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"
42 #include "hard-reg-set.h"
48 #include "diagnostic-core.h"
50 #include "langhooks.h"
54 #include "common/common-target.h"
55 #include "targhooks.h"
58 #include "basic-block.h"
61 #ifdef XCOFF_DEBUGGING_INFO
62 #include "xcoffout.h" /* Needed for external data
63 declarations for e.g. AIX 4.x. */
66 /* The (assembler) name of the first globally-visible object output. */
67 extern GTY(()) const char *first_global_object_name
;
68 extern GTY(()) const char *weak_global_object_name
;
70 const char *first_global_object_name
;
71 const char *weak_global_object_name
;
74 struct constant_descriptor_rtx
;
75 struct rtx_constant_pool
;
77 #define n_deferred_constants (crtl->varasm.deferred_constants)
79 /* Number for making the label on the next
80 constant that is stored in memory. */
82 static GTY(()) int const_labelno
;
84 /* Carry information from ASM_DECLARE_OBJECT_NAME
85 to ASM_FINISH_DECLARE_OBJECT. */
87 int size_directive_output
;
89 /* The last decl for which assemble_variable was called,
90 if it did ASM_DECLARE_OBJECT_NAME.
91 If the last call to assemble_variable didn't do that,
94 tree last_assemble_variable_decl
;
96 /* The following global variable indicates if the first basic block
97 in a function belongs to the cold partition or not. */
99 bool first_function_block_is_cold
;
101 /* We give all constants their own alias set. Perhaps redundant with
102 MEM_READONLY_P, but pre-dates it. */
104 static alias_set_type const_alias_set
;
106 /* Whether we saw any functions with no_split_stack. */
108 static bool saw_no_split_stack
;
110 static const char *strip_reg_name (const char *);
111 static int contains_pointers_p (tree
);
112 #ifdef ASM_OUTPUT_EXTERNAL
113 static bool incorporeal_function_p (tree
);
115 static void decode_addr_const (tree
, struct addr_const
*);
116 static hashval_t
const_hash_1 (const tree
);
117 static int compare_constant (const tree
, const tree
);
118 static void output_constant_def_contents (rtx
);
119 static void output_addressed_constants (tree
);
120 static unsigned HOST_WIDE_INT
output_constant (tree
, unsigned HOST_WIDE_INT
,
122 static void globalize_decl (tree
);
123 static bool decl_readonly_section_1 (enum section_category
);
124 #ifdef BSS_SECTION_ASM_OP
125 #ifdef ASM_OUTPUT_ALIGNED_BSS
126 static void asm_output_aligned_bss (FILE *, tree
, const char *,
127 unsigned HOST_WIDE_INT
, int)
130 #endif /* BSS_SECTION_ASM_OP */
131 static void mark_weak (tree
);
132 static void output_constant_pool (const char *, tree
);
134 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
135 section
*text_section
;
136 section
*data_section
;
137 section
*readonly_data_section
;
138 section
*sdata_section
;
139 section
*ctors_section
;
140 section
*dtors_section
;
141 section
*bss_section
;
142 section
*sbss_section
;
144 /* Various forms of common section. All are guaranteed to be nonnull. */
145 section
*tls_comm_section
;
146 section
*comm_section
;
147 section
*lcomm_section
;
149 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
151 section
*bss_noswitch_section
;
153 /* The section that holds the main exception table, when known. The section
154 is set either by the target's init_sections hook or by the first call to
155 switch_to_exception_section. */
156 section
*exception_section
;
158 /* The section that holds the DWARF2 frame unwind information, when known.
159 The section is set either by the target's init_sections hook or by the
160 first call to switch_to_eh_frame_section. */
161 section
*eh_frame_section
;
163 /* asm_out_file's current section. This is NULL if no section has yet
164 been selected or if we lose track of what the current section is. */
167 /* True if code for the current function is currently being directed
168 at the cold section. */
169 bool in_cold_section_p
;
171 /* A linked list of all the unnamed sections. */
172 static GTY(()) section
*unnamed_sections
;
174 /* Return a nonzero value if DECL has a section attribute. */
175 #define IN_NAMED_SECTION(DECL) \
176 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
177 && DECL_SECTION_NAME (DECL) != NULL)
179 struct section_hasher
: ggc_hasher
<section
*>
181 typedef const char *compare_type
;
183 static hashval_t
hash (section
*);
184 static bool equal (section
*, const char *);
187 /* Hash table of named sections. */
188 static GTY(()) hash_table
<section_hasher
> *section_htab
;
190 struct object_block_hasher
: ggc_hasher
<object_block
*>
192 typedef const section
*compare_type
;
194 static hashval_t
hash (object_block
*);
195 static bool equal (object_block
*, const section
*);
198 /* A table of object_blocks, indexed by section. */
199 static GTY(()) hash_table
<object_block_hasher
> *object_block_htab
;
201 /* The next number to use for internal anchor labels. */
202 static GTY(()) int anchor_labelno
;
204 /* A pool of constants that can be shared between functions. */
205 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
207 /* Helper routines for maintaining section_htab. */
210 section_hasher::equal (section
*old
, const char *new_name
)
212 return strcmp (old
->named
.name
, new_name
) == 0;
216 section_hasher::hash (section
*old
)
218 return htab_hash_string (old
->named
.name
);
221 /* Return a hash value for section SECT. */
224 hash_section (section
*sect
)
226 if (sect
->common
.flags
& SECTION_NAMED
)
227 return htab_hash_string (sect
->named
.name
);
228 return sect
->common
.flags
;
231 /* Helper routines for maintaining object_block_htab. */
234 object_block_hasher::equal (object_block
*old
, const section
*new_section
)
236 return old
->sect
== new_section
;
240 object_block_hasher::hash (object_block
*old
)
242 return hash_section (old
->sect
);
245 /* Return a new unnamed section with the given fields. */
248 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
253 sect
= ggc_alloc
<section
> ();
254 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
255 sect
->unnamed
.callback
= callback
;
256 sect
->unnamed
.data
= data
;
257 sect
->unnamed
.next
= unnamed_sections
;
259 unnamed_sections
= sect
;
263 /* Return a SECTION_NOSWITCH section with the given fields. */
266 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
270 sect
= ggc_alloc
<section
> ();
271 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
272 sect
->noswitch
.callback
= callback
;
277 /* Return the named section structure associated with NAME. Create
278 a new section with the given fields if no such structure exists. */
281 get_section (const char *name
, unsigned int flags
, tree decl
)
283 section
*sect
, **slot
;
285 slot
= section_htab
->find_slot_with_hash (name
, htab_hash_string (name
),
287 flags
|= SECTION_NAMED
;
290 sect
= ggc_alloc
<section
> ();
291 sect
->named
.common
.flags
= flags
;
292 sect
->named
.name
= ggc_strdup (name
);
293 sect
->named
.decl
= decl
;
299 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
300 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
302 /* It is fine if one of the section flags is
303 SECTION_WRITE | SECTION_RELRO and the other has none of these
304 flags (i.e. read-only) in named sections and either the
305 section hasn't been declared yet or has been declared as writable.
306 In that case just make sure the resulting flags are
307 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
309 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
310 == (SECTION_WRITE
| SECTION_RELRO
)
311 && (sect
->common
.flags
312 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
313 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
314 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
315 || (sect
->common
.flags
& SECTION_WRITE
)))
317 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
320 /* Sanity check user variables for flag changes. */
321 if (sect
->named
.decl
!= NULL
322 && DECL_P (sect
->named
.decl
)
323 && decl
!= sect
->named
.decl
)
325 if (decl
!= NULL
&& DECL_P (decl
))
326 error ("%+D causes a section type conflict with %D",
327 decl
, sect
->named
.decl
);
329 error ("section type conflict with %D", sect
->named
.decl
);
330 inform (DECL_SOURCE_LOCATION (sect
->named
.decl
),
331 "%qD was declared here", sect
->named
.decl
);
333 else if (decl
!= NULL
&& DECL_P (decl
))
334 error ("%+D causes a section type conflict", decl
);
336 error ("section type conflict");
337 /* Make sure we don't error about one section multiple times. */
338 sect
->common
.flags
|= SECTION_OVERRIDE
;
344 /* Return true if the current compilation mode benefits from having
345 objects grouped into blocks. */
348 use_object_blocks_p (void)
350 return flag_section_anchors
;
353 /* Return the object_block structure for section SECT. Create a new
354 structure if we haven't created one already. Return null if SECT
357 static struct object_block
*
358 get_block_for_section (section
*sect
)
360 struct object_block
*block
;
366 = object_block_htab
->find_slot_with_hash (sect
, hash_section (sect
),
371 block
= ggc_cleared_alloc
<object_block
> ();
378 /* Create a symbol with label LABEL and place it at byte offset
379 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
380 is not yet known. LABEL must be a garbage-collected string. */
383 create_block_symbol (const char *label
, struct object_block
*block
,
384 HOST_WIDE_INT offset
)
389 /* Create the extended SYMBOL_REF. */
390 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
391 symbol
= (rtx
) ggc_internal_alloc (size
);
393 /* Initialize the normal SYMBOL_REF fields. */
394 memset (symbol
, 0, size
);
395 PUT_CODE (symbol
, SYMBOL_REF
);
396 PUT_MODE (symbol
, Pmode
);
397 XSTR (symbol
, 0) = label
;
398 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
400 /* Initialize the block_symbol stuff. */
401 SYMBOL_REF_BLOCK (symbol
) = block
;
402 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
407 /* Return a section with a particular name and with whatever SECTION_*
408 flags section_type_flags deems appropriate. The name of the section
409 is taken from NAME if nonnull, otherwise it is taken from DECL's
410 DECL_SECTION_NAME. DECL is the decl associated with the section
411 (see the section comment for details) and RELOC is as for
412 section_type_flags. */
415 get_named_section (tree decl
, const char *name
, int reloc
)
421 gcc_assert (decl
&& DECL_P (decl
) && DECL_SECTION_NAME (decl
));
422 name
= DECL_SECTION_NAME (decl
);
425 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
426 return get_section (name
, flags
, decl
);
429 /* Worker for resolve_unique_section. */
432 set_implicit_section (struct symtab_node
*n
, void *data ATTRIBUTE_UNUSED
)
434 n
->implicit_section
= true;
438 /* If required, set DECL_SECTION_NAME to a unique name. */
441 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
442 int flag_function_or_data_sections
)
444 if (DECL_SECTION_NAME (decl
) == NULL
445 && targetm_common
.have_named_sections
446 && (flag_function_or_data_sections
447 || DECL_COMDAT_GROUP (decl
)))
449 targetm
.asm_out
.unique_section (decl
, reloc
);
450 if (DECL_SECTION_NAME (decl
))
451 symtab_node::get (decl
)->call_for_symbol_and_aliases
452 (set_implicit_section
, NULL
, true);
456 #ifdef BSS_SECTION_ASM_OP
458 #ifdef ASM_OUTPUT_ALIGNED_BSS
460 /* Utility function for targets to use in implementing
461 ASM_OUTPUT_ALIGNED_BSS.
462 ??? It is believed that this function will work in most cases so such
463 support is localized here. */
466 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
467 const char *name
, unsigned HOST_WIDE_INT size
,
470 switch_to_section (bss_section
);
471 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
472 #ifdef ASM_DECLARE_OBJECT_NAME
473 last_assemble_variable_decl
= decl
;
474 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
476 /* Standard thing is just output label for the object. */
477 ASM_OUTPUT_LABEL (file
, name
);
478 #endif /* ASM_DECLARE_OBJECT_NAME */
479 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
484 #endif /* BSS_SECTION_ASM_OP */
486 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
487 /* Return the hot section for function DECL. Return text_section for
491 hot_function_section (tree decl
)
493 if (decl
!= NULL_TREE
494 && DECL_SECTION_NAME (decl
) != NULL
495 && targetm_common
.have_named_sections
)
496 return get_named_section (decl
, NULL
, 0);
502 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
505 When DECL_SECTION_NAME is non-NULL and it is implicit section and
506 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
507 concatenate the name with NAMED_SECTION_SUFFIX.
508 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
511 get_named_text_section (tree decl
,
512 const char *text_section_name
,
513 const char *named_section_suffix
)
515 if (decl
&& DECL_SECTION_NAME (decl
))
517 if (named_section_suffix
)
519 const char *dsn
= DECL_SECTION_NAME (decl
);
520 const char *stripped_name
;
523 name
= (char *) alloca (strlen (dsn
) + 1);
527 stripped_name
= targetm
.strip_name_encoding (name
);
529 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
530 return get_named_section (decl
, buffer
, 0);
532 else if (symtab_node::get (decl
)->implicit_section
)
536 /* Do not try to split gnu_linkonce functions. This gets somewhat
538 if (DECL_COMDAT_GROUP (decl
) && !HAVE_COMDAT_GROUP
)
540 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
541 name
= targetm
.strip_name_encoding (name
);
542 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
548 return get_named_section (decl
, text_section_name
, 0);
551 /* Choose named function section based on its frequency. */
554 default_function_section (tree decl
, enum node_frequency freq
,
555 bool startup
, bool exit
)
557 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
558 /* Old GNU linkers have buggy --gc-section support, which sometimes
559 results in .gcc_except_table* sections being garbage collected. */
561 && symtab_node::get (decl
)->implicit_section
)
565 if (!flag_reorder_functions
566 || !targetm_common
.have_named_sections
)
568 /* Startup code should go to startup subsection unless it is
569 unlikely executed (this happens especially with function splitting
570 where we can split away unnecessary parts of static constructors. */
571 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
573 /* If we do have a profile or(and) LTO phase is executed, we do not need
574 these ELF section. */
575 if (!in_lto_p
|| !flag_profile_values
)
576 return get_named_text_section (decl
, ".text.startup", NULL
);
581 /* Similarly for exit. */
582 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
583 return get_named_text_section (decl
, ".text.exit", NULL
);
585 /* Group cold functions together, similarly for hot code. */
588 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
589 return get_named_text_section (decl
, ".text.unlikely", NULL
);
590 case NODE_FREQUENCY_HOT
:
591 /* If we do have a profile or(and) LTO phase is executed, we do not need
592 these ELF section. */
593 if (!in_lto_p
|| !flag_profile_values
)
594 return get_named_text_section (decl
, ".text.hot", NULL
);
600 /* Return the section for function DECL.
602 If DECL is NULL_TREE, return the text section. We can be passed
603 NULL_TREE under some circumstances by dbxout.c at least.
605 If FORCE_COLD is true, return cold function section ignoring
606 the frequency info of cgraph_node. */
609 function_section_1 (tree decl
, bool force_cold
)
611 section
*section
= NULL
;
612 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
613 bool startup
= false, exit
= false;
617 struct cgraph_node
*node
= cgraph_node::get (decl
);
621 freq
= node
->frequency
;
622 startup
= node
->only_called_at_startup
;
623 exit
= node
->only_called_at_exit
;
627 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
629 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
630 if (decl
!= NULL_TREE
631 && DECL_SECTION_NAME (decl
) != NULL
)
633 if (targetm
.asm_out
.function_section
)
634 section
= targetm
.asm_out
.function_section (decl
, freq
,
638 return get_named_section (decl
, NULL
, 0);
641 return targetm
.asm_out
.select_section
642 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
645 if (targetm
.asm_out
.function_section
)
646 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
649 return hot_function_section (decl
);
653 /* Return the section for function DECL.
655 If DECL is NULL_TREE, return the text section. We can be passed
656 NULL_TREE under some circumstances by dbxout.c at least. */
659 function_section (tree decl
)
661 /* Handle cases where function splitting code decides
662 to put function entry point into unlikely executed section
663 despite the fact that the function itself is not cold
664 (i.e. it is called rarely but contains a hot loop that is
665 better to live in hot subsection for the code locality). */
666 return function_section_1 (decl
,
667 first_function_block_is_cold
);
670 /* Return the section for the current function, take IN_COLD_SECTION_P
674 current_function_section (void)
676 return function_section_1 (current_function_decl
, in_cold_section_p
);
679 /* Tell assembler to switch to unlikely-to-be-executed text section. */
682 unlikely_text_section (void)
684 return function_section_1 (current_function_decl
, true);
687 /* When called within a function context, return true if the function
688 has been assigned a cold text section and if SECT is that section.
689 When called outside a function context, return true if SECT is the
690 default cold section. */
693 unlikely_text_section_p (section
*sect
)
695 return sect
== function_section_1 (current_function_decl
, true);
698 /* Return the read-only data section associated with function DECL. */
701 default_function_rodata_section (tree decl
)
703 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
705 const char *name
= DECL_SECTION_NAME (decl
);
707 if (DECL_COMDAT_GROUP (decl
) && HAVE_COMDAT_GROUP
)
713 dot
= strchr (name
+ 1, '.');
716 len
= strlen (dot
) + 8;
717 rname
= (char *) alloca (len
);
719 strcpy (rname
, ".rodata");
721 return get_section (rname
, SECTION_LINKONCE
, decl
);
723 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
724 else if (DECL_COMDAT_GROUP (decl
)
725 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
727 size_t len
= strlen (name
) + 1;
728 char *rname
= (char *) alloca (len
);
730 memcpy (rname
, name
, len
);
732 return get_section (rname
, SECTION_LINKONCE
, decl
);
734 /* For .text.foo we want to use .rodata.foo. */
735 else if (flag_function_sections
&& flag_data_sections
736 && strncmp (name
, ".text.", 6) == 0)
738 size_t len
= strlen (name
) + 1;
739 char *rname
= (char *) alloca (len
+ 2);
741 memcpy (rname
, ".rodata", 7);
742 memcpy (rname
+ 7, name
+ 5, len
- 5);
743 return get_section (rname
, 0, decl
);
747 return readonly_data_section
;
750 /* Return the read-only data section associated with function DECL
751 for targets where that section should be always the single
752 readonly data section. */
755 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
757 return readonly_data_section
;
760 /* Return the section to use for string merging. */
763 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
764 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
765 unsigned int flags ATTRIBUTE_UNUSED
)
769 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
770 && TREE_CODE (decl
) == STRING_CST
771 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
773 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
774 && TREE_STRING_LENGTH (decl
) >= len
)
776 enum machine_mode mode
;
777 unsigned int modesize
;
781 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
782 char *name
= (char *) alloca (strlen (prefix
) + 30);
784 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
785 modesize
= GET_MODE_BITSIZE (mode
);
786 if (modesize
>= 8 && modesize
<= 256
787 && (modesize
& (modesize
- 1)) == 0)
789 if (align
< modesize
)
792 str
= TREE_STRING_POINTER (decl
);
793 unit
= GET_MODE_SIZE (mode
);
795 /* Check for embedded NUL characters. */
796 for (i
= 0; i
< len
; i
+= unit
)
798 for (j
= 0; j
< unit
; j
++)
799 if (str
[i
+ j
] != '\0')
806 sprintf (name
, "%s.str%d.%d", prefix
,
807 modesize
/ 8, (int) (align
/ 8));
808 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
809 return get_section (name
, flags
, NULL
);
814 return readonly_data_section
;
817 /* Return the section to use for constant merging. */
820 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
821 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
822 unsigned int flags ATTRIBUTE_UNUSED
)
824 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
826 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
832 && (align
& (align
- 1)) == 0)
834 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
835 char *name
= (char *) alloca (strlen (prefix
) + 30);
837 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
838 flags
|= (align
/ 8) | SECTION_MERGE
;
839 return get_section (name
, flags
, NULL
);
841 return readonly_data_section
;
844 /* Given NAME, a putative register name, discard any customary prefixes. */
847 strip_reg_name (const char *name
)
849 #ifdef REGISTER_PREFIX
850 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
851 name
+= strlen (REGISTER_PREFIX
);
853 if (name
[0] == '%' || name
[0] == '#')
858 /* The user has asked for a DECL to have a particular name. Set (or
859 change) it in such a way that we don't prefix an underscore to
862 set_user_assembler_name (tree decl
, const char *name
)
864 char *starred
= (char *) alloca (strlen (name
) + 2);
866 strcpy (starred
+ 1, name
);
867 symtab
->change_decl_assembler_name (decl
, get_identifier (starred
));
868 SET_DECL_RTL (decl
, NULL_RTX
);
871 /* Decode an `asm' spec for a declaration as a register name.
872 Return the register number, or -1 if nothing specified,
873 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
874 or -3 if ASMSPEC is `cc' and is not recognized,
875 or -4 if ASMSPEC is `memory' and is not recognized.
876 Accept an exact spelling or a decimal number.
877 Prefixes such as % are optional. */
880 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
882 /* Presume just one register is clobbered. */
889 /* Get rid of confusing prefixes. */
890 asmspec
= strip_reg_name (asmspec
);
892 /* Allow a decimal number as a "register name". */
893 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
894 if (! ISDIGIT (asmspec
[i
]))
896 if (asmspec
[0] != 0 && i
< 0)
899 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0 && reg_names
[i
][0])
905 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
907 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
910 #ifdef OVERLAPPING_REGISTER_NAMES
914 const char *const name
;
917 } table
[] = OVERLAPPING_REGISTER_NAMES
;
919 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
921 && ! strcmp (asmspec
, table
[i
].name
))
923 *pnregs
= table
[i
].nregs
;
924 return table
[i
].number
;
927 #endif /* OVERLAPPING_REGISTER_NAMES */
929 #ifdef ADDITIONAL_REGISTER_NAMES
931 static const struct { const char *const name
; const int number
; } table
[]
932 = ADDITIONAL_REGISTER_NAMES
;
934 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
936 && ! strcmp (asmspec
, table
[i
].name
)
937 && reg_names
[table
[i
].number
][0])
938 return table
[i
].number
;
940 #endif /* ADDITIONAL_REGISTER_NAMES */
942 if (!strcmp (asmspec
, "memory"))
945 if (!strcmp (asmspec
, "cc"))
955 decode_reg_name (const char *name
)
958 return decode_reg_name_and_count (name
, &count
);
962 /* Return true if DECL's initializer is suitable for a BSS section. */
965 bss_initializer_p (const_tree decl
)
967 return (DECL_INITIAL (decl
) == NULL
968 /* In LTO we have no errors in program; error_mark_node is used
969 to mark offlined constructors. */
970 || (DECL_INITIAL (decl
) == error_mark_node
972 || (flag_zero_initialized_in_bss
973 /* Leave constant zeroes in .rodata so they
975 && !TREE_READONLY (decl
)
976 && initializer_zerop (DECL_INITIAL (decl
))));
979 /* Compute the alignment of variable specified by DECL.
980 DONT_OUTPUT_DATA is from assemble_variable. */
983 align_variable (tree decl
, bool dont_output_data
)
985 unsigned int align
= DECL_ALIGN (decl
);
987 /* In the case for initialing an array whose length isn't specified,
988 where we have not yet been able to do the layout,
989 figure out the proper alignment now. */
990 if (dont_output_data
&& DECL_SIZE (decl
) == 0
991 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
992 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
994 /* Some object file formats have a maximum alignment which they support.
995 In particular, a.out format supports a maximum alignment of 4. */
996 if (align
> MAX_OFILE_ALIGNMENT
)
998 error ("alignment of %q+D is greater than maximum object "
999 "file alignment %d", decl
,
1000 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
1001 align
= MAX_OFILE_ALIGNMENT
;
1004 if (! DECL_USER_ALIGN (decl
))
1006 #ifdef DATA_ABI_ALIGNMENT
1007 unsigned int data_abi_align
1008 = DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1009 /* For backwards compatibility, don't assume the ABI alignment for
1011 if (! DECL_THREAD_LOCAL_P (decl
) || data_abi_align
<= BITS_PER_WORD
)
1012 align
= data_abi_align
;
1015 /* On some machines, it is good to increase alignment sometimes.
1016 But as DECL_ALIGN is used both for actually emitting the variable
1017 and for code accessing the variable as guaranteed alignment, we
1018 can only increase the alignment if it is a performance optimization
1019 if the references to it must bind to the current definition. */
1020 if (decl_binds_to_current_def_p (decl
)
1021 && !DECL_VIRTUAL_P (decl
))
1023 #ifdef DATA_ALIGNMENT
1024 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1025 /* Don't increase alignment too much for TLS variables - TLS space
1027 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1030 #ifdef CONSTANT_ALIGNMENT
1031 if (DECL_INITIAL (decl
) != 0
1032 /* In LTO we have no errors in program; error_mark_node is used
1033 to mark offlined constructors. */
1034 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1036 unsigned int const_align
1037 = CONSTANT_ALIGNMENT (DECL_INITIAL (decl
), align
);
1038 /* Don't increase alignment too much for TLS variables - TLS
1039 space is too precious. */
1040 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1041 align
= const_align
;
1047 /* Reset the alignment in case we have made it tighter, so we can benefit
1048 from it in get_pointer_alignment. */
1049 DECL_ALIGN (decl
) = align
;
1052 /* Return DECL_ALIGN (decl), possibly increased for optimization purposes
1053 beyond what align_variable returned. */
1056 get_variable_align (tree decl
)
1058 unsigned int align
= DECL_ALIGN (decl
);
1060 /* For user aligned vars or static vars align_variable already did
1062 if (DECL_USER_ALIGN (decl
) || !TREE_PUBLIC (decl
))
1065 #ifdef DATA_ABI_ALIGNMENT
1066 if (DECL_THREAD_LOCAL_P (decl
))
1067 align
= DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1070 /* For decls that bind to the current definition, align_variable
1071 did also everything, except for not assuming ABI required alignment
1072 of TLS variables. For other vars, increase the alignment here
1073 as an optimization. */
1074 if (!decl_binds_to_current_def_p (decl
))
1076 /* On some machines, it is good to increase alignment sometimes. */
1077 #ifdef DATA_ALIGNMENT
1078 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1079 /* Don't increase alignment too much for TLS variables - TLS space
1081 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1084 #ifdef CONSTANT_ALIGNMENT
1085 if (DECL_INITIAL (decl
) != 0
1086 /* In LTO we have no errors in program; error_mark_node is used
1087 to mark offlined constructors. */
1088 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1090 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
1092 /* Don't increase alignment too much for TLS variables - TLS space
1094 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1095 align
= const_align
;
1103 /* Return the section into which the given VAR_DECL or CONST_DECL
1104 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1105 section should be used wherever possible. */
1108 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1110 addr_space_t as
= ADDR_SPACE_GENERIC
;
1112 varpool_node
*vnode
= varpool_node::get (decl
);
1115 vnode
= vnode
->ultimate_alias_target ();
1119 if (TREE_TYPE (decl
) != error_mark_node
)
1120 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1122 /* We need the constructor to figure out reloc flag. */
1124 vnode
->get_constructor ();
1126 if (DECL_COMMON (decl
))
1128 /* If the decl has been given an explicit section name, or it resides
1129 in a non-generic address space, then it isn't common, and shouldn't
1130 be handled as such. */
1131 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1132 && ADDR_SPACE_GENERIC_P (as
));
1133 if (DECL_THREAD_LOCAL_P (decl
))
1134 return tls_comm_section
;
1135 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1136 return comm_section
;
1139 if (DECL_INITIAL (decl
) == error_mark_node
)
1140 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1141 else if (DECL_INITIAL (decl
))
1142 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1146 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1147 if (IN_NAMED_SECTION (decl
))
1148 return get_named_section (decl
, NULL
, reloc
);
1150 if (ADDR_SPACE_GENERIC_P (as
)
1151 && !DECL_THREAD_LOCAL_P (decl
)
1152 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1153 && bss_initializer_p (decl
))
1155 if (!TREE_PUBLIC (decl
)
1156 && !((flag_sanitize
& SANITIZE_ADDRESS
)
1157 && asan_protect_global (decl
)))
1158 return lcomm_section
;
1159 if (bss_noswitch_section
)
1160 return bss_noswitch_section
;
1163 return targetm
.asm_out
.select_section (decl
, reloc
,
1164 get_variable_align (decl
));
1167 /* Return the block into which object_block DECL should be placed. */
1169 static struct object_block
*
1170 get_block_for_decl (tree decl
)
1174 if (TREE_CODE (decl
) == VAR_DECL
)
1176 /* The object must be defined in this translation unit. */
1177 if (DECL_EXTERNAL (decl
))
1180 /* There's no point using object blocks for something that is
1181 isolated by definition. */
1182 if (DECL_COMDAT_GROUP (decl
))
1186 /* We can only calculate block offsets if the decl has a known
1188 if (DECL_SIZE_UNIT (decl
) == NULL
)
1190 if (!tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
)))
1193 /* Find out which section should contain DECL. We cannot put it into
1194 an object block if it requires a standalone definition. */
1195 if (TREE_CODE (decl
) == VAR_DECL
)
1196 align_variable (decl
, 0);
1197 sect
= get_variable_section (decl
, true);
1198 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1201 return get_block_for_section (sect
);
1204 /* Make sure block symbol SYMBOL is in block BLOCK. */
1207 change_symbol_block (rtx symbol
, struct object_block
*block
)
1209 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1211 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1212 SYMBOL_REF_BLOCK (symbol
) = block
;
1216 /* Return true if it is possible to put DECL in an object_block. */
1219 use_blocks_for_decl_p (tree decl
)
1221 struct symtab_node
*snode
;
1223 /* Only data DECLs can be placed into object blocks. */
1224 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1227 /* Detect decls created by dw2_force_const_mem. Such decls are
1228 special because DECL_INITIAL doesn't specify the decl's true value.
1229 dw2_output_indirect_constants will instead call assemble_variable
1230 with dont_output_data set to 1 and then print the contents itself. */
1231 if (DECL_INITIAL (decl
) == decl
)
1234 /* If this decl is an alias, then we don't want to emit a
1236 if (TREE_CODE (decl
) == VAR_DECL
1237 && (snode
= symtab_node::get (decl
)) != NULL
1241 return targetm
.use_blocks_for_decl_p (decl
);
1244 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1245 have static storage duration. In other words, it should not be an
1246 automatic variable, including PARM_DECLs.
1248 There is, however, one exception: this function handles variables
1249 explicitly placed in a particular register by the user.
1251 This is never called for PARM_DECL nodes. */
1254 make_decl_rtl (tree decl
)
1256 const char *name
= 0;
1260 /* Check that we are not being given an automatic variable. */
1261 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1262 && TREE_CODE (decl
) != RESULT_DECL
);
1264 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1265 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1266 || TREE_STATIC (decl
)
1267 || TREE_PUBLIC (decl
)
1268 || DECL_EXTERNAL (decl
)
1269 || DECL_REGISTER (decl
));
1271 /* And that we were not given a type or a label. */
1272 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1273 && TREE_CODE (decl
) != LABEL_DECL
);
1275 /* For a duplicate declaration, we can be called twice on the
1276 same DECL node. Don't discard the RTL already made. */
1277 if (DECL_RTL_SET_P (decl
))
1279 /* If the old RTL had the wrong mode, fix the mode. */
1280 x
= DECL_RTL (decl
);
1281 if (GET_MODE (x
) != DECL_MODE (decl
))
1282 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1284 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1287 /* ??? Another way to do this would be to maintain a hashed
1288 table of such critters. Instead of adding stuff to a DECL
1289 to give certain attributes to it, we could use an external
1290 hash map from DECL to set of attributes. */
1292 /* Let the target reassign the RTL if it wants.
1293 This is necessary, for example, when one machine specific
1294 decl attribute overrides another. */
1295 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1297 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1298 on the new decl information. */
1300 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1301 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1302 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1307 /* If this variable belongs to the global constant pool, retrieve the
1308 pre-computed RTL or recompute it in LTO mode. */
1309 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_IN_CONSTANT_POOL (decl
))
1311 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1315 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
1317 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1318 && DECL_REGISTER (decl
))
1320 error ("register name not specified for %q+D", decl
);
1322 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1324 const char *asmspec
= name
+1;
1325 enum machine_mode mode
= DECL_MODE (decl
);
1326 reg_number
= decode_reg_name (asmspec
);
1327 /* First detect errors in declaring global registers. */
1328 if (reg_number
== -1)
1329 error ("register name not specified for %q+D", decl
);
1330 else if (reg_number
< 0)
1331 error ("invalid register name for %q+D", decl
);
1332 else if (mode
== BLKmode
)
1333 error ("data type of %q+D isn%'t suitable for a register",
1335 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1336 error ("the register specified for %q+D cannot be accessed"
1337 " by the current target", decl
);
1338 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1339 error ("the register specified for %q+D is not general enough"
1340 " to be used as a register variable", decl
);
1341 else if (!HARD_REGNO_MODE_OK (reg_number
, mode
))
1342 error ("register specified for %q+D isn%'t suitable for data type",
1344 /* Now handle properly declared static register variables. */
1349 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1351 DECL_INITIAL (decl
) = 0;
1352 error ("global register variable has initial value");
1354 if (TREE_THIS_VOLATILE (decl
))
1355 warning (OPT_Wvolatile_register_var
,
1356 "optimization may eliminate reads and/or "
1357 "writes to register variables");
1359 /* If the user specified one of the eliminables registers here,
1360 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1361 confused with that register and be eliminated. This usage is
1362 somewhat suspect... */
1364 SET_DECL_RTL (decl
, gen_rtx_raw_REG (mode
, reg_number
));
1365 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1366 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1368 if (TREE_STATIC (decl
))
1370 /* Make this register global, so not usable for anything
1372 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1373 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1374 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1376 nregs
= hard_regno_nregs
[reg_number
][mode
];
1378 globalize_reg (decl
, reg_number
+ --nregs
);
1381 /* As a register variable, it has no section. */
1384 /* Avoid internal errors from invalid register
1386 SET_DECL_ASSEMBLER_NAME (decl
, NULL_TREE
);
1387 DECL_HARD_REGISTER (decl
) = 0;
1390 /* Now handle ordinary static variables and functions (in memory).
1391 Also handle vars declared register invalidly. */
1392 else if (name
[0] == '*')
1394 #ifdef REGISTER_PREFIX
1395 if (strlen (REGISTER_PREFIX
) != 0)
1397 reg_number
= decode_reg_name (name
);
1398 if (reg_number
>= 0 || reg_number
== -3)
1399 error ("register name given for non-register variable %q+D", decl
);
1404 /* Specifying a section attribute on a variable forces it into a
1405 non-.bss section, and thus it cannot be common. */
1406 /* FIXME: In general this code should not be necessary because
1407 visibility pass is doing the same work. But notice_global_symbol
1408 is called early and it needs to make DECL_RTL to get the name.
1409 we take care of recomputing the DECL_RTL after visibility is changed. */
1410 if (TREE_CODE (decl
) == VAR_DECL
1411 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
))
1412 && DECL_SECTION_NAME (decl
) != NULL
1413 && DECL_INITIAL (decl
) == NULL_TREE
1414 && DECL_COMMON (decl
))
1415 DECL_COMMON (decl
) = 0;
1417 /* Variables can't be both common and weak. */
1418 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1419 DECL_COMMON (decl
) = 0;
1421 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1422 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1425 enum machine_mode address_mode
= Pmode
;
1426 if (TREE_TYPE (decl
) != error_mark_node
)
1428 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1429 address_mode
= targetm
.addr_space
.address_mode (as
);
1431 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1433 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1434 SET_SYMBOL_REF_DECL (x
, decl
);
1436 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1437 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1438 set_mem_attributes (x
, decl
, 1);
1439 SET_DECL_RTL (decl
, x
);
1441 /* Optionally set flags or add text to the name to record information
1442 such as that it is a function name.
1443 If the name is changed, the macro ASM_OUTPUT_LABELREF
1444 will have to know how to strip this information. */
1445 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1448 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1449 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1453 make_decl_rtl_for_debug (tree decl
)
1455 unsigned int save_aliasing_flag
;
1458 if (DECL_RTL_SET_P (decl
))
1459 return DECL_RTL (decl
);
1461 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1462 call new_alias_set. If running with -fcompare-debug, sometimes
1463 we do not want to create alias sets that will throw the alias
1464 numbers off in the comparison dumps. So... clearing
1465 flag_strict_aliasing will keep new_alias_set() from creating a
1467 save_aliasing_flag
= flag_strict_aliasing
;
1468 flag_strict_aliasing
= 0;
1470 rtl
= DECL_RTL (decl
);
1471 /* Reset DECL_RTL back, as various parts of the compiler expects
1472 DECL_RTL set meaning it is actually going to be output. */
1473 SET_DECL_RTL (decl
, NULL
);
1475 flag_strict_aliasing
= save_aliasing_flag
;
1479 /* Output a string of literal assembler code
1480 for an `asm' keyword used between functions. */
1483 assemble_asm (tree string
)
1488 if (TREE_CODE (string
) == ADDR_EXPR
)
1489 string
= TREE_OPERAND (string
, 0);
1491 p
= TREE_STRING_POINTER (string
);
1492 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1495 /* Write the address of the entity given by SYMBOL to SEC. */
1497 assemble_addr_to_section (rtx symbol
, section
*sec
)
1499 switch_to_section (sec
);
1500 assemble_align (POINTER_SIZE
);
1501 assemble_integer (symbol
, POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
1504 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1505 not) section for PRIORITY. */
1507 get_cdtor_priority_section (int priority
, bool constructor_p
)
1511 /* ??? This only works reliably with the GNU linker. */
1512 sprintf (buf
, "%s.%.5u",
1513 constructor_p
? ".ctors" : ".dtors",
1514 /* Invert the numbering so the linker puts us in the proper
1515 order; constructors are run from right to left, and the
1516 linker sorts in increasing order. */
1517 MAX_INIT_PRIORITY
- priority
);
1518 return get_section (buf
, SECTION_WRITE
, NULL
);
1522 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1526 if (priority
!= DEFAULT_INIT_PRIORITY
)
1527 sec
= get_cdtor_priority_section (priority
,
1528 /*constructor_p=*/false);
1530 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1532 assemble_addr_to_section (symbol
, sec
);
1535 #ifdef DTORS_SECTION_ASM_OP
1537 default_dtor_section_asm_out_destructor (rtx symbol
,
1538 int priority ATTRIBUTE_UNUSED
)
1540 assemble_addr_to_section (symbol
, dtors_section
);
1545 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1549 if (priority
!= DEFAULT_INIT_PRIORITY
)
1550 sec
= get_cdtor_priority_section (priority
,
1551 /*constructor_p=*/true);
1553 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1555 assemble_addr_to_section (symbol
, sec
);
1558 #ifdef CTORS_SECTION_ASM_OP
1560 default_ctor_section_asm_out_constructor (rtx symbol
,
1561 int priority ATTRIBUTE_UNUSED
)
1563 assemble_addr_to_section (symbol
, ctors_section
);
1567 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1568 a nonzero value if the constant pool should be output before the
1569 start of the function, or a zero value if the pool should output
1570 after the end of the function. The default is to put it before the
1573 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1574 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1577 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1578 to be output to assembler.
1579 Set first_global_object_name and weak_global_object_name as appropriate. */
1582 notice_global_symbol (tree decl
)
1584 const char **type
= &first_global_object_name
;
1586 if (first_global_object_name
1587 || !TREE_PUBLIC (decl
)
1588 || DECL_EXTERNAL (decl
)
1589 || !DECL_NAME (decl
)
1590 || (TREE_CODE (decl
) != FUNCTION_DECL
1591 && (TREE_CODE (decl
) != VAR_DECL
1592 || (DECL_COMMON (decl
)
1593 && (DECL_INITIAL (decl
) == 0
1594 || DECL_INITIAL (decl
) == error_mark_node
))))
1595 || !MEM_P (DECL_RTL (decl
)))
1598 /* We win when global object is found, but it is useful to know about weak
1599 symbol as well so we can produce nicer unique names. */
1600 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1601 type
= &weak_global_object_name
;
1607 rtx decl_rtl
= DECL_RTL (decl
);
1609 p
= targetm
.strip_name_encoding (XSTR (XEXP (decl_rtl
, 0), 0));
1610 name
= ggc_strdup (p
);
1616 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1617 current function goes into the cold section, so that targets can use
1618 current_function_section during RTL expansion. DECL describes the
1622 decide_function_section (tree decl
)
1624 first_function_block_is_cold
= false;
1626 if (flag_reorder_blocks_and_partition
)
1627 /* We will decide in assemble_start_function. */
1630 if (DECL_SECTION_NAME (decl
))
1632 struct cgraph_node
*node
= cgraph_node::get (current_function_decl
);
1633 /* Calls to function_section rely on first_function_block_is_cold
1635 first_function_block_is_cold
= (node
1637 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1640 in_cold_section_p
= first_function_block_is_cold
;
1643 /* Output assembler code for the constant pool of a function and associated
1644 with defining the name of the function. DECL describes the function.
1645 NAME is the function's name. For the constant pool, we use the current
1646 constant pool data. */
1649 assemble_start_function (tree decl
, const char *fnname
)
1652 char tmp_label
[100];
1653 bool hot_label_written
= false;
1655 if (flag_reorder_blocks_and_partition
)
1657 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1658 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1659 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1660 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1661 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1662 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1663 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1664 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1669 crtl
->subsections
.hot_section_label
= NULL
;
1670 crtl
->subsections
.cold_section_label
= NULL
;
1671 crtl
->subsections
.hot_section_end_label
= NULL
;
1672 crtl
->subsections
.cold_section_end_label
= NULL
;
1675 /* The following code does not need preprocessing in the assembler. */
1679 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1680 output_constant_pool (fnname
, decl
);
1682 /* Make sure the not and cold text (code) sections are properly
1683 aligned. This is necessary here in the case where the function
1684 has both hot and cold sections, because we don't want to re-set
1685 the alignment when the section switch happens mid-function. */
1687 if (flag_reorder_blocks_and_partition
)
1689 first_function_block_is_cold
= false;
1691 switch_to_section (unlikely_text_section ());
1692 assemble_align (DECL_ALIGN (decl
));
1693 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1695 /* When the function starts with a cold section, we need to explicitly
1696 align the hot section and write out the hot section label.
1697 But if the current function is a thunk, we do not have a CFG. */
1699 && BB_PARTITION (ENTRY_BLOCK_PTR_FOR_FN (cfun
)->next_bb
) == BB_COLD_PARTITION
)
1701 switch_to_section (text_section
);
1702 assemble_align (DECL_ALIGN (decl
));
1703 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1704 hot_label_written
= true;
1705 first_function_block_is_cold
= true;
1707 in_cold_section_p
= first_function_block_is_cold
;
1711 /* Switch to the correct text section for the start of the function. */
1713 switch_to_section (function_section (decl
));
1714 if (flag_reorder_blocks_and_partition
1715 && !hot_label_written
)
1716 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1718 /* Tell assembler to move to target machine's alignment for functions. */
1719 align
= floor_log2 (DECL_ALIGN (decl
) / BITS_PER_UNIT
);
1722 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1725 /* Handle a user-specified function alignment.
1726 Note that we still need to align to DECL_ALIGN, as above,
1727 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1728 if (! DECL_USER_ALIGN (decl
)
1729 && align_functions_log
> align
1730 && optimize_function_for_speed_p (cfun
))
1732 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1733 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1734 align_functions_log
, align_functions
- 1);
1736 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1740 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1741 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1744 if (!DECL_IGNORED_P (decl
))
1745 (*debug_hooks
->begin_function
) (decl
);
1747 /* Make function name accessible from other files, if appropriate. */
1749 if (TREE_PUBLIC (decl
))
1751 notice_global_symbol (decl
);
1753 globalize_decl (decl
);
1755 maybe_assemble_visibility (decl
);
1758 if (DECL_PRESERVE_P (decl
))
1759 targetm
.asm_out
.mark_decl_preserved (fnname
);
1761 /* Do any machine/system dependent processing of the function name. */
1762 #ifdef ASM_DECLARE_FUNCTION_NAME
1763 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1765 /* Standard thing is just output label for the function. */
1766 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1767 #endif /* ASM_DECLARE_FUNCTION_NAME */
1769 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1770 saw_no_split_stack
= true;
1773 /* Output assembler code associated with defining the size of the
1774 function. DECL describes the function. NAME is the function's name. */
1777 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1779 #ifdef ASM_DECLARE_FUNCTION_SIZE
1780 /* We could have switched section in the middle of the function. */
1781 if (flag_reorder_blocks_and_partition
)
1782 switch_to_section (function_section (decl
));
1783 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1785 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1787 output_constant_pool (fnname
, decl
);
1788 switch_to_section (function_section (decl
)); /* need to switch back */
1790 /* Output labels for end of hot/cold text sections (to be used by
1792 if (flag_reorder_blocks_and_partition
)
1794 section
*save_text_section
;
1796 save_text_section
= in_section
;
1797 switch_to_section (unlikely_text_section ());
1798 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1799 if (first_function_block_is_cold
)
1800 switch_to_section (text_section
);
1802 switch_to_section (function_section (decl
));
1803 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1804 switch_to_section (save_text_section
);
1808 /* Assemble code to leave SIZE bytes of zeros. */
1811 assemble_zeros (unsigned HOST_WIDE_INT size
)
1813 /* Do no output if -fsyntax-only. */
1814 if (flag_syntax_only
)
1817 #ifdef ASM_NO_SKIP_IN_TEXT
1818 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1819 so we must output 0s explicitly in the text section. */
1820 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1822 unsigned HOST_WIDE_INT i
;
1823 for (i
= 0; i
< size
; i
++)
1824 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1829 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1832 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1835 assemble_align (int align
)
1837 if (align
> BITS_PER_UNIT
)
1839 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1843 /* Assemble a string constant with the specified C string as contents. */
1846 assemble_string (const char *p
, int size
)
1851 /* If the string is very long, split it up. */
1855 int thissize
= size
- pos
;
1856 if (thissize
> maximum
)
1859 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1867 /* A noswitch_section_callback for lcomm_section. */
1870 emit_local (tree decl ATTRIBUTE_UNUSED
,
1871 const char *name ATTRIBUTE_UNUSED
,
1872 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1873 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1875 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1876 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1877 size
, DECL_ALIGN (decl
));
1879 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1880 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1883 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1888 /* A noswitch_section_callback for bss_noswitch_section. */
1890 #if defined ASM_OUTPUT_ALIGNED_BSS
1892 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1893 const char *name ATTRIBUTE_UNUSED
,
1894 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1895 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1897 #if defined ASM_OUTPUT_ALIGNED_BSS
1898 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
,
1899 get_variable_align (decl
));
1905 /* A noswitch_section_callback for comm_section. */
1908 emit_common (tree decl ATTRIBUTE_UNUSED
,
1909 const char *name ATTRIBUTE_UNUSED
,
1910 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1911 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1913 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1914 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1915 size
, get_variable_align (decl
));
1917 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1918 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
,
1919 get_variable_align (decl
));
1922 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1927 /* A noswitch_section_callback for tls_comm_section. */
1930 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1931 const char *name ATTRIBUTE_UNUSED
,
1932 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1933 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1935 #ifdef ASM_OUTPUT_TLS_COMMON
1936 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
1939 sorry ("thread-local COMMON data not implemented");
1944 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1945 NAME is the name of DECL's SYMBOL_REF. */
1948 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
,
1951 unsigned HOST_WIDE_INT size
, rounded
;
1953 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
1956 if ((flag_sanitize
& SANITIZE_ADDRESS
) && asan_protect_global (decl
))
1957 size
+= asan_red_zone_size (size
);
1959 /* Don't allocate zero bytes of common,
1960 since that means "undefined external" in the linker. */
1964 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1965 so that each uninitialized object starts on such a boundary. */
1966 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
1967 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
1968 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
1970 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
1971 && (unsigned HOST_WIDE_INT
) (align
/ BITS_PER_UNIT
) > rounded
)
1972 error ("requested alignment for %q+D is greater than "
1973 "implemented alignment of %wu", decl
, rounded
);
1976 /* A subroutine of assemble_variable. Output the label and contents of
1977 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1978 is as for assemble_variable. */
1981 assemble_variable_contents (tree decl
, const char *name
,
1982 bool dont_output_data
)
1984 /* Do any machine/system dependent processing of the object. */
1985 #ifdef ASM_DECLARE_OBJECT_NAME
1986 last_assemble_variable_decl
= decl
;
1987 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
1989 /* Standard thing is just output label for the object. */
1990 ASM_OUTPUT_LABEL (asm_out_file
, name
);
1991 #endif /* ASM_DECLARE_OBJECT_NAME */
1993 if (!dont_output_data
)
1995 /* Caller is supposed to use varpool_get_constructor when it wants
1996 to output the body. */
1997 gcc_assert (!in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
);
1998 if (DECL_INITIAL (decl
)
1999 && DECL_INITIAL (decl
) != error_mark_node
2000 && !initializer_zerop (DECL_INITIAL (decl
)))
2001 /* Output the actual data. */
2002 output_constant (DECL_INITIAL (decl
),
2003 tree_to_uhwi (DECL_SIZE_UNIT (decl
)),
2004 get_variable_align (decl
));
2006 /* Leave space for it. */
2007 assemble_zeros (tree_to_uhwi (DECL_SIZE_UNIT (decl
)));
2011 /* Assemble everything that is needed for a variable or function declaration.
2012 Not used for automatic variables, and not used for function definitions.
2013 Should not be called for variables of incomplete structure type.
2015 TOP_LEVEL is nonzero if this variable has file scope.
2016 AT_END is nonzero if this is the special handling, at end of compilation,
2017 to define things that have had only tentative definitions.
2018 DONT_OUTPUT_DATA if nonzero means don't actually output the
2019 initial value (that will be done by the caller). */
2022 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
2023 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
2026 rtx decl_rtl
, symbol
;
2029 bool asan_protected
= false;
2031 /* This function is supposed to handle VARIABLES. Ensure we have one. */
2032 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
2034 /* Emulated TLS had better not get this far. */
2035 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
2037 last_assemble_variable_decl
= 0;
2039 /* Normally no need to say anything here for external references,
2040 since assemble_external is called by the language-specific code
2041 when a declaration is first seen. */
2043 if (DECL_EXTERNAL (decl
))
2046 /* Do nothing for global register variables. */
2047 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
2049 TREE_ASM_WRITTEN (decl
) = 1;
2053 /* If type was incomplete when the variable was declared,
2054 see if it is complete now. */
2056 if (DECL_SIZE (decl
) == 0)
2057 layout_decl (decl
, 0);
2059 /* Still incomplete => don't allocate it; treat the tentative defn
2060 (which is what it must have been) as an `extern' reference. */
2062 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2064 error ("storage size of %q+D isn%'t known", decl
);
2065 TREE_ASM_WRITTEN (decl
) = 1;
2069 /* The first declaration of a variable that comes through this function
2070 decides whether it is global (in C, has external linkage)
2071 or local (in C, has internal linkage). So do nothing more
2072 if this function has already run. */
2074 if (TREE_ASM_WRITTEN (decl
))
2077 /* Make sure targetm.encode_section_info is invoked before we set
2079 decl_rtl
= DECL_RTL (decl
);
2081 TREE_ASM_WRITTEN (decl
) = 1;
2083 /* Do no output if -fsyntax-only. */
2084 if (flag_syntax_only
)
2087 if (! dont_output_data
2088 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
2090 error ("size of variable %q+D is too large", decl
);
2094 gcc_assert (MEM_P (decl_rtl
));
2095 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2096 symbol
= XEXP (decl_rtl
, 0);
2098 /* If this symbol belongs to the tree constant pool, output the constant
2099 if it hasn't already been written. */
2100 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
2102 tree decl
= SYMBOL_REF_DECL (symbol
);
2103 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
2104 output_constant_def_contents (symbol
);
2110 name
= XSTR (symbol
, 0);
2111 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2112 notice_global_symbol (decl
);
2114 /* Compute the alignment of this data. */
2116 align_variable (decl
, dont_output_data
);
2118 if ((flag_sanitize
& SANITIZE_ADDRESS
)
2119 && asan_protect_global (decl
))
2121 asan_protected
= true;
2122 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
2123 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
2126 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2128 align
= get_variable_align (decl
);
2130 if (TREE_PUBLIC (decl
))
2131 maybe_assemble_visibility (decl
);
2133 if (DECL_PRESERVE_P (decl
))
2134 targetm
.asm_out
.mark_decl_preserved (name
);
2136 /* First make the assembler name(s) global if appropriate. */
2137 sect
= get_variable_section (decl
, false);
2138 if (TREE_PUBLIC (decl
)
2139 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2140 globalize_decl (decl
);
2142 /* Output any data that we will need to use the address of. */
2143 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2144 output_addressed_constants (DECL_INITIAL (decl
));
2146 /* dbxout.c needs to know this. */
2147 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2148 DECL_IN_TEXT_SECTION (decl
) = 1;
2150 /* If the decl is part of an object_block, make sure that the decl
2151 has been positioned within its block, but do not write out its
2152 definition yet. output_object_blocks will do that later. */
2153 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2155 gcc_assert (!dont_output_data
);
2156 place_block_symbol (symbol
);
2158 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2159 assemble_noswitch_variable (decl
, name
, sect
, align
);
2162 /* The following bit of code ensures that vtable_map
2163 variables are not only in the comdat section, but that
2164 each variable has its own unique comdat name. If this
2165 code is removed, the variables end up in the same section
2166 with a single comdat name.
2168 FIXME: resolve_unique_section needs to deal better with
2169 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
2170 that is fixed, this if-else statement can be replaced with
2171 a single call to "switch_to_section (sect)". */
2172 if (sect
->named
.name
2173 && (strcmp (sect
->named
.name
, ".vtable_map_vars") == 0))
2175 #if defined (OBJECT_FORMAT_ELF)
2176 targetm
.asm_out
.named_section (sect
->named
.name
,
2177 sect
->named
.common
.flags
2182 switch_to_section (sect
);
2186 switch_to_section (sect
);
2187 if (align
> BITS_PER_UNIT
)
2188 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
2189 assemble_variable_contents (decl
, name
, dont_output_data
);
2192 unsigned HOST_WIDE_INT
int size
2193 = tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2194 assemble_zeros (asan_red_zone_size (size
));
2200 /* Given a function declaration (FN_DECL), this function assembles the
2201 function into the .preinit_array section. */
2204 assemble_vtv_preinit_initializer (tree fn_decl
)
2207 unsigned flags
= SECTION_WRITE
;
2208 rtx symbol
= XEXP (DECL_RTL (fn_decl
), 0);
2210 flags
|= SECTION_NOTYPE
;
2211 sect
= get_section (".preinit_array", flags
, fn_decl
);
2212 switch_to_section (sect
);
2213 assemble_addr_to_section (symbol
, sect
);
2216 /* Return 1 if type TYPE contains any pointers. */
2219 contains_pointers_p (tree type
)
2221 switch (TREE_CODE (type
))
2224 case REFERENCE_TYPE
:
2225 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2226 so I'll play safe and return 1. */
2232 case QUAL_UNION_TYPE
:
2235 /* For a type that has fields, see if the fields have pointers. */
2236 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2237 if (TREE_CODE (fields
) == FIELD_DECL
2238 && contains_pointers_p (TREE_TYPE (fields
)))
2244 /* An array type contains pointers if its element type does. */
2245 return contains_pointers_p (TREE_TYPE (type
));
2252 /* We delay assemble_external processing until
2253 the compilation unit is finalized. This is the best we can do for
2254 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2255 it all the way to final. See PR 17982 for further discussion. */
2256 static GTY(()) tree pending_assemble_externals
;
2258 #ifdef ASM_OUTPUT_EXTERNAL
2259 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2260 As a result, assemble_external can be called after the list of externals
2261 is processed and the pointer set destroyed. */
2262 static bool pending_assemble_externals_processed
;
2264 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2265 TREE_LIST in assemble_external. */
2266 static hash_set
<tree
> *pending_assemble_externals_set
;
2268 /* True if DECL is a function decl for which no out-of-line copy exists.
2269 It is assumed that DECL's assembler name has been set. */
2272 incorporeal_function_p (tree decl
)
2274 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2278 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2279 && (DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
2280 || DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA_WITH_ALIGN
))
2283 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2284 /* Atomic or sync builtins which have survived this far will be
2285 resolved externally and therefore are not incorporeal. */
2286 if (strncmp (name
, "__builtin_", 10) == 0)
2292 /* Actually do the tests to determine if this is necessary, and invoke
2293 ASM_OUTPUT_EXTERNAL. */
2295 assemble_external_real (tree decl
)
2297 rtx rtl
= DECL_RTL (decl
);
2299 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2300 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2301 && !incorporeal_function_p (decl
))
2303 /* Some systems do require some output. */
2304 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2305 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2311 process_pending_assemble_externals (void)
2313 #ifdef ASM_OUTPUT_EXTERNAL
2315 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2316 assemble_external_real (TREE_VALUE (list
));
2318 pending_assemble_externals
= 0;
2319 pending_assemble_externals_processed
= true;
2320 delete pending_assemble_externals_set
;
2324 /* This TREE_LIST contains any weak symbol declarations waiting
2326 static GTY(()) tree weak_decls
;
2328 /* Output something to declare an external symbol to the assembler,
2329 and qualifiers such as weakness. (Most assemblers don't need
2330 extern declaration, so we normally output nothing.) Do nothing if
2331 DECL is not external. */
2334 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2336 /* Make sure that the ASM_OUT_FILE is open.
2337 If it's not, we should not be calling this function. */
2338 gcc_assert (asm_out_file
);
2340 /* In a perfect world, the following condition would be true.
2341 Sadly, the Java and Go front ends emit assembly *from the front end*,
2342 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2344 /* This function should only be called if we are expanding, or have
2346 Ideally, only final.c would be calling this function, but it is
2347 not clear whether that would break things somehow. See PR 17982
2348 for further discussion. */
2349 gcc_assert (state
== EXPANSION
2350 || state
== FINISHED
);
2353 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2356 /* We want to output annotation for weak and external symbols at
2357 very last to check if they are references or not. */
2359 if (TARGET_SUPPORTS_WEAK
2361 /* TREE_STATIC is a weird and abused creature which is not
2362 generally the right test for whether an entity has been
2363 locally emitted, inlined or otherwise not-really-extern, but
2364 for declarations that can be weak, it happens to be
2366 && !TREE_STATIC (decl
)
2367 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2368 && value_member (decl
, weak_decls
) == NULL_TREE
)
2369 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2371 #ifdef ASM_OUTPUT_EXTERNAL
2372 if (pending_assemble_externals_processed
)
2374 assemble_external_real (decl
);
2378 if (! pending_assemble_externals_set
->add (decl
))
2379 pending_assemble_externals
= tree_cons (NULL
, decl
,
2380 pending_assemble_externals
);
2384 /* Similar, for calling a library function FUN. */
2387 assemble_external_libcall (rtx fun
)
2389 /* Declare library function name external when first used, if nec. */
2390 if (! SYMBOL_REF_USED (fun
))
2392 SYMBOL_REF_USED (fun
) = 1;
2393 targetm
.asm_out
.external_libcall (fun
);
2397 /* Assemble a label named NAME. */
2400 assemble_label (FILE *file
, const char *name
)
2402 ASM_OUTPUT_LABEL (file
, name
);
2405 /* Set the symbol_referenced flag for ID. */
2407 mark_referenced (tree id
)
2409 TREE_SYMBOL_REFERENCED (id
) = 1;
2412 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2414 mark_decl_referenced (tree decl
)
2416 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2418 /* Extern inline functions don't become needed when referenced.
2419 If we know a method will be emitted in other TU and no new
2420 functions can be marked reachable, just use the external
2422 struct cgraph_node
*node
= cgraph_node::get_create (decl
);
2423 if (!DECL_EXTERNAL (decl
)
2424 && !node
->definition
)
2425 node
->mark_force_output ();
2427 else if (TREE_CODE (decl
) == VAR_DECL
)
2429 varpool_node
*node
= varpool_node::get_create (decl
);
2430 /* C++ frontend use mark_decl_references to force COMDAT variables
2431 to be output that might appear dead otherwise. */
2432 node
->force_output
= true;
2434 /* else do nothing - we can get various sorts of CST nodes here,
2435 which do not need to be marked. */
2439 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2440 until we find an identifier that is not itself a transparent alias.
2441 Modify the alias passed to it by reference (and all aliases on the
2442 way to the ultimate target), such that they do not have to be
2443 followed again, and return the ultimate target of the alias
2447 ultimate_transparent_alias_target (tree
*alias
)
2449 tree target
= *alias
;
2451 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
2453 gcc_assert (TREE_CHAIN (target
));
2454 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
2455 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
2456 && ! TREE_CHAIN (target
));
2463 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2464 starts with a *, the rest of NAME is output verbatim. Otherwise
2465 NAME is transformed in a target-specific way (usually by the
2466 addition of an underscore). */
2469 assemble_name_raw (FILE *file
, const char *name
)
2472 fputs (&name
[1], file
);
2474 ASM_OUTPUT_LABELREF (file
, name
);
2477 /* Like assemble_name_raw, but should be used when NAME might refer to
2478 an entity that is also represented as a tree (like a function or
2479 variable). If NAME does refer to such an entity, that entity will
2480 be marked as referenced. */
2483 assemble_name (FILE *file
, const char *name
)
2485 const char *real_name
;
2488 real_name
= targetm
.strip_name_encoding (name
);
2490 id
= maybe_get_identifier (real_name
);
2495 mark_referenced (id
);
2496 ultimate_transparent_alias_target (&id
);
2498 name
= IDENTIFIER_POINTER (id
);
2499 gcc_assert (! TREE_CHAIN (id
));
2502 assemble_name_raw (file
, name
);
2505 /* Allocate SIZE bytes writable static space with a gensym name
2506 and return an RTX to refer to its address. */
2509 assemble_static_space (unsigned HOST_WIDE_INT size
)
2512 const char *namestring
;
2515 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2517 namestring
= ggc_strdup (name
);
2519 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2520 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2522 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2523 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2526 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2527 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2530 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2531 so that each uninitialized object starts on such a boundary. */
2532 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2533 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2534 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2535 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2536 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2537 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2544 /* Assemble the static constant template for function entry trampolines.
2545 This is done at most once per compilation.
2546 Returns an RTX for the address of the template. */
2548 static GTY(()) rtx initial_trampoline
;
2551 assemble_trampoline_template (void)
2558 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2560 if (initial_trampoline
)
2561 return initial_trampoline
;
2563 /* By default, put trampoline templates in read-only data section. */
2565 #ifdef TRAMPOLINE_SECTION
2566 switch_to_section (TRAMPOLINE_SECTION
);
2568 switch_to_section (readonly_data_section
);
2571 /* Write the assembler code to define one. */
2572 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2574 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2576 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2577 targetm
.asm_out
.trampoline_template (asm_out_file
);
2579 /* Record the rtl to refer to it. */
2580 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2581 name
= ggc_strdup (label
);
2582 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2583 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2585 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2586 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2587 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2589 return initial_trampoline
;
2592 /* A and B are either alignments or offsets. Return the minimum alignment
2593 that may be assumed after adding the two together. */
2595 static inline unsigned
2596 min_align (unsigned int a
, unsigned int b
)
2598 return (a
| b
) & -(a
| b
);
2601 /* Return the assembler directive for creating a given kind of integer
2602 object. SIZE is the number of bytes in the object and ALIGNED_P
2603 indicates whether it is known to be aligned. Return NULL if the
2604 assembly dialect has no such directive.
2606 The returned string should be printed at the start of a new line and
2607 be followed immediately by the object's initial value. */
2610 integer_asm_op (int size
, int aligned_p
)
2612 struct asm_int_op
*ops
;
2615 ops
= &targetm
.asm_out
.aligned_op
;
2617 ops
= &targetm
.asm_out
.unaligned_op
;
2622 return targetm
.asm_out
.byte_op
;
2636 /* Use directive OP to assemble an integer object X. Print OP at the
2637 start of the line, followed immediately by the value of X. */
2640 assemble_integer_with_op (const char *op
, rtx x
)
2642 fputs (op
, asm_out_file
);
2643 output_addr_const (asm_out_file
, x
);
2644 fputc ('\n', asm_out_file
);
2647 /* The default implementation of the asm_out.integer target hook. */
2650 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2651 unsigned int size ATTRIBUTE_UNUSED
,
2652 int aligned_p ATTRIBUTE_UNUSED
)
2654 const char *op
= integer_asm_op (size
, aligned_p
);
2655 /* Avoid GAS bugs for large values. Specifically negative values whose
2656 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2657 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE_UNITS
)
2659 return op
&& (assemble_integer_with_op (op
, x
), true);
2662 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2663 the alignment of the integer in bits. Return 1 if we were able to output
2664 the constant, otherwise 0. We must be able to output the constant,
2665 if FORCE is nonzero. */
2668 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2672 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2674 /* See if the target hook can handle this kind of object. */
2675 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2678 /* If the object is a multi-byte one, try splitting it up. Split
2679 it into words it if is multi-word, otherwise split it into bytes. */
2682 enum machine_mode omode
, imode
;
2683 unsigned int subalign
;
2684 unsigned int subsize
, i
;
2685 enum mode_class mclass
;
2687 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2688 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2689 if (GET_CODE (x
) == CONST_FIXED
)
2690 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2694 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2695 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2697 for (i
= 0; i
< size
; i
+= subsize
)
2699 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2700 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2706 /* If we've printed some of it, but not all of it, there's no going
2711 gcc_assert (!force
);
2717 assemble_real (REAL_VALUE_TYPE d
, enum machine_mode mode
, unsigned int align
)
2719 long data
[4] = {0, 0, 0, 0};
2721 int bitsize
, nelts
, nunits
, units_per
;
2723 /* This is hairy. We have a quantity of known size. real_to_target
2724 will put it into an array of *host* longs, 32 bits per element
2725 (even if long is more than 32 bits). We need to determine the
2726 number of array elements that are occupied (nelts) and the number
2727 of *target* min-addressable units that will be occupied in the
2728 object file (nunits). We cannot assume that 32 divides the
2729 mode's bitsize (size * BITS_PER_UNIT) evenly.
2731 size * BITS_PER_UNIT is used here to make sure that padding bits
2732 (which might appear at either end of the value; real_to_target
2733 will include the padding bits in its output array) are included. */
2735 nunits
= GET_MODE_SIZE (mode
);
2736 bitsize
= nunits
* BITS_PER_UNIT
;
2737 nelts
= CEIL (bitsize
, 32);
2738 units_per
= 32 / BITS_PER_UNIT
;
2740 real_to_target (data
, &d
, mode
);
2742 /* Put out the first word with the specified alignment. */
2743 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2744 nunits
-= units_per
;
2746 /* Subsequent words need only 32-bit alignment. */
2747 align
= min_align (align
, 32);
2749 for (i
= 1; i
< nelts
; i
++)
2751 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2752 nunits
-= units_per
;
2756 /* Given an expression EXP with a constant value,
2757 reduce it to the sum of an assembler symbol and an integer.
2758 Store them both in the structure *VALUE.
2759 EXP must be reducible. */
2763 HOST_WIDE_INT offset
;
2767 decode_addr_const (tree exp
, struct addr_const
*value
)
2769 tree target
= TREE_OPERAND (exp
, 0);
2775 if (TREE_CODE (target
) == COMPONENT_REF
2776 && tree_fits_shwi_p (byte_position (TREE_OPERAND (target
, 1))))
2778 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2779 target
= TREE_OPERAND (target
, 0);
2781 else if (TREE_CODE (target
) == ARRAY_REF
2782 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2784 offset
+= (tree_to_uhwi (TYPE_SIZE_UNIT (TREE_TYPE (target
)))
2785 * tree_to_shwi (TREE_OPERAND (target
, 1)));
2786 target
= TREE_OPERAND (target
, 0);
2788 else if (TREE_CODE (target
) == MEM_REF
2789 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2791 offset
+= mem_ref_offset (target
).to_short_addr ();
2792 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2794 else if (TREE_CODE (target
) == INDIRECT_REF
2795 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2796 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2798 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2803 switch (TREE_CODE (target
))
2807 x
= DECL_RTL (target
);
2811 x
= gen_rtx_MEM (FUNCTION_MODE
,
2812 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2821 x
= output_constant_def (target
, 1);
2828 gcc_assert (MEM_P (x
));
2832 value
->offset
= offset
;
2835 static GTY(()) hash_table
<tree_descriptor_hasher
> *const_desc_htab
;
2837 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2839 /* Constant pool accessor function. */
2841 hash_table
<tree_descriptor_hasher
> *
2842 constant_pool_htab (void)
2844 return const_desc_htab
;
2847 /* Compute a hash code for a constant expression. */
2850 tree_descriptor_hasher::hash (constant_descriptor_tree
*ptr
)
2856 const_hash_1 (const tree exp
)
2861 enum tree_code code
= TREE_CODE (exp
);
2863 /* Either set P and LEN to the address and len of something to hash and
2864 exit the switch or return a value. */
2869 p
= (char *) &TREE_INT_CST_ELT (exp
, 0);
2870 len
= TREE_INT_CST_NUNITS (exp
) * sizeof (HOST_WIDE_INT
);
2874 return real_hash (TREE_REAL_CST_PTR (exp
));
2877 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2880 p
= TREE_STRING_POINTER (exp
);
2881 len
= TREE_STRING_LENGTH (exp
);
2885 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2886 + const_hash_1 (TREE_IMAGPART (exp
)));
2892 hi
= 7 + VECTOR_CST_NELTS (exp
);
2894 for (i
= 0; i
< VECTOR_CST_NELTS (exp
); ++i
)
2895 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ELT (exp
, i
));
2902 unsigned HOST_WIDE_INT idx
;
2905 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2907 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2909 hi
= hi
* 603 + const_hash_1 (value
);
2917 struct addr_const value
;
2919 decode_addr_const (exp
, &value
);
2920 switch (GET_CODE (value
.base
))
2923 /* Don't hash the address of the SYMBOL_REF;
2924 only use the offset and the symbol name. */
2926 p
= XSTR (value
.base
, 0);
2927 for (i
= 0; p
[i
] != 0; i
++)
2928 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2933 + CODE_LABEL_NUMBER (LABEL_REF_LABEL (value
.base
)) * 13);
2943 case POINTER_PLUS_EXPR
:
2945 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2946 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2949 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2952 /* A language specific constant. Just hash the code. */
2956 /* Compute hashing function. */
2958 for (i
= 0; i
< len
; i
++)
2959 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2964 /* Wrapper of compare_constant, for the htab interface. */
2966 tree_descriptor_hasher::equal (constant_descriptor_tree
*c1
,
2967 constant_descriptor_tree
*c2
)
2969 if (c1
->hash
!= c2
->hash
)
2971 return compare_constant (c1
->value
, c2
->value
);
2974 /* Compare t1 and t2, and return 1 only if they are known to result in
2975 the same bit pattern on output. */
2978 compare_constant (const tree t1
, const tree t2
)
2980 enum tree_code typecode
;
2982 if (t1
== NULL_TREE
)
2983 return t2
== NULL_TREE
;
2984 if (t2
== NULL_TREE
)
2987 if (TREE_CODE (t1
) != TREE_CODE (t2
))
2990 switch (TREE_CODE (t1
))
2993 /* Integer constants are the same only if the same width of type. */
2994 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2996 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2998 return tree_int_cst_equal (t1
, t2
);
3001 /* Real constants are the same only if the same width of type. */
3002 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3005 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
3008 /* Fixed constants are the same only if the same width of type. */
3009 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3012 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
3015 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3018 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
3019 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
3020 TREE_STRING_LENGTH (t1
)));
3023 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
3024 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
3030 if (VECTOR_CST_NELTS (t1
) != VECTOR_CST_NELTS (t2
))
3033 for (i
= 0; i
< VECTOR_CST_NELTS (t1
); ++i
)
3034 if (!compare_constant (VECTOR_CST_ELT (t1
, i
),
3035 VECTOR_CST_ELT (t2
, i
)))
3043 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
3044 unsigned HOST_WIDE_INT idx
;
3046 typecode
= TREE_CODE (TREE_TYPE (t1
));
3047 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
3050 if (typecode
== ARRAY_TYPE
)
3052 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
3053 /* For arrays, check that the sizes all match. */
3054 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
3056 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
3061 /* For record and union constructors, require exact type
3063 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
3067 v1
= CONSTRUCTOR_ELTS (t1
);
3068 v2
= CONSTRUCTOR_ELTS (t2
);
3069 if (vec_safe_length (v1
) != vec_safe_length (v2
))
3072 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
3074 constructor_elt
*c1
= &(*v1
)[idx
];
3075 constructor_elt
*c2
= &(*v2
)[idx
];
3077 /* Check that each value is the same... */
3078 if (!compare_constant (c1
->value
, c2
->value
))
3080 /* ... and that they apply to the same fields! */
3081 if (typecode
== ARRAY_TYPE
)
3083 if (!compare_constant (c1
->index
, c2
->index
))
3088 if (c1
->index
!= c2
->index
)
3099 struct addr_const value1
, value2
;
3103 decode_addr_const (t1
, &value1
);
3104 decode_addr_const (t2
, &value2
);
3106 if (value1
.offset
!= value2
.offset
)
3109 code
= GET_CODE (value1
.base
);
3110 if (code
!= GET_CODE (value2
.base
))
3116 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3120 ret
= (CODE_LABEL_NUMBER (LABEL_REF_LABEL (value1
.base
))
3121 == CODE_LABEL_NUMBER (LABEL_REF_LABEL (value2
.base
)));
3131 case POINTER_PLUS_EXPR
:
3134 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3135 && compare_constant (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3138 case VIEW_CONVERT_EXPR
:
3139 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3148 /* Return the section into which constant EXP should be placed. */
3151 get_constant_section (tree exp
, unsigned int align
)
3153 return targetm
.asm_out
.select_section (exp
,
3154 compute_reloc_for_constant (exp
),
3158 /* Return the size of constant EXP in bytes. */
3160 static HOST_WIDE_INT
3161 get_constant_size (tree exp
)
3165 size
= int_size_in_bytes (TREE_TYPE (exp
));
3166 if (TREE_CODE (exp
) == STRING_CST
)
3167 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3171 /* Subroutine of output_constant_def:
3172 No constant equal to EXP is known to have been output.
3173 Make a constant descriptor to enter EXP in the hash table.
3174 Assign the label number and construct RTL to refer to the
3175 constant's location in memory.
3176 Caller is responsible for updating the hash table. */
3178 static struct constant_descriptor_tree
*
3179 build_constant_desc (tree exp
)
3181 struct constant_descriptor_tree
*desc
;
3187 desc
= ggc_alloc
<constant_descriptor_tree
> ();
3190 /* Create a string containing the label name, in LABEL. */
3191 labelno
= const_labelno
++;
3192 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3194 /* Construct the VAR_DECL associated with the constant. */
3195 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3197 DECL_ARTIFICIAL (decl
) = 1;
3198 DECL_IGNORED_P (decl
) = 1;
3199 TREE_READONLY (decl
) = 1;
3200 TREE_STATIC (decl
) = 1;
3201 TREE_ADDRESSABLE (decl
) = 1;
3202 /* We don't set the RTL yet as this would cause varpool to assume that the
3203 variable is referenced. Moreover, it would just be dropped in LTO mode.
3204 Instead we set the flag that will be recognized in make_decl_rtl. */
3205 DECL_IN_CONSTANT_POOL (decl
) = 1;
3206 DECL_INITIAL (decl
) = desc
->value
;
3207 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3208 architectures so use DATA_ALIGNMENT as well, except for strings. */
3209 if (TREE_CODE (exp
) == STRING_CST
)
3211 #ifdef CONSTANT_ALIGNMENT
3212 DECL_ALIGN (decl
) = CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
));
3216 align_variable (decl
, 0);
3218 /* Now construct the SYMBOL_REF and the MEM. */
3219 if (use_object_blocks_p ())
3221 section
*sect
= get_constant_section (exp
, DECL_ALIGN (decl
));
3222 symbol
= create_block_symbol (ggc_strdup (label
),
3223 get_block_for_section (sect
), -1);
3226 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3227 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3228 SET_SYMBOL_REF_DECL (symbol
, decl
);
3229 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3231 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3232 set_mem_attributes (rtl
, exp
, 1);
3233 set_mem_alias_set (rtl
, 0);
3234 set_mem_alias_set (rtl
, const_alias_set
);
3236 /* We cannot share RTX'es in pool entries.
3237 Mark this piece of RTL as required for unsharing. */
3238 RTX_FLAG (rtl
, used
) = 1;
3240 /* Set flags or add text to the name to record information, such as
3241 that it is a local symbol. If the name is changed, the macro
3242 ASM_OUTPUT_LABELREF will have to know how to strip this
3243 information. This call might invalidate our local variable
3244 SYMBOL; we can't use it afterward. */
3245 targetm
.encode_section_info (exp
, rtl
, true);
3252 /* Return an rtx representing a reference to constant data in memory
3253 for the constant expression EXP.
3255 If assembler code for such a constant has already been output,
3256 return an rtx to refer to it.
3257 Otherwise, output such a constant in memory
3258 and generate an rtx for it.
3260 If DEFER is nonzero, this constant can be deferred and output only
3261 if referenced in the function after all optimizations.
3263 `const_desc_table' records which constants already have label strings. */
3266 output_constant_def (tree exp
, int defer
)
3268 struct constant_descriptor_tree
*desc
;
3269 struct constant_descriptor_tree key
;
3271 /* Look up EXP in the table of constant descriptors. If we didn't find
3272 it, create a new one. */
3274 key
.hash
= const_hash_1 (exp
);
3275 constant_descriptor_tree
**loc
3276 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3281 desc
= build_constant_desc (exp
);
3282 desc
->hash
= key
.hash
;
3286 maybe_output_constant_def_contents (desc
, defer
);
3290 /* Subroutine of output_constant_def: Decide whether or not we need to
3291 output the constant DESC now, and if so, do it. */
3293 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3296 rtx symbol
= XEXP (desc
->rtl
, 0);
3297 tree exp
= desc
->value
;
3299 if (flag_syntax_only
)
3302 if (TREE_ASM_WRITTEN (exp
))
3303 /* Already output; don't do it again. */
3306 /* We can always defer constants as long as the context allows
3310 /* Increment n_deferred_constants if it exists. It needs to be at
3311 least as large as the number of constants actually referred to
3312 by the function. If it's too small we'll stop looking too early
3313 and fail to emit constants; if it's too large we'll only look
3314 through the entire function when we could have stopped earlier. */
3316 n_deferred_constants
++;
3320 output_constant_def_contents (symbol
);
3323 /* Subroutine of output_constant_def_contents. Output the definition
3324 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3325 constant's alignment in bits. */
3328 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3332 size
= get_constant_size (exp
);
3334 /* Do any machine/system dependent processing of the constant. */
3335 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3337 /* Output the value of EXP. */
3338 output_constant (exp
, size
, align
);
3341 /* We must output the constant data referred to by SYMBOL; do so. */
3344 output_constant_def_contents (rtx symbol
)
3346 tree decl
= SYMBOL_REF_DECL (symbol
);
3347 tree exp
= DECL_INITIAL (decl
);
3349 bool asan_protected
= false;
3351 /* Make sure any other constants whose addresses appear in EXP
3352 are assigned label numbers. */
3353 output_addressed_constants (exp
);
3355 /* We are no longer deferring this constant. */
3356 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3358 if ((flag_sanitize
& SANITIZE_ADDRESS
)
3359 && TREE_CODE (exp
) == STRING_CST
3360 && asan_protect_global (exp
))
3362 asan_protected
= true;
3363 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
3364 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
3367 /* If the constant is part of an object block, make sure that the
3368 decl has been positioned within its block, but do not write out
3369 its definition yet. output_object_blocks will do that later. */
3370 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3371 place_block_symbol (symbol
);
3374 align
= DECL_ALIGN (decl
);
3375 switch_to_section (get_constant_section (exp
, align
));
3376 if (align
> BITS_PER_UNIT
)
3377 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3378 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3381 HOST_WIDE_INT size
= get_constant_size (exp
);
3382 assemble_zeros (asan_red_zone_size (size
));
3387 /* Look up EXP in the table of constant descriptors. Return the rtl
3388 if it has been emitted, else null. */
3391 lookup_constant_def (tree exp
)
3393 struct constant_descriptor_tree key
;
3396 key
.hash
= const_hash_1 (exp
);
3397 constant_descriptor_tree
*desc
3398 = const_desc_htab
->find_with_hash (&key
, key
.hash
);
3400 return (desc
? desc
->rtl
: NULL_RTX
);
3403 /* Return a tree representing a reference to constant data in memory
3404 for the constant expression EXP.
3406 This is the counterpart of output_constant_def at the Tree level. */
3409 tree_output_constant_def (tree exp
)
3411 struct constant_descriptor_tree
*desc
, key
;
3414 /* Look up EXP in the table of constant descriptors. If we didn't find
3415 it, create a new one. */
3417 key
.hash
= const_hash_1 (exp
);
3418 constant_descriptor_tree
**loc
3419 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3424 desc
= build_constant_desc (exp
);
3425 desc
->hash
= key
.hash
;
3429 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3430 varpool_node::finalize_decl (decl
);
3434 struct GTY((chain_next ("%h.next"), for_user
)) constant_descriptor_rtx
{
3435 struct constant_descriptor_rtx
*next
;
3439 HOST_WIDE_INT offset
;
3441 enum machine_mode mode
;
3447 struct const_rtx_desc_hasher
: ggc_hasher
<constant_descriptor_rtx
*>
3449 static hashval_t
hash (constant_descriptor_rtx
*);
3450 static bool equal (constant_descriptor_rtx
*, constant_descriptor_rtx
*);
3453 /* Used in the hash tables to avoid outputting the same constant
3454 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3455 are output once per function, not once per file. */
3456 /* ??? Only a few targets need per-function constant pools. Most
3457 can use one per-file pool. Should add a targetm bit to tell the
3460 struct GTY(()) rtx_constant_pool
{
3461 /* Pointers to first and last constant in pool, as ordered by offset. */
3462 struct constant_descriptor_rtx
*first
;
3463 struct constant_descriptor_rtx
*last
;
3465 /* Hash facility for making memory-constants from constant rtl-expressions.
3466 It is used on RISC machines where immediate integer arguments and
3467 constant addresses are restricted so that such constants must be stored
3469 hash_table
<const_rtx_desc_hasher
> *const_rtx_htab
;
3471 /* Current offset in constant pool (does not include any
3472 machine-specific header). */
3473 HOST_WIDE_INT offset
;
3476 /* Hash and compare functions for const_rtx_htab. */
3479 const_rtx_desc_hasher::hash (constant_descriptor_rtx
*desc
)
3485 const_rtx_desc_hasher::equal (constant_descriptor_rtx
*x
,
3486 constant_descriptor_rtx
*y
)
3488 if (x
->mode
!= y
->mode
)
3490 return rtx_equal_p (x
->constant
, y
->constant
);
3493 /* Hash one component of a constant. */
3496 const_rtx_hash_1 (const_rtx x
)
3498 unsigned HOST_WIDE_INT hwi
;
3499 enum machine_mode mode
;
3504 code
= GET_CODE (x
);
3505 mode
= GET_MODE (x
);
3506 h
= (hashval_t
) code
* 1048573 + mode
;
3515 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3516 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3518 h
^= (hashval_t
) hwi
;
3519 for (i
= 1; i
< n
; ++i
)
3522 h
^= (hashval_t
) hwi
;
3527 case CONST_WIDE_INT
:
3528 hwi
= GET_MODE_PRECISION (mode
);
3530 for (i
= 0; i
< CONST_WIDE_INT_NUNITS (x
); i
++)
3531 hwi
^= CONST_WIDE_INT_ELT (x
, i
);
3536 if (TARGET_SUPPORTS_WIDE_INT
== 0 && mode
== VOIDmode
)
3538 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3542 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3546 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3550 h
^= htab_hash_string (XSTR (x
, 0));
3554 h
= h
* 251 + CODE_LABEL_NUMBER (LABEL_REF_LABEL (x
));
3558 case UNSPEC_VOLATILE
:
3559 h
= h
* 251 + XINT (x
, 1);
3569 /* Compute a hash value for X, which should be a constant. */
3572 const_rtx_hash (rtx x
)
3575 subrtx_iterator::array_type array
;
3576 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
3577 h
= h
* 509 + const_rtx_hash_1 (*iter
);
3582 /* Create and return a new rtx constant pool. */
3584 static struct rtx_constant_pool
*
3585 create_constant_pool (void)
3587 struct rtx_constant_pool
*pool
;
3589 pool
= ggc_alloc
<rtx_constant_pool
> ();
3590 pool
->const_rtx_htab
= hash_table
<const_rtx_desc_hasher
>::create_ggc (31);
3597 /* Initialize constant pool hashing for a new function. */
3600 init_varasm_status (void)
3602 crtl
->varasm
.pool
= create_constant_pool ();
3603 crtl
->varasm
.deferred_constants
= 0;
3606 /* Given a MINUS expression, simplify it if both sides
3607 include the same symbol. */
3610 simplify_subtraction (rtx x
)
3612 rtx r
= simplify_rtx (x
);
3616 /* Given a constant rtx X, make (or find) a memory constant for its value
3617 and return a MEM rtx to refer to it in memory. */
3620 force_const_mem (enum machine_mode mode
, rtx x
)
3622 struct constant_descriptor_rtx
*desc
, tmp
;
3623 struct rtx_constant_pool
*pool
;
3628 constant_descriptor_rtx
**slot
;
3630 /* If we're not allowed to drop X into the constant pool, don't. */
3631 if (targetm
.cannot_force_const_mem (mode
, x
))
3634 /* Record that this function has used a constant pool entry. */
3635 crtl
->uses_const_pool
= 1;
3637 /* Decide which pool to use. */
3638 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3639 ? shared_constant_pool
3640 : crtl
->varasm
.pool
);
3642 /* Lookup the value in the hashtable. */
3645 hash
= const_rtx_hash (x
);
3646 slot
= pool
->const_rtx_htab
->find_slot_with_hash (&tmp
, hash
, INSERT
);
3649 /* If the constant was already present, return its memory. */
3651 return copy_rtx (desc
->mem
);
3653 /* Otherwise, create a new descriptor. */
3654 desc
= ggc_alloc
<constant_descriptor_rtx
> ();
3657 /* Align the location counter as required by EXP's data type. */
3658 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3659 #ifdef CONSTANT_ALIGNMENT
3661 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3662 if (type
!= NULL_TREE
)
3663 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3667 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3668 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3671 desc
->constant
= copy_rtx (tmp
.constant
);
3672 desc
->offset
= pool
->offset
;
3675 desc
->align
= align
;
3676 desc
->labelno
= const_labelno
;
3679 pool
->offset
+= GET_MODE_SIZE (mode
);
3681 pool
->last
->next
= desc
;
3683 pool
->first
= pool
->last
= desc
;
3686 /* Create a string containing the label name, in LABEL. */
3687 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3690 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3691 the constants pool. */
3692 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3694 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3695 symbol
= create_block_symbol (ggc_strdup (label
),
3696 get_block_for_section (sect
), -1);
3699 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3701 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3702 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3703 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3705 /* Construct the MEM. */
3706 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3707 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3708 set_mem_align (def
, align
);
3710 /* If we're dropping a label to the constant pool, make sure we
3712 if (GET_CODE (x
) == LABEL_REF
)
3713 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3715 return copy_rtx (def
);
3718 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3721 get_pool_constant (const_rtx addr
)
3723 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3726 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3727 and whether it has been output or not. */
3730 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3732 struct constant_descriptor_rtx
*desc
;
3734 desc
= SYMBOL_REF_CONSTANT (addr
);
3735 *pmarked
= (desc
->mark
!= 0);
3736 return desc
->constant
;
3739 /* Similar, return the mode. */
3742 get_pool_mode (const_rtx addr
)
3744 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3747 /* Return the size of the constant pool. */
3750 get_pool_size (void)
3752 return crtl
->varasm
.pool
->offset
;
3755 /* Worker function for output_constant_pool_1. Emit assembly for X
3756 in MODE with known alignment ALIGN. */
3759 output_constant_pool_2 (enum machine_mode mode
, rtx x
, unsigned int align
)
3761 switch (GET_MODE_CLASS (mode
))
3764 case MODE_DECIMAL_FLOAT
:
3768 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3769 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3770 assemble_real (r
, mode
, align
);
3775 case MODE_PARTIAL_INT
:
3780 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3783 case MODE_VECTOR_FLOAT
:
3784 case MODE_VECTOR_INT
:
3785 case MODE_VECTOR_FRACT
:
3786 case MODE_VECTOR_UFRACT
:
3787 case MODE_VECTOR_ACCUM
:
3788 case MODE_VECTOR_UACCUM
:
3791 enum machine_mode submode
= GET_MODE_INNER (mode
);
3792 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3794 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3795 units
= CONST_VECTOR_NUNITS (x
);
3797 for (i
= 0; i
< units
; i
++)
3799 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3800 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3810 /* Worker function for output_constant_pool. Emit constant DESC,
3811 giving it ALIGN bits of alignment. */
3814 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3821 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3822 whose CODE_LABEL has been deleted. This can occur if a jump table
3823 is eliminated by optimization. If so, write a constant of zero
3824 instead. Note that this can also happen by turning the
3825 CODE_LABEL into a NOTE. */
3826 /* ??? This seems completely and utterly wrong. Certainly it's
3827 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3828 functioning even with rtx_insn::deleted and friends. */
3831 switch (GET_CODE (tmp
))
3834 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3835 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3837 tmp
= XEXP (XEXP (tmp
, 0), 0);
3841 tmp
= LABEL_REF_LABEL (tmp
);
3842 gcc_assert (!as_a
<rtx_insn
*> (tmp
)->deleted ());
3843 gcc_assert (!NOTE_P (tmp
)
3844 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3851 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3852 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3853 align
, desc
->labelno
, done
);
3856 assemble_align (align
);
3858 /* Output the label. */
3859 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3861 /* Output the data. */
3862 output_constant_pool_2 (desc
->mode
, x
, align
);
3864 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3865 sections have proper size. */
3866 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3868 && (in_section
->common
.flags
& SECTION_MERGE
))
3869 assemble_align (align
);
3871 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3877 /* Mark all constants that are referenced by SYMBOL_REFs in X.
3878 Emit referenced deferred strings. */
3881 mark_constants_in_pattern (rtx insn
)
3883 subrtx_iterator::array_type array
;
3884 FOR_EACH_SUBRTX (iter
, array
, PATTERN (insn
), ALL
)
3886 const_rtx x
= *iter
;
3887 if (GET_CODE (x
) == SYMBOL_REF
)
3889 if (CONSTANT_POOL_ADDRESS_P (x
))
3891 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3892 if (desc
->mark
== 0)
3895 iter
.substitute (desc
->constant
);
3898 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3900 tree decl
= SYMBOL_REF_DECL (x
);
3901 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
3903 n_deferred_constants
--;
3904 output_constant_def_contents (CONST_CAST_RTX (x
));
3911 /* Look through appropriate parts of INSN, marking all entries in the
3912 constant pool which are actually being used. Entries that are only
3913 referenced by other constants are also marked as used. Emit
3914 deferred strings that are used. */
3917 mark_constants (rtx_insn
*insn
)
3922 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3923 insns, not any notes that may be attached. We don't want to mark
3924 a constant just because it happens to appear in a REG_EQUIV note. */
3925 if (rtx_sequence
*seq
= dyn_cast
<rtx_sequence
*> (PATTERN (insn
)))
3927 int i
, n
= seq
->len ();
3928 for (i
= 0; i
< n
; ++i
)
3930 rtx subinsn
= seq
->element (i
);
3931 if (INSN_P (subinsn
))
3932 mark_constants_in_pattern (subinsn
);
3936 mark_constants_in_pattern (insn
);
3939 /* Look through the instructions for this function, and mark all the
3940 entries in POOL which are actually being used. Emit deferred constants
3941 which have indeed been used. */
3944 mark_constant_pool (void)
3948 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
3951 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3952 mark_constants (insn
);
3955 /* Write all the constants in POOL. */
3958 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
3960 struct constant_descriptor_rtx
*desc
;
3962 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3965 /* If the constant is part of an object_block, make sure that
3966 the constant has been positioned within its block, but do not
3967 write out its definition yet. output_object_blocks will do
3969 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
3970 && SYMBOL_REF_BLOCK (desc
->sym
))
3971 place_block_symbol (desc
->sym
);
3974 switch_to_section (targetm
.asm_out
.select_rtx_section
3975 (desc
->mode
, desc
->constant
, desc
->align
));
3976 output_constant_pool_1 (desc
, desc
->align
);
3981 /* Mark all constants that are used in the current function, then write
3982 out the function's private constant pool. */
3985 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
3986 tree fndecl ATTRIBUTE_UNUSED
)
3988 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
3990 /* It is possible for gcc to call force_const_mem and then to later
3991 discard the instructions which refer to the constant. In such a
3992 case we do not need to output the constant. */
3993 mark_constant_pool ();
3995 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3996 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3999 output_constant_pool_contents (pool
);
4001 #ifdef ASM_OUTPUT_POOL_EPILOGUE
4002 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4006 /* Write the contents of the shared constant pool. */
4009 output_shared_constant_pool (void)
4011 output_constant_pool_contents (shared_constant_pool
);
4014 /* Determine what kind of relocations EXP may need. */
4017 compute_reloc_for_constant (tree exp
)
4019 int reloc
= 0, reloc2
;
4022 switch (TREE_CODE (exp
))
4026 /* Go inside any operations that get_inner_reference can handle and see
4027 if what's inside is a constant: no need to do anything here for
4028 addresses of variables or functions. */
4029 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4030 tem
= TREE_OPERAND (tem
, 0))
4033 if (TREE_CODE (tem
) == MEM_REF
4034 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
4036 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
4040 if (!targetm
.binds_local_p (tem
))
4047 case POINTER_PLUS_EXPR
:
4048 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4049 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4053 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4054 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4055 /* The difference of two local labels is computable at link time. */
4056 if (reloc
== 1 && reloc2
== 1)
4063 case VIEW_CONVERT_EXPR
:
4064 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4069 unsigned HOST_WIDE_INT idx
;
4070 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4072 reloc
|= compute_reloc_for_constant (tem
);
4082 /* Find all the constants whose addresses are referenced inside of EXP,
4083 and make sure assembler code with a label has been output for each one.
4084 Indicate whether an ADDR_EXPR has been encountered. */
4087 output_addressed_constants (tree exp
)
4091 switch (TREE_CODE (exp
))
4095 /* Go inside any operations that get_inner_reference can handle and see
4096 if what's inside is a constant: no need to do anything here for
4097 addresses of variables or functions. */
4098 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4099 tem
= TREE_OPERAND (tem
, 0))
4102 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4103 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4104 tem
= DECL_INITIAL (tem
);
4106 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4107 output_constant_def (tem
, 0);
4109 if (TREE_CODE (tem
) == MEM_REF
)
4110 output_addressed_constants (TREE_OPERAND (tem
, 0));
4114 case POINTER_PLUS_EXPR
:
4116 output_addressed_constants (TREE_OPERAND (exp
, 1));
4120 case VIEW_CONVERT_EXPR
:
4121 output_addressed_constants (TREE_OPERAND (exp
, 0));
4126 unsigned HOST_WIDE_INT idx
;
4127 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4129 output_addressed_constants (tem
);
4138 /* Whether a constructor CTOR is a valid static constant initializer if all
4139 its elements are. This used to be internal to initializer_constant_valid_p
4140 and has been exposed to let other functions like categorize_ctor_elements
4141 evaluate the property while walking a constructor for other purposes. */
4144 constructor_static_from_elts_p (const_tree ctor
)
4146 return (TREE_CONSTANT (ctor
)
4147 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4148 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4149 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4152 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4155 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4156 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4157 which are valid when ENDTYPE is an integer of any size; in
4158 particular, this does not accept a pointer minus a constant. This
4159 returns null_pointer_node if the VALUE is an absolute constant
4160 which can be used to initialize a static variable. Otherwise it
4164 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4168 if (!INTEGRAL_TYPE_P (endtype
))
4171 op0
= TREE_OPERAND (value
, 0);
4172 op1
= TREE_OPERAND (value
, 1);
4174 /* Like STRIP_NOPS except allow the operand mode to widen. This
4175 works around a feature of fold that simplifies (int)(p1 - p2) to
4176 ((int)p1 - (int)p2) under the theory that the narrower operation
4179 while (CONVERT_EXPR_P (op0
)
4180 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4182 tree inner
= TREE_OPERAND (op0
, 0);
4183 if (inner
== error_mark_node
4184 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4185 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4186 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4191 while (CONVERT_EXPR_P (op1
)
4192 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4194 tree inner
= TREE_OPERAND (op1
, 0);
4195 if (inner
== error_mark_node
4196 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4197 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4198 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4203 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4207 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4208 cache
? cache
+ 2 : NULL
);
4209 /* Both initializers must be known. */
4213 && (op0
== null_pointer_node
4214 || TREE_CODE (value
) == MINUS_EXPR
))
4215 return null_pointer_node
;
4217 /* Support differences between labels. */
4218 if (TREE_CODE (op0
) == LABEL_DECL
4219 && TREE_CODE (op1
) == LABEL_DECL
)
4220 return null_pointer_node
;
4222 if (TREE_CODE (op0
) == STRING_CST
4223 && TREE_CODE (op1
) == STRING_CST
4224 && operand_equal_p (op0
, op1
, 1))
4225 return null_pointer_node
;
4231 /* Helper function of initializer_constant_valid_p.
4232 Return nonzero if VALUE is a valid constant-valued expression
4233 for use in initializing a static variable; one that can be an
4234 element of a "constant" initializer.
4236 Return null_pointer_node if the value is absolute;
4237 if it is relocatable, return the variable that determines the relocation.
4238 We assume that VALUE has been folded as much as possible;
4239 therefore, we do not need to check for such things as
4240 arithmetic-combinations of integers.
4242 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4245 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4249 switch (TREE_CODE (value
))
4252 if (constructor_static_from_elts_p (value
))
4254 unsigned HOST_WIDE_INT idx
;
4256 bool absolute
= true;
4258 if (cache
&& cache
[0] == value
)
4260 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4263 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4270 cache
[1] = NULL_TREE
;
4274 if (reloc
!= null_pointer_node
)
4277 /* For a non-absolute relocation, there is no single
4278 variable that can be "the variable that determines the
4283 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4285 return absolute
? null_pointer_node
: error_mark_node
;
4288 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4296 return null_pointer_node
;
4301 tree op0
= staticp (TREE_OPERAND (value
, 0));
4304 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4305 to be a constant, this is old-skool offsetof-like nonsense. */
4306 if (TREE_CODE (op0
) == INDIRECT_REF
4307 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4308 return null_pointer_node
;
4309 /* Taking the address of a nested function involves a trampoline,
4310 unless we don't need or want one. */
4311 if (TREE_CODE (op0
) == FUNCTION_DECL
4312 && DECL_STATIC_CHAIN (op0
)
4313 && !TREE_NO_TRAMPOLINE (value
))
4315 /* "&{...}" requires a temporary to hold the constructed
4317 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4323 case NON_LVALUE_EXPR
:
4324 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4327 case VIEW_CONVERT_EXPR
:
4329 tree src
= TREE_OPERAND (value
, 0);
4330 tree src_type
= TREE_TYPE (src
);
4331 tree dest_type
= TREE_TYPE (value
);
4333 /* Allow view-conversions from aggregate to non-aggregate type only
4334 if the bit pattern is fully preserved afterwards; otherwise, the
4335 RTL expander won't be able to apply a subsequent transformation
4336 to the underlying constructor. */
4337 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4339 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4340 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4345 /* Allow all other kinds of view-conversion. */
4346 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4351 tree src
= TREE_OPERAND (value
, 0);
4352 tree src_type
= TREE_TYPE (src
);
4353 tree dest_type
= TREE_TYPE (value
);
4355 /* Allow conversions between pointer types, floating-point
4356 types, and offset types. */
4357 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4358 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4359 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4360 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4361 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4363 /* Allow length-preserving conversions between integer types. */
4364 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4365 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4366 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4368 /* Allow conversions between other integer types only if
4370 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4372 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4373 if (inner
== null_pointer_node
)
4374 return null_pointer_node
;
4378 /* Allow (int) &foo provided int is as wide as a pointer. */
4379 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4380 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4381 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4383 /* Likewise conversions from int to pointers, but also allow
4384 conversions from 0. */
4385 if ((POINTER_TYPE_P (dest_type
)
4386 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4387 && INTEGRAL_TYPE_P (src_type
))
4389 if (TREE_CODE (src
) == INTEGER_CST
4390 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4391 return null_pointer_node
;
4392 if (integer_zerop (src
))
4393 return null_pointer_node
;
4394 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4395 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4398 /* Allow conversions to struct or union types if the value
4400 if (TREE_CODE (dest_type
) == RECORD_TYPE
4401 || TREE_CODE (dest_type
) == UNION_TYPE
)
4402 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4406 case POINTER_PLUS_EXPR
:
4408 /* Any valid floating-point constants will have been folded by now;
4409 with -frounding-math we hit this with addition of two constants. */
4410 if (TREE_CODE (endtype
) == REAL_TYPE
)
4412 if (cache
&& cache
[0] == value
)
4414 if (! INTEGRAL_TYPE_P (endtype
)
4415 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4417 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4419 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4422 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4423 endtype
, ncache
+ 2);
4424 /* If either term is absolute, use the other term's relocation. */
4425 if (valid0
== null_pointer_node
)
4427 else if (valid1
== null_pointer_node
)
4429 /* Support narrowing pointer differences. */
4431 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4435 /* Support narrowing pointer differences. */
4436 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4445 if (TREE_CODE (endtype
) == REAL_TYPE
)
4447 if (cache
&& cache
[0] == value
)
4449 if (! INTEGRAL_TYPE_P (endtype
)
4450 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4452 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4454 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4457 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4458 endtype
, ncache
+ 2);
4459 /* Win if second argument is absolute. */
4460 if (valid1
== null_pointer_node
)
4462 /* Win if both arguments have the same relocation.
4463 Then the value is absolute. */
4464 else if (valid0
== valid1
&& valid0
!= 0)
4465 ret
= null_pointer_node
;
4466 /* Since GCC guarantees that string constants are unique in the
4467 generated code, a subtraction between two copies of the same
4468 constant string is absolute. */
4469 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4470 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4471 && operand_equal_p (valid0
, valid1
, 1))
4472 ret
= null_pointer_node
;
4473 /* Support narrowing differences. */
4475 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4479 /* Support narrowing differences. */
4480 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4495 /* Return nonzero if VALUE is a valid constant-valued expression
4496 for use in initializing a static variable; one that can be an
4497 element of a "constant" initializer.
4499 Return null_pointer_node if the value is absolute;
4500 if it is relocatable, return the variable that determines the relocation.
4501 We assume that VALUE has been folded as much as possible;
4502 therefore, we do not need to check for such things as
4503 arithmetic-combinations of integers. */
4505 initializer_constant_valid_p (tree value
, tree endtype
)
4507 return initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4510 /* Return true if VALUE is a valid constant-valued expression
4511 for use in initializing a static bit-field; one that can be
4512 an element of a "constant" initializer. */
4515 initializer_constant_valid_for_bitfield_p (tree value
)
4517 /* For bitfields we support integer constants or possibly nested aggregates
4519 switch (TREE_CODE (value
))
4523 unsigned HOST_WIDE_INT idx
;
4526 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4527 if (!initializer_constant_valid_for_bitfield_p (elt
))
4536 case VIEW_CONVERT_EXPR
:
4537 case NON_LVALUE_EXPR
:
4539 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4548 /* output_constructor outer state of relevance in recursive calls, typically
4549 for nested aggregate bitfields. */
4552 unsigned int bit_offset
; /* current position in ... */
4553 int byte
; /* ... the outer byte buffer. */
4556 static unsigned HOST_WIDE_INT
4557 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int,
4560 /* Output assembler code for constant EXP, with no label.
4561 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4562 Assumes output_addressed_constants has been done on EXP already.
4564 Generate at least SIZE bytes of assembler data, padding at the end
4565 with zeros if necessary. SIZE must always be specified. The returned
4566 value is the actual number of bytes of assembler data generated, which
4567 may be bigger than SIZE if the object contains a variable length field.
4569 SIZE is important for structure constructors,
4570 since trailing members may have been omitted from the constructor.
4571 It is also important for initialization of arrays from string constants
4572 since the full length of the string constant might not be wanted.
4573 It is also needed for initialization of unions, where the initializer's
4574 type is just one member, and that may not be as long as the union.
4576 There a case in which we would fail to output exactly SIZE bytes:
4577 for a structure constructor that wants to produce more than SIZE bytes.
4578 But such constructors will never be generated for any possible input.
4580 ALIGN is the alignment of the data in bits. */
4582 static unsigned HOST_WIDE_INT
4583 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4585 enum tree_code code
;
4586 unsigned HOST_WIDE_INT thissize
;
4588 if (size
== 0 || flag_syntax_only
)
4591 /* See if we're trying to initialize a pointer in a non-default mode
4592 to the address of some declaration somewhere. If the target says
4593 the mode is valid for pointers, assume the target has a way of
4595 if (TREE_CODE (exp
) == NOP_EXPR
4596 && POINTER_TYPE_P (TREE_TYPE (exp
))
4597 && targetm
.addr_space
.valid_pointer_mode
4598 (TYPE_MODE (TREE_TYPE (exp
)),
4599 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4601 tree saved_type
= TREE_TYPE (exp
);
4603 /* Peel off any intermediate conversions-to-pointer for valid
4605 while (TREE_CODE (exp
) == NOP_EXPR
4606 && POINTER_TYPE_P (TREE_TYPE (exp
))
4607 && targetm
.addr_space
.valid_pointer_mode
4608 (TYPE_MODE (TREE_TYPE (exp
)),
4609 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4610 exp
= TREE_OPERAND (exp
, 0);
4612 /* If what we're left with is the address of something, we can
4613 convert the address to the final type and output it that
4615 if (TREE_CODE (exp
) == ADDR_EXPR
)
4616 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4617 /* Likewise for constant ints. */
4618 else if (TREE_CODE (exp
) == INTEGER_CST
)
4619 exp
= wide_int_to_tree (saved_type
, exp
);
4623 /* Eliminate any conversions since we'll be outputting the underlying
4625 while (CONVERT_EXPR_P (exp
)
4626 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4627 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4629 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4630 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4632 /* Make sure eliminating the conversion is really a no-op, except with
4633 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4634 union types to allow for Ada unchecked unions. */
4635 if (type_size
> op_size
4636 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4637 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4638 /* Keep the conversion. */
4641 exp
= TREE_OPERAND (exp
, 0);
4644 code
= TREE_CODE (TREE_TYPE (exp
));
4645 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4647 /* Allow a constructor with no elements for any data type.
4648 This means to fill the space with zeros. */
4649 if (TREE_CODE (exp
) == CONSTRUCTOR
4650 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4652 assemble_zeros (size
);
4656 if (TREE_CODE (exp
) == FDESC_EXPR
)
4658 #ifdef ASM_OUTPUT_FDESC
4659 HOST_WIDE_INT part
= tree_to_shwi (TREE_OPERAND (exp
, 1));
4660 tree decl
= TREE_OPERAND (exp
, 0);
4661 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4668 /* Now output the underlying data. If we've handling the padding, return.
4669 Otherwise, break and ensure SIZE is the size written. */
4676 case REFERENCE_TYPE
:
4678 case FIXED_POINT_TYPE
:
4680 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4681 EXPAND_INITIALIZER
),
4682 MIN (size
, thissize
), align
, 0))
4683 error ("initializer for integer/fixed-point value is too complicated");
4687 if (TREE_CODE (exp
) != REAL_CST
)
4688 error ("initializer for floating value is not a floating constant");
4690 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4694 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4695 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4696 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4701 switch (TREE_CODE (exp
))
4704 return output_constructor (exp
, size
, align
, NULL
);
4707 = MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
), size
);
4708 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4712 enum machine_mode inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4713 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4714 int elt_size
= GET_MODE_SIZE (inner
);
4715 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
);
4716 thissize
= elt_size
;
4717 for (unsigned int i
= 1; i
< VECTOR_CST_NELTS (exp
); i
++)
4719 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
);
4720 thissize
+= elt_size
;
4731 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4732 return output_constructor (exp
, size
, align
, NULL
);
4741 if (size
> thissize
)
4742 assemble_zeros (size
- thissize
);
4748 /* Subroutine of output_constructor, used for computing the size of
4749 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4750 type with an unspecified upper bound. */
4752 static unsigned HOST_WIDE_INT
4753 array_size_for_constructor (tree val
)
4756 unsigned HOST_WIDE_INT cnt
;
4757 tree index
, value
, tmp
;
4760 /* This code used to attempt to handle string constants that are not
4761 arrays of single-bytes, but nothing else does, so there's no point in
4763 if (TREE_CODE (val
) == STRING_CST
)
4764 return TREE_STRING_LENGTH (val
);
4766 max_index
= NULL_TREE
;
4767 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4769 if (TREE_CODE (index
) == RANGE_EXPR
)
4770 index
= TREE_OPERAND (index
, 1);
4771 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4775 if (max_index
== NULL_TREE
)
4778 /* Compute the total number of array elements. */
4779 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4780 i
= wi::to_offset (max_index
) - wi::to_offset (tmp
) + 1;
4782 /* Multiply by the array element unit size to find number of bytes. */
4783 i
*= wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4785 gcc_assert (wi::fits_uhwi_p (i
));
4786 return i
.to_uhwi ();
4789 /* Other datastructures + helpers for output_constructor. */
4791 /* output_constructor local state to support interaction with helpers. */
4795 /* Received arguments. */
4796 tree exp
; /* Constructor expression. */
4797 tree type
; /* Type of constructor expression. */
4798 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4799 unsigned int align
; /* Known initial alignment. */
4800 tree min_index
; /* Lower bound if specified for an array. */
4802 /* Output processing state. */
4803 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4804 int byte
; /* Part of a bitfield byte yet to be output. */
4805 int last_relative_index
; /* Implicit or explicit index of the last
4806 array element output within a bitfield. */
4807 bool byte_buffer_in_use
; /* Whether BYTE is in use. */
4809 /* Current element. */
4810 tree field
; /* Current field decl in a record. */
4811 tree val
; /* Current element value. */
4812 tree index
; /* Current element index. */
4816 /* Helper for output_constructor. From the current LOCAL state, output a
4817 RANGE_EXPR element. */
4820 output_constructor_array_range (oc_local_state
*local
)
4822 unsigned HOST_WIDE_INT fieldsize
4823 = int_size_in_bytes (TREE_TYPE (local
->type
));
4825 HOST_WIDE_INT lo_index
4826 = tree_to_shwi (TREE_OPERAND (local
->index
, 0));
4827 HOST_WIDE_INT hi_index
4828 = tree_to_shwi (TREE_OPERAND (local
->index
, 1));
4829 HOST_WIDE_INT index
;
4832 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4834 for (index
= lo_index
; index
<= hi_index
; index
++)
4836 /* Output the element's initial value. */
4837 if (local
->val
== NULL_TREE
)
4838 assemble_zeros (fieldsize
);
4840 fieldsize
= output_constant (local
->val
, fieldsize
, align2
);
4842 /* Count its size. */
4843 local
->total_bytes
+= fieldsize
;
4847 /* Helper for output_constructor. From the current LOCAL state, output a
4848 field element that is not true bitfield or part of an outer one. */
4851 output_constructor_regular_field (oc_local_state
*local
)
4853 /* Field size and position. Since this structure is static, we know the
4854 positions are constant. */
4855 unsigned HOST_WIDE_INT fieldsize
;
4856 HOST_WIDE_INT fieldpos
;
4858 unsigned int align2
;
4860 if (local
->index
!= NULL_TREE
)
4862 /* Perform the index calculation in modulo arithmetic but
4863 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4864 but we are using an unsigned sizetype. */
4865 unsigned prec
= TYPE_PRECISION (sizetype
);
4866 offset_int idx
= wi::sext (wi::to_offset (local
->index
)
4867 - wi::to_offset (local
->min_index
), prec
);
4868 fieldpos
= (idx
* wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
))))
4871 else if (local
->field
!= NULL_TREE
)
4872 fieldpos
= int_byte_position (local
->field
);
4876 /* Output any buffered-up bit-fields preceding this element. */
4877 if (local
->byte_buffer_in_use
)
4879 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4880 local
->total_bytes
++;
4881 local
->byte_buffer_in_use
= false;
4884 /* Advance to offset of this element.
4885 Note no alignment needed in an array, since that is guaranteed
4886 if each element has the proper size. */
4887 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4888 && fieldpos
> local
->total_bytes
)
4890 assemble_zeros (fieldpos
- local
->total_bytes
);
4891 local
->total_bytes
= fieldpos
;
4894 /* Find the alignment of this element. */
4895 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
4897 /* Determine size this element should occupy. */
4902 /* If this is an array with an unspecified upper bound,
4903 the initializer determines the size. */
4904 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4905 but we cannot do this until the deprecated support for
4906 initializing zero-length array members is removed. */
4907 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
4908 && TYPE_DOMAIN (TREE_TYPE (local
->field
))
4909 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
))))
4911 fieldsize
= array_size_for_constructor (local
->val
);
4912 /* Given a non-empty initialization, this field had
4914 gcc_assert (!fieldsize
|| !DECL_CHAIN (local
->field
));
4917 fieldsize
= tree_to_uhwi (DECL_SIZE_UNIT (local
->field
));
4920 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
4922 /* Output the element's initial value. */
4923 if (local
->val
== NULL_TREE
)
4924 assemble_zeros (fieldsize
);
4926 fieldsize
= output_constant (local
->val
, fieldsize
, align2
);
4928 /* Count its size. */
4929 local
->total_bytes
+= fieldsize
;
4932 /* Helper for output_constructor. From the LOCAL state, output an element
4933 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
4934 from the start of a possibly ongoing outer byte buffer. */
4937 output_constructor_bitfield (oc_local_state
*local
, unsigned int bit_offset
)
4939 /* Bit size of this element. */
4940 HOST_WIDE_INT ebitsize
4942 ? tree_to_uhwi (DECL_SIZE (local
->field
))
4943 : tree_to_uhwi (TYPE_SIZE (TREE_TYPE (local
->type
))));
4945 /* Relative index of this element if this is an array component. */
4946 HOST_WIDE_INT relative_index
4949 ? (tree_to_shwi (local
->index
)
4950 - tree_to_shwi (local
->min_index
))
4951 : local
->last_relative_index
+ 1)
4954 /* Bit position of this element from the start of the containing
4956 HOST_WIDE_INT constructor_relative_ebitpos
4958 ? int_bit_position (local
->field
)
4959 : ebitsize
* relative_index
);
4961 /* Bit position of this element from the start of a possibly ongoing
4962 outer byte buffer. */
4963 HOST_WIDE_INT byte_relative_ebitpos
4964 = bit_offset
+ constructor_relative_ebitpos
;
4966 /* From the start of a possibly ongoing outer byte buffer, offsets to
4967 the first bit of this element and to the first bit past the end of
4969 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
4970 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
4972 local
->last_relative_index
= relative_index
;
4974 if (local
->val
== NULL_TREE
)
4975 local
->val
= integer_zero_node
;
4977 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
4978 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
4979 local
->val
= TREE_OPERAND (local
->val
, 0);
4981 if (TREE_CODE (local
->val
) != INTEGER_CST
4982 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
4984 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
4988 /* If this field does not start in this (or next) byte, skip some bytes. */
4989 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4991 /* Output remnant of any bit field in previous bytes. */
4992 if (local
->byte_buffer_in_use
)
4994 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4995 local
->total_bytes
++;
4996 local
->byte_buffer_in_use
= false;
4999 /* If still not at proper byte, advance to there. */
5000 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5002 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
5003 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
5004 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
5008 /* Set up the buffer if necessary. */
5009 if (!local
->byte_buffer_in_use
)
5013 local
->byte_buffer_in_use
= true;
5016 /* If this is nested constructor, recurse passing the bit offset and the
5017 pending data, then retrieve the new pending data afterwards. */
5018 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
5020 oc_outer_state temp_state
;
5021 temp_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
5022 temp_state
.byte
= local
->byte
;
5024 += output_constructor (local
->val
, 0, 0, &temp_state
);
5025 local
->byte
= temp_state
.byte
;
5029 /* Otherwise, we must split the element into pieces that fall within
5030 separate bytes, and combine each byte with previous or following
5032 while (next_offset
< end_offset
)
5036 HOST_WIDE_INT value
;
5037 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
5038 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
5040 /* Advance from byte to byte within this element when necessary. */
5041 while (next_byte
!= local
->total_bytes
)
5043 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5044 local
->total_bytes
++;
5048 /* Number of bits we can process at once (all part of the same byte). */
5049 this_time
= MIN (end_offset
- next_offset
, BITS_PER_UNIT
- next_bit
);
5050 if (BYTES_BIG_ENDIAN
)
5052 /* On big-endian machine, take the most significant bits (of the
5053 bits that are significant) first and put them into bytes from
5054 the most significant end. */
5055 shift
= end_offset
- next_offset
- this_time
;
5057 /* Don't try to take a bunch of bits that cross
5058 the word boundary in the INTEGER_CST. We can
5059 only select bits from one element. */
5060 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5061 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5063 const int end
= shift
+ this_time
- 1;
5064 shift
= end
& -HOST_BITS_PER_WIDE_INT
;
5065 this_time
= end
- shift
+ 1;
5068 /* Now get the bits from the appropriate constant word. */
5069 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5070 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5072 /* Get the result. This works only when:
5073 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5074 local
->byte
|= (((value
>> shift
)
5075 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5076 << (BITS_PER_UNIT
- this_time
- next_bit
));
5080 /* On little-endian machines, take the least significant bits of
5081 the value first and pack them starting at the least significant
5082 bits of the bytes. */
5083 shift
= next_offset
- byte_relative_ebitpos
;
5085 /* Don't try to take a bunch of bits that cross
5086 the word boundary in the INTEGER_CST. We can
5087 only select bits from one element. */
5088 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5089 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5091 = HOST_BITS_PER_WIDE_INT
- (shift
& (HOST_BITS_PER_WIDE_INT
- 1));
5093 /* Now get the bits from the appropriate constant word. */
5094 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5095 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5097 /* Get the result. This works only when:
5098 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5099 local
->byte
|= (((value
>> shift
)
5100 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5104 next_offset
+= this_time
;
5105 local
->byte_buffer_in_use
= true;
5109 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5110 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5111 caller output state of relevance in recursive invocations. */
5113 static unsigned HOST_WIDE_INT
5114 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
5115 unsigned int align
, oc_outer_state
*outer
)
5117 unsigned HOST_WIDE_INT cnt
;
5118 constructor_elt
*ce
;
5120 oc_local_state local
;
5122 /* Setup our local state to communicate with helpers. */
5124 local
.type
= TREE_TYPE (exp
);
5126 local
.align
= align
;
5127 if (TREE_CODE (local
.type
) == ARRAY_TYPE
&& TYPE_DOMAIN (local
.type
))
5128 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5130 local
.min_index
= NULL_TREE
;
5132 local
.total_bytes
= 0;
5133 local
.byte_buffer_in_use
= outer
!= NULL
;
5134 local
.byte
= outer
? outer
->byte
: 0;
5135 local
.last_relative_index
= -1;
5137 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5139 /* As CE goes through the elements of the constant, FIELD goes through the
5140 structure fields if the constant is a structure. If the constant is a
5141 union, we override this by getting the field from the TREE_LIST element.
5142 But the constant could also be an array. Then FIELD is zero.
5144 There is always a maximum of one element in the chain LINK for unions
5145 (even if the initializer in a source program incorrectly contains
5148 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5149 local
.field
= TYPE_FIELDS (local
.type
);
5151 local
.field
= NULL_TREE
;
5154 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5155 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5157 local
.val
= ce
->value
;
5158 local
.index
= NULL_TREE
;
5160 /* The element in a union constructor specifies the proper field
5162 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5163 local
.field
= ce
->index
;
5165 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5166 local
.index
= ce
->index
;
5168 if (local
.field
&& flag_verbose_asm
)
5169 fprintf (asm_out_file
, "%s %s:\n",
5171 DECL_NAME (local
.field
)
5172 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5175 /* Eliminate the marker that makes a cast not be an lvalue. */
5176 if (local
.val
!= NULL_TREE
)
5177 STRIP_NOPS (local
.val
);
5179 /* Output the current element, using the appropriate helper ... */
5181 /* For an array slice not part of an outer bitfield. */
5183 && local
.index
!= NULL_TREE
5184 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5185 output_constructor_array_range (&local
);
5187 /* For a field that is neither a true bitfield nor part of an outer one,
5188 known to be at least byte aligned and multiple-of-bytes long. */
5190 && (local
.field
== NULL_TREE
5191 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5192 output_constructor_regular_field (&local
);
5194 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5195 supported for scalar fields, so we may need to convert first. */
5198 if (TREE_CODE (local
.val
) == REAL_CST
)
5200 = fold_unary (VIEW_CONVERT_EXPR
,
5201 build_nonstandard_integer_type
5202 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5204 output_constructor_bitfield (&local
, outer
? outer
->bit_offset
: 0);
5208 /* If we are not at toplevel, save the pending data for our caller.
5209 Otherwise output the pending data and padding zeros as needed. */
5211 outer
->byte
= local
.byte
;
5214 if (local
.byte_buffer_in_use
)
5216 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5217 local
.total_bytes
++;
5220 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5222 assemble_zeros (local
.size
- local
.total_bytes
);
5223 local
.total_bytes
= local
.size
;
5227 return local
.total_bytes
;
5230 /* Mark DECL as weak. */
5233 mark_weak (tree decl
)
5235 if (DECL_WEAK (decl
))
5238 struct symtab_node
*n
= symtab_node::get (decl
);
5239 if (n
&& n
->refuse_visibility_changes
)
5240 error ("%+D declared weak after being used", decl
);
5241 DECL_WEAK (decl
) = 1;
5243 if (DECL_RTL_SET_P (decl
)
5244 && MEM_P (DECL_RTL (decl
))
5245 && XEXP (DECL_RTL (decl
), 0)
5246 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5247 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5250 /* Merge weak status between NEWDECL and OLDDECL. */
5253 merge_weak (tree newdecl
, tree olddecl
)
5255 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5257 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5260 /* We put the NEWDECL on the weak_decls list at some point
5261 and OLDDECL as well. Keep just OLDDECL on the list. */
5262 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5263 if (TREE_VALUE (*pwd
) == newdecl
)
5265 *pwd
= TREE_CHAIN (*pwd
);
5272 if (DECL_WEAK (newdecl
))
5276 /* NEWDECL is weak, but OLDDECL is not. */
5278 /* If we already output the OLDDECL, we're in trouble; we can't
5279 go back and make it weak. This should never happen in
5280 unit-at-a-time compilation. */
5281 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5283 /* If we've already generated rtl referencing OLDDECL, we may
5284 have done so in a way that will not function properly with
5285 a weak symbol. Again in unit-at-a-time this should be
5287 gcc_assert (!TREE_USED (olddecl
)
5288 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5290 if (TARGET_SUPPORTS_WEAK
)
5292 /* We put the NEWDECL on the weak_decls list at some point.
5293 Replace it with the OLDDECL. */
5294 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5295 if (TREE_VALUE (wd
) == newdecl
)
5297 TREE_VALUE (wd
) = olddecl
;
5300 /* We may not find the entry on the list. If NEWDECL is a
5301 weak alias, then we will have already called
5302 globalize_decl to remove the entry; in that case, we do
5303 not need to do anything. */
5306 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5307 mark_weak (olddecl
);
5310 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5311 weak. Just update NEWDECL to indicate that it's weak too. */
5312 mark_weak (newdecl
);
5315 /* Declare DECL to be a weak symbol. */
5318 declare_weak (tree decl
)
5320 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5321 if (! TREE_PUBLIC (decl
))
5322 error ("weak declaration of %q+D must be public", decl
);
5323 else if (!TARGET_SUPPORTS_WEAK
)
5324 warning (0, "weak declaration of %q+D not supported", decl
);
5327 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5328 DECL_ATTRIBUTES (decl
)
5329 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5333 weak_finish_1 (tree decl
)
5335 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5336 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5339 if (! TREE_USED (decl
))
5342 #ifdef ASM_WEAKEN_DECL
5343 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5345 #ifdef ASM_WEAKEN_LABEL
5346 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5348 #ifdef ASM_OUTPUT_WEAK_ALIAS
5350 static bool warn_once
= 0;
5353 warning (0, "only weak aliases are supported in this configuration");
5363 /* Fiven an assembly name, find the decl it is associated with. */
5365 find_decl (tree target
)
5367 symtab_node
*node
= symtab_node::get_for_asmname (target
);
5373 /* This TREE_LIST contains weakref targets. */
5375 static GTY(()) tree weakref_targets
;
5377 /* Emit any pending weak declarations. */
5384 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5386 tree alias_decl
= TREE_PURPOSE (t
);
5387 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5389 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5390 /* Remove alias_decl from the weak list, but leave entries for
5391 the target alone. */
5393 #ifndef ASM_OUTPUT_WEAKREF
5394 else if (! TREE_SYMBOL_REFERENCED (target
))
5396 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5397 defined, otherwise we and weak_finish_1 would use
5398 different macros. */
5399 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5400 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5402 tree decl
= find_decl (target
);
5406 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5407 TREE_CODE (alias_decl
), target
,
5408 TREE_TYPE (alias_decl
));
5410 DECL_EXTERNAL (decl
) = 1;
5411 TREE_PUBLIC (decl
) = 1;
5412 DECL_ARTIFICIAL (decl
) = 1;
5413 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5414 TREE_USED (decl
) = 1;
5417 weak_finish_1 (decl
);
5426 /* Remove the alias and the target from the pending weak list
5427 so that we do not emit any .weak directives for the former,
5428 nor multiple .weak directives for the latter. */
5429 for (p
= &weak_decls
; (t2
= *p
) ; )
5431 if (TREE_VALUE (t2
) == alias_decl
5432 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5433 *p
= TREE_CHAIN (t2
);
5435 p
= &TREE_CHAIN (t2
);
5438 /* Remove other weakrefs to the same target, to speed things up. */
5439 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5441 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5442 *p
= TREE_CHAIN (t2
);
5444 p
= &TREE_CHAIN (t2
);
5449 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5451 tree decl
= TREE_VALUE (t
);
5453 weak_finish_1 (decl
);
5457 /* Emit the assembly bits to indicate that DECL is globally visible. */
5460 globalize_decl (tree decl
)
5463 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5464 if (DECL_WEAK (decl
))
5466 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5469 #ifdef ASM_WEAKEN_DECL
5470 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5472 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5475 /* Remove this function from the pending weak list so that
5476 we do not emit multiple .weak directives for it. */
5477 for (p
= &weak_decls
; (t
= *p
) ; )
5479 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5480 *p
= TREE_CHAIN (t
);
5482 p
= &TREE_CHAIN (t
);
5485 /* Remove weakrefs to the same target from the pending weakref
5486 list, for the same reason. */
5487 for (p
= &weakref_targets
; (t
= *p
) ; )
5489 if (DECL_ASSEMBLER_NAME (decl
)
5490 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5491 *p
= TREE_CHAIN (t
);
5493 p
= &TREE_CHAIN (t
);
5500 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5503 vec
<alias_pair
, va_gc
> *alias_pairs
;
5505 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5506 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5507 tree node is DECL to have the value of the tree node TARGET. */
5510 do_assemble_alias (tree decl
, tree target
)
5512 /* Emulated TLS had better not get this var. */
5513 gcc_assert (!(!targetm
.have_tls
5514 && TREE_CODE (decl
) == VAR_DECL
5515 && DECL_THREAD_LOCAL_P (decl
)));
5517 if (TREE_ASM_WRITTEN (decl
))
5520 /* We must force creation of DECL_RTL for debug info generation, even though
5521 we don't use it here. */
5522 make_decl_rtl (decl
);
5524 TREE_ASM_WRITTEN (decl
) = 1;
5525 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5527 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5529 ultimate_transparent_alias_target (&target
);
5531 if (!TREE_SYMBOL_REFERENCED (target
))
5532 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5534 #ifdef ASM_OUTPUT_WEAKREF
5535 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5536 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5537 IDENTIFIER_POINTER (target
));
5539 if (!TARGET_SUPPORTS_WEAK
)
5541 error_at (DECL_SOURCE_LOCATION (decl
),
5542 "weakref is not supported in this configuration");
5549 #ifdef ASM_OUTPUT_DEF
5550 /* Make name accessible from other files, if appropriate. */
5552 if (TREE_PUBLIC (decl
))
5554 globalize_decl (decl
);
5555 maybe_assemble_visibility (decl
);
5557 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5559 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5560 if (targetm
.has_ifunc_p ())
5561 ASM_OUTPUT_TYPE_DIRECTIVE
5562 (asm_out_file
, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5566 error_at (DECL_SOURCE_LOCATION (decl
),
5567 "ifunc is not supported on this target");
5570 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5571 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5573 ASM_OUTPUT_DEF (asm_out_file
,
5574 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5575 IDENTIFIER_POINTER (target
));
5577 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5582 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5583 # ifdef ASM_WEAKEN_DECL
5584 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5586 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5588 /* Remove this function from the pending weak list so that
5589 we do not emit multiple .weak directives for it. */
5590 for (p
= &weak_decls
; (t
= *p
) ; )
5591 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5592 *p
= TREE_CHAIN (t
);
5594 p
= &TREE_CHAIN (t
);
5596 /* Remove weakrefs to the same target from the pending weakref
5597 list, for the same reason. */
5598 for (p
= &weakref_targets
; (t
= *p
) ; )
5600 if (DECL_ASSEMBLER_NAME (decl
)
5601 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5602 *p
= TREE_CHAIN (t
);
5604 p
= &TREE_CHAIN (t
);
5610 /* Emit an assembler directive to make the symbol for DECL an alias to
5611 the symbol for TARGET. */
5614 assemble_alias (tree decl
, tree target
)
5618 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5620 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5622 ultimate_transparent_alias_target (&target
);
5624 if (alias
== target
)
5625 error ("weakref %q+D ultimately targets itself", decl
);
5626 if (TREE_PUBLIC (decl
))
5627 error ("weakref %q+D must have static linkage", decl
);
5631 #if !defined (ASM_OUTPUT_DEF)
5632 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5633 error_at (DECL_SOURCE_LOCATION (decl
),
5634 "alias definitions not supported in this configuration");
5635 TREE_ASM_WRITTEN (decl
) = 1;
5638 if (!DECL_WEAK (decl
))
5640 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5641 error_at (DECL_SOURCE_LOCATION (decl
),
5642 "ifunc is not supported in this configuration");
5644 error_at (DECL_SOURCE_LOCATION (decl
),
5645 "only weak aliases are supported in this configuration");
5646 TREE_ASM_WRITTEN (decl
) = 1;
5652 TREE_USED (decl
) = 1;
5654 /* Allow aliases to aliases. */
5655 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5656 cgraph_node::get_create (decl
)->alias
= true;
5658 varpool_node::get_create (decl
)->alias
= true;
5660 /* If the target has already been emitted, we don't have to queue the
5661 alias. This saves a tad of memory. */
5662 if (symtab
->global_info_ready
)
5663 target_decl
= find_decl (target
);
5666 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5667 || symtab
->state
>= EXPANSION
)
5668 do_assemble_alias (decl
, target
);
5671 alias_pair p
= {decl
, target
};
5672 vec_safe_push (alias_pairs
, p
);
5676 /* Record and output a table of translations from original function
5677 to its transaction aware clone. Note that tm_pure functions are
5678 considered to be their own clone. */
5680 static GTY((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
5681 htab_t tm_clone_hash
;
5684 record_tm_clone_pair (tree o
, tree n
)
5686 struct tree_map
**slot
, *h
;
5688 if (tm_clone_hash
== NULL
)
5689 tm_clone_hash
= htab_create_ggc (32, tree_map_hash
, tree_map_eq
, 0);
5691 h
= ggc_alloc
<tree_map
> ();
5692 h
->hash
= htab_hash_pointer (o
);
5696 slot
= (struct tree_map
**)
5697 htab_find_slot_with_hash (tm_clone_hash
, h
, h
->hash
, INSERT
);
5702 get_tm_clone_pair (tree o
)
5706 struct tree_map
*h
, in
;
5709 in
.hash
= htab_hash_pointer (o
);
5710 h
= (struct tree_map
*) htab_find_with_hash (tm_clone_hash
,
5718 typedef struct tm_alias_pair
5726 /* Helper function for finish_tm_clone_pairs. Dump a hash table entry
5727 into a VEC in INFO. */
5730 dump_tm_clone_to_vec (void **slot
, void *info
)
5732 struct tree_map
*map
= (struct tree_map
*) *slot
;
5733 vec
<tm_alias_pair
> *tm_alias_pairs
= (vec
<tm_alias_pair
> *) info
;
5734 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5735 tm_alias_pairs
->safe_push (p
);
5739 /* Dump the actual pairs to the .tm_clone_table section. */
5742 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5746 bool switched
= false;
5748 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5752 struct cgraph_node
*src_n
= cgraph_node::get (src
);
5753 struct cgraph_node
*dst_n
= cgraph_node::get (dst
);
5755 /* The function ipa_tm_create_version() marks the clone as needed if
5756 the original function was needed. But we also mark the clone as
5757 needed if we ever called the clone indirectly through
5758 TM_GETTMCLONE. If neither of these are true, we didn't generate
5759 a clone, and we didn't call it indirectly... no sense keeping it
5760 in the clone table. */
5761 if (!dst_n
|| !dst_n
->definition
)
5764 /* This covers the case where we have optimized the original
5765 function away, and only access the transactional clone. */
5766 if (!src_n
|| !src_n
->definition
)
5771 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5772 assemble_align (POINTER_SIZE
);
5776 assemble_integer (XEXP (DECL_RTL (src
), 0),
5777 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
5778 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5779 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
5783 /* Provide a default for the tm_clone_table section. */
5786 default_clone_table_section (void)
5788 return get_named_section (NULL
, ".tm_clone_table", 3);
5791 /* Helper comparison function for qsorting by the DECL_UID stored in
5792 alias_pair->emitted_diags. */
5795 tm_alias_pair_cmp (const void *x
, const void *y
)
5797 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5798 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5799 if (p1
->uid
< p2
->uid
)
5801 if (p1
->uid
> p2
->uid
)
5807 finish_tm_clone_pairs (void)
5809 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5811 if (tm_clone_hash
== NULL
)
5814 /* We need a determenistic order for the .tm_clone_table, otherwise
5815 we will get bootstrap comparison failures, so dump the hash table
5816 to a vector, sort it, and dump the vector. */
5818 /* Dump the hashtable to a vector. */
5819 htab_traverse_noresize (tm_clone_hash
, dump_tm_clone_to_vec
,
5820 (void *) &tm_alias_pairs
);
5822 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5825 dump_tm_clone_pairs (tm_alias_pairs
);
5827 htab_delete (tm_clone_hash
);
5828 tm_clone_hash
= NULL
;
5829 tm_alias_pairs
.release ();
5833 /* Emit an assembler directive to set symbol for DECL visibility to
5834 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5837 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5838 int vis ATTRIBUTE_UNUSED
)
5840 #ifdef HAVE_GAS_HIDDEN
5841 static const char * const visibility_types
[] = {
5842 NULL
, "protected", "hidden", "internal"
5845 const char *name
, *type
;
5847 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5848 type
= visibility_types
[vis
];
5850 fprintf (asm_out_file
, "\t.%s\t", type
);
5851 assemble_name (asm_out_file
, name
);
5852 fprintf (asm_out_file
, "\n");
5854 if (!DECL_ARTIFICIAL (decl
))
5855 warning (OPT_Wattributes
, "visibility attribute not supported "
5856 "in this configuration; ignored");
5860 /* A helper function to call assemble_visibility when needed for a decl. */
5863 maybe_assemble_visibility (tree decl
)
5865 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5867 if (vis
!= VISIBILITY_DEFAULT
)
5869 targetm
.asm_out
.assemble_visibility (decl
, vis
);
5876 /* Returns 1 if the target configuration supports defining public symbols
5877 so that one of them will be chosen at link time instead of generating a
5878 multiply-defined symbol error, whether through the use of weak symbols or
5879 a target-specific mechanism for having duplicates discarded. */
5882 supports_one_only (void)
5884 if (SUPPORTS_ONE_ONLY
)
5886 return TARGET_SUPPORTS_WEAK
;
5889 /* Set up DECL as a public symbol that can be defined in multiple
5890 translation units without generating a linker error. */
5893 make_decl_one_only (tree decl
, tree comdat_group
)
5895 struct symtab_node
*symbol
;
5896 gcc_assert (TREE_CODE (decl
) == VAR_DECL
5897 || TREE_CODE (decl
) == FUNCTION_DECL
);
5899 TREE_PUBLIC (decl
) = 1;
5901 if (TREE_CODE (decl
) == VAR_DECL
)
5902 symbol
= varpool_node::get_create (decl
);
5904 symbol
= cgraph_node::get_create (decl
);
5906 if (SUPPORTS_ONE_ONLY
)
5908 #ifdef MAKE_DECL_ONE_ONLY
5909 MAKE_DECL_ONE_ONLY (decl
);
5911 symbol
->set_comdat_group (comdat_group
);
5913 else if (TREE_CODE (decl
) == VAR_DECL
5914 && (DECL_INITIAL (decl
) == 0
5915 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
5916 DECL_COMMON (decl
) = 1;
5919 gcc_assert (TARGET_SUPPORTS_WEAK
);
5920 DECL_WEAK (decl
) = 1;
5925 init_varasm_once (void)
5927 section_htab
= hash_table
<section_hasher
>::create_ggc (31);
5928 object_block_htab
= hash_table
<object_block_hasher
>::create_ggc (31);
5929 const_desc_htab
= hash_table
<tree_descriptor_hasher
>::create_ggc (1009);
5931 const_alias_set
= new_alias_set ();
5932 shared_constant_pool
= create_constant_pool ();
5934 #ifdef TEXT_SECTION_ASM_OP
5935 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
5936 TEXT_SECTION_ASM_OP
);
5939 #ifdef DATA_SECTION_ASM_OP
5940 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5941 DATA_SECTION_ASM_OP
);
5944 #ifdef SDATA_SECTION_ASM_OP
5945 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5946 SDATA_SECTION_ASM_OP
);
5949 #ifdef READONLY_DATA_SECTION_ASM_OP
5950 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
5951 READONLY_DATA_SECTION_ASM_OP
);
5954 #ifdef CTORS_SECTION_ASM_OP
5955 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
5956 CTORS_SECTION_ASM_OP
);
5959 #ifdef DTORS_SECTION_ASM_OP
5960 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
5961 DTORS_SECTION_ASM_OP
);
5964 #ifdef BSS_SECTION_ASM_OP
5965 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5966 output_section_asm_op
,
5967 BSS_SECTION_ASM_OP
);
5970 #ifdef SBSS_SECTION_ASM_OP
5971 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5972 output_section_asm_op
,
5973 SBSS_SECTION_ASM_OP
);
5976 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5977 | SECTION_COMMON
, emit_tls_common
);
5978 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5979 | SECTION_COMMON
, emit_local
);
5980 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5981 | SECTION_COMMON
, emit_common
);
5983 #if defined ASM_OUTPUT_ALIGNED_BSS
5984 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
5988 targetm
.asm_out
.init_sections ();
5990 if (readonly_data_section
== NULL
)
5991 readonly_data_section
= text_section
;
5993 #ifdef ASM_OUTPUT_EXTERNAL
5994 pending_assemble_externals_set
= new hash_set
<tree
>;
5999 decl_default_tls_model (const_tree decl
)
6001 enum tls_model kind
;
6004 is_local
= targetm
.binds_local_p (decl
);
6008 kind
= TLS_MODEL_LOCAL_EXEC
;
6010 kind
= TLS_MODEL_INITIAL_EXEC
;
6013 /* Local dynamic is inefficient when we're not combining the
6014 parts of the address. */
6015 else if (optimize
&& is_local
)
6016 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
6018 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
6019 if (kind
< flag_tls_default
)
6020 kind
= flag_tls_default
;
6025 /* Select a set of attributes for section NAME based on the properties
6026 of DECL and whether or not RELOC indicates that DECL's initializer
6027 might contain runtime relocations.
6029 We make the section read-only and executable for a function decl,
6030 read-only for a const data decl, and writable for a non-const data decl. */
6033 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6037 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6038 flags
= SECTION_CODE
;
6041 enum section_category category
6042 = categorize_decl_for_section (decl
, reloc
);
6043 if (decl_readonly_section_1 (category
))
6045 else if (category
== SECCAT_DATA_REL_RO
6046 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6047 flags
= SECTION_WRITE
| SECTION_RELRO
;
6049 flags
= SECTION_WRITE
;
6053 flags
= SECTION_WRITE
;
6054 if (strcmp (name
, ".data.rel.ro") == 0
6055 || strcmp (name
, ".data.rel.ro.local") == 0)
6056 flags
|= SECTION_RELRO
;
6059 if (decl
&& DECL_P (decl
) && DECL_COMDAT_GROUP (decl
))
6060 flags
|= SECTION_LINKONCE
;
6062 if (strcmp (name
, ".vtable_map_vars") == 0)
6063 flags
|= SECTION_LINKONCE
;
6065 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6066 flags
|= SECTION_TLS
| SECTION_WRITE
;
6068 if (strcmp (name
, ".bss") == 0
6069 || strncmp (name
, ".bss.", 5) == 0
6070 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6071 || strcmp (name
, ".persistent.bss") == 0
6072 || strcmp (name
, ".sbss") == 0
6073 || strncmp (name
, ".sbss.", 6) == 0
6074 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6075 flags
|= SECTION_BSS
;
6077 if (strcmp (name
, ".tdata") == 0
6078 || strncmp (name
, ".tdata.", 7) == 0
6079 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6080 flags
|= SECTION_TLS
;
6082 if (strcmp (name
, ".tbss") == 0
6083 || strncmp (name
, ".tbss.", 6) == 0
6084 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6085 flags
|= SECTION_TLS
| SECTION_BSS
;
6087 /* These three sections have special ELF types. They are neither
6088 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6089 want to print a section type (@progbits or @nobits). If someone
6090 is silly enough to emit code or TLS variables to one of these
6091 sections, then don't handle them specially. */
6092 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6093 && (strcmp (name
, ".init_array") == 0
6094 || strcmp (name
, ".fini_array") == 0
6095 || strcmp (name
, ".preinit_array") == 0))
6096 flags
|= SECTION_NOTYPE
;
6101 /* Return true if the target supports some form of global BSS,
6102 either through bss_noswitch_section, or by selecting a BSS
6103 section in TARGET_ASM_SELECT_SECTION. */
6106 have_global_bss_p (void)
6108 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6111 /* Output assembly to switch to section NAME with attribute FLAGS.
6112 Four variants for common object file formats. */
6115 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6116 unsigned int flags ATTRIBUTE_UNUSED
,
6117 tree decl ATTRIBUTE_UNUSED
)
6119 /* Some object formats don't support named sections at all. The
6120 front-end should already have flagged this as an error. */
6124 #ifndef TLS_SECTION_ASM_FLAG
6125 #define TLS_SECTION_ASM_FLAG 'T'
6129 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6130 tree decl ATTRIBUTE_UNUSED
)
6132 char flagchars
[10], *f
= flagchars
;
6134 /* If we have already declared this section, we can use an
6135 abbreviated form to switch back to it -- unless this section is
6136 part of a COMDAT groups, in which case GAS requires the full
6137 declaration every time. */
6138 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6139 && (flags
& SECTION_DECLARED
))
6141 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6145 if (!(flags
& SECTION_DEBUG
))
6147 #if defined (HAVE_GAS_SECTION_EXCLUDE) && HAVE_GAS_SECTION_EXCLUDE == 1
6148 if (flags
& SECTION_EXCLUDE
)
6151 if (flags
& SECTION_WRITE
)
6153 if (flags
& SECTION_CODE
)
6155 if (flags
& SECTION_SMALL
)
6157 if (flags
& SECTION_MERGE
)
6159 if (flags
& SECTION_STRINGS
)
6161 if (flags
& SECTION_TLS
)
6162 *f
++ = TLS_SECTION_ASM_FLAG
;
6163 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6167 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6169 if (!(flags
& SECTION_NOTYPE
))
6174 if (flags
& SECTION_BSS
)
6180 /* On platforms that use "@" as the assembly comment character,
6182 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6184 fprintf (asm_out_file
, format
, type
);
6186 if (flags
& SECTION_ENTSIZE
)
6187 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6188 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6190 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6191 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6193 fprintf (asm_out_file
, ",%s,comdat",
6194 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6198 putc ('\n', asm_out_file
);
6202 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6203 tree decl ATTRIBUTE_UNUSED
)
6205 char flagchars
[8], *f
= flagchars
;
6207 if (flags
& SECTION_WRITE
)
6209 if (flags
& SECTION_CODE
)
6213 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6217 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6220 default_coff_asm_named_section (name
, flags
, decl
);
6222 if (flags
& SECTION_LINKONCE
)
6224 /* Functions may have been compiled at various levels of
6225 optimization so we can't use `same_size' here.
6226 Instead, have the linker pick one. */
6227 fprintf (asm_out_file
, "\t.linkonce %s\n",
6228 (flags
& SECTION_CODE
? "discard" : "same_size"));
6232 /* The lame default section selector. */
6235 default_select_section (tree decl
, int reloc
,
6236 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6240 if (decl_readonly_section (decl
, reloc
))
6241 return readonly_data_section
;
6243 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6245 if (! ((flag_pic
&& reloc
)
6246 || !TREE_READONLY (decl
)
6247 || TREE_SIDE_EFFECTS (decl
)
6248 || !TREE_CONSTANT (decl
)))
6249 return readonly_data_section
;
6251 else if (TREE_CODE (decl
) == STRING_CST
)
6252 return readonly_data_section
;
6253 else if (! (flag_pic
&& reloc
))
6254 return readonly_data_section
;
6256 return data_section
;
6259 enum section_category
6260 categorize_decl_for_section (const_tree decl
, int reloc
)
6262 enum section_category ret
;
6264 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6266 else if (TREE_CODE (decl
) == STRING_CST
)
6268 if ((flag_sanitize
& SANITIZE_ADDRESS
)
6269 && asan_protect_global (CONST_CAST_TREE (decl
)))
6270 /* or !flag_merge_constants */
6271 return SECCAT_RODATA
;
6273 return SECCAT_RODATA_MERGE_STR
;
6275 else if (TREE_CODE (decl
) == VAR_DECL
)
6277 if (bss_initializer_p (decl
))
6279 else if (! TREE_READONLY (decl
)
6280 || TREE_SIDE_EFFECTS (decl
)
6281 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6283 /* Here the reloc_rw_mask is not testing whether the section should
6284 be read-only or not, but whether the dynamic link will have to
6285 do something. If so, we wish to segregate the data in order to
6286 minimize cache misses inside the dynamic linker. */
6287 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6288 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6292 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6293 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6294 else if (reloc
|| flag_merge_constants
< 2
6295 || ((flag_sanitize
& SANITIZE_ADDRESS
)
6296 && asan_protect_global (CONST_CAST_TREE (decl
))))
6297 /* C and C++ don't allow different variables to share the same
6298 location. -fmerge-all-constants allows even that (at the
6299 expense of not conforming). */
6300 ret
= SECCAT_RODATA
;
6301 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6302 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6304 ret
= SECCAT_RODATA_MERGE_CONST
;
6306 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6308 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6309 || TREE_SIDE_EFFECTS (decl
)
6310 || ! TREE_CONSTANT (decl
))
6313 ret
= SECCAT_RODATA
;
6316 ret
= SECCAT_RODATA
;
6318 /* There are no read-only thread-local sections. */
6319 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6321 /* Note that this would be *just* SECCAT_BSS, except that there's
6322 no concept of a read-only thread-local-data section. */
6323 if (ret
== SECCAT_BSS
6324 || (flag_zero_initialized_in_bss
6325 && initializer_zerop (DECL_INITIAL (decl
))))
6331 /* If the target uses small data sections, select it. */
6332 else if (targetm
.in_small_data_p (decl
))
6334 if (ret
== SECCAT_BSS
)
6336 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6337 ret
= SECCAT_SRODATA
;
6346 decl_readonly_section_1 (enum section_category category
)
6351 case SECCAT_RODATA_MERGE_STR
:
6352 case SECCAT_RODATA_MERGE_STR_INIT
:
6353 case SECCAT_RODATA_MERGE_CONST
:
6354 case SECCAT_SRODATA
:
6362 decl_readonly_section (const_tree decl
, int reloc
)
6364 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6367 /* Select a section based on the above categorization. */
6370 default_elf_select_section (tree decl
, int reloc
,
6371 unsigned HOST_WIDE_INT align
)
6374 switch (categorize_decl_for_section (decl
, reloc
))
6377 /* We're not supposed to be called on FUNCTION_DECLs. */
6380 return readonly_data_section
;
6381 case SECCAT_RODATA_MERGE_STR
:
6382 return mergeable_string_section (decl
, align
, 0);
6383 case SECCAT_RODATA_MERGE_STR_INIT
:
6384 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6385 case SECCAT_RODATA_MERGE_CONST
:
6386 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6387 case SECCAT_SRODATA
:
6391 return data_section
;
6392 case SECCAT_DATA_REL
:
6393 sname
= ".data.rel";
6395 case SECCAT_DATA_REL_LOCAL
:
6396 sname
= ".data.rel.local";
6398 case SECCAT_DATA_REL_RO
:
6399 sname
= ".data.rel.ro";
6401 case SECCAT_DATA_REL_RO_LOCAL
:
6402 sname
= ".data.rel.ro.local";
6425 return get_named_section (decl
, sname
, reloc
);
6428 /* Construct a unique section name based on the decl name and the
6429 categorization performed above. */
6432 default_unique_section (tree decl
, int reloc
)
6434 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6435 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6436 const char *prefix
, *name
, *linkonce
;
6439 switch (categorize_decl_for_section (decl
, reloc
))
6442 prefix
= one_only
? ".t" : ".text";
6445 case SECCAT_RODATA_MERGE_STR
:
6446 case SECCAT_RODATA_MERGE_STR_INIT
:
6447 case SECCAT_RODATA_MERGE_CONST
:
6448 prefix
= one_only
? ".r" : ".rodata";
6450 case SECCAT_SRODATA
:
6451 prefix
= one_only
? ".s2" : ".sdata2";
6454 prefix
= one_only
? ".d" : ".data";
6456 case SECCAT_DATA_REL
:
6457 prefix
= one_only
? ".d.rel" : ".data.rel";
6459 case SECCAT_DATA_REL_LOCAL
:
6460 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6462 case SECCAT_DATA_REL_RO
:
6463 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6465 case SECCAT_DATA_REL_RO_LOCAL
:
6466 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6469 prefix
= one_only
? ".s" : ".sdata";
6472 prefix
= one_only
? ".b" : ".bss";
6475 prefix
= one_only
? ".sb" : ".sbss";
6478 prefix
= one_only
? ".td" : ".tdata";
6481 prefix
= one_only
? ".tb" : ".tbss";
6487 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
6488 name
= targetm
.strip_name_encoding (name
);
6490 /* If we're using one_only, then there needs to be a .gnu.linkonce
6491 prefix to the section name. */
6492 linkonce
= one_only
? ".gnu.linkonce" : "";
6494 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6496 set_decl_section_name (decl
, string
);
6499 /* Subroutine of compute_reloc_for_rtx for leaf rtxes. */
6502 compute_reloc_for_rtx_1 (const_rtx x
)
6504 switch (GET_CODE (x
))
6507 return SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6515 /* Like compute_reloc_for_constant, except for an RTX. The return value
6516 is a mask for which bit 1 indicates a global relocation, and bit 0
6517 indicates a local relocation. */
6520 compute_reloc_for_rtx (const_rtx x
)
6522 switch (GET_CODE (x
))
6526 return compute_reloc_for_rtx_1 (x
);
6531 subrtx_iterator::array_type array
;
6532 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
6533 reloc
|= compute_reloc_for_rtx_1 (*iter
);
6543 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
6545 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6547 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6548 return data_section
;
6550 return readonly_data_section
;
6554 default_elf_select_rtx_section (enum machine_mode mode
, rtx x
,
6555 unsigned HOST_WIDE_INT align
)
6557 int reloc
= compute_reloc_for_rtx (x
);
6559 /* ??? Handle small data here somehow. */
6561 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6564 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6566 return get_named_section (NULL
, ".data.rel.ro", 3);
6569 return mergeable_constant_section (mode
, align
, 0);
6572 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6575 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6580 /* Careful not to prod global register variables. */
6583 symbol
= XEXP (rtl
, 0);
6584 if (GET_CODE (symbol
) != SYMBOL_REF
)
6587 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6588 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6589 flags
|= SYMBOL_FLAG_FUNCTION
;
6590 if (targetm
.binds_local_p (decl
))
6591 flags
|= SYMBOL_FLAG_LOCAL
;
6592 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6593 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6594 else if (targetm
.in_small_data_p (decl
))
6595 flags
|= SYMBOL_FLAG_SMALL
;
6596 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6597 being PUBLIC, the thing *must* be defined in this translation unit.
6598 Prevent this buglet from being propagated into rtl code as well. */
6599 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6600 flags
|= SYMBOL_FLAG_EXTERNAL
;
6602 SYMBOL_REF_FLAGS (symbol
) = flags
;
6605 /* By default, we do nothing for encode_section_info, so we need not
6606 do anything but discard the '*' marker. */
6609 default_strip_name_encoding (const char *str
)
6611 return str
+ (*str
== '*');
6614 #ifdef ASM_OUTPUT_DEF
6615 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6616 anchor relative to ".", the current section position. */
6619 default_asm_output_anchor (rtx symbol
)
6623 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6624 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6625 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6629 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6632 default_use_anchors_for_symbol_p (const_rtx symbol
)
6637 /* Don't use anchors for mergeable sections. The linker might move
6638 the objects around. */
6639 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6640 if (sect
->common
.flags
& SECTION_MERGE
)
6643 /* Don't use anchors for small data sections. The small data register
6644 acts as an anchor for such sections. */
6645 if (sect
->common
.flags
& SECTION_SMALL
)
6648 decl
= SYMBOL_REF_DECL (symbol
);
6649 if (decl
&& DECL_P (decl
))
6651 /* Don't use section anchors for decls that might be defined or
6652 usurped by other modules. */
6653 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
6656 /* Don't use section anchors for decls that will be placed in a
6657 small data section. */
6658 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6659 one above. The problem is that we only use SECTION_SMALL for
6660 sections that should be marked as small in the section directive. */
6661 if (targetm
.in_small_data_p (decl
))
6667 /* Return true when RESOLUTION indicate that symbol will be bound to the
6668 definition provided by current .o file. */
6671 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6673 return (resolution
== LDPR_PREVAILING_DEF
6674 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6675 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6678 /* Return true when RESOLUTION indicate that symbol will be bound locally
6679 within current executable or DSO. */
6682 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6684 return (resolution
== LDPR_PREVAILING_DEF
6685 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6686 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6687 || resolution
== LDPR_PREEMPTED_REG
6688 || resolution
== LDPR_PREEMPTED_IR
6689 || resolution
== LDPR_RESOLVED_IR
6690 || resolution
== LDPR_RESOLVED_EXEC
);
6693 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6694 wrt cross-module name binding. */
6697 default_binds_local_p (const_tree exp
)
6699 return default_binds_local_p_1 (exp
, flag_shlib
);
6703 default_binds_local_p_1 (const_tree exp
, int shlib
)
6706 bool resolved_locally
= false;
6707 bool resolved_to_local_def
= false;
6709 /* With resolution file in hands, take look into resolutions.
6710 We can't just return true for resolved_locally symbols,
6711 because dynamic linking might overwrite symbols
6712 in shared libraries. */
6713 if (TREE_CODE (exp
) == VAR_DECL
&& TREE_PUBLIC (exp
)
6714 && (TREE_STATIC (exp
) || DECL_EXTERNAL (exp
)))
6716 varpool_node
*vnode
= varpool_node::get (exp
);
6717 if (vnode
&& (resolution_local_p (vnode
->resolution
) || vnode
->in_other_partition
))
6718 resolved_locally
= true;
6720 && resolution_to_local_definition_p (vnode
->resolution
))
6721 resolved_to_local_def
= true;
6723 else if (TREE_CODE (exp
) == FUNCTION_DECL
&& TREE_PUBLIC (exp
))
6725 struct cgraph_node
*node
= cgraph_node::get (exp
);
6727 && (resolution_local_p (node
->resolution
) || node
->in_other_partition
))
6728 resolved_locally
= true;
6730 && resolution_to_local_definition_p (node
->resolution
))
6731 resolved_to_local_def
= true;
6734 /* A non-decl is an entry in the constant pool. */
6737 /* Weakrefs may not bind locally, even though the weakref itself is always
6738 static and therefore local. Similarly, the resolver for ifunc functions
6739 might resolve to a non-local function.
6740 FIXME: We can resolve the weakref case more curefuly by looking at the
6742 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6743 || (TREE_CODE (exp
) == FUNCTION_DECL
6744 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6746 /* Static variables are always local. */
6747 else if (! TREE_PUBLIC (exp
))
6749 /* A variable is local if the user has said explicitly that it will
6751 else if ((DECL_VISIBILITY_SPECIFIED (exp
)
6752 || resolved_to_local_def
)
6753 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6755 /* Variables defined outside this object might not be local. */
6756 else if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6758 /* If defined in this object and visibility is not default, must be
6760 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6762 /* Default visibility weak data can be overridden by a strong symbol
6763 in another module and so are not local. */
6764 else if (DECL_WEAK (exp
)
6765 && !resolved_locally
)
6767 /* If PIC, then assume that any global name can be overridden by
6768 symbols resolved from other modules. */
6771 /* Uninitialized COMMON variable may be unified with symbols
6772 resolved from other modules. */
6773 else if (DECL_COMMON (exp
)
6774 && !resolved_locally
6775 && (DECL_INITIAL (exp
) == NULL
6776 || (!in_lto_p
&& DECL_INITIAL (exp
) == error_mark_node
)))
6778 /* Otherwise we're left with initialized (or non-common) global data
6779 which is of necessity defined locally. */
6786 /* Return true when references to DECL must bind to current definition in
6789 The condition is usually equivalent to whether the function binds to the
6790 current module (shared library or executable), that is to binds_local_p.
6791 We use this fact to avoid need for another target hook and implement
6792 the logic using binds_local_p and just special cases where
6793 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6794 the weak definitions (that can be overwritten at linktime by other
6795 definition from different object file) and when resolution info is available
6796 we simply use the knowledge passed to us by linker plugin. */
6798 decl_binds_to_current_def_p (const_tree decl
)
6800 gcc_assert (DECL_P (decl
));
6801 if (!targetm
.binds_local_p (decl
))
6803 if (!TREE_PUBLIC (decl
))
6805 /* When resolution is available, just use it. */
6806 if (TREE_CODE (decl
) == VAR_DECL
6807 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)))
6809 varpool_node
*vnode
= varpool_node::get (decl
);
6811 && vnode
->resolution
!= LDPR_UNKNOWN
)
6812 return resolution_to_local_definition_p (vnode
->resolution
);
6814 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
6816 struct cgraph_node
*node
= cgraph_node::get (decl
);
6818 && node
->resolution
!= LDPR_UNKNOWN
)
6819 return resolution_to_local_definition_p (node
->resolution
);
6821 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6822 binds locally but still can be overwritten), DECL_COMMON (can be merged
6823 with a non-common definition somewhere in the same module) or
6825 This rely on fact that binds_local_p behave as decl_replaceable_p
6826 for all other declaration types. */
6827 if (DECL_WEAK (decl
))
6829 if (DECL_COMMON (decl
)
6830 && (DECL_INITIAL (decl
) == NULL
6831 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6833 if (DECL_EXTERNAL (decl
))
6838 /* A replaceable function or variable is one which may be replaced
6839 at link-time with an entirely different definition, provided that the
6840 replacement has the same type. For example, functions declared
6841 with __attribute__((weak)) on most systems are replaceable.
6843 COMDAT functions are not replaceable, since all definitions of the
6844 function must be equivalent. It is important that COMDAT functions
6845 not be treated as replaceable so that use of C++ template
6846 instantiations is not penalized. */
6849 decl_replaceable_p (tree decl
)
6851 gcc_assert (DECL_P (decl
));
6852 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
6854 if (!flag_semantic_interposition
6855 && !DECL_WEAK (decl
))
6857 return !decl_binds_to_current_def_p (decl
);
6860 /* Default function to output code that will globalize a label. A
6861 target must define GLOBAL_ASM_OP or provide its own function to
6862 globalize a label. */
6863 #ifdef GLOBAL_ASM_OP
6865 default_globalize_label (FILE * stream
, const char *name
)
6867 fputs (GLOBAL_ASM_OP
, stream
);
6868 assemble_name (stream
, name
);
6869 putc ('\n', stream
);
6871 #endif /* GLOBAL_ASM_OP */
6873 /* Default function to output code that will globalize a declaration. */
6875 default_globalize_decl_name (FILE * stream
, tree decl
)
6877 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6878 targetm
.asm_out
.globalize_label (stream
, name
);
6881 /* Default function to output a label for unwind information. The
6882 default is to do nothing. A target that needs nonlocal labels for
6883 unwind information must provide its own function to do this. */
6885 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6886 tree decl ATTRIBUTE_UNUSED
,
6887 int for_eh ATTRIBUTE_UNUSED
,
6888 int empty ATTRIBUTE_UNUSED
)
6892 /* Default function to output a label to divide up the exception table.
6893 The default is to do nothing. A target that needs/wants to divide
6894 up the table must provide it's own function to do this. */
6896 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
6900 /* This is how to output an internal numbered label where PREFIX is
6901 the class of label and LABELNO is the number within the class. */
6904 default_generate_internal_label (char *buf
, const char *prefix
,
6905 unsigned long labelno
)
6907 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6910 /* This is how to output an internal numbered label where PREFIX is
6911 the class of label and LABELNO is the number within the class. */
6914 default_internal_label (FILE *stream
, const char *prefix
,
6915 unsigned long labelno
)
6917 char *const buf
= (char *) alloca (40 + strlen (prefix
));
6918 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6919 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
6923 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
6926 default_asm_declare_constant_name (FILE *file
, const char *name
,
6927 const_tree exp ATTRIBUTE_UNUSED
,
6928 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
6930 assemble_label (file
, name
);
6933 /* This is the default behavior at the beginning of a file. It's
6934 controlled by two other target-hook toggles. */
6936 default_file_start (void)
6938 if (targetm
.asm_file_start_app_off
6939 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
6940 fputs (ASM_APP_OFF
, asm_out_file
);
6942 if (targetm
.asm_file_start_file_directive
)
6943 output_file_directive (asm_out_file
, main_input_filename
);
6946 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6947 which emits a special section directive used to indicate whether or
6948 not this object file needs an executable stack. This is primarily
6949 a GNU extension to ELF but could be used on other targets. */
6951 int trampolines_created
;
6954 file_end_indicate_exec_stack (void)
6956 unsigned int flags
= SECTION_DEBUG
;
6957 if (trampolines_created
)
6958 flags
|= SECTION_CODE
;
6960 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
6963 /* Emit a special section directive to indicate that this object file
6964 was compiled with -fsplit-stack. This is used to let the linker
6965 detect calls between split-stack code and non-split-stack code, so
6966 that it can modify the split-stack code to allocate a sufficiently
6967 large stack. We emit another special section if there are any
6968 functions in this file which have the no_split_stack attribute, to
6969 prevent the linker from warning about being unable to convert the
6970 functions if they call non-split-stack code. */
6973 file_end_indicate_split_stack (void)
6975 if (flag_split_stack
)
6977 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
6979 if (saw_no_split_stack
)
6980 switch_to_section (get_section (".note.GNU-no-split-stack",
6981 SECTION_DEBUG
, NULL
));
6985 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6986 a get_unnamed_section callback. */
6989 output_section_asm_op (const void *directive
)
6991 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
6994 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6995 the current section is NEW_SECTION. */
6998 switch_to_section (section
*new_section
)
7000 if (in_section
== new_section
)
7003 if (new_section
->common
.flags
& SECTION_FORGET
)
7006 in_section
= new_section
;
7008 switch (SECTION_STYLE (new_section
))
7011 targetm
.asm_out
.named_section (new_section
->named
.name
,
7012 new_section
->named
.common
.flags
,
7013 new_section
->named
.decl
);
7016 case SECTION_UNNAMED
:
7017 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
7020 case SECTION_NOSWITCH
:
7025 new_section
->common
.flags
|= SECTION_DECLARED
;
7028 /* If block symbol SYMBOL has not yet been assigned an offset, place
7029 it at the end of its block. */
7032 place_block_symbol (rtx symbol
)
7034 unsigned HOST_WIDE_INT size
, mask
, offset
;
7035 struct constant_descriptor_rtx
*desc
;
7036 unsigned int alignment
;
7037 struct object_block
*block
;
7040 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7041 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7044 /* Work out the symbol's size and alignment. */
7045 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7047 desc
= SYMBOL_REF_CONSTANT (symbol
);
7048 alignment
= desc
->align
;
7049 size
= GET_MODE_SIZE (desc
->mode
);
7051 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7053 decl
= SYMBOL_REF_DECL (symbol
);
7054 alignment
= DECL_ALIGN (decl
);
7055 size
= get_constant_size (DECL_INITIAL (decl
));
7056 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7057 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7058 && asan_protect_global (DECL_INITIAL (decl
)))
7059 size
+= asan_red_zone_size (size
);
7063 struct symtab_node
*snode
;
7064 decl
= SYMBOL_REF_DECL (symbol
);
7066 snode
= symtab_node::get (decl
);
7069 rtx target
= DECL_RTL (snode
->ultimate_alias_target ()->decl
);
7071 place_block_symbol (target
);
7072 SYMBOL_REF_BLOCK_OFFSET (symbol
) = SYMBOL_REF_BLOCK_OFFSET (target
);
7075 alignment
= get_variable_align (decl
);
7076 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7077 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7078 && asan_protect_global (decl
))
7080 size
+= asan_red_zone_size (size
);
7081 alignment
= MAX (alignment
,
7082 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7086 /* Calculate the object's offset from the start of the block. */
7087 block
= SYMBOL_REF_BLOCK (symbol
);
7088 mask
= alignment
/ BITS_PER_UNIT
- 1;
7089 offset
= (block
->size
+ mask
) & ~mask
;
7090 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7092 /* Record the block's new alignment and size. */
7093 block
->alignment
= MAX (block
->alignment
, alignment
);
7094 block
->size
= offset
+ size
;
7096 vec_safe_push (block
->objects
, symbol
);
7099 /* Return the anchor that should be used to address byte offset OFFSET
7100 from the first object in BLOCK. MODEL is the TLS model used
7104 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7105 enum tls_model model
)
7108 unsigned int begin
, middle
, end
;
7109 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7112 /* Work out the anchor's offset. Use an offset of 0 for the first
7113 anchor so that we don't pessimize the case where we take the address
7114 of a variable at the beginning of the block. This is particularly
7115 useful when a block has only one variable assigned to it.
7117 We try to place anchors RANGE bytes apart, so there can then be
7118 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7119 a ptr_mode offset. With some target settings, the lowest such
7120 anchor might be out of range for the lowest ptr_mode offset;
7121 likewise the highest anchor for the highest offset. Use anchors
7122 at the extreme ends of the ptr_mode range in such cases.
7124 All arithmetic uses unsigned integers in order to avoid
7126 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7127 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7128 range
= max_offset
- min_offset
+ 1;
7133 bias
= 1 << (GET_MODE_BITSIZE (ptr_mode
) - 1);
7136 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7137 delta
-= delta
% range
;
7140 offset
= (HOST_WIDE_INT
) (-delta
);
7144 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7145 delta
-= delta
% range
;
7146 if (delta
> bias
- 1)
7148 offset
= (HOST_WIDE_INT
) delta
;
7152 /* Do a binary search to see if there's already an anchor we can use.
7153 Set BEGIN to the new anchor's index if not. */
7155 end
= vec_safe_length (block
->anchors
);
7156 while (begin
!= end
)
7158 middle
= (end
+ begin
) / 2;
7159 anchor
= (*block
->anchors
)[middle
];
7160 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7162 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7164 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7166 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7172 /* Create a new anchor with a unique label. */
7173 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7174 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7175 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7176 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7178 /* Insert it at index BEGIN. */
7179 vec_safe_insert (block
->anchors
, begin
, anchor
);
7183 /* Output the objects in BLOCK. */
7186 output_object_block (struct object_block
*block
)
7188 struct constant_descriptor_rtx
*desc
;
7190 HOST_WIDE_INT offset
;
7194 if (!block
->objects
)
7197 /* Switch to the section and make sure that the first byte is
7198 suitably aligned. */
7199 switch_to_section (block
->sect
);
7200 assemble_align (block
->alignment
);
7202 /* Define the values of all anchors relative to the current section
7204 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7205 targetm
.asm_out
.output_anchor (symbol
);
7207 /* Output the objects themselves. */
7209 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7211 /* Move to the object's offset, padding with zeros if necessary. */
7212 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7213 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7214 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7216 desc
= SYMBOL_REF_CONSTANT (symbol
);
7217 output_constant_pool_1 (desc
, 1);
7218 offset
+= GET_MODE_SIZE (desc
->mode
);
7220 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7223 decl
= SYMBOL_REF_DECL (symbol
);
7224 assemble_constant_contents (DECL_INITIAL (decl
), XSTR (symbol
, 0),
7226 size
= get_constant_size (DECL_INITIAL (decl
));
7228 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7229 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7230 && asan_protect_global (DECL_INITIAL (decl
)))
7232 size
= asan_red_zone_size (size
);
7233 assemble_zeros (size
);
7240 decl
= SYMBOL_REF_DECL (symbol
);
7241 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7242 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7244 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7245 && asan_protect_global (decl
))
7247 size
= asan_red_zone_size (size
);
7248 assemble_zeros (size
);
7255 /* A htab_traverse callback used to call output_object_block for
7256 each member of object_block_htab. */
7259 output_object_block_htab (object_block
**slot
, void *)
7261 output_object_block (*slot
);
7265 /* Output the definitions of all object_blocks. */
7268 output_object_blocks (void)
7270 object_block_htab
->traverse
<void *, output_object_block_htab
> (NULL
);
7273 /* This function provides a possible implementation of the
7274 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7275 by -frecord-gcc-switches it creates a new mergeable, string section in the
7276 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7277 contains the switches in ASCII format.
7279 FIXME: This code does not correctly handle double quote characters
7280 that appear inside strings, (it strips them rather than preserving them).
7281 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7282 characters - instead it treats them as sub-string separators. Since
7283 we want to emit NUL strings terminators into the object file we have to use
7287 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7291 case SWITCH_TYPE_PASSED
:
7292 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7293 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7296 case SWITCH_TYPE_DESCRIPTIVE
:
7299 /* Distinguish between invocations where name is NULL. */
7300 static bool started
= false;
7306 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7310 | (SECTION_ENTSIZE
& 1),
7312 switch_to_section (sec
);
7321 /* The return value is currently ignored by the caller, but must be 0.
7322 For -fverbose-asm the return value would be the number of characters
7323 emitted into the assembler file. */
7327 /* Emit text to declare externally defined symbols. It is needed to
7328 properly support non-default visibility. */
7330 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7332 const char *name ATTRIBUTE_UNUSED
)
7334 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7335 set in order to avoid putting out names that are never really
7337 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7338 && targetm
.binds_local_p (decl
))
7339 maybe_assemble_visibility (decl
);
7342 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7345 default_asm_output_source_filename (FILE *file
, const char *name
)
7347 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7348 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7350 fprintf (file
, "\t.file\t");
7351 output_quoted_string (file
, name
);
7356 /* Output a file name in the form wanted by System V. */
7359 output_file_directive (FILE *asm_file
, const char *input_name
)
7364 if (input_name
== NULL
)
7365 input_name
= "<stdin>";
7367 input_name
= remap_debug_filename (input_name
);
7369 len
= strlen (input_name
);
7370 na
= input_name
+ len
;
7372 /* NA gets INPUT_NAME sans directory names. */
7373 while (na
> input_name
)
7375 if (IS_DIR_SEPARATOR (na
[-1]))
7380 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7383 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7386 make_debug_expr_from_rtl (const_rtx exp
)
7388 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7389 enum machine_mode mode
= GET_MODE (exp
);
7392 DECL_ARTIFICIAL (ddecl
) = 1;
7393 if (REG_P (exp
) && REG_EXPR (exp
))
7394 type
= TREE_TYPE (REG_EXPR (exp
));
7395 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7396 type
= TREE_TYPE (MEM_EXPR (exp
));
7399 if (type
&& TYPE_MODE (type
) == mode
)
7400 TREE_TYPE (ddecl
) = type
;
7402 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7403 DECL_MODE (ddecl
) = mode
;
7404 dval
= gen_rtx_DEBUG_EXPR (mode
);
7405 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7406 SET_DECL_RTL (ddecl
, dval
);
7410 #ifdef ELF_ASCII_ESCAPES
7411 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7414 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7419 fputs (STRING_ASM_OP
, f
);
7424 escape
= ELF_ASCII_ESCAPES
[c
];
7431 /* TODO: Print in hex with fast function, important for -flto. */
7432 fprintf (f
, "\\%03o", c
);
7445 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7448 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7450 const char *limit
= s
+ len
;
7451 const char *last_null
= NULL
;
7452 unsigned bytes_in_chunk
= 0;
7456 for (; s
< limit
; s
++)
7460 if (bytes_in_chunk
>= 60)
7469 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7476 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7478 if (bytes_in_chunk
> 0)
7485 default_elf_asm_output_limited_string (f
, s
);
7490 if (bytes_in_chunk
== 0)
7491 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7494 escape
= ELF_ASCII_ESCAPES
[c
];
7502 /* TODO: Print in hex with fast function, important for -flto. */
7503 fprintf (f
, "\\%03o", c
);
7504 bytes_in_chunk
+= 4;
7509 bytes_in_chunk
+= 2;
7516 if (bytes_in_chunk
> 0)
7524 static GTY(()) section
*elf_init_array_section
;
7525 static GTY(()) section
*elf_fini_array_section
;
7528 get_elf_initfini_array_priority_section (int priority
,
7532 if (priority
!= DEFAULT_INIT_PRIORITY
)
7535 sprintf (buf
, "%s.%.5u",
7536 constructor_p
? ".init_array" : ".fini_array",
7538 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7544 if (elf_init_array_section
== NULL
)
7545 elf_init_array_section
7546 = get_section (".init_array",
7547 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7548 sec
= elf_init_array_section
;
7552 if (elf_fini_array_section
== NULL
)
7553 elf_fini_array_section
7554 = get_section (".fini_array",
7555 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7556 sec
= elf_fini_array_section
;
7562 /* Use .init_array section for constructors. */
7565 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7567 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7569 assemble_addr_to_section (symbol
, sec
);
7572 /* Use .fini_array section for destructors. */
7575 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7577 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7579 assemble_addr_to_section (symbol
, sec
);
7582 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7584 This is a bit of a cheat. The real default is a no-op, but this
7585 hook is the default for all targets with a .ident directive. */
7588 default_asm_output_ident_directive (const char *ident_str
)
7590 const char *ident_asm_op
= "\t.ident\t";
7592 /* If we are still in the front end, do not write out the string
7593 to asm_out_file. Instead, add a fake top-level asm statement.
7594 This allows the front ends to use this hook without actually
7595 writing to asm_out_file, to handle #ident or Pragma Ident. */
7596 if (symtab
->state
== PARSING
)
7598 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7599 symtab
->finalize_toplevel_asm (build_string (strlen (buf
), buf
));
7602 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7605 #include "gt-varasm.h"