libcall (rtx fun
)
2380 /* Declare library function name external when first used, if nec. */
2381 if (! SYMBOL_REF_USED (fun
))
2383 SYMBOL_REF_USED (fun
) = 1;
2384 targetm
.asm_out
.external_libcall (fun
);
2388 /* Assemble a label named NAME. */
2391 assemble_label (FILE *file
, const char *name
)
2393 ASM_OUTPUT_LABEL (file
, name
);
2396 /* Set the symbol_referenced flag for ID. */
2398 mark_referenced (tree id
)
2400 TREE_SYMBOL_REFERENCED (id
) = 1;
2403 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2405 mark_decl_referenced (tree decl
)
2407 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2409 /* Extern inline functions don't become needed when referenced.
2410 If we know a method will be emitted in other TU and no new
2411 functions can be marked reachable, just use the external
2413 struct cgraph_node
*node
= cgraph_node::get_create (decl
);
2414 if (!DECL_EXTERNAL (decl
)
2415 && !node
->definition
)
2416 node
->mark_force_output ();
2418 else if (TREE_CODE (decl
) == VAR_DECL
)
2420 varpool_node
*node
= varpool_node::get_create (decl
);
2421 /* C++ frontend use mark_decl_references to force COMDAT variables
2422 to be output that might appear dead otherwise. */
2423 node
->force_output
= true;
2425 /* else do nothing - we can get various sorts of CST nodes here,
2426 which do not need to be marked. */
2430 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2431 until we find an identifier that is not itself a transparent alias.
2432 Modify the alias passed to it by reference (and all aliases on the
2433 way to the ultimate target), such that they do not have to be
2434 followed again, and return the ultimate target of the alias
2438 ultimate_transparent_alias_target (tree
*alias
)
2440 tree target
= *alias
;
2442 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
2444 gcc_assert (TREE_CHAIN (target
));
2445 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
2446 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
2447 && ! TREE_CHAIN (target
));
2454 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2455 starts with a *, the rest of NAME is output verbatim. Otherwise
2456 NAME is transformed in a target-specific way (usually by the
2457 addition of an underscore). */
2460 assemble_name_raw (FILE *file
, const char *name
)
2463 fputs (&name
[1], file
);
2465 ASM_OUTPUT_LABELREF (file
, name
);
2468 /* Like assemble_name_raw, but should be used when NAME might refer to
2469 an entity that is also represented as a tree (like a function or
2470 variable). If NAME does refer to such an entity, that entity will
2471 be marked as referenced. */
2474 assemble_name (FILE *file
, const char *name
)
2476 const char *real_name
;
2479 real_name
= targetm
.strip_name_encoding (name
);
2481 id
= maybe_get_identifier (real_name
);
2486 mark_referenced (id
);
2487 ultimate_transparent_alias_target (&id
);
2489 name
= IDENTIFIER_POINTER (id
);
2490 gcc_assert (! TREE_CHAIN (id
));
2493 assemble_name_raw (file
, name
);
2496 /* Allocate SIZE bytes writable static space with a gensym name
2497 and return an RTX to refer to its address. */
2500 assemble_static_space (unsigned HOST_WIDE_INT size
)
2503 const char *namestring
;
2506 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2508 namestring
= ggc_strdup (name
);
2510 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2511 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2513 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2514 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2517 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2518 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2521 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2522 so that each uninitialized object starts on such a boundary. */
2523 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2524 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2525 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2526 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2527 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2528 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2535 /* Assemble the static constant template for function entry trampolines.
2536 This is done at most once per compilation.
2537 Returns an RTX for the address of the template. */
2539 static GTY(()) rtx initial_trampoline
;
2542 assemble_trampoline_template (void)
2549 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2551 if (initial_trampoline
)
2552 return initial_trampoline
;
2554 /* By default, put trampoline templates in read-only data section. */
2556 #ifdef TRAMPOLINE_SECTION
2557 switch_to_section (TRAMPOLINE_SECTION
);
2559 switch_to_section (readonly_data_section
);
2562 /* Write the assembler code to define one. */
2563 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2565 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2567 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2568 targetm
.asm_out
.trampoline_template (asm_out_file
);
2570 /* Record the rtl to refer to it. */
2571 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2572 name
= ggc_strdup (label
);
2573 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2574 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2576 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2577 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2578 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2580 return initial_trampoline
;
2583 /* A and B are either alignments or offsets. Return the minimum alignment
2584 that may be assumed after adding the two together. */
2586 static inline unsigned
2587 min_align (unsigned int a
, unsigned int b
)
2589 return (a
| b
) & -(a
| b
);
2592 /* Return the assembler directive for creating a given kind of integer
2593 object. SIZE is the number of bytes in the object and ALIGNED_P
2594 indicates whether it is known to be aligned. Return NULL if the
2595 assembly dialect has no such directive.
2597 The returned string should be printed at the start of a new line and
2598 be followed immediately by the object's initial value. */
2601 integer_asm_op (int size
, int aligned_p
)
2603 struct asm_int_op
*ops
;
2606 ops
= &targetm
.asm_out
.aligned_op
;
2608 ops
= &targetm
.asm_out
.unaligned_op
;
2613 return targetm
.asm_out
.byte_op
;
2627 /* Use directive OP to assemble an integer object X. Print OP at the
2628 start of the line, followed immediately by the value of X. */
2631 assemble_integer_with_op (const char *op
, rtx x
)
2633 fputs (op
, asm_out_file
);
2634 output_addr_const (asm_out_file
, x
);
2635 fputc ('\n', asm_out_file
);
2638 /* The default implementation of the asm_out.integer target hook. */
2641 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2642 unsigned int size ATTRIBUTE_UNUSED
,
2643 int aligned_p ATTRIBUTE_UNUSED
)
2645 const char *op
= integer_asm_op (size
, aligned_p
);
2646 /* Avoid GAS bugs for large values. Specifically negative values whose
2647 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2648 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE
/ BITS_PER_UNIT
)
2650 return op
&& (assemble_integer_with_op (op
, x
), true);
2653 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2654 the alignment of the integer in bits. Return 1 if we were able to output
2655 the constant, otherwise 0. We must be able to output the constant,
2656 if FORCE is nonzero. */
2659 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2663 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2665 /* See if the target hook can handle this kind of object. */
2666 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2669 /* If the object is a multi-byte one, try splitting it up. Split
2670 it into words it if is multi-word, otherwise split it into bytes. */
2673 enum machine_mode omode
, imode
;
2674 unsigned int subalign
;
2675 unsigned int subsize
, i
;
2676 enum mode_class mclass
;
2678 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2679 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2680 if (GET_CODE (x
) == CONST_FIXED
)
2681 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2685 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2686 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2688 for (i
= 0; i
< size
; i
+= subsize
)
2690 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2691 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2697 /* If we've printed some of it, but not all of it, there's no going
2702 gcc_assert (!force
);
2708 assemble_real (REAL_VALUE_TYPE d
, enum machine_mode mode
, unsigned int align
)
2710 long data
[4] = {0, 0, 0, 0};
2712 int bitsize
, nelts
, nunits
, units_per
;
2714 /* This is hairy. We have a quantity of known size. real_to_target
2715 will put it into an array of *host* longs, 32 bits per element
2716 (even if long is more than 32 bits). We need to determine the
2717 number of array elements that are occupied (nelts) and the number
2718 of *target* min-addressable units that will be occupied in the
2719 object file (nunits). We cannot assume that 32 divides the
2720 mode's bitsize (size * BITS_PER_UNIT) evenly.
2722 size * BITS_PER_UNIT is used here to make sure that padding bits
2723 (which might appear at either end of the value; real_to_target
2724 will include the padding bits in its output array) are included. */
2726 nunits
= GET_MODE_SIZE (mode
);
2727 bitsize
= nunits
* BITS_PER_UNIT
;
2728 nelts
= CEIL (bitsize
, 32);
2729 units_per
= 32 / BITS_PER_UNIT
;
2731 real_to_target (data
, &d
, mode
);
2733 /* Put out the first word with the specified alignment. */
2734 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2735 nunits
-= units_per
;
2737 /* Subsequent words need only 32-bit alignment. */
2738 align
= min_align (align
, 32);
2740 for (i
= 1; i
< nelts
; i
++)
2742 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2743 nunits
-= units_per
;
2747 /* Given an expression EXP with a constant value,
2748 reduce it to the sum of an assembler symbol and an integer.
2749 Store them both in the structure *VALUE.
2750 EXP must be reducible. */
2754 HOST_WIDE_INT offset
;
2758 decode_addr_const (tree exp
, struct addr_const
*value
)
2760 tree target
= TREE_OPERAND (exp
, 0);
2766 if (TREE_CODE (target
) == COMPONENT_REF
2767 && tree_fits_shwi_p (byte_position (TREE_OPERAND (target
, 1))))
2769 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2770 target
= TREE_OPERAND (target
, 0);
2772 else if (TREE_CODE (target
) == ARRAY_REF
2773 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2775 offset
+= (tree_to_uhwi (TYPE_SIZE_UNIT (TREE_TYPE (target
)))
2776 * tree_to_shwi (TREE_OPERAND (target
, 1)));
2777 target
= TREE_OPERAND (target
, 0);
2779 else if (TREE_CODE (target
) == MEM_REF
2780 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2782 offset
+= mem_ref_offset (target
).to_short_addr ();
2783 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2785 else if (TREE_CODE (target
) == INDIRECT_REF
2786 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2787 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2789 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2794 switch (TREE_CODE (target
))
2798 x
= DECL_RTL (target
);
2802 x
= gen_rtx_MEM (FUNCTION_MODE
,
2803 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2812 x
= output_constant_def (target
, 1);
2819 gcc_assert (MEM_P (x
));
2823 value
->offset
= offset
;
2827 static GTY((param_is (struct constant_descriptor_tree
)))
2828 htab_t const_desc_htab
;
2830 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2832 /* Constant pool accessor function. */
2835 constant_pool_htab (void)
2837 return const_desc_htab
;
2840 /* Compute a hash code for a constant expression. */
2843 const_desc_hash (const void *ptr
)
2845 return ((const struct constant_descriptor_tree
*)ptr
)->hash
;
2849 const_hash_1 (const tree exp
)
2854 enum tree_code code
= TREE_CODE (exp
);
2856 /* Either set P and LEN to the address and len of something to hash and
2857 exit the switch or return a value. */
2862 p
= (char *) &TREE_INT_CST_ELT (exp
, 0);
2863 len
= TREE_INT_CST_NUNITS (exp
) * sizeof (HOST_WIDE_INT
);
2867 return real_hash (TREE_REAL_CST_PTR (exp
));
2870 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2873 p
= TREE_STRING_POINTER (exp
);
2874 len
= TREE_STRING_LENGTH (exp
);
2878 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2879 + const_hash_1 (TREE_IMAGPART (exp
)));
2885 hi
= 7 + VECTOR_CST_NELTS (exp
);
2887 for (i
= 0; i
< VECTOR_CST_NELTS (exp
); ++i
)
2888 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ELT (exp
, i
));
2895 unsigned HOST_WIDE_INT idx
;
2898 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2900 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2902 hi
= hi
* 603 + const_hash_1 (value
);
2910 struct addr_const value
;
2912 decode_addr_const (exp
, &value
);
2913 switch (GET_CODE (value
.base
))
2916 /* Don't hash the address of the SYMBOL_REF;
2917 only use the offset and the symbol name. */
2919 p
= XSTR (value
.base
, 0);
2920 for (i
= 0; p
[i
] != 0; i
++)
2921 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2925 hi
= value
.offset
+ CODE_LABEL_NUMBER (XEXP (value
.base
, 0)) * 13;
2935 case POINTER_PLUS_EXPR
:
2937 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2938 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2941 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2944 /* A language specific constant. Just hash the code. */
2948 /* Compute hashing function. */
2950 for (i
= 0; i
< len
; i
++)
2951 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2956 /* Wrapper of compare_constant, for the htab interface. */
2958 const_desc_eq (const void *p1
, const void *p2
)
2960 const struct constant_descriptor_tree
*const c1
2961 = (const struct constant_descriptor_tree
*) p1
;
2962 const struct constant_descriptor_tree
*const c2
2963 = (const struct constant_descriptor_tree
*) p2
;
2964 if (c1
->hash
!= c2
->hash
)
2966 return compare_constant (c1
->value
, c2
->value
);
2969 /* Compare t1 and t2, and return 1 only if they are known to result in
2970 the same bit pattern on output. */
2973 compare_constant (const tree t1
, const tree t2
)
2975 enum tree_code typecode
;
2977 if (t1
== NULL_TREE
)
2978 return t2
== NULL_TREE
;
2979 if (t2
== NULL_TREE
)
2982 if (TREE_CODE (t1
) != TREE_CODE (t2
))
2985 switch (TREE_CODE (t1
))
2988 /* Integer constants are the same only if the same width of type. */
2989 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2991 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2993 return tree_int_cst_equal (t1
, t2
);
2996 /* Real constants are the same only if the same width of type. */
2997 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3000 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
3003 /* Fixed constants are the same only if the same width of type. */
3004 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3007 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
3010 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3013 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
3014 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
3015 TREE_STRING_LENGTH (t1
)));
3018 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
3019 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
3025 if (VECTOR_CST_NELTS (t1
) != VECTOR_CST_NELTS (t2
))
3028 for (i
= 0; i
< VECTOR_CST_NELTS (t1
); ++i
)
3029 if (!compare_constant (VECTOR_CST_ELT (t1
, i
),
3030 VECTOR_CST_ELT (t2
, i
)))
3038 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
3039 unsigned HOST_WIDE_INT idx
;
3041 typecode
= TREE_CODE (TREE_TYPE (t1
));
3042 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
3045 if (typecode
== ARRAY_TYPE
)
3047 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
3048 /* For arrays, check that the sizes all match. */
3049 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
3051 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
3056 /* For record and union constructors, require exact type
3058 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
3062 v1
= CONSTRUCTOR_ELTS (t1
);
3063 v2
= CONSTRUCTOR_ELTS (t2
);
3064 if (vec_safe_length (v1
) != vec_safe_length (v2
))
3067 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
3069 constructor_elt
*c1
= &(*v1
)[idx
];
3070 constructor_elt
*c2
= &(*v2
)[idx
];
3072 /* Check that each value is the same... */
3073 if (!compare_constant (c1
->value
, c2
->value
))
3075 /* ... and that they apply to the same fields! */
3076 if (typecode
== ARRAY_TYPE
)
3078 if (!compare_constant (c1
->index
, c2
->index
))
3083 if (c1
->index
!= c2
->index
)
3094 struct addr_const value1
, value2
;
3098 decode_addr_const (t1
, &value1
);
3099 decode_addr_const (t2
, &value2
);
3101 if (value1
.offset
!= value2
.offset
)
3104 code
= GET_CODE (value1
.base
);
3105 if (code
!= GET_CODE (value2
.base
))
3111 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3115 ret
= (CODE_LABEL_NUMBER (XEXP (value1
.base
, 0))
3116 == CODE_LABEL_NUMBER (XEXP (value2
.base
, 0)));
3126 case POINTER_PLUS_EXPR
:
3129 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3130 && compare_constant (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3133 case VIEW_CONVERT_EXPR
:
3134 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3143 /* Return the section into which constant EXP should be placed. */
3146 get_constant_section (tree exp
, unsigned int align
)
3148 return targetm
.asm_out
.select_section (exp
,
3149 compute_reloc_for_constant (exp
),
3153 /* Return the size of constant EXP in bytes. */
3155 static HOST_WIDE_INT
3156 get_constant_size (tree exp
)
3160 size
= int_size_in_bytes (TREE_TYPE (exp
));
3161 if (TREE_CODE (exp
) == STRING_CST
)
3162 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3166 /* Subroutine of output_constant_def:
3167 No constant equal to EXP is known to have been output.
3168 Make a constant descriptor to enter EXP in the hash table.
3169 Assign the label number and construct RTL to refer to the
3170 constant's location in memory.
3171 Caller is responsible for updating the hash table. */
3173 static struct constant_descriptor_tree
*
3174 build_constant_desc (tree exp
)
3176 struct constant_descriptor_tree
*desc
;
3182 desc
= ggc_alloc
<constant_descriptor_tree
> ();
3185 /* Create a string containing the label name, in LABEL. */
3186 labelno
= const_labelno
++;
3187 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3189 /* Construct the VAR_DECL associated with the constant. */
3190 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3192 DECL_ARTIFICIAL (decl
) = 1;
3193 DECL_IGNORED_P (decl
) = 1;
3194 TREE_READONLY (decl
) = 1;
3195 TREE_STATIC (decl
) = 1;
3196 TREE_ADDRESSABLE (decl
) = 1;
3197 /* We don't set the RTL yet as this would cause varpool to assume that the
3198 variable is referenced. Moreover, it would just be dropped in LTO mode.
3199 Instead we set the flag that will be recognized in make_decl_rtl. */
3200 DECL_IN_CONSTANT_POOL (decl
) = 1;
3201 DECL_INITIAL (decl
) = desc
->value
;
3202 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3203 architectures so use DATA_ALIGNMENT as well, except for strings. */
3204 if (TREE_CODE (exp
) == STRING_CST
)
3206 #ifdef CONSTANT_ALIGNMENT
3207 DECL_ALIGN (decl
) = CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
));
3211 align_variable (decl
, 0);
3213 /* Now construct the SYMBOL_REF and the MEM. */
3214 if (use_object_blocks_p ())
3216 section
*sect
= get_constant_section (exp
, DECL_ALIGN (decl
));
3217 symbol
= create_block_symbol (ggc_strdup (label
),
3218 get_block_for_section (sect
), -1);
3221 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3222 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3223 SET_SYMBOL_REF_DECL (symbol
, decl
);
3224 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3226 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3227 set_mem_attributes (rtl
, exp
, 1);
3228 set_mem_alias_set (rtl
, 0);
3229 set_mem_alias_set (rtl
, const_alias_set
);
3231 /* We cannot share RTX'es in pool entries.
3232 Mark this piece of RTL as required for unsharing. */
3233 RTX_FLAG (rtl
, used
) = 1;
3235 /* Set flags or add text to the name to record information, such as
3236 that it is a local symbol. If the name is changed, the macro
3237 ASM_OUTPUT_LABELREF will have to know how to strip this
3238 information. This call might invalidate our local variable
3239 SYMBOL; we can't use it afterward. */
3240 targetm
.encode_section_info (exp
, rtl
, true);
3247 /* Return an rtx representing a reference to constant data in memory
3248 for the constant expression EXP.
3250 If assembler code for such a constant has already been output,
3251 return an rtx to refer to it.
3252 Otherwise, output such a constant in memory
3253 and generate an rtx for it.
3255 If DEFER is nonzero, this constant can be deferred and output only
3256 if referenced in the function after all optimizations.
3258 `const_desc_table' records which constants already have label strings. */
3261 output_constant_def (tree exp
, int defer
)
3263 struct constant_descriptor_tree
*desc
;
3264 struct constant_descriptor_tree key
;
3267 /* Look up EXP in the table of constant descriptors. If we didn't find
3268 it, create a new one. */
3270 key
.hash
= const_hash_1 (exp
);
3271 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3273 desc
= (struct constant_descriptor_tree
*) *loc
;
3276 desc
= build_constant_desc (exp
);
3277 desc
->hash
= key
.hash
;
3281 maybe_output_constant_def_contents (desc
, defer
);
3285 /* Subroutine of output_constant_def: Decide whether or not we need to
3286 output the constant DESC now, and if so, do it. */
3288 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3291 rtx symbol
= XEXP (desc
->rtl
, 0);
3292 tree exp
= desc
->value
;
3294 if (flag_syntax_only
)
3297 if (TREE_ASM_WRITTEN (exp
))
3298 /* Already output; don't do it again. */
3301 /* We can always defer constants as long as the context allows
3305 /* Increment n_deferred_constants if it exists. It needs to be at
3306 least as large as the number of constants actually referred to
3307 by the function. If it's too small we'll stop looking too early
3308 and fail to emit constants; if it's too large we'll only look
3309 through the entire function when we could have stopped earlier. */
3311 n_deferred_constants
++;
3315 output_constant_def_contents (symbol
);
3318 /* Subroutine of output_constant_def_contents. Output the definition
3319 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3320 constant's alignment in bits. */
3323 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3327 size
= get_constant_size (exp
);
3329 /* Do any machine/system dependent processing of the constant. */
3330 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3332 /* Output the value of EXP. */
3333 output_constant (exp
, size
, align
);
3336 /* We must output the constant data referred to by SYMBOL; do so. */
3339 output_constant_def_contents (rtx symbol
)
3341 tree decl
= SYMBOL_REF_DECL (symbol
);
3342 tree exp
= DECL_INITIAL (decl
);
3344 bool asan_protected
= false;
3346 /* Make sure any other constants whose addresses appear in EXP
3347 are assigned label numbers. */
3348 output_addressed_constants (exp
);
3350 /* We are no longer deferring this constant. */
3351 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3353 if ((flag_sanitize
& SANITIZE_ADDRESS
)
3354 && TREE_CODE (exp
) == STRING_CST
3355 && asan_protect_global (exp
))
3357 asan_protected
= true;
3358 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
3359 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
3362 /* If the constant is part of an object block, make sure that the
3363 decl has been positioned within its block, but do not write out
3364 its definition yet. output_object_blocks will do that later. */
3365 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3366 place_block_symbol (symbol
);
3369 align
= DECL_ALIGN (decl
);
3370 switch_to_section (get_constant_section (exp
, align
));
3371 if (align
> BITS_PER_UNIT
)
3372 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3373 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3376 HOST_WIDE_INT size
= get_constant_size (exp
);
3377 assemble_zeros (asan_red_zone_size (size
));
3382 /* Look up EXP in the table of constant descriptors. Return the rtl
3383 if it has been emitted, else null. */
3386 lookup_constant_def (tree exp
)
3388 struct constant_descriptor_tree
*desc
;
3389 struct constant_descriptor_tree key
;
3392 key
.hash
= const_hash_1 (exp
);
3393 desc
= (struct constant_descriptor_tree
*)
3394 htab_find_with_hash (const_desc_htab
, &key
, key
.hash
);
3396 return (desc
? desc
->rtl
: NULL_RTX
);
3399 /* Return a tree representing a reference to constant data in memory
3400 for the constant expression EXP.
3402 This is the counterpart of output_constant_def at the Tree level. */
3405 tree_output_constant_def (tree exp
)
3407 struct constant_descriptor_tree
*desc
, key
;
3411 /* Look up EXP in the table of constant descriptors. If we didn't find
3412 it, create a new one. */
3414 key
.hash
= const_hash_1 (exp
);
3415 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3417 desc
= (struct constant_descriptor_tree
*) *loc
;
3420 desc
= build_constant_desc (exp
);
3421 desc
->hash
= key
.hash
;
3425 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3426 varpool_node::finalize_decl (decl
);
3430 /* Used in the hash tables to avoid outputting the same constant
3431 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3432 are output once per function, not once per file. */
3433 /* ??? Only a few targets need per-function constant pools. Most
3434 can use one per-file pool. Should add a targetm bit to tell the
3437 struct GTY(()) rtx_constant_pool
{
3438 /* Pointers to first and last constant in pool, as ordered by offset. */
3439 struct constant_descriptor_rtx
*first
;
3440 struct constant_descriptor_rtx
*last
;
3442 /* Hash facility for making memory-constants from constant rtl-expressions.
3443 It is used on RISC machines where immediate integer arguments and
3444 constant addresses are restricted so that such constants must be stored
3446 htab_t
GTY((param_is (struct constant_descriptor_rtx
))) const_rtx_htab
;
3448 /* Current offset in constant pool (does not include any
3449 machine-specific header). */
3450 HOST_WIDE_INT offset
;
3453 struct GTY((chain_next ("%h.next"))) constant_descriptor_rtx
{
3454 struct constant_descriptor_rtx
*next
;
3458 HOST_WIDE_INT offset
;
3460 enum machine_mode mode
;
3466 /* Hash and compare functions for const_rtx_htab. */
3469 const_desc_rtx_hash (const void *ptr
)
3471 const struct constant_descriptor_rtx
*const desc
3472 = (const struct constant_descriptor_rtx
*) ptr
;
3477 const_desc_rtx_eq (const void *a
, const void *b
)
3479 const struct constant_descriptor_rtx
*const x
3480 = (const struct constant_descriptor_rtx
*) a
;
3481 const struct constant_descriptor_rtx
*const y
3482 = (const struct constant_descriptor_rtx
*) b
;
3484 if (x
->mode
!= y
->mode
)
3486 return rtx_equal_p (x
->constant
, y
->constant
);
3489 /* Hash one component of a constant. */
3492 const_rtx_hash_1 (const_rtx x
)
3494 unsigned HOST_WIDE_INT hwi
;
3495 enum machine_mode mode
;
3500 code
= GET_CODE (x
);
3501 mode
= GET_MODE (x
);
3502 h
= (hashval_t
) code
* 1048573 + mode
;
3511 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3512 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3514 h
^= (hashval_t
) hwi
;
3515 for (i
= 1; i
< n
; ++i
)
3518 h
^= (hashval_t
) hwi
;
3523 case CONST_WIDE_INT
:
3524 hwi
= GET_MODE_PRECISION (mode
);
3526 for (i
= 0; i
< CONST_WIDE_INT_NUNITS (x
); i
++)
3527 hwi
^= CONST_WIDE_INT_ELT (x
, i
);
3532 if (TARGET_SUPPORTS_WIDE_INT
== 0 && mode
== VOIDmode
)
3534 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3538 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3542 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3546 h
^= htab_hash_string (XSTR (x
, 0));
3550 h
= h
* 251 + CODE_LABEL_NUMBER (XEXP (x
, 0));
3554 case UNSPEC_VOLATILE
:
3555 h
= h
* 251 + XINT (x
, 1);
3565 /* Compute a hash value for X, which should be a constant. */
3568 const_rtx_hash (rtx x
)
3571 subrtx_iterator::array_type array
;
3572 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
3573 h
= h
* 509 + const_rtx_hash_1 (*iter
);
3578 /* Create and return a new rtx constant pool. */
3580 static struct rtx_constant_pool
*
3581 create_constant_pool (void)
3583 struct rtx_constant_pool
*pool
;
3585 pool
= ggc_alloc
<rtx_constant_pool
> ();
3586 pool
->const_rtx_htab
= htab_create_ggc (31, const_desc_rtx_hash
,
3587 const_desc_rtx_eq
, NULL
);
3594 /* Initialize constant pool hashing for a new function. */
3597 init_varasm_status (void)
3599 crtl
->varasm
.pool
= create_constant_pool ();
3600 crtl
->varasm
.deferred_constants
= 0;
3603 /* Given a MINUS expression, simplify it if both sides
3604 include the same symbol. */
3607 simplify_subtraction (rtx x
)
3609 rtx r
= simplify_rtx (x
);
3613 /* Given a constant rtx X, make (or find) a memory constant for its value
3614 and return a MEM rtx to refer to it in memory. */
3617 force_const_mem (enum machine_mode mode
, rtx x
)
3619 struct constant_descriptor_rtx
*desc
, tmp
;
3620 struct rtx_constant_pool
*pool
;
3627 /* If we're not allowed to drop X into the constant pool, don't. */
3628 if (targetm
.cannot_force_const_mem (mode
, x
))
3631 /* Record that this function has used a constant pool entry. */
3632 crtl
->uses_const_pool
= 1;
3634 /* Decide which pool to use. */
3635 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3636 ? shared_constant_pool
3637 : crtl
->varasm
.pool
);
3639 /* Lookup the value in the hashtable. */
3642 hash
= const_rtx_hash (x
);
3643 slot
= htab_find_slot_with_hash (pool
->const_rtx_htab
, &tmp
, hash
, INSERT
);
3644 desc
= (struct constant_descriptor_rtx
*) *slot
;
3646 /* If the constant was already present, return its memory. */
3648 return copy_rtx (desc
->mem
);
3650 /* Otherwise, create a new descriptor. */
3651 desc
= ggc_alloc
<constant_descriptor_rtx
> ();
3654 /* Align the location counter as required by EXP's data type. */
3655 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3656 #ifdef CONSTANT_ALIGNMENT
3658 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3659 if (type
!= NULL_TREE
)
3660 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3664 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3665 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3668 desc
->constant
= copy_rtx (tmp
.constant
);
3669 desc
->offset
= pool
->offset
;
3672 desc
->align
= align
;
3673 desc
->labelno
= const_labelno
;
3676 pool
->offset
+= GET_MODE_SIZE (mode
);
3678 pool
->last
->next
= desc
;
3680 pool
->first
= pool
->last
= desc
;
3683 /* Create a string containing the label name, in LABEL. */
3684 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3687 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3688 the constants pool. */
3689 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3691 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3692 symbol
= create_block_symbol (ggc_strdup (label
),
3693 get_block_for_section (sect
), -1);
3696 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3698 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3699 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3700 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3702 /* Construct the MEM. */
3703 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3704 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3705 set_mem_align (def
, align
);
3707 /* If we're dropping a label to the constant pool, make sure we
3709 if (GET_CODE (x
) == LABEL_REF
)
3710 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3712 return copy_rtx (def
);
3715 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3718 get_pool_constant (const_rtx addr
)
3720 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3723 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3724 and whether it has been output or not. */
3727 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3729 struct constant_descriptor_rtx
*desc
;
3731 desc
= SYMBOL_REF_CONSTANT (addr
);
3732 *pmarked
= (desc
->mark
!= 0);
3733 return desc
->constant
;
3736 /* Similar, return the mode. */
3739 get_pool_mode (const_rtx addr
)
3741 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3744 /* Return the size of the constant pool. */
3747 get_pool_size (void)
3749 return crtl
->varasm
.pool
->offset
;
3752 /* Worker function for output_constant_pool_1. Emit assembly for X
3753 in MODE with known alignment ALIGN. */
3756 output_constant_pool_2 (enum machine_mode mode
, rtx x
, unsigned int align
)
3758 switch (GET_MODE_CLASS (mode
))
3761 case MODE_DECIMAL_FLOAT
:
3765 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3766 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3767 assemble_real (r
, mode
, align
);
3772 case MODE_PARTIAL_INT
:
3777 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3780 case MODE_VECTOR_FLOAT
:
3781 case MODE_VECTOR_INT
:
3782 case MODE_VECTOR_FRACT
:
3783 case MODE_VECTOR_UFRACT
:
3784 case MODE_VECTOR_ACCUM
:
3785 case MODE_VECTOR_UACCUM
:
3788 enum machine_mode submode
= GET_MODE_INNER (mode
);
3789 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3791 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3792 units
= CONST_VECTOR_NUNITS (x
);
3794 for (i
= 0; i
< units
; i
++)
3796 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3797 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3807 /* Worker function for output_constant_pool. Emit constant DESC,
3808 giving it ALIGN bits of alignment. */
3811 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3818 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3819 whose CODE_LABEL has been deleted. This can occur if a jump table
3820 is eliminated by optimization. If so, write a constant of zero
3821 instead. Note that this can also happen by turning the
3822 CODE_LABEL into a NOTE. */
3823 /* ??? This seems completely and utterly wrong. Certainly it's
3824 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3825 functioning even with INSN_DELETED_P and friends. */
3828 switch (GET_CODE (tmp
))
3831 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3832 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3834 tmp
= XEXP (XEXP (tmp
, 0), 0);
3838 tmp
= XEXP (tmp
, 0);
3839 gcc_assert (!INSN_DELETED_P (tmp
));
3840 gcc_assert (!NOTE_P (tmp
)
3841 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3848 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3849 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3850 align
, desc
->labelno
, done
);
3853 assemble_align (align
);
3855 /* Output the label. */
3856 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3858 /* Output the data. */
3859 output_constant_pool_2 (desc
->mode
, x
, align
);
3861 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3862 sections have proper size. */
3863 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3865 && (in_section
->common
.flags
& SECTION_MERGE
))
3866 assemble_align (align
);
3868 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3874 /* Mark all constants that are referenced by SYMBOL_REFs in X.
3875 Emit referenced deferred strings. */
3878 mark_constants_in_pattern (rtx insn
)
3880 subrtx_iterator::array_type array
;
3881 FOR_EACH_SUBRTX (iter
, array
, PATTERN (insn
), ALL
)
3883 const_rtx x
= *iter
;
3884 if (GET_CODE (x
) == SYMBOL_REF
)
3886 if (CONSTANT_POOL_ADDRESS_P (x
))
3888 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3889 if (desc
->mark
== 0)
3892 iter
.substitute (desc
->constant
);
3895 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3897 tree decl
= SYMBOL_REF_DECL (x
);
3898 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
3900 n_deferred_constants
--;
3901 output_constant_def_contents (CONST_CAST_RTX (x
));
3908 /* Look through appropriate parts of INSN, marking all entries in the
3909 constant pool which are actually being used. Entries that are only
3910 referenced by other constants are also marked as used. Emit
3911 deferred strings that are used. */
3914 mark_constants (rtx_insn
*insn
)
3919 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3920 insns, not any notes that may be attached. We don't want to mark
3921 a constant just because it happens to appear in a REG_EQUIV note. */
3922 if (rtx_sequence
*seq
= dyn_cast
<rtx_sequence
*> (PATTERN (insn
)))
3924 int i
, n
= seq
->len ();
3925 for (i
= 0; i
< n
; ++i
)
3927 rtx subinsn
= seq
->element (i
);
3928 if (INSN_P (subinsn
))
3929 mark_constants_in_pattern (subinsn
);
3933 mark_constants_in_pattern (insn
);
3936 /* Look through the instructions for this function, and mark all the
3937 entries in POOL which are actually being used. Emit deferred constants
3938 which have indeed been used. */
3941 mark_constant_pool (void)
3945 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
3948 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3949 mark_constants (insn
);
3952 /* Write all the constants in POOL. */
3955 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
3957 struct constant_descriptor_rtx
*desc
;
3959 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3962 /* If the constant is part of an object_block, make sure that
3963 the constant has been positioned within its block, but do not
3964 write out its definition yet. output_object_blocks will do
3966 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
3967 && SYMBOL_REF_BLOCK (desc
->sym
))
3968 place_block_symbol (desc
->sym
);
3971 switch_to_section (targetm
.asm_out
.select_rtx_section
3972 (desc
->mode
, desc
->constant
, desc
->align
));
3973 output_constant_pool_1 (desc
, desc
->align
);
3978 /* Mark all constants that are used in the current function, then write
3979 out the function's private constant pool. */
3982 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
3983 tree fndecl ATTRIBUTE_UNUSED
)
3985 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
3987 /* It is possible for gcc to call force_const_mem and then to later
3988 discard the instructions which refer to the constant. In such a
3989 case we do not need to output the constant. */
3990 mark_constant_pool ();
3992 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3993 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3996 output_constant_pool_contents (pool
);
3998 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3999 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4003 /* Write the contents of the shared constant pool. */
4006 output_shared_constant_pool (void)
4008 output_constant_pool_contents (shared_constant_pool
);
4011 /* Determine what kind of relocations EXP may need. */
4014 compute_reloc_for_constant (tree exp
)
4016 int reloc
= 0, reloc2
;
4019 switch (TREE_CODE (exp
))
4023 /* Go inside any operations that get_inner_reference can handle and see
4024 if what's inside is a constant: no need to do anything here for
4025 addresses of variables or functions. */
4026 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4027 tem
= TREE_OPERAND (tem
, 0))
4030 if (TREE_CODE (tem
) == MEM_REF
4031 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
4033 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
4037 if (!targetm
.binds_local_p (tem
))
4044 case POINTER_PLUS_EXPR
:
4045 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4046 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4050 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4051 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4052 /* The difference of two local labels is computable at link time. */
4053 if (reloc
== 1 && reloc2
== 1)
4060 case VIEW_CONVERT_EXPR
:
4061 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4066 unsigned HOST_WIDE_INT idx
;
4067 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4069 reloc
|= compute_reloc_for_constant (tem
);
4079 /* Find all the constants whose addresses are referenced inside of EXP,
4080 and make sure assembler code with a label has been output for each one.
4081 Indicate whether an ADDR_EXPR has been encountered. */
4084 output_addressed_constants (tree exp
)
4088 switch (TREE_CODE (exp
))
4092 /* Go inside any operations that get_inner_reference can handle and see
4093 if what's inside is a constant: no need to do anything here for
4094 addresses of variables or functions. */
4095 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4096 tem
= TREE_OPERAND (tem
, 0))
4099 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4100 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4101 tem
= DECL_INITIAL (tem
);
4103 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4104 output_constant_def (tem
, 0);
4106 if (TREE_CODE (tem
) == MEM_REF
)
4107 output_addressed_constants (TREE_OPERAND (tem
, 0));
4111 case POINTER_PLUS_EXPR
:
4113 output_addressed_constants (TREE_OPERAND (exp
, 1));
4117 case VIEW_CONVERT_EXPR
:
4118 output_addressed_constants (TREE_OPERAND (exp
, 0));
4123 unsigned HOST_WIDE_INT idx
;
4124 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4126 output_addressed_constants (tem
);
4135 /* Whether a constructor CTOR is a valid static constant initializer if all
4136 its elements are. This used to be internal to initializer_constant_valid_p
4137 and has been exposed to let other functions like categorize_ctor_elements
4138 evaluate the property while walking a constructor for other purposes. */
4141 constructor_static_from_elts_p (const_tree ctor
)
4143 return (TREE_CONSTANT (ctor
)
4144 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4145 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4146 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4149 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4152 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4153 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4154 which are valid when ENDTYPE is an integer of any size; in
4155 particular, this does not accept a pointer minus a constant. This
4156 returns null_pointer_node if the VALUE is an absolute constant
4157 which can be used to initialize a static variable. Otherwise it
4161 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4165 if (!INTEGRAL_TYPE_P (endtype
))
4168 op0
= TREE_OPERAND (value
, 0);
4169 op1
= TREE_OPERAND (value
, 1);
4171 /* Like STRIP_NOPS except allow the operand mode to widen. This
4172 works around a feature of fold that simplifies (int)(p1 - p2) to
4173 ((int)p1 - (int)p2) under the theory that the narrower operation
4176 while (CONVERT_EXPR_P (op0
)
4177 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4179 tree inner
= TREE_OPERAND (op0
, 0);
4180 if (inner
== error_mark_node
4181 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4182 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4183 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4188 while (CONVERT_EXPR_P (op1
)
4189 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4191 tree inner
= TREE_OPERAND (op1
, 0);
4192 if (inner
== error_mark_node
4193 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4194 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4195 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4200 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4204 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4205 cache
? cache
+ 2 : NULL
);
4206 /* Both initializers must be known. */
4210 && (op0
== null_pointer_node
4211 || TREE_CODE (value
) == MINUS_EXPR
))
4212 return null_pointer_node
;
4214 /* Support differences between labels. */
4215 if (TREE_CODE (op0
) == LABEL_DECL
4216 && TREE_CODE (op1
) == LABEL_DECL
)
4217 return null_pointer_node
;
4219 if (TREE_CODE (op0
) == STRING_CST
4220 && TREE_CODE (op1
) == STRING_CST
4221 && operand_equal_p (op0
, op1
, 1))
4222 return null_pointer_node
;
4228 /* Helper function of initializer_constant_valid_p.
4229 Return nonzero if VALUE is a valid constant-valued expression
4230 for use in initializing a static variable; one that can be an
4231 element of a "constant" initializer.
4233 Return null_pointer_node if the value is absolute;
4234 if it is relocatable, return the variable that determines the relocation.
4235 We assume that VALUE has been folded as much as possible;
4236 therefore, we do not need to check for such things as
4237 arithmetic-combinations of integers.
4239 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4242 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4246 switch (TREE_CODE (value
))
4249 if (constructor_static_from_elts_p (value
))
4251 unsigned HOST_WIDE_INT idx
;
4253 bool absolute
= true;
4255 if (cache
&& cache
[0] == value
)
4257 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4260 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4267 cache
[1] = NULL_TREE
;
4271 if (reloc
!= null_pointer_node
)
4274 /* For a non-absolute relocation, there is no single
4275 variable that can be "the variable that determines the
4280 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4282 return absolute
? null_pointer_node
: error_mark_node
;
4285 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4293 return null_pointer_node
;
4298 tree op0
= staticp (TREE_OPERAND (value
, 0));
4301 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4302 to be a constant, this is old-skool offsetof-like nonsense. */
4303 if (TREE_CODE (op0
) == INDIRECT_REF
4304 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4305 return null_pointer_node
;
4306 /* Taking the address of a nested function involves a trampoline,
4307 unless we don't need or want one. */
4308 if (TREE_CODE (op0
) == FUNCTION_DECL
4309 && DECL_STATIC_CHAIN (op0
)
4310 && !TREE_NO_TRAMPOLINE (value
))
4312 /* "&{...}" requires a temporary to hold the constructed
4314 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4320 case NON_LVALUE_EXPR
:
4321 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4324 case VIEW_CONVERT_EXPR
:
4326 tree src
= TREE_OPERAND (value
, 0);
4327 tree src_type
= TREE_TYPE (src
);
4328 tree dest_type
= TREE_TYPE (value
);
4330 /* Allow view-conversions from aggregate to non-aggregate type only
4331 if the bit pattern is fully preserved afterwards; otherwise, the
4332 RTL expander won't be able to apply a subsequent transformation
4333 to the underlying constructor. */
4334 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4336 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4337 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4342 /* Allow all other kinds of view-conversion. */
4343 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4348 tree src
= TREE_OPERAND (value
, 0);
4349 tree src_type
= TREE_TYPE (src
);
4350 tree dest_type
= TREE_TYPE (value
);
4352 /* Allow conversions between pointer types, floating-point
4353 types, and offset types. */
4354 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4355 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4356 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4357 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4358 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4360 /* Allow length-preserving conversions between integer types. */
4361 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4362 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4363 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4365 /* Allow conversions between other integer types only if
4367 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4369 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4370 if (inner
== null_pointer_node
)
4371 return null_pointer_node
;
4375 /* Allow (int) &foo provided int is as wide as a pointer. */
4376 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4377 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4378 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4380 /* Likewise conversions from int to pointers, but also allow
4381 conversions from 0. */
4382 if ((POINTER_TYPE_P (dest_type
)
4383 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4384 && INTEGRAL_TYPE_P (src_type
))
4386 if (TREE_CODE (src
) == INTEGER_CST
4387 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4388 return null_pointer_node
;
4389 if (integer_zerop (src
))
4390 return null_pointer_node
;
4391 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4392 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4395 /* Allow conversions to struct or union types if the value
4397 if (TREE_CODE (dest_type
) == RECORD_TYPE
4398 || TREE_CODE (dest_type
) == UNION_TYPE
)
4399 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4403 case POINTER_PLUS_EXPR
:
4405 /* Any valid floating-point constants will have been folded by now;
4406 with -frounding-math we hit this with addition of two constants. */
4407 if (TREE_CODE (endtype
) == REAL_TYPE
)
4409 if (cache
&& cache
[0] == value
)
4411 if (! INTEGRAL_TYPE_P (endtype
)
4412 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4414 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4416 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4419 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4420 endtype
, ncache
+ 2);
4421 /* If either term is absolute, use the other term's relocation. */
4422 if (valid0
== null_pointer_node
)
4424 else if (valid1
== null_pointer_node
)
4426 /* Support narrowing pointer differences. */
4428 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4432 /* Support narrowing pointer differences. */
4433 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4442 if (TREE_CODE (endtype
) == REAL_TYPE
)
4444 if (cache
&& cache
[0] == value
)
4446 if (! INTEGRAL_TYPE_P (endtype
)
4447 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4449 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4451 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4454 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4455 endtype
, ncache
+ 2);
4456 /* Win if second argument is absolute. */
4457 if (valid1
== null_pointer_node
)
4459 /* Win if both arguments have the same relocation.
4460 Then the value is absolute. */
4461 else if (valid0
== valid1
&& valid0
!= 0)
4462 ret
= null_pointer_node
;
4463 /* Since GCC guarantees that string constants are unique in the
4464 generated code, a subtraction between two copies of the same
4465 constant string is absolute. */
4466 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4467 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4468 && operand_equal_p (valid0
, valid1
, 1))
4469 ret
= null_pointer_node
;
4470 /* Support narrowing differences. */
4472 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4476 /* Support narrowing differences. */
4477 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4492 /* Return nonzero if VALUE is a valid constant-valued expression
4493 for use in initializing a static variable; one that can be an
4494 element of a "constant" initializer.
4496 Return null_pointer_node if the value is absolute;
4497 if it is relocatable, return the variable that determines the relocation.
4498 We assume that VALUE has been folded as much as possible;
4499 therefore, we do not need to check for such things as
4500 arithmetic-combinations of integers. */
4502 initializer_constant_valid_p (tree value
, tree endtype
)
4504 return initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4507 /* Return true if VALUE is a valid constant-valued expression
4508 for use in initializing a static bit-field; one that can be
4509 an element of a "constant" initializer. */
4512 initializer_constant_valid_for_bitfield_p (tree value
)
4514 /* For bitfields we support integer constants or possibly nested aggregates
4516 switch (TREE_CODE (value
))
4520 unsigned HOST_WIDE_INT idx
;
4523 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4524 if (!initializer_constant_valid_for_bitfield_p (elt
))
4533 case VIEW_CONVERT_EXPR
:
4534 case NON_LVALUE_EXPR
:
4536 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4545 /* output_constructor outer state of relevance in recursive calls, typically
4546 for nested aggregate bitfields. */
4549 unsigned int bit_offset
; /* current position in ... */
4550 int byte
; /* ... the outer byte buffer. */
4553 static unsigned HOST_WIDE_INT
4554 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int,
4557 /* Output assembler code for constant EXP, with no label.
4558 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4559 Assumes output_addressed_constants has been done on EXP already.
4561 Generate at least SIZE bytes of assembler data, padding at the end
4562 with zeros if necessary. SIZE must always be specified. The returned
4563 value is the actual number of bytes of assembler data generated, which
4564 may be bigger than SIZE if the object contains a variable length field.
4566 SIZE is important for structure constructors,
4567 since trailing members may have been omitted from the constructor.
4568 It is also important for initialization of arrays from string constants
4569 since the full length of the string constant might not be wanted.
4570 It is also needed for initialization of unions, where the initializer's
4571 type is just one member, and that may not be as long as the union.
4573 There a case in which we would fail to output exactly SIZE bytes:
4574 for a structure constructor that wants to produce more than SIZE bytes.
4575 But such constructors will never be generated for any possible input.
4577 ALIGN is the alignment of the data in bits. */
4579 static unsigned HOST_WIDE_INT
4580 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4582 enum tree_code code
;
4583 unsigned HOST_WIDE_INT thissize
;
4585 if (size
== 0 || flag_syntax_only
)
4588 /* See if we're trying to initialize a pointer in a non-default mode
4589 to the address of some declaration somewhere. If the target says
4590 the mode is valid for pointers, assume the target has a way of
4592 if (TREE_CODE (exp
) == NOP_EXPR
4593 && POINTER_TYPE_P (TREE_TYPE (exp
))
4594 && targetm
.addr_space
.valid_pointer_mode
4595 (TYPE_MODE (TREE_TYPE (exp
)),
4596 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4598 tree saved_type
= TREE_TYPE (exp
);
4600 /* Peel off any intermediate conversions-to-pointer for valid
4602 while (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
)))))
4607 exp
= TREE_OPERAND (exp
, 0);
4609 /* If what we're left with is the address of something, we can
4610 convert the address to the final type and output it that
4612 if (TREE_CODE (exp
) == ADDR_EXPR
)
4613 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4614 /* Likewise for constant ints. */
4615 else if (TREE_CODE (exp
) == INTEGER_CST
)
4616 exp
= wide_int_to_tree (saved_type
, exp
);
4620 /* Eliminate any conversions since we'll be outputting the underlying
4622 while (CONVERT_EXPR_P (exp
)
4623 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4624 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4626 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4627 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4629 /* Make sure eliminating the conversion is really a no-op, except with
4630 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4631 union types to allow for Ada unchecked unions. */
4632 if (type_size
> op_size
4633 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4634 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4635 /* Keep the conversion. */
4638 exp
= TREE_OPERAND (exp
, 0);
4641 code
= TREE_CODE (TREE_TYPE (exp
));
4642 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4644 /* Allow a constructor with no elements for any data type.
4645 This means to fill the space with zeros. */
4646 if (TREE_CODE (exp
) == CONSTRUCTOR
4647 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4649 assemble_zeros (size
);
4653 if (TREE_CODE (exp
) == FDESC_EXPR
)
4655 #ifdef ASM_OUTPUT_FDESC
4656 HOST_WIDE_INT part
= tree_to_shwi (TREE_OPERAND (exp
, 1));
4657 tree decl
= TREE_OPERAND (exp
, 0);
4658 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4665 /* Now output the underlying data. If we've handling the padding, return.
4666 Otherwise, break and ensure SIZE is the size written. */
4673 case REFERENCE_TYPE
:
4675 case FIXED_POINT_TYPE
:
4677 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4678 EXPAND_INITIALIZER
),
4679 MIN (size
, thissize
), align
, 0))
4680 error ("initializer for integer/fixed-point value is too complicated");
4684 if (TREE_CODE (exp
) != REAL_CST
)
4685 error ("initializer for floating value is not a floating constant");
4687 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4691 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4692 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4693 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4698 switch (TREE_CODE (exp
))
4701 return output_constructor (exp
, size
, align
, NULL
);
4704 = MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
), size
);
4705 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4709 enum machine_mode inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4710 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4711 int elt_size
= GET_MODE_SIZE (inner
);
4712 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
);
4713 thissize
= elt_size
;
4714 for (unsigned int i
= 1; i
< VECTOR_CST_NELTS (exp
); i
++)
4716 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
);
4717 thissize
+= elt_size
;
4728 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4729 return output_constructor (exp
, size
, align
, NULL
);
4738 if (size
> thissize
)
4739 assemble_zeros (size
- thissize
);
4745 /* Subroutine of output_constructor, used for computing the size of
4746 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4747 type with an unspecified upper bound. */
4749 static unsigned HOST_WIDE_INT
4750 array_size_for_constructor (tree val
)
4753 unsigned HOST_WIDE_INT cnt
;
4754 tree index
, value
, tmp
;
4757 /* This code used to attempt to handle string constants that are not
4758 arrays of single-bytes, but nothing else does, so there's no point in
4760 if (TREE_CODE (val
) == STRING_CST
)
4761 return TREE_STRING_LENGTH (val
);
4763 max_index
= NULL_TREE
;
4764 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4766 if (TREE_CODE (index
) == RANGE_EXPR
)
4767 index
= TREE_OPERAND (index
, 1);
4768 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4772 if (max_index
== NULL_TREE
)
4775 /* Compute the total number of array elements. */
4776 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4777 i
= wi::to_offset (max_index
) - wi::to_offset (tmp
) + 1;
4779 /* Multiply by the array element unit size to find number of bytes. */
4780 i
*= wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4782 gcc_assert (wi::fits_uhwi_p (i
));
4783 return i
.to_uhwi ();
4786 /* Other datastructures + helpers for output_constructor. */
4788 /* output_constructor local state to support interaction with helpers. */
4792 /* Received arguments. */
4793 tree exp
; /* Constructor expression. */
4794 tree type
; /* Type of constructor expression. */
4795 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4796 unsigned int align
; /* Known initial alignment. */
4797 tree min_index
; /* Lower bound if specified for an array. */
4799 /* Output processing state. */
4800 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4801 int byte
; /* Part of a bitfield byte yet to be output. */
4802 int last_relative_index
; /* Implicit or explicit index of the last
4803 array element output within a bitfield. */
4804 bool byte_buffer_in_use
; /* Whether BYTE is in use. */
4806 /* Current element. */
4807 tree field
; /* Current field decl in a record. */
4808 tree val
; /* Current element value. */
4809 tree index
; /* Current element index. */
4813 /* Helper for output_constructor. From the current LOCAL state, output a
4814 RANGE_EXPR element. */
4817 output_constructor_array_range (oc_local_state
*local
)
4819 unsigned HOST_WIDE_INT fieldsize
4820 = int_size_in_bytes (TREE_TYPE (local
->type
));
4822 HOST_WIDE_INT lo_index
4823 = tree_to_shwi (TREE_OPERAND (local
->index
, 0));
4824 HOST_WIDE_INT hi_index
4825 = tree_to_shwi (TREE_OPERAND (local
->index
, 1));
4826 HOST_WIDE_INT index
;
4829 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4831 for (index
= lo_index
; index
<= hi_index
; index
++)
4833 /* Output the element's initial value. */
4834 if (local
->val
== NULL_TREE
)
4835 assemble_zeros (fieldsize
);
4837 fieldsize
= output_constant (local
->val
, fieldsize
, align2
);
4839 /* Count its size. */
4840 local
->total_bytes
+= fieldsize
;
4844 /* Helper for output_constructor. From the current LOCAL state, output a
4845 field element that is not true bitfield or part of an outer one. */
4848 output_constructor_regular_field (oc_local_state
*local
)
4850 /* Field size and position. Since this structure is static, we know the
4851 positions are constant. */
4852 unsigned HOST_WIDE_INT fieldsize
;
4853 HOST_WIDE_INT fieldpos
;
4855 unsigned int align2
;
4857 if (local
->index
!= NULL_TREE
)
4859 /* Perform the index calculation in modulo arithmetic but
4860 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4861 but we are using an unsigned sizetype. */
4862 unsigned prec
= TYPE_PRECISION (sizetype
);
4863 offset_int idx
= wi::sext (wi::to_offset (local
->index
)
4864 - wi::to_offset (local
->min_index
), prec
);
4865 fieldpos
= (idx
* wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
))))
4868 else if (local
->field
!= NULL_TREE
)
4869 fieldpos
= int_byte_position (local
->field
);
4873 /* Output any buffered-up bit-fields preceding this element. */
4874 if (local
->byte_buffer_in_use
)
4876 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4877 local
->total_bytes
++;
4878 local
->byte_buffer_in_use
= false;
4881 /* Advance to offset of this element.
4882 Note no alignment needed in an array, since that is guaranteed
4883 if each element has the proper size. */
4884 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4885 && fieldpos
> local
->total_bytes
)
4887 assemble_zeros (fieldpos
- local
->total_bytes
);
4888 local
->total_bytes
= fieldpos
;
4891 /* Find the alignment of this element. */
4892 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
4894 /* Determine size this element should occupy. */
4899 /* If this is an array with an unspecified upper bound,
4900 the initializer determines the size. */
4901 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4902 but we cannot do this until the deprecated support for
4903 initializing zero-length array members is removed. */
4904 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
4905 && TYPE_DOMAIN (TREE_TYPE (local
->field
))
4906 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
))))
4908 fieldsize
= array_size_for_constructor (local
->val
);
4909 /* Given a non-empty initialization, this field had
4911 gcc_assert (!fieldsize
|| !DECL_CHAIN (local
->field
));
4914 fieldsize
= tree_to_uhwi (DECL_SIZE_UNIT (local
->field
));
4917 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
4919 /* Output the element's initial value. */
4920 if (local
->val
== NULL_TREE
)
4921 assemble_zeros (fieldsize
);
4923 fieldsize
= output_constant (local
->val
, fieldsize
, align2
);
4925 /* Count its size. */
4926 local
->total_bytes
+= fieldsize
;
4929 /* Helper for output_constructor. From the LOCAL state, output an element
4930 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
4931 from the start of a possibly ongoing outer byte buffer. */
4934 output_constructor_bitfield (oc_local_state
*local
, unsigned int bit_offset
)
4936 /* Bit size of this element. */
4937 HOST_WIDE_INT ebitsize
4939 ? tree_to_uhwi (DECL_SIZE (local
->field
))
4940 : tree_to_uhwi (TYPE_SIZE (TREE_TYPE (local
->type
))));
4942 /* Relative index of this element if this is an array component. */
4943 HOST_WIDE_INT relative_index
4946 ? (tree_to_shwi (local
->index
)
4947 - tree_to_shwi (local
->min_index
))
4948 : local
->last_relative_index
+ 1)
4951 /* Bit position of this element from the start of the containing
4953 HOST_WIDE_INT constructor_relative_ebitpos
4955 ? int_bit_position (local
->field
)
4956 : ebitsize
* relative_index
);
4958 /* Bit position of this element from the start of a possibly ongoing
4959 outer byte buffer. */
4960 HOST_WIDE_INT byte_relative_ebitpos
4961 = bit_offset
+ constructor_relative_ebitpos
;
4963 /* From the start of a possibly ongoing outer byte buffer, offsets to
4964 the first bit of this element and to the first bit past the end of
4966 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
4967 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
4969 local
->last_relative_index
= relative_index
;
4971 if (local
->val
== NULL_TREE
)
4972 local
->val
= integer_zero_node
;
4974 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
4975 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
4976 local
->val
= TREE_OPERAND (local
->val
, 0);
4978 if (TREE_CODE (local
->val
) != INTEGER_CST
4979 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
4981 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
4985 /* If this field does not start in this (or next) byte, skip some bytes. */
4986 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4988 /* Output remnant of any bit field in previous bytes. */
4989 if (local
->byte_buffer_in_use
)
4991 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4992 local
->total_bytes
++;
4993 local
->byte_buffer_in_use
= false;
4996 /* If still not at proper byte, advance to there. */
4997 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4999 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
5000 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
5001 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
5005 /* Set up the buffer if necessary. */
5006 if (!local
->byte_buffer_in_use
)
5010 local
->byte_buffer_in_use
= true;
5013 /* If this is nested constructor, recurse passing the bit offset and the
5014 pending data, then retrieve the new pending data afterwards. */
5015 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
5017 oc_outer_state temp_state
;
5018 temp_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
5019 temp_state
.byte
= local
->byte
;
5021 += output_constructor (local
->val
, 0, 0, &temp_state
);
5022 local
->byte
= temp_state
.byte
;
5026 /* Otherwise, we must split the element into pieces that fall within
5027 separate bytes, and combine each byte with previous or following
5029 while (next_offset
< end_offset
)
5033 HOST_WIDE_INT value
;
5034 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
5035 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
5037 /* Advance from byte to byte within this element when necessary. */
5038 while (next_byte
!= local
->total_bytes
)
5040 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5041 local
->total_bytes
++;
5045 /* Number of bits we can process at once (all part of the same byte). */
5046 this_time
= MIN (end_offset
- next_offset
, BITS_PER_UNIT
- next_bit
);
5047 if (BYTES_BIG_ENDIAN
)
5049 /* On big-endian machine, take the most significant bits (of the
5050 bits that are significant) first and put them into bytes from
5051 the most significant end. */
5052 shift
= end_offset
- next_offset
- this_time
;
5054 /* Don't try to take a bunch of bits that cross
5055 the word boundary in the INTEGER_CST. We can
5056 only select bits from one element. */
5057 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5058 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5060 const int end
= shift
+ this_time
- 1;
5061 shift
= end
& -HOST_BITS_PER_WIDE_INT
;
5062 this_time
= end
- shift
+ 1;
5065 /* Now get the bits from the appropriate constant word. */
5066 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5067 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5069 /* Get the result. This works only when:
5070 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5071 local
->byte
|= (((value
>> shift
)
5072 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5073 << (BITS_PER_UNIT
- this_time
- next_bit
));
5077 /* On little-endian machines, take the least significant bits of
5078 the value first and pack them starting at the least significant
5079 bits of the bytes. */
5080 shift
= next_offset
- byte_relative_ebitpos
;
5082 /* Don't try to take a bunch of bits that cross
5083 the word boundary in the INTEGER_CST. We can
5084 only select bits from one element. */
5085 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5086 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5088 = HOST_BITS_PER_WIDE_INT
- (shift
& (HOST_BITS_PER_WIDE_INT
- 1));
5090 /* Now get the bits from the appropriate constant word. */
5091 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5092 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5094 /* Get the result. This works only when:
5095 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5096 local
->byte
|= (((value
>> shift
)
5097 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5101 next_offset
+= this_time
;
5102 local
->byte_buffer_in_use
= true;
5106 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5107 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5108 caller output state of relevance in recursive invocations. */
5110 static unsigned HOST_WIDE_INT
5111 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
5112 unsigned int align
, oc_outer_state
*outer
)
5114 unsigned HOST_WIDE_INT cnt
;
5115 constructor_elt
*ce
;
5117 oc_local_state local
;
5119 /* Setup our local state to communicate with helpers. */
5121 local
.type
= TREE_TYPE (exp
);
5123 local
.align
= align
;
5124 if (TREE_CODE (local
.type
) == ARRAY_TYPE
&& TYPE_DOMAIN (local
.type
))
5125 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5127 local
.min_index
= NULL_TREE
;
5129 local
.total_bytes
= 0;
5130 local
.byte_buffer_in_use
= outer
!= NULL
;
5131 local
.byte
= outer
? outer
->byte
: 0;
5132 local
.last_relative_index
= -1;
5134 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5136 /* As CE goes through the elements of the constant, FIELD goes through the
5137 structure fields if the constant is a structure. If the constant is a
5138 union, we override this by getting the field from the TREE_LIST element.
5139 But the constant could also be an array. Then FIELD is zero.
5141 There is always a maximum of one element in the chain LINK for unions
5142 (even if the initializer in a source program incorrectly contains
5145 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5146 local
.field
= TYPE_FIELDS (local
.type
);
5148 local
.field
= NULL_TREE
;
5151 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5152 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5154 local
.val
= ce
->value
;
5155 local
.index
= NULL_TREE
;
5157 /* The element in a union constructor specifies the proper field
5159 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5160 local
.field
= ce
->index
;
5162 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5163 local
.index
= ce
->index
;
5165 if (local
.field
&& flag_verbose_asm
)
5166 fprintf (asm_out_file
, "%s %s:\n",
5168 DECL_NAME (local
.field
)
5169 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5172 /* Eliminate the marker that makes a cast not be an lvalue. */
5173 if (local
.val
!= NULL_TREE
)
5174 STRIP_NOPS (local
.val
);
5176 /* Output the current element, using the appropriate helper ... */
5178 /* For an array slice not part of an outer bitfield. */
5180 && local
.index
!= NULL_TREE
5181 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5182 output_constructor_array_range (&local
);
5184 /* For a field that is neither a true bitfield nor part of an outer one,
5185 known to be at least byte aligned and multiple-of-bytes long. */
5187 && (local
.field
== NULL_TREE
5188 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5189 output_constructor_regular_field (&local
);
5191 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5192 supported for scalar fields, so we may need to convert first. */
5195 if (TREE_CODE (local
.val
) == REAL_CST
)
5197 = fold_unary (VIEW_CONVERT_EXPR
,
5198 build_nonstandard_integer_type
5199 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5201 output_constructor_bitfield (&local
, outer
? outer
->bit_offset
: 0);
5205 /* If we are not at toplevel, save the pending data for our caller.
5206 Otherwise output the pending data and padding zeros as needed. */
5208 outer
->byte
= local
.byte
;
5211 if (local
.byte_buffer_in_use
)
5213 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5214 local
.total_bytes
++;
5217 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5219 assemble_zeros (local
.size
- local
.total_bytes
);
5220 local
.total_bytes
= local
.size
;
5224 return local
.total_bytes
;
5227 /* Mark DECL as weak. */
5230 mark_weak (tree decl
)
5232 DECL_WEAK (decl
) = 1;
5234 if (DECL_RTL_SET_P (decl
)
5235 && MEM_P (DECL_RTL (decl
))
5236 && XEXP (DECL_RTL (decl
), 0)
5237 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5238 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5241 /* Merge weak status between NEWDECL and OLDDECL. */
5244 merge_weak (tree newdecl
, tree olddecl
)
5246 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5248 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5251 /* We put the NEWDECL on the weak_decls list at some point
5252 and OLDDECL as well. Keep just OLDDECL on the list. */
5253 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5254 if (TREE_VALUE (*pwd
) == newdecl
)
5256 *pwd
= TREE_CHAIN (*pwd
);
5263 if (DECL_WEAK (newdecl
))
5267 /* NEWDECL is weak, but OLDDECL is not. */
5269 /* If we already output the OLDDECL, we're in trouble; we can't
5270 go back and make it weak. This should never happen in
5271 unit-at-a-time compilation. */
5272 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5274 /* If we've already generated rtl referencing OLDDECL, we may
5275 have done so in a way that will not function properly with
5276 a weak symbol. Again in unit-at-a-time this should be
5278 gcc_assert (!TREE_USED (olddecl
)
5279 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5281 if (TARGET_SUPPORTS_WEAK
)
5283 /* We put the NEWDECL on the weak_decls list at some point.
5284 Replace it with the OLDDECL. */
5285 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5286 if (TREE_VALUE (wd
) == newdecl
)
5288 TREE_VALUE (wd
) = olddecl
;
5291 /* We may not find the entry on the list. If NEWDECL is a
5292 weak alias, then we will have already called
5293 globalize_decl to remove the entry; in that case, we do
5294 not need to do anything. */
5297 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5298 mark_weak (olddecl
);
5301 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5302 weak. Just update NEWDECL to indicate that it's weak too. */
5303 mark_weak (newdecl
);
5306 /* Declare DECL to be a weak symbol. */
5309 declare_weak (tree decl
)
5311 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5312 if (! TREE_PUBLIC (decl
))
5313 error ("weak declaration of %q+D must be public", decl
);
5314 else if (!TARGET_SUPPORTS_WEAK
)
5315 warning (0, "weak declaration of %q+D not supported", decl
);
5318 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5319 DECL_ATTRIBUTES (decl
)
5320 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5324 weak_finish_1 (tree decl
)
5326 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5327 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5330 if (! TREE_USED (decl
))
5333 #ifdef ASM_WEAKEN_DECL
5334 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5336 #ifdef ASM_WEAKEN_LABEL
5337 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5339 #ifdef ASM_OUTPUT_WEAK_ALIAS
5341 static bool warn_once
= 0;
5344 warning (0, "only weak aliases are supported in this configuration");
5354 /* Fiven an assembly name, find the decl it is associated with. */
5356 find_decl (tree target
)
5358 symtab_node
*node
= symtab_node::get_for_asmname (target
);
5364 /* This TREE_LIST contains weakref targets. */
5366 static GTY(()) tree weakref_targets
;
5368 /* Emit any pending weak declarations. */
5375 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5377 tree alias_decl
= TREE_PURPOSE (t
);
5378 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5380 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5381 /* Remove alias_decl from the weak list, but leave entries for
5382 the target alone. */
5384 #ifndef ASM_OUTPUT_WEAKREF
5385 else if (! TREE_SYMBOL_REFERENCED (target
))
5387 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5388 defined, otherwise we and weak_finish_1 would use
5389 different macros. */
5390 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5391 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5393 tree decl
= find_decl (target
);
5397 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5398 TREE_CODE (alias_decl
), target
,
5399 TREE_TYPE (alias_decl
));
5401 DECL_EXTERNAL (decl
) = 1;
5402 TREE_PUBLIC (decl
) = 1;
5403 DECL_ARTIFICIAL (decl
) = 1;
5404 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5405 TREE_USED (decl
) = 1;
5408 weak_finish_1 (decl
);
5417 /* Remove the alias and the target from the pending weak list
5418 so that we do not emit any .weak directives for the former,
5419 nor multiple .weak directives for the latter. */
5420 for (p
= &weak_decls
; (t2
= *p
) ; )
5422 if (TREE_VALUE (t2
) == alias_decl
5423 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5424 *p
= TREE_CHAIN (t2
);
5426 p
= &TREE_CHAIN (t2
);
5429 /* Remove other weakrefs to the same target, to speed things up. */
5430 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5432 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5433 *p
= TREE_CHAIN (t2
);
5435 p
= &TREE_CHAIN (t2
);
5440 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5442 tree decl
= TREE_VALUE (t
);
5444 weak_finish_1 (decl
);
5448 /* Emit the assembly bits to indicate that DECL is globally visible. */
5451 globalize_decl (tree decl
)
5454 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5455 if (DECL_WEAK (decl
))
5457 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5460 #ifdef ASM_WEAKEN_DECL
5461 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5463 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5466 /* Remove this function from the pending weak list so that
5467 we do not emit multiple .weak directives for it. */
5468 for (p
= &weak_decls
; (t
= *p
) ; )
5470 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5471 *p
= TREE_CHAIN (t
);
5473 p
= &TREE_CHAIN (t
);
5476 /* Remove weakrefs to the same target from the pending weakref
5477 list, for the same reason. */
5478 for (p
= &weakref_targets
; (t
= *p
) ; )
5480 if (DECL_ASSEMBLER_NAME (decl
)
5481 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5482 *p
= TREE_CHAIN (t
);
5484 p
= &TREE_CHAIN (t
);
5491 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5494 vec
<alias_pair
, va_gc
> *alias_pairs
;
5496 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5497 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5498 tree node is DECL to have the value of the tree node TARGET. */
5501 do_assemble_alias (tree decl
, tree target
)
5503 /* Emulated TLS had better not get this var. */
5504 gcc_assert (!(!targetm
.have_tls
5505 && TREE_CODE (decl
) == VAR_DECL
5506 && DECL_THREAD_LOCAL_P (decl
)));
5508 if (TREE_ASM_WRITTEN (decl
))
5511 /* We must force creation of DECL_RTL for debug info generation, even though
5512 we don't use it here. */
5513 make_decl_rtl (decl
);
5515 TREE_ASM_WRITTEN (decl
) = 1;
5516 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5518 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5520 ultimate_transparent_alias_target (&target
);
5522 if (!TREE_SYMBOL_REFERENCED (target
))
5523 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5525 #ifdef ASM_OUTPUT_WEAKREF
5526 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5527 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5528 IDENTIFIER_POINTER (target
));
5530 if (!TARGET_SUPPORTS_WEAK
)
5532 error_at (DECL_SOURCE_LOCATION (decl
),
5533 "weakref is not supported in this configuration");
5540 #ifdef ASM_OUTPUT_DEF
5541 /* Make name accessible from other files, if appropriate. */
5543 if (TREE_PUBLIC (decl
))
5545 globalize_decl (decl
);
5546 maybe_assemble_visibility (decl
);
5548 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5550 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5551 if (targetm
.has_ifunc_p ())
5552 ASM_OUTPUT_TYPE_DIRECTIVE
5553 (asm_out_file
, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5557 error_at (DECL_SOURCE_LOCATION (decl
),
5558 "ifunc is not supported on this target");
5561 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5562 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5564 ASM_OUTPUT_DEF (asm_out_file
,
5565 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5566 IDENTIFIER_POINTER (target
));
5568 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5573 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5574 # ifdef ASM_WEAKEN_DECL
5575 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5577 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5579 /* Remove this function from the pending weak list so that
5580 we do not emit multiple .weak directives for it. */
5581 for (p
= &weak_decls
; (t
= *p
) ; )
5582 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5583 *p
= TREE_CHAIN (t
);
5585 p
= &TREE_CHAIN (t
);
5587 /* Remove weakrefs to the same target from the pending weakref
5588 list, for the same reason. */
5589 for (p
= &weakref_targets
; (t
= *p
) ; )
5591 if (DECL_ASSEMBLER_NAME (decl
)
5592 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5593 *p
= TREE_CHAIN (t
);
5595 p
= &TREE_CHAIN (t
);
5601 /* Emit an assembler directive to make the symbol for DECL an alias to
5602 the symbol for TARGET. */
5605 assemble_alias (tree decl
, tree target
)
5609 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5611 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5613 ultimate_transparent_alias_target (&target
);
5615 if (alias
== target
)
5616 error ("weakref %q+D ultimately targets itself", decl
);
5617 if (TREE_PUBLIC (decl
))
5618 error ("weakref %q+D must have static linkage", decl
);
5622 #if !defined (ASM_OUTPUT_DEF)
5623 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5624 error_at (DECL_SOURCE_LOCATION (decl
),
5625 "alias definitions not supported in this configuration");
5626 TREE_ASM_WRITTEN (decl
) = 1;
5629 if (!DECL_WEAK (decl
))
5631 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5632 error_at (DECL_SOURCE_LOCATION (decl
),
5633 "ifunc is not supported in this configuration");
5635 error_at (DECL_SOURCE_LOCATION (decl
),
5636 "only weak aliases are supported in this configuration");
5637 TREE_ASM_WRITTEN (decl
) = 1;
5643 TREE_USED (decl
) = 1;
5645 /* Allow aliases to aliases. */
5646 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5647 cgraph_node::get_create (decl
)->alias
= true;
5649 varpool_node::get_create (decl
)->alias
= true;
5651 /* If the target has already been emitted, we don't have to queue the
5652 alias. This saves a tad of memory. */
5653 if (symtab
->global_info_ready
)
5654 target_decl
= find_decl (target
);
5657 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5658 || symtab
->state
>= EXPANSION
)
5659 do_assemble_alias (decl
, target
);
5662 alias_pair p
= {decl
, target
};
5663 vec_safe_push (alias_pairs
, p
);
5667 /* Record and output a table of translations from original function
5668 to its transaction aware clone. Note that tm_pure functions are
5669 considered to be their own clone. */
5671 static GTY((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
5672 htab_t tm_clone_hash
;
5675 record_tm_clone_pair (tree o
, tree n
)
5677 struct tree_map
**slot
, *h
;
5679 if (tm_clone_hash
== NULL
)
5680 tm_clone_hash
= htab_create_ggc (32, tree_map_hash
, tree_map_eq
, 0);
5682 h
= ggc_alloc
<tree_map
> ();
5683 h
->hash
= htab_hash_pointer (o
);
5687 slot
= (struct tree_map
**)
5688 htab_find_slot_with_hash (tm_clone_hash
, h
, h
->hash
, INSERT
);
5693 get_tm_clone_pair (tree o
)
5697 struct tree_map
*h
, in
;
5700 in
.hash
= htab_hash_pointer (o
);
5701 h
= (struct tree_map
*) htab_find_with_hash (tm_clone_hash
,
5709 typedef struct tm_alias_pair
5717 /* Helper function for finish_tm_clone_pairs. Dump a hash table entry
5718 into a VEC in INFO. */
5721 dump_tm_clone_to_vec (void **slot
, void *info
)
5723 struct tree_map
*map
= (struct tree_map
*) *slot
;
5724 vec
<tm_alias_pair
> *tm_alias_pairs
= (vec
<tm_alias_pair
> *) info
;
5725 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5726 tm_alias_pairs
->safe_push (p
);
5730 /* Dump the actual pairs to the .tm_clone_table section. */
5733 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5737 bool switched
= false;
5739 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5743 struct cgraph_node
*src_n
= cgraph_node::get (src
);
5744 struct cgraph_node
*dst_n
= cgraph_node::get (dst
);
5746 /* The function ipa_tm_create_version() marks the clone as needed if
5747 the original function was needed. But we also mark the clone as
5748 needed if we ever called the clone indirectly through
5749 TM_GETTMCLONE. If neither of these are true, we didn't generate
5750 a clone, and we didn't call it indirectly... no sense keeping it
5751 in the clone table. */
5752 if (!dst_n
|| !dst_n
->definition
)
5755 /* This covers the case where we have optimized the original
5756 function away, and only access the transactional clone. */
5757 if (!src_n
|| !src_n
->definition
)
5762 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5763 assemble_align (POINTER_SIZE
);
5767 assemble_integer (XEXP (DECL_RTL (src
), 0),
5768 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5769 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5770 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5774 /* Provide a default for the tm_clone_table section. */
5777 default_clone_table_section (void)
5779 return get_named_section (NULL
, ".tm_clone_table", 3);
5782 /* Helper comparison function for qsorting by the DECL_UID stored in
5783 alias_pair->emitted_diags. */
5786 tm_alias_pair_cmp (const void *x
, const void *y
)
5788 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5789 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5790 if (p1
->uid
< p2
->uid
)
5792 if (p1
->uid
> p2
->uid
)
5798 finish_tm_clone_pairs (void)
5800 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5802 if (tm_clone_hash
== NULL
)
5805 /* We need a determenistic order for the .tm_clone_table, otherwise
5806 we will get bootstrap comparison failures, so dump the hash table
5807 to a vector, sort it, and dump the vector. */
5809 /* Dump the hashtable to a vector. */
5810 htab_traverse_noresize (tm_clone_hash
, dump_tm_clone_to_vec
,
5811 (void *) &tm_alias_pairs
);
5813 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5816 dump_tm_clone_pairs (tm_alias_pairs
);
5818 htab_delete (tm_clone_hash
);
5819 tm_clone_hash
= NULL
;
5820 tm_alias_pairs
.release ();
5824 /* Emit an assembler directive to set symbol for DECL visibility to
5825 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5828 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5829 int vis ATTRIBUTE_UNUSED
)
5831 #ifdef HAVE_GAS_HIDDEN
5832 static const char * const visibility_types
[] = {
5833 NULL
, "protected", "hidden", "internal"
5836 const char *name
, *type
;
5838 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5839 type
= visibility_types
[vis
];
5841 fprintf (asm_out_file
, "\t.%s\t", type
);
5842 assemble_name (asm_out_file
, name
);
5843 fprintf (asm_out_file
, "\n");
5845 if (!DECL_ARTIFICIAL (decl
))
5846 warning (OPT_Wattributes
, "visibility attribute not supported "
5847 "in this configuration; ignored");
5851 /* A helper function to call assemble_visibility when needed for a decl. */
5854 maybe_assemble_visibility (tree decl
)
5856 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5858 if (vis
!= VISIBILITY_DEFAULT
)
5860 targetm
.asm_out
.assemble_visibility (decl
, vis
);
5867 /* Returns 1 if the target configuration supports defining public symbols
5868 so that one of them will be chosen at link time instead of generating a
5869 multiply-defined symbol error, whether through the use of weak symbols or
5870 a target-specific mechanism for having duplicates discarded. */
5873 supports_one_only (void)
5875 if (SUPPORTS_ONE_ONLY
)
5877 return TARGET_SUPPORTS_WEAK
;
5880 /* Set up DECL as a public symbol that can be defined in multiple
5881 translation units without generating a linker error. */
5884 make_decl_one_only (tree decl
, tree comdat_group
)
5886 struct symtab_node
*symbol
;
5887 gcc_assert (TREE_CODE (decl
) == VAR_DECL
5888 || TREE_CODE (decl
) == FUNCTION_DECL
);
5890 TREE_PUBLIC (decl
) = 1;
5892 if (TREE_CODE (decl
) == VAR_DECL
)
5893 symbol
= varpool_node::get_create (decl
);
5895 symbol
= cgraph_node::get_create (decl
);
5897 if (SUPPORTS_ONE_ONLY
)
5899 #ifdef MAKE_DECL_ONE_ONLY
5900 MAKE_DECL_ONE_ONLY (decl
);
5902 symbol
->set_comdat_group (comdat_group
);
5904 else if (TREE_CODE (decl
) == VAR_DECL
5905 && (DECL_INITIAL (decl
) == 0
5906 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
5907 DECL_COMMON (decl
) = 1;
5910 gcc_assert (TARGET_SUPPORTS_WEAK
);
5911 DECL_WEAK (decl
) = 1;
5916 init_varasm_once (void)
5918 section_htab
= htab_create_ggc (31, section_entry_hash
,
5919 section_entry_eq
, NULL
);
5920 object_block_htab
= htab_create_ggc (31, object_block_entry_hash
,
5921 object_block_entry_eq
, NULL
);
5922 const_desc_htab
= htab_create_ggc (1009, const_desc_hash
,
5923 const_desc_eq
, NULL
);
5925 const_alias_set
= new_alias_set ();
5926 shared_constant_pool
= create_constant_pool ();
5928 #ifdef TEXT_SECTION_ASM_OP
5929 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
5930 TEXT_SECTION_ASM_OP
);
5933 #ifdef DATA_SECTION_ASM_OP
5934 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5935 DATA_SECTION_ASM_OP
);
5938 #ifdef SDATA_SECTION_ASM_OP
5939 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5940 SDATA_SECTION_ASM_OP
);
5943 #ifdef READONLY_DATA_SECTION_ASM_OP
5944 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
5945 READONLY_DATA_SECTION_ASM_OP
);
5948 #ifdef CTORS_SECTION_ASM_OP
5949 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
5950 CTORS_SECTION_ASM_OP
);
5953 #ifdef DTORS_SECTION_ASM_OP
5954 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
5955 DTORS_SECTION_ASM_OP
);
5958 #ifdef BSS_SECTION_ASM_OP
5959 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5960 output_section_asm_op
,
5961 BSS_SECTION_ASM_OP
);
5964 #ifdef SBSS_SECTION_ASM_OP
5965 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5966 output_section_asm_op
,
5967 SBSS_SECTION_ASM_OP
);
5970 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5971 | SECTION_COMMON
, emit_tls_common
);
5972 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5973 | SECTION_COMMON
, emit_local
);
5974 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5975 | SECTION_COMMON
, emit_common
);
5977 #if defined ASM_OUTPUT_ALIGNED_BSS
5978 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
5982 targetm
.asm_out
.init_sections ();
5984 if (readonly_data_section
== NULL
)
5985 readonly_data_section
= text_section
;
5987 #ifdef ASM_OUTPUT_EXTERNAL
5988 pending_assemble_externals_set
= new hash_set
<tree
>;
5993 decl_default_tls_model (const_tree decl
)
5995 enum tls_model kind
;
5998 is_local
= targetm
.binds_local_p (decl
);
6002 kind
= TLS_MODEL_LOCAL_EXEC
;
6004 kind
= TLS_MODEL_INITIAL_EXEC
;
6007 /* Local dynamic is inefficient when we're not combining the
6008 parts of the address. */
6009 else if (optimize
&& is_local
)
6010 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
6012 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
6013 if (kind
< flag_tls_default
)
6014 kind
= flag_tls_default
;
6019 /* Select a set of attributes for section NAME based on the properties
6020 of DECL and whether or not RELOC indicates that DECL's initializer
6021 might contain runtime relocations.
6023 We make the section read-only and executable for a function decl,
6024 read-only for a const data decl, and writable for a non-const data decl. */
6027 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6031 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6032 flags
= SECTION_CODE
;
6035 enum section_category category
6036 = categorize_decl_for_section (decl
, reloc
);
6037 if (decl_readonly_section_1 (category
))
6039 else if (category
== SECCAT_DATA_REL_RO
6040 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6041 flags
= SECTION_WRITE
| SECTION_RELRO
;
6043 flags
= SECTION_WRITE
;
6047 flags
= SECTION_WRITE
;
6048 if (strcmp (name
, ".data.rel.ro") == 0
6049 || strcmp (name
, ".data.rel.ro.local") == 0)
6050 flags
|= SECTION_RELRO
;
6053 if (decl
&& DECL_P (decl
) && DECL_COMDAT_GROUP (decl
))
6054 flags
|= SECTION_LINKONCE
;
6056 if (strcmp (name
, ".vtable_map_vars") == 0)
6057 flags
|= SECTION_LINKONCE
;
6059 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6060 flags
|= SECTION_TLS
| SECTION_WRITE
;
6062 if (strcmp (name
, ".bss") == 0
6063 || strncmp (name
, ".bss.", 5) == 0
6064 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6065 || strcmp (name
, ".sbss") == 0
6066 || strncmp (name
, ".sbss.", 6) == 0
6067 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6068 flags
|= SECTION_BSS
;
6070 if (strcmp (name
, ".tdata") == 0
6071 || strncmp (name
, ".tdata.", 7) == 0
6072 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6073 flags
|= SECTION_TLS
;
6075 if (strcmp (name
, ".tbss") == 0
6076 || strncmp (name
, ".tbss.", 6) == 0
6077 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6078 flags
|= SECTION_TLS
| SECTION_BSS
;
6080 /* These three sections have special ELF types. They are neither
6081 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6082 want to print a section type (@progbits or @nobits). If someone
6083 is silly enough to emit code or TLS variables to one of these
6084 sections, then don't handle them specially. */
6085 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6086 && (strcmp (name
, ".init_array") == 0
6087 || strcmp (name
, ".fini_array") == 0
6088 || strcmp (name
, ".preinit_array") == 0))
6089 flags
|= SECTION_NOTYPE
;
6094 /* Return true if the target supports some form of global BSS,
6095 either through bss_noswitch_section, or by selecting a BSS
6096 section in TARGET_ASM_SELECT_SECTION. */
6099 have_global_bss_p (void)
6101 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6104 /* Output assembly to switch to section NAME with attribute FLAGS.
6105 Four variants for common object file formats. */
6108 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6109 unsigned int flags ATTRIBUTE_UNUSED
,
6110 tree decl ATTRIBUTE_UNUSED
)
6112 /* Some object formats don't support named sections at all. The
6113 front-end should already have flagged this as an error. */
6117 #ifndef TLS_SECTION_ASM_FLAG
6118 #define TLS_SECTION_ASM_FLAG 'T'
6122 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6123 tree decl ATTRIBUTE_UNUSED
)
6125 char flagchars
[10], *f
= flagchars
;
6127 /* If we have already declared this section, we can use an
6128 abbreviated form to switch back to it -- unless this section is
6129 part of a COMDAT groups, in which case GAS requires the full
6130 declaration every time. */
6131 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6132 && (flags
& SECTION_DECLARED
))
6134 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6138 if (!(flags
& SECTION_DEBUG
))
6140 if (flags
& SECTION_EXCLUDE
)
6142 if (flags
& SECTION_WRITE
)
6144 if (flags
& SECTION_CODE
)
6146 if (flags
& SECTION_SMALL
)
6148 if (flags
& SECTION_MERGE
)
6150 if (flags
& SECTION_STRINGS
)
6152 if (flags
& SECTION_TLS
)
6153 *f
++ = TLS_SECTION_ASM_FLAG
;
6154 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6158 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6160 if (!(flags
& SECTION_NOTYPE
))
6165 if (flags
& SECTION_BSS
)
6171 /* On platforms that use "@" as the assembly comment character,
6173 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6175 fprintf (asm_out_file
, format
, type
);
6177 if (flags
& SECTION_ENTSIZE
)
6178 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6179 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6181 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6182 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6184 fprintf (asm_out_file
, ",%s,comdat",
6185 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6189 putc ('\n', asm_out_file
);
6193 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6194 tree decl ATTRIBUTE_UNUSED
)
6196 char flagchars
[8], *f
= flagchars
;
6198 if (flags
& SECTION_WRITE
)
6200 if (flags
& SECTION_CODE
)
6204 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6208 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6211 default_coff_asm_named_section (name
, flags
, decl
);
6213 if (flags
& SECTION_LINKONCE
)
6215 /* Functions may have been compiled at various levels of
6216 optimization so we can't use `same_size' here.
6217 Instead, have the linker pick one. */
6218 fprintf (asm_out_file
, "\t.linkonce %s\n",
6219 (flags
& SECTION_CODE
? "discard" : "same_size"));
6223 /* The lame default section selector. */
6226 default_select_section (tree decl
, int reloc
,
6227 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6231 if (decl_readonly_section (decl
, reloc
))
6232 return readonly_data_section
;
6234 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6236 if (! ((flag_pic
&& reloc
)
6237 || !TREE_READONLY (decl
)
6238 || TREE_SIDE_EFFECTS (decl
)
6239 || !TREE_CONSTANT (decl
)))
6240 return readonly_data_section
;
6242 else if (TREE_CODE (decl
) == STRING_CST
)
6243 return readonly_data_section
;
6244 else if (! (flag_pic
&& reloc
))
6245 return readonly_data_section
;
6247 return data_section
;
6250 enum section_category
6251 categorize_decl_for_section (const_tree decl
, int reloc
)
6253 enum section_category ret
;
6255 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6257 else if (TREE_CODE (decl
) == STRING_CST
)
6259 if ((flag_sanitize
& SANITIZE_ADDRESS
)
6260 && asan_protect_global (CONST_CAST_TREE (decl
)))
6261 /* or !flag_merge_constants */
6262 return SECCAT_RODATA
;
6264 return SECCAT_RODATA_MERGE_STR
;
6266 else if (TREE_CODE (decl
) == VAR_DECL
)
6268 if (bss_initializer_p (decl
))
6270 else if (! TREE_READONLY (decl
)
6271 || TREE_SIDE_EFFECTS (decl
)
6272 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6274 /* Here the reloc_rw_mask is not testing whether the section should
6275 be read-only or not, but whether the dynamic link will have to
6276 do something. If so, we wish to segregate the data in order to
6277 minimize cache misses inside the dynamic linker. */
6278 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6279 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6283 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6284 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6285 else if (reloc
|| flag_merge_constants
< 2
6286 || ((flag_sanitize
& SANITIZE_ADDRESS
)
6287 && asan_protect_global (CONST_CAST_TREE (decl
))))
6288 /* C and C++ don't allow different variables to share the same
6289 location. -fmerge-all-constants allows even that (at the
6290 expense of not conforming). */
6291 ret
= SECCAT_RODATA
;
6292 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6293 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6295 ret
= SECCAT_RODATA_MERGE_CONST
;
6297 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6299 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6300 || TREE_SIDE_EFFECTS (decl
)
6301 || ! TREE_CONSTANT (decl
))
6304 ret
= SECCAT_RODATA
;
6307 ret
= SECCAT_RODATA
;
6309 /* There are no read-only thread-local sections. */
6310 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6312 /* Note that this would be *just* SECCAT_BSS, except that there's
6313 no concept of a read-only thread-local-data section. */
6314 if (ret
== SECCAT_BSS
6315 || (flag_zero_initialized_in_bss
6316 && initializer_zerop (DECL_INITIAL (decl
))))
6322 /* If the target uses small data sections, select it. */
6323 else if (targetm
.in_small_data_p (decl
))
6325 if (ret
== SECCAT_BSS
)
6327 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6328 ret
= SECCAT_SRODATA
;
6337 decl_readonly_section_1 (enum section_category category
)
6342 case SECCAT_RODATA_MERGE_STR
:
6343 case SECCAT_RODATA_MERGE_STR_INIT
:
6344 case SECCAT_RODATA_MERGE_CONST
:
6345 case SECCAT_SRODATA
:
6353 decl_readonly_section (const_tree decl
, int reloc
)
6355 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6358 /* Select a section based on the above categorization. */
6361 default_elf_select_section (tree decl
, int reloc
,
6362 unsigned HOST_WIDE_INT align
)
6365 switch (categorize_decl_for_section (decl
, reloc
))
6368 /* We're not supposed to be called on FUNCTION_DECLs. */
6371 return readonly_data_section
;
6372 case SECCAT_RODATA_MERGE_STR
:
6373 return mergeable_string_section (decl
, align
, 0);
6374 case SECCAT_RODATA_MERGE_STR_INIT
:
6375 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6376 case SECCAT_RODATA_MERGE_CONST
:
6377 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6378 case SECCAT_SRODATA
:
6382 return data_section
;
6383 case SECCAT_DATA_REL
:
6384 sname
= ".data.rel";
6386 case SECCAT_DATA_REL_LOCAL
:
6387 sname
= ".data.rel.local";
6389 case SECCAT_DATA_REL_RO
:
6390 sname
= ".data.rel.ro";
6392 case SECCAT_DATA_REL_RO_LOCAL
:
6393 sname
= ".data.rel.ro.local";
6416 return get_named_section (decl
, sname
, reloc
);
6419 /* Construct a unique section name based on the decl name and the
6420 categorization performed above. */
6423 default_unique_section (tree decl
, int reloc
)
6425 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6426 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6427 const char *prefix
, *name
, *linkonce
;
6430 switch (categorize_decl_for_section (decl
, reloc
))
6433 prefix
= one_only
? ".t" : ".text";
6436 case SECCAT_RODATA_MERGE_STR
:
6437 case SECCAT_RODATA_MERGE_STR_INIT
:
6438 case SECCAT_RODATA_MERGE_CONST
:
6439 prefix
= one_only
? ".r" : ".rodata";
6441 case SECCAT_SRODATA
:
6442 prefix
= one_only
? ".s2" : ".sdata2";
6445 prefix
= one_only
? ".d" : ".data";
6447 case SECCAT_DATA_REL
:
6448 prefix
= one_only
? ".d.rel" : ".data.rel";
6450 case SECCAT_DATA_REL_LOCAL
:
6451 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6453 case SECCAT_DATA_REL_RO
:
6454 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6456 case SECCAT_DATA_REL_RO_LOCAL
:
6457 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6460 prefix
= one_only
? ".s" : ".sdata";
6463 prefix
= one_only
? ".b" : ".bss";
6466 prefix
= one_only
? ".sb" : ".sbss";
6469 prefix
= one_only
? ".td" : ".tdata";
6472 prefix
= one_only
? ".tb" : ".tbss";
6478 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
6479 name
= targetm
.strip_name_encoding (name
);
6481 /* If we're using one_only, then there needs to be a .gnu.linkonce
6482 prefix to the section name. */
6483 linkonce
= one_only
? ".gnu.linkonce" : "";
6485 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6487 set_decl_section_name (decl
, string
);
6490 /* Subroutine of compute_reloc_for_rtx for leaf rtxes. */
6493 compute_reloc_for_rtx_1 (const_rtx x
)
6495 switch (GET_CODE (x
))
6498 return SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6506 /* Like compute_reloc_for_constant, except for an RTX. The return value
6507 is a mask for which bit 1 indicates a global relocation, and bit 0
6508 indicates a local relocation. */
6511 compute_reloc_for_rtx (const_rtx x
)
6513 switch (GET_CODE (x
))
6517 return compute_reloc_for_rtx_1 (x
);
6522 subrtx_iterator::array_type array
;
6523 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
6524 reloc
|= compute_reloc_for_rtx_1 (*iter
);
6534 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
6536 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6538 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6539 return data_section
;
6541 return readonly_data_section
;
6545 default_elf_select_rtx_section (enum machine_mode mode
, rtx x
,
6546 unsigned HOST_WIDE_INT align
)
6548 int reloc
= compute_reloc_for_rtx (x
);
6550 /* ??? Handle small data here somehow. */
6552 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6555 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6557 return get_named_section (NULL
, ".data.rel.ro", 3);
6560 return mergeable_constant_section (mode
, align
, 0);
6563 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6566 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6571 /* Careful not to prod global register variables. */
6574 symbol
= XEXP (rtl
, 0);
6575 if (GET_CODE (symbol
) != SYMBOL_REF
)
6578 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6579 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6580 flags
|= SYMBOL_FLAG_FUNCTION
;
6581 if (targetm
.binds_local_p (decl
))
6582 flags
|= SYMBOL_FLAG_LOCAL
;
6583 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6584 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6585 else if (targetm
.in_small_data_p (decl
))
6586 flags
|= SYMBOL_FLAG_SMALL
;
6587 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6588 being PUBLIC, the thing *must* be defined in this translation unit.
6589 Prevent this buglet from being propagated into rtl code as well. */
6590 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6591 flags
|= SYMBOL_FLAG_EXTERNAL
;
6593 SYMBOL_REF_FLAGS (symbol
) = flags
;
6596 /* By default, we do nothing for encode_section_info, so we need not
6597 do anything but discard the '*' marker. */
6600 default_strip_name_encoding (const char *str
)
6602 return str
+ (*str
== '*');
6605 #ifdef ASM_OUTPUT_DEF
6606 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6607 anchor relative to ".", the current section position. */
6610 default_asm_output_anchor (rtx symbol
)
6614 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6615 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6616 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6620 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6623 default_use_anchors_for_symbol_p (const_rtx symbol
)
6628 /* Don't use anchors for mergeable sections. The linker might move
6629 the objects around. */
6630 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6631 if (sect
->common
.flags
& SECTION_MERGE
)
6634 /* Don't use anchors for small data sections. The small data register
6635 acts as an anchor for such sections. */
6636 if (sect
->common
.flags
& SECTION_SMALL
)
6639 decl
= SYMBOL_REF_DECL (symbol
);
6640 if (decl
&& DECL_P (decl
))
6642 /* Don't use section anchors for decls that might be defined or
6643 usurped by other modules. */
6644 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
6647 /* Don't use section anchors for decls that will be placed in a
6648 small data section. */
6649 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6650 one above. The problem is that we only use SECTION_SMALL for
6651 sections that should be marked as small in the section directive. */
6652 if (targetm
.in_small_data_p (decl
))
6658 /* Return true when RESOLUTION indicate that symbol will be bound to the
6659 definition provided by current .o file. */
6662 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6664 return (resolution
== LDPR_PREVAILING_DEF
6665 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6666 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6669 /* Return true when RESOLUTION indicate that symbol will be bound locally
6670 within current executable or DSO. */
6673 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6675 return (resolution
== LDPR_PREVAILING_DEF
6676 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6677 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6678 || resolution
== LDPR_PREEMPTED_REG
6679 || resolution
== LDPR_PREEMPTED_IR
6680 || resolution
== LDPR_RESOLVED_IR
6681 || resolution
== LDPR_RESOLVED_EXEC
);
6684 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6685 wrt cross-module name binding. */
6688 default_binds_local_p (const_tree exp
)
6690 return default_binds_local_p_1 (exp
, flag_shlib
);
6694 default_binds_local_p_1 (const_tree exp
, int shlib
)
6697 bool resolved_locally
= false;
6698 bool resolved_to_local_def
= false;
6700 /* With resolution file in hands, take look into resolutions.
6701 We can't just return true for resolved_locally symbols,
6702 because dynamic linking might overwrite symbols
6703 in shared libraries. */
6704 if (TREE_CODE (exp
) == VAR_DECL
&& TREE_PUBLIC (exp
)
6705 && (TREE_STATIC (exp
) || DECL_EXTERNAL (exp
)))
6707 varpool_node
*vnode
= varpool_node::get (exp
);
6708 if (vnode
&& (resolution_local_p (vnode
->resolution
) || vnode
->in_other_partition
))
6709 resolved_locally
= true;
6711 && resolution_to_local_definition_p (vnode
->resolution
))
6712 resolved_to_local_def
= true;
6714 else if (TREE_CODE (exp
) == FUNCTION_DECL
&& TREE_PUBLIC (exp
))
6716 struct cgraph_node
*node
= cgraph_node::get (exp
);
6718 && (resolution_local_p (node
->resolution
) || node
->in_other_partition
))
6719 resolved_locally
= true;
6721 && resolution_to_local_definition_p (node
->resolution
))
6722 resolved_to_local_def
= true;
6725 /* A non-decl is an entry in the constant pool. */
6728 /* Weakrefs may not bind locally, even though the weakref itself is always
6729 static and therefore local. Similarly, the resolver for ifunc functions
6730 might resolve to a non-local function.
6731 FIXME: We can resolve the weakref case more curefuly by looking at the
6733 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6734 || (TREE_CODE (exp
) == FUNCTION_DECL
6735 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6737 /* Static variables are always local. */
6738 else if (! TREE_PUBLIC (exp
))
6740 /* A variable is local if the user has said explicitly that it will
6742 else if ((DECL_VISIBILITY_SPECIFIED (exp
)
6743 || resolved_to_local_def
)
6744 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6746 /* Variables defined outside this object might not be local. */
6747 else if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6749 /* If defined in this object and visibility is not default, must be
6751 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6753 /* Default visibility weak data can be overridden by a strong symbol
6754 in another module and so are not local. */
6755 else if (DECL_WEAK (exp
)
6756 && !resolved_locally
)
6758 /* If PIC, then assume that any global name can be overridden by
6759 symbols resolved from other modules. */
6762 /* Uninitialized COMMON variable may be unified with symbols
6763 resolved from other modules. */
6764 else if (DECL_COMMON (exp
)
6765 && !resolved_locally
6766 && (DECL_INITIAL (exp
) == NULL
6767 || (!in_lto_p
&& DECL_INITIAL (exp
) == error_mark_node
)))
6769 /* Otherwise we're left with initialized (or non-common) global data
6770 which is of necessity defined locally. */
6777 /* Return true when references to DECL must bind to current definition in
6780 The condition is usually equivalent to whether the function binds to the
6781 current module (shared library or executable), that is to binds_local_p.
6782 We use this fact to avoid need for another target hook and implement
6783 the logic using binds_local_p and just special cases where
6784 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6785 the weak definitions (that can be overwritten at linktime by other
6786 definition from different object file) and when resolution info is available
6787 we simply use the knowledge passed to us by linker plugin. */
6789 decl_binds_to_current_def_p (const_tree decl
)
6791 gcc_assert (DECL_P (decl
));
6792 if (!targetm
.binds_local_p (decl
))
6794 if (!TREE_PUBLIC (decl
))
6796 /* When resolution is available, just use it. */
6797 if (TREE_CODE (decl
) == VAR_DECL
6798 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)))
6800 varpool_node
*vnode
= varpool_node::get (decl
);
6802 && vnode
->resolution
!= LDPR_UNKNOWN
)
6803 return resolution_to_local_definition_p (vnode
->resolution
);
6805 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
6807 struct cgraph_node
*node
= cgraph_node::get (decl
);
6809 && node
->resolution
!= LDPR_UNKNOWN
)
6810 return resolution_to_local_definition_p (node
->resolution
);
6812 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6813 binds locally but still can be overwritten), DECL_COMMON (can be merged
6814 with a non-common definition somewhere in the same module) or
6816 This rely on fact that binds_local_p behave as decl_replaceable_p
6817 for all other declaration types. */
6818 if (DECL_WEAK (decl
))
6820 if (DECL_COMMON (decl
)
6821 && (DECL_INITIAL (decl
) == NULL
6822 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6824 if (DECL_EXTERNAL (decl
))
6829 /* A replaceable function or variable is one which may be replaced
6830 at link-time with an entirely different definition, provided that the
6831 replacement has the same type. For example, functions declared
6832 with __attribute__((weak)) on most systems are replaceable.
6834 COMDAT functions are not replaceable, since all definitions of the
6835 function must be equivalent. It is important that COMDAT functions
6836 not be treated as replaceable so that use of C++ template
6837 instantiations is not penalized. */
6840 decl_replaceable_p (tree decl
)
6842 gcc_assert (DECL_P (decl
));
6843 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
6845 if (!flag_semantic_interposition
6846 && !DECL_WEAK (decl
))
6848 return !decl_binds_to_current_def_p (decl
);
6851 /* Default function to output code that will globalize a label. A
6852 target must define GLOBAL_ASM_OP or provide its own function to
6853 globalize a label. */
6854 #ifdef GLOBAL_ASM_OP
6856 default_globalize_label (FILE * stream
, const char *name
)
6858 fputs (GLOBAL_ASM_OP
, stream
);
6859 assemble_name (stream
, name
);
6860 putc ('\n', stream
);
6862 #endif /* GLOBAL_ASM_OP */
6864 /* Default function to output code that will globalize a declaration. */
6866 default_globalize_decl_name (FILE * stream
, tree decl
)
6868 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6869 targetm
.asm_out
.globalize_label (stream
, name
);
6872 /* Default function to output a label for unwind information. The
6873 default is to do nothing. A target that needs nonlocal labels for
6874 unwind information must provide its own function to do this. */
6876 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6877 tree decl ATTRIBUTE_UNUSED
,
6878 int for_eh ATTRIBUTE_UNUSED
,
6879 int empty ATTRIBUTE_UNUSED
)
6883 /* Default function to output a label to divide up the exception table.
6884 The default is to do nothing. A target that needs/wants to divide
6885 up the table must provide it's own function to do this. */
6887 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
6891 /* This is how to output an internal numbered label where PREFIX is
6892 the class of label and LABELNO is the number within the class. */
6895 default_generate_internal_label (char *buf
, const char *prefix
,
6896 unsigned long labelno
)
6898 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6901 /* This is how to output an internal numbered label where PREFIX is
6902 the class of label and LABELNO is the number within the class. */
6905 default_internal_label (FILE *stream
, const char *prefix
,
6906 unsigned long labelno
)
6908 char *const buf
= (char *) alloca (40 + strlen (prefix
));
6909 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6910 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
6914 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
6917 default_asm_declare_constant_name (FILE *file
, const char *name
,
6918 const_tree exp ATTRIBUTE_UNUSED
,
6919 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
6921 assemble_label (file
, name
);
6924 /* This is the default behavior at the beginning of a file. It's
6925 controlled by two other target-hook toggles. */
6927 default_file_start (void)
6929 if (targetm
.asm_file_start_app_off
6930 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
6931 fputs (ASM_APP_OFF
, asm_out_file
);
6933 if (targetm
.asm_file_start_file_directive
)
6934 output_file_directive (asm_out_file
, main_input_filename
);
6937 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6938 which emits a special section directive used to indicate whether or
6939 not this object file needs an executable stack. This is primarily
6940 a GNU extension to ELF but could be used on other targets. */
6942 int trampolines_created
;
6945 file_end_indicate_exec_stack (void)
6947 unsigned int flags
= SECTION_DEBUG
;
6948 if (trampolines_created
)
6949 flags
|= SECTION_CODE
;
6951 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
6954 /* Emit a special section directive to indicate that this object file
6955 was compiled with -fsplit-stack. This is used to let the linker
6956 detect calls between split-stack code and non-split-stack code, so
6957 that it can modify the split-stack code to allocate a sufficiently
6958 large stack. We emit another special section if there are any
6959 functions in this file which have the no_split_stack attribute, to
6960 prevent the linker from warning about being unable to convert the
6961 functions if they call non-split-stack code. */
6964 file_end_indicate_split_stack (void)
6966 if (flag_split_stack
)
6968 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
6970 if (saw_no_split_stack
)
6971 switch_to_section (get_section (".note.GNU-no-split-stack",
6972 SECTION_DEBUG
, NULL
));
6976 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6977 a get_unnamed_section callback. */
6980 output_section_asm_op (const void *directive
)
6982 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
6985 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6986 the current section is NEW_SECTION. */
6989 switch_to_section (section
*new_section
)
6991 if (in_section
== new_section
)
6994 if (new_section
->common
.flags
& SECTION_FORGET
)
6997 in_section
= new_section
;
6999 switch (SECTION_STYLE (new_section
))
7002 targetm
.asm_out
.named_section (new_section
->named
.name
,
7003 new_section
->named
.common
.flags
,
7004 new_section
->named
.decl
);
7007 case SECTION_UNNAMED
:
7008 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
7011 case SECTION_NOSWITCH
:
7016 new_section
->common
.flags
|= SECTION_DECLARED
;
7019 /* If block symbol SYMBOL has not yet been assigned an offset, place
7020 it at the end of its block. */
7023 place_block_symbol (rtx symbol
)
7025 unsigned HOST_WIDE_INT size
, mask
, offset
;
7026 struct constant_descriptor_rtx
*desc
;
7027 unsigned int alignment
;
7028 struct object_block
*block
;
7031 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7032 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7035 /* Work out the symbol's size and alignment. */
7036 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7038 desc
= SYMBOL_REF_CONSTANT (symbol
);
7039 alignment
= desc
->align
;
7040 size
= GET_MODE_SIZE (desc
->mode
);
7042 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7044 decl
= SYMBOL_REF_DECL (symbol
);
7045 alignment
= DECL_ALIGN (decl
);
7046 size
= get_constant_size (DECL_INITIAL (decl
));
7047 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7048 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7049 && asan_protect_global (DECL_INITIAL (decl
)))
7050 size
+= asan_red_zone_size (size
);
7054 struct symtab_node
*snode
;
7055 decl
= SYMBOL_REF_DECL (symbol
);
7057 snode
= symtab_node::get (decl
);
7060 rtx target
= DECL_RTL (snode
->ultimate_alias_target ()->decl
);
7062 place_block_symbol (target
);
7063 SYMBOL_REF_BLOCK_OFFSET (symbol
) = SYMBOL_REF_BLOCK_OFFSET (target
);
7066 alignment
= get_variable_align (decl
);
7067 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7068 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7069 && asan_protect_global (decl
))
7071 size
+= asan_red_zone_size (size
);
7072 alignment
= MAX (alignment
,
7073 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7077 /* Calculate the object's offset from the start of the block. */
7078 block
= SYMBOL_REF_BLOCK (symbol
);
7079 mask
= alignment
/ BITS_PER_UNIT
- 1;
7080 offset
= (block
->size
+ mask
) & ~mask
;
7081 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7083 /* Record the block's new alignment and size. */
7084 block
->alignment
= MAX (block
->alignment
, alignment
);
7085 block
->size
= offset
+ size
;
7087 vec_safe_push (block
->objects
, symbol
);
7090 /* Return the anchor that should be used to address byte offset OFFSET
7091 from the first object in BLOCK. MODEL is the TLS model used
7095 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7096 enum tls_model model
)
7099 unsigned int begin
, middle
, end
;
7100 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7103 /* Work out the anchor's offset. Use an offset of 0 for the first
7104 anchor so that we don't pessimize the case where we take the address
7105 of a variable at the beginning of the block. This is particularly
7106 useful when a block has only one variable assigned to it.
7108 We try to place anchors RANGE bytes apart, so there can then be
7109 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7110 a ptr_mode offset. With some target settings, the lowest such
7111 anchor might be out of range for the lowest ptr_mode offset;
7112 likewise the highest anchor for the highest offset. Use anchors
7113 at the extreme ends of the ptr_mode range in such cases.
7115 All arithmetic uses unsigned integers in order to avoid
7117 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7118 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7119 range
= max_offset
- min_offset
+ 1;
7124 bias
= 1 << (GET_MODE_BITSIZE (ptr_mode
) - 1);
7127 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7128 delta
-= delta
% range
;
7131 offset
= (HOST_WIDE_INT
) (-delta
);
7135 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7136 delta
-= delta
% range
;
7137 if (delta
> bias
- 1)
7139 offset
= (HOST_WIDE_INT
) delta
;
7143 /* Do a binary search to see if there's already an anchor we can use.
7144 Set BEGIN to the new anchor's index if not. */
7146 end
= vec_safe_length (block
->anchors
);
7147 while (begin
!= end
)
7149 middle
= (end
+ begin
) / 2;
7150 anchor
= (*block
->anchors
)[middle
];
7151 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7153 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7155 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7157 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7163 /* Create a new anchor with a unique label. */
7164 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7165 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7166 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7167 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7169 /* Insert it at index BEGIN. */
7170 vec_safe_insert (block
->anchors
, begin
, anchor
);
7174 /* Output the objects in BLOCK. */
7177 output_object_block (struct object_block
*block
)
7179 struct constant_descriptor_rtx
*desc
;
7181 HOST_WIDE_INT offset
;
7185 if (!block
->objects
)
7188 /* Switch to the section and make sure that the first byte is
7189 suitably aligned. */
7190 switch_to_section (block
->sect
);
7191 assemble_align (block
->alignment
);
7193 /* Define the values of all anchors relative to the current section
7195 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7196 targetm
.asm_out
.output_anchor (symbol
);
7198 /* Output the objects themselves. */
7200 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7202 /* Move to the object's offset, padding with zeros if necessary. */
7203 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7204 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7205 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7207 desc
= SYMBOL_REF_CONSTANT (symbol
);
7208 output_constant_pool_1 (desc
, 1);
7209 offset
+= GET_MODE_SIZE (desc
->mode
);
7211 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7214 decl
= SYMBOL_REF_DECL (symbol
);
7215 assemble_constant_contents (DECL_INITIAL (decl
), XSTR (symbol
, 0),
7217 size
= get_constant_size (DECL_INITIAL (decl
));
7219 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7220 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7221 && asan_protect_global (DECL_INITIAL (decl
)))
7223 size
= asan_red_zone_size (size
);
7224 assemble_zeros (size
);
7231 decl
= SYMBOL_REF_DECL (symbol
);
7232 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7233 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7235 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7236 && asan_protect_global (decl
))
7238 size
= asan_red_zone_size (size
);
7239 assemble_zeros (size
);
7246 /* A htab_traverse callback used to call output_object_block for
7247 each member of object_block_htab. */
7250 output_object_block_htab (void **slot
, void *data ATTRIBUTE_UNUSED
)
7252 output_object_block ((struct object_block
*) (*slot
));
7256 /* Output the definitions of all object_blocks. */
7259 output_object_blocks (void)
7261 htab_traverse (object_block_htab
, output_object_block_htab
, NULL
);
7264 /* This function provides a possible implementation of the
7265 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7266 by -frecord-gcc-switches it creates a new mergeable, string section in the
7267 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7268 contains the switches in ASCII format.
7270 FIXME: This code does not correctly handle double quote characters
7271 that appear inside strings, (it strips them rather than preserving them).
7272 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7273 characters - instead it treats them as sub-string separators. Since
7274 we want to emit NUL strings terminators into the object file we have to use
7278 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7282 case SWITCH_TYPE_PASSED
:
7283 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7284 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7287 case SWITCH_TYPE_DESCRIPTIVE
:
7290 /* Distinguish between invocations where name is NULL. */
7291 static bool started
= false;
7297 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7301 | (SECTION_ENTSIZE
& 1),
7303 switch_to_section (sec
);
7312 /* The return value is currently ignored by the caller, but must be 0.
7313 For -fverbose-asm the return value would be the number of characters
7314 emitted into the assembler file. */
7318 /* Emit text to declare externally defined symbols. It is needed to
7319 properly support non-default visibility. */
7321 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7323 const char *name ATTRIBUTE_UNUSED
)
7325 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7326 set in order to avoid putting out names that are never really
7328 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7329 && targetm
.binds_local_p (decl
))
7330 maybe_assemble_visibility (decl
);
7333 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7336 default_asm_output_source_filename (FILE *file
, const char *name
)
7338 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7339 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7341 fprintf (file
, "\t.file\t");
7342 output_quoted_string (file
, name
);
7347 /* Output a file name in the form wanted by System V. */
7350 output_file_directive (FILE *asm_file
, const char *input_name
)
7355 if (input_name
== NULL
)
7356 input_name
= "<stdin>";
7358 input_name
= remap_debug_filename (input_name
);
7360 len
= strlen (input_name
);
7361 na
= input_name
+ len
;
7363 /* NA gets INPUT_NAME sans directory names. */
7364 while (na
> input_name
)
7366 if (IS_DIR_SEPARATOR (na
[-1]))
7371 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7374 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7377 make_debug_expr_from_rtl (const_rtx exp
)
7379 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7380 enum machine_mode mode
= GET_MODE (exp
);
7383 DECL_ARTIFICIAL (ddecl
) = 1;
7384 if (REG_P (exp
) && REG_EXPR (exp
))
7385 type
= TREE_TYPE (REG_EXPR (exp
));
7386 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7387 type
= TREE_TYPE (MEM_EXPR (exp
));
7390 if (type
&& TYPE_MODE (type
) == mode
)
7391 TREE_TYPE (ddecl
) = type
;
7393 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7394 DECL_MODE (ddecl
) = mode
;
7395 dval
= gen_rtx_DEBUG_EXPR (mode
);
7396 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7397 SET_DECL_RTL (ddecl
, dval
);
7401 #ifdef ELF_ASCII_ESCAPES
7402 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7405 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7410 fputs (STRING_ASM_OP
, f
);
7415 escape
= ELF_ASCII_ESCAPES
[c
];
7422 /* TODO: Print in hex with fast function, important for -flto. */
7423 fprintf (f
, "\\%03o", c
);
7436 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7439 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7441 const char *limit
= s
+ len
;
7442 const char *last_null
= NULL
;
7443 unsigned bytes_in_chunk
= 0;
7447 for (; s
< limit
; s
++)
7451 if (bytes_in_chunk
>= 60)
7460 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7467 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7469 if (bytes_in_chunk
> 0)
7476 default_elf_asm_output_limited_string (f
, s
);
7481 if (bytes_in_chunk
== 0)
7482 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7485 escape
= ELF_ASCII_ESCAPES
[c
];
7493 /* TODO: Print in hex with fast function, important for -flto. */
7494 fprintf (f
, "\\%03o", c
);
7495 bytes_in_chunk
+= 4;
7500 bytes_in_chunk
+= 2;
7507 if (bytes_in_chunk
> 0)
7515 static GTY(()) section
*elf_init_array_section
;
7516 static GTY(()) section
*elf_fini_array_section
;
7519 get_elf_initfini_array_priority_section (int priority
,
7523 if (priority
!= DEFAULT_INIT_PRIORITY
)
7526 sprintf (buf
, "%s.%.5u",
7527 constructor_p
? ".init_array" : ".fini_array",
7529 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7535 if (elf_init_array_section
== NULL
)
7536 elf_init_array_section
7537 = get_section (".init_array",
7538 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7539 sec
= elf_init_array_section
;
7543 if (elf_fini_array_section
== NULL
)
7544 elf_fini_array_section
7545 = get_section (".fini_array",
7546 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7547 sec
= elf_fini_array_section
;
7553 /* Use .init_array section for constructors. */
7556 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7558 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7560 assemble_addr_to_section (symbol
, sec
);
7563 /* Use .fini_array section for destructors. */
7566 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7568 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7570 assemble_addr_to_section (symbol
, sec
);
7573 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7575 This is a bit of a cheat. The real default is a no-op, but this
7576 hook is the default for all targets with a .ident directive. */
7579 default_asm_output_ident_directive (const char *ident_str
)
7581 const char *ident_asm_op
= "\t.ident\t";
7583 /* If we are still in the front end, do not write out the string
7584 to asm_out_file. Instead, add a fake top-level asm statement.
7585 This allows the front ends to use this hook without actually
7586 writing to asm_out_file, to handle #ident or Pragma Ident. */
7587 if (symtab
->state
== PARSING
)
7589 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7590 symtab
->finalize_toplevel_asm (build_string (strlen (buf
), buf
));
7593 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7596 #include "gt-varasm.h"