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
,
1932 const char *name ATTRIBUTE_UNUSED
,
1933 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1934 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1936 int align
= symtab_node::get (decl
)->definition_alignment ();
1937 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1938 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1941 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1942 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, align
);
1945 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1950 /* A noswitch_section_callback for bss_noswitch_section. */
1952 #if defined ASM_OUTPUT_ALIGNED_BSS
1954 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1955 const char *name ATTRIBUTE_UNUSED
,
1956 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1957 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1959 #if defined ASM_OUTPUT_ALIGNED_BSS
1960 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
,
1961 get_variable_align (decl
));
1967 /* A noswitch_section_callback for comm_section. */
1970 emit_common (tree decl ATTRIBUTE_UNUSED
,
1971 const char *name ATTRIBUTE_UNUSED
,
1972 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1973 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1975 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1976 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1977 size
, get_variable_align (decl
));
1979 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1980 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
,
1981 get_variable_align (decl
));
1984 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1989 /* A noswitch_section_callback for tls_comm_section. */
1992 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1993 const char *name ATTRIBUTE_UNUSED
,
1994 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1995 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1997 #ifdef ASM_OUTPUT_TLS_COMMON
1998 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
2001 sorry ("thread-local COMMON data not implemented");
2006 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
2007 NAME is the name of DECL's SYMBOL_REF. */
2010 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
,
2013 unsigned HOST_WIDE_INT size
, rounded
;
2015 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2018 if ((flag_sanitize
& SANITIZE_ADDRESS
) && asan_protect_global (decl
))
2019 size
+= asan_red_zone_size (size
);
2021 /* Don't allocate zero bytes of common,
2022 since that means "undefined external" in the linker. */
2026 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2027 so that each uninitialized object starts on such a boundary. */
2028 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
2029 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2030 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2032 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
2033 && (unsigned HOST_WIDE_INT
) (align
/ BITS_PER_UNIT
) > rounded
)
2034 error ("requested alignment for %q+D is greater than "
2035 "implemented alignment of %wu", decl
, rounded
);
2038 /* A subroutine of assemble_variable. Output the label and contents of
2039 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
2040 is as for assemble_variable. */
2043 assemble_variable_contents (tree decl
, const char *name
,
2044 bool dont_output_data
)
2046 /* Do any machine/system dependent processing of the object. */
2047 #ifdef ASM_DECLARE_OBJECT_NAME
2048 last_assemble_variable_decl
= decl
;
2049 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
2051 /* Standard thing is just output label for the object. */
2052 ASM_OUTPUT_LABEL (asm_out_file
, name
);
2053 #endif /* ASM_DECLARE_OBJECT_NAME */
2055 if (!dont_output_data
)
2057 /* Caller is supposed to use varpool_get_constructor when it wants
2058 to output the body. */
2059 gcc_assert (!in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
);
2060 if (DECL_INITIAL (decl
)
2061 && DECL_INITIAL (decl
) != error_mark_node
2062 && !initializer_zerop (DECL_INITIAL (decl
)))
2063 /* Output the actual data. */
2064 output_constant (DECL_INITIAL (decl
),
2065 tree_to_uhwi (DECL_SIZE_UNIT (decl
)),
2066 get_variable_align (decl
));
2068 /* Leave space for it. */
2069 assemble_zeros (tree_to_uhwi (DECL_SIZE_UNIT (decl
)));
2070 targetm
.asm_out
.decl_end ();
2074 /* Write out assembly for the variable DECL, which is not defined in
2075 the current translation unit. */
2077 assemble_undefined_decl (tree decl
)
2079 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
2080 targetm
.asm_out
.assemble_undefined_decl (asm_out_file
, name
, decl
);
2083 /* Assemble everything that is needed for a variable or function declaration.
2084 Not used for automatic variables, and not used for function definitions.
2085 Should not be called for variables of incomplete structure type.
2087 TOP_LEVEL is nonzero if this variable has file scope.
2088 AT_END is nonzero if this is the special handling, at end of compilation,
2089 to define things that have had only tentative definitions.
2090 DONT_OUTPUT_DATA if nonzero means don't actually output the
2091 initial value (that will be done by the caller). */
2094 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
2095 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
2098 rtx decl_rtl
, symbol
;
2101 bool asan_protected
= false;
2103 /* This function is supposed to handle VARIABLES. Ensure we have one. */
2104 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
2106 /* Emulated TLS had better not get this far. */
2107 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
2109 last_assemble_variable_decl
= 0;
2111 /* Normally no need to say anything here for external references,
2112 since assemble_external is called by the language-specific code
2113 when a declaration is first seen. */
2115 if (DECL_EXTERNAL (decl
))
2118 /* Do nothing for global register variables. */
2119 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
2121 TREE_ASM_WRITTEN (decl
) = 1;
2125 /* If type was incomplete when the variable was declared,
2126 see if it is complete now. */
2128 if (DECL_SIZE (decl
) == 0)
2129 layout_decl (decl
, 0);
2131 /* Still incomplete => don't allocate it; treat the tentative defn
2132 (which is what it must have been) as an `extern' reference. */
2134 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2136 error ("storage size of %q+D isn%'t known", decl
);
2137 TREE_ASM_WRITTEN (decl
) = 1;
2141 /* The first declaration of a variable that comes through this function
2142 decides whether it is global (in C, has external linkage)
2143 or local (in C, has internal linkage). So do nothing more
2144 if this function has already run. */
2146 if (TREE_ASM_WRITTEN (decl
))
2149 /* Make sure targetm.encode_section_info is invoked before we set
2151 decl_rtl
= DECL_RTL (decl
);
2153 TREE_ASM_WRITTEN (decl
) = 1;
2155 /* Do no output if -fsyntax-only. */
2156 if (flag_syntax_only
)
2159 if (! dont_output_data
2160 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
2162 error ("size of variable %q+D is too large", decl
);
2166 gcc_assert (MEM_P (decl_rtl
));
2167 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2168 symbol
= XEXP (decl_rtl
, 0);
2170 /* If this symbol belongs to the tree constant pool, output the constant
2171 if it hasn't already been written. */
2172 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
2174 tree decl
= SYMBOL_REF_DECL (symbol
);
2175 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
2176 output_constant_def_contents (symbol
);
2182 name
= XSTR (symbol
, 0);
2183 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2184 notice_global_symbol (decl
);
2186 /* Compute the alignment of this data. */
2188 align_variable (decl
, dont_output_data
);
2190 if ((flag_sanitize
& SANITIZE_ADDRESS
)
2191 && asan_protect_global (decl
))
2193 asan_protected
= true;
2194 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
2195 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
2198 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2200 align
= get_variable_align (decl
);
2202 if (TREE_PUBLIC (decl
))
2203 maybe_assemble_visibility (decl
);
2205 if (DECL_PRESERVE_P (decl
))
2206 targetm
.asm_out
.mark_decl_preserved (name
);
2208 /* First make the assembler name(s) global if appropriate. */
2209 sect
= get_variable_section (decl
, false);
2210 if (TREE_PUBLIC (decl
)
2211 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2212 globalize_decl (decl
);
2214 /* Output any data that we will need to use the address of. */
2215 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2216 output_addressed_constants (DECL_INITIAL (decl
));
2218 /* dbxout.c needs to know this. */
2219 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2220 DECL_IN_TEXT_SECTION (decl
) = 1;
2222 /* If the decl is part of an object_block, make sure that the decl
2223 has been positioned within its block, but do not write out its
2224 definition yet. output_object_blocks will do that later. */
2225 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2227 gcc_assert (!dont_output_data
);
2228 place_block_symbol (symbol
);
2230 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2231 assemble_noswitch_variable (decl
, name
, sect
, align
);
2234 /* The following bit of code ensures that vtable_map
2235 variables are not only in the comdat section, but that
2236 each variable has its own unique comdat name. If this
2237 code is removed, the variables end up in the same section
2238 with a single comdat name.
2240 FIXME: resolve_unique_section needs to deal better with
2241 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
2242 that is fixed, this if-else statement can be replaced with
2243 a single call to "switch_to_section (sect)". */
2244 if (sect
->named
.name
2245 && (strcmp (sect
->named
.name
, ".vtable_map_vars") == 0))
2247 #if defined (OBJECT_FORMAT_ELF)
2248 targetm
.asm_out
.named_section (sect
->named
.name
,
2249 sect
->named
.common
.flags
2253 #elif defined (TARGET_PECOFF)
2254 /* Neither OBJECT_FORMAT_PE, nor OBJECT_FORMAT_COFF is set here.
2255 Therefore the following check is used.
2256 In case a the target is PE or COFF a comdat group section
2257 is created, e.g. .vtable_map_vars$foo. The linker places
2258 everything in .vtable_map_vars at the end.
2260 A fix could be made in
2261 gcc/config/i386/winnt.c: i386_pe_unique_section. */
2266 if (TREE_CODE (DECL_NAME (decl
)) == IDENTIFIER_NODE
)
2267 name
= ACONCAT ((sect
->named
.name
, "$",
2268 IDENTIFIER_POINTER (DECL_NAME (decl
)), NULL
));
2270 name
= ACONCAT ((sect
->named
.name
, "$",
2271 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (DECL_NAME (decl
))),
2274 targetm
.asm_out
.named_section (name
,
2275 sect
->named
.common
.flags
2281 switch_to_section (sect
);
2285 switch_to_section (sect
);
2286 if (align
> BITS_PER_UNIT
)
2287 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
2288 assemble_variable_contents (decl
, name
, dont_output_data
);
2291 unsigned HOST_WIDE_INT
int size
2292 = tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2293 assemble_zeros (asan_red_zone_size (size
));
2299 /* Given a function declaration (FN_DECL), this function assembles the
2300 function into the .preinit_array section. */
2303 assemble_vtv_preinit_initializer (tree fn_decl
)
2306 unsigned flags
= SECTION_WRITE
;
2307 rtx symbol
= XEXP (DECL_RTL (fn_decl
), 0);
2309 flags
|= SECTION_NOTYPE
;
2310 sect
= get_section (".preinit_array", flags
, fn_decl
);
2311 switch_to_section (sect
);
2312 assemble_addr_to_section (symbol
, sect
);
2315 /* Return 1 if type TYPE contains any pointers. */
2318 contains_pointers_p (tree type
)
2320 switch (TREE_CODE (type
))
2323 case REFERENCE_TYPE
:
2324 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2325 so I'll play safe and return 1. */
2331 case QUAL_UNION_TYPE
:
2334 /* For a type that has fields, see if the fields have pointers. */
2335 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2336 if (TREE_CODE (fields
) == FIELD_DECL
2337 && contains_pointers_p (TREE_TYPE (fields
)))
2343 /* An array type contains pointers if its element type does. */
2344 return contains_pointers_p (TREE_TYPE (type
));
2351 /* We delay assemble_external processing until
2352 the compilation unit is finalized. This is the best we can do for
2353 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2354 it all the way to final. See PR 17982 for further discussion. */
2355 static GTY(()) tree pending_assemble_externals
;
2357 #ifdef ASM_OUTPUT_EXTERNAL
2358 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2359 As a result, assemble_external can be called after the list of externals
2360 is processed and the pointer set destroyed. */
2361 static bool pending_assemble_externals_processed
;
2363 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2364 TREE_LIST in assemble_external. */
2365 static hash_set
<tree
> *pending_assemble_externals_set
;
2367 /* True if DECL is a function decl for which no out-of-line copy exists.
2368 It is assumed that DECL's assembler name has been set. */
2371 incorporeal_function_p (tree decl
)
2373 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2377 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2378 && (DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
2379 || DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA_WITH_ALIGN
))
2382 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2383 /* Atomic or sync builtins which have survived this far will be
2384 resolved externally and therefore are not incorporeal. */
2385 if (strncmp (name
, "__builtin_", 10) == 0)
2391 /* Actually do the tests to determine if this is necessary, and invoke
2392 ASM_OUTPUT_EXTERNAL. */
2394 assemble_external_real (tree decl
)
2396 rtx rtl
= DECL_RTL (decl
);
2398 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2399 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2400 && !incorporeal_function_p (decl
))
2402 /* Some systems do require some output. */
2403 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2404 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2410 process_pending_assemble_externals (void)
2412 #ifdef ASM_OUTPUT_EXTERNAL
2414 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2415 assemble_external_real (TREE_VALUE (list
));
2417 pending_assemble_externals
= 0;
2418 pending_assemble_externals_processed
= true;
2419 delete pending_assemble_externals_set
;
2423 /* This TREE_LIST contains any weak symbol declarations waiting
2425 static GTY(()) tree weak_decls
;
2427 /* Output something to declare an external symbol to the assembler,
2428 and qualifiers such as weakness. (Most assemblers don't need
2429 extern declaration, so we normally output nothing.) Do nothing if
2430 DECL is not external. */
2433 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2435 /* Make sure that the ASM_OUT_FILE is open.
2436 If it's not, we should not be calling this function. */
2437 gcc_assert (asm_out_file
);
2439 /* In a perfect world, the following condition would be true.
2440 Sadly, the Java and Go front ends emit assembly *from the front end*,
2441 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2443 /* This function should only be called if we are expanding, or have
2445 Ideally, only final.c would be calling this function, but it is
2446 not clear whether that would break things somehow. See PR 17982
2447 for further discussion. */
2448 gcc_assert (state
== EXPANSION
2449 || state
== FINISHED
);
2452 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2455 /* We want to output annotation for weak and external symbols at
2456 very last to check if they are references or not. */
2458 if (TARGET_SUPPORTS_WEAK
2460 /* TREE_STATIC is a weird and abused creature which is not
2461 generally the right test for whether an entity has been
2462 locally emitted, inlined or otherwise not-really-extern, but
2463 for declarations that can be weak, it happens to be
2465 && !TREE_STATIC (decl
)
2466 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2467 && value_member (decl
, weak_decls
) == NULL_TREE
)
2468 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2470 #ifdef ASM_OUTPUT_EXTERNAL
2471 if (pending_assemble_externals_processed
)
2473 assemble_external_real (decl
);
2477 if (! pending_assemble_externals_set
->add (decl
))
2478 pending_assemble_externals
= tree_cons (NULL
, decl
,
2479 pending_assemble_externals
);
2483 /* Similar, for calling a library function FUN. */
2486 assemble_external_libcall (rtx fun
)
2488 /* Declare library function name external when first used, if nec. */
2489 if (! SYMBOL_REF_USED (fun
))
2491 SYMBOL_REF_USED (fun
) = 1;
2492 targetm
.asm_out
.external_libcall (fun
);
2496 /* Assemble a label named NAME. */
2499 assemble_label (FILE *file
, const char *name
)
2501 ASM_OUTPUT_LABEL (file
, name
);
2504 /* Set the symbol_referenced flag for ID. */
2506 mark_referenced (tree id
)
2508 TREE_SYMBOL_REFERENCED (id
) = 1;
2511 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2513 mark_decl_referenced (tree decl
)
2515 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2517 /* Extern inline functions don't become needed when referenced.
2518 If we know a method will be emitted in other TU and no new
2519 functions can be marked reachable, just use the external
2521 struct cgraph_node
*node
= cgraph_node::get_create (decl
);
2522 if (!DECL_EXTERNAL (decl
)
2523 && !node
->definition
)
2524 node
->mark_force_output ();
2526 else if (TREE_CODE (decl
) == VAR_DECL
)
2528 varpool_node
*node
= varpool_node::get_create (decl
);
2529 /* C++ frontend use mark_decl_references to force COMDAT variables
2530 to be output that might appear dead otherwise. */
2531 node
->force_output
= true;
2533 /* else do nothing - we can get various sorts of CST nodes here,
2534 which do not need to be marked. */
2538 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2539 starts with a *, the rest of NAME is output verbatim. Otherwise
2540 NAME is transformed in a target-specific way (usually by the
2541 addition of an underscore). */
2544 assemble_name_raw (FILE *file
, const char *name
)
2547 fputs (&name
[1], file
);
2549 ASM_OUTPUT_LABELREF (file
, name
);
2552 /* Like assemble_name_raw, but should be used when NAME might refer to
2553 an entity that is also represented as a tree (like a function or
2554 variable). If NAME does refer to such an entity, that entity will
2555 be marked as referenced. */
2558 assemble_name (FILE *file
, const char *name
)
2560 const char *real_name
;
2563 real_name
= targetm
.strip_name_encoding (name
);
2565 id
= maybe_get_identifier (real_name
);
2570 mark_referenced (id
);
2571 ultimate_transparent_alias_target (&id
);
2573 name
= IDENTIFIER_POINTER (id
);
2574 gcc_assert (! TREE_CHAIN (id
));
2577 assemble_name_raw (file
, name
);
2580 /* Allocate SIZE bytes writable static space with a gensym name
2581 and return an RTX to refer to its address. */
2584 assemble_static_space (unsigned HOST_WIDE_INT size
)
2587 const char *namestring
;
2590 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2592 namestring
= ggc_strdup (name
);
2594 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2595 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2597 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2598 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2601 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2602 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2605 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2606 so that each uninitialized object starts on such a boundary. */
2607 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2608 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2609 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2610 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2611 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2612 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2619 /* Assemble the static constant template for function entry trampolines.
2620 This is done at most once per compilation.
2621 Returns an RTX for the address of the template. */
2623 static GTY(()) rtx initial_trampoline
;
2626 assemble_trampoline_template (void)
2633 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2635 if (initial_trampoline
)
2636 return initial_trampoline
;
2638 /* By default, put trampoline templates in read-only data section. */
2640 #ifdef TRAMPOLINE_SECTION
2641 switch_to_section (TRAMPOLINE_SECTION
);
2643 switch_to_section (readonly_data_section
);
2646 /* Write the assembler code to define one. */
2647 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2649 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2651 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2652 targetm
.asm_out
.trampoline_template (asm_out_file
);
2654 /* Record the rtl to refer to it. */
2655 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2656 name
= ggc_strdup (label
);
2657 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2658 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2660 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2661 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2662 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2664 return initial_trampoline
;
2667 /* A and B are either alignments or offsets. Return the minimum alignment
2668 that may be assumed after adding the two together. */
2670 static inline unsigned
2671 min_align (unsigned int a
, unsigned int b
)
2673 return (a
| b
) & -(a
| b
);
2676 /* Return the assembler directive for creating a given kind of integer
2677 object. SIZE is the number of bytes in the object and ALIGNED_P
2678 indicates whether it is known to be aligned. Return NULL if the
2679 assembly dialect has no such directive.
2681 The returned string should be printed at the start of a new line and
2682 be followed immediately by the object's initial value. */
2685 integer_asm_op (int size
, int aligned_p
)
2687 struct asm_int_op
*ops
;
2690 ops
= &targetm
.asm_out
.aligned_op
;
2692 ops
= &targetm
.asm_out
.unaligned_op
;
2697 return targetm
.asm_out
.byte_op
;
2711 /* Use directive OP to assemble an integer object X. Print OP at the
2712 start of the line, followed immediately by the value of X. */
2715 assemble_integer_with_op (const char *op
, rtx x
)
2717 fputs (op
, asm_out_file
);
2718 output_addr_const (asm_out_file
, x
);
2719 fputc ('\n', asm_out_file
);
2722 /* The default implementation of the asm_out.integer target hook. */
2725 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2726 unsigned int size ATTRIBUTE_UNUSED
,
2727 int aligned_p ATTRIBUTE_UNUSED
)
2729 const char *op
= integer_asm_op (size
, aligned_p
);
2730 /* Avoid GAS bugs for large values. Specifically negative values whose
2731 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2732 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE_UNITS
)
2734 return op
&& (assemble_integer_with_op (op
, x
), true);
2737 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2738 the alignment of the integer in bits. Return 1 if we were able to output
2739 the constant, otherwise 0. We must be able to output the constant,
2740 if FORCE is nonzero. */
2743 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2747 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2749 /* See if the target hook can handle this kind of object. */
2750 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2753 /* If the object is a multi-byte one, try splitting it up. Split
2754 it into words it if is multi-word, otherwise split it into bytes. */
2757 machine_mode omode
, imode
;
2758 unsigned int subalign
;
2759 unsigned int subsize
, i
;
2760 enum mode_class mclass
;
2762 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2763 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2764 if (GET_CODE (x
) == CONST_FIXED
)
2765 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2769 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2770 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2772 for (i
= 0; i
< size
; i
+= subsize
)
2774 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2775 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2781 /* If we've printed some of it, but not all of it, there's no going
2786 gcc_assert (!force
);
2792 assemble_real (REAL_VALUE_TYPE d
, machine_mode mode
, unsigned int align
)
2794 long data
[4] = {0, 0, 0, 0};
2796 int bitsize
, nelts
, nunits
, units_per
;
2798 /* This is hairy. We have a quantity of known size. real_to_target
2799 will put it into an array of *host* longs, 32 bits per element
2800 (even if long is more than 32 bits). We need to determine the
2801 number of array elements that are occupied (nelts) and the number
2802 of *target* min-addressable units that will be occupied in the
2803 object file (nunits). We cannot assume that 32 divides the
2804 mode's bitsize (size * BITS_PER_UNIT) evenly.
2806 size * BITS_PER_UNIT is used here to make sure that padding bits
2807 (which might appear at either end of the value; real_to_target
2808 will include the padding bits in its output array) are included. */
2810 nunits
= GET_MODE_SIZE (mode
);
2811 bitsize
= nunits
* BITS_PER_UNIT
;
2812 nelts
= CEIL (bitsize
, 32);
2813 units_per
= 32 / BITS_PER_UNIT
;
2815 real_to_target (data
, &d
, mode
);
2817 /* Put out the first word with the specified alignment. */
2818 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2819 nunits
-= units_per
;
2821 /* Subsequent words need only 32-bit alignment. */
2822 align
= min_align (align
, 32);
2824 for (i
= 1; i
< nelts
; i
++)
2826 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2827 nunits
-= units_per
;
2831 /* Given an expression EXP with a constant value,
2832 reduce it to the sum of an assembler symbol and an integer.
2833 Store them both in the structure *VALUE.
2834 EXP must be reducible. */
2838 HOST_WIDE_INT offset
;
2842 decode_addr_const (tree exp
, struct addr_const
*value
)
2844 tree target
= TREE_OPERAND (exp
, 0);
2850 if (TREE_CODE (target
) == COMPONENT_REF
2851 && tree_fits_shwi_p (byte_position (TREE_OPERAND (target
, 1))))
2853 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2854 target
= TREE_OPERAND (target
, 0);
2856 else if (TREE_CODE (target
) == ARRAY_REF
2857 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2859 offset
+= (tree_to_uhwi (TYPE_SIZE_UNIT (TREE_TYPE (target
)))
2860 * tree_to_shwi (TREE_OPERAND (target
, 1)));
2861 target
= TREE_OPERAND (target
, 0);
2863 else if (TREE_CODE (target
) == MEM_REF
2864 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2866 offset
+= mem_ref_offset (target
).to_short_addr ();
2867 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2869 else if (TREE_CODE (target
) == INDIRECT_REF
2870 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2871 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2873 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2878 switch (TREE_CODE (target
))
2882 x
= DECL_RTL (target
);
2886 x
= gen_rtx_MEM (FUNCTION_MODE
,
2887 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2896 x
= output_constant_def (target
, 1);
2903 gcc_assert (MEM_P (x
));
2907 value
->offset
= offset
;
2910 static GTY(()) hash_table
<tree_descriptor_hasher
> *const_desc_htab
;
2912 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2914 /* Constant pool accessor function. */
2916 hash_table
<tree_descriptor_hasher
> *
2917 constant_pool_htab (void)
2919 return const_desc_htab
;
2922 /* Compute a hash code for a constant expression. */
2925 tree_descriptor_hasher::hash (constant_descriptor_tree
*ptr
)
2931 const_hash_1 (const tree exp
)
2936 enum tree_code code
= TREE_CODE (exp
);
2938 /* Either set P and LEN to the address and len of something to hash and
2939 exit the switch or return a value. */
2944 p
= (char *) &TREE_INT_CST_ELT (exp
, 0);
2945 len
= TREE_INT_CST_NUNITS (exp
) * sizeof (HOST_WIDE_INT
);
2949 return real_hash (TREE_REAL_CST_PTR (exp
));
2952 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2955 p
= TREE_STRING_POINTER (exp
);
2956 len
= TREE_STRING_LENGTH (exp
);
2960 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2961 + const_hash_1 (TREE_IMAGPART (exp
)));
2967 hi
= 7 + VECTOR_CST_NELTS (exp
);
2969 for (i
= 0; i
< VECTOR_CST_NELTS (exp
); ++i
)
2970 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ELT (exp
, i
));
2977 unsigned HOST_WIDE_INT idx
;
2980 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2982 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2984 hi
= hi
* 603 + const_hash_1 (value
);
2992 struct addr_const value
;
2994 decode_addr_const (exp
, &value
);
2995 switch (GET_CODE (value
.base
))
2998 /* Don't hash the address of the SYMBOL_REF;
2999 only use the offset and the symbol name. */
3001 p
= XSTR (value
.base
, 0);
3002 for (i
= 0; p
[i
] != 0; i
++)
3003 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3008 + CODE_LABEL_NUMBER (LABEL_REF_LABEL (value
.base
)) * 13);
3018 case POINTER_PLUS_EXPR
:
3020 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
3021 + const_hash_1 (TREE_OPERAND (exp
, 1)));
3024 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
3027 /* A language specific constant. Just hash the code. */
3031 /* Compute hashing function. */
3033 for (i
= 0; i
< len
; i
++)
3034 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3039 /* Wrapper of compare_constant, for the htab interface. */
3041 tree_descriptor_hasher::equal (constant_descriptor_tree
*c1
,
3042 constant_descriptor_tree
*c2
)
3044 if (c1
->hash
!= c2
->hash
)
3046 return compare_constant (c1
->value
, c2
->value
);
3049 /* Compare t1 and t2, and return 1 only if they are known to result in
3050 the same bit pattern on output. */
3053 compare_constant (const tree t1
, const tree t2
)
3055 enum tree_code typecode
;
3057 if (t1
== NULL_TREE
)
3058 return t2
== NULL_TREE
;
3059 if (t2
== NULL_TREE
)
3062 if (TREE_CODE (t1
) != TREE_CODE (t2
))
3065 switch (TREE_CODE (t1
))
3068 /* Integer constants are the same only if the same width of type. */
3069 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3071 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3073 return tree_int_cst_equal (t1
, t2
);
3076 /* Real constants are the same only if the same width of type. */
3077 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3080 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
3083 /* Fixed constants are the same only if the same width of type. */
3084 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3087 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
3090 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3093 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
3094 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
3095 TREE_STRING_LENGTH (t1
)));
3098 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
3099 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
3105 if (VECTOR_CST_NELTS (t1
) != VECTOR_CST_NELTS (t2
))
3108 for (i
= 0; i
< VECTOR_CST_NELTS (t1
); ++i
)
3109 if (!compare_constant (VECTOR_CST_ELT (t1
, i
),
3110 VECTOR_CST_ELT (t2
, i
)))
3118 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
3119 unsigned HOST_WIDE_INT idx
;
3121 typecode
= TREE_CODE (TREE_TYPE (t1
));
3122 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
3125 if (typecode
== ARRAY_TYPE
)
3127 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
3128 /* For arrays, check that the sizes all match. */
3129 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
3131 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
3136 /* For record and union constructors, require exact type
3138 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
3142 v1
= CONSTRUCTOR_ELTS (t1
);
3143 v2
= CONSTRUCTOR_ELTS (t2
);
3144 if (vec_safe_length (v1
) != vec_safe_length (v2
))
3147 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
3149 constructor_elt
*c1
= &(*v1
)[idx
];
3150 constructor_elt
*c2
= &(*v2
)[idx
];
3152 /* Check that each value is the same... */
3153 if (!compare_constant (c1
->value
, c2
->value
))
3155 /* ... and that they apply to the same fields! */
3156 if (typecode
== ARRAY_TYPE
)
3158 if (!compare_constant (c1
->index
, c2
->index
))
3163 if (c1
->index
!= c2
->index
)
3174 struct addr_const value1
, value2
;
3178 decode_addr_const (t1
, &value1
);
3179 decode_addr_const (t2
, &value2
);
3181 if (value1
.offset
!= value2
.offset
)
3184 code
= GET_CODE (value1
.base
);
3185 if (code
!= GET_CODE (value2
.base
))
3191 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3195 ret
= (CODE_LABEL_NUMBER (LABEL_REF_LABEL (value1
.base
))
3196 == CODE_LABEL_NUMBER (LABEL_REF_LABEL (value2
.base
)));
3206 case POINTER_PLUS_EXPR
:
3209 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3210 && compare_constant (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3213 case VIEW_CONVERT_EXPR
:
3214 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3223 /* Return the section into which constant EXP should be placed. */
3226 get_constant_section (tree exp
, unsigned int align
)
3228 return targetm
.asm_out
.select_section (exp
,
3229 compute_reloc_for_constant (exp
),
3233 /* Return the size of constant EXP in bytes. */
3235 static HOST_WIDE_INT
3236 get_constant_size (tree exp
)
3240 size
= int_size_in_bytes (TREE_TYPE (exp
));
3241 if (TREE_CODE (exp
) == STRING_CST
)
3242 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3246 /* Subroutine of output_constant_def:
3247 No constant equal to EXP is known to have been output.
3248 Make a constant descriptor to enter EXP in the hash table.
3249 Assign the label number and construct RTL to refer to the
3250 constant's location in memory.
3251 Caller is responsible for updating the hash table. */
3253 static struct constant_descriptor_tree
*
3254 build_constant_desc (tree exp
)
3256 struct constant_descriptor_tree
*desc
;
3262 desc
= ggc_alloc
<constant_descriptor_tree
> ();
3265 /* Create a string containing the label name, in LABEL. */
3266 labelno
= const_labelno
++;
3267 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3269 /* Construct the VAR_DECL associated with the constant. */
3270 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3272 DECL_ARTIFICIAL (decl
) = 1;
3273 DECL_IGNORED_P (decl
) = 1;
3274 TREE_READONLY (decl
) = 1;
3275 TREE_STATIC (decl
) = 1;
3276 TREE_ADDRESSABLE (decl
) = 1;
3277 /* We don't set the RTL yet as this would cause varpool to assume that the
3278 variable is referenced. Moreover, it would just be dropped in LTO mode.
3279 Instead we set the flag that will be recognized in make_decl_rtl. */
3280 DECL_IN_CONSTANT_POOL (decl
) = 1;
3281 DECL_INITIAL (decl
) = desc
->value
;
3282 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3283 architectures so use DATA_ALIGNMENT as well, except for strings. */
3284 if (TREE_CODE (exp
) == STRING_CST
)
3286 #ifdef CONSTANT_ALIGNMENT
3287 DECL_ALIGN (decl
) = CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
));
3291 align_variable (decl
, 0);
3293 /* Now construct the SYMBOL_REF and the MEM. */
3294 if (use_object_blocks_p ())
3296 int align
= (TREE_CODE (decl
) == CONST_DECL
3297 || (TREE_CODE (decl
) == VAR_DECL
3298 && DECL_IN_CONSTANT_POOL (decl
))
3300 : symtab_node::get (decl
)->definition_alignment ());
3301 section
*sect
= get_constant_section (exp
, align
);
3302 symbol
= create_block_symbol (ggc_strdup (label
),
3303 get_block_for_section (sect
), -1);
3306 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3307 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3308 SET_SYMBOL_REF_DECL (symbol
, decl
);
3309 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3311 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3312 set_mem_attributes (rtl
, exp
, 1);
3313 set_mem_alias_set (rtl
, 0);
3315 /* We cannot share RTX'es in pool entries.
3316 Mark this piece of RTL as required for unsharing. */
3317 RTX_FLAG (rtl
, used
) = 1;
3319 /* Set flags or add text to the name to record information, such as
3320 that it is a local symbol. If the name is changed, the macro
3321 ASM_OUTPUT_LABELREF will have to know how to strip this
3322 information. This call might invalidate our local variable
3323 SYMBOL; we can't use it afterward. */
3324 targetm
.encode_section_info (exp
, rtl
, true);
3331 /* Return an rtx representing a reference to constant data in memory
3332 for the constant expression EXP.
3334 If assembler code for such a constant has already been output,
3335 return an rtx to refer to it.
3336 Otherwise, output such a constant in memory
3337 and generate an rtx for it.
3339 If DEFER is nonzero, this constant can be deferred and output only
3340 if referenced in the function after all optimizations.
3342 `const_desc_table' records which constants already have label strings. */
3345 output_constant_def (tree exp
, int defer
)
3347 struct constant_descriptor_tree
*desc
;
3348 struct constant_descriptor_tree key
;
3350 /* Look up EXP in the table of constant descriptors. If we didn't find
3351 it, create a new one. */
3353 key
.hash
= const_hash_1 (exp
);
3354 constant_descriptor_tree
**loc
3355 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3360 desc
= build_constant_desc (exp
);
3361 desc
->hash
= key
.hash
;
3365 maybe_output_constant_def_contents (desc
, defer
);
3369 /* Subroutine of output_constant_def: Decide whether or not we need to
3370 output the constant DESC now, and if so, do it. */
3372 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3375 rtx symbol
= XEXP (desc
->rtl
, 0);
3376 tree exp
= desc
->value
;
3378 if (flag_syntax_only
)
3381 if (TREE_ASM_WRITTEN (exp
))
3382 /* Already output; don't do it again. */
3385 /* We can always defer constants as long as the context allows
3389 /* Increment n_deferred_constants if it exists. It needs to be at
3390 least as large as the number of constants actually referred to
3391 by the function. If it's too small we'll stop looking too early
3392 and fail to emit constants; if it's too large we'll only look
3393 through the entire function when we could have stopped earlier. */
3395 n_deferred_constants
++;
3399 output_constant_def_contents (symbol
);
3402 /* Subroutine of output_constant_def_contents. Output the definition
3403 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3404 constant's alignment in bits. */
3407 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3411 size
= get_constant_size (exp
);
3413 /* Do any machine/system dependent processing of the constant. */
3414 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3416 /* Output the value of EXP. */
3417 output_constant (exp
, size
, align
);
3419 targetm
.asm_out
.decl_end ();
3422 /* We must output the constant data referred to by SYMBOL; do so. */
3425 output_constant_def_contents (rtx symbol
)
3427 tree decl
= SYMBOL_REF_DECL (symbol
);
3428 tree exp
= DECL_INITIAL (decl
);
3429 bool asan_protected
= false;
3431 /* Make sure any other constants whose addresses appear in EXP
3432 are assigned label numbers. */
3433 output_addressed_constants (exp
);
3435 /* We are no longer deferring this constant. */
3436 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3438 if ((flag_sanitize
& SANITIZE_ADDRESS
)
3439 && TREE_CODE (exp
) == STRING_CST
3440 && asan_protect_global (exp
))
3442 asan_protected
= true;
3443 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
3444 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
3447 /* If the constant is part of an object block, make sure that the
3448 decl has been positioned within its block, but do not write out
3449 its definition yet. output_object_blocks will do that later. */
3450 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3451 place_block_symbol (symbol
);
3454 int align
= (TREE_CODE (decl
) == CONST_DECL
3455 || (TREE_CODE (decl
) == VAR_DECL
3456 && DECL_IN_CONSTANT_POOL (decl
))
3458 : symtab_node::get (decl
)->definition_alignment ());
3459 switch_to_section (get_constant_section (exp
, align
));
3460 if (align
> BITS_PER_UNIT
)
3461 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3462 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3465 HOST_WIDE_INT size
= get_constant_size (exp
);
3466 assemble_zeros (asan_red_zone_size (size
));
3471 /* Look up EXP in the table of constant descriptors. Return the rtl
3472 if it has been emitted, else null. */
3475 lookup_constant_def (tree exp
)
3477 struct constant_descriptor_tree key
;
3480 key
.hash
= const_hash_1 (exp
);
3481 constant_descriptor_tree
*desc
3482 = const_desc_htab
->find_with_hash (&key
, key
.hash
);
3484 return (desc
? desc
->rtl
: NULL_RTX
);
3487 /* Return a tree representing a reference to constant data in memory
3488 for the constant expression EXP.
3490 This is the counterpart of output_constant_def at the Tree level. */
3493 tree_output_constant_def (tree exp
)
3495 struct constant_descriptor_tree
*desc
, key
;
3498 /* Look up EXP in the table of constant descriptors. If we didn't find
3499 it, create a new one. */
3501 key
.hash
= const_hash_1 (exp
);
3502 constant_descriptor_tree
**loc
3503 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3508 desc
= build_constant_desc (exp
);
3509 desc
->hash
= key
.hash
;
3513 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3514 varpool_node::finalize_decl (decl
);
3518 struct GTY((chain_next ("%h.next"), for_user
)) constant_descriptor_rtx
{
3519 struct constant_descriptor_rtx
*next
;
3523 HOST_WIDE_INT offset
;
3531 struct const_rtx_desc_hasher
: ggc_hasher
<constant_descriptor_rtx
*>
3533 static hashval_t
hash (constant_descriptor_rtx
*);
3534 static bool equal (constant_descriptor_rtx
*, constant_descriptor_rtx
*);
3537 /* Used in the hash tables to avoid outputting the same constant
3538 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3539 are output once per function, not once per file. */
3540 /* ??? Only a few targets need per-function constant pools. Most
3541 can use one per-file pool. Should add a targetm bit to tell the
3544 struct GTY(()) rtx_constant_pool
{
3545 /* Pointers to first and last constant in pool, as ordered by offset. */
3546 struct constant_descriptor_rtx
*first
;
3547 struct constant_descriptor_rtx
*last
;
3549 /* Hash facility for making memory-constants from constant rtl-expressions.
3550 It is used on RISC machines where immediate integer arguments and
3551 constant addresses are restricted so that such constants must be stored
3553 hash_table
<const_rtx_desc_hasher
> *const_rtx_htab
;
3555 /* Current offset in constant pool (does not include any
3556 machine-specific header). */
3557 HOST_WIDE_INT offset
;
3560 /* Hash and compare functions for const_rtx_htab. */
3563 const_rtx_desc_hasher::hash (constant_descriptor_rtx
*desc
)
3569 const_rtx_desc_hasher::equal (constant_descriptor_rtx
*x
,
3570 constant_descriptor_rtx
*y
)
3572 if (x
->mode
!= y
->mode
)
3574 return rtx_equal_p (x
->constant
, y
->constant
);
3577 /* Hash one component of a constant. */
3580 const_rtx_hash_1 (const_rtx x
)
3582 unsigned HOST_WIDE_INT hwi
;
3588 code
= GET_CODE (x
);
3589 mode
= GET_MODE (x
);
3590 h
= (hashval_t
) code
* 1048573 + mode
;
3599 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3600 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3602 h
^= (hashval_t
) hwi
;
3603 for (i
= 1; i
< n
; ++i
)
3606 h
^= (hashval_t
) hwi
;
3611 case CONST_WIDE_INT
:
3612 hwi
= GET_MODE_PRECISION (mode
);
3614 for (i
= 0; i
< CONST_WIDE_INT_NUNITS (x
); i
++)
3615 hwi
^= CONST_WIDE_INT_ELT (x
, i
);
3620 if (TARGET_SUPPORTS_WIDE_INT
== 0 && mode
== VOIDmode
)
3622 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3626 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3630 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3634 h
^= htab_hash_string (XSTR (x
, 0));
3638 h
= h
* 251 + CODE_LABEL_NUMBER (LABEL_REF_LABEL (x
));
3642 case UNSPEC_VOLATILE
:
3643 h
= h
* 251 + XINT (x
, 1);
3653 /* Compute a hash value for X, which should be a constant. */
3656 const_rtx_hash (rtx x
)
3659 subrtx_iterator::array_type array
;
3660 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
3661 h
= h
* 509 + const_rtx_hash_1 (*iter
);
3666 /* Create and return a new rtx constant pool. */
3668 static struct rtx_constant_pool
*
3669 create_constant_pool (void)
3671 struct rtx_constant_pool
*pool
;
3673 pool
= ggc_alloc
<rtx_constant_pool
> ();
3674 pool
->const_rtx_htab
= hash_table
<const_rtx_desc_hasher
>::create_ggc (31);
3681 /* Initialize constant pool hashing for a new function. */
3684 init_varasm_status (void)
3686 crtl
->varasm
.pool
= create_constant_pool ();
3687 crtl
->varasm
.deferred_constants
= 0;
3690 /* Given a MINUS expression, simplify it if both sides
3691 include the same symbol. */
3694 simplify_subtraction (rtx x
)
3696 rtx r
= simplify_rtx (x
);
3700 /* Given a constant rtx X, make (or find) a memory constant for its value
3701 and return a MEM rtx to refer to it in memory. */
3704 force_const_mem (machine_mode mode
, rtx x
)
3706 struct constant_descriptor_rtx
*desc
, tmp
;
3707 struct rtx_constant_pool
*pool
;
3712 constant_descriptor_rtx
**slot
;
3714 /* If we're not allowed to drop X into the constant pool, don't. */
3715 if (targetm
.cannot_force_const_mem (mode
, x
))
3718 /* Record that this function has used a constant pool entry. */
3719 crtl
->uses_const_pool
= 1;
3721 /* Decide which pool to use. */
3722 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3723 ? shared_constant_pool
3724 : crtl
->varasm
.pool
);
3726 /* Lookup the value in the hashtable. */
3729 hash
= const_rtx_hash (x
);
3730 slot
= pool
->const_rtx_htab
->find_slot_with_hash (&tmp
, hash
, INSERT
);
3733 /* If the constant was already present, return its memory. */
3735 return copy_rtx (desc
->mem
);
3737 /* Otherwise, create a new descriptor. */
3738 desc
= ggc_alloc
<constant_descriptor_rtx
> ();
3741 /* Align the location counter as required by EXP's data type. */
3742 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3743 #ifdef CONSTANT_ALIGNMENT
3745 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3746 if (type
!= NULL_TREE
)
3747 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3751 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3752 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3755 desc
->constant
= copy_rtx (tmp
.constant
);
3756 desc
->offset
= pool
->offset
;
3759 desc
->align
= align
;
3760 desc
->labelno
= const_labelno
;
3763 pool
->offset
+= GET_MODE_SIZE (mode
);
3765 pool
->last
->next
= desc
;
3767 pool
->first
= pool
->last
= desc
;
3770 /* Create a string containing the label name, in LABEL. */
3771 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3774 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3775 the constants pool. */
3776 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3778 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3779 symbol
= create_block_symbol (ggc_strdup (label
),
3780 get_block_for_section (sect
), -1);
3783 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3785 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3786 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3787 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3789 /* Construct the MEM. */
3790 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3791 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3792 set_mem_align (def
, align
);
3794 /* If we're dropping a label to the constant pool, make sure we
3796 if (GET_CODE (x
) == LABEL_REF
)
3797 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3799 return copy_rtx (def
);
3802 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3805 get_pool_constant (const_rtx addr
)
3807 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3810 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3811 and whether it has been output or not. */
3814 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3816 struct constant_descriptor_rtx
*desc
;
3818 desc
= SYMBOL_REF_CONSTANT (addr
);
3819 *pmarked
= (desc
->mark
!= 0);
3820 return desc
->constant
;
3823 /* Similar, return the mode. */
3826 get_pool_mode (const_rtx addr
)
3828 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3831 /* Return the size of the constant pool. */
3834 get_pool_size (void)
3836 return crtl
->varasm
.pool
->offset
;
3839 /* Worker function for output_constant_pool_1. Emit assembly for X
3840 in MODE with known alignment ALIGN. */
3843 output_constant_pool_2 (machine_mode mode
, rtx x
, unsigned int align
)
3845 switch (GET_MODE_CLASS (mode
))
3848 case MODE_DECIMAL_FLOAT
:
3852 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3853 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3854 assemble_real (r
, mode
, align
);
3859 case MODE_PARTIAL_INT
:
3864 case MODE_POINTER_BOUNDS
:
3865 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3868 case MODE_VECTOR_FLOAT
:
3869 case MODE_VECTOR_INT
:
3870 case MODE_VECTOR_FRACT
:
3871 case MODE_VECTOR_UFRACT
:
3872 case MODE_VECTOR_ACCUM
:
3873 case MODE_VECTOR_UACCUM
:
3876 machine_mode submode
= GET_MODE_INNER (mode
);
3877 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3879 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3880 units
= CONST_VECTOR_NUNITS (x
);
3882 for (i
= 0; i
< units
; i
++)
3884 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3885 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3895 /* Worker function for output_constant_pool. Emit constant DESC,
3896 giving it ALIGN bits of alignment. */
3899 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3906 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3907 whose CODE_LABEL has been deleted. This can occur if a jump table
3908 is eliminated by optimization. If so, write a constant of zero
3909 instead. Note that this can also happen by turning the
3910 CODE_LABEL into a NOTE. */
3911 /* ??? This seems completely and utterly wrong. Certainly it's
3912 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3913 functioning even with rtx_insn::deleted and friends. */
3916 switch (GET_CODE (tmp
))
3919 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3920 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3922 tmp
= XEXP (XEXP (tmp
, 0), 0);
3926 tmp
= LABEL_REF_LABEL (tmp
);
3927 gcc_assert (!as_a
<rtx_insn
*> (tmp
)->deleted ());
3928 gcc_assert (!NOTE_P (tmp
)
3929 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3936 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3937 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3938 align
, desc
->labelno
, done
);
3941 assemble_align (align
);
3943 /* Output the label. */
3944 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3946 /* Output the data. */
3947 output_constant_pool_2 (desc
->mode
, x
, align
);
3949 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3950 sections have proper size. */
3951 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3953 && (in_section
->common
.flags
& SECTION_MERGE
))
3954 assemble_align (align
);
3956 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3962 /* Mark all constants that are referenced by SYMBOL_REFs in X.
3963 Emit referenced deferred strings. */
3966 mark_constants_in_pattern (rtx insn
)
3968 subrtx_iterator::array_type array
;
3969 FOR_EACH_SUBRTX (iter
, array
, PATTERN (insn
), ALL
)
3971 const_rtx x
= *iter
;
3972 if (GET_CODE (x
) == SYMBOL_REF
)
3974 if (CONSTANT_POOL_ADDRESS_P (x
))
3976 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3977 if (desc
->mark
== 0)
3980 iter
.substitute (desc
->constant
);
3983 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3985 tree decl
= SYMBOL_REF_DECL (x
);
3986 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
3988 n_deferred_constants
--;
3989 output_constant_def_contents (CONST_CAST_RTX (x
));
3996 /* Look through appropriate parts of INSN, marking all entries in the
3997 constant pool which are actually being used. Entries that are only
3998 referenced by other constants are also marked as used. Emit
3999 deferred strings that are used. */
4002 mark_constants (rtx_insn
*insn
)
4007 /* Insns may appear inside a SEQUENCE. Only check the patterns of
4008 insns, not any notes that may be attached. We don't want to mark
4009 a constant just because it happens to appear in a REG_EQUIV note. */
4010 if (rtx_sequence
*seq
= dyn_cast
<rtx_sequence
*> (PATTERN (insn
)))
4012 int i
, n
= seq
->len ();
4013 for (i
= 0; i
< n
; ++i
)
4015 rtx subinsn
= seq
->element (i
);
4016 if (INSN_P (subinsn
))
4017 mark_constants_in_pattern (subinsn
);
4021 mark_constants_in_pattern (insn
);
4024 /* Look through the instructions for this function, and mark all the
4025 entries in POOL which are actually being used. Emit deferred constants
4026 which have indeed been used. */
4029 mark_constant_pool (void)
4033 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
4036 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
4037 mark_constants (insn
);
4040 /* Write all the constants in POOL. */
4043 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
4045 struct constant_descriptor_rtx
*desc
;
4047 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
4050 /* If the constant is part of an object_block, make sure that
4051 the constant has been positioned within its block, but do not
4052 write out its definition yet. output_object_blocks will do
4054 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
4055 && SYMBOL_REF_BLOCK (desc
->sym
))
4056 place_block_symbol (desc
->sym
);
4059 switch_to_section (targetm
.asm_out
.select_rtx_section
4060 (desc
->mode
, desc
->constant
, desc
->align
));
4061 output_constant_pool_1 (desc
, desc
->align
);
4066 /* Mark all constants that are used in the current function, then write
4067 out the function's private constant pool. */
4070 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
4071 tree fndecl ATTRIBUTE_UNUSED
)
4073 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
4075 /* It is possible for gcc to call force_const_mem and then to later
4076 discard the instructions which refer to the constant. In such a
4077 case we do not need to output the constant. */
4078 mark_constant_pool ();
4080 #ifdef ASM_OUTPUT_POOL_PROLOGUE
4081 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4084 output_constant_pool_contents (pool
);
4086 #ifdef ASM_OUTPUT_POOL_EPILOGUE
4087 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4091 /* Write the contents of the shared constant pool. */
4094 output_shared_constant_pool (void)
4096 output_constant_pool_contents (shared_constant_pool
);
4099 /* Determine what kind of relocations EXP may need. */
4102 compute_reloc_for_constant (tree exp
)
4104 int reloc
= 0, reloc2
;
4107 switch (TREE_CODE (exp
))
4111 /* Go inside any operations that get_inner_reference can handle and see
4112 if what's inside is a constant: no need to do anything here for
4113 addresses of variables or functions. */
4114 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4115 tem
= TREE_OPERAND (tem
, 0))
4118 if (TREE_CODE (tem
) == MEM_REF
4119 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
4121 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
4125 if (!targetm
.binds_local_p (tem
))
4132 case POINTER_PLUS_EXPR
:
4133 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4134 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4138 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4139 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4140 /* The difference of two local labels is computable at link time. */
4141 if (reloc
== 1 && reloc2
== 1)
4148 case VIEW_CONVERT_EXPR
:
4149 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4154 unsigned HOST_WIDE_INT idx
;
4155 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4157 reloc
|= compute_reloc_for_constant (tem
);
4167 /* Find all the constants whose addresses are referenced inside of EXP,
4168 and make sure assembler code with a label has been output for each one.
4169 Indicate whether an ADDR_EXPR has been encountered. */
4172 output_addressed_constants (tree exp
)
4176 switch (TREE_CODE (exp
))
4180 /* Go inside any operations that get_inner_reference can handle and see
4181 if what's inside is a constant: no need to do anything here for
4182 addresses of variables or functions. */
4183 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4184 tem
= TREE_OPERAND (tem
, 0))
4187 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4188 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4189 tem
= DECL_INITIAL (tem
);
4191 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4192 output_constant_def (tem
, 0);
4194 if (TREE_CODE (tem
) == MEM_REF
)
4195 output_addressed_constants (TREE_OPERAND (tem
, 0));
4199 case POINTER_PLUS_EXPR
:
4201 output_addressed_constants (TREE_OPERAND (exp
, 1));
4205 case VIEW_CONVERT_EXPR
:
4206 output_addressed_constants (TREE_OPERAND (exp
, 0));
4211 unsigned HOST_WIDE_INT idx
;
4212 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4214 output_addressed_constants (tem
);
4223 /* Whether a constructor CTOR is a valid static constant initializer if all
4224 its elements are. This used to be internal to initializer_constant_valid_p
4225 and has been exposed to let other functions like categorize_ctor_elements
4226 evaluate the property while walking a constructor for other purposes. */
4229 constructor_static_from_elts_p (const_tree ctor
)
4231 return (TREE_CONSTANT (ctor
)
4232 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4233 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4234 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4237 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4240 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4241 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4242 which are valid when ENDTYPE is an integer of any size; in
4243 particular, this does not accept a pointer minus a constant. This
4244 returns null_pointer_node if the VALUE is an absolute constant
4245 which can be used to initialize a static variable. Otherwise it
4249 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4253 if (!INTEGRAL_TYPE_P (endtype
))
4256 op0
= TREE_OPERAND (value
, 0);
4257 op1
= TREE_OPERAND (value
, 1);
4259 /* Like STRIP_NOPS except allow the operand mode to widen. This
4260 works around a feature of fold that simplifies (int)(p1 - p2) to
4261 ((int)p1 - (int)p2) under the theory that the narrower operation
4264 while (CONVERT_EXPR_P (op0
)
4265 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4267 tree inner
= TREE_OPERAND (op0
, 0);
4268 if (inner
== error_mark_node
4269 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4270 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4271 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4276 while (CONVERT_EXPR_P (op1
)
4277 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4279 tree inner
= TREE_OPERAND (op1
, 0);
4280 if (inner
== error_mark_node
4281 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4282 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4283 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4288 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4292 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4293 cache
? cache
+ 2 : NULL
);
4294 /* Both initializers must be known. */
4298 && (op0
== null_pointer_node
4299 || TREE_CODE (value
) == MINUS_EXPR
))
4300 return null_pointer_node
;
4302 /* Support differences between labels. */
4303 if (TREE_CODE (op0
) == LABEL_DECL
4304 && TREE_CODE (op1
) == LABEL_DECL
)
4305 return null_pointer_node
;
4307 if (TREE_CODE (op0
) == STRING_CST
4308 && TREE_CODE (op1
) == STRING_CST
4309 && operand_equal_p (op0
, op1
, 1))
4310 return null_pointer_node
;
4316 /* Helper function of initializer_constant_valid_p.
4317 Return nonzero if VALUE is a valid constant-valued expression
4318 for use in initializing a static variable; one that can be an
4319 element of a "constant" initializer.
4321 Return null_pointer_node if the value is absolute;
4322 if it is relocatable, return the variable that determines the relocation.
4323 We assume that VALUE has been folded as much as possible;
4324 therefore, we do not need to check for such things as
4325 arithmetic-combinations of integers.
4327 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4330 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4334 switch (TREE_CODE (value
))
4337 if (constructor_static_from_elts_p (value
))
4339 unsigned HOST_WIDE_INT idx
;
4341 bool absolute
= true;
4343 if (cache
&& cache
[0] == value
)
4345 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4348 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4355 cache
[1] = NULL_TREE
;
4359 if (reloc
!= null_pointer_node
)
4362 /* For a non-absolute relocation, there is no single
4363 variable that can be "the variable that determines the
4368 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4370 return absolute
? null_pointer_node
: error_mark_node
;
4373 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4381 return null_pointer_node
;
4386 tree op0
= staticp (TREE_OPERAND (value
, 0));
4389 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4390 to be a constant, this is old-skool offsetof-like nonsense. */
4391 if (TREE_CODE (op0
) == INDIRECT_REF
4392 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4393 return null_pointer_node
;
4394 /* Taking the address of a nested function involves a trampoline,
4395 unless we don't need or want one. */
4396 if (TREE_CODE (op0
) == FUNCTION_DECL
4397 && DECL_STATIC_CHAIN (op0
)
4398 && !TREE_NO_TRAMPOLINE (value
))
4400 /* "&{...}" requires a temporary to hold the constructed
4402 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4408 case NON_LVALUE_EXPR
:
4409 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4412 case VIEW_CONVERT_EXPR
:
4414 tree src
= TREE_OPERAND (value
, 0);
4415 tree src_type
= TREE_TYPE (src
);
4416 tree dest_type
= TREE_TYPE (value
);
4418 /* Allow view-conversions from aggregate to non-aggregate type only
4419 if the bit pattern is fully preserved afterwards; otherwise, the
4420 RTL expander won't be able to apply a subsequent transformation
4421 to the underlying constructor. */
4422 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4424 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4425 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4430 /* Allow all other kinds of view-conversion. */
4431 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4436 tree src
= TREE_OPERAND (value
, 0);
4437 tree src_type
= TREE_TYPE (src
);
4438 tree dest_type
= TREE_TYPE (value
);
4440 /* Allow conversions between pointer types, floating-point
4441 types, and offset types. */
4442 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4443 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4444 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4445 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4446 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4448 /* Allow length-preserving conversions between integer types. */
4449 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4450 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4451 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4453 /* Allow conversions between other integer types only if
4455 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4457 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4458 if (inner
== null_pointer_node
)
4459 return null_pointer_node
;
4463 /* Allow (int) &foo provided int is as wide as a pointer. */
4464 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4465 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4466 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4468 /* Likewise conversions from int to pointers, but also allow
4469 conversions from 0. */
4470 if ((POINTER_TYPE_P (dest_type
)
4471 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4472 && INTEGRAL_TYPE_P (src_type
))
4474 if (TREE_CODE (src
) == INTEGER_CST
4475 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4476 return null_pointer_node
;
4477 if (integer_zerop (src
))
4478 return null_pointer_node
;
4479 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4480 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4483 /* Allow conversions to struct or union types if the value
4485 if (TREE_CODE (dest_type
) == RECORD_TYPE
4486 || TREE_CODE (dest_type
) == UNION_TYPE
)
4487 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4491 case POINTER_PLUS_EXPR
:
4493 /* Any valid floating-point constants will have been folded by now;
4494 with -frounding-math we hit this with addition of two constants. */
4495 if (TREE_CODE (endtype
) == REAL_TYPE
)
4497 if (cache
&& cache
[0] == value
)
4499 if (! INTEGRAL_TYPE_P (endtype
)
4500 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4502 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4504 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4507 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4508 endtype
, ncache
+ 2);
4509 /* If either term is absolute, use the other term's relocation. */
4510 if (valid0
== null_pointer_node
)
4512 else if (valid1
== null_pointer_node
)
4514 /* Support narrowing pointer differences. */
4516 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4520 /* Support narrowing pointer differences. */
4521 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4530 if (TREE_CODE (endtype
) == REAL_TYPE
)
4532 if (cache
&& cache
[0] == value
)
4534 if (! INTEGRAL_TYPE_P (endtype
)
4535 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4537 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4539 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4542 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4543 endtype
, ncache
+ 2);
4544 /* Win if second argument is absolute. */
4545 if (valid1
== null_pointer_node
)
4547 /* Win if both arguments have the same relocation.
4548 Then the value is absolute. */
4549 else if (valid0
== valid1
&& valid0
!= 0)
4550 ret
= null_pointer_node
;
4551 /* Since GCC guarantees that string constants are unique in the
4552 generated code, a subtraction between two copies of the same
4553 constant string is absolute. */
4554 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4555 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4556 && operand_equal_p (valid0
, valid1
, 1))
4557 ret
= null_pointer_node
;
4558 /* Support narrowing differences. */
4560 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4564 /* Support narrowing differences. */
4565 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4580 /* Return nonzero if VALUE is a valid constant-valued expression
4581 for use in initializing a static variable; one that can be an
4582 element of a "constant" initializer.
4584 Return null_pointer_node if the value is absolute;
4585 if it is relocatable, return the variable that determines the relocation.
4586 We assume that VALUE has been folded as much as possible;
4587 therefore, we do not need to check for such things as
4588 arithmetic-combinations of integers. */
4590 initializer_constant_valid_p (tree value
, tree endtype
)
4592 return initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4595 /* Return true if VALUE is a valid constant-valued expression
4596 for use in initializing a static bit-field; one that can be
4597 an element of a "constant" initializer. */
4600 initializer_constant_valid_for_bitfield_p (tree value
)
4602 /* For bitfields we support integer constants or possibly nested aggregates
4604 switch (TREE_CODE (value
))
4608 unsigned HOST_WIDE_INT idx
;
4611 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4612 if (!initializer_constant_valid_for_bitfield_p (elt
))
4621 case VIEW_CONVERT_EXPR
:
4622 case NON_LVALUE_EXPR
:
4624 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4633 /* output_constructor outer state of relevance in recursive calls, typically
4634 for nested aggregate bitfields. */
4637 unsigned int bit_offset
; /* current position in ... */
4638 int byte
; /* ... the outer byte buffer. */
4641 static unsigned HOST_WIDE_INT
4642 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int,
4645 /* Output assembler code for constant EXP, with no label.
4646 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4647 Assumes output_addressed_constants has been done on EXP already.
4649 Generate at least SIZE bytes of assembler data, padding at the end
4650 with zeros if necessary. SIZE must always be specified. The returned
4651 value is the actual number of bytes of assembler data generated, which
4652 may be bigger than SIZE if the object contains a variable length field.
4654 SIZE is important for structure constructors,
4655 since trailing members may have been omitted from the constructor.
4656 It is also important for initialization of arrays from string constants
4657 since the full length of the string constant might not be wanted.
4658 It is also needed for initialization of unions, where the initializer's
4659 type is just one member, and that may not be as long as the union.
4661 There a case in which we would fail to output exactly SIZE bytes:
4662 for a structure constructor that wants to produce more than SIZE bytes.
4663 But such constructors will never be generated for any possible input.
4665 ALIGN is the alignment of the data in bits. */
4667 static unsigned HOST_WIDE_INT
4668 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4670 enum tree_code code
;
4671 unsigned HOST_WIDE_INT thissize
;
4673 if (size
== 0 || flag_syntax_only
)
4676 /* See if we're trying to initialize a pointer in a non-default mode
4677 to the address of some declaration somewhere. If the target says
4678 the mode is valid for pointers, assume the target has a way of
4680 if (TREE_CODE (exp
) == NOP_EXPR
4681 && POINTER_TYPE_P (TREE_TYPE (exp
))
4682 && targetm
.addr_space
.valid_pointer_mode
4683 (TYPE_MODE (TREE_TYPE (exp
)),
4684 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4686 tree saved_type
= TREE_TYPE (exp
);
4688 /* Peel off any intermediate conversions-to-pointer for valid
4690 while (TREE_CODE (exp
) == NOP_EXPR
4691 && POINTER_TYPE_P (TREE_TYPE (exp
))
4692 && targetm
.addr_space
.valid_pointer_mode
4693 (TYPE_MODE (TREE_TYPE (exp
)),
4694 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4695 exp
= TREE_OPERAND (exp
, 0);
4697 /* If what we're left with is the address of something, we can
4698 convert the address to the final type and output it that
4700 if (TREE_CODE (exp
) == ADDR_EXPR
)
4701 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4702 /* Likewise for constant ints. */
4703 else if (TREE_CODE (exp
) == INTEGER_CST
)
4704 exp
= wide_int_to_tree (saved_type
, exp
);
4708 /* Eliminate any conversions since we'll be outputting the underlying
4710 while (CONVERT_EXPR_P (exp
)
4711 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4712 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4714 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4715 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4717 /* Make sure eliminating the conversion is really a no-op, except with
4718 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4719 union types to allow for Ada unchecked unions. */
4720 if (type_size
> op_size
4721 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4722 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4723 /* Keep the conversion. */
4726 exp
= TREE_OPERAND (exp
, 0);
4729 code
= TREE_CODE (TREE_TYPE (exp
));
4730 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4732 /* Allow a constructor with no elements for any data type.
4733 This means to fill the space with zeros. */
4734 if (TREE_CODE (exp
) == CONSTRUCTOR
4735 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4737 assemble_zeros (size
);
4741 if (TREE_CODE (exp
) == FDESC_EXPR
)
4743 #ifdef ASM_OUTPUT_FDESC
4744 HOST_WIDE_INT part
= tree_to_shwi (TREE_OPERAND (exp
, 1));
4745 tree decl
= TREE_OPERAND (exp
, 0);
4746 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4753 /* Now output the underlying data. If we've handling the padding, return.
4754 Otherwise, break and ensure SIZE is the size written. */
4761 case REFERENCE_TYPE
:
4763 case FIXED_POINT_TYPE
:
4764 case POINTER_BOUNDS_TYPE
:
4766 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4767 EXPAND_INITIALIZER
),
4768 MIN (size
, thissize
), align
, 0))
4769 error ("initializer for integer/fixed-point value is too complicated");
4773 if (TREE_CODE (exp
) != REAL_CST
)
4774 error ("initializer for floating value is not a floating constant");
4776 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4780 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4781 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4782 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4787 switch (TREE_CODE (exp
))
4790 return output_constructor (exp
, size
, align
, NULL
);
4793 = MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
), size
);
4794 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4798 machine_mode inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4799 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4800 int elt_size
= GET_MODE_SIZE (inner
);
4801 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
);
4802 thissize
= elt_size
;
4803 for (unsigned int i
= 1; i
< VECTOR_CST_NELTS (exp
); i
++)
4805 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
);
4806 thissize
+= elt_size
;
4817 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4818 return output_constructor (exp
, size
, align
, NULL
);
4827 if (size
> thissize
)
4828 assemble_zeros (size
- thissize
);
4834 /* Subroutine of output_constructor, used for computing the size of
4835 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4836 type with an unspecified upper bound. */
4838 static unsigned HOST_WIDE_INT
4839 array_size_for_constructor (tree val
)
4842 unsigned HOST_WIDE_INT cnt
;
4843 tree index
, value
, tmp
;
4846 /* This code used to attempt to handle string constants that are not
4847 arrays of single-bytes, but nothing else does, so there's no point in
4849 if (TREE_CODE (val
) == STRING_CST
)
4850 return TREE_STRING_LENGTH (val
);
4852 max_index
= NULL_TREE
;
4853 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4855 if (TREE_CODE (index
) == RANGE_EXPR
)
4856 index
= TREE_OPERAND (index
, 1);
4857 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4861 if (max_index
== NULL_TREE
)
4864 /* Compute the total number of array elements. */
4865 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4866 i
= wi::to_offset (max_index
) - wi::to_offset (tmp
) + 1;
4868 /* Multiply by the array element unit size to find number of bytes. */
4869 i
*= wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4871 gcc_assert (wi::fits_uhwi_p (i
));
4872 return i
.to_uhwi ();
4875 /* Other datastructures + helpers for output_constructor. */
4877 /* output_constructor local state to support interaction with helpers. */
4881 /* Received arguments. */
4882 tree exp
; /* Constructor expression. */
4883 tree type
; /* Type of constructor expression. */
4884 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4885 unsigned int align
; /* Known initial alignment. */
4886 tree min_index
; /* Lower bound if specified for an array. */
4888 /* Output processing state. */
4889 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4890 int byte
; /* Part of a bitfield byte yet to be output. */
4891 int last_relative_index
; /* Implicit or explicit index of the last
4892 array element output within a bitfield. */
4893 bool byte_buffer_in_use
; /* Whether BYTE is in use. */
4895 /* Current element. */
4896 tree field
; /* Current field decl in a record. */
4897 tree val
; /* Current element value. */
4898 tree index
; /* Current element index. */
4902 /* Helper for output_constructor. From the current LOCAL state, output a
4903 RANGE_EXPR element. */
4906 output_constructor_array_range (oc_local_state
*local
)
4908 unsigned HOST_WIDE_INT fieldsize
4909 = int_size_in_bytes (TREE_TYPE (local
->type
));
4911 HOST_WIDE_INT lo_index
4912 = tree_to_shwi (TREE_OPERAND (local
->index
, 0));
4913 HOST_WIDE_INT hi_index
4914 = tree_to_shwi (TREE_OPERAND (local
->index
, 1));
4915 HOST_WIDE_INT index
;
4918 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4920 for (index
= lo_index
; index
<= hi_index
; index
++)
4922 /* Output the element's initial value. */
4923 if (local
->val
== NULL_TREE
)
4924 assemble_zeros (fieldsize
);
4926 fieldsize
= output_constant (local
->val
, fieldsize
, align2
);
4928 /* Count its size. */
4929 local
->total_bytes
+= fieldsize
;
4933 /* Helper for output_constructor. From the current LOCAL state, output a
4934 field element that is not true bitfield or part of an outer one. */
4937 output_constructor_regular_field (oc_local_state
*local
)
4939 /* Field size and position. Since this structure is static, we know the
4940 positions are constant. */
4941 unsigned HOST_WIDE_INT fieldsize
;
4942 HOST_WIDE_INT fieldpos
;
4944 unsigned int align2
;
4946 if (local
->index
!= NULL_TREE
)
4948 /* Perform the index calculation in modulo arithmetic but
4949 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4950 but we are using an unsigned sizetype. */
4951 unsigned prec
= TYPE_PRECISION (sizetype
);
4952 offset_int idx
= wi::sext (wi::to_offset (local
->index
)
4953 - wi::to_offset (local
->min_index
), prec
);
4954 fieldpos
= (idx
* wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
))))
4957 else if (local
->field
!= NULL_TREE
)
4958 fieldpos
= int_byte_position (local
->field
);
4962 /* Output any buffered-up bit-fields preceding this element. */
4963 if (local
->byte_buffer_in_use
)
4965 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4966 local
->total_bytes
++;
4967 local
->byte_buffer_in_use
= false;
4970 /* Advance to offset of this element.
4971 Note no alignment needed in an array, since that is guaranteed
4972 if each element has the proper size. */
4973 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4974 && fieldpos
> local
->total_bytes
)
4976 assemble_zeros (fieldpos
- local
->total_bytes
);
4977 local
->total_bytes
= fieldpos
;
4980 /* Find the alignment of this element. */
4981 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
4983 /* Determine size this element should occupy. */
4988 /* If this is an array with an unspecified upper bound,
4989 the initializer determines the size. */
4990 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4991 but we cannot do this until the deprecated support for
4992 initializing zero-length array members is removed. */
4993 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
4994 && TYPE_DOMAIN (TREE_TYPE (local
->field
))
4995 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
))))
4997 fieldsize
= array_size_for_constructor (local
->val
);
4998 /* Given a non-empty initialization, this field had
5000 gcc_assert (!fieldsize
|| !DECL_CHAIN (local
->field
));
5003 fieldsize
= tree_to_uhwi (DECL_SIZE_UNIT (local
->field
));
5006 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
5008 /* Output the element's initial value. */
5009 if (local
->val
== NULL_TREE
)
5010 assemble_zeros (fieldsize
);
5012 fieldsize
= output_constant (local
->val
, fieldsize
, align2
);
5014 /* Count its size. */
5015 local
->total_bytes
+= fieldsize
;
5018 /* Helper for output_constructor. From the LOCAL state, output an element
5019 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
5020 from the start of a possibly ongoing outer byte buffer. */
5023 output_constructor_bitfield (oc_local_state
*local
, unsigned int bit_offset
)
5025 /* Bit size of this element. */
5026 HOST_WIDE_INT ebitsize
5028 ? tree_to_uhwi (DECL_SIZE (local
->field
))
5029 : tree_to_uhwi (TYPE_SIZE (TREE_TYPE (local
->type
))));
5031 /* Relative index of this element if this is an array component. */
5032 HOST_WIDE_INT relative_index
5035 ? (tree_to_shwi (local
->index
)
5036 - tree_to_shwi (local
->min_index
))
5037 : local
->last_relative_index
+ 1)
5040 /* Bit position of this element from the start of the containing
5042 HOST_WIDE_INT constructor_relative_ebitpos
5044 ? int_bit_position (local
->field
)
5045 : ebitsize
* relative_index
);
5047 /* Bit position of this element from the start of a possibly ongoing
5048 outer byte buffer. */
5049 HOST_WIDE_INT byte_relative_ebitpos
5050 = bit_offset
+ constructor_relative_ebitpos
;
5052 /* From the start of a possibly ongoing outer byte buffer, offsets to
5053 the first bit of this element and to the first bit past the end of
5055 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
5056 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
5058 local
->last_relative_index
= relative_index
;
5060 if (local
->val
== NULL_TREE
)
5061 local
->val
= integer_zero_node
;
5063 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
5064 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
5065 local
->val
= TREE_OPERAND (local
->val
, 0);
5067 if (TREE_CODE (local
->val
) != INTEGER_CST
5068 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
5070 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
5074 /* If this field does not start in this (or next) byte, skip some bytes. */
5075 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5077 /* Output remnant of any bit field in previous bytes. */
5078 if (local
->byte_buffer_in_use
)
5080 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5081 local
->total_bytes
++;
5082 local
->byte_buffer_in_use
= false;
5085 /* If still not at proper byte, advance to there. */
5086 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5088 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
5089 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
5090 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
5094 /* Set up the buffer if necessary. */
5095 if (!local
->byte_buffer_in_use
)
5099 local
->byte_buffer_in_use
= true;
5102 /* If this is nested constructor, recurse passing the bit offset and the
5103 pending data, then retrieve the new pending data afterwards. */
5104 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
5106 oc_outer_state temp_state
;
5107 temp_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
5108 temp_state
.byte
= local
->byte
;
5110 += output_constructor (local
->val
, 0, 0, &temp_state
);
5111 local
->byte
= temp_state
.byte
;
5115 /* Otherwise, we must split the element into pieces that fall within
5116 separate bytes, and combine each byte with previous or following
5118 while (next_offset
< end_offset
)
5122 HOST_WIDE_INT value
;
5123 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
5124 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
5126 /* Advance from byte to byte within this element when necessary. */
5127 while (next_byte
!= local
->total_bytes
)
5129 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5130 local
->total_bytes
++;
5134 /* Number of bits we can process at once (all part of the same byte). */
5135 this_time
= MIN (end_offset
- next_offset
, BITS_PER_UNIT
- next_bit
);
5136 if (BYTES_BIG_ENDIAN
)
5138 /* On big-endian machine, take the most significant bits (of the
5139 bits that are significant) first and put them into bytes from
5140 the most significant end. */
5141 shift
= end_offset
- next_offset
- this_time
;
5143 /* Don't try to take a bunch of bits that cross
5144 the word boundary in the INTEGER_CST. We can
5145 only select bits from one element. */
5146 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5147 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5149 const int end
= shift
+ this_time
- 1;
5150 shift
= end
& -HOST_BITS_PER_WIDE_INT
;
5151 this_time
= end
- shift
+ 1;
5154 /* Now get the bits from the appropriate constant word. */
5155 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5156 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5158 /* Get the result. This works only when:
5159 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5160 local
->byte
|= (((value
>> shift
)
5161 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5162 << (BITS_PER_UNIT
- this_time
- next_bit
));
5166 /* On little-endian machines, take the least significant bits of
5167 the value first and pack them starting at the least significant
5168 bits of the bytes. */
5169 shift
= next_offset
- byte_relative_ebitpos
;
5171 /* Don't try to take a bunch of bits that cross
5172 the word boundary in the INTEGER_CST. We can
5173 only select bits from one element. */
5174 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5175 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5177 = HOST_BITS_PER_WIDE_INT
- (shift
& (HOST_BITS_PER_WIDE_INT
- 1));
5179 /* Now get the bits from the appropriate constant word. */
5180 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5181 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5183 /* Get the result. This works only when:
5184 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5185 local
->byte
|= (((value
>> shift
)
5186 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5190 next_offset
+= this_time
;
5191 local
->byte_buffer_in_use
= true;
5195 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5196 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5197 caller output state of relevance in recursive invocations. */
5199 static unsigned HOST_WIDE_INT
5200 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
5201 unsigned int align
, oc_outer_state
*outer
)
5203 unsigned HOST_WIDE_INT cnt
;
5204 constructor_elt
*ce
;
5206 oc_local_state local
;
5208 /* Setup our local state to communicate with helpers. */
5210 local
.type
= TREE_TYPE (exp
);
5212 local
.align
= align
;
5213 if (TREE_CODE (local
.type
) == ARRAY_TYPE
&& TYPE_DOMAIN (local
.type
))
5214 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5216 local
.min_index
= NULL_TREE
;
5218 local
.total_bytes
= 0;
5219 local
.byte_buffer_in_use
= outer
!= NULL
;
5220 local
.byte
= outer
? outer
->byte
: 0;
5221 local
.last_relative_index
= -1;
5223 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5225 /* As CE goes through the elements of the constant, FIELD goes through the
5226 structure fields if the constant is a structure. If the constant is a
5227 union, we override this by getting the field from the TREE_LIST element.
5228 But the constant could also be an array. Then FIELD is zero.
5230 There is always a maximum of one element in the chain LINK for unions
5231 (even if the initializer in a source program incorrectly contains
5234 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5235 local
.field
= TYPE_FIELDS (local
.type
);
5237 local
.field
= NULL_TREE
;
5240 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5241 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5243 local
.val
= ce
->value
;
5244 local
.index
= NULL_TREE
;
5246 /* The element in a union constructor specifies the proper field
5248 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5249 local
.field
= ce
->index
;
5251 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5252 local
.index
= ce
->index
;
5254 if (local
.field
&& flag_verbose_asm
)
5255 fprintf (asm_out_file
, "%s %s:\n",
5257 DECL_NAME (local
.field
)
5258 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5261 /* Eliminate the marker that makes a cast not be an lvalue. */
5262 if (local
.val
!= NULL_TREE
)
5263 STRIP_NOPS (local
.val
);
5265 /* Output the current element, using the appropriate helper ... */
5267 /* For an array slice not part of an outer bitfield. */
5269 && local
.index
!= NULL_TREE
5270 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5271 output_constructor_array_range (&local
);
5273 /* For a field that is neither a true bitfield nor part of an outer one,
5274 known to be at least byte aligned and multiple-of-bytes long. */
5276 && (local
.field
== NULL_TREE
5277 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5278 output_constructor_regular_field (&local
);
5280 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5281 supported for scalar fields, so we may need to convert first. */
5284 if (TREE_CODE (local
.val
) == REAL_CST
)
5286 = fold_unary (VIEW_CONVERT_EXPR
,
5287 build_nonstandard_integer_type
5288 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5290 output_constructor_bitfield (&local
, outer
? outer
->bit_offset
: 0);
5294 /* If we are not at toplevel, save the pending data for our caller.
5295 Otherwise output the pending data and padding zeros as needed. */
5297 outer
->byte
= local
.byte
;
5300 if (local
.byte_buffer_in_use
)
5302 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5303 local
.total_bytes
++;
5306 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5308 assemble_zeros (local
.size
- local
.total_bytes
);
5309 local
.total_bytes
= local
.size
;
5313 return local
.total_bytes
;
5316 /* Mark DECL as weak. */
5319 mark_weak (tree decl
)
5321 if (DECL_WEAK (decl
))
5324 struct symtab_node
*n
= symtab_node::get (decl
);
5325 if (n
&& n
->refuse_visibility_changes
)
5326 error ("%+D declared weak after being used", decl
);
5327 DECL_WEAK (decl
) = 1;
5329 if (DECL_RTL_SET_P (decl
)
5330 && MEM_P (DECL_RTL (decl
))
5331 && XEXP (DECL_RTL (decl
), 0)
5332 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5333 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5336 /* Merge weak status between NEWDECL and OLDDECL. */
5339 merge_weak (tree newdecl
, tree olddecl
)
5341 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5343 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5346 /* We put the NEWDECL on the weak_decls list at some point
5347 and OLDDECL as well. Keep just OLDDECL on the list. */
5348 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5349 if (TREE_VALUE (*pwd
) == newdecl
)
5351 *pwd
= TREE_CHAIN (*pwd
);
5358 if (DECL_WEAK (newdecl
))
5362 /* NEWDECL is weak, but OLDDECL is not. */
5364 /* If we already output the OLDDECL, we're in trouble; we can't
5365 go back and make it weak. This should never happen in
5366 unit-at-a-time compilation. */
5367 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5369 /* If we've already generated rtl referencing OLDDECL, we may
5370 have done so in a way that will not function properly with
5371 a weak symbol. Again in unit-at-a-time this should be
5373 gcc_assert (!TREE_USED (olddecl
)
5374 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5376 if (TARGET_SUPPORTS_WEAK
)
5378 /* We put the NEWDECL on the weak_decls list at some point.
5379 Replace it with the OLDDECL. */
5380 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5381 if (TREE_VALUE (wd
) == newdecl
)
5383 TREE_VALUE (wd
) = olddecl
;
5386 /* We may not find the entry on the list. If NEWDECL is a
5387 weak alias, then we will have already called
5388 globalize_decl to remove the entry; in that case, we do
5389 not need to do anything. */
5392 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5393 mark_weak (olddecl
);
5396 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5397 weak. Just update NEWDECL to indicate that it's weak too. */
5398 mark_weak (newdecl
);
5401 /* Declare DECL to be a weak symbol. */
5404 declare_weak (tree decl
)
5406 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5407 if (! TREE_PUBLIC (decl
))
5408 error ("weak declaration of %q+D must be public", decl
);
5409 else if (!TARGET_SUPPORTS_WEAK
)
5410 warning (0, "weak declaration of %q+D not supported", decl
);
5413 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5414 DECL_ATTRIBUTES (decl
)
5415 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5419 weak_finish_1 (tree decl
)
5421 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5422 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5425 if (! TREE_USED (decl
))
5428 #ifdef ASM_WEAKEN_DECL
5429 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5431 #ifdef ASM_WEAKEN_LABEL
5432 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5434 #ifdef ASM_OUTPUT_WEAK_ALIAS
5436 static bool warn_once
= 0;
5439 warning (0, "only weak aliases are supported in this configuration");
5449 /* Fiven an assembly name, find the decl it is associated with. */
5451 find_decl (tree target
)
5453 symtab_node
*node
= symtab_node::get_for_asmname (target
);
5459 /* This TREE_LIST contains weakref targets. */
5461 static GTY(()) tree weakref_targets
;
5463 /* Emit any pending weak declarations. */
5470 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5472 tree alias_decl
= TREE_PURPOSE (t
);
5473 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5475 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5476 /* Remove alias_decl from the weak list, but leave entries for
5477 the target alone. */
5479 #ifndef ASM_OUTPUT_WEAKREF
5480 else if (! TREE_SYMBOL_REFERENCED (target
))
5482 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5483 defined, otherwise we and weak_finish_1 would use
5484 different macros. */
5485 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5486 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5488 tree decl
= find_decl (target
);
5492 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5493 TREE_CODE (alias_decl
), target
,
5494 TREE_TYPE (alias_decl
));
5496 DECL_EXTERNAL (decl
) = 1;
5497 TREE_PUBLIC (decl
) = 1;
5498 DECL_ARTIFICIAL (decl
) = 1;
5499 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5500 TREE_USED (decl
) = 1;
5503 weak_finish_1 (decl
);
5512 /* Remove the alias and the target from the pending weak list
5513 so that we do not emit any .weak directives for the former,
5514 nor multiple .weak directives for the latter. */
5515 for (p
= &weak_decls
; (t2
= *p
) ; )
5517 if (TREE_VALUE (t2
) == alias_decl
5518 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5519 *p
= TREE_CHAIN (t2
);
5521 p
= &TREE_CHAIN (t2
);
5524 /* Remove other weakrefs to the same target, to speed things up. */
5525 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5527 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5528 *p
= TREE_CHAIN (t2
);
5530 p
= &TREE_CHAIN (t2
);
5535 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5537 tree decl
= TREE_VALUE (t
);
5539 weak_finish_1 (decl
);
5543 /* Emit the assembly bits to indicate that DECL is globally visible. */
5546 globalize_decl (tree decl
)
5549 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5550 if (DECL_WEAK (decl
))
5552 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5555 #ifdef ASM_WEAKEN_DECL
5556 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5558 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5561 /* Remove this function from the pending weak list so that
5562 we do not emit multiple .weak directives for it. */
5563 for (p
= &weak_decls
; (t
= *p
) ; )
5565 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5566 *p
= TREE_CHAIN (t
);
5568 p
= &TREE_CHAIN (t
);
5571 /* Remove weakrefs to the same target from the pending weakref
5572 list, for the same reason. */
5573 for (p
= &weakref_targets
; (t
= *p
) ; )
5575 if (DECL_ASSEMBLER_NAME (decl
)
5576 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5577 *p
= TREE_CHAIN (t
);
5579 p
= &TREE_CHAIN (t
);
5586 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5589 vec
<alias_pair
, va_gc
> *alias_pairs
;
5591 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5592 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5593 tree node is DECL to have the value of the tree node TARGET. */
5596 do_assemble_alias (tree decl
, tree target
)
5600 /* Emulated TLS had better not get this var. */
5601 gcc_assert (!(!targetm
.have_tls
5602 && TREE_CODE (decl
) == VAR_DECL
5603 && DECL_THREAD_LOCAL_P (decl
)));
5605 if (TREE_ASM_WRITTEN (decl
))
5608 id
= DECL_ASSEMBLER_NAME (decl
);
5609 ultimate_transparent_alias_target (&id
);
5610 ultimate_transparent_alias_target (&target
);
5612 /* We must force creation of DECL_RTL for debug info generation, even though
5613 we don't use it here. */
5614 make_decl_rtl (decl
);
5616 TREE_ASM_WRITTEN (decl
) = 1;
5617 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5618 TREE_ASM_WRITTEN (id
) = 1;
5620 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5622 if (!TREE_SYMBOL_REFERENCED (target
))
5623 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5625 #ifdef ASM_OUTPUT_WEAKREF
5626 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5627 IDENTIFIER_POINTER (id
),
5628 IDENTIFIER_POINTER (target
));
5630 if (!TARGET_SUPPORTS_WEAK
)
5632 error_at (DECL_SOURCE_LOCATION (decl
),
5633 "weakref is not supported in this configuration");
5640 #ifdef ASM_OUTPUT_DEF
5641 tree orig_decl
= decl
;
5643 if (TREE_CODE (decl
) == FUNCTION_DECL
5644 && cgraph_node::get (decl
)->instrumentation_clone
5645 && cgraph_node::get (decl
)->instrumented_version
)
5646 orig_decl
= cgraph_node::get (decl
)->instrumented_version
->decl
;
5648 /* Make name accessible from other files, if appropriate. */
5650 if (TREE_PUBLIC (decl
) || TREE_PUBLIC (orig_decl
))
5652 globalize_decl (decl
);
5653 maybe_assemble_visibility (decl
);
5655 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5657 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5658 if (targetm
.has_ifunc_p ())
5659 ASM_OUTPUT_TYPE_DIRECTIVE
5660 (asm_out_file
, IDENTIFIER_POINTER (id
),
5664 error_at (DECL_SOURCE_LOCATION (decl
),
5665 "ifunc is not supported on this target");
5668 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5669 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5671 ASM_OUTPUT_DEF (asm_out_file
,
5672 IDENTIFIER_POINTER (id
),
5673 IDENTIFIER_POINTER (target
));
5675 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5680 name
= IDENTIFIER_POINTER (id
);
5681 # ifdef ASM_WEAKEN_DECL
5682 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5684 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5686 /* Remove this function from the pending weak list so that
5687 we do not emit multiple .weak directives for it. */
5688 for (p
= &weak_decls
; (t
= *p
) ; )
5689 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
))
5690 || id
== DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5691 *p
= TREE_CHAIN (t
);
5693 p
= &TREE_CHAIN (t
);
5695 /* Remove weakrefs to the same target from the pending weakref
5696 list, for the same reason. */
5697 for (p
= &weakref_targets
; (t
= *p
) ; )
5699 if (id
== ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5700 *p
= TREE_CHAIN (t
);
5702 p
= &TREE_CHAIN (t
);
5708 /* Emit an assembler directive to make the symbol for DECL an alias to
5709 the symbol for TARGET. */
5712 assemble_alias (tree decl
, tree target
)
5716 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5718 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5720 ultimate_transparent_alias_target (&target
);
5722 if (alias
== target
)
5723 error ("weakref %q+D ultimately targets itself", decl
);
5724 if (TREE_PUBLIC (decl
))
5725 error ("weakref %q+D must have static linkage", decl
);
5729 #if !defined (ASM_OUTPUT_DEF)
5730 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5731 error_at (DECL_SOURCE_LOCATION (decl
),
5732 "alias definitions not supported in this configuration");
5733 TREE_ASM_WRITTEN (decl
) = 1;
5736 if (!DECL_WEAK (decl
))
5738 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5739 error_at (DECL_SOURCE_LOCATION (decl
),
5740 "ifunc is not supported in this configuration");
5742 error_at (DECL_SOURCE_LOCATION (decl
),
5743 "only weak aliases are supported in this configuration");
5744 TREE_ASM_WRITTEN (decl
) = 1;
5750 TREE_USED (decl
) = 1;
5752 /* Allow aliases to aliases. */
5753 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5754 cgraph_node::get_create (decl
)->alias
= true;
5756 varpool_node::get_create (decl
)->alias
= true;
5758 /* If the target has already been emitted, we don't have to queue the
5759 alias. This saves a tad of memory. */
5760 if (symtab
->global_info_ready
)
5761 target_decl
= find_decl (target
);
5764 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5765 || symtab
->state
>= EXPANSION
)
5766 do_assemble_alias (decl
, target
);
5769 alias_pair p
= {decl
, target
};
5770 vec_safe_push (alias_pairs
, p
);
5774 /* Record and output a table of translations from original function
5775 to its transaction aware clone. Note that tm_pure functions are
5776 considered to be their own clone. */
5778 struct tm_clone_hasher
: ggc_cache_hasher
<tree_map
*>
5780 static hashval_t
hash (tree_map
*m
) { return tree_map_hash (m
); }
5781 static bool equal (tree_map
*a
, tree_map
*b
) { return tree_map_eq (a
, b
); }
5783 static void handle_cache_entry (tree_map
*&e
)
5785 if (e
!= HTAB_EMPTY_ENTRY
|| e
!= HTAB_DELETED_ENTRY
)
5787 extern void gt_ggc_mx (tree_map
*&);
5788 if (ggc_marked_p (e
->base
.from
))
5791 e
= static_cast<tree_map
*> (HTAB_DELETED_ENTRY
);
5797 hash_table
<tm_clone_hasher
> *tm_clone_hash
;
5800 record_tm_clone_pair (tree o
, tree n
)
5802 struct tree_map
**slot
, *h
;
5804 if (tm_clone_hash
== NULL
)
5805 tm_clone_hash
= hash_table
<tm_clone_hasher
>::create_ggc (32);
5807 h
= ggc_alloc
<tree_map
> ();
5808 h
->hash
= htab_hash_pointer (o
);
5812 slot
= tm_clone_hash
->find_slot_with_hash (h
, h
->hash
, INSERT
);
5817 get_tm_clone_pair (tree o
)
5821 struct tree_map
*h
, in
;
5824 in
.hash
= htab_hash_pointer (o
);
5825 h
= tm_clone_hash
->find_with_hash (&in
, in
.hash
);
5832 typedef struct tm_alias_pair
5840 /* Dump the actual pairs to the .tm_clone_table section. */
5843 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5847 bool switched
= false;
5849 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5853 struct cgraph_node
*src_n
= cgraph_node::get (src
);
5854 struct cgraph_node
*dst_n
= cgraph_node::get (dst
);
5856 /* The function ipa_tm_create_version() marks the clone as needed if
5857 the original function was needed. But we also mark the clone as
5858 needed if we ever called the clone indirectly through
5859 TM_GETTMCLONE. If neither of these are true, we didn't generate
5860 a clone, and we didn't call it indirectly... no sense keeping it
5861 in the clone table. */
5862 if (!dst_n
|| !dst_n
->definition
)
5865 /* This covers the case where we have optimized the original
5866 function away, and only access the transactional clone. */
5867 if (!src_n
|| !src_n
->definition
)
5872 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5873 assemble_align (POINTER_SIZE
);
5877 assemble_integer (XEXP (DECL_RTL (src
), 0),
5878 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
5879 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5880 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
5884 /* Provide a default for the tm_clone_table section. */
5887 default_clone_table_section (void)
5889 return get_named_section (NULL
, ".tm_clone_table", 3);
5892 /* Helper comparison function for qsorting by the DECL_UID stored in
5893 alias_pair->emitted_diags. */
5896 tm_alias_pair_cmp (const void *x
, const void *y
)
5898 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5899 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5900 if (p1
->uid
< p2
->uid
)
5902 if (p1
->uid
> p2
->uid
)
5908 finish_tm_clone_pairs (void)
5910 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5912 if (tm_clone_hash
== NULL
)
5915 /* We need a determenistic order for the .tm_clone_table, otherwise
5916 we will get bootstrap comparison failures, so dump the hash table
5917 to a vector, sort it, and dump the vector. */
5919 /* Dump the hashtable to a vector. */
5921 hash_table
<tm_clone_hasher
>::iterator iter
;
5922 FOR_EACH_HASH_TABLE_ELEMENT (*tm_clone_hash
, map
, tree_map
*, iter
)
5924 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5925 tm_alias_pairs
.safe_push (p
);
5928 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5931 dump_tm_clone_pairs (tm_alias_pairs
);
5933 tm_clone_hash
->empty ();
5934 tm_clone_hash
= NULL
;
5935 tm_alias_pairs
.release ();
5939 /* Emit an assembler directive to set symbol for DECL visibility to
5940 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5943 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5944 int vis ATTRIBUTE_UNUSED
)
5946 #ifdef HAVE_GAS_HIDDEN
5947 static const char * const visibility_types
[] = {
5948 NULL
, "protected", "hidden", "internal"
5951 const char *name
, *type
;
5954 id
= DECL_ASSEMBLER_NAME (decl
);
5955 ultimate_transparent_alias_target (&id
);
5956 name
= IDENTIFIER_POINTER (id
);
5958 type
= visibility_types
[vis
];
5960 fprintf (asm_out_file
, "\t.%s\t", type
);
5961 assemble_name (asm_out_file
, name
);
5962 fprintf (asm_out_file
, "\n");
5964 if (!DECL_ARTIFICIAL (decl
))
5965 warning (OPT_Wattributes
, "visibility attribute not supported "
5966 "in this configuration; ignored");
5970 /* A helper function to call assemble_visibility when needed for a decl. */
5973 maybe_assemble_visibility (tree decl
)
5975 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5977 if (TREE_CODE (decl
) == FUNCTION_DECL
5978 && cgraph_node::get (decl
)
5979 && cgraph_node::get (decl
)->instrumentation_clone
5980 && cgraph_node::get (decl
)->instrumented_version
)
5981 vis
= DECL_VISIBILITY (cgraph_node::get (decl
)->instrumented_version
->decl
);
5983 if (vis
!= VISIBILITY_DEFAULT
)
5985 targetm
.asm_out
.assemble_visibility (decl
, vis
);
5992 /* Returns 1 if the target configuration supports defining public symbols
5993 so that one of them will be chosen at link time instead of generating a
5994 multiply-defined symbol error, whether through the use of weak symbols or
5995 a target-specific mechanism for having duplicates discarded. */
5998 supports_one_only (void)
6000 if (SUPPORTS_ONE_ONLY
)
6002 return TARGET_SUPPORTS_WEAK
;
6005 /* Set up DECL as a public symbol that can be defined in multiple
6006 translation units without generating a linker error. */
6009 make_decl_one_only (tree decl
, tree comdat_group
)
6011 struct symtab_node
*symbol
;
6012 gcc_assert (TREE_CODE (decl
) == VAR_DECL
6013 || TREE_CODE (decl
) == FUNCTION_DECL
);
6015 TREE_PUBLIC (decl
) = 1;
6017 if (TREE_CODE (decl
) == VAR_DECL
)
6018 symbol
= varpool_node::get_create (decl
);
6020 symbol
= cgraph_node::get_create (decl
);
6022 if (SUPPORTS_ONE_ONLY
)
6024 #ifdef MAKE_DECL_ONE_ONLY
6025 MAKE_DECL_ONE_ONLY (decl
);
6027 symbol
->set_comdat_group (comdat_group
);
6029 else if (TREE_CODE (decl
) == VAR_DECL
6030 && (DECL_INITIAL (decl
) == 0
6031 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6032 DECL_COMMON (decl
) = 1;
6035 gcc_assert (TARGET_SUPPORTS_WEAK
);
6036 DECL_WEAK (decl
) = 1;
6041 init_varasm_once (void)
6043 section_htab
= hash_table
<section_hasher
>::create_ggc (31);
6044 object_block_htab
= hash_table
<object_block_hasher
>::create_ggc (31);
6045 const_desc_htab
= hash_table
<tree_descriptor_hasher
>::create_ggc (1009);
6047 shared_constant_pool
= create_constant_pool ();
6049 #ifdef TEXT_SECTION_ASM_OP
6050 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
6051 TEXT_SECTION_ASM_OP
);
6054 #ifdef DATA_SECTION_ASM_OP
6055 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6056 DATA_SECTION_ASM_OP
);
6059 #ifdef SDATA_SECTION_ASM_OP
6060 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6061 SDATA_SECTION_ASM_OP
);
6064 #ifdef READONLY_DATA_SECTION_ASM_OP
6065 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
6066 READONLY_DATA_SECTION_ASM_OP
);
6069 #ifdef CTORS_SECTION_ASM_OP
6070 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
6071 CTORS_SECTION_ASM_OP
);
6074 #ifdef DTORS_SECTION_ASM_OP
6075 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
6076 DTORS_SECTION_ASM_OP
);
6079 #ifdef BSS_SECTION_ASM_OP
6080 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6081 output_section_asm_op
,
6082 BSS_SECTION_ASM_OP
);
6085 #ifdef SBSS_SECTION_ASM_OP
6086 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6087 output_section_asm_op
,
6088 SBSS_SECTION_ASM_OP
);
6091 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6092 | SECTION_COMMON
, emit_tls_common
);
6093 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6094 | SECTION_COMMON
, emit_local
);
6095 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6096 | SECTION_COMMON
, emit_common
);
6098 #if defined ASM_OUTPUT_ALIGNED_BSS
6099 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
6103 targetm
.asm_out
.init_sections ();
6105 if (readonly_data_section
== NULL
)
6106 readonly_data_section
= text_section
;
6108 #ifdef ASM_OUTPUT_EXTERNAL
6109 pending_assemble_externals_set
= new hash_set
<tree
>;
6114 decl_default_tls_model (const_tree decl
)
6116 enum tls_model kind
;
6119 is_local
= targetm
.binds_local_p (decl
);
6123 kind
= TLS_MODEL_LOCAL_EXEC
;
6125 kind
= TLS_MODEL_INITIAL_EXEC
;
6128 /* Local dynamic is inefficient when we're not combining the
6129 parts of the address. */
6130 else if (optimize
&& is_local
)
6131 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
6133 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
6134 if (kind
< flag_tls_default
)
6135 kind
= flag_tls_default
;
6140 /* Select a set of attributes for section NAME based on the properties
6141 of DECL and whether or not RELOC indicates that DECL's initializer
6142 might contain runtime relocations.
6144 We make the section read-only and executable for a function decl,
6145 read-only for a const data decl, and writable for a non-const data decl. */
6148 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6152 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6153 flags
= SECTION_CODE
;
6156 enum section_category category
6157 = categorize_decl_for_section (decl
, reloc
);
6158 if (decl_readonly_section_1 (category
))
6160 else if (category
== SECCAT_DATA_REL_RO
6161 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6162 flags
= SECTION_WRITE
| SECTION_RELRO
;
6164 flags
= SECTION_WRITE
;
6168 flags
= SECTION_WRITE
;
6169 if (strcmp (name
, ".data.rel.ro") == 0
6170 || strcmp (name
, ".data.rel.ro.local") == 0)
6171 flags
|= SECTION_RELRO
;
6174 if (decl
&& DECL_P (decl
) && DECL_COMDAT_GROUP (decl
))
6175 flags
|= SECTION_LINKONCE
;
6177 if (strcmp (name
, ".vtable_map_vars") == 0)
6178 flags
|= SECTION_LINKONCE
;
6180 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6181 flags
|= SECTION_TLS
| SECTION_WRITE
;
6183 if (strcmp (name
, ".bss") == 0
6184 || strncmp (name
, ".bss.", 5) == 0
6185 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6186 || strcmp (name
, ".persistent.bss") == 0
6187 || strcmp (name
, ".sbss") == 0
6188 || strncmp (name
, ".sbss.", 6) == 0
6189 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6190 flags
|= SECTION_BSS
;
6192 if (strcmp (name
, ".tdata") == 0
6193 || strncmp (name
, ".tdata.", 7) == 0
6194 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6195 flags
|= SECTION_TLS
;
6197 if (strcmp (name
, ".tbss") == 0
6198 || strncmp (name
, ".tbss.", 6) == 0
6199 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6200 flags
|= SECTION_TLS
| SECTION_BSS
;
6202 /* These three sections have special ELF types. They are neither
6203 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6204 want to print a section type (@progbits or @nobits). If someone
6205 is silly enough to emit code or TLS variables to one of these
6206 sections, then don't handle them specially. */
6207 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6208 && (strcmp (name
, ".init_array") == 0
6209 || strcmp (name
, ".fini_array") == 0
6210 || strcmp (name
, ".preinit_array") == 0))
6211 flags
|= SECTION_NOTYPE
;
6216 /* Return true if the target supports some form of global BSS,
6217 either through bss_noswitch_section, or by selecting a BSS
6218 section in TARGET_ASM_SELECT_SECTION. */
6221 have_global_bss_p (void)
6223 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6226 /* Output assembly to switch to section NAME with attribute FLAGS.
6227 Four variants for common object file formats. */
6230 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6231 unsigned int flags ATTRIBUTE_UNUSED
,
6232 tree decl ATTRIBUTE_UNUSED
)
6234 /* Some object formats don't support named sections at all. The
6235 front-end should already have flagged this as an error. */
6239 #ifndef TLS_SECTION_ASM_FLAG
6240 #define TLS_SECTION_ASM_FLAG 'T'
6244 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6245 tree decl ATTRIBUTE_UNUSED
)
6247 char flagchars
[10], *f
= flagchars
;
6249 /* If we have already declared this section, we can use an
6250 abbreviated form to switch back to it -- unless this section is
6251 part of a COMDAT groups, in which case GAS requires the full
6252 declaration every time. */
6253 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6254 && (flags
& SECTION_DECLARED
))
6256 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6260 if (!(flags
& SECTION_DEBUG
))
6262 #if defined (HAVE_GAS_SECTION_EXCLUDE) && HAVE_GAS_SECTION_EXCLUDE == 1
6263 if (flags
& SECTION_EXCLUDE
)
6266 if (flags
& SECTION_WRITE
)
6268 if (flags
& SECTION_CODE
)
6270 if (flags
& SECTION_SMALL
)
6272 if (flags
& SECTION_MERGE
)
6274 if (flags
& SECTION_STRINGS
)
6276 if (flags
& SECTION_TLS
)
6277 *f
++ = TLS_SECTION_ASM_FLAG
;
6278 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6282 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6284 if (!(flags
& SECTION_NOTYPE
))
6289 if (flags
& SECTION_BSS
)
6295 /* On platforms that use "@" as the assembly comment character,
6297 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6299 fprintf (asm_out_file
, format
, type
);
6301 if (flags
& SECTION_ENTSIZE
)
6302 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6303 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6305 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6306 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6308 fprintf (asm_out_file
, ",%s,comdat",
6309 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6313 putc ('\n', asm_out_file
);
6317 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6318 tree decl ATTRIBUTE_UNUSED
)
6320 char flagchars
[8], *f
= flagchars
;
6322 if (flags
& SECTION_WRITE
)
6324 if (flags
& SECTION_CODE
)
6328 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6332 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6335 default_coff_asm_named_section (name
, flags
, decl
);
6337 if (flags
& SECTION_LINKONCE
)
6339 /* Functions may have been compiled at various levels of
6340 optimization so we can't use `same_size' here.
6341 Instead, have the linker pick one. */
6342 fprintf (asm_out_file
, "\t.linkonce %s\n",
6343 (flags
& SECTION_CODE
? "discard" : "same_size"));
6347 /* The lame default section selector. */
6350 default_select_section (tree decl
, int reloc
,
6351 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6355 if (decl_readonly_section (decl
, reloc
))
6356 return readonly_data_section
;
6358 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6360 if (! ((flag_pic
&& reloc
)
6361 || !TREE_READONLY (decl
)
6362 || TREE_SIDE_EFFECTS (decl
)
6363 || !TREE_CONSTANT (decl
)))
6364 return readonly_data_section
;
6366 else if (TREE_CODE (decl
) == STRING_CST
)
6367 return readonly_data_section
;
6368 else if (! (flag_pic
&& reloc
))
6369 return readonly_data_section
;
6371 return data_section
;
6374 enum section_category
6375 categorize_decl_for_section (const_tree decl
, int reloc
)
6377 enum section_category ret
;
6379 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6381 else if (TREE_CODE (decl
) == STRING_CST
)
6383 if ((flag_sanitize
& SANITIZE_ADDRESS
)
6384 && asan_protect_global (CONST_CAST_TREE (decl
)))
6385 /* or !flag_merge_constants */
6386 return SECCAT_RODATA
;
6388 return SECCAT_RODATA_MERGE_STR
;
6390 else if (TREE_CODE (decl
) == VAR_DECL
)
6392 if (bss_initializer_p (decl
))
6394 else if (! TREE_READONLY (decl
)
6395 || TREE_SIDE_EFFECTS (decl
)
6396 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6398 /* Here the reloc_rw_mask is not testing whether the section should
6399 be read-only or not, but whether the dynamic link will have to
6400 do something. If so, we wish to segregate the data in order to
6401 minimize cache misses inside the dynamic linker. */
6402 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6403 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6407 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6408 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6409 else if (reloc
|| flag_merge_constants
< 2
6410 || ((flag_sanitize
& SANITIZE_ADDRESS
)
6411 && asan_protect_global (CONST_CAST_TREE (decl
))))
6412 /* C and C++ don't allow different variables to share the same
6413 location. -fmerge-all-constants allows even that (at the
6414 expense of not conforming). */
6415 ret
= SECCAT_RODATA
;
6416 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6417 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6419 ret
= SECCAT_RODATA_MERGE_CONST
;
6421 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6423 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6424 || TREE_SIDE_EFFECTS (decl
)
6425 || ! TREE_CONSTANT (decl
))
6428 ret
= SECCAT_RODATA
;
6431 ret
= SECCAT_RODATA
;
6433 /* There are no read-only thread-local sections. */
6434 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6436 /* Note that this would be *just* SECCAT_BSS, except that there's
6437 no concept of a read-only thread-local-data section. */
6438 if (ret
== SECCAT_BSS
6439 || (flag_zero_initialized_in_bss
6440 && initializer_zerop (DECL_INITIAL (decl
))))
6446 /* If the target uses small data sections, select it. */
6447 else if (targetm
.in_small_data_p (decl
))
6449 if (ret
== SECCAT_BSS
)
6451 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6452 ret
= SECCAT_SRODATA
;
6461 decl_readonly_section_1 (enum section_category category
)
6466 case SECCAT_RODATA_MERGE_STR
:
6467 case SECCAT_RODATA_MERGE_STR_INIT
:
6468 case SECCAT_RODATA_MERGE_CONST
:
6469 case SECCAT_SRODATA
:
6477 decl_readonly_section (const_tree decl
, int reloc
)
6479 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6482 /* Select a section based on the above categorization. */
6485 default_elf_select_section (tree decl
, int reloc
,
6486 unsigned HOST_WIDE_INT align
)
6489 switch (categorize_decl_for_section (decl
, reloc
))
6492 /* We're not supposed to be called on FUNCTION_DECLs. */
6495 return readonly_data_section
;
6496 case SECCAT_RODATA_MERGE_STR
:
6497 return mergeable_string_section (decl
, align
, 0);
6498 case SECCAT_RODATA_MERGE_STR_INIT
:
6499 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6500 case SECCAT_RODATA_MERGE_CONST
:
6501 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6502 case SECCAT_SRODATA
:
6506 return data_section
;
6507 case SECCAT_DATA_REL
:
6508 sname
= ".data.rel";
6510 case SECCAT_DATA_REL_LOCAL
:
6511 sname
= ".data.rel.local";
6513 case SECCAT_DATA_REL_RO
:
6514 sname
= ".data.rel.ro";
6516 case SECCAT_DATA_REL_RO_LOCAL
:
6517 sname
= ".data.rel.ro.local";
6540 return get_named_section (decl
, sname
, reloc
);
6543 /* Construct a unique section name based on the decl name and the
6544 categorization performed above. */
6547 default_unique_section (tree decl
, int reloc
)
6549 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6550 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6551 const char *prefix
, *name
, *linkonce
;
6555 switch (categorize_decl_for_section (decl
, reloc
))
6558 prefix
= one_only
? ".t" : ".text";
6561 case SECCAT_RODATA_MERGE_STR
:
6562 case SECCAT_RODATA_MERGE_STR_INIT
:
6563 case SECCAT_RODATA_MERGE_CONST
:
6564 prefix
= one_only
? ".r" : ".rodata";
6566 case SECCAT_SRODATA
:
6567 prefix
= one_only
? ".s2" : ".sdata2";
6570 prefix
= one_only
? ".d" : ".data";
6572 case SECCAT_DATA_REL
:
6573 prefix
= one_only
? ".d.rel" : ".data.rel";
6575 case SECCAT_DATA_REL_LOCAL
:
6576 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6578 case SECCAT_DATA_REL_RO
:
6579 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6581 case SECCAT_DATA_REL_RO_LOCAL
:
6582 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6585 prefix
= one_only
? ".s" : ".sdata";
6588 prefix
= one_only
? ".b" : ".bss";
6591 prefix
= one_only
? ".sb" : ".sbss";
6594 prefix
= one_only
? ".td" : ".tdata";
6597 prefix
= one_only
? ".tb" : ".tbss";
6603 id
= DECL_ASSEMBLER_NAME (decl
);
6604 ultimate_transparent_alias_target (&id
);
6605 name
= IDENTIFIER_POINTER (id
);
6606 name
= targetm
.strip_name_encoding (name
);
6608 /* If we're using one_only, then there needs to be a .gnu.linkonce
6609 prefix to the section name. */
6610 linkonce
= one_only
? ".gnu.linkonce" : "";
6612 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6614 set_decl_section_name (decl
, string
);
6617 /* Subroutine of compute_reloc_for_rtx for leaf rtxes. */
6620 compute_reloc_for_rtx_1 (const_rtx x
)
6622 switch (GET_CODE (x
))
6625 return SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6633 /* Like compute_reloc_for_constant, except for an RTX. The return value
6634 is a mask for which bit 1 indicates a global relocation, and bit 0
6635 indicates a local relocation. */
6638 compute_reloc_for_rtx (const_rtx x
)
6640 switch (GET_CODE (x
))
6644 return compute_reloc_for_rtx_1 (x
);
6649 subrtx_iterator::array_type array
;
6650 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
6651 reloc
|= compute_reloc_for_rtx_1 (*iter
);
6661 default_select_rtx_section (machine_mode mode ATTRIBUTE_UNUSED
,
6663 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6665 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6666 return data_section
;
6668 return readonly_data_section
;
6672 default_elf_select_rtx_section (machine_mode mode
, rtx x
,
6673 unsigned HOST_WIDE_INT align
)
6675 int reloc
= compute_reloc_for_rtx (x
);
6677 /* ??? Handle small data here somehow. */
6679 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6682 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6684 return get_named_section (NULL
, ".data.rel.ro", 3);
6687 return mergeable_constant_section (mode
, align
, 0);
6690 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6693 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6698 /* Careful not to prod global register variables. */
6701 symbol
= XEXP (rtl
, 0);
6702 if (GET_CODE (symbol
) != SYMBOL_REF
)
6705 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6706 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6707 flags
|= SYMBOL_FLAG_FUNCTION
;
6708 if (targetm
.binds_local_p (decl
))
6709 flags
|= SYMBOL_FLAG_LOCAL
;
6710 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6711 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6712 else if (targetm
.in_small_data_p (decl
))
6713 flags
|= SYMBOL_FLAG_SMALL
;
6714 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6715 being PUBLIC, the thing *must* be defined in this translation unit.
6716 Prevent this buglet from being propagated into rtl code as well. */
6717 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6718 flags
|= SYMBOL_FLAG_EXTERNAL
;
6720 SYMBOL_REF_FLAGS (symbol
) = flags
;
6723 /* By default, we do nothing for encode_section_info, so we need not
6724 do anything but discard the '*' marker. */
6727 default_strip_name_encoding (const char *str
)
6729 return str
+ (*str
== '*');
6732 #ifdef ASM_OUTPUT_DEF
6733 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6734 anchor relative to ".", the current section position. */
6737 default_asm_output_anchor (rtx symbol
)
6741 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6742 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6743 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6747 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6750 default_use_anchors_for_symbol_p (const_rtx symbol
)
6755 /* Don't use anchors for mergeable sections. The linker might move
6756 the objects around. */
6757 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6758 if (sect
->common
.flags
& SECTION_MERGE
)
6761 /* Don't use anchors for small data sections. The small data register
6762 acts as an anchor for such sections. */
6763 if (sect
->common
.flags
& SECTION_SMALL
)
6766 decl
= SYMBOL_REF_DECL (symbol
);
6767 if (decl
&& DECL_P (decl
))
6769 /* Don't use section anchors for decls that might be defined or
6770 usurped by other modules. */
6771 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
6774 /* Don't use section anchors for decls that will be placed in a
6775 small data section. */
6776 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6777 one above. The problem is that we only use SECTION_SMALL for
6778 sections that should be marked as small in the section directive. */
6779 if (targetm
.in_small_data_p (decl
))
6785 /* Return true when RESOLUTION indicate that symbol will be bound to the
6786 definition provided by current .o file. */
6789 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6791 return (resolution
== LDPR_PREVAILING_DEF
6792 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6793 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6796 /* Return true when RESOLUTION indicate that symbol will be bound locally
6797 within current executable or DSO. */
6800 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6802 return (resolution
== LDPR_PREVAILING_DEF
6803 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6804 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6805 || resolution
== LDPR_PREEMPTED_REG
6806 || resolution
== LDPR_PREEMPTED_IR
6807 || resolution
== LDPR_RESOLVED_IR
6808 || resolution
== LDPR_RESOLVED_EXEC
);
6812 default_binds_local_p_2 (const_tree exp
, bool shlib
, bool weak_dominate
)
6814 /* A non-decl is an entry in the constant pool. */
6818 /* Weakrefs may not bind locally, even though the weakref itself is always
6819 static and therefore local. Similarly, the resolver for ifunc functions
6820 might resolve to a non-local function.
6821 FIXME: We can resolve the weakref case more curefuly by looking at the
6823 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6824 || (TREE_CODE (exp
) == FUNCTION_DECL
6825 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6828 /* Static variables are always local. */
6829 if (! TREE_PUBLIC (exp
))
6832 /* With resolution file in hand, take look into resolutions.
6833 We can't just return true for resolved_locally symbols,
6834 because dynamic linking might overwrite symbols
6835 in shared libraries. */
6836 bool resolved_locally
= false;
6837 bool defined_locally
= !DECL_EXTERNAL (exp
);
6838 if (symtab_node
*node
= symtab_node::get (exp
))
6840 if (node
->in_other_partition
)
6841 defined_locally
= true;
6842 if (resolution_to_local_definition_p (node
->resolution
))
6843 defined_locally
= resolved_locally
= true;
6844 else if (resolution_local_p (node
->resolution
))
6845 resolved_locally
= true;
6847 if (defined_locally
&& weak_dominate
&& !shlib
)
6848 resolved_locally
= true;
6850 /* Undefined weak symbols are never defined locally. */
6851 if (DECL_WEAK (exp
) && !defined_locally
)
6854 /* A symbol is local if the user has said explicitly that it will be,
6855 or if we have a definition for the symbol. We cannot infer visibility
6856 for undefined symbols. */
6857 if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
6858 && (DECL_VISIBILITY_SPECIFIED (exp
) || defined_locally
))
6861 /* If PIC, then assume that any global name can be overridden by
6862 symbols resolved from other modules. */
6866 /* Variables defined outside this object might not be local. */
6867 if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6870 /* Non-dominant weak symbols are not defined locally. */
6871 if (DECL_WEAK (exp
) && !resolved_locally
)
6874 /* Uninitialized COMMON variable may be unified with symbols
6875 resolved from other modules. */
6876 if (DECL_COMMON (exp
)
6877 && !resolved_locally
6878 && (DECL_INITIAL (exp
) == NULL
6879 || (!in_lto_p
&& DECL_INITIAL (exp
) == error_mark_node
)))
6882 /* Otherwise we're left with initialized (or non-common) global data
6883 which is of necessity defined locally. */
6887 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6888 wrt cross-module name binding. */
6891 default_binds_local_p (const_tree exp
)
6893 return default_binds_local_p_2 (exp
, flag_shlib
!= 0, true);
6897 default_binds_local_p_1 (const_tree exp
, int shlib
)
6899 return default_binds_local_p_2 (exp
, shlib
!= 0, false);
6902 /* Return true when references to DECL must bind to current definition in
6905 The condition is usually equivalent to whether the function binds to the
6906 current module (shared library or executable), that is to binds_local_p.
6907 We use this fact to avoid need for another target hook and implement
6908 the logic using binds_local_p and just special cases where
6909 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6910 the weak definitions (that can be overwritten at linktime by other
6911 definition from different object file) and when resolution info is available
6912 we simply use the knowledge passed to us by linker plugin. */
6914 decl_binds_to_current_def_p (const_tree decl
)
6916 gcc_assert (DECL_P (decl
));
6917 if (!targetm
.binds_local_p (decl
))
6919 if (!TREE_PUBLIC (decl
))
6922 /* When resolution is available, just use it. */
6923 if (symtab_node
*node
= symtab_node::get (decl
))
6925 if (node
->resolution
!= LDPR_UNKNOWN
)
6926 return resolution_to_local_definition_p (node
->resolution
);
6929 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6930 binds locally but still can be overwritten), DECL_COMMON (can be merged
6931 with a non-common definition somewhere in the same module) or
6933 This rely on fact that binds_local_p behave as decl_replaceable_p
6934 for all other declaration types. */
6935 if (DECL_WEAK (decl
))
6937 if (DECL_COMMON (decl
)
6938 && (DECL_INITIAL (decl
) == NULL
6939 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6941 if (DECL_EXTERNAL (decl
))
6946 /* A replaceable function or variable is one which may be replaced
6947 at link-time with an entirely different definition, provided that the
6948 replacement has the same type. For example, functions declared
6949 with __attribute__((weak)) on most systems are replaceable.
6951 COMDAT functions are not replaceable, since all definitions of the
6952 function must be equivalent. It is important that COMDAT functions
6953 not be treated as replaceable so that use of C++ template
6954 instantiations is not penalized. */
6957 decl_replaceable_p (tree decl
)
6959 gcc_assert (DECL_P (decl
));
6960 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
6962 if (!flag_semantic_interposition
6963 && !DECL_WEAK (decl
))
6965 return !decl_binds_to_current_def_p (decl
);
6968 /* Default function to output code that will globalize a label. A
6969 target must define GLOBAL_ASM_OP or provide its own function to
6970 globalize a label. */
6971 #ifdef GLOBAL_ASM_OP
6973 default_globalize_label (FILE * stream
, const char *name
)
6975 fputs (GLOBAL_ASM_OP
, stream
);
6976 assemble_name (stream
, name
);
6977 putc ('\n', stream
);
6979 #endif /* GLOBAL_ASM_OP */
6981 /* Default function to output code that will globalize a declaration. */
6983 default_globalize_decl_name (FILE * stream
, tree decl
)
6985 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6986 targetm
.asm_out
.globalize_label (stream
, name
);
6989 /* Default function to output a label for unwind information. The
6990 default is to do nothing. A target that needs nonlocal labels for
6991 unwind information must provide its own function to do this. */
6993 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6994 tree decl ATTRIBUTE_UNUSED
,
6995 int for_eh ATTRIBUTE_UNUSED
,
6996 int empty ATTRIBUTE_UNUSED
)
7000 /* Default function to output a label to divide up the exception table.
7001 The default is to do nothing. A target that needs/wants to divide
7002 up the table must provide it's own function to do this. */
7004 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
7008 /* This is how to output an internal numbered label where PREFIX is
7009 the class of label and LABELNO is the number within the class. */
7012 default_generate_internal_label (char *buf
, const char *prefix
,
7013 unsigned long labelno
)
7015 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7018 /* This is how to output an internal numbered label where PREFIX is
7019 the class of label and LABELNO is the number within the class. */
7022 default_internal_label (FILE *stream
, const char *prefix
,
7023 unsigned long labelno
)
7025 char *const buf
= (char *) alloca (40 + strlen (prefix
));
7026 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7027 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
7031 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
7034 default_asm_declare_constant_name (FILE *file
, const char *name
,
7035 const_tree exp ATTRIBUTE_UNUSED
,
7036 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
7038 assemble_label (file
, name
);
7041 /* This is the default behavior at the beginning of a file. It's
7042 controlled by two other target-hook toggles. */
7044 default_file_start (void)
7046 if (targetm
.asm_file_start_app_off
7047 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
7048 fputs (ASM_APP_OFF
, asm_out_file
);
7050 if (targetm
.asm_file_start_file_directive
)
7052 /* LTO produced units have no meaningful main_input_filename. */
7054 output_file_directive (asm_out_file
, "<artificial>");
7056 output_file_directive (asm_out_file
, main_input_filename
);
7060 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
7061 which emits a special section directive used to indicate whether or
7062 not this object file needs an executable stack. This is primarily
7063 a GNU extension to ELF but could be used on other targets. */
7065 int trampolines_created
;
7068 file_end_indicate_exec_stack (void)
7070 unsigned int flags
= SECTION_DEBUG
;
7071 if (trampolines_created
)
7072 flags
|= SECTION_CODE
;
7074 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
7077 /* Emit a special section directive to indicate that this object file
7078 was compiled with -fsplit-stack. This is used to let the linker
7079 detect calls between split-stack code and non-split-stack code, so
7080 that it can modify the split-stack code to allocate a sufficiently
7081 large stack. We emit another special section if there are any
7082 functions in this file which have the no_split_stack attribute, to
7083 prevent the linker from warning about being unable to convert the
7084 functions if they call non-split-stack code. */
7087 file_end_indicate_split_stack (void)
7089 if (flag_split_stack
)
7091 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
7093 if (saw_no_split_stack
)
7094 switch_to_section (get_section (".note.GNU-no-split-stack",
7095 SECTION_DEBUG
, NULL
));
7099 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
7100 a get_unnamed_section callback. */
7103 output_section_asm_op (const void *directive
)
7105 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
7108 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
7109 the current section is NEW_SECTION. */
7112 switch_to_section (section
*new_section
)
7114 if (in_section
== new_section
)
7117 if (new_section
->common
.flags
& SECTION_FORGET
)
7120 in_section
= new_section
;
7122 switch (SECTION_STYLE (new_section
))
7125 targetm
.asm_out
.named_section (new_section
->named
.name
,
7126 new_section
->named
.common
.flags
,
7127 new_section
->named
.decl
);
7130 case SECTION_UNNAMED
:
7131 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
7134 case SECTION_NOSWITCH
:
7139 new_section
->common
.flags
|= SECTION_DECLARED
;
7142 /* If block symbol SYMBOL has not yet been assigned an offset, place
7143 it at the end of its block. */
7146 place_block_symbol (rtx symbol
)
7148 unsigned HOST_WIDE_INT size
, mask
, offset
;
7149 struct constant_descriptor_rtx
*desc
;
7150 unsigned int alignment
;
7151 struct object_block
*block
;
7154 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7155 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7158 /* Work out the symbol's size and alignment. */
7159 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7161 desc
= SYMBOL_REF_CONSTANT (symbol
);
7162 alignment
= desc
->align
;
7163 size
= GET_MODE_SIZE (desc
->mode
);
7165 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7167 decl
= SYMBOL_REF_DECL (symbol
);
7168 gcc_checking_assert (DECL_IN_CONSTANT_POOL (decl
));
7169 alignment
= DECL_ALIGN (decl
);
7170 size
= get_constant_size (DECL_INITIAL (decl
));
7171 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7172 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7173 && asan_protect_global (DECL_INITIAL (decl
)))
7174 size
+= asan_red_zone_size (size
);
7178 struct symtab_node
*snode
;
7179 decl
= SYMBOL_REF_DECL (symbol
);
7181 snode
= symtab_node::get (decl
);
7184 rtx target
= DECL_RTL (snode
->ultimate_alias_target ()->decl
);
7186 gcc_assert (MEM_P (target
)
7187 && GET_CODE (XEXP (target
, 0)) == SYMBOL_REF
7188 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (target
, 0)));
7189 target
= XEXP (target
, 0);
7190 place_block_symbol (target
);
7191 SYMBOL_REF_BLOCK_OFFSET (symbol
) = SYMBOL_REF_BLOCK_OFFSET (target
);
7194 alignment
= get_variable_align (decl
);
7195 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7196 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7197 && asan_protect_global (decl
))
7199 size
+= asan_red_zone_size (size
);
7200 alignment
= MAX (alignment
,
7201 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7205 /* Calculate the object's offset from the start of the block. */
7206 block
= SYMBOL_REF_BLOCK (symbol
);
7207 mask
= alignment
/ BITS_PER_UNIT
- 1;
7208 offset
= (block
->size
+ mask
) & ~mask
;
7209 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7211 /* Record the block's new alignment and size. */
7212 block
->alignment
= MAX (block
->alignment
, alignment
);
7213 block
->size
= offset
+ size
;
7215 vec_safe_push (block
->objects
, symbol
);
7218 /* Return the anchor that should be used to address byte offset OFFSET
7219 from the first object in BLOCK. MODEL is the TLS model used
7223 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7224 enum tls_model model
)
7227 unsigned int begin
, middle
, end
;
7228 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7231 /* Work out the anchor's offset. Use an offset of 0 for the first
7232 anchor so that we don't pessimize the case where we take the address
7233 of a variable at the beginning of the block. This is particularly
7234 useful when a block has only one variable assigned to it.
7236 We try to place anchors RANGE bytes apart, so there can then be
7237 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7238 a ptr_mode offset. With some target settings, the lowest such
7239 anchor might be out of range for the lowest ptr_mode offset;
7240 likewise the highest anchor for the highest offset. Use anchors
7241 at the extreme ends of the ptr_mode range in such cases.
7243 All arithmetic uses unsigned integers in order to avoid
7245 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7246 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7247 range
= max_offset
- min_offset
+ 1;
7252 bias
= HOST_WIDE_INT_1U
<< (GET_MODE_BITSIZE (ptr_mode
) - 1);
7255 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7256 delta
-= delta
% range
;
7259 offset
= (HOST_WIDE_INT
) (-delta
);
7263 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7264 delta
-= delta
% range
;
7265 if (delta
> bias
- 1)
7267 offset
= (HOST_WIDE_INT
) delta
;
7271 /* Do a binary search to see if there's already an anchor we can use.
7272 Set BEGIN to the new anchor's index if not. */
7274 end
= vec_safe_length (block
->anchors
);
7275 while (begin
!= end
)
7277 middle
= (end
+ begin
) / 2;
7278 anchor
= (*block
->anchors
)[middle
];
7279 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7281 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7283 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7285 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7291 /* Create a new anchor with a unique label. */
7292 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7293 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7294 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7295 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7297 /* Insert it at index BEGIN. */
7298 vec_safe_insert (block
->anchors
, begin
, anchor
);
7302 /* Output the objects in BLOCK. */
7305 output_object_block (struct object_block
*block
)
7307 struct constant_descriptor_rtx
*desc
;
7309 HOST_WIDE_INT offset
;
7313 if (!block
->objects
)
7316 /* Switch to the section and make sure that the first byte is
7317 suitably aligned. */
7318 switch_to_section (block
->sect
);
7319 assemble_align (block
->alignment
);
7321 /* Define the values of all anchors relative to the current section
7323 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7324 targetm
.asm_out
.output_anchor (symbol
);
7326 /* Output the objects themselves. */
7328 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7330 /* Move to the object's offset, padding with zeros if necessary. */
7331 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7332 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7333 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7335 desc
= SYMBOL_REF_CONSTANT (symbol
);
7336 output_constant_pool_1 (desc
, 1);
7337 offset
+= GET_MODE_SIZE (desc
->mode
);
7339 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7342 decl
= SYMBOL_REF_DECL (symbol
);
7343 assemble_constant_contents
7344 (DECL_INITIAL (decl
), XSTR (symbol
, 0), DECL_ALIGN (decl
));
7346 size
= get_constant_size (DECL_INITIAL (decl
));
7348 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7349 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7350 && asan_protect_global (DECL_INITIAL (decl
)))
7352 size
= asan_red_zone_size (size
);
7353 assemble_zeros (size
);
7360 decl
= SYMBOL_REF_DECL (symbol
);
7361 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7362 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7364 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7365 && asan_protect_global (decl
))
7367 size
= asan_red_zone_size (size
);
7368 assemble_zeros (size
);
7375 /* A htab_traverse callback used to call output_object_block for
7376 each member of object_block_htab. */
7379 output_object_block_htab (object_block
**slot
, void *)
7381 output_object_block (*slot
);
7385 /* Output the definitions of all object_blocks. */
7388 output_object_blocks (void)
7390 object_block_htab
->traverse
<void *, output_object_block_htab
> (NULL
);
7393 /* This function provides a possible implementation of the
7394 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7395 by -frecord-gcc-switches it creates a new mergeable, string section in the
7396 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7397 contains the switches in ASCII format.
7399 FIXME: This code does not correctly handle double quote characters
7400 that appear inside strings, (it strips them rather than preserving them).
7401 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7402 characters - instead it treats them as sub-string separators. Since
7403 we want to emit NUL strings terminators into the object file we have to use
7407 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7411 case SWITCH_TYPE_PASSED
:
7412 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7413 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7416 case SWITCH_TYPE_DESCRIPTIVE
:
7419 /* Distinguish between invocations where name is NULL. */
7420 static bool started
= false;
7426 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7430 | (SECTION_ENTSIZE
& 1),
7432 switch_to_section (sec
);
7441 /* The return value is currently ignored by the caller, but must be 0.
7442 For -fverbose-asm the return value would be the number of characters
7443 emitted into the assembler file. */
7447 /* Emit text to declare externally defined symbols. It is needed to
7448 properly support non-default visibility. */
7450 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7452 const char *name ATTRIBUTE_UNUSED
)
7454 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7455 set in order to avoid putting out names that are never really
7456 used. Always output visibility specified in the source. */
7457 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7458 && (DECL_VISIBILITY_SPECIFIED (decl
)
7459 || targetm
.binds_local_p (decl
)))
7460 maybe_assemble_visibility (decl
);
7463 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7466 default_asm_output_source_filename (FILE *file
, const char *name
)
7468 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7469 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7471 fprintf (file
, "\t.file\t");
7472 output_quoted_string (file
, name
);
7477 /* Output a file name in the form wanted by System V. */
7480 output_file_directive (FILE *asm_file
, const char *input_name
)
7485 if (input_name
== NULL
)
7486 input_name
= "<stdin>";
7488 input_name
= remap_debug_filename (input_name
);
7490 len
= strlen (input_name
);
7491 na
= input_name
+ len
;
7493 /* NA gets INPUT_NAME sans directory names. */
7494 while (na
> input_name
)
7496 if (IS_DIR_SEPARATOR (na
[-1]))
7501 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7504 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7507 make_debug_expr_from_rtl (const_rtx exp
)
7509 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7510 machine_mode mode
= GET_MODE (exp
);
7513 DECL_ARTIFICIAL (ddecl
) = 1;
7514 if (REG_P (exp
) && REG_EXPR (exp
))
7515 type
= TREE_TYPE (REG_EXPR (exp
));
7516 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7517 type
= TREE_TYPE (MEM_EXPR (exp
));
7520 if (type
&& TYPE_MODE (type
) == mode
)
7521 TREE_TYPE (ddecl
) = type
;
7523 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7524 DECL_MODE (ddecl
) = mode
;
7525 dval
= gen_rtx_DEBUG_EXPR (mode
);
7526 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7527 SET_DECL_RTL (ddecl
, dval
);
7531 #ifdef ELF_ASCII_ESCAPES
7532 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7535 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7540 fputs (STRING_ASM_OP
, f
);
7545 escape
= ELF_ASCII_ESCAPES
[c
];
7552 /* TODO: Print in hex with fast function, important for -flto. */
7553 fprintf (f
, "\\%03o", c
);
7566 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7569 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7571 const char *limit
= s
+ len
;
7572 const char *last_null
= NULL
;
7573 unsigned bytes_in_chunk
= 0;
7577 for (; s
< limit
; s
++)
7581 if (bytes_in_chunk
>= 60)
7590 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7597 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7599 if (bytes_in_chunk
> 0)
7606 default_elf_asm_output_limited_string (f
, s
);
7611 if (bytes_in_chunk
== 0)
7612 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7615 escape
= ELF_ASCII_ESCAPES
[c
];
7623 /* TODO: Print in hex with fast function, important for -flto. */
7624 fprintf (f
, "\\%03o", c
);
7625 bytes_in_chunk
+= 4;
7630 bytes_in_chunk
+= 2;
7637 if (bytes_in_chunk
> 0)
7645 static GTY(()) section
*elf_init_array_section
;
7646 static GTY(()) section
*elf_fini_array_section
;
7649 get_elf_initfini_array_priority_section (int priority
,
7653 if (priority
!= DEFAULT_INIT_PRIORITY
)
7656 sprintf (buf
, "%s.%.5u",
7657 constructor_p
? ".init_array" : ".fini_array",
7659 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7665 if (elf_init_array_section
== NULL
)
7666 elf_init_array_section
7667 = get_section (".init_array",
7668 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7669 sec
= elf_init_array_section
;
7673 if (elf_fini_array_section
== NULL
)
7674 elf_fini_array_section
7675 = get_section (".fini_array",
7676 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7677 sec
= elf_fini_array_section
;
7683 /* Use .init_array section for constructors. */
7686 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7688 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7690 assemble_addr_to_section (symbol
, sec
);
7693 /* Use .fini_array section for destructors. */
7696 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7698 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7700 assemble_addr_to_section (symbol
, sec
);
7703 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7705 This is a bit of a cheat. The real default is a no-op, but this
7706 hook is the default for all targets with a .ident directive. */
7709 default_asm_output_ident_directive (const char *ident_str
)
7711 const char *ident_asm_op
= "\t.ident\t";
7713 /* If we are still in the front end, do not write out the string
7714 to asm_out_file. Instead, add a fake top-level asm statement.
7715 This allows the front ends to use this hook without actually
7716 writing to asm_out_file, to handle #ident or Pragma Ident. */
7717 if (symtab
->state
== PARSING
)
7719 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7720 symtab
->finalize_toplevel_asm (build_string (strlen (buf
), buf
));
7723 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7726 #include "gt-varasm.h"