1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987-2016 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"
38 #include "stringpool.h"
42 #include "diagnostic-core.h"
43 #include "fold-const.h"
44 #include "stor-layout.h"
51 #include "langhooks.h"
53 #include "common/common-target.h"
57 #ifdef XCOFF_DEBUGGING_INFO
58 #include "xcoffout.h" /* Needed for external data declarations. */
61 /* The (assembler) name of the first globally-visible object output. */
62 extern GTY(()) const char *first_global_object_name
;
63 extern GTY(()) const char *weak_global_object_name
;
65 const char *first_global_object_name
;
66 const char *weak_global_object_name
;
69 struct constant_descriptor_rtx
;
70 struct rtx_constant_pool
;
72 #define n_deferred_constants (crtl->varasm.deferred_constants)
74 /* Number for making the label on the next
75 constant that is stored in memory. */
77 static GTY(()) int const_labelno
;
79 /* Carry information from ASM_DECLARE_OBJECT_NAME
80 to ASM_FINISH_DECLARE_OBJECT. */
82 int size_directive_output
;
84 /* The last decl for which assemble_variable was called,
85 if it did ASM_DECLARE_OBJECT_NAME.
86 If the last call to assemble_variable didn't do that,
89 tree last_assemble_variable_decl
;
91 /* The following global variable indicates if the first basic block
92 in a function belongs to the cold partition or not. */
94 bool first_function_block_is_cold
;
96 /* Whether we saw any functions with no_split_stack. */
98 static bool saw_no_split_stack
;
100 static const char *strip_reg_name (const char *);
101 static int contains_pointers_p (tree
);
102 #ifdef ASM_OUTPUT_EXTERNAL
103 static bool incorporeal_function_p (tree
);
105 static void decode_addr_const (tree
, struct addr_const
*);
106 static hashval_t
const_hash_1 (const tree
);
107 static int compare_constant (const tree
, const tree
);
108 static void output_constant_def_contents (rtx
);
109 static void output_addressed_constants (tree
);
110 static unsigned HOST_WIDE_INT
output_constant (tree
, unsigned HOST_WIDE_INT
,
112 static void globalize_decl (tree
);
113 static bool decl_readonly_section_1 (enum section_category
);
114 #ifdef BSS_SECTION_ASM_OP
115 #ifdef ASM_OUTPUT_ALIGNED_BSS
116 static void asm_output_aligned_bss (FILE *, tree
, const char *,
117 unsigned HOST_WIDE_INT
, int)
120 #endif /* BSS_SECTION_ASM_OP */
121 static void mark_weak (tree
);
122 static void output_constant_pool (const char *, tree
);
123 static void handle_vtv_comdat_section (section
*, const_tree
);
125 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
126 section
*text_section
;
127 section
*data_section
;
128 section
*readonly_data_section
;
129 section
*sdata_section
;
130 section
*ctors_section
;
131 section
*dtors_section
;
132 section
*bss_section
;
133 section
*sbss_section
;
135 /* Various forms of common section. All are guaranteed to be nonnull. */
136 section
*tls_comm_section
;
137 section
*comm_section
;
138 section
*lcomm_section
;
140 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
142 section
*bss_noswitch_section
;
144 /* The section that holds the main exception table, when known. The section
145 is set either by the target's init_sections hook or by the first call to
146 switch_to_exception_section. */
147 section
*exception_section
;
149 /* The section that holds the DWARF2 frame unwind information, when known.
150 The section is set either by the target's init_sections hook or by the
151 first call to switch_to_eh_frame_section. */
152 section
*eh_frame_section
;
154 /* asm_out_file's current section. This is NULL if no section has yet
155 been selected or if we lose track of what the current section is. */
158 /* True if code for the current function is currently being directed
159 at the cold section. */
160 bool in_cold_section_p
;
162 /* The following global holds the "function name" for the code in the
163 cold section of a function, if hot/cold function splitting is enabled
164 and there was actually code that went into the cold section. A
165 pseudo function name is needed for the cold section of code for some
166 debugging tools that perform symbolization. */
167 tree cold_function_name
= NULL_TREE
;
169 /* A linked list of all the unnamed sections. */
170 static GTY(()) section
*unnamed_sections
;
172 /* Return a nonzero value if DECL has a section attribute. */
173 #define IN_NAMED_SECTION(DECL) \
174 (VAR_OR_FUNCTION_DECL_P (DECL) && DECL_SECTION_NAME (DECL) != NULL)
176 struct section_hasher
: ggc_ptr_hash
<section
>
178 typedef const char *compare_type
;
180 static hashval_t
hash (section
*);
181 static bool equal (section
*, const char *);
184 /* Hash table of named sections. */
185 static GTY(()) hash_table
<section_hasher
> *section_htab
;
187 struct object_block_hasher
: ggc_ptr_hash
<object_block
>
189 typedef const section
*compare_type
;
191 static hashval_t
hash (object_block
*);
192 static bool equal (object_block
*, const section
*);
195 /* A table of object_blocks, indexed by section. */
196 static GTY(()) hash_table
<object_block_hasher
> *object_block_htab
;
198 /* The next number to use for internal anchor labels. */
199 static GTY(()) int anchor_labelno
;
201 /* A pool of constants that can be shared between functions. */
202 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
204 /* Helper routines for maintaining section_htab. */
207 section_hasher::equal (section
*old
, const char *new_name
)
209 return strcmp (old
->named
.name
, new_name
) == 0;
213 section_hasher::hash (section
*old
)
215 return htab_hash_string (old
->named
.name
);
218 /* Return a hash value for section SECT. */
221 hash_section (section
*sect
)
223 if (sect
->common
.flags
& SECTION_NAMED
)
224 return htab_hash_string (sect
->named
.name
);
225 return sect
->common
.flags
;
228 /* Helper routines for maintaining object_block_htab. */
231 object_block_hasher::equal (object_block
*old
, const section
*new_section
)
233 return old
->sect
== new_section
;
237 object_block_hasher::hash (object_block
*old
)
239 return hash_section (old
->sect
);
242 /* Return a new unnamed section with the given fields. */
245 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
250 sect
= ggc_alloc
<section
> ();
251 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
252 sect
->unnamed
.callback
= callback
;
253 sect
->unnamed
.data
= data
;
254 sect
->unnamed
.next
= unnamed_sections
;
256 unnamed_sections
= sect
;
260 /* Return a SECTION_NOSWITCH section with the given fields. */
263 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
267 sect
= ggc_alloc
<section
> ();
268 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
269 sect
->noswitch
.callback
= callback
;
274 /* Return the named section structure associated with NAME. Create
275 a new section with the given fields if no such structure exists. */
278 get_section (const char *name
, unsigned int flags
, tree decl
)
280 section
*sect
, **slot
;
282 slot
= section_htab
->find_slot_with_hash (name
, htab_hash_string (name
),
284 flags
|= SECTION_NAMED
;
287 sect
= ggc_alloc
<section
> ();
288 sect
->named
.common
.flags
= flags
;
289 sect
->named
.name
= ggc_strdup (name
);
290 sect
->named
.decl
= decl
;
296 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
297 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
299 /* It is fine if one of the section flags is
300 SECTION_WRITE | SECTION_RELRO and the other has none of these
301 flags (i.e. read-only) in named sections and either the
302 section hasn't been declared yet or has been declared as writable.
303 In that case just make sure the resulting flags are
304 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
306 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
307 == (SECTION_WRITE
| SECTION_RELRO
)
308 && (sect
->common
.flags
309 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
310 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
311 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
312 || (sect
->common
.flags
& SECTION_WRITE
)))
314 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
317 /* Sanity check user variables for flag changes. */
318 if (sect
->named
.decl
!= NULL
319 && DECL_P (sect
->named
.decl
)
320 && decl
!= sect
->named
.decl
)
322 if (decl
!= NULL
&& DECL_P (decl
))
323 error ("%+D causes a section type conflict with %D",
324 decl
, sect
->named
.decl
);
326 error ("section type conflict with %D", sect
->named
.decl
);
327 inform (DECL_SOURCE_LOCATION (sect
->named
.decl
),
328 "%qD was declared here", sect
->named
.decl
);
330 else if (decl
!= NULL
&& DECL_P (decl
))
331 error ("%+D causes a section type conflict", decl
);
333 error ("section type conflict");
334 /* Make sure we don't error about one section multiple times. */
335 sect
->common
.flags
|= SECTION_OVERRIDE
;
341 /* Return true if the current compilation mode benefits from having
342 objects grouped into blocks. */
345 use_object_blocks_p (void)
347 return flag_section_anchors
;
350 /* Return the object_block structure for section SECT. Create a new
351 structure if we haven't created one already. Return null if SECT
354 static struct object_block
*
355 get_block_for_section (section
*sect
)
357 struct object_block
*block
;
363 = object_block_htab
->find_slot_with_hash (sect
, hash_section (sect
),
368 block
= ggc_cleared_alloc
<object_block
> ();
375 /* Create a symbol with label LABEL and place it at byte offset
376 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
377 is not yet known. LABEL must be a garbage-collected string. */
380 create_block_symbol (const char *label
, struct object_block
*block
,
381 HOST_WIDE_INT offset
)
386 /* Create the extended SYMBOL_REF. */
387 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
388 symbol
= (rtx
) ggc_internal_alloc (size
);
390 /* Initialize the normal SYMBOL_REF fields. */
391 memset (symbol
, 0, size
);
392 PUT_CODE (symbol
, SYMBOL_REF
);
393 PUT_MODE (symbol
, Pmode
);
394 XSTR (symbol
, 0) = label
;
395 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
397 /* Initialize the block_symbol stuff. */
398 SYMBOL_REF_BLOCK (symbol
) = block
;
399 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
404 /* Return a section with a particular name and with whatever SECTION_*
405 flags section_type_flags deems appropriate. The name of the section
406 is taken from NAME if nonnull, otherwise it is taken from DECL's
407 DECL_SECTION_NAME. DECL is the decl associated with the section
408 (see the section comment for details) and RELOC is as for
409 section_type_flags. */
412 get_named_section (tree decl
, const char *name
, int reloc
)
418 gcc_assert (decl
&& DECL_P (decl
) && DECL_SECTION_NAME (decl
));
419 name
= DECL_SECTION_NAME (decl
);
422 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
423 return get_section (name
, flags
, decl
);
426 /* Worker for resolve_unique_section. */
429 set_implicit_section (struct symtab_node
*n
, void *data ATTRIBUTE_UNUSED
)
431 n
->implicit_section
= true;
435 /* If required, set DECL_SECTION_NAME to a unique name. */
438 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
439 int flag_function_or_data_sections
)
441 if (DECL_SECTION_NAME (decl
) == NULL
442 && targetm_common
.have_named_sections
443 && (flag_function_or_data_sections
444 || DECL_COMDAT_GROUP (decl
)))
446 targetm
.asm_out
.unique_section (decl
, reloc
);
447 if (DECL_SECTION_NAME (decl
))
448 symtab_node::get (decl
)->call_for_symbol_and_aliases
449 (set_implicit_section
, NULL
, true);
453 #ifdef BSS_SECTION_ASM_OP
455 #ifdef ASM_OUTPUT_ALIGNED_BSS
457 /* Utility function for targets to use in implementing
458 ASM_OUTPUT_ALIGNED_BSS.
459 ??? It is believed that this function will work in most cases so such
460 support is localized here. */
463 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
464 const char *name
, unsigned HOST_WIDE_INT size
,
467 switch_to_section (bss_section
);
468 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
469 #ifdef ASM_DECLARE_OBJECT_NAME
470 last_assemble_variable_decl
= decl
;
471 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
473 /* Standard thing is just output label for the object. */
474 ASM_OUTPUT_LABEL (file
, name
);
475 #endif /* ASM_DECLARE_OBJECT_NAME */
476 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
481 #endif /* BSS_SECTION_ASM_OP */
483 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
484 /* Return the hot section for function DECL. Return text_section for
488 hot_function_section (tree decl
)
490 if (decl
!= NULL_TREE
491 && DECL_SECTION_NAME (decl
) != NULL
492 && targetm_common
.have_named_sections
)
493 return get_named_section (decl
, NULL
, 0);
499 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
502 When DECL_SECTION_NAME is non-NULL and it is implicit section and
503 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
504 concatenate the name with NAMED_SECTION_SUFFIX.
505 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
508 get_named_text_section (tree decl
,
509 const char *text_section_name
,
510 const char *named_section_suffix
)
512 if (decl
&& DECL_SECTION_NAME (decl
))
514 if (named_section_suffix
)
516 const char *dsn
= DECL_SECTION_NAME (decl
);
517 const char *stripped_name
;
520 name
= (char *) alloca (strlen (dsn
) + 1);
524 stripped_name
= targetm
.strip_name_encoding (name
);
526 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
527 return get_named_section (decl
, buffer
, 0);
529 else if (symtab_node::get (decl
)->implicit_section
)
533 /* Do not try to split gnu_linkonce functions. This gets somewhat
535 if (DECL_COMDAT_GROUP (decl
) && !HAVE_COMDAT_GROUP
)
537 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
538 name
= targetm
.strip_name_encoding (name
);
539 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
545 return get_named_section (decl
, text_section_name
, 0);
548 /* Choose named function section based on its frequency. */
551 default_function_section (tree decl
, enum node_frequency freq
,
552 bool startup
, bool exit
)
554 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
555 /* Old GNU linkers have buggy --gc-section support, which sometimes
556 results in .gcc_except_table* sections being garbage collected. */
558 && symtab_node::get (decl
)->implicit_section
)
562 if (!flag_reorder_functions
563 || !targetm_common
.have_named_sections
)
565 /* Startup code should go to startup subsection unless it is
566 unlikely executed (this happens especially with function splitting
567 where we can split away unnecessary parts of static constructors. */
568 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
570 /* If we do have a profile or(and) LTO phase is executed, we do not need
571 these ELF section. */
572 if (!in_lto_p
|| !flag_profile_values
)
573 return get_named_text_section (decl
, ".text.startup", NULL
);
578 /* Similarly for exit. */
579 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
580 return get_named_text_section (decl
, ".text.exit", NULL
);
582 /* Group cold functions together, similarly for hot code. */
585 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
586 return get_named_text_section (decl
, ".text.unlikely", NULL
);
587 case NODE_FREQUENCY_HOT
:
588 /* If we do have a profile or(and) LTO phase is executed, we do not need
589 these ELF section. */
590 if (!in_lto_p
|| !flag_profile_values
)
591 return get_named_text_section (decl
, ".text.hot", NULL
);
598 /* Return the section for function DECL.
600 If DECL is NULL_TREE, return the text section. We can be passed
601 NULL_TREE under some circumstances by dbxout.c at least.
603 If FORCE_COLD is true, return cold function section ignoring
604 the frequency info of cgraph_node. */
607 function_section_1 (tree decl
, bool force_cold
)
609 section
*section
= NULL
;
610 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
611 bool startup
= false, exit
= false;
615 struct cgraph_node
*node
= cgraph_node::get (decl
);
619 freq
= node
->frequency
;
620 startup
= node
->only_called_at_startup
;
621 exit
= node
->only_called_at_exit
;
625 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
627 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
628 if (decl
!= NULL_TREE
629 && DECL_SECTION_NAME (decl
) != NULL
)
631 if (targetm
.asm_out
.function_section
)
632 section
= targetm
.asm_out
.function_section (decl
, freq
,
636 return get_named_section (decl
, NULL
, 0);
639 return targetm
.asm_out
.select_section
640 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
641 symtab_node::get (decl
)->definition_alignment ());
643 if (targetm
.asm_out
.function_section
)
644 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
647 return hot_function_section (decl
);
651 /* Return the section for function DECL.
653 If DECL is NULL_TREE, return the text section. We can be passed
654 NULL_TREE under some circumstances by dbxout.c at least. */
657 function_section (tree decl
)
659 /* Handle cases where function splitting code decides
660 to put function entry point into unlikely executed section
661 despite the fact that the function itself is not cold
662 (i.e. it is called rarely but contains a hot loop that is
663 better to live in hot subsection for the code locality). */
664 return function_section_1 (decl
,
665 first_function_block_is_cold
);
668 /* Return the section for the current function, take IN_COLD_SECTION_P
672 current_function_section (void)
674 return function_section_1 (current_function_decl
, in_cold_section_p
);
677 /* Tell assembler to switch to unlikely-to-be-executed text section. */
680 unlikely_text_section (void)
682 return function_section_1 (current_function_decl
, true);
685 /* When called within a function context, return true if the function
686 has been assigned a cold text section and if SECT is that section.
687 When called outside a function context, return true if SECT is the
688 default cold section. */
691 unlikely_text_section_p (section
*sect
)
693 return sect
== function_section_1 (current_function_decl
, true);
696 /* Return the read-only data section associated with function DECL. */
699 default_function_rodata_section (tree decl
)
701 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
703 const char *name
= DECL_SECTION_NAME (decl
);
705 if (DECL_COMDAT_GROUP (decl
) && HAVE_COMDAT_GROUP
)
711 dot
= strchr (name
+ 1, '.');
714 len
= strlen (dot
) + 8;
715 rname
= (char *) alloca (len
);
717 strcpy (rname
, ".rodata");
719 return get_section (rname
, SECTION_LINKONCE
, decl
);
721 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
722 else if (DECL_COMDAT_GROUP (decl
)
723 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
725 size_t len
= strlen (name
) + 1;
726 char *rname
= (char *) alloca (len
);
728 memcpy (rname
, name
, len
);
730 return get_section (rname
, SECTION_LINKONCE
, decl
);
732 /* For .text.foo we want to use .rodata.foo. */
733 else if (flag_function_sections
&& flag_data_sections
734 && strncmp (name
, ".text.", 6) == 0)
736 size_t len
= strlen (name
) + 1;
737 char *rname
= (char *) alloca (len
+ 2);
739 memcpy (rname
, ".rodata", 7);
740 memcpy (rname
+ 7, name
+ 5, len
- 5);
741 return get_section (rname
, 0, decl
);
745 return readonly_data_section
;
748 /* Return the read-only data section associated with function DECL
749 for targets where that section should be always the single
750 readonly data section. */
753 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
755 return readonly_data_section
;
758 /* A subroutine of mergeable_string_section and mergeable_constant_section. */
761 function_mergeable_rodata_prefix (void)
763 section
*s
= targetm
.asm_out
.function_rodata_section (current_function_decl
);
764 if (SECTION_STYLE (s
) == SECTION_NAMED
)
765 return s
->named
.name
;
767 return targetm
.asm_out
.mergeable_rodata_prefix
;
770 /* Return the section to use for string merging. */
773 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
774 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
775 unsigned int flags ATTRIBUTE_UNUSED
)
779 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
780 && TREE_CODE (decl
) == STRING_CST
781 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
783 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
784 && TREE_STRING_LENGTH (decl
) >= len
)
787 unsigned int modesize
;
791 const char *prefix
= function_mergeable_rodata_prefix ();
792 char *name
= (char *) alloca (strlen (prefix
) + 30);
794 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
795 modesize
= GET_MODE_BITSIZE (mode
);
796 if (modesize
>= 8 && modesize
<= 256
797 && (modesize
& (modesize
- 1)) == 0)
799 if (align
< modesize
)
802 str
= TREE_STRING_POINTER (decl
);
803 unit
= GET_MODE_SIZE (mode
);
805 /* Check for embedded NUL characters. */
806 for (i
= 0; i
< len
; i
+= unit
)
808 for (j
= 0; j
< unit
; j
++)
809 if (str
[i
+ j
] != '\0')
816 sprintf (name
, "%s.str%d.%d", prefix
,
817 modesize
/ 8, (int) (align
/ 8));
818 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
819 return get_section (name
, flags
, NULL
);
824 return readonly_data_section
;
827 /* Return the section to use for constant merging. */
830 mergeable_constant_section (machine_mode mode ATTRIBUTE_UNUSED
,
831 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
832 unsigned int flags ATTRIBUTE_UNUSED
)
834 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
836 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
842 && (align
& (align
- 1)) == 0)
844 const char *prefix
= function_mergeable_rodata_prefix ();
845 char *name
= (char *) alloca (strlen (prefix
) + 30);
847 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
848 flags
|= (align
/ 8) | SECTION_MERGE
;
849 return get_section (name
, flags
, NULL
);
851 return readonly_data_section
;
854 /* Given NAME, a putative register name, discard any customary prefixes. */
857 strip_reg_name (const char *name
)
859 #ifdef REGISTER_PREFIX
860 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
861 name
+= strlen (REGISTER_PREFIX
);
863 if (name
[0] == '%' || name
[0] == '#')
868 /* The user has asked for a DECL to have a particular name. Set (or
869 change) it in such a way that we don't prefix an underscore to
872 set_user_assembler_name (tree decl
, const char *name
)
874 char *starred
= (char *) alloca (strlen (name
) + 2);
876 strcpy (starred
+ 1, name
);
877 symtab
->change_decl_assembler_name (decl
, get_identifier (starred
));
878 SET_DECL_RTL (decl
, NULL_RTX
);
881 /* Decode an `asm' spec for a declaration as a register name.
882 Return the register number, or -1 if nothing specified,
883 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
884 or -3 if ASMSPEC is `cc' and is not recognized,
885 or -4 if ASMSPEC is `memory' and is not recognized.
886 Accept an exact spelling or a decimal number.
887 Prefixes such as % are optional. */
890 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
892 /* Presume just one register is clobbered. */
899 /* Get rid of confusing prefixes. */
900 asmspec
= strip_reg_name (asmspec
);
902 /* Allow a decimal number as a "register name". */
903 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
904 if (! ISDIGIT (asmspec
[i
]))
906 if (asmspec
[0] != 0 && i
< 0)
909 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0 && reg_names
[i
][0])
915 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
917 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
920 #ifdef OVERLAPPING_REGISTER_NAMES
924 const char *const name
;
927 } table
[] = OVERLAPPING_REGISTER_NAMES
;
929 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
931 && ! strcmp (asmspec
, table
[i
].name
))
933 *pnregs
= table
[i
].nregs
;
934 return table
[i
].number
;
937 #endif /* OVERLAPPING_REGISTER_NAMES */
939 #ifdef ADDITIONAL_REGISTER_NAMES
941 static const struct { const char *const name
; const int number
; } table
[]
942 = ADDITIONAL_REGISTER_NAMES
;
944 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
946 && ! strcmp (asmspec
, table
[i
].name
)
947 && reg_names
[table
[i
].number
][0])
948 return table
[i
].number
;
950 #endif /* ADDITIONAL_REGISTER_NAMES */
952 if (!strcmp (asmspec
, "memory"))
955 if (!strcmp (asmspec
, "cc"))
965 decode_reg_name (const char *name
)
968 return decode_reg_name_and_count (name
, &count
);
972 /* Return true if DECL's initializer is suitable for a BSS section. */
975 bss_initializer_p (const_tree decl
)
977 return (DECL_INITIAL (decl
) == NULL
978 /* In LTO we have no errors in program; error_mark_node is used
979 to mark offlined constructors. */
980 || (DECL_INITIAL (decl
) == error_mark_node
982 || (flag_zero_initialized_in_bss
983 /* Leave constant zeroes in .rodata so they
985 && !TREE_READONLY (decl
)
986 && initializer_zerop (DECL_INITIAL (decl
))));
989 /* Compute the alignment of variable specified by DECL.
990 DONT_OUTPUT_DATA is from assemble_variable. */
993 align_variable (tree decl
, bool dont_output_data
)
995 unsigned int align
= DECL_ALIGN (decl
);
997 /* In the case for initialing an array whose length isn't specified,
998 where we have not yet been able to do the layout,
999 figure out the proper alignment now. */
1000 if (dont_output_data
&& DECL_SIZE (decl
) == 0
1001 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
1002 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
1004 /* Some object file formats have a maximum alignment which they support.
1005 In particular, a.out format supports a maximum alignment of 4. */
1006 if (align
> MAX_OFILE_ALIGNMENT
)
1008 error ("alignment of %q+D is greater than maximum object "
1009 "file alignment %d", decl
,
1010 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
1011 align
= MAX_OFILE_ALIGNMENT
;
1014 if (! DECL_USER_ALIGN (decl
))
1016 #ifdef DATA_ABI_ALIGNMENT
1017 unsigned int data_abi_align
1018 = DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1019 /* For backwards compatibility, don't assume the ABI alignment for
1021 if (! DECL_THREAD_LOCAL_P (decl
) || data_abi_align
<= BITS_PER_WORD
)
1022 align
= data_abi_align
;
1025 /* On some machines, it is good to increase alignment sometimes.
1026 But as DECL_ALIGN is used both for actually emitting the variable
1027 and for code accessing the variable as guaranteed alignment, we
1028 can only increase the alignment if it is a performance optimization
1029 if the references to it must bind to the current definition. */
1030 if (decl_binds_to_current_def_p (decl
)
1031 && !DECL_VIRTUAL_P (decl
))
1033 #ifdef DATA_ALIGNMENT
1034 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1035 /* Don't increase alignment too much for TLS variables - TLS space
1037 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1040 if (DECL_INITIAL (decl
) != 0
1041 /* In LTO we have no errors in program; error_mark_node is used
1042 to mark offlined constructors. */
1043 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1045 unsigned int const_align
1046 = CONSTANT_ALIGNMENT (DECL_INITIAL (decl
), align
);
1047 /* Don't increase alignment too much for TLS variables - TLS
1048 space is too precious. */
1049 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1050 align
= const_align
;
1055 /* Reset the alignment in case we have made it tighter, so we can benefit
1056 from it in get_pointer_alignment. */
1057 SET_DECL_ALIGN (decl
, align
);
1060 /* Return DECL_ALIGN (decl), possibly increased for optimization purposes
1061 beyond what align_variable returned. */
1064 get_variable_align (tree decl
)
1066 unsigned int align
= DECL_ALIGN (decl
);
1068 /* For user aligned vars or static vars align_variable already did
1070 if (DECL_USER_ALIGN (decl
) || !TREE_PUBLIC (decl
))
1073 #ifdef DATA_ABI_ALIGNMENT
1074 if (DECL_THREAD_LOCAL_P (decl
))
1075 align
= DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1078 /* For decls that bind to the current definition, align_variable
1079 did also everything, except for not assuming ABI required alignment
1080 of TLS variables. For other vars, increase the alignment here
1081 as an optimization. */
1082 if (!decl_binds_to_current_def_p (decl
))
1084 /* On some machines, it is good to increase alignment sometimes. */
1085 #ifdef DATA_ALIGNMENT
1086 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1087 /* Don't increase alignment too much for TLS variables - TLS space
1089 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1092 if (DECL_INITIAL (decl
) != 0
1093 /* In LTO we have no errors in program; error_mark_node is used
1094 to mark offlined constructors. */
1095 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1097 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
1099 /* Don't increase alignment too much for TLS variables - TLS space
1101 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1102 align
= const_align
;
1109 /* Return the section into which the given VAR_DECL or CONST_DECL
1110 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1111 section should be used wherever possible. */
1114 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1116 addr_space_t as
= ADDR_SPACE_GENERIC
;
1118 varpool_node
*vnode
= varpool_node::get (decl
);
1121 vnode
= vnode
->ultimate_alias_target ();
1125 if (TREE_TYPE (decl
) != error_mark_node
)
1126 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1128 /* We need the constructor to figure out reloc flag. */
1130 vnode
->get_constructor ();
1132 if (DECL_COMMON (decl
))
1134 /* If the decl has been given an explicit section name, or it resides
1135 in a non-generic address space, then it isn't common, and shouldn't
1136 be handled as such. */
1137 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1138 && ADDR_SPACE_GENERIC_P (as
));
1139 if (DECL_THREAD_LOCAL_P (decl
))
1140 return tls_comm_section
;
1141 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1142 return comm_section
;
1145 if (DECL_INITIAL (decl
) == error_mark_node
)
1146 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1147 else if (DECL_INITIAL (decl
))
1148 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1152 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1153 if (IN_NAMED_SECTION (decl
))
1155 section
*sect
= get_named_section (decl
, NULL
, reloc
);
1157 if ((sect
->common
.flags
& SECTION_BSS
) && !bss_initializer_p (decl
))
1159 error_at (DECL_SOURCE_LOCATION (decl
),
1160 "only zero initializers are allowed in section %qs",
1162 DECL_INITIAL (decl
) = error_mark_node
;
1167 if (ADDR_SPACE_GENERIC_P (as
)
1168 && !DECL_THREAD_LOCAL_P (decl
)
1169 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1170 && bss_initializer_p (decl
))
1172 if (!TREE_PUBLIC (decl
)
1173 && !((flag_sanitize
& SANITIZE_ADDRESS
)
1174 && asan_protect_global (decl
)))
1175 return lcomm_section
;
1176 if (bss_noswitch_section
)
1177 return bss_noswitch_section
;
1180 return targetm
.asm_out
.select_section (decl
, reloc
,
1181 get_variable_align (decl
));
1184 /* Return the block into which object_block DECL should be placed. */
1186 static struct object_block
*
1187 get_block_for_decl (tree decl
)
1193 /* The object must be defined in this translation unit. */
1194 if (DECL_EXTERNAL (decl
))
1197 /* There's no point using object blocks for something that is
1198 isolated by definition. */
1199 if (DECL_COMDAT_GROUP (decl
))
1203 /* We can only calculate block offsets if the decl has a known
1205 if (DECL_SIZE_UNIT (decl
) == NULL
)
1207 if (!tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
)))
1210 /* Find out which section should contain DECL. We cannot put it into
1211 an object block if it requires a standalone definition. */
1213 align_variable (decl
, 0);
1214 sect
= get_variable_section (decl
, true);
1215 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1218 return get_block_for_section (sect
);
1221 /* Make sure block symbol SYMBOL is in block BLOCK. */
1224 change_symbol_block (rtx symbol
, struct object_block
*block
)
1226 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1228 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1229 SYMBOL_REF_BLOCK (symbol
) = block
;
1233 /* Return true if it is possible to put DECL in an object_block. */
1236 use_blocks_for_decl_p (tree decl
)
1238 struct symtab_node
*snode
;
1240 /* Only data DECLs can be placed into object blocks. */
1241 if (!VAR_P (decl
) && TREE_CODE (decl
) != CONST_DECL
)
1244 /* Detect decls created by dw2_force_const_mem. Such decls are
1245 special because DECL_INITIAL doesn't specify the decl's true value.
1246 dw2_output_indirect_constants will instead call assemble_variable
1247 with dont_output_data set to 1 and then print the contents itself. */
1248 if (DECL_INITIAL (decl
) == decl
)
1251 /* If this decl is an alias, then we don't want to emit a
1254 && (snode
= symtab_node::get (decl
)) != NULL
1258 return targetm
.use_blocks_for_decl_p (decl
);
1261 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
1262 until we find an identifier that is not itself a transparent alias.
1263 Modify the alias passed to it by reference (and all aliases on the
1264 way to the ultimate target), such that they do not have to be
1265 followed again, and return the ultimate target of the alias
1269 ultimate_transparent_alias_target (tree
*alias
)
1271 tree target
= *alias
;
1273 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
1275 gcc_assert (TREE_CHAIN (target
));
1276 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
1277 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
1278 && ! TREE_CHAIN (target
));
1285 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1286 have static storage duration. In other words, it should not be an
1287 automatic variable, including PARM_DECLs.
1289 There is, however, one exception: this function handles variables
1290 explicitly placed in a particular register by the user.
1292 This is never called for PARM_DECL nodes. */
1295 make_decl_rtl (tree decl
)
1297 const char *name
= 0;
1302 /* Check that we are not being given an automatic variable. */
1303 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1304 && TREE_CODE (decl
) != RESULT_DECL
);
1306 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1307 gcc_assert (!VAR_P (decl
)
1308 || TREE_STATIC (decl
)
1309 || TREE_PUBLIC (decl
)
1310 || DECL_EXTERNAL (decl
)
1311 || DECL_REGISTER (decl
));
1313 /* And that we were not given a type or a label. */
1314 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1315 && TREE_CODE (decl
) != LABEL_DECL
);
1317 /* For a duplicate declaration, we can be called twice on the
1318 same DECL node. Don't discard the RTL already made. */
1319 if (DECL_RTL_SET_P (decl
))
1321 /* If the old RTL had the wrong mode, fix the mode. */
1322 x
= DECL_RTL (decl
);
1323 if (GET_MODE (x
) != DECL_MODE (decl
))
1324 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1326 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1329 /* ??? Another way to do this would be to maintain a hashed
1330 table of such critters. Instead of adding stuff to a DECL
1331 to give certain attributes to it, we could use an external
1332 hash map from DECL to set of attributes. */
1334 /* Let the target reassign the RTL if it wants.
1335 This is necessary, for example, when one machine specific
1336 decl attribute overrides another. */
1337 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1339 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1340 on the new decl information. */
1342 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1343 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1344 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1349 /* If this variable belongs to the global constant pool, retrieve the
1350 pre-computed RTL or recompute it in LTO mode. */
1351 if (VAR_P (decl
) && DECL_IN_CONSTANT_POOL (decl
))
1353 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1357 id
= DECL_ASSEMBLER_NAME (decl
);
1358 if (TREE_CODE (decl
) == FUNCTION_DECL
1359 && cgraph_node::get (decl
)
1360 && cgraph_node::get (decl
)->instrumentation_clone
)
1361 ultimate_transparent_alias_target (&id
);
1362 name
= IDENTIFIER_POINTER (id
);
1364 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1365 && DECL_REGISTER (decl
))
1367 error ("register name not specified for %q+D", decl
);
1369 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1371 const char *asmspec
= name
+1;
1372 machine_mode mode
= DECL_MODE (decl
);
1373 reg_number
= decode_reg_name (asmspec
);
1374 /* First detect errors in declaring global registers. */
1375 if (reg_number
== -1)
1376 error ("register name not specified for %q+D", decl
);
1377 else if (reg_number
< 0)
1378 error ("invalid register name for %q+D", decl
);
1379 else if (mode
== BLKmode
)
1380 error ("data type of %q+D isn%'t suitable for a register",
1382 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1383 error ("the register specified for %q+D cannot be accessed"
1384 " by the current target", decl
);
1385 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1386 error ("the register specified for %q+D is not general enough"
1387 " to be used as a register variable", decl
);
1388 else if (!HARD_REGNO_MODE_OK (reg_number
, mode
))
1389 error ("register specified for %q+D isn%'t suitable for data type",
1391 /* Now handle properly declared static register variables. */
1396 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1398 DECL_INITIAL (decl
) = 0;
1399 error ("global register variable has initial value");
1401 if (TREE_THIS_VOLATILE (decl
))
1402 warning (OPT_Wvolatile_register_var
,
1403 "optimization may eliminate reads and/or "
1404 "writes to register variables");
1406 /* If the user specified one of the eliminables registers here,
1407 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1408 confused with that register and be eliminated. This usage is
1409 somewhat suspect... */
1411 SET_DECL_RTL (decl
, gen_raw_REG (mode
, reg_number
));
1412 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1413 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1415 if (TREE_STATIC (decl
))
1417 /* Make this register global, so not usable for anything
1419 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1420 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1421 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1423 nregs
= hard_regno_nregs
[reg_number
][mode
];
1425 globalize_reg (decl
, reg_number
+ --nregs
);
1428 /* As a register variable, it has no section. */
1431 /* Avoid internal errors from invalid register
1433 SET_DECL_ASSEMBLER_NAME (decl
, NULL_TREE
);
1434 DECL_HARD_REGISTER (decl
) = 0;
1435 /* Also avoid SSA inconsistencies by pretending this is an external
1437 DECL_EXTERNAL (decl
) = 1;
1440 /* Now handle ordinary static variables and functions (in memory).
1441 Also handle vars declared register invalidly. */
1442 else if (name
[0] == '*')
1444 #ifdef REGISTER_PREFIX
1445 if (strlen (REGISTER_PREFIX
) != 0)
1447 reg_number
= decode_reg_name (name
);
1448 if (reg_number
>= 0 || reg_number
== -3)
1449 error ("register name given for non-register variable %q+D", decl
);
1454 /* Specifying a section attribute on a variable forces it into a
1455 non-.bss section, and thus it cannot be common. */
1456 /* FIXME: In general this code should not be necessary because
1457 visibility pass is doing the same work. But notice_global_symbol
1458 is called early and it needs to make DECL_RTL to get the name.
1459 we take care of recomputing the DECL_RTL after visibility is changed. */
1461 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
))
1462 && DECL_SECTION_NAME (decl
) != NULL
1463 && DECL_INITIAL (decl
) == NULL_TREE
1464 && DECL_COMMON (decl
))
1465 DECL_COMMON (decl
) = 0;
1467 /* Variables can't be both common and weak. */
1468 if (VAR_P (decl
) && DECL_WEAK (decl
))
1469 DECL_COMMON (decl
) = 0;
1471 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1472 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1475 machine_mode address_mode
= Pmode
;
1476 if (TREE_TYPE (decl
) != error_mark_node
)
1478 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1479 address_mode
= targetm
.addr_space
.address_mode (as
);
1481 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1483 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1484 SET_SYMBOL_REF_DECL (x
, decl
);
1486 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1487 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1488 set_mem_attributes (x
, decl
, 1);
1489 SET_DECL_RTL (decl
, x
);
1491 /* Optionally set flags or add text to the name to record information
1492 such as that it is a function name.
1493 If the name is changed, the macro ASM_OUTPUT_LABELREF
1494 will have to know how to strip this information. */
1495 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1498 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1499 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1503 make_decl_rtl_for_debug (tree decl
)
1505 unsigned int save_aliasing_flag
;
1508 if (DECL_RTL_SET_P (decl
))
1509 return DECL_RTL (decl
);
1511 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1512 call new_alias_set. If running with -fcompare-debug, sometimes
1513 we do not want to create alias sets that will throw the alias
1514 numbers off in the comparison dumps. So... clearing
1515 flag_strict_aliasing will keep new_alias_set() from creating a
1517 save_aliasing_flag
= flag_strict_aliasing
;
1518 flag_strict_aliasing
= 0;
1520 rtl
= DECL_RTL (decl
);
1521 /* Reset DECL_RTL back, as various parts of the compiler expects
1522 DECL_RTL set meaning it is actually going to be output. */
1523 SET_DECL_RTL (decl
, NULL
);
1525 flag_strict_aliasing
= save_aliasing_flag
;
1529 /* Output a string of literal assembler code
1530 for an `asm' keyword used between functions. */
1533 assemble_asm (tree string
)
1538 if (TREE_CODE (string
) == ADDR_EXPR
)
1539 string
= TREE_OPERAND (string
, 0);
1541 p
= TREE_STRING_POINTER (string
);
1542 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1545 /* Write the address of the entity given by SYMBOL to SEC. */
1547 assemble_addr_to_section (rtx symbol
, section
*sec
)
1549 switch_to_section (sec
);
1550 assemble_align (POINTER_SIZE
);
1551 assemble_integer (symbol
, POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
1554 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1555 not) section for PRIORITY. */
1557 get_cdtor_priority_section (int priority
, bool constructor_p
)
1559 /* Buffer conservatively large enough for the full range of a 32-bit
1560 int plus the text below. */
1563 /* ??? This only works reliably with the GNU linker. */
1564 sprintf (buf
, "%s.%.5u",
1565 constructor_p
? ".ctors" : ".dtors",
1566 /* Invert the numbering so the linker puts us in the proper
1567 order; constructors are run from right to left, and the
1568 linker sorts in increasing order. */
1569 MAX_INIT_PRIORITY
- priority
);
1570 return get_section (buf
, SECTION_WRITE
, NULL
);
1574 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1578 if (priority
!= DEFAULT_INIT_PRIORITY
)
1579 sec
= get_cdtor_priority_section (priority
,
1580 /*constructor_p=*/false);
1582 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1584 assemble_addr_to_section (symbol
, sec
);
1587 #ifdef DTORS_SECTION_ASM_OP
1589 default_dtor_section_asm_out_destructor (rtx symbol
,
1590 int priority ATTRIBUTE_UNUSED
)
1592 assemble_addr_to_section (symbol
, dtors_section
);
1597 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1601 if (priority
!= DEFAULT_INIT_PRIORITY
)
1602 sec
= get_cdtor_priority_section (priority
,
1603 /*constructor_p=*/true);
1605 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1607 assemble_addr_to_section (symbol
, sec
);
1610 #ifdef CTORS_SECTION_ASM_OP
1612 default_ctor_section_asm_out_constructor (rtx symbol
,
1613 int priority ATTRIBUTE_UNUSED
)
1615 assemble_addr_to_section (symbol
, ctors_section
);
1619 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1620 a nonzero value if the constant pool should be output before the
1621 start of the function, or a zero value if the pool should output
1622 after the end of the function. The default is to put it before the
1625 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1626 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1629 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1630 to be output to assembler.
1631 Set first_global_object_name and weak_global_object_name as appropriate. */
1634 notice_global_symbol (tree decl
)
1636 const char **t
= &first_global_object_name
;
1638 if (first_global_object_name
1639 || !TREE_PUBLIC (decl
)
1640 || DECL_EXTERNAL (decl
)
1641 || !DECL_NAME (decl
)
1642 || (VAR_P (decl
) && DECL_HARD_REGISTER (decl
))
1643 || (TREE_CODE (decl
) != FUNCTION_DECL
1645 || (DECL_COMMON (decl
)
1646 && (DECL_INITIAL (decl
) == 0
1647 || DECL_INITIAL (decl
) == error_mark_node
)))))
1650 /* We win when global object is found, but it is useful to know about weak
1651 symbol as well so we can produce nicer unique names. */
1652 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1653 t
= &weak_global_object_name
;
1657 tree id
= DECL_ASSEMBLER_NAME (decl
);
1658 ultimate_transparent_alias_target (&id
);
1659 *t
= ggc_strdup (targetm
.strip_name_encoding (IDENTIFIER_POINTER (id
)));
1663 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1664 current function goes into the cold section, so that targets can use
1665 current_function_section during RTL expansion. DECL describes the
1669 decide_function_section (tree decl
)
1671 first_function_block_is_cold
= false;
1673 if (flag_reorder_blocks_and_partition
)
1674 /* We will decide in assemble_start_function. */
1677 if (DECL_SECTION_NAME (decl
))
1679 struct cgraph_node
*node
= cgraph_node::get (current_function_decl
);
1680 /* Calls to function_section rely on first_function_block_is_cold
1682 first_function_block_is_cold
= (node
1684 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1687 in_cold_section_p
= first_function_block_is_cold
;
1690 /* Get the function's name, as described by its RTL. This may be
1691 different from the DECL_NAME name used in the source file. */
1693 get_fnname_from_decl (tree decl
)
1695 rtx x
= DECL_RTL (decl
);
1696 gcc_assert (MEM_P (x
));
1698 gcc_assert (GET_CODE (x
) == SYMBOL_REF
);
1702 /* Output assembler code for the constant pool of a function and associated
1703 with defining the name of the function. DECL describes the function.
1704 NAME is the function's name. For the constant pool, we use the current
1705 constant pool data. */
1708 assemble_start_function (tree decl
, const char *fnname
)
1711 char tmp_label
[100];
1712 bool hot_label_written
= false;
1714 if (flag_reorder_blocks_and_partition
)
1716 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1717 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1718 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1719 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1720 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1721 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1722 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1723 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1725 cold_function_name
= NULL_TREE
;
1729 crtl
->subsections
.hot_section_label
= NULL
;
1730 crtl
->subsections
.cold_section_label
= NULL
;
1731 crtl
->subsections
.hot_section_end_label
= NULL
;
1732 crtl
->subsections
.cold_section_end_label
= NULL
;
1735 /* The following code does not need preprocessing in the assembler. */
1739 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1740 output_constant_pool (fnname
, decl
);
1742 align
= symtab_node::get (decl
)->definition_alignment ();
1744 /* Make sure the not and cold text (code) sections are properly
1745 aligned. This is necessary here in the case where the function
1746 has both hot and cold sections, because we don't want to re-set
1747 the alignment when the section switch happens mid-function. */
1749 if (flag_reorder_blocks_and_partition
)
1751 first_function_block_is_cold
= false;
1753 switch_to_section (unlikely_text_section ());
1754 assemble_align (align
);
1755 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1757 /* When the function starts with a cold section, we need to explicitly
1758 align the hot section and write out the hot section label.
1759 But if the current function is a thunk, we do not have a CFG. */
1761 && BB_PARTITION (ENTRY_BLOCK_PTR_FOR_FN (cfun
)->next_bb
) == BB_COLD_PARTITION
)
1763 switch_to_section (text_section
);
1764 assemble_align (align
);
1765 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1766 hot_label_written
= true;
1767 first_function_block_is_cold
= true;
1769 in_cold_section_p
= first_function_block_is_cold
;
1773 /* Switch to the correct text section for the start of the function. */
1775 switch_to_section (function_section (decl
));
1776 if (flag_reorder_blocks_and_partition
1777 && !hot_label_written
)
1778 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1780 /* Tell assembler to move to target machine's alignment for functions. */
1781 align
= floor_log2 (align
/ BITS_PER_UNIT
);
1784 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1787 /* Handle a user-specified function alignment.
1788 Note that we still need to align to DECL_ALIGN, as above,
1789 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1790 if (! DECL_USER_ALIGN (decl
)
1791 && align_functions_log
> align
1792 && optimize_function_for_speed_p (cfun
))
1794 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1795 int align_log
= align_functions_log
;
1797 int max_skip
= align_functions
- 1;
1798 if (flag_limit_function_alignment
&& crtl
->max_insn_address
> 0
1799 && max_skip
>= crtl
->max_insn_address
)
1800 max_skip
= crtl
->max_insn_address
- 1;
1802 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1803 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
, align_log
, max_skip
);
1805 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1809 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1810 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1813 if (!DECL_IGNORED_P (decl
))
1814 (*debug_hooks
->begin_function
) (decl
);
1816 /* Make function name accessible from other files, if appropriate. */
1818 if (TREE_PUBLIC (decl
)
1819 || (cgraph_node::get (decl
)->instrumentation_clone
1820 && cgraph_node::get (decl
)->instrumented_version
1821 && TREE_PUBLIC (cgraph_node::get (decl
)->instrumented_version
->decl
)))
1823 notice_global_symbol (decl
);
1825 globalize_decl (decl
);
1827 maybe_assemble_visibility (decl
);
1830 if (DECL_PRESERVE_P (decl
))
1831 targetm
.asm_out
.mark_decl_preserved (fnname
);
1833 /* Do any machine/system dependent processing of the function name. */
1834 #ifdef ASM_DECLARE_FUNCTION_NAME
1835 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1837 /* Standard thing is just output label for the function. */
1838 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1839 #endif /* ASM_DECLARE_FUNCTION_NAME */
1841 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1842 saw_no_split_stack
= true;
1845 /* Output assembler code associated with defining the size of the
1846 function. DECL describes the function. NAME is the function's name. */
1849 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1851 #ifdef ASM_DECLARE_FUNCTION_SIZE
1852 /* We could have switched section in the middle of the function. */
1853 if (flag_reorder_blocks_and_partition
)
1854 switch_to_section (function_section (decl
));
1855 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1857 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1859 output_constant_pool (fnname
, decl
);
1860 switch_to_section (function_section (decl
)); /* need to switch back */
1862 /* Output labels for end of hot/cold text sections (to be used by
1864 if (flag_reorder_blocks_and_partition
)
1866 section
*save_text_section
;
1868 save_text_section
= in_section
;
1869 switch_to_section (unlikely_text_section ());
1870 #ifdef ASM_DECLARE_COLD_FUNCTION_SIZE
1871 if (cold_function_name
!= NULL_TREE
)
1872 ASM_DECLARE_COLD_FUNCTION_SIZE (asm_out_file
,
1873 IDENTIFIER_POINTER (cold_function_name
),
1876 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1877 if (first_function_block_is_cold
)
1878 switch_to_section (text_section
);
1880 switch_to_section (function_section (decl
));
1881 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1882 switch_to_section (save_text_section
);
1886 /* Assemble code to leave SIZE bytes of zeros. */
1889 assemble_zeros (unsigned HOST_WIDE_INT size
)
1891 /* Do no output if -fsyntax-only. */
1892 if (flag_syntax_only
)
1895 #ifdef ASM_NO_SKIP_IN_TEXT
1896 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1897 so we must output 0s explicitly in the text section. */
1898 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1900 unsigned HOST_WIDE_INT i
;
1901 for (i
= 0; i
< size
; i
++)
1902 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1907 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1910 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1913 assemble_align (int align
)
1915 if (align
> BITS_PER_UNIT
)
1917 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1921 /* Assemble a string constant with the specified C string as contents. */
1924 assemble_string (const char *p
, int size
)
1929 /* If the string is very long, split it up. */
1933 int thissize
= size
- pos
;
1934 if (thissize
> maximum
)
1937 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1945 /* A noswitch_section_callback for lcomm_section. */
1948 emit_local (tree decl ATTRIBUTE_UNUSED
,
1949 const char *name ATTRIBUTE_UNUSED
,
1950 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1951 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1953 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1954 unsigned int align
= symtab_node::get (decl
)->definition_alignment ();
1955 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1958 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1959 unsigned int align
= symtab_node::get (decl
)->definition_alignment ();
1960 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, align
);
1963 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1968 /* A noswitch_section_callback for bss_noswitch_section. */
1970 #if defined ASM_OUTPUT_ALIGNED_BSS
1972 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1973 const char *name ATTRIBUTE_UNUSED
,
1974 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1975 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1977 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
,
1978 get_variable_align (decl
));
1983 /* A noswitch_section_callback for comm_section. */
1986 emit_common (tree decl ATTRIBUTE_UNUSED
,
1987 const char *name ATTRIBUTE_UNUSED
,
1988 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1989 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1991 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1992 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1993 size
, get_variable_align (decl
));
1995 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1996 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
,
1997 get_variable_align (decl
));
2000 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
2005 /* A noswitch_section_callback for tls_comm_section. */
2008 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
2009 const char *name ATTRIBUTE_UNUSED
,
2010 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
2011 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2013 #ifdef ASM_OUTPUT_TLS_COMMON
2014 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
2017 sorry ("thread-local COMMON data not implemented");
2022 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
2023 NAME is the name of DECL's SYMBOL_REF. */
2026 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
,
2029 unsigned HOST_WIDE_INT size
, rounded
;
2031 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2034 if ((flag_sanitize
& SANITIZE_ADDRESS
) && asan_protect_global (decl
))
2035 size
+= asan_red_zone_size (size
);
2037 /* Don't allocate zero bytes of common,
2038 since that means "undefined external" in the linker. */
2042 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2043 so that each uninitialized object starts on such a boundary. */
2044 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
2045 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2046 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2048 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
2049 && (unsigned HOST_WIDE_INT
) (align
/ BITS_PER_UNIT
) > rounded
)
2050 error ("requested alignment for %q+D is greater than "
2051 "implemented alignment of %wu", decl
, rounded
);
2054 /* A subroutine of assemble_variable. Output the label and contents of
2055 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
2056 is as for assemble_variable. */
2059 assemble_variable_contents (tree decl
, const char *name
,
2060 bool dont_output_data
)
2062 /* Do any machine/system dependent processing of the object. */
2063 #ifdef ASM_DECLARE_OBJECT_NAME
2064 last_assemble_variable_decl
= decl
;
2065 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
2067 /* Standard thing is just output label for the object. */
2068 ASM_OUTPUT_LABEL (asm_out_file
, name
);
2069 #endif /* ASM_DECLARE_OBJECT_NAME */
2071 if (!dont_output_data
)
2073 /* Caller is supposed to use varpool_get_constructor when it wants
2074 to output the body. */
2075 gcc_assert (!in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
);
2076 if (DECL_INITIAL (decl
)
2077 && DECL_INITIAL (decl
) != error_mark_node
2078 && !initializer_zerop (DECL_INITIAL (decl
)))
2079 /* Output the actual data. */
2080 output_constant (DECL_INITIAL (decl
),
2081 tree_to_uhwi (DECL_SIZE_UNIT (decl
)),
2082 get_variable_align (decl
),
2085 /* Leave space for it. */
2086 assemble_zeros (tree_to_uhwi (DECL_SIZE_UNIT (decl
)));
2087 targetm
.asm_out
.decl_end ();
2091 /* Write out assembly for the variable DECL, which is not defined in
2092 the current translation unit. */
2094 assemble_undefined_decl (tree decl
)
2096 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
2097 targetm
.asm_out
.assemble_undefined_decl (asm_out_file
, name
, decl
);
2100 /* Assemble everything that is needed for a variable or function declaration.
2101 Not used for automatic variables, and not used for function definitions.
2102 Should not be called for variables of incomplete structure type.
2104 TOP_LEVEL is nonzero if this variable has file scope.
2105 AT_END is nonzero if this is the special handling, at end of compilation,
2106 to define things that have had only tentative definitions.
2107 DONT_OUTPUT_DATA if nonzero means don't actually output the
2108 initial value (that will be done by the caller). */
2111 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
2112 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
2115 rtx decl_rtl
, symbol
;
2118 bool asan_protected
= false;
2120 /* This function is supposed to handle VARIABLES. Ensure we have one. */
2121 gcc_assert (VAR_P (decl
));
2123 /* Emulated TLS had better not get this far. */
2124 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
2126 last_assemble_variable_decl
= 0;
2128 /* Normally no need to say anything here for external references,
2129 since assemble_external is called by the language-specific code
2130 when a declaration is first seen. */
2132 if (DECL_EXTERNAL (decl
))
2135 /* Do nothing for global register variables. */
2136 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
2138 TREE_ASM_WRITTEN (decl
) = 1;
2142 /* If type was incomplete when the variable was declared,
2143 see if it is complete now. */
2145 if (DECL_SIZE (decl
) == 0)
2146 layout_decl (decl
, 0);
2148 /* Still incomplete => don't allocate it; treat the tentative defn
2149 (which is what it must have been) as an `extern' reference. */
2151 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2153 error ("storage size of %q+D isn%'t known", decl
);
2154 TREE_ASM_WRITTEN (decl
) = 1;
2158 /* The first declaration of a variable that comes through this function
2159 decides whether it is global (in C, has external linkage)
2160 or local (in C, has internal linkage). So do nothing more
2161 if this function has already run. */
2163 if (TREE_ASM_WRITTEN (decl
))
2166 /* Make sure targetm.encode_section_info is invoked before we set
2168 decl_rtl
= DECL_RTL (decl
);
2170 TREE_ASM_WRITTEN (decl
) = 1;
2172 /* Do no output if -fsyntax-only. */
2173 if (flag_syntax_only
)
2176 if (! dont_output_data
2177 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
2179 error ("size of variable %q+D is too large", decl
);
2183 gcc_assert (MEM_P (decl_rtl
));
2184 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2185 symbol
= XEXP (decl_rtl
, 0);
2187 /* If this symbol belongs to the tree constant pool, output the constant
2188 if it hasn't already been written. */
2189 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
2191 tree decl
= SYMBOL_REF_DECL (symbol
);
2192 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
2193 output_constant_def_contents (symbol
);
2199 name
= XSTR (symbol
, 0);
2200 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2201 notice_global_symbol (decl
);
2203 /* Compute the alignment of this data. */
2205 align_variable (decl
, dont_output_data
);
2207 if ((flag_sanitize
& SANITIZE_ADDRESS
)
2208 && asan_protect_global (decl
))
2210 asan_protected
= true;
2211 SET_DECL_ALIGN (decl
, MAX (DECL_ALIGN (decl
),
2212 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
));
2215 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2217 align
= get_variable_align (decl
);
2219 if (TREE_PUBLIC (decl
))
2220 maybe_assemble_visibility (decl
);
2222 if (DECL_PRESERVE_P (decl
))
2223 targetm
.asm_out
.mark_decl_preserved (name
);
2225 /* First make the assembler name(s) global if appropriate. */
2226 sect
= get_variable_section (decl
, false);
2227 if (TREE_PUBLIC (decl
)
2228 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2229 globalize_decl (decl
);
2231 /* Output any data that we will need to use the address of. */
2232 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2233 output_addressed_constants (DECL_INITIAL (decl
));
2235 /* dbxout.c needs to know this. */
2236 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2237 DECL_IN_TEXT_SECTION (decl
) = 1;
2239 /* If the decl is part of an object_block, make sure that the decl
2240 has been positioned within its block, but do not write out its
2241 definition yet. output_object_blocks will do that later. */
2242 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2244 gcc_assert (!dont_output_data
);
2245 place_block_symbol (symbol
);
2247 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2248 assemble_noswitch_variable (decl
, name
, sect
, align
);
2251 /* Special-case handling of vtv comdat sections. */
2252 if (sect
->named
.name
2253 && (strcmp (sect
->named
.name
, ".vtable_map_vars") == 0))
2254 handle_vtv_comdat_section (sect
, decl
);
2256 switch_to_section (sect
);
2257 if (align
> BITS_PER_UNIT
)
2258 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
2259 assemble_variable_contents (decl
, name
, dont_output_data
);
2262 unsigned HOST_WIDE_INT
int size
2263 = tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2264 assemble_zeros (asan_red_zone_size (size
));
2270 /* Given a function declaration (FN_DECL), this function assembles the
2271 function into the .preinit_array section. */
2274 assemble_vtv_preinit_initializer (tree fn_decl
)
2277 unsigned flags
= SECTION_WRITE
;
2278 rtx symbol
= XEXP (DECL_RTL (fn_decl
), 0);
2280 flags
|= SECTION_NOTYPE
;
2281 sect
= get_section (".preinit_array", flags
, fn_decl
);
2282 switch_to_section (sect
);
2283 assemble_addr_to_section (symbol
, sect
);
2286 /* Return 1 if type TYPE contains any pointers. */
2289 contains_pointers_p (tree type
)
2291 switch (TREE_CODE (type
))
2294 case REFERENCE_TYPE
:
2295 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2296 so I'll play safe and return 1. */
2302 case QUAL_UNION_TYPE
:
2305 /* For a type that has fields, see if the fields have pointers. */
2306 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2307 if (TREE_CODE (fields
) == FIELD_DECL
2308 && contains_pointers_p (TREE_TYPE (fields
)))
2314 /* An array type contains pointers if its element type does. */
2315 return contains_pointers_p (TREE_TYPE (type
));
2322 /* We delay assemble_external processing until
2323 the compilation unit is finalized. This is the best we can do for
2324 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2325 it all the way to final. See PR 17982 for further discussion. */
2326 static GTY(()) tree pending_assemble_externals
;
2328 #ifdef ASM_OUTPUT_EXTERNAL
2329 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2330 As a result, assemble_external can be called after the list of externals
2331 is processed and the pointer set destroyed. */
2332 static bool pending_assemble_externals_processed
;
2334 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2335 TREE_LIST in assemble_external. */
2336 static hash_set
<tree
> *pending_assemble_externals_set
;
2338 /* True if DECL is a function decl for which no out-of-line copy exists.
2339 It is assumed that DECL's assembler name has been set. */
2342 incorporeal_function_p (tree decl
)
2344 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2348 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2349 && (DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
2350 || DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA_WITH_ALIGN
))
2353 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2354 /* Atomic or sync builtins which have survived this far will be
2355 resolved externally and therefore are not incorporeal. */
2356 if (strncmp (name
, "__builtin_", 10) == 0)
2362 /* Actually do the tests to determine if this is necessary, and invoke
2363 ASM_OUTPUT_EXTERNAL. */
2365 assemble_external_real (tree decl
)
2367 rtx rtl
= DECL_RTL (decl
);
2369 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2370 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2371 && !incorporeal_function_p (decl
))
2373 /* Some systems do require some output. */
2374 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2375 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2381 process_pending_assemble_externals (void)
2383 #ifdef ASM_OUTPUT_EXTERNAL
2385 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2386 assemble_external_real (TREE_VALUE (list
));
2388 pending_assemble_externals
= 0;
2389 pending_assemble_externals_processed
= true;
2390 delete pending_assemble_externals_set
;
2394 /* This TREE_LIST contains any weak symbol declarations waiting
2396 static GTY(()) tree weak_decls
;
2398 /* Output something to declare an external symbol to the assembler,
2399 and qualifiers such as weakness. (Most assemblers don't need
2400 extern declaration, so we normally output nothing.) Do nothing if
2401 DECL is not external. */
2404 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2406 /* Make sure that the ASM_OUT_FILE is open.
2407 If it's not, we should not be calling this function. */
2408 gcc_assert (asm_out_file
);
2410 /* In a perfect world, the following condition would be true.
2411 Sadly, the Java and Go front ends emit assembly *from the front end*,
2412 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2414 /* This function should only be called if we are expanding, or have
2416 Ideally, only final.c would be calling this function, but it is
2417 not clear whether that would break things somehow. See PR 17982
2418 for further discussion. */
2419 gcc_assert (state
== EXPANSION
2420 || state
== FINISHED
);
2423 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2426 /* We want to output annotation for weak and external symbols at
2427 very last to check if they are references or not. */
2429 if (TARGET_SUPPORTS_WEAK
2431 /* TREE_STATIC is a weird and abused creature which is not
2432 generally the right test for whether an entity has been
2433 locally emitted, inlined or otherwise not-really-extern, but
2434 for declarations that can be weak, it happens to be
2436 && !TREE_STATIC (decl
)
2437 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2438 && value_member (decl
, weak_decls
) == NULL_TREE
)
2439 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2441 #ifdef ASM_OUTPUT_EXTERNAL
2442 if (pending_assemble_externals_processed
)
2444 assemble_external_real (decl
);
2448 if (! pending_assemble_externals_set
->add (decl
))
2449 pending_assemble_externals
= tree_cons (NULL
, decl
,
2450 pending_assemble_externals
);
2454 /* Similar, for calling a library function FUN. */
2457 assemble_external_libcall (rtx fun
)
2459 /* Declare library function name external when first used, if nec. */
2460 if (! SYMBOL_REF_USED (fun
))
2462 SYMBOL_REF_USED (fun
) = 1;
2463 targetm
.asm_out
.external_libcall (fun
);
2467 /* Assemble a label named NAME. */
2470 assemble_label (FILE *file
, const char *name
)
2472 ASM_OUTPUT_LABEL (file
, name
);
2475 /* Set the symbol_referenced flag for ID. */
2477 mark_referenced (tree id
)
2479 TREE_SYMBOL_REFERENCED (id
) = 1;
2482 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2484 mark_decl_referenced (tree decl
)
2486 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2488 /* Extern inline functions don't become needed when referenced.
2489 If we know a method will be emitted in other TU and no new
2490 functions can be marked reachable, just use the external
2492 struct cgraph_node
*node
= cgraph_node::get_create (decl
);
2493 if (!DECL_EXTERNAL (decl
)
2494 && !node
->definition
)
2495 node
->mark_force_output ();
2497 else if (VAR_P (decl
))
2499 varpool_node
*node
= varpool_node::get_create (decl
);
2500 /* C++ frontend use mark_decl_references to force COMDAT variables
2501 to be output that might appear dead otherwise. */
2502 node
->force_output
= true;
2504 /* else do nothing - we can get various sorts of CST nodes here,
2505 which do not need to be marked. */
2509 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2510 starts with a *, the rest of NAME is output verbatim. Otherwise
2511 NAME is transformed in a target-specific way (usually by the
2512 addition of an underscore). */
2515 assemble_name_raw (FILE *file
, const char *name
)
2518 fputs (&name
[1], file
);
2520 ASM_OUTPUT_LABELREF (file
, name
);
2523 /* Like assemble_name_raw, but should be used when NAME might refer to
2524 an entity that is also represented as a tree (like a function or
2525 variable). If NAME does refer to such an entity, that entity will
2526 be marked as referenced. */
2529 assemble_name (FILE *file
, const char *name
)
2531 const char *real_name
;
2534 real_name
= targetm
.strip_name_encoding (name
);
2536 id
= maybe_get_identifier (real_name
);
2541 mark_referenced (id
);
2542 ultimate_transparent_alias_target (&id
);
2544 name
= IDENTIFIER_POINTER (id
);
2545 gcc_assert (! TREE_CHAIN (id
));
2548 assemble_name_raw (file
, name
);
2551 /* Allocate SIZE bytes writable static space with a gensym name
2552 and return an RTX to refer to its address. */
2555 assemble_static_space (unsigned HOST_WIDE_INT size
)
2558 const char *namestring
;
2561 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2563 namestring
= ggc_strdup (name
);
2565 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2566 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2568 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2569 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2572 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2573 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2576 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2577 so that each uninitialized object starts on such a boundary. */
2578 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2579 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2580 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2581 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2582 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2583 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2590 /* Assemble the static constant template for function entry trampolines.
2591 This is done at most once per compilation.
2592 Returns an RTX for the address of the template. */
2594 static GTY(()) rtx initial_trampoline
;
2597 assemble_trampoline_template (void)
2604 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2606 if (initial_trampoline
)
2607 return initial_trampoline
;
2609 /* By default, put trampoline templates in read-only data section. */
2611 #ifdef TRAMPOLINE_SECTION
2612 switch_to_section (TRAMPOLINE_SECTION
);
2614 switch_to_section (readonly_data_section
);
2617 /* Write the assembler code to define one. */
2618 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2620 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2622 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2623 targetm
.asm_out
.trampoline_template (asm_out_file
);
2625 /* Record the rtl to refer to it. */
2626 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2627 name
= ggc_strdup (label
);
2628 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2629 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2631 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2632 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2633 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2635 return initial_trampoline
;
2638 /* A and B are either alignments or offsets. Return the minimum alignment
2639 that may be assumed after adding the two together. */
2641 static inline unsigned
2642 min_align (unsigned int a
, unsigned int b
)
2644 return least_bit_hwi (a
| b
);
2647 /* Return the assembler directive for creating a given kind of integer
2648 object. SIZE is the number of bytes in the object and ALIGNED_P
2649 indicates whether it is known to be aligned. Return NULL if the
2650 assembly dialect has no such directive.
2652 The returned string should be printed at the start of a new line and
2653 be followed immediately by the object's initial value. */
2656 integer_asm_op (int size
, int aligned_p
)
2658 struct asm_int_op
*ops
;
2661 ops
= &targetm
.asm_out
.aligned_op
;
2663 ops
= &targetm
.asm_out
.unaligned_op
;
2668 return targetm
.asm_out
.byte_op
;
2682 /* Use directive OP to assemble an integer object X. Print OP at the
2683 start of the line, followed immediately by the value of X. */
2686 assemble_integer_with_op (const char *op
, rtx x
)
2688 fputs (op
, asm_out_file
);
2689 output_addr_const (asm_out_file
, x
);
2690 fputc ('\n', asm_out_file
);
2693 /* The default implementation of the asm_out.integer target hook. */
2696 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2697 unsigned int size ATTRIBUTE_UNUSED
,
2698 int aligned_p ATTRIBUTE_UNUSED
)
2700 const char *op
= integer_asm_op (size
, aligned_p
);
2701 /* Avoid GAS bugs for large values. Specifically negative values whose
2702 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2703 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE_UNITS
)
2705 return op
&& (assemble_integer_with_op (op
, x
), true);
2708 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2709 the alignment of the integer in bits. Return 1 if we were able to output
2710 the constant, otherwise 0. We must be able to output the constant,
2711 if FORCE is nonzero. */
2714 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2718 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2720 /* See if the target hook can handle this kind of object. */
2721 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2724 /* If the object is a multi-byte one, try splitting it up. Split
2725 it into words it if is multi-word, otherwise split it into bytes. */
2728 machine_mode omode
, imode
;
2729 unsigned int subalign
;
2730 unsigned int subsize
, i
;
2731 enum mode_class mclass
;
2733 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2734 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2735 if (GET_CODE (x
) == CONST_FIXED
)
2736 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2740 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2741 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2743 for (i
= 0; i
< size
; i
+= subsize
)
2745 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2746 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2752 /* If we've printed some of it, but not all of it, there's no going
2757 gcc_assert (!force
);
2762 /* Assemble the floating-point constant D into an object of size MODE. ALIGN
2763 is the alignment of the constant in bits. If REVERSE is true, D is output
2764 in reverse storage order. */
2767 assemble_real (REAL_VALUE_TYPE d
, machine_mode mode
, unsigned int align
,
2770 long data
[4] = {0, 0, 0, 0};
2771 int bitsize
, nelts
, nunits
, units_per
;
2774 /* This is hairy. We have a quantity of known size. real_to_target
2775 will put it into an array of *host* longs, 32 bits per element
2776 (even if long is more than 32 bits). We need to determine the
2777 number of array elements that are occupied (nelts) and the number
2778 of *target* min-addressable units that will be occupied in the
2779 object file (nunits). We cannot assume that 32 divides the
2780 mode's bitsize (size * BITS_PER_UNIT) evenly.
2782 size * BITS_PER_UNIT is used here to make sure that padding bits
2783 (which might appear at either end of the value; real_to_target
2784 will include the padding bits in its output array) are included. */
2786 nunits
= GET_MODE_SIZE (mode
);
2787 bitsize
= nunits
* BITS_PER_UNIT
;
2788 nelts
= CEIL (bitsize
, 32);
2789 units_per
= 32 / BITS_PER_UNIT
;
2791 real_to_target (data
, &d
, mode
);
2793 /* Put out the first word with the specified alignment. */
2795 elt
= flip_storage_order (SImode
, gen_int_mode (data
[nelts
- 1], SImode
));
2797 elt
= GEN_INT (data
[0]);
2798 assemble_integer (elt
, MIN (nunits
, units_per
), align
, 1);
2799 nunits
-= units_per
;
2801 /* Subsequent words need only 32-bit alignment. */
2802 align
= min_align (align
, 32);
2804 for (int i
= 1; i
< nelts
; i
++)
2807 elt
= flip_storage_order (SImode
,
2808 gen_int_mode (data
[nelts
- 1 - i
], SImode
));
2810 elt
= GEN_INT (data
[i
]);
2811 assemble_integer (elt
, MIN (nunits
, units_per
), align
, 1);
2812 nunits
-= units_per
;
2816 /* Given an expression EXP with a constant value,
2817 reduce it to the sum of an assembler symbol and an integer.
2818 Store them both in the structure *VALUE.
2819 EXP must be reducible. */
2823 HOST_WIDE_INT offset
;
2827 decode_addr_const (tree exp
, struct addr_const
*value
)
2829 tree target
= TREE_OPERAND (exp
, 0);
2835 if (TREE_CODE (target
) == COMPONENT_REF
2836 && tree_fits_shwi_p (byte_position (TREE_OPERAND (target
, 1))))
2838 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2839 target
= TREE_OPERAND (target
, 0);
2841 else if (TREE_CODE (target
) == ARRAY_REF
2842 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2844 offset
+= (tree_to_uhwi (TYPE_SIZE_UNIT (TREE_TYPE (target
)))
2845 * tree_to_shwi (TREE_OPERAND (target
, 1)));
2846 target
= TREE_OPERAND (target
, 0);
2848 else if (TREE_CODE (target
) == MEM_REF
2849 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2851 offset
+= mem_ref_offset (target
).to_short_addr ();
2852 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2854 else if (TREE_CODE (target
) == INDIRECT_REF
2855 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2856 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2858 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2863 switch (TREE_CODE (target
))
2867 x
= DECL_RTL (target
);
2871 x
= gen_rtx_MEM (FUNCTION_MODE
,
2872 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2881 x
= output_constant_def (target
, 1);
2888 gcc_assert (MEM_P (x
));
2892 value
->offset
= offset
;
2895 static GTY(()) hash_table
<tree_descriptor_hasher
> *const_desc_htab
;
2897 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2899 /* Constant pool accessor function. */
2901 hash_table
<tree_descriptor_hasher
> *
2902 constant_pool_htab (void)
2904 return const_desc_htab
;
2907 /* Compute a hash code for a constant expression. */
2910 tree_descriptor_hasher::hash (constant_descriptor_tree
*ptr
)
2916 const_hash_1 (const tree exp
)
2921 enum tree_code code
= TREE_CODE (exp
);
2923 /* Either set P and LEN to the address and len of something to hash and
2924 exit the switch or return a value. */
2929 p
= (char *) &TREE_INT_CST_ELT (exp
, 0);
2930 len
= TREE_INT_CST_NUNITS (exp
) * sizeof (HOST_WIDE_INT
);
2934 return real_hash (TREE_REAL_CST_PTR (exp
));
2937 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2940 p
= TREE_STRING_POINTER (exp
);
2941 len
= TREE_STRING_LENGTH (exp
);
2945 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2946 + const_hash_1 (TREE_IMAGPART (exp
)));
2952 hi
= 7 + VECTOR_CST_NELTS (exp
);
2954 for (i
= 0; i
< VECTOR_CST_NELTS (exp
); ++i
)
2955 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ELT (exp
, i
));
2962 unsigned HOST_WIDE_INT idx
;
2965 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2967 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2969 hi
= hi
* 603 + const_hash_1 (value
);
2977 struct addr_const value
;
2979 decode_addr_const (exp
, &value
);
2980 switch (GET_CODE (value
.base
))
2983 /* Don't hash the address of the SYMBOL_REF;
2984 only use the offset and the symbol name. */
2986 p
= XSTR (value
.base
, 0);
2987 for (i
= 0; p
[i
] != 0; i
++)
2988 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2993 + CODE_LABEL_NUMBER (label_ref_label (value
.base
)) * 13);
3003 case POINTER_PLUS_EXPR
:
3005 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
3006 + const_hash_1 (TREE_OPERAND (exp
, 1)));
3009 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
3012 /* A language specific constant. Just hash the code. */
3016 /* Compute hashing function. */
3018 for (i
= 0; i
< len
; i
++)
3019 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3024 /* Wrapper of compare_constant, for the htab interface. */
3026 tree_descriptor_hasher::equal (constant_descriptor_tree
*c1
,
3027 constant_descriptor_tree
*c2
)
3029 if (c1
->hash
!= c2
->hash
)
3031 return compare_constant (c1
->value
, c2
->value
);
3034 /* Compare t1 and t2, and return 1 only if they are known to result in
3035 the same bit pattern on output. */
3038 compare_constant (const tree t1
, const tree t2
)
3040 enum tree_code typecode
;
3042 if (t1
== NULL_TREE
)
3043 return t2
== NULL_TREE
;
3044 if (t2
== NULL_TREE
)
3047 if (TREE_CODE (t1
) != TREE_CODE (t2
))
3050 switch (TREE_CODE (t1
))
3053 /* Integer constants are the same only if the same width of type. */
3054 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3056 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3058 return tree_int_cst_equal (t1
, t2
);
3061 /* Real constants are the same only if the same width of type. */
3062 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3065 return real_identical (&TREE_REAL_CST (t1
), &TREE_REAL_CST (t2
));
3068 /* Fixed constants are the same only if the same width of type. */
3069 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3072 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
3075 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3078 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
3079 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
3080 TREE_STRING_LENGTH (t1
)));
3083 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
3084 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
3090 if (VECTOR_CST_NELTS (t1
) != VECTOR_CST_NELTS (t2
))
3093 for (i
= 0; i
< VECTOR_CST_NELTS (t1
); ++i
)
3094 if (!compare_constant (VECTOR_CST_ELT (t1
, i
),
3095 VECTOR_CST_ELT (t2
, i
)))
3103 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
3104 unsigned HOST_WIDE_INT idx
;
3106 typecode
= TREE_CODE (TREE_TYPE (t1
));
3107 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
3110 if (typecode
== ARRAY_TYPE
)
3112 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
3113 /* For arrays, check that mode, size and storage order match. */
3114 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
3116 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
))
3117 || TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (t1
))
3118 != TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (t2
)))
3123 /* For record and union constructors, require exact type
3125 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
3129 v1
= CONSTRUCTOR_ELTS (t1
);
3130 v2
= CONSTRUCTOR_ELTS (t2
);
3131 if (vec_safe_length (v1
) != vec_safe_length (v2
))
3134 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
3136 constructor_elt
*c1
= &(*v1
)[idx
];
3137 constructor_elt
*c2
= &(*v2
)[idx
];
3139 /* Check that each value is the same... */
3140 if (!compare_constant (c1
->value
, c2
->value
))
3142 /* ... and that they apply to the same fields! */
3143 if (typecode
== ARRAY_TYPE
)
3145 if (!compare_constant (c1
->index
, c2
->index
))
3150 if (c1
->index
!= c2
->index
)
3161 struct addr_const value1
, value2
;
3165 decode_addr_const (t1
, &value1
);
3166 decode_addr_const (t2
, &value2
);
3168 if (value1
.offset
!= value2
.offset
)
3171 code
= GET_CODE (value1
.base
);
3172 if (code
!= GET_CODE (value2
.base
))
3178 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3182 ret
= (CODE_LABEL_NUMBER (label_ref_label (value1
.base
))
3183 == CODE_LABEL_NUMBER (label_ref_label (value2
.base
)));
3193 case POINTER_PLUS_EXPR
:
3196 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3197 && compare_constant (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3200 case VIEW_CONVERT_EXPR
:
3201 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3210 /* Return the section into which constant EXP should be placed. */
3213 get_constant_section (tree exp
, unsigned int align
)
3215 return targetm
.asm_out
.select_section (exp
,
3216 compute_reloc_for_constant (exp
),
3220 /* Return the size of constant EXP in bytes. */
3222 static HOST_WIDE_INT
3223 get_constant_size (tree exp
)
3227 size
= int_size_in_bytes (TREE_TYPE (exp
));
3228 if (TREE_CODE (exp
) == STRING_CST
)
3229 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3233 /* Subroutine of output_constant_def:
3234 No constant equal to EXP is known to have been output.
3235 Make a constant descriptor to enter EXP in the hash table.
3236 Assign the label number and construct RTL to refer to the
3237 constant's location in memory.
3238 Caller is responsible for updating the hash table. */
3240 static struct constant_descriptor_tree
*
3241 build_constant_desc (tree exp
)
3243 struct constant_descriptor_tree
*desc
;
3249 desc
= ggc_alloc
<constant_descriptor_tree
> ();
3252 /* Create a string containing the label name, in LABEL. */
3253 labelno
= const_labelno
++;
3254 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3256 /* Construct the VAR_DECL associated with the constant. */
3257 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3259 DECL_ARTIFICIAL (decl
) = 1;
3260 DECL_IGNORED_P (decl
) = 1;
3261 TREE_READONLY (decl
) = 1;
3262 TREE_STATIC (decl
) = 1;
3263 TREE_ADDRESSABLE (decl
) = 1;
3264 /* We don't set the RTL yet as this would cause varpool to assume that the
3265 variable is referenced. Moreover, it would just be dropped in LTO mode.
3266 Instead we set the flag that will be recognized in make_decl_rtl. */
3267 DECL_IN_CONSTANT_POOL (decl
) = 1;
3268 DECL_INITIAL (decl
) = desc
->value
;
3269 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3270 architectures so use DATA_ALIGNMENT as well, except for strings. */
3271 if (TREE_CODE (exp
) == STRING_CST
)
3273 SET_DECL_ALIGN (decl
, CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
)));
3276 align_variable (decl
, 0);
3278 /* Now construct the SYMBOL_REF and the MEM. */
3279 if (use_object_blocks_p ())
3281 int align
= (TREE_CODE (decl
) == CONST_DECL
3282 || (VAR_P (decl
) && DECL_IN_CONSTANT_POOL (decl
))
3284 : symtab_node::get (decl
)->definition_alignment ());
3285 section
*sect
= get_constant_section (exp
, align
);
3286 symbol
= create_block_symbol (ggc_strdup (label
),
3287 get_block_for_section (sect
), -1);
3290 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3291 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3292 SET_SYMBOL_REF_DECL (symbol
, decl
);
3293 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3295 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3296 set_mem_attributes (rtl
, exp
, 1);
3297 set_mem_alias_set (rtl
, 0);
3299 /* We cannot share RTX'es in pool entries.
3300 Mark this piece of RTL as required for unsharing. */
3301 RTX_FLAG (rtl
, used
) = 1;
3303 /* Set flags or add text to the name to record information, such as
3304 that it is a local symbol. If the name is changed, the macro
3305 ASM_OUTPUT_LABELREF will have to know how to strip this
3306 information. This call might invalidate our local variable
3307 SYMBOL; we can't use it afterward. */
3308 targetm
.encode_section_info (exp
, rtl
, true);
3315 /* Return an rtx representing a reference to constant data in memory
3316 for the constant expression EXP.
3318 If assembler code for such a constant has already been output,
3319 return an rtx to refer to it.
3320 Otherwise, output such a constant in memory
3321 and generate an rtx for it.
3323 If DEFER is nonzero, this constant can be deferred and output only
3324 if referenced in the function after all optimizations.
3326 `const_desc_table' records which constants already have label strings. */
3329 output_constant_def (tree exp
, int defer
)
3331 struct constant_descriptor_tree
*desc
;
3332 struct constant_descriptor_tree key
;
3334 /* Look up EXP in the table of constant descriptors. If we didn't find
3335 it, create a new one. */
3337 key
.hash
= const_hash_1 (exp
);
3338 constant_descriptor_tree
**loc
3339 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3344 desc
= build_constant_desc (exp
);
3345 desc
->hash
= key
.hash
;
3349 maybe_output_constant_def_contents (desc
, defer
);
3353 /* Subroutine of output_constant_def: Decide whether or not we need to
3354 output the constant DESC now, and if so, do it. */
3356 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3359 rtx symbol
= XEXP (desc
->rtl
, 0);
3360 tree exp
= desc
->value
;
3362 if (flag_syntax_only
)
3365 if (TREE_ASM_WRITTEN (exp
))
3366 /* Already output; don't do it again. */
3369 /* We can always defer constants as long as the context allows
3373 /* Increment n_deferred_constants if it exists. It needs to be at
3374 least as large as the number of constants actually referred to
3375 by the function. If it's too small we'll stop looking too early
3376 and fail to emit constants; if it's too large we'll only look
3377 through the entire function when we could have stopped earlier. */
3379 n_deferred_constants
++;
3383 output_constant_def_contents (symbol
);
3386 /* Subroutine of output_constant_def_contents. Output the definition
3387 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3388 constant's alignment in bits. */
3391 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3395 size
= get_constant_size (exp
);
3397 /* Do any machine/system dependent processing of the constant. */
3398 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3400 /* Output the value of EXP. */
3401 output_constant (exp
, size
, align
, false);
3403 targetm
.asm_out
.decl_end ();
3406 /* We must output the constant data referred to by SYMBOL; do so. */
3409 output_constant_def_contents (rtx symbol
)
3411 tree decl
= SYMBOL_REF_DECL (symbol
);
3412 tree exp
= DECL_INITIAL (decl
);
3413 bool asan_protected
= false;
3415 /* Make sure any other constants whose addresses appear in EXP
3416 are assigned label numbers. */
3417 output_addressed_constants (exp
);
3419 /* We are no longer deferring this constant. */
3420 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3422 if ((flag_sanitize
& SANITIZE_ADDRESS
)
3423 && TREE_CODE (exp
) == STRING_CST
3424 && asan_protect_global (exp
))
3426 asan_protected
= true;
3427 SET_DECL_ALIGN (decl
, MAX (DECL_ALIGN (decl
),
3428 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
));
3431 /* If the constant is part of an object block, make sure that the
3432 decl has been positioned within its block, but do not write out
3433 its definition yet. output_object_blocks will do that later. */
3434 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3435 place_block_symbol (symbol
);
3438 int align
= (TREE_CODE (decl
) == CONST_DECL
3439 || (VAR_P (decl
) && DECL_IN_CONSTANT_POOL (decl
))
3441 : symtab_node::get (decl
)->definition_alignment ());
3442 switch_to_section (get_constant_section (exp
, align
));
3443 if (align
> BITS_PER_UNIT
)
3444 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3445 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3448 HOST_WIDE_INT size
= get_constant_size (exp
);
3449 assemble_zeros (asan_red_zone_size (size
));
3454 /* Look up EXP in the table of constant descriptors. Return the rtl
3455 if it has been emitted, else null. */
3458 lookup_constant_def (tree exp
)
3460 struct constant_descriptor_tree key
;
3463 key
.hash
= const_hash_1 (exp
);
3464 constant_descriptor_tree
*desc
3465 = const_desc_htab
->find_with_hash (&key
, key
.hash
);
3467 return (desc
? desc
->rtl
: NULL_RTX
);
3470 /* Return a tree representing a reference to constant data in memory
3471 for the constant expression EXP.
3473 This is the counterpart of output_constant_def at the Tree level. */
3476 tree_output_constant_def (tree exp
)
3478 struct constant_descriptor_tree
*desc
, key
;
3481 /* Look up EXP in the table of constant descriptors. If we didn't find
3482 it, create a new one. */
3484 key
.hash
= const_hash_1 (exp
);
3485 constant_descriptor_tree
**loc
3486 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3491 desc
= build_constant_desc (exp
);
3492 desc
->hash
= key
.hash
;
3496 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3497 varpool_node::finalize_decl (decl
);
3501 struct GTY((chain_next ("%h.next"), for_user
)) constant_descriptor_rtx
{
3502 struct constant_descriptor_rtx
*next
;
3506 HOST_WIDE_INT offset
;
3514 struct const_rtx_desc_hasher
: ggc_ptr_hash
<constant_descriptor_rtx
>
3516 static hashval_t
hash (constant_descriptor_rtx
*);
3517 static bool equal (constant_descriptor_rtx
*, constant_descriptor_rtx
*);
3520 /* Used in the hash tables to avoid outputting the same constant
3521 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3522 are output once per function, not once per file. */
3523 /* ??? Only a few targets need per-function constant pools. Most
3524 can use one per-file pool. Should add a targetm bit to tell the
3527 struct GTY(()) rtx_constant_pool
{
3528 /* Pointers to first and last constant in pool, as ordered by offset. */
3529 struct constant_descriptor_rtx
*first
;
3530 struct constant_descriptor_rtx
*last
;
3532 /* Hash facility for making memory-constants from constant rtl-expressions.
3533 It is used on RISC machines where immediate integer arguments and
3534 constant addresses are restricted so that such constants must be stored
3536 hash_table
<const_rtx_desc_hasher
> *const_rtx_htab
;
3538 /* Current offset in constant pool (does not include any
3539 machine-specific header). */
3540 HOST_WIDE_INT offset
;
3543 /* Hash and compare functions for const_rtx_htab. */
3546 const_rtx_desc_hasher::hash (constant_descriptor_rtx
*desc
)
3552 const_rtx_desc_hasher::equal (constant_descriptor_rtx
*x
,
3553 constant_descriptor_rtx
*y
)
3555 if (x
->mode
!= y
->mode
)
3557 return rtx_equal_p (x
->constant
, y
->constant
);
3560 /* Hash one component of a constant. */
3563 const_rtx_hash_1 (const_rtx x
)
3565 unsigned HOST_WIDE_INT hwi
;
3571 code
= GET_CODE (x
);
3572 mode
= GET_MODE (x
);
3573 h
= (hashval_t
) code
* 1048573 + mode
;
3582 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3583 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3585 h
^= (hashval_t
) hwi
;
3586 for (i
= 1; i
< n
; ++i
)
3589 h
^= (hashval_t
) hwi
;
3594 case CONST_WIDE_INT
:
3595 hwi
= GET_MODE_PRECISION (mode
);
3597 for (i
= 0; i
< CONST_WIDE_INT_NUNITS (x
); i
++)
3598 hwi
^= CONST_WIDE_INT_ELT (x
, i
);
3603 if (TARGET_SUPPORTS_WIDE_INT
== 0 && mode
== VOIDmode
)
3605 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3609 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3613 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3617 h
^= htab_hash_string (XSTR (x
, 0));
3621 h
= h
* 251 + CODE_LABEL_NUMBER (label_ref_label (x
));
3625 case UNSPEC_VOLATILE
:
3626 h
= h
* 251 + XINT (x
, 1);
3636 /* Compute a hash value for X, which should be a constant. */
3639 const_rtx_hash (rtx x
)
3642 subrtx_iterator::array_type array
;
3643 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
3644 h
= h
* 509 + const_rtx_hash_1 (*iter
);
3649 /* Create and return a new rtx constant pool. */
3651 static struct rtx_constant_pool
*
3652 create_constant_pool (void)
3654 struct rtx_constant_pool
*pool
;
3656 pool
= ggc_alloc
<rtx_constant_pool
> ();
3657 pool
->const_rtx_htab
= hash_table
<const_rtx_desc_hasher
>::create_ggc (31);
3664 /* Initialize constant pool hashing for a new function. */
3667 init_varasm_status (void)
3669 crtl
->varasm
.pool
= create_constant_pool ();
3670 crtl
->varasm
.deferred_constants
= 0;
3673 /* Given a MINUS expression, simplify it if both sides
3674 include the same symbol. */
3677 simplify_subtraction (rtx x
)
3679 rtx r
= simplify_rtx (x
);
3683 /* Given a constant rtx X, make (or find) a memory constant for its value
3684 and return a MEM rtx to refer to it in memory. */
3687 force_const_mem (machine_mode mode
, rtx x
)
3689 struct constant_descriptor_rtx
*desc
, tmp
;
3690 struct rtx_constant_pool
*pool
;
3695 constant_descriptor_rtx
**slot
;
3697 /* If we're not allowed to drop X into the constant pool, don't. */
3698 if (targetm
.cannot_force_const_mem (mode
, x
))
3701 /* Record that this function has used a constant pool entry. */
3702 crtl
->uses_const_pool
= 1;
3704 /* Decide which pool to use. */
3705 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3706 ? shared_constant_pool
3707 : crtl
->varasm
.pool
);
3709 /* Lookup the value in the hashtable. */
3712 hash
= const_rtx_hash (x
);
3713 slot
= pool
->const_rtx_htab
->find_slot_with_hash (&tmp
, hash
, INSERT
);
3716 /* If the constant was already present, return its memory. */
3718 return copy_rtx (desc
->mem
);
3720 /* Otherwise, create a new descriptor. */
3721 desc
= ggc_alloc
<constant_descriptor_rtx
> ();
3724 /* Align the location counter as required by EXP's data type. */
3725 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3727 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3728 if (type
!= NULL_TREE
)
3729 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3731 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3732 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3735 desc
->constant
= copy_rtx (tmp
.constant
);
3736 desc
->offset
= pool
->offset
;
3739 desc
->align
= align
;
3740 desc
->labelno
= const_labelno
;
3743 pool
->offset
+= GET_MODE_SIZE (mode
);
3745 pool
->last
->next
= desc
;
3747 pool
->first
= pool
->last
= desc
;
3750 /* Create a string containing the label name, in LABEL. */
3751 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3754 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3755 the constants pool. */
3756 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3758 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3759 symbol
= create_block_symbol (ggc_strdup (label
),
3760 get_block_for_section (sect
), -1);
3763 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3765 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3766 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3767 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3769 /* Construct the MEM. */
3770 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3771 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3772 set_mem_align (def
, align
);
3774 /* If we're dropping a label to the constant pool, make sure we
3776 if (GET_CODE (x
) == LABEL_REF
)
3777 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3779 return copy_rtx (def
);
3782 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3785 get_pool_constant (const_rtx addr
)
3787 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3790 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3791 and whether it has been output or not. */
3794 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3796 struct constant_descriptor_rtx
*desc
;
3798 desc
= SYMBOL_REF_CONSTANT (addr
);
3799 *pmarked
= (desc
->mark
!= 0);
3800 return desc
->constant
;
3803 /* Similar, return the mode. */
3806 get_pool_mode (const_rtx addr
)
3808 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3811 /* Return the size of the constant pool. */
3814 get_pool_size_upper_bound (void)
3816 return crtl
->varasm
.pool
->offset
;
3819 /* Worker function for output_constant_pool_1. Emit assembly for X
3820 in MODE with known alignment ALIGN. */
3823 output_constant_pool_2 (machine_mode mode
, rtx x
, unsigned int align
)
3825 switch (GET_MODE_CLASS (mode
))
3828 case MODE_DECIMAL_FLOAT
:
3830 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3831 assemble_real (*CONST_DOUBLE_REAL_VALUE (x
), mode
, align
, false);
3836 case MODE_PARTIAL_INT
:
3841 case MODE_POINTER_BOUNDS
:
3842 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3845 case MODE_VECTOR_FLOAT
:
3846 case MODE_VECTOR_INT
:
3847 case MODE_VECTOR_FRACT
:
3848 case MODE_VECTOR_UFRACT
:
3849 case MODE_VECTOR_ACCUM
:
3850 case MODE_VECTOR_UACCUM
:
3853 machine_mode submode
= GET_MODE_INNER (mode
);
3854 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3856 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3857 units
= CONST_VECTOR_NUNITS (x
);
3859 for (i
= 0; i
< units
; i
++)
3861 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3862 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3872 /* Worker function for output_constant_pool. Emit constant DESC,
3873 giving it ALIGN bits of alignment. */
3876 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3883 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3884 whose CODE_LABEL has been deleted. This can occur if a jump table
3885 is eliminated by optimization. If so, write a constant of zero
3886 instead. Note that this can also happen by turning the
3887 CODE_LABEL into a NOTE. */
3888 /* ??? This seems completely and utterly wrong. Certainly it's
3889 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3890 functioning even with rtx_insn::deleted and friends. */
3893 switch (GET_CODE (tmp
))
3896 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3897 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3899 tmp
= XEXP (XEXP (tmp
, 0), 0);
3904 rtx_insn
*insn
= label_ref_label (tmp
);
3905 gcc_assert (!insn
->deleted ());
3906 gcc_assert (!NOTE_P (insn
)
3907 || NOTE_KIND (insn
) != NOTE_INSN_DELETED
);
3915 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3916 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3917 align
, desc
->labelno
, done
);
3920 assemble_align (align
);
3922 /* Output the label. */
3923 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3926 Pass actual alignment value while emitting string constant to asm code
3927 as function 'output_constant_pool_1' explicitly passes the alignment as 1
3928 assuming that the data is already aligned which prevents the generation
3929 of fix-up table entries. */
3930 output_constant_pool_2 (desc
->mode
, x
, desc
->align
);
3932 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3933 sections have proper size. */
3934 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3936 && (in_section
->common
.flags
& SECTION_MERGE
))
3937 assemble_align (align
);
3939 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3945 /* Recompute the offsets of entries in POOL, and the overall size of
3946 POOL. Do this after calling mark_constant_pool to ensure that we
3947 are computing the offset values for the pool which we will actually
3951 recompute_pool_offsets (struct rtx_constant_pool
*pool
)
3953 struct constant_descriptor_rtx
*desc
;
3956 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3959 /* Recalculate offset. */
3960 unsigned int align
= desc
->align
;
3961 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3962 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3963 desc
->offset
= pool
->offset
;
3964 pool
->offset
+= GET_MODE_SIZE (desc
->mode
);
3968 /* Mark all constants that are referenced by SYMBOL_REFs in X.
3969 Emit referenced deferred strings. */
3972 mark_constants_in_pattern (rtx insn
)
3974 subrtx_iterator::array_type array
;
3975 FOR_EACH_SUBRTX (iter
, array
, PATTERN (insn
), ALL
)
3977 const_rtx x
= *iter
;
3978 if (GET_CODE (x
) == SYMBOL_REF
)
3980 if (CONSTANT_POOL_ADDRESS_P (x
))
3982 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3983 if (desc
->mark
== 0)
3986 iter
.substitute (desc
->constant
);
3989 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3991 tree decl
= SYMBOL_REF_DECL (x
);
3992 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
3994 n_deferred_constants
--;
3995 output_constant_def_contents (CONST_CAST_RTX (x
));
4002 /* Look through appropriate parts of INSN, marking all entries in the
4003 constant pool which are actually being used. Entries that are only
4004 referenced by other constants are also marked as used. Emit
4005 deferred strings that are used. */
4008 mark_constants (rtx_insn
*insn
)
4013 /* Insns may appear inside a SEQUENCE. Only check the patterns of
4014 insns, not any notes that may be attached. We don't want to mark
4015 a constant just because it happens to appear in a REG_EQUIV note. */
4016 if (rtx_sequence
*seq
= dyn_cast
<rtx_sequence
*> (PATTERN (insn
)))
4018 int i
, n
= seq
->len ();
4019 for (i
= 0; i
< n
; ++i
)
4021 rtx subinsn
= seq
->element (i
);
4022 if (INSN_P (subinsn
))
4023 mark_constants_in_pattern (subinsn
);
4027 mark_constants_in_pattern (insn
);
4030 /* Look through the instructions for this function, and mark all the
4031 entries in POOL which are actually being used. Emit deferred constants
4032 which have indeed been used. */
4035 mark_constant_pool (void)
4039 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
4042 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
4043 mark_constants (insn
);
4046 /* Write all the constants in POOL. */
4049 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
4051 struct constant_descriptor_rtx
*desc
;
4053 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
4056 /* If the constant is part of an object_block, make sure that
4057 the constant has been positioned within its block, but do not
4058 write out its definition yet. output_object_blocks will do
4060 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
4061 && SYMBOL_REF_BLOCK (desc
->sym
))
4062 place_block_symbol (desc
->sym
);
4065 switch_to_section (targetm
.asm_out
.select_rtx_section
4066 (desc
->mode
, desc
->constant
, desc
->align
));
4067 output_constant_pool_1 (desc
, desc
->align
);
4072 /* Mark all constants that are used in the current function, then write
4073 out the function's private constant pool. */
4076 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
4077 tree fndecl ATTRIBUTE_UNUSED
)
4079 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
4081 /* It is possible for gcc to call force_const_mem and then to later
4082 discard the instructions which refer to the constant. In such a
4083 case we do not need to output the constant. */
4084 mark_constant_pool ();
4086 /* Having marked the constant pool entries we'll actually emit, we
4087 now need to rebuild the offset information, which may have become
4089 recompute_pool_offsets (pool
);
4091 #ifdef ASM_OUTPUT_POOL_PROLOGUE
4092 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4095 output_constant_pool_contents (pool
);
4097 #ifdef ASM_OUTPUT_POOL_EPILOGUE
4098 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4102 /* Write the contents of the shared constant pool. */
4105 output_shared_constant_pool (void)
4107 output_constant_pool_contents (shared_constant_pool
);
4110 /* Determine what kind of relocations EXP may need. */
4113 compute_reloc_for_constant (tree exp
)
4115 int reloc
= 0, reloc2
;
4118 switch (TREE_CODE (exp
))
4122 /* Go inside any operations that get_inner_reference can handle and see
4123 if what's inside is a constant: no need to do anything here for
4124 addresses of variables or functions. */
4125 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4126 tem
= TREE_OPERAND (tem
, 0))
4129 if (TREE_CODE (tem
) == MEM_REF
4130 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
4132 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
4136 if (!targetm
.binds_local_p (tem
))
4143 case POINTER_PLUS_EXPR
:
4144 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4145 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4149 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4150 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4151 /* The difference of two local labels is computable at link time. */
4152 if (reloc
== 1 && reloc2
== 1)
4159 case VIEW_CONVERT_EXPR
:
4160 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4165 unsigned HOST_WIDE_INT idx
;
4166 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4168 reloc
|= compute_reloc_for_constant (tem
);
4178 /* Find all the constants whose addresses are referenced inside of EXP,
4179 and make sure assembler code with a label has been output for each one.
4180 Indicate whether an ADDR_EXPR has been encountered. */
4183 output_addressed_constants (tree exp
)
4187 switch (TREE_CODE (exp
))
4191 /* Go inside any operations that get_inner_reference can handle and see
4192 if what's inside is a constant: no need to do anything here for
4193 addresses of variables or functions. */
4194 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4195 tem
= TREE_OPERAND (tem
, 0))
4198 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4199 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4200 tem
= DECL_INITIAL (tem
);
4202 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4203 output_constant_def (tem
, 0);
4205 if (TREE_CODE (tem
) == MEM_REF
)
4206 output_addressed_constants (TREE_OPERAND (tem
, 0));
4210 case POINTER_PLUS_EXPR
:
4212 output_addressed_constants (TREE_OPERAND (exp
, 1));
4216 case VIEW_CONVERT_EXPR
:
4217 output_addressed_constants (TREE_OPERAND (exp
, 0));
4222 unsigned HOST_WIDE_INT idx
;
4223 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4225 output_addressed_constants (tem
);
4234 /* Whether a constructor CTOR is a valid static constant initializer if all
4235 its elements are. This used to be internal to initializer_constant_valid_p
4236 and has been exposed to let other functions like categorize_ctor_elements
4237 evaluate the property while walking a constructor for other purposes. */
4240 constructor_static_from_elts_p (const_tree ctor
)
4242 return (TREE_CONSTANT (ctor
)
4243 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4244 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4245 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4248 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4251 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4252 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4253 which are valid when ENDTYPE is an integer of any size; in
4254 particular, this does not accept a pointer minus a constant. This
4255 returns null_pointer_node if the VALUE is an absolute constant
4256 which can be used to initialize a static variable. Otherwise it
4260 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4264 if (!INTEGRAL_TYPE_P (endtype
))
4267 op0
= TREE_OPERAND (value
, 0);
4268 op1
= TREE_OPERAND (value
, 1);
4270 /* Like STRIP_NOPS except allow the operand mode to widen. This
4271 works around a feature of fold that simplifies (int)(p1 - p2) to
4272 ((int)p1 - (int)p2) under the theory that the narrower operation
4275 while (CONVERT_EXPR_P (op0
)
4276 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4278 tree inner
= TREE_OPERAND (op0
, 0);
4279 if (inner
== error_mark_node
4280 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4281 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4282 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4287 while (CONVERT_EXPR_P (op1
)
4288 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4290 tree inner
= TREE_OPERAND (op1
, 0);
4291 if (inner
== error_mark_node
4292 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4293 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4294 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4299 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4303 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4304 cache
? cache
+ 2 : NULL
);
4305 /* Both initializers must be known. */
4309 && (op0
== null_pointer_node
4310 || TREE_CODE (value
) == MINUS_EXPR
))
4311 return null_pointer_node
;
4313 /* Support differences between labels. */
4314 if (TREE_CODE (op0
) == LABEL_DECL
4315 && TREE_CODE (op1
) == LABEL_DECL
)
4316 return null_pointer_node
;
4318 if (TREE_CODE (op0
) == STRING_CST
4319 && TREE_CODE (op1
) == STRING_CST
4320 && operand_equal_p (op0
, op1
, 1))
4321 return null_pointer_node
;
4327 /* Helper function of initializer_constant_valid_p.
4328 Return nonzero if VALUE is a valid constant-valued expression
4329 for use in initializing a static variable; one that can be an
4330 element of a "constant" initializer.
4332 Return null_pointer_node if the value is absolute;
4333 if it is relocatable, return the variable that determines the relocation.
4334 We assume that VALUE has been folded as much as possible;
4335 therefore, we do not need to check for such things as
4336 arithmetic-combinations of integers.
4338 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4341 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4345 switch (TREE_CODE (value
))
4348 if (constructor_static_from_elts_p (value
))
4350 unsigned HOST_WIDE_INT idx
;
4352 bool absolute
= true;
4354 if (cache
&& cache
[0] == value
)
4356 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4359 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4362 /* An absolute value is required with reverse SSO. */
4363 || (reloc
!= null_pointer_node
4364 && TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (value
))
4365 && !AGGREGATE_TYPE_P (TREE_TYPE (elt
))))
4370 cache
[1] = NULL_TREE
;
4374 if (reloc
!= null_pointer_node
)
4377 /* For a non-absolute relocation, there is no single
4378 variable that can be "the variable that determines the
4383 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4385 return absolute
? null_pointer_node
: error_mark_node
;
4388 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4396 return null_pointer_node
;
4401 tree op0
= staticp (TREE_OPERAND (value
, 0));
4404 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4405 to be a constant, this is old-skool offsetof-like nonsense. */
4406 if (TREE_CODE (op0
) == INDIRECT_REF
4407 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4408 return null_pointer_node
;
4409 /* Taking the address of a nested function involves a trampoline,
4410 unless we don't need or want one. */
4411 if (TREE_CODE (op0
) == FUNCTION_DECL
4412 && DECL_STATIC_CHAIN (op0
)
4413 && !TREE_NO_TRAMPOLINE (value
))
4415 /* "&{...}" requires a temporary to hold the constructed
4417 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4423 case NON_LVALUE_EXPR
:
4424 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4427 case VIEW_CONVERT_EXPR
:
4429 tree src
= TREE_OPERAND (value
, 0);
4430 tree src_type
= TREE_TYPE (src
);
4431 tree dest_type
= TREE_TYPE (value
);
4433 /* Allow view-conversions from aggregate to non-aggregate type only
4434 if the bit pattern is fully preserved afterwards; otherwise, the
4435 RTL expander won't be able to apply a subsequent transformation
4436 to the underlying constructor. */
4437 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4439 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4440 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4445 /* Allow all other kinds of view-conversion. */
4446 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4451 tree src
= TREE_OPERAND (value
, 0);
4452 tree src_type
= TREE_TYPE (src
);
4453 tree dest_type
= TREE_TYPE (value
);
4455 /* Allow conversions between pointer types, floating-point
4456 types, and offset types. */
4457 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4458 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4459 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4460 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4461 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4463 /* Allow length-preserving conversions between integer types. */
4464 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4465 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4466 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4468 /* Allow conversions between other integer types only if
4470 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4472 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4473 if (inner
== null_pointer_node
)
4474 return null_pointer_node
;
4478 /* Allow (int) &foo provided int is as wide as a pointer. */
4479 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4480 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4481 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4483 /* Likewise conversions from int to pointers, but also allow
4484 conversions from 0. */
4485 if ((POINTER_TYPE_P (dest_type
)
4486 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4487 && INTEGRAL_TYPE_P (src_type
))
4489 if (TREE_CODE (src
) == INTEGER_CST
4490 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4491 return null_pointer_node
;
4492 if (integer_zerop (src
))
4493 return null_pointer_node
;
4494 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4495 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4498 /* Allow conversions to struct or union types if the value
4500 if (TREE_CODE (dest_type
) == RECORD_TYPE
4501 || TREE_CODE (dest_type
) == UNION_TYPE
)
4502 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4506 case POINTER_PLUS_EXPR
:
4508 /* Any valid floating-point constants will have been folded by now;
4509 with -frounding-math we hit this with addition of two constants. */
4510 if (TREE_CODE (endtype
) == REAL_TYPE
)
4512 if (cache
&& cache
[0] == value
)
4514 if (! INTEGRAL_TYPE_P (endtype
)
4515 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4517 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4519 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4522 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4523 endtype
, ncache
+ 2);
4524 /* If either term is absolute, use the other term's relocation. */
4525 if (valid0
== null_pointer_node
)
4527 else if (valid1
== null_pointer_node
)
4529 /* Support narrowing pointer differences. */
4531 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4535 /* Support narrowing pointer differences. */
4536 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4545 if (TREE_CODE (endtype
) == REAL_TYPE
)
4547 if (cache
&& cache
[0] == value
)
4549 if (! INTEGRAL_TYPE_P (endtype
)
4550 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4552 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4554 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4557 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4558 endtype
, ncache
+ 2);
4559 /* Win if second argument is absolute. */
4560 if (valid1
== null_pointer_node
)
4562 /* Win if both arguments have the same relocation.
4563 Then the value is absolute. */
4564 else if (valid0
== valid1
&& valid0
!= 0)
4565 ret
= null_pointer_node
;
4566 /* Since GCC guarantees that string constants are unique in the
4567 generated code, a subtraction between two copies of the same
4568 constant string is absolute. */
4569 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4570 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4571 && operand_equal_p (valid0
, valid1
, 1))
4572 ret
= null_pointer_node
;
4573 /* Support narrowing differences. */
4575 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4579 /* Support narrowing differences. */
4580 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4595 /* Return nonzero if VALUE is a valid constant-valued expression
4596 for use in initializing a static variable; one that can be an
4597 element of a "constant" initializer.
4599 Return null_pointer_node if the value is absolute;
4600 if it is relocatable, return the variable that determines the relocation.
4601 We assume that VALUE has been folded as much as possible;
4602 therefore, we do not need to check for such things as
4603 arithmetic-combinations of integers. */
4605 initializer_constant_valid_p (tree value
, tree endtype
, bool reverse
)
4607 tree reloc
= initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4609 /* An absolute value is required with reverse storage order. */
4611 && reloc
!= null_pointer_node
4613 && !AGGREGATE_TYPE_P (endtype
)
4614 && !VECTOR_TYPE_P (endtype
))
4620 /* Return true if VALUE is a valid constant-valued expression
4621 for use in initializing a static bit-field; one that can be
4622 an element of a "constant" initializer. */
4625 initializer_constant_valid_for_bitfield_p (tree value
)
4627 /* For bitfields we support integer constants or possibly nested aggregates
4629 switch (TREE_CODE (value
))
4633 unsigned HOST_WIDE_INT idx
;
4636 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4637 if (!initializer_constant_valid_for_bitfield_p (elt
))
4646 case VIEW_CONVERT_EXPR
:
4647 case NON_LVALUE_EXPR
:
4649 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4658 /* output_constructor outer state of relevance in recursive calls, typically
4659 for nested aggregate bitfields. */
4661 struct oc_outer_state
{
4662 unsigned int bit_offset
; /* current position in ... */
4663 int byte
; /* ... the outer byte buffer. */
4666 static unsigned HOST_WIDE_INT
4667 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int, bool,
4670 /* Output assembler code for constant EXP, with no label.
4671 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4672 Assumes output_addressed_constants has been done on EXP already.
4674 Generate at least SIZE bytes of assembler data, padding at the end
4675 with zeros if necessary. SIZE must always be specified. The returned
4676 value is the actual number of bytes of assembler data generated, which
4677 may be bigger than SIZE if the object contains a variable length field.
4679 SIZE is important for structure constructors,
4680 since trailing members may have been omitted from the constructor.
4681 It is also important for initialization of arrays from string constants
4682 since the full length of the string constant might not be wanted.
4683 It is also needed for initialization of unions, where the initializer's
4684 type is just one member, and that may not be as long as the union.
4686 There a case in which we would fail to output exactly SIZE bytes:
4687 for a structure constructor that wants to produce more than SIZE bytes.
4688 But such constructors will never be generated for any possible input.
4690 ALIGN is the alignment of the data in bits.
4692 If REVERSE is true, EXP is output in reverse storage order. */
4694 static unsigned HOST_WIDE_INT
4695 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
,
4698 enum tree_code code
;
4699 unsigned HOST_WIDE_INT thissize
;
4702 if (size
== 0 || flag_syntax_only
)
4705 /* See if we're trying to initialize a pointer in a non-default mode
4706 to the address of some declaration somewhere. If the target says
4707 the mode is valid for pointers, assume the target has a way of
4709 if (TREE_CODE (exp
) == NOP_EXPR
4710 && POINTER_TYPE_P (TREE_TYPE (exp
))
4711 && targetm
.addr_space
.valid_pointer_mode
4712 (TYPE_MODE (TREE_TYPE (exp
)),
4713 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4715 tree saved_type
= TREE_TYPE (exp
);
4717 /* Peel off any intermediate conversions-to-pointer for valid
4719 while (TREE_CODE (exp
) == NOP_EXPR
4720 && POINTER_TYPE_P (TREE_TYPE (exp
))
4721 && targetm
.addr_space
.valid_pointer_mode
4722 (TYPE_MODE (TREE_TYPE (exp
)),
4723 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4724 exp
= TREE_OPERAND (exp
, 0);
4726 /* If what we're left with is the address of something, we can
4727 convert the address to the final type and output it that
4729 if (TREE_CODE (exp
) == ADDR_EXPR
)
4730 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4731 /* Likewise for constant ints. */
4732 else if (TREE_CODE (exp
) == INTEGER_CST
)
4733 exp
= fold_convert (saved_type
, exp
);
4737 /* Eliminate any conversions since we'll be outputting the underlying
4739 while (CONVERT_EXPR_P (exp
)
4740 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4741 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4743 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4744 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4746 /* Make sure eliminating the conversion is really a no-op, except with
4747 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4748 union types to allow for Ada unchecked unions. */
4749 if (type_size
> op_size
4750 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4751 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4752 /* Keep the conversion. */
4755 exp
= TREE_OPERAND (exp
, 0);
4758 code
= TREE_CODE (TREE_TYPE (exp
));
4759 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4761 /* Allow a constructor with no elements for any data type.
4762 This means to fill the space with zeros. */
4763 if (TREE_CODE (exp
) == CONSTRUCTOR
4764 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4766 assemble_zeros (size
);
4770 if (TREE_CODE (exp
) == FDESC_EXPR
)
4772 #ifdef ASM_OUTPUT_FDESC
4773 HOST_WIDE_INT part
= tree_to_shwi (TREE_OPERAND (exp
, 1));
4774 tree decl
= TREE_OPERAND (exp
, 0);
4775 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4782 /* Now output the underlying data. If we've handling the padding, return.
4783 Otherwise, break and ensure SIZE is the size written. */
4790 case REFERENCE_TYPE
:
4792 case FIXED_POINT_TYPE
:
4793 case POINTER_BOUNDS_TYPE
:
4795 cst
= expand_expr (exp
, NULL_RTX
, VOIDmode
, EXPAND_INITIALIZER
);
4797 cst
= flip_storage_order (TYPE_MODE (TREE_TYPE (exp
)), cst
);
4798 if (!assemble_integer (cst
, MIN (size
, thissize
), align
, 0))
4799 error ("initializer for integer/fixed-point value is too complicated");
4803 if (TREE_CODE (exp
) != REAL_CST
)
4804 error ("initializer for floating value is not a floating constant");
4806 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)),
4811 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
, reverse
);
4812 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4813 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)),
4819 switch (TREE_CODE (exp
))
4822 return output_constructor (exp
, size
, align
, reverse
, NULL
);
4825 = MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
), size
);
4826 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4830 machine_mode inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4831 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4832 int elt_size
= GET_MODE_SIZE (inner
);
4833 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
,
4835 thissize
= elt_size
;
4836 for (unsigned int i
= 1; i
< VECTOR_CST_NELTS (exp
); i
++)
4838 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
,
4840 thissize
+= elt_size
;
4851 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4852 return output_constructor (exp
, size
, align
, reverse
, NULL
);
4861 if (size
> thissize
)
4862 assemble_zeros (size
- thissize
);
4867 /* Subroutine of output_constructor, used for computing the size of
4868 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4869 type with an unspecified upper bound. */
4871 static unsigned HOST_WIDE_INT
4872 array_size_for_constructor (tree val
)
4875 unsigned HOST_WIDE_INT cnt
;
4876 tree index
, value
, tmp
;
4879 /* This code used to attempt to handle string constants that are not
4880 arrays of single-bytes, but nothing else does, so there's no point in
4882 if (TREE_CODE (val
) == STRING_CST
)
4883 return TREE_STRING_LENGTH (val
);
4885 max_index
= NULL_TREE
;
4886 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4888 if (TREE_CODE (index
) == RANGE_EXPR
)
4889 index
= TREE_OPERAND (index
, 1);
4890 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4894 if (max_index
== NULL_TREE
)
4897 /* Compute the total number of array elements. */
4898 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4899 i
= wi::to_offset (max_index
) - wi::to_offset (tmp
) + 1;
4901 /* Multiply by the array element unit size to find number of bytes. */
4902 i
*= wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4904 gcc_assert (wi::fits_uhwi_p (i
));
4905 return i
.to_uhwi ();
4908 /* Other datastructures + helpers for output_constructor. */
4910 /* output_constructor local state to support interaction with helpers. */
4912 struct oc_local_state
{
4914 /* Received arguments. */
4915 tree exp
; /* Constructor expression. */
4916 tree type
; /* Type of constructor expression. */
4917 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4918 unsigned int align
; /* Known initial alignment. */
4919 tree min_index
; /* Lower bound if specified for an array. */
4921 /* Output processing state. */
4922 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4923 int byte
; /* Part of a bitfield byte yet to be output. */
4924 int last_relative_index
; /* Implicit or explicit index of the last
4925 array element output within a bitfield. */
4926 bool byte_buffer_in_use
; /* Whether BYTE is in use. */
4927 bool reverse
; /* Whether reverse storage order is in use. */
4929 /* Current element. */
4930 tree field
; /* Current field decl in a record. */
4931 tree val
; /* Current element value. */
4932 tree index
; /* Current element index. */
4936 /* Helper for output_constructor. From the current LOCAL state, output a
4937 RANGE_EXPR element. */
4940 output_constructor_array_range (oc_local_state
*local
)
4942 unsigned HOST_WIDE_INT fieldsize
4943 = int_size_in_bytes (TREE_TYPE (local
->type
));
4945 HOST_WIDE_INT lo_index
4946 = tree_to_shwi (TREE_OPERAND (local
->index
, 0));
4947 HOST_WIDE_INT hi_index
4948 = tree_to_shwi (TREE_OPERAND (local
->index
, 1));
4949 HOST_WIDE_INT index
;
4952 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4954 for (index
= lo_index
; index
<= hi_index
; index
++)
4956 /* Output the element's initial value. */
4957 if (local
->val
== NULL_TREE
)
4958 assemble_zeros (fieldsize
);
4961 = output_constant (local
->val
, fieldsize
, align2
, local
->reverse
);
4963 /* Count its size. */
4964 local
->total_bytes
+= fieldsize
;
4968 /* Helper for output_constructor. From the current LOCAL state, output a
4969 field element that is not true bitfield or part of an outer one. */
4972 output_constructor_regular_field (oc_local_state
*local
)
4974 /* Field size and position. Since this structure is static, we know the
4975 positions are constant. */
4976 unsigned HOST_WIDE_INT fieldsize
;
4977 HOST_WIDE_INT fieldpos
;
4979 unsigned int align2
;
4981 /* Output any buffered-up bit-fields preceding this element. */
4982 if (local
->byte_buffer_in_use
)
4984 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4985 local
->total_bytes
++;
4986 local
->byte_buffer_in_use
= false;
4989 if (local
->index
!= NULL_TREE
)
4991 /* Perform the index calculation in modulo arithmetic but
4992 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4993 but we are using an unsigned sizetype. */
4994 unsigned prec
= TYPE_PRECISION (sizetype
);
4995 offset_int idx
= wi::sext (wi::to_offset (local
->index
)
4996 - wi::to_offset (local
->min_index
), prec
);
4997 fieldpos
= (idx
* wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
))))
5000 else if (local
->field
!= NULL_TREE
)
5001 fieldpos
= int_byte_position (local
->field
);
5005 /* Advance to offset of this element.
5006 Note no alignment needed in an array, since that is guaranteed
5007 if each element has the proper size. */
5008 if (local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
5010 if (fieldpos
> local
->total_bytes
)
5012 assemble_zeros (fieldpos
- local
->total_bytes
);
5013 local
->total_bytes
= fieldpos
;
5016 /* Must not go backwards. */
5017 gcc_assert (fieldpos
== local
->total_bytes
);
5020 /* Find the alignment of this element. */
5021 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
5023 /* Determine size this element should occupy. */
5028 /* If this is an array with an unspecified upper bound,
5029 the initializer determines the size. */
5030 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
5031 but we cannot do this until the deprecated support for
5032 initializing zero-length array members is removed. */
5033 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
5034 && (!TYPE_DOMAIN (TREE_TYPE (local
->field
))
5035 || !TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
)))))
5037 fieldsize
= array_size_for_constructor (local
->val
);
5038 /* Given a non-empty initialization, this field had better
5039 be last. Given a flexible array member, the next field
5040 on the chain is a TYPE_DECL of the enclosing struct. */
5041 const_tree next
= DECL_CHAIN (local
->field
);
5042 gcc_assert (!fieldsize
|| !next
|| TREE_CODE (next
) != FIELD_DECL
);
5045 fieldsize
= tree_to_uhwi (DECL_SIZE_UNIT (local
->field
));
5048 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
5050 /* Output the element's initial value. */
5051 if (local
->val
== NULL_TREE
)
5052 assemble_zeros (fieldsize
);
5055 = output_constant (local
->val
, fieldsize
, align2
, local
->reverse
);
5057 /* Count its size. */
5058 local
->total_bytes
+= fieldsize
;
5061 /* Helper for output_constructor. From the LOCAL state, output an element
5062 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
5063 from the start of a possibly ongoing outer byte buffer. */
5066 output_constructor_bitfield (oc_local_state
*local
, unsigned int bit_offset
)
5068 /* Bit size of this element. */
5069 HOST_WIDE_INT ebitsize
5071 ? tree_to_uhwi (DECL_SIZE (local
->field
))
5072 : tree_to_uhwi (TYPE_SIZE (TREE_TYPE (local
->type
))));
5074 /* Relative index of this element if this is an array component. */
5075 HOST_WIDE_INT relative_index
5078 ? (tree_to_shwi (local
->index
)
5079 - tree_to_shwi (local
->min_index
))
5080 : local
->last_relative_index
+ 1)
5083 /* Bit position of this element from the start of the containing
5085 HOST_WIDE_INT constructor_relative_ebitpos
5087 ? int_bit_position (local
->field
)
5088 : ebitsize
* relative_index
);
5090 /* Bit position of this element from the start of a possibly ongoing
5091 outer byte buffer. */
5092 HOST_WIDE_INT byte_relative_ebitpos
5093 = bit_offset
+ constructor_relative_ebitpos
;
5095 /* From the start of a possibly ongoing outer byte buffer, offsets to
5096 the first bit of this element and to the first bit past the end of
5098 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
5099 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
5101 local
->last_relative_index
= relative_index
;
5103 if (local
->val
== NULL_TREE
)
5104 local
->val
= integer_zero_node
;
5106 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
5107 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
5108 local
->val
= TREE_OPERAND (local
->val
, 0);
5110 if (TREE_CODE (local
->val
) != INTEGER_CST
5111 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
5113 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
5117 /* If this field does not start in this (or next) byte, skip some bytes. */
5118 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5120 /* Output remnant of any bit field in previous bytes. */
5121 if (local
->byte_buffer_in_use
)
5123 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5124 local
->total_bytes
++;
5125 local
->byte_buffer_in_use
= false;
5128 /* If still not at proper byte, advance to there. */
5129 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5131 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
5132 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
5133 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
5137 /* Set up the buffer if necessary. */
5138 if (!local
->byte_buffer_in_use
)
5142 local
->byte_buffer_in_use
= true;
5145 /* If this is nested constructor, recurse passing the bit offset and the
5146 pending data, then retrieve the new pending data afterwards. */
5147 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
5149 oc_outer_state temp_state
;
5150 temp_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
5151 temp_state
.byte
= local
->byte
;
5153 += output_constructor (local
->val
, 0, 0, local
->reverse
, &temp_state
);
5154 local
->byte
= temp_state
.byte
;
5158 /* Otherwise, we must split the element into pieces that fall within
5159 separate bytes, and combine each byte with previous or following
5161 while (next_offset
< end_offset
)
5165 HOST_WIDE_INT value
;
5166 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
5167 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
5169 /* Advance from byte to byte within this element when necessary. */
5170 while (next_byte
!= local
->total_bytes
)
5172 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5173 local
->total_bytes
++;
5177 /* Number of bits we can process at once (all part of the same byte). */
5178 this_time
= MIN (end_offset
- next_offset
, BITS_PER_UNIT
- next_bit
);
5179 if (local
->reverse
? !BYTES_BIG_ENDIAN
: BYTES_BIG_ENDIAN
)
5181 /* For big-endian data, take the most significant bits (of the
5182 bits that are significant) first and put them into bytes from
5183 the most significant end. */
5184 shift
= end_offset
- next_offset
- this_time
;
5186 /* Don't try to take a bunch of bits that cross
5187 the word boundary in the INTEGER_CST. We can
5188 only select bits from one element. */
5189 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5190 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5192 const int end
= shift
+ this_time
- 1;
5193 shift
= end
& -HOST_BITS_PER_WIDE_INT
;
5194 this_time
= end
- shift
+ 1;
5197 /* Now get the bits from the appropriate constant word. */
5198 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5199 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5201 /* Get the result. This works only when:
5202 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5203 local
->byte
|= (((value
>> shift
)
5204 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5205 << (BITS_PER_UNIT
- this_time
- next_bit
));
5209 /* On little-endian machines, take the least significant bits of
5210 the value first and pack them starting at the least significant
5211 bits of the bytes. */
5212 shift
= next_offset
- byte_relative_ebitpos
;
5214 /* Don't try to take a bunch of bits that cross
5215 the word boundary in the INTEGER_CST. We can
5216 only select bits from one element. */
5217 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5218 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5220 = HOST_BITS_PER_WIDE_INT
- (shift
& (HOST_BITS_PER_WIDE_INT
- 1));
5222 /* Now get the bits from the appropriate constant word. */
5223 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5224 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5226 /* Get the result. This works only when:
5227 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5228 local
->byte
|= (((value
>> shift
)
5229 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5233 next_offset
+= this_time
;
5234 local
->byte_buffer_in_use
= true;
5238 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5239 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5240 caller output state of relevance in recursive invocations. */
5242 static unsigned HOST_WIDE_INT
5243 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
,
5244 bool reverse
, oc_outer_state
*outer
)
5246 unsigned HOST_WIDE_INT cnt
;
5247 constructor_elt
*ce
;
5248 oc_local_state local
;
5250 /* Setup our local state to communicate with helpers. */
5252 local
.type
= TREE_TYPE (exp
);
5254 local
.align
= align
;
5255 if (TREE_CODE (local
.type
) == ARRAY_TYPE
&& TYPE_DOMAIN (local
.type
))
5256 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5258 local
.min_index
= integer_zero_node
;
5260 local
.total_bytes
= 0;
5261 local
.byte_buffer_in_use
= outer
!= NULL
;
5262 local
.byte
= outer
? outer
->byte
: 0;
5263 local
.last_relative_index
= -1;
5264 /* The storage order is specified for every aggregate type. */
5265 if (AGGREGATE_TYPE_P (local
.type
))
5266 local
.reverse
= TYPE_REVERSE_STORAGE_ORDER (local
.type
);
5268 local
.reverse
= reverse
;
5270 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5272 /* As CE goes through the elements of the constant, FIELD goes through the
5273 structure fields if the constant is a structure. If the constant is a
5274 union, we override this by getting the field from the TREE_LIST element.
5275 But the constant could also be an array. Then FIELD is zero.
5277 There is always a maximum of one element in the chain LINK for unions
5278 (even if the initializer in a source program incorrectly contains
5281 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5282 local
.field
= TYPE_FIELDS (local
.type
);
5284 local
.field
= NULL_TREE
;
5287 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5288 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5290 local
.val
= ce
->value
;
5291 local
.index
= NULL_TREE
;
5293 /* The element in a union constructor specifies the proper field
5295 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5296 local
.field
= ce
->index
;
5298 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5299 local
.index
= ce
->index
;
5301 if (local
.field
&& flag_verbose_asm
)
5302 fprintf (asm_out_file
, "%s %s:\n",
5304 DECL_NAME (local
.field
)
5305 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5308 /* Eliminate the marker that makes a cast not be an lvalue. */
5309 if (local
.val
!= NULL_TREE
)
5310 STRIP_NOPS (local
.val
);
5312 /* Output the current element, using the appropriate helper ... */
5314 /* For an array slice not part of an outer bitfield. */
5316 && local
.index
!= NULL_TREE
5317 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5318 output_constructor_array_range (&local
);
5320 /* For a field that is neither a true bitfield nor part of an outer one,
5321 known to be at least byte aligned and multiple-of-bytes long. */
5323 && (local
.field
== NULL_TREE
5324 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5325 output_constructor_regular_field (&local
);
5327 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5328 supported for scalar fields, so we may need to convert first. */
5331 if (TREE_CODE (local
.val
) == REAL_CST
)
5333 = fold_unary (VIEW_CONVERT_EXPR
,
5334 build_nonstandard_integer_type
5335 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5337 output_constructor_bitfield (&local
, outer
? outer
->bit_offset
: 0);
5341 /* If we are not at toplevel, save the pending data for our caller.
5342 Otherwise output the pending data and padding zeros as needed. */
5344 outer
->byte
= local
.byte
;
5347 if (local
.byte_buffer_in_use
)
5349 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5350 local
.total_bytes
++;
5353 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5355 assemble_zeros (local
.size
- local
.total_bytes
);
5356 local
.total_bytes
= local
.size
;
5360 return local
.total_bytes
;
5363 /* Mark DECL as weak. */
5366 mark_weak (tree decl
)
5368 if (DECL_WEAK (decl
))
5371 struct symtab_node
*n
= symtab_node::get (decl
);
5372 if (n
&& n
->refuse_visibility_changes
)
5373 error ("%+D declared weak after being used", decl
);
5374 DECL_WEAK (decl
) = 1;
5376 if (DECL_RTL_SET_P (decl
)
5377 && MEM_P (DECL_RTL (decl
))
5378 && XEXP (DECL_RTL (decl
), 0)
5379 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5380 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5383 /* Merge weak status between NEWDECL and OLDDECL. */
5386 merge_weak (tree newdecl
, tree olddecl
)
5388 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5390 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5393 /* We put the NEWDECL on the weak_decls list at some point
5394 and OLDDECL as well. Keep just OLDDECL on the list. */
5395 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5396 if (TREE_VALUE (*pwd
) == newdecl
)
5398 *pwd
= TREE_CHAIN (*pwd
);
5405 if (DECL_WEAK (newdecl
))
5409 /* NEWDECL is weak, but OLDDECL is not. */
5411 /* If we already output the OLDDECL, we're in trouble; we can't
5412 go back and make it weak. This should never happen in
5413 unit-at-a-time compilation. */
5414 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5416 /* If we've already generated rtl referencing OLDDECL, we may
5417 have done so in a way that will not function properly with
5418 a weak symbol. Again in unit-at-a-time this should be
5420 gcc_assert (!TREE_USED (olddecl
)
5421 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5423 /* PR 49899: You cannot convert a static function into a weak, public function. */
5424 if (! TREE_PUBLIC (olddecl
) && TREE_PUBLIC (newdecl
))
5425 error ("weak declaration of %q+D being applied to a already "
5426 "existing, static definition", newdecl
);
5428 if (TARGET_SUPPORTS_WEAK
)
5430 /* We put the NEWDECL on the weak_decls list at some point.
5431 Replace it with the OLDDECL. */
5432 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5433 if (TREE_VALUE (wd
) == newdecl
)
5435 TREE_VALUE (wd
) = olddecl
;
5438 /* We may not find the entry on the list. If NEWDECL is a
5439 weak alias, then we will have already called
5440 globalize_decl to remove the entry; in that case, we do
5441 not need to do anything. */
5444 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5445 mark_weak (olddecl
);
5448 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5449 weak. Just update NEWDECL to indicate that it's weak too. */
5450 mark_weak (newdecl
);
5453 /* Declare DECL to be a weak symbol. */
5456 declare_weak (tree decl
)
5458 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5459 if (! TREE_PUBLIC (decl
))
5461 error ("weak declaration of %q+D must be public", decl
);
5464 else if (!TARGET_SUPPORTS_WEAK
)
5465 warning (0, "weak declaration of %q+D not supported", decl
);
5468 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5469 DECL_ATTRIBUTES (decl
)
5470 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5474 weak_finish_1 (tree decl
)
5476 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5477 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5480 if (! TREE_USED (decl
))
5483 #ifdef ASM_WEAKEN_DECL
5484 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5486 #ifdef ASM_WEAKEN_LABEL
5487 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5489 #ifdef ASM_OUTPUT_WEAK_ALIAS
5491 static bool warn_once
= 0;
5494 warning (0, "only weak aliases are supported in this configuration");
5504 /* Fiven an assembly name, find the decl it is associated with. */
5506 find_decl (tree target
)
5508 symtab_node
*node
= symtab_node::get_for_asmname (target
);
5514 /* This TREE_LIST contains weakref targets. */
5516 static GTY(()) tree weakref_targets
;
5518 /* Emit any pending weak declarations. */
5525 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5527 tree alias_decl
= TREE_PURPOSE (t
);
5528 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5530 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5531 /* Remove alias_decl from the weak list, but leave entries for
5532 the target alone. */
5534 #ifndef ASM_OUTPUT_WEAKREF
5535 else if (! TREE_SYMBOL_REFERENCED (target
))
5537 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5538 defined, otherwise we and weak_finish_1 would use
5539 different macros. */
5540 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5541 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5543 tree decl
= find_decl (target
);
5547 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5548 TREE_CODE (alias_decl
), target
,
5549 TREE_TYPE (alias_decl
));
5551 DECL_EXTERNAL (decl
) = 1;
5552 TREE_PUBLIC (decl
) = 1;
5553 DECL_ARTIFICIAL (decl
) = 1;
5554 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5555 TREE_USED (decl
) = 1;
5558 weak_finish_1 (decl
);
5567 /* Remove the alias and the target from the pending weak list
5568 so that we do not emit any .weak directives for the former,
5569 nor multiple .weak directives for the latter. */
5570 for (p
= &weak_decls
; (t2
= *p
) ; )
5572 if (TREE_VALUE (t2
) == alias_decl
5573 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5574 *p
= TREE_CHAIN (t2
);
5576 p
= &TREE_CHAIN (t2
);
5579 /* Remove other weakrefs to the same target, to speed things up. */
5580 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5582 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5583 *p
= TREE_CHAIN (t2
);
5585 p
= &TREE_CHAIN (t2
);
5590 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5592 tree decl
= TREE_VALUE (t
);
5594 weak_finish_1 (decl
);
5598 /* Emit the assembly bits to indicate that DECL is globally visible. */
5601 globalize_decl (tree decl
)
5604 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5605 if (DECL_WEAK (decl
))
5607 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5610 #ifdef ASM_WEAKEN_DECL
5611 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5613 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5616 /* Remove this function from the pending weak list so that
5617 we do not emit multiple .weak directives for it. */
5618 for (p
= &weak_decls
; (t
= *p
) ; )
5620 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5621 *p
= TREE_CHAIN (t
);
5623 p
= &TREE_CHAIN (t
);
5626 /* Remove weakrefs to the same target from the pending weakref
5627 list, for the same reason. */
5628 for (p
= &weakref_targets
; (t
= *p
) ; )
5630 if (DECL_ASSEMBLER_NAME (decl
)
5631 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5632 *p
= TREE_CHAIN (t
);
5634 p
= &TREE_CHAIN (t
);
5641 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5644 vec
<alias_pair
, va_gc
> *alias_pairs
;
5646 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5647 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5648 tree node is DECL to have the value of the tree node TARGET. */
5651 do_assemble_alias (tree decl
, tree target
)
5655 /* Emulated TLS had better not get this var. */
5656 gcc_assert (!(!targetm
.have_tls
5658 && DECL_THREAD_LOCAL_P (decl
)));
5660 if (TREE_ASM_WRITTEN (decl
))
5663 id
= DECL_ASSEMBLER_NAME (decl
);
5664 ultimate_transparent_alias_target (&id
);
5665 ultimate_transparent_alias_target (&target
);
5667 /* We must force creation of DECL_RTL for debug info generation, even though
5668 we don't use it here. */
5669 make_decl_rtl (decl
);
5671 TREE_ASM_WRITTEN (decl
) = 1;
5672 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5673 TREE_ASM_WRITTEN (id
) = 1;
5675 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5677 if (!TREE_SYMBOL_REFERENCED (target
))
5678 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5680 #ifdef ASM_OUTPUT_WEAKREF
5681 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5682 IDENTIFIER_POINTER (id
),
5683 IDENTIFIER_POINTER (target
));
5685 if (!TARGET_SUPPORTS_WEAK
)
5687 error_at (DECL_SOURCE_LOCATION (decl
),
5688 "weakref is not supported in this configuration");
5695 #ifdef ASM_OUTPUT_DEF
5696 tree orig_decl
= decl
;
5698 if (TREE_CODE (decl
) == FUNCTION_DECL
5699 && cgraph_node::get (decl
)->instrumentation_clone
5700 && cgraph_node::get (decl
)->instrumented_version
)
5701 orig_decl
= cgraph_node::get (decl
)->instrumented_version
->decl
;
5703 /* Make name accessible from other files, if appropriate. */
5705 if (TREE_PUBLIC (decl
) || TREE_PUBLIC (orig_decl
))
5707 globalize_decl (decl
);
5708 maybe_assemble_visibility (decl
);
5710 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5712 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5713 if (targetm
.has_ifunc_p ())
5714 ASM_OUTPUT_TYPE_DIRECTIVE
5715 (asm_out_file
, IDENTIFIER_POINTER (id
),
5719 error_at (DECL_SOURCE_LOCATION (decl
),
5720 "ifunc is not supported on this target");
5723 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5724 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5726 ASM_OUTPUT_DEF (asm_out_file
,
5727 IDENTIFIER_POINTER (id
),
5728 IDENTIFIER_POINTER (target
));
5730 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5735 name
= IDENTIFIER_POINTER (id
);
5736 # ifdef ASM_WEAKEN_DECL
5737 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5739 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5741 /* Remove this function from the pending weak list so that
5742 we do not emit multiple .weak directives for it. */
5743 for (p
= &weak_decls
; (t
= *p
) ; )
5744 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
))
5745 || id
== DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5746 *p
= TREE_CHAIN (t
);
5748 p
= &TREE_CHAIN (t
);
5750 /* Remove weakrefs to the same target from the pending weakref
5751 list, for the same reason. */
5752 for (p
= &weakref_targets
; (t
= *p
) ; )
5754 if (id
== ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5755 *p
= TREE_CHAIN (t
);
5757 p
= &TREE_CHAIN (t
);
5763 /* Emit an assembler directive to make the symbol for DECL an alias to
5764 the symbol for TARGET. */
5767 assemble_alias (tree decl
, tree target
)
5771 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5773 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5775 ultimate_transparent_alias_target (&target
);
5777 if (alias
== target
)
5778 error ("weakref %q+D ultimately targets itself", decl
);
5779 if (TREE_PUBLIC (decl
))
5780 error ("weakref %q+D must have static linkage", decl
);
5784 #if !defined (ASM_OUTPUT_DEF)
5785 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5786 error_at (DECL_SOURCE_LOCATION (decl
),
5787 "alias definitions not supported in this configuration");
5788 TREE_ASM_WRITTEN (decl
) = 1;
5791 if (!DECL_WEAK (decl
))
5793 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5794 error_at (DECL_SOURCE_LOCATION (decl
),
5795 "ifunc is not supported in this configuration");
5797 error_at (DECL_SOURCE_LOCATION (decl
),
5798 "only weak aliases are supported in this configuration");
5799 TREE_ASM_WRITTEN (decl
) = 1;
5805 TREE_USED (decl
) = 1;
5807 /* Allow aliases to aliases. */
5808 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5809 cgraph_node::get_create (decl
)->alias
= true;
5811 varpool_node::get_create (decl
)->alias
= true;
5813 /* If the target has already been emitted, we don't have to queue the
5814 alias. This saves a tad of memory. */
5815 if (symtab
->global_info_ready
)
5816 target_decl
= find_decl (target
);
5819 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5820 || symtab
->state
>= EXPANSION
)
5821 do_assemble_alias (decl
, target
);
5824 alias_pair p
= {decl
, target
};
5825 vec_safe_push (alias_pairs
, p
);
5829 /* Record and output a table of translations from original function
5830 to its transaction aware clone. Note that tm_pure functions are
5831 considered to be their own clone. */
5833 struct tm_clone_hasher
: ggc_cache_ptr_hash
<tree_map
>
5835 static hashval_t
hash (tree_map
*m
) { return tree_map_hash (m
); }
5836 static bool equal (tree_map
*a
, tree_map
*b
) { return tree_map_eq (a
, b
); }
5839 keep_cache_entry (tree_map
*&e
)
5841 return ggc_marked_p (e
->base
.from
);
5845 static GTY((cache
)) hash_table
<tm_clone_hasher
> *tm_clone_hash
;
5848 record_tm_clone_pair (tree o
, tree n
)
5850 struct tree_map
**slot
, *h
;
5852 if (tm_clone_hash
== NULL
)
5853 tm_clone_hash
= hash_table
<tm_clone_hasher
>::create_ggc (32);
5855 h
= ggc_alloc
<tree_map
> ();
5856 h
->hash
= htab_hash_pointer (o
);
5860 slot
= tm_clone_hash
->find_slot_with_hash (h
, h
->hash
, INSERT
);
5865 get_tm_clone_pair (tree o
)
5869 struct tree_map
*h
, in
;
5872 in
.hash
= htab_hash_pointer (o
);
5873 h
= tm_clone_hash
->find_with_hash (&in
, in
.hash
);
5880 struct tm_alias_pair
5888 /* Dump the actual pairs to the .tm_clone_table section. */
5891 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5895 bool switched
= false;
5897 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5901 struct cgraph_node
*src_n
= cgraph_node::get (src
);
5902 struct cgraph_node
*dst_n
= cgraph_node::get (dst
);
5904 /* The function ipa_tm_create_version() marks the clone as needed if
5905 the original function was needed. But we also mark the clone as
5906 needed if we ever called the clone indirectly through
5907 TM_GETTMCLONE. If neither of these are true, we didn't generate
5908 a clone, and we didn't call it indirectly... no sense keeping it
5909 in the clone table. */
5910 if (!dst_n
|| !dst_n
->definition
)
5913 /* This covers the case where we have optimized the original
5914 function away, and only access the transactional clone. */
5915 if (!src_n
|| !src_n
->definition
)
5920 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5921 assemble_align (POINTER_SIZE
);
5925 assemble_integer (XEXP (DECL_RTL (src
), 0),
5926 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
5927 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5928 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
5932 /* Provide a default for the tm_clone_table section. */
5935 default_clone_table_section (void)
5937 return get_named_section (NULL
, ".tm_clone_table", 3);
5940 /* Helper comparison function for qsorting by the DECL_UID stored in
5941 alias_pair->emitted_diags. */
5944 tm_alias_pair_cmp (const void *x
, const void *y
)
5946 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5947 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5948 if (p1
->uid
< p2
->uid
)
5950 if (p1
->uid
> p2
->uid
)
5956 finish_tm_clone_pairs (void)
5958 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5960 if (tm_clone_hash
== NULL
)
5963 /* We need a determenistic order for the .tm_clone_table, otherwise
5964 we will get bootstrap comparison failures, so dump the hash table
5965 to a vector, sort it, and dump the vector. */
5967 /* Dump the hashtable to a vector. */
5969 hash_table
<tm_clone_hasher
>::iterator iter
;
5970 FOR_EACH_HASH_TABLE_ELEMENT (*tm_clone_hash
, map
, tree_map
*, iter
)
5972 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5973 tm_alias_pairs
.safe_push (p
);
5976 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5979 dump_tm_clone_pairs (tm_alias_pairs
);
5981 tm_clone_hash
->empty ();
5982 tm_clone_hash
= NULL
;
5983 tm_alias_pairs
.release ();
5987 /* Emit an assembler directive to set symbol for DECL visibility to
5988 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5991 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5992 int vis ATTRIBUTE_UNUSED
)
5994 #ifdef HAVE_GAS_HIDDEN
5995 static const char * const visibility_types
[] = {
5996 NULL
, "protected", "hidden", "internal"
5999 const char *name
, *type
;
6002 id
= DECL_ASSEMBLER_NAME (decl
);
6003 ultimate_transparent_alias_target (&id
);
6004 name
= IDENTIFIER_POINTER (id
);
6006 type
= visibility_types
[vis
];
6008 fprintf (asm_out_file
, "\t.%s\t", type
);
6009 assemble_name (asm_out_file
, name
);
6010 fprintf (asm_out_file
, "\n");
6012 if (!DECL_ARTIFICIAL (decl
))
6013 warning (OPT_Wattributes
, "visibility attribute not supported "
6014 "in this configuration; ignored");
6018 /* A helper function to call assemble_visibility when needed for a decl. */
6021 maybe_assemble_visibility (tree decl
)
6023 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
6025 if (TREE_CODE (decl
) == FUNCTION_DECL
6026 && cgraph_node::get (decl
)
6027 && cgraph_node::get (decl
)->instrumentation_clone
6028 && cgraph_node::get (decl
)->instrumented_version
)
6029 vis
= DECL_VISIBILITY (cgraph_node::get (decl
)->instrumented_version
->decl
);
6031 if (vis
!= VISIBILITY_DEFAULT
)
6033 targetm
.asm_out
.assemble_visibility (decl
, vis
);
6040 /* Returns 1 if the target configuration supports defining public symbols
6041 so that one of them will be chosen at link time instead of generating a
6042 multiply-defined symbol error, whether through the use of weak symbols or
6043 a target-specific mechanism for having duplicates discarded. */
6046 supports_one_only (void)
6048 if (SUPPORTS_ONE_ONLY
)
6050 return TARGET_SUPPORTS_WEAK
;
6053 /* Set up DECL as a public symbol that can be defined in multiple
6054 translation units without generating a linker error. */
6057 make_decl_one_only (tree decl
, tree comdat_group
)
6059 struct symtab_node
*symbol
;
6060 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
6062 TREE_PUBLIC (decl
) = 1;
6065 symbol
= varpool_node::get_create (decl
);
6067 symbol
= cgraph_node::get_create (decl
);
6069 if (SUPPORTS_ONE_ONLY
)
6071 #ifdef MAKE_DECL_ONE_ONLY
6072 MAKE_DECL_ONE_ONLY (decl
);
6074 symbol
->set_comdat_group (comdat_group
);
6076 else if (VAR_P (decl
)
6077 && (DECL_INITIAL (decl
) == 0
6078 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6079 DECL_COMMON (decl
) = 1;
6082 gcc_assert (TARGET_SUPPORTS_WEAK
);
6083 DECL_WEAK (decl
) = 1;
6088 init_varasm_once (void)
6090 section_htab
= hash_table
<section_hasher
>::create_ggc (31);
6091 object_block_htab
= hash_table
<object_block_hasher
>::create_ggc (31);
6092 const_desc_htab
= hash_table
<tree_descriptor_hasher
>::create_ggc (1009);
6094 shared_constant_pool
= create_constant_pool ();
6096 #ifdef TEXT_SECTION_ASM_OP
6097 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
6098 TEXT_SECTION_ASM_OP
);
6101 #ifdef DATA_SECTION_ASM_OP
6102 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6103 DATA_SECTION_ASM_OP
);
6106 #ifdef SDATA_SECTION_ASM_OP
6107 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6108 SDATA_SECTION_ASM_OP
);
6111 #ifdef READONLY_DATA_SECTION_ASM_OP
6112 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
6113 READONLY_DATA_SECTION_ASM_OP
);
6116 #ifdef CTORS_SECTION_ASM_OP
6117 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
6118 CTORS_SECTION_ASM_OP
);
6121 #ifdef DTORS_SECTION_ASM_OP
6122 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
6123 DTORS_SECTION_ASM_OP
);
6126 #ifdef BSS_SECTION_ASM_OP
6127 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6128 output_section_asm_op
,
6129 BSS_SECTION_ASM_OP
);
6132 #ifdef SBSS_SECTION_ASM_OP
6133 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6134 output_section_asm_op
,
6135 SBSS_SECTION_ASM_OP
);
6138 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6139 | SECTION_COMMON
, emit_tls_common
);
6140 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6141 | SECTION_COMMON
, emit_local
);
6142 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6143 | SECTION_COMMON
, emit_common
);
6145 #if defined ASM_OUTPUT_ALIGNED_BSS
6146 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
6150 targetm
.asm_out
.init_sections ();
6152 if (readonly_data_section
== NULL
)
6153 readonly_data_section
= text_section
;
6155 #ifdef ASM_OUTPUT_EXTERNAL
6156 pending_assemble_externals_set
= new hash_set
<tree
>;
6161 decl_default_tls_model (const_tree decl
)
6163 enum tls_model kind
;
6166 is_local
= targetm
.binds_local_p (decl
);
6170 kind
= TLS_MODEL_LOCAL_EXEC
;
6172 kind
= TLS_MODEL_INITIAL_EXEC
;
6175 /* Local dynamic is inefficient when we're not combining the
6176 parts of the address. */
6177 else if (optimize
&& is_local
)
6178 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
6180 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
6181 if (kind
< flag_tls_default
)
6182 kind
= flag_tls_default
;
6187 /* Select a set of attributes for section NAME based on the properties
6188 of DECL and whether or not RELOC indicates that DECL's initializer
6189 might contain runtime relocations.
6191 We make the section read-only and executable for a function decl,
6192 read-only for a const data decl, and writable for a non-const data decl. */
6195 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6199 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6200 flags
= SECTION_CODE
;
6203 enum section_category category
6204 = categorize_decl_for_section (decl
, reloc
);
6205 if (decl_readonly_section_1 (category
))
6207 else if (category
== SECCAT_DATA_REL_RO
6208 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6209 flags
= SECTION_WRITE
| SECTION_RELRO
;
6211 flags
= SECTION_WRITE
;
6215 flags
= SECTION_WRITE
;
6216 if (strcmp (name
, ".data.rel.ro") == 0
6217 || strcmp (name
, ".data.rel.ro.local") == 0)
6218 flags
|= SECTION_RELRO
;
6221 if (decl
&& DECL_P (decl
) && DECL_COMDAT_GROUP (decl
))
6222 flags
|= SECTION_LINKONCE
;
6224 if (strcmp (name
, ".vtable_map_vars") == 0)
6225 flags
|= SECTION_LINKONCE
;
6227 if (decl
&& VAR_P (decl
) && DECL_THREAD_LOCAL_P (decl
))
6228 flags
|= SECTION_TLS
| SECTION_WRITE
;
6230 if (strcmp (name
, ".bss") == 0
6231 || strncmp (name
, ".bss.", 5) == 0
6232 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6233 || strcmp (name
, ".persistent.bss") == 0
6234 || strcmp (name
, ".sbss") == 0
6235 || strncmp (name
, ".sbss.", 6) == 0
6236 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6237 flags
|= SECTION_BSS
;
6239 if (strcmp (name
, ".tdata") == 0
6240 || strncmp (name
, ".tdata.", 7) == 0
6241 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6242 flags
|= SECTION_TLS
;
6244 if (strcmp (name
, ".tbss") == 0
6245 || strncmp (name
, ".tbss.", 6) == 0
6246 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6247 flags
|= SECTION_TLS
| SECTION_BSS
;
6249 /* These three sections have special ELF types. They are neither
6250 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6251 want to print a section type (@progbits or @nobits). If someone
6252 is silly enough to emit code or TLS variables to one of these
6253 sections, then don't handle them specially. */
6254 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6255 && (strcmp (name
, ".init_array") == 0
6256 || strcmp (name
, ".fini_array") == 0
6257 || strcmp (name
, ".preinit_array") == 0))
6258 flags
|= SECTION_NOTYPE
;
6263 /* Return true if the target supports some form of global BSS,
6264 either through bss_noswitch_section, or by selecting a BSS
6265 section in TARGET_ASM_SELECT_SECTION. */
6268 have_global_bss_p (void)
6270 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6273 /* Output assembly to switch to section NAME with attribute FLAGS.
6274 Four variants for common object file formats. */
6277 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6278 unsigned int flags ATTRIBUTE_UNUSED
,
6279 tree decl ATTRIBUTE_UNUSED
)
6281 /* Some object formats don't support named sections at all. The
6282 front-end should already have flagged this as an error. */
6286 #ifndef TLS_SECTION_ASM_FLAG
6287 #define TLS_SECTION_ASM_FLAG 'T'
6291 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6294 char flagchars
[11], *f
= flagchars
;
6295 unsigned int numeric_value
= 0;
6297 /* If we have already declared this section, we can use an
6298 abbreviated form to switch back to it -- unless this section is
6299 part of a COMDAT groups, in which case GAS requires the full
6300 declaration every time. */
6301 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6302 && (flags
& SECTION_DECLARED
))
6304 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6308 /* If we have a machine specific flag, then use the numeric value to pass
6310 if (targetm
.asm_out
.elf_flags_numeric (flags
, &numeric_value
))
6311 snprintf (f
, sizeof (flagchars
), "0x%08x", numeric_value
);
6314 if (!(flags
& SECTION_DEBUG
))
6316 #if defined (HAVE_GAS_SECTION_EXCLUDE) && HAVE_GAS_SECTION_EXCLUDE == 1
6317 if (flags
& SECTION_EXCLUDE
)
6320 if (flags
& SECTION_WRITE
)
6322 if (flags
& SECTION_CODE
)
6324 if (flags
& SECTION_SMALL
)
6326 if (flags
& SECTION_MERGE
)
6328 if (flags
& SECTION_STRINGS
)
6330 if (flags
& SECTION_TLS
)
6331 *f
++ = TLS_SECTION_ASM_FLAG
;
6332 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6334 #ifdef MACH_DEP_SECTION_ASM_FLAG
6335 if (flags
& SECTION_MACH_DEP
)
6336 *f
++ = MACH_DEP_SECTION_ASM_FLAG
;
6341 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6343 if (!(flags
& SECTION_NOTYPE
))
6348 if (flags
& SECTION_BSS
)
6354 /* On platforms that use "@" as the assembly comment character,
6356 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6358 fprintf (asm_out_file
, format
, type
);
6360 if (flags
& SECTION_ENTSIZE
)
6361 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6362 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6364 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6365 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6367 fprintf (asm_out_file
, ",%s,comdat",
6368 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6372 putc ('\n', asm_out_file
);
6376 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6377 tree decl ATTRIBUTE_UNUSED
)
6379 char flagchars
[8], *f
= flagchars
;
6381 if (flags
& SECTION_WRITE
)
6383 if (flags
& SECTION_CODE
)
6387 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6391 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6394 default_coff_asm_named_section (name
, flags
, decl
);
6396 if (flags
& SECTION_LINKONCE
)
6398 /* Functions may have been compiled at various levels of
6399 optimization so we can't use `same_size' here.
6400 Instead, have the linker pick one. */
6401 fprintf (asm_out_file
, "\t.linkonce %s\n",
6402 (flags
& SECTION_CODE
? "discard" : "same_size"));
6406 /* The lame default section selector. */
6409 default_select_section (tree decl
, int reloc
,
6410 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6414 if (decl_readonly_section (decl
, reloc
))
6415 return readonly_data_section
;
6417 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6419 if (! ((flag_pic
&& reloc
)
6420 || !TREE_READONLY (decl
)
6421 || TREE_SIDE_EFFECTS (decl
)
6422 || !TREE_CONSTANT (decl
)))
6423 return readonly_data_section
;
6425 else if (TREE_CODE (decl
) == STRING_CST
)
6426 return readonly_data_section
;
6427 else if (! (flag_pic
&& reloc
))
6428 return readonly_data_section
;
6430 return data_section
;
6433 enum section_category
6434 categorize_decl_for_section (const_tree decl
, int reloc
)
6436 enum section_category ret
;
6438 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6440 else if (TREE_CODE (decl
) == STRING_CST
)
6442 if ((flag_sanitize
& SANITIZE_ADDRESS
)
6443 && asan_protect_global (CONST_CAST_TREE (decl
)))
6444 /* or !flag_merge_constants */
6445 return SECCAT_RODATA
;
6447 return SECCAT_RODATA_MERGE_STR
;
6449 else if (VAR_P (decl
))
6451 if (bss_initializer_p (decl
))
6453 else if (! TREE_READONLY (decl
)
6454 || TREE_SIDE_EFFECTS (decl
)
6455 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6457 /* Here the reloc_rw_mask is not testing whether the section should
6458 be read-only or not, but whether the dynamic link will have to
6459 do something. If so, we wish to segregate the data in order to
6460 minimize cache misses inside the dynamic linker. */
6461 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6462 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6466 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6467 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6468 else if (reloc
|| flag_merge_constants
< 2
6469 || ((flag_sanitize
& SANITIZE_ADDRESS
)
6470 && asan_protect_global (CONST_CAST_TREE (decl
))))
6471 /* C and C++ don't allow different variables to share the same
6472 location. -fmerge-all-constants allows even that (at the
6473 expense of not conforming). */
6474 ret
= SECCAT_RODATA
;
6475 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6476 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6478 ret
= SECCAT_RODATA_MERGE_CONST
;
6480 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6482 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6483 || TREE_SIDE_EFFECTS (decl
)
6484 || ! TREE_CONSTANT (decl
))
6487 ret
= SECCAT_RODATA
;
6490 ret
= SECCAT_RODATA
;
6492 /* There are no read-only thread-local sections. */
6493 if (VAR_P (decl
) && DECL_THREAD_LOCAL_P (decl
))
6495 /* Note that this would be *just* SECCAT_BSS, except that there's
6496 no concept of a read-only thread-local-data section. */
6497 if (ret
== SECCAT_BSS
6498 || (flag_zero_initialized_in_bss
6499 && initializer_zerop (DECL_INITIAL (decl
))))
6505 /* If the target uses small data sections, select it. */
6506 else if (targetm
.in_small_data_p (decl
))
6508 if (ret
== SECCAT_BSS
)
6510 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6511 ret
= SECCAT_SRODATA
;
6520 decl_readonly_section_1 (enum section_category category
)
6525 case SECCAT_RODATA_MERGE_STR
:
6526 case SECCAT_RODATA_MERGE_STR_INIT
:
6527 case SECCAT_RODATA_MERGE_CONST
:
6528 case SECCAT_SRODATA
:
6536 decl_readonly_section (const_tree decl
, int reloc
)
6538 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6541 /* Select a section based on the above categorization. */
6544 default_elf_select_section (tree decl
, int reloc
,
6545 unsigned HOST_WIDE_INT align
)
6548 switch (categorize_decl_for_section (decl
, reloc
))
6551 /* We're not supposed to be called on FUNCTION_DECLs. */
6554 return readonly_data_section
;
6555 case SECCAT_RODATA_MERGE_STR
:
6556 return mergeable_string_section (decl
, align
, 0);
6557 case SECCAT_RODATA_MERGE_STR_INIT
:
6558 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6559 case SECCAT_RODATA_MERGE_CONST
:
6560 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6561 case SECCAT_SRODATA
:
6565 return data_section
;
6566 case SECCAT_DATA_REL
:
6567 sname
= ".data.rel";
6569 case SECCAT_DATA_REL_LOCAL
:
6570 sname
= ".data.rel.local";
6572 case SECCAT_DATA_REL_RO
:
6573 sname
= ".data.rel.ro";
6575 case SECCAT_DATA_REL_RO_LOCAL
:
6576 sname
= ".data.rel.ro.local";
6599 return get_named_section (decl
, sname
, reloc
);
6602 /* Construct a unique section name based on the decl name and the
6603 categorization performed above. */
6606 default_unique_section (tree decl
, int reloc
)
6608 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6609 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6610 const char *prefix
, *name
, *linkonce
;
6614 switch (categorize_decl_for_section (decl
, reloc
))
6617 prefix
= one_only
? ".t" : ".text";
6620 case SECCAT_RODATA_MERGE_STR
:
6621 case SECCAT_RODATA_MERGE_STR_INIT
:
6622 case SECCAT_RODATA_MERGE_CONST
:
6623 prefix
= one_only
? ".r" : ".rodata";
6625 case SECCAT_SRODATA
:
6626 prefix
= one_only
? ".s2" : ".sdata2";
6629 prefix
= one_only
? ".d" : ".data";
6631 case SECCAT_DATA_REL
:
6632 prefix
= one_only
? ".d.rel" : ".data.rel";
6634 case SECCAT_DATA_REL_LOCAL
:
6635 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6637 case SECCAT_DATA_REL_RO
:
6638 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6640 case SECCAT_DATA_REL_RO_LOCAL
:
6641 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6644 prefix
= one_only
? ".s" : ".sdata";
6647 prefix
= one_only
? ".b" : ".bss";
6650 prefix
= one_only
? ".sb" : ".sbss";
6653 prefix
= one_only
? ".td" : ".tdata";
6656 prefix
= one_only
? ".tb" : ".tbss";
6662 id
= DECL_ASSEMBLER_NAME (decl
);
6663 ultimate_transparent_alias_target (&id
);
6664 name
= IDENTIFIER_POINTER (id
);
6665 name
= targetm
.strip_name_encoding (name
);
6667 /* If we're using one_only, then there needs to be a .gnu.linkonce
6668 prefix to the section name. */
6669 linkonce
= one_only
? ".gnu.linkonce" : "";
6671 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6673 set_decl_section_name (decl
, string
);
6676 /* Subroutine of compute_reloc_for_rtx for leaf rtxes. */
6679 compute_reloc_for_rtx_1 (const_rtx x
)
6681 switch (GET_CODE (x
))
6684 return SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6692 /* Like compute_reloc_for_constant, except for an RTX. The return value
6693 is a mask for which bit 1 indicates a global relocation, and bit 0
6694 indicates a local relocation. */
6697 compute_reloc_for_rtx (const_rtx x
)
6699 switch (GET_CODE (x
))
6703 return compute_reloc_for_rtx_1 (x
);
6708 subrtx_iterator::array_type array
;
6709 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
6710 reloc
|= compute_reloc_for_rtx_1 (*iter
);
6720 default_select_rtx_section (machine_mode mode ATTRIBUTE_UNUSED
,
6722 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6724 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6725 return data_section
;
6727 return readonly_data_section
;
6731 default_elf_select_rtx_section (machine_mode mode
, rtx x
,
6732 unsigned HOST_WIDE_INT align
)
6734 int reloc
= compute_reloc_for_rtx (x
);
6736 /* ??? Handle small data here somehow. */
6738 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6741 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6743 return get_named_section (NULL
, ".data.rel.ro", 3);
6746 return mergeable_constant_section (mode
, align
, 0);
6749 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6752 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6757 /* Careful not to prod global register variables. */
6760 symbol
= XEXP (rtl
, 0);
6761 if (GET_CODE (symbol
) != SYMBOL_REF
)
6764 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6765 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6766 flags
|= SYMBOL_FLAG_FUNCTION
;
6767 if (targetm
.binds_local_p (decl
))
6768 flags
|= SYMBOL_FLAG_LOCAL
;
6769 if (VAR_P (decl
) && DECL_THREAD_LOCAL_P (decl
))
6770 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6771 else if (targetm
.in_small_data_p (decl
))
6772 flags
|= SYMBOL_FLAG_SMALL
;
6773 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6774 being PUBLIC, the thing *must* be defined in this translation unit.
6775 Prevent this buglet from being propagated into rtl code as well. */
6776 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6777 flags
|= SYMBOL_FLAG_EXTERNAL
;
6779 SYMBOL_REF_FLAGS (symbol
) = flags
;
6782 /* By default, we do nothing for encode_section_info, so we need not
6783 do anything but discard the '*' marker. */
6786 default_strip_name_encoding (const char *str
)
6788 return str
+ (*str
== '*');
6791 #ifdef ASM_OUTPUT_DEF
6792 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6793 anchor relative to ".", the current section position. */
6796 default_asm_output_anchor (rtx symbol
)
6800 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6801 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6802 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6806 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6809 default_use_anchors_for_symbol_p (const_rtx symbol
)
6814 /* Don't use anchors for mergeable sections. The linker might move
6815 the objects around. */
6816 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6817 if (sect
->common
.flags
& SECTION_MERGE
)
6820 /* Don't use anchors for small data sections. The small data register
6821 acts as an anchor for such sections. */
6822 if (sect
->common
.flags
& SECTION_SMALL
)
6825 decl
= SYMBOL_REF_DECL (symbol
);
6826 if (decl
&& DECL_P (decl
))
6828 /* Don't use section anchors for decls that might be defined or
6829 usurped by other modules. */
6830 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
6833 /* Don't use section anchors for decls that will be placed in a
6834 small data section. */
6835 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6836 one above. The problem is that we only use SECTION_SMALL for
6837 sections that should be marked as small in the section directive. */
6838 if (targetm
.in_small_data_p (decl
))
6841 /* Don't use section anchors for decls that won't fit inside a single
6842 anchor range to reduce the amount of instructions required to refer
6843 to the entire declaration. */
6844 if (DECL_SIZE_UNIT (decl
) == NULL_TREE
6845 || !tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
))
6846 || (tree_to_uhwi (DECL_SIZE_UNIT (decl
))
6847 >= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
))
6854 /* Return true when RESOLUTION indicate that symbol will be bound to the
6855 definition provided by current .o file. */
6858 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6860 return (resolution
== LDPR_PREVAILING_DEF
6861 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6862 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6865 /* Return true when RESOLUTION indicate that symbol will be bound locally
6866 within current executable or DSO. */
6869 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6871 return (resolution
== LDPR_PREVAILING_DEF
6872 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6873 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6874 || resolution
== LDPR_PREEMPTED_REG
6875 || resolution
== LDPR_PREEMPTED_IR
6876 || resolution
== LDPR_RESOLVED_IR
6877 || resolution
== LDPR_RESOLVED_EXEC
);
6880 /* COMMON_LOCAL_P is true means that the linker can guarantee that an
6881 uninitialized common symbol in the executable will still be defined
6882 (through COPY relocation) in the executable. */
6885 default_binds_local_p_3 (const_tree exp
, bool shlib
, bool weak_dominate
,
6886 bool extern_protected_data
, bool common_local_p
)
6888 /* A non-decl is an entry in the constant pool. */
6892 /* Weakrefs may not bind locally, even though the weakref itself is always
6893 static and therefore local. Similarly, the resolver for ifunc functions
6894 might resolve to a non-local function.
6895 FIXME: We can resolve the weakref case more curefuly by looking at the
6897 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6898 || (TREE_CODE (exp
) == FUNCTION_DECL
6899 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6902 /* Static variables are always local. */
6903 if (! TREE_PUBLIC (exp
))
6906 /* With resolution file in hand, take look into resolutions.
6907 We can't just return true for resolved_locally symbols,
6908 because dynamic linking might overwrite symbols
6909 in shared libraries. */
6910 bool resolved_locally
= false;
6912 bool uninited_common
= (DECL_COMMON (exp
)
6913 && (DECL_INITIAL (exp
) == NULL
6915 && DECL_INITIAL (exp
) == error_mark_node
)));
6917 /* A non-external variable is defined locally only if it isn't
6918 uninitialized COMMON variable or common_local_p is true. */
6919 bool defined_locally
= (!DECL_EXTERNAL (exp
)
6920 && (!uninited_common
|| common_local_p
));
6921 if (symtab_node
*node
= symtab_node::get (exp
))
6923 if (node
->in_other_partition
)
6924 defined_locally
= true;
6925 if (node
->can_be_discarded_p ())
6927 else if (resolution_to_local_definition_p (node
->resolution
))
6928 defined_locally
= resolved_locally
= true;
6929 else if (resolution_local_p (node
->resolution
))
6930 resolved_locally
= true;
6932 if (defined_locally
&& weak_dominate
&& !shlib
)
6933 resolved_locally
= true;
6935 /* Undefined weak symbols are never defined locally. */
6936 if (DECL_WEAK (exp
) && !defined_locally
)
6939 /* A symbol is local if the user has said explicitly that it will be,
6940 or if we have a definition for the symbol. We cannot infer visibility
6941 for undefined symbols. */
6942 if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
6943 && (TREE_CODE (exp
) == FUNCTION_DECL
6944 || !extern_protected_data
6945 || DECL_VISIBILITY (exp
) != VISIBILITY_PROTECTED
)
6946 && (DECL_VISIBILITY_SPECIFIED (exp
) || defined_locally
))
6949 /* If PIC, then assume that any global name can be overridden by
6950 symbols resolved from other modules. */
6954 /* Variables defined outside this object might not be local. */
6955 if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6958 /* Non-dominant weak symbols are not defined locally. */
6959 if (DECL_WEAK (exp
) && !resolved_locally
)
6962 /* Uninitialized COMMON variable may be unified with symbols
6963 resolved from other modules. */
6964 if (uninited_common
&& !resolved_locally
)
6967 /* Otherwise we're left with initialized (or non-common) global data
6968 which is of necessity defined locally. */
6972 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6973 wrt cross-module name binding. */
6976 default_binds_local_p (const_tree exp
)
6978 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, false, false);
6981 /* Similar to default_binds_local_p, but common symbol may be local and
6982 extern protected data is non-local. */
6985 default_binds_local_p_2 (const_tree exp
)
6987 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, true,
6992 default_binds_local_p_1 (const_tree exp
, int shlib
)
6994 return default_binds_local_p_3 (exp
, shlib
!= 0, false, false, false);
6997 /* Return true when references to DECL must bind to current definition in
7000 The condition is usually equivalent to whether the function binds to the
7001 current module (shared library or executable), that is to binds_local_p.
7002 We use this fact to avoid need for another target hook and implement
7003 the logic using binds_local_p and just special cases where
7004 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
7005 the weak definitions (that can be overwritten at linktime by other
7006 definition from different object file) and when resolution info is available
7007 we simply use the knowledge passed to us by linker plugin. */
7009 decl_binds_to_current_def_p (const_tree decl
)
7011 gcc_assert (DECL_P (decl
));
7012 if (!targetm
.binds_local_p (decl
))
7014 if (!TREE_PUBLIC (decl
))
7017 /* When resolution is available, just use it. */
7018 if (symtab_node
*node
= symtab_node::get (decl
))
7020 if (node
->resolution
!= LDPR_UNKNOWN
7021 && !node
->can_be_discarded_p ())
7022 return resolution_to_local_definition_p (node
->resolution
);
7025 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
7026 binds locally but still can be overwritten), DECL_COMMON (can be merged
7027 with a non-common definition somewhere in the same module) or
7029 This rely on fact that binds_local_p behave as decl_replaceable_p
7030 for all other declaration types. */
7031 if (DECL_WEAK (decl
))
7033 if (DECL_COMMON (decl
)
7034 && (DECL_INITIAL (decl
) == NULL
7035 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
7037 if (DECL_EXTERNAL (decl
))
7042 /* A replaceable function or variable is one which may be replaced
7043 at link-time with an entirely different definition, provided that the
7044 replacement has the same type. For example, functions declared
7045 with __attribute__((weak)) on most systems are replaceable.
7047 COMDAT functions are not replaceable, since all definitions of the
7048 function must be equivalent. It is important that COMDAT functions
7049 not be treated as replaceable so that use of C++ template
7050 instantiations is not penalized. */
7053 decl_replaceable_p (tree decl
)
7055 gcc_assert (DECL_P (decl
));
7056 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
7058 if (!flag_semantic_interposition
7059 && !DECL_WEAK (decl
))
7061 return !decl_binds_to_current_def_p (decl
);
7064 /* Default function to output code that will globalize a label. A
7065 target must define GLOBAL_ASM_OP or provide its own function to
7066 globalize a label. */
7067 #ifdef GLOBAL_ASM_OP
7069 default_globalize_label (FILE * stream
, const char *name
)
7071 fputs (GLOBAL_ASM_OP
, stream
);
7072 assemble_name (stream
, name
);
7073 putc ('\n', stream
);
7075 #endif /* GLOBAL_ASM_OP */
7077 /* Default function to output code that will globalize a declaration. */
7079 default_globalize_decl_name (FILE * stream
, tree decl
)
7081 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
7082 targetm
.asm_out
.globalize_label (stream
, name
);
7085 /* Default function to output a label for unwind information. The
7086 default is to do nothing. A target that needs nonlocal labels for
7087 unwind information must provide its own function to do this. */
7089 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
7090 tree decl ATTRIBUTE_UNUSED
,
7091 int for_eh ATTRIBUTE_UNUSED
,
7092 int empty ATTRIBUTE_UNUSED
)
7096 /* Default function to output a label to divide up the exception table.
7097 The default is to do nothing. A target that needs/wants to divide
7098 up the table must provide it's own function to do this. */
7100 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
7104 /* This is how to output an internal numbered label where PREFIX is
7105 the class of label and LABELNO is the number within the class. */
7108 default_generate_internal_label (char *buf
, const char *prefix
,
7109 unsigned long labelno
)
7111 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7114 /* This is how to output an internal numbered label where PREFIX is
7115 the class of label and LABELNO is the number within the class. */
7118 default_internal_label (FILE *stream
, const char *prefix
,
7119 unsigned long labelno
)
7121 char *const buf
= (char *) alloca (40 + strlen (prefix
));
7122 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7123 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
7127 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
7130 default_asm_declare_constant_name (FILE *file
, const char *name
,
7131 const_tree exp ATTRIBUTE_UNUSED
,
7132 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
7134 assemble_label (file
, name
);
7137 /* This is the default behavior at the beginning of a file. It's
7138 controlled by two other target-hook toggles. */
7140 default_file_start (void)
7142 if (targetm
.asm_file_start_app_off
7143 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
7144 fputs (ASM_APP_OFF
, asm_out_file
);
7146 if (targetm
.asm_file_start_file_directive
)
7148 /* LTO produced units have no meaningful main_input_filename. */
7150 output_file_directive (asm_out_file
, "<artificial>");
7152 output_file_directive (asm_out_file
, main_input_filename
);
7156 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
7157 which emits a special section directive used to indicate whether or
7158 not this object file needs an executable stack. This is primarily
7159 a GNU extension to ELF but could be used on other targets. */
7161 int trampolines_created
;
7164 file_end_indicate_exec_stack (void)
7166 unsigned int flags
= SECTION_DEBUG
;
7167 if (trampolines_created
)
7168 flags
|= SECTION_CODE
;
7170 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
7173 /* Emit a special section directive to indicate that this object file
7174 was compiled with -fsplit-stack. This is used to let the linker
7175 detect calls between split-stack code and non-split-stack code, so
7176 that it can modify the split-stack code to allocate a sufficiently
7177 large stack. We emit another special section if there are any
7178 functions in this file which have the no_split_stack attribute, to
7179 prevent the linker from warning about being unable to convert the
7180 functions if they call non-split-stack code. */
7183 file_end_indicate_split_stack (void)
7185 if (flag_split_stack
)
7187 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
7189 if (saw_no_split_stack
)
7190 switch_to_section (get_section (".note.GNU-no-split-stack",
7191 SECTION_DEBUG
, NULL
));
7195 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
7196 a get_unnamed_section callback. */
7199 output_section_asm_op (const void *directive
)
7201 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
7204 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
7205 the current section is NEW_SECTION. */
7208 switch_to_section (section
*new_section
)
7210 if (in_section
== new_section
)
7213 if (new_section
->common
.flags
& SECTION_FORGET
)
7216 in_section
= new_section
;
7218 switch (SECTION_STYLE (new_section
))
7221 targetm
.asm_out
.named_section (new_section
->named
.name
,
7222 new_section
->named
.common
.flags
,
7223 new_section
->named
.decl
);
7226 case SECTION_UNNAMED
:
7227 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
7230 case SECTION_NOSWITCH
:
7235 new_section
->common
.flags
|= SECTION_DECLARED
;
7238 /* If block symbol SYMBOL has not yet been assigned an offset, place
7239 it at the end of its block. */
7242 place_block_symbol (rtx symbol
)
7244 unsigned HOST_WIDE_INT size
, mask
, offset
;
7245 struct constant_descriptor_rtx
*desc
;
7246 unsigned int alignment
;
7247 struct object_block
*block
;
7250 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7251 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7254 /* Work out the symbol's size and alignment. */
7255 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7257 desc
= SYMBOL_REF_CONSTANT (symbol
);
7258 alignment
= desc
->align
;
7259 size
= GET_MODE_SIZE (desc
->mode
);
7261 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7263 decl
= SYMBOL_REF_DECL (symbol
);
7264 gcc_checking_assert (DECL_IN_CONSTANT_POOL (decl
));
7265 alignment
= DECL_ALIGN (decl
);
7266 size
= get_constant_size (DECL_INITIAL (decl
));
7267 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7268 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7269 && asan_protect_global (DECL_INITIAL (decl
)))
7271 size
+= asan_red_zone_size (size
);
7272 alignment
= MAX (alignment
,
7273 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7278 struct symtab_node
*snode
;
7279 decl
= SYMBOL_REF_DECL (symbol
);
7281 snode
= symtab_node::get (decl
);
7284 rtx target
= DECL_RTL (snode
->ultimate_alias_target ()->decl
);
7286 gcc_assert (MEM_P (target
)
7287 && GET_CODE (XEXP (target
, 0)) == SYMBOL_REF
7288 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (target
, 0)));
7289 target
= XEXP (target
, 0);
7290 place_block_symbol (target
);
7291 SYMBOL_REF_BLOCK_OFFSET (symbol
) = SYMBOL_REF_BLOCK_OFFSET (target
);
7294 alignment
= get_variable_align (decl
);
7295 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7296 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7297 && asan_protect_global (decl
))
7299 size
+= asan_red_zone_size (size
);
7300 alignment
= MAX (alignment
,
7301 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7305 /* Calculate the object's offset from the start of the block. */
7306 block
= SYMBOL_REF_BLOCK (symbol
);
7307 mask
= alignment
/ BITS_PER_UNIT
- 1;
7308 offset
= (block
->size
+ mask
) & ~mask
;
7309 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7311 /* Record the block's new alignment and size. */
7312 block
->alignment
= MAX (block
->alignment
, alignment
);
7313 block
->size
= offset
+ size
;
7315 vec_safe_push (block
->objects
, symbol
);
7318 /* Return the anchor that should be used to address byte offset OFFSET
7319 from the first object in BLOCK. MODEL is the TLS model used
7323 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7324 enum tls_model model
)
7327 unsigned int begin
, middle
, end
;
7328 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7331 /* Work out the anchor's offset. Use an offset of 0 for the first
7332 anchor so that we don't pessimize the case where we take the address
7333 of a variable at the beginning of the block. This is particularly
7334 useful when a block has only one variable assigned to it.
7336 We try to place anchors RANGE bytes apart, so there can then be
7337 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7338 a ptr_mode offset. With some target settings, the lowest such
7339 anchor might be out of range for the lowest ptr_mode offset;
7340 likewise the highest anchor for the highest offset. Use anchors
7341 at the extreme ends of the ptr_mode range in such cases.
7343 All arithmetic uses unsigned integers in order to avoid
7345 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7346 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7347 range
= max_offset
- min_offset
+ 1;
7352 bias
= HOST_WIDE_INT_1U
<< (GET_MODE_BITSIZE (ptr_mode
) - 1);
7355 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7356 delta
-= delta
% range
;
7359 offset
= (HOST_WIDE_INT
) (-delta
);
7363 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7364 delta
-= delta
% range
;
7365 if (delta
> bias
- 1)
7367 offset
= (HOST_WIDE_INT
) delta
;
7371 /* Do a binary search to see if there's already an anchor we can use.
7372 Set BEGIN to the new anchor's index if not. */
7374 end
= vec_safe_length (block
->anchors
);
7375 while (begin
!= end
)
7377 middle
= (end
+ begin
) / 2;
7378 anchor
= (*block
->anchors
)[middle
];
7379 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7381 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7383 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7385 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7391 /* Create a new anchor with a unique label. */
7392 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7393 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7394 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7395 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7397 /* Insert it at index BEGIN. */
7398 vec_safe_insert (block
->anchors
, begin
, anchor
);
7402 /* Output the objects in BLOCK. */
7405 output_object_block (struct object_block
*block
)
7407 struct constant_descriptor_rtx
*desc
;
7409 HOST_WIDE_INT offset
;
7413 if (!block
->objects
)
7416 /* Switch to the section and make sure that the first byte is
7417 suitably aligned. */
7418 /* Special case VTV comdat sections similar to assemble_variable. */
7419 if (SECTION_STYLE (block
->sect
) == SECTION_NAMED
7420 && block
->sect
->named
.name
7421 && (strcmp (block
->sect
->named
.name
, ".vtable_map_vars") == 0))
7422 handle_vtv_comdat_section (block
->sect
, block
->sect
->named
.decl
);
7424 switch_to_section (block
->sect
);
7426 assemble_align (block
->alignment
);
7428 /* Define the values of all anchors relative to the current section
7430 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7431 targetm
.asm_out
.output_anchor (symbol
);
7433 /* Output the objects themselves. */
7435 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7437 /* Move to the object's offset, padding with zeros if necessary. */
7438 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7439 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7440 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7442 desc
= SYMBOL_REF_CONSTANT (symbol
);
7443 /* Pass 1 for align as we have already laid out everything in the block.
7444 So aligning shouldn't be necessary. */
7445 output_constant_pool_1 (desc
, 1);
7446 offset
+= GET_MODE_SIZE (desc
->mode
);
7448 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7451 decl
= SYMBOL_REF_DECL (symbol
);
7452 assemble_constant_contents
7453 (DECL_INITIAL (decl
), XSTR (symbol
, 0), DECL_ALIGN (decl
));
7455 size
= get_constant_size (DECL_INITIAL (decl
));
7457 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7458 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7459 && asan_protect_global (DECL_INITIAL (decl
)))
7461 size
= asan_red_zone_size (size
);
7462 assemble_zeros (size
);
7469 decl
= SYMBOL_REF_DECL (symbol
);
7470 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7471 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7473 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7474 && asan_protect_global (decl
))
7476 size
= asan_red_zone_size (size
);
7477 assemble_zeros (size
);
7484 /* A callback for qsort to compare object_blocks. */
7487 output_object_block_compare (const void *x
, const void *y
)
7489 object_block
*p1
= *(object_block
* const*)x
;
7490 object_block
*p2
= *(object_block
* const*)y
;
7492 if (p1
->sect
->common
.flags
& SECTION_NAMED
7493 && !(p2
->sect
->common
.flags
& SECTION_NAMED
))
7496 if (!(p1
->sect
->common
.flags
& SECTION_NAMED
)
7497 && p2
->sect
->common
.flags
& SECTION_NAMED
)
7500 if (p1
->sect
->common
.flags
& SECTION_NAMED
7501 && p2
->sect
->common
.flags
& SECTION_NAMED
)
7502 return strcmp (p1
->sect
->named
.name
, p2
->sect
->named
.name
);
7504 unsigned f1
= p1
->sect
->common
.flags
;
7505 unsigned f2
= p2
->sect
->common
.flags
;
7508 return f1
< f2
? -1 : 1;
7511 /* Output the definitions of all object_blocks. */
7514 output_object_blocks (void)
7516 vec
<object_block
*, va_heap
> v
;
7517 v
.create (object_block_htab
->elements ());
7519 hash_table
<object_block_hasher
>::iterator hi
;
7521 FOR_EACH_HASH_TABLE_ELEMENT (*object_block_htab
, obj
, object_block
*, hi
)
7524 /* Sort them in order to output them in a deterministic manner,
7525 otherwise we may get .rodata sections in different orders with
7527 v
.qsort (output_object_block_compare
);
7529 FOR_EACH_VEC_ELT (v
, i
, obj
)
7530 output_object_block (obj
);
7535 /* This function provides a possible implementation of the
7536 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7537 by -frecord-gcc-switches it creates a new mergeable, string section in the
7538 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7539 contains the switches in ASCII format.
7541 FIXME: This code does not correctly handle double quote characters
7542 that appear inside strings, (it strips them rather than preserving them).
7543 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7544 characters - instead it treats them as sub-string separators. Since
7545 we want to emit NUL strings terminators into the object file we have to use
7549 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7553 case SWITCH_TYPE_PASSED
:
7554 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7555 ASM_OUTPUT_SKIP (asm_out_file
, HOST_WIDE_INT_1U
);
7558 case SWITCH_TYPE_DESCRIPTIVE
:
7561 /* Distinguish between invocations where name is NULL. */
7562 static bool started
= false;
7568 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7572 | (SECTION_ENTSIZE
& 1),
7574 switch_to_section (sec
);
7583 /* The return value is currently ignored by the caller, but must be 0.
7584 For -fverbose-asm the return value would be the number of characters
7585 emitted into the assembler file. */
7589 /* Emit text to declare externally defined symbols. It is needed to
7590 properly support non-default visibility. */
7592 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7594 const char *name ATTRIBUTE_UNUSED
)
7596 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7597 set in order to avoid putting out names that are never really
7598 used. Always output visibility specified in the source. */
7599 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7600 && (DECL_VISIBILITY_SPECIFIED (decl
)
7601 || targetm
.binds_local_p (decl
)))
7602 maybe_assemble_visibility (decl
);
7605 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7608 default_asm_output_source_filename (FILE *file
, const char *name
)
7610 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7611 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7613 fprintf (file
, "\t.file\t");
7614 output_quoted_string (file
, name
);
7619 /* Output a file name in the form wanted by System V. */
7622 output_file_directive (FILE *asm_file
, const char *input_name
)
7627 if (input_name
== NULL
)
7628 input_name
= "<stdin>";
7630 input_name
= remap_debug_filename (input_name
);
7632 len
= strlen (input_name
);
7633 na
= input_name
+ len
;
7635 /* NA gets INPUT_NAME sans directory names. */
7636 while (na
> input_name
)
7638 if (IS_DIR_SEPARATOR (na
[-1]))
7643 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7646 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7649 make_debug_expr_from_rtl (const_rtx exp
)
7651 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7652 machine_mode mode
= GET_MODE (exp
);
7655 DECL_ARTIFICIAL (ddecl
) = 1;
7656 if (REG_P (exp
) && REG_EXPR (exp
))
7657 type
= TREE_TYPE (REG_EXPR (exp
));
7658 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7659 type
= TREE_TYPE (MEM_EXPR (exp
));
7662 if (type
&& TYPE_MODE (type
) == mode
)
7663 TREE_TYPE (ddecl
) = type
;
7665 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7666 SET_DECL_MODE (ddecl
, mode
);
7667 dval
= gen_rtx_DEBUG_EXPR (mode
);
7668 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7669 SET_DECL_RTL (ddecl
, dval
);
7673 #ifdef ELF_ASCII_ESCAPES
7674 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7677 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7682 fputs (STRING_ASM_OP
, f
);
7687 escape
= ELF_ASCII_ESCAPES
[c
];
7695 putc ('0'+((c
>>6)&7), f
);
7696 putc ('0'+((c
>>3)&7), f
);
7697 putc ('0'+(c
&7), f
);
7710 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7713 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7715 const char *limit
= s
+ len
;
7716 const char *last_null
= NULL
;
7717 unsigned bytes_in_chunk
= 0;
7721 for (; s
< limit
; s
++)
7725 if (bytes_in_chunk
>= 60)
7734 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7741 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7743 if (bytes_in_chunk
> 0)
7750 default_elf_asm_output_limited_string (f
, s
);
7755 if (bytes_in_chunk
== 0)
7756 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7759 escape
= ELF_ASCII_ESCAPES
[c
];
7768 putc ('0'+((c
>>6)&7), f
);
7769 putc ('0'+((c
>>3)&7), f
);
7770 putc ('0'+(c
&7), f
);
7771 bytes_in_chunk
+= 4;
7776 bytes_in_chunk
+= 2;
7783 if (bytes_in_chunk
> 0)
7791 static GTY(()) section
*elf_init_array_section
;
7792 static GTY(()) section
*elf_fini_array_section
;
7795 get_elf_initfini_array_priority_section (int priority
,
7799 if (priority
!= DEFAULT_INIT_PRIORITY
)
7802 sprintf (buf
, "%s.%.5u",
7803 constructor_p
? ".init_array" : ".fini_array",
7805 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7811 if (elf_init_array_section
== NULL
)
7812 elf_init_array_section
7813 = get_section (".init_array",
7814 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7815 sec
= elf_init_array_section
;
7819 if (elf_fini_array_section
== NULL
)
7820 elf_fini_array_section
7821 = get_section (".fini_array",
7822 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7823 sec
= elf_fini_array_section
;
7829 /* Use .init_array section for constructors. */
7832 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7834 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7836 assemble_addr_to_section (symbol
, sec
);
7839 /* Use .fini_array section for destructors. */
7842 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7844 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7846 assemble_addr_to_section (symbol
, sec
);
7849 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7851 This is a bit of a cheat. The real default is a no-op, but this
7852 hook is the default for all targets with a .ident directive. */
7855 default_asm_output_ident_directive (const char *ident_str
)
7857 const char *ident_asm_op
= "\t.ident\t";
7859 /* If we are still in the front end, do not write out the string
7860 to asm_out_file. Instead, add a fake top-level asm statement.
7861 This allows the front ends to use this hook without actually
7862 writing to asm_out_file, to handle #ident or Pragma Ident. */
7863 if (symtab
->state
== PARSING
)
7865 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7866 symtab
->finalize_toplevel_asm (build_string (strlen (buf
), buf
));
7869 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7873 /* This function ensures that vtable_map variables are not only
7874 in the comdat section, but that each variable has its own unique
7875 comdat name. Without this the variables end up in the same section
7876 with a single comdat name.
7878 FIXME: resolve_unique_section needs to deal better with
7879 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
7880 that is fixed, this if-else statement can be replaced with
7881 a single call to "switch_to_section (sect)". */
7884 handle_vtv_comdat_section (section
*sect
, const_tree decl ATTRIBUTE_UNUSED
)
7886 #if defined (OBJECT_FORMAT_ELF)
7887 targetm
.asm_out
.named_section (sect
->named
.name
,
7888 sect
->named
.common
.flags
7893 /* Neither OBJECT_FORMAT_PE, nor OBJECT_FORMAT_COFF is set here.
7894 Therefore the following check is used.
7895 In case a the target is PE or COFF a comdat group section
7896 is created, e.g. .vtable_map_vars$foo. The linker places
7897 everything in .vtable_map_vars at the end.
7899 A fix could be made in
7900 gcc/config/i386/winnt.c: i386_pe_unique_section. */
7905 if (TREE_CODE (DECL_NAME (decl
)) == IDENTIFIER_NODE
)
7906 name
= ACONCAT ((sect
->named
.name
, "$",
7907 IDENTIFIER_POINTER (DECL_NAME (decl
)), NULL
));
7909 name
= ACONCAT ((sect
->named
.name
, "$",
7910 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (DECL_NAME (decl
))),
7913 targetm
.asm_out
.named_section (name
,
7914 sect
->named
.common
.flags
7920 switch_to_section (sect
);
7924 #include "gt-varasm.h"