1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987-2023 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
21 /* This file handles generation of all the assembler code
22 *except* the instructions of a function.
23 This includes declarations of variables and their initial values.
25 We also output the assembler code for constants stored in memory
26 and are responsible for combining constants with the same value. */
30 #include "coretypes.h"
38 #include "stringpool.h"
42 #include "diagnostic-core.h"
43 #include "fold-const.h"
44 #include "stor-layout.h"
53 #include "langhooks.h"
55 #include "common/common-target.h"
56 #include "stringpool.h"
60 #include "file-prefix-map.h" /* remap_debug_filename() */
61 #include "alloc-pool.h"
65 /* The (assembler) name of the first globally-visible object output. */
66 extern GTY(()) const char *first_global_object_name
;
67 extern GTY(()) const char *weak_global_object_name
;
69 const char *first_global_object_name
;
70 const char *weak_global_object_name
;
73 class constant_descriptor_rtx
;
74 struct rtx_constant_pool
;
76 #define n_deferred_constants (crtl->varasm.deferred_constants)
78 /* Number for making the label on the next
79 constant that is stored in memory. */
81 static GTY(()) int const_labelno
;
83 /* Carry information from ASM_DECLARE_OBJECT_NAME
84 to ASM_FINISH_DECLARE_OBJECT. */
86 int size_directive_output
;
88 /* The last decl for which assemble_variable was called,
89 if it did ASM_DECLARE_OBJECT_NAME.
90 If the last call to assemble_variable didn't do that,
93 tree last_assemble_variable_decl
;
95 /* The following global variable indicates if the first basic block
96 in a function belongs to the cold partition or not. */
98 bool first_function_block_is_cold
;
100 /* Whether we saw any functions with no_split_stack. */
102 static bool saw_no_split_stack
;
104 static const char *strip_reg_name (const char *);
105 static bool contains_pointers_p (tree
);
106 #ifdef ASM_OUTPUT_EXTERNAL
107 static bool incorporeal_function_p (tree
);
109 static void decode_addr_const (tree
, class addr_const
*);
110 static hashval_t
const_hash_1 (const tree
);
111 static bool compare_constant (const tree
, const tree
);
112 static void output_constant_def_contents (rtx
);
113 static void output_addressed_constants (tree
, int);
114 static unsigned HOST_WIDE_INT
output_constant (tree
, unsigned HOST_WIDE_INT
,
115 unsigned int, bool, bool);
116 static void globalize_decl (tree
);
117 static bool decl_readonly_section_1 (enum section_category
);
118 #ifdef BSS_SECTION_ASM_OP
119 #ifdef ASM_OUTPUT_ALIGNED_BSS
120 static void asm_output_aligned_bss (FILE *, tree
, const char *,
121 unsigned HOST_WIDE_INT
, int)
124 #endif /* BSS_SECTION_ASM_OP */
125 static void mark_weak (tree
);
126 static void output_constant_pool (const char *, tree
);
127 static void handle_vtv_comdat_section (section
*, const_tree
);
129 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
130 section
*text_section
;
131 section
*data_section
;
132 section
*readonly_data_section
;
133 section
*sdata_section
;
134 section
*ctors_section
;
135 section
*dtors_section
;
136 section
*bss_section
;
137 section
*sbss_section
;
139 /* Various forms of common section. All are guaranteed to be nonnull. */
140 section
*tls_comm_section
;
141 section
*comm_section
;
142 section
*lcomm_section
;
144 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
146 section
*bss_noswitch_section
;
148 /* The section that holds the main exception table, when known. The section
149 is set either by the target's init_sections hook or by the first call to
150 switch_to_exception_section. */
151 section
*exception_section
;
153 /* The section that holds the DWARF2 frame unwind information, when known.
154 The section is set either by the target's init_sections hook or by the
155 first call to switch_to_eh_frame_section. */
156 section
*eh_frame_section
;
158 /* asm_out_file's current section. This is NULL if no section has yet
159 been selected or if we lose track of what the current section is. */
162 /* True if code for the current function is currently being directed
163 at the cold section. */
164 bool in_cold_section_p
;
166 /* The following global holds the "function name" for the code in the
167 cold section of a function, if hot/cold function splitting is enabled
168 and there was actually code that went into the cold section. A
169 pseudo function name is needed for the cold section of code for some
170 debugging tools that perform symbolization. */
171 tree cold_function_name
= NULL_TREE
;
173 /* A linked list of all the unnamed sections. */
174 static GTY(()) section
*unnamed_sections
;
176 /* Return a nonzero value if DECL has a section attribute. */
177 #define IN_NAMED_SECTION(DECL) \
178 (VAR_OR_FUNCTION_DECL_P (DECL) && DECL_SECTION_NAME (DECL) != NULL)
180 struct section_hasher
: ggc_ptr_hash
<section
>
182 typedef const char *compare_type
;
184 static hashval_t
hash (section
*);
185 static bool equal (section
*, const char *);
188 /* Hash table of named sections. */
189 static GTY(()) hash_table
<section_hasher
> *section_htab
;
191 struct object_block_hasher
: ggc_ptr_hash
<object_block
>
193 typedef const section
*compare_type
;
195 static hashval_t
hash (object_block
*);
196 static bool equal (object_block
*, const section
*);
199 /* A table of object_blocks, indexed by section. */
200 static GTY(()) hash_table
<object_block_hasher
> *object_block_htab
;
202 /* The next number to use for internal anchor labels. */
203 static GTY(()) int anchor_labelno
;
205 /* A pool of constants that can be shared between functions. */
206 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
208 /* Helper routines for maintaining section_htab. */
211 section_hasher::equal (section
*old
, const char *new_name
)
213 return strcmp (old
->named
.name
, new_name
) == 0;
217 section_hasher::hash (section
*old
)
219 return htab_hash_string (old
->named
.name
);
222 /* Return a hash value for section SECT. */
225 hash_section (section
*sect
)
227 if (sect
->common
.flags
& SECTION_NAMED
)
228 return htab_hash_string (sect
->named
.name
);
229 return sect
->common
.flags
& ~SECTION_DECLARED
;
232 /* Helper routines for maintaining object_block_htab. */
235 object_block_hasher::equal (object_block
*old
, const section
*new_section
)
237 return old
->sect
== new_section
;
241 object_block_hasher::hash (object_block
*old
)
243 return hash_section (old
->sect
);
246 /* Return a new unnamed section with the given fields. */
249 get_unnamed_section (unsigned int flags
, void (*callback
) (const char *),
254 sect
= ggc_alloc
<section
> ();
255 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
256 sect
->unnamed
.callback
= callback
;
257 sect
->unnamed
.data
= data
;
258 sect
->unnamed
.next
= unnamed_sections
;
260 unnamed_sections
= sect
;
264 /* Return a SECTION_NOSWITCH section with the given fields. */
267 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
271 sect
= ggc_alloc
<section
> ();
272 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
273 sect
->noswitch
.callback
= callback
;
278 /* Return the named section structure associated with NAME. Create
279 a new section with the given fields if no such structure exists.
280 When NOT_EXISTING, then fail if the section already exists. Return
281 the existing section if the SECTION_RETAIN bit doesn't match. Set
282 the SECTION_WRITE | SECTION_RELRO bits on the existing section
283 if one of the section flags is SECTION_WRITE | SECTION_RELRO and the
284 other has none of these flags in named sections and either the section
285 hasn't been declared yet or has been declared as writable. */
288 get_section (const char *name
, unsigned int flags
, tree decl
,
291 section
*sect
, **slot
;
293 slot
= section_htab
->find_slot_with_hash (name
, htab_hash_string (name
),
295 flags
|= SECTION_NAMED
;
298 && lookup_attribute ("retain", DECL_ATTRIBUTES (decl
)))
299 flags
|= SECTION_RETAIN
;
302 sect
= ggc_alloc
<section
> ();
303 sect
->named
.common
.flags
= flags
;
304 sect
->named
.name
= ggc_strdup (name
);
305 sect
->named
.decl
= decl
;
311 internal_error ("section already exists: %qs", name
);
314 /* It is fine if one of the sections has SECTION_NOTYPE as long as
315 the other has none of the contrary flags (see the logic at the end
316 of default_section_type_flags, below). */
317 if (((sect
->common
.flags
^ flags
) & SECTION_NOTYPE
)
318 && !((sect
->common
.flags
| flags
)
319 & (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
| SECTION_ENTSIZE
320 | (HAVE_COMDAT_GROUP
? SECTION_LINKONCE
: 0))))
322 sect
->common
.flags
|= SECTION_NOTYPE
;
323 flags
|= SECTION_NOTYPE
;
325 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
326 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
328 /* It is fine if one of the section flags is
329 SECTION_WRITE | SECTION_RELRO and the other has none of these
330 flags (i.e. read-only) in named sections and either the
331 section hasn't been declared yet or has been declared as writable.
332 In that case just make sure the resulting flags are
333 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
335 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
336 == (SECTION_WRITE
| SECTION_RELRO
)
337 && (sect
->common
.flags
338 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
339 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
340 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
341 || (sect
->common
.flags
& SECTION_WRITE
)))
343 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
346 /* If the SECTION_RETAIN bit doesn't match, return and switch
347 to a new section later. */
348 if ((sect
->common
.flags
& SECTION_RETAIN
)
349 != (flags
& SECTION_RETAIN
))
351 /* Sanity check user variables for flag changes. */
352 if (sect
->named
.decl
!= NULL
353 && DECL_P (sect
->named
.decl
)
354 && decl
!= sect
->named
.decl
)
356 if (decl
!= NULL
&& DECL_P (decl
))
357 error ("%+qD causes a section type conflict with %qD",
358 decl
, sect
->named
.decl
);
360 error ("section type conflict with %qD", sect
->named
.decl
);
361 inform (DECL_SOURCE_LOCATION (sect
->named
.decl
),
362 "%qD was declared here", sect
->named
.decl
);
364 else if (decl
!= NULL
&& DECL_P (decl
))
365 error ("%+qD causes a section type conflict", decl
);
367 error ("section type conflict");
368 /* Make sure we don't error about one section multiple times. */
369 sect
->common
.flags
|= SECTION_OVERRIDE
;
375 /* Return true if the current compilation mode benefits from having
376 objects grouped into blocks. */
379 use_object_blocks_p (void)
381 return flag_section_anchors
;
384 /* Return the object_block structure for section SECT. Create a new
385 structure if we haven't created one already. Return null if SECT
386 itself is null. Return also null for mergeable sections since
387 section anchors can't be used in mergeable sections anyway,
388 because the linker might move objects around, and using the
389 object blocks infrastructure in that case is both a waste and a
390 maintenance burden. */
392 static struct object_block
*
393 get_block_for_section (section
*sect
)
395 struct object_block
*block
;
400 if (sect
->common
.flags
& SECTION_MERGE
)
404 = object_block_htab
->find_slot_with_hash (sect
, hash_section (sect
),
409 block
= ggc_cleared_alloc
<object_block
> ();
416 /* Create a symbol with label LABEL and place it at byte offset
417 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
418 is not yet known. LABEL must be a garbage-collected string. */
421 create_block_symbol (const char *label
, struct object_block
*block
,
422 HOST_WIDE_INT offset
)
427 /* Create the extended SYMBOL_REF. */
428 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
429 symbol
= (rtx
) ggc_internal_alloc (size
);
431 /* Initialize the normal SYMBOL_REF fields. */
432 memset (symbol
, 0, size
);
433 PUT_CODE (symbol
, SYMBOL_REF
);
434 PUT_MODE (symbol
, Pmode
);
435 XSTR (symbol
, 0) = label
;
436 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
438 /* Initialize the block_symbol stuff. */
439 SYMBOL_REF_BLOCK (symbol
) = block
;
440 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
445 /* Return a section with a particular name and with whatever SECTION_*
446 flags section_type_flags deems appropriate. The name of the section
447 is taken from NAME if nonnull, otherwise it is taken from DECL's
448 DECL_SECTION_NAME. DECL is the decl associated with the section
449 (see the section comment for details) and RELOC is as for
450 section_type_flags. */
453 get_named_section (tree decl
, const char *name
, int reloc
)
459 gcc_assert (decl
&& DECL_P (decl
) && DECL_SECTION_NAME (decl
));
460 name
= DECL_SECTION_NAME (decl
);
463 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
464 return get_section (name
, flags
, decl
);
467 /* Worker for resolve_unique_section. */
470 set_implicit_section (struct symtab_node
*n
, void *data ATTRIBUTE_UNUSED
)
472 n
->implicit_section
= true;
476 /* If required, set DECL_SECTION_NAME to a unique name. */
479 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
480 int flag_function_or_data_sections
)
482 if (DECL_SECTION_NAME (decl
) == NULL
483 && targetm_common
.have_named_sections
484 && (flag_function_or_data_sections
485 || lookup_attribute ("retain", DECL_ATTRIBUTES (decl
))
486 || DECL_COMDAT_GROUP (decl
)))
488 targetm
.asm_out
.unique_section (decl
, reloc
);
489 if (DECL_SECTION_NAME (decl
))
490 symtab_node::get (decl
)->call_for_symbol_and_aliases
491 (set_implicit_section
, NULL
, true);
495 #ifdef BSS_SECTION_ASM_OP
497 #ifdef ASM_OUTPUT_ALIGNED_BSS
499 /* Utility function for targets to use in implementing
500 ASM_OUTPUT_ALIGNED_BSS.
501 ??? It is believed that this function will work in most cases so such
502 support is localized here. */
505 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
506 const char *name
, unsigned HOST_WIDE_INT size
,
509 switch_to_section (bss_section
);
510 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
511 #ifdef ASM_DECLARE_OBJECT_NAME
512 last_assemble_variable_decl
= decl
;
513 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
515 /* Standard thing is just output label for the object. */
516 ASM_OUTPUT_LABEL (file
, name
);
517 #endif /* ASM_DECLARE_OBJECT_NAME */
518 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
523 #endif /* BSS_SECTION_ASM_OP */
525 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
526 /* Return the hot section for function DECL. Return text_section for
530 hot_function_section (tree decl
)
532 if (decl
!= NULL_TREE
533 && DECL_SECTION_NAME (decl
) != NULL
534 && targetm_common
.have_named_sections
)
535 return get_named_section (decl
, NULL
, 0);
541 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
544 When DECL_SECTION_NAME is non-NULL and it is implicit section and
545 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
546 concatenate the name with NAMED_SECTION_SUFFIX.
547 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
550 get_named_text_section (tree decl
,
551 const char *text_section_name
,
552 const char *named_section_suffix
)
554 if (decl
&& DECL_SECTION_NAME (decl
))
556 if (named_section_suffix
)
558 const char *dsn
= DECL_SECTION_NAME (decl
);
559 const char *stripped_name
;
562 name
= (char *) alloca (strlen (dsn
) + 1);
566 stripped_name
= targetm
.strip_name_encoding (name
);
568 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
569 return get_named_section (decl
, buffer
, 0);
571 else if (symtab_node::get (decl
)->implicit_section
)
575 /* Do not try to split gnu_linkonce functions. This gets somewhat
577 if (DECL_COMDAT_GROUP (decl
) && !HAVE_COMDAT_GROUP
)
579 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
580 name
= targetm
.strip_name_encoding (name
);
581 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
587 return get_named_section (decl
, text_section_name
, 0);
590 /* Choose named function section based on its frequency. */
593 default_function_section (tree decl
, enum node_frequency freq
,
594 bool startup
, bool exit
)
596 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
597 /* Old GNU linkers have buggy --gc-section support, which sometimes
598 results in .gcc_except_table* sections being garbage collected. */
600 && symtab_node::get (decl
)->implicit_section
)
604 if (!flag_reorder_functions
605 || !targetm_common
.have_named_sections
)
607 /* Startup code should go to startup subsection unless it is
608 unlikely executed (this happens especially with function splitting
609 where we can split away unnecessary parts of static constructors. */
610 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
612 /* During LTO the tp_first_run profiling will naturally place all
613 initialization code first. Using separate section is counter-productive
614 because startup only code may call functions which are no longer
617 || !cgraph_node::get (decl
)->tp_first_run
618 || !opt_for_fn (decl
, flag_profile_reorder_functions
))
619 return get_named_text_section (decl
, ".text.startup", NULL
);
624 /* Similarly for exit. */
625 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
626 return get_named_text_section (decl
, ".text.exit", NULL
);
628 /* Group cold functions together, similarly for hot code. */
631 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
632 return get_named_text_section (decl
, ".text.unlikely", NULL
);
633 case NODE_FREQUENCY_HOT
:
634 return get_named_text_section (decl
, ".text.hot", NULL
);
641 /* Return the section for function DECL.
643 If DECL is NULL_TREE, return the text section. We can be passed
644 NULL_TREE under some circumstances by dbxout.cc at least.
646 If FORCE_COLD is true, return cold function section ignoring
647 the frequency info of cgraph_node. */
650 function_section_1 (tree decl
, bool force_cold
)
652 section
*section
= NULL
;
653 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
654 bool startup
= false, exit
= false;
658 struct cgraph_node
*node
= cgraph_node::get (decl
);
662 freq
= node
->frequency
;
663 startup
= node
->only_called_at_startup
;
664 exit
= node
->only_called_at_exit
;
668 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
670 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
671 if (decl
!= NULL_TREE
672 && DECL_SECTION_NAME (decl
) != NULL
)
674 if (targetm
.asm_out
.function_section
)
675 section
= targetm
.asm_out
.function_section (decl
, freq
,
679 return get_named_section (decl
, NULL
, 0);
682 return targetm
.asm_out
.select_section
683 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
684 symtab_node::get (decl
)->definition_alignment ());
686 if (targetm
.asm_out
.function_section
)
687 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
690 return hot_function_section (decl
);
694 /* Return the section for function DECL.
696 If DECL is NULL_TREE, return the text section. We can be passed
697 NULL_TREE under some circumstances by dbxout.cc at least. */
700 function_section (tree decl
)
702 /* Handle cases where function splitting code decides
703 to put function entry point into unlikely executed section
704 despite the fact that the function itself is not cold
705 (i.e. it is called rarely but contains a hot loop that is
706 better to live in hot subsection for the code locality). */
707 return function_section_1 (decl
,
708 first_function_block_is_cold
);
711 /* Return the section for the current function, take IN_COLD_SECTION_P
715 current_function_section (void)
717 return function_section_1 (current_function_decl
, in_cold_section_p
);
720 /* Tell assembler to switch to unlikely-to-be-executed text section. */
723 unlikely_text_section (void)
725 return function_section_1 (current_function_decl
, true);
728 /* When called within a function context, return true if the function
729 has been assigned a cold text section and if SECT is that section.
730 When called outside a function context, return true if SECT is the
731 default cold section. */
734 unlikely_text_section_p (section
*sect
)
736 return sect
== function_section_1 (current_function_decl
, true);
739 /* Switch to the other function partition (if inside of hot section
740 into cold section, otherwise into the hot section). */
743 switch_to_other_text_partition (void)
745 in_cold_section_p
= !in_cold_section_p
;
746 switch_to_section (current_function_section ());
749 /* Return the read-only or relocated read-only data section
750 associated with function DECL. */
753 default_function_rodata_section (tree decl
, bool relocatable
)
762 sname
= ".data.rel.ro.local";
763 flags
= (SECTION_WRITE
| SECTION_RELRO
);
768 if (decl
&& DECL_SECTION_NAME (decl
))
770 const char *name
= DECL_SECTION_NAME (decl
);
772 if (DECL_COMDAT_GROUP (decl
) && HAVE_COMDAT_GROUP
)
778 dot
= strchr (name
+ 1, '.');
781 len
= strlen (dot
) + strlen (sname
) + 1;
782 rname
= (char *) alloca (len
);
784 strcpy (rname
, sname
);
786 return get_section (rname
, (SECTION_LINKONCE
| flags
), decl
);
788 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo or
789 .gnu.linkonce.d.rel.ro.local.foo if the jump table is relocatable. */
790 else if (DECL_COMDAT_GROUP (decl
)
791 && startswith (name
, ".gnu.linkonce.t."))
798 len
= strlen (name
) + strlen (".rel.ro.local") + 1;
799 rname
= (char *) alloca (len
);
801 strcpy (rname
, ".gnu.linkonce.d.rel.ro.local");
802 strcat (rname
, name
+ 15);
806 len
= strlen (name
) + 1;
807 rname
= (char *) alloca (len
);
809 memcpy (rname
, name
, len
);
812 return get_section (rname
, (SECTION_LINKONCE
| flags
), decl
);
814 /* For .text.foo we want to use .rodata.foo. */
815 else if (flag_function_sections
&& flag_data_sections
816 && startswith (name
, ".text."))
818 size_t len
= strlen (name
) + 1;
819 char *rname
= (char *) alloca (len
+ strlen (sname
) - 5);
821 memcpy (rname
, sname
, strlen (sname
));
822 memcpy (rname
+ strlen (sname
), name
+ 5, len
- 5);
823 return get_section (rname
, flags
, decl
);
828 return get_section (sname
, flags
, decl
);
830 return readonly_data_section
;
833 /* Return the read-only data section associated with function DECL
834 for targets where that section should be always the single
835 readonly data section. */
838 default_no_function_rodata_section (tree
, bool)
840 return readonly_data_section
;
843 /* A subroutine of mergeable_string_section and mergeable_constant_section. */
846 function_mergeable_rodata_prefix (void)
848 section
*s
= targetm
.asm_out
.function_rodata_section (current_function_decl
,
850 if (SECTION_STYLE (s
) == SECTION_NAMED
)
851 return s
->named
.name
;
853 return targetm
.asm_out
.mergeable_rodata_prefix
;
856 /* Return the section to use for string merging. */
859 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
860 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
861 unsigned int flags ATTRIBUTE_UNUSED
)
865 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
866 && TREE_CODE (decl
) == STRING_CST
867 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
869 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
870 && TREE_STRING_LENGTH (decl
) == len
)
872 scalar_int_mode mode
;
873 unsigned int modesize
;
877 const char *prefix
= function_mergeable_rodata_prefix ();
878 char *name
= (char *) alloca (strlen (prefix
) + 30);
880 mode
= SCALAR_INT_TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
881 modesize
= GET_MODE_BITSIZE (mode
);
882 if (modesize
>= 8 && modesize
<= 256
883 && (modesize
& (modesize
- 1)) == 0)
885 if (align
< modesize
)
888 if (!HAVE_LD_ALIGNED_SHF_MERGE
&& align
> 8)
889 return readonly_data_section
;
891 str
= TREE_STRING_POINTER (decl
);
892 unit
= GET_MODE_SIZE (mode
);
894 /* Check for embedded NUL characters. */
895 for (i
= 0; i
< len
; i
+= unit
)
897 for (j
= 0; j
< unit
; j
++)
898 if (str
[i
+ j
] != '\0')
903 if (i
== len
- unit
|| (unit
== 1 && i
== len
))
905 sprintf (name
, "%s.str%d.%d", prefix
,
906 modesize
/ 8, (int) (align
/ 8));
907 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
908 return get_section (name
, flags
, NULL
);
913 return readonly_data_section
;
916 /* Return the section to use for constant merging. */
919 mergeable_constant_section (machine_mode mode ATTRIBUTE_UNUSED
,
920 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
921 unsigned int flags ATTRIBUTE_UNUSED
)
923 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
926 && known_le (GET_MODE_BITSIZE (mode
), align
)
929 && (align
& (align
- 1)) == 0
930 && (HAVE_LD_ALIGNED_SHF_MERGE
? 1 : align
== 8))
932 const char *prefix
= function_mergeable_rodata_prefix ();
933 char *name
= (char *) alloca (strlen (prefix
) + 30);
935 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
936 flags
|= (align
/ 8) | SECTION_MERGE
;
937 return get_section (name
, flags
, NULL
);
939 return readonly_data_section
;
942 /* Given NAME, a putative register name, discard any customary prefixes. */
945 strip_reg_name (const char *name
)
947 #ifdef REGISTER_PREFIX
948 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
949 name
+= strlen (REGISTER_PREFIX
);
951 if (name
[0] == '%' || name
[0] == '#')
956 /* The user has asked for a DECL to have a particular name. Set (or
957 change) it in such a way that we don't prefix an underscore to
960 set_user_assembler_name (tree decl
, const char *name
)
962 char *starred
= (char *) alloca (strlen (name
) + 2);
964 strcpy (starred
+ 1, name
);
965 symtab
->change_decl_assembler_name (decl
, get_identifier (starred
));
966 SET_DECL_RTL (decl
, NULL_RTX
);
969 /* Decode an `asm' spec for a declaration as a register name.
970 Return the register number, or -1 if nothing specified,
971 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
972 or -3 if ASMSPEC is `cc' and is not recognized,
973 or -4 if ASMSPEC is `memory' and is not recognized.
974 Accept an exact spelling or a decimal number.
975 Prefixes such as % are optional. */
978 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
980 /* Presume just one register is clobbered. */
987 /* Get rid of confusing prefixes. */
988 asmspec
= strip_reg_name (asmspec
);
990 /* Allow a decimal number as a "register name". */
991 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
992 if (! ISDIGIT (asmspec
[i
]))
994 if (asmspec
[0] != 0 && i
< 0)
997 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0 && reg_names
[i
][0])
1003 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
1005 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
1008 #ifdef OVERLAPPING_REGISTER_NAMES
1012 const char *const name
;
1015 } table
[] = OVERLAPPING_REGISTER_NAMES
;
1017 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
1018 if (table
[i
].name
[0]
1019 && ! strcmp (asmspec
, table
[i
].name
))
1021 *pnregs
= table
[i
].nregs
;
1022 return table
[i
].number
;
1025 #endif /* OVERLAPPING_REGISTER_NAMES */
1027 #ifdef ADDITIONAL_REGISTER_NAMES
1029 static const struct { const char *const name
; const int number
; } table
[]
1030 = ADDITIONAL_REGISTER_NAMES
;
1032 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
1033 if (table
[i
].name
[0]
1034 && ! strcmp (asmspec
, table
[i
].name
)
1035 && reg_names
[table
[i
].number
][0])
1036 return table
[i
].number
;
1038 #endif /* ADDITIONAL_REGISTER_NAMES */
1040 if (!strcmp (asmspec
, "memory"))
1043 if (!strcmp (asmspec
, "cc"))
1053 decode_reg_name (const char *name
)
1056 return decode_reg_name_and_count (name
, &count
);
1060 /* Return true if DECL's initializer is suitable for a BSS section. */
1063 bss_initializer_p (const_tree decl
, bool named
)
1065 /* Do not put non-common constants into the .bss section, they belong in
1066 a readonly section, except when NAMED is true. */
1067 return ((!TREE_READONLY (decl
) || DECL_COMMON (decl
) || named
)
1068 && (DECL_INITIAL (decl
) == NULL
1069 /* In LTO we have no errors in program; error_mark_node is used
1070 to mark offlined constructors. */
1071 || (DECL_INITIAL (decl
) == error_mark_node
1073 || (flag_zero_initialized_in_bss
1074 && initializer_zerop (DECL_INITIAL (decl
))
1075 /* A decl with the "persistent" attribute applied and
1076 explicitly initialized to 0 should not be treated as a BSS
1078 && !DECL_PERSISTENT_P (decl
))));
1081 /* Compute the alignment of variable specified by DECL.
1082 DONT_OUTPUT_DATA is from assemble_variable. */
1085 align_variable (tree decl
, bool dont_output_data
)
1087 unsigned int align
= DECL_ALIGN (decl
);
1089 /* In the case for initialing an array whose length isn't specified,
1090 where we have not yet been able to do the layout,
1091 figure out the proper alignment now. */
1092 if (dont_output_data
&& DECL_SIZE (decl
) == 0
1093 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
1094 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
1096 /* Some object file formats have a maximum alignment which they support.
1097 In particular, a.out format supports a maximum alignment of 4. */
1098 if (align
> MAX_OFILE_ALIGNMENT
)
1100 error ("alignment of %q+D is greater than maximum object "
1101 "file alignment %d", decl
,
1102 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
1103 align
= MAX_OFILE_ALIGNMENT
;
1106 if (! DECL_USER_ALIGN (decl
))
1108 #ifdef DATA_ABI_ALIGNMENT
1109 unsigned int data_abi_align
1110 = DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1111 /* For backwards compatibility, don't assume the ABI alignment for
1113 if (! DECL_THREAD_LOCAL_P (decl
) || data_abi_align
<= BITS_PER_WORD
)
1114 align
= data_abi_align
;
1117 /* On some machines, it is good to increase alignment sometimes.
1118 But as DECL_ALIGN is used both for actually emitting the variable
1119 and for code accessing the variable as guaranteed alignment, we
1120 can only increase the alignment if it is a performance optimization
1121 if the references to it must bind to the current definition. */
1122 if (decl_binds_to_current_def_p (decl
)
1123 && !DECL_VIRTUAL_P (decl
))
1125 #ifdef DATA_ALIGNMENT
1126 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1127 /* Don't increase alignment too much for TLS variables - TLS space
1129 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1132 if (DECL_INITIAL (decl
) != 0
1133 /* In LTO we have no errors in program; error_mark_node is used
1134 to mark offlined constructors. */
1135 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1137 unsigned int const_align
1138 = targetm
.constant_alignment (DECL_INITIAL (decl
), align
);
1139 /* Don't increase alignment too much for TLS variables - TLS
1140 space is too precious. */
1141 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1142 align
= const_align
;
1147 /* Reset the alignment in case we have made it tighter, so we can benefit
1148 from it in get_pointer_alignment. */
1149 SET_DECL_ALIGN (decl
, align
);
1152 /* Return DECL_ALIGN (decl), possibly increased for optimization purposes
1153 beyond what align_variable returned. */
1156 get_variable_align (tree decl
)
1158 unsigned int align
= DECL_ALIGN (decl
);
1160 /* For user aligned vars or static vars align_variable already did
1162 if (DECL_USER_ALIGN (decl
) || !TREE_PUBLIC (decl
))
1165 #ifdef DATA_ABI_ALIGNMENT
1166 if (DECL_THREAD_LOCAL_P (decl
))
1167 align
= DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1170 /* For decls that bind to the current definition, align_variable
1171 did also everything, except for not assuming ABI required alignment
1172 of TLS variables. For other vars, increase the alignment here
1173 as an optimization. */
1174 if (!decl_binds_to_current_def_p (decl
))
1176 /* On some machines, it is good to increase alignment sometimes. */
1177 #ifdef DATA_ALIGNMENT
1178 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1179 /* Don't increase alignment too much for TLS variables - TLS space
1181 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1184 if (DECL_INITIAL (decl
) != 0
1185 /* In LTO we have no errors in program; error_mark_node is used
1186 to mark offlined constructors. */
1187 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1189 unsigned int const_align
1190 = targetm
.constant_alignment (DECL_INITIAL (decl
), align
);
1191 /* Don't increase alignment too much for TLS variables - TLS space
1193 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1194 align
= const_align
;
1201 /* Compute reloc for get_variable_section. The return value
1202 is a mask for which bit 1 indicates a global relocation, and bit 0
1203 indicates a local relocation. */
1206 compute_reloc_for_var (tree decl
)
1210 if (DECL_INITIAL (decl
) == error_mark_node
)
1211 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1212 else if (DECL_INITIAL (decl
))
1213 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1220 /* Return the section into which the given VAR_DECL or CONST_DECL
1221 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1222 section should be used wherever possible. */
1225 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1227 addr_space_t as
= ADDR_SPACE_GENERIC
;
1229 varpool_node
*vnode
= varpool_node::get (decl
);
1232 vnode
= vnode
->ultimate_alias_target ();
1236 if (TREE_TYPE (decl
) != error_mark_node
)
1237 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1239 /* We need the constructor to figure out reloc flag. */
1241 vnode
->get_constructor ();
1243 if (DECL_COMMON (decl
)
1244 && !lookup_attribute ("retain", DECL_ATTRIBUTES (decl
)))
1246 /* If the decl has been given an explicit section name, or it resides
1247 in a non-generic address space, then it isn't common, and shouldn't
1248 be handled as such. */
1249 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1250 && ADDR_SPACE_GENERIC_P (as
));
1251 if (DECL_THREAD_LOCAL_P (decl
))
1252 return tls_comm_section
;
1253 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1254 return comm_section
;
1257 reloc
= compute_reloc_for_var (decl
);
1259 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1260 if (IN_NAMED_SECTION (decl
))
1262 section
*sect
= get_named_section (decl
, NULL
, reloc
);
1264 if ((sect
->common
.flags
& SECTION_BSS
)
1265 && !bss_initializer_p (decl
, true))
1267 error_at (DECL_SOURCE_LOCATION (decl
),
1268 "only zero initializers are allowed in section %qs",
1270 DECL_INITIAL (decl
) = error_mark_node
;
1275 if (ADDR_SPACE_GENERIC_P (as
)
1276 && !DECL_THREAD_LOCAL_P (decl
)
1277 && !DECL_NOINIT_P (decl
)
1278 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1279 && bss_initializer_p (decl
))
1281 if (!TREE_PUBLIC (decl
)
1282 && !((flag_sanitize
& SANITIZE_ADDRESS
)
1283 && asan_protect_global (decl
)))
1284 return lcomm_section
;
1285 if (bss_noswitch_section
)
1286 return bss_noswitch_section
;
1289 return targetm
.asm_out
.select_section (decl
, reloc
,
1290 get_variable_align (decl
));
1293 /* Return the block into which object_block DECL should be placed. */
1295 static struct object_block
*
1296 get_block_for_decl (tree decl
)
1302 /* The object must be defined in this translation unit. */
1303 if (DECL_EXTERNAL (decl
))
1306 /* There's no point using object blocks for something that is
1307 isolated by definition. */
1308 if (DECL_COMDAT_GROUP (decl
))
1312 /* We can only calculate block offsets if the decl has a known
1314 if (DECL_SIZE_UNIT (decl
) == NULL
)
1316 if (!tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
)))
1319 /* Find out which section should contain DECL. We cannot put it into
1320 an object block if it requires a standalone definition. */
1322 align_variable (decl
, 0);
1323 sect
= get_variable_section (decl
, true);
1324 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1327 if (bool (lookup_attribute ("retain", DECL_ATTRIBUTES (decl
)))
1328 != bool (sect
->common
.flags
& SECTION_RETAIN
))
1331 return get_block_for_section (sect
);
1334 /* Make sure block symbol SYMBOL is in block BLOCK. */
1337 change_symbol_block (rtx symbol
, struct object_block
*block
)
1339 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1341 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1342 SYMBOL_REF_BLOCK (symbol
) = block
;
1346 /* Return true if it is possible to put DECL in an object_block. */
1349 use_blocks_for_decl_p (tree decl
)
1351 struct symtab_node
*snode
;
1353 /* Don't create object blocks if each DECL is placed into a separate
1354 section because that will uselessly create a section anchor for
1356 if (flag_data_sections
)
1359 /* Only data DECLs can be placed into object blocks. */
1360 if (!VAR_P (decl
) && TREE_CODE (decl
) != CONST_DECL
)
1363 /* DECL_INITIAL (decl) set to decl is a hack used for some decls that
1364 are never used from code directly and we never want object block handling
1366 if (DECL_INITIAL (decl
) == decl
)
1369 /* If this decl is an alias, then we don't want to emit a
1372 && (snode
= symtab_node::get (decl
)) != NULL
1376 return targetm
.use_blocks_for_decl_p (decl
);
1379 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
1380 until we find an identifier that is not itself a transparent alias.
1381 Modify the alias passed to it by reference (and all aliases on the
1382 way to the ultimate target), such that they do not have to be
1383 followed again, and return the ultimate target of the alias
1387 ultimate_transparent_alias_target (tree
*alias
)
1389 tree target
= *alias
;
1391 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
1393 gcc_assert (TREE_CHAIN (target
));
1394 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
1395 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
1396 && ! TREE_CHAIN (target
));
1403 /* Return true if REGNUM is mentioned in ELIMINABLE_REGS as a from
1407 eliminable_regno_p (int regnum
)
1413 } eliminables
[] = ELIMINABLE_REGS
;
1414 for (size_t i
= 0; i
< ARRAY_SIZE (eliminables
); i
++)
1415 if (regnum
== eliminables
[i
].from
)
1420 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1421 have static storage duration. In other words, it should not be an
1422 automatic variable, including PARM_DECLs.
1424 There is, however, one exception: this function handles variables
1425 explicitly placed in a particular register by the user.
1427 This is never called for PARM_DECL nodes. */
1430 make_decl_rtl (tree decl
)
1432 const char *name
= 0;
1437 /* Check that we are not being given an automatic variable. */
1438 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1439 && TREE_CODE (decl
) != RESULT_DECL
);
1441 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1442 gcc_assert (!VAR_P (decl
)
1443 || TREE_STATIC (decl
)
1444 || TREE_PUBLIC (decl
)
1445 || DECL_EXTERNAL (decl
)
1446 || DECL_REGISTER (decl
));
1448 /* And that we were not given a type or a label. */
1449 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1450 && TREE_CODE (decl
) != LABEL_DECL
);
1452 /* For a duplicate declaration, we can be called twice on the
1453 same DECL node. Don't discard the RTL already made. */
1454 if (DECL_RTL_SET_P (decl
))
1456 /* If the old RTL had the wrong mode, fix the mode. */
1457 x
= DECL_RTL (decl
);
1458 if (GET_MODE (x
) != DECL_MODE (decl
))
1459 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1461 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1464 /* ??? Another way to do this would be to maintain a hashed
1465 table of such critters. Instead of adding stuff to a DECL
1466 to give certain attributes to it, we could use an external
1467 hash map from DECL to set of attributes. */
1469 /* Let the target reassign the RTL if it wants.
1470 This is necessary, for example, when one machine specific
1471 decl attribute overrides another. */
1472 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1474 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1475 on the new decl information. */
1477 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1478 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1479 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1484 /* If this variable belongs to the global constant pool, retrieve the
1485 pre-computed RTL or recompute it in LTO mode. */
1486 if (VAR_P (decl
) && DECL_IN_CONSTANT_POOL (decl
))
1488 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1492 id
= DECL_ASSEMBLER_NAME (decl
);
1493 name
= IDENTIFIER_POINTER (id
);
1495 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1496 && DECL_REGISTER (decl
))
1498 error ("register name not specified for %q+D", decl
);
1500 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1502 const char *asmspec
= name
+1;
1503 machine_mode mode
= DECL_MODE (decl
);
1504 reg_number
= decode_reg_name (asmspec
);
1505 /* First detect errors in declaring global registers. */
1506 if (reg_number
== -1)
1507 error ("register name not specified for %q+D", decl
);
1508 else if (reg_number
< 0)
1509 error ("invalid register name for %q+D", decl
);
1510 else if (mode
== BLKmode
)
1511 error ("data type of %q+D isn%'t suitable for a register",
1513 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1514 error ("the register specified for %q+D cannot be accessed"
1515 " by the current target", decl
);
1516 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1517 error ("the register specified for %q+D is not general enough"
1518 " to be used as a register variable", decl
);
1519 else if (!targetm
.hard_regno_mode_ok (reg_number
, mode
))
1520 error ("register specified for %q+D isn%'t suitable for data type",
1522 else if (reg_number
!= HARD_FRAME_POINTER_REGNUM
1523 && (reg_number
== FRAME_POINTER_REGNUM
1524 #ifdef RETURN_ADDRESS_POINTER_REGNUM
1525 || reg_number
== RETURN_ADDRESS_POINTER_REGNUM
1527 || reg_number
== ARG_POINTER_REGNUM
)
1528 && eliminable_regno_p (reg_number
))
1529 error ("register specified for %q+D is an internal GCC "
1530 "implementation detail", decl
);
1531 /* Now handle properly declared static register variables. */
1536 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1538 DECL_INITIAL (decl
) = 0;
1539 error ("global register variable has initial value");
1541 if (TREE_THIS_VOLATILE (decl
))
1542 warning (OPT_Wvolatile_register_var
,
1543 "optimization may eliminate reads and/or "
1544 "writes to register variables");
1546 /* If the user specified one of the eliminables registers here,
1547 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1548 confused with that register and be eliminated. This usage is
1549 somewhat suspect... */
1551 SET_DECL_RTL (decl
, gen_raw_REG (mode
, reg_number
));
1552 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1553 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1555 if (TREE_STATIC (decl
))
1557 /* Make this register global, so not usable for anything
1559 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1560 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1561 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1563 nregs
= hard_regno_nregs (reg_number
, mode
);
1565 globalize_reg (decl
, reg_number
+ --nregs
);
1568 /* As a register variable, it has no section. */
1571 /* Avoid internal errors from invalid register
1573 SET_DECL_ASSEMBLER_NAME (decl
, NULL_TREE
);
1574 DECL_HARD_REGISTER (decl
) = 0;
1575 /* Also avoid SSA inconsistencies by pretending this is an external
1577 DECL_EXTERNAL (decl
) = 1;
1580 /* Now handle ordinary static variables and functions (in memory).
1581 Also handle vars declared register invalidly. */
1582 else if (name
[0] == '*')
1584 #ifdef REGISTER_PREFIX
1585 if (strlen (REGISTER_PREFIX
) != 0)
1587 reg_number
= decode_reg_name (name
);
1588 if (reg_number
>= 0 || reg_number
== -3)
1589 error ("register name given for non-register variable %q+D", decl
);
1594 /* Specifying a section attribute on a variable forces it into a
1595 non-.bss section, and thus it cannot be common. */
1596 /* FIXME: In general this code should not be necessary because
1597 visibility pass is doing the same work. But notice_global_symbol
1598 is called early and it needs to make DECL_RTL to get the name.
1599 we take care of recomputing the DECL_RTL after visibility is changed. */
1601 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
))
1602 && DECL_SECTION_NAME (decl
) != NULL
1603 && DECL_INITIAL (decl
) == NULL_TREE
1604 && DECL_COMMON (decl
))
1605 DECL_COMMON (decl
) = 0;
1607 /* Variables can't be both common and weak. */
1608 if (VAR_P (decl
) && DECL_WEAK (decl
))
1609 DECL_COMMON (decl
) = 0;
1611 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1612 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1615 machine_mode address_mode
= Pmode
;
1616 if (TREE_TYPE (decl
) != error_mark_node
)
1618 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1619 address_mode
= targetm
.addr_space
.address_mode (as
);
1621 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1623 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1624 SET_SYMBOL_REF_DECL (x
, decl
);
1626 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1627 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1628 set_mem_attributes (x
, decl
, 1);
1629 SET_DECL_RTL (decl
, x
);
1631 /* Optionally set flags or add text to the name to record information
1632 such as that it is a function name.
1633 If the name is changed, the macro ASM_OUTPUT_LABELREF
1634 will have to know how to strip this information. */
1635 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1638 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1639 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1643 make_decl_rtl_for_debug (tree decl
)
1645 unsigned int save_aliasing_flag
;
1648 if (DECL_RTL_SET_P (decl
))
1649 return DECL_RTL (decl
);
1651 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1652 call new_alias_set. If running with -fcompare-debug, sometimes
1653 we do not want to create alias sets that will throw the alias
1654 numbers off in the comparison dumps. So... clearing
1655 flag_strict_aliasing will keep new_alias_set() from creating a
1657 save_aliasing_flag
= flag_strict_aliasing
;
1658 flag_strict_aliasing
= 0;
1660 rtl
= DECL_RTL (decl
);
1661 /* Reset DECL_RTL back, as various parts of the compiler expects
1662 DECL_RTL set meaning it is actually going to be output. */
1663 SET_DECL_RTL (decl
, NULL
);
1665 flag_strict_aliasing
= save_aliasing_flag
;
1669 /* Output a string of literal assembler code
1670 for an `asm' keyword used between functions. */
1673 assemble_asm (tree string
)
1678 if (TREE_CODE (string
) == ADDR_EXPR
)
1679 string
= TREE_OPERAND (string
, 0);
1681 p
= TREE_STRING_POINTER (string
);
1682 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1685 /* Write the address of the entity given by SYMBOL to SEC. */
1687 assemble_addr_to_section (rtx symbol
, section
*sec
)
1689 switch_to_section (sec
);
1690 assemble_align (POINTER_SIZE
);
1691 assemble_integer (symbol
, POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
1694 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1695 not) section for PRIORITY. */
1697 get_cdtor_priority_section (int priority
, bool constructor_p
)
1699 /* Buffer conservatively large enough for the full range of a 32-bit
1700 int plus the text below. */
1703 /* ??? This only works reliably with the GNU linker. */
1704 sprintf (buf
, "%s.%.5u",
1705 constructor_p
? ".ctors" : ".dtors",
1706 /* Invert the numbering so the linker puts us in the proper
1707 order; constructors are run from right to left, and the
1708 linker sorts in increasing order. */
1709 MAX_INIT_PRIORITY
- priority
);
1710 return get_section (buf
, SECTION_WRITE
, NULL
);
1714 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1718 if (priority
!= DEFAULT_INIT_PRIORITY
)
1719 sec
= get_cdtor_priority_section (priority
,
1720 /*constructor_p=*/false);
1722 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1724 assemble_addr_to_section (symbol
, sec
);
1727 #ifdef DTORS_SECTION_ASM_OP
1729 default_dtor_section_asm_out_destructor (rtx symbol
,
1730 int priority ATTRIBUTE_UNUSED
)
1732 assemble_addr_to_section (symbol
, dtors_section
);
1737 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1741 if (priority
!= DEFAULT_INIT_PRIORITY
)
1742 sec
= get_cdtor_priority_section (priority
,
1743 /*constructor_p=*/true);
1745 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1747 assemble_addr_to_section (symbol
, sec
);
1750 #ifdef CTORS_SECTION_ASM_OP
1752 default_ctor_section_asm_out_constructor (rtx symbol
,
1753 int priority ATTRIBUTE_UNUSED
)
1755 assemble_addr_to_section (symbol
, ctors_section
);
1759 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1760 a nonzero value if the constant pool should be output before the
1761 start of the function, or a zero value if the pool should output
1762 after the end of the function. The default is to put it before the
1765 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1766 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1769 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1770 to be output to assembler.
1771 Set first_global_object_name and weak_global_object_name as appropriate. */
1774 notice_global_symbol (tree decl
)
1776 const char **t
= &first_global_object_name
;
1778 if (first_global_object_name
1779 || !TREE_PUBLIC (decl
)
1780 || DECL_EXTERNAL (decl
)
1781 || !DECL_NAME (decl
)
1782 || (VAR_P (decl
) && DECL_HARD_REGISTER (decl
))
1783 || (TREE_CODE (decl
) != FUNCTION_DECL
1785 || (DECL_COMMON (decl
)
1786 && (DECL_INITIAL (decl
) == 0
1787 || DECL_INITIAL (decl
) == error_mark_node
)))))
1790 /* We win when global object is found, but it is useful to know about weak
1791 symbol as well so we can produce nicer unique names. */
1792 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1793 t
= &weak_global_object_name
;
1797 tree id
= DECL_ASSEMBLER_NAME (decl
);
1798 ultimate_transparent_alias_target (&id
);
1799 *t
= ggc_strdup (targetm
.strip_name_encoding (IDENTIFIER_POINTER (id
)));
1803 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1804 current function goes into the cold section, so that targets can use
1805 current_function_section during RTL expansion. DECL describes the
1809 decide_function_section (tree decl
)
1811 first_function_block_is_cold
= false;
1813 if (DECL_SECTION_NAME (decl
))
1815 struct cgraph_node
*node
= cgraph_node::get (current_function_decl
);
1816 /* Calls to function_section rely on first_function_block_is_cold
1818 first_function_block_is_cold
= (node
1820 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1823 in_cold_section_p
= first_function_block_is_cold
;
1826 /* Get the function's name, as described by its RTL. This may be
1827 different from the DECL_NAME name used in the source file. */
1829 get_fnname_from_decl (tree decl
)
1831 rtx x
= DECL_RTL (decl
);
1832 gcc_assert (MEM_P (x
));
1834 gcc_assert (GET_CODE (x
) == SYMBOL_REF
);
1838 /* Output assembler code for the constant pool of a function and associated
1839 with defining the name of the function. DECL describes the function.
1840 NAME is the function's name. For the constant pool, we use the current
1841 constant pool data. */
1844 assemble_start_function (tree decl
, const char *fnname
)
1847 char tmp_label
[100];
1848 bool hot_label_written
= false;
1850 if (crtl
->has_bb_partition
)
1852 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1853 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1854 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1855 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1856 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1857 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1858 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1859 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1861 cold_function_name
= NULL_TREE
;
1865 crtl
->subsections
.hot_section_label
= NULL
;
1866 crtl
->subsections
.cold_section_label
= NULL
;
1867 crtl
->subsections
.hot_section_end_label
= NULL
;
1868 crtl
->subsections
.cold_section_end_label
= NULL
;
1871 /* The following code does not need preprocessing in the assembler. */
1875 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1876 output_constant_pool (fnname
, decl
);
1878 align
= symtab_node::get (decl
)->definition_alignment ();
1880 /* Make sure the not and cold text (code) sections are properly
1881 aligned. This is necessary here in the case where the function
1882 has both hot and cold sections, because we don't want to re-set
1883 the alignment when the section switch happens mid-function. */
1885 if (crtl
->has_bb_partition
)
1887 first_function_block_is_cold
= false;
1889 switch_to_section (unlikely_text_section ());
1890 assemble_align (align
);
1891 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1893 /* When the function starts with a cold section, we need to explicitly
1894 align the hot section and write out the hot section label.
1895 But if the current function is a thunk, we do not have a CFG. */
1897 && BB_PARTITION (ENTRY_BLOCK_PTR_FOR_FN (cfun
)->next_bb
) == BB_COLD_PARTITION
)
1899 switch_to_section (text_section
);
1900 assemble_align (align
);
1901 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1902 hot_label_written
= true;
1903 first_function_block_is_cold
= true;
1905 in_cold_section_p
= first_function_block_is_cold
;
1909 /* Switch to the correct text section for the start of the function. */
1911 switch_to_section (function_section (decl
), decl
);
1912 if (crtl
->has_bb_partition
&& !hot_label_written
)
1913 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1915 /* Tell assembler to move to target machine's alignment for functions. */
1916 align
= floor_log2 (align
/ BITS_PER_UNIT
);
1919 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1922 /* Handle a user-specified function alignment.
1923 Note that we still need to align to DECL_ALIGN, as above,
1924 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1925 if (! DECL_USER_ALIGN (decl
)
1926 && align_functions
.levels
[0].log
> align
1927 && optimize_function_for_speed_p (cfun
))
1929 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1930 int align_log
= align_functions
.levels
[0].log
;
1932 int max_skip
= align_functions
.levels
[0].maxskip
;
1933 if (flag_limit_function_alignment
&& crtl
->max_insn_address
> 0
1934 && max_skip
>= crtl
->max_insn_address
)
1935 max_skip
= crtl
->max_insn_address
- 1;
1937 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1938 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
, align_log
, max_skip
);
1939 if (max_skip
== align_functions
.levels
[0].maxskip
)
1940 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1941 align_functions
.levels
[1].log
,
1942 align_functions
.levels
[1].maxskip
);
1944 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions
.levels
[0].log
);
1948 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1949 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1952 if (!DECL_IGNORED_P (decl
))
1953 (*debug_hooks
->begin_function
) (decl
);
1955 /* Make function name accessible from other files, if appropriate. */
1957 if (TREE_PUBLIC (decl
))
1959 notice_global_symbol (decl
);
1961 globalize_decl (decl
);
1963 maybe_assemble_visibility (decl
);
1966 if (DECL_PRESERVE_P (decl
))
1967 targetm
.asm_out
.mark_decl_preserved (fnname
);
1969 unsigned short patch_area_size
= crtl
->patch_area_size
;
1970 unsigned short patch_area_entry
= crtl
->patch_area_entry
;
1972 /* Emit the patching area before the entry label, if any. */
1973 if (patch_area_entry
> 0)
1974 targetm
.asm_out
.print_patchable_function_entry (asm_out_file
,
1975 patch_area_entry
, true);
1977 /* Do any machine/system dependent processing of the function name. */
1978 #ifdef ASM_DECLARE_FUNCTION_NAME
1979 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1981 /* Standard thing is just output label for the function. */
1982 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1983 #endif /* ASM_DECLARE_FUNCTION_NAME */
1985 /* And the area after the label. Record it if we haven't done so yet. */
1986 if (patch_area_size
> patch_area_entry
)
1987 targetm
.asm_out
.print_patchable_function_entry (asm_out_file
,
1990 patch_area_entry
== 0);
1992 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1993 saw_no_split_stack
= true;
1996 /* Output assembler code associated with defining the size of the
1997 function. DECL describes the function. NAME is the function's name. */
2000 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
2002 #ifdef ASM_DECLARE_FUNCTION_SIZE
2003 /* We could have switched section in the middle of the function. */
2004 if (crtl
->has_bb_partition
)
2005 switch_to_section (function_section (decl
));
2006 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
2008 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
2010 output_constant_pool (fnname
, decl
);
2011 switch_to_section (function_section (decl
)); /* need to switch back */
2013 /* Output labels for end of hot/cold text sections (to be used by
2015 if (crtl
->has_bb_partition
)
2017 section
*save_text_section
;
2019 save_text_section
= in_section
;
2020 switch_to_section (unlikely_text_section ());
2021 #ifdef ASM_DECLARE_COLD_FUNCTION_SIZE
2022 if (cold_function_name
!= NULL_TREE
)
2023 ASM_DECLARE_COLD_FUNCTION_SIZE (asm_out_file
,
2024 IDENTIFIER_POINTER (cold_function_name
),
2027 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
2028 if (first_function_block_is_cold
)
2029 switch_to_section (text_section
);
2031 switch_to_section (function_section (decl
));
2032 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
2033 switch_to_section (save_text_section
);
2037 /* Assemble code to leave SIZE bytes of zeros. */
2040 assemble_zeros (unsigned HOST_WIDE_INT size
)
2042 /* Do no output if -fsyntax-only. */
2043 if (flag_syntax_only
)
2046 #ifdef ASM_NO_SKIP_IN_TEXT
2047 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
2048 so we must output 0s explicitly in the text section. */
2049 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
2051 unsigned HOST_WIDE_INT i
;
2052 for (i
= 0; i
< size
; i
++)
2053 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
2058 ASM_OUTPUT_SKIP (asm_out_file
, size
);
2061 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
2064 assemble_align (unsigned int align
)
2066 if (align
> BITS_PER_UNIT
)
2068 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
2072 /* Assemble a string constant with the specified C string as contents. */
2075 assemble_string (const char *p
, int size
)
2080 /* If the string is very long, split it up. */
2084 int thissize
= size
- pos
;
2085 if (thissize
> maximum
)
2088 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
2096 /* A noswitch_section_callback for lcomm_section. */
2099 emit_local (tree decl ATTRIBUTE_UNUSED
,
2100 const char *name ATTRIBUTE_UNUSED
,
2101 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
2102 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2104 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
2105 unsigned int align
= symtab_node::get (decl
)->definition_alignment ();
2106 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
2109 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
2110 unsigned int align
= symtab_node::get (decl
)->definition_alignment ();
2111 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, align
);
2114 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2119 /* A noswitch_section_callback for bss_noswitch_section. */
2121 #if defined ASM_OUTPUT_ALIGNED_BSS
2123 emit_bss (tree decl ATTRIBUTE_UNUSED
,
2124 const char *name ATTRIBUTE_UNUSED
,
2125 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
2126 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2128 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
,
2129 get_variable_align (decl
));
2134 /* A noswitch_section_callback for comm_section. */
2137 emit_common (tree decl ATTRIBUTE_UNUSED
,
2138 const char *name ATTRIBUTE_UNUSED
,
2139 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
2140 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2142 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
2143 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
2144 size
, get_variable_align (decl
));
2146 #elif defined ASM_OUTPUT_ALIGNED_COMMON
2147 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
,
2148 get_variable_align (decl
));
2151 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
2156 /* A noswitch_section_callback for tls_comm_section. */
2159 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
2160 const char *name ATTRIBUTE_UNUSED
,
2161 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
2162 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2164 #ifdef ASM_OUTPUT_TLS_COMMON
2165 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
2168 sorry ("thread-local COMMON data not implemented");
2173 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
2174 NAME is the name of DECL's SYMBOL_REF. */
2177 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
,
2180 unsigned HOST_WIDE_INT size
, rounded
;
2182 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2185 if ((flag_sanitize
& SANITIZE_ADDRESS
) && asan_protect_global (decl
))
2186 size
+= asan_red_zone_size (size
);
2188 /* Don't allocate zero bytes of common,
2189 since that means "undefined external" in the linker. */
2193 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2194 so that each uninitialized object starts on such a boundary. */
2195 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
2196 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2197 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2199 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
2200 && (unsigned HOST_WIDE_INT
) (align
/ BITS_PER_UNIT
) > rounded
)
2201 error ("requested alignment for %q+D is greater than "
2202 "implemented alignment of %wu", decl
, rounded
);
2205 /* A subroutine of assemble_variable. Output the label and contents of
2206 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
2207 is as for assemble_variable. */
2210 assemble_variable_contents (tree decl
, const char *name
,
2211 bool dont_output_data
, bool merge_strings
)
2213 /* Do any machine/system dependent processing of the object. */
2214 #ifdef ASM_DECLARE_OBJECT_NAME
2215 last_assemble_variable_decl
= decl
;
2216 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
2218 /* Standard thing is just output label for the object. */
2219 ASM_OUTPUT_LABEL (asm_out_file
, name
);
2220 #endif /* ASM_DECLARE_OBJECT_NAME */
2222 if (!dont_output_data
)
2224 /* Caller is supposed to use varpool_get_constructor when it wants
2225 to output the body. */
2226 gcc_assert (!in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
);
2227 if (DECL_INITIAL (decl
)
2228 && DECL_INITIAL (decl
) != error_mark_node
2229 && !initializer_zerop (DECL_INITIAL (decl
)))
2230 /* Output the actual data. */
2231 output_constant (DECL_INITIAL (decl
),
2232 tree_to_uhwi (DECL_SIZE_UNIT (decl
)),
2233 get_variable_align (decl
),
2234 false, merge_strings
);
2236 /* Leave space for it. */
2237 assemble_zeros (tree_to_uhwi (DECL_SIZE_UNIT (decl
)));
2238 targetm
.asm_out
.decl_end ();
2242 /* Write out assembly for the variable DECL, which is not defined in
2243 the current translation unit. */
2245 assemble_undefined_decl (tree decl
)
2247 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
2248 targetm
.asm_out
.assemble_undefined_decl (asm_out_file
, name
, decl
);
2251 /* Assemble everything that is needed for a variable or function declaration.
2252 Not used for automatic variables, and not used for function definitions.
2253 Should not be called for variables of incomplete structure type.
2255 TOP_LEVEL is nonzero if this variable has file scope.
2256 AT_END is nonzero if this is the special handling, at end of compilation,
2257 to define things that have had only tentative definitions.
2258 DONT_OUTPUT_DATA if nonzero means don't actually output the
2259 initial value (that will be done by the caller). */
2262 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
2263 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
2266 rtx decl_rtl
, symbol
;
2269 bool asan_protected
= false;
2271 /* This function is supposed to handle VARIABLES. Ensure we have one. */
2272 gcc_assert (VAR_P (decl
));
2274 /* Emulated TLS had better not get this far. */
2275 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
2277 last_assemble_variable_decl
= 0;
2279 /* Normally no need to say anything here for external references,
2280 since assemble_external is called by the language-specific code
2281 when a declaration is first seen. */
2283 if (DECL_EXTERNAL (decl
))
2286 /* Do nothing for global register variables. */
2287 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
2289 TREE_ASM_WRITTEN (decl
) = 1;
2293 /* If type was incomplete when the variable was declared,
2294 see if it is complete now. */
2296 if (DECL_SIZE (decl
) == 0)
2297 layout_decl (decl
, 0);
2299 /* Still incomplete => don't allocate it; treat the tentative defn
2300 (which is what it must have been) as an `extern' reference. */
2302 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2304 error ("storage size of %q+D isn%'t known", decl
);
2305 TREE_ASM_WRITTEN (decl
) = 1;
2309 /* The first declaration of a variable that comes through this function
2310 decides whether it is global (in C, has external linkage)
2311 or local (in C, has internal linkage). So do nothing more
2312 if this function has already run. */
2314 if (TREE_ASM_WRITTEN (decl
))
2317 /* Make sure targetm.encode_section_info is invoked before we set
2319 decl_rtl
= DECL_RTL (decl
);
2321 TREE_ASM_WRITTEN (decl
) = 1;
2323 /* Do no output if -fsyntax-only. */
2324 if (flag_syntax_only
)
2327 if (! dont_output_data
2328 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
2330 error ("size of variable %q+D is too large", decl
);
2334 gcc_assert (MEM_P (decl_rtl
));
2335 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2336 symbol
= XEXP (decl_rtl
, 0);
2338 /* If this symbol belongs to the tree constant pool, output the constant
2339 if it hasn't already been written. */
2340 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
2342 tree decl
= SYMBOL_REF_DECL (symbol
);
2343 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
2344 output_constant_def_contents (symbol
);
2350 name
= XSTR (symbol
, 0);
2351 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2352 notice_global_symbol (decl
);
2354 /* Compute the alignment of this data. */
2356 align_variable (decl
, dont_output_data
);
2358 if ((flag_sanitize
& SANITIZE_ADDRESS
)
2359 && asan_protect_global (decl
))
2361 asan_protected
= true;
2362 SET_DECL_ALIGN (decl
, MAX (DECL_ALIGN (decl
),
2363 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
));
2366 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2368 align
= get_variable_align (decl
);
2370 if (TREE_PUBLIC (decl
))
2371 maybe_assemble_visibility (decl
);
2373 if (DECL_PRESERVE_P (decl
))
2374 targetm
.asm_out
.mark_decl_preserved (name
);
2376 /* First make the assembler name(s) global if appropriate. */
2377 sect
= get_variable_section (decl
, false);
2378 if (TREE_PUBLIC (decl
)
2379 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2380 globalize_decl (decl
);
2382 /* Output any data that we will need to use the address of. */
2383 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2384 output_addressed_constants (DECL_INITIAL (decl
), 0);
2386 /* dbxout.cc needs to know this. */
2387 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2388 DECL_IN_TEXT_SECTION (decl
) = 1;
2390 /* If the decl is part of an object_block, make sure that the decl
2391 has been positioned within its block, but do not write out its
2392 definition yet. output_object_blocks will do that later. */
2393 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2395 gcc_assert (!dont_output_data
);
2396 place_block_symbol (symbol
);
2398 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2399 assemble_noswitch_variable (decl
, name
, sect
, align
);
2402 /* Special-case handling of vtv comdat sections. */
2403 if (SECTION_STYLE (sect
) == SECTION_NAMED
2404 && (strcmp (sect
->named
.name
, ".vtable_map_vars") == 0))
2405 handle_vtv_comdat_section (sect
, decl
);
2407 switch_to_section (sect
, decl
);
2408 if (align
> BITS_PER_UNIT
)
2409 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
2410 assemble_variable_contents (decl
, name
, dont_output_data
,
2411 (sect
->common
.flags
& SECTION_MERGE
)
2412 && (sect
->common
.flags
& SECTION_STRINGS
));
2415 unsigned HOST_WIDE_INT
int size
2416 = tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2417 assemble_zeros (asan_red_zone_size (size
));
2422 /* Return true if type TYPE contains any pointers. */
2425 contains_pointers_p (tree type
)
2427 switch (TREE_CODE (type
))
2430 case REFERENCE_TYPE
:
2431 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2432 so I'll play safe and return 1. */
2438 case QUAL_UNION_TYPE
:
2441 /* For a type that has fields, see if the fields have pointers. */
2442 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2443 if (TREE_CODE (fields
) == FIELD_DECL
2444 && contains_pointers_p (TREE_TYPE (fields
)))
2450 /* An array type contains pointers if its element type does. */
2451 return contains_pointers_p (TREE_TYPE (type
));
2458 /* We delay assemble_external processing until
2459 the compilation unit is finalized. This is the best we can do for
2460 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2461 it all the way to final. See PR 17982 for further discussion. */
2462 static GTY(()) tree pending_assemble_externals
;
2464 #ifdef ASM_OUTPUT_EXTERNAL
2465 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2466 As a result, assemble_external can be called after the list of externals
2467 is processed and the pointer set destroyed. */
2468 static bool pending_assemble_externals_processed
;
2470 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2471 TREE_LIST in assemble_external. */
2472 static hash_set
<tree
> *pending_assemble_externals_set
;
2474 /* True if DECL is a function decl for which no out-of-line copy exists.
2475 It is assumed that DECL's assembler name has been set. */
2478 incorporeal_function_p (tree decl
)
2480 if (TREE_CODE (decl
) == FUNCTION_DECL
&& fndecl_built_in_p (decl
))
2484 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2485 && ALLOCA_FUNCTION_CODE_P (DECL_FUNCTION_CODE (decl
)))
2488 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2489 /* Atomic or sync builtins which have survived this far will be
2490 resolved externally and therefore are not incorporeal. */
2491 if (startswith (name
, "__builtin_"))
2497 /* Actually do the tests to determine if this is necessary, and invoke
2498 ASM_OUTPUT_EXTERNAL. */
2500 assemble_external_real (tree decl
)
2502 rtx rtl
= DECL_RTL (decl
);
2504 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2505 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2506 && !incorporeal_function_p (decl
))
2508 /* Some systems do require some output. */
2509 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2510 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2516 process_pending_assemble_externals (void)
2518 #ifdef ASM_OUTPUT_EXTERNAL
2520 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2521 assemble_external_real (TREE_VALUE (list
));
2523 pending_assemble_externals
= 0;
2524 pending_assemble_externals_processed
= true;
2525 delete pending_assemble_externals_set
;
2529 /* This TREE_LIST contains any weak symbol declarations waiting
2531 static GTY(()) tree weak_decls
;
2533 /* Output something to declare an external symbol to the assembler,
2534 and qualifiers such as weakness. (Most assemblers don't need
2535 extern declaration, so we normally output nothing.) Do nothing if
2536 DECL is not external. */
2539 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2541 /* Make sure that the ASM_OUT_FILE is open.
2542 If it's not, we should not be calling this function. */
2543 gcc_assert (asm_out_file
);
2545 /* In a perfect world, the following condition would be true.
2546 Sadly, the Go front end emit assembly *from the front end*,
2547 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2549 /* This function should only be called if we are expanding, or have
2551 Ideally, only final.cc would be calling this function, but it is
2552 not clear whether that would break things somehow. See PR 17982
2553 for further discussion. */
2554 gcc_assert (state
== EXPANSION
2555 || state
== FINISHED
);
2558 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2561 /* We want to output annotation for weak and external symbols at
2562 very last to check if they are references or not. */
2564 if (TARGET_SUPPORTS_WEAK
2566 /* TREE_STATIC is a weird and abused creature which is not
2567 generally the right test for whether an entity has been
2568 locally emitted, inlined or otherwise not-really-extern, but
2569 for declarations that can be weak, it happens to be
2571 && !TREE_STATIC (decl
)
2572 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2573 && value_member (decl
, weak_decls
) == NULL_TREE
)
2574 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2576 #ifdef ASM_OUTPUT_EXTERNAL
2577 if (pending_assemble_externals_processed
)
2579 assemble_external_real (decl
);
2583 if (! pending_assemble_externals_set
->add (decl
))
2584 pending_assemble_externals
= tree_cons (NULL
, decl
,
2585 pending_assemble_externals
);
2589 /* Similar, for calling a library function FUN. */
2592 assemble_external_libcall (rtx fun
)
2594 /* Declare library function name external when first used, if nec. */
2595 if (! SYMBOL_REF_USED (fun
))
2597 SYMBOL_REF_USED (fun
) = 1;
2598 targetm
.asm_out
.external_libcall (fun
);
2602 /* Assemble a label named NAME. */
2605 assemble_label (FILE *file
, const char *name
)
2607 ASM_OUTPUT_LABEL (file
, name
);
2610 /* Set the symbol_referenced flag for ID. */
2612 mark_referenced (tree id
)
2614 TREE_SYMBOL_REFERENCED (id
) = 1;
2617 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2619 mark_decl_referenced (tree decl
)
2621 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2623 /* Extern inline functions don't become needed when referenced.
2624 If we know a method will be emitted in other TU and no new
2625 functions can be marked reachable, just use the external
2627 struct cgraph_node
*node
= cgraph_node::get_create (decl
);
2628 if (!DECL_EXTERNAL (decl
)
2629 && !node
->definition
)
2630 node
->mark_force_output ();
2632 else if (VAR_P (decl
))
2634 varpool_node
*node
= varpool_node::get_create (decl
);
2635 /* C++ frontend use mark_decl_references to force COMDAT variables
2636 to be output that might appear dead otherwise. */
2637 node
->force_output
= true;
2639 /* else do nothing - we can get various sorts of CST nodes here,
2640 which do not need to be marked. */
2644 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2645 starts with a *, the rest of NAME is output verbatim. Otherwise
2646 NAME is transformed in a target-specific way (usually by the
2647 addition of an underscore). */
2650 assemble_name_raw (FILE *file
, const char *name
)
2653 fputs (&name
[1], file
);
2655 ASM_OUTPUT_LABELREF (file
, name
);
2658 /* Return NAME that should actually be emitted, looking through
2659 transparent aliases. If NAME refers to an entity that is also
2660 represented as a tree (like a function or variable), mark the entity
2663 assemble_name_resolve (const char *name
)
2665 const char *real_name
= targetm
.strip_name_encoding (name
);
2666 tree id
= maybe_get_identifier (real_name
);
2672 mark_referenced (id
);
2673 ultimate_transparent_alias_target (&id
);
2675 name
= IDENTIFIER_POINTER (id
);
2676 gcc_assert (! TREE_CHAIN (id
));
2682 /* Like assemble_name_raw, but should be used when NAME might refer to
2683 an entity that is also represented as a tree (like a function or
2684 variable). If NAME does refer to such an entity, that entity will
2685 be marked as referenced. */
2688 assemble_name (FILE *file
, const char *name
)
2690 assemble_name_raw (file
, assemble_name_resolve (name
));
2693 /* Allocate SIZE bytes writable static space with a gensym name
2694 and return an RTX to refer to its address. */
2697 assemble_static_space (unsigned HOST_WIDE_INT size
)
2700 const char *namestring
;
2703 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2705 namestring
= ggc_strdup (name
);
2707 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2708 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2710 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2711 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2714 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2715 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2718 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2719 so that each uninitialized object starts on such a boundary. */
2720 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2721 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2722 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2723 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2724 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2725 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2732 /* Assemble the static constant template for function entry trampolines.
2733 This is done at most once per compilation.
2734 Returns an RTX for the address of the template. */
2736 static GTY(()) rtx initial_trampoline
;
2739 assemble_trampoline_template (void)
2746 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2748 if (initial_trampoline
)
2749 return initial_trampoline
;
2751 /* By default, put trampoline templates in read-only data section. */
2753 #ifdef TRAMPOLINE_SECTION
2754 switch_to_section (TRAMPOLINE_SECTION
);
2756 switch_to_section (readonly_data_section
);
2759 /* Write the assembler code to define one. */
2760 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2762 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2764 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2765 targetm
.asm_out
.trampoline_template (asm_out_file
);
2767 /* Record the rtl to refer to it. */
2768 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2769 name
= ggc_strdup (label
);
2770 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2771 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2773 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2774 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2775 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2777 return initial_trampoline
;
2780 /* A and B are either alignments or offsets. Return the minimum alignment
2781 that may be assumed after adding the two together. */
2783 static inline unsigned
2784 min_align (unsigned int a
, unsigned int b
)
2786 return least_bit_hwi (a
| b
);
2789 /* Return the assembler directive for creating a given kind of integer
2790 object. SIZE is the number of bytes in the object and ALIGNED_P
2791 indicates whether it is known to be aligned. Return NULL if the
2792 assembly dialect has no such directive.
2794 The returned string should be printed at the start of a new line and
2795 be followed immediately by the object's initial value. */
2798 integer_asm_op (int size
, int aligned_p
)
2800 struct asm_int_op
*ops
;
2803 ops
= &targetm
.asm_out
.aligned_op
;
2805 ops
= &targetm
.asm_out
.unaligned_op
;
2810 return targetm
.asm_out
.byte_op
;
2838 /* Use directive OP to assemble an integer object X. Print OP at the
2839 start of the line, followed immediately by the value of X. */
2842 assemble_integer_with_op (const char *op
, rtx x
)
2844 fputs (op
, asm_out_file
);
2845 output_addr_const (asm_out_file
, x
);
2846 fputc ('\n', asm_out_file
);
2849 /* The default implementation of the asm_out.integer target hook. */
2852 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2853 unsigned int size ATTRIBUTE_UNUSED
,
2854 int aligned_p ATTRIBUTE_UNUSED
)
2856 const char *op
= integer_asm_op (size
, aligned_p
);
2857 /* Avoid GAS bugs for large values. Specifically negative values whose
2858 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2859 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE_UNITS
)
2861 return op
&& (assemble_integer_with_op (op
, x
), true);
2864 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2865 the alignment of the integer in bits. Return 1 if we were able to output
2866 the constant, otherwise 0. We must be able to output the constant,
2867 if FORCE is nonzero. */
2870 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2874 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2876 /* See if the target hook can handle this kind of object. */
2877 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2880 /* If the object is a multi-byte one, try splitting it up. Split
2881 it into words it if is multi-word, otherwise split it into bytes. */
2884 machine_mode omode
, imode
;
2885 unsigned int subalign
;
2886 unsigned int subsize
, i
;
2887 enum mode_class mclass
;
2889 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2890 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2891 if (GET_CODE (x
) == CONST_FIXED
)
2892 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2896 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0).require ();
2897 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0).require ();
2899 for (i
= 0; i
< size
; i
+= subsize
)
2901 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2902 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2908 /* If we've printed some of it, but not all of it, there's no going
2913 gcc_assert (!force
);
2918 /* Assemble the floating-point constant D into an object of size MODE. ALIGN
2919 is the alignment of the constant in bits. If REVERSE is true, D is output
2920 in reverse storage order. */
2923 assemble_real (REAL_VALUE_TYPE d
, scalar_float_mode mode
, unsigned int align
,
2926 long data
[4] = {0, 0, 0, 0};
2927 int bitsize
, nelts
, nunits
, units_per
;
2930 /* This is hairy. We have a quantity of known size. real_to_target
2931 will put it into an array of *host* longs, 32 bits per element
2932 (even if long is more than 32 bits). We need to determine the
2933 number of array elements that are occupied (nelts) and the number
2934 of *target* min-addressable units that will be occupied in the
2935 object file (nunits). We cannot assume that 32 divides the
2936 mode's bitsize (size * BITS_PER_UNIT) evenly.
2938 size * BITS_PER_UNIT is used here to make sure that padding bits
2939 (which might appear at either end of the value; real_to_target
2940 will include the padding bits in its output array) are included. */
2942 nunits
= GET_MODE_SIZE (mode
);
2943 bitsize
= nunits
* BITS_PER_UNIT
;
2944 nelts
= CEIL (bitsize
, 32);
2945 units_per
= 32 / BITS_PER_UNIT
;
2947 real_to_target (data
, &d
, mode
);
2949 /* Put out the first word with the specified alignment. */
2950 unsigned int chunk_nunits
= MIN (nunits
, units_per
);
2952 elt
= flip_storage_order (SImode
, gen_int_mode (data
[nelts
- 1], SImode
));
2954 elt
= GEN_INT (sext_hwi (data
[0], chunk_nunits
* BITS_PER_UNIT
));
2955 assemble_integer (elt
, chunk_nunits
, align
, 1);
2956 nunits
-= chunk_nunits
;
2958 /* Subsequent words need only 32-bit alignment. */
2959 align
= min_align (align
, 32);
2961 for (int i
= 1; i
< nelts
; i
++)
2963 chunk_nunits
= MIN (nunits
, units_per
);
2965 elt
= flip_storage_order (SImode
,
2966 gen_int_mode (data
[nelts
- 1 - i
], SImode
));
2968 elt
= GEN_INT (sext_hwi (data
[i
], chunk_nunits
* BITS_PER_UNIT
));
2969 assemble_integer (elt
, chunk_nunits
, align
, 1);
2970 nunits
-= chunk_nunits
;
2974 /* Given an expression EXP with a constant value,
2975 reduce it to the sum of an assembler symbol and an integer.
2976 Store them both in the structure *VALUE.
2977 EXP must be reducible. */
2986 decode_addr_const (tree exp
, class addr_const
*value
)
2988 tree target
= TREE_OPERAND (exp
, 0);
2989 poly_int64 offset
= 0;
2995 if (TREE_CODE (target
) == COMPONENT_REF
2996 && poly_int_tree_p (byte_position (TREE_OPERAND (target
, 1)),
3000 target
= TREE_OPERAND (target
, 0);
3002 else if (TREE_CODE (target
) == ARRAY_REF
3003 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
3005 /* Truncate big offset. */
3007 += (TREE_INT_CST_LOW (TYPE_SIZE_UNIT (TREE_TYPE (target
)))
3008 * wi::to_poly_widest (TREE_OPERAND (target
, 1)).force_shwi ());
3009 target
= TREE_OPERAND (target
, 0);
3011 else if (TREE_CODE (target
) == MEM_REF
3012 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
3014 offset
+= mem_ref_offset (target
).force_shwi ();
3015 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
3017 else if (INDIRECT_REF_P (target
)
3018 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
3019 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
3021 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
3026 switch (TREE_CODE (target
))
3030 x
= DECL_RTL (target
);
3034 x
= gen_rtx_MEM (FUNCTION_MODE
,
3035 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
3044 x
= lookup_constant_def (target
);
3045 /* Should have been added by output_addressed_constants. */
3050 /* This deals with absolute addresses. */
3051 offset
+= tree_to_shwi (TREE_OPERAND (target
, 0));
3052 x
= gen_rtx_MEM (QImode
,
3053 gen_rtx_SYMBOL_REF (Pmode
, "origin of addresses"));
3056 case COMPOUND_LITERAL_EXPR
:
3057 gcc_assert (COMPOUND_LITERAL_EXPR_DECL (target
));
3058 x
= DECL_RTL (COMPOUND_LITERAL_EXPR_DECL (target
));
3065 gcc_assert (MEM_P (x
));
3069 value
->offset
= offset
;
3072 static GTY(()) hash_table
<tree_descriptor_hasher
> *const_desc_htab
;
3074 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
3076 /* Constant pool accessor function. */
3078 hash_table
<tree_descriptor_hasher
> *
3079 constant_pool_htab (void)
3081 return const_desc_htab
;
3084 /* Compute a hash code for a constant expression. */
3087 tree_descriptor_hasher::hash (constant_descriptor_tree
*ptr
)
3093 const_hash_1 (const tree exp
)
3098 enum tree_code code
= TREE_CODE (exp
);
3100 /* Either set P and LEN to the address and len of something to hash and
3101 exit the switch or return a value. */
3106 p
= (char *) &TREE_INT_CST_ELT (exp
, 0);
3107 len
= TREE_INT_CST_NUNITS (exp
) * sizeof (HOST_WIDE_INT
);
3111 return real_hash (TREE_REAL_CST_PTR (exp
));
3114 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
3117 p
= TREE_STRING_POINTER (exp
);
3118 len
= TREE_STRING_LENGTH (exp
);
3122 return (const_hash_1 (TREE_REALPART (exp
)) * 5
3123 + const_hash_1 (TREE_IMAGPART (exp
)));
3127 hi
= 7 + VECTOR_CST_NPATTERNS (exp
);
3128 hi
= hi
* 563 + VECTOR_CST_NELTS_PER_PATTERN (exp
);
3129 unsigned int count
= vector_cst_encoded_nelts (exp
);
3130 for (unsigned int i
= 0; i
< count
; ++i
)
3131 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ENCODED_ELT (exp
, i
));
3137 unsigned HOST_WIDE_INT idx
;
3140 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
3142 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
3144 hi
= hi
* 603 + const_hash_1 (value
);
3150 if (CONSTANT_CLASS_P (TREE_OPERAND (exp
, 0)))
3151 return const_hash_1 (TREE_OPERAND (exp
, 0));
3156 class addr_const value
;
3158 decode_addr_const (exp
, &value
);
3159 switch (GET_CODE (value
.base
))
3162 /* Don't hash the address of the SYMBOL_REF;
3163 only use the offset and the symbol name. */
3164 hi
= value
.offset
.coeffs
[0];
3165 p
= XSTR (value
.base
, 0);
3166 for (i
= 0; p
[i
] != 0; i
++)
3167 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3171 hi
= (value
.offset
.coeffs
[0]
3172 + CODE_LABEL_NUMBER (label_ref_label (value
.base
)) * 13);
3182 case POINTER_PLUS_EXPR
:
3184 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
3185 + const_hash_1 (TREE_OPERAND (exp
, 1)));
3188 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
3191 /* A language specific constant. Just hash the code. */
3195 /* Compute hashing function. */
3197 for (i
= 0; i
< len
; i
++)
3198 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3203 /* Wrapper of compare_constant, for the htab interface. */
3205 tree_descriptor_hasher::equal (constant_descriptor_tree
*c1
,
3206 constant_descriptor_tree
*c2
)
3208 if (c1
->hash
!= c2
->hash
)
3210 return compare_constant (c1
->value
, c2
->value
);
3213 /* Compare t1 and t2, and return true only if they are known to result in
3214 the same bit pattern on output. */
3217 compare_constant (const tree t1
, const tree t2
)
3219 enum tree_code typecode
;
3221 if (t1
== NULL_TREE
)
3222 return t2
== NULL_TREE
;
3223 if (t2
== NULL_TREE
)
3226 if (TREE_CODE (t1
) != TREE_CODE (t2
))
3229 switch (TREE_CODE (t1
))
3232 /* Integer constants are the same only if the same width of type. */
3233 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3235 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3237 return tree_int_cst_equal (t1
, t2
);
3240 /* Real constants are the same only if the same width of type. In
3241 addition to the same width, we need to check whether the modes are the
3242 same. There might be two floating point modes that are the same size
3243 but have different representations, such as the PowerPC that has 2
3244 different 128-bit floating point types (IBM extended double and IEEE
3245 128-bit floating point). */
3246 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3248 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3250 return real_identical (&TREE_REAL_CST (t1
), &TREE_REAL_CST (t2
));
3253 /* Fixed constants are the same only if the same width of type. */
3254 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3257 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
3260 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
3261 || int_size_in_bytes (TREE_TYPE (t1
))
3262 != int_size_in_bytes (TREE_TYPE (t2
)))
3265 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
3266 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
3267 TREE_STRING_LENGTH (t1
)));
3270 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
3271 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
3275 if (VECTOR_CST_NPATTERNS (t1
)
3276 != VECTOR_CST_NPATTERNS (t2
))
3279 if (VECTOR_CST_NELTS_PER_PATTERN (t1
)
3280 != VECTOR_CST_NELTS_PER_PATTERN (t2
))
3283 unsigned int count
= vector_cst_encoded_nelts (t1
);
3284 for (unsigned int i
= 0; i
< count
; ++i
)
3285 if (!compare_constant (VECTOR_CST_ENCODED_ELT (t1
, i
),
3286 VECTOR_CST_ENCODED_ELT (t2
, i
)))
3294 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
3295 unsigned HOST_WIDE_INT idx
;
3297 typecode
= TREE_CODE (TREE_TYPE (t1
));
3298 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
3301 if (typecode
== ARRAY_TYPE
)
3303 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
3304 /* For arrays, check that mode, size and storage order match. */
3305 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
3307 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
))
3308 || TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (t1
))
3309 != TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (t2
)))
3314 /* For record and union constructors, require exact type
3316 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
3320 v1
= CONSTRUCTOR_ELTS (t1
);
3321 v2
= CONSTRUCTOR_ELTS (t2
);
3322 if (vec_safe_length (v1
) != vec_safe_length (v2
))
3325 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
3327 constructor_elt
*c1
= &(*v1
)[idx
];
3328 constructor_elt
*c2
= &(*v2
)[idx
];
3330 /* Check that each value is the same... */
3331 if (!compare_constant (c1
->value
, c2
->value
))
3333 /* ... and that they apply to the same fields! */
3334 if (typecode
== ARRAY_TYPE
)
3336 if (!compare_constant (c1
->index
, c2
->index
))
3341 if (c1
->index
!= c2
->index
)
3352 class addr_const value1
, value2
;
3356 decode_addr_const (t1
, &value1
);
3357 decode_addr_const (t2
, &value2
);
3359 if (maybe_ne (value1
.offset
, value2
.offset
))
3362 code
= GET_CODE (value1
.base
);
3363 if (code
!= GET_CODE (value2
.base
))
3369 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3373 ret
= (CODE_LABEL_NUMBER (label_ref_label (value1
.base
))
3374 == CODE_LABEL_NUMBER (label_ref_label (value2
.base
)));
3384 case POINTER_PLUS_EXPR
:
3387 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3388 && compare_constant (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3391 case VIEW_CONVERT_EXPR
:
3392 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3399 /* Return the section into which constant EXP should be placed. */
3402 get_constant_section (tree exp
, unsigned int align
)
3404 return targetm
.asm_out
.select_section (exp
,
3405 compute_reloc_for_constant (exp
),
3409 /* Return the size of constant EXP in bytes. */
3411 static HOST_WIDE_INT
3412 get_constant_size (tree exp
)
3416 size
= int_size_in_bytes (TREE_TYPE (exp
));
3417 gcc_checking_assert (size
>= 0);
3418 gcc_checking_assert (TREE_CODE (exp
) != STRING_CST
3419 || size
>= TREE_STRING_LENGTH (exp
));
3423 /* Subroutine of output_constant_def:
3424 No constant equal to EXP is known to have been output.
3425 Make a constant descriptor to enter EXP in the hash table.
3426 Assign the label number and construct RTL to refer to the
3427 constant's location in memory.
3428 Caller is responsible for updating the hash table. */
3430 static struct constant_descriptor_tree
*
3431 build_constant_desc (tree exp
)
3433 struct constant_descriptor_tree
*desc
;
3439 desc
= ggc_alloc
<constant_descriptor_tree
> ();
3442 /* Create a string containing the label name, in LABEL. */
3443 labelno
= const_labelno
++;
3444 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3446 /* Construct the VAR_DECL associated with the constant. */
3447 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3449 DECL_ARTIFICIAL (decl
) = 1;
3450 DECL_IGNORED_P (decl
) = 1;
3451 TREE_READONLY (decl
) = 1;
3452 TREE_STATIC (decl
) = 1;
3453 TREE_ADDRESSABLE (decl
) = 1;
3454 /* We don't set the RTL yet as this would cause varpool to assume that the
3455 variable is referenced. Moreover, it would just be dropped in LTO mode.
3456 Instead we set the flag that will be recognized in make_decl_rtl. */
3457 DECL_IN_CONSTANT_POOL (decl
) = 1;
3458 DECL_INITIAL (decl
) = desc
->value
;
3459 /* ??? targetm.constant_alignment hasn't been updated for vector types on
3460 most architectures so use DATA_ALIGNMENT as well, except for strings. */
3461 if (TREE_CODE (exp
) == STRING_CST
)
3462 SET_DECL_ALIGN (decl
, targetm
.constant_alignment (exp
, DECL_ALIGN (decl
)));
3465 align_variable (decl
, 0);
3466 if (DECL_ALIGN (decl
) < GET_MODE_ALIGNMENT (DECL_MODE (decl
))
3467 && ((optab_handler (movmisalign_optab
, DECL_MODE (decl
))
3468 != CODE_FOR_nothing
)
3469 || targetm
.slow_unaligned_access (DECL_MODE (decl
),
3470 DECL_ALIGN (decl
))))
3471 SET_DECL_ALIGN (decl
, GET_MODE_ALIGNMENT (DECL_MODE (decl
)));
3474 /* Now construct the SYMBOL_REF and the MEM. */
3475 if (use_object_blocks_p ())
3477 int align
= (TREE_CODE (decl
) == CONST_DECL
3478 || (VAR_P (decl
) && DECL_IN_CONSTANT_POOL (decl
))
3480 : symtab_node::get (decl
)->definition_alignment ());
3481 section
*sect
= get_constant_section (exp
, align
);
3482 symbol
= create_block_symbol (ggc_strdup (label
),
3483 get_block_for_section (sect
), -1);
3486 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3487 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3488 SET_SYMBOL_REF_DECL (symbol
, decl
);
3489 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3491 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3492 set_mem_alias_set (rtl
, 0);
3494 /* Putting EXP into the literal pool might have imposed a different
3495 alignment which should be visible in the RTX as well. */
3496 set_mem_align (rtl
, DECL_ALIGN (decl
));
3498 /* We cannot share RTX'es in pool entries.
3499 Mark this piece of RTL as required for unsharing. */
3500 RTX_FLAG (rtl
, used
) = 1;
3502 /* Set flags or add text to the name to record information, such as
3503 that it is a local symbol. If the name is changed, the macro
3504 ASM_OUTPUT_LABELREF will have to know how to strip this
3505 information. This call might invalidate our local variable
3506 SYMBOL; we can't use it afterward. */
3507 targetm
.encode_section_info (exp
, rtl
, true);
3514 /* Subroutine of output_constant_def and tree_output_constant_def:
3515 Add a constant to the hash table that tracks which constants
3516 already have labels. */
3518 static constant_descriptor_tree
*
3519 add_constant_to_table (tree exp
, int defer
)
3521 /* The hash table methods may call output_constant_def for addressed
3522 constants, so handle them first. */
3523 output_addressed_constants (exp
, defer
);
3525 /* Sanity check to catch recursive insertion. */
3526 static bool inserting
;
3527 gcc_assert (!inserting
);
3530 /* Look up EXP in the table of constant descriptors. If we didn't
3531 find it, create a new one. */
3532 struct constant_descriptor_tree key
;
3534 key
.hash
= const_hash_1 (exp
);
3535 constant_descriptor_tree
**loc
3536 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3540 struct constant_descriptor_tree
*desc
= *loc
;
3543 desc
= build_constant_desc (exp
);
3544 desc
->hash
= key
.hash
;
3551 /* Return an rtx representing a reference to constant data in memory
3552 for the constant expression EXP.
3554 If assembler code for such a constant has already been output,
3555 return an rtx to refer to it.
3556 Otherwise, output such a constant in memory
3557 and generate an rtx for it.
3559 If DEFER is nonzero, this constant can be deferred and output only
3560 if referenced in the function after all optimizations.
3562 `const_desc_table' records which constants already have label strings. */
3565 output_constant_def (tree exp
, int defer
)
3567 struct constant_descriptor_tree
*desc
= add_constant_to_table (exp
, defer
);
3568 maybe_output_constant_def_contents (desc
, defer
);
3572 /* Subroutine of output_constant_def: Decide whether or not we need to
3573 output the constant DESC now, and if so, do it. */
3575 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3578 rtx symbol
= XEXP (desc
->rtl
, 0);
3579 tree exp
= desc
->value
;
3581 if (flag_syntax_only
)
3584 if (TREE_ASM_WRITTEN (exp
))
3585 /* Already output; don't do it again. */
3588 /* We can always defer constants as long as the context allows
3592 /* Increment n_deferred_constants if it exists. It needs to be at
3593 least as large as the number of constants actually referred to
3594 by the function. If it's too small we'll stop looking too early
3595 and fail to emit constants; if it's too large we'll only look
3596 through the entire function when we could have stopped earlier. */
3598 n_deferred_constants
++;
3602 output_constant_def_contents (symbol
);
3605 /* Subroutine of output_constant_def_contents. Output the definition
3606 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3607 constant's alignment in bits. */
3610 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
,
3615 size
= get_constant_size (exp
);
3617 /* Do any machine/system dependent processing of the constant. */
3618 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3620 /* Output the value of EXP. */
3621 output_constant (exp
, size
, align
, false, merge_strings
);
3623 targetm
.asm_out
.decl_end ();
3626 /* We must output the constant data referred to by SYMBOL; do so. */
3629 output_constant_def_contents (rtx symbol
)
3631 tree decl
= SYMBOL_REF_DECL (symbol
);
3632 tree exp
= DECL_INITIAL (decl
);
3633 bool asan_protected
= false;
3635 /* Make sure any other constants whose addresses appear in EXP
3636 are assigned label numbers. */
3637 output_addressed_constants (exp
, 0);
3639 /* We are no longer deferring this constant. */
3640 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3642 if ((flag_sanitize
& SANITIZE_ADDRESS
)
3643 && TREE_CODE (exp
) == STRING_CST
3644 && asan_protect_global (exp
))
3646 asan_protected
= true;
3647 SET_DECL_ALIGN (decl
, MAX (DECL_ALIGN (decl
),
3648 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
));
3651 /* If the constant is part of an object block, make sure that the
3652 decl has been positioned within its block, but do not write out
3653 its definition yet. output_object_blocks will do that later. */
3654 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3655 place_block_symbol (symbol
);
3658 int align
= (TREE_CODE (decl
) == CONST_DECL
3659 || (VAR_P (decl
) && DECL_IN_CONSTANT_POOL (decl
))
3661 : symtab_node::get (decl
)->definition_alignment ());
3662 section
*sect
= get_constant_section (exp
, align
);
3663 switch_to_section (sect
);
3664 if (align
> BITS_PER_UNIT
)
3665 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3666 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
,
3667 (sect
->common
.flags
& SECTION_MERGE
)
3668 && (sect
->common
.flags
& SECTION_STRINGS
));
3671 HOST_WIDE_INT size
= get_constant_size (exp
);
3672 assemble_zeros (asan_red_zone_size (size
));
3677 /* Look up EXP in the table of constant descriptors. Return the rtl
3678 if it has been emitted, else null. */
3681 lookup_constant_def (tree exp
)
3683 struct constant_descriptor_tree key
;
3686 key
.hash
= const_hash_1 (exp
);
3687 constant_descriptor_tree
*desc
3688 = const_desc_htab
->find_with_hash (&key
, key
.hash
);
3690 return (desc
? desc
->rtl
: NULL_RTX
);
3693 /* Return a tree representing a reference to constant data in memory
3694 for the constant expression EXP.
3696 This is the counterpart of output_constant_def at the Tree level. */
3699 tree_output_constant_def (tree exp
)
3701 struct constant_descriptor_tree
*desc
= add_constant_to_table (exp
, 1);
3702 tree decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3703 varpool_node::finalize_decl (decl
);
3707 class GTY((chain_next ("%h.next"), for_user
)) constant_descriptor_rtx
{
3709 class constant_descriptor_rtx
*next
;
3713 HOST_WIDE_INT offset
;
3715 fixed_size_mode mode
;
3721 struct const_rtx_desc_hasher
: ggc_ptr_hash
<constant_descriptor_rtx
>
3723 static hashval_t
hash (constant_descriptor_rtx
*);
3724 static bool equal (constant_descriptor_rtx
*, constant_descriptor_rtx
*);
3727 /* Used in the hash tables to avoid outputting the same constant
3728 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3729 are output once per function, not once per file. */
3730 /* ??? Only a few targets need per-function constant pools. Most
3731 can use one per-file pool. Should add a targetm bit to tell the
3734 struct GTY(()) rtx_constant_pool
{
3735 /* Pointers to first and last constant in pool, as ordered by offset. */
3736 class constant_descriptor_rtx
*first
;
3737 class constant_descriptor_rtx
*last
;
3739 /* Hash facility for making memory-constants from constant rtl-expressions.
3740 It is used on RISC machines where immediate integer arguments and
3741 constant addresses are restricted so that such constants must be stored
3743 hash_table
<const_rtx_desc_hasher
> *const_rtx_htab
;
3745 /* Current offset in constant pool (does not include any
3746 machine-specific header). */
3747 HOST_WIDE_INT offset
;
3750 /* Hash and compare functions for const_rtx_htab. */
3753 const_rtx_desc_hasher::hash (constant_descriptor_rtx
*desc
)
3759 const_rtx_desc_hasher::equal (constant_descriptor_rtx
*x
,
3760 constant_descriptor_rtx
*y
)
3762 if (x
->mode
!= y
->mode
)
3764 return rtx_equal_p (x
->constant
, y
->constant
);
3767 /* Hash one component of a constant. */
3770 const_rtx_hash_1 (const_rtx x
)
3772 unsigned HOST_WIDE_INT hwi
;
3778 code
= GET_CODE (x
);
3779 mode
= GET_MODE (x
);
3780 h
= (hashval_t
) code
* 1048573 + mode
;
3789 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3790 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3792 h
^= (hashval_t
) hwi
;
3793 for (i
= 1; i
< n
; ++i
)
3796 h
^= (hashval_t
) hwi
;
3801 case CONST_WIDE_INT
:
3804 for (i
= 0; i
< CONST_WIDE_INT_NUNITS (x
); i
++)
3805 hwi
^= CONST_WIDE_INT_ELT (x
, i
);
3810 if (TARGET_SUPPORTS_WIDE_INT
== 0 && mode
== VOIDmode
)
3812 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3816 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3820 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3824 h
^= htab_hash_string (XSTR (x
, 0));
3828 h
= h
* 251 + CODE_LABEL_NUMBER (label_ref_label (x
));
3832 case UNSPEC_VOLATILE
:
3833 h
= h
* 251 + XINT (x
, 1);
3843 /* Compute a hash value for X, which should be a constant. */
3846 const_rtx_hash (rtx x
)
3849 subrtx_iterator::array_type array
;
3850 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
3851 h
= h
* 509 + const_rtx_hash_1 (*iter
);
3856 /* Create and return a new rtx constant pool. */
3858 static struct rtx_constant_pool
*
3859 create_constant_pool (void)
3861 struct rtx_constant_pool
*pool
;
3863 pool
= ggc_alloc
<rtx_constant_pool
> ();
3864 pool
->const_rtx_htab
= hash_table
<const_rtx_desc_hasher
>::create_ggc (31);
3871 /* Initialize constant pool hashing for a new function. */
3874 init_varasm_status (void)
3876 crtl
->varasm
.pool
= create_constant_pool ();
3877 crtl
->varasm
.deferred_constants
= 0;
3880 /* Given a MINUS expression, simplify it if both sides
3881 include the same symbol. */
3884 simplify_subtraction (rtx x
)
3886 rtx r
= simplify_rtx (x
);
3890 /* Given a constant rtx X, make (or find) a memory constant for its value
3891 and return a MEM rtx to refer to it in memory. IN_MODE is the mode
3895 force_const_mem (machine_mode in_mode
, rtx x
)
3897 class constant_descriptor_rtx
*desc
, tmp
;
3898 struct rtx_constant_pool
*pool
;
3903 constant_descriptor_rtx
**slot
;
3904 fixed_size_mode mode
;
3906 /* We can't force variable-sized objects to memory. */
3907 if (!is_a
<fixed_size_mode
> (in_mode
, &mode
))
3910 /* If we're not allowed to drop X into the constant pool, don't. */
3911 if (targetm
.cannot_force_const_mem (mode
, x
))
3914 /* Record that this function has used a constant pool entry. */
3915 crtl
->uses_const_pool
= 1;
3917 /* Decide which pool to use. */
3918 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3919 ? shared_constant_pool
3920 : crtl
->varasm
.pool
);
3922 /* Lookup the value in the hashtable. */
3925 hash
= const_rtx_hash (x
);
3926 slot
= pool
->const_rtx_htab
->find_slot_with_hash (&tmp
, hash
, INSERT
);
3929 /* If the constant was already present, return its memory. */
3931 return copy_rtx (desc
->mem
);
3933 /* Otherwise, create a new descriptor. */
3934 desc
= ggc_alloc
<constant_descriptor_rtx
> ();
3937 /* Align the location counter as required by EXP's data type. */
3938 machine_mode align_mode
= (mode
== VOIDmode
? word_mode
: mode
);
3939 align
= targetm
.static_rtx_alignment (align_mode
);
3941 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3942 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3945 desc
->constant
= copy_rtx (tmp
.constant
);
3946 desc
->offset
= pool
->offset
;
3949 desc
->align
= align
;
3950 desc
->labelno
= const_labelno
;
3953 pool
->offset
+= GET_MODE_SIZE (mode
);
3955 pool
->last
->next
= desc
;
3957 pool
->first
= pool
->last
= desc
;
3960 /* Create a string containing the label name, in LABEL. */
3961 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3964 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3965 the constants pool. */
3966 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3968 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3969 symbol
= create_block_symbol (ggc_strdup (label
),
3970 get_block_for_section (sect
), -1);
3973 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3975 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3976 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3977 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3979 /* Construct the MEM. */
3980 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3981 set_mem_align (def
, align
);
3983 /* If we're dropping a label to the constant pool, make sure we
3985 if (GET_CODE (x
) == LABEL_REF
)
3986 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3988 return copy_rtx (def
);
3991 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3994 get_pool_constant (const_rtx addr
)
3996 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3999 /* Given a constant pool SYMBOL_REF, return the corresponding constant
4000 and whether it has been output or not. */
4003 get_pool_constant_mark (rtx addr
, bool *pmarked
)
4005 class constant_descriptor_rtx
*desc
;
4007 desc
= SYMBOL_REF_CONSTANT (addr
);
4008 *pmarked
= (desc
->mark
!= 0);
4009 return desc
->constant
;
4012 /* Similar, return the mode. */
4015 get_pool_mode (const_rtx addr
)
4017 return SYMBOL_REF_CONSTANT (addr
)->mode
;
4020 /* Return TRUE if and only if the constant pool has no entries. Note
4021 that even entries we might end up choosing not to emit are counted
4022 here, so there is the potential for missed optimizations. */
4025 constant_pool_empty_p (void)
4027 return crtl
->varasm
.pool
->first
== NULL
;
4030 /* Worker function for output_constant_pool_1. Emit assembly for X
4031 in MODE with known alignment ALIGN. */
4034 output_constant_pool_2 (fixed_size_mode mode
, rtx x
, unsigned int align
)
4036 switch (GET_MODE_CLASS (mode
))
4039 case MODE_DECIMAL_FLOAT
:
4041 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
4042 assemble_real (*CONST_DOUBLE_REAL_VALUE (x
),
4043 as_a
<scalar_float_mode
> (mode
), align
, false);
4048 case MODE_PARTIAL_INT
:
4053 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
4056 case MODE_VECTOR_BOOL
:
4058 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
4060 /* Pick the smallest integer mode that contains at least one
4061 whole element. Often this is byte_mode and contains more
4062 than one element. */
4063 unsigned int nelts
= GET_MODE_NUNITS (mode
);
4064 unsigned int elt_bits
= GET_MODE_PRECISION (mode
) / nelts
;
4065 unsigned int int_bits
= MAX (elt_bits
, BITS_PER_UNIT
);
4066 scalar_int_mode int_mode
= int_mode_for_size (int_bits
, 0).require ();
4067 unsigned int mask
= GET_MODE_MASK (GET_MODE_INNER (mode
));
4069 /* We allow GET_MODE_PRECISION (mode) <= GET_MODE_BITSIZE (mode) but
4070 only properly handle cases where the difference is less than a
4072 gcc_assert (GET_MODE_BITSIZE (mode
) - GET_MODE_PRECISION (mode
) <
4075 /* Build the constant up one integer at a time. */
4076 unsigned int elts_per_int
= int_bits
/ elt_bits
;
4077 for (unsigned int i
= 0; i
< nelts
; i
+= elts_per_int
)
4079 unsigned HOST_WIDE_INT value
= 0;
4080 unsigned int limit
= MIN (nelts
- i
, elts_per_int
);
4081 for (unsigned int j
= 0; j
< limit
; ++j
)
4083 auto elt
= INTVAL (CONST_VECTOR_ELT (x
, i
+ j
));
4084 value
|= (elt
& mask
) << (j
* elt_bits
);
4086 output_constant_pool_2 (int_mode
, gen_int_mode (value
, int_mode
),
4087 i
!= 0 ? MIN (align
, int_bits
) : align
);
4091 case MODE_VECTOR_FLOAT
:
4092 case MODE_VECTOR_INT
:
4093 case MODE_VECTOR_FRACT
:
4094 case MODE_VECTOR_UFRACT
:
4095 case MODE_VECTOR_ACCUM
:
4096 case MODE_VECTOR_UACCUM
:
4099 scalar_mode submode
= GET_MODE_INNER (mode
);
4100 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
4102 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
4103 units
= GET_MODE_NUNITS (mode
);
4105 for (i
= 0; i
< units
; i
++)
4107 rtx elt
= CONST_VECTOR_ELT (x
, i
);
4108 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
4118 /* Worker function for output_constant_pool. Emit constant DESC,
4119 giving it ALIGN bits of alignment. */
4122 output_constant_pool_1 (class constant_descriptor_rtx
*desc
,
4129 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
4130 whose CODE_LABEL has been deleted. This can occur if a jump table
4131 is eliminated by optimization. If so, write a constant of zero
4132 instead. Note that this can also happen by turning the
4133 CODE_LABEL into a NOTE. */
4134 /* ??? This seems completely and utterly wrong. Certainly it's
4135 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
4136 functioning even with rtx_insn::deleted and friends. */
4139 switch (GET_CODE (tmp
))
4142 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
4143 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
4145 tmp
= XEXP (XEXP (tmp
, 0), 0);
4150 rtx_insn
*insn
= label_ref_label (tmp
);
4151 gcc_assert (!insn
->deleted ());
4152 gcc_assert (!NOTE_P (insn
)
4153 || NOTE_KIND (insn
) != NOTE_INSN_DELETED
);
4161 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
4162 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
4163 align
, desc
->labelno
, done
);
4166 assemble_align (align
);
4168 /* Output the label. */
4169 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
4172 Pass actual alignment value while emitting string constant to asm code
4173 as function 'output_constant_pool_1' explicitly passes the alignment as 1
4174 assuming that the data is already aligned which prevents the generation
4175 of fix-up table entries. */
4176 output_constant_pool_2 (desc
->mode
, x
, desc
->align
);
4178 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
4179 sections have proper size. */
4180 if (align
> GET_MODE_BITSIZE (desc
->mode
)
4182 && (in_section
->common
.flags
& SECTION_MERGE
))
4183 assemble_align (align
);
4185 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
4191 /* Recompute the offsets of entries in POOL, and the overall size of
4192 POOL. Do this after calling mark_constant_pool to ensure that we
4193 are computing the offset values for the pool which we will actually
4197 recompute_pool_offsets (struct rtx_constant_pool
*pool
)
4199 class constant_descriptor_rtx
*desc
;
4202 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
4205 /* Recalculate offset. */
4206 unsigned int align
= desc
->align
;
4207 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
4208 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
4209 desc
->offset
= pool
->offset
;
4210 pool
->offset
+= GET_MODE_SIZE (desc
->mode
);
4214 /* Mark all constants that are referenced by SYMBOL_REFs in X.
4215 Emit referenced deferred strings. */
4218 mark_constants_in_pattern (rtx insn
)
4220 subrtx_iterator::array_type array
;
4221 FOR_EACH_SUBRTX (iter
, array
, PATTERN (insn
), ALL
)
4223 const_rtx x
= *iter
;
4224 if (GET_CODE (x
) == SYMBOL_REF
)
4226 if (CONSTANT_POOL_ADDRESS_P (x
))
4228 class constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
4229 if (desc
->mark
== 0)
4232 iter
.substitute (desc
->constant
);
4235 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
4237 tree decl
= SYMBOL_REF_DECL (x
);
4238 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
4240 n_deferred_constants
--;
4241 output_constant_def_contents (CONST_CAST_RTX (x
));
4248 /* Look through appropriate parts of INSN, marking all entries in the
4249 constant pool which are actually being used. Entries that are only
4250 referenced by other constants are also marked as used. Emit
4251 deferred strings that are used. */
4254 mark_constants (rtx_insn
*insn
)
4259 /* Insns may appear inside a SEQUENCE. Only check the patterns of
4260 insns, not any notes that may be attached. We don't want to mark
4261 a constant just because it happens to appear in a REG_EQUIV note. */
4262 if (rtx_sequence
*seq
= dyn_cast
<rtx_sequence
*> (PATTERN (insn
)))
4264 int i
, n
= seq
->len ();
4265 for (i
= 0; i
< n
; ++i
)
4267 rtx subinsn
= seq
->element (i
);
4268 if (INSN_P (subinsn
))
4269 mark_constants_in_pattern (subinsn
);
4273 mark_constants_in_pattern (insn
);
4276 /* Look through the instructions for this function, and mark all the
4277 entries in POOL which are actually being used. Emit deferred constants
4278 which have indeed been used. */
4281 mark_constant_pool (void)
4285 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
4288 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
4289 mark_constants (insn
);
4292 /* Write all the constants in POOL. */
4295 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
4297 class constant_descriptor_rtx
*desc
;
4299 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
4302 #ifdef ASM_OUTPUT_DEF
4303 const char *name
= XSTR (desc
->sym
, 0);
4305 char buffer
[256 + 32];
4308 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", ~desc
->mark
);
4312 sprintf (buffer
, "%s+%ld", p
, (long) (desc
->offset
));
4315 ASM_OUTPUT_DEF (asm_out_file
, name
, p
);
4320 else if (desc
->mark
)
4322 /* If the constant is part of an object_block, make sure that
4323 the constant has been positioned within its block, but do not
4324 write out its definition yet. output_object_blocks will do
4326 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
4327 && SYMBOL_REF_BLOCK (desc
->sym
))
4328 place_block_symbol (desc
->sym
);
4331 switch_to_section (targetm
.asm_out
.select_rtx_section
4332 (desc
->mode
, desc
->constant
, desc
->align
));
4333 output_constant_pool_1 (desc
, desc
->align
);
4338 struct constant_descriptor_rtx_data
{
4339 constant_descriptor_rtx
*desc
;
4341 unsigned short size
;
4342 unsigned short offset
;
4346 /* qsort callback to sort constant_descriptor_rtx_data * vector by
4350 constant_descriptor_rtx_data_cmp (const void *p1
, const void *p2
)
4352 constant_descriptor_rtx_data
*const data1
4353 = *(constant_descriptor_rtx_data
* const *) p1
;
4354 constant_descriptor_rtx_data
*const data2
4355 = *(constant_descriptor_rtx_data
* const *) p2
;
4356 if (data1
->size
> data2
->size
)
4358 if (data1
->size
< data2
->size
)
4360 if (data1
->hash
< data2
->hash
)
4362 gcc_assert (data1
->hash
> data2
->hash
);
4366 struct const_rtx_data_hasher
: nofree_ptr_hash
<constant_descriptor_rtx_data
>
4368 static hashval_t
hash (constant_descriptor_rtx_data
*);
4369 static bool equal (constant_descriptor_rtx_data
*,
4370 constant_descriptor_rtx_data
*);
4373 /* Hash and compare functions for const_rtx_data_htab. */
4376 const_rtx_data_hasher::hash (constant_descriptor_rtx_data
*data
)
4382 const_rtx_data_hasher::equal (constant_descriptor_rtx_data
*x
,
4383 constant_descriptor_rtx_data
*y
)
4385 if (x
->hash
!= y
->hash
|| x
->size
!= y
->size
)
4387 unsigned int align1
= x
->desc
->align
;
4388 unsigned int align2
= y
->desc
->align
;
4389 unsigned int offset1
= (x
->offset
* BITS_PER_UNIT
) & (align1
- 1);
4390 unsigned int offset2
= (y
->offset
* BITS_PER_UNIT
) & (align2
- 1);
4392 align1
= least_bit_hwi (offset1
);
4394 align2
= least_bit_hwi (offset2
);
4395 if (align2
> align1
)
4397 if (memcmp (x
->bytes
, y
->bytes
, x
->size
* sizeof (target_unit
)) != 0)
4402 /* Attempt to optimize constant pool POOL. If it contains both CONST_VECTOR
4403 constants and scalar constants with the values of CONST_VECTOR elements,
4404 try to alias the scalar constants with the CONST_VECTOR elements. */
4407 optimize_constant_pool (struct rtx_constant_pool
*pool
)
4409 auto_vec
<target_unit
, 128> buffer
;
4410 auto_vec
<constant_descriptor_rtx_data
*, 128> vec
;
4411 object_allocator
<constant_descriptor_rtx_data
>
4412 data_pool ("constant_descriptor_rtx_data_pool");
4415 for (constant_descriptor_rtx
*desc
= pool
->first
; desc
; desc
= desc
->next
)
4417 && ! (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
4418 && SYMBOL_REF_BLOCK (desc
->sym
)))
4420 buffer
.truncate (0);
4421 buffer
.reserve (GET_MODE_SIZE (desc
->mode
));
4422 if (native_encode_rtx (desc
->mode
, desc
->constant
, buffer
, 0,
4423 GET_MODE_SIZE (desc
->mode
)))
4425 constant_descriptor_rtx_data
*data
= data_pool
.allocate ();
4428 data
->size
= GET_MODE_SIZE (desc
->mode
);
4432 vec
.safe_push (data
);
4437 vec
.qsort (constant_descriptor_rtx_data_cmp
);
4438 unsigned min_size
= vec
.last ()->size
;
4439 target_unit
*bytes
= XNEWVEC (target_unit
, size
);
4441 constant_descriptor_rtx_data
*data
;
4442 hash_table
<const_rtx_data_hasher
> * htab
4443 = new hash_table
<const_rtx_data_hasher
> (31);
4445 FOR_EACH_VEC_ELT (vec
, i
, data
)
4447 buffer
.truncate (0);
4448 native_encode_rtx (data
->desc
->mode
, data
->desc
->constant
,
4449 buffer
, 0, data
->size
);
4450 memcpy (bytes
+ size
, buffer
.address (), data
->size
);
4451 data
->bytes
= bytes
+ size
;
4452 data
->hash
= iterative_hash (data
->bytes
,
4453 data
->size
* sizeof (target_unit
), 0);
4455 constant_descriptor_rtx_data
**slot
4456 = htab
->find_slot_with_hash (data
, data
->hash
, INSERT
);
4459 data
->desc
->mark
= ~(*slot
)->desc
->labelno
;
4460 data
->desc
->offset
= (*slot
)->offset
;
4464 unsigned int sz
= 1 << floor_log2 (data
->size
);
4467 for (sz
>>= 1; sz
>= min_size
; sz
>>= 1)
4468 for (unsigned off
= 0; off
+ sz
<= data
->size
; off
+= sz
)
4470 constant_descriptor_rtx_data tmp
;
4471 tmp
.desc
= data
->desc
;
4472 tmp
.bytes
= data
->bytes
+ off
;
4475 tmp
.hash
= iterative_hash (tmp
.bytes
,
4476 sz
* sizeof (target_unit
), 0);
4477 slot
= htab
->find_slot_with_hash (&tmp
, tmp
.hash
, INSERT
);
4480 *slot
= data_pool
.allocate ();
4489 data_pool
.release ();
4492 /* Mark all constants that are used in the current function, then write
4493 out the function's private constant pool. */
4496 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
4497 tree fndecl ATTRIBUTE_UNUSED
)
4499 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
4501 /* It is possible for gcc to call force_const_mem and then to later
4502 discard the instructions which refer to the constant. In such a
4503 case we do not need to output the constant. */
4504 mark_constant_pool ();
4506 /* Having marked the constant pool entries we'll actually emit, we
4507 now need to rebuild the offset information, which may have become
4509 recompute_pool_offsets (pool
);
4511 #ifdef ASM_OUTPUT_POOL_PROLOGUE
4512 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4515 output_constant_pool_contents (pool
);
4517 #ifdef ASM_OUTPUT_POOL_EPILOGUE
4518 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4522 /* Write the contents of the shared constant pool. */
4525 output_shared_constant_pool (void)
4528 && TARGET_SUPPORTS_ALIASES
)
4529 optimize_constant_pool (shared_constant_pool
);
4531 output_constant_pool_contents (shared_constant_pool
);
4534 /* Determine what kind of relocations EXP may need. */
4537 compute_reloc_for_constant (tree exp
)
4539 int reloc
= 0, reloc2
;
4542 switch (TREE_CODE (exp
))
4546 /* Go inside any operations that get_inner_reference can handle and see
4547 if what's inside is a constant: no need to do anything here for
4548 addresses of variables or functions. */
4549 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4550 tem
= TREE_OPERAND (tem
, 0))
4553 if (TREE_CODE (tem
) == MEM_REF
4554 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
4556 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
4560 if (!targetm
.binds_local_p (tem
))
4567 case POINTER_PLUS_EXPR
:
4568 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4569 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4573 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4574 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4575 /* The difference of two local labels is computable at link time. */
4576 if (reloc
== 1 && reloc2
== 1)
4583 case VIEW_CONVERT_EXPR
:
4584 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4589 unsigned HOST_WIDE_INT idx
;
4590 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4592 reloc
|= compute_reloc_for_constant (tem
);
4602 /* Find all the constants whose addresses are referenced inside of EXP,
4603 and make sure assembler code with a label has been output for each one.
4604 Indicate whether an ADDR_EXPR has been encountered. */
4607 output_addressed_constants (tree exp
, int defer
)
4611 switch (TREE_CODE (exp
))
4615 /* Go inside any operations that get_inner_reference can handle and see
4616 if what's inside is a constant: no need to do anything here for
4617 addresses of variables or functions. */
4618 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4619 tem
= TREE_OPERAND (tem
, 0))
4622 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4623 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4624 tem
= DECL_INITIAL (tem
);
4626 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4627 output_constant_def (tem
, defer
);
4629 if (TREE_CODE (tem
) == MEM_REF
)
4630 output_addressed_constants (TREE_OPERAND (tem
, 0), defer
);
4634 case POINTER_PLUS_EXPR
:
4636 output_addressed_constants (TREE_OPERAND (exp
, 1), defer
);
4640 case VIEW_CONVERT_EXPR
:
4641 output_addressed_constants (TREE_OPERAND (exp
, 0), defer
);
4646 unsigned HOST_WIDE_INT idx
;
4647 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4649 output_addressed_constants (tem
, defer
);
4658 /* Whether a constructor CTOR is a valid static constant initializer if all
4659 its elements are. This used to be internal to initializer_constant_valid_p
4660 and has been exposed to let other functions like categorize_ctor_elements
4661 evaluate the property while walking a constructor for other purposes. */
4664 constructor_static_from_elts_p (const_tree ctor
)
4666 return (TREE_CONSTANT (ctor
)
4667 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4668 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4669 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4672 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4675 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4676 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4677 which are valid when ENDTYPE is an integer of any size; in
4678 particular, this does not accept a pointer minus a constant. This
4679 returns null_pointer_node if the VALUE is an absolute constant
4680 which can be used to initialize a static variable. Otherwise it
4684 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4688 if (!INTEGRAL_TYPE_P (endtype
))
4691 op0
= TREE_OPERAND (value
, 0);
4692 op1
= TREE_OPERAND (value
, 1);
4694 /* Like STRIP_NOPS except allow the operand mode to widen. This
4695 works around a feature of fold that simplifies (int)(p1 - p2) to
4696 ((int)p1 - (int)p2) under the theory that the narrower operation
4699 while (CONVERT_EXPR_P (op0
)
4700 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4702 tree inner
= TREE_OPERAND (op0
, 0);
4703 if (inner
== error_mark_node
4704 || ! INTEGRAL_TYPE_P (TREE_TYPE (op0
))
4705 || ! SCALAR_INT_MODE_P (TYPE_MODE (TREE_TYPE (op0
)))
4706 || ! INTEGRAL_TYPE_P (TREE_TYPE (inner
))
4707 || ! SCALAR_INT_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4708 || (GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (op0
)))
4709 > GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (inner
)))))
4714 while (CONVERT_EXPR_P (op1
)
4715 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4717 tree inner
= TREE_OPERAND (op1
, 0);
4718 if (inner
== error_mark_node
4719 || ! INTEGRAL_TYPE_P (TREE_TYPE (op1
))
4720 || ! SCALAR_INT_MODE_P (TYPE_MODE (TREE_TYPE (op1
)))
4721 || ! INTEGRAL_TYPE_P (TREE_TYPE (inner
))
4722 || ! SCALAR_INT_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4723 || (GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (op1
)))
4724 > GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (inner
)))))
4729 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4733 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4734 cache
? cache
+ 2 : NULL
);
4735 /* Both initializers must be known. */
4739 && (op0
== null_pointer_node
4740 || TREE_CODE (value
) == MINUS_EXPR
))
4741 return null_pointer_node
;
4743 /* Support differences between labels. */
4744 if (TREE_CODE (op0
) == LABEL_DECL
4745 && TREE_CODE (op1
) == LABEL_DECL
)
4746 return null_pointer_node
;
4748 if (TREE_CODE (op0
) == STRING_CST
4749 && TREE_CODE (op1
) == STRING_CST
4750 && operand_equal_p (op0
, op1
, 1))
4751 return null_pointer_node
;
4757 /* Helper function of initializer_constant_valid_p.
4758 Return nonzero if VALUE is a valid constant-valued expression
4759 for use in initializing a static variable; one that can be an
4760 element of a "constant" initializer.
4762 Return null_pointer_node if the value is absolute;
4763 if it is relocatable, return the variable that determines the relocation.
4764 We assume that VALUE has been folded as much as possible;
4765 therefore, we do not need to check for such things as
4766 arithmetic-combinations of integers.
4768 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4771 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4775 switch (TREE_CODE (value
))
4778 if (constructor_static_from_elts_p (value
))
4780 unsigned HOST_WIDE_INT idx
;
4782 bool absolute
= true;
4784 if (cache
&& cache
[0] == value
)
4786 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4789 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4792 /* An absolute value is required with reverse SSO. */
4793 || (reloc
!= null_pointer_node
4794 && TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (value
))
4795 && !AGGREGATE_TYPE_P (TREE_TYPE (elt
))))
4800 cache
[1] = NULL_TREE
;
4804 if (reloc
!= null_pointer_node
)
4807 /* For a non-absolute relocation, there is no single
4808 variable that can be "the variable that determines the
4813 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4815 return absolute
? null_pointer_node
: error_mark_node
;
4818 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4826 return null_pointer_node
;
4831 tree op0
= staticp (TREE_OPERAND (value
, 0));
4834 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4835 to be a constant, this is old-skool offsetof-like nonsense. */
4836 if (TREE_CODE (op0
) == INDIRECT_REF
4837 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4838 return null_pointer_node
;
4839 /* Taking the address of a nested function involves a trampoline,
4840 unless we don't need or want one. */
4841 if (TREE_CODE (op0
) == FUNCTION_DECL
4842 && DECL_STATIC_CHAIN (op0
)
4843 && !TREE_NO_TRAMPOLINE (value
))
4845 /* "&{...}" requires a temporary to hold the constructed
4847 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4853 case NON_LVALUE_EXPR
:
4854 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4857 case VIEW_CONVERT_EXPR
:
4859 tree src
= TREE_OPERAND (value
, 0);
4860 tree src_type
= TREE_TYPE (src
);
4861 tree dest_type
= TREE_TYPE (value
);
4863 /* Allow view-conversions from aggregate to non-aggregate type only
4864 if the bit pattern is fully preserved afterwards; otherwise, the
4865 RTL expander won't be able to apply a subsequent transformation
4866 to the underlying constructor. */
4867 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4869 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4870 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4875 /* Allow all other kinds of view-conversion. */
4876 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4881 tree src
= TREE_OPERAND (value
, 0);
4882 tree src_type
= TREE_TYPE (src
);
4883 tree dest_type
= TREE_TYPE (value
);
4885 /* Allow conversions between pointer types and offset types. */
4886 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4887 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4888 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4889 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4891 /* Allow length-preserving conversions between integer types and
4892 floating-point types. */
4893 if (((INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4894 || (SCALAR_FLOAT_TYPE_P (dest_type
)
4895 && SCALAR_FLOAT_TYPE_P (src_type
)))
4896 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4897 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4899 /* Allow conversions between other integer types only if
4900 explicit value. Don't allow sign-extension to a type larger
4901 than word and pointer, there aren't relocations that would
4902 allow to sign extend it to a wider type. */
4903 if (INTEGRAL_TYPE_P (dest_type
)
4904 && INTEGRAL_TYPE_P (src_type
)
4905 && (TYPE_UNSIGNED (src_type
)
4906 || TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
)
4907 || TYPE_PRECISION (dest_type
) <= BITS_PER_WORD
4908 || TYPE_PRECISION (dest_type
) <= POINTER_SIZE
))
4910 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4911 if (inner
== null_pointer_node
)
4912 return null_pointer_node
;
4916 /* Allow (int) &foo provided int is as wide as a pointer. */
4917 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4918 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4919 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4921 /* Likewise conversions from int to pointers, but also allow
4922 conversions from 0. */
4923 if ((POINTER_TYPE_P (dest_type
)
4924 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4925 && INTEGRAL_TYPE_P (src_type
))
4927 if (TREE_CODE (src
) == INTEGER_CST
4928 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4929 return null_pointer_node
;
4930 if (integer_zerop (src
))
4931 return null_pointer_node
;
4932 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4933 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4936 /* Allow conversions to struct or union types if the value
4938 if (TREE_CODE (dest_type
) == RECORD_TYPE
4939 || TREE_CODE (dest_type
) == UNION_TYPE
)
4940 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4944 case POINTER_PLUS_EXPR
:
4946 /* Any valid floating-point constants will have been folded by now;
4947 with -frounding-math we hit this with addition of two constants. */
4948 if (TREE_CODE (endtype
) == REAL_TYPE
)
4950 if (cache
&& cache
[0] == value
)
4952 if (! INTEGRAL_TYPE_P (endtype
)
4953 || ! INTEGRAL_TYPE_P (TREE_TYPE (value
))
4954 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4956 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4958 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4961 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4962 endtype
, ncache
+ 2);
4963 /* If either term is absolute, use the other term's relocation. */
4964 if (valid0
== null_pointer_node
)
4966 else if (valid1
== null_pointer_node
)
4968 /* Support narrowing pointer differences. */
4970 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4974 /* Support narrowing pointer differences. */
4975 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4983 case POINTER_DIFF_EXPR
:
4985 if (TREE_CODE (endtype
) == REAL_TYPE
)
4987 if (cache
&& cache
[0] == value
)
4989 if (! INTEGRAL_TYPE_P (endtype
)
4990 || ! INTEGRAL_TYPE_P (TREE_TYPE (value
))
4991 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4993 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4995 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4998 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4999 endtype
, ncache
+ 2);
5000 /* Win if second argument is absolute. */
5001 if (valid1
== null_pointer_node
)
5003 /* Win if both arguments have the same relocation.
5004 Then the value is absolute. */
5005 else if (valid0
== valid1
&& valid0
!= 0)
5006 ret
= null_pointer_node
;
5007 /* Since GCC guarantees that string constants are unique in the
5008 generated code, a subtraction between two copies of the same
5009 constant string is absolute. */
5010 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
5011 && valid1
&& TREE_CODE (valid1
) == STRING_CST
5012 && operand_equal_p (valid0
, valid1
, 1))
5013 ret
= null_pointer_node
;
5014 /* Support narrowing differences. */
5016 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
5020 /* Support narrowing differences. */
5021 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
5036 /* Return nonzero if VALUE is a valid constant-valued expression
5037 for use in initializing a static variable; one that can be an
5038 element of a "constant" initializer.
5040 Return null_pointer_node if the value is absolute;
5041 if it is relocatable, return the variable that determines the relocation.
5042 We assume that VALUE has been folded as much as possible;
5043 therefore, we do not need to check for such things as
5044 arithmetic-combinations of integers. */
5046 initializer_constant_valid_p (tree value
, tree endtype
, bool reverse
)
5048 tree reloc
= initializer_constant_valid_p_1 (value
, endtype
, NULL
);
5050 /* An absolute value is required with reverse storage order. */
5052 && reloc
!= null_pointer_node
5054 && !AGGREGATE_TYPE_P (endtype
)
5055 && !VECTOR_TYPE_P (endtype
))
5061 /* Return true if VALUE is a valid constant-valued expression
5062 for use in initializing a static bit-field; one that can be
5063 an element of a "constant" initializer. */
5066 initializer_constant_valid_for_bitfield_p (const_tree value
)
5068 /* For bitfields we support integer constants or possibly nested aggregates
5070 switch (TREE_CODE (value
))
5074 unsigned HOST_WIDE_INT idx
;
5077 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
5078 if (!initializer_constant_valid_for_bitfield_p (elt
))
5087 case VIEW_CONVERT_EXPR
:
5088 case NON_LVALUE_EXPR
:
5090 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
5099 /* Check if a STRING_CST fits into the field.
5100 Tolerate only the case when the NUL termination
5101 does not fit into the field. */
5104 check_string_literal (tree string
, unsigned HOST_WIDE_INT size
)
5106 tree type
= TREE_TYPE (string
);
5107 tree eltype
= TREE_TYPE (type
);
5108 unsigned HOST_WIDE_INT elts
= tree_to_uhwi (TYPE_SIZE_UNIT (eltype
));
5109 unsigned HOST_WIDE_INT mem_size
= tree_to_uhwi (TYPE_SIZE_UNIT (type
));
5110 int len
= TREE_STRING_LENGTH (string
);
5112 if (elts
!= 1 && elts
!= 2 && elts
!= 4)
5114 if (len
< 0 || len
% elts
!= 0)
5116 if (size
< (unsigned)len
)
5118 if (mem_size
!= size
)
5123 /* output_constructor outer state of relevance in recursive calls, typically
5124 for nested aggregate bitfields. */
5126 struct oc_outer_state
{
5127 unsigned int bit_offset
; /* current position in ... */
5128 int byte
; /* ... the outer byte buffer. */
5131 static unsigned HOST_WIDE_INT
5132 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int, bool,
5135 /* Output assembler code for constant EXP, with no label.
5136 This includes the pseudo-op such as ".int" or ".byte", and a newline.
5137 Assumes output_addressed_constants has been done on EXP already.
5139 Generate at least SIZE bytes of assembler data, padding at the end
5140 with zeros if necessary. SIZE must always be specified. The returned
5141 value is the actual number of bytes of assembler data generated, which
5142 may be bigger than SIZE if the object contains a variable length field.
5144 SIZE is important for structure constructors,
5145 since trailing members may have been omitted from the constructor.
5146 It is also important for initialization of arrays from string constants
5147 since the full length of the string constant might not be wanted.
5148 It is also needed for initialization of unions, where the initializer's
5149 type is just one member, and that may not be as long as the union.
5151 There a case in which we would fail to output exactly SIZE bytes:
5152 for a structure constructor that wants to produce more than SIZE bytes.
5153 But such constructors will never be generated for any possible input.
5155 ALIGN is the alignment of the data in bits.
5157 If REVERSE is true, EXP is output in reverse storage order. */
5159 static unsigned HOST_WIDE_INT
5160 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
,
5161 bool reverse
, bool merge_strings
)
5163 enum tree_code code
;
5164 unsigned HOST_WIDE_INT thissize
;
5167 if (size
== 0 || flag_syntax_only
)
5170 /* See if we're trying to initialize a pointer in a non-default mode
5171 to the address of some declaration somewhere. If the target says
5172 the mode is valid for pointers, assume the target has a way of
5174 if (TREE_CODE (exp
) == NOP_EXPR
5175 && POINTER_TYPE_P (TREE_TYPE (exp
))
5176 && targetm
.addr_space
.valid_pointer_mode
5177 (SCALAR_INT_TYPE_MODE (TREE_TYPE (exp
)),
5178 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
5180 tree saved_type
= TREE_TYPE (exp
);
5182 /* Peel off any intermediate conversions-to-pointer for valid
5184 while (TREE_CODE (exp
) == NOP_EXPR
5185 && POINTER_TYPE_P (TREE_TYPE (exp
))
5186 && targetm
.addr_space
.valid_pointer_mode
5187 (SCALAR_INT_TYPE_MODE (TREE_TYPE (exp
)),
5188 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
5189 exp
= TREE_OPERAND (exp
, 0);
5191 /* If what we're left with is the address of something, we can
5192 convert the address to the final type and output it that
5194 if (TREE_CODE (exp
) == ADDR_EXPR
)
5195 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
5196 /* Likewise for constant ints. */
5197 else if (TREE_CODE (exp
) == INTEGER_CST
)
5198 exp
= fold_convert (saved_type
, exp
);
5202 /* Eliminate any conversions since we'll be outputting the underlying
5204 while (CONVERT_EXPR_P (exp
)
5205 || TREE_CODE (exp
) == NON_LVALUE_EXPR
5206 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
5208 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
5209 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
5211 /* Make sure eliminating the conversion is really a no-op, except with
5212 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
5213 union types to allow for Ada unchecked unions. */
5214 if (type_size
> op_size
5215 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
5216 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
5217 /* Keep the conversion. */
5220 exp
= TREE_OPERAND (exp
, 0);
5223 code
= TREE_CODE (TREE_TYPE (exp
));
5224 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
5226 /* Allow a constructor with no elements for any data type.
5227 This means to fill the space with zeros. */
5228 if (TREE_CODE (exp
) == CONSTRUCTOR
5229 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
5231 assemble_zeros (size
);
5235 if (TREE_CODE (exp
) == FDESC_EXPR
)
5237 #ifdef ASM_OUTPUT_FDESC
5238 HOST_WIDE_INT part
= tree_to_shwi (TREE_OPERAND (exp
, 1));
5239 tree decl
= TREE_OPERAND (exp
, 0);
5240 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
5247 /* Now output the underlying data. If we've handling the padding, return.
5248 Otherwise, break and ensure SIZE is the size written. */
5255 case REFERENCE_TYPE
:
5257 case FIXED_POINT_TYPE
:
5259 cst
= expand_expr (exp
, NULL_RTX
, VOIDmode
, EXPAND_INITIALIZER
);
5261 cst
= flip_storage_order (TYPE_MODE (TREE_TYPE (exp
)), cst
);
5262 if (!assemble_integer (cst
, MIN (size
, thissize
), align
, 0))
5263 error ("initializer for integer/fixed-point value is too complicated");
5267 gcc_assert (size
== thissize
);
5268 if (TREE_CODE (exp
) != REAL_CST
)
5269 error ("initializer for floating value is not a floating constant");
5271 assemble_real (TREE_REAL_CST (exp
),
5272 SCALAR_FLOAT_TYPE_MODE (TREE_TYPE (exp
)),
5277 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
,
5279 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
5280 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)),
5286 switch (TREE_CODE (exp
))
5289 return output_constructor (exp
, size
, align
, reverse
, NULL
);
5291 thissize
= (unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
);
5294 || TREE_STRING_POINTER (exp
) [thissize
- 1] != '\0'))
5296 gcc_checking_assert (check_string_literal (exp
, size
));
5297 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
5301 scalar_mode inner
= SCALAR_TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
5302 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
5303 int elt_size
= GET_MODE_SIZE (inner
);
5304 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
,
5306 thissize
= elt_size
;
5307 /* Static constants must have a fixed size. */
5308 unsigned int nunits
= VECTOR_CST_NELTS (exp
).to_constant ();
5309 for (unsigned int i
= 1; i
< nunits
; i
++)
5311 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
,
5313 thissize
+= elt_size
;
5324 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
5325 return output_constructor (exp
, size
, align
, reverse
, NULL
);
5334 if (size
> thissize
)
5335 assemble_zeros (size
- thissize
);
5340 /* Subroutine of output_constructor, used for computing the size of
5341 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
5342 type with an unspecified upper bound. */
5344 static unsigned HOST_WIDE_INT
5345 array_size_for_constructor (tree val
)
5348 unsigned HOST_WIDE_INT cnt
;
5349 tree index
, value
, tmp
;
5352 /* This code used to attempt to handle string constants that are not
5353 arrays of single-bytes, but nothing else does, so there's no point in
5355 if (TREE_CODE (val
) == STRING_CST
)
5356 return TREE_STRING_LENGTH (val
);
5358 max_index
= NULL_TREE
;
5359 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
5361 if (TREE_CODE (index
) == RANGE_EXPR
)
5362 index
= TREE_OPERAND (index
, 1);
5363 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
5367 if (max_index
== NULL_TREE
)
5370 /* Compute the total number of array elements. */
5371 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
5372 i
= wi::to_offset (max_index
) - wi::to_offset (tmp
) + 1;
5374 /* Multiply by the array element unit size to find number of bytes. */
5375 i
*= wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
5377 gcc_assert (wi::fits_uhwi_p (i
));
5378 return i
.to_uhwi ();
5381 /* Other datastructures + helpers for output_constructor. */
5383 /* output_constructor local state to support interaction with helpers. */
5385 struct oc_local_state
{
5387 /* Received arguments. */
5388 tree exp
; /* Constructor expression. */
5389 tree type
; /* Type of constructor expression. */
5390 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
5391 unsigned int align
; /* Known initial alignment. */
5392 tree min_index
; /* Lower bound if specified for an array. */
5394 /* Output processing state. */
5395 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
5396 int byte
; /* Part of a bitfield byte yet to be output. */
5397 int last_relative_index
; /* Implicit or explicit index of the last
5398 array element output within a bitfield. */
5399 bool byte_buffer_in_use
; /* Whether BYTE is in use. */
5400 bool reverse
; /* Whether reverse storage order is in use. */
5402 /* Current element. */
5403 tree field
; /* Current field decl in a record. */
5404 tree val
; /* Current element value. */
5405 tree index
; /* Current element index. */
5409 /* Helper for output_constructor. From the current LOCAL state, output a
5410 RANGE_EXPR element. */
5413 output_constructor_array_range (oc_local_state
*local
)
5415 /* Perform the index calculation in modulo arithmetic but
5416 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
5417 but we are using an unsigned sizetype. */
5418 unsigned prec
= TYPE_PRECISION (sizetype
);
5419 offset_int idx
= wi::sext (wi::to_offset (TREE_OPERAND (local
->index
, 0))
5420 - wi::to_offset (local
->min_index
), prec
);
5421 tree valtype
= TREE_TYPE (local
->val
);
5422 HOST_WIDE_INT fieldpos
5423 = (idx
* wi::to_offset (TYPE_SIZE_UNIT (valtype
))).to_short_addr ();
5425 /* Advance to offset of this element. */
5426 if (fieldpos
> local
->total_bytes
)
5428 assemble_zeros (fieldpos
- local
->total_bytes
);
5429 local
->total_bytes
= fieldpos
;
5432 /* Must not go backwards. */
5433 gcc_assert (fieldpos
== local
->total_bytes
);
5435 unsigned HOST_WIDE_INT fieldsize
5436 = int_size_in_bytes (TREE_TYPE (local
->type
));
5438 HOST_WIDE_INT lo_index
5439 = tree_to_shwi (TREE_OPERAND (local
->index
, 0));
5440 HOST_WIDE_INT hi_index
5441 = tree_to_shwi (TREE_OPERAND (local
->index
, 1));
5442 HOST_WIDE_INT index
;
5445 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
5447 for (index
= lo_index
; index
<= hi_index
; index
++)
5449 /* Output the element's initial value. */
5450 if (local
->val
== NULL_TREE
)
5451 assemble_zeros (fieldsize
);
5453 fieldsize
= output_constant (local
->val
, fieldsize
, align2
,
5454 local
->reverse
, false);
5456 /* Count its size. */
5457 local
->total_bytes
+= fieldsize
;
5461 /* Helper for output_constructor. From the current LOCAL state, output a
5462 field element that is not true bitfield or part of an outer one. */
5465 output_constructor_regular_field (oc_local_state
*local
)
5467 /* Field size and position. Since this structure is static, we know the
5468 positions are constant. */
5469 unsigned HOST_WIDE_INT fieldsize
;
5470 HOST_WIDE_INT fieldpos
;
5472 unsigned int align2
;
5474 /* Output any buffered-up bit-fields preceding this element. */
5475 if (local
->byte_buffer_in_use
)
5477 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5478 local
->total_bytes
++;
5479 local
->byte_buffer_in_use
= false;
5482 if (local
->index
!= NULL_TREE
)
5484 /* Perform the index calculation in modulo arithmetic but
5485 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
5486 but we are using an unsigned sizetype. */
5487 unsigned prec
= TYPE_PRECISION (sizetype
);
5488 offset_int idx
= wi::sext (wi::to_offset (local
->index
)
5489 - wi::to_offset (local
->min_index
), prec
);
5490 fieldpos
= (idx
* wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
))))
5493 else if (local
->field
!= NULL_TREE
)
5494 fieldpos
= int_byte_position (local
->field
);
5498 /* Advance to offset of this element.
5499 Note no alignment needed in an array, since that is guaranteed
5500 if each element has the proper size. */
5501 if (local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
5503 if (fieldpos
> local
->total_bytes
)
5505 assemble_zeros (fieldpos
- local
->total_bytes
);
5506 local
->total_bytes
= fieldpos
;
5509 /* Must not go backwards. */
5510 gcc_assert (fieldpos
== local
->total_bytes
);
5513 /* Find the alignment of this element. */
5514 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
5516 /* Determine size this element should occupy. */
5521 /* If this is an array with an unspecified upper bound,
5522 the initializer determines the size. */
5523 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
5524 but we cannot do this until the deprecated support for
5525 initializing zero-length array members is removed. */
5526 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
5527 && (!TYPE_DOMAIN (TREE_TYPE (local
->field
))
5528 || !TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
)))))
5530 unsigned HOST_WIDE_INT fldsize
5531 = array_size_for_constructor (local
->val
);
5532 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->val
));
5533 /* In most cases fieldsize == fldsize as the size of the initializer
5534 determines how many elements the flexible array member has. For
5535 C++ fldsize can be smaller though, if the last or several last or
5536 all initializers of the flexible array member have side-effects
5537 and the FE splits them into dynamic initialization. */
5538 gcc_checking_assert (fieldsize
>= fldsize
);
5539 /* Given a non-empty initialization, this field had better
5540 be last. Given a flexible array member, the next field
5541 on the chain is a TYPE_DECL of the enclosing struct. */
5542 const_tree next
= DECL_CHAIN (local
->field
);
5543 gcc_assert (!fieldsize
|| !next
|| TREE_CODE (next
) != FIELD_DECL
);
5546 fieldsize
= tree_to_uhwi (DECL_SIZE_UNIT (local
->field
));
5549 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
5551 /* Output the element's initial value. */
5552 if (local
->val
== NULL_TREE
)
5553 assemble_zeros (fieldsize
);
5555 fieldsize
= output_constant (local
->val
, fieldsize
, align2
,
5556 local
->reverse
, false);
5558 /* Count its size. */
5559 local
->total_bytes
+= fieldsize
;
5562 /* Helper for output_constructor. From the LOCAL state, output an element
5563 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
5564 from the start of a possibly ongoing outer byte buffer. */
5567 output_constructor_bitfield (oc_local_state
*local
, unsigned int bit_offset
)
5569 /* Bit size of this element. */
5570 HOST_WIDE_INT ebitsize
5572 ? tree_to_uhwi (DECL_SIZE (local
->field
))
5573 : tree_to_uhwi (TYPE_SIZE (TREE_TYPE (local
->type
))));
5575 /* Relative index of this element if this is an array component. */
5576 HOST_WIDE_INT relative_index
5580 ? tree_to_uhwi (local
->index
) - tree_to_uhwi (local
->min_index
)
5581 : local
->last_relative_index
+ 1));
5583 /* Bit position of this element from the start of the containing
5585 HOST_WIDE_INT constructor_relative_ebitpos
5587 ? int_bit_position (local
->field
)
5588 : ebitsize
* relative_index
);
5590 /* Bit position of this element from the start of a possibly ongoing
5591 outer byte buffer. */
5592 HOST_WIDE_INT byte_relative_ebitpos
5593 = bit_offset
+ constructor_relative_ebitpos
;
5595 /* From the start of a possibly ongoing outer byte buffer, offsets to
5596 the first bit of this element and to the first bit past the end of
5598 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
5599 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
5601 local
->last_relative_index
= relative_index
;
5603 if (local
->val
== NULL_TREE
)
5604 local
->val
= integer_zero_node
;
5606 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
5607 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
5608 local
->val
= TREE_OPERAND (local
->val
, 0);
5610 if (TREE_CODE (local
->val
) != INTEGER_CST
5611 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
5613 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
5617 /* If this field does not start in this (or next) byte, skip some bytes. */
5618 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5620 /* Output remnant of any bit field in previous bytes. */
5621 if (local
->byte_buffer_in_use
)
5623 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5624 local
->total_bytes
++;
5625 local
->byte_buffer_in_use
= false;
5628 /* If still not at proper byte, advance to there. */
5629 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5631 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
5632 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
5633 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
5637 /* Set up the buffer if necessary. */
5638 if (!local
->byte_buffer_in_use
)
5642 local
->byte_buffer_in_use
= true;
5645 /* If this is nested constructor, recurse passing the bit offset and the
5646 pending data, then retrieve the new pending data afterwards. */
5647 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
5649 oc_outer_state temp_state
;
5650 temp_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
5651 temp_state
.byte
= local
->byte
;
5653 += output_constructor (local
->val
, 0, 0, local
->reverse
, &temp_state
);
5654 local
->byte
= temp_state
.byte
;
5658 /* Otherwise, we must split the element into pieces that fall within
5659 separate bytes, and combine each byte with previous or following
5661 while (next_offset
< end_offset
)
5665 unsigned HOST_WIDE_INT value
;
5666 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
5667 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
5669 /* Advance from byte to byte within this element when necessary. */
5670 while (next_byte
!= local
->total_bytes
)
5672 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5673 local
->total_bytes
++;
5677 /* Number of bits we can process at once (all part of the same byte). */
5678 this_time
= MIN (end_offset
- next_offset
, BITS_PER_UNIT
- next_bit
);
5679 if (local
->reverse
? !BYTES_BIG_ENDIAN
: BYTES_BIG_ENDIAN
)
5681 /* For big-endian data, take the most significant bits (of the
5682 bits that are significant) first and put them into bytes from
5683 the most significant end. */
5684 shift
= end_offset
- next_offset
- this_time
;
5686 /* Don't try to take a bunch of bits that cross
5687 the word boundary in the INTEGER_CST. We can
5688 only select bits from one element. */
5689 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5690 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5692 const int end
= shift
+ this_time
- 1;
5693 shift
= end
& -HOST_BITS_PER_WIDE_INT
;
5694 this_time
= end
- shift
+ 1;
5697 /* Now get the bits we want to insert. */
5698 value
= wi::extract_uhwi (wi::to_widest (local
->val
),
5701 /* Get the result. This works only when:
5702 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5703 local
->byte
|= value
<< (BITS_PER_UNIT
- this_time
- next_bit
);
5707 /* On little-endian machines, take the least significant bits of
5708 the value first and pack them starting at the least significant
5709 bits of the bytes. */
5710 shift
= next_offset
- byte_relative_ebitpos
;
5712 /* Don't try to take a bunch of bits that cross
5713 the word boundary in the INTEGER_CST. We can
5714 only select bits from one element. */
5715 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5716 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5718 = HOST_BITS_PER_WIDE_INT
- (shift
& (HOST_BITS_PER_WIDE_INT
- 1));
5720 /* Now get the bits we want to insert. */
5721 value
= wi::extract_uhwi (wi::to_widest (local
->val
),
5724 /* Get the result. This works only when:
5725 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5726 local
->byte
|= value
<< next_bit
;
5729 next_offset
+= this_time
;
5730 local
->byte_buffer_in_use
= true;
5734 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5735 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5736 caller output state of relevance in recursive invocations. */
5738 static unsigned HOST_WIDE_INT
5739 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
,
5740 bool reverse
, oc_outer_state
*outer
)
5742 unsigned HOST_WIDE_INT cnt
;
5743 constructor_elt
*ce
;
5744 oc_local_state local
;
5746 /* Setup our local state to communicate with helpers. */
5748 local
.type
= TREE_TYPE (exp
);
5750 local
.align
= align
;
5751 if (TREE_CODE (local
.type
) == ARRAY_TYPE
&& TYPE_DOMAIN (local
.type
))
5752 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5754 local
.min_index
= integer_zero_node
;
5756 local
.total_bytes
= 0;
5757 local
.byte_buffer_in_use
= outer
!= NULL
;
5758 local
.byte
= outer
? outer
->byte
: 0;
5759 local
.last_relative_index
= -1;
5760 /* The storage order is specified for every aggregate type. */
5761 if (AGGREGATE_TYPE_P (local
.type
))
5762 local
.reverse
= TYPE_REVERSE_STORAGE_ORDER (local
.type
);
5764 local
.reverse
= reverse
;
5766 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5768 /* As CE goes through the elements of the constant, FIELD goes through the
5769 structure fields if the constant is a structure. If the constant is a
5770 union, we override this by getting the field from the TREE_LIST element.
5771 But the constant could also be an array. Then FIELD is zero.
5773 There is always a maximum of one element in the chain LINK for unions
5774 (even if the initializer in a source program incorrectly contains
5777 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5778 local
.field
= TYPE_FIELDS (local
.type
);
5780 local
.field
= NULL_TREE
;
5783 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5784 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5786 local
.val
= ce
->value
;
5787 local
.index
= NULL_TREE
;
5789 /* The element in a union constructor specifies the proper field
5791 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5792 local
.field
= ce
->index
;
5794 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5795 local
.index
= ce
->index
;
5797 if (local
.field
&& flag_verbose_asm
)
5798 fprintf (asm_out_file
, "%s %s:\n",
5800 DECL_NAME (local
.field
)
5801 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5804 /* Eliminate the marker that makes a cast not be an lvalue. */
5805 if (local
.val
!= NULL_TREE
)
5806 STRIP_NOPS (local
.val
);
5808 /* Output the current element, using the appropriate helper ... */
5810 /* For an array slice not part of an outer bitfield. */
5812 && local
.index
!= NULL_TREE
5813 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5814 output_constructor_array_range (&local
);
5816 /* For a field that is neither a true bitfield nor part of an outer one,
5817 known to be at least byte aligned and multiple-of-bytes long. */
5819 && (local
.field
== NULL_TREE
5820 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5821 output_constructor_regular_field (&local
);
5823 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5824 supported for scalar fields, so we may need to convert first. */
5827 if (TREE_CODE (local
.val
) == REAL_CST
)
5829 = fold_unary (VIEW_CONVERT_EXPR
,
5830 build_nonstandard_integer_type
5831 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5833 output_constructor_bitfield (&local
, outer
? outer
->bit_offset
: 0);
5837 /* If we are not at toplevel, save the pending data for our caller.
5838 Otherwise output the pending data and padding zeros as needed. */
5840 outer
->byte
= local
.byte
;
5843 if (local
.byte_buffer_in_use
)
5845 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5846 local
.total_bytes
++;
5849 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5851 assemble_zeros (local
.size
- local
.total_bytes
);
5852 local
.total_bytes
= local
.size
;
5856 return local
.total_bytes
;
5859 /* Mark DECL as weak. */
5862 mark_weak (tree decl
)
5864 if (DECL_WEAK (decl
))
5867 struct symtab_node
*n
= symtab_node::get (decl
);
5868 if (n
&& n
->refuse_visibility_changes
)
5869 error ("%qD declared weak after being used", decl
);
5870 DECL_WEAK (decl
) = 1;
5872 if (DECL_RTL_SET_P (decl
)
5873 && MEM_P (DECL_RTL (decl
))
5874 && XEXP (DECL_RTL (decl
), 0)
5875 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5876 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5879 /* Merge weak status between NEWDECL and OLDDECL. */
5882 merge_weak (tree newdecl
, tree olddecl
)
5884 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5886 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5889 /* We put the NEWDECL on the weak_decls list at some point
5890 and OLDDECL as well. Keep just OLDDECL on the list. */
5891 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5892 if (TREE_VALUE (*pwd
) == newdecl
)
5894 *pwd
= TREE_CHAIN (*pwd
);
5901 if (DECL_WEAK (newdecl
))
5905 /* NEWDECL is weak, but OLDDECL is not. */
5907 /* If we already output the OLDDECL, we're in trouble; we can't
5908 go back and make it weak. This should never happen in
5909 unit-at-a-time compilation. */
5910 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5912 /* If we've already generated rtl referencing OLDDECL, we may
5913 have done so in a way that will not function properly with
5914 a weak symbol. Again in unit-at-a-time this should be
5916 gcc_assert (!TREE_USED (olddecl
)
5917 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5919 /* PR 49899: You cannot convert a static function into a weak, public function. */
5920 if (! TREE_PUBLIC (olddecl
) && TREE_PUBLIC (newdecl
))
5921 error ("weak declaration of %q+D being applied to a already "
5922 "existing, static definition", newdecl
);
5924 if (TARGET_SUPPORTS_WEAK
)
5926 /* We put the NEWDECL on the weak_decls list at some point.
5927 Replace it with the OLDDECL. */
5928 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5929 if (TREE_VALUE (wd
) == newdecl
)
5931 TREE_VALUE (wd
) = olddecl
;
5934 /* We may not find the entry on the list. If NEWDECL is a
5935 weak alias, then we will have already called
5936 globalize_decl to remove the entry; in that case, we do
5937 not need to do anything. */
5940 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5941 mark_weak (olddecl
);
5944 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5945 weak. Just update NEWDECL to indicate that it's weak too. */
5946 mark_weak (newdecl
);
5949 /* Declare DECL to be a weak symbol. */
5952 declare_weak (tree decl
)
5954 /* With -fsyntax-only, TREE_ASM_WRITTEN might be set on certain function
5955 decls earlier than normally, but as with -fsyntax-only nothing is really
5956 emitted, there is no harm in marking it weak later. */
5957 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
5958 || !TREE_ASM_WRITTEN (decl
)
5959 || flag_syntax_only
);
5960 if (! TREE_PUBLIC (decl
))
5962 error ("weak declaration of %q+D must be public", decl
);
5965 else if (!TARGET_SUPPORTS_WEAK
)
5966 warning (0, "weak declaration of %q+D not supported", decl
);
5969 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5970 DECL_ATTRIBUTES (decl
)
5971 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5975 weak_finish_1 (tree decl
)
5977 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5978 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5981 if (! TREE_USED (decl
))
5984 #ifdef ASM_WEAKEN_DECL
5985 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5987 #ifdef ASM_WEAKEN_LABEL
5988 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5990 #ifdef ASM_OUTPUT_WEAK_ALIAS
5992 static bool warn_once
= 0;
5995 warning (0, "only weak aliases are supported in this configuration");
6005 /* Fiven an assembly name, find the decl it is associated with. */
6007 find_decl (tree target
)
6009 symtab_node
*node
= symtab_node::get_for_asmname (target
);
6015 /* This TREE_LIST contains weakref targets. */
6017 static GTY(()) tree weakref_targets
;
6019 /* Emit any pending weak declarations. */
6026 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
6028 tree alias_decl
= TREE_PURPOSE (t
);
6029 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
6031 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
))
6032 || TREE_SYMBOL_REFERENCED (target
))
6033 /* Remove alias_decl from the weak list, but leave entries for
6034 the target alone. */
6036 #ifndef ASM_OUTPUT_WEAKREF
6037 else if (! TREE_SYMBOL_REFERENCED (target
))
6039 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
6040 defined, otherwise we and weak_finish_1 would use
6041 different macros. */
6042 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
6043 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
6045 tree decl
= find_decl (target
);
6049 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
6050 TREE_CODE (alias_decl
), target
,
6051 TREE_TYPE (alias_decl
));
6053 DECL_EXTERNAL (decl
) = 1;
6054 TREE_PUBLIC (decl
) = 1;
6055 DECL_ARTIFICIAL (decl
) = 1;
6056 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
6057 TREE_USED (decl
) = 1;
6060 weak_finish_1 (decl
);
6069 /* Remove the alias and the target from the pending weak list
6070 so that we do not emit any .weak directives for the former,
6071 nor multiple .weak directives for the latter. */
6072 for (p
= &weak_decls
; (t2
= *p
) ; )
6074 if (TREE_VALUE (t2
) == alias_decl
6075 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
6076 *p
= TREE_CHAIN (t2
);
6078 p
= &TREE_CHAIN (t2
);
6081 /* Remove other weakrefs to the same target, to speed things up. */
6082 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
6084 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
6085 *p
= TREE_CHAIN (t2
);
6087 p
= &TREE_CHAIN (t2
);
6092 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
6094 tree decl
= TREE_VALUE (t
);
6096 weak_finish_1 (decl
);
6100 /* Emit the assembly bits to indicate that DECL is globally visible. */
6103 globalize_decl (tree decl
)
6106 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
6107 if (DECL_WEAK (decl
))
6109 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6112 #ifdef ASM_WEAKEN_DECL
6113 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
6115 ASM_WEAKEN_LABEL (asm_out_file
, name
);
6118 /* Remove this function from the pending weak list so that
6119 we do not emit multiple .weak directives for it. */
6120 for (p
= &weak_decls
; (t
= *p
) ; )
6122 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
6123 *p
= TREE_CHAIN (t
);
6125 p
= &TREE_CHAIN (t
);
6128 /* Remove weakrefs to the same target from the pending weakref
6129 list, for the same reason. */
6130 for (p
= &weakref_targets
; (t
= *p
) ; )
6132 if (DECL_ASSEMBLER_NAME (decl
)
6133 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
6134 *p
= TREE_CHAIN (t
);
6136 p
= &TREE_CHAIN (t
);
6143 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
6146 vec
<alias_pair
, va_gc
> *alias_pairs
;
6148 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
6149 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
6150 tree node is DECL to have the value of the tree node TARGET. */
6153 do_assemble_alias (tree decl
, tree target
)
6157 /* Emulated TLS had better not get this var. */
6158 gcc_assert (!(!targetm
.have_tls
6160 && DECL_THREAD_LOCAL_P (decl
)));
6162 if (TREE_ASM_WRITTEN (decl
))
6165 id
= DECL_ASSEMBLER_NAME (decl
);
6166 ultimate_transparent_alias_target (&id
);
6167 ultimate_transparent_alias_target (&target
);
6169 /* We must force creation of DECL_RTL for debug info generation, even though
6170 we don't use it here. */
6171 make_decl_rtl (decl
);
6173 TREE_ASM_WRITTEN (decl
) = 1;
6174 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
6175 TREE_ASM_WRITTEN (id
) = 1;
6177 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
6179 if (!TREE_SYMBOL_REFERENCED (target
))
6180 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
6182 #ifdef ASM_OUTPUT_WEAKREF
6183 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
6184 IDENTIFIER_POINTER (id
),
6185 IDENTIFIER_POINTER (target
));
6187 if (!TARGET_SUPPORTS_WEAK
)
6189 error_at (DECL_SOURCE_LOCATION (decl
),
6190 "%qs is not supported in this configuration", "weakref ");
6197 #ifdef ASM_OUTPUT_DEF
6198 tree orig_decl
= decl
;
6200 /* Make name accessible from other files, if appropriate. */
6202 if (TREE_PUBLIC (decl
) || TREE_PUBLIC (orig_decl
))
6204 globalize_decl (decl
);
6205 maybe_assemble_visibility (decl
);
6207 if (TREE_CODE (decl
) == FUNCTION_DECL
6208 && cgraph_node::get (decl
)->ifunc_resolver
)
6210 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
6211 if (targetm
.has_ifunc_p ())
6212 ASM_OUTPUT_TYPE_DIRECTIVE
6213 (asm_out_file
, IDENTIFIER_POINTER (id
),
6217 error_at (DECL_SOURCE_LOCATION (decl
),
6218 "%qs is not supported on this target", "ifunc");
6221 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
6222 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
6224 ASM_OUTPUT_DEF (asm_out_file
,
6225 IDENTIFIER_POINTER (id
),
6226 IDENTIFIER_POINTER (target
));
6228 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
6233 name
= IDENTIFIER_POINTER (id
);
6234 # ifdef ASM_WEAKEN_DECL
6235 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
6237 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
6239 /* Remove this function from the pending weak list so that
6240 we do not emit multiple .weak directives for it. */
6241 for (p
= &weak_decls
; (t
= *p
) ; )
6242 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
))
6243 || id
== DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
6244 *p
= TREE_CHAIN (t
);
6246 p
= &TREE_CHAIN (t
);
6248 /* Remove weakrefs to the same target from the pending weakref
6249 list, for the same reason. */
6250 for (p
= &weakref_targets
; (t
= *p
) ; )
6252 if (id
== ultimate_transparent_alias_target (&TREE_VALUE (t
)))
6253 *p
= TREE_CHAIN (t
);
6255 p
= &TREE_CHAIN (t
);
6261 /* Output .symver directive. */
6264 do_assemble_symver (tree decl
, tree target
)
6266 tree id
= DECL_ASSEMBLER_NAME (decl
);
6267 ultimate_transparent_alias_target (&id
);
6268 ultimate_transparent_alias_target (&target
);
6269 #ifdef ASM_OUTPUT_SYMVER_DIRECTIVE
6270 ASM_OUTPUT_SYMVER_DIRECTIVE (asm_out_file
,
6271 IDENTIFIER_POINTER (target
),
6272 IDENTIFIER_POINTER (id
));
6274 error ("symver is only supported on ELF platforms");
6278 /* Emit an assembler directive to make the symbol for DECL an alias to
6279 the symbol for TARGET. */
6282 assemble_alias (tree decl
, tree target
)
6286 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
6288 tree alias
= DECL_ASSEMBLER_NAME (decl
);
6290 ultimate_transparent_alias_target (&target
);
6292 if (alias
== target
)
6293 error ("%qs symbol %q+D ultimately targets itself", "weakref", decl
);
6294 if (TREE_PUBLIC (decl
))
6295 error ("%qs symbol %q+D must have static linkage", "weakref", decl
);
6299 #if !defined (ASM_OUTPUT_DEF)
6300 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
6301 error_at (DECL_SOURCE_LOCATION (decl
),
6302 "alias definitions not supported in this configuration");
6303 TREE_ASM_WRITTEN (decl
) = 1;
6306 if (!DECL_WEAK (decl
))
6308 /* NB: ifunc_resolver isn't set when an error is detected. */
6309 if (TREE_CODE (decl
) == FUNCTION_DECL
6310 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
6311 error_at (DECL_SOURCE_LOCATION (decl
),
6312 "%qs is not supported in this configuration", "ifunc");
6314 error_at (DECL_SOURCE_LOCATION (decl
),
6315 "only weak aliases are supported in this configuration");
6316 TREE_ASM_WRITTEN (decl
) = 1;
6322 TREE_USED (decl
) = 1;
6324 /* Allow aliases to aliases. */
6325 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6326 cgraph_node::get_create (decl
)->alias
= true;
6328 varpool_node::get_create (decl
)->alias
= true;
6330 /* If the target has already been emitted, we don't have to queue the
6331 alias. This saves a tad of memory. */
6332 if (symtab
->global_info_ready
)
6333 target_decl
= find_decl (target
);
6336 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
6337 || symtab
->state
>= EXPANSION
)
6338 do_assemble_alias (decl
, target
);
6341 alias_pair p
= {decl
, target
};
6342 vec_safe_push (alias_pairs
, p
);
6346 /* Record and output a table of translations from original function
6347 to its transaction aware clone. Note that tm_pure functions are
6348 considered to be their own clone. */
6350 struct tm_clone_hasher
: ggc_cache_ptr_hash
<tree_map
>
6352 static hashval_t
hash (tree_map
*m
) { return tree_map_hash (m
); }
6353 static bool equal (tree_map
*a
, tree_map
*b
) { return tree_map_eq (a
, b
); }
6356 keep_cache_entry (tree_map
*&e
)
6358 return ggc_marked_p (e
->base
.from
);
6362 static GTY((cache
)) hash_table
<tm_clone_hasher
> *tm_clone_hash
;
6365 record_tm_clone_pair (tree o
, tree n
)
6367 struct tree_map
**slot
, *h
;
6369 if (tm_clone_hash
== NULL
)
6370 tm_clone_hash
= hash_table
<tm_clone_hasher
>::create_ggc (32);
6372 h
= ggc_alloc
<tree_map
> ();
6373 h
->hash
= htab_hash_pointer (o
);
6377 slot
= tm_clone_hash
->find_slot_with_hash (h
, h
->hash
, INSERT
);
6382 get_tm_clone_pair (tree o
)
6386 struct tree_map
*h
, in
;
6389 in
.hash
= htab_hash_pointer (o
);
6390 h
= tm_clone_hash
->find_with_hash (&in
, in
.hash
);
6397 struct tm_alias_pair
6405 /* Dump the actual pairs to the .tm_clone_table section. */
6408 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
6412 bool switched
= false;
6414 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
6418 struct cgraph_node
*src_n
= cgraph_node::get (src
);
6419 struct cgraph_node
*dst_n
= cgraph_node::get (dst
);
6421 /* The function ipa_tm_create_version() marks the clone as needed if
6422 the original function was needed. But we also mark the clone as
6423 needed if we ever called the clone indirectly through
6424 TM_GETTMCLONE. If neither of these are true, we didn't generate
6425 a clone, and we didn't call it indirectly... no sense keeping it
6426 in the clone table. */
6427 if (!dst_n
|| !dst_n
->definition
)
6430 /* This covers the case where we have optimized the original
6431 function away, and only access the transactional clone. */
6432 if (!src_n
|| !src_n
->definition
)
6437 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
6438 assemble_align (POINTER_SIZE
);
6442 assemble_integer (XEXP (DECL_RTL (src
), 0),
6443 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
6444 assemble_integer (XEXP (DECL_RTL (dst
), 0),
6445 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
6449 /* Provide a default for the tm_clone_table section. */
6452 default_clone_table_section (void)
6454 return get_named_section (NULL
, ".tm_clone_table", 3);
6457 /* Helper comparison function for qsorting by the DECL_UID stored in
6458 alias_pair->emitted_diags. */
6461 tm_alias_pair_cmp (const void *x
, const void *y
)
6463 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
6464 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
6465 if (p1
->uid
< p2
->uid
)
6467 if (p1
->uid
> p2
->uid
)
6473 finish_tm_clone_pairs (void)
6475 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
6477 if (tm_clone_hash
== NULL
)
6480 /* We need a determenistic order for the .tm_clone_table, otherwise
6481 we will get bootstrap comparison failures, so dump the hash table
6482 to a vector, sort it, and dump the vector. */
6484 /* Dump the hashtable to a vector. */
6486 hash_table
<tm_clone_hasher
>::iterator iter
;
6487 FOR_EACH_HASH_TABLE_ELEMENT (*tm_clone_hash
, map
, tree_map
*, iter
)
6489 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
6490 tm_alias_pairs
.safe_push (p
);
6493 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
6496 dump_tm_clone_pairs (tm_alias_pairs
);
6498 tm_clone_hash
->empty ();
6499 tm_clone_hash
= NULL
;
6500 tm_alias_pairs
.release ();
6504 /* Emit an assembler directive to set symbol for DECL visibility to
6505 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
6508 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
6509 int vis ATTRIBUTE_UNUSED
)
6511 #ifdef HAVE_GAS_HIDDEN
6512 static const char * const visibility_types
[] = {
6513 NULL
, "protected", "hidden", "internal"
6516 const char *name
, *type
;
6519 id
= DECL_ASSEMBLER_NAME (decl
);
6520 ultimate_transparent_alias_target (&id
);
6521 name
= IDENTIFIER_POINTER (id
);
6523 type
= visibility_types
[vis
];
6525 fprintf (asm_out_file
, "\t.%s\t", type
);
6526 assemble_name (asm_out_file
, name
);
6527 fprintf (asm_out_file
, "\n");
6529 if (!DECL_ARTIFICIAL (decl
))
6530 warning (OPT_Wattributes
, "visibility attribute not supported "
6531 "in this configuration; ignored");
6535 /* A helper function to call assemble_visibility when needed for a decl. */
6538 maybe_assemble_visibility (tree decl
)
6540 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
6541 if (vis
!= VISIBILITY_DEFAULT
)
6543 targetm
.asm_out
.assemble_visibility (decl
, vis
);
6550 /* Returns true if the target configuration supports defining public symbols
6551 so that one of them will be chosen at link time instead of generating a
6552 multiply-defined symbol error, whether through the use of weak symbols or
6553 a target-specific mechanism for having duplicates discarded. */
6556 supports_one_only (void)
6558 if (SUPPORTS_ONE_ONLY
)
6560 if (TARGET_SUPPORTS_WEAK
)
6565 /* Set up DECL as a public symbol that can be defined in multiple
6566 translation units without generating a linker error. */
6569 make_decl_one_only (tree decl
, tree comdat_group
)
6571 struct symtab_node
*symbol
;
6572 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
6574 TREE_PUBLIC (decl
) = 1;
6577 symbol
= varpool_node::get_create (decl
);
6579 symbol
= cgraph_node::get_create (decl
);
6581 if (SUPPORTS_ONE_ONLY
)
6583 #ifdef MAKE_DECL_ONE_ONLY
6584 MAKE_DECL_ONE_ONLY (decl
);
6586 symbol
->set_comdat_group (comdat_group
);
6588 else if (VAR_P (decl
)
6589 && (DECL_INITIAL (decl
) == 0
6590 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6591 DECL_COMMON (decl
) = 1;
6594 gcc_assert (TARGET_SUPPORTS_WEAK
);
6595 DECL_WEAK (decl
) = 1;
6600 init_varasm_once (void)
6602 section_htab
= hash_table
<section_hasher
>::create_ggc (31);
6603 object_block_htab
= hash_table
<object_block_hasher
>::create_ggc (31);
6604 const_desc_htab
= hash_table
<tree_descriptor_hasher
>::create_ggc (1009);
6606 shared_constant_pool
= create_constant_pool ();
6608 #ifdef TEXT_SECTION_ASM_OP
6609 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
6610 TEXT_SECTION_ASM_OP
);
6613 #ifdef DATA_SECTION_ASM_OP
6614 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6615 DATA_SECTION_ASM_OP
);
6618 #ifdef SDATA_SECTION_ASM_OP
6619 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6620 SDATA_SECTION_ASM_OP
);
6623 #ifdef READONLY_DATA_SECTION_ASM_OP
6624 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
6625 READONLY_DATA_SECTION_ASM_OP
);
6628 #ifdef CTORS_SECTION_ASM_OP
6629 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
6630 CTORS_SECTION_ASM_OP
);
6633 #ifdef DTORS_SECTION_ASM_OP
6634 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
6635 DTORS_SECTION_ASM_OP
);
6638 #ifdef BSS_SECTION_ASM_OP
6639 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6640 output_section_asm_op
,
6641 BSS_SECTION_ASM_OP
);
6644 #ifdef SBSS_SECTION_ASM_OP
6645 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6646 output_section_asm_op
,
6647 SBSS_SECTION_ASM_OP
);
6650 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6651 | SECTION_COMMON
, emit_tls_common
);
6652 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6653 | SECTION_COMMON
, emit_local
);
6654 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6655 | SECTION_COMMON
, emit_common
);
6657 #if defined ASM_OUTPUT_ALIGNED_BSS
6658 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
6662 targetm
.asm_out
.init_sections ();
6664 if (readonly_data_section
== NULL
)
6665 readonly_data_section
= text_section
;
6667 #ifdef ASM_OUTPUT_EXTERNAL
6668 pending_assemble_externals_set
= new hash_set
<tree
>;
6672 /* Determine whether SYMBOL is used in any optimized function. */
6675 have_optimized_refs (struct symtab_node
*symbol
)
6677 struct ipa_ref
*ref
;
6679 for (int i
= 0; symbol
->iterate_referring (i
, ref
); i
++)
6681 cgraph_node
*cnode
= dyn_cast
<cgraph_node
*> (ref
->referring
);
6683 if (cnode
&& opt_for_fn (cnode
->decl
, optimize
))
6690 /* Check if promoting general-dynamic TLS access model to local-dynamic is
6691 desirable for DECL. */
6694 optimize_dyn_tls_for_decl_p (const_tree decl
)
6698 return symtab
->state
>= IPA
&& have_optimized_refs (symtab_node::get (decl
));
6703 decl_default_tls_model (const_tree decl
)
6705 enum tls_model kind
;
6708 is_local
= targetm
.binds_local_p (decl
);
6712 kind
= TLS_MODEL_LOCAL_EXEC
;
6714 kind
= TLS_MODEL_INITIAL_EXEC
;
6717 /* Local dynamic is inefficient when we're not combining the
6718 parts of the address. */
6719 else if (is_local
&& optimize_dyn_tls_for_decl_p (decl
))
6720 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
6722 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
6723 if (kind
< flag_tls_default
)
6724 kind
= flag_tls_default
;
6729 /* Select a set of attributes for section NAME based on the properties
6730 of DECL and whether or not RELOC indicates that DECL's initializer
6731 might contain runtime relocations.
6733 We make the section read-only and executable for a function decl,
6734 read-only for a const data decl, and writable for a non-const data decl. */
6737 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6741 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6742 flags
= SECTION_CODE
;
6745 enum section_category category
6746 = categorize_decl_for_section (decl
, reloc
);
6747 if (decl_readonly_section_1 (category
))
6749 else if (category
== SECCAT_DATA_REL_RO
6750 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6751 flags
= SECTION_WRITE
| SECTION_RELRO
;
6753 flags
= SECTION_WRITE
;
6757 flags
= SECTION_WRITE
;
6758 if (strcmp (name
, ".data.rel.ro") == 0
6759 || strcmp (name
, ".data.rel.ro.local") == 0)
6760 flags
|= SECTION_RELRO
;
6763 if (decl
&& DECL_P (decl
) && DECL_COMDAT_GROUP (decl
))
6764 flags
|= SECTION_LINKONCE
;
6766 if (strcmp (name
, ".vtable_map_vars") == 0)
6767 flags
|= SECTION_LINKONCE
;
6769 if (decl
&& VAR_P (decl
) && DECL_THREAD_LOCAL_P (decl
))
6770 flags
|= SECTION_TLS
| SECTION_WRITE
;
6772 if (strcmp (name
, ".bss") == 0
6773 || startswith (name
, ".bss.")
6774 || startswith (name
, ".gnu.linkonce.b.")
6775 || strcmp (name
, ".persistent.bss") == 0
6776 || strcmp (name
, ".sbss") == 0
6777 || startswith (name
, ".sbss.")
6778 || startswith (name
, ".gnu.linkonce.sb."))
6779 flags
|= SECTION_BSS
;
6781 if (strcmp (name
, ".tdata") == 0
6782 || startswith (name
, ".tdata.")
6783 || startswith (name
, ".gnu.linkonce.td."))
6784 flags
|= SECTION_TLS
;
6786 if (strcmp (name
, ".tbss") == 0
6787 || startswith (name
, ".tbss.")
6788 || startswith (name
, ".gnu.linkonce.tb."))
6789 flags
|= SECTION_TLS
| SECTION_BSS
;
6791 if (strcmp (name
, ".noinit") == 0)
6792 flags
|= SECTION_WRITE
| SECTION_BSS
| SECTION_NOTYPE
;
6794 if (strcmp (name
, ".persistent") == 0)
6795 flags
|= SECTION_WRITE
| SECTION_NOTYPE
;
6797 /* Various sections have special ELF types that the assembler will
6798 assign by default based on the name. They are neither SHT_PROGBITS
6799 nor SHT_NOBITS, so when changing sections we don't want to print a
6800 section type (@progbits or @nobits). Rather than duplicating the
6801 assembler's knowledge of what those special name patterns are, just
6802 let the assembler choose the type if we don't know a specific
6803 reason to set it to something other than the default. SHT_PROGBITS
6804 is the default for sections whose name is not specially known to
6805 the assembler, so it does no harm to leave the choice to the
6806 assembler when @progbits is the best thing we know to use. If
6807 someone is silly enough to emit code or TLS variables to one of
6808 these sections, then don't handle them specially.
6810 default_elf_asm_named_section (below) handles the BSS, TLS, ENTSIZE, and
6811 LINKONCE cases when NOTYPE is not set, so leave those to its logic. */
6812 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
| SECTION_ENTSIZE
))
6813 && !(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
)))
6814 flags
|= SECTION_NOTYPE
;
6819 /* Return true if the target supports some form of global BSS,
6820 either through bss_noswitch_section, or by selecting a BSS
6821 section in TARGET_ASM_SELECT_SECTION. */
6824 have_global_bss_p (void)
6826 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6829 /* Output assembly to switch to section NAME with attribute FLAGS.
6830 Four variants for common object file formats. */
6833 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6834 unsigned int flags ATTRIBUTE_UNUSED
,
6835 tree decl ATTRIBUTE_UNUSED
)
6837 /* Some object formats don't support named sections at all. The
6838 front-end should already have flagged this as an error. */
6842 #ifndef TLS_SECTION_ASM_FLAG
6843 #define TLS_SECTION_ASM_FLAG 'T'
6847 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6850 char flagchars
[11], *f
= flagchars
;
6851 unsigned int numeric_value
= 0;
6853 /* If we have already declared this section, we can use an
6854 abbreviated form to switch back to it -- unless this section is
6855 part of a COMDAT groups or with SHF_GNU_RETAIN or with SHF_LINK_ORDER,
6856 in which case GAS requires the full declaration every time. */
6857 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6858 && !(flags
& (SECTION_RETAIN
| SECTION_LINK_ORDER
))
6859 && (flags
& SECTION_DECLARED
))
6861 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6865 /* If we have a machine specific flag, then use the numeric value to pass
6867 if (targetm
.asm_out
.elf_flags_numeric (flags
, &numeric_value
))
6868 snprintf (f
, sizeof (flagchars
), "0x%08x", numeric_value
);
6871 if (!(flags
& SECTION_DEBUG
))
6873 #if HAVE_GAS_SECTION_EXCLUDE
6874 if (flags
& SECTION_EXCLUDE
)
6877 if (flags
& SECTION_WRITE
)
6879 if (flags
& SECTION_CODE
)
6881 if (flags
& SECTION_SMALL
)
6883 if (flags
& SECTION_MERGE
)
6885 if (flags
& SECTION_STRINGS
)
6887 if (flags
& SECTION_TLS
)
6888 *f
++ = TLS_SECTION_ASM_FLAG
;
6889 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6891 if (flags
& SECTION_RETAIN
)
6893 if (flags
& SECTION_LINK_ORDER
)
6895 #ifdef MACH_DEP_SECTION_ASM_FLAG
6896 if (flags
& SECTION_MACH_DEP
)
6897 *f
++ = MACH_DEP_SECTION_ASM_FLAG
;
6902 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6904 /* default_section_type_flags (above) knows which flags need special
6905 handling here, and sets NOTYPE when none of these apply so that the
6906 assembler's logic for default types can apply to user-chosen
6908 if (!(flags
& SECTION_NOTYPE
))
6913 if (flags
& SECTION_BSS
)
6919 /* On platforms that use "@" as the assembly comment character,
6921 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6923 fprintf (asm_out_file
, format
, type
);
6925 if (flags
& SECTION_ENTSIZE
)
6926 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6927 if (flags
& SECTION_LINK_ORDER
)
6929 /* For now, only section "__patchable_function_entries"
6930 adopts flag SECTION_LINK_ORDER, internal label LPFE*
6931 was emitted in default_print_patchable_function_entry,
6932 just place it here for linked_to section. */
6933 gcc_assert (!strcmp (name
, "__patchable_function_entries"));
6934 fprintf (asm_out_file
, ",");
6936 ASM_GENERATE_INTERNAL_LABEL (buf
, "LPFE",
6937 current_function_funcdef_no
);
6938 assemble_name_raw (asm_out_file
, buf
);
6940 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6942 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6943 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6945 fprintf (asm_out_file
, ",%s,comdat",
6946 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6950 putc ('\n', asm_out_file
);
6954 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6955 tree decl ATTRIBUTE_UNUSED
)
6957 char flagchars
[8], *f
= flagchars
;
6959 if (flags
& SECTION_WRITE
)
6961 if (flags
& SECTION_CODE
)
6965 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6969 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6972 default_coff_asm_named_section (name
, flags
, decl
);
6974 if (flags
& SECTION_LINKONCE
)
6976 /* Functions may have been compiled at various levels of
6977 optimization so we can't use `same_size' here.
6978 Instead, have the linker pick one. */
6979 fprintf (asm_out_file
, "\t.linkonce %s\n",
6980 (flags
& SECTION_CODE
? "discard" : "same_size"));
6984 /* The lame default section selector. */
6987 default_select_section (tree decl
, int reloc
,
6988 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6992 if (decl_readonly_section (decl
, reloc
))
6993 return readonly_data_section
;
6995 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6997 if (! ((flag_pic
&& reloc
)
6998 || !TREE_READONLY (decl
)
6999 || !TREE_CONSTANT (decl
)))
7000 return readonly_data_section
;
7002 else if (TREE_CODE (decl
) == STRING_CST
)
7003 return readonly_data_section
;
7004 else if (! (flag_pic
&& reloc
))
7005 return readonly_data_section
;
7007 return data_section
;
7010 enum section_category
7011 categorize_decl_for_section (const_tree decl
, int reloc
)
7013 enum section_category ret
;
7015 if (TREE_CODE (decl
) == FUNCTION_DECL
)
7017 else if (TREE_CODE (decl
) == STRING_CST
)
7019 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7020 && asan_protect_global (CONST_CAST_TREE (decl
)))
7021 /* or !flag_merge_constants */
7022 return SECCAT_RODATA
;
7024 return SECCAT_RODATA_MERGE_STR
;
7026 else if (VAR_P (decl
))
7028 tree d
= CONST_CAST_TREE (decl
);
7029 if (bss_initializer_p (decl
))
7031 else if (! TREE_READONLY (decl
)
7032 || (DECL_INITIAL (decl
)
7033 && ! TREE_CONSTANT (DECL_INITIAL (decl
))))
7035 /* Here the reloc_rw_mask is not testing whether the section should
7036 be read-only or not, but whether the dynamic link will have to
7037 do something. If so, we wish to segregate the data in order to
7038 minimize cache misses inside the dynamic linker. */
7039 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
7040 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
7044 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
7045 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
7046 else if (reloc
|| (flag_merge_constants
< 2 && !DECL_MERGEABLE (decl
))
7047 || ((flag_sanitize
& SANITIZE_ADDRESS
)
7048 /* PR 81697: for architectures that use section anchors we
7049 need to ignore DECL_RTL_SET_P (decl) for string constants
7050 inside this asan_protect_global call because otherwise
7051 we'll wrongly put them into SECCAT_RODATA_MERGE_CONST
7052 section, set DECL_RTL (decl) later on and add DECL to
7053 protected globals via successive asan_protect_global
7054 calls. In this scenario we'll end up with wrong
7055 alignment of these strings at runtime and possible ASan
7057 && asan_protect_global (d
, use_object_blocks_p ()
7058 && use_blocks_for_decl_p (d
))))
7059 /* C and C++ don't allow different variables to share the same
7060 location. -fmerge-all-constants allows even that (at the
7061 expense of not conforming). */
7062 ret
= SECCAT_RODATA
;
7063 else if (DECL_INITIAL (decl
)
7064 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
7065 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
7067 ret
= SECCAT_RODATA_MERGE_CONST
;
7069 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
7071 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
7072 || ! TREE_CONSTANT (decl
))
7075 ret
= SECCAT_RODATA
;
7078 ret
= SECCAT_RODATA
;
7080 /* There are no read-only thread-local sections. */
7081 if (VAR_P (decl
) && DECL_THREAD_LOCAL_P (decl
))
7083 /* Note that this would be *just* SECCAT_BSS, except that there's
7084 no concept of a read-only thread-local-data section. */
7085 if (ret
== SECCAT_BSS
7086 || DECL_INITIAL (decl
) == NULL
7087 || (flag_zero_initialized_in_bss
7088 && initializer_zerop (DECL_INITIAL (decl
))))
7094 /* If the target uses small data sections, select it. */
7095 else if (targetm
.in_small_data_p (decl
))
7097 if (ret
== SECCAT_BSS
)
7099 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
7100 ret
= SECCAT_SRODATA
;
7109 decl_readonly_section_1 (enum section_category category
)
7114 case SECCAT_RODATA_MERGE_STR
:
7115 case SECCAT_RODATA_MERGE_STR_INIT
:
7116 case SECCAT_RODATA_MERGE_CONST
:
7117 case SECCAT_SRODATA
:
7125 decl_readonly_section (const_tree decl
, int reloc
)
7127 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
7130 /* Select a section based on the above categorization. */
7133 default_elf_select_section (tree decl
, int reloc
,
7134 unsigned HOST_WIDE_INT align
)
7138 switch (categorize_decl_for_section (decl
, reloc
))
7141 /* We're not supposed to be called on FUNCTION_DECLs. */
7144 return readonly_data_section
;
7145 case SECCAT_RODATA_MERGE_STR
:
7146 return mergeable_string_section (decl
, align
, 0);
7147 case SECCAT_RODATA_MERGE_STR_INIT
:
7148 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
7149 case SECCAT_RODATA_MERGE_CONST
:
7150 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
7151 case SECCAT_SRODATA
:
7155 if (DECL_P (decl
) && DECL_PERSISTENT_P (decl
))
7157 sname
= ".persistent";
7160 return data_section
;
7161 case SECCAT_DATA_REL
:
7162 sname
= ".data.rel";
7164 case SECCAT_DATA_REL_LOCAL
:
7165 sname
= ".data.rel.local";
7167 case SECCAT_DATA_REL_RO
:
7168 sname
= ".data.rel.ro";
7170 case SECCAT_DATA_REL_RO_LOCAL
:
7171 sname
= ".data.rel.ro.local";
7180 if (DECL_P (decl
) && DECL_NOINIT_P (decl
))
7199 return get_named_section (decl
, sname
, reloc
);
7202 /* Construct a unique section name based on the decl name and the
7203 categorization performed above. */
7206 default_unique_section (tree decl
, int reloc
)
7208 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
7209 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
7210 const char *prefix
, *name
, *linkonce
;
7214 switch (categorize_decl_for_section (decl
, reloc
))
7217 prefix
= one_only
? ".t" : ".text";
7220 case SECCAT_RODATA_MERGE_STR
:
7221 case SECCAT_RODATA_MERGE_STR_INIT
:
7222 case SECCAT_RODATA_MERGE_CONST
:
7223 prefix
= one_only
? ".r" : ".rodata";
7225 case SECCAT_SRODATA
:
7226 prefix
= one_only
? ".s2" : ".sdata2";
7229 prefix
= one_only
? ".d" : ".data";
7230 if (DECL_P (decl
) && DECL_PERSISTENT_P (decl
))
7232 prefix
= one_only
? ".p" : ".persistent";
7236 case SECCAT_DATA_REL
:
7237 prefix
= one_only
? ".d.rel" : ".data.rel";
7239 case SECCAT_DATA_REL_LOCAL
:
7240 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
7242 case SECCAT_DATA_REL_RO
:
7243 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
7245 case SECCAT_DATA_REL_RO_LOCAL
:
7246 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
7249 prefix
= one_only
? ".s" : ".sdata";
7252 if (DECL_P (decl
) && DECL_NOINIT_P (decl
))
7254 prefix
= one_only
? ".n" : ".noinit";
7257 prefix
= one_only
? ".b" : ".bss";
7260 prefix
= one_only
? ".sb" : ".sbss";
7263 prefix
= one_only
? ".td" : ".tdata";
7266 prefix
= one_only
? ".tb" : ".tbss";
7272 id
= DECL_ASSEMBLER_NAME (decl
);
7273 ultimate_transparent_alias_target (&id
);
7274 name
= IDENTIFIER_POINTER (id
);
7275 name
= targetm
.strip_name_encoding (name
);
7277 /* If we're using one_only, then there needs to be a .gnu.linkonce
7278 prefix to the section name. */
7279 linkonce
= one_only
? ".gnu.linkonce" : "";
7281 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
7283 set_decl_section_name (decl
, string
);
7286 /* Subroutine of compute_reloc_for_rtx for leaf rtxes. */
7289 compute_reloc_for_rtx_1 (const_rtx x
)
7291 switch (GET_CODE (x
))
7294 return SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
7302 /* Like compute_reloc_for_constant, except for an RTX. The return value
7303 is a mask for which bit 1 indicates a global relocation, and bit 0
7304 indicates a local relocation. Used by default_select_rtx_section
7305 and default_elf_select_rtx_section. */
7308 compute_reloc_for_rtx (const_rtx x
)
7310 switch (GET_CODE (x
))
7314 return compute_reloc_for_rtx_1 (x
);
7319 subrtx_iterator::array_type array
;
7320 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
7321 reloc
|= compute_reloc_for_rtx_1 (*iter
);
7331 default_select_rtx_section (machine_mode mode ATTRIBUTE_UNUSED
,
7333 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
7335 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
7336 return data_section
;
7338 return readonly_data_section
;
7342 default_elf_select_rtx_section (machine_mode mode
, rtx x
,
7343 unsigned HOST_WIDE_INT align
)
7345 int reloc
= compute_reloc_for_rtx (x
);
7347 /* ??? Handle small data here somehow. */
7349 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
7352 return get_named_section (NULL
, ".data.rel.ro.local", 1);
7354 return get_named_section (NULL
, ".data.rel.ro", 3);
7357 return mergeable_constant_section (mode
, align
, 0);
7360 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
7363 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
7368 /* Careful not to prod global register variables. */
7371 symbol
= XEXP (rtl
, 0);
7372 if (GET_CODE (symbol
) != SYMBOL_REF
)
7375 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
7376 if (TREE_CODE (decl
) == FUNCTION_DECL
)
7377 flags
|= SYMBOL_FLAG_FUNCTION
;
7378 if (targetm
.binds_local_p (decl
))
7379 flags
|= SYMBOL_FLAG_LOCAL
;
7380 if (VAR_P (decl
) && DECL_THREAD_LOCAL_P (decl
))
7381 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
7382 else if (targetm
.in_small_data_p (decl
))
7383 flags
|= SYMBOL_FLAG_SMALL
;
7384 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
7385 being PUBLIC, the thing *must* be defined in this translation unit.
7386 Prevent this buglet from being propagated into rtl code as well. */
7387 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
7388 flags
|= SYMBOL_FLAG_EXTERNAL
;
7390 SYMBOL_REF_FLAGS (symbol
) = flags
;
7393 /* By default, we do nothing for encode_section_info, so we need not
7394 do anything but discard the '*' marker. */
7397 default_strip_name_encoding (const char *str
)
7399 return str
+ (*str
== '*');
7402 #ifdef ASM_OUTPUT_DEF
7403 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
7404 anchor relative to ".", the current section position. */
7407 default_asm_output_anchor (rtx symbol
)
7411 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
7412 SYMBOL_REF_BLOCK_OFFSET (symbol
));
7413 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
7417 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
7420 default_use_anchors_for_symbol_p (const_rtx symbol
)
7423 section
*sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
7425 /* This function should only be called with non-zero SYMBOL_REF_BLOCK,
7426 furthermore get_block_for_section should not create object blocks
7427 for mergeable sections. */
7428 gcc_checking_assert (sect
&& !(sect
->common
.flags
& SECTION_MERGE
));
7430 /* Don't use anchors for small data sections. The small data register
7431 acts as an anchor for such sections. */
7432 if (sect
->common
.flags
& SECTION_SMALL
)
7435 decl
= SYMBOL_REF_DECL (symbol
);
7436 if (decl
&& DECL_P (decl
))
7438 /* Don't use section anchors for decls that might be defined or
7439 usurped by other modules. */
7440 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
7443 /* Don't use section anchors for decls that will be placed in a
7444 small data section. */
7445 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
7446 one above. The problem is that we only use SECTION_SMALL for
7447 sections that should be marked as small in the section directive. */
7448 if (targetm
.in_small_data_p (decl
))
7451 /* Don't use section anchors for decls that won't fit inside a single
7452 anchor range to reduce the amount of instructions required to refer
7453 to the entire declaration. */
7454 if (DECL_SIZE_UNIT (decl
) == NULL_TREE
7455 || !tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
))
7456 || (tree_to_uhwi (DECL_SIZE_UNIT (decl
))
7457 >= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
))
7464 /* Return true when RESOLUTION indicate that symbol will be bound to the
7465 definition provided by current .o file. */
7468 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
7470 return (resolution
== LDPR_PREVAILING_DEF
7471 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
7472 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
7475 /* Return true when RESOLUTION indicate that symbol will be bound locally
7476 within current executable or DSO. */
7479 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
7481 return (resolution
== LDPR_PREVAILING_DEF
7482 || resolution
== LDPR_PREVAILING_DEF_IRONLY
7483 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
7484 || resolution
== LDPR_PREEMPTED_REG
7485 || resolution
== LDPR_PREEMPTED_IR
7486 || resolution
== LDPR_RESOLVED_IR
7487 || resolution
== LDPR_RESOLVED_EXEC
);
7490 /* COMMON_LOCAL_P is true means that the linker can guarantee that an
7491 uninitialized common symbol in the executable will still be defined
7492 (through COPY relocation) in the executable. */
7495 default_binds_local_p_3 (const_tree exp
, bool shlib
, bool weak_dominate
,
7496 bool extern_protected_data
, bool common_local_p
)
7498 /* A non-decl is an entry in the constant pool. */
7502 /* Weakrefs may not bind locally, even though the weakref itself is always
7503 static and therefore local. Similarly, the resolver for ifunc functions
7504 might resolve to a non-local function.
7505 FIXME: We can resolve the weakref case more curefuly by looking at the
7507 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
7508 || (!targetm
.ifunc_ref_local_ok ()
7509 && TREE_CODE (exp
) == FUNCTION_DECL
7510 && cgraph_node::get (exp
)
7511 && cgraph_node::get (exp
)->ifunc_resolver
))
7514 /* Static variables are always local. */
7515 if (! TREE_PUBLIC (exp
))
7518 /* With resolution file in hand, take look into resolutions.
7519 We can't just return true for resolved_locally symbols,
7520 because dynamic linking might overwrite symbols
7521 in shared libraries. */
7522 bool resolved_locally
= false;
7524 bool uninited_common
= (DECL_COMMON (exp
)
7525 && (DECL_INITIAL (exp
) == NULL
7527 && DECL_INITIAL (exp
) == error_mark_node
)));
7529 /* A non-external variable is defined locally only if it isn't
7530 uninitialized COMMON variable or common_local_p is true. */
7531 bool defined_locally
= (!DECL_EXTERNAL (exp
)
7532 && (!uninited_common
|| common_local_p
));
7533 if (symtab_node
*node
= symtab_node::get (exp
))
7535 if (node
->in_other_partition
)
7536 defined_locally
= true;
7537 if (node
->can_be_discarded_p ())
7539 else if (resolution_to_local_definition_p (node
->resolution
))
7540 defined_locally
= resolved_locally
= true;
7541 else if (resolution_local_p (node
->resolution
))
7542 resolved_locally
= true;
7544 if (defined_locally
&& weak_dominate
&& !shlib
)
7545 resolved_locally
= true;
7547 /* Undefined weak symbols are never defined locally. */
7548 if (DECL_WEAK (exp
) && !defined_locally
)
7551 /* A symbol is local if the user has said explicitly that it will be,
7552 or if we have a definition for the symbol. We cannot infer visibility
7553 for undefined symbols. */
7554 if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
7555 && (TREE_CODE (exp
) == FUNCTION_DECL
7556 || !extern_protected_data
7557 || DECL_VISIBILITY (exp
) != VISIBILITY_PROTECTED
)
7558 && (DECL_VISIBILITY_SPECIFIED (exp
) || defined_locally
))
7561 /* If PIC, then assume that any global name can be overridden by
7562 symbols resolved from other modules. */
7566 /* Variables defined outside this object might not be local. */
7567 if (DECL_EXTERNAL (exp
) && !resolved_locally
)
7570 /* Non-dominant weak symbols are not defined locally. */
7571 if (DECL_WEAK (exp
) && !resolved_locally
)
7574 /* Uninitialized COMMON variable may be unified with symbols
7575 resolved from other modules. */
7576 if (uninited_common
&& !resolved_locally
)
7579 /* Otherwise we're left with initialized (or non-common) global data
7580 which is of necessity defined locally. */
7584 /* Assume ELF-ish defaults, since that's pretty much the most liberal
7585 wrt cross-module name binding. */
7588 default_binds_local_p (const_tree exp
)
7590 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, false, false);
7593 /* Similar to default_binds_local_p, but common symbol may be local and
7594 extern protected data is non-local. */
7597 default_binds_local_p_2 (const_tree exp
)
7599 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, true,
7604 default_binds_local_p_1 (const_tree exp
, int shlib
)
7606 return default_binds_local_p_3 (exp
, shlib
!= 0, false, false, false);
7609 /* Return true when references to DECL must bind to current definition in
7612 The condition is usually equivalent to whether the function binds to the
7613 current module (shared library or executable), that is to binds_local_p.
7614 We use this fact to avoid need for another target hook and implement
7615 the logic using binds_local_p and just special cases where
7616 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
7617 the weak definitions (that can be overwritten at linktime by other
7618 definition from different object file) and when resolution info is available
7619 we simply use the knowledge passed to us by linker plugin. */
7621 decl_binds_to_current_def_p (const_tree decl
)
7623 gcc_assert (DECL_P (decl
));
7624 if (!targetm
.binds_local_p (decl
))
7626 if (!TREE_PUBLIC (decl
))
7629 /* When resolution is available, just use it. */
7630 if (symtab_node
*node
= symtab_node::get (decl
))
7632 if (node
->resolution
!= LDPR_UNKNOWN
7633 && !node
->can_be_discarded_p ())
7634 return resolution_to_local_definition_p (node
->resolution
);
7637 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
7638 binds locally but still can be overwritten), DECL_COMMON (can be merged
7639 with a non-common definition somewhere in the same module) or
7641 This rely on fact that binds_local_p behave as decl_replaceable_p
7642 for all other declaration types. */
7643 if (DECL_WEAK (decl
))
7645 if (DECL_COMMON (decl
)
7646 && (DECL_INITIAL (decl
) == NULL
7647 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
7649 if (DECL_EXTERNAL (decl
))
7654 /* A replaceable function or variable is one which may be replaced
7655 at link-time with an entirely different definition, provided that the
7656 replacement has the same type. For example, functions declared
7657 with __attribute__((weak)) on most systems are replaceable.
7658 If SEMANTIC_INTERPOSITION_P is false allow interposition only on
7659 symbols explicitly declared weak.
7661 COMDAT functions are not replaceable, since all definitions of the
7662 function must be equivalent. It is important that COMDAT functions
7663 not be treated as replaceable so that use of C++ template
7664 instantiations is not penalized. */
7667 decl_replaceable_p (tree decl
, bool semantic_interposition_p
)
7669 gcc_assert (DECL_P (decl
));
7670 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
7672 if (!semantic_interposition_p
7673 && !DECL_WEAK (decl
))
7675 return !decl_binds_to_current_def_p (decl
);
7678 /* Default function to output code that will globalize a label. A
7679 target must define GLOBAL_ASM_OP or provide its own function to
7680 globalize a label. */
7681 #ifdef GLOBAL_ASM_OP
7683 default_globalize_label (FILE * stream
, const char *name
)
7685 fputs (GLOBAL_ASM_OP
, stream
);
7686 assemble_name (stream
, name
);
7687 putc ('\n', stream
);
7689 #endif /* GLOBAL_ASM_OP */
7691 /* Default function to output code that will globalize a declaration. */
7693 default_globalize_decl_name (FILE * stream
, tree decl
)
7695 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
7696 targetm
.asm_out
.globalize_label (stream
, name
);
7699 /* Default function to output a label for unwind information. The
7700 default is to do nothing. A target that needs nonlocal labels for
7701 unwind information must provide its own function to do this. */
7703 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
7704 tree decl ATTRIBUTE_UNUSED
,
7705 int for_eh ATTRIBUTE_UNUSED
,
7706 int empty ATTRIBUTE_UNUSED
)
7710 /* Default function to output a label to divide up the exception table.
7711 The default is to do nothing. A target that needs/wants to divide
7712 up the table must provide it's own function to do this. */
7714 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
7718 /* This is how to output an internal numbered label where PREFIX is
7719 the class of label and LABELNO is the number within the class. */
7722 default_generate_internal_label (char *buf
, const char *prefix
,
7723 unsigned long labelno
)
7725 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7728 /* This is how to output an internal numbered label where PREFIX is
7729 the class of label and LABELNO is the number within the class. */
7732 default_internal_label (FILE *stream
, const char *prefix
,
7733 unsigned long labelno
)
7735 char *const buf
= (char *) alloca (40 + strlen (prefix
));
7736 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7737 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
7741 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
7744 default_asm_declare_constant_name (FILE *file
, const char *name
,
7745 const_tree exp ATTRIBUTE_UNUSED
,
7746 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
7748 assemble_label (file
, name
);
7751 /* This is the default behavior at the beginning of a file. It's
7752 controlled by two other target-hook toggles. */
7754 default_file_start (void)
7756 if (targetm
.asm_file_start_app_off
7757 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
7758 fputs (ASM_APP_OFF
, asm_out_file
);
7760 if (targetm
.asm_file_start_file_directive
)
7762 /* LTO produced units have no meaningful main_input_filename. */
7764 output_file_directive (asm_out_file
, "<artificial>");
7766 output_file_directive (asm_out_file
, main_input_filename
);
7770 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
7771 which emits a special section directive used to indicate whether or
7772 not this object file needs an executable stack. This is primarily
7773 a GNU extension to ELF but could be used on other targets. */
7775 int trampolines_created
;
7778 file_end_indicate_exec_stack (void)
7780 unsigned int flags
= SECTION_DEBUG
;
7781 if (trampolines_created
)
7782 flags
|= SECTION_CODE
;
7784 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
7787 /* Emit a special section directive to indicate that this object file
7788 was compiled with -fsplit-stack. This is used to let the linker
7789 detect calls between split-stack code and non-split-stack code, so
7790 that it can modify the split-stack code to allocate a sufficiently
7791 large stack. We emit another special section if there are any
7792 functions in this file which have the no_split_stack attribute, to
7793 prevent the linker from warning about being unable to convert the
7794 functions if they call non-split-stack code. */
7797 file_end_indicate_split_stack (void)
7799 if (flag_split_stack
)
7801 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
7803 if (saw_no_split_stack
)
7804 switch_to_section (get_section (".note.GNU-no-split-stack",
7805 SECTION_DEBUG
, NULL
));
7809 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
7810 a get_unnamed_section callback. */
7813 output_section_asm_op (const char *directive
)
7815 fprintf (asm_out_file
, "%s\n", directive
);
7818 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
7819 the current section is NEW_SECTION. */
7822 switch_to_section (section
*new_section
, tree decl
)
7825 if ((new_section
->common
.flags
& SECTION_NAMED
)
7828 && ((retain_p
= !!lookup_attribute ("retain",
7829 DECL_ATTRIBUTES (decl
)))
7830 != !!(new_section
->common
.flags
& SECTION_RETAIN
)))
7832 /* If the SECTION_RETAIN bit doesn't match, switch to a new
7834 tree used_decl
, no_used_decl
;
7838 new_section
->common
.flags
|= SECTION_RETAIN
;
7840 no_used_decl
= new_section
->named
.decl
;
7844 new_section
->common
.flags
&= ~(SECTION_RETAIN
7845 | SECTION_DECLARED
);
7846 used_decl
= new_section
->named
.decl
;
7847 no_used_decl
= decl
;
7849 if (no_used_decl
!= used_decl
)
7851 warning (OPT_Wattributes
,
7852 "%+qD without %<retain%> attribute and %qD with "
7853 "%<retain%> attribute are placed in a section with "
7854 "the same name", no_used_decl
, used_decl
);
7855 inform (DECL_SOURCE_LOCATION (used_decl
),
7856 "%qD was declared here", used_decl
);
7859 else if (in_section
== new_section
)
7862 in_section
= new_section
;
7864 switch (SECTION_STYLE (new_section
))
7867 targetm
.asm_out
.named_section (new_section
->named
.name
,
7868 new_section
->named
.common
.flags
,
7869 new_section
->named
.decl
);
7872 case SECTION_UNNAMED
:
7873 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
7876 case SECTION_NOSWITCH
:
7881 new_section
->common
.flags
|= SECTION_DECLARED
;
7884 /* If block symbol SYMBOL has not yet been assigned an offset, place
7885 it at the end of its block. */
7888 place_block_symbol (rtx symbol
)
7890 unsigned HOST_WIDE_INT size
, mask
, offset
;
7891 class constant_descriptor_rtx
*desc
;
7892 unsigned int alignment
;
7893 struct object_block
*block
;
7896 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7897 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7900 /* Work out the symbol's size and alignment. */
7901 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7903 desc
= SYMBOL_REF_CONSTANT (symbol
);
7904 alignment
= desc
->align
;
7905 size
= GET_MODE_SIZE (desc
->mode
);
7907 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7909 decl
= SYMBOL_REF_DECL (symbol
);
7910 gcc_checking_assert (DECL_IN_CONSTANT_POOL (decl
));
7911 alignment
= DECL_ALIGN (decl
);
7912 size
= get_constant_size (DECL_INITIAL (decl
));
7913 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7914 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7915 && asan_protect_global (DECL_INITIAL (decl
)))
7917 size
+= asan_red_zone_size (size
);
7918 alignment
= MAX (alignment
,
7919 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7924 struct symtab_node
*snode
;
7925 decl
= SYMBOL_REF_DECL (symbol
);
7927 snode
= symtab_node::get (decl
);
7930 rtx target
= DECL_RTL (snode
->ultimate_alias_target ()->decl
);
7932 gcc_assert (MEM_P (target
)
7933 && GET_CODE (XEXP (target
, 0)) == SYMBOL_REF
7934 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (target
, 0)));
7935 target
= XEXP (target
, 0);
7936 place_block_symbol (target
);
7937 SYMBOL_REF_BLOCK_OFFSET (symbol
) = SYMBOL_REF_BLOCK_OFFSET (target
);
7940 alignment
= get_variable_align (decl
);
7941 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7942 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7943 && asan_protect_global (decl
))
7945 size
+= asan_red_zone_size (size
);
7946 alignment
= MAX (alignment
,
7947 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7951 /* Calculate the object's offset from the start of the block. */
7952 block
= SYMBOL_REF_BLOCK (symbol
);
7953 mask
= alignment
/ BITS_PER_UNIT
- 1;
7954 offset
= (block
->size
+ mask
) & ~mask
;
7955 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7957 /* Record the block's new alignment and size. */
7958 block
->alignment
= MAX (block
->alignment
, alignment
);
7959 block
->size
= offset
+ size
;
7961 vec_safe_push (block
->objects
, symbol
);
7964 /* Return the anchor that should be used to address byte offset OFFSET
7965 from the first object in BLOCK. MODEL is the TLS model used
7969 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7970 enum tls_model model
)
7973 unsigned int begin
, middle
, end
;
7974 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7977 /* Work out the anchor's offset. Use an offset of 0 for the first
7978 anchor so that we don't pessimize the case where we take the address
7979 of a variable at the beginning of the block. This is particularly
7980 useful when a block has only one variable assigned to it.
7982 We try to place anchors RANGE bytes apart, so there can then be
7983 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7984 a ptr_mode offset. With some target settings, the lowest such
7985 anchor might be out of range for the lowest ptr_mode offset;
7986 likewise the highest anchor for the highest offset. Use anchors
7987 at the extreme ends of the ptr_mode range in such cases.
7989 All arithmetic uses unsigned integers in order to avoid
7991 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7992 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7993 range
= max_offset
- min_offset
+ 1;
7998 bias
= HOST_WIDE_INT_1U
<< (GET_MODE_BITSIZE (ptr_mode
) - 1);
8001 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
8002 delta
-= delta
% range
;
8005 offset
= (HOST_WIDE_INT
) (-delta
);
8009 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
8010 delta
-= delta
% range
;
8011 if (delta
> bias
- 1)
8013 offset
= (HOST_WIDE_INT
) delta
;
8017 /* Do a binary search to see if there's already an anchor we can use.
8018 Set BEGIN to the new anchor's index if not. */
8020 end
= vec_safe_length (block
->anchors
);
8021 while (begin
!= end
)
8023 middle
= (end
+ begin
) / 2;
8024 anchor
= (*block
->anchors
)[middle
];
8025 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
8027 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
8029 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
8031 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
8037 /* Create a new anchor with a unique label. */
8038 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
8039 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
8040 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
8041 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
8043 /* Insert it at index BEGIN. */
8044 vec_safe_insert (block
->anchors
, begin
, anchor
);
8048 /* Output the objects in BLOCK. */
8051 output_object_block (struct object_block
*block
)
8053 class constant_descriptor_rtx
*desc
;
8055 HOST_WIDE_INT offset
;
8059 if (!block
->objects
)
8062 /* Switch to the section and make sure that the first byte is
8063 suitably aligned. */
8064 /* Special case VTV comdat sections similar to assemble_variable. */
8065 if (SECTION_STYLE (block
->sect
) == SECTION_NAMED
8066 && block
->sect
->named
.name
8067 && (strcmp (block
->sect
->named
.name
, ".vtable_map_vars") == 0))
8068 handle_vtv_comdat_section (block
->sect
, block
->sect
->named
.decl
);
8070 switch_to_section (block
->sect
, SYMBOL_REF_DECL ((*block
->objects
)[0]));
8072 gcc_checking_assert (!(block
->sect
->common
.flags
& SECTION_MERGE
));
8073 assemble_align (block
->alignment
);
8075 /* Define the values of all anchors relative to the current section
8077 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
8078 targetm
.asm_out
.output_anchor (symbol
);
8080 /* Output the objects themselves. */
8082 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
8084 /* Move to the object's offset, padding with zeros if necessary. */
8085 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
8086 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
8087 if (CONSTANT_POOL_ADDRESS_P (symbol
))
8089 desc
= SYMBOL_REF_CONSTANT (symbol
);
8090 /* Pass 1 for align as we have already laid out everything in the block.
8091 So aligning shouldn't be necessary. */
8092 output_constant_pool_1 (desc
, 1);
8093 offset
+= GET_MODE_SIZE (desc
->mode
);
8095 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
8098 decl
= SYMBOL_REF_DECL (symbol
);
8099 assemble_constant_contents (DECL_INITIAL (decl
), XSTR (symbol
, 0),
8100 DECL_ALIGN (decl
), false);
8102 size
= get_constant_size (DECL_INITIAL (decl
));
8104 if ((flag_sanitize
& SANITIZE_ADDRESS
)
8105 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
8106 && asan_protect_global (DECL_INITIAL (decl
)))
8108 size
= asan_red_zone_size (size
);
8109 assemble_zeros (size
);
8116 decl
= SYMBOL_REF_DECL (symbol
);
8117 assemble_variable_contents (decl
, XSTR (symbol
, 0), false, false);
8118 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
8120 if ((flag_sanitize
& SANITIZE_ADDRESS
)
8121 && asan_protect_global (decl
))
8123 size
= asan_red_zone_size (size
);
8124 assemble_zeros (size
);
8131 /* A callback for qsort to compare object_blocks. */
8134 output_object_block_compare (const void *x
, const void *y
)
8136 object_block
*p1
= *(object_block
* const*)x
;
8137 object_block
*p2
= *(object_block
* const*)y
;
8139 if (p1
->sect
->common
.flags
& SECTION_NAMED
8140 && !(p2
->sect
->common
.flags
& SECTION_NAMED
))
8143 if (!(p1
->sect
->common
.flags
& SECTION_NAMED
)
8144 && p2
->sect
->common
.flags
& SECTION_NAMED
)
8147 if (p1
->sect
->common
.flags
& SECTION_NAMED
8148 && p2
->sect
->common
.flags
& SECTION_NAMED
)
8149 return strcmp (p1
->sect
->named
.name
, p2
->sect
->named
.name
);
8151 unsigned f1
= p1
->sect
->common
.flags
;
8152 unsigned f2
= p2
->sect
->common
.flags
;
8155 return f1
< f2
? -1 : 1;
8158 /* Output the definitions of all object_blocks. */
8161 output_object_blocks (void)
8163 vec
<object_block
*, va_heap
> v
;
8164 v
.create (object_block_htab
->elements ());
8166 hash_table
<object_block_hasher
>::iterator hi
;
8168 FOR_EACH_HASH_TABLE_ELEMENT (*object_block_htab
, obj
, object_block
*, hi
)
8171 /* Sort them in order to output them in a deterministic manner,
8172 otherwise we may get .rodata sections in different orders with
8174 v
.qsort (output_object_block_compare
);
8176 FOR_EACH_VEC_ELT (v
, i
, obj
)
8177 output_object_block (obj
);
8182 /* This function provides a possible implementation of the
8183 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
8184 by -frecord-gcc-switches it creates a new mergeable, string section in the
8185 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
8186 contains the switches in ASCII format.
8188 FIXME: This code does not correctly handle double quote characters
8189 that appear inside strings, (it strips them rather than preserving them).
8190 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
8191 characters - instead it treats them as sub-string separators. Since
8192 we want to emit NUL strings terminators into the object file we have to use
8196 elf_record_gcc_switches (const char *options
)
8198 section
*sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
8199 SECTION_DEBUG
| SECTION_MERGE
8200 | SECTION_STRINGS
| (SECTION_ENTSIZE
& 1), NULL
);
8201 switch_to_section (sec
);
8202 ASM_OUTPUT_ASCII (asm_out_file
, options
, strlen (options
) + 1);
8205 /* Emit text to declare externally defined symbols. It is needed to
8206 properly support non-default visibility. */
8208 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
8210 const char *name ATTRIBUTE_UNUSED
)
8212 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
8213 set in order to avoid putting out names that are never really
8214 used. Always output visibility specified in the source. */
8215 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
8216 && (DECL_VISIBILITY_SPECIFIED (decl
)
8217 || targetm
.binds_local_p (decl
)))
8218 maybe_assemble_visibility (decl
);
8221 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
8224 default_asm_output_source_filename (FILE *file
, const char *name
)
8226 #ifdef ASM_OUTPUT_SOURCE_FILENAME
8227 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
8229 fprintf (file
, "\t.file\t");
8230 output_quoted_string (file
, name
);
8235 /* Output a file name in the form wanted by System V. */
8238 output_file_directive (FILE *asm_file
, const char *input_name
)
8243 if (input_name
== NULL
)
8244 input_name
= "<stdin>";
8246 input_name
= remap_debug_filename (input_name
);
8248 len
= strlen (input_name
);
8249 na
= input_name
+ len
;
8251 /* NA gets INPUT_NAME sans directory names. */
8252 while (na
> input_name
)
8254 if (IS_DIR_SEPARATOR (na
[-1]))
8259 targetm
.asm_out
.output_source_filename (asm_file
, na
);
8262 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
8265 make_debug_expr_from_rtl (const_rtx exp
)
8267 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
8268 machine_mode mode
= GET_MODE (exp
);
8271 DECL_ARTIFICIAL (ddecl
) = 1;
8272 if (REG_P (exp
) && REG_EXPR (exp
))
8273 type
= TREE_TYPE (REG_EXPR (exp
));
8274 else if (MEM_P (exp
) && MEM_EXPR (exp
))
8275 type
= TREE_TYPE (MEM_EXPR (exp
));
8278 if (type
&& TYPE_MODE (type
) == mode
)
8279 TREE_TYPE (ddecl
) = type
;
8281 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
8282 SET_DECL_MODE (ddecl
, mode
);
8283 dval
= gen_rtx_DEBUG_EXPR (mode
);
8284 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
8285 SET_DECL_RTL (ddecl
, dval
);
8289 #ifdef ELF_ASCII_ESCAPES
8290 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
8293 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
8298 fputs (STRING_ASM_OP
, f
);
8303 escape
= ELF_ASCII_ESCAPES
[c
];
8311 putc ('0'+((c
>>6)&7), f
);
8312 putc ('0'+((c
>>3)&7), f
);
8313 putc ('0'+(c
&7), f
);
8326 /* Default ASM_OUTPUT_ASCII for ELF targets. */
8329 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
8331 const char *limit
= s
+ len
;
8332 const char *last_null
= NULL
;
8333 unsigned bytes_in_chunk
= 0;
8337 for (; s
< limit
; s
++)
8341 if (bytes_in_chunk
>= 60)
8350 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
8357 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
8359 if (bytes_in_chunk
> 0)
8366 default_elf_asm_output_limited_string (f
, s
);
8371 if (bytes_in_chunk
== 0)
8372 fputs (ASCII_DATA_ASM_OP
"\"", f
);
8375 escape
= ELF_ASCII_ESCAPES
[c
];
8384 putc ('0'+((c
>>6)&7), f
);
8385 putc ('0'+((c
>>3)&7), f
);
8386 putc ('0'+(c
&7), f
);
8387 bytes_in_chunk
+= 4;
8392 bytes_in_chunk
+= 2;
8399 if (bytes_in_chunk
> 0)
8407 static GTY(()) section
*elf_init_array_section
;
8408 static GTY(()) section
*elf_fini_array_section
;
8411 get_elf_initfini_array_priority_section (int priority
,
8415 if (priority
!= DEFAULT_INIT_PRIORITY
)
8418 sprintf (buf
, "%s.%.5u",
8419 constructor_p
? ".init_array" : ".fini_array",
8421 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
8427 if (elf_init_array_section
== NULL
)
8428 elf_init_array_section
8429 = get_section (".init_array",
8430 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
8431 sec
= elf_init_array_section
;
8435 if (elf_fini_array_section
== NULL
)
8436 elf_fini_array_section
8437 = get_section (".fini_array",
8438 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
8439 sec
= elf_fini_array_section
;
8445 /* Use .init_array section for constructors. */
8448 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
8450 section
*sec
= get_elf_initfini_array_priority_section (priority
,
8452 assemble_addr_to_section (symbol
, sec
);
8455 /* Use .fini_array section for destructors. */
8458 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
8460 section
*sec
= get_elf_initfini_array_priority_section (priority
,
8462 assemble_addr_to_section (symbol
, sec
);
8465 /* Default TARGET_ASM_OUTPUT_IDENT hook.
8467 This is a bit of a cheat. The real default is a no-op, but this
8468 hook is the default for all targets with a .ident directive. */
8471 default_asm_output_ident_directive (const char *ident_str
)
8473 const char *ident_asm_op
= "\t.ident\t";
8475 /* If we are still in the front end, do not write out the string
8476 to asm_out_file. Instead, add a fake top-level asm statement.
8477 This allows the front ends to use this hook without actually
8478 writing to asm_out_file, to handle #ident or Pragma Ident. */
8479 if (symtab
->state
== PARSING
)
8481 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
8482 symtab
->finalize_toplevel_asm (build_string (strlen (buf
), buf
));
8485 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
8488 /* Switch to a COMDAT section with COMDAT name of decl.
8490 FIXME: resolve_unique_section needs to deal better with
8491 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
8492 that is fixed, this if-else statement can be replaced with
8493 a single call to "switch_to_section (sect)". */
8496 switch_to_comdat_section (section
*sect
, tree decl
)
8498 #if defined (OBJECT_FORMAT_ELF)
8499 targetm
.asm_out
.named_section (sect
->named
.name
,
8500 sect
->named
.common
.flags
8505 /* Neither OBJECT_FORMAT_PE, nor OBJECT_FORMAT_COFF is set here.
8506 Therefore the following check is used.
8507 In case a the target is PE or COFF a comdat group section
8508 is created, e.g. .vtable_map_vars$foo. The linker places
8509 everything in .vtable_map_vars at the end.
8511 A fix could be made in
8512 gcc/config/i386/winnt.cc: i386_pe_unique_section. */
8517 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
8518 name
= ACONCAT ((sect
->named
.name
, "$",
8519 IDENTIFIER_POINTER (decl
), NULL
));
8521 name
= ACONCAT ((sect
->named
.name
, "$",
8522 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)),
8525 targetm
.asm_out
.named_section (name
,
8526 sect
->named
.common
.flags
8532 switch_to_section (sect
);
8536 /* This function ensures that vtable_map variables are not only
8537 in the comdat section, but that each variable has its own unique
8538 comdat name. Without this the variables end up in the same section
8539 with a single comdat name. */
8542 handle_vtv_comdat_section (section
*sect
, const_tree decl ATTRIBUTE_UNUSED
)
8544 switch_to_comdat_section(sect
, DECL_NAME (decl
));
8547 #include "gt-varasm.h"