1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987-2014 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
21 /* This file handles generation of all the assembler code
22 *except* the instructions of a function.
23 This includes declarations of variables and their initial values.
25 We also output the assembler code for constants stored in memory
26 and are responsible for combining constants with the same value. */
30 #include "coretypes.h"
34 #include "stor-layout.h"
35 #include "stringpool.h"
40 #include "hard-reg-set.h"
43 #include "diagnostic-core.h"
46 #include "langhooks.h"
50 #include "common/common-target.h"
51 #include "targhooks.h"
55 #include "basic-block.h"
57 #ifdef XCOFF_DEBUGGING_INFO
58 #include "xcoffout.h" /* Needed for external data
59 declarations for e.g. AIX 4.x. */
62 /* The (assembler) name of the first globally-visible object output. */
63 extern GTY(()) const char *first_global_object_name
;
64 extern GTY(()) const char *weak_global_object_name
;
66 const char *first_global_object_name
;
67 const char *weak_global_object_name
;
70 struct constant_descriptor_rtx
;
71 struct rtx_constant_pool
;
73 #define n_deferred_constants (crtl->varasm.deferred_constants)
75 /* Number for making the label on the next
76 constant that is stored in memory. */
78 static GTY(()) int const_labelno
;
80 /* Carry information from ASM_DECLARE_OBJECT_NAME
81 to ASM_FINISH_DECLARE_OBJECT. */
83 int size_directive_output
;
85 /* The last decl for which assemble_variable was called,
86 if it did ASM_DECLARE_OBJECT_NAME.
87 If the last call to assemble_variable didn't do that,
90 tree last_assemble_variable_decl
;
92 /* The following global variable indicates if the first basic block
93 in a function belongs to the cold partition or not. */
95 bool first_function_block_is_cold
;
97 /* We give all constants their own alias set. Perhaps redundant with
98 MEM_READONLY_P, but pre-dates it. */
100 static alias_set_type const_alias_set
;
102 /* Whether we saw any functions with no_split_stack. */
104 static bool saw_no_split_stack
;
106 static const char *strip_reg_name (const char *);
107 static int contains_pointers_p (tree
);
108 #ifdef ASM_OUTPUT_EXTERNAL
109 static bool incorporeal_function_p (tree
);
111 static void decode_addr_const (tree
, struct addr_const
*);
112 static hashval_t
const_desc_hash (const void *);
113 static int const_desc_eq (const void *, const void *);
114 static hashval_t
const_hash_1 (const tree
);
115 static int compare_constant (const tree
, const tree
);
116 static void output_constant_def_contents (rtx
);
117 static void output_addressed_constants (tree
);
118 static unsigned HOST_WIDE_INT
output_constant (tree
, unsigned HOST_WIDE_INT
,
120 static void globalize_decl (tree
);
121 static bool decl_readonly_section_1 (enum section_category
);
122 #ifdef BSS_SECTION_ASM_OP
123 #ifdef ASM_OUTPUT_ALIGNED_BSS
124 static void asm_output_aligned_bss (FILE *, tree
, const char *,
125 unsigned HOST_WIDE_INT
, int)
128 #endif /* BSS_SECTION_ASM_OP */
129 static void mark_weak (tree
);
130 static void output_constant_pool (const char *, tree
);
132 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
133 section
*text_section
;
134 section
*data_section
;
135 section
*readonly_data_section
;
136 section
*sdata_section
;
137 section
*ctors_section
;
138 section
*dtors_section
;
139 section
*bss_section
;
140 section
*sbss_section
;
142 /* Various forms of common section. All are guaranteed to be nonnull. */
143 section
*tls_comm_section
;
144 section
*comm_section
;
145 section
*lcomm_section
;
147 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
149 section
*bss_noswitch_section
;
151 /* The section that holds the main exception table, when known. The section
152 is set either by the target's init_sections hook or by the first call to
153 switch_to_exception_section. */
154 section
*exception_section
;
156 /* The section that holds the DWARF2 frame unwind information, when known.
157 The section is set either by the target's init_sections hook or by the
158 first call to switch_to_eh_frame_section. */
159 section
*eh_frame_section
;
161 /* asm_out_file's current section. This is NULL if no section has yet
162 been selected or if we lose track of what the current section is. */
165 /* True if code for the current function is currently being directed
166 at the cold section. */
167 bool in_cold_section_p
;
169 /* A linked list of all the unnamed sections. */
170 static GTY(()) section
*unnamed_sections
;
172 /* Return a nonzero value if DECL has a section attribute. */
173 #define IN_NAMED_SECTION(DECL) \
174 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
175 && DECL_SECTION_NAME (DECL) != NULL)
177 /* Hash table of named sections. */
178 static GTY((param_is (section
))) htab_t section_htab
;
180 /* A table of object_blocks, indexed by section. */
181 static GTY((param_is (struct object_block
))) htab_t object_block_htab
;
183 /* The next number to use for internal anchor labels. */
184 static GTY(()) int anchor_labelno
;
186 /* A pool of constants that can be shared between functions. */
187 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
189 /* Helper routines for maintaining section_htab. */
192 section_entry_eq (const void *p1
, const void *p2
)
194 const section
*old
= (const section
*) p1
;
195 const char *new_name
= (const char *) p2
;
197 return strcmp (old
->named
.name
, new_name
) == 0;
201 section_entry_hash (const void *p
)
203 const section
*old
= (const section
*) p
;
204 return htab_hash_string (old
->named
.name
);
207 /* Return a hash value for section SECT. */
210 hash_section (section
*sect
)
212 if (sect
->common
.flags
& SECTION_NAMED
)
213 return htab_hash_string (sect
->named
.name
);
214 return sect
->common
.flags
;
217 /* Helper routines for maintaining object_block_htab. */
220 object_block_entry_eq (const void *p1
, const void *p2
)
222 const struct object_block
*old
= (const struct object_block
*) p1
;
223 const section
*new_section
= (const section
*) p2
;
225 return old
->sect
== new_section
;
229 object_block_entry_hash (const void *p
)
231 const struct object_block
*old
= (const struct object_block
*) p
;
232 return hash_section (old
->sect
);
235 /* Return a new unnamed section with the given fields. */
238 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
243 sect
= ggc_alloc
<section
> ();
244 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
245 sect
->unnamed
.callback
= callback
;
246 sect
->unnamed
.data
= data
;
247 sect
->unnamed
.next
= unnamed_sections
;
249 unnamed_sections
= sect
;
253 /* Return a SECTION_NOSWITCH section with the given fields. */
256 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
260 sect
= ggc_alloc
<section
> ();
261 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
262 sect
->noswitch
.callback
= callback
;
267 /* Return the named section structure associated with NAME. Create
268 a new section with the given fields if no such structure exists. */
271 get_section (const char *name
, unsigned int flags
, tree decl
)
273 section
*sect
, **slot
;
276 htab_find_slot_with_hash (section_htab
, name
,
277 htab_hash_string (name
), INSERT
);
278 flags
|= SECTION_NAMED
;
281 sect
= ggc_alloc
<section
> ();
282 sect
->named
.common
.flags
= flags
;
283 sect
->named
.name
= ggc_strdup (name
);
284 sect
->named
.decl
= decl
;
290 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
291 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
293 /* It is fine if one of the section flags is
294 SECTION_WRITE | SECTION_RELRO and the other has none of these
295 flags (i.e. read-only) in named sections and either the
296 section hasn't been declared yet or has been declared as writable.
297 In that case just make sure the resulting flags are
298 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
300 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
301 == (SECTION_WRITE
| SECTION_RELRO
)
302 && (sect
->common
.flags
303 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
304 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
305 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
306 || (sect
->common
.flags
& SECTION_WRITE
)))
308 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
311 /* Sanity check user variables for flag changes. */
312 if (sect
->named
.decl
!= NULL
313 && DECL_P (sect
->named
.decl
)
314 && decl
!= sect
->named
.decl
)
316 if (decl
!= NULL
&& DECL_P (decl
))
317 error ("%+D causes a section type conflict with %D",
318 decl
, sect
->named
.decl
);
320 error ("section type conflict with %D", sect
->named
.decl
);
321 inform (DECL_SOURCE_LOCATION (sect
->named
.decl
),
322 "%qD was declared here", sect
->named
.decl
);
324 else if (decl
!= NULL
&& DECL_P (decl
))
325 error ("%+D causes a section type conflict", decl
);
327 error ("section type conflict");
328 /* Make sure we don't error about one section multiple times. */
329 sect
->common
.flags
|= SECTION_OVERRIDE
;
335 /* Return true if the current compilation mode benefits from having
336 objects grouped into blocks. */
339 use_object_blocks_p (void)
341 return flag_section_anchors
;
344 /* Return the object_block structure for section SECT. Create a new
345 structure if we haven't created one already. Return null if SECT
348 static struct object_block
*
349 get_block_for_section (section
*sect
)
351 struct object_block
*block
;
357 slot
= htab_find_slot_with_hash (object_block_htab
, sect
,
358 hash_section (sect
), INSERT
);
359 block
= (struct object_block
*) *slot
;
362 block
= ggc_cleared_alloc
<object_block
> ();
369 /* Create a symbol with label LABEL and place it at byte offset
370 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
371 is not yet known. LABEL must be a garbage-collected string. */
374 create_block_symbol (const char *label
, struct object_block
*block
,
375 HOST_WIDE_INT offset
)
380 /* Create the extended SYMBOL_REF. */
381 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
382 symbol
= (rtx
) ggc_internal_alloc (size
);
384 /* Initialize the normal SYMBOL_REF fields. */
385 memset (symbol
, 0, size
);
386 PUT_CODE (symbol
, SYMBOL_REF
);
387 PUT_MODE (symbol
, Pmode
);
388 XSTR (symbol
, 0) = label
;
389 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
391 /* Initialize the block_symbol stuff. */
392 SYMBOL_REF_BLOCK (symbol
) = block
;
393 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
398 /* Return a section with a particular name and with whatever SECTION_*
399 flags section_type_flags deems appropriate. The name of the section
400 is taken from NAME if nonnull, otherwise it is taken from DECL's
401 DECL_SECTION_NAME. DECL is the decl associated with the section
402 (see the section comment for details) and RELOC is as for
403 section_type_flags. */
406 get_named_section (tree decl
, const char *name
, int reloc
)
412 gcc_assert (decl
&& DECL_P (decl
) && DECL_SECTION_NAME (decl
));
413 name
= DECL_SECTION_NAME (decl
);
416 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
417 return get_section (name
, flags
, decl
);
420 /* Worker for resolve_unique_section. */
423 set_implicit_section (struct symtab_node
*n
, void *data ATTRIBUTE_UNUSED
)
425 n
->implicit_section
= true;
429 /* If required, set DECL_SECTION_NAME to a unique name. */
432 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
433 int flag_function_or_data_sections
)
435 if (DECL_SECTION_NAME (decl
) == NULL
436 && targetm_common
.have_named_sections
437 && (flag_function_or_data_sections
438 || DECL_COMDAT_GROUP (decl
)))
440 targetm
.asm_out
.unique_section (decl
, reloc
);
441 if (DECL_SECTION_NAME (decl
))
442 symtab_node::get (decl
)->call_for_symbol_and_aliases
443 (set_implicit_section
, NULL
, true);
447 #ifdef BSS_SECTION_ASM_OP
449 #ifdef ASM_OUTPUT_ALIGNED_BSS
451 /* Utility function for targets to use in implementing
452 ASM_OUTPUT_ALIGNED_BSS.
453 ??? It is believed that this function will work in most cases so such
454 support is localized here. */
457 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
458 const char *name
, unsigned HOST_WIDE_INT size
,
461 switch_to_section (bss_section
);
462 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
463 #ifdef ASM_DECLARE_OBJECT_NAME
464 last_assemble_variable_decl
= decl
;
465 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
467 /* Standard thing is just output label for the object. */
468 ASM_OUTPUT_LABEL (file
, name
);
469 #endif /* ASM_DECLARE_OBJECT_NAME */
470 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
475 #endif /* BSS_SECTION_ASM_OP */
477 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
478 /* Return the hot section for function DECL. Return text_section for
482 hot_function_section (tree decl
)
484 if (decl
!= NULL_TREE
485 && DECL_SECTION_NAME (decl
) != NULL
486 && targetm_common
.have_named_sections
)
487 return get_named_section (decl
, NULL
, 0);
493 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
496 When DECL_SECTION_NAME is non-NULL and it is implicit section and
497 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
498 concatenate the name with NAMED_SECTION_SUFFIX.
499 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
502 get_named_text_section (tree decl
,
503 const char *text_section_name
,
504 const char *named_section_suffix
)
506 if (decl
&& DECL_SECTION_NAME (decl
))
508 if (named_section_suffix
)
510 const char *dsn
= DECL_SECTION_NAME (decl
);
511 const char *stripped_name
;
514 name
= (char *) alloca (strlen (dsn
) + 1);
518 stripped_name
= targetm
.strip_name_encoding (name
);
520 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
521 return get_named_section (decl
, buffer
, 0);
523 else if (symtab_node::get (decl
)->implicit_section
)
527 /* Do not try to split gnu_linkonce functions. This gets somewhat
529 if (DECL_COMDAT_GROUP (decl
) && !HAVE_COMDAT_GROUP
)
531 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
532 name
= targetm
.strip_name_encoding (name
);
533 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
539 return get_named_section (decl
, text_section_name
, 0);
542 /* Choose named function section based on its frequency. */
545 default_function_section (tree decl
, enum node_frequency freq
,
546 bool startup
, bool exit
)
548 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
549 /* Old GNU linkers have buggy --gc-section support, which sometimes
550 results in .gcc_except_table* sections being garbage collected. */
552 && symtab_node::get (decl
)->implicit_section
)
556 if (!flag_reorder_functions
557 || !targetm_common
.have_named_sections
)
559 /* Startup code should go to startup subsection unless it is
560 unlikely executed (this happens especially with function splitting
561 where we can split away unnecessary parts of static constructors. */
562 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
564 /* If we do have a profile or(and) LTO phase is executed, we do not need
565 these ELF section. */
566 if (!in_lto_p
|| !flag_profile_values
)
567 return get_named_text_section (decl
, ".text.startup", NULL
);
572 /* Similarly for exit. */
573 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
574 return get_named_text_section (decl
, ".text.exit", NULL
);
576 /* Group cold functions together, similarly for hot code. */
579 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
580 return get_named_text_section (decl
, ".text.unlikely", NULL
);
581 case NODE_FREQUENCY_HOT
:
582 /* If we do have a profile or(and) LTO phase is executed, we do not need
583 these ELF section. */
584 if (!in_lto_p
|| !flag_profile_values
)
585 return get_named_text_section (decl
, ".text.hot", NULL
);
591 /* Return the section for function DECL.
593 If DECL is NULL_TREE, return the text section. We can be passed
594 NULL_TREE under some circumstances by dbxout.c at least.
596 If FORCE_COLD is true, return cold function section ignoring
597 the frequency info of cgraph_node. */
600 function_section_1 (tree decl
, bool force_cold
)
602 section
*section
= NULL
;
603 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
604 bool startup
= false, exit
= false;
608 struct cgraph_node
*node
= cgraph_node::get (decl
);
612 freq
= node
->frequency
;
613 startup
= node
->only_called_at_startup
;
614 exit
= node
->only_called_at_exit
;
618 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
620 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
621 if (decl
!= NULL_TREE
622 && DECL_SECTION_NAME (decl
) != NULL
)
624 if (targetm
.asm_out
.function_section
)
625 section
= targetm
.asm_out
.function_section (decl
, freq
,
629 return get_named_section (decl
, NULL
, 0);
632 return targetm
.asm_out
.select_section
633 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
636 if (targetm
.asm_out
.function_section
)
637 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
640 return hot_function_section (decl
);
644 /* Return the section for function DECL.
646 If DECL is NULL_TREE, return the text section. We can be passed
647 NULL_TREE under some circumstances by dbxout.c at least. */
650 function_section (tree decl
)
652 /* Handle cases where function splitting code decides
653 to put function entry point into unlikely executed section
654 despite the fact that the function itself is not cold
655 (i.e. it is called rarely but contains a hot loop that is
656 better to live in hot subsection for the code locality). */
657 return function_section_1 (decl
,
658 first_function_block_is_cold
);
661 /* Return the section for the current function, take IN_COLD_SECTION_P
665 current_function_section (void)
667 return function_section_1 (current_function_decl
, in_cold_section_p
);
670 /* Tell assembler to switch to unlikely-to-be-executed text section. */
673 unlikely_text_section (void)
675 return function_section_1 (current_function_decl
, true);
678 /* When called within a function context, return true if the function
679 has been assigned a cold text section and if SECT is that section.
680 When called outside a function context, return true if SECT is the
681 default cold section. */
684 unlikely_text_section_p (section
*sect
)
686 return sect
== function_section_1 (current_function_decl
, true);
689 /* Return the read-only data section associated with function DECL. */
692 default_function_rodata_section (tree decl
)
694 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
696 const char *name
= DECL_SECTION_NAME (decl
);
698 if (DECL_COMDAT_GROUP (decl
) && HAVE_COMDAT_GROUP
)
704 dot
= strchr (name
+ 1, '.');
707 len
= strlen (dot
) + 8;
708 rname
= (char *) alloca (len
);
710 strcpy (rname
, ".rodata");
712 return get_section (rname
, SECTION_LINKONCE
, decl
);
714 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
715 else if (DECL_COMDAT_GROUP (decl
)
716 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
718 size_t len
= strlen (name
) + 1;
719 char *rname
= (char *) alloca (len
);
721 memcpy (rname
, name
, len
);
723 return get_section (rname
, SECTION_LINKONCE
, decl
);
725 /* For .text.foo we want to use .rodata.foo. */
726 else if (flag_function_sections
&& flag_data_sections
727 && strncmp (name
, ".text.", 6) == 0)
729 size_t len
= strlen (name
) + 1;
730 char *rname
= (char *) alloca (len
+ 2);
732 memcpy (rname
, ".rodata", 7);
733 memcpy (rname
+ 7, name
+ 5, len
- 5);
734 return get_section (rname
, 0, decl
);
738 return readonly_data_section
;
741 /* Return the read-only data section associated with function DECL
742 for targets where that section should be always the single
743 readonly data section. */
746 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
748 return readonly_data_section
;
751 /* Return the section to use for string merging. */
754 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
755 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
756 unsigned int flags ATTRIBUTE_UNUSED
)
760 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
761 && TREE_CODE (decl
) == STRING_CST
762 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
764 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
765 && TREE_STRING_LENGTH (decl
) >= len
)
767 enum machine_mode mode
;
768 unsigned int modesize
;
772 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
773 char *name
= (char *) alloca (strlen (prefix
) + 30);
775 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
776 modesize
= GET_MODE_BITSIZE (mode
);
777 if (modesize
>= 8 && modesize
<= 256
778 && (modesize
& (modesize
- 1)) == 0)
780 if (align
< modesize
)
783 str
= TREE_STRING_POINTER (decl
);
784 unit
= GET_MODE_SIZE (mode
);
786 /* Check for embedded NUL characters. */
787 for (i
= 0; i
< len
; i
+= unit
)
789 for (j
= 0; j
< unit
; j
++)
790 if (str
[i
+ j
] != '\0')
797 sprintf (name
, "%s.str%d.%d", prefix
,
798 modesize
/ 8, (int) (align
/ 8));
799 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
800 return get_section (name
, flags
, NULL
);
805 return readonly_data_section
;
808 /* Return the section to use for constant merging. */
811 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
812 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
813 unsigned int flags ATTRIBUTE_UNUSED
)
815 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
817 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
823 && (align
& (align
- 1)) == 0)
825 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
826 char *name
= (char *) alloca (strlen (prefix
) + 30);
828 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
829 flags
|= (align
/ 8) | SECTION_MERGE
;
830 return get_section (name
, flags
, NULL
);
832 return readonly_data_section
;
835 /* Given NAME, a putative register name, discard any customary prefixes. */
838 strip_reg_name (const char *name
)
840 #ifdef REGISTER_PREFIX
841 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
842 name
+= strlen (REGISTER_PREFIX
);
844 if (name
[0] == '%' || name
[0] == '#')
849 /* The user has asked for a DECL to have a particular name. Set (or
850 change) it in such a way that we don't prefix an underscore to
853 set_user_assembler_name (tree decl
, const char *name
)
855 char *starred
= (char *) alloca (strlen (name
) + 2);
857 strcpy (starred
+ 1, name
);
858 symtab
->change_decl_assembler_name (decl
, get_identifier (starred
));
859 SET_DECL_RTL (decl
, NULL_RTX
);
862 /* Decode an `asm' spec for a declaration as a register name.
863 Return the register number, or -1 if nothing specified,
864 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
865 or -3 if ASMSPEC is `cc' and is not recognized,
866 or -4 if ASMSPEC is `memory' and is not recognized.
867 Accept an exact spelling or a decimal number.
868 Prefixes such as % are optional. */
871 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
873 /* Presume just one register is clobbered. */
880 /* Get rid of confusing prefixes. */
881 asmspec
= strip_reg_name (asmspec
);
883 /* Allow a decimal number as a "register name". */
884 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
885 if (! ISDIGIT (asmspec
[i
]))
887 if (asmspec
[0] != 0 && i
< 0)
890 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0)
896 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
898 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
901 #ifdef OVERLAPPING_REGISTER_NAMES
905 const char *const name
;
908 } table
[] = OVERLAPPING_REGISTER_NAMES
;
910 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
912 && ! strcmp (asmspec
, table
[i
].name
))
914 *pnregs
= table
[i
].nregs
;
915 return table
[i
].number
;
918 #endif /* OVERLAPPING_REGISTER_NAMES */
920 #ifdef ADDITIONAL_REGISTER_NAMES
922 static const struct { const char *const name
; const int number
; } table
[]
923 = ADDITIONAL_REGISTER_NAMES
;
925 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
927 && ! strcmp (asmspec
, table
[i
].name
))
928 return table
[i
].number
;
930 #endif /* ADDITIONAL_REGISTER_NAMES */
932 if (!strcmp (asmspec
, "memory"))
935 if (!strcmp (asmspec
, "cc"))
945 decode_reg_name (const char *name
)
948 return decode_reg_name_and_count (name
, &count
);
952 /* Return true if DECL's initializer is suitable for a BSS section. */
955 bss_initializer_p (const_tree decl
)
957 return (DECL_INITIAL (decl
) == NULL
958 /* In LTO we have no errors in program; error_mark_node is used
959 to mark offlined constructors. */
960 || (DECL_INITIAL (decl
) == error_mark_node
962 || (flag_zero_initialized_in_bss
963 /* Leave constant zeroes in .rodata so they
965 && !TREE_READONLY (decl
)
966 && initializer_zerop (DECL_INITIAL (decl
))));
969 /* Compute the alignment of variable specified by DECL.
970 DONT_OUTPUT_DATA is from assemble_variable. */
973 align_variable (tree decl
, bool dont_output_data
)
975 unsigned int align
= DECL_ALIGN (decl
);
977 /* In the case for initialing an array whose length isn't specified,
978 where we have not yet been able to do the layout,
979 figure out the proper alignment now. */
980 if (dont_output_data
&& DECL_SIZE (decl
) == 0
981 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
982 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
984 /* Some object file formats have a maximum alignment which they support.
985 In particular, a.out format supports a maximum alignment of 4. */
986 if (align
> MAX_OFILE_ALIGNMENT
)
988 error ("alignment of %q+D is greater than maximum object "
989 "file alignment %d", decl
,
990 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
991 align
= MAX_OFILE_ALIGNMENT
;
994 if (! DECL_USER_ALIGN (decl
))
996 #ifdef DATA_ABI_ALIGNMENT
997 unsigned int data_abi_align
998 = DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
999 /* For backwards compatibility, don't assume the ABI alignment for
1001 if (! DECL_THREAD_LOCAL_P (decl
) || data_abi_align
<= BITS_PER_WORD
)
1002 align
= data_abi_align
;
1005 /* On some machines, it is good to increase alignment sometimes.
1006 But as DECL_ALIGN is used both for actually emitting the variable
1007 and for code accessing the variable as guaranteed alignment, we
1008 can only increase the alignment if it is a performance optimization
1009 if the references to it must bind to the current definition. */
1010 if (decl_binds_to_current_def_p (decl
)
1011 && !DECL_VIRTUAL_P (decl
))
1013 #ifdef DATA_ALIGNMENT
1014 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1015 /* Don't increase alignment too much for TLS variables - TLS space
1017 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1020 #ifdef CONSTANT_ALIGNMENT
1021 if (DECL_INITIAL (decl
) != 0
1022 /* In LTO we have no errors in program; error_mark_node is used
1023 to mark offlined constructors. */
1024 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1026 unsigned int const_align
1027 = CONSTANT_ALIGNMENT (DECL_INITIAL (decl
), align
);
1028 /* Don't increase alignment too much for TLS variables - TLS
1029 space is too precious. */
1030 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1031 align
= const_align
;
1037 /* Reset the alignment in case we have made it tighter, so we can benefit
1038 from it in get_pointer_alignment. */
1039 DECL_ALIGN (decl
) = align
;
1042 /* Return DECL_ALIGN (decl), possibly increased for optimization purposes
1043 beyond what align_variable returned. */
1046 get_variable_align (tree decl
)
1048 unsigned int align
= DECL_ALIGN (decl
);
1050 /* For user aligned vars or static vars align_variable already did
1052 if (DECL_USER_ALIGN (decl
) || !TREE_PUBLIC (decl
))
1055 #ifdef DATA_ABI_ALIGNMENT
1056 if (DECL_THREAD_LOCAL_P (decl
))
1057 align
= DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1060 /* For decls that bind to the current definition, align_variable
1061 did also everything, except for not assuming ABI required alignment
1062 of TLS variables. For other vars, increase the alignment here
1063 as an optimization. */
1064 if (!decl_binds_to_current_def_p (decl
))
1066 /* On some machines, it is good to increase alignment sometimes. */
1067 #ifdef DATA_ALIGNMENT
1068 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1069 /* Don't increase alignment too much for TLS variables - TLS space
1071 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1074 #ifdef CONSTANT_ALIGNMENT
1075 if (DECL_INITIAL (decl
) != 0
1076 /* In LTO we have no errors in program; error_mark_node is used
1077 to mark offlined constructors. */
1078 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1080 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
1082 /* Don't increase alignment too much for TLS variables - TLS space
1084 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1085 align
= const_align
;
1093 /* Return the section into which the given VAR_DECL or CONST_DECL
1094 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1095 section should be used wherever possible. */
1098 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1100 addr_space_t as
= ADDR_SPACE_GENERIC
;
1102 varpool_node
*vnode
= varpool_node::get (decl
);
1105 vnode
= vnode
->ultimate_alias_target ();
1109 if (TREE_TYPE (decl
) != error_mark_node
)
1110 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1112 /* We need the constructor to figure out reloc flag. */
1114 vnode
->get_constructor ();
1116 if (DECL_COMMON (decl
))
1118 /* If the decl has been given an explicit section name, or it resides
1119 in a non-generic address space, then it isn't common, and shouldn't
1120 be handled as such. */
1121 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1122 && ADDR_SPACE_GENERIC_P (as
));
1123 if (DECL_THREAD_LOCAL_P (decl
))
1124 return tls_comm_section
;
1125 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1126 return comm_section
;
1129 if (DECL_INITIAL (decl
) == error_mark_node
)
1130 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1131 else if (DECL_INITIAL (decl
))
1132 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1136 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1137 if (IN_NAMED_SECTION (decl
))
1138 return get_named_section (decl
, NULL
, reloc
);
1140 if (ADDR_SPACE_GENERIC_P (as
)
1141 && !DECL_THREAD_LOCAL_P (decl
)
1142 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1143 && bss_initializer_p (decl
))
1145 if (!TREE_PUBLIC (decl
)
1146 && !((flag_sanitize
& SANITIZE_ADDRESS
)
1147 && asan_protect_global (decl
)))
1148 return lcomm_section
;
1149 if (bss_noswitch_section
)
1150 return bss_noswitch_section
;
1153 return targetm
.asm_out
.select_section (decl
, reloc
,
1154 get_variable_align (decl
));
1157 /* Return the block into which object_block DECL should be placed. */
1159 static struct object_block
*
1160 get_block_for_decl (tree decl
)
1164 if (TREE_CODE (decl
) == VAR_DECL
)
1166 /* The object must be defined in this translation unit. */
1167 if (DECL_EXTERNAL (decl
))
1170 /* There's no point using object blocks for something that is
1171 isolated by definition. */
1172 if (DECL_COMDAT_GROUP (decl
))
1176 /* We can only calculate block offsets if the decl has a known
1178 if (DECL_SIZE_UNIT (decl
) == NULL
)
1180 if (!tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
)))
1183 /* Find out which section should contain DECL. We cannot put it into
1184 an object block if it requires a standalone definition. */
1185 if (TREE_CODE (decl
) == VAR_DECL
)
1186 align_variable (decl
, 0);
1187 sect
= get_variable_section (decl
, true);
1188 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1191 return get_block_for_section (sect
);
1194 /* Make sure block symbol SYMBOL is in block BLOCK. */
1197 change_symbol_block (rtx symbol
, struct object_block
*block
)
1199 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1201 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1202 SYMBOL_REF_BLOCK (symbol
) = block
;
1206 /* Return true if it is possible to put DECL in an object_block. */
1209 use_blocks_for_decl_p (tree decl
)
1211 struct symtab_node
*snode
;
1213 /* Only data DECLs can be placed into object blocks. */
1214 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1217 /* Detect decls created by dw2_force_const_mem. Such decls are
1218 special because DECL_INITIAL doesn't specify the decl's true value.
1219 dw2_output_indirect_constants will instead call assemble_variable
1220 with dont_output_data set to 1 and then print the contents itself. */
1221 if (DECL_INITIAL (decl
) == decl
)
1224 /* If this decl is an alias, then we don't want to emit a
1226 if (TREE_CODE (decl
) == VAR_DECL
1227 && (snode
= symtab_node::get (decl
)) != NULL
1231 return targetm
.use_blocks_for_decl_p (decl
);
1234 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1235 have static storage duration. In other words, it should not be an
1236 automatic variable, including PARM_DECLs.
1238 There is, however, one exception: this function handles variables
1239 explicitly placed in a particular register by the user.
1241 This is never called for PARM_DECL nodes. */
1244 make_decl_rtl (tree decl
)
1246 const char *name
= 0;
1250 /* Check that we are not being given an automatic variable. */
1251 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1252 && TREE_CODE (decl
) != RESULT_DECL
);
1254 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1255 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1256 || TREE_STATIC (decl
)
1257 || TREE_PUBLIC (decl
)
1258 || DECL_EXTERNAL (decl
)
1259 || DECL_REGISTER (decl
));
1261 /* And that we were not given a type or a label. */
1262 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1263 && TREE_CODE (decl
) != LABEL_DECL
);
1265 /* For a duplicate declaration, we can be called twice on the
1266 same DECL node. Don't discard the RTL already made. */
1267 if (DECL_RTL_SET_P (decl
))
1269 /* If the old RTL had the wrong mode, fix the mode. */
1270 x
= DECL_RTL (decl
);
1271 if (GET_MODE (x
) != DECL_MODE (decl
))
1272 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1274 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1277 /* ??? Another way to do this would be to maintain a hashed
1278 table of such critters. Instead of adding stuff to a DECL
1279 to give certain attributes to it, we could use an external
1280 hash map from DECL to set of attributes. */
1282 /* Let the target reassign the RTL if it wants.
1283 This is necessary, for example, when one machine specific
1284 decl attribute overrides another. */
1285 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1287 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1288 on the new decl information. */
1290 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1291 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1292 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1297 /* If this variable belongs to the global constant pool, retrieve the
1298 pre-computed RTL or recompute it in LTO mode. */
1299 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_IN_CONSTANT_POOL (decl
))
1301 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1305 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
1307 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1308 && DECL_REGISTER (decl
))
1310 error ("register name not specified for %q+D", decl
);
1312 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1314 const char *asmspec
= name
+1;
1315 enum machine_mode mode
= DECL_MODE (decl
);
1316 reg_number
= decode_reg_name (asmspec
);
1317 /* First detect errors in declaring global registers. */
1318 if (reg_number
== -1)
1319 error ("register name not specified for %q+D", decl
);
1320 else if (reg_number
< 0)
1321 error ("invalid register name for %q+D", decl
);
1322 else if (mode
== BLKmode
)
1323 error ("data type of %q+D isn%'t suitable for a register",
1325 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1326 error ("the register specified for %q+D cannot be accessed"
1327 " by the current target", decl
);
1328 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1329 error ("the register specified for %q+D is not general enough"
1330 " to be used as a register variable", decl
);
1331 else if (!HARD_REGNO_MODE_OK (reg_number
, mode
))
1332 error ("register specified for %q+D isn%'t suitable for data type",
1334 /* Now handle properly declared static register variables. */
1339 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1341 DECL_INITIAL (decl
) = 0;
1342 error ("global register variable has initial value");
1344 if (TREE_THIS_VOLATILE (decl
))
1345 warning (OPT_Wvolatile_register_var
,
1346 "optimization may eliminate reads and/or "
1347 "writes to register variables");
1349 /* If the user specified one of the eliminables registers here,
1350 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1351 confused with that register and be eliminated. This usage is
1352 somewhat suspect... */
1354 SET_DECL_RTL (decl
, gen_rtx_raw_REG (mode
, reg_number
));
1355 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1356 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1358 if (TREE_STATIC (decl
))
1360 /* Make this register global, so not usable for anything
1362 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1363 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1364 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1366 nregs
= hard_regno_nregs
[reg_number
][mode
];
1368 globalize_reg (decl
, reg_number
+ --nregs
);
1371 /* As a register variable, it has no section. */
1374 /* Avoid internal errors from invalid register
1376 SET_DECL_ASSEMBLER_NAME (decl
, NULL_TREE
);
1377 DECL_HARD_REGISTER (decl
) = 0;
1380 /* Now handle ordinary static variables and functions (in memory).
1381 Also handle vars declared register invalidly. */
1382 else if (name
[0] == '*')
1384 #ifdef REGISTER_PREFIX
1385 if (strlen (REGISTER_PREFIX
) != 0)
1387 reg_number
= decode_reg_name (name
);
1388 if (reg_number
>= 0 || reg_number
== -3)
1389 error ("register name given for non-register variable %q+D", decl
);
1394 /* Specifying a section attribute on a variable forces it into a
1395 non-.bss section, and thus it cannot be common. */
1396 /* FIXME: In general this code should not be necessary because
1397 visibility pass is doing the same work. But notice_global_symbol
1398 is called early and it needs to make DECL_RTL to get the name.
1399 we take care of recomputing the DECL_RTL after visibility is changed. */
1400 if (TREE_CODE (decl
) == VAR_DECL
1401 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
))
1402 && DECL_SECTION_NAME (decl
) != NULL
1403 && DECL_INITIAL (decl
) == NULL_TREE
1404 && DECL_COMMON (decl
))
1405 DECL_COMMON (decl
) = 0;
1407 /* Variables can't be both common and weak. */
1408 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1409 DECL_COMMON (decl
) = 0;
1411 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1412 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1415 enum machine_mode address_mode
= Pmode
;
1416 if (TREE_TYPE (decl
) != error_mark_node
)
1418 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1419 address_mode
= targetm
.addr_space
.address_mode (as
);
1421 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1423 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1424 SET_SYMBOL_REF_DECL (x
, decl
);
1426 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1427 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1428 set_mem_attributes (x
, decl
, 1);
1429 SET_DECL_RTL (decl
, x
);
1431 /* Optionally set flags or add text to the name to record information
1432 such as that it is a function name.
1433 If the name is changed, the macro ASM_OUTPUT_LABELREF
1434 will have to know how to strip this information. */
1435 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1438 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1439 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1443 make_decl_rtl_for_debug (tree decl
)
1445 unsigned int save_aliasing_flag
;
1448 if (DECL_RTL_SET_P (decl
))
1449 return DECL_RTL (decl
);
1451 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1452 call new_alias_set. If running with -fcompare-debug, sometimes
1453 we do not want to create alias sets that will throw the alias
1454 numbers off in the comparison dumps. So... clearing
1455 flag_strict_aliasing will keep new_alias_set() from creating a
1457 save_aliasing_flag
= flag_strict_aliasing
;
1458 flag_strict_aliasing
= 0;
1460 rtl
= DECL_RTL (decl
);
1461 /* Reset DECL_RTL back, as various parts of the compiler expects
1462 DECL_RTL set meaning it is actually going to be output. */
1463 SET_DECL_RTL (decl
, NULL
);
1465 flag_strict_aliasing
= save_aliasing_flag
;
1469 /* Output a string of literal assembler code
1470 for an `asm' keyword used between functions. */
1473 assemble_asm (tree string
)
1478 if (TREE_CODE (string
) == ADDR_EXPR
)
1479 string
= TREE_OPERAND (string
, 0);
1481 p
= TREE_STRING_POINTER (string
);
1482 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1485 /* Write the address of the entity given by SYMBOL to SEC. */
1487 assemble_addr_to_section (rtx symbol
, section
*sec
)
1489 switch_to_section (sec
);
1490 assemble_align (POINTER_SIZE
);
1491 assemble_integer (symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1494 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1495 not) section for PRIORITY. */
1497 get_cdtor_priority_section (int priority
, bool constructor_p
)
1501 /* ??? This only works reliably with the GNU linker. */
1502 sprintf (buf
, "%s.%.5u",
1503 constructor_p
? ".ctors" : ".dtors",
1504 /* Invert the numbering so the linker puts us in the proper
1505 order; constructors are run from right to left, and the
1506 linker sorts in increasing order. */
1507 MAX_INIT_PRIORITY
- priority
);
1508 return get_section (buf
, SECTION_WRITE
, NULL
);
1512 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1516 if (priority
!= DEFAULT_INIT_PRIORITY
)
1517 sec
= get_cdtor_priority_section (priority
,
1518 /*constructor_p=*/false);
1520 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1522 assemble_addr_to_section (symbol
, sec
);
1525 #ifdef DTORS_SECTION_ASM_OP
1527 default_dtor_section_asm_out_destructor (rtx symbol
,
1528 int priority ATTRIBUTE_UNUSED
)
1530 assemble_addr_to_section (symbol
, dtors_section
);
1535 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1539 if (priority
!= DEFAULT_INIT_PRIORITY
)
1540 sec
= get_cdtor_priority_section (priority
,
1541 /*constructor_p=*/true);
1543 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1545 assemble_addr_to_section (symbol
, sec
);
1548 #ifdef CTORS_SECTION_ASM_OP
1550 default_ctor_section_asm_out_constructor (rtx symbol
,
1551 int priority ATTRIBUTE_UNUSED
)
1553 assemble_addr_to_section (symbol
, ctors_section
);
1557 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1558 a nonzero value if the constant pool should be output before the
1559 start of the function, or a zero value if the pool should output
1560 after the end of the function. The default is to put it before the
1563 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1564 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1567 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1568 to be output to assembler.
1569 Set first_global_object_name and weak_global_object_name as appropriate. */
1572 notice_global_symbol (tree decl
)
1574 const char **type
= &first_global_object_name
;
1576 if (first_global_object_name
1577 || !TREE_PUBLIC (decl
)
1578 || DECL_EXTERNAL (decl
)
1579 || !DECL_NAME (decl
)
1580 || (TREE_CODE (decl
) != FUNCTION_DECL
1581 && (TREE_CODE (decl
) != VAR_DECL
1582 || (DECL_COMMON (decl
)
1583 && (DECL_INITIAL (decl
) == 0
1584 || DECL_INITIAL (decl
) == error_mark_node
))))
1585 || !MEM_P (DECL_RTL (decl
)))
1588 /* We win when global object is found, but it is useful to know about weak
1589 symbol as well so we can produce nicer unique names. */
1590 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1591 type
= &weak_global_object_name
;
1597 rtx decl_rtl
= DECL_RTL (decl
);
1599 p
= targetm
.strip_name_encoding (XSTR (XEXP (decl_rtl
, 0), 0));
1600 name
= ggc_strdup (p
);
1606 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1607 current function goes into the cold section, so that targets can use
1608 current_function_section during RTL expansion. DECL describes the
1612 decide_function_section (tree decl
)
1614 first_function_block_is_cold
= false;
1616 if (flag_reorder_blocks_and_partition
)
1617 /* We will decide in assemble_start_function. */
1620 if (DECL_SECTION_NAME (decl
))
1622 struct cgraph_node
*node
= cgraph_node::get (current_function_decl
);
1623 /* Calls to function_section rely on first_function_block_is_cold
1625 first_function_block_is_cold
= (node
1627 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1630 in_cold_section_p
= first_function_block_is_cold
;
1633 /* Output assembler code for the constant pool of a function and associated
1634 with defining the name of the function. DECL describes the function.
1635 NAME is the function's name. For the constant pool, we use the current
1636 constant pool data. */
1639 assemble_start_function (tree decl
, const char *fnname
)
1642 char tmp_label
[100];
1643 bool hot_label_written
= false;
1645 if (flag_reorder_blocks_and_partition
)
1647 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1648 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1649 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1650 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1651 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1652 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1653 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1654 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1659 crtl
->subsections
.hot_section_label
= NULL
;
1660 crtl
->subsections
.cold_section_label
= NULL
;
1661 crtl
->subsections
.hot_section_end_label
= NULL
;
1662 crtl
->subsections
.cold_section_end_label
= NULL
;
1665 /* The following code does not need preprocessing in the assembler. */
1669 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1670 output_constant_pool (fnname
, decl
);
1672 /* Make sure the not and cold text (code) sections are properly
1673 aligned. This is necessary here in the case where the function
1674 has both hot and cold sections, because we don't want to re-set
1675 the alignment when the section switch happens mid-function. */
1677 if (flag_reorder_blocks_and_partition
)
1679 first_function_block_is_cold
= false;
1681 switch_to_section (unlikely_text_section ());
1682 assemble_align (DECL_ALIGN (decl
));
1683 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1685 /* When the function starts with a cold section, we need to explicitly
1686 align the hot section and write out the hot section label.
1687 But if the current function is a thunk, we do not have a CFG. */
1689 && BB_PARTITION (ENTRY_BLOCK_PTR_FOR_FN (cfun
)->next_bb
) == BB_COLD_PARTITION
)
1691 switch_to_section (text_section
);
1692 assemble_align (DECL_ALIGN (decl
));
1693 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1694 hot_label_written
= true;
1695 first_function_block_is_cold
= true;
1697 in_cold_section_p
= first_function_block_is_cold
;
1701 /* Switch to the correct text section for the start of the function. */
1703 switch_to_section (function_section (decl
));
1704 if (flag_reorder_blocks_and_partition
1705 && !hot_label_written
)
1706 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1708 /* Tell assembler to move to target machine's alignment for functions. */
1709 align
= floor_log2 (DECL_ALIGN (decl
) / BITS_PER_UNIT
);
1712 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1715 /* Handle a user-specified function alignment.
1716 Note that we still need to align to DECL_ALIGN, as above,
1717 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1718 if (! DECL_USER_ALIGN (decl
)
1719 && align_functions_log
> align
1720 && optimize_function_for_speed_p (cfun
))
1722 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1723 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1724 align_functions_log
, align_functions
- 1);
1726 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1730 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1731 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1734 if (!DECL_IGNORED_P (decl
))
1735 (*debug_hooks
->begin_function
) (decl
);
1737 /* Make function name accessible from other files, if appropriate. */
1739 if (TREE_PUBLIC (decl
))
1741 notice_global_symbol (decl
);
1743 globalize_decl (decl
);
1745 maybe_assemble_visibility (decl
);
1748 if (DECL_PRESERVE_P (decl
))
1749 targetm
.asm_out
.mark_decl_preserved (fnname
);
1751 /* Do any machine/system dependent processing of the function name. */
1752 #ifdef ASM_DECLARE_FUNCTION_NAME
1753 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1755 /* Standard thing is just output label for the function. */
1756 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1757 #endif /* ASM_DECLARE_FUNCTION_NAME */
1759 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1760 saw_no_split_stack
= true;
1763 /* Output assembler code associated with defining the size of the
1764 function. DECL describes the function. NAME is the function's name. */
1767 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1769 #ifdef ASM_DECLARE_FUNCTION_SIZE
1770 /* We could have switched section in the middle of the function. */
1771 if (flag_reorder_blocks_and_partition
)
1772 switch_to_section (function_section (decl
));
1773 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1775 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1777 output_constant_pool (fnname
, decl
);
1778 switch_to_section (function_section (decl
)); /* need to switch back */
1780 /* Output labels for end of hot/cold text sections (to be used by
1782 if (flag_reorder_blocks_and_partition
)
1784 section
*save_text_section
;
1786 save_text_section
= in_section
;
1787 switch_to_section (unlikely_text_section ());
1788 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1789 if (first_function_block_is_cold
)
1790 switch_to_section (text_section
);
1792 switch_to_section (function_section (decl
));
1793 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1794 switch_to_section (save_text_section
);
1798 /* Assemble code to leave SIZE bytes of zeros. */
1801 assemble_zeros (unsigned HOST_WIDE_INT size
)
1803 /* Do no output if -fsyntax-only. */
1804 if (flag_syntax_only
)
1807 #ifdef ASM_NO_SKIP_IN_TEXT
1808 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1809 so we must output 0s explicitly in the text section. */
1810 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1812 unsigned HOST_WIDE_INT i
;
1813 for (i
= 0; i
< size
; i
++)
1814 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1819 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1822 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1825 assemble_align (int align
)
1827 if (align
> BITS_PER_UNIT
)
1829 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1833 /* Assemble a string constant with the specified C string as contents. */
1836 assemble_string (const char *p
, int size
)
1841 /* If the string is very long, split it up. */
1845 int thissize
= size
- pos
;
1846 if (thissize
> maximum
)
1849 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1857 /* A noswitch_section_callback for lcomm_section. */
1860 emit_local (tree decl ATTRIBUTE_UNUSED
,
1861 const char *name ATTRIBUTE_UNUSED
,
1862 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1863 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1865 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1866 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1867 size
, DECL_ALIGN (decl
));
1869 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1870 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1873 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1878 /* A noswitch_section_callback for bss_noswitch_section. */
1880 #if defined ASM_OUTPUT_ALIGNED_BSS
1882 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1883 const char *name ATTRIBUTE_UNUSED
,
1884 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1885 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1887 #if defined ASM_OUTPUT_ALIGNED_BSS
1888 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
,
1889 get_variable_align (decl
));
1895 /* A noswitch_section_callback for comm_section. */
1898 emit_common (tree decl ATTRIBUTE_UNUSED
,
1899 const char *name ATTRIBUTE_UNUSED
,
1900 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1901 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1903 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1904 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1905 size
, get_variable_align (decl
));
1907 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1908 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
,
1909 get_variable_align (decl
));
1912 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1917 /* A noswitch_section_callback for tls_comm_section. */
1920 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1921 const char *name ATTRIBUTE_UNUSED
,
1922 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1923 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1925 #ifdef ASM_OUTPUT_TLS_COMMON
1926 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
1929 sorry ("thread-local COMMON data not implemented");
1934 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1935 NAME is the name of DECL's SYMBOL_REF. */
1938 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
,
1941 unsigned HOST_WIDE_INT size
, rounded
;
1943 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
1946 if ((flag_sanitize
& SANITIZE_ADDRESS
) && asan_protect_global (decl
))
1947 size
+= asan_red_zone_size (size
);
1949 /* Don't allocate zero bytes of common,
1950 since that means "undefined external" in the linker. */
1954 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1955 so that each uninitialized object starts on such a boundary. */
1956 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
1957 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
1958 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
1960 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
1961 && (unsigned HOST_WIDE_INT
) (align
/ BITS_PER_UNIT
) > rounded
)
1962 error ("requested alignment for %q+D is greater than "
1963 "implemented alignment of %wu", decl
, rounded
);
1966 /* A subroutine of assemble_variable. Output the label and contents of
1967 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1968 is as for assemble_variable. */
1971 assemble_variable_contents (tree decl
, const char *name
,
1972 bool dont_output_data
)
1974 /* Do any machine/system dependent processing of the object. */
1975 #ifdef ASM_DECLARE_OBJECT_NAME
1976 last_assemble_variable_decl
= decl
;
1977 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
1979 /* Standard thing is just output label for the object. */
1980 ASM_OUTPUT_LABEL (asm_out_file
, name
);
1981 #endif /* ASM_DECLARE_OBJECT_NAME */
1983 if (!dont_output_data
)
1985 /* Caller is supposed to use varpool_get_constructor when it wants
1986 to output the body. */
1987 gcc_assert (!in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
);
1988 if (DECL_INITIAL (decl
)
1989 && DECL_INITIAL (decl
) != error_mark_node
1990 && !initializer_zerop (DECL_INITIAL (decl
)))
1991 /* Output the actual data. */
1992 output_constant (DECL_INITIAL (decl
),
1993 tree_to_uhwi (DECL_SIZE_UNIT (decl
)),
1994 get_variable_align (decl
));
1996 /* Leave space for it. */
1997 assemble_zeros (tree_to_uhwi (DECL_SIZE_UNIT (decl
)));
2001 /* Assemble everything that is needed for a variable or function declaration.
2002 Not used for automatic variables, and not used for function definitions.
2003 Should not be called for variables of incomplete structure type.
2005 TOP_LEVEL is nonzero if this variable has file scope.
2006 AT_END is nonzero if this is the special handling, at end of compilation,
2007 to define things that have had only tentative definitions.
2008 DONT_OUTPUT_DATA if nonzero means don't actually output the
2009 initial value (that will be done by the caller). */
2012 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
2013 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
2016 rtx decl_rtl
, symbol
;
2019 bool asan_protected
= false;
2021 /* This function is supposed to handle VARIABLES. Ensure we have one. */
2022 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
2024 /* Emulated TLS had better not get this far. */
2025 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
2027 last_assemble_variable_decl
= 0;
2029 /* Normally no need to say anything here for external references,
2030 since assemble_external is called by the language-specific code
2031 when a declaration is first seen. */
2033 if (DECL_EXTERNAL (decl
))
2036 /* Do nothing for global register variables. */
2037 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
2039 TREE_ASM_WRITTEN (decl
) = 1;
2043 /* If type was incomplete when the variable was declared,
2044 see if it is complete now. */
2046 if (DECL_SIZE (decl
) == 0)
2047 layout_decl (decl
, 0);
2049 /* Still incomplete => don't allocate it; treat the tentative defn
2050 (which is what it must have been) as an `extern' reference. */
2052 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2054 error ("storage size of %q+D isn%'t known", decl
);
2055 TREE_ASM_WRITTEN (decl
) = 1;
2059 /* The first declaration of a variable that comes through this function
2060 decides whether it is global (in C, has external linkage)
2061 or local (in C, has internal linkage). So do nothing more
2062 if this function has already run. */
2064 if (TREE_ASM_WRITTEN (decl
))
2067 /* Make sure targetm.encode_section_info is invoked before we set
2069 decl_rtl
= DECL_RTL (decl
);
2071 TREE_ASM_WRITTEN (decl
) = 1;
2073 /* Do no output if -fsyntax-only. */
2074 if (flag_syntax_only
)
2077 if (! dont_output_data
2078 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
2080 error ("size of variable %q+D is too large", decl
);
2084 gcc_assert (MEM_P (decl_rtl
));
2085 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2086 symbol
= XEXP (decl_rtl
, 0);
2088 /* If this symbol belongs to the tree constant pool, output the constant
2089 if it hasn't already been written. */
2090 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
2092 tree decl
= SYMBOL_REF_DECL (symbol
);
2093 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
2094 output_constant_def_contents (symbol
);
2100 name
= XSTR (symbol
, 0);
2101 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2102 notice_global_symbol (decl
);
2104 /* Compute the alignment of this data. */
2106 align_variable (decl
, dont_output_data
);
2108 if ((flag_sanitize
& SANITIZE_ADDRESS
)
2109 && asan_protect_global (decl
))
2111 asan_protected
= true;
2112 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
2113 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
2116 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2118 align
= get_variable_align (decl
);
2120 if (TREE_PUBLIC (decl
))
2121 maybe_assemble_visibility (decl
);
2123 if (DECL_PRESERVE_P (decl
))
2124 targetm
.asm_out
.mark_decl_preserved (name
);
2126 /* First make the assembler name(s) global if appropriate. */
2127 sect
= get_variable_section (decl
, false);
2128 if (TREE_PUBLIC (decl
)
2129 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2130 globalize_decl (decl
);
2132 /* Output any data that we will need to use the address of. */
2133 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2134 output_addressed_constants (DECL_INITIAL (decl
));
2136 /* dbxout.c needs to know this. */
2137 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2138 DECL_IN_TEXT_SECTION (decl
) = 1;
2140 /* If the decl is part of an object_block, make sure that the decl
2141 has been positioned within its block, but do not write out its
2142 definition yet. output_object_blocks will do that later. */
2143 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2145 gcc_assert (!dont_output_data
);
2146 place_block_symbol (symbol
);
2148 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2149 assemble_noswitch_variable (decl
, name
, sect
, align
);
2152 /* The following bit of code ensures that vtable_map
2153 variables are not only in the comdat section, but that
2154 each variable has its own unique comdat name. If this
2155 code is removed, the variables end up in the same section
2156 with a single comdat name.
2158 FIXME: resolve_unique_section needs to deal better with
2159 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
2160 that is fixed, this if-else statement can be replaced with
2161 a single call to "switch_to_section (sect)". */
2162 if (sect
->named
.name
2163 && (strcmp (sect
->named
.name
, ".vtable_map_vars") == 0))
2165 #if defined (OBJECT_FORMAT_ELF)
2166 targetm
.asm_out
.named_section (sect
->named
.name
,
2167 sect
->named
.common
.flags
2172 switch_to_section (sect
);
2176 switch_to_section (sect
);
2177 if (align
> BITS_PER_UNIT
)
2178 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
2179 assemble_variable_contents (decl
, name
, dont_output_data
);
2182 unsigned HOST_WIDE_INT
int size
2183 = tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2184 assemble_zeros (asan_red_zone_size (size
));
2190 /* Given a function declaration (FN_DECL), this function assembles the
2191 function into the .preinit_array section. */
2194 assemble_vtv_preinit_initializer (tree fn_decl
)
2197 unsigned flags
= SECTION_WRITE
;
2198 rtx symbol
= XEXP (DECL_RTL (fn_decl
), 0);
2200 flags
|= SECTION_NOTYPE
;
2201 sect
= get_section (".preinit_array", flags
, fn_decl
);
2202 switch_to_section (sect
);
2203 assemble_addr_to_section (symbol
, sect
);
2206 /* Return 1 if type TYPE contains any pointers. */
2209 contains_pointers_p (tree type
)
2211 switch (TREE_CODE (type
))
2214 case REFERENCE_TYPE
:
2215 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2216 so I'll play safe and return 1. */
2222 case QUAL_UNION_TYPE
:
2225 /* For a type that has fields, see if the fields have pointers. */
2226 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2227 if (TREE_CODE (fields
) == FIELD_DECL
2228 && contains_pointers_p (TREE_TYPE (fields
)))
2234 /* An array type contains pointers if its element type does. */
2235 return contains_pointers_p (TREE_TYPE (type
));
2242 /* We delay assemble_external processing until
2243 the compilation unit is finalized. This is the best we can do for
2244 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2245 it all the way to final. See PR 17982 for further discussion. */
2246 static GTY(()) tree pending_assemble_externals
;
2248 #ifdef ASM_OUTPUT_EXTERNAL
2249 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2250 As a result, assemble_external can be called after the list of externals
2251 is processed and the pointer set destroyed. */
2252 static bool pending_assemble_externals_processed
;
2254 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2255 TREE_LIST in assemble_external. */
2256 static hash_set
<tree
> *pending_assemble_externals_set
;
2258 /* True if DECL is a function decl for which no out-of-line copy exists.
2259 It is assumed that DECL's assembler name has been set. */
2262 incorporeal_function_p (tree decl
)
2264 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2268 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2269 && (DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
2270 || DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA_WITH_ALIGN
))
2273 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2274 /* Atomic or sync builtins which have survived this far will be
2275 resolved externally and therefore are not incorporeal. */
2276 if (strncmp (name
, "__builtin_", 10) == 0)
2282 /* Actually do the tests to determine if this is necessary, and invoke
2283 ASM_OUTPUT_EXTERNAL. */
2285 assemble_external_real (tree decl
)
2287 rtx rtl
= DECL_RTL (decl
);
2289 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2290 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2291 && !incorporeal_function_p (decl
))
2293 /* Some systems do require some output. */
2294 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2295 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2301 process_pending_assemble_externals (void)
2303 #ifdef ASM_OUTPUT_EXTERNAL
2305 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2306 assemble_external_real (TREE_VALUE (list
));
2308 pending_assemble_externals
= 0;
2309 pending_assemble_externals_processed
= true;
2310 delete pending_assemble_externals_set
;
2314 /* This TREE_LIST contains any weak symbol declarations waiting
2316 static GTY(()) tree weak_decls
;
2318 /* Output something to declare an external symbol to the assembler,
2319 and qualifiers such as weakness. (Most assemblers don't need
2320 extern declaration, so we normally output nothing.) Do nothing if
2321 DECL is not external. */
2324 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2326 /* Make sure that the ASM_OUT_FILE is open.
2327 If it's not, we should not be calling this function. */
2328 gcc_assert (asm_out_file
);
2330 /* In a perfect world, the following condition would be true.
2331 Sadly, the Java and Go front ends emit assembly *from the front end*,
2332 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2334 /* This function should only be called if we are expanding, or have
2336 Ideally, only final.c would be calling this function, but it is
2337 not clear whether that would break things somehow. See PR 17982
2338 for further discussion. */
2339 gcc_assert (state
== EXPANSION
2340 || state
== FINISHED
);
2343 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2346 /* We want to output annotation for weak and external symbols at
2347 very last to check if they are references or not. */
2349 if (TARGET_SUPPORTS_WEAK
2351 /* TREE_STATIC is a weird and abused creature which is not
2352 generally the right test for whether an entity has been
2353 locally emitted, inlined or otherwise not-really-extern, but
2354 for declarations that can be weak, it happens to be
2356 && !TREE_STATIC (decl
)
2357 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2358 && value_member (decl
, weak_decls
) == NULL_TREE
)
2359 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2361 #ifdef ASM_OUTPUT_EXTERNAL
2362 if (pending_assemble_externals_processed
)
2364 assemble_external_real (decl
);
2368 if (! pending_assemble_externals_set
->add (decl
))
2369 pending_assemble_externals
= tree_cons (NULL
, decl
,
2370 pending_assemble_externals
);
2374 /* Similar, for calling a library function FUN. */
2377 assemble_external_libcall (rtx fun
)
2379 /* Declare library function name external when first used, if nec. */
2380 if (! SYMBOL_REF_USED (fun
))
2382 SYMBOL_REF_USED (fun
) = 1;
2383 targetm
.asm_out
.external_libcall (fun
);
2387 /* Assemble a label named NAME. */
2390 assemble_label (FILE *file
, const char *name
)
2392 ASM_OUTPUT_LABEL (file
, name
);
2395 /* Set the symbol_referenced flag for ID. */
2397 mark_referenced (tree id
)
2399 TREE_SYMBOL_REFERENCED (id
) = 1;
2402 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2404 mark_decl_referenced (tree decl
)
2406 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2408 /* Extern inline functions don't become needed when referenced.
2409 If we know a method will be emitted in other TU and no new
2410 functions can be marked reachable, just use the external
2412 struct cgraph_node
*node
= cgraph_node::get_create (decl
);
2413 if (!DECL_EXTERNAL (decl
)
2414 && !node
->definition
)
2415 node
->mark_force_output ();
2417 else if (TREE_CODE (decl
) == VAR_DECL
)
2419 varpool_node
*node
= varpool_node::get_create (decl
);
2420 /* C++ frontend use mark_decl_references to force COMDAT variables
2421 to be output that might appear dead otherwise. */
2422 node
->force_output
= true;
2424 /* else do nothing - we can get various sorts of CST nodes here,
2425 which do not need to be marked. */
2429 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2430 until we find an identifier that is not itself a transparent alias.
2431 Modify the alias passed to it by reference (and all aliases on the
2432 way to the ultimate target), such that they do not have to be
2433 followed again, and return the ultimate target of the alias
2437 ultimate_transparent_alias_target (tree
*alias
)
2439 tree target
= *alias
;
2441 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
2443 gcc_assert (TREE_CHAIN (target
));
2444 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
2445 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
2446 && ! TREE_CHAIN (target
));
2453 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2454 starts with a *, the rest of NAME is output verbatim. Otherwise
2455 NAME is transformed in a target-specific way (usually by the
2456 addition of an underscore). */
2459 assemble_name_raw (FILE *file
, const char *name
)
2462 fputs (&name
[1], file
);
2464 ASM_OUTPUT_LABELREF (file
, name
);
2467 /* Like assemble_name_raw, but should be used when NAME might refer to
2468 an entity that is also represented as a tree (like a function or
2469 variable). If NAME does refer to such an entity, that entity will
2470 be marked as referenced. */
2473 assemble_name (FILE *file
, const char *name
)
2475 const char *real_name
;
2478 real_name
= targetm
.strip_name_encoding (name
);
2480 id
= maybe_get_identifier (real_name
);
2485 mark_referenced (id
);
2486 ultimate_transparent_alias_target (&id
);
2488 name
= IDENTIFIER_POINTER (id
);
2489 gcc_assert (! TREE_CHAIN (id
));
2492 assemble_name_raw (file
, name
);
2495 /* Allocate SIZE bytes writable static space with a gensym name
2496 and return an RTX to refer to its address. */
2499 assemble_static_space (unsigned HOST_WIDE_INT size
)
2502 const char *namestring
;
2505 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2507 namestring
= ggc_strdup (name
);
2509 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2510 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2512 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2513 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2516 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2517 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2520 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2521 so that each uninitialized object starts on such a boundary. */
2522 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2523 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2524 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2525 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2526 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2527 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2534 /* Assemble the static constant template for function entry trampolines.
2535 This is done at most once per compilation.
2536 Returns an RTX for the address of the template. */
2538 static GTY(()) rtx initial_trampoline
;
2541 assemble_trampoline_template (void)
2548 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2550 if (initial_trampoline
)
2551 return initial_trampoline
;
2553 /* By default, put trampoline templates in read-only data section. */
2555 #ifdef TRAMPOLINE_SECTION
2556 switch_to_section (TRAMPOLINE_SECTION
);
2558 switch_to_section (readonly_data_section
);
2561 /* Write the assembler code to define one. */
2562 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2564 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2566 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2567 targetm
.asm_out
.trampoline_template (asm_out_file
);
2569 /* Record the rtl to refer to it. */
2570 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2571 name
= ggc_strdup (label
);
2572 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2573 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2575 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2576 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2577 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2579 return initial_trampoline
;
2582 /* A and B are either alignments or offsets. Return the minimum alignment
2583 that may be assumed after adding the two together. */
2585 static inline unsigned
2586 min_align (unsigned int a
, unsigned int b
)
2588 return (a
| b
) & -(a
| b
);
2591 /* Return the assembler directive for creating a given kind of integer
2592 object. SIZE is the number of bytes in the object and ALIGNED_P
2593 indicates whether it is known to be aligned. Return NULL if the
2594 assembly dialect has no such directive.
2596 The returned string should be printed at the start of a new line and
2597 be followed immediately by the object's initial value. */
2600 integer_asm_op (int size
, int aligned_p
)
2602 struct asm_int_op
*ops
;
2605 ops
= &targetm
.asm_out
.aligned_op
;
2607 ops
= &targetm
.asm_out
.unaligned_op
;
2612 return targetm
.asm_out
.byte_op
;
2626 /* Use directive OP to assemble an integer object X. Print OP at the
2627 start of the line, followed immediately by the value of X. */
2630 assemble_integer_with_op (const char *op
, rtx x
)
2632 fputs (op
, asm_out_file
);
2633 output_addr_const (asm_out_file
, x
);
2634 fputc ('\n', asm_out_file
);
2637 /* The default implementation of the asm_out.integer target hook. */
2640 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2641 unsigned int size ATTRIBUTE_UNUSED
,
2642 int aligned_p ATTRIBUTE_UNUSED
)
2644 const char *op
= integer_asm_op (size
, aligned_p
);
2645 /* Avoid GAS bugs for large values. Specifically negative values whose
2646 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2647 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE
/ BITS_PER_UNIT
)
2649 return op
&& (assemble_integer_with_op (op
, x
), true);
2652 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2653 the alignment of the integer in bits. Return 1 if we were able to output
2654 the constant, otherwise 0. We must be able to output the constant,
2655 if FORCE is nonzero. */
2658 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2662 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2664 /* See if the target hook can handle this kind of object. */
2665 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2668 /* If the object is a multi-byte one, try splitting it up. Split
2669 it into words it if is multi-word, otherwise split it into bytes. */
2672 enum machine_mode omode
, imode
;
2673 unsigned int subalign
;
2674 unsigned int subsize
, i
;
2675 enum mode_class mclass
;
2677 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2678 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2679 if (GET_CODE (x
) == CONST_FIXED
)
2680 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2684 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2685 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2687 for (i
= 0; i
< size
; i
+= subsize
)
2689 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2690 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2696 /* If we've printed some of it, but not all of it, there's no going
2701 gcc_assert (!force
);
2707 assemble_real (REAL_VALUE_TYPE d
, enum machine_mode mode
, unsigned int align
)
2709 long data
[4] = {0, 0, 0, 0};
2711 int bitsize
, nelts
, nunits
, units_per
;
2713 /* This is hairy. We have a quantity of known size. real_to_target
2714 will put it into an array of *host* longs, 32 bits per element
2715 (even if long is more than 32 bits). We need to determine the
2716 number of array elements that are occupied (nelts) and the number
2717 of *target* min-addressable units that will be occupied in the
2718 object file (nunits). We cannot assume that 32 divides the
2719 mode's bitsize (size * BITS_PER_UNIT) evenly.
2721 size * BITS_PER_UNIT is used here to make sure that padding bits
2722 (which might appear at either end of the value; real_to_target
2723 will include the padding bits in its output array) are included. */
2725 nunits
= GET_MODE_SIZE (mode
);
2726 bitsize
= nunits
* BITS_PER_UNIT
;
2727 nelts
= CEIL (bitsize
, 32);
2728 units_per
= 32 / BITS_PER_UNIT
;
2730 real_to_target (data
, &d
, mode
);
2732 /* Put out the first word with the specified alignment. */
2733 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2734 nunits
-= units_per
;
2736 /* Subsequent words need only 32-bit alignment. */
2737 align
= min_align (align
, 32);
2739 for (i
= 1; i
< nelts
; i
++)
2741 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2742 nunits
-= units_per
;
2746 /* Given an expression EXP with a constant value,
2747 reduce it to the sum of an assembler symbol and an integer.
2748 Store them both in the structure *VALUE.
2749 EXP must be reducible. */
2753 HOST_WIDE_INT offset
;
2757 decode_addr_const (tree exp
, struct addr_const
*value
)
2759 tree target
= TREE_OPERAND (exp
, 0);
2765 if (TREE_CODE (target
) == COMPONENT_REF
2766 && tree_fits_shwi_p (byte_position (TREE_OPERAND (target
, 1))))
2768 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2769 target
= TREE_OPERAND (target
, 0);
2771 else if (TREE_CODE (target
) == ARRAY_REF
2772 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2774 offset
+= (tree_to_uhwi (TYPE_SIZE_UNIT (TREE_TYPE (target
)))
2775 * tree_to_shwi (TREE_OPERAND (target
, 1)));
2776 target
= TREE_OPERAND (target
, 0);
2778 else if (TREE_CODE (target
) == MEM_REF
2779 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2781 offset
+= mem_ref_offset (target
).to_short_addr ();
2782 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2784 else if (TREE_CODE (target
) == INDIRECT_REF
2785 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2786 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2788 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2793 switch (TREE_CODE (target
))
2797 x
= DECL_RTL (target
);
2801 x
= gen_rtx_MEM (FUNCTION_MODE
,
2802 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2811 x
= output_constant_def (target
, 1);
2818 gcc_assert (MEM_P (x
));
2822 value
->offset
= offset
;
2826 static GTY((param_is (struct constant_descriptor_tree
)))
2827 htab_t const_desc_htab
;
2829 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2831 /* Constant pool accessor function. */
2834 constant_pool_htab (void)
2836 return const_desc_htab
;
2839 /* Compute a hash code for a constant expression. */
2842 const_desc_hash (const void *ptr
)
2844 return ((const struct constant_descriptor_tree
*)ptr
)->hash
;
2848 const_hash_1 (const tree exp
)
2853 enum tree_code code
= TREE_CODE (exp
);
2855 /* Either set P and LEN to the address and len of something to hash and
2856 exit the switch or return a value. */
2861 p
= (char *) &TREE_INT_CST_ELT (exp
, 0);
2862 len
= TREE_INT_CST_NUNITS (exp
) * sizeof (HOST_WIDE_INT
);
2866 return real_hash (TREE_REAL_CST_PTR (exp
));
2869 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2872 p
= TREE_STRING_POINTER (exp
);
2873 len
= TREE_STRING_LENGTH (exp
);
2877 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2878 + const_hash_1 (TREE_IMAGPART (exp
)));
2884 hi
= 7 + VECTOR_CST_NELTS (exp
);
2886 for (i
= 0; i
< VECTOR_CST_NELTS (exp
); ++i
)
2887 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ELT (exp
, i
));
2894 unsigned HOST_WIDE_INT idx
;
2897 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2899 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2901 hi
= hi
* 603 + const_hash_1 (value
);
2909 struct addr_const value
;
2911 decode_addr_const (exp
, &value
);
2912 switch (GET_CODE (value
.base
))
2915 /* Don't hash the address of the SYMBOL_REF;
2916 only use the offset and the symbol name. */
2918 p
= XSTR (value
.base
, 0);
2919 for (i
= 0; p
[i
] != 0; i
++)
2920 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2924 hi
= value
.offset
+ CODE_LABEL_NUMBER (XEXP (value
.base
, 0)) * 13;
2934 case POINTER_PLUS_EXPR
:
2936 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2937 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2940 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2943 /* A language specific constant. Just hash the code. */
2947 /* Compute hashing function. */
2949 for (i
= 0; i
< len
; i
++)
2950 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2955 /* Wrapper of compare_constant, for the htab interface. */
2957 const_desc_eq (const void *p1
, const void *p2
)
2959 const struct constant_descriptor_tree
*const c1
2960 = (const struct constant_descriptor_tree
*) p1
;
2961 const struct constant_descriptor_tree
*const c2
2962 = (const struct constant_descriptor_tree
*) p2
;
2963 if (c1
->hash
!= c2
->hash
)
2965 return compare_constant (c1
->value
, c2
->value
);
2968 /* Compare t1 and t2, and return 1 only if they are known to result in
2969 the same bit pattern on output. */
2972 compare_constant (const tree t1
, const tree t2
)
2974 enum tree_code typecode
;
2976 if (t1
== NULL_TREE
)
2977 return t2
== NULL_TREE
;
2978 if (t2
== NULL_TREE
)
2981 if (TREE_CODE (t1
) != TREE_CODE (t2
))
2984 switch (TREE_CODE (t1
))
2987 /* Integer constants are the same only if the same width of type. */
2988 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2990 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2992 return tree_int_cst_equal (t1
, t2
);
2995 /* Real constants are the same only if the same width of type. */
2996 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2999 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
3002 /* Fixed constants are the same only if the same width of type. */
3003 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3006 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
3009 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3012 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
3013 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
3014 TREE_STRING_LENGTH (t1
)));
3017 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
3018 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
3024 if (VECTOR_CST_NELTS (t1
) != VECTOR_CST_NELTS (t2
))
3027 for (i
= 0; i
< VECTOR_CST_NELTS (t1
); ++i
)
3028 if (!compare_constant (VECTOR_CST_ELT (t1
, i
),
3029 VECTOR_CST_ELT (t2
, i
)))
3037 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
3038 unsigned HOST_WIDE_INT idx
;
3040 typecode
= TREE_CODE (TREE_TYPE (t1
));
3041 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
3044 if (typecode
== ARRAY_TYPE
)
3046 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
3047 /* For arrays, check that the sizes all match. */
3048 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
3050 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
3055 /* For record and union constructors, require exact type
3057 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
3061 v1
= CONSTRUCTOR_ELTS (t1
);
3062 v2
= CONSTRUCTOR_ELTS (t2
);
3063 if (vec_safe_length (v1
) != vec_safe_length (v2
))
3066 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
3068 constructor_elt
*c1
= &(*v1
)[idx
];
3069 constructor_elt
*c2
= &(*v2
)[idx
];
3071 /* Check that each value is the same... */
3072 if (!compare_constant (c1
->value
, c2
->value
))
3074 /* ... and that they apply to the same fields! */
3075 if (typecode
== ARRAY_TYPE
)
3077 if (!compare_constant (c1
->index
, c2
->index
))
3082 if (c1
->index
!= c2
->index
)
3093 struct addr_const value1
, value2
;
3097 decode_addr_const (t1
, &value1
);
3098 decode_addr_const (t2
, &value2
);
3100 if (value1
.offset
!= value2
.offset
)
3103 code
= GET_CODE (value1
.base
);
3104 if (code
!= GET_CODE (value2
.base
))
3110 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3114 ret
= (CODE_LABEL_NUMBER (XEXP (value1
.base
, 0))
3115 == CODE_LABEL_NUMBER (XEXP (value2
.base
, 0)));
3125 case POINTER_PLUS_EXPR
:
3128 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3129 && compare_constant (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3132 case VIEW_CONVERT_EXPR
:
3133 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3142 /* Return the section into which constant EXP should be placed. */
3145 get_constant_section (tree exp
, unsigned int align
)
3147 return targetm
.asm_out
.select_section (exp
,
3148 compute_reloc_for_constant (exp
),
3152 /* Return the size of constant EXP in bytes. */
3154 static HOST_WIDE_INT
3155 get_constant_size (tree exp
)
3159 size
= int_size_in_bytes (TREE_TYPE (exp
));
3160 if (TREE_CODE (exp
) == STRING_CST
)
3161 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3165 /* Subroutine of output_constant_def:
3166 No constant equal to EXP is known to have been output.
3167 Make a constant descriptor to enter EXP in the hash table.
3168 Assign the label number and construct RTL to refer to the
3169 constant's location in memory.
3170 Caller is responsible for updating the hash table. */
3172 static struct constant_descriptor_tree
*
3173 build_constant_desc (tree exp
)
3175 struct constant_descriptor_tree
*desc
;
3181 desc
= ggc_alloc
<constant_descriptor_tree
> ();
3184 /* Create a string containing the label name, in LABEL. */
3185 labelno
= const_labelno
++;
3186 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3188 /* Construct the VAR_DECL associated with the constant. */
3189 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3191 DECL_ARTIFICIAL (decl
) = 1;
3192 DECL_IGNORED_P (decl
) = 1;
3193 TREE_READONLY (decl
) = 1;
3194 TREE_STATIC (decl
) = 1;
3195 TREE_ADDRESSABLE (decl
) = 1;
3196 /* We don't set the RTL yet as this would cause varpool to assume that the
3197 variable is referenced. Moreover, it would just be dropped in LTO mode.
3198 Instead we set the flag that will be recognized in make_decl_rtl. */
3199 DECL_IN_CONSTANT_POOL (decl
) = 1;
3200 DECL_INITIAL (decl
) = desc
->value
;
3201 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3202 architectures so use DATA_ALIGNMENT as well, except for strings. */
3203 if (TREE_CODE (exp
) == STRING_CST
)
3205 #ifdef CONSTANT_ALIGNMENT
3206 DECL_ALIGN (decl
) = CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
));
3210 align_variable (decl
, 0);
3212 /* Now construct the SYMBOL_REF and the MEM. */
3213 if (use_object_blocks_p ())
3215 section
*sect
= get_constant_section (exp
, DECL_ALIGN (decl
));
3216 symbol
= create_block_symbol (ggc_strdup (label
),
3217 get_block_for_section (sect
), -1);
3220 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3221 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3222 SET_SYMBOL_REF_DECL (symbol
, decl
);
3223 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3225 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3226 set_mem_attributes (rtl
, exp
, 1);
3227 set_mem_alias_set (rtl
, 0);
3228 set_mem_alias_set (rtl
, const_alias_set
);
3230 /* We cannot share RTX'es in pool entries.
3231 Mark this piece of RTL as required for unsharing. */
3232 RTX_FLAG (rtl
, used
) = 1;
3234 /* Set flags or add text to the name to record information, such as
3235 that it is a local symbol. If the name is changed, the macro
3236 ASM_OUTPUT_LABELREF will have to know how to strip this
3237 information. This call might invalidate our local variable
3238 SYMBOL; we can't use it afterward. */
3239 targetm
.encode_section_info (exp
, rtl
, true);
3246 /* Return an rtx representing a reference to constant data in memory
3247 for the constant expression EXP.
3249 If assembler code for such a constant has already been output,
3250 return an rtx to refer to it.
3251 Otherwise, output such a constant in memory
3252 and generate an rtx for it.
3254 If DEFER is nonzero, this constant can be deferred and output only
3255 if referenced in the function after all optimizations.
3257 `const_desc_table' records which constants already have label strings. */
3260 output_constant_def (tree exp
, int defer
)
3262 struct constant_descriptor_tree
*desc
;
3263 struct constant_descriptor_tree key
;
3266 /* Look up EXP in the table of constant descriptors. If we didn't find
3267 it, create a new one. */
3269 key
.hash
= const_hash_1 (exp
);
3270 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3272 desc
= (struct constant_descriptor_tree
*) *loc
;
3275 desc
= build_constant_desc (exp
);
3276 desc
->hash
= key
.hash
;
3280 maybe_output_constant_def_contents (desc
, defer
);
3284 /* Subroutine of output_constant_def: Decide whether or not we need to
3285 output the constant DESC now, and if so, do it. */
3287 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3290 rtx symbol
= XEXP (desc
->rtl
, 0);
3291 tree exp
= desc
->value
;
3293 if (flag_syntax_only
)
3296 if (TREE_ASM_WRITTEN (exp
))
3297 /* Already output; don't do it again. */
3300 /* We can always defer constants as long as the context allows
3304 /* Increment n_deferred_constants if it exists. It needs to be at
3305 least as large as the number of constants actually referred to
3306 by the function. If it's too small we'll stop looking too early
3307 and fail to emit constants; if it's too large we'll only look
3308 through the entire function when we could have stopped earlier. */
3310 n_deferred_constants
++;
3314 output_constant_def_contents (symbol
);
3317 /* Subroutine of output_constant_def_contents. Output the definition
3318 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3319 constant's alignment in bits. */
3322 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3326 size
= get_constant_size (exp
);
3328 /* Do any machine/system dependent processing of the constant. */
3329 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3331 /* Output the value of EXP. */
3332 output_constant (exp
, size
, align
);
3335 /* We must output the constant data referred to by SYMBOL; do so. */
3338 output_constant_def_contents (rtx symbol
)
3340 tree decl
= SYMBOL_REF_DECL (symbol
);
3341 tree exp
= DECL_INITIAL (decl
);
3343 bool asan_protected
= false;
3345 /* Make sure any other constants whose addresses appear in EXP
3346 are assigned label numbers. */
3347 output_addressed_constants (exp
);
3349 /* We are no longer deferring this constant. */
3350 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3352 if ((flag_sanitize
& SANITIZE_ADDRESS
)
3353 && TREE_CODE (exp
) == STRING_CST
3354 && asan_protect_global (exp
))
3356 asan_protected
= true;
3357 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
3358 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
3361 /* If the constant is part of an object block, make sure that the
3362 decl has been positioned within its block, but do not write out
3363 its definition yet. output_object_blocks will do that later. */
3364 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3365 place_block_symbol (symbol
);
3368 align
= DECL_ALIGN (decl
);
3369 switch_to_section (get_constant_section (exp
, align
));
3370 if (align
> BITS_PER_UNIT
)
3371 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3372 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3375 HOST_WIDE_INT size
= get_constant_size (exp
);
3376 assemble_zeros (asan_red_zone_size (size
));
3381 /* Look up EXP in the table of constant descriptors. Return the rtl
3382 if it has been emitted, else null. */
3385 lookup_constant_def (tree exp
)
3387 struct constant_descriptor_tree
*desc
;
3388 struct constant_descriptor_tree key
;
3391 key
.hash
= const_hash_1 (exp
);
3392 desc
= (struct constant_descriptor_tree
*)
3393 htab_find_with_hash (const_desc_htab
, &key
, key
.hash
);
3395 return (desc
? desc
->rtl
: NULL_RTX
);
3398 /* Return a tree representing a reference to constant data in memory
3399 for the constant expression EXP.
3401 This is the counterpart of output_constant_def at the Tree level. */
3404 tree_output_constant_def (tree exp
)
3406 struct constant_descriptor_tree
*desc
, key
;
3410 /* Look up EXP in the table of constant descriptors. If we didn't find
3411 it, create a new one. */
3413 key
.hash
= const_hash_1 (exp
);
3414 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3416 desc
= (struct constant_descriptor_tree
*) *loc
;
3419 desc
= build_constant_desc (exp
);
3420 desc
->hash
= key
.hash
;
3424 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3425 varpool_node::finalize_decl (decl
);
3429 /* Used in the hash tables to avoid outputting the same constant
3430 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3431 are output once per function, not once per file. */
3432 /* ??? Only a few targets need per-function constant pools. Most
3433 can use one per-file pool. Should add a targetm bit to tell the
3436 struct GTY(()) rtx_constant_pool
{
3437 /* Pointers to first and last constant in pool, as ordered by offset. */
3438 struct constant_descriptor_rtx
*first
;
3439 struct constant_descriptor_rtx
*last
;
3441 /* Hash facility for making memory-constants from constant rtl-expressions.
3442 It is used on RISC machines where immediate integer arguments and
3443 constant addresses are restricted so that such constants must be stored
3445 htab_t
GTY((param_is (struct constant_descriptor_rtx
))) const_rtx_htab
;
3447 /* Current offset in constant pool (does not include any
3448 machine-specific header). */
3449 HOST_WIDE_INT offset
;
3452 struct GTY((chain_next ("%h.next"))) constant_descriptor_rtx
{
3453 struct constant_descriptor_rtx
*next
;
3457 HOST_WIDE_INT offset
;
3459 enum machine_mode mode
;
3465 /* Hash and compare functions for const_rtx_htab. */
3468 const_desc_rtx_hash (const void *ptr
)
3470 const struct constant_descriptor_rtx
*const desc
3471 = (const struct constant_descriptor_rtx
*) ptr
;
3476 const_desc_rtx_eq (const void *a
, const void *b
)
3478 const struct constant_descriptor_rtx
*const x
3479 = (const struct constant_descriptor_rtx
*) a
;
3480 const struct constant_descriptor_rtx
*const y
3481 = (const struct constant_descriptor_rtx
*) b
;
3483 if (x
->mode
!= y
->mode
)
3485 return rtx_equal_p (x
->constant
, y
->constant
);
3488 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3491 const_rtx_hash_1 (rtx
*xp
, void *data
)
3493 unsigned HOST_WIDE_INT hwi
;
3494 enum machine_mode mode
;
3501 code
= GET_CODE (x
);
3502 mode
= GET_MODE (x
);
3503 h
= (hashval_t
) code
* 1048573 + mode
;
3512 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3513 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3515 h
^= (hashval_t
) hwi
;
3516 for (i
= 1; i
< n
; ++i
)
3519 h
^= (hashval_t
) hwi
;
3524 case CONST_WIDE_INT
:
3525 hwi
= GET_MODE_PRECISION (mode
);
3527 for (i
= 0; i
< CONST_WIDE_INT_NUNITS (x
); i
++)
3528 hwi
^= CONST_WIDE_INT_ELT (x
, i
);
3533 if (TARGET_SUPPORTS_WIDE_INT
== 0 && mode
== VOIDmode
)
3535 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3539 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3543 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3549 for (i
= XVECLEN (x
, 0); i
-- > 0; )
3550 h
= h
* 251 + const_rtx_hash_1 (&XVECEXP (x
, 0, i
), data
);
3555 h
^= htab_hash_string (XSTR (x
, 0));
3559 h
= h
* 251 + CODE_LABEL_NUMBER (XEXP (x
, 0));
3563 case UNSPEC_VOLATILE
:
3564 h
= h
* 251 + XINT (x
, 1);
3571 hp
= (hashval_t
*) data
;
3572 *hp
= *hp
* 509 + h
;
3576 /* Compute a hash value for X, which should be a constant. */
3579 const_rtx_hash (rtx x
)
3582 for_each_rtx (&x
, const_rtx_hash_1
, &h
);
3587 /* Create and return a new rtx constant pool. */
3589 static struct rtx_constant_pool
*
3590 create_constant_pool (void)
3592 struct rtx_constant_pool
*pool
;
3594 pool
= ggc_alloc
<rtx_constant_pool
> ();
3595 pool
->const_rtx_htab
= htab_create_ggc (31, const_desc_rtx_hash
,
3596 const_desc_rtx_eq
, NULL
);
3603 /* Initialize constant pool hashing for a new function. */
3606 init_varasm_status (void)
3608 crtl
->varasm
.pool
= create_constant_pool ();
3609 crtl
->varasm
.deferred_constants
= 0;
3612 /* Given a MINUS expression, simplify it if both sides
3613 include the same symbol. */
3616 simplify_subtraction (rtx x
)
3618 rtx r
= simplify_rtx (x
);
3622 /* Given a constant rtx X, make (or find) a memory constant for its value
3623 and return a MEM rtx to refer to it in memory. */
3626 force_const_mem (enum machine_mode mode
, rtx x
)
3628 struct constant_descriptor_rtx
*desc
, tmp
;
3629 struct rtx_constant_pool
*pool
;
3636 /* If we're not allowed to drop X into the constant pool, don't. */
3637 if (targetm
.cannot_force_const_mem (mode
, x
))
3640 /* Record that this function has used a constant pool entry. */
3641 crtl
->uses_const_pool
= 1;
3643 /* Decide which pool to use. */
3644 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3645 ? shared_constant_pool
3646 : crtl
->varasm
.pool
);
3648 /* Lookup the value in the hashtable. */
3651 hash
= const_rtx_hash (x
);
3652 slot
= htab_find_slot_with_hash (pool
->const_rtx_htab
, &tmp
, hash
, INSERT
);
3653 desc
= (struct constant_descriptor_rtx
*) *slot
;
3655 /* If the constant was already present, return its memory. */
3657 return copy_rtx (desc
->mem
);
3659 /* Otherwise, create a new descriptor. */
3660 desc
= ggc_alloc
<constant_descriptor_rtx
> ();
3663 /* Align the location counter as required by EXP's data type. */
3664 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3665 #ifdef CONSTANT_ALIGNMENT
3667 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3668 if (type
!= NULL_TREE
)
3669 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3673 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3674 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3677 desc
->constant
= copy_rtx (tmp
.constant
);
3678 desc
->offset
= pool
->offset
;
3681 desc
->align
= align
;
3682 desc
->labelno
= const_labelno
;
3685 pool
->offset
+= GET_MODE_SIZE (mode
);
3687 pool
->last
->next
= desc
;
3689 pool
->first
= pool
->last
= desc
;
3692 /* Create a string containing the label name, in LABEL. */
3693 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3696 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3697 the constants pool. */
3698 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3700 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3701 symbol
= create_block_symbol (ggc_strdup (label
),
3702 get_block_for_section (sect
), -1);
3705 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3707 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3708 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3709 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3711 /* Construct the MEM. */
3712 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3713 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3714 set_mem_align (def
, align
);
3716 /* If we're dropping a label to the constant pool, make sure we
3718 if (GET_CODE (x
) == LABEL_REF
)
3719 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3721 return copy_rtx (def
);
3724 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3727 get_pool_constant (rtx addr
)
3729 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3732 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3733 and whether it has been output or not. */
3736 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3738 struct constant_descriptor_rtx
*desc
;
3740 desc
= SYMBOL_REF_CONSTANT (addr
);
3741 *pmarked
= (desc
->mark
!= 0);
3742 return desc
->constant
;
3745 /* Similar, return the mode. */
3748 get_pool_mode (const_rtx addr
)
3750 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3753 /* Return the size of the constant pool. */
3756 get_pool_size (void)
3758 return crtl
->varasm
.pool
->offset
;
3761 /* Worker function for output_constant_pool_1. Emit assembly for X
3762 in MODE with known alignment ALIGN. */
3765 output_constant_pool_2 (enum machine_mode mode
, rtx x
, unsigned int align
)
3767 switch (GET_MODE_CLASS (mode
))
3770 case MODE_DECIMAL_FLOAT
:
3774 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3775 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3776 assemble_real (r
, mode
, align
);
3781 case MODE_PARTIAL_INT
:
3786 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3789 case MODE_VECTOR_FLOAT
:
3790 case MODE_VECTOR_INT
:
3791 case MODE_VECTOR_FRACT
:
3792 case MODE_VECTOR_UFRACT
:
3793 case MODE_VECTOR_ACCUM
:
3794 case MODE_VECTOR_UACCUM
:
3797 enum machine_mode submode
= GET_MODE_INNER (mode
);
3798 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3800 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3801 units
= CONST_VECTOR_NUNITS (x
);
3803 for (i
= 0; i
< units
; i
++)
3805 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3806 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3816 /* Worker function for output_constant_pool. Emit constant DESC,
3817 giving it ALIGN bits of alignment. */
3820 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3827 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3828 whose CODE_LABEL has been deleted. This can occur if a jump table
3829 is eliminated by optimization. If so, write a constant of zero
3830 instead. Note that this can also happen by turning the
3831 CODE_LABEL into a NOTE. */
3832 /* ??? This seems completely and utterly wrong. Certainly it's
3833 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3834 functioning even with INSN_DELETED_P and friends. */
3837 switch (GET_CODE (tmp
))
3840 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3841 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3843 tmp
= XEXP (XEXP (tmp
, 0), 0);
3847 tmp
= XEXP (tmp
, 0);
3848 gcc_assert (!INSN_DELETED_P (tmp
));
3849 gcc_assert (!NOTE_P (tmp
)
3850 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3857 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3858 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3859 align
, desc
->labelno
, done
);
3862 assemble_align (align
);
3864 /* Output the label. */
3865 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3867 /* Output the data. */
3868 output_constant_pool_2 (desc
->mode
, x
, align
);
3870 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3871 sections have proper size. */
3872 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3874 && (in_section
->common
.flags
& SECTION_MERGE
))
3875 assemble_align (align
);
3877 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3883 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3884 to as used. Emit referenced deferred strings. This function can
3885 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3888 mark_constant (rtx
*current_rtx
, void *data ATTRIBUTE_UNUSED
)
3890 rtx x
= *current_rtx
;
3892 if (x
== NULL_RTX
|| GET_CODE (x
) != SYMBOL_REF
)
3895 if (CONSTANT_POOL_ADDRESS_P (x
))
3897 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3898 if (desc
->mark
== 0)
3901 for_each_rtx (&desc
->constant
, mark_constant
, NULL
);
3904 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3906 tree decl
= SYMBOL_REF_DECL (x
);
3907 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
3909 n_deferred_constants
--;
3910 output_constant_def_contents (x
);
3917 /* Look through appropriate parts of INSN, marking all entries in the
3918 constant pool which are actually being used. Entries that are only
3919 referenced by other constants are also marked as used. Emit
3920 deferred strings that are used. */
3923 mark_constants (rtx_insn
*insn
)
3928 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3929 insns, not any notes that may be attached. We don't want to mark
3930 a constant just because it happens to appear in a REG_EQUIV note. */
3931 if (GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3933 rtx seq
= PATTERN (insn
);
3934 int i
, n
= XVECLEN (seq
, 0);
3935 for (i
= 0; i
< n
; ++i
)
3937 rtx subinsn
= XVECEXP (seq
, 0, i
);
3938 if (INSN_P (subinsn
))
3939 for_each_rtx (&PATTERN (subinsn
), mark_constant
, NULL
);
3943 for_each_rtx (&PATTERN (insn
), mark_constant
, NULL
);
3946 /* Look through the instructions for this function, and mark all the
3947 entries in POOL which are actually being used. Emit deferred constants
3948 which have indeed been used. */
3951 mark_constant_pool (void)
3955 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
3958 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3959 mark_constants (insn
);
3962 /* Write all the constants in POOL. */
3965 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
3967 struct constant_descriptor_rtx
*desc
;
3969 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3972 /* If the constant is part of an object_block, make sure that
3973 the constant has been positioned within its block, but do not
3974 write out its definition yet. output_object_blocks will do
3976 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
3977 && SYMBOL_REF_BLOCK (desc
->sym
))
3978 place_block_symbol (desc
->sym
);
3981 switch_to_section (targetm
.asm_out
.select_rtx_section
3982 (desc
->mode
, desc
->constant
, desc
->align
));
3983 output_constant_pool_1 (desc
, desc
->align
);
3988 /* Mark all constants that are used in the current function, then write
3989 out the function's private constant pool. */
3992 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
3993 tree fndecl ATTRIBUTE_UNUSED
)
3995 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
3997 /* It is possible for gcc to call force_const_mem and then to later
3998 discard the instructions which refer to the constant. In such a
3999 case we do not need to output the constant. */
4000 mark_constant_pool ();
4002 #ifdef ASM_OUTPUT_POOL_PROLOGUE
4003 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4006 output_constant_pool_contents (pool
);
4008 #ifdef ASM_OUTPUT_POOL_EPILOGUE
4009 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4013 /* Write the contents of the shared constant pool. */
4016 output_shared_constant_pool (void)
4018 output_constant_pool_contents (shared_constant_pool
);
4021 /* Determine what kind of relocations EXP may need. */
4024 compute_reloc_for_constant (tree exp
)
4026 int reloc
= 0, reloc2
;
4029 switch (TREE_CODE (exp
))
4033 /* Go inside any operations that get_inner_reference can handle and see
4034 if what's inside is a constant: no need to do anything here for
4035 addresses of variables or functions. */
4036 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4037 tem
= TREE_OPERAND (tem
, 0))
4040 if (TREE_CODE (tem
) == MEM_REF
4041 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
4043 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
4047 if (!targetm
.binds_local_p (tem
))
4054 case POINTER_PLUS_EXPR
:
4055 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4056 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4060 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4061 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4062 /* The difference of two local labels is computable at link time. */
4063 if (reloc
== 1 && reloc2
== 1)
4070 case VIEW_CONVERT_EXPR
:
4071 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4076 unsigned HOST_WIDE_INT idx
;
4077 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4079 reloc
|= compute_reloc_for_constant (tem
);
4089 /* Find all the constants whose addresses are referenced inside of EXP,
4090 and make sure assembler code with a label has been output for each one.
4091 Indicate whether an ADDR_EXPR has been encountered. */
4094 output_addressed_constants (tree exp
)
4098 switch (TREE_CODE (exp
))
4102 /* Go inside any operations that get_inner_reference can handle and see
4103 if what's inside is a constant: no need to do anything here for
4104 addresses of variables or functions. */
4105 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4106 tem
= TREE_OPERAND (tem
, 0))
4109 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4110 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4111 tem
= DECL_INITIAL (tem
);
4113 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4114 output_constant_def (tem
, 0);
4116 if (TREE_CODE (tem
) == MEM_REF
)
4117 output_addressed_constants (TREE_OPERAND (tem
, 0));
4121 case POINTER_PLUS_EXPR
:
4123 output_addressed_constants (TREE_OPERAND (exp
, 1));
4127 case VIEW_CONVERT_EXPR
:
4128 output_addressed_constants (TREE_OPERAND (exp
, 0));
4133 unsigned HOST_WIDE_INT idx
;
4134 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4136 output_addressed_constants (tem
);
4145 /* Whether a constructor CTOR is a valid static constant initializer if all
4146 its elements are. This used to be internal to initializer_constant_valid_p
4147 and has been exposed to let other functions like categorize_ctor_elements
4148 evaluate the property while walking a constructor for other purposes. */
4151 constructor_static_from_elts_p (const_tree ctor
)
4153 return (TREE_CONSTANT (ctor
)
4154 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4155 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4156 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4159 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4162 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4163 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4164 which are valid when ENDTYPE is an integer of any size; in
4165 particular, this does not accept a pointer minus a constant. This
4166 returns null_pointer_node if the VALUE is an absolute constant
4167 which can be used to initialize a static variable. Otherwise it
4171 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4175 if (!INTEGRAL_TYPE_P (endtype
))
4178 op0
= TREE_OPERAND (value
, 0);
4179 op1
= TREE_OPERAND (value
, 1);
4181 /* Like STRIP_NOPS except allow the operand mode to widen. This
4182 works around a feature of fold that simplifies (int)(p1 - p2) to
4183 ((int)p1 - (int)p2) under the theory that the narrower operation
4186 while (CONVERT_EXPR_P (op0
)
4187 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4189 tree inner
= TREE_OPERAND (op0
, 0);
4190 if (inner
== error_mark_node
4191 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4192 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4193 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4198 while (CONVERT_EXPR_P (op1
)
4199 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4201 tree inner
= TREE_OPERAND (op1
, 0);
4202 if (inner
== error_mark_node
4203 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4204 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4205 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4210 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4214 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4215 cache
? cache
+ 2 : NULL
);
4216 /* Both initializers must be known. */
4220 && (op0
== null_pointer_node
4221 || TREE_CODE (value
) == MINUS_EXPR
))
4222 return null_pointer_node
;
4224 /* Support differences between labels. */
4225 if (TREE_CODE (op0
) == LABEL_DECL
4226 && TREE_CODE (op1
) == LABEL_DECL
)
4227 return null_pointer_node
;
4229 if (TREE_CODE (op0
) == STRING_CST
4230 && TREE_CODE (op1
) == STRING_CST
4231 && operand_equal_p (op0
, op1
, 1))
4232 return null_pointer_node
;
4238 /* Helper function of initializer_constant_valid_p.
4239 Return nonzero if VALUE is a valid constant-valued expression
4240 for use in initializing a static variable; one that can be an
4241 element of a "constant" initializer.
4243 Return null_pointer_node if the value is absolute;
4244 if it is relocatable, return the variable that determines the relocation.
4245 We assume that VALUE has been folded as much as possible;
4246 therefore, we do not need to check for such things as
4247 arithmetic-combinations of integers.
4249 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4252 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4256 switch (TREE_CODE (value
))
4259 if (constructor_static_from_elts_p (value
))
4261 unsigned HOST_WIDE_INT idx
;
4263 bool absolute
= true;
4265 if (cache
&& cache
[0] == value
)
4267 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4270 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4277 cache
[1] = NULL_TREE
;
4281 if (reloc
!= null_pointer_node
)
4284 /* For a non-absolute relocation, there is no single
4285 variable that can be "the variable that determines the
4290 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4292 return absolute
? null_pointer_node
: error_mark_node
;
4295 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4303 return null_pointer_node
;
4308 tree op0
= staticp (TREE_OPERAND (value
, 0));
4311 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4312 to be a constant, this is old-skool offsetof-like nonsense. */
4313 if (TREE_CODE (op0
) == INDIRECT_REF
4314 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4315 return null_pointer_node
;
4316 /* Taking the address of a nested function involves a trampoline,
4317 unless we don't need or want one. */
4318 if (TREE_CODE (op0
) == FUNCTION_DECL
4319 && DECL_STATIC_CHAIN (op0
)
4320 && !TREE_NO_TRAMPOLINE (value
))
4322 /* "&{...}" requires a temporary to hold the constructed
4324 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4330 case NON_LVALUE_EXPR
:
4331 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4334 case VIEW_CONVERT_EXPR
:
4336 tree src
= TREE_OPERAND (value
, 0);
4337 tree src_type
= TREE_TYPE (src
);
4338 tree dest_type
= TREE_TYPE (value
);
4340 /* Allow view-conversions from aggregate to non-aggregate type only
4341 if the bit pattern is fully preserved afterwards; otherwise, the
4342 RTL expander won't be able to apply a subsequent transformation
4343 to the underlying constructor. */
4344 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4346 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4347 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4352 /* Allow all other kinds of view-conversion. */
4353 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4358 tree src
= TREE_OPERAND (value
, 0);
4359 tree src_type
= TREE_TYPE (src
);
4360 tree dest_type
= TREE_TYPE (value
);
4362 /* Allow conversions between pointer types, floating-point
4363 types, and offset types. */
4364 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4365 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4366 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4367 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4368 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4370 /* Allow length-preserving conversions between integer types. */
4371 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4372 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4373 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4375 /* Allow conversions between other integer types only if
4377 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4379 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4380 if (inner
== null_pointer_node
)
4381 return null_pointer_node
;
4385 /* Allow (int) &foo provided int is as wide as a pointer. */
4386 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4387 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4388 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4390 /* Likewise conversions from int to pointers, but also allow
4391 conversions from 0. */
4392 if ((POINTER_TYPE_P (dest_type
)
4393 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4394 && INTEGRAL_TYPE_P (src_type
))
4396 if (TREE_CODE (src
) == INTEGER_CST
4397 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4398 return null_pointer_node
;
4399 if (integer_zerop (src
))
4400 return null_pointer_node
;
4401 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4402 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4405 /* Allow conversions to struct or union types if the value
4407 if (TREE_CODE (dest_type
) == RECORD_TYPE
4408 || TREE_CODE (dest_type
) == UNION_TYPE
)
4409 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4413 case POINTER_PLUS_EXPR
:
4415 /* Any valid floating-point constants will have been folded by now;
4416 with -frounding-math we hit this with addition of two constants. */
4417 if (TREE_CODE (endtype
) == REAL_TYPE
)
4419 if (cache
&& cache
[0] == value
)
4421 if (! INTEGRAL_TYPE_P (endtype
)
4422 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4424 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4426 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4429 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4430 endtype
, ncache
+ 2);
4431 /* If either term is absolute, use the other term's relocation. */
4432 if (valid0
== null_pointer_node
)
4434 else if (valid1
== null_pointer_node
)
4436 /* Support narrowing pointer differences. */
4438 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4442 /* Support narrowing pointer differences. */
4443 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4452 if (TREE_CODE (endtype
) == REAL_TYPE
)
4454 if (cache
&& cache
[0] == value
)
4456 if (! INTEGRAL_TYPE_P (endtype
)
4457 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4459 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4461 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4464 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4465 endtype
, ncache
+ 2);
4466 /* Win if second argument is absolute. */
4467 if (valid1
== null_pointer_node
)
4469 /* Win if both arguments have the same relocation.
4470 Then the value is absolute. */
4471 else if (valid0
== valid1
&& valid0
!= 0)
4472 ret
= null_pointer_node
;
4473 /* Since GCC guarantees that string constants are unique in the
4474 generated code, a subtraction between two copies of the same
4475 constant string is absolute. */
4476 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4477 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4478 && operand_equal_p (valid0
, valid1
, 1))
4479 ret
= null_pointer_node
;
4480 /* Support narrowing differences. */
4482 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4486 /* Support narrowing differences. */
4487 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4502 /* Return nonzero if VALUE is a valid constant-valued expression
4503 for use in initializing a static variable; one that can be an
4504 element of a "constant" initializer.
4506 Return null_pointer_node if the value is absolute;
4507 if it is relocatable, return the variable that determines the relocation.
4508 We assume that VALUE has been folded as much as possible;
4509 therefore, we do not need to check for such things as
4510 arithmetic-combinations of integers. */
4512 initializer_constant_valid_p (tree value
, tree endtype
)
4514 return initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4517 /* Return true if VALUE is a valid constant-valued expression
4518 for use in initializing a static bit-field; one that can be
4519 an element of a "constant" initializer. */
4522 initializer_constant_valid_for_bitfield_p (tree value
)
4524 /* For bitfields we support integer constants or possibly nested aggregates
4526 switch (TREE_CODE (value
))
4530 unsigned HOST_WIDE_INT idx
;
4533 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4534 if (!initializer_constant_valid_for_bitfield_p (elt
))
4543 case VIEW_CONVERT_EXPR
:
4544 case NON_LVALUE_EXPR
:
4546 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4555 /* output_constructor outer state of relevance in recursive calls, typically
4556 for nested aggregate bitfields. */
4559 unsigned int bit_offset
; /* current position in ... */
4560 int byte
; /* ... the outer byte buffer. */
4563 static unsigned HOST_WIDE_INT
4564 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int,
4567 /* Output assembler code for constant EXP, with no label.
4568 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4569 Assumes output_addressed_constants has been done on EXP already.
4571 Generate at least SIZE bytes of assembler data, padding at the end
4572 with zeros if necessary. SIZE must always be specified. The returned
4573 value is the actual number of bytes of assembler data generated, which
4574 may be bigger than SIZE if the object contains a variable length field.
4576 SIZE is important for structure constructors,
4577 since trailing members may have been omitted from the constructor.
4578 It is also important for initialization of arrays from string constants
4579 since the full length of the string constant might not be wanted.
4580 It is also needed for initialization of unions, where the initializer's
4581 type is just one member, and that may not be as long as the union.
4583 There a case in which we would fail to output exactly SIZE bytes:
4584 for a structure constructor that wants to produce more than SIZE bytes.
4585 But such constructors will never be generated for any possible input.
4587 ALIGN is the alignment of the data in bits. */
4589 static unsigned HOST_WIDE_INT
4590 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4592 enum tree_code code
;
4593 unsigned HOST_WIDE_INT thissize
;
4595 if (size
== 0 || flag_syntax_only
)
4598 /* See if we're trying to initialize a pointer in a non-default mode
4599 to the address of some declaration somewhere. If the target says
4600 the mode is valid for pointers, assume the target has a way of
4602 if (TREE_CODE (exp
) == NOP_EXPR
4603 && POINTER_TYPE_P (TREE_TYPE (exp
))
4604 && targetm
.addr_space
.valid_pointer_mode
4605 (TYPE_MODE (TREE_TYPE (exp
)),
4606 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4608 tree saved_type
= TREE_TYPE (exp
);
4610 /* Peel off any intermediate conversions-to-pointer for valid
4612 while (TREE_CODE (exp
) == NOP_EXPR
4613 && POINTER_TYPE_P (TREE_TYPE (exp
))
4614 && targetm
.addr_space
.valid_pointer_mode
4615 (TYPE_MODE (TREE_TYPE (exp
)),
4616 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4617 exp
= TREE_OPERAND (exp
, 0);
4619 /* If what we're left with is the address of something, we can
4620 convert the address to the final type and output it that
4622 if (TREE_CODE (exp
) == ADDR_EXPR
)
4623 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4624 /* Likewise for constant ints. */
4625 else if (TREE_CODE (exp
) == INTEGER_CST
)
4626 exp
= wide_int_to_tree (saved_type
, exp
);
4630 /* Eliminate any conversions since we'll be outputting the underlying
4632 while (CONVERT_EXPR_P (exp
)
4633 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4634 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4636 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4637 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4639 /* Make sure eliminating the conversion is really a no-op, except with
4640 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4641 union types to allow for Ada unchecked unions. */
4642 if (type_size
> op_size
4643 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4644 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4645 /* Keep the conversion. */
4648 exp
= TREE_OPERAND (exp
, 0);
4651 code
= TREE_CODE (TREE_TYPE (exp
));
4652 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4654 /* Allow a constructor with no elements for any data type.
4655 This means to fill the space with zeros. */
4656 if (TREE_CODE (exp
) == CONSTRUCTOR
4657 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4659 assemble_zeros (size
);
4663 if (TREE_CODE (exp
) == FDESC_EXPR
)
4665 #ifdef ASM_OUTPUT_FDESC
4666 HOST_WIDE_INT part
= tree_to_shwi (TREE_OPERAND (exp
, 1));
4667 tree decl
= TREE_OPERAND (exp
, 0);
4668 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4675 /* Now output the underlying data. If we've handling the padding, return.
4676 Otherwise, break and ensure SIZE is the size written. */
4683 case REFERENCE_TYPE
:
4685 case FIXED_POINT_TYPE
:
4687 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4688 EXPAND_INITIALIZER
),
4689 MIN (size
, thissize
), align
, 0))
4690 error ("initializer for integer/fixed-point value is too complicated");
4694 if (TREE_CODE (exp
) != REAL_CST
)
4695 error ("initializer for floating value is not a floating constant");
4697 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4701 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4702 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4703 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4708 switch (TREE_CODE (exp
))
4711 return output_constructor (exp
, size
, align
, NULL
);
4714 = MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
), size
);
4715 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4719 enum machine_mode inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4720 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4721 int elt_size
= GET_MODE_SIZE (inner
);
4722 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
);
4723 thissize
= elt_size
;
4724 for (unsigned int i
= 1; i
< VECTOR_CST_NELTS (exp
); i
++)
4726 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
);
4727 thissize
+= elt_size
;
4738 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4739 return output_constructor (exp
, size
, align
, NULL
);
4748 if (size
> thissize
)
4749 assemble_zeros (size
- thissize
);
4755 /* Subroutine of output_constructor, used for computing the size of
4756 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4757 type with an unspecified upper bound. */
4759 static unsigned HOST_WIDE_INT
4760 array_size_for_constructor (tree val
)
4763 unsigned HOST_WIDE_INT cnt
;
4764 tree index
, value
, tmp
;
4767 /* This code used to attempt to handle string constants that are not
4768 arrays of single-bytes, but nothing else does, so there's no point in
4770 if (TREE_CODE (val
) == STRING_CST
)
4771 return TREE_STRING_LENGTH (val
);
4773 max_index
= NULL_TREE
;
4774 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4776 if (TREE_CODE (index
) == RANGE_EXPR
)
4777 index
= TREE_OPERAND (index
, 1);
4778 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4782 if (max_index
== NULL_TREE
)
4785 /* Compute the total number of array elements. */
4786 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4787 i
= wi::to_offset (max_index
) - wi::to_offset (tmp
) + 1;
4789 /* Multiply by the array element unit size to find number of bytes. */
4790 i
*= wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4792 gcc_assert (wi::fits_uhwi_p (i
));
4793 return i
.to_uhwi ();
4796 /* Other datastructures + helpers for output_constructor. */
4798 /* output_constructor local state to support interaction with helpers. */
4802 /* Received arguments. */
4803 tree exp
; /* Constructor expression. */
4804 tree type
; /* Type of constructor expression. */
4805 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4806 unsigned int align
; /* Known initial alignment. */
4807 tree min_index
; /* Lower bound if specified for an array. */
4809 /* Output processing state. */
4810 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4811 int byte
; /* Part of a bitfield byte yet to be output. */
4812 int last_relative_index
; /* Implicit or explicit index of the last
4813 array element output within a bitfield. */
4814 bool byte_buffer_in_use
; /* Whether BYTE is in use. */
4816 /* Current element. */
4817 tree field
; /* Current field decl in a record. */
4818 tree val
; /* Current element value. */
4819 tree index
; /* Current element index. */
4823 /* Helper for output_constructor. From the current LOCAL state, output a
4824 RANGE_EXPR element. */
4827 output_constructor_array_range (oc_local_state
*local
)
4829 unsigned HOST_WIDE_INT fieldsize
4830 = int_size_in_bytes (TREE_TYPE (local
->type
));
4832 HOST_WIDE_INT lo_index
4833 = tree_to_shwi (TREE_OPERAND (local
->index
, 0));
4834 HOST_WIDE_INT hi_index
4835 = tree_to_shwi (TREE_OPERAND (local
->index
, 1));
4836 HOST_WIDE_INT index
;
4839 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4841 for (index
= lo_index
; index
<= hi_index
; index
++)
4843 /* Output the element's initial value. */
4844 if (local
->val
== NULL_TREE
)
4845 assemble_zeros (fieldsize
);
4847 fieldsize
= output_constant (local
->val
, fieldsize
, align2
);
4849 /* Count its size. */
4850 local
->total_bytes
+= fieldsize
;
4854 /* Helper for output_constructor. From the current LOCAL state, output a
4855 field element that is not true bitfield or part of an outer one. */
4858 output_constructor_regular_field (oc_local_state
*local
)
4860 /* Field size and position. Since this structure is static, we know the
4861 positions are constant. */
4862 unsigned HOST_WIDE_INT fieldsize
;
4863 HOST_WIDE_INT fieldpos
;
4865 unsigned int align2
;
4867 if (local
->index
!= NULL_TREE
)
4869 /* Perform the index calculation in modulo arithmetic but
4870 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4871 but we are using an unsigned sizetype. */
4872 unsigned prec
= TYPE_PRECISION (sizetype
);
4873 offset_int idx
= wi::sext (wi::to_offset (local
->index
)
4874 - wi::to_offset (local
->min_index
), prec
);
4875 fieldpos
= (idx
* wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
))))
4878 else if (local
->field
!= NULL_TREE
)
4879 fieldpos
= int_byte_position (local
->field
);
4883 /* Output any buffered-up bit-fields preceding this element. */
4884 if (local
->byte_buffer_in_use
)
4886 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4887 local
->total_bytes
++;
4888 local
->byte_buffer_in_use
= false;
4891 /* Advance to offset of this element.
4892 Note no alignment needed in an array, since that is guaranteed
4893 if each element has the proper size. */
4894 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4895 && fieldpos
> local
->total_bytes
)
4897 assemble_zeros (fieldpos
- local
->total_bytes
);
4898 local
->total_bytes
= fieldpos
;
4901 /* Find the alignment of this element. */
4902 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
4904 /* Determine size this element should occupy. */
4909 /* If this is an array with an unspecified upper bound,
4910 the initializer determines the size. */
4911 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4912 but we cannot do this until the deprecated support for
4913 initializing zero-length array members is removed. */
4914 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
4915 && TYPE_DOMAIN (TREE_TYPE (local
->field
))
4916 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
))))
4918 fieldsize
= array_size_for_constructor (local
->val
);
4919 /* Given a non-empty initialization, this field had
4921 gcc_assert (!fieldsize
|| !DECL_CHAIN (local
->field
));
4924 fieldsize
= tree_to_uhwi (DECL_SIZE_UNIT (local
->field
));
4927 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
4929 /* Output the element's initial value. */
4930 if (local
->val
== NULL_TREE
)
4931 assemble_zeros (fieldsize
);
4933 fieldsize
= output_constant (local
->val
, fieldsize
, align2
);
4935 /* Count its size. */
4936 local
->total_bytes
+= fieldsize
;
4939 /* Helper for output_constructor. From the LOCAL state, output an element
4940 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
4941 from the start of a possibly ongoing outer byte buffer. */
4944 output_constructor_bitfield (oc_local_state
*local
, unsigned int bit_offset
)
4946 /* Bit size of this element. */
4947 HOST_WIDE_INT ebitsize
4949 ? tree_to_uhwi (DECL_SIZE (local
->field
))
4950 : tree_to_uhwi (TYPE_SIZE (TREE_TYPE (local
->type
))));
4952 /* Relative index of this element if this is an array component. */
4953 HOST_WIDE_INT relative_index
4956 ? (tree_to_shwi (local
->index
)
4957 - tree_to_shwi (local
->min_index
))
4958 : local
->last_relative_index
+ 1)
4961 /* Bit position of this element from the start of the containing
4963 HOST_WIDE_INT constructor_relative_ebitpos
4965 ? int_bit_position (local
->field
)
4966 : ebitsize
* relative_index
);
4968 /* Bit position of this element from the start of a possibly ongoing
4969 outer byte buffer. */
4970 HOST_WIDE_INT byte_relative_ebitpos
4971 = bit_offset
+ constructor_relative_ebitpos
;
4973 /* From the start of a possibly ongoing outer byte buffer, offsets to
4974 the first bit of this element and to the first bit past the end of
4976 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
4977 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
4979 local
->last_relative_index
= relative_index
;
4981 if (local
->val
== NULL_TREE
)
4982 local
->val
= integer_zero_node
;
4984 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
4985 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
4986 local
->val
= TREE_OPERAND (local
->val
, 0);
4988 if (TREE_CODE (local
->val
) != INTEGER_CST
4989 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
4991 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
4995 /* If this field does not start in this (or next) byte, skip some bytes. */
4996 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4998 /* Output remnant of any bit field in previous bytes. */
4999 if (local
->byte_buffer_in_use
)
5001 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5002 local
->total_bytes
++;
5003 local
->byte_buffer_in_use
= false;
5006 /* If still not at proper byte, advance to there. */
5007 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5009 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
5010 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
5011 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
5015 /* Set up the buffer if necessary. */
5016 if (!local
->byte_buffer_in_use
)
5020 local
->byte_buffer_in_use
= true;
5023 /* If this is nested constructor, recurse passing the bit offset and the
5024 pending data, then retrieve the new pending data afterwards. */
5025 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
5027 oc_outer_state temp_state
;
5028 temp_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
5029 temp_state
.byte
= local
->byte
;
5031 += output_constructor (local
->val
, 0, 0, &temp_state
);
5032 local
->byte
= temp_state
.byte
;
5036 /* Otherwise, we must split the element into pieces that fall within
5037 separate bytes, and combine each byte with previous or following
5039 while (next_offset
< end_offset
)
5043 HOST_WIDE_INT value
;
5044 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
5045 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
5047 /* Advance from byte to byte within this element when necessary. */
5048 while (next_byte
!= local
->total_bytes
)
5050 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5051 local
->total_bytes
++;
5055 /* Number of bits we can process at once (all part of the same byte). */
5056 this_time
= MIN (end_offset
- next_offset
, BITS_PER_UNIT
- next_bit
);
5057 if (BYTES_BIG_ENDIAN
)
5059 /* On big-endian machine, take the most significant bits (of the
5060 bits that are significant) first and put them into bytes from
5061 the most significant end. */
5062 shift
= end_offset
- next_offset
- this_time
;
5064 /* Don't try to take a bunch of bits that cross
5065 the word boundary in the INTEGER_CST. We can
5066 only select bits from one element. */
5067 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5068 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5070 const int end
= shift
+ this_time
- 1;
5071 shift
= end
& -HOST_BITS_PER_WIDE_INT
;
5072 this_time
= end
- shift
+ 1;
5075 /* Now get the bits from the appropriate constant word. */
5076 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5077 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5079 /* Get the result. This works only when:
5080 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5081 local
->byte
|= (((value
>> shift
)
5082 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5083 << (BITS_PER_UNIT
- this_time
- next_bit
));
5087 /* On little-endian machines, take the least significant bits of
5088 the value first and pack them starting at the least significant
5089 bits of the bytes. */
5090 shift
= next_offset
- byte_relative_ebitpos
;
5092 /* Don't try to take a bunch of bits that cross
5093 the word boundary in the INTEGER_CST. We can
5094 only select bits from one element. */
5095 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5096 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5098 = HOST_BITS_PER_WIDE_INT
- (shift
& (HOST_BITS_PER_WIDE_INT
- 1));
5100 /* Now get the bits from the appropriate constant word. */
5101 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5102 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5104 /* Get the result. This works only when:
5105 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5106 local
->byte
|= (((value
>> shift
)
5107 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5111 next_offset
+= this_time
;
5112 local
->byte_buffer_in_use
= true;
5116 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5117 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5118 caller output state of relevance in recursive invocations. */
5120 static unsigned HOST_WIDE_INT
5121 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
5122 unsigned int align
, oc_outer_state
*outer
)
5124 unsigned HOST_WIDE_INT cnt
;
5125 constructor_elt
*ce
;
5127 oc_local_state local
;
5129 /* Setup our local state to communicate with helpers. */
5131 local
.type
= TREE_TYPE (exp
);
5133 local
.align
= align
;
5134 if (TREE_CODE (local
.type
) == ARRAY_TYPE
&& TYPE_DOMAIN (local
.type
))
5135 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5137 local
.min_index
= NULL_TREE
;
5139 local
.total_bytes
= 0;
5140 local
.byte_buffer_in_use
= outer
!= NULL
;
5141 local
.byte
= outer
? outer
->byte
: 0;
5142 local
.last_relative_index
= -1;
5144 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5146 /* As CE goes through the elements of the constant, FIELD goes through the
5147 structure fields if the constant is a structure. If the constant is a
5148 union, we override this by getting the field from the TREE_LIST element.
5149 But the constant could also be an array. Then FIELD is zero.
5151 There is always a maximum of one element in the chain LINK for unions
5152 (even if the initializer in a source program incorrectly contains
5155 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5156 local
.field
= TYPE_FIELDS (local
.type
);
5158 local
.field
= NULL_TREE
;
5161 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5162 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5164 local
.val
= ce
->value
;
5165 local
.index
= NULL_TREE
;
5167 /* The element in a union constructor specifies the proper field
5169 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5170 local
.field
= ce
->index
;
5172 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5173 local
.index
= ce
->index
;
5175 if (local
.field
&& flag_verbose_asm
)
5176 fprintf (asm_out_file
, "%s %s:\n",
5178 DECL_NAME (local
.field
)
5179 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5182 /* Eliminate the marker that makes a cast not be an lvalue. */
5183 if (local
.val
!= NULL_TREE
)
5184 STRIP_NOPS (local
.val
);
5186 /* Output the current element, using the appropriate helper ... */
5188 /* For an array slice not part of an outer bitfield. */
5190 && local
.index
!= NULL_TREE
5191 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5192 output_constructor_array_range (&local
);
5194 /* For a field that is neither a true bitfield nor part of an outer one,
5195 known to be at least byte aligned and multiple-of-bytes long. */
5197 && (local
.field
== NULL_TREE
5198 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5199 output_constructor_regular_field (&local
);
5201 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5202 supported for scalar fields, so we may need to convert first. */
5205 if (TREE_CODE (local
.val
) == REAL_CST
)
5207 = fold_unary (VIEW_CONVERT_EXPR
,
5208 build_nonstandard_integer_type
5209 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5211 output_constructor_bitfield (&local
, outer
? outer
->bit_offset
: 0);
5215 /* If we are not at toplevel, save the pending data for our caller.
5216 Otherwise output the pending data and padding zeros as needed. */
5218 outer
->byte
= local
.byte
;
5221 if (local
.byte_buffer_in_use
)
5223 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5224 local
.total_bytes
++;
5227 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5229 assemble_zeros (local
.size
- local
.total_bytes
);
5230 local
.total_bytes
= local
.size
;
5234 return local
.total_bytes
;
5237 /* Mark DECL as weak. */
5240 mark_weak (tree decl
)
5242 DECL_WEAK (decl
) = 1;
5244 if (DECL_RTL_SET_P (decl
)
5245 && MEM_P (DECL_RTL (decl
))
5246 && XEXP (DECL_RTL (decl
), 0)
5247 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5248 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5251 /* Merge weak status between NEWDECL and OLDDECL. */
5254 merge_weak (tree newdecl
, tree olddecl
)
5256 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5258 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5261 /* We put the NEWDECL on the weak_decls list at some point
5262 and OLDDECL as well. Keep just OLDDECL on the list. */
5263 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5264 if (TREE_VALUE (*pwd
) == newdecl
)
5266 *pwd
= TREE_CHAIN (*pwd
);
5273 if (DECL_WEAK (newdecl
))
5277 /* NEWDECL is weak, but OLDDECL is not. */
5279 /* If we already output the OLDDECL, we're in trouble; we can't
5280 go back and make it weak. This should never happen in
5281 unit-at-a-time compilation. */
5282 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5284 /* If we've already generated rtl referencing OLDDECL, we may
5285 have done so in a way that will not function properly with
5286 a weak symbol. Again in unit-at-a-time this should be
5288 gcc_assert (!TREE_USED (olddecl
)
5289 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5291 if (TARGET_SUPPORTS_WEAK
)
5293 /* We put the NEWDECL on the weak_decls list at some point.
5294 Replace it with the OLDDECL. */
5295 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5296 if (TREE_VALUE (wd
) == newdecl
)
5298 TREE_VALUE (wd
) = olddecl
;
5301 /* We may not find the entry on the list. If NEWDECL is a
5302 weak alias, then we will have already called
5303 globalize_decl to remove the entry; in that case, we do
5304 not need to do anything. */
5307 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5308 mark_weak (olddecl
);
5311 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5312 weak. Just update NEWDECL to indicate that it's weak too. */
5313 mark_weak (newdecl
);
5316 /* Declare DECL to be a weak symbol. */
5319 declare_weak (tree decl
)
5321 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5322 if (! TREE_PUBLIC (decl
))
5323 error ("weak declaration of %q+D must be public", decl
);
5324 else if (!TARGET_SUPPORTS_WEAK
)
5325 warning (0, "weak declaration of %q+D not supported", decl
);
5328 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5329 DECL_ATTRIBUTES (decl
)
5330 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5334 weak_finish_1 (tree decl
)
5336 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5337 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5340 if (! TREE_USED (decl
))
5343 #ifdef ASM_WEAKEN_DECL
5344 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5346 #ifdef ASM_WEAKEN_LABEL
5347 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5349 #ifdef ASM_OUTPUT_WEAK_ALIAS
5351 static bool warn_once
= 0;
5354 warning (0, "only weak aliases are supported in this configuration");
5364 /* Fiven an assembly name, find the decl it is associated with. */
5366 find_decl (tree target
)
5368 symtab_node
*node
= symtab_node::get_for_asmname (target
);
5374 /* This TREE_LIST contains weakref targets. */
5376 static GTY(()) tree weakref_targets
;
5378 /* Emit any pending weak declarations. */
5385 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5387 tree alias_decl
= TREE_PURPOSE (t
);
5388 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5390 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5391 /* Remove alias_decl from the weak list, but leave entries for
5392 the target alone. */
5394 #ifndef ASM_OUTPUT_WEAKREF
5395 else if (! TREE_SYMBOL_REFERENCED (target
))
5397 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5398 defined, otherwise we and weak_finish_1 would use
5399 different macros. */
5400 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5401 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5403 tree decl
= find_decl (target
);
5407 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5408 TREE_CODE (alias_decl
), target
,
5409 TREE_TYPE (alias_decl
));
5411 DECL_EXTERNAL (decl
) = 1;
5412 TREE_PUBLIC (decl
) = 1;
5413 DECL_ARTIFICIAL (decl
) = 1;
5414 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5415 TREE_USED (decl
) = 1;
5418 weak_finish_1 (decl
);
5427 /* Remove the alias and the target from the pending weak list
5428 so that we do not emit any .weak directives for the former,
5429 nor multiple .weak directives for the latter. */
5430 for (p
= &weak_decls
; (t2
= *p
) ; )
5432 if (TREE_VALUE (t2
) == alias_decl
5433 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5434 *p
= TREE_CHAIN (t2
);
5436 p
= &TREE_CHAIN (t2
);
5439 /* Remove other weakrefs to the same target, to speed things up. */
5440 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5442 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5443 *p
= TREE_CHAIN (t2
);
5445 p
= &TREE_CHAIN (t2
);
5450 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5452 tree decl
= TREE_VALUE (t
);
5454 weak_finish_1 (decl
);
5458 /* Emit the assembly bits to indicate that DECL is globally visible. */
5461 globalize_decl (tree decl
)
5464 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5465 if (DECL_WEAK (decl
))
5467 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5470 #ifdef ASM_WEAKEN_DECL
5471 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5473 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5476 /* Remove this function from the pending weak list so that
5477 we do not emit multiple .weak directives for it. */
5478 for (p
= &weak_decls
; (t
= *p
) ; )
5480 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5481 *p
= TREE_CHAIN (t
);
5483 p
= &TREE_CHAIN (t
);
5486 /* Remove weakrefs to the same target from the pending weakref
5487 list, for the same reason. */
5488 for (p
= &weakref_targets
; (t
= *p
) ; )
5490 if (DECL_ASSEMBLER_NAME (decl
)
5491 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5492 *p
= TREE_CHAIN (t
);
5494 p
= &TREE_CHAIN (t
);
5501 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5504 vec
<alias_pair
, va_gc
> *alias_pairs
;
5506 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5507 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5508 tree node is DECL to have the value of the tree node TARGET. */
5511 do_assemble_alias (tree decl
, tree target
)
5513 /* Emulated TLS had better not get this var. */
5514 gcc_assert (!(!targetm
.have_tls
5515 && TREE_CODE (decl
) == VAR_DECL
5516 && DECL_THREAD_LOCAL_P (decl
)));
5518 if (TREE_ASM_WRITTEN (decl
))
5521 /* We must force creation of DECL_RTL for debug info generation, even though
5522 we don't use it here. */
5523 make_decl_rtl (decl
);
5525 TREE_ASM_WRITTEN (decl
) = 1;
5526 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5528 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5530 ultimate_transparent_alias_target (&target
);
5532 if (!TREE_SYMBOL_REFERENCED (target
))
5533 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5535 #ifdef ASM_OUTPUT_WEAKREF
5536 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5537 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5538 IDENTIFIER_POINTER (target
));
5540 if (!TARGET_SUPPORTS_WEAK
)
5542 error_at (DECL_SOURCE_LOCATION (decl
),
5543 "weakref is not supported in this configuration");
5550 #ifdef ASM_OUTPUT_DEF
5551 /* Make name accessible from other files, if appropriate. */
5553 if (TREE_PUBLIC (decl
))
5555 globalize_decl (decl
);
5556 maybe_assemble_visibility (decl
);
5558 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5560 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5561 if (targetm
.has_ifunc_p ())
5562 ASM_OUTPUT_TYPE_DIRECTIVE
5563 (asm_out_file
, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5567 error_at (DECL_SOURCE_LOCATION (decl
),
5568 "ifunc is not supported on this target");
5571 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5572 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5574 ASM_OUTPUT_DEF (asm_out_file
,
5575 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5576 IDENTIFIER_POINTER (target
));
5578 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5583 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5584 # ifdef ASM_WEAKEN_DECL
5585 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5587 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5589 /* Remove this function from the pending weak list so that
5590 we do not emit multiple .weak directives for it. */
5591 for (p
= &weak_decls
; (t
= *p
) ; )
5592 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5593 *p
= TREE_CHAIN (t
);
5595 p
= &TREE_CHAIN (t
);
5597 /* Remove weakrefs to the same target from the pending weakref
5598 list, for the same reason. */
5599 for (p
= &weakref_targets
; (t
= *p
) ; )
5601 if (DECL_ASSEMBLER_NAME (decl
)
5602 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5603 *p
= TREE_CHAIN (t
);
5605 p
= &TREE_CHAIN (t
);
5611 /* Emit an assembler directive to make the symbol for DECL an alias to
5612 the symbol for TARGET. */
5615 assemble_alias (tree decl
, tree target
)
5619 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5621 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5623 ultimate_transparent_alias_target (&target
);
5625 if (alias
== target
)
5626 error ("weakref %q+D ultimately targets itself", decl
);
5627 if (TREE_PUBLIC (decl
))
5628 error ("weakref %q+D must have static linkage", decl
);
5632 #if !defined (ASM_OUTPUT_DEF)
5633 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5634 error_at (DECL_SOURCE_LOCATION (decl
),
5635 "alias definitions not supported in this configuration");
5636 TREE_ASM_WRITTEN (decl
) = 1;
5639 if (!DECL_WEAK (decl
))
5641 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5642 error_at (DECL_SOURCE_LOCATION (decl
),
5643 "ifunc is not supported in this configuration");
5645 error_at (DECL_SOURCE_LOCATION (decl
),
5646 "only weak aliases are supported in this configuration");
5647 TREE_ASM_WRITTEN (decl
) = 1;
5653 TREE_USED (decl
) = 1;
5655 /* Allow aliases to aliases. */
5656 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5657 cgraph_node::get_create (decl
)->alias
= true;
5659 varpool_node::get_create (decl
)->alias
= true;
5661 /* If the target has already been emitted, we don't have to queue the
5662 alias. This saves a tad of memory. */
5663 if (symtab
->global_info_ready
)
5664 target_decl
= find_decl (target
);
5667 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5668 || symtab
->state
>= EXPANSION
)
5669 do_assemble_alias (decl
, target
);
5672 alias_pair p
= {decl
, target
};
5673 vec_safe_push (alias_pairs
, p
);
5677 /* Record and output a table of translations from original function
5678 to its transaction aware clone. Note that tm_pure functions are
5679 considered to be their own clone. */
5681 static GTY((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
5682 htab_t tm_clone_hash
;
5685 record_tm_clone_pair (tree o
, tree n
)
5687 struct tree_map
**slot
, *h
;
5689 if (tm_clone_hash
== NULL
)
5690 tm_clone_hash
= htab_create_ggc (32, tree_map_hash
, tree_map_eq
, 0);
5692 h
= ggc_alloc
<tree_map
> ();
5693 h
->hash
= htab_hash_pointer (o
);
5697 slot
= (struct tree_map
**)
5698 htab_find_slot_with_hash (tm_clone_hash
, h
, h
->hash
, INSERT
);
5703 get_tm_clone_pair (tree o
)
5707 struct tree_map
*h
, in
;
5710 in
.hash
= htab_hash_pointer (o
);
5711 h
= (struct tree_map
*) htab_find_with_hash (tm_clone_hash
,
5719 typedef struct tm_alias_pair
5727 /* Helper function for finish_tm_clone_pairs. Dump a hash table entry
5728 into a VEC in INFO. */
5731 dump_tm_clone_to_vec (void **slot
, void *info
)
5733 struct tree_map
*map
= (struct tree_map
*) *slot
;
5734 vec
<tm_alias_pair
> *tm_alias_pairs
= (vec
<tm_alias_pair
> *) info
;
5735 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5736 tm_alias_pairs
->safe_push (p
);
5740 /* Dump the actual pairs to the .tm_clone_table section. */
5743 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5747 bool switched
= false;
5749 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5753 struct cgraph_node
*src_n
= cgraph_node::get (src
);
5754 struct cgraph_node
*dst_n
= cgraph_node::get (dst
);
5756 /* The function ipa_tm_create_version() marks the clone as needed if
5757 the original function was needed. But we also mark the clone as
5758 needed if we ever called the clone indirectly through
5759 TM_GETTMCLONE. If neither of these are true, we didn't generate
5760 a clone, and we didn't call it indirectly... no sense keeping it
5761 in the clone table. */
5762 if (!dst_n
|| !dst_n
->definition
)
5765 /* This covers the case where we have optimized the original
5766 function away, and only access the transactional clone. */
5767 if (!src_n
|| !src_n
->definition
)
5772 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5773 assemble_align (POINTER_SIZE
);
5777 assemble_integer (XEXP (DECL_RTL (src
), 0),
5778 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5779 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5780 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5784 /* Provide a default for the tm_clone_table section. */
5787 default_clone_table_section (void)
5789 return get_named_section (NULL
, ".tm_clone_table", 3);
5792 /* Helper comparison function for qsorting by the DECL_UID stored in
5793 alias_pair->emitted_diags. */
5796 tm_alias_pair_cmp (const void *x
, const void *y
)
5798 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5799 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5800 if (p1
->uid
< p2
->uid
)
5802 if (p1
->uid
> p2
->uid
)
5808 finish_tm_clone_pairs (void)
5810 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5812 if (tm_clone_hash
== NULL
)
5815 /* We need a determenistic order for the .tm_clone_table, otherwise
5816 we will get bootstrap comparison failures, so dump the hash table
5817 to a vector, sort it, and dump the vector. */
5819 /* Dump the hashtable to a vector. */
5820 htab_traverse_noresize (tm_clone_hash
, dump_tm_clone_to_vec
,
5821 (void *) &tm_alias_pairs
);
5823 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5826 dump_tm_clone_pairs (tm_alias_pairs
);
5828 htab_delete (tm_clone_hash
);
5829 tm_clone_hash
= NULL
;
5830 tm_alias_pairs
.release ();
5834 /* Emit an assembler directive to set symbol for DECL visibility to
5835 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5838 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5839 int vis ATTRIBUTE_UNUSED
)
5841 #ifdef HAVE_GAS_HIDDEN
5842 static const char * const visibility_types
[] = {
5843 NULL
, "protected", "hidden", "internal"
5846 const char *name
, *type
;
5848 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5849 type
= visibility_types
[vis
];
5851 fprintf (asm_out_file
, "\t.%s\t", type
);
5852 assemble_name (asm_out_file
, name
);
5853 fprintf (asm_out_file
, "\n");
5855 if (!DECL_ARTIFICIAL (decl
))
5856 warning (OPT_Wattributes
, "visibility attribute not supported "
5857 "in this configuration; ignored");
5861 /* A helper function to call assemble_visibility when needed for a decl. */
5864 maybe_assemble_visibility (tree decl
)
5866 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5868 if (vis
!= VISIBILITY_DEFAULT
)
5870 targetm
.asm_out
.assemble_visibility (decl
, vis
);
5877 /* Returns 1 if the target configuration supports defining public symbols
5878 so that one of them will be chosen at link time instead of generating a
5879 multiply-defined symbol error, whether through the use of weak symbols or
5880 a target-specific mechanism for having duplicates discarded. */
5883 supports_one_only (void)
5885 if (SUPPORTS_ONE_ONLY
)
5887 return TARGET_SUPPORTS_WEAK
;
5890 /* Set up DECL as a public symbol that can be defined in multiple
5891 translation units without generating a linker error. */
5894 make_decl_one_only (tree decl
, tree comdat_group
)
5896 struct symtab_node
*symbol
;
5897 gcc_assert (TREE_CODE (decl
) == VAR_DECL
5898 || TREE_CODE (decl
) == FUNCTION_DECL
);
5900 TREE_PUBLIC (decl
) = 1;
5902 if (TREE_CODE (decl
) == VAR_DECL
)
5903 symbol
= varpool_node::get_create (decl
);
5905 symbol
= cgraph_node::get_create (decl
);
5907 if (SUPPORTS_ONE_ONLY
)
5909 #ifdef MAKE_DECL_ONE_ONLY
5910 MAKE_DECL_ONE_ONLY (decl
);
5912 symbol
->set_comdat_group (comdat_group
);
5914 else if (TREE_CODE (decl
) == VAR_DECL
5915 && (DECL_INITIAL (decl
) == 0
5916 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
5917 DECL_COMMON (decl
) = 1;
5920 gcc_assert (TARGET_SUPPORTS_WEAK
);
5921 DECL_WEAK (decl
) = 1;
5926 init_varasm_once (void)
5928 section_htab
= htab_create_ggc (31, section_entry_hash
,
5929 section_entry_eq
, NULL
);
5930 object_block_htab
= htab_create_ggc (31, object_block_entry_hash
,
5931 object_block_entry_eq
, NULL
);
5932 const_desc_htab
= htab_create_ggc (1009, const_desc_hash
,
5933 const_desc_eq
, NULL
);
5935 const_alias_set
= new_alias_set ();
5936 shared_constant_pool
= create_constant_pool ();
5938 #ifdef TEXT_SECTION_ASM_OP
5939 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
5940 TEXT_SECTION_ASM_OP
);
5943 #ifdef DATA_SECTION_ASM_OP
5944 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5945 DATA_SECTION_ASM_OP
);
5948 #ifdef SDATA_SECTION_ASM_OP
5949 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5950 SDATA_SECTION_ASM_OP
);
5953 #ifdef READONLY_DATA_SECTION_ASM_OP
5954 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
5955 READONLY_DATA_SECTION_ASM_OP
);
5958 #ifdef CTORS_SECTION_ASM_OP
5959 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
5960 CTORS_SECTION_ASM_OP
);
5963 #ifdef DTORS_SECTION_ASM_OP
5964 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
5965 DTORS_SECTION_ASM_OP
);
5968 #ifdef BSS_SECTION_ASM_OP
5969 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5970 output_section_asm_op
,
5971 BSS_SECTION_ASM_OP
);
5974 #ifdef SBSS_SECTION_ASM_OP
5975 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5976 output_section_asm_op
,
5977 SBSS_SECTION_ASM_OP
);
5980 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5981 | SECTION_COMMON
, emit_tls_common
);
5982 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5983 | SECTION_COMMON
, emit_local
);
5984 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5985 | SECTION_COMMON
, emit_common
);
5987 #if defined ASM_OUTPUT_ALIGNED_BSS
5988 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
5992 targetm
.asm_out
.init_sections ();
5994 if (readonly_data_section
== NULL
)
5995 readonly_data_section
= text_section
;
5997 #ifdef ASM_OUTPUT_EXTERNAL
5998 pending_assemble_externals_set
= new hash_set
<tree
>;
6003 decl_default_tls_model (const_tree decl
)
6005 enum tls_model kind
;
6008 is_local
= targetm
.binds_local_p (decl
);
6012 kind
= TLS_MODEL_LOCAL_EXEC
;
6014 kind
= TLS_MODEL_INITIAL_EXEC
;
6017 /* Local dynamic is inefficient when we're not combining the
6018 parts of the address. */
6019 else if (optimize
&& is_local
)
6020 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
6022 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
6023 if (kind
< flag_tls_default
)
6024 kind
= flag_tls_default
;
6029 /* Select a set of attributes for section NAME based on the properties
6030 of DECL and whether or not RELOC indicates that DECL's initializer
6031 might contain runtime relocations.
6033 We make the section read-only and executable for a function decl,
6034 read-only for a const data decl, and writable for a non-const data decl. */
6037 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6041 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6042 flags
= SECTION_CODE
;
6045 enum section_category category
6046 = categorize_decl_for_section (decl
, reloc
);
6047 if (decl_readonly_section_1 (category
))
6049 else if (category
== SECCAT_DATA_REL_RO
6050 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6051 flags
= SECTION_WRITE
| SECTION_RELRO
;
6053 flags
= SECTION_WRITE
;
6057 flags
= SECTION_WRITE
;
6058 if (strcmp (name
, ".data.rel.ro") == 0
6059 || strcmp (name
, ".data.rel.ro.local") == 0)
6060 flags
|= SECTION_RELRO
;
6063 if (decl
&& DECL_P (decl
) && DECL_COMDAT_GROUP (decl
))
6064 flags
|= SECTION_LINKONCE
;
6066 if (strcmp (name
, ".vtable_map_vars") == 0)
6067 flags
|= SECTION_LINKONCE
;
6069 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6070 flags
|= SECTION_TLS
| SECTION_WRITE
;
6072 if (strcmp (name
, ".bss") == 0
6073 || strncmp (name
, ".bss.", 5) == 0
6074 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6075 || strcmp (name
, ".sbss") == 0
6076 || strncmp (name
, ".sbss.", 6) == 0
6077 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6078 flags
|= SECTION_BSS
;
6080 if (strcmp (name
, ".tdata") == 0
6081 || strncmp (name
, ".tdata.", 7) == 0
6082 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6083 flags
|= SECTION_TLS
;
6085 if (strcmp (name
, ".tbss") == 0
6086 || strncmp (name
, ".tbss.", 6) == 0
6087 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6088 flags
|= SECTION_TLS
| SECTION_BSS
;
6090 /* These three sections have special ELF types. They are neither
6091 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6092 want to print a section type (@progbits or @nobits). If someone
6093 is silly enough to emit code or TLS variables to one of these
6094 sections, then don't handle them specially. */
6095 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6096 && (strcmp (name
, ".init_array") == 0
6097 || strcmp (name
, ".fini_array") == 0
6098 || strcmp (name
, ".preinit_array") == 0))
6099 flags
|= SECTION_NOTYPE
;
6104 /* Return true if the target supports some form of global BSS,
6105 either through bss_noswitch_section, or by selecting a BSS
6106 section in TARGET_ASM_SELECT_SECTION. */
6109 have_global_bss_p (void)
6111 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6114 /* Output assembly to switch to section NAME with attribute FLAGS.
6115 Four variants for common object file formats. */
6118 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6119 unsigned int flags ATTRIBUTE_UNUSED
,
6120 tree decl ATTRIBUTE_UNUSED
)
6122 /* Some object formats don't support named sections at all. The
6123 front-end should already have flagged this as an error. */
6127 #ifndef TLS_SECTION_ASM_FLAG
6128 #define TLS_SECTION_ASM_FLAG 'T'
6132 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6133 tree decl ATTRIBUTE_UNUSED
)
6135 char flagchars
[10], *f
= flagchars
;
6137 /* If we have already declared this section, we can use an
6138 abbreviated form to switch back to it -- unless this section is
6139 part of a COMDAT groups, in which case GAS requires the full
6140 declaration every time. */
6141 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6142 && (flags
& SECTION_DECLARED
))
6144 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6148 if (!(flags
& SECTION_DEBUG
))
6150 if (flags
& SECTION_EXCLUDE
)
6152 if (flags
& SECTION_WRITE
)
6154 if (flags
& SECTION_CODE
)
6156 if (flags
& SECTION_SMALL
)
6158 if (flags
& SECTION_MERGE
)
6160 if (flags
& SECTION_STRINGS
)
6162 if (flags
& SECTION_TLS
)
6163 *f
++ = TLS_SECTION_ASM_FLAG
;
6164 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6168 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6170 if (!(flags
& SECTION_NOTYPE
))
6175 if (flags
& SECTION_BSS
)
6181 /* On platforms that use "@" as the assembly comment character,
6183 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6185 fprintf (asm_out_file
, format
, type
);
6187 if (flags
& SECTION_ENTSIZE
)
6188 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6189 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6191 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6192 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6194 fprintf (asm_out_file
, ",%s,comdat",
6195 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6199 putc ('\n', asm_out_file
);
6203 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6204 tree decl ATTRIBUTE_UNUSED
)
6206 char flagchars
[8], *f
= flagchars
;
6208 if (flags
& SECTION_WRITE
)
6210 if (flags
& SECTION_CODE
)
6214 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6218 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6221 default_coff_asm_named_section (name
, flags
, decl
);
6223 if (flags
& SECTION_LINKONCE
)
6225 /* Functions may have been compiled at various levels of
6226 optimization so we can't use `same_size' here.
6227 Instead, have the linker pick one. */
6228 fprintf (asm_out_file
, "\t.linkonce %s\n",
6229 (flags
& SECTION_CODE
? "discard" : "same_size"));
6233 /* The lame default section selector. */
6236 default_select_section (tree decl
, int reloc
,
6237 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6241 if (decl_readonly_section (decl
, reloc
))
6242 return readonly_data_section
;
6244 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6246 if (! ((flag_pic
&& reloc
)
6247 || !TREE_READONLY (decl
)
6248 || TREE_SIDE_EFFECTS (decl
)
6249 || !TREE_CONSTANT (decl
)))
6250 return readonly_data_section
;
6252 else if (TREE_CODE (decl
) == STRING_CST
)
6253 return readonly_data_section
;
6254 else if (! (flag_pic
&& reloc
))
6255 return readonly_data_section
;
6257 return data_section
;
6260 enum section_category
6261 categorize_decl_for_section (const_tree decl
, int reloc
)
6263 enum section_category ret
;
6265 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6267 else if (TREE_CODE (decl
) == STRING_CST
)
6269 if ((flag_sanitize
& SANITIZE_ADDRESS
)
6270 && asan_protect_global (CONST_CAST_TREE (decl
)))
6271 /* or !flag_merge_constants */
6272 return SECCAT_RODATA
;
6274 return SECCAT_RODATA_MERGE_STR
;
6276 else if (TREE_CODE (decl
) == VAR_DECL
)
6278 if (bss_initializer_p (decl
))
6280 else if (! TREE_READONLY (decl
)
6281 || TREE_SIDE_EFFECTS (decl
)
6282 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6284 /* Here the reloc_rw_mask is not testing whether the section should
6285 be read-only or not, but whether the dynamic link will have to
6286 do something. If so, we wish to segregate the data in order to
6287 minimize cache misses inside the dynamic linker. */
6288 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6289 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6293 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6294 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6295 else if (reloc
|| flag_merge_constants
< 2
6296 || ((flag_sanitize
& SANITIZE_ADDRESS
)
6297 && asan_protect_global (CONST_CAST_TREE (decl
))))
6298 /* C and C++ don't allow different variables to share the same
6299 location. -fmerge-all-constants allows even that (at the
6300 expense of not conforming). */
6301 ret
= SECCAT_RODATA
;
6302 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6303 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6305 ret
= SECCAT_RODATA_MERGE_CONST
;
6307 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6309 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6310 || TREE_SIDE_EFFECTS (decl
)
6311 || ! TREE_CONSTANT (decl
))
6314 ret
= SECCAT_RODATA
;
6317 ret
= SECCAT_RODATA
;
6319 /* There are no read-only thread-local sections. */
6320 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6322 /* Note that this would be *just* SECCAT_BSS, except that there's
6323 no concept of a read-only thread-local-data section. */
6324 if (ret
== SECCAT_BSS
6325 || (flag_zero_initialized_in_bss
6326 && initializer_zerop (DECL_INITIAL (decl
))))
6332 /* If the target uses small data sections, select it. */
6333 else if (targetm
.in_small_data_p (decl
))
6335 if (ret
== SECCAT_BSS
)
6337 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6338 ret
= SECCAT_SRODATA
;
6347 decl_readonly_section_1 (enum section_category category
)
6352 case SECCAT_RODATA_MERGE_STR
:
6353 case SECCAT_RODATA_MERGE_STR_INIT
:
6354 case SECCAT_RODATA_MERGE_CONST
:
6355 case SECCAT_SRODATA
:
6363 decl_readonly_section (const_tree decl
, int reloc
)
6365 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6368 /* Select a section based on the above categorization. */
6371 default_elf_select_section (tree decl
, int reloc
,
6372 unsigned HOST_WIDE_INT align
)
6375 switch (categorize_decl_for_section (decl
, reloc
))
6378 /* We're not supposed to be called on FUNCTION_DECLs. */
6381 return readonly_data_section
;
6382 case SECCAT_RODATA_MERGE_STR
:
6383 return mergeable_string_section (decl
, align
, 0);
6384 case SECCAT_RODATA_MERGE_STR_INIT
:
6385 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6386 case SECCAT_RODATA_MERGE_CONST
:
6387 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6388 case SECCAT_SRODATA
:
6392 return data_section
;
6393 case SECCAT_DATA_REL
:
6394 sname
= ".data.rel";
6396 case SECCAT_DATA_REL_LOCAL
:
6397 sname
= ".data.rel.local";
6399 case SECCAT_DATA_REL_RO
:
6400 sname
= ".data.rel.ro";
6402 case SECCAT_DATA_REL_RO_LOCAL
:
6403 sname
= ".data.rel.ro.local";
6426 return get_named_section (decl
, sname
, reloc
);
6429 /* Construct a unique section name based on the decl name and the
6430 categorization performed above. */
6433 default_unique_section (tree decl
, int reloc
)
6435 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6436 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6437 const char *prefix
, *name
, *linkonce
;
6440 switch (categorize_decl_for_section (decl
, reloc
))
6443 prefix
= one_only
? ".t" : ".text";
6446 case SECCAT_RODATA_MERGE_STR
:
6447 case SECCAT_RODATA_MERGE_STR_INIT
:
6448 case SECCAT_RODATA_MERGE_CONST
:
6449 prefix
= one_only
? ".r" : ".rodata";
6451 case SECCAT_SRODATA
:
6452 prefix
= one_only
? ".s2" : ".sdata2";
6455 prefix
= one_only
? ".d" : ".data";
6457 case SECCAT_DATA_REL
:
6458 prefix
= one_only
? ".d.rel" : ".data.rel";
6460 case SECCAT_DATA_REL_LOCAL
:
6461 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6463 case SECCAT_DATA_REL_RO
:
6464 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6466 case SECCAT_DATA_REL_RO_LOCAL
:
6467 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6470 prefix
= one_only
? ".s" : ".sdata";
6473 prefix
= one_only
? ".b" : ".bss";
6476 prefix
= one_only
? ".sb" : ".sbss";
6479 prefix
= one_only
? ".td" : ".tdata";
6482 prefix
= one_only
? ".tb" : ".tbss";
6488 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
6489 name
= targetm
.strip_name_encoding (name
);
6491 /* If we're using one_only, then there needs to be a .gnu.linkonce
6492 prefix to the section name. */
6493 linkonce
= one_only
? ".gnu.linkonce" : "";
6495 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6497 set_decl_section_name (decl
, string
);
6500 /* Like compute_reloc_for_constant, except for an RTX. The return value
6501 is a mask for which bit 1 indicates a global relocation, and bit 0
6502 indicates a local relocation. */
6505 compute_reloc_for_rtx_1 (rtx
*xp
, void *data
)
6507 int *preloc
= (int *) data
;
6510 switch (GET_CODE (x
))
6513 *preloc
|= SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6526 compute_reloc_for_rtx (rtx x
)
6530 switch (GET_CODE (x
))
6536 for_each_rtx (&x
, compute_reloc_for_rtx_1
, &reloc
);
6545 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
6547 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6549 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6550 return data_section
;
6552 return readonly_data_section
;
6556 default_elf_select_rtx_section (enum machine_mode mode
, rtx x
,
6557 unsigned HOST_WIDE_INT align
)
6559 int reloc
= compute_reloc_for_rtx (x
);
6561 /* ??? Handle small data here somehow. */
6563 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6566 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6568 return get_named_section (NULL
, ".data.rel.ro", 3);
6571 return mergeable_constant_section (mode
, align
, 0);
6574 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6577 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6582 /* Careful not to prod global register variables. */
6585 symbol
= XEXP (rtl
, 0);
6586 if (GET_CODE (symbol
) != SYMBOL_REF
)
6589 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6590 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6591 flags
|= SYMBOL_FLAG_FUNCTION
;
6592 if (targetm
.binds_local_p (decl
))
6593 flags
|= SYMBOL_FLAG_LOCAL
;
6594 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6595 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6596 else if (targetm
.in_small_data_p (decl
))
6597 flags
|= SYMBOL_FLAG_SMALL
;
6598 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6599 being PUBLIC, the thing *must* be defined in this translation unit.
6600 Prevent this buglet from being propagated into rtl code as well. */
6601 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6602 flags
|= SYMBOL_FLAG_EXTERNAL
;
6604 SYMBOL_REF_FLAGS (symbol
) = flags
;
6607 /* By default, we do nothing for encode_section_info, so we need not
6608 do anything but discard the '*' marker. */
6611 default_strip_name_encoding (const char *str
)
6613 return str
+ (*str
== '*');
6616 #ifdef ASM_OUTPUT_DEF
6617 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6618 anchor relative to ".", the current section position. */
6621 default_asm_output_anchor (rtx symbol
)
6625 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6626 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6627 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6631 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6634 default_use_anchors_for_symbol_p (const_rtx symbol
)
6639 /* Don't use anchors for mergeable sections. The linker might move
6640 the objects around. */
6641 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6642 if (sect
->common
.flags
& SECTION_MERGE
)
6645 /* Don't use anchors for small data sections. The small data register
6646 acts as an anchor for such sections. */
6647 if (sect
->common
.flags
& SECTION_SMALL
)
6650 decl
= SYMBOL_REF_DECL (symbol
);
6651 if (decl
&& DECL_P (decl
))
6653 /* Don't use section anchors for decls that might be defined or
6654 usurped by other modules. */
6655 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
6658 /* Don't use section anchors for decls that will be placed in a
6659 small data section. */
6660 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6661 one above. The problem is that we only use SECTION_SMALL for
6662 sections that should be marked as small in the section directive. */
6663 if (targetm
.in_small_data_p (decl
))
6669 /* Return true when RESOLUTION indicate that symbol will be bound to the
6670 definition provided by current .o file. */
6673 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6675 return (resolution
== LDPR_PREVAILING_DEF
6676 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6677 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6680 /* Return true when RESOLUTION indicate that symbol will be bound locally
6681 within current executable or DSO. */
6684 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6686 return (resolution
== LDPR_PREVAILING_DEF
6687 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6688 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6689 || resolution
== LDPR_PREEMPTED_REG
6690 || resolution
== LDPR_PREEMPTED_IR
6691 || resolution
== LDPR_RESOLVED_IR
6692 || resolution
== LDPR_RESOLVED_EXEC
);
6695 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6696 wrt cross-module name binding. */
6699 default_binds_local_p (const_tree exp
)
6701 return default_binds_local_p_1 (exp
, flag_shlib
);
6705 default_binds_local_p_1 (const_tree exp
, int shlib
)
6708 bool resolved_locally
= false;
6709 bool resolved_to_local_def
= false;
6711 /* With resolution file in hands, take look into resolutions.
6712 We can't just return true for resolved_locally symbols,
6713 because dynamic linking might overwrite symbols
6714 in shared libraries. */
6715 if (TREE_CODE (exp
) == VAR_DECL
&& TREE_PUBLIC (exp
)
6716 && (TREE_STATIC (exp
) || DECL_EXTERNAL (exp
)))
6718 varpool_node
*vnode
= varpool_node::get (exp
);
6719 if (vnode
&& (resolution_local_p (vnode
->resolution
) || vnode
->in_other_partition
))
6720 resolved_locally
= true;
6722 && resolution_to_local_definition_p (vnode
->resolution
))
6723 resolved_to_local_def
= true;
6725 else if (TREE_CODE (exp
) == FUNCTION_DECL
&& TREE_PUBLIC (exp
))
6727 struct cgraph_node
*node
= cgraph_node::get (exp
);
6729 && (resolution_local_p (node
->resolution
) || node
->in_other_partition
))
6730 resolved_locally
= true;
6732 && resolution_to_local_definition_p (node
->resolution
))
6733 resolved_to_local_def
= true;
6736 /* A non-decl is an entry in the constant pool. */
6739 /* Weakrefs may not bind locally, even though the weakref itself is always
6740 static and therefore local. Similarly, the resolver for ifunc functions
6741 might resolve to a non-local function.
6742 FIXME: We can resolve the weakref case more curefuly by looking at the
6744 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6745 || (TREE_CODE (exp
) == FUNCTION_DECL
6746 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6748 /* Static variables are always local. */
6749 else if (! TREE_PUBLIC (exp
))
6751 /* A variable is local if the user has said explicitly that it will
6753 else if ((DECL_VISIBILITY_SPECIFIED (exp
)
6754 || resolved_to_local_def
)
6755 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6757 /* Variables defined outside this object might not be local. */
6758 else if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6760 /* If defined in this object and visibility is not default, must be
6762 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6764 /* Default visibility weak data can be overridden by a strong symbol
6765 in another module and so are not local. */
6766 else if (DECL_WEAK (exp
)
6767 && !resolved_locally
)
6769 /* If PIC, then assume that any global name can be overridden by
6770 symbols resolved from other modules. */
6773 /* Uninitialized COMMON variable may be unified with symbols
6774 resolved from other modules. */
6775 else if (DECL_COMMON (exp
)
6776 && !resolved_locally
6777 && (DECL_INITIAL (exp
) == NULL
6778 || (!in_lto_p
&& DECL_INITIAL (exp
) == error_mark_node
)))
6780 /* Otherwise we're left with initialized (or non-common) global data
6781 which is of necessity defined locally. */
6788 /* Return true when references to DECL must bind to current definition in
6791 The condition is usually equivalent to whether the function binds to the
6792 current module (shared library or executable), that is to binds_local_p.
6793 We use this fact to avoid need for another target hook and implement
6794 the logic using binds_local_p and just special cases where
6795 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6796 the weak definitions (that can be overwritten at linktime by other
6797 definition from different object file) and when resolution info is available
6798 we simply use the knowledge passed to us by linker plugin. */
6800 decl_binds_to_current_def_p (const_tree decl
)
6802 gcc_assert (DECL_P (decl
));
6803 if (!targetm
.binds_local_p (decl
))
6805 if (!TREE_PUBLIC (decl
))
6807 /* When resolution is available, just use it. */
6808 if (TREE_CODE (decl
) == VAR_DECL
6809 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)))
6811 varpool_node
*vnode
= varpool_node::get (decl
);
6813 && vnode
->resolution
!= LDPR_UNKNOWN
)
6814 return resolution_to_local_definition_p (vnode
->resolution
);
6816 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
6818 struct cgraph_node
*node
= cgraph_node::get (decl
);
6820 && node
->resolution
!= LDPR_UNKNOWN
)
6821 return resolution_to_local_definition_p (node
->resolution
);
6823 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6824 binds locally but still can be overwritten), DECL_COMMON (can be merged
6825 with a non-common definition somewhere in the same module) or
6827 This rely on fact that binds_local_p behave as decl_replaceable_p
6828 for all other declaration types. */
6829 if (DECL_WEAK (decl
))
6831 if (DECL_COMMON (decl
)
6832 && (DECL_INITIAL (decl
) == NULL
6833 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6835 if (DECL_EXTERNAL (decl
))
6840 /* A replaceable function or variable is one which may be replaced
6841 at link-time with an entirely different definition, provided that the
6842 replacement has the same type. For example, functions declared
6843 with __attribute__((weak)) on most systems are replaceable.
6845 COMDAT functions are not replaceable, since all definitions of the
6846 function must be equivalent. It is important that COMDAT functions
6847 not be treated as replaceable so that use of C++ template
6848 instantiations is not penalized. */
6851 decl_replaceable_p (tree decl
)
6853 gcc_assert (DECL_P (decl
));
6854 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
6856 if (!flag_semantic_interposition
6857 && !DECL_WEAK (decl
))
6859 return !decl_binds_to_current_def_p (decl
);
6862 /* Default function to output code that will globalize a label. A
6863 target must define GLOBAL_ASM_OP or provide its own function to
6864 globalize a label. */
6865 #ifdef GLOBAL_ASM_OP
6867 default_globalize_label (FILE * stream
, const char *name
)
6869 fputs (GLOBAL_ASM_OP
, stream
);
6870 assemble_name (stream
, name
);
6871 putc ('\n', stream
);
6873 #endif /* GLOBAL_ASM_OP */
6875 /* Default function to output code that will globalize a declaration. */
6877 default_globalize_decl_name (FILE * stream
, tree decl
)
6879 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6880 targetm
.asm_out
.globalize_label (stream
, name
);
6883 /* Default function to output a label for unwind information. The
6884 default is to do nothing. A target that needs nonlocal labels for
6885 unwind information must provide its own function to do this. */
6887 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6888 tree decl ATTRIBUTE_UNUSED
,
6889 int for_eh ATTRIBUTE_UNUSED
,
6890 int empty ATTRIBUTE_UNUSED
)
6894 /* Default function to output a label to divide up the exception table.
6895 The default is to do nothing. A target that needs/wants to divide
6896 up the table must provide it's own function to do this. */
6898 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
6902 /* This is how to output an internal numbered label where PREFIX is
6903 the class of label and LABELNO is the number within the class. */
6906 default_generate_internal_label (char *buf
, const char *prefix
,
6907 unsigned long labelno
)
6909 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6912 /* This is how to output an internal numbered label where PREFIX is
6913 the class of label and LABELNO is the number within the class. */
6916 default_internal_label (FILE *stream
, const char *prefix
,
6917 unsigned long labelno
)
6919 char *const buf
= (char *) alloca (40 + strlen (prefix
));
6920 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6921 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
6925 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
6928 default_asm_declare_constant_name (FILE *file
, const char *name
,
6929 const_tree exp ATTRIBUTE_UNUSED
,
6930 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
6932 assemble_label (file
, name
);
6935 /* This is the default behavior at the beginning of a file. It's
6936 controlled by two other target-hook toggles. */
6938 default_file_start (void)
6940 if (targetm
.asm_file_start_app_off
6941 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
6942 fputs (ASM_APP_OFF
, asm_out_file
);
6944 if (targetm
.asm_file_start_file_directive
)
6945 output_file_directive (asm_out_file
, main_input_filename
);
6948 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6949 which emits a special section directive used to indicate whether or
6950 not this object file needs an executable stack. This is primarily
6951 a GNU extension to ELF but could be used on other targets. */
6953 int trampolines_created
;
6956 file_end_indicate_exec_stack (void)
6958 unsigned int flags
= SECTION_DEBUG
;
6959 if (trampolines_created
)
6960 flags
|= SECTION_CODE
;
6962 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
6965 /* Emit a special section directive to indicate that this object file
6966 was compiled with -fsplit-stack. This is used to let the linker
6967 detect calls between split-stack code and non-split-stack code, so
6968 that it can modify the split-stack code to allocate a sufficiently
6969 large stack. We emit another special section if there are any
6970 functions in this file which have the no_split_stack attribute, to
6971 prevent the linker from warning about being unable to convert the
6972 functions if they call non-split-stack code. */
6975 file_end_indicate_split_stack (void)
6977 if (flag_split_stack
)
6979 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
6981 if (saw_no_split_stack
)
6982 switch_to_section (get_section (".note.GNU-no-split-stack",
6983 SECTION_DEBUG
, NULL
));
6987 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6988 a get_unnamed_section callback. */
6991 output_section_asm_op (const void *directive
)
6993 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
6996 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6997 the current section is NEW_SECTION. */
7000 switch_to_section (section
*new_section
)
7002 if (in_section
== new_section
)
7005 if (new_section
->common
.flags
& SECTION_FORGET
)
7008 in_section
= new_section
;
7010 switch (SECTION_STYLE (new_section
))
7013 targetm
.asm_out
.named_section (new_section
->named
.name
,
7014 new_section
->named
.common
.flags
,
7015 new_section
->named
.decl
);
7018 case SECTION_UNNAMED
:
7019 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
7022 case SECTION_NOSWITCH
:
7027 new_section
->common
.flags
|= SECTION_DECLARED
;
7030 /* If block symbol SYMBOL has not yet been assigned an offset, place
7031 it at the end of its block. */
7034 place_block_symbol (rtx symbol
)
7036 unsigned HOST_WIDE_INT size
, mask
, offset
;
7037 struct constant_descriptor_rtx
*desc
;
7038 unsigned int alignment
;
7039 struct object_block
*block
;
7042 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7043 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7046 /* Work out the symbol's size and alignment. */
7047 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7049 desc
= SYMBOL_REF_CONSTANT (symbol
);
7050 alignment
= desc
->align
;
7051 size
= GET_MODE_SIZE (desc
->mode
);
7053 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7055 decl
= SYMBOL_REF_DECL (symbol
);
7056 alignment
= DECL_ALIGN (decl
);
7057 size
= get_constant_size (DECL_INITIAL (decl
));
7058 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7059 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7060 && asan_protect_global (DECL_INITIAL (decl
)))
7061 size
+= asan_red_zone_size (size
);
7065 struct symtab_node
*snode
;
7066 decl
= SYMBOL_REF_DECL (symbol
);
7068 snode
= symtab_node::get (decl
);
7071 rtx target
= DECL_RTL (snode
->ultimate_alias_target ()->decl
);
7073 place_block_symbol (target
);
7074 SYMBOL_REF_BLOCK_OFFSET (symbol
) = SYMBOL_REF_BLOCK_OFFSET (target
);
7077 alignment
= get_variable_align (decl
);
7078 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7079 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7080 && asan_protect_global (decl
))
7082 size
+= asan_red_zone_size (size
);
7083 alignment
= MAX (alignment
,
7084 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7088 /* Calculate the object's offset from the start of the block. */
7089 block
= SYMBOL_REF_BLOCK (symbol
);
7090 mask
= alignment
/ BITS_PER_UNIT
- 1;
7091 offset
= (block
->size
+ mask
) & ~mask
;
7092 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7094 /* Record the block's new alignment and size. */
7095 block
->alignment
= MAX (block
->alignment
, alignment
);
7096 block
->size
= offset
+ size
;
7098 vec_safe_push (block
->objects
, symbol
);
7101 /* Return the anchor that should be used to address byte offset OFFSET
7102 from the first object in BLOCK. MODEL is the TLS model used
7106 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7107 enum tls_model model
)
7110 unsigned int begin
, middle
, end
;
7111 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7114 /* Work out the anchor's offset. Use an offset of 0 for the first
7115 anchor so that we don't pessimize the case where we take the address
7116 of a variable at the beginning of the block. This is particularly
7117 useful when a block has only one variable assigned to it.
7119 We try to place anchors RANGE bytes apart, so there can then be
7120 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7121 a ptr_mode offset. With some target settings, the lowest such
7122 anchor might be out of range for the lowest ptr_mode offset;
7123 likewise the highest anchor for the highest offset. Use anchors
7124 at the extreme ends of the ptr_mode range in such cases.
7126 All arithmetic uses unsigned integers in order to avoid
7128 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7129 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7130 range
= max_offset
- min_offset
+ 1;
7135 bias
= 1 << (GET_MODE_BITSIZE (ptr_mode
) - 1);
7138 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7139 delta
-= delta
% range
;
7142 offset
= (HOST_WIDE_INT
) (-delta
);
7146 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7147 delta
-= delta
% range
;
7148 if (delta
> bias
- 1)
7150 offset
= (HOST_WIDE_INT
) delta
;
7154 /* Do a binary search to see if there's already an anchor we can use.
7155 Set BEGIN to the new anchor's index if not. */
7157 end
= vec_safe_length (block
->anchors
);
7158 while (begin
!= end
)
7160 middle
= (end
+ begin
) / 2;
7161 anchor
= (*block
->anchors
)[middle
];
7162 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7164 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7166 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7168 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7174 /* Create a new anchor with a unique label. */
7175 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7176 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7177 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7178 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7180 /* Insert it at index BEGIN. */
7181 vec_safe_insert (block
->anchors
, begin
, anchor
);
7185 /* Output the objects in BLOCK. */
7188 output_object_block (struct object_block
*block
)
7190 struct constant_descriptor_rtx
*desc
;
7192 HOST_WIDE_INT offset
;
7196 if (!block
->objects
)
7199 /* Switch to the section and make sure that the first byte is
7200 suitably aligned. */
7201 switch_to_section (block
->sect
);
7202 assemble_align (block
->alignment
);
7204 /* Define the values of all anchors relative to the current section
7206 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7207 targetm
.asm_out
.output_anchor (symbol
);
7209 /* Output the objects themselves. */
7211 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7213 /* Move to the object's offset, padding with zeros if necessary. */
7214 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7215 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7216 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7218 desc
= SYMBOL_REF_CONSTANT (symbol
);
7219 output_constant_pool_1 (desc
, 1);
7220 offset
+= GET_MODE_SIZE (desc
->mode
);
7222 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7225 decl
= SYMBOL_REF_DECL (symbol
);
7226 assemble_constant_contents (DECL_INITIAL (decl
), XSTR (symbol
, 0),
7228 size
= get_constant_size (DECL_INITIAL (decl
));
7230 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7231 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7232 && asan_protect_global (DECL_INITIAL (decl
)))
7234 size
= asan_red_zone_size (size
);
7235 assemble_zeros (size
);
7242 decl
= SYMBOL_REF_DECL (symbol
);
7243 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7244 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7246 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7247 && asan_protect_global (decl
))
7249 size
= asan_red_zone_size (size
);
7250 assemble_zeros (size
);
7257 /* A htab_traverse callback used to call output_object_block for
7258 each member of object_block_htab. */
7261 output_object_block_htab (void **slot
, void *data ATTRIBUTE_UNUSED
)
7263 output_object_block ((struct object_block
*) (*slot
));
7267 /* Output the definitions of all object_blocks. */
7270 output_object_blocks (void)
7272 htab_traverse (object_block_htab
, output_object_block_htab
, NULL
);
7275 /* This function provides a possible implementation of the
7276 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7277 by -frecord-gcc-switches it creates a new mergeable, string section in the
7278 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7279 contains the switches in ASCII format.
7281 FIXME: This code does not correctly handle double quote characters
7282 that appear inside strings, (it strips them rather than preserving them).
7283 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7284 characters - instead it treats them as sub-string separators. Since
7285 we want to emit NUL strings terminators into the object file we have to use
7289 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7293 case SWITCH_TYPE_PASSED
:
7294 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7295 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7298 case SWITCH_TYPE_DESCRIPTIVE
:
7301 /* Distinguish between invocations where name is NULL. */
7302 static bool started
= false;
7308 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7312 | (SECTION_ENTSIZE
& 1),
7314 switch_to_section (sec
);
7323 /* The return value is currently ignored by the caller, but must be 0.
7324 For -fverbose-asm the return value would be the number of characters
7325 emitted into the assembler file. */
7329 /* Emit text to declare externally defined symbols. It is needed to
7330 properly support non-default visibility. */
7332 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7334 const char *name ATTRIBUTE_UNUSED
)
7336 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7337 set in order to avoid putting out names that are never really
7339 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7340 && targetm
.binds_local_p (decl
))
7341 maybe_assemble_visibility (decl
);
7344 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7347 default_asm_output_source_filename (FILE *file
, const char *name
)
7349 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7350 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7352 fprintf (file
, "\t.file\t");
7353 output_quoted_string (file
, name
);
7358 /* Output a file name in the form wanted by System V. */
7361 output_file_directive (FILE *asm_file
, const char *input_name
)
7366 if (input_name
== NULL
)
7367 input_name
= "<stdin>";
7369 input_name
= remap_debug_filename (input_name
);
7371 len
= strlen (input_name
);
7372 na
= input_name
+ len
;
7374 /* NA gets INPUT_NAME sans directory names. */
7375 while (na
> input_name
)
7377 if (IS_DIR_SEPARATOR (na
[-1]))
7382 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7385 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7388 make_debug_expr_from_rtl (const_rtx exp
)
7390 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7391 enum machine_mode mode
= GET_MODE (exp
);
7394 DECL_ARTIFICIAL (ddecl
) = 1;
7395 if (REG_P (exp
) && REG_EXPR (exp
))
7396 type
= TREE_TYPE (REG_EXPR (exp
));
7397 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7398 type
= TREE_TYPE (MEM_EXPR (exp
));
7401 if (type
&& TYPE_MODE (type
) == mode
)
7402 TREE_TYPE (ddecl
) = type
;
7404 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7405 DECL_MODE (ddecl
) = mode
;
7406 dval
= gen_rtx_DEBUG_EXPR (mode
);
7407 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7408 SET_DECL_RTL (ddecl
, dval
);
7412 #ifdef ELF_ASCII_ESCAPES
7413 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7416 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7421 fputs (STRING_ASM_OP
, f
);
7426 escape
= ELF_ASCII_ESCAPES
[c
];
7433 /* TODO: Print in hex with fast function, important for -flto. */
7434 fprintf (f
, "\\%03o", c
);
7447 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7450 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7452 const char *limit
= s
+ len
;
7453 const char *last_null
= NULL
;
7454 unsigned bytes_in_chunk
= 0;
7458 for (; s
< limit
; s
++)
7462 if (bytes_in_chunk
>= 60)
7471 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7478 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7480 if (bytes_in_chunk
> 0)
7487 default_elf_asm_output_limited_string (f
, s
);
7492 if (bytes_in_chunk
== 0)
7493 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7496 escape
= ELF_ASCII_ESCAPES
[c
];
7504 /* TODO: Print in hex with fast function, important for -flto. */
7505 fprintf (f
, "\\%03o", c
);
7506 bytes_in_chunk
+= 4;
7511 bytes_in_chunk
+= 2;
7518 if (bytes_in_chunk
> 0)
7526 static GTY(()) section
*elf_init_array_section
;
7527 static GTY(()) section
*elf_fini_array_section
;
7530 get_elf_initfini_array_priority_section (int priority
,
7534 if (priority
!= DEFAULT_INIT_PRIORITY
)
7537 sprintf (buf
, "%s.%.5u",
7538 constructor_p
? ".init_array" : ".fini_array",
7540 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7546 if (elf_init_array_section
== NULL
)
7547 elf_init_array_section
7548 = get_section (".init_array",
7549 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7550 sec
= elf_init_array_section
;
7554 if (elf_fini_array_section
== NULL
)
7555 elf_fini_array_section
7556 = get_section (".fini_array",
7557 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7558 sec
= elf_fini_array_section
;
7564 /* Use .init_array section for constructors. */
7567 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7569 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7571 assemble_addr_to_section (symbol
, sec
);
7574 /* Use .fini_array section for destructors. */
7577 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7579 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7581 assemble_addr_to_section (symbol
, sec
);
7584 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7586 This is a bit of a cheat. The real default is a no-op, but this
7587 hook is the default for all targets with a .ident directive. */
7590 default_asm_output_ident_directive (const char *ident_str
)
7592 const char *ident_asm_op
= "\t.ident\t";
7594 /* If we are still in the front end, do not write out the string
7595 to asm_out_file. Instead, add a fake top-level asm statement.
7596 This allows the front ends to use this hook without actually
7597 writing to asm_out_file, to handle #ident or Pragma Ident. */
7598 if (symtab
->state
== PARSING
)
7600 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7601 symtab
->finalize_toplevel_asm (build_string (strlen (buf
), buf
));
7604 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7607 #include "gt-varasm.h"