1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987-2014 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
21 /* This file handles generation of all the assembler code
22 *except* the instructions of a function.
23 This includes declarations of variables and their initial values.
25 We also output the assembler code for constants stored in memory
26 and are responsible for combining constants with the same value. */
30 #include "coretypes.h"
34 #include "stor-layout.h"
35 #include "stringpool.h"
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
)
556 /* If we do have a profile or(and) LTO phase is executed, we do not need
557 these ELF section. */
558 if (!in_lto_p
|| !flag_profile_values
)
559 return get_named_text_section (decl
, ".text.startup", NULL
);
564 /* Similarly for exit. */
565 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
566 return get_named_text_section (decl
, ".text.exit", NULL
);
568 /* Group cold functions together, similarly for hot code. */
571 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
572 return get_named_text_section (decl
, ".text.unlikely", NULL
);
573 case NODE_FREQUENCY_HOT
:
574 /* If we do have a profile or(and) LTO phase is executed, we do not need
575 these ELF section. */
576 if (!in_lto_p
|| !flag_profile_values
)
577 return get_named_text_section (decl
, ".text.hot", NULL
);
583 /* Return the section for function DECL.
585 If DECL is NULL_TREE, return the text section. We can be passed
586 NULL_TREE under some circumstances by dbxout.c at least.
588 If FORCE_COLD is true, return cold function section ignoring
589 the frequency info of cgraph_node. */
592 function_section_1 (tree decl
, bool force_cold
)
594 section
*section
= NULL
;
595 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
596 bool startup
= false, exit
= false;
600 struct cgraph_node
*node
= cgraph_get_node (decl
);
604 freq
= node
->frequency
;
605 startup
= node
->only_called_at_startup
;
606 exit
= node
->only_called_at_exit
;
610 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
612 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
613 if (decl
!= NULL_TREE
614 && DECL_SECTION_NAME (decl
) != NULL_TREE
)
616 if (targetm
.asm_out
.function_section
)
617 section
= targetm
.asm_out
.function_section (decl
, freq
,
621 return get_named_section (decl
, NULL
, 0);
624 return targetm
.asm_out
.select_section
625 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
628 if (targetm
.asm_out
.function_section
)
629 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
632 return hot_function_section (decl
);
636 /* Return the section for function DECL.
638 If DECL is NULL_TREE, return the text section. We can be passed
639 NULL_TREE under some circumstances by dbxout.c at least. */
642 function_section (tree decl
)
644 /* Handle cases where function splitting code decides
645 to put function entry point into unlikely executed section
646 despite the fact that the function itself is not cold
647 (i.e. it is called rarely but contains a hot loop that is
648 better to live in hot subsection for the code locality). */
649 return function_section_1 (decl
,
650 first_function_block_is_cold
);
653 /* Return the section for the current function, take IN_COLD_SECTION_P
657 current_function_section (void)
659 return function_section_1 (current_function_decl
, in_cold_section_p
);
662 /* Tell assembler to switch to unlikely-to-be-executed text section. */
665 unlikely_text_section (void)
667 return function_section_1 (current_function_decl
, true);
670 /* When called within a function context, return true if the function
671 has been assigned a cold text section and if SECT is that section.
672 When called outside a function context, return true if SECT is the
673 default cold section. */
676 unlikely_text_section_p (section
*sect
)
678 return sect
== function_section_1 (current_function_decl
, true);
681 /* Return the read-only data section associated with function DECL. */
684 default_function_rodata_section (tree decl
)
686 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
688 const char *name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
690 if (DECL_ONE_ONLY (decl
) && HAVE_COMDAT_GROUP
)
696 dot
= strchr (name
+ 1, '.');
699 len
= strlen (dot
) + 8;
700 rname
= (char *) alloca (len
);
702 strcpy (rname
, ".rodata");
704 return get_section (rname
, SECTION_LINKONCE
, decl
);
706 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
707 else if (DECL_ONE_ONLY (decl
)
708 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
710 size_t len
= strlen (name
) + 1;
711 char *rname
= (char *) alloca (len
);
713 memcpy (rname
, name
, len
);
715 return get_section (rname
, SECTION_LINKONCE
, decl
);
717 /* For .text.foo we want to use .rodata.foo. */
718 else if (flag_function_sections
&& flag_data_sections
719 && strncmp (name
, ".text.", 6) == 0)
721 size_t len
= strlen (name
) + 1;
722 char *rname
= (char *) alloca (len
+ 2);
724 memcpy (rname
, ".rodata", 7);
725 memcpy (rname
+ 7, name
+ 5, len
- 5);
726 return get_section (rname
, 0, decl
);
730 return readonly_data_section
;
733 /* Return the read-only data section associated with function DECL
734 for targets where that section should be always the single
735 readonly data section. */
738 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
740 return readonly_data_section
;
743 /* Return the section to use for string merging. */
746 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
747 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
748 unsigned int flags ATTRIBUTE_UNUSED
)
752 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
753 && TREE_CODE (decl
) == STRING_CST
754 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
756 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
757 && TREE_STRING_LENGTH (decl
) >= len
)
759 enum machine_mode mode
;
760 unsigned int modesize
;
764 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
765 char *name
= (char *) alloca (strlen (prefix
) + 30);
767 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
768 modesize
= GET_MODE_BITSIZE (mode
);
769 if (modesize
>= 8 && modesize
<= 256
770 && (modesize
& (modesize
- 1)) == 0)
772 if (align
< modesize
)
775 str
= TREE_STRING_POINTER (decl
);
776 unit
= GET_MODE_SIZE (mode
);
778 /* Check for embedded NUL characters. */
779 for (i
= 0; i
< len
; i
+= unit
)
781 for (j
= 0; j
< unit
; j
++)
782 if (str
[i
+ j
] != '\0')
789 sprintf (name
, "%s.str%d.%d", prefix
,
790 modesize
/ 8, (int) (align
/ 8));
791 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
792 return get_section (name
, flags
, NULL
);
797 return readonly_data_section
;
800 /* Return the section to use for constant merging. */
803 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
804 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
805 unsigned int flags ATTRIBUTE_UNUSED
)
807 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
809 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
815 && (align
& (align
- 1)) == 0)
817 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
818 char *name
= (char *) alloca (strlen (prefix
) + 30);
820 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
821 flags
|= (align
/ 8) | SECTION_MERGE
;
822 return get_section (name
, flags
, NULL
);
824 return readonly_data_section
;
827 /* Given NAME, a putative register name, discard any customary prefixes. */
830 strip_reg_name (const char *name
)
832 #ifdef REGISTER_PREFIX
833 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
834 name
+= strlen (REGISTER_PREFIX
);
836 if (name
[0] == '%' || name
[0] == '#')
841 /* The user has asked for a DECL to have a particular name. Set (or
842 change) it in such a way that we don't prefix an underscore to
845 set_user_assembler_name (tree decl
, const char *name
)
847 char *starred
= (char *) alloca (strlen (name
) + 2);
849 strcpy (starred
+ 1, name
);
850 change_decl_assembler_name (decl
, get_identifier (starred
));
851 SET_DECL_RTL (decl
, NULL_RTX
);
854 /* Decode an `asm' spec for a declaration as a register name.
855 Return the register number, or -1 if nothing specified,
856 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
857 or -3 if ASMSPEC is `cc' and is not recognized,
858 or -4 if ASMSPEC is `memory' and is not recognized.
859 Accept an exact spelling or a decimal number.
860 Prefixes such as % are optional. */
863 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
865 /* Presume just one register is clobbered. */
872 /* Get rid of confusing prefixes. */
873 asmspec
= strip_reg_name (asmspec
);
875 /* Allow a decimal number as a "register name". */
876 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
877 if (! ISDIGIT (asmspec
[i
]))
879 if (asmspec
[0] != 0 && i
< 0)
882 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0)
888 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
890 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
893 #ifdef OVERLAPPING_REGISTER_NAMES
897 const char *const name
;
900 } table
[] = OVERLAPPING_REGISTER_NAMES
;
902 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
904 && ! strcmp (asmspec
, table
[i
].name
))
906 *pnregs
= table
[i
].nregs
;
907 return table
[i
].number
;
910 #endif /* OVERLAPPING_REGISTER_NAMES */
912 #ifdef ADDITIONAL_REGISTER_NAMES
914 static const struct { const char *const name
; const int number
; } table
[]
915 = ADDITIONAL_REGISTER_NAMES
;
917 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
919 && ! strcmp (asmspec
, table
[i
].name
))
920 return table
[i
].number
;
922 #endif /* ADDITIONAL_REGISTER_NAMES */
924 if (!strcmp (asmspec
, "memory"))
927 if (!strcmp (asmspec
, "cc"))
937 decode_reg_name (const char *name
)
940 return decode_reg_name_and_count (name
, &count
);
944 /* Return true if DECL's initializer is suitable for a BSS section. */
947 bss_initializer_p (const_tree decl
)
949 return (DECL_INITIAL (decl
) == NULL
950 || DECL_INITIAL (decl
) == error_mark_node
951 || (flag_zero_initialized_in_bss
952 /* Leave constant zeroes in .rodata so they
954 && !TREE_READONLY (decl
)
955 && initializer_zerop (DECL_INITIAL (decl
))));
958 /* Compute the alignment of variable specified by DECL.
959 DONT_OUTPUT_DATA is from assemble_variable. */
962 align_variable (tree decl
, bool dont_output_data
)
964 unsigned int align
= DECL_ALIGN (decl
);
966 /* In the case for initialing an array whose length isn't specified,
967 where we have not yet been able to do the layout,
968 figure out the proper alignment now. */
969 if (dont_output_data
&& DECL_SIZE (decl
) == 0
970 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
971 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
973 /* Some object file formats have a maximum alignment which they support.
974 In particular, a.out format supports a maximum alignment of 4. */
975 if (align
> MAX_OFILE_ALIGNMENT
)
977 error ("alignment of %q+D is greater than maximum object "
978 "file alignment %d", decl
,
979 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
980 align
= MAX_OFILE_ALIGNMENT
;
983 if (! DECL_USER_ALIGN (decl
))
985 #ifdef DATA_ABI_ALIGNMENT
986 unsigned int data_abi_align
987 = DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
988 /* For backwards compatibility, don't assume the ABI alignment for
990 if (! DECL_THREAD_LOCAL_P (decl
) || data_abi_align
<= BITS_PER_WORD
)
991 align
= data_abi_align
;
994 /* On some machines, it is good to increase alignment sometimes.
995 But as DECL_ALIGN is used both for actually emitting the variable
996 and for code accessing the variable as guaranteed alignment, we
997 can only increase the alignment if it is a performance optimization
998 if the references to it must bind to the current definition. */
999 if (decl_binds_to_current_def_p (decl
))
1001 #ifdef DATA_ALIGNMENT
1002 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1003 /* Don't increase alignment too much for TLS variables - TLS space
1005 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1008 #ifdef CONSTANT_ALIGNMENT
1009 if (DECL_INITIAL (decl
) != 0
1010 && DECL_INITIAL (decl
) != error_mark_node
)
1012 unsigned int const_align
1013 = CONSTANT_ALIGNMENT (DECL_INITIAL (decl
), align
);
1014 /* Don't increase alignment too much for TLS variables - TLS
1015 space is too precious. */
1016 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1017 align
= const_align
;
1023 /* Reset the alignment in case we have made it tighter, so we can benefit
1024 from it in get_pointer_alignment. */
1025 DECL_ALIGN (decl
) = align
;
1028 /* Return DECL_ALIGN (decl), possibly increased for optimization purposes
1029 beyond what align_variable returned. */
1032 get_variable_align (tree decl
)
1034 unsigned int align
= DECL_ALIGN (decl
);
1036 /* For user aligned vars or static vars align_variable already did
1038 if (DECL_USER_ALIGN (decl
) || !TREE_PUBLIC (decl
))
1041 #ifdef DATA_ABI_ALIGNMENT
1042 if (DECL_THREAD_LOCAL_P (decl
))
1043 align
= DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1046 /* For decls that bind to the current definition, align_variable
1047 did also everything, except for not assuming ABI required alignment
1048 of TLS variables. For other vars, increase the alignment here
1049 as an optimization. */
1050 if (!decl_binds_to_current_def_p (decl
))
1052 /* On some machines, it is good to increase alignment sometimes. */
1053 #ifdef DATA_ALIGNMENT
1054 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1055 /* Don't increase alignment too much for TLS variables - TLS space
1057 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1060 #ifdef CONSTANT_ALIGNMENT
1061 if (DECL_INITIAL (decl
) != 0 && DECL_INITIAL (decl
) != error_mark_node
)
1063 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
1065 /* Don't increase alignment too much for TLS variables - TLS space
1067 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1068 align
= const_align
;
1076 /* Return the section into which the given VAR_DECL or CONST_DECL
1077 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1078 section should be used wherever possible. */
1081 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1083 addr_space_t as
= ADDR_SPACE_GENERIC
;
1086 if (TREE_TYPE (decl
) != error_mark_node
)
1087 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1089 if (DECL_COMMON (decl
))
1091 /* If the decl has been given an explicit section name, or it resides
1092 in a non-generic address space, then it isn't common, and shouldn't
1093 be handled as such. */
1094 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1095 && ADDR_SPACE_GENERIC_P (as
));
1096 if (DECL_THREAD_LOCAL_P (decl
))
1097 return tls_comm_section
;
1098 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1099 return comm_section
;
1102 if (DECL_INITIAL (decl
) == error_mark_node
)
1103 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1104 else if (DECL_INITIAL (decl
))
1105 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1109 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1110 if (IN_NAMED_SECTION (decl
))
1111 return get_named_section (decl
, NULL
, reloc
);
1113 if (ADDR_SPACE_GENERIC_P (as
)
1114 && !DECL_THREAD_LOCAL_P (decl
)
1115 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1116 && bss_initializer_p (decl
))
1118 if (!TREE_PUBLIC (decl
)
1119 && !((flag_sanitize
& SANITIZE_ADDRESS
)
1120 && asan_protect_global (decl
)))
1121 return lcomm_section
;
1122 if (bss_noswitch_section
)
1123 return bss_noswitch_section
;
1126 return targetm
.asm_out
.select_section (decl
, reloc
,
1127 get_variable_align (decl
));
1130 /* Return the block into which object_block DECL should be placed. */
1132 static struct object_block
*
1133 get_block_for_decl (tree decl
)
1137 if (TREE_CODE (decl
) == VAR_DECL
)
1139 /* The object must be defined in this translation unit. */
1140 if (DECL_EXTERNAL (decl
))
1143 /* There's no point using object blocks for something that is
1144 isolated by definition. */
1145 if (DECL_ONE_ONLY (decl
))
1149 /* We can only calculate block offsets if the decl has a known
1151 if (DECL_SIZE_UNIT (decl
) == NULL
)
1153 if (!tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
)))
1156 /* Find out which section should contain DECL. We cannot put it into
1157 an object block if it requires a standalone definition. */
1158 if (TREE_CODE (decl
) == VAR_DECL
)
1159 align_variable (decl
, 0);
1160 sect
= get_variable_section (decl
, true);
1161 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1164 return get_block_for_section (sect
);
1167 /* Make sure block symbol SYMBOL is in block BLOCK. */
1170 change_symbol_block (rtx symbol
, struct object_block
*block
)
1172 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1174 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1175 SYMBOL_REF_BLOCK (symbol
) = block
;
1179 /* Return true if it is possible to put DECL in an object_block. */
1182 use_blocks_for_decl_p (tree decl
)
1184 /* Only data DECLs can be placed into object blocks. */
1185 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1188 /* Detect decls created by dw2_force_const_mem. Such decls are
1189 special because DECL_INITIAL doesn't specify the decl's true value.
1190 dw2_output_indirect_constants will instead call assemble_variable
1191 with dont_output_data set to 1 and then print the contents itself. */
1192 if (DECL_INITIAL (decl
) == decl
)
1195 /* If this decl is an alias, then we don't want to emit a
1197 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)))
1200 return targetm
.use_blocks_for_decl_p (decl
);
1203 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1204 have static storage duration. In other words, it should not be an
1205 automatic variable, including PARM_DECLs.
1207 There is, however, one exception: this function handles variables
1208 explicitly placed in a particular register by the user.
1210 This is never called for PARM_DECL nodes. */
1213 make_decl_rtl (tree decl
)
1215 const char *name
= 0;
1219 /* Check that we are not being given an automatic variable. */
1220 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1221 && TREE_CODE (decl
) != RESULT_DECL
);
1223 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1224 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1225 || TREE_STATIC (decl
)
1226 || TREE_PUBLIC (decl
)
1227 || DECL_EXTERNAL (decl
)
1228 || DECL_REGISTER (decl
));
1230 /* And that we were not given a type or a label. */
1231 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1232 && TREE_CODE (decl
) != LABEL_DECL
);
1234 /* For a duplicate declaration, we can be called twice on the
1235 same DECL node. Don't discard the RTL already made. */
1236 if (DECL_RTL_SET_P (decl
))
1238 /* If the old RTL had the wrong mode, fix the mode. */
1239 x
= DECL_RTL (decl
);
1240 if (GET_MODE (x
) != DECL_MODE (decl
))
1241 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1243 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1246 /* ??? Another way to do this would be to maintain a hashed
1247 table of such critters. Instead of adding stuff to a DECL
1248 to give certain attributes to it, we could use an external
1249 hash map from DECL to set of attributes. */
1251 /* Let the target reassign the RTL if it wants.
1252 This is necessary, for example, when one machine specific
1253 decl attribute overrides another. */
1254 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1256 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1257 on the new decl information. */
1259 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1260 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1261 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1266 /* If this variable belongs to the global constant pool, retrieve the
1267 pre-computed RTL or recompute it in LTO mode. */
1268 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_IN_CONSTANT_POOL (decl
))
1270 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1274 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
1276 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1277 && DECL_REGISTER (decl
))
1279 error ("register name not specified for %q+D", decl
);
1281 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1283 const char *asmspec
= name
+1;
1284 enum machine_mode mode
= DECL_MODE (decl
);
1285 reg_number
= decode_reg_name (asmspec
);
1286 /* First detect errors in declaring global registers. */
1287 if (reg_number
== -1)
1288 error ("register name not specified for %q+D", decl
);
1289 else if (reg_number
< 0)
1290 error ("invalid register name for %q+D", decl
);
1291 else if (mode
== BLKmode
)
1292 error ("data type of %q+D isn%'t suitable for a register",
1294 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1295 error ("the register specified for %q+D cannot be accessed"
1296 " by the current target", decl
);
1297 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1298 error ("the register specified for %q+D is not general enough"
1299 " to be used as a register variable", decl
);
1300 else if (!HARD_REGNO_MODE_OK (reg_number
, mode
))
1301 error ("register specified for %q+D isn%'t suitable for data type",
1303 /* Now handle properly declared static register variables. */
1308 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1310 DECL_INITIAL (decl
) = 0;
1311 error ("global register variable has initial value");
1313 if (TREE_THIS_VOLATILE (decl
))
1314 warning (OPT_Wvolatile_register_var
,
1315 "optimization may eliminate reads and/or "
1316 "writes to register variables");
1318 /* If the user specified one of the eliminables registers here,
1319 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1320 confused with that register and be eliminated. This usage is
1321 somewhat suspect... */
1323 SET_DECL_RTL (decl
, gen_rtx_raw_REG (mode
, reg_number
));
1324 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1325 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1327 if (TREE_STATIC (decl
))
1329 /* Make this register global, so not usable for anything
1331 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1332 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1333 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1335 nregs
= hard_regno_nregs
[reg_number
][mode
];
1337 globalize_reg (decl
, reg_number
+ --nregs
);
1340 /* As a register variable, it has no section. */
1344 /* Now handle ordinary static variables and functions (in memory).
1345 Also handle vars declared register invalidly. */
1346 else if (name
[0] == '*')
1348 #ifdef REGISTER_PREFIX
1349 if (strlen (REGISTER_PREFIX
) != 0)
1351 reg_number
= decode_reg_name (name
);
1352 if (reg_number
>= 0 || reg_number
== -3)
1353 error ("register name given for non-register variable %q+D", decl
);
1358 /* Specifying a section attribute on a variable forces it into a
1359 non-.bss section, and thus it cannot be common. */
1360 /* FIXME: In general this code should not be necessary because
1361 visibility pass is doing the same work. But notice_global_symbol
1362 is called early and it needs to make DECL_RTL to get the name.
1363 we take care of recomputing the DECL_RTL after visibility is changed. */
1364 if (TREE_CODE (decl
) == VAR_DECL
1365 && DECL_SECTION_NAME (decl
) != NULL_TREE
1366 && DECL_INITIAL (decl
) == NULL_TREE
1367 && DECL_COMMON (decl
))
1368 DECL_COMMON (decl
) = 0;
1370 /* Variables can't be both common and weak. */
1371 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1372 DECL_COMMON (decl
) = 0;
1374 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1375 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1378 enum machine_mode address_mode
= Pmode
;
1379 if (TREE_TYPE (decl
) != error_mark_node
)
1381 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1382 address_mode
= targetm
.addr_space
.address_mode (as
);
1384 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1386 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1387 SET_SYMBOL_REF_DECL (x
, decl
);
1389 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1390 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1391 set_mem_attributes (x
, decl
, 1);
1392 SET_DECL_RTL (decl
, x
);
1394 /* Optionally set flags or add text to the name to record information
1395 such as that it is a function name.
1396 If the name is changed, the macro ASM_OUTPUT_LABELREF
1397 will have to know how to strip this information. */
1398 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1401 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1402 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1406 make_decl_rtl_for_debug (tree decl
)
1408 unsigned int save_aliasing_flag
;
1411 if (DECL_RTL_SET_P (decl
))
1412 return DECL_RTL (decl
);
1414 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1415 call new_alias_set. If running with -fcompare-debug, sometimes
1416 we do not want to create alias sets that will throw the alias
1417 numbers off in the comparison dumps. So... clearing
1418 flag_strict_aliasing will keep new_alias_set() from creating a
1420 save_aliasing_flag
= flag_strict_aliasing
;
1421 flag_strict_aliasing
= 0;
1423 rtl
= DECL_RTL (decl
);
1424 /* Reset DECL_RTL back, as various parts of the compiler expects
1425 DECL_RTL set meaning it is actually going to be output. */
1426 SET_DECL_RTL (decl
, NULL
);
1428 flag_strict_aliasing
= save_aliasing_flag
;
1432 /* Output a string of literal assembler code
1433 for an `asm' keyword used between functions. */
1436 assemble_asm (tree string
)
1441 if (TREE_CODE (string
) == ADDR_EXPR
)
1442 string
= TREE_OPERAND (string
, 0);
1444 p
= TREE_STRING_POINTER (string
);
1445 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1448 /* Write the address of the entity given by SYMBOL to SEC. */
1450 assemble_addr_to_section (rtx symbol
, section
*sec
)
1452 switch_to_section (sec
);
1453 assemble_align (POINTER_SIZE
);
1454 assemble_integer (symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1457 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1458 not) section for PRIORITY. */
1460 get_cdtor_priority_section (int priority
, bool constructor_p
)
1464 /* ??? This only works reliably with the GNU linker. */
1465 sprintf (buf
, "%s.%.5u",
1466 constructor_p
? ".ctors" : ".dtors",
1467 /* Invert the numbering so the linker puts us in the proper
1468 order; constructors are run from right to left, and the
1469 linker sorts in increasing order. */
1470 MAX_INIT_PRIORITY
- priority
);
1471 return get_section (buf
, SECTION_WRITE
, NULL
);
1475 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1479 if (priority
!= DEFAULT_INIT_PRIORITY
)
1480 sec
= get_cdtor_priority_section (priority
,
1481 /*constructor_p=*/false);
1483 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1485 assemble_addr_to_section (symbol
, sec
);
1488 #ifdef DTORS_SECTION_ASM_OP
1490 default_dtor_section_asm_out_destructor (rtx symbol
,
1491 int priority ATTRIBUTE_UNUSED
)
1493 assemble_addr_to_section (symbol
, dtors_section
);
1498 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1502 if (priority
!= DEFAULT_INIT_PRIORITY
)
1503 sec
= get_cdtor_priority_section (priority
,
1504 /*constructor_p=*/true);
1506 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1508 assemble_addr_to_section (symbol
, sec
);
1511 #ifdef CTORS_SECTION_ASM_OP
1513 default_ctor_section_asm_out_constructor (rtx symbol
,
1514 int priority ATTRIBUTE_UNUSED
)
1516 assemble_addr_to_section (symbol
, ctors_section
);
1520 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1521 a nonzero value if the constant pool should be output before the
1522 start of the function, or a zero value if the pool should output
1523 after the end of the function. The default is to put it before the
1526 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1527 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1530 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1531 to be output to assembler.
1532 Set first_global_object_name and weak_global_object_name as appropriate. */
1535 notice_global_symbol (tree decl
)
1537 const char **type
= &first_global_object_name
;
1539 if (first_global_object_name
1540 || !TREE_PUBLIC (decl
)
1541 || DECL_EXTERNAL (decl
)
1542 || !DECL_NAME (decl
)
1543 || (TREE_CODE (decl
) != FUNCTION_DECL
1544 && (TREE_CODE (decl
) != VAR_DECL
1545 || (DECL_COMMON (decl
)
1546 && (DECL_INITIAL (decl
) == 0
1547 || DECL_INITIAL (decl
) == error_mark_node
))))
1548 || !MEM_P (DECL_RTL (decl
)))
1551 /* We win when global object is found, but it is useful to know about weak
1552 symbol as well so we can produce nicer unique names. */
1553 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1554 type
= &weak_global_object_name
;
1560 rtx decl_rtl
= DECL_RTL (decl
);
1562 p
= targetm
.strip_name_encoding (XSTR (XEXP (decl_rtl
, 0), 0));
1563 name
= ggc_strdup (p
);
1569 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1570 current function goes into the cold section, so that targets can use
1571 current_function_section during RTL expansion. DECL describes the
1575 decide_function_section (tree decl
)
1577 first_function_block_is_cold
= false;
1579 if (flag_reorder_blocks_and_partition
)
1580 /* We will decide in assemble_start_function. */
1583 if (DECL_SECTION_NAME (decl
))
1585 struct cgraph_node
*node
= cgraph_get_node (current_function_decl
);
1586 /* Calls to function_section rely on first_function_block_is_cold
1588 first_function_block_is_cold
= (node
1590 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1593 in_cold_section_p
= first_function_block_is_cold
;
1596 /* Output assembler code for the constant pool of a function and associated
1597 with defining the name of the function. DECL describes the function.
1598 NAME is the function's name. For the constant pool, we use the current
1599 constant pool data. */
1602 assemble_start_function (tree decl
, const char *fnname
)
1605 char tmp_label
[100];
1606 bool hot_label_written
= false;
1608 if (flag_reorder_blocks_and_partition
)
1610 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1611 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1612 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1613 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1614 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1615 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1616 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1617 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1622 crtl
->subsections
.hot_section_label
= NULL
;
1623 crtl
->subsections
.cold_section_label
= NULL
;
1624 crtl
->subsections
.hot_section_end_label
= NULL
;
1625 crtl
->subsections
.cold_section_end_label
= NULL
;
1628 /* The following code does not need preprocessing in the assembler. */
1632 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1633 output_constant_pool (fnname
, decl
);
1635 /* Make sure the not and cold text (code) sections are properly
1636 aligned. This is necessary here in the case where the function
1637 has both hot and cold sections, because we don't want to re-set
1638 the alignment when the section switch happens mid-function. */
1640 if (flag_reorder_blocks_and_partition
)
1642 first_function_block_is_cold
= false;
1644 switch_to_section (unlikely_text_section ());
1645 assemble_align (DECL_ALIGN (decl
));
1646 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1648 /* When the function starts with a cold section, we need to explicitly
1649 align the hot section and write out the hot section label.
1650 But if the current function is a thunk, we do not have a CFG. */
1652 && BB_PARTITION (ENTRY_BLOCK_PTR_FOR_FN (cfun
)->next_bb
) == BB_COLD_PARTITION
)
1654 switch_to_section (text_section
);
1655 assemble_align (DECL_ALIGN (decl
));
1656 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1657 hot_label_written
= true;
1658 first_function_block_is_cold
= true;
1660 in_cold_section_p
= first_function_block_is_cold
;
1664 /* Switch to the correct text section for the start of the function. */
1666 switch_to_section (function_section (decl
));
1667 if (flag_reorder_blocks_and_partition
1668 && !hot_label_written
)
1669 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1671 /* Tell assembler to move to target machine's alignment for functions. */
1672 align
= floor_log2 (DECL_ALIGN (decl
) / BITS_PER_UNIT
);
1675 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1678 /* Handle a user-specified function alignment.
1679 Note that we still need to align to DECL_ALIGN, as above,
1680 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1681 if (! DECL_USER_ALIGN (decl
)
1682 && align_functions_log
> align
1683 && optimize_function_for_speed_p (cfun
))
1685 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1686 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1687 align_functions_log
, align_functions
- 1);
1689 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1693 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1694 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1697 if (!DECL_IGNORED_P (decl
))
1698 (*debug_hooks
->begin_function
) (decl
);
1700 /* Make function name accessible from other files, if appropriate. */
1702 if (TREE_PUBLIC (decl
))
1704 notice_global_symbol (decl
);
1706 globalize_decl (decl
);
1708 maybe_assemble_visibility (decl
);
1711 if (DECL_PRESERVE_P (decl
))
1712 targetm
.asm_out
.mark_decl_preserved (fnname
);
1714 /* Do any machine/system dependent processing of the function name. */
1715 #ifdef ASM_DECLARE_FUNCTION_NAME
1716 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1718 /* Standard thing is just output label for the function. */
1719 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1720 #endif /* ASM_DECLARE_FUNCTION_NAME */
1722 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1723 saw_no_split_stack
= true;
1726 /* Output assembler code associated with defining the size of the
1727 function. DECL describes the function. NAME is the function's name. */
1730 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1732 #ifdef ASM_DECLARE_FUNCTION_SIZE
1733 /* We could have switched section in the middle of the function. */
1734 if (flag_reorder_blocks_and_partition
)
1735 switch_to_section (function_section (decl
));
1736 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1738 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1740 output_constant_pool (fnname
, decl
);
1741 switch_to_section (function_section (decl
)); /* need to switch back */
1743 /* Output labels for end of hot/cold text sections (to be used by
1745 if (flag_reorder_blocks_and_partition
)
1747 section
*save_text_section
;
1749 save_text_section
= in_section
;
1750 switch_to_section (unlikely_text_section ());
1751 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1752 if (first_function_block_is_cold
)
1753 switch_to_section (text_section
);
1755 switch_to_section (function_section (decl
));
1756 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1757 switch_to_section (save_text_section
);
1761 /* Assemble code to leave SIZE bytes of zeros. */
1764 assemble_zeros (unsigned HOST_WIDE_INT size
)
1766 /* Do no output if -fsyntax-only. */
1767 if (flag_syntax_only
)
1770 #ifdef ASM_NO_SKIP_IN_TEXT
1771 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1772 so we must output 0s explicitly in the text section. */
1773 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1775 unsigned HOST_WIDE_INT i
;
1776 for (i
= 0; i
< size
; i
++)
1777 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1782 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1785 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1788 assemble_align (int align
)
1790 if (align
> BITS_PER_UNIT
)
1792 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1796 /* Assemble a string constant with the specified C string as contents. */
1799 assemble_string (const char *p
, int size
)
1804 /* If the string is very long, split it up. */
1808 int thissize
= size
- pos
;
1809 if (thissize
> maximum
)
1812 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1820 /* A noswitch_section_callback for lcomm_section. */
1823 emit_local (tree decl ATTRIBUTE_UNUSED
,
1824 const char *name ATTRIBUTE_UNUSED
,
1825 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1826 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1828 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1829 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1830 size
, DECL_ALIGN (decl
));
1832 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1833 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1836 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1841 /* A noswitch_section_callback for bss_noswitch_section. */
1843 #if defined ASM_OUTPUT_ALIGNED_BSS
1845 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1846 const char *name ATTRIBUTE_UNUSED
,
1847 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1848 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1850 #if defined ASM_OUTPUT_ALIGNED_BSS
1851 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
,
1852 get_variable_align (decl
));
1858 /* A noswitch_section_callback for comm_section. */
1861 emit_common (tree decl ATTRIBUTE_UNUSED
,
1862 const char *name ATTRIBUTE_UNUSED
,
1863 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1864 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1866 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1867 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1868 size
, get_variable_align (decl
));
1870 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1871 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
,
1872 get_variable_align (decl
));
1875 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1880 /* A noswitch_section_callback for tls_comm_section. */
1883 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1884 const char *name ATTRIBUTE_UNUSED
,
1885 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1886 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1888 #ifdef ASM_OUTPUT_TLS_COMMON
1889 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
1892 sorry ("thread-local COMMON data not implemented");
1897 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1898 NAME is the name of DECL's SYMBOL_REF. */
1901 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
,
1904 unsigned HOST_WIDE_INT size
, rounded
;
1906 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
1909 if ((flag_sanitize
& SANITIZE_ADDRESS
) && asan_protect_global (decl
))
1910 size
+= asan_red_zone_size (size
);
1912 /* Don't allocate zero bytes of common,
1913 since that means "undefined external" in the linker. */
1917 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1918 so that each uninitialized object starts on such a boundary. */
1919 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
1920 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
1921 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
1923 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
1924 && (unsigned HOST_WIDE_INT
) (align
/ BITS_PER_UNIT
) > rounded
)
1925 error ("requested alignment for %q+D is greater than "
1926 "implemented alignment of %wu", decl
, rounded
);
1929 /* A subroutine of assemble_variable. Output the label and contents of
1930 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1931 is as for assemble_variable. */
1934 assemble_variable_contents (tree decl
, const char *name
,
1935 bool dont_output_data
)
1937 /* Do any machine/system dependent processing of the object. */
1938 #ifdef ASM_DECLARE_OBJECT_NAME
1939 last_assemble_variable_decl
= decl
;
1940 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
1942 /* Standard thing is just output label for the object. */
1943 ASM_OUTPUT_LABEL (asm_out_file
, name
);
1944 #endif /* ASM_DECLARE_OBJECT_NAME */
1946 if (!dont_output_data
)
1948 if (DECL_INITIAL (decl
)
1949 && DECL_INITIAL (decl
) != error_mark_node
1950 && !initializer_zerop (DECL_INITIAL (decl
)))
1951 /* Output the actual data. */
1952 output_constant (DECL_INITIAL (decl
),
1953 tree_to_uhwi (DECL_SIZE_UNIT (decl
)),
1954 get_variable_align (decl
));
1956 /* Leave space for it. */
1957 assemble_zeros (tree_to_uhwi (DECL_SIZE_UNIT (decl
)));
1961 /* Assemble everything that is needed for a variable or function declaration.
1962 Not used for automatic variables, and not used for function definitions.
1963 Should not be called for variables of incomplete structure type.
1965 TOP_LEVEL is nonzero if this variable has file scope.
1966 AT_END is nonzero if this is the special handling, at end of compilation,
1967 to define things that have had only tentative definitions.
1968 DONT_OUTPUT_DATA if nonzero means don't actually output the
1969 initial value (that will be done by the caller). */
1972 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
1973 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
1976 rtx decl_rtl
, symbol
;
1979 bool asan_protected
= false;
1981 /* This function is supposed to handle VARIABLES. Ensure we have one. */
1982 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
1984 /* Emulated TLS had better not get this far. */
1985 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
1987 last_assemble_variable_decl
= 0;
1989 /* Normally no need to say anything here for external references,
1990 since assemble_external is called by the language-specific code
1991 when a declaration is first seen. */
1993 if (DECL_EXTERNAL (decl
))
1996 /* Do nothing for global register variables. */
1997 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
1999 TREE_ASM_WRITTEN (decl
) = 1;
2003 /* If type was incomplete when the variable was declared,
2004 see if it is complete now. */
2006 if (DECL_SIZE (decl
) == 0)
2007 layout_decl (decl
, 0);
2009 /* Still incomplete => don't allocate it; treat the tentative defn
2010 (which is what it must have been) as an `extern' reference. */
2012 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2014 error ("storage size of %q+D isn%'t known", decl
);
2015 TREE_ASM_WRITTEN (decl
) = 1;
2019 /* The first declaration of a variable that comes through this function
2020 decides whether it is global (in C, has external linkage)
2021 or local (in C, has internal linkage). So do nothing more
2022 if this function has already run. */
2024 if (TREE_ASM_WRITTEN (decl
))
2027 /* Make sure targetm.encode_section_info is invoked before we set
2029 decl_rtl
= DECL_RTL (decl
);
2031 TREE_ASM_WRITTEN (decl
) = 1;
2033 /* Do no output if -fsyntax-only. */
2034 if (flag_syntax_only
)
2037 if (! dont_output_data
2038 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
2040 error ("size of variable %q+D is too large", decl
);
2044 gcc_assert (MEM_P (decl_rtl
));
2045 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2046 symbol
= XEXP (decl_rtl
, 0);
2048 /* If this symbol belongs to the tree constant pool, output the constant
2049 if it hasn't already been written. */
2050 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
2052 tree decl
= SYMBOL_REF_DECL (symbol
);
2053 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
2054 output_constant_def_contents (symbol
);
2060 name
= XSTR (symbol
, 0);
2061 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2062 notice_global_symbol (decl
);
2064 /* Compute the alignment of this data. */
2066 align_variable (decl
, dont_output_data
);
2068 if ((flag_sanitize
& SANITIZE_ADDRESS
)
2069 && asan_protect_global (decl
))
2071 asan_protected
= true;
2072 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
2073 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
2076 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2078 align
= get_variable_align (decl
);
2080 if (TREE_PUBLIC (decl
))
2081 maybe_assemble_visibility (decl
);
2083 if (DECL_PRESERVE_P (decl
))
2084 targetm
.asm_out
.mark_decl_preserved (name
);
2086 /* First make the assembler name(s) global if appropriate. */
2087 sect
= get_variable_section (decl
, false);
2088 if (TREE_PUBLIC (decl
)
2089 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2090 globalize_decl (decl
);
2092 /* Output any data that we will need to use the address of. */
2093 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2094 output_addressed_constants (DECL_INITIAL (decl
));
2096 /* dbxout.c needs to know this. */
2097 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2098 DECL_IN_TEXT_SECTION (decl
) = 1;
2100 /* If the decl is part of an object_block, make sure that the decl
2101 has been positioned within its block, but do not write out its
2102 definition yet. output_object_blocks will do that later. */
2103 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2105 gcc_assert (!dont_output_data
);
2106 place_block_symbol (symbol
);
2108 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2109 assemble_noswitch_variable (decl
, name
, sect
, align
);
2112 /* The following bit of code ensures that vtable_map
2113 variables are not only in the comdat section, but that
2114 each variable has its own unique comdat name. If this
2115 code is removed, the variables end up in the same section
2116 with a single comdat name.
2118 FIXME: resolve_unique_section needs to deal better with
2119 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
2120 that is fixed, this if-else statement can be replaced with
2121 a single call to "switch_to_section (sect)". */
2122 if (sect
->named
.name
2123 && (strcmp (sect
->named
.name
, ".vtable_map_vars") == 0))
2125 #if defined (OBJECT_FORMAT_ELF)
2126 targetm
.asm_out
.named_section (sect
->named
.name
,
2127 sect
->named
.common
.flags
2132 switch_to_section (sect
);
2136 switch_to_section (sect
);
2137 if (align
> BITS_PER_UNIT
)
2138 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
2139 assemble_variable_contents (decl
, name
, dont_output_data
);
2142 unsigned HOST_WIDE_INT
int size
2143 = tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2144 assemble_zeros (asan_red_zone_size (size
));
2150 /* Given a function declaration (FN_DECL), this function assembles the
2151 function into the .preinit_array section. */
2154 assemble_vtv_preinit_initializer (tree fn_decl
)
2157 unsigned flags
= SECTION_WRITE
;
2158 rtx symbol
= XEXP (DECL_RTL (fn_decl
), 0);
2160 flags
|= SECTION_NOTYPE
;
2161 sect
= get_section (".preinit_array", flags
, fn_decl
);
2162 switch_to_section (sect
);
2163 assemble_addr_to_section (symbol
, sect
);
2166 /* Return 1 if type TYPE contains any pointers. */
2169 contains_pointers_p (tree type
)
2171 switch (TREE_CODE (type
))
2174 case REFERENCE_TYPE
:
2175 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2176 so I'll play safe and return 1. */
2182 case QUAL_UNION_TYPE
:
2185 /* For a type that has fields, see if the fields have pointers. */
2186 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2187 if (TREE_CODE (fields
) == FIELD_DECL
2188 && contains_pointers_p (TREE_TYPE (fields
)))
2194 /* An array type contains pointers if its element type does. */
2195 return contains_pointers_p (TREE_TYPE (type
));
2202 /* We delay assemble_external processing until
2203 the compilation unit is finalized. This is the best we can do for
2204 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2205 it all the way to final. See PR 17982 for further discussion. */
2206 static GTY(()) tree pending_assemble_externals
;
2208 #ifdef ASM_OUTPUT_EXTERNAL
2209 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2210 As a result, assemble_external can be called after the list of externals
2211 is processed and the pointer set destroyed. */
2212 static bool pending_assemble_externals_processed
;
2214 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2215 TREE_LIST in assemble_external. */
2216 static struct pointer_set_t
*pending_assemble_externals_set
;
2218 /* True if DECL is a function decl for which no out-of-line copy exists.
2219 It is assumed that DECL's assembler name has been set. */
2222 incorporeal_function_p (tree decl
)
2224 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2228 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2229 && (DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
2230 || DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA_WITH_ALIGN
))
2233 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2234 /* Atomic or sync builtins which have survived this far will be
2235 resolved externally and therefore are not incorporeal. */
2236 if (strncmp (name
, "__builtin_", 10) == 0)
2242 /* Actually do the tests to determine if this is necessary, and invoke
2243 ASM_OUTPUT_EXTERNAL. */
2245 assemble_external_real (tree decl
)
2247 rtx rtl
= DECL_RTL (decl
);
2249 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2250 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2251 && !incorporeal_function_p (decl
))
2253 /* Some systems do require some output. */
2254 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2255 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2261 process_pending_assemble_externals (void)
2263 #ifdef ASM_OUTPUT_EXTERNAL
2265 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2266 assemble_external_real (TREE_VALUE (list
));
2268 pending_assemble_externals
= 0;
2269 pending_assemble_externals_processed
= true;
2270 pointer_set_destroy (pending_assemble_externals_set
);
2274 /* This TREE_LIST contains any weak symbol declarations waiting
2276 static GTY(()) tree weak_decls
;
2278 /* Output something to declare an external symbol to the assembler,
2279 and qualifiers such as weakness. (Most assemblers don't need
2280 extern declaration, so we normally output nothing.) Do nothing if
2281 DECL is not external. */
2284 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2286 /* Make sure that the ASM_OUT_FILE is open.
2287 If it's not, we should not be calling this function. */
2288 gcc_assert (asm_out_file
);
2290 /* In a perfect world, the following condition would be true.
2291 Sadly, the Java and Go front ends emit assembly *from the front end*,
2292 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2294 /* This function should only be called if we are expanding, or have
2296 Ideally, only final.c would be calling this function, but it is
2297 not clear whether that would break things somehow. See PR 17982
2298 for further discussion. */
2299 gcc_assert (cgraph_state
== CGRAPH_STATE_EXPANSION
2300 || cgraph_state
== CGRAPH_STATE_FINISHED
);
2303 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2306 /* We want to output annotation for weak and external symbols at
2307 very last to check if they are references or not. */
2309 if (TARGET_SUPPORTS_WEAK
2311 /* TREE_STATIC is a weird and abused creature which is not
2312 generally the right test for whether an entity has been
2313 locally emitted, inlined or otherwise not-really-extern, but
2314 for declarations that can be weak, it happens to be
2316 && !TREE_STATIC (decl
)
2317 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2318 && value_member (decl
, weak_decls
) == NULL_TREE
)
2319 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2321 #ifdef ASM_OUTPUT_EXTERNAL
2322 if (pending_assemble_externals_processed
)
2324 assemble_external_real (decl
);
2328 if (! pointer_set_insert (pending_assemble_externals_set
, decl
))
2329 pending_assemble_externals
= tree_cons (NULL
, decl
,
2330 pending_assemble_externals
);
2334 /* Similar, for calling a library function FUN. */
2337 assemble_external_libcall (rtx fun
)
2339 /* Declare library function name external when first used, if nec. */
2340 if (! SYMBOL_REF_USED (fun
))
2342 SYMBOL_REF_USED (fun
) = 1;
2343 targetm
.asm_out
.external_libcall (fun
);
2347 /* Assemble a label named NAME. */
2350 assemble_label (FILE *file
, const char *name
)
2352 ASM_OUTPUT_LABEL (file
, name
);
2355 /* Set the symbol_referenced flag for ID. */
2357 mark_referenced (tree id
)
2359 TREE_SYMBOL_REFERENCED (id
) = 1;
2362 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2364 mark_decl_referenced (tree decl
)
2366 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2368 /* Extern inline functions don't become needed when referenced.
2369 If we know a method will be emitted in other TU and no new
2370 functions can be marked reachable, just use the external
2372 struct cgraph_node
*node
= cgraph_get_create_node (decl
);
2373 if (!DECL_EXTERNAL (decl
)
2374 && !node
->definition
)
2375 cgraph_mark_force_output_node (node
);
2377 else if (TREE_CODE (decl
) == VAR_DECL
)
2379 varpool_node
*node
= varpool_node_for_decl (decl
);
2380 /* C++ frontend use mark_decl_references to force COMDAT variables
2381 to be output that might appear dead otherwise. */
2382 node
->force_output
= true;
2384 /* else do nothing - we can get various sorts of CST nodes here,
2385 which do not need to be marked. */
2389 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2390 until we find an identifier that is not itself a transparent alias.
2391 Modify the alias passed to it by reference (and all aliases on the
2392 way to the ultimate target), such that they do not have to be
2393 followed again, and return the ultimate target of the alias
2397 ultimate_transparent_alias_target (tree
*alias
)
2399 tree target
= *alias
;
2401 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
2403 gcc_assert (TREE_CHAIN (target
));
2404 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
2405 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
2406 && ! TREE_CHAIN (target
));
2413 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2414 starts with a *, the rest of NAME is output verbatim. Otherwise
2415 NAME is transformed in a target-specific way (usually by the
2416 addition of an underscore). */
2419 assemble_name_raw (FILE *file
, const char *name
)
2422 fputs (&name
[1], file
);
2424 ASM_OUTPUT_LABELREF (file
, name
);
2427 /* Like assemble_name_raw, but should be used when NAME might refer to
2428 an entity that is also represented as a tree (like a function or
2429 variable). If NAME does refer to such an entity, that entity will
2430 be marked as referenced. */
2433 assemble_name (FILE *file
, const char *name
)
2435 const char *real_name
;
2438 real_name
= targetm
.strip_name_encoding (name
);
2440 id
= maybe_get_identifier (real_name
);
2445 mark_referenced (id
);
2446 ultimate_transparent_alias_target (&id
);
2448 name
= IDENTIFIER_POINTER (id
);
2449 gcc_assert (! TREE_CHAIN (id
));
2452 assemble_name_raw (file
, name
);
2455 /* Allocate SIZE bytes writable static space with a gensym name
2456 and return an RTX to refer to its address. */
2459 assemble_static_space (unsigned HOST_WIDE_INT size
)
2462 const char *namestring
;
2465 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2467 namestring
= ggc_strdup (name
);
2469 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2470 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2472 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2473 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2476 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2477 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2480 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2481 so that each uninitialized object starts on such a boundary. */
2482 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2483 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2484 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2485 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2486 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2487 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2494 /* Assemble the static constant template for function entry trampolines.
2495 This is done at most once per compilation.
2496 Returns an RTX for the address of the template. */
2498 static GTY(()) rtx initial_trampoline
;
2501 assemble_trampoline_template (void)
2508 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2510 if (initial_trampoline
)
2511 return initial_trampoline
;
2513 /* By default, put trampoline templates in read-only data section. */
2515 #ifdef TRAMPOLINE_SECTION
2516 switch_to_section (TRAMPOLINE_SECTION
);
2518 switch_to_section (readonly_data_section
);
2521 /* Write the assembler code to define one. */
2522 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2524 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2526 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2527 targetm
.asm_out
.trampoline_template (asm_out_file
);
2529 /* Record the rtl to refer to it. */
2530 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2531 name
= ggc_strdup (label
);
2532 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2533 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2535 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2536 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2537 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2539 return initial_trampoline
;
2542 /* A and B are either alignments or offsets. Return the minimum alignment
2543 that may be assumed after adding the two together. */
2545 static inline unsigned
2546 min_align (unsigned int a
, unsigned int b
)
2548 return (a
| b
) & -(a
| b
);
2551 /* Return the assembler directive for creating a given kind of integer
2552 object. SIZE is the number of bytes in the object and ALIGNED_P
2553 indicates whether it is known to be aligned. Return NULL if the
2554 assembly dialect has no such directive.
2556 The returned string should be printed at the start of a new line and
2557 be followed immediately by the object's initial value. */
2560 integer_asm_op (int size
, int aligned_p
)
2562 struct asm_int_op
*ops
;
2565 ops
= &targetm
.asm_out
.aligned_op
;
2567 ops
= &targetm
.asm_out
.unaligned_op
;
2572 return targetm
.asm_out
.byte_op
;
2586 /* Use directive OP to assemble an integer object X. Print OP at the
2587 start of the line, followed immediately by the value of X. */
2590 assemble_integer_with_op (const char *op
, rtx x
)
2592 fputs (op
, asm_out_file
);
2593 output_addr_const (asm_out_file
, x
);
2594 fputc ('\n', asm_out_file
);
2597 /* The default implementation of the asm_out.integer target hook. */
2600 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2601 unsigned int size ATTRIBUTE_UNUSED
,
2602 int aligned_p ATTRIBUTE_UNUSED
)
2604 const char *op
= integer_asm_op (size
, aligned_p
);
2605 /* Avoid GAS bugs for large values. Specifically negative values whose
2606 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2607 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE
/ BITS_PER_UNIT
)
2609 return op
&& (assemble_integer_with_op (op
, x
), true);
2612 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2613 the alignment of the integer in bits. Return 1 if we were able to output
2614 the constant, otherwise 0. We must be able to output the constant,
2615 if FORCE is nonzero. */
2618 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2622 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2624 /* See if the target hook can handle this kind of object. */
2625 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2628 /* If the object is a multi-byte one, try splitting it up. Split
2629 it into words it if is multi-word, otherwise split it into bytes. */
2632 enum machine_mode omode
, imode
;
2633 unsigned int subalign
;
2634 unsigned int subsize
, i
;
2635 enum mode_class mclass
;
2637 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2638 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2639 if (GET_CODE (x
) == CONST_FIXED
)
2640 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2644 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2645 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2647 for (i
= 0; i
< size
; i
+= subsize
)
2649 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2650 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2656 /* If we've printed some of it, but not all of it, there's no going
2661 gcc_assert (!force
);
2667 assemble_real (REAL_VALUE_TYPE d
, enum machine_mode mode
, unsigned int align
)
2669 long data
[4] = {0, 0, 0, 0};
2671 int bitsize
, nelts
, nunits
, units_per
;
2673 /* This is hairy. We have a quantity of known size. real_to_target
2674 will put it into an array of *host* longs, 32 bits per element
2675 (even if long is more than 32 bits). We need to determine the
2676 number of array elements that are occupied (nelts) and the number
2677 of *target* min-addressable units that will be occupied in the
2678 object file (nunits). We cannot assume that 32 divides the
2679 mode's bitsize (size * BITS_PER_UNIT) evenly.
2681 size * BITS_PER_UNIT is used here to make sure that padding bits
2682 (which might appear at either end of the value; real_to_target
2683 will include the padding bits in its output array) are included. */
2685 nunits
= GET_MODE_SIZE (mode
);
2686 bitsize
= nunits
* BITS_PER_UNIT
;
2687 nelts
= CEIL (bitsize
, 32);
2688 units_per
= 32 / BITS_PER_UNIT
;
2690 real_to_target (data
, &d
, mode
);
2692 /* Put out the first word with the specified alignment. */
2693 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2694 nunits
-= units_per
;
2696 /* Subsequent words need only 32-bit alignment. */
2697 align
= min_align (align
, 32);
2699 for (i
= 1; i
< nelts
; i
++)
2701 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2702 nunits
-= units_per
;
2706 /* Given an expression EXP with a constant value,
2707 reduce it to the sum of an assembler symbol and an integer.
2708 Store them both in the structure *VALUE.
2709 EXP must be reducible. */
2713 HOST_WIDE_INT offset
;
2717 decode_addr_const (tree exp
, struct addr_const
*value
)
2719 tree target
= TREE_OPERAND (exp
, 0);
2725 if (TREE_CODE (target
) == COMPONENT_REF
2726 && tree_fits_shwi_p (byte_position (TREE_OPERAND (target
, 1))))
2728 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2729 target
= TREE_OPERAND (target
, 0);
2731 else if (TREE_CODE (target
) == ARRAY_REF
2732 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2734 offset
+= (tree_to_uhwi (TYPE_SIZE_UNIT (TREE_TYPE (target
)))
2735 * tree_to_shwi (TREE_OPERAND (target
, 1)));
2736 target
= TREE_OPERAND (target
, 0);
2738 else if (TREE_CODE (target
) == MEM_REF
2739 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2741 offset
+= mem_ref_offset (target
).low
;
2742 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2744 else if (TREE_CODE (target
) == INDIRECT_REF
2745 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2746 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2748 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2753 switch (TREE_CODE (target
))
2757 x
= DECL_RTL (target
);
2761 x
= gen_rtx_MEM (FUNCTION_MODE
,
2762 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2771 x
= output_constant_def (target
, 1);
2778 gcc_assert (MEM_P (x
));
2782 value
->offset
= offset
;
2786 static GTY((param_is (struct constant_descriptor_tree
)))
2787 htab_t const_desc_htab
;
2789 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2791 /* Constant pool accessor function. */
2794 constant_pool_htab (void)
2796 return const_desc_htab
;
2799 /* Compute a hash code for a constant expression. */
2802 const_desc_hash (const void *ptr
)
2804 return ((const struct constant_descriptor_tree
*)ptr
)->hash
;
2808 const_hash_1 (const tree exp
)
2813 enum tree_code code
= TREE_CODE (exp
);
2815 /* Either set P and LEN to the address and len of something to hash and
2816 exit the switch or return a value. */
2821 p
= (char *) &TREE_INT_CST (exp
);
2822 len
= sizeof TREE_INT_CST (exp
);
2826 return real_hash (TREE_REAL_CST_PTR (exp
));
2829 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2832 p
= TREE_STRING_POINTER (exp
);
2833 len
= TREE_STRING_LENGTH (exp
);
2837 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2838 + const_hash_1 (TREE_IMAGPART (exp
)));
2844 hi
= 7 + VECTOR_CST_NELTS (exp
);
2846 for (i
= 0; i
< VECTOR_CST_NELTS (exp
); ++i
)
2847 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ELT (exp
, i
));
2854 unsigned HOST_WIDE_INT idx
;
2857 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2859 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2861 hi
= hi
* 603 + const_hash_1 (value
);
2869 struct addr_const value
;
2871 decode_addr_const (exp
, &value
);
2872 switch (GET_CODE (value
.base
))
2875 /* Don't hash the address of the SYMBOL_REF;
2876 only use the offset and the symbol name. */
2878 p
= XSTR (value
.base
, 0);
2879 for (i
= 0; p
[i
] != 0; i
++)
2880 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2884 hi
= value
.offset
+ CODE_LABEL_NUMBER (XEXP (value
.base
, 0)) * 13;
2894 case POINTER_PLUS_EXPR
:
2896 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2897 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2900 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2903 /* A language specific constant. Just hash the code. */
2907 /* Compute hashing function. */
2909 for (i
= 0; i
< len
; i
++)
2910 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2915 /* Wrapper of compare_constant, for the htab interface. */
2917 const_desc_eq (const void *p1
, const void *p2
)
2919 const struct constant_descriptor_tree
*const c1
2920 = (const struct constant_descriptor_tree
*) p1
;
2921 const struct constant_descriptor_tree
*const c2
2922 = (const struct constant_descriptor_tree
*) p2
;
2923 if (c1
->hash
!= c2
->hash
)
2925 return compare_constant (c1
->value
, c2
->value
);
2928 /* Compare t1 and t2, and return 1 only if they are known to result in
2929 the same bit pattern on output. */
2932 compare_constant (const tree t1
, const tree t2
)
2934 enum tree_code typecode
;
2936 if (t1
== NULL_TREE
)
2937 return t2
== NULL_TREE
;
2938 if (t2
== NULL_TREE
)
2941 if (TREE_CODE (t1
) != TREE_CODE (t2
))
2944 switch (TREE_CODE (t1
))
2947 /* Integer constants are the same only if the same width of type. */
2948 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2950 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2952 return tree_int_cst_equal (t1
, t2
);
2955 /* Real constants are the same only if the same width of type. */
2956 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2959 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
2962 /* Fixed constants are the same only if the same width of type. */
2963 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2966 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
2969 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2972 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
2973 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
2974 TREE_STRING_LENGTH (t1
)));
2977 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
2978 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
2984 if (VECTOR_CST_NELTS (t1
) != VECTOR_CST_NELTS (t2
))
2987 for (i
= 0; i
< VECTOR_CST_NELTS (t1
); ++i
)
2988 if (!compare_constant (VECTOR_CST_ELT (t1
, i
),
2989 VECTOR_CST_ELT (t2
, i
)))
2997 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
2998 unsigned HOST_WIDE_INT idx
;
3000 typecode
= TREE_CODE (TREE_TYPE (t1
));
3001 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
3004 if (typecode
== ARRAY_TYPE
)
3006 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
3007 /* For arrays, check that the sizes all match. */
3008 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
3010 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
3015 /* For record and union constructors, require exact type
3017 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
3021 v1
= CONSTRUCTOR_ELTS (t1
);
3022 v2
= CONSTRUCTOR_ELTS (t2
);
3023 if (vec_safe_length (v1
) != vec_safe_length (v2
))
3026 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
3028 constructor_elt
*c1
= &(*v1
)[idx
];
3029 constructor_elt
*c2
= &(*v2
)[idx
];
3031 /* Check that each value is the same... */
3032 if (!compare_constant (c1
->value
, c2
->value
))
3034 /* ... and that they apply to the same fields! */
3035 if (typecode
== ARRAY_TYPE
)
3037 if (!compare_constant (c1
->index
, c2
->index
))
3042 if (c1
->index
!= c2
->index
)
3053 struct addr_const value1
, value2
;
3057 decode_addr_const (t1
, &value1
);
3058 decode_addr_const (t2
, &value2
);
3060 if (value1
.offset
!= value2
.offset
)
3063 code
= GET_CODE (value1
.base
);
3064 if (code
!= GET_CODE (value2
.base
))
3070 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3074 ret
= (CODE_LABEL_NUMBER (XEXP (value1
.base
, 0))
3075 == CODE_LABEL_NUMBER (XEXP (value2
.base
, 0)));
3085 case POINTER_PLUS_EXPR
:
3088 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3089 && compare_constant (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3092 case VIEW_CONVERT_EXPR
:
3093 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3102 /* Make a copy of the whole tree structure for a constant. This
3103 handles the same types of nodes that compare_constant handles. */
3106 copy_constant (tree exp
)
3108 switch (TREE_CODE (exp
))
3111 /* For ADDR_EXPR, we do not want to copy the decl whose address
3112 is requested. We do want to copy constants though. */
3113 if (CONSTANT_CLASS_P (TREE_OPERAND (exp
, 0)))
3114 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3115 copy_constant (TREE_OPERAND (exp
, 0)));
3117 return copy_node (exp
);
3123 return copy_node (exp
);
3126 return build_complex (TREE_TYPE (exp
),
3127 copy_constant (TREE_REALPART (exp
)),
3128 copy_constant (TREE_IMAGPART (exp
)));
3131 case POINTER_PLUS_EXPR
:
3133 return build2 (TREE_CODE (exp
), TREE_TYPE (exp
),
3134 copy_constant (TREE_OPERAND (exp
, 0)),
3135 copy_constant (TREE_OPERAND (exp
, 1)));
3138 case VIEW_CONVERT_EXPR
:
3139 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3140 copy_constant (TREE_OPERAND (exp
, 0)));
3143 return build_vector (TREE_TYPE (exp
), VECTOR_CST_ELTS (exp
));
3147 tree copy
= copy_node (exp
);
3148 vec
<constructor_elt
, va_gc
> *v
;
3149 unsigned HOST_WIDE_INT idx
;
3150 tree purpose
, value
;
3152 vec_alloc (v
, vec_safe_length (CONSTRUCTOR_ELTS (exp
)));
3153 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp
), idx
, purpose
, value
)
3155 constructor_elt ce
= {purpose
, copy_constant (value
)};
3158 CONSTRUCTOR_ELTS (copy
) = v
;
3167 /* Return the section into which constant EXP should be placed. */
3170 get_constant_section (tree exp
, unsigned int align
)
3172 return targetm
.asm_out
.select_section (exp
,
3173 compute_reloc_for_constant (exp
),
3177 /* Return the size of constant EXP in bytes. */
3179 static HOST_WIDE_INT
3180 get_constant_size (tree exp
)
3184 size
= int_size_in_bytes (TREE_TYPE (exp
));
3185 if (TREE_CODE (exp
) == STRING_CST
)
3186 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3190 /* Subroutine of output_constant_def:
3191 No constant equal to EXP is known to have been output.
3192 Make a constant descriptor to enter EXP in the hash table.
3193 Assign the label number and construct RTL to refer to the
3194 constant's location in memory.
3195 Caller is responsible for updating the hash table. */
3197 static struct constant_descriptor_tree
*
3198 build_constant_desc (tree exp
)
3200 struct constant_descriptor_tree
*desc
;
3206 desc
= ggc_alloc_constant_descriptor_tree ();
3207 desc
->value
= copy_constant (exp
);
3209 /* Create a string containing the label name, in LABEL. */
3210 labelno
= const_labelno
++;
3211 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3213 /* Construct the VAR_DECL associated with the constant. */
3214 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3216 DECL_ARTIFICIAL (decl
) = 1;
3217 DECL_IGNORED_P (decl
) = 1;
3218 TREE_READONLY (decl
) = 1;
3219 TREE_STATIC (decl
) = 1;
3220 TREE_ADDRESSABLE (decl
) = 1;
3221 /* We don't set the RTL yet as this would cause varpool to assume that the
3222 variable is referenced. Moreover, it would just be dropped in LTO mode.
3223 Instead we set the flag that will be recognized in make_decl_rtl. */
3224 DECL_IN_CONSTANT_POOL (decl
) = 1;
3225 DECL_INITIAL (decl
) = desc
->value
;
3226 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3227 architectures so use DATA_ALIGNMENT as well, except for strings. */
3228 if (TREE_CODE (exp
) == STRING_CST
)
3230 #ifdef CONSTANT_ALIGNMENT
3231 DECL_ALIGN (decl
) = CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
));
3235 align_variable (decl
, 0);
3237 /* Now construct the SYMBOL_REF and the MEM. */
3238 if (use_object_blocks_p ())
3240 section
*sect
= get_constant_section (exp
, DECL_ALIGN (decl
));
3241 symbol
= create_block_symbol (ggc_strdup (label
),
3242 get_block_for_section (sect
), -1);
3245 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3246 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3247 SET_SYMBOL_REF_DECL (symbol
, decl
);
3248 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3250 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3251 set_mem_attributes (rtl
, exp
, 1);
3252 set_mem_alias_set (rtl
, 0);
3253 set_mem_alias_set (rtl
, const_alias_set
);
3255 /* We cannot share RTX'es in pool entries.
3256 Mark this piece of RTL as required for unsharing. */
3257 RTX_FLAG (rtl
, used
) = 1;
3259 /* Set flags or add text to the name to record information, such as
3260 that it is a local symbol. If the name is changed, the macro
3261 ASM_OUTPUT_LABELREF will have to know how to strip this
3262 information. This call might invalidate our local variable
3263 SYMBOL; we can't use it afterward. */
3264 targetm
.encode_section_info (exp
, rtl
, true);
3271 /* Return an rtx representing a reference to constant data in memory
3272 for the constant expression EXP.
3274 If assembler code for such a constant has already been output,
3275 return an rtx to refer to it.
3276 Otherwise, output such a constant in memory
3277 and generate an rtx for it.
3279 If DEFER is nonzero, this constant can be deferred and output only
3280 if referenced in the function after all optimizations.
3282 `const_desc_table' records which constants already have label strings. */
3285 output_constant_def (tree exp
, int defer
)
3287 struct constant_descriptor_tree
*desc
;
3288 struct constant_descriptor_tree key
;
3291 /* Look up EXP in the table of constant descriptors. If we didn't find
3292 it, create a new one. */
3294 key
.hash
= const_hash_1 (exp
);
3295 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3297 desc
= (struct constant_descriptor_tree
*) *loc
;
3300 desc
= build_constant_desc (exp
);
3301 desc
->hash
= key
.hash
;
3305 maybe_output_constant_def_contents (desc
, defer
);
3309 /* Subroutine of output_constant_def: Decide whether or not we need to
3310 output the constant DESC now, and if so, do it. */
3312 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3315 rtx symbol
= XEXP (desc
->rtl
, 0);
3316 tree exp
= desc
->value
;
3318 if (flag_syntax_only
)
3321 if (TREE_ASM_WRITTEN (exp
))
3322 /* Already output; don't do it again. */
3325 /* We can always defer constants as long as the context allows
3329 /* Increment n_deferred_constants if it exists. It needs to be at
3330 least as large as the number of constants actually referred to
3331 by the function. If it's too small we'll stop looking too early
3332 and fail to emit constants; if it's too large we'll only look
3333 through the entire function when we could have stopped earlier. */
3335 n_deferred_constants
++;
3339 output_constant_def_contents (symbol
);
3342 /* Subroutine of output_constant_def_contents. Output the definition
3343 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3344 constant's alignment in bits. */
3347 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3351 size
= get_constant_size (exp
);
3353 /* Do any machine/system dependent processing of the constant. */
3354 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3356 /* Output the value of EXP. */
3357 output_constant (exp
, size
, align
);
3360 /* We must output the constant data referred to by SYMBOL; do so. */
3363 output_constant_def_contents (rtx symbol
)
3365 tree decl
= SYMBOL_REF_DECL (symbol
);
3366 tree exp
= DECL_INITIAL (decl
);
3368 bool asan_protected
= false;
3370 /* Make sure any other constants whose addresses appear in EXP
3371 are assigned label numbers. */
3372 output_addressed_constants (exp
);
3374 /* We are no longer deferring this constant. */
3375 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3377 if ((flag_sanitize
& SANITIZE_ADDRESS
)
3378 && TREE_CODE (exp
) == STRING_CST
3379 && asan_protect_global (exp
))
3381 asan_protected
= true;
3382 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
3383 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
3386 /* If the constant is part of an object block, make sure that the
3387 decl has been positioned within its block, but do not write out
3388 its definition yet. output_object_blocks will do that later. */
3389 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3390 place_block_symbol (symbol
);
3393 align
= DECL_ALIGN (decl
);
3394 switch_to_section (get_constant_section (exp
, align
));
3395 if (align
> BITS_PER_UNIT
)
3396 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3397 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3400 HOST_WIDE_INT size
= get_constant_size (exp
);
3401 assemble_zeros (asan_red_zone_size (size
));
3406 /* Look up EXP in the table of constant descriptors. Return the rtl
3407 if it has been emitted, else null. */
3410 lookup_constant_def (tree exp
)
3412 struct constant_descriptor_tree
*desc
;
3413 struct constant_descriptor_tree key
;
3416 key
.hash
= const_hash_1 (exp
);
3417 desc
= (struct constant_descriptor_tree
*)
3418 htab_find_with_hash (const_desc_htab
, &key
, key
.hash
);
3420 return (desc
? desc
->rtl
: NULL_RTX
);
3423 /* Return a tree representing a reference to constant data in memory
3424 for the constant expression EXP.
3426 This is the counterpart of output_constant_def at the Tree level. */
3429 tree_output_constant_def (tree exp
)
3431 struct constant_descriptor_tree
*desc
, key
;
3435 /* Look up EXP in the table of constant descriptors. If we didn't find
3436 it, create a new one. */
3438 key
.hash
= const_hash_1 (exp
);
3439 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3441 desc
= (struct constant_descriptor_tree
*) *loc
;
3444 desc
= build_constant_desc (exp
);
3445 desc
->hash
= key
.hash
;
3449 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3450 varpool_finalize_decl (decl
);
3454 /* Used in the hash tables to avoid outputting the same constant
3455 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3456 are output once per function, not once per file. */
3457 /* ??? Only a few targets need per-function constant pools. Most
3458 can use one per-file pool. Should add a targetm bit to tell the
3461 struct GTY(()) rtx_constant_pool
{
3462 /* Pointers to first and last constant in pool, as ordered by offset. */
3463 struct constant_descriptor_rtx
*first
;
3464 struct constant_descriptor_rtx
*last
;
3466 /* Hash facility for making memory-constants from constant rtl-expressions.
3467 It is used on RISC machines where immediate integer arguments and
3468 constant addresses are restricted so that such constants must be stored
3470 htab_t
GTY((param_is (struct constant_descriptor_rtx
))) const_rtx_htab
;
3472 /* Current offset in constant pool (does not include any
3473 machine-specific header). */
3474 HOST_WIDE_INT offset
;
3477 struct GTY((chain_next ("%h.next"))) constant_descriptor_rtx
{
3478 struct constant_descriptor_rtx
*next
;
3482 HOST_WIDE_INT offset
;
3484 enum machine_mode mode
;
3490 /* Hash and compare functions for const_rtx_htab. */
3493 const_desc_rtx_hash (const void *ptr
)
3495 const struct constant_descriptor_rtx
*const desc
3496 = (const struct constant_descriptor_rtx
*) ptr
;
3501 const_desc_rtx_eq (const void *a
, const void *b
)
3503 const struct constant_descriptor_rtx
*const x
3504 = (const struct constant_descriptor_rtx
*) a
;
3505 const struct constant_descriptor_rtx
*const y
3506 = (const struct constant_descriptor_rtx
*) b
;
3508 if (x
->mode
!= y
->mode
)
3510 return rtx_equal_p (x
->constant
, y
->constant
);
3513 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3516 const_rtx_hash_1 (rtx
*xp
, void *data
)
3518 unsigned HOST_WIDE_INT hwi
;
3519 enum machine_mode mode
;
3525 code
= GET_CODE (x
);
3526 mode
= GET_MODE (x
);
3527 h
= (hashval_t
) code
* 1048573 + mode
;
3535 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3536 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3539 h
^= (hashval_t
) hwi
;
3540 for (i
= 1; i
< n
; ++i
)
3543 h
^= (hashval_t
) hwi
;
3549 if (mode
== VOIDmode
)
3551 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3555 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3559 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3565 for (i
= XVECLEN (x
, 0); i
-- > 0; )
3566 h
= h
* 251 + const_rtx_hash_1 (&XVECEXP (x
, 0, i
), data
);
3571 h
^= htab_hash_string (XSTR (x
, 0));
3575 h
= h
* 251 + CODE_LABEL_NUMBER (XEXP (x
, 0));
3579 case UNSPEC_VOLATILE
:
3580 h
= h
* 251 + XINT (x
, 1);
3587 hp
= (hashval_t
*) data
;
3588 *hp
= *hp
* 509 + h
;
3592 /* Compute a hash value for X, which should be a constant. */
3595 const_rtx_hash (rtx x
)
3598 for_each_rtx (&x
, const_rtx_hash_1
, &h
);
3603 /* Create and return a new rtx constant pool. */
3605 static struct rtx_constant_pool
*
3606 create_constant_pool (void)
3608 struct rtx_constant_pool
*pool
;
3610 pool
= ggc_alloc_rtx_constant_pool ();
3611 pool
->const_rtx_htab
= htab_create_ggc (31, const_desc_rtx_hash
,
3612 const_desc_rtx_eq
, NULL
);
3619 /* Initialize constant pool hashing for a new function. */
3622 init_varasm_status (void)
3624 crtl
->varasm
.pool
= create_constant_pool ();
3625 crtl
->varasm
.deferred_constants
= 0;
3628 /* Given a MINUS expression, simplify it if both sides
3629 include the same symbol. */
3632 simplify_subtraction (rtx x
)
3634 rtx r
= simplify_rtx (x
);
3638 /* Given a constant rtx X, make (or find) a memory constant for its value
3639 and return a MEM rtx to refer to it in memory. */
3642 force_const_mem (enum machine_mode mode
, rtx x
)
3644 struct constant_descriptor_rtx
*desc
, tmp
;
3645 struct rtx_constant_pool
*pool
;
3652 /* If we're not allowed to drop X into the constant pool, don't. */
3653 if (targetm
.cannot_force_const_mem (mode
, x
))
3656 /* Record that this function has used a constant pool entry. */
3657 crtl
->uses_const_pool
= 1;
3659 /* Decide which pool to use. */
3660 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3661 ? shared_constant_pool
3662 : crtl
->varasm
.pool
);
3664 /* Lookup the value in the hashtable. */
3667 hash
= const_rtx_hash (x
);
3668 slot
= htab_find_slot_with_hash (pool
->const_rtx_htab
, &tmp
, hash
, INSERT
);
3669 desc
= (struct constant_descriptor_rtx
*) *slot
;
3671 /* If the constant was already present, return its memory. */
3673 return copy_rtx (desc
->mem
);
3675 /* Otherwise, create a new descriptor. */
3676 desc
= ggc_alloc_constant_descriptor_rtx ();
3679 /* Align the location counter as required by EXP's data type. */
3680 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3681 #ifdef CONSTANT_ALIGNMENT
3683 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3684 if (type
!= NULL_TREE
)
3685 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3689 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3690 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3693 desc
->constant
= copy_rtx (tmp
.constant
);
3694 desc
->offset
= pool
->offset
;
3697 desc
->align
= align
;
3698 desc
->labelno
= const_labelno
;
3701 pool
->offset
+= GET_MODE_SIZE (mode
);
3703 pool
->last
->next
= desc
;
3705 pool
->first
= pool
->last
= desc
;
3708 /* Create a string containing the label name, in LABEL. */
3709 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3712 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3713 the constants pool. */
3714 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3716 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3717 symbol
= create_block_symbol (ggc_strdup (label
),
3718 get_block_for_section (sect
), -1);
3721 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3723 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3724 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3725 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3727 /* Construct the MEM. */
3728 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3729 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3730 set_mem_align (def
, align
);
3732 /* If we're dropping a label to the constant pool, make sure we
3734 if (GET_CODE (x
) == LABEL_REF
)
3735 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3737 return copy_rtx (def
);
3740 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3743 get_pool_constant (rtx addr
)
3745 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3748 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3749 and whether it has been output or not. */
3752 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3754 struct constant_descriptor_rtx
*desc
;
3756 desc
= SYMBOL_REF_CONSTANT (addr
);
3757 *pmarked
= (desc
->mark
!= 0);
3758 return desc
->constant
;
3761 /* Similar, return the mode. */
3764 get_pool_mode (const_rtx addr
)
3766 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3769 /* Return the size of the constant pool. */
3772 get_pool_size (void)
3774 return crtl
->varasm
.pool
->offset
;
3777 /* Worker function for output_constant_pool_1. Emit assembly for X
3778 in MODE with known alignment ALIGN. */
3781 output_constant_pool_2 (enum machine_mode mode
, rtx x
, unsigned int align
)
3783 switch (GET_MODE_CLASS (mode
))
3786 case MODE_DECIMAL_FLOAT
:
3790 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3791 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3792 assemble_real (r
, mode
, align
);
3797 case MODE_PARTIAL_INT
:
3802 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3805 case MODE_VECTOR_FLOAT
:
3806 case MODE_VECTOR_INT
:
3807 case MODE_VECTOR_FRACT
:
3808 case MODE_VECTOR_UFRACT
:
3809 case MODE_VECTOR_ACCUM
:
3810 case MODE_VECTOR_UACCUM
:
3813 enum machine_mode submode
= GET_MODE_INNER (mode
);
3814 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3816 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3817 units
= CONST_VECTOR_NUNITS (x
);
3819 for (i
= 0; i
< units
; i
++)
3821 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3822 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3832 /* Worker function for output_constant_pool. Emit constant DESC,
3833 giving it ALIGN bits of alignment. */
3836 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3843 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3844 whose CODE_LABEL has been deleted. This can occur if a jump table
3845 is eliminated by optimization. If so, write a constant of zero
3846 instead. Note that this can also happen by turning the
3847 CODE_LABEL into a NOTE. */
3848 /* ??? This seems completely and utterly wrong. Certainly it's
3849 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3850 functioning even with INSN_DELETED_P and friends. */
3853 switch (GET_CODE (tmp
))
3856 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3857 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3859 tmp
= XEXP (XEXP (tmp
, 0), 0);
3863 tmp
= XEXP (tmp
, 0);
3864 gcc_assert (!INSN_DELETED_P (tmp
));
3865 gcc_assert (!NOTE_P (tmp
)
3866 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3873 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3874 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3875 align
, desc
->labelno
, done
);
3878 assemble_align (align
);
3880 /* Output the label. */
3881 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3883 /* Output the data. */
3884 output_constant_pool_2 (desc
->mode
, x
, align
);
3886 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3887 sections have proper size. */
3888 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3890 && (in_section
->common
.flags
& SECTION_MERGE
))
3891 assemble_align (align
);
3893 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3899 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3900 to as used. Emit referenced deferred strings. This function can
3901 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3904 mark_constant (rtx
*current_rtx
, void *data ATTRIBUTE_UNUSED
)
3906 rtx x
= *current_rtx
;
3908 if (x
== NULL_RTX
|| GET_CODE (x
) != SYMBOL_REF
)
3911 if (CONSTANT_POOL_ADDRESS_P (x
))
3913 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3914 if (desc
->mark
== 0)
3917 for_each_rtx (&desc
->constant
, mark_constant
, NULL
);
3920 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3922 tree decl
= SYMBOL_REF_DECL (x
);
3923 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
3925 n_deferred_constants
--;
3926 output_constant_def_contents (x
);
3933 /* Look through appropriate parts of INSN, marking all entries in the
3934 constant pool which are actually being used. Entries that are only
3935 referenced by other constants are also marked as used. Emit
3936 deferred strings that are used. */
3939 mark_constants (rtx insn
)
3944 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3945 insns, not any notes that may be attached. We don't want to mark
3946 a constant just because it happens to appear in a REG_EQUIV note. */
3947 if (GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3949 rtx seq
= PATTERN (insn
);
3950 int i
, n
= XVECLEN (seq
, 0);
3951 for (i
= 0; i
< n
; ++i
)
3953 rtx subinsn
= XVECEXP (seq
, 0, i
);
3954 if (INSN_P (subinsn
))
3955 for_each_rtx (&PATTERN (subinsn
), mark_constant
, NULL
);
3959 for_each_rtx (&PATTERN (insn
), mark_constant
, NULL
);
3962 /* Look through the instructions for this function, and mark all the
3963 entries in POOL which are actually being used. Emit deferred constants
3964 which have indeed been used. */
3967 mark_constant_pool (void)
3971 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
3974 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3975 mark_constants (insn
);
3978 /* Write all the constants in POOL. */
3981 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
3983 struct constant_descriptor_rtx
*desc
;
3985 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3988 /* If the constant is part of an object_block, make sure that
3989 the constant has been positioned within its block, but do not
3990 write out its definition yet. output_object_blocks will do
3992 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
3993 && SYMBOL_REF_BLOCK (desc
->sym
))
3994 place_block_symbol (desc
->sym
);
3997 switch_to_section (targetm
.asm_out
.select_rtx_section
3998 (desc
->mode
, desc
->constant
, desc
->align
));
3999 output_constant_pool_1 (desc
, desc
->align
);
4004 /* Mark all constants that are used in the current function, then write
4005 out the function's private constant pool. */
4008 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
4009 tree fndecl ATTRIBUTE_UNUSED
)
4011 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
4013 /* It is possible for gcc to call force_const_mem and then to later
4014 discard the instructions which refer to the constant. In such a
4015 case we do not need to output the constant. */
4016 mark_constant_pool ();
4018 #ifdef ASM_OUTPUT_POOL_PROLOGUE
4019 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4022 output_constant_pool_contents (pool
);
4024 #ifdef ASM_OUTPUT_POOL_EPILOGUE
4025 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4029 /* Write the contents of the shared constant pool. */
4032 output_shared_constant_pool (void)
4034 output_constant_pool_contents (shared_constant_pool
);
4037 /* Determine what kind of relocations EXP may need. */
4040 compute_reloc_for_constant (tree exp
)
4042 int reloc
= 0, reloc2
;
4045 switch (TREE_CODE (exp
))
4049 /* Go inside any operations that get_inner_reference can handle and see
4050 if what's inside is a constant: no need to do anything here for
4051 addresses of variables or functions. */
4052 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4053 tem
= TREE_OPERAND (tem
, 0))
4056 if (TREE_CODE (tem
) == MEM_REF
4057 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
4059 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
4063 if (TREE_PUBLIC (tem
))
4070 case POINTER_PLUS_EXPR
:
4071 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4072 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4076 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4077 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4078 /* The difference of two local labels is computable at link time. */
4079 if (reloc
== 1 && reloc2
== 1)
4086 case VIEW_CONVERT_EXPR
:
4087 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4092 unsigned HOST_WIDE_INT idx
;
4093 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4095 reloc
|= compute_reloc_for_constant (tem
);
4105 /* Find all the constants whose addresses are referenced inside of EXP,
4106 and make sure assembler code with a label has been output for each one.
4107 Indicate whether an ADDR_EXPR has been encountered. */
4110 output_addressed_constants (tree exp
)
4114 switch (TREE_CODE (exp
))
4118 /* Go inside any operations that get_inner_reference can handle and see
4119 if what's inside is a constant: no need to do anything here for
4120 addresses of variables or functions. */
4121 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4122 tem
= TREE_OPERAND (tem
, 0))
4125 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4126 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4127 tem
= DECL_INITIAL (tem
);
4129 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4130 output_constant_def (tem
, 0);
4132 if (TREE_CODE (tem
) == MEM_REF
)
4133 output_addressed_constants (TREE_OPERAND (tem
, 0));
4137 case POINTER_PLUS_EXPR
:
4139 output_addressed_constants (TREE_OPERAND (exp
, 1));
4143 case VIEW_CONVERT_EXPR
:
4144 output_addressed_constants (TREE_OPERAND (exp
, 0));
4149 unsigned HOST_WIDE_INT idx
;
4150 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4152 output_addressed_constants (tem
);
4161 /* Whether a constructor CTOR is a valid static constant initializer if all
4162 its elements are. This used to be internal to initializer_constant_valid_p
4163 and has been exposed to let other functions like categorize_ctor_elements
4164 evaluate the property while walking a constructor for other purposes. */
4167 constructor_static_from_elts_p (const_tree ctor
)
4169 return (TREE_CONSTANT (ctor
)
4170 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4171 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4172 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4175 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4178 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4179 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4180 which are valid when ENDTYPE is an integer of any size; in
4181 particular, this does not accept a pointer minus a constant. This
4182 returns null_pointer_node if the VALUE is an absolute constant
4183 which can be used to initialize a static variable. Otherwise it
4187 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4191 if (!INTEGRAL_TYPE_P (endtype
))
4194 op0
= TREE_OPERAND (value
, 0);
4195 op1
= TREE_OPERAND (value
, 1);
4197 /* Like STRIP_NOPS except allow the operand mode to widen. This
4198 works around a feature of fold that simplifies (int)(p1 - p2) to
4199 ((int)p1 - (int)p2) under the theory that the narrower operation
4202 while (CONVERT_EXPR_P (op0
)
4203 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4205 tree inner
= TREE_OPERAND (op0
, 0);
4206 if (inner
== error_mark_node
4207 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4208 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4209 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4214 while (CONVERT_EXPR_P (op1
)
4215 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4217 tree inner
= TREE_OPERAND (op1
, 0);
4218 if (inner
== error_mark_node
4219 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4220 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4221 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4226 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4230 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4231 cache
? cache
+ 2 : NULL
);
4232 /* Both initializers must be known. */
4236 && (op0
== null_pointer_node
4237 || TREE_CODE (value
) == MINUS_EXPR
))
4238 return null_pointer_node
;
4240 /* Support differences between labels. */
4241 if (TREE_CODE (op0
) == LABEL_DECL
4242 && TREE_CODE (op1
) == LABEL_DECL
)
4243 return null_pointer_node
;
4245 if (TREE_CODE (op0
) == STRING_CST
4246 && TREE_CODE (op1
) == STRING_CST
4247 && operand_equal_p (op0
, op1
, 1))
4248 return null_pointer_node
;
4254 /* Helper function of initializer_constant_valid_p.
4255 Return nonzero if VALUE is a valid constant-valued expression
4256 for use in initializing a static variable; one that can be an
4257 element of a "constant" initializer.
4259 Return null_pointer_node if the value is absolute;
4260 if it is relocatable, return the variable that determines the relocation.
4261 We assume that VALUE has been folded as much as possible;
4262 therefore, we do not need to check for such things as
4263 arithmetic-combinations of integers.
4265 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4268 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4272 switch (TREE_CODE (value
))
4275 if (constructor_static_from_elts_p (value
))
4277 unsigned HOST_WIDE_INT idx
;
4279 bool absolute
= true;
4281 if (cache
&& cache
[0] == value
)
4283 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4286 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4293 cache
[1] = NULL_TREE
;
4297 if (reloc
!= null_pointer_node
)
4300 /* For a non-absolute relocation, there is no single
4301 variable that can be "the variable that determines the
4306 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4308 return absolute
? null_pointer_node
: error_mark_node
;
4311 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4319 return null_pointer_node
;
4324 tree op0
= staticp (TREE_OPERAND (value
, 0));
4327 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4328 to be a constant, this is old-skool offsetof-like nonsense. */
4329 if (TREE_CODE (op0
) == INDIRECT_REF
4330 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4331 return null_pointer_node
;
4332 /* Taking the address of a nested function involves a trampoline,
4333 unless we don't need or want one. */
4334 if (TREE_CODE (op0
) == FUNCTION_DECL
4335 && DECL_STATIC_CHAIN (op0
)
4336 && !TREE_NO_TRAMPOLINE (value
))
4338 /* "&{...}" requires a temporary to hold the constructed
4340 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4346 case NON_LVALUE_EXPR
:
4347 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4350 case VIEW_CONVERT_EXPR
:
4352 tree src
= TREE_OPERAND (value
, 0);
4353 tree src_type
= TREE_TYPE (src
);
4354 tree dest_type
= TREE_TYPE (value
);
4356 /* Allow view-conversions from aggregate to non-aggregate type only
4357 if the bit pattern is fully preserved afterwards; otherwise, the
4358 RTL expander won't be able to apply a subsequent transformation
4359 to the underlying constructor. */
4360 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4362 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4363 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4368 /* Allow all other kinds of view-conversion. */
4369 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4374 tree src
= TREE_OPERAND (value
, 0);
4375 tree src_type
= TREE_TYPE (src
);
4376 tree dest_type
= TREE_TYPE (value
);
4378 /* Allow conversions between pointer types, floating-point
4379 types, and offset types. */
4380 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4381 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4382 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4383 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4384 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4386 /* Allow length-preserving conversions between integer types. */
4387 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4388 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4389 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4391 /* Allow conversions between other integer types only if
4393 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4395 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4396 if (inner
== null_pointer_node
)
4397 return null_pointer_node
;
4401 /* Allow (int) &foo provided int is as wide as a pointer. */
4402 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4403 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4404 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4406 /* Likewise conversions from int to pointers, but also allow
4407 conversions from 0. */
4408 if ((POINTER_TYPE_P (dest_type
)
4409 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4410 && INTEGRAL_TYPE_P (src_type
))
4412 if (TREE_CODE (src
) == INTEGER_CST
4413 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4414 return null_pointer_node
;
4415 if (integer_zerop (src
))
4416 return null_pointer_node
;
4417 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4418 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4421 /* Allow conversions to struct or union types if the value
4423 if (TREE_CODE (dest_type
) == RECORD_TYPE
4424 || TREE_CODE (dest_type
) == UNION_TYPE
)
4425 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4429 case POINTER_PLUS_EXPR
:
4431 /* Any valid floating-point constants will have been folded by now;
4432 with -frounding-math we hit this with addition of two constants. */
4433 if (TREE_CODE (endtype
) == REAL_TYPE
)
4435 if (cache
&& cache
[0] == value
)
4437 if (! INTEGRAL_TYPE_P (endtype
)
4438 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4440 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4442 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4445 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4446 endtype
, ncache
+ 2);
4447 /* If either term is absolute, use the other term's relocation. */
4448 if (valid0
== null_pointer_node
)
4450 else if (valid1
== null_pointer_node
)
4452 /* Support narrowing pointer differences. */
4454 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4458 /* Support narrowing pointer differences. */
4459 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4468 if (TREE_CODE (endtype
) == REAL_TYPE
)
4470 if (cache
&& cache
[0] == value
)
4472 if (! INTEGRAL_TYPE_P (endtype
)
4473 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4475 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4477 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4480 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4481 endtype
, ncache
+ 2);
4482 /* Win if second argument is absolute. */
4483 if (valid1
== null_pointer_node
)
4485 /* Win if both arguments have the same relocation.
4486 Then the value is absolute. */
4487 else if (valid0
== valid1
&& valid0
!= 0)
4488 ret
= null_pointer_node
;
4489 /* Since GCC guarantees that string constants are unique in the
4490 generated code, a subtraction between two copies of the same
4491 constant string is absolute. */
4492 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4493 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4494 && operand_equal_p (valid0
, valid1
, 1))
4495 ret
= null_pointer_node
;
4496 /* Support narrowing differences. */
4498 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4502 /* Support narrowing differences. */
4503 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4518 /* Return nonzero if VALUE is a valid constant-valued expression
4519 for use in initializing a static variable; one that can be an
4520 element of a "constant" initializer.
4522 Return null_pointer_node if the value is absolute;
4523 if it is relocatable, return the variable that determines the relocation.
4524 We assume that VALUE has been folded as much as possible;
4525 therefore, we do not need to check for such things as
4526 arithmetic-combinations of integers. */
4528 initializer_constant_valid_p (tree value
, tree endtype
)
4530 return initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4533 /* Return true if VALUE is a valid constant-valued expression
4534 for use in initializing a static bit-field; one that can be
4535 an element of a "constant" initializer. */
4538 initializer_constant_valid_for_bitfield_p (tree value
)
4540 /* For bitfields we support integer constants or possibly nested aggregates
4542 switch (TREE_CODE (value
))
4546 unsigned HOST_WIDE_INT idx
;
4549 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4550 if (!initializer_constant_valid_for_bitfield_p (elt
))
4559 case VIEW_CONVERT_EXPR
:
4560 case NON_LVALUE_EXPR
:
4562 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4571 /* output_constructor outer state of relevance in recursive calls, typically
4572 for nested aggregate bitfields. */
4575 unsigned int bit_offset
; /* current position in ... */
4576 int byte
; /* ... the outer byte buffer. */
4579 static unsigned HOST_WIDE_INT
4580 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int,
4583 /* Output assembler code for constant EXP, with no label.
4584 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4585 Assumes output_addressed_constants has been done on EXP already.
4587 Generate exactly SIZE bytes of assembler data, padding at the end
4588 with zeros if necessary. SIZE must always be specified.
4590 SIZE is important for structure constructors,
4591 since trailing members may have been omitted from the constructor.
4592 It is also important for initialization of arrays from string constants
4593 since the full length of the string constant might not be wanted.
4594 It is also needed for initialization of unions, where the initializer's
4595 type is just one member, and that may not be as long as the union.
4597 There a case in which we would fail to output exactly SIZE bytes:
4598 for a structure constructor that wants to produce more than SIZE bytes.
4599 But such constructors will never be generated for any possible input.
4601 ALIGN is the alignment of the data in bits. */
4604 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4606 enum tree_code code
;
4607 unsigned HOST_WIDE_INT thissize
;
4609 if (size
== 0 || flag_syntax_only
)
4612 /* See if we're trying to initialize a pointer in a non-default mode
4613 to the address of some declaration somewhere. If the target says
4614 the mode is valid for pointers, assume the target has a way of
4616 if (TREE_CODE (exp
) == NOP_EXPR
4617 && POINTER_TYPE_P (TREE_TYPE (exp
))
4618 && targetm
.addr_space
.valid_pointer_mode
4619 (TYPE_MODE (TREE_TYPE (exp
)),
4620 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4622 tree saved_type
= TREE_TYPE (exp
);
4624 /* Peel off any intermediate conversions-to-pointer for valid
4626 while (TREE_CODE (exp
) == NOP_EXPR
4627 && POINTER_TYPE_P (TREE_TYPE (exp
))
4628 && targetm
.addr_space
.valid_pointer_mode
4629 (TYPE_MODE (TREE_TYPE (exp
)),
4630 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4631 exp
= TREE_OPERAND (exp
, 0);
4633 /* If what we're left with is the address of something, we can
4634 convert the address to the final type and output it that
4636 if (TREE_CODE (exp
) == ADDR_EXPR
)
4637 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4638 /* Likewise for constant ints. */
4639 else if (TREE_CODE (exp
) == INTEGER_CST
)
4640 exp
= build_int_cst_wide (saved_type
, TREE_INT_CST_LOW (exp
),
4641 TREE_INT_CST_HIGH (exp
));
4645 /* Eliminate any conversions since we'll be outputting the underlying
4647 while (CONVERT_EXPR_P (exp
)
4648 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4649 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4651 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4652 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4654 /* Make sure eliminating the conversion is really a no-op, except with
4655 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4656 union types to allow for Ada unchecked unions. */
4657 if (type_size
> op_size
4658 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4659 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4660 /* Keep the conversion. */
4663 exp
= TREE_OPERAND (exp
, 0);
4666 code
= TREE_CODE (TREE_TYPE (exp
));
4667 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4669 /* Allow a constructor with no elements for any data type.
4670 This means to fill the space with zeros. */
4671 if (TREE_CODE (exp
) == CONSTRUCTOR
4672 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4674 assemble_zeros (size
);
4678 if (TREE_CODE (exp
) == FDESC_EXPR
)
4680 #ifdef ASM_OUTPUT_FDESC
4681 HOST_WIDE_INT part
= tree_to_shwi (TREE_OPERAND (exp
, 1));
4682 tree decl
= TREE_OPERAND (exp
, 0);
4683 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4690 /* Now output the underlying data. If we've handling the padding, return.
4691 Otherwise, break and ensure SIZE is the size written. */
4698 case REFERENCE_TYPE
:
4700 case FIXED_POINT_TYPE
:
4702 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4703 EXPAND_INITIALIZER
),
4704 MIN (size
, thissize
), align
, 0))
4705 error ("initializer for integer/fixed-point value is too complicated");
4709 if (TREE_CODE (exp
) != REAL_CST
)
4710 error ("initializer for floating value is not a floating constant");
4712 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4716 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4717 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4718 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4723 switch (TREE_CODE (exp
))
4726 output_constructor (exp
, size
, align
, NULL
);
4730 = MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
), size
);
4731 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4735 enum machine_mode inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4736 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4737 int elt_size
= GET_MODE_SIZE (inner
);
4738 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
);
4739 thissize
= elt_size
;
4740 for (unsigned int i
= 1; i
< VECTOR_CST_NELTS (exp
); i
++)
4742 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
);
4743 thissize
+= elt_size
;
4754 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4755 output_constructor (exp
, size
, align
, NULL
);
4765 if (size
> thissize
)
4766 assemble_zeros (size
- thissize
);
4770 /* Subroutine of output_constructor, used for computing the size of
4771 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4772 type with an unspecified upper bound. */
4774 static unsigned HOST_WIDE_INT
4775 array_size_for_constructor (tree val
)
4778 unsigned HOST_WIDE_INT cnt
;
4779 tree index
, value
, tmp
;
4782 /* This code used to attempt to handle string constants that are not
4783 arrays of single-bytes, but nothing else does, so there's no point in
4785 if (TREE_CODE (val
) == STRING_CST
)
4786 return TREE_STRING_LENGTH (val
);
4788 max_index
= NULL_TREE
;
4789 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4791 if (TREE_CODE (index
) == RANGE_EXPR
)
4792 index
= TREE_OPERAND (index
, 1);
4793 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4797 if (max_index
== NULL_TREE
)
4800 /* Compute the total number of array elements. */
4801 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4802 i
= tree_to_double_int (max_index
) - tree_to_double_int (tmp
);
4803 i
+= double_int_one
;
4805 /* Multiply by the array element unit size to find number of bytes. */
4806 i
*= tree_to_double_int (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4808 gcc_assert (i
.fits_uhwi ());
4812 /* Other datastructures + helpers for output_constructor. */
4814 /* output_constructor local state to support interaction with helpers. */
4818 /* Received arguments. */
4819 tree exp
; /* Constructor expression. */
4820 tree type
; /* Type of constructor expression. */
4821 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4822 unsigned int align
; /* Known initial alignment. */
4823 tree min_index
; /* Lower bound if specified for an array. */
4825 /* Output processing state. */
4826 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4827 int byte
; /* Part of a bitfield byte yet to be output. */
4828 int last_relative_index
; /* Implicit or explicit index of the last
4829 array element output within a bitfield. */
4830 bool byte_buffer_in_use
; /* Whether BYTE is in use. */
4832 /* Current element. */
4833 tree field
; /* Current field decl in a record. */
4834 tree val
; /* Current element value. */
4835 tree index
; /* Current element index. */
4839 /* Helper for output_constructor. From the current LOCAL state, output a
4840 RANGE_EXPR element. */
4843 output_constructor_array_range (oc_local_state
*local
)
4845 unsigned HOST_WIDE_INT fieldsize
4846 = int_size_in_bytes (TREE_TYPE (local
->type
));
4848 HOST_WIDE_INT lo_index
4849 = tree_to_shwi (TREE_OPERAND (local
->index
, 0));
4850 HOST_WIDE_INT hi_index
4851 = tree_to_shwi (TREE_OPERAND (local
->index
, 1));
4852 HOST_WIDE_INT index
;
4855 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4857 for (index
= lo_index
; index
<= hi_index
; index
++)
4859 /* Output the element's initial value. */
4860 if (local
->val
== NULL_TREE
)
4861 assemble_zeros (fieldsize
);
4863 output_constant (local
->val
, fieldsize
, align2
);
4865 /* Count its size. */
4866 local
->total_bytes
+= fieldsize
;
4870 /* Helper for output_constructor. From the current LOCAL state, output a
4871 field element that is not true bitfield or part of an outer one. */
4874 output_constructor_regular_field (oc_local_state
*local
)
4876 /* Field size and position. Since this structure is static, we know the
4877 positions are constant. */
4878 unsigned HOST_WIDE_INT fieldsize
;
4879 HOST_WIDE_INT fieldpos
;
4881 unsigned int align2
;
4883 if (local
->index
!= NULL_TREE
)
4885 /* Perform the index calculation in modulo arithmetic but
4886 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4887 but we are using an unsigned sizetype. */
4888 unsigned prec
= TYPE_PRECISION (sizetype
);
4889 double_int idx
= tree_to_double_int (local
->index
)
4890 - tree_to_double_int (local
->min_index
);
4891 idx
= idx
.sext (prec
);
4892 fieldpos
= (tree_to_uhwi (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
)))
4895 else if (local
->field
!= NULL_TREE
)
4896 fieldpos
= int_byte_position (local
->field
);
4900 /* Output any buffered-up bit-fields preceding this element. */
4901 if (local
->byte_buffer_in_use
)
4903 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4904 local
->total_bytes
++;
4905 local
->byte_buffer_in_use
= false;
4908 /* Advance to offset of this element.
4909 Note no alignment needed in an array, since that is guaranteed
4910 if each element has the proper size. */
4911 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4912 && fieldpos
!= local
->total_bytes
)
4914 gcc_assert (fieldpos
>= local
->total_bytes
);
4915 assemble_zeros (fieldpos
- local
->total_bytes
);
4916 local
->total_bytes
= fieldpos
;
4919 /* Find the alignment of this element. */
4920 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
4922 /* Determine size this element should occupy. */
4927 /* If this is an array with an unspecified upper bound,
4928 the initializer determines the size. */
4929 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4930 but we cannot do this until the deprecated support for
4931 initializing zero-length array members is removed. */
4932 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
4933 && TYPE_DOMAIN (TREE_TYPE (local
->field
))
4934 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
))))
4936 fieldsize
= array_size_for_constructor (local
->val
);
4937 /* Given a non-empty initialization, this field had
4939 gcc_assert (!fieldsize
|| !DECL_CHAIN (local
->field
));
4942 fieldsize
= tree_to_uhwi (DECL_SIZE_UNIT (local
->field
));
4945 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
4947 /* Output the element's initial value. */
4948 if (local
->val
== NULL_TREE
)
4949 assemble_zeros (fieldsize
);
4951 output_constant (local
->val
, fieldsize
, align2
);
4953 /* Count its size. */
4954 local
->total_bytes
+= fieldsize
;
4957 /* Helper for output_constructor. From the LOCAL state, output an element
4958 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
4959 from the start of a possibly ongoing outer byte buffer. */
4962 output_constructor_bitfield (oc_local_state
*local
, unsigned int bit_offset
)
4964 /* Bit size of this element. */
4965 HOST_WIDE_INT ebitsize
4967 ? tree_to_uhwi (DECL_SIZE (local
->field
))
4968 : tree_to_uhwi (TYPE_SIZE (TREE_TYPE (local
->type
))));
4970 /* Relative index of this element if this is an array component. */
4971 HOST_WIDE_INT relative_index
4974 ? (tree_to_shwi (local
->index
)
4975 - tree_to_shwi (local
->min_index
))
4976 : local
->last_relative_index
+ 1)
4979 /* Bit position of this element from the start of the containing
4981 HOST_WIDE_INT constructor_relative_ebitpos
4983 ? int_bit_position (local
->field
)
4984 : ebitsize
* relative_index
);
4986 /* Bit position of this element from the start of a possibly ongoing
4987 outer byte buffer. */
4988 HOST_WIDE_INT byte_relative_ebitpos
4989 = bit_offset
+ constructor_relative_ebitpos
;
4991 /* From the start of a possibly ongoing outer byte buffer, offsets to
4992 the first bit of this element and to the first bit past the end of
4994 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
4995 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
4997 local
->last_relative_index
= relative_index
;
4999 if (local
->val
== NULL_TREE
)
5000 local
->val
= integer_zero_node
;
5002 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
5003 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
5004 local
->val
= TREE_OPERAND (local
->val
, 0);
5006 if (TREE_CODE (local
->val
) != INTEGER_CST
5007 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
5009 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
5013 /* If this field does not start in this (or next) byte, skip some bytes. */
5014 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5016 /* Output remnant of any bit field in previous bytes. */
5017 if (local
->byte_buffer_in_use
)
5019 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5020 local
->total_bytes
++;
5021 local
->byte_buffer_in_use
= false;
5024 /* If still not at proper byte, advance to there. */
5025 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5027 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
5028 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
5029 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
5033 /* Set up the buffer if necessary. */
5034 if (!local
->byte_buffer_in_use
)
5038 local
->byte_buffer_in_use
= true;
5041 /* If this is nested constructor, recurse passing the bit offset and the
5042 pending data, then retrieve the new pending data afterwards. */
5043 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
5045 oc_outer_state temp_state
;
5046 temp_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
5047 temp_state
.byte
= local
->byte
;
5049 += output_constructor (local
->val
, 0, 0, &temp_state
);
5050 local
->byte
= temp_state
.byte
;
5054 /* Otherwise, we must split the element into pieces that fall within
5055 separate bytes, and combine each byte with previous or following
5057 while (next_offset
< end_offset
)
5061 HOST_WIDE_INT value
;
5062 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
5063 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
5065 /* Advance from byte to byte within this element when necessary. */
5066 while (next_byte
!= local
->total_bytes
)
5068 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5069 local
->total_bytes
++;
5073 /* Number of bits we can process at once (all part of the same byte). */
5074 this_time
= MIN (end_offset
- next_offset
, BITS_PER_UNIT
- next_bit
);
5075 if (BYTES_BIG_ENDIAN
)
5077 /* On big-endian machine, take the most significant bits
5078 first (of the bits that are significant)
5079 and put them into bytes from the most significant end. */
5080 shift
= end_offset
- next_offset
- this_time
;
5082 /* Don't try to take a bunch of bits that cross
5083 the word boundary in the INTEGER_CST. We can
5084 only select bits from the LOW or HIGH part
5086 if (shift
< HOST_BITS_PER_WIDE_INT
5087 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
5089 this_time
= shift
+ this_time
- HOST_BITS_PER_WIDE_INT
;
5090 shift
= HOST_BITS_PER_WIDE_INT
;
5093 /* Now get the bits from the appropriate constant word. */
5094 if (shift
< HOST_BITS_PER_WIDE_INT
)
5095 value
= TREE_INT_CST_LOW (local
->val
);
5098 gcc_assert (shift
< HOST_BITS_PER_DOUBLE_INT
);
5099 value
= TREE_INT_CST_HIGH (local
->val
);
5100 shift
-= HOST_BITS_PER_WIDE_INT
;
5103 /* Get the result. This works only when:
5104 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5105 local
->byte
|= (((value
>> shift
)
5106 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5107 << (BITS_PER_UNIT
- this_time
- next_bit
));
5111 /* On little-endian machines,
5112 take first the least significant bits of the value
5113 and pack them starting at the least significant
5114 bits of the bytes. */
5115 shift
= next_offset
- byte_relative_ebitpos
;
5117 /* Don't try to take a bunch of bits that cross
5118 the word boundary in the INTEGER_CST. We can
5119 only select bits from the LOW or HIGH part
5121 if (shift
< HOST_BITS_PER_WIDE_INT
5122 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
5123 this_time
= (HOST_BITS_PER_WIDE_INT
- shift
);
5125 /* Now get the bits from the appropriate constant word. */
5126 if (shift
< HOST_BITS_PER_WIDE_INT
)
5127 value
= TREE_INT_CST_LOW (local
->val
);
5130 gcc_assert (shift
< HOST_BITS_PER_DOUBLE_INT
);
5131 value
= TREE_INT_CST_HIGH (local
->val
);
5132 shift
-= HOST_BITS_PER_WIDE_INT
;
5135 /* Get the result. This works only when:
5136 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5137 local
->byte
|= (((value
>> shift
)
5138 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5142 next_offset
+= this_time
;
5143 local
->byte_buffer_in_use
= true;
5147 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5148 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5149 caller output state of relevance in recursive invocations. */
5151 static unsigned HOST_WIDE_INT
5152 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
5153 unsigned int align
, oc_outer_state
*outer
)
5155 unsigned HOST_WIDE_INT cnt
;
5156 constructor_elt
*ce
;
5158 oc_local_state local
;
5160 /* Setup our local state to communicate with helpers. */
5162 local
.type
= TREE_TYPE (exp
);
5164 local
.align
= align
;
5165 if (TREE_CODE (local
.type
) == ARRAY_TYPE
&& TYPE_DOMAIN (local
.type
))
5166 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5168 local
.min_index
= NULL_TREE
;
5170 local
.total_bytes
= 0;
5171 local
.byte_buffer_in_use
= outer
!= NULL
;
5172 local
.byte
= outer
? outer
->byte
: 0;
5173 local
.last_relative_index
= -1;
5175 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5177 /* As CE goes through the elements of the constant, FIELD goes through the
5178 structure fields if the constant is a structure. If the constant is a
5179 union, we override this by getting the field from the TREE_LIST element.
5180 But the constant could also be an array. Then FIELD is zero.
5182 There is always a maximum of one element in the chain LINK for unions
5183 (even if the initializer in a source program incorrectly contains
5186 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5187 local
.field
= TYPE_FIELDS (local
.type
);
5189 local
.field
= NULL_TREE
;
5192 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5193 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5195 local
.val
= ce
->value
;
5196 local
.index
= NULL_TREE
;
5198 /* The element in a union constructor specifies the proper field
5200 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5201 local
.field
= ce
->index
;
5203 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5204 local
.index
= ce
->index
;
5206 if (local
.field
&& flag_verbose_asm
)
5207 fprintf (asm_out_file
, "%s %s:\n",
5209 DECL_NAME (local
.field
)
5210 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5213 /* Eliminate the marker that makes a cast not be an lvalue. */
5214 if (local
.val
!= NULL_TREE
)
5215 STRIP_NOPS (local
.val
);
5217 /* Output the current element, using the appropriate helper ... */
5219 /* For an array slice not part of an outer bitfield. */
5221 && local
.index
!= NULL_TREE
5222 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5223 output_constructor_array_range (&local
);
5225 /* For a field that is neither a true bitfield nor part of an outer one,
5226 known to be at least byte aligned and multiple-of-bytes long. */
5228 && (local
.field
== NULL_TREE
5229 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5230 output_constructor_regular_field (&local
);
5232 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5233 supported for scalar fields, so we may need to convert first. */
5236 if (TREE_CODE (local
.val
) == REAL_CST
)
5238 = fold_unary (VIEW_CONVERT_EXPR
,
5239 build_nonstandard_integer_type
5240 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5242 output_constructor_bitfield (&local
, outer
? outer
->bit_offset
: 0);
5246 /* If we are not at toplevel, save the pending data for our caller.
5247 Otherwise output the pending data and padding zeros as needed. */
5249 outer
->byte
= local
.byte
;
5252 if (local
.byte_buffer_in_use
)
5254 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5255 local
.total_bytes
++;
5258 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5260 assemble_zeros (local
.size
- local
.total_bytes
);
5261 local
.total_bytes
= local
.size
;
5265 return local
.total_bytes
;
5268 /* Mark DECL as weak. */
5271 mark_weak (tree decl
)
5273 DECL_WEAK (decl
) = 1;
5275 if (DECL_RTL_SET_P (decl
)
5276 && MEM_P (DECL_RTL (decl
))
5277 && XEXP (DECL_RTL (decl
), 0)
5278 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5279 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5282 /* Merge weak status between NEWDECL and OLDDECL. */
5285 merge_weak (tree newdecl
, tree olddecl
)
5287 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5289 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5292 /* We put the NEWDECL on the weak_decls list at some point
5293 and OLDDECL as well. Keep just OLDDECL on the list. */
5294 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5295 if (TREE_VALUE (*pwd
) == newdecl
)
5297 *pwd
= TREE_CHAIN (*pwd
);
5304 if (DECL_WEAK (newdecl
))
5308 /* NEWDECL is weak, but OLDDECL is not. */
5310 /* If we already output the OLDDECL, we're in trouble; we can't
5311 go back and make it weak. This should never happen in
5312 unit-at-a-time compilation. */
5313 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5315 /* If we've already generated rtl referencing OLDDECL, we may
5316 have done so in a way that will not function properly with
5317 a weak symbol. Again in unit-at-a-time this should be
5319 gcc_assert (!TREE_USED (olddecl
)
5320 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5322 if (TARGET_SUPPORTS_WEAK
)
5324 /* We put the NEWDECL on the weak_decls list at some point.
5325 Replace it with the OLDDECL. */
5326 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5327 if (TREE_VALUE (wd
) == newdecl
)
5329 TREE_VALUE (wd
) = olddecl
;
5332 /* We may not find the entry on the list. If NEWDECL is a
5333 weak alias, then we will have already called
5334 globalize_decl to remove the entry; in that case, we do
5335 not need to do anything. */
5338 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5339 mark_weak (olddecl
);
5342 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5343 weak. Just update NEWDECL to indicate that it's weak too. */
5344 mark_weak (newdecl
);
5347 /* Declare DECL to be a weak symbol. */
5350 declare_weak (tree decl
)
5352 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5353 if (! TREE_PUBLIC (decl
))
5354 error ("weak declaration of %q+D must be public", decl
);
5355 else if (!TARGET_SUPPORTS_WEAK
)
5356 warning (0, "weak declaration of %q+D not supported", decl
);
5359 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5360 DECL_ATTRIBUTES (decl
)
5361 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5365 weak_finish_1 (tree decl
)
5367 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5368 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5371 if (! TREE_USED (decl
))
5374 #ifdef ASM_WEAKEN_DECL
5375 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5377 #ifdef ASM_WEAKEN_LABEL
5378 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5380 #ifdef ASM_OUTPUT_WEAK_ALIAS
5382 static bool warn_once
= 0;
5385 warning (0, "only weak aliases are supported in this configuration");
5395 /* Fiven an assembly name, find the decl it is associated with. */
5397 find_decl (tree target
)
5399 symtab_node
*node
= symtab_node_for_asm (target
);
5405 /* This TREE_LIST contains weakref targets. */
5407 static GTY(()) tree weakref_targets
;
5409 /* Emit any pending weak declarations. */
5416 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5418 tree alias_decl
= TREE_PURPOSE (t
);
5419 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5421 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5422 /* Remove alias_decl from the weak list, but leave entries for
5423 the target alone. */
5425 #ifndef ASM_OUTPUT_WEAKREF
5426 else if (! TREE_SYMBOL_REFERENCED (target
))
5428 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5429 defined, otherwise we and weak_finish_1 would use
5430 different macros. */
5431 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5432 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5434 tree decl
= find_decl (target
);
5438 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5439 TREE_CODE (alias_decl
), target
,
5440 TREE_TYPE (alias_decl
));
5442 DECL_EXTERNAL (decl
) = 1;
5443 TREE_PUBLIC (decl
) = 1;
5444 DECL_ARTIFICIAL (decl
) = 1;
5445 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5446 TREE_USED (decl
) = 1;
5449 weak_finish_1 (decl
);
5458 /* Remove the alias and the target from the pending weak list
5459 so that we do not emit any .weak directives for the former,
5460 nor multiple .weak directives for the latter. */
5461 for (p
= &weak_decls
; (t2
= *p
) ; )
5463 if (TREE_VALUE (t2
) == alias_decl
5464 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5465 *p
= TREE_CHAIN (t2
);
5467 p
= &TREE_CHAIN (t2
);
5470 /* Remove other weakrefs to the same target, to speed things up. */
5471 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5473 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5474 *p
= TREE_CHAIN (t2
);
5476 p
= &TREE_CHAIN (t2
);
5481 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5483 tree decl
= TREE_VALUE (t
);
5485 weak_finish_1 (decl
);
5489 /* Emit the assembly bits to indicate that DECL is globally visible. */
5492 globalize_decl (tree decl
)
5495 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5496 if (DECL_WEAK (decl
))
5498 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5501 #ifdef ASM_WEAKEN_DECL
5502 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5504 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5507 /* Remove this function from the pending weak list so that
5508 we do not emit multiple .weak directives for it. */
5509 for (p
= &weak_decls
; (t
= *p
) ; )
5511 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5512 *p
= TREE_CHAIN (t
);
5514 p
= &TREE_CHAIN (t
);
5517 /* Remove weakrefs to the same target from the pending weakref
5518 list, for the same reason. */
5519 for (p
= &weakref_targets
; (t
= *p
) ; )
5521 if (DECL_ASSEMBLER_NAME (decl
)
5522 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5523 *p
= TREE_CHAIN (t
);
5525 p
= &TREE_CHAIN (t
);
5532 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5535 vec
<alias_pair
, va_gc
> *alias_pairs
;
5537 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5538 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5539 tree node is DECL to have the value of the tree node TARGET. */
5542 do_assemble_alias (tree decl
, tree target
)
5544 /* Emulated TLS had better not get this var. */
5545 gcc_assert (!(!targetm
.have_tls
5546 && TREE_CODE (decl
) == VAR_DECL
5547 && DECL_THREAD_LOCAL_P (decl
)));
5549 if (TREE_ASM_WRITTEN (decl
))
5552 /* We must force creation of DECL_RTL for debug info generation, even though
5553 we don't use it here. */
5554 make_decl_rtl (decl
);
5556 TREE_ASM_WRITTEN (decl
) = 1;
5557 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5559 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5561 ultimate_transparent_alias_target (&target
);
5563 if (!TREE_SYMBOL_REFERENCED (target
))
5564 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5566 #ifdef ASM_OUTPUT_WEAKREF
5567 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5568 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5569 IDENTIFIER_POINTER (target
));
5571 if (!TARGET_SUPPORTS_WEAK
)
5573 error_at (DECL_SOURCE_LOCATION (decl
),
5574 "weakref is not supported in this configuration");
5581 #ifdef ASM_OUTPUT_DEF
5582 /* Make name accessible from other files, if appropriate. */
5584 if (TREE_PUBLIC (decl
))
5586 globalize_decl (decl
);
5587 maybe_assemble_visibility (decl
);
5589 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5591 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5592 if (targetm
.has_ifunc_p ())
5593 ASM_OUTPUT_TYPE_DIRECTIVE
5594 (asm_out_file
, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5598 error_at (DECL_SOURCE_LOCATION (decl
),
5599 "ifunc is not supported on this target");
5602 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5603 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5605 ASM_OUTPUT_DEF (asm_out_file
,
5606 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5607 IDENTIFIER_POINTER (target
));
5609 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5614 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5615 # ifdef ASM_WEAKEN_DECL
5616 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5618 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5620 /* Remove this function from the pending weak list so that
5621 we do not emit multiple .weak directives for it. */
5622 for (p
= &weak_decls
; (t
= *p
) ; )
5623 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5624 *p
= TREE_CHAIN (t
);
5626 p
= &TREE_CHAIN (t
);
5628 /* Remove weakrefs to the same target from the pending weakref
5629 list, for the same reason. */
5630 for (p
= &weakref_targets
; (t
= *p
) ; )
5632 if (DECL_ASSEMBLER_NAME (decl
)
5633 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5634 *p
= TREE_CHAIN (t
);
5636 p
= &TREE_CHAIN (t
);
5642 /* Emit an assembler directive to make the symbol for DECL an alias to
5643 the symbol for TARGET. */
5646 assemble_alias (tree decl
, tree target
)
5650 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5652 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5654 ultimate_transparent_alias_target (&target
);
5656 if (alias
== target
)
5657 error ("weakref %q+D ultimately targets itself", decl
);
5658 if (TREE_PUBLIC (decl
))
5659 error ("weakref %q+D must have static linkage", decl
);
5663 #if !defined (ASM_OUTPUT_DEF)
5664 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5665 error_at (DECL_SOURCE_LOCATION (decl
),
5666 "alias definitions not supported in this configuration");
5669 if (!DECL_WEAK (decl
))
5671 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5672 error_at (DECL_SOURCE_LOCATION (decl
),
5673 "ifunc is not supported in this configuration");
5675 error_at (DECL_SOURCE_LOCATION (decl
),
5676 "only weak aliases are supported in this configuration");
5682 TREE_USED (decl
) = 1;
5684 /* Allow aliases to aliases. */
5685 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5686 cgraph_get_create_node (decl
)->alias
= true;
5688 varpool_node_for_decl (decl
)->alias
= true;
5690 /* If the target has already been emitted, we don't have to queue the
5691 alias. This saves a tad of memory. */
5692 if (cgraph_global_info_ready
)
5693 target_decl
= find_decl (target
);
5696 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5697 || cgraph_state
>= CGRAPH_STATE_EXPANSION
)
5698 do_assemble_alias (decl
, target
);
5701 alias_pair p
= {decl
, target
};
5702 vec_safe_push (alias_pairs
, p
);
5706 /* Record and output a table of translations from original function
5707 to its transaction aware clone. Note that tm_pure functions are
5708 considered to be their own clone. */
5710 static GTY((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
5711 htab_t tm_clone_hash
;
5714 record_tm_clone_pair (tree o
, tree n
)
5716 struct tree_map
**slot
, *h
;
5718 if (tm_clone_hash
== NULL
)
5719 tm_clone_hash
= htab_create_ggc (32, tree_map_hash
, tree_map_eq
, 0);
5721 h
= ggc_alloc_tree_map ();
5722 h
->hash
= htab_hash_pointer (o
);
5726 slot
= (struct tree_map
**)
5727 htab_find_slot_with_hash (tm_clone_hash
, h
, h
->hash
, INSERT
);
5732 get_tm_clone_pair (tree o
)
5736 struct tree_map
*h
, in
;
5739 in
.hash
= htab_hash_pointer (o
);
5740 h
= (struct tree_map
*) htab_find_with_hash (tm_clone_hash
,
5748 typedef struct tm_alias_pair
5756 /* Helper function for finish_tm_clone_pairs. Dump a hash table entry
5757 into a VEC in INFO. */
5760 dump_tm_clone_to_vec (void **slot
, void *info
)
5762 struct tree_map
*map
= (struct tree_map
*) *slot
;
5763 vec
<tm_alias_pair
> *tm_alias_pairs
= (vec
<tm_alias_pair
> *) info
;
5764 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5765 tm_alias_pairs
->safe_push (p
);
5769 /* Dump the actual pairs to the .tm_clone_table section. */
5772 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5776 bool switched
= false;
5778 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5782 struct cgraph_node
*src_n
= cgraph_get_node (src
);
5783 struct cgraph_node
*dst_n
= cgraph_get_node (dst
);
5785 /* The function ipa_tm_create_version() marks the clone as needed if
5786 the original function was needed. But we also mark the clone as
5787 needed if we ever called the clone indirectly through
5788 TM_GETTMCLONE. If neither of these are true, we didn't generate
5789 a clone, and we didn't call it indirectly... no sense keeping it
5790 in the clone table. */
5791 if (!dst_n
|| !dst_n
->definition
)
5794 /* This covers the case where we have optimized the original
5795 function away, and only access the transactional clone. */
5796 if (!src_n
|| !src_n
->definition
)
5801 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5802 assemble_align (POINTER_SIZE
);
5806 assemble_integer (XEXP (DECL_RTL (src
), 0),
5807 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5808 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5809 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5813 /* Provide a default for the tm_clone_table section. */
5816 default_clone_table_section (void)
5818 return get_named_section (NULL
, ".tm_clone_table", 3);
5821 /* Helper comparison function for qsorting by the DECL_UID stored in
5822 alias_pair->emitted_diags. */
5825 tm_alias_pair_cmp (const void *x
, const void *y
)
5827 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5828 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5829 if (p1
->uid
< p2
->uid
)
5831 if (p1
->uid
> p2
->uid
)
5837 finish_tm_clone_pairs (void)
5839 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5841 if (tm_clone_hash
== NULL
)
5844 /* We need a determenistic order for the .tm_clone_table, otherwise
5845 we will get bootstrap comparison failures, so dump the hash table
5846 to a vector, sort it, and dump the vector. */
5848 /* Dump the hashtable to a vector. */
5849 htab_traverse_noresize (tm_clone_hash
, dump_tm_clone_to_vec
,
5850 (void *) &tm_alias_pairs
);
5852 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5855 dump_tm_clone_pairs (tm_alias_pairs
);
5857 htab_delete (tm_clone_hash
);
5858 tm_clone_hash
= NULL
;
5859 tm_alias_pairs
.release ();
5863 /* Emit an assembler directive to set symbol for DECL visibility to
5864 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5867 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5868 int vis ATTRIBUTE_UNUSED
)
5870 #ifdef HAVE_GAS_HIDDEN
5871 static const char * const visibility_types
[] = {
5872 NULL
, "protected", "hidden", "internal"
5875 const char *name
, *type
;
5877 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5878 type
= visibility_types
[vis
];
5880 fprintf (asm_out_file
, "\t.%s\t", type
);
5881 assemble_name (asm_out_file
, name
);
5882 fprintf (asm_out_file
, "\n");
5884 if (!DECL_ARTIFICIAL (decl
))
5885 warning (OPT_Wattributes
, "visibility attribute not supported "
5886 "in this configuration; ignored");
5890 /* A helper function to call assemble_visibility when needed for a decl. */
5893 maybe_assemble_visibility (tree decl
)
5895 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5897 if (vis
!= VISIBILITY_DEFAULT
)
5899 targetm
.asm_out
.assemble_visibility (decl
, vis
);
5906 /* Returns 1 if the target configuration supports defining public symbols
5907 so that one of them will be chosen at link time instead of generating a
5908 multiply-defined symbol error, whether through the use of weak symbols or
5909 a target-specific mechanism for having duplicates discarded. */
5912 supports_one_only (void)
5914 if (SUPPORTS_ONE_ONLY
)
5916 return TARGET_SUPPORTS_WEAK
;
5919 /* Set up DECL as a public symbol that can be defined in multiple
5920 translation units without generating a linker error. */
5923 make_decl_one_only (tree decl
, tree comdat_group
)
5925 gcc_assert (TREE_CODE (decl
) == VAR_DECL
5926 || TREE_CODE (decl
) == FUNCTION_DECL
);
5928 TREE_PUBLIC (decl
) = 1;
5930 if (SUPPORTS_ONE_ONLY
)
5932 #ifdef MAKE_DECL_ONE_ONLY
5933 MAKE_DECL_ONE_ONLY (decl
);
5935 DECL_COMDAT_GROUP (decl
) = comdat_group
;
5937 else if (TREE_CODE (decl
) == VAR_DECL
5938 && (DECL_INITIAL (decl
) == 0 || DECL_INITIAL (decl
) == error_mark_node
))
5939 DECL_COMMON (decl
) = 1;
5942 gcc_assert (TARGET_SUPPORTS_WEAK
);
5943 DECL_WEAK (decl
) = 1;
5948 init_varasm_once (void)
5950 section_htab
= htab_create_ggc (31, section_entry_hash
,
5951 section_entry_eq
, NULL
);
5952 object_block_htab
= htab_create_ggc (31, object_block_entry_hash
,
5953 object_block_entry_eq
, NULL
);
5954 const_desc_htab
= htab_create_ggc (1009, const_desc_hash
,
5955 const_desc_eq
, NULL
);
5957 const_alias_set
= new_alias_set ();
5958 shared_constant_pool
= create_constant_pool ();
5960 #ifdef TEXT_SECTION_ASM_OP
5961 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
5962 TEXT_SECTION_ASM_OP
);
5965 #ifdef DATA_SECTION_ASM_OP
5966 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5967 DATA_SECTION_ASM_OP
);
5970 #ifdef SDATA_SECTION_ASM_OP
5971 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5972 SDATA_SECTION_ASM_OP
);
5975 #ifdef READONLY_DATA_SECTION_ASM_OP
5976 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
5977 READONLY_DATA_SECTION_ASM_OP
);
5980 #ifdef CTORS_SECTION_ASM_OP
5981 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
5982 CTORS_SECTION_ASM_OP
);
5985 #ifdef DTORS_SECTION_ASM_OP
5986 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
5987 DTORS_SECTION_ASM_OP
);
5990 #ifdef BSS_SECTION_ASM_OP
5991 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5992 output_section_asm_op
,
5993 BSS_SECTION_ASM_OP
);
5996 #ifdef SBSS_SECTION_ASM_OP
5997 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5998 output_section_asm_op
,
5999 SBSS_SECTION_ASM_OP
);
6002 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6003 | SECTION_COMMON
, emit_tls_common
);
6004 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6005 | SECTION_COMMON
, emit_local
);
6006 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6007 | SECTION_COMMON
, emit_common
);
6009 #if defined ASM_OUTPUT_ALIGNED_BSS
6010 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
6014 targetm
.asm_out
.init_sections ();
6016 if (readonly_data_section
== NULL
)
6017 readonly_data_section
= text_section
;
6019 #ifdef ASM_OUTPUT_EXTERNAL
6020 pending_assemble_externals_set
= pointer_set_create ();
6025 decl_default_tls_model (const_tree decl
)
6027 enum tls_model kind
;
6030 is_local
= targetm
.binds_local_p (decl
);
6034 kind
= TLS_MODEL_LOCAL_EXEC
;
6036 kind
= TLS_MODEL_INITIAL_EXEC
;
6039 /* Local dynamic is inefficient when we're not combining the
6040 parts of the address. */
6041 else if (optimize
&& is_local
)
6042 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
6044 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
6045 if (kind
< flag_tls_default
)
6046 kind
= flag_tls_default
;
6051 /* Select a set of attributes for section NAME based on the properties
6052 of DECL and whether or not RELOC indicates that DECL's initializer
6053 might contain runtime relocations.
6055 We make the section read-only and executable for a function decl,
6056 read-only for a const data decl, and writable for a non-const data decl. */
6059 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6063 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6064 flags
= SECTION_CODE
;
6067 enum section_category category
6068 = categorize_decl_for_section (decl
, reloc
);
6069 if (decl_readonly_section_1 (category
))
6071 else if (category
== SECCAT_DATA_REL_RO
6072 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6073 flags
= SECTION_WRITE
| SECTION_RELRO
;
6075 flags
= SECTION_WRITE
;
6079 flags
= SECTION_WRITE
;
6080 if (strcmp (name
, ".data.rel.ro") == 0
6081 || strcmp (name
, ".data.rel.ro.local") == 0)
6082 flags
|= SECTION_RELRO
;
6085 if (decl
&& DECL_P (decl
) && DECL_ONE_ONLY (decl
))
6086 flags
|= SECTION_LINKONCE
;
6088 if (strcmp (name
, ".vtable_map_vars") == 0)
6089 flags
|= SECTION_LINKONCE
;
6091 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6092 flags
|= SECTION_TLS
| SECTION_WRITE
;
6094 if (strcmp (name
, ".bss") == 0
6095 || strncmp (name
, ".bss.", 5) == 0
6096 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6097 || strcmp (name
, ".sbss") == 0
6098 || strncmp (name
, ".sbss.", 6) == 0
6099 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6100 flags
|= SECTION_BSS
;
6102 if (strcmp (name
, ".tdata") == 0
6103 || strncmp (name
, ".tdata.", 7) == 0
6104 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6105 flags
|= SECTION_TLS
;
6107 if (strcmp (name
, ".tbss") == 0
6108 || strncmp (name
, ".tbss.", 6) == 0
6109 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6110 flags
|= SECTION_TLS
| SECTION_BSS
;
6112 /* These three sections have special ELF types. They are neither
6113 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6114 want to print a section type (@progbits or @nobits). If someone
6115 is silly enough to emit code or TLS variables to one of these
6116 sections, then don't handle them specially. */
6117 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6118 && (strcmp (name
, ".init_array") == 0
6119 || strcmp (name
, ".fini_array") == 0
6120 || strcmp (name
, ".preinit_array") == 0))
6121 flags
|= SECTION_NOTYPE
;
6126 /* Return true if the target supports some form of global BSS,
6127 either through bss_noswitch_section, or by selecting a BSS
6128 section in TARGET_ASM_SELECT_SECTION. */
6131 have_global_bss_p (void)
6133 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6136 /* Output assembly to switch to section NAME with attribute FLAGS.
6137 Four variants for common object file formats. */
6140 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6141 unsigned int flags ATTRIBUTE_UNUSED
,
6142 tree decl ATTRIBUTE_UNUSED
)
6144 /* Some object formats don't support named sections at all. The
6145 front-end should already have flagged this as an error. */
6149 #ifndef TLS_SECTION_ASM_FLAG
6150 #define TLS_SECTION_ASM_FLAG 'T'
6154 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6155 tree decl ATTRIBUTE_UNUSED
)
6157 char flagchars
[10], *f
= flagchars
;
6159 /* If we have already declared this section, we can use an
6160 abbreviated form to switch back to it -- unless this section is
6161 part of a COMDAT groups, in which case GAS requires the full
6162 declaration every time. */
6163 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6164 && (flags
& SECTION_DECLARED
))
6166 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6170 if (!(flags
& SECTION_DEBUG
))
6172 if (flags
& SECTION_EXCLUDE
)
6174 if (flags
& SECTION_WRITE
)
6176 if (flags
& SECTION_CODE
)
6178 if (flags
& SECTION_SMALL
)
6180 if (flags
& SECTION_MERGE
)
6182 if (flags
& SECTION_STRINGS
)
6184 if (flags
& SECTION_TLS
)
6185 *f
++ = TLS_SECTION_ASM_FLAG
;
6186 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6190 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6192 if (!(flags
& SECTION_NOTYPE
))
6197 if (flags
& SECTION_BSS
)
6203 /* On platforms that use "@" as the assembly comment character,
6205 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6207 fprintf (asm_out_file
, format
, type
);
6209 if (flags
& SECTION_ENTSIZE
)
6210 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6211 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6213 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6214 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6216 fprintf (asm_out_file
, ",%s,comdat",
6217 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6221 putc ('\n', asm_out_file
);
6225 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6226 tree decl ATTRIBUTE_UNUSED
)
6228 char flagchars
[8], *f
= flagchars
;
6230 if (flags
& SECTION_WRITE
)
6232 if (flags
& SECTION_CODE
)
6236 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6240 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6243 default_coff_asm_named_section (name
, flags
, decl
);
6245 if (flags
& SECTION_LINKONCE
)
6247 /* Functions may have been compiled at various levels of
6248 optimization so we can't use `same_size' here.
6249 Instead, have the linker pick one. */
6250 fprintf (asm_out_file
, "\t.linkonce %s\n",
6251 (flags
& SECTION_CODE
? "discard" : "same_size"));
6255 /* The lame default section selector. */
6258 default_select_section (tree decl
, int reloc
,
6259 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6263 if (decl_readonly_section (decl
, reloc
))
6264 return readonly_data_section
;
6266 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6268 if (! ((flag_pic
&& reloc
)
6269 || !TREE_READONLY (decl
)
6270 || TREE_SIDE_EFFECTS (decl
)
6271 || !TREE_CONSTANT (decl
)))
6272 return readonly_data_section
;
6274 else if (TREE_CODE (decl
) == STRING_CST
)
6275 return readonly_data_section
;
6276 else if (! (flag_pic
&& reloc
))
6277 return readonly_data_section
;
6279 return data_section
;
6282 enum section_category
6283 categorize_decl_for_section (const_tree decl
, int reloc
)
6285 enum section_category ret
;
6287 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6289 else if (TREE_CODE (decl
) == STRING_CST
)
6291 if ((flag_sanitize
& SANITIZE_ADDRESS
)
6292 && asan_protect_global (CONST_CAST_TREE (decl
)))
6293 /* or !flag_merge_constants */
6294 return SECCAT_RODATA
;
6296 return SECCAT_RODATA_MERGE_STR
;
6298 else if (TREE_CODE (decl
) == VAR_DECL
)
6300 if (bss_initializer_p (decl
))
6302 else if (! TREE_READONLY (decl
)
6303 || TREE_SIDE_EFFECTS (decl
)
6304 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6306 /* Here the reloc_rw_mask is not testing whether the section should
6307 be read-only or not, but whether the dynamic link will have to
6308 do something. If so, we wish to segregate the data in order to
6309 minimize cache misses inside the dynamic linker. */
6310 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6311 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6315 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6316 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6317 else if (reloc
|| flag_merge_constants
< 2
6318 || ((flag_sanitize
& SANITIZE_ADDRESS
)
6319 && asan_protect_global (CONST_CAST_TREE (decl
))))
6320 /* C and C++ don't allow different variables to share the same
6321 location. -fmerge-all-constants allows even that (at the
6322 expense of not conforming). */
6323 ret
= SECCAT_RODATA
;
6324 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6325 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6327 ret
= SECCAT_RODATA_MERGE_CONST
;
6329 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6331 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6332 || TREE_SIDE_EFFECTS (decl
)
6333 || ! TREE_CONSTANT (decl
))
6336 ret
= SECCAT_RODATA
;
6339 ret
= SECCAT_RODATA
;
6341 /* There are no read-only thread-local sections. */
6342 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6344 /* Note that this would be *just* SECCAT_BSS, except that there's
6345 no concept of a read-only thread-local-data section. */
6346 if (ret
== SECCAT_BSS
6347 || (flag_zero_initialized_in_bss
6348 && initializer_zerop (DECL_INITIAL (decl
))))
6354 /* If the target uses small data sections, select it. */
6355 else if (targetm
.in_small_data_p (decl
))
6357 if (ret
== SECCAT_BSS
)
6359 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6360 ret
= SECCAT_SRODATA
;
6369 decl_readonly_section_1 (enum section_category category
)
6374 case SECCAT_RODATA_MERGE_STR
:
6375 case SECCAT_RODATA_MERGE_STR_INIT
:
6376 case SECCAT_RODATA_MERGE_CONST
:
6377 case SECCAT_SRODATA
:
6385 decl_readonly_section (const_tree decl
, int reloc
)
6387 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6390 /* Select a section based on the above categorization. */
6393 default_elf_select_section (tree decl
, int reloc
,
6394 unsigned HOST_WIDE_INT align
)
6397 switch (categorize_decl_for_section (decl
, reloc
))
6400 /* We're not supposed to be called on FUNCTION_DECLs. */
6403 return readonly_data_section
;
6404 case SECCAT_RODATA_MERGE_STR
:
6405 return mergeable_string_section (decl
, align
, 0);
6406 case SECCAT_RODATA_MERGE_STR_INIT
:
6407 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6408 case SECCAT_RODATA_MERGE_CONST
:
6409 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6410 case SECCAT_SRODATA
:
6414 return data_section
;
6415 case SECCAT_DATA_REL
:
6416 sname
= ".data.rel";
6418 case SECCAT_DATA_REL_LOCAL
:
6419 sname
= ".data.rel.local";
6421 case SECCAT_DATA_REL_RO
:
6422 sname
= ".data.rel.ro";
6424 case SECCAT_DATA_REL_RO_LOCAL
:
6425 sname
= ".data.rel.ro.local";
6448 return get_named_section (decl
, sname
, reloc
);
6451 /* Construct a unique section name based on the decl name and the
6452 categorization performed above. */
6455 default_unique_section (tree decl
, int reloc
)
6457 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6458 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6459 const char *prefix
, *name
, *linkonce
;
6462 switch (categorize_decl_for_section (decl
, reloc
))
6465 prefix
= one_only
? ".t" : ".text";
6468 case SECCAT_RODATA_MERGE_STR
:
6469 case SECCAT_RODATA_MERGE_STR_INIT
:
6470 case SECCAT_RODATA_MERGE_CONST
:
6471 prefix
= one_only
? ".r" : ".rodata";
6473 case SECCAT_SRODATA
:
6474 prefix
= one_only
? ".s2" : ".sdata2";
6477 prefix
= one_only
? ".d" : ".data";
6479 case SECCAT_DATA_REL
:
6480 prefix
= one_only
? ".d.rel" : ".data.rel";
6482 case SECCAT_DATA_REL_LOCAL
:
6483 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6485 case SECCAT_DATA_REL_RO
:
6486 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6488 case SECCAT_DATA_REL_RO_LOCAL
:
6489 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6492 prefix
= one_only
? ".s" : ".sdata";
6495 prefix
= one_only
? ".b" : ".bss";
6498 prefix
= one_only
? ".sb" : ".sbss";
6501 prefix
= one_only
? ".td" : ".tdata";
6504 prefix
= one_only
? ".tb" : ".tbss";
6510 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
6511 name
= targetm
.strip_name_encoding (name
);
6513 /* If we're using one_only, then there needs to be a .gnu.linkonce
6514 prefix to the section name. */
6515 linkonce
= one_only
? ".gnu.linkonce" : "";
6517 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6519 DECL_SECTION_NAME (decl
) = build_string (strlen (string
), string
);
6522 /* Like compute_reloc_for_constant, except for an RTX. The return value
6523 is a mask for which bit 1 indicates a global relocation, and bit 0
6524 indicates a local relocation. */
6527 compute_reloc_for_rtx_1 (rtx
*xp
, void *data
)
6529 int *preloc
= (int *) data
;
6532 switch (GET_CODE (x
))
6535 *preloc
|= SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6548 compute_reloc_for_rtx (rtx x
)
6552 switch (GET_CODE (x
))
6558 for_each_rtx (&x
, compute_reloc_for_rtx_1
, &reloc
);
6567 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
6569 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6571 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6572 return data_section
;
6574 return readonly_data_section
;
6578 default_elf_select_rtx_section (enum machine_mode mode
, rtx x
,
6579 unsigned HOST_WIDE_INT align
)
6581 int reloc
= compute_reloc_for_rtx (x
);
6583 /* ??? Handle small data here somehow. */
6585 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6588 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6590 return get_named_section (NULL
, ".data.rel.ro", 3);
6593 return mergeable_constant_section (mode
, align
, 0);
6596 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6599 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6604 /* Careful not to prod global register variables. */
6607 symbol
= XEXP (rtl
, 0);
6608 if (GET_CODE (symbol
) != SYMBOL_REF
)
6611 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6612 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6613 flags
|= SYMBOL_FLAG_FUNCTION
;
6614 if (targetm
.binds_local_p (decl
))
6615 flags
|= SYMBOL_FLAG_LOCAL
;
6616 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6617 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6618 else if (targetm
.in_small_data_p (decl
))
6619 flags
|= SYMBOL_FLAG_SMALL
;
6620 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6621 being PUBLIC, the thing *must* be defined in this translation unit.
6622 Prevent this buglet from being propagated into rtl code as well. */
6623 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6624 flags
|= SYMBOL_FLAG_EXTERNAL
;
6626 SYMBOL_REF_FLAGS (symbol
) = flags
;
6629 /* By default, we do nothing for encode_section_info, so we need not
6630 do anything but discard the '*' marker. */
6633 default_strip_name_encoding (const char *str
)
6635 return str
+ (*str
== '*');
6638 #ifdef ASM_OUTPUT_DEF
6639 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6640 anchor relative to ".", the current section position. */
6643 default_asm_output_anchor (rtx symbol
)
6647 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6648 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6649 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6653 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6656 default_use_anchors_for_symbol_p (const_rtx symbol
)
6661 /* Don't use anchors for mergeable sections. The linker might move
6662 the objects around. */
6663 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6664 if (sect
->common
.flags
& SECTION_MERGE
)
6667 /* Don't use anchors for small data sections. The small data register
6668 acts as an anchor for such sections. */
6669 if (sect
->common
.flags
& SECTION_SMALL
)
6672 decl
= SYMBOL_REF_DECL (symbol
);
6673 if (decl
&& DECL_P (decl
))
6675 /* Don't use section anchors for decls that might be defined or
6676 usurped by other modules. */
6677 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
6680 /* Don't use section anchors for decls that will be placed in a
6681 small data section. */
6682 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6683 one above. The problem is that we only use SECTION_SMALL for
6684 sections that should be marked as small in the section directive. */
6685 if (targetm
.in_small_data_p (decl
))
6691 /* Return true when RESOLUTION indicate that symbol will be bound to the
6692 definition provided by current .o file. */
6695 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6697 return (resolution
== LDPR_PREVAILING_DEF
6698 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6699 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6702 /* Return true when RESOLUTION indicate that symbol will be bound locally
6703 within current executable or DSO. */
6706 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6708 return (resolution
== LDPR_PREVAILING_DEF
6709 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6710 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6711 || resolution
== LDPR_PREEMPTED_REG
6712 || resolution
== LDPR_PREEMPTED_IR
6713 || resolution
== LDPR_RESOLVED_IR
6714 || resolution
== LDPR_RESOLVED_EXEC
);
6717 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6718 wrt cross-module name binding. */
6721 default_binds_local_p (const_tree exp
)
6723 return default_binds_local_p_1 (exp
, flag_shlib
);
6727 default_binds_local_p_1 (const_tree exp
, int shlib
)
6730 bool resolved_locally
= false;
6731 bool resolved_to_local_def
= false;
6733 /* With resolution file in hands, take look into resolutions.
6734 We can't just return true for resolved_locally symbols,
6735 because dynamic linking might overwrite symbols
6736 in shared libraries. */
6737 if (TREE_CODE (exp
) == VAR_DECL
&& TREE_PUBLIC (exp
)
6738 && (TREE_STATIC (exp
) || DECL_EXTERNAL (exp
)))
6740 varpool_node
*vnode
= varpool_get_node (exp
);
6741 if (vnode
&& resolution_local_p (vnode
->resolution
))
6742 resolved_locally
= true;
6744 && resolution_to_local_definition_p (vnode
->resolution
))
6745 resolved_to_local_def
= true;
6747 else if (TREE_CODE (exp
) == FUNCTION_DECL
&& TREE_PUBLIC (exp
))
6749 struct cgraph_node
*node
= cgraph_get_node (exp
);
6751 && resolution_local_p (node
->resolution
))
6752 resolved_locally
= true;
6754 && resolution_to_local_definition_p (node
->resolution
))
6755 resolved_to_local_def
= true;
6758 /* A non-decl is an entry in the constant pool. */
6761 /* Weakrefs may not bind locally, even though the weakref itself is always
6762 static and therefore local. Similarly, the resolver for ifunc functions
6763 might resolve to a non-local function.
6764 FIXME: We can resolve the weakref case more curefuly by looking at the
6766 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6767 || (TREE_CODE (exp
) == FUNCTION_DECL
6768 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6770 /* Static variables are always local. */
6771 else if (! TREE_PUBLIC (exp
))
6773 /* A variable is local if the user has said explicitly that it will
6775 else if ((DECL_VISIBILITY_SPECIFIED (exp
)
6776 || resolved_to_local_def
)
6777 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6779 /* Variables defined outside this object might not be local. */
6780 else if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6782 /* If defined in this object and visibility is not default, must be
6784 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6786 /* Default visibility weak data can be overridden by a strong symbol
6787 in another module and so are not local. */
6788 else if (DECL_WEAK (exp
)
6789 && !resolved_locally
)
6791 /* If PIC, then assume that any global name can be overridden by
6792 symbols resolved from other modules. */
6795 /* Uninitialized COMMON variable may be unified with symbols
6796 resolved from other modules. */
6797 else if (DECL_COMMON (exp
)
6798 && !resolved_locally
6799 && (DECL_INITIAL (exp
) == NULL
6800 || DECL_INITIAL (exp
) == error_mark_node
))
6802 /* Otherwise we're left with initialized (or non-common) global data
6803 which is of necessity defined locally. */
6810 /* Return true when references to DECL must bind to current definition in
6813 The condition is usually equivalent to whether the function binds to the
6814 current module (shared library or executable), that is to binds_local_p.
6815 We use this fact to avoid need for another target hook and implement
6816 the logic using binds_local_p and just special cases where
6817 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6818 the weak definitions (that can be overwritten at linktime by other
6819 definition from different object file) and when resolution info is available
6820 we simply use the knowledge passed to us by linker plugin. */
6822 decl_binds_to_current_def_p (tree decl
)
6824 gcc_assert (DECL_P (decl
));
6825 if (!targetm
.binds_local_p (decl
))
6827 if (!TREE_PUBLIC (decl
))
6829 /* When resolution is available, just use it. */
6830 if (TREE_CODE (decl
) == VAR_DECL
6831 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)))
6833 varpool_node
*vnode
= varpool_get_node (decl
);
6835 && vnode
->resolution
!= LDPR_UNKNOWN
)
6836 return resolution_to_local_definition_p (vnode
->resolution
);
6838 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
6840 struct cgraph_node
*node
= cgraph_get_node (decl
);
6842 && node
->resolution
!= LDPR_UNKNOWN
)
6843 return resolution_to_local_definition_p (node
->resolution
);
6845 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6846 binds locally but still can be overwritten), DECL_COMMON (can be merged
6847 with a non-common definition somewhere in the same module) or
6849 This rely on fact that binds_local_p behave as decl_replaceable_p
6850 for all other declaration types. */
6851 if (DECL_WEAK (decl
))
6853 if (DECL_COMMON (decl
)
6854 && (DECL_INITIAL (decl
) == NULL
6855 || DECL_INITIAL (decl
) == error_mark_node
))
6857 if (DECL_EXTERNAL (decl
))
6862 /* A replaceable function or variable is one which may be replaced
6863 at link-time with an entirely different definition, provided that the
6864 replacement has the same type. For example, functions declared
6865 with __attribute__((weak)) on most systems are replaceable.
6867 COMDAT functions are not replaceable, since all definitions of the
6868 function must be equivalent. It is important that COMDAT functions
6869 not be treated as replaceable so that use of C++ template
6870 instantiations is not penalized. */
6873 decl_replaceable_p (tree decl
)
6875 gcc_assert (DECL_P (decl
));
6876 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
6878 return !decl_binds_to_current_def_p (decl
);
6881 /* Default function to output code that will globalize a label. A
6882 target must define GLOBAL_ASM_OP or provide its own function to
6883 globalize a label. */
6884 #ifdef GLOBAL_ASM_OP
6886 default_globalize_label (FILE * stream
, const char *name
)
6888 fputs (GLOBAL_ASM_OP
, stream
);
6889 assemble_name (stream
, name
);
6890 putc ('\n', stream
);
6892 #endif /* GLOBAL_ASM_OP */
6894 /* Default function to output code that will globalize a declaration. */
6896 default_globalize_decl_name (FILE * stream
, tree decl
)
6898 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6899 targetm
.asm_out
.globalize_label (stream
, name
);
6902 /* Default function to output a label for unwind information. The
6903 default is to do nothing. A target that needs nonlocal labels for
6904 unwind information must provide its own function to do this. */
6906 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6907 tree decl ATTRIBUTE_UNUSED
,
6908 int for_eh ATTRIBUTE_UNUSED
,
6909 int empty ATTRIBUTE_UNUSED
)
6913 /* Default function to output a label to divide up the exception table.
6914 The default is to do nothing. A target that needs/wants to divide
6915 up the table must provide it's own function to do this. */
6917 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
6921 /* This is how to output an internal numbered label where PREFIX is
6922 the class of label and LABELNO is the number within the class. */
6925 default_generate_internal_label (char *buf
, const char *prefix
,
6926 unsigned long labelno
)
6928 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6931 /* This is how to output an internal numbered label where PREFIX is
6932 the class of label and LABELNO is the number within the class. */
6935 default_internal_label (FILE *stream
, const char *prefix
,
6936 unsigned long labelno
)
6938 char *const buf
= (char *) alloca (40 + strlen (prefix
));
6939 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6940 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
6944 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
6947 default_asm_declare_constant_name (FILE *file
, const char *name
,
6948 const_tree exp ATTRIBUTE_UNUSED
,
6949 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
6951 assemble_label (file
, name
);
6954 /* This is the default behavior at the beginning of a file. It's
6955 controlled by two other target-hook toggles. */
6957 default_file_start (void)
6959 if (targetm
.asm_file_start_app_off
6960 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
6961 fputs (ASM_APP_OFF
, asm_out_file
);
6963 if (targetm
.asm_file_start_file_directive
)
6964 output_file_directive (asm_out_file
, main_input_filename
);
6967 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6968 which emits a special section directive used to indicate whether or
6969 not this object file needs an executable stack. This is primarily
6970 a GNU extension to ELF but could be used on other targets. */
6972 int trampolines_created
;
6975 file_end_indicate_exec_stack (void)
6977 unsigned int flags
= SECTION_DEBUG
;
6978 if (trampolines_created
)
6979 flags
|= SECTION_CODE
;
6981 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
6984 /* Emit a special section directive to indicate that this object file
6985 was compiled with -fsplit-stack. This is used to let the linker
6986 detect calls between split-stack code and non-split-stack code, so
6987 that it can modify the split-stack code to allocate a sufficiently
6988 large stack. We emit another special section if there are any
6989 functions in this file which have the no_split_stack attribute, to
6990 prevent the linker from warning about being unable to convert the
6991 functions if they call non-split-stack code. */
6994 file_end_indicate_split_stack (void)
6996 if (flag_split_stack
)
6998 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
7000 if (saw_no_split_stack
)
7001 switch_to_section (get_section (".note.GNU-no-split-stack",
7002 SECTION_DEBUG
, NULL
));
7006 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
7007 a get_unnamed_section callback. */
7010 output_section_asm_op (const void *directive
)
7012 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
7015 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
7016 the current section is NEW_SECTION. */
7019 switch_to_section (section
*new_section
)
7021 if (in_section
== new_section
)
7024 if (new_section
->common
.flags
& SECTION_FORGET
)
7027 in_section
= new_section
;
7029 switch (SECTION_STYLE (new_section
))
7032 targetm
.asm_out
.named_section (new_section
->named
.name
,
7033 new_section
->named
.common
.flags
,
7034 new_section
->named
.decl
);
7037 case SECTION_UNNAMED
:
7038 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
7041 case SECTION_NOSWITCH
:
7046 new_section
->common
.flags
|= SECTION_DECLARED
;
7049 /* If block symbol SYMBOL has not yet been assigned an offset, place
7050 it at the end of its block. */
7053 place_block_symbol (rtx symbol
)
7055 unsigned HOST_WIDE_INT size
, mask
, offset
;
7056 struct constant_descriptor_rtx
*desc
;
7057 unsigned int alignment
;
7058 struct object_block
*block
;
7061 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7062 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7065 /* Work out the symbol's size and alignment. */
7066 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7068 desc
= SYMBOL_REF_CONSTANT (symbol
);
7069 alignment
= desc
->align
;
7070 size
= GET_MODE_SIZE (desc
->mode
);
7072 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7074 decl
= SYMBOL_REF_DECL (symbol
);
7075 alignment
= DECL_ALIGN (decl
);
7076 size
= get_constant_size (DECL_INITIAL (decl
));
7077 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7078 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7079 && asan_protect_global (DECL_INITIAL (decl
)))
7080 size
+= asan_red_zone_size (size
);
7084 decl
= SYMBOL_REF_DECL (symbol
);
7085 alignment
= get_variable_align (decl
);
7086 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7087 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7088 && asan_protect_global (decl
))
7090 size
+= asan_red_zone_size (size
);
7091 alignment
= MAX (alignment
,
7092 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7096 /* Calculate the object's offset from the start of the block. */
7097 block
= SYMBOL_REF_BLOCK (symbol
);
7098 mask
= alignment
/ BITS_PER_UNIT
- 1;
7099 offset
= (block
->size
+ mask
) & ~mask
;
7100 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7102 /* Record the block's new alignment and size. */
7103 block
->alignment
= MAX (block
->alignment
, alignment
);
7104 block
->size
= offset
+ size
;
7106 vec_safe_push (block
->objects
, symbol
);
7109 /* Return the anchor that should be used to address byte offset OFFSET
7110 from the first object in BLOCK. MODEL is the TLS model used
7114 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7115 enum tls_model model
)
7118 unsigned int begin
, middle
, end
;
7119 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7122 /* Work out the anchor's offset. Use an offset of 0 for the first
7123 anchor so that we don't pessimize the case where we take the address
7124 of a variable at the beginning of the block. This is particularly
7125 useful when a block has only one variable assigned to it.
7127 We try to place anchors RANGE bytes apart, so there can then be
7128 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7129 a ptr_mode offset. With some target settings, the lowest such
7130 anchor might be out of range for the lowest ptr_mode offset;
7131 likewise the highest anchor for the highest offset. Use anchors
7132 at the extreme ends of the ptr_mode range in such cases.
7134 All arithmetic uses unsigned integers in order to avoid
7136 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7137 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7138 range
= max_offset
- min_offset
+ 1;
7143 bias
= 1 << (GET_MODE_BITSIZE (ptr_mode
) - 1);
7146 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7147 delta
-= delta
% range
;
7150 offset
= (HOST_WIDE_INT
) (-delta
);
7154 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7155 delta
-= delta
% range
;
7156 if (delta
> bias
- 1)
7158 offset
= (HOST_WIDE_INT
) delta
;
7162 /* Do a binary search to see if there's already an anchor we can use.
7163 Set BEGIN to the new anchor's index if not. */
7165 end
= vec_safe_length (block
->anchors
);
7166 while (begin
!= end
)
7168 middle
= (end
+ begin
) / 2;
7169 anchor
= (*block
->anchors
)[middle
];
7170 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7172 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7174 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7176 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7182 /* Create a new anchor with a unique label. */
7183 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7184 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7185 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7186 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7188 /* Insert it at index BEGIN. */
7189 vec_safe_insert (block
->anchors
, begin
, anchor
);
7193 /* Output the objects in BLOCK. */
7196 output_object_block (struct object_block
*block
)
7198 struct constant_descriptor_rtx
*desc
;
7200 HOST_WIDE_INT offset
;
7204 if (!block
->objects
)
7207 /* Switch to the section and make sure that the first byte is
7208 suitably aligned. */
7209 switch_to_section (block
->sect
);
7210 assemble_align (block
->alignment
);
7212 /* Define the values of all anchors relative to the current section
7214 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7215 targetm
.asm_out
.output_anchor (symbol
);
7217 /* Output the objects themselves. */
7219 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7221 /* Move to the object's offset, padding with zeros if necessary. */
7222 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7223 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7224 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7226 desc
= SYMBOL_REF_CONSTANT (symbol
);
7227 output_constant_pool_1 (desc
, 1);
7228 offset
+= GET_MODE_SIZE (desc
->mode
);
7230 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7233 decl
= SYMBOL_REF_DECL (symbol
);
7234 assemble_constant_contents (DECL_INITIAL (decl
), XSTR (symbol
, 0),
7236 size
= get_constant_size (DECL_INITIAL (decl
));
7238 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7239 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7240 && asan_protect_global (DECL_INITIAL (decl
)))
7242 size
= asan_red_zone_size (size
);
7243 assemble_zeros (size
);
7250 decl
= SYMBOL_REF_DECL (symbol
);
7251 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7252 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7254 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7255 && asan_protect_global (decl
))
7257 size
= asan_red_zone_size (size
);
7258 assemble_zeros (size
);
7265 /* A htab_traverse callback used to call output_object_block for
7266 each member of object_block_htab. */
7269 output_object_block_htab (void **slot
, void *data ATTRIBUTE_UNUSED
)
7271 output_object_block ((struct object_block
*) (*slot
));
7275 /* Output the definitions of all object_blocks. */
7278 output_object_blocks (void)
7280 htab_traverse (object_block_htab
, output_object_block_htab
, NULL
);
7283 /* This function provides a possible implementation of the
7284 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7285 by -frecord-gcc-switches it creates a new mergeable, string section in the
7286 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7287 contains the switches in ASCII format.
7289 FIXME: This code does not correctly handle double quote characters
7290 that appear inside strings, (it strips them rather than preserving them).
7291 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7292 characters - instead it treats them as sub-string separators. Since
7293 we want to emit NUL strings terminators into the object file we have to use
7297 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7301 case SWITCH_TYPE_PASSED
:
7302 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7303 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7306 case SWITCH_TYPE_DESCRIPTIVE
:
7309 /* Distinguish between invocations where name is NULL. */
7310 static bool started
= false;
7316 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7320 | (SECTION_ENTSIZE
& 1),
7322 switch_to_section (sec
);
7331 /* The return value is currently ignored by the caller, but must be 0.
7332 For -fverbose-asm the return value would be the number of characters
7333 emitted into the assembler file. */
7337 /* Emit text to declare externally defined symbols. It is needed to
7338 properly support non-default visibility. */
7340 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7342 const char *name ATTRIBUTE_UNUSED
)
7344 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7345 set in order to avoid putting out names that are never really
7347 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7348 && targetm
.binds_local_p (decl
))
7349 maybe_assemble_visibility (decl
);
7352 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7355 default_asm_output_source_filename (FILE *file
, const char *name
)
7357 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7358 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7360 fprintf (file
, "\t.file\t");
7361 output_quoted_string (file
, name
);
7366 /* Output a file name in the form wanted by System V. */
7369 output_file_directive (FILE *asm_file
, const char *input_name
)
7374 if (input_name
== NULL
)
7375 input_name
= "<stdin>";
7377 input_name
= remap_debug_filename (input_name
);
7379 len
= strlen (input_name
);
7380 na
= input_name
+ len
;
7382 /* NA gets INPUT_NAME sans directory names. */
7383 while (na
> input_name
)
7385 if (IS_DIR_SEPARATOR (na
[-1]))
7390 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7393 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7396 make_debug_expr_from_rtl (const_rtx exp
)
7398 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7399 enum machine_mode mode
= GET_MODE (exp
);
7402 DECL_ARTIFICIAL (ddecl
) = 1;
7403 if (REG_P (exp
) && REG_EXPR (exp
))
7404 type
= TREE_TYPE (REG_EXPR (exp
));
7405 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7406 type
= TREE_TYPE (MEM_EXPR (exp
));
7409 if (type
&& TYPE_MODE (type
) == mode
)
7410 TREE_TYPE (ddecl
) = type
;
7412 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7413 DECL_MODE (ddecl
) = mode
;
7414 dval
= gen_rtx_DEBUG_EXPR (mode
);
7415 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7416 SET_DECL_RTL (ddecl
, dval
);
7420 #ifdef ELF_ASCII_ESCAPES
7421 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7424 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7429 fputs (STRING_ASM_OP
, f
);
7434 escape
= ELF_ASCII_ESCAPES
[c
];
7441 /* TODO: Print in hex with fast function, important for -flto. */
7442 fprintf (f
, "\\%03o", c
);
7455 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7458 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7460 const char *limit
= s
+ len
;
7461 const char *last_null
= NULL
;
7462 unsigned bytes_in_chunk
= 0;
7466 for (; s
< limit
; s
++)
7470 if (bytes_in_chunk
>= 60)
7479 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7486 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7488 if (bytes_in_chunk
> 0)
7495 default_elf_asm_output_limited_string (f
, s
);
7500 if (bytes_in_chunk
== 0)
7501 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7504 escape
= ELF_ASCII_ESCAPES
[c
];
7512 /* TODO: Print in hex with fast function, important for -flto. */
7513 fprintf (f
, "\\%03o", c
);
7514 bytes_in_chunk
+= 4;
7519 bytes_in_chunk
+= 2;
7526 if (bytes_in_chunk
> 0)
7534 static GTY(()) section
*elf_init_array_section
;
7535 static GTY(()) section
*elf_fini_array_section
;
7538 get_elf_initfini_array_priority_section (int priority
,
7542 if (priority
!= DEFAULT_INIT_PRIORITY
)
7545 sprintf (buf
, "%s.%.5u",
7546 constructor_p
? ".init_array" : ".fini_array",
7548 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7554 if (elf_init_array_section
== NULL
)
7555 elf_init_array_section
7556 = get_section (".init_array",
7557 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7558 sec
= elf_init_array_section
;
7562 if (elf_fini_array_section
== NULL
)
7563 elf_fini_array_section
7564 = get_section (".fini_array",
7565 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7566 sec
= elf_fini_array_section
;
7572 /* Use .init_array section for constructors. */
7575 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7577 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7579 assemble_addr_to_section (symbol
, sec
);
7582 /* Use .fini_array section for destructors. */
7585 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7587 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7589 assemble_addr_to_section (symbol
, sec
);
7592 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7594 This is a bit of a cheat. The real default is a no-op, but this
7595 hook is the default for all targets with a .ident directive. */
7598 default_asm_output_ident_directive (const char *ident_str
)
7600 const char *ident_asm_op
= "\t.ident\t";
7602 /* If we are still in the front end, do not write out the string
7603 to asm_out_file. Instead, add a fake top-level asm statement.
7604 This allows the front ends to use this hook without actually
7605 writing to asm_out_file, to handle #ident or Pragma Ident. */
7606 if (cgraph_state
== CGRAPH_STATE_PARSING
)
7608 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7609 add_asm_node (build_string (strlen (buf
), buf
));
7612 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7615 #include "gt-varasm.h"