1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987-2015 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
21 /* This file handles generation of all the assembler code
22 *except* the instructions of a function.
23 This includes declarations of variables and their initial values.
25 We also output the assembler code for constants stored in memory
26 and are responsible for combining constants with the same value. */
30 #include "coretypes.h"
36 #include "fold-const.h"
37 #include "stor-layout.h"
38 #include "stringpool.h"
41 #include "hard-reg-set.h"
43 #include "insn-config.h"
53 #include "diagnostic-core.h"
54 #include "langhooks.h"
58 #include "common/common-target.h"
59 #include "targhooks.h"
61 #include "dominance.h"
63 #include "basic-block.h"
67 #include "tree-chkp.h"
69 #ifdef XCOFF_DEBUGGING_INFO
70 #include "xcoffout.h" /* Needed for external data
71 declarations for e.g. AIX 4.x. */
74 /* The (assembler) name of the first globally-visible object output. */
75 extern GTY(()) const char *first_global_object_name
;
76 extern GTY(()) const char *weak_global_object_name
;
78 const char *first_global_object_name
;
79 const char *weak_global_object_name
;
82 struct constant_descriptor_rtx
;
83 struct rtx_constant_pool
;
85 #define n_deferred_constants (crtl->varasm.deferred_constants)
87 /* Number for making the label on the next
88 constant that is stored in memory. */
90 static GTY(()) int const_labelno
;
92 /* Carry information from ASM_DECLARE_OBJECT_NAME
93 to ASM_FINISH_DECLARE_OBJECT. */
95 int size_directive_output
;
97 /* The last decl for which assemble_variable was called,
98 if it did ASM_DECLARE_OBJECT_NAME.
99 If the last call to assemble_variable didn't do that,
102 tree last_assemble_variable_decl
;
104 /* The following global variable indicates if the first basic block
105 in a function belongs to the cold partition or not. */
107 bool first_function_block_is_cold
;
109 /* Whether we saw any functions with no_split_stack. */
111 static bool saw_no_split_stack
;
113 static const char *strip_reg_name (const char *);
114 static int contains_pointers_p (tree
);
115 #ifdef ASM_OUTPUT_EXTERNAL
116 static bool incorporeal_function_p (tree
);
118 static void decode_addr_const (tree
, struct addr_const
*);
119 static hashval_t
const_hash_1 (const tree
);
120 static int compare_constant (const tree
, const tree
);
121 static void output_constant_def_contents (rtx
);
122 static void output_addressed_constants (tree
);
123 static unsigned HOST_WIDE_INT
output_constant (tree
, unsigned HOST_WIDE_INT
,
125 static void globalize_decl (tree
);
126 static bool decl_readonly_section_1 (enum section_category
);
127 #ifdef BSS_SECTION_ASM_OP
128 #ifdef ASM_OUTPUT_ALIGNED_BSS
129 static void asm_output_aligned_bss (FILE *, tree
, const char *,
130 unsigned HOST_WIDE_INT
, int)
133 #endif /* BSS_SECTION_ASM_OP */
134 static void mark_weak (tree
);
135 static void output_constant_pool (const char *, tree
);
137 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
138 section
*text_section
;
139 section
*data_section
;
140 section
*readonly_data_section
;
141 section
*sdata_section
;
142 section
*ctors_section
;
143 section
*dtors_section
;
144 section
*bss_section
;
145 section
*sbss_section
;
147 /* Various forms of common section. All are guaranteed to be nonnull. */
148 section
*tls_comm_section
;
149 section
*comm_section
;
150 section
*lcomm_section
;
152 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
154 section
*bss_noswitch_section
;
156 /* The section that holds the main exception table, when known. The section
157 is set either by the target's init_sections hook or by the first call to
158 switch_to_exception_section. */
159 section
*exception_section
;
161 /* The section that holds the DWARF2 frame unwind information, when known.
162 The section is set either by the target's init_sections hook or by the
163 first call to switch_to_eh_frame_section. */
164 section
*eh_frame_section
;
166 /* asm_out_file's current section. This is NULL if no section has yet
167 been selected or if we lose track of what the current section is. */
170 /* True if code for the current function is currently being directed
171 at the cold section. */
172 bool in_cold_section_p
;
174 /* The following global holds the "function name" for the code in the
175 cold section of a function, if hot/cold function splitting is enabled
176 and there was actually code that went into the cold section. A
177 pseudo function name is needed for the cold section of code for some
178 debugging tools that perform symbolization. */
179 tree cold_function_name
= NULL_TREE
;
181 /* A linked list of all the unnamed sections. */
182 static GTY(()) section
*unnamed_sections
;
184 /* Return a nonzero value if DECL has a section attribute. */
185 #define IN_NAMED_SECTION(DECL) \
186 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
187 && DECL_SECTION_NAME (DECL) != NULL)
189 struct section_hasher
: ggc_ptr_hash
<section
>
191 typedef const char *compare_type
;
193 static hashval_t
hash (section
*);
194 static bool equal (section
*, const char *);
197 /* Hash table of named sections. */
198 static GTY(()) hash_table
<section_hasher
> *section_htab
;
200 struct object_block_hasher
: ggc_ptr_hash
<object_block
>
202 typedef const section
*compare_type
;
204 static hashval_t
hash (object_block
*);
205 static bool equal (object_block
*, const section
*);
208 /* A table of object_blocks, indexed by section. */
209 static GTY(()) hash_table
<object_block_hasher
> *object_block_htab
;
211 /* The next number to use for internal anchor labels. */
212 static GTY(()) int anchor_labelno
;
214 /* A pool of constants that can be shared between functions. */
215 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
217 /* Helper routines for maintaining section_htab. */
220 section_hasher::equal (section
*old
, const char *new_name
)
222 return strcmp (old
->named
.name
, new_name
) == 0;
226 section_hasher::hash (section
*old
)
228 return htab_hash_string (old
->named
.name
);
231 /* Return a hash value for section SECT. */
234 hash_section (section
*sect
)
236 if (sect
->common
.flags
& SECTION_NAMED
)
237 return htab_hash_string (sect
->named
.name
);
238 return sect
->common
.flags
;
241 /* Helper routines for maintaining object_block_htab. */
244 object_block_hasher::equal (object_block
*old
, const section
*new_section
)
246 return old
->sect
== new_section
;
250 object_block_hasher::hash (object_block
*old
)
252 return hash_section (old
->sect
);
255 /* Return a new unnamed section with the given fields. */
258 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
263 sect
= ggc_alloc
<section
> ();
264 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
265 sect
->unnamed
.callback
= callback
;
266 sect
->unnamed
.data
= data
;
267 sect
->unnamed
.next
= unnamed_sections
;
269 unnamed_sections
= sect
;
273 /* Return a SECTION_NOSWITCH section with the given fields. */
276 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
280 sect
= ggc_alloc
<section
> ();
281 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
282 sect
->noswitch
.callback
= callback
;
287 /* Return the named section structure associated with NAME. Create
288 a new section with the given fields if no such structure exists. */
291 get_section (const char *name
, unsigned int flags
, tree decl
)
293 section
*sect
, **slot
;
295 slot
= section_htab
->find_slot_with_hash (name
, htab_hash_string (name
),
297 flags
|= SECTION_NAMED
;
300 sect
= ggc_alloc
<section
> ();
301 sect
->named
.common
.flags
= flags
;
302 sect
->named
.name
= ggc_strdup (name
);
303 sect
->named
.decl
= decl
;
309 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
310 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
312 /* It is fine if one of the section flags is
313 SECTION_WRITE | SECTION_RELRO and the other has none of these
314 flags (i.e. read-only) in named sections and either the
315 section hasn't been declared yet or has been declared as writable.
316 In that case just make sure the resulting flags are
317 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
319 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
320 == (SECTION_WRITE
| SECTION_RELRO
)
321 && (sect
->common
.flags
322 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
323 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
324 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
325 || (sect
->common
.flags
& SECTION_WRITE
)))
327 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
330 /* Sanity check user variables for flag changes. */
331 if (sect
->named
.decl
!= NULL
332 && DECL_P (sect
->named
.decl
)
333 && decl
!= sect
->named
.decl
)
335 if (decl
!= NULL
&& DECL_P (decl
))
336 error ("%+D causes a section type conflict with %D",
337 decl
, sect
->named
.decl
);
339 error ("section type conflict with %D", sect
->named
.decl
);
340 inform (DECL_SOURCE_LOCATION (sect
->named
.decl
),
341 "%qD was declared here", sect
->named
.decl
);
343 else if (decl
!= NULL
&& DECL_P (decl
))
344 error ("%+D causes a section type conflict", decl
);
346 error ("section type conflict");
347 /* Make sure we don't error about one section multiple times. */
348 sect
->common
.flags
|= SECTION_OVERRIDE
;
354 /* Return true if the current compilation mode benefits from having
355 objects grouped into blocks. */
358 use_object_blocks_p (void)
360 return flag_section_anchors
;
363 /* Return the object_block structure for section SECT. Create a new
364 structure if we haven't created one already. Return null if SECT
367 static struct object_block
*
368 get_block_for_section (section
*sect
)
370 struct object_block
*block
;
376 = object_block_htab
->find_slot_with_hash (sect
, hash_section (sect
),
381 block
= ggc_cleared_alloc
<object_block
> ();
388 /* Create a symbol with label LABEL and place it at byte offset
389 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
390 is not yet known. LABEL must be a garbage-collected string. */
393 create_block_symbol (const char *label
, struct object_block
*block
,
394 HOST_WIDE_INT offset
)
399 /* Create the extended SYMBOL_REF. */
400 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
401 symbol
= (rtx
) ggc_internal_alloc (size
);
403 /* Initialize the normal SYMBOL_REF fields. */
404 memset (symbol
, 0, size
);
405 PUT_CODE (symbol
, SYMBOL_REF
);
406 PUT_MODE (symbol
, Pmode
);
407 XSTR (symbol
, 0) = label
;
408 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
410 /* Initialize the block_symbol stuff. */
411 SYMBOL_REF_BLOCK (symbol
) = block
;
412 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
417 /* Return a section with a particular name and with whatever SECTION_*
418 flags section_type_flags deems appropriate. The name of the section
419 is taken from NAME if nonnull, otherwise it is taken from DECL's
420 DECL_SECTION_NAME. DECL is the decl associated with the section
421 (see the section comment for details) and RELOC is as for
422 section_type_flags. */
425 get_named_section (tree decl
, const char *name
, int reloc
)
431 gcc_assert (decl
&& DECL_P (decl
) && DECL_SECTION_NAME (decl
));
432 name
= DECL_SECTION_NAME (decl
);
435 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
436 return get_section (name
, flags
, decl
);
439 /* Worker for resolve_unique_section. */
442 set_implicit_section (struct symtab_node
*n
, void *data ATTRIBUTE_UNUSED
)
444 n
->implicit_section
= true;
448 /* If required, set DECL_SECTION_NAME to a unique name. */
451 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
452 int flag_function_or_data_sections
)
454 if (DECL_SECTION_NAME (decl
) == NULL
455 && targetm_common
.have_named_sections
456 && (flag_function_or_data_sections
457 || DECL_COMDAT_GROUP (decl
)))
459 targetm
.asm_out
.unique_section (decl
, reloc
);
460 if (DECL_SECTION_NAME (decl
))
461 symtab_node::get (decl
)->call_for_symbol_and_aliases
462 (set_implicit_section
, NULL
, true);
466 #ifdef BSS_SECTION_ASM_OP
468 #ifdef ASM_OUTPUT_ALIGNED_BSS
470 /* Utility function for targets to use in implementing
471 ASM_OUTPUT_ALIGNED_BSS.
472 ??? It is believed that this function will work in most cases so such
473 support is localized here. */
476 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
477 const char *name
, unsigned HOST_WIDE_INT size
,
480 switch_to_section (bss_section
);
481 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
482 #ifdef ASM_DECLARE_OBJECT_NAME
483 last_assemble_variable_decl
= decl
;
484 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
486 /* Standard thing is just output label for the object. */
487 ASM_OUTPUT_LABEL (file
, name
);
488 #endif /* ASM_DECLARE_OBJECT_NAME */
489 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
494 #endif /* BSS_SECTION_ASM_OP */
496 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
497 /* Return the hot section for function DECL. Return text_section for
501 hot_function_section (tree decl
)
503 if (decl
!= NULL_TREE
504 && DECL_SECTION_NAME (decl
) != NULL
505 && targetm_common
.have_named_sections
)
506 return get_named_section (decl
, NULL
, 0);
512 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
515 When DECL_SECTION_NAME is non-NULL and it is implicit section and
516 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
517 concatenate the name with NAMED_SECTION_SUFFIX.
518 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
521 get_named_text_section (tree decl
,
522 const char *text_section_name
,
523 const char *named_section_suffix
)
525 if (decl
&& DECL_SECTION_NAME (decl
))
527 if (named_section_suffix
)
529 const char *dsn
= DECL_SECTION_NAME (decl
);
530 const char *stripped_name
;
533 name
= (char *) alloca (strlen (dsn
) + 1);
537 stripped_name
= targetm
.strip_name_encoding (name
);
539 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
540 return get_named_section (decl
, buffer
, 0);
542 else if (symtab_node::get (decl
)->implicit_section
)
546 /* Do not try to split gnu_linkonce functions. This gets somewhat
548 if (DECL_COMDAT_GROUP (decl
) && !HAVE_COMDAT_GROUP
)
550 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
551 name
= targetm
.strip_name_encoding (name
);
552 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
558 return get_named_section (decl
, text_section_name
, 0);
561 /* Choose named function section based on its frequency. */
564 default_function_section (tree decl
, enum node_frequency freq
,
565 bool startup
, bool exit
)
567 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
568 /* Old GNU linkers have buggy --gc-section support, which sometimes
569 results in .gcc_except_table* sections being garbage collected. */
571 && symtab_node::get (decl
)->implicit_section
)
575 if (!flag_reorder_functions
576 || !targetm_common
.have_named_sections
)
578 /* Startup code should go to startup subsection unless it is
579 unlikely executed (this happens especially with function splitting
580 where we can split away unnecessary parts of static constructors. */
581 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
583 /* If we do have a profile or(and) LTO phase is executed, we do not need
584 these ELF section. */
585 if (!in_lto_p
|| !flag_profile_values
)
586 return get_named_text_section (decl
, ".text.startup", NULL
);
591 /* Similarly for exit. */
592 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
593 return get_named_text_section (decl
, ".text.exit", NULL
);
595 /* Group cold functions together, similarly for hot code. */
598 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
599 return get_named_text_section (decl
, ".text.unlikely", NULL
);
600 case NODE_FREQUENCY_HOT
:
601 /* If we do have a profile or(and) LTO phase is executed, we do not need
602 these ELF section. */
603 if (!in_lto_p
|| !flag_profile_values
)
604 return get_named_text_section (decl
, ".text.hot", NULL
);
610 /* Return the section for function DECL.
612 If DECL is NULL_TREE, return the text section. We can be passed
613 NULL_TREE under some circumstances by dbxout.c at least.
615 If FORCE_COLD is true, return cold function section ignoring
616 the frequency info of cgraph_node. */
619 function_section_1 (tree decl
, bool force_cold
)
621 section
*section
= NULL
;
622 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
623 bool startup
= false, exit
= false;
627 struct cgraph_node
*node
= cgraph_node::get (decl
);
631 freq
= node
->frequency
;
632 startup
= node
->only_called_at_startup
;
633 exit
= node
->only_called_at_exit
;
637 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
639 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
640 if (decl
!= NULL_TREE
641 && DECL_SECTION_NAME (decl
) != NULL
)
643 if (targetm
.asm_out
.function_section
)
644 section
= targetm
.asm_out
.function_section (decl
, freq
,
648 return get_named_section (decl
, NULL
, 0);
651 return targetm
.asm_out
.select_section
652 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
653 symtab_node::get (decl
)->definition_alignment ());
655 if (targetm
.asm_out
.function_section
)
656 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
659 return hot_function_section (decl
);
663 /* Return the section for function DECL.
665 If DECL is NULL_TREE, return the text section. We can be passed
666 NULL_TREE under some circumstances by dbxout.c at least. */
669 function_section (tree decl
)
671 /* Handle cases where function splitting code decides
672 to put function entry point into unlikely executed section
673 despite the fact that the function itself is not cold
674 (i.e. it is called rarely but contains a hot loop that is
675 better to live in hot subsection for the code locality). */
676 return function_section_1 (decl
,
677 first_function_block_is_cold
);
680 /* Return the section for the current function, take IN_COLD_SECTION_P
684 current_function_section (void)
686 return function_section_1 (current_function_decl
, in_cold_section_p
);
689 /* Tell assembler to switch to unlikely-to-be-executed text section. */
692 unlikely_text_section (void)
694 return function_section_1 (current_function_decl
, true);
697 /* When called within a function context, return true if the function
698 has been assigned a cold text section and if SECT is that section.
699 When called outside a function context, return true if SECT is the
700 default cold section. */
703 unlikely_text_section_p (section
*sect
)
705 return sect
== function_section_1 (current_function_decl
, true);
708 /* Return the read-only data section associated with function DECL. */
711 default_function_rodata_section (tree decl
)
713 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
715 const char *name
= DECL_SECTION_NAME (decl
);
717 if (DECL_COMDAT_GROUP (decl
) && HAVE_COMDAT_GROUP
)
723 dot
= strchr (name
+ 1, '.');
726 len
= strlen (dot
) + 8;
727 rname
= (char *) alloca (len
);
729 strcpy (rname
, ".rodata");
731 return get_section (rname
, SECTION_LINKONCE
, decl
);
733 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
734 else if (DECL_COMDAT_GROUP (decl
)
735 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
737 size_t len
= strlen (name
) + 1;
738 char *rname
= (char *) alloca (len
);
740 memcpy (rname
, name
, len
);
742 return get_section (rname
, SECTION_LINKONCE
, decl
);
744 /* For .text.foo we want to use .rodata.foo. */
745 else if (flag_function_sections
&& flag_data_sections
746 && strncmp (name
, ".text.", 6) == 0)
748 size_t len
= strlen (name
) + 1;
749 char *rname
= (char *) alloca (len
+ 2);
751 memcpy (rname
, ".rodata", 7);
752 memcpy (rname
+ 7, name
+ 5, len
- 5);
753 return get_section (rname
, 0, decl
);
757 return readonly_data_section
;
760 /* Return the read-only data section associated with function DECL
761 for targets where that section should be always the single
762 readonly data section. */
765 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
767 return readonly_data_section
;
770 /* A subroutine of mergeable_string_section and mergeable_constant_section. */
773 function_mergeable_rodata_prefix (void)
775 section
*s
= targetm
.asm_out
.function_rodata_section (current_function_decl
);
776 if (SECTION_STYLE (s
) == SECTION_NAMED
)
777 return s
->named
.name
;
779 return targetm
.asm_out
.mergeable_rodata_prefix
;
782 /* Return the section to use for string merging. */
785 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
786 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
787 unsigned int flags ATTRIBUTE_UNUSED
)
791 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
792 && TREE_CODE (decl
) == STRING_CST
793 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
795 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
796 && TREE_STRING_LENGTH (decl
) >= len
)
799 unsigned int modesize
;
803 const char *prefix
= function_mergeable_rodata_prefix ();
804 char *name
= (char *) alloca (strlen (prefix
) + 30);
806 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
807 modesize
= GET_MODE_BITSIZE (mode
);
808 if (modesize
>= 8 && modesize
<= 256
809 && (modesize
& (modesize
- 1)) == 0)
811 if (align
< modesize
)
814 str
= TREE_STRING_POINTER (decl
);
815 unit
= GET_MODE_SIZE (mode
);
817 /* Check for embedded NUL characters. */
818 for (i
= 0; i
< len
; i
+= unit
)
820 for (j
= 0; j
< unit
; j
++)
821 if (str
[i
+ j
] != '\0')
828 sprintf (name
, "%s.str%d.%d", prefix
,
829 modesize
/ 8, (int) (align
/ 8));
830 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
831 return get_section (name
, flags
, NULL
);
836 return readonly_data_section
;
839 /* Return the section to use for constant merging. */
842 mergeable_constant_section (machine_mode mode ATTRIBUTE_UNUSED
,
843 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
844 unsigned int flags ATTRIBUTE_UNUSED
)
846 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
848 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
854 && (align
& (align
- 1)) == 0)
856 const char *prefix
= function_mergeable_rodata_prefix ();
857 char *name
= (char *) alloca (strlen (prefix
) + 30);
859 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
860 flags
|= (align
/ 8) | SECTION_MERGE
;
861 return get_section (name
, flags
, NULL
);
863 return readonly_data_section
;
866 /* Given NAME, a putative register name, discard any customary prefixes. */
869 strip_reg_name (const char *name
)
871 #ifdef REGISTER_PREFIX
872 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
873 name
+= strlen (REGISTER_PREFIX
);
875 if (name
[0] == '%' || name
[0] == '#')
880 /* The user has asked for a DECL to have a particular name. Set (or
881 change) it in such a way that we don't prefix an underscore to
884 set_user_assembler_name (tree decl
, const char *name
)
886 char *starred
= (char *) alloca (strlen (name
) + 2);
888 strcpy (starred
+ 1, name
);
889 symtab
->change_decl_assembler_name (decl
, get_identifier (starred
));
890 SET_DECL_RTL (decl
, NULL_RTX
);
893 /* Decode an `asm' spec for a declaration as a register name.
894 Return the register number, or -1 if nothing specified,
895 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
896 or -3 if ASMSPEC is `cc' and is not recognized,
897 or -4 if ASMSPEC is `memory' and is not recognized.
898 Accept an exact spelling or a decimal number.
899 Prefixes such as % are optional. */
902 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
904 /* Presume just one register is clobbered. */
911 /* Get rid of confusing prefixes. */
912 asmspec
= strip_reg_name (asmspec
);
914 /* Allow a decimal number as a "register name". */
915 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
916 if (! ISDIGIT (asmspec
[i
]))
918 if (asmspec
[0] != 0 && i
< 0)
921 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0 && reg_names
[i
][0])
927 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
929 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
932 #ifdef OVERLAPPING_REGISTER_NAMES
936 const char *const name
;
939 } table
[] = OVERLAPPING_REGISTER_NAMES
;
941 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
943 && ! strcmp (asmspec
, table
[i
].name
))
945 *pnregs
= table
[i
].nregs
;
946 return table
[i
].number
;
949 #endif /* OVERLAPPING_REGISTER_NAMES */
951 #ifdef ADDITIONAL_REGISTER_NAMES
953 static const struct { const char *const name
; const int number
; } table
[]
954 = ADDITIONAL_REGISTER_NAMES
;
956 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
958 && ! strcmp (asmspec
, table
[i
].name
)
959 && reg_names
[table
[i
].number
][0])
960 return table
[i
].number
;
962 #endif /* ADDITIONAL_REGISTER_NAMES */
964 if (!strcmp (asmspec
, "memory"))
967 if (!strcmp (asmspec
, "cc"))
977 decode_reg_name (const char *name
)
980 return decode_reg_name_and_count (name
, &count
);
984 /* Return true if DECL's initializer is suitable for a BSS section. */
987 bss_initializer_p (const_tree decl
)
989 return (DECL_INITIAL (decl
) == NULL
990 /* In LTO we have no errors in program; error_mark_node is used
991 to mark offlined constructors. */
992 || (DECL_INITIAL (decl
) == error_mark_node
994 || (flag_zero_initialized_in_bss
995 /* Leave constant zeroes in .rodata so they
997 && !TREE_READONLY (decl
)
998 && initializer_zerop (DECL_INITIAL (decl
))));
1001 /* Compute the alignment of variable specified by DECL.
1002 DONT_OUTPUT_DATA is from assemble_variable. */
1005 align_variable (tree decl
, bool dont_output_data
)
1007 unsigned int align
= DECL_ALIGN (decl
);
1009 /* In the case for initialing an array whose length isn't specified,
1010 where we have not yet been able to do the layout,
1011 figure out the proper alignment now. */
1012 if (dont_output_data
&& DECL_SIZE (decl
) == 0
1013 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
1014 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
1016 /* Some object file formats have a maximum alignment which they support.
1017 In particular, a.out format supports a maximum alignment of 4. */
1018 if (align
> MAX_OFILE_ALIGNMENT
)
1020 error ("alignment of %q+D is greater than maximum object "
1021 "file alignment %d", decl
,
1022 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
1023 align
= MAX_OFILE_ALIGNMENT
;
1026 if (! DECL_USER_ALIGN (decl
))
1028 #ifdef DATA_ABI_ALIGNMENT
1029 unsigned int data_abi_align
1030 = DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1031 /* For backwards compatibility, don't assume the ABI alignment for
1033 if (! DECL_THREAD_LOCAL_P (decl
) || data_abi_align
<= BITS_PER_WORD
)
1034 align
= data_abi_align
;
1037 /* On some machines, it is good to increase alignment sometimes.
1038 But as DECL_ALIGN is used both for actually emitting the variable
1039 and for code accessing the variable as guaranteed alignment, we
1040 can only increase the alignment if it is a performance optimization
1041 if the references to it must bind to the current definition. */
1042 if (decl_binds_to_current_def_p (decl
)
1043 && !DECL_VIRTUAL_P (decl
))
1045 #ifdef DATA_ALIGNMENT
1046 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1047 /* Don't increase alignment too much for TLS variables - TLS space
1049 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1052 #ifdef CONSTANT_ALIGNMENT
1053 if (DECL_INITIAL (decl
) != 0
1054 /* In LTO we have no errors in program; error_mark_node is used
1055 to mark offlined constructors. */
1056 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1058 unsigned int const_align
1059 = CONSTANT_ALIGNMENT (DECL_INITIAL (decl
), align
);
1060 /* Don't increase alignment too much for TLS variables - TLS
1061 space is too precious. */
1062 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1063 align
= const_align
;
1069 /* Reset the alignment in case we have made it tighter, so we can benefit
1070 from it in get_pointer_alignment. */
1071 DECL_ALIGN (decl
) = align
;
1074 /* Return DECL_ALIGN (decl), possibly increased for optimization purposes
1075 beyond what align_variable returned. */
1078 get_variable_align (tree decl
)
1080 unsigned int align
= DECL_ALIGN (decl
);
1082 /* For user aligned vars or static vars align_variable already did
1084 if (DECL_USER_ALIGN (decl
) || !TREE_PUBLIC (decl
))
1087 #ifdef DATA_ABI_ALIGNMENT
1088 if (DECL_THREAD_LOCAL_P (decl
))
1089 align
= DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1092 /* For decls that bind to the current definition, align_variable
1093 did also everything, except for not assuming ABI required alignment
1094 of TLS variables. For other vars, increase the alignment here
1095 as an optimization. */
1096 if (!decl_binds_to_current_def_p (decl
))
1098 /* On some machines, it is good to increase alignment sometimes. */
1099 #ifdef DATA_ALIGNMENT
1100 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1101 /* Don't increase alignment too much for TLS variables - TLS space
1103 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1106 #ifdef CONSTANT_ALIGNMENT
1107 if (DECL_INITIAL (decl
) != 0
1108 /* In LTO we have no errors in program; error_mark_node is used
1109 to mark offlined constructors. */
1110 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1112 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
1114 /* Don't increase alignment too much for TLS variables - TLS space
1116 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1117 align
= const_align
;
1125 /* Return the section into which the given VAR_DECL or CONST_DECL
1126 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1127 section should be used wherever possible. */
1130 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1132 addr_space_t as
= ADDR_SPACE_GENERIC
;
1134 varpool_node
*vnode
= varpool_node::get (decl
);
1137 vnode
= vnode
->ultimate_alias_target ();
1141 if (TREE_TYPE (decl
) != error_mark_node
)
1142 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1144 /* We need the constructor to figure out reloc flag. */
1146 vnode
->get_constructor ();
1148 if (DECL_COMMON (decl
))
1150 /* If the decl has been given an explicit section name, or it resides
1151 in a non-generic address space, then it isn't common, and shouldn't
1152 be handled as such. */
1153 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1154 && ADDR_SPACE_GENERIC_P (as
));
1155 if (DECL_THREAD_LOCAL_P (decl
))
1156 return tls_comm_section
;
1157 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1158 return comm_section
;
1161 if (DECL_INITIAL (decl
) == error_mark_node
)
1162 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1163 else if (DECL_INITIAL (decl
))
1164 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1168 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1169 if (IN_NAMED_SECTION (decl
))
1170 return get_named_section (decl
, NULL
, reloc
);
1172 if (ADDR_SPACE_GENERIC_P (as
)
1173 && !DECL_THREAD_LOCAL_P (decl
)
1174 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1175 && bss_initializer_p (decl
))
1177 if (!TREE_PUBLIC (decl
)
1178 && !((flag_sanitize
& SANITIZE_ADDRESS
)
1179 && asan_protect_global (decl
)))
1180 return lcomm_section
;
1181 if (bss_noswitch_section
)
1182 return bss_noswitch_section
;
1185 return targetm
.asm_out
.select_section (decl
, reloc
,
1186 get_variable_align (decl
));
1189 /* Return the block into which object_block DECL should be placed. */
1191 static struct object_block
*
1192 get_block_for_decl (tree decl
)
1196 if (TREE_CODE (decl
) == VAR_DECL
)
1198 /* The object must be defined in this translation unit. */
1199 if (DECL_EXTERNAL (decl
))
1202 /* There's no point using object blocks for something that is
1203 isolated by definition. */
1204 if (DECL_COMDAT_GROUP (decl
))
1208 /* We can only calculate block offsets if the decl has a known
1210 if (DECL_SIZE_UNIT (decl
) == NULL
)
1212 if (!tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
)))
1215 /* Find out which section should contain DECL. We cannot put it into
1216 an object block if it requires a standalone definition. */
1217 if (TREE_CODE (decl
) == VAR_DECL
)
1218 align_variable (decl
, 0);
1219 sect
= get_variable_section (decl
, true);
1220 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1223 return get_block_for_section (sect
);
1226 /* Make sure block symbol SYMBOL is in block BLOCK. */
1229 change_symbol_block (rtx symbol
, struct object_block
*block
)
1231 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1233 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1234 SYMBOL_REF_BLOCK (symbol
) = block
;
1238 /* Return true if it is possible to put DECL in an object_block. */
1241 use_blocks_for_decl_p (tree decl
)
1243 struct symtab_node
*snode
;
1245 /* Only data DECLs can be placed into object blocks. */
1246 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1249 /* Detect decls created by dw2_force_const_mem. Such decls are
1250 special because DECL_INITIAL doesn't specify the decl's true value.
1251 dw2_output_indirect_constants will instead call assemble_variable
1252 with dont_output_data set to 1 and then print the contents itself. */
1253 if (DECL_INITIAL (decl
) == decl
)
1256 /* If this decl is an alias, then we don't want to emit a
1258 if (TREE_CODE (decl
) == VAR_DECL
1259 && (snode
= symtab_node::get (decl
)) != NULL
1263 return targetm
.use_blocks_for_decl_p (decl
);
1266 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
1267 until we find an identifier that is not itself a transparent alias.
1268 Modify the alias passed to it by reference (and all aliases on the
1269 way to the ultimate target), such that they do not have to be
1270 followed again, and return the ultimate target of the alias
1274 ultimate_transparent_alias_target (tree
*alias
)
1276 tree target
= *alias
;
1278 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
1280 gcc_assert (TREE_CHAIN (target
));
1281 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
1282 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
1283 && ! TREE_CHAIN (target
));
1290 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1291 have static storage duration. In other words, it should not be an
1292 automatic variable, including PARM_DECLs.
1294 There is, however, one exception: this function handles variables
1295 explicitly placed in a particular register by the user.
1297 This is never called for PARM_DECL nodes. */
1300 make_decl_rtl (tree decl
)
1302 const char *name
= 0;
1307 /* Check that we are not being given an automatic variable. */
1308 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1309 && TREE_CODE (decl
) != RESULT_DECL
);
1311 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1312 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1313 || TREE_STATIC (decl
)
1314 || TREE_PUBLIC (decl
)
1315 || DECL_EXTERNAL (decl
)
1316 || DECL_REGISTER (decl
));
1318 /* And that we were not given a type or a label. */
1319 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1320 && TREE_CODE (decl
) != LABEL_DECL
);
1322 /* For a duplicate declaration, we can be called twice on the
1323 same DECL node. Don't discard the RTL already made. */
1324 if (DECL_RTL_SET_P (decl
))
1326 /* If the old RTL had the wrong mode, fix the mode. */
1327 x
= DECL_RTL (decl
);
1328 if (GET_MODE (x
) != DECL_MODE (decl
))
1329 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1331 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1334 /* ??? Another way to do this would be to maintain a hashed
1335 table of such critters. Instead of adding stuff to a DECL
1336 to give certain attributes to it, we could use an external
1337 hash map from DECL to set of attributes. */
1339 /* Let the target reassign the RTL if it wants.
1340 This is necessary, for example, when one machine specific
1341 decl attribute overrides another. */
1342 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1344 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1345 on the new decl information. */
1347 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1348 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1349 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1354 /* If this variable belongs to the global constant pool, retrieve the
1355 pre-computed RTL or recompute it in LTO mode. */
1356 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_IN_CONSTANT_POOL (decl
))
1358 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1362 id
= DECL_ASSEMBLER_NAME (decl
);
1363 if (TREE_CODE (decl
) == FUNCTION_DECL
1364 && cgraph_node::get (decl
)
1365 && cgraph_node::get (decl
)->instrumentation_clone
)
1366 ultimate_transparent_alias_target (&id
);
1367 name
= IDENTIFIER_POINTER (id
);
1369 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1370 && DECL_REGISTER (decl
))
1372 error ("register name not specified for %q+D", decl
);
1374 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1376 const char *asmspec
= name
+1;
1377 machine_mode mode
= DECL_MODE (decl
);
1378 reg_number
= decode_reg_name (asmspec
);
1379 /* First detect errors in declaring global registers. */
1380 if (reg_number
== -1)
1381 error ("register name not specified for %q+D", decl
);
1382 else if (reg_number
< 0)
1383 error ("invalid register name for %q+D", decl
);
1384 else if (mode
== BLKmode
)
1385 error ("data type of %q+D isn%'t suitable for a register",
1387 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1388 error ("the register specified for %q+D cannot be accessed"
1389 " by the current target", decl
);
1390 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1391 error ("the register specified for %q+D is not general enough"
1392 " to be used as a register variable", decl
);
1393 else if (!HARD_REGNO_MODE_OK (reg_number
, mode
))
1394 error ("register specified for %q+D isn%'t suitable for data type",
1396 /* Now handle properly declared static register variables. */
1401 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1403 DECL_INITIAL (decl
) = 0;
1404 error ("global register variable has initial value");
1406 if (TREE_THIS_VOLATILE (decl
))
1407 warning (OPT_Wvolatile_register_var
,
1408 "optimization may eliminate reads and/or "
1409 "writes to register variables");
1411 /* If the user specified one of the eliminables registers here,
1412 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1413 confused with that register and be eliminated. This usage is
1414 somewhat suspect... */
1416 SET_DECL_RTL (decl
, gen_raw_REG (mode
, reg_number
));
1417 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1418 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1420 if (TREE_STATIC (decl
))
1422 /* Make this register global, so not usable for anything
1424 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1425 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1426 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1428 nregs
= hard_regno_nregs
[reg_number
][mode
];
1430 globalize_reg (decl
, reg_number
+ --nregs
);
1433 /* As a register variable, it has no section. */
1436 /* Avoid internal errors from invalid register
1438 SET_DECL_ASSEMBLER_NAME (decl
, NULL_TREE
);
1439 DECL_HARD_REGISTER (decl
) = 0;
1442 /* Now handle ordinary static variables and functions (in memory).
1443 Also handle vars declared register invalidly. */
1444 else if (name
[0] == '*')
1446 #ifdef REGISTER_PREFIX
1447 if (strlen (REGISTER_PREFIX
) != 0)
1449 reg_number
= decode_reg_name (name
);
1450 if (reg_number
>= 0 || reg_number
== -3)
1451 error ("register name given for non-register variable %q+D", decl
);
1456 /* Specifying a section attribute on a variable forces it into a
1457 non-.bss section, and thus it cannot be common. */
1458 /* FIXME: In general this code should not be necessary because
1459 visibility pass is doing the same work. But notice_global_symbol
1460 is called early and it needs to make DECL_RTL to get the name.
1461 we take care of recomputing the DECL_RTL after visibility is changed. */
1462 if (TREE_CODE (decl
) == VAR_DECL
1463 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
))
1464 && DECL_SECTION_NAME (decl
) != NULL
1465 && DECL_INITIAL (decl
) == NULL_TREE
1466 && DECL_COMMON (decl
))
1467 DECL_COMMON (decl
) = 0;
1469 /* Variables can't be both common and weak. */
1470 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1471 DECL_COMMON (decl
) = 0;
1473 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1474 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1477 machine_mode address_mode
= Pmode
;
1478 if (TREE_TYPE (decl
) != error_mark_node
)
1480 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1481 address_mode
= targetm
.addr_space
.address_mode (as
);
1483 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1485 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1486 SET_SYMBOL_REF_DECL (x
, decl
);
1488 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1489 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1490 set_mem_attributes (x
, decl
, 1);
1491 SET_DECL_RTL (decl
, x
);
1493 /* Optionally set flags or add text to the name to record information
1494 such as that it is a function name.
1495 If the name is changed, the macro ASM_OUTPUT_LABELREF
1496 will have to know how to strip this information. */
1497 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1500 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1501 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1505 make_decl_rtl_for_debug (tree decl
)
1507 unsigned int save_aliasing_flag
;
1510 if (DECL_RTL_SET_P (decl
))
1511 return DECL_RTL (decl
);
1513 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1514 call new_alias_set. If running with -fcompare-debug, sometimes
1515 we do not want to create alias sets that will throw the alias
1516 numbers off in the comparison dumps. So... clearing
1517 flag_strict_aliasing will keep new_alias_set() from creating a
1519 save_aliasing_flag
= flag_strict_aliasing
;
1520 flag_strict_aliasing
= 0;
1522 rtl
= DECL_RTL (decl
);
1523 /* Reset DECL_RTL back, as various parts of the compiler expects
1524 DECL_RTL set meaning it is actually going to be output. */
1525 SET_DECL_RTL (decl
, NULL
);
1527 flag_strict_aliasing
= save_aliasing_flag
;
1531 /* Output a string of literal assembler code
1532 for an `asm' keyword used between functions. */
1535 assemble_asm (tree string
)
1540 if (TREE_CODE (string
) == ADDR_EXPR
)
1541 string
= TREE_OPERAND (string
, 0);
1543 p
= TREE_STRING_POINTER (string
);
1544 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1547 /* Write the address of the entity given by SYMBOL to SEC. */
1549 assemble_addr_to_section (rtx symbol
, section
*sec
)
1551 switch_to_section (sec
);
1552 assemble_align (POINTER_SIZE
);
1553 assemble_integer (symbol
, POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
1556 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1557 not) section for PRIORITY. */
1559 get_cdtor_priority_section (int priority
, bool constructor_p
)
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 || (TREE_CODE (decl
) == VAR_DECL
&& DECL_HARD_REGISTER (decl
))
1643 || (TREE_CODE (decl
) != FUNCTION_DECL
1644 && (TREE_CODE (decl
) != VAR_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 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1796 align_functions_log
, align_functions
- 1);
1798 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1802 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1803 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1806 if (!DECL_IGNORED_P (decl
))
1807 (*debug_hooks
->begin_function
) (decl
);
1809 /* Make function name accessible from other files, if appropriate. */
1811 if (TREE_PUBLIC (decl
)
1812 || (cgraph_node::get (decl
)->instrumentation_clone
1813 && cgraph_node::get (decl
)->instrumented_version
1814 && TREE_PUBLIC (cgraph_node::get (decl
)->instrumented_version
->decl
)))
1816 notice_global_symbol (decl
);
1818 globalize_decl (decl
);
1820 maybe_assemble_visibility (decl
);
1823 if (DECL_PRESERVE_P (decl
))
1824 targetm
.asm_out
.mark_decl_preserved (fnname
);
1826 /* Do any machine/system dependent processing of the function name. */
1827 #ifdef ASM_DECLARE_FUNCTION_NAME
1828 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1830 /* Standard thing is just output label for the function. */
1831 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1832 #endif /* ASM_DECLARE_FUNCTION_NAME */
1834 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1835 saw_no_split_stack
= true;
1838 /* Output assembler code associated with defining the size of the
1839 function. DECL describes the function. NAME is the function's name. */
1842 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1844 #ifdef ASM_DECLARE_FUNCTION_SIZE
1845 /* We could have switched section in the middle of the function. */
1846 if (flag_reorder_blocks_and_partition
)
1847 switch_to_section (function_section (decl
));
1848 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1850 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1852 output_constant_pool (fnname
, decl
);
1853 switch_to_section (function_section (decl
)); /* need to switch back */
1855 /* Output labels for end of hot/cold text sections (to be used by
1857 if (flag_reorder_blocks_and_partition
)
1859 section
*save_text_section
;
1861 save_text_section
= in_section
;
1862 switch_to_section (unlikely_text_section ());
1863 #ifdef ASM_DECLARE_COLD_FUNCTION_SIZE
1864 if (cold_function_name
!= NULL_TREE
)
1865 ASM_DECLARE_COLD_FUNCTION_SIZE (asm_out_file
,
1866 IDENTIFIER_POINTER (cold_function_name
),
1869 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1870 if (first_function_block_is_cold
)
1871 switch_to_section (text_section
);
1873 switch_to_section (function_section (decl
));
1874 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1875 switch_to_section (save_text_section
);
1879 /* Assemble code to leave SIZE bytes of zeros. */
1882 assemble_zeros (unsigned HOST_WIDE_INT size
)
1884 /* Do no output if -fsyntax-only. */
1885 if (flag_syntax_only
)
1888 #ifdef ASM_NO_SKIP_IN_TEXT
1889 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1890 so we must output 0s explicitly in the text section. */
1891 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1893 unsigned HOST_WIDE_INT i
;
1894 for (i
= 0; i
< size
; i
++)
1895 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1900 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1903 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1906 assemble_align (int align
)
1908 if (align
> BITS_PER_UNIT
)
1910 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1914 /* Assemble a string constant with the specified C string as contents. */
1917 assemble_string (const char *p
, int size
)
1922 /* If the string is very long, split it up. */
1926 int thissize
= size
- pos
;
1927 if (thissize
> maximum
)
1930 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1938 /* A noswitch_section_callback for lcomm_section. */
1941 emit_local (tree decl ATTRIBUTE_UNUSED
,
1942 const char *name ATTRIBUTE_UNUSED
,
1943 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1944 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1946 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1947 unsigned int align
= symtab_node::get (decl
)->definition_alignment ();
1948 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1951 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1952 unsigned int align
= symtab_node::get (decl
)->definition_alignment ();
1953 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, align
);
1956 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1961 /* A noswitch_section_callback for bss_noswitch_section. */
1963 #if defined ASM_OUTPUT_ALIGNED_BSS
1965 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1966 const char *name ATTRIBUTE_UNUSED
,
1967 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1968 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1970 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
,
1971 get_variable_align (decl
));
1976 /* A noswitch_section_callback for comm_section. */
1979 emit_common (tree decl ATTRIBUTE_UNUSED
,
1980 const char *name ATTRIBUTE_UNUSED
,
1981 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1982 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1984 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1985 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1986 size
, get_variable_align (decl
));
1988 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1989 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
,
1990 get_variable_align (decl
));
1993 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1998 /* A noswitch_section_callback for tls_comm_section. */
2001 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
2002 const char *name ATTRIBUTE_UNUSED
,
2003 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
2004 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2006 #ifdef ASM_OUTPUT_TLS_COMMON
2007 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
2010 sorry ("thread-local COMMON data not implemented");
2015 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
2016 NAME is the name of DECL's SYMBOL_REF. */
2019 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
,
2022 unsigned HOST_WIDE_INT size
, rounded
;
2024 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2027 if ((flag_sanitize
& SANITIZE_ADDRESS
) && asan_protect_global (decl
))
2028 size
+= asan_red_zone_size (size
);
2030 /* Don't allocate zero bytes of common,
2031 since that means "undefined external" in the linker. */
2035 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2036 so that each uninitialized object starts on such a boundary. */
2037 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
2038 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2039 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2041 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
2042 && (unsigned HOST_WIDE_INT
) (align
/ BITS_PER_UNIT
) > rounded
)
2043 error ("requested alignment for %q+D is greater than "
2044 "implemented alignment of %wu", decl
, rounded
);
2047 /* A subroutine of assemble_variable. Output the label and contents of
2048 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
2049 is as for assemble_variable. */
2052 assemble_variable_contents (tree decl
, const char *name
,
2053 bool dont_output_data
)
2055 /* Do any machine/system dependent processing of the object. */
2056 #ifdef ASM_DECLARE_OBJECT_NAME
2057 last_assemble_variable_decl
= decl
;
2058 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
2060 /* Standard thing is just output label for the object. */
2061 ASM_OUTPUT_LABEL (asm_out_file
, name
);
2062 #endif /* ASM_DECLARE_OBJECT_NAME */
2064 if (!dont_output_data
)
2066 /* Caller is supposed to use varpool_get_constructor when it wants
2067 to output the body. */
2068 gcc_assert (!in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
);
2069 if (DECL_INITIAL (decl
)
2070 && DECL_INITIAL (decl
) != error_mark_node
2071 && !initializer_zerop (DECL_INITIAL (decl
)))
2072 /* Output the actual data. */
2073 output_constant (DECL_INITIAL (decl
),
2074 tree_to_uhwi (DECL_SIZE_UNIT (decl
)),
2075 get_variable_align (decl
));
2077 /* Leave space for it. */
2078 assemble_zeros (tree_to_uhwi (DECL_SIZE_UNIT (decl
)));
2079 targetm
.asm_out
.decl_end ();
2083 /* Write out assembly for the variable DECL, which is not defined in
2084 the current translation unit. */
2086 assemble_undefined_decl (tree decl
)
2088 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
2089 targetm
.asm_out
.assemble_undefined_decl (asm_out_file
, name
, decl
);
2092 /* Assemble everything that is needed for a variable or function declaration.
2093 Not used for automatic variables, and not used for function definitions.
2094 Should not be called for variables of incomplete structure type.
2096 TOP_LEVEL is nonzero if this variable has file scope.
2097 AT_END is nonzero if this is the special handling, at end of compilation,
2098 to define things that have had only tentative definitions.
2099 DONT_OUTPUT_DATA if nonzero means don't actually output the
2100 initial value (that will be done by the caller). */
2103 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
2104 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
2107 rtx decl_rtl
, symbol
;
2110 bool asan_protected
= false;
2112 /* This function is supposed to handle VARIABLES. Ensure we have one. */
2113 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
2115 /* Emulated TLS had better not get this far. */
2116 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
2118 last_assemble_variable_decl
= 0;
2120 /* Normally no need to say anything here for external references,
2121 since assemble_external is called by the language-specific code
2122 when a declaration is first seen. */
2124 if (DECL_EXTERNAL (decl
))
2127 /* Do nothing for global register variables. */
2128 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
2130 TREE_ASM_WRITTEN (decl
) = 1;
2134 /* If type was incomplete when the variable was declared,
2135 see if it is complete now. */
2137 if (DECL_SIZE (decl
) == 0)
2138 layout_decl (decl
, 0);
2140 /* Still incomplete => don't allocate it; treat the tentative defn
2141 (which is what it must have been) as an `extern' reference. */
2143 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2145 error ("storage size of %q+D isn%'t known", decl
);
2146 TREE_ASM_WRITTEN (decl
) = 1;
2150 /* The first declaration of a variable that comes through this function
2151 decides whether it is global (in C, has external linkage)
2152 or local (in C, has internal linkage). So do nothing more
2153 if this function has already run. */
2155 if (TREE_ASM_WRITTEN (decl
))
2158 /* Make sure targetm.encode_section_info is invoked before we set
2160 decl_rtl
= DECL_RTL (decl
);
2162 TREE_ASM_WRITTEN (decl
) = 1;
2164 /* Do no output if -fsyntax-only. */
2165 if (flag_syntax_only
)
2168 if (! dont_output_data
2169 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
2171 error ("size of variable %q+D is too large", decl
);
2175 gcc_assert (MEM_P (decl_rtl
));
2176 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2177 symbol
= XEXP (decl_rtl
, 0);
2179 /* If this symbol belongs to the tree constant pool, output the constant
2180 if it hasn't already been written. */
2181 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
2183 tree decl
= SYMBOL_REF_DECL (symbol
);
2184 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
2185 output_constant_def_contents (symbol
);
2191 name
= XSTR (symbol
, 0);
2192 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2193 notice_global_symbol (decl
);
2195 /* Compute the alignment of this data. */
2197 align_variable (decl
, dont_output_data
);
2199 if ((flag_sanitize
& SANITIZE_ADDRESS
)
2200 && asan_protect_global (decl
))
2202 asan_protected
= true;
2203 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
2204 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
2207 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2209 align
= get_variable_align (decl
);
2211 if (TREE_PUBLIC (decl
))
2212 maybe_assemble_visibility (decl
);
2214 if (DECL_PRESERVE_P (decl
))
2215 targetm
.asm_out
.mark_decl_preserved (name
);
2217 /* First make the assembler name(s) global if appropriate. */
2218 sect
= get_variable_section (decl
, false);
2219 if (TREE_PUBLIC (decl
)
2220 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2221 globalize_decl (decl
);
2223 /* Output any data that we will need to use the address of. */
2224 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2225 output_addressed_constants (DECL_INITIAL (decl
));
2227 /* dbxout.c needs to know this. */
2228 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2229 DECL_IN_TEXT_SECTION (decl
) = 1;
2231 /* If the decl is part of an object_block, make sure that the decl
2232 has been positioned within its block, but do not write out its
2233 definition yet. output_object_blocks will do that later. */
2234 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2236 gcc_assert (!dont_output_data
);
2237 place_block_symbol (symbol
);
2239 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2240 assemble_noswitch_variable (decl
, name
, sect
, align
);
2243 /* The following bit of code ensures that vtable_map
2244 variables are not only in the comdat section, but that
2245 each variable has its own unique comdat name. If this
2246 code is removed, the variables end up in the same section
2247 with a single comdat name.
2249 FIXME: resolve_unique_section needs to deal better with
2250 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
2251 that is fixed, this if-else statement can be replaced with
2252 a single call to "switch_to_section (sect)". */
2253 if (sect
->named
.name
2254 && (strcmp (sect
->named
.name
, ".vtable_map_vars") == 0))
2256 #if defined (OBJECT_FORMAT_ELF)
2257 targetm
.asm_out
.named_section (sect
->named
.name
,
2258 sect
->named
.common
.flags
2262 #elif defined (TARGET_PECOFF)
2263 /* Neither OBJECT_FORMAT_PE, nor OBJECT_FORMAT_COFF is set here.
2264 Therefore the following check is used.
2265 In case a the target is PE or COFF a comdat group section
2266 is created, e.g. .vtable_map_vars$foo. The linker places
2267 everything in .vtable_map_vars at the end.
2269 A fix could be made in
2270 gcc/config/i386/winnt.c: i386_pe_unique_section. */
2275 if (TREE_CODE (DECL_NAME (decl
)) == IDENTIFIER_NODE
)
2276 name
= ACONCAT ((sect
->named
.name
, "$",
2277 IDENTIFIER_POINTER (DECL_NAME (decl
)), NULL
));
2279 name
= ACONCAT ((sect
->named
.name
, "$",
2280 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (DECL_NAME (decl
))),
2283 targetm
.asm_out
.named_section (name
,
2284 sect
->named
.common
.flags
2290 switch_to_section (sect
);
2294 switch_to_section (sect
);
2295 if (align
> BITS_PER_UNIT
)
2296 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
2297 assemble_variable_contents (decl
, name
, dont_output_data
);
2300 unsigned HOST_WIDE_INT
int size
2301 = tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2302 assemble_zeros (asan_red_zone_size (size
));
2308 /* Given a function declaration (FN_DECL), this function assembles the
2309 function into the .preinit_array section. */
2312 assemble_vtv_preinit_initializer (tree fn_decl
)
2315 unsigned flags
= SECTION_WRITE
;
2316 rtx symbol
= XEXP (DECL_RTL (fn_decl
), 0);
2318 flags
|= SECTION_NOTYPE
;
2319 sect
= get_section (".preinit_array", flags
, fn_decl
);
2320 switch_to_section (sect
);
2321 assemble_addr_to_section (symbol
, sect
);
2324 /* Return 1 if type TYPE contains any pointers. */
2327 contains_pointers_p (tree type
)
2329 switch (TREE_CODE (type
))
2332 case REFERENCE_TYPE
:
2333 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2334 so I'll play safe and return 1. */
2340 case QUAL_UNION_TYPE
:
2343 /* For a type that has fields, see if the fields have pointers. */
2344 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2345 if (TREE_CODE (fields
) == FIELD_DECL
2346 && contains_pointers_p (TREE_TYPE (fields
)))
2352 /* An array type contains pointers if its element type does. */
2353 return contains_pointers_p (TREE_TYPE (type
));
2360 /* We delay assemble_external processing until
2361 the compilation unit is finalized. This is the best we can do for
2362 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2363 it all the way to final. See PR 17982 for further discussion. */
2364 static GTY(()) tree pending_assemble_externals
;
2366 #ifdef ASM_OUTPUT_EXTERNAL
2367 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2368 As a result, assemble_external can be called after the list of externals
2369 is processed and the pointer set destroyed. */
2370 static bool pending_assemble_externals_processed
;
2372 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2373 TREE_LIST in assemble_external. */
2374 static hash_set
<tree
> *pending_assemble_externals_set
;
2376 /* True if DECL is a function decl for which no out-of-line copy exists.
2377 It is assumed that DECL's assembler name has been set. */
2380 incorporeal_function_p (tree decl
)
2382 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2386 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2387 && (DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
2388 || DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA_WITH_ALIGN
))
2391 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2392 /* Atomic or sync builtins which have survived this far will be
2393 resolved externally and therefore are not incorporeal. */
2394 if (strncmp (name
, "__builtin_", 10) == 0)
2400 /* Actually do the tests to determine if this is necessary, and invoke
2401 ASM_OUTPUT_EXTERNAL. */
2403 assemble_external_real (tree decl
)
2405 rtx rtl
= DECL_RTL (decl
);
2407 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2408 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2409 && !incorporeal_function_p (decl
))
2411 /* Some systems do require some output. */
2412 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2413 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2419 process_pending_assemble_externals (void)
2421 #ifdef ASM_OUTPUT_EXTERNAL
2423 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2424 assemble_external_real (TREE_VALUE (list
));
2426 pending_assemble_externals
= 0;
2427 pending_assemble_externals_processed
= true;
2428 delete pending_assemble_externals_set
;
2432 /* This TREE_LIST contains any weak symbol declarations waiting
2434 static GTY(()) tree weak_decls
;
2436 /* Output something to declare an external symbol to the assembler,
2437 and qualifiers such as weakness. (Most assemblers don't need
2438 extern declaration, so we normally output nothing.) Do nothing if
2439 DECL is not external. */
2442 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2444 /* Make sure that the ASM_OUT_FILE is open.
2445 If it's not, we should not be calling this function. */
2446 gcc_assert (asm_out_file
);
2448 /* In a perfect world, the following condition would be true.
2449 Sadly, the Java and Go front ends emit assembly *from the front end*,
2450 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2452 /* This function should only be called if we are expanding, or have
2454 Ideally, only final.c would be calling this function, but it is
2455 not clear whether that would break things somehow. See PR 17982
2456 for further discussion. */
2457 gcc_assert (state
== EXPANSION
2458 || state
== FINISHED
);
2461 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2464 /* We want to output annotation for weak and external symbols at
2465 very last to check if they are references or not. */
2467 if (TARGET_SUPPORTS_WEAK
2469 /* TREE_STATIC is a weird and abused creature which is not
2470 generally the right test for whether an entity has been
2471 locally emitted, inlined or otherwise not-really-extern, but
2472 for declarations that can be weak, it happens to be
2474 && !TREE_STATIC (decl
)
2475 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2476 && value_member (decl
, weak_decls
) == NULL_TREE
)
2477 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2479 #ifdef ASM_OUTPUT_EXTERNAL
2480 if (pending_assemble_externals_processed
)
2482 assemble_external_real (decl
);
2486 if (! pending_assemble_externals_set
->add (decl
))
2487 pending_assemble_externals
= tree_cons (NULL
, decl
,
2488 pending_assemble_externals
);
2492 /* Similar, for calling a library function FUN. */
2495 assemble_external_libcall (rtx fun
)
2497 /* Declare library function name external when first used, if nec. */
2498 if (! SYMBOL_REF_USED (fun
))
2500 SYMBOL_REF_USED (fun
) = 1;
2501 targetm
.asm_out
.external_libcall (fun
);
2505 /* Assemble a label named NAME. */
2508 assemble_label (FILE *file
, const char *name
)
2510 ASM_OUTPUT_LABEL (file
, name
);
2513 /* Set the symbol_referenced flag for ID. */
2515 mark_referenced (tree id
)
2517 TREE_SYMBOL_REFERENCED (id
) = 1;
2520 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2522 mark_decl_referenced (tree decl
)
2524 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2526 /* Extern inline functions don't become needed when referenced.
2527 If we know a method will be emitted in other TU and no new
2528 functions can be marked reachable, just use the external
2530 struct cgraph_node
*node
= cgraph_node::get_create (decl
);
2531 if (!DECL_EXTERNAL (decl
)
2532 && !node
->definition
)
2533 node
->mark_force_output ();
2535 else if (TREE_CODE (decl
) == VAR_DECL
)
2537 varpool_node
*node
= varpool_node::get_create (decl
);
2538 /* C++ frontend use mark_decl_references to force COMDAT variables
2539 to be output that might appear dead otherwise. */
2540 node
->force_output
= true;
2542 /* else do nothing - we can get various sorts of CST nodes here,
2543 which do not need to be marked. */
2547 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2548 starts with a *, the rest of NAME is output verbatim. Otherwise
2549 NAME is transformed in a target-specific way (usually by the
2550 addition of an underscore). */
2553 assemble_name_raw (FILE *file
, const char *name
)
2556 fputs (&name
[1], file
);
2558 ASM_OUTPUT_LABELREF (file
, name
);
2561 /* Like assemble_name_raw, but should be used when NAME might refer to
2562 an entity that is also represented as a tree (like a function or
2563 variable). If NAME does refer to such an entity, that entity will
2564 be marked as referenced. */
2567 assemble_name (FILE *file
, const char *name
)
2569 const char *real_name
;
2572 real_name
= targetm
.strip_name_encoding (name
);
2574 id
= maybe_get_identifier (real_name
);
2579 mark_referenced (id
);
2580 ultimate_transparent_alias_target (&id
);
2582 name
= IDENTIFIER_POINTER (id
);
2583 gcc_assert (! TREE_CHAIN (id
));
2586 assemble_name_raw (file
, name
);
2589 /* Allocate SIZE bytes writable static space with a gensym name
2590 and return an RTX to refer to its address. */
2593 assemble_static_space (unsigned HOST_WIDE_INT size
)
2596 const char *namestring
;
2599 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2601 namestring
= ggc_strdup (name
);
2603 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2604 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2606 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2607 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2610 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2611 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2614 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2615 so that each uninitialized object starts on such a boundary. */
2616 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2617 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2618 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2619 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2620 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2621 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2628 /* Assemble the static constant template for function entry trampolines.
2629 This is done at most once per compilation.
2630 Returns an RTX for the address of the template. */
2632 static GTY(()) rtx initial_trampoline
;
2635 assemble_trampoline_template (void)
2642 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2644 if (initial_trampoline
)
2645 return initial_trampoline
;
2647 /* By default, put trampoline templates in read-only data section. */
2649 #ifdef TRAMPOLINE_SECTION
2650 switch_to_section (TRAMPOLINE_SECTION
);
2652 switch_to_section (readonly_data_section
);
2655 /* Write the assembler code to define one. */
2656 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2658 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2660 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2661 targetm
.asm_out
.trampoline_template (asm_out_file
);
2663 /* Record the rtl to refer to it. */
2664 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2665 name
= ggc_strdup (label
);
2666 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2667 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2669 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2670 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2671 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2673 return initial_trampoline
;
2676 /* A and B are either alignments or offsets. Return the minimum alignment
2677 that may be assumed after adding the two together. */
2679 static inline unsigned
2680 min_align (unsigned int a
, unsigned int b
)
2682 return (a
| b
) & -(a
| b
);
2685 /* Return the assembler directive for creating a given kind of integer
2686 object. SIZE is the number of bytes in the object and ALIGNED_P
2687 indicates whether it is known to be aligned. Return NULL if the
2688 assembly dialect has no such directive.
2690 The returned string should be printed at the start of a new line and
2691 be followed immediately by the object's initial value. */
2694 integer_asm_op (int size
, int aligned_p
)
2696 struct asm_int_op
*ops
;
2699 ops
= &targetm
.asm_out
.aligned_op
;
2701 ops
= &targetm
.asm_out
.unaligned_op
;
2706 return targetm
.asm_out
.byte_op
;
2720 /* Use directive OP to assemble an integer object X. Print OP at the
2721 start of the line, followed immediately by the value of X. */
2724 assemble_integer_with_op (const char *op
, rtx x
)
2726 fputs (op
, asm_out_file
);
2727 output_addr_const (asm_out_file
, x
);
2728 fputc ('\n', asm_out_file
);
2731 /* The default implementation of the asm_out.integer target hook. */
2734 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2735 unsigned int size ATTRIBUTE_UNUSED
,
2736 int aligned_p ATTRIBUTE_UNUSED
)
2738 const char *op
= integer_asm_op (size
, aligned_p
);
2739 /* Avoid GAS bugs for large values. Specifically negative values whose
2740 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2741 if (size
> (unsigned int) UNITS_PER_WORD
2742 && size
> (unsigned int) POINTER_SIZE_UNITS
)
2744 return op
&& (assemble_integer_with_op (op
, x
), true);
2747 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2748 the alignment of the integer in bits. Return 1 if we were able to output
2749 the constant, otherwise 0. We must be able to output the constant,
2750 if FORCE is nonzero. */
2753 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2757 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2759 /* See if the target hook can handle this kind of object. */
2760 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2763 /* If the object is a multi-byte one, try splitting it up. Split
2764 it into words it if is multi-word, otherwise split it into bytes. */
2767 machine_mode omode
, imode
;
2768 unsigned int subalign
;
2769 unsigned int subsize
, i
;
2770 enum mode_class mclass
;
2772 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2773 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2774 if (GET_CODE (x
) == CONST_FIXED
)
2775 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2779 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2780 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2782 for (i
= 0; i
< size
; i
+= subsize
)
2784 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2785 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2791 /* If we've printed some of it, but not all of it, there's no going
2796 gcc_assert (!force
);
2802 assemble_real (REAL_VALUE_TYPE d
, machine_mode mode
, unsigned int align
)
2804 long data
[4] = {0, 0, 0, 0};
2806 int bitsize
, nelts
, nunits
, units_per
;
2808 /* This is hairy. We have a quantity of known size. real_to_target
2809 will put it into an array of *host* longs, 32 bits per element
2810 (even if long is more than 32 bits). We need to determine the
2811 number of array elements that are occupied (nelts) and the number
2812 of *target* min-addressable units that will be occupied in the
2813 object file (nunits). We cannot assume that 32 divides the
2814 mode's bitsize (size * BITS_PER_UNIT) evenly.
2816 size * BITS_PER_UNIT is used here to make sure that padding bits
2817 (which might appear at either end of the value; real_to_target
2818 will include the padding bits in its output array) are included. */
2820 nunits
= GET_MODE_SIZE (mode
);
2821 bitsize
= nunits
* BITS_PER_UNIT
;
2822 nelts
= CEIL (bitsize
, 32);
2823 units_per
= 32 / BITS_PER_UNIT
;
2825 real_to_target (data
, &d
, mode
);
2827 /* Put out the first word with the specified alignment. */
2828 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2829 nunits
-= units_per
;
2831 /* Subsequent words need only 32-bit alignment. */
2832 align
= min_align (align
, 32);
2834 for (i
= 1; i
< nelts
; i
++)
2836 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2837 nunits
-= units_per
;
2841 /* Given an expression EXP with a constant value,
2842 reduce it to the sum of an assembler symbol and an integer.
2843 Store them both in the structure *VALUE.
2844 EXP must be reducible. */
2848 HOST_WIDE_INT offset
;
2852 decode_addr_const (tree exp
, struct addr_const
*value
)
2854 tree target
= TREE_OPERAND (exp
, 0);
2860 if (TREE_CODE (target
) == COMPONENT_REF
2861 && tree_fits_shwi_p (byte_position (TREE_OPERAND (target
, 1))))
2863 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2864 target
= TREE_OPERAND (target
, 0);
2866 else if (TREE_CODE (target
) == ARRAY_REF
2867 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2869 offset
+= (tree_to_uhwi (TYPE_SIZE_UNIT (TREE_TYPE (target
)))
2870 * tree_to_shwi (TREE_OPERAND (target
, 1)));
2871 target
= TREE_OPERAND (target
, 0);
2873 else if (TREE_CODE (target
) == MEM_REF
2874 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2876 offset
+= mem_ref_offset (target
).to_short_addr ();
2877 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2879 else if (TREE_CODE (target
) == INDIRECT_REF
2880 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2881 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2883 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2888 switch (TREE_CODE (target
))
2892 x
= DECL_RTL (target
);
2896 x
= gen_rtx_MEM (FUNCTION_MODE
,
2897 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2906 x
= output_constant_def (target
, 1);
2913 gcc_assert (MEM_P (x
));
2917 value
->offset
= offset
;
2920 static GTY(()) hash_table
<tree_descriptor_hasher
> *const_desc_htab
;
2922 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2924 /* Constant pool accessor function. */
2926 hash_table
<tree_descriptor_hasher
> *
2927 constant_pool_htab (void)
2929 return const_desc_htab
;
2932 /* Compute a hash code for a constant expression. */
2935 tree_descriptor_hasher::hash (constant_descriptor_tree
*ptr
)
2941 const_hash_1 (const tree exp
)
2946 enum tree_code code
= TREE_CODE (exp
);
2948 /* Either set P and LEN to the address and len of something to hash and
2949 exit the switch or return a value. */
2954 p
= (char *) &TREE_INT_CST_ELT (exp
, 0);
2955 len
= TREE_INT_CST_NUNITS (exp
) * sizeof (HOST_WIDE_INT
);
2959 return real_hash (TREE_REAL_CST_PTR (exp
));
2962 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2965 p
= TREE_STRING_POINTER (exp
);
2966 len
= TREE_STRING_LENGTH (exp
);
2970 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2971 + const_hash_1 (TREE_IMAGPART (exp
)));
2977 hi
= 7 + VECTOR_CST_NELTS (exp
);
2979 for (i
= 0; i
< VECTOR_CST_NELTS (exp
); ++i
)
2980 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ELT (exp
, i
));
2987 unsigned HOST_WIDE_INT idx
;
2990 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2992 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2994 hi
= hi
* 603 + const_hash_1 (value
);
3002 struct addr_const value
;
3004 decode_addr_const (exp
, &value
);
3005 switch (GET_CODE (value
.base
))
3008 /* Don't hash the address of the SYMBOL_REF;
3009 only use the offset and the symbol name. */
3011 p
= XSTR (value
.base
, 0);
3012 for (i
= 0; p
[i
] != 0; i
++)
3013 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3018 + CODE_LABEL_NUMBER (LABEL_REF_LABEL (value
.base
)) * 13);
3028 case POINTER_PLUS_EXPR
:
3030 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
3031 + const_hash_1 (TREE_OPERAND (exp
, 1)));
3034 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
3037 /* A language specific constant. Just hash the code. */
3041 /* Compute hashing function. */
3043 for (i
= 0; i
< len
; i
++)
3044 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3049 /* Wrapper of compare_constant, for the htab interface. */
3051 tree_descriptor_hasher::equal (constant_descriptor_tree
*c1
,
3052 constant_descriptor_tree
*c2
)
3054 if (c1
->hash
!= c2
->hash
)
3056 return compare_constant (c1
->value
, c2
->value
);
3059 /* Compare t1 and t2, and return 1 only if they are known to result in
3060 the same bit pattern on output. */
3063 compare_constant (const tree t1
, const tree t2
)
3065 enum tree_code typecode
;
3067 if (t1
== NULL_TREE
)
3068 return t2
== NULL_TREE
;
3069 if (t2
== NULL_TREE
)
3072 if (TREE_CODE (t1
) != TREE_CODE (t2
))
3075 switch (TREE_CODE (t1
))
3078 /* Integer constants are the same only if the same width of type. */
3079 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3081 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3083 return tree_int_cst_equal (t1
, t2
);
3086 /* Real constants are the same only if the same width of type. */
3087 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3090 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
3093 /* Fixed constants are the same only if the same width of type. */
3094 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3097 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
3100 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3103 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
3104 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
3105 TREE_STRING_LENGTH (t1
)));
3108 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
3109 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
3115 if (VECTOR_CST_NELTS (t1
) != VECTOR_CST_NELTS (t2
))
3118 for (i
= 0; i
< VECTOR_CST_NELTS (t1
); ++i
)
3119 if (!compare_constant (VECTOR_CST_ELT (t1
, i
),
3120 VECTOR_CST_ELT (t2
, i
)))
3128 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
3129 unsigned HOST_WIDE_INT idx
;
3131 typecode
= TREE_CODE (TREE_TYPE (t1
));
3132 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
3135 if (typecode
== ARRAY_TYPE
)
3137 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
3138 /* For arrays, check that the sizes all match. */
3139 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
3141 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
3146 /* For record and union constructors, require exact type
3148 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
3152 v1
= CONSTRUCTOR_ELTS (t1
);
3153 v2
= CONSTRUCTOR_ELTS (t2
);
3154 if (vec_safe_length (v1
) != vec_safe_length (v2
))
3157 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
3159 constructor_elt
*c1
= &(*v1
)[idx
];
3160 constructor_elt
*c2
= &(*v2
)[idx
];
3162 /* Check that each value is the same... */
3163 if (!compare_constant (c1
->value
, c2
->value
))
3165 /* ... and that they apply to the same fields! */
3166 if (typecode
== ARRAY_TYPE
)
3168 if (!compare_constant (c1
->index
, c2
->index
))
3173 if (c1
->index
!= c2
->index
)
3184 struct addr_const value1
, value2
;
3188 decode_addr_const (t1
, &value1
);
3189 decode_addr_const (t2
, &value2
);
3191 if (value1
.offset
!= value2
.offset
)
3194 code
= GET_CODE (value1
.base
);
3195 if (code
!= GET_CODE (value2
.base
))
3201 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3205 ret
= (CODE_LABEL_NUMBER (LABEL_REF_LABEL (value1
.base
))
3206 == CODE_LABEL_NUMBER (LABEL_REF_LABEL (value2
.base
)));
3216 case POINTER_PLUS_EXPR
:
3219 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3220 && compare_constant (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3223 case VIEW_CONVERT_EXPR
:
3224 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3233 /* Return the section into which constant EXP should be placed. */
3236 get_constant_section (tree exp
, unsigned int align
)
3238 return targetm
.asm_out
.select_section (exp
,
3239 compute_reloc_for_constant (exp
),
3243 /* Return the size of constant EXP in bytes. */
3245 static HOST_WIDE_INT
3246 get_constant_size (tree exp
)
3250 size
= int_size_in_bytes (TREE_TYPE (exp
));
3251 if (TREE_CODE (exp
) == STRING_CST
)
3252 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3256 /* Subroutine of output_constant_def:
3257 No constant equal to EXP is known to have been output.
3258 Make a constant descriptor to enter EXP in the hash table.
3259 Assign the label number and construct RTL to refer to the
3260 constant's location in memory.
3261 Caller is responsible for updating the hash table. */
3263 static struct constant_descriptor_tree
*
3264 build_constant_desc (tree exp
)
3266 struct constant_descriptor_tree
*desc
;
3272 desc
= ggc_alloc
<constant_descriptor_tree
> ();
3275 /* Create a string containing the label name, in LABEL. */
3276 labelno
= const_labelno
++;
3277 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3279 /* Construct the VAR_DECL associated with the constant. */
3280 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3282 DECL_ARTIFICIAL (decl
) = 1;
3283 DECL_IGNORED_P (decl
) = 1;
3284 TREE_READONLY (decl
) = 1;
3285 TREE_STATIC (decl
) = 1;
3286 TREE_ADDRESSABLE (decl
) = 1;
3287 /* We don't set the RTL yet as this would cause varpool to assume that the
3288 variable is referenced. Moreover, it would just be dropped in LTO mode.
3289 Instead we set the flag that will be recognized in make_decl_rtl. */
3290 DECL_IN_CONSTANT_POOL (decl
) = 1;
3291 DECL_INITIAL (decl
) = desc
->value
;
3292 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3293 architectures so use DATA_ALIGNMENT as well, except for strings. */
3294 if (TREE_CODE (exp
) == STRING_CST
)
3296 #ifdef CONSTANT_ALIGNMENT
3297 DECL_ALIGN (decl
) = CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
));
3301 align_variable (decl
, 0);
3303 /* Now construct the SYMBOL_REF and the MEM. */
3304 if (use_object_blocks_p ())
3306 int align
= (TREE_CODE (decl
) == CONST_DECL
3307 || (TREE_CODE (decl
) == VAR_DECL
3308 && DECL_IN_CONSTANT_POOL (decl
))
3310 : symtab_node::get (decl
)->definition_alignment ());
3311 section
*sect
= get_constant_section (exp
, align
);
3312 symbol
= create_block_symbol (ggc_strdup (label
),
3313 get_block_for_section (sect
), -1);
3316 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3317 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3318 SET_SYMBOL_REF_DECL (symbol
, decl
);
3319 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3321 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3322 set_mem_attributes (rtl
, exp
, 1);
3323 set_mem_alias_set (rtl
, 0);
3325 /* We cannot share RTX'es in pool entries.
3326 Mark this piece of RTL as required for unsharing. */
3327 RTX_FLAG (rtl
, used
) = 1;
3329 /* Set flags or add text to the name to record information, such as
3330 that it is a local symbol. If the name is changed, the macro
3331 ASM_OUTPUT_LABELREF will have to know how to strip this
3332 information. This call might invalidate our local variable
3333 SYMBOL; we can't use it afterward. */
3334 targetm
.encode_section_info (exp
, rtl
, true);
3341 /* Return an rtx representing a reference to constant data in memory
3342 for the constant expression EXP.
3344 If assembler code for such a constant has already been output,
3345 return an rtx to refer to it.
3346 Otherwise, output such a constant in memory
3347 and generate an rtx for it.
3349 If DEFER is nonzero, this constant can be deferred and output only
3350 if referenced in the function after all optimizations.
3352 `const_desc_table' records which constants already have label strings. */
3355 output_constant_def (tree exp
, int defer
)
3357 struct constant_descriptor_tree
*desc
;
3358 struct constant_descriptor_tree key
;
3360 /* Look up EXP in the table of constant descriptors. If we didn't find
3361 it, create a new one. */
3363 key
.hash
= const_hash_1 (exp
);
3364 constant_descriptor_tree
**loc
3365 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3370 desc
= build_constant_desc (exp
);
3371 desc
->hash
= key
.hash
;
3375 maybe_output_constant_def_contents (desc
, defer
);
3379 /* Subroutine of output_constant_def: Decide whether or not we need to
3380 output the constant DESC now, and if so, do it. */
3382 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3385 rtx symbol
= XEXP (desc
->rtl
, 0);
3386 tree exp
= desc
->value
;
3388 if (flag_syntax_only
)
3391 if (TREE_ASM_WRITTEN (exp
))
3392 /* Already output; don't do it again. */
3395 /* We can always defer constants as long as the context allows
3399 /* Increment n_deferred_constants if it exists. It needs to be at
3400 least as large as the number of constants actually referred to
3401 by the function. If it's too small we'll stop looking too early
3402 and fail to emit constants; if it's too large we'll only look
3403 through the entire function when we could have stopped earlier. */
3405 n_deferred_constants
++;
3409 output_constant_def_contents (symbol
);
3412 /* Subroutine of output_constant_def_contents. Output the definition
3413 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3414 constant's alignment in bits. */
3417 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3421 size
= get_constant_size (exp
);
3423 /* Do any machine/system dependent processing of the constant. */
3424 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3426 /* Output the value of EXP. */
3427 output_constant (exp
, size
, align
);
3429 targetm
.asm_out
.decl_end ();
3432 /* We must output the constant data referred to by SYMBOL; do so. */
3435 output_constant_def_contents (rtx symbol
)
3437 tree decl
= SYMBOL_REF_DECL (symbol
);
3438 tree exp
= DECL_INITIAL (decl
);
3439 bool asan_protected
= false;
3441 /* Make sure any other constants whose addresses appear in EXP
3442 are assigned label numbers. */
3443 output_addressed_constants (exp
);
3445 /* We are no longer deferring this constant. */
3446 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3448 if ((flag_sanitize
& SANITIZE_ADDRESS
)
3449 && TREE_CODE (exp
) == STRING_CST
3450 && asan_protect_global (exp
))
3452 asan_protected
= true;
3453 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
3454 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
3457 /* If the constant is part of an object block, make sure that the
3458 decl has been positioned within its block, but do not write out
3459 its definition yet. output_object_blocks will do that later. */
3460 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3461 place_block_symbol (symbol
);
3464 int align
= (TREE_CODE (decl
) == CONST_DECL
3465 || (TREE_CODE (decl
) == VAR_DECL
3466 && DECL_IN_CONSTANT_POOL (decl
))
3468 : symtab_node::get (decl
)->definition_alignment ());
3469 switch_to_section (get_constant_section (exp
, align
));
3470 if (align
> BITS_PER_UNIT
)
3471 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3472 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3475 HOST_WIDE_INT size
= get_constant_size (exp
);
3476 assemble_zeros (asan_red_zone_size (size
));
3481 /* Look up EXP in the table of constant descriptors. Return the rtl
3482 if it has been emitted, else null. */
3485 lookup_constant_def (tree exp
)
3487 struct constant_descriptor_tree key
;
3490 key
.hash
= const_hash_1 (exp
);
3491 constant_descriptor_tree
*desc
3492 = const_desc_htab
->find_with_hash (&key
, key
.hash
);
3494 return (desc
? desc
->rtl
: NULL_RTX
);
3497 /* Return a tree representing a reference to constant data in memory
3498 for the constant expression EXP.
3500 This is the counterpart of output_constant_def at the Tree level. */
3503 tree_output_constant_def (tree exp
)
3505 struct constant_descriptor_tree
*desc
, key
;
3508 /* Look up EXP in the table of constant descriptors. If we didn't find
3509 it, create a new one. */
3511 key
.hash
= const_hash_1 (exp
);
3512 constant_descriptor_tree
**loc
3513 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3518 desc
= build_constant_desc (exp
);
3519 desc
->hash
= key
.hash
;
3523 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3524 varpool_node::finalize_decl (decl
);
3528 struct GTY((chain_next ("%h.next"), for_user
)) constant_descriptor_rtx
{
3529 struct constant_descriptor_rtx
*next
;
3533 HOST_WIDE_INT offset
;
3541 struct const_rtx_desc_hasher
: ggc_ptr_hash
<constant_descriptor_rtx
>
3543 static hashval_t
hash (constant_descriptor_rtx
*);
3544 static bool equal (constant_descriptor_rtx
*, constant_descriptor_rtx
*);
3547 /* Used in the hash tables to avoid outputting the same constant
3548 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3549 are output once per function, not once per file. */
3550 /* ??? Only a few targets need per-function constant pools. Most
3551 can use one per-file pool. Should add a targetm bit to tell the
3554 struct GTY(()) rtx_constant_pool
{
3555 /* Pointers to first and last constant in pool, as ordered by offset. */
3556 struct constant_descriptor_rtx
*first
;
3557 struct constant_descriptor_rtx
*last
;
3559 /* Hash facility for making memory-constants from constant rtl-expressions.
3560 It is used on RISC machines where immediate integer arguments and
3561 constant addresses are restricted so that such constants must be stored
3563 hash_table
<const_rtx_desc_hasher
> *const_rtx_htab
;
3565 /* Current offset in constant pool (does not include any
3566 machine-specific header). */
3567 HOST_WIDE_INT offset
;
3570 /* Hash and compare functions for const_rtx_htab. */
3573 const_rtx_desc_hasher::hash (constant_descriptor_rtx
*desc
)
3579 const_rtx_desc_hasher::equal (constant_descriptor_rtx
*x
,
3580 constant_descriptor_rtx
*y
)
3582 if (x
->mode
!= y
->mode
)
3584 return rtx_equal_p (x
->constant
, y
->constant
);
3587 /* Hash one component of a constant. */
3590 const_rtx_hash_1 (const_rtx x
)
3592 unsigned HOST_WIDE_INT hwi
;
3598 code
= GET_CODE (x
);
3599 mode
= GET_MODE (x
);
3600 h
= (hashval_t
) code
* 1048573 + mode
;
3609 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3610 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3612 h
^= (hashval_t
) hwi
;
3613 for (i
= 1; i
< n
; ++i
)
3616 h
^= (hashval_t
) hwi
;
3621 case CONST_WIDE_INT
:
3622 hwi
= GET_MODE_PRECISION (mode
);
3624 for (i
= 0; i
< CONST_WIDE_INT_NUNITS (x
); i
++)
3625 hwi
^= CONST_WIDE_INT_ELT (x
, i
);
3630 if (TARGET_SUPPORTS_WIDE_INT
== 0 && mode
== VOIDmode
)
3632 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3636 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3640 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3644 h
^= htab_hash_string (XSTR (x
, 0));
3648 h
= h
* 251 + CODE_LABEL_NUMBER (LABEL_REF_LABEL (x
));
3652 case UNSPEC_VOLATILE
:
3653 h
= h
* 251 + XINT (x
, 1);
3663 /* Compute a hash value for X, which should be a constant. */
3666 const_rtx_hash (rtx x
)
3669 subrtx_iterator::array_type array
;
3670 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
3671 h
= h
* 509 + const_rtx_hash_1 (*iter
);
3676 /* Create and return a new rtx constant pool. */
3678 static struct rtx_constant_pool
*
3679 create_constant_pool (void)
3681 struct rtx_constant_pool
*pool
;
3683 pool
= ggc_alloc
<rtx_constant_pool
> ();
3684 pool
->const_rtx_htab
= hash_table
<const_rtx_desc_hasher
>::create_ggc (31);
3691 /* Initialize constant pool hashing for a new function. */
3694 init_varasm_status (void)
3696 crtl
->varasm
.pool
= create_constant_pool ();
3697 crtl
->varasm
.deferred_constants
= 0;
3700 /* Given a MINUS expression, simplify it if both sides
3701 include the same symbol. */
3704 simplify_subtraction (rtx x
)
3706 rtx r
= simplify_rtx (x
);
3710 /* Given a constant rtx X, make (or find) a memory constant for its value
3711 and return a MEM rtx to refer to it in memory. */
3714 force_const_mem (machine_mode mode
, rtx x
)
3716 struct constant_descriptor_rtx
*desc
, tmp
;
3717 struct rtx_constant_pool
*pool
;
3722 constant_descriptor_rtx
**slot
;
3724 /* If we're not allowed to drop X into the constant pool, don't. */
3725 if (targetm
.cannot_force_const_mem (mode
, x
))
3728 /* Record that this function has used a constant pool entry. */
3729 crtl
->uses_const_pool
= 1;
3731 /* Decide which pool to use. */
3732 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3733 ? shared_constant_pool
3734 : crtl
->varasm
.pool
);
3736 /* Lookup the value in the hashtable. */
3739 hash
= const_rtx_hash (x
);
3740 slot
= pool
->const_rtx_htab
->find_slot_with_hash (&tmp
, hash
, INSERT
);
3743 /* If the constant was already present, return its memory. */
3745 return copy_rtx (desc
->mem
);
3747 /* Otherwise, create a new descriptor. */
3748 desc
= ggc_alloc
<constant_descriptor_rtx
> ();
3751 /* Align the location counter as required by EXP's data type. */
3752 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3753 #ifdef CONSTANT_ALIGNMENT
3755 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3756 if (type
!= NULL_TREE
)
3757 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3761 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3762 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3765 desc
->constant
= copy_rtx (tmp
.constant
);
3766 desc
->offset
= pool
->offset
;
3769 desc
->align
= align
;
3770 desc
->labelno
= const_labelno
;
3773 pool
->offset
+= GET_MODE_SIZE (mode
);
3775 pool
->last
->next
= desc
;
3777 pool
->first
= pool
->last
= desc
;
3780 /* Create a string containing the label name, in LABEL. */
3781 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3784 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3785 the constants pool. */
3786 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3788 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3789 symbol
= create_block_symbol (ggc_strdup (label
),
3790 get_block_for_section (sect
), -1);
3793 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3795 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3796 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3797 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3799 /* Construct the MEM. */
3800 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3801 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3802 set_mem_align (def
, align
);
3804 /* If we're dropping a label to the constant pool, make sure we
3806 if (GET_CODE (x
) == LABEL_REF
)
3807 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3809 return copy_rtx (def
);
3812 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3815 get_pool_constant (const_rtx addr
)
3817 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3820 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3821 and whether it has been output or not. */
3824 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3826 struct constant_descriptor_rtx
*desc
;
3828 desc
= SYMBOL_REF_CONSTANT (addr
);
3829 *pmarked
= (desc
->mark
!= 0);
3830 return desc
->constant
;
3833 /* Similar, return the mode. */
3836 get_pool_mode (const_rtx addr
)
3838 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3841 /* Return the size of the constant pool. */
3844 get_pool_size (void)
3846 return crtl
->varasm
.pool
->offset
;
3849 /* Worker function for output_constant_pool_1. Emit assembly for X
3850 in MODE with known alignment ALIGN. */
3853 output_constant_pool_2 (machine_mode mode
, rtx x
, unsigned int align
)
3855 switch (GET_MODE_CLASS (mode
))
3858 case MODE_DECIMAL_FLOAT
:
3862 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3863 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3864 assemble_real (r
, mode
, align
);
3869 case MODE_PARTIAL_INT
:
3874 case MODE_POINTER_BOUNDS
:
3875 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3878 case MODE_VECTOR_FLOAT
:
3879 case MODE_VECTOR_INT
:
3880 case MODE_VECTOR_FRACT
:
3881 case MODE_VECTOR_UFRACT
:
3882 case MODE_VECTOR_ACCUM
:
3883 case MODE_VECTOR_UACCUM
:
3886 machine_mode submode
= GET_MODE_INNER (mode
);
3887 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3889 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3890 units
= CONST_VECTOR_NUNITS (x
);
3892 for (i
= 0; i
< units
; i
++)
3894 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3895 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3905 /* Worker function for output_constant_pool. Emit constant DESC,
3906 giving it ALIGN bits of alignment. */
3909 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3916 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3917 whose CODE_LABEL has been deleted. This can occur if a jump table
3918 is eliminated by optimization. If so, write a constant of zero
3919 instead. Note that this can also happen by turning the
3920 CODE_LABEL into a NOTE. */
3921 /* ??? This seems completely and utterly wrong. Certainly it's
3922 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3923 functioning even with rtx_insn::deleted and friends. */
3926 switch (GET_CODE (tmp
))
3929 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3930 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3932 tmp
= XEXP (XEXP (tmp
, 0), 0);
3936 tmp
= LABEL_REF_LABEL (tmp
);
3937 gcc_assert (!as_a
<rtx_insn
*> (tmp
)->deleted ());
3938 gcc_assert (!NOTE_P (tmp
)
3939 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3946 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3947 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3948 align
, desc
->labelno
, done
);
3951 assemble_align (align
);
3953 /* Output the label. */
3954 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3957 Pass actual alignment value while emitting string constant to asm code
3958 as function 'output_constant_pool_1' explicitly passes the alignment as 1
3959 assuming that the data is already aligned which prevents the generation
3960 of fix-up table entries. */
3961 output_constant_pool_2 (desc
->mode
, x
, desc
->align
);
3963 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3964 sections have proper size. */
3965 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3967 && (in_section
->common
.flags
& SECTION_MERGE
))
3968 assemble_align (align
);
3970 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3976 /* Mark all constants that are referenced by SYMBOL_REFs in X.
3977 Emit referenced deferred strings. */
3980 mark_constants_in_pattern (rtx insn
)
3982 subrtx_iterator::array_type array
;
3983 FOR_EACH_SUBRTX (iter
, array
, PATTERN (insn
), ALL
)
3985 const_rtx x
= *iter
;
3986 if (GET_CODE (x
) == SYMBOL_REF
)
3988 if (CONSTANT_POOL_ADDRESS_P (x
))
3990 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3991 if (desc
->mark
== 0)
3994 iter
.substitute (desc
->constant
);
3997 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3999 tree decl
= SYMBOL_REF_DECL (x
);
4000 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
4002 n_deferred_constants
--;
4003 output_constant_def_contents (CONST_CAST_RTX (x
));
4010 /* Look through appropriate parts of INSN, marking all entries in the
4011 constant pool which are actually being used. Entries that are only
4012 referenced by other constants are also marked as used. Emit
4013 deferred strings that are used. */
4016 mark_constants (rtx_insn
*insn
)
4021 /* Insns may appear inside a SEQUENCE. Only check the patterns of
4022 insns, not any notes that may be attached. We don't want to mark
4023 a constant just because it happens to appear in a REG_EQUIV note. */
4024 if (rtx_sequence
*seq
= dyn_cast
<rtx_sequence
*> (PATTERN (insn
)))
4026 int i
, n
= seq
->len ();
4027 for (i
= 0; i
< n
; ++i
)
4029 rtx subinsn
= seq
->element (i
);
4030 if (INSN_P (subinsn
))
4031 mark_constants_in_pattern (subinsn
);
4035 mark_constants_in_pattern (insn
);
4038 /* Look through the instructions for this function, and mark all the
4039 entries in POOL which are actually being used. Emit deferred constants
4040 which have indeed been used. */
4043 mark_constant_pool (void)
4047 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
4050 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
4051 mark_constants (insn
);
4054 /* Write all the constants in POOL. */
4057 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
4059 struct constant_descriptor_rtx
*desc
;
4061 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
4064 /* If the constant is part of an object_block, make sure that
4065 the constant has been positioned within its block, but do not
4066 write out its definition yet. output_object_blocks will do
4068 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
4069 && SYMBOL_REF_BLOCK (desc
->sym
))
4070 place_block_symbol (desc
->sym
);
4073 switch_to_section (targetm
.asm_out
.select_rtx_section
4074 (desc
->mode
, desc
->constant
, desc
->align
));
4075 output_constant_pool_1 (desc
, desc
->align
);
4080 /* Mark all constants that are used in the current function, then write
4081 out the function's private constant pool. */
4084 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
4085 tree fndecl ATTRIBUTE_UNUSED
)
4087 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
4089 /* It is possible for gcc to call force_const_mem and then to later
4090 discard the instructions which refer to the constant. In such a
4091 case we do not need to output the constant. */
4092 mark_constant_pool ();
4094 #ifdef ASM_OUTPUT_POOL_PROLOGUE
4095 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4098 output_constant_pool_contents (pool
);
4100 #ifdef ASM_OUTPUT_POOL_EPILOGUE
4101 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4105 /* Write the contents of the shared constant pool. */
4108 output_shared_constant_pool (void)
4110 output_constant_pool_contents (shared_constant_pool
);
4113 /* Determine what kind of relocations EXP may need. */
4116 compute_reloc_for_constant (tree exp
)
4118 int reloc
= 0, reloc2
;
4121 switch (TREE_CODE (exp
))
4125 /* Go inside any operations that get_inner_reference can handle and see
4126 if what's inside is a constant: no need to do anything here for
4127 addresses of variables or functions. */
4128 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4129 tem
= TREE_OPERAND (tem
, 0))
4132 if (TREE_CODE (tem
) == MEM_REF
4133 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
4135 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
4139 if (!targetm
.binds_local_p (tem
))
4146 case POINTER_PLUS_EXPR
:
4147 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4148 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4152 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4153 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4154 /* The difference of two local labels is computable at link time. */
4155 if (reloc
== 1 && reloc2
== 1)
4162 case VIEW_CONVERT_EXPR
:
4163 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4168 unsigned HOST_WIDE_INT idx
;
4169 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4171 reloc
|= compute_reloc_for_constant (tem
);
4181 /* Find all the constants whose addresses are referenced inside of EXP,
4182 and make sure assembler code with a label has been output for each one.
4183 Indicate whether an ADDR_EXPR has been encountered. */
4186 output_addressed_constants (tree exp
)
4190 switch (TREE_CODE (exp
))
4194 /* Go inside any operations that get_inner_reference can handle and see
4195 if what's inside is a constant: no need to do anything here for
4196 addresses of variables or functions. */
4197 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4198 tem
= TREE_OPERAND (tem
, 0))
4201 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4202 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4203 tem
= DECL_INITIAL (tem
);
4205 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4206 output_constant_def (tem
, 0);
4208 if (TREE_CODE (tem
) == MEM_REF
)
4209 output_addressed_constants (TREE_OPERAND (tem
, 0));
4213 case POINTER_PLUS_EXPR
:
4215 output_addressed_constants (TREE_OPERAND (exp
, 1));
4219 case VIEW_CONVERT_EXPR
:
4220 output_addressed_constants (TREE_OPERAND (exp
, 0));
4225 unsigned HOST_WIDE_INT idx
;
4226 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4228 output_addressed_constants (tem
);
4237 /* Whether a constructor CTOR is a valid static constant initializer if all
4238 its elements are. This used to be internal to initializer_constant_valid_p
4239 and has been exposed to let other functions like categorize_ctor_elements
4240 evaluate the property while walking a constructor for other purposes. */
4243 constructor_static_from_elts_p (const_tree ctor
)
4245 return (TREE_CONSTANT (ctor
)
4246 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4247 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4248 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4251 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4254 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4255 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4256 which are valid when ENDTYPE is an integer of any size; in
4257 particular, this does not accept a pointer minus a constant. This
4258 returns null_pointer_node if the VALUE is an absolute constant
4259 which can be used to initialize a static variable. Otherwise it
4263 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4267 if (!INTEGRAL_TYPE_P (endtype
))
4270 op0
= TREE_OPERAND (value
, 0);
4271 op1
= TREE_OPERAND (value
, 1);
4273 /* Like STRIP_NOPS except allow the operand mode to widen. This
4274 works around a feature of fold that simplifies (int)(p1 - p2) to
4275 ((int)p1 - (int)p2) under the theory that the narrower operation
4278 while (CONVERT_EXPR_P (op0
)
4279 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4281 tree inner
= TREE_OPERAND (op0
, 0);
4282 if (inner
== error_mark_node
4283 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4284 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4285 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4290 while (CONVERT_EXPR_P (op1
)
4291 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4293 tree inner
= TREE_OPERAND (op1
, 0);
4294 if (inner
== error_mark_node
4295 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4296 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4297 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4302 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4306 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4307 cache
? cache
+ 2 : NULL
);
4308 /* Both initializers must be known. */
4312 && (op0
== null_pointer_node
4313 || TREE_CODE (value
) == MINUS_EXPR
))
4314 return null_pointer_node
;
4316 /* Support differences between labels. */
4317 if (TREE_CODE (op0
) == LABEL_DECL
4318 && TREE_CODE (op1
) == LABEL_DECL
)
4319 return null_pointer_node
;
4321 if (TREE_CODE (op0
) == STRING_CST
4322 && TREE_CODE (op1
) == STRING_CST
4323 && operand_equal_p (op0
, op1
, 1))
4324 return null_pointer_node
;
4330 /* Helper function of initializer_constant_valid_p.
4331 Return nonzero if VALUE is a valid constant-valued expression
4332 for use in initializing a static variable; one that can be an
4333 element of a "constant" initializer.
4335 Return null_pointer_node if the value is absolute;
4336 if it is relocatable, return the variable that determines the relocation.
4337 We assume that VALUE has been folded as much as possible;
4338 therefore, we do not need to check for such things as
4339 arithmetic-combinations of integers.
4341 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4344 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4348 switch (TREE_CODE (value
))
4351 if (constructor_static_from_elts_p (value
))
4353 unsigned HOST_WIDE_INT idx
;
4355 bool absolute
= true;
4357 if (cache
&& cache
[0] == value
)
4359 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4362 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4369 cache
[1] = NULL_TREE
;
4373 if (reloc
!= null_pointer_node
)
4376 /* For a non-absolute relocation, there is no single
4377 variable that can be "the variable that determines the
4382 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4384 return absolute
? null_pointer_node
: error_mark_node
;
4387 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4395 return null_pointer_node
;
4400 tree op0
= staticp (TREE_OPERAND (value
, 0));
4403 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4404 to be a constant, this is old-skool offsetof-like nonsense. */
4405 if (TREE_CODE (op0
) == INDIRECT_REF
4406 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4407 return null_pointer_node
;
4408 /* Taking the address of a nested function involves a trampoline,
4409 unless we don't need or want one. */
4410 if (TREE_CODE (op0
) == FUNCTION_DECL
4411 && DECL_STATIC_CHAIN (op0
)
4412 && !TREE_NO_TRAMPOLINE (value
))
4414 /* "&{...}" requires a temporary to hold the constructed
4416 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4422 case NON_LVALUE_EXPR
:
4423 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4426 case VIEW_CONVERT_EXPR
:
4428 tree src
= TREE_OPERAND (value
, 0);
4429 tree src_type
= TREE_TYPE (src
);
4430 tree dest_type
= TREE_TYPE (value
);
4432 /* Allow view-conversions from aggregate to non-aggregate type only
4433 if the bit pattern is fully preserved afterwards; otherwise, the
4434 RTL expander won't be able to apply a subsequent transformation
4435 to the underlying constructor. */
4436 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4438 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4439 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4444 /* Allow all other kinds of view-conversion. */
4445 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4450 tree src
= TREE_OPERAND (value
, 0);
4451 tree src_type
= TREE_TYPE (src
);
4452 tree dest_type
= TREE_TYPE (value
);
4454 /* Allow conversions between pointer types, floating-point
4455 types, and offset types. */
4456 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4457 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4458 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4459 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4460 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4462 /* Allow length-preserving conversions between integer types. */
4463 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4464 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4465 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4467 /* Allow conversions between other integer types only if
4469 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4471 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4472 if (inner
== null_pointer_node
)
4473 return null_pointer_node
;
4477 /* Allow (int) &foo provided int is as wide as a pointer. */
4478 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4479 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4480 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4482 /* Likewise conversions from int to pointers, but also allow
4483 conversions from 0. */
4484 if ((POINTER_TYPE_P (dest_type
)
4485 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4486 && INTEGRAL_TYPE_P (src_type
))
4488 if (TREE_CODE (src
) == INTEGER_CST
4489 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4490 return null_pointer_node
;
4491 if (integer_zerop (src
))
4492 return null_pointer_node
;
4493 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4494 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4497 /* Allow conversions to struct or union types if the value
4499 if (TREE_CODE (dest_type
) == RECORD_TYPE
4500 || TREE_CODE (dest_type
) == UNION_TYPE
)
4501 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4505 case POINTER_PLUS_EXPR
:
4507 /* Any valid floating-point constants will have been folded by now;
4508 with -frounding-math we hit this with addition of two constants. */
4509 if (TREE_CODE (endtype
) == REAL_TYPE
)
4511 if (cache
&& cache
[0] == value
)
4513 if (! INTEGRAL_TYPE_P (endtype
)
4514 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4516 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4518 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4521 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4522 endtype
, ncache
+ 2);
4523 /* If either term is absolute, use the other term's relocation. */
4524 if (valid0
== null_pointer_node
)
4526 else if (valid1
== null_pointer_node
)
4528 /* Support narrowing pointer differences. */
4530 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4534 /* Support narrowing pointer differences. */
4535 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4544 if (TREE_CODE (endtype
) == REAL_TYPE
)
4546 if (cache
&& cache
[0] == value
)
4548 if (! INTEGRAL_TYPE_P (endtype
)
4549 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4551 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4553 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4556 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4557 endtype
, ncache
+ 2);
4558 /* Win if second argument is absolute. */
4559 if (valid1
== null_pointer_node
)
4561 /* Win if both arguments have the same relocation.
4562 Then the value is absolute. */
4563 else if (valid0
== valid1
&& valid0
!= 0)
4564 ret
= null_pointer_node
;
4565 /* Since GCC guarantees that string constants are unique in the
4566 generated code, a subtraction between two copies of the same
4567 constant string is absolute. */
4568 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4569 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4570 && operand_equal_p (valid0
, valid1
, 1))
4571 ret
= null_pointer_node
;
4572 /* Support narrowing differences. */
4574 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4578 /* Support narrowing differences. */
4579 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4594 /* Return nonzero if VALUE is a valid constant-valued expression
4595 for use in initializing a static variable; one that can be an
4596 element of a "constant" initializer.
4598 Return null_pointer_node if the value is absolute;
4599 if it is relocatable, return the variable that determines the relocation.
4600 We assume that VALUE has been folded as much as possible;
4601 therefore, we do not need to check for such things as
4602 arithmetic-combinations of integers. */
4604 initializer_constant_valid_p (tree value
, tree endtype
)
4606 return initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4609 /* Return true if VALUE is a valid constant-valued expression
4610 for use in initializing a static bit-field; one that can be
4611 an element of a "constant" initializer. */
4614 initializer_constant_valid_for_bitfield_p (tree value
)
4616 /* For bitfields we support integer constants or possibly nested aggregates
4618 switch (TREE_CODE (value
))
4622 unsigned HOST_WIDE_INT idx
;
4625 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4626 if (!initializer_constant_valid_for_bitfield_p (elt
))
4635 case VIEW_CONVERT_EXPR
:
4636 case NON_LVALUE_EXPR
:
4638 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4647 /* output_constructor outer state of relevance in recursive calls, typically
4648 for nested aggregate bitfields. */
4651 unsigned int bit_offset
; /* current position in ... */
4652 int byte
; /* ... the outer byte buffer. */
4655 static unsigned HOST_WIDE_INT
4656 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int,
4659 /* Output assembler code for constant EXP, with no label.
4660 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4661 Assumes output_addressed_constants has been done on EXP already.
4663 Generate at least SIZE bytes of assembler data, padding at the end
4664 with zeros if necessary. SIZE must always be specified. The returned
4665 value is the actual number of bytes of assembler data generated, which
4666 may be bigger than SIZE if the object contains a variable length field.
4668 SIZE is important for structure constructors,
4669 since trailing members may have been omitted from the constructor.
4670 It is also important for initialization of arrays from string constants
4671 since the full length of the string constant might not be wanted.
4672 It is also needed for initialization of unions, where the initializer's
4673 type is just one member, and that may not be as long as the union.
4675 There a case in which we would fail to output exactly SIZE bytes:
4676 for a structure constructor that wants to produce more than SIZE bytes.
4677 But such constructors will never be generated for any possible input.
4679 ALIGN is the alignment of the data in bits. */
4681 static unsigned HOST_WIDE_INT
4682 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4684 enum tree_code code
;
4685 unsigned HOST_WIDE_INT thissize
;
4687 if (size
== 0 || flag_syntax_only
)
4690 /* See if we're trying to initialize a pointer in a non-default mode
4691 to the address of some declaration somewhere. If the target says
4692 the mode is valid for pointers, assume the target has a way of
4694 if (TREE_CODE (exp
) == NOP_EXPR
4695 && POINTER_TYPE_P (TREE_TYPE (exp
))
4696 && targetm
.addr_space
.valid_pointer_mode
4697 (TYPE_MODE (TREE_TYPE (exp
)),
4698 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4700 tree saved_type
= TREE_TYPE (exp
);
4702 /* Peel off any intermediate conversions-to-pointer for valid
4704 while (TREE_CODE (exp
) == NOP_EXPR
4705 && POINTER_TYPE_P (TREE_TYPE (exp
))
4706 && targetm
.addr_space
.valid_pointer_mode
4707 (TYPE_MODE (TREE_TYPE (exp
)),
4708 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4709 exp
= TREE_OPERAND (exp
, 0);
4711 /* If what we're left with is the address of something, we can
4712 convert the address to the final type and output it that
4714 if (TREE_CODE (exp
) == ADDR_EXPR
)
4715 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4716 /* Likewise for constant ints. */
4717 else if (TREE_CODE (exp
) == INTEGER_CST
)
4718 exp
= wide_int_to_tree (saved_type
, exp
);
4722 /* Eliminate any conversions since we'll be outputting the underlying
4724 while (CONVERT_EXPR_P (exp
)
4725 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4726 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4728 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4729 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4731 /* Make sure eliminating the conversion is really a no-op, except with
4732 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4733 union types to allow for Ada unchecked unions. */
4734 if (type_size
> op_size
4735 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4736 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4737 /* Keep the conversion. */
4740 exp
= TREE_OPERAND (exp
, 0);
4743 code
= TREE_CODE (TREE_TYPE (exp
));
4744 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4746 /* Allow a constructor with no elements for any data type.
4747 This means to fill the space with zeros. */
4748 if (TREE_CODE (exp
) == CONSTRUCTOR
4749 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4751 assemble_zeros (size
);
4755 if (TREE_CODE (exp
) == FDESC_EXPR
)
4757 #ifdef ASM_OUTPUT_FDESC
4758 HOST_WIDE_INT part
= tree_to_shwi (TREE_OPERAND (exp
, 1));
4759 tree decl
= TREE_OPERAND (exp
, 0);
4760 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4767 /* Now output the underlying data. If we've handling the padding, return.
4768 Otherwise, break and ensure SIZE is the size written. */
4775 case REFERENCE_TYPE
:
4777 case FIXED_POINT_TYPE
:
4778 case POINTER_BOUNDS_TYPE
:
4780 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4781 EXPAND_INITIALIZER
),
4782 MIN (size
, thissize
), align
, 0))
4783 error ("initializer for integer/fixed-point value is too complicated");
4787 if (TREE_CODE (exp
) != REAL_CST
)
4788 error ("initializer for floating value is not a floating constant");
4790 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4794 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4795 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4796 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4801 switch (TREE_CODE (exp
))
4804 return output_constructor (exp
, size
, align
, NULL
);
4807 = MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
), size
);
4808 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4812 machine_mode inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4813 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4814 int elt_size
= GET_MODE_SIZE (inner
);
4815 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
);
4816 thissize
= elt_size
;
4817 for (unsigned int i
= 1; i
< VECTOR_CST_NELTS (exp
); i
++)
4819 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
);
4820 thissize
+= elt_size
;
4831 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4832 return output_constructor (exp
, size
, align
, NULL
);
4841 if (size
> thissize
)
4842 assemble_zeros (size
- thissize
);
4848 /* Subroutine of output_constructor, used for computing the size of
4849 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4850 type with an unspecified upper bound. */
4852 static unsigned HOST_WIDE_INT
4853 array_size_for_constructor (tree val
)
4856 unsigned HOST_WIDE_INT cnt
;
4857 tree index
, value
, tmp
;
4860 /* This code used to attempt to handle string constants that are not
4861 arrays of single-bytes, but nothing else does, so there's no point in
4863 if (TREE_CODE (val
) == STRING_CST
)
4864 return TREE_STRING_LENGTH (val
);
4866 max_index
= NULL_TREE
;
4867 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4869 if (TREE_CODE (index
) == RANGE_EXPR
)
4870 index
= TREE_OPERAND (index
, 1);
4871 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4875 if (max_index
== NULL_TREE
)
4878 /* Compute the total number of array elements. */
4879 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4880 i
= wi::to_offset (max_index
) - wi::to_offset (tmp
) + 1;
4882 /* Multiply by the array element unit size to find number of bytes. */
4883 i
*= wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4885 gcc_assert (wi::fits_uhwi_p (i
));
4886 return i
.to_uhwi ();
4889 /* Other datastructures + helpers for output_constructor. */
4891 /* output_constructor local state to support interaction with helpers. */
4895 /* Received arguments. */
4896 tree exp
; /* Constructor expression. */
4897 tree type
; /* Type of constructor expression. */
4898 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4899 unsigned int align
; /* Known initial alignment. */
4900 tree min_index
; /* Lower bound if specified for an array. */
4902 /* Output processing state. */
4903 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4904 int byte
; /* Part of a bitfield byte yet to be output. */
4905 int last_relative_index
; /* Implicit or explicit index of the last
4906 array element output within a bitfield. */
4907 bool byte_buffer_in_use
; /* Whether BYTE is in use. */
4909 /* Current element. */
4910 tree field
; /* Current field decl in a record. */
4911 tree val
; /* Current element value. */
4912 tree index
; /* Current element index. */
4916 /* Helper for output_constructor. From the current LOCAL state, output a
4917 RANGE_EXPR element. */
4920 output_constructor_array_range (oc_local_state
*local
)
4922 unsigned HOST_WIDE_INT fieldsize
4923 = int_size_in_bytes (TREE_TYPE (local
->type
));
4925 HOST_WIDE_INT lo_index
4926 = tree_to_shwi (TREE_OPERAND (local
->index
, 0));
4927 HOST_WIDE_INT hi_index
4928 = tree_to_shwi (TREE_OPERAND (local
->index
, 1));
4929 HOST_WIDE_INT index
;
4932 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4934 for (index
= lo_index
; index
<= hi_index
; index
++)
4936 /* Output the element's initial value. */
4937 if (local
->val
== NULL_TREE
)
4938 assemble_zeros (fieldsize
);
4940 fieldsize
= output_constant (local
->val
, fieldsize
, align2
);
4942 /* Count its size. */
4943 local
->total_bytes
+= fieldsize
;
4947 /* Helper for output_constructor. From the current LOCAL state, output a
4948 field element that is not true bitfield or part of an outer one. */
4951 output_constructor_regular_field (oc_local_state
*local
)
4953 /* Field size and position. Since this structure is static, we know the
4954 positions are constant. */
4955 unsigned HOST_WIDE_INT fieldsize
;
4956 HOST_WIDE_INT fieldpos
;
4958 unsigned int align2
;
4960 if (local
->index
!= NULL_TREE
)
4962 /* Perform the index calculation in modulo arithmetic but
4963 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4964 but we are using an unsigned sizetype. */
4965 unsigned prec
= TYPE_PRECISION (sizetype
);
4966 offset_int idx
= wi::sext (wi::to_offset (local
->index
)
4967 - wi::to_offset (local
->min_index
), prec
);
4968 fieldpos
= (idx
* wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
))))
4971 else if (local
->field
!= NULL_TREE
)
4972 fieldpos
= int_byte_position (local
->field
);
4976 /* Output any buffered-up bit-fields preceding this element. */
4977 if (local
->byte_buffer_in_use
)
4979 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4980 local
->total_bytes
++;
4981 local
->byte_buffer_in_use
= false;
4984 /* Advance to offset of this element.
4985 Note no alignment needed in an array, since that is guaranteed
4986 if each element has the proper size. */
4987 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4988 && fieldpos
> local
->total_bytes
)
4990 assemble_zeros (fieldpos
- local
->total_bytes
);
4991 local
->total_bytes
= fieldpos
;
4994 /* Find the alignment of this element. */
4995 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
4997 /* Determine size this element should occupy. */
5002 /* If this is an array with an unspecified upper bound,
5003 the initializer determines the size. */
5004 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
5005 but we cannot do this until the deprecated support for
5006 initializing zero-length array members is removed. */
5007 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
5008 && TYPE_DOMAIN (TREE_TYPE (local
->field
))
5009 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
))))
5011 fieldsize
= array_size_for_constructor (local
->val
);
5012 /* Given a non-empty initialization, this field had
5014 gcc_assert (!fieldsize
|| !DECL_CHAIN (local
->field
));
5017 fieldsize
= tree_to_uhwi (DECL_SIZE_UNIT (local
->field
));
5020 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
5022 /* Output the element's initial value. */
5023 if (local
->val
== NULL_TREE
)
5024 assemble_zeros (fieldsize
);
5026 fieldsize
= output_constant (local
->val
, fieldsize
, align2
);
5028 /* Count its size. */
5029 local
->total_bytes
+= fieldsize
;
5032 /* Helper for output_constructor. From the LOCAL state, output an element
5033 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
5034 from the start of a possibly ongoing outer byte buffer. */
5037 output_constructor_bitfield (oc_local_state
*local
, unsigned int bit_offset
)
5039 /* Bit size of this element. */
5040 HOST_WIDE_INT ebitsize
5042 ? tree_to_uhwi (DECL_SIZE (local
->field
))
5043 : tree_to_uhwi (TYPE_SIZE (TREE_TYPE (local
->type
))));
5045 /* Relative index of this element if this is an array component. */
5046 HOST_WIDE_INT relative_index
5049 ? (tree_to_shwi (local
->index
)
5050 - tree_to_shwi (local
->min_index
))
5051 : local
->last_relative_index
+ 1)
5054 /* Bit position of this element from the start of the containing
5056 HOST_WIDE_INT constructor_relative_ebitpos
5058 ? int_bit_position (local
->field
)
5059 : ebitsize
* relative_index
);
5061 /* Bit position of this element from the start of a possibly ongoing
5062 outer byte buffer. */
5063 HOST_WIDE_INT byte_relative_ebitpos
5064 = bit_offset
+ constructor_relative_ebitpos
;
5066 /* From the start of a possibly ongoing outer byte buffer, offsets to
5067 the first bit of this element and to the first bit past the end of
5069 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
5070 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
5072 local
->last_relative_index
= relative_index
;
5074 if (local
->val
== NULL_TREE
)
5075 local
->val
= integer_zero_node
;
5077 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
5078 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
5079 local
->val
= TREE_OPERAND (local
->val
, 0);
5080 local
->val
= fold (local
->val
);
5082 if (TREE_CODE (local
->val
) != INTEGER_CST
5083 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
5085 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
5089 /* If this field does not start in this (or next) byte, skip some bytes. */
5090 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5092 /* Output remnant of any bit field in previous bytes. */
5093 if (local
->byte_buffer_in_use
)
5095 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5096 local
->total_bytes
++;
5097 local
->byte_buffer_in_use
= false;
5100 /* If still not at proper byte, advance to there. */
5101 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5103 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
5104 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
5105 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
5109 /* Set up the buffer if necessary. */
5110 if (!local
->byte_buffer_in_use
)
5114 local
->byte_buffer_in_use
= true;
5117 /* If this is nested constructor, recurse passing the bit offset and the
5118 pending data, then retrieve the new pending data afterwards. */
5119 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
5121 oc_outer_state temp_state
;
5122 temp_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
5123 temp_state
.byte
= local
->byte
;
5125 += output_constructor (local
->val
, 0, 0, &temp_state
);
5126 local
->byte
= temp_state
.byte
;
5130 /* Otherwise, we must split the element into pieces that fall within
5131 separate bytes, and combine each byte with previous or following
5133 while (next_offset
< end_offset
)
5137 HOST_WIDE_INT value
;
5138 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
5139 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
5141 /* Advance from byte to byte within this element when necessary. */
5142 while (next_byte
!= local
->total_bytes
)
5144 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5145 local
->total_bytes
++;
5149 /* Number of bits we can process at once (all part of the same byte). */
5150 this_time
= MIN (end_offset
- next_offset
, BITS_PER_UNIT
- next_bit
);
5151 if (BYTES_BIG_ENDIAN
)
5153 /* On big-endian machine, take the most significant bits (of the
5154 bits that are significant) first and put them into bytes from
5155 the most significant end. */
5156 shift
= end_offset
- next_offset
- this_time
;
5158 /* Don't try to take a bunch of bits that cross
5159 the word boundary in the INTEGER_CST. We can
5160 only select bits from one element. */
5161 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5162 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5164 const int end
= shift
+ this_time
- 1;
5165 shift
= end
& -HOST_BITS_PER_WIDE_INT
;
5166 this_time
= end
- shift
+ 1;
5169 /* Now get the bits from the appropriate constant word. */
5170 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5171 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5173 /* Get the result. This works only when:
5174 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5175 local
->byte
|= (((value
>> shift
)
5176 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5177 << (BITS_PER_UNIT
- this_time
- next_bit
));
5181 /* On little-endian machines, take the least significant bits of
5182 the value first and pack them starting at the least significant
5183 bits of the bytes. */
5184 shift
= next_offset
- byte_relative_ebitpos
;
5186 /* Don't try to take a bunch of bits that cross
5187 the word boundary in the INTEGER_CST. We can
5188 only select bits from one element. */
5189 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5190 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5192 = HOST_BITS_PER_WIDE_INT
- (shift
& (HOST_BITS_PER_WIDE_INT
- 1));
5194 /* Now get the bits from the appropriate constant word. */
5195 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5196 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5198 /* Get the result. This works only when:
5199 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5200 local
->byte
|= (((value
>> shift
)
5201 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5205 next_offset
+= this_time
;
5206 local
->byte_buffer_in_use
= true;
5210 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5211 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5212 caller output state of relevance in recursive invocations. */
5214 static unsigned HOST_WIDE_INT
5215 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
5216 unsigned int align
, oc_outer_state
*outer
)
5218 unsigned HOST_WIDE_INT cnt
;
5219 constructor_elt
*ce
;
5221 oc_local_state local
;
5223 /* Setup our local state to communicate with helpers. */
5225 local
.type
= TREE_TYPE (exp
);
5227 local
.align
= align
;
5228 if (TREE_CODE (local
.type
) == ARRAY_TYPE
&& TYPE_DOMAIN (local
.type
))
5229 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5231 local
.min_index
= NULL_TREE
;
5233 local
.total_bytes
= 0;
5234 local
.byte_buffer_in_use
= outer
!= NULL
;
5235 local
.byte
= outer
? outer
->byte
: 0;
5236 local
.last_relative_index
= -1;
5238 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5240 /* As CE goes through the elements of the constant, FIELD goes through the
5241 structure fields if the constant is a structure. If the constant is a
5242 union, we override this by getting the field from the TREE_LIST element.
5243 But the constant could also be an array. Then FIELD is zero.
5245 There is always a maximum of one element in the chain LINK for unions
5246 (even if the initializer in a source program incorrectly contains
5249 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5250 local
.field
= TYPE_FIELDS (local
.type
);
5252 local
.field
= NULL_TREE
;
5255 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5256 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5258 local
.val
= ce
->value
;
5259 local
.index
= NULL_TREE
;
5261 /* The element in a union constructor specifies the proper field
5263 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5264 local
.field
= ce
->index
;
5266 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5267 local
.index
= ce
->index
;
5269 if (local
.field
&& flag_verbose_asm
)
5270 fprintf (asm_out_file
, "%s %s:\n",
5272 DECL_NAME (local
.field
)
5273 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5276 /* Eliminate the marker that makes a cast not be an lvalue. */
5277 if (local
.val
!= NULL_TREE
)
5278 STRIP_NOPS (local
.val
);
5280 /* Output the current element, using the appropriate helper ... */
5282 /* For an array slice not part of an outer bitfield. */
5284 && local
.index
!= NULL_TREE
5285 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5286 output_constructor_array_range (&local
);
5288 /* For a field that is neither a true bitfield nor part of an outer one,
5289 known to be at least byte aligned and multiple-of-bytes long. */
5291 && (local
.field
== NULL_TREE
5292 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5293 output_constructor_regular_field (&local
);
5295 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5296 supported for scalar fields, so we may need to convert first. */
5299 if (TREE_CODE (local
.val
) == REAL_CST
)
5301 = fold_unary (VIEW_CONVERT_EXPR
,
5302 build_nonstandard_integer_type
5303 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5305 output_constructor_bitfield (&local
, outer
? outer
->bit_offset
: 0);
5309 /* If we are not at toplevel, save the pending data for our caller.
5310 Otherwise output the pending data and padding zeros as needed. */
5312 outer
->byte
= local
.byte
;
5315 if (local
.byte_buffer_in_use
)
5317 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5318 local
.total_bytes
++;
5321 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5323 assemble_zeros (local
.size
- local
.total_bytes
);
5324 local
.total_bytes
= local
.size
;
5328 return local
.total_bytes
;
5331 /* Mark DECL as weak. */
5334 mark_weak (tree decl
)
5336 if (DECL_WEAK (decl
))
5339 struct symtab_node
*n
= symtab_node::get (decl
);
5340 if (n
&& n
->refuse_visibility_changes
)
5341 error ("%+D declared weak after being used", decl
);
5342 DECL_WEAK (decl
) = 1;
5344 if (DECL_RTL_SET_P (decl
)
5345 && MEM_P (DECL_RTL (decl
))
5346 && XEXP (DECL_RTL (decl
), 0)
5347 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5348 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5351 /* Merge weak status between NEWDECL and OLDDECL. */
5354 merge_weak (tree newdecl
, tree olddecl
)
5356 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5358 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5361 /* We put the NEWDECL on the weak_decls list at some point
5362 and OLDDECL as well. Keep just OLDDECL on the list. */
5363 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5364 if (TREE_VALUE (*pwd
) == newdecl
)
5366 *pwd
= TREE_CHAIN (*pwd
);
5373 if (DECL_WEAK (newdecl
))
5377 /* NEWDECL is weak, but OLDDECL is not. */
5379 /* If we already output the OLDDECL, we're in trouble; we can't
5380 go back and make it weak. This should never happen in
5381 unit-at-a-time compilation. */
5382 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5384 /* If we've already generated rtl referencing OLDDECL, we may
5385 have done so in a way that will not function properly with
5386 a weak symbol. Again in unit-at-a-time this should be
5388 gcc_assert (!TREE_USED (olddecl
)
5389 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5391 if (TARGET_SUPPORTS_WEAK
)
5393 /* We put the NEWDECL on the weak_decls list at some point.
5394 Replace it with the OLDDECL. */
5395 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5396 if (TREE_VALUE (wd
) == newdecl
)
5398 TREE_VALUE (wd
) = olddecl
;
5401 /* We may not find the entry on the list. If NEWDECL is a
5402 weak alias, then we will have already called
5403 globalize_decl to remove the entry; in that case, we do
5404 not need to do anything. */
5407 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5408 mark_weak (olddecl
);
5411 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5412 weak. Just update NEWDECL to indicate that it's weak too. */
5413 mark_weak (newdecl
);
5416 /* Declare DECL to be a weak symbol. */
5419 declare_weak (tree decl
)
5421 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5422 if (! TREE_PUBLIC (decl
))
5423 error ("weak declaration of %q+D must be public", decl
);
5424 else if (!TARGET_SUPPORTS_WEAK
)
5425 warning (0, "weak declaration of %q+D not supported", decl
);
5428 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5429 DECL_ATTRIBUTES (decl
)
5430 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5434 weak_finish_1 (tree decl
)
5436 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5437 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5440 if (! TREE_USED (decl
))
5443 #ifdef ASM_WEAKEN_DECL
5444 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5446 #ifdef ASM_WEAKEN_LABEL
5447 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5449 #ifdef ASM_OUTPUT_WEAK_ALIAS
5451 static bool warn_once
= 0;
5454 warning (0, "only weak aliases are supported in this configuration");
5464 /* Fiven an assembly name, find the decl it is associated with. */
5466 find_decl (tree target
)
5468 symtab_node
*node
= symtab_node::get_for_asmname (target
);
5474 /* This TREE_LIST contains weakref targets. */
5476 static GTY(()) tree weakref_targets
;
5478 /* Emit any pending weak declarations. */
5485 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5487 tree alias_decl
= TREE_PURPOSE (t
);
5488 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5490 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5491 /* Remove alias_decl from the weak list, but leave entries for
5492 the target alone. */
5494 #ifndef ASM_OUTPUT_WEAKREF
5495 else if (! TREE_SYMBOL_REFERENCED (target
))
5497 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5498 defined, otherwise we and weak_finish_1 would use
5499 different macros. */
5500 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5501 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5503 tree decl
= find_decl (target
);
5507 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5508 TREE_CODE (alias_decl
), target
,
5509 TREE_TYPE (alias_decl
));
5511 DECL_EXTERNAL (decl
) = 1;
5512 TREE_PUBLIC (decl
) = 1;
5513 DECL_ARTIFICIAL (decl
) = 1;
5514 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5515 TREE_USED (decl
) = 1;
5518 weak_finish_1 (decl
);
5527 /* Remove the alias and the target from the pending weak list
5528 so that we do not emit any .weak directives for the former,
5529 nor multiple .weak directives for the latter. */
5530 for (p
= &weak_decls
; (t2
= *p
) ; )
5532 if (TREE_VALUE (t2
) == alias_decl
5533 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5534 *p
= TREE_CHAIN (t2
);
5536 p
= &TREE_CHAIN (t2
);
5539 /* Remove other weakrefs to the same target, to speed things up. */
5540 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5542 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5543 *p
= TREE_CHAIN (t2
);
5545 p
= &TREE_CHAIN (t2
);
5550 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5552 tree decl
= TREE_VALUE (t
);
5554 weak_finish_1 (decl
);
5558 /* Emit the assembly bits to indicate that DECL is globally visible. */
5561 globalize_decl (tree decl
)
5564 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5565 if (DECL_WEAK (decl
))
5567 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5570 #ifdef ASM_WEAKEN_DECL
5571 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5573 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5576 /* Remove this function from the pending weak list so that
5577 we do not emit multiple .weak directives for it. */
5578 for (p
= &weak_decls
; (t
= *p
) ; )
5580 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5581 *p
= TREE_CHAIN (t
);
5583 p
= &TREE_CHAIN (t
);
5586 /* Remove weakrefs to the same target from the pending weakref
5587 list, for the same reason. */
5588 for (p
= &weakref_targets
; (t
= *p
) ; )
5590 if (DECL_ASSEMBLER_NAME (decl
)
5591 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5592 *p
= TREE_CHAIN (t
);
5594 p
= &TREE_CHAIN (t
);
5601 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5604 vec
<alias_pair
, va_gc
> *alias_pairs
;
5606 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5607 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5608 tree node is DECL to have the value of the tree node TARGET. */
5611 do_assemble_alias (tree decl
, tree target
)
5615 /* Emulated TLS had better not get this var. */
5616 gcc_assert (!(!targetm
.have_tls
5617 && TREE_CODE (decl
) == VAR_DECL
5618 && DECL_THREAD_LOCAL_P (decl
)));
5620 if (TREE_ASM_WRITTEN (decl
))
5623 id
= DECL_ASSEMBLER_NAME (decl
);
5624 ultimate_transparent_alias_target (&id
);
5625 ultimate_transparent_alias_target (&target
);
5627 /* We must force creation of DECL_RTL for debug info generation, even though
5628 we don't use it here. */
5629 make_decl_rtl (decl
);
5631 TREE_ASM_WRITTEN (decl
) = 1;
5632 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5633 TREE_ASM_WRITTEN (id
) = 1;
5635 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5637 if (!TREE_SYMBOL_REFERENCED (target
))
5638 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5640 #ifdef ASM_OUTPUT_WEAKREF
5641 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5642 IDENTIFIER_POINTER (id
),
5643 IDENTIFIER_POINTER (target
));
5645 if (!TARGET_SUPPORTS_WEAK
)
5647 error_at (DECL_SOURCE_LOCATION (decl
),
5648 "weakref is not supported in this configuration");
5655 #ifdef ASM_OUTPUT_DEF
5656 tree orig_decl
= decl
;
5658 if (TREE_CODE (decl
) == FUNCTION_DECL
5659 && cgraph_node::get (decl
)->instrumentation_clone
5660 && cgraph_node::get (decl
)->instrumented_version
)
5661 orig_decl
= cgraph_node::get (decl
)->instrumented_version
->decl
;
5663 /* Make name accessible from other files, if appropriate. */
5665 if (TREE_PUBLIC (decl
) || TREE_PUBLIC (orig_decl
))
5667 globalize_decl (decl
);
5668 maybe_assemble_visibility (decl
);
5670 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5672 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5673 if (targetm
.has_ifunc_p ())
5674 ASM_OUTPUT_TYPE_DIRECTIVE
5675 (asm_out_file
, IDENTIFIER_POINTER (id
),
5679 error_at (DECL_SOURCE_LOCATION (decl
),
5680 "ifunc is not supported on this target");
5683 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5684 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5686 ASM_OUTPUT_DEF (asm_out_file
,
5687 IDENTIFIER_POINTER (id
),
5688 IDENTIFIER_POINTER (target
));
5690 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5695 name
= IDENTIFIER_POINTER (id
);
5696 # ifdef ASM_WEAKEN_DECL
5697 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5699 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5701 /* Remove this function from the pending weak list so that
5702 we do not emit multiple .weak directives for it. */
5703 for (p
= &weak_decls
; (t
= *p
) ; )
5704 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
))
5705 || id
== DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5706 *p
= TREE_CHAIN (t
);
5708 p
= &TREE_CHAIN (t
);
5710 /* Remove weakrefs to the same target from the pending weakref
5711 list, for the same reason. */
5712 for (p
= &weakref_targets
; (t
= *p
) ; )
5714 if (id
== ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5715 *p
= TREE_CHAIN (t
);
5717 p
= &TREE_CHAIN (t
);
5723 /* Emit an assembler directive to make the symbol for DECL an alias to
5724 the symbol for TARGET. */
5727 assemble_alias (tree decl
, tree target
)
5731 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5733 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5735 ultimate_transparent_alias_target (&target
);
5737 if (alias
== target
)
5738 error ("weakref %q+D ultimately targets itself", decl
);
5739 if (TREE_PUBLIC (decl
))
5740 error ("weakref %q+D must have static linkage", decl
);
5744 #if !defined (ASM_OUTPUT_DEF)
5745 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5746 error_at (DECL_SOURCE_LOCATION (decl
),
5747 "alias definitions not supported in this configuration");
5748 TREE_ASM_WRITTEN (decl
) = 1;
5751 if (!DECL_WEAK (decl
))
5753 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5754 error_at (DECL_SOURCE_LOCATION (decl
),
5755 "ifunc is not supported in this configuration");
5757 error_at (DECL_SOURCE_LOCATION (decl
),
5758 "only weak aliases are supported in this configuration");
5759 TREE_ASM_WRITTEN (decl
) = 1;
5765 TREE_USED (decl
) = 1;
5767 /* Allow aliases to aliases. */
5768 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5769 cgraph_node::get_create (decl
)->alias
= true;
5771 varpool_node::get_create (decl
)->alias
= true;
5773 /* If the target has already been emitted, we don't have to queue the
5774 alias. This saves a tad of memory. */
5775 if (symtab
->global_info_ready
)
5776 target_decl
= find_decl (target
);
5779 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5780 || symtab
->state
>= EXPANSION
)
5781 do_assemble_alias (decl
, target
);
5784 alias_pair p
= {decl
, target
};
5785 vec_safe_push (alias_pairs
, p
);
5789 /* Record and output a table of translations from original function
5790 to its transaction aware clone. Note that tm_pure functions are
5791 considered to be their own clone. */
5793 struct tm_clone_hasher
: ggc_cache_ptr_hash
<tree_map
>
5795 static hashval_t
hash (tree_map
*m
) { return tree_map_hash (m
); }
5796 static bool equal (tree_map
*a
, tree_map
*b
) { return tree_map_eq (a
, b
); }
5799 keep_cache_entry (tree_map
*&e
)
5801 return ggc_marked_p (e
->base
.from
);
5805 static GTY((cache
)) hash_table
<tm_clone_hasher
> *tm_clone_hash
;
5808 record_tm_clone_pair (tree o
, tree n
)
5810 struct tree_map
**slot
, *h
;
5812 if (tm_clone_hash
== NULL
)
5813 tm_clone_hash
= hash_table
<tm_clone_hasher
>::create_ggc (32);
5815 h
= ggc_alloc
<tree_map
> ();
5816 h
->hash
= htab_hash_pointer (o
);
5820 slot
= tm_clone_hash
->find_slot_with_hash (h
, h
->hash
, INSERT
);
5825 get_tm_clone_pair (tree o
)
5829 struct tree_map
*h
, in
;
5832 in
.hash
= htab_hash_pointer (o
);
5833 h
= tm_clone_hash
->find_with_hash (&in
, in
.hash
);
5840 typedef struct tm_alias_pair
5848 /* Dump the actual pairs to the .tm_clone_table section. */
5851 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5855 bool switched
= false;
5857 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5861 struct cgraph_node
*src_n
= cgraph_node::get (src
);
5862 struct cgraph_node
*dst_n
= cgraph_node::get (dst
);
5864 /* The function ipa_tm_create_version() marks the clone as needed if
5865 the original function was needed. But we also mark the clone as
5866 needed if we ever called the clone indirectly through
5867 TM_GETTMCLONE. If neither of these are true, we didn't generate
5868 a clone, and we didn't call it indirectly... no sense keeping it
5869 in the clone table. */
5870 if (!dst_n
|| !dst_n
->definition
)
5873 /* This covers the case where we have optimized the original
5874 function away, and only access the transactional clone. */
5875 if (!src_n
|| !src_n
->definition
)
5880 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5881 assemble_align (POINTER_SIZE
);
5885 assemble_integer (XEXP (DECL_RTL (src
), 0),
5886 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
5887 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5888 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
5892 /* Provide a default for the tm_clone_table section. */
5895 default_clone_table_section (void)
5897 return get_named_section (NULL
, ".tm_clone_table", 3);
5900 /* Helper comparison function for qsorting by the DECL_UID stored in
5901 alias_pair->emitted_diags. */
5904 tm_alias_pair_cmp (const void *x
, const void *y
)
5906 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5907 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5908 if (p1
->uid
< p2
->uid
)
5910 if (p1
->uid
> p2
->uid
)
5916 finish_tm_clone_pairs (void)
5918 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5920 if (tm_clone_hash
== NULL
)
5923 /* We need a determenistic order for the .tm_clone_table, otherwise
5924 we will get bootstrap comparison failures, so dump the hash table
5925 to a vector, sort it, and dump the vector. */
5927 /* Dump the hashtable to a vector. */
5929 hash_table
<tm_clone_hasher
>::iterator iter
;
5930 FOR_EACH_HASH_TABLE_ELEMENT (*tm_clone_hash
, map
, tree_map
*, iter
)
5932 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5933 tm_alias_pairs
.safe_push (p
);
5936 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5939 dump_tm_clone_pairs (tm_alias_pairs
);
5941 tm_clone_hash
->empty ();
5942 tm_clone_hash
= NULL
;
5943 tm_alias_pairs
.release ();
5947 /* Emit an assembler directive to set symbol for DECL visibility to
5948 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5951 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5952 int vis ATTRIBUTE_UNUSED
)
5954 #ifdef HAVE_GAS_HIDDEN
5955 static const char * const visibility_types
[] = {
5956 NULL
, "protected", "hidden", "internal"
5959 const char *name
, *type
;
5962 id
= DECL_ASSEMBLER_NAME (decl
);
5963 ultimate_transparent_alias_target (&id
);
5964 name
= IDENTIFIER_POINTER (id
);
5966 type
= visibility_types
[vis
];
5968 fprintf (asm_out_file
, "\t.%s\t", type
);
5969 assemble_name (asm_out_file
, name
);
5970 fprintf (asm_out_file
, "\n");
5972 if (!DECL_ARTIFICIAL (decl
))
5973 warning (OPT_Wattributes
, "visibility attribute not supported "
5974 "in this configuration; ignored");
5978 /* A helper function to call assemble_visibility when needed for a decl. */
5981 maybe_assemble_visibility (tree decl
)
5983 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5985 if (TREE_CODE (decl
) == FUNCTION_DECL
5986 && cgraph_node::get (decl
)
5987 && cgraph_node::get (decl
)->instrumentation_clone
5988 && cgraph_node::get (decl
)->instrumented_version
)
5989 vis
= DECL_VISIBILITY (cgraph_node::get (decl
)->instrumented_version
->decl
);
5991 if (vis
!= VISIBILITY_DEFAULT
)
5993 targetm
.asm_out
.assemble_visibility (decl
, vis
);
6000 /* Returns 1 if the target configuration supports defining public symbols
6001 so that one of them will be chosen at link time instead of generating a
6002 multiply-defined symbol error, whether through the use of weak symbols or
6003 a target-specific mechanism for having duplicates discarded. */
6006 supports_one_only (void)
6008 if (SUPPORTS_ONE_ONLY
)
6010 return TARGET_SUPPORTS_WEAK
;
6013 /* Set up DECL as a public symbol that can be defined in multiple
6014 translation units without generating a linker error. */
6017 make_decl_one_only (tree decl
, tree comdat_group
)
6019 struct symtab_node
*symbol
;
6020 gcc_assert (TREE_CODE (decl
) == VAR_DECL
6021 || TREE_CODE (decl
) == FUNCTION_DECL
);
6023 TREE_PUBLIC (decl
) = 1;
6025 if (TREE_CODE (decl
) == VAR_DECL
)
6026 symbol
= varpool_node::get_create (decl
);
6028 symbol
= cgraph_node::get_create (decl
);
6030 if (SUPPORTS_ONE_ONLY
)
6032 #ifdef MAKE_DECL_ONE_ONLY
6033 MAKE_DECL_ONE_ONLY (decl
);
6035 symbol
->set_comdat_group (comdat_group
);
6037 else if (TREE_CODE (decl
) == VAR_DECL
6038 && (DECL_INITIAL (decl
) == 0
6039 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6040 DECL_COMMON (decl
) = 1;
6043 gcc_assert (TARGET_SUPPORTS_WEAK
);
6044 DECL_WEAK (decl
) = 1;
6049 init_varasm_once (void)
6051 section_htab
= hash_table
<section_hasher
>::create_ggc (31);
6052 object_block_htab
= hash_table
<object_block_hasher
>::create_ggc (31);
6053 const_desc_htab
= hash_table
<tree_descriptor_hasher
>::create_ggc (1009);
6055 shared_constant_pool
= create_constant_pool ();
6057 #ifdef TEXT_SECTION_ASM_OP
6058 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
6059 TEXT_SECTION_ASM_OP
);
6062 #ifdef DATA_SECTION_ASM_OP
6063 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6064 DATA_SECTION_ASM_OP
);
6067 #ifdef SDATA_SECTION_ASM_OP
6068 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6069 SDATA_SECTION_ASM_OP
);
6072 #ifdef READONLY_DATA_SECTION_ASM_OP
6073 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
6074 READONLY_DATA_SECTION_ASM_OP
);
6077 #ifdef CTORS_SECTION_ASM_OP
6078 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
6079 CTORS_SECTION_ASM_OP
);
6082 #ifdef DTORS_SECTION_ASM_OP
6083 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
6084 DTORS_SECTION_ASM_OP
);
6087 #ifdef BSS_SECTION_ASM_OP
6088 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6089 output_section_asm_op
,
6090 BSS_SECTION_ASM_OP
);
6093 #ifdef SBSS_SECTION_ASM_OP
6094 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6095 output_section_asm_op
,
6096 SBSS_SECTION_ASM_OP
);
6099 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6100 | SECTION_COMMON
, emit_tls_common
);
6101 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6102 | SECTION_COMMON
, emit_local
);
6103 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6104 | SECTION_COMMON
, emit_common
);
6106 #if defined ASM_OUTPUT_ALIGNED_BSS
6107 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
6111 targetm
.asm_out
.init_sections ();
6113 if (readonly_data_section
== NULL
)
6114 readonly_data_section
= text_section
;
6116 #ifdef ASM_OUTPUT_EXTERNAL
6117 pending_assemble_externals_set
= new hash_set
<tree
>;
6122 decl_default_tls_model (const_tree decl
)
6124 enum tls_model kind
;
6127 is_local
= targetm
.binds_local_p (decl
);
6131 kind
= TLS_MODEL_LOCAL_EXEC
;
6133 kind
= TLS_MODEL_INITIAL_EXEC
;
6136 /* Local dynamic is inefficient when we're not combining the
6137 parts of the address. */
6138 else if (optimize
&& is_local
)
6139 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
6141 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
6142 if (kind
< flag_tls_default
)
6143 kind
= flag_tls_default
;
6148 /* Select a set of attributes for section NAME based on the properties
6149 of DECL and whether or not RELOC indicates that DECL's initializer
6150 might contain runtime relocations.
6152 We make the section read-only and executable for a function decl,
6153 read-only for a const data decl, and writable for a non-const data decl. */
6156 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6160 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6161 flags
= SECTION_CODE
;
6164 enum section_category category
6165 = categorize_decl_for_section (decl
, reloc
);
6166 if (decl_readonly_section_1 (category
))
6168 else if (category
== SECCAT_DATA_REL_RO
6169 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6170 flags
= SECTION_WRITE
| SECTION_RELRO
;
6172 flags
= SECTION_WRITE
;
6176 flags
= SECTION_WRITE
;
6177 if (strcmp (name
, ".data.rel.ro") == 0
6178 || strcmp (name
, ".data.rel.ro.local") == 0)
6179 flags
|= SECTION_RELRO
;
6182 if (decl
&& DECL_P (decl
) && DECL_COMDAT_GROUP (decl
))
6183 flags
|= SECTION_LINKONCE
;
6185 if (strcmp (name
, ".vtable_map_vars") == 0)
6186 flags
|= SECTION_LINKONCE
;
6188 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6189 flags
|= SECTION_TLS
| SECTION_WRITE
;
6191 if (strcmp (name
, ".bss") == 0
6192 || strncmp (name
, ".bss.", 5) == 0
6193 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6194 || strcmp (name
, ".persistent.bss") == 0
6195 || strcmp (name
, ".sbss") == 0
6196 || strncmp (name
, ".sbss.", 6) == 0
6197 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6198 flags
|= SECTION_BSS
;
6200 if (strcmp (name
, ".tdata") == 0
6201 || strncmp (name
, ".tdata.", 7) == 0
6202 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6203 flags
|= SECTION_TLS
;
6205 if (strcmp (name
, ".tbss") == 0
6206 || strncmp (name
, ".tbss.", 6) == 0
6207 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6208 flags
|= SECTION_TLS
| SECTION_BSS
;
6210 /* These three sections have special ELF types. They are neither
6211 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6212 want to print a section type (@progbits or @nobits). If someone
6213 is silly enough to emit code or TLS variables to one of these
6214 sections, then don't handle them specially. */
6215 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6216 && (strcmp (name
, ".init_array") == 0
6217 || strcmp (name
, ".fini_array") == 0
6218 || strcmp (name
, ".preinit_array") == 0))
6219 flags
|= SECTION_NOTYPE
;
6224 /* Return true if the target supports some form of global BSS,
6225 either through bss_noswitch_section, or by selecting a BSS
6226 section in TARGET_ASM_SELECT_SECTION. */
6229 have_global_bss_p (void)
6231 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6234 /* Output assembly to switch to section NAME with attribute FLAGS.
6235 Four variants for common object file formats. */
6238 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6239 unsigned int flags ATTRIBUTE_UNUSED
,
6240 tree decl ATTRIBUTE_UNUSED
)
6242 /* Some object formats don't support named sections at all. The
6243 front-end should already have flagged this as an error. */
6247 #ifndef TLS_SECTION_ASM_FLAG
6248 #define TLS_SECTION_ASM_FLAG 'T'
6252 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6253 tree decl ATTRIBUTE_UNUSED
)
6255 char flagchars
[10], *f
= flagchars
;
6257 /* If we have already declared this section, we can use an
6258 abbreviated form to switch back to it -- unless this section is
6259 part of a COMDAT groups, in which case GAS requires the full
6260 declaration every time. */
6261 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6262 && (flags
& SECTION_DECLARED
))
6264 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6268 if (!(flags
& SECTION_DEBUG
))
6270 #if defined (HAVE_GAS_SECTION_EXCLUDE) && HAVE_GAS_SECTION_EXCLUDE == 1
6271 if (flags
& SECTION_EXCLUDE
)
6274 if (flags
& SECTION_WRITE
)
6276 if (flags
& SECTION_CODE
)
6278 if (flags
& SECTION_SMALL
)
6280 if (flags
& SECTION_MERGE
)
6282 if (flags
& SECTION_STRINGS
)
6284 if (flags
& SECTION_TLS
)
6285 *f
++ = TLS_SECTION_ASM_FLAG
;
6286 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6290 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6292 if (!(flags
& SECTION_NOTYPE
))
6297 if (flags
& SECTION_BSS
)
6303 /* On platforms that use "@" as the assembly comment character,
6305 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6307 fprintf (asm_out_file
, format
, type
);
6309 if (flags
& SECTION_ENTSIZE
)
6310 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6311 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6313 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6314 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6316 fprintf (asm_out_file
, ",%s,comdat",
6317 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6321 putc ('\n', asm_out_file
);
6325 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6326 tree decl ATTRIBUTE_UNUSED
)
6328 char flagchars
[8], *f
= flagchars
;
6330 if (flags
& SECTION_WRITE
)
6332 if (flags
& SECTION_CODE
)
6336 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6340 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6343 default_coff_asm_named_section (name
, flags
, decl
);
6345 if (flags
& SECTION_LINKONCE
)
6347 /* Functions may have been compiled at various levels of
6348 optimization so we can't use `same_size' here.
6349 Instead, have the linker pick one. */
6350 fprintf (asm_out_file
, "\t.linkonce %s\n",
6351 (flags
& SECTION_CODE
? "discard" : "same_size"));
6355 /* The lame default section selector. */
6358 default_select_section (tree decl
, int reloc
,
6359 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6363 if (decl_readonly_section (decl
, reloc
))
6364 return readonly_data_section
;
6366 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6368 if (! ((flag_pic
&& reloc
)
6369 || !TREE_READONLY (decl
)
6370 || TREE_SIDE_EFFECTS (decl
)
6371 || !TREE_CONSTANT (decl
)))
6372 return readonly_data_section
;
6374 else if (TREE_CODE (decl
) == STRING_CST
)
6375 return readonly_data_section
;
6376 else if (! (flag_pic
&& reloc
))
6377 return readonly_data_section
;
6379 return data_section
;
6382 enum section_category
6383 categorize_decl_for_section (const_tree decl
, int reloc
)
6385 enum section_category ret
;
6387 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6389 else if (TREE_CODE (decl
) == STRING_CST
)
6391 if ((flag_sanitize
& SANITIZE_ADDRESS
)
6392 && asan_protect_global (CONST_CAST_TREE (decl
)))
6393 /* or !flag_merge_constants */
6394 return SECCAT_RODATA
;
6396 return SECCAT_RODATA_MERGE_STR
;
6398 else if (TREE_CODE (decl
) == VAR_DECL
)
6400 if (bss_initializer_p (decl
))
6402 else if (! TREE_READONLY (decl
)
6403 || TREE_SIDE_EFFECTS (decl
)
6404 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6406 /* Here the reloc_rw_mask is not testing whether the section should
6407 be read-only or not, but whether the dynamic link will have to
6408 do something. If so, we wish to segregate the data in order to
6409 minimize cache misses inside the dynamic linker. */
6410 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6411 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6415 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6416 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6417 else if (reloc
|| flag_merge_constants
< 2
6418 || ((flag_sanitize
& SANITIZE_ADDRESS
)
6419 && asan_protect_global (CONST_CAST_TREE (decl
))))
6420 /* C and C++ don't allow different variables to share the same
6421 location. -fmerge-all-constants allows even that (at the
6422 expense of not conforming). */
6423 ret
= SECCAT_RODATA
;
6424 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6425 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6427 ret
= SECCAT_RODATA_MERGE_CONST
;
6429 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6431 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6432 || TREE_SIDE_EFFECTS (decl
)
6433 || ! TREE_CONSTANT (decl
))
6436 ret
= SECCAT_RODATA
;
6439 ret
= SECCAT_RODATA
;
6441 /* There are no read-only thread-local sections. */
6442 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6444 /* Note that this would be *just* SECCAT_BSS, except that there's
6445 no concept of a read-only thread-local-data section. */
6446 if (ret
== SECCAT_BSS
6447 || (flag_zero_initialized_in_bss
6448 && initializer_zerop (DECL_INITIAL (decl
))))
6454 /* If the target uses small data sections, select it. */
6455 else if (targetm
.in_small_data_p (decl
))
6457 if (ret
== SECCAT_BSS
)
6459 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6460 ret
= SECCAT_SRODATA
;
6469 decl_readonly_section_1 (enum section_category category
)
6474 case SECCAT_RODATA_MERGE_STR
:
6475 case SECCAT_RODATA_MERGE_STR_INIT
:
6476 case SECCAT_RODATA_MERGE_CONST
:
6477 case SECCAT_SRODATA
:
6485 decl_readonly_section (const_tree decl
, int reloc
)
6487 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6490 /* Select a section based on the above categorization. */
6493 default_elf_select_section (tree decl
, int reloc
,
6494 unsigned HOST_WIDE_INT align
)
6497 switch (categorize_decl_for_section (decl
, reloc
))
6500 /* We're not supposed to be called on FUNCTION_DECLs. */
6503 return readonly_data_section
;
6504 case SECCAT_RODATA_MERGE_STR
:
6505 return mergeable_string_section (decl
, align
, 0);
6506 case SECCAT_RODATA_MERGE_STR_INIT
:
6507 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6508 case SECCAT_RODATA_MERGE_CONST
:
6509 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6510 case SECCAT_SRODATA
:
6514 return data_section
;
6515 case SECCAT_DATA_REL
:
6516 sname
= ".data.rel";
6518 case SECCAT_DATA_REL_LOCAL
:
6519 sname
= ".data.rel.local";
6521 case SECCAT_DATA_REL_RO
:
6522 sname
= ".data.rel.ro";
6524 case SECCAT_DATA_REL_RO_LOCAL
:
6525 sname
= ".data.rel.ro.local";
6548 return get_named_section (decl
, sname
, reloc
);
6551 /* Construct a unique section name based on the decl name and the
6552 categorization performed above. */
6555 default_unique_section (tree decl
, int reloc
)
6557 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6558 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6559 const char *prefix
, *name
, *linkonce
;
6563 switch (categorize_decl_for_section (decl
, reloc
))
6566 prefix
= one_only
? ".t" : ".text";
6569 case SECCAT_RODATA_MERGE_STR
:
6570 case SECCAT_RODATA_MERGE_STR_INIT
:
6571 case SECCAT_RODATA_MERGE_CONST
:
6572 prefix
= one_only
? ".r" : ".rodata";
6574 case SECCAT_SRODATA
:
6575 prefix
= one_only
? ".s2" : ".sdata2";
6578 prefix
= one_only
? ".d" : ".data";
6580 case SECCAT_DATA_REL
:
6581 prefix
= one_only
? ".d.rel" : ".data.rel";
6583 case SECCAT_DATA_REL_LOCAL
:
6584 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6586 case SECCAT_DATA_REL_RO
:
6587 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6589 case SECCAT_DATA_REL_RO_LOCAL
:
6590 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6593 prefix
= one_only
? ".s" : ".sdata";
6596 prefix
= one_only
? ".b" : ".bss";
6599 prefix
= one_only
? ".sb" : ".sbss";
6602 prefix
= one_only
? ".td" : ".tdata";
6605 prefix
= one_only
? ".tb" : ".tbss";
6611 id
= DECL_ASSEMBLER_NAME (decl
);
6612 ultimate_transparent_alias_target (&id
);
6613 name
= IDENTIFIER_POINTER (id
);
6614 name
= targetm
.strip_name_encoding (name
);
6616 /* If we're using one_only, then there needs to be a .gnu.linkonce
6617 prefix to the section name. */
6618 linkonce
= one_only
? ".gnu.linkonce" : "";
6620 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6622 set_decl_section_name (decl
, string
);
6625 /* Subroutine of compute_reloc_for_rtx for leaf rtxes. */
6628 compute_reloc_for_rtx_1 (const_rtx x
)
6630 switch (GET_CODE (x
))
6633 return SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6641 /* Like compute_reloc_for_constant, except for an RTX. The return value
6642 is a mask for which bit 1 indicates a global relocation, and bit 0
6643 indicates a local relocation. */
6646 compute_reloc_for_rtx (const_rtx x
)
6648 switch (GET_CODE (x
))
6652 return compute_reloc_for_rtx_1 (x
);
6657 subrtx_iterator::array_type array
;
6658 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
6659 reloc
|= compute_reloc_for_rtx_1 (*iter
);
6669 default_select_rtx_section (machine_mode mode ATTRIBUTE_UNUSED
,
6671 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6673 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6674 return data_section
;
6676 return readonly_data_section
;
6680 default_elf_select_rtx_section (machine_mode mode
, rtx x
,
6681 unsigned HOST_WIDE_INT align
)
6683 int reloc
= compute_reloc_for_rtx (x
);
6685 /* ??? Handle small data here somehow. */
6687 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6690 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6692 return get_named_section (NULL
, ".data.rel.ro", 3);
6695 return mergeable_constant_section (mode
, align
, 0);
6698 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6701 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6706 /* Careful not to prod global register variables. */
6709 symbol
= XEXP (rtl
, 0);
6710 if (GET_CODE (symbol
) != SYMBOL_REF
)
6713 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6714 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6715 flags
|= SYMBOL_FLAG_FUNCTION
;
6716 if (targetm
.binds_local_p (decl
))
6717 flags
|= SYMBOL_FLAG_LOCAL
;
6718 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6719 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6720 else if (targetm
.in_small_data_p (decl
))
6721 flags
|= SYMBOL_FLAG_SMALL
;
6722 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6723 being PUBLIC, the thing *must* be defined in this translation unit.
6724 Prevent this buglet from being propagated into rtl code as well. */
6725 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6726 flags
|= SYMBOL_FLAG_EXTERNAL
;
6728 SYMBOL_REF_FLAGS (symbol
) = flags
;
6731 /* By default, we do nothing for encode_section_info, so we need not
6732 do anything but discard the '*' marker. */
6735 default_strip_name_encoding (const char *str
)
6737 return str
+ (*str
== '*');
6740 #ifdef ASM_OUTPUT_DEF
6741 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6742 anchor relative to ".", the current section position. */
6745 default_asm_output_anchor (rtx symbol
)
6749 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6750 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6751 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6755 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6758 default_use_anchors_for_symbol_p (const_rtx symbol
)
6763 /* Don't use anchors for mergeable sections. The linker might move
6764 the objects around. */
6765 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6766 if (sect
->common
.flags
& SECTION_MERGE
)
6769 /* Don't use anchors for small data sections. The small data register
6770 acts as an anchor for such sections. */
6771 if (sect
->common
.flags
& SECTION_SMALL
)
6774 decl
= SYMBOL_REF_DECL (symbol
);
6775 if (decl
&& DECL_P (decl
))
6777 /* Don't use section anchors for decls that might be defined or
6778 usurped by other modules. */
6779 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
6782 /* Don't use section anchors for decls that will be placed in a
6783 small data section. */
6784 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6785 one above. The problem is that we only use SECTION_SMALL for
6786 sections that should be marked as small in the section directive. */
6787 if (targetm
.in_small_data_p (decl
))
6793 /* Return true when RESOLUTION indicate that symbol will be bound to the
6794 definition provided by current .o file. */
6797 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6799 return (resolution
== LDPR_PREVAILING_DEF
6800 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6801 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6804 /* Return true when RESOLUTION indicate that symbol will be bound locally
6805 within current executable or DSO. */
6808 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6810 return (resolution
== LDPR_PREVAILING_DEF
6811 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6812 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6813 || resolution
== LDPR_PREEMPTED_REG
6814 || resolution
== LDPR_PREEMPTED_IR
6815 || resolution
== LDPR_RESOLVED_IR
6816 || resolution
== LDPR_RESOLVED_EXEC
);
6819 /* COMMON_LOCAL_P is true means that the linker can guarantee that an
6820 uninitialized common symbol in the executable will still be defined
6821 (through COPY relocation) in the executable. */
6824 default_binds_local_p_3 (const_tree exp
, bool shlib
, bool weak_dominate
,
6825 bool extern_protected_data
, bool common_local_p
)
6827 /* A non-decl is an entry in the constant pool. */
6831 /* Weakrefs may not bind locally, even though the weakref itself is always
6832 static and therefore local. Similarly, the resolver for ifunc functions
6833 might resolve to a non-local function.
6834 FIXME: We can resolve the weakref case more curefuly by looking at the
6836 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6837 || (TREE_CODE (exp
) == FUNCTION_DECL
6838 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6841 /* Static variables are always local. */
6842 if (! TREE_PUBLIC (exp
))
6845 /* With resolution file in hand, take look into resolutions.
6846 We can't just return true for resolved_locally symbols,
6847 because dynamic linking might overwrite symbols
6848 in shared libraries. */
6849 bool resolved_locally
= false;
6851 bool uninited_common
= (DECL_COMMON (exp
)
6852 && (DECL_INITIAL (exp
) == NULL
6854 && DECL_INITIAL (exp
) == error_mark_node
)));
6856 /* A non-external variable is defined locally only if it isn't
6857 uninitialized COMMON variable or common_local_p is true. */
6858 bool defined_locally
= (!DECL_EXTERNAL (exp
)
6859 && (!uninited_common
|| common_local_p
));
6860 if (symtab_node
*node
= symtab_node::get (exp
))
6862 if (node
->in_other_partition
)
6863 defined_locally
= true;
6864 if (resolution_to_local_definition_p (node
->resolution
))
6865 defined_locally
= resolved_locally
= true;
6866 else if (resolution_local_p (node
->resolution
))
6867 resolved_locally
= true;
6869 if (defined_locally
&& weak_dominate
&& !shlib
)
6870 resolved_locally
= true;
6872 /* Undefined weak symbols are never defined locally. */
6873 if (DECL_WEAK (exp
) && !defined_locally
)
6876 /* A symbol is local if the user has said explicitly that it will be,
6877 or if we have a definition for the symbol. We cannot infer visibility
6878 for undefined symbols. */
6879 if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
6880 && (TREE_CODE (exp
) == FUNCTION_DECL
6881 || !extern_protected_data
6882 || DECL_VISIBILITY (exp
) != VISIBILITY_PROTECTED
)
6883 && (DECL_VISIBILITY_SPECIFIED (exp
) || defined_locally
))
6886 /* If PIC, then assume that any global name can be overridden by
6887 symbols resolved from other modules. */
6891 /* Variables defined outside this object might not be local. */
6892 if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6895 /* Non-dominant weak symbols are not defined locally. */
6896 if (DECL_WEAK (exp
) && !resolved_locally
)
6899 /* Uninitialized COMMON variable may be unified with symbols
6900 resolved from other modules. */
6901 if (uninited_common
&& !resolved_locally
)
6904 /* Otherwise we're left with initialized (or non-common) global data
6905 which is of necessity defined locally. */
6909 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6910 wrt cross-module name binding. */
6913 default_binds_local_p (const_tree exp
)
6915 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, false, false);
6918 /* Similar to default_binds_local_p, but common symbol may be local. */
6921 default_binds_local_p_2 (const_tree exp
)
6923 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, false,
6928 default_binds_local_p_1 (const_tree exp
, int shlib
)
6930 return default_binds_local_p_3 (exp
, shlib
!= 0, false, false, false);
6933 /* Return true when references to DECL must bind to current definition in
6936 The condition is usually equivalent to whether the function binds to the
6937 current module (shared library or executable), that is to binds_local_p.
6938 We use this fact to avoid need for another target hook and implement
6939 the logic using binds_local_p and just special cases where
6940 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6941 the weak definitions (that can be overwritten at linktime by other
6942 definition from different object file) and when resolution info is available
6943 we simply use the knowledge passed to us by linker plugin. */
6945 decl_binds_to_current_def_p (const_tree decl
)
6947 gcc_assert (DECL_P (decl
));
6948 if (!targetm
.binds_local_p (decl
))
6950 if (!TREE_PUBLIC (decl
))
6953 /* When resolution is available, just use it. */
6954 if (symtab_node
*node
= symtab_node::get (decl
))
6956 if (node
->resolution
!= LDPR_UNKNOWN
)
6957 return resolution_to_local_definition_p (node
->resolution
);
6960 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6961 binds locally but still can be overwritten), DECL_COMMON (can be merged
6962 with a non-common definition somewhere in the same module) or
6964 This rely on fact that binds_local_p behave as decl_replaceable_p
6965 for all other declaration types. */
6966 if (DECL_WEAK (decl
))
6968 if (DECL_COMMON (decl
)
6969 && (DECL_INITIAL (decl
) == NULL
6970 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6972 if (DECL_EXTERNAL (decl
))
6977 /* A replaceable function or variable is one which may be replaced
6978 at link-time with an entirely different definition, provided that the
6979 replacement has the same type. For example, functions declared
6980 with __attribute__((weak)) on most systems are replaceable.
6982 COMDAT functions are not replaceable, since all definitions of the
6983 function must be equivalent. It is important that COMDAT functions
6984 not be treated as replaceable so that use of C++ template
6985 instantiations is not penalized. */
6988 decl_replaceable_p (tree decl
)
6990 gcc_assert (DECL_P (decl
));
6991 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
6993 if (!flag_semantic_interposition
6994 && !DECL_WEAK (decl
))
6996 return !decl_binds_to_current_def_p (decl
);
6999 /* Default function to output code that will globalize a label. A
7000 target must define GLOBAL_ASM_OP or provide its own function to
7001 globalize a label. */
7002 #ifdef GLOBAL_ASM_OP
7004 default_globalize_label (FILE * stream
, const char *name
)
7006 fputs (GLOBAL_ASM_OP
, stream
);
7007 assemble_name (stream
, name
);
7008 putc ('\n', stream
);
7010 #endif /* GLOBAL_ASM_OP */
7012 /* Default function to output code that will globalize a declaration. */
7014 default_globalize_decl_name (FILE * stream
, tree decl
)
7016 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
7017 targetm
.asm_out
.globalize_label (stream
, name
);
7020 /* Default function to output a label for unwind information. The
7021 default is to do nothing. A target that needs nonlocal labels for
7022 unwind information must provide its own function to do this. */
7024 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
7025 tree decl ATTRIBUTE_UNUSED
,
7026 int for_eh ATTRIBUTE_UNUSED
,
7027 int empty ATTRIBUTE_UNUSED
)
7031 /* Default function to output a label to divide up the exception table.
7032 The default is to do nothing. A target that needs/wants to divide
7033 up the table must provide it's own function to do this. */
7035 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
7039 /* This is how to output an internal numbered label where PREFIX is
7040 the class of label and LABELNO is the number within the class. */
7043 default_generate_internal_label (char *buf
, const char *prefix
,
7044 unsigned long labelno
)
7046 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7049 /* This is how to output an internal numbered label where PREFIX is
7050 the class of label and LABELNO is the number within the class. */
7053 default_internal_label (FILE *stream
, const char *prefix
,
7054 unsigned long labelno
)
7056 char *const buf
= (char *) alloca (40 + strlen (prefix
));
7057 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7058 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
7062 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
7065 default_asm_declare_constant_name (FILE *file
, const char *name
,
7066 const_tree exp ATTRIBUTE_UNUSED
,
7067 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
7069 assemble_label (file
, name
);
7072 /* This is the default behavior at the beginning of a file. It's
7073 controlled by two other target-hook toggles. */
7075 default_file_start (void)
7077 if (targetm
.asm_file_start_app_off
7078 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
7079 fputs (ASM_APP_OFF
, asm_out_file
);
7081 if (targetm
.asm_file_start_file_directive
)
7083 /* LTO produced units have no meaningful main_input_filename. */
7085 output_file_directive (asm_out_file
, "<artificial>");
7087 output_file_directive (asm_out_file
, main_input_filename
);
7091 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
7092 which emits a special section directive used to indicate whether or
7093 not this object file needs an executable stack. This is primarily
7094 a GNU extension to ELF but could be used on other targets. */
7096 int trampolines_created
;
7099 file_end_indicate_exec_stack (void)
7101 unsigned int flags
= SECTION_DEBUG
;
7102 if (trampolines_created
)
7103 flags
|= SECTION_CODE
;
7105 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
7108 /* Emit a special section directive to indicate that this object file
7109 was compiled with -fsplit-stack. This is used to let the linker
7110 detect calls between split-stack code and non-split-stack code, so
7111 that it can modify the split-stack code to allocate a sufficiently
7112 large stack. We emit another special section if there are any
7113 functions in this file which have the no_split_stack attribute, to
7114 prevent the linker from warning about being unable to convert the
7115 functions if they call non-split-stack code. */
7118 file_end_indicate_split_stack (void)
7120 if (flag_split_stack
)
7122 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
7124 if (saw_no_split_stack
)
7125 switch_to_section (get_section (".note.GNU-no-split-stack",
7126 SECTION_DEBUG
, NULL
));
7130 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
7131 a get_unnamed_section callback. */
7134 output_section_asm_op (const void *directive
)
7136 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
7139 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
7140 the current section is NEW_SECTION. */
7143 switch_to_section (section
*new_section
)
7145 if (in_section
== new_section
)
7148 if (new_section
->common
.flags
& SECTION_FORGET
)
7151 in_section
= new_section
;
7153 switch (SECTION_STYLE (new_section
))
7156 targetm
.asm_out
.named_section (new_section
->named
.name
,
7157 new_section
->named
.common
.flags
,
7158 new_section
->named
.decl
);
7161 case SECTION_UNNAMED
:
7162 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
7165 case SECTION_NOSWITCH
:
7170 new_section
->common
.flags
|= SECTION_DECLARED
;
7173 /* If block symbol SYMBOL has not yet been assigned an offset, place
7174 it at the end of its block. */
7177 place_block_symbol (rtx symbol
)
7179 unsigned HOST_WIDE_INT size
, mask
, offset
;
7180 struct constant_descriptor_rtx
*desc
;
7181 unsigned int alignment
;
7182 struct object_block
*block
;
7185 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7186 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7189 /* Work out the symbol's size and alignment. */
7190 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7192 desc
= SYMBOL_REF_CONSTANT (symbol
);
7193 alignment
= desc
->align
;
7194 size
= GET_MODE_SIZE (desc
->mode
);
7196 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7198 decl
= SYMBOL_REF_DECL (symbol
);
7199 gcc_checking_assert (DECL_IN_CONSTANT_POOL (decl
));
7200 alignment
= DECL_ALIGN (decl
);
7201 size
= get_constant_size (DECL_INITIAL (decl
));
7202 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7203 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7204 && asan_protect_global (DECL_INITIAL (decl
)))
7205 size
+= asan_red_zone_size (size
);
7209 struct symtab_node
*snode
;
7210 decl
= SYMBOL_REF_DECL (symbol
);
7212 snode
= symtab_node::get (decl
);
7215 rtx target
= DECL_RTL (snode
->ultimate_alias_target ()->decl
);
7217 gcc_assert (MEM_P (target
)
7218 && GET_CODE (XEXP (target
, 0)) == SYMBOL_REF
7219 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (target
, 0)));
7220 target
= XEXP (target
, 0);
7221 place_block_symbol (target
);
7222 SYMBOL_REF_BLOCK_OFFSET (symbol
) = SYMBOL_REF_BLOCK_OFFSET (target
);
7225 alignment
= get_variable_align (decl
);
7226 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7227 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7228 && asan_protect_global (decl
))
7230 size
+= asan_red_zone_size (size
);
7231 alignment
= MAX (alignment
,
7232 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7236 /* Calculate the object's offset from the start of the block. */
7237 block
= SYMBOL_REF_BLOCK (symbol
);
7238 mask
= alignment
/ BITS_PER_UNIT
- 1;
7239 offset
= (block
->size
+ mask
) & ~mask
;
7240 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7242 /* Record the block's new alignment and size. */
7243 block
->alignment
= MAX (block
->alignment
, alignment
);
7244 block
->size
= offset
+ size
;
7246 vec_safe_push (block
->objects
, symbol
);
7249 /* Return the anchor that should be used to address byte offset OFFSET
7250 from the first object in BLOCK. MODEL is the TLS model used
7254 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7255 enum tls_model model
)
7258 unsigned int begin
, middle
, end
;
7259 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7262 /* Work out the anchor's offset. Use an offset of 0 for the first
7263 anchor so that we don't pessimize the case where we take the address
7264 of a variable at the beginning of the block. This is particularly
7265 useful when a block has only one variable assigned to it.
7267 We try to place anchors RANGE bytes apart, so there can then be
7268 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7269 a ptr_mode offset. With some target settings, the lowest such
7270 anchor might be out of range for the lowest ptr_mode offset;
7271 likewise the highest anchor for the highest offset. Use anchors
7272 at the extreme ends of the ptr_mode range in such cases.
7274 All arithmetic uses unsigned integers in order to avoid
7276 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7277 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7278 range
= max_offset
- min_offset
+ 1;
7283 bias
= HOST_WIDE_INT_1U
<< (GET_MODE_BITSIZE (ptr_mode
) - 1);
7286 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7287 delta
-= delta
% range
;
7290 offset
= (HOST_WIDE_INT
) (-delta
);
7294 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7295 delta
-= delta
% range
;
7296 if (delta
> bias
- 1)
7298 offset
= (HOST_WIDE_INT
) delta
;
7302 /* Do a binary search to see if there's already an anchor we can use.
7303 Set BEGIN to the new anchor's index if not. */
7305 end
= vec_safe_length (block
->anchors
);
7306 while (begin
!= end
)
7308 middle
= (end
+ begin
) / 2;
7309 anchor
= (*block
->anchors
)[middle
];
7310 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7312 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7314 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7316 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7322 /* Create a new anchor with a unique label. */
7323 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7324 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7325 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7326 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7328 /* Insert it at index BEGIN. */
7329 vec_safe_insert (block
->anchors
, begin
, anchor
);
7333 /* Output the objects in BLOCK. */
7336 output_object_block (struct object_block
*block
)
7338 struct constant_descriptor_rtx
*desc
;
7340 HOST_WIDE_INT offset
;
7344 if (!block
->objects
)
7347 /* Switch to the section and make sure that the first byte is
7348 suitably aligned. */
7349 switch_to_section (block
->sect
);
7350 assemble_align (block
->alignment
);
7352 /* Define the values of all anchors relative to the current section
7354 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7355 targetm
.asm_out
.output_anchor (symbol
);
7357 /* Output the objects themselves. */
7359 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7361 /* Move to the object's offset, padding with zeros if necessary. */
7362 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7363 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7364 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7366 desc
= SYMBOL_REF_CONSTANT (symbol
);
7367 /* Pass 1 for align as we have already laid out everything in the block.
7368 So aligning shouldn't be necessary. */
7369 output_constant_pool_1 (desc
, 1);
7370 offset
+= GET_MODE_SIZE (desc
->mode
);
7372 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7375 decl
= SYMBOL_REF_DECL (symbol
);
7376 assemble_constant_contents
7377 (DECL_INITIAL (decl
), XSTR (symbol
, 0), DECL_ALIGN (decl
));
7379 size
= get_constant_size (DECL_INITIAL (decl
));
7381 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7382 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7383 && asan_protect_global (DECL_INITIAL (decl
)))
7385 size
= asan_red_zone_size (size
);
7386 assemble_zeros (size
);
7393 decl
= SYMBOL_REF_DECL (symbol
);
7394 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7395 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7397 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7398 && asan_protect_global (decl
))
7400 size
= asan_red_zone_size (size
);
7401 assemble_zeros (size
);
7408 /* A callback for qsort to compare object_blocks. */
7411 output_object_block_compare (const void *x
, const void *y
)
7413 object_block
*p1
= *(object_block
* const*)x
;
7414 object_block
*p2
= *(object_block
* const*)y
;
7416 if (p1
->sect
->common
.flags
& SECTION_NAMED
7417 && !(p2
->sect
->common
.flags
& SECTION_NAMED
))
7420 if (!(p1
->sect
->common
.flags
& SECTION_NAMED
)
7421 && p2
->sect
->common
.flags
& SECTION_NAMED
)
7424 if (p1
->sect
->common
.flags
& SECTION_NAMED
7425 && p2
->sect
->common
.flags
& SECTION_NAMED
)
7426 return strcmp (p1
->sect
->named
.name
, p2
->sect
->named
.name
);
7428 unsigned f1
= p1
->sect
->common
.flags
;
7429 unsigned f2
= p2
->sect
->common
.flags
;
7432 return f1
< f2
? -1 : 1;
7435 /* Output the definitions of all object_blocks. */
7438 output_object_blocks (void)
7440 vec
<object_block
*, va_heap
> v
;
7441 v
.create (object_block_htab
->elements ());
7443 hash_table
<object_block_hasher
>::iterator hi
;
7445 FOR_EACH_HASH_TABLE_ELEMENT (*object_block_htab
, obj
, object_block
*, hi
)
7448 /* Sort them in order to output them in a deterministic manner,
7449 otherwise we may get .rodata sections in different orders with
7451 v
.qsort (output_object_block_compare
);
7453 FOR_EACH_VEC_ELT (v
, i
, obj
)
7454 output_object_block (obj
);
7459 /* This function provides a possible implementation of the
7460 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7461 by -frecord-gcc-switches it creates a new mergeable, string section in the
7462 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7463 contains the switches in ASCII format.
7465 FIXME: This code does not correctly handle double quote characters
7466 that appear inside strings, (it strips them rather than preserving them).
7467 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7468 characters - instead it treats them as sub-string separators. Since
7469 we want to emit NUL strings terminators into the object file we have to use
7473 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7477 case SWITCH_TYPE_PASSED
:
7478 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7479 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7482 case SWITCH_TYPE_DESCRIPTIVE
:
7485 /* Distinguish between invocations where name is NULL. */
7486 static bool started
= false;
7492 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7496 | (SECTION_ENTSIZE
& 1),
7498 switch_to_section (sec
);
7507 /* The return value is currently ignored by the caller, but must be 0.
7508 For -fverbose-asm the return value would be the number of characters
7509 emitted into the assembler file. */
7513 /* Emit text to declare externally defined symbols. It is needed to
7514 properly support non-default visibility. */
7516 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7518 const char *name ATTRIBUTE_UNUSED
)
7520 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7521 set in order to avoid putting out names that are never really
7522 used. Always output visibility specified in the source. */
7523 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7524 && (DECL_VISIBILITY_SPECIFIED (decl
)
7525 || targetm
.binds_local_p (decl
)))
7526 maybe_assemble_visibility (decl
);
7529 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7532 default_asm_output_source_filename (FILE *file
, const char *name
)
7534 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7535 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7537 fprintf (file
, "\t.file\t");
7538 output_quoted_string (file
, name
);
7543 /* Output a file name in the form wanted by System V. */
7546 output_file_directive (FILE *asm_file
, const char *input_name
)
7551 if (input_name
== NULL
)
7552 input_name
= "<stdin>";
7554 input_name
= remap_debug_filename (input_name
);
7556 len
= strlen (input_name
);
7557 na
= input_name
+ len
;
7559 /* NA gets INPUT_NAME sans directory names. */
7560 while (na
> input_name
)
7562 if (IS_DIR_SEPARATOR (na
[-1]))
7567 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7570 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7573 make_debug_expr_from_rtl (const_rtx exp
)
7575 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7576 machine_mode mode
= GET_MODE (exp
);
7579 DECL_ARTIFICIAL (ddecl
) = 1;
7580 if (REG_P (exp
) && REG_EXPR (exp
))
7581 type
= TREE_TYPE (REG_EXPR (exp
));
7582 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7583 type
= TREE_TYPE (MEM_EXPR (exp
));
7586 if (type
&& TYPE_MODE (type
) == mode
)
7587 TREE_TYPE (ddecl
) = type
;
7589 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7590 DECL_MODE (ddecl
) = mode
;
7591 dval
= gen_rtx_DEBUG_EXPR (mode
);
7592 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7593 SET_DECL_RTL (ddecl
, dval
);
7597 #ifdef ELF_ASCII_ESCAPES
7598 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7601 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7606 fputs (STRING_ASM_OP
, f
);
7611 escape
= ELF_ASCII_ESCAPES
[c
];
7618 /* TODO: Print in hex with fast function, important for -flto. */
7619 fprintf (f
, "\\%03o", c
);
7632 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7635 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7637 const char *limit
= s
+ len
;
7638 const char *last_null
= NULL
;
7639 unsigned bytes_in_chunk
= 0;
7643 for (; s
< limit
; s
++)
7647 if (bytes_in_chunk
>= 60)
7656 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7663 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7665 if (bytes_in_chunk
> 0)
7672 default_elf_asm_output_limited_string (f
, s
);
7677 if (bytes_in_chunk
== 0)
7678 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7681 escape
= ELF_ASCII_ESCAPES
[c
];
7689 /* TODO: Print in hex with fast function, important for -flto. */
7690 fprintf (f
, "\\%03o", c
);
7691 bytes_in_chunk
+= 4;
7696 bytes_in_chunk
+= 2;
7703 if (bytes_in_chunk
> 0)
7711 static GTY(()) section
*elf_init_array_section
;
7712 static GTY(()) section
*elf_fini_array_section
;
7715 get_elf_initfini_array_priority_section (int priority
,
7719 if (priority
!= DEFAULT_INIT_PRIORITY
)
7722 sprintf (buf
, "%s.%.5u",
7723 constructor_p
? ".init_array" : ".fini_array",
7725 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7731 if (elf_init_array_section
== NULL
)
7732 elf_init_array_section
7733 = get_section (".init_array",
7734 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7735 sec
= elf_init_array_section
;
7739 if (elf_fini_array_section
== NULL
)
7740 elf_fini_array_section
7741 = get_section (".fini_array",
7742 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7743 sec
= elf_fini_array_section
;
7749 /* Use .init_array section for constructors. */
7752 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7754 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7756 assemble_addr_to_section (symbol
, sec
);
7759 /* Use .fini_array section for destructors. */
7762 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7764 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7766 assemble_addr_to_section (symbol
, sec
);
7769 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7771 This is a bit of a cheat. The real default is a no-op, but this
7772 hook is the default for all targets with a .ident directive. */
7775 default_asm_output_ident_directive (const char *ident_str
)
7777 const char *ident_asm_op
= "\t.ident\t";
7779 /* If we are still in the front end, do not write out the string
7780 to asm_out_file. Instead, add a fake top-level asm statement.
7781 This allows the front ends to use this hook without actually
7782 writing to asm_out_file, to handle #ident or Pragma Ident. */
7783 if (symtab
->state
== PARSING
)
7785 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7786 symtab
->finalize_toplevel_asm (build_string (strlen (buf
), buf
));
7789 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7792 #include "gt-varasm.h"