1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987-2013 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
21 /* This file handles generation of all the assembler code
22 *except* the instructions of a function.
23 This includes declarations of variables and their initial values.
25 We also output the assembler code for constants stored in memory
26 and are responsible for combining constants with the same value. */
30 #include "coretypes.h"
34 #include "stor-layout.h"
35 #include "stringpool.h"
36 #include "gcc-symtab.h"
41 #include "hard-reg-set.h"
44 #include "diagnostic-core.h"
47 #include "langhooks.h"
51 #include "common/common-target.h"
52 #include "targhooks.h"
54 #include "pointer-set.h"
56 #include "basic-block.h"
58 #ifdef XCOFF_DEBUGGING_INFO
59 #include "xcoffout.h" /* Needed for external data
60 declarations for e.g. AIX 4.x. */
63 /* The (assembler) name of the first globally-visible object output. */
64 extern GTY(()) const char *first_global_object_name
;
65 extern GTY(()) const char *weak_global_object_name
;
67 const char *first_global_object_name
;
68 const char *weak_global_object_name
;
71 struct constant_descriptor_rtx
;
72 struct rtx_constant_pool
;
74 #define n_deferred_constants (crtl->varasm.deferred_constants)
76 /* Number for making the label on the next
77 constant that is stored in memory. */
79 static GTY(()) int const_labelno
;
81 /* Carry information from ASM_DECLARE_OBJECT_NAME
82 to ASM_FINISH_DECLARE_OBJECT. */
84 int size_directive_output
;
86 /* The last decl for which assemble_variable was called,
87 if it did ASM_DECLARE_OBJECT_NAME.
88 If the last call to assemble_variable didn't do that,
91 tree last_assemble_variable_decl
;
93 /* The following global variable indicates if the first basic block
94 in a function belongs to the cold partition or not. */
96 bool first_function_block_is_cold
;
98 /* We give all constants their own alias set. Perhaps redundant with
99 MEM_READONLY_P, but pre-dates it. */
101 static alias_set_type const_alias_set
;
103 /* Whether we saw any functions with no_split_stack. */
105 static bool saw_no_split_stack
;
107 static const char *strip_reg_name (const char *);
108 static int contains_pointers_p (tree
);
109 #ifdef ASM_OUTPUT_EXTERNAL
110 static bool incorporeal_function_p (tree
);
112 static void decode_addr_const (tree
, struct addr_const
*);
113 static hashval_t
const_desc_hash (const void *);
114 static int const_desc_eq (const void *, const void *);
115 static hashval_t
const_hash_1 (const tree
);
116 static int compare_constant (const tree
, const tree
);
117 static tree
copy_constant (tree
);
118 static void output_constant_def_contents (rtx
);
119 static void output_addressed_constants (tree
);
120 static unsigned HOST_WIDE_INT
array_size_for_constructor (tree
);
121 static unsigned min_align (unsigned, unsigned);
122 static void globalize_decl (tree
);
123 static bool decl_readonly_section_1 (enum section_category
);
124 #ifdef BSS_SECTION_ASM_OP
125 #ifdef ASM_OUTPUT_ALIGNED_BSS
126 static void asm_output_aligned_bss (FILE *, tree
, const char *,
127 unsigned HOST_WIDE_INT
, int)
130 #endif /* BSS_SECTION_ASM_OP */
131 static void mark_weak (tree
);
132 static void output_constant_pool (const char *, tree
);
134 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
135 section
*text_section
;
136 section
*data_section
;
137 section
*readonly_data_section
;
138 section
*sdata_section
;
139 section
*ctors_section
;
140 section
*dtors_section
;
141 section
*bss_section
;
142 section
*sbss_section
;
144 /* Various forms of common section. All are guaranteed to be nonnull. */
145 section
*tls_comm_section
;
146 section
*comm_section
;
147 section
*lcomm_section
;
149 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
151 section
*bss_noswitch_section
;
153 /* The section that holds the main exception table, when known. The section
154 is set either by the target's init_sections hook or by the first call to
155 switch_to_exception_section. */
156 section
*exception_section
;
158 /* The section that holds the DWARF2 frame unwind information, when known.
159 The section is set either by the target's init_sections hook or by the
160 first call to switch_to_eh_frame_section. */
161 section
*eh_frame_section
;
163 /* asm_out_file's current section. This is NULL if no section has yet
164 been selected or if we lose track of what the current section is. */
167 /* True if code for the current function is currently being directed
168 at the cold section. */
169 bool in_cold_section_p
;
171 /* A linked list of all the unnamed sections. */
172 static GTY(()) section
*unnamed_sections
;
174 /* Return a nonzero value if DECL has a section attribute. */
175 #define IN_NAMED_SECTION(DECL) \
176 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
177 && DECL_SECTION_NAME (DECL) != NULL_TREE)
179 /* Hash table of named sections. */
180 static GTY((param_is (section
))) htab_t section_htab
;
182 /* A table of object_blocks, indexed by section. */
183 static GTY((param_is (struct object_block
))) htab_t object_block_htab
;
185 /* The next number to use for internal anchor labels. */
186 static GTY(()) int anchor_labelno
;
188 /* A pool of constants that can be shared between functions. */
189 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
191 /* Helper routines for maintaining section_htab. */
194 section_entry_eq (const void *p1
, const void *p2
)
196 const section
*old
= (const section
*) p1
;
197 const char *new_name
= (const char *) p2
;
199 return strcmp (old
->named
.name
, new_name
) == 0;
203 section_entry_hash (const void *p
)
205 const section
*old
= (const section
*) p
;
206 return htab_hash_string (old
->named
.name
);
209 /* Return a hash value for section SECT. */
212 hash_section (section
*sect
)
214 if (sect
->common
.flags
& SECTION_NAMED
)
215 return htab_hash_string (sect
->named
.name
);
216 return sect
->common
.flags
;
219 /* Helper routines for maintaining object_block_htab. */
222 object_block_entry_eq (const void *p1
, const void *p2
)
224 const struct object_block
*old
= (const struct object_block
*) p1
;
225 const section
*new_section
= (const section
*) p2
;
227 return old
->sect
== new_section
;
231 object_block_entry_hash (const void *p
)
233 const struct object_block
*old
= (const struct object_block
*) p
;
234 return hash_section (old
->sect
);
237 /* Return a new unnamed section with the given fields. */
240 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
245 sect
= ggc_alloc_section ();
246 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
247 sect
->unnamed
.callback
= callback
;
248 sect
->unnamed
.data
= data
;
249 sect
->unnamed
.next
= unnamed_sections
;
251 unnamed_sections
= sect
;
255 /* Return a SECTION_NOSWITCH section with the given fields. */
258 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
262 sect
= ggc_alloc_section ();
263 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
264 sect
->noswitch
.callback
= callback
;
269 /* Return the named section structure associated with NAME. Create
270 a new section with the given fields if no such structure exists. */
273 get_section (const char *name
, unsigned int flags
, tree decl
)
275 section
*sect
, **slot
;
278 htab_find_slot_with_hash (section_htab
, name
,
279 htab_hash_string (name
), INSERT
);
280 flags
|= SECTION_NAMED
;
283 sect
= ggc_alloc_section ();
284 sect
->named
.common
.flags
= flags
;
285 sect
->named
.name
= ggc_strdup (name
);
286 sect
->named
.decl
= decl
;
292 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
293 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
295 /* It is fine if one of the section flags is
296 SECTION_WRITE | SECTION_RELRO and the other has none of these
297 flags (i.e. read-only) in named sections and either the
298 section hasn't been declared yet or has been declared as writable.
299 In that case just make sure the resulting flags are
300 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
302 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
303 == (SECTION_WRITE
| SECTION_RELRO
)
304 && (sect
->common
.flags
305 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
306 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
307 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
308 || (sect
->common
.flags
& SECTION_WRITE
)))
310 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
313 /* Sanity check user variables for flag changes. */
314 if (sect
->named
.decl
!= NULL
315 && DECL_P (sect
->named
.decl
)
316 && decl
!= sect
->named
.decl
)
318 if (decl
!= NULL
&& DECL_P (decl
))
319 error ("%+D causes a section type conflict with %D",
320 decl
, sect
->named
.decl
);
322 error ("section type conflict with %D", sect
->named
.decl
);
323 inform (DECL_SOURCE_LOCATION (sect
->named
.decl
),
324 "%qD was declared here", sect
->named
.decl
);
326 else if (decl
!= NULL
&& DECL_P (decl
))
327 error ("%+D causes a section type conflict", decl
);
329 error ("section type conflict");
330 /* Make sure we don't error about one section multiple times. */
331 sect
->common
.flags
|= SECTION_OVERRIDE
;
337 /* Return true if the current compilation mode benefits from having
338 objects grouped into blocks. */
341 use_object_blocks_p (void)
343 return flag_section_anchors
;
346 /* Return the object_block structure for section SECT. Create a new
347 structure if we haven't created one already. Return null if SECT
350 static struct object_block
*
351 get_block_for_section (section
*sect
)
353 struct object_block
*block
;
359 slot
= htab_find_slot_with_hash (object_block_htab
, sect
,
360 hash_section (sect
), INSERT
);
361 block
= (struct object_block
*) *slot
;
364 block
= ggc_alloc_cleared_object_block ();
371 /* Create a symbol with label LABEL and place it at byte offset
372 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
373 is not yet known. LABEL must be a garbage-collected string. */
376 create_block_symbol (const char *label
, struct object_block
*block
,
377 HOST_WIDE_INT offset
)
382 /* Create the extended SYMBOL_REF. */
383 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
384 symbol
= ggc_alloc_rtx_def (size
);
386 /* Initialize the normal SYMBOL_REF fields. */
387 memset (symbol
, 0, size
);
388 PUT_CODE (symbol
, SYMBOL_REF
);
389 PUT_MODE (symbol
, Pmode
);
390 XSTR (symbol
, 0) = label
;
391 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
393 /* Initialize the block_symbol stuff. */
394 SYMBOL_REF_BLOCK (symbol
) = block
;
395 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
400 /* Return a section with a particular name and with whatever SECTION_*
401 flags section_type_flags deems appropriate. The name of the section
402 is taken from NAME if nonnull, otherwise it is taken from DECL's
403 DECL_SECTION_NAME. DECL is the decl associated with the section
404 (see the section comment for details) and RELOC is as for
405 section_type_flags. */
408 get_named_section (tree decl
, const char *name
, int reloc
)
414 gcc_assert (decl
&& DECL_P (decl
) && DECL_SECTION_NAME (decl
));
415 name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
418 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
419 return get_section (name
, flags
, decl
);
422 /* If required, set DECL_SECTION_NAME to a unique name. */
425 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
426 int flag_function_or_data_sections
)
428 if (DECL_SECTION_NAME (decl
) == NULL_TREE
429 && targetm_common
.have_named_sections
430 && (flag_function_or_data_sections
431 || DECL_ONE_ONLY (decl
)))
433 targetm
.asm_out
.unique_section (decl
, reloc
);
434 DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
) = true;
438 #ifdef BSS_SECTION_ASM_OP
440 #ifdef ASM_OUTPUT_ALIGNED_BSS
442 /* Utility function for targets to use in implementing
443 ASM_OUTPUT_ALIGNED_BSS.
444 ??? It is believed that this function will work in most cases so such
445 support is localized here. */
448 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
449 const char *name
, unsigned HOST_WIDE_INT size
,
452 switch_to_section (bss_section
);
453 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
454 #ifdef ASM_DECLARE_OBJECT_NAME
455 last_assemble_variable_decl
= decl
;
456 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
458 /* Standard thing is just output label for the object. */
459 ASM_OUTPUT_LABEL (file
, name
);
460 #endif /* ASM_DECLARE_OBJECT_NAME */
461 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
466 #endif /* BSS_SECTION_ASM_OP */
468 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
469 /* Return the hot section for function DECL. Return text_section for
473 hot_function_section (tree decl
)
475 if (decl
!= NULL_TREE
476 && DECL_SECTION_NAME (decl
) != NULL_TREE
477 && targetm_common
.have_named_sections
)
478 return get_named_section (decl
, NULL
, 0);
484 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
487 When DECL_SECTION_NAME is non-NULL and it is implicit section and
488 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
489 concatenate the name with NAMED_SECTION_SUFFIX.
490 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
493 get_named_text_section (tree decl
,
494 const char *text_section_name
,
495 const char *named_section_suffix
)
497 if (decl
&& DECL_SECTION_NAME (decl
))
499 if (named_section_suffix
)
501 tree dsn
= DECL_SECTION_NAME (decl
);
502 const char *stripped_name
;
505 name
= (char *) alloca (TREE_STRING_LENGTH (dsn
) + 1);
506 memcpy (name
, TREE_STRING_POINTER (dsn
),
507 TREE_STRING_LENGTH (dsn
) + 1);
509 stripped_name
= targetm
.strip_name_encoding (name
);
511 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
512 return get_named_section (decl
, buffer
, 0);
514 else if (DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
))
518 /* Do not try to split gnu_linkonce functions. This gets somewhat
520 if (DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
)
522 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
523 name
= targetm
.strip_name_encoding (name
);
524 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
530 return get_named_section (decl
, text_section_name
, 0);
533 /* Choose named function section based on its frequency. */
536 default_function_section (tree decl
, enum node_frequency freq
,
537 bool startup
, bool exit
)
539 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
540 /* Old GNU linkers have buggy --gc-section support, which sometimes
541 results in .gcc_except_table* sections being garbage collected. */
543 && DECL_SECTION_NAME (decl
)
544 && DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
))
548 if (!flag_reorder_functions
549 || !targetm_common
.have_named_sections
)
551 /* Startup code should go to startup subsection unless it is
552 unlikely executed (this happens especially with function splitting
553 where we can split away unnecessary parts of static constructors. */
554 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
555 return get_named_text_section (decl
, ".text.startup", NULL
);
557 /* Similarly for exit. */
558 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
559 return get_named_text_section (decl
, ".text.exit", NULL
);
561 /* Group cold functions together, similarly for hot code. */
564 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
565 return get_named_text_section (decl
, ".text.unlikely", NULL
);
566 case NODE_FREQUENCY_HOT
:
567 return get_named_text_section (decl
, ".text.hot", NULL
);
573 /* Return the section for function DECL.
575 If DECL is NULL_TREE, return the text section. We can be passed
576 NULL_TREE under some circumstances by dbxout.c at least.
578 If FORCE_COLD is true, return cold function section ignoring
579 the frequency info of cgraph_node. */
582 function_section_1 (tree decl
, bool force_cold
)
584 section
*section
= NULL
;
585 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
586 bool startup
= false, exit
= false;
590 struct cgraph_node
*node
= cgraph_get_node (decl
);
594 freq
= node
->frequency
;
595 startup
= node
->only_called_at_startup
;
596 exit
= node
->only_called_at_exit
;
600 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
602 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
603 if (decl
!= NULL_TREE
604 && DECL_SECTION_NAME (decl
) != NULL_TREE
)
606 if (targetm
.asm_out
.function_section
)
607 section
= targetm
.asm_out
.function_section (decl
, freq
,
611 return get_named_section (decl
, NULL
, 0);
614 return targetm
.asm_out
.select_section
615 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
618 if (targetm
.asm_out
.function_section
)
619 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
622 return hot_function_section (decl
);
626 /* Return the section for function DECL.
628 If DECL is NULL_TREE, return the text section. We can be passed
629 NULL_TREE under some circumstances by dbxout.c at least. */
632 function_section (tree decl
)
634 /* Handle cases where function splitting code decides
635 to put function entry point into unlikely executed section
636 despite the fact that the function itself is not cold
637 (i.e. it is called rarely but contains a hot loop that is
638 better to live in hot subsection for the code locality). */
639 return function_section_1 (decl
,
640 first_function_block_is_cold
);
643 /* Return the section for the current function, take IN_COLD_SECTION_P
647 current_function_section (void)
649 return function_section_1 (current_function_decl
, in_cold_section_p
);
652 /* Tell assembler to switch to unlikely-to-be-executed text section. */
655 unlikely_text_section (void)
657 return function_section_1 (current_function_decl
, true);
660 /* When called within a function context, return true if the function
661 has been assigned a cold text section and if SECT is that section.
662 When called outside a function context, return true if SECT is the
663 default cold section. */
666 unlikely_text_section_p (section
*sect
)
668 return sect
== function_section_1 (current_function_decl
, true);
671 /* Return the read-only data section associated with function DECL. */
674 default_function_rodata_section (tree decl
)
676 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
678 const char *name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
680 if (DECL_ONE_ONLY (decl
) && HAVE_COMDAT_GROUP
)
686 dot
= strchr (name
+ 1, '.');
689 len
= strlen (dot
) + 8;
690 rname
= (char *) alloca (len
);
692 strcpy (rname
, ".rodata");
694 return get_section (rname
, SECTION_LINKONCE
, decl
);
696 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
697 else if (DECL_ONE_ONLY (decl
)
698 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
700 size_t len
= strlen (name
) + 1;
701 char *rname
= (char *) alloca (len
);
703 memcpy (rname
, name
, len
);
705 return get_section (rname
, SECTION_LINKONCE
, decl
);
707 /* For .text.foo we want to use .rodata.foo. */
708 else if (flag_function_sections
&& flag_data_sections
709 && strncmp (name
, ".text.", 6) == 0)
711 size_t len
= strlen (name
) + 1;
712 char *rname
= (char *) alloca (len
+ 2);
714 memcpy (rname
, ".rodata", 7);
715 memcpy (rname
+ 7, name
+ 5, len
- 5);
716 return get_section (rname
, 0, decl
);
720 return readonly_data_section
;
723 /* Return the read-only data section associated with function DECL
724 for targets where that section should be always the single
725 readonly data section. */
728 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
730 return readonly_data_section
;
733 /* Return the section to use for string merging. */
736 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
737 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
738 unsigned int flags ATTRIBUTE_UNUSED
)
742 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
743 && TREE_CODE (decl
) == STRING_CST
744 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
746 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
747 && TREE_STRING_LENGTH (decl
) >= len
)
749 enum machine_mode mode
;
750 unsigned int modesize
;
754 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
755 char *name
= (char *) alloca (strlen (prefix
) + 30);
757 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
758 modesize
= GET_MODE_BITSIZE (mode
);
759 if (modesize
>= 8 && modesize
<= 256
760 && (modesize
& (modesize
- 1)) == 0)
762 if (align
< modesize
)
765 str
= TREE_STRING_POINTER (decl
);
766 unit
= GET_MODE_SIZE (mode
);
768 /* Check for embedded NUL characters. */
769 for (i
= 0; i
< len
; i
+= unit
)
771 for (j
= 0; j
< unit
; j
++)
772 if (str
[i
+ j
] != '\0')
779 sprintf (name
, "%s.str%d.%d", prefix
,
780 modesize
/ 8, (int) (align
/ 8));
781 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
782 return get_section (name
, flags
, NULL
);
787 return readonly_data_section
;
790 /* Return the section to use for constant merging. */
793 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
794 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
795 unsigned int flags ATTRIBUTE_UNUSED
)
797 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
799 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
805 && (align
& (align
- 1)) == 0)
807 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
808 char *name
= (char *) alloca (strlen (prefix
) + 30);
810 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
811 flags
|= (align
/ 8) | SECTION_MERGE
;
812 return get_section (name
, flags
, NULL
);
814 return readonly_data_section
;
817 /* Given NAME, a putative register name, discard any customary prefixes. */
820 strip_reg_name (const char *name
)
822 #ifdef REGISTER_PREFIX
823 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
824 name
+= strlen (REGISTER_PREFIX
);
826 if (name
[0] == '%' || name
[0] == '#')
831 /* The user has asked for a DECL to have a particular name. Set (or
832 change) it in such a way that we don't prefix an underscore to
835 set_user_assembler_name (tree decl
, const char *name
)
837 char *starred
= (char *) alloca (strlen (name
) + 2);
839 strcpy (starred
+ 1, name
);
840 change_decl_assembler_name (decl
, get_identifier (starred
));
841 SET_DECL_RTL (decl
, NULL_RTX
);
844 /* Decode an `asm' spec for a declaration as a register name.
845 Return the register number, or -1 if nothing specified,
846 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
847 or -3 if ASMSPEC is `cc' and is not recognized,
848 or -4 if ASMSPEC is `memory' and is not recognized.
849 Accept an exact spelling or a decimal number.
850 Prefixes such as % are optional. */
853 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
855 /* Presume just one register is clobbered. */
862 /* Get rid of confusing prefixes. */
863 asmspec
= strip_reg_name (asmspec
);
865 /* Allow a decimal number as a "register name". */
866 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
867 if (! ISDIGIT (asmspec
[i
]))
869 if (asmspec
[0] != 0 && i
< 0)
872 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0)
878 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
880 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
883 #ifdef OVERLAPPING_REGISTER_NAMES
887 const char *const name
;
890 } table
[] = OVERLAPPING_REGISTER_NAMES
;
892 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
894 && ! strcmp (asmspec
, table
[i
].name
))
896 *pnregs
= table
[i
].nregs
;
897 return table
[i
].number
;
900 #endif /* OVERLAPPING_REGISTER_NAMES */
902 #ifdef ADDITIONAL_REGISTER_NAMES
904 static const struct { const char *const name
; const int number
; } table
[]
905 = ADDITIONAL_REGISTER_NAMES
;
907 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
909 && ! strcmp (asmspec
, table
[i
].name
))
910 return table
[i
].number
;
912 #endif /* ADDITIONAL_REGISTER_NAMES */
914 if (!strcmp (asmspec
, "memory"))
917 if (!strcmp (asmspec
, "cc"))
927 decode_reg_name (const char *name
)
930 return decode_reg_name_and_count (name
, &count
);
934 /* Return true if DECL's initializer is suitable for a BSS section. */
937 bss_initializer_p (const_tree decl
)
939 return (DECL_INITIAL (decl
) == NULL
940 || DECL_INITIAL (decl
) == error_mark_node
941 || (flag_zero_initialized_in_bss
942 /* Leave constant zeroes in .rodata so they
944 && !TREE_READONLY (decl
)
945 && initializer_zerop (DECL_INITIAL (decl
))));
948 /* Compute the alignment of variable specified by DECL.
949 DONT_OUTPUT_DATA is from assemble_variable. */
952 align_variable (tree decl
, bool dont_output_data
)
954 unsigned int align
= DECL_ALIGN (decl
);
956 /* In the case for initialing an array whose length isn't specified,
957 where we have not yet been able to do the layout,
958 figure out the proper alignment now. */
959 if (dont_output_data
&& DECL_SIZE (decl
) == 0
960 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
961 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
963 /* Some object file formats have a maximum alignment which they support.
964 In particular, a.out format supports a maximum alignment of 4. */
965 if (align
> MAX_OFILE_ALIGNMENT
)
967 error ("alignment of %q+D is greater than maximum object "
968 "file alignment %d", decl
,
969 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
970 align
= MAX_OFILE_ALIGNMENT
;
973 if (! DECL_USER_ALIGN (decl
))
975 #ifdef DATA_ABI_ALIGNMENT
976 unsigned int data_abi_align
977 = DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
978 /* For backwards compatibility, don't assume the ABI alignment for
980 if (! DECL_THREAD_LOCAL_P (decl
) || data_abi_align
<= BITS_PER_WORD
)
981 align
= data_abi_align
;
984 /* On some machines, it is good to increase alignment sometimes.
985 But as DECL_ALIGN is used both for actually emitting the variable
986 and for code accessing the variable as guaranteed alignment, we
987 can only increase the alignment if it is a performance optimization
988 if the references to it must bind to the current definition. */
989 if (decl_binds_to_current_def_p (decl
))
991 #ifdef DATA_ALIGNMENT
992 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
993 /* Don't increase alignment too much for TLS variables - TLS space
995 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
998 #ifdef CONSTANT_ALIGNMENT
999 if (DECL_INITIAL (decl
) != 0
1000 && DECL_INITIAL (decl
) != error_mark_node
)
1002 unsigned int const_align
1003 = CONSTANT_ALIGNMENT (DECL_INITIAL (decl
), align
);
1004 /* Don't increase alignment too much for TLS variables - TLS
1005 space is too precious. */
1006 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1007 align
= const_align
;
1013 /* Reset the alignment in case we have made it tighter, so we can benefit
1014 from it in get_pointer_alignment. */
1015 DECL_ALIGN (decl
) = align
;
1018 /* Return DECL_ALIGN (decl), possibly increased for optimization purposes
1019 beyond what align_variable returned. */
1022 get_variable_align (tree decl
)
1024 unsigned int align
= DECL_ALIGN (decl
);
1026 /* For user aligned vars or static vars align_variable already did
1028 if (DECL_USER_ALIGN (decl
) || !TREE_PUBLIC (decl
))
1031 #ifdef DATA_ABI_ALIGNMENT
1032 if (DECL_THREAD_LOCAL_P (decl
))
1033 align
= DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1036 /* For decls that bind to the current definition, align_variable
1037 did also everything, except for not assuming ABI required alignment
1038 of TLS variables. For other vars, increase the alignment here
1039 as an optimization. */
1040 if (!decl_binds_to_current_def_p (decl
))
1042 /* On some machines, it is good to increase alignment sometimes. */
1043 #ifdef DATA_ALIGNMENT
1044 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1045 /* Don't increase alignment too much for TLS variables - TLS space
1047 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1050 #ifdef CONSTANT_ALIGNMENT
1051 if (DECL_INITIAL (decl
) != 0 && DECL_INITIAL (decl
) != error_mark_node
)
1053 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
1055 /* Don't increase alignment too much for TLS variables - TLS space
1057 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1058 align
= const_align
;
1066 /* Return the section into which the given VAR_DECL or CONST_DECL
1067 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1068 section should be used wherever possible. */
1071 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1073 addr_space_t as
= ADDR_SPACE_GENERIC
;
1076 if (TREE_TYPE (decl
) != error_mark_node
)
1077 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1079 if (DECL_COMMON (decl
))
1081 /* If the decl has been given an explicit section name, or it resides
1082 in a non-generic address space, then it isn't common, and shouldn't
1083 be handled as such. */
1084 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1085 && ADDR_SPACE_GENERIC_P (as
));
1086 if (DECL_THREAD_LOCAL_P (decl
))
1087 return tls_comm_section
;
1088 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1089 return comm_section
;
1092 if (DECL_INITIAL (decl
) == error_mark_node
)
1093 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1094 else if (DECL_INITIAL (decl
))
1095 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1099 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1100 if (IN_NAMED_SECTION (decl
))
1101 return get_named_section (decl
, NULL
, reloc
);
1103 if (ADDR_SPACE_GENERIC_P (as
)
1104 && !DECL_THREAD_LOCAL_P (decl
)
1105 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1106 && bss_initializer_p (decl
))
1108 if (!TREE_PUBLIC (decl
)
1109 && !((flag_sanitize
& SANITIZE_ADDRESS
)
1110 && asan_protect_global (decl
)))
1111 return lcomm_section
;
1112 if (bss_noswitch_section
)
1113 return bss_noswitch_section
;
1116 return targetm
.asm_out
.select_section (decl
, reloc
,
1117 get_variable_align (decl
));
1120 /* Return the block into which object_block DECL should be placed. */
1122 static struct object_block
*
1123 get_block_for_decl (tree decl
)
1127 if (TREE_CODE (decl
) == VAR_DECL
)
1129 /* The object must be defined in this translation unit. */
1130 if (DECL_EXTERNAL (decl
))
1133 /* There's no point using object blocks for something that is
1134 isolated by definition. */
1135 if (DECL_ONE_ONLY (decl
))
1139 /* We can only calculate block offsets if the decl has a known
1141 if (DECL_SIZE_UNIT (decl
) == NULL
)
1143 if (!tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
)))
1146 /* Find out which section should contain DECL. We cannot put it into
1147 an object block if it requires a standalone definition. */
1148 if (TREE_CODE (decl
) == VAR_DECL
)
1149 align_variable (decl
, 0);
1150 sect
= get_variable_section (decl
, true);
1151 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1154 return get_block_for_section (sect
);
1157 /* Make sure block symbol SYMBOL is in block BLOCK. */
1160 change_symbol_block (rtx symbol
, struct object_block
*block
)
1162 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1164 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1165 SYMBOL_REF_BLOCK (symbol
) = block
;
1169 /* Return true if it is possible to put DECL in an object_block. */
1172 use_blocks_for_decl_p (tree decl
)
1174 /* Only data DECLs can be placed into object blocks. */
1175 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1178 /* Detect decls created by dw2_force_const_mem. Such decls are
1179 special because DECL_INITIAL doesn't specify the decl's true value.
1180 dw2_output_indirect_constants will instead call assemble_variable
1181 with dont_output_data set to 1 and then print the contents itself. */
1182 if (DECL_INITIAL (decl
) == decl
)
1185 /* If this decl is an alias, then we don't want to emit a
1187 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)))
1190 return targetm
.use_blocks_for_decl_p (decl
);
1193 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1194 have static storage duration. In other words, it should not be an
1195 automatic variable, including PARM_DECLs.
1197 There is, however, one exception: this function handles variables
1198 explicitly placed in a particular register by the user.
1200 This is never called for PARM_DECL nodes. */
1203 make_decl_rtl (tree decl
)
1205 const char *name
= 0;
1209 /* Check that we are not being given an automatic variable. */
1210 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1211 && TREE_CODE (decl
) != RESULT_DECL
);
1213 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1214 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1215 || TREE_STATIC (decl
)
1216 || TREE_PUBLIC (decl
)
1217 || DECL_EXTERNAL (decl
)
1218 || DECL_REGISTER (decl
));
1220 /* And that we were not given a type or a label. */
1221 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1222 && TREE_CODE (decl
) != LABEL_DECL
);
1224 /* For a duplicate declaration, we can be called twice on the
1225 same DECL node. Don't discard the RTL already made. */
1226 if (DECL_RTL_SET_P (decl
))
1228 /* If the old RTL had the wrong mode, fix the mode. */
1229 x
= DECL_RTL (decl
);
1230 if (GET_MODE (x
) != DECL_MODE (decl
))
1231 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1233 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1236 /* ??? Another way to do this would be to maintain a hashed
1237 table of such critters. Instead of adding stuff to a DECL
1238 to give certain attributes to it, we could use an external
1239 hash map from DECL to set of attributes. */
1241 /* Let the target reassign the RTL if it wants.
1242 This is necessary, for example, when one machine specific
1243 decl attribute overrides another. */
1244 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1246 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1247 on the new decl information. */
1249 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1250 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1251 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1256 /* If this variable belongs to the global constant pool, retrieve the
1257 pre-computed RTL or recompute it in LTO mode. */
1258 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_IN_CONSTANT_POOL (decl
))
1260 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1264 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
1266 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1267 && DECL_REGISTER (decl
))
1269 error ("register name not specified for %q+D", decl
);
1271 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1273 const char *asmspec
= name
+1;
1274 enum machine_mode mode
= DECL_MODE (decl
);
1275 reg_number
= decode_reg_name (asmspec
);
1276 /* First detect errors in declaring global registers. */
1277 if (reg_number
== -1)
1278 error ("register name not specified for %q+D", decl
);
1279 else if (reg_number
< 0)
1280 error ("invalid register name for %q+D", decl
);
1281 else if (mode
== BLKmode
)
1282 error ("data type of %q+D isn%'t suitable for a register",
1284 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1285 error ("the register specified for %q+D cannot be accessed"
1286 " by the current target", decl
);
1287 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1288 error ("the register specified for %q+D is not general enough"
1289 " to be used as a register variable", decl
);
1290 else if (!HARD_REGNO_MODE_OK (reg_number
, mode
))
1291 error ("register specified for %q+D isn%'t suitable for data type",
1293 /* Now handle properly declared static register variables. */
1298 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1300 DECL_INITIAL (decl
) = 0;
1301 error ("global register variable has initial value");
1303 if (TREE_THIS_VOLATILE (decl
))
1304 warning (OPT_Wvolatile_register_var
,
1305 "optimization may eliminate reads and/or "
1306 "writes to register variables");
1308 /* If the user specified one of the eliminables registers here,
1309 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1310 confused with that register and be eliminated. This usage is
1311 somewhat suspect... */
1313 SET_DECL_RTL (decl
, gen_rtx_raw_REG (mode
, reg_number
));
1314 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1315 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1317 if (TREE_STATIC (decl
))
1319 /* Make this register global, so not usable for anything
1321 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1322 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1323 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1325 nregs
= hard_regno_nregs
[reg_number
][mode
];
1327 globalize_reg (decl
, reg_number
+ --nregs
);
1330 /* As a register variable, it has no section. */
1334 /* Now handle ordinary static variables and functions (in memory).
1335 Also handle vars declared register invalidly. */
1336 else if (name
[0] == '*')
1338 #ifdef REGISTER_PREFIX
1339 if (strlen (REGISTER_PREFIX
) != 0)
1341 reg_number
= decode_reg_name (name
);
1342 if (reg_number
>= 0 || reg_number
== -3)
1343 error ("register name given for non-register variable %q+D", decl
);
1348 /* Specifying a section attribute on a variable forces it into a
1349 non-.bss section, and thus it cannot be common. */
1350 /* FIXME: In general this code should not be necessary because
1351 visibility pass is doing the same work. But notice_global_symbol
1352 is called early and it needs to make DECL_RTL to get the name.
1353 we take care of recomputing the DECL_RTL after visibility is changed. */
1354 if (TREE_CODE (decl
) == VAR_DECL
1355 && DECL_SECTION_NAME (decl
) != NULL_TREE
1356 && DECL_INITIAL (decl
) == NULL_TREE
1357 && DECL_COMMON (decl
))
1358 DECL_COMMON (decl
) = 0;
1360 /* Variables can't be both common and weak. */
1361 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1362 DECL_COMMON (decl
) = 0;
1364 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1365 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1368 enum machine_mode address_mode
= Pmode
;
1369 if (TREE_TYPE (decl
) != error_mark_node
)
1371 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1372 address_mode
= targetm
.addr_space
.address_mode (as
);
1374 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1376 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1377 SET_SYMBOL_REF_DECL (x
, decl
);
1379 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1380 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1381 set_mem_attributes (x
, decl
, 1);
1382 SET_DECL_RTL (decl
, x
);
1384 /* Optionally set flags or add text to the name to record information
1385 such as that it is a function name.
1386 If the name is changed, the macro ASM_OUTPUT_LABELREF
1387 will have to know how to strip this information. */
1388 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1391 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1392 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1396 make_decl_rtl_for_debug (tree decl
)
1398 unsigned int save_aliasing_flag
;
1401 if (DECL_RTL_SET_P (decl
))
1402 return DECL_RTL (decl
);
1404 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1405 call new_alias_set. If running with -fcompare-debug, sometimes
1406 we do not want to create alias sets that will throw the alias
1407 numbers off in the comparison dumps. So... clearing
1408 flag_strict_aliasing will keep new_alias_set() from creating a
1410 save_aliasing_flag
= flag_strict_aliasing
;
1411 flag_strict_aliasing
= 0;
1413 rtl
= DECL_RTL (decl
);
1414 /* Reset DECL_RTL back, as various parts of the compiler expects
1415 DECL_RTL set meaning it is actually going to be output. */
1416 SET_DECL_RTL (decl
, NULL
);
1418 flag_strict_aliasing
= save_aliasing_flag
;
1422 /* Output a string of literal assembler code
1423 for an `asm' keyword used between functions. */
1426 assemble_asm (tree string
)
1431 if (TREE_CODE (string
) == ADDR_EXPR
)
1432 string
= TREE_OPERAND (string
, 0);
1434 p
= TREE_STRING_POINTER (string
);
1435 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1438 /* Write the address of the entity given by SYMBOL to SEC. */
1440 assemble_addr_to_section (rtx symbol
, section
*sec
)
1442 switch_to_section (sec
);
1443 assemble_align (POINTER_SIZE
);
1444 assemble_integer (symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1447 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1448 not) section for PRIORITY. */
1450 get_cdtor_priority_section (int priority
, bool constructor_p
)
1454 /* ??? This only works reliably with the GNU linker. */
1455 sprintf (buf
, "%s.%.5u",
1456 constructor_p
? ".ctors" : ".dtors",
1457 /* Invert the numbering so the linker puts us in the proper
1458 order; constructors are run from right to left, and the
1459 linker sorts in increasing order. */
1460 MAX_INIT_PRIORITY
- priority
);
1461 return get_section (buf
, SECTION_WRITE
, NULL
);
1465 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1469 if (priority
!= DEFAULT_INIT_PRIORITY
)
1470 sec
= get_cdtor_priority_section (priority
,
1471 /*constructor_p=*/false);
1473 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1475 assemble_addr_to_section (symbol
, sec
);
1478 #ifdef DTORS_SECTION_ASM_OP
1480 default_dtor_section_asm_out_destructor (rtx symbol
,
1481 int priority ATTRIBUTE_UNUSED
)
1483 assemble_addr_to_section (symbol
, dtors_section
);
1488 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1492 if (priority
!= DEFAULT_INIT_PRIORITY
)
1493 sec
= get_cdtor_priority_section (priority
,
1494 /*constructor_p=*/true);
1496 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1498 assemble_addr_to_section (symbol
, sec
);
1501 #ifdef CTORS_SECTION_ASM_OP
1503 default_ctor_section_asm_out_constructor (rtx symbol
,
1504 int priority ATTRIBUTE_UNUSED
)
1506 assemble_addr_to_section (symbol
, ctors_section
);
1510 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1511 a nonzero value if the constant pool should be output before the
1512 start of the function, or a zero value if the pool should output
1513 after the end of the function. The default is to put it before the
1516 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1517 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1520 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1521 to be output to assembler.
1522 Set first_global_object_name and weak_global_object_name as appropriate. */
1525 notice_global_symbol (tree decl
)
1527 const char **type
= &first_global_object_name
;
1529 if (first_global_object_name
1530 || !TREE_PUBLIC (decl
)
1531 || DECL_EXTERNAL (decl
)
1532 || !DECL_NAME (decl
)
1533 || (TREE_CODE (decl
) != FUNCTION_DECL
1534 && (TREE_CODE (decl
) != VAR_DECL
1535 || (DECL_COMMON (decl
)
1536 && (DECL_INITIAL (decl
) == 0
1537 || DECL_INITIAL (decl
) == error_mark_node
))))
1538 || !MEM_P (DECL_RTL (decl
)))
1541 /* We win when global object is found, but it is useful to know about weak
1542 symbol as well so we can produce nicer unique names. */
1543 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1544 type
= &weak_global_object_name
;
1550 rtx decl_rtl
= DECL_RTL (decl
);
1552 p
= targetm
.strip_name_encoding (XSTR (XEXP (decl_rtl
, 0), 0));
1553 name
= ggc_strdup (p
);
1559 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1560 current function goes into the cold section, so that targets can use
1561 current_function_section during RTL expansion. DECL describes the
1565 decide_function_section (tree decl
)
1567 first_function_block_is_cold
= false;
1569 if (flag_reorder_blocks_and_partition
)
1570 /* We will decide in assemble_start_function. */
1573 if (DECL_SECTION_NAME (decl
))
1575 struct cgraph_node
*node
= cgraph_get_node (current_function_decl
);
1576 /* Calls to function_section rely on first_function_block_is_cold
1578 first_function_block_is_cold
= (node
1580 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1583 in_cold_section_p
= first_function_block_is_cold
;
1586 /* Output assembler code for the constant pool of a function and associated
1587 with defining the name of the function. DECL describes the function.
1588 NAME is the function's name. For the constant pool, we use the current
1589 constant pool data. */
1592 assemble_start_function (tree decl
, const char *fnname
)
1595 char tmp_label
[100];
1596 bool hot_label_written
= false;
1598 if (flag_reorder_blocks_and_partition
)
1600 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1601 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1602 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1603 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1604 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1605 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1606 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1607 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1612 crtl
->subsections
.hot_section_label
= NULL
;
1613 crtl
->subsections
.cold_section_label
= NULL
;
1614 crtl
->subsections
.hot_section_end_label
= NULL
;
1615 crtl
->subsections
.cold_section_end_label
= NULL
;
1618 /* The following code does not need preprocessing in the assembler. */
1622 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1623 output_constant_pool (fnname
, decl
);
1625 /* Make sure the not and cold text (code) sections are properly
1626 aligned. This is necessary here in the case where the function
1627 has both hot and cold sections, because we don't want to re-set
1628 the alignment when the section switch happens mid-function. */
1630 if (flag_reorder_blocks_and_partition
)
1632 first_function_block_is_cold
= false;
1634 switch_to_section (unlikely_text_section ());
1635 assemble_align (DECL_ALIGN (decl
));
1636 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1638 /* When the function starts with a cold section, we need to explicitly
1639 align the hot section and write out the hot section label.
1640 But if the current function is a thunk, we do not have a CFG. */
1642 && BB_PARTITION (ENTRY_BLOCK_PTR_FOR_FN (cfun
)->next_bb
) == BB_COLD_PARTITION
)
1644 switch_to_section (text_section
);
1645 assemble_align (DECL_ALIGN (decl
));
1646 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1647 hot_label_written
= true;
1648 first_function_block_is_cold
= true;
1650 in_cold_section_p
= first_function_block_is_cold
;
1654 /* Switch to the correct text section for the start of the function. */
1656 switch_to_section (function_section (decl
));
1657 if (flag_reorder_blocks_and_partition
1658 && !hot_label_written
)
1659 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1661 /* Tell assembler to move to target machine's alignment for functions. */
1662 align
= floor_log2 (DECL_ALIGN (decl
) / BITS_PER_UNIT
);
1665 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1668 /* Handle a user-specified function alignment.
1669 Note that we still need to align to DECL_ALIGN, as above,
1670 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1671 if (! DECL_USER_ALIGN (decl
)
1672 && align_functions_log
> align
1673 && optimize_function_for_speed_p (cfun
))
1675 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1676 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1677 align_functions_log
, align_functions
- 1);
1679 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1683 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1684 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1687 if (!DECL_IGNORED_P (decl
))
1688 (*debug_hooks
->begin_function
) (decl
);
1690 /* Make function name accessible from other files, if appropriate. */
1692 if (TREE_PUBLIC (decl
))
1694 notice_global_symbol (decl
);
1696 globalize_decl (decl
);
1698 maybe_assemble_visibility (decl
);
1701 if (DECL_PRESERVE_P (decl
))
1702 targetm
.asm_out
.mark_decl_preserved (fnname
);
1704 /* Do any machine/system dependent processing of the function name. */
1705 #ifdef ASM_DECLARE_FUNCTION_NAME
1706 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1708 /* Standard thing is just output label for the function. */
1709 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1710 #endif /* ASM_DECLARE_FUNCTION_NAME */
1712 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1713 saw_no_split_stack
= true;
1716 /* Output assembler code associated with defining the size of the
1717 function. DECL describes the function. NAME is the function's name. */
1720 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1722 #ifdef ASM_DECLARE_FUNCTION_SIZE
1723 /* We could have switched section in the middle of the function. */
1724 if (flag_reorder_blocks_and_partition
)
1725 switch_to_section (function_section (decl
));
1726 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1728 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1730 output_constant_pool (fnname
, decl
);
1731 switch_to_section (function_section (decl
)); /* need to switch back */
1733 /* Output labels for end of hot/cold text sections (to be used by
1735 if (flag_reorder_blocks_and_partition
)
1737 section
*save_text_section
;
1739 save_text_section
= in_section
;
1740 switch_to_section (unlikely_text_section ());
1741 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1742 if (first_function_block_is_cold
)
1743 switch_to_section (text_section
);
1745 switch_to_section (function_section (decl
));
1746 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1747 switch_to_section (save_text_section
);
1751 /* Assemble code to leave SIZE bytes of zeros. */
1754 assemble_zeros (unsigned HOST_WIDE_INT size
)
1756 /* Do no output if -fsyntax-only. */
1757 if (flag_syntax_only
)
1760 #ifdef ASM_NO_SKIP_IN_TEXT
1761 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1762 so we must output 0s explicitly in the text section. */
1763 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1765 unsigned HOST_WIDE_INT i
;
1766 for (i
= 0; i
< size
; i
++)
1767 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1772 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1775 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1778 assemble_align (int align
)
1780 if (align
> BITS_PER_UNIT
)
1782 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1786 /* Assemble a string constant with the specified C string as contents. */
1789 assemble_string (const char *p
, int size
)
1794 /* If the string is very long, split it up. */
1798 int thissize
= size
- pos
;
1799 if (thissize
> maximum
)
1802 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1810 /* A noswitch_section_callback for lcomm_section. */
1813 emit_local (tree decl ATTRIBUTE_UNUSED
,
1814 const char *name ATTRIBUTE_UNUSED
,
1815 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1816 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1818 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1819 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1820 size
, DECL_ALIGN (decl
));
1822 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1823 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1826 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1831 /* A noswitch_section_callback for bss_noswitch_section. */
1833 #if defined ASM_OUTPUT_ALIGNED_BSS
1835 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1836 const char *name ATTRIBUTE_UNUSED
,
1837 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1838 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1840 #if defined ASM_OUTPUT_ALIGNED_BSS
1841 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
,
1842 get_variable_align (decl
));
1848 /* A noswitch_section_callback for comm_section. */
1851 emit_common (tree decl ATTRIBUTE_UNUSED
,
1852 const char *name ATTRIBUTE_UNUSED
,
1853 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1854 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1856 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1857 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1858 size
, get_variable_align (decl
));
1860 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1861 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
,
1862 get_variable_align (decl
));
1865 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1870 /* A noswitch_section_callback for tls_comm_section. */
1873 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1874 const char *name ATTRIBUTE_UNUSED
,
1875 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1876 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1878 #ifdef ASM_OUTPUT_TLS_COMMON
1879 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
1882 sorry ("thread-local COMMON data not implemented");
1887 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1888 NAME is the name of DECL's SYMBOL_REF. */
1891 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
,
1894 unsigned HOST_WIDE_INT size
, rounded
;
1896 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
1899 if ((flag_sanitize
& SANITIZE_ADDRESS
) && asan_protect_global (decl
))
1900 size
+= asan_red_zone_size (size
);
1902 /* Don't allocate zero bytes of common,
1903 since that means "undefined external" in the linker. */
1907 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1908 so that each uninitialized object starts on such a boundary. */
1909 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
1910 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
1911 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
1913 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
1914 && (unsigned HOST_WIDE_INT
) (align
/ BITS_PER_UNIT
) > rounded
)
1915 error ("requested alignment for %q+D is greater than "
1916 "implemented alignment of %wu", decl
, rounded
);
1919 /* A subroutine of assemble_variable. Output the label and contents of
1920 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1921 is as for assemble_variable. */
1924 assemble_variable_contents (tree decl
, const char *name
,
1925 bool dont_output_data
)
1927 /* Do any machine/system dependent processing of the object. */
1928 #ifdef ASM_DECLARE_OBJECT_NAME
1929 last_assemble_variable_decl
= decl
;
1930 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
1932 /* Standard thing is just output label for the object. */
1933 ASM_OUTPUT_LABEL (asm_out_file
, name
);
1934 #endif /* ASM_DECLARE_OBJECT_NAME */
1936 if (!dont_output_data
)
1938 if (DECL_INITIAL (decl
)
1939 && DECL_INITIAL (decl
) != error_mark_node
1940 && !initializer_zerop (DECL_INITIAL (decl
)))
1941 /* Output the actual data. */
1942 output_constant (DECL_INITIAL (decl
),
1943 tree_to_uhwi (DECL_SIZE_UNIT (decl
)),
1944 get_variable_align (decl
));
1946 /* Leave space for it. */
1947 assemble_zeros (tree_to_uhwi (DECL_SIZE_UNIT (decl
)));
1951 /* Assemble everything that is needed for a variable or function declaration.
1952 Not used for automatic variables, and not used for function definitions.
1953 Should not be called for variables of incomplete structure type.
1955 TOP_LEVEL is nonzero if this variable has file scope.
1956 AT_END is nonzero if this is the special handling, at end of compilation,
1957 to define things that have had only tentative definitions.
1958 DONT_OUTPUT_DATA if nonzero means don't actually output the
1959 initial value (that will be done by the caller). */
1962 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
1963 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
1966 rtx decl_rtl
, symbol
;
1969 bool asan_protected
= false;
1971 /* This function is supposed to handle VARIABLES. Ensure we have one. */
1972 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
1974 /* Emulated TLS had better not get this far. */
1975 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
1977 last_assemble_variable_decl
= 0;
1979 /* Normally no need to say anything here for external references,
1980 since assemble_external is called by the language-specific code
1981 when a declaration is first seen. */
1983 if (DECL_EXTERNAL (decl
))
1986 /* Do nothing for global register variables. */
1987 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
1989 TREE_ASM_WRITTEN (decl
) = 1;
1993 /* If type was incomplete when the variable was declared,
1994 see if it is complete now. */
1996 if (DECL_SIZE (decl
) == 0)
1997 layout_decl (decl
, 0);
1999 /* Still incomplete => don't allocate it; treat the tentative defn
2000 (which is what it must have been) as an `extern' reference. */
2002 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2004 error ("storage size of %q+D isn%'t known", decl
);
2005 TREE_ASM_WRITTEN (decl
) = 1;
2009 /* The first declaration of a variable that comes through this function
2010 decides whether it is global (in C, has external linkage)
2011 or local (in C, has internal linkage). So do nothing more
2012 if this function has already run. */
2014 if (TREE_ASM_WRITTEN (decl
))
2017 /* Make sure targetm.encode_section_info is invoked before we set
2019 decl_rtl
= DECL_RTL (decl
);
2021 TREE_ASM_WRITTEN (decl
) = 1;
2023 /* Do no output if -fsyntax-only. */
2024 if (flag_syntax_only
)
2027 if (! dont_output_data
2028 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
2030 error ("size of variable %q+D is too large", decl
);
2034 gcc_assert (MEM_P (decl_rtl
));
2035 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2036 symbol
= XEXP (decl_rtl
, 0);
2038 /* If this symbol belongs to the tree constant pool, output the constant
2039 if it hasn't already been written. */
2040 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
2042 tree decl
= SYMBOL_REF_DECL (symbol
);
2043 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
2044 output_constant_def_contents (symbol
);
2050 name
= XSTR (symbol
, 0);
2051 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2052 notice_global_symbol (decl
);
2054 /* Compute the alignment of this data. */
2056 align_variable (decl
, dont_output_data
);
2058 if ((flag_sanitize
& SANITIZE_ADDRESS
)
2059 && asan_protect_global (decl
))
2061 asan_protected
= true;
2062 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
2063 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
2066 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2068 align
= get_variable_align (decl
);
2070 if (TREE_PUBLIC (decl
))
2071 maybe_assemble_visibility (decl
);
2073 if (DECL_PRESERVE_P (decl
))
2074 targetm
.asm_out
.mark_decl_preserved (name
);
2076 /* First make the assembler name(s) global if appropriate. */
2077 sect
= get_variable_section (decl
, false);
2078 if (TREE_PUBLIC (decl
)
2079 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2080 globalize_decl (decl
);
2082 /* Output any data that we will need to use the address of. */
2083 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2084 output_addressed_constants (DECL_INITIAL (decl
));
2086 /* dbxout.c needs to know this. */
2087 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2088 DECL_IN_TEXT_SECTION (decl
) = 1;
2090 /* If the decl is part of an object_block, make sure that the decl
2091 has been positioned within its block, but do not write out its
2092 definition yet. output_object_blocks will do that later. */
2093 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2095 gcc_assert (!dont_output_data
);
2096 place_block_symbol (symbol
);
2098 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2099 assemble_noswitch_variable (decl
, name
, sect
, align
);
2102 /* The following bit of code ensures that vtable_map
2103 variables are not only in the comdat section, but that
2104 each variable has its own unique comdat name. If this
2105 code is removed, the variables end up in the same section
2106 with a single comdat name.
2108 FIXME: resolve_unique_section needs to deal better with
2109 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
2110 that is fixed, this if-else statement can be replaced with
2111 a single call to "switch_to_section (sect)". */
2112 if (sect
->named
.name
2113 && (strcmp (sect
->named
.name
, ".vtable_map_vars") == 0))
2115 #if defined (OBJECT_FORMAT_ELF)
2116 targetm
.asm_out
.named_section (sect
->named
.name
,
2117 sect
->named
.common
.flags
2122 switch_to_section (sect
);
2126 switch_to_section (sect
);
2127 if (align
> BITS_PER_UNIT
)
2128 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
2129 assemble_variable_contents (decl
, name
, dont_output_data
);
2132 unsigned HOST_WIDE_INT
int size
2133 = tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2134 assemble_zeros (asan_red_zone_size (size
));
2140 /* Given a function declaration (FN_DECL), this function assembles the
2141 function into the .preinit_array section. */
2144 assemble_vtv_preinit_initializer (tree fn_decl
)
2147 unsigned flags
= SECTION_WRITE
;
2148 rtx symbol
= XEXP (DECL_RTL (fn_decl
), 0);
2150 flags
|= SECTION_NOTYPE
;
2151 sect
= get_section (".preinit_array", flags
, fn_decl
);
2152 switch_to_section (sect
);
2153 assemble_addr_to_section (symbol
, sect
);
2156 /* Return 1 if type TYPE contains any pointers. */
2159 contains_pointers_p (tree type
)
2161 switch (TREE_CODE (type
))
2164 case REFERENCE_TYPE
:
2165 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2166 so I'll play safe and return 1. */
2172 case QUAL_UNION_TYPE
:
2175 /* For a type that has fields, see if the fields have pointers. */
2176 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2177 if (TREE_CODE (fields
) == FIELD_DECL
2178 && contains_pointers_p (TREE_TYPE (fields
)))
2184 /* An array type contains pointers if its element type does. */
2185 return contains_pointers_p (TREE_TYPE (type
));
2192 /* We delay assemble_external processing until
2193 the compilation unit is finalized. This is the best we can do for
2194 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2195 it all the way to final. See PR 17982 for further discussion. */
2196 static GTY(()) tree pending_assemble_externals
;
2198 #ifdef ASM_OUTPUT_EXTERNAL
2199 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2200 As a result, assemble_external can be called after the list of externals
2201 is processed and the pointer set destroyed. */
2202 static bool pending_assemble_externals_processed
;
2204 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2205 TREE_LIST in assemble_external. */
2206 static struct pointer_set_t
*pending_assemble_externals_set
;
2208 /* True if DECL is a function decl for which no out-of-line copy exists.
2209 It is assumed that DECL's assembler name has been set. */
2212 incorporeal_function_p (tree decl
)
2214 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2218 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2219 && (DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
2220 || DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA_WITH_ALIGN
))
2223 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2224 /* Atomic or sync builtins which have survived this far will be
2225 resolved externally and therefore are not incorporeal. */
2226 if (strncmp (name
, "__builtin_", 10) == 0)
2232 /* Actually do the tests to determine if this is necessary, and invoke
2233 ASM_OUTPUT_EXTERNAL. */
2235 assemble_external_real (tree decl
)
2237 rtx rtl
= DECL_RTL (decl
);
2239 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2240 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2241 && !incorporeal_function_p (decl
))
2243 /* Some systems do require some output. */
2244 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2245 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2251 process_pending_assemble_externals (void)
2253 #ifdef ASM_OUTPUT_EXTERNAL
2255 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2256 assemble_external_real (TREE_VALUE (list
));
2258 pending_assemble_externals
= 0;
2259 pending_assemble_externals_processed
= true;
2260 pointer_set_destroy (pending_assemble_externals_set
);
2264 /* This TREE_LIST contains any weak symbol declarations waiting
2266 static GTY(()) tree weak_decls
;
2268 /* Output something to declare an external symbol to the assembler,
2269 and qualifiers such as weakness. (Most assemblers don't need
2270 extern declaration, so we normally output nothing.) Do nothing if
2271 DECL is not external. */
2274 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2276 /* Make sure that the ASM_OUT_FILE is open.
2277 If it's not, we should not be calling this function. */
2278 gcc_assert (asm_out_file
);
2280 /* In a perfect world, the following condition would be true.
2281 Sadly, the Java and Go front ends emit assembly *from the front end*,
2282 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2284 /* This function should only be called if we are expanding, or have
2286 Ideally, only final.c would be calling this function, but it is
2287 not clear whether that would break things somehow. See PR 17982
2288 for further discussion. */
2289 gcc_assert (cgraph_state
== CGRAPH_STATE_EXPANSION
2290 || cgraph_state
== CGRAPH_STATE_FINISHED
);
2293 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2296 /* We want to output annotation for weak and external symbols at
2297 very last to check if they are references or not. */
2299 if (TARGET_SUPPORTS_WEAK
2301 /* TREE_STATIC is a weird and abused creature which is not
2302 generally the right test for whether an entity has been
2303 locally emitted, inlined or otherwise not-really-extern, but
2304 for declarations that can be weak, it happens to be
2306 && !TREE_STATIC (decl
)
2307 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2308 && value_member (decl
, weak_decls
) == NULL_TREE
)
2309 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2311 #ifdef ASM_OUTPUT_EXTERNAL
2312 if (pending_assemble_externals_processed
)
2314 assemble_external_real (decl
);
2318 if (! pointer_set_insert (pending_assemble_externals_set
, decl
))
2319 pending_assemble_externals
= tree_cons (NULL
, decl
,
2320 pending_assemble_externals
);
2324 /* Similar, for calling a library function FUN. */
2327 assemble_external_libcall (rtx fun
)
2329 /* Declare library function name external when first used, if nec. */
2330 if (! SYMBOL_REF_USED (fun
))
2332 SYMBOL_REF_USED (fun
) = 1;
2333 targetm
.asm_out
.external_libcall (fun
);
2337 /* Assemble a label named NAME. */
2340 assemble_label (FILE *file
, const char *name
)
2342 ASM_OUTPUT_LABEL (file
, name
);
2345 /* Set the symbol_referenced flag for ID. */
2347 mark_referenced (tree id
)
2349 TREE_SYMBOL_REFERENCED (id
) = 1;
2352 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2354 mark_decl_referenced (tree decl
)
2356 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2358 /* Extern inline functions don't become needed when referenced.
2359 If we know a method will be emitted in other TU and no new
2360 functions can be marked reachable, just use the external
2362 struct cgraph_node
*node
= cgraph_get_create_node (decl
);
2363 if (!DECL_EXTERNAL (decl
)
2364 && !node
->definition
)
2365 cgraph_mark_force_output_node (node
);
2367 else if (TREE_CODE (decl
) == VAR_DECL
)
2369 struct varpool_node
*node
= varpool_node_for_decl (decl
);
2370 /* C++ frontend use mark_decl_references to force COMDAT variables
2371 to be output that might appear dead otherwise. */
2372 node
->force_output
= true;
2374 /* else do nothing - we can get various sorts of CST nodes here,
2375 which do not need to be marked. */
2379 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2380 until we find an identifier that is not itself a transparent alias.
2381 Modify the alias passed to it by reference (and all aliases on the
2382 way to the ultimate target), such that they do not have to be
2383 followed again, and return the ultimate target of the alias
2387 ultimate_transparent_alias_target (tree
*alias
)
2389 tree target
= *alias
;
2391 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
2393 gcc_assert (TREE_CHAIN (target
));
2394 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
2395 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
2396 && ! TREE_CHAIN (target
));
2403 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2404 starts with a *, the rest of NAME is output verbatim. Otherwise
2405 NAME is transformed in a target-specific way (usually by the
2406 addition of an underscore). */
2409 assemble_name_raw (FILE *file
, const char *name
)
2412 fputs (&name
[1], file
);
2414 ASM_OUTPUT_LABELREF (file
, name
);
2417 /* Like assemble_name_raw, but should be used when NAME might refer to
2418 an entity that is also represented as a tree (like a function or
2419 variable). If NAME does refer to such an entity, that entity will
2420 be marked as referenced. */
2423 assemble_name (FILE *file
, const char *name
)
2425 const char *real_name
;
2428 real_name
= targetm
.strip_name_encoding (name
);
2430 id
= maybe_get_identifier (real_name
);
2435 mark_referenced (id
);
2436 ultimate_transparent_alias_target (&id
);
2438 name
= IDENTIFIER_POINTER (id
);
2439 gcc_assert (! TREE_CHAIN (id
));
2442 assemble_name_raw (file
, name
);
2445 /* Allocate SIZE bytes writable static space with a gensym name
2446 and return an RTX to refer to its address. */
2449 assemble_static_space (unsigned HOST_WIDE_INT size
)
2452 const char *namestring
;
2455 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2457 namestring
= ggc_strdup (name
);
2459 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2460 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2462 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2463 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2466 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2467 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2470 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2471 so that each uninitialized object starts on such a boundary. */
2472 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2473 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2474 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2475 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2476 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2477 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2484 /* Assemble the static constant template for function entry trampolines.
2485 This is done at most once per compilation.
2486 Returns an RTX for the address of the template. */
2488 static GTY(()) rtx initial_trampoline
;
2491 assemble_trampoline_template (void)
2498 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2500 if (initial_trampoline
)
2501 return initial_trampoline
;
2503 /* By default, put trampoline templates in read-only data section. */
2505 #ifdef TRAMPOLINE_SECTION
2506 switch_to_section (TRAMPOLINE_SECTION
);
2508 switch_to_section (readonly_data_section
);
2511 /* Write the assembler code to define one. */
2512 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2514 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2516 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2517 targetm
.asm_out
.trampoline_template (asm_out_file
);
2519 /* Record the rtl to refer to it. */
2520 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2521 name
= ggc_strdup (label
);
2522 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2523 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2525 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2526 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2527 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2529 return initial_trampoline
;
2532 /* A and B are either alignments or offsets. Return the minimum alignment
2533 that may be assumed after adding the two together. */
2535 static inline unsigned
2536 min_align (unsigned int a
, unsigned int b
)
2538 return (a
| b
) & -(a
| b
);
2541 /* Return the assembler directive for creating a given kind of integer
2542 object. SIZE is the number of bytes in the object and ALIGNED_P
2543 indicates whether it is known to be aligned. Return NULL if the
2544 assembly dialect has no such directive.
2546 The returned string should be printed at the start of a new line and
2547 be followed immediately by the object's initial value. */
2550 integer_asm_op (int size
, int aligned_p
)
2552 struct asm_int_op
*ops
;
2555 ops
= &targetm
.asm_out
.aligned_op
;
2557 ops
= &targetm
.asm_out
.unaligned_op
;
2562 return targetm
.asm_out
.byte_op
;
2576 /* Use directive OP to assemble an integer object X. Print OP at the
2577 start of the line, followed immediately by the value of X. */
2580 assemble_integer_with_op (const char *op
, rtx x
)
2582 fputs (op
, asm_out_file
);
2583 output_addr_const (asm_out_file
, x
);
2584 fputc ('\n', asm_out_file
);
2587 /* The default implementation of the asm_out.integer target hook. */
2590 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2591 unsigned int size ATTRIBUTE_UNUSED
,
2592 int aligned_p ATTRIBUTE_UNUSED
)
2594 const char *op
= integer_asm_op (size
, aligned_p
);
2595 /* Avoid GAS bugs for large values. Specifically negative values whose
2596 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2597 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE
/ BITS_PER_UNIT
)
2599 return op
&& (assemble_integer_with_op (op
, x
), true);
2602 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2603 the alignment of the integer in bits. Return 1 if we were able to output
2604 the constant, otherwise 0. We must be able to output the constant,
2605 if FORCE is nonzero. */
2608 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2612 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2614 /* See if the target hook can handle this kind of object. */
2615 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2618 /* If the object is a multi-byte one, try splitting it up. Split
2619 it into words it if is multi-word, otherwise split it into bytes. */
2622 enum machine_mode omode
, imode
;
2623 unsigned int subalign
;
2624 unsigned int subsize
, i
;
2625 enum mode_class mclass
;
2627 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2628 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2629 if (GET_CODE (x
) == CONST_FIXED
)
2630 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2634 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2635 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2637 for (i
= 0; i
< size
; i
+= subsize
)
2639 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2640 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2646 /* If we've printed some of it, but not all of it, there's no going
2651 gcc_assert (!force
);
2657 assemble_real (REAL_VALUE_TYPE d
, enum machine_mode mode
, unsigned int align
)
2659 long data
[4] = {0, 0, 0, 0};
2661 int bitsize
, nelts
, nunits
, units_per
;
2663 /* This is hairy. We have a quantity of known size. real_to_target
2664 will put it into an array of *host* longs, 32 bits per element
2665 (even if long is more than 32 bits). We need to determine the
2666 number of array elements that are occupied (nelts) and the number
2667 of *target* min-addressable units that will be occupied in the
2668 object file (nunits). We cannot assume that 32 divides the
2669 mode's bitsize (size * BITS_PER_UNIT) evenly.
2671 size * BITS_PER_UNIT is used here to make sure that padding bits
2672 (which might appear at either end of the value; real_to_target
2673 will include the padding bits in its output array) are included. */
2675 nunits
= GET_MODE_SIZE (mode
);
2676 bitsize
= nunits
* BITS_PER_UNIT
;
2677 nelts
= CEIL (bitsize
, 32);
2678 units_per
= 32 / BITS_PER_UNIT
;
2680 real_to_target (data
, &d
, mode
);
2682 /* Put out the first word with the specified alignment. */
2683 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2684 nunits
-= units_per
;
2686 /* Subsequent words need only 32-bit alignment. */
2687 align
= min_align (align
, 32);
2689 for (i
= 1; i
< nelts
; i
++)
2691 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2692 nunits
-= units_per
;
2696 /* Given an expression EXP with a constant value,
2697 reduce it to the sum of an assembler symbol and an integer.
2698 Store them both in the structure *VALUE.
2699 EXP must be reducible. */
2703 HOST_WIDE_INT offset
;
2707 decode_addr_const (tree exp
, struct addr_const
*value
)
2709 tree target
= TREE_OPERAND (exp
, 0);
2715 if (TREE_CODE (target
) == COMPONENT_REF
2716 && tree_fits_shwi_p (byte_position (TREE_OPERAND (target
, 1))))
2718 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2719 target
= TREE_OPERAND (target
, 0);
2721 else if (TREE_CODE (target
) == ARRAY_REF
2722 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2724 offset
+= (tree_to_uhwi (TYPE_SIZE_UNIT (TREE_TYPE (target
)))
2725 * tree_to_shwi (TREE_OPERAND (target
, 1)));
2726 target
= TREE_OPERAND (target
, 0);
2728 else if (TREE_CODE (target
) == MEM_REF
2729 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2731 offset
+= mem_ref_offset (target
).to_short_addr ();
2732 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2734 else if (TREE_CODE (target
) == INDIRECT_REF
2735 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2736 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2738 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2743 switch (TREE_CODE (target
))
2747 x
= DECL_RTL (target
);
2751 x
= gen_rtx_MEM (FUNCTION_MODE
,
2752 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2761 x
= output_constant_def (target
, 1);
2768 gcc_assert (MEM_P (x
));
2772 value
->offset
= offset
;
2776 static GTY((param_is (struct constant_descriptor_tree
)))
2777 htab_t const_desc_htab
;
2779 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2781 /* Constant pool accessor function. */
2784 constant_pool_htab (void)
2786 return const_desc_htab
;
2789 /* Compute a hash code for a constant expression. */
2792 const_desc_hash (const void *ptr
)
2794 return ((const struct constant_descriptor_tree
*)ptr
)->hash
;
2798 const_hash_1 (const tree exp
)
2803 enum tree_code code
= TREE_CODE (exp
);
2805 /* Either set P and LEN to the address and len of something to hash and
2806 exit the switch or return a value. */
2811 p
= (char *) &TREE_INT_CST_ELT (exp
, 0);
2812 len
= TREE_INT_CST_NUNITS (exp
) * sizeof (HOST_WIDE_INT
);
2816 return real_hash (TREE_REAL_CST_PTR (exp
));
2819 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2822 p
= TREE_STRING_POINTER (exp
);
2823 len
= TREE_STRING_LENGTH (exp
);
2827 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2828 + const_hash_1 (TREE_IMAGPART (exp
)));
2834 hi
= 7 + VECTOR_CST_NELTS (exp
);
2836 for (i
= 0; i
< VECTOR_CST_NELTS (exp
); ++i
)
2837 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ELT (exp
, i
));
2844 unsigned HOST_WIDE_INT idx
;
2847 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2849 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2851 hi
= hi
* 603 + const_hash_1 (value
);
2859 struct addr_const value
;
2861 decode_addr_const (exp
, &value
);
2862 switch (GET_CODE (value
.base
))
2865 /* Don't hash the address of the SYMBOL_REF;
2866 only use the offset and the symbol name. */
2868 p
= XSTR (value
.base
, 0);
2869 for (i
= 0; p
[i
] != 0; i
++)
2870 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2874 hi
= value
.offset
+ CODE_LABEL_NUMBER (XEXP (value
.base
, 0)) * 13;
2884 case POINTER_PLUS_EXPR
:
2886 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2887 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2890 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2893 /* A language specific constant. Just hash the code. */
2897 /* Compute hashing function. */
2899 for (i
= 0; i
< len
; i
++)
2900 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2905 /* Wrapper of compare_constant, for the htab interface. */
2907 const_desc_eq (const void *p1
, const void *p2
)
2909 const struct constant_descriptor_tree
*const c1
2910 = (const struct constant_descriptor_tree
*) p1
;
2911 const struct constant_descriptor_tree
*const c2
2912 = (const struct constant_descriptor_tree
*) p2
;
2913 if (c1
->hash
!= c2
->hash
)
2915 return compare_constant (c1
->value
, c2
->value
);
2918 /* Compare t1 and t2, and return 1 only if they are known to result in
2919 the same bit pattern on output. */
2922 compare_constant (const tree t1
, const tree t2
)
2924 enum tree_code typecode
;
2926 if (t1
== NULL_TREE
)
2927 return t2
== NULL_TREE
;
2928 if (t2
== NULL_TREE
)
2931 if (TREE_CODE (t1
) != TREE_CODE (t2
))
2934 switch (TREE_CODE (t1
))
2937 /* Integer constants are the same only if the same width of type. */
2938 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2940 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2942 return tree_int_cst_equal (t1
, t2
);
2945 /* Real constants are the same only if the same width of type. */
2946 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2949 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
2952 /* Fixed constants are the same only if the same width of type. */
2953 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2956 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
2959 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2962 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
2963 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
2964 TREE_STRING_LENGTH (t1
)));
2967 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
2968 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
2974 if (VECTOR_CST_NELTS (t1
) != VECTOR_CST_NELTS (t2
))
2977 for (i
= 0; i
< VECTOR_CST_NELTS (t1
); ++i
)
2978 if (!compare_constant (VECTOR_CST_ELT (t1
, i
),
2979 VECTOR_CST_ELT (t2
, i
)))
2987 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
2988 unsigned HOST_WIDE_INT idx
;
2990 typecode
= TREE_CODE (TREE_TYPE (t1
));
2991 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
2994 if (typecode
== ARRAY_TYPE
)
2996 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
2997 /* For arrays, check that the sizes all match. */
2998 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
3000 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
3005 /* For record and union constructors, require exact type
3007 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
3011 v1
= CONSTRUCTOR_ELTS (t1
);
3012 v2
= CONSTRUCTOR_ELTS (t2
);
3013 if (vec_safe_length (v1
) != vec_safe_length (v2
))
3016 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
3018 constructor_elt
*c1
= &(*v1
)[idx
];
3019 constructor_elt
*c2
= &(*v2
)[idx
];
3021 /* Check that each value is the same... */
3022 if (!compare_constant (c1
->value
, c2
->value
))
3024 /* ... and that they apply to the same fields! */
3025 if (typecode
== ARRAY_TYPE
)
3027 if (!compare_constant (c1
->index
, c2
->index
))
3032 if (c1
->index
!= c2
->index
)
3043 struct addr_const value1
, value2
;
3047 decode_addr_const (t1
, &value1
);
3048 decode_addr_const (t2
, &value2
);
3050 if (value1
.offset
!= value2
.offset
)
3053 code
= GET_CODE (value1
.base
);
3054 if (code
!= GET_CODE (value2
.base
))
3060 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3064 ret
= (CODE_LABEL_NUMBER (XEXP (value1
.base
, 0))
3065 == CODE_LABEL_NUMBER (XEXP (value2
.base
, 0)));
3075 case POINTER_PLUS_EXPR
:
3078 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3079 && compare_constant (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3082 case VIEW_CONVERT_EXPR
:
3083 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3092 /* Make a copy of the whole tree structure for a constant. This
3093 handles the same types of nodes that compare_constant handles. */
3096 copy_constant (tree exp
)
3098 switch (TREE_CODE (exp
))
3101 /* For ADDR_EXPR, we do not want to copy the decl whose address
3102 is requested. We do want to copy constants though. */
3103 if (CONSTANT_CLASS_P (TREE_OPERAND (exp
, 0)))
3104 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3105 copy_constant (TREE_OPERAND (exp
, 0)));
3107 return copy_node (exp
);
3113 return copy_node (exp
);
3116 return build_complex (TREE_TYPE (exp
),
3117 copy_constant (TREE_REALPART (exp
)),
3118 copy_constant (TREE_IMAGPART (exp
)));
3121 case POINTER_PLUS_EXPR
:
3123 return build2 (TREE_CODE (exp
), TREE_TYPE (exp
),
3124 copy_constant (TREE_OPERAND (exp
, 0)),
3125 copy_constant (TREE_OPERAND (exp
, 1)));
3128 case VIEW_CONVERT_EXPR
:
3129 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3130 copy_constant (TREE_OPERAND (exp
, 0)));
3133 return build_vector (TREE_TYPE (exp
), VECTOR_CST_ELTS (exp
));
3137 tree copy
= copy_node (exp
);
3138 vec
<constructor_elt
, va_gc
> *v
;
3139 unsigned HOST_WIDE_INT idx
;
3140 tree purpose
, value
;
3142 vec_alloc (v
, vec_safe_length (CONSTRUCTOR_ELTS (exp
)));
3143 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp
), idx
, purpose
, value
)
3145 constructor_elt ce
= {purpose
, copy_constant (value
)};
3148 CONSTRUCTOR_ELTS (copy
) = v
;
3157 /* Return the section into which constant EXP should be placed. */
3160 get_constant_section (tree exp
, unsigned int align
)
3162 return targetm
.asm_out
.select_section (exp
,
3163 compute_reloc_for_constant (exp
),
3167 /* Return the size of constant EXP in bytes. */
3169 static HOST_WIDE_INT
3170 get_constant_size (tree exp
)
3174 size
= int_size_in_bytes (TREE_TYPE (exp
));
3175 if (TREE_CODE (exp
) == STRING_CST
)
3176 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3180 /* Subroutine of output_constant_def:
3181 No constant equal to EXP is known to have been output.
3182 Make a constant descriptor to enter EXP in the hash table.
3183 Assign the label number and construct RTL to refer to the
3184 constant's location in memory.
3185 Caller is responsible for updating the hash table. */
3187 static struct constant_descriptor_tree
*
3188 build_constant_desc (tree exp
)
3190 struct constant_descriptor_tree
*desc
;
3196 desc
= ggc_alloc_constant_descriptor_tree ();
3197 desc
->value
= copy_constant (exp
);
3199 /* Create a string containing the label name, in LABEL. */
3200 labelno
= const_labelno
++;
3201 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3203 /* Construct the VAR_DECL associated with the constant. */
3204 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3206 DECL_ARTIFICIAL (decl
) = 1;
3207 DECL_IGNORED_P (decl
) = 1;
3208 TREE_READONLY (decl
) = 1;
3209 TREE_STATIC (decl
) = 1;
3210 TREE_ADDRESSABLE (decl
) = 1;
3211 /* We don't set the RTL yet as this would cause varpool to assume that the
3212 variable is referenced. Moreover, it would just be dropped in LTO mode.
3213 Instead we set the flag that will be recognized in make_decl_rtl. */
3214 DECL_IN_CONSTANT_POOL (decl
) = 1;
3215 DECL_INITIAL (decl
) = desc
->value
;
3216 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3217 architectures so use DATA_ALIGNMENT as well, except for strings. */
3218 if (TREE_CODE (exp
) == STRING_CST
)
3220 #ifdef CONSTANT_ALIGNMENT
3221 DECL_ALIGN (decl
) = CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
));
3225 align_variable (decl
, 0);
3227 /* Now construct the SYMBOL_REF and the MEM. */
3228 if (use_object_blocks_p ())
3230 section
*sect
= get_constant_section (exp
, DECL_ALIGN (decl
));
3231 symbol
= create_block_symbol (ggc_strdup (label
),
3232 get_block_for_section (sect
), -1);
3235 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3236 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3237 SET_SYMBOL_REF_DECL (symbol
, decl
);
3238 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3240 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3241 set_mem_attributes (rtl
, exp
, 1);
3242 set_mem_alias_set (rtl
, 0);
3243 set_mem_alias_set (rtl
, const_alias_set
);
3245 /* We cannot share RTX'es in pool entries.
3246 Mark this piece of RTL as required for unsharing. */
3247 RTX_FLAG (rtl
, used
) = 1;
3249 /* Set flags or add text to the name to record information, such as
3250 that it is a local symbol. If the name is changed, the macro
3251 ASM_OUTPUT_LABELREF will have to know how to strip this
3252 information. This call might invalidate our local variable
3253 SYMBOL; we can't use it afterward. */
3254 targetm
.encode_section_info (exp
, rtl
, true);
3261 /* Return an rtx representing a reference to constant data in memory
3262 for the constant expression EXP.
3264 If assembler code for such a constant has already been output,
3265 return an rtx to refer to it.
3266 Otherwise, output such a constant in memory
3267 and generate an rtx for it.
3269 If DEFER is nonzero, this constant can be deferred and output only
3270 if referenced in the function after all optimizations.
3272 `const_desc_table' records which constants already have label strings. */
3275 output_constant_def (tree exp
, int defer
)
3277 struct constant_descriptor_tree
*desc
;
3278 struct constant_descriptor_tree key
;
3281 /* Look up EXP in the table of constant descriptors. If we didn't find
3282 it, create a new one. */
3284 key
.hash
= const_hash_1 (exp
);
3285 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3287 desc
= (struct constant_descriptor_tree
*) *loc
;
3290 desc
= build_constant_desc (exp
);
3291 desc
->hash
= key
.hash
;
3295 maybe_output_constant_def_contents (desc
, defer
);
3299 /* Subroutine of output_constant_def: Decide whether or not we need to
3300 output the constant DESC now, and if so, do it. */
3302 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3305 rtx symbol
= XEXP (desc
->rtl
, 0);
3306 tree exp
= desc
->value
;
3308 if (flag_syntax_only
)
3311 if (TREE_ASM_WRITTEN (exp
))
3312 /* Already output; don't do it again. */
3315 /* We can always defer constants as long as the context allows
3319 /* Increment n_deferred_constants if it exists. It needs to be at
3320 least as large as the number of constants actually referred to
3321 by the function. If it's too small we'll stop looking too early
3322 and fail to emit constants; if it's too large we'll only look
3323 through the entire function when we could have stopped earlier. */
3325 n_deferred_constants
++;
3329 output_constant_def_contents (symbol
);
3332 /* Subroutine of output_constant_def_contents. Output the definition
3333 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3334 constant's alignment in bits. */
3337 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3341 size
= get_constant_size (exp
);
3343 /* Do any machine/system dependent processing of the constant. */
3344 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3346 /* Output the value of EXP. */
3347 output_constant (exp
, size
, align
);
3350 /* We must output the constant data referred to by SYMBOL; do so. */
3353 output_constant_def_contents (rtx symbol
)
3355 tree decl
= SYMBOL_REF_DECL (symbol
);
3356 tree exp
= DECL_INITIAL (decl
);
3358 bool asan_protected
= false;
3360 /* Make sure any other constants whose addresses appear in EXP
3361 are assigned label numbers. */
3362 output_addressed_constants (exp
);
3364 /* We are no longer deferring this constant. */
3365 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3367 if ((flag_sanitize
& SANITIZE_ADDRESS
)
3368 && TREE_CODE (exp
) == STRING_CST
3369 && asan_protect_global (exp
))
3371 asan_protected
= true;
3372 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
3373 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
3376 /* If the constant is part of an object block, make sure that the
3377 decl has been positioned within its block, but do not write out
3378 its definition yet. output_object_blocks will do that later. */
3379 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3380 place_block_symbol (symbol
);
3383 align
= DECL_ALIGN (decl
);
3384 switch_to_section (get_constant_section (exp
, align
));
3385 if (align
> BITS_PER_UNIT
)
3386 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3387 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3390 HOST_WIDE_INT size
= get_constant_size (exp
);
3391 assemble_zeros (asan_red_zone_size (size
));
3396 /* Look up EXP in the table of constant descriptors. Return the rtl
3397 if it has been emitted, else null. */
3400 lookup_constant_def (tree exp
)
3402 struct constant_descriptor_tree
*desc
;
3403 struct constant_descriptor_tree key
;
3406 key
.hash
= const_hash_1 (exp
);
3407 desc
= (struct constant_descriptor_tree
*)
3408 htab_find_with_hash (const_desc_htab
, &key
, key
.hash
);
3410 return (desc
? desc
->rtl
: NULL_RTX
);
3413 /* Return a tree representing a reference to constant data in memory
3414 for the constant expression EXP.
3416 This is the counterpart of output_constant_def at the Tree level. */
3419 tree_output_constant_def (tree exp
)
3421 struct constant_descriptor_tree
*desc
, key
;
3425 /* Look up EXP in the table of constant descriptors. If we didn't find
3426 it, create a new one. */
3428 key
.hash
= const_hash_1 (exp
);
3429 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3431 desc
= (struct constant_descriptor_tree
*) *loc
;
3434 desc
= build_constant_desc (exp
);
3435 desc
->hash
= key
.hash
;
3439 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3440 varpool_finalize_decl (decl
);
3444 /* Used in the hash tables to avoid outputting the same constant
3445 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3446 are output once per function, not once per file. */
3447 /* ??? Only a few targets need per-function constant pools. Most
3448 can use one per-file pool. Should add a targetm bit to tell the
3451 struct GTY(()) rtx_constant_pool
{
3452 /* Pointers to first and last constant in pool, as ordered by offset. */
3453 struct constant_descriptor_rtx
*first
;
3454 struct constant_descriptor_rtx
*last
;
3456 /* Hash facility for making memory-constants from constant rtl-expressions.
3457 It is used on RISC machines where immediate integer arguments and
3458 constant addresses are restricted so that such constants must be stored
3460 htab_t
GTY((param_is (struct constant_descriptor_rtx
))) const_rtx_htab
;
3462 /* Current offset in constant pool (does not include any
3463 machine-specific header). */
3464 HOST_WIDE_INT offset
;
3467 struct GTY((chain_next ("%h.next"))) constant_descriptor_rtx
{
3468 struct constant_descriptor_rtx
*next
;
3472 HOST_WIDE_INT offset
;
3474 enum machine_mode mode
;
3480 /* Hash and compare functions for const_rtx_htab. */
3483 const_desc_rtx_hash (const void *ptr
)
3485 const struct constant_descriptor_rtx
*const desc
3486 = (const struct constant_descriptor_rtx
*) ptr
;
3491 const_desc_rtx_eq (const void *a
, const void *b
)
3493 const struct constant_descriptor_rtx
*const x
3494 = (const struct constant_descriptor_rtx
*) a
;
3495 const struct constant_descriptor_rtx
*const y
3496 = (const struct constant_descriptor_rtx
*) b
;
3498 if (x
->mode
!= y
->mode
)
3500 return rtx_equal_p (x
->constant
, y
->constant
);
3503 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3506 const_rtx_hash_1 (rtx
*xp
, void *data
)
3508 unsigned HOST_WIDE_INT hwi
;
3509 enum machine_mode mode
;
3516 code
= GET_CODE (x
);
3517 mode
= GET_MODE (x
);
3518 h
= (hashval_t
) code
* 1048573 + mode
;
3527 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3528 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3530 h
^= (hashval_t
) hwi
;
3531 for (i
= 1; i
< n
; ++i
)
3534 h
^= (hashval_t
) hwi
;
3539 case CONST_WIDE_INT
:
3540 hwi
= GET_MODE_PRECISION (mode
);
3542 for (i
= 0; i
< CONST_WIDE_INT_NUNITS (x
); i
++)
3543 hwi
^= CONST_WIDE_INT_ELT (x
, i
);
3548 if (TARGET_SUPPORTS_WIDE_INT
== 0 && mode
== VOIDmode
)
3550 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3554 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3558 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3564 for (i
= XVECLEN (x
, 0); i
-- > 0; )
3565 h
= h
* 251 + const_rtx_hash_1 (&XVECEXP (x
, 0, i
), data
);
3570 h
^= htab_hash_string (XSTR (x
, 0));
3574 h
= h
* 251 + CODE_LABEL_NUMBER (XEXP (x
, 0));
3578 case UNSPEC_VOLATILE
:
3579 h
= h
* 251 + XINT (x
, 1);
3586 hp
= (hashval_t
*) data
;
3587 *hp
= *hp
* 509 + h
;
3591 /* Compute a hash value for X, which should be a constant. */
3594 const_rtx_hash (rtx x
)
3597 for_each_rtx (&x
, const_rtx_hash_1
, &h
);
3602 /* Create and return a new rtx constant pool. */
3604 static struct rtx_constant_pool
*
3605 create_constant_pool (void)
3607 struct rtx_constant_pool
*pool
;
3609 pool
= ggc_alloc_rtx_constant_pool ();
3610 pool
->const_rtx_htab
= htab_create_ggc (31, const_desc_rtx_hash
,
3611 const_desc_rtx_eq
, NULL
);
3618 /* Initialize constant pool hashing for a new function. */
3621 init_varasm_status (void)
3623 crtl
->varasm
.pool
= create_constant_pool ();
3624 crtl
->varasm
.deferred_constants
= 0;
3627 /* Given a MINUS expression, simplify it if both sides
3628 include the same symbol. */
3631 simplify_subtraction (rtx x
)
3633 rtx r
= simplify_rtx (x
);
3637 /* Given a constant rtx X, make (or find) a memory constant for its value
3638 and return a MEM rtx to refer to it in memory. */
3641 force_const_mem (enum machine_mode mode
, rtx x
)
3643 struct constant_descriptor_rtx
*desc
, tmp
;
3644 struct rtx_constant_pool
*pool
;
3651 /* If we're not allowed to drop X into the constant pool, don't. */
3652 if (targetm
.cannot_force_const_mem (mode
, x
))
3655 /* Record that this function has used a constant pool entry. */
3656 crtl
->uses_const_pool
= 1;
3658 /* Decide which pool to use. */
3659 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3660 ? shared_constant_pool
3661 : crtl
->varasm
.pool
);
3663 /* Lookup the value in the hashtable. */
3666 hash
= const_rtx_hash (x
);
3667 slot
= htab_find_slot_with_hash (pool
->const_rtx_htab
, &tmp
, hash
, INSERT
);
3668 desc
= (struct constant_descriptor_rtx
*) *slot
;
3670 /* If the constant was already present, return its memory. */
3672 return copy_rtx (desc
->mem
);
3674 /* Otherwise, create a new descriptor. */
3675 desc
= ggc_alloc_constant_descriptor_rtx ();
3678 /* Align the location counter as required by EXP's data type. */
3679 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3680 #ifdef CONSTANT_ALIGNMENT
3682 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3683 if (type
!= NULL_TREE
)
3684 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3688 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3689 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3692 desc
->constant
= copy_rtx (tmp
.constant
);
3693 desc
->offset
= pool
->offset
;
3696 desc
->align
= align
;
3697 desc
->labelno
= const_labelno
;
3700 pool
->offset
+= GET_MODE_SIZE (mode
);
3702 pool
->last
->next
= desc
;
3704 pool
->first
= pool
->last
= desc
;
3707 /* Create a string containing the label name, in LABEL. */
3708 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3711 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3712 the constants pool. */
3713 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3715 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3716 symbol
= create_block_symbol (ggc_strdup (label
),
3717 get_block_for_section (sect
), -1);
3720 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3722 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3723 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3724 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3726 /* Construct the MEM. */
3727 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3728 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3729 set_mem_align (def
, align
);
3731 /* If we're dropping a label to the constant pool, make sure we
3733 if (GET_CODE (x
) == LABEL_REF
)
3734 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3736 return copy_rtx (def
);
3739 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3742 get_pool_constant (rtx addr
)
3744 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3747 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3748 and whether it has been output or not. */
3751 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3753 struct constant_descriptor_rtx
*desc
;
3755 desc
= SYMBOL_REF_CONSTANT (addr
);
3756 *pmarked
= (desc
->mark
!= 0);
3757 return desc
->constant
;
3760 /* Similar, return the mode. */
3763 get_pool_mode (const_rtx addr
)
3765 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3768 /* Return the size of the constant pool. */
3771 get_pool_size (void)
3773 return crtl
->varasm
.pool
->offset
;
3776 /* Worker function for output_constant_pool_1. Emit assembly for X
3777 in MODE with known alignment ALIGN. */
3780 output_constant_pool_2 (enum machine_mode mode
, rtx x
, unsigned int align
)
3782 switch (GET_MODE_CLASS (mode
))
3785 case MODE_DECIMAL_FLOAT
:
3789 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3790 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3791 assemble_real (r
, mode
, align
);
3796 case MODE_PARTIAL_INT
:
3801 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3804 case MODE_VECTOR_FLOAT
:
3805 case MODE_VECTOR_INT
:
3806 case MODE_VECTOR_FRACT
:
3807 case MODE_VECTOR_UFRACT
:
3808 case MODE_VECTOR_ACCUM
:
3809 case MODE_VECTOR_UACCUM
:
3812 enum machine_mode submode
= GET_MODE_INNER (mode
);
3813 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3815 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3816 units
= CONST_VECTOR_NUNITS (x
);
3818 for (i
= 0; i
< units
; i
++)
3820 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3821 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3831 /* Worker function for output_constant_pool. Emit constant DESC,
3832 giving it ALIGN bits of alignment. */
3835 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3842 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3843 whose CODE_LABEL has been deleted. This can occur if a jump table
3844 is eliminated by optimization. If so, write a constant of zero
3845 instead. Note that this can also happen by turning the
3846 CODE_LABEL into a NOTE. */
3847 /* ??? This seems completely and utterly wrong. Certainly it's
3848 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3849 functioning even with INSN_DELETED_P and friends. */
3852 switch (GET_CODE (tmp
))
3855 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3856 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3858 tmp
= XEXP (XEXP (tmp
, 0), 0);
3862 tmp
= XEXP (tmp
, 0);
3863 gcc_assert (!INSN_DELETED_P (tmp
));
3864 gcc_assert (!NOTE_P (tmp
)
3865 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3872 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3873 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3874 align
, desc
->labelno
, done
);
3877 assemble_align (align
);
3879 /* Output the label. */
3880 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3882 /* Output the data. */
3883 output_constant_pool_2 (desc
->mode
, x
, align
);
3885 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3886 sections have proper size. */
3887 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3889 && (in_section
->common
.flags
& SECTION_MERGE
))
3890 assemble_align (align
);
3892 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3898 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3899 to as used. Emit referenced deferred strings. This function can
3900 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3903 mark_constant (rtx
*current_rtx
, void *data ATTRIBUTE_UNUSED
)
3905 rtx x
= *current_rtx
;
3907 if (x
== NULL_RTX
|| GET_CODE (x
) != SYMBOL_REF
)
3910 if (CONSTANT_POOL_ADDRESS_P (x
))
3912 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3913 if (desc
->mark
== 0)
3916 for_each_rtx (&desc
->constant
, mark_constant
, NULL
);
3919 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3921 tree decl
= SYMBOL_REF_DECL (x
);
3922 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
3924 n_deferred_constants
--;
3925 output_constant_def_contents (x
);
3932 /* Look through appropriate parts of INSN, marking all entries in the
3933 constant pool which are actually being used. Entries that are only
3934 referenced by other constants are also marked as used. Emit
3935 deferred strings that are used. */
3938 mark_constants (rtx insn
)
3943 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3944 insns, not any notes that may be attached. We don't want to mark
3945 a constant just because it happens to appear in a REG_EQUIV note. */
3946 if (GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3948 rtx seq
= PATTERN (insn
);
3949 int i
, n
= XVECLEN (seq
, 0);
3950 for (i
= 0; i
< n
; ++i
)
3952 rtx subinsn
= XVECEXP (seq
, 0, i
);
3953 if (INSN_P (subinsn
))
3954 for_each_rtx (&PATTERN (subinsn
), mark_constant
, NULL
);
3958 for_each_rtx (&PATTERN (insn
), mark_constant
, NULL
);
3961 /* Look through the instructions for this function, and mark all the
3962 entries in POOL which are actually being used. Emit deferred constants
3963 which have indeed been used. */
3966 mark_constant_pool (void)
3970 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
3973 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3974 mark_constants (insn
);
3977 /* Write all the constants in POOL. */
3980 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
3982 struct constant_descriptor_rtx
*desc
;
3984 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3987 /* If the constant is part of an object_block, make sure that
3988 the constant has been positioned within its block, but do not
3989 write out its definition yet. output_object_blocks will do
3991 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
3992 && SYMBOL_REF_BLOCK (desc
->sym
))
3993 place_block_symbol (desc
->sym
);
3996 switch_to_section (targetm
.asm_out
.select_rtx_section
3997 (desc
->mode
, desc
->constant
, desc
->align
));
3998 output_constant_pool_1 (desc
, desc
->align
);
4003 /* Mark all constants that are used in the current function, then write
4004 out the function's private constant pool. */
4007 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
4008 tree fndecl ATTRIBUTE_UNUSED
)
4010 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
4012 /* It is possible for gcc to call force_const_mem and then to later
4013 discard the instructions which refer to the constant. In such a
4014 case we do not need to output the constant. */
4015 mark_constant_pool ();
4017 #ifdef ASM_OUTPUT_POOL_PROLOGUE
4018 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4021 output_constant_pool_contents (pool
);
4023 #ifdef ASM_OUTPUT_POOL_EPILOGUE
4024 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4028 /* Write the contents of the shared constant pool. */
4031 output_shared_constant_pool (void)
4033 output_constant_pool_contents (shared_constant_pool
);
4036 /* Determine what kind of relocations EXP may need. */
4039 compute_reloc_for_constant (tree exp
)
4041 int reloc
= 0, reloc2
;
4044 switch (TREE_CODE (exp
))
4048 /* Go inside any operations that get_inner_reference can handle and see
4049 if what's inside is a constant: no need to do anything here for
4050 addresses of variables or functions. */
4051 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4052 tem
= TREE_OPERAND (tem
, 0))
4055 if (TREE_CODE (tem
) == MEM_REF
4056 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
4058 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
4062 if (TREE_PUBLIC (tem
))
4069 case POINTER_PLUS_EXPR
:
4070 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4071 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4075 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4076 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4077 /* The difference of two local labels is computable at link time. */
4078 if (reloc
== 1 && reloc2
== 1)
4085 case VIEW_CONVERT_EXPR
:
4086 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4091 unsigned HOST_WIDE_INT idx
;
4092 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4094 reloc
|= compute_reloc_for_constant (tem
);
4104 /* Find all the constants whose addresses are referenced inside of EXP,
4105 and make sure assembler code with a label has been output for each one.
4106 Indicate whether an ADDR_EXPR has been encountered. */
4109 output_addressed_constants (tree exp
)
4113 switch (TREE_CODE (exp
))
4117 /* Go inside any operations that get_inner_reference can handle and see
4118 if what's inside is a constant: no need to do anything here for
4119 addresses of variables or functions. */
4120 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4121 tem
= TREE_OPERAND (tem
, 0))
4124 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4125 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4126 tem
= DECL_INITIAL (tem
);
4128 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4129 output_constant_def (tem
, 0);
4131 if (TREE_CODE (tem
) == MEM_REF
)
4132 output_addressed_constants (TREE_OPERAND (tem
, 0));
4136 case POINTER_PLUS_EXPR
:
4138 output_addressed_constants (TREE_OPERAND (exp
, 1));
4142 case VIEW_CONVERT_EXPR
:
4143 output_addressed_constants (TREE_OPERAND (exp
, 0));
4148 unsigned HOST_WIDE_INT idx
;
4149 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4151 output_addressed_constants (tem
);
4160 /* Whether a constructor CTOR is a valid static constant initializer if all
4161 its elements are. This used to be internal to initializer_constant_valid_p
4162 and has been exposed to let other functions like categorize_ctor_elements
4163 evaluate the property while walking a constructor for other purposes. */
4166 constructor_static_from_elts_p (const_tree ctor
)
4168 return (TREE_CONSTANT (ctor
)
4169 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4170 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4171 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4174 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4177 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4178 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4179 which are valid when ENDTYPE is an integer of any size; in
4180 particular, this does not accept a pointer minus a constant. This
4181 returns null_pointer_node if the VALUE is an absolute constant
4182 which can be used to initialize a static variable. Otherwise it
4186 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4190 if (!INTEGRAL_TYPE_P (endtype
))
4193 op0
= TREE_OPERAND (value
, 0);
4194 op1
= TREE_OPERAND (value
, 1);
4196 /* Like STRIP_NOPS except allow the operand mode to widen. This
4197 works around a feature of fold that simplifies (int)(p1 - p2) to
4198 ((int)p1 - (int)p2) under the theory that the narrower operation
4201 while (CONVERT_EXPR_P (op0
)
4202 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4204 tree inner
= TREE_OPERAND (op0
, 0);
4205 if (inner
== error_mark_node
4206 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4207 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4208 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4213 while (CONVERT_EXPR_P (op1
)
4214 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4216 tree inner
= TREE_OPERAND (op1
, 0);
4217 if (inner
== error_mark_node
4218 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4219 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4220 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4225 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4229 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4230 cache
? cache
+ 2 : NULL
);
4231 /* Both initializers must be known. */
4235 && (op0
== null_pointer_node
4236 || TREE_CODE (value
) == MINUS_EXPR
))
4237 return null_pointer_node
;
4239 /* Support differences between labels. */
4240 if (TREE_CODE (op0
) == LABEL_DECL
4241 && TREE_CODE (op1
) == LABEL_DECL
)
4242 return null_pointer_node
;
4244 if (TREE_CODE (op0
) == STRING_CST
4245 && TREE_CODE (op1
) == STRING_CST
4246 && operand_equal_p (op0
, op1
, 1))
4247 return null_pointer_node
;
4253 /* Helper function of initializer_constant_valid_p.
4254 Return nonzero if VALUE is a valid constant-valued expression
4255 for use in initializing a static variable; one that can be an
4256 element of a "constant" initializer.
4258 Return null_pointer_node if the value is absolute;
4259 if it is relocatable, return the variable that determines the relocation.
4260 We assume that VALUE has been folded as much as possible;
4261 therefore, we do not need to check for such things as
4262 arithmetic-combinations of integers.
4264 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4267 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4271 switch (TREE_CODE (value
))
4274 if (constructor_static_from_elts_p (value
))
4276 unsigned HOST_WIDE_INT idx
;
4278 bool absolute
= true;
4280 if (cache
&& cache
[0] == value
)
4282 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4285 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4292 cache
[1] = NULL_TREE
;
4296 if (reloc
!= null_pointer_node
)
4299 /* For a non-absolute relocation, there is no single
4300 variable that can be "the variable that determines the
4305 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4307 return absolute
? null_pointer_node
: error_mark_node
;
4310 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4318 return null_pointer_node
;
4323 tree op0
= staticp (TREE_OPERAND (value
, 0));
4326 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4327 to be a constant, this is old-skool offsetof-like nonsense. */
4328 if (TREE_CODE (op0
) == INDIRECT_REF
4329 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4330 return null_pointer_node
;
4331 /* Taking the address of a nested function involves a trampoline,
4332 unless we don't need or want one. */
4333 if (TREE_CODE (op0
) == FUNCTION_DECL
4334 && DECL_STATIC_CHAIN (op0
)
4335 && !TREE_NO_TRAMPOLINE (value
))
4337 /* "&{...}" requires a temporary to hold the constructed
4339 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4345 case NON_LVALUE_EXPR
:
4346 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4349 case VIEW_CONVERT_EXPR
:
4351 tree src
= TREE_OPERAND (value
, 0);
4352 tree src_type
= TREE_TYPE (src
);
4353 tree dest_type
= TREE_TYPE (value
);
4355 /* Allow view-conversions from aggregate to non-aggregate type only
4356 if the bit pattern is fully preserved afterwards; otherwise, the
4357 RTL expander won't be able to apply a subsequent transformation
4358 to the underlying constructor. */
4359 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4361 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4362 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4367 /* Allow all other kinds of view-conversion. */
4368 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4373 tree src
= TREE_OPERAND (value
, 0);
4374 tree src_type
= TREE_TYPE (src
);
4375 tree dest_type
= TREE_TYPE (value
);
4377 /* Allow conversions between pointer types, floating-point
4378 types, and offset types. */
4379 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4380 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4381 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4382 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4383 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4385 /* Allow length-preserving conversions between integer types. */
4386 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4387 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4388 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4390 /* Allow conversions between other integer types only if
4392 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4394 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4395 if (inner
== null_pointer_node
)
4396 return null_pointer_node
;
4400 /* Allow (int) &foo provided int is as wide as a pointer. */
4401 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4402 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4403 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4405 /* Likewise conversions from int to pointers, but also allow
4406 conversions from 0. */
4407 if ((POINTER_TYPE_P (dest_type
)
4408 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4409 && INTEGRAL_TYPE_P (src_type
))
4411 if (TREE_CODE (src
) == INTEGER_CST
4412 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4413 return null_pointer_node
;
4414 if (integer_zerop (src
))
4415 return null_pointer_node
;
4416 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4417 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4420 /* Allow conversions to struct or union types if the value
4422 if (TREE_CODE (dest_type
) == RECORD_TYPE
4423 || TREE_CODE (dest_type
) == UNION_TYPE
)
4424 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4428 case POINTER_PLUS_EXPR
:
4430 /* Any valid floating-point constants will have been folded by now;
4431 with -frounding-math we hit this with addition of two constants. */
4432 if (TREE_CODE (endtype
) == REAL_TYPE
)
4434 if (cache
&& cache
[0] == value
)
4436 if (! INTEGRAL_TYPE_P (endtype
)
4437 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4439 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4441 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4444 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4445 endtype
, ncache
+ 2);
4446 /* If either term is absolute, use the other term's relocation. */
4447 if (valid0
== null_pointer_node
)
4449 else if (valid1
== null_pointer_node
)
4451 /* Support narrowing pointer differences. */
4453 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4457 /* Support narrowing pointer differences. */
4458 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4467 if (TREE_CODE (endtype
) == REAL_TYPE
)
4469 if (cache
&& cache
[0] == value
)
4471 if (! INTEGRAL_TYPE_P (endtype
)
4472 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4474 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4476 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4479 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4480 endtype
, ncache
+ 2);
4481 /* Win if second argument is absolute. */
4482 if (valid1
== null_pointer_node
)
4484 /* Win if both arguments have the same relocation.
4485 Then the value is absolute. */
4486 else if (valid0
== valid1
&& valid0
!= 0)
4487 ret
= null_pointer_node
;
4488 /* Since GCC guarantees that string constants are unique in the
4489 generated code, a subtraction between two copies of the same
4490 constant string is absolute. */
4491 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4492 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4493 && operand_equal_p (valid0
, valid1
, 1))
4494 ret
= null_pointer_node
;
4495 /* Support narrowing differences. */
4497 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4501 /* Support narrowing differences. */
4502 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4517 /* Return nonzero if VALUE is a valid constant-valued expression
4518 for use in initializing a static variable; one that can be an
4519 element of a "constant" initializer.
4521 Return null_pointer_node if the value is absolute;
4522 if it is relocatable, return the variable that determines the relocation.
4523 We assume that VALUE has been folded as much as possible;
4524 therefore, we do not need to check for such things as
4525 arithmetic-combinations of integers. */
4527 initializer_constant_valid_p (tree value
, tree endtype
)
4529 return initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4532 /* Return true if VALUE is a valid constant-valued expression
4533 for use in initializing a static bit-field; one that can be
4534 an element of a "constant" initializer. */
4537 initializer_constant_valid_for_bitfield_p (tree value
)
4539 /* For bitfields we support integer constants or possibly nested aggregates
4541 switch (TREE_CODE (value
))
4545 unsigned HOST_WIDE_INT idx
;
4548 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4549 if (!initializer_constant_valid_for_bitfield_p (elt
))
4558 case VIEW_CONVERT_EXPR
:
4559 case NON_LVALUE_EXPR
:
4561 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4570 /* output_constructor outer state of relevance in recursive calls, typically
4571 for nested aggregate bitfields. */
4574 unsigned int bit_offset
; /* current position in ... */
4575 int byte
; /* ... the outer byte buffer. */
4578 static unsigned HOST_WIDE_INT
4579 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int,
4582 /* Output assembler code for constant EXP, with no label.
4583 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4584 Assumes output_addressed_constants has been done on EXP already.
4586 Generate exactly SIZE bytes of assembler data, padding at the end
4587 with zeros if necessary. SIZE must always be specified.
4589 SIZE is important for structure constructors,
4590 since trailing members may have been omitted from the constructor.
4591 It is also important for initialization of arrays from string constants
4592 since the full length of the string constant might not be wanted.
4593 It is also needed for initialization of unions, where the initializer's
4594 type is just one member, and that may not be as long as the union.
4596 There a case in which we would fail to output exactly SIZE bytes:
4597 for a structure constructor that wants to produce more than SIZE bytes.
4598 But such constructors will never be generated for any possible input.
4600 ALIGN is the alignment of the data in bits. */
4603 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4605 enum tree_code code
;
4606 unsigned HOST_WIDE_INT thissize
;
4608 if (size
== 0 || flag_syntax_only
)
4611 /* See if we're trying to initialize a pointer in a non-default mode
4612 to the address of some declaration somewhere. If the target says
4613 the mode is valid for pointers, assume the target has a way of
4615 if (TREE_CODE (exp
) == NOP_EXPR
4616 && POINTER_TYPE_P (TREE_TYPE (exp
))
4617 && targetm
.addr_space
.valid_pointer_mode
4618 (TYPE_MODE (TREE_TYPE (exp
)),
4619 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4621 tree saved_type
= TREE_TYPE (exp
);
4623 /* Peel off any intermediate conversions-to-pointer for valid
4625 while (TREE_CODE (exp
) == NOP_EXPR
4626 && POINTER_TYPE_P (TREE_TYPE (exp
))
4627 && targetm
.addr_space
.valid_pointer_mode
4628 (TYPE_MODE (TREE_TYPE (exp
)),
4629 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4630 exp
= TREE_OPERAND (exp
, 0);
4632 /* If what we're left with is the address of something, we can
4633 convert the address to the final type and output it that
4635 if (TREE_CODE (exp
) == ADDR_EXPR
)
4636 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4637 /* Likewise for constant ints. */
4638 else if (TREE_CODE (exp
) == INTEGER_CST
)
4639 exp
= wide_int_to_tree (saved_type
, exp
);
4643 /* Eliminate any conversions since we'll be outputting the underlying
4645 while (CONVERT_EXPR_P (exp
)
4646 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4647 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4649 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4650 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4652 /* Make sure eliminating the conversion is really a no-op, except with
4653 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4654 union types to allow for Ada unchecked unions. */
4655 if (type_size
> op_size
4656 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4657 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4658 /* Keep the conversion. */
4661 exp
= TREE_OPERAND (exp
, 0);
4664 code
= TREE_CODE (TREE_TYPE (exp
));
4665 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4667 /* Allow a constructor with no elements for any data type.
4668 This means to fill the space with zeros. */
4669 if (TREE_CODE (exp
) == CONSTRUCTOR
4670 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4672 assemble_zeros (size
);
4676 if (TREE_CODE (exp
) == FDESC_EXPR
)
4678 #ifdef ASM_OUTPUT_FDESC
4679 HOST_WIDE_INT part
= tree_to_shwi (TREE_OPERAND (exp
, 1));
4680 tree decl
= TREE_OPERAND (exp
, 0);
4681 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4688 /* Now output the underlying data. If we've handling the padding, return.
4689 Otherwise, break and ensure SIZE is the size written. */
4696 case REFERENCE_TYPE
:
4698 case FIXED_POINT_TYPE
:
4699 case POINTER_BOUNDS_TYPE
:
4701 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4702 EXPAND_INITIALIZER
),
4703 MIN (size
, thissize
), align
, 0))
4704 error ("initializer for integer/fixed-point value is too complicated");
4708 if (TREE_CODE (exp
) != REAL_CST
)
4709 error ("initializer for floating value is not a floating constant");
4711 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4715 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4716 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4717 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4722 switch (TREE_CODE (exp
))
4725 output_constructor (exp
, size
, align
, NULL
);
4729 = MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
), size
);
4730 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4734 enum machine_mode inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4735 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4736 int elt_size
= GET_MODE_SIZE (inner
);
4737 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
);
4738 thissize
= elt_size
;
4739 for (unsigned int i
= 1; i
< VECTOR_CST_NELTS (exp
); i
++)
4741 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
);
4742 thissize
+= elt_size
;
4753 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4754 output_constructor (exp
, size
, align
, NULL
);
4764 if (size
> thissize
)
4765 assemble_zeros (size
- thissize
);
4769 /* Subroutine of output_constructor, used for computing the size of
4770 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4771 type with an unspecified upper bound. */
4773 static unsigned HOST_WIDE_INT
4774 array_size_for_constructor (tree val
)
4777 unsigned HOST_WIDE_INT cnt
;
4778 tree index
, value
, tmp
;
4781 /* This code used to attempt to handle string constants that are not
4782 arrays of single-bytes, but nothing else does, so there's no point in
4784 if (TREE_CODE (val
) == STRING_CST
)
4785 return TREE_STRING_LENGTH (val
);
4787 max_index
= NULL_TREE
;
4788 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4790 if (TREE_CODE (index
) == RANGE_EXPR
)
4791 index
= TREE_OPERAND (index
, 1);
4792 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4796 if (max_index
== NULL_TREE
)
4799 /* Compute the total number of array elements. */
4800 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4801 i
= wi::to_offset (max_index
) - wi::to_offset (tmp
) + 1;
4803 /* Multiply by the array element unit size to find number of bytes. */
4804 i
*= wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4806 gcc_assert (wi::fits_uhwi_p (i
));
4807 return i
.to_uhwi ();
4810 /* Other datastructures + helpers for output_constructor. */
4812 /* output_constructor local state to support interaction with helpers. */
4816 /* Received arguments. */
4817 tree exp
; /* Constructor expression. */
4818 tree type
; /* Type of constructor expression. */
4819 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4820 unsigned int align
; /* Known initial alignment. */
4821 tree min_index
; /* Lower bound if specified for an array. */
4823 /* Output processing state. */
4824 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4825 int byte
; /* Part of a bitfield byte yet to be output. */
4826 int last_relative_index
; /* Implicit or explicit index of the last
4827 array element output within a bitfield. */
4828 bool byte_buffer_in_use
; /* Whether BYTE is in use. */
4830 /* Current element. */
4831 tree field
; /* Current field decl in a record. */
4832 tree val
; /* Current element value. */
4833 tree index
; /* Current element index. */
4837 /* Helper for output_constructor. From the current LOCAL state, output a
4838 RANGE_EXPR element. */
4841 output_constructor_array_range (oc_local_state
*local
)
4843 unsigned HOST_WIDE_INT fieldsize
4844 = int_size_in_bytes (TREE_TYPE (local
->type
));
4846 HOST_WIDE_INT lo_index
4847 = tree_to_shwi (TREE_OPERAND (local
->index
, 0));
4848 HOST_WIDE_INT hi_index
4849 = tree_to_shwi (TREE_OPERAND (local
->index
, 1));
4850 HOST_WIDE_INT index
;
4853 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4855 for (index
= lo_index
; index
<= hi_index
; index
++)
4857 /* Output the element's initial value. */
4858 if (local
->val
== NULL_TREE
)
4859 assemble_zeros (fieldsize
);
4861 output_constant (local
->val
, fieldsize
, align2
);
4863 /* Count its size. */
4864 local
->total_bytes
+= fieldsize
;
4868 /* Helper for output_constructor. From the current LOCAL state, output a
4869 field element that is not true bitfield or part of an outer one. */
4872 output_constructor_regular_field (oc_local_state
*local
)
4874 /* Field size and position. Since this structure is static, we know the
4875 positions are constant. */
4876 unsigned HOST_WIDE_INT fieldsize
;
4877 HOST_WIDE_INT fieldpos
;
4879 unsigned int align2
;
4881 if (local
->index
!= NULL_TREE
)
4883 /* Perform the index calculation in modulo arithmetic but
4884 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4885 but we are using an unsigned sizetype. */
4886 unsigned prec
= TYPE_PRECISION (sizetype
);
4887 offset_int idx
= wi::sext (wi::to_offset (local
->index
)
4888 - wi::to_offset (local
->min_index
), prec
);
4889 fieldpos
= (idx
* wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
))))
4892 else if (local
->field
!= NULL_TREE
)
4893 fieldpos
= int_byte_position (local
->field
);
4897 /* Output any buffered-up bit-fields preceding this element. */
4898 if (local
->byte_buffer_in_use
)
4900 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4901 local
->total_bytes
++;
4902 local
->byte_buffer_in_use
= false;
4905 /* Advance to offset of this element.
4906 Note no alignment needed in an array, since that is guaranteed
4907 if each element has the proper size. */
4908 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4909 && fieldpos
!= local
->total_bytes
)
4911 gcc_assert (fieldpos
>= local
->total_bytes
);
4912 assemble_zeros (fieldpos
- local
->total_bytes
);
4913 local
->total_bytes
= fieldpos
;
4916 /* Find the alignment of this element. */
4917 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
4919 /* Determine size this element should occupy. */
4924 /* If this is an array with an unspecified upper bound,
4925 the initializer determines the size. */
4926 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4927 but we cannot do this until the deprecated support for
4928 initializing zero-length array members is removed. */
4929 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
4930 && TYPE_DOMAIN (TREE_TYPE (local
->field
))
4931 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
))))
4933 fieldsize
= array_size_for_constructor (local
->val
);
4934 /* Given a non-empty initialization, this field had
4936 gcc_assert (!fieldsize
|| !DECL_CHAIN (local
->field
));
4939 fieldsize
= tree_to_uhwi (DECL_SIZE_UNIT (local
->field
));
4942 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
4944 /* Output the element's initial value. */
4945 if (local
->val
== NULL_TREE
)
4946 assemble_zeros (fieldsize
);
4948 output_constant (local
->val
, fieldsize
, align2
);
4950 /* Count its size. */
4951 local
->total_bytes
+= fieldsize
;
4954 /* Helper for output_constructor. From the LOCAL state, output an element
4955 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
4956 from the start of a possibly ongoing outer byte buffer. */
4959 output_constructor_bitfield (oc_local_state
*local
, unsigned int bit_offset
)
4961 /* Bit size of this element. */
4962 HOST_WIDE_INT ebitsize
4964 ? tree_to_uhwi (DECL_SIZE (local
->field
))
4965 : tree_to_uhwi (TYPE_SIZE (TREE_TYPE (local
->type
))));
4967 /* Relative index of this element if this is an array component. */
4968 HOST_WIDE_INT relative_index
4971 ? (tree_to_shwi (local
->index
)
4972 - tree_to_shwi (local
->min_index
))
4973 : local
->last_relative_index
+ 1)
4976 /* Bit position of this element from the start of the containing
4978 HOST_WIDE_INT constructor_relative_ebitpos
4980 ? int_bit_position (local
->field
)
4981 : ebitsize
* relative_index
);
4983 /* Bit position of this element from the start of a possibly ongoing
4984 outer byte buffer. */
4985 HOST_WIDE_INT byte_relative_ebitpos
4986 = bit_offset
+ constructor_relative_ebitpos
;
4988 /* From the start of a possibly ongoing outer byte buffer, offsets to
4989 the first bit of this element and to the first bit past the end of
4991 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
4992 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
4994 local
->last_relative_index
= relative_index
;
4996 if (local
->val
== NULL_TREE
)
4997 local
->val
= integer_zero_node
;
4999 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
5000 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
5001 local
->val
= TREE_OPERAND (local
->val
, 0);
5003 if (TREE_CODE (local
->val
) != INTEGER_CST
5004 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
5006 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
5010 /* If this field does not start in this (or next) byte, skip some bytes. */
5011 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5013 /* Output remnant of any bit field in previous bytes. */
5014 if (local
->byte_buffer_in_use
)
5016 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5017 local
->total_bytes
++;
5018 local
->byte_buffer_in_use
= false;
5021 /* If still not at proper byte, advance to there. */
5022 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5024 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
5025 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
5026 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
5030 /* Set up the buffer if necessary. */
5031 if (!local
->byte_buffer_in_use
)
5035 local
->byte_buffer_in_use
= true;
5038 /* If this is nested constructor, recurse passing the bit offset and the
5039 pending data, then retrieve the new pending data afterwards. */
5040 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
5042 oc_outer_state temp_state
;
5043 temp_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
5044 temp_state
.byte
= local
->byte
;
5046 += output_constructor (local
->val
, 0, 0, &temp_state
);
5047 local
->byte
= temp_state
.byte
;
5051 /* Otherwise, we must split the element into pieces that fall within
5052 separate bytes, and combine each byte with previous or following
5054 while (next_offset
< end_offset
)
5058 HOST_WIDE_INT value
;
5059 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
5060 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
5062 /* Advance from byte to byte within this element when necessary. */
5063 while (next_byte
!= local
->total_bytes
)
5065 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5066 local
->total_bytes
++;
5070 /* Number of bits we can process at once (all part of the same byte). */
5071 this_time
= MIN (end_offset
- next_offset
, BITS_PER_UNIT
- next_bit
);
5072 if (BYTES_BIG_ENDIAN
)
5074 /* On big-endian machine, take the most significant bits
5075 first (of the bits that are significant)
5076 and put them into bytes from the most significant end. */
5077 shift
= end_offset
- next_offset
- this_time
;
5079 /* Don't try to take a bunch of bits that cross
5080 the word boundary in the INTEGER_CST. We can
5081 only select bits from the LOW or HIGH part
5083 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5084 != ((shift
+ this_time
) / HOST_BITS_PER_WIDE_INT
))
5085 this_time
= (shift
+ this_time
) & (HOST_BITS_PER_WIDE_INT
- 1);
5087 /* Now get the bits from the appropriate constant word. */
5088 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5089 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5091 /* Get the result. This works only when:
5092 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5093 local
->byte
|= (((value
>> shift
)
5094 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5095 << (BITS_PER_UNIT
- this_time
- next_bit
));
5099 /* On little-endian machines,
5100 take first the least significant bits of the value
5101 and pack them starting at the least significant
5102 bits of the bytes. */
5103 shift
= next_offset
- byte_relative_ebitpos
;
5105 /* Don't try to take a bunch of bits that cross
5106 the word boundary in the INTEGER_CST. We can
5107 only select bits from the LOW or HIGH part
5109 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5110 != ((shift
+ this_time
) / HOST_BITS_PER_WIDE_INT
))
5111 this_time
= (HOST_BITS_PER_WIDE_INT
- shift
);
5113 /* Now get the bits from the appropriate constant word. */
5114 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5115 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5117 /* Get the result. This works only when:
5118 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5119 local
->byte
|= (((value
>> shift
)
5120 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5124 next_offset
+= this_time
;
5125 local
->byte_buffer_in_use
= true;
5129 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5130 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5131 caller output state of relevance in recursive invocations. */
5133 static unsigned HOST_WIDE_INT
5134 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
5135 unsigned int align
, oc_outer_state
*outer
)
5137 unsigned HOST_WIDE_INT cnt
;
5138 constructor_elt
*ce
;
5140 oc_local_state local
;
5142 /* Setup our local state to communicate with helpers. */
5144 local
.type
= TREE_TYPE (exp
);
5146 local
.align
= align
;
5147 if (TREE_CODE (local
.type
) == ARRAY_TYPE
&& TYPE_DOMAIN (local
.type
))
5148 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5150 local
.min_index
= NULL_TREE
;
5152 local
.total_bytes
= 0;
5153 local
.byte_buffer_in_use
= outer
!= NULL
;
5154 local
.byte
= outer
? outer
->byte
: 0;
5155 local
.last_relative_index
= -1;
5157 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5159 /* As CE goes through the elements of the constant, FIELD goes through the
5160 structure fields if the constant is a structure. If the constant is a
5161 union, we override this by getting the field from the TREE_LIST element.
5162 But the constant could also be an array. Then FIELD is zero.
5164 There is always a maximum of one element in the chain LINK for unions
5165 (even if the initializer in a source program incorrectly contains
5168 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5169 local
.field
= TYPE_FIELDS (local
.type
);
5171 local
.field
= NULL_TREE
;
5174 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5175 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5177 local
.val
= ce
->value
;
5178 local
.index
= NULL_TREE
;
5180 /* The element in a union constructor specifies the proper field
5182 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5183 local
.field
= ce
->index
;
5185 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5186 local
.index
= ce
->index
;
5188 if (local
.field
&& flag_verbose_asm
)
5189 fprintf (asm_out_file
, "%s %s:\n",
5191 DECL_NAME (local
.field
)
5192 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5195 /* Eliminate the marker that makes a cast not be an lvalue. */
5196 if (local
.val
!= NULL_TREE
)
5197 STRIP_NOPS (local
.val
);
5199 /* Output the current element, using the appropriate helper ... */
5201 /* For an array slice not part of an outer bitfield. */
5203 && local
.index
!= NULL_TREE
5204 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5205 output_constructor_array_range (&local
);
5207 /* For a field that is neither a true bitfield nor part of an outer one,
5208 known to be at least byte aligned and multiple-of-bytes long. */
5210 && (local
.field
== NULL_TREE
5211 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5212 output_constructor_regular_field (&local
);
5214 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5215 supported for scalar fields, so we may need to convert first. */
5218 if (TREE_CODE (local
.val
) == REAL_CST
)
5220 = fold_unary (VIEW_CONVERT_EXPR
,
5221 build_nonstandard_integer_type
5222 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5224 output_constructor_bitfield (&local
, outer
? outer
->bit_offset
: 0);
5228 /* If we are not at toplevel, save the pending data for our caller.
5229 Otherwise output the pending data and padding zeros as needed. */
5231 outer
->byte
= local
.byte
;
5234 if (local
.byte_buffer_in_use
)
5236 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5237 local
.total_bytes
++;
5240 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5242 assemble_zeros (local
.size
- local
.total_bytes
);
5243 local
.total_bytes
= local
.size
;
5247 return local
.total_bytes
;
5250 /* Mark DECL as weak. */
5253 mark_weak (tree decl
)
5255 DECL_WEAK (decl
) = 1;
5257 if (DECL_RTL_SET_P (decl
)
5258 && MEM_P (DECL_RTL (decl
))
5259 && XEXP (DECL_RTL (decl
), 0)
5260 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5261 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5264 /* Merge weak status between NEWDECL and OLDDECL. */
5267 merge_weak (tree newdecl
, tree olddecl
)
5269 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5271 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5274 /* We put the NEWDECL on the weak_decls list at some point
5275 and OLDDECL as well. Keep just OLDDECL on the list. */
5276 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5277 if (TREE_VALUE (*pwd
) == newdecl
)
5279 *pwd
= TREE_CHAIN (*pwd
);
5286 if (DECL_WEAK (newdecl
))
5290 /* NEWDECL is weak, but OLDDECL is not. */
5292 /* If we already output the OLDDECL, we're in trouble; we can't
5293 go back and make it weak. This should never happen in
5294 unit-at-a-time compilation. */
5295 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5297 /* If we've already generated rtl referencing OLDDECL, we may
5298 have done so in a way that will not function properly with
5299 a weak symbol. Again in unit-at-a-time this should be
5301 gcc_assert (!TREE_USED (olddecl
)
5302 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5304 if (TARGET_SUPPORTS_WEAK
)
5306 /* We put the NEWDECL on the weak_decls list at some point.
5307 Replace it with the OLDDECL. */
5308 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5309 if (TREE_VALUE (wd
) == newdecl
)
5311 TREE_VALUE (wd
) = olddecl
;
5314 /* We may not find the entry on the list. If NEWDECL is a
5315 weak alias, then we will have already called
5316 globalize_decl to remove the entry; in that case, we do
5317 not need to do anything. */
5320 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5321 mark_weak (olddecl
);
5324 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5325 weak. Just update NEWDECL to indicate that it's weak too. */
5326 mark_weak (newdecl
);
5329 /* Declare DECL to be a weak symbol. */
5332 declare_weak (tree decl
)
5334 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5335 if (! TREE_PUBLIC (decl
))
5336 error ("weak declaration of %q+D must be public", decl
);
5337 else if (!TARGET_SUPPORTS_WEAK
)
5338 warning (0, "weak declaration of %q+D not supported", decl
);
5341 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5342 DECL_ATTRIBUTES (decl
)
5343 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5347 weak_finish_1 (tree decl
)
5349 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5350 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5353 if (! TREE_USED (decl
))
5356 #ifdef ASM_WEAKEN_DECL
5357 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5359 #ifdef ASM_WEAKEN_LABEL
5360 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5362 #ifdef ASM_OUTPUT_WEAK_ALIAS
5364 static bool warn_once
= 0;
5367 warning (0, "only weak aliases are supported in this configuration");
5377 /* Fiven an assembly name, find the decl it is associated with. */
5379 find_decl (tree target
)
5381 symtab_node
*node
= symtab_node_for_asm (target
);
5387 /* This TREE_LIST contains weakref targets. */
5389 static GTY(()) tree weakref_targets
;
5391 /* Emit any pending weak declarations. */
5398 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5400 tree alias_decl
= TREE_PURPOSE (t
);
5401 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5403 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5404 /* Remove alias_decl from the weak list, but leave entries for
5405 the target alone. */
5407 #ifndef ASM_OUTPUT_WEAKREF
5408 else if (! TREE_SYMBOL_REFERENCED (target
))
5410 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5411 defined, otherwise we and weak_finish_1 would use
5412 different macros. */
5413 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5414 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5416 tree decl
= find_decl (target
);
5420 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5421 TREE_CODE (alias_decl
), target
,
5422 TREE_TYPE (alias_decl
));
5424 DECL_EXTERNAL (decl
) = 1;
5425 TREE_PUBLIC (decl
) = 1;
5426 DECL_ARTIFICIAL (decl
) = 1;
5427 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5428 TREE_USED (decl
) = 1;
5431 weak_finish_1 (decl
);
5440 /* Remove the alias and the target from the pending weak list
5441 so that we do not emit any .weak directives for the former,
5442 nor multiple .weak directives for the latter. */
5443 for (p
= &weak_decls
; (t2
= *p
) ; )
5445 if (TREE_VALUE (t2
) == alias_decl
5446 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5447 *p
= TREE_CHAIN (t2
);
5449 p
= &TREE_CHAIN (t2
);
5452 /* Remove other weakrefs to the same target, to speed things up. */
5453 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5455 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5456 *p
= TREE_CHAIN (t2
);
5458 p
= &TREE_CHAIN (t2
);
5463 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5465 tree decl
= TREE_VALUE (t
);
5467 weak_finish_1 (decl
);
5471 /* Emit the assembly bits to indicate that DECL is globally visible. */
5474 globalize_decl (tree decl
)
5477 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5478 if (DECL_WEAK (decl
))
5480 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5483 #ifdef ASM_WEAKEN_DECL
5484 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5486 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5489 /* Remove this function from the pending weak list so that
5490 we do not emit multiple .weak directives for it. */
5491 for (p
= &weak_decls
; (t
= *p
) ; )
5493 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5494 *p
= TREE_CHAIN (t
);
5496 p
= &TREE_CHAIN (t
);
5499 /* Remove weakrefs to the same target from the pending weakref
5500 list, for the same reason. */
5501 for (p
= &weakref_targets
; (t
= *p
) ; )
5503 if (DECL_ASSEMBLER_NAME (decl
)
5504 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5505 *p
= TREE_CHAIN (t
);
5507 p
= &TREE_CHAIN (t
);
5514 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5517 vec
<alias_pair
, va_gc
> *alias_pairs
;
5519 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5520 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5521 tree node is DECL to have the value of the tree node TARGET. */
5524 do_assemble_alias (tree decl
, tree target
)
5526 /* Emulated TLS had better not get this var. */
5527 gcc_assert (!(!targetm
.have_tls
5528 && TREE_CODE (decl
) == VAR_DECL
5529 && DECL_THREAD_LOCAL_P (decl
)));
5531 if (TREE_ASM_WRITTEN (decl
))
5534 /* We must force creation of DECL_RTL for debug info generation, even though
5535 we don't use it here. */
5536 make_decl_rtl (decl
);
5538 TREE_ASM_WRITTEN (decl
) = 1;
5539 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5541 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5543 ultimate_transparent_alias_target (&target
);
5545 if (!TREE_SYMBOL_REFERENCED (target
))
5546 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5548 #ifdef ASM_OUTPUT_WEAKREF
5549 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5550 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5551 IDENTIFIER_POINTER (target
));
5553 if (!TARGET_SUPPORTS_WEAK
)
5555 error_at (DECL_SOURCE_LOCATION (decl
),
5556 "weakref is not supported in this configuration");
5563 #ifdef ASM_OUTPUT_DEF
5564 /* Make name accessible from other files, if appropriate. */
5566 if (TREE_PUBLIC (decl
))
5568 globalize_decl (decl
);
5569 maybe_assemble_visibility (decl
);
5571 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5573 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5574 if (targetm
.has_ifunc_p ())
5575 ASM_OUTPUT_TYPE_DIRECTIVE
5576 (asm_out_file
, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5580 error_at (DECL_SOURCE_LOCATION (decl
),
5581 "ifunc is not supported on this target");
5584 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5585 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5587 ASM_OUTPUT_DEF (asm_out_file
,
5588 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5589 IDENTIFIER_POINTER (target
));
5591 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5596 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5597 # ifdef ASM_WEAKEN_DECL
5598 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5600 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5602 /* Remove this function from the pending weak list so that
5603 we do not emit multiple .weak directives for it. */
5604 for (p
= &weak_decls
; (t
= *p
) ; )
5605 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5606 *p
= TREE_CHAIN (t
);
5608 p
= &TREE_CHAIN (t
);
5610 /* Remove weakrefs to the same target from the pending weakref
5611 list, for the same reason. */
5612 for (p
= &weakref_targets
; (t
= *p
) ; )
5614 if (DECL_ASSEMBLER_NAME (decl
)
5615 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5616 *p
= TREE_CHAIN (t
);
5618 p
= &TREE_CHAIN (t
);
5624 /* Emit an assembler directive to make the symbol for DECL an alias to
5625 the symbol for TARGET. */
5628 assemble_alias (tree decl
, tree target
)
5632 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5634 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5636 ultimate_transparent_alias_target (&target
);
5638 if (alias
== target
)
5639 error ("weakref %q+D ultimately targets itself", decl
);
5640 if (TREE_PUBLIC (decl
))
5641 error ("weakref %q+D must have static linkage", decl
);
5645 #if !defined (ASM_OUTPUT_DEF)
5646 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5647 error_at (DECL_SOURCE_LOCATION (decl
),
5648 "alias definitions not supported in this configuration");
5651 if (!DECL_WEAK (decl
))
5653 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5654 error_at (DECL_SOURCE_LOCATION (decl
),
5655 "ifunc is not supported in this configuration");
5657 error_at (DECL_SOURCE_LOCATION (decl
),
5658 "only weak aliases are supported in this configuration");
5664 TREE_USED (decl
) = 1;
5666 /* Allow aliases to aliases. */
5667 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5668 cgraph_get_create_node (decl
)->alias
= true;
5670 varpool_node_for_decl (decl
)->alias
= true;
5672 /* If the target has already been emitted, we don't have to queue the
5673 alias. This saves a tad of memory. */
5674 if (cgraph_global_info_ready
)
5675 target_decl
= find_decl (target
);
5678 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5679 || cgraph_state
>= CGRAPH_STATE_EXPANSION
)
5680 do_assemble_alias (decl
, target
);
5683 alias_pair p
= {decl
, target
};
5684 vec_safe_push (alias_pairs
, p
);
5688 /* Record and output a table of translations from original function
5689 to its transaction aware clone. Note that tm_pure functions are
5690 considered to be their own clone. */
5692 static GTY((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
5693 htab_t tm_clone_hash
;
5696 record_tm_clone_pair (tree o
, tree n
)
5698 struct tree_map
**slot
, *h
;
5700 if (tm_clone_hash
== NULL
)
5701 tm_clone_hash
= htab_create_ggc (32, tree_map_hash
, tree_map_eq
, 0);
5703 h
= ggc_alloc_tree_map ();
5704 h
->hash
= htab_hash_pointer (o
);
5708 slot
= (struct tree_map
**)
5709 htab_find_slot_with_hash (tm_clone_hash
, h
, h
->hash
, INSERT
);
5714 get_tm_clone_pair (tree o
)
5718 struct tree_map
*h
, in
;
5721 in
.hash
= htab_hash_pointer (o
);
5722 h
= (struct tree_map
*) htab_find_with_hash (tm_clone_hash
,
5730 typedef struct tm_alias_pair
5738 /* Helper function for finish_tm_clone_pairs. Dump a hash table entry
5739 into a VEC in INFO. */
5742 dump_tm_clone_to_vec (void **slot
, void *info
)
5744 struct tree_map
*map
= (struct tree_map
*) *slot
;
5745 vec
<tm_alias_pair
> *tm_alias_pairs
= (vec
<tm_alias_pair
> *) info
;
5746 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5747 tm_alias_pairs
->safe_push (p
);
5751 /* Dump the actual pairs to the .tm_clone_table section. */
5754 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5758 bool switched
= false;
5760 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5764 struct cgraph_node
*src_n
= cgraph_get_node (src
);
5765 struct cgraph_node
*dst_n
= cgraph_get_node (dst
);
5767 /* The function ipa_tm_create_version() marks the clone as needed if
5768 the original function was needed. But we also mark the clone as
5769 needed if we ever called the clone indirectly through
5770 TM_GETTMCLONE. If neither of these are true, we didn't generate
5771 a clone, and we didn't call it indirectly... no sense keeping it
5772 in the clone table. */
5773 if (!dst_n
|| !dst_n
->definition
)
5776 /* This covers the case where we have optimized the original
5777 function away, and only access the transactional clone. */
5778 if (!src_n
|| !src_n
->definition
)
5783 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5784 assemble_align (POINTER_SIZE
);
5788 assemble_integer (XEXP (DECL_RTL (src
), 0),
5789 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5790 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5791 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5795 /* Provide a default for the tm_clone_table section. */
5798 default_clone_table_section (void)
5800 return get_named_section (NULL
, ".tm_clone_table", 3);
5803 /* Helper comparison function for qsorting by the DECL_UID stored in
5804 alias_pair->emitted_diags. */
5807 tm_alias_pair_cmp (const void *x
, const void *y
)
5809 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5810 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5811 if (p1
->uid
< p2
->uid
)
5813 if (p1
->uid
> p2
->uid
)
5819 finish_tm_clone_pairs (void)
5821 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5823 if (tm_clone_hash
== NULL
)
5826 /* We need a determenistic order for the .tm_clone_table, otherwise
5827 we will get bootstrap comparison failures, so dump the hash table
5828 to a vector, sort it, and dump the vector. */
5830 /* Dump the hashtable to a vector. */
5831 htab_traverse_noresize (tm_clone_hash
, dump_tm_clone_to_vec
,
5832 (void *) &tm_alias_pairs
);
5834 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5837 dump_tm_clone_pairs (tm_alias_pairs
);
5839 htab_delete (tm_clone_hash
);
5840 tm_clone_hash
= NULL
;
5841 tm_alias_pairs
.release ();
5845 /* Emit an assembler directive to set symbol for DECL visibility to
5846 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5849 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5850 int vis ATTRIBUTE_UNUSED
)
5852 #ifdef HAVE_GAS_HIDDEN
5853 static const char * const visibility_types
[] = {
5854 NULL
, "protected", "hidden", "internal"
5857 const char *name
, *type
;
5859 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5860 type
= visibility_types
[vis
];
5862 fprintf (asm_out_file
, "\t.%s\t", type
);
5863 assemble_name (asm_out_file
, name
);
5864 fprintf (asm_out_file
, "\n");
5866 if (!DECL_ARTIFICIAL (decl
))
5867 warning (OPT_Wattributes
, "visibility attribute not supported "
5868 "in this configuration; ignored");
5872 /* A helper function to call assemble_visibility when needed for a decl. */
5875 maybe_assemble_visibility (tree decl
)
5877 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5879 if (vis
!= VISIBILITY_DEFAULT
)
5881 targetm
.asm_out
.assemble_visibility (decl
, vis
);
5888 /* Returns 1 if the target configuration supports defining public symbols
5889 so that one of them will be chosen at link time instead of generating a
5890 multiply-defined symbol error, whether through the use of weak symbols or
5891 a target-specific mechanism for having duplicates discarded. */
5894 supports_one_only (void)
5896 if (SUPPORTS_ONE_ONLY
)
5898 return TARGET_SUPPORTS_WEAK
;
5901 /* Set up DECL as a public symbol that can be defined in multiple
5902 translation units without generating a linker error. */
5905 make_decl_one_only (tree decl
, tree comdat_group
)
5907 gcc_assert (TREE_CODE (decl
) == VAR_DECL
5908 || TREE_CODE (decl
) == FUNCTION_DECL
);
5910 TREE_PUBLIC (decl
) = 1;
5912 if (SUPPORTS_ONE_ONLY
)
5914 #ifdef MAKE_DECL_ONE_ONLY
5915 MAKE_DECL_ONE_ONLY (decl
);
5917 DECL_COMDAT_GROUP (decl
) = comdat_group
;
5919 else if (TREE_CODE (decl
) == VAR_DECL
5920 && (DECL_INITIAL (decl
) == 0 || DECL_INITIAL (decl
) == error_mark_node
))
5921 DECL_COMMON (decl
) = 1;
5924 gcc_assert (TARGET_SUPPORTS_WEAK
);
5925 DECL_WEAK (decl
) = 1;
5930 init_varasm_once (void)
5932 section_htab
= htab_create_ggc (31, section_entry_hash
,
5933 section_entry_eq
, NULL
);
5934 object_block_htab
= htab_create_ggc (31, object_block_entry_hash
,
5935 object_block_entry_eq
, NULL
);
5936 const_desc_htab
= htab_create_ggc (1009, const_desc_hash
,
5937 const_desc_eq
, NULL
);
5939 const_alias_set
= new_alias_set ();
5940 shared_constant_pool
= create_constant_pool ();
5942 #ifdef TEXT_SECTION_ASM_OP
5943 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
5944 TEXT_SECTION_ASM_OP
);
5947 #ifdef DATA_SECTION_ASM_OP
5948 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5949 DATA_SECTION_ASM_OP
);
5952 #ifdef SDATA_SECTION_ASM_OP
5953 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5954 SDATA_SECTION_ASM_OP
);
5957 #ifdef READONLY_DATA_SECTION_ASM_OP
5958 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
5959 READONLY_DATA_SECTION_ASM_OP
);
5962 #ifdef CTORS_SECTION_ASM_OP
5963 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
5964 CTORS_SECTION_ASM_OP
);
5967 #ifdef DTORS_SECTION_ASM_OP
5968 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
5969 DTORS_SECTION_ASM_OP
);
5972 #ifdef BSS_SECTION_ASM_OP
5973 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5974 output_section_asm_op
,
5975 BSS_SECTION_ASM_OP
);
5978 #ifdef SBSS_SECTION_ASM_OP
5979 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5980 output_section_asm_op
,
5981 SBSS_SECTION_ASM_OP
);
5984 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5985 | SECTION_COMMON
, emit_tls_common
);
5986 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5987 | SECTION_COMMON
, emit_local
);
5988 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5989 | SECTION_COMMON
, emit_common
);
5991 #if defined ASM_OUTPUT_ALIGNED_BSS
5992 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
5996 targetm
.asm_out
.init_sections ();
5998 if (readonly_data_section
== NULL
)
5999 readonly_data_section
= text_section
;
6001 #ifdef ASM_OUTPUT_EXTERNAL
6002 pending_assemble_externals_set
= pointer_set_create ();
6007 decl_default_tls_model (const_tree decl
)
6009 enum tls_model kind
;
6012 is_local
= targetm
.binds_local_p (decl
);
6016 kind
= TLS_MODEL_LOCAL_EXEC
;
6018 kind
= TLS_MODEL_INITIAL_EXEC
;
6021 /* Local dynamic is inefficient when we're not combining the
6022 parts of the address. */
6023 else if (optimize
&& is_local
)
6024 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
6026 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
6027 if (kind
< flag_tls_default
)
6028 kind
= flag_tls_default
;
6033 /* Select a set of attributes for section NAME based on the properties
6034 of DECL and whether or not RELOC indicates that DECL's initializer
6035 might contain runtime relocations.
6037 We make the section read-only and executable for a function decl,
6038 read-only for a const data decl, and writable for a non-const data decl. */
6041 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6045 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6046 flags
= SECTION_CODE
;
6049 enum section_category category
6050 = categorize_decl_for_section (decl
, reloc
);
6051 if (decl_readonly_section_1 (category
))
6053 else if (category
== SECCAT_DATA_REL_RO
6054 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6055 flags
= SECTION_WRITE
| SECTION_RELRO
;
6057 flags
= SECTION_WRITE
;
6061 flags
= SECTION_WRITE
;
6062 if (strcmp (name
, ".data.rel.ro") == 0
6063 || strcmp (name
, ".data.rel.ro.local") == 0)
6064 flags
|= SECTION_RELRO
;
6067 if (decl
&& DECL_P (decl
) && DECL_ONE_ONLY (decl
))
6068 flags
|= SECTION_LINKONCE
;
6070 if (strcmp (name
, ".vtable_map_vars") == 0)
6071 flags
|= SECTION_LINKONCE
;
6073 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6074 flags
|= SECTION_TLS
| SECTION_WRITE
;
6076 if (strcmp (name
, ".bss") == 0
6077 || strncmp (name
, ".bss.", 5) == 0
6078 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6079 || strcmp (name
, ".sbss") == 0
6080 || strncmp (name
, ".sbss.", 6) == 0
6081 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6082 flags
|= SECTION_BSS
;
6084 if (strcmp (name
, ".tdata") == 0
6085 || strncmp (name
, ".tdata.", 7) == 0
6086 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6087 flags
|= SECTION_TLS
;
6089 if (strcmp (name
, ".tbss") == 0
6090 || strncmp (name
, ".tbss.", 6) == 0
6091 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6092 flags
|= SECTION_TLS
| SECTION_BSS
;
6094 /* These three sections have special ELF types. They are neither
6095 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6096 want to print a section type (@progbits or @nobits). If someone
6097 is silly enough to emit code or TLS variables to one of these
6098 sections, then don't handle them specially. */
6099 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6100 && (strcmp (name
, ".init_array") == 0
6101 || strcmp (name
, ".fini_array") == 0
6102 || strcmp (name
, ".preinit_array") == 0))
6103 flags
|= SECTION_NOTYPE
;
6108 /* Return true if the target supports some form of global BSS,
6109 either through bss_noswitch_section, or by selecting a BSS
6110 section in TARGET_ASM_SELECT_SECTION. */
6113 have_global_bss_p (void)
6115 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6118 /* Output assembly to switch to section NAME with attribute FLAGS.
6119 Four variants for common object file formats. */
6122 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6123 unsigned int flags ATTRIBUTE_UNUSED
,
6124 tree decl ATTRIBUTE_UNUSED
)
6126 /* Some object formats don't support named sections at all. The
6127 front-end should already have flagged this as an error. */
6131 #ifndef TLS_SECTION_ASM_FLAG
6132 #define TLS_SECTION_ASM_FLAG 'T'
6136 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6137 tree decl ATTRIBUTE_UNUSED
)
6139 char flagchars
[10], *f
= flagchars
;
6141 /* If we have already declared this section, we can use an
6142 abbreviated form to switch back to it -- unless this section is
6143 part of a COMDAT groups, in which case GAS requires the full
6144 declaration every time. */
6145 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6146 && (flags
& SECTION_DECLARED
))
6148 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6152 if (!(flags
& SECTION_DEBUG
))
6154 if (flags
& SECTION_EXCLUDE
)
6156 if (flags
& SECTION_WRITE
)
6158 if (flags
& SECTION_CODE
)
6160 if (flags
& SECTION_SMALL
)
6162 if (flags
& SECTION_MERGE
)
6164 if (flags
& SECTION_STRINGS
)
6166 if (flags
& SECTION_TLS
)
6167 *f
++ = TLS_SECTION_ASM_FLAG
;
6168 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6172 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6174 if (!(flags
& SECTION_NOTYPE
))
6179 if (flags
& SECTION_BSS
)
6185 /* On platforms that use "@" as the assembly comment character,
6187 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6189 fprintf (asm_out_file
, format
, type
);
6191 if (flags
& SECTION_ENTSIZE
)
6192 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6193 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6195 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6196 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6198 fprintf (asm_out_file
, ",%s,comdat",
6199 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6203 putc ('\n', asm_out_file
);
6207 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6208 tree decl ATTRIBUTE_UNUSED
)
6210 char flagchars
[8], *f
= flagchars
;
6212 if (flags
& SECTION_WRITE
)
6214 if (flags
& SECTION_CODE
)
6218 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6222 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6225 default_coff_asm_named_section (name
, flags
, decl
);
6227 if (flags
& SECTION_LINKONCE
)
6229 /* Functions may have been compiled at various levels of
6230 optimization so we can't use `same_size' here.
6231 Instead, have the linker pick one. */
6232 fprintf (asm_out_file
, "\t.linkonce %s\n",
6233 (flags
& SECTION_CODE
? "discard" : "same_size"));
6237 /* The lame default section selector. */
6240 default_select_section (tree decl
, int reloc
,
6241 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6245 if (decl_readonly_section (decl
, reloc
))
6246 return readonly_data_section
;
6248 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6250 if (! ((flag_pic
&& reloc
)
6251 || !TREE_READONLY (decl
)
6252 || TREE_SIDE_EFFECTS (decl
)
6253 || !TREE_CONSTANT (decl
)))
6254 return readonly_data_section
;
6256 else if (TREE_CODE (decl
) == STRING_CST
)
6257 return readonly_data_section
;
6258 else if (! (flag_pic
&& reloc
))
6259 return readonly_data_section
;
6261 return data_section
;
6264 enum section_category
6265 categorize_decl_for_section (const_tree decl
, int reloc
)
6267 enum section_category ret
;
6269 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6271 else if (TREE_CODE (decl
) == STRING_CST
)
6273 if ((flag_sanitize
& SANITIZE_ADDRESS
)
6274 && asan_protect_global (CONST_CAST_TREE (decl
)))
6275 /* or !flag_merge_constants */
6276 return SECCAT_RODATA
;
6278 return SECCAT_RODATA_MERGE_STR
;
6280 else if (TREE_CODE (decl
) == VAR_DECL
)
6282 if (bss_initializer_p (decl
))
6284 else if (! TREE_READONLY (decl
)
6285 || TREE_SIDE_EFFECTS (decl
)
6286 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6288 /* Here the reloc_rw_mask is not testing whether the section should
6289 be read-only or not, but whether the dynamic link will have to
6290 do something. If so, we wish to segregate the data in order to
6291 minimize cache misses inside the dynamic linker. */
6292 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6293 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6297 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6298 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6299 else if (reloc
|| flag_merge_constants
< 2
6300 || ((flag_sanitize
& SANITIZE_ADDRESS
)
6301 && asan_protect_global (CONST_CAST_TREE (decl
))))
6302 /* C and C++ don't allow different variables to share the same
6303 location. -fmerge-all-constants allows even that (at the
6304 expense of not conforming). */
6305 ret
= SECCAT_RODATA
;
6306 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6307 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6309 ret
= SECCAT_RODATA_MERGE_CONST
;
6311 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6313 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6314 || TREE_SIDE_EFFECTS (decl
)
6315 || ! TREE_CONSTANT (decl
))
6318 ret
= SECCAT_RODATA
;
6321 ret
= SECCAT_RODATA
;
6323 /* There are no read-only thread-local sections. */
6324 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6326 /* Note that this would be *just* SECCAT_BSS, except that there's
6327 no concept of a read-only thread-local-data section. */
6328 if (ret
== SECCAT_BSS
6329 || (flag_zero_initialized_in_bss
6330 && initializer_zerop (DECL_INITIAL (decl
))))
6336 /* If the target uses small data sections, select it. */
6337 else if (targetm
.in_small_data_p (decl
))
6339 if (ret
== SECCAT_BSS
)
6341 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6342 ret
= SECCAT_SRODATA
;
6351 decl_readonly_section_1 (enum section_category category
)
6356 case SECCAT_RODATA_MERGE_STR
:
6357 case SECCAT_RODATA_MERGE_STR_INIT
:
6358 case SECCAT_RODATA_MERGE_CONST
:
6359 case SECCAT_SRODATA
:
6367 decl_readonly_section (const_tree decl
, int reloc
)
6369 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6372 /* Select a section based on the above categorization. */
6375 default_elf_select_section (tree decl
, int reloc
,
6376 unsigned HOST_WIDE_INT align
)
6379 switch (categorize_decl_for_section (decl
, reloc
))
6382 /* We're not supposed to be called on FUNCTION_DECLs. */
6385 return readonly_data_section
;
6386 case SECCAT_RODATA_MERGE_STR
:
6387 return mergeable_string_section (decl
, align
, 0);
6388 case SECCAT_RODATA_MERGE_STR_INIT
:
6389 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6390 case SECCAT_RODATA_MERGE_CONST
:
6391 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6392 case SECCAT_SRODATA
:
6396 return data_section
;
6397 case SECCAT_DATA_REL
:
6398 sname
= ".data.rel";
6400 case SECCAT_DATA_REL_LOCAL
:
6401 sname
= ".data.rel.local";
6403 case SECCAT_DATA_REL_RO
:
6404 sname
= ".data.rel.ro";
6406 case SECCAT_DATA_REL_RO_LOCAL
:
6407 sname
= ".data.rel.ro.local";
6430 return get_named_section (decl
, sname
, reloc
);
6433 /* Construct a unique section name based on the decl name and the
6434 categorization performed above. */
6437 default_unique_section (tree decl
, int reloc
)
6439 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6440 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6441 const char *prefix
, *name
, *linkonce
;
6444 switch (categorize_decl_for_section (decl
, reloc
))
6447 prefix
= one_only
? ".t" : ".text";
6450 case SECCAT_RODATA_MERGE_STR
:
6451 case SECCAT_RODATA_MERGE_STR_INIT
:
6452 case SECCAT_RODATA_MERGE_CONST
:
6453 prefix
= one_only
? ".r" : ".rodata";
6455 case SECCAT_SRODATA
:
6456 prefix
= one_only
? ".s2" : ".sdata2";
6459 prefix
= one_only
? ".d" : ".data";
6461 case SECCAT_DATA_REL
:
6462 prefix
= one_only
? ".d.rel" : ".data.rel";
6464 case SECCAT_DATA_REL_LOCAL
:
6465 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6467 case SECCAT_DATA_REL_RO
:
6468 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6470 case SECCAT_DATA_REL_RO_LOCAL
:
6471 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6474 prefix
= one_only
? ".s" : ".sdata";
6477 prefix
= one_only
? ".b" : ".bss";
6480 prefix
= one_only
? ".sb" : ".sbss";
6483 prefix
= one_only
? ".td" : ".tdata";
6486 prefix
= one_only
? ".tb" : ".tbss";
6492 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
6493 name
= targetm
.strip_name_encoding (name
);
6495 /* If we're using one_only, then there needs to be a .gnu.linkonce
6496 prefix to the section name. */
6497 linkonce
= one_only
? ".gnu.linkonce" : "";
6499 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6501 DECL_SECTION_NAME (decl
) = build_string (strlen (string
), string
);
6504 /* Like compute_reloc_for_constant, except for an RTX. The return value
6505 is a mask for which bit 1 indicates a global relocation, and bit 0
6506 indicates a local relocation. */
6509 compute_reloc_for_rtx_1 (rtx
*xp
, void *data
)
6511 int *preloc
= (int *) data
;
6514 switch (GET_CODE (x
))
6517 *preloc
|= SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6530 compute_reloc_for_rtx (rtx x
)
6534 switch (GET_CODE (x
))
6540 for_each_rtx (&x
, compute_reloc_for_rtx_1
, &reloc
);
6549 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
6551 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6553 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6554 return data_section
;
6556 return readonly_data_section
;
6560 default_elf_select_rtx_section (enum machine_mode mode
, rtx x
,
6561 unsigned HOST_WIDE_INT align
)
6563 int reloc
= compute_reloc_for_rtx (x
);
6565 /* ??? Handle small data here somehow. */
6567 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6570 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6572 return get_named_section (NULL
, ".data.rel.ro", 3);
6575 return mergeable_constant_section (mode
, align
, 0);
6578 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6581 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6586 /* Careful not to prod global register variables. */
6589 symbol
= XEXP (rtl
, 0);
6590 if (GET_CODE (symbol
) != SYMBOL_REF
)
6593 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6594 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6595 flags
|= SYMBOL_FLAG_FUNCTION
;
6596 if (targetm
.binds_local_p (decl
))
6597 flags
|= SYMBOL_FLAG_LOCAL
;
6598 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6599 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6600 else if (targetm
.in_small_data_p (decl
))
6601 flags
|= SYMBOL_FLAG_SMALL
;
6602 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6603 being PUBLIC, the thing *must* be defined in this translation unit.
6604 Prevent this buglet from being propagated into rtl code as well. */
6605 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6606 flags
|= SYMBOL_FLAG_EXTERNAL
;
6608 SYMBOL_REF_FLAGS (symbol
) = flags
;
6611 /* By default, we do nothing for encode_section_info, so we need not
6612 do anything but discard the '*' marker. */
6615 default_strip_name_encoding (const char *str
)
6617 return str
+ (*str
== '*');
6620 #ifdef ASM_OUTPUT_DEF
6621 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6622 anchor relative to ".", the current section position. */
6625 default_asm_output_anchor (rtx symbol
)
6629 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6630 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6631 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6635 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6638 default_use_anchors_for_symbol_p (const_rtx symbol
)
6643 /* Don't use anchors for mergeable sections. The linker might move
6644 the objects around. */
6645 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6646 if (sect
->common
.flags
& SECTION_MERGE
)
6649 /* Don't use anchors for small data sections. The small data register
6650 acts as an anchor for such sections. */
6651 if (sect
->common
.flags
& SECTION_SMALL
)
6654 decl
= SYMBOL_REF_DECL (symbol
);
6655 if (decl
&& DECL_P (decl
))
6657 /* Don't use section anchors for decls that might be defined or
6658 usurped by other modules. */
6659 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
6662 /* Don't use section anchors for decls that will be placed in a
6663 small data section. */
6664 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6665 one above. The problem is that we only use SECTION_SMALL for
6666 sections that should be marked as small in the section directive. */
6667 if (targetm
.in_small_data_p (decl
))
6673 /* Return true when RESOLUTION indicate that symbol will be bound to the
6674 definition provided by current .o file. */
6677 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6679 return (resolution
== LDPR_PREVAILING_DEF
6680 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6681 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6684 /* Return true when RESOLUTION indicate that symbol will be bound locally
6685 within current executable or DSO. */
6688 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6690 return (resolution
== LDPR_PREVAILING_DEF
6691 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6692 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6693 || resolution
== LDPR_PREEMPTED_REG
6694 || resolution
== LDPR_PREEMPTED_IR
6695 || resolution
== LDPR_RESOLVED_IR
6696 || resolution
== LDPR_RESOLVED_EXEC
);
6699 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6700 wrt cross-module name binding. */
6703 default_binds_local_p (const_tree exp
)
6705 return default_binds_local_p_1 (exp
, flag_shlib
);
6709 default_binds_local_p_1 (const_tree exp
, int shlib
)
6712 bool resolved_locally
= false;
6713 bool resolved_to_local_def
= false;
6715 /* With resolution file in hands, take look into resolutions.
6716 We can't just return true for resolved_locally symbols,
6717 because dynamic linking might overwrite symbols
6718 in shared libraries. */
6719 if (TREE_CODE (exp
) == VAR_DECL
&& TREE_PUBLIC (exp
)
6720 && (TREE_STATIC (exp
) || DECL_EXTERNAL (exp
)))
6722 struct varpool_node
*vnode
= varpool_get_node (exp
);
6723 if (vnode
&& resolution_local_p (vnode
->resolution
))
6724 resolved_locally
= true;
6726 && resolution_to_local_definition_p (vnode
->resolution
))
6727 resolved_to_local_def
= true;
6729 else if (TREE_CODE (exp
) == FUNCTION_DECL
&& TREE_PUBLIC (exp
))
6731 struct cgraph_node
*node
= cgraph_get_node (exp
);
6733 && resolution_local_p (node
->resolution
))
6734 resolved_locally
= true;
6736 && resolution_to_local_definition_p (node
->resolution
))
6737 resolved_to_local_def
= true;
6740 /* A non-decl is an entry in the constant pool. */
6743 /* Weakrefs may not bind locally, even though the weakref itself is always
6744 static and therefore local. Similarly, the resolver for ifunc functions
6745 might resolve to a non-local function.
6746 FIXME: We can resolve the weakref case more curefuly by looking at the
6748 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6749 || (TREE_CODE (exp
) == FUNCTION_DECL
6750 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6752 /* Static variables are always local. */
6753 else if (! TREE_PUBLIC (exp
))
6755 /* A variable is local if the user has said explicitly that it will
6757 else if ((DECL_VISIBILITY_SPECIFIED (exp
)
6758 || resolved_to_local_def
)
6759 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6761 /* Variables defined outside this object might not be local. */
6762 else if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6764 /* If defined in this object and visibility is not default, must be
6766 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6768 /* Default visibility weak data can be overridden by a strong symbol
6769 in another module and so are not local. */
6770 else if (DECL_WEAK (exp
)
6771 && !resolved_locally
)
6773 /* If PIC, then assume that any global name can be overridden by
6774 symbols resolved from other modules. */
6777 /* Uninitialized COMMON variable may be unified with symbols
6778 resolved from other modules. */
6779 else if (DECL_COMMON (exp
)
6780 && !resolved_locally
6781 && (DECL_INITIAL (exp
) == NULL
6782 || DECL_INITIAL (exp
) == error_mark_node
))
6784 /* Otherwise we're left with initialized (or non-common) global data
6785 which is of necessity defined locally. */
6792 /* Return true when references to DECL must bind to current definition in
6795 The condition is usually equivalent to whether the function binds to the
6796 current module (shared library or executable), that is to binds_local_p.
6797 We use this fact to avoid need for another target hook and implement
6798 the logic using binds_local_p and just special cases where
6799 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6800 the weak definitions (that can be overwritten at linktime by other
6801 definition from different object file) and when resolution info is available
6802 we simply use the knowledge passed to us by linker plugin. */
6804 decl_binds_to_current_def_p (tree decl
)
6806 gcc_assert (DECL_P (decl
));
6807 if (!targetm
.binds_local_p (decl
))
6809 if (!TREE_PUBLIC (decl
))
6811 /* When resolution is available, just use it. */
6812 if (TREE_CODE (decl
) == VAR_DECL
6813 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)))
6815 struct varpool_node
*vnode
= varpool_get_node (decl
);
6817 && vnode
->resolution
!= LDPR_UNKNOWN
)
6818 return resolution_to_local_definition_p (vnode
->resolution
);
6820 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
6822 struct cgraph_node
*node
= cgraph_get_node (decl
);
6824 && node
->resolution
!= LDPR_UNKNOWN
)
6825 return resolution_to_local_definition_p (node
->resolution
);
6827 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6828 binds locally but still can be overwritten), DECL_COMMON (can be merged
6829 with a non-common definition somewhere in the same module) or
6831 This rely on fact that binds_local_p behave as decl_replaceable_p
6832 for all other declaration types. */
6833 if (DECL_WEAK (decl
))
6835 if (DECL_COMMON (decl
)
6836 && (DECL_INITIAL (decl
) == NULL
6837 || DECL_INITIAL (decl
) == error_mark_node
))
6839 if (DECL_EXTERNAL (decl
))
6844 /* A replaceable function or variable is one which may be replaced
6845 at link-time with an entirely different definition, provided that the
6846 replacement has the same type. For example, functions declared
6847 with __attribute__((weak)) on most systems are replaceable.
6849 COMDAT functions are not replaceable, since all definitions of the
6850 function must be equivalent. It is important that COMDAT functions
6851 not be treated as replaceable so that use of C++ template
6852 instantiations is not penalized. */
6855 decl_replaceable_p (tree decl
)
6857 gcc_assert (DECL_P (decl
));
6858 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
6860 return !decl_binds_to_current_def_p (decl
);
6863 /* Default function to output code that will globalize a label. A
6864 target must define GLOBAL_ASM_OP or provide its own function to
6865 globalize a label. */
6866 #ifdef GLOBAL_ASM_OP
6868 default_globalize_label (FILE * stream
, const char *name
)
6870 fputs (GLOBAL_ASM_OP
, stream
);
6871 assemble_name (stream
, name
);
6872 putc ('\n', stream
);
6874 #endif /* GLOBAL_ASM_OP */
6876 /* Default function to output code that will globalize a declaration. */
6878 default_globalize_decl_name (FILE * stream
, tree decl
)
6880 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6881 targetm
.asm_out
.globalize_label (stream
, name
);
6884 /* Default function to output a label for unwind information. The
6885 default is to do nothing. A target that needs nonlocal labels for
6886 unwind information must provide its own function to do this. */
6888 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6889 tree decl ATTRIBUTE_UNUSED
,
6890 int for_eh ATTRIBUTE_UNUSED
,
6891 int empty ATTRIBUTE_UNUSED
)
6895 /* Default function to output a label to divide up the exception table.
6896 The default is to do nothing. A target that needs/wants to divide
6897 up the table must provide it's own function to do this. */
6899 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
6903 /* This is how to output an internal numbered label where PREFIX is
6904 the class of label and LABELNO is the number within the class. */
6907 default_generate_internal_label (char *buf
, const char *prefix
,
6908 unsigned long labelno
)
6910 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6913 /* This is how to output an internal numbered label where PREFIX is
6914 the class of label and LABELNO is the number within the class. */
6917 default_internal_label (FILE *stream
, const char *prefix
,
6918 unsigned long labelno
)
6920 char *const buf
= (char *) alloca (40 + strlen (prefix
));
6921 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6922 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
6926 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
6929 default_asm_declare_constant_name (FILE *file
, const char *name
,
6930 const_tree exp ATTRIBUTE_UNUSED
,
6931 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
6933 assemble_label (file
, name
);
6936 /* This is the default behavior at the beginning of a file. It's
6937 controlled by two other target-hook toggles. */
6939 default_file_start (void)
6941 if (targetm
.asm_file_start_app_off
6942 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
6943 fputs (ASM_APP_OFF
, asm_out_file
);
6945 if (targetm
.asm_file_start_file_directive
)
6946 output_file_directive (asm_out_file
, main_input_filename
);
6949 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6950 which emits a special section directive used to indicate whether or
6951 not this object file needs an executable stack. This is primarily
6952 a GNU extension to ELF but could be used on other targets. */
6954 int trampolines_created
;
6957 file_end_indicate_exec_stack (void)
6959 unsigned int flags
= SECTION_DEBUG
;
6960 if (trampolines_created
)
6961 flags
|= SECTION_CODE
;
6963 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
6966 /* Emit a special section directive to indicate that this object file
6967 was compiled with -fsplit-stack. This is used to let the linker
6968 detect calls between split-stack code and non-split-stack code, so
6969 that it can modify the split-stack code to allocate a sufficiently
6970 large stack. We emit another special section if there are any
6971 functions in this file which have the no_split_stack attribute, to
6972 prevent the linker from warning about being unable to convert the
6973 functions if they call non-split-stack code. */
6976 file_end_indicate_split_stack (void)
6978 if (flag_split_stack
)
6980 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
6982 if (saw_no_split_stack
)
6983 switch_to_section (get_section (".note.GNU-no-split-stack",
6984 SECTION_DEBUG
, NULL
));
6988 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6989 a get_unnamed_section callback. */
6992 output_section_asm_op (const void *directive
)
6994 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
6997 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6998 the current section is NEW_SECTION. */
7001 switch_to_section (section
*new_section
)
7003 if (in_section
== new_section
)
7006 if (new_section
->common
.flags
& SECTION_FORGET
)
7009 in_section
= new_section
;
7011 switch (SECTION_STYLE (new_section
))
7014 targetm
.asm_out
.named_section (new_section
->named
.name
,
7015 new_section
->named
.common
.flags
,
7016 new_section
->named
.decl
);
7019 case SECTION_UNNAMED
:
7020 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
7023 case SECTION_NOSWITCH
:
7028 new_section
->common
.flags
|= SECTION_DECLARED
;
7031 /* If block symbol SYMBOL has not yet been assigned an offset, place
7032 it at the end of its block. */
7035 place_block_symbol (rtx symbol
)
7037 unsigned HOST_WIDE_INT size
, mask
, offset
;
7038 struct constant_descriptor_rtx
*desc
;
7039 unsigned int alignment
;
7040 struct object_block
*block
;
7043 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7044 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7047 /* Work out the symbol's size and alignment. */
7048 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7050 desc
= SYMBOL_REF_CONSTANT (symbol
);
7051 alignment
= desc
->align
;
7052 size
= GET_MODE_SIZE (desc
->mode
);
7054 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7056 decl
= SYMBOL_REF_DECL (symbol
);
7057 alignment
= DECL_ALIGN (decl
);
7058 size
= get_constant_size (DECL_INITIAL (decl
));
7059 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7060 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7061 && asan_protect_global (DECL_INITIAL (decl
)))
7062 size
+= asan_red_zone_size (size
);
7066 decl
= SYMBOL_REF_DECL (symbol
);
7067 alignment
= get_variable_align (decl
);
7068 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7069 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7070 && asan_protect_global (decl
))
7072 size
+= asan_red_zone_size (size
);
7073 alignment
= MAX (alignment
,
7074 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7078 /* Calculate the object's offset from the start of the block. */
7079 block
= SYMBOL_REF_BLOCK (symbol
);
7080 mask
= alignment
/ BITS_PER_UNIT
- 1;
7081 offset
= (block
->size
+ mask
) & ~mask
;
7082 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7084 /* Record the block's new alignment and size. */
7085 block
->alignment
= MAX (block
->alignment
, alignment
);
7086 block
->size
= offset
+ size
;
7088 vec_safe_push (block
->objects
, symbol
);
7091 /* Return the anchor that should be used to address byte offset OFFSET
7092 from the first object in BLOCK. MODEL is the TLS model used
7096 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7097 enum tls_model model
)
7100 unsigned int begin
, middle
, end
;
7101 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7104 /* Work out the anchor's offset. Use an offset of 0 for the first
7105 anchor so that we don't pessimize the case where we take the address
7106 of a variable at the beginning of the block. This is particularly
7107 useful when a block has only one variable assigned to it.
7109 We try to place anchors RANGE bytes apart, so there can then be
7110 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7111 a ptr_mode offset. With some target settings, the lowest such
7112 anchor might be out of range for the lowest ptr_mode offset;
7113 likewise the highest anchor for the highest offset. Use anchors
7114 at the extreme ends of the ptr_mode range in such cases.
7116 All arithmetic uses unsigned integers in order to avoid
7118 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7119 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7120 range
= max_offset
- min_offset
+ 1;
7125 bias
= 1 << (GET_MODE_BITSIZE (ptr_mode
) - 1);
7128 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7129 delta
-= delta
% range
;
7132 offset
= (HOST_WIDE_INT
) (-delta
);
7136 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7137 delta
-= delta
% range
;
7138 if (delta
> bias
- 1)
7140 offset
= (HOST_WIDE_INT
) delta
;
7144 /* Do a binary search to see if there's already an anchor we can use.
7145 Set BEGIN to the new anchor's index if not. */
7147 end
= vec_safe_length (block
->anchors
);
7148 while (begin
!= end
)
7150 middle
= (end
+ begin
) / 2;
7151 anchor
= (*block
->anchors
)[middle
];
7152 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7154 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7156 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7158 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7164 /* Create a new anchor with a unique label. */
7165 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7166 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7167 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7168 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7170 /* Insert it at index BEGIN. */
7171 vec_safe_insert (block
->anchors
, begin
, anchor
);
7175 /* Output the objects in BLOCK. */
7178 output_object_block (struct object_block
*block
)
7180 struct constant_descriptor_rtx
*desc
;
7182 HOST_WIDE_INT offset
;
7186 if (!block
->objects
)
7189 /* Switch to the section and make sure that the first byte is
7190 suitably aligned. */
7191 switch_to_section (block
->sect
);
7192 assemble_align (block
->alignment
);
7194 /* Define the values of all anchors relative to the current section
7196 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7197 targetm
.asm_out
.output_anchor (symbol
);
7199 /* Output the objects themselves. */
7201 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7203 /* Move to the object's offset, padding with zeros if necessary. */
7204 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7205 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7206 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7208 desc
= SYMBOL_REF_CONSTANT (symbol
);
7209 output_constant_pool_1 (desc
, 1);
7210 offset
+= GET_MODE_SIZE (desc
->mode
);
7212 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7215 decl
= SYMBOL_REF_DECL (symbol
);
7216 assemble_constant_contents (DECL_INITIAL (decl
), XSTR (symbol
, 0),
7218 size
= get_constant_size (DECL_INITIAL (decl
));
7220 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7221 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7222 && asan_protect_global (DECL_INITIAL (decl
)))
7224 size
= asan_red_zone_size (size
);
7225 assemble_zeros (size
);
7232 decl
= SYMBOL_REF_DECL (symbol
);
7233 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7234 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7236 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7237 && asan_protect_global (decl
))
7239 size
= asan_red_zone_size (size
);
7240 assemble_zeros (size
);
7247 /* A htab_traverse callback used to call output_object_block for
7248 each member of object_block_htab. */
7251 output_object_block_htab (void **slot
, void *data ATTRIBUTE_UNUSED
)
7253 output_object_block ((struct object_block
*) (*slot
));
7257 /* Output the definitions of all object_blocks. */
7260 output_object_blocks (void)
7262 htab_traverse (object_block_htab
, output_object_block_htab
, NULL
);
7265 /* This function provides a possible implementation of the
7266 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7267 by -frecord-gcc-switches it creates a new mergeable, string section in the
7268 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7269 contains the switches in ASCII format.
7271 FIXME: This code does not correctly handle double quote characters
7272 that appear inside strings, (it strips them rather than preserving them).
7273 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7274 characters - instead it treats them as sub-string separators. Since
7275 we want to emit NUL strings terminators into the object file we have to use
7279 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7283 case SWITCH_TYPE_PASSED
:
7284 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7285 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7288 case SWITCH_TYPE_DESCRIPTIVE
:
7291 /* Distinguish between invocations where name is NULL. */
7292 static bool started
= false;
7298 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7302 | (SECTION_ENTSIZE
& 1),
7304 switch_to_section (sec
);
7313 /* The return value is currently ignored by the caller, but must be 0.
7314 For -fverbose-asm the return value would be the number of characters
7315 emitted into the assembler file. */
7319 /* Emit text to declare externally defined symbols. It is needed to
7320 properly support non-default visibility. */
7322 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7324 const char *name ATTRIBUTE_UNUSED
)
7326 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7327 set in order to avoid putting out names that are never really
7329 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7330 && targetm
.binds_local_p (decl
))
7331 maybe_assemble_visibility (decl
);
7334 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7337 default_asm_output_source_filename (FILE *file
, const char *name
)
7339 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7340 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7342 fprintf (file
, "\t.file\t");
7343 output_quoted_string (file
, name
);
7348 /* Output a file name in the form wanted by System V. */
7351 output_file_directive (FILE *asm_file
, const char *input_name
)
7356 if (input_name
== NULL
)
7357 input_name
= "<stdin>";
7359 input_name
= remap_debug_filename (input_name
);
7361 len
= strlen (input_name
);
7362 na
= input_name
+ len
;
7364 /* NA gets INPUT_NAME sans directory names. */
7365 while (na
> input_name
)
7367 if (IS_DIR_SEPARATOR (na
[-1]))
7372 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7375 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7378 make_debug_expr_from_rtl (const_rtx exp
)
7380 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7381 enum machine_mode mode
= GET_MODE (exp
);
7384 DECL_ARTIFICIAL (ddecl
) = 1;
7385 if (REG_P (exp
) && REG_EXPR (exp
))
7386 type
= TREE_TYPE (REG_EXPR (exp
));
7387 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7388 type
= TREE_TYPE (MEM_EXPR (exp
));
7391 if (type
&& TYPE_MODE (type
) == mode
)
7392 TREE_TYPE (ddecl
) = type
;
7394 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7395 DECL_MODE (ddecl
) = mode
;
7396 dval
= gen_rtx_DEBUG_EXPR (mode
);
7397 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7398 SET_DECL_RTL (ddecl
, dval
);
7402 #ifdef ELF_ASCII_ESCAPES
7403 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7406 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7411 fputs (STRING_ASM_OP
, f
);
7416 escape
= ELF_ASCII_ESCAPES
[c
];
7423 /* TODO: Print in hex with fast function, important for -flto. */
7424 fprintf (f
, "\\%03o", c
);
7437 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7440 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7442 const char *limit
= s
+ len
;
7443 const char *last_null
= NULL
;
7444 unsigned bytes_in_chunk
= 0;
7448 for (; s
< limit
; s
++)
7452 if (bytes_in_chunk
>= 60)
7461 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7468 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7470 if (bytes_in_chunk
> 0)
7477 default_elf_asm_output_limited_string (f
, s
);
7482 if (bytes_in_chunk
== 0)
7483 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7486 escape
= ELF_ASCII_ESCAPES
[c
];
7494 /* TODO: Print in hex with fast function, important for -flto. */
7495 fprintf (f
, "\\%03o", c
);
7496 bytes_in_chunk
+= 4;
7501 bytes_in_chunk
+= 2;
7508 if (bytes_in_chunk
> 0)
7516 static GTY(()) section
*elf_init_array_section
;
7517 static GTY(()) section
*elf_fini_array_section
;
7520 get_elf_initfini_array_priority_section (int priority
,
7524 if (priority
!= DEFAULT_INIT_PRIORITY
)
7527 sprintf (buf
, "%s.%.5u",
7528 constructor_p
? ".init_array" : ".fini_array",
7530 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7536 if (elf_init_array_section
== NULL
)
7537 elf_init_array_section
7538 = get_section (".init_array",
7539 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7540 sec
= elf_init_array_section
;
7544 if (elf_fini_array_section
== NULL
)
7545 elf_fini_array_section
7546 = get_section (".fini_array",
7547 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7548 sec
= elf_fini_array_section
;
7554 /* Use .init_array section for constructors. */
7557 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7559 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7561 assemble_addr_to_section (symbol
, sec
);
7564 /* Use .fini_array section for destructors. */
7567 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7569 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7571 assemble_addr_to_section (symbol
, sec
);
7574 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7576 This is a bit of a cheat. The real default is a no-op, but this
7577 hook is the default for all targets with a .ident directive. */
7580 default_asm_output_ident_directive (const char *ident_str
)
7582 const char *ident_asm_op
= "\t.ident\t";
7584 /* If we are still in the front end, do not write out the string
7585 to asm_out_file. Instead, add a fake top-level asm statement.
7586 This allows the front ends to use this hook without actually
7587 writing to asm_out_file, to handle #ident or Pragma Ident. */
7588 if (cgraph_state
== CGRAPH_STATE_PARSING
)
7590 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7591 add_asm_node (build_string (strlen (buf
), buf
));
7594 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7597 #include "gt-varasm.h"