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 "double-int.h"
43 #include "fold-const.h"
44 #include "stor-layout.h"
45 #include "stringpool.h"
48 #include "hard-reg-set.h"
51 #include "statistics.h"
53 #include "fixed-value.h"
54 #include "insn-config.h"
64 #include "diagnostic-core.h"
66 #include "langhooks.h"
70 #include "common/common-target.h"
71 #include "targhooks.h"
73 #include "dominance.h"
75 #include "basic-block.h"
78 #include "plugin-api.h"
83 #include "tree-chkp.h"
85 #ifdef XCOFF_DEBUGGING_INFO
86 #include "xcoffout.h" /* Needed for external data
87 declarations for e.g. AIX 4.x. */
90 /* The (assembler) name of the first globally-visible object output. */
91 extern GTY(()) const char *first_global_object_name
;
92 extern GTY(()) const char *weak_global_object_name
;
94 const char *first_global_object_name
;
95 const char *weak_global_object_name
;
98 struct constant_descriptor_rtx
;
99 struct rtx_constant_pool
;
101 #define n_deferred_constants (crtl->varasm.deferred_constants)
103 /* Number for making the label on the next
104 constant that is stored in memory. */
106 static GTY(()) int const_labelno
;
108 /* Carry information from ASM_DECLARE_OBJECT_NAME
109 to ASM_FINISH_DECLARE_OBJECT. */
111 int size_directive_output
;
113 /* The last decl for which assemble_variable was called,
114 if it did ASM_DECLARE_OBJECT_NAME.
115 If the last call to assemble_variable didn't do that,
118 tree last_assemble_variable_decl
;
120 /* The following global variable indicates if the first basic block
121 in a function belongs to the cold partition or not. */
123 bool first_function_block_is_cold
;
125 /* Whether we saw any functions with no_split_stack. */
127 static bool saw_no_split_stack
;
129 static const char *strip_reg_name (const char *);
130 static int contains_pointers_p (tree
);
131 #ifdef ASM_OUTPUT_EXTERNAL
132 static bool incorporeal_function_p (tree
);
134 static void decode_addr_const (tree
, struct addr_const
*);
135 static hashval_t
const_hash_1 (const tree
);
136 static int compare_constant (const tree
, const tree
);
137 static void output_constant_def_contents (rtx
);
138 static void output_addressed_constants (tree
);
139 static unsigned HOST_WIDE_INT
output_constant (tree
, unsigned HOST_WIDE_INT
,
141 static void globalize_decl (tree
);
142 static bool decl_readonly_section_1 (enum section_category
);
143 #ifdef BSS_SECTION_ASM_OP
144 #ifdef ASM_OUTPUT_ALIGNED_BSS
145 static void asm_output_aligned_bss (FILE *, tree
, const char *,
146 unsigned HOST_WIDE_INT
, int)
149 #endif /* BSS_SECTION_ASM_OP */
150 static void mark_weak (tree
);
151 static void output_constant_pool (const char *, tree
);
153 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
154 section
*text_section
;
155 section
*data_section
;
156 section
*readonly_data_section
;
157 section
*sdata_section
;
158 section
*ctors_section
;
159 section
*dtors_section
;
160 section
*bss_section
;
161 section
*sbss_section
;
163 /* Various forms of common section. All are guaranteed to be nonnull. */
164 section
*tls_comm_section
;
165 section
*comm_section
;
166 section
*lcomm_section
;
168 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
170 section
*bss_noswitch_section
;
172 /* The section that holds the main exception table, when known. The section
173 is set either by the target's init_sections hook or by the first call to
174 switch_to_exception_section. */
175 section
*exception_section
;
177 /* The section that holds the DWARF2 frame unwind information, when known.
178 The section is set either by the target's init_sections hook or by the
179 first call to switch_to_eh_frame_section. */
180 section
*eh_frame_section
;
182 /* asm_out_file's current section. This is NULL if no section has yet
183 been selected or if we lose track of what the current section is. */
186 /* True if code for the current function is currently being directed
187 at the cold section. */
188 bool in_cold_section_p
;
190 /* A linked list of all the unnamed sections. */
191 static GTY(()) section
*unnamed_sections
;
193 /* Return a nonzero value if DECL has a section attribute. */
194 #define IN_NAMED_SECTION(DECL) \
195 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
196 && DECL_SECTION_NAME (DECL) != NULL)
198 struct section_hasher
: ggc_hasher
<section
*>
200 typedef const char *compare_type
;
202 static hashval_t
hash (section
*);
203 static bool equal (section
*, const char *);
206 /* Hash table of named sections. */
207 static GTY(()) hash_table
<section_hasher
> *section_htab
;
209 struct object_block_hasher
: ggc_hasher
<object_block
*>
211 typedef const section
*compare_type
;
213 static hashval_t
hash (object_block
*);
214 static bool equal (object_block
*, const section
*);
217 /* A table of object_blocks, indexed by section. */
218 static GTY(()) hash_table
<object_block_hasher
> *object_block_htab
;
220 /* The next number to use for internal anchor labels. */
221 static GTY(()) int anchor_labelno
;
223 /* A pool of constants that can be shared between functions. */
224 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
226 /* Helper routines for maintaining section_htab. */
229 section_hasher::equal (section
*old
, const char *new_name
)
231 return strcmp (old
->named
.name
, new_name
) == 0;
235 section_hasher::hash (section
*old
)
237 return htab_hash_string (old
->named
.name
);
240 /* Return a hash value for section SECT. */
243 hash_section (section
*sect
)
245 if (sect
->common
.flags
& SECTION_NAMED
)
246 return htab_hash_string (sect
->named
.name
);
247 return sect
->common
.flags
;
250 /* Helper routines for maintaining object_block_htab. */
253 object_block_hasher::equal (object_block
*old
, const section
*new_section
)
255 return old
->sect
== new_section
;
259 object_block_hasher::hash (object_block
*old
)
261 return hash_section (old
->sect
);
264 /* Return a new unnamed section with the given fields. */
267 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
272 sect
= ggc_alloc
<section
> ();
273 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
274 sect
->unnamed
.callback
= callback
;
275 sect
->unnamed
.data
= data
;
276 sect
->unnamed
.next
= unnamed_sections
;
278 unnamed_sections
= sect
;
282 /* Return a SECTION_NOSWITCH section with the given fields. */
285 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
289 sect
= ggc_alloc
<section
> ();
290 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
291 sect
->noswitch
.callback
= callback
;
296 /* Return the named section structure associated with NAME. Create
297 a new section with the given fields if no such structure exists. */
300 get_section (const char *name
, unsigned int flags
, tree decl
)
302 section
*sect
, **slot
;
304 slot
= section_htab
->find_slot_with_hash (name
, htab_hash_string (name
),
306 flags
|= SECTION_NAMED
;
309 sect
= ggc_alloc
<section
> ();
310 sect
->named
.common
.flags
= flags
;
311 sect
->named
.name
= ggc_strdup (name
);
312 sect
->named
.decl
= decl
;
318 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
319 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
321 /* It is fine if one of the section flags is
322 SECTION_WRITE | SECTION_RELRO and the other has none of these
323 flags (i.e. read-only) in named sections and either the
324 section hasn't been declared yet or has been declared as writable.
325 In that case just make sure the resulting flags are
326 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
328 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
329 == (SECTION_WRITE
| SECTION_RELRO
)
330 && (sect
->common
.flags
331 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
332 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
333 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
334 || (sect
->common
.flags
& SECTION_WRITE
)))
336 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
339 /* Sanity check user variables for flag changes. */
340 if (sect
->named
.decl
!= NULL
341 && DECL_P (sect
->named
.decl
)
342 && decl
!= sect
->named
.decl
)
344 if (decl
!= NULL
&& DECL_P (decl
))
345 error ("%+D causes a section type conflict with %D",
346 decl
, sect
->named
.decl
);
348 error ("section type conflict with %D", sect
->named
.decl
);
349 inform (DECL_SOURCE_LOCATION (sect
->named
.decl
),
350 "%qD was declared here", sect
->named
.decl
);
352 else if (decl
!= NULL
&& DECL_P (decl
))
353 error ("%+D causes a section type conflict", decl
);
355 error ("section type conflict");
356 /* Make sure we don't error about one section multiple times. */
357 sect
->common
.flags
|= SECTION_OVERRIDE
;
363 /* Return true if the current compilation mode benefits from having
364 objects grouped into blocks. */
367 use_object_blocks_p (void)
369 return flag_section_anchors
;
372 /* Return the object_block structure for section SECT. Create a new
373 structure if we haven't created one already. Return null if SECT
376 static struct object_block
*
377 get_block_for_section (section
*sect
)
379 struct object_block
*block
;
385 = object_block_htab
->find_slot_with_hash (sect
, hash_section (sect
),
390 block
= ggc_cleared_alloc
<object_block
> ();
397 /* Create a symbol with label LABEL and place it at byte offset
398 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
399 is not yet known. LABEL must be a garbage-collected string. */
402 create_block_symbol (const char *label
, struct object_block
*block
,
403 HOST_WIDE_INT offset
)
408 /* Create the extended SYMBOL_REF. */
409 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
410 symbol
= (rtx
) ggc_internal_alloc (size
);
412 /* Initialize the normal SYMBOL_REF fields. */
413 memset (symbol
, 0, size
);
414 PUT_CODE (symbol
, SYMBOL_REF
);
415 PUT_MODE (symbol
, Pmode
);
416 XSTR (symbol
, 0) = label
;
417 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
419 /* Initialize the block_symbol stuff. */
420 SYMBOL_REF_BLOCK (symbol
) = block
;
421 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
426 /* Return a section with a particular name and with whatever SECTION_*
427 flags section_type_flags deems appropriate. The name of the section
428 is taken from NAME if nonnull, otherwise it is taken from DECL's
429 DECL_SECTION_NAME. DECL is the decl associated with the section
430 (see the section comment for details) and RELOC is as for
431 section_type_flags. */
434 get_named_section (tree decl
, const char *name
, int reloc
)
440 gcc_assert (decl
&& DECL_P (decl
) && DECL_SECTION_NAME (decl
));
441 name
= DECL_SECTION_NAME (decl
);
444 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
445 return get_section (name
, flags
, decl
);
448 /* Worker for resolve_unique_section. */
451 set_implicit_section (struct symtab_node
*n
, void *data ATTRIBUTE_UNUSED
)
453 n
->implicit_section
= true;
457 /* If required, set DECL_SECTION_NAME to a unique name. */
460 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
461 int flag_function_or_data_sections
)
463 if (DECL_SECTION_NAME (decl
) == NULL
464 && targetm_common
.have_named_sections
465 && (flag_function_or_data_sections
466 || DECL_COMDAT_GROUP (decl
)))
468 targetm
.asm_out
.unique_section (decl
, reloc
);
469 if (DECL_SECTION_NAME (decl
))
470 symtab_node::get (decl
)->call_for_symbol_and_aliases
471 (set_implicit_section
, NULL
, true);
475 #ifdef BSS_SECTION_ASM_OP
477 #ifdef ASM_OUTPUT_ALIGNED_BSS
479 /* Utility function for targets to use in implementing
480 ASM_OUTPUT_ALIGNED_BSS.
481 ??? It is believed that this function will work in most cases so such
482 support is localized here. */
485 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
486 const char *name
, unsigned HOST_WIDE_INT size
,
489 switch_to_section (bss_section
);
490 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
491 #ifdef ASM_DECLARE_OBJECT_NAME
492 last_assemble_variable_decl
= decl
;
493 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
495 /* Standard thing is just output label for the object. */
496 ASM_OUTPUT_LABEL (file
, name
);
497 #endif /* ASM_DECLARE_OBJECT_NAME */
498 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
503 #endif /* BSS_SECTION_ASM_OP */
505 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
506 /* Return the hot section for function DECL. Return text_section for
510 hot_function_section (tree decl
)
512 if (decl
!= NULL_TREE
513 && DECL_SECTION_NAME (decl
) != NULL
514 && targetm_common
.have_named_sections
)
515 return get_named_section (decl
, NULL
, 0);
521 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
524 When DECL_SECTION_NAME is non-NULL and it is implicit section and
525 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
526 concatenate the name with NAMED_SECTION_SUFFIX.
527 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
530 get_named_text_section (tree decl
,
531 const char *text_section_name
,
532 const char *named_section_suffix
)
534 if (decl
&& DECL_SECTION_NAME (decl
))
536 if (named_section_suffix
)
538 const char *dsn
= DECL_SECTION_NAME (decl
);
539 const char *stripped_name
;
542 name
= (char *) alloca (strlen (dsn
) + 1);
546 stripped_name
= targetm
.strip_name_encoding (name
);
548 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
549 return get_named_section (decl
, buffer
, 0);
551 else if (symtab_node::get (decl
)->implicit_section
)
555 /* Do not try to split gnu_linkonce functions. This gets somewhat
557 if (DECL_COMDAT_GROUP (decl
) && !HAVE_COMDAT_GROUP
)
559 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
560 name
= targetm
.strip_name_encoding (name
);
561 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
567 return get_named_section (decl
, text_section_name
, 0);
570 /* Choose named function section based on its frequency. */
573 default_function_section (tree decl
, enum node_frequency freq
,
574 bool startup
, bool exit
)
576 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
577 /* Old GNU linkers have buggy --gc-section support, which sometimes
578 results in .gcc_except_table* sections being garbage collected. */
580 && symtab_node::get (decl
)->implicit_section
)
584 if (!flag_reorder_functions
585 || !targetm_common
.have_named_sections
)
587 /* Startup code should go to startup subsection unless it is
588 unlikely executed (this happens especially with function splitting
589 where we can split away unnecessary parts of static constructors. */
590 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
592 /* If we do have a profile or(and) LTO phase is executed, we do not need
593 these ELF section. */
594 if (!in_lto_p
|| !flag_profile_values
)
595 return get_named_text_section (decl
, ".text.startup", NULL
);
600 /* Similarly for exit. */
601 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
602 return get_named_text_section (decl
, ".text.exit", NULL
);
604 /* Group cold functions together, similarly for hot code. */
607 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
608 return get_named_text_section (decl
, ".text.unlikely", NULL
);
609 case NODE_FREQUENCY_HOT
:
610 /* If we do have a profile or(and) LTO phase is executed, we do not need
611 these ELF section. */
612 if (!in_lto_p
|| !flag_profile_values
)
613 return get_named_text_section (decl
, ".text.hot", NULL
);
619 /* Return the section for function DECL.
621 If DECL is NULL_TREE, return the text section. We can be passed
622 NULL_TREE under some circumstances by dbxout.c at least.
624 If FORCE_COLD is true, return cold function section ignoring
625 the frequency info of cgraph_node. */
628 function_section_1 (tree decl
, bool force_cold
)
630 section
*section
= NULL
;
631 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
632 bool startup
= false, exit
= false;
636 struct cgraph_node
*node
= cgraph_node::get (decl
);
640 freq
= node
->frequency
;
641 startup
= node
->only_called_at_startup
;
642 exit
= node
->only_called_at_exit
;
646 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
648 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
649 if (decl
!= NULL_TREE
650 && DECL_SECTION_NAME (decl
) != NULL
)
652 if (targetm
.asm_out
.function_section
)
653 section
= targetm
.asm_out
.function_section (decl
, freq
,
657 return get_named_section (decl
, NULL
, 0);
660 return targetm
.asm_out
.select_section
661 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
664 if (targetm
.asm_out
.function_section
)
665 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
668 return hot_function_section (decl
);
672 /* Return the section for function DECL.
674 If DECL is NULL_TREE, return the text section. We can be passed
675 NULL_TREE under some circumstances by dbxout.c at least. */
678 function_section (tree decl
)
680 /* Handle cases where function splitting code decides
681 to put function entry point into unlikely executed section
682 despite the fact that the function itself is not cold
683 (i.e. it is called rarely but contains a hot loop that is
684 better to live in hot subsection for the code locality). */
685 return function_section_1 (decl
,
686 first_function_block_is_cold
);
689 /* Return the section for the current function, take IN_COLD_SECTION_P
693 current_function_section (void)
695 return function_section_1 (current_function_decl
, in_cold_section_p
);
698 /* Tell assembler to switch to unlikely-to-be-executed text section. */
701 unlikely_text_section (void)
703 return function_section_1 (current_function_decl
, true);
706 /* When called within a function context, return true if the function
707 has been assigned a cold text section and if SECT is that section.
708 When called outside a function context, return true if SECT is the
709 default cold section. */
712 unlikely_text_section_p (section
*sect
)
714 return sect
== function_section_1 (current_function_decl
, true);
717 /* Return the read-only data section associated with function DECL. */
720 default_function_rodata_section (tree decl
)
722 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
724 const char *name
= DECL_SECTION_NAME (decl
);
726 if (DECL_COMDAT_GROUP (decl
) && HAVE_COMDAT_GROUP
)
732 dot
= strchr (name
+ 1, '.');
735 len
= strlen (dot
) + 8;
736 rname
= (char *) alloca (len
);
738 strcpy (rname
, ".rodata");
740 return get_section (rname
, SECTION_LINKONCE
, decl
);
742 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
743 else if (DECL_COMDAT_GROUP (decl
)
744 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
746 size_t len
= strlen (name
) + 1;
747 char *rname
= (char *) alloca (len
);
749 memcpy (rname
, name
, len
);
751 return get_section (rname
, SECTION_LINKONCE
, decl
);
753 /* For .text.foo we want to use .rodata.foo. */
754 else if (flag_function_sections
&& flag_data_sections
755 && strncmp (name
, ".text.", 6) == 0)
757 size_t len
= strlen (name
) + 1;
758 char *rname
= (char *) alloca (len
+ 2);
760 memcpy (rname
, ".rodata", 7);
761 memcpy (rname
+ 7, name
+ 5, len
- 5);
762 return get_section (rname
, 0, decl
);
766 return readonly_data_section
;
769 /* Return the read-only data section associated with function DECL
770 for targets where that section should be always the single
771 readonly data section. */
774 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
776 return readonly_data_section
;
779 /* Return the section to use for string merging. */
782 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
783 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
784 unsigned int flags ATTRIBUTE_UNUSED
)
788 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
789 && TREE_CODE (decl
) == STRING_CST
790 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
792 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
793 && TREE_STRING_LENGTH (decl
) >= len
)
796 unsigned int modesize
;
800 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
801 char *name
= (char *) alloca (strlen (prefix
) + 30);
803 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
804 modesize
= GET_MODE_BITSIZE (mode
);
805 if (modesize
>= 8 && modesize
<= 256
806 && (modesize
& (modesize
- 1)) == 0)
808 if (align
< modesize
)
811 str
= TREE_STRING_POINTER (decl
);
812 unit
= GET_MODE_SIZE (mode
);
814 /* Check for embedded NUL characters. */
815 for (i
= 0; i
< len
; i
+= unit
)
817 for (j
= 0; j
< unit
; j
++)
818 if (str
[i
+ j
] != '\0')
825 sprintf (name
, "%s.str%d.%d", prefix
,
826 modesize
/ 8, (int) (align
/ 8));
827 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
828 return get_section (name
, flags
, NULL
);
833 return readonly_data_section
;
836 /* Return the section to use for constant merging. */
839 mergeable_constant_section (machine_mode mode ATTRIBUTE_UNUSED
,
840 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
841 unsigned int flags ATTRIBUTE_UNUSED
)
843 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
845 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
851 && (align
& (align
- 1)) == 0)
853 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
854 char *name
= (char *) alloca (strlen (prefix
) + 30);
856 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
857 flags
|= (align
/ 8) | SECTION_MERGE
;
858 return get_section (name
, flags
, NULL
);
860 return readonly_data_section
;
863 /* Given NAME, a putative register name, discard any customary prefixes. */
866 strip_reg_name (const char *name
)
868 #ifdef REGISTER_PREFIX
869 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
870 name
+= strlen (REGISTER_PREFIX
);
872 if (name
[0] == '%' || name
[0] == '#')
877 /* The user has asked for a DECL to have a particular name. Set (or
878 change) it in such a way that we don't prefix an underscore to
881 set_user_assembler_name (tree decl
, const char *name
)
883 char *starred
= (char *) alloca (strlen (name
) + 2);
885 strcpy (starred
+ 1, name
);
886 symtab
->change_decl_assembler_name (decl
, get_identifier (starred
));
887 SET_DECL_RTL (decl
, NULL_RTX
);
890 /* Decode an `asm' spec for a declaration as a register name.
891 Return the register number, or -1 if nothing specified,
892 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
893 or -3 if ASMSPEC is `cc' and is not recognized,
894 or -4 if ASMSPEC is `memory' and is not recognized.
895 Accept an exact spelling or a decimal number.
896 Prefixes such as % are optional. */
899 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
901 /* Presume just one register is clobbered. */
908 /* Get rid of confusing prefixes. */
909 asmspec
= strip_reg_name (asmspec
);
911 /* Allow a decimal number as a "register name". */
912 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
913 if (! ISDIGIT (asmspec
[i
]))
915 if (asmspec
[0] != 0 && i
< 0)
918 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0 && reg_names
[i
][0])
924 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
926 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
929 #ifdef OVERLAPPING_REGISTER_NAMES
933 const char *const name
;
936 } table
[] = OVERLAPPING_REGISTER_NAMES
;
938 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
940 && ! strcmp (asmspec
, table
[i
].name
))
942 *pnregs
= table
[i
].nregs
;
943 return table
[i
].number
;
946 #endif /* OVERLAPPING_REGISTER_NAMES */
948 #ifdef ADDITIONAL_REGISTER_NAMES
950 static const struct { const char *const name
; const int number
; } table
[]
951 = ADDITIONAL_REGISTER_NAMES
;
953 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
955 && ! strcmp (asmspec
, table
[i
].name
)
956 && reg_names
[table
[i
].number
][0])
957 return table
[i
].number
;
959 #endif /* ADDITIONAL_REGISTER_NAMES */
961 if (!strcmp (asmspec
, "memory"))
964 if (!strcmp (asmspec
, "cc"))
974 decode_reg_name (const char *name
)
977 return decode_reg_name_and_count (name
, &count
);
981 /* Return true if DECL's initializer is suitable for a BSS section. */
984 bss_initializer_p (const_tree decl
)
986 return (DECL_INITIAL (decl
) == NULL
987 /* In LTO we have no errors in program; error_mark_node is used
988 to mark offlined constructors. */
989 || (DECL_INITIAL (decl
) == error_mark_node
991 || (flag_zero_initialized_in_bss
992 /* Leave constant zeroes in .rodata so they
994 && !TREE_READONLY (decl
)
995 && initializer_zerop (DECL_INITIAL (decl
))));
998 /* Compute the alignment of variable specified by DECL.
999 DONT_OUTPUT_DATA is from assemble_variable. */
1002 align_variable (tree decl
, bool dont_output_data
)
1004 unsigned int align
= DECL_ALIGN (decl
);
1006 /* In the case for initialing an array whose length isn't specified,
1007 where we have not yet been able to do the layout,
1008 figure out the proper alignment now. */
1009 if (dont_output_data
&& DECL_SIZE (decl
) == 0
1010 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
1011 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
1013 /* Some object file formats have a maximum alignment which they support.
1014 In particular, a.out format supports a maximum alignment of 4. */
1015 if (align
> MAX_OFILE_ALIGNMENT
)
1017 error ("alignment of %q+D is greater than maximum object "
1018 "file alignment %d", decl
,
1019 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
1020 align
= MAX_OFILE_ALIGNMENT
;
1023 if (! DECL_USER_ALIGN (decl
))
1025 #ifdef DATA_ABI_ALIGNMENT
1026 unsigned int data_abi_align
1027 = DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1028 /* For backwards compatibility, don't assume the ABI alignment for
1030 if (! DECL_THREAD_LOCAL_P (decl
) || data_abi_align
<= BITS_PER_WORD
)
1031 align
= data_abi_align
;
1034 /* On some machines, it is good to increase alignment sometimes.
1035 But as DECL_ALIGN is used both for actually emitting the variable
1036 and for code accessing the variable as guaranteed alignment, we
1037 can only increase the alignment if it is a performance optimization
1038 if the references to it must bind to the current definition. */
1039 if (decl_binds_to_current_def_p (decl
)
1040 && !DECL_VIRTUAL_P (decl
))
1042 #ifdef DATA_ALIGNMENT
1043 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1044 /* Don't increase alignment too much for TLS variables - TLS space
1046 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1049 #ifdef CONSTANT_ALIGNMENT
1050 if (DECL_INITIAL (decl
) != 0
1051 /* In LTO we have no errors in program; error_mark_node is used
1052 to mark offlined constructors. */
1053 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1055 unsigned int const_align
1056 = CONSTANT_ALIGNMENT (DECL_INITIAL (decl
), align
);
1057 /* Don't increase alignment too much for TLS variables - TLS
1058 space is too precious. */
1059 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1060 align
= const_align
;
1066 /* Reset the alignment in case we have made it tighter, so we can benefit
1067 from it in get_pointer_alignment. */
1068 DECL_ALIGN (decl
) = align
;
1071 /* Return DECL_ALIGN (decl), possibly increased for optimization purposes
1072 beyond what align_variable returned. */
1075 get_variable_align (tree decl
)
1077 unsigned int align
= DECL_ALIGN (decl
);
1079 /* For user aligned vars or static vars align_variable already did
1081 if (DECL_USER_ALIGN (decl
) || !TREE_PUBLIC (decl
))
1084 #ifdef DATA_ABI_ALIGNMENT
1085 if (DECL_THREAD_LOCAL_P (decl
))
1086 align
= DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1089 /* For decls that bind to the current definition, align_variable
1090 did also everything, except for not assuming ABI required alignment
1091 of TLS variables. For other vars, increase the alignment here
1092 as an optimization. */
1093 if (!decl_binds_to_current_def_p (decl
))
1095 /* On some machines, it is good to increase alignment sometimes. */
1096 #ifdef DATA_ALIGNMENT
1097 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1098 /* Don't increase alignment too much for TLS variables - TLS space
1100 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1103 #ifdef CONSTANT_ALIGNMENT
1104 if (DECL_INITIAL (decl
) != 0
1105 /* In LTO we have no errors in program; error_mark_node is used
1106 to mark offlined constructors. */
1107 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1109 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
1111 /* Don't increase alignment too much for TLS variables - TLS space
1113 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1114 align
= const_align
;
1122 /* Return the section into which the given VAR_DECL or CONST_DECL
1123 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1124 section should be used wherever possible. */
1127 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1129 addr_space_t as
= ADDR_SPACE_GENERIC
;
1131 varpool_node
*vnode
= varpool_node::get (decl
);
1134 vnode
= vnode
->ultimate_alias_target ();
1138 if (TREE_TYPE (decl
) != error_mark_node
)
1139 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1141 /* We need the constructor to figure out reloc flag. */
1143 vnode
->get_constructor ();
1145 if (DECL_COMMON (decl
))
1147 /* If the decl has been given an explicit section name, or it resides
1148 in a non-generic address space, then it isn't common, and shouldn't
1149 be handled as such. */
1150 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1151 && ADDR_SPACE_GENERIC_P (as
));
1152 if (DECL_THREAD_LOCAL_P (decl
))
1153 return tls_comm_section
;
1154 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1155 return comm_section
;
1158 if (DECL_INITIAL (decl
) == error_mark_node
)
1159 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1160 else if (DECL_INITIAL (decl
))
1161 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1165 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1166 if (IN_NAMED_SECTION (decl
))
1167 return get_named_section (decl
, NULL
, reloc
);
1169 if (ADDR_SPACE_GENERIC_P (as
)
1170 && !DECL_THREAD_LOCAL_P (decl
)
1171 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1172 && bss_initializer_p (decl
))
1174 if (!TREE_PUBLIC (decl
)
1175 && !((flag_sanitize
& SANITIZE_ADDRESS
)
1176 && asan_protect_global (decl
)))
1177 return lcomm_section
;
1178 if (bss_noswitch_section
)
1179 return bss_noswitch_section
;
1182 return targetm
.asm_out
.select_section (decl
, reloc
,
1183 get_variable_align (decl
));
1186 /* Return the block into which object_block DECL should be placed. */
1188 static struct object_block
*
1189 get_block_for_decl (tree decl
)
1193 if (TREE_CODE (decl
) == VAR_DECL
)
1195 /* The object must be defined in this translation unit. */
1196 if (DECL_EXTERNAL (decl
))
1199 /* There's no point using object blocks for something that is
1200 isolated by definition. */
1201 if (DECL_COMDAT_GROUP (decl
))
1205 /* We can only calculate block offsets if the decl has a known
1207 if (DECL_SIZE_UNIT (decl
) == NULL
)
1209 if (!tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
)))
1212 /* Find out which section should contain DECL. We cannot put it into
1213 an object block if it requires a standalone definition. */
1214 if (TREE_CODE (decl
) == VAR_DECL
)
1215 align_variable (decl
, 0);
1216 sect
= get_variable_section (decl
, true);
1217 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1220 return get_block_for_section (sect
);
1223 /* Make sure block symbol SYMBOL is in block BLOCK. */
1226 change_symbol_block (rtx symbol
, struct object_block
*block
)
1228 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1230 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1231 SYMBOL_REF_BLOCK (symbol
) = block
;
1235 /* Return true if it is possible to put DECL in an object_block. */
1238 use_blocks_for_decl_p (tree decl
)
1240 struct symtab_node
*snode
;
1242 /* Only data DECLs can be placed into object blocks. */
1243 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1246 /* Detect decls created by dw2_force_const_mem. Such decls are
1247 special because DECL_INITIAL doesn't specify the decl's true value.
1248 dw2_output_indirect_constants will instead call assemble_variable
1249 with dont_output_data set to 1 and then print the contents itself. */
1250 if (DECL_INITIAL (decl
) == decl
)
1253 /* If this decl is an alias, then we don't want to emit a
1255 if (TREE_CODE (decl
) == VAR_DECL
1256 && (snode
= symtab_node::get (decl
)) != NULL
1260 return targetm
.use_blocks_for_decl_p (decl
);
1263 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
1264 until we find an identifier that is not itself a transparent alias.
1265 Modify the alias passed to it by reference (and all aliases on the
1266 way to the ultimate target), such that they do not have to be
1267 followed again, and return the ultimate target of the alias
1271 ultimate_transparent_alias_target (tree
*alias
)
1273 tree target
= *alias
;
1275 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
1277 gcc_assert (TREE_CHAIN (target
));
1278 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
1279 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
1280 && ! TREE_CHAIN (target
));
1287 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1288 have static storage duration. In other words, it should not be an
1289 automatic variable, including PARM_DECLs.
1291 There is, however, one exception: this function handles variables
1292 explicitly placed in a particular register by the user.
1294 This is never called for PARM_DECL nodes. */
1297 make_decl_rtl (tree decl
)
1299 const char *name
= 0;
1304 /* Check that we are not being given an automatic variable. */
1305 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1306 && TREE_CODE (decl
) != RESULT_DECL
);
1308 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1309 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1310 || TREE_STATIC (decl
)
1311 || TREE_PUBLIC (decl
)
1312 || DECL_EXTERNAL (decl
)
1313 || DECL_REGISTER (decl
));
1315 /* And that we were not given a type or a label. */
1316 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1317 && TREE_CODE (decl
) != LABEL_DECL
);
1319 /* For a duplicate declaration, we can be called twice on the
1320 same DECL node. Don't discard the RTL already made. */
1321 if (DECL_RTL_SET_P (decl
))
1323 /* If the old RTL had the wrong mode, fix the mode. */
1324 x
= DECL_RTL (decl
);
1325 if (GET_MODE (x
) != DECL_MODE (decl
))
1326 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1328 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1331 /* ??? Another way to do this would be to maintain a hashed
1332 table of such critters. Instead of adding stuff to a DECL
1333 to give certain attributes to it, we could use an external
1334 hash map from DECL to set of attributes. */
1336 /* Let the target reassign the RTL if it wants.
1337 This is necessary, for example, when one machine specific
1338 decl attribute overrides another. */
1339 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1341 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1342 on the new decl information. */
1344 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1345 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1346 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1351 /* If this variable belongs to the global constant pool, retrieve the
1352 pre-computed RTL or recompute it in LTO mode. */
1353 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_IN_CONSTANT_POOL (decl
))
1355 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1359 id
= DECL_ASSEMBLER_NAME (decl
);
1360 if (TREE_CODE (decl
) == FUNCTION_DECL
1361 && cgraph_node::get (decl
)
1362 && cgraph_node::get (decl
)->instrumentation_clone
)
1363 ultimate_transparent_alias_target (&id
);
1364 name
= IDENTIFIER_POINTER (id
);
1366 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1367 && DECL_REGISTER (decl
))
1369 error ("register name not specified for %q+D", decl
);
1371 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1373 const char *asmspec
= name
+1;
1374 machine_mode mode
= DECL_MODE (decl
);
1375 reg_number
= decode_reg_name (asmspec
);
1376 /* First detect errors in declaring global registers. */
1377 if (reg_number
== -1)
1378 error ("register name not specified for %q+D", decl
);
1379 else if (reg_number
< 0)
1380 error ("invalid register name for %q+D", decl
);
1381 else if (mode
== BLKmode
)
1382 error ("data type of %q+D isn%'t suitable for a register",
1384 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1385 error ("the register specified for %q+D cannot be accessed"
1386 " by the current target", decl
);
1387 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1388 error ("the register specified for %q+D is not general enough"
1389 " to be used as a register variable", decl
);
1390 else if (!HARD_REGNO_MODE_OK (reg_number
, mode
))
1391 error ("register specified for %q+D isn%'t suitable for data type",
1393 /* Now handle properly declared static register variables. */
1398 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1400 DECL_INITIAL (decl
) = 0;
1401 error ("global register variable has initial value");
1403 if (TREE_THIS_VOLATILE (decl
))
1404 warning (OPT_Wvolatile_register_var
,
1405 "optimization may eliminate reads and/or "
1406 "writes to register variables");
1408 /* If the user specified one of the eliminables registers here,
1409 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1410 confused with that register and be eliminated. This usage is
1411 somewhat suspect... */
1413 SET_DECL_RTL (decl
, gen_rtx_raw_REG (mode
, reg_number
));
1414 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1415 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1417 if (TREE_STATIC (decl
))
1419 /* Make this register global, so not usable for anything
1421 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1422 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1423 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1425 nregs
= hard_regno_nregs
[reg_number
][mode
];
1427 globalize_reg (decl
, reg_number
+ --nregs
);
1430 /* As a register variable, it has no section. */
1433 /* Avoid internal errors from invalid register
1435 SET_DECL_ASSEMBLER_NAME (decl
, NULL_TREE
);
1436 DECL_HARD_REGISTER (decl
) = 0;
1439 /* Now handle ordinary static variables and functions (in memory).
1440 Also handle vars declared register invalidly. */
1441 else if (name
[0] == '*')
1443 #ifdef REGISTER_PREFIX
1444 if (strlen (REGISTER_PREFIX
) != 0)
1446 reg_number
= decode_reg_name (name
);
1447 if (reg_number
>= 0 || reg_number
== -3)
1448 error ("register name given for non-register variable %q+D", decl
);
1453 /* Specifying a section attribute on a variable forces it into a
1454 non-.bss section, and thus it cannot be common. */
1455 /* FIXME: In general this code should not be necessary because
1456 visibility pass is doing the same work. But notice_global_symbol
1457 is called early and it needs to make DECL_RTL to get the name.
1458 we take care of recomputing the DECL_RTL after visibility is changed. */
1459 if (TREE_CODE (decl
) == VAR_DECL
1460 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
))
1461 && DECL_SECTION_NAME (decl
) != NULL
1462 && DECL_INITIAL (decl
) == NULL_TREE
1463 && DECL_COMMON (decl
))
1464 DECL_COMMON (decl
) = 0;
1466 /* Variables can't be both common and weak. */
1467 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1468 DECL_COMMON (decl
) = 0;
1470 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1471 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1474 machine_mode address_mode
= Pmode
;
1475 if (TREE_TYPE (decl
) != error_mark_node
)
1477 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1478 address_mode
= targetm
.addr_space
.address_mode (as
);
1480 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1482 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1483 SET_SYMBOL_REF_DECL (x
, decl
);
1485 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1486 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1487 set_mem_attributes (x
, decl
, 1);
1488 SET_DECL_RTL (decl
, x
);
1490 /* Optionally set flags or add text to the name to record information
1491 such as that it is a function name.
1492 If the name is changed, the macro ASM_OUTPUT_LABELREF
1493 will have to know how to strip this information. */
1494 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1497 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1498 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1502 make_decl_rtl_for_debug (tree decl
)
1504 unsigned int save_aliasing_flag
;
1507 if (DECL_RTL_SET_P (decl
))
1508 return DECL_RTL (decl
);
1510 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1511 call new_alias_set. If running with -fcompare-debug, sometimes
1512 we do not want to create alias sets that will throw the alias
1513 numbers off in the comparison dumps. So... clearing
1514 flag_strict_aliasing will keep new_alias_set() from creating a
1516 save_aliasing_flag
= flag_strict_aliasing
;
1517 flag_strict_aliasing
= 0;
1519 rtl
= DECL_RTL (decl
);
1520 /* Reset DECL_RTL back, as various parts of the compiler expects
1521 DECL_RTL set meaning it is actually going to be output. */
1522 SET_DECL_RTL (decl
, NULL
);
1524 flag_strict_aliasing
= save_aliasing_flag
;
1528 /* Output a string of literal assembler code
1529 for an `asm' keyword used between functions. */
1532 assemble_asm (tree string
)
1537 if (TREE_CODE (string
) == ADDR_EXPR
)
1538 string
= TREE_OPERAND (string
, 0);
1540 p
= TREE_STRING_POINTER (string
);
1541 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1544 /* Write the address of the entity given by SYMBOL to SEC. */
1546 assemble_addr_to_section (rtx symbol
, section
*sec
)
1548 switch_to_section (sec
);
1549 assemble_align (POINTER_SIZE
);
1550 assemble_integer (symbol
, POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
1553 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1554 not) section for PRIORITY. */
1556 get_cdtor_priority_section (int priority
, bool constructor_p
)
1560 /* ??? This only works reliably with the GNU linker. */
1561 sprintf (buf
, "%s.%.5u",
1562 constructor_p
? ".ctors" : ".dtors",
1563 /* Invert the numbering so the linker puts us in the proper
1564 order; constructors are run from right to left, and the
1565 linker sorts in increasing order. */
1566 MAX_INIT_PRIORITY
- priority
);
1567 return get_section (buf
, SECTION_WRITE
, NULL
);
1571 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1575 if (priority
!= DEFAULT_INIT_PRIORITY
)
1576 sec
= get_cdtor_priority_section (priority
,
1577 /*constructor_p=*/false);
1579 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1581 assemble_addr_to_section (symbol
, sec
);
1584 #ifdef DTORS_SECTION_ASM_OP
1586 default_dtor_section_asm_out_destructor (rtx symbol
,
1587 int priority ATTRIBUTE_UNUSED
)
1589 assemble_addr_to_section (symbol
, dtors_section
);
1594 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1598 if (priority
!= DEFAULT_INIT_PRIORITY
)
1599 sec
= get_cdtor_priority_section (priority
,
1600 /*constructor_p=*/true);
1602 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1604 assemble_addr_to_section (symbol
, sec
);
1607 #ifdef CTORS_SECTION_ASM_OP
1609 default_ctor_section_asm_out_constructor (rtx symbol
,
1610 int priority ATTRIBUTE_UNUSED
)
1612 assemble_addr_to_section (symbol
, ctors_section
);
1616 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1617 a nonzero value if the constant pool should be output before the
1618 start of the function, or a zero value if the pool should output
1619 after the end of the function. The default is to put it before the
1622 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1623 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1626 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1627 to be output to assembler.
1628 Set first_global_object_name and weak_global_object_name as appropriate. */
1631 notice_global_symbol (tree decl
)
1633 const char **type
= &first_global_object_name
;
1635 if (first_global_object_name
1636 || !TREE_PUBLIC (decl
)
1637 || DECL_EXTERNAL (decl
)
1638 || !DECL_NAME (decl
)
1639 || (TREE_CODE (decl
) != FUNCTION_DECL
1640 && (TREE_CODE (decl
) != VAR_DECL
1641 || (DECL_COMMON (decl
)
1642 && (DECL_INITIAL (decl
) == 0
1643 || DECL_INITIAL (decl
) == error_mark_node
))))
1644 || !MEM_P (DECL_RTL (decl
)))
1647 /* We win when global object is found, but it is useful to know about weak
1648 symbol as well so we can produce nicer unique names. */
1649 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1650 type
= &weak_global_object_name
;
1656 rtx decl_rtl
= DECL_RTL (decl
);
1658 p
= targetm
.strip_name_encoding (XSTR (XEXP (decl_rtl
, 0), 0));
1659 name
= ggc_strdup (p
);
1665 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1666 current function goes into the cold section, so that targets can use
1667 current_function_section during RTL expansion. DECL describes the
1671 decide_function_section (tree decl
)
1673 first_function_block_is_cold
= false;
1675 if (flag_reorder_blocks_and_partition
)
1676 /* We will decide in assemble_start_function. */
1679 if (DECL_SECTION_NAME (decl
))
1681 struct cgraph_node
*node
= cgraph_node::get (current_function_decl
);
1682 /* Calls to function_section rely on first_function_block_is_cold
1684 first_function_block_is_cold
= (node
1686 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1689 in_cold_section_p
= first_function_block_is_cold
;
1692 /* Get the function's name, as described by its RTL. This may be
1693 different from the DECL_NAME name used in the source file. */
1695 get_fnname_from_decl (tree decl
)
1697 rtx x
= DECL_RTL (decl
);
1698 gcc_assert (MEM_P (x
));
1700 gcc_assert (GET_CODE (x
) == SYMBOL_REF
);
1704 /* Output assembler code for the constant pool of a function and associated
1705 with defining the name of the function. DECL describes the function.
1706 NAME is the function's name. For the constant pool, we use the current
1707 constant pool data. */
1710 assemble_start_function (tree decl
, const char *fnname
)
1713 char tmp_label
[100];
1714 bool hot_label_written
= false;
1716 if (flag_reorder_blocks_and_partition
)
1718 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1719 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1720 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1721 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1722 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1723 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1724 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1725 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1730 crtl
->subsections
.hot_section_label
= NULL
;
1731 crtl
->subsections
.cold_section_label
= NULL
;
1732 crtl
->subsections
.hot_section_end_label
= NULL
;
1733 crtl
->subsections
.cold_section_end_label
= NULL
;
1736 /* The following code does not need preprocessing in the assembler. */
1740 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1741 output_constant_pool (fnname
, decl
);
1743 /* Make sure the not and cold text (code) sections are properly
1744 aligned. This is necessary here in the case where the function
1745 has both hot and cold sections, because we don't want to re-set
1746 the alignment when the section switch happens mid-function. */
1748 if (flag_reorder_blocks_and_partition
)
1750 first_function_block_is_cold
= false;
1752 switch_to_section (unlikely_text_section ());
1753 assemble_align (DECL_ALIGN (decl
));
1754 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1756 /* When the function starts with a cold section, we need to explicitly
1757 align the hot section and write out the hot section label.
1758 But if the current function is a thunk, we do not have a CFG. */
1760 && BB_PARTITION (ENTRY_BLOCK_PTR_FOR_FN (cfun
)->next_bb
) == BB_COLD_PARTITION
)
1762 switch_to_section (text_section
);
1763 assemble_align (DECL_ALIGN (decl
));
1764 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1765 hot_label_written
= true;
1766 first_function_block_is_cold
= true;
1768 in_cold_section_p
= first_function_block_is_cold
;
1772 /* Switch to the correct text section for the start of the function. */
1774 switch_to_section (function_section (decl
));
1775 if (flag_reorder_blocks_and_partition
1776 && !hot_label_written
)
1777 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1779 /* Tell assembler to move to target machine's alignment for functions. */
1780 align
= floor_log2 (DECL_ALIGN (decl
) / BITS_PER_UNIT
);
1783 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1786 /* Handle a user-specified function alignment.
1787 Note that we still need to align to DECL_ALIGN, as above,
1788 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1789 if (! DECL_USER_ALIGN (decl
)
1790 && align_functions_log
> align
1791 && optimize_function_for_speed_p (cfun
))
1793 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1794 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1795 align_functions_log
, align_functions
- 1);
1797 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1801 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1802 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1805 if (!DECL_IGNORED_P (decl
))
1806 (*debug_hooks
->begin_function
) (decl
);
1808 /* Make function name accessible from other files, if appropriate. */
1810 if (TREE_PUBLIC (decl
)
1811 || (cgraph_node::get (decl
)->instrumentation_clone
1812 && cgraph_node::get (decl
)->instrumented_version
1813 && TREE_PUBLIC (cgraph_node::get (decl
)->instrumented_version
->decl
)))
1815 notice_global_symbol (decl
);
1817 globalize_decl (decl
);
1819 maybe_assemble_visibility (decl
);
1822 if (DECL_PRESERVE_P (decl
))
1823 targetm
.asm_out
.mark_decl_preserved (fnname
);
1825 /* Do any machine/system dependent processing of the function name. */
1826 #ifdef ASM_DECLARE_FUNCTION_NAME
1827 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1829 /* Standard thing is just output label for the function. */
1830 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1831 #endif /* ASM_DECLARE_FUNCTION_NAME */
1833 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1834 saw_no_split_stack
= true;
1837 /* Output assembler code associated with defining the size of the
1838 function. DECL describes the function. NAME is the function's name. */
1841 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1843 #ifdef ASM_DECLARE_FUNCTION_SIZE
1844 /* We could have switched section in the middle of the function. */
1845 if (flag_reorder_blocks_and_partition
)
1846 switch_to_section (function_section (decl
));
1847 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1849 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1851 output_constant_pool (fnname
, decl
);
1852 switch_to_section (function_section (decl
)); /* need to switch back */
1854 /* Output labels for end of hot/cold text sections (to be used by
1856 if (flag_reorder_blocks_and_partition
)
1858 section
*save_text_section
;
1860 save_text_section
= in_section
;
1861 switch_to_section (unlikely_text_section ());
1862 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1863 if (first_function_block_is_cold
)
1864 switch_to_section (text_section
);
1866 switch_to_section (function_section (decl
));
1867 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1868 switch_to_section (save_text_section
);
1872 /* Assemble code to leave SIZE bytes of zeros. */
1875 assemble_zeros (unsigned HOST_WIDE_INT size
)
1877 /* Do no output if -fsyntax-only. */
1878 if (flag_syntax_only
)
1881 #ifdef ASM_NO_SKIP_IN_TEXT
1882 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1883 so we must output 0s explicitly in the text section. */
1884 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1886 unsigned HOST_WIDE_INT i
;
1887 for (i
= 0; i
< size
; i
++)
1888 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1893 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1896 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1899 assemble_align (int align
)
1901 if (align
> BITS_PER_UNIT
)
1903 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1907 /* Assemble a string constant with the specified C string as contents. */
1910 assemble_string (const char *p
, int size
)
1915 /* If the string is very long, split it up. */
1919 int thissize
= size
- pos
;
1920 if (thissize
> maximum
)
1923 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1931 /* A noswitch_section_callback for lcomm_section. */
1934 emit_local (tree decl ATTRIBUTE_UNUSED
,
1935 const char *name ATTRIBUTE_UNUSED
,
1936 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1937 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1939 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1940 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1941 size
, DECL_ALIGN (decl
));
1943 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1944 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1947 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1952 /* A noswitch_section_callback for bss_noswitch_section. */
1954 #if defined ASM_OUTPUT_ALIGNED_BSS
1956 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1957 const char *name ATTRIBUTE_UNUSED
,
1958 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1959 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1961 #if defined ASM_OUTPUT_ALIGNED_BSS
1962 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
,
1963 get_variable_align (decl
));
1969 /* A noswitch_section_callback for comm_section. */
1972 emit_common (tree decl ATTRIBUTE_UNUSED
,
1973 const char *name ATTRIBUTE_UNUSED
,
1974 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1975 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1977 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1978 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1979 size
, get_variable_align (decl
));
1981 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1982 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
,
1983 get_variable_align (decl
));
1986 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1991 /* A noswitch_section_callback for tls_comm_section. */
1994 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1995 const char *name ATTRIBUTE_UNUSED
,
1996 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1997 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1999 #ifdef ASM_OUTPUT_TLS_COMMON
2000 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
2003 sorry ("thread-local COMMON data not implemented");
2008 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
2009 NAME is the name of DECL's SYMBOL_REF. */
2012 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
,
2015 unsigned HOST_WIDE_INT size
, rounded
;
2017 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2020 if ((flag_sanitize
& SANITIZE_ADDRESS
) && asan_protect_global (decl
))
2021 size
+= asan_red_zone_size (size
);
2023 /* Don't allocate zero bytes of common,
2024 since that means "undefined external" in the linker. */
2028 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2029 so that each uninitialized object starts on such a boundary. */
2030 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
2031 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2032 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2034 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
2035 && (unsigned HOST_WIDE_INT
) (align
/ BITS_PER_UNIT
) > rounded
)
2036 error ("requested alignment for %q+D is greater than "
2037 "implemented alignment of %wu", decl
, rounded
);
2040 /* A subroutine of assemble_variable. Output the label and contents of
2041 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
2042 is as for assemble_variable. */
2045 assemble_variable_contents (tree decl
, const char *name
,
2046 bool dont_output_data
)
2048 /* Do any machine/system dependent processing of the object. */
2049 #ifdef ASM_DECLARE_OBJECT_NAME
2050 last_assemble_variable_decl
= decl
;
2051 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
2053 /* Standard thing is just output label for the object. */
2054 ASM_OUTPUT_LABEL (asm_out_file
, name
);
2055 #endif /* ASM_DECLARE_OBJECT_NAME */
2057 if (!dont_output_data
)
2059 /* Caller is supposed to use varpool_get_constructor when it wants
2060 to output the body. */
2061 gcc_assert (!in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
);
2062 if (DECL_INITIAL (decl
)
2063 && DECL_INITIAL (decl
) != error_mark_node
2064 && !initializer_zerop (DECL_INITIAL (decl
)))
2065 /* Output the actual data. */
2066 output_constant (DECL_INITIAL (decl
),
2067 tree_to_uhwi (DECL_SIZE_UNIT (decl
)),
2068 get_variable_align (decl
));
2070 /* Leave space for it. */
2071 assemble_zeros (tree_to_uhwi (DECL_SIZE_UNIT (decl
)));
2072 targetm
.asm_out
.decl_end ();
2076 /* Write out assembly for the variable DECL, which is not defined in
2077 the current translation unit. */
2079 assemble_undefined_decl (tree decl
)
2081 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
2082 targetm
.asm_out
.assemble_undefined_decl (asm_out_file
, name
, decl
);
2085 /* Assemble everything that is needed for a variable or function declaration.
2086 Not used for automatic variables, and not used for function definitions.
2087 Should not be called for variables of incomplete structure type.
2089 TOP_LEVEL is nonzero if this variable has file scope.
2090 AT_END is nonzero if this is the special handling, at end of compilation,
2091 to define things that have had only tentative definitions.
2092 DONT_OUTPUT_DATA if nonzero means don't actually output the
2093 initial value (that will be done by the caller). */
2096 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
2097 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
2100 rtx decl_rtl
, symbol
;
2103 bool asan_protected
= false;
2105 /* This function is supposed to handle VARIABLES. Ensure we have one. */
2106 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
2108 /* Emulated TLS had better not get this far. */
2109 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
2111 last_assemble_variable_decl
= 0;
2113 /* Normally no need to say anything here for external references,
2114 since assemble_external is called by the language-specific code
2115 when a declaration is first seen. */
2117 if (DECL_EXTERNAL (decl
))
2120 /* Do nothing for global register variables. */
2121 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
2123 TREE_ASM_WRITTEN (decl
) = 1;
2127 /* If type was incomplete when the variable was declared,
2128 see if it is complete now. */
2130 if (DECL_SIZE (decl
) == 0)
2131 layout_decl (decl
, 0);
2133 /* Still incomplete => don't allocate it; treat the tentative defn
2134 (which is what it must have been) as an `extern' reference. */
2136 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2138 error ("storage size of %q+D isn%'t known", decl
);
2139 TREE_ASM_WRITTEN (decl
) = 1;
2143 /* The first declaration of a variable that comes through this function
2144 decides whether it is global (in C, has external linkage)
2145 or local (in C, has internal linkage). So do nothing more
2146 if this function has already run. */
2148 if (TREE_ASM_WRITTEN (decl
))
2151 /* Make sure targetm.encode_section_info is invoked before we set
2153 decl_rtl
= DECL_RTL (decl
);
2155 TREE_ASM_WRITTEN (decl
) = 1;
2157 /* Do no output if -fsyntax-only. */
2158 if (flag_syntax_only
)
2161 if (! dont_output_data
2162 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
2164 error ("size of variable %q+D is too large", decl
);
2168 gcc_assert (MEM_P (decl_rtl
));
2169 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2170 symbol
= XEXP (decl_rtl
, 0);
2172 /* If this symbol belongs to the tree constant pool, output the constant
2173 if it hasn't already been written. */
2174 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
2176 tree decl
= SYMBOL_REF_DECL (symbol
);
2177 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
2178 output_constant_def_contents (symbol
);
2184 name
= XSTR (symbol
, 0);
2185 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2186 notice_global_symbol (decl
);
2188 /* Compute the alignment of this data. */
2190 align_variable (decl
, dont_output_data
);
2192 if ((flag_sanitize
& SANITIZE_ADDRESS
)
2193 && asan_protect_global (decl
))
2195 asan_protected
= true;
2196 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
2197 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
2200 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2202 align
= get_variable_align (decl
);
2204 if (TREE_PUBLIC (decl
))
2205 maybe_assemble_visibility (decl
);
2207 if (DECL_PRESERVE_P (decl
))
2208 targetm
.asm_out
.mark_decl_preserved (name
);
2210 /* First make the assembler name(s) global if appropriate. */
2211 sect
= get_variable_section (decl
, false);
2212 if (TREE_PUBLIC (decl
)
2213 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2214 globalize_decl (decl
);
2216 /* Output any data that we will need to use the address of. */
2217 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2218 output_addressed_constants (DECL_INITIAL (decl
));
2220 /* dbxout.c needs to know this. */
2221 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2222 DECL_IN_TEXT_SECTION (decl
) = 1;
2224 /* If the decl is part of an object_block, make sure that the decl
2225 has been positioned within its block, but do not write out its
2226 definition yet. output_object_blocks will do that later. */
2227 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2229 gcc_assert (!dont_output_data
);
2230 place_block_symbol (symbol
);
2232 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2233 assemble_noswitch_variable (decl
, name
, sect
, align
);
2236 /* The following bit of code ensures that vtable_map
2237 variables are not only in the comdat section, but that
2238 each variable has its own unique comdat name. If this
2239 code is removed, the variables end up in the same section
2240 with a single comdat name.
2242 FIXME: resolve_unique_section needs to deal better with
2243 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
2244 that is fixed, this if-else statement can be replaced with
2245 a single call to "switch_to_section (sect)". */
2246 if (sect
->named
.name
2247 && (strcmp (sect
->named
.name
, ".vtable_map_vars") == 0))
2249 #if defined (OBJECT_FORMAT_ELF)
2250 targetm
.asm_out
.named_section (sect
->named
.name
,
2251 sect
->named
.common
.flags
2255 #elif defined (TARGET_PECOFF)
2256 /* Neither OBJECT_FORMAT_PE, nor OBJECT_FORMAT_COFF is set here.
2257 Therefore the following check is used.
2258 In case a the target is PE or COFF a comdat group section
2259 is created, e.g. .vtable_map_vars$foo. The linker places
2260 everything in .vtable_map_vars at the end.
2262 A fix could be made in
2263 gcc/config/i386/winnt.c: i386_pe_unique_section. */
2268 if (TREE_CODE (DECL_NAME (decl
)) == IDENTIFIER_NODE
)
2269 name
= ACONCAT ((sect
->named
.name
, "$",
2270 IDENTIFIER_POINTER (DECL_NAME (decl
)), NULL
));
2272 name
= ACONCAT ((sect
->named
.name
, "$",
2273 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (DECL_NAME (decl
))),
2276 targetm
.asm_out
.named_section (name
,
2277 sect
->named
.common
.flags
2283 switch_to_section (sect
);
2287 switch_to_section (sect
);
2288 if (align
> BITS_PER_UNIT
)
2289 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
2290 assemble_variable_contents (decl
, name
, dont_output_data
);
2293 unsigned HOST_WIDE_INT
int size
2294 = tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2295 assemble_zeros (asan_red_zone_size (size
));
2301 /* Given a function declaration (FN_DECL), this function assembles the
2302 function into the .preinit_array section. */
2305 assemble_vtv_preinit_initializer (tree fn_decl
)
2308 unsigned flags
= SECTION_WRITE
;
2309 rtx symbol
= XEXP (DECL_RTL (fn_decl
), 0);
2311 flags
|= SECTION_NOTYPE
;
2312 sect
= get_section (".preinit_array", flags
, fn_decl
);
2313 switch_to_section (sect
);
2314 assemble_addr_to_section (symbol
, sect
);
2317 /* Return 1 if type TYPE contains any pointers. */
2320 contains_pointers_p (tree type
)
2322 switch (TREE_CODE (type
))
2325 case REFERENCE_TYPE
:
2326 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2327 so I'll play safe and return 1. */
2333 case QUAL_UNION_TYPE
:
2336 /* For a type that has fields, see if the fields have pointers. */
2337 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2338 if (TREE_CODE (fields
) == FIELD_DECL
2339 && contains_pointers_p (TREE_TYPE (fields
)))
2345 /* An array type contains pointers if its element type does. */
2346 return contains_pointers_p (TREE_TYPE (type
));
2353 /* We delay assemble_external processing until
2354 the compilation unit is finalized. This is the best we can do for
2355 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2356 it all the way to final. See PR 17982 for further discussion. */
2357 static GTY(()) tree pending_assemble_externals
;
2359 #ifdef ASM_OUTPUT_EXTERNAL
2360 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2361 As a result, assemble_external can be called after the list of externals
2362 is processed and the pointer set destroyed. */
2363 static bool pending_assemble_externals_processed
;
2365 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2366 TREE_LIST in assemble_external. */
2367 static hash_set
<tree
> *pending_assemble_externals_set
;
2369 /* True if DECL is a function decl for which no out-of-line copy exists.
2370 It is assumed that DECL's assembler name has been set. */
2373 incorporeal_function_p (tree decl
)
2375 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2379 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2380 && (DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
2381 || DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA_WITH_ALIGN
))
2384 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2385 /* Atomic or sync builtins which have survived this far will be
2386 resolved externally and therefore are not incorporeal. */
2387 if (strncmp (name
, "__builtin_", 10) == 0)
2393 /* Actually do the tests to determine if this is necessary, and invoke
2394 ASM_OUTPUT_EXTERNAL. */
2396 assemble_external_real (tree decl
)
2398 rtx rtl
= DECL_RTL (decl
);
2400 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2401 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2402 && !incorporeal_function_p (decl
))
2404 /* Some systems do require some output. */
2405 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2406 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2412 process_pending_assemble_externals (void)
2414 #ifdef ASM_OUTPUT_EXTERNAL
2416 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2417 assemble_external_real (TREE_VALUE (list
));
2419 pending_assemble_externals
= 0;
2420 pending_assemble_externals_processed
= true;
2421 delete pending_assemble_externals_set
;
2425 /* This TREE_LIST contains any weak symbol declarations waiting
2427 static GTY(()) tree weak_decls
;
2429 /* Output something to declare an external symbol to the assembler,
2430 and qualifiers such as weakness. (Most assemblers don't need
2431 extern declaration, so we normally output nothing.) Do nothing if
2432 DECL is not external. */
2435 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2437 /* Make sure that the ASM_OUT_FILE is open.
2438 If it's not, we should not be calling this function. */
2439 gcc_assert (asm_out_file
);
2441 /* In a perfect world, the following condition would be true.
2442 Sadly, the Java and Go front ends emit assembly *from the front end*,
2443 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2445 /* This function should only be called if we are expanding, or have
2447 Ideally, only final.c would be calling this function, but it is
2448 not clear whether that would break things somehow. See PR 17982
2449 for further discussion. */
2450 gcc_assert (state
== EXPANSION
2451 || state
== FINISHED
);
2454 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2457 /* We want to output annotation for weak and external symbols at
2458 very last to check if they are references or not. */
2460 if (TARGET_SUPPORTS_WEAK
2462 /* TREE_STATIC is a weird and abused creature which is not
2463 generally the right test for whether an entity has been
2464 locally emitted, inlined or otherwise not-really-extern, but
2465 for declarations that can be weak, it happens to be
2467 && !TREE_STATIC (decl
)
2468 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2469 && value_member (decl
, weak_decls
) == NULL_TREE
)
2470 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2472 #ifdef ASM_OUTPUT_EXTERNAL
2473 if (pending_assemble_externals_processed
)
2475 assemble_external_real (decl
);
2479 if (! pending_assemble_externals_set
->add (decl
))
2480 pending_assemble_externals
= tree_cons (NULL
, decl
,
2481 pending_assemble_externals
);
2485 /* Similar, for calling a library function FUN. */
2488 assemble_external_libcall (rtx fun
)
2490 /* Declare library function name external when first used, if nec. */
2491 if (! SYMBOL_REF_USED (fun
))
2493 SYMBOL_REF_USED (fun
) = 1;
2494 targetm
.asm_out
.external_libcall (fun
);
2498 /* Assemble a label named NAME. */
2501 assemble_label (FILE *file
, const char *name
)
2503 ASM_OUTPUT_LABEL (file
, name
);
2506 /* Set the symbol_referenced flag for ID. */
2508 mark_referenced (tree id
)
2510 TREE_SYMBOL_REFERENCED (id
) = 1;
2513 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2515 mark_decl_referenced (tree decl
)
2517 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2519 /* Extern inline functions don't become needed when referenced.
2520 If we know a method will be emitted in other TU and no new
2521 functions can be marked reachable, just use the external
2523 struct cgraph_node
*node
= cgraph_node::get_create (decl
);
2524 if (!DECL_EXTERNAL (decl
)
2525 && !node
->definition
)
2526 node
->mark_force_output ();
2528 else if (TREE_CODE (decl
) == VAR_DECL
)
2530 varpool_node
*node
= varpool_node::get_create (decl
);
2531 /* C++ frontend use mark_decl_references to force COMDAT variables
2532 to be output that might appear dead otherwise. */
2533 node
->force_output
= true;
2535 /* else do nothing - we can get various sorts of CST nodes here,
2536 which do not need to be marked. */
2540 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2541 starts with a *, the rest of NAME is output verbatim. Otherwise
2542 NAME is transformed in a target-specific way (usually by the
2543 addition of an underscore). */
2546 assemble_name_raw (FILE *file
, const char *name
)
2549 fputs (&name
[1], file
);
2551 ASM_OUTPUT_LABELREF (file
, name
);
2554 /* Like assemble_name_raw, but should be used when NAME might refer to
2555 an entity that is also represented as a tree (like a function or
2556 variable). If NAME does refer to such an entity, that entity will
2557 be marked as referenced. */
2560 assemble_name (FILE *file
, const char *name
)
2562 const char *real_name
;
2565 real_name
= targetm
.strip_name_encoding (name
);
2567 id
= maybe_get_identifier (real_name
);
2572 mark_referenced (id
);
2573 ultimate_transparent_alias_target (&id
);
2575 name
= IDENTIFIER_POINTER (id
);
2576 gcc_assert (! TREE_CHAIN (id
));
2579 assemble_name_raw (file
, name
);
2582 /* Allocate SIZE bytes writable static space with a gensym name
2583 and return an RTX to refer to its address. */
2586 assemble_static_space (unsigned HOST_WIDE_INT size
)
2589 const char *namestring
;
2592 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2594 namestring
= ggc_strdup (name
);
2596 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2597 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2599 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2600 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2603 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2604 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2607 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2608 so that each uninitialized object starts on such a boundary. */
2609 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2610 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2611 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2612 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2613 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2614 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2621 /* Assemble the static constant template for function entry trampolines.
2622 This is done at most once per compilation.
2623 Returns an RTX for the address of the template. */
2625 static GTY(()) rtx initial_trampoline
;
2628 assemble_trampoline_template (void)
2635 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2637 if (initial_trampoline
)
2638 return initial_trampoline
;
2640 /* By default, put trampoline templates in read-only data section. */
2642 #ifdef TRAMPOLINE_SECTION
2643 switch_to_section (TRAMPOLINE_SECTION
);
2645 switch_to_section (readonly_data_section
);
2648 /* Write the assembler code to define one. */
2649 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2651 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2653 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2654 targetm
.asm_out
.trampoline_template (asm_out_file
);
2656 /* Record the rtl to refer to it. */
2657 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2658 name
= ggc_strdup (label
);
2659 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2660 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2662 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2663 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2664 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2666 return initial_trampoline
;
2669 /* A and B are either alignments or offsets. Return the minimum alignment
2670 that may be assumed after adding the two together. */
2672 static inline unsigned
2673 min_align (unsigned int a
, unsigned int b
)
2675 return (a
| b
) & -(a
| b
);
2678 /* Return the assembler directive for creating a given kind of integer
2679 object. SIZE is the number of bytes in the object and ALIGNED_P
2680 indicates whether it is known to be aligned. Return NULL if the
2681 assembly dialect has no such directive.
2683 The returned string should be printed at the start of a new line and
2684 be followed immediately by the object's initial value. */
2687 integer_asm_op (int size
, int aligned_p
)
2689 struct asm_int_op
*ops
;
2692 ops
= &targetm
.asm_out
.aligned_op
;
2694 ops
= &targetm
.asm_out
.unaligned_op
;
2699 return targetm
.asm_out
.byte_op
;
2713 /* Use directive OP to assemble an integer object X. Print OP at the
2714 start of the line, followed immediately by the value of X. */
2717 assemble_integer_with_op (const char *op
, rtx x
)
2719 fputs (op
, asm_out_file
);
2720 output_addr_const (asm_out_file
, x
);
2721 fputc ('\n', asm_out_file
);
2724 /* The default implementation of the asm_out.integer target hook. */
2727 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2728 unsigned int size ATTRIBUTE_UNUSED
,
2729 int aligned_p ATTRIBUTE_UNUSED
)
2731 const char *op
= integer_asm_op (size
, aligned_p
);
2732 /* Avoid GAS bugs for large values. Specifically negative values whose
2733 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2734 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE_UNITS
)
2736 return op
&& (assemble_integer_with_op (op
, x
), true);
2739 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2740 the alignment of the integer in bits. Return 1 if we were able to output
2741 the constant, otherwise 0. We must be able to output the constant,
2742 if FORCE is nonzero. */
2745 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2749 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2751 /* See if the target hook can handle this kind of object. */
2752 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2755 /* If the object is a multi-byte one, try splitting it up. Split
2756 it into words it if is multi-word, otherwise split it into bytes. */
2759 machine_mode omode
, imode
;
2760 unsigned int subalign
;
2761 unsigned int subsize
, i
;
2762 enum mode_class mclass
;
2764 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2765 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2766 if (GET_CODE (x
) == CONST_FIXED
)
2767 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2771 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2772 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2774 for (i
= 0; i
< size
; i
+= subsize
)
2776 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2777 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2783 /* If we've printed some of it, but not all of it, there's no going
2788 gcc_assert (!force
);
2794 assemble_real (REAL_VALUE_TYPE d
, machine_mode mode
, unsigned int align
)
2796 long data
[4] = {0, 0, 0, 0};
2798 int bitsize
, nelts
, nunits
, units_per
;
2800 /* This is hairy. We have a quantity of known size. real_to_target
2801 will put it into an array of *host* longs, 32 bits per element
2802 (even if long is more than 32 bits). We need to determine the
2803 number of array elements that are occupied (nelts) and the number
2804 of *target* min-addressable units that will be occupied in the
2805 object file (nunits). We cannot assume that 32 divides the
2806 mode's bitsize (size * BITS_PER_UNIT) evenly.
2808 size * BITS_PER_UNIT is used here to make sure that padding bits
2809 (which might appear at either end of the value; real_to_target
2810 will include the padding bits in its output array) are included. */
2812 nunits
= GET_MODE_SIZE (mode
);
2813 bitsize
= nunits
* BITS_PER_UNIT
;
2814 nelts
= CEIL (bitsize
, 32);
2815 units_per
= 32 / BITS_PER_UNIT
;
2817 real_to_target (data
, &d
, mode
);
2819 /* Put out the first word with the specified alignment. */
2820 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2821 nunits
-= units_per
;
2823 /* Subsequent words need only 32-bit alignment. */
2824 align
= min_align (align
, 32);
2826 for (i
= 1; i
< nelts
; i
++)
2828 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2829 nunits
-= units_per
;
2833 /* Given an expression EXP with a constant value,
2834 reduce it to the sum of an assembler symbol and an integer.
2835 Store them both in the structure *VALUE.
2836 EXP must be reducible. */
2840 HOST_WIDE_INT offset
;
2844 decode_addr_const (tree exp
, struct addr_const
*value
)
2846 tree target
= TREE_OPERAND (exp
, 0);
2852 if (TREE_CODE (target
) == COMPONENT_REF
2853 && tree_fits_shwi_p (byte_position (TREE_OPERAND (target
, 1))))
2855 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2856 target
= TREE_OPERAND (target
, 0);
2858 else if (TREE_CODE (target
) == ARRAY_REF
2859 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2861 offset
+= (tree_to_uhwi (TYPE_SIZE_UNIT (TREE_TYPE (target
)))
2862 * tree_to_shwi (TREE_OPERAND (target
, 1)));
2863 target
= TREE_OPERAND (target
, 0);
2865 else if (TREE_CODE (target
) == MEM_REF
2866 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2868 offset
+= mem_ref_offset (target
).to_short_addr ();
2869 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2871 else if (TREE_CODE (target
) == INDIRECT_REF
2872 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2873 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2875 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2880 switch (TREE_CODE (target
))
2884 x
= DECL_RTL (target
);
2888 x
= gen_rtx_MEM (FUNCTION_MODE
,
2889 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2898 x
= output_constant_def (target
, 1);
2905 gcc_assert (MEM_P (x
));
2909 value
->offset
= offset
;
2912 static GTY(()) hash_table
<tree_descriptor_hasher
> *const_desc_htab
;
2914 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2916 /* Constant pool accessor function. */
2918 hash_table
<tree_descriptor_hasher
> *
2919 constant_pool_htab (void)
2921 return const_desc_htab
;
2924 /* Compute a hash code for a constant expression. */
2927 tree_descriptor_hasher::hash (constant_descriptor_tree
*ptr
)
2933 const_hash_1 (const tree exp
)
2938 enum tree_code code
= TREE_CODE (exp
);
2940 /* Either set P and LEN to the address and len of something to hash and
2941 exit the switch or return a value. */
2946 p
= (char *) &TREE_INT_CST_ELT (exp
, 0);
2947 len
= TREE_INT_CST_NUNITS (exp
) * sizeof (HOST_WIDE_INT
);
2951 return real_hash (TREE_REAL_CST_PTR (exp
));
2954 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2957 p
= TREE_STRING_POINTER (exp
);
2958 len
= TREE_STRING_LENGTH (exp
);
2962 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2963 + const_hash_1 (TREE_IMAGPART (exp
)));
2969 hi
= 7 + VECTOR_CST_NELTS (exp
);
2971 for (i
= 0; i
< VECTOR_CST_NELTS (exp
); ++i
)
2972 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ELT (exp
, i
));
2979 unsigned HOST_WIDE_INT idx
;
2982 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2984 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2986 hi
= hi
* 603 + const_hash_1 (value
);
2994 struct addr_const value
;
2996 decode_addr_const (exp
, &value
);
2997 switch (GET_CODE (value
.base
))
3000 /* Don't hash the address of the SYMBOL_REF;
3001 only use the offset and the symbol name. */
3003 p
= XSTR (value
.base
, 0);
3004 for (i
= 0; p
[i
] != 0; i
++)
3005 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3010 + CODE_LABEL_NUMBER (LABEL_REF_LABEL (value
.base
)) * 13);
3020 case POINTER_PLUS_EXPR
:
3022 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
3023 + const_hash_1 (TREE_OPERAND (exp
, 1)));
3026 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
3029 /* A language specific constant. Just hash the code. */
3033 /* Compute hashing function. */
3035 for (i
= 0; i
< len
; i
++)
3036 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3041 /* Wrapper of compare_constant, for the htab interface. */
3043 tree_descriptor_hasher::equal (constant_descriptor_tree
*c1
,
3044 constant_descriptor_tree
*c2
)
3046 if (c1
->hash
!= c2
->hash
)
3048 return compare_constant (c1
->value
, c2
->value
);
3051 /* Compare t1 and t2, and return 1 only if they are known to result in
3052 the same bit pattern on output. */
3055 compare_constant (const tree t1
, const tree t2
)
3057 enum tree_code typecode
;
3059 if (t1
== NULL_TREE
)
3060 return t2
== NULL_TREE
;
3061 if (t2
== NULL_TREE
)
3064 if (TREE_CODE (t1
) != TREE_CODE (t2
))
3067 switch (TREE_CODE (t1
))
3070 /* Integer constants are the same only if the same width of type. */
3071 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3073 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3075 return tree_int_cst_equal (t1
, t2
);
3078 /* Real constants are the same only if the same width of type. */
3079 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3082 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
3085 /* Fixed constants are the same only if the same width of type. */
3086 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3089 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
3092 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3095 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
3096 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
3097 TREE_STRING_LENGTH (t1
)));
3100 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
3101 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
3107 if (VECTOR_CST_NELTS (t1
) != VECTOR_CST_NELTS (t2
))
3110 for (i
= 0; i
< VECTOR_CST_NELTS (t1
); ++i
)
3111 if (!compare_constant (VECTOR_CST_ELT (t1
, i
),
3112 VECTOR_CST_ELT (t2
, i
)))
3120 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
3121 unsigned HOST_WIDE_INT idx
;
3123 typecode
= TREE_CODE (TREE_TYPE (t1
));
3124 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
3127 if (typecode
== ARRAY_TYPE
)
3129 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
3130 /* For arrays, check that the sizes all match. */
3131 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
3133 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
3138 /* For record and union constructors, require exact type
3140 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
3144 v1
= CONSTRUCTOR_ELTS (t1
);
3145 v2
= CONSTRUCTOR_ELTS (t2
);
3146 if (vec_safe_length (v1
) != vec_safe_length (v2
))
3149 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
3151 constructor_elt
*c1
= &(*v1
)[idx
];
3152 constructor_elt
*c2
= &(*v2
)[idx
];
3154 /* Check that each value is the same... */
3155 if (!compare_constant (c1
->value
, c2
->value
))
3157 /* ... and that they apply to the same fields! */
3158 if (typecode
== ARRAY_TYPE
)
3160 if (!compare_constant (c1
->index
, c2
->index
))
3165 if (c1
->index
!= c2
->index
)
3176 struct addr_const value1
, value2
;
3180 decode_addr_const (t1
, &value1
);
3181 decode_addr_const (t2
, &value2
);
3183 if (value1
.offset
!= value2
.offset
)
3186 code
= GET_CODE (value1
.base
);
3187 if (code
!= GET_CODE (value2
.base
))
3193 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3197 ret
= (CODE_LABEL_NUMBER (LABEL_REF_LABEL (value1
.base
))
3198 == CODE_LABEL_NUMBER (LABEL_REF_LABEL (value2
.base
)));
3208 case POINTER_PLUS_EXPR
:
3211 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3212 && compare_constant (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3215 case VIEW_CONVERT_EXPR
:
3216 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3225 /* Return the section into which constant EXP should be placed. */
3228 get_constant_section (tree exp
, unsigned int align
)
3230 return targetm
.asm_out
.select_section (exp
,
3231 compute_reloc_for_constant (exp
),
3235 /* Return the size of constant EXP in bytes. */
3237 static HOST_WIDE_INT
3238 get_constant_size (tree exp
)
3242 size
= int_size_in_bytes (TREE_TYPE (exp
));
3243 if (TREE_CODE (exp
) == STRING_CST
)
3244 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3248 /* Subroutine of output_constant_def:
3249 No constant equal to EXP is known to have been output.
3250 Make a constant descriptor to enter EXP in the hash table.
3251 Assign the label number and construct RTL to refer to the
3252 constant's location in memory.
3253 Caller is responsible for updating the hash table. */
3255 static struct constant_descriptor_tree
*
3256 build_constant_desc (tree exp
)
3258 struct constant_descriptor_tree
*desc
;
3264 desc
= ggc_alloc
<constant_descriptor_tree
> ();
3267 /* Create a string containing the label name, in LABEL. */
3268 labelno
= const_labelno
++;
3269 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3271 /* Construct the VAR_DECL associated with the constant. */
3272 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3274 DECL_ARTIFICIAL (decl
) = 1;
3275 DECL_IGNORED_P (decl
) = 1;
3276 TREE_READONLY (decl
) = 1;
3277 TREE_STATIC (decl
) = 1;
3278 TREE_ADDRESSABLE (decl
) = 1;
3279 /* We don't set the RTL yet as this would cause varpool to assume that the
3280 variable is referenced. Moreover, it would just be dropped in LTO mode.
3281 Instead we set the flag that will be recognized in make_decl_rtl. */
3282 DECL_IN_CONSTANT_POOL (decl
) = 1;
3283 DECL_INITIAL (decl
) = desc
->value
;
3284 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3285 architectures so use DATA_ALIGNMENT as well, except for strings. */
3286 if (TREE_CODE (exp
) == STRING_CST
)
3288 #ifdef CONSTANT_ALIGNMENT
3289 DECL_ALIGN (decl
) = CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
));
3293 align_variable (decl
, 0);
3295 /* Now construct the SYMBOL_REF and the MEM. */
3296 if (use_object_blocks_p ())
3298 section
*sect
= get_constant_section (exp
, DECL_ALIGN (decl
));
3299 symbol
= create_block_symbol (ggc_strdup (label
),
3300 get_block_for_section (sect
), -1);
3303 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3304 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3305 SET_SYMBOL_REF_DECL (symbol
, decl
);
3306 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3308 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3309 set_mem_attributes (rtl
, exp
, 1);
3310 set_mem_alias_set (rtl
, 0);
3312 /* We cannot share RTX'es in pool entries.
3313 Mark this piece of RTL as required for unsharing. */
3314 RTX_FLAG (rtl
, used
) = 1;
3316 /* Set flags or add text to the name to record information, such as
3317 that it is a local symbol. If the name is changed, the macro
3318 ASM_OUTPUT_LABELREF will have to know how to strip this
3319 information. This call might invalidate our local variable
3320 SYMBOL; we can't use it afterward. */
3321 targetm
.encode_section_info (exp
, rtl
, true);
3328 /* Return an rtx representing a reference to constant data in memory
3329 for the constant expression EXP.
3331 If assembler code for such a constant has already been output,
3332 return an rtx to refer to it.
3333 Otherwise, output such a constant in memory
3334 and generate an rtx for it.
3336 If DEFER is nonzero, this constant can be deferred and output only
3337 if referenced in the function after all optimizations.
3339 `const_desc_table' records which constants already have label strings. */
3342 output_constant_def (tree exp
, int defer
)
3344 struct constant_descriptor_tree
*desc
;
3345 struct constant_descriptor_tree key
;
3347 /* Look up EXP in the table of constant descriptors. If we didn't find
3348 it, create a new one. */
3350 key
.hash
= const_hash_1 (exp
);
3351 constant_descriptor_tree
**loc
3352 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3357 desc
= build_constant_desc (exp
);
3358 desc
->hash
= key
.hash
;
3362 maybe_output_constant_def_contents (desc
, defer
);
3366 /* Subroutine of output_constant_def: Decide whether or not we need to
3367 output the constant DESC now, and if so, do it. */
3369 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3372 rtx symbol
= XEXP (desc
->rtl
, 0);
3373 tree exp
= desc
->value
;
3375 if (flag_syntax_only
)
3378 if (TREE_ASM_WRITTEN (exp
))
3379 /* Already output; don't do it again. */
3382 /* We can always defer constants as long as the context allows
3386 /* Increment n_deferred_constants if it exists. It needs to be at
3387 least as large as the number of constants actually referred to
3388 by the function. If it's too small we'll stop looking too early
3389 and fail to emit constants; if it's too large we'll only look
3390 through the entire function when we could have stopped earlier. */
3392 n_deferred_constants
++;
3396 output_constant_def_contents (symbol
);
3399 /* Subroutine of output_constant_def_contents. Output the definition
3400 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3401 constant's alignment in bits. */
3404 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3408 size
= get_constant_size (exp
);
3410 /* Do any machine/system dependent processing of the constant. */
3411 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3413 /* Output the value of EXP. */
3414 output_constant (exp
, size
, align
);
3416 targetm
.asm_out
.decl_end ();
3419 /* We must output the constant data referred to by SYMBOL; do so. */
3422 output_constant_def_contents (rtx symbol
)
3424 tree decl
= SYMBOL_REF_DECL (symbol
);
3425 tree exp
= DECL_INITIAL (decl
);
3427 bool asan_protected
= false;
3429 /* Make sure any other constants whose addresses appear in EXP
3430 are assigned label numbers. */
3431 output_addressed_constants (exp
);
3433 /* We are no longer deferring this constant. */
3434 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3436 if ((flag_sanitize
& SANITIZE_ADDRESS
)
3437 && TREE_CODE (exp
) == STRING_CST
3438 && asan_protect_global (exp
))
3440 asan_protected
= true;
3441 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
3442 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
3445 /* If the constant is part of an object block, make sure that the
3446 decl has been positioned within its block, but do not write out
3447 its definition yet. output_object_blocks will do that later. */
3448 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3449 place_block_symbol (symbol
);
3452 align
= DECL_ALIGN (decl
);
3453 switch_to_section (get_constant_section (exp
, align
));
3454 if (align
> BITS_PER_UNIT
)
3455 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3456 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3459 HOST_WIDE_INT size
= get_constant_size (exp
);
3460 assemble_zeros (asan_red_zone_size (size
));
3465 /* Look up EXP in the table of constant descriptors. Return the rtl
3466 if it has been emitted, else null. */
3469 lookup_constant_def (tree exp
)
3471 struct constant_descriptor_tree key
;
3474 key
.hash
= const_hash_1 (exp
);
3475 constant_descriptor_tree
*desc
3476 = const_desc_htab
->find_with_hash (&key
, key
.hash
);
3478 return (desc
? desc
->rtl
: NULL_RTX
);
3481 /* Return a tree representing a reference to constant data in memory
3482 for the constant expression EXP.
3484 This is the counterpart of output_constant_def at the Tree level. */
3487 tree_output_constant_def (tree exp
)
3489 struct constant_descriptor_tree
*desc
, key
;
3492 /* Look up EXP in the table of constant descriptors. If we didn't find
3493 it, create a new one. */
3495 key
.hash
= const_hash_1 (exp
);
3496 constant_descriptor_tree
**loc
3497 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3502 desc
= build_constant_desc (exp
);
3503 desc
->hash
= key
.hash
;
3507 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3508 varpool_node::finalize_decl (decl
);
3512 struct GTY((chain_next ("%h.next"), for_user
)) constant_descriptor_rtx
{
3513 struct constant_descriptor_rtx
*next
;
3517 HOST_WIDE_INT offset
;
3525 struct const_rtx_desc_hasher
: ggc_hasher
<constant_descriptor_rtx
*>
3527 static hashval_t
hash (constant_descriptor_rtx
*);
3528 static bool equal (constant_descriptor_rtx
*, constant_descriptor_rtx
*);
3531 /* Used in the hash tables to avoid outputting the same constant
3532 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3533 are output once per function, not once per file. */
3534 /* ??? Only a few targets need per-function constant pools. Most
3535 can use one per-file pool. Should add a targetm bit to tell the
3538 struct GTY(()) rtx_constant_pool
{
3539 /* Pointers to first and last constant in pool, as ordered by offset. */
3540 struct constant_descriptor_rtx
*first
;
3541 struct constant_descriptor_rtx
*last
;
3543 /* Hash facility for making memory-constants from constant rtl-expressions.
3544 It is used on RISC machines where immediate integer arguments and
3545 constant addresses are restricted so that such constants must be stored
3547 hash_table
<const_rtx_desc_hasher
> *const_rtx_htab
;
3549 /* Current offset in constant pool (does not include any
3550 machine-specific header). */
3551 HOST_WIDE_INT offset
;
3554 /* Hash and compare functions for const_rtx_htab. */
3557 const_rtx_desc_hasher::hash (constant_descriptor_rtx
*desc
)
3563 const_rtx_desc_hasher::equal (constant_descriptor_rtx
*x
,
3564 constant_descriptor_rtx
*y
)
3566 if (x
->mode
!= y
->mode
)
3568 return rtx_equal_p (x
->constant
, y
->constant
);
3571 /* Hash one component of a constant. */
3574 const_rtx_hash_1 (const_rtx x
)
3576 unsigned HOST_WIDE_INT hwi
;
3582 code
= GET_CODE (x
);
3583 mode
= GET_MODE (x
);
3584 h
= (hashval_t
) code
* 1048573 + mode
;
3593 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3594 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3596 h
^= (hashval_t
) hwi
;
3597 for (i
= 1; i
< n
; ++i
)
3600 h
^= (hashval_t
) hwi
;
3605 case CONST_WIDE_INT
:
3606 hwi
= GET_MODE_PRECISION (mode
);
3608 for (i
= 0; i
< CONST_WIDE_INT_NUNITS (x
); i
++)
3609 hwi
^= CONST_WIDE_INT_ELT (x
, i
);
3614 if (TARGET_SUPPORTS_WIDE_INT
== 0 && mode
== VOIDmode
)
3616 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3620 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3624 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3628 h
^= htab_hash_string (XSTR (x
, 0));
3632 h
= h
* 251 + CODE_LABEL_NUMBER (LABEL_REF_LABEL (x
));
3636 case UNSPEC_VOLATILE
:
3637 h
= h
* 251 + XINT (x
, 1);
3647 /* Compute a hash value for X, which should be a constant. */
3650 const_rtx_hash (rtx x
)
3653 subrtx_iterator::array_type array
;
3654 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
3655 h
= h
* 509 + const_rtx_hash_1 (*iter
);
3660 /* Create and return a new rtx constant pool. */
3662 static struct rtx_constant_pool
*
3663 create_constant_pool (void)
3665 struct rtx_constant_pool
*pool
;
3667 pool
= ggc_alloc
<rtx_constant_pool
> ();
3668 pool
->const_rtx_htab
= hash_table
<const_rtx_desc_hasher
>::create_ggc (31);
3675 /* Initialize constant pool hashing for a new function. */
3678 init_varasm_status (void)
3680 crtl
->varasm
.pool
= create_constant_pool ();
3681 crtl
->varasm
.deferred_constants
= 0;
3684 /* Given a MINUS expression, simplify it if both sides
3685 include the same symbol. */
3688 simplify_subtraction (rtx x
)
3690 rtx r
= simplify_rtx (x
);
3694 /* Given a constant rtx X, make (or find) a memory constant for its value
3695 and return a MEM rtx to refer to it in memory. */
3698 force_const_mem (machine_mode mode
, rtx x
)
3700 struct constant_descriptor_rtx
*desc
, tmp
;
3701 struct rtx_constant_pool
*pool
;
3706 constant_descriptor_rtx
**slot
;
3708 /* If we're not allowed to drop X into the constant pool, don't. */
3709 if (targetm
.cannot_force_const_mem (mode
, x
))
3712 /* Record that this function has used a constant pool entry. */
3713 crtl
->uses_const_pool
= 1;
3715 /* Decide which pool to use. */
3716 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3717 ? shared_constant_pool
3718 : crtl
->varasm
.pool
);
3720 /* Lookup the value in the hashtable. */
3723 hash
= const_rtx_hash (x
);
3724 slot
= pool
->const_rtx_htab
->find_slot_with_hash (&tmp
, hash
, INSERT
);
3727 /* If the constant was already present, return its memory. */
3729 return copy_rtx (desc
->mem
);
3731 /* Otherwise, create a new descriptor. */
3732 desc
= ggc_alloc
<constant_descriptor_rtx
> ();
3735 /* Align the location counter as required by EXP's data type. */
3736 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3737 #ifdef CONSTANT_ALIGNMENT
3739 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3740 if (type
!= NULL_TREE
)
3741 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3745 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3746 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3749 desc
->constant
= copy_rtx (tmp
.constant
);
3750 desc
->offset
= pool
->offset
;
3753 desc
->align
= align
;
3754 desc
->labelno
= const_labelno
;
3757 pool
->offset
+= GET_MODE_SIZE (mode
);
3759 pool
->last
->next
= desc
;
3761 pool
->first
= pool
->last
= desc
;
3764 /* Create a string containing the label name, in LABEL. */
3765 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3768 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3769 the constants pool. */
3770 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3772 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3773 symbol
= create_block_symbol (ggc_strdup (label
),
3774 get_block_for_section (sect
), -1);
3777 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3779 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3780 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3781 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3783 /* Construct the MEM. */
3784 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3785 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3786 set_mem_align (def
, align
);
3788 /* If we're dropping a label to the constant pool, make sure we
3790 if (GET_CODE (x
) == LABEL_REF
)
3791 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3793 return copy_rtx (def
);
3796 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3799 get_pool_constant (const_rtx addr
)
3801 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3804 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3805 and whether it has been output or not. */
3808 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3810 struct constant_descriptor_rtx
*desc
;
3812 desc
= SYMBOL_REF_CONSTANT (addr
);
3813 *pmarked
= (desc
->mark
!= 0);
3814 return desc
->constant
;
3817 /* Similar, return the mode. */
3820 get_pool_mode (const_rtx addr
)
3822 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3825 /* Return the size of the constant pool. */
3828 get_pool_size (void)
3830 return crtl
->varasm
.pool
->offset
;
3833 /* Worker function for output_constant_pool_1. Emit assembly for X
3834 in MODE with known alignment ALIGN. */
3837 output_constant_pool_2 (machine_mode mode
, rtx x
, unsigned int align
)
3839 switch (GET_MODE_CLASS (mode
))
3842 case MODE_DECIMAL_FLOAT
:
3846 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3847 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3848 assemble_real (r
, mode
, align
);
3853 case MODE_PARTIAL_INT
:
3858 case MODE_POINTER_BOUNDS
:
3859 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3862 case MODE_VECTOR_FLOAT
:
3863 case MODE_VECTOR_INT
:
3864 case MODE_VECTOR_FRACT
:
3865 case MODE_VECTOR_UFRACT
:
3866 case MODE_VECTOR_ACCUM
:
3867 case MODE_VECTOR_UACCUM
:
3870 machine_mode submode
= GET_MODE_INNER (mode
);
3871 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3873 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3874 units
= CONST_VECTOR_NUNITS (x
);
3876 for (i
= 0; i
< units
; i
++)
3878 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3879 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3889 /* Worker function for output_constant_pool. Emit constant DESC,
3890 giving it ALIGN bits of alignment. */
3893 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3900 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3901 whose CODE_LABEL has been deleted. This can occur if a jump table
3902 is eliminated by optimization. If so, write a constant of zero
3903 instead. Note that this can also happen by turning the
3904 CODE_LABEL into a NOTE. */
3905 /* ??? This seems completely and utterly wrong. Certainly it's
3906 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3907 functioning even with rtx_insn::deleted and friends. */
3910 switch (GET_CODE (tmp
))
3913 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3914 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3916 tmp
= XEXP (XEXP (tmp
, 0), 0);
3920 tmp
= LABEL_REF_LABEL (tmp
);
3921 gcc_assert (!as_a
<rtx_insn
*> (tmp
)->deleted ());
3922 gcc_assert (!NOTE_P (tmp
)
3923 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3930 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3931 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3932 align
, desc
->labelno
, done
);
3935 assemble_align (align
);
3937 /* Output the label. */
3938 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3940 /* Output the data. */
3941 output_constant_pool_2 (desc
->mode
, x
, align
);
3943 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3944 sections have proper size. */
3945 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3947 && (in_section
->common
.flags
& SECTION_MERGE
))
3948 assemble_align (align
);
3950 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3956 /* Mark all constants that are referenced by SYMBOL_REFs in X.
3957 Emit referenced deferred strings. */
3960 mark_constants_in_pattern (rtx insn
)
3962 subrtx_iterator::array_type array
;
3963 FOR_EACH_SUBRTX (iter
, array
, PATTERN (insn
), ALL
)
3965 const_rtx x
= *iter
;
3966 if (GET_CODE (x
) == SYMBOL_REF
)
3968 if (CONSTANT_POOL_ADDRESS_P (x
))
3970 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3971 if (desc
->mark
== 0)
3974 iter
.substitute (desc
->constant
);
3977 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3979 tree decl
= SYMBOL_REF_DECL (x
);
3980 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
3982 n_deferred_constants
--;
3983 output_constant_def_contents (CONST_CAST_RTX (x
));
3990 /* Look through appropriate parts of INSN, marking all entries in the
3991 constant pool which are actually being used. Entries that are only
3992 referenced by other constants are also marked as used. Emit
3993 deferred strings that are used. */
3996 mark_constants (rtx_insn
*insn
)
4001 /* Insns may appear inside a SEQUENCE. Only check the patterns of
4002 insns, not any notes that may be attached. We don't want to mark
4003 a constant just because it happens to appear in a REG_EQUIV note. */
4004 if (rtx_sequence
*seq
= dyn_cast
<rtx_sequence
*> (PATTERN (insn
)))
4006 int i
, n
= seq
->len ();
4007 for (i
= 0; i
< n
; ++i
)
4009 rtx subinsn
= seq
->element (i
);
4010 if (INSN_P (subinsn
))
4011 mark_constants_in_pattern (subinsn
);
4015 mark_constants_in_pattern (insn
);
4018 /* Look through the instructions for this function, and mark all the
4019 entries in POOL which are actually being used. Emit deferred constants
4020 which have indeed been used. */
4023 mark_constant_pool (void)
4027 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
4030 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
4031 mark_constants (insn
);
4034 /* Write all the constants in POOL. */
4037 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
4039 struct constant_descriptor_rtx
*desc
;
4041 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
4044 /* If the constant is part of an object_block, make sure that
4045 the constant has been positioned within its block, but do not
4046 write out its definition yet. output_object_blocks will do
4048 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
4049 && SYMBOL_REF_BLOCK (desc
->sym
))
4050 place_block_symbol (desc
->sym
);
4053 switch_to_section (targetm
.asm_out
.select_rtx_section
4054 (desc
->mode
, desc
->constant
, desc
->align
));
4055 output_constant_pool_1 (desc
, desc
->align
);
4060 /* Mark all constants that are used in the current function, then write
4061 out the function's private constant pool. */
4064 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
4065 tree fndecl ATTRIBUTE_UNUSED
)
4067 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
4069 /* It is possible for gcc to call force_const_mem and then to later
4070 discard the instructions which refer to the constant. In such a
4071 case we do not need to output the constant. */
4072 mark_constant_pool ();
4074 #ifdef ASM_OUTPUT_POOL_PROLOGUE
4075 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4078 output_constant_pool_contents (pool
);
4080 #ifdef ASM_OUTPUT_POOL_EPILOGUE
4081 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4085 /* Write the contents of the shared constant pool. */
4088 output_shared_constant_pool (void)
4090 output_constant_pool_contents (shared_constant_pool
);
4093 /* Determine what kind of relocations EXP may need. */
4096 compute_reloc_for_constant (tree exp
)
4098 int reloc
= 0, reloc2
;
4101 switch (TREE_CODE (exp
))
4105 /* Go inside any operations that get_inner_reference can handle and see
4106 if what's inside is a constant: no need to do anything here for
4107 addresses of variables or functions. */
4108 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4109 tem
= TREE_OPERAND (tem
, 0))
4112 if (TREE_CODE (tem
) == MEM_REF
4113 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
4115 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
4119 if (!targetm
.binds_local_p (tem
))
4126 case POINTER_PLUS_EXPR
:
4127 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4128 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4132 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4133 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4134 /* The difference of two local labels is computable at link time. */
4135 if (reloc
== 1 && reloc2
== 1)
4142 case VIEW_CONVERT_EXPR
:
4143 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4148 unsigned HOST_WIDE_INT idx
;
4149 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4151 reloc
|= compute_reloc_for_constant (tem
);
4161 /* Find all the constants whose addresses are referenced inside of EXP,
4162 and make sure assembler code with a label has been output for each one.
4163 Indicate whether an ADDR_EXPR has been encountered. */
4166 output_addressed_constants (tree exp
)
4170 switch (TREE_CODE (exp
))
4174 /* Go inside any operations that get_inner_reference can handle and see
4175 if what's inside is a constant: no need to do anything here for
4176 addresses of variables or functions. */
4177 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4178 tem
= TREE_OPERAND (tem
, 0))
4181 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4182 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4183 tem
= DECL_INITIAL (tem
);
4185 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4186 output_constant_def (tem
, 0);
4188 if (TREE_CODE (tem
) == MEM_REF
)
4189 output_addressed_constants (TREE_OPERAND (tem
, 0));
4193 case POINTER_PLUS_EXPR
:
4195 output_addressed_constants (TREE_OPERAND (exp
, 1));
4199 case VIEW_CONVERT_EXPR
:
4200 output_addressed_constants (TREE_OPERAND (exp
, 0));
4205 unsigned HOST_WIDE_INT idx
;
4206 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4208 output_addressed_constants (tem
);
4217 /* Whether a constructor CTOR is a valid static constant initializer if all
4218 its elements are. This used to be internal to initializer_constant_valid_p
4219 and has been exposed to let other functions like categorize_ctor_elements
4220 evaluate the property while walking a constructor for other purposes. */
4223 constructor_static_from_elts_p (const_tree ctor
)
4225 return (TREE_CONSTANT (ctor
)
4226 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4227 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4228 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4231 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4234 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4235 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4236 which are valid when ENDTYPE is an integer of any size; in
4237 particular, this does not accept a pointer minus a constant. This
4238 returns null_pointer_node if the VALUE is an absolute constant
4239 which can be used to initialize a static variable. Otherwise it
4243 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4247 if (!INTEGRAL_TYPE_P (endtype
))
4250 op0
= TREE_OPERAND (value
, 0);
4251 op1
= TREE_OPERAND (value
, 1);
4253 /* Like STRIP_NOPS except allow the operand mode to widen. This
4254 works around a feature of fold that simplifies (int)(p1 - p2) to
4255 ((int)p1 - (int)p2) under the theory that the narrower operation
4258 while (CONVERT_EXPR_P (op0
)
4259 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4261 tree inner
= TREE_OPERAND (op0
, 0);
4262 if (inner
== error_mark_node
4263 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4264 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4265 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4270 while (CONVERT_EXPR_P (op1
)
4271 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4273 tree inner
= TREE_OPERAND (op1
, 0);
4274 if (inner
== error_mark_node
4275 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4276 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4277 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4282 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4286 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4287 cache
? cache
+ 2 : NULL
);
4288 /* Both initializers must be known. */
4292 && (op0
== null_pointer_node
4293 || TREE_CODE (value
) == MINUS_EXPR
))
4294 return null_pointer_node
;
4296 /* Support differences between labels. */
4297 if (TREE_CODE (op0
) == LABEL_DECL
4298 && TREE_CODE (op1
) == LABEL_DECL
)
4299 return null_pointer_node
;
4301 if (TREE_CODE (op0
) == STRING_CST
4302 && TREE_CODE (op1
) == STRING_CST
4303 && operand_equal_p (op0
, op1
, 1))
4304 return null_pointer_node
;
4310 /* Helper function of initializer_constant_valid_p.
4311 Return nonzero if VALUE is a valid constant-valued expression
4312 for use in initializing a static variable; one that can be an
4313 element of a "constant" initializer.
4315 Return null_pointer_node if the value is absolute;
4316 if it is relocatable, return the variable that determines the relocation.
4317 We assume that VALUE has been folded as much as possible;
4318 therefore, we do not need to check for such things as
4319 arithmetic-combinations of integers.
4321 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4324 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4328 switch (TREE_CODE (value
))
4331 if (constructor_static_from_elts_p (value
))
4333 unsigned HOST_WIDE_INT idx
;
4335 bool absolute
= true;
4337 if (cache
&& cache
[0] == value
)
4339 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4342 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4349 cache
[1] = NULL_TREE
;
4353 if (reloc
!= null_pointer_node
)
4356 /* For a non-absolute relocation, there is no single
4357 variable that can be "the variable that determines the
4362 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4364 return absolute
? null_pointer_node
: error_mark_node
;
4367 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4375 return null_pointer_node
;
4380 tree op0
= staticp (TREE_OPERAND (value
, 0));
4383 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4384 to be a constant, this is old-skool offsetof-like nonsense. */
4385 if (TREE_CODE (op0
) == INDIRECT_REF
4386 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4387 return null_pointer_node
;
4388 /* Taking the address of a nested function involves a trampoline,
4389 unless we don't need or want one. */
4390 if (TREE_CODE (op0
) == FUNCTION_DECL
4391 && DECL_STATIC_CHAIN (op0
)
4392 && !TREE_NO_TRAMPOLINE (value
))
4394 /* "&{...}" requires a temporary to hold the constructed
4396 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4402 case NON_LVALUE_EXPR
:
4403 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4406 case VIEW_CONVERT_EXPR
:
4408 tree src
= TREE_OPERAND (value
, 0);
4409 tree src_type
= TREE_TYPE (src
);
4410 tree dest_type
= TREE_TYPE (value
);
4412 /* Allow view-conversions from aggregate to non-aggregate type only
4413 if the bit pattern is fully preserved afterwards; otherwise, the
4414 RTL expander won't be able to apply a subsequent transformation
4415 to the underlying constructor. */
4416 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4418 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4419 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4424 /* Allow all other kinds of view-conversion. */
4425 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4430 tree src
= TREE_OPERAND (value
, 0);
4431 tree src_type
= TREE_TYPE (src
);
4432 tree dest_type
= TREE_TYPE (value
);
4434 /* Allow conversions between pointer types, floating-point
4435 types, and offset types. */
4436 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4437 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4438 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4439 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4440 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4442 /* Allow length-preserving conversions between integer types. */
4443 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4444 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4445 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4447 /* Allow conversions between other integer types only if
4449 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4451 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4452 if (inner
== null_pointer_node
)
4453 return null_pointer_node
;
4457 /* Allow (int) &foo provided int is as wide as a pointer. */
4458 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4459 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4460 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4462 /* Likewise conversions from int to pointers, but also allow
4463 conversions from 0. */
4464 if ((POINTER_TYPE_P (dest_type
)
4465 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4466 && INTEGRAL_TYPE_P (src_type
))
4468 if (TREE_CODE (src
) == INTEGER_CST
4469 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4470 return null_pointer_node
;
4471 if (integer_zerop (src
))
4472 return null_pointer_node
;
4473 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4474 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4477 /* Allow conversions to struct or union types if the value
4479 if (TREE_CODE (dest_type
) == RECORD_TYPE
4480 || TREE_CODE (dest_type
) == UNION_TYPE
)
4481 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4485 case POINTER_PLUS_EXPR
:
4487 /* Any valid floating-point constants will have been folded by now;
4488 with -frounding-math we hit this with addition of two constants. */
4489 if (TREE_CODE (endtype
) == REAL_TYPE
)
4491 if (cache
&& cache
[0] == value
)
4493 if (! INTEGRAL_TYPE_P (endtype
)
4494 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4496 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4498 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4501 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4502 endtype
, ncache
+ 2);
4503 /* If either term is absolute, use the other term's relocation. */
4504 if (valid0
== null_pointer_node
)
4506 else if (valid1
== null_pointer_node
)
4508 /* Support narrowing pointer differences. */
4510 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4514 /* Support narrowing pointer differences. */
4515 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4524 if (TREE_CODE (endtype
) == REAL_TYPE
)
4526 if (cache
&& cache
[0] == value
)
4528 if (! INTEGRAL_TYPE_P (endtype
)
4529 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4531 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4533 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4536 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4537 endtype
, ncache
+ 2);
4538 /* Win if second argument is absolute. */
4539 if (valid1
== null_pointer_node
)
4541 /* Win if both arguments have the same relocation.
4542 Then the value is absolute. */
4543 else if (valid0
== valid1
&& valid0
!= 0)
4544 ret
= null_pointer_node
;
4545 /* Since GCC guarantees that string constants are unique in the
4546 generated code, a subtraction between two copies of the same
4547 constant string is absolute. */
4548 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4549 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4550 && operand_equal_p (valid0
, valid1
, 1))
4551 ret
= null_pointer_node
;
4552 /* Support narrowing differences. */
4554 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4558 /* Support narrowing differences. */
4559 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4574 /* Return nonzero if VALUE is a valid constant-valued expression
4575 for use in initializing a static variable; one that can be an
4576 element of a "constant" initializer.
4578 Return null_pointer_node if the value is absolute;
4579 if it is relocatable, return the variable that determines the relocation.
4580 We assume that VALUE has been folded as much as possible;
4581 therefore, we do not need to check for such things as
4582 arithmetic-combinations of integers. */
4584 initializer_constant_valid_p (tree value
, tree endtype
)
4586 return initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4589 /* Return true if VALUE is a valid constant-valued expression
4590 for use in initializing a static bit-field; one that can be
4591 an element of a "constant" initializer. */
4594 initializer_constant_valid_for_bitfield_p (tree value
)
4596 /* For bitfields we support integer constants or possibly nested aggregates
4598 switch (TREE_CODE (value
))
4602 unsigned HOST_WIDE_INT idx
;
4605 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4606 if (!initializer_constant_valid_for_bitfield_p (elt
))
4615 case VIEW_CONVERT_EXPR
:
4616 case NON_LVALUE_EXPR
:
4618 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4627 /* output_constructor outer state of relevance in recursive calls, typically
4628 for nested aggregate bitfields. */
4631 unsigned int bit_offset
; /* current position in ... */
4632 int byte
; /* ... the outer byte buffer. */
4635 static unsigned HOST_WIDE_INT
4636 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int,
4639 /* Output assembler code for constant EXP, with no label.
4640 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4641 Assumes output_addressed_constants has been done on EXP already.
4643 Generate at least SIZE bytes of assembler data, padding at the end
4644 with zeros if necessary. SIZE must always be specified. The returned
4645 value is the actual number of bytes of assembler data generated, which
4646 may be bigger than SIZE if the object contains a variable length field.
4648 SIZE is important for structure constructors,
4649 since trailing members may have been omitted from the constructor.
4650 It is also important for initialization of arrays from string constants
4651 since the full length of the string constant might not be wanted.
4652 It is also needed for initialization of unions, where the initializer's
4653 type is just one member, and that may not be as long as the union.
4655 There a case in which we would fail to output exactly SIZE bytes:
4656 for a structure constructor that wants to produce more than SIZE bytes.
4657 But such constructors will never be generated for any possible input.
4659 ALIGN is the alignment of the data in bits. */
4661 static unsigned HOST_WIDE_INT
4662 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4664 enum tree_code code
;
4665 unsigned HOST_WIDE_INT thissize
;
4667 if (size
== 0 || flag_syntax_only
)
4670 /* See if we're trying to initialize a pointer in a non-default mode
4671 to the address of some declaration somewhere. If the target says
4672 the mode is valid for pointers, assume the target has a way of
4674 if (TREE_CODE (exp
) == NOP_EXPR
4675 && POINTER_TYPE_P (TREE_TYPE (exp
))
4676 && targetm
.addr_space
.valid_pointer_mode
4677 (TYPE_MODE (TREE_TYPE (exp
)),
4678 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4680 tree saved_type
= TREE_TYPE (exp
);
4682 /* Peel off any intermediate conversions-to-pointer for valid
4684 while (TREE_CODE (exp
) == NOP_EXPR
4685 && POINTER_TYPE_P (TREE_TYPE (exp
))
4686 && targetm
.addr_space
.valid_pointer_mode
4687 (TYPE_MODE (TREE_TYPE (exp
)),
4688 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4689 exp
= TREE_OPERAND (exp
, 0);
4691 /* If what we're left with is the address of something, we can
4692 convert the address to the final type and output it that
4694 if (TREE_CODE (exp
) == ADDR_EXPR
)
4695 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4696 /* Likewise for constant ints. */
4697 else if (TREE_CODE (exp
) == INTEGER_CST
)
4698 exp
= wide_int_to_tree (saved_type
, exp
);
4702 /* Eliminate any conversions since we'll be outputting the underlying
4704 while (CONVERT_EXPR_P (exp
)
4705 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4706 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4708 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4709 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4711 /* Make sure eliminating the conversion is really a no-op, except with
4712 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4713 union types to allow for Ada unchecked unions. */
4714 if (type_size
> op_size
4715 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4716 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4717 /* Keep the conversion. */
4720 exp
= TREE_OPERAND (exp
, 0);
4723 code
= TREE_CODE (TREE_TYPE (exp
));
4724 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4726 /* Allow a constructor with no elements for any data type.
4727 This means to fill the space with zeros. */
4728 if (TREE_CODE (exp
) == CONSTRUCTOR
4729 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4731 assemble_zeros (size
);
4735 if (TREE_CODE (exp
) == FDESC_EXPR
)
4737 #ifdef ASM_OUTPUT_FDESC
4738 HOST_WIDE_INT part
= tree_to_shwi (TREE_OPERAND (exp
, 1));
4739 tree decl
= TREE_OPERAND (exp
, 0);
4740 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4747 /* Now output the underlying data. If we've handling the padding, return.
4748 Otherwise, break and ensure SIZE is the size written. */
4755 case REFERENCE_TYPE
:
4757 case FIXED_POINT_TYPE
:
4758 case POINTER_BOUNDS_TYPE
:
4760 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4761 EXPAND_INITIALIZER
),
4762 MIN (size
, thissize
), align
, 0))
4763 error ("initializer for integer/fixed-point value is too complicated");
4767 if (TREE_CODE (exp
) != REAL_CST
)
4768 error ("initializer for floating value is not a floating constant");
4770 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4774 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4775 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4776 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4781 switch (TREE_CODE (exp
))
4784 return output_constructor (exp
, size
, align
, NULL
);
4787 = MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
), size
);
4788 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4792 machine_mode inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4793 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4794 int elt_size
= GET_MODE_SIZE (inner
);
4795 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
);
4796 thissize
= elt_size
;
4797 for (unsigned int i
= 1; i
< VECTOR_CST_NELTS (exp
); i
++)
4799 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
);
4800 thissize
+= elt_size
;
4811 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4812 return output_constructor (exp
, size
, align
, NULL
);
4821 if (size
> thissize
)
4822 assemble_zeros (size
- thissize
);
4828 /* Subroutine of output_constructor, used for computing the size of
4829 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4830 type with an unspecified upper bound. */
4832 static unsigned HOST_WIDE_INT
4833 array_size_for_constructor (tree val
)
4836 unsigned HOST_WIDE_INT cnt
;
4837 tree index
, value
, tmp
;
4840 /* This code used to attempt to handle string constants that are not
4841 arrays of single-bytes, but nothing else does, so there's no point in
4843 if (TREE_CODE (val
) == STRING_CST
)
4844 return TREE_STRING_LENGTH (val
);
4846 max_index
= NULL_TREE
;
4847 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4849 if (TREE_CODE (index
) == RANGE_EXPR
)
4850 index
= TREE_OPERAND (index
, 1);
4851 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4855 if (max_index
== NULL_TREE
)
4858 /* Compute the total number of array elements. */
4859 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4860 i
= wi::to_offset (max_index
) - wi::to_offset (tmp
) + 1;
4862 /* Multiply by the array element unit size to find number of bytes. */
4863 i
*= wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4865 gcc_assert (wi::fits_uhwi_p (i
));
4866 return i
.to_uhwi ();
4869 /* Other datastructures + helpers for output_constructor. */
4871 /* output_constructor local state to support interaction with helpers. */
4875 /* Received arguments. */
4876 tree exp
; /* Constructor expression. */
4877 tree type
; /* Type of constructor expression. */
4878 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4879 unsigned int align
; /* Known initial alignment. */
4880 tree min_index
; /* Lower bound if specified for an array. */
4882 /* Output processing state. */
4883 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4884 int byte
; /* Part of a bitfield byte yet to be output. */
4885 int last_relative_index
; /* Implicit or explicit index of the last
4886 array element output within a bitfield. */
4887 bool byte_buffer_in_use
; /* Whether BYTE is in use. */
4889 /* Current element. */
4890 tree field
; /* Current field decl in a record. */
4891 tree val
; /* Current element value. */
4892 tree index
; /* Current element index. */
4896 /* Helper for output_constructor. From the current LOCAL state, output a
4897 RANGE_EXPR element. */
4900 output_constructor_array_range (oc_local_state
*local
)
4902 unsigned HOST_WIDE_INT fieldsize
4903 = int_size_in_bytes (TREE_TYPE (local
->type
));
4905 HOST_WIDE_INT lo_index
4906 = tree_to_shwi (TREE_OPERAND (local
->index
, 0));
4907 HOST_WIDE_INT hi_index
4908 = tree_to_shwi (TREE_OPERAND (local
->index
, 1));
4909 HOST_WIDE_INT index
;
4912 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4914 for (index
= lo_index
; index
<= hi_index
; index
++)
4916 /* Output the element's initial value. */
4917 if (local
->val
== NULL_TREE
)
4918 assemble_zeros (fieldsize
);
4920 fieldsize
= output_constant (local
->val
, fieldsize
, align2
);
4922 /* Count its size. */
4923 local
->total_bytes
+= fieldsize
;
4927 /* Helper for output_constructor. From the current LOCAL state, output a
4928 field element that is not true bitfield or part of an outer one. */
4931 output_constructor_regular_field (oc_local_state
*local
)
4933 /* Field size and position. Since this structure is static, we know the
4934 positions are constant. */
4935 unsigned HOST_WIDE_INT fieldsize
;
4936 HOST_WIDE_INT fieldpos
;
4938 unsigned int align2
;
4940 if (local
->index
!= NULL_TREE
)
4942 /* Perform the index calculation in modulo arithmetic but
4943 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4944 but we are using an unsigned sizetype. */
4945 unsigned prec
= TYPE_PRECISION (sizetype
);
4946 offset_int idx
= wi::sext (wi::to_offset (local
->index
)
4947 - wi::to_offset (local
->min_index
), prec
);
4948 fieldpos
= (idx
* wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
))))
4951 else if (local
->field
!= NULL_TREE
)
4952 fieldpos
= int_byte_position (local
->field
);
4956 /* Output any buffered-up bit-fields preceding this element. */
4957 if (local
->byte_buffer_in_use
)
4959 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4960 local
->total_bytes
++;
4961 local
->byte_buffer_in_use
= false;
4964 /* Advance to offset of this element.
4965 Note no alignment needed in an array, since that is guaranteed
4966 if each element has the proper size. */
4967 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4968 && fieldpos
> local
->total_bytes
)
4970 assemble_zeros (fieldpos
- local
->total_bytes
);
4971 local
->total_bytes
= fieldpos
;
4974 /* Find the alignment of this element. */
4975 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
4977 /* Determine size this element should occupy. */
4982 /* If this is an array with an unspecified upper bound,
4983 the initializer determines the size. */
4984 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4985 but we cannot do this until the deprecated support for
4986 initializing zero-length array members is removed. */
4987 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
4988 && TYPE_DOMAIN (TREE_TYPE (local
->field
))
4989 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
))))
4991 fieldsize
= array_size_for_constructor (local
->val
);
4992 /* Given a non-empty initialization, this field had
4994 gcc_assert (!fieldsize
|| !DECL_CHAIN (local
->field
));
4997 fieldsize
= tree_to_uhwi (DECL_SIZE_UNIT (local
->field
));
5000 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
5002 /* Output the element's initial value. */
5003 if (local
->val
== NULL_TREE
)
5004 assemble_zeros (fieldsize
);
5006 fieldsize
= output_constant (local
->val
, fieldsize
, align2
);
5008 /* Count its size. */
5009 local
->total_bytes
+= fieldsize
;
5012 /* Helper for output_constructor. From the LOCAL state, output an element
5013 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
5014 from the start of a possibly ongoing outer byte buffer. */
5017 output_constructor_bitfield (oc_local_state
*local
, unsigned int bit_offset
)
5019 /* Bit size of this element. */
5020 HOST_WIDE_INT ebitsize
5022 ? tree_to_uhwi (DECL_SIZE (local
->field
))
5023 : tree_to_uhwi (TYPE_SIZE (TREE_TYPE (local
->type
))));
5025 /* Relative index of this element if this is an array component. */
5026 HOST_WIDE_INT relative_index
5029 ? (tree_to_shwi (local
->index
)
5030 - tree_to_shwi (local
->min_index
))
5031 : local
->last_relative_index
+ 1)
5034 /* Bit position of this element from the start of the containing
5036 HOST_WIDE_INT constructor_relative_ebitpos
5038 ? int_bit_position (local
->field
)
5039 : ebitsize
* relative_index
);
5041 /* Bit position of this element from the start of a possibly ongoing
5042 outer byte buffer. */
5043 HOST_WIDE_INT byte_relative_ebitpos
5044 = bit_offset
+ constructor_relative_ebitpos
;
5046 /* From the start of a possibly ongoing outer byte buffer, offsets to
5047 the first bit of this element and to the first bit past the end of
5049 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
5050 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
5052 local
->last_relative_index
= relative_index
;
5054 if (local
->val
== NULL_TREE
)
5055 local
->val
= integer_zero_node
;
5057 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
5058 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
5059 local
->val
= TREE_OPERAND (local
->val
, 0);
5061 if (TREE_CODE (local
->val
) != INTEGER_CST
5062 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
5064 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
5068 /* If this field does not start in this (or next) byte, skip some bytes. */
5069 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5071 /* Output remnant of any bit field in previous bytes. */
5072 if (local
->byte_buffer_in_use
)
5074 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5075 local
->total_bytes
++;
5076 local
->byte_buffer_in_use
= false;
5079 /* If still not at proper byte, advance to there. */
5080 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5082 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
5083 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
5084 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
5088 /* Set up the buffer if necessary. */
5089 if (!local
->byte_buffer_in_use
)
5093 local
->byte_buffer_in_use
= true;
5096 /* If this is nested constructor, recurse passing the bit offset and the
5097 pending data, then retrieve the new pending data afterwards. */
5098 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
5100 oc_outer_state temp_state
;
5101 temp_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
5102 temp_state
.byte
= local
->byte
;
5104 += output_constructor (local
->val
, 0, 0, &temp_state
);
5105 local
->byte
= temp_state
.byte
;
5109 /* Otherwise, we must split the element into pieces that fall within
5110 separate bytes, and combine each byte with previous or following
5112 while (next_offset
< end_offset
)
5116 HOST_WIDE_INT value
;
5117 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
5118 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
5120 /* Advance from byte to byte within this element when necessary. */
5121 while (next_byte
!= local
->total_bytes
)
5123 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5124 local
->total_bytes
++;
5128 /* Number of bits we can process at once (all part of the same byte). */
5129 this_time
= MIN (end_offset
- next_offset
, BITS_PER_UNIT
- next_bit
);
5130 if (BYTES_BIG_ENDIAN
)
5132 /* On big-endian machine, take the most significant bits (of the
5133 bits that are significant) first and put them into bytes from
5134 the most significant end. */
5135 shift
= end_offset
- next_offset
- this_time
;
5137 /* Don't try to take a bunch of bits that cross
5138 the word boundary in the INTEGER_CST. We can
5139 only select bits from one element. */
5140 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5141 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5143 const int end
= shift
+ this_time
- 1;
5144 shift
= end
& -HOST_BITS_PER_WIDE_INT
;
5145 this_time
= end
- shift
+ 1;
5148 /* Now get the bits from the appropriate constant word. */
5149 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5150 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5152 /* Get the result. This works only when:
5153 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5154 local
->byte
|= (((value
>> shift
)
5155 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5156 << (BITS_PER_UNIT
- this_time
- next_bit
));
5160 /* On little-endian machines, take the least significant bits of
5161 the value first and pack them starting at the least significant
5162 bits of the bytes. */
5163 shift
= next_offset
- byte_relative_ebitpos
;
5165 /* Don't try to take a bunch of bits that cross
5166 the word boundary in the INTEGER_CST. We can
5167 only select bits from one element. */
5168 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5169 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5171 = HOST_BITS_PER_WIDE_INT
- (shift
& (HOST_BITS_PER_WIDE_INT
- 1));
5173 /* Now get the bits from the appropriate constant word. */
5174 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5175 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5177 /* Get the result. This works only when:
5178 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5179 local
->byte
|= (((value
>> shift
)
5180 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5184 next_offset
+= this_time
;
5185 local
->byte_buffer_in_use
= true;
5189 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5190 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5191 caller output state of relevance in recursive invocations. */
5193 static unsigned HOST_WIDE_INT
5194 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
5195 unsigned int align
, oc_outer_state
*outer
)
5197 unsigned HOST_WIDE_INT cnt
;
5198 constructor_elt
*ce
;
5200 oc_local_state local
;
5202 /* Setup our local state to communicate with helpers. */
5204 local
.type
= TREE_TYPE (exp
);
5206 local
.align
= align
;
5207 if (TREE_CODE (local
.type
) == ARRAY_TYPE
&& TYPE_DOMAIN (local
.type
))
5208 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5210 local
.min_index
= NULL_TREE
;
5212 local
.total_bytes
= 0;
5213 local
.byte_buffer_in_use
= outer
!= NULL
;
5214 local
.byte
= outer
? outer
->byte
: 0;
5215 local
.last_relative_index
= -1;
5217 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5219 /* As CE goes through the elements of the constant, FIELD goes through the
5220 structure fields if the constant is a structure. If the constant is a
5221 union, we override this by getting the field from the TREE_LIST element.
5222 But the constant could also be an array. Then FIELD is zero.
5224 There is always a maximum of one element in the chain LINK for unions
5225 (even if the initializer in a source program incorrectly contains
5228 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5229 local
.field
= TYPE_FIELDS (local
.type
);
5231 local
.field
= NULL_TREE
;
5234 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5235 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5237 local
.val
= ce
->value
;
5238 local
.index
= NULL_TREE
;
5240 /* The element in a union constructor specifies the proper field
5242 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5243 local
.field
= ce
->index
;
5245 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5246 local
.index
= ce
->index
;
5248 if (local
.field
&& flag_verbose_asm
)
5249 fprintf (asm_out_file
, "%s %s:\n",
5251 DECL_NAME (local
.field
)
5252 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5255 /* Eliminate the marker that makes a cast not be an lvalue. */
5256 if (local
.val
!= NULL_TREE
)
5257 STRIP_NOPS (local
.val
);
5259 /* Output the current element, using the appropriate helper ... */
5261 /* For an array slice not part of an outer bitfield. */
5263 && local
.index
!= NULL_TREE
5264 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5265 output_constructor_array_range (&local
);
5267 /* For a field that is neither a true bitfield nor part of an outer one,
5268 known to be at least byte aligned and multiple-of-bytes long. */
5270 && (local
.field
== NULL_TREE
5271 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5272 output_constructor_regular_field (&local
);
5274 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5275 supported for scalar fields, so we may need to convert first. */
5278 if (TREE_CODE (local
.val
) == REAL_CST
)
5280 = fold_unary (VIEW_CONVERT_EXPR
,
5281 build_nonstandard_integer_type
5282 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5284 output_constructor_bitfield (&local
, outer
? outer
->bit_offset
: 0);
5288 /* If we are not at toplevel, save the pending data for our caller.
5289 Otherwise output the pending data and padding zeros as needed. */
5291 outer
->byte
= local
.byte
;
5294 if (local
.byte_buffer_in_use
)
5296 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5297 local
.total_bytes
++;
5300 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5302 assemble_zeros (local
.size
- local
.total_bytes
);
5303 local
.total_bytes
= local
.size
;
5307 return local
.total_bytes
;
5310 /* Mark DECL as weak. */
5313 mark_weak (tree decl
)
5315 if (DECL_WEAK (decl
))
5318 struct symtab_node
*n
= symtab_node::get (decl
);
5319 if (n
&& n
->refuse_visibility_changes
)
5320 error ("%+D declared weak after being used", decl
);
5321 DECL_WEAK (decl
) = 1;
5323 if (DECL_RTL_SET_P (decl
)
5324 && MEM_P (DECL_RTL (decl
))
5325 && XEXP (DECL_RTL (decl
), 0)
5326 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5327 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5330 /* Merge weak status between NEWDECL and OLDDECL. */
5333 merge_weak (tree newdecl
, tree olddecl
)
5335 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5337 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5340 /* We put the NEWDECL on the weak_decls list at some point
5341 and OLDDECL as well. Keep just OLDDECL on the list. */
5342 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5343 if (TREE_VALUE (*pwd
) == newdecl
)
5345 *pwd
= TREE_CHAIN (*pwd
);
5352 if (DECL_WEAK (newdecl
))
5356 /* NEWDECL is weak, but OLDDECL is not. */
5358 /* If we already output the OLDDECL, we're in trouble; we can't
5359 go back and make it weak. This should never happen in
5360 unit-at-a-time compilation. */
5361 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5363 /* If we've already generated rtl referencing OLDDECL, we may
5364 have done so in a way that will not function properly with
5365 a weak symbol. Again in unit-at-a-time this should be
5367 gcc_assert (!TREE_USED (olddecl
)
5368 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5370 if (TARGET_SUPPORTS_WEAK
)
5372 /* We put the NEWDECL on the weak_decls list at some point.
5373 Replace it with the OLDDECL. */
5374 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5375 if (TREE_VALUE (wd
) == newdecl
)
5377 TREE_VALUE (wd
) = olddecl
;
5380 /* We may not find the entry on the list. If NEWDECL is a
5381 weak alias, then we will have already called
5382 globalize_decl to remove the entry; in that case, we do
5383 not need to do anything. */
5386 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5387 mark_weak (olddecl
);
5390 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5391 weak. Just update NEWDECL to indicate that it's weak too. */
5392 mark_weak (newdecl
);
5395 /* Declare DECL to be a weak symbol. */
5398 declare_weak (tree decl
)
5400 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5401 if (! TREE_PUBLIC (decl
))
5402 error ("weak declaration of %q+D must be public", decl
);
5403 else if (!TARGET_SUPPORTS_WEAK
)
5404 warning (0, "weak declaration of %q+D not supported", decl
);
5407 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5408 DECL_ATTRIBUTES (decl
)
5409 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5413 weak_finish_1 (tree decl
)
5415 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5416 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5419 if (! TREE_USED (decl
))
5422 #ifdef ASM_WEAKEN_DECL
5423 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5425 #ifdef ASM_WEAKEN_LABEL
5426 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5428 #ifdef ASM_OUTPUT_WEAK_ALIAS
5430 static bool warn_once
= 0;
5433 warning (0, "only weak aliases are supported in this configuration");
5443 /* Fiven an assembly name, find the decl it is associated with. */
5445 find_decl (tree target
)
5447 symtab_node
*node
= symtab_node::get_for_asmname (target
);
5453 /* This TREE_LIST contains weakref targets. */
5455 static GTY(()) tree weakref_targets
;
5457 /* Emit any pending weak declarations. */
5464 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5466 tree alias_decl
= TREE_PURPOSE (t
);
5467 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5469 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5470 /* Remove alias_decl from the weak list, but leave entries for
5471 the target alone. */
5473 #ifndef ASM_OUTPUT_WEAKREF
5474 else if (! TREE_SYMBOL_REFERENCED (target
))
5476 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5477 defined, otherwise we and weak_finish_1 would use
5478 different macros. */
5479 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5480 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5482 tree decl
= find_decl (target
);
5486 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5487 TREE_CODE (alias_decl
), target
,
5488 TREE_TYPE (alias_decl
));
5490 DECL_EXTERNAL (decl
) = 1;
5491 TREE_PUBLIC (decl
) = 1;
5492 DECL_ARTIFICIAL (decl
) = 1;
5493 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5494 TREE_USED (decl
) = 1;
5497 weak_finish_1 (decl
);
5506 /* Remove the alias and the target from the pending weak list
5507 so that we do not emit any .weak directives for the former,
5508 nor multiple .weak directives for the latter. */
5509 for (p
= &weak_decls
; (t2
= *p
) ; )
5511 if (TREE_VALUE (t2
) == alias_decl
5512 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5513 *p
= TREE_CHAIN (t2
);
5515 p
= &TREE_CHAIN (t2
);
5518 /* Remove other weakrefs to the same target, to speed things up. */
5519 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5521 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5522 *p
= TREE_CHAIN (t2
);
5524 p
= &TREE_CHAIN (t2
);
5529 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5531 tree decl
= TREE_VALUE (t
);
5533 weak_finish_1 (decl
);
5537 /* Emit the assembly bits to indicate that DECL is globally visible. */
5540 globalize_decl (tree decl
)
5543 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5544 if (DECL_WEAK (decl
))
5546 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5549 #ifdef ASM_WEAKEN_DECL
5550 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5552 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5555 /* Remove this function from the pending weak list so that
5556 we do not emit multiple .weak directives for it. */
5557 for (p
= &weak_decls
; (t
= *p
) ; )
5559 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5560 *p
= TREE_CHAIN (t
);
5562 p
= &TREE_CHAIN (t
);
5565 /* Remove weakrefs to the same target from the pending weakref
5566 list, for the same reason. */
5567 for (p
= &weakref_targets
; (t
= *p
) ; )
5569 if (DECL_ASSEMBLER_NAME (decl
)
5570 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5571 *p
= TREE_CHAIN (t
);
5573 p
= &TREE_CHAIN (t
);
5580 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5583 vec
<alias_pair
, va_gc
> *alias_pairs
;
5585 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5586 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5587 tree node is DECL to have the value of the tree node TARGET. */
5590 do_assemble_alias (tree decl
, tree target
)
5594 /* Emulated TLS had better not get this var. */
5595 gcc_assert (!(!targetm
.have_tls
5596 && TREE_CODE (decl
) == VAR_DECL
5597 && DECL_THREAD_LOCAL_P (decl
)));
5599 if (TREE_ASM_WRITTEN (decl
))
5602 id
= DECL_ASSEMBLER_NAME (decl
);
5603 ultimate_transparent_alias_target (&id
);
5604 ultimate_transparent_alias_target (&target
);
5606 /* We must force creation of DECL_RTL for debug info generation, even though
5607 we don't use it here. */
5608 make_decl_rtl (decl
);
5610 TREE_ASM_WRITTEN (decl
) = 1;
5611 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5612 TREE_ASM_WRITTEN (id
) = 1;
5614 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5616 if (!TREE_SYMBOL_REFERENCED (target
))
5617 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5619 #ifdef ASM_OUTPUT_WEAKREF
5620 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5621 IDENTIFIER_POINTER (id
),
5622 IDENTIFIER_POINTER (target
));
5624 if (!TARGET_SUPPORTS_WEAK
)
5626 error_at (DECL_SOURCE_LOCATION (decl
),
5627 "weakref is not supported in this configuration");
5634 #ifdef ASM_OUTPUT_DEF
5635 tree orig_decl
= decl
;
5637 if (TREE_CODE (decl
) == FUNCTION_DECL
5638 && cgraph_node::get (decl
)->instrumentation_clone
5639 && cgraph_node::get (decl
)->instrumented_version
)
5640 orig_decl
= cgraph_node::get (decl
)->instrumented_version
->decl
;
5642 /* Make name accessible from other files, if appropriate. */
5644 if (TREE_PUBLIC (decl
) || TREE_PUBLIC (orig_decl
))
5646 globalize_decl (decl
);
5647 maybe_assemble_visibility (decl
);
5649 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5651 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5652 if (targetm
.has_ifunc_p ())
5653 ASM_OUTPUT_TYPE_DIRECTIVE
5654 (asm_out_file
, IDENTIFIER_POINTER (id
),
5658 error_at (DECL_SOURCE_LOCATION (decl
),
5659 "ifunc is not supported on this target");
5662 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5663 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5665 ASM_OUTPUT_DEF (asm_out_file
,
5666 IDENTIFIER_POINTER (id
),
5667 IDENTIFIER_POINTER (target
));
5669 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5674 name
= IDENTIFIER_POINTER (id
);
5675 # ifdef ASM_WEAKEN_DECL
5676 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5678 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5680 /* Remove this function from the pending weak list so that
5681 we do not emit multiple .weak directives for it. */
5682 for (p
= &weak_decls
; (t
= *p
) ; )
5683 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
))
5684 || id
== DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5685 *p
= TREE_CHAIN (t
);
5687 p
= &TREE_CHAIN (t
);
5689 /* Remove weakrefs to the same target from the pending weakref
5690 list, for the same reason. */
5691 for (p
= &weakref_targets
; (t
= *p
) ; )
5693 if (id
== ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5694 *p
= TREE_CHAIN (t
);
5696 p
= &TREE_CHAIN (t
);
5702 /* Emit an assembler directive to make the symbol for DECL an alias to
5703 the symbol for TARGET. */
5706 assemble_alias (tree decl
, tree target
)
5710 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5712 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5714 ultimate_transparent_alias_target (&target
);
5716 if (alias
== target
)
5717 error ("weakref %q+D ultimately targets itself", decl
);
5718 if (TREE_PUBLIC (decl
))
5719 error ("weakref %q+D must have static linkage", decl
);
5723 #if !defined (ASM_OUTPUT_DEF)
5724 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5725 error_at (DECL_SOURCE_LOCATION (decl
),
5726 "alias definitions not supported in this configuration");
5727 TREE_ASM_WRITTEN (decl
) = 1;
5730 if (!DECL_WEAK (decl
))
5732 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5733 error_at (DECL_SOURCE_LOCATION (decl
),
5734 "ifunc is not supported in this configuration");
5736 error_at (DECL_SOURCE_LOCATION (decl
),
5737 "only weak aliases are supported in this configuration");
5738 TREE_ASM_WRITTEN (decl
) = 1;
5744 TREE_USED (decl
) = 1;
5746 /* Allow aliases to aliases. */
5747 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5748 cgraph_node::get_create (decl
)->alias
= true;
5750 varpool_node::get_create (decl
)->alias
= true;
5752 /* If the target has already been emitted, we don't have to queue the
5753 alias. This saves a tad of memory. */
5754 if (symtab
->global_info_ready
)
5755 target_decl
= find_decl (target
);
5758 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5759 || symtab
->state
>= EXPANSION
)
5760 do_assemble_alias (decl
, target
);
5763 alias_pair p
= {decl
, target
};
5764 vec_safe_push (alias_pairs
, p
);
5768 /* Record and output a table of translations from original function
5769 to its transaction aware clone. Note that tm_pure functions are
5770 considered to be their own clone. */
5772 struct tm_clone_hasher
: ggc_cache_hasher
<tree_map
*>
5774 static hashval_t
hash (tree_map
*m
) { return tree_map_hash (m
); }
5775 static bool equal (tree_map
*a
, tree_map
*b
) { return tree_map_eq (a
, b
); }
5777 static void handle_cache_entry (tree_map
*&e
)
5779 if (e
!= HTAB_EMPTY_ENTRY
|| e
!= HTAB_DELETED_ENTRY
)
5781 extern void gt_ggc_mx (tree_map
*&);
5782 if (ggc_marked_p (e
->base
.from
))
5785 e
= static_cast<tree_map
*> (HTAB_DELETED_ENTRY
);
5791 hash_table
<tm_clone_hasher
> *tm_clone_hash
;
5794 record_tm_clone_pair (tree o
, tree n
)
5796 struct tree_map
**slot
, *h
;
5798 if (tm_clone_hash
== NULL
)
5799 tm_clone_hash
= hash_table
<tm_clone_hasher
>::create_ggc (32);
5801 h
= ggc_alloc
<tree_map
> ();
5802 h
->hash
= htab_hash_pointer (o
);
5806 slot
= tm_clone_hash
->find_slot_with_hash (h
, h
->hash
, INSERT
);
5811 get_tm_clone_pair (tree o
)
5815 struct tree_map
*h
, in
;
5818 in
.hash
= htab_hash_pointer (o
);
5819 h
= tm_clone_hash
->find_with_hash (&in
, in
.hash
);
5826 typedef struct tm_alias_pair
5834 /* Dump the actual pairs to the .tm_clone_table section. */
5837 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5841 bool switched
= false;
5843 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5847 struct cgraph_node
*src_n
= cgraph_node::get (src
);
5848 struct cgraph_node
*dst_n
= cgraph_node::get (dst
);
5850 /* The function ipa_tm_create_version() marks the clone as needed if
5851 the original function was needed. But we also mark the clone as
5852 needed if we ever called the clone indirectly through
5853 TM_GETTMCLONE. If neither of these are true, we didn't generate
5854 a clone, and we didn't call it indirectly... no sense keeping it
5855 in the clone table. */
5856 if (!dst_n
|| !dst_n
->definition
)
5859 /* This covers the case where we have optimized the original
5860 function away, and only access the transactional clone. */
5861 if (!src_n
|| !src_n
->definition
)
5866 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5867 assemble_align (POINTER_SIZE
);
5871 assemble_integer (XEXP (DECL_RTL (src
), 0),
5872 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
5873 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5874 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
5878 /* Provide a default for the tm_clone_table section. */
5881 default_clone_table_section (void)
5883 return get_named_section (NULL
, ".tm_clone_table", 3);
5886 /* Helper comparison function for qsorting by the DECL_UID stored in
5887 alias_pair->emitted_diags. */
5890 tm_alias_pair_cmp (const void *x
, const void *y
)
5892 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5893 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5894 if (p1
->uid
< p2
->uid
)
5896 if (p1
->uid
> p2
->uid
)
5902 finish_tm_clone_pairs (void)
5904 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5906 if (tm_clone_hash
== NULL
)
5909 /* We need a determenistic order for the .tm_clone_table, otherwise
5910 we will get bootstrap comparison failures, so dump the hash table
5911 to a vector, sort it, and dump the vector. */
5913 /* Dump the hashtable to a vector. */
5915 hash_table
<tm_clone_hasher
>::iterator iter
;
5916 FOR_EACH_HASH_TABLE_ELEMENT (*tm_clone_hash
, map
, tree_map
*, iter
)
5918 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5919 tm_alias_pairs
.safe_push (p
);
5922 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5925 dump_tm_clone_pairs (tm_alias_pairs
);
5927 tm_clone_hash
->empty ();
5928 tm_clone_hash
= NULL
;
5929 tm_alias_pairs
.release ();
5933 /* Emit an assembler directive to set symbol for DECL visibility to
5934 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5937 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5938 int vis ATTRIBUTE_UNUSED
)
5940 #ifdef HAVE_GAS_HIDDEN
5941 static const char * const visibility_types
[] = {
5942 NULL
, "protected", "hidden", "internal"
5945 const char *name
, *type
;
5948 id
= DECL_ASSEMBLER_NAME (decl
);
5949 ultimate_transparent_alias_target (&id
);
5950 name
= IDENTIFIER_POINTER (id
);
5952 type
= visibility_types
[vis
];
5954 fprintf (asm_out_file
, "\t.%s\t", type
);
5955 assemble_name (asm_out_file
, name
);
5956 fprintf (asm_out_file
, "\n");
5958 if (!DECL_ARTIFICIAL (decl
))
5959 warning (OPT_Wattributes
, "visibility attribute not supported "
5960 "in this configuration; ignored");
5964 /* A helper function to call assemble_visibility when needed for a decl. */
5967 maybe_assemble_visibility (tree decl
)
5969 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5971 if (TREE_CODE (decl
) == FUNCTION_DECL
5972 && cgraph_node::get (decl
)
5973 && cgraph_node::get (decl
)->instrumentation_clone
5974 && cgraph_node::get (decl
)->instrumented_version
)
5975 vis
= DECL_VISIBILITY (cgraph_node::get (decl
)->instrumented_version
->decl
);
5977 if (vis
!= VISIBILITY_DEFAULT
)
5979 targetm
.asm_out
.assemble_visibility (decl
, vis
);
5986 /* Returns 1 if the target configuration supports defining public symbols
5987 so that one of them will be chosen at link time instead of generating a
5988 multiply-defined symbol error, whether through the use of weak symbols or
5989 a target-specific mechanism for having duplicates discarded. */
5992 supports_one_only (void)
5994 if (SUPPORTS_ONE_ONLY
)
5996 return TARGET_SUPPORTS_WEAK
;
5999 /* Set up DECL as a public symbol that can be defined in multiple
6000 translation units without generating a linker error. */
6003 make_decl_one_only (tree decl
, tree comdat_group
)
6005 struct symtab_node
*symbol
;
6006 gcc_assert (TREE_CODE (decl
) == VAR_DECL
6007 || TREE_CODE (decl
) == FUNCTION_DECL
);
6009 TREE_PUBLIC (decl
) = 1;
6011 if (TREE_CODE (decl
) == VAR_DECL
)
6012 symbol
= varpool_node::get_create (decl
);
6014 symbol
= cgraph_node::get_create (decl
);
6016 if (SUPPORTS_ONE_ONLY
)
6018 #ifdef MAKE_DECL_ONE_ONLY
6019 MAKE_DECL_ONE_ONLY (decl
);
6021 symbol
->set_comdat_group (comdat_group
);
6023 else if (TREE_CODE (decl
) == VAR_DECL
6024 && (DECL_INITIAL (decl
) == 0
6025 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6026 DECL_COMMON (decl
) = 1;
6029 gcc_assert (TARGET_SUPPORTS_WEAK
);
6030 DECL_WEAK (decl
) = 1;
6035 init_varasm_once (void)
6037 section_htab
= hash_table
<section_hasher
>::create_ggc (31);
6038 object_block_htab
= hash_table
<object_block_hasher
>::create_ggc (31);
6039 const_desc_htab
= hash_table
<tree_descriptor_hasher
>::create_ggc (1009);
6041 shared_constant_pool
= create_constant_pool ();
6043 #ifdef TEXT_SECTION_ASM_OP
6044 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
6045 TEXT_SECTION_ASM_OP
);
6048 #ifdef DATA_SECTION_ASM_OP
6049 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6050 DATA_SECTION_ASM_OP
);
6053 #ifdef SDATA_SECTION_ASM_OP
6054 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6055 SDATA_SECTION_ASM_OP
);
6058 #ifdef READONLY_DATA_SECTION_ASM_OP
6059 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
6060 READONLY_DATA_SECTION_ASM_OP
);
6063 #ifdef CTORS_SECTION_ASM_OP
6064 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
6065 CTORS_SECTION_ASM_OP
);
6068 #ifdef DTORS_SECTION_ASM_OP
6069 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
6070 DTORS_SECTION_ASM_OP
);
6073 #ifdef BSS_SECTION_ASM_OP
6074 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6075 output_section_asm_op
,
6076 BSS_SECTION_ASM_OP
);
6079 #ifdef SBSS_SECTION_ASM_OP
6080 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6081 output_section_asm_op
,
6082 SBSS_SECTION_ASM_OP
);
6085 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6086 | SECTION_COMMON
, emit_tls_common
);
6087 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6088 | SECTION_COMMON
, emit_local
);
6089 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6090 | SECTION_COMMON
, emit_common
);
6092 #if defined ASM_OUTPUT_ALIGNED_BSS
6093 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
6097 targetm
.asm_out
.init_sections ();
6099 if (readonly_data_section
== NULL
)
6100 readonly_data_section
= text_section
;
6102 #ifdef ASM_OUTPUT_EXTERNAL
6103 pending_assemble_externals_set
= new hash_set
<tree
>;
6108 decl_default_tls_model (const_tree decl
)
6110 enum tls_model kind
;
6113 is_local
= targetm
.binds_local_p (decl
);
6117 kind
= TLS_MODEL_LOCAL_EXEC
;
6119 kind
= TLS_MODEL_INITIAL_EXEC
;
6122 /* Local dynamic is inefficient when we're not combining the
6123 parts of the address. */
6124 else if (optimize
&& is_local
)
6125 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
6127 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
6128 if (kind
< flag_tls_default
)
6129 kind
= flag_tls_default
;
6134 /* Select a set of attributes for section NAME based on the properties
6135 of DECL and whether or not RELOC indicates that DECL's initializer
6136 might contain runtime relocations.
6138 We make the section read-only and executable for a function decl,
6139 read-only for a const data decl, and writable for a non-const data decl. */
6142 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6146 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6147 flags
= SECTION_CODE
;
6150 enum section_category category
6151 = categorize_decl_for_section (decl
, reloc
);
6152 if (decl_readonly_section_1 (category
))
6154 else if (category
== SECCAT_DATA_REL_RO
6155 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6156 flags
= SECTION_WRITE
| SECTION_RELRO
;
6158 flags
= SECTION_WRITE
;
6162 flags
= SECTION_WRITE
;
6163 if (strcmp (name
, ".data.rel.ro") == 0
6164 || strcmp (name
, ".data.rel.ro.local") == 0)
6165 flags
|= SECTION_RELRO
;
6168 if (decl
&& DECL_P (decl
) && DECL_COMDAT_GROUP (decl
))
6169 flags
|= SECTION_LINKONCE
;
6171 if (strcmp (name
, ".vtable_map_vars") == 0)
6172 flags
|= SECTION_LINKONCE
;
6174 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6175 flags
|= SECTION_TLS
| SECTION_WRITE
;
6177 if (strcmp (name
, ".bss") == 0
6178 || strncmp (name
, ".bss.", 5) == 0
6179 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6180 || strcmp (name
, ".persistent.bss") == 0
6181 || strcmp (name
, ".sbss") == 0
6182 || strncmp (name
, ".sbss.", 6) == 0
6183 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6184 flags
|= SECTION_BSS
;
6186 if (strcmp (name
, ".tdata") == 0
6187 || strncmp (name
, ".tdata.", 7) == 0
6188 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6189 flags
|= SECTION_TLS
;
6191 if (strcmp (name
, ".tbss") == 0
6192 || strncmp (name
, ".tbss.", 6) == 0
6193 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6194 flags
|= SECTION_TLS
| SECTION_BSS
;
6196 /* These three sections have special ELF types. They are neither
6197 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6198 want to print a section type (@progbits or @nobits). If someone
6199 is silly enough to emit code or TLS variables to one of these
6200 sections, then don't handle them specially. */
6201 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6202 && (strcmp (name
, ".init_array") == 0
6203 || strcmp (name
, ".fini_array") == 0
6204 || strcmp (name
, ".preinit_array") == 0))
6205 flags
|= SECTION_NOTYPE
;
6210 /* Return true if the target supports some form of global BSS,
6211 either through bss_noswitch_section, or by selecting a BSS
6212 section in TARGET_ASM_SELECT_SECTION. */
6215 have_global_bss_p (void)
6217 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6220 /* Output assembly to switch to section NAME with attribute FLAGS.
6221 Four variants for common object file formats. */
6224 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6225 unsigned int flags ATTRIBUTE_UNUSED
,
6226 tree decl ATTRIBUTE_UNUSED
)
6228 /* Some object formats don't support named sections at all. The
6229 front-end should already have flagged this as an error. */
6233 #ifndef TLS_SECTION_ASM_FLAG
6234 #define TLS_SECTION_ASM_FLAG 'T'
6238 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6239 tree decl ATTRIBUTE_UNUSED
)
6241 char flagchars
[10], *f
= flagchars
;
6243 /* If we have already declared this section, we can use an
6244 abbreviated form to switch back to it -- unless this section is
6245 part of a COMDAT groups, in which case GAS requires the full
6246 declaration every time. */
6247 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6248 && (flags
& SECTION_DECLARED
))
6250 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6254 if (!(flags
& SECTION_DEBUG
))
6256 #if defined (HAVE_GAS_SECTION_EXCLUDE) && HAVE_GAS_SECTION_EXCLUDE == 1
6257 if (flags
& SECTION_EXCLUDE
)
6260 if (flags
& SECTION_WRITE
)
6262 if (flags
& SECTION_CODE
)
6264 if (flags
& SECTION_SMALL
)
6266 if (flags
& SECTION_MERGE
)
6268 if (flags
& SECTION_STRINGS
)
6270 if (flags
& SECTION_TLS
)
6271 *f
++ = TLS_SECTION_ASM_FLAG
;
6272 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6276 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6278 if (!(flags
& SECTION_NOTYPE
))
6283 if (flags
& SECTION_BSS
)
6289 /* On platforms that use "@" as the assembly comment character,
6291 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6293 fprintf (asm_out_file
, format
, type
);
6295 if (flags
& SECTION_ENTSIZE
)
6296 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6297 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6299 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6300 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6302 fprintf (asm_out_file
, ",%s,comdat",
6303 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6307 putc ('\n', asm_out_file
);
6311 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6312 tree decl ATTRIBUTE_UNUSED
)
6314 char flagchars
[8], *f
= flagchars
;
6316 if (flags
& SECTION_WRITE
)
6318 if (flags
& SECTION_CODE
)
6322 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6326 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6329 default_coff_asm_named_section (name
, flags
, decl
);
6331 if (flags
& SECTION_LINKONCE
)
6333 /* Functions may have been compiled at various levels of
6334 optimization so we can't use `same_size' here.
6335 Instead, have the linker pick one. */
6336 fprintf (asm_out_file
, "\t.linkonce %s\n",
6337 (flags
& SECTION_CODE
? "discard" : "same_size"));
6341 /* The lame default section selector. */
6344 default_select_section (tree decl
, int reloc
,
6345 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6349 if (decl_readonly_section (decl
, reloc
))
6350 return readonly_data_section
;
6352 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6354 if (! ((flag_pic
&& reloc
)
6355 || !TREE_READONLY (decl
)
6356 || TREE_SIDE_EFFECTS (decl
)
6357 || !TREE_CONSTANT (decl
)))
6358 return readonly_data_section
;
6360 else if (TREE_CODE (decl
) == STRING_CST
)
6361 return readonly_data_section
;
6362 else if (! (flag_pic
&& reloc
))
6363 return readonly_data_section
;
6365 return data_section
;
6368 enum section_category
6369 categorize_decl_for_section (const_tree decl
, int reloc
)
6371 enum section_category ret
;
6373 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6375 else if (TREE_CODE (decl
) == STRING_CST
)
6377 if ((flag_sanitize
& SANITIZE_ADDRESS
)
6378 && asan_protect_global (CONST_CAST_TREE (decl
)))
6379 /* or !flag_merge_constants */
6380 return SECCAT_RODATA
;
6382 return SECCAT_RODATA_MERGE_STR
;
6384 else if (TREE_CODE (decl
) == VAR_DECL
)
6386 if (bss_initializer_p (decl
))
6388 else if (! TREE_READONLY (decl
)
6389 || TREE_SIDE_EFFECTS (decl
)
6390 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6392 /* Here the reloc_rw_mask is not testing whether the section should
6393 be read-only or not, but whether the dynamic link will have to
6394 do something. If so, we wish to segregate the data in order to
6395 minimize cache misses inside the dynamic linker. */
6396 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6397 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6401 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6402 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6403 else if (reloc
|| flag_merge_constants
< 2
6404 || ((flag_sanitize
& SANITIZE_ADDRESS
)
6405 && asan_protect_global (CONST_CAST_TREE (decl
))))
6406 /* C and C++ don't allow different variables to share the same
6407 location. -fmerge-all-constants allows even that (at the
6408 expense of not conforming). */
6409 ret
= SECCAT_RODATA
;
6410 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6411 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6413 ret
= SECCAT_RODATA_MERGE_CONST
;
6415 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6417 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6418 || TREE_SIDE_EFFECTS (decl
)
6419 || ! TREE_CONSTANT (decl
))
6422 ret
= SECCAT_RODATA
;
6425 ret
= SECCAT_RODATA
;
6427 /* There are no read-only thread-local sections. */
6428 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6430 /* Note that this would be *just* SECCAT_BSS, except that there's
6431 no concept of a read-only thread-local-data section. */
6432 if (ret
== SECCAT_BSS
6433 || (flag_zero_initialized_in_bss
6434 && initializer_zerop (DECL_INITIAL (decl
))))
6440 /* If the target uses small data sections, select it. */
6441 else if (targetm
.in_small_data_p (decl
))
6443 if (ret
== SECCAT_BSS
)
6445 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6446 ret
= SECCAT_SRODATA
;
6455 decl_readonly_section_1 (enum section_category category
)
6460 case SECCAT_RODATA_MERGE_STR
:
6461 case SECCAT_RODATA_MERGE_STR_INIT
:
6462 case SECCAT_RODATA_MERGE_CONST
:
6463 case SECCAT_SRODATA
:
6471 decl_readonly_section (const_tree decl
, int reloc
)
6473 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6476 /* Select a section based on the above categorization. */
6479 default_elf_select_section (tree decl
, int reloc
,
6480 unsigned HOST_WIDE_INT align
)
6483 switch (categorize_decl_for_section (decl
, reloc
))
6486 /* We're not supposed to be called on FUNCTION_DECLs. */
6489 return readonly_data_section
;
6490 case SECCAT_RODATA_MERGE_STR
:
6491 return mergeable_string_section (decl
, align
, 0);
6492 case SECCAT_RODATA_MERGE_STR_INIT
:
6493 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6494 case SECCAT_RODATA_MERGE_CONST
:
6495 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6496 case SECCAT_SRODATA
:
6500 return data_section
;
6501 case SECCAT_DATA_REL
:
6502 sname
= ".data.rel";
6504 case SECCAT_DATA_REL_LOCAL
:
6505 sname
= ".data.rel.local";
6507 case SECCAT_DATA_REL_RO
:
6508 sname
= ".data.rel.ro";
6510 case SECCAT_DATA_REL_RO_LOCAL
:
6511 sname
= ".data.rel.ro.local";
6534 return get_named_section (decl
, sname
, reloc
);
6537 /* Construct a unique section name based on the decl name and the
6538 categorization performed above. */
6541 default_unique_section (tree decl
, int reloc
)
6543 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6544 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6545 const char *prefix
, *name
, *linkonce
;
6549 switch (categorize_decl_for_section (decl
, reloc
))
6552 prefix
= one_only
? ".t" : ".text";
6555 case SECCAT_RODATA_MERGE_STR
:
6556 case SECCAT_RODATA_MERGE_STR_INIT
:
6557 case SECCAT_RODATA_MERGE_CONST
:
6558 prefix
= one_only
? ".r" : ".rodata";
6560 case SECCAT_SRODATA
:
6561 prefix
= one_only
? ".s2" : ".sdata2";
6564 prefix
= one_only
? ".d" : ".data";
6566 case SECCAT_DATA_REL
:
6567 prefix
= one_only
? ".d.rel" : ".data.rel";
6569 case SECCAT_DATA_REL_LOCAL
:
6570 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6572 case SECCAT_DATA_REL_RO
:
6573 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6575 case SECCAT_DATA_REL_RO_LOCAL
:
6576 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6579 prefix
= one_only
? ".s" : ".sdata";
6582 prefix
= one_only
? ".b" : ".bss";
6585 prefix
= one_only
? ".sb" : ".sbss";
6588 prefix
= one_only
? ".td" : ".tdata";
6591 prefix
= one_only
? ".tb" : ".tbss";
6597 id
= DECL_ASSEMBLER_NAME (decl
);
6598 ultimate_transparent_alias_target (&id
);
6599 name
= IDENTIFIER_POINTER (id
);
6600 name
= targetm
.strip_name_encoding (name
);
6602 /* If we're using one_only, then there needs to be a .gnu.linkonce
6603 prefix to the section name. */
6604 linkonce
= one_only
? ".gnu.linkonce" : "";
6606 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6608 set_decl_section_name (decl
, string
);
6611 /* Subroutine of compute_reloc_for_rtx for leaf rtxes. */
6614 compute_reloc_for_rtx_1 (const_rtx x
)
6616 switch (GET_CODE (x
))
6619 return SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6627 /* Like compute_reloc_for_constant, except for an RTX. The return value
6628 is a mask for which bit 1 indicates a global relocation, and bit 0
6629 indicates a local relocation. */
6632 compute_reloc_for_rtx (const_rtx x
)
6634 switch (GET_CODE (x
))
6638 return compute_reloc_for_rtx_1 (x
);
6643 subrtx_iterator::array_type array
;
6644 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
6645 reloc
|= compute_reloc_for_rtx_1 (*iter
);
6655 default_select_rtx_section (machine_mode mode ATTRIBUTE_UNUSED
,
6657 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6659 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6660 return data_section
;
6662 return readonly_data_section
;
6666 default_elf_select_rtx_section (machine_mode mode
, rtx x
,
6667 unsigned HOST_WIDE_INT align
)
6669 int reloc
= compute_reloc_for_rtx (x
);
6671 /* ??? Handle small data here somehow. */
6673 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6676 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6678 return get_named_section (NULL
, ".data.rel.ro", 3);
6681 return mergeable_constant_section (mode
, align
, 0);
6684 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6687 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6692 /* Careful not to prod global register variables. */
6695 symbol
= XEXP (rtl
, 0);
6696 if (GET_CODE (symbol
) != SYMBOL_REF
)
6699 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6700 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6701 flags
|= SYMBOL_FLAG_FUNCTION
;
6702 if (targetm
.binds_local_p (decl
))
6703 flags
|= SYMBOL_FLAG_LOCAL
;
6704 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6705 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6706 else if (targetm
.in_small_data_p (decl
))
6707 flags
|= SYMBOL_FLAG_SMALL
;
6708 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6709 being PUBLIC, the thing *must* be defined in this translation unit.
6710 Prevent this buglet from being propagated into rtl code as well. */
6711 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6712 flags
|= SYMBOL_FLAG_EXTERNAL
;
6714 SYMBOL_REF_FLAGS (symbol
) = flags
;
6717 /* By default, we do nothing for encode_section_info, so we need not
6718 do anything but discard the '*' marker. */
6721 default_strip_name_encoding (const char *str
)
6723 return str
+ (*str
== '*');
6726 #ifdef ASM_OUTPUT_DEF
6727 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6728 anchor relative to ".", the current section position. */
6731 default_asm_output_anchor (rtx symbol
)
6735 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6736 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6737 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6741 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6744 default_use_anchors_for_symbol_p (const_rtx symbol
)
6749 /* Don't use anchors for mergeable sections. The linker might move
6750 the objects around. */
6751 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6752 if (sect
->common
.flags
& SECTION_MERGE
)
6755 /* Don't use anchors for small data sections. The small data register
6756 acts as an anchor for such sections. */
6757 if (sect
->common
.flags
& SECTION_SMALL
)
6760 decl
= SYMBOL_REF_DECL (symbol
);
6761 if (decl
&& DECL_P (decl
))
6763 /* Don't use section anchors for decls that might be defined or
6764 usurped by other modules. */
6765 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
6768 /* Don't use section anchors for decls that will be placed in a
6769 small data section. */
6770 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6771 one above. The problem is that we only use SECTION_SMALL for
6772 sections that should be marked as small in the section directive. */
6773 if (targetm
.in_small_data_p (decl
))
6779 /* Return true when RESOLUTION indicate that symbol will be bound to the
6780 definition provided by current .o file. */
6783 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6785 return (resolution
== LDPR_PREVAILING_DEF
6786 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6787 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6790 /* Return true when RESOLUTION indicate that symbol will be bound locally
6791 within current executable or DSO. */
6794 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6796 return (resolution
== LDPR_PREVAILING_DEF
6797 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6798 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6799 || resolution
== LDPR_PREEMPTED_REG
6800 || resolution
== LDPR_PREEMPTED_IR
6801 || resolution
== LDPR_RESOLVED_IR
6802 || resolution
== LDPR_RESOLVED_EXEC
);
6805 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6806 wrt cross-module name binding. */
6809 default_binds_local_p (const_tree exp
)
6811 return default_binds_local_p_1 (exp
, flag_shlib
);
6815 default_binds_local_p_1 (const_tree exp
, int shlib
)
6818 bool resolved_locally
= false;
6819 bool resolved_to_local_def
= false;
6821 /* With resolution file in hands, take look into resolutions.
6822 We can't just return true for resolved_locally symbols,
6823 because dynamic linking might overwrite symbols
6824 in shared libraries. */
6825 if (TREE_CODE (exp
) == VAR_DECL
&& TREE_PUBLIC (exp
)
6826 && (TREE_STATIC (exp
) || DECL_EXTERNAL (exp
)))
6828 varpool_node
*vnode
= varpool_node::get (exp
);
6829 if (vnode
&& (resolution_local_p (vnode
->resolution
) || vnode
->in_other_partition
))
6830 resolved_locally
= true;
6832 && resolution_to_local_definition_p (vnode
->resolution
))
6833 resolved_to_local_def
= true;
6835 else if (TREE_CODE (exp
) == FUNCTION_DECL
&& TREE_PUBLIC (exp
))
6837 struct cgraph_node
*node
= cgraph_node::get (exp
);
6839 && (resolution_local_p (node
->resolution
) || node
->in_other_partition
))
6840 resolved_locally
= true;
6842 && resolution_to_local_definition_p (node
->resolution
))
6843 resolved_to_local_def
= true;
6846 /* A non-decl is an entry in the constant pool. */
6849 /* Weakrefs may not bind locally, even though the weakref itself is always
6850 static and therefore local. Similarly, the resolver for ifunc functions
6851 might resolve to a non-local function.
6852 FIXME: We can resolve the weakref case more curefuly by looking at the
6854 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6855 || (TREE_CODE (exp
) == FUNCTION_DECL
6856 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6858 /* Static variables are always local. */
6859 else if (! TREE_PUBLIC (exp
))
6861 /* A variable is local if the user has said explicitly that it will
6863 else if ((DECL_VISIBILITY_SPECIFIED (exp
)
6864 || resolved_to_local_def
)
6865 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6867 /* Variables defined outside this object might not be local. */
6868 else if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6870 /* If defined in this object and visibility is not default, must be
6872 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6874 /* Default visibility weak data can be overridden by a strong symbol
6875 in another module and so are not local. */
6876 else if (DECL_WEAK (exp
)
6877 && !resolved_locally
)
6879 /* If PIC, then assume that any global name can be overridden by
6880 symbols resolved from other modules. */
6883 /* Uninitialized COMMON variable may be unified with symbols
6884 resolved from other modules. */
6885 else if (DECL_COMMON (exp
)
6886 && !resolved_locally
6887 && (DECL_INITIAL (exp
) == NULL
6888 || (!in_lto_p
&& DECL_INITIAL (exp
) == error_mark_node
)))
6890 /* Otherwise we're left with initialized (or non-common) global data
6891 which is of necessity defined locally. */
6898 /* Return true when references to DECL must bind to current definition in
6901 The condition is usually equivalent to whether the function binds to the
6902 current module (shared library or executable), that is to binds_local_p.
6903 We use this fact to avoid need for another target hook and implement
6904 the logic using binds_local_p and just special cases where
6905 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6906 the weak definitions (that can be overwritten at linktime by other
6907 definition from different object file) and when resolution info is available
6908 we simply use the knowledge passed to us by linker plugin. */
6910 decl_binds_to_current_def_p (const_tree decl
)
6912 gcc_assert (DECL_P (decl
));
6913 if (!targetm
.binds_local_p (decl
))
6915 if (!TREE_PUBLIC (decl
))
6917 /* When resolution is available, just use it. */
6918 if (TREE_CODE (decl
) == VAR_DECL
6919 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)))
6921 varpool_node
*vnode
= varpool_node::get (decl
);
6923 && vnode
->resolution
!= LDPR_UNKNOWN
)
6924 return resolution_to_local_definition_p (vnode
->resolution
);
6926 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
6928 struct cgraph_node
*node
= cgraph_node::get (decl
);
6930 && node
->resolution
!= LDPR_UNKNOWN
)
6931 return resolution_to_local_definition_p (node
->resolution
);
6933 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6934 binds locally but still can be overwritten), DECL_COMMON (can be merged
6935 with a non-common definition somewhere in the same module) or
6937 This rely on fact that binds_local_p behave as decl_replaceable_p
6938 for all other declaration types. */
6939 if (DECL_WEAK (decl
))
6941 if (DECL_COMMON (decl
)
6942 && (DECL_INITIAL (decl
) == NULL
6943 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6945 if (DECL_EXTERNAL (decl
))
6950 /* A replaceable function or variable is one which may be replaced
6951 at link-time with an entirely different definition, provided that the
6952 replacement has the same type. For example, functions declared
6953 with __attribute__((weak)) on most systems are replaceable.
6955 COMDAT functions are not replaceable, since all definitions of the
6956 function must be equivalent. It is important that COMDAT functions
6957 not be treated as replaceable so that use of C++ template
6958 instantiations is not penalized. */
6961 decl_replaceable_p (tree decl
)
6963 gcc_assert (DECL_P (decl
));
6964 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
6966 if (!flag_semantic_interposition
6967 && !DECL_WEAK (decl
))
6969 return !decl_binds_to_current_def_p (decl
);
6972 /* Default function to output code that will globalize a label. A
6973 target must define GLOBAL_ASM_OP or provide its own function to
6974 globalize a label. */
6975 #ifdef GLOBAL_ASM_OP
6977 default_globalize_label (FILE * stream
, const char *name
)
6979 fputs (GLOBAL_ASM_OP
, stream
);
6980 assemble_name (stream
, name
);
6981 putc ('\n', stream
);
6983 #endif /* GLOBAL_ASM_OP */
6985 /* Default function to output code that will globalize a declaration. */
6987 default_globalize_decl_name (FILE * stream
, tree decl
)
6989 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6990 targetm
.asm_out
.globalize_label (stream
, name
);
6993 /* Default function to output a label for unwind information. The
6994 default is to do nothing. A target that needs nonlocal labels for
6995 unwind information must provide its own function to do this. */
6997 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6998 tree decl ATTRIBUTE_UNUSED
,
6999 int for_eh ATTRIBUTE_UNUSED
,
7000 int empty ATTRIBUTE_UNUSED
)
7004 /* Default function to output a label to divide up the exception table.
7005 The default is to do nothing. A target that needs/wants to divide
7006 up the table must provide it's own function to do this. */
7008 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
7012 /* This is how to output an internal numbered label where PREFIX is
7013 the class of label and LABELNO is the number within the class. */
7016 default_generate_internal_label (char *buf
, const char *prefix
,
7017 unsigned long labelno
)
7019 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7022 /* This is how to output an internal numbered label where PREFIX is
7023 the class of label and LABELNO is the number within the class. */
7026 default_internal_label (FILE *stream
, const char *prefix
,
7027 unsigned long labelno
)
7029 char *const buf
= (char *) alloca (40 + strlen (prefix
));
7030 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7031 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
7035 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
7038 default_asm_declare_constant_name (FILE *file
, const char *name
,
7039 const_tree exp ATTRIBUTE_UNUSED
,
7040 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
7042 assemble_label (file
, name
);
7045 /* This is the default behavior at the beginning of a file. It's
7046 controlled by two other target-hook toggles. */
7048 default_file_start (void)
7050 if (targetm
.asm_file_start_app_off
7051 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
7052 fputs (ASM_APP_OFF
, asm_out_file
);
7054 if (targetm
.asm_file_start_file_directive
)
7055 output_file_directive (asm_out_file
, main_input_filename
);
7058 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
7059 which emits a special section directive used to indicate whether or
7060 not this object file needs an executable stack. This is primarily
7061 a GNU extension to ELF but could be used on other targets. */
7063 int trampolines_created
;
7066 file_end_indicate_exec_stack (void)
7068 unsigned int flags
= SECTION_DEBUG
;
7069 if (trampolines_created
)
7070 flags
|= SECTION_CODE
;
7072 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
7075 /* Emit a special section directive to indicate that this object file
7076 was compiled with -fsplit-stack. This is used to let the linker
7077 detect calls between split-stack code and non-split-stack code, so
7078 that it can modify the split-stack code to allocate a sufficiently
7079 large stack. We emit another special section if there are any
7080 functions in this file which have the no_split_stack attribute, to
7081 prevent the linker from warning about being unable to convert the
7082 functions if they call non-split-stack code. */
7085 file_end_indicate_split_stack (void)
7087 if (flag_split_stack
)
7089 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
7091 if (saw_no_split_stack
)
7092 switch_to_section (get_section (".note.GNU-no-split-stack",
7093 SECTION_DEBUG
, NULL
));
7097 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
7098 a get_unnamed_section callback. */
7101 output_section_asm_op (const void *directive
)
7103 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
7106 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
7107 the current section is NEW_SECTION. */
7110 switch_to_section (section
*new_section
)
7112 if (in_section
== new_section
)
7115 if (new_section
->common
.flags
& SECTION_FORGET
)
7118 in_section
= new_section
;
7120 switch (SECTION_STYLE (new_section
))
7123 targetm
.asm_out
.named_section (new_section
->named
.name
,
7124 new_section
->named
.common
.flags
,
7125 new_section
->named
.decl
);
7128 case SECTION_UNNAMED
:
7129 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
7132 case SECTION_NOSWITCH
:
7137 new_section
->common
.flags
|= SECTION_DECLARED
;
7140 /* If block symbol SYMBOL has not yet been assigned an offset, place
7141 it at the end of its block. */
7144 place_block_symbol (rtx symbol
)
7146 unsigned HOST_WIDE_INT size
, mask
, offset
;
7147 struct constant_descriptor_rtx
*desc
;
7148 unsigned int alignment
;
7149 struct object_block
*block
;
7152 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7153 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7156 /* Work out the symbol's size and alignment. */
7157 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7159 desc
= SYMBOL_REF_CONSTANT (symbol
);
7160 alignment
= desc
->align
;
7161 size
= GET_MODE_SIZE (desc
->mode
);
7163 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7165 decl
= SYMBOL_REF_DECL (symbol
);
7166 alignment
= DECL_ALIGN (decl
);
7167 size
= get_constant_size (DECL_INITIAL (decl
));
7168 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7169 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7170 && asan_protect_global (DECL_INITIAL (decl
)))
7171 size
+= asan_red_zone_size (size
);
7175 struct symtab_node
*snode
;
7176 decl
= SYMBOL_REF_DECL (symbol
);
7178 snode
= symtab_node::get (decl
);
7181 rtx target
= DECL_RTL (snode
->ultimate_alias_target ()->decl
);
7183 place_block_symbol (target
);
7184 SYMBOL_REF_BLOCK_OFFSET (symbol
) = SYMBOL_REF_BLOCK_OFFSET (target
);
7187 alignment
= get_variable_align (decl
);
7188 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7189 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7190 && asan_protect_global (decl
))
7192 size
+= asan_red_zone_size (size
);
7193 alignment
= MAX (alignment
,
7194 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7198 /* Calculate the object's offset from the start of the block. */
7199 block
= SYMBOL_REF_BLOCK (symbol
);
7200 mask
= alignment
/ BITS_PER_UNIT
- 1;
7201 offset
= (block
->size
+ mask
) & ~mask
;
7202 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7204 /* Record the block's new alignment and size. */
7205 block
->alignment
= MAX (block
->alignment
, alignment
);
7206 block
->size
= offset
+ size
;
7208 vec_safe_push (block
->objects
, symbol
);
7211 /* Return the anchor that should be used to address byte offset OFFSET
7212 from the first object in BLOCK. MODEL is the TLS model used
7216 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7217 enum tls_model model
)
7220 unsigned int begin
, middle
, end
;
7221 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7224 /* Work out the anchor's offset. Use an offset of 0 for the first
7225 anchor so that we don't pessimize the case where we take the address
7226 of a variable at the beginning of the block. This is particularly
7227 useful when a block has only one variable assigned to it.
7229 We try to place anchors RANGE bytes apart, so there can then be
7230 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7231 a ptr_mode offset. With some target settings, the lowest such
7232 anchor might be out of range for the lowest ptr_mode offset;
7233 likewise the highest anchor for the highest offset. Use anchors
7234 at the extreme ends of the ptr_mode range in such cases.
7236 All arithmetic uses unsigned integers in order to avoid
7238 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7239 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7240 range
= max_offset
- min_offset
+ 1;
7245 bias
= HOST_WIDE_INT_1U
<< (GET_MODE_BITSIZE (ptr_mode
) - 1);
7248 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7249 delta
-= delta
% range
;
7252 offset
= (HOST_WIDE_INT
) (-delta
);
7256 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7257 delta
-= delta
% range
;
7258 if (delta
> bias
- 1)
7260 offset
= (HOST_WIDE_INT
) delta
;
7264 /* Do a binary search to see if there's already an anchor we can use.
7265 Set BEGIN to the new anchor's index if not. */
7267 end
= vec_safe_length (block
->anchors
);
7268 while (begin
!= end
)
7270 middle
= (end
+ begin
) / 2;
7271 anchor
= (*block
->anchors
)[middle
];
7272 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7274 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7276 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7278 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7284 /* Create a new anchor with a unique label. */
7285 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7286 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7287 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7288 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7290 /* Insert it at index BEGIN. */
7291 vec_safe_insert (block
->anchors
, begin
, anchor
);
7295 /* Output the objects in BLOCK. */
7298 output_object_block (struct object_block
*block
)
7300 struct constant_descriptor_rtx
*desc
;
7302 HOST_WIDE_INT offset
;
7306 if (!block
->objects
)
7309 /* Switch to the section and make sure that the first byte is
7310 suitably aligned. */
7311 switch_to_section (block
->sect
);
7312 assemble_align (block
->alignment
);
7314 /* Define the values of all anchors relative to the current section
7316 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7317 targetm
.asm_out
.output_anchor (symbol
);
7319 /* Output the objects themselves. */
7321 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7323 /* Move to the object's offset, padding with zeros if necessary. */
7324 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7325 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7326 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7328 desc
= SYMBOL_REF_CONSTANT (symbol
);
7329 output_constant_pool_1 (desc
, 1);
7330 offset
+= GET_MODE_SIZE (desc
->mode
);
7332 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7335 decl
= SYMBOL_REF_DECL (symbol
);
7336 assemble_constant_contents (DECL_INITIAL (decl
), XSTR (symbol
, 0),
7338 size
= get_constant_size (DECL_INITIAL (decl
));
7340 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7341 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7342 && asan_protect_global (DECL_INITIAL (decl
)))
7344 size
= asan_red_zone_size (size
);
7345 assemble_zeros (size
);
7352 decl
= SYMBOL_REF_DECL (symbol
);
7353 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7354 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7356 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7357 && asan_protect_global (decl
))
7359 size
= asan_red_zone_size (size
);
7360 assemble_zeros (size
);
7367 /* A htab_traverse callback used to call output_object_block for
7368 each member of object_block_htab. */
7371 output_object_block_htab (object_block
**slot
, void *)
7373 output_object_block (*slot
);
7377 /* Output the definitions of all object_blocks. */
7380 output_object_blocks (void)
7382 object_block_htab
->traverse
<void *, output_object_block_htab
> (NULL
);
7385 /* This function provides a possible implementation of the
7386 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7387 by -frecord-gcc-switches it creates a new mergeable, string section in the
7388 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7389 contains the switches in ASCII format.
7391 FIXME: This code does not correctly handle double quote characters
7392 that appear inside strings, (it strips them rather than preserving them).
7393 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7394 characters - instead it treats them as sub-string separators. Since
7395 we want to emit NUL strings terminators into the object file we have to use
7399 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7403 case SWITCH_TYPE_PASSED
:
7404 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7405 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7408 case SWITCH_TYPE_DESCRIPTIVE
:
7411 /* Distinguish between invocations where name is NULL. */
7412 static bool started
= false;
7418 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7422 | (SECTION_ENTSIZE
& 1),
7424 switch_to_section (sec
);
7433 /* The return value is currently ignored by the caller, but must be 0.
7434 For -fverbose-asm the return value would be the number of characters
7435 emitted into the assembler file. */
7439 /* Emit text to declare externally defined symbols. It is needed to
7440 properly support non-default visibility. */
7442 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7444 const char *name ATTRIBUTE_UNUSED
)
7446 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7447 set in order to avoid putting out names that are never really
7449 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7450 && targetm
.binds_local_p (decl
))
7451 maybe_assemble_visibility (decl
);
7454 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7457 default_asm_output_source_filename (FILE *file
, const char *name
)
7459 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7460 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7462 fprintf (file
, "\t.file\t");
7463 output_quoted_string (file
, name
);
7468 /* Output a file name in the form wanted by System V. */
7471 output_file_directive (FILE *asm_file
, const char *input_name
)
7476 if (input_name
== NULL
)
7477 input_name
= "<stdin>";
7479 input_name
= remap_debug_filename (input_name
);
7481 len
= strlen (input_name
);
7482 na
= input_name
+ len
;
7484 /* NA gets INPUT_NAME sans directory names. */
7485 while (na
> input_name
)
7487 if (IS_DIR_SEPARATOR (na
[-1]))
7492 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7495 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7498 make_debug_expr_from_rtl (const_rtx exp
)
7500 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7501 machine_mode mode
= GET_MODE (exp
);
7504 DECL_ARTIFICIAL (ddecl
) = 1;
7505 if (REG_P (exp
) && REG_EXPR (exp
))
7506 type
= TREE_TYPE (REG_EXPR (exp
));
7507 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7508 type
= TREE_TYPE (MEM_EXPR (exp
));
7511 if (type
&& TYPE_MODE (type
) == mode
)
7512 TREE_TYPE (ddecl
) = type
;
7514 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7515 DECL_MODE (ddecl
) = mode
;
7516 dval
= gen_rtx_DEBUG_EXPR (mode
);
7517 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7518 SET_DECL_RTL (ddecl
, dval
);
7522 #ifdef ELF_ASCII_ESCAPES
7523 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7526 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7531 fputs (STRING_ASM_OP
, f
);
7536 escape
= ELF_ASCII_ESCAPES
[c
];
7543 /* TODO: Print in hex with fast function, important for -flto. */
7544 fprintf (f
, "\\%03o", c
);
7557 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7560 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7562 const char *limit
= s
+ len
;
7563 const char *last_null
= NULL
;
7564 unsigned bytes_in_chunk
= 0;
7568 for (; s
< limit
; s
++)
7572 if (bytes_in_chunk
>= 60)
7581 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7588 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7590 if (bytes_in_chunk
> 0)
7597 default_elf_asm_output_limited_string (f
, s
);
7602 if (bytes_in_chunk
== 0)
7603 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7606 escape
= ELF_ASCII_ESCAPES
[c
];
7614 /* TODO: Print in hex with fast function, important for -flto. */
7615 fprintf (f
, "\\%03o", c
);
7616 bytes_in_chunk
+= 4;
7621 bytes_in_chunk
+= 2;
7628 if (bytes_in_chunk
> 0)
7636 static GTY(()) section
*elf_init_array_section
;
7637 static GTY(()) section
*elf_fini_array_section
;
7640 get_elf_initfini_array_priority_section (int priority
,
7644 if (priority
!= DEFAULT_INIT_PRIORITY
)
7647 sprintf (buf
, "%s.%.5u",
7648 constructor_p
? ".init_array" : ".fini_array",
7650 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7656 if (elf_init_array_section
== NULL
)
7657 elf_init_array_section
7658 = get_section (".init_array",
7659 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7660 sec
= elf_init_array_section
;
7664 if (elf_fini_array_section
== NULL
)
7665 elf_fini_array_section
7666 = get_section (".fini_array",
7667 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7668 sec
= elf_fini_array_section
;
7674 /* Use .init_array section for constructors. */
7677 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7679 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7681 assemble_addr_to_section (symbol
, sec
);
7684 /* Use .fini_array section for destructors. */
7687 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7689 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7691 assemble_addr_to_section (symbol
, sec
);
7694 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7696 This is a bit of a cheat. The real default is a no-op, but this
7697 hook is the default for all targets with a .ident directive. */
7700 default_asm_output_ident_directive (const char *ident_str
)
7702 const char *ident_asm_op
= "\t.ident\t";
7704 /* If we are still in the front end, do not write out the string
7705 to asm_out_file. Instead, add a fake top-level asm statement.
7706 This allows the front ends to use this hook without actually
7707 writing to asm_out_file, to handle #ident or Pragma Ident. */
7708 if (symtab
->state
== PARSING
)
7710 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7711 symtab
->finalize_toplevel_asm (build_string (strlen (buf
), buf
));
7714 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7717 #include "gt-varasm.h"