1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987-2014 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
21 /* This file handles generation of all the assembler code
22 *except* the instructions of a function.
23 This includes declarations of variables and their initial values.
25 We also output the assembler code for constants stored in memory
26 and are responsible for combining constants with the same value. */
30 #include "coretypes.h"
34 #include "stor-layout.h"
35 #include "stringpool.h"
42 #include "hard-reg-set.h"
48 #include "diagnostic-core.h"
50 #include "langhooks.h"
54 #include "common/common-target.h"
55 #include "targhooks.h"
57 #include "dominance.h"
59 #include "basic-block.h"
64 #ifdef XCOFF_DEBUGGING_INFO
65 #include "xcoffout.h" /* Needed for external data
66 declarations for e.g. AIX 4.x. */
69 /* The (assembler) name of the first globally-visible object output. */
70 extern GTY(()) const char *first_global_object_name
;
71 extern GTY(()) const char *weak_global_object_name
;
73 const char *first_global_object_name
;
74 const char *weak_global_object_name
;
77 struct constant_descriptor_rtx
;
78 struct rtx_constant_pool
;
80 #define n_deferred_constants (crtl->varasm.deferred_constants)
82 /* Number for making the label on the next
83 constant that is stored in memory. */
85 static GTY(()) int const_labelno
;
87 /* Carry information from ASM_DECLARE_OBJECT_NAME
88 to ASM_FINISH_DECLARE_OBJECT. */
90 int size_directive_output
;
92 /* The last decl for which assemble_variable was called,
93 if it did ASM_DECLARE_OBJECT_NAME.
94 If the last call to assemble_variable didn't do that,
97 tree last_assemble_variable_decl
;
99 /* The following global variable indicates if the first basic block
100 in a function belongs to the cold partition or not. */
102 bool first_function_block_is_cold
;
104 /* Whether we saw any functions with no_split_stack. */
106 static bool saw_no_split_stack
;
108 static const char *strip_reg_name (const char *);
109 static int contains_pointers_p (tree
);
110 #ifdef ASM_OUTPUT_EXTERNAL
111 static bool incorporeal_function_p (tree
);
113 static void decode_addr_const (tree
, struct addr_const
*);
114 static hashval_t
const_hash_1 (const tree
);
115 static int compare_constant (const tree
, const tree
);
116 static void output_constant_def_contents (rtx
);
117 static void output_addressed_constants (tree
);
118 static unsigned HOST_WIDE_INT
output_constant (tree
, unsigned HOST_WIDE_INT
,
120 static void globalize_decl (tree
);
121 static bool decl_readonly_section_1 (enum section_category
);
122 #ifdef BSS_SECTION_ASM_OP
123 #ifdef ASM_OUTPUT_ALIGNED_BSS
124 static void asm_output_aligned_bss (FILE *, tree
, const char *,
125 unsigned HOST_WIDE_INT
, int)
128 #endif /* BSS_SECTION_ASM_OP */
129 static void mark_weak (tree
);
130 static void output_constant_pool (const char *, tree
);
132 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
133 section
*text_section
;
134 section
*data_section
;
135 section
*readonly_data_section
;
136 section
*sdata_section
;
137 section
*ctors_section
;
138 section
*dtors_section
;
139 section
*bss_section
;
140 section
*sbss_section
;
142 /* Various forms of common section. All are guaranteed to be nonnull. */
143 section
*tls_comm_section
;
144 section
*comm_section
;
145 section
*lcomm_section
;
147 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
149 section
*bss_noswitch_section
;
151 /* The section that holds the main exception table, when known. The section
152 is set either by the target's init_sections hook or by the first call to
153 switch_to_exception_section. */
154 section
*exception_section
;
156 /* The section that holds the DWARF2 frame unwind information, when known.
157 The section is set either by the target's init_sections hook or by the
158 first call to switch_to_eh_frame_section. */
159 section
*eh_frame_section
;
161 /* asm_out_file's current section. This is NULL if no section has yet
162 been selected or if we lose track of what the current section is. */
165 /* True if code for the current function is currently being directed
166 at the cold section. */
167 bool in_cold_section_p
;
169 /* A linked list of all the unnamed sections. */
170 static GTY(()) section
*unnamed_sections
;
172 /* Return a nonzero value if DECL has a section attribute. */
173 #define IN_NAMED_SECTION(DECL) \
174 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
175 && DECL_SECTION_NAME (DECL) != NULL)
177 struct section_hasher
: ggc_hasher
<section
*>
179 typedef const char *compare_type
;
181 static hashval_t
hash (section
*);
182 static bool equal (section
*, const char *);
185 /* Hash table of named sections. */
186 static GTY(()) hash_table
<section_hasher
> *section_htab
;
188 struct object_block_hasher
: ggc_hasher
<object_block
*>
190 typedef const section
*compare_type
;
192 static hashval_t
hash (object_block
*);
193 static bool equal (object_block
*, const section
*);
196 /* A table of object_blocks, indexed by section. */
197 static GTY(()) hash_table
<object_block_hasher
> *object_block_htab
;
199 /* The next number to use for internal anchor labels. */
200 static GTY(()) int anchor_labelno
;
202 /* A pool of constants that can be shared between functions. */
203 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
205 /* Helper routines for maintaining section_htab. */
208 section_hasher::equal (section
*old
, const char *new_name
)
210 return strcmp (old
->named
.name
, new_name
) == 0;
214 section_hasher::hash (section
*old
)
216 return htab_hash_string (old
->named
.name
);
219 /* Return a hash value for section SECT. */
222 hash_section (section
*sect
)
224 if (sect
->common
.flags
& SECTION_NAMED
)
225 return htab_hash_string (sect
->named
.name
);
226 return sect
->common
.flags
;
229 /* Helper routines for maintaining object_block_htab. */
232 object_block_hasher::equal (object_block
*old
, const section
*new_section
)
234 return old
->sect
== new_section
;
238 object_block_hasher::hash (object_block
*old
)
240 return hash_section (old
->sect
);
243 /* Return a new unnamed section with the given fields. */
246 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
251 sect
= ggc_alloc
<section
> ();
252 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
253 sect
->unnamed
.callback
= callback
;
254 sect
->unnamed
.data
= data
;
255 sect
->unnamed
.next
= unnamed_sections
;
257 unnamed_sections
= sect
;
261 /* Return a SECTION_NOSWITCH section with the given fields. */
264 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
268 sect
= ggc_alloc
<section
> ();
269 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
270 sect
->noswitch
.callback
= callback
;
275 /* Return the named section structure associated with NAME. Create
276 a new section with the given fields if no such structure exists. */
279 get_section (const char *name
, unsigned int flags
, tree decl
)
281 section
*sect
, **slot
;
283 slot
= section_htab
->find_slot_with_hash (name
, htab_hash_string (name
),
285 flags
|= SECTION_NAMED
;
288 sect
= ggc_alloc
<section
> ();
289 sect
->named
.common
.flags
= flags
;
290 sect
->named
.name
= ggc_strdup (name
);
291 sect
->named
.decl
= decl
;
297 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
298 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
300 /* It is fine if one of the section flags is
301 SECTION_WRITE | SECTION_RELRO and the other has none of these
302 flags (i.e. read-only) in named sections and either the
303 section hasn't been declared yet or has been declared as writable.
304 In that case just make sure the resulting flags are
305 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
307 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
308 == (SECTION_WRITE
| SECTION_RELRO
)
309 && (sect
->common
.flags
310 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
311 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
312 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
313 || (sect
->common
.flags
& SECTION_WRITE
)))
315 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
318 /* Sanity check user variables for flag changes. */
319 if (sect
->named
.decl
!= NULL
320 && DECL_P (sect
->named
.decl
)
321 && decl
!= sect
->named
.decl
)
323 if (decl
!= NULL
&& DECL_P (decl
))
324 error ("%+D causes a section type conflict with %D",
325 decl
, sect
->named
.decl
);
327 error ("section type conflict with %D", sect
->named
.decl
);
328 inform (DECL_SOURCE_LOCATION (sect
->named
.decl
),
329 "%qD was declared here", sect
->named
.decl
);
331 else if (decl
!= NULL
&& DECL_P (decl
))
332 error ("%+D causes a section type conflict", decl
);
334 error ("section type conflict");
335 /* Make sure we don't error about one section multiple times. */
336 sect
->common
.flags
|= SECTION_OVERRIDE
;
342 /* Return true if the current compilation mode benefits from having
343 objects grouped into blocks. */
346 use_object_blocks_p (void)
348 return flag_section_anchors
;
351 /* Return the object_block structure for section SECT. Create a new
352 structure if we haven't created one already. Return null if SECT
355 static struct object_block
*
356 get_block_for_section (section
*sect
)
358 struct object_block
*block
;
364 = object_block_htab
->find_slot_with_hash (sect
, hash_section (sect
),
369 block
= ggc_cleared_alloc
<object_block
> ();
376 /* Create a symbol with label LABEL and place it at byte offset
377 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
378 is not yet known. LABEL must be a garbage-collected string. */
381 create_block_symbol (const char *label
, struct object_block
*block
,
382 HOST_WIDE_INT offset
)
387 /* Create the extended SYMBOL_REF. */
388 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
389 symbol
= (rtx
) ggc_internal_alloc (size
);
391 /* Initialize the normal SYMBOL_REF fields. */
392 memset (symbol
, 0, size
);
393 PUT_CODE (symbol
, SYMBOL_REF
);
394 PUT_MODE (symbol
, Pmode
);
395 XSTR (symbol
, 0) = label
;
396 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
398 /* Initialize the block_symbol stuff. */
399 SYMBOL_REF_BLOCK (symbol
) = block
;
400 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
405 /* Return a section with a particular name and with whatever SECTION_*
406 flags section_type_flags deems appropriate. The name of the section
407 is taken from NAME if nonnull, otherwise it is taken from DECL's
408 DECL_SECTION_NAME. DECL is the decl associated with the section
409 (see the section comment for details) and RELOC is as for
410 section_type_flags. */
413 get_named_section (tree decl
, const char *name
, int reloc
)
419 gcc_assert (decl
&& DECL_P (decl
) && DECL_SECTION_NAME (decl
));
420 name
= DECL_SECTION_NAME (decl
);
423 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
424 return get_section (name
, flags
, decl
);
427 /* Worker for resolve_unique_section. */
430 set_implicit_section (struct symtab_node
*n
, void *data ATTRIBUTE_UNUSED
)
432 n
->implicit_section
= true;
436 /* If required, set DECL_SECTION_NAME to a unique name. */
439 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
440 int flag_function_or_data_sections
)
442 if (DECL_SECTION_NAME (decl
) == NULL
443 && targetm_common
.have_named_sections
444 && (flag_function_or_data_sections
445 || DECL_COMDAT_GROUP (decl
)))
447 targetm
.asm_out
.unique_section (decl
, reloc
);
448 if (DECL_SECTION_NAME (decl
))
449 symtab_node::get (decl
)->call_for_symbol_and_aliases
450 (set_implicit_section
, NULL
, true);
454 #ifdef BSS_SECTION_ASM_OP
456 #ifdef ASM_OUTPUT_ALIGNED_BSS
458 /* Utility function for targets to use in implementing
459 ASM_OUTPUT_ALIGNED_BSS.
460 ??? It is believed that this function will work in most cases so such
461 support is localized here. */
464 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
465 const char *name
, unsigned HOST_WIDE_INT size
,
468 switch_to_section (bss_section
);
469 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
470 #ifdef ASM_DECLARE_OBJECT_NAME
471 last_assemble_variable_decl
= decl
;
472 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
474 /* Standard thing is just output label for the object. */
475 ASM_OUTPUT_LABEL (file
, name
);
476 #endif /* ASM_DECLARE_OBJECT_NAME */
477 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
482 #endif /* BSS_SECTION_ASM_OP */
484 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
485 /* Return the hot section for function DECL. Return text_section for
489 hot_function_section (tree decl
)
491 if (decl
!= NULL_TREE
492 && DECL_SECTION_NAME (decl
) != NULL
493 && targetm_common
.have_named_sections
)
494 return get_named_section (decl
, NULL
, 0);
500 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
503 When DECL_SECTION_NAME is non-NULL and it is implicit section and
504 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
505 concatenate the name with NAMED_SECTION_SUFFIX.
506 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
509 get_named_text_section (tree decl
,
510 const char *text_section_name
,
511 const char *named_section_suffix
)
513 if (decl
&& DECL_SECTION_NAME (decl
))
515 if (named_section_suffix
)
517 const char *dsn
= DECL_SECTION_NAME (decl
);
518 const char *stripped_name
;
521 name
= (char *) alloca (strlen (dsn
) + 1);
525 stripped_name
= targetm
.strip_name_encoding (name
);
527 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
528 return get_named_section (decl
, buffer
, 0);
530 else if (symtab_node::get (decl
)->implicit_section
)
534 /* Do not try to split gnu_linkonce functions. This gets somewhat
536 if (DECL_COMDAT_GROUP (decl
) && !HAVE_COMDAT_GROUP
)
538 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
539 name
= targetm
.strip_name_encoding (name
);
540 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
546 return get_named_section (decl
, text_section_name
, 0);
549 /* Choose named function section based on its frequency. */
552 default_function_section (tree decl
, enum node_frequency freq
,
553 bool startup
, bool exit
)
555 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
556 /* Old GNU linkers have buggy --gc-section support, which sometimes
557 results in .gcc_except_table* sections being garbage collected. */
559 && symtab_node::get (decl
)->implicit_section
)
563 if (!flag_reorder_functions
564 || !targetm_common
.have_named_sections
)
566 /* Startup code should go to startup subsection unless it is
567 unlikely executed (this happens especially with function splitting
568 where we can split away unnecessary parts of static constructors. */
569 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
571 /* If we do have a profile or(and) LTO phase is executed, we do not need
572 these ELF section. */
573 if (!in_lto_p
|| !flag_profile_values
)
574 return get_named_text_section (decl
, ".text.startup", NULL
);
579 /* Similarly for exit. */
580 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
581 return get_named_text_section (decl
, ".text.exit", NULL
);
583 /* Group cold functions together, similarly for hot code. */
586 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
587 return get_named_text_section (decl
, ".text.unlikely", NULL
);
588 case NODE_FREQUENCY_HOT
:
589 /* If we do have a profile or(and) LTO phase is executed, we do not need
590 these ELF section. */
591 if (!in_lto_p
|| !flag_profile_values
)
592 return get_named_text_section (decl
, ".text.hot", NULL
);
598 /* Return the section for function DECL.
600 If DECL is NULL_TREE, return the text section. We can be passed
601 NULL_TREE under some circumstances by dbxout.c at least.
603 If FORCE_COLD is true, return cold function section ignoring
604 the frequency info of cgraph_node. */
607 function_section_1 (tree decl
, bool force_cold
)
609 section
*section
= NULL
;
610 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
611 bool startup
= false, exit
= false;
615 struct cgraph_node
*node
= cgraph_node::get (decl
);
619 freq
= node
->frequency
;
620 startup
= node
->only_called_at_startup
;
621 exit
= node
->only_called_at_exit
;
625 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
627 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
628 if (decl
!= NULL_TREE
629 && DECL_SECTION_NAME (decl
) != NULL
)
631 if (targetm
.asm_out
.function_section
)
632 section
= targetm
.asm_out
.function_section (decl
, freq
,
636 return get_named_section (decl
, NULL
, 0);
639 return targetm
.asm_out
.select_section
640 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
643 if (targetm
.asm_out
.function_section
)
644 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
647 return hot_function_section (decl
);
651 /* Return the section for function DECL.
653 If DECL is NULL_TREE, return the text section. We can be passed
654 NULL_TREE under some circumstances by dbxout.c at least. */
657 function_section (tree decl
)
659 /* Handle cases where function splitting code decides
660 to put function entry point into unlikely executed section
661 despite the fact that the function itself is not cold
662 (i.e. it is called rarely but contains a hot loop that is
663 better to live in hot subsection for the code locality). */
664 return function_section_1 (decl
,
665 first_function_block_is_cold
);
668 /* Return the section for the current function, take IN_COLD_SECTION_P
672 current_function_section (void)
674 return function_section_1 (current_function_decl
, in_cold_section_p
);
677 /* Tell assembler to switch to unlikely-to-be-executed text section. */
680 unlikely_text_section (void)
682 return function_section_1 (current_function_decl
, true);
685 /* When called within a function context, return true if the function
686 has been assigned a cold text section and if SECT is that section.
687 When called outside a function context, return true if SECT is the
688 default cold section. */
691 unlikely_text_section_p (section
*sect
)
693 return sect
== function_section_1 (current_function_decl
, true);
696 /* Return the read-only data section associated with function DECL. */
699 default_function_rodata_section (tree decl
)
701 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
703 const char *name
= DECL_SECTION_NAME (decl
);
705 if (DECL_COMDAT_GROUP (decl
) && HAVE_COMDAT_GROUP
)
711 dot
= strchr (name
+ 1, '.');
714 len
= strlen (dot
) + 8;
715 rname
= (char *) alloca (len
);
717 strcpy (rname
, ".rodata");
719 return get_section (rname
, SECTION_LINKONCE
, decl
);
721 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
722 else if (DECL_COMDAT_GROUP (decl
)
723 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
725 size_t len
= strlen (name
) + 1;
726 char *rname
= (char *) alloca (len
);
728 memcpy (rname
, name
, len
);
730 return get_section (rname
, SECTION_LINKONCE
, decl
);
732 /* For .text.foo we want to use .rodata.foo. */
733 else if (flag_function_sections
&& flag_data_sections
734 && strncmp (name
, ".text.", 6) == 0)
736 size_t len
= strlen (name
) + 1;
737 char *rname
= (char *) alloca (len
+ 2);
739 memcpy (rname
, ".rodata", 7);
740 memcpy (rname
+ 7, name
+ 5, len
- 5);
741 return get_section (rname
, 0, decl
);
745 return readonly_data_section
;
748 /* Return the read-only data section associated with function DECL
749 for targets where that section should be always the single
750 readonly data section. */
753 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
755 return readonly_data_section
;
758 /* Return the section to use for string merging. */
761 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
762 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
763 unsigned int flags ATTRIBUTE_UNUSED
)
767 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
768 && TREE_CODE (decl
) == STRING_CST
769 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
771 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
772 && TREE_STRING_LENGTH (decl
) >= len
)
774 enum machine_mode mode
;
775 unsigned int modesize
;
779 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
780 char *name
= (char *) alloca (strlen (prefix
) + 30);
782 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
783 modesize
= GET_MODE_BITSIZE (mode
);
784 if (modesize
>= 8 && modesize
<= 256
785 && (modesize
& (modesize
- 1)) == 0)
787 if (align
< modesize
)
790 str
= TREE_STRING_POINTER (decl
);
791 unit
= GET_MODE_SIZE (mode
);
793 /* Check for embedded NUL characters. */
794 for (i
= 0; i
< len
; i
+= unit
)
796 for (j
= 0; j
< unit
; j
++)
797 if (str
[i
+ j
] != '\0')
804 sprintf (name
, "%s.str%d.%d", prefix
,
805 modesize
/ 8, (int) (align
/ 8));
806 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
807 return get_section (name
, flags
, NULL
);
812 return readonly_data_section
;
815 /* Return the section to use for constant merging. */
818 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
819 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
820 unsigned int flags ATTRIBUTE_UNUSED
)
822 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
824 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
830 && (align
& (align
- 1)) == 0)
832 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
833 char *name
= (char *) alloca (strlen (prefix
) + 30);
835 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
836 flags
|= (align
/ 8) | SECTION_MERGE
;
837 return get_section (name
, flags
, NULL
);
839 return readonly_data_section
;
842 /* Given NAME, a putative register name, discard any customary prefixes. */
845 strip_reg_name (const char *name
)
847 #ifdef REGISTER_PREFIX
848 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
849 name
+= strlen (REGISTER_PREFIX
);
851 if (name
[0] == '%' || name
[0] == '#')
856 /* The user has asked for a DECL to have a particular name. Set (or
857 change) it in such a way that we don't prefix an underscore to
860 set_user_assembler_name (tree decl
, const char *name
)
862 char *starred
= (char *) alloca (strlen (name
) + 2);
864 strcpy (starred
+ 1, name
);
865 symtab
->change_decl_assembler_name (decl
, get_identifier (starred
));
866 SET_DECL_RTL (decl
, NULL_RTX
);
869 /* Decode an `asm' spec for a declaration as a register name.
870 Return the register number, or -1 if nothing specified,
871 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
872 or -3 if ASMSPEC is `cc' and is not recognized,
873 or -4 if ASMSPEC is `memory' and is not recognized.
874 Accept an exact spelling or a decimal number.
875 Prefixes such as % are optional. */
878 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
880 /* Presume just one register is clobbered. */
887 /* Get rid of confusing prefixes. */
888 asmspec
= strip_reg_name (asmspec
);
890 /* Allow a decimal number as a "register name". */
891 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
892 if (! ISDIGIT (asmspec
[i
]))
894 if (asmspec
[0] != 0 && i
< 0)
897 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0 && reg_names
[i
][0])
903 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
905 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
908 #ifdef OVERLAPPING_REGISTER_NAMES
912 const char *const name
;
915 } table
[] = OVERLAPPING_REGISTER_NAMES
;
917 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
919 && ! strcmp (asmspec
, table
[i
].name
))
921 *pnregs
= table
[i
].nregs
;
922 return table
[i
].number
;
925 #endif /* OVERLAPPING_REGISTER_NAMES */
927 #ifdef ADDITIONAL_REGISTER_NAMES
929 static const struct { const char *const name
; const int number
; } table
[]
930 = ADDITIONAL_REGISTER_NAMES
;
932 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
934 && ! strcmp (asmspec
, table
[i
].name
)
935 && reg_names
[table
[i
].number
][0])
936 return table
[i
].number
;
938 #endif /* ADDITIONAL_REGISTER_NAMES */
940 if (!strcmp (asmspec
, "memory"))
943 if (!strcmp (asmspec
, "cc"))
953 decode_reg_name (const char *name
)
956 return decode_reg_name_and_count (name
, &count
);
960 /* Return true if DECL's initializer is suitable for a BSS section. */
963 bss_initializer_p (const_tree decl
)
965 return (DECL_INITIAL (decl
) == NULL
966 /* In LTO we have no errors in program; error_mark_node is used
967 to mark offlined constructors. */
968 || (DECL_INITIAL (decl
) == error_mark_node
970 || (flag_zero_initialized_in_bss
971 /* Leave constant zeroes in .rodata so they
973 && !TREE_READONLY (decl
)
974 && initializer_zerop (DECL_INITIAL (decl
))));
977 /* Compute the alignment of variable specified by DECL.
978 DONT_OUTPUT_DATA is from assemble_variable. */
981 align_variable (tree decl
, bool dont_output_data
)
983 unsigned int align
= DECL_ALIGN (decl
);
985 /* In the case for initialing an array whose length isn't specified,
986 where we have not yet been able to do the layout,
987 figure out the proper alignment now. */
988 if (dont_output_data
&& DECL_SIZE (decl
) == 0
989 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
990 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
992 /* Some object file formats have a maximum alignment which they support.
993 In particular, a.out format supports a maximum alignment of 4. */
994 if (align
> MAX_OFILE_ALIGNMENT
)
996 error ("alignment of %q+D is greater than maximum object "
997 "file alignment %d", decl
,
998 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
999 align
= MAX_OFILE_ALIGNMENT
;
1002 if (! DECL_USER_ALIGN (decl
))
1004 #ifdef DATA_ABI_ALIGNMENT
1005 unsigned int data_abi_align
1006 = DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1007 /* For backwards compatibility, don't assume the ABI alignment for
1009 if (! DECL_THREAD_LOCAL_P (decl
) || data_abi_align
<= BITS_PER_WORD
)
1010 align
= data_abi_align
;
1013 /* On some machines, it is good to increase alignment sometimes.
1014 But as DECL_ALIGN is used both for actually emitting the variable
1015 and for code accessing the variable as guaranteed alignment, we
1016 can only increase the alignment if it is a performance optimization
1017 if the references to it must bind to the current definition. */
1018 if (decl_binds_to_current_def_p (decl
)
1019 && !DECL_VIRTUAL_P (decl
))
1021 #ifdef DATA_ALIGNMENT
1022 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1023 /* Don't increase alignment too much for TLS variables - TLS space
1025 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1028 #ifdef CONSTANT_ALIGNMENT
1029 if (DECL_INITIAL (decl
) != 0
1030 /* In LTO we have no errors in program; error_mark_node is used
1031 to mark offlined constructors. */
1032 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1034 unsigned int const_align
1035 = CONSTANT_ALIGNMENT (DECL_INITIAL (decl
), align
);
1036 /* Don't increase alignment too much for TLS variables - TLS
1037 space is too precious. */
1038 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1039 align
= const_align
;
1045 /* Reset the alignment in case we have made it tighter, so we can benefit
1046 from it in get_pointer_alignment. */
1047 DECL_ALIGN (decl
) = align
;
1050 /* Return DECL_ALIGN (decl), possibly increased for optimization purposes
1051 beyond what align_variable returned. */
1054 get_variable_align (tree decl
)
1056 unsigned int align
= DECL_ALIGN (decl
);
1058 /* For user aligned vars or static vars align_variable already did
1060 if (DECL_USER_ALIGN (decl
) || !TREE_PUBLIC (decl
))
1063 #ifdef DATA_ABI_ALIGNMENT
1064 if (DECL_THREAD_LOCAL_P (decl
))
1065 align
= DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1068 /* For decls that bind to the current definition, align_variable
1069 did also everything, except for not assuming ABI required alignment
1070 of TLS variables. For other vars, increase the alignment here
1071 as an optimization. */
1072 if (!decl_binds_to_current_def_p (decl
))
1074 /* On some machines, it is good to increase alignment sometimes. */
1075 #ifdef DATA_ALIGNMENT
1076 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1077 /* Don't increase alignment too much for TLS variables - TLS space
1079 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1082 #ifdef CONSTANT_ALIGNMENT
1083 if (DECL_INITIAL (decl
) != 0
1084 /* In LTO we have no errors in program; error_mark_node is used
1085 to mark offlined constructors. */
1086 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1088 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
1090 /* Don't increase alignment too much for TLS variables - TLS space
1092 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1093 align
= const_align
;
1101 /* Return the section into which the given VAR_DECL or CONST_DECL
1102 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1103 section should be used wherever possible. */
1106 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1108 addr_space_t as
= ADDR_SPACE_GENERIC
;
1110 varpool_node
*vnode
= varpool_node::get (decl
);
1113 vnode
= vnode
->ultimate_alias_target ();
1117 if (TREE_TYPE (decl
) != error_mark_node
)
1118 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1120 /* We need the constructor to figure out reloc flag. */
1122 vnode
->get_constructor ();
1124 if (DECL_COMMON (decl
))
1126 /* If the decl has been given an explicit section name, or it resides
1127 in a non-generic address space, then it isn't common, and shouldn't
1128 be handled as such. */
1129 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1130 && ADDR_SPACE_GENERIC_P (as
));
1131 if (DECL_THREAD_LOCAL_P (decl
))
1132 return tls_comm_section
;
1133 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1134 return comm_section
;
1137 if (DECL_INITIAL (decl
) == error_mark_node
)
1138 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1139 else if (DECL_INITIAL (decl
))
1140 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1144 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1145 if (IN_NAMED_SECTION (decl
))
1146 return get_named_section (decl
, NULL
, reloc
);
1148 if (ADDR_SPACE_GENERIC_P (as
)
1149 && !DECL_THREAD_LOCAL_P (decl
)
1150 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1151 && bss_initializer_p (decl
))
1153 if (!TREE_PUBLIC (decl
)
1154 && !((flag_sanitize
& SANITIZE_ADDRESS
)
1155 && asan_protect_global (decl
)))
1156 return lcomm_section
;
1157 if (bss_noswitch_section
)
1158 return bss_noswitch_section
;
1161 return targetm
.asm_out
.select_section (decl
, reloc
,
1162 get_variable_align (decl
));
1165 /* Return the block into which object_block DECL should be placed. */
1167 static struct object_block
*
1168 get_block_for_decl (tree decl
)
1172 if (TREE_CODE (decl
) == VAR_DECL
)
1174 /* The object must be defined in this translation unit. */
1175 if (DECL_EXTERNAL (decl
))
1178 /* There's no point using object blocks for something that is
1179 isolated by definition. */
1180 if (DECL_COMDAT_GROUP (decl
))
1184 /* We can only calculate block offsets if the decl has a known
1186 if (DECL_SIZE_UNIT (decl
) == NULL
)
1188 if (!tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
)))
1191 /* Find out which section should contain DECL. We cannot put it into
1192 an object block if it requires a standalone definition. */
1193 if (TREE_CODE (decl
) == VAR_DECL
)
1194 align_variable (decl
, 0);
1195 sect
= get_variable_section (decl
, true);
1196 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1199 return get_block_for_section (sect
);
1202 /* Make sure block symbol SYMBOL is in block BLOCK. */
1205 change_symbol_block (rtx symbol
, struct object_block
*block
)
1207 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1209 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1210 SYMBOL_REF_BLOCK (symbol
) = block
;
1214 /* Return true if it is possible to put DECL in an object_block. */
1217 use_blocks_for_decl_p (tree decl
)
1219 struct symtab_node
*snode
;
1221 /* Only data DECLs can be placed into object blocks. */
1222 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1225 /* Detect decls created by dw2_force_const_mem. Such decls are
1226 special because DECL_INITIAL doesn't specify the decl's true value.
1227 dw2_output_indirect_constants will instead call assemble_variable
1228 with dont_output_data set to 1 and then print the contents itself. */
1229 if (DECL_INITIAL (decl
) == decl
)
1232 /* If this decl is an alias, then we don't want to emit a
1234 if (TREE_CODE (decl
) == VAR_DECL
1235 && (snode
= symtab_node::get (decl
)) != NULL
1239 return targetm
.use_blocks_for_decl_p (decl
);
1242 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1243 have static storage duration. In other words, it should not be an
1244 automatic variable, including PARM_DECLs.
1246 There is, however, one exception: this function handles variables
1247 explicitly placed in a particular register by the user.
1249 This is never called for PARM_DECL nodes. */
1252 make_decl_rtl (tree decl
)
1254 const char *name
= 0;
1258 /* Check that we are not being given an automatic variable. */
1259 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1260 && TREE_CODE (decl
) != RESULT_DECL
);
1262 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1263 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1264 || TREE_STATIC (decl
)
1265 || TREE_PUBLIC (decl
)
1266 || DECL_EXTERNAL (decl
)
1267 || DECL_REGISTER (decl
));
1269 /* And that we were not given a type or a label. */
1270 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1271 && TREE_CODE (decl
) != LABEL_DECL
);
1273 /* For a duplicate declaration, we can be called twice on the
1274 same DECL node. Don't discard the RTL already made. */
1275 if (DECL_RTL_SET_P (decl
))
1277 /* If the old RTL had the wrong mode, fix the mode. */
1278 x
= DECL_RTL (decl
);
1279 if (GET_MODE (x
) != DECL_MODE (decl
))
1280 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1282 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1285 /* ??? Another way to do this would be to maintain a hashed
1286 table of such critters. Instead of adding stuff to a DECL
1287 to give certain attributes to it, we could use an external
1288 hash map from DECL to set of attributes. */
1290 /* Let the target reassign the RTL if it wants.
1291 This is necessary, for example, when one machine specific
1292 decl attribute overrides another. */
1293 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1295 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1296 on the new decl information. */
1298 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1299 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1300 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1305 /* If this variable belongs to the global constant pool, retrieve the
1306 pre-computed RTL or recompute it in LTO mode. */
1307 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_IN_CONSTANT_POOL (decl
))
1309 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1313 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
1315 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1316 && DECL_REGISTER (decl
))
1318 error ("register name not specified for %q+D", decl
);
1320 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1322 const char *asmspec
= name
+1;
1323 enum machine_mode mode
= DECL_MODE (decl
);
1324 reg_number
= decode_reg_name (asmspec
);
1325 /* First detect errors in declaring global registers. */
1326 if (reg_number
== -1)
1327 error ("register name not specified for %q+D", decl
);
1328 else if (reg_number
< 0)
1329 error ("invalid register name for %q+D", decl
);
1330 else if (mode
== BLKmode
)
1331 error ("data type of %q+D isn%'t suitable for a register",
1333 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1334 error ("the register specified for %q+D cannot be accessed"
1335 " by the current target", decl
);
1336 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1337 error ("the register specified for %q+D is not general enough"
1338 " to be used as a register variable", decl
);
1339 else if (!HARD_REGNO_MODE_OK (reg_number
, mode
))
1340 error ("register specified for %q+D isn%'t suitable for data type",
1342 /* Now handle properly declared static register variables. */
1347 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1349 DECL_INITIAL (decl
) = 0;
1350 error ("global register variable has initial value");
1352 if (TREE_THIS_VOLATILE (decl
))
1353 warning (OPT_Wvolatile_register_var
,
1354 "optimization may eliminate reads and/or "
1355 "writes to register variables");
1357 /* If the user specified one of the eliminables registers here,
1358 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1359 confused with that register and be eliminated. This usage is
1360 somewhat suspect... */
1362 SET_DECL_RTL (decl
, gen_rtx_raw_REG (mode
, reg_number
));
1363 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1364 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1366 if (TREE_STATIC (decl
))
1368 /* Make this register global, so not usable for anything
1370 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1371 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1372 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1374 nregs
= hard_regno_nregs
[reg_number
][mode
];
1376 globalize_reg (decl
, reg_number
+ --nregs
);
1379 /* As a register variable, it has no section. */
1382 /* Avoid internal errors from invalid register
1384 SET_DECL_ASSEMBLER_NAME (decl
, NULL_TREE
);
1385 DECL_HARD_REGISTER (decl
) = 0;
1388 /* Now handle ordinary static variables and functions (in memory).
1389 Also handle vars declared register invalidly. */
1390 else if (name
[0] == '*')
1392 #ifdef REGISTER_PREFIX
1393 if (strlen (REGISTER_PREFIX
) != 0)
1395 reg_number
= decode_reg_name (name
);
1396 if (reg_number
>= 0 || reg_number
== -3)
1397 error ("register name given for non-register variable %q+D", decl
);
1402 /* Specifying a section attribute on a variable forces it into a
1403 non-.bss section, and thus it cannot be common. */
1404 /* FIXME: In general this code should not be necessary because
1405 visibility pass is doing the same work. But notice_global_symbol
1406 is called early and it needs to make DECL_RTL to get the name.
1407 we take care of recomputing the DECL_RTL after visibility is changed. */
1408 if (TREE_CODE (decl
) == VAR_DECL
1409 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
))
1410 && DECL_SECTION_NAME (decl
) != NULL
1411 && DECL_INITIAL (decl
) == NULL_TREE
1412 && DECL_COMMON (decl
))
1413 DECL_COMMON (decl
) = 0;
1415 /* Variables can't be both common and weak. */
1416 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1417 DECL_COMMON (decl
) = 0;
1419 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1420 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1423 enum machine_mode address_mode
= Pmode
;
1424 if (TREE_TYPE (decl
) != error_mark_node
)
1426 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1427 address_mode
= targetm
.addr_space
.address_mode (as
);
1429 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1431 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1432 SET_SYMBOL_REF_DECL (x
, decl
);
1434 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1435 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1436 set_mem_attributes (x
, decl
, 1);
1437 SET_DECL_RTL (decl
, x
);
1439 /* Optionally set flags or add text to the name to record information
1440 such as that it is a function name.
1441 If the name is changed, the macro ASM_OUTPUT_LABELREF
1442 will have to know how to strip this information. */
1443 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1446 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1447 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1451 make_decl_rtl_for_debug (tree decl
)
1453 unsigned int save_aliasing_flag
;
1456 if (DECL_RTL_SET_P (decl
))
1457 return DECL_RTL (decl
);
1459 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1460 call new_alias_set. If running with -fcompare-debug, sometimes
1461 we do not want to create alias sets that will throw the alias
1462 numbers off in the comparison dumps. So... clearing
1463 flag_strict_aliasing will keep new_alias_set() from creating a
1465 save_aliasing_flag
= flag_strict_aliasing
;
1466 flag_strict_aliasing
= 0;
1468 rtl
= DECL_RTL (decl
);
1469 /* Reset DECL_RTL back, as various parts of the compiler expects
1470 DECL_RTL set meaning it is actually going to be output. */
1471 SET_DECL_RTL (decl
, NULL
);
1473 flag_strict_aliasing
= save_aliasing_flag
;
1477 /* Output a string of literal assembler code
1478 for an `asm' keyword used between functions. */
1481 assemble_asm (tree string
)
1486 if (TREE_CODE (string
) == ADDR_EXPR
)
1487 string
= TREE_OPERAND (string
, 0);
1489 p
= TREE_STRING_POINTER (string
);
1490 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1493 /* Write the address of the entity given by SYMBOL to SEC. */
1495 assemble_addr_to_section (rtx symbol
, section
*sec
)
1497 switch_to_section (sec
);
1498 assemble_align (POINTER_SIZE
);
1499 assemble_integer (symbol
, POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
1502 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1503 not) section for PRIORITY. */
1505 get_cdtor_priority_section (int priority
, bool constructor_p
)
1509 /* ??? This only works reliably with the GNU linker. */
1510 sprintf (buf
, "%s.%.5u",
1511 constructor_p
? ".ctors" : ".dtors",
1512 /* Invert the numbering so the linker puts us in the proper
1513 order; constructors are run from right to left, and the
1514 linker sorts in increasing order. */
1515 MAX_INIT_PRIORITY
- priority
);
1516 return get_section (buf
, SECTION_WRITE
, NULL
);
1520 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1524 if (priority
!= DEFAULT_INIT_PRIORITY
)
1525 sec
= get_cdtor_priority_section (priority
,
1526 /*constructor_p=*/false);
1528 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1530 assemble_addr_to_section (symbol
, sec
);
1533 #ifdef DTORS_SECTION_ASM_OP
1535 default_dtor_section_asm_out_destructor (rtx symbol
,
1536 int priority ATTRIBUTE_UNUSED
)
1538 assemble_addr_to_section (symbol
, dtors_section
);
1543 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1547 if (priority
!= DEFAULT_INIT_PRIORITY
)
1548 sec
= get_cdtor_priority_section (priority
,
1549 /*constructor_p=*/true);
1551 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1553 assemble_addr_to_section (symbol
, sec
);
1556 #ifdef CTORS_SECTION_ASM_OP
1558 default_ctor_section_asm_out_constructor (rtx symbol
,
1559 int priority ATTRIBUTE_UNUSED
)
1561 assemble_addr_to_section (symbol
, ctors_section
);
1565 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1566 a nonzero value if the constant pool should be output before the
1567 start of the function, or a zero value if the pool should output
1568 after the end of the function. The default is to put it before the
1571 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1572 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1575 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1576 to be output to assembler.
1577 Set first_global_object_name and weak_global_object_name as appropriate. */
1580 notice_global_symbol (tree decl
)
1582 const char **type
= &first_global_object_name
;
1584 if (first_global_object_name
1585 || !TREE_PUBLIC (decl
)
1586 || DECL_EXTERNAL (decl
)
1587 || !DECL_NAME (decl
)
1588 || (TREE_CODE (decl
) != FUNCTION_DECL
1589 && (TREE_CODE (decl
) != VAR_DECL
1590 || (DECL_COMMON (decl
)
1591 && (DECL_INITIAL (decl
) == 0
1592 || DECL_INITIAL (decl
) == error_mark_node
))))
1593 || !MEM_P (DECL_RTL (decl
)))
1596 /* We win when global object is found, but it is useful to know about weak
1597 symbol as well so we can produce nicer unique names. */
1598 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1599 type
= &weak_global_object_name
;
1605 rtx decl_rtl
= DECL_RTL (decl
);
1607 p
= targetm
.strip_name_encoding (XSTR (XEXP (decl_rtl
, 0), 0));
1608 name
= ggc_strdup (p
);
1614 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1615 current function goes into the cold section, so that targets can use
1616 current_function_section during RTL expansion. DECL describes the
1620 decide_function_section (tree decl
)
1622 first_function_block_is_cold
= false;
1624 if (flag_reorder_blocks_and_partition
)
1625 /* We will decide in assemble_start_function. */
1628 if (DECL_SECTION_NAME (decl
))
1630 struct cgraph_node
*node
= cgraph_node::get (current_function_decl
);
1631 /* Calls to function_section rely on first_function_block_is_cold
1633 first_function_block_is_cold
= (node
1635 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1638 in_cold_section_p
= first_function_block_is_cold
;
1641 /* Output assembler code for the constant pool of a function and associated
1642 with defining the name of the function. DECL describes the function.
1643 NAME is the function's name. For the constant pool, we use the current
1644 constant pool data. */
1647 assemble_start_function (tree decl
, const char *fnname
)
1650 char tmp_label
[100];
1651 bool hot_label_written
= false;
1653 if (flag_reorder_blocks_and_partition
)
1655 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1656 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1657 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1658 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1659 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1660 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1661 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1662 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1667 crtl
->subsections
.hot_section_label
= NULL
;
1668 crtl
->subsections
.cold_section_label
= NULL
;
1669 crtl
->subsections
.hot_section_end_label
= NULL
;
1670 crtl
->subsections
.cold_section_end_label
= NULL
;
1673 /* The following code does not need preprocessing in the assembler. */
1677 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1678 output_constant_pool (fnname
, decl
);
1680 /* Make sure the not and cold text (code) sections are properly
1681 aligned. This is necessary here in the case where the function
1682 has both hot and cold sections, because we don't want to re-set
1683 the alignment when the section switch happens mid-function. */
1685 if (flag_reorder_blocks_and_partition
)
1687 first_function_block_is_cold
= false;
1689 switch_to_section (unlikely_text_section ());
1690 assemble_align (DECL_ALIGN (decl
));
1691 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1693 /* When the function starts with a cold section, we need to explicitly
1694 align the hot section and write out the hot section label.
1695 But if the current function is a thunk, we do not have a CFG. */
1697 && BB_PARTITION (ENTRY_BLOCK_PTR_FOR_FN (cfun
)->next_bb
) == BB_COLD_PARTITION
)
1699 switch_to_section (text_section
);
1700 assemble_align (DECL_ALIGN (decl
));
1701 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1702 hot_label_written
= true;
1703 first_function_block_is_cold
= true;
1705 in_cold_section_p
= first_function_block_is_cold
;
1709 /* Switch to the correct text section for the start of the function. */
1711 switch_to_section (function_section (decl
));
1712 if (flag_reorder_blocks_and_partition
1713 && !hot_label_written
)
1714 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1716 /* Tell assembler to move to target machine's alignment for functions. */
1717 align
= floor_log2 (DECL_ALIGN (decl
) / BITS_PER_UNIT
);
1720 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1723 /* Handle a user-specified function alignment.
1724 Note that we still need to align to DECL_ALIGN, as above,
1725 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1726 if (! DECL_USER_ALIGN (decl
)
1727 && align_functions_log
> align
1728 && optimize_function_for_speed_p (cfun
))
1730 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1731 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1732 align_functions_log
, align_functions
- 1);
1734 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1738 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1739 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1742 if (!DECL_IGNORED_P (decl
))
1743 (*debug_hooks
->begin_function
) (decl
);
1745 /* Make function name accessible from other files, if appropriate. */
1747 if (TREE_PUBLIC (decl
))
1749 notice_global_symbol (decl
);
1751 globalize_decl (decl
);
1753 maybe_assemble_visibility (decl
);
1756 if (DECL_PRESERVE_P (decl
))
1757 targetm
.asm_out
.mark_decl_preserved (fnname
);
1759 /* Do any machine/system dependent processing of the function name. */
1760 #ifdef ASM_DECLARE_FUNCTION_NAME
1761 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1763 /* Standard thing is just output label for the function. */
1764 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1765 #endif /* ASM_DECLARE_FUNCTION_NAME */
1767 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1768 saw_no_split_stack
= true;
1771 /* Output assembler code associated with defining the size of the
1772 function. DECL describes the function. NAME is the function's name. */
1775 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1777 #ifdef ASM_DECLARE_FUNCTION_SIZE
1778 /* We could have switched section in the middle of the function. */
1779 if (flag_reorder_blocks_and_partition
)
1780 switch_to_section (function_section (decl
));
1781 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1783 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1785 output_constant_pool (fnname
, decl
);
1786 switch_to_section (function_section (decl
)); /* need to switch back */
1788 /* Output labels for end of hot/cold text sections (to be used by
1790 if (flag_reorder_blocks_and_partition
)
1792 section
*save_text_section
;
1794 save_text_section
= in_section
;
1795 switch_to_section (unlikely_text_section ());
1796 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1797 if (first_function_block_is_cold
)
1798 switch_to_section (text_section
);
1800 switch_to_section (function_section (decl
));
1801 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1802 switch_to_section (save_text_section
);
1806 /* Assemble code to leave SIZE bytes of zeros. */
1809 assemble_zeros (unsigned HOST_WIDE_INT size
)
1811 /* Do no output if -fsyntax-only. */
1812 if (flag_syntax_only
)
1815 #ifdef ASM_NO_SKIP_IN_TEXT
1816 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1817 so we must output 0s explicitly in the text section. */
1818 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1820 unsigned HOST_WIDE_INT i
;
1821 for (i
= 0; i
< size
; i
++)
1822 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1827 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1830 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1833 assemble_align (int align
)
1835 if (align
> BITS_PER_UNIT
)
1837 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1841 /* Assemble a string constant with the specified C string as contents. */
1844 assemble_string (const char *p
, int size
)
1849 /* If the string is very long, split it up. */
1853 int thissize
= size
- pos
;
1854 if (thissize
> maximum
)
1857 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1865 /* A noswitch_section_callback for lcomm_section. */
1868 emit_local (tree decl ATTRIBUTE_UNUSED
,
1869 const char *name ATTRIBUTE_UNUSED
,
1870 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1871 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1873 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1874 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1875 size
, DECL_ALIGN (decl
));
1877 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1878 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1881 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1886 /* A noswitch_section_callback for bss_noswitch_section. */
1888 #if defined ASM_OUTPUT_ALIGNED_BSS
1890 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1891 const char *name ATTRIBUTE_UNUSED
,
1892 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1893 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1895 #if defined ASM_OUTPUT_ALIGNED_BSS
1896 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
,
1897 get_variable_align (decl
));
1903 /* A noswitch_section_callback for comm_section. */
1906 emit_common (tree decl ATTRIBUTE_UNUSED
,
1907 const char *name ATTRIBUTE_UNUSED
,
1908 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1909 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1911 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1912 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1913 size
, get_variable_align (decl
));
1915 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1916 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
,
1917 get_variable_align (decl
));
1920 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1925 /* A noswitch_section_callback for tls_comm_section. */
1928 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1929 const char *name ATTRIBUTE_UNUSED
,
1930 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1931 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1933 #ifdef ASM_OUTPUT_TLS_COMMON
1934 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
1937 sorry ("thread-local COMMON data not implemented");
1942 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1943 NAME is the name of DECL's SYMBOL_REF. */
1946 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
,
1949 unsigned HOST_WIDE_INT size
, rounded
;
1951 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
1954 if ((flag_sanitize
& SANITIZE_ADDRESS
) && asan_protect_global (decl
))
1955 size
+= asan_red_zone_size (size
);
1957 /* Don't allocate zero bytes of common,
1958 since that means "undefined external" in the linker. */
1962 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1963 so that each uninitialized object starts on such a boundary. */
1964 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
1965 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
1966 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
1968 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
1969 && (unsigned HOST_WIDE_INT
) (align
/ BITS_PER_UNIT
) > rounded
)
1970 error ("requested alignment for %q+D is greater than "
1971 "implemented alignment of %wu", decl
, rounded
);
1974 /* A subroutine of assemble_variable. Output the label and contents of
1975 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1976 is as for assemble_variable. */
1979 assemble_variable_contents (tree decl
, const char *name
,
1980 bool dont_output_data
)
1982 /* Do any machine/system dependent processing of the object. */
1983 #ifdef ASM_DECLARE_OBJECT_NAME
1984 last_assemble_variable_decl
= decl
;
1985 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
1987 /* Standard thing is just output label for the object. */
1988 ASM_OUTPUT_LABEL (asm_out_file
, name
);
1989 #endif /* ASM_DECLARE_OBJECT_NAME */
1991 if (!dont_output_data
)
1993 /* Caller is supposed to use varpool_get_constructor when it wants
1994 to output the body. */
1995 gcc_assert (!in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
);
1996 if (DECL_INITIAL (decl
)
1997 && DECL_INITIAL (decl
) != error_mark_node
1998 && !initializer_zerop (DECL_INITIAL (decl
)))
1999 /* Output the actual data. */
2000 output_constant (DECL_INITIAL (decl
),
2001 tree_to_uhwi (DECL_SIZE_UNIT (decl
)),
2002 get_variable_align (decl
));
2004 /* Leave space for it. */
2005 assemble_zeros (tree_to_uhwi (DECL_SIZE_UNIT (decl
)));
2009 /* Assemble everything that is needed for a variable or function declaration.
2010 Not used for automatic variables, and not used for function definitions.
2011 Should not be called for variables of incomplete structure type.
2013 TOP_LEVEL is nonzero if this variable has file scope.
2014 AT_END is nonzero if this is the special handling, at end of compilation,
2015 to define things that have had only tentative definitions.
2016 DONT_OUTPUT_DATA if nonzero means don't actually output the
2017 initial value (that will be done by the caller). */
2020 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
2021 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
2024 rtx decl_rtl
, symbol
;
2027 bool asan_protected
= false;
2029 /* This function is supposed to handle VARIABLES. Ensure we have one. */
2030 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
2032 /* Emulated TLS had better not get this far. */
2033 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
2035 last_assemble_variable_decl
= 0;
2037 /* Normally no need to say anything here for external references,
2038 since assemble_external is called by the language-specific code
2039 when a declaration is first seen. */
2041 if (DECL_EXTERNAL (decl
))
2044 /* Do nothing for global register variables. */
2045 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
2047 TREE_ASM_WRITTEN (decl
) = 1;
2051 /* If type was incomplete when the variable was declared,
2052 see if it is complete now. */
2054 if (DECL_SIZE (decl
) == 0)
2055 layout_decl (decl
, 0);
2057 /* Still incomplete => don't allocate it; treat the tentative defn
2058 (which is what it must have been) as an `extern' reference. */
2060 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2062 error ("storage size of %q+D isn%'t known", decl
);
2063 TREE_ASM_WRITTEN (decl
) = 1;
2067 /* The first declaration of a variable that comes through this function
2068 decides whether it is global (in C, has external linkage)
2069 or local (in C, has internal linkage). So do nothing more
2070 if this function has already run. */
2072 if (TREE_ASM_WRITTEN (decl
))
2075 /* Make sure targetm.encode_section_info is invoked before we set
2077 decl_rtl
= DECL_RTL (decl
);
2079 TREE_ASM_WRITTEN (decl
) = 1;
2081 /* Do no output if -fsyntax-only. */
2082 if (flag_syntax_only
)
2085 if (! dont_output_data
2086 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
2088 error ("size of variable %q+D is too large", decl
);
2092 gcc_assert (MEM_P (decl_rtl
));
2093 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2094 symbol
= XEXP (decl_rtl
, 0);
2096 /* If this symbol belongs to the tree constant pool, output the constant
2097 if it hasn't already been written. */
2098 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
2100 tree decl
= SYMBOL_REF_DECL (symbol
);
2101 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
2102 output_constant_def_contents (symbol
);
2108 name
= XSTR (symbol
, 0);
2109 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2110 notice_global_symbol (decl
);
2112 /* Compute the alignment of this data. */
2114 align_variable (decl
, dont_output_data
);
2116 if ((flag_sanitize
& SANITIZE_ADDRESS
)
2117 && asan_protect_global (decl
))
2119 asan_protected
= true;
2120 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
2121 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
2124 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2126 align
= get_variable_align (decl
);
2128 if (TREE_PUBLIC (decl
))
2129 maybe_assemble_visibility (decl
);
2131 if (DECL_PRESERVE_P (decl
))
2132 targetm
.asm_out
.mark_decl_preserved (name
);
2134 /* First make the assembler name(s) global if appropriate. */
2135 sect
= get_variable_section (decl
, false);
2136 if (TREE_PUBLIC (decl
)
2137 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2138 globalize_decl (decl
);
2140 /* Output any data that we will need to use the address of. */
2141 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2142 output_addressed_constants (DECL_INITIAL (decl
));
2144 /* dbxout.c needs to know this. */
2145 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2146 DECL_IN_TEXT_SECTION (decl
) = 1;
2148 /* If the decl is part of an object_block, make sure that the decl
2149 has been positioned within its block, but do not write out its
2150 definition yet. output_object_blocks will do that later. */
2151 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2153 gcc_assert (!dont_output_data
);
2154 place_block_symbol (symbol
);
2156 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2157 assemble_noswitch_variable (decl
, name
, sect
, align
);
2160 /* The following bit of code ensures that vtable_map
2161 variables are not only in the comdat section, but that
2162 each variable has its own unique comdat name. If this
2163 code is removed, the variables end up in the same section
2164 with a single comdat name.
2166 FIXME: resolve_unique_section needs to deal better with
2167 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
2168 that is fixed, this if-else statement can be replaced with
2169 a single call to "switch_to_section (sect)". */
2170 if (sect
->named
.name
2171 && (strcmp (sect
->named
.name
, ".vtable_map_vars") == 0))
2173 #if defined (OBJECT_FORMAT_ELF)
2174 targetm
.asm_out
.named_section (sect
->named
.name
,
2175 sect
->named
.common
.flags
2180 switch_to_section (sect
);
2184 switch_to_section (sect
);
2185 if (align
> BITS_PER_UNIT
)
2186 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
2187 assemble_variable_contents (decl
, name
, dont_output_data
);
2190 unsigned HOST_WIDE_INT
int size
2191 = tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2192 assemble_zeros (asan_red_zone_size (size
));
2198 /* Given a function declaration (FN_DECL), this function assembles the
2199 function into the .preinit_array section. */
2202 assemble_vtv_preinit_initializer (tree fn_decl
)
2205 unsigned flags
= SECTION_WRITE
;
2206 rtx symbol
= XEXP (DECL_RTL (fn_decl
), 0);
2208 flags
|= SECTION_NOTYPE
;
2209 sect
= get_section (".preinit_array", flags
, fn_decl
);
2210 switch_to_section (sect
);
2211 assemble_addr_to_section (symbol
, sect
);
2214 /* Return 1 if type TYPE contains any pointers. */
2217 contains_pointers_p (tree type
)
2219 switch (TREE_CODE (type
))
2222 case REFERENCE_TYPE
:
2223 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2224 so I'll play safe and return 1. */
2230 case QUAL_UNION_TYPE
:
2233 /* For a type that has fields, see if the fields have pointers. */
2234 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2235 if (TREE_CODE (fields
) == FIELD_DECL
2236 && contains_pointers_p (TREE_TYPE (fields
)))
2242 /* An array type contains pointers if its element type does. */
2243 return contains_pointers_p (TREE_TYPE (type
));
2250 /* We delay assemble_external processing until
2251 the compilation unit is finalized. This is the best we can do for
2252 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2253 it all the way to final. See PR 17982 for further discussion. */
2254 static GTY(()) tree pending_assemble_externals
;
2256 #ifdef ASM_OUTPUT_EXTERNAL
2257 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2258 As a result, assemble_external can be called after the list of externals
2259 is processed and the pointer set destroyed. */
2260 static bool pending_assemble_externals_processed
;
2262 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2263 TREE_LIST in assemble_external. */
2264 static hash_set
<tree
> *pending_assemble_externals_set
;
2266 /* True if DECL is a function decl for which no out-of-line copy exists.
2267 It is assumed that DECL's assembler name has been set. */
2270 incorporeal_function_p (tree decl
)
2272 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2276 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2277 && (DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
2278 || DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA_WITH_ALIGN
))
2281 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2282 /* Atomic or sync builtins which have survived this far will be
2283 resolved externally and therefore are not incorporeal. */
2284 if (strncmp (name
, "__builtin_", 10) == 0)
2290 /* Actually do the tests to determine if this is necessary, and invoke
2291 ASM_OUTPUT_EXTERNAL. */
2293 assemble_external_real (tree decl
)
2295 rtx rtl
= DECL_RTL (decl
);
2297 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2298 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2299 && !incorporeal_function_p (decl
))
2301 /* Some systems do require some output. */
2302 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2303 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2309 process_pending_assemble_externals (void)
2311 #ifdef ASM_OUTPUT_EXTERNAL
2313 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2314 assemble_external_real (TREE_VALUE (list
));
2316 pending_assemble_externals
= 0;
2317 pending_assemble_externals_processed
= true;
2318 delete pending_assemble_externals_set
;
2322 /* This TREE_LIST contains any weak symbol declarations waiting
2324 static GTY(()) tree weak_decls
;
2326 /* Output something to declare an external symbol to the assembler,
2327 and qualifiers such as weakness. (Most assemblers don't need
2328 extern declaration, so we normally output nothing.) Do nothing if
2329 DECL is not external. */
2332 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2334 /* Make sure that the ASM_OUT_FILE is open.
2335 If it's not, we should not be calling this function. */
2336 gcc_assert (asm_out_file
);
2338 /* In a perfect world, the following condition would be true.
2339 Sadly, the Java and Go front ends emit assembly *from the front end*,
2340 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2342 /* This function should only be called if we are expanding, or have
2344 Ideally, only final.c would be calling this function, but it is
2345 not clear whether that would break things somehow. See PR 17982
2346 for further discussion. */
2347 gcc_assert (state
== EXPANSION
2348 || state
== FINISHED
);
2351 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2354 /* We want to output annotation for weak and external symbols at
2355 very last to check if they are references or not. */
2357 if (TARGET_SUPPORTS_WEAK
2359 /* TREE_STATIC is a weird and abused creature which is not
2360 generally the right test for whether an entity has been
2361 locally emitted, inlined or otherwise not-really-extern, but
2362 for declarations that can be weak, it happens to be
2364 && !TREE_STATIC (decl
)
2365 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2366 && value_member (decl
, weak_decls
) == NULL_TREE
)
2367 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2369 #ifdef ASM_OUTPUT_EXTERNAL
2370 if (pending_assemble_externals_processed
)
2372 assemble_external_real (decl
);
2376 if (! pending_assemble_externals_set
->add (decl
))
2377 pending_assemble_externals
= tree_cons (NULL
, decl
,
2378 pending_assemble_externals
);
2382 /* Similar, for calling a library function FUN. */
2385 assemble_external_libcall (rtx fun
)
2387 /* Declare library function name external when first used, if nec. */
2388 if (! SYMBOL_REF_USED (fun
))
2390 SYMBOL_REF_USED (fun
) = 1;
2391 targetm
.asm_out
.external_libcall (fun
);
2395 /* Assemble a label named NAME. */
2398 assemble_label (FILE *file
, const char *name
)
2400 ASM_OUTPUT_LABEL (file
, name
);
2403 /* Set the symbol_referenced flag for ID. */
2405 mark_referenced (tree id
)
2407 TREE_SYMBOL_REFERENCED (id
) = 1;
2410 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2412 mark_decl_referenced (tree decl
)
2414 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2416 /* Extern inline functions don't become needed when referenced.
2417 If we know a method will be emitted in other TU and no new
2418 functions can be marked reachable, just use the external
2420 struct cgraph_node
*node
= cgraph_node::get_create (decl
);
2421 if (!DECL_EXTERNAL (decl
)
2422 && !node
->definition
)
2423 node
->mark_force_output ();
2425 else if (TREE_CODE (decl
) == VAR_DECL
)
2427 varpool_node
*node
= varpool_node::get_create (decl
);
2428 /* C++ frontend use mark_decl_references to force COMDAT variables
2429 to be output that might appear dead otherwise. */
2430 node
->force_output
= true;
2432 /* else do nothing - we can get various sorts of CST nodes here,
2433 which do not need to be marked. */
2437 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2438 until we find an identifier that is not itself a transparent alias.
2439 Modify the alias passed to it by reference (and all aliases on the
2440 way to the ultimate target), such that they do not have to be
2441 followed again, and return the ultimate target of the alias
2445 ultimate_transparent_alias_target (tree
*alias
)
2447 tree target
= *alias
;
2449 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
2451 gcc_assert (TREE_CHAIN (target
));
2452 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
2453 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
2454 && ! TREE_CHAIN (target
));
2461 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2462 starts with a *, the rest of NAME is output verbatim. Otherwise
2463 NAME is transformed in a target-specific way (usually by the
2464 addition of an underscore). */
2467 assemble_name_raw (FILE *file
, const char *name
)
2470 fputs (&name
[1], file
);
2472 ASM_OUTPUT_LABELREF (file
, name
);
2475 /* Like assemble_name_raw, but should be used when NAME might refer to
2476 an entity that is also represented as a tree (like a function or
2477 variable). If NAME does refer to such an entity, that entity will
2478 be marked as referenced. */
2481 assemble_name (FILE *file
, const char *name
)
2483 const char *real_name
;
2486 real_name
= targetm
.strip_name_encoding (name
);
2488 id
= maybe_get_identifier (real_name
);
2493 mark_referenced (id
);
2494 ultimate_transparent_alias_target (&id
);
2496 name
= IDENTIFIER_POINTER (id
);
2497 gcc_assert (! TREE_CHAIN (id
));
2500 assemble_name_raw (file
, name
);
2503 /* Allocate SIZE bytes writable static space with a gensym name
2504 and return an RTX to refer to its address. */
2507 assemble_static_space (unsigned HOST_WIDE_INT size
)
2510 const char *namestring
;
2513 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2515 namestring
= ggc_strdup (name
);
2517 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2518 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2520 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2521 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2524 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2525 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2528 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2529 so that each uninitialized object starts on such a boundary. */
2530 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2531 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2532 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2533 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2534 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2535 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2542 /* Assemble the static constant template for function entry trampolines.
2543 This is done at most once per compilation.
2544 Returns an RTX for the address of the template. */
2546 static GTY(()) rtx initial_trampoline
;
2549 assemble_trampoline_template (void)
2556 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2558 if (initial_trampoline
)
2559 return initial_trampoline
;
2561 /* By default, put trampoline templates in read-only data section. */
2563 #ifdef TRAMPOLINE_SECTION
2564 switch_to_section (TRAMPOLINE_SECTION
);
2566 switch_to_section (readonly_data_section
);
2569 /* Write the assembler code to define one. */
2570 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2572 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2574 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2575 targetm
.asm_out
.trampoline_template (asm_out_file
);
2577 /* Record the rtl to refer to it. */
2578 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2579 name
= ggc_strdup (label
);
2580 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2581 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2583 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2584 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2585 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2587 return initial_trampoline
;
2590 /* A and B are either alignments or offsets. Return the minimum alignment
2591 that may be assumed after adding the two together. */
2593 static inline unsigned
2594 min_align (unsigned int a
, unsigned int b
)
2596 return (a
| b
) & -(a
| b
);
2599 /* Return the assembler directive for creating a given kind of integer
2600 object. SIZE is the number of bytes in the object and ALIGNED_P
2601 indicates whether it is known to be aligned. Return NULL if the
2602 assembly dialect has no such directive.
2604 The returned string should be printed at the start of a new line and
2605 be followed immediately by the object's initial value. */
2608 integer_asm_op (int size
, int aligned_p
)
2610 struct asm_int_op
*ops
;
2613 ops
= &targetm
.asm_out
.aligned_op
;
2615 ops
= &targetm
.asm_out
.unaligned_op
;
2620 return targetm
.asm_out
.byte_op
;
2634 /* Use directive OP to assemble an integer object X. Print OP at the
2635 start of the line, followed immediately by the value of X. */
2638 assemble_integer_with_op (const char *op
, rtx x
)
2640 fputs (op
, asm_out_file
);
2641 output_addr_const (asm_out_file
, x
);
2642 fputc ('\n', asm_out_file
);
2645 /* The default implementation of the asm_out.integer target hook. */
2648 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2649 unsigned int size ATTRIBUTE_UNUSED
,
2650 int aligned_p ATTRIBUTE_UNUSED
)
2652 const char *op
= integer_asm_op (size
, aligned_p
);
2653 /* Avoid GAS bugs for large values. Specifically negative values whose
2654 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2655 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE_UNITS
)
2657 return op
&& (assemble_integer_with_op (op
, x
), true);
2660 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2661 the alignment of the integer in bits. Return 1 if we were able to output
2662 the constant, otherwise 0. We must be able to output the constant,
2663 if FORCE is nonzero. */
2666 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2670 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2672 /* See if the target hook can handle this kind of object. */
2673 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2676 /* If the object is a multi-byte one, try splitting it up. Split
2677 it into words it if is multi-word, otherwise split it into bytes. */
2680 enum machine_mode omode
, imode
;
2681 unsigned int subalign
;
2682 unsigned int subsize
, i
;
2683 enum mode_class mclass
;
2685 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2686 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2687 if (GET_CODE (x
) == CONST_FIXED
)
2688 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2692 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2693 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2695 for (i
= 0; i
< size
; i
+= subsize
)
2697 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2698 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2704 /* If we've printed some of it, but not all of it, there's no going
2709 gcc_assert (!force
);
2715 assemble_real (REAL_VALUE_TYPE d
, enum machine_mode mode
, unsigned int align
)
2717 long data
[4] = {0, 0, 0, 0};
2719 int bitsize
, nelts
, nunits
, units_per
;
2721 /* This is hairy. We have a quantity of known size. real_to_target
2722 will put it into an array of *host* longs, 32 bits per element
2723 (even if long is more than 32 bits). We need to determine the
2724 number of array elements that are occupied (nelts) and the number
2725 of *target* min-addressable units that will be occupied in the
2726 object file (nunits). We cannot assume that 32 divides the
2727 mode's bitsize (size * BITS_PER_UNIT) evenly.
2729 size * BITS_PER_UNIT is used here to make sure that padding bits
2730 (which might appear at either end of the value; real_to_target
2731 will include the padding bits in its output array) are included. */
2733 nunits
= GET_MODE_SIZE (mode
);
2734 bitsize
= nunits
* BITS_PER_UNIT
;
2735 nelts
= CEIL (bitsize
, 32);
2736 units_per
= 32 / BITS_PER_UNIT
;
2738 real_to_target (data
, &d
, mode
);
2740 /* Put out the first word with the specified alignment. */
2741 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2742 nunits
-= units_per
;
2744 /* Subsequent words need only 32-bit alignment. */
2745 align
= min_align (align
, 32);
2747 for (i
= 1; i
< nelts
; i
++)
2749 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2750 nunits
-= units_per
;
2754 /* Given an expression EXP with a constant value,
2755 reduce it to the sum of an assembler symbol and an integer.
2756 Store them both in the structure *VALUE.
2757 EXP must be reducible. */
2761 HOST_WIDE_INT offset
;
2765 decode_addr_const (tree exp
, struct addr_const
*value
)
2767 tree target
= TREE_OPERAND (exp
, 0);
2773 if (TREE_CODE (target
) == COMPONENT_REF
2774 && tree_fits_shwi_p (byte_position (TREE_OPERAND (target
, 1))))
2776 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2777 target
= TREE_OPERAND (target
, 0);
2779 else if (TREE_CODE (target
) == ARRAY_REF
2780 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2782 offset
+= (tree_to_uhwi (TYPE_SIZE_UNIT (TREE_TYPE (target
)))
2783 * tree_to_shwi (TREE_OPERAND (target
, 1)));
2784 target
= TREE_OPERAND (target
, 0);
2786 else if (TREE_CODE (target
) == MEM_REF
2787 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2789 offset
+= mem_ref_offset (target
).to_short_addr ();
2790 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2792 else if (TREE_CODE (target
) == INDIRECT_REF
2793 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2794 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2796 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2801 switch (TREE_CODE (target
))
2805 x
= DECL_RTL (target
);
2809 x
= gen_rtx_MEM (FUNCTION_MODE
,
2810 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2819 x
= output_constant_def (target
, 1);
2826 gcc_assert (MEM_P (x
));
2830 value
->offset
= offset
;
2833 static GTY(()) hash_table
<tree_descriptor_hasher
> *const_desc_htab
;
2835 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2837 /* Constant pool accessor function. */
2839 hash_table
<tree_descriptor_hasher
> *
2840 constant_pool_htab (void)
2842 return const_desc_htab
;
2845 /* Compute a hash code for a constant expression. */
2848 tree_descriptor_hasher::hash (constant_descriptor_tree
*ptr
)
2854 const_hash_1 (const tree exp
)
2859 enum tree_code code
= TREE_CODE (exp
);
2861 /* Either set P and LEN to the address and len of something to hash and
2862 exit the switch or return a value. */
2867 p
= (char *) &TREE_INT_CST_ELT (exp
, 0);
2868 len
= TREE_INT_CST_NUNITS (exp
) * sizeof (HOST_WIDE_INT
);
2872 return real_hash (TREE_REAL_CST_PTR (exp
));
2875 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2878 p
= TREE_STRING_POINTER (exp
);
2879 len
= TREE_STRING_LENGTH (exp
);
2883 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2884 + const_hash_1 (TREE_IMAGPART (exp
)));
2890 hi
= 7 + VECTOR_CST_NELTS (exp
);
2892 for (i
= 0; i
< VECTOR_CST_NELTS (exp
); ++i
)
2893 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ELT (exp
, i
));
2900 unsigned HOST_WIDE_INT idx
;
2903 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2905 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2907 hi
= hi
* 603 + const_hash_1 (value
);
2915 struct addr_const value
;
2917 decode_addr_const (exp
, &value
);
2918 switch (GET_CODE (value
.base
))
2921 /* Don't hash the address of the SYMBOL_REF;
2922 only use the offset and the symbol name. */
2924 p
= XSTR (value
.base
, 0);
2925 for (i
= 0; p
[i
] != 0; i
++)
2926 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2931 + CODE_LABEL_NUMBER (LABEL_REF_LABEL (value
.base
)) * 13);
2941 case POINTER_PLUS_EXPR
:
2943 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2944 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2947 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2950 /* A language specific constant. Just hash the code. */
2954 /* Compute hashing function. */
2956 for (i
= 0; i
< len
; i
++)
2957 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2962 /* Wrapper of compare_constant, for the htab interface. */
2964 tree_descriptor_hasher::equal (constant_descriptor_tree
*c1
,
2965 constant_descriptor_tree
*c2
)
2967 if (c1
->hash
!= c2
->hash
)
2969 return compare_constant (c1
->value
, c2
->value
);
2972 /* Compare t1 and t2, and return 1 only if they are known to result in
2973 the same bit pattern on output. */
2976 compare_constant (const tree t1
, const tree t2
)
2978 enum tree_code typecode
;
2980 if (t1
== NULL_TREE
)
2981 return t2
== NULL_TREE
;
2982 if (t2
== NULL_TREE
)
2985 if (TREE_CODE (t1
) != TREE_CODE (t2
))
2988 switch (TREE_CODE (t1
))
2991 /* Integer constants are the same only if the same width of type. */
2992 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2994 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2996 return tree_int_cst_equal (t1
, t2
);
2999 /* Real constants are the same only if the same width of type. */
3000 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3003 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
3006 /* Fixed constants are the same only if the same width of type. */
3007 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3010 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
3013 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3016 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
3017 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
3018 TREE_STRING_LENGTH (t1
)));
3021 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
3022 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
3028 if (VECTOR_CST_NELTS (t1
) != VECTOR_CST_NELTS (t2
))
3031 for (i
= 0; i
< VECTOR_CST_NELTS (t1
); ++i
)
3032 if (!compare_constant (VECTOR_CST_ELT (t1
, i
),
3033 VECTOR_CST_ELT (t2
, i
)))
3041 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
3042 unsigned HOST_WIDE_INT idx
;
3044 typecode
= TREE_CODE (TREE_TYPE (t1
));
3045 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
3048 if (typecode
== ARRAY_TYPE
)
3050 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
3051 /* For arrays, check that the sizes all match. */
3052 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
3054 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
3059 /* For record and union constructors, require exact type
3061 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
3065 v1
= CONSTRUCTOR_ELTS (t1
);
3066 v2
= CONSTRUCTOR_ELTS (t2
);
3067 if (vec_safe_length (v1
) != vec_safe_length (v2
))
3070 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
3072 constructor_elt
*c1
= &(*v1
)[idx
];
3073 constructor_elt
*c2
= &(*v2
)[idx
];
3075 /* Check that each value is the same... */
3076 if (!compare_constant (c1
->value
, c2
->value
))
3078 /* ... and that they apply to the same fields! */
3079 if (typecode
== ARRAY_TYPE
)
3081 if (!compare_constant (c1
->index
, c2
->index
))
3086 if (c1
->index
!= c2
->index
)
3097 struct addr_const value1
, value2
;
3101 decode_addr_const (t1
, &value1
);
3102 decode_addr_const (t2
, &value2
);
3104 if (value1
.offset
!= value2
.offset
)
3107 code
= GET_CODE (value1
.base
);
3108 if (code
!= GET_CODE (value2
.base
))
3114 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3118 ret
= (CODE_LABEL_NUMBER (LABEL_REF_LABEL (value1
.base
))
3119 == CODE_LABEL_NUMBER (LABEL_REF_LABEL (value2
.base
)));
3129 case POINTER_PLUS_EXPR
:
3132 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3133 && compare_constant (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3136 case VIEW_CONVERT_EXPR
:
3137 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3146 /* Return the section into which constant EXP should be placed. */
3149 get_constant_section (tree exp
, unsigned int align
)
3151 return targetm
.asm_out
.select_section (exp
,
3152 compute_reloc_for_constant (exp
),
3156 /* Return the size of constant EXP in bytes. */
3158 static HOST_WIDE_INT
3159 get_constant_size (tree exp
)
3163 size
= int_size_in_bytes (TREE_TYPE (exp
));
3164 if (TREE_CODE (exp
) == STRING_CST
)
3165 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3169 /* Subroutine of output_constant_def:
3170 No constant equal to EXP is known to have been output.
3171 Make a constant descriptor to enter EXP in the hash table.
3172 Assign the label number and construct RTL to refer to the
3173 constant's location in memory.
3174 Caller is responsible for updating the hash table. */
3176 static struct constant_descriptor_tree
*
3177 build_constant_desc (tree exp
)
3179 struct constant_descriptor_tree
*desc
;
3185 desc
= ggc_alloc
<constant_descriptor_tree
> ();
3188 /* Create a string containing the label name, in LABEL. */
3189 labelno
= const_labelno
++;
3190 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3192 /* Construct the VAR_DECL associated with the constant. */
3193 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3195 DECL_ARTIFICIAL (decl
) = 1;
3196 DECL_IGNORED_P (decl
) = 1;
3197 TREE_READONLY (decl
) = 1;
3198 TREE_STATIC (decl
) = 1;
3199 TREE_ADDRESSABLE (decl
) = 1;
3200 /* We don't set the RTL yet as this would cause varpool to assume that the
3201 variable is referenced. Moreover, it would just be dropped in LTO mode.
3202 Instead we set the flag that will be recognized in make_decl_rtl. */
3203 DECL_IN_CONSTANT_POOL (decl
) = 1;
3204 DECL_INITIAL (decl
) = desc
->value
;
3205 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3206 architectures so use DATA_ALIGNMENT as well, except for strings. */
3207 if (TREE_CODE (exp
) == STRING_CST
)
3209 #ifdef CONSTANT_ALIGNMENT
3210 DECL_ALIGN (decl
) = CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
));
3214 align_variable (decl
, 0);
3216 /* Now construct the SYMBOL_REF and the MEM. */
3217 if (use_object_blocks_p ())
3219 section
*sect
= get_constant_section (exp
, DECL_ALIGN (decl
));
3220 symbol
= create_block_symbol (ggc_strdup (label
),
3221 get_block_for_section (sect
), -1);
3224 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3225 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3226 SET_SYMBOL_REF_DECL (symbol
, decl
);
3227 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3229 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3230 set_mem_attributes (rtl
, exp
, 1);
3231 set_mem_alias_set (rtl
, 0);
3233 /* We cannot share RTX'es in pool entries.
3234 Mark this piece of RTL as required for unsharing. */
3235 RTX_FLAG (rtl
, used
) = 1;
3237 /* Set flags or add text to the name to record information, such as
3238 that it is a local symbol. If the name is changed, the macro
3239 ASM_OUTPUT_LABELREF will have to know how to strip this
3240 information. This call might invalidate our local variable
3241 SYMBOL; we can't use it afterward. */
3242 targetm
.encode_section_info (exp
, rtl
, true);
3249 /* Return an rtx representing a reference to constant data in memory
3250 for the constant expression EXP.
3252 If assembler code for such a constant has already been output,
3253 return an rtx to refer to it.
3254 Otherwise, output such a constant in memory
3255 and generate an rtx for it.
3257 If DEFER is nonzero, this constant can be deferred and output only
3258 if referenced in the function after all optimizations.
3260 `const_desc_table' records which constants already have label strings. */
3263 output_constant_def (tree exp
, int defer
)
3265 struct constant_descriptor_tree
*desc
;
3266 struct constant_descriptor_tree key
;
3268 /* Look up EXP in the table of constant descriptors. If we didn't find
3269 it, create a new one. */
3271 key
.hash
= const_hash_1 (exp
);
3272 constant_descriptor_tree
**loc
3273 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3278 desc
= build_constant_desc (exp
);
3279 desc
->hash
= key
.hash
;
3283 maybe_output_constant_def_contents (desc
, defer
);
3287 /* Subroutine of output_constant_def: Decide whether or not we need to
3288 output the constant DESC now, and if so, do it. */
3290 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3293 rtx symbol
= XEXP (desc
->rtl
, 0);
3294 tree exp
= desc
->value
;
3296 if (flag_syntax_only
)
3299 if (TREE_ASM_WRITTEN (exp
))
3300 /* Already output; don't do it again. */
3303 /* We can always defer constants as long as the context allows
3307 /* Increment n_deferred_constants if it exists. It needs to be at
3308 least as large as the number of constants actually referred to
3309 by the function. If it's too small we'll stop looking too early
3310 and fail to emit constants; if it's too large we'll only look
3311 through the entire function when we could have stopped earlier. */
3313 n_deferred_constants
++;
3317 output_constant_def_contents (symbol
);
3320 /* Subroutine of output_constant_def_contents. Output the definition
3321 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3322 constant's alignment in bits. */
3325 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3329 size
= get_constant_size (exp
);
3331 /* Do any machine/system dependent processing of the constant. */
3332 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3334 /* Output the value of EXP. */
3335 output_constant (exp
, size
, align
);
3338 /* We must output the constant data referred to by SYMBOL; do so. */
3341 output_constant_def_contents (rtx symbol
)
3343 tree decl
= SYMBOL_REF_DECL (symbol
);
3344 tree exp
= DECL_INITIAL (decl
);
3346 bool asan_protected
= false;
3348 /* Make sure any other constants whose addresses appear in EXP
3349 are assigned label numbers. */
3350 output_addressed_constants (exp
);
3352 /* We are no longer deferring this constant. */
3353 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3355 if ((flag_sanitize
& SANITIZE_ADDRESS
)
3356 && TREE_CODE (exp
) == STRING_CST
3357 && asan_protect_global (exp
))
3359 asan_protected
= true;
3360 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
3361 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
3364 /* If the constant is part of an object block, make sure that the
3365 decl has been positioned within its block, but do not write out
3366 its definition yet. output_object_blocks will do that later. */
3367 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3368 place_block_symbol (symbol
);
3371 align
= DECL_ALIGN (decl
);
3372 switch_to_section (get_constant_section (exp
, align
));
3373 if (align
> BITS_PER_UNIT
)
3374 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3375 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3378 HOST_WIDE_INT size
= get_constant_size (exp
);
3379 assemble_zeros (asan_red_zone_size (size
));
3384 /* Look up EXP in the table of constant descriptors. Return the rtl
3385 if it has been emitted, else null. */
3388 lookup_constant_def (tree exp
)
3390 struct constant_descriptor_tree key
;
3393 key
.hash
= const_hash_1 (exp
);
3394 constant_descriptor_tree
*desc
3395 = const_desc_htab
->find_with_hash (&key
, key
.hash
);
3397 return (desc
? desc
->rtl
: NULL_RTX
);
3400 /* Return a tree representing a reference to constant data in memory
3401 for the constant expression EXP.
3403 This is the counterpart of output_constant_def at the Tree level. */
3406 tree_output_constant_def (tree exp
)
3408 struct constant_descriptor_tree
*desc
, key
;
3411 /* Look up EXP in the table of constant descriptors. If we didn't find
3412 it, create a new one. */
3414 key
.hash
= const_hash_1 (exp
);
3415 constant_descriptor_tree
**loc
3416 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3421 desc
= build_constant_desc (exp
);
3422 desc
->hash
= key
.hash
;
3426 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3427 varpool_node::finalize_decl (decl
);
3431 struct GTY((chain_next ("%h.next"), for_user
)) constant_descriptor_rtx
{
3432 struct constant_descriptor_rtx
*next
;
3436 HOST_WIDE_INT offset
;
3438 enum machine_mode mode
;
3444 struct const_rtx_desc_hasher
: ggc_hasher
<constant_descriptor_rtx
*>
3446 static hashval_t
hash (constant_descriptor_rtx
*);
3447 static bool equal (constant_descriptor_rtx
*, constant_descriptor_rtx
*);
3450 /* Used in the hash tables to avoid outputting the same constant
3451 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3452 are output once per function, not once per file. */
3453 /* ??? Only a few targets need per-function constant pools. Most
3454 can use one per-file pool. Should add a targetm bit to tell the
3457 struct GTY(()) rtx_constant_pool
{
3458 /* Pointers to first and last constant in pool, as ordered by offset. */
3459 struct constant_descriptor_rtx
*first
;
3460 struct constant_descriptor_rtx
*last
;
3462 /* Hash facility for making memory-constants from constant rtl-expressions.
3463 It is used on RISC machines where immediate integer arguments and
3464 constant addresses are restricted so that such constants must be stored
3466 hash_table
<const_rtx_desc_hasher
> *const_rtx_htab
;
3468 /* Current offset in constant pool (does not include any
3469 machine-specific header). */
3470 HOST_WIDE_INT offset
;
3473 /* Hash and compare functions for const_rtx_htab. */
3476 const_rtx_desc_hasher::hash (constant_descriptor_rtx
*desc
)
3482 const_rtx_desc_hasher::equal (constant_descriptor_rtx
*x
,
3483 constant_descriptor_rtx
*y
)
3485 if (x
->mode
!= y
->mode
)
3487 return rtx_equal_p (x
->constant
, y
->constant
);
3490 /* Hash one component of a constant. */
3493 const_rtx_hash_1 (const_rtx x
)
3495 unsigned HOST_WIDE_INT hwi
;
3496 enum machine_mode mode
;
3501 code
= GET_CODE (x
);
3502 mode
= GET_MODE (x
);
3503 h
= (hashval_t
) code
* 1048573 + mode
;
3512 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3513 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3515 h
^= (hashval_t
) hwi
;
3516 for (i
= 1; i
< n
; ++i
)
3519 h
^= (hashval_t
) hwi
;
3524 case CONST_WIDE_INT
:
3525 hwi
= GET_MODE_PRECISION (mode
);
3527 for (i
= 0; i
< CONST_WIDE_INT_NUNITS (x
); i
++)
3528 hwi
^= CONST_WIDE_INT_ELT (x
, i
);
3533 if (TARGET_SUPPORTS_WIDE_INT
== 0 && mode
== VOIDmode
)
3535 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3539 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3543 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3547 h
^= htab_hash_string (XSTR (x
, 0));
3551 h
= h
* 251 + CODE_LABEL_NUMBER (LABEL_REF_LABEL (x
));
3555 case UNSPEC_VOLATILE
:
3556 h
= h
* 251 + XINT (x
, 1);
3566 /* Compute a hash value for X, which should be a constant. */
3569 const_rtx_hash (rtx x
)
3572 subrtx_iterator::array_type array
;
3573 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
3574 h
= h
* 509 + const_rtx_hash_1 (*iter
);
3579 /* Create and return a new rtx constant pool. */
3581 static struct rtx_constant_pool
*
3582 create_constant_pool (void)
3584 struct rtx_constant_pool
*pool
;
3586 pool
= ggc_alloc
<rtx_constant_pool
> ();
3587 pool
->const_rtx_htab
= hash_table
<const_rtx_desc_hasher
>::create_ggc (31);
3594 /* Initialize constant pool hashing for a new function. */
3597 init_varasm_status (void)
3599 crtl
->varasm
.pool
= create_constant_pool ();
3600 crtl
->varasm
.deferred_constants
= 0;
3603 /* Given a MINUS expression, simplify it if both sides
3604 include the same symbol. */
3607 simplify_subtraction (rtx x
)
3609 rtx r
= simplify_rtx (x
);
3613 /* Given a constant rtx X, make (or find) a memory constant for its value
3614 and return a MEM rtx to refer to it in memory. */
3617 force_const_mem (enum machine_mode mode
, rtx x
)
3619 struct constant_descriptor_rtx
*desc
, tmp
;
3620 struct rtx_constant_pool
*pool
;
3625 constant_descriptor_rtx
**slot
;
3627 /* If we're not allowed to drop X into the constant pool, don't. */
3628 if (targetm
.cannot_force_const_mem (mode
, x
))
3631 /* Record that this function has used a constant pool entry. */
3632 crtl
->uses_const_pool
= 1;
3634 /* Decide which pool to use. */
3635 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3636 ? shared_constant_pool
3637 : crtl
->varasm
.pool
);
3639 /* Lookup the value in the hashtable. */
3642 hash
= const_rtx_hash (x
);
3643 slot
= pool
->const_rtx_htab
->find_slot_with_hash (&tmp
, hash
, INSERT
);
3646 /* If the constant was already present, return its memory. */
3648 return copy_rtx (desc
->mem
);
3650 /* Otherwise, create a new descriptor. */
3651 desc
= ggc_alloc
<constant_descriptor_rtx
> ();
3654 /* Align the location counter as required by EXP's data type. */
3655 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3656 #ifdef CONSTANT_ALIGNMENT
3658 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3659 if (type
!= NULL_TREE
)
3660 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3664 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3665 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3668 desc
->constant
= copy_rtx (tmp
.constant
);
3669 desc
->offset
= pool
->offset
;
3672 desc
->align
= align
;
3673 desc
->labelno
= const_labelno
;
3676 pool
->offset
+= GET_MODE_SIZE (mode
);
3678 pool
->last
->next
= desc
;
3680 pool
->first
= pool
->last
= desc
;
3683 /* Create a string containing the label name, in LABEL. */
3684 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3687 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3688 the constants pool. */
3689 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3691 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3692 symbol
= create_block_symbol (ggc_strdup (label
),
3693 get_block_for_section (sect
), -1);
3696 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3698 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3699 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3700 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3702 /* Construct the MEM. */
3703 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3704 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3705 set_mem_align (def
, align
);
3707 /* If we're dropping a label to the constant pool, make sure we
3709 if (GET_CODE (x
) == LABEL_REF
)
3710 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3712 return copy_rtx (def
);
3715 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3718 get_pool_constant (const_rtx addr
)
3720 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3723 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3724 and whether it has been output or not. */
3727 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3729 struct constant_descriptor_rtx
*desc
;
3731 desc
= SYMBOL_REF_CONSTANT (addr
);
3732 *pmarked
= (desc
->mark
!= 0);
3733 return desc
->constant
;
3736 /* Similar, return the mode. */
3739 get_pool_mode (const_rtx addr
)
3741 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3744 /* Return the size of the constant pool. */
3747 get_pool_size (void)
3749 return crtl
->varasm
.pool
->offset
;
3752 /* Worker function for output_constant_pool_1. Emit assembly for X
3753 in MODE with known alignment ALIGN. */
3756 output_constant_pool_2 (enum machine_mode mode
, rtx x
, unsigned int align
)
3758 switch (GET_MODE_CLASS (mode
))
3761 case MODE_DECIMAL_FLOAT
:
3765 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3766 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3767 assemble_real (r
, mode
, align
);
3772 case MODE_PARTIAL_INT
:
3777 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3780 case MODE_VECTOR_FLOAT
:
3781 case MODE_VECTOR_INT
:
3782 case MODE_VECTOR_FRACT
:
3783 case MODE_VECTOR_UFRACT
:
3784 case MODE_VECTOR_ACCUM
:
3785 case MODE_VECTOR_UACCUM
:
3788 enum machine_mode submode
= GET_MODE_INNER (mode
);
3789 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3791 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3792 units
= CONST_VECTOR_NUNITS (x
);
3794 for (i
= 0; i
< units
; i
++)
3796 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3797 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3807 /* Worker function for output_constant_pool. Emit constant DESC,
3808 giving it ALIGN bits of alignment. */
3811 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3818 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3819 whose CODE_LABEL has been deleted. This can occur if a jump table
3820 is eliminated by optimization. If so, write a constant of zero
3821 instead. Note that this can also happen by turning the
3822 CODE_LABEL into a NOTE. */
3823 /* ??? This seems completely and utterly wrong. Certainly it's
3824 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3825 functioning even with rtx_insn::deleted and friends. */
3828 switch (GET_CODE (tmp
))
3831 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3832 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3834 tmp
= XEXP (XEXP (tmp
, 0), 0);
3838 tmp
= LABEL_REF_LABEL (tmp
);
3839 gcc_assert (!as_a
<rtx_insn
*> (tmp
)->deleted ());
3840 gcc_assert (!NOTE_P (tmp
)
3841 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3848 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3849 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3850 align
, desc
->labelno
, done
);
3853 assemble_align (align
);
3855 /* Output the label. */
3856 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3858 /* Output the data. */
3859 output_constant_pool_2 (desc
->mode
, x
, align
);
3861 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3862 sections have proper size. */
3863 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3865 && (in_section
->common
.flags
& SECTION_MERGE
))
3866 assemble_align (align
);
3868 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3874 /* Mark all constants that are referenced by SYMBOL_REFs in X.
3875 Emit referenced deferred strings. */
3878 mark_constants_in_pattern (rtx insn
)
3880 subrtx_iterator::array_type array
;
3881 FOR_EACH_SUBRTX (iter
, array
, PATTERN (insn
), ALL
)
3883 const_rtx x
= *iter
;
3884 if (GET_CODE (x
) == SYMBOL_REF
)
3886 if (CONSTANT_POOL_ADDRESS_P (x
))
3888 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3889 if (desc
->mark
== 0)
3892 iter
.substitute (desc
->constant
);
3895 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3897 tree decl
= SYMBOL_REF_DECL (x
);
3898 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
3900 n_deferred_constants
--;
3901 output_constant_def_contents (CONST_CAST_RTX (x
));
3908 /* Look through appropriate parts of INSN, marking all entries in the
3909 constant pool which are actually being used. Entries that are only
3910 referenced by other constants are also marked as used. Emit
3911 deferred strings that are used. */
3914 mark_constants (rtx_insn
*insn
)
3919 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3920 insns, not any notes that may be attached. We don't want to mark
3921 a constant just because it happens to appear in a REG_EQUIV note. */
3922 if (rtx_sequence
*seq
= dyn_cast
<rtx_sequence
*> (PATTERN (insn
)))
3924 int i
, n
= seq
->len ();
3925 for (i
= 0; i
< n
; ++i
)
3927 rtx subinsn
= seq
->element (i
);
3928 if (INSN_P (subinsn
))
3929 mark_constants_in_pattern (subinsn
);
3933 mark_constants_in_pattern (insn
);
3936 /* Look through the instructions for this function, and mark all the
3937 entries in POOL which are actually being used. Emit deferred constants
3938 which have indeed been used. */
3941 mark_constant_pool (void)
3945 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
3948 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3949 mark_constants (insn
);
3952 /* Write all the constants in POOL. */
3955 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
3957 struct constant_descriptor_rtx
*desc
;
3959 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3962 /* If the constant is part of an object_block, make sure that
3963 the constant has been positioned within its block, but do not
3964 write out its definition yet. output_object_blocks will do
3966 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
3967 && SYMBOL_REF_BLOCK (desc
->sym
))
3968 place_block_symbol (desc
->sym
);
3971 switch_to_section (targetm
.asm_out
.select_rtx_section
3972 (desc
->mode
, desc
->constant
, desc
->align
));
3973 output_constant_pool_1 (desc
, desc
->align
);
3978 /* Mark all constants that are used in the current function, then write
3979 out the function's private constant pool. */
3982 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
3983 tree fndecl ATTRIBUTE_UNUSED
)
3985 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
3987 /* It is possible for gcc to call force_const_mem and then to later
3988 discard the instructions which refer to the constant. In such a
3989 case we do not need to output the constant. */
3990 mark_constant_pool ();
3992 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3993 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3996 output_constant_pool_contents (pool
);
3998 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3999 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4003 /* Write the contents of the shared constant pool. */
4006 output_shared_constant_pool (void)
4008 output_constant_pool_contents (shared_constant_pool
);
4011 /* Determine what kind of relocations EXP may need. */
4014 compute_reloc_for_constant (tree exp
)
4016 int reloc
= 0, reloc2
;
4019 switch (TREE_CODE (exp
))
4023 /* Go inside any operations that get_inner_reference can handle and see
4024 if what's inside is a constant: no need to do anything here for
4025 addresses of variables or functions. */
4026 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4027 tem
= TREE_OPERAND (tem
, 0))
4030 if (TREE_CODE (tem
) == MEM_REF
4031 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
4033 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
4037 if (!targetm
.binds_local_p (tem
))
4044 case POINTER_PLUS_EXPR
:
4045 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4046 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4050 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4051 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4052 /* The difference of two local labels is computable at link time. */
4053 if (reloc
== 1 && reloc2
== 1)
4060 case VIEW_CONVERT_EXPR
:
4061 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4066 unsigned HOST_WIDE_INT idx
;
4067 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4069 reloc
|= compute_reloc_for_constant (tem
);
4079 /* Find all the constants whose addresses are referenced inside of EXP,
4080 and make sure assembler code with a label has been output for each one.
4081 Indicate whether an ADDR_EXPR has been encountered. */
4084 output_addressed_constants (tree exp
)
4088 switch (TREE_CODE (exp
))
4092 /* Go inside any operations that get_inner_reference can handle and see
4093 if what's inside is a constant: no need to do anything here for
4094 addresses of variables or functions. */
4095 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4096 tem
= TREE_OPERAND (tem
, 0))
4099 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4100 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4101 tem
= DECL_INITIAL (tem
);
4103 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4104 output_constant_def (tem
, 0);
4106 if (TREE_CODE (tem
) == MEM_REF
)
4107 output_addressed_constants (TREE_OPERAND (tem
, 0));
4111 case POINTER_PLUS_EXPR
:
4113 output_addressed_constants (TREE_OPERAND (exp
, 1));
4117 case VIEW_CONVERT_EXPR
:
4118 output_addressed_constants (TREE_OPERAND (exp
, 0));
4123 unsigned HOST_WIDE_INT idx
;
4124 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4126 output_addressed_constants (tem
);
4135 /* Whether a constructor CTOR is a valid static constant initializer if all
4136 its elements are. This used to be internal to initializer_constant_valid_p
4137 and has been exposed to let other functions like categorize_ctor_elements
4138 evaluate the property while walking a constructor for other purposes. */
4141 constructor_static_from_elts_p (const_tree ctor
)
4143 return (TREE_CONSTANT (ctor
)
4144 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4145 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4146 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4149 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4152 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4153 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4154 which are valid when ENDTYPE is an integer of any size; in
4155 particular, this does not accept a pointer minus a constant. This
4156 returns null_pointer_node if the VALUE is an absolute constant
4157 which can be used to initialize a static variable. Otherwise it
4161 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4165 if (!INTEGRAL_TYPE_P (endtype
))
4168 op0
= TREE_OPERAND (value
, 0);
4169 op1
= TREE_OPERAND (value
, 1);
4171 /* Like STRIP_NOPS except allow the operand mode to widen. This
4172 works around a feature of fold that simplifies (int)(p1 - p2) to
4173 ((int)p1 - (int)p2) under the theory that the narrower operation
4176 while (CONVERT_EXPR_P (op0
)
4177 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4179 tree inner
= TREE_OPERAND (op0
, 0);
4180 if (inner
== error_mark_node
4181 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4182 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4183 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4188 while (CONVERT_EXPR_P (op1
)
4189 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4191 tree inner
= TREE_OPERAND (op1
, 0);
4192 if (inner
== error_mark_node
4193 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4194 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4195 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4200 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4204 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4205 cache
? cache
+ 2 : NULL
);
4206 /* Both initializers must be known. */
4210 && (op0
== null_pointer_node
4211 || TREE_CODE (value
) == MINUS_EXPR
))
4212 return null_pointer_node
;
4214 /* Support differences between labels. */
4215 if (TREE_CODE (op0
) == LABEL_DECL
4216 && TREE_CODE (op1
) == LABEL_DECL
)
4217 return null_pointer_node
;
4219 if (TREE_CODE (op0
) == STRING_CST
4220 && TREE_CODE (op1
) == STRING_CST
4221 && operand_equal_p (op0
, op1
, 1))
4222 return null_pointer_node
;
4228 /* Helper function of initializer_constant_valid_p.
4229 Return nonzero if VALUE is a valid constant-valued expression
4230 for use in initializing a static variable; one that can be an
4231 element of a "constant" initializer.
4233 Return null_pointer_node if the value is absolute;
4234 if it is relocatable, return the variable that determines the relocation.
4235 We assume that VALUE has been folded as much as possible;
4236 therefore, we do not need to check for such things as
4237 arithmetic-combinations of integers.
4239 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4242 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4246 switch (TREE_CODE (value
))
4249 if (constructor_static_from_elts_p (value
))
4251 unsigned HOST_WIDE_INT idx
;
4253 bool absolute
= true;
4255 if (cache
&& cache
[0] == value
)
4257 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4260 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4267 cache
[1] = NULL_TREE
;
4271 if (reloc
!= null_pointer_node
)
4274 /* For a non-absolute relocation, there is no single
4275 variable that can be "the variable that determines the
4280 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4282 return absolute
? null_pointer_node
: error_mark_node
;
4285 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4293 return null_pointer_node
;
4298 tree op0
= staticp (TREE_OPERAND (value
, 0));
4301 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4302 to be a constant, this is old-skool offsetof-like nonsense. */
4303 if (TREE_CODE (op0
) == INDIRECT_REF
4304 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4305 return null_pointer_node
;
4306 /* Taking the address of a nested function involves a trampoline,
4307 unless we don't need or want one. */
4308 if (TREE_CODE (op0
) == FUNCTION_DECL
4309 && DECL_STATIC_CHAIN (op0
)
4310 && !TREE_NO_TRAMPOLINE (value
))
4312 /* "&{...}" requires a temporary to hold the constructed
4314 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4320 case NON_LVALUE_EXPR
:
4321 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4324 case VIEW_CONVERT_EXPR
:
4326 tree src
= TREE_OPERAND (value
, 0);
4327 tree src_type
= TREE_TYPE (src
);
4328 tree dest_type
= TREE_TYPE (value
);
4330 /* Allow view-conversions from aggregate to non-aggregate type only
4331 if the bit pattern is fully preserved afterwards; otherwise, the
4332 RTL expander won't be able to apply a subsequent transformation
4333 to the underlying constructor. */
4334 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4336 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4337 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4342 /* Allow all other kinds of view-conversion. */
4343 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4348 tree src
= TREE_OPERAND (value
, 0);
4349 tree src_type
= TREE_TYPE (src
);
4350 tree dest_type
= TREE_TYPE (value
);
4352 /* Allow conversions between pointer types, floating-point
4353 types, and offset types. */
4354 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4355 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4356 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4357 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4358 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4360 /* Allow length-preserving conversions between integer types. */
4361 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4362 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4363 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4365 /* Allow conversions between other integer types only if
4367 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4369 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4370 if (inner
== null_pointer_node
)
4371 return null_pointer_node
;
4375 /* Allow (int) &foo provided int is as wide as a pointer. */
4376 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4377 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4378 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4380 /* Likewise conversions from int to pointers, but also allow
4381 conversions from 0. */
4382 if ((POINTER_TYPE_P (dest_type
)
4383 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4384 && INTEGRAL_TYPE_P (src_type
))
4386 if (TREE_CODE (src
) == INTEGER_CST
4387 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4388 return null_pointer_node
;
4389 if (integer_zerop (src
))
4390 return null_pointer_node
;
4391 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4392 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4395 /* Allow conversions to struct or union types if the value
4397 if (TREE_CODE (dest_type
) == RECORD_TYPE
4398 || TREE_CODE (dest_type
) == UNION_TYPE
)
4399 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4403 case POINTER_PLUS_EXPR
:
4405 /* Any valid floating-point constants will have been folded by now;
4406 with -frounding-math we hit this with addition of two constants. */
4407 if (TREE_CODE (endtype
) == REAL_TYPE
)
4409 if (cache
&& cache
[0] == value
)
4411 if (! INTEGRAL_TYPE_P (endtype
)
4412 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4414 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4416 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4419 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4420 endtype
, ncache
+ 2);
4421 /* If either term is absolute, use the other term's relocation. */
4422 if (valid0
== null_pointer_node
)
4424 else if (valid1
== null_pointer_node
)
4426 /* Support narrowing pointer differences. */
4428 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4432 /* Support narrowing pointer differences. */
4433 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4442 if (TREE_CODE (endtype
) == REAL_TYPE
)
4444 if (cache
&& cache
[0] == value
)
4446 if (! INTEGRAL_TYPE_P (endtype
)
4447 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4449 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4451 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4454 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4455 endtype
, ncache
+ 2);
4456 /* Win if second argument is absolute. */
4457 if (valid1
== null_pointer_node
)
4459 /* Win if both arguments have the same relocation.
4460 Then the value is absolute. */
4461 else if (valid0
== valid1
&& valid0
!= 0)
4462 ret
= null_pointer_node
;
4463 /* Since GCC guarantees that string constants are unique in the
4464 generated code, a subtraction between two copies of the same
4465 constant string is absolute. */
4466 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4467 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4468 && operand_equal_p (valid0
, valid1
, 1))
4469 ret
= null_pointer_node
;
4470 /* Support narrowing differences. */
4472 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4476 /* Support narrowing differences. */
4477 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4492 /* Return nonzero if VALUE is a valid constant-valued expression
4493 for use in initializing a static variable; one that can be an
4494 element of a "constant" initializer.
4496 Return null_pointer_node if the value is absolute;
4497 if it is relocatable, return the variable that determines the relocation.
4498 We assume that VALUE has been folded as much as possible;
4499 therefore, we do not need to check for such things as
4500 arithmetic-combinations of integers. */
4502 initializer_constant_valid_p (tree value
, tree endtype
)
4504 return initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4507 /* Return true if VALUE is a valid constant-valued expression
4508 for use in initializing a static bit-field; one that can be
4509 an element of a "constant" initializer. */
4512 initializer_constant_valid_for_bitfield_p (tree value
)
4514 /* For bitfields we support integer constants or possibly nested aggregates
4516 switch (TREE_CODE (value
))
4520 unsigned HOST_WIDE_INT idx
;
4523 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4524 if (!initializer_constant_valid_for_bitfield_p (elt
))
4533 case VIEW_CONVERT_EXPR
:
4534 case NON_LVALUE_EXPR
:
4536 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4545 /* output_constructor outer state of relevance in recursive calls, typically
4546 for nested aggregate bitfields. */
4549 unsigned int bit_offset
; /* current position in ... */
4550 int byte
; /* ... the outer byte buffer. */
4553 static unsigned HOST_WIDE_INT
4554 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int,
4557 /* Output assembler code for constant EXP, with no label.
4558 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4559 Assumes output_addressed_constants has been done on EXP already.
4561 Generate at least SIZE bytes of assembler data, padding at the end
4562 with zeros if necessary. SIZE must always be specified. The returned
4563 value is the actual number of bytes of assembler data generated, which
4564 may be bigger than SIZE if the object contains a variable length field.
4566 SIZE is important for structure constructors,
4567 since trailing members may have been omitted from the constructor.
4568 It is also important for initialization of arrays from string constants
4569 since the full length of the string constant might not be wanted.
4570 It is also needed for initialization of unions, where the initializer's
4571 type is just one member, and that may not be as long as the union.
4573 There a case in which we would fail to output exactly SIZE bytes:
4574 for a structure constructor that wants to produce more than SIZE bytes.
4575 But such constructors will never be generated for any possible input.
4577 ALIGN is the alignment of the data in bits. */
4579 static unsigned HOST_WIDE_INT
4580 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4582 enum tree_code code
;
4583 unsigned HOST_WIDE_INT thissize
;
4585 if (size
== 0 || flag_syntax_only
)
4588 /* See if we're trying to initialize a pointer in a non-default mode
4589 to the address of some declaration somewhere. If the target says
4590 the mode is valid for pointers, assume the target has a way of
4592 if (TREE_CODE (exp
) == NOP_EXPR
4593 && POINTER_TYPE_P (TREE_TYPE (exp
))
4594 && targetm
.addr_space
.valid_pointer_mode
4595 (TYPE_MODE (TREE_TYPE (exp
)),
4596 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4598 tree saved_type
= TREE_TYPE (exp
);
4600 /* Peel off any intermediate conversions-to-pointer for valid
4602 while (TREE_CODE (exp
) == NOP_EXPR
4603 && POINTER_TYPE_P (TREE_TYPE (exp
))
4604 && targetm
.addr_space
.valid_pointer_mode
4605 (TYPE_MODE (TREE_TYPE (exp
)),
4606 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4607 exp
= TREE_OPERAND (exp
, 0);
4609 /* If what we're left with is the address of something, we can
4610 convert the address to the final type and output it that
4612 if (TREE_CODE (exp
) == ADDR_EXPR
)
4613 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4614 /* Likewise for constant ints. */
4615 else if (TREE_CODE (exp
) == INTEGER_CST
)
4616 exp
= wide_int_to_tree (saved_type
, exp
);
4620 /* Eliminate any conversions since we'll be outputting the underlying
4622 while (CONVERT_EXPR_P (exp
)
4623 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4624 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4626 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4627 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4629 /* Make sure eliminating the conversion is really a no-op, except with
4630 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4631 union types to allow for Ada unchecked unions. */
4632 if (type_size
> op_size
4633 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4634 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4635 /* Keep the conversion. */
4638 exp
= TREE_OPERAND (exp
, 0);
4641 code
= TREE_CODE (TREE_TYPE (exp
));
4642 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4644 /* Allow a constructor with no elements for any data type.
4645 This means to fill the space with zeros. */
4646 if (TREE_CODE (exp
) == CONSTRUCTOR
4647 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4649 assemble_zeros (size
);
4653 if (TREE_CODE (exp
) == FDESC_EXPR
)
4655 #ifdef ASM_OUTPUT_FDESC
4656 HOST_WIDE_INT part
= tree_to_shwi (TREE_OPERAND (exp
, 1));
4657 tree decl
= TREE_OPERAND (exp
, 0);
4658 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4665 /* Now output the underlying data. If we've handling the padding, return.
4666 Otherwise, break and ensure SIZE is the size written. */
4673 case REFERENCE_TYPE
:
4675 case FIXED_POINT_TYPE
:
4677 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4678 EXPAND_INITIALIZER
),
4679 MIN (size
, thissize
), align
, 0))
4680 error ("initializer for integer/fixed-point value is too complicated");
4684 if (TREE_CODE (exp
) != REAL_CST
)
4685 error ("initializer for floating value is not a floating constant");
4687 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4691 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4692 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4693 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4698 switch (TREE_CODE (exp
))
4701 return output_constructor (exp
, size
, align
, NULL
);
4704 = MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
), size
);
4705 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4709 enum machine_mode inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4710 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4711 int elt_size
= GET_MODE_SIZE (inner
);
4712 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
);
4713 thissize
= elt_size
;
4714 for (unsigned int i
= 1; i
< VECTOR_CST_NELTS (exp
); i
++)
4716 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
);
4717 thissize
+= elt_size
;
4728 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4729 return output_constructor (exp
, size
, align
, NULL
);
4738 if (size
> thissize
)
4739 assemble_zeros (size
- thissize
);
4745 /* Subroutine of output_constructor, used for computing the size of
4746 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4747 type with an unspecified upper bound. */
4749 static unsigned HOST_WIDE_INT
4750 array_size_for_constructor (tree val
)
4753 unsigned HOST_WIDE_INT cnt
;
4754 tree index
, value
, tmp
;
4757 /* This code used to attempt to handle string constants that are not
4758 arrays of single-bytes, but nothing else does, so there's no point in
4760 if (TREE_CODE (val
) == STRING_CST
)
4761 return TREE_STRING_LENGTH (val
);
4763 max_index
= NULL_TREE
;
4764 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4766 if (TREE_CODE (index
) == RANGE_EXPR
)
4767 index
= TREE_OPERAND (index
, 1);
4768 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4772 if (max_index
== NULL_TREE
)
4775 /* Compute the total number of array elements. */
4776 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4777 i
= wi::to_offset (max_index
) - wi::to_offset (tmp
) + 1;
4779 /* Multiply by the array element unit size to find number of bytes. */
4780 i
*= wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4782 gcc_assert (wi::fits_uhwi_p (i
));
4783 return i
.to_uhwi ();
4786 /* Other datastructures + helpers for output_constructor. */
4788 /* output_constructor local state to support interaction with helpers. */
4792 /* Received arguments. */
4793 tree exp
; /* Constructor expression. */
4794 tree type
; /* Type of constructor expression. */
4795 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4796 unsigned int align
; /* Known initial alignment. */
4797 tree min_index
; /* Lower bound if specified for an array. */
4799 /* Output processing state. */
4800 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4801 int byte
; /* Part of a bitfield byte yet to be output. */
4802 int last_relative_index
; /* Implicit or explicit index of the last
4803 array element output within a bitfield. */
4804 bool byte_buffer_in_use
; /* Whether BYTE is in use. */
4806 /* Current element. */
4807 tree field
; /* Current field decl in a record. */
4808 tree val
; /* Current element value. */
4809 tree index
; /* Current element index. */
4813 /* Helper for output_constructor. From the current LOCAL state, output a
4814 RANGE_EXPR element. */
4817 output_constructor_array_range (oc_local_state
*local
)
4819 unsigned HOST_WIDE_INT fieldsize
4820 = int_size_in_bytes (TREE_TYPE (local
->type
));
4822 HOST_WIDE_INT lo_index
4823 = tree_to_shwi (TREE_OPERAND (local
->index
, 0));
4824 HOST_WIDE_INT hi_index
4825 = tree_to_shwi (TREE_OPERAND (local
->index
, 1));
4826 HOST_WIDE_INT index
;
4829 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4831 for (index
= lo_index
; index
<= hi_index
; index
++)
4833 /* Output the element's initial value. */
4834 if (local
->val
== NULL_TREE
)
4835 assemble_zeros (fieldsize
);
4837 fieldsize
= output_constant (local
->val
, fieldsize
, align2
);
4839 /* Count its size. */
4840 local
->total_bytes
+= fieldsize
;
4844 /* Helper for output_constructor. From the current LOCAL state, output a
4845 field element that is not true bitfield or part of an outer one. */
4848 output_constructor_regular_field (oc_local_state
*local
)
4850 /* Field size and position. Since this structure is static, we know the
4851 positions are constant. */
4852 unsigned HOST_WIDE_INT fieldsize
;
4853 HOST_WIDE_INT fieldpos
;
4855 unsigned int align2
;
4857 if (local
->index
!= NULL_TREE
)
4859 /* Perform the index calculation in modulo arithmetic but
4860 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4861 but we are using an unsigned sizetype. */
4862 unsigned prec
= TYPE_PRECISION (sizetype
);
4863 offset_int idx
= wi::sext (wi::to_offset (local
->index
)
4864 - wi::to_offset (local
->min_index
), prec
);
4865 fieldpos
= (idx
* wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
))))
4868 else if (local
->field
!= NULL_TREE
)
4869 fieldpos
= int_byte_position (local
->field
);
4873 /* Output any buffered-up bit-fields preceding this element. */
4874 if (local
->byte_buffer_in_use
)
4876 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4877 local
->total_bytes
++;
4878 local
->byte_buffer_in_use
= false;
4881 /* Advance to offset of this element.
4882 Note no alignment needed in an array, since that is guaranteed
4883 if each element has the proper size. */
4884 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4885 && fieldpos
> local
->total_bytes
)
4887 assemble_zeros (fieldpos
- local
->total_bytes
);
4888 local
->total_bytes
= fieldpos
;
4891 /* Find the alignment of this element. */
4892 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
4894 /* Determine size this element should occupy. */
4899 /* If this is an array with an unspecified upper bound,
4900 the initializer determines the size. */
4901 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4902 but we cannot do this until the deprecated support for
4903 initializing zero-length array members is removed. */
4904 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
4905 && TYPE_DOMAIN (TREE_TYPE (local
->field
))
4906 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
))))
4908 fieldsize
= array_size_for_constructor (local
->val
);
4909 /* Given a non-empty initialization, this field had
4911 gcc_assert (!fieldsize
|| !DECL_CHAIN (local
->field
));
4914 fieldsize
= tree_to_uhwi (DECL_SIZE_UNIT (local
->field
));
4917 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
4919 /* Output the element's initial value. */
4920 if (local
->val
== NULL_TREE
)
4921 assemble_zeros (fieldsize
);
4923 fieldsize
= output_constant (local
->val
, fieldsize
, align2
);
4925 /* Count its size. */
4926 local
->total_bytes
+= fieldsize
;
4929 /* Helper for output_constructor. From the LOCAL state, output an element
4930 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
4931 from the start of a possibly ongoing outer byte buffer. */
4934 output_constructor_bitfield (oc_local_state
*local
, unsigned int bit_offset
)
4936 /* Bit size of this element. */
4937 HOST_WIDE_INT ebitsize
4939 ? tree_to_uhwi (DECL_SIZE (local
->field
))
4940 : tree_to_uhwi (TYPE_SIZE (TREE_TYPE (local
->type
))));
4942 /* Relative index of this element if this is an array component. */
4943 HOST_WIDE_INT relative_index
4946 ? (tree_to_shwi (local
->index
)
4947 - tree_to_shwi (local
->min_index
))
4948 : local
->last_relative_index
+ 1)
4951 /* Bit position of this element from the start of the containing
4953 HOST_WIDE_INT constructor_relative_ebitpos
4955 ? int_bit_position (local
->field
)
4956 : ebitsize
* relative_index
);
4958 /* Bit position of this element from the start of a possibly ongoing
4959 outer byte buffer. */
4960 HOST_WIDE_INT byte_relative_ebitpos
4961 = bit_offset
+ constructor_relative_ebitpos
;
4963 /* From the start of a possibly ongoing outer byte buffer, offsets to
4964 the first bit of this element and to the first bit past the end of
4966 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
4967 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
4969 local
->last_relative_index
= relative_index
;
4971 if (local
->val
== NULL_TREE
)
4972 local
->val
= integer_zero_node
;
4974 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
4975 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
4976 local
->val
= TREE_OPERAND (local
->val
, 0);
4978 if (TREE_CODE (local
->val
) != INTEGER_CST
4979 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
4981 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
4985 /* If this field does not start in this (or next) byte, skip some bytes. */
4986 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4988 /* Output remnant of any bit field in previous bytes. */
4989 if (local
->byte_buffer_in_use
)
4991 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4992 local
->total_bytes
++;
4993 local
->byte_buffer_in_use
= false;
4996 /* If still not at proper byte, advance to there. */
4997 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4999 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
5000 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
5001 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
5005 /* Set up the buffer if necessary. */
5006 if (!local
->byte_buffer_in_use
)
5010 local
->byte_buffer_in_use
= true;
5013 /* If this is nested constructor, recurse passing the bit offset and the
5014 pending data, then retrieve the new pending data afterwards. */
5015 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
5017 oc_outer_state temp_state
;
5018 temp_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
5019 temp_state
.byte
= local
->byte
;
5021 += output_constructor (local
->val
, 0, 0, &temp_state
);
5022 local
->byte
= temp_state
.byte
;
5026 /* Otherwise, we must split the element into pieces that fall within
5027 separate bytes, and combine each byte with previous or following
5029 while (next_offset
< end_offset
)
5033 HOST_WIDE_INT value
;
5034 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
5035 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
5037 /* Advance from byte to byte within this element when necessary. */
5038 while (next_byte
!= local
->total_bytes
)
5040 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5041 local
->total_bytes
++;
5045 /* Number of bits we can process at once (all part of the same byte). */
5046 this_time
= MIN (end_offset
- next_offset
, BITS_PER_UNIT
- next_bit
);
5047 if (BYTES_BIG_ENDIAN
)
5049 /* On big-endian machine, take the most significant bits (of the
5050 bits that are significant) first and put them into bytes from
5051 the most significant end. */
5052 shift
= end_offset
- next_offset
- this_time
;
5054 /* Don't try to take a bunch of bits that cross
5055 the word boundary in the INTEGER_CST. We can
5056 only select bits from one element. */
5057 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5058 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5060 const int end
= shift
+ this_time
- 1;
5061 shift
= end
& -HOST_BITS_PER_WIDE_INT
;
5062 this_time
= end
- shift
+ 1;
5065 /* Now get the bits from the appropriate constant word. */
5066 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5067 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5069 /* Get the result. This works only when:
5070 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5071 local
->byte
|= (((value
>> shift
)
5072 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5073 << (BITS_PER_UNIT
- this_time
- next_bit
));
5077 /* On little-endian machines, take the least significant bits of
5078 the value first and pack them starting at the least significant
5079 bits of the bytes. */
5080 shift
= next_offset
- byte_relative_ebitpos
;
5082 /* Don't try to take a bunch of bits that cross
5083 the word boundary in the INTEGER_CST. We can
5084 only select bits from one element. */
5085 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5086 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5088 = HOST_BITS_PER_WIDE_INT
- (shift
& (HOST_BITS_PER_WIDE_INT
- 1));
5090 /* Now get the bits from the appropriate constant word. */
5091 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5092 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5094 /* Get the result. This works only when:
5095 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5096 local
->byte
|= (((value
>> shift
)
5097 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5101 next_offset
+= this_time
;
5102 local
->byte_buffer_in_use
= true;
5106 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5107 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5108 caller output state of relevance in recursive invocations. */
5110 static unsigned HOST_WIDE_INT
5111 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
5112 unsigned int align
, oc_outer_state
*outer
)
5114 unsigned HOST_WIDE_INT cnt
;
5115 constructor_elt
*ce
;
5117 oc_local_state local
;
5119 /* Setup our local state to communicate with helpers. */
5121 local
.type
= TREE_TYPE (exp
);
5123 local
.align
= align
;
5124 if (TREE_CODE (local
.type
) == ARRAY_TYPE
&& TYPE_DOMAIN (local
.type
))
5125 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5127 local
.min_index
= NULL_TREE
;
5129 local
.total_bytes
= 0;
5130 local
.byte_buffer_in_use
= outer
!= NULL
;
5131 local
.byte
= outer
? outer
->byte
: 0;
5132 local
.last_relative_index
= -1;
5134 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5136 /* As CE goes through the elements of the constant, FIELD goes through the
5137 structure fields if the constant is a structure. If the constant is a
5138 union, we override this by getting the field from the TREE_LIST element.
5139 But the constant could also be an array. Then FIELD is zero.
5141 There is always a maximum of one element in the chain LINK for unions
5142 (even if the initializer in a source program incorrectly contains
5145 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5146 local
.field
= TYPE_FIELDS (local
.type
);
5148 local
.field
= NULL_TREE
;
5151 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5152 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5154 local
.val
= ce
->value
;
5155 local
.index
= NULL_TREE
;
5157 /* The element in a union constructor specifies the proper field
5159 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5160 local
.field
= ce
->index
;
5162 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5163 local
.index
= ce
->index
;
5165 if (local
.field
&& flag_verbose_asm
)
5166 fprintf (asm_out_file
, "%s %s:\n",
5168 DECL_NAME (local
.field
)
5169 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5172 /* Eliminate the marker that makes a cast not be an lvalue. */
5173 if (local
.val
!= NULL_TREE
)
5174 STRIP_NOPS (local
.val
);
5176 /* Output the current element, using the appropriate helper ... */
5178 /* For an array slice not part of an outer bitfield. */
5180 && local
.index
!= NULL_TREE
5181 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5182 output_constructor_array_range (&local
);
5184 /* For a field that is neither a true bitfield nor part of an outer one,
5185 known to be at least byte aligned and multiple-of-bytes long. */
5187 && (local
.field
== NULL_TREE
5188 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5189 output_constructor_regular_field (&local
);
5191 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5192 supported for scalar fields, so we may need to convert first. */
5195 if (TREE_CODE (local
.val
) == REAL_CST
)
5197 = fold_unary (VIEW_CONVERT_EXPR
,
5198 build_nonstandard_integer_type
5199 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5201 output_constructor_bitfield (&local
, outer
? outer
->bit_offset
: 0);
5205 /* If we are not at toplevel, save the pending data for our caller.
5206 Otherwise output the pending data and padding zeros as needed. */
5208 outer
->byte
= local
.byte
;
5211 if (local
.byte_buffer_in_use
)
5213 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5214 local
.total_bytes
++;
5217 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5219 assemble_zeros (local
.size
- local
.total_bytes
);
5220 local
.total_bytes
= local
.size
;
5224 return local
.total_bytes
;
5227 /* Mark DECL as weak. */
5230 mark_weak (tree decl
)
5232 if (DECL_WEAK (decl
))
5235 struct symtab_node
*n
= symtab_node::get (decl
);
5236 if (n
&& n
->refuse_visibility_changes
)
5237 error ("%+D declared weak after being used", decl
);
5238 DECL_WEAK (decl
) = 1;
5240 if (DECL_RTL_SET_P (decl
)
5241 && MEM_P (DECL_RTL (decl
))
5242 && XEXP (DECL_RTL (decl
), 0)
5243 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5244 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5247 /* Merge weak status between NEWDECL and OLDDECL. */
5250 merge_weak (tree newdecl
, tree olddecl
)
5252 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5254 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5257 /* We put the NEWDECL on the weak_decls list at some point
5258 and OLDDECL as well. Keep just OLDDECL on the list. */
5259 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5260 if (TREE_VALUE (*pwd
) == newdecl
)
5262 *pwd
= TREE_CHAIN (*pwd
);
5269 if (DECL_WEAK (newdecl
))
5273 /* NEWDECL is weak, but OLDDECL is not. */
5275 /* If we already output the OLDDECL, we're in trouble; we can't
5276 go back and make it weak. This should never happen in
5277 unit-at-a-time compilation. */
5278 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5280 /* If we've already generated rtl referencing OLDDECL, we may
5281 have done so in a way that will not function properly with
5282 a weak symbol. Again in unit-at-a-time this should be
5284 gcc_assert (!TREE_USED (olddecl
)
5285 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5287 if (TARGET_SUPPORTS_WEAK
)
5289 /* We put the NEWDECL on the weak_decls list at some point.
5290 Replace it with the OLDDECL. */
5291 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5292 if (TREE_VALUE (wd
) == newdecl
)
5294 TREE_VALUE (wd
) = olddecl
;
5297 /* We may not find the entry on the list. If NEWDECL is a
5298 weak alias, then we will have already called
5299 globalize_decl to remove the entry; in that case, we do
5300 not need to do anything. */
5303 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5304 mark_weak (olddecl
);
5307 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5308 weak. Just update NEWDECL to indicate that it's weak too. */
5309 mark_weak (newdecl
);
5312 /* Declare DECL to be a weak symbol. */
5315 declare_weak (tree decl
)
5317 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5318 if (! TREE_PUBLIC (decl
))
5319 error ("weak declaration of %q+D must be public", decl
);
5320 else if (!TARGET_SUPPORTS_WEAK
)
5321 warning (0, "weak declaration of %q+D not supported", decl
);
5324 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5325 DECL_ATTRIBUTES (decl
)
5326 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5330 weak_finish_1 (tree decl
)
5332 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5333 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5336 if (! TREE_USED (decl
))
5339 #ifdef ASM_WEAKEN_DECL
5340 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5342 #ifdef ASM_WEAKEN_LABEL
5343 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5345 #ifdef ASM_OUTPUT_WEAK_ALIAS
5347 static bool warn_once
= 0;
5350 warning (0, "only weak aliases are supported in this configuration");
5360 /* Fiven an assembly name, find the decl it is associated with. */
5362 find_decl (tree target
)
5364 symtab_node
*node
= symtab_node::get_for_asmname (target
);
5370 /* This TREE_LIST contains weakref targets. */
5372 static GTY(()) tree weakref_targets
;
5374 /* Emit any pending weak declarations. */
5381 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5383 tree alias_decl
= TREE_PURPOSE (t
);
5384 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5386 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5387 /* Remove alias_decl from the weak list, but leave entries for
5388 the target alone. */
5390 #ifndef ASM_OUTPUT_WEAKREF
5391 else if (! TREE_SYMBOL_REFERENCED (target
))
5393 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5394 defined, otherwise we and weak_finish_1 would use
5395 different macros. */
5396 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5397 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5399 tree decl
= find_decl (target
);
5403 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5404 TREE_CODE (alias_decl
), target
,
5405 TREE_TYPE (alias_decl
));
5407 DECL_EXTERNAL (decl
) = 1;
5408 TREE_PUBLIC (decl
) = 1;
5409 DECL_ARTIFICIAL (decl
) = 1;
5410 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5411 TREE_USED (decl
) = 1;
5414 weak_finish_1 (decl
);
5423 /* Remove the alias and the target from the pending weak list
5424 so that we do not emit any .weak directives for the former,
5425 nor multiple .weak directives for the latter. */
5426 for (p
= &weak_decls
; (t2
= *p
) ; )
5428 if (TREE_VALUE (t2
) == alias_decl
5429 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5430 *p
= TREE_CHAIN (t2
);
5432 p
= &TREE_CHAIN (t2
);
5435 /* Remove other weakrefs to the same target, to speed things up. */
5436 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5438 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5439 *p
= TREE_CHAIN (t2
);
5441 p
= &TREE_CHAIN (t2
);
5446 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5448 tree decl
= TREE_VALUE (t
);
5450 weak_finish_1 (decl
);
5454 /* Emit the assembly bits to indicate that DECL is globally visible. */
5457 globalize_decl (tree decl
)
5460 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5461 if (DECL_WEAK (decl
))
5463 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5466 #ifdef ASM_WEAKEN_DECL
5467 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5469 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5472 /* Remove this function from the pending weak list so that
5473 we do not emit multiple .weak directives for it. */
5474 for (p
= &weak_decls
; (t
= *p
) ; )
5476 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5477 *p
= TREE_CHAIN (t
);
5479 p
= &TREE_CHAIN (t
);
5482 /* Remove weakrefs to the same target from the pending weakref
5483 list, for the same reason. */
5484 for (p
= &weakref_targets
; (t
= *p
) ; )
5486 if (DECL_ASSEMBLER_NAME (decl
)
5487 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5488 *p
= TREE_CHAIN (t
);
5490 p
= &TREE_CHAIN (t
);
5497 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5500 vec
<alias_pair
, va_gc
> *alias_pairs
;
5502 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5503 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5504 tree node is DECL to have the value of the tree node TARGET. */
5507 do_assemble_alias (tree decl
, tree target
)
5509 /* Emulated TLS had better not get this var. */
5510 gcc_assert (!(!targetm
.have_tls
5511 && TREE_CODE (decl
) == VAR_DECL
5512 && DECL_THREAD_LOCAL_P (decl
)));
5514 if (TREE_ASM_WRITTEN (decl
))
5517 /* We must force creation of DECL_RTL for debug info generation, even though
5518 we don't use it here. */
5519 make_decl_rtl (decl
);
5521 TREE_ASM_WRITTEN (decl
) = 1;
5522 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5524 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5526 ultimate_transparent_alias_target (&target
);
5528 if (!TREE_SYMBOL_REFERENCED (target
))
5529 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5531 #ifdef ASM_OUTPUT_WEAKREF
5532 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5533 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5534 IDENTIFIER_POINTER (target
));
5536 if (!TARGET_SUPPORTS_WEAK
)
5538 error_at (DECL_SOURCE_LOCATION (decl
),
5539 "weakref is not supported in this configuration");
5546 #ifdef ASM_OUTPUT_DEF
5547 /* Make name accessible from other files, if appropriate. */
5549 if (TREE_PUBLIC (decl
))
5551 globalize_decl (decl
);
5552 maybe_assemble_visibility (decl
);
5554 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5556 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5557 if (targetm
.has_ifunc_p ())
5558 ASM_OUTPUT_TYPE_DIRECTIVE
5559 (asm_out_file
, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5563 error_at (DECL_SOURCE_LOCATION (decl
),
5564 "ifunc is not supported on this target");
5567 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5568 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5570 ASM_OUTPUT_DEF (asm_out_file
,
5571 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5572 IDENTIFIER_POINTER (target
));
5574 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5579 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5580 # ifdef ASM_WEAKEN_DECL
5581 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5583 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5585 /* Remove this function from the pending weak list so that
5586 we do not emit multiple .weak directives for it. */
5587 for (p
= &weak_decls
; (t
= *p
) ; )
5588 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5589 *p
= TREE_CHAIN (t
);
5591 p
= &TREE_CHAIN (t
);
5593 /* Remove weakrefs to the same target from the pending weakref
5594 list, for the same reason. */
5595 for (p
= &weakref_targets
; (t
= *p
) ; )
5597 if (DECL_ASSEMBLER_NAME (decl
)
5598 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5599 *p
= TREE_CHAIN (t
);
5601 p
= &TREE_CHAIN (t
);
5607 /* Emit an assembler directive to make the symbol for DECL an alias to
5608 the symbol for TARGET. */
5611 assemble_alias (tree decl
, tree target
)
5615 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5617 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5619 ultimate_transparent_alias_target (&target
);
5621 if (alias
== target
)
5622 error ("weakref %q+D ultimately targets itself", decl
);
5623 if (TREE_PUBLIC (decl
))
5624 error ("weakref %q+D must have static linkage", decl
);
5628 #if !defined (ASM_OUTPUT_DEF)
5629 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5630 error_at (DECL_SOURCE_LOCATION (decl
),
5631 "alias definitions not supported in this configuration");
5632 TREE_ASM_WRITTEN (decl
) = 1;
5635 if (!DECL_WEAK (decl
))
5637 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5638 error_at (DECL_SOURCE_LOCATION (decl
),
5639 "ifunc is not supported in this configuration");
5641 error_at (DECL_SOURCE_LOCATION (decl
),
5642 "only weak aliases are supported in this configuration");
5643 TREE_ASM_WRITTEN (decl
) = 1;
5649 TREE_USED (decl
) = 1;
5651 /* Allow aliases to aliases. */
5652 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5653 cgraph_node::get_create (decl
)->alias
= true;
5655 varpool_node::get_create (decl
)->alias
= true;
5657 /* If the target has already been emitted, we don't have to queue the
5658 alias. This saves a tad of memory. */
5659 if (symtab
->global_info_ready
)
5660 target_decl
= find_decl (target
);
5663 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5664 || symtab
->state
>= EXPANSION
)
5665 do_assemble_alias (decl
, target
);
5668 alias_pair p
= {decl
, target
};
5669 vec_safe_push (alias_pairs
, p
);
5673 /* Record and output a table of translations from original function
5674 to its transaction aware clone. Note that tm_pure functions are
5675 considered to be their own clone. */
5677 static GTY((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
5678 htab_t tm_clone_hash
;
5681 record_tm_clone_pair (tree o
, tree n
)
5683 struct tree_map
**slot
, *h
;
5685 if (tm_clone_hash
== NULL
)
5686 tm_clone_hash
= htab_create_ggc (32, tree_map_hash
, tree_map_eq
, 0);
5688 h
= ggc_alloc
<tree_map
> ();
5689 h
->hash
= htab_hash_pointer (o
);
5693 slot
= (struct tree_map
**)
5694 htab_find_slot_with_hash (tm_clone_hash
, h
, h
->hash
, INSERT
);
5699 get_tm_clone_pair (tree o
)
5703 struct tree_map
*h
, in
;
5706 in
.hash
= htab_hash_pointer (o
);
5707 h
= (struct tree_map
*) htab_find_with_hash (tm_clone_hash
,
5715 typedef struct tm_alias_pair
5723 /* Helper function for finish_tm_clone_pairs. Dump a hash table entry
5724 into a VEC in INFO. */
5727 dump_tm_clone_to_vec (void **slot
, void *info
)
5729 struct tree_map
*map
= (struct tree_map
*) *slot
;
5730 vec
<tm_alias_pair
> *tm_alias_pairs
= (vec
<tm_alias_pair
> *) info
;
5731 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5732 tm_alias_pairs
->safe_push (p
);
5736 /* Dump the actual pairs to the .tm_clone_table section. */
5739 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5743 bool switched
= false;
5745 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5749 struct cgraph_node
*src_n
= cgraph_node::get (src
);
5750 struct cgraph_node
*dst_n
= cgraph_node::get (dst
);
5752 /* The function ipa_tm_create_version() marks the clone as needed if
5753 the original function was needed. But we also mark the clone as
5754 needed if we ever called the clone indirectly through
5755 TM_GETTMCLONE. If neither of these are true, we didn't generate
5756 a clone, and we didn't call it indirectly... no sense keeping it
5757 in the clone table. */
5758 if (!dst_n
|| !dst_n
->definition
)
5761 /* This covers the case where we have optimized the original
5762 function away, and only access the transactional clone. */
5763 if (!src_n
|| !src_n
->definition
)
5768 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5769 assemble_align (POINTER_SIZE
);
5773 assemble_integer (XEXP (DECL_RTL (src
), 0),
5774 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
5775 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5776 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
5780 /* Provide a default for the tm_clone_table section. */
5783 default_clone_table_section (void)
5785 return get_named_section (NULL
, ".tm_clone_table", 3);
5788 /* Helper comparison function for qsorting by the DECL_UID stored in
5789 alias_pair->emitted_diags. */
5792 tm_alias_pair_cmp (const void *x
, const void *y
)
5794 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5795 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5796 if (p1
->uid
< p2
->uid
)
5798 if (p1
->uid
> p2
->uid
)
5804 finish_tm_clone_pairs (void)
5806 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5808 if (tm_clone_hash
== NULL
)
5811 /* We need a determenistic order for the .tm_clone_table, otherwise
5812 we will get bootstrap comparison failures, so dump the hash table
5813 to a vector, sort it, and dump the vector. */
5815 /* Dump the hashtable to a vector. */
5816 htab_traverse_noresize (tm_clone_hash
, dump_tm_clone_to_vec
,
5817 (void *) &tm_alias_pairs
);
5819 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5822 dump_tm_clone_pairs (tm_alias_pairs
);
5824 htab_delete (tm_clone_hash
);
5825 tm_clone_hash
= NULL
;
5826 tm_alias_pairs
.release ();
5830 /* Emit an assembler directive to set symbol for DECL visibility to
5831 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5834 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5835 int vis ATTRIBUTE_UNUSED
)
5837 #ifdef HAVE_GAS_HIDDEN
5838 static const char * const visibility_types
[] = {
5839 NULL
, "protected", "hidden", "internal"
5842 const char *name
, *type
;
5844 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5845 type
= visibility_types
[vis
];
5847 fprintf (asm_out_file
, "\t.%s\t", type
);
5848 assemble_name (asm_out_file
, name
);
5849 fprintf (asm_out_file
, "\n");
5851 if (!DECL_ARTIFICIAL (decl
))
5852 warning (OPT_Wattributes
, "visibility attribute not supported "
5853 "in this configuration; ignored");
5857 /* A helper function to call assemble_visibility when needed for a decl. */
5860 maybe_assemble_visibility (tree decl
)
5862 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5864 if (vis
!= VISIBILITY_DEFAULT
)
5866 targetm
.asm_out
.assemble_visibility (decl
, vis
);
5873 /* Returns 1 if the target configuration supports defining public symbols
5874 so that one of them will be chosen at link time instead of generating a
5875 multiply-defined symbol error, whether through the use of weak symbols or
5876 a target-specific mechanism for having duplicates discarded. */
5879 supports_one_only (void)
5881 if (SUPPORTS_ONE_ONLY
)
5883 return TARGET_SUPPORTS_WEAK
;
5886 /* Set up DECL as a public symbol that can be defined in multiple
5887 translation units without generating a linker error. */
5890 make_decl_one_only (tree decl
, tree comdat_group
)
5892 struct symtab_node
*symbol
;
5893 gcc_assert (TREE_CODE (decl
) == VAR_DECL
5894 || TREE_CODE (decl
) == FUNCTION_DECL
);
5896 TREE_PUBLIC (decl
) = 1;
5898 if (TREE_CODE (decl
) == VAR_DECL
)
5899 symbol
= varpool_node::get_create (decl
);
5901 symbol
= cgraph_node::get_create (decl
);
5903 if (SUPPORTS_ONE_ONLY
)
5905 #ifdef MAKE_DECL_ONE_ONLY
5906 MAKE_DECL_ONE_ONLY (decl
);
5908 symbol
->set_comdat_group (comdat_group
);
5910 else if (TREE_CODE (decl
) == VAR_DECL
5911 && (DECL_INITIAL (decl
) == 0
5912 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
5913 DECL_COMMON (decl
) = 1;
5916 gcc_assert (TARGET_SUPPORTS_WEAK
);
5917 DECL_WEAK (decl
) = 1;
5922 init_varasm_once (void)
5924 section_htab
= hash_table
<section_hasher
>::create_ggc (31);
5925 object_block_htab
= hash_table
<object_block_hasher
>::create_ggc (31);
5926 const_desc_htab
= hash_table
<tree_descriptor_hasher
>::create_ggc (1009);
5928 shared_constant_pool
= create_constant_pool ();
5930 #ifdef TEXT_SECTION_ASM_OP
5931 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
5932 TEXT_SECTION_ASM_OP
);
5935 #ifdef DATA_SECTION_ASM_OP
5936 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5937 DATA_SECTION_ASM_OP
);
5940 #ifdef SDATA_SECTION_ASM_OP
5941 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5942 SDATA_SECTION_ASM_OP
);
5945 #ifdef READONLY_DATA_SECTION_ASM_OP
5946 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
5947 READONLY_DATA_SECTION_ASM_OP
);
5950 #ifdef CTORS_SECTION_ASM_OP
5951 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
5952 CTORS_SECTION_ASM_OP
);
5955 #ifdef DTORS_SECTION_ASM_OP
5956 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
5957 DTORS_SECTION_ASM_OP
);
5960 #ifdef BSS_SECTION_ASM_OP
5961 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5962 output_section_asm_op
,
5963 BSS_SECTION_ASM_OP
);
5966 #ifdef SBSS_SECTION_ASM_OP
5967 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5968 output_section_asm_op
,
5969 SBSS_SECTION_ASM_OP
);
5972 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5973 | SECTION_COMMON
, emit_tls_common
);
5974 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5975 | SECTION_COMMON
, emit_local
);
5976 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5977 | SECTION_COMMON
, emit_common
);
5979 #if defined ASM_OUTPUT_ALIGNED_BSS
5980 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
5984 targetm
.asm_out
.init_sections ();
5986 if (readonly_data_section
== NULL
)
5987 readonly_data_section
= text_section
;
5989 #ifdef ASM_OUTPUT_EXTERNAL
5990 pending_assemble_externals_set
= new hash_set
<tree
>;
5995 decl_default_tls_model (const_tree decl
)
5997 enum tls_model kind
;
6000 is_local
= targetm
.binds_local_p (decl
);
6004 kind
= TLS_MODEL_LOCAL_EXEC
;
6006 kind
= TLS_MODEL_INITIAL_EXEC
;
6009 /* Local dynamic is inefficient when we're not combining the
6010 parts of the address. */
6011 else if (optimize
&& is_local
)
6012 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
6014 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
6015 if (kind
< flag_tls_default
)
6016 kind
= flag_tls_default
;
6021 /* Select a set of attributes for section NAME based on the properties
6022 of DECL and whether or not RELOC indicates that DECL's initializer
6023 might contain runtime relocations.
6025 We make the section read-only and executable for a function decl,
6026 read-only for a const data decl, and writable for a non-const data decl. */
6029 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6033 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6034 flags
= SECTION_CODE
;
6037 enum section_category category
6038 = categorize_decl_for_section (decl
, reloc
);
6039 if (decl_readonly_section_1 (category
))
6041 else if (category
== SECCAT_DATA_REL_RO
6042 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6043 flags
= SECTION_WRITE
| SECTION_RELRO
;
6045 flags
= SECTION_WRITE
;
6049 flags
= SECTION_WRITE
;
6050 if (strcmp (name
, ".data.rel.ro") == 0
6051 || strcmp (name
, ".data.rel.ro.local") == 0)
6052 flags
|= SECTION_RELRO
;
6055 if (decl
&& DECL_P (decl
) && DECL_COMDAT_GROUP (decl
))
6056 flags
|= SECTION_LINKONCE
;
6058 if (strcmp (name
, ".vtable_map_vars") == 0)
6059 flags
|= SECTION_LINKONCE
;
6061 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6062 flags
|= SECTION_TLS
| SECTION_WRITE
;
6064 if (strcmp (name
, ".bss") == 0
6065 || strncmp (name
, ".bss.", 5) == 0
6066 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6067 || strcmp (name
, ".persistent.bss") == 0
6068 || strcmp (name
, ".sbss") == 0
6069 || strncmp (name
, ".sbss.", 6) == 0
6070 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6071 flags
|= SECTION_BSS
;
6073 if (strcmp (name
, ".tdata") == 0
6074 || strncmp (name
, ".tdata.", 7) == 0
6075 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6076 flags
|= SECTION_TLS
;
6078 if (strcmp (name
, ".tbss") == 0
6079 || strncmp (name
, ".tbss.", 6) == 0
6080 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6081 flags
|= SECTION_TLS
| SECTION_BSS
;
6083 /* These three sections have special ELF types. They are neither
6084 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6085 want to print a section type (@progbits or @nobits). If someone
6086 is silly enough to emit code or TLS variables to one of these
6087 sections, then don't handle them specially. */
6088 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6089 && (strcmp (name
, ".init_array") == 0
6090 || strcmp (name
, ".fini_array") == 0
6091 || strcmp (name
, ".preinit_array") == 0))
6092 flags
|= SECTION_NOTYPE
;
6097 /* Return true if the target supports some form of global BSS,
6098 either through bss_noswitch_section, or by selecting a BSS
6099 section in TARGET_ASM_SELECT_SECTION. */
6102 have_global_bss_p (void)
6104 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6107 /* Output assembly to switch to section NAME with attribute FLAGS.
6108 Four variants for common object file formats. */
6111 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6112 unsigned int flags ATTRIBUTE_UNUSED
,
6113 tree decl ATTRIBUTE_UNUSED
)
6115 /* Some object formats don't support named sections at all. The
6116 front-end should already have flagged this as an error. */
6120 #ifndef TLS_SECTION_ASM_FLAG
6121 #define TLS_SECTION_ASM_FLAG 'T'
6125 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6126 tree decl ATTRIBUTE_UNUSED
)
6128 char flagchars
[10], *f
= flagchars
;
6130 /* If we have already declared this section, we can use an
6131 abbreviated form to switch back to it -- unless this section is
6132 part of a COMDAT groups, in which case GAS requires the full
6133 declaration every time. */
6134 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6135 && (flags
& SECTION_DECLARED
))
6137 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6141 if (!(flags
& SECTION_DEBUG
))
6143 #if defined (HAVE_GAS_SECTION_EXCLUDE) && HAVE_GAS_SECTION_EXCLUDE == 1
6144 if (flags
& SECTION_EXCLUDE
)
6147 if (flags
& SECTION_WRITE
)
6149 if (flags
& SECTION_CODE
)
6151 if (flags
& SECTION_SMALL
)
6153 if (flags
& SECTION_MERGE
)
6155 if (flags
& SECTION_STRINGS
)
6157 if (flags
& SECTION_TLS
)
6158 *f
++ = TLS_SECTION_ASM_FLAG
;
6159 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6163 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6165 if (!(flags
& SECTION_NOTYPE
))
6170 if (flags
& SECTION_BSS
)
6176 /* On platforms that use "@" as the assembly comment character,
6178 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6180 fprintf (asm_out_file
, format
, type
);
6182 if (flags
& SECTION_ENTSIZE
)
6183 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6184 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6186 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6187 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6189 fprintf (asm_out_file
, ",%s,comdat",
6190 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6194 putc ('\n', asm_out_file
);
6198 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6199 tree decl ATTRIBUTE_UNUSED
)
6201 char flagchars
[8], *f
= flagchars
;
6203 if (flags
& SECTION_WRITE
)
6205 if (flags
& SECTION_CODE
)
6209 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6213 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6216 default_coff_asm_named_section (name
, flags
, decl
);
6218 if (flags
& SECTION_LINKONCE
)
6220 /* Functions may have been compiled at various levels of
6221 optimization so we can't use `same_size' here.
6222 Instead, have the linker pick one. */
6223 fprintf (asm_out_file
, "\t.linkonce %s\n",
6224 (flags
& SECTION_CODE
? "discard" : "same_size"));
6228 /* The lame default section selector. */
6231 default_select_section (tree decl
, int reloc
,
6232 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6236 if (decl_readonly_section (decl
, reloc
))
6237 return readonly_data_section
;
6239 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6241 if (! ((flag_pic
&& reloc
)
6242 || !TREE_READONLY (decl
)
6243 || TREE_SIDE_EFFECTS (decl
)
6244 || !TREE_CONSTANT (decl
)))
6245 return readonly_data_section
;
6247 else if (TREE_CODE (decl
) == STRING_CST
)
6248 return readonly_data_section
;
6249 else if (! (flag_pic
&& reloc
))
6250 return readonly_data_section
;
6252 return data_section
;
6255 enum section_category
6256 categorize_decl_for_section (const_tree decl
, int reloc
)
6258 enum section_category ret
;
6260 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6262 else if (TREE_CODE (decl
) == STRING_CST
)
6264 if ((flag_sanitize
& SANITIZE_ADDRESS
)
6265 && asan_protect_global (CONST_CAST_TREE (decl
)))
6266 /* or !flag_merge_constants */
6267 return SECCAT_RODATA
;
6269 return SECCAT_RODATA_MERGE_STR
;
6271 else if (TREE_CODE (decl
) == VAR_DECL
)
6273 if (bss_initializer_p (decl
))
6275 else if (! TREE_READONLY (decl
)
6276 || TREE_SIDE_EFFECTS (decl
)
6277 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6279 /* Here the reloc_rw_mask is not testing whether the section should
6280 be read-only or not, but whether the dynamic link will have to
6281 do something. If so, we wish to segregate the data in order to
6282 minimize cache misses inside the dynamic linker. */
6283 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6284 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6288 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6289 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6290 else if (reloc
|| flag_merge_constants
< 2
6291 || ((flag_sanitize
& SANITIZE_ADDRESS
)
6292 && asan_protect_global (CONST_CAST_TREE (decl
))))
6293 /* C and C++ don't allow different variables to share the same
6294 location. -fmerge-all-constants allows even that (at the
6295 expense of not conforming). */
6296 ret
= SECCAT_RODATA
;
6297 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6298 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6300 ret
= SECCAT_RODATA_MERGE_CONST
;
6302 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6304 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6305 || TREE_SIDE_EFFECTS (decl
)
6306 || ! TREE_CONSTANT (decl
))
6309 ret
= SECCAT_RODATA
;
6312 ret
= SECCAT_RODATA
;
6314 /* There are no read-only thread-local sections. */
6315 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6317 /* Note that this would be *just* SECCAT_BSS, except that there's
6318 no concept of a read-only thread-local-data section. */
6319 if (ret
== SECCAT_BSS
6320 || (flag_zero_initialized_in_bss
6321 && initializer_zerop (DECL_INITIAL (decl
))))
6327 /* If the target uses small data sections, select it. */
6328 else if (targetm
.in_small_data_p (decl
))
6330 if (ret
== SECCAT_BSS
)
6332 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6333 ret
= SECCAT_SRODATA
;
6342 decl_readonly_section_1 (enum section_category category
)
6347 case SECCAT_RODATA_MERGE_STR
:
6348 case SECCAT_RODATA_MERGE_STR_INIT
:
6349 case SECCAT_RODATA_MERGE_CONST
:
6350 case SECCAT_SRODATA
:
6358 decl_readonly_section (const_tree decl
, int reloc
)
6360 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6363 /* Select a section based on the above categorization. */
6366 default_elf_select_section (tree decl
, int reloc
,
6367 unsigned HOST_WIDE_INT align
)
6370 switch (categorize_decl_for_section (decl
, reloc
))
6373 /* We're not supposed to be called on FUNCTION_DECLs. */
6376 return readonly_data_section
;
6377 case SECCAT_RODATA_MERGE_STR
:
6378 return mergeable_string_section (decl
, align
, 0);
6379 case SECCAT_RODATA_MERGE_STR_INIT
:
6380 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6381 case SECCAT_RODATA_MERGE_CONST
:
6382 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6383 case SECCAT_SRODATA
:
6387 return data_section
;
6388 case SECCAT_DATA_REL
:
6389 sname
= ".data.rel";
6391 case SECCAT_DATA_REL_LOCAL
:
6392 sname
= ".data.rel.local";
6394 case SECCAT_DATA_REL_RO
:
6395 sname
= ".data.rel.ro";
6397 case SECCAT_DATA_REL_RO_LOCAL
:
6398 sname
= ".data.rel.ro.local";
6421 return get_named_section (decl
, sname
, reloc
);
6424 /* Construct a unique section name based on the decl name and the
6425 categorization performed above. */
6428 default_unique_section (tree decl
, int reloc
)
6430 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6431 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6432 const char *prefix
, *name
, *linkonce
;
6435 switch (categorize_decl_for_section (decl
, reloc
))
6438 prefix
= one_only
? ".t" : ".text";
6441 case SECCAT_RODATA_MERGE_STR
:
6442 case SECCAT_RODATA_MERGE_STR_INIT
:
6443 case SECCAT_RODATA_MERGE_CONST
:
6444 prefix
= one_only
? ".r" : ".rodata";
6446 case SECCAT_SRODATA
:
6447 prefix
= one_only
? ".s2" : ".sdata2";
6450 prefix
= one_only
? ".d" : ".data";
6452 case SECCAT_DATA_REL
:
6453 prefix
= one_only
? ".d.rel" : ".data.rel";
6455 case SECCAT_DATA_REL_LOCAL
:
6456 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6458 case SECCAT_DATA_REL_RO
:
6459 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6461 case SECCAT_DATA_REL_RO_LOCAL
:
6462 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6465 prefix
= one_only
? ".s" : ".sdata";
6468 prefix
= one_only
? ".b" : ".bss";
6471 prefix
= one_only
? ".sb" : ".sbss";
6474 prefix
= one_only
? ".td" : ".tdata";
6477 prefix
= one_only
? ".tb" : ".tbss";
6483 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
6484 name
= targetm
.strip_name_encoding (name
);
6486 /* If we're using one_only, then there needs to be a .gnu.linkonce
6487 prefix to the section name. */
6488 linkonce
= one_only
? ".gnu.linkonce" : "";
6490 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6492 set_decl_section_name (decl
, string
);
6495 /* Subroutine of compute_reloc_for_rtx for leaf rtxes. */
6498 compute_reloc_for_rtx_1 (const_rtx x
)
6500 switch (GET_CODE (x
))
6503 return SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6511 /* Like compute_reloc_for_constant, except for an RTX. The return value
6512 is a mask for which bit 1 indicates a global relocation, and bit 0
6513 indicates a local relocation. */
6516 compute_reloc_for_rtx (const_rtx x
)
6518 switch (GET_CODE (x
))
6522 return compute_reloc_for_rtx_1 (x
);
6527 subrtx_iterator::array_type array
;
6528 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
6529 reloc
|= compute_reloc_for_rtx_1 (*iter
);
6539 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
6541 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6543 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6544 return data_section
;
6546 return readonly_data_section
;
6550 default_elf_select_rtx_section (enum machine_mode mode
, rtx x
,
6551 unsigned HOST_WIDE_INT align
)
6553 int reloc
= compute_reloc_for_rtx (x
);
6555 /* ??? Handle small data here somehow. */
6557 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6560 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6562 return get_named_section (NULL
, ".data.rel.ro", 3);
6565 return mergeable_constant_section (mode
, align
, 0);
6568 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6571 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6576 /* Careful not to prod global register variables. */
6579 symbol
= XEXP (rtl
, 0);
6580 if (GET_CODE (symbol
) != SYMBOL_REF
)
6583 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6584 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6585 flags
|= SYMBOL_FLAG_FUNCTION
;
6586 if (targetm
.binds_local_p (decl
))
6587 flags
|= SYMBOL_FLAG_LOCAL
;
6588 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6589 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6590 else if (targetm
.in_small_data_p (decl
))
6591 flags
|= SYMBOL_FLAG_SMALL
;
6592 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6593 being PUBLIC, the thing *must* be defined in this translation unit.
6594 Prevent this buglet from being propagated into rtl code as well. */
6595 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6596 flags
|= SYMBOL_FLAG_EXTERNAL
;
6598 SYMBOL_REF_FLAGS (symbol
) = flags
;
6601 /* By default, we do nothing for encode_section_info, so we need not
6602 do anything but discard the '*' marker. */
6605 default_strip_name_encoding (const char *str
)
6607 return str
+ (*str
== '*');
6610 #ifdef ASM_OUTPUT_DEF
6611 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6612 anchor relative to ".", the current section position. */
6615 default_asm_output_anchor (rtx symbol
)
6619 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6620 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6621 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6625 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6628 default_use_anchors_for_symbol_p (const_rtx symbol
)
6633 /* Don't use anchors for mergeable sections. The linker might move
6634 the objects around. */
6635 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6636 if (sect
->common
.flags
& SECTION_MERGE
)
6639 /* Don't use anchors for small data sections. The small data register
6640 acts as an anchor for such sections. */
6641 if (sect
->common
.flags
& SECTION_SMALL
)
6644 decl
= SYMBOL_REF_DECL (symbol
);
6645 if (decl
&& DECL_P (decl
))
6647 /* Don't use section anchors for decls that might be defined or
6648 usurped by other modules. */
6649 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
6652 /* Don't use section anchors for decls that will be placed in a
6653 small data section. */
6654 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6655 one above. The problem is that we only use SECTION_SMALL for
6656 sections that should be marked as small in the section directive. */
6657 if (targetm
.in_small_data_p (decl
))
6663 /* Return true when RESOLUTION indicate that symbol will be bound to the
6664 definition provided by current .o file. */
6667 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6669 return (resolution
== LDPR_PREVAILING_DEF
6670 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6671 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6674 /* Return true when RESOLUTION indicate that symbol will be bound locally
6675 within current executable or DSO. */
6678 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6680 return (resolution
== LDPR_PREVAILING_DEF
6681 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6682 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6683 || resolution
== LDPR_PREEMPTED_REG
6684 || resolution
== LDPR_PREEMPTED_IR
6685 || resolution
== LDPR_RESOLVED_IR
6686 || resolution
== LDPR_RESOLVED_EXEC
);
6689 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6690 wrt cross-module name binding. */
6693 default_binds_local_p (const_tree exp
)
6695 return default_binds_local_p_1 (exp
, flag_shlib
);
6699 default_binds_local_p_1 (const_tree exp
, int shlib
)
6702 bool resolved_locally
= false;
6703 bool resolved_to_local_def
= false;
6705 /* With resolution file in hands, take look into resolutions.
6706 We can't just return true for resolved_locally symbols,
6707 because dynamic linking might overwrite symbols
6708 in shared libraries. */
6709 if (TREE_CODE (exp
) == VAR_DECL
&& TREE_PUBLIC (exp
)
6710 && (TREE_STATIC (exp
) || DECL_EXTERNAL (exp
)))
6712 varpool_node
*vnode
= varpool_node::get (exp
);
6713 if (vnode
&& (resolution_local_p (vnode
->resolution
) || vnode
->in_other_partition
))
6714 resolved_locally
= true;
6716 && resolution_to_local_definition_p (vnode
->resolution
))
6717 resolved_to_local_def
= true;
6719 else if (TREE_CODE (exp
) == FUNCTION_DECL
&& TREE_PUBLIC (exp
))
6721 struct cgraph_node
*node
= cgraph_node::get (exp
);
6723 && (resolution_local_p (node
->resolution
) || node
->in_other_partition
))
6724 resolved_locally
= true;
6726 && resolution_to_local_definition_p (node
->resolution
))
6727 resolved_to_local_def
= true;
6730 /* A non-decl is an entry in the constant pool. */
6733 /* Weakrefs may not bind locally, even though the weakref itself is always
6734 static and therefore local. Similarly, the resolver for ifunc functions
6735 might resolve to a non-local function.
6736 FIXME: We can resolve the weakref case more curefuly by looking at the
6738 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6739 || (TREE_CODE (exp
) == FUNCTION_DECL
6740 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6742 /* Static variables are always local. */
6743 else if (! TREE_PUBLIC (exp
))
6745 /* A variable is local if the user has said explicitly that it will
6747 else if ((DECL_VISIBILITY_SPECIFIED (exp
)
6748 || resolved_to_local_def
)
6749 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6751 /* Variables defined outside this object might not be local. */
6752 else if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6754 /* If defined in this object and visibility is not default, must be
6756 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6758 /* Default visibility weak data can be overridden by a strong symbol
6759 in another module and so are not local. */
6760 else if (DECL_WEAK (exp
)
6761 && !resolved_locally
)
6763 /* If PIC, then assume that any global name can be overridden by
6764 symbols resolved from other modules. */
6767 /* Uninitialized COMMON variable may be unified with symbols
6768 resolved from other modules. */
6769 else if (DECL_COMMON (exp
)
6770 && !resolved_locally
6771 && (DECL_INITIAL (exp
) == NULL
6772 || (!in_lto_p
&& DECL_INITIAL (exp
) == error_mark_node
)))
6774 /* Otherwise we're left with initialized (or non-common) global data
6775 which is of necessity defined locally. */
6782 /* Return true when references to DECL must bind to current definition in
6785 The condition is usually equivalent to whether the function binds to the
6786 current module (shared library or executable), that is to binds_local_p.
6787 We use this fact to avoid need for another target hook and implement
6788 the logic using binds_local_p and just special cases where
6789 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6790 the weak definitions (that can be overwritten at linktime by other
6791 definition from different object file) and when resolution info is available
6792 we simply use the knowledge passed to us by linker plugin. */
6794 decl_binds_to_current_def_p (const_tree decl
)
6796 gcc_assert (DECL_P (decl
));
6797 if (!targetm
.binds_local_p (decl
))
6799 if (!TREE_PUBLIC (decl
))
6801 /* When resolution is available, just use it. */
6802 if (TREE_CODE (decl
) == VAR_DECL
6803 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)))
6805 varpool_node
*vnode
= varpool_node::get (decl
);
6807 && vnode
->resolution
!= LDPR_UNKNOWN
)
6808 return resolution_to_local_definition_p (vnode
->resolution
);
6810 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
6812 struct cgraph_node
*node
= cgraph_node::get (decl
);
6814 && node
->resolution
!= LDPR_UNKNOWN
)
6815 return resolution_to_local_definition_p (node
->resolution
);
6817 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6818 binds locally but still can be overwritten), DECL_COMMON (can be merged
6819 with a non-common definition somewhere in the same module) or
6821 This rely on fact that binds_local_p behave as decl_replaceable_p
6822 for all other declaration types. */
6823 if (DECL_WEAK (decl
))
6825 if (DECL_COMMON (decl
)
6826 && (DECL_INITIAL (decl
) == NULL
6827 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6829 if (DECL_EXTERNAL (decl
))
6834 /* A replaceable function or variable is one which may be replaced
6835 at link-time with an entirely different definition, provided that the
6836 replacement has the same type. For example, functions declared
6837 with __attribute__((weak)) on most systems are replaceable.
6839 COMDAT functions are not replaceable, since all definitions of the
6840 function must be equivalent. It is important that COMDAT functions
6841 not be treated as replaceable so that use of C++ template
6842 instantiations is not penalized. */
6845 decl_replaceable_p (tree decl
)
6847 gcc_assert (DECL_P (decl
));
6848 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
6850 if (!flag_semantic_interposition
6851 && !DECL_WEAK (decl
))
6853 return !decl_binds_to_current_def_p (decl
);
6856 /* Default function to output code that will globalize a label. A
6857 target must define GLOBAL_ASM_OP or provide its own function to
6858 globalize a label. */
6859 #ifdef GLOBAL_ASM_OP
6861 default_globalize_label (FILE * stream
, const char *name
)
6863 fputs (GLOBAL_ASM_OP
, stream
);
6864 assemble_name (stream
, name
);
6865 putc ('\n', stream
);
6867 #endif /* GLOBAL_ASM_OP */
6869 /* Default function to output code that will globalize a declaration. */
6871 default_globalize_decl_name (FILE * stream
, tree decl
)
6873 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6874 targetm
.asm_out
.globalize_label (stream
, name
);
6877 /* Default function to output a label for unwind information. The
6878 default is to do nothing. A target that needs nonlocal labels for
6879 unwind information must provide its own function to do this. */
6881 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6882 tree decl ATTRIBUTE_UNUSED
,
6883 int for_eh ATTRIBUTE_UNUSED
,
6884 int empty ATTRIBUTE_UNUSED
)
6888 /* Default function to output a label to divide up the exception table.
6889 The default is to do nothing. A target that needs/wants to divide
6890 up the table must provide it's own function to do this. */
6892 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
6896 /* This is how to output an internal numbered label where PREFIX is
6897 the class of label and LABELNO is the number within the class. */
6900 default_generate_internal_label (char *buf
, const char *prefix
,
6901 unsigned long labelno
)
6903 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6906 /* This is how to output an internal numbered label where PREFIX is
6907 the class of label and LABELNO is the number within the class. */
6910 default_internal_label (FILE *stream
, const char *prefix
,
6911 unsigned long labelno
)
6913 char *const buf
= (char *) alloca (40 + strlen (prefix
));
6914 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6915 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
6919 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
6922 default_asm_declare_constant_name (FILE *file
, const char *name
,
6923 const_tree exp ATTRIBUTE_UNUSED
,
6924 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
6926 assemble_label (file
, name
);
6929 /* This is the default behavior at the beginning of a file. It's
6930 controlled by two other target-hook toggles. */
6932 default_file_start (void)
6934 if (targetm
.asm_file_start_app_off
6935 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
6936 fputs (ASM_APP_OFF
, asm_out_file
);
6938 if (targetm
.asm_file_start_file_directive
)
6939 output_file_directive (asm_out_file
, main_input_filename
);
6942 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6943 which emits a special section directive used to indicate whether or
6944 not this object file needs an executable stack. This is primarily
6945 a GNU extension to ELF but could be used on other targets. */
6947 int trampolines_created
;
6950 file_end_indicate_exec_stack (void)
6952 unsigned int flags
= SECTION_DEBUG
;
6953 if (trampolines_created
)
6954 flags
|= SECTION_CODE
;
6956 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
6959 /* Emit a special section directive to indicate that this object file
6960 was compiled with -fsplit-stack. This is used to let the linker
6961 detect calls between split-stack code and non-split-stack code, so
6962 that it can modify the split-stack code to allocate a sufficiently
6963 large stack. We emit another special section if there are any
6964 functions in this file which have the no_split_stack attribute, to
6965 prevent the linker from warning about being unable to convert the
6966 functions if they call non-split-stack code. */
6969 file_end_indicate_split_stack (void)
6971 if (flag_split_stack
)
6973 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
6975 if (saw_no_split_stack
)
6976 switch_to_section (get_section (".note.GNU-no-split-stack",
6977 SECTION_DEBUG
, NULL
));
6981 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6982 a get_unnamed_section callback. */
6985 output_section_asm_op (const void *directive
)
6987 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
6990 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6991 the current section is NEW_SECTION. */
6994 switch_to_section (section
*new_section
)
6996 if (in_section
== new_section
)
6999 if (new_section
->common
.flags
& SECTION_FORGET
)
7002 in_section
= new_section
;
7004 switch (SECTION_STYLE (new_section
))
7007 targetm
.asm_out
.named_section (new_section
->named
.name
,
7008 new_section
->named
.common
.flags
,
7009 new_section
->named
.decl
);
7012 case SECTION_UNNAMED
:
7013 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
7016 case SECTION_NOSWITCH
:
7021 new_section
->common
.flags
|= SECTION_DECLARED
;
7024 /* If block symbol SYMBOL has not yet been assigned an offset, place
7025 it at the end of its block. */
7028 place_block_symbol (rtx symbol
)
7030 unsigned HOST_WIDE_INT size
, mask
, offset
;
7031 struct constant_descriptor_rtx
*desc
;
7032 unsigned int alignment
;
7033 struct object_block
*block
;
7036 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7037 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7040 /* Work out the symbol's size and alignment. */
7041 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7043 desc
= SYMBOL_REF_CONSTANT (symbol
);
7044 alignment
= desc
->align
;
7045 size
= GET_MODE_SIZE (desc
->mode
);
7047 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7049 decl
= SYMBOL_REF_DECL (symbol
);
7050 alignment
= DECL_ALIGN (decl
);
7051 size
= get_constant_size (DECL_INITIAL (decl
));
7052 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7053 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7054 && asan_protect_global (DECL_INITIAL (decl
)))
7055 size
+= asan_red_zone_size (size
);
7059 struct symtab_node
*snode
;
7060 decl
= SYMBOL_REF_DECL (symbol
);
7062 snode
= symtab_node::get (decl
);
7065 rtx target
= DECL_RTL (snode
->ultimate_alias_target ()->decl
);
7067 place_block_symbol (target
);
7068 SYMBOL_REF_BLOCK_OFFSET (symbol
) = SYMBOL_REF_BLOCK_OFFSET (target
);
7071 alignment
= get_variable_align (decl
);
7072 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7073 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7074 && asan_protect_global (decl
))
7076 size
+= asan_red_zone_size (size
);
7077 alignment
= MAX (alignment
,
7078 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7082 /* Calculate the object's offset from the start of the block. */
7083 block
= SYMBOL_REF_BLOCK (symbol
);
7084 mask
= alignment
/ BITS_PER_UNIT
- 1;
7085 offset
= (block
->size
+ mask
) & ~mask
;
7086 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7088 /* Record the block's new alignment and size. */
7089 block
->alignment
= MAX (block
->alignment
, alignment
);
7090 block
->size
= offset
+ size
;
7092 vec_safe_push (block
->objects
, symbol
);
7095 /* Return the anchor that should be used to address byte offset OFFSET
7096 from the first object in BLOCK. MODEL is the TLS model used
7100 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7101 enum tls_model model
)
7104 unsigned int begin
, middle
, end
;
7105 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7108 /* Work out the anchor's offset. Use an offset of 0 for the first
7109 anchor so that we don't pessimize the case where we take the address
7110 of a variable at the beginning of the block. This is particularly
7111 useful when a block has only one variable assigned to it.
7113 We try to place anchors RANGE bytes apart, so there can then be
7114 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7115 a ptr_mode offset. With some target settings, the lowest such
7116 anchor might be out of range for the lowest ptr_mode offset;
7117 likewise the highest anchor for the highest offset. Use anchors
7118 at the extreme ends of the ptr_mode range in such cases.
7120 All arithmetic uses unsigned integers in order to avoid
7122 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7123 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7124 range
= max_offset
- min_offset
+ 1;
7129 bias
= 1 << (GET_MODE_BITSIZE (ptr_mode
) - 1);
7132 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7133 delta
-= delta
% range
;
7136 offset
= (HOST_WIDE_INT
) (-delta
);
7140 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7141 delta
-= delta
% range
;
7142 if (delta
> bias
- 1)
7144 offset
= (HOST_WIDE_INT
) delta
;
7148 /* Do a binary search to see if there's already an anchor we can use.
7149 Set BEGIN to the new anchor's index if not. */
7151 end
= vec_safe_length (block
->anchors
);
7152 while (begin
!= end
)
7154 middle
= (end
+ begin
) / 2;
7155 anchor
= (*block
->anchors
)[middle
];
7156 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7158 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7160 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7162 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7168 /* Create a new anchor with a unique label. */
7169 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7170 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7171 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7172 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7174 /* Insert it at index BEGIN. */
7175 vec_safe_insert (block
->anchors
, begin
, anchor
);
7179 /* Output the objects in BLOCK. */
7182 output_object_block (struct object_block
*block
)
7184 struct constant_descriptor_rtx
*desc
;
7186 HOST_WIDE_INT offset
;
7190 if (!block
->objects
)
7193 /* Switch to the section and make sure that the first byte is
7194 suitably aligned. */
7195 switch_to_section (block
->sect
);
7196 assemble_align (block
->alignment
);
7198 /* Define the values of all anchors relative to the current section
7200 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7201 targetm
.asm_out
.output_anchor (symbol
);
7203 /* Output the objects themselves. */
7205 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7207 /* Move to the object's offset, padding with zeros if necessary. */
7208 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7209 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7210 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7212 desc
= SYMBOL_REF_CONSTANT (symbol
);
7213 output_constant_pool_1 (desc
, 1);
7214 offset
+= GET_MODE_SIZE (desc
->mode
);
7216 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7219 decl
= SYMBOL_REF_DECL (symbol
);
7220 assemble_constant_contents (DECL_INITIAL (decl
), XSTR (symbol
, 0),
7222 size
= get_constant_size (DECL_INITIAL (decl
));
7224 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7225 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7226 && asan_protect_global (DECL_INITIAL (decl
)))
7228 size
= asan_red_zone_size (size
);
7229 assemble_zeros (size
);
7236 decl
= SYMBOL_REF_DECL (symbol
);
7237 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7238 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7240 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7241 && asan_protect_global (decl
))
7243 size
= asan_red_zone_size (size
);
7244 assemble_zeros (size
);
7251 /* A htab_traverse callback used to call output_object_block for
7252 each member of object_block_htab. */
7255 output_object_block_htab (object_block
**slot
, void *)
7257 output_object_block (*slot
);
7261 /* Output the definitions of all object_blocks. */
7264 output_object_blocks (void)
7266 object_block_htab
->traverse
<void *, output_object_block_htab
> (NULL
);
7269 /* This function provides a possible implementation of the
7270 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7271 by -frecord-gcc-switches it creates a new mergeable, string section in the
7272 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7273 contains the switches in ASCII format.
7275 FIXME: This code does not correctly handle double quote characters
7276 that appear inside strings, (it strips them rather than preserving them).
7277 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7278 characters - instead it treats them as sub-string separators. Since
7279 we want to emit NUL strings terminators into the object file we have to use
7283 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7287 case SWITCH_TYPE_PASSED
:
7288 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7289 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7292 case SWITCH_TYPE_DESCRIPTIVE
:
7295 /* Distinguish between invocations where name is NULL. */
7296 static bool started
= false;
7302 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7306 | (SECTION_ENTSIZE
& 1),
7308 switch_to_section (sec
);
7317 /* The return value is currently ignored by the caller, but must be 0.
7318 For -fverbose-asm the return value would be the number of characters
7319 emitted into the assembler file. */
7323 /* Emit text to declare externally defined symbols. It is needed to
7324 properly support non-default visibility. */
7326 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7328 const char *name ATTRIBUTE_UNUSED
)
7330 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7331 set in order to avoid putting out names that are never really
7333 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7334 && targetm
.binds_local_p (decl
))
7335 maybe_assemble_visibility (decl
);
7338 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7341 default_asm_output_source_filename (FILE *file
, const char *name
)
7343 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7344 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7346 fprintf (file
, "\t.file\t");
7347 output_quoted_string (file
, name
);
7352 /* Output a file name in the form wanted by System V. */
7355 output_file_directive (FILE *asm_file
, const char *input_name
)
7360 if (input_name
== NULL
)
7361 input_name
= "<stdin>";
7363 input_name
= remap_debug_filename (input_name
);
7365 len
= strlen (input_name
);
7366 na
= input_name
+ len
;
7368 /* NA gets INPUT_NAME sans directory names. */
7369 while (na
> input_name
)
7371 if (IS_DIR_SEPARATOR (na
[-1]))
7376 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7379 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7382 make_debug_expr_from_rtl (const_rtx exp
)
7384 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7385 enum machine_mode mode
= GET_MODE (exp
);
7388 DECL_ARTIFICIAL (ddecl
) = 1;
7389 if (REG_P (exp
) && REG_EXPR (exp
))
7390 type
= TREE_TYPE (REG_EXPR (exp
));
7391 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7392 type
= TREE_TYPE (MEM_EXPR (exp
));
7395 if (type
&& TYPE_MODE (type
) == mode
)
7396 TREE_TYPE (ddecl
) = type
;
7398 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7399 DECL_MODE (ddecl
) = mode
;
7400 dval
= gen_rtx_DEBUG_EXPR (mode
);
7401 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7402 SET_DECL_RTL (ddecl
, dval
);
7406 #ifdef ELF_ASCII_ESCAPES
7407 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7410 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7415 fputs (STRING_ASM_OP
, f
);
7420 escape
= ELF_ASCII_ESCAPES
[c
];
7427 /* TODO: Print in hex with fast function, important for -flto. */
7428 fprintf (f
, "\\%03o", c
);
7441 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7444 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7446 const char *limit
= s
+ len
;
7447 const char *last_null
= NULL
;
7448 unsigned bytes_in_chunk
= 0;
7452 for (; s
< limit
; s
++)
7456 if (bytes_in_chunk
>= 60)
7465 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7472 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7474 if (bytes_in_chunk
> 0)
7481 default_elf_asm_output_limited_string (f
, s
);
7486 if (bytes_in_chunk
== 0)
7487 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7490 escape
= ELF_ASCII_ESCAPES
[c
];
7498 /* TODO: Print in hex with fast function, important for -flto. */
7499 fprintf (f
, "\\%03o", c
);
7500 bytes_in_chunk
+= 4;
7505 bytes_in_chunk
+= 2;
7512 if (bytes_in_chunk
> 0)
7520 static GTY(()) section
*elf_init_array_section
;
7521 static GTY(()) section
*elf_fini_array_section
;
7524 get_elf_initfini_array_priority_section (int priority
,
7528 if (priority
!= DEFAULT_INIT_PRIORITY
)
7531 sprintf (buf
, "%s.%.5u",
7532 constructor_p
? ".init_array" : ".fini_array",
7534 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7540 if (elf_init_array_section
== NULL
)
7541 elf_init_array_section
7542 = get_section (".init_array",
7543 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7544 sec
= elf_init_array_section
;
7548 if (elf_fini_array_section
== NULL
)
7549 elf_fini_array_section
7550 = get_section (".fini_array",
7551 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7552 sec
= elf_fini_array_section
;
7558 /* Use .init_array section for constructors. */
7561 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7563 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7565 assemble_addr_to_section (symbol
, sec
);
7568 /* Use .fini_array section for destructors. */
7571 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7573 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7575 assemble_addr_to_section (symbol
, sec
);
7578 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7580 This is a bit of a cheat. The real default is a no-op, but this
7581 hook is the default for all targets with a .ident directive. */
7584 default_asm_output_ident_directive (const char *ident_str
)
7586 const char *ident_asm_op
= "\t.ident\t";
7588 /* If we are still in the front end, do not write out the string
7589 to asm_out_file. Instead, add a fake top-level asm statement.
7590 This allows the front ends to use this hook without actually
7591 writing to asm_out_file, to handle #ident or Pragma Ident. */
7592 if (symtab
->state
== PARSING
)
7594 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7595 symtab
->finalize_toplevel_asm (build_string (strlen (buf
), buf
));
7598 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7601 #include "gt-varasm.h"