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 TRUE if and only if the constant pool has no entries. Note
3812 that even entries we might end up choosing not to emit are counted
3813 here, so there is the potential for missed optimizations. */
3816 constant_pool_empty_p (void)
3818 return crtl
->varasm
.pool
->first
== NULL
;
3821 /* Worker function for output_constant_pool_1. Emit assembly for X
3822 in MODE with known alignment ALIGN. */
3825 output_constant_pool_2 (machine_mode mode
, rtx x
, unsigned int align
)
3827 switch (GET_MODE_CLASS (mode
))
3830 case MODE_DECIMAL_FLOAT
:
3832 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3833 assemble_real (*CONST_DOUBLE_REAL_VALUE (x
), mode
, align
, false);
3838 case MODE_PARTIAL_INT
:
3843 case MODE_POINTER_BOUNDS
:
3844 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3847 case MODE_VECTOR_FLOAT
:
3848 case MODE_VECTOR_INT
:
3849 case MODE_VECTOR_FRACT
:
3850 case MODE_VECTOR_UFRACT
:
3851 case MODE_VECTOR_ACCUM
:
3852 case MODE_VECTOR_UACCUM
:
3855 machine_mode submode
= GET_MODE_INNER (mode
);
3856 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3858 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3859 units
= CONST_VECTOR_NUNITS (x
);
3861 for (i
= 0; i
< units
; i
++)
3863 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3864 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3874 /* Worker function for output_constant_pool. Emit constant DESC,
3875 giving it ALIGN bits of alignment. */
3878 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3885 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3886 whose CODE_LABEL has been deleted. This can occur if a jump table
3887 is eliminated by optimization. If so, write a constant of zero
3888 instead. Note that this can also happen by turning the
3889 CODE_LABEL into a NOTE. */
3890 /* ??? This seems completely and utterly wrong. Certainly it's
3891 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3892 functioning even with rtx_insn::deleted and friends. */
3895 switch (GET_CODE (tmp
))
3898 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3899 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3901 tmp
= XEXP (XEXP (tmp
, 0), 0);
3906 rtx_insn
*insn
= label_ref_label (tmp
);
3907 gcc_assert (!insn
->deleted ());
3908 gcc_assert (!NOTE_P (insn
)
3909 || NOTE_KIND (insn
) != NOTE_INSN_DELETED
);
3917 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3918 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3919 align
, desc
->labelno
, done
);
3922 assemble_align (align
);
3924 /* Output the label. */
3925 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3928 Pass actual alignment value while emitting string constant to asm code
3929 as function 'output_constant_pool_1' explicitly passes the alignment as 1
3930 assuming that the data is already aligned which prevents the generation
3931 of fix-up table entries. */
3932 output_constant_pool_2 (desc
->mode
, x
, desc
->align
);
3934 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3935 sections have proper size. */
3936 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3938 && (in_section
->common
.flags
& SECTION_MERGE
))
3939 assemble_align (align
);
3941 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3947 /* Recompute the offsets of entries in POOL, and the overall size of
3948 POOL. Do this after calling mark_constant_pool to ensure that we
3949 are computing the offset values for the pool which we will actually
3953 recompute_pool_offsets (struct rtx_constant_pool
*pool
)
3955 struct constant_descriptor_rtx
*desc
;
3958 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3961 /* Recalculate offset. */
3962 unsigned int align
= desc
->align
;
3963 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3964 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3965 desc
->offset
= pool
->offset
;
3966 pool
->offset
+= GET_MODE_SIZE (desc
->mode
);
3970 /* Mark all constants that are referenced by SYMBOL_REFs in X.
3971 Emit referenced deferred strings. */
3974 mark_constants_in_pattern (rtx insn
)
3976 subrtx_iterator::array_type array
;
3977 FOR_EACH_SUBRTX (iter
, array
, PATTERN (insn
), ALL
)
3979 const_rtx x
= *iter
;
3980 if (GET_CODE (x
) == SYMBOL_REF
)
3982 if (CONSTANT_POOL_ADDRESS_P (x
))
3984 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3985 if (desc
->mark
== 0)
3988 iter
.substitute (desc
->constant
);
3991 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3993 tree decl
= SYMBOL_REF_DECL (x
);
3994 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
3996 n_deferred_constants
--;
3997 output_constant_def_contents (CONST_CAST_RTX (x
));
4004 /* Look through appropriate parts of INSN, marking all entries in the
4005 constant pool which are actually being used. Entries that are only
4006 referenced by other constants are also marked as used. Emit
4007 deferred strings that are used. */
4010 mark_constants (rtx_insn
*insn
)
4015 /* Insns may appear inside a SEQUENCE. Only check the patterns of
4016 insns, not any notes that may be attached. We don't want to mark
4017 a constant just because it happens to appear in a REG_EQUIV note. */
4018 if (rtx_sequence
*seq
= dyn_cast
<rtx_sequence
*> (PATTERN (insn
)))
4020 int i
, n
= seq
->len ();
4021 for (i
= 0; i
< n
; ++i
)
4023 rtx subinsn
= seq
->element (i
);
4024 if (INSN_P (subinsn
))
4025 mark_constants_in_pattern (subinsn
);
4029 mark_constants_in_pattern (insn
);
4032 /* Look through the instructions for this function, and mark all the
4033 entries in POOL which are actually being used. Emit deferred constants
4034 which have indeed been used. */
4037 mark_constant_pool (void)
4041 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
4044 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
4045 mark_constants (insn
);
4048 /* Write all the constants in POOL. */
4051 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
4053 struct constant_descriptor_rtx
*desc
;
4055 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
4058 /* If the constant is part of an object_block, make sure that
4059 the constant has been positioned within its block, but do not
4060 write out its definition yet. output_object_blocks will do
4062 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
4063 && SYMBOL_REF_BLOCK (desc
->sym
))
4064 place_block_symbol (desc
->sym
);
4067 switch_to_section (targetm
.asm_out
.select_rtx_section
4068 (desc
->mode
, desc
->constant
, desc
->align
));
4069 output_constant_pool_1 (desc
, desc
->align
);
4074 /* Mark all constants that are used in the current function, then write
4075 out the function's private constant pool. */
4078 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
4079 tree fndecl ATTRIBUTE_UNUSED
)
4081 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
4083 /* It is possible for gcc to call force_const_mem and then to later
4084 discard the instructions which refer to the constant. In such a
4085 case we do not need to output the constant. */
4086 mark_constant_pool ();
4088 /* Having marked the constant pool entries we'll actually emit, we
4089 now need to rebuild the offset information, which may have become
4091 recompute_pool_offsets (pool
);
4093 #ifdef ASM_OUTPUT_POOL_PROLOGUE
4094 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4097 output_constant_pool_contents (pool
);
4099 #ifdef ASM_OUTPUT_POOL_EPILOGUE
4100 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4104 /* Write the contents of the shared constant pool. */
4107 output_shared_constant_pool (void)
4109 output_constant_pool_contents (shared_constant_pool
);
4112 /* Determine what kind of relocations EXP may need. */
4115 compute_reloc_for_constant (tree exp
)
4117 int reloc
= 0, reloc2
;
4120 switch (TREE_CODE (exp
))
4124 /* Go inside any operations that get_inner_reference can handle and see
4125 if what's inside is a constant: no need to do anything here for
4126 addresses of variables or functions. */
4127 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4128 tem
= TREE_OPERAND (tem
, 0))
4131 if (TREE_CODE (tem
) == MEM_REF
4132 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
4134 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
4138 if (!targetm
.binds_local_p (tem
))
4145 case POINTER_PLUS_EXPR
:
4146 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4147 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4151 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4152 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4153 /* The difference of two local labels is computable at link time. */
4154 if (reloc
== 1 && reloc2
== 1)
4161 case VIEW_CONVERT_EXPR
:
4162 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4167 unsigned HOST_WIDE_INT idx
;
4168 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4170 reloc
|= compute_reloc_for_constant (tem
);
4180 /* Find all the constants whose addresses are referenced inside of EXP,
4181 and make sure assembler code with a label has been output for each one.
4182 Indicate whether an ADDR_EXPR has been encountered. */
4185 output_addressed_constants (tree exp
)
4189 switch (TREE_CODE (exp
))
4193 /* Go inside any operations that get_inner_reference can handle and see
4194 if what's inside is a constant: no need to do anything here for
4195 addresses of variables or functions. */
4196 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4197 tem
= TREE_OPERAND (tem
, 0))
4200 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4201 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4202 tem
= DECL_INITIAL (tem
);
4204 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4205 output_constant_def (tem
, 0);
4207 if (TREE_CODE (tem
) == MEM_REF
)
4208 output_addressed_constants (TREE_OPERAND (tem
, 0));
4212 case POINTER_PLUS_EXPR
:
4214 output_addressed_constants (TREE_OPERAND (exp
, 1));
4218 case VIEW_CONVERT_EXPR
:
4219 output_addressed_constants (TREE_OPERAND (exp
, 0));
4224 unsigned HOST_WIDE_INT idx
;
4225 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4227 output_addressed_constants (tem
);
4236 /* Whether a constructor CTOR is a valid static constant initializer if all
4237 its elements are. This used to be internal to initializer_constant_valid_p
4238 and has been exposed to let other functions like categorize_ctor_elements
4239 evaluate the property while walking a constructor for other purposes. */
4242 constructor_static_from_elts_p (const_tree ctor
)
4244 return (TREE_CONSTANT (ctor
)
4245 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4246 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4247 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4250 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4253 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4254 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4255 which are valid when ENDTYPE is an integer of any size; in
4256 particular, this does not accept a pointer minus a constant. This
4257 returns null_pointer_node if the VALUE is an absolute constant
4258 which can be used to initialize a static variable. Otherwise it
4262 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4266 if (!INTEGRAL_TYPE_P (endtype
))
4269 op0
= TREE_OPERAND (value
, 0);
4270 op1
= TREE_OPERAND (value
, 1);
4272 /* Like STRIP_NOPS except allow the operand mode to widen. This
4273 works around a feature of fold that simplifies (int)(p1 - p2) to
4274 ((int)p1 - (int)p2) under the theory that the narrower operation
4277 while (CONVERT_EXPR_P (op0
)
4278 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4280 tree inner
= TREE_OPERAND (op0
, 0);
4281 if (inner
== error_mark_node
4282 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4283 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4284 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4289 while (CONVERT_EXPR_P (op1
)
4290 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4292 tree inner
= TREE_OPERAND (op1
, 0);
4293 if (inner
== error_mark_node
4294 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4295 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4296 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4301 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4305 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4306 cache
? cache
+ 2 : NULL
);
4307 /* Both initializers must be known. */
4311 && (op0
== null_pointer_node
4312 || TREE_CODE (value
) == MINUS_EXPR
))
4313 return null_pointer_node
;
4315 /* Support differences between labels. */
4316 if (TREE_CODE (op0
) == LABEL_DECL
4317 && TREE_CODE (op1
) == LABEL_DECL
)
4318 return null_pointer_node
;
4320 if (TREE_CODE (op0
) == STRING_CST
4321 && TREE_CODE (op1
) == STRING_CST
4322 && operand_equal_p (op0
, op1
, 1))
4323 return null_pointer_node
;
4329 /* Helper function of initializer_constant_valid_p.
4330 Return nonzero if VALUE is a valid constant-valued expression
4331 for use in initializing a static variable; one that can be an
4332 element of a "constant" initializer.
4334 Return null_pointer_node if the value is absolute;
4335 if it is relocatable, return the variable that determines the relocation.
4336 We assume that VALUE has been folded as much as possible;
4337 therefore, we do not need to check for such things as
4338 arithmetic-combinations of integers.
4340 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4343 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4347 switch (TREE_CODE (value
))
4350 if (constructor_static_from_elts_p (value
))
4352 unsigned HOST_WIDE_INT idx
;
4354 bool absolute
= true;
4356 if (cache
&& cache
[0] == value
)
4358 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4361 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4364 /* An absolute value is required with reverse SSO. */
4365 || (reloc
!= null_pointer_node
4366 && TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (value
))
4367 && !AGGREGATE_TYPE_P (TREE_TYPE (elt
))))
4372 cache
[1] = NULL_TREE
;
4376 if (reloc
!= null_pointer_node
)
4379 /* For a non-absolute relocation, there is no single
4380 variable that can be "the variable that determines the
4385 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4387 return absolute
? null_pointer_node
: error_mark_node
;
4390 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4398 return null_pointer_node
;
4403 tree op0
= staticp (TREE_OPERAND (value
, 0));
4406 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4407 to be a constant, this is old-skool offsetof-like nonsense. */
4408 if (TREE_CODE (op0
) == INDIRECT_REF
4409 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4410 return null_pointer_node
;
4411 /* Taking the address of a nested function involves a trampoline,
4412 unless we don't need or want one. */
4413 if (TREE_CODE (op0
) == FUNCTION_DECL
4414 && DECL_STATIC_CHAIN (op0
)
4415 && !TREE_NO_TRAMPOLINE (value
))
4417 /* "&{...}" requires a temporary to hold the constructed
4419 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4425 case NON_LVALUE_EXPR
:
4426 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4429 case VIEW_CONVERT_EXPR
:
4431 tree src
= TREE_OPERAND (value
, 0);
4432 tree src_type
= TREE_TYPE (src
);
4433 tree dest_type
= TREE_TYPE (value
);
4435 /* Allow view-conversions from aggregate to non-aggregate type only
4436 if the bit pattern is fully preserved afterwards; otherwise, the
4437 RTL expander won't be able to apply a subsequent transformation
4438 to the underlying constructor. */
4439 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4441 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4442 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4447 /* Allow all other kinds of view-conversion. */
4448 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4453 tree src
= TREE_OPERAND (value
, 0);
4454 tree src_type
= TREE_TYPE (src
);
4455 tree dest_type
= TREE_TYPE (value
);
4457 /* Allow conversions between pointer types, floating-point
4458 types, and offset types. */
4459 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4460 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4461 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4462 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4463 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4465 /* Allow length-preserving conversions between integer types. */
4466 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4467 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4468 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4470 /* Allow conversions between other integer types only if
4472 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4474 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4475 if (inner
== null_pointer_node
)
4476 return null_pointer_node
;
4480 /* Allow (int) &foo provided int is as wide as a pointer. */
4481 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4482 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4483 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4485 /* Likewise conversions from int to pointers, but also allow
4486 conversions from 0. */
4487 if ((POINTER_TYPE_P (dest_type
)
4488 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4489 && INTEGRAL_TYPE_P (src_type
))
4491 if (TREE_CODE (src
) == INTEGER_CST
4492 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4493 return null_pointer_node
;
4494 if (integer_zerop (src
))
4495 return null_pointer_node
;
4496 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4497 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4500 /* Allow conversions to struct or union types if the value
4502 if (TREE_CODE (dest_type
) == RECORD_TYPE
4503 || TREE_CODE (dest_type
) == UNION_TYPE
)
4504 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4508 case POINTER_PLUS_EXPR
:
4510 /* Any valid floating-point constants will have been folded by now;
4511 with -frounding-math we hit this with addition of two constants. */
4512 if (TREE_CODE (endtype
) == REAL_TYPE
)
4514 if (cache
&& cache
[0] == value
)
4516 if (! INTEGRAL_TYPE_P (endtype
)
4517 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4519 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4521 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4524 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4525 endtype
, ncache
+ 2);
4526 /* If either term is absolute, use the other term's relocation. */
4527 if (valid0
== null_pointer_node
)
4529 else if (valid1
== null_pointer_node
)
4531 /* Support narrowing pointer differences. */
4533 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4537 /* Support narrowing pointer differences. */
4538 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4547 if (TREE_CODE (endtype
) == REAL_TYPE
)
4549 if (cache
&& cache
[0] == value
)
4551 if (! INTEGRAL_TYPE_P (endtype
)
4552 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4554 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4556 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4559 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4560 endtype
, ncache
+ 2);
4561 /* Win if second argument is absolute. */
4562 if (valid1
== null_pointer_node
)
4564 /* Win if both arguments have the same relocation.
4565 Then the value is absolute. */
4566 else if (valid0
== valid1
&& valid0
!= 0)
4567 ret
= null_pointer_node
;
4568 /* Since GCC guarantees that string constants are unique in the
4569 generated code, a subtraction between two copies of the same
4570 constant string is absolute. */
4571 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4572 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4573 && operand_equal_p (valid0
, valid1
, 1))
4574 ret
= null_pointer_node
;
4575 /* Support narrowing differences. */
4577 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4581 /* Support narrowing differences. */
4582 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4597 /* Return nonzero if VALUE is a valid constant-valued expression
4598 for use in initializing a static variable; one that can be an
4599 element of a "constant" initializer.
4601 Return null_pointer_node if the value is absolute;
4602 if it is relocatable, return the variable that determines the relocation.
4603 We assume that VALUE has been folded as much as possible;
4604 therefore, we do not need to check for such things as
4605 arithmetic-combinations of integers. */
4607 initializer_constant_valid_p (tree value
, tree endtype
, bool reverse
)
4609 tree reloc
= initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4611 /* An absolute value is required with reverse storage order. */
4613 && reloc
!= null_pointer_node
4615 && !AGGREGATE_TYPE_P (endtype
)
4616 && !VECTOR_TYPE_P (endtype
))
4622 /* Return true if VALUE is a valid constant-valued expression
4623 for use in initializing a static bit-field; one that can be
4624 an element of a "constant" initializer. */
4627 initializer_constant_valid_for_bitfield_p (tree value
)
4629 /* For bitfields we support integer constants or possibly nested aggregates
4631 switch (TREE_CODE (value
))
4635 unsigned HOST_WIDE_INT idx
;
4638 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4639 if (!initializer_constant_valid_for_bitfield_p (elt
))
4648 case VIEW_CONVERT_EXPR
:
4649 case NON_LVALUE_EXPR
:
4651 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4660 /* output_constructor outer state of relevance in recursive calls, typically
4661 for nested aggregate bitfields. */
4663 struct oc_outer_state
{
4664 unsigned int bit_offset
; /* current position in ... */
4665 int byte
; /* ... the outer byte buffer. */
4668 static unsigned HOST_WIDE_INT
4669 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int, bool,
4672 /* Output assembler code for constant EXP, with no label.
4673 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4674 Assumes output_addressed_constants has been done on EXP already.
4676 Generate at least SIZE bytes of assembler data, padding at the end
4677 with zeros if necessary. SIZE must always be specified. The returned
4678 value is the actual number of bytes of assembler data generated, which
4679 may be bigger than SIZE if the object contains a variable length field.
4681 SIZE is important for structure constructors,
4682 since trailing members may have been omitted from the constructor.
4683 It is also important for initialization of arrays from string constants
4684 since the full length of the string constant might not be wanted.
4685 It is also needed for initialization of unions, where the initializer's
4686 type is just one member, and that may not be as long as the union.
4688 There a case in which we would fail to output exactly SIZE bytes:
4689 for a structure constructor that wants to produce more than SIZE bytes.
4690 But such constructors will never be generated for any possible input.
4692 ALIGN is the alignment of the data in bits.
4694 If REVERSE is true, EXP is output in reverse storage order. */
4696 static unsigned HOST_WIDE_INT
4697 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
,
4700 enum tree_code code
;
4701 unsigned HOST_WIDE_INT thissize
;
4704 if (size
== 0 || flag_syntax_only
)
4707 /* See if we're trying to initialize a pointer in a non-default mode
4708 to the address of some declaration somewhere. If the target says
4709 the mode is valid for pointers, assume the target has a way of
4711 if (TREE_CODE (exp
) == NOP_EXPR
4712 && POINTER_TYPE_P (TREE_TYPE (exp
))
4713 && targetm
.addr_space
.valid_pointer_mode
4714 (TYPE_MODE (TREE_TYPE (exp
)),
4715 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4717 tree saved_type
= TREE_TYPE (exp
);
4719 /* Peel off any intermediate conversions-to-pointer for valid
4721 while (TREE_CODE (exp
) == NOP_EXPR
4722 && POINTER_TYPE_P (TREE_TYPE (exp
))
4723 && targetm
.addr_space
.valid_pointer_mode
4724 (TYPE_MODE (TREE_TYPE (exp
)),
4725 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4726 exp
= TREE_OPERAND (exp
, 0);
4728 /* If what we're left with is the address of something, we can
4729 convert the address to the final type and output it that
4731 if (TREE_CODE (exp
) == ADDR_EXPR
)
4732 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4733 /* Likewise for constant ints. */
4734 else if (TREE_CODE (exp
) == INTEGER_CST
)
4735 exp
= fold_convert (saved_type
, exp
);
4739 /* Eliminate any conversions since we'll be outputting the underlying
4741 while (CONVERT_EXPR_P (exp
)
4742 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4743 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4745 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4746 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4748 /* Make sure eliminating the conversion is really a no-op, except with
4749 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4750 union types to allow for Ada unchecked unions. */
4751 if (type_size
> op_size
4752 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4753 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4754 /* Keep the conversion. */
4757 exp
= TREE_OPERAND (exp
, 0);
4760 code
= TREE_CODE (TREE_TYPE (exp
));
4761 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4763 /* Allow a constructor with no elements for any data type.
4764 This means to fill the space with zeros. */
4765 if (TREE_CODE (exp
) == CONSTRUCTOR
4766 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4768 assemble_zeros (size
);
4772 if (TREE_CODE (exp
) == FDESC_EXPR
)
4774 #ifdef ASM_OUTPUT_FDESC
4775 HOST_WIDE_INT part
= tree_to_shwi (TREE_OPERAND (exp
, 1));
4776 tree decl
= TREE_OPERAND (exp
, 0);
4777 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4784 /* Now output the underlying data. If we've handling the padding, return.
4785 Otherwise, break and ensure SIZE is the size written. */
4792 case REFERENCE_TYPE
:
4794 case FIXED_POINT_TYPE
:
4795 case POINTER_BOUNDS_TYPE
:
4797 cst
= expand_expr (exp
, NULL_RTX
, VOIDmode
, EXPAND_INITIALIZER
);
4799 cst
= flip_storage_order (TYPE_MODE (TREE_TYPE (exp
)), cst
);
4800 if (!assemble_integer (cst
, MIN (size
, thissize
), align
, 0))
4801 error ("initializer for integer/fixed-point value is too complicated");
4805 if (TREE_CODE (exp
) != REAL_CST
)
4806 error ("initializer for floating value is not a floating constant");
4808 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)),
4813 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
, reverse
);
4814 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4815 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)),
4821 switch (TREE_CODE (exp
))
4824 return output_constructor (exp
, size
, align
, reverse
, NULL
);
4827 = MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
), size
);
4828 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4832 machine_mode inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4833 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4834 int elt_size
= GET_MODE_SIZE (inner
);
4835 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
,
4837 thissize
= elt_size
;
4838 for (unsigned int i
= 1; i
< VECTOR_CST_NELTS (exp
); i
++)
4840 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
,
4842 thissize
+= elt_size
;
4853 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4854 return output_constructor (exp
, size
, align
, reverse
, NULL
);
4863 if (size
> thissize
)
4864 assemble_zeros (size
- thissize
);
4869 /* Subroutine of output_constructor, used for computing the size of
4870 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4871 type with an unspecified upper bound. */
4873 static unsigned HOST_WIDE_INT
4874 array_size_for_constructor (tree val
)
4877 unsigned HOST_WIDE_INT cnt
;
4878 tree index
, value
, tmp
;
4881 /* This code used to attempt to handle string constants that are not
4882 arrays of single-bytes, but nothing else does, so there's no point in
4884 if (TREE_CODE (val
) == STRING_CST
)
4885 return TREE_STRING_LENGTH (val
);
4887 max_index
= NULL_TREE
;
4888 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4890 if (TREE_CODE (index
) == RANGE_EXPR
)
4891 index
= TREE_OPERAND (index
, 1);
4892 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4896 if (max_index
== NULL_TREE
)
4899 /* Compute the total number of array elements. */
4900 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4901 i
= wi::to_offset (max_index
) - wi::to_offset (tmp
) + 1;
4903 /* Multiply by the array element unit size to find number of bytes. */
4904 i
*= wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4906 gcc_assert (wi::fits_uhwi_p (i
));
4907 return i
.to_uhwi ();
4910 /* Other datastructures + helpers for output_constructor. */
4912 /* output_constructor local state to support interaction with helpers. */
4914 struct oc_local_state
{
4916 /* Received arguments. */
4917 tree exp
; /* Constructor expression. */
4918 tree type
; /* Type of constructor expression. */
4919 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4920 unsigned int align
; /* Known initial alignment. */
4921 tree min_index
; /* Lower bound if specified for an array. */
4923 /* Output processing state. */
4924 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4925 int byte
; /* Part of a bitfield byte yet to be output. */
4926 int last_relative_index
; /* Implicit or explicit index of the last
4927 array element output within a bitfield. */
4928 bool byte_buffer_in_use
; /* Whether BYTE is in use. */
4929 bool reverse
; /* Whether reverse storage order is in use. */
4931 /* Current element. */
4932 tree field
; /* Current field decl in a record. */
4933 tree val
; /* Current element value. */
4934 tree index
; /* Current element index. */
4938 /* Helper for output_constructor. From the current LOCAL state, output a
4939 RANGE_EXPR element. */
4942 output_constructor_array_range (oc_local_state
*local
)
4944 unsigned HOST_WIDE_INT fieldsize
4945 = int_size_in_bytes (TREE_TYPE (local
->type
));
4947 HOST_WIDE_INT lo_index
4948 = tree_to_shwi (TREE_OPERAND (local
->index
, 0));
4949 HOST_WIDE_INT hi_index
4950 = tree_to_shwi (TREE_OPERAND (local
->index
, 1));
4951 HOST_WIDE_INT index
;
4954 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4956 for (index
= lo_index
; index
<= hi_index
; index
++)
4958 /* Output the element's initial value. */
4959 if (local
->val
== NULL_TREE
)
4960 assemble_zeros (fieldsize
);
4963 = output_constant (local
->val
, fieldsize
, align2
, local
->reverse
);
4965 /* Count its size. */
4966 local
->total_bytes
+= fieldsize
;
4970 /* Helper for output_constructor. From the current LOCAL state, output a
4971 field element that is not true bitfield or part of an outer one. */
4974 output_constructor_regular_field (oc_local_state
*local
)
4976 /* Field size and position. Since this structure is static, we know the
4977 positions are constant. */
4978 unsigned HOST_WIDE_INT fieldsize
;
4979 HOST_WIDE_INT fieldpos
;
4981 unsigned int align2
;
4983 /* Output any buffered-up bit-fields preceding this element. */
4984 if (local
->byte_buffer_in_use
)
4986 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4987 local
->total_bytes
++;
4988 local
->byte_buffer_in_use
= false;
4991 if (local
->index
!= NULL_TREE
)
4993 /* Perform the index calculation in modulo arithmetic but
4994 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4995 but we are using an unsigned sizetype. */
4996 unsigned prec
= TYPE_PRECISION (sizetype
);
4997 offset_int idx
= wi::sext (wi::to_offset (local
->index
)
4998 - wi::to_offset (local
->min_index
), prec
);
4999 fieldpos
= (idx
* wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
))))
5002 else if (local
->field
!= NULL_TREE
)
5003 fieldpos
= int_byte_position (local
->field
);
5007 /* Advance to offset of this element.
5008 Note no alignment needed in an array, since that is guaranteed
5009 if each element has the proper size. */
5010 if (local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
5012 if (fieldpos
> local
->total_bytes
)
5014 assemble_zeros (fieldpos
- local
->total_bytes
);
5015 local
->total_bytes
= fieldpos
;
5018 /* Must not go backwards. */
5019 gcc_assert (fieldpos
== local
->total_bytes
);
5022 /* Find the alignment of this element. */
5023 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
5025 /* Determine size this element should occupy. */
5030 /* If this is an array with an unspecified upper bound,
5031 the initializer determines the size. */
5032 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
5033 but we cannot do this until the deprecated support for
5034 initializing zero-length array members is removed. */
5035 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
5036 && (!TYPE_DOMAIN (TREE_TYPE (local
->field
))
5037 || !TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
)))))
5039 fieldsize
= array_size_for_constructor (local
->val
);
5040 /* Given a non-empty initialization, this field had better
5041 be last. Given a flexible array member, the next field
5042 on the chain is a TYPE_DECL of the enclosing struct. */
5043 const_tree next
= DECL_CHAIN (local
->field
);
5044 gcc_assert (!fieldsize
|| !next
|| TREE_CODE (next
) != FIELD_DECL
);
5047 fieldsize
= tree_to_uhwi (DECL_SIZE_UNIT (local
->field
));
5050 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
5052 /* Output the element's initial value. */
5053 if (local
->val
== NULL_TREE
)
5054 assemble_zeros (fieldsize
);
5057 = output_constant (local
->val
, fieldsize
, align2
, local
->reverse
);
5059 /* Count its size. */
5060 local
->total_bytes
+= fieldsize
;
5063 /* Helper for output_constructor. From the LOCAL state, output an element
5064 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
5065 from the start of a possibly ongoing outer byte buffer. */
5068 output_constructor_bitfield (oc_local_state
*local
, unsigned int bit_offset
)
5070 /* Bit size of this element. */
5071 HOST_WIDE_INT ebitsize
5073 ? tree_to_uhwi (DECL_SIZE (local
->field
))
5074 : tree_to_uhwi (TYPE_SIZE (TREE_TYPE (local
->type
))));
5076 /* Relative index of this element if this is an array component. */
5077 HOST_WIDE_INT relative_index
5080 ? (tree_to_shwi (local
->index
)
5081 - tree_to_shwi (local
->min_index
))
5082 : local
->last_relative_index
+ 1)
5085 /* Bit position of this element from the start of the containing
5087 HOST_WIDE_INT constructor_relative_ebitpos
5089 ? int_bit_position (local
->field
)
5090 : ebitsize
* relative_index
);
5092 /* Bit position of this element from the start of a possibly ongoing
5093 outer byte buffer. */
5094 HOST_WIDE_INT byte_relative_ebitpos
5095 = bit_offset
+ constructor_relative_ebitpos
;
5097 /* From the start of a possibly ongoing outer byte buffer, offsets to
5098 the first bit of this element and to the first bit past the end of
5100 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
5101 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
5103 local
->last_relative_index
= relative_index
;
5105 if (local
->val
== NULL_TREE
)
5106 local
->val
= integer_zero_node
;
5108 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
5109 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
5110 local
->val
= TREE_OPERAND (local
->val
, 0);
5112 if (TREE_CODE (local
->val
) != INTEGER_CST
5113 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
5115 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
5119 /* If this field does not start in this (or next) byte, skip some bytes. */
5120 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5122 /* Output remnant of any bit field in previous bytes. */
5123 if (local
->byte_buffer_in_use
)
5125 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5126 local
->total_bytes
++;
5127 local
->byte_buffer_in_use
= false;
5130 /* If still not at proper byte, advance to there. */
5131 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5133 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
5134 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
5135 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
5139 /* Set up the buffer if necessary. */
5140 if (!local
->byte_buffer_in_use
)
5144 local
->byte_buffer_in_use
= true;
5147 /* If this is nested constructor, recurse passing the bit offset and the
5148 pending data, then retrieve the new pending data afterwards. */
5149 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
5151 oc_outer_state temp_state
;
5152 temp_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
5153 temp_state
.byte
= local
->byte
;
5155 += output_constructor (local
->val
, 0, 0, local
->reverse
, &temp_state
);
5156 local
->byte
= temp_state
.byte
;
5160 /* Otherwise, we must split the element into pieces that fall within
5161 separate bytes, and combine each byte with previous or following
5163 while (next_offset
< end_offset
)
5167 HOST_WIDE_INT value
;
5168 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
5169 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
5171 /* Advance from byte to byte within this element when necessary. */
5172 while (next_byte
!= local
->total_bytes
)
5174 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5175 local
->total_bytes
++;
5179 /* Number of bits we can process at once (all part of the same byte). */
5180 this_time
= MIN (end_offset
- next_offset
, BITS_PER_UNIT
- next_bit
);
5181 if (local
->reverse
? !BYTES_BIG_ENDIAN
: BYTES_BIG_ENDIAN
)
5183 /* For big-endian data, take the most significant bits (of the
5184 bits that are significant) first and put them into bytes from
5185 the most significant end. */
5186 shift
= end_offset
- next_offset
- this_time
;
5188 /* Don't try to take a bunch of bits that cross
5189 the word boundary in the INTEGER_CST. We can
5190 only select bits from one element. */
5191 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5192 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5194 const int end
= shift
+ this_time
- 1;
5195 shift
= end
& -HOST_BITS_PER_WIDE_INT
;
5196 this_time
= end
- shift
+ 1;
5199 /* Now get the bits from the appropriate constant word. */
5200 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5201 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5203 /* Get the result. This works only when:
5204 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5205 local
->byte
|= (((value
>> shift
)
5206 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5207 << (BITS_PER_UNIT
- this_time
- next_bit
));
5211 /* On little-endian machines, take the least significant bits of
5212 the value first and pack them starting at the least significant
5213 bits of the bytes. */
5214 shift
= next_offset
- byte_relative_ebitpos
;
5216 /* Don't try to take a bunch of bits that cross
5217 the word boundary in the INTEGER_CST. We can
5218 only select bits from one element. */
5219 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5220 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5222 = HOST_BITS_PER_WIDE_INT
- (shift
& (HOST_BITS_PER_WIDE_INT
- 1));
5224 /* Now get the bits from the appropriate constant word. */
5225 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5226 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5228 /* Get the result. This works only when:
5229 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5230 local
->byte
|= (((value
>> shift
)
5231 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5235 next_offset
+= this_time
;
5236 local
->byte_buffer_in_use
= true;
5240 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5241 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5242 caller output state of relevance in recursive invocations. */
5244 static unsigned HOST_WIDE_INT
5245 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
,
5246 bool reverse
, oc_outer_state
*outer
)
5248 unsigned HOST_WIDE_INT cnt
;
5249 constructor_elt
*ce
;
5250 oc_local_state local
;
5252 /* Setup our local state to communicate with helpers. */
5254 local
.type
= TREE_TYPE (exp
);
5256 local
.align
= align
;
5257 if (TREE_CODE (local
.type
) == ARRAY_TYPE
&& TYPE_DOMAIN (local
.type
))
5258 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5260 local
.min_index
= integer_zero_node
;
5262 local
.total_bytes
= 0;
5263 local
.byte_buffer_in_use
= outer
!= NULL
;
5264 local
.byte
= outer
? outer
->byte
: 0;
5265 local
.last_relative_index
= -1;
5266 /* The storage order is specified for every aggregate type. */
5267 if (AGGREGATE_TYPE_P (local
.type
))
5268 local
.reverse
= TYPE_REVERSE_STORAGE_ORDER (local
.type
);
5270 local
.reverse
= reverse
;
5272 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5274 /* As CE goes through the elements of the constant, FIELD goes through the
5275 structure fields if the constant is a structure. If the constant is a
5276 union, we override this by getting the field from the TREE_LIST element.
5277 But the constant could also be an array. Then FIELD is zero.
5279 There is always a maximum of one element in the chain LINK for unions
5280 (even if the initializer in a source program incorrectly contains
5283 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5284 local
.field
= TYPE_FIELDS (local
.type
);
5286 local
.field
= NULL_TREE
;
5289 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5290 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5292 local
.val
= ce
->value
;
5293 local
.index
= NULL_TREE
;
5295 /* The element in a union constructor specifies the proper field
5297 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5298 local
.field
= ce
->index
;
5300 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5301 local
.index
= ce
->index
;
5303 if (local
.field
&& flag_verbose_asm
)
5304 fprintf (asm_out_file
, "%s %s:\n",
5306 DECL_NAME (local
.field
)
5307 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5310 /* Eliminate the marker that makes a cast not be an lvalue. */
5311 if (local
.val
!= NULL_TREE
)
5312 STRIP_NOPS (local
.val
);
5314 /* Output the current element, using the appropriate helper ... */
5316 /* For an array slice not part of an outer bitfield. */
5318 && local
.index
!= NULL_TREE
5319 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5320 output_constructor_array_range (&local
);
5322 /* For a field that is neither a true bitfield nor part of an outer one,
5323 known to be at least byte aligned and multiple-of-bytes long. */
5325 && (local
.field
== NULL_TREE
5326 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5327 output_constructor_regular_field (&local
);
5329 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5330 supported for scalar fields, so we may need to convert first. */
5333 if (TREE_CODE (local
.val
) == REAL_CST
)
5335 = fold_unary (VIEW_CONVERT_EXPR
,
5336 build_nonstandard_integer_type
5337 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5339 output_constructor_bitfield (&local
, outer
? outer
->bit_offset
: 0);
5343 /* If we are not at toplevel, save the pending data for our caller.
5344 Otherwise output the pending data and padding zeros as needed. */
5346 outer
->byte
= local
.byte
;
5349 if (local
.byte_buffer_in_use
)
5351 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5352 local
.total_bytes
++;
5355 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5357 assemble_zeros (local
.size
- local
.total_bytes
);
5358 local
.total_bytes
= local
.size
;
5362 return local
.total_bytes
;
5365 /* Mark DECL as weak. */
5368 mark_weak (tree decl
)
5370 if (DECL_WEAK (decl
))
5373 struct symtab_node
*n
= symtab_node::get (decl
);
5374 if (n
&& n
->refuse_visibility_changes
)
5375 error ("%+D declared weak after being used", decl
);
5376 DECL_WEAK (decl
) = 1;
5378 if (DECL_RTL_SET_P (decl
)
5379 && MEM_P (DECL_RTL (decl
))
5380 && XEXP (DECL_RTL (decl
), 0)
5381 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5382 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5385 /* Merge weak status between NEWDECL and OLDDECL. */
5388 merge_weak (tree newdecl
, tree olddecl
)
5390 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5392 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5395 /* We put the NEWDECL on the weak_decls list at some point
5396 and OLDDECL as well. Keep just OLDDECL on the list. */
5397 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5398 if (TREE_VALUE (*pwd
) == newdecl
)
5400 *pwd
= TREE_CHAIN (*pwd
);
5407 if (DECL_WEAK (newdecl
))
5411 /* NEWDECL is weak, but OLDDECL is not. */
5413 /* If we already output the OLDDECL, we're in trouble; we can't
5414 go back and make it weak. This should never happen in
5415 unit-at-a-time compilation. */
5416 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5418 /* If we've already generated rtl referencing OLDDECL, we may
5419 have done so in a way that will not function properly with
5420 a weak symbol. Again in unit-at-a-time this should be
5422 gcc_assert (!TREE_USED (olddecl
)
5423 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5425 /* PR 49899: You cannot convert a static function into a weak, public function. */
5426 if (! TREE_PUBLIC (olddecl
) && TREE_PUBLIC (newdecl
))
5427 error ("weak declaration of %q+D being applied to a already "
5428 "existing, static definition", newdecl
);
5430 if (TARGET_SUPPORTS_WEAK
)
5432 /* We put the NEWDECL on the weak_decls list at some point.
5433 Replace it with the OLDDECL. */
5434 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5435 if (TREE_VALUE (wd
) == newdecl
)
5437 TREE_VALUE (wd
) = olddecl
;
5440 /* We may not find the entry on the list. If NEWDECL is a
5441 weak alias, then we will have already called
5442 globalize_decl to remove the entry; in that case, we do
5443 not need to do anything. */
5446 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5447 mark_weak (olddecl
);
5450 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5451 weak. Just update NEWDECL to indicate that it's weak too. */
5452 mark_weak (newdecl
);
5455 /* Declare DECL to be a weak symbol. */
5458 declare_weak (tree decl
)
5460 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5461 if (! TREE_PUBLIC (decl
))
5463 error ("weak declaration of %q+D must be public", decl
);
5466 else if (!TARGET_SUPPORTS_WEAK
)
5467 warning (0, "weak declaration of %q+D not supported", decl
);
5470 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5471 DECL_ATTRIBUTES (decl
)
5472 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5476 weak_finish_1 (tree decl
)
5478 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5479 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5482 if (! TREE_USED (decl
))
5485 #ifdef ASM_WEAKEN_DECL
5486 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5488 #ifdef ASM_WEAKEN_LABEL
5489 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5491 #ifdef ASM_OUTPUT_WEAK_ALIAS
5493 static bool warn_once
= 0;
5496 warning (0, "only weak aliases are supported in this configuration");
5506 /* Fiven an assembly name, find the decl it is associated with. */
5508 find_decl (tree target
)
5510 symtab_node
*node
= symtab_node::get_for_asmname (target
);
5516 /* This TREE_LIST contains weakref targets. */
5518 static GTY(()) tree weakref_targets
;
5520 /* Emit any pending weak declarations. */
5527 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5529 tree alias_decl
= TREE_PURPOSE (t
);
5530 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5532 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5533 /* Remove alias_decl from the weak list, but leave entries for
5534 the target alone. */
5536 #ifndef ASM_OUTPUT_WEAKREF
5537 else if (! TREE_SYMBOL_REFERENCED (target
))
5539 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5540 defined, otherwise we and weak_finish_1 would use
5541 different macros. */
5542 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5543 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5545 tree decl
= find_decl (target
);
5549 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5550 TREE_CODE (alias_decl
), target
,
5551 TREE_TYPE (alias_decl
));
5553 DECL_EXTERNAL (decl
) = 1;
5554 TREE_PUBLIC (decl
) = 1;
5555 DECL_ARTIFICIAL (decl
) = 1;
5556 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5557 TREE_USED (decl
) = 1;
5560 weak_finish_1 (decl
);
5569 /* Remove the alias and the target from the pending weak list
5570 so that we do not emit any .weak directives for the former,
5571 nor multiple .weak directives for the latter. */
5572 for (p
= &weak_decls
; (t2
= *p
) ; )
5574 if (TREE_VALUE (t2
) == alias_decl
5575 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5576 *p
= TREE_CHAIN (t2
);
5578 p
= &TREE_CHAIN (t2
);
5581 /* Remove other weakrefs to the same target, to speed things up. */
5582 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5584 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5585 *p
= TREE_CHAIN (t2
);
5587 p
= &TREE_CHAIN (t2
);
5592 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5594 tree decl
= TREE_VALUE (t
);
5596 weak_finish_1 (decl
);
5600 /* Emit the assembly bits to indicate that DECL is globally visible. */
5603 globalize_decl (tree decl
)
5606 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5607 if (DECL_WEAK (decl
))
5609 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5612 #ifdef ASM_WEAKEN_DECL
5613 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5615 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5618 /* Remove this function from the pending weak list so that
5619 we do not emit multiple .weak directives for it. */
5620 for (p
= &weak_decls
; (t
= *p
) ; )
5622 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5623 *p
= TREE_CHAIN (t
);
5625 p
= &TREE_CHAIN (t
);
5628 /* Remove weakrefs to the same target from the pending weakref
5629 list, for the same reason. */
5630 for (p
= &weakref_targets
; (t
= *p
) ; )
5632 if (DECL_ASSEMBLER_NAME (decl
)
5633 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5634 *p
= TREE_CHAIN (t
);
5636 p
= &TREE_CHAIN (t
);
5643 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5646 vec
<alias_pair
, va_gc
> *alias_pairs
;
5648 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5649 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5650 tree node is DECL to have the value of the tree node TARGET. */
5653 do_assemble_alias (tree decl
, tree target
)
5657 /* Emulated TLS had better not get this var. */
5658 gcc_assert (!(!targetm
.have_tls
5660 && DECL_THREAD_LOCAL_P (decl
)));
5662 if (TREE_ASM_WRITTEN (decl
))
5665 id
= DECL_ASSEMBLER_NAME (decl
);
5666 ultimate_transparent_alias_target (&id
);
5667 ultimate_transparent_alias_target (&target
);
5669 /* We must force creation of DECL_RTL for debug info generation, even though
5670 we don't use it here. */
5671 make_decl_rtl (decl
);
5673 TREE_ASM_WRITTEN (decl
) = 1;
5674 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5675 TREE_ASM_WRITTEN (id
) = 1;
5677 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5679 if (!TREE_SYMBOL_REFERENCED (target
))
5680 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5682 #ifdef ASM_OUTPUT_WEAKREF
5683 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5684 IDENTIFIER_POINTER (id
),
5685 IDENTIFIER_POINTER (target
));
5687 if (!TARGET_SUPPORTS_WEAK
)
5689 error_at (DECL_SOURCE_LOCATION (decl
),
5690 "weakref is not supported in this configuration");
5697 #ifdef ASM_OUTPUT_DEF
5698 tree orig_decl
= decl
;
5700 if (TREE_CODE (decl
) == FUNCTION_DECL
5701 && cgraph_node::get (decl
)->instrumentation_clone
5702 && cgraph_node::get (decl
)->instrumented_version
)
5703 orig_decl
= cgraph_node::get (decl
)->instrumented_version
->decl
;
5705 /* Make name accessible from other files, if appropriate. */
5707 if (TREE_PUBLIC (decl
) || TREE_PUBLIC (orig_decl
))
5709 globalize_decl (decl
);
5710 maybe_assemble_visibility (decl
);
5712 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5714 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5715 if (targetm
.has_ifunc_p ())
5716 ASM_OUTPUT_TYPE_DIRECTIVE
5717 (asm_out_file
, IDENTIFIER_POINTER (id
),
5721 error_at (DECL_SOURCE_LOCATION (decl
),
5722 "ifunc is not supported on this target");
5725 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5726 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5728 ASM_OUTPUT_DEF (asm_out_file
,
5729 IDENTIFIER_POINTER (id
),
5730 IDENTIFIER_POINTER (target
));
5732 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5737 name
= IDENTIFIER_POINTER (id
);
5738 # ifdef ASM_WEAKEN_DECL
5739 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5741 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5743 /* Remove this function from the pending weak list so that
5744 we do not emit multiple .weak directives for it. */
5745 for (p
= &weak_decls
; (t
= *p
) ; )
5746 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
))
5747 || id
== DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5748 *p
= TREE_CHAIN (t
);
5750 p
= &TREE_CHAIN (t
);
5752 /* Remove weakrefs to the same target from the pending weakref
5753 list, for the same reason. */
5754 for (p
= &weakref_targets
; (t
= *p
) ; )
5756 if (id
== ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5757 *p
= TREE_CHAIN (t
);
5759 p
= &TREE_CHAIN (t
);
5765 /* Emit an assembler directive to make the symbol for DECL an alias to
5766 the symbol for TARGET. */
5769 assemble_alias (tree decl
, tree target
)
5773 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5775 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5777 ultimate_transparent_alias_target (&target
);
5779 if (alias
== target
)
5780 error ("weakref %q+D ultimately targets itself", decl
);
5781 if (TREE_PUBLIC (decl
))
5782 error ("weakref %q+D must have static linkage", decl
);
5786 #if !defined (ASM_OUTPUT_DEF)
5787 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5788 error_at (DECL_SOURCE_LOCATION (decl
),
5789 "alias definitions not supported in this configuration");
5790 TREE_ASM_WRITTEN (decl
) = 1;
5793 if (!DECL_WEAK (decl
))
5795 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5796 error_at (DECL_SOURCE_LOCATION (decl
),
5797 "ifunc is not supported in this configuration");
5799 error_at (DECL_SOURCE_LOCATION (decl
),
5800 "only weak aliases are supported in this configuration");
5801 TREE_ASM_WRITTEN (decl
) = 1;
5807 TREE_USED (decl
) = 1;
5809 /* Allow aliases to aliases. */
5810 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5811 cgraph_node::get_create (decl
)->alias
= true;
5813 varpool_node::get_create (decl
)->alias
= true;
5815 /* If the target has already been emitted, we don't have to queue the
5816 alias. This saves a tad of memory. */
5817 if (symtab
->global_info_ready
)
5818 target_decl
= find_decl (target
);
5821 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5822 || symtab
->state
>= EXPANSION
)
5823 do_assemble_alias (decl
, target
);
5826 alias_pair p
= {decl
, target
};
5827 vec_safe_push (alias_pairs
, p
);
5831 /* Record and output a table of translations from original function
5832 to its transaction aware clone. Note that tm_pure functions are
5833 considered to be their own clone. */
5835 struct tm_clone_hasher
: ggc_cache_ptr_hash
<tree_map
>
5837 static hashval_t
hash (tree_map
*m
) { return tree_map_hash (m
); }
5838 static bool equal (tree_map
*a
, tree_map
*b
) { return tree_map_eq (a
, b
); }
5841 keep_cache_entry (tree_map
*&e
)
5843 return ggc_marked_p (e
->base
.from
);
5847 static GTY((cache
)) hash_table
<tm_clone_hasher
> *tm_clone_hash
;
5850 record_tm_clone_pair (tree o
, tree n
)
5852 struct tree_map
**slot
, *h
;
5854 if (tm_clone_hash
== NULL
)
5855 tm_clone_hash
= hash_table
<tm_clone_hasher
>::create_ggc (32);
5857 h
= ggc_alloc
<tree_map
> ();
5858 h
->hash
= htab_hash_pointer (o
);
5862 slot
= tm_clone_hash
->find_slot_with_hash (h
, h
->hash
, INSERT
);
5867 get_tm_clone_pair (tree o
)
5871 struct tree_map
*h
, in
;
5874 in
.hash
= htab_hash_pointer (o
);
5875 h
= tm_clone_hash
->find_with_hash (&in
, in
.hash
);
5882 struct tm_alias_pair
5890 /* Dump the actual pairs to the .tm_clone_table section. */
5893 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5897 bool switched
= false;
5899 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5903 struct cgraph_node
*src_n
= cgraph_node::get (src
);
5904 struct cgraph_node
*dst_n
= cgraph_node::get (dst
);
5906 /* The function ipa_tm_create_version() marks the clone as needed if
5907 the original function was needed. But we also mark the clone as
5908 needed if we ever called the clone indirectly through
5909 TM_GETTMCLONE. If neither of these are true, we didn't generate
5910 a clone, and we didn't call it indirectly... no sense keeping it
5911 in the clone table. */
5912 if (!dst_n
|| !dst_n
->definition
)
5915 /* This covers the case where we have optimized the original
5916 function away, and only access the transactional clone. */
5917 if (!src_n
|| !src_n
->definition
)
5922 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5923 assemble_align (POINTER_SIZE
);
5927 assemble_integer (XEXP (DECL_RTL (src
), 0),
5928 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
5929 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5930 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
5934 /* Provide a default for the tm_clone_table section. */
5937 default_clone_table_section (void)
5939 return get_named_section (NULL
, ".tm_clone_table", 3);
5942 /* Helper comparison function for qsorting by the DECL_UID stored in
5943 alias_pair->emitted_diags. */
5946 tm_alias_pair_cmp (const void *x
, const void *y
)
5948 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5949 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5950 if (p1
->uid
< p2
->uid
)
5952 if (p1
->uid
> p2
->uid
)
5958 finish_tm_clone_pairs (void)
5960 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5962 if (tm_clone_hash
== NULL
)
5965 /* We need a determenistic order for the .tm_clone_table, otherwise
5966 we will get bootstrap comparison failures, so dump the hash table
5967 to a vector, sort it, and dump the vector. */
5969 /* Dump the hashtable to a vector. */
5971 hash_table
<tm_clone_hasher
>::iterator iter
;
5972 FOR_EACH_HASH_TABLE_ELEMENT (*tm_clone_hash
, map
, tree_map
*, iter
)
5974 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5975 tm_alias_pairs
.safe_push (p
);
5978 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5981 dump_tm_clone_pairs (tm_alias_pairs
);
5983 tm_clone_hash
->empty ();
5984 tm_clone_hash
= NULL
;
5985 tm_alias_pairs
.release ();
5989 /* Emit an assembler directive to set symbol for DECL visibility to
5990 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5993 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5994 int vis ATTRIBUTE_UNUSED
)
5996 #ifdef HAVE_GAS_HIDDEN
5997 static const char * const visibility_types
[] = {
5998 NULL
, "protected", "hidden", "internal"
6001 const char *name
, *type
;
6004 id
= DECL_ASSEMBLER_NAME (decl
);
6005 ultimate_transparent_alias_target (&id
);
6006 name
= IDENTIFIER_POINTER (id
);
6008 type
= visibility_types
[vis
];
6010 fprintf (asm_out_file
, "\t.%s\t", type
);
6011 assemble_name (asm_out_file
, name
);
6012 fprintf (asm_out_file
, "\n");
6014 if (!DECL_ARTIFICIAL (decl
))
6015 warning (OPT_Wattributes
, "visibility attribute not supported "
6016 "in this configuration; ignored");
6020 /* A helper function to call assemble_visibility when needed for a decl. */
6023 maybe_assemble_visibility (tree decl
)
6025 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
6027 if (TREE_CODE (decl
) == FUNCTION_DECL
6028 && cgraph_node::get (decl
)
6029 && cgraph_node::get (decl
)->instrumentation_clone
6030 && cgraph_node::get (decl
)->instrumented_version
)
6031 vis
= DECL_VISIBILITY (cgraph_node::get (decl
)->instrumented_version
->decl
);
6033 if (vis
!= VISIBILITY_DEFAULT
)
6035 targetm
.asm_out
.assemble_visibility (decl
, vis
);
6042 /* Returns 1 if the target configuration supports defining public symbols
6043 so that one of them will be chosen at link time instead of generating a
6044 multiply-defined symbol error, whether through the use of weak symbols or
6045 a target-specific mechanism for having duplicates discarded. */
6048 supports_one_only (void)
6050 if (SUPPORTS_ONE_ONLY
)
6052 return TARGET_SUPPORTS_WEAK
;
6055 /* Set up DECL as a public symbol that can be defined in multiple
6056 translation units without generating a linker error. */
6059 make_decl_one_only (tree decl
, tree comdat_group
)
6061 struct symtab_node
*symbol
;
6062 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
6064 TREE_PUBLIC (decl
) = 1;
6067 symbol
= varpool_node::get_create (decl
);
6069 symbol
= cgraph_node::get_create (decl
);
6071 if (SUPPORTS_ONE_ONLY
)
6073 #ifdef MAKE_DECL_ONE_ONLY
6074 MAKE_DECL_ONE_ONLY (decl
);
6076 symbol
->set_comdat_group (comdat_group
);
6078 else if (VAR_P (decl
)
6079 && (DECL_INITIAL (decl
) == 0
6080 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6081 DECL_COMMON (decl
) = 1;
6084 gcc_assert (TARGET_SUPPORTS_WEAK
);
6085 DECL_WEAK (decl
) = 1;
6090 init_varasm_once (void)
6092 section_htab
= hash_table
<section_hasher
>::create_ggc (31);
6093 object_block_htab
= hash_table
<object_block_hasher
>::create_ggc (31);
6094 const_desc_htab
= hash_table
<tree_descriptor_hasher
>::create_ggc (1009);
6096 shared_constant_pool
= create_constant_pool ();
6098 #ifdef TEXT_SECTION_ASM_OP
6099 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
6100 TEXT_SECTION_ASM_OP
);
6103 #ifdef DATA_SECTION_ASM_OP
6104 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6105 DATA_SECTION_ASM_OP
);
6108 #ifdef SDATA_SECTION_ASM_OP
6109 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6110 SDATA_SECTION_ASM_OP
);
6113 #ifdef READONLY_DATA_SECTION_ASM_OP
6114 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
6115 READONLY_DATA_SECTION_ASM_OP
);
6118 #ifdef CTORS_SECTION_ASM_OP
6119 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
6120 CTORS_SECTION_ASM_OP
);
6123 #ifdef DTORS_SECTION_ASM_OP
6124 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
6125 DTORS_SECTION_ASM_OP
);
6128 #ifdef BSS_SECTION_ASM_OP
6129 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6130 output_section_asm_op
,
6131 BSS_SECTION_ASM_OP
);
6134 #ifdef SBSS_SECTION_ASM_OP
6135 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6136 output_section_asm_op
,
6137 SBSS_SECTION_ASM_OP
);
6140 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6141 | SECTION_COMMON
, emit_tls_common
);
6142 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6143 | SECTION_COMMON
, emit_local
);
6144 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6145 | SECTION_COMMON
, emit_common
);
6147 #if defined ASM_OUTPUT_ALIGNED_BSS
6148 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
6152 targetm
.asm_out
.init_sections ();
6154 if (readonly_data_section
== NULL
)
6155 readonly_data_section
= text_section
;
6157 #ifdef ASM_OUTPUT_EXTERNAL
6158 pending_assemble_externals_set
= new hash_set
<tree
>;
6163 decl_default_tls_model (const_tree decl
)
6165 enum tls_model kind
;
6168 is_local
= targetm
.binds_local_p (decl
);
6172 kind
= TLS_MODEL_LOCAL_EXEC
;
6174 kind
= TLS_MODEL_INITIAL_EXEC
;
6177 /* Local dynamic is inefficient when we're not combining the
6178 parts of the address. */
6179 else if (optimize
&& is_local
)
6180 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
6182 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
6183 if (kind
< flag_tls_default
)
6184 kind
= flag_tls_default
;
6189 /* Select a set of attributes for section NAME based on the properties
6190 of DECL and whether or not RELOC indicates that DECL's initializer
6191 might contain runtime relocations.
6193 We make the section read-only and executable for a function decl,
6194 read-only for a const data decl, and writable for a non-const data decl. */
6197 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6201 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6202 flags
= SECTION_CODE
;
6205 enum section_category category
6206 = categorize_decl_for_section (decl
, reloc
);
6207 if (decl_readonly_section_1 (category
))
6209 else if (category
== SECCAT_DATA_REL_RO
6210 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6211 flags
= SECTION_WRITE
| SECTION_RELRO
;
6213 flags
= SECTION_WRITE
;
6217 flags
= SECTION_WRITE
;
6218 if (strcmp (name
, ".data.rel.ro") == 0
6219 || strcmp (name
, ".data.rel.ro.local") == 0)
6220 flags
|= SECTION_RELRO
;
6223 if (decl
&& DECL_P (decl
) && DECL_COMDAT_GROUP (decl
))
6224 flags
|= SECTION_LINKONCE
;
6226 if (strcmp (name
, ".vtable_map_vars") == 0)
6227 flags
|= SECTION_LINKONCE
;
6229 if (decl
&& VAR_P (decl
) && DECL_THREAD_LOCAL_P (decl
))
6230 flags
|= SECTION_TLS
| SECTION_WRITE
;
6232 if (strcmp (name
, ".bss") == 0
6233 || strncmp (name
, ".bss.", 5) == 0
6234 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6235 || strcmp (name
, ".persistent.bss") == 0
6236 || strcmp (name
, ".sbss") == 0
6237 || strncmp (name
, ".sbss.", 6) == 0
6238 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6239 flags
|= SECTION_BSS
;
6241 if (strcmp (name
, ".tdata") == 0
6242 || strncmp (name
, ".tdata.", 7) == 0
6243 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6244 flags
|= SECTION_TLS
;
6246 if (strcmp (name
, ".tbss") == 0
6247 || strncmp (name
, ".tbss.", 6) == 0
6248 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6249 flags
|= SECTION_TLS
| SECTION_BSS
;
6251 /* These three sections have special ELF types. They are neither
6252 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6253 want to print a section type (@progbits or @nobits). If someone
6254 is silly enough to emit code or TLS variables to one of these
6255 sections, then don't handle them specially. */
6256 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6257 && (strcmp (name
, ".init_array") == 0
6258 || strcmp (name
, ".fini_array") == 0
6259 || strcmp (name
, ".preinit_array") == 0))
6260 flags
|= SECTION_NOTYPE
;
6265 /* Return true if the target supports some form of global BSS,
6266 either through bss_noswitch_section, or by selecting a BSS
6267 section in TARGET_ASM_SELECT_SECTION. */
6270 have_global_bss_p (void)
6272 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6275 /* Output assembly to switch to section NAME with attribute FLAGS.
6276 Four variants for common object file formats. */
6279 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6280 unsigned int flags ATTRIBUTE_UNUSED
,
6281 tree decl ATTRIBUTE_UNUSED
)
6283 /* Some object formats don't support named sections at all. The
6284 front-end should already have flagged this as an error. */
6288 #ifndef TLS_SECTION_ASM_FLAG
6289 #define TLS_SECTION_ASM_FLAG 'T'
6293 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6296 char flagchars
[11], *f
= flagchars
;
6297 unsigned int numeric_value
= 0;
6299 /* If we have already declared this section, we can use an
6300 abbreviated form to switch back to it -- unless this section is
6301 part of a COMDAT groups, in which case GAS requires the full
6302 declaration every time. */
6303 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6304 && (flags
& SECTION_DECLARED
))
6306 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6310 /* If we have a machine specific flag, then use the numeric value to pass
6312 if (targetm
.asm_out
.elf_flags_numeric (flags
, &numeric_value
))
6313 snprintf (f
, sizeof (flagchars
), "0x%08x", numeric_value
);
6316 if (!(flags
& SECTION_DEBUG
))
6318 #if defined (HAVE_GAS_SECTION_EXCLUDE) && HAVE_GAS_SECTION_EXCLUDE == 1
6319 if (flags
& SECTION_EXCLUDE
)
6322 if (flags
& SECTION_WRITE
)
6324 if (flags
& SECTION_CODE
)
6326 if (flags
& SECTION_SMALL
)
6328 if (flags
& SECTION_MERGE
)
6330 if (flags
& SECTION_STRINGS
)
6332 if (flags
& SECTION_TLS
)
6333 *f
++ = TLS_SECTION_ASM_FLAG
;
6334 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6336 #ifdef MACH_DEP_SECTION_ASM_FLAG
6337 if (flags
& SECTION_MACH_DEP
)
6338 *f
++ = MACH_DEP_SECTION_ASM_FLAG
;
6343 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6345 if (!(flags
& SECTION_NOTYPE
))
6350 if (flags
& SECTION_BSS
)
6356 /* On platforms that use "@" as the assembly comment character,
6358 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6360 fprintf (asm_out_file
, format
, type
);
6362 if (flags
& SECTION_ENTSIZE
)
6363 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6364 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6366 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6367 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6369 fprintf (asm_out_file
, ",%s,comdat",
6370 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6374 putc ('\n', asm_out_file
);
6378 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6379 tree decl ATTRIBUTE_UNUSED
)
6381 char flagchars
[8], *f
= flagchars
;
6383 if (flags
& SECTION_WRITE
)
6385 if (flags
& SECTION_CODE
)
6389 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6393 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6396 default_coff_asm_named_section (name
, flags
, decl
);
6398 if (flags
& SECTION_LINKONCE
)
6400 /* Functions may have been compiled at various levels of
6401 optimization so we can't use `same_size' here.
6402 Instead, have the linker pick one. */
6403 fprintf (asm_out_file
, "\t.linkonce %s\n",
6404 (flags
& SECTION_CODE
? "discard" : "same_size"));
6408 /* The lame default section selector. */
6411 default_select_section (tree decl
, int reloc
,
6412 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6416 if (decl_readonly_section (decl
, reloc
))
6417 return readonly_data_section
;
6419 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6421 if (! ((flag_pic
&& reloc
)
6422 || !TREE_READONLY (decl
)
6423 || TREE_SIDE_EFFECTS (decl
)
6424 || !TREE_CONSTANT (decl
)))
6425 return readonly_data_section
;
6427 else if (TREE_CODE (decl
) == STRING_CST
)
6428 return readonly_data_section
;
6429 else if (! (flag_pic
&& reloc
))
6430 return readonly_data_section
;
6432 return data_section
;
6435 enum section_category
6436 categorize_decl_for_section (const_tree decl
, int reloc
)
6438 enum section_category ret
;
6440 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6442 else if (TREE_CODE (decl
) == STRING_CST
)
6444 if ((flag_sanitize
& SANITIZE_ADDRESS
)
6445 && asan_protect_global (CONST_CAST_TREE (decl
)))
6446 /* or !flag_merge_constants */
6447 return SECCAT_RODATA
;
6449 return SECCAT_RODATA_MERGE_STR
;
6451 else if (VAR_P (decl
))
6453 if (bss_initializer_p (decl
))
6455 else if (! TREE_READONLY (decl
)
6456 || TREE_SIDE_EFFECTS (decl
)
6457 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6459 /* Here the reloc_rw_mask is not testing whether the section should
6460 be read-only or not, but whether the dynamic link will have to
6461 do something. If so, we wish to segregate the data in order to
6462 minimize cache misses inside the dynamic linker. */
6463 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6464 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6468 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6469 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6470 else if (reloc
|| flag_merge_constants
< 2
6471 || ((flag_sanitize
& SANITIZE_ADDRESS
)
6472 && asan_protect_global (CONST_CAST_TREE (decl
))))
6473 /* C and C++ don't allow different variables to share the same
6474 location. -fmerge-all-constants allows even that (at the
6475 expense of not conforming). */
6476 ret
= SECCAT_RODATA
;
6477 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6478 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6480 ret
= SECCAT_RODATA_MERGE_CONST
;
6482 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6484 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6485 || TREE_SIDE_EFFECTS (decl
)
6486 || ! TREE_CONSTANT (decl
))
6489 ret
= SECCAT_RODATA
;
6492 ret
= SECCAT_RODATA
;
6494 /* There are no read-only thread-local sections. */
6495 if (VAR_P (decl
) && DECL_THREAD_LOCAL_P (decl
))
6497 /* Note that this would be *just* SECCAT_BSS, except that there's
6498 no concept of a read-only thread-local-data section. */
6499 if (ret
== SECCAT_BSS
6500 || (flag_zero_initialized_in_bss
6501 && initializer_zerop (DECL_INITIAL (decl
))))
6507 /* If the target uses small data sections, select it. */
6508 else if (targetm
.in_small_data_p (decl
))
6510 if (ret
== SECCAT_BSS
)
6512 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6513 ret
= SECCAT_SRODATA
;
6522 decl_readonly_section_1 (enum section_category category
)
6527 case SECCAT_RODATA_MERGE_STR
:
6528 case SECCAT_RODATA_MERGE_STR_INIT
:
6529 case SECCAT_RODATA_MERGE_CONST
:
6530 case SECCAT_SRODATA
:
6538 decl_readonly_section (const_tree decl
, int reloc
)
6540 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6543 /* Select a section based on the above categorization. */
6546 default_elf_select_section (tree decl
, int reloc
,
6547 unsigned HOST_WIDE_INT align
)
6550 switch (categorize_decl_for_section (decl
, reloc
))
6553 /* We're not supposed to be called on FUNCTION_DECLs. */
6556 return readonly_data_section
;
6557 case SECCAT_RODATA_MERGE_STR
:
6558 return mergeable_string_section (decl
, align
, 0);
6559 case SECCAT_RODATA_MERGE_STR_INIT
:
6560 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6561 case SECCAT_RODATA_MERGE_CONST
:
6562 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6563 case SECCAT_SRODATA
:
6567 return data_section
;
6568 case SECCAT_DATA_REL
:
6569 sname
= ".data.rel";
6571 case SECCAT_DATA_REL_LOCAL
:
6572 sname
= ".data.rel.local";
6574 case SECCAT_DATA_REL_RO
:
6575 sname
= ".data.rel.ro";
6577 case SECCAT_DATA_REL_RO_LOCAL
:
6578 sname
= ".data.rel.ro.local";
6601 return get_named_section (decl
, sname
, reloc
);
6604 /* Construct a unique section name based on the decl name and the
6605 categorization performed above. */
6608 default_unique_section (tree decl
, int reloc
)
6610 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6611 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6612 const char *prefix
, *name
, *linkonce
;
6616 switch (categorize_decl_for_section (decl
, reloc
))
6619 prefix
= one_only
? ".t" : ".text";
6622 case SECCAT_RODATA_MERGE_STR
:
6623 case SECCAT_RODATA_MERGE_STR_INIT
:
6624 case SECCAT_RODATA_MERGE_CONST
:
6625 prefix
= one_only
? ".r" : ".rodata";
6627 case SECCAT_SRODATA
:
6628 prefix
= one_only
? ".s2" : ".sdata2";
6631 prefix
= one_only
? ".d" : ".data";
6633 case SECCAT_DATA_REL
:
6634 prefix
= one_only
? ".d.rel" : ".data.rel";
6636 case SECCAT_DATA_REL_LOCAL
:
6637 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6639 case SECCAT_DATA_REL_RO
:
6640 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6642 case SECCAT_DATA_REL_RO_LOCAL
:
6643 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6646 prefix
= one_only
? ".s" : ".sdata";
6649 prefix
= one_only
? ".b" : ".bss";
6652 prefix
= one_only
? ".sb" : ".sbss";
6655 prefix
= one_only
? ".td" : ".tdata";
6658 prefix
= one_only
? ".tb" : ".tbss";
6664 id
= DECL_ASSEMBLER_NAME (decl
);
6665 ultimate_transparent_alias_target (&id
);
6666 name
= IDENTIFIER_POINTER (id
);
6667 name
= targetm
.strip_name_encoding (name
);
6669 /* If we're using one_only, then there needs to be a .gnu.linkonce
6670 prefix to the section name. */
6671 linkonce
= one_only
? ".gnu.linkonce" : "";
6673 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6675 set_decl_section_name (decl
, string
);
6678 /* Subroutine of compute_reloc_for_rtx for leaf rtxes. */
6681 compute_reloc_for_rtx_1 (const_rtx x
)
6683 switch (GET_CODE (x
))
6686 return SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6694 /* Like compute_reloc_for_constant, except for an RTX. The return value
6695 is a mask for which bit 1 indicates a global relocation, and bit 0
6696 indicates a local relocation. */
6699 compute_reloc_for_rtx (const_rtx x
)
6701 switch (GET_CODE (x
))
6705 return compute_reloc_for_rtx_1 (x
);
6710 subrtx_iterator::array_type array
;
6711 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
6712 reloc
|= compute_reloc_for_rtx_1 (*iter
);
6722 default_select_rtx_section (machine_mode mode ATTRIBUTE_UNUSED
,
6724 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6726 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6727 return data_section
;
6729 return readonly_data_section
;
6733 default_elf_select_rtx_section (machine_mode mode
, rtx x
,
6734 unsigned HOST_WIDE_INT align
)
6736 int reloc
= compute_reloc_for_rtx (x
);
6738 /* ??? Handle small data here somehow. */
6740 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6743 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6745 return get_named_section (NULL
, ".data.rel.ro", 3);
6748 return mergeable_constant_section (mode
, align
, 0);
6751 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6754 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6759 /* Careful not to prod global register variables. */
6762 symbol
= XEXP (rtl
, 0);
6763 if (GET_CODE (symbol
) != SYMBOL_REF
)
6766 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6767 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6768 flags
|= SYMBOL_FLAG_FUNCTION
;
6769 if (targetm
.binds_local_p (decl
))
6770 flags
|= SYMBOL_FLAG_LOCAL
;
6771 if (VAR_P (decl
) && DECL_THREAD_LOCAL_P (decl
))
6772 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6773 else if (targetm
.in_small_data_p (decl
))
6774 flags
|= SYMBOL_FLAG_SMALL
;
6775 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6776 being PUBLIC, the thing *must* be defined in this translation unit.
6777 Prevent this buglet from being propagated into rtl code as well. */
6778 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6779 flags
|= SYMBOL_FLAG_EXTERNAL
;
6781 SYMBOL_REF_FLAGS (symbol
) = flags
;
6784 /* By default, we do nothing for encode_section_info, so we need not
6785 do anything but discard the '*' marker. */
6788 default_strip_name_encoding (const char *str
)
6790 return str
+ (*str
== '*');
6793 #ifdef ASM_OUTPUT_DEF
6794 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6795 anchor relative to ".", the current section position. */
6798 default_asm_output_anchor (rtx symbol
)
6802 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6803 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6804 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6808 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6811 default_use_anchors_for_symbol_p (const_rtx symbol
)
6816 /* Don't use anchors for mergeable sections. The linker might move
6817 the objects around. */
6818 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6819 if (sect
->common
.flags
& SECTION_MERGE
)
6822 /* Don't use anchors for small data sections. The small data register
6823 acts as an anchor for such sections. */
6824 if (sect
->common
.flags
& SECTION_SMALL
)
6827 decl
= SYMBOL_REF_DECL (symbol
);
6828 if (decl
&& DECL_P (decl
))
6830 /* Don't use section anchors for decls that might be defined or
6831 usurped by other modules. */
6832 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
6835 /* Don't use section anchors for decls that will be placed in a
6836 small data section. */
6837 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6838 one above. The problem is that we only use SECTION_SMALL for
6839 sections that should be marked as small in the section directive. */
6840 if (targetm
.in_small_data_p (decl
))
6843 /* Don't use section anchors for decls that won't fit inside a single
6844 anchor range to reduce the amount of instructions required to refer
6845 to the entire declaration. */
6846 if (DECL_SIZE_UNIT (decl
) == NULL_TREE
6847 || !tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
))
6848 || (tree_to_uhwi (DECL_SIZE_UNIT (decl
))
6849 >= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
))
6856 /* Return true when RESOLUTION indicate that symbol will be bound to the
6857 definition provided by current .o file. */
6860 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6862 return (resolution
== LDPR_PREVAILING_DEF
6863 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6864 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6867 /* Return true when RESOLUTION indicate that symbol will be bound locally
6868 within current executable or DSO. */
6871 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6873 return (resolution
== LDPR_PREVAILING_DEF
6874 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6875 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6876 || resolution
== LDPR_PREEMPTED_REG
6877 || resolution
== LDPR_PREEMPTED_IR
6878 || resolution
== LDPR_RESOLVED_IR
6879 || resolution
== LDPR_RESOLVED_EXEC
);
6882 /* COMMON_LOCAL_P is true means that the linker can guarantee that an
6883 uninitialized common symbol in the executable will still be defined
6884 (through COPY relocation) in the executable. */
6887 default_binds_local_p_3 (const_tree exp
, bool shlib
, bool weak_dominate
,
6888 bool extern_protected_data
, bool common_local_p
)
6890 /* A non-decl is an entry in the constant pool. */
6894 /* Weakrefs may not bind locally, even though the weakref itself is always
6895 static and therefore local. Similarly, the resolver for ifunc functions
6896 might resolve to a non-local function.
6897 FIXME: We can resolve the weakref case more curefuly by looking at the
6899 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6900 || (TREE_CODE (exp
) == FUNCTION_DECL
6901 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6904 /* Static variables are always local. */
6905 if (! TREE_PUBLIC (exp
))
6908 /* With resolution file in hand, take look into resolutions.
6909 We can't just return true for resolved_locally symbols,
6910 because dynamic linking might overwrite symbols
6911 in shared libraries. */
6912 bool resolved_locally
= false;
6914 bool uninited_common
= (DECL_COMMON (exp
)
6915 && (DECL_INITIAL (exp
) == NULL
6917 && DECL_INITIAL (exp
) == error_mark_node
)));
6919 /* A non-external variable is defined locally only if it isn't
6920 uninitialized COMMON variable or common_local_p is true. */
6921 bool defined_locally
= (!DECL_EXTERNAL (exp
)
6922 && (!uninited_common
|| common_local_p
));
6923 if (symtab_node
*node
= symtab_node::get (exp
))
6925 if (node
->in_other_partition
)
6926 defined_locally
= true;
6927 if (node
->can_be_discarded_p ())
6929 else if (resolution_to_local_definition_p (node
->resolution
))
6930 defined_locally
= resolved_locally
= true;
6931 else if (resolution_local_p (node
->resolution
))
6932 resolved_locally
= true;
6934 if (defined_locally
&& weak_dominate
&& !shlib
)
6935 resolved_locally
= true;
6937 /* Undefined weak symbols are never defined locally. */
6938 if (DECL_WEAK (exp
) && !defined_locally
)
6941 /* A symbol is local if the user has said explicitly that it will be,
6942 or if we have a definition for the symbol. We cannot infer visibility
6943 for undefined symbols. */
6944 if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
6945 && (TREE_CODE (exp
) == FUNCTION_DECL
6946 || !extern_protected_data
6947 || DECL_VISIBILITY (exp
) != VISIBILITY_PROTECTED
)
6948 && (DECL_VISIBILITY_SPECIFIED (exp
) || defined_locally
))
6951 /* If PIC, then assume that any global name can be overridden by
6952 symbols resolved from other modules. */
6956 /* Variables defined outside this object might not be local. */
6957 if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6960 /* Non-dominant weak symbols are not defined locally. */
6961 if (DECL_WEAK (exp
) && !resolved_locally
)
6964 /* Uninitialized COMMON variable may be unified with symbols
6965 resolved from other modules. */
6966 if (uninited_common
&& !resolved_locally
)
6969 /* Otherwise we're left with initialized (or non-common) global data
6970 which is of necessity defined locally. */
6974 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6975 wrt cross-module name binding. */
6978 default_binds_local_p (const_tree exp
)
6980 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, false, false);
6983 /* Similar to default_binds_local_p, but common symbol may be local and
6984 extern protected data is non-local. */
6987 default_binds_local_p_2 (const_tree exp
)
6989 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, true,
6994 default_binds_local_p_1 (const_tree exp
, int shlib
)
6996 return default_binds_local_p_3 (exp
, shlib
!= 0, false, false, false);
6999 /* Return true when references to DECL must bind to current definition in
7002 The condition is usually equivalent to whether the function binds to the
7003 current module (shared library or executable), that is to binds_local_p.
7004 We use this fact to avoid need for another target hook and implement
7005 the logic using binds_local_p and just special cases where
7006 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
7007 the weak definitions (that can be overwritten at linktime by other
7008 definition from different object file) and when resolution info is available
7009 we simply use the knowledge passed to us by linker plugin. */
7011 decl_binds_to_current_def_p (const_tree decl
)
7013 gcc_assert (DECL_P (decl
));
7014 if (!targetm
.binds_local_p (decl
))
7016 if (!TREE_PUBLIC (decl
))
7019 /* When resolution is available, just use it. */
7020 if (symtab_node
*node
= symtab_node::get (decl
))
7022 if (node
->resolution
!= LDPR_UNKNOWN
7023 && !node
->can_be_discarded_p ())
7024 return resolution_to_local_definition_p (node
->resolution
);
7027 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
7028 binds locally but still can be overwritten), DECL_COMMON (can be merged
7029 with a non-common definition somewhere in the same module) or
7031 This rely on fact that binds_local_p behave as decl_replaceable_p
7032 for all other declaration types. */
7033 if (DECL_WEAK (decl
))
7035 if (DECL_COMMON (decl
)
7036 && (DECL_INITIAL (decl
) == NULL
7037 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
7039 if (DECL_EXTERNAL (decl
))
7044 /* A replaceable function or variable is one which may be replaced
7045 at link-time with an entirely different definition, provided that the
7046 replacement has the same type. For example, functions declared
7047 with __attribute__((weak)) on most systems are replaceable.
7049 COMDAT functions are not replaceable, since all definitions of the
7050 function must be equivalent. It is important that COMDAT functions
7051 not be treated as replaceable so that use of C++ template
7052 instantiations is not penalized. */
7055 decl_replaceable_p (tree decl
)
7057 gcc_assert (DECL_P (decl
));
7058 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
7060 if (!flag_semantic_interposition
7061 && !DECL_WEAK (decl
))
7063 return !decl_binds_to_current_def_p (decl
);
7066 /* Default function to output code that will globalize a label. A
7067 target must define GLOBAL_ASM_OP or provide its own function to
7068 globalize a label. */
7069 #ifdef GLOBAL_ASM_OP
7071 default_globalize_label (FILE * stream
, const char *name
)
7073 fputs (GLOBAL_ASM_OP
, stream
);
7074 assemble_name (stream
, name
);
7075 putc ('\n', stream
);
7077 #endif /* GLOBAL_ASM_OP */
7079 /* Default function to output code that will globalize a declaration. */
7081 default_globalize_decl_name (FILE * stream
, tree decl
)
7083 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
7084 targetm
.asm_out
.globalize_label (stream
, name
);
7087 /* Default function to output a label for unwind information. The
7088 default is to do nothing. A target that needs nonlocal labels for
7089 unwind information must provide its own function to do this. */
7091 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
7092 tree decl ATTRIBUTE_UNUSED
,
7093 int for_eh ATTRIBUTE_UNUSED
,
7094 int empty ATTRIBUTE_UNUSED
)
7098 /* Default function to output a label to divide up the exception table.
7099 The default is to do nothing. A target that needs/wants to divide
7100 up the table must provide it's own function to do this. */
7102 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
7106 /* This is how to output an internal numbered label where PREFIX is
7107 the class of label and LABELNO is the number within the class. */
7110 default_generate_internal_label (char *buf
, const char *prefix
,
7111 unsigned long labelno
)
7113 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7116 /* This is how to output an internal numbered label where PREFIX is
7117 the class of label and LABELNO is the number within the class. */
7120 default_internal_label (FILE *stream
, const char *prefix
,
7121 unsigned long labelno
)
7123 char *const buf
= (char *) alloca (40 + strlen (prefix
));
7124 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7125 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
7129 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
7132 default_asm_declare_constant_name (FILE *file
, const char *name
,
7133 const_tree exp ATTRIBUTE_UNUSED
,
7134 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
7136 assemble_label (file
, name
);
7139 /* This is the default behavior at the beginning of a file. It's
7140 controlled by two other target-hook toggles. */
7142 default_file_start (void)
7144 if (targetm
.asm_file_start_app_off
7145 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
7146 fputs (ASM_APP_OFF
, asm_out_file
);
7148 if (targetm
.asm_file_start_file_directive
)
7150 /* LTO produced units have no meaningful main_input_filename. */
7152 output_file_directive (asm_out_file
, "<artificial>");
7154 output_file_directive (asm_out_file
, main_input_filename
);
7158 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
7159 which emits a special section directive used to indicate whether or
7160 not this object file needs an executable stack. This is primarily
7161 a GNU extension to ELF but could be used on other targets. */
7163 int trampolines_created
;
7166 file_end_indicate_exec_stack (void)
7168 unsigned int flags
= SECTION_DEBUG
;
7169 if (trampolines_created
)
7170 flags
|= SECTION_CODE
;
7172 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
7175 /* Emit a special section directive to indicate that this object file
7176 was compiled with -fsplit-stack. This is used to let the linker
7177 detect calls between split-stack code and non-split-stack code, so
7178 that it can modify the split-stack code to allocate a sufficiently
7179 large stack. We emit another special section if there are any
7180 functions in this file which have the no_split_stack attribute, to
7181 prevent the linker from warning about being unable to convert the
7182 functions if they call non-split-stack code. */
7185 file_end_indicate_split_stack (void)
7187 if (flag_split_stack
)
7189 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
7191 if (saw_no_split_stack
)
7192 switch_to_section (get_section (".note.GNU-no-split-stack",
7193 SECTION_DEBUG
, NULL
));
7197 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
7198 a get_unnamed_section callback. */
7201 output_section_asm_op (const void *directive
)
7203 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
7206 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
7207 the current section is NEW_SECTION. */
7210 switch_to_section (section
*new_section
)
7212 if (in_section
== new_section
)
7215 if (new_section
->common
.flags
& SECTION_FORGET
)
7218 in_section
= new_section
;
7220 switch (SECTION_STYLE (new_section
))
7223 targetm
.asm_out
.named_section (new_section
->named
.name
,
7224 new_section
->named
.common
.flags
,
7225 new_section
->named
.decl
);
7228 case SECTION_UNNAMED
:
7229 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
7232 case SECTION_NOSWITCH
:
7237 new_section
->common
.flags
|= SECTION_DECLARED
;
7240 /* If block symbol SYMBOL has not yet been assigned an offset, place
7241 it at the end of its block. */
7244 place_block_symbol (rtx symbol
)
7246 unsigned HOST_WIDE_INT size
, mask
, offset
;
7247 struct constant_descriptor_rtx
*desc
;
7248 unsigned int alignment
;
7249 struct object_block
*block
;
7252 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7253 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7256 /* Work out the symbol's size and alignment. */
7257 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7259 desc
= SYMBOL_REF_CONSTANT (symbol
);
7260 alignment
= desc
->align
;
7261 size
= GET_MODE_SIZE (desc
->mode
);
7263 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7265 decl
= SYMBOL_REF_DECL (symbol
);
7266 gcc_checking_assert (DECL_IN_CONSTANT_POOL (decl
));
7267 alignment
= DECL_ALIGN (decl
);
7268 size
= get_constant_size (DECL_INITIAL (decl
));
7269 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7270 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7271 && asan_protect_global (DECL_INITIAL (decl
)))
7273 size
+= asan_red_zone_size (size
);
7274 alignment
= MAX (alignment
,
7275 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7280 struct symtab_node
*snode
;
7281 decl
= SYMBOL_REF_DECL (symbol
);
7283 snode
= symtab_node::get (decl
);
7286 rtx target
= DECL_RTL (snode
->ultimate_alias_target ()->decl
);
7288 gcc_assert (MEM_P (target
)
7289 && GET_CODE (XEXP (target
, 0)) == SYMBOL_REF
7290 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (target
, 0)));
7291 target
= XEXP (target
, 0);
7292 place_block_symbol (target
);
7293 SYMBOL_REF_BLOCK_OFFSET (symbol
) = SYMBOL_REF_BLOCK_OFFSET (target
);
7296 alignment
= get_variable_align (decl
);
7297 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7298 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7299 && asan_protect_global (decl
))
7301 size
+= asan_red_zone_size (size
);
7302 alignment
= MAX (alignment
,
7303 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7307 /* Calculate the object's offset from the start of the block. */
7308 block
= SYMBOL_REF_BLOCK (symbol
);
7309 mask
= alignment
/ BITS_PER_UNIT
- 1;
7310 offset
= (block
->size
+ mask
) & ~mask
;
7311 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7313 /* Record the block's new alignment and size. */
7314 block
->alignment
= MAX (block
->alignment
, alignment
);
7315 block
->size
= offset
+ size
;
7317 vec_safe_push (block
->objects
, symbol
);
7320 /* Return the anchor that should be used to address byte offset OFFSET
7321 from the first object in BLOCK. MODEL is the TLS model used
7325 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7326 enum tls_model model
)
7329 unsigned int begin
, middle
, end
;
7330 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7333 /* Work out the anchor's offset. Use an offset of 0 for the first
7334 anchor so that we don't pessimize the case where we take the address
7335 of a variable at the beginning of the block. This is particularly
7336 useful when a block has only one variable assigned to it.
7338 We try to place anchors RANGE bytes apart, so there can then be
7339 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7340 a ptr_mode offset. With some target settings, the lowest such
7341 anchor might be out of range for the lowest ptr_mode offset;
7342 likewise the highest anchor for the highest offset. Use anchors
7343 at the extreme ends of the ptr_mode range in such cases.
7345 All arithmetic uses unsigned integers in order to avoid
7347 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7348 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7349 range
= max_offset
- min_offset
+ 1;
7354 bias
= HOST_WIDE_INT_1U
<< (GET_MODE_BITSIZE (ptr_mode
) - 1);
7357 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7358 delta
-= delta
% range
;
7361 offset
= (HOST_WIDE_INT
) (-delta
);
7365 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7366 delta
-= delta
% range
;
7367 if (delta
> bias
- 1)
7369 offset
= (HOST_WIDE_INT
) delta
;
7373 /* Do a binary search to see if there's already an anchor we can use.
7374 Set BEGIN to the new anchor's index if not. */
7376 end
= vec_safe_length (block
->anchors
);
7377 while (begin
!= end
)
7379 middle
= (end
+ begin
) / 2;
7380 anchor
= (*block
->anchors
)[middle
];
7381 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7383 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7385 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7387 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7393 /* Create a new anchor with a unique label. */
7394 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7395 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7396 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7397 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7399 /* Insert it at index BEGIN. */
7400 vec_safe_insert (block
->anchors
, begin
, anchor
);
7404 /* Output the objects in BLOCK. */
7407 output_object_block (struct object_block
*block
)
7409 struct constant_descriptor_rtx
*desc
;
7411 HOST_WIDE_INT offset
;
7415 if (!block
->objects
)
7418 /* Switch to the section and make sure that the first byte is
7419 suitably aligned. */
7420 /* Special case VTV comdat sections similar to assemble_variable. */
7421 if (SECTION_STYLE (block
->sect
) == SECTION_NAMED
7422 && block
->sect
->named
.name
7423 && (strcmp (block
->sect
->named
.name
, ".vtable_map_vars") == 0))
7424 handle_vtv_comdat_section (block
->sect
, block
->sect
->named
.decl
);
7426 switch_to_section (block
->sect
);
7428 assemble_align (block
->alignment
);
7430 /* Define the values of all anchors relative to the current section
7432 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7433 targetm
.asm_out
.output_anchor (symbol
);
7435 /* Output the objects themselves. */
7437 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7439 /* Move to the object's offset, padding with zeros if necessary. */
7440 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7441 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7442 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7444 desc
= SYMBOL_REF_CONSTANT (symbol
);
7445 /* Pass 1 for align as we have already laid out everything in the block.
7446 So aligning shouldn't be necessary. */
7447 output_constant_pool_1 (desc
, 1);
7448 offset
+= GET_MODE_SIZE (desc
->mode
);
7450 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7453 decl
= SYMBOL_REF_DECL (symbol
);
7454 assemble_constant_contents
7455 (DECL_INITIAL (decl
), XSTR (symbol
, 0), DECL_ALIGN (decl
));
7457 size
= get_constant_size (DECL_INITIAL (decl
));
7459 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7460 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7461 && asan_protect_global (DECL_INITIAL (decl
)))
7463 size
= asan_red_zone_size (size
);
7464 assemble_zeros (size
);
7471 decl
= SYMBOL_REF_DECL (symbol
);
7472 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7473 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7475 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7476 && asan_protect_global (decl
))
7478 size
= asan_red_zone_size (size
);
7479 assemble_zeros (size
);
7486 /* A callback for qsort to compare object_blocks. */
7489 output_object_block_compare (const void *x
, const void *y
)
7491 object_block
*p1
= *(object_block
* const*)x
;
7492 object_block
*p2
= *(object_block
* const*)y
;
7494 if (p1
->sect
->common
.flags
& SECTION_NAMED
7495 && !(p2
->sect
->common
.flags
& SECTION_NAMED
))
7498 if (!(p1
->sect
->common
.flags
& SECTION_NAMED
)
7499 && p2
->sect
->common
.flags
& SECTION_NAMED
)
7502 if (p1
->sect
->common
.flags
& SECTION_NAMED
7503 && p2
->sect
->common
.flags
& SECTION_NAMED
)
7504 return strcmp (p1
->sect
->named
.name
, p2
->sect
->named
.name
);
7506 unsigned f1
= p1
->sect
->common
.flags
;
7507 unsigned f2
= p2
->sect
->common
.flags
;
7510 return f1
< f2
? -1 : 1;
7513 /* Output the definitions of all object_blocks. */
7516 output_object_blocks (void)
7518 vec
<object_block
*, va_heap
> v
;
7519 v
.create (object_block_htab
->elements ());
7521 hash_table
<object_block_hasher
>::iterator hi
;
7523 FOR_EACH_HASH_TABLE_ELEMENT (*object_block_htab
, obj
, object_block
*, hi
)
7526 /* Sort them in order to output them in a deterministic manner,
7527 otherwise we may get .rodata sections in different orders with
7529 v
.qsort (output_object_block_compare
);
7531 FOR_EACH_VEC_ELT (v
, i
, obj
)
7532 output_object_block (obj
);
7537 /* This function provides a possible implementation of the
7538 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7539 by -frecord-gcc-switches it creates a new mergeable, string section in the
7540 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7541 contains the switches in ASCII format.
7543 FIXME: This code does not correctly handle double quote characters
7544 that appear inside strings, (it strips them rather than preserving them).
7545 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7546 characters - instead it treats them as sub-string separators. Since
7547 we want to emit NUL strings terminators into the object file we have to use
7551 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7555 case SWITCH_TYPE_PASSED
:
7556 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7557 ASM_OUTPUT_SKIP (asm_out_file
, HOST_WIDE_INT_1U
);
7560 case SWITCH_TYPE_DESCRIPTIVE
:
7563 /* Distinguish between invocations where name is NULL. */
7564 static bool started
= false;
7570 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7574 | (SECTION_ENTSIZE
& 1),
7576 switch_to_section (sec
);
7585 /* The return value is currently ignored by the caller, but must be 0.
7586 For -fverbose-asm the return value would be the number of characters
7587 emitted into the assembler file. */
7591 /* Emit text to declare externally defined symbols. It is needed to
7592 properly support non-default visibility. */
7594 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7596 const char *name ATTRIBUTE_UNUSED
)
7598 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7599 set in order to avoid putting out names that are never really
7600 used. Always output visibility specified in the source. */
7601 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7602 && (DECL_VISIBILITY_SPECIFIED (decl
)
7603 || targetm
.binds_local_p (decl
)))
7604 maybe_assemble_visibility (decl
);
7607 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7610 default_asm_output_source_filename (FILE *file
, const char *name
)
7612 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7613 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7615 fprintf (file
, "\t.file\t");
7616 output_quoted_string (file
, name
);
7621 /* Output a file name in the form wanted by System V. */
7624 output_file_directive (FILE *asm_file
, const char *input_name
)
7629 if (input_name
== NULL
)
7630 input_name
= "<stdin>";
7632 input_name
= remap_debug_filename (input_name
);
7634 len
= strlen (input_name
);
7635 na
= input_name
+ len
;
7637 /* NA gets INPUT_NAME sans directory names. */
7638 while (na
> input_name
)
7640 if (IS_DIR_SEPARATOR (na
[-1]))
7645 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7648 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7651 make_debug_expr_from_rtl (const_rtx exp
)
7653 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7654 machine_mode mode
= GET_MODE (exp
);
7657 DECL_ARTIFICIAL (ddecl
) = 1;
7658 if (REG_P (exp
) && REG_EXPR (exp
))
7659 type
= TREE_TYPE (REG_EXPR (exp
));
7660 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7661 type
= TREE_TYPE (MEM_EXPR (exp
));
7664 if (type
&& TYPE_MODE (type
) == mode
)
7665 TREE_TYPE (ddecl
) = type
;
7667 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7668 SET_DECL_MODE (ddecl
, mode
);
7669 dval
= gen_rtx_DEBUG_EXPR (mode
);
7670 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7671 SET_DECL_RTL (ddecl
, dval
);
7675 #ifdef ELF_ASCII_ESCAPES
7676 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7679 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7684 fputs (STRING_ASM_OP
, f
);
7689 escape
= ELF_ASCII_ESCAPES
[c
];
7697 putc ('0'+((c
>>6)&7), f
);
7698 putc ('0'+((c
>>3)&7), f
);
7699 putc ('0'+(c
&7), f
);
7712 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7715 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7717 const char *limit
= s
+ len
;
7718 const char *last_null
= NULL
;
7719 unsigned bytes_in_chunk
= 0;
7723 for (; s
< limit
; s
++)
7727 if (bytes_in_chunk
>= 60)
7736 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7743 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7745 if (bytes_in_chunk
> 0)
7752 default_elf_asm_output_limited_string (f
, s
);
7757 if (bytes_in_chunk
== 0)
7758 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7761 escape
= ELF_ASCII_ESCAPES
[c
];
7770 putc ('0'+((c
>>6)&7), f
);
7771 putc ('0'+((c
>>3)&7), f
);
7772 putc ('0'+(c
&7), f
);
7773 bytes_in_chunk
+= 4;
7778 bytes_in_chunk
+= 2;
7785 if (bytes_in_chunk
> 0)
7793 static GTY(()) section
*elf_init_array_section
;
7794 static GTY(()) section
*elf_fini_array_section
;
7797 get_elf_initfini_array_priority_section (int priority
,
7801 if (priority
!= DEFAULT_INIT_PRIORITY
)
7804 sprintf (buf
, "%s.%.5u",
7805 constructor_p
? ".init_array" : ".fini_array",
7807 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7813 if (elf_init_array_section
== NULL
)
7814 elf_init_array_section
7815 = get_section (".init_array",
7816 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7817 sec
= elf_init_array_section
;
7821 if (elf_fini_array_section
== NULL
)
7822 elf_fini_array_section
7823 = get_section (".fini_array",
7824 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7825 sec
= elf_fini_array_section
;
7831 /* Use .init_array section for constructors. */
7834 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7836 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7838 assemble_addr_to_section (symbol
, sec
);
7841 /* Use .fini_array section for destructors. */
7844 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7846 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7848 assemble_addr_to_section (symbol
, sec
);
7851 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7853 This is a bit of a cheat. The real default is a no-op, but this
7854 hook is the default for all targets with a .ident directive. */
7857 default_asm_output_ident_directive (const char *ident_str
)
7859 const char *ident_asm_op
= "\t.ident\t";
7861 /* If we are still in the front end, do not write out the string
7862 to asm_out_file. Instead, add a fake top-level asm statement.
7863 This allows the front ends to use this hook without actually
7864 writing to asm_out_file, to handle #ident or Pragma Ident. */
7865 if (symtab
->state
== PARSING
)
7867 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7868 symtab
->finalize_toplevel_asm (build_string (strlen (buf
), buf
));
7871 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7875 /* This function ensures that vtable_map variables are not only
7876 in the comdat section, but that each variable has its own unique
7877 comdat name. Without this the variables end up in the same section
7878 with a single comdat name.
7880 FIXME: resolve_unique_section needs to deal better with
7881 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
7882 that is fixed, this if-else statement can be replaced with
7883 a single call to "switch_to_section (sect)". */
7886 handle_vtv_comdat_section (section
*sect
, const_tree decl ATTRIBUTE_UNUSED
)
7888 #if defined (OBJECT_FORMAT_ELF)
7889 targetm
.asm_out
.named_section (sect
->named
.name
,
7890 sect
->named
.common
.flags
7895 /* Neither OBJECT_FORMAT_PE, nor OBJECT_FORMAT_COFF is set here.
7896 Therefore the following check is used.
7897 In case a the target is PE or COFF a comdat group section
7898 is created, e.g. .vtable_map_vars$foo. The linker places
7899 everything in .vtable_map_vars at the end.
7901 A fix could be made in
7902 gcc/config/i386/winnt.c: i386_pe_unique_section. */
7907 if (TREE_CODE (DECL_NAME (decl
)) == IDENTIFIER_NODE
)
7908 name
= ACONCAT ((sect
->named
.name
, "$",
7909 IDENTIFIER_POINTER (DECL_NAME (decl
)), NULL
));
7911 name
= ACONCAT ((sect
->named
.name
, "$",
7912 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (DECL_NAME (decl
))),
7915 targetm
.asm_out
.named_section (name
,
7916 sect
->named
.common
.flags
7922 switch_to_section (sect
);
7926 #include "gt-varasm.h"