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
,
662 symtab_node::get (decl
)->definition_alignment ());
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 **t
= &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
) == VAR_DECL
&& DECL_HARD_REGISTER (decl
))
1640 || (TREE_CODE (decl
) != FUNCTION_DECL
1641 && (TREE_CODE (decl
) != VAR_DECL
1642 || (DECL_COMMON (decl
)
1643 && (DECL_INITIAL (decl
) == 0
1644 || DECL_INITIAL (decl
) == error_mark_node
)))))
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 t
= &weak_global_object_name
;
1654 tree id
= DECL_ASSEMBLER_NAME (decl
);
1655 ultimate_transparent_alias_target (&id
);
1656 *t
= ggc_strdup (targetm
.strip_name_encoding (IDENTIFIER_POINTER (id
)));
1660 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1661 current function goes into the cold section, so that targets can use
1662 current_function_section during RTL expansion. DECL describes the
1666 decide_function_section (tree decl
)
1668 first_function_block_is_cold
= false;
1670 if (flag_reorder_blocks_and_partition
)
1671 /* We will decide in assemble_start_function. */
1674 if (DECL_SECTION_NAME (decl
))
1676 struct cgraph_node
*node
= cgraph_node::get (current_function_decl
);
1677 /* Calls to function_section rely on first_function_block_is_cold
1679 first_function_block_is_cold
= (node
1681 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1684 in_cold_section_p
= first_function_block_is_cold
;
1687 /* Get the function's name, as described by its RTL. This may be
1688 different from the DECL_NAME name used in the source file. */
1690 get_fnname_from_decl (tree decl
)
1692 rtx x
= DECL_RTL (decl
);
1693 gcc_assert (MEM_P (x
));
1695 gcc_assert (GET_CODE (x
) == SYMBOL_REF
);
1699 /* Output assembler code for the constant pool of a function and associated
1700 with defining the name of the function. DECL describes the function.
1701 NAME is the function's name. For the constant pool, we use the current
1702 constant pool data. */
1705 assemble_start_function (tree decl
, const char *fnname
)
1708 char tmp_label
[100];
1709 bool hot_label_written
= false;
1711 if (flag_reorder_blocks_and_partition
)
1713 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1714 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1715 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1716 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1717 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1718 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1719 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1720 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1725 crtl
->subsections
.hot_section_label
= NULL
;
1726 crtl
->subsections
.cold_section_label
= NULL
;
1727 crtl
->subsections
.hot_section_end_label
= NULL
;
1728 crtl
->subsections
.cold_section_end_label
= NULL
;
1731 /* The following code does not need preprocessing in the assembler. */
1735 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1736 output_constant_pool (fnname
, decl
);
1738 align
= symtab_node::get (decl
)->definition_alignment ();
1740 /* Make sure the not and cold text (code) sections are properly
1741 aligned. This is necessary here in the case where the function
1742 has both hot and cold sections, because we don't want to re-set
1743 the alignment when the section switch happens mid-function. */
1745 if (flag_reorder_blocks_and_partition
)
1747 first_function_block_is_cold
= false;
1749 switch_to_section (unlikely_text_section ());
1750 assemble_align (align
);
1751 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1753 /* When the function starts with a cold section, we need to explicitly
1754 align the hot section and write out the hot section label.
1755 But if the current function is a thunk, we do not have a CFG. */
1757 && BB_PARTITION (ENTRY_BLOCK_PTR_FOR_FN (cfun
)->next_bb
) == BB_COLD_PARTITION
)
1759 switch_to_section (text_section
);
1760 assemble_align (align
);
1761 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1762 hot_label_written
= true;
1763 first_function_block_is_cold
= true;
1765 in_cold_section_p
= first_function_block_is_cold
;
1769 /* Switch to the correct text section for the start of the function. */
1771 switch_to_section (function_section (decl
));
1772 if (flag_reorder_blocks_and_partition
1773 && !hot_label_written
)
1774 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1776 /* Tell assembler to move to target machine's alignment for functions. */
1777 align
= floor_log2 (align
/ BITS_PER_UNIT
);
1780 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1783 /* Handle a user-specified function alignment.
1784 Note that we still need to align to DECL_ALIGN, as above,
1785 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1786 if (! DECL_USER_ALIGN (decl
)
1787 && align_functions_log
> align
1788 && optimize_function_for_speed_p (cfun
))
1790 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1791 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1792 align_functions_log
, align_functions
- 1);
1794 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1798 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1799 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1802 if (!DECL_IGNORED_P (decl
))
1803 (*debug_hooks
->begin_function
) (decl
);
1805 /* Make function name accessible from other files, if appropriate. */
1807 if (TREE_PUBLIC (decl
)
1808 || (cgraph_node::get (decl
)->instrumentation_clone
1809 && cgraph_node::get (decl
)->instrumented_version
1810 && TREE_PUBLIC (cgraph_node::get (decl
)->instrumented_version
->decl
)))
1812 notice_global_symbol (decl
);
1814 globalize_decl (decl
);
1816 maybe_assemble_visibility (decl
);
1819 if (DECL_PRESERVE_P (decl
))
1820 targetm
.asm_out
.mark_decl_preserved (fnname
);
1822 /* Do any machine/system dependent processing of the function name. */
1823 #ifdef ASM_DECLARE_FUNCTION_NAME
1824 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1826 /* Standard thing is just output label for the function. */
1827 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1828 #endif /* ASM_DECLARE_FUNCTION_NAME */
1830 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1831 saw_no_split_stack
= true;
1834 /* Output assembler code associated with defining the size of the
1835 function. DECL describes the function. NAME is the function's name. */
1838 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1840 #ifdef ASM_DECLARE_FUNCTION_SIZE
1841 /* We could have switched section in the middle of the function. */
1842 if (flag_reorder_blocks_and_partition
)
1843 switch_to_section (function_section (decl
));
1844 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1846 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1848 output_constant_pool (fnname
, decl
);
1849 switch_to_section (function_section (decl
)); /* need to switch back */
1851 /* Output labels for end of hot/cold text sections (to be used by
1853 if (flag_reorder_blocks_and_partition
)
1855 section
*save_text_section
;
1857 save_text_section
= in_section
;
1858 switch_to_section (unlikely_text_section ());
1859 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1860 if (first_function_block_is_cold
)
1861 switch_to_section (text_section
);
1863 switch_to_section (function_section (decl
));
1864 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1865 switch_to_section (save_text_section
);
1869 /* Assemble code to leave SIZE bytes of zeros. */
1872 assemble_zeros (unsigned HOST_WIDE_INT size
)
1874 /* Do no output if -fsyntax-only. */
1875 if (flag_syntax_only
)
1878 #ifdef ASM_NO_SKIP_IN_TEXT
1879 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1880 so we must output 0s explicitly in the text section. */
1881 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1883 unsigned HOST_WIDE_INT i
;
1884 for (i
= 0; i
< size
; i
++)
1885 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1890 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1893 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1896 assemble_align (int align
)
1898 if (align
> BITS_PER_UNIT
)
1900 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1904 /* Assemble a string constant with the specified C string as contents. */
1907 assemble_string (const char *p
, int size
)
1912 /* If the string is very long, split it up. */
1916 int thissize
= size
- pos
;
1917 if (thissize
> maximum
)
1920 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1928 /* A noswitch_section_callback for lcomm_section. */
1931 emit_local (tree decl ATTRIBUTE_UNUSED
,
1932 const char *name ATTRIBUTE_UNUSED
,
1933 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1934 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1936 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1937 int align
= symtab_node::get (decl
)->definition_alignment ();
1938 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1941 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1942 int align
= symtab_node::get (decl
)->definition_alignment ();
1943 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, align
);
1946 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1951 /* A noswitch_section_callback for bss_noswitch_section. */
1953 #if defined ASM_OUTPUT_ALIGNED_BSS
1955 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1956 const char *name ATTRIBUTE_UNUSED
,
1957 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1958 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1960 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
,
1961 get_variable_align (decl
));
1966 /* A noswitch_section_callback for comm_section. */
1969 emit_common (tree decl ATTRIBUTE_UNUSED
,
1970 const char *name ATTRIBUTE_UNUSED
,
1971 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1972 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1974 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1975 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1976 size
, get_variable_align (decl
));
1978 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1979 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
,
1980 get_variable_align (decl
));
1983 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1988 /* A noswitch_section_callback for tls_comm_section. */
1991 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1992 const char *name ATTRIBUTE_UNUSED
,
1993 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1994 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1996 #ifdef ASM_OUTPUT_TLS_COMMON
1997 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
2000 sorry ("thread-local COMMON data not implemented");
2005 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
2006 NAME is the name of DECL's SYMBOL_REF. */
2009 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
,
2012 unsigned HOST_WIDE_INT size
, rounded
;
2014 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2017 if ((flag_sanitize
& SANITIZE_ADDRESS
) && asan_protect_global (decl
))
2018 size
+= asan_red_zone_size (size
);
2020 /* Don't allocate zero bytes of common,
2021 since that means "undefined external" in the linker. */
2025 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2026 so that each uninitialized object starts on such a boundary. */
2027 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
2028 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2029 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2031 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
2032 && (unsigned HOST_WIDE_INT
) (align
/ BITS_PER_UNIT
) > rounded
)
2033 error ("requested alignment for %q+D is greater than "
2034 "implemented alignment of %wu", decl
, rounded
);
2037 /* A subroutine of assemble_variable. Output the label and contents of
2038 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
2039 is as for assemble_variable. */
2042 assemble_variable_contents (tree decl
, const char *name
,
2043 bool dont_output_data
)
2045 /* Do any machine/system dependent processing of the object. */
2046 #ifdef ASM_DECLARE_OBJECT_NAME
2047 last_assemble_variable_decl
= decl
;
2048 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
2050 /* Standard thing is just output label for the object. */
2051 ASM_OUTPUT_LABEL (asm_out_file
, name
);
2052 #endif /* ASM_DECLARE_OBJECT_NAME */
2054 if (!dont_output_data
)
2056 /* Caller is supposed to use varpool_get_constructor when it wants
2057 to output the body. */
2058 gcc_assert (!in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
);
2059 if (DECL_INITIAL (decl
)
2060 && DECL_INITIAL (decl
) != error_mark_node
2061 && !initializer_zerop (DECL_INITIAL (decl
)))
2062 /* Output the actual data. */
2063 output_constant (DECL_INITIAL (decl
),
2064 tree_to_uhwi (DECL_SIZE_UNIT (decl
)),
2065 get_variable_align (decl
));
2067 /* Leave space for it. */
2068 assemble_zeros (tree_to_uhwi (DECL_SIZE_UNIT (decl
)));
2069 targetm
.asm_out
.decl_end ();
2073 /* Write out assembly for the variable DECL, which is not defined in
2074 the current translation unit. */
2076 assemble_undefined_decl (tree decl
)
2078 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
2079 targetm
.asm_out
.assemble_undefined_decl (asm_out_file
, name
, decl
);
2082 /* Assemble everything that is needed for a variable or function declaration.
2083 Not used for automatic variables, and not used for function definitions.
2084 Should not be called for variables of incomplete structure type.
2086 TOP_LEVEL is nonzero if this variable has file scope.
2087 AT_END is nonzero if this is the special handling, at end of compilation,
2088 to define things that have had only tentative definitions.
2089 DONT_OUTPUT_DATA if nonzero means don't actually output the
2090 initial value (that will be done by the caller). */
2093 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
2094 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
2097 rtx decl_rtl
, symbol
;
2100 bool asan_protected
= false;
2102 /* This function is supposed to handle VARIABLES. Ensure we have one. */
2103 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
2105 /* Emulated TLS had better not get this far. */
2106 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
2108 last_assemble_variable_decl
= 0;
2110 /* Normally no need to say anything here for external references,
2111 since assemble_external is called by the language-specific code
2112 when a declaration is first seen. */
2114 if (DECL_EXTERNAL (decl
))
2117 /* Do nothing for global register variables. */
2118 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
2120 TREE_ASM_WRITTEN (decl
) = 1;
2124 /* If type was incomplete when the variable was declared,
2125 see if it is complete now. */
2127 if (DECL_SIZE (decl
) == 0)
2128 layout_decl (decl
, 0);
2130 /* Still incomplete => don't allocate it; treat the tentative defn
2131 (which is what it must have been) as an `extern' reference. */
2133 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2135 error ("storage size of %q+D isn%'t known", decl
);
2136 TREE_ASM_WRITTEN (decl
) = 1;
2140 /* The first declaration of a variable that comes through this function
2141 decides whether it is global (in C, has external linkage)
2142 or local (in C, has internal linkage). So do nothing more
2143 if this function has already run. */
2145 if (TREE_ASM_WRITTEN (decl
))
2148 /* Make sure targetm.encode_section_info is invoked before we set
2150 decl_rtl
= DECL_RTL (decl
);
2152 TREE_ASM_WRITTEN (decl
) = 1;
2154 /* Do no output if -fsyntax-only. */
2155 if (flag_syntax_only
)
2158 if (! dont_output_data
2159 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
2161 error ("size of variable %q+D is too large", decl
);
2165 gcc_assert (MEM_P (decl_rtl
));
2166 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2167 symbol
= XEXP (decl_rtl
, 0);
2169 /* If this symbol belongs to the tree constant pool, output the constant
2170 if it hasn't already been written. */
2171 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
2173 tree decl
= SYMBOL_REF_DECL (symbol
);
2174 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
2175 output_constant_def_contents (symbol
);
2181 name
= XSTR (symbol
, 0);
2182 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2183 notice_global_symbol (decl
);
2185 /* Compute the alignment of this data. */
2187 align_variable (decl
, dont_output_data
);
2189 if ((flag_sanitize
& SANITIZE_ADDRESS
)
2190 && asan_protect_global (decl
))
2192 asan_protected
= true;
2193 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
2194 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
2197 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2199 align
= get_variable_align (decl
);
2201 if (TREE_PUBLIC (decl
))
2202 maybe_assemble_visibility (decl
);
2204 if (DECL_PRESERVE_P (decl
))
2205 targetm
.asm_out
.mark_decl_preserved (name
);
2207 /* First make the assembler name(s) global if appropriate. */
2208 sect
= get_variable_section (decl
, false);
2209 if (TREE_PUBLIC (decl
)
2210 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2211 globalize_decl (decl
);
2213 /* Output any data that we will need to use the address of. */
2214 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2215 output_addressed_constants (DECL_INITIAL (decl
));
2217 /* dbxout.c needs to know this. */
2218 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2219 DECL_IN_TEXT_SECTION (decl
) = 1;
2221 /* If the decl is part of an object_block, make sure that the decl
2222 has been positioned within its block, but do not write out its
2223 definition yet. output_object_blocks will do that later. */
2224 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2226 gcc_assert (!dont_output_data
);
2227 place_block_symbol (symbol
);
2229 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2230 assemble_noswitch_variable (decl
, name
, sect
, align
);
2233 /* The following bit of code ensures that vtable_map
2234 variables are not only in the comdat section, but that
2235 each variable has its own unique comdat name. If this
2236 code is removed, the variables end up in the same section
2237 with a single comdat name.
2239 FIXME: resolve_unique_section needs to deal better with
2240 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
2241 that is fixed, this if-else statement can be replaced with
2242 a single call to "switch_to_section (sect)". */
2243 if (sect
->named
.name
2244 && (strcmp (sect
->named
.name
, ".vtable_map_vars") == 0))
2246 #if defined (OBJECT_FORMAT_ELF)
2247 targetm
.asm_out
.named_section (sect
->named
.name
,
2248 sect
->named
.common
.flags
2252 #elif defined (TARGET_PECOFF)
2253 /* Neither OBJECT_FORMAT_PE, nor OBJECT_FORMAT_COFF is set here.
2254 Therefore the following check is used.
2255 In case a the target is PE or COFF a comdat group section
2256 is created, e.g. .vtable_map_vars$foo. The linker places
2257 everything in .vtable_map_vars at the end.
2259 A fix could be made in
2260 gcc/config/i386/winnt.c: i386_pe_unique_section. */
2265 if (TREE_CODE (DECL_NAME (decl
)) == IDENTIFIER_NODE
)
2266 name
= ACONCAT ((sect
->named
.name
, "$",
2267 IDENTIFIER_POINTER (DECL_NAME (decl
)), NULL
));
2269 name
= ACONCAT ((sect
->named
.name
, "$",
2270 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (DECL_NAME (decl
))),
2273 targetm
.asm_out
.named_section (name
,
2274 sect
->named
.common
.flags
2280 switch_to_section (sect
);
2284 switch_to_section (sect
);
2285 if (align
> BITS_PER_UNIT
)
2286 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
2287 assemble_variable_contents (decl
, name
, dont_output_data
);
2290 unsigned HOST_WIDE_INT
int size
2291 = tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2292 assemble_zeros (asan_red_zone_size (size
));
2298 /* Given a function declaration (FN_DECL), this function assembles the
2299 function into the .preinit_array section. */
2302 assemble_vtv_preinit_initializer (tree fn_decl
)
2305 unsigned flags
= SECTION_WRITE
;
2306 rtx symbol
= XEXP (DECL_RTL (fn_decl
), 0);
2308 flags
|= SECTION_NOTYPE
;
2309 sect
= get_section (".preinit_array", flags
, fn_decl
);
2310 switch_to_section (sect
);
2311 assemble_addr_to_section (symbol
, sect
);
2314 /* Return 1 if type TYPE contains any pointers. */
2317 contains_pointers_p (tree type
)
2319 switch (TREE_CODE (type
))
2322 case REFERENCE_TYPE
:
2323 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2324 so I'll play safe and return 1. */
2330 case QUAL_UNION_TYPE
:
2333 /* For a type that has fields, see if the fields have pointers. */
2334 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2335 if (TREE_CODE (fields
) == FIELD_DECL
2336 && contains_pointers_p (TREE_TYPE (fields
)))
2342 /* An array type contains pointers if its element type does. */
2343 return contains_pointers_p (TREE_TYPE (type
));
2350 /* We delay assemble_external processing until
2351 the compilation unit is finalized. This is the best we can do for
2352 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2353 it all the way to final. See PR 17982 for further discussion. */
2354 static GTY(()) tree pending_assemble_externals
;
2356 #ifdef ASM_OUTPUT_EXTERNAL
2357 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2358 As a result, assemble_external can be called after the list of externals
2359 is processed and the pointer set destroyed. */
2360 static bool pending_assemble_externals_processed
;
2362 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2363 TREE_LIST in assemble_external. */
2364 static hash_set
<tree
> *pending_assemble_externals_set
;
2366 /* True if DECL is a function decl for which no out-of-line copy exists.
2367 It is assumed that DECL's assembler name has been set. */
2370 incorporeal_function_p (tree decl
)
2372 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2376 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2377 && (DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
2378 || DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA_WITH_ALIGN
))
2381 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2382 /* Atomic or sync builtins which have survived this far will be
2383 resolved externally and therefore are not incorporeal. */
2384 if (strncmp (name
, "__builtin_", 10) == 0)
2390 /* Actually do the tests to determine if this is necessary, and invoke
2391 ASM_OUTPUT_EXTERNAL. */
2393 assemble_external_real (tree decl
)
2395 rtx rtl
= DECL_RTL (decl
);
2397 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2398 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2399 && !incorporeal_function_p (decl
))
2401 /* Some systems do require some output. */
2402 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2403 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2409 process_pending_assemble_externals (void)
2411 #ifdef ASM_OUTPUT_EXTERNAL
2413 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2414 assemble_external_real (TREE_VALUE (list
));
2416 pending_assemble_externals
= 0;
2417 pending_assemble_externals_processed
= true;
2418 delete pending_assemble_externals_set
;
2422 /* This TREE_LIST contains any weak symbol declarations waiting
2424 static GTY(()) tree weak_decls
;
2426 /* Output something to declare an external symbol to the assembler,
2427 and qualifiers such as weakness. (Most assemblers don't need
2428 extern declaration, so we normally output nothing.) Do nothing if
2429 DECL is not external. */
2432 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2434 /* Make sure that the ASM_OUT_FILE is open.
2435 If it's not, we should not be calling this function. */
2436 gcc_assert (asm_out_file
);
2438 /* In a perfect world, the following condition would be true.
2439 Sadly, the Java and Go front ends emit assembly *from the front end*,
2440 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2442 /* This function should only be called if we are expanding, or have
2444 Ideally, only final.c would be calling this function, but it is
2445 not clear whether that would break things somehow. See PR 17982
2446 for further discussion. */
2447 gcc_assert (state
== EXPANSION
2448 || state
== FINISHED
);
2451 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2454 /* We want to output annotation for weak and external symbols at
2455 very last to check if they are references or not. */
2457 if (TARGET_SUPPORTS_WEAK
2459 /* TREE_STATIC is a weird and abused creature which is not
2460 generally the right test for whether an entity has been
2461 locally emitted, inlined or otherwise not-really-extern, but
2462 for declarations that can be weak, it happens to be
2464 && !TREE_STATIC (decl
)
2465 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2466 && value_member (decl
, weak_decls
) == NULL_TREE
)
2467 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2469 #ifdef ASM_OUTPUT_EXTERNAL
2470 if (pending_assemble_externals_processed
)
2472 assemble_external_real (decl
);
2476 if (! pending_assemble_externals_set
->add (decl
))
2477 pending_assemble_externals
= tree_cons (NULL
, decl
,
2478 pending_assemble_externals
);
2482 /* Similar, for calling a library function FUN. */
2485 assemble_external_libcall (rtx fun
)
2487 /* Declare library function name external when first used, if nec. */
2488 if (! SYMBOL_REF_USED (fun
))
2490 SYMBOL_REF_USED (fun
) = 1;
2491 targetm
.asm_out
.external_libcall (fun
);
2495 /* Assemble a label named NAME. */
2498 assemble_label (FILE *file
, const char *name
)
2500 ASM_OUTPUT_LABEL (file
, name
);
2503 /* Set the symbol_referenced flag for ID. */
2505 mark_referenced (tree id
)
2507 TREE_SYMBOL_REFERENCED (id
) = 1;
2510 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2512 mark_decl_referenced (tree decl
)
2514 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2516 /* Extern inline functions don't become needed when referenced.
2517 If we know a method will be emitted in other TU and no new
2518 functions can be marked reachable, just use the external
2520 struct cgraph_node
*node
= cgraph_node::get_create (decl
);
2521 if (!DECL_EXTERNAL (decl
)
2522 && !node
->definition
)
2523 node
->mark_force_output ();
2525 else if (TREE_CODE (decl
) == VAR_DECL
)
2527 varpool_node
*node
= varpool_node::get_create (decl
);
2528 /* C++ frontend use mark_decl_references to force COMDAT variables
2529 to be output that might appear dead otherwise. */
2530 node
->force_output
= true;
2532 /* else do nothing - we can get various sorts of CST nodes here,
2533 which do not need to be marked. */
2537 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2538 starts with a *, the rest of NAME is output verbatim. Otherwise
2539 NAME is transformed in a target-specific way (usually by the
2540 addition of an underscore). */
2543 assemble_name_raw (FILE *file
, const char *name
)
2546 fputs (&name
[1], file
);
2548 ASM_OUTPUT_LABELREF (file
, name
);
2551 /* Like assemble_name_raw, but should be used when NAME might refer to
2552 an entity that is also represented as a tree (like a function or
2553 variable). If NAME does refer to such an entity, that entity will
2554 be marked as referenced. */
2557 assemble_name (FILE *file
, const char *name
)
2559 const char *real_name
;
2562 real_name
= targetm
.strip_name_encoding (name
);
2564 id
= maybe_get_identifier (real_name
);
2569 mark_referenced (id
);
2570 ultimate_transparent_alias_target (&id
);
2572 name
= IDENTIFIER_POINTER (id
);
2573 gcc_assert (! TREE_CHAIN (id
));
2576 assemble_name_raw (file
, name
);
2579 /* Allocate SIZE bytes writable static space with a gensym name
2580 and return an RTX to refer to its address. */
2583 assemble_static_space (unsigned HOST_WIDE_INT size
)
2586 const char *namestring
;
2589 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2591 namestring
= ggc_strdup (name
);
2593 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2594 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2596 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2597 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2600 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2601 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2604 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2605 so that each uninitialized object starts on such a boundary. */
2606 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2607 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2608 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2609 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2610 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2611 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2618 /* Assemble the static constant template for function entry trampolines.
2619 This is done at most once per compilation.
2620 Returns an RTX for the address of the template. */
2622 static GTY(()) rtx initial_trampoline
;
2625 assemble_trampoline_template (void)
2632 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2634 if (initial_trampoline
)
2635 return initial_trampoline
;
2637 /* By default, put trampoline templates in read-only data section. */
2639 #ifdef TRAMPOLINE_SECTION
2640 switch_to_section (TRAMPOLINE_SECTION
);
2642 switch_to_section (readonly_data_section
);
2645 /* Write the assembler code to define one. */
2646 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2648 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2650 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2651 targetm
.asm_out
.trampoline_template (asm_out_file
);
2653 /* Record the rtl to refer to it. */
2654 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2655 name
= ggc_strdup (label
);
2656 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2657 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2659 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2660 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2661 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2663 return initial_trampoline
;
2666 /* A and B are either alignments or offsets. Return the minimum alignment
2667 that may be assumed after adding the two together. */
2669 static inline unsigned
2670 min_align (unsigned int a
, unsigned int b
)
2672 return (a
| b
) & -(a
| b
);
2675 /* Return the assembler directive for creating a given kind of integer
2676 object. SIZE is the number of bytes in the object and ALIGNED_P
2677 indicates whether it is known to be aligned. Return NULL if the
2678 assembly dialect has no such directive.
2680 The returned string should be printed at the start of a new line and
2681 be followed immediately by the object's initial value. */
2684 integer_asm_op (int size
, int aligned_p
)
2686 struct asm_int_op
*ops
;
2689 ops
= &targetm
.asm_out
.aligned_op
;
2691 ops
= &targetm
.asm_out
.unaligned_op
;
2696 return targetm
.asm_out
.byte_op
;
2710 /* Use directive OP to assemble an integer object X. Print OP at the
2711 start of the line, followed immediately by the value of X. */
2714 assemble_integer_with_op (const char *op
, rtx x
)
2716 fputs (op
, asm_out_file
);
2717 output_addr_const (asm_out_file
, x
);
2718 fputc ('\n', asm_out_file
);
2721 /* The default implementation of the asm_out.integer target hook. */
2724 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2725 unsigned int size ATTRIBUTE_UNUSED
,
2726 int aligned_p ATTRIBUTE_UNUSED
)
2728 const char *op
= integer_asm_op (size
, aligned_p
);
2729 /* Avoid GAS bugs for large values. Specifically negative values whose
2730 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2731 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE_UNITS
)
2733 return op
&& (assemble_integer_with_op (op
, x
), true);
2736 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2737 the alignment of the integer in bits. Return 1 if we were able to output
2738 the constant, otherwise 0. We must be able to output the constant,
2739 if FORCE is nonzero. */
2742 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2746 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2748 /* See if the target hook can handle this kind of object. */
2749 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2752 /* If the object is a multi-byte one, try splitting it up. Split
2753 it into words it if is multi-word, otherwise split it into bytes. */
2756 machine_mode omode
, imode
;
2757 unsigned int subalign
;
2758 unsigned int subsize
, i
;
2759 enum mode_class mclass
;
2761 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2762 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2763 if (GET_CODE (x
) == CONST_FIXED
)
2764 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2768 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2769 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2771 for (i
= 0; i
< size
; i
+= subsize
)
2773 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2774 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2780 /* If we've printed some of it, but not all of it, there's no going
2785 gcc_assert (!force
);
2791 assemble_real (REAL_VALUE_TYPE d
, machine_mode mode
, unsigned int align
)
2793 long data
[4] = {0, 0, 0, 0};
2795 int bitsize
, nelts
, nunits
, units_per
;
2797 /* This is hairy. We have a quantity of known size. real_to_target
2798 will put it into an array of *host* longs, 32 bits per element
2799 (even if long is more than 32 bits). We need to determine the
2800 number of array elements that are occupied (nelts) and the number
2801 of *target* min-addressable units that will be occupied in the
2802 object file (nunits). We cannot assume that 32 divides the
2803 mode's bitsize (size * BITS_PER_UNIT) evenly.
2805 size * BITS_PER_UNIT is used here to make sure that padding bits
2806 (which might appear at either end of the value; real_to_target
2807 will include the padding bits in its output array) are included. */
2809 nunits
= GET_MODE_SIZE (mode
);
2810 bitsize
= nunits
* BITS_PER_UNIT
;
2811 nelts
= CEIL (bitsize
, 32);
2812 units_per
= 32 / BITS_PER_UNIT
;
2814 real_to_target (data
, &d
, mode
);
2816 /* Put out the first word with the specified alignment. */
2817 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2818 nunits
-= units_per
;
2820 /* Subsequent words need only 32-bit alignment. */
2821 align
= min_align (align
, 32);
2823 for (i
= 1; i
< nelts
; i
++)
2825 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2826 nunits
-= units_per
;
2830 /* Given an expression EXP with a constant value,
2831 reduce it to the sum of an assembler symbol and an integer.
2832 Store them both in the structure *VALUE.
2833 EXP must be reducible. */
2837 HOST_WIDE_INT offset
;
2841 decode_addr_const (tree exp
, struct addr_const
*value
)
2843 tree target
= TREE_OPERAND (exp
, 0);
2849 if (TREE_CODE (target
) == COMPONENT_REF
2850 && tree_fits_shwi_p (byte_position (TREE_OPERAND (target
, 1))))
2852 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2853 target
= TREE_OPERAND (target
, 0);
2855 else if (TREE_CODE (target
) == ARRAY_REF
2856 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2858 offset
+= (tree_to_uhwi (TYPE_SIZE_UNIT (TREE_TYPE (target
)))
2859 * tree_to_shwi (TREE_OPERAND (target
, 1)));
2860 target
= TREE_OPERAND (target
, 0);
2862 else if (TREE_CODE (target
) == MEM_REF
2863 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2865 offset
+= mem_ref_offset (target
).to_short_addr ();
2866 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2868 else if (TREE_CODE (target
) == INDIRECT_REF
2869 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2870 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2872 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2877 switch (TREE_CODE (target
))
2881 x
= DECL_RTL (target
);
2885 x
= gen_rtx_MEM (FUNCTION_MODE
,
2886 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2895 x
= output_constant_def (target
, 1);
2902 gcc_assert (MEM_P (x
));
2906 value
->offset
= offset
;
2909 static GTY(()) hash_table
<tree_descriptor_hasher
> *const_desc_htab
;
2911 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2913 /* Constant pool accessor function. */
2915 hash_table
<tree_descriptor_hasher
> *
2916 constant_pool_htab (void)
2918 return const_desc_htab
;
2921 /* Compute a hash code for a constant expression. */
2924 tree_descriptor_hasher::hash (constant_descriptor_tree
*ptr
)
2930 const_hash_1 (const tree exp
)
2935 enum tree_code code
= TREE_CODE (exp
);
2937 /* Either set P and LEN to the address and len of something to hash and
2938 exit the switch or return a value. */
2943 p
= (char *) &TREE_INT_CST_ELT (exp
, 0);
2944 len
= TREE_INT_CST_NUNITS (exp
) * sizeof (HOST_WIDE_INT
);
2948 return real_hash (TREE_REAL_CST_PTR (exp
));
2951 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2954 p
= TREE_STRING_POINTER (exp
);
2955 len
= TREE_STRING_LENGTH (exp
);
2959 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2960 + const_hash_1 (TREE_IMAGPART (exp
)));
2966 hi
= 7 + VECTOR_CST_NELTS (exp
);
2968 for (i
= 0; i
< VECTOR_CST_NELTS (exp
); ++i
)
2969 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ELT (exp
, i
));
2976 unsigned HOST_WIDE_INT idx
;
2979 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2981 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2983 hi
= hi
* 603 + const_hash_1 (value
);
2991 struct addr_const value
;
2993 decode_addr_const (exp
, &value
);
2994 switch (GET_CODE (value
.base
))
2997 /* Don't hash the address of the SYMBOL_REF;
2998 only use the offset and the symbol name. */
3000 p
= XSTR (value
.base
, 0);
3001 for (i
= 0; p
[i
] != 0; i
++)
3002 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3007 + CODE_LABEL_NUMBER (LABEL_REF_LABEL (value
.base
)) * 13);
3017 case POINTER_PLUS_EXPR
:
3019 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
3020 + const_hash_1 (TREE_OPERAND (exp
, 1)));
3023 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
3026 /* A language specific constant. Just hash the code. */
3030 /* Compute hashing function. */
3032 for (i
= 0; i
< len
; i
++)
3033 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3038 /* Wrapper of compare_constant, for the htab interface. */
3040 tree_descriptor_hasher::equal (constant_descriptor_tree
*c1
,
3041 constant_descriptor_tree
*c2
)
3043 if (c1
->hash
!= c2
->hash
)
3045 return compare_constant (c1
->value
, c2
->value
);
3048 /* Compare t1 and t2, and return 1 only if they are known to result in
3049 the same bit pattern on output. */
3052 compare_constant (const tree t1
, const tree t2
)
3054 enum tree_code typecode
;
3056 if (t1
== NULL_TREE
)
3057 return t2
== NULL_TREE
;
3058 if (t2
== NULL_TREE
)
3061 if (TREE_CODE (t1
) != TREE_CODE (t2
))
3064 switch (TREE_CODE (t1
))
3067 /* Integer constants are the same only if the same width of type. */
3068 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3070 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3072 return tree_int_cst_equal (t1
, t2
);
3075 /* Real constants are the same only if the same width of type. */
3076 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3079 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
3082 /* Fixed constants are the same only if the same width of type. */
3083 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3086 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
3089 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3092 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
3093 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
3094 TREE_STRING_LENGTH (t1
)));
3097 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
3098 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
3104 if (VECTOR_CST_NELTS (t1
) != VECTOR_CST_NELTS (t2
))
3107 for (i
= 0; i
< VECTOR_CST_NELTS (t1
); ++i
)
3108 if (!compare_constant (VECTOR_CST_ELT (t1
, i
),
3109 VECTOR_CST_ELT (t2
, i
)))
3117 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
3118 unsigned HOST_WIDE_INT idx
;
3120 typecode
= TREE_CODE (TREE_TYPE (t1
));
3121 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
3124 if (typecode
== ARRAY_TYPE
)
3126 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
3127 /* For arrays, check that the sizes all match. */
3128 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
3130 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
3135 /* For record and union constructors, require exact type
3137 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
3141 v1
= CONSTRUCTOR_ELTS (t1
);
3142 v2
= CONSTRUCTOR_ELTS (t2
);
3143 if (vec_safe_length (v1
) != vec_safe_length (v2
))
3146 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
3148 constructor_elt
*c1
= &(*v1
)[idx
];
3149 constructor_elt
*c2
= &(*v2
)[idx
];
3151 /* Check that each value is the same... */
3152 if (!compare_constant (c1
->value
, c2
->value
))
3154 /* ... and that they apply to the same fields! */
3155 if (typecode
== ARRAY_TYPE
)
3157 if (!compare_constant (c1
->index
, c2
->index
))
3162 if (c1
->index
!= c2
->index
)
3173 struct addr_const value1
, value2
;
3177 decode_addr_const (t1
, &value1
);
3178 decode_addr_const (t2
, &value2
);
3180 if (value1
.offset
!= value2
.offset
)
3183 code
= GET_CODE (value1
.base
);
3184 if (code
!= GET_CODE (value2
.base
))
3190 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3194 ret
= (CODE_LABEL_NUMBER (LABEL_REF_LABEL (value1
.base
))
3195 == CODE_LABEL_NUMBER (LABEL_REF_LABEL (value2
.base
)));
3205 case POINTER_PLUS_EXPR
:
3208 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3209 && compare_constant (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3212 case VIEW_CONVERT_EXPR
:
3213 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3222 /* Return the section into which constant EXP should be placed. */
3225 get_constant_section (tree exp
, unsigned int align
)
3227 return targetm
.asm_out
.select_section (exp
,
3228 compute_reloc_for_constant (exp
),
3232 /* Return the size of constant EXP in bytes. */
3234 static HOST_WIDE_INT
3235 get_constant_size (tree exp
)
3239 size
= int_size_in_bytes (TREE_TYPE (exp
));
3240 if (TREE_CODE (exp
) == STRING_CST
)
3241 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3245 /* Subroutine of output_constant_def:
3246 No constant equal to EXP is known to have been output.
3247 Make a constant descriptor to enter EXP in the hash table.
3248 Assign the label number and construct RTL to refer to the
3249 constant's location in memory.
3250 Caller is responsible for updating the hash table. */
3252 static struct constant_descriptor_tree
*
3253 build_constant_desc (tree exp
)
3255 struct constant_descriptor_tree
*desc
;
3261 desc
= ggc_alloc
<constant_descriptor_tree
> ();
3264 /* Create a string containing the label name, in LABEL. */
3265 labelno
= const_labelno
++;
3266 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3268 /* Construct the VAR_DECL associated with the constant. */
3269 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3271 DECL_ARTIFICIAL (decl
) = 1;
3272 DECL_IGNORED_P (decl
) = 1;
3273 TREE_READONLY (decl
) = 1;
3274 TREE_STATIC (decl
) = 1;
3275 TREE_ADDRESSABLE (decl
) = 1;
3276 /* We don't set the RTL yet as this would cause varpool to assume that the
3277 variable is referenced. Moreover, it would just be dropped in LTO mode.
3278 Instead we set the flag that will be recognized in make_decl_rtl. */
3279 DECL_IN_CONSTANT_POOL (decl
) = 1;
3280 DECL_INITIAL (decl
) = desc
->value
;
3281 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3282 architectures so use DATA_ALIGNMENT as well, except for strings. */
3283 if (TREE_CODE (exp
) == STRING_CST
)
3285 #ifdef CONSTANT_ALIGNMENT
3286 DECL_ALIGN (decl
) = CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
));
3290 align_variable (decl
, 0);
3292 /* Now construct the SYMBOL_REF and the MEM. */
3293 if (use_object_blocks_p ())
3295 int align
= (TREE_CODE (decl
) == CONST_DECL
3296 || (TREE_CODE (decl
) == VAR_DECL
3297 && DECL_IN_CONSTANT_POOL (decl
))
3299 : symtab_node::get (decl
)->definition_alignment ());
3300 section
*sect
= get_constant_section (exp
, align
);
3301 symbol
= create_block_symbol (ggc_strdup (label
),
3302 get_block_for_section (sect
), -1);
3305 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3306 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3307 SET_SYMBOL_REF_DECL (symbol
, decl
);
3308 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3310 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3311 set_mem_attributes (rtl
, exp
, 1);
3312 set_mem_alias_set (rtl
, 0);
3314 /* We cannot share RTX'es in pool entries.
3315 Mark this piece of RTL as required for unsharing. */
3316 RTX_FLAG (rtl
, used
) = 1;
3318 /* Set flags or add text to the name to record information, such as
3319 that it is a local symbol. If the name is changed, the macro
3320 ASM_OUTPUT_LABELREF will have to know how to strip this
3321 information. This call might invalidate our local variable
3322 SYMBOL; we can't use it afterward. */
3323 targetm
.encode_section_info (exp
, rtl
, true);
3330 /* Return an rtx representing a reference to constant data in memory
3331 for the constant expression EXP.
3333 If assembler code for such a constant has already been output,
3334 return an rtx to refer to it.
3335 Otherwise, output such a constant in memory
3336 and generate an rtx for it.
3338 If DEFER is nonzero, this constant can be deferred and output only
3339 if referenced in the function after all optimizations.
3341 `const_desc_table' records which constants already have label strings. */
3344 output_constant_def (tree exp
, int defer
)
3346 struct constant_descriptor_tree
*desc
;
3347 struct constant_descriptor_tree key
;
3349 /* Look up EXP in the table of constant descriptors. If we didn't find
3350 it, create a new one. */
3352 key
.hash
= const_hash_1 (exp
);
3353 constant_descriptor_tree
**loc
3354 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3359 desc
= build_constant_desc (exp
);
3360 desc
->hash
= key
.hash
;
3364 maybe_output_constant_def_contents (desc
, defer
);
3368 /* Subroutine of output_constant_def: Decide whether or not we need to
3369 output the constant DESC now, and if so, do it. */
3371 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3374 rtx symbol
= XEXP (desc
->rtl
, 0);
3375 tree exp
= desc
->value
;
3377 if (flag_syntax_only
)
3380 if (TREE_ASM_WRITTEN (exp
))
3381 /* Already output; don't do it again. */
3384 /* We can always defer constants as long as the context allows
3388 /* Increment n_deferred_constants if it exists. It needs to be at
3389 least as large as the number of constants actually referred to
3390 by the function. If it's too small we'll stop looking too early
3391 and fail to emit constants; if it's too large we'll only look
3392 through the entire function when we could have stopped earlier. */
3394 n_deferred_constants
++;
3398 output_constant_def_contents (symbol
);
3401 /* Subroutine of output_constant_def_contents. Output the definition
3402 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3403 constant's alignment in bits. */
3406 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3410 size
= get_constant_size (exp
);
3412 /* Do any machine/system dependent processing of the constant. */
3413 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3415 /* Output the value of EXP. */
3416 output_constant (exp
, size
, align
);
3418 targetm
.asm_out
.decl_end ();
3421 /* We must output the constant data referred to by SYMBOL; do so. */
3424 output_constant_def_contents (rtx symbol
)
3426 tree decl
= SYMBOL_REF_DECL (symbol
);
3427 tree exp
= DECL_INITIAL (decl
);
3428 bool asan_protected
= false;
3430 /* Make sure any other constants whose addresses appear in EXP
3431 are assigned label numbers. */
3432 output_addressed_constants (exp
);
3434 /* We are no longer deferring this constant. */
3435 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3437 if ((flag_sanitize
& SANITIZE_ADDRESS
)
3438 && TREE_CODE (exp
) == STRING_CST
3439 && asan_protect_global (exp
))
3441 asan_protected
= true;
3442 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
3443 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
3446 /* If the constant is part of an object block, make sure that the
3447 decl has been positioned within its block, but do not write out
3448 its definition yet. output_object_blocks will do that later. */
3449 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3450 place_block_symbol (symbol
);
3453 int align
= (TREE_CODE (decl
) == CONST_DECL
3454 || (TREE_CODE (decl
) == VAR_DECL
3455 && DECL_IN_CONSTANT_POOL (decl
))
3457 : symtab_node::get (decl
)->definition_alignment ());
3458 switch_to_section (get_constant_section (exp
, align
));
3459 if (align
> BITS_PER_UNIT
)
3460 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3461 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3464 HOST_WIDE_INT size
= get_constant_size (exp
);
3465 assemble_zeros (asan_red_zone_size (size
));
3470 /* Look up EXP in the table of constant descriptors. Return the rtl
3471 if it has been emitted, else null. */
3474 lookup_constant_def (tree exp
)
3476 struct constant_descriptor_tree key
;
3479 key
.hash
= const_hash_1 (exp
);
3480 constant_descriptor_tree
*desc
3481 = const_desc_htab
->find_with_hash (&key
, key
.hash
);
3483 return (desc
? desc
->rtl
: NULL_RTX
);
3486 /* Return a tree representing a reference to constant data in memory
3487 for the constant expression EXP.
3489 This is the counterpart of output_constant_def at the Tree level. */
3492 tree_output_constant_def (tree exp
)
3494 struct constant_descriptor_tree
*desc
, key
;
3497 /* Look up EXP in the table of constant descriptors. If we didn't find
3498 it, create a new one. */
3500 key
.hash
= const_hash_1 (exp
);
3501 constant_descriptor_tree
**loc
3502 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3507 desc
= build_constant_desc (exp
);
3508 desc
->hash
= key
.hash
;
3512 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3513 varpool_node::finalize_decl (decl
);
3517 struct GTY((chain_next ("%h.next"), for_user
)) constant_descriptor_rtx
{
3518 struct constant_descriptor_rtx
*next
;
3522 HOST_WIDE_INT offset
;
3530 struct const_rtx_desc_hasher
: ggc_hasher
<constant_descriptor_rtx
*>
3532 static hashval_t
hash (constant_descriptor_rtx
*);
3533 static bool equal (constant_descriptor_rtx
*, constant_descriptor_rtx
*);
3536 /* Used in the hash tables to avoid outputting the same constant
3537 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3538 are output once per function, not once per file. */
3539 /* ??? Only a few targets need per-function constant pools. Most
3540 can use one per-file pool. Should add a targetm bit to tell the
3543 struct GTY(()) rtx_constant_pool
{
3544 /* Pointers to first and last constant in pool, as ordered by offset. */
3545 struct constant_descriptor_rtx
*first
;
3546 struct constant_descriptor_rtx
*last
;
3548 /* Hash facility for making memory-constants from constant rtl-expressions.
3549 It is used on RISC machines where immediate integer arguments and
3550 constant addresses are restricted so that such constants must be stored
3552 hash_table
<const_rtx_desc_hasher
> *const_rtx_htab
;
3554 /* Current offset in constant pool (does not include any
3555 machine-specific header). */
3556 HOST_WIDE_INT offset
;
3559 /* Hash and compare functions for const_rtx_htab. */
3562 const_rtx_desc_hasher::hash (constant_descriptor_rtx
*desc
)
3568 const_rtx_desc_hasher::equal (constant_descriptor_rtx
*x
,
3569 constant_descriptor_rtx
*y
)
3571 if (x
->mode
!= y
->mode
)
3573 return rtx_equal_p (x
->constant
, y
->constant
);
3576 /* Hash one component of a constant. */
3579 const_rtx_hash_1 (const_rtx x
)
3581 unsigned HOST_WIDE_INT hwi
;
3587 code
= GET_CODE (x
);
3588 mode
= GET_MODE (x
);
3589 h
= (hashval_t
) code
* 1048573 + mode
;
3598 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3599 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3601 h
^= (hashval_t
) hwi
;
3602 for (i
= 1; i
< n
; ++i
)
3605 h
^= (hashval_t
) hwi
;
3610 case CONST_WIDE_INT
:
3611 hwi
= GET_MODE_PRECISION (mode
);
3613 for (i
= 0; i
< CONST_WIDE_INT_NUNITS (x
); i
++)
3614 hwi
^= CONST_WIDE_INT_ELT (x
, i
);
3619 if (TARGET_SUPPORTS_WIDE_INT
== 0 && mode
== VOIDmode
)
3621 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3625 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3629 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3633 h
^= htab_hash_string (XSTR (x
, 0));
3637 h
= h
* 251 + CODE_LABEL_NUMBER (LABEL_REF_LABEL (x
));
3641 case UNSPEC_VOLATILE
:
3642 h
= h
* 251 + XINT (x
, 1);
3652 /* Compute a hash value for X, which should be a constant. */
3655 const_rtx_hash (rtx x
)
3658 subrtx_iterator::array_type array
;
3659 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
3660 h
= h
* 509 + const_rtx_hash_1 (*iter
);
3665 /* Create and return a new rtx constant pool. */
3667 static struct rtx_constant_pool
*
3668 create_constant_pool (void)
3670 struct rtx_constant_pool
*pool
;
3672 pool
= ggc_alloc
<rtx_constant_pool
> ();
3673 pool
->const_rtx_htab
= hash_table
<const_rtx_desc_hasher
>::create_ggc (31);
3680 /* Initialize constant pool hashing for a new function. */
3683 init_varasm_status (void)
3685 crtl
->varasm
.pool
= create_constant_pool ();
3686 crtl
->varasm
.deferred_constants
= 0;
3689 /* Given a MINUS expression, simplify it if both sides
3690 include the same symbol. */
3693 simplify_subtraction (rtx x
)
3695 rtx r
= simplify_rtx (x
);
3699 /* Given a constant rtx X, make (or find) a memory constant for its value
3700 and return a MEM rtx to refer to it in memory. */
3703 force_const_mem (machine_mode mode
, rtx x
)
3705 struct constant_descriptor_rtx
*desc
, tmp
;
3706 struct rtx_constant_pool
*pool
;
3711 constant_descriptor_rtx
**slot
;
3713 /* If we're not allowed to drop X into the constant pool, don't. */
3714 if (targetm
.cannot_force_const_mem (mode
, x
))
3717 /* Record that this function has used a constant pool entry. */
3718 crtl
->uses_const_pool
= 1;
3720 /* Decide which pool to use. */
3721 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3722 ? shared_constant_pool
3723 : crtl
->varasm
.pool
);
3725 /* Lookup the value in the hashtable. */
3728 hash
= const_rtx_hash (x
);
3729 slot
= pool
->const_rtx_htab
->find_slot_with_hash (&tmp
, hash
, INSERT
);
3732 /* If the constant was already present, return its memory. */
3734 return copy_rtx (desc
->mem
);
3736 /* Otherwise, create a new descriptor. */
3737 desc
= ggc_alloc
<constant_descriptor_rtx
> ();
3740 /* Align the location counter as required by EXP's data type. */
3741 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3742 #ifdef CONSTANT_ALIGNMENT
3744 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3745 if (type
!= NULL_TREE
)
3746 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3750 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3751 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3754 desc
->constant
= copy_rtx (tmp
.constant
);
3755 desc
->offset
= pool
->offset
;
3758 desc
->align
= align
;
3759 desc
->labelno
= const_labelno
;
3762 pool
->offset
+= GET_MODE_SIZE (mode
);
3764 pool
->last
->next
= desc
;
3766 pool
->first
= pool
->last
= desc
;
3769 /* Create a string containing the label name, in LABEL. */
3770 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3773 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3774 the constants pool. */
3775 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3777 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3778 symbol
= create_block_symbol (ggc_strdup (label
),
3779 get_block_for_section (sect
), -1);
3782 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3784 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3785 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3786 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3788 /* Construct the MEM. */
3789 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3790 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3791 set_mem_align (def
, align
);
3793 /* If we're dropping a label to the constant pool, make sure we
3795 if (GET_CODE (x
) == LABEL_REF
)
3796 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3798 return copy_rtx (def
);
3801 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3804 get_pool_constant (const_rtx addr
)
3806 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3809 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3810 and whether it has been output or not. */
3813 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3815 struct constant_descriptor_rtx
*desc
;
3817 desc
= SYMBOL_REF_CONSTANT (addr
);
3818 *pmarked
= (desc
->mark
!= 0);
3819 return desc
->constant
;
3822 /* Similar, return the mode. */
3825 get_pool_mode (const_rtx addr
)
3827 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3830 /* Return the size of the constant pool. */
3833 get_pool_size (void)
3835 return crtl
->varasm
.pool
->offset
;
3838 /* Worker function for output_constant_pool_1. Emit assembly for X
3839 in MODE with known alignment ALIGN. */
3842 output_constant_pool_2 (machine_mode mode
, rtx x
, unsigned int align
)
3844 switch (GET_MODE_CLASS (mode
))
3847 case MODE_DECIMAL_FLOAT
:
3851 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3852 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3853 assemble_real (r
, mode
, align
);
3858 case MODE_PARTIAL_INT
:
3863 case MODE_POINTER_BOUNDS
:
3864 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3867 case MODE_VECTOR_FLOAT
:
3868 case MODE_VECTOR_INT
:
3869 case MODE_VECTOR_FRACT
:
3870 case MODE_VECTOR_UFRACT
:
3871 case MODE_VECTOR_ACCUM
:
3872 case MODE_VECTOR_UACCUM
:
3875 machine_mode submode
= GET_MODE_INNER (mode
);
3876 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3878 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3879 units
= CONST_VECTOR_NUNITS (x
);
3881 for (i
= 0; i
< units
; i
++)
3883 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3884 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3894 /* Worker function for output_constant_pool. Emit constant DESC,
3895 giving it ALIGN bits of alignment. */
3898 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3905 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3906 whose CODE_LABEL has been deleted. This can occur if a jump table
3907 is eliminated by optimization. If so, write a constant of zero
3908 instead. Note that this can also happen by turning the
3909 CODE_LABEL into a NOTE. */
3910 /* ??? This seems completely and utterly wrong. Certainly it's
3911 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3912 functioning even with rtx_insn::deleted and friends. */
3915 switch (GET_CODE (tmp
))
3918 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3919 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3921 tmp
= XEXP (XEXP (tmp
, 0), 0);
3925 tmp
= LABEL_REF_LABEL (tmp
);
3926 gcc_assert (!as_a
<rtx_insn
*> (tmp
)->deleted ());
3927 gcc_assert (!NOTE_P (tmp
)
3928 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3935 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3936 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3937 align
, desc
->labelno
, done
);
3940 assemble_align (align
);
3942 /* Output the label. */
3943 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3945 /* Output the data. */
3946 output_constant_pool_2 (desc
->mode
, x
, align
);
3948 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3949 sections have proper size. */
3950 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3952 && (in_section
->common
.flags
& SECTION_MERGE
))
3953 assemble_align (align
);
3955 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3961 /* Mark all constants that are referenced by SYMBOL_REFs in X.
3962 Emit referenced deferred strings. */
3965 mark_constants_in_pattern (rtx insn
)
3967 subrtx_iterator::array_type array
;
3968 FOR_EACH_SUBRTX (iter
, array
, PATTERN (insn
), ALL
)
3970 const_rtx x
= *iter
;
3971 if (GET_CODE (x
) == SYMBOL_REF
)
3973 if (CONSTANT_POOL_ADDRESS_P (x
))
3975 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3976 if (desc
->mark
== 0)
3979 iter
.substitute (desc
->constant
);
3982 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3984 tree decl
= SYMBOL_REF_DECL (x
);
3985 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
3987 n_deferred_constants
--;
3988 output_constant_def_contents (CONST_CAST_RTX (x
));
3995 /* Look through appropriate parts of INSN, marking all entries in the
3996 constant pool which are actually being used. Entries that are only
3997 referenced by other constants are also marked as used. Emit
3998 deferred strings that are used. */
4001 mark_constants (rtx_insn
*insn
)
4006 /* Insns may appear inside a SEQUENCE. Only check the patterns of
4007 insns, not any notes that may be attached. We don't want to mark
4008 a constant just because it happens to appear in a REG_EQUIV note. */
4009 if (rtx_sequence
*seq
= dyn_cast
<rtx_sequence
*> (PATTERN (insn
)))
4011 int i
, n
= seq
->len ();
4012 for (i
= 0; i
< n
; ++i
)
4014 rtx subinsn
= seq
->element (i
);
4015 if (INSN_P (subinsn
))
4016 mark_constants_in_pattern (subinsn
);
4020 mark_constants_in_pattern (insn
);
4023 /* Look through the instructions for this function, and mark all the
4024 entries in POOL which are actually being used. Emit deferred constants
4025 which have indeed been used. */
4028 mark_constant_pool (void)
4032 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
4035 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
4036 mark_constants (insn
);
4039 /* Write all the constants in POOL. */
4042 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
4044 struct constant_descriptor_rtx
*desc
;
4046 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
4049 /* If the constant is part of an object_block, make sure that
4050 the constant has been positioned within its block, but do not
4051 write out its definition yet. output_object_blocks will do
4053 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
4054 && SYMBOL_REF_BLOCK (desc
->sym
))
4055 place_block_symbol (desc
->sym
);
4058 switch_to_section (targetm
.asm_out
.select_rtx_section
4059 (desc
->mode
, desc
->constant
, desc
->align
));
4060 output_constant_pool_1 (desc
, desc
->align
);
4065 /* Mark all constants that are used in the current function, then write
4066 out the function's private constant pool. */
4069 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
4070 tree fndecl ATTRIBUTE_UNUSED
)
4072 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
4074 /* It is possible for gcc to call force_const_mem and then to later
4075 discard the instructions which refer to the constant. In such a
4076 case we do not need to output the constant. */
4077 mark_constant_pool ();
4079 #ifdef ASM_OUTPUT_POOL_PROLOGUE
4080 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4083 output_constant_pool_contents (pool
);
4085 #ifdef ASM_OUTPUT_POOL_EPILOGUE
4086 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4090 /* Write the contents of the shared constant pool. */
4093 output_shared_constant_pool (void)
4095 output_constant_pool_contents (shared_constant_pool
);
4098 /* Determine what kind of relocations EXP may need. */
4101 compute_reloc_for_constant (tree exp
)
4103 int reloc
= 0, reloc2
;
4106 switch (TREE_CODE (exp
))
4110 /* Go inside any operations that get_inner_reference can handle and see
4111 if what's inside is a constant: no need to do anything here for
4112 addresses of variables or functions. */
4113 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4114 tem
= TREE_OPERAND (tem
, 0))
4117 if (TREE_CODE (tem
) == MEM_REF
4118 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
4120 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
4124 if (!targetm
.binds_local_p (tem
))
4131 case POINTER_PLUS_EXPR
:
4132 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4133 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4137 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4138 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4139 /* The difference of two local labels is computable at link time. */
4140 if (reloc
== 1 && reloc2
== 1)
4147 case VIEW_CONVERT_EXPR
:
4148 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4153 unsigned HOST_WIDE_INT idx
;
4154 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4156 reloc
|= compute_reloc_for_constant (tem
);
4166 /* Find all the constants whose addresses are referenced inside of EXP,
4167 and make sure assembler code with a label has been output for each one.
4168 Indicate whether an ADDR_EXPR has been encountered. */
4171 output_addressed_constants (tree exp
)
4175 switch (TREE_CODE (exp
))
4179 /* Go inside any operations that get_inner_reference can handle and see
4180 if what's inside is a constant: no need to do anything here for
4181 addresses of variables or functions. */
4182 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4183 tem
= TREE_OPERAND (tem
, 0))
4186 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4187 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4188 tem
= DECL_INITIAL (tem
);
4190 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4191 output_constant_def (tem
, 0);
4193 if (TREE_CODE (tem
) == MEM_REF
)
4194 output_addressed_constants (TREE_OPERAND (tem
, 0));
4198 case POINTER_PLUS_EXPR
:
4200 output_addressed_constants (TREE_OPERAND (exp
, 1));
4204 case VIEW_CONVERT_EXPR
:
4205 output_addressed_constants (TREE_OPERAND (exp
, 0));
4210 unsigned HOST_WIDE_INT idx
;
4211 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4213 output_addressed_constants (tem
);
4222 /* Whether a constructor CTOR is a valid static constant initializer if all
4223 its elements are. This used to be internal to initializer_constant_valid_p
4224 and has been exposed to let other functions like categorize_ctor_elements
4225 evaluate the property while walking a constructor for other purposes. */
4228 constructor_static_from_elts_p (const_tree ctor
)
4230 return (TREE_CONSTANT (ctor
)
4231 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4232 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4233 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4236 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4239 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4240 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4241 which are valid when ENDTYPE is an integer of any size; in
4242 particular, this does not accept a pointer minus a constant. This
4243 returns null_pointer_node if the VALUE is an absolute constant
4244 which can be used to initialize a static variable. Otherwise it
4248 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4252 if (!INTEGRAL_TYPE_P (endtype
))
4255 op0
= TREE_OPERAND (value
, 0);
4256 op1
= TREE_OPERAND (value
, 1);
4258 /* Like STRIP_NOPS except allow the operand mode to widen. This
4259 works around a feature of fold that simplifies (int)(p1 - p2) to
4260 ((int)p1 - (int)p2) under the theory that the narrower operation
4263 while (CONVERT_EXPR_P (op0
)
4264 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4266 tree inner
= TREE_OPERAND (op0
, 0);
4267 if (inner
== error_mark_node
4268 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4269 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4270 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4275 while (CONVERT_EXPR_P (op1
)
4276 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4278 tree inner
= TREE_OPERAND (op1
, 0);
4279 if (inner
== error_mark_node
4280 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4281 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4282 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4287 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4291 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4292 cache
? cache
+ 2 : NULL
);
4293 /* Both initializers must be known. */
4297 && (op0
== null_pointer_node
4298 || TREE_CODE (value
) == MINUS_EXPR
))
4299 return null_pointer_node
;
4301 /* Support differences between labels. */
4302 if (TREE_CODE (op0
) == LABEL_DECL
4303 && TREE_CODE (op1
) == LABEL_DECL
)
4304 return null_pointer_node
;
4306 if (TREE_CODE (op0
) == STRING_CST
4307 && TREE_CODE (op1
) == STRING_CST
4308 && operand_equal_p (op0
, op1
, 1))
4309 return null_pointer_node
;
4315 /* Helper function of initializer_constant_valid_p.
4316 Return nonzero if VALUE is a valid constant-valued expression
4317 for use in initializing a static variable; one that can be an
4318 element of a "constant" initializer.
4320 Return null_pointer_node if the value is absolute;
4321 if it is relocatable, return the variable that determines the relocation.
4322 We assume that VALUE has been folded as much as possible;
4323 therefore, we do not need to check for such things as
4324 arithmetic-combinations of integers.
4326 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4329 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4333 switch (TREE_CODE (value
))
4336 if (constructor_static_from_elts_p (value
))
4338 unsigned HOST_WIDE_INT idx
;
4340 bool absolute
= true;
4342 if (cache
&& cache
[0] == value
)
4344 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4347 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4354 cache
[1] = NULL_TREE
;
4358 if (reloc
!= null_pointer_node
)
4361 /* For a non-absolute relocation, there is no single
4362 variable that can be "the variable that determines the
4367 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4369 return absolute
? null_pointer_node
: error_mark_node
;
4372 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4380 return null_pointer_node
;
4385 tree op0
= staticp (TREE_OPERAND (value
, 0));
4388 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4389 to be a constant, this is old-skool offsetof-like nonsense. */
4390 if (TREE_CODE (op0
) == INDIRECT_REF
4391 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4392 return null_pointer_node
;
4393 /* Taking the address of a nested function involves a trampoline,
4394 unless we don't need or want one. */
4395 if (TREE_CODE (op0
) == FUNCTION_DECL
4396 && DECL_STATIC_CHAIN (op0
)
4397 && !TREE_NO_TRAMPOLINE (value
))
4399 /* "&{...}" requires a temporary to hold the constructed
4401 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4407 case NON_LVALUE_EXPR
:
4408 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4411 case VIEW_CONVERT_EXPR
:
4413 tree src
= TREE_OPERAND (value
, 0);
4414 tree src_type
= TREE_TYPE (src
);
4415 tree dest_type
= TREE_TYPE (value
);
4417 /* Allow view-conversions from aggregate to non-aggregate type only
4418 if the bit pattern is fully preserved afterwards; otherwise, the
4419 RTL expander won't be able to apply a subsequent transformation
4420 to the underlying constructor. */
4421 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4423 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4424 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4429 /* Allow all other kinds of view-conversion. */
4430 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4435 tree src
= TREE_OPERAND (value
, 0);
4436 tree src_type
= TREE_TYPE (src
);
4437 tree dest_type
= TREE_TYPE (value
);
4439 /* Allow conversions between pointer types, floating-point
4440 types, and offset types. */
4441 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4442 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4443 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4444 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4445 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4447 /* Allow length-preserving conversions between integer types. */
4448 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4449 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4450 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4452 /* Allow conversions between other integer types only if
4454 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4456 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4457 if (inner
== null_pointer_node
)
4458 return null_pointer_node
;
4462 /* Allow (int) &foo provided int is as wide as a pointer. */
4463 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4464 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4465 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4467 /* Likewise conversions from int to pointers, but also allow
4468 conversions from 0. */
4469 if ((POINTER_TYPE_P (dest_type
)
4470 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4471 && INTEGRAL_TYPE_P (src_type
))
4473 if (TREE_CODE (src
) == INTEGER_CST
4474 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4475 return null_pointer_node
;
4476 if (integer_zerop (src
))
4477 return null_pointer_node
;
4478 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4479 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4482 /* Allow conversions to struct or union types if the value
4484 if (TREE_CODE (dest_type
) == RECORD_TYPE
4485 || TREE_CODE (dest_type
) == UNION_TYPE
)
4486 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4490 case POINTER_PLUS_EXPR
:
4492 /* Any valid floating-point constants will have been folded by now;
4493 with -frounding-math we hit this with addition of two constants. */
4494 if (TREE_CODE (endtype
) == REAL_TYPE
)
4496 if (cache
&& cache
[0] == value
)
4498 if (! INTEGRAL_TYPE_P (endtype
)
4499 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4501 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4503 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4506 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4507 endtype
, ncache
+ 2);
4508 /* If either term is absolute, use the other term's relocation. */
4509 if (valid0
== null_pointer_node
)
4511 else if (valid1
== null_pointer_node
)
4513 /* Support narrowing pointer differences. */
4515 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4519 /* Support narrowing pointer differences. */
4520 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4529 if (TREE_CODE (endtype
) == REAL_TYPE
)
4531 if (cache
&& cache
[0] == value
)
4533 if (! INTEGRAL_TYPE_P (endtype
)
4534 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4536 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4538 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4541 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4542 endtype
, ncache
+ 2);
4543 /* Win if second argument is absolute. */
4544 if (valid1
== null_pointer_node
)
4546 /* Win if both arguments have the same relocation.
4547 Then the value is absolute. */
4548 else if (valid0
== valid1
&& valid0
!= 0)
4549 ret
= null_pointer_node
;
4550 /* Since GCC guarantees that string constants are unique in the
4551 generated code, a subtraction between two copies of the same
4552 constant string is absolute. */
4553 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4554 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4555 && operand_equal_p (valid0
, valid1
, 1))
4556 ret
= null_pointer_node
;
4557 /* Support narrowing differences. */
4559 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4563 /* Support narrowing differences. */
4564 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4579 /* Return nonzero if VALUE is a valid constant-valued expression
4580 for use in initializing a static variable; one that can be an
4581 element of a "constant" initializer.
4583 Return null_pointer_node if the value is absolute;
4584 if it is relocatable, return the variable that determines the relocation.
4585 We assume that VALUE has been folded as much as possible;
4586 therefore, we do not need to check for such things as
4587 arithmetic-combinations of integers. */
4589 initializer_constant_valid_p (tree value
, tree endtype
)
4591 return initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4594 /* Return true if VALUE is a valid constant-valued expression
4595 for use in initializing a static bit-field; one that can be
4596 an element of a "constant" initializer. */
4599 initializer_constant_valid_for_bitfield_p (tree value
)
4601 /* For bitfields we support integer constants or possibly nested aggregates
4603 switch (TREE_CODE (value
))
4607 unsigned HOST_WIDE_INT idx
;
4610 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4611 if (!initializer_constant_valid_for_bitfield_p (elt
))
4620 case VIEW_CONVERT_EXPR
:
4621 case NON_LVALUE_EXPR
:
4623 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4632 /* output_constructor outer state of relevance in recursive calls, typically
4633 for nested aggregate bitfields. */
4636 unsigned int bit_offset
; /* current position in ... */
4637 int byte
; /* ... the outer byte buffer. */
4640 static unsigned HOST_WIDE_INT
4641 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int,
4644 /* Output assembler code for constant EXP, with no label.
4645 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4646 Assumes output_addressed_constants has been done on EXP already.
4648 Generate at least SIZE bytes of assembler data, padding at the end
4649 with zeros if necessary. SIZE must always be specified. The returned
4650 value is the actual number of bytes of assembler data generated, which
4651 may be bigger than SIZE if the object contains a variable length field.
4653 SIZE is important for structure constructors,
4654 since trailing members may have been omitted from the constructor.
4655 It is also important for initialization of arrays from string constants
4656 since the full length of the string constant might not be wanted.
4657 It is also needed for initialization of unions, where the initializer's
4658 type is just one member, and that may not be as long as the union.
4660 There a case in which we would fail to output exactly SIZE bytes:
4661 for a structure constructor that wants to produce more than SIZE bytes.
4662 But such constructors will never be generated for any possible input.
4664 ALIGN is the alignment of the data in bits. */
4666 static unsigned HOST_WIDE_INT
4667 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4669 enum tree_code code
;
4670 unsigned HOST_WIDE_INT thissize
;
4672 if (size
== 0 || flag_syntax_only
)
4675 /* See if we're trying to initialize a pointer in a non-default mode
4676 to the address of some declaration somewhere. If the target says
4677 the mode is valid for pointers, assume the target has a way of
4679 if (TREE_CODE (exp
) == NOP_EXPR
4680 && POINTER_TYPE_P (TREE_TYPE (exp
))
4681 && targetm
.addr_space
.valid_pointer_mode
4682 (TYPE_MODE (TREE_TYPE (exp
)),
4683 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4685 tree saved_type
= TREE_TYPE (exp
);
4687 /* Peel off any intermediate conversions-to-pointer for valid
4689 while (TREE_CODE (exp
) == NOP_EXPR
4690 && POINTER_TYPE_P (TREE_TYPE (exp
))
4691 && targetm
.addr_space
.valid_pointer_mode
4692 (TYPE_MODE (TREE_TYPE (exp
)),
4693 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4694 exp
= TREE_OPERAND (exp
, 0);
4696 /* If what we're left with is the address of something, we can
4697 convert the address to the final type and output it that
4699 if (TREE_CODE (exp
) == ADDR_EXPR
)
4700 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4701 /* Likewise for constant ints. */
4702 else if (TREE_CODE (exp
) == INTEGER_CST
)
4703 exp
= wide_int_to_tree (saved_type
, exp
);
4707 /* Eliminate any conversions since we'll be outputting the underlying
4709 while (CONVERT_EXPR_P (exp
)
4710 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4711 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4713 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4714 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4716 /* Make sure eliminating the conversion is really a no-op, except with
4717 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4718 union types to allow for Ada unchecked unions. */
4719 if (type_size
> op_size
4720 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4721 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4722 /* Keep the conversion. */
4725 exp
= TREE_OPERAND (exp
, 0);
4728 code
= TREE_CODE (TREE_TYPE (exp
));
4729 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4731 /* Allow a constructor with no elements for any data type.
4732 This means to fill the space with zeros. */
4733 if (TREE_CODE (exp
) == CONSTRUCTOR
4734 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4736 assemble_zeros (size
);
4740 if (TREE_CODE (exp
) == FDESC_EXPR
)
4742 #ifdef ASM_OUTPUT_FDESC
4743 HOST_WIDE_INT part
= tree_to_shwi (TREE_OPERAND (exp
, 1));
4744 tree decl
= TREE_OPERAND (exp
, 0);
4745 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4752 /* Now output the underlying data. If we've handling the padding, return.
4753 Otherwise, break and ensure SIZE is the size written. */
4760 case REFERENCE_TYPE
:
4762 case FIXED_POINT_TYPE
:
4763 case POINTER_BOUNDS_TYPE
:
4765 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4766 EXPAND_INITIALIZER
),
4767 MIN (size
, thissize
), align
, 0))
4768 error ("initializer for integer/fixed-point value is too complicated");
4772 if (TREE_CODE (exp
) != REAL_CST
)
4773 error ("initializer for floating value is not a floating constant");
4775 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4779 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4780 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4781 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4786 switch (TREE_CODE (exp
))
4789 return output_constructor (exp
, size
, align
, NULL
);
4792 = MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
), size
);
4793 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4797 machine_mode inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4798 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4799 int elt_size
= GET_MODE_SIZE (inner
);
4800 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
);
4801 thissize
= elt_size
;
4802 for (unsigned int i
= 1; i
< VECTOR_CST_NELTS (exp
); i
++)
4804 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
);
4805 thissize
+= elt_size
;
4816 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4817 return output_constructor (exp
, size
, align
, NULL
);
4826 if (size
> thissize
)
4827 assemble_zeros (size
- thissize
);
4833 /* Subroutine of output_constructor, used for computing the size of
4834 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4835 type with an unspecified upper bound. */
4837 static unsigned HOST_WIDE_INT
4838 array_size_for_constructor (tree val
)
4841 unsigned HOST_WIDE_INT cnt
;
4842 tree index
, value
, tmp
;
4845 /* This code used to attempt to handle string constants that are not
4846 arrays of single-bytes, but nothing else does, so there's no point in
4848 if (TREE_CODE (val
) == STRING_CST
)
4849 return TREE_STRING_LENGTH (val
);
4851 max_index
= NULL_TREE
;
4852 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4854 if (TREE_CODE (index
) == RANGE_EXPR
)
4855 index
= TREE_OPERAND (index
, 1);
4856 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4860 if (max_index
== NULL_TREE
)
4863 /* Compute the total number of array elements. */
4864 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4865 i
= wi::to_offset (max_index
) - wi::to_offset (tmp
) + 1;
4867 /* Multiply by the array element unit size to find number of bytes. */
4868 i
*= wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4870 gcc_assert (wi::fits_uhwi_p (i
));
4871 return i
.to_uhwi ();
4874 /* Other datastructures + helpers for output_constructor. */
4876 /* output_constructor local state to support interaction with helpers. */
4880 /* Received arguments. */
4881 tree exp
; /* Constructor expression. */
4882 tree type
; /* Type of constructor expression. */
4883 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4884 unsigned int align
; /* Known initial alignment. */
4885 tree min_index
; /* Lower bound if specified for an array. */
4887 /* Output processing state. */
4888 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4889 int byte
; /* Part of a bitfield byte yet to be output. */
4890 int last_relative_index
; /* Implicit or explicit index of the last
4891 array element output within a bitfield. */
4892 bool byte_buffer_in_use
; /* Whether BYTE is in use. */
4894 /* Current element. */
4895 tree field
; /* Current field decl in a record. */
4896 tree val
; /* Current element value. */
4897 tree index
; /* Current element index. */
4901 /* Helper for output_constructor. From the current LOCAL state, output a
4902 RANGE_EXPR element. */
4905 output_constructor_array_range (oc_local_state
*local
)
4907 unsigned HOST_WIDE_INT fieldsize
4908 = int_size_in_bytes (TREE_TYPE (local
->type
));
4910 HOST_WIDE_INT lo_index
4911 = tree_to_shwi (TREE_OPERAND (local
->index
, 0));
4912 HOST_WIDE_INT hi_index
4913 = tree_to_shwi (TREE_OPERAND (local
->index
, 1));
4914 HOST_WIDE_INT index
;
4917 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4919 for (index
= lo_index
; index
<= hi_index
; index
++)
4921 /* Output the element's initial value. */
4922 if (local
->val
== NULL_TREE
)
4923 assemble_zeros (fieldsize
);
4925 fieldsize
= output_constant (local
->val
, fieldsize
, align2
);
4927 /* Count its size. */
4928 local
->total_bytes
+= fieldsize
;
4932 /* Helper for output_constructor. From the current LOCAL state, output a
4933 field element that is not true bitfield or part of an outer one. */
4936 output_constructor_regular_field (oc_local_state
*local
)
4938 /* Field size and position. Since this structure is static, we know the
4939 positions are constant. */
4940 unsigned HOST_WIDE_INT fieldsize
;
4941 HOST_WIDE_INT fieldpos
;
4943 unsigned int align2
;
4945 if (local
->index
!= NULL_TREE
)
4947 /* Perform the index calculation in modulo arithmetic but
4948 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4949 but we are using an unsigned sizetype. */
4950 unsigned prec
= TYPE_PRECISION (sizetype
);
4951 offset_int idx
= wi::sext (wi::to_offset (local
->index
)
4952 - wi::to_offset (local
->min_index
), prec
);
4953 fieldpos
= (idx
* wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
))))
4956 else if (local
->field
!= NULL_TREE
)
4957 fieldpos
= int_byte_position (local
->field
);
4961 /* Output any buffered-up bit-fields preceding this element. */
4962 if (local
->byte_buffer_in_use
)
4964 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4965 local
->total_bytes
++;
4966 local
->byte_buffer_in_use
= false;
4969 /* Advance to offset of this element.
4970 Note no alignment needed in an array, since that is guaranteed
4971 if each element has the proper size. */
4972 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4973 && fieldpos
> local
->total_bytes
)
4975 assemble_zeros (fieldpos
- local
->total_bytes
);
4976 local
->total_bytes
= fieldpos
;
4979 /* Find the alignment of this element. */
4980 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
4982 /* Determine size this element should occupy. */
4987 /* If this is an array with an unspecified upper bound,
4988 the initializer determines the size. */
4989 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4990 but we cannot do this until the deprecated support for
4991 initializing zero-length array members is removed. */
4992 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
4993 && TYPE_DOMAIN (TREE_TYPE (local
->field
))
4994 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
))))
4996 fieldsize
= array_size_for_constructor (local
->val
);
4997 /* Given a non-empty initialization, this field had
4999 gcc_assert (!fieldsize
|| !DECL_CHAIN (local
->field
));
5002 fieldsize
= tree_to_uhwi (DECL_SIZE_UNIT (local
->field
));
5005 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
5007 /* Output the element's initial value. */
5008 if (local
->val
== NULL_TREE
)
5009 assemble_zeros (fieldsize
);
5011 fieldsize
= output_constant (local
->val
, fieldsize
, align2
);
5013 /* Count its size. */
5014 local
->total_bytes
+= fieldsize
;
5017 /* Helper for output_constructor. From the LOCAL state, output an element
5018 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
5019 from the start of a possibly ongoing outer byte buffer. */
5022 output_constructor_bitfield (oc_local_state
*local
, unsigned int bit_offset
)
5024 /* Bit size of this element. */
5025 HOST_WIDE_INT ebitsize
5027 ? tree_to_uhwi (DECL_SIZE (local
->field
))
5028 : tree_to_uhwi (TYPE_SIZE (TREE_TYPE (local
->type
))));
5030 /* Relative index of this element if this is an array component. */
5031 HOST_WIDE_INT relative_index
5034 ? (tree_to_shwi (local
->index
)
5035 - tree_to_shwi (local
->min_index
))
5036 : local
->last_relative_index
+ 1)
5039 /* Bit position of this element from the start of the containing
5041 HOST_WIDE_INT constructor_relative_ebitpos
5043 ? int_bit_position (local
->field
)
5044 : ebitsize
* relative_index
);
5046 /* Bit position of this element from the start of a possibly ongoing
5047 outer byte buffer. */
5048 HOST_WIDE_INT byte_relative_ebitpos
5049 = bit_offset
+ constructor_relative_ebitpos
;
5051 /* From the start of a possibly ongoing outer byte buffer, offsets to
5052 the first bit of this element and to the first bit past the end of
5054 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
5055 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
5057 local
->last_relative_index
= relative_index
;
5059 if (local
->val
== NULL_TREE
)
5060 local
->val
= integer_zero_node
;
5062 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
5063 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
5064 local
->val
= TREE_OPERAND (local
->val
, 0);
5066 if (TREE_CODE (local
->val
) != INTEGER_CST
5067 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
5069 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
5073 /* If this field does not start in this (or next) byte, skip some bytes. */
5074 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5076 /* Output remnant of any bit field in previous bytes. */
5077 if (local
->byte_buffer_in_use
)
5079 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5080 local
->total_bytes
++;
5081 local
->byte_buffer_in_use
= false;
5084 /* If still not at proper byte, advance to there. */
5085 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5087 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
5088 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
5089 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
5093 /* Set up the buffer if necessary. */
5094 if (!local
->byte_buffer_in_use
)
5098 local
->byte_buffer_in_use
= true;
5101 /* If this is nested constructor, recurse passing the bit offset and the
5102 pending data, then retrieve the new pending data afterwards. */
5103 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
5105 oc_outer_state temp_state
;
5106 temp_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
5107 temp_state
.byte
= local
->byte
;
5109 += output_constructor (local
->val
, 0, 0, &temp_state
);
5110 local
->byte
= temp_state
.byte
;
5114 /* Otherwise, we must split the element into pieces that fall within
5115 separate bytes, and combine each byte with previous or following
5117 while (next_offset
< end_offset
)
5121 HOST_WIDE_INT value
;
5122 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
5123 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
5125 /* Advance from byte to byte within this element when necessary. */
5126 while (next_byte
!= local
->total_bytes
)
5128 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5129 local
->total_bytes
++;
5133 /* Number of bits we can process at once (all part of the same byte). */
5134 this_time
= MIN (end_offset
- next_offset
, BITS_PER_UNIT
- next_bit
);
5135 if (BYTES_BIG_ENDIAN
)
5137 /* On big-endian machine, take the most significant bits (of the
5138 bits that are significant) first and put them into bytes from
5139 the most significant end. */
5140 shift
= end_offset
- next_offset
- this_time
;
5142 /* Don't try to take a bunch of bits that cross
5143 the word boundary in the INTEGER_CST. We can
5144 only select bits from one element. */
5145 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5146 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5148 const int end
= shift
+ this_time
- 1;
5149 shift
= end
& -HOST_BITS_PER_WIDE_INT
;
5150 this_time
= end
- shift
+ 1;
5153 /* Now get the bits from the appropriate constant word. */
5154 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5155 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5157 /* Get the result. This works only when:
5158 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5159 local
->byte
|= (((value
>> shift
)
5160 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5161 << (BITS_PER_UNIT
- this_time
- next_bit
));
5165 /* On little-endian machines, take the least significant bits of
5166 the value first and pack them starting at the least significant
5167 bits of the bytes. */
5168 shift
= next_offset
- byte_relative_ebitpos
;
5170 /* Don't try to take a bunch of bits that cross
5171 the word boundary in the INTEGER_CST. We can
5172 only select bits from one element. */
5173 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5174 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5176 = HOST_BITS_PER_WIDE_INT
- (shift
& (HOST_BITS_PER_WIDE_INT
- 1));
5178 /* Now get the bits from the appropriate constant word. */
5179 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5180 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5182 /* Get the result. This works only when:
5183 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5184 local
->byte
|= (((value
>> shift
)
5185 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5189 next_offset
+= this_time
;
5190 local
->byte_buffer_in_use
= true;
5194 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5195 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5196 caller output state of relevance in recursive invocations. */
5198 static unsigned HOST_WIDE_INT
5199 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
5200 unsigned int align
, oc_outer_state
*outer
)
5202 unsigned HOST_WIDE_INT cnt
;
5203 constructor_elt
*ce
;
5205 oc_local_state local
;
5207 /* Setup our local state to communicate with helpers. */
5209 local
.type
= TREE_TYPE (exp
);
5211 local
.align
= align
;
5212 if (TREE_CODE (local
.type
) == ARRAY_TYPE
&& TYPE_DOMAIN (local
.type
))
5213 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5215 local
.min_index
= NULL_TREE
;
5217 local
.total_bytes
= 0;
5218 local
.byte_buffer_in_use
= outer
!= NULL
;
5219 local
.byte
= outer
? outer
->byte
: 0;
5220 local
.last_relative_index
= -1;
5222 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5224 /* As CE goes through the elements of the constant, FIELD goes through the
5225 structure fields if the constant is a structure. If the constant is a
5226 union, we override this by getting the field from the TREE_LIST element.
5227 But the constant could also be an array. Then FIELD is zero.
5229 There is always a maximum of one element in the chain LINK for unions
5230 (even if the initializer in a source program incorrectly contains
5233 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5234 local
.field
= TYPE_FIELDS (local
.type
);
5236 local
.field
= NULL_TREE
;
5239 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5240 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5242 local
.val
= ce
->value
;
5243 local
.index
= NULL_TREE
;
5245 /* The element in a union constructor specifies the proper field
5247 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5248 local
.field
= ce
->index
;
5250 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5251 local
.index
= ce
->index
;
5253 if (local
.field
&& flag_verbose_asm
)
5254 fprintf (asm_out_file
, "%s %s:\n",
5256 DECL_NAME (local
.field
)
5257 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5260 /* Eliminate the marker that makes a cast not be an lvalue. */
5261 if (local
.val
!= NULL_TREE
)
5262 STRIP_NOPS (local
.val
);
5264 /* Output the current element, using the appropriate helper ... */
5266 /* For an array slice not part of an outer bitfield. */
5268 && local
.index
!= NULL_TREE
5269 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5270 output_constructor_array_range (&local
);
5272 /* For a field that is neither a true bitfield nor part of an outer one,
5273 known to be at least byte aligned and multiple-of-bytes long. */
5275 && (local
.field
== NULL_TREE
5276 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5277 output_constructor_regular_field (&local
);
5279 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5280 supported for scalar fields, so we may need to convert first. */
5283 if (TREE_CODE (local
.val
) == REAL_CST
)
5285 = fold_unary (VIEW_CONVERT_EXPR
,
5286 build_nonstandard_integer_type
5287 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5289 output_constructor_bitfield (&local
, outer
? outer
->bit_offset
: 0);
5293 /* If we are not at toplevel, save the pending data for our caller.
5294 Otherwise output the pending data and padding zeros as needed. */
5296 outer
->byte
= local
.byte
;
5299 if (local
.byte_buffer_in_use
)
5301 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5302 local
.total_bytes
++;
5305 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5307 assemble_zeros (local
.size
- local
.total_bytes
);
5308 local
.total_bytes
= local
.size
;
5312 return local
.total_bytes
;
5315 /* Mark DECL as weak. */
5318 mark_weak (tree decl
)
5320 if (DECL_WEAK (decl
))
5323 struct symtab_node
*n
= symtab_node::get (decl
);
5324 if (n
&& n
->refuse_visibility_changes
)
5325 error ("%+D declared weak after being used", decl
);
5326 DECL_WEAK (decl
) = 1;
5328 if (DECL_RTL_SET_P (decl
)
5329 && MEM_P (DECL_RTL (decl
))
5330 && XEXP (DECL_RTL (decl
), 0)
5331 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5332 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5335 /* Merge weak status between NEWDECL and OLDDECL. */
5338 merge_weak (tree newdecl
, tree olddecl
)
5340 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5342 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5345 /* We put the NEWDECL on the weak_decls list at some point
5346 and OLDDECL as well. Keep just OLDDECL on the list. */
5347 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5348 if (TREE_VALUE (*pwd
) == newdecl
)
5350 *pwd
= TREE_CHAIN (*pwd
);
5357 if (DECL_WEAK (newdecl
))
5361 /* NEWDECL is weak, but OLDDECL is not. */
5363 /* If we already output the OLDDECL, we're in trouble; we can't
5364 go back and make it weak. This should never happen in
5365 unit-at-a-time compilation. */
5366 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5368 /* If we've already generated rtl referencing OLDDECL, we may
5369 have done so in a way that will not function properly with
5370 a weak symbol. Again in unit-at-a-time this should be
5372 gcc_assert (!TREE_USED (olddecl
)
5373 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5375 if (TARGET_SUPPORTS_WEAK
)
5377 /* We put the NEWDECL on the weak_decls list at some point.
5378 Replace it with the OLDDECL. */
5379 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5380 if (TREE_VALUE (wd
) == newdecl
)
5382 TREE_VALUE (wd
) = olddecl
;
5385 /* We may not find the entry on the list. If NEWDECL is a
5386 weak alias, then we will have already called
5387 globalize_decl to remove the entry; in that case, we do
5388 not need to do anything. */
5391 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5392 mark_weak (olddecl
);
5395 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5396 weak. Just update NEWDECL to indicate that it's weak too. */
5397 mark_weak (newdecl
);
5400 /* Declare DECL to be a weak symbol. */
5403 declare_weak (tree decl
)
5405 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5406 if (! TREE_PUBLIC (decl
))
5407 error ("weak declaration of %q+D must be public", decl
);
5408 else if (!TARGET_SUPPORTS_WEAK
)
5409 warning (0, "weak declaration of %q+D not supported", decl
);
5412 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5413 DECL_ATTRIBUTES (decl
)
5414 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5418 weak_finish_1 (tree decl
)
5420 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5421 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5424 if (! TREE_USED (decl
))
5427 #ifdef ASM_WEAKEN_DECL
5428 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5430 #ifdef ASM_WEAKEN_LABEL
5431 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5433 #ifdef ASM_OUTPUT_WEAK_ALIAS
5435 static bool warn_once
= 0;
5438 warning (0, "only weak aliases are supported in this configuration");
5448 /* Fiven an assembly name, find the decl it is associated with. */
5450 find_decl (tree target
)
5452 symtab_node
*node
= symtab_node::get_for_asmname (target
);
5458 /* This TREE_LIST contains weakref targets. */
5460 static GTY(()) tree weakref_targets
;
5462 /* Emit any pending weak declarations. */
5469 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5471 tree alias_decl
= TREE_PURPOSE (t
);
5472 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5474 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5475 /* Remove alias_decl from the weak list, but leave entries for
5476 the target alone. */
5478 #ifndef ASM_OUTPUT_WEAKREF
5479 else if (! TREE_SYMBOL_REFERENCED (target
))
5481 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5482 defined, otherwise we and weak_finish_1 would use
5483 different macros. */
5484 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5485 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5487 tree decl
= find_decl (target
);
5491 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5492 TREE_CODE (alias_decl
), target
,
5493 TREE_TYPE (alias_decl
));
5495 DECL_EXTERNAL (decl
) = 1;
5496 TREE_PUBLIC (decl
) = 1;
5497 DECL_ARTIFICIAL (decl
) = 1;
5498 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5499 TREE_USED (decl
) = 1;
5502 weak_finish_1 (decl
);
5511 /* Remove the alias and the target from the pending weak list
5512 so that we do not emit any .weak directives for the former,
5513 nor multiple .weak directives for the latter. */
5514 for (p
= &weak_decls
; (t2
= *p
) ; )
5516 if (TREE_VALUE (t2
) == alias_decl
5517 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5518 *p
= TREE_CHAIN (t2
);
5520 p
= &TREE_CHAIN (t2
);
5523 /* Remove other weakrefs to the same target, to speed things up. */
5524 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5526 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5527 *p
= TREE_CHAIN (t2
);
5529 p
= &TREE_CHAIN (t2
);
5534 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5536 tree decl
= TREE_VALUE (t
);
5538 weak_finish_1 (decl
);
5542 /* Emit the assembly bits to indicate that DECL is globally visible. */
5545 globalize_decl (tree decl
)
5548 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5549 if (DECL_WEAK (decl
))
5551 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5554 #ifdef ASM_WEAKEN_DECL
5555 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5557 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5560 /* Remove this function from the pending weak list so that
5561 we do not emit multiple .weak directives for it. */
5562 for (p
= &weak_decls
; (t
= *p
) ; )
5564 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5565 *p
= TREE_CHAIN (t
);
5567 p
= &TREE_CHAIN (t
);
5570 /* Remove weakrefs to the same target from the pending weakref
5571 list, for the same reason. */
5572 for (p
= &weakref_targets
; (t
= *p
) ; )
5574 if (DECL_ASSEMBLER_NAME (decl
)
5575 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5576 *p
= TREE_CHAIN (t
);
5578 p
= &TREE_CHAIN (t
);
5585 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5588 vec
<alias_pair
, va_gc
> *alias_pairs
;
5590 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5591 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5592 tree node is DECL to have the value of the tree node TARGET. */
5595 do_assemble_alias (tree decl
, tree target
)
5599 /* Emulated TLS had better not get this var. */
5600 gcc_assert (!(!targetm
.have_tls
5601 && TREE_CODE (decl
) == VAR_DECL
5602 && DECL_THREAD_LOCAL_P (decl
)));
5604 if (TREE_ASM_WRITTEN (decl
))
5607 id
= DECL_ASSEMBLER_NAME (decl
);
5608 ultimate_transparent_alias_target (&id
);
5609 ultimate_transparent_alias_target (&target
);
5611 /* We must force creation of DECL_RTL for debug info generation, even though
5612 we don't use it here. */
5613 make_decl_rtl (decl
);
5615 TREE_ASM_WRITTEN (decl
) = 1;
5616 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5617 TREE_ASM_WRITTEN (id
) = 1;
5619 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5621 if (!TREE_SYMBOL_REFERENCED (target
))
5622 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5624 #ifdef ASM_OUTPUT_WEAKREF
5625 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5626 IDENTIFIER_POINTER (id
),
5627 IDENTIFIER_POINTER (target
));
5629 if (!TARGET_SUPPORTS_WEAK
)
5631 error_at (DECL_SOURCE_LOCATION (decl
),
5632 "weakref is not supported in this configuration");
5639 #ifdef ASM_OUTPUT_DEF
5640 tree orig_decl
= decl
;
5642 if (TREE_CODE (decl
) == FUNCTION_DECL
5643 && cgraph_node::get (decl
)->instrumentation_clone
5644 && cgraph_node::get (decl
)->instrumented_version
)
5645 orig_decl
= cgraph_node::get (decl
)->instrumented_version
->decl
;
5647 /* Make name accessible from other files, if appropriate. */
5649 if (TREE_PUBLIC (decl
) || TREE_PUBLIC (orig_decl
))
5651 globalize_decl (decl
);
5652 maybe_assemble_visibility (decl
);
5654 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5656 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5657 if (targetm
.has_ifunc_p ())
5658 ASM_OUTPUT_TYPE_DIRECTIVE
5659 (asm_out_file
, IDENTIFIER_POINTER (id
),
5663 error_at (DECL_SOURCE_LOCATION (decl
),
5664 "ifunc is not supported on this target");
5667 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5668 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5670 ASM_OUTPUT_DEF (asm_out_file
,
5671 IDENTIFIER_POINTER (id
),
5672 IDENTIFIER_POINTER (target
));
5674 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5679 name
= IDENTIFIER_POINTER (id
);
5680 # ifdef ASM_WEAKEN_DECL
5681 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5683 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5685 /* Remove this function from the pending weak list so that
5686 we do not emit multiple .weak directives for it. */
5687 for (p
= &weak_decls
; (t
= *p
) ; )
5688 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
))
5689 || id
== DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5690 *p
= TREE_CHAIN (t
);
5692 p
= &TREE_CHAIN (t
);
5694 /* Remove weakrefs to the same target from the pending weakref
5695 list, for the same reason. */
5696 for (p
= &weakref_targets
; (t
= *p
) ; )
5698 if (id
== ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5699 *p
= TREE_CHAIN (t
);
5701 p
= &TREE_CHAIN (t
);
5707 /* Emit an assembler directive to make the symbol for DECL an alias to
5708 the symbol for TARGET. */
5711 assemble_alias (tree decl
, tree target
)
5715 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5717 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5719 ultimate_transparent_alias_target (&target
);
5721 if (alias
== target
)
5722 error ("weakref %q+D ultimately targets itself", decl
);
5723 if (TREE_PUBLIC (decl
))
5724 error ("weakref %q+D must have static linkage", decl
);
5728 #if !defined (ASM_OUTPUT_DEF)
5729 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5730 error_at (DECL_SOURCE_LOCATION (decl
),
5731 "alias definitions not supported in this configuration");
5732 TREE_ASM_WRITTEN (decl
) = 1;
5735 if (!DECL_WEAK (decl
))
5737 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5738 error_at (DECL_SOURCE_LOCATION (decl
),
5739 "ifunc is not supported in this configuration");
5741 error_at (DECL_SOURCE_LOCATION (decl
),
5742 "only weak aliases are supported in this configuration");
5743 TREE_ASM_WRITTEN (decl
) = 1;
5749 TREE_USED (decl
) = 1;
5751 /* Allow aliases to aliases. */
5752 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5753 cgraph_node::get_create (decl
)->alias
= true;
5755 varpool_node::get_create (decl
)->alias
= true;
5757 /* If the target has already been emitted, we don't have to queue the
5758 alias. This saves a tad of memory. */
5759 if (symtab
->global_info_ready
)
5760 target_decl
= find_decl (target
);
5763 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5764 || symtab
->state
>= EXPANSION
)
5765 do_assemble_alias (decl
, target
);
5768 alias_pair p
= {decl
, target
};
5769 vec_safe_push (alias_pairs
, p
);
5773 /* Record and output a table of translations from original function
5774 to its transaction aware clone. Note that tm_pure functions are
5775 considered to be their own clone. */
5777 struct tm_clone_hasher
: ggc_cache_hasher
<tree_map
*>
5779 static hashval_t
hash (tree_map
*m
) { return tree_map_hash (m
); }
5780 static bool equal (tree_map
*a
, tree_map
*b
) { return tree_map_eq (a
, b
); }
5782 static void handle_cache_entry (tree_map
*&e
)
5784 if (e
!= HTAB_EMPTY_ENTRY
|| e
!= HTAB_DELETED_ENTRY
)
5786 extern void gt_ggc_mx (tree_map
*&);
5787 if (ggc_marked_p (e
->base
.from
))
5790 e
= static_cast<tree_map
*> (HTAB_DELETED_ENTRY
);
5796 hash_table
<tm_clone_hasher
> *tm_clone_hash
;
5799 record_tm_clone_pair (tree o
, tree n
)
5801 struct tree_map
**slot
, *h
;
5803 if (tm_clone_hash
== NULL
)
5804 tm_clone_hash
= hash_table
<tm_clone_hasher
>::create_ggc (32);
5806 h
= ggc_alloc
<tree_map
> ();
5807 h
->hash
= htab_hash_pointer (o
);
5811 slot
= tm_clone_hash
->find_slot_with_hash (h
, h
->hash
, INSERT
);
5816 get_tm_clone_pair (tree o
)
5820 struct tree_map
*h
, in
;
5823 in
.hash
= htab_hash_pointer (o
);
5824 h
= tm_clone_hash
->find_with_hash (&in
, in
.hash
);
5831 typedef struct tm_alias_pair
5839 /* Dump the actual pairs to the .tm_clone_table section. */
5842 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5846 bool switched
= false;
5848 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5852 struct cgraph_node
*src_n
= cgraph_node::get (src
);
5853 struct cgraph_node
*dst_n
= cgraph_node::get (dst
);
5855 /* The function ipa_tm_create_version() marks the clone as needed if
5856 the original function was needed. But we also mark the clone as
5857 needed if we ever called the clone indirectly through
5858 TM_GETTMCLONE. If neither of these are true, we didn't generate
5859 a clone, and we didn't call it indirectly... no sense keeping it
5860 in the clone table. */
5861 if (!dst_n
|| !dst_n
->definition
)
5864 /* This covers the case where we have optimized the original
5865 function away, and only access the transactional clone. */
5866 if (!src_n
|| !src_n
->definition
)
5871 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5872 assemble_align (POINTER_SIZE
);
5876 assemble_integer (XEXP (DECL_RTL (src
), 0),
5877 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
5878 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5879 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
5883 /* Provide a default for the tm_clone_table section. */
5886 default_clone_table_section (void)
5888 return get_named_section (NULL
, ".tm_clone_table", 3);
5891 /* Helper comparison function for qsorting by the DECL_UID stored in
5892 alias_pair->emitted_diags. */
5895 tm_alias_pair_cmp (const void *x
, const void *y
)
5897 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5898 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5899 if (p1
->uid
< p2
->uid
)
5901 if (p1
->uid
> p2
->uid
)
5907 finish_tm_clone_pairs (void)
5909 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5911 if (tm_clone_hash
== NULL
)
5914 /* We need a determenistic order for the .tm_clone_table, otherwise
5915 we will get bootstrap comparison failures, so dump the hash table
5916 to a vector, sort it, and dump the vector. */
5918 /* Dump the hashtable to a vector. */
5920 hash_table
<tm_clone_hasher
>::iterator iter
;
5921 FOR_EACH_HASH_TABLE_ELEMENT (*tm_clone_hash
, map
, tree_map
*, iter
)
5923 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5924 tm_alias_pairs
.safe_push (p
);
5927 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5930 dump_tm_clone_pairs (tm_alias_pairs
);
5932 tm_clone_hash
->empty ();
5933 tm_clone_hash
= NULL
;
5934 tm_alias_pairs
.release ();
5938 /* Emit an assembler directive to set symbol for DECL visibility to
5939 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5942 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5943 int vis ATTRIBUTE_UNUSED
)
5945 #ifdef HAVE_GAS_HIDDEN
5946 static const char * const visibility_types
[] = {
5947 NULL
, "protected", "hidden", "internal"
5950 const char *name
, *type
;
5953 id
= DECL_ASSEMBLER_NAME (decl
);
5954 ultimate_transparent_alias_target (&id
);
5955 name
= IDENTIFIER_POINTER (id
);
5957 type
= visibility_types
[vis
];
5959 fprintf (asm_out_file
, "\t.%s\t", type
);
5960 assemble_name (asm_out_file
, name
);
5961 fprintf (asm_out_file
, "\n");
5963 if (!DECL_ARTIFICIAL (decl
))
5964 warning (OPT_Wattributes
, "visibility attribute not supported "
5965 "in this configuration; ignored");
5969 /* A helper function to call assemble_visibility when needed for a decl. */
5972 maybe_assemble_visibility (tree decl
)
5974 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5976 if (TREE_CODE (decl
) == FUNCTION_DECL
5977 && cgraph_node::get (decl
)
5978 && cgraph_node::get (decl
)->instrumentation_clone
5979 && cgraph_node::get (decl
)->instrumented_version
)
5980 vis
= DECL_VISIBILITY (cgraph_node::get (decl
)->instrumented_version
->decl
);
5982 if (vis
!= VISIBILITY_DEFAULT
)
5984 targetm
.asm_out
.assemble_visibility (decl
, vis
);
5991 /* Returns 1 if the target configuration supports defining public symbols
5992 so that one of them will be chosen at link time instead of generating a
5993 multiply-defined symbol error, whether through the use of weak symbols or
5994 a target-specific mechanism for having duplicates discarded. */
5997 supports_one_only (void)
5999 if (SUPPORTS_ONE_ONLY
)
6001 return TARGET_SUPPORTS_WEAK
;
6004 /* Set up DECL as a public symbol that can be defined in multiple
6005 translation units without generating a linker error. */
6008 make_decl_one_only (tree decl
, tree comdat_group
)
6010 struct symtab_node
*symbol
;
6011 gcc_assert (TREE_CODE (decl
) == VAR_DECL
6012 || TREE_CODE (decl
) == FUNCTION_DECL
);
6014 TREE_PUBLIC (decl
) = 1;
6016 if (TREE_CODE (decl
) == VAR_DECL
)
6017 symbol
= varpool_node::get_create (decl
);
6019 symbol
= cgraph_node::get_create (decl
);
6021 if (SUPPORTS_ONE_ONLY
)
6023 #ifdef MAKE_DECL_ONE_ONLY
6024 MAKE_DECL_ONE_ONLY (decl
);
6026 symbol
->set_comdat_group (comdat_group
);
6028 else if (TREE_CODE (decl
) == VAR_DECL
6029 && (DECL_INITIAL (decl
) == 0
6030 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6031 DECL_COMMON (decl
) = 1;
6034 gcc_assert (TARGET_SUPPORTS_WEAK
);
6035 DECL_WEAK (decl
) = 1;
6040 init_varasm_once (void)
6042 section_htab
= hash_table
<section_hasher
>::create_ggc (31);
6043 object_block_htab
= hash_table
<object_block_hasher
>::create_ggc (31);
6044 const_desc_htab
= hash_table
<tree_descriptor_hasher
>::create_ggc (1009);
6046 shared_constant_pool
= create_constant_pool ();
6048 #ifdef TEXT_SECTION_ASM_OP
6049 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
6050 TEXT_SECTION_ASM_OP
);
6053 #ifdef DATA_SECTION_ASM_OP
6054 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6055 DATA_SECTION_ASM_OP
);
6058 #ifdef SDATA_SECTION_ASM_OP
6059 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6060 SDATA_SECTION_ASM_OP
);
6063 #ifdef READONLY_DATA_SECTION_ASM_OP
6064 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
6065 READONLY_DATA_SECTION_ASM_OP
);
6068 #ifdef CTORS_SECTION_ASM_OP
6069 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
6070 CTORS_SECTION_ASM_OP
);
6073 #ifdef DTORS_SECTION_ASM_OP
6074 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
6075 DTORS_SECTION_ASM_OP
);
6078 #ifdef BSS_SECTION_ASM_OP
6079 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6080 output_section_asm_op
,
6081 BSS_SECTION_ASM_OP
);
6084 #ifdef SBSS_SECTION_ASM_OP
6085 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6086 output_section_asm_op
,
6087 SBSS_SECTION_ASM_OP
);
6090 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6091 | SECTION_COMMON
, emit_tls_common
);
6092 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6093 | SECTION_COMMON
, emit_local
);
6094 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6095 | SECTION_COMMON
, emit_common
);
6097 #if defined ASM_OUTPUT_ALIGNED_BSS
6098 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
6102 targetm
.asm_out
.init_sections ();
6104 if (readonly_data_section
== NULL
)
6105 readonly_data_section
= text_section
;
6107 #ifdef ASM_OUTPUT_EXTERNAL
6108 pending_assemble_externals_set
= new hash_set
<tree
>;
6113 decl_default_tls_model (const_tree decl
)
6115 enum tls_model kind
;
6118 is_local
= targetm
.binds_local_p (decl
);
6122 kind
= TLS_MODEL_LOCAL_EXEC
;
6124 kind
= TLS_MODEL_INITIAL_EXEC
;
6127 /* Local dynamic is inefficient when we're not combining the
6128 parts of the address. */
6129 else if (optimize
&& is_local
)
6130 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
6132 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
6133 if (kind
< flag_tls_default
)
6134 kind
= flag_tls_default
;
6139 /* Select a set of attributes for section NAME based on the properties
6140 of DECL and whether or not RELOC indicates that DECL's initializer
6141 might contain runtime relocations.
6143 We make the section read-only and executable for a function decl,
6144 read-only for a const data decl, and writable for a non-const data decl. */
6147 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6151 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6152 flags
= SECTION_CODE
;
6155 enum section_category category
6156 = categorize_decl_for_section (decl
, reloc
);
6157 if (decl_readonly_section_1 (category
))
6159 else if (category
== SECCAT_DATA_REL_RO
6160 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6161 flags
= SECTION_WRITE
| SECTION_RELRO
;
6163 flags
= SECTION_WRITE
;
6167 flags
= SECTION_WRITE
;
6168 if (strcmp (name
, ".data.rel.ro") == 0
6169 || strcmp (name
, ".data.rel.ro.local") == 0)
6170 flags
|= SECTION_RELRO
;
6173 if (decl
&& DECL_P (decl
) && DECL_COMDAT_GROUP (decl
))
6174 flags
|= SECTION_LINKONCE
;
6176 if (strcmp (name
, ".vtable_map_vars") == 0)
6177 flags
|= SECTION_LINKONCE
;
6179 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6180 flags
|= SECTION_TLS
| SECTION_WRITE
;
6182 if (strcmp (name
, ".bss") == 0
6183 || strncmp (name
, ".bss.", 5) == 0
6184 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6185 || strcmp (name
, ".persistent.bss") == 0
6186 || strcmp (name
, ".sbss") == 0
6187 || strncmp (name
, ".sbss.", 6) == 0
6188 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6189 flags
|= SECTION_BSS
;
6191 if (strcmp (name
, ".tdata") == 0
6192 || strncmp (name
, ".tdata.", 7) == 0
6193 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6194 flags
|= SECTION_TLS
;
6196 if (strcmp (name
, ".tbss") == 0
6197 || strncmp (name
, ".tbss.", 6) == 0
6198 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6199 flags
|= SECTION_TLS
| SECTION_BSS
;
6201 /* These three sections have special ELF types. They are neither
6202 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6203 want to print a section type (@progbits or @nobits). If someone
6204 is silly enough to emit code or TLS variables to one of these
6205 sections, then don't handle them specially. */
6206 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6207 && (strcmp (name
, ".init_array") == 0
6208 || strcmp (name
, ".fini_array") == 0
6209 || strcmp (name
, ".preinit_array") == 0))
6210 flags
|= SECTION_NOTYPE
;
6215 /* Return true if the target supports some form of global BSS,
6216 either through bss_noswitch_section, or by selecting a BSS
6217 section in TARGET_ASM_SELECT_SECTION. */
6220 have_global_bss_p (void)
6222 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6225 /* Output assembly to switch to section NAME with attribute FLAGS.
6226 Four variants for common object file formats. */
6229 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6230 unsigned int flags ATTRIBUTE_UNUSED
,
6231 tree decl ATTRIBUTE_UNUSED
)
6233 /* Some object formats don't support named sections at all. The
6234 front-end should already have flagged this as an error. */
6238 #ifndef TLS_SECTION_ASM_FLAG
6239 #define TLS_SECTION_ASM_FLAG 'T'
6243 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6244 tree decl ATTRIBUTE_UNUSED
)
6246 char flagchars
[10], *f
= flagchars
;
6248 /* If we have already declared this section, we can use an
6249 abbreviated form to switch back to it -- unless this section is
6250 part of a COMDAT groups, in which case GAS requires the full
6251 declaration every time. */
6252 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6253 && (flags
& SECTION_DECLARED
))
6255 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6259 if (!(flags
& SECTION_DEBUG
))
6261 #if defined (HAVE_GAS_SECTION_EXCLUDE) && HAVE_GAS_SECTION_EXCLUDE == 1
6262 if (flags
& SECTION_EXCLUDE
)
6265 if (flags
& SECTION_WRITE
)
6267 if (flags
& SECTION_CODE
)
6269 if (flags
& SECTION_SMALL
)
6271 if (flags
& SECTION_MERGE
)
6273 if (flags
& SECTION_STRINGS
)
6275 if (flags
& SECTION_TLS
)
6276 *f
++ = TLS_SECTION_ASM_FLAG
;
6277 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6281 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6283 if (!(flags
& SECTION_NOTYPE
))
6288 if (flags
& SECTION_BSS
)
6294 /* On platforms that use "@" as the assembly comment character,
6296 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6298 fprintf (asm_out_file
, format
, type
);
6300 if (flags
& SECTION_ENTSIZE
)
6301 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6302 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6304 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6305 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6307 fprintf (asm_out_file
, ",%s,comdat",
6308 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6312 putc ('\n', asm_out_file
);
6316 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6317 tree decl ATTRIBUTE_UNUSED
)
6319 char flagchars
[8], *f
= flagchars
;
6321 if (flags
& SECTION_WRITE
)
6323 if (flags
& SECTION_CODE
)
6327 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6331 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6334 default_coff_asm_named_section (name
, flags
, decl
);
6336 if (flags
& SECTION_LINKONCE
)
6338 /* Functions may have been compiled at various levels of
6339 optimization so we can't use `same_size' here.
6340 Instead, have the linker pick one. */
6341 fprintf (asm_out_file
, "\t.linkonce %s\n",
6342 (flags
& SECTION_CODE
? "discard" : "same_size"));
6346 /* The lame default section selector. */
6349 default_select_section (tree decl
, int reloc
,
6350 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6354 if (decl_readonly_section (decl
, reloc
))
6355 return readonly_data_section
;
6357 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6359 if (! ((flag_pic
&& reloc
)
6360 || !TREE_READONLY (decl
)
6361 || TREE_SIDE_EFFECTS (decl
)
6362 || !TREE_CONSTANT (decl
)))
6363 return readonly_data_section
;
6365 else if (TREE_CODE (decl
) == STRING_CST
)
6366 return readonly_data_section
;
6367 else if (! (flag_pic
&& reloc
))
6368 return readonly_data_section
;
6370 return data_section
;
6373 enum section_category
6374 categorize_decl_for_section (const_tree decl
, int reloc
)
6376 enum section_category ret
;
6378 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6380 else if (TREE_CODE (decl
) == STRING_CST
)
6382 if ((flag_sanitize
& SANITIZE_ADDRESS
)
6383 && asan_protect_global (CONST_CAST_TREE (decl
)))
6384 /* or !flag_merge_constants */
6385 return SECCAT_RODATA
;
6387 return SECCAT_RODATA_MERGE_STR
;
6389 else if (TREE_CODE (decl
) == VAR_DECL
)
6391 if (bss_initializer_p (decl
))
6393 else if (! TREE_READONLY (decl
)
6394 || TREE_SIDE_EFFECTS (decl
)
6395 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6397 /* Here the reloc_rw_mask is not testing whether the section should
6398 be read-only or not, but whether the dynamic link will have to
6399 do something. If so, we wish to segregate the data in order to
6400 minimize cache misses inside the dynamic linker. */
6401 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6402 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6406 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6407 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6408 else if (reloc
|| flag_merge_constants
< 2
6409 || ((flag_sanitize
& SANITIZE_ADDRESS
)
6410 && asan_protect_global (CONST_CAST_TREE (decl
))))
6411 /* C and C++ don't allow different variables to share the same
6412 location. -fmerge-all-constants allows even that (at the
6413 expense of not conforming). */
6414 ret
= SECCAT_RODATA
;
6415 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6416 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6418 ret
= SECCAT_RODATA_MERGE_CONST
;
6420 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6422 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6423 || TREE_SIDE_EFFECTS (decl
)
6424 || ! TREE_CONSTANT (decl
))
6427 ret
= SECCAT_RODATA
;
6430 ret
= SECCAT_RODATA
;
6432 /* There are no read-only thread-local sections. */
6433 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6435 /* Note that this would be *just* SECCAT_BSS, except that there's
6436 no concept of a read-only thread-local-data section. */
6437 if (ret
== SECCAT_BSS
6438 || (flag_zero_initialized_in_bss
6439 && initializer_zerop (DECL_INITIAL (decl
))))
6445 /* If the target uses small data sections, select it. */
6446 else if (targetm
.in_small_data_p (decl
))
6448 if (ret
== SECCAT_BSS
)
6450 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6451 ret
= SECCAT_SRODATA
;
6460 decl_readonly_section_1 (enum section_category category
)
6465 case SECCAT_RODATA_MERGE_STR
:
6466 case SECCAT_RODATA_MERGE_STR_INIT
:
6467 case SECCAT_RODATA_MERGE_CONST
:
6468 case SECCAT_SRODATA
:
6476 decl_readonly_section (const_tree decl
, int reloc
)
6478 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6481 /* Select a section based on the above categorization. */
6484 default_elf_select_section (tree decl
, int reloc
,
6485 unsigned HOST_WIDE_INT align
)
6488 switch (categorize_decl_for_section (decl
, reloc
))
6491 /* We're not supposed to be called on FUNCTION_DECLs. */
6494 return readonly_data_section
;
6495 case SECCAT_RODATA_MERGE_STR
:
6496 return mergeable_string_section (decl
, align
, 0);
6497 case SECCAT_RODATA_MERGE_STR_INIT
:
6498 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6499 case SECCAT_RODATA_MERGE_CONST
:
6500 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6501 case SECCAT_SRODATA
:
6505 return data_section
;
6506 case SECCAT_DATA_REL
:
6507 sname
= ".data.rel";
6509 case SECCAT_DATA_REL_LOCAL
:
6510 sname
= ".data.rel.local";
6512 case SECCAT_DATA_REL_RO
:
6513 sname
= ".data.rel.ro";
6515 case SECCAT_DATA_REL_RO_LOCAL
:
6516 sname
= ".data.rel.ro.local";
6539 return get_named_section (decl
, sname
, reloc
);
6542 /* Construct a unique section name based on the decl name and the
6543 categorization performed above. */
6546 default_unique_section (tree decl
, int reloc
)
6548 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6549 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6550 const char *prefix
, *name
, *linkonce
;
6554 switch (categorize_decl_for_section (decl
, reloc
))
6557 prefix
= one_only
? ".t" : ".text";
6560 case SECCAT_RODATA_MERGE_STR
:
6561 case SECCAT_RODATA_MERGE_STR_INIT
:
6562 case SECCAT_RODATA_MERGE_CONST
:
6563 prefix
= one_only
? ".r" : ".rodata";
6565 case SECCAT_SRODATA
:
6566 prefix
= one_only
? ".s2" : ".sdata2";
6569 prefix
= one_only
? ".d" : ".data";
6571 case SECCAT_DATA_REL
:
6572 prefix
= one_only
? ".d.rel" : ".data.rel";
6574 case SECCAT_DATA_REL_LOCAL
:
6575 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6577 case SECCAT_DATA_REL_RO
:
6578 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6580 case SECCAT_DATA_REL_RO_LOCAL
:
6581 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6584 prefix
= one_only
? ".s" : ".sdata";
6587 prefix
= one_only
? ".b" : ".bss";
6590 prefix
= one_only
? ".sb" : ".sbss";
6593 prefix
= one_only
? ".td" : ".tdata";
6596 prefix
= one_only
? ".tb" : ".tbss";
6602 id
= DECL_ASSEMBLER_NAME (decl
);
6603 ultimate_transparent_alias_target (&id
);
6604 name
= IDENTIFIER_POINTER (id
);
6605 name
= targetm
.strip_name_encoding (name
);
6607 /* If we're using one_only, then there needs to be a .gnu.linkonce
6608 prefix to the section name. */
6609 linkonce
= one_only
? ".gnu.linkonce" : "";
6611 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6613 set_decl_section_name (decl
, string
);
6616 /* Subroutine of compute_reloc_for_rtx for leaf rtxes. */
6619 compute_reloc_for_rtx_1 (const_rtx x
)
6621 switch (GET_CODE (x
))
6624 return SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6632 /* Like compute_reloc_for_constant, except for an RTX. The return value
6633 is a mask for which bit 1 indicates a global relocation, and bit 0
6634 indicates a local relocation. */
6637 compute_reloc_for_rtx (const_rtx x
)
6639 switch (GET_CODE (x
))
6643 return compute_reloc_for_rtx_1 (x
);
6648 subrtx_iterator::array_type array
;
6649 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
6650 reloc
|= compute_reloc_for_rtx_1 (*iter
);
6660 default_select_rtx_section (machine_mode mode ATTRIBUTE_UNUSED
,
6662 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6664 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6665 return data_section
;
6667 return readonly_data_section
;
6671 default_elf_select_rtx_section (machine_mode mode
, rtx x
,
6672 unsigned HOST_WIDE_INT align
)
6674 int reloc
= compute_reloc_for_rtx (x
);
6676 /* ??? Handle small data here somehow. */
6678 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6681 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6683 return get_named_section (NULL
, ".data.rel.ro", 3);
6686 return mergeable_constant_section (mode
, align
, 0);
6689 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6692 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6697 /* Careful not to prod global register variables. */
6700 symbol
= XEXP (rtl
, 0);
6701 if (GET_CODE (symbol
) != SYMBOL_REF
)
6704 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6705 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6706 flags
|= SYMBOL_FLAG_FUNCTION
;
6707 if (targetm
.binds_local_p (decl
))
6708 flags
|= SYMBOL_FLAG_LOCAL
;
6709 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6710 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6711 else if (targetm
.in_small_data_p (decl
))
6712 flags
|= SYMBOL_FLAG_SMALL
;
6713 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6714 being PUBLIC, the thing *must* be defined in this translation unit.
6715 Prevent this buglet from being propagated into rtl code as well. */
6716 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6717 flags
|= SYMBOL_FLAG_EXTERNAL
;
6719 SYMBOL_REF_FLAGS (symbol
) = flags
;
6722 /* By default, we do nothing for encode_section_info, so we need not
6723 do anything but discard the '*' marker. */
6726 default_strip_name_encoding (const char *str
)
6728 return str
+ (*str
== '*');
6731 #ifdef ASM_OUTPUT_DEF
6732 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6733 anchor relative to ".", the current section position. */
6736 default_asm_output_anchor (rtx symbol
)
6740 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6741 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6742 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6746 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6749 default_use_anchors_for_symbol_p (const_rtx symbol
)
6754 /* Don't use anchors for mergeable sections. The linker might move
6755 the objects around. */
6756 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6757 if (sect
->common
.flags
& SECTION_MERGE
)
6760 /* Don't use anchors for small data sections. The small data register
6761 acts as an anchor for such sections. */
6762 if (sect
->common
.flags
& SECTION_SMALL
)
6765 decl
= SYMBOL_REF_DECL (symbol
);
6766 if (decl
&& DECL_P (decl
))
6768 /* Don't use section anchors for decls that might be defined or
6769 usurped by other modules. */
6770 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
6773 /* Don't use section anchors for decls that will be placed in a
6774 small data section. */
6775 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6776 one above. The problem is that we only use SECTION_SMALL for
6777 sections that should be marked as small in the section directive. */
6778 if (targetm
.in_small_data_p (decl
))
6784 /* Return true when RESOLUTION indicate that symbol will be bound to the
6785 definition provided by current .o file. */
6788 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6790 return (resolution
== LDPR_PREVAILING_DEF
6791 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6792 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6795 /* Return true when RESOLUTION indicate that symbol will be bound locally
6796 within current executable or DSO. */
6799 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6801 return (resolution
== LDPR_PREVAILING_DEF
6802 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6803 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6804 || resolution
== LDPR_PREEMPTED_REG
6805 || resolution
== LDPR_PREEMPTED_IR
6806 || resolution
== LDPR_RESOLVED_IR
6807 || resolution
== LDPR_RESOLVED_EXEC
);
6810 /* COMMON_LOCAL_P is true means that the linker can guarantee that an
6811 uninitialized common symbol in the executable will still be defined
6812 (through COPY relocation) in the executable. */
6815 default_binds_local_p_3 (const_tree exp
, bool shlib
, bool weak_dominate
,
6816 bool extern_protected_data
, bool common_local_p
)
6818 /* A non-decl is an entry in the constant pool. */
6822 /* Weakrefs may not bind locally, even though the weakref itself is always
6823 static and therefore local. Similarly, the resolver for ifunc functions
6824 might resolve to a non-local function.
6825 FIXME: We can resolve the weakref case more curefuly by looking at the
6827 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6828 || (TREE_CODE (exp
) == FUNCTION_DECL
6829 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6832 /* Static variables are always local. */
6833 if (! TREE_PUBLIC (exp
))
6836 /* With resolution file in hand, take look into resolutions.
6837 We can't just return true for resolved_locally symbols,
6838 because dynamic linking might overwrite symbols
6839 in shared libraries. */
6840 bool resolved_locally
= false;
6842 bool uninited_common
= (DECL_COMMON (exp
)
6843 && (DECL_INITIAL (exp
) == NULL
6845 && DECL_INITIAL (exp
) == error_mark_node
)));
6847 /* A non-external variable is defined locally only if it isn't
6848 uninitialized COMMON variable or common_local_p is true. */
6849 bool defined_locally
= (!DECL_EXTERNAL (exp
)
6850 && (!uninited_common
|| common_local_p
));
6851 if (symtab_node
*node
= symtab_node::get (exp
))
6853 if (node
->in_other_partition
)
6854 defined_locally
= true;
6855 if (resolution_to_local_definition_p (node
->resolution
))
6856 defined_locally
= resolved_locally
= true;
6857 else if (resolution_local_p (node
->resolution
))
6858 resolved_locally
= true;
6860 if (defined_locally
&& weak_dominate
&& !shlib
)
6861 resolved_locally
= true;
6863 /* Undefined weak symbols are never defined locally. */
6864 if (DECL_WEAK (exp
) && !defined_locally
)
6867 /* A symbol is local if the user has said explicitly that it will be,
6868 or if we have a definition for the symbol. We cannot infer visibility
6869 for undefined symbols. */
6870 if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
6871 && (TREE_CODE (exp
) == FUNCTION_DECL
6872 || !extern_protected_data
6873 || DECL_VISIBILITY (exp
) != VISIBILITY_PROTECTED
)
6874 && (DECL_VISIBILITY_SPECIFIED (exp
) || defined_locally
))
6877 /* If PIC, then assume that any global name can be overridden by
6878 symbols resolved from other modules. */
6882 /* Variables defined outside this object might not be local. */
6883 if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6886 /* Non-dominant weak symbols are not defined locally. */
6887 if (DECL_WEAK (exp
) && !resolved_locally
)
6890 /* Uninitialized COMMON variable may be unified with symbols
6891 resolved from other modules. */
6892 if (uninited_common
&& !resolved_locally
)
6895 /* Otherwise we're left with initialized (or non-common) global data
6896 which is of necessity defined locally. */
6900 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6901 wrt cross-module name binding. */
6904 default_binds_local_p (const_tree exp
)
6906 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, false, false);
6909 /* Similar to default_binds_local_p, but common symbol may be local. */
6912 default_binds_local_p_2 (const_tree exp
)
6914 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, false,
6919 default_binds_local_p_1 (const_tree exp
, int shlib
)
6921 return default_binds_local_p_3 (exp
, shlib
!= 0, false, false, false);
6924 /* Return true when references to DECL must bind to current definition in
6927 The condition is usually equivalent to whether the function binds to the
6928 current module (shared library or executable), that is to binds_local_p.
6929 We use this fact to avoid need for another target hook and implement
6930 the logic using binds_local_p and just special cases where
6931 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6932 the weak definitions (that can be overwritten at linktime by other
6933 definition from different object file) and when resolution info is available
6934 we simply use the knowledge passed to us by linker plugin. */
6936 decl_binds_to_current_def_p (const_tree decl
)
6938 gcc_assert (DECL_P (decl
));
6939 if (!targetm
.binds_local_p (decl
))
6941 if (!TREE_PUBLIC (decl
))
6944 /* When resolution is available, just use it. */
6945 if (symtab_node
*node
= symtab_node::get (decl
))
6947 if (node
->resolution
!= LDPR_UNKNOWN
)
6948 return resolution_to_local_definition_p (node
->resolution
);
6951 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6952 binds locally but still can be overwritten), DECL_COMMON (can be merged
6953 with a non-common definition somewhere in the same module) or
6955 This rely on fact that binds_local_p behave as decl_replaceable_p
6956 for all other declaration types. */
6957 if (DECL_WEAK (decl
))
6959 if (DECL_COMMON (decl
)
6960 && (DECL_INITIAL (decl
) == NULL
6961 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6963 if (DECL_EXTERNAL (decl
))
6968 /* A replaceable function or variable is one which may be replaced
6969 at link-time with an entirely different definition, provided that the
6970 replacement has the same type. For example, functions declared
6971 with __attribute__((weak)) on most systems are replaceable.
6973 COMDAT functions are not replaceable, since all definitions of the
6974 function must be equivalent. It is important that COMDAT functions
6975 not be treated as replaceable so that use of C++ template
6976 instantiations is not penalized. */
6979 decl_replaceable_p (tree decl
)
6981 gcc_assert (DECL_P (decl
));
6982 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
6984 if (!flag_semantic_interposition
6985 && !DECL_WEAK (decl
))
6987 return !decl_binds_to_current_def_p (decl
);
6990 /* Default function to output code that will globalize a label. A
6991 target must define GLOBAL_ASM_OP or provide its own function to
6992 globalize a label. */
6993 #ifdef GLOBAL_ASM_OP
6995 default_globalize_label (FILE * stream
, const char *name
)
6997 fputs (GLOBAL_ASM_OP
, stream
);
6998 assemble_name (stream
, name
);
6999 putc ('\n', stream
);
7001 #endif /* GLOBAL_ASM_OP */
7003 /* Default function to output code that will globalize a declaration. */
7005 default_globalize_decl_name (FILE * stream
, tree decl
)
7007 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
7008 targetm
.asm_out
.globalize_label (stream
, name
);
7011 /* Default function to output a label for unwind information. The
7012 default is to do nothing. A target that needs nonlocal labels for
7013 unwind information must provide its own function to do this. */
7015 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
7016 tree decl ATTRIBUTE_UNUSED
,
7017 int for_eh ATTRIBUTE_UNUSED
,
7018 int empty ATTRIBUTE_UNUSED
)
7022 /* Default function to output a label to divide up the exception table.
7023 The default is to do nothing. A target that needs/wants to divide
7024 up the table must provide it's own function to do this. */
7026 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
7030 /* This is how to output an internal numbered label where PREFIX is
7031 the class of label and LABELNO is the number within the class. */
7034 default_generate_internal_label (char *buf
, const char *prefix
,
7035 unsigned long labelno
)
7037 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7040 /* This is how to output an internal numbered label where PREFIX is
7041 the class of label and LABELNO is the number within the class. */
7044 default_internal_label (FILE *stream
, const char *prefix
,
7045 unsigned long labelno
)
7047 char *const buf
= (char *) alloca (40 + strlen (prefix
));
7048 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7049 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
7053 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
7056 default_asm_declare_constant_name (FILE *file
, const char *name
,
7057 const_tree exp ATTRIBUTE_UNUSED
,
7058 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
7060 assemble_label (file
, name
);
7063 /* This is the default behavior at the beginning of a file. It's
7064 controlled by two other target-hook toggles. */
7066 default_file_start (void)
7068 if (targetm
.asm_file_start_app_off
7069 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
7070 fputs (ASM_APP_OFF
, asm_out_file
);
7072 if (targetm
.asm_file_start_file_directive
)
7074 /* LTO produced units have no meaningful main_input_filename. */
7076 output_file_directive (asm_out_file
, "<artificial>");
7078 output_file_directive (asm_out_file
, main_input_filename
);
7082 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
7083 which emits a special section directive used to indicate whether or
7084 not this object file needs an executable stack. This is primarily
7085 a GNU extension to ELF but could be used on other targets. */
7087 int trampolines_created
;
7090 file_end_indicate_exec_stack (void)
7092 unsigned int flags
= SECTION_DEBUG
;
7093 if (trampolines_created
)
7094 flags
|= SECTION_CODE
;
7096 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
7099 /* Emit a special section directive to indicate that this object file
7100 was compiled with -fsplit-stack. This is used to let the linker
7101 detect calls between split-stack code and non-split-stack code, so
7102 that it can modify the split-stack code to allocate a sufficiently
7103 large stack. We emit another special section if there are any
7104 functions in this file which have the no_split_stack attribute, to
7105 prevent the linker from warning about being unable to convert the
7106 functions if they call non-split-stack code. */
7109 file_end_indicate_split_stack (void)
7111 if (flag_split_stack
)
7113 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
7115 if (saw_no_split_stack
)
7116 switch_to_section (get_section (".note.GNU-no-split-stack",
7117 SECTION_DEBUG
, NULL
));
7121 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
7122 a get_unnamed_section callback. */
7125 output_section_asm_op (const void *directive
)
7127 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
7130 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
7131 the current section is NEW_SECTION. */
7134 switch_to_section (section
*new_section
)
7136 if (in_section
== new_section
)
7139 if (new_section
->common
.flags
& SECTION_FORGET
)
7142 in_section
= new_section
;
7144 switch (SECTION_STYLE (new_section
))
7147 targetm
.asm_out
.named_section (new_section
->named
.name
,
7148 new_section
->named
.common
.flags
,
7149 new_section
->named
.decl
);
7152 case SECTION_UNNAMED
:
7153 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
7156 case SECTION_NOSWITCH
:
7161 new_section
->common
.flags
|= SECTION_DECLARED
;
7164 /* If block symbol SYMBOL has not yet been assigned an offset, place
7165 it at the end of its block. */
7168 place_block_symbol (rtx symbol
)
7170 unsigned HOST_WIDE_INT size
, mask
, offset
;
7171 struct constant_descriptor_rtx
*desc
;
7172 unsigned int alignment
;
7173 struct object_block
*block
;
7176 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7177 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7180 /* Work out the symbol's size and alignment. */
7181 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7183 desc
= SYMBOL_REF_CONSTANT (symbol
);
7184 alignment
= desc
->align
;
7185 size
= GET_MODE_SIZE (desc
->mode
);
7187 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7189 decl
= SYMBOL_REF_DECL (symbol
);
7190 gcc_checking_assert (DECL_IN_CONSTANT_POOL (decl
));
7191 alignment
= DECL_ALIGN (decl
);
7192 size
= get_constant_size (DECL_INITIAL (decl
));
7193 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7194 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7195 && asan_protect_global (DECL_INITIAL (decl
)))
7196 size
+= asan_red_zone_size (size
);
7200 struct symtab_node
*snode
;
7201 decl
= SYMBOL_REF_DECL (symbol
);
7203 snode
= symtab_node::get (decl
);
7206 rtx target
= DECL_RTL (snode
->ultimate_alias_target ()->decl
);
7208 gcc_assert (MEM_P (target
)
7209 && GET_CODE (XEXP (target
, 0)) == SYMBOL_REF
7210 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (target
, 0)));
7211 target
= XEXP (target
, 0);
7212 place_block_symbol (target
);
7213 SYMBOL_REF_BLOCK_OFFSET (symbol
) = SYMBOL_REF_BLOCK_OFFSET (target
);
7216 alignment
= get_variable_align (decl
);
7217 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7218 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7219 && asan_protect_global (decl
))
7221 size
+= asan_red_zone_size (size
);
7222 alignment
= MAX (alignment
,
7223 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7227 /* Calculate the object's offset from the start of the block. */
7228 block
= SYMBOL_REF_BLOCK (symbol
);
7229 mask
= alignment
/ BITS_PER_UNIT
- 1;
7230 offset
= (block
->size
+ mask
) & ~mask
;
7231 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7233 /* Record the block's new alignment and size. */
7234 block
->alignment
= MAX (block
->alignment
, alignment
);
7235 block
->size
= offset
+ size
;
7237 vec_safe_push (block
->objects
, symbol
);
7240 /* Return the anchor that should be used to address byte offset OFFSET
7241 from the first object in BLOCK. MODEL is the TLS model used
7245 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7246 enum tls_model model
)
7249 unsigned int begin
, middle
, end
;
7250 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7253 /* Work out the anchor's offset. Use an offset of 0 for the first
7254 anchor so that we don't pessimize the case where we take the address
7255 of a variable at the beginning of the block. This is particularly
7256 useful when a block has only one variable assigned to it.
7258 We try to place anchors RANGE bytes apart, so there can then be
7259 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7260 a ptr_mode offset. With some target settings, the lowest such
7261 anchor might be out of range for the lowest ptr_mode offset;
7262 likewise the highest anchor for the highest offset. Use anchors
7263 at the extreme ends of the ptr_mode range in such cases.
7265 All arithmetic uses unsigned integers in order to avoid
7267 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7268 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7269 range
= max_offset
- min_offset
+ 1;
7274 bias
= HOST_WIDE_INT_1U
<< (GET_MODE_BITSIZE (ptr_mode
) - 1);
7277 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7278 delta
-= delta
% range
;
7281 offset
= (HOST_WIDE_INT
) (-delta
);
7285 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7286 delta
-= delta
% range
;
7287 if (delta
> bias
- 1)
7289 offset
= (HOST_WIDE_INT
) delta
;
7293 /* Do a binary search to see if there's already an anchor we can use.
7294 Set BEGIN to the new anchor's index if not. */
7296 end
= vec_safe_length (block
->anchors
);
7297 while (begin
!= end
)
7299 middle
= (end
+ begin
) / 2;
7300 anchor
= (*block
->anchors
)[middle
];
7301 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7303 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7305 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7307 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7313 /* Create a new anchor with a unique label. */
7314 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7315 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7316 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7317 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7319 /* Insert it at index BEGIN. */
7320 vec_safe_insert (block
->anchors
, begin
, anchor
);
7324 /* Output the objects in BLOCK. */
7327 output_object_block (struct object_block
*block
)
7329 struct constant_descriptor_rtx
*desc
;
7331 HOST_WIDE_INT offset
;
7335 if (!block
->objects
)
7338 /* Switch to the section and make sure that the first byte is
7339 suitably aligned. */
7340 switch_to_section (block
->sect
);
7341 assemble_align (block
->alignment
);
7343 /* Define the values of all anchors relative to the current section
7345 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7346 targetm
.asm_out
.output_anchor (symbol
);
7348 /* Output the objects themselves. */
7350 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7352 /* Move to the object's offset, padding with zeros if necessary. */
7353 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7354 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7355 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7357 desc
= SYMBOL_REF_CONSTANT (symbol
);
7358 output_constant_pool_1 (desc
, 1);
7359 offset
+= GET_MODE_SIZE (desc
->mode
);
7361 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7364 decl
= SYMBOL_REF_DECL (symbol
);
7365 assemble_constant_contents
7366 (DECL_INITIAL (decl
), XSTR (symbol
, 0), DECL_ALIGN (decl
));
7368 size
= get_constant_size (DECL_INITIAL (decl
));
7370 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7371 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7372 && asan_protect_global (DECL_INITIAL (decl
)))
7374 size
= asan_red_zone_size (size
);
7375 assemble_zeros (size
);
7382 decl
= SYMBOL_REF_DECL (symbol
);
7383 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7384 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7386 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7387 && asan_protect_global (decl
))
7389 size
= asan_red_zone_size (size
);
7390 assemble_zeros (size
);
7397 /* A htab_traverse callback used to call output_object_block for
7398 each member of object_block_htab. */
7401 output_object_block_htab (object_block
**slot
, void *)
7403 output_object_block (*slot
);
7407 /* Output the definitions of all object_blocks. */
7410 output_object_blocks (void)
7412 object_block_htab
->traverse
<void *, output_object_block_htab
> (NULL
);
7415 /* This function provides a possible implementation of the
7416 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7417 by -frecord-gcc-switches it creates a new mergeable, string section in the
7418 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7419 contains the switches in ASCII format.
7421 FIXME: This code does not correctly handle double quote characters
7422 that appear inside strings, (it strips them rather than preserving them).
7423 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7424 characters - instead it treats them as sub-string separators. Since
7425 we want to emit NUL strings terminators into the object file we have to use
7429 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7433 case SWITCH_TYPE_PASSED
:
7434 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7435 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7438 case SWITCH_TYPE_DESCRIPTIVE
:
7441 /* Distinguish between invocations where name is NULL. */
7442 static bool started
= false;
7448 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7452 | (SECTION_ENTSIZE
& 1),
7454 switch_to_section (sec
);
7463 /* The return value is currently ignored by the caller, but must be 0.
7464 For -fverbose-asm the return value would be the number of characters
7465 emitted into the assembler file. */
7469 /* Emit text to declare externally defined symbols. It is needed to
7470 properly support non-default visibility. */
7472 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7474 const char *name ATTRIBUTE_UNUSED
)
7476 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7477 set in order to avoid putting out names that are never really
7478 used. Always output visibility specified in the source. */
7479 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7480 && (DECL_VISIBILITY_SPECIFIED (decl
)
7481 || targetm
.binds_local_p (decl
)))
7482 maybe_assemble_visibility (decl
);
7485 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7488 default_asm_output_source_filename (FILE *file
, const char *name
)
7490 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7491 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7493 fprintf (file
, "\t.file\t");
7494 output_quoted_string (file
, name
);
7499 /* Output a file name in the form wanted by System V. */
7502 output_file_directive (FILE *asm_file
, const char *input_name
)
7507 if (input_name
== NULL
)
7508 input_name
= "<stdin>";
7510 input_name
= remap_debug_filename (input_name
);
7512 len
= strlen (input_name
);
7513 na
= input_name
+ len
;
7515 /* NA gets INPUT_NAME sans directory names. */
7516 while (na
> input_name
)
7518 if (IS_DIR_SEPARATOR (na
[-1]))
7523 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7526 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7529 make_debug_expr_from_rtl (const_rtx exp
)
7531 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7532 machine_mode mode
= GET_MODE (exp
);
7535 DECL_ARTIFICIAL (ddecl
) = 1;
7536 if (REG_P (exp
) && REG_EXPR (exp
))
7537 type
= TREE_TYPE (REG_EXPR (exp
));
7538 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7539 type
= TREE_TYPE (MEM_EXPR (exp
));
7542 if (type
&& TYPE_MODE (type
) == mode
)
7543 TREE_TYPE (ddecl
) = type
;
7545 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7546 DECL_MODE (ddecl
) = mode
;
7547 dval
= gen_rtx_DEBUG_EXPR (mode
);
7548 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7549 SET_DECL_RTL (ddecl
, dval
);
7553 #ifdef ELF_ASCII_ESCAPES
7554 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7557 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7562 fputs (STRING_ASM_OP
, f
);
7567 escape
= ELF_ASCII_ESCAPES
[c
];
7574 /* TODO: Print in hex with fast function, important for -flto. */
7575 fprintf (f
, "\\%03o", c
);
7588 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7591 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7593 const char *limit
= s
+ len
;
7594 const char *last_null
= NULL
;
7595 unsigned bytes_in_chunk
= 0;
7599 for (; s
< limit
; s
++)
7603 if (bytes_in_chunk
>= 60)
7612 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7619 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7621 if (bytes_in_chunk
> 0)
7628 default_elf_asm_output_limited_string (f
, s
);
7633 if (bytes_in_chunk
== 0)
7634 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7637 escape
= ELF_ASCII_ESCAPES
[c
];
7645 /* TODO: Print in hex with fast function, important for -flto. */
7646 fprintf (f
, "\\%03o", c
);
7647 bytes_in_chunk
+= 4;
7652 bytes_in_chunk
+= 2;
7659 if (bytes_in_chunk
> 0)
7667 static GTY(()) section
*elf_init_array_section
;
7668 static GTY(()) section
*elf_fini_array_section
;
7671 get_elf_initfini_array_priority_section (int priority
,
7675 if (priority
!= DEFAULT_INIT_PRIORITY
)
7678 sprintf (buf
, "%s.%.5u",
7679 constructor_p
? ".init_array" : ".fini_array",
7681 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7687 if (elf_init_array_section
== NULL
)
7688 elf_init_array_section
7689 = get_section (".init_array",
7690 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7691 sec
= elf_init_array_section
;
7695 if (elf_fini_array_section
== NULL
)
7696 elf_fini_array_section
7697 = get_section (".fini_array",
7698 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7699 sec
= elf_fini_array_section
;
7705 /* Use .init_array section for constructors. */
7708 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7710 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7712 assemble_addr_to_section (symbol
, sec
);
7715 /* Use .fini_array section for destructors. */
7718 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7720 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7722 assemble_addr_to_section (symbol
, sec
);
7725 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7727 This is a bit of a cheat. The real default is a no-op, but this
7728 hook is the default for all targets with a .ident directive. */
7731 default_asm_output_ident_directive (const char *ident_str
)
7733 const char *ident_asm_op
= "\t.ident\t";
7735 /* If we are still in the front end, do not write out the string
7736 to asm_out_file. Instead, add a fake top-level asm statement.
7737 This allows the front ends to use this hook without actually
7738 writing to asm_out_file, to handle #ident or Pragma Ident. */
7739 if (symtab
->state
== PARSING
)
7741 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7742 symtab
->finalize_toplevel_asm (build_string (strlen (buf
), buf
));
7745 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7748 #include "gt-varasm.h"