1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987-2020 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"
52 #include "langhooks.h"
54 #include "common/common-target.h"
55 #include "stringpool.h"
59 #include "file-prefix-map.h" /* remap_debug_filename() */
60 #include "alloc-pool.h"
62 #ifdef XCOFF_DEBUGGING_INFO
63 #include "xcoffout.h" /* Needed for external data declarations. */
66 /* The (assembler) name of the first globally-visible object output. */
67 extern GTY(()) const char *first_global_object_name
;
68 extern GTY(()) const char *weak_global_object_name
;
70 const char *first_global_object_name
;
71 const char *weak_global_object_name
;
74 class constant_descriptor_rtx
;
75 struct rtx_constant_pool
;
77 #define n_deferred_constants (crtl->varasm.deferred_constants)
79 /* Number for making the label on the next
80 constant that is stored in memory. */
82 static GTY(()) int const_labelno
;
84 /* Carry information from ASM_DECLARE_OBJECT_NAME
85 to ASM_FINISH_DECLARE_OBJECT. */
87 int size_directive_output
;
89 /* The last decl for which assemble_variable was called,
90 if it did ASM_DECLARE_OBJECT_NAME.
91 If the last call to assemble_variable didn't do that,
94 tree last_assemble_variable_decl
;
96 /* The following global variable indicates if the first basic block
97 in a function belongs to the cold partition or not. */
99 bool first_function_block_is_cold
;
101 /* Whether we saw any functions with no_split_stack. */
103 static bool saw_no_split_stack
;
105 static const char *strip_reg_name (const char *);
106 static int contains_pointers_p (tree
);
107 #ifdef ASM_OUTPUT_EXTERNAL
108 static bool incorporeal_function_p (tree
);
110 static void decode_addr_const (tree
, class addr_const
*);
111 static hashval_t
const_hash_1 (const tree
);
112 static int compare_constant (const tree
, const tree
);
113 static void output_constant_def_contents (rtx
);
114 static void output_addressed_constants (tree
, int);
115 static unsigned HOST_WIDE_INT
output_constant (tree
, unsigned HOST_WIDE_INT
,
116 unsigned int, bool, bool);
117 static void globalize_decl (tree
);
118 static bool decl_readonly_section_1 (enum section_category
);
119 #ifdef BSS_SECTION_ASM_OP
120 #ifdef ASM_OUTPUT_ALIGNED_BSS
121 static void asm_output_aligned_bss (FILE *, tree
, const char *,
122 unsigned HOST_WIDE_INT
, int)
125 #endif /* BSS_SECTION_ASM_OP */
126 static void mark_weak (tree
);
127 static void output_constant_pool (const char *, tree
);
128 static void handle_vtv_comdat_section (section
*, const_tree
);
130 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
131 section
*text_section
;
132 section
*data_section
;
133 section
*readonly_data_section
;
134 section
*sdata_section
;
135 section
*ctors_section
;
136 section
*dtors_section
;
137 section
*bss_section
;
138 section
*sbss_section
;
140 /* Various forms of common section. All are guaranteed to be nonnull. */
141 section
*tls_comm_section
;
142 section
*comm_section
;
143 section
*lcomm_section
;
145 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
147 section
*bss_noswitch_section
;
149 /* The section that holds the main exception table, when known. The section
150 is set either by the target's init_sections hook or by the first call to
151 switch_to_exception_section. */
152 section
*exception_section
;
154 /* The section that holds the DWARF2 frame unwind information, when known.
155 The section is set either by the target's init_sections hook or by the
156 first call to switch_to_eh_frame_section. */
157 section
*eh_frame_section
;
159 /* asm_out_file's current section. This is NULL if no section has yet
160 been selected or if we lose track of what the current section is. */
163 /* True if code for the current function is currently being directed
164 at the cold section. */
165 bool in_cold_section_p
;
167 /* The following global holds the "function name" for the code in the
168 cold section of a function, if hot/cold function splitting is enabled
169 and there was actually code that went into the cold section. A
170 pseudo function name is needed for the cold section of code for some
171 debugging tools that perform symbolization. */
172 tree cold_function_name
= NULL_TREE
;
174 /* A linked list of all the unnamed sections. */
175 static GTY(()) section
*unnamed_sections
;
177 /* Return a nonzero value if DECL has a section attribute. */
178 #define IN_NAMED_SECTION(DECL) \
179 (VAR_OR_FUNCTION_DECL_P (DECL) && DECL_SECTION_NAME (DECL) != NULL)
181 struct section_hasher
: ggc_ptr_hash
<section
>
183 typedef const char *compare_type
;
185 static hashval_t
hash (section
*);
186 static bool equal (section
*, const char *);
189 /* Hash table of named sections. */
190 static GTY(()) hash_table
<section_hasher
> *section_htab
;
192 struct object_block_hasher
: ggc_ptr_hash
<object_block
>
194 typedef const section
*compare_type
;
196 static hashval_t
hash (object_block
*);
197 static bool equal (object_block
*, const section
*);
200 /* A table of object_blocks, indexed by section. */
201 static GTY(()) hash_table
<object_block_hasher
> *object_block_htab
;
203 /* The next number to use for internal anchor labels. */
204 static GTY(()) int anchor_labelno
;
206 /* A pool of constants that can be shared between functions. */
207 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
209 /* Helper routines for maintaining section_htab. */
212 section_hasher::equal (section
*old
, const char *new_name
)
214 return strcmp (old
->named
.name
, new_name
) == 0;
218 section_hasher::hash (section
*old
)
220 return htab_hash_string (old
->named
.name
);
223 /* Return a hash value for section SECT. */
226 hash_section (section
*sect
)
228 if (sect
->common
.flags
& SECTION_NAMED
)
229 return htab_hash_string (sect
->named
.name
);
230 return sect
->common
.flags
& ~SECTION_DECLARED
;
233 /* Helper routines for maintaining object_block_htab. */
236 object_block_hasher::equal (object_block
*old
, const section
*new_section
)
238 return old
->sect
== new_section
;
242 object_block_hasher::hash (object_block
*old
)
244 return hash_section (old
->sect
);
247 /* Return a new unnamed section with the given fields. */
250 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
255 sect
= ggc_alloc
<section
> ();
256 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
257 sect
->unnamed
.callback
= callback
;
258 sect
->unnamed
.data
= data
;
259 sect
->unnamed
.next
= unnamed_sections
;
261 unnamed_sections
= sect
;
265 /* Return a SECTION_NOSWITCH section with the given fields. */
268 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
272 sect
= ggc_alloc
<section
> ();
273 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
274 sect
->noswitch
.callback
= callback
;
279 /* Return the named section structure associated with NAME. Create
280 a new section with the given fields if no such structure exists.
281 When NOT_EXISTING, then fail if the section already exists. */
284 get_section (const char *name
, unsigned int flags
, tree decl
,
287 section
*sect
, **slot
;
289 slot
= section_htab
->find_slot_with_hash (name
, htab_hash_string (name
),
291 flags
|= SECTION_NAMED
;
294 sect
= ggc_alloc
<section
> ();
295 sect
->named
.common
.flags
= flags
;
296 sect
->named
.name
= ggc_strdup (name
);
297 sect
->named
.decl
= decl
;
303 internal_error ("Section already exists: %qs", name
);
306 /* It is fine if one of the sections has SECTION_NOTYPE as long as
307 the other has none of the contrary flags (see the logic at the end
308 of default_section_type_flags, below). */
309 if (((sect
->common
.flags
^ flags
) & SECTION_NOTYPE
)
310 && !((sect
->common
.flags
| flags
)
311 & (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
| SECTION_ENTSIZE
312 | (HAVE_COMDAT_GROUP
? SECTION_LINKONCE
: 0))))
314 sect
->common
.flags
|= SECTION_NOTYPE
;
315 flags
|= SECTION_NOTYPE
;
317 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
318 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
320 /* It is fine if one of the section flags is
321 SECTION_WRITE | SECTION_RELRO and the other has none of these
322 flags (i.e. read-only) in named sections and either the
323 section hasn't been declared yet or has been declared as writable.
324 In that case just make sure the resulting flags are
325 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
327 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
328 == (SECTION_WRITE
| SECTION_RELRO
)
329 && (sect
->common
.flags
330 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
331 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
332 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
333 || (sect
->common
.flags
& SECTION_WRITE
)))
335 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
338 /* Sanity check user variables for flag changes. */
339 if (sect
->named
.decl
!= NULL
340 && DECL_P (sect
->named
.decl
)
341 && decl
!= sect
->named
.decl
)
343 if (decl
!= NULL
&& DECL_P (decl
))
344 error ("%+qD causes a section type conflict with %qD",
345 decl
, sect
->named
.decl
);
347 error ("section type conflict with %qD", sect
->named
.decl
);
348 inform (DECL_SOURCE_LOCATION (sect
->named
.decl
),
349 "%qD was declared here", sect
->named
.decl
);
351 else if (decl
!= NULL
&& DECL_P (decl
))
352 error ("%+qD causes a section type conflict", decl
);
354 error ("section type conflict");
355 /* Make sure we don't error about one section multiple times. */
356 sect
->common
.flags
|= SECTION_OVERRIDE
;
362 /* Return true if the current compilation mode benefits from having
363 objects grouped into blocks. */
366 use_object_blocks_p (void)
368 return flag_section_anchors
;
371 /* Return the object_block structure for section SECT. Create a new
372 structure if we haven't created one already. Return null if SECT
373 itself is null. Return also null for mergeable sections since
374 section anchors can't be used in mergeable sections anyway,
375 because the linker might move objects around, and using the
376 object blocks infrastructure in that case is both a waste and a
377 maintenance burden. */
379 static struct object_block
*
380 get_block_for_section (section
*sect
)
382 struct object_block
*block
;
387 if (sect
->common
.flags
& SECTION_MERGE
)
391 = object_block_htab
->find_slot_with_hash (sect
, hash_section (sect
),
396 block
= ggc_cleared_alloc
<object_block
> ();
403 /* Create a symbol with label LABEL and place it at byte offset
404 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
405 is not yet known. LABEL must be a garbage-collected string. */
408 create_block_symbol (const char *label
, struct object_block
*block
,
409 HOST_WIDE_INT offset
)
414 /* Create the extended SYMBOL_REF. */
415 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
416 symbol
= (rtx
) ggc_internal_alloc (size
);
418 /* Initialize the normal SYMBOL_REF fields. */
419 memset (symbol
, 0, size
);
420 PUT_CODE (symbol
, SYMBOL_REF
);
421 PUT_MODE (symbol
, Pmode
);
422 XSTR (symbol
, 0) = label
;
423 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
425 /* Initialize the block_symbol stuff. */
426 SYMBOL_REF_BLOCK (symbol
) = block
;
427 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
432 /* Return a section with a particular name and with whatever SECTION_*
433 flags section_type_flags deems appropriate. The name of the section
434 is taken from NAME if nonnull, otherwise it is taken from DECL's
435 DECL_SECTION_NAME. DECL is the decl associated with the section
436 (see the section comment for details) and RELOC is as for
437 section_type_flags. */
440 get_named_section (tree decl
, const char *name
, int reloc
)
446 gcc_assert (decl
&& DECL_P (decl
) && DECL_SECTION_NAME (decl
));
447 name
= DECL_SECTION_NAME (decl
);
450 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
451 return get_section (name
, flags
, decl
);
454 /* Worker for resolve_unique_section. */
457 set_implicit_section (struct symtab_node
*n
, void *data ATTRIBUTE_UNUSED
)
459 n
->implicit_section
= true;
463 /* If required, set DECL_SECTION_NAME to a unique name. */
466 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
467 int flag_function_or_data_sections
)
469 if (DECL_SECTION_NAME (decl
) == NULL
470 && targetm_common
.have_named_sections
471 && (flag_function_or_data_sections
472 || DECL_COMDAT_GROUP (decl
)))
474 targetm
.asm_out
.unique_section (decl
, reloc
);
475 if (DECL_SECTION_NAME (decl
))
476 symtab_node::get (decl
)->call_for_symbol_and_aliases
477 (set_implicit_section
, NULL
, true);
481 #ifdef BSS_SECTION_ASM_OP
483 #ifdef ASM_OUTPUT_ALIGNED_BSS
485 /* Utility function for targets to use in implementing
486 ASM_OUTPUT_ALIGNED_BSS.
487 ??? It is believed that this function will work in most cases so such
488 support is localized here. */
491 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
492 const char *name
, unsigned HOST_WIDE_INT size
,
495 switch_to_section (bss_section
);
496 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
497 #ifdef ASM_DECLARE_OBJECT_NAME
498 last_assemble_variable_decl
= decl
;
499 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
501 /* Standard thing is just output label for the object. */
502 ASM_OUTPUT_LABEL (file
, name
);
503 #endif /* ASM_DECLARE_OBJECT_NAME */
504 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
509 #endif /* BSS_SECTION_ASM_OP */
511 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
512 /* Return the hot section for function DECL. Return text_section for
516 hot_function_section (tree decl
)
518 if (decl
!= NULL_TREE
519 && DECL_SECTION_NAME (decl
) != NULL
520 && targetm_common
.have_named_sections
)
521 return get_named_section (decl
, NULL
, 0);
527 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
530 When DECL_SECTION_NAME is non-NULL and it is implicit section and
531 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
532 concatenate the name with NAMED_SECTION_SUFFIX.
533 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
536 get_named_text_section (tree decl
,
537 const char *text_section_name
,
538 const char *named_section_suffix
)
540 if (decl
&& DECL_SECTION_NAME (decl
))
542 if (named_section_suffix
)
544 const char *dsn
= DECL_SECTION_NAME (decl
);
545 const char *stripped_name
;
548 name
= (char *) alloca (strlen (dsn
) + 1);
552 stripped_name
= targetm
.strip_name_encoding (name
);
554 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
555 return get_named_section (decl
, buffer
, 0);
557 else if (symtab_node::get (decl
)->implicit_section
)
561 /* Do not try to split gnu_linkonce functions. This gets somewhat
563 if (DECL_COMDAT_GROUP (decl
) && !HAVE_COMDAT_GROUP
)
565 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
566 name
= targetm
.strip_name_encoding (name
);
567 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
573 return get_named_section (decl
, text_section_name
, 0);
576 /* Choose named function section based on its frequency. */
579 default_function_section (tree decl
, enum node_frequency freq
,
580 bool startup
, bool exit
)
582 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
583 /* Old GNU linkers have buggy --gc-section support, which sometimes
584 results in .gcc_except_table* sections being garbage collected. */
586 && symtab_node::get (decl
)->implicit_section
)
590 if (!flag_reorder_functions
591 || !targetm_common
.have_named_sections
)
593 /* Startup code should go to startup subsection unless it is
594 unlikely executed (this happens especially with function splitting
595 where we can split away unnecessary parts of static constructors. */
596 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
598 /* During LTO the tp_first_run profiling will naturally place all
599 initialization code first. Using separate section is counter-productive
600 because startup only code may call functions which are no longer
603 || !cgraph_node::get (decl
)->tp_first_run
604 || !opt_for_fn (decl
, flag_profile_reorder_functions
))
605 return get_named_text_section (decl
, ".text.startup", NULL
);
610 /* Similarly for exit. */
611 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
612 return get_named_text_section (decl
, ".text.exit", NULL
);
614 /* Group cold functions together, similarly for hot code. */
617 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
618 return get_named_text_section (decl
, ".text.unlikely", NULL
);
619 case NODE_FREQUENCY_HOT
:
620 return get_named_text_section (decl
, ".text.hot", NULL
);
627 /* Return the section for function DECL.
629 If DECL is NULL_TREE, return the text section. We can be passed
630 NULL_TREE under some circumstances by dbxout.c at least.
632 If FORCE_COLD is true, return cold function section ignoring
633 the frequency info of cgraph_node. */
636 function_section_1 (tree decl
, bool force_cold
)
638 section
*section
= NULL
;
639 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
640 bool startup
= false, exit
= false;
644 struct cgraph_node
*node
= cgraph_node::get (decl
);
648 freq
= node
->frequency
;
649 startup
= node
->only_called_at_startup
;
650 exit
= node
->only_called_at_exit
;
654 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
656 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
657 if (decl
!= NULL_TREE
658 && DECL_SECTION_NAME (decl
) != NULL
)
660 if (targetm
.asm_out
.function_section
)
661 section
= targetm
.asm_out
.function_section (decl
, freq
,
665 return get_named_section (decl
, NULL
, 0);
668 return targetm
.asm_out
.select_section
669 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
670 symtab_node::get (decl
)->definition_alignment ());
672 if (targetm
.asm_out
.function_section
)
673 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
676 return hot_function_section (decl
);
680 /* Return the section for function DECL.
682 If DECL is NULL_TREE, return the text section. We can be passed
683 NULL_TREE under some circumstances by dbxout.c at least. */
686 function_section (tree decl
)
688 /* Handle cases where function splitting code decides
689 to put function entry point into unlikely executed section
690 despite the fact that the function itself is not cold
691 (i.e. it is called rarely but contains a hot loop that is
692 better to live in hot subsection for the code locality). */
693 return function_section_1 (decl
,
694 first_function_block_is_cold
);
697 /* Return the section for the current function, take IN_COLD_SECTION_P
701 current_function_section (void)
703 return function_section_1 (current_function_decl
, in_cold_section_p
);
706 /* Tell assembler to switch to unlikely-to-be-executed text section. */
709 unlikely_text_section (void)
711 return function_section_1 (current_function_decl
, true);
714 /* When called within a function context, return true if the function
715 has been assigned a cold text section and if SECT is that section.
716 When called outside a function context, return true if SECT is the
717 default cold section. */
720 unlikely_text_section_p (section
*sect
)
722 return sect
== function_section_1 (current_function_decl
, true);
725 /* Switch to the other function partition (if inside of hot section
726 into cold section, otherwise into the hot section). */
729 switch_to_other_text_partition (void)
731 in_cold_section_p
= !in_cold_section_p
;
732 switch_to_section (current_function_section ());
735 /* Return the read-only data section associated with function DECL. */
738 default_function_rodata_section (tree decl
)
740 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
742 const char *name
= DECL_SECTION_NAME (decl
);
744 if (DECL_COMDAT_GROUP (decl
) && HAVE_COMDAT_GROUP
)
750 dot
= strchr (name
+ 1, '.');
753 len
= strlen (dot
) + 8;
754 rname
= (char *) alloca (len
);
756 strcpy (rname
, ".rodata");
758 return get_section (rname
, SECTION_LINKONCE
, decl
);
760 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
761 else if (DECL_COMDAT_GROUP (decl
)
762 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
764 size_t len
= strlen (name
) + 1;
765 char *rname
= (char *) alloca (len
);
767 memcpy (rname
, name
, len
);
769 return get_section (rname
, SECTION_LINKONCE
, decl
);
771 /* For .text.foo we want to use .rodata.foo. */
772 else if (flag_function_sections
&& flag_data_sections
773 && strncmp (name
, ".text.", 6) == 0)
775 size_t len
= strlen (name
) + 1;
776 char *rname
= (char *) alloca (len
+ 2);
778 memcpy (rname
, ".rodata", 7);
779 memcpy (rname
+ 7, name
+ 5, len
- 5);
780 return get_section (rname
, 0, decl
);
784 return readonly_data_section
;
787 /* Return the read-only data section associated with function DECL
788 for targets where that section should be always the single
789 readonly data section. */
792 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
794 return readonly_data_section
;
797 /* A subroutine of mergeable_string_section and mergeable_constant_section. */
800 function_mergeable_rodata_prefix (void)
802 section
*s
= targetm
.asm_out
.function_rodata_section (current_function_decl
);
803 if (SECTION_STYLE (s
) == SECTION_NAMED
)
804 return s
->named
.name
;
806 return targetm
.asm_out
.mergeable_rodata_prefix
;
809 /* Return the section to use for string merging. */
812 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
813 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
814 unsigned int flags ATTRIBUTE_UNUSED
)
818 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
819 && TREE_CODE (decl
) == STRING_CST
820 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
822 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
823 && TREE_STRING_LENGTH (decl
) == len
)
825 scalar_int_mode mode
;
826 unsigned int modesize
;
830 const char *prefix
= function_mergeable_rodata_prefix ();
831 char *name
= (char *) alloca (strlen (prefix
) + 30);
833 mode
= SCALAR_INT_TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
834 modesize
= GET_MODE_BITSIZE (mode
);
835 if (modesize
>= 8 && modesize
<= 256
836 && (modesize
& (modesize
- 1)) == 0)
838 if (align
< modesize
)
841 if (!HAVE_LD_ALIGNED_SHF_MERGE
&& align
> 8)
842 return readonly_data_section
;
844 str
= TREE_STRING_POINTER (decl
);
845 unit
= GET_MODE_SIZE (mode
);
847 /* Check for embedded NUL characters. */
848 for (i
= 0; i
< len
; i
+= unit
)
850 for (j
= 0; j
< unit
; j
++)
851 if (str
[i
+ j
] != '\0')
856 if (i
== len
- unit
|| (unit
== 1 && i
== len
))
858 sprintf (name
, "%s.str%d.%d", prefix
,
859 modesize
/ 8, (int) (align
/ 8));
860 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
861 return get_section (name
, flags
, NULL
);
866 return readonly_data_section
;
869 /* Return the section to use for constant merging. */
872 mergeable_constant_section (machine_mode mode ATTRIBUTE_UNUSED
,
873 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
874 unsigned int flags ATTRIBUTE_UNUSED
)
876 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
879 && known_le (GET_MODE_BITSIZE (mode
), align
)
882 && (align
& (align
- 1)) == 0
883 && (HAVE_LD_ALIGNED_SHF_MERGE
? 1 : align
== 8))
885 const char *prefix
= function_mergeable_rodata_prefix ();
886 char *name
= (char *) alloca (strlen (prefix
) + 30);
888 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
889 flags
|= (align
/ 8) | SECTION_MERGE
;
890 return get_section (name
, flags
, NULL
);
892 return readonly_data_section
;
895 /* Given NAME, a putative register name, discard any customary prefixes. */
898 strip_reg_name (const char *name
)
900 #ifdef REGISTER_PREFIX
901 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
902 name
+= strlen (REGISTER_PREFIX
);
904 if (name
[0] == '%' || name
[0] == '#')
909 /* The user has asked for a DECL to have a particular name. Set (or
910 change) it in such a way that we don't prefix an underscore to
913 set_user_assembler_name (tree decl
, const char *name
)
915 char *starred
= (char *) alloca (strlen (name
) + 2);
917 strcpy (starred
+ 1, name
);
918 symtab
->change_decl_assembler_name (decl
, get_identifier (starred
));
919 SET_DECL_RTL (decl
, NULL_RTX
);
922 /* Decode an `asm' spec for a declaration as a register name.
923 Return the register number, or -1 if nothing specified,
924 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
925 or -3 if ASMSPEC is `cc' and is not recognized,
926 or -4 if ASMSPEC is `memory' and is not recognized.
927 Accept an exact spelling or a decimal number.
928 Prefixes such as % are optional. */
931 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
933 /* Presume just one register is clobbered. */
940 /* Get rid of confusing prefixes. */
941 asmspec
= strip_reg_name (asmspec
);
943 /* Allow a decimal number as a "register name". */
944 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
945 if (! ISDIGIT (asmspec
[i
]))
947 if (asmspec
[0] != 0 && i
< 0)
950 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0 && reg_names
[i
][0])
956 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
958 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
961 #ifdef OVERLAPPING_REGISTER_NAMES
965 const char *const name
;
968 } table
[] = OVERLAPPING_REGISTER_NAMES
;
970 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
972 && ! strcmp (asmspec
, table
[i
].name
))
974 *pnregs
= table
[i
].nregs
;
975 return table
[i
].number
;
978 #endif /* OVERLAPPING_REGISTER_NAMES */
980 #ifdef ADDITIONAL_REGISTER_NAMES
982 static const struct { const char *const name
; const int number
; } table
[]
983 = ADDITIONAL_REGISTER_NAMES
;
985 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
987 && ! strcmp (asmspec
, table
[i
].name
)
988 && reg_names
[table
[i
].number
][0])
989 return table
[i
].number
;
991 #endif /* ADDITIONAL_REGISTER_NAMES */
993 if (!strcmp (asmspec
, "memory"))
996 if (!strcmp (asmspec
, "cc"))
1006 decode_reg_name (const char *name
)
1009 return decode_reg_name_and_count (name
, &count
);
1013 /* Return true if DECL's initializer is suitable for a BSS section. */
1016 bss_initializer_p (const_tree decl
, bool named
)
1018 /* Do not put non-common constants into the .bss section, they belong in
1019 a readonly section, except when NAMED is true. */
1020 return ((!TREE_READONLY (decl
) || DECL_COMMON (decl
) || named
)
1021 && (DECL_INITIAL (decl
) == NULL
1022 /* In LTO we have no errors in program; error_mark_node is used
1023 to mark offlined constructors. */
1024 || (DECL_INITIAL (decl
) == error_mark_node
1026 || (flag_zero_initialized_in_bss
1027 && initializer_zerop (DECL_INITIAL (decl
)))));
1030 /* Compute the alignment of variable specified by DECL.
1031 DONT_OUTPUT_DATA is from assemble_variable. */
1034 align_variable (tree decl
, bool dont_output_data
)
1036 unsigned int align
= DECL_ALIGN (decl
);
1038 /* In the case for initialing an array whose length isn't specified,
1039 where we have not yet been able to do the layout,
1040 figure out the proper alignment now. */
1041 if (dont_output_data
&& DECL_SIZE (decl
) == 0
1042 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
1043 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
1045 /* Some object file formats have a maximum alignment which they support.
1046 In particular, a.out format supports a maximum alignment of 4. */
1047 if (align
> MAX_OFILE_ALIGNMENT
)
1049 error ("alignment of %q+D is greater than maximum object "
1050 "file alignment %d", decl
,
1051 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
1052 align
= MAX_OFILE_ALIGNMENT
;
1055 if (! DECL_USER_ALIGN (decl
))
1057 #ifdef DATA_ABI_ALIGNMENT
1058 unsigned int data_abi_align
1059 = DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1060 /* For backwards compatibility, don't assume the ABI alignment for
1062 if (! DECL_THREAD_LOCAL_P (decl
) || data_abi_align
<= BITS_PER_WORD
)
1063 align
= data_abi_align
;
1066 /* On some machines, it is good to increase alignment sometimes.
1067 But as DECL_ALIGN is used both for actually emitting the variable
1068 and for code accessing the variable as guaranteed alignment, we
1069 can only increase the alignment if it is a performance optimization
1070 if the references to it must bind to the current definition. */
1071 if (decl_binds_to_current_def_p (decl
)
1072 && !DECL_VIRTUAL_P (decl
))
1074 #ifdef DATA_ALIGNMENT
1075 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1076 /* Don't increase alignment too much for TLS variables - TLS space
1078 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1081 if (DECL_INITIAL (decl
) != 0
1082 /* In LTO we have no errors in program; error_mark_node is used
1083 to mark offlined constructors. */
1084 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1086 unsigned int const_align
1087 = targetm
.constant_alignment (DECL_INITIAL (decl
), align
);
1088 /* Don't increase alignment too much for TLS variables - TLS
1089 space is too precious. */
1090 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1091 align
= const_align
;
1096 /* Reset the alignment in case we have made it tighter, so we can benefit
1097 from it in get_pointer_alignment. */
1098 SET_DECL_ALIGN (decl
, align
);
1101 /* Return DECL_ALIGN (decl), possibly increased for optimization purposes
1102 beyond what align_variable returned. */
1105 get_variable_align (tree decl
)
1107 unsigned int align
= DECL_ALIGN (decl
);
1109 /* For user aligned vars or static vars align_variable already did
1111 if (DECL_USER_ALIGN (decl
) || !TREE_PUBLIC (decl
))
1114 #ifdef DATA_ABI_ALIGNMENT
1115 if (DECL_THREAD_LOCAL_P (decl
))
1116 align
= DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1119 /* For decls that bind to the current definition, align_variable
1120 did also everything, except for not assuming ABI required alignment
1121 of TLS variables. For other vars, increase the alignment here
1122 as an optimization. */
1123 if (!decl_binds_to_current_def_p (decl
))
1125 /* On some machines, it is good to increase alignment sometimes. */
1126 #ifdef DATA_ALIGNMENT
1127 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1128 /* Don't increase alignment too much for TLS variables - TLS space
1130 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1133 if (DECL_INITIAL (decl
) != 0
1134 /* In LTO we have no errors in program; error_mark_node is used
1135 to mark offlined constructors. */
1136 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1138 unsigned int const_align
1139 = targetm
.constant_alignment (DECL_INITIAL (decl
), align
);
1140 /* Don't increase alignment too much for TLS variables - TLS space
1142 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1143 align
= const_align
;
1150 /* Return the section into which the given VAR_DECL or CONST_DECL
1151 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1152 section should be used wherever possible. */
1155 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1157 addr_space_t as
= ADDR_SPACE_GENERIC
;
1159 varpool_node
*vnode
= varpool_node::get (decl
);
1162 vnode
= vnode
->ultimate_alias_target ();
1166 if (TREE_TYPE (decl
) != error_mark_node
)
1167 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1169 /* We need the constructor to figure out reloc flag. */
1171 vnode
->get_constructor ();
1173 if (DECL_COMMON (decl
))
1175 /* If the decl has been given an explicit section name, or it resides
1176 in a non-generic address space, then it isn't common, and shouldn't
1177 be handled as such. */
1178 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1179 && ADDR_SPACE_GENERIC_P (as
));
1180 if (DECL_THREAD_LOCAL_P (decl
))
1181 return tls_comm_section
;
1182 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1183 return comm_section
;
1186 if (DECL_INITIAL (decl
) == error_mark_node
)
1187 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1188 else if (DECL_INITIAL (decl
))
1189 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1193 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1194 if (IN_NAMED_SECTION (decl
))
1196 section
*sect
= get_named_section (decl
, NULL
, reloc
);
1198 if ((sect
->common
.flags
& SECTION_BSS
)
1199 && !bss_initializer_p (decl
, true))
1201 error_at (DECL_SOURCE_LOCATION (decl
),
1202 "only zero initializers are allowed in section %qs",
1204 DECL_INITIAL (decl
) = error_mark_node
;
1209 if (ADDR_SPACE_GENERIC_P (as
)
1210 && !DECL_THREAD_LOCAL_P (decl
)
1211 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1212 && bss_initializer_p (decl
))
1214 if (!TREE_PUBLIC (decl
)
1215 && !((flag_sanitize
& SANITIZE_ADDRESS
)
1216 && asan_protect_global (decl
)))
1217 return lcomm_section
;
1218 if (bss_noswitch_section
)
1219 return bss_noswitch_section
;
1222 return targetm
.asm_out
.select_section (decl
, reloc
,
1223 get_variable_align (decl
));
1226 /* Return the block into which object_block DECL should be placed. */
1228 static struct object_block
*
1229 get_block_for_decl (tree decl
)
1235 /* The object must be defined in this translation unit. */
1236 if (DECL_EXTERNAL (decl
))
1239 /* There's no point using object blocks for something that is
1240 isolated by definition. */
1241 if (DECL_COMDAT_GROUP (decl
))
1245 /* We can only calculate block offsets if the decl has a known
1247 if (DECL_SIZE_UNIT (decl
) == NULL
)
1249 if (!tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
)))
1252 /* Find out which section should contain DECL. We cannot put it into
1253 an object block if it requires a standalone definition. */
1255 align_variable (decl
, 0);
1256 sect
= get_variable_section (decl
, true);
1257 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1260 return get_block_for_section (sect
);
1263 /* Make sure block symbol SYMBOL is in block BLOCK. */
1266 change_symbol_block (rtx symbol
, struct object_block
*block
)
1268 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1270 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1271 SYMBOL_REF_BLOCK (symbol
) = block
;
1275 /* Return true if it is possible to put DECL in an object_block. */
1278 use_blocks_for_decl_p (tree decl
)
1280 struct symtab_node
*snode
;
1282 /* Only data DECLs can be placed into object blocks. */
1283 if (!VAR_P (decl
) && TREE_CODE (decl
) != CONST_DECL
)
1286 /* DECL_INITIAL (decl) set to decl is a hack used for some decls that
1287 are never used from code directly and we never want object block handling
1289 if (DECL_INITIAL (decl
) == decl
)
1292 /* If this decl is an alias, then we don't want to emit a
1295 && (snode
= symtab_node::get (decl
)) != NULL
1299 return targetm
.use_blocks_for_decl_p (decl
);
1302 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
1303 until we find an identifier that is not itself a transparent alias.
1304 Modify the alias passed to it by reference (and all aliases on the
1305 way to the ultimate target), such that they do not have to be
1306 followed again, and return the ultimate target of the alias
1310 ultimate_transparent_alias_target (tree
*alias
)
1312 tree target
= *alias
;
1314 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
1316 gcc_assert (TREE_CHAIN (target
));
1317 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
1318 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
1319 && ! TREE_CHAIN (target
));
1326 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1327 have static storage duration. In other words, it should not be an
1328 automatic variable, including PARM_DECLs.
1330 There is, however, one exception: this function handles variables
1331 explicitly placed in a particular register by the user.
1333 This is never called for PARM_DECL nodes. */
1336 make_decl_rtl (tree decl
)
1338 const char *name
= 0;
1343 /* Check that we are not being given an automatic variable. */
1344 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1345 && TREE_CODE (decl
) != RESULT_DECL
);
1347 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1348 gcc_assert (!VAR_P (decl
)
1349 || TREE_STATIC (decl
)
1350 || TREE_PUBLIC (decl
)
1351 || DECL_EXTERNAL (decl
)
1352 || DECL_REGISTER (decl
));
1354 /* And that we were not given a type or a label. */
1355 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1356 && TREE_CODE (decl
) != LABEL_DECL
);
1358 /* For a duplicate declaration, we can be called twice on the
1359 same DECL node. Don't discard the RTL already made. */
1360 if (DECL_RTL_SET_P (decl
))
1362 /* If the old RTL had the wrong mode, fix the mode. */
1363 x
= DECL_RTL (decl
);
1364 if (GET_MODE (x
) != DECL_MODE (decl
))
1365 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1367 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1370 /* ??? Another way to do this would be to maintain a hashed
1371 table of such critters. Instead of adding stuff to a DECL
1372 to give certain attributes to it, we could use an external
1373 hash map from DECL to set of attributes. */
1375 /* Let the target reassign the RTL if it wants.
1376 This is necessary, for example, when one machine specific
1377 decl attribute overrides another. */
1378 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1380 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1381 on the new decl information. */
1383 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1384 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1385 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1390 /* If this variable belongs to the global constant pool, retrieve the
1391 pre-computed RTL or recompute it in LTO mode. */
1392 if (VAR_P (decl
) && DECL_IN_CONSTANT_POOL (decl
))
1394 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1398 id
= DECL_ASSEMBLER_NAME (decl
);
1399 name
= IDENTIFIER_POINTER (id
);
1401 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1402 && DECL_REGISTER (decl
))
1404 error ("register name not specified for %q+D", decl
);
1406 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1408 const char *asmspec
= name
+1;
1409 machine_mode mode
= DECL_MODE (decl
);
1410 reg_number
= decode_reg_name (asmspec
);
1411 /* First detect errors in declaring global registers. */
1412 if (reg_number
== -1)
1413 error ("register name not specified for %q+D", decl
);
1414 else if (reg_number
< 0)
1415 error ("invalid register name for %q+D", decl
);
1416 else if (mode
== BLKmode
)
1417 error ("data type of %q+D isn%'t suitable for a register",
1419 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1420 error ("the register specified for %q+D cannot be accessed"
1421 " by the current target", decl
);
1422 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1423 error ("the register specified for %q+D is not general enough"
1424 " to be used as a register variable", decl
);
1425 else if (!targetm
.hard_regno_mode_ok (reg_number
, mode
))
1426 error ("register specified for %q+D isn%'t suitable for data type",
1428 /* Now handle properly declared static register variables. */
1433 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1435 DECL_INITIAL (decl
) = 0;
1436 error ("global register variable has initial value");
1438 if (TREE_THIS_VOLATILE (decl
))
1439 warning (OPT_Wvolatile_register_var
,
1440 "optimization may eliminate reads and/or "
1441 "writes to register variables");
1443 /* If the user specified one of the eliminables registers here,
1444 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1445 confused with that register and be eliminated. This usage is
1446 somewhat suspect... */
1448 SET_DECL_RTL (decl
, gen_raw_REG (mode
, reg_number
));
1449 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1450 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1452 if (TREE_STATIC (decl
))
1454 /* Make this register global, so not usable for anything
1456 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1457 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1458 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1460 nregs
= hard_regno_nregs (reg_number
, mode
);
1462 globalize_reg (decl
, reg_number
+ --nregs
);
1465 /* As a register variable, it has no section. */
1468 /* Avoid internal errors from invalid register
1470 SET_DECL_ASSEMBLER_NAME (decl
, NULL_TREE
);
1471 DECL_HARD_REGISTER (decl
) = 0;
1472 /* Also avoid SSA inconsistencies by pretending this is an external
1474 DECL_EXTERNAL (decl
) = 1;
1477 /* Now handle ordinary static variables and functions (in memory).
1478 Also handle vars declared register invalidly. */
1479 else if (name
[0] == '*')
1481 #ifdef REGISTER_PREFIX
1482 if (strlen (REGISTER_PREFIX
) != 0)
1484 reg_number
= decode_reg_name (name
);
1485 if (reg_number
>= 0 || reg_number
== -3)
1486 error ("register name given for non-register variable %q+D", decl
);
1491 /* Specifying a section attribute on a variable forces it into a
1492 non-.bss section, and thus it cannot be common. */
1493 /* FIXME: In general this code should not be necessary because
1494 visibility pass is doing the same work. But notice_global_symbol
1495 is called early and it needs to make DECL_RTL to get the name.
1496 we take care of recomputing the DECL_RTL after visibility is changed. */
1498 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
))
1499 && DECL_SECTION_NAME (decl
) != NULL
1500 && DECL_INITIAL (decl
) == NULL_TREE
1501 && DECL_COMMON (decl
))
1502 DECL_COMMON (decl
) = 0;
1504 /* Variables can't be both common and weak. */
1505 if (VAR_P (decl
) && DECL_WEAK (decl
))
1506 DECL_COMMON (decl
) = 0;
1508 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1509 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1512 machine_mode address_mode
= Pmode
;
1513 if (TREE_TYPE (decl
) != error_mark_node
)
1515 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1516 address_mode
= targetm
.addr_space
.address_mode (as
);
1518 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1520 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1521 SET_SYMBOL_REF_DECL (x
, decl
);
1523 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1524 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1525 set_mem_attributes (x
, decl
, 1);
1526 SET_DECL_RTL (decl
, x
);
1528 /* Optionally set flags or add text to the name to record information
1529 such as that it is a function name.
1530 If the name is changed, the macro ASM_OUTPUT_LABELREF
1531 will have to know how to strip this information. */
1532 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1535 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1536 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1540 make_decl_rtl_for_debug (tree decl
)
1542 unsigned int save_aliasing_flag
;
1545 if (DECL_RTL_SET_P (decl
))
1546 return DECL_RTL (decl
);
1548 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1549 call new_alias_set. If running with -fcompare-debug, sometimes
1550 we do not want to create alias sets that will throw the alias
1551 numbers off in the comparison dumps. So... clearing
1552 flag_strict_aliasing will keep new_alias_set() from creating a
1554 save_aliasing_flag
= flag_strict_aliasing
;
1555 flag_strict_aliasing
= 0;
1557 rtl
= DECL_RTL (decl
);
1558 /* Reset DECL_RTL back, as various parts of the compiler expects
1559 DECL_RTL set meaning it is actually going to be output. */
1560 SET_DECL_RTL (decl
, NULL
);
1562 flag_strict_aliasing
= save_aliasing_flag
;
1566 /* Output a string of literal assembler code
1567 for an `asm' keyword used between functions. */
1570 assemble_asm (tree string
)
1575 if (TREE_CODE (string
) == ADDR_EXPR
)
1576 string
= TREE_OPERAND (string
, 0);
1578 p
= TREE_STRING_POINTER (string
);
1579 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1582 /* Write the address of the entity given by SYMBOL to SEC. */
1584 assemble_addr_to_section (rtx symbol
, section
*sec
)
1586 switch_to_section (sec
);
1587 assemble_align (POINTER_SIZE
);
1588 assemble_integer (symbol
, POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
1591 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1592 not) section for PRIORITY. */
1594 get_cdtor_priority_section (int priority
, bool constructor_p
)
1596 /* Buffer conservatively large enough for the full range of a 32-bit
1597 int plus the text below. */
1600 /* ??? This only works reliably with the GNU linker. */
1601 sprintf (buf
, "%s.%.5u",
1602 constructor_p
? ".ctors" : ".dtors",
1603 /* Invert the numbering so the linker puts us in the proper
1604 order; constructors are run from right to left, and the
1605 linker sorts in increasing order. */
1606 MAX_INIT_PRIORITY
- priority
);
1607 return get_section (buf
, SECTION_WRITE
, NULL
);
1611 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1615 if (priority
!= DEFAULT_INIT_PRIORITY
)
1616 sec
= get_cdtor_priority_section (priority
,
1617 /*constructor_p=*/false);
1619 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1621 assemble_addr_to_section (symbol
, sec
);
1624 #ifdef DTORS_SECTION_ASM_OP
1626 default_dtor_section_asm_out_destructor (rtx symbol
,
1627 int priority ATTRIBUTE_UNUSED
)
1629 assemble_addr_to_section (symbol
, dtors_section
);
1634 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1638 if (priority
!= DEFAULT_INIT_PRIORITY
)
1639 sec
= get_cdtor_priority_section (priority
,
1640 /*constructor_p=*/true);
1642 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1644 assemble_addr_to_section (symbol
, sec
);
1647 #ifdef CTORS_SECTION_ASM_OP
1649 default_ctor_section_asm_out_constructor (rtx symbol
,
1650 int priority ATTRIBUTE_UNUSED
)
1652 assemble_addr_to_section (symbol
, ctors_section
);
1656 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1657 a nonzero value if the constant pool should be output before the
1658 start of the function, or a zero value if the pool should output
1659 after the end of the function. The default is to put it before the
1662 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1663 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1666 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1667 to be output to assembler.
1668 Set first_global_object_name and weak_global_object_name as appropriate. */
1671 notice_global_symbol (tree decl
)
1673 const char **t
= &first_global_object_name
;
1675 if (first_global_object_name
1676 || !TREE_PUBLIC (decl
)
1677 || DECL_EXTERNAL (decl
)
1678 || !DECL_NAME (decl
)
1679 || (VAR_P (decl
) && DECL_HARD_REGISTER (decl
))
1680 || (TREE_CODE (decl
) != FUNCTION_DECL
1682 || (DECL_COMMON (decl
)
1683 && (DECL_INITIAL (decl
) == 0
1684 || DECL_INITIAL (decl
) == error_mark_node
)))))
1687 /* We win when global object is found, but it is useful to know about weak
1688 symbol as well so we can produce nicer unique names. */
1689 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1690 t
= &weak_global_object_name
;
1694 tree id
= DECL_ASSEMBLER_NAME (decl
);
1695 ultimate_transparent_alias_target (&id
);
1696 *t
= ggc_strdup (targetm
.strip_name_encoding (IDENTIFIER_POINTER (id
)));
1700 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1701 current function goes into the cold section, so that targets can use
1702 current_function_section during RTL expansion. DECL describes the
1706 decide_function_section (tree decl
)
1708 first_function_block_is_cold
= false;
1710 if (DECL_SECTION_NAME (decl
))
1712 struct cgraph_node
*node
= cgraph_node::get (current_function_decl
);
1713 /* Calls to function_section rely on first_function_block_is_cold
1715 first_function_block_is_cold
= (node
1717 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1720 in_cold_section_p
= first_function_block_is_cold
;
1723 /* Get the function's name, as described by its RTL. This may be
1724 different from the DECL_NAME name used in the source file. */
1726 get_fnname_from_decl (tree decl
)
1728 rtx x
= DECL_RTL (decl
);
1729 gcc_assert (MEM_P (x
));
1731 gcc_assert (GET_CODE (x
) == SYMBOL_REF
);
1735 /* Output assembler code for the constant pool of a function and associated
1736 with defining the name of the function. DECL describes the function.
1737 NAME is the function's name. For the constant pool, we use the current
1738 constant pool data. */
1741 assemble_start_function (tree decl
, const char *fnname
)
1744 char tmp_label
[100];
1745 bool hot_label_written
= false;
1747 if (crtl
->has_bb_partition
)
1749 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1750 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1751 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1752 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1753 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1754 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1755 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1756 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1758 cold_function_name
= NULL_TREE
;
1762 crtl
->subsections
.hot_section_label
= NULL
;
1763 crtl
->subsections
.cold_section_label
= NULL
;
1764 crtl
->subsections
.hot_section_end_label
= NULL
;
1765 crtl
->subsections
.cold_section_end_label
= NULL
;
1768 /* The following code does not need preprocessing in the assembler. */
1772 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1773 output_constant_pool (fnname
, decl
);
1775 align
= symtab_node::get (decl
)->definition_alignment ();
1777 /* Make sure the not and cold text (code) sections are properly
1778 aligned. This is necessary here in the case where the function
1779 has both hot and cold sections, because we don't want to re-set
1780 the alignment when the section switch happens mid-function. */
1782 if (crtl
->has_bb_partition
)
1784 first_function_block_is_cold
= false;
1786 switch_to_section (unlikely_text_section ());
1787 assemble_align (align
);
1788 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1790 /* When the function starts with a cold section, we need to explicitly
1791 align the hot section and write out the hot section label.
1792 But if the current function is a thunk, we do not have a CFG. */
1794 && BB_PARTITION (ENTRY_BLOCK_PTR_FOR_FN (cfun
)->next_bb
) == BB_COLD_PARTITION
)
1796 switch_to_section (text_section
);
1797 assemble_align (align
);
1798 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1799 hot_label_written
= true;
1800 first_function_block_is_cold
= true;
1802 in_cold_section_p
= first_function_block_is_cold
;
1806 /* Switch to the correct text section for the start of the function. */
1808 switch_to_section (function_section (decl
));
1809 if (crtl
->has_bb_partition
&& !hot_label_written
)
1810 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1812 /* Tell assembler to move to target machine's alignment for functions. */
1813 align
= floor_log2 (align
/ BITS_PER_UNIT
);
1816 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1819 /* Handle a user-specified function alignment.
1820 Note that we still need to align to DECL_ALIGN, as above,
1821 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1822 if (! DECL_USER_ALIGN (decl
)
1823 && align_functions
.levels
[0].log
> align
1824 && optimize_function_for_speed_p (cfun
))
1826 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1827 int align_log
= align_functions
.levels
[0].log
;
1829 int max_skip
= align_functions
.levels
[0].maxskip
;
1830 if (flag_limit_function_alignment
&& crtl
->max_insn_address
> 0
1831 && max_skip
>= crtl
->max_insn_address
)
1832 max_skip
= crtl
->max_insn_address
- 1;
1834 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1835 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
, align_log
, max_skip
);
1836 if (max_skip
== align_functions
.levels
[0].maxskip
)
1837 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1838 align_functions
.levels
[1].log
,
1839 align_functions
.levels
[1].maxskip
);
1841 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions
.levels
[0].log
);
1845 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1846 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1849 if (!DECL_IGNORED_P (decl
))
1850 (*debug_hooks
->begin_function
) (decl
);
1852 /* Make function name accessible from other files, if appropriate. */
1854 if (TREE_PUBLIC (decl
))
1856 notice_global_symbol (decl
);
1858 globalize_decl (decl
);
1860 maybe_assemble_visibility (decl
);
1863 if (DECL_PRESERVE_P (decl
))
1864 targetm
.asm_out
.mark_decl_preserved (fnname
);
1866 unsigned short patch_area_size
= crtl
->patch_area_size
;
1867 unsigned short patch_area_entry
= crtl
->patch_area_entry
;
1869 /* Emit the patching area before the entry label, if any. */
1870 if (patch_area_entry
> 0)
1871 targetm
.asm_out
.print_patchable_function_entry (asm_out_file
,
1872 patch_area_entry
, true);
1874 /* Do any machine/system dependent processing of the function name. */
1875 #ifdef ASM_DECLARE_FUNCTION_NAME
1876 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1878 /* Standard thing is just output label for the function. */
1879 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1880 #endif /* ASM_DECLARE_FUNCTION_NAME */
1882 /* And the area after the label. Record it if we haven't done so yet. */
1883 if (patch_area_size
> patch_area_entry
)
1884 targetm
.asm_out
.print_patchable_function_entry (asm_out_file
,
1887 patch_area_entry
== 0);
1889 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1890 saw_no_split_stack
= true;
1893 /* Output assembler code associated with defining the size of the
1894 function. DECL describes the function. NAME is the function's name. */
1897 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1899 #ifdef ASM_DECLARE_FUNCTION_SIZE
1900 /* We could have switched section in the middle of the function. */
1901 if (crtl
->has_bb_partition
)
1902 switch_to_section (function_section (decl
));
1903 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1905 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1907 output_constant_pool (fnname
, decl
);
1908 switch_to_section (function_section (decl
)); /* need to switch back */
1910 /* Output labels for end of hot/cold text sections (to be used by
1912 if (crtl
->has_bb_partition
)
1914 section
*save_text_section
;
1916 save_text_section
= in_section
;
1917 switch_to_section (unlikely_text_section ());
1918 #ifdef ASM_DECLARE_COLD_FUNCTION_SIZE
1919 if (cold_function_name
!= NULL_TREE
)
1920 ASM_DECLARE_COLD_FUNCTION_SIZE (asm_out_file
,
1921 IDENTIFIER_POINTER (cold_function_name
),
1924 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1925 if (first_function_block_is_cold
)
1926 switch_to_section (text_section
);
1928 switch_to_section (function_section (decl
));
1929 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1930 switch_to_section (save_text_section
);
1934 /* Assemble code to leave SIZE bytes of zeros. */
1937 assemble_zeros (unsigned HOST_WIDE_INT size
)
1939 /* Do no output if -fsyntax-only. */
1940 if (flag_syntax_only
)
1943 #ifdef ASM_NO_SKIP_IN_TEXT
1944 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1945 so we must output 0s explicitly in the text section. */
1946 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1948 unsigned HOST_WIDE_INT i
;
1949 for (i
= 0; i
< size
; i
++)
1950 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1955 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1958 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1961 assemble_align (unsigned int align
)
1963 if (align
> BITS_PER_UNIT
)
1965 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1969 /* Assemble a string constant with the specified C string as contents. */
1972 assemble_string (const char *p
, int size
)
1977 /* If the string is very long, split it up. */
1981 int thissize
= size
- pos
;
1982 if (thissize
> maximum
)
1985 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1993 /* A noswitch_section_callback for lcomm_section. */
1996 emit_local (tree decl ATTRIBUTE_UNUSED
,
1997 const char *name ATTRIBUTE_UNUSED
,
1998 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1999 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2001 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
2002 unsigned int align
= symtab_node::get (decl
)->definition_alignment ();
2003 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
2006 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
2007 unsigned int align
= symtab_node::get (decl
)->definition_alignment ();
2008 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, align
);
2011 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2016 /* A noswitch_section_callback for bss_noswitch_section. */
2018 #if defined ASM_OUTPUT_ALIGNED_BSS
2020 emit_bss (tree decl ATTRIBUTE_UNUSED
,
2021 const char *name ATTRIBUTE_UNUSED
,
2022 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
2023 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2025 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
,
2026 get_variable_align (decl
));
2031 /* A noswitch_section_callback for comm_section. */
2034 emit_common (tree decl ATTRIBUTE_UNUSED
,
2035 const char *name ATTRIBUTE_UNUSED
,
2036 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
2037 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2039 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
2040 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
2041 size
, get_variable_align (decl
));
2043 #elif defined ASM_OUTPUT_ALIGNED_COMMON
2044 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
,
2045 get_variable_align (decl
));
2048 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
2053 /* A noswitch_section_callback for tls_comm_section. */
2056 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
2057 const char *name ATTRIBUTE_UNUSED
,
2058 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
2059 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2061 #ifdef ASM_OUTPUT_TLS_COMMON
2062 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
2065 sorry ("thread-local COMMON data not implemented");
2070 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
2071 NAME is the name of DECL's SYMBOL_REF. */
2074 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
,
2077 unsigned HOST_WIDE_INT size
, rounded
;
2079 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2082 if ((flag_sanitize
& SANITIZE_ADDRESS
) && asan_protect_global (decl
))
2083 size
+= asan_red_zone_size (size
);
2085 /* Don't allocate zero bytes of common,
2086 since that means "undefined external" in the linker. */
2090 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2091 so that each uninitialized object starts on such a boundary. */
2092 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
2093 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2094 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2096 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
2097 && (unsigned HOST_WIDE_INT
) (align
/ BITS_PER_UNIT
) > rounded
)
2098 error ("requested alignment for %q+D is greater than "
2099 "implemented alignment of %wu", decl
, rounded
);
2102 /* A subroutine of assemble_variable. Output the label and contents of
2103 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
2104 is as for assemble_variable. */
2107 assemble_variable_contents (tree decl
, const char *name
,
2108 bool dont_output_data
, bool merge_strings
)
2110 /* Do any machine/system dependent processing of the object. */
2111 #ifdef ASM_DECLARE_OBJECT_NAME
2112 last_assemble_variable_decl
= decl
;
2113 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
2115 /* Standard thing is just output label for the object. */
2116 ASM_OUTPUT_LABEL (asm_out_file
, name
);
2117 #endif /* ASM_DECLARE_OBJECT_NAME */
2119 if (!dont_output_data
)
2121 /* Caller is supposed to use varpool_get_constructor when it wants
2122 to output the body. */
2123 gcc_assert (!in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
);
2124 if (DECL_INITIAL (decl
)
2125 && DECL_INITIAL (decl
) != error_mark_node
2126 && !initializer_zerop (DECL_INITIAL (decl
)))
2127 /* Output the actual data. */
2128 output_constant (DECL_INITIAL (decl
),
2129 tree_to_uhwi (DECL_SIZE_UNIT (decl
)),
2130 get_variable_align (decl
),
2131 false, merge_strings
);
2133 /* Leave space for it. */
2134 assemble_zeros (tree_to_uhwi (DECL_SIZE_UNIT (decl
)));
2135 targetm
.asm_out
.decl_end ();
2139 /* Write out assembly for the variable DECL, which is not defined in
2140 the current translation unit. */
2142 assemble_undefined_decl (tree decl
)
2144 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
2145 targetm
.asm_out
.assemble_undefined_decl (asm_out_file
, name
, decl
);
2148 /* Assemble everything that is needed for a variable or function declaration.
2149 Not used for automatic variables, and not used for function definitions.
2150 Should not be called for variables of incomplete structure type.
2152 TOP_LEVEL is nonzero if this variable has file scope.
2153 AT_END is nonzero if this is the special handling, at end of compilation,
2154 to define things that have had only tentative definitions.
2155 DONT_OUTPUT_DATA if nonzero means don't actually output the
2156 initial value (that will be done by the caller). */
2159 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
2160 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
2163 rtx decl_rtl
, symbol
;
2166 bool asan_protected
= false;
2168 /* This function is supposed to handle VARIABLES. Ensure we have one. */
2169 gcc_assert (VAR_P (decl
));
2171 /* Emulated TLS had better not get this far. */
2172 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
2174 last_assemble_variable_decl
= 0;
2176 /* Normally no need to say anything here for external references,
2177 since assemble_external is called by the language-specific code
2178 when a declaration is first seen. */
2180 if (DECL_EXTERNAL (decl
))
2183 /* Do nothing for global register variables. */
2184 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
2186 TREE_ASM_WRITTEN (decl
) = 1;
2190 /* If type was incomplete when the variable was declared,
2191 see if it is complete now. */
2193 if (DECL_SIZE (decl
) == 0)
2194 layout_decl (decl
, 0);
2196 /* Still incomplete => don't allocate it; treat the tentative defn
2197 (which is what it must have been) as an `extern' reference. */
2199 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2201 error ("storage size of %q+D isn%'t known", decl
);
2202 TREE_ASM_WRITTEN (decl
) = 1;
2206 /* The first declaration of a variable that comes through this function
2207 decides whether it is global (in C, has external linkage)
2208 or local (in C, has internal linkage). So do nothing more
2209 if this function has already run. */
2211 if (TREE_ASM_WRITTEN (decl
))
2214 /* Make sure targetm.encode_section_info is invoked before we set
2216 decl_rtl
= DECL_RTL (decl
);
2218 TREE_ASM_WRITTEN (decl
) = 1;
2220 /* Do no output if -fsyntax-only. */
2221 if (flag_syntax_only
)
2224 if (! dont_output_data
2225 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
2227 error ("size of variable %q+D is too large", decl
);
2231 gcc_assert (MEM_P (decl_rtl
));
2232 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2233 symbol
= XEXP (decl_rtl
, 0);
2235 /* If this symbol belongs to the tree constant pool, output the constant
2236 if it hasn't already been written. */
2237 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
2239 tree decl
= SYMBOL_REF_DECL (symbol
);
2240 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
2241 output_constant_def_contents (symbol
);
2247 name
= XSTR (symbol
, 0);
2248 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2249 notice_global_symbol (decl
);
2251 /* Compute the alignment of this data. */
2253 align_variable (decl
, dont_output_data
);
2255 if ((flag_sanitize
& SANITIZE_ADDRESS
)
2256 && asan_protect_global (decl
))
2258 asan_protected
= true;
2259 SET_DECL_ALIGN (decl
, MAX (DECL_ALIGN (decl
),
2260 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
));
2263 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2265 align
= get_variable_align (decl
);
2267 if (TREE_PUBLIC (decl
))
2268 maybe_assemble_visibility (decl
);
2270 if (DECL_PRESERVE_P (decl
))
2271 targetm
.asm_out
.mark_decl_preserved (name
);
2273 /* First make the assembler name(s) global if appropriate. */
2274 sect
= get_variable_section (decl
, false);
2275 if (TREE_PUBLIC (decl
)
2276 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2277 globalize_decl (decl
);
2279 /* Output any data that we will need to use the address of. */
2280 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2281 output_addressed_constants (DECL_INITIAL (decl
), 0);
2283 /* dbxout.c needs to know this. */
2284 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2285 DECL_IN_TEXT_SECTION (decl
) = 1;
2287 /* If the decl is part of an object_block, make sure that the decl
2288 has been positioned within its block, but do not write out its
2289 definition yet. output_object_blocks will do that later. */
2290 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2292 gcc_assert (!dont_output_data
);
2293 place_block_symbol (symbol
);
2295 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2296 assemble_noswitch_variable (decl
, name
, sect
, align
);
2299 /* Special-case handling of vtv comdat sections. */
2300 if (sect
->named
.name
2301 && (strcmp (sect
->named
.name
, ".vtable_map_vars") == 0))
2302 handle_vtv_comdat_section (sect
, decl
);
2304 switch_to_section (sect
);
2305 if (align
> BITS_PER_UNIT
)
2306 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
2307 assemble_variable_contents (decl
, name
, dont_output_data
,
2308 (sect
->common
.flags
& SECTION_MERGE
)
2309 && (sect
->common
.flags
& SECTION_STRINGS
));
2312 unsigned HOST_WIDE_INT
int size
2313 = tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2314 assemble_zeros (asan_red_zone_size (size
));
2320 /* Given a function declaration (FN_DECL), this function assembles the
2321 function into the .preinit_array section. */
2324 assemble_vtv_preinit_initializer (tree fn_decl
)
2327 unsigned flags
= SECTION_WRITE
;
2328 rtx symbol
= XEXP (DECL_RTL (fn_decl
), 0);
2330 flags
|= SECTION_NOTYPE
;
2331 sect
= get_section (".preinit_array", flags
, fn_decl
);
2332 switch_to_section (sect
);
2333 assemble_addr_to_section (symbol
, sect
);
2336 /* Return 1 if type TYPE contains any pointers. */
2339 contains_pointers_p (tree type
)
2341 switch (TREE_CODE (type
))
2344 case REFERENCE_TYPE
:
2345 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2346 so I'll play safe and return 1. */
2352 case QUAL_UNION_TYPE
:
2355 /* For a type that has fields, see if the fields have pointers. */
2356 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2357 if (TREE_CODE (fields
) == FIELD_DECL
2358 && contains_pointers_p (TREE_TYPE (fields
)))
2364 /* An array type contains pointers if its element type does. */
2365 return contains_pointers_p (TREE_TYPE (type
));
2372 /* We delay assemble_external processing until
2373 the compilation unit is finalized. This is the best we can do for
2374 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2375 it all the way to final. See PR 17982 for further discussion. */
2376 static GTY(()) tree pending_assemble_externals
;
2378 #ifdef ASM_OUTPUT_EXTERNAL
2379 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2380 As a result, assemble_external can be called after the list of externals
2381 is processed and the pointer set destroyed. */
2382 static bool pending_assemble_externals_processed
;
2384 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2385 TREE_LIST in assemble_external. */
2386 static hash_set
<tree
> *pending_assemble_externals_set
;
2388 /* True if DECL is a function decl for which no out-of-line copy exists.
2389 It is assumed that DECL's assembler name has been set. */
2392 incorporeal_function_p (tree decl
)
2394 if (TREE_CODE (decl
) == FUNCTION_DECL
&& fndecl_built_in_p (decl
))
2398 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2399 && ALLOCA_FUNCTION_CODE_P (DECL_FUNCTION_CODE (decl
)))
2402 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2403 /* Atomic or sync builtins which have survived this far will be
2404 resolved externally and therefore are not incorporeal. */
2405 if (strncmp (name
, "__builtin_", 10) == 0)
2411 /* Actually do the tests to determine if this is necessary, and invoke
2412 ASM_OUTPUT_EXTERNAL. */
2414 assemble_external_real (tree decl
)
2416 rtx rtl
= DECL_RTL (decl
);
2418 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2419 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2420 && !incorporeal_function_p (decl
))
2422 /* Some systems do require some output. */
2423 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2424 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2430 process_pending_assemble_externals (void)
2432 #ifdef ASM_OUTPUT_EXTERNAL
2434 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2435 assemble_external_real (TREE_VALUE (list
));
2437 pending_assemble_externals
= 0;
2438 pending_assemble_externals_processed
= true;
2439 delete pending_assemble_externals_set
;
2443 /* This TREE_LIST contains any weak symbol declarations waiting
2445 static GTY(()) tree weak_decls
;
2447 /* Output something to declare an external symbol to the assembler,
2448 and qualifiers such as weakness. (Most assemblers don't need
2449 extern declaration, so we normally output nothing.) Do nothing if
2450 DECL is not external. */
2453 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2455 /* Make sure that the ASM_OUT_FILE is open.
2456 If it's not, we should not be calling this function. */
2457 gcc_assert (asm_out_file
);
2459 /* In a perfect world, the following condition would be true.
2460 Sadly, the Go front end emit assembly *from the front end*,
2461 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2463 /* This function should only be called if we are expanding, or have
2465 Ideally, only final.c would be calling this function, but it is
2466 not clear whether that would break things somehow. See PR 17982
2467 for further discussion. */
2468 gcc_assert (state
== EXPANSION
2469 || state
== FINISHED
);
2472 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2475 /* We want to output annotation for weak and external symbols at
2476 very last to check if they are references or not. */
2478 if (TARGET_SUPPORTS_WEAK
2480 /* TREE_STATIC is a weird and abused creature which is not
2481 generally the right test for whether an entity has been
2482 locally emitted, inlined or otherwise not-really-extern, but
2483 for declarations that can be weak, it happens to be
2485 && !TREE_STATIC (decl
)
2486 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2487 && value_member (decl
, weak_decls
) == NULL_TREE
)
2488 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2490 #ifdef ASM_OUTPUT_EXTERNAL
2491 if (pending_assemble_externals_processed
)
2493 assemble_external_real (decl
);
2497 if (! pending_assemble_externals_set
->add (decl
))
2498 pending_assemble_externals
= tree_cons (NULL
, decl
,
2499 pending_assemble_externals
);
2503 /* Similar, for calling a library function FUN. */
2506 assemble_external_libcall (rtx fun
)
2508 /* Declare library function name external when first used, if nec. */
2509 if (! SYMBOL_REF_USED (fun
))
2511 SYMBOL_REF_USED (fun
) = 1;
2512 targetm
.asm_out
.external_libcall (fun
);
2516 /* Assemble a label named NAME. */
2519 assemble_label (FILE *file
, const char *name
)
2521 ASM_OUTPUT_LABEL (file
, name
);
2524 /* Set the symbol_referenced flag for ID. */
2526 mark_referenced (tree id
)
2528 TREE_SYMBOL_REFERENCED (id
) = 1;
2531 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2533 mark_decl_referenced (tree decl
)
2535 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2537 /* Extern inline functions don't become needed when referenced.
2538 If we know a method will be emitted in other TU and no new
2539 functions can be marked reachable, just use the external
2541 struct cgraph_node
*node
= cgraph_node::get_create (decl
);
2542 if (!DECL_EXTERNAL (decl
)
2543 && !node
->definition
)
2544 node
->mark_force_output ();
2546 else if (VAR_P (decl
))
2548 varpool_node
*node
= varpool_node::get_create (decl
);
2549 /* C++ frontend use mark_decl_references to force COMDAT variables
2550 to be output that might appear dead otherwise. */
2551 node
->force_output
= true;
2553 /* else do nothing - we can get various sorts of CST nodes here,
2554 which do not need to be marked. */
2558 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2559 starts with a *, the rest of NAME is output verbatim. Otherwise
2560 NAME is transformed in a target-specific way (usually by the
2561 addition of an underscore). */
2564 assemble_name_raw (FILE *file
, const char *name
)
2567 fputs (&name
[1], file
);
2569 ASM_OUTPUT_LABELREF (file
, name
);
2572 /* Return NAME that should actually be emitted, looking through
2573 transparent aliases. If NAME refers to an entity that is also
2574 represented as a tree (like a function or variable), mark the entity
2577 assemble_name_resolve (const char *name
)
2579 const char *real_name
= targetm
.strip_name_encoding (name
);
2580 tree id
= maybe_get_identifier (real_name
);
2586 mark_referenced (id
);
2587 ultimate_transparent_alias_target (&id
);
2589 name
= IDENTIFIER_POINTER (id
);
2590 gcc_assert (! TREE_CHAIN (id
));
2596 /* Like assemble_name_raw, but should be used when NAME might refer to
2597 an entity that is also represented as a tree (like a function or
2598 variable). If NAME does refer to such an entity, that entity will
2599 be marked as referenced. */
2602 assemble_name (FILE *file
, const char *name
)
2604 assemble_name_raw (file
, assemble_name_resolve (name
));
2607 /* Allocate SIZE bytes writable static space with a gensym name
2608 and return an RTX to refer to its address. */
2611 assemble_static_space (unsigned HOST_WIDE_INT size
)
2614 const char *namestring
;
2617 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2619 namestring
= ggc_strdup (name
);
2621 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2622 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2624 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2625 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2628 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2629 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2632 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2633 so that each uninitialized object starts on such a boundary. */
2634 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2635 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2636 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2637 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2638 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2639 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2646 /* Assemble the static constant template for function entry trampolines.
2647 This is done at most once per compilation.
2648 Returns an RTX for the address of the template. */
2650 static GTY(()) rtx initial_trampoline
;
2653 assemble_trampoline_template (void)
2660 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2662 if (initial_trampoline
)
2663 return initial_trampoline
;
2665 /* By default, put trampoline templates in read-only data section. */
2667 #ifdef TRAMPOLINE_SECTION
2668 switch_to_section (TRAMPOLINE_SECTION
);
2670 switch_to_section (readonly_data_section
);
2673 /* Write the assembler code to define one. */
2674 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2676 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2678 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2679 targetm
.asm_out
.trampoline_template (asm_out_file
);
2681 /* Record the rtl to refer to it. */
2682 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2683 name
= ggc_strdup (label
);
2684 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2685 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2687 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2688 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2689 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2691 return initial_trampoline
;
2694 /* A and B are either alignments or offsets. Return the minimum alignment
2695 that may be assumed after adding the two together. */
2697 static inline unsigned
2698 min_align (unsigned int a
, unsigned int b
)
2700 return least_bit_hwi (a
| b
);
2703 /* Return the assembler directive for creating a given kind of integer
2704 object. SIZE is the number of bytes in the object and ALIGNED_P
2705 indicates whether it is known to be aligned. Return NULL if the
2706 assembly dialect has no such directive.
2708 The returned string should be printed at the start of a new line and
2709 be followed immediately by the object's initial value. */
2712 integer_asm_op (int size
, int aligned_p
)
2714 struct asm_int_op
*ops
;
2717 ops
= &targetm
.asm_out
.aligned_op
;
2719 ops
= &targetm
.asm_out
.unaligned_op
;
2724 return targetm
.asm_out
.byte_op
;
2752 /* Use directive OP to assemble an integer object X. Print OP at the
2753 start of the line, followed immediately by the value of X. */
2756 assemble_integer_with_op (const char *op
, rtx x
)
2758 fputs (op
, asm_out_file
);
2759 output_addr_const (asm_out_file
, x
);
2760 fputc ('\n', asm_out_file
);
2763 /* The default implementation of the asm_out.integer target hook. */
2766 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2767 unsigned int size ATTRIBUTE_UNUSED
,
2768 int aligned_p ATTRIBUTE_UNUSED
)
2770 const char *op
= integer_asm_op (size
, aligned_p
);
2771 /* Avoid GAS bugs for large values. Specifically negative values whose
2772 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2773 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE_UNITS
)
2775 return op
&& (assemble_integer_with_op (op
, x
), true);
2778 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2779 the alignment of the integer in bits. Return 1 if we were able to output
2780 the constant, otherwise 0. We must be able to output the constant,
2781 if FORCE is nonzero. */
2784 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2788 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2790 /* See if the target hook can handle this kind of object. */
2791 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2794 /* If the object is a multi-byte one, try splitting it up. Split
2795 it into words it if is multi-word, otherwise split it into bytes. */
2798 machine_mode omode
, imode
;
2799 unsigned int subalign
;
2800 unsigned int subsize
, i
;
2801 enum mode_class mclass
;
2803 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2804 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2805 if (GET_CODE (x
) == CONST_FIXED
)
2806 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2810 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0).require ();
2811 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0).require ();
2813 for (i
= 0; i
< size
; i
+= subsize
)
2815 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2816 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2822 /* If we've printed some of it, but not all of it, there's no going
2827 gcc_assert (!force
);
2832 /* Assemble the floating-point constant D into an object of size MODE. ALIGN
2833 is the alignment of the constant in bits. If REVERSE is true, D is output
2834 in reverse storage order. */
2837 assemble_real (REAL_VALUE_TYPE d
, scalar_float_mode mode
, unsigned int align
,
2840 long data
[4] = {0, 0, 0, 0};
2841 int bitsize
, nelts
, nunits
, units_per
;
2844 /* This is hairy. We have a quantity of known size. real_to_target
2845 will put it into an array of *host* longs, 32 bits per element
2846 (even if long is more than 32 bits). We need to determine the
2847 number of array elements that are occupied (nelts) and the number
2848 of *target* min-addressable units that will be occupied in the
2849 object file (nunits). We cannot assume that 32 divides the
2850 mode's bitsize (size * BITS_PER_UNIT) evenly.
2852 size * BITS_PER_UNIT is used here to make sure that padding bits
2853 (which might appear at either end of the value; real_to_target
2854 will include the padding bits in its output array) are included. */
2856 nunits
= GET_MODE_SIZE (mode
);
2857 bitsize
= nunits
* BITS_PER_UNIT
;
2858 nelts
= CEIL (bitsize
, 32);
2859 units_per
= 32 / BITS_PER_UNIT
;
2861 real_to_target (data
, &d
, mode
);
2863 /* Put out the first word with the specified alignment. */
2864 unsigned int chunk_nunits
= MIN (nunits
, units_per
);
2866 elt
= flip_storage_order (SImode
, gen_int_mode (data
[nelts
- 1], SImode
));
2868 elt
= GEN_INT (sext_hwi (data
[0], chunk_nunits
* BITS_PER_UNIT
));
2869 assemble_integer (elt
, chunk_nunits
, align
, 1);
2870 nunits
-= chunk_nunits
;
2872 /* Subsequent words need only 32-bit alignment. */
2873 align
= min_align (align
, 32);
2875 for (int i
= 1; i
< nelts
; i
++)
2877 chunk_nunits
= MIN (nunits
, units_per
);
2879 elt
= flip_storage_order (SImode
,
2880 gen_int_mode (data
[nelts
- 1 - i
], SImode
));
2882 elt
= GEN_INT (sext_hwi (data
[i
], chunk_nunits
* BITS_PER_UNIT
));
2883 assemble_integer (elt
, chunk_nunits
, align
, 1);
2884 nunits
-= chunk_nunits
;
2888 /* Given an expression EXP with a constant value,
2889 reduce it to the sum of an assembler symbol and an integer.
2890 Store them both in the structure *VALUE.
2891 EXP must be reducible. */
2900 decode_addr_const (tree exp
, class addr_const
*value
)
2902 tree target
= TREE_OPERAND (exp
, 0);
2903 poly_int64 offset
= 0;
2909 if (TREE_CODE (target
) == COMPONENT_REF
2910 && poly_int_tree_p (byte_position (TREE_OPERAND (target
, 1)),
2914 target
= TREE_OPERAND (target
, 0);
2916 else if (TREE_CODE (target
) == ARRAY_REF
2917 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2919 /* Truncate big offset. */
2921 += (TREE_INT_CST_LOW (TYPE_SIZE_UNIT (TREE_TYPE (target
)))
2922 * wi::to_poly_widest (TREE_OPERAND (target
, 1)).force_shwi ());
2923 target
= TREE_OPERAND (target
, 0);
2925 else if (TREE_CODE (target
) == MEM_REF
2926 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2928 offset
+= mem_ref_offset (target
).force_shwi ();
2929 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2931 else if (TREE_CODE (target
) == INDIRECT_REF
2932 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2933 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2935 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2940 switch (TREE_CODE (target
))
2944 x
= DECL_RTL (target
);
2948 x
= gen_rtx_MEM (FUNCTION_MODE
,
2949 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2958 x
= lookup_constant_def (target
);
2959 /* Should have been added by output_addressed_constants. */
2964 /* This deals with absolute addresses. */
2965 offset
+= tree_to_shwi (TREE_OPERAND (target
, 0));
2966 x
= gen_rtx_MEM (QImode
,
2967 gen_rtx_SYMBOL_REF (Pmode
, "origin of addresses"));
2970 case COMPOUND_LITERAL_EXPR
:
2971 gcc_assert (COMPOUND_LITERAL_EXPR_DECL (target
));
2972 x
= DECL_RTL (COMPOUND_LITERAL_EXPR_DECL (target
));
2979 gcc_assert (MEM_P (x
));
2983 value
->offset
= offset
;
2986 static GTY(()) hash_table
<tree_descriptor_hasher
> *const_desc_htab
;
2988 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2990 /* Constant pool accessor function. */
2992 hash_table
<tree_descriptor_hasher
> *
2993 constant_pool_htab (void)
2995 return const_desc_htab
;
2998 /* Compute a hash code for a constant expression. */
3001 tree_descriptor_hasher::hash (constant_descriptor_tree
*ptr
)
3007 const_hash_1 (const tree exp
)
3012 enum tree_code code
= TREE_CODE (exp
);
3014 /* Either set P and LEN to the address and len of something to hash and
3015 exit the switch or return a value. */
3020 p
= (char *) &TREE_INT_CST_ELT (exp
, 0);
3021 len
= TREE_INT_CST_NUNITS (exp
) * sizeof (HOST_WIDE_INT
);
3025 return real_hash (TREE_REAL_CST_PTR (exp
));
3028 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
3031 p
= TREE_STRING_POINTER (exp
);
3032 len
= TREE_STRING_LENGTH (exp
);
3036 return (const_hash_1 (TREE_REALPART (exp
)) * 5
3037 + const_hash_1 (TREE_IMAGPART (exp
)));
3041 hi
= 7 + VECTOR_CST_NPATTERNS (exp
);
3042 hi
= hi
* 563 + VECTOR_CST_NELTS_PER_PATTERN (exp
);
3043 unsigned int count
= vector_cst_encoded_nelts (exp
);
3044 for (unsigned int i
= 0; i
< count
; ++i
)
3045 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ENCODED_ELT (exp
, i
));
3051 unsigned HOST_WIDE_INT idx
;
3054 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
3056 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
3058 hi
= hi
* 603 + const_hash_1 (value
);
3064 if (CONSTANT_CLASS_P (TREE_OPERAND (exp
, 0)))
3065 return const_hash_1 (TREE_OPERAND (exp
, 0));
3070 class addr_const value
;
3072 decode_addr_const (exp
, &value
);
3073 switch (GET_CODE (value
.base
))
3076 /* Don't hash the address of the SYMBOL_REF;
3077 only use the offset and the symbol name. */
3078 hi
= value
.offset
.coeffs
[0];
3079 p
= XSTR (value
.base
, 0);
3080 for (i
= 0; p
[i
] != 0; i
++)
3081 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3085 hi
= (value
.offset
.coeffs
[0]
3086 + CODE_LABEL_NUMBER (label_ref_label (value
.base
)) * 13);
3096 case POINTER_PLUS_EXPR
:
3098 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
3099 + const_hash_1 (TREE_OPERAND (exp
, 1)));
3102 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
3105 /* A language specific constant. Just hash the code. */
3109 /* Compute hashing function. */
3111 for (i
= 0; i
< len
; i
++)
3112 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3117 /* Wrapper of compare_constant, for the htab interface. */
3119 tree_descriptor_hasher::equal (constant_descriptor_tree
*c1
,
3120 constant_descriptor_tree
*c2
)
3122 if (c1
->hash
!= c2
->hash
)
3124 return compare_constant (c1
->value
, c2
->value
);
3127 /* Compare t1 and t2, and return 1 only if they are known to result in
3128 the same bit pattern on output. */
3131 compare_constant (const tree t1
, const tree t2
)
3133 enum tree_code typecode
;
3135 if (t1
== NULL_TREE
)
3136 return t2
== NULL_TREE
;
3137 if (t2
== NULL_TREE
)
3140 if (TREE_CODE (t1
) != TREE_CODE (t2
))
3143 switch (TREE_CODE (t1
))
3146 /* Integer constants are the same only if the same width of type. */
3147 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3149 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3151 return tree_int_cst_equal (t1
, t2
);
3154 /* Real constants are the same only if the same width of type. In
3155 addition to the same width, we need to check whether the modes are the
3156 same. There might be two floating point modes that are the same size
3157 but have different representations, such as the PowerPC that has 2
3158 different 128-bit floating point types (IBM extended double and IEEE
3159 128-bit floating point). */
3160 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3162 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3164 return real_identical (&TREE_REAL_CST (t1
), &TREE_REAL_CST (t2
));
3167 /* Fixed constants are the same only if the same width of type. */
3168 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3171 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
3174 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
3175 || int_size_in_bytes (TREE_TYPE (t1
))
3176 != int_size_in_bytes (TREE_TYPE (t2
)))
3179 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
3180 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
3181 TREE_STRING_LENGTH (t1
)));
3184 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
3185 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
3189 if (VECTOR_CST_NPATTERNS (t1
)
3190 != VECTOR_CST_NPATTERNS (t2
))
3193 if (VECTOR_CST_NELTS_PER_PATTERN (t1
)
3194 != VECTOR_CST_NELTS_PER_PATTERN (t2
))
3197 unsigned int count
= vector_cst_encoded_nelts (t1
);
3198 for (unsigned int i
= 0; i
< count
; ++i
)
3199 if (!compare_constant (VECTOR_CST_ENCODED_ELT (t1
, i
),
3200 VECTOR_CST_ENCODED_ELT (t2
, i
)))
3208 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
3209 unsigned HOST_WIDE_INT idx
;
3211 typecode
= TREE_CODE (TREE_TYPE (t1
));
3212 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
3215 if (typecode
== ARRAY_TYPE
)
3217 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
3218 /* For arrays, check that mode, size and storage order match. */
3219 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
3221 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
))
3222 || TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (t1
))
3223 != TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (t2
)))
3228 /* For record and union constructors, require exact type
3230 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
3234 v1
= CONSTRUCTOR_ELTS (t1
);
3235 v2
= CONSTRUCTOR_ELTS (t2
);
3236 if (vec_safe_length (v1
) != vec_safe_length (v2
))
3239 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
3241 constructor_elt
*c1
= &(*v1
)[idx
];
3242 constructor_elt
*c2
= &(*v2
)[idx
];
3244 /* Check that each value is the same... */
3245 if (!compare_constant (c1
->value
, c2
->value
))
3247 /* ... and that they apply to the same fields! */
3248 if (typecode
== ARRAY_TYPE
)
3250 if (!compare_constant (c1
->index
, c2
->index
))
3255 if (c1
->index
!= c2
->index
)
3266 class addr_const value1
, value2
;
3270 decode_addr_const (t1
, &value1
);
3271 decode_addr_const (t2
, &value2
);
3273 if (maybe_ne (value1
.offset
, value2
.offset
))
3276 code
= GET_CODE (value1
.base
);
3277 if (code
!= GET_CODE (value2
.base
))
3283 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3287 ret
= (CODE_LABEL_NUMBER (label_ref_label (value1
.base
))
3288 == CODE_LABEL_NUMBER (label_ref_label (value2
.base
)));
3298 case POINTER_PLUS_EXPR
:
3301 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3302 && compare_constant (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3305 case VIEW_CONVERT_EXPR
:
3306 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3315 /* Return the section into which constant EXP should be placed. */
3318 get_constant_section (tree exp
, unsigned int align
)
3320 return targetm
.asm_out
.select_section (exp
,
3321 compute_reloc_for_constant (exp
),
3325 /* Return the size of constant EXP in bytes. */
3327 static HOST_WIDE_INT
3328 get_constant_size (tree exp
)
3332 size
= int_size_in_bytes (TREE_TYPE (exp
));
3333 gcc_checking_assert (size
>= 0);
3334 gcc_checking_assert (TREE_CODE (exp
) != STRING_CST
3335 || size
>= TREE_STRING_LENGTH (exp
));
3339 /* Subroutine of output_constant_def:
3340 No constant equal to EXP is known to have been output.
3341 Make a constant descriptor to enter EXP in the hash table.
3342 Assign the label number and construct RTL to refer to the
3343 constant's location in memory.
3344 Caller is responsible for updating the hash table. */
3346 static struct constant_descriptor_tree
*
3347 build_constant_desc (tree exp
)
3349 struct constant_descriptor_tree
*desc
;
3355 desc
= ggc_alloc
<constant_descriptor_tree
> ();
3358 /* Create a string containing the label name, in LABEL. */
3359 labelno
= const_labelno
++;
3360 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3362 /* Construct the VAR_DECL associated with the constant. */
3363 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3365 DECL_ARTIFICIAL (decl
) = 1;
3366 DECL_IGNORED_P (decl
) = 1;
3367 TREE_READONLY (decl
) = 1;
3368 TREE_STATIC (decl
) = 1;
3369 TREE_ADDRESSABLE (decl
) = 1;
3370 /* We don't set the RTL yet as this would cause varpool to assume that the
3371 variable is referenced. Moreover, it would just be dropped in LTO mode.
3372 Instead we set the flag that will be recognized in make_decl_rtl. */
3373 DECL_IN_CONSTANT_POOL (decl
) = 1;
3374 DECL_INITIAL (decl
) = desc
->value
;
3375 /* ??? targetm.constant_alignment hasn't been updated for vector types on
3376 most architectures so use DATA_ALIGNMENT as well, except for strings. */
3377 if (TREE_CODE (exp
) == STRING_CST
)
3378 SET_DECL_ALIGN (decl
, targetm
.constant_alignment (exp
, DECL_ALIGN (decl
)));
3381 align_variable (decl
, 0);
3382 if (DECL_ALIGN (decl
) < GET_MODE_ALIGNMENT (DECL_MODE (decl
))
3383 && ((optab_handler (movmisalign_optab
, DECL_MODE (decl
))
3384 != CODE_FOR_nothing
)
3385 || targetm
.slow_unaligned_access (DECL_MODE (decl
),
3386 DECL_ALIGN (decl
))))
3387 SET_DECL_ALIGN (decl
, GET_MODE_ALIGNMENT (DECL_MODE (decl
)));
3390 /* Now construct the SYMBOL_REF and the MEM. */
3391 if (use_object_blocks_p ())
3393 int align
= (TREE_CODE (decl
) == CONST_DECL
3394 || (VAR_P (decl
) && DECL_IN_CONSTANT_POOL (decl
))
3396 : symtab_node::get (decl
)->definition_alignment ());
3397 section
*sect
= get_constant_section (exp
, align
);
3398 symbol
= create_block_symbol (ggc_strdup (label
),
3399 get_block_for_section (sect
), -1);
3402 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3403 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3404 SET_SYMBOL_REF_DECL (symbol
, decl
);
3405 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3407 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3408 set_mem_alias_set (rtl
, 0);
3410 /* Putting EXP into the literal pool might have imposed a different
3411 alignment which should be visible in the RTX as well. */
3412 set_mem_align (rtl
, DECL_ALIGN (decl
));
3414 /* We cannot share RTX'es in pool entries.
3415 Mark this piece of RTL as required for unsharing. */
3416 RTX_FLAG (rtl
, used
) = 1;
3418 /* Set flags or add text to the name to record information, such as
3419 that it is a local symbol. If the name is changed, the macro
3420 ASM_OUTPUT_LABELREF will have to know how to strip this
3421 information. This call might invalidate our local variable
3422 SYMBOL; we can't use it afterward. */
3423 targetm
.encode_section_info (exp
, rtl
, true);
3430 /* Subroutine of output_constant_def and tree_output_constant_def:
3431 Add a constant to the hash table that tracks which constants
3432 already have labels. */
3434 static constant_descriptor_tree
*
3435 add_constant_to_table (tree exp
, int defer
)
3437 /* The hash table methods may call output_constant_def for addressed
3438 constants, so handle them first. */
3439 output_addressed_constants (exp
, defer
);
3441 /* Sanity check to catch recursive insertion. */
3442 static bool inserting
;
3443 gcc_assert (!inserting
);
3446 /* Look up EXP in the table of constant descriptors. If we didn't
3447 find it, create a new one. */
3448 struct constant_descriptor_tree key
;
3450 key
.hash
= const_hash_1 (exp
);
3451 constant_descriptor_tree
**loc
3452 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3456 struct constant_descriptor_tree
*desc
= *loc
;
3459 desc
= build_constant_desc (exp
);
3460 desc
->hash
= key
.hash
;
3467 /* Return an rtx representing a reference to constant data in memory
3468 for the constant expression EXP.
3470 If assembler code for such a constant has already been output,
3471 return an rtx to refer to it.
3472 Otherwise, output such a constant in memory
3473 and generate an rtx for it.
3475 If DEFER is nonzero, this constant can be deferred and output only
3476 if referenced in the function after all optimizations.
3478 `const_desc_table' records which constants already have label strings. */
3481 output_constant_def (tree exp
, int defer
)
3483 struct constant_descriptor_tree
*desc
= add_constant_to_table (exp
, defer
);
3484 maybe_output_constant_def_contents (desc
, defer
);
3488 /* Subroutine of output_constant_def: Decide whether or not we need to
3489 output the constant DESC now, and if so, do it. */
3491 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3494 rtx symbol
= XEXP (desc
->rtl
, 0);
3495 tree exp
= desc
->value
;
3497 if (flag_syntax_only
)
3500 if (TREE_ASM_WRITTEN (exp
))
3501 /* Already output; don't do it again. */
3504 /* We can always defer constants as long as the context allows
3508 /* Increment n_deferred_constants if it exists. It needs to be at
3509 least as large as the number of constants actually referred to
3510 by the function. If it's too small we'll stop looking too early
3511 and fail to emit constants; if it's too large we'll only look
3512 through the entire function when we could have stopped earlier. */
3514 n_deferred_constants
++;
3518 output_constant_def_contents (symbol
);
3521 /* Subroutine of output_constant_def_contents. Output the definition
3522 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3523 constant's alignment in bits. */
3526 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
,
3531 size
= get_constant_size (exp
);
3533 /* Do any machine/system dependent processing of the constant. */
3534 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3536 /* Output the value of EXP. */
3537 output_constant (exp
, size
, align
, false, merge_strings
);
3539 targetm
.asm_out
.decl_end ();
3542 /* We must output the constant data referred to by SYMBOL; do so. */
3545 output_constant_def_contents (rtx symbol
)
3547 tree decl
= SYMBOL_REF_DECL (symbol
);
3548 tree exp
= DECL_INITIAL (decl
);
3549 bool asan_protected
= false;
3551 /* Make sure any other constants whose addresses appear in EXP
3552 are assigned label numbers. */
3553 output_addressed_constants (exp
, 0);
3555 /* We are no longer deferring this constant. */
3556 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3558 if ((flag_sanitize
& SANITIZE_ADDRESS
)
3559 && TREE_CODE (exp
) == STRING_CST
3560 && asan_protect_global (exp
))
3562 asan_protected
= true;
3563 SET_DECL_ALIGN (decl
, MAX (DECL_ALIGN (decl
),
3564 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
));
3567 /* If the constant is part of an object block, make sure that the
3568 decl has been positioned within its block, but do not write out
3569 its definition yet. output_object_blocks will do that later. */
3570 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3571 place_block_symbol (symbol
);
3574 int align
= (TREE_CODE (decl
) == CONST_DECL
3575 || (VAR_P (decl
) && DECL_IN_CONSTANT_POOL (decl
))
3577 : symtab_node::get (decl
)->definition_alignment ());
3578 section
*sect
= get_constant_section (exp
, align
);
3579 switch_to_section (sect
);
3580 if (align
> BITS_PER_UNIT
)
3581 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3582 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
,
3583 (sect
->common
.flags
& SECTION_MERGE
)
3584 && (sect
->common
.flags
& SECTION_STRINGS
));
3587 HOST_WIDE_INT size
= get_constant_size (exp
);
3588 assemble_zeros (asan_red_zone_size (size
));
3593 /* Look up EXP in the table of constant descriptors. Return the rtl
3594 if it has been emitted, else null. */
3597 lookup_constant_def (tree exp
)
3599 struct constant_descriptor_tree key
;
3602 key
.hash
= const_hash_1 (exp
);
3603 constant_descriptor_tree
*desc
3604 = const_desc_htab
->find_with_hash (&key
, key
.hash
);
3606 return (desc
? desc
->rtl
: NULL_RTX
);
3609 /* Return a tree representing a reference to constant data in memory
3610 for the constant expression EXP.
3612 This is the counterpart of output_constant_def at the Tree level. */
3615 tree_output_constant_def (tree exp
)
3617 struct constant_descriptor_tree
*desc
= add_constant_to_table (exp
, 1);
3618 tree decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3619 varpool_node::finalize_decl (decl
);
3623 class GTY((chain_next ("%h.next"), for_user
)) constant_descriptor_rtx
{
3625 class constant_descriptor_rtx
*next
;
3629 HOST_WIDE_INT offset
;
3631 fixed_size_mode mode
;
3637 struct const_rtx_desc_hasher
: ggc_ptr_hash
<constant_descriptor_rtx
>
3639 static hashval_t
hash (constant_descriptor_rtx
*);
3640 static bool equal (constant_descriptor_rtx
*, constant_descriptor_rtx
*);
3643 /* Used in the hash tables to avoid outputting the same constant
3644 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3645 are output once per function, not once per file. */
3646 /* ??? Only a few targets need per-function constant pools. Most
3647 can use one per-file pool. Should add a targetm bit to tell the
3650 struct GTY(()) rtx_constant_pool
{
3651 /* Pointers to first and last constant in pool, as ordered by offset. */
3652 class constant_descriptor_rtx
*first
;
3653 class constant_descriptor_rtx
*last
;
3655 /* Hash facility for making memory-constants from constant rtl-expressions.
3656 It is used on RISC machines where immediate integer arguments and
3657 constant addresses are restricted so that such constants must be stored
3659 hash_table
<const_rtx_desc_hasher
> *const_rtx_htab
;
3661 /* Current offset in constant pool (does not include any
3662 machine-specific header). */
3663 HOST_WIDE_INT offset
;
3666 /* Hash and compare functions for const_rtx_htab. */
3669 const_rtx_desc_hasher::hash (constant_descriptor_rtx
*desc
)
3675 const_rtx_desc_hasher::equal (constant_descriptor_rtx
*x
,
3676 constant_descriptor_rtx
*y
)
3678 if (x
->mode
!= y
->mode
)
3680 return rtx_equal_p (x
->constant
, y
->constant
);
3683 /* Hash one component of a constant. */
3686 const_rtx_hash_1 (const_rtx x
)
3688 unsigned HOST_WIDE_INT hwi
;
3694 code
= GET_CODE (x
);
3695 mode
= GET_MODE (x
);
3696 h
= (hashval_t
) code
* 1048573 + mode
;
3705 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3706 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3708 h
^= (hashval_t
) hwi
;
3709 for (i
= 1; i
< n
; ++i
)
3712 h
^= (hashval_t
) hwi
;
3717 case CONST_WIDE_INT
:
3720 for (i
= 0; i
< CONST_WIDE_INT_NUNITS (x
); i
++)
3721 hwi
^= CONST_WIDE_INT_ELT (x
, i
);
3726 if (TARGET_SUPPORTS_WIDE_INT
== 0 && mode
== VOIDmode
)
3728 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3732 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3736 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3740 h
^= htab_hash_string (XSTR (x
, 0));
3744 h
= h
* 251 + CODE_LABEL_NUMBER (label_ref_label (x
));
3748 case UNSPEC_VOLATILE
:
3749 h
= h
* 251 + XINT (x
, 1);
3759 /* Compute a hash value for X, which should be a constant. */
3762 const_rtx_hash (rtx x
)
3765 subrtx_iterator::array_type array
;
3766 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
3767 h
= h
* 509 + const_rtx_hash_1 (*iter
);
3772 /* Create and return a new rtx constant pool. */
3774 static struct rtx_constant_pool
*
3775 create_constant_pool (void)
3777 struct rtx_constant_pool
*pool
;
3779 pool
= ggc_alloc
<rtx_constant_pool
> ();
3780 pool
->const_rtx_htab
= hash_table
<const_rtx_desc_hasher
>::create_ggc (31);
3787 /* Initialize constant pool hashing for a new function. */
3790 init_varasm_status (void)
3792 crtl
->varasm
.pool
= create_constant_pool ();
3793 crtl
->varasm
.deferred_constants
= 0;
3796 /* Given a MINUS expression, simplify it if both sides
3797 include the same symbol. */
3800 simplify_subtraction (rtx x
)
3802 rtx r
= simplify_rtx (x
);
3806 /* Given a constant rtx X, make (or find) a memory constant for its value
3807 and return a MEM rtx to refer to it in memory. IN_MODE is the mode
3811 force_const_mem (machine_mode in_mode
, rtx x
)
3813 class constant_descriptor_rtx
*desc
, tmp
;
3814 struct rtx_constant_pool
*pool
;
3819 constant_descriptor_rtx
**slot
;
3820 fixed_size_mode mode
;
3822 /* We can't force variable-sized objects to memory. */
3823 if (!is_a
<fixed_size_mode
> (in_mode
, &mode
))
3826 /* If we're not allowed to drop X into the constant pool, don't. */
3827 if (targetm
.cannot_force_const_mem (mode
, x
))
3830 /* Record that this function has used a constant pool entry. */
3831 crtl
->uses_const_pool
= 1;
3833 /* Decide which pool to use. */
3834 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3835 ? shared_constant_pool
3836 : crtl
->varasm
.pool
);
3838 /* Lookup the value in the hashtable. */
3841 hash
= const_rtx_hash (x
);
3842 slot
= pool
->const_rtx_htab
->find_slot_with_hash (&tmp
, hash
, INSERT
);
3845 /* If the constant was already present, return its memory. */
3847 return copy_rtx (desc
->mem
);
3849 /* Otherwise, create a new descriptor. */
3850 desc
= ggc_alloc
<constant_descriptor_rtx
> ();
3853 /* Align the location counter as required by EXP's data type. */
3854 machine_mode align_mode
= (mode
== VOIDmode
? word_mode
: mode
);
3855 align
= targetm
.static_rtx_alignment (align_mode
);
3857 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3858 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3861 desc
->constant
= copy_rtx (tmp
.constant
);
3862 desc
->offset
= pool
->offset
;
3865 desc
->align
= align
;
3866 desc
->labelno
= const_labelno
;
3869 pool
->offset
+= GET_MODE_SIZE (mode
);
3871 pool
->last
->next
= desc
;
3873 pool
->first
= pool
->last
= desc
;
3876 /* Create a string containing the label name, in LABEL. */
3877 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3880 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3881 the constants pool. */
3882 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3884 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3885 symbol
= create_block_symbol (ggc_strdup (label
),
3886 get_block_for_section (sect
), -1);
3889 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3891 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3892 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3893 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3895 /* Construct the MEM. */
3896 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3897 set_mem_align (def
, align
);
3899 /* If we're dropping a label to the constant pool, make sure we
3901 if (GET_CODE (x
) == LABEL_REF
)
3902 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3904 return copy_rtx (def
);
3907 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3910 get_pool_constant (const_rtx addr
)
3912 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3915 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3916 and whether it has been output or not. */
3919 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3921 class constant_descriptor_rtx
*desc
;
3923 desc
= SYMBOL_REF_CONSTANT (addr
);
3924 *pmarked
= (desc
->mark
!= 0);
3925 return desc
->constant
;
3928 /* Similar, return the mode. */
3931 get_pool_mode (const_rtx addr
)
3933 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3936 /* Return TRUE if and only if the constant pool has no entries. Note
3937 that even entries we might end up choosing not to emit are counted
3938 here, so there is the potential for missed optimizations. */
3941 constant_pool_empty_p (void)
3943 return crtl
->varasm
.pool
->first
== NULL
;
3946 /* Worker function for output_constant_pool_1. Emit assembly for X
3947 in MODE with known alignment ALIGN. */
3950 output_constant_pool_2 (fixed_size_mode mode
, rtx x
, unsigned int align
)
3952 switch (GET_MODE_CLASS (mode
))
3955 case MODE_DECIMAL_FLOAT
:
3957 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3958 assemble_real (*CONST_DOUBLE_REAL_VALUE (x
),
3959 as_a
<scalar_float_mode
> (mode
), align
, false);
3964 case MODE_PARTIAL_INT
:
3969 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3972 case MODE_VECTOR_BOOL
:
3974 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3976 /* Pick the smallest integer mode that contains at least one
3977 whole element. Often this is byte_mode and contains more
3978 than one element. */
3979 unsigned int nelts
= GET_MODE_NUNITS (mode
);
3980 unsigned int elt_bits
= GET_MODE_BITSIZE (mode
) / nelts
;
3981 unsigned int int_bits
= MAX (elt_bits
, BITS_PER_UNIT
);
3982 scalar_int_mode int_mode
= int_mode_for_size (int_bits
, 0).require ();
3984 /* Build the constant up one integer at a time. */
3985 unsigned int elts_per_int
= int_bits
/ elt_bits
;
3986 for (unsigned int i
= 0; i
< nelts
; i
+= elts_per_int
)
3988 unsigned HOST_WIDE_INT value
= 0;
3989 unsigned int limit
= MIN (nelts
- i
, elts_per_int
);
3990 for (unsigned int j
= 0; j
< limit
; ++j
)
3991 if (INTVAL (CONST_VECTOR_ELT (x
, i
+ j
)) != 0)
3992 value
|= 1 << (j
* elt_bits
);
3993 output_constant_pool_2 (int_mode
, gen_int_mode (value
, int_mode
),
3994 i
!= 0 ? MIN (align
, int_bits
) : align
);
3998 case MODE_VECTOR_FLOAT
:
3999 case MODE_VECTOR_INT
:
4000 case MODE_VECTOR_FRACT
:
4001 case MODE_VECTOR_UFRACT
:
4002 case MODE_VECTOR_ACCUM
:
4003 case MODE_VECTOR_UACCUM
:
4006 scalar_mode submode
= GET_MODE_INNER (mode
);
4007 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
4009 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
4010 units
= GET_MODE_NUNITS (mode
);
4012 for (i
= 0; i
< units
; i
++)
4014 rtx elt
= CONST_VECTOR_ELT (x
, i
);
4015 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
4025 /* Worker function for output_constant_pool. Emit constant DESC,
4026 giving it ALIGN bits of alignment. */
4029 output_constant_pool_1 (class constant_descriptor_rtx
*desc
,
4036 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
4037 whose CODE_LABEL has been deleted. This can occur if a jump table
4038 is eliminated by optimization. If so, write a constant of zero
4039 instead. Note that this can also happen by turning the
4040 CODE_LABEL into a NOTE. */
4041 /* ??? This seems completely and utterly wrong. Certainly it's
4042 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
4043 functioning even with rtx_insn::deleted and friends. */
4046 switch (GET_CODE (tmp
))
4049 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
4050 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
4052 tmp
= XEXP (XEXP (tmp
, 0), 0);
4057 rtx_insn
*insn
= label_ref_label (tmp
);
4058 gcc_assert (!insn
->deleted ());
4059 gcc_assert (!NOTE_P (insn
)
4060 || NOTE_KIND (insn
) != NOTE_INSN_DELETED
);
4068 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
4069 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
4070 align
, desc
->labelno
, done
);
4073 assemble_align (align
);
4075 /* Output the label. */
4076 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
4079 Pass actual alignment value while emitting string constant to asm code
4080 as function 'output_constant_pool_1' explicitly passes the alignment as 1
4081 assuming that the data is already aligned which prevents the generation
4082 of fix-up table entries. */
4083 output_constant_pool_2 (desc
->mode
, x
, desc
->align
);
4085 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
4086 sections have proper size. */
4087 if (align
> GET_MODE_BITSIZE (desc
->mode
)
4089 && (in_section
->common
.flags
& SECTION_MERGE
))
4090 assemble_align (align
);
4092 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
4098 /* Recompute the offsets of entries in POOL, and the overall size of
4099 POOL. Do this after calling mark_constant_pool to ensure that we
4100 are computing the offset values for the pool which we will actually
4104 recompute_pool_offsets (struct rtx_constant_pool
*pool
)
4106 class constant_descriptor_rtx
*desc
;
4109 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
4112 /* Recalculate offset. */
4113 unsigned int align
= desc
->align
;
4114 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
4115 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
4116 desc
->offset
= pool
->offset
;
4117 pool
->offset
+= GET_MODE_SIZE (desc
->mode
);
4121 /* Mark all constants that are referenced by SYMBOL_REFs in X.
4122 Emit referenced deferred strings. */
4125 mark_constants_in_pattern (rtx insn
)
4127 subrtx_iterator::array_type array
;
4128 FOR_EACH_SUBRTX (iter
, array
, PATTERN (insn
), ALL
)
4130 const_rtx x
= *iter
;
4131 if (GET_CODE (x
) == SYMBOL_REF
)
4133 if (CONSTANT_POOL_ADDRESS_P (x
))
4135 class constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
4136 if (desc
->mark
== 0)
4139 iter
.substitute (desc
->constant
);
4142 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
4144 tree decl
= SYMBOL_REF_DECL (x
);
4145 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
4147 n_deferred_constants
--;
4148 output_constant_def_contents (CONST_CAST_RTX (x
));
4155 /* Look through appropriate parts of INSN, marking all entries in the
4156 constant pool which are actually being used. Entries that are only
4157 referenced by other constants are also marked as used. Emit
4158 deferred strings that are used. */
4161 mark_constants (rtx_insn
*insn
)
4166 /* Insns may appear inside a SEQUENCE. Only check the patterns of
4167 insns, not any notes that may be attached. We don't want to mark
4168 a constant just because it happens to appear in a REG_EQUIV note. */
4169 if (rtx_sequence
*seq
= dyn_cast
<rtx_sequence
*> (PATTERN (insn
)))
4171 int i
, n
= seq
->len ();
4172 for (i
= 0; i
< n
; ++i
)
4174 rtx subinsn
= seq
->element (i
);
4175 if (INSN_P (subinsn
))
4176 mark_constants_in_pattern (subinsn
);
4180 mark_constants_in_pattern (insn
);
4183 /* Look through the instructions for this function, and mark all the
4184 entries in POOL which are actually being used. Emit deferred constants
4185 which have indeed been used. */
4188 mark_constant_pool (void)
4192 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
4195 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
4196 mark_constants (insn
);
4199 /* Write all the constants in POOL. */
4202 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
4204 class constant_descriptor_rtx
*desc
;
4206 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
4209 #ifdef ASM_OUTPUT_DEF
4210 const char *name
= targetm
.strip_name_encoding (XSTR (desc
->sym
, 0));
4212 char buffer
[256 + 32];
4215 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", ~desc
->mark
);
4216 p
= targetm
.strip_name_encoding (label
);
4219 sprintf (buffer
, "%s+%ld", p
, (long) (desc
->offset
));
4222 ASM_OUTPUT_DEF (asm_out_file
, name
, p
);
4227 else if (desc
->mark
)
4229 /* If the constant is part of an object_block, make sure that
4230 the constant has been positioned within its block, but do not
4231 write out its definition yet. output_object_blocks will do
4233 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
4234 && SYMBOL_REF_BLOCK (desc
->sym
))
4235 place_block_symbol (desc
->sym
);
4238 switch_to_section (targetm
.asm_out
.select_rtx_section
4239 (desc
->mode
, desc
->constant
, desc
->align
));
4240 output_constant_pool_1 (desc
, desc
->align
);
4245 struct constant_descriptor_rtx_data
{
4246 constant_descriptor_rtx
*desc
;
4248 unsigned short size
;
4249 unsigned short offset
;
4253 /* qsort callback to sort constant_descriptor_rtx_data * vector by
4257 constant_descriptor_rtx_data_cmp (const void *p1
, const void *p2
)
4259 constant_descriptor_rtx_data
*const data1
4260 = *(constant_descriptor_rtx_data
* const *) p1
;
4261 constant_descriptor_rtx_data
*const data2
4262 = *(constant_descriptor_rtx_data
* const *) p2
;
4263 if (data1
->size
> data2
->size
)
4265 if (data1
->size
< data2
->size
)
4267 if (data1
->hash
< data2
->hash
)
4269 gcc_assert (data1
->hash
> data2
->hash
);
4273 struct const_rtx_data_hasher
: nofree_ptr_hash
<constant_descriptor_rtx_data
>
4275 static hashval_t
hash (constant_descriptor_rtx_data
*);
4276 static bool equal (constant_descriptor_rtx_data
*,
4277 constant_descriptor_rtx_data
*);
4280 /* Hash and compare functions for const_rtx_data_htab. */
4283 const_rtx_data_hasher::hash (constant_descriptor_rtx_data
*data
)
4289 const_rtx_data_hasher::equal (constant_descriptor_rtx_data
*x
,
4290 constant_descriptor_rtx_data
*y
)
4292 if (x
->hash
!= y
->hash
|| x
->size
!= y
->size
)
4294 unsigned int align1
= x
->desc
->align
;
4295 unsigned int align2
= y
->desc
->align
;
4296 unsigned int offset1
= (x
->offset
* BITS_PER_UNIT
) & (align1
- 1);
4297 unsigned int offset2
= (y
->offset
* BITS_PER_UNIT
) & (align2
- 1);
4299 align1
= least_bit_hwi (offset1
);
4301 align2
= least_bit_hwi (offset2
);
4302 if (align2
> align1
)
4304 if (memcmp (x
->bytes
, y
->bytes
, x
->size
* sizeof (target_unit
)) != 0)
4309 /* Attempt to optimize constant pool POOL. If it contains both CONST_VECTOR
4310 constants and scalar constants with the values of CONST_VECTOR elements,
4311 try to alias the scalar constants with the CONST_VECTOR elements. */
4314 optimize_constant_pool (struct rtx_constant_pool
*pool
)
4316 auto_vec
<target_unit
, 128> buffer
;
4317 auto_vec
<constant_descriptor_rtx_data
*, 128> vec
;
4318 object_allocator
<constant_descriptor_rtx_data
>
4319 data_pool ("constant_descriptor_rtx_data_pool");
4322 for (constant_descriptor_rtx
*desc
= pool
->first
; desc
; desc
= desc
->next
)
4324 && ! (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
4325 && SYMBOL_REF_BLOCK (desc
->sym
)))
4327 buffer
.truncate (0);
4328 buffer
.reserve (GET_MODE_SIZE (desc
->mode
));
4329 if (native_encode_rtx (desc
->mode
, desc
->constant
, buffer
, 0,
4330 GET_MODE_SIZE (desc
->mode
)))
4332 constant_descriptor_rtx_data
*data
= data_pool
.allocate ();
4335 data
->size
= GET_MODE_SIZE (desc
->mode
);
4339 vec
.safe_push (data
);
4344 vec
.qsort (constant_descriptor_rtx_data_cmp
);
4345 unsigned min_size
= vec
.last ()->size
;
4346 target_unit
*bytes
= XNEWVEC (target_unit
, size
);
4348 constant_descriptor_rtx_data
*data
;
4349 hash_table
<const_rtx_data_hasher
> * htab
4350 = new hash_table
<const_rtx_data_hasher
> (31);
4352 FOR_EACH_VEC_ELT (vec
, i
, data
)
4354 buffer
.truncate (0);
4355 native_encode_rtx (data
->desc
->mode
, data
->desc
->constant
,
4356 buffer
, 0, data
->size
);
4357 memcpy (bytes
+ size
, buffer
.address (), data
->size
);
4358 data
->bytes
= bytes
+ size
;
4359 data
->hash
= iterative_hash (data
->bytes
,
4360 data
->size
* sizeof (target_unit
), 0);
4362 constant_descriptor_rtx_data
**slot
4363 = htab
->find_slot_with_hash (data
, data
->hash
, INSERT
);
4366 data
->desc
->mark
= ~(*slot
)->desc
->labelno
;
4367 data
->desc
->offset
= (*slot
)->offset
;
4371 unsigned int sz
= 1 << floor_log2 (data
->size
);
4374 for (sz
>>= 1; sz
>= min_size
; sz
>>= 1)
4375 for (unsigned off
= 0; off
+ sz
<= data
->size
; off
+= sz
)
4377 constant_descriptor_rtx_data tmp
;
4378 tmp
.desc
= data
->desc
;
4379 tmp
.bytes
= data
->bytes
+ off
;
4382 tmp
.hash
= iterative_hash (tmp
.bytes
,
4383 sz
* sizeof (target_unit
), 0);
4384 slot
= htab
->find_slot_with_hash (&tmp
, tmp
.hash
, INSERT
);
4387 *slot
= data_pool
.allocate ();
4396 data_pool
.release ();
4399 /* Mark all constants that are used in the current function, then write
4400 out the function's private constant pool. */
4403 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
4404 tree fndecl ATTRIBUTE_UNUSED
)
4406 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
4408 /* It is possible for gcc to call force_const_mem and then to later
4409 discard the instructions which refer to the constant. In such a
4410 case we do not need to output the constant. */
4411 mark_constant_pool ();
4413 /* Having marked the constant pool entries we'll actually emit, we
4414 now need to rebuild the offset information, which may have become
4416 recompute_pool_offsets (pool
);
4418 #ifdef ASM_OUTPUT_POOL_PROLOGUE
4419 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4422 output_constant_pool_contents (pool
);
4424 #ifdef ASM_OUTPUT_POOL_EPILOGUE
4425 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4429 /* Write the contents of the shared constant pool. */
4432 output_shared_constant_pool (void)
4435 && TARGET_SUPPORTS_ALIASES
)
4436 optimize_constant_pool (shared_constant_pool
);
4438 output_constant_pool_contents (shared_constant_pool
);
4441 /* Determine what kind of relocations EXP may need. */
4444 compute_reloc_for_constant (tree exp
)
4446 int reloc
= 0, reloc2
;
4449 switch (TREE_CODE (exp
))
4453 /* Go inside any operations that get_inner_reference can handle and see
4454 if what's inside is a constant: no need to do anything here for
4455 addresses of variables or functions. */
4456 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4457 tem
= TREE_OPERAND (tem
, 0))
4460 if (TREE_CODE (tem
) == MEM_REF
4461 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
4463 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
4467 if (!targetm
.binds_local_p (tem
))
4474 case POINTER_PLUS_EXPR
:
4475 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4476 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4480 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4481 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4482 /* The difference of two local labels is computable at link time. */
4483 if (reloc
== 1 && reloc2
== 1)
4490 case VIEW_CONVERT_EXPR
:
4491 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4496 unsigned HOST_WIDE_INT idx
;
4497 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4499 reloc
|= compute_reloc_for_constant (tem
);
4509 /* Find all the constants whose addresses are referenced inside of EXP,
4510 and make sure assembler code with a label has been output for each one.
4511 Indicate whether an ADDR_EXPR has been encountered. */
4514 output_addressed_constants (tree exp
, int defer
)
4518 switch (TREE_CODE (exp
))
4522 /* Go inside any operations that get_inner_reference can handle and see
4523 if what's inside is a constant: no need to do anything here for
4524 addresses of variables or functions. */
4525 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4526 tem
= TREE_OPERAND (tem
, 0))
4529 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4530 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4531 tem
= DECL_INITIAL (tem
);
4533 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4534 output_constant_def (tem
, defer
);
4536 if (TREE_CODE (tem
) == MEM_REF
)
4537 output_addressed_constants (TREE_OPERAND (tem
, 0), defer
);
4541 case POINTER_PLUS_EXPR
:
4543 output_addressed_constants (TREE_OPERAND (exp
, 1), defer
);
4547 case VIEW_CONVERT_EXPR
:
4548 output_addressed_constants (TREE_OPERAND (exp
, 0), defer
);
4553 unsigned HOST_WIDE_INT idx
;
4554 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4556 output_addressed_constants (tem
, defer
);
4565 /* Whether a constructor CTOR is a valid static constant initializer if all
4566 its elements are. This used to be internal to initializer_constant_valid_p
4567 and has been exposed to let other functions like categorize_ctor_elements
4568 evaluate the property while walking a constructor for other purposes. */
4571 constructor_static_from_elts_p (const_tree ctor
)
4573 return (TREE_CONSTANT (ctor
)
4574 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4575 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4576 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4579 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4582 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4583 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4584 which are valid when ENDTYPE is an integer of any size; in
4585 particular, this does not accept a pointer minus a constant. This
4586 returns null_pointer_node if the VALUE is an absolute constant
4587 which can be used to initialize a static variable. Otherwise it
4591 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4595 if (!INTEGRAL_TYPE_P (endtype
))
4598 op0
= TREE_OPERAND (value
, 0);
4599 op1
= TREE_OPERAND (value
, 1);
4601 /* Like STRIP_NOPS except allow the operand mode to widen. This
4602 works around a feature of fold that simplifies (int)(p1 - p2) to
4603 ((int)p1 - (int)p2) under the theory that the narrower operation
4606 while (CONVERT_EXPR_P (op0
)
4607 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4609 tree inner
= TREE_OPERAND (op0
, 0);
4610 if (inner
== error_mark_node
4611 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4612 || (GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (op0
)))
4613 > GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (inner
)))))
4618 while (CONVERT_EXPR_P (op1
)
4619 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4621 tree inner
= TREE_OPERAND (op1
, 0);
4622 if (inner
== error_mark_node
4623 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4624 || (GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (op1
)))
4625 > GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (inner
)))))
4630 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4634 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4635 cache
? cache
+ 2 : NULL
);
4636 /* Both initializers must be known. */
4640 && (op0
== null_pointer_node
4641 || TREE_CODE (value
) == MINUS_EXPR
))
4642 return null_pointer_node
;
4644 /* Support differences between labels. */
4645 if (TREE_CODE (op0
) == LABEL_DECL
4646 && TREE_CODE (op1
) == LABEL_DECL
)
4647 return null_pointer_node
;
4649 if (TREE_CODE (op0
) == STRING_CST
4650 && TREE_CODE (op1
) == STRING_CST
4651 && operand_equal_p (op0
, op1
, 1))
4652 return null_pointer_node
;
4658 /* Helper function of initializer_constant_valid_p.
4659 Return nonzero if VALUE is a valid constant-valued expression
4660 for use in initializing a static variable; one that can be an
4661 element of a "constant" initializer.
4663 Return null_pointer_node if the value is absolute;
4664 if it is relocatable, return the variable that determines the relocation.
4665 We assume that VALUE has been folded as much as possible;
4666 therefore, we do not need to check for such things as
4667 arithmetic-combinations of integers.
4669 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4672 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4676 switch (TREE_CODE (value
))
4679 if (constructor_static_from_elts_p (value
))
4681 unsigned HOST_WIDE_INT idx
;
4683 bool absolute
= true;
4685 if (cache
&& cache
[0] == value
)
4687 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4690 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4693 /* An absolute value is required with reverse SSO. */
4694 || (reloc
!= null_pointer_node
4695 && TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (value
))
4696 && !AGGREGATE_TYPE_P (TREE_TYPE (elt
))))
4701 cache
[1] = NULL_TREE
;
4705 if (reloc
!= null_pointer_node
)
4708 /* For a non-absolute relocation, there is no single
4709 variable that can be "the variable that determines the
4714 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4716 return absolute
? null_pointer_node
: error_mark_node
;
4719 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4727 return null_pointer_node
;
4732 tree op0
= staticp (TREE_OPERAND (value
, 0));
4735 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4736 to be a constant, this is old-skool offsetof-like nonsense. */
4737 if (TREE_CODE (op0
) == INDIRECT_REF
4738 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4739 return null_pointer_node
;
4740 /* Taking the address of a nested function involves a trampoline,
4741 unless we don't need or want one. */
4742 if (TREE_CODE (op0
) == FUNCTION_DECL
4743 && DECL_STATIC_CHAIN (op0
)
4744 && !TREE_NO_TRAMPOLINE (value
))
4746 /* "&{...}" requires a temporary to hold the constructed
4748 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4754 case NON_LVALUE_EXPR
:
4755 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4758 case VIEW_CONVERT_EXPR
:
4760 tree src
= TREE_OPERAND (value
, 0);
4761 tree src_type
= TREE_TYPE (src
);
4762 tree dest_type
= TREE_TYPE (value
);
4764 /* Allow view-conversions from aggregate to non-aggregate type only
4765 if the bit pattern is fully preserved afterwards; otherwise, the
4766 RTL expander won't be able to apply a subsequent transformation
4767 to the underlying constructor. */
4768 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4770 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4771 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4776 /* Allow all other kinds of view-conversion. */
4777 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4782 tree src
= TREE_OPERAND (value
, 0);
4783 tree src_type
= TREE_TYPE (src
);
4784 tree dest_type
= TREE_TYPE (value
);
4786 /* Allow conversions between pointer types, floating-point
4787 types, and offset types. */
4788 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4789 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4790 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4791 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4792 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4794 /* Allow length-preserving conversions between integer types. */
4795 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4796 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4797 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4799 /* Allow conversions between other integer types only if
4800 explicit value. Don't allow sign-extension to a type larger
4801 than word and pointer, there aren't relocations that would
4802 allow to sign extend it to a wider type. */
4803 if (INTEGRAL_TYPE_P (dest_type
)
4804 && INTEGRAL_TYPE_P (src_type
)
4805 && (TYPE_UNSIGNED (src_type
)
4806 || TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
)
4807 || TYPE_PRECISION (dest_type
) <= BITS_PER_WORD
4808 || TYPE_PRECISION (dest_type
) <= POINTER_SIZE
))
4810 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4811 if (inner
== null_pointer_node
)
4812 return null_pointer_node
;
4816 /* Allow (int) &foo provided int is as wide as a pointer. */
4817 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4818 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4819 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4821 /* Likewise conversions from int to pointers, but also allow
4822 conversions from 0. */
4823 if ((POINTER_TYPE_P (dest_type
)
4824 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4825 && INTEGRAL_TYPE_P (src_type
))
4827 if (TREE_CODE (src
) == INTEGER_CST
4828 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4829 return null_pointer_node
;
4830 if (integer_zerop (src
))
4831 return null_pointer_node
;
4832 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4833 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4836 /* Allow conversions to struct or union types if the value
4838 if (TREE_CODE (dest_type
) == RECORD_TYPE
4839 || TREE_CODE (dest_type
) == UNION_TYPE
)
4840 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4844 case POINTER_PLUS_EXPR
:
4846 /* Any valid floating-point constants will have been folded by now;
4847 with -frounding-math we hit this with addition of two constants. */
4848 if (TREE_CODE (endtype
) == REAL_TYPE
)
4850 if (cache
&& cache
[0] == value
)
4852 if (! INTEGRAL_TYPE_P (endtype
)
4853 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4855 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4857 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4860 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4861 endtype
, ncache
+ 2);
4862 /* If either term is absolute, use the other term's relocation. */
4863 if (valid0
== null_pointer_node
)
4865 else if (valid1
== null_pointer_node
)
4867 /* Support narrowing pointer differences. */
4869 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4873 /* Support narrowing pointer differences. */
4874 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4882 case POINTER_DIFF_EXPR
:
4884 if (TREE_CODE (endtype
) == REAL_TYPE
)
4886 if (cache
&& cache
[0] == value
)
4888 if (! INTEGRAL_TYPE_P (endtype
)
4889 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4891 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4893 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4896 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4897 endtype
, ncache
+ 2);
4898 /* Win if second argument is absolute. */
4899 if (valid1
== null_pointer_node
)
4901 /* Win if both arguments have the same relocation.
4902 Then the value is absolute. */
4903 else if (valid0
== valid1
&& valid0
!= 0)
4904 ret
= null_pointer_node
;
4905 /* Since GCC guarantees that string constants are unique in the
4906 generated code, a subtraction between two copies of the same
4907 constant string is absolute. */
4908 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4909 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4910 && operand_equal_p (valid0
, valid1
, 1))
4911 ret
= null_pointer_node
;
4912 /* Support narrowing differences. */
4914 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4918 /* Support narrowing differences. */
4919 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4934 /* Return nonzero if VALUE is a valid constant-valued expression
4935 for use in initializing a static variable; one that can be an
4936 element of a "constant" initializer.
4938 Return null_pointer_node if the value is absolute;
4939 if it is relocatable, return the variable that determines the relocation.
4940 We assume that VALUE has been folded as much as possible;
4941 therefore, we do not need to check for such things as
4942 arithmetic-combinations of integers. */
4944 initializer_constant_valid_p (tree value
, tree endtype
, bool reverse
)
4946 tree reloc
= initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4948 /* An absolute value is required with reverse storage order. */
4950 && reloc
!= null_pointer_node
4952 && !AGGREGATE_TYPE_P (endtype
)
4953 && !VECTOR_TYPE_P (endtype
))
4959 /* Return true if VALUE is a valid constant-valued expression
4960 for use in initializing a static bit-field; one that can be
4961 an element of a "constant" initializer. */
4964 initializer_constant_valid_for_bitfield_p (tree value
)
4966 /* For bitfields we support integer constants or possibly nested aggregates
4968 switch (TREE_CODE (value
))
4972 unsigned HOST_WIDE_INT idx
;
4975 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4976 if (!initializer_constant_valid_for_bitfield_p (elt
))
4985 case VIEW_CONVERT_EXPR
:
4986 case NON_LVALUE_EXPR
:
4988 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4997 /* Check if a STRING_CST fits into the field.
4998 Tolerate only the case when the NUL termination
4999 does not fit into the field. */
5002 check_string_literal (tree string
, unsigned HOST_WIDE_INT size
)
5004 tree type
= TREE_TYPE (string
);
5005 tree eltype
= TREE_TYPE (type
);
5006 unsigned HOST_WIDE_INT elts
= tree_to_uhwi (TYPE_SIZE_UNIT (eltype
));
5007 unsigned HOST_WIDE_INT mem_size
= tree_to_uhwi (TYPE_SIZE_UNIT (type
));
5008 int len
= TREE_STRING_LENGTH (string
);
5010 if (elts
!= 1 && elts
!= 2 && elts
!= 4)
5012 if (len
< 0 || len
% elts
!= 0)
5014 if (size
< (unsigned)len
)
5016 if (mem_size
!= size
)
5021 /* output_constructor outer state of relevance in recursive calls, typically
5022 for nested aggregate bitfields. */
5024 struct oc_outer_state
{
5025 unsigned int bit_offset
; /* current position in ... */
5026 int byte
; /* ... the outer byte buffer. */
5029 static unsigned HOST_WIDE_INT
5030 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int, bool,
5033 /* Output assembler code for constant EXP, with no label.
5034 This includes the pseudo-op such as ".int" or ".byte", and a newline.
5035 Assumes output_addressed_constants has been done on EXP already.
5037 Generate at least SIZE bytes of assembler data, padding at the end
5038 with zeros if necessary. SIZE must always be specified. The returned
5039 value is the actual number of bytes of assembler data generated, which
5040 may be bigger than SIZE if the object contains a variable length field.
5042 SIZE is important for structure constructors,
5043 since trailing members may have been omitted from the constructor.
5044 It is also important for initialization of arrays from string constants
5045 since the full length of the string constant might not be wanted.
5046 It is also needed for initialization of unions, where the initializer's
5047 type is just one member, and that may not be as long as the union.
5049 There a case in which we would fail to output exactly SIZE bytes:
5050 for a structure constructor that wants to produce more than SIZE bytes.
5051 But such constructors will never be generated for any possible input.
5053 ALIGN is the alignment of the data in bits.
5055 If REVERSE is true, EXP is output in reverse storage order. */
5057 static unsigned HOST_WIDE_INT
5058 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
,
5059 bool reverse
, bool merge_strings
)
5061 enum tree_code code
;
5062 unsigned HOST_WIDE_INT thissize
;
5065 if (size
== 0 || flag_syntax_only
)
5068 /* See if we're trying to initialize a pointer in a non-default mode
5069 to the address of some declaration somewhere. If the target says
5070 the mode is valid for pointers, assume the target has a way of
5072 if (TREE_CODE (exp
) == NOP_EXPR
5073 && POINTER_TYPE_P (TREE_TYPE (exp
))
5074 && targetm
.addr_space
.valid_pointer_mode
5075 (SCALAR_INT_TYPE_MODE (TREE_TYPE (exp
)),
5076 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
5078 tree saved_type
= TREE_TYPE (exp
);
5080 /* Peel off any intermediate conversions-to-pointer for valid
5082 while (TREE_CODE (exp
) == NOP_EXPR
5083 && POINTER_TYPE_P (TREE_TYPE (exp
))
5084 && targetm
.addr_space
.valid_pointer_mode
5085 (SCALAR_INT_TYPE_MODE (TREE_TYPE (exp
)),
5086 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
5087 exp
= TREE_OPERAND (exp
, 0);
5089 /* If what we're left with is the address of something, we can
5090 convert the address to the final type and output it that
5092 if (TREE_CODE (exp
) == ADDR_EXPR
)
5093 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
5094 /* Likewise for constant ints. */
5095 else if (TREE_CODE (exp
) == INTEGER_CST
)
5096 exp
= fold_convert (saved_type
, exp
);
5100 /* Eliminate any conversions since we'll be outputting the underlying
5102 while (CONVERT_EXPR_P (exp
)
5103 || TREE_CODE (exp
) == NON_LVALUE_EXPR
5104 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
5106 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
5107 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
5109 /* Make sure eliminating the conversion is really a no-op, except with
5110 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
5111 union types to allow for Ada unchecked unions. */
5112 if (type_size
> op_size
5113 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
5114 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
5115 /* Keep the conversion. */
5118 exp
= TREE_OPERAND (exp
, 0);
5121 code
= TREE_CODE (TREE_TYPE (exp
));
5122 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
5124 /* Allow a constructor with no elements for any data type.
5125 This means to fill the space with zeros. */
5126 if (TREE_CODE (exp
) == CONSTRUCTOR
5127 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
5129 assemble_zeros (size
);
5133 if (TREE_CODE (exp
) == FDESC_EXPR
)
5135 #ifdef ASM_OUTPUT_FDESC
5136 HOST_WIDE_INT part
= tree_to_shwi (TREE_OPERAND (exp
, 1));
5137 tree decl
= TREE_OPERAND (exp
, 0);
5138 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
5145 /* Now output the underlying data. If we've handling the padding, return.
5146 Otherwise, break and ensure SIZE is the size written. */
5153 case REFERENCE_TYPE
:
5155 case FIXED_POINT_TYPE
:
5157 cst
= expand_expr (exp
, NULL_RTX
, VOIDmode
, EXPAND_INITIALIZER
);
5159 cst
= flip_storage_order (TYPE_MODE (TREE_TYPE (exp
)), cst
);
5160 if (!assemble_integer (cst
, MIN (size
, thissize
), align
, 0))
5161 error ("initializer for integer/fixed-point value is too complicated");
5165 if (TREE_CODE (exp
) != REAL_CST
)
5166 error ("initializer for floating value is not a floating constant");
5168 assemble_real (TREE_REAL_CST (exp
),
5169 SCALAR_FLOAT_TYPE_MODE (TREE_TYPE (exp
)),
5174 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
,
5176 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
5177 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)),
5183 switch (TREE_CODE (exp
))
5186 return output_constructor (exp
, size
, align
, reverse
, NULL
);
5188 thissize
= (unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
);
5191 || TREE_STRING_POINTER (exp
) [thissize
- 1] != '\0'))
5193 gcc_checking_assert (check_string_literal (exp
, size
));
5194 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
5198 scalar_mode inner
= SCALAR_TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
5199 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
5200 int elt_size
= GET_MODE_SIZE (inner
);
5201 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
,
5203 thissize
= elt_size
;
5204 /* Static constants must have a fixed size. */
5205 unsigned int nunits
= VECTOR_CST_NELTS (exp
).to_constant ();
5206 for (unsigned int i
= 1; i
< nunits
; i
++)
5208 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
,
5210 thissize
+= elt_size
;
5221 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
5222 return output_constructor (exp
, size
, align
, reverse
, NULL
);
5231 if (size
> thissize
)
5232 assemble_zeros (size
- thissize
);
5237 /* Subroutine of output_constructor, used for computing the size of
5238 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
5239 type with an unspecified upper bound. */
5241 static unsigned HOST_WIDE_INT
5242 array_size_for_constructor (tree val
)
5245 unsigned HOST_WIDE_INT cnt
;
5246 tree index
, value
, tmp
;
5249 /* This code used to attempt to handle string constants that are not
5250 arrays of single-bytes, but nothing else does, so there's no point in
5252 if (TREE_CODE (val
) == STRING_CST
)
5253 return TREE_STRING_LENGTH (val
);
5255 max_index
= NULL_TREE
;
5256 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
5258 if (TREE_CODE (index
) == RANGE_EXPR
)
5259 index
= TREE_OPERAND (index
, 1);
5260 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
5264 if (max_index
== NULL_TREE
)
5267 /* Compute the total number of array elements. */
5268 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
5269 i
= wi::to_offset (max_index
) - wi::to_offset (tmp
) + 1;
5271 /* Multiply by the array element unit size to find number of bytes. */
5272 i
*= wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
5274 gcc_assert (wi::fits_uhwi_p (i
));
5275 return i
.to_uhwi ();
5278 /* Other datastructures + helpers for output_constructor. */
5280 /* output_constructor local state to support interaction with helpers. */
5282 struct oc_local_state
{
5284 /* Received arguments. */
5285 tree exp
; /* Constructor expression. */
5286 tree type
; /* Type of constructor expression. */
5287 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
5288 unsigned int align
; /* Known initial alignment. */
5289 tree min_index
; /* Lower bound if specified for an array. */
5291 /* Output processing state. */
5292 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
5293 int byte
; /* Part of a bitfield byte yet to be output. */
5294 int last_relative_index
; /* Implicit or explicit index of the last
5295 array element output within a bitfield. */
5296 bool byte_buffer_in_use
; /* Whether BYTE is in use. */
5297 bool reverse
; /* Whether reverse storage order is in use. */
5299 /* Current element. */
5300 tree field
; /* Current field decl in a record. */
5301 tree val
; /* Current element value. */
5302 tree index
; /* Current element index. */
5306 /* Helper for output_constructor. From the current LOCAL state, output a
5307 RANGE_EXPR element. */
5310 output_constructor_array_range (oc_local_state
*local
)
5312 /* Perform the index calculation in modulo arithmetic but
5313 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
5314 but we are using an unsigned sizetype. */
5315 unsigned prec
= TYPE_PRECISION (sizetype
);
5316 offset_int idx
= wi::sext (wi::to_offset (TREE_OPERAND (local
->index
, 0))
5317 - wi::to_offset (local
->min_index
), prec
);
5318 tree valtype
= TREE_TYPE (local
->val
);
5319 HOST_WIDE_INT fieldpos
5320 = (idx
* wi::to_offset (TYPE_SIZE_UNIT (valtype
))).to_short_addr ();
5322 /* Advance to offset of this element. */
5323 if (fieldpos
> local
->total_bytes
)
5325 assemble_zeros (fieldpos
- local
->total_bytes
);
5326 local
->total_bytes
= fieldpos
;
5329 /* Must not go backwards. */
5330 gcc_assert (fieldpos
== local
->total_bytes
);
5332 unsigned HOST_WIDE_INT fieldsize
5333 = int_size_in_bytes (TREE_TYPE (local
->type
));
5335 HOST_WIDE_INT lo_index
5336 = tree_to_shwi (TREE_OPERAND (local
->index
, 0));
5337 HOST_WIDE_INT hi_index
5338 = tree_to_shwi (TREE_OPERAND (local
->index
, 1));
5339 HOST_WIDE_INT index
;
5342 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
5344 for (index
= lo_index
; index
<= hi_index
; index
++)
5346 /* Output the element's initial value. */
5347 if (local
->val
== NULL_TREE
)
5348 assemble_zeros (fieldsize
);
5350 fieldsize
= output_constant (local
->val
, fieldsize
, align2
,
5351 local
->reverse
, false);
5353 /* Count its size. */
5354 local
->total_bytes
+= fieldsize
;
5358 /* Helper for output_constructor. From the current LOCAL state, output a
5359 field element that is not true bitfield or part of an outer one. */
5362 output_constructor_regular_field (oc_local_state
*local
)
5364 /* Field size and position. Since this structure is static, we know the
5365 positions are constant. */
5366 unsigned HOST_WIDE_INT fieldsize
;
5367 HOST_WIDE_INT fieldpos
;
5369 unsigned int align2
;
5371 /* Output any buffered-up bit-fields preceding this element. */
5372 if (local
->byte_buffer_in_use
)
5374 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5375 local
->total_bytes
++;
5376 local
->byte_buffer_in_use
= false;
5379 if (local
->index
!= NULL_TREE
)
5381 /* Perform the index calculation in modulo arithmetic but
5382 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
5383 but we are using an unsigned sizetype. */
5384 unsigned prec
= TYPE_PRECISION (sizetype
);
5385 offset_int idx
= wi::sext (wi::to_offset (local
->index
)
5386 - wi::to_offset (local
->min_index
), prec
);
5387 fieldpos
= (idx
* wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
))))
5390 else if (local
->field
!= NULL_TREE
)
5391 fieldpos
= int_byte_position (local
->field
);
5395 /* Advance to offset of this element.
5396 Note no alignment needed in an array, since that is guaranteed
5397 if each element has the proper size. */
5398 if (local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
5400 if (fieldpos
> local
->total_bytes
)
5402 assemble_zeros (fieldpos
- local
->total_bytes
);
5403 local
->total_bytes
= fieldpos
;
5406 /* Must not go backwards. */
5407 gcc_assert (fieldpos
== local
->total_bytes
);
5410 /* Find the alignment of this element. */
5411 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
5413 /* Determine size this element should occupy. */
5418 /* If this is an array with an unspecified upper bound,
5419 the initializer determines the size. */
5420 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
5421 but we cannot do this until the deprecated support for
5422 initializing zero-length array members is removed. */
5423 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
5424 && (!TYPE_DOMAIN (TREE_TYPE (local
->field
))
5425 || !TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
)))))
5427 fieldsize
= array_size_for_constructor (local
->val
);
5428 /* Given a non-empty initialization, this field had better
5429 be last. Given a flexible array member, the next field
5430 on the chain is a TYPE_DECL of the enclosing struct. */
5431 const_tree next
= DECL_CHAIN (local
->field
);
5432 gcc_assert (!fieldsize
|| !next
|| TREE_CODE (next
) != FIELD_DECL
);
5433 tree size
= TYPE_SIZE_UNIT (TREE_TYPE (local
->val
));
5434 gcc_checking_assert (compare_tree_int (size
, fieldsize
) == 0);
5437 fieldsize
= tree_to_uhwi (DECL_SIZE_UNIT (local
->field
));
5440 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
5442 /* Output the element's initial value. */
5443 if (local
->val
== NULL_TREE
)
5444 assemble_zeros (fieldsize
);
5446 fieldsize
= output_constant (local
->val
, fieldsize
, align2
,
5447 local
->reverse
, false);
5449 /* Count its size. */
5450 local
->total_bytes
+= fieldsize
;
5453 /* Helper for output_constructor. From the LOCAL state, output an element
5454 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
5455 from the start of a possibly ongoing outer byte buffer. */
5458 output_constructor_bitfield (oc_local_state
*local
, unsigned int bit_offset
)
5460 /* Bit size of this element. */
5461 HOST_WIDE_INT ebitsize
5463 ? tree_to_uhwi (DECL_SIZE (local
->field
))
5464 : tree_to_uhwi (TYPE_SIZE (TREE_TYPE (local
->type
))));
5466 /* Relative index of this element if this is an array component. */
5467 HOST_WIDE_INT relative_index
5470 ? (tree_to_shwi (local
->index
)
5471 - tree_to_shwi (local
->min_index
))
5472 : local
->last_relative_index
+ 1)
5475 /* Bit position of this element from the start of the containing
5477 HOST_WIDE_INT constructor_relative_ebitpos
5479 ? int_bit_position (local
->field
)
5480 : ebitsize
* relative_index
);
5482 /* Bit position of this element from the start of a possibly ongoing
5483 outer byte buffer. */
5484 HOST_WIDE_INT byte_relative_ebitpos
5485 = bit_offset
+ constructor_relative_ebitpos
;
5487 /* From the start of a possibly ongoing outer byte buffer, offsets to
5488 the first bit of this element and to the first bit past the end of
5490 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
5491 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
5493 local
->last_relative_index
= relative_index
;
5495 if (local
->val
== NULL_TREE
)
5496 local
->val
= integer_zero_node
;
5498 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
5499 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
5500 local
->val
= TREE_OPERAND (local
->val
, 0);
5502 if (TREE_CODE (local
->val
) != INTEGER_CST
5503 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
5505 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
5509 /* If this field does not start in this (or next) byte, skip some bytes. */
5510 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5512 /* Output remnant of any bit field in previous bytes. */
5513 if (local
->byte_buffer_in_use
)
5515 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5516 local
->total_bytes
++;
5517 local
->byte_buffer_in_use
= false;
5520 /* If still not at proper byte, advance to there. */
5521 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5523 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
5524 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
5525 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
5529 /* Set up the buffer if necessary. */
5530 if (!local
->byte_buffer_in_use
)
5534 local
->byte_buffer_in_use
= true;
5537 /* If this is nested constructor, recurse passing the bit offset and the
5538 pending data, then retrieve the new pending data afterwards. */
5539 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
5541 oc_outer_state temp_state
;
5542 temp_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
5543 temp_state
.byte
= local
->byte
;
5545 += output_constructor (local
->val
, 0, 0, local
->reverse
, &temp_state
);
5546 local
->byte
= temp_state
.byte
;
5550 /* Otherwise, we must split the element into pieces that fall within
5551 separate bytes, and combine each byte with previous or following
5553 while (next_offset
< end_offset
)
5557 unsigned HOST_WIDE_INT value
;
5558 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
5559 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
5561 /* Advance from byte to byte within this element when necessary. */
5562 while (next_byte
!= local
->total_bytes
)
5564 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5565 local
->total_bytes
++;
5569 /* Number of bits we can process at once (all part of the same byte). */
5570 this_time
= MIN (end_offset
- next_offset
, BITS_PER_UNIT
- next_bit
);
5571 if (local
->reverse
? !BYTES_BIG_ENDIAN
: BYTES_BIG_ENDIAN
)
5573 /* For big-endian data, take the most significant bits (of the
5574 bits that are significant) first and put them into bytes from
5575 the most significant end. */
5576 shift
= end_offset
- next_offset
- this_time
;
5578 /* Don't try to take a bunch of bits that cross
5579 the word boundary in the INTEGER_CST. We can
5580 only select bits from one element. */
5581 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5582 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5584 const int end
= shift
+ this_time
- 1;
5585 shift
= end
& -HOST_BITS_PER_WIDE_INT
;
5586 this_time
= end
- shift
+ 1;
5589 /* Now get the bits we want to insert. */
5590 value
= wi::extract_uhwi (wi::to_widest (local
->val
),
5593 /* Get the result. This works only when:
5594 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5595 local
->byte
|= value
<< (BITS_PER_UNIT
- this_time
- next_bit
);
5599 /* On little-endian machines, take the least significant bits of
5600 the value first and pack them starting at the least significant
5601 bits of the bytes. */
5602 shift
= next_offset
- byte_relative_ebitpos
;
5604 /* Don't try to take a bunch of bits that cross
5605 the word boundary in the INTEGER_CST. We can
5606 only select bits from one element. */
5607 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5608 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5610 = HOST_BITS_PER_WIDE_INT
- (shift
& (HOST_BITS_PER_WIDE_INT
- 1));
5612 /* Now get the bits we want to insert. */
5613 value
= wi::extract_uhwi (wi::to_widest (local
->val
),
5616 /* Get the result. This works only when:
5617 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5618 local
->byte
|= value
<< next_bit
;
5621 next_offset
+= this_time
;
5622 local
->byte_buffer_in_use
= true;
5626 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5627 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5628 caller output state of relevance in recursive invocations. */
5630 static unsigned HOST_WIDE_INT
5631 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
,
5632 bool reverse
, oc_outer_state
*outer
)
5634 unsigned HOST_WIDE_INT cnt
;
5635 constructor_elt
*ce
;
5636 oc_local_state local
;
5638 /* Setup our local state to communicate with helpers. */
5640 local
.type
= TREE_TYPE (exp
);
5642 local
.align
= align
;
5643 if (TREE_CODE (local
.type
) == ARRAY_TYPE
&& TYPE_DOMAIN (local
.type
))
5644 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5646 local
.min_index
= integer_zero_node
;
5648 local
.total_bytes
= 0;
5649 local
.byte_buffer_in_use
= outer
!= NULL
;
5650 local
.byte
= outer
? outer
->byte
: 0;
5651 local
.last_relative_index
= -1;
5652 /* The storage order is specified for every aggregate type. */
5653 if (AGGREGATE_TYPE_P (local
.type
))
5654 local
.reverse
= TYPE_REVERSE_STORAGE_ORDER (local
.type
);
5656 local
.reverse
= reverse
;
5658 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5660 /* As CE goes through the elements of the constant, FIELD goes through the
5661 structure fields if the constant is a structure. If the constant is a
5662 union, we override this by getting the field from the TREE_LIST element.
5663 But the constant could also be an array. Then FIELD is zero.
5665 There is always a maximum of one element in the chain LINK for unions
5666 (even if the initializer in a source program incorrectly contains
5669 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5670 local
.field
= TYPE_FIELDS (local
.type
);
5672 local
.field
= NULL_TREE
;
5675 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5676 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5678 local
.val
= ce
->value
;
5679 local
.index
= NULL_TREE
;
5681 /* The element in a union constructor specifies the proper field
5683 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5684 local
.field
= ce
->index
;
5686 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5687 local
.index
= ce
->index
;
5689 if (local
.field
&& flag_verbose_asm
)
5690 fprintf (asm_out_file
, "%s %s:\n",
5692 DECL_NAME (local
.field
)
5693 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5696 /* Eliminate the marker that makes a cast not be an lvalue. */
5697 if (local
.val
!= NULL_TREE
)
5698 STRIP_NOPS (local
.val
);
5700 /* Output the current element, using the appropriate helper ... */
5702 /* For an array slice not part of an outer bitfield. */
5704 && local
.index
!= NULL_TREE
5705 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5706 output_constructor_array_range (&local
);
5708 /* For a field that is neither a true bitfield nor part of an outer one,
5709 known to be at least byte aligned and multiple-of-bytes long. */
5711 && (local
.field
== NULL_TREE
5712 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5713 output_constructor_regular_field (&local
);
5715 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5716 supported for scalar fields, so we may need to convert first. */
5719 if (TREE_CODE (local
.val
) == REAL_CST
)
5721 = fold_unary (VIEW_CONVERT_EXPR
,
5722 build_nonstandard_integer_type
5723 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5725 output_constructor_bitfield (&local
, outer
? outer
->bit_offset
: 0);
5729 /* If we are not at toplevel, save the pending data for our caller.
5730 Otherwise output the pending data and padding zeros as needed. */
5732 outer
->byte
= local
.byte
;
5735 if (local
.byte_buffer_in_use
)
5737 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5738 local
.total_bytes
++;
5741 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5743 assemble_zeros (local
.size
- local
.total_bytes
);
5744 local
.total_bytes
= local
.size
;
5748 return local
.total_bytes
;
5751 /* Mark DECL as weak. */
5754 mark_weak (tree decl
)
5756 if (DECL_WEAK (decl
))
5759 struct symtab_node
*n
= symtab_node::get (decl
);
5760 if (n
&& n
->refuse_visibility_changes
)
5761 error ("%+qD declared weak after being used", decl
);
5762 DECL_WEAK (decl
) = 1;
5764 if (DECL_RTL_SET_P (decl
)
5765 && MEM_P (DECL_RTL (decl
))
5766 && XEXP (DECL_RTL (decl
), 0)
5767 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5768 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5771 /* Merge weak status between NEWDECL and OLDDECL. */
5774 merge_weak (tree newdecl
, tree olddecl
)
5776 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5778 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5781 /* We put the NEWDECL on the weak_decls list at some point
5782 and OLDDECL as well. Keep just OLDDECL on the list. */
5783 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5784 if (TREE_VALUE (*pwd
) == newdecl
)
5786 *pwd
= TREE_CHAIN (*pwd
);
5793 if (DECL_WEAK (newdecl
))
5797 /* NEWDECL is weak, but OLDDECL is not. */
5799 /* If we already output the OLDDECL, we're in trouble; we can't
5800 go back and make it weak. This should never happen in
5801 unit-at-a-time compilation. */
5802 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5804 /* If we've already generated rtl referencing OLDDECL, we may
5805 have done so in a way that will not function properly with
5806 a weak symbol. Again in unit-at-a-time this should be
5808 gcc_assert (!TREE_USED (olddecl
)
5809 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5811 /* PR 49899: You cannot convert a static function into a weak, public function. */
5812 if (! TREE_PUBLIC (olddecl
) && TREE_PUBLIC (newdecl
))
5813 error ("weak declaration of %q+D being applied to a already "
5814 "existing, static definition", newdecl
);
5816 if (TARGET_SUPPORTS_WEAK
)
5818 /* We put the NEWDECL on the weak_decls list at some point.
5819 Replace it with the OLDDECL. */
5820 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5821 if (TREE_VALUE (wd
) == newdecl
)
5823 TREE_VALUE (wd
) = olddecl
;
5826 /* We may not find the entry on the list. If NEWDECL is a
5827 weak alias, then we will have already called
5828 globalize_decl to remove the entry; in that case, we do
5829 not need to do anything. */
5832 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5833 mark_weak (olddecl
);
5836 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5837 weak. Just update NEWDECL to indicate that it's weak too. */
5838 mark_weak (newdecl
);
5841 /* Declare DECL to be a weak symbol. */
5844 declare_weak (tree decl
)
5846 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5847 if (! TREE_PUBLIC (decl
))
5849 error ("weak declaration of %q+D must be public", decl
);
5852 else if (!TARGET_SUPPORTS_WEAK
)
5853 warning (0, "weak declaration of %q+D not supported", decl
);
5856 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5857 DECL_ATTRIBUTES (decl
)
5858 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5862 weak_finish_1 (tree decl
)
5864 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5865 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5868 if (! TREE_USED (decl
))
5871 #ifdef ASM_WEAKEN_DECL
5872 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5874 #ifdef ASM_WEAKEN_LABEL
5875 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5877 #ifdef ASM_OUTPUT_WEAK_ALIAS
5879 static bool warn_once
= 0;
5882 warning (0, "only weak aliases are supported in this configuration");
5892 /* Fiven an assembly name, find the decl it is associated with. */
5894 find_decl (tree target
)
5896 symtab_node
*node
= symtab_node::get_for_asmname (target
);
5902 /* This TREE_LIST contains weakref targets. */
5904 static GTY(()) tree weakref_targets
;
5906 /* Emit any pending weak declarations. */
5913 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5915 tree alias_decl
= TREE_PURPOSE (t
);
5916 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5918 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
))
5919 || TREE_SYMBOL_REFERENCED (target
))
5920 /* Remove alias_decl from the weak list, but leave entries for
5921 the target alone. */
5923 #ifndef ASM_OUTPUT_WEAKREF
5924 else if (! TREE_SYMBOL_REFERENCED (target
))
5926 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5927 defined, otherwise we and weak_finish_1 would use
5928 different macros. */
5929 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5930 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5932 tree decl
= find_decl (target
);
5936 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5937 TREE_CODE (alias_decl
), target
,
5938 TREE_TYPE (alias_decl
));
5940 DECL_EXTERNAL (decl
) = 1;
5941 TREE_PUBLIC (decl
) = 1;
5942 DECL_ARTIFICIAL (decl
) = 1;
5943 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5944 TREE_USED (decl
) = 1;
5947 weak_finish_1 (decl
);
5956 /* Remove the alias and the target from the pending weak list
5957 so that we do not emit any .weak directives for the former,
5958 nor multiple .weak directives for the latter. */
5959 for (p
= &weak_decls
; (t2
= *p
) ; )
5961 if (TREE_VALUE (t2
) == alias_decl
5962 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5963 *p
= TREE_CHAIN (t2
);
5965 p
= &TREE_CHAIN (t2
);
5968 /* Remove other weakrefs to the same target, to speed things up. */
5969 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5971 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5972 *p
= TREE_CHAIN (t2
);
5974 p
= &TREE_CHAIN (t2
);
5979 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5981 tree decl
= TREE_VALUE (t
);
5983 weak_finish_1 (decl
);
5987 /* Emit the assembly bits to indicate that DECL is globally visible. */
5990 globalize_decl (tree decl
)
5993 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5994 if (DECL_WEAK (decl
))
5996 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5999 #ifdef ASM_WEAKEN_DECL
6000 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
6002 ASM_WEAKEN_LABEL (asm_out_file
, name
);
6005 /* Remove this function from the pending weak list so that
6006 we do not emit multiple .weak directives for it. */
6007 for (p
= &weak_decls
; (t
= *p
) ; )
6009 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
6010 *p
= TREE_CHAIN (t
);
6012 p
= &TREE_CHAIN (t
);
6015 /* Remove weakrefs to the same target from the pending weakref
6016 list, for the same reason. */
6017 for (p
= &weakref_targets
; (t
= *p
) ; )
6019 if (DECL_ASSEMBLER_NAME (decl
)
6020 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
6021 *p
= TREE_CHAIN (t
);
6023 p
= &TREE_CHAIN (t
);
6030 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
6033 vec
<alias_pair
, va_gc
> *alias_pairs
;
6035 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
6036 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
6037 tree node is DECL to have the value of the tree node TARGET. */
6040 do_assemble_alias (tree decl
, tree target
)
6044 /* Emulated TLS had better not get this var. */
6045 gcc_assert (!(!targetm
.have_tls
6047 && DECL_THREAD_LOCAL_P (decl
)));
6049 if (TREE_ASM_WRITTEN (decl
))
6052 id
= DECL_ASSEMBLER_NAME (decl
);
6053 ultimate_transparent_alias_target (&id
);
6054 ultimate_transparent_alias_target (&target
);
6056 /* We must force creation of DECL_RTL for debug info generation, even though
6057 we don't use it here. */
6058 make_decl_rtl (decl
);
6060 TREE_ASM_WRITTEN (decl
) = 1;
6061 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
6062 TREE_ASM_WRITTEN (id
) = 1;
6064 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
6066 if (!TREE_SYMBOL_REFERENCED (target
))
6067 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
6069 #ifdef ASM_OUTPUT_WEAKREF
6070 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
6071 IDENTIFIER_POINTER (id
),
6072 IDENTIFIER_POINTER (target
));
6074 if (!TARGET_SUPPORTS_WEAK
)
6076 error_at (DECL_SOURCE_LOCATION (decl
),
6077 "weakref is not supported in this configuration");
6084 #ifdef ASM_OUTPUT_DEF
6085 tree orig_decl
= decl
;
6087 /* Make name accessible from other files, if appropriate. */
6089 if (TREE_PUBLIC (decl
) || TREE_PUBLIC (orig_decl
))
6091 globalize_decl (decl
);
6092 maybe_assemble_visibility (decl
);
6094 if (TREE_CODE (decl
) == FUNCTION_DECL
6095 && cgraph_node::get (decl
)->ifunc_resolver
)
6097 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
6098 if (targetm
.has_ifunc_p ())
6099 ASM_OUTPUT_TYPE_DIRECTIVE
6100 (asm_out_file
, IDENTIFIER_POINTER (id
),
6104 error_at (DECL_SOURCE_LOCATION (decl
),
6105 "%qs is not supported on this target", "ifunc");
6108 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
6109 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
6111 ASM_OUTPUT_DEF (asm_out_file
,
6112 IDENTIFIER_POINTER (id
),
6113 IDENTIFIER_POINTER (target
));
6115 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
6120 name
= IDENTIFIER_POINTER (id
);
6121 # ifdef ASM_WEAKEN_DECL
6122 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
6124 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
6126 /* Remove this function from the pending weak list so that
6127 we do not emit multiple .weak directives for it. */
6128 for (p
= &weak_decls
; (t
= *p
) ; )
6129 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
))
6130 || id
== DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
6131 *p
= TREE_CHAIN (t
);
6133 p
= &TREE_CHAIN (t
);
6135 /* Remove weakrefs to the same target from the pending weakref
6136 list, for the same reason. */
6137 for (p
= &weakref_targets
; (t
= *p
) ; )
6139 if (id
== ultimate_transparent_alias_target (&TREE_VALUE (t
)))
6140 *p
= TREE_CHAIN (t
);
6142 p
= &TREE_CHAIN (t
);
6148 /* Output .symver directive. */
6151 do_assemble_symver (tree decl
, tree target
)
6153 tree id
= DECL_ASSEMBLER_NAME (decl
);
6154 ultimate_transparent_alias_target (&id
);
6155 ultimate_transparent_alias_target (&target
);
6156 #ifdef ASM_OUTPUT_SYMVER_DIRECTIVE
6157 ASM_OUTPUT_SYMVER_DIRECTIVE (asm_out_file
,
6158 IDENTIFIER_POINTER (target
),
6159 IDENTIFIER_POINTER (id
));
6161 error ("symver is only supported on ELF platforms");
6165 /* Emit an assembler directive to make the symbol for DECL an alias to
6166 the symbol for TARGET. */
6169 assemble_alias (tree decl
, tree target
)
6173 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
6175 tree alias
= DECL_ASSEMBLER_NAME (decl
);
6177 ultimate_transparent_alias_target (&target
);
6179 if (alias
== target
)
6180 error ("%qs symbol %q+D ultimately targets itself", "weakref", decl
);
6181 if (TREE_PUBLIC (decl
))
6182 error ("%qs symbol %q+D must have static linkage", "weakref", decl
);
6186 #if !defined (ASM_OUTPUT_DEF)
6187 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
6188 error_at (DECL_SOURCE_LOCATION (decl
),
6189 "alias definitions not supported in this configuration");
6190 TREE_ASM_WRITTEN (decl
) = 1;
6193 if (!DECL_WEAK (decl
))
6195 /* NB: ifunc_resolver isn't set when an error is detected. */
6196 if (TREE_CODE (decl
) == FUNCTION_DECL
6197 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
6198 error_at (DECL_SOURCE_LOCATION (decl
),
6199 "%qs is not supported in this configuration", "ifunc");
6201 error_at (DECL_SOURCE_LOCATION (decl
),
6202 "only weak aliases are supported in this configuration");
6203 TREE_ASM_WRITTEN (decl
) = 1;
6209 TREE_USED (decl
) = 1;
6211 /* Allow aliases to aliases. */
6212 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6213 cgraph_node::get_create (decl
)->alias
= true;
6215 varpool_node::get_create (decl
)->alias
= true;
6217 /* If the target has already been emitted, we don't have to queue the
6218 alias. This saves a tad of memory. */
6219 if (symtab
->global_info_ready
)
6220 target_decl
= find_decl (target
);
6223 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
6224 || symtab
->state
>= EXPANSION
)
6225 do_assemble_alias (decl
, target
);
6228 alias_pair p
= {decl
, target
};
6229 vec_safe_push (alias_pairs
, p
);
6233 /* Record and output a table of translations from original function
6234 to its transaction aware clone. Note that tm_pure functions are
6235 considered to be their own clone. */
6237 struct tm_clone_hasher
: ggc_cache_ptr_hash
<tree_map
>
6239 static hashval_t
hash (tree_map
*m
) { return tree_map_hash (m
); }
6240 static bool equal (tree_map
*a
, tree_map
*b
) { return tree_map_eq (a
, b
); }
6243 keep_cache_entry (tree_map
*&e
)
6245 return ggc_marked_p (e
->base
.from
);
6249 static GTY((cache
)) hash_table
<tm_clone_hasher
> *tm_clone_hash
;
6252 record_tm_clone_pair (tree o
, tree n
)
6254 struct tree_map
**slot
, *h
;
6256 if (tm_clone_hash
== NULL
)
6257 tm_clone_hash
= hash_table
<tm_clone_hasher
>::create_ggc (32);
6259 h
= ggc_alloc
<tree_map
> ();
6260 h
->hash
= htab_hash_pointer (o
);
6264 slot
= tm_clone_hash
->find_slot_with_hash (h
, h
->hash
, INSERT
);
6269 get_tm_clone_pair (tree o
)
6273 struct tree_map
*h
, in
;
6276 in
.hash
= htab_hash_pointer (o
);
6277 h
= tm_clone_hash
->find_with_hash (&in
, in
.hash
);
6284 struct tm_alias_pair
6292 /* Dump the actual pairs to the .tm_clone_table section. */
6295 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
6299 bool switched
= false;
6301 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
6305 struct cgraph_node
*src_n
= cgraph_node::get (src
);
6306 struct cgraph_node
*dst_n
= cgraph_node::get (dst
);
6308 /* The function ipa_tm_create_version() marks the clone as needed if
6309 the original function was needed. But we also mark the clone as
6310 needed if we ever called the clone indirectly through
6311 TM_GETTMCLONE. If neither of these are true, we didn't generate
6312 a clone, and we didn't call it indirectly... no sense keeping it
6313 in the clone table. */
6314 if (!dst_n
|| !dst_n
->definition
)
6317 /* This covers the case where we have optimized the original
6318 function away, and only access the transactional clone. */
6319 if (!src_n
|| !src_n
->definition
)
6324 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
6325 assemble_align (POINTER_SIZE
);
6329 assemble_integer (XEXP (DECL_RTL (src
), 0),
6330 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
6331 assemble_integer (XEXP (DECL_RTL (dst
), 0),
6332 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
6336 /* Provide a default for the tm_clone_table section. */
6339 default_clone_table_section (void)
6341 return get_named_section (NULL
, ".tm_clone_table", 3);
6344 /* Helper comparison function for qsorting by the DECL_UID stored in
6345 alias_pair->emitted_diags. */
6348 tm_alias_pair_cmp (const void *x
, const void *y
)
6350 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
6351 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
6352 if (p1
->uid
< p2
->uid
)
6354 if (p1
->uid
> p2
->uid
)
6360 finish_tm_clone_pairs (void)
6362 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
6364 if (tm_clone_hash
== NULL
)
6367 /* We need a determenistic order for the .tm_clone_table, otherwise
6368 we will get bootstrap comparison failures, so dump the hash table
6369 to a vector, sort it, and dump the vector. */
6371 /* Dump the hashtable to a vector. */
6373 hash_table
<tm_clone_hasher
>::iterator iter
;
6374 FOR_EACH_HASH_TABLE_ELEMENT (*tm_clone_hash
, map
, tree_map
*, iter
)
6376 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
6377 tm_alias_pairs
.safe_push (p
);
6380 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
6383 dump_tm_clone_pairs (tm_alias_pairs
);
6385 tm_clone_hash
->empty ();
6386 tm_clone_hash
= NULL
;
6387 tm_alias_pairs
.release ();
6391 /* Emit an assembler directive to set symbol for DECL visibility to
6392 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
6395 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
6396 int vis ATTRIBUTE_UNUSED
)
6398 #ifdef HAVE_GAS_HIDDEN
6399 static const char * const visibility_types
[] = {
6400 NULL
, "protected", "hidden", "internal"
6403 const char *name
, *type
;
6406 id
= DECL_ASSEMBLER_NAME (decl
);
6407 ultimate_transparent_alias_target (&id
);
6408 name
= IDENTIFIER_POINTER (id
);
6410 type
= visibility_types
[vis
];
6412 fprintf (asm_out_file
, "\t.%s\t", type
);
6413 assemble_name (asm_out_file
, name
);
6414 fprintf (asm_out_file
, "\n");
6416 if (!DECL_ARTIFICIAL (decl
))
6417 warning (OPT_Wattributes
, "visibility attribute not supported "
6418 "in this configuration; ignored");
6422 /* A helper function to call assemble_visibility when needed for a decl. */
6425 maybe_assemble_visibility (tree decl
)
6427 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
6428 if (vis
!= VISIBILITY_DEFAULT
)
6430 targetm
.asm_out
.assemble_visibility (decl
, vis
);
6437 /* Returns 1 if the target configuration supports defining public symbols
6438 so that one of them will be chosen at link time instead of generating a
6439 multiply-defined symbol error, whether through the use of weak symbols or
6440 a target-specific mechanism for having duplicates discarded. */
6443 supports_one_only (void)
6445 if (SUPPORTS_ONE_ONLY
)
6447 return TARGET_SUPPORTS_WEAK
;
6450 /* Set up DECL as a public symbol that can be defined in multiple
6451 translation units without generating a linker error. */
6454 make_decl_one_only (tree decl
, tree comdat_group
)
6456 struct symtab_node
*symbol
;
6457 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
6459 TREE_PUBLIC (decl
) = 1;
6462 symbol
= varpool_node::get_create (decl
);
6464 symbol
= cgraph_node::get_create (decl
);
6466 if (SUPPORTS_ONE_ONLY
)
6468 #ifdef MAKE_DECL_ONE_ONLY
6469 MAKE_DECL_ONE_ONLY (decl
);
6471 symbol
->set_comdat_group (comdat_group
);
6473 else if (VAR_P (decl
)
6474 && (DECL_INITIAL (decl
) == 0
6475 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6476 DECL_COMMON (decl
) = 1;
6479 gcc_assert (TARGET_SUPPORTS_WEAK
);
6480 DECL_WEAK (decl
) = 1;
6485 init_varasm_once (void)
6487 section_htab
= hash_table
<section_hasher
>::create_ggc (31);
6488 object_block_htab
= hash_table
<object_block_hasher
>::create_ggc (31);
6489 const_desc_htab
= hash_table
<tree_descriptor_hasher
>::create_ggc (1009);
6491 shared_constant_pool
= create_constant_pool ();
6493 #ifdef TEXT_SECTION_ASM_OP
6494 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
6495 TEXT_SECTION_ASM_OP
);
6498 #ifdef DATA_SECTION_ASM_OP
6499 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6500 DATA_SECTION_ASM_OP
);
6503 #ifdef SDATA_SECTION_ASM_OP
6504 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6505 SDATA_SECTION_ASM_OP
);
6508 #ifdef READONLY_DATA_SECTION_ASM_OP
6509 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
6510 READONLY_DATA_SECTION_ASM_OP
);
6513 #ifdef CTORS_SECTION_ASM_OP
6514 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
6515 CTORS_SECTION_ASM_OP
);
6518 #ifdef DTORS_SECTION_ASM_OP
6519 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
6520 DTORS_SECTION_ASM_OP
);
6523 #ifdef BSS_SECTION_ASM_OP
6524 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6525 output_section_asm_op
,
6526 BSS_SECTION_ASM_OP
);
6529 #ifdef SBSS_SECTION_ASM_OP
6530 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6531 output_section_asm_op
,
6532 SBSS_SECTION_ASM_OP
);
6535 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6536 | SECTION_COMMON
, emit_tls_common
);
6537 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6538 | SECTION_COMMON
, emit_local
);
6539 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6540 | SECTION_COMMON
, emit_common
);
6542 #if defined ASM_OUTPUT_ALIGNED_BSS
6543 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
6547 targetm
.asm_out
.init_sections ();
6549 if (readonly_data_section
== NULL
)
6550 readonly_data_section
= text_section
;
6552 #ifdef ASM_OUTPUT_EXTERNAL
6553 pending_assemble_externals_set
= new hash_set
<tree
>;
6558 decl_default_tls_model (const_tree decl
)
6560 enum tls_model kind
;
6563 is_local
= targetm
.binds_local_p (decl
);
6567 kind
= TLS_MODEL_LOCAL_EXEC
;
6569 kind
= TLS_MODEL_INITIAL_EXEC
;
6572 /* Local dynamic is inefficient when we're not combining the
6573 parts of the address. */
6574 else if (optimize
&& is_local
)
6575 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
6577 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
6578 if (kind
< flag_tls_default
)
6579 kind
= flag_tls_default
;
6584 /* Select a set of attributes for section NAME based on the properties
6585 of DECL and whether or not RELOC indicates that DECL's initializer
6586 might contain runtime relocations.
6588 We make the section read-only and executable for a function decl,
6589 read-only for a const data decl, and writable for a non-const data decl. */
6592 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6596 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6597 flags
= SECTION_CODE
;
6600 enum section_category category
6601 = categorize_decl_for_section (decl
, reloc
);
6602 if (decl_readonly_section_1 (category
))
6604 else if (category
== SECCAT_DATA_REL_RO
6605 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6606 flags
= SECTION_WRITE
| SECTION_RELRO
;
6608 flags
= SECTION_WRITE
;
6612 flags
= SECTION_WRITE
;
6613 if (strcmp (name
, ".data.rel.ro") == 0
6614 || strcmp (name
, ".data.rel.ro.local") == 0)
6615 flags
|= SECTION_RELRO
;
6618 if (decl
&& DECL_P (decl
) && DECL_COMDAT_GROUP (decl
))
6619 flags
|= SECTION_LINKONCE
;
6621 if (strcmp (name
, ".vtable_map_vars") == 0)
6622 flags
|= SECTION_LINKONCE
;
6624 if (decl
&& VAR_P (decl
) && DECL_THREAD_LOCAL_P (decl
))
6625 flags
|= SECTION_TLS
| SECTION_WRITE
;
6627 if (strcmp (name
, ".bss") == 0
6628 || strncmp (name
, ".bss.", 5) == 0
6629 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6630 || strcmp (name
, ".persistent.bss") == 0
6631 || strcmp (name
, ".sbss") == 0
6632 || strncmp (name
, ".sbss.", 6) == 0
6633 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6634 flags
|= SECTION_BSS
;
6636 if (strcmp (name
, ".tdata") == 0
6637 || strncmp (name
, ".tdata.", 7) == 0
6638 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6639 flags
|= SECTION_TLS
;
6641 if (strcmp (name
, ".tbss") == 0
6642 || strncmp (name
, ".tbss.", 6) == 0
6643 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6644 flags
|= SECTION_TLS
| SECTION_BSS
;
6646 if (strcmp (name
, ".noinit") == 0)
6647 flags
|= SECTION_WRITE
| SECTION_BSS
| SECTION_NOTYPE
;
6649 /* Various sections have special ELF types that the assembler will
6650 assign by default based on the name. They are neither SHT_PROGBITS
6651 nor SHT_NOBITS, so when changing sections we don't want to print a
6652 section type (@progbits or @nobits). Rather than duplicating the
6653 assembler's knowledge of what those special name patterns are, just
6654 let the assembler choose the type if we don't know a specific
6655 reason to set it to something other than the default. SHT_PROGBITS
6656 is the default for sections whose name is not specially known to
6657 the assembler, so it does no harm to leave the choice to the
6658 assembler when @progbits is the best thing we know to use. If
6659 someone is silly enough to emit code or TLS variables to one of
6660 these sections, then don't handle them specially.
6662 default_elf_asm_named_section (below) handles the BSS, TLS, ENTSIZE, and
6663 LINKONCE cases when NOTYPE is not set, so leave those to its logic. */
6664 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
| SECTION_ENTSIZE
))
6665 && !(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
)))
6666 flags
|= SECTION_NOTYPE
;
6671 /* Return true if the target supports some form of global BSS,
6672 either through bss_noswitch_section, or by selecting a BSS
6673 section in TARGET_ASM_SELECT_SECTION. */
6676 have_global_bss_p (void)
6678 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6681 /* Output assembly to switch to section NAME with attribute FLAGS.
6682 Four variants for common object file formats. */
6685 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6686 unsigned int flags ATTRIBUTE_UNUSED
,
6687 tree decl ATTRIBUTE_UNUSED
)
6689 /* Some object formats don't support named sections at all. The
6690 front-end should already have flagged this as an error. */
6694 #ifndef TLS_SECTION_ASM_FLAG
6695 #define TLS_SECTION_ASM_FLAG 'T'
6699 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6702 char flagchars
[11], *f
= flagchars
;
6703 unsigned int numeric_value
= 0;
6705 /* If we have already declared this section, we can use an
6706 abbreviated form to switch back to it -- unless this section is
6707 part of a COMDAT groups, in which case GAS requires the full
6708 declaration every time. */
6709 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6710 && (flags
& SECTION_DECLARED
))
6712 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6716 /* If we have a machine specific flag, then use the numeric value to pass
6718 if (targetm
.asm_out
.elf_flags_numeric (flags
, &numeric_value
))
6719 snprintf (f
, sizeof (flagchars
), "0x%08x", numeric_value
);
6722 if (!(flags
& SECTION_DEBUG
))
6724 #if HAVE_GAS_SECTION_EXCLUDE
6725 if (flags
& SECTION_EXCLUDE
)
6728 if (flags
& SECTION_WRITE
)
6730 if (flags
& SECTION_CODE
)
6732 if (flags
& SECTION_SMALL
)
6734 if (flags
& SECTION_MERGE
)
6736 if (flags
& SECTION_STRINGS
)
6738 if (flags
& SECTION_TLS
)
6739 *f
++ = TLS_SECTION_ASM_FLAG
;
6740 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6742 #ifdef MACH_DEP_SECTION_ASM_FLAG
6743 if (flags
& SECTION_MACH_DEP
)
6744 *f
++ = MACH_DEP_SECTION_ASM_FLAG
;
6749 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6751 /* default_section_type_flags (above) knows which flags need special
6752 handling here, and sets NOTYPE when none of these apply so that the
6753 assembler's logic for default types can apply to user-chosen
6755 if (!(flags
& SECTION_NOTYPE
))
6760 if (flags
& SECTION_BSS
)
6766 /* On platforms that use "@" as the assembly comment character,
6768 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6770 fprintf (asm_out_file
, format
, type
);
6772 if (flags
& SECTION_ENTSIZE
)
6773 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6774 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6776 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6777 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6779 fprintf (asm_out_file
, ",%s,comdat",
6780 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6784 putc ('\n', asm_out_file
);
6788 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6789 tree decl ATTRIBUTE_UNUSED
)
6791 char flagchars
[8], *f
= flagchars
;
6793 if (flags
& SECTION_WRITE
)
6795 if (flags
& SECTION_CODE
)
6799 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6803 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6806 default_coff_asm_named_section (name
, flags
, decl
);
6808 if (flags
& SECTION_LINKONCE
)
6810 /* Functions may have been compiled at various levels of
6811 optimization so we can't use `same_size' here.
6812 Instead, have the linker pick one. */
6813 fprintf (asm_out_file
, "\t.linkonce %s\n",
6814 (flags
& SECTION_CODE
? "discard" : "same_size"));
6818 /* The lame default section selector. */
6821 default_select_section (tree decl
, int reloc
,
6822 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6826 if (decl_readonly_section (decl
, reloc
))
6827 return readonly_data_section
;
6829 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6831 if (! ((flag_pic
&& reloc
)
6832 || !TREE_READONLY (decl
)
6833 || TREE_SIDE_EFFECTS (decl
)
6834 || !TREE_CONSTANT (decl
)))
6835 return readonly_data_section
;
6837 else if (TREE_CODE (decl
) == STRING_CST
)
6838 return readonly_data_section
;
6839 else if (! (flag_pic
&& reloc
))
6840 return readonly_data_section
;
6842 return data_section
;
6845 enum section_category
6846 categorize_decl_for_section (const_tree decl
, int reloc
)
6848 enum section_category ret
;
6850 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6852 else if (TREE_CODE (decl
) == STRING_CST
)
6854 if ((flag_sanitize
& SANITIZE_ADDRESS
)
6855 && asan_protect_global (CONST_CAST_TREE (decl
)))
6856 /* or !flag_merge_constants */
6857 return SECCAT_RODATA
;
6859 return SECCAT_RODATA_MERGE_STR
;
6861 else if (VAR_P (decl
))
6863 tree d
= CONST_CAST_TREE (decl
);
6864 if (bss_initializer_p (decl
))
6866 else if (! TREE_READONLY (decl
)
6867 || TREE_SIDE_EFFECTS (decl
)
6868 || (DECL_INITIAL (decl
)
6869 && ! TREE_CONSTANT (DECL_INITIAL (decl
))))
6871 /* Here the reloc_rw_mask is not testing whether the section should
6872 be read-only or not, but whether the dynamic link will have to
6873 do something. If so, we wish to segregate the data in order to
6874 minimize cache misses inside the dynamic linker. */
6875 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6876 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6880 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6881 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6882 else if (reloc
|| flag_merge_constants
< 2
6883 || ((flag_sanitize
& SANITIZE_ADDRESS
)
6884 /* PR 81697: for architectures that use section anchors we
6885 need to ignore DECL_RTL_SET_P (decl) for string constants
6886 inside this asan_protect_global call because otherwise
6887 we'll wrongly put them into SECCAT_RODATA_MERGE_CONST
6888 section, set DECL_RTL (decl) later on and add DECL to
6889 protected globals via successive asan_protect_global
6890 calls. In this scenario we'll end up with wrong
6891 alignment of these strings at runtime and possible ASan
6893 && asan_protect_global (d
, use_object_blocks_p ()
6894 && use_blocks_for_decl_p (d
))))
6895 /* C and C++ don't allow different variables to share the same
6896 location. -fmerge-all-constants allows even that (at the
6897 expense of not conforming). */
6898 ret
= SECCAT_RODATA
;
6899 else if (DECL_INITIAL (decl
)
6900 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6901 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6903 ret
= SECCAT_RODATA_MERGE_CONST
;
6905 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6907 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6908 || TREE_SIDE_EFFECTS (decl
)
6909 || ! TREE_CONSTANT (decl
))
6912 ret
= SECCAT_RODATA
;
6915 ret
= SECCAT_RODATA
;
6917 /* There are no read-only thread-local sections. */
6918 if (VAR_P (decl
) && DECL_THREAD_LOCAL_P (decl
))
6920 /* Note that this would be *just* SECCAT_BSS, except that there's
6921 no concept of a read-only thread-local-data section. */
6922 if (ret
== SECCAT_BSS
6923 || DECL_INITIAL (decl
) == NULL
6924 || (flag_zero_initialized_in_bss
6925 && initializer_zerop (DECL_INITIAL (decl
))))
6931 /* If the target uses small data sections, select it. */
6932 else if (targetm
.in_small_data_p (decl
))
6934 if (ret
== SECCAT_BSS
)
6936 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6937 ret
= SECCAT_SRODATA
;
6946 decl_readonly_section_1 (enum section_category category
)
6951 case SECCAT_RODATA_MERGE_STR
:
6952 case SECCAT_RODATA_MERGE_STR_INIT
:
6953 case SECCAT_RODATA_MERGE_CONST
:
6954 case SECCAT_SRODATA
:
6962 decl_readonly_section (const_tree decl
, int reloc
)
6964 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6967 /* Select a section based on the above categorization. */
6970 default_elf_select_section (tree decl
, int reloc
,
6971 unsigned HOST_WIDE_INT align
)
6975 switch (categorize_decl_for_section (decl
, reloc
))
6978 /* We're not supposed to be called on FUNCTION_DECLs. */
6981 return readonly_data_section
;
6982 case SECCAT_RODATA_MERGE_STR
:
6983 return mergeable_string_section (decl
, align
, 0);
6984 case SECCAT_RODATA_MERGE_STR_INIT
:
6985 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6986 case SECCAT_RODATA_MERGE_CONST
:
6987 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6988 case SECCAT_SRODATA
:
6992 return data_section
;
6993 case SECCAT_DATA_REL
:
6994 sname
= ".data.rel";
6996 case SECCAT_DATA_REL_LOCAL
:
6997 sname
= ".data.rel.local";
6999 case SECCAT_DATA_REL_RO
:
7000 sname
= ".data.rel.ro";
7002 case SECCAT_DATA_REL_RO_LOCAL
:
7003 sname
= ".data.rel.ro.local";
7013 && lookup_attribute ("noinit", DECL_ATTRIBUTES (decl
)) != NULL_TREE
)
7033 return get_named_section (decl
, sname
, reloc
);
7036 /* Construct a unique section name based on the decl name and the
7037 categorization performed above. */
7040 default_unique_section (tree decl
, int reloc
)
7042 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
7043 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
7044 const char *prefix
, *name
, *linkonce
;
7048 switch (categorize_decl_for_section (decl
, reloc
))
7051 prefix
= one_only
? ".t" : ".text";
7054 case SECCAT_RODATA_MERGE_STR
:
7055 case SECCAT_RODATA_MERGE_STR_INIT
:
7056 case SECCAT_RODATA_MERGE_CONST
:
7057 prefix
= one_only
? ".r" : ".rodata";
7059 case SECCAT_SRODATA
:
7060 prefix
= one_only
? ".s2" : ".sdata2";
7063 prefix
= one_only
? ".d" : ".data";
7065 case SECCAT_DATA_REL
:
7066 prefix
= one_only
? ".d.rel" : ".data.rel";
7068 case SECCAT_DATA_REL_LOCAL
:
7069 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
7071 case SECCAT_DATA_REL_RO
:
7072 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
7074 case SECCAT_DATA_REL_RO_LOCAL
:
7075 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
7078 prefix
= one_only
? ".s" : ".sdata";
7081 prefix
= one_only
? ".b" : ".bss";
7084 prefix
= one_only
? ".sb" : ".sbss";
7087 prefix
= one_only
? ".td" : ".tdata";
7090 prefix
= one_only
? ".tb" : ".tbss";
7096 id
= DECL_ASSEMBLER_NAME (decl
);
7097 ultimate_transparent_alias_target (&id
);
7098 name
= IDENTIFIER_POINTER (id
);
7099 name
= targetm
.strip_name_encoding (name
);
7101 /* If we're using one_only, then there needs to be a .gnu.linkonce
7102 prefix to the section name. */
7103 linkonce
= one_only
? ".gnu.linkonce" : "";
7105 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
7107 set_decl_section_name (decl
, string
);
7110 /* Subroutine of compute_reloc_for_rtx for leaf rtxes. */
7113 compute_reloc_for_rtx_1 (const_rtx x
)
7115 switch (GET_CODE (x
))
7118 return SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
7126 /* Like compute_reloc_for_constant, except for an RTX. The return value
7127 is a mask for which bit 1 indicates a global relocation, and bit 0
7128 indicates a local relocation. */
7131 compute_reloc_for_rtx (const_rtx x
)
7133 switch (GET_CODE (x
))
7137 return compute_reloc_for_rtx_1 (x
);
7142 subrtx_iterator::array_type array
;
7143 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
7144 reloc
|= compute_reloc_for_rtx_1 (*iter
);
7154 default_select_rtx_section (machine_mode mode ATTRIBUTE_UNUSED
,
7156 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
7158 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
7159 return data_section
;
7161 return readonly_data_section
;
7165 default_elf_select_rtx_section (machine_mode mode
, rtx x
,
7166 unsigned HOST_WIDE_INT align
)
7168 int reloc
= compute_reloc_for_rtx (x
);
7170 /* ??? Handle small data here somehow. */
7172 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
7175 return get_named_section (NULL
, ".data.rel.ro.local", 1);
7177 return get_named_section (NULL
, ".data.rel.ro", 3);
7180 return mergeable_constant_section (mode
, align
, 0);
7183 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
7186 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
7191 /* Careful not to prod global register variables. */
7194 symbol
= XEXP (rtl
, 0);
7195 if (GET_CODE (symbol
) != SYMBOL_REF
)
7198 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
7199 if (TREE_CODE (decl
) == FUNCTION_DECL
)
7200 flags
|= SYMBOL_FLAG_FUNCTION
;
7201 if (targetm
.binds_local_p (decl
))
7202 flags
|= SYMBOL_FLAG_LOCAL
;
7203 if (VAR_P (decl
) && DECL_THREAD_LOCAL_P (decl
))
7204 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
7205 else if (targetm
.in_small_data_p (decl
))
7206 flags
|= SYMBOL_FLAG_SMALL
;
7207 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
7208 being PUBLIC, the thing *must* be defined in this translation unit.
7209 Prevent this buglet from being propagated into rtl code as well. */
7210 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
7211 flags
|= SYMBOL_FLAG_EXTERNAL
;
7213 SYMBOL_REF_FLAGS (symbol
) = flags
;
7216 /* By default, we do nothing for encode_section_info, so we need not
7217 do anything but discard the '*' marker. */
7220 default_strip_name_encoding (const char *str
)
7222 return str
+ (*str
== '*');
7225 #ifdef ASM_OUTPUT_DEF
7226 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
7227 anchor relative to ".", the current section position. */
7230 default_asm_output_anchor (rtx symbol
)
7234 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
7235 SYMBOL_REF_BLOCK_OFFSET (symbol
));
7236 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
7240 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
7243 default_use_anchors_for_symbol_p (const_rtx symbol
)
7246 section
*sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
7248 /* This function should only be called with non-zero SYMBOL_REF_BLOCK,
7249 furthermore get_block_for_section should not create object blocks
7250 for mergeable sections. */
7251 gcc_checking_assert (sect
&& !(sect
->common
.flags
& SECTION_MERGE
));
7253 /* Don't use anchors for small data sections. The small data register
7254 acts as an anchor for such sections. */
7255 if (sect
->common
.flags
& SECTION_SMALL
)
7258 decl
= SYMBOL_REF_DECL (symbol
);
7259 if (decl
&& DECL_P (decl
))
7261 /* Don't use section anchors for decls that might be defined or
7262 usurped by other modules. */
7263 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
7266 /* Don't use section anchors for decls that will be placed in a
7267 small data section. */
7268 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
7269 one above. The problem is that we only use SECTION_SMALL for
7270 sections that should be marked as small in the section directive. */
7271 if (targetm
.in_small_data_p (decl
))
7274 /* Don't use section anchors for decls that won't fit inside a single
7275 anchor range to reduce the amount of instructions required to refer
7276 to the entire declaration. */
7277 if (DECL_SIZE_UNIT (decl
) == NULL_TREE
7278 || !tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
))
7279 || (tree_to_uhwi (DECL_SIZE_UNIT (decl
))
7280 >= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
))
7287 /* Return true when RESOLUTION indicate that symbol will be bound to the
7288 definition provided by current .o file. */
7291 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
7293 return (resolution
== LDPR_PREVAILING_DEF
7294 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
7295 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
7298 /* Return true when RESOLUTION indicate that symbol will be bound locally
7299 within current executable or DSO. */
7302 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
7304 return (resolution
== LDPR_PREVAILING_DEF
7305 || resolution
== LDPR_PREVAILING_DEF_IRONLY
7306 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
7307 || resolution
== LDPR_PREEMPTED_REG
7308 || resolution
== LDPR_PREEMPTED_IR
7309 || resolution
== LDPR_RESOLVED_IR
7310 || resolution
== LDPR_RESOLVED_EXEC
);
7313 /* COMMON_LOCAL_P is true means that the linker can guarantee that an
7314 uninitialized common symbol in the executable will still be defined
7315 (through COPY relocation) in the executable. */
7318 default_binds_local_p_3 (const_tree exp
, bool shlib
, bool weak_dominate
,
7319 bool extern_protected_data
, bool common_local_p
)
7321 /* A non-decl is an entry in the constant pool. */
7325 /* Weakrefs may not bind locally, even though the weakref itself is always
7326 static and therefore local. Similarly, the resolver for ifunc functions
7327 might resolve to a non-local function.
7328 FIXME: We can resolve the weakref case more curefuly by looking at the
7330 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
7331 || (TREE_CODE (exp
) == FUNCTION_DECL
7332 && cgraph_node::get (exp
)
7333 && cgraph_node::get (exp
)->ifunc_resolver
))
7336 /* Static variables are always local. */
7337 if (! TREE_PUBLIC (exp
))
7340 /* With resolution file in hand, take look into resolutions.
7341 We can't just return true for resolved_locally symbols,
7342 because dynamic linking might overwrite symbols
7343 in shared libraries. */
7344 bool resolved_locally
= false;
7346 bool uninited_common
= (DECL_COMMON (exp
)
7347 && (DECL_INITIAL (exp
) == NULL
7349 && DECL_INITIAL (exp
) == error_mark_node
)));
7351 /* A non-external variable is defined locally only if it isn't
7352 uninitialized COMMON variable or common_local_p is true. */
7353 bool defined_locally
= (!DECL_EXTERNAL (exp
)
7354 && (!uninited_common
|| common_local_p
));
7355 if (symtab_node
*node
= symtab_node::get (exp
))
7357 if (node
->in_other_partition
)
7358 defined_locally
= true;
7359 if (node
->can_be_discarded_p ())
7361 else if (resolution_to_local_definition_p (node
->resolution
))
7362 defined_locally
= resolved_locally
= true;
7363 else if (resolution_local_p (node
->resolution
))
7364 resolved_locally
= true;
7366 if (defined_locally
&& weak_dominate
&& !shlib
)
7367 resolved_locally
= true;
7369 /* Undefined weak symbols are never defined locally. */
7370 if (DECL_WEAK (exp
) && !defined_locally
)
7373 /* A symbol is local if the user has said explicitly that it will be,
7374 or if we have a definition for the symbol. We cannot infer visibility
7375 for undefined symbols. */
7376 if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
7377 && (TREE_CODE (exp
) == FUNCTION_DECL
7378 || !extern_protected_data
7379 || DECL_VISIBILITY (exp
) != VISIBILITY_PROTECTED
)
7380 && (DECL_VISIBILITY_SPECIFIED (exp
) || defined_locally
))
7383 /* If PIC, then assume that any global name can be overridden by
7384 symbols resolved from other modules. */
7388 /* Variables defined outside this object might not be local. */
7389 if (DECL_EXTERNAL (exp
) && !resolved_locally
)
7392 /* Non-dominant weak symbols are not defined locally. */
7393 if (DECL_WEAK (exp
) && !resolved_locally
)
7396 /* Uninitialized COMMON variable may be unified with symbols
7397 resolved from other modules. */
7398 if (uninited_common
&& !resolved_locally
)
7401 /* Otherwise we're left with initialized (or non-common) global data
7402 which is of necessity defined locally. */
7406 /* Assume ELF-ish defaults, since that's pretty much the most liberal
7407 wrt cross-module name binding. */
7410 default_binds_local_p (const_tree exp
)
7412 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, false, false);
7415 /* Similar to default_binds_local_p, but common symbol may be local and
7416 extern protected data is non-local. */
7419 default_binds_local_p_2 (const_tree exp
)
7421 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, true,
7426 default_binds_local_p_1 (const_tree exp
, int shlib
)
7428 return default_binds_local_p_3 (exp
, shlib
!= 0, false, false, false);
7431 /* Return true when references to DECL must bind to current definition in
7434 The condition is usually equivalent to whether the function binds to the
7435 current module (shared library or executable), that is to binds_local_p.
7436 We use this fact to avoid need for another target hook and implement
7437 the logic using binds_local_p and just special cases where
7438 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
7439 the weak definitions (that can be overwritten at linktime by other
7440 definition from different object file) and when resolution info is available
7441 we simply use the knowledge passed to us by linker plugin. */
7443 decl_binds_to_current_def_p (const_tree decl
)
7445 gcc_assert (DECL_P (decl
));
7446 if (!targetm
.binds_local_p (decl
))
7448 if (!TREE_PUBLIC (decl
))
7451 /* When resolution is available, just use it. */
7452 if (symtab_node
*node
= symtab_node::get (decl
))
7454 if (node
->resolution
!= LDPR_UNKNOWN
7455 && !node
->can_be_discarded_p ())
7456 return resolution_to_local_definition_p (node
->resolution
);
7459 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
7460 binds locally but still can be overwritten), DECL_COMMON (can be merged
7461 with a non-common definition somewhere in the same module) or
7463 This rely on fact that binds_local_p behave as decl_replaceable_p
7464 for all other declaration types. */
7465 if (DECL_WEAK (decl
))
7467 if (DECL_COMMON (decl
)
7468 && (DECL_INITIAL (decl
) == NULL
7469 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
7471 if (DECL_EXTERNAL (decl
))
7476 /* A replaceable function or variable is one which may be replaced
7477 at link-time with an entirely different definition, provided that the
7478 replacement has the same type. For example, functions declared
7479 with __attribute__((weak)) on most systems are replaceable.
7481 COMDAT functions are not replaceable, since all definitions of the
7482 function must be equivalent. It is important that COMDAT functions
7483 not be treated as replaceable so that use of C++ template
7484 instantiations is not penalized. */
7487 decl_replaceable_p (tree decl
)
7489 gcc_assert (DECL_P (decl
));
7490 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
7492 if (!flag_semantic_interposition
7493 && !DECL_WEAK (decl
))
7495 return !decl_binds_to_current_def_p (decl
);
7498 /* Default function to output code that will globalize a label. A
7499 target must define GLOBAL_ASM_OP or provide its own function to
7500 globalize a label. */
7501 #ifdef GLOBAL_ASM_OP
7503 default_globalize_label (FILE * stream
, const char *name
)
7505 fputs (GLOBAL_ASM_OP
, stream
);
7506 assemble_name (stream
, name
);
7507 putc ('\n', stream
);
7509 #endif /* GLOBAL_ASM_OP */
7511 /* Default function to output code that will globalize a declaration. */
7513 default_globalize_decl_name (FILE * stream
, tree decl
)
7515 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
7516 targetm
.asm_out
.globalize_label (stream
, name
);
7519 /* Default function to output a label for unwind information. The
7520 default is to do nothing. A target that needs nonlocal labels for
7521 unwind information must provide its own function to do this. */
7523 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
7524 tree decl ATTRIBUTE_UNUSED
,
7525 int for_eh ATTRIBUTE_UNUSED
,
7526 int empty ATTRIBUTE_UNUSED
)
7530 /* Default function to output a label to divide up the exception table.
7531 The default is to do nothing. A target that needs/wants to divide
7532 up the table must provide it's own function to do this. */
7534 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
7538 /* This is how to output an internal numbered label where PREFIX is
7539 the class of label and LABELNO is the number within the class. */
7542 default_generate_internal_label (char *buf
, const char *prefix
,
7543 unsigned long labelno
)
7545 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7548 /* This is how to output an internal numbered label where PREFIX is
7549 the class of label and LABELNO is the number within the class. */
7552 default_internal_label (FILE *stream
, const char *prefix
,
7553 unsigned long labelno
)
7555 char *const buf
= (char *) alloca (40 + strlen (prefix
));
7556 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7557 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
7561 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
7564 default_asm_declare_constant_name (FILE *file
, const char *name
,
7565 const_tree exp ATTRIBUTE_UNUSED
,
7566 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
7568 assemble_label (file
, name
);
7571 /* This is the default behavior at the beginning of a file. It's
7572 controlled by two other target-hook toggles. */
7574 default_file_start (void)
7576 if (targetm
.asm_file_start_app_off
7577 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
7578 fputs (ASM_APP_OFF
, asm_out_file
);
7580 if (targetm
.asm_file_start_file_directive
)
7582 /* LTO produced units have no meaningful main_input_filename. */
7584 output_file_directive (asm_out_file
, "<artificial>");
7586 output_file_directive (asm_out_file
, main_input_filename
);
7590 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
7591 which emits a special section directive used to indicate whether or
7592 not this object file needs an executable stack. This is primarily
7593 a GNU extension to ELF but could be used on other targets. */
7595 int trampolines_created
;
7598 file_end_indicate_exec_stack (void)
7600 unsigned int flags
= SECTION_DEBUG
;
7601 if (trampolines_created
)
7602 flags
|= SECTION_CODE
;
7604 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
7607 /* Emit a special section directive to indicate that this object file
7608 was compiled with -fsplit-stack. This is used to let the linker
7609 detect calls between split-stack code and non-split-stack code, so
7610 that it can modify the split-stack code to allocate a sufficiently
7611 large stack. We emit another special section if there are any
7612 functions in this file which have the no_split_stack attribute, to
7613 prevent the linker from warning about being unable to convert the
7614 functions if they call non-split-stack code. */
7617 file_end_indicate_split_stack (void)
7619 if (flag_split_stack
)
7621 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
7623 if (saw_no_split_stack
)
7624 switch_to_section (get_section (".note.GNU-no-split-stack",
7625 SECTION_DEBUG
, NULL
));
7629 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
7630 a get_unnamed_section callback. */
7633 output_section_asm_op (const void *directive
)
7635 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
7638 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
7639 the current section is NEW_SECTION. */
7642 switch_to_section (section
*new_section
)
7644 if (in_section
== new_section
)
7647 if (new_section
->common
.flags
& SECTION_FORGET
)
7650 in_section
= new_section
;
7652 switch (SECTION_STYLE (new_section
))
7655 targetm
.asm_out
.named_section (new_section
->named
.name
,
7656 new_section
->named
.common
.flags
,
7657 new_section
->named
.decl
);
7660 case SECTION_UNNAMED
:
7661 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
7664 case SECTION_NOSWITCH
:
7669 new_section
->common
.flags
|= SECTION_DECLARED
;
7672 /* If block symbol SYMBOL has not yet been assigned an offset, place
7673 it at the end of its block. */
7676 place_block_symbol (rtx symbol
)
7678 unsigned HOST_WIDE_INT size
, mask
, offset
;
7679 class constant_descriptor_rtx
*desc
;
7680 unsigned int alignment
;
7681 struct object_block
*block
;
7684 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7685 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7688 /* Work out the symbol's size and alignment. */
7689 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7691 desc
= SYMBOL_REF_CONSTANT (symbol
);
7692 alignment
= desc
->align
;
7693 size
= GET_MODE_SIZE (desc
->mode
);
7695 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7697 decl
= SYMBOL_REF_DECL (symbol
);
7698 gcc_checking_assert (DECL_IN_CONSTANT_POOL (decl
));
7699 alignment
= DECL_ALIGN (decl
);
7700 size
= get_constant_size (DECL_INITIAL (decl
));
7701 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7702 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7703 && asan_protect_global (DECL_INITIAL (decl
)))
7705 size
+= asan_red_zone_size (size
);
7706 alignment
= MAX (alignment
,
7707 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7712 struct symtab_node
*snode
;
7713 decl
= SYMBOL_REF_DECL (symbol
);
7715 snode
= symtab_node::get (decl
);
7718 rtx target
= DECL_RTL (snode
->ultimate_alias_target ()->decl
);
7720 gcc_assert (MEM_P (target
)
7721 && GET_CODE (XEXP (target
, 0)) == SYMBOL_REF
7722 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (target
, 0)));
7723 target
= XEXP (target
, 0);
7724 place_block_symbol (target
);
7725 SYMBOL_REF_BLOCK_OFFSET (symbol
) = SYMBOL_REF_BLOCK_OFFSET (target
);
7728 alignment
= get_variable_align (decl
);
7729 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7730 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7731 && asan_protect_global (decl
))
7733 size
+= asan_red_zone_size (size
);
7734 alignment
= MAX (alignment
,
7735 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7739 /* Calculate the object's offset from the start of the block. */
7740 block
= SYMBOL_REF_BLOCK (symbol
);
7741 mask
= alignment
/ BITS_PER_UNIT
- 1;
7742 offset
= (block
->size
+ mask
) & ~mask
;
7743 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7745 /* Record the block's new alignment and size. */
7746 block
->alignment
= MAX (block
->alignment
, alignment
);
7747 block
->size
= offset
+ size
;
7749 vec_safe_push (block
->objects
, symbol
);
7752 /* Return the anchor that should be used to address byte offset OFFSET
7753 from the first object in BLOCK. MODEL is the TLS model used
7757 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7758 enum tls_model model
)
7761 unsigned int begin
, middle
, end
;
7762 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7765 /* Work out the anchor's offset. Use an offset of 0 for the first
7766 anchor so that we don't pessimize the case where we take the address
7767 of a variable at the beginning of the block. This is particularly
7768 useful when a block has only one variable assigned to it.
7770 We try to place anchors RANGE bytes apart, so there can then be
7771 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7772 a ptr_mode offset. With some target settings, the lowest such
7773 anchor might be out of range for the lowest ptr_mode offset;
7774 likewise the highest anchor for the highest offset. Use anchors
7775 at the extreme ends of the ptr_mode range in such cases.
7777 All arithmetic uses unsigned integers in order to avoid
7779 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7780 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7781 range
= max_offset
- min_offset
+ 1;
7786 bias
= HOST_WIDE_INT_1U
<< (GET_MODE_BITSIZE (ptr_mode
) - 1);
7789 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7790 delta
-= delta
% range
;
7793 offset
= (HOST_WIDE_INT
) (-delta
);
7797 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7798 delta
-= delta
% range
;
7799 if (delta
> bias
- 1)
7801 offset
= (HOST_WIDE_INT
) delta
;
7805 /* Do a binary search to see if there's already an anchor we can use.
7806 Set BEGIN to the new anchor's index if not. */
7808 end
= vec_safe_length (block
->anchors
);
7809 while (begin
!= end
)
7811 middle
= (end
+ begin
) / 2;
7812 anchor
= (*block
->anchors
)[middle
];
7813 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7815 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7817 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7819 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7825 /* Create a new anchor with a unique label. */
7826 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7827 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7828 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7829 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7831 /* Insert it at index BEGIN. */
7832 vec_safe_insert (block
->anchors
, begin
, anchor
);
7836 /* Output the objects in BLOCK. */
7839 output_object_block (struct object_block
*block
)
7841 class constant_descriptor_rtx
*desc
;
7843 HOST_WIDE_INT offset
;
7847 if (!block
->objects
)
7850 /* Switch to the section and make sure that the first byte is
7851 suitably aligned. */
7852 /* Special case VTV comdat sections similar to assemble_variable. */
7853 if (SECTION_STYLE (block
->sect
) == SECTION_NAMED
7854 && block
->sect
->named
.name
7855 && (strcmp (block
->sect
->named
.name
, ".vtable_map_vars") == 0))
7856 handle_vtv_comdat_section (block
->sect
, block
->sect
->named
.decl
);
7858 switch_to_section (block
->sect
);
7860 gcc_checking_assert (!(block
->sect
->common
.flags
& SECTION_MERGE
));
7861 assemble_align (block
->alignment
);
7863 /* Define the values of all anchors relative to the current section
7865 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7866 targetm
.asm_out
.output_anchor (symbol
);
7868 /* Output the objects themselves. */
7870 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7872 /* Move to the object's offset, padding with zeros if necessary. */
7873 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7874 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7875 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7877 desc
= SYMBOL_REF_CONSTANT (symbol
);
7878 /* Pass 1 for align as we have already laid out everything in the block.
7879 So aligning shouldn't be necessary. */
7880 output_constant_pool_1 (desc
, 1);
7881 offset
+= GET_MODE_SIZE (desc
->mode
);
7883 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7886 decl
= SYMBOL_REF_DECL (symbol
);
7887 assemble_constant_contents (DECL_INITIAL (decl
), XSTR (symbol
, 0),
7888 DECL_ALIGN (decl
), false);
7890 size
= get_constant_size (DECL_INITIAL (decl
));
7892 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7893 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7894 && asan_protect_global (DECL_INITIAL (decl
)))
7896 size
= asan_red_zone_size (size
);
7897 assemble_zeros (size
);
7904 decl
= SYMBOL_REF_DECL (symbol
);
7905 assemble_variable_contents (decl
, XSTR (symbol
, 0), false, false);
7906 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7908 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7909 && asan_protect_global (decl
))
7911 size
= asan_red_zone_size (size
);
7912 assemble_zeros (size
);
7919 /* A callback for qsort to compare object_blocks. */
7922 output_object_block_compare (const void *x
, const void *y
)
7924 object_block
*p1
= *(object_block
* const*)x
;
7925 object_block
*p2
= *(object_block
* const*)y
;
7927 if (p1
->sect
->common
.flags
& SECTION_NAMED
7928 && !(p2
->sect
->common
.flags
& SECTION_NAMED
))
7931 if (!(p1
->sect
->common
.flags
& SECTION_NAMED
)
7932 && p2
->sect
->common
.flags
& SECTION_NAMED
)
7935 if (p1
->sect
->common
.flags
& SECTION_NAMED
7936 && p2
->sect
->common
.flags
& SECTION_NAMED
)
7937 return strcmp (p1
->sect
->named
.name
, p2
->sect
->named
.name
);
7939 unsigned f1
= p1
->sect
->common
.flags
;
7940 unsigned f2
= p2
->sect
->common
.flags
;
7943 return f1
< f2
? -1 : 1;
7946 /* Output the definitions of all object_blocks. */
7949 output_object_blocks (void)
7951 vec
<object_block
*, va_heap
> v
;
7952 v
.create (object_block_htab
->elements ());
7954 hash_table
<object_block_hasher
>::iterator hi
;
7956 FOR_EACH_HASH_TABLE_ELEMENT (*object_block_htab
, obj
, object_block
*, hi
)
7959 /* Sort them in order to output them in a deterministic manner,
7960 otherwise we may get .rodata sections in different orders with
7962 v
.qsort (output_object_block_compare
);
7964 FOR_EACH_VEC_ELT (v
, i
, obj
)
7965 output_object_block (obj
);
7970 /* This function provides a possible implementation of the
7971 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7972 by -frecord-gcc-switches it creates a new mergeable, string section in the
7973 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7974 contains the switches in ASCII format.
7976 FIXME: This code does not correctly handle double quote characters
7977 that appear inside strings, (it strips them rather than preserving them).
7978 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7979 characters - instead it treats them as sub-string separators. Since
7980 we want to emit NUL strings terminators into the object file we have to use
7984 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7988 case SWITCH_TYPE_PASSED
:
7989 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7990 ASM_OUTPUT_SKIP (asm_out_file
, HOST_WIDE_INT_1U
);
7993 case SWITCH_TYPE_DESCRIPTIVE
:
7996 /* Distinguish between invocations where name is NULL. */
7997 static bool started
= false;
8003 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
8007 | (SECTION_ENTSIZE
& 1),
8009 switch_to_section (sec
);
8018 /* The return value is currently ignored by the caller, but must be 0.
8019 For -fverbose-asm the return value would be the number of characters
8020 emitted into the assembler file. */
8024 /* Emit text to declare externally defined symbols. It is needed to
8025 properly support non-default visibility. */
8027 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
8029 const char *name ATTRIBUTE_UNUSED
)
8031 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
8032 set in order to avoid putting out names that are never really
8033 used. Always output visibility specified in the source. */
8034 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
8035 && (DECL_VISIBILITY_SPECIFIED (decl
)
8036 || targetm
.binds_local_p (decl
)))
8037 maybe_assemble_visibility (decl
);
8040 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
8043 default_asm_output_source_filename (FILE *file
, const char *name
)
8045 #ifdef ASM_OUTPUT_SOURCE_FILENAME
8046 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
8048 fprintf (file
, "\t.file\t");
8049 output_quoted_string (file
, name
);
8054 /* Output a file name in the form wanted by System V. */
8057 output_file_directive (FILE *asm_file
, const char *input_name
)
8062 if (input_name
== NULL
)
8063 input_name
= "<stdin>";
8065 input_name
= remap_debug_filename (input_name
);
8067 len
= strlen (input_name
);
8068 na
= input_name
+ len
;
8070 /* NA gets INPUT_NAME sans directory names. */
8071 while (na
> input_name
)
8073 if (IS_DIR_SEPARATOR (na
[-1]))
8078 targetm
.asm_out
.output_source_filename (asm_file
, na
);
8081 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
8084 make_debug_expr_from_rtl (const_rtx exp
)
8086 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
8087 machine_mode mode
= GET_MODE (exp
);
8090 DECL_ARTIFICIAL (ddecl
) = 1;
8091 if (REG_P (exp
) && REG_EXPR (exp
))
8092 type
= TREE_TYPE (REG_EXPR (exp
));
8093 else if (MEM_P (exp
) && MEM_EXPR (exp
))
8094 type
= TREE_TYPE (MEM_EXPR (exp
));
8097 if (type
&& TYPE_MODE (type
) == mode
)
8098 TREE_TYPE (ddecl
) = type
;
8100 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
8101 SET_DECL_MODE (ddecl
, mode
);
8102 dval
= gen_rtx_DEBUG_EXPR (mode
);
8103 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
8104 SET_DECL_RTL (ddecl
, dval
);
8108 #ifdef ELF_ASCII_ESCAPES
8109 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
8112 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
8117 fputs (STRING_ASM_OP
, f
);
8122 escape
= ELF_ASCII_ESCAPES
[c
];
8130 putc ('0'+((c
>>6)&7), f
);
8131 putc ('0'+((c
>>3)&7), f
);
8132 putc ('0'+(c
&7), f
);
8145 /* Default ASM_OUTPUT_ASCII for ELF targets. */
8148 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
8150 const char *limit
= s
+ len
;
8151 const char *last_null
= NULL
;
8152 unsigned bytes_in_chunk
= 0;
8156 for (; s
< limit
; s
++)
8160 if (bytes_in_chunk
>= 60)
8169 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
8176 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
8178 if (bytes_in_chunk
> 0)
8185 default_elf_asm_output_limited_string (f
, s
);
8190 if (bytes_in_chunk
== 0)
8191 fputs (ASCII_DATA_ASM_OP
"\"", f
);
8194 escape
= ELF_ASCII_ESCAPES
[c
];
8203 putc ('0'+((c
>>6)&7), f
);
8204 putc ('0'+((c
>>3)&7), f
);
8205 putc ('0'+(c
&7), f
);
8206 bytes_in_chunk
+= 4;
8211 bytes_in_chunk
+= 2;
8218 if (bytes_in_chunk
> 0)
8226 static GTY(()) section
*elf_init_array_section
;
8227 static GTY(()) section
*elf_fini_array_section
;
8230 get_elf_initfini_array_priority_section (int priority
,
8234 if (priority
!= DEFAULT_INIT_PRIORITY
)
8237 sprintf (buf
, "%s.%.5u",
8238 constructor_p
? ".init_array" : ".fini_array",
8240 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
8246 if (elf_init_array_section
== NULL
)
8247 elf_init_array_section
8248 = get_section (".init_array",
8249 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
8250 sec
= elf_init_array_section
;
8254 if (elf_fini_array_section
== NULL
)
8255 elf_fini_array_section
8256 = get_section (".fini_array",
8257 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
8258 sec
= elf_fini_array_section
;
8264 /* Use .init_array section for constructors. */
8267 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
8269 section
*sec
= get_elf_initfini_array_priority_section (priority
,
8271 assemble_addr_to_section (symbol
, sec
);
8274 /* Use .fini_array section for destructors. */
8277 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
8279 section
*sec
= get_elf_initfini_array_priority_section (priority
,
8281 assemble_addr_to_section (symbol
, sec
);
8284 /* Default TARGET_ASM_OUTPUT_IDENT hook.
8286 This is a bit of a cheat. The real default is a no-op, but this
8287 hook is the default for all targets with a .ident directive. */
8290 default_asm_output_ident_directive (const char *ident_str
)
8292 const char *ident_asm_op
= "\t.ident\t";
8294 /* If we are still in the front end, do not write out the string
8295 to asm_out_file. Instead, add a fake top-level asm statement.
8296 This allows the front ends to use this hook without actually
8297 writing to asm_out_file, to handle #ident or Pragma Ident. */
8298 if (symtab
->state
== PARSING
)
8300 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
8301 symtab
->finalize_toplevel_asm (build_string (strlen (buf
), buf
));
8304 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
8308 /* This function ensures that vtable_map variables are not only
8309 in the comdat section, but that each variable has its own unique
8310 comdat name. Without this the variables end up in the same section
8311 with a single comdat name.
8313 FIXME: resolve_unique_section needs to deal better with
8314 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
8315 that is fixed, this if-else statement can be replaced with
8316 a single call to "switch_to_section (sect)". */
8319 handle_vtv_comdat_section (section
*sect
, const_tree decl ATTRIBUTE_UNUSED
)
8321 #if defined (OBJECT_FORMAT_ELF)
8322 targetm
.asm_out
.named_section (sect
->named
.name
,
8323 sect
->named
.common
.flags
8328 /* Neither OBJECT_FORMAT_PE, nor OBJECT_FORMAT_COFF is set here.
8329 Therefore the following check is used.
8330 In case a the target is PE or COFF a comdat group section
8331 is created, e.g. .vtable_map_vars$foo. The linker places
8332 everything in .vtable_map_vars at the end.
8334 A fix could be made in
8335 gcc/config/i386/winnt.c: i386_pe_unique_section. */
8340 if (TREE_CODE (DECL_NAME (decl
)) == IDENTIFIER_NODE
)
8341 name
= ACONCAT ((sect
->named
.name
, "$",
8342 IDENTIFIER_POINTER (DECL_NAME (decl
)), NULL
));
8344 name
= ACONCAT ((sect
->named
.name
, "$",
8345 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (DECL_NAME (decl
))),
8348 targetm
.asm_out
.named_section (name
,
8349 sect
->named
.common
.flags
8355 switch_to_section (sect
);
8359 #include "gt-varasm.h"