1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987-2015 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"
40 #include "fold-const.h"
41 #include "stor-layout.h"
42 #include "stringpool.h"
45 #include "hard-reg-set.h"
48 #include "statistics.h"
49 #include "insn-config.h"
59 #include "diagnostic-core.h"
61 #include "langhooks.h"
65 #include "common/common-target.h"
66 #include "targhooks.h"
68 #include "dominance.h"
70 #include "basic-block.h"
73 #include "plugin-api.h"
78 #include "tree-chkp.h"
80 #ifdef XCOFF_DEBUGGING_INFO
81 #include "xcoffout.h" /* Needed for external data
82 declarations for e.g. AIX 4.x. */
85 /* The (assembler) name of the first globally-visible object output. */
86 extern GTY(()) const char *first_global_object_name
;
87 extern GTY(()) const char *weak_global_object_name
;
89 const char *first_global_object_name
;
90 const char *weak_global_object_name
;
93 struct constant_descriptor_rtx
;
94 struct rtx_constant_pool
;
96 #define n_deferred_constants (crtl->varasm.deferred_constants)
98 /* Number for making the label on the next
99 constant that is stored in memory. */
101 static GTY(()) int const_labelno
;
103 /* Carry information from ASM_DECLARE_OBJECT_NAME
104 to ASM_FINISH_DECLARE_OBJECT. */
106 int size_directive_output
;
108 /* The last decl for which assemble_variable was called,
109 if it did ASM_DECLARE_OBJECT_NAME.
110 If the last call to assemble_variable didn't do that,
113 tree last_assemble_variable_decl
;
115 /* The following global variable indicates if the first basic block
116 in a function belongs to the cold partition or not. */
118 bool first_function_block_is_cold
;
120 /* Whether we saw any functions with no_split_stack. */
122 static bool saw_no_split_stack
;
124 static const char *strip_reg_name (const char *);
125 static int contains_pointers_p (tree
);
126 #ifdef ASM_OUTPUT_EXTERNAL
127 static bool incorporeal_function_p (tree
);
129 static void decode_addr_const (tree
, struct addr_const
*);
130 static hashval_t
const_hash_1 (const tree
);
131 static int compare_constant (const tree
, const tree
);
132 static void output_constant_def_contents (rtx
);
133 static void output_addressed_constants (tree
);
134 static unsigned HOST_WIDE_INT
output_constant (tree
, unsigned HOST_WIDE_INT
,
136 static void globalize_decl (tree
);
137 static bool decl_readonly_section_1 (enum section_category
);
138 #ifdef BSS_SECTION_ASM_OP
139 #ifdef ASM_OUTPUT_ALIGNED_BSS
140 static void asm_output_aligned_bss (FILE *, tree
, const char *,
141 unsigned HOST_WIDE_INT
, int)
144 #endif /* BSS_SECTION_ASM_OP */
145 static void mark_weak (tree
);
146 static void output_constant_pool (const char *, tree
);
148 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
149 section
*text_section
;
150 section
*data_section
;
151 section
*readonly_data_section
;
152 section
*sdata_section
;
153 section
*ctors_section
;
154 section
*dtors_section
;
155 section
*bss_section
;
156 section
*sbss_section
;
158 /* Various forms of common section. All are guaranteed to be nonnull. */
159 section
*tls_comm_section
;
160 section
*comm_section
;
161 section
*lcomm_section
;
163 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
165 section
*bss_noswitch_section
;
167 /* The section that holds the main exception table, when known. The section
168 is set either by the target's init_sections hook or by the first call to
169 switch_to_exception_section. */
170 section
*exception_section
;
172 /* The section that holds the DWARF2 frame unwind information, when known.
173 The section is set either by the target's init_sections hook or by the
174 first call to switch_to_eh_frame_section. */
175 section
*eh_frame_section
;
177 /* asm_out_file's current section. This is NULL if no section has yet
178 been selected or if we lose track of what the current section is. */
181 /* True if code for the current function is currently being directed
182 at the cold section. */
183 bool in_cold_section_p
;
185 /* The following global holds the "function name" for the code in the
186 cold section of a function, if hot/cold function splitting is enabled
187 and there was actually code that went into the cold section. A
188 pseudo function name is needed for the cold section of code for some
189 debugging tools that perform symbolization. */
190 tree cold_function_name
= NULL_TREE
;
192 /* A linked list of all the unnamed sections. */
193 static GTY(()) section
*unnamed_sections
;
195 /* Return a nonzero value if DECL has a section attribute. */
196 #define IN_NAMED_SECTION(DECL) \
197 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
198 && DECL_SECTION_NAME (DECL) != NULL)
200 struct section_hasher
: ggc_hasher
<section
*>
202 typedef const char *compare_type
;
204 static hashval_t
hash (section
*);
205 static bool equal (section
*, const char *);
208 /* Hash table of named sections. */
209 static GTY(()) hash_table
<section_hasher
> *section_htab
;
211 struct object_block_hasher
: ggc_hasher
<object_block
*>
213 typedef const section
*compare_type
;
215 static hashval_t
hash (object_block
*);
216 static bool equal (object_block
*, const section
*);
219 /* A table of object_blocks, indexed by section. */
220 static GTY(()) hash_table
<object_block_hasher
> *object_block_htab
;
222 /* The next number to use for internal anchor labels. */
223 static GTY(()) int anchor_labelno
;
225 /* A pool of constants that can be shared between functions. */
226 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
228 /* Helper routines for maintaining section_htab. */
231 section_hasher::equal (section
*old
, const char *new_name
)
233 return strcmp (old
->named
.name
, new_name
) == 0;
237 section_hasher::hash (section
*old
)
239 return htab_hash_string (old
->named
.name
);
242 /* Return a hash value for section SECT. */
245 hash_section (section
*sect
)
247 if (sect
->common
.flags
& SECTION_NAMED
)
248 return htab_hash_string (sect
->named
.name
);
249 return sect
->common
.flags
;
252 /* Helper routines for maintaining object_block_htab. */
255 object_block_hasher::equal (object_block
*old
, const section
*new_section
)
257 return old
->sect
== new_section
;
261 object_block_hasher::hash (object_block
*old
)
263 return hash_section (old
->sect
);
266 /* Return a new unnamed section with the given fields. */
269 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
274 sect
= ggc_alloc
<section
> ();
275 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
276 sect
->unnamed
.callback
= callback
;
277 sect
->unnamed
.data
= data
;
278 sect
->unnamed
.next
= unnamed_sections
;
280 unnamed_sections
= sect
;
284 /* Return a SECTION_NOSWITCH section with the given fields. */
287 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
291 sect
= ggc_alloc
<section
> ();
292 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
293 sect
->noswitch
.callback
= callback
;
298 /* Return the named section structure associated with NAME. Create
299 a new section with the given fields if no such structure exists. */
302 get_section (const char *name
, unsigned int flags
, tree decl
)
304 section
*sect
, **slot
;
306 slot
= section_htab
->find_slot_with_hash (name
, htab_hash_string (name
),
308 flags
|= SECTION_NAMED
;
311 sect
= ggc_alloc
<section
> ();
312 sect
->named
.common
.flags
= flags
;
313 sect
->named
.name
= ggc_strdup (name
);
314 sect
->named
.decl
= decl
;
320 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
321 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
323 /* It is fine if one of the section flags is
324 SECTION_WRITE | SECTION_RELRO and the other has none of these
325 flags (i.e. read-only) in named sections and either the
326 section hasn't been declared yet or has been declared as writable.
327 In that case just make sure the resulting flags are
328 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
330 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
331 == (SECTION_WRITE
| SECTION_RELRO
)
332 && (sect
->common
.flags
333 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
334 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
335 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
336 || (sect
->common
.flags
& SECTION_WRITE
)))
338 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
341 /* Sanity check user variables for flag changes. */
342 if (sect
->named
.decl
!= NULL
343 && DECL_P (sect
->named
.decl
)
344 && decl
!= sect
->named
.decl
)
346 if (decl
!= NULL
&& DECL_P (decl
))
347 error ("%+D causes a section type conflict with %D",
348 decl
, sect
->named
.decl
);
350 error ("section type conflict with %D", sect
->named
.decl
);
351 inform (DECL_SOURCE_LOCATION (sect
->named
.decl
),
352 "%qD was declared here", sect
->named
.decl
);
354 else if (decl
!= NULL
&& DECL_P (decl
))
355 error ("%+D causes a section type conflict", decl
);
357 error ("section type conflict");
358 /* Make sure we don't error about one section multiple times. */
359 sect
->common
.flags
|= SECTION_OVERRIDE
;
365 /* Return true if the current compilation mode benefits from having
366 objects grouped into blocks. */
369 use_object_blocks_p (void)
371 return flag_section_anchors
;
374 /* Return the object_block structure for section SECT. Create a new
375 structure if we haven't created one already. Return null if SECT
378 static struct object_block
*
379 get_block_for_section (section
*sect
)
381 struct object_block
*block
;
387 = object_block_htab
->find_slot_with_hash (sect
, hash_section (sect
),
392 block
= ggc_cleared_alloc
<object_block
> ();
399 /* Create a symbol with label LABEL and place it at byte offset
400 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
401 is not yet known. LABEL must be a garbage-collected string. */
404 create_block_symbol (const char *label
, struct object_block
*block
,
405 HOST_WIDE_INT offset
)
410 /* Create the extended SYMBOL_REF. */
411 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
412 symbol
= (rtx
) ggc_internal_alloc (size
);
414 /* Initialize the normal SYMBOL_REF fields. */
415 memset (symbol
, 0, size
);
416 PUT_CODE (symbol
, SYMBOL_REF
);
417 PUT_MODE (symbol
, Pmode
);
418 XSTR (symbol
, 0) = label
;
419 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
421 /* Initialize the block_symbol stuff. */
422 SYMBOL_REF_BLOCK (symbol
) = block
;
423 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
428 /* Return a section with a particular name and with whatever SECTION_*
429 flags section_type_flags deems appropriate. The name of the section
430 is taken from NAME if nonnull, otherwise it is taken from DECL's
431 DECL_SECTION_NAME. DECL is the decl associated with the section
432 (see the section comment for details) and RELOC is as for
433 section_type_flags. */
436 get_named_section (tree decl
, const char *name
, int reloc
)
442 gcc_assert (decl
&& DECL_P (decl
) && DECL_SECTION_NAME (decl
));
443 name
= DECL_SECTION_NAME (decl
);
446 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
447 return get_section (name
, flags
, decl
);
450 /* Worker for resolve_unique_section. */
453 set_implicit_section (struct symtab_node
*n
, void *data ATTRIBUTE_UNUSED
)
455 n
->implicit_section
= true;
459 /* If required, set DECL_SECTION_NAME to a unique name. */
462 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
463 int flag_function_or_data_sections
)
465 if (DECL_SECTION_NAME (decl
) == NULL
466 && targetm_common
.have_named_sections
467 && (flag_function_or_data_sections
468 || DECL_COMDAT_GROUP (decl
)))
470 targetm
.asm_out
.unique_section (decl
, reloc
);
471 if (DECL_SECTION_NAME (decl
))
472 symtab_node::get (decl
)->call_for_symbol_and_aliases
473 (set_implicit_section
, NULL
, true);
477 #ifdef BSS_SECTION_ASM_OP
479 #ifdef ASM_OUTPUT_ALIGNED_BSS
481 /* Utility function for targets to use in implementing
482 ASM_OUTPUT_ALIGNED_BSS.
483 ??? It is believed that this function will work in most cases so such
484 support is localized here. */
487 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
488 const char *name
, unsigned HOST_WIDE_INT size
,
491 switch_to_section (bss_section
);
492 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
493 #ifdef ASM_DECLARE_OBJECT_NAME
494 last_assemble_variable_decl
= decl
;
495 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
497 /* Standard thing is just output label for the object. */
498 ASM_OUTPUT_LABEL (file
, name
);
499 #endif /* ASM_DECLARE_OBJECT_NAME */
500 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
505 #endif /* BSS_SECTION_ASM_OP */
507 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
508 /* Return the hot section for function DECL. Return text_section for
512 hot_function_section (tree decl
)
514 if (decl
!= NULL_TREE
515 && DECL_SECTION_NAME (decl
) != NULL
516 && targetm_common
.have_named_sections
)
517 return get_named_section (decl
, NULL
, 0);
523 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
526 When DECL_SECTION_NAME is non-NULL and it is implicit section and
527 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
528 concatenate the name with NAMED_SECTION_SUFFIX.
529 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
532 get_named_text_section (tree decl
,
533 const char *text_section_name
,
534 const char *named_section_suffix
)
536 if (decl
&& DECL_SECTION_NAME (decl
))
538 if (named_section_suffix
)
540 const char *dsn
= DECL_SECTION_NAME (decl
);
541 const char *stripped_name
;
544 name
= (char *) alloca (strlen (dsn
) + 1);
548 stripped_name
= targetm
.strip_name_encoding (name
);
550 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
551 return get_named_section (decl
, buffer
, 0);
553 else if (symtab_node::get (decl
)->implicit_section
)
557 /* Do not try to split gnu_linkonce functions. This gets somewhat
559 if (DECL_COMDAT_GROUP (decl
) && !HAVE_COMDAT_GROUP
)
561 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
562 name
= targetm
.strip_name_encoding (name
);
563 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
569 return get_named_section (decl
, text_section_name
, 0);
572 /* Choose named function section based on its frequency. */
575 default_function_section (tree decl
, enum node_frequency freq
,
576 bool startup
, bool exit
)
578 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
579 /* Old GNU linkers have buggy --gc-section support, which sometimes
580 results in .gcc_except_table* sections being garbage collected. */
582 && symtab_node::get (decl
)->implicit_section
)
586 if (!flag_reorder_functions
587 || !targetm_common
.have_named_sections
)
589 /* Startup code should go to startup subsection unless it is
590 unlikely executed (this happens especially with function splitting
591 where we can split away unnecessary parts of static constructors. */
592 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
594 /* If we do have a profile or(and) LTO phase is executed, we do not need
595 these ELF section. */
596 if (!in_lto_p
|| !flag_profile_values
)
597 return get_named_text_section (decl
, ".text.startup", NULL
);
602 /* Similarly for exit. */
603 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
604 return get_named_text_section (decl
, ".text.exit", NULL
);
606 /* Group cold functions together, similarly for hot code. */
609 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
610 return get_named_text_section (decl
, ".text.unlikely", NULL
);
611 case NODE_FREQUENCY_HOT
:
612 /* If we do have a profile or(and) LTO phase is executed, we do not need
613 these ELF section. */
614 if (!in_lto_p
|| !flag_profile_values
)
615 return get_named_text_section (decl
, ".text.hot", NULL
);
621 /* Return the section for function DECL.
623 If DECL is NULL_TREE, return the text section. We can be passed
624 NULL_TREE under some circumstances by dbxout.c at least.
626 If FORCE_COLD is true, return cold function section ignoring
627 the frequency info of cgraph_node. */
630 function_section_1 (tree decl
, bool force_cold
)
632 section
*section
= NULL
;
633 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
634 bool startup
= false, exit
= false;
638 struct cgraph_node
*node
= cgraph_node::get (decl
);
642 freq
= node
->frequency
;
643 startup
= node
->only_called_at_startup
;
644 exit
= node
->only_called_at_exit
;
648 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
650 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
651 if (decl
!= NULL_TREE
652 && DECL_SECTION_NAME (decl
) != NULL
)
654 if (targetm
.asm_out
.function_section
)
655 section
= targetm
.asm_out
.function_section (decl
, freq
,
659 return get_named_section (decl
, NULL
, 0);
662 return targetm
.asm_out
.select_section
663 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
664 symtab_node::get (decl
)->definition_alignment ());
666 if (targetm
.asm_out
.function_section
)
667 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
670 return hot_function_section (decl
);
674 /* Return the section for function DECL.
676 If DECL is NULL_TREE, return the text section. We can be passed
677 NULL_TREE under some circumstances by dbxout.c at least. */
680 function_section (tree decl
)
682 /* Handle cases where function splitting code decides
683 to put function entry point into unlikely executed section
684 despite the fact that the function itself is not cold
685 (i.e. it is called rarely but contains a hot loop that is
686 better to live in hot subsection for the code locality). */
687 return function_section_1 (decl
,
688 first_function_block_is_cold
);
691 /* Return the section for the current function, take IN_COLD_SECTION_P
695 current_function_section (void)
697 return function_section_1 (current_function_decl
, in_cold_section_p
);
700 /* Tell assembler to switch to unlikely-to-be-executed text section. */
703 unlikely_text_section (void)
705 return function_section_1 (current_function_decl
, true);
708 /* When called within a function context, return true if the function
709 has been assigned a cold text section and if SECT is that section.
710 When called outside a function context, return true if SECT is the
711 default cold section. */
714 unlikely_text_section_p (section
*sect
)
716 return sect
== function_section_1 (current_function_decl
, true);
719 /* Return the read-only data section associated with function DECL. */
722 default_function_rodata_section (tree decl
)
724 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
726 const char *name
= DECL_SECTION_NAME (decl
);
728 if (DECL_COMDAT_GROUP (decl
) && HAVE_COMDAT_GROUP
)
734 dot
= strchr (name
+ 1, '.');
737 len
= strlen (dot
) + 8;
738 rname
= (char *) alloca (len
);
740 strcpy (rname
, ".rodata");
742 return get_section (rname
, SECTION_LINKONCE
, decl
);
744 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
745 else if (DECL_COMDAT_GROUP (decl
)
746 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
748 size_t len
= strlen (name
) + 1;
749 char *rname
= (char *) alloca (len
);
751 memcpy (rname
, name
, len
);
753 return get_section (rname
, SECTION_LINKONCE
, decl
);
755 /* For .text.foo we want to use .rodata.foo. */
756 else if (flag_function_sections
&& flag_data_sections
757 && strncmp (name
, ".text.", 6) == 0)
759 size_t len
= strlen (name
) + 1;
760 char *rname
= (char *) alloca (len
+ 2);
762 memcpy (rname
, ".rodata", 7);
763 memcpy (rname
+ 7, name
+ 5, len
- 5);
764 return get_section (rname
, 0, decl
);
768 return readonly_data_section
;
771 /* Return the read-only data section associated with function DECL
772 for targets where that section should be always the single
773 readonly data section. */
776 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
778 return readonly_data_section
;
781 /* A subroutine of mergeable_string_section and mergeable_constant_section. */
784 function_mergeable_rodata_prefix (void)
786 section
*s
= targetm
.asm_out
.function_rodata_section (current_function_decl
);
787 if (SECTION_STYLE (s
) == SECTION_NAMED
)
788 return s
->named
.name
;
790 return targetm
.asm_out
.mergeable_rodata_prefix
;
793 /* Return the section to use for string merging. */
796 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
797 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
798 unsigned int flags ATTRIBUTE_UNUSED
)
802 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
803 && TREE_CODE (decl
) == STRING_CST
804 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
806 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
807 && TREE_STRING_LENGTH (decl
) >= len
)
810 unsigned int modesize
;
814 const char *prefix
= function_mergeable_rodata_prefix ();
815 char *name
= (char *) alloca (strlen (prefix
) + 30);
817 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
818 modesize
= GET_MODE_BITSIZE (mode
);
819 if (modesize
>= 8 && modesize
<= 256
820 && (modesize
& (modesize
- 1)) == 0)
822 if (align
< modesize
)
825 str
= TREE_STRING_POINTER (decl
);
826 unit
= GET_MODE_SIZE (mode
);
828 /* Check for embedded NUL characters. */
829 for (i
= 0; i
< len
; i
+= unit
)
831 for (j
= 0; j
< unit
; j
++)
832 if (str
[i
+ j
] != '\0')
839 sprintf (name
, "%s.str%d.%d", prefix
,
840 modesize
/ 8, (int) (align
/ 8));
841 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
842 return get_section (name
, flags
, NULL
);
847 return readonly_data_section
;
850 /* Return the section to use for constant merging. */
853 mergeable_constant_section (machine_mode mode ATTRIBUTE_UNUSED
,
854 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
855 unsigned int flags ATTRIBUTE_UNUSED
)
857 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
859 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
865 && (align
& (align
- 1)) == 0)
867 const char *prefix
= function_mergeable_rodata_prefix ();
868 char *name
= (char *) alloca (strlen (prefix
) + 30);
870 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
871 flags
|= (align
/ 8) | SECTION_MERGE
;
872 return get_section (name
, flags
, NULL
);
874 return readonly_data_section
;
877 /* Given NAME, a putative register name, discard any customary prefixes. */
880 strip_reg_name (const char *name
)
882 #ifdef REGISTER_PREFIX
883 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
884 name
+= strlen (REGISTER_PREFIX
);
886 if (name
[0] == '%' || name
[0] == '#')
891 /* The user has asked for a DECL to have a particular name. Set (or
892 change) it in such a way that we don't prefix an underscore to
895 set_user_assembler_name (tree decl
, const char *name
)
897 char *starred
= (char *) alloca (strlen (name
) + 2);
899 strcpy (starred
+ 1, name
);
900 symtab
->change_decl_assembler_name (decl
, get_identifier (starred
));
901 SET_DECL_RTL (decl
, NULL_RTX
);
904 /* Decode an `asm' spec for a declaration as a register name.
905 Return the register number, or -1 if nothing specified,
906 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
907 or -3 if ASMSPEC is `cc' and is not recognized,
908 or -4 if ASMSPEC is `memory' and is not recognized.
909 Accept an exact spelling or a decimal number.
910 Prefixes such as % are optional. */
913 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
915 /* Presume just one register is clobbered. */
922 /* Get rid of confusing prefixes. */
923 asmspec
= strip_reg_name (asmspec
);
925 /* Allow a decimal number as a "register name". */
926 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
927 if (! ISDIGIT (asmspec
[i
]))
929 if (asmspec
[0] != 0 && i
< 0)
932 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0 && reg_names
[i
][0])
938 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
940 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
943 #ifdef OVERLAPPING_REGISTER_NAMES
947 const char *const name
;
950 } table
[] = OVERLAPPING_REGISTER_NAMES
;
952 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
954 && ! strcmp (asmspec
, table
[i
].name
))
956 *pnregs
= table
[i
].nregs
;
957 return table
[i
].number
;
960 #endif /* OVERLAPPING_REGISTER_NAMES */
962 #ifdef ADDITIONAL_REGISTER_NAMES
964 static const struct { const char *const name
; const int number
; } table
[]
965 = ADDITIONAL_REGISTER_NAMES
;
967 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
969 && ! strcmp (asmspec
, table
[i
].name
)
970 && reg_names
[table
[i
].number
][0])
971 return table
[i
].number
;
973 #endif /* ADDITIONAL_REGISTER_NAMES */
975 if (!strcmp (asmspec
, "memory"))
978 if (!strcmp (asmspec
, "cc"))
988 decode_reg_name (const char *name
)
991 return decode_reg_name_and_count (name
, &count
);
995 /* Return true if DECL's initializer is suitable for a BSS section. */
998 bss_initializer_p (const_tree decl
)
1000 return (DECL_INITIAL (decl
) == NULL
1001 /* In LTO we have no errors in program; error_mark_node is used
1002 to mark offlined constructors. */
1003 || (DECL_INITIAL (decl
) == error_mark_node
1005 || (flag_zero_initialized_in_bss
1006 /* Leave constant zeroes in .rodata so they
1008 && !TREE_READONLY (decl
)
1009 && initializer_zerop (DECL_INITIAL (decl
))));
1012 /* Compute the alignment of variable specified by DECL.
1013 DONT_OUTPUT_DATA is from assemble_variable. */
1016 align_variable (tree decl
, bool dont_output_data
)
1018 unsigned int align
= DECL_ALIGN (decl
);
1020 /* In the case for initialing an array whose length isn't specified,
1021 where we have not yet been able to do the layout,
1022 figure out the proper alignment now. */
1023 if (dont_output_data
&& DECL_SIZE (decl
) == 0
1024 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
1025 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
1027 /* Some object file formats have a maximum alignment which they support.
1028 In particular, a.out format supports a maximum alignment of 4. */
1029 if (align
> MAX_OFILE_ALIGNMENT
)
1031 error ("alignment of %q+D is greater than maximum object "
1032 "file alignment %d", decl
,
1033 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
1034 align
= MAX_OFILE_ALIGNMENT
;
1037 if (! DECL_USER_ALIGN (decl
))
1039 #ifdef DATA_ABI_ALIGNMENT
1040 unsigned int data_abi_align
1041 = DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1042 /* For backwards compatibility, don't assume the ABI alignment for
1044 if (! DECL_THREAD_LOCAL_P (decl
) || data_abi_align
<= BITS_PER_WORD
)
1045 align
= data_abi_align
;
1048 /* On some machines, it is good to increase alignment sometimes.
1049 But as DECL_ALIGN is used both for actually emitting the variable
1050 and for code accessing the variable as guaranteed alignment, we
1051 can only increase the alignment if it is a performance optimization
1052 if the references to it must bind to the current definition. */
1053 if (decl_binds_to_current_def_p (decl
)
1054 && !DECL_VIRTUAL_P (decl
))
1056 #ifdef DATA_ALIGNMENT
1057 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1058 /* Don't increase alignment too much for TLS variables - TLS space
1060 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1063 #ifdef CONSTANT_ALIGNMENT
1064 if (DECL_INITIAL (decl
) != 0
1065 /* In LTO we have no errors in program; error_mark_node is used
1066 to mark offlined constructors. */
1067 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1069 unsigned int const_align
1070 = CONSTANT_ALIGNMENT (DECL_INITIAL (decl
), align
);
1071 /* Don't increase alignment too much for TLS variables - TLS
1072 space is too precious. */
1073 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1074 align
= const_align
;
1080 /* Reset the alignment in case we have made it tighter, so we can benefit
1081 from it in get_pointer_alignment. */
1082 DECL_ALIGN (decl
) = align
;
1085 /* Return DECL_ALIGN (decl), possibly increased for optimization purposes
1086 beyond what align_variable returned. */
1089 get_variable_align (tree decl
)
1091 unsigned int align
= DECL_ALIGN (decl
);
1093 /* For user aligned vars or static vars align_variable already did
1095 if (DECL_USER_ALIGN (decl
) || !TREE_PUBLIC (decl
))
1098 #ifdef DATA_ABI_ALIGNMENT
1099 if (DECL_THREAD_LOCAL_P (decl
))
1100 align
= DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1103 /* For decls that bind to the current definition, align_variable
1104 did also everything, except for not assuming ABI required alignment
1105 of TLS variables. For other vars, increase the alignment here
1106 as an optimization. */
1107 if (!decl_binds_to_current_def_p (decl
))
1109 /* On some machines, it is good to increase alignment sometimes. */
1110 #ifdef DATA_ALIGNMENT
1111 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1112 /* Don't increase alignment too much for TLS variables - TLS space
1114 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1117 #ifdef CONSTANT_ALIGNMENT
1118 if (DECL_INITIAL (decl
) != 0
1119 /* In LTO we have no errors in program; error_mark_node is used
1120 to mark offlined constructors. */
1121 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1123 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
1125 /* Don't increase alignment too much for TLS variables - TLS space
1127 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1128 align
= const_align
;
1136 /* Return the section into which the given VAR_DECL or CONST_DECL
1137 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1138 section should be used wherever possible. */
1141 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1143 addr_space_t as
= ADDR_SPACE_GENERIC
;
1145 varpool_node
*vnode
= varpool_node::get (decl
);
1148 vnode
= vnode
->ultimate_alias_target ();
1152 if (TREE_TYPE (decl
) != error_mark_node
)
1153 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1155 /* We need the constructor to figure out reloc flag. */
1157 vnode
->get_constructor ();
1159 if (DECL_COMMON (decl
))
1161 /* If the decl has been given an explicit section name, or it resides
1162 in a non-generic address space, then it isn't common, and shouldn't
1163 be handled as such. */
1164 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1165 && ADDR_SPACE_GENERIC_P (as
));
1166 if (DECL_THREAD_LOCAL_P (decl
))
1167 return tls_comm_section
;
1168 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1169 return comm_section
;
1172 if (DECL_INITIAL (decl
) == error_mark_node
)
1173 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1174 else if (DECL_INITIAL (decl
))
1175 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1179 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1180 if (IN_NAMED_SECTION (decl
))
1181 return get_named_section (decl
, NULL
, reloc
);
1183 if (ADDR_SPACE_GENERIC_P (as
)
1184 && !DECL_THREAD_LOCAL_P (decl
)
1185 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1186 && bss_initializer_p (decl
))
1188 if (!TREE_PUBLIC (decl
)
1189 && !((flag_sanitize
& SANITIZE_ADDRESS
)
1190 && asan_protect_global (decl
)))
1191 return lcomm_section
;
1192 if (bss_noswitch_section
)
1193 return bss_noswitch_section
;
1196 return targetm
.asm_out
.select_section (decl
, reloc
,
1197 get_variable_align (decl
));
1200 /* Return the block into which object_block DECL should be placed. */
1202 static struct object_block
*
1203 get_block_for_decl (tree decl
)
1207 if (TREE_CODE (decl
) == VAR_DECL
)
1209 /* The object must be defined in this translation unit. */
1210 if (DECL_EXTERNAL (decl
))
1213 /* There's no point using object blocks for something that is
1214 isolated by definition. */
1215 if (DECL_COMDAT_GROUP (decl
))
1219 /* We can only calculate block offsets if the decl has a known
1221 if (DECL_SIZE_UNIT (decl
) == NULL
)
1223 if (!tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
)))
1226 /* Find out which section should contain DECL. We cannot put it into
1227 an object block if it requires a standalone definition. */
1228 if (TREE_CODE (decl
) == VAR_DECL
)
1229 align_variable (decl
, 0);
1230 sect
= get_variable_section (decl
, true);
1231 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1234 return get_block_for_section (sect
);
1237 /* Make sure block symbol SYMBOL is in block BLOCK. */
1240 change_symbol_block (rtx symbol
, struct object_block
*block
)
1242 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1244 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1245 SYMBOL_REF_BLOCK (symbol
) = block
;
1249 /* Return true if it is possible to put DECL in an object_block. */
1252 use_blocks_for_decl_p (tree decl
)
1254 struct symtab_node
*snode
;
1256 /* Only data DECLs can be placed into object blocks. */
1257 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1260 /* Detect decls created by dw2_force_const_mem. Such decls are
1261 special because DECL_INITIAL doesn't specify the decl's true value.
1262 dw2_output_indirect_constants will instead call assemble_variable
1263 with dont_output_data set to 1 and then print the contents itself. */
1264 if (DECL_INITIAL (decl
) == decl
)
1267 /* If this decl is an alias, then we don't want to emit a
1269 if (TREE_CODE (decl
) == VAR_DECL
1270 && (snode
= symtab_node::get (decl
)) != NULL
1274 return targetm
.use_blocks_for_decl_p (decl
);
1277 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
1278 until we find an identifier that is not itself a transparent alias.
1279 Modify the alias passed to it by reference (and all aliases on the
1280 way to the ultimate target), such that they do not have to be
1281 followed again, and return the ultimate target of the alias
1285 ultimate_transparent_alias_target (tree
*alias
)
1287 tree target
= *alias
;
1289 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
1291 gcc_assert (TREE_CHAIN (target
));
1292 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
1293 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
1294 && ! TREE_CHAIN (target
));
1301 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1302 have static storage duration. In other words, it should not be an
1303 automatic variable, including PARM_DECLs.
1305 There is, however, one exception: this function handles variables
1306 explicitly placed in a particular register by the user.
1308 This is never called for PARM_DECL nodes. */
1311 make_decl_rtl (tree decl
)
1313 const char *name
= 0;
1318 /* Check that we are not being given an automatic variable. */
1319 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1320 && TREE_CODE (decl
) != RESULT_DECL
);
1322 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1323 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1324 || TREE_STATIC (decl
)
1325 || TREE_PUBLIC (decl
)
1326 || DECL_EXTERNAL (decl
)
1327 || DECL_REGISTER (decl
));
1329 /* And that we were not given a type or a label. */
1330 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1331 && TREE_CODE (decl
) != LABEL_DECL
);
1333 /* For a duplicate declaration, we can be called twice on the
1334 same DECL node. Don't discard the RTL already made. */
1335 if (DECL_RTL_SET_P (decl
))
1337 /* If the old RTL had the wrong mode, fix the mode. */
1338 x
= DECL_RTL (decl
);
1339 if (GET_MODE (x
) != DECL_MODE (decl
))
1340 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1342 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1345 /* ??? Another way to do this would be to maintain a hashed
1346 table of such critters. Instead of adding stuff to a DECL
1347 to give certain attributes to it, we could use an external
1348 hash map from DECL to set of attributes. */
1350 /* Let the target reassign the RTL if it wants.
1351 This is necessary, for example, when one machine specific
1352 decl attribute overrides another. */
1353 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1355 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1356 on the new decl information. */
1358 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1359 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1360 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1365 /* If this variable belongs to the global constant pool, retrieve the
1366 pre-computed RTL or recompute it in LTO mode. */
1367 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_IN_CONSTANT_POOL (decl
))
1369 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1373 id
= DECL_ASSEMBLER_NAME (decl
);
1374 if (TREE_CODE (decl
) == FUNCTION_DECL
1375 && cgraph_node::get (decl
)
1376 && cgraph_node::get (decl
)->instrumentation_clone
)
1377 ultimate_transparent_alias_target (&id
);
1378 name
= IDENTIFIER_POINTER (id
);
1380 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1381 && DECL_REGISTER (decl
))
1383 error ("register name not specified for %q+D", decl
);
1385 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1387 const char *asmspec
= name
+1;
1388 machine_mode mode
= DECL_MODE (decl
);
1389 reg_number
= decode_reg_name (asmspec
);
1390 /* First detect errors in declaring global registers. */
1391 if (reg_number
== -1)
1392 error ("register name not specified for %q+D", decl
);
1393 else if (reg_number
< 0)
1394 error ("invalid register name for %q+D", decl
);
1395 else if (mode
== BLKmode
)
1396 error ("data type of %q+D isn%'t suitable for a register",
1398 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1399 error ("the register specified for %q+D cannot be accessed"
1400 " by the current target", decl
);
1401 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1402 error ("the register specified for %q+D is not general enough"
1403 " to be used as a register variable", decl
);
1404 else if (!HARD_REGNO_MODE_OK (reg_number
, mode
))
1405 error ("register specified for %q+D isn%'t suitable for data type",
1407 /* Now handle properly declared static register variables. */
1412 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1414 DECL_INITIAL (decl
) = 0;
1415 error ("global register variable has initial value");
1417 if (TREE_THIS_VOLATILE (decl
))
1418 warning (OPT_Wvolatile_register_var
,
1419 "optimization may eliminate reads and/or "
1420 "writes to register variables");
1422 /* If the user specified one of the eliminables registers here,
1423 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1424 confused with that register and be eliminated. This usage is
1425 somewhat suspect... */
1427 SET_DECL_RTL (decl
, gen_raw_REG (mode
, reg_number
));
1428 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1429 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1431 if (TREE_STATIC (decl
))
1433 /* Make this register global, so not usable for anything
1435 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1436 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1437 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1439 nregs
= hard_regno_nregs
[reg_number
][mode
];
1441 globalize_reg (decl
, reg_number
+ --nregs
);
1444 /* As a register variable, it has no section. */
1447 /* Avoid internal errors from invalid register
1449 SET_DECL_ASSEMBLER_NAME (decl
, NULL_TREE
);
1450 DECL_HARD_REGISTER (decl
) = 0;
1453 /* Now handle ordinary static variables and functions (in memory).
1454 Also handle vars declared register invalidly. */
1455 else if (name
[0] == '*')
1457 #ifdef REGISTER_PREFIX
1458 if (strlen (REGISTER_PREFIX
) != 0)
1460 reg_number
= decode_reg_name (name
);
1461 if (reg_number
>= 0 || reg_number
== -3)
1462 error ("register name given for non-register variable %q+D", decl
);
1467 /* Specifying a section attribute on a variable forces it into a
1468 non-.bss section, and thus it cannot be common. */
1469 /* FIXME: In general this code should not be necessary because
1470 visibility pass is doing the same work. But notice_global_symbol
1471 is called early and it needs to make DECL_RTL to get the name.
1472 we take care of recomputing the DECL_RTL after visibility is changed. */
1473 if (TREE_CODE (decl
) == VAR_DECL
1474 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
))
1475 && DECL_SECTION_NAME (decl
) != NULL
1476 && DECL_INITIAL (decl
) == NULL_TREE
1477 && DECL_COMMON (decl
))
1478 DECL_COMMON (decl
) = 0;
1480 /* Variables can't be both common and weak. */
1481 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1482 DECL_COMMON (decl
) = 0;
1484 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1485 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1488 machine_mode address_mode
= Pmode
;
1489 if (TREE_TYPE (decl
) != error_mark_node
)
1491 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1492 address_mode
= targetm
.addr_space
.address_mode (as
);
1494 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1496 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1497 SET_SYMBOL_REF_DECL (x
, decl
);
1499 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1500 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1501 set_mem_attributes (x
, decl
, 1);
1502 SET_DECL_RTL (decl
, x
);
1504 /* Optionally set flags or add text to the name to record information
1505 such as that it is a function name.
1506 If the name is changed, the macro ASM_OUTPUT_LABELREF
1507 will have to know how to strip this information. */
1508 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1511 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1512 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1516 make_decl_rtl_for_debug (tree decl
)
1518 unsigned int save_aliasing_flag
;
1521 if (DECL_RTL_SET_P (decl
))
1522 return DECL_RTL (decl
);
1524 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1525 call new_alias_set. If running with -fcompare-debug, sometimes
1526 we do not want to create alias sets that will throw the alias
1527 numbers off in the comparison dumps. So... clearing
1528 flag_strict_aliasing will keep new_alias_set() from creating a
1530 save_aliasing_flag
= flag_strict_aliasing
;
1531 flag_strict_aliasing
= 0;
1533 rtl
= DECL_RTL (decl
);
1534 /* Reset DECL_RTL back, as various parts of the compiler expects
1535 DECL_RTL set meaning it is actually going to be output. */
1536 SET_DECL_RTL (decl
, NULL
);
1538 flag_strict_aliasing
= save_aliasing_flag
;
1542 /* Output a string of literal assembler code
1543 for an `asm' keyword used between functions. */
1546 assemble_asm (tree string
)
1551 if (TREE_CODE (string
) == ADDR_EXPR
)
1552 string
= TREE_OPERAND (string
, 0);
1554 p
= TREE_STRING_POINTER (string
);
1555 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1558 /* Write the address of the entity given by SYMBOL to SEC. */
1560 assemble_addr_to_section (rtx symbol
, section
*sec
)
1562 switch_to_section (sec
);
1563 assemble_align (POINTER_SIZE
);
1564 assemble_integer (symbol
, POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
1567 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1568 not) section for PRIORITY. */
1570 get_cdtor_priority_section (int priority
, bool constructor_p
)
1574 /* ??? This only works reliably with the GNU linker. */
1575 sprintf (buf
, "%s.%.5u",
1576 constructor_p
? ".ctors" : ".dtors",
1577 /* Invert the numbering so the linker puts us in the proper
1578 order; constructors are run from right to left, and the
1579 linker sorts in increasing order. */
1580 MAX_INIT_PRIORITY
- priority
);
1581 return get_section (buf
, SECTION_WRITE
, NULL
);
1585 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1589 if (priority
!= DEFAULT_INIT_PRIORITY
)
1590 sec
= get_cdtor_priority_section (priority
,
1591 /*constructor_p=*/false);
1593 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1595 assemble_addr_to_section (symbol
, sec
);
1598 #ifdef DTORS_SECTION_ASM_OP
1600 default_dtor_section_asm_out_destructor (rtx symbol
,
1601 int priority ATTRIBUTE_UNUSED
)
1603 assemble_addr_to_section (symbol
, dtors_section
);
1608 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1612 if (priority
!= DEFAULT_INIT_PRIORITY
)
1613 sec
= get_cdtor_priority_section (priority
,
1614 /*constructor_p=*/true);
1616 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1618 assemble_addr_to_section (symbol
, sec
);
1621 #ifdef CTORS_SECTION_ASM_OP
1623 default_ctor_section_asm_out_constructor (rtx symbol
,
1624 int priority ATTRIBUTE_UNUSED
)
1626 assemble_addr_to_section (symbol
, ctors_section
);
1630 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1631 a nonzero value if the constant pool should be output before the
1632 start of the function, or a zero value if the pool should output
1633 after the end of the function. The default is to put it before the
1636 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1637 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1640 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1641 to be output to assembler.
1642 Set first_global_object_name and weak_global_object_name as appropriate. */
1645 notice_global_symbol (tree decl
)
1647 const char **t
= &first_global_object_name
;
1649 if (first_global_object_name
1650 || !TREE_PUBLIC (decl
)
1651 || DECL_EXTERNAL (decl
)
1652 || !DECL_NAME (decl
)
1653 || (TREE_CODE (decl
) == VAR_DECL
&& DECL_HARD_REGISTER (decl
))
1654 || (TREE_CODE (decl
) != FUNCTION_DECL
1655 && (TREE_CODE (decl
) != VAR_DECL
1656 || (DECL_COMMON (decl
)
1657 && (DECL_INITIAL (decl
) == 0
1658 || DECL_INITIAL (decl
) == error_mark_node
)))))
1661 /* We win when global object is found, but it is useful to know about weak
1662 symbol as well so we can produce nicer unique names. */
1663 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1664 t
= &weak_global_object_name
;
1668 tree id
= DECL_ASSEMBLER_NAME (decl
);
1669 ultimate_transparent_alias_target (&id
);
1670 *t
= ggc_strdup (targetm
.strip_name_encoding (IDENTIFIER_POINTER (id
)));
1674 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1675 current function goes into the cold section, so that targets can use
1676 current_function_section during RTL expansion. DECL describes the
1680 decide_function_section (tree decl
)
1682 first_function_block_is_cold
= false;
1684 if (flag_reorder_blocks_and_partition
)
1685 /* We will decide in assemble_start_function. */
1688 if (DECL_SECTION_NAME (decl
))
1690 struct cgraph_node
*node
= cgraph_node::get (current_function_decl
);
1691 /* Calls to function_section rely on first_function_block_is_cold
1693 first_function_block_is_cold
= (node
1695 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1698 in_cold_section_p
= first_function_block_is_cold
;
1701 /* Get the function's name, as described by its RTL. This may be
1702 different from the DECL_NAME name used in the source file. */
1704 get_fnname_from_decl (tree decl
)
1706 rtx x
= DECL_RTL (decl
);
1707 gcc_assert (MEM_P (x
));
1709 gcc_assert (GET_CODE (x
) == SYMBOL_REF
);
1713 /* Output assembler code for the constant pool of a function and associated
1714 with defining the name of the function. DECL describes the function.
1715 NAME is the function's name. For the constant pool, we use the current
1716 constant pool data. */
1719 assemble_start_function (tree decl
, const char *fnname
)
1722 char tmp_label
[100];
1723 bool hot_label_written
= false;
1725 if (flag_reorder_blocks_and_partition
)
1727 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1728 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1729 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1730 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1731 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1732 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1733 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1734 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1736 cold_function_name
= NULL_TREE
;
1740 crtl
->subsections
.hot_section_label
= NULL
;
1741 crtl
->subsections
.cold_section_label
= NULL
;
1742 crtl
->subsections
.hot_section_end_label
= NULL
;
1743 crtl
->subsections
.cold_section_end_label
= NULL
;
1746 /* The following code does not need preprocessing in the assembler. */
1750 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1751 output_constant_pool (fnname
, decl
);
1753 align
= symtab_node::get (decl
)->definition_alignment ();
1755 /* Make sure the not and cold text (code) sections are properly
1756 aligned. This is necessary here in the case where the function
1757 has both hot and cold sections, because we don't want to re-set
1758 the alignment when the section switch happens mid-function. */
1760 if (flag_reorder_blocks_and_partition
)
1762 first_function_block_is_cold
= false;
1764 switch_to_section (unlikely_text_section ());
1765 assemble_align (align
);
1766 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1768 /* When the function starts with a cold section, we need to explicitly
1769 align the hot section and write out the hot section label.
1770 But if the current function is a thunk, we do not have a CFG. */
1772 && BB_PARTITION (ENTRY_BLOCK_PTR_FOR_FN (cfun
)->next_bb
) == BB_COLD_PARTITION
)
1774 switch_to_section (text_section
);
1775 assemble_align (align
);
1776 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1777 hot_label_written
= true;
1778 first_function_block_is_cold
= true;
1780 in_cold_section_p
= first_function_block_is_cold
;
1784 /* Switch to the correct text section for the start of the function. */
1786 switch_to_section (function_section (decl
));
1787 if (flag_reorder_blocks_and_partition
1788 && !hot_label_written
)
1789 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1791 /* Tell assembler to move to target machine's alignment for functions. */
1792 align
= floor_log2 (align
/ BITS_PER_UNIT
);
1795 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1798 /* Handle a user-specified function alignment.
1799 Note that we still need to align to DECL_ALIGN, as above,
1800 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1801 if (! DECL_USER_ALIGN (decl
)
1802 && align_functions_log
> align
1803 && optimize_function_for_speed_p (cfun
))
1805 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1806 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1807 align_functions_log
, align_functions
- 1);
1809 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1813 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1814 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1817 if (!DECL_IGNORED_P (decl
))
1818 (*debug_hooks
->begin_function
) (decl
);
1820 /* Make function name accessible from other files, if appropriate. */
1822 if (TREE_PUBLIC (decl
)
1823 || (cgraph_node::get (decl
)->instrumentation_clone
1824 && cgraph_node::get (decl
)->instrumented_version
1825 && TREE_PUBLIC (cgraph_node::get (decl
)->instrumented_version
->decl
)))
1827 notice_global_symbol (decl
);
1829 globalize_decl (decl
);
1831 maybe_assemble_visibility (decl
);
1834 if (DECL_PRESERVE_P (decl
))
1835 targetm
.asm_out
.mark_decl_preserved (fnname
);
1837 /* Do any machine/system dependent processing of the function name. */
1838 #ifdef ASM_DECLARE_FUNCTION_NAME
1839 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1841 /* Standard thing is just output label for the function. */
1842 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1843 #endif /* ASM_DECLARE_FUNCTION_NAME */
1845 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1846 saw_no_split_stack
= true;
1849 /* Output assembler code associated with defining the size of the
1850 function. DECL describes the function. NAME is the function's name. */
1853 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1855 #ifdef ASM_DECLARE_FUNCTION_SIZE
1856 /* We could have switched section in the middle of the function. */
1857 if (flag_reorder_blocks_and_partition
)
1858 switch_to_section (function_section (decl
));
1859 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1861 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1863 output_constant_pool (fnname
, decl
);
1864 switch_to_section (function_section (decl
)); /* need to switch back */
1866 /* Output labels for end of hot/cold text sections (to be used by
1868 if (flag_reorder_blocks_and_partition
)
1870 section
*save_text_section
;
1872 save_text_section
= in_section
;
1873 switch_to_section (unlikely_text_section ());
1874 #ifdef ASM_DECLARE_COLD_FUNCTION_SIZE
1875 if (cold_function_name
!= NULL_TREE
)
1876 ASM_DECLARE_COLD_FUNCTION_SIZE (asm_out_file
,
1877 IDENTIFIER_POINTER (cold_function_name
),
1880 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1881 if (first_function_block_is_cold
)
1882 switch_to_section (text_section
);
1884 switch_to_section (function_section (decl
));
1885 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1886 switch_to_section (save_text_section
);
1890 /* Assemble code to leave SIZE bytes of zeros. */
1893 assemble_zeros (unsigned HOST_WIDE_INT size
)
1895 /* Do no output if -fsyntax-only. */
1896 if (flag_syntax_only
)
1899 #ifdef ASM_NO_SKIP_IN_TEXT
1900 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1901 so we must output 0s explicitly in the text section. */
1902 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1904 unsigned HOST_WIDE_INT i
;
1905 for (i
= 0; i
< size
; i
++)
1906 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1911 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1914 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1917 assemble_align (int align
)
1919 if (align
> BITS_PER_UNIT
)
1921 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1925 /* Assemble a string constant with the specified C string as contents. */
1928 assemble_string (const char *p
, int size
)
1933 /* If the string is very long, split it up. */
1937 int thissize
= size
- pos
;
1938 if (thissize
> maximum
)
1941 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1949 /* A noswitch_section_callback for lcomm_section. */
1952 emit_local (tree decl ATTRIBUTE_UNUSED
,
1953 const char *name ATTRIBUTE_UNUSED
,
1954 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1955 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1957 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1958 int align
= symtab_node::get (decl
)->definition_alignment ();
1959 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1962 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1963 int align
= symtab_node::get (decl
)->definition_alignment ();
1964 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, align
);
1967 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1972 /* A noswitch_section_callback for bss_noswitch_section. */
1974 #if defined ASM_OUTPUT_ALIGNED_BSS
1976 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1977 const char *name ATTRIBUTE_UNUSED
,
1978 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1979 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1981 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
,
1982 get_variable_align (decl
));
1987 /* A noswitch_section_callback for comm_section. */
1990 emit_common (tree decl ATTRIBUTE_UNUSED
,
1991 const char *name ATTRIBUTE_UNUSED
,
1992 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1993 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1995 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1996 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1997 size
, get_variable_align (decl
));
1999 #elif defined ASM_OUTPUT_ALIGNED_COMMON
2000 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
,
2001 get_variable_align (decl
));
2004 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
2009 /* A noswitch_section_callback for tls_comm_section. */
2012 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
2013 const char *name ATTRIBUTE_UNUSED
,
2014 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
2015 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2017 #ifdef ASM_OUTPUT_TLS_COMMON
2018 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
2021 sorry ("thread-local COMMON data not implemented");
2026 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
2027 NAME is the name of DECL's SYMBOL_REF. */
2030 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
,
2033 unsigned HOST_WIDE_INT size
, rounded
;
2035 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2038 if ((flag_sanitize
& SANITIZE_ADDRESS
) && asan_protect_global (decl
))
2039 size
+= asan_red_zone_size (size
);
2041 /* Don't allocate zero bytes of common,
2042 since that means "undefined external" in the linker. */
2046 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2047 so that each uninitialized object starts on such a boundary. */
2048 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
2049 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2050 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2052 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
2053 && (unsigned HOST_WIDE_INT
) (align
/ BITS_PER_UNIT
) > rounded
)
2054 error ("requested alignment for %q+D is greater than "
2055 "implemented alignment of %wu", decl
, rounded
);
2058 /* A subroutine of assemble_variable. Output the label and contents of
2059 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
2060 is as for assemble_variable. */
2063 assemble_variable_contents (tree decl
, const char *name
,
2064 bool dont_output_data
)
2066 /* Do any machine/system dependent processing of the object. */
2067 #ifdef ASM_DECLARE_OBJECT_NAME
2068 last_assemble_variable_decl
= decl
;
2069 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
2071 /* Standard thing is just output label for the object. */
2072 ASM_OUTPUT_LABEL (asm_out_file
, name
);
2073 #endif /* ASM_DECLARE_OBJECT_NAME */
2075 if (!dont_output_data
)
2077 /* Caller is supposed to use varpool_get_constructor when it wants
2078 to output the body. */
2079 gcc_assert (!in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
);
2080 if (DECL_INITIAL (decl
)
2081 && DECL_INITIAL (decl
) != error_mark_node
2082 && !initializer_zerop (DECL_INITIAL (decl
)))
2083 /* Output the actual data. */
2084 output_constant (DECL_INITIAL (decl
),
2085 tree_to_uhwi (DECL_SIZE_UNIT (decl
)),
2086 get_variable_align (decl
));
2088 /* Leave space for it. */
2089 assemble_zeros (tree_to_uhwi (DECL_SIZE_UNIT (decl
)));
2090 targetm
.asm_out
.decl_end ();
2094 /* Write out assembly for the variable DECL, which is not defined in
2095 the current translation unit. */
2097 assemble_undefined_decl (tree decl
)
2099 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
2100 targetm
.asm_out
.assemble_undefined_decl (asm_out_file
, name
, decl
);
2103 /* Assemble everything that is needed for a variable or function declaration.
2104 Not used for automatic variables, and not used for function definitions.
2105 Should not be called for variables of incomplete structure type.
2107 TOP_LEVEL is nonzero if this variable has file scope.
2108 AT_END is nonzero if this is the special handling, at end of compilation,
2109 to define things that have had only tentative definitions.
2110 DONT_OUTPUT_DATA if nonzero means don't actually output the
2111 initial value (that will be done by the caller). */
2114 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
2115 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
2118 rtx decl_rtl
, symbol
;
2121 bool asan_protected
= false;
2123 /* This function is supposed to handle VARIABLES. Ensure we have one. */
2124 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
2126 /* Emulated TLS had better not get this far. */
2127 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
2129 last_assemble_variable_decl
= 0;
2131 /* Normally no need to say anything here for external references,
2132 since assemble_external is called by the language-specific code
2133 when a declaration is first seen. */
2135 if (DECL_EXTERNAL (decl
))
2138 /* Do nothing for global register variables. */
2139 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
2141 TREE_ASM_WRITTEN (decl
) = 1;
2145 /* If type was incomplete when the variable was declared,
2146 see if it is complete now. */
2148 if (DECL_SIZE (decl
) == 0)
2149 layout_decl (decl
, 0);
2151 /* Still incomplete => don't allocate it; treat the tentative defn
2152 (which is what it must have been) as an `extern' reference. */
2154 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2156 error ("storage size of %q+D isn%'t known", decl
);
2157 TREE_ASM_WRITTEN (decl
) = 1;
2161 /* The first declaration of a variable that comes through this function
2162 decides whether it is global (in C, has external linkage)
2163 or local (in C, has internal linkage). So do nothing more
2164 if this function has already run. */
2166 if (TREE_ASM_WRITTEN (decl
))
2169 /* Make sure targetm.encode_section_info is invoked before we set
2171 decl_rtl
= DECL_RTL (decl
);
2173 TREE_ASM_WRITTEN (decl
) = 1;
2175 /* Do no output if -fsyntax-only. */
2176 if (flag_syntax_only
)
2179 if (! dont_output_data
2180 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
2182 error ("size of variable %q+D is too large", decl
);
2186 gcc_assert (MEM_P (decl_rtl
));
2187 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2188 symbol
= XEXP (decl_rtl
, 0);
2190 /* If this symbol belongs to the tree constant pool, output the constant
2191 if it hasn't already been written. */
2192 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
2194 tree decl
= SYMBOL_REF_DECL (symbol
);
2195 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
2196 output_constant_def_contents (symbol
);
2202 name
= XSTR (symbol
, 0);
2203 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2204 notice_global_symbol (decl
);
2206 /* Compute the alignment of this data. */
2208 align_variable (decl
, dont_output_data
);
2210 if ((flag_sanitize
& SANITIZE_ADDRESS
)
2211 && asan_protect_global (decl
))
2213 asan_protected
= true;
2214 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
2215 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
2218 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2220 align
= get_variable_align (decl
);
2222 if (TREE_PUBLIC (decl
))
2223 maybe_assemble_visibility (decl
);
2225 if (DECL_PRESERVE_P (decl
))
2226 targetm
.asm_out
.mark_decl_preserved (name
);
2228 /* First make the assembler name(s) global if appropriate. */
2229 sect
= get_variable_section (decl
, false);
2230 if (TREE_PUBLIC (decl
)
2231 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2232 globalize_decl (decl
);
2234 /* Output any data that we will need to use the address of. */
2235 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2236 output_addressed_constants (DECL_INITIAL (decl
));
2238 /* dbxout.c needs to know this. */
2239 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2240 DECL_IN_TEXT_SECTION (decl
) = 1;
2242 /* If the decl is part of an object_block, make sure that the decl
2243 has been positioned within its block, but do not write out its
2244 definition yet. output_object_blocks will do that later. */
2245 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2247 gcc_assert (!dont_output_data
);
2248 place_block_symbol (symbol
);
2250 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2251 assemble_noswitch_variable (decl
, name
, sect
, align
);
2254 /* The following bit of code ensures that vtable_map
2255 variables are not only in the comdat section, but that
2256 each variable has its own unique comdat name. If this
2257 code is removed, the variables end up in the same section
2258 with a single comdat name.
2260 FIXME: resolve_unique_section needs to deal better with
2261 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
2262 that is fixed, this if-else statement can be replaced with
2263 a single call to "switch_to_section (sect)". */
2264 if (sect
->named
.name
2265 && (strcmp (sect
->named
.name
, ".vtable_map_vars") == 0))
2267 #if defined (OBJECT_FORMAT_ELF)
2268 targetm
.asm_out
.named_section (sect
->named
.name
,
2269 sect
->named
.common
.flags
2273 #elif defined (TARGET_PECOFF)
2274 /* Neither OBJECT_FORMAT_PE, nor OBJECT_FORMAT_COFF is set here.
2275 Therefore the following check is used.
2276 In case a the target is PE or COFF a comdat group section
2277 is created, e.g. .vtable_map_vars$foo. The linker places
2278 everything in .vtable_map_vars at the end.
2280 A fix could be made in
2281 gcc/config/i386/winnt.c: i386_pe_unique_section. */
2286 if (TREE_CODE (DECL_NAME (decl
)) == IDENTIFIER_NODE
)
2287 name
= ACONCAT ((sect
->named
.name
, "$",
2288 IDENTIFIER_POINTER (DECL_NAME (decl
)), NULL
));
2290 name
= ACONCAT ((sect
->named
.name
, "$",
2291 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (DECL_NAME (decl
))),
2294 targetm
.asm_out
.named_section (name
,
2295 sect
->named
.common
.flags
2301 switch_to_section (sect
);
2305 switch_to_section (sect
);
2306 if (align
> BITS_PER_UNIT
)
2307 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
2308 assemble_variable_contents (decl
, name
, dont_output_data
);
2311 unsigned HOST_WIDE_INT
int size
2312 = tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2313 assemble_zeros (asan_red_zone_size (size
));
2319 /* Given a function declaration (FN_DECL), this function assembles the
2320 function into the .preinit_array section. */
2323 assemble_vtv_preinit_initializer (tree fn_decl
)
2326 unsigned flags
= SECTION_WRITE
;
2327 rtx symbol
= XEXP (DECL_RTL (fn_decl
), 0);
2329 flags
|= SECTION_NOTYPE
;
2330 sect
= get_section (".preinit_array", flags
, fn_decl
);
2331 switch_to_section (sect
);
2332 assemble_addr_to_section (symbol
, sect
);
2335 /* Return 1 if type TYPE contains any pointers. */
2338 contains_pointers_p (tree type
)
2340 switch (TREE_CODE (type
))
2343 case REFERENCE_TYPE
:
2344 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2345 so I'll play safe and return 1. */
2351 case QUAL_UNION_TYPE
:
2354 /* For a type that has fields, see if the fields have pointers. */
2355 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2356 if (TREE_CODE (fields
) == FIELD_DECL
2357 && contains_pointers_p (TREE_TYPE (fields
)))
2363 /* An array type contains pointers if its element type does. */
2364 return contains_pointers_p (TREE_TYPE (type
));
2371 /* We delay assemble_external processing until
2372 the compilation unit is finalized. This is the best we can do for
2373 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2374 it all the way to final. See PR 17982 for further discussion. */
2375 static GTY(()) tree pending_assemble_externals
;
2377 #ifdef ASM_OUTPUT_EXTERNAL
2378 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2379 As a result, assemble_external can be called after the list of externals
2380 is processed and the pointer set destroyed. */
2381 static bool pending_assemble_externals_processed
;
2383 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2384 TREE_LIST in assemble_external. */
2385 static hash_set
<tree
> *pending_assemble_externals_set
;
2387 /* True if DECL is a function decl for which no out-of-line copy exists.
2388 It is assumed that DECL's assembler name has been set. */
2391 incorporeal_function_p (tree decl
)
2393 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2397 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2398 && (DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
2399 || DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA_WITH_ALIGN
))
2402 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2403 /* Atomic or sync builtins which have survived this far will be
2404 resolved externally and therefore are not incorporeal. */
2405 if (strncmp (name
, "__builtin_", 10) == 0)
2411 /* Actually do the tests to determine if this is necessary, and invoke
2412 ASM_OUTPUT_EXTERNAL. */
2414 assemble_external_real (tree decl
)
2416 rtx rtl
= DECL_RTL (decl
);
2418 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2419 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2420 && !incorporeal_function_p (decl
))
2422 /* Some systems do require some output. */
2423 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2424 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2430 process_pending_assemble_externals (void)
2432 #ifdef ASM_OUTPUT_EXTERNAL
2434 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2435 assemble_external_real (TREE_VALUE (list
));
2437 pending_assemble_externals
= 0;
2438 pending_assemble_externals_processed
= true;
2439 delete pending_assemble_externals_set
;
2443 /* This TREE_LIST contains any weak symbol declarations waiting
2445 static GTY(()) tree weak_decls
;
2447 /* Output something to declare an external symbol to the assembler,
2448 and qualifiers such as weakness. (Most assemblers don't need
2449 extern declaration, so we normally output nothing.) Do nothing if
2450 DECL is not external. */
2453 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2455 /* Make sure that the ASM_OUT_FILE is open.
2456 If it's not, we should not be calling this function. */
2457 gcc_assert (asm_out_file
);
2459 /* In a perfect world, the following condition would be true.
2460 Sadly, the Java and Go front ends emit assembly *from the front end*,
2461 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2463 /* This function should only be called if we are expanding, or have
2465 Ideally, only final.c would be calling this function, but it is
2466 not clear whether that would break things somehow. See PR 17982
2467 for further discussion. */
2468 gcc_assert (state
== EXPANSION
2469 || state
== FINISHED
);
2472 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2475 /* We want to output annotation for weak and external symbols at
2476 very last to check if they are references or not. */
2478 if (TARGET_SUPPORTS_WEAK
2480 /* TREE_STATIC is a weird and abused creature which is not
2481 generally the right test for whether an entity has been
2482 locally emitted, inlined or otherwise not-really-extern, but
2483 for declarations that can be weak, it happens to be
2485 && !TREE_STATIC (decl
)
2486 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2487 && value_member (decl
, weak_decls
) == NULL_TREE
)
2488 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2490 #ifdef ASM_OUTPUT_EXTERNAL
2491 if (pending_assemble_externals_processed
)
2493 assemble_external_real (decl
);
2497 if (! pending_assemble_externals_set
->add (decl
))
2498 pending_assemble_externals
= tree_cons (NULL
, decl
,
2499 pending_assemble_externals
);
2503 /* Similar, for calling a library function FUN. */
2506 assemble_external_libcall (rtx fun
)
2508 /* Declare library function name external when first used, if nec. */
2509 if (! SYMBOL_REF_USED (fun
))
2511 SYMBOL_REF_USED (fun
) = 1;
2512 targetm
.asm_out
.external_libcall (fun
);
2516 /* Assemble a label named NAME. */
2519 assemble_label (FILE *file
, const char *name
)
2521 ASM_OUTPUT_LABEL (file
, name
);
2524 /* Set the symbol_referenced flag for ID. */
2526 mark_referenced (tree id
)
2528 TREE_SYMBOL_REFERENCED (id
) = 1;
2531 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2533 mark_decl_referenced (tree decl
)
2535 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2537 /* Extern inline functions don't become needed when referenced.
2538 If we know a method will be emitted in other TU and no new
2539 functions can be marked reachable, just use the external
2541 struct cgraph_node
*node
= cgraph_node::get_create (decl
);
2542 if (!DECL_EXTERNAL (decl
)
2543 && !node
->definition
)
2544 node
->mark_force_output ();
2546 else if (TREE_CODE (decl
) == VAR_DECL
)
2548 varpool_node
*node
= varpool_node::get_create (decl
);
2549 /* C++ frontend use mark_decl_references to force COMDAT variables
2550 to be output that might appear dead otherwise. */
2551 node
->force_output
= true;
2553 /* else do nothing - we can get various sorts of CST nodes here,
2554 which do not need to be marked. */
2558 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2559 starts with a *, the rest of NAME is output verbatim. Otherwise
2560 NAME is transformed in a target-specific way (usually by the
2561 addition of an underscore). */
2564 assemble_name_raw (FILE *file
, const char *name
)
2567 fputs (&name
[1], file
);
2569 ASM_OUTPUT_LABELREF (file
, name
);
2572 /* Like assemble_name_raw, but should be used when NAME might refer to
2573 an entity that is also represented as a tree (like a function or
2574 variable). If NAME does refer to such an entity, that entity will
2575 be marked as referenced. */
2578 assemble_name (FILE *file
, const char *name
)
2580 const char *real_name
;
2583 real_name
= targetm
.strip_name_encoding (name
);
2585 id
= maybe_get_identifier (real_name
);
2590 mark_referenced (id
);
2591 ultimate_transparent_alias_target (&id
);
2593 name
= IDENTIFIER_POINTER (id
);
2594 gcc_assert (! TREE_CHAIN (id
));
2597 assemble_name_raw (file
, name
);
2600 /* Allocate SIZE bytes writable static space with a gensym name
2601 and return an RTX to refer to its address. */
2604 assemble_static_space (unsigned HOST_WIDE_INT size
)
2607 const char *namestring
;
2610 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2612 namestring
= ggc_strdup (name
);
2614 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2615 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2617 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2618 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2621 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2622 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2625 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2626 so that each uninitialized object starts on such a boundary. */
2627 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2628 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2629 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2630 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2631 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2632 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2639 /* Assemble the static constant template for function entry trampolines.
2640 This is done at most once per compilation.
2641 Returns an RTX for the address of the template. */
2643 static GTY(()) rtx initial_trampoline
;
2646 assemble_trampoline_template (void)
2653 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2655 if (initial_trampoline
)
2656 return initial_trampoline
;
2658 /* By default, put trampoline templates in read-only data section. */
2660 #ifdef TRAMPOLINE_SECTION
2661 switch_to_section (TRAMPOLINE_SECTION
);
2663 switch_to_section (readonly_data_section
);
2666 /* Write the assembler code to define one. */
2667 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2669 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2671 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2672 targetm
.asm_out
.trampoline_template (asm_out_file
);
2674 /* Record the rtl to refer to it. */
2675 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2676 name
= ggc_strdup (label
);
2677 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2678 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2680 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2681 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2682 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2684 return initial_trampoline
;
2687 /* A and B are either alignments or offsets. Return the minimum alignment
2688 that may be assumed after adding the two together. */
2690 static inline unsigned
2691 min_align (unsigned int a
, unsigned int b
)
2693 return (a
| b
) & -(a
| b
);
2696 /* Return the assembler directive for creating a given kind of integer
2697 object. SIZE is the number of bytes in the object and ALIGNED_P
2698 indicates whether it is known to be aligned. Return NULL if the
2699 assembly dialect has no such directive.
2701 The returned string should be printed at the start of a new line and
2702 be followed immediately by the object's initial value. */
2705 integer_asm_op (int size
, int aligned_p
)
2707 struct asm_int_op
*ops
;
2710 ops
= &targetm
.asm_out
.aligned_op
;
2712 ops
= &targetm
.asm_out
.unaligned_op
;
2717 return targetm
.asm_out
.byte_op
;
2731 /* Use directive OP to assemble an integer object X. Print OP at the
2732 start of the line, followed immediately by the value of X. */
2735 assemble_integer_with_op (const char *op
, rtx x
)
2737 fputs (op
, asm_out_file
);
2738 output_addr_const (asm_out_file
, x
);
2739 fputc ('\n', asm_out_file
);
2742 /* The default implementation of the asm_out.integer target hook. */
2745 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2746 unsigned int size ATTRIBUTE_UNUSED
,
2747 int aligned_p ATTRIBUTE_UNUSED
)
2749 const char *op
= integer_asm_op (size
, aligned_p
);
2750 /* Avoid GAS bugs for large values. Specifically negative values whose
2751 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2752 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE_UNITS
)
2754 return op
&& (assemble_integer_with_op (op
, x
), true);
2757 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2758 the alignment of the integer in bits. Return 1 if we were able to output
2759 the constant, otherwise 0. We must be able to output the constant,
2760 if FORCE is nonzero. */
2763 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2767 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2769 /* See if the target hook can handle this kind of object. */
2770 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2773 /* If the object is a multi-byte one, try splitting it up. Split
2774 it into words it if is multi-word, otherwise split it into bytes. */
2777 machine_mode omode
, imode
;
2778 unsigned int subalign
;
2779 unsigned int subsize
, i
;
2780 enum mode_class mclass
;
2782 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2783 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2784 if (GET_CODE (x
) == CONST_FIXED
)
2785 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2789 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2790 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2792 for (i
= 0; i
< size
; i
+= subsize
)
2794 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2795 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2801 /* If we've printed some of it, but not all of it, there's no going
2806 gcc_assert (!force
);
2812 assemble_real (REAL_VALUE_TYPE d
, machine_mode mode
, unsigned int align
)
2814 long data
[4] = {0, 0, 0, 0};
2816 int bitsize
, nelts
, nunits
, units_per
;
2818 /* This is hairy. We have a quantity of known size. real_to_target
2819 will put it into an array of *host* longs, 32 bits per element
2820 (even if long is more than 32 bits). We need to determine the
2821 number of array elements that are occupied (nelts) and the number
2822 of *target* min-addressable units that will be occupied in the
2823 object file (nunits). We cannot assume that 32 divides the
2824 mode's bitsize (size * BITS_PER_UNIT) evenly.
2826 size * BITS_PER_UNIT is used here to make sure that padding bits
2827 (which might appear at either end of the value; real_to_target
2828 will include the padding bits in its output array) are included. */
2830 nunits
= GET_MODE_SIZE (mode
);
2831 bitsize
= nunits
* BITS_PER_UNIT
;
2832 nelts
= CEIL (bitsize
, 32);
2833 units_per
= 32 / BITS_PER_UNIT
;
2835 real_to_target (data
, &d
, mode
);
2837 /* Put out the first word with the specified alignment. */
2838 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2839 nunits
-= units_per
;
2841 /* Subsequent words need only 32-bit alignment. */
2842 align
= min_align (align
, 32);
2844 for (i
= 1; i
< nelts
; i
++)
2846 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2847 nunits
-= units_per
;
2851 /* Given an expression EXP with a constant value,
2852 reduce it to the sum of an assembler symbol and an integer.
2853 Store them both in the structure *VALUE.
2854 EXP must be reducible. */
2858 HOST_WIDE_INT offset
;
2862 decode_addr_const (tree exp
, struct addr_const
*value
)
2864 tree target
= TREE_OPERAND (exp
, 0);
2870 if (TREE_CODE (target
) == COMPONENT_REF
2871 && tree_fits_shwi_p (byte_position (TREE_OPERAND (target
, 1))))
2873 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2874 target
= TREE_OPERAND (target
, 0);
2876 else if (TREE_CODE (target
) == ARRAY_REF
2877 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2879 offset
+= (tree_to_uhwi (TYPE_SIZE_UNIT (TREE_TYPE (target
)))
2880 * tree_to_shwi (TREE_OPERAND (target
, 1)));
2881 target
= TREE_OPERAND (target
, 0);
2883 else if (TREE_CODE (target
) == MEM_REF
2884 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2886 offset
+= mem_ref_offset (target
).to_short_addr ();
2887 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2889 else if (TREE_CODE (target
) == INDIRECT_REF
2890 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2891 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2893 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2898 switch (TREE_CODE (target
))
2902 x
= DECL_RTL (target
);
2906 x
= gen_rtx_MEM (FUNCTION_MODE
,
2907 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2916 x
= output_constant_def (target
, 1);
2923 gcc_assert (MEM_P (x
));
2927 value
->offset
= offset
;
2930 static GTY(()) hash_table
<tree_descriptor_hasher
> *const_desc_htab
;
2932 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2934 /* Constant pool accessor function. */
2936 hash_table
<tree_descriptor_hasher
> *
2937 constant_pool_htab (void)
2939 return const_desc_htab
;
2942 /* Compute a hash code for a constant expression. */
2945 tree_descriptor_hasher::hash (constant_descriptor_tree
*ptr
)
2951 const_hash_1 (const tree exp
)
2956 enum tree_code code
= TREE_CODE (exp
);
2958 /* Either set P and LEN to the address and len of something to hash and
2959 exit the switch or return a value. */
2964 p
= (char *) &TREE_INT_CST_ELT (exp
, 0);
2965 len
= TREE_INT_CST_NUNITS (exp
) * sizeof (HOST_WIDE_INT
);
2969 return real_hash (TREE_REAL_CST_PTR (exp
));
2972 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2975 p
= TREE_STRING_POINTER (exp
);
2976 len
= TREE_STRING_LENGTH (exp
);
2980 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2981 + const_hash_1 (TREE_IMAGPART (exp
)));
2987 hi
= 7 + VECTOR_CST_NELTS (exp
);
2989 for (i
= 0; i
< VECTOR_CST_NELTS (exp
); ++i
)
2990 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ELT (exp
, i
));
2997 unsigned HOST_WIDE_INT idx
;
3000 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
3002 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
3004 hi
= hi
* 603 + const_hash_1 (value
);
3012 struct addr_const value
;
3014 decode_addr_const (exp
, &value
);
3015 switch (GET_CODE (value
.base
))
3018 /* Don't hash the address of the SYMBOL_REF;
3019 only use the offset and the symbol name. */
3021 p
= XSTR (value
.base
, 0);
3022 for (i
= 0; p
[i
] != 0; i
++)
3023 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3028 + CODE_LABEL_NUMBER (LABEL_REF_LABEL (value
.base
)) * 13);
3038 case POINTER_PLUS_EXPR
:
3040 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
3041 + const_hash_1 (TREE_OPERAND (exp
, 1)));
3044 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
3047 /* A language specific constant. Just hash the code. */
3051 /* Compute hashing function. */
3053 for (i
= 0; i
< len
; i
++)
3054 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3059 /* Wrapper of compare_constant, for the htab interface. */
3061 tree_descriptor_hasher::equal (constant_descriptor_tree
*c1
,
3062 constant_descriptor_tree
*c2
)
3064 if (c1
->hash
!= c2
->hash
)
3066 return compare_constant (c1
->value
, c2
->value
);
3069 /* Compare t1 and t2, and return 1 only if they are known to result in
3070 the same bit pattern on output. */
3073 compare_constant (const tree t1
, const tree t2
)
3075 enum tree_code typecode
;
3077 if (t1
== NULL_TREE
)
3078 return t2
== NULL_TREE
;
3079 if (t2
== NULL_TREE
)
3082 if (TREE_CODE (t1
) != TREE_CODE (t2
))
3085 switch (TREE_CODE (t1
))
3088 /* Integer constants are the same only if the same width of type. */
3089 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3091 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3093 return tree_int_cst_equal (t1
, t2
);
3096 /* Real constants are the same only if the same width of type. */
3097 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3100 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
3103 /* Fixed constants are the same only if the same width of type. */
3104 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3107 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
3110 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3113 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
3114 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
3115 TREE_STRING_LENGTH (t1
)));
3118 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
3119 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
3125 if (VECTOR_CST_NELTS (t1
) != VECTOR_CST_NELTS (t2
))
3128 for (i
= 0; i
< VECTOR_CST_NELTS (t1
); ++i
)
3129 if (!compare_constant (VECTOR_CST_ELT (t1
, i
),
3130 VECTOR_CST_ELT (t2
, i
)))
3138 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
3139 unsigned HOST_WIDE_INT idx
;
3141 typecode
= TREE_CODE (TREE_TYPE (t1
));
3142 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
3145 if (typecode
== ARRAY_TYPE
)
3147 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
3148 /* For arrays, check that the sizes all match. */
3149 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
3151 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
3156 /* For record and union constructors, require exact type
3158 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
3162 v1
= CONSTRUCTOR_ELTS (t1
);
3163 v2
= CONSTRUCTOR_ELTS (t2
);
3164 if (vec_safe_length (v1
) != vec_safe_length (v2
))
3167 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
3169 constructor_elt
*c1
= &(*v1
)[idx
];
3170 constructor_elt
*c2
= &(*v2
)[idx
];
3172 /* Check that each value is the same... */
3173 if (!compare_constant (c1
->value
, c2
->value
))
3175 /* ... and that they apply to the same fields! */
3176 if (typecode
== ARRAY_TYPE
)
3178 if (!compare_constant (c1
->index
, c2
->index
))
3183 if (c1
->index
!= c2
->index
)
3194 struct addr_const value1
, value2
;
3198 decode_addr_const (t1
, &value1
);
3199 decode_addr_const (t2
, &value2
);
3201 if (value1
.offset
!= value2
.offset
)
3204 code
= GET_CODE (value1
.base
);
3205 if (code
!= GET_CODE (value2
.base
))
3211 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3215 ret
= (CODE_LABEL_NUMBER (LABEL_REF_LABEL (value1
.base
))
3216 == CODE_LABEL_NUMBER (LABEL_REF_LABEL (value2
.base
)));
3226 case POINTER_PLUS_EXPR
:
3229 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3230 && compare_constant (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3233 case VIEW_CONVERT_EXPR
:
3234 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3243 /* Return the section into which constant EXP should be placed. */
3246 get_constant_section (tree exp
, unsigned int align
)
3248 return targetm
.asm_out
.select_section (exp
,
3249 compute_reloc_for_constant (exp
),
3253 /* Return the size of constant EXP in bytes. */
3255 static HOST_WIDE_INT
3256 get_constant_size (tree exp
)
3260 size
= int_size_in_bytes (TREE_TYPE (exp
));
3261 if (TREE_CODE (exp
) == STRING_CST
)
3262 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3266 /* Subroutine of output_constant_def:
3267 No constant equal to EXP is known to have been output.
3268 Make a constant descriptor to enter EXP in the hash table.
3269 Assign the label number and construct RTL to refer to the
3270 constant's location in memory.
3271 Caller is responsible for updating the hash table. */
3273 static struct constant_descriptor_tree
*
3274 build_constant_desc (tree exp
)
3276 struct constant_descriptor_tree
*desc
;
3282 desc
= ggc_alloc
<constant_descriptor_tree
> ();
3285 /* Create a string containing the label name, in LABEL. */
3286 labelno
= const_labelno
++;
3287 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3289 /* Construct the VAR_DECL associated with the constant. */
3290 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3292 DECL_ARTIFICIAL (decl
) = 1;
3293 DECL_IGNORED_P (decl
) = 1;
3294 TREE_READONLY (decl
) = 1;
3295 TREE_STATIC (decl
) = 1;
3296 TREE_ADDRESSABLE (decl
) = 1;
3297 /* We don't set the RTL yet as this would cause varpool to assume that the
3298 variable is referenced. Moreover, it would just be dropped in LTO mode.
3299 Instead we set the flag that will be recognized in make_decl_rtl. */
3300 DECL_IN_CONSTANT_POOL (decl
) = 1;
3301 DECL_INITIAL (decl
) = desc
->value
;
3302 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3303 architectures so use DATA_ALIGNMENT as well, except for strings. */
3304 if (TREE_CODE (exp
) == STRING_CST
)
3306 #ifdef CONSTANT_ALIGNMENT
3307 DECL_ALIGN (decl
) = CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
));
3311 align_variable (decl
, 0);
3313 /* Now construct the SYMBOL_REF and the MEM. */
3314 if (use_object_blocks_p ())
3316 int align
= (TREE_CODE (decl
) == CONST_DECL
3317 || (TREE_CODE (decl
) == VAR_DECL
3318 && DECL_IN_CONSTANT_POOL (decl
))
3320 : symtab_node::get (decl
)->definition_alignment ());
3321 section
*sect
= get_constant_section (exp
, align
);
3322 symbol
= create_block_symbol (ggc_strdup (label
),
3323 get_block_for_section (sect
), -1);
3326 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3327 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3328 SET_SYMBOL_REF_DECL (symbol
, decl
);
3329 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3331 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3332 set_mem_attributes (rtl
, exp
, 1);
3333 set_mem_alias_set (rtl
, 0);
3335 /* We cannot share RTX'es in pool entries.
3336 Mark this piece of RTL as required for unsharing. */
3337 RTX_FLAG (rtl
, used
) = 1;
3339 /* Set flags or add text to the name to record information, such as
3340 that it is a local symbol. If the name is changed, the macro
3341 ASM_OUTPUT_LABELREF will have to know how to strip this
3342 information. This call might invalidate our local variable
3343 SYMBOL; we can't use it afterward. */
3344 targetm
.encode_section_info (exp
, rtl
, true);
3351 /* Return an rtx representing a reference to constant data in memory
3352 for the constant expression EXP.
3354 If assembler code for such a constant has already been output,
3355 return an rtx to refer to it.
3356 Otherwise, output such a constant in memory
3357 and generate an rtx for it.
3359 If DEFER is nonzero, this constant can be deferred and output only
3360 if referenced in the function after all optimizations.
3362 `const_desc_table' records which constants already have label strings. */
3365 output_constant_def (tree exp
, int defer
)
3367 struct constant_descriptor_tree
*desc
;
3368 struct constant_descriptor_tree key
;
3370 /* Look up EXP in the table of constant descriptors. If we didn't find
3371 it, create a new one. */
3373 key
.hash
= const_hash_1 (exp
);
3374 constant_descriptor_tree
**loc
3375 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3380 desc
= build_constant_desc (exp
);
3381 desc
->hash
= key
.hash
;
3385 maybe_output_constant_def_contents (desc
, defer
);
3389 /* Subroutine of output_constant_def: Decide whether or not we need to
3390 output the constant DESC now, and if so, do it. */
3392 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3395 rtx symbol
= XEXP (desc
->rtl
, 0);
3396 tree exp
= desc
->value
;
3398 if (flag_syntax_only
)
3401 if (TREE_ASM_WRITTEN (exp
))
3402 /* Already output; don't do it again. */
3405 /* We can always defer constants as long as the context allows
3409 /* Increment n_deferred_constants if it exists. It needs to be at
3410 least as large as the number of constants actually referred to
3411 by the function. If it's too small we'll stop looking too early
3412 and fail to emit constants; if it's too large we'll only look
3413 through the entire function when we could have stopped earlier. */
3415 n_deferred_constants
++;
3419 output_constant_def_contents (symbol
);
3422 /* Subroutine of output_constant_def_contents. Output the definition
3423 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3424 constant's alignment in bits. */
3427 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3431 size
= get_constant_size (exp
);
3433 /* Do any machine/system dependent processing of the constant. */
3434 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3436 /* Output the value of EXP. */
3437 output_constant (exp
, size
, align
);
3439 targetm
.asm_out
.decl_end ();
3442 /* We must output the constant data referred to by SYMBOL; do so. */
3445 output_constant_def_contents (rtx symbol
)
3447 tree decl
= SYMBOL_REF_DECL (symbol
);
3448 tree exp
= DECL_INITIAL (decl
);
3449 bool asan_protected
= false;
3451 /* Make sure any other constants whose addresses appear in EXP
3452 are assigned label numbers. */
3453 output_addressed_constants (exp
);
3455 /* We are no longer deferring this constant. */
3456 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3458 if ((flag_sanitize
& SANITIZE_ADDRESS
)
3459 && TREE_CODE (exp
) == STRING_CST
3460 && asan_protect_global (exp
))
3462 asan_protected
= true;
3463 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
3464 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
3467 /* If the constant is part of an object block, make sure that the
3468 decl has been positioned within its block, but do not write out
3469 its definition yet. output_object_blocks will do that later. */
3470 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3471 place_block_symbol (symbol
);
3474 int align
= (TREE_CODE (decl
) == CONST_DECL
3475 || (TREE_CODE (decl
) == VAR_DECL
3476 && DECL_IN_CONSTANT_POOL (decl
))
3478 : symtab_node::get (decl
)->definition_alignment ());
3479 switch_to_section (get_constant_section (exp
, align
));
3480 if (align
> BITS_PER_UNIT
)
3481 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3482 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3485 HOST_WIDE_INT size
= get_constant_size (exp
);
3486 assemble_zeros (asan_red_zone_size (size
));
3491 /* Look up EXP in the table of constant descriptors. Return the rtl
3492 if it has been emitted, else null. */
3495 lookup_constant_def (tree exp
)
3497 struct constant_descriptor_tree key
;
3500 key
.hash
= const_hash_1 (exp
);
3501 constant_descriptor_tree
*desc
3502 = const_desc_htab
->find_with_hash (&key
, key
.hash
);
3504 return (desc
? desc
->rtl
: NULL_RTX
);
3507 /* Return a tree representing a reference to constant data in memory
3508 for the constant expression EXP.
3510 This is the counterpart of output_constant_def at the Tree level. */
3513 tree_output_constant_def (tree exp
)
3515 struct constant_descriptor_tree
*desc
, key
;
3518 /* Look up EXP in the table of constant descriptors. If we didn't find
3519 it, create a new one. */
3521 key
.hash
= const_hash_1 (exp
);
3522 constant_descriptor_tree
**loc
3523 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3528 desc
= build_constant_desc (exp
);
3529 desc
->hash
= key
.hash
;
3533 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3534 varpool_node::finalize_decl (decl
);
3538 struct GTY((chain_next ("%h.next"), for_user
)) constant_descriptor_rtx
{
3539 struct constant_descriptor_rtx
*next
;
3543 HOST_WIDE_INT offset
;
3551 struct const_rtx_desc_hasher
: ggc_hasher
<constant_descriptor_rtx
*>
3553 static hashval_t
hash (constant_descriptor_rtx
*);
3554 static bool equal (constant_descriptor_rtx
*, constant_descriptor_rtx
*);
3557 /* Used in the hash tables to avoid outputting the same constant
3558 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3559 are output once per function, not once per file. */
3560 /* ??? Only a few targets need per-function constant pools. Most
3561 can use one per-file pool. Should add a targetm bit to tell the
3564 struct GTY(()) rtx_constant_pool
{
3565 /* Pointers to first and last constant in pool, as ordered by offset. */
3566 struct constant_descriptor_rtx
*first
;
3567 struct constant_descriptor_rtx
*last
;
3569 /* Hash facility for making memory-constants from constant rtl-expressions.
3570 It is used on RISC machines where immediate integer arguments and
3571 constant addresses are restricted so that such constants must be stored
3573 hash_table
<const_rtx_desc_hasher
> *const_rtx_htab
;
3575 /* Current offset in constant pool (does not include any
3576 machine-specific header). */
3577 HOST_WIDE_INT offset
;
3580 /* Hash and compare functions for const_rtx_htab. */
3583 const_rtx_desc_hasher::hash (constant_descriptor_rtx
*desc
)
3589 const_rtx_desc_hasher::equal (constant_descriptor_rtx
*x
,
3590 constant_descriptor_rtx
*y
)
3592 if (x
->mode
!= y
->mode
)
3594 return rtx_equal_p (x
->constant
, y
->constant
);
3597 /* Hash one component of a constant. */
3600 const_rtx_hash_1 (const_rtx x
)
3602 unsigned HOST_WIDE_INT hwi
;
3608 code
= GET_CODE (x
);
3609 mode
= GET_MODE (x
);
3610 h
= (hashval_t
) code
* 1048573 + mode
;
3619 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3620 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3622 h
^= (hashval_t
) hwi
;
3623 for (i
= 1; i
< n
; ++i
)
3626 h
^= (hashval_t
) hwi
;
3631 case CONST_WIDE_INT
:
3632 hwi
= GET_MODE_PRECISION (mode
);
3634 for (i
= 0; i
< CONST_WIDE_INT_NUNITS (x
); i
++)
3635 hwi
^= CONST_WIDE_INT_ELT (x
, i
);
3640 if (TARGET_SUPPORTS_WIDE_INT
== 0 && mode
== VOIDmode
)
3642 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3646 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3650 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3654 h
^= htab_hash_string (XSTR (x
, 0));
3658 h
= h
* 251 + CODE_LABEL_NUMBER (LABEL_REF_LABEL (x
));
3662 case UNSPEC_VOLATILE
:
3663 h
= h
* 251 + XINT (x
, 1);
3673 /* Compute a hash value for X, which should be a constant. */
3676 const_rtx_hash (rtx x
)
3679 subrtx_iterator::array_type array
;
3680 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
3681 h
= h
* 509 + const_rtx_hash_1 (*iter
);
3686 /* Create and return a new rtx constant pool. */
3688 static struct rtx_constant_pool
*
3689 create_constant_pool (void)
3691 struct rtx_constant_pool
*pool
;
3693 pool
= ggc_alloc
<rtx_constant_pool
> ();
3694 pool
->const_rtx_htab
= hash_table
<const_rtx_desc_hasher
>::create_ggc (31);
3701 /* Initialize constant pool hashing for a new function. */
3704 init_varasm_status (void)
3706 crtl
->varasm
.pool
= create_constant_pool ();
3707 crtl
->varasm
.deferred_constants
= 0;
3710 /* Given a MINUS expression, simplify it if both sides
3711 include the same symbol. */
3714 simplify_subtraction (rtx x
)
3716 rtx r
= simplify_rtx (x
);
3720 /* Given a constant rtx X, make (or find) a memory constant for its value
3721 and return a MEM rtx to refer to it in memory. */
3724 force_const_mem (machine_mode mode
, rtx x
)
3726 struct constant_descriptor_rtx
*desc
, tmp
;
3727 struct rtx_constant_pool
*pool
;
3732 constant_descriptor_rtx
**slot
;
3734 /* If we're not allowed to drop X into the constant pool, don't. */
3735 if (targetm
.cannot_force_const_mem (mode
, x
))
3738 /* Record that this function has used a constant pool entry. */
3739 crtl
->uses_const_pool
= 1;
3741 /* Decide which pool to use. */
3742 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3743 ? shared_constant_pool
3744 : crtl
->varasm
.pool
);
3746 /* Lookup the value in the hashtable. */
3749 hash
= const_rtx_hash (x
);
3750 slot
= pool
->const_rtx_htab
->find_slot_with_hash (&tmp
, hash
, INSERT
);
3753 /* If the constant was already present, return its memory. */
3755 return copy_rtx (desc
->mem
);
3757 /* Otherwise, create a new descriptor. */
3758 desc
= ggc_alloc
<constant_descriptor_rtx
> ();
3761 /* Align the location counter as required by EXP's data type. */
3762 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3763 #ifdef CONSTANT_ALIGNMENT
3765 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3766 if (type
!= NULL_TREE
)
3767 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3771 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3772 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3775 desc
->constant
= copy_rtx (tmp
.constant
);
3776 desc
->offset
= pool
->offset
;
3779 desc
->align
= align
;
3780 desc
->labelno
= const_labelno
;
3783 pool
->offset
+= GET_MODE_SIZE (mode
);
3785 pool
->last
->next
= desc
;
3787 pool
->first
= pool
->last
= desc
;
3790 /* Create a string containing the label name, in LABEL. */
3791 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3794 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3795 the constants pool. */
3796 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3798 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3799 symbol
= create_block_symbol (ggc_strdup (label
),
3800 get_block_for_section (sect
), -1);
3803 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3805 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3806 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3807 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3809 /* Construct the MEM. */
3810 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3811 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3812 set_mem_align (def
, align
);
3814 /* If we're dropping a label to the constant pool, make sure we
3816 if (GET_CODE (x
) == LABEL_REF
)
3817 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3819 return copy_rtx (def
);
3822 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3825 get_pool_constant (const_rtx addr
)
3827 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3830 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3831 and whether it has been output or not. */
3834 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3836 struct constant_descriptor_rtx
*desc
;
3838 desc
= SYMBOL_REF_CONSTANT (addr
);
3839 *pmarked
= (desc
->mark
!= 0);
3840 return desc
->constant
;
3843 /* Similar, return the mode. */
3846 get_pool_mode (const_rtx addr
)
3848 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3851 /* Return the size of the constant pool. */
3854 get_pool_size (void)
3856 return crtl
->varasm
.pool
->offset
;
3859 /* Worker function for output_constant_pool_1. Emit assembly for X
3860 in MODE with known alignment ALIGN. */
3863 output_constant_pool_2 (machine_mode mode
, rtx x
, unsigned int align
)
3865 switch (GET_MODE_CLASS (mode
))
3868 case MODE_DECIMAL_FLOAT
:
3872 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3873 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3874 assemble_real (r
, mode
, align
);
3879 case MODE_PARTIAL_INT
:
3884 case MODE_POINTER_BOUNDS
:
3885 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3888 case MODE_VECTOR_FLOAT
:
3889 case MODE_VECTOR_INT
:
3890 case MODE_VECTOR_FRACT
:
3891 case MODE_VECTOR_UFRACT
:
3892 case MODE_VECTOR_ACCUM
:
3893 case MODE_VECTOR_UACCUM
:
3896 machine_mode submode
= GET_MODE_INNER (mode
);
3897 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3899 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3900 units
= CONST_VECTOR_NUNITS (x
);
3902 for (i
= 0; i
< units
; i
++)
3904 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3905 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3915 /* Worker function for output_constant_pool. Emit constant DESC,
3916 giving it ALIGN bits of alignment. */
3919 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3926 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3927 whose CODE_LABEL has been deleted. This can occur if a jump table
3928 is eliminated by optimization. If so, write a constant of zero
3929 instead. Note that this can also happen by turning the
3930 CODE_LABEL into a NOTE. */
3931 /* ??? This seems completely and utterly wrong. Certainly it's
3932 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3933 functioning even with rtx_insn::deleted and friends. */
3936 switch (GET_CODE (tmp
))
3939 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3940 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3942 tmp
= XEXP (XEXP (tmp
, 0), 0);
3946 tmp
= LABEL_REF_LABEL (tmp
);
3947 gcc_assert (!as_a
<rtx_insn
*> (tmp
)->deleted ());
3948 gcc_assert (!NOTE_P (tmp
)
3949 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3956 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3957 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3958 align
, desc
->labelno
, done
);
3961 assemble_align (align
);
3963 /* Output the label. */
3964 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3967 Pass actual alignment value while emitting string constant to asm code
3968 as function 'output_constant_pool_1' explicitly passes the alignment as 1
3969 assuming that the data is already aligned which prevents the generation
3970 of fix-up table entries. */
3971 output_constant_pool_2 (desc
->mode
, x
, desc
->align
);
3973 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3974 sections have proper size. */
3975 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3977 && (in_section
->common
.flags
& SECTION_MERGE
))
3978 assemble_align (align
);
3980 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3986 /* Mark all constants that are referenced by SYMBOL_REFs in X.
3987 Emit referenced deferred strings. */
3990 mark_constants_in_pattern (rtx insn
)
3992 subrtx_iterator::array_type array
;
3993 FOR_EACH_SUBRTX (iter
, array
, PATTERN (insn
), ALL
)
3995 const_rtx x
= *iter
;
3996 if (GET_CODE (x
) == SYMBOL_REF
)
3998 if (CONSTANT_POOL_ADDRESS_P (x
))
4000 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
4001 if (desc
->mark
== 0)
4004 iter
.substitute (desc
->constant
);
4007 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
4009 tree decl
= SYMBOL_REF_DECL (x
);
4010 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
4012 n_deferred_constants
--;
4013 output_constant_def_contents (CONST_CAST_RTX (x
));
4020 /* Look through appropriate parts of INSN, marking all entries in the
4021 constant pool which are actually being used. Entries that are only
4022 referenced by other constants are also marked as used. Emit
4023 deferred strings that are used. */
4026 mark_constants (rtx_insn
*insn
)
4031 /* Insns may appear inside a SEQUENCE. Only check the patterns of
4032 insns, not any notes that may be attached. We don't want to mark
4033 a constant just because it happens to appear in a REG_EQUIV note. */
4034 if (rtx_sequence
*seq
= dyn_cast
<rtx_sequence
*> (PATTERN (insn
)))
4036 int i
, n
= seq
->len ();
4037 for (i
= 0; i
< n
; ++i
)
4039 rtx subinsn
= seq
->element (i
);
4040 if (INSN_P (subinsn
))
4041 mark_constants_in_pattern (subinsn
);
4045 mark_constants_in_pattern (insn
);
4048 /* Look through the instructions for this function, and mark all the
4049 entries in POOL which are actually being used. Emit deferred constants
4050 which have indeed been used. */
4053 mark_constant_pool (void)
4057 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
4060 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
4061 mark_constants (insn
);
4064 /* Write all the constants in POOL. */
4067 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
4069 struct constant_descriptor_rtx
*desc
;
4071 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
4074 /* If the constant is part of an object_block, make sure that
4075 the constant has been positioned within its block, but do not
4076 write out its definition yet. output_object_blocks will do
4078 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
4079 && SYMBOL_REF_BLOCK (desc
->sym
))
4080 place_block_symbol (desc
->sym
);
4083 switch_to_section (targetm
.asm_out
.select_rtx_section
4084 (desc
->mode
, desc
->constant
, desc
->align
));
4085 output_constant_pool_1 (desc
, desc
->align
);
4090 /* Mark all constants that are used in the current function, then write
4091 out the function's private constant pool. */
4094 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
4095 tree fndecl ATTRIBUTE_UNUSED
)
4097 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
4099 /* It is possible for gcc to call force_const_mem and then to later
4100 discard the instructions which refer to the constant. In such a
4101 case we do not need to output the constant. */
4102 mark_constant_pool ();
4104 #ifdef ASM_OUTPUT_POOL_PROLOGUE
4105 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4108 output_constant_pool_contents (pool
);
4110 #ifdef ASM_OUTPUT_POOL_EPILOGUE
4111 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4115 /* Write the contents of the shared constant pool. */
4118 output_shared_constant_pool (void)
4120 output_constant_pool_contents (shared_constant_pool
);
4123 /* Determine what kind of relocations EXP may need. */
4126 compute_reloc_for_constant (tree exp
)
4128 int reloc
= 0, reloc2
;
4131 switch (TREE_CODE (exp
))
4135 /* Go inside any operations that get_inner_reference can handle and see
4136 if what's inside is a constant: no need to do anything here for
4137 addresses of variables or functions. */
4138 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4139 tem
= TREE_OPERAND (tem
, 0))
4142 if (TREE_CODE (tem
) == MEM_REF
4143 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
4145 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
4149 if (!targetm
.binds_local_p (tem
))
4156 case POINTER_PLUS_EXPR
:
4157 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4158 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4162 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4163 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4164 /* The difference of two local labels is computable at link time. */
4165 if (reloc
== 1 && reloc2
== 1)
4172 case VIEW_CONVERT_EXPR
:
4173 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4178 unsigned HOST_WIDE_INT idx
;
4179 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4181 reloc
|= compute_reloc_for_constant (tem
);
4191 /* Find all the constants whose addresses are referenced inside of EXP,
4192 and make sure assembler code with a label has been output for each one.
4193 Indicate whether an ADDR_EXPR has been encountered. */
4196 output_addressed_constants (tree exp
)
4200 switch (TREE_CODE (exp
))
4204 /* Go inside any operations that get_inner_reference can handle and see
4205 if what's inside is a constant: no need to do anything here for
4206 addresses of variables or functions. */
4207 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4208 tem
= TREE_OPERAND (tem
, 0))
4211 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4212 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4213 tem
= DECL_INITIAL (tem
);
4215 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4216 output_constant_def (tem
, 0);
4218 if (TREE_CODE (tem
) == MEM_REF
)
4219 output_addressed_constants (TREE_OPERAND (tem
, 0));
4223 case POINTER_PLUS_EXPR
:
4225 output_addressed_constants (TREE_OPERAND (exp
, 1));
4229 case VIEW_CONVERT_EXPR
:
4230 output_addressed_constants (TREE_OPERAND (exp
, 0));
4235 unsigned HOST_WIDE_INT idx
;
4236 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4238 output_addressed_constants (tem
);
4247 /* Whether a constructor CTOR is a valid static constant initializer if all
4248 its elements are. This used to be internal to initializer_constant_valid_p
4249 and has been exposed to let other functions like categorize_ctor_elements
4250 evaluate the property while walking a constructor for other purposes. */
4253 constructor_static_from_elts_p (const_tree ctor
)
4255 return (TREE_CONSTANT (ctor
)
4256 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4257 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4258 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4261 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4264 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4265 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4266 which are valid when ENDTYPE is an integer of any size; in
4267 particular, this does not accept a pointer minus a constant. This
4268 returns null_pointer_node if the VALUE is an absolute constant
4269 which can be used to initialize a static variable. Otherwise it
4273 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4277 if (!INTEGRAL_TYPE_P (endtype
))
4280 op0
= TREE_OPERAND (value
, 0);
4281 op1
= TREE_OPERAND (value
, 1);
4283 /* Like STRIP_NOPS except allow the operand mode to widen. This
4284 works around a feature of fold that simplifies (int)(p1 - p2) to
4285 ((int)p1 - (int)p2) under the theory that the narrower operation
4288 while (CONVERT_EXPR_P (op0
)
4289 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4291 tree inner
= TREE_OPERAND (op0
, 0);
4292 if (inner
== error_mark_node
4293 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4294 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4295 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4300 while (CONVERT_EXPR_P (op1
)
4301 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4303 tree inner
= TREE_OPERAND (op1
, 0);
4304 if (inner
== error_mark_node
4305 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4306 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4307 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4312 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4316 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4317 cache
? cache
+ 2 : NULL
);
4318 /* Both initializers must be known. */
4322 && (op0
== null_pointer_node
4323 || TREE_CODE (value
) == MINUS_EXPR
))
4324 return null_pointer_node
;
4326 /* Support differences between labels. */
4327 if (TREE_CODE (op0
) == LABEL_DECL
4328 && TREE_CODE (op1
) == LABEL_DECL
)
4329 return null_pointer_node
;
4331 if (TREE_CODE (op0
) == STRING_CST
4332 && TREE_CODE (op1
) == STRING_CST
4333 && operand_equal_p (op0
, op1
, 1))
4334 return null_pointer_node
;
4340 /* Helper function of initializer_constant_valid_p.
4341 Return nonzero if VALUE is a valid constant-valued expression
4342 for use in initializing a static variable; one that can be an
4343 element of a "constant" initializer.
4345 Return null_pointer_node if the value is absolute;
4346 if it is relocatable, return the variable that determines the relocation.
4347 We assume that VALUE has been folded as much as possible;
4348 therefore, we do not need to check for such things as
4349 arithmetic-combinations of integers.
4351 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4354 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4358 switch (TREE_CODE (value
))
4361 if (constructor_static_from_elts_p (value
))
4363 unsigned HOST_WIDE_INT idx
;
4365 bool absolute
= true;
4367 if (cache
&& cache
[0] == value
)
4369 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4372 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4379 cache
[1] = NULL_TREE
;
4383 if (reloc
!= null_pointer_node
)
4386 /* For a non-absolute relocation, there is no single
4387 variable that can be "the variable that determines the
4392 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4394 return absolute
? null_pointer_node
: error_mark_node
;
4397 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4405 return null_pointer_node
;
4410 tree op0
= staticp (TREE_OPERAND (value
, 0));
4413 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4414 to be a constant, this is old-skool offsetof-like nonsense. */
4415 if (TREE_CODE (op0
) == INDIRECT_REF
4416 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4417 return null_pointer_node
;
4418 /* Taking the address of a nested function involves a trampoline,
4419 unless we don't need or want one. */
4420 if (TREE_CODE (op0
) == FUNCTION_DECL
4421 && DECL_STATIC_CHAIN (op0
)
4422 && !TREE_NO_TRAMPOLINE (value
))
4424 /* "&{...}" requires a temporary to hold the constructed
4426 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4432 case NON_LVALUE_EXPR
:
4433 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4436 case VIEW_CONVERT_EXPR
:
4438 tree src
= TREE_OPERAND (value
, 0);
4439 tree src_type
= TREE_TYPE (src
);
4440 tree dest_type
= TREE_TYPE (value
);
4442 /* Allow view-conversions from aggregate to non-aggregate type only
4443 if the bit pattern is fully preserved afterwards; otherwise, the
4444 RTL expander won't be able to apply a subsequent transformation
4445 to the underlying constructor. */
4446 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4448 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4449 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4454 /* Allow all other kinds of view-conversion. */
4455 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4460 tree src
= TREE_OPERAND (value
, 0);
4461 tree src_type
= TREE_TYPE (src
);
4462 tree dest_type
= TREE_TYPE (value
);
4464 /* Allow conversions between pointer types, floating-point
4465 types, and offset types. */
4466 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4467 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4468 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4469 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4470 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4472 /* Allow length-preserving conversions between integer types. */
4473 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4474 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4475 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4477 /* Allow conversions between other integer types only if
4479 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4481 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4482 if (inner
== null_pointer_node
)
4483 return null_pointer_node
;
4487 /* Allow (int) &foo provided int is as wide as a pointer. */
4488 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4489 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4490 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4492 /* Likewise conversions from int to pointers, but also allow
4493 conversions from 0. */
4494 if ((POINTER_TYPE_P (dest_type
)
4495 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4496 && INTEGRAL_TYPE_P (src_type
))
4498 if (TREE_CODE (src
) == INTEGER_CST
4499 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4500 return null_pointer_node
;
4501 if (integer_zerop (src
))
4502 return null_pointer_node
;
4503 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4504 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4507 /* Allow conversions to struct or union types if the value
4509 if (TREE_CODE (dest_type
) == RECORD_TYPE
4510 || TREE_CODE (dest_type
) == UNION_TYPE
)
4511 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4515 case POINTER_PLUS_EXPR
:
4517 /* Any valid floating-point constants will have been folded by now;
4518 with -frounding-math we hit this with addition of two constants. */
4519 if (TREE_CODE (endtype
) == REAL_TYPE
)
4521 if (cache
&& cache
[0] == value
)
4523 if (! INTEGRAL_TYPE_P (endtype
)
4524 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4526 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4528 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4531 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4532 endtype
, ncache
+ 2);
4533 /* If either term is absolute, use the other term's relocation. */
4534 if (valid0
== null_pointer_node
)
4536 else if (valid1
== null_pointer_node
)
4538 /* Support narrowing pointer differences. */
4540 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4544 /* Support narrowing pointer differences. */
4545 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4554 if (TREE_CODE (endtype
) == REAL_TYPE
)
4556 if (cache
&& cache
[0] == value
)
4558 if (! INTEGRAL_TYPE_P (endtype
)
4559 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4561 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4563 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4566 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4567 endtype
, ncache
+ 2);
4568 /* Win if second argument is absolute. */
4569 if (valid1
== null_pointer_node
)
4571 /* Win if both arguments have the same relocation.
4572 Then the value is absolute. */
4573 else if (valid0
== valid1
&& valid0
!= 0)
4574 ret
= null_pointer_node
;
4575 /* Since GCC guarantees that string constants are unique in the
4576 generated code, a subtraction between two copies of the same
4577 constant string is absolute. */
4578 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4579 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4580 && operand_equal_p (valid0
, valid1
, 1))
4581 ret
= null_pointer_node
;
4582 /* Support narrowing differences. */
4584 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4588 /* Support narrowing differences. */
4589 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4604 /* Return nonzero if VALUE is a valid constant-valued expression
4605 for use in initializing a static variable; one that can be an
4606 element of a "constant" initializer.
4608 Return null_pointer_node if the value is absolute;
4609 if it is relocatable, return the variable that determines the relocation.
4610 We assume that VALUE has been folded as much as possible;
4611 therefore, we do not need to check for such things as
4612 arithmetic-combinations of integers. */
4614 initializer_constant_valid_p (tree value
, tree endtype
)
4616 return initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4619 /* Return true if VALUE is a valid constant-valued expression
4620 for use in initializing a static bit-field; one that can be
4621 an element of a "constant" initializer. */
4624 initializer_constant_valid_for_bitfield_p (tree value
)
4626 /* For bitfields we support integer constants or possibly nested aggregates
4628 switch (TREE_CODE (value
))
4632 unsigned HOST_WIDE_INT idx
;
4635 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4636 if (!initializer_constant_valid_for_bitfield_p (elt
))
4645 case VIEW_CONVERT_EXPR
:
4646 case NON_LVALUE_EXPR
:
4648 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4657 /* output_constructor outer state of relevance in recursive calls, typically
4658 for nested aggregate bitfields. */
4661 unsigned int bit_offset
; /* current position in ... */
4662 int byte
; /* ... the outer byte buffer. */
4665 static unsigned HOST_WIDE_INT
4666 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int,
4669 /* Output assembler code for constant EXP, with no label.
4670 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4671 Assumes output_addressed_constants has been done on EXP already.
4673 Generate at least SIZE bytes of assembler data, padding at the end
4674 with zeros if necessary. SIZE must always be specified. The returned
4675 value is the actual number of bytes of assembler data generated, which
4676 may be bigger than SIZE if the object contains a variable length field.
4678 SIZE is important for structure constructors,
4679 since trailing members may have been omitted from the constructor.
4680 It is also important for initialization of arrays from string constants
4681 since the full length of the string constant might not be wanted.
4682 It is also needed for initialization of unions, where the initializer's
4683 type is just one member, and that may not be as long as the union.
4685 There a case in which we would fail to output exactly SIZE bytes:
4686 for a structure constructor that wants to produce more than SIZE bytes.
4687 But such constructors will never be generated for any possible input.
4689 ALIGN is the alignment of the data in bits. */
4691 static unsigned HOST_WIDE_INT
4692 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4694 enum tree_code code
;
4695 unsigned HOST_WIDE_INT thissize
;
4697 if (size
== 0 || flag_syntax_only
)
4700 /* See if we're trying to initialize a pointer in a non-default mode
4701 to the address of some declaration somewhere. If the target says
4702 the mode is valid for pointers, assume the target has a way of
4704 if (TREE_CODE (exp
) == NOP_EXPR
4705 && POINTER_TYPE_P (TREE_TYPE (exp
))
4706 && targetm
.addr_space
.valid_pointer_mode
4707 (TYPE_MODE (TREE_TYPE (exp
)),
4708 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4710 tree saved_type
= TREE_TYPE (exp
);
4712 /* Peel off any intermediate conversions-to-pointer for valid
4714 while (TREE_CODE (exp
) == NOP_EXPR
4715 && POINTER_TYPE_P (TREE_TYPE (exp
))
4716 && targetm
.addr_space
.valid_pointer_mode
4717 (TYPE_MODE (TREE_TYPE (exp
)),
4718 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4719 exp
= TREE_OPERAND (exp
, 0);
4721 /* If what we're left with is the address of something, we can
4722 convert the address to the final type and output it that
4724 if (TREE_CODE (exp
) == ADDR_EXPR
)
4725 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4726 /* Likewise for constant ints. */
4727 else if (TREE_CODE (exp
) == INTEGER_CST
)
4728 exp
= wide_int_to_tree (saved_type
, exp
);
4732 /* Eliminate any conversions since we'll be outputting the underlying
4734 while (CONVERT_EXPR_P (exp
)
4735 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4736 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4738 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4739 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4741 /* Make sure eliminating the conversion is really a no-op, except with
4742 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4743 union types to allow for Ada unchecked unions. */
4744 if (type_size
> op_size
4745 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4746 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4747 /* Keep the conversion. */
4750 exp
= TREE_OPERAND (exp
, 0);
4753 code
= TREE_CODE (TREE_TYPE (exp
));
4754 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4756 /* Allow a constructor with no elements for any data type.
4757 This means to fill the space with zeros. */
4758 if (TREE_CODE (exp
) == CONSTRUCTOR
4759 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4761 assemble_zeros (size
);
4765 if (TREE_CODE (exp
) == FDESC_EXPR
)
4767 #ifdef ASM_OUTPUT_FDESC
4768 HOST_WIDE_INT part
= tree_to_shwi (TREE_OPERAND (exp
, 1));
4769 tree decl
= TREE_OPERAND (exp
, 0);
4770 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4777 /* Now output the underlying data. If we've handling the padding, return.
4778 Otherwise, break and ensure SIZE is the size written. */
4785 case REFERENCE_TYPE
:
4787 case FIXED_POINT_TYPE
:
4788 case POINTER_BOUNDS_TYPE
:
4790 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4791 EXPAND_INITIALIZER
),
4792 MIN (size
, thissize
), align
, 0))
4793 error ("initializer for integer/fixed-point value is too complicated");
4797 if (TREE_CODE (exp
) != REAL_CST
)
4798 error ("initializer for floating value is not a floating constant");
4800 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4804 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4805 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4806 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4811 switch (TREE_CODE (exp
))
4814 return output_constructor (exp
, size
, align
, NULL
);
4817 = MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
), size
);
4818 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4822 machine_mode inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4823 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4824 int elt_size
= GET_MODE_SIZE (inner
);
4825 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
);
4826 thissize
= elt_size
;
4827 for (unsigned int i
= 1; i
< VECTOR_CST_NELTS (exp
); i
++)
4829 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
);
4830 thissize
+= elt_size
;
4841 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4842 return output_constructor (exp
, size
, align
, NULL
);
4851 if (size
> thissize
)
4852 assemble_zeros (size
- thissize
);
4858 /* Subroutine of output_constructor, used for computing the size of
4859 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4860 type with an unspecified upper bound. */
4862 static unsigned HOST_WIDE_INT
4863 array_size_for_constructor (tree val
)
4866 unsigned HOST_WIDE_INT cnt
;
4867 tree index
, value
, tmp
;
4870 /* This code used to attempt to handle string constants that are not
4871 arrays of single-bytes, but nothing else does, so there's no point in
4873 if (TREE_CODE (val
) == STRING_CST
)
4874 return TREE_STRING_LENGTH (val
);
4876 max_index
= NULL_TREE
;
4877 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4879 if (TREE_CODE (index
) == RANGE_EXPR
)
4880 index
= TREE_OPERAND (index
, 1);
4881 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4885 if (max_index
== NULL_TREE
)
4888 /* Compute the total number of array elements. */
4889 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4890 i
= wi::to_offset (max_index
) - wi::to_offset (tmp
) + 1;
4892 /* Multiply by the array element unit size to find number of bytes. */
4893 i
*= wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4895 gcc_assert (wi::fits_uhwi_p (i
));
4896 return i
.to_uhwi ();
4899 /* Other datastructures + helpers for output_constructor. */
4901 /* output_constructor local state to support interaction with helpers. */
4905 /* Received arguments. */
4906 tree exp
; /* Constructor expression. */
4907 tree type
; /* Type of constructor expression. */
4908 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4909 unsigned int align
; /* Known initial alignment. */
4910 tree min_index
; /* Lower bound if specified for an array. */
4912 /* Output processing state. */
4913 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4914 int byte
; /* Part of a bitfield byte yet to be output. */
4915 int last_relative_index
; /* Implicit or explicit index of the last
4916 array element output within a bitfield. */
4917 bool byte_buffer_in_use
; /* Whether BYTE is in use. */
4919 /* Current element. */
4920 tree field
; /* Current field decl in a record. */
4921 tree val
; /* Current element value. */
4922 tree index
; /* Current element index. */
4926 /* Helper for output_constructor. From the current LOCAL state, output a
4927 RANGE_EXPR element. */
4930 output_constructor_array_range (oc_local_state
*local
)
4932 unsigned HOST_WIDE_INT fieldsize
4933 = int_size_in_bytes (TREE_TYPE (local
->type
));
4935 HOST_WIDE_INT lo_index
4936 = tree_to_shwi (TREE_OPERAND (local
->index
, 0));
4937 HOST_WIDE_INT hi_index
4938 = tree_to_shwi (TREE_OPERAND (local
->index
, 1));
4939 HOST_WIDE_INT index
;
4942 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4944 for (index
= lo_index
; index
<= hi_index
; index
++)
4946 /* Output the element's initial value. */
4947 if (local
->val
== NULL_TREE
)
4948 assemble_zeros (fieldsize
);
4950 fieldsize
= output_constant (local
->val
, fieldsize
, align2
);
4952 /* Count its size. */
4953 local
->total_bytes
+= fieldsize
;
4957 /* Helper for output_constructor. From the current LOCAL state, output a
4958 field element that is not true bitfield or part of an outer one. */
4961 output_constructor_regular_field (oc_local_state
*local
)
4963 /* Field size and position. Since this structure is static, we know the
4964 positions are constant. */
4965 unsigned HOST_WIDE_INT fieldsize
;
4966 HOST_WIDE_INT fieldpos
;
4968 unsigned int align2
;
4970 if (local
->index
!= NULL_TREE
)
4972 /* Perform the index calculation in modulo arithmetic but
4973 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4974 but we are using an unsigned sizetype. */
4975 unsigned prec
= TYPE_PRECISION (sizetype
);
4976 offset_int idx
= wi::sext (wi::to_offset (local
->index
)
4977 - wi::to_offset (local
->min_index
), prec
);
4978 fieldpos
= (idx
* wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
))))
4981 else if (local
->field
!= NULL_TREE
)
4982 fieldpos
= int_byte_position (local
->field
);
4986 /* Output any buffered-up bit-fields preceding this element. */
4987 if (local
->byte_buffer_in_use
)
4989 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4990 local
->total_bytes
++;
4991 local
->byte_buffer_in_use
= false;
4994 /* Advance to offset of this element.
4995 Note no alignment needed in an array, since that is guaranteed
4996 if each element has the proper size. */
4997 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4998 && fieldpos
> local
->total_bytes
)
5000 assemble_zeros (fieldpos
- local
->total_bytes
);
5001 local
->total_bytes
= fieldpos
;
5004 /* Find the alignment of this element. */
5005 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
5007 /* Determine size this element should occupy. */
5012 /* If this is an array with an unspecified upper bound,
5013 the initializer determines the size. */
5014 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
5015 but we cannot do this until the deprecated support for
5016 initializing zero-length array members is removed. */
5017 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
5018 && TYPE_DOMAIN (TREE_TYPE (local
->field
))
5019 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
))))
5021 fieldsize
= array_size_for_constructor (local
->val
);
5022 /* Given a non-empty initialization, this field had
5024 gcc_assert (!fieldsize
|| !DECL_CHAIN (local
->field
));
5027 fieldsize
= tree_to_uhwi (DECL_SIZE_UNIT (local
->field
));
5030 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
5032 /* Output the element's initial value. */
5033 if (local
->val
== NULL_TREE
)
5034 assemble_zeros (fieldsize
);
5036 fieldsize
= output_constant (local
->val
, fieldsize
, align2
);
5038 /* Count its size. */
5039 local
->total_bytes
+= fieldsize
;
5042 /* Helper for output_constructor. From the LOCAL state, output an element
5043 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
5044 from the start of a possibly ongoing outer byte buffer. */
5047 output_constructor_bitfield (oc_local_state
*local
, unsigned int bit_offset
)
5049 /* Bit size of this element. */
5050 HOST_WIDE_INT ebitsize
5052 ? tree_to_uhwi (DECL_SIZE (local
->field
))
5053 : tree_to_uhwi (TYPE_SIZE (TREE_TYPE (local
->type
))));
5055 /* Relative index of this element if this is an array component. */
5056 HOST_WIDE_INT relative_index
5059 ? (tree_to_shwi (local
->index
)
5060 - tree_to_shwi (local
->min_index
))
5061 : local
->last_relative_index
+ 1)
5064 /* Bit position of this element from the start of the containing
5066 HOST_WIDE_INT constructor_relative_ebitpos
5068 ? int_bit_position (local
->field
)
5069 : ebitsize
* relative_index
);
5071 /* Bit position of this element from the start of a possibly ongoing
5072 outer byte buffer. */
5073 HOST_WIDE_INT byte_relative_ebitpos
5074 = bit_offset
+ constructor_relative_ebitpos
;
5076 /* From the start of a possibly ongoing outer byte buffer, offsets to
5077 the first bit of this element and to the first bit past the end of
5079 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
5080 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
5082 local
->last_relative_index
= relative_index
;
5084 if (local
->val
== NULL_TREE
)
5085 local
->val
= integer_zero_node
;
5087 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
5088 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
5089 local
->val
= TREE_OPERAND (local
->val
, 0);
5091 if (TREE_CODE (local
->val
) != INTEGER_CST
5092 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
5094 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
5098 /* If this field does not start in this (or next) byte, skip some bytes. */
5099 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5101 /* Output remnant of any bit field in previous bytes. */
5102 if (local
->byte_buffer_in_use
)
5104 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5105 local
->total_bytes
++;
5106 local
->byte_buffer_in_use
= false;
5109 /* If still not at proper byte, advance to there. */
5110 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5112 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
5113 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
5114 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
5118 /* Set up the buffer if necessary. */
5119 if (!local
->byte_buffer_in_use
)
5123 local
->byte_buffer_in_use
= true;
5126 /* If this is nested constructor, recurse passing the bit offset and the
5127 pending data, then retrieve the new pending data afterwards. */
5128 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
5130 oc_outer_state temp_state
;
5131 temp_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
5132 temp_state
.byte
= local
->byte
;
5134 += output_constructor (local
->val
, 0, 0, &temp_state
);
5135 local
->byte
= temp_state
.byte
;
5139 /* Otherwise, we must split the element into pieces that fall within
5140 separate bytes, and combine each byte with previous or following
5142 while (next_offset
< end_offset
)
5146 HOST_WIDE_INT value
;
5147 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
5148 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
5150 /* Advance from byte to byte within this element when necessary. */
5151 while (next_byte
!= local
->total_bytes
)
5153 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5154 local
->total_bytes
++;
5158 /* Number of bits we can process at once (all part of the same byte). */
5159 this_time
= MIN (end_offset
- next_offset
, BITS_PER_UNIT
- next_bit
);
5160 if (BYTES_BIG_ENDIAN
)
5162 /* On big-endian machine, take the most significant bits (of the
5163 bits that are significant) first and put them into bytes from
5164 the most significant end. */
5165 shift
= end_offset
- next_offset
- this_time
;
5167 /* Don't try to take a bunch of bits that cross
5168 the word boundary in the INTEGER_CST. We can
5169 only select bits from one element. */
5170 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5171 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5173 const int end
= shift
+ this_time
- 1;
5174 shift
= end
& -HOST_BITS_PER_WIDE_INT
;
5175 this_time
= end
- shift
+ 1;
5178 /* Now get the bits from the appropriate constant word. */
5179 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5180 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5182 /* Get the result. This works only when:
5183 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5184 local
->byte
|= (((value
>> shift
)
5185 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5186 << (BITS_PER_UNIT
- this_time
- next_bit
));
5190 /* On little-endian machines, take the least significant bits of
5191 the value first and pack them starting at the least significant
5192 bits of the bytes. */
5193 shift
= next_offset
- byte_relative_ebitpos
;
5195 /* Don't try to take a bunch of bits that cross
5196 the word boundary in the INTEGER_CST. We can
5197 only select bits from one element. */
5198 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5199 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5201 = HOST_BITS_PER_WIDE_INT
- (shift
& (HOST_BITS_PER_WIDE_INT
- 1));
5203 /* Now get the bits from the appropriate constant word. */
5204 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5205 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5207 /* Get the result. This works only when:
5208 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5209 local
->byte
|= (((value
>> shift
)
5210 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5214 next_offset
+= this_time
;
5215 local
->byte_buffer_in_use
= true;
5219 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5220 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5221 caller output state of relevance in recursive invocations. */
5223 static unsigned HOST_WIDE_INT
5224 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
5225 unsigned int align
, oc_outer_state
*outer
)
5227 unsigned HOST_WIDE_INT cnt
;
5228 constructor_elt
*ce
;
5230 oc_local_state local
;
5232 /* Setup our local state to communicate with helpers. */
5234 local
.type
= TREE_TYPE (exp
);
5236 local
.align
= align
;
5237 if (TREE_CODE (local
.type
) == ARRAY_TYPE
&& TYPE_DOMAIN (local
.type
))
5238 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5240 local
.min_index
= NULL_TREE
;
5242 local
.total_bytes
= 0;
5243 local
.byte_buffer_in_use
= outer
!= NULL
;
5244 local
.byte
= outer
? outer
->byte
: 0;
5245 local
.last_relative_index
= -1;
5247 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5249 /* As CE goes through the elements of the constant, FIELD goes through the
5250 structure fields if the constant is a structure. If the constant is a
5251 union, we override this by getting the field from the TREE_LIST element.
5252 But the constant could also be an array. Then FIELD is zero.
5254 There is always a maximum of one element in the chain LINK for unions
5255 (even if the initializer in a source program incorrectly contains
5258 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5259 local
.field
= TYPE_FIELDS (local
.type
);
5261 local
.field
= NULL_TREE
;
5264 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5265 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5267 local
.val
= ce
->value
;
5268 local
.index
= NULL_TREE
;
5270 /* The element in a union constructor specifies the proper field
5272 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5273 local
.field
= ce
->index
;
5275 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5276 local
.index
= ce
->index
;
5278 if (local
.field
&& flag_verbose_asm
)
5279 fprintf (asm_out_file
, "%s %s:\n",
5281 DECL_NAME (local
.field
)
5282 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5285 /* Eliminate the marker that makes a cast not be an lvalue. */
5286 if (local
.val
!= NULL_TREE
)
5287 STRIP_NOPS (local
.val
);
5289 /* Output the current element, using the appropriate helper ... */
5291 /* For an array slice not part of an outer bitfield. */
5293 && local
.index
!= NULL_TREE
5294 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5295 output_constructor_array_range (&local
);
5297 /* For a field that is neither a true bitfield nor part of an outer one,
5298 known to be at least byte aligned and multiple-of-bytes long. */
5300 && (local
.field
== NULL_TREE
5301 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5302 output_constructor_regular_field (&local
);
5304 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5305 supported for scalar fields, so we may need to convert first. */
5308 if (TREE_CODE (local
.val
) == REAL_CST
)
5310 = fold_unary (VIEW_CONVERT_EXPR
,
5311 build_nonstandard_integer_type
5312 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5314 output_constructor_bitfield (&local
, outer
? outer
->bit_offset
: 0);
5318 /* If we are not at toplevel, save the pending data for our caller.
5319 Otherwise output the pending data and padding zeros as needed. */
5321 outer
->byte
= local
.byte
;
5324 if (local
.byte_buffer_in_use
)
5326 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5327 local
.total_bytes
++;
5330 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5332 assemble_zeros (local
.size
- local
.total_bytes
);
5333 local
.total_bytes
= local
.size
;
5337 return local
.total_bytes
;
5340 /* Mark DECL as weak. */
5343 mark_weak (tree decl
)
5345 if (DECL_WEAK (decl
))
5348 struct symtab_node
*n
= symtab_node::get (decl
);
5349 if (n
&& n
->refuse_visibility_changes
)
5350 error ("%+D declared weak after being used", decl
);
5351 DECL_WEAK (decl
) = 1;
5353 if (DECL_RTL_SET_P (decl
)
5354 && MEM_P (DECL_RTL (decl
))
5355 && XEXP (DECL_RTL (decl
), 0)
5356 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5357 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5360 /* Merge weak status between NEWDECL and OLDDECL. */
5363 merge_weak (tree newdecl
, tree olddecl
)
5365 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5367 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5370 /* We put the NEWDECL on the weak_decls list at some point
5371 and OLDDECL as well. Keep just OLDDECL on the list. */
5372 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5373 if (TREE_VALUE (*pwd
) == newdecl
)
5375 *pwd
= TREE_CHAIN (*pwd
);
5382 if (DECL_WEAK (newdecl
))
5386 /* NEWDECL is weak, but OLDDECL is not. */
5388 /* If we already output the OLDDECL, we're in trouble; we can't
5389 go back and make it weak. This should never happen in
5390 unit-at-a-time compilation. */
5391 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5393 /* If we've already generated rtl referencing OLDDECL, we may
5394 have done so in a way that will not function properly with
5395 a weak symbol. Again in unit-at-a-time this should be
5397 gcc_assert (!TREE_USED (olddecl
)
5398 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5400 if (TARGET_SUPPORTS_WEAK
)
5402 /* We put the NEWDECL on the weak_decls list at some point.
5403 Replace it with the OLDDECL. */
5404 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5405 if (TREE_VALUE (wd
) == newdecl
)
5407 TREE_VALUE (wd
) = olddecl
;
5410 /* We may not find the entry on the list. If NEWDECL is a
5411 weak alias, then we will have already called
5412 globalize_decl to remove the entry; in that case, we do
5413 not need to do anything. */
5416 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5417 mark_weak (olddecl
);
5420 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5421 weak. Just update NEWDECL to indicate that it's weak too. */
5422 mark_weak (newdecl
);
5425 /* Declare DECL to be a weak symbol. */
5428 declare_weak (tree decl
)
5430 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5431 if (! TREE_PUBLIC (decl
))
5432 error ("weak declaration of %q+D must be public", decl
);
5433 else if (!TARGET_SUPPORTS_WEAK
)
5434 warning (0, "weak declaration of %q+D not supported", decl
);
5437 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5438 DECL_ATTRIBUTES (decl
)
5439 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5443 weak_finish_1 (tree decl
)
5445 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5446 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5449 if (! TREE_USED (decl
))
5452 #ifdef ASM_WEAKEN_DECL
5453 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5455 #ifdef ASM_WEAKEN_LABEL
5456 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5458 #ifdef ASM_OUTPUT_WEAK_ALIAS
5460 static bool warn_once
= 0;
5463 warning (0, "only weak aliases are supported in this configuration");
5473 /* Fiven an assembly name, find the decl it is associated with. */
5475 find_decl (tree target
)
5477 symtab_node
*node
= symtab_node::get_for_asmname (target
);
5483 /* This TREE_LIST contains weakref targets. */
5485 static GTY(()) tree weakref_targets
;
5487 /* Emit any pending weak declarations. */
5494 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5496 tree alias_decl
= TREE_PURPOSE (t
);
5497 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5499 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5500 /* Remove alias_decl from the weak list, but leave entries for
5501 the target alone. */
5503 #ifndef ASM_OUTPUT_WEAKREF
5504 else if (! TREE_SYMBOL_REFERENCED (target
))
5506 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5507 defined, otherwise we and weak_finish_1 would use
5508 different macros. */
5509 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5510 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5512 tree decl
= find_decl (target
);
5516 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5517 TREE_CODE (alias_decl
), target
,
5518 TREE_TYPE (alias_decl
));
5520 DECL_EXTERNAL (decl
) = 1;
5521 TREE_PUBLIC (decl
) = 1;
5522 DECL_ARTIFICIAL (decl
) = 1;
5523 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5524 TREE_USED (decl
) = 1;
5527 weak_finish_1 (decl
);
5536 /* Remove the alias and the target from the pending weak list
5537 so that we do not emit any .weak directives for the former,
5538 nor multiple .weak directives for the latter. */
5539 for (p
= &weak_decls
; (t2
= *p
) ; )
5541 if (TREE_VALUE (t2
) == alias_decl
5542 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5543 *p
= TREE_CHAIN (t2
);
5545 p
= &TREE_CHAIN (t2
);
5548 /* Remove other weakrefs to the same target, to speed things up. */
5549 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5551 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5552 *p
= TREE_CHAIN (t2
);
5554 p
= &TREE_CHAIN (t2
);
5559 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5561 tree decl
= TREE_VALUE (t
);
5563 weak_finish_1 (decl
);
5567 /* Emit the assembly bits to indicate that DECL is globally visible. */
5570 globalize_decl (tree decl
)
5573 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5574 if (DECL_WEAK (decl
))
5576 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5579 #ifdef ASM_WEAKEN_DECL
5580 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5582 ASM_WEAKEN_LABEL (asm_out_file
, name
);
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
) ; )
5589 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5590 *p
= TREE_CHAIN (t
);
5592 p
= &TREE_CHAIN (t
);
5595 /* Remove weakrefs to the same target from the pending weakref
5596 list, for the same reason. */
5597 for (p
= &weakref_targets
; (t
= *p
) ; )
5599 if (DECL_ASSEMBLER_NAME (decl
)
5600 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5601 *p
= TREE_CHAIN (t
);
5603 p
= &TREE_CHAIN (t
);
5610 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5613 vec
<alias_pair
, va_gc
> *alias_pairs
;
5615 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5616 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5617 tree node is DECL to have the value of the tree node TARGET. */
5620 do_assemble_alias (tree decl
, tree target
)
5624 /* Emulated TLS had better not get this var. */
5625 gcc_assert (!(!targetm
.have_tls
5626 && TREE_CODE (decl
) == VAR_DECL
5627 && DECL_THREAD_LOCAL_P (decl
)));
5629 if (TREE_ASM_WRITTEN (decl
))
5632 id
= DECL_ASSEMBLER_NAME (decl
);
5633 ultimate_transparent_alias_target (&id
);
5634 ultimate_transparent_alias_target (&target
);
5636 /* We must force creation of DECL_RTL for debug info generation, even though
5637 we don't use it here. */
5638 make_decl_rtl (decl
);
5640 TREE_ASM_WRITTEN (decl
) = 1;
5641 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5642 TREE_ASM_WRITTEN (id
) = 1;
5644 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5646 if (!TREE_SYMBOL_REFERENCED (target
))
5647 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5649 #ifdef ASM_OUTPUT_WEAKREF
5650 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5651 IDENTIFIER_POINTER (id
),
5652 IDENTIFIER_POINTER (target
));
5654 if (!TARGET_SUPPORTS_WEAK
)
5656 error_at (DECL_SOURCE_LOCATION (decl
),
5657 "weakref is not supported in this configuration");
5664 #ifdef ASM_OUTPUT_DEF
5665 tree orig_decl
= decl
;
5667 if (TREE_CODE (decl
) == FUNCTION_DECL
5668 && cgraph_node::get (decl
)->instrumentation_clone
5669 && cgraph_node::get (decl
)->instrumented_version
)
5670 orig_decl
= cgraph_node::get (decl
)->instrumented_version
->decl
;
5672 /* Make name accessible from other files, if appropriate. */
5674 if (TREE_PUBLIC (decl
) || TREE_PUBLIC (orig_decl
))
5676 globalize_decl (decl
);
5677 maybe_assemble_visibility (decl
);
5679 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5681 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5682 if (targetm
.has_ifunc_p ())
5683 ASM_OUTPUT_TYPE_DIRECTIVE
5684 (asm_out_file
, IDENTIFIER_POINTER (id
),
5688 error_at (DECL_SOURCE_LOCATION (decl
),
5689 "ifunc is not supported on this target");
5692 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5693 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5695 ASM_OUTPUT_DEF (asm_out_file
,
5696 IDENTIFIER_POINTER (id
),
5697 IDENTIFIER_POINTER (target
));
5699 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5704 name
= IDENTIFIER_POINTER (id
);
5705 # ifdef ASM_WEAKEN_DECL
5706 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5708 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5710 /* Remove this function from the pending weak list so that
5711 we do not emit multiple .weak directives for it. */
5712 for (p
= &weak_decls
; (t
= *p
) ; )
5713 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
))
5714 || id
== DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5715 *p
= TREE_CHAIN (t
);
5717 p
= &TREE_CHAIN (t
);
5719 /* Remove weakrefs to the same target from the pending weakref
5720 list, for the same reason. */
5721 for (p
= &weakref_targets
; (t
= *p
) ; )
5723 if (id
== ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5724 *p
= TREE_CHAIN (t
);
5726 p
= &TREE_CHAIN (t
);
5732 /* Emit an assembler directive to make the symbol for DECL an alias to
5733 the symbol for TARGET. */
5736 assemble_alias (tree decl
, tree target
)
5740 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5742 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5744 ultimate_transparent_alias_target (&target
);
5746 if (alias
== target
)
5747 error ("weakref %q+D ultimately targets itself", decl
);
5748 if (TREE_PUBLIC (decl
))
5749 error ("weakref %q+D must have static linkage", decl
);
5753 #if !defined (ASM_OUTPUT_DEF)
5754 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5755 error_at (DECL_SOURCE_LOCATION (decl
),
5756 "alias definitions not supported in this configuration");
5757 TREE_ASM_WRITTEN (decl
) = 1;
5760 if (!DECL_WEAK (decl
))
5762 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5763 error_at (DECL_SOURCE_LOCATION (decl
),
5764 "ifunc is not supported in this configuration");
5766 error_at (DECL_SOURCE_LOCATION (decl
),
5767 "only weak aliases are supported in this configuration");
5768 TREE_ASM_WRITTEN (decl
) = 1;
5774 TREE_USED (decl
) = 1;
5776 /* Allow aliases to aliases. */
5777 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5778 cgraph_node::get_create (decl
)->alias
= true;
5780 varpool_node::get_create (decl
)->alias
= true;
5782 /* If the target has already been emitted, we don't have to queue the
5783 alias. This saves a tad of memory. */
5784 if (symtab
->global_info_ready
)
5785 target_decl
= find_decl (target
);
5788 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5789 || symtab
->state
>= EXPANSION
)
5790 do_assemble_alias (decl
, target
);
5793 alias_pair p
= {decl
, target
};
5794 vec_safe_push (alias_pairs
, p
);
5798 /* Record and output a table of translations from original function
5799 to its transaction aware clone. Note that tm_pure functions are
5800 considered to be their own clone. */
5802 struct tm_clone_hasher
: ggc_cache_hasher
<tree_map
*>
5804 static hashval_t
hash (tree_map
*m
) { return tree_map_hash (m
); }
5805 static bool equal (tree_map
*a
, tree_map
*b
) { return tree_map_eq (a
, b
); }
5808 handle_cache_entry (tree_map
*&e
)
5810 extern void gt_ggc_mx (tree_map
*&);
5811 if (e
== HTAB_EMPTY_ENTRY
|| e
== HTAB_DELETED_ENTRY
)
5813 else if (ggc_marked_p (e
->base
.from
))
5816 e
= static_cast<tree_map
*> (HTAB_DELETED_ENTRY
);
5820 static GTY((cache
)) hash_table
<tm_clone_hasher
> *tm_clone_hash
;
5823 record_tm_clone_pair (tree o
, tree n
)
5825 struct tree_map
**slot
, *h
;
5827 if (tm_clone_hash
== NULL
)
5828 tm_clone_hash
= hash_table
<tm_clone_hasher
>::create_ggc (32);
5830 h
= ggc_alloc
<tree_map
> ();
5831 h
->hash
= htab_hash_pointer (o
);
5835 slot
= tm_clone_hash
->find_slot_with_hash (h
, h
->hash
, INSERT
);
5840 get_tm_clone_pair (tree o
)
5844 struct tree_map
*h
, in
;
5847 in
.hash
= htab_hash_pointer (o
);
5848 h
= tm_clone_hash
->find_with_hash (&in
, in
.hash
);
5855 typedef struct tm_alias_pair
5863 /* Dump the actual pairs to the .tm_clone_table section. */
5866 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5870 bool switched
= false;
5872 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5876 struct cgraph_node
*src_n
= cgraph_node::get (src
);
5877 struct cgraph_node
*dst_n
= cgraph_node::get (dst
);
5879 /* The function ipa_tm_create_version() marks the clone as needed if
5880 the original function was needed. But we also mark the clone as
5881 needed if we ever called the clone indirectly through
5882 TM_GETTMCLONE. If neither of these are true, we didn't generate
5883 a clone, and we didn't call it indirectly... no sense keeping it
5884 in the clone table. */
5885 if (!dst_n
|| !dst_n
->definition
)
5888 /* This covers the case where we have optimized the original
5889 function away, and only access the transactional clone. */
5890 if (!src_n
|| !src_n
->definition
)
5895 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5896 assemble_align (POINTER_SIZE
);
5900 assemble_integer (XEXP (DECL_RTL (src
), 0),
5901 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
5902 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5903 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
5907 /* Provide a default for the tm_clone_table section. */
5910 default_clone_table_section (void)
5912 return get_named_section (NULL
, ".tm_clone_table", 3);
5915 /* Helper comparison function for qsorting by the DECL_UID stored in
5916 alias_pair->emitted_diags. */
5919 tm_alias_pair_cmp (const void *x
, const void *y
)
5921 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5922 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5923 if (p1
->uid
< p2
->uid
)
5925 if (p1
->uid
> p2
->uid
)
5931 finish_tm_clone_pairs (void)
5933 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5935 if (tm_clone_hash
== NULL
)
5938 /* We need a determenistic order for the .tm_clone_table, otherwise
5939 we will get bootstrap comparison failures, so dump the hash table
5940 to a vector, sort it, and dump the vector. */
5942 /* Dump the hashtable to a vector. */
5944 hash_table
<tm_clone_hasher
>::iterator iter
;
5945 FOR_EACH_HASH_TABLE_ELEMENT (*tm_clone_hash
, map
, tree_map
*, iter
)
5947 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5948 tm_alias_pairs
.safe_push (p
);
5951 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5954 dump_tm_clone_pairs (tm_alias_pairs
);
5956 tm_clone_hash
->empty ();
5957 tm_clone_hash
= NULL
;
5958 tm_alias_pairs
.release ();
5962 /* Emit an assembler directive to set symbol for DECL visibility to
5963 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5966 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5967 int vis ATTRIBUTE_UNUSED
)
5969 #ifdef HAVE_GAS_HIDDEN
5970 static const char * const visibility_types
[] = {
5971 NULL
, "protected", "hidden", "internal"
5974 const char *name
, *type
;
5977 id
= DECL_ASSEMBLER_NAME (decl
);
5978 ultimate_transparent_alias_target (&id
);
5979 name
= IDENTIFIER_POINTER (id
);
5981 type
= visibility_types
[vis
];
5983 fprintf (asm_out_file
, "\t.%s\t", type
);
5984 assemble_name (asm_out_file
, name
);
5985 fprintf (asm_out_file
, "\n");
5987 if (!DECL_ARTIFICIAL (decl
))
5988 warning (OPT_Wattributes
, "visibility attribute not supported "
5989 "in this configuration; ignored");
5993 /* A helper function to call assemble_visibility when needed for a decl. */
5996 maybe_assemble_visibility (tree decl
)
5998 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
6000 if (TREE_CODE (decl
) == FUNCTION_DECL
6001 && cgraph_node::get (decl
)
6002 && cgraph_node::get (decl
)->instrumentation_clone
6003 && cgraph_node::get (decl
)->instrumented_version
)
6004 vis
= DECL_VISIBILITY (cgraph_node::get (decl
)->instrumented_version
->decl
);
6006 if (vis
!= VISIBILITY_DEFAULT
)
6008 targetm
.asm_out
.assemble_visibility (decl
, vis
);
6015 /* Returns 1 if the target configuration supports defining public symbols
6016 so that one of them will be chosen at link time instead of generating a
6017 multiply-defined symbol error, whether through the use of weak symbols or
6018 a target-specific mechanism for having duplicates discarded. */
6021 supports_one_only (void)
6023 if (SUPPORTS_ONE_ONLY
)
6025 return TARGET_SUPPORTS_WEAK
;
6028 /* Set up DECL as a public symbol that can be defined in multiple
6029 translation units without generating a linker error. */
6032 make_decl_one_only (tree decl
, tree comdat_group
)
6034 struct symtab_node
*symbol
;
6035 gcc_assert (TREE_CODE (decl
) == VAR_DECL
6036 || TREE_CODE (decl
) == FUNCTION_DECL
);
6038 TREE_PUBLIC (decl
) = 1;
6040 if (TREE_CODE (decl
) == VAR_DECL
)
6041 symbol
= varpool_node::get_create (decl
);
6043 symbol
= cgraph_node::get_create (decl
);
6045 if (SUPPORTS_ONE_ONLY
)
6047 #ifdef MAKE_DECL_ONE_ONLY
6048 MAKE_DECL_ONE_ONLY (decl
);
6050 symbol
->set_comdat_group (comdat_group
);
6052 else if (TREE_CODE (decl
) == VAR_DECL
6053 && (DECL_INITIAL (decl
) == 0
6054 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6055 DECL_COMMON (decl
) = 1;
6058 gcc_assert (TARGET_SUPPORTS_WEAK
);
6059 DECL_WEAK (decl
) = 1;
6064 init_varasm_once (void)
6066 section_htab
= hash_table
<section_hasher
>::create_ggc (31);
6067 object_block_htab
= hash_table
<object_block_hasher
>::create_ggc (31);
6068 const_desc_htab
= hash_table
<tree_descriptor_hasher
>::create_ggc (1009);
6070 shared_constant_pool
= create_constant_pool ();
6072 #ifdef TEXT_SECTION_ASM_OP
6073 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
6074 TEXT_SECTION_ASM_OP
);
6077 #ifdef DATA_SECTION_ASM_OP
6078 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6079 DATA_SECTION_ASM_OP
);
6082 #ifdef SDATA_SECTION_ASM_OP
6083 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6084 SDATA_SECTION_ASM_OP
);
6087 #ifdef READONLY_DATA_SECTION_ASM_OP
6088 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
6089 READONLY_DATA_SECTION_ASM_OP
);
6092 #ifdef CTORS_SECTION_ASM_OP
6093 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
6094 CTORS_SECTION_ASM_OP
);
6097 #ifdef DTORS_SECTION_ASM_OP
6098 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
6099 DTORS_SECTION_ASM_OP
);
6102 #ifdef BSS_SECTION_ASM_OP
6103 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6104 output_section_asm_op
,
6105 BSS_SECTION_ASM_OP
);
6108 #ifdef SBSS_SECTION_ASM_OP
6109 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6110 output_section_asm_op
,
6111 SBSS_SECTION_ASM_OP
);
6114 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6115 | SECTION_COMMON
, emit_tls_common
);
6116 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6117 | SECTION_COMMON
, emit_local
);
6118 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6119 | SECTION_COMMON
, emit_common
);
6121 #if defined ASM_OUTPUT_ALIGNED_BSS
6122 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
6126 targetm
.asm_out
.init_sections ();
6128 if (readonly_data_section
== NULL
)
6129 readonly_data_section
= text_section
;
6131 #ifdef ASM_OUTPUT_EXTERNAL
6132 pending_assemble_externals_set
= new hash_set
<tree
>;
6137 decl_default_tls_model (const_tree decl
)
6139 enum tls_model kind
;
6142 is_local
= targetm
.binds_local_p (decl
);
6146 kind
= TLS_MODEL_LOCAL_EXEC
;
6148 kind
= TLS_MODEL_INITIAL_EXEC
;
6151 /* Local dynamic is inefficient when we're not combining the
6152 parts of the address. */
6153 else if (optimize
&& is_local
)
6154 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
6156 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
6157 if (kind
< flag_tls_default
)
6158 kind
= flag_tls_default
;
6163 /* Select a set of attributes for section NAME based on the properties
6164 of DECL and whether or not RELOC indicates that DECL's initializer
6165 might contain runtime relocations.
6167 We make the section read-only and executable for a function decl,
6168 read-only for a const data decl, and writable for a non-const data decl. */
6171 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6175 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6176 flags
= SECTION_CODE
;
6179 enum section_category category
6180 = categorize_decl_for_section (decl
, reloc
);
6181 if (decl_readonly_section_1 (category
))
6183 else if (category
== SECCAT_DATA_REL_RO
6184 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6185 flags
= SECTION_WRITE
| SECTION_RELRO
;
6187 flags
= SECTION_WRITE
;
6191 flags
= SECTION_WRITE
;
6192 if (strcmp (name
, ".data.rel.ro") == 0
6193 || strcmp (name
, ".data.rel.ro.local") == 0)
6194 flags
|= SECTION_RELRO
;
6197 if (decl
&& DECL_P (decl
) && DECL_COMDAT_GROUP (decl
))
6198 flags
|= SECTION_LINKONCE
;
6200 if (strcmp (name
, ".vtable_map_vars") == 0)
6201 flags
|= SECTION_LINKONCE
;
6203 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6204 flags
|= SECTION_TLS
| SECTION_WRITE
;
6206 if (strcmp (name
, ".bss") == 0
6207 || strncmp (name
, ".bss.", 5) == 0
6208 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6209 || strcmp (name
, ".persistent.bss") == 0
6210 || strcmp (name
, ".sbss") == 0
6211 || strncmp (name
, ".sbss.", 6) == 0
6212 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6213 flags
|= SECTION_BSS
;
6215 if (strcmp (name
, ".tdata") == 0
6216 || strncmp (name
, ".tdata.", 7) == 0
6217 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6218 flags
|= SECTION_TLS
;
6220 if (strcmp (name
, ".tbss") == 0
6221 || strncmp (name
, ".tbss.", 6) == 0
6222 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6223 flags
|= SECTION_TLS
| SECTION_BSS
;
6225 /* These three sections have special ELF types. They are neither
6226 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6227 want to print a section type (@progbits or @nobits). If someone
6228 is silly enough to emit code or TLS variables to one of these
6229 sections, then don't handle them specially. */
6230 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6231 && (strcmp (name
, ".init_array") == 0
6232 || strcmp (name
, ".fini_array") == 0
6233 || strcmp (name
, ".preinit_array") == 0))
6234 flags
|= SECTION_NOTYPE
;
6239 /* Return true if the target supports some form of global BSS,
6240 either through bss_noswitch_section, or by selecting a BSS
6241 section in TARGET_ASM_SELECT_SECTION. */
6244 have_global_bss_p (void)
6246 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6249 /* Output assembly to switch to section NAME with attribute FLAGS.
6250 Four variants for common object file formats. */
6253 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6254 unsigned int flags ATTRIBUTE_UNUSED
,
6255 tree decl ATTRIBUTE_UNUSED
)
6257 /* Some object formats don't support named sections at all. The
6258 front-end should already have flagged this as an error. */
6262 #ifndef TLS_SECTION_ASM_FLAG
6263 #define TLS_SECTION_ASM_FLAG 'T'
6267 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6268 tree decl ATTRIBUTE_UNUSED
)
6270 char flagchars
[10], *f
= flagchars
;
6272 /* If we have already declared this section, we can use an
6273 abbreviated form to switch back to it -- unless this section is
6274 part of a COMDAT groups, in which case GAS requires the full
6275 declaration every time. */
6276 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6277 && (flags
& SECTION_DECLARED
))
6279 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6283 if (!(flags
& SECTION_DEBUG
))
6285 #if defined (HAVE_GAS_SECTION_EXCLUDE) && HAVE_GAS_SECTION_EXCLUDE == 1
6286 if (flags
& SECTION_EXCLUDE
)
6289 if (flags
& SECTION_WRITE
)
6291 if (flags
& SECTION_CODE
)
6293 if (flags
& SECTION_SMALL
)
6295 if (flags
& SECTION_MERGE
)
6297 if (flags
& SECTION_STRINGS
)
6299 if (flags
& SECTION_TLS
)
6300 *f
++ = TLS_SECTION_ASM_FLAG
;
6301 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6305 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6307 if (!(flags
& SECTION_NOTYPE
))
6312 if (flags
& SECTION_BSS
)
6318 /* On platforms that use "@" as the assembly comment character,
6320 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6322 fprintf (asm_out_file
, format
, type
);
6324 if (flags
& SECTION_ENTSIZE
)
6325 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6326 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6328 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6329 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6331 fprintf (asm_out_file
, ",%s,comdat",
6332 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6336 putc ('\n', asm_out_file
);
6340 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6341 tree decl ATTRIBUTE_UNUSED
)
6343 char flagchars
[8], *f
= flagchars
;
6345 if (flags
& SECTION_WRITE
)
6347 if (flags
& SECTION_CODE
)
6351 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6355 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6358 default_coff_asm_named_section (name
, flags
, decl
);
6360 if (flags
& SECTION_LINKONCE
)
6362 /* Functions may have been compiled at various levels of
6363 optimization so we can't use `same_size' here.
6364 Instead, have the linker pick one. */
6365 fprintf (asm_out_file
, "\t.linkonce %s\n",
6366 (flags
& SECTION_CODE
? "discard" : "same_size"));
6370 /* The lame default section selector. */
6373 default_select_section (tree decl
, int reloc
,
6374 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6378 if (decl_readonly_section (decl
, reloc
))
6379 return readonly_data_section
;
6381 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6383 if (! ((flag_pic
&& reloc
)
6384 || !TREE_READONLY (decl
)
6385 || TREE_SIDE_EFFECTS (decl
)
6386 || !TREE_CONSTANT (decl
)))
6387 return readonly_data_section
;
6389 else if (TREE_CODE (decl
) == STRING_CST
)
6390 return readonly_data_section
;
6391 else if (! (flag_pic
&& reloc
))
6392 return readonly_data_section
;
6394 return data_section
;
6397 enum section_category
6398 categorize_decl_for_section (const_tree decl
, int reloc
)
6400 enum section_category ret
;
6402 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6404 else if (TREE_CODE (decl
) == STRING_CST
)
6406 if ((flag_sanitize
& SANITIZE_ADDRESS
)
6407 && asan_protect_global (CONST_CAST_TREE (decl
)))
6408 /* or !flag_merge_constants */
6409 return SECCAT_RODATA
;
6411 return SECCAT_RODATA_MERGE_STR
;
6413 else if (TREE_CODE (decl
) == VAR_DECL
)
6415 if (bss_initializer_p (decl
))
6417 else if (! TREE_READONLY (decl
)
6418 || TREE_SIDE_EFFECTS (decl
)
6419 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6421 /* Here the reloc_rw_mask is not testing whether the section should
6422 be read-only or not, but whether the dynamic link will have to
6423 do something. If so, we wish to segregate the data in order to
6424 minimize cache misses inside the dynamic linker. */
6425 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6426 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6430 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6431 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6432 else if (reloc
|| flag_merge_constants
< 2
6433 || ((flag_sanitize
& SANITIZE_ADDRESS
)
6434 && asan_protect_global (CONST_CAST_TREE (decl
))))
6435 /* C and C++ don't allow different variables to share the same
6436 location. -fmerge-all-constants allows even that (at the
6437 expense of not conforming). */
6438 ret
= SECCAT_RODATA
;
6439 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6440 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6442 ret
= SECCAT_RODATA_MERGE_CONST
;
6444 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6446 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6447 || TREE_SIDE_EFFECTS (decl
)
6448 || ! TREE_CONSTANT (decl
))
6451 ret
= SECCAT_RODATA
;
6454 ret
= SECCAT_RODATA
;
6456 /* There are no read-only thread-local sections. */
6457 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6459 /* Note that this would be *just* SECCAT_BSS, except that there's
6460 no concept of a read-only thread-local-data section. */
6461 if (ret
== SECCAT_BSS
6462 || (flag_zero_initialized_in_bss
6463 && initializer_zerop (DECL_INITIAL (decl
))))
6469 /* If the target uses small data sections, select it. */
6470 else if (targetm
.in_small_data_p (decl
))
6472 if (ret
== SECCAT_BSS
)
6474 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6475 ret
= SECCAT_SRODATA
;
6484 decl_readonly_section_1 (enum section_category category
)
6489 case SECCAT_RODATA_MERGE_STR
:
6490 case SECCAT_RODATA_MERGE_STR_INIT
:
6491 case SECCAT_RODATA_MERGE_CONST
:
6492 case SECCAT_SRODATA
:
6500 decl_readonly_section (const_tree decl
, int reloc
)
6502 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6505 /* Select a section based on the above categorization. */
6508 default_elf_select_section (tree decl
, int reloc
,
6509 unsigned HOST_WIDE_INT align
)
6512 switch (categorize_decl_for_section (decl
, reloc
))
6515 /* We're not supposed to be called on FUNCTION_DECLs. */
6518 return readonly_data_section
;
6519 case SECCAT_RODATA_MERGE_STR
:
6520 return mergeable_string_section (decl
, align
, 0);
6521 case SECCAT_RODATA_MERGE_STR_INIT
:
6522 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6523 case SECCAT_RODATA_MERGE_CONST
:
6524 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6525 case SECCAT_SRODATA
:
6529 return data_section
;
6530 case SECCAT_DATA_REL
:
6531 sname
= ".data.rel";
6533 case SECCAT_DATA_REL_LOCAL
:
6534 sname
= ".data.rel.local";
6536 case SECCAT_DATA_REL_RO
:
6537 sname
= ".data.rel.ro";
6539 case SECCAT_DATA_REL_RO_LOCAL
:
6540 sname
= ".data.rel.ro.local";
6563 return get_named_section (decl
, sname
, reloc
);
6566 /* Construct a unique section name based on the decl name and the
6567 categorization performed above. */
6570 default_unique_section (tree decl
, int reloc
)
6572 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6573 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6574 const char *prefix
, *name
, *linkonce
;
6578 switch (categorize_decl_for_section (decl
, reloc
))
6581 prefix
= one_only
? ".t" : ".text";
6584 case SECCAT_RODATA_MERGE_STR
:
6585 case SECCAT_RODATA_MERGE_STR_INIT
:
6586 case SECCAT_RODATA_MERGE_CONST
:
6587 prefix
= one_only
? ".r" : ".rodata";
6589 case SECCAT_SRODATA
:
6590 prefix
= one_only
? ".s2" : ".sdata2";
6593 prefix
= one_only
? ".d" : ".data";
6595 case SECCAT_DATA_REL
:
6596 prefix
= one_only
? ".d.rel" : ".data.rel";
6598 case SECCAT_DATA_REL_LOCAL
:
6599 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6601 case SECCAT_DATA_REL_RO
:
6602 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6604 case SECCAT_DATA_REL_RO_LOCAL
:
6605 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6608 prefix
= one_only
? ".s" : ".sdata";
6611 prefix
= one_only
? ".b" : ".bss";
6614 prefix
= one_only
? ".sb" : ".sbss";
6617 prefix
= one_only
? ".td" : ".tdata";
6620 prefix
= one_only
? ".tb" : ".tbss";
6626 id
= DECL_ASSEMBLER_NAME (decl
);
6627 ultimate_transparent_alias_target (&id
);
6628 name
= IDENTIFIER_POINTER (id
);
6629 name
= targetm
.strip_name_encoding (name
);
6631 /* If we're using one_only, then there needs to be a .gnu.linkonce
6632 prefix to the section name. */
6633 linkonce
= one_only
? ".gnu.linkonce" : "";
6635 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6637 set_decl_section_name (decl
, string
);
6640 /* Subroutine of compute_reloc_for_rtx for leaf rtxes. */
6643 compute_reloc_for_rtx_1 (const_rtx x
)
6645 switch (GET_CODE (x
))
6648 return SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6656 /* Like compute_reloc_for_constant, except for an RTX. The return value
6657 is a mask for which bit 1 indicates a global relocation, and bit 0
6658 indicates a local relocation. */
6661 compute_reloc_for_rtx (const_rtx x
)
6663 switch (GET_CODE (x
))
6667 return compute_reloc_for_rtx_1 (x
);
6672 subrtx_iterator::array_type array
;
6673 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
6674 reloc
|= compute_reloc_for_rtx_1 (*iter
);
6684 default_select_rtx_section (machine_mode mode ATTRIBUTE_UNUSED
,
6686 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6688 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6689 return data_section
;
6691 return readonly_data_section
;
6695 default_elf_select_rtx_section (machine_mode mode
, rtx x
,
6696 unsigned HOST_WIDE_INT align
)
6698 int reloc
= compute_reloc_for_rtx (x
);
6700 /* ??? Handle small data here somehow. */
6702 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6705 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6707 return get_named_section (NULL
, ".data.rel.ro", 3);
6710 return mergeable_constant_section (mode
, align
, 0);
6713 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6716 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6721 /* Careful not to prod global register variables. */
6724 symbol
= XEXP (rtl
, 0);
6725 if (GET_CODE (symbol
) != SYMBOL_REF
)
6728 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6729 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6730 flags
|= SYMBOL_FLAG_FUNCTION
;
6731 if (targetm
.binds_local_p (decl
))
6732 flags
|= SYMBOL_FLAG_LOCAL
;
6733 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6734 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6735 else if (targetm
.in_small_data_p (decl
))
6736 flags
|= SYMBOL_FLAG_SMALL
;
6737 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6738 being PUBLIC, the thing *must* be defined in this translation unit.
6739 Prevent this buglet from being propagated into rtl code as well. */
6740 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6741 flags
|= SYMBOL_FLAG_EXTERNAL
;
6743 SYMBOL_REF_FLAGS (symbol
) = flags
;
6746 /* By default, we do nothing for encode_section_info, so we need not
6747 do anything but discard the '*' marker. */
6750 default_strip_name_encoding (const char *str
)
6752 return str
+ (*str
== '*');
6755 #ifdef ASM_OUTPUT_DEF
6756 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6757 anchor relative to ".", the current section position. */
6760 default_asm_output_anchor (rtx symbol
)
6764 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6765 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6766 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6770 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6773 default_use_anchors_for_symbol_p (const_rtx symbol
)
6778 /* Don't use anchors for mergeable sections. The linker might move
6779 the objects around. */
6780 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6781 if (sect
->common
.flags
& SECTION_MERGE
)
6784 /* Don't use anchors for small data sections. The small data register
6785 acts as an anchor for such sections. */
6786 if (sect
->common
.flags
& SECTION_SMALL
)
6789 decl
= SYMBOL_REF_DECL (symbol
);
6790 if (decl
&& DECL_P (decl
))
6792 /* Don't use section anchors for decls that might be defined or
6793 usurped by other modules. */
6794 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
6797 /* Don't use section anchors for decls that will be placed in a
6798 small data section. */
6799 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6800 one above. The problem is that we only use SECTION_SMALL for
6801 sections that should be marked as small in the section directive. */
6802 if (targetm
.in_small_data_p (decl
))
6808 /* Return true when RESOLUTION indicate that symbol will be bound to the
6809 definition provided by current .o file. */
6812 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6814 return (resolution
== LDPR_PREVAILING_DEF
6815 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6816 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6819 /* Return true when RESOLUTION indicate that symbol will be bound locally
6820 within current executable or DSO. */
6823 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6825 return (resolution
== LDPR_PREVAILING_DEF
6826 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6827 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6828 || resolution
== LDPR_PREEMPTED_REG
6829 || resolution
== LDPR_PREEMPTED_IR
6830 || resolution
== LDPR_RESOLVED_IR
6831 || resolution
== LDPR_RESOLVED_EXEC
);
6834 /* COMMON_LOCAL_P is true means that the linker can guarantee that an
6835 uninitialized common symbol in the executable will still be defined
6836 (through COPY relocation) in the executable. */
6839 default_binds_local_p_3 (const_tree exp
, bool shlib
, bool weak_dominate
,
6840 bool extern_protected_data
, bool common_local_p
)
6842 /* A non-decl is an entry in the constant pool. */
6846 /* Weakrefs may not bind locally, even though the weakref itself is always
6847 static and therefore local. Similarly, the resolver for ifunc functions
6848 might resolve to a non-local function.
6849 FIXME: We can resolve the weakref case more curefuly by looking at the
6851 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6852 || (TREE_CODE (exp
) == FUNCTION_DECL
6853 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6856 /* Static variables are always local. */
6857 if (! TREE_PUBLIC (exp
))
6860 /* With resolution file in hand, take look into resolutions.
6861 We can't just return true for resolved_locally symbols,
6862 because dynamic linking might overwrite symbols
6863 in shared libraries. */
6864 bool resolved_locally
= false;
6866 bool uninited_common
= (DECL_COMMON (exp
)
6867 && (DECL_INITIAL (exp
) == NULL
6869 && DECL_INITIAL (exp
) == error_mark_node
)));
6871 /* A non-external variable is defined locally only if it isn't
6872 uninitialized COMMON variable or common_local_p is true. */
6873 bool defined_locally
= (!DECL_EXTERNAL (exp
)
6874 && (!uninited_common
|| common_local_p
));
6875 if (symtab_node
*node
= symtab_node::get (exp
))
6877 if (node
->in_other_partition
)
6878 defined_locally
= true;
6879 if (resolution_to_local_definition_p (node
->resolution
))
6880 defined_locally
= resolved_locally
= true;
6881 else if (resolution_local_p (node
->resolution
))
6882 resolved_locally
= true;
6884 if (defined_locally
&& weak_dominate
&& !shlib
)
6885 resolved_locally
= true;
6887 /* Undefined weak symbols are never defined locally. */
6888 if (DECL_WEAK (exp
) && !defined_locally
)
6891 /* A symbol is local if the user has said explicitly that it will be,
6892 or if we have a definition for the symbol. We cannot infer visibility
6893 for undefined symbols. */
6894 if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
6895 && (TREE_CODE (exp
) == FUNCTION_DECL
6896 || !extern_protected_data
6897 || DECL_VISIBILITY (exp
) != VISIBILITY_PROTECTED
)
6898 && (DECL_VISIBILITY_SPECIFIED (exp
) || defined_locally
))
6901 /* If PIC, then assume that any global name can be overridden by
6902 symbols resolved from other modules. */
6906 /* Variables defined outside this object might not be local. */
6907 if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6910 /* Non-dominant weak symbols are not defined locally. */
6911 if (DECL_WEAK (exp
) && !resolved_locally
)
6914 /* Uninitialized COMMON variable may be unified with symbols
6915 resolved from other modules. */
6916 if (uninited_common
&& !resolved_locally
)
6919 /* Otherwise we're left with initialized (or non-common) global data
6920 which is of necessity defined locally. */
6924 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6925 wrt cross-module name binding. */
6928 default_binds_local_p (const_tree exp
)
6930 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, false, false);
6933 /* Similar to default_binds_local_p, but common symbol may be local. */
6936 default_binds_local_p_2 (const_tree exp
)
6938 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, false,
6943 default_binds_local_p_1 (const_tree exp
, int shlib
)
6945 return default_binds_local_p_3 (exp
, shlib
!= 0, false, false, false);
6948 /* Return true when references to DECL must bind to current definition in
6951 The condition is usually equivalent to whether the function binds to the
6952 current module (shared library or executable), that is to binds_local_p.
6953 We use this fact to avoid need for another target hook and implement
6954 the logic using binds_local_p and just special cases where
6955 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6956 the weak definitions (that can be overwritten at linktime by other
6957 definition from different object file) and when resolution info is available
6958 we simply use the knowledge passed to us by linker plugin. */
6960 decl_binds_to_current_def_p (const_tree decl
)
6962 gcc_assert (DECL_P (decl
));
6963 if (!targetm
.binds_local_p (decl
))
6965 if (!TREE_PUBLIC (decl
))
6968 /* When resolution is available, just use it. */
6969 if (symtab_node
*node
= symtab_node::get (decl
))
6971 if (node
->resolution
!= LDPR_UNKNOWN
)
6972 return resolution_to_local_definition_p (node
->resolution
);
6975 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6976 binds locally but still can be overwritten), DECL_COMMON (can be merged
6977 with a non-common definition somewhere in the same module) or
6979 This rely on fact that binds_local_p behave as decl_replaceable_p
6980 for all other declaration types. */
6981 if (DECL_WEAK (decl
))
6983 if (DECL_COMMON (decl
)
6984 && (DECL_INITIAL (decl
) == NULL
6985 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6987 if (DECL_EXTERNAL (decl
))
6992 /* A replaceable function or variable is one which may be replaced
6993 at link-time with an entirely different definition, provided that the
6994 replacement has the same type. For example, functions declared
6995 with __attribute__((weak)) on most systems are replaceable.
6997 COMDAT functions are not replaceable, since all definitions of the
6998 function must be equivalent. It is important that COMDAT functions
6999 not be treated as replaceable so that use of C++ template
7000 instantiations is not penalized. */
7003 decl_replaceable_p (tree decl
)
7005 gcc_assert (DECL_P (decl
));
7006 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
7008 if (!flag_semantic_interposition
7009 && !DECL_WEAK (decl
))
7011 return !decl_binds_to_current_def_p (decl
);
7014 /* Default function to output code that will globalize a label. A
7015 target must define GLOBAL_ASM_OP or provide its own function to
7016 globalize a label. */
7017 #ifdef GLOBAL_ASM_OP
7019 default_globalize_label (FILE * stream
, const char *name
)
7021 fputs (GLOBAL_ASM_OP
, stream
);
7022 assemble_name (stream
, name
);
7023 putc ('\n', stream
);
7025 #endif /* GLOBAL_ASM_OP */
7027 /* Default function to output code that will globalize a declaration. */
7029 default_globalize_decl_name (FILE * stream
, tree decl
)
7031 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
7032 targetm
.asm_out
.globalize_label (stream
, name
);
7035 /* Default function to output a label for unwind information. The
7036 default is to do nothing. A target that needs nonlocal labels for
7037 unwind information must provide its own function to do this. */
7039 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
7040 tree decl ATTRIBUTE_UNUSED
,
7041 int for_eh ATTRIBUTE_UNUSED
,
7042 int empty ATTRIBUTE_UNUSED
)
7046 /* Default function to output a label to divide up the exception table.
7047 The default is to do nothing. A target that needs/wants to divide
7048 up the table must provide it's own function to do this. */
7050 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
7054 /* This is how to output an internal numbered label where PREFIX is
7055 the class of label and LABELNO is the number within the class. */
7058 default_generate_internal_label (char *buf
, const char *prefix
,
7059 unsigned long labelno
)
7061 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7064 /* This is how to output an internal numbered label where PREFIX is
7065 the class of label and LABELNO is the number within the class. */
7068 default_internal_label (FILE *stream
, const char *prefix
,
7069 unsigned long labelno
)
7071 char *const buf
= (char *) alloca (40 + strlen (prefix
));
7072 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7073 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
7077 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
7080 default_asm_declare_constant_name (FILE *file
, const char *name
,
7081 const_tree exp ATTRIBUTE_UNUSED
,
7082 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
7084 assemble_label (file
, name
);
7087 /* This is the default behavior at the beginning of a file. It's
7088 controlled by two other target-hook toggles. */
7090 default_file_start (void)
7092 if (targetm
.asm_file_start_app_off
7093 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
7094 fputs (ASM_APP_OFF
, asm_out_file
);
7096 if (targetm
.asm_file_start_file_directive
)
7098 /* LTO produced units have no meaningful main_input_filename. */
7100 output_file_directive (asm_out_file
, "<artificial>");
7102 output_file_directive (asm_out_file
, main_input_filename
);
7106 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
7107 which emits a special section directive used to indicate whether or
7108 not this object file needs an executable stack. This is primarily
7109 a GNU extension to ELF but could be used on other targets. */
7111 int trampolines_created
;
7114 file_end_indicate_exec_stack (void)
7116 unsigned int flags
= SECTION_DEBUG
;
7117 if (trampolines_created
)
7118 flags
|= SECTION_CODE
;
7120 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
7123 /* Emit a special section directive to indicate that this object file
7124 was compiled with -fsplit-stack. This is used to let the linker
7125 detect calls between split-stack code and non-split-stack code, so
7126 that it can modify the split-stack code to allocate a sufficiently
7127 large stack. We emit another special section if there are any
7128 functions in this file which have the no_split_stack attribute, to
7129 prevent the linker from warning about being unable to convert the
7130 functions if they call non-split-stack code. */
7133 file_end_indicate_split_stack (void)
7135 if (flag_split_stack
)
7137 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
7139 if (saw_no_split_stack
)
7140 switch_to_section (get_section (".note.GNU-no-split-stack",
7141 SECTION_DEBUG
, NULL
));
7145 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
7146 a get_unnamed_section callback. */
7149 output_section_asm_op (const void *directive
)
7151 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
7154 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
7155 the current section is NEW_SECTION. */
7158 switch_to_section (section
*new_section
)
7160 if (in_section
== new_section
)
7163 if (new_section
->common
.flags
& SECTION_FORGET
)
7166 in_section
= new_section
;
7168 switch (SECTION_STYLE (new_section
))
7171 targetm
.asm_out
.named_section (new_section
->named
.name
,
7172 new_section
->named
.common
.flags
,
7173 new_section
->named
.decl
);
7176 case SECTION_UNNAMED
:
7177 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
7180 case SECTION_NOSWITCH
:
7185 new_section
->common
.flags
|= SECTION_DECLARED
;
7188 /* If block symbol SYMBOL has not yet been assigned an offset, place
7189 it at the end of its block. */
7192 place_block_symbol (rtx symbol
)
7194 unsigned HOST_WIDE_INT size
, mask
, offset
;
7195 struct constant_descriptor_rtx
*desc
;
7196 unsigned int alignment
;
7197 struct object_block
*block
;
7200 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7201 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7204 /* Work out the symbol's size and alignment. */
7205 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7207 desc
= SYMBOL_REF_CONSTANT (symbol
);
7208 alignment
= desc
->align
;
7209 size
= GET_MODE_SIZE (desc
->mode
);
7211 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7213 decl
= SYMBOL_REF_DECL (symbol
);
7214 gcc_checking_assert (DECL_IN_CONSTANT_POOL (decl
));
7215 alignment
= DECL_ALIGN (decl
);
7216 size
= get_constant_size (DECL_INITIAL (decl
));
7217 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7218 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7219 && asan_protect_global (DECL_INITIAL (decl
)))
7220 size
+= asan_red_zone_size (size
);
7224 struct symtab_node
*snode
;
7225 decl
= SYMBOL_REF_DECL (symbol
);
7227 snode
= symtab_node::get (decl
);
7230 rtx target
= DECL_RTL (snode
->ultimate_alias_target ()->decl
);
7232 gcc_assert (MEM_P (target
)
7233 && GET_CODE (XEXP (target
, 0)) == SYMBOL_REF
7234 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (target
, 0)));
7235 target
= XEXP (target
, 0);
7236 place_block_symbol (target
);
7237 SYMBOL_REF_BLOCK_OFFSET (symbol
) = SYMBOL_REF_BLOCK_OFFSET (target
);
7240 alignment
= get_variable_align (decl
);
7241 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7242 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7243 && asan_protect_global (decl
))
7245 size
+= asan_red_zone_size (size
);
7246 alignment
= MAX (alignment
,
7247 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7251 /* Calculate the object's offset from the start of the block. */
7252 block
= SYMBOL_REF_BLOCK (symbol
);
7253 mask
= alignment
/ BITS_PER_UNIT
- 1;
7254 offset
= (block
->size
+ mask
) & ~mask
;
7255 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7257 /* Record the block's new alignment and size. */
7258 block
->alignment
= MAX (block
->alignment
, alignment
);
7259 block
->size
= offset
+ size
;
7261 vec_safe_push (block
->objects
, symbol
);
7264 /* Return the anchor that should be used to address byte offset OFFSET
7265 from the first object in BLOCK. MODEL is the TLS model used
7269 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7270 enum tls_model model
)
7273 unsigned int begin
, middle
, end
;
7274 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7277 /* Work out the anchor's offset. Use an offset of 0 for the first
7278 anchor so that we don't pessimize the case where we take the address
7279 of a variable at the beginning of the block. This is particularly
7280 useful when a block has only one variable assigned to it.
7282 We try to place anchors RANGE bytes apart, so there can then be
7283 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7284 a ptr_mode offset. With some target settings, the lowest such
7285 anchor might be out of range for the lowest ptr_mode offset;
7286 likewise the highest anchor for the highest offset. Use anchors
7287 at the extreme ends of the ptr_mode range in such cases.
7289 All arithmetic uses unsigned integers in order to avoid
7291 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7292 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7293 range
= max_offset
- min_offset
+ 1;
7298 bias
= HOST_WIDE_INT_1U
<< (GET_MODE_BITSIZE (ptr_mode
) - 1);
7301 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7302 delta
-= delta
% range
;
7305 offset
= (HOST_WIDE_INT
) (-delta
);
7309 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7310 delta
-= delta
% range
;
7311 if (delta
> bias
- 1)
7313 offset
= (HOST_WIDE_INT
) delta
;
7317 /* Do a binary search to see if there's already an anchor we can use.
7318 Set BEGIN to the new anchor's index if not. */
7320 end
= vec_safe_length (block
->anchors
);
7321 while (begin
!= end
)
7323 middle
= (end
+ begin
) / 2;
7324 anchor
= (*block
->anchors
)[middle
];
7325 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7327 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7329 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7331 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7337 /* Create a new anchor with a unique label. */
7338 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7339 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7340 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7341 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7343 /* Insert it at index BEGIN. */
7344 vec_safe_insert (block
->anchors
, begin
, anchor
);
7348 /* Output the objects in BLOCK. */
7351 output_object_block (struct object_block
*block
)
7353 struct constant_descriptor_rtx
*desc
;
7355 HOST_WIDE_INT offset
;
7359 if (!block
->objects
)
7362 /* Switch to the section and make sure that the first byte is
7363 suitably aligned. */
7364 switch_to_section (block
->sect
);
7365 assemble_align (block
->alignment
);
7367 /* Define the values of all anchors relative to the current section
7369 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7370 targetm
.asm_out
.output_anchor (symbol
);
7372 /* Output the objects themselves. */
7374 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7376 /* Move to the object's offset, padding with zeros if necessary. */
7377 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7378 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7379 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7381 desc
= SYMBOL_REF_CONSTANT (symbol
);
7382 /* Pass 1 for align as we have already laid out everything in the block.
7383 So aligning shouldn't be necessary. */
7384 output_constant_pool_1 (desc
, 1);
7385 offset
+= GET_MODE_SIZE (desc
->mode
);
7387 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7390 decl
= SYMBOL_REF_DECL (symbol
);
7391 assemble_constant_contents
7392 (DECL_INITIAL (decl
), XSTR (symbol
, 0), DECL_ALIGN (decl
));
7394 size
= get_constant_size (DECL_INITIAL (decl
));
7396 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7397 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7398 && asan_protect_global (DECL_INITIAL (decl
)))
7400 size
= asan_red_zone_size (size
);
7401 assemble_zeros (size
);
7408 decl
= SYMBOL_REF_DECL (symbol
);
7409 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7410 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7412 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7413 && asan_protect_global (decl
))
7415 size
= asan_red_zone_size (size
);
7416 assemble_zeros (size
);
7423 /* A htab_traverse callback used to call output_object_block for
7424 each member of object_block_htab. */
7427 output_object_block_htab (object_block
**slot
, void *)
7429 output_object_block (*slot
);
7433 /* Output the definitions of all object_blocks. */
7436 output_object_blocks (void)
7438 object_block_htab
->traverse
<void *, output_object_block_htab
> (NULL
);
7441 /* This function provides a possible implementation of the
7442 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7443 by -frecord-gcc-switches it creates a new mergeable, string section in the
7444 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7445 contains the switches in ASCII format.
7447 FIXME: This code does not correctly handle double quote characters
7448 that appear inside strings, (it strips them rather than preserving them).
7449 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7450 characters - instead it treats them as sub-string separators. Since
7451 we want to emit NUL strings terminators into the object file we have to use
7455 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7459 case SWITCH_TYPE_PASSED
:
7460 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7461 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7464 case SWITCH_TYPE_DESCRIPTIVE
:
7467 /* Distinguish between invocations where name is NULL. */
7468 static bool started
= false;
7474 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7478 | (SECTION_ENTSIZE
& 1),
7480 switch_to_section (sec
);
7489 /* The return value is currently ignored by the caller, but must be 0.
7490 For -fverbose-asm the return value would be the number of characters
7491 emitted into the assembler file. */
7495 /* Emit text to declare externally defined symbols. It is needed to
7496 properly support non-default visibility. */
7498 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7500 const char *name ATTRIBUTE_UNUSED
)
7502 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7503 set in order to avoid putting out names that are never really
7504 used. Always output visibility specified in the source. */
7505 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7506 && (DECL_VISIBILITY_SPECIFIED (decl
)
7507 || targetm
.binds_local_p (decl
)))
7508 maybe_assemble_visibility (decl
);
7511 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7514 default_asm_output_source_filename (FILE *file
, const char *name
)
7516 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7517 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7519 fprintf (file
, "\t.file\t");
7520 output_quoted_string (file
, name
);
7525 /* Output a file name in the form wanted by System V. */
7528 output_file_directive (FILE *asm_file
, const char *input_name
)
7533 if (input_name
== NULL
)
7534 input_name
= "<stdin>";
7536 input_name
= remap_debug_filename (input_name
);
7538 len
= strlen (input_name
);
7539 na
= input_name
+ len
;
7541 /* NA gets INPUT_NAME sans directory names. */
7542 while (na
> input_name
)
7544 if (IS_DIR_SEPARATOR (na
[-1]))
7549 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7552 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7555 make_debug_expr_from_rtl (const_rtx exp
)
7557 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7558 machine_mode mode
= GET_MODE (exp
);
7561 DECL_ARTIFICIAL (ddecl
) = 1;
7562 if (REG_P (exp
) && REG_EXPR (exp
))
7563 type
= TREE_TYPE (REG_EXPR (exp
));
7564 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7565 type
= TREE_TYPE (MEM_EXPR (exp
));
7568 if (type
&& TYPE_MODE (type
) == mode
)
7569 TREE_TYPE (ddecl
) = type
;
7571 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7572 DECL_MODE (ddecl
) = mode
;
7573 dval
= gen_rtx_DEBUG_EXPR (mode
);
7574 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7575 SET_DECL_RTL (ddecl
, dval
);
7579 #ifdef ELF_ASCII_ESCAPES
7580 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7583 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7588 fputs (STRING_ASM_OP
, f
);
7593 escape
= ELF_ASCII_ESCAPES
[c
];
7600 /* TODO: Print in hex with fast function, important for -flto. */
7601 fprintf (f
, "\\%03o", c
);
7614 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7617 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7619 const char *limit
= s
+ len
;
7620 const char *last_null
= NULL
;
7621 unsigned bytes_in_chunk
= 0;
7625 for (; s
< limit
; s
++)
7629 if (bytes_in_chunk
>= 60)
7638 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7645 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7647 if (bytes_in_chunk
> 0)
7654 default_elf_asm_output_limited_string (f
, s
);
7659 if (bytes_in_chunk
== 0)
7660 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7663 escape
= ELF_ASCII_ESCAPES
[c
];
7671 /* TODO: Print in hex with fast function, important for -flto. */
7672 fprintf (f
, "\\%03o", c
);
7673 bytes_in_chunk
+= 4;
7678 bytes_in_chunk
+= 2;
7685 if (bytes_in_chunk
> 0)
7693 static GTY(()) section
*elf_init_array_section
;
7694 static GTY(()) section
*elf_fini_array_section
;
7697 get_elf_initfini_array_priority_section (int priority
,
7701 if (priority
!= DEFAULT_INIT_PRIORITY
)
7704 sprintf (buf
, "%s.%.5u",
7705 constructor_p
? ".init_array" : ".fini_array",
7707 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7713 if (elf_init_array_section
== NULL
)
7714 elf_init_array_section
7715 = get_section (".init_array",
7716 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7717 sec
= elf_init_array_section
;
7721 if (elf_fini_array_section
== NULL
)
7722 elf_fini_array_section
7723 = get_section (".fini_array",
7724 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7725 sec
= elf_fini_array_section
;
7731 /* Use .init_array section for constructors. */
7734 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7736 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7738 assemble_addr_to_section (symbol
, sec
);
7741 /* Use .fini_array section for destructors. */
7744 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7746 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7748 assemble_addr_to_section (symbol
, sec
);
7751 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7753 This is a bit of a cheat. The real default is a no-op, but this
7754 hook is the default for all targets with a .ident directive. */
7757 default_asm_output_ident_directive (const char *ident_str
)
7759 const char *ident_asm_op
= "\t.ident\t";
7761 /* If we are still in the front end, do not write out the string
7762 to asm_out_file. Instead, add a fake top-level asm statement.
7763 This allows the front ends to use this hook without actually
7764 writing to asm_out_file, to handle #ident or Pragma Ident. */
7765 if (symtab
->state
== PARSING
)
7767 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7768 symtab
->finalize_toplevel_asm (build_string (strlen (buf
), buf
));
7771 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7774 #include "gt-varasm.h"