1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987-2019 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"
51 #include "langhooks.h"
53 #include "common/common-target.h"
54 #include "stringpool.h"
58 #include "file-prefix-map.h" /* remap_debug_filename() */
60 #ifdef XCOFF_DEBUGGING_INFO
61 #include "xcoffout.h" /* Needed for external data declarations. */
64 /* The (assembler) name of the first globally-visible object output. */
65 extern GTY(()) const char *first_global_object_name
;
66 extern GTY(()) const char *weak_global_object_name
;
68 const char *first_global_object_name
;
69 const char *weak_global_object_name
;
72 struct constant_descriptor_rtx
;
73 struct rtx_constant_pool
;
75 #define n_deferred_constants (crtl->varasm.deferred_constants)
77 /* Number for making the label on the next
78 constant that is stored in memory. */
80 static GTY(()) int const_labelno
;
82 /* Carry information from ASM_DECLARE_OBJECT_NAME
83 to ASM_FINISH_DECLARE_OBJECT. */
85 int size_directive_output
;
87 /* The last decl for which assemble_variable was called,
88 if it did ASM_DECLARE_OBJECT_NAME.
89 If the last call to assemble_variable didn't do that,
92 tree last_assemble_variable_decl
;
94 /* The following global variable indicates if the first basic block
95 in a function belongs to the cold partition or not. */
97 bool first_function_block_is_cold
;
99 /* Whether we saw any functions with no_split_stack. */
101 static bool saw_no_split_stack
;
103 static const char *strip_reg_name (const char *);
104 static int contains_pointers_p (tree
);
105 #ifdef ASM_OUTPUT_EXTERNAL
106 static bool incorporeal_function_p (tree
);
108 static void decode_addr_const (tree
, struct addr_const
*);
109 static hashval_t
const_hash_1 (const tree
);
110 static int compare_constant (const tree
, const tree
);
111 static void output_constant_def_contents (rtx
);
112 static void output_addressed_constants (tree
);
113 static unsigned HOST_WIDE_INT
output_constant (tree
, unsigned HOST_WIDE_INT
,
114 unsigned int, bool, bool);
115 static void globalize_decl (tree
);
116 static bool decl_readonly_section_1 (enum section_category
);
117 #ifdef BSS_SECTION_ASM_OP
118 #ifdef ASM_OUTPUT_ALIGNED_BSS
119 static void asm_output_aligned_bss (FILE *, tree
, const char *,
120 unsigned HOST_WIDE_INT
, int)
123 #endif /* BSS_SECTION_ASM_OP */
124 static void mark_weak (tree
);
125 static void output_constant_pool (const char *, tree
);
126 static void handle_vtv_comdat_section (section
*, const_tree
);
128 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
129 section
*text_section
;
130 section
*data_section
;
131 section
*readonly_data_section
;
132 section
*sdata_section
;
133 section
*ctors_section
;
134 section
*dtors_section
;
135 section
*bss_section
;
136 section
*sbss_section
;
138 /* Various forms of common section. All are guaranteed to be nonnull. */
139 section
*tls_comm_section
;
140 section
*comm_section
;
141 section
*lcomm_section
;
143 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
145 section
*bss_noswitch_section
;
147 /* The section that holds the main exception table, when known. The section
148 is set either by the target's init_sections hook or by the first call to
149 switch_to_exception_section. */
150 section
*exception_section
;
152 /* The section that holds the DWARF2 frame unwind information, when known.
153 The section is set either by the target's init_sections hook or by the
154 first call to switch_to_eh_frame_section. */
155 section
*eh_frame_section
;
157 /* asm_out_file's current section. This is NULL if no section has yet
158 been selected or if we lose track of what the current section is. */
161 /* True if code for the current function is currently being directed
162 at the cold section. */
163 bool in_cold_section_p
;
165 /* The following global holds the "function name" for the code in the
166 cold section of a function, if hot/cold function splitting is enabled
167 and there was actually code that went into the cold section. A
168 pseudo function name is needed for the cold section of code for some
169 debugging tools that perform symbolization. */
170 tree cold_function_name
= NULL_TREE
;
172 /* A linked list of all the unnamed sections. */
173 static GTY(()) section
*unnamed_sections
;
175 /* Return a nonzero value if DECL has a section attribute. */
176 #define IN_NAMED_SECTION(DECL) \
177 (VAR_OR_FUNCTION_DECL_P (DECL) && DECL_SECTION_NAME (DECL) != NULL)
179 struct section_hasher
: ggc_ptr_hash
<section
>
181 typedef const char *compare_type
;
183 static hashval_t
hash (section
*);
184 static bool equal (section
*, const char *);
187 /* Hash table of named sections. */
188 static GTY(()) hash_table
<section_hasher
> *section_htab
;
190 struct object_block_hasher
: ggc_ptr_hash
<object_block
>
192 typedef const section
*compare_type
;
194 static hashval_t
hash (object_block
*);
195 static bool equal (object_block
*, const section
*);
198 /* A table of object_blocks, indexed by section. */
199 static GTY(()) hash_table
<object_block_hasher
> *object_block_htab
;
201 /* The next number to use for internal anchor labels. */
202 static GTY(()) int anchor_labelno
;
204 /* A pool of constants that can be shared between functions. */
205 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
207 /* Helper routines for maintaining section_htab. */
210 section_hasher::equal (section
*old
, const char *new_name
)
212 return strcmp (old
->named
.name
, new_name
) == 0;
216 section_hasher::hash (section
*old
)
218 return htab_hash_string (old
->named
.name
);
221 /* Return a hash value for section SECT. */
224 hash_section (section
*sect
)
226 if (sect
->common
.flags
& SECTION_NAMED
)
227 return htab_hash_string (sect
->named
.name
);
228 return sect
->common
.flags
& ~SECTION_DECLARED
;
231 /* Helper routines for maintaining object_block_htab. */
234 object_block_hasher::equal (object_block
*old
, const section
*new_section
)
236 return old
->sect
== new_section
;
240 object_block_hasher::hash (object_block
*old
)
242 return hash_section (old
->sect
);
245 /* Return a new unnamed section with the given fields. */
248 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
253 sect
= ggc_alloc
<section
> ();
254 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
255 sect
->unnamed
.callback
= callback
;
256 sect
->unnamed
.data
= data
;
257 sect
->unnamed
.next
= unnamed_sections
;
259 unnamed_sections
= sect
;
263 /* Return a SECTION_NOSWITCH section with the given fields. */
266 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
270 sect
= ggc_alloc
<section
> ();
271 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
272 sect
->noswitch
.callback
= callback
;
277 /* Return the named section structure associated with NAME. Create
278 a new section with the given fields if no such structure exists. */
281 get_section (const char *name
, unsigned int flags
, tree decl
)
283 section
*sect
, **slot
;
285 slot
= section_htab
->find_slot_with_hash (name
, htab_hash_string (name
),
287 flags
|= SECTION_NAMED
;
290 sect
= ggc_alloc
<section
> ();
291 sect
->named
.common
.flags
= flags
;
292 sect
->named
.name
= ggc_strdup (name
);
293 sect
->named
.decl
= decl
;
299 /* It is fine if one of the sections has SECTION_NOTYPE as long as
300 the other has none of the contrary flags (see the logic at the end
301 of default_section_type_flags, below). */
302 if (((sect
->common
.flags
^ flags
) & SECTION_NOTYPE
)
303 && !((sect
->common
.flags
| flags
)
304 & (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
| SECTION_ENTSIZE
305 | (HAVE_COMDAT_GROUP
? SECTION_LINKONCE
: 0))))
307 sect
->common
.flags
|= SECTION_NOTYPE
;
308 flags
|= SECTION_NOTYPE
;
310 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
311 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
313 /* It is fine if one of the section flags is
314 SECTION_WRITE | SECTION_RELRO and the other has none of these
315 flags (i.e. read-only) in named sections and either the
316 section hasn't been declared yet or has been declared as writable.
317 In that case just make sure the resulting flags are
318 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
320 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
321 == (SECTION_WRITE
| SECTION_RELRO
)
322 && (sect
->common
.flags
323 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
324 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
325 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
326 || (sect
->common
.flags
& SECTION_WRITE
)))
328 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
331 /* Sanity check user variables for flag changes. */
332 if (sect
->named
.decl
!= NULL
333 && DECL_P (sect
->named
.decl
)
334 && decl
!= sect
->named
.decl
)
336 if (decl
!= NULL
&& DECL_P (decl
))
337 error ("%+qD causes a section type conflict with %qD",
338 decl
, sect
->named
.decl
);
340 error ("section type conflict with %qD", sect
->named
.decl
);
341 inform (DECL_SOURCE_LOCATION (sect
->named
.decl
),
342 "%qD was declared here", sect
->named
.decl
);
344 else if (decl
!= NULL
&& DECL_P (decl
))
345 error ("%+qD causes a section type conflict", decl
);
347 error ("section type conflict");
348 /* Make sure we don't error about one section multiple times. */
349 sect
->common
.flags
|= SECTION_OVERRIDE
;
355 /* Return true if the current compilation mode benefits from having
356 objects grouped into blocks. */
359 use_object_blocks_p (void)
361 return flag_section_anchors
;
364 /* Return the object_block structure for section SECT. Create a new
365 structure if we haven't created one already. Return null if SECT
366 itself is null. Return also null for mergeable sections since
367 section anchors can't be used in mergeable sections anyway,
368 because the linker might move objects around, and using the
369 object blocks infrastructure in that case is both a waste and a
370 maintenance burden. */
372 static struct object_block
*
373 get_block_for_section (section
*sect
)
375 struct object_block
*block
;
380 if (sect
->common
.flags
& SECTION_MERGE
)
384 = object_block_htab
->find_slot_with_hash (sect
, hash_section (sect
),
389 block
= ggc_cleared_alloc
<object_block
> ();
396 /* Create a symbol with label LABEL and place it at byte offset
397 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
398 is not yet known. LABEL must be a garbage-collected string. */
401 create_block_symbol (const char *label
, struct object_block
*block
,
402 HOST_WIDE_INT offset
)
407 /* Create the extended SYMBOL_REF. */
408 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
409 symbol
= (rtx
) ggc_internal_alloc (size
);
411 /* Initialize the normal SYMBOL_REF fields. */
412 memset (symbol
, 0, size
);
413 PUT_CODE (symbol
, SYMBOL_REF
);
414 PUT_MODE (symbol
, Pmode
);
415 XSTR (symbol
, 0) = label
;
416 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
418 /* Initialize the block_symbol stuff. */
419 SYMBOL_REF_BLOCK (symbol
) = block
;
420 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
425 /* Return a section with a particular name and with whatever SECTION_*
426 flags section_type_flags deems appropriate. The name of the section
427 is taken from NAME if nonnull, otherwise it is taken from DECL's
428 DECL_SECTION_NAME. DECL is the decl associated with the section
429 (see the section comment for details) and RELOC is as for
430 section_type_flags. */
433 get_named_section (tree decl
, const char *name
, int reloc
)
439 gcc_assert (decl
&& DECL_P (decl
) && DECL_SECTION_NAME (decl
));
440 name
= DECL_SECTION_NAME (decl
);
443 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
444 return get_section (name
, flags
, decl
);
447 /* Worker for resolve_unique_section. */
450 set_implicit_section (struct symtab_node
*n
, void *data ATTRIBUTE_UNUSED
)
452 n
->implicit_section
= true;
456 /* If required, set DECL_SECTION_NAME to a unique name. */
459 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
460 int flag_function_or_data_sections
)
462 if (DECL_SECTION_NAME (decl
) == NULL
463 && targetm_common
.have_named_sections
464 && (flag_function_or_data_sections
465 || DECL_COMDAT_GROUP (decl
)))
467 targetm
.asm_out
.unique_section (decl
, reloc
);
468 if (DECL_SECTION_NAME (decl
))
469 symtab_node::get (decl
)->call_for_symbol_and_aliases
470 (set_implicit_section
, NULL
, true);
474 #ifdef BSS_SECTION_ASM_OP
476 #ifdef ASM_OUTPUT_ALIGNED_BSS
478 /* Utility function for targets to use in implementing
479 ASM_OUTPUT_ALIGNED_BSS.
480 ??? It is believed that this function will work in most cases so such
481 support is localized here. */
484 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
485 const char *name
, unsigned HOST_WIDE_INT size
,
488 switch_to_section (bss_section
);
489 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
490 #ifdef ASM_DECLARE_OBJECT_NAME
491 last_assemble_variable_decl
= decl
;
492 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
494 /* Standard thing is just output label for the object. */
495 ASM_OUTPUT_LABEL (file
, name
);
496 #endif /* ASM_DECLARE_OBJECT_NAME */
497 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
502 #endif /* BSS_SECTION_ASM_OP */
504 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
505 /* Return the hot section for function DECL. Return text_section for
509 hot_function_section (tree decl
)
511 if (decl
!= NULL_TREE
512 && DECL_SECTION_NAME (decl
) != NULL
513 && targetm_common
.have_named_sections
)
514 return get_named_section (decl
, NULL
, 0);
520 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
523 When DECL_SECTION_NAME is non-NULL and it is implicit section and
524 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
525 concatenate the name with NAMED_SECTION_SUFFIX.
526 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
529 get_named_text_section (tree decl
,
530 const char *text_section_name
,
531 const char *named_section_suffix
)
533 if (decl
&& DECL_SECTION_NAME (decl
))
535 if (named_section_suffix
)
537 const char *dsn
= DECL_SECTION_NAME (decl
);
538 const char *stripped_name
;
541 name
= (char *) alloca (strlen (dsn
) + 1);
545 stripped_name
= targetm
.strip_name_encoding (name
);
547 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
548 return get_named_section (decl
, buffer
, 0);
550 else if (symtab_node::get (decl
)->implicit_section
)
554 /* Do not try to split gnu_linkonce functions. This gets somewhat
556 if (DECL_COMDAT_GROUP (decl
) && !HAVE_COMDAT_GROUP
)
558 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
559 name
= targetm
.strip_name_encoding (name
);
560 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
566 return get_named_section (decl
, text_section_name
, 0);
569 /* Choose named function section based on its frequency. */
572 default_function_section (tree decl
, enum node_frequency freq
,
573 bool startup
, bool exit
)
575 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
576 /* Old GNU linkers have buggy --gc-section support, which sometimes
577 results in .gcc_except_table* sections being garbage collected. */
579 && symtab_node::get (decl
)->implicit_section
)
583 if (!flag_reorder_functions
584 || !targetm_common
.have_named_sections
)
586 /* Startup code should go to startup subsection unless it is
587 unlikely executed (this happens especially with function splitting
588 where we can split away unnecessary parts of static constructors. */
589 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
591 /* If we do have a profile or(and) LTO phase is executed, we do not need
592 these ELF section. */
593 if (!in_lto_p
|| !flag_profile_values
)
594 return get_named_text_section (decl
, ".text.startup", NULL
);
599 /* Similarly for exit. */
600 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
601 return get_named_text_section (decl
, ".text.exit", NULL
);
603 /* Group cold functions together, similarly for hot code. */
606 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
607 return get_named_text_section (decl
, ".text.unlikely", NULL
);
608 case NODE_FREQUENCY_HOT
:
609 /* If we do have a profile or(and) LTO phase is executed, we do not need
610 these ELF section. */
611 if (!in_lto_p
|| !flag_profile_values
)
612 return get_named_text_section (decl
, ".text.hot", NULL
);
619 /* Return the section for function DECL.
621 If DECL is NULL_TREE, return the text section. We can be passed
622 NULL_TREE under some circumstances by dbxout.c at least.
624 If FORCE_COLD is true, return cold function section ignoring
625 the frequency info of cgraph_node. */
628 function_section_1 (tree decl
, bool force_cold
)
630 section
*section
= NULL
;
631 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
632 bool startup
= false, exit
= false;
636 struct cgraph_node
*node
= cgraph_node::get (decl
);
640 freq
= node
->frequency
;
641 startup
= node
->only_called_at_startup
;
642 exit
= node
->only_called_at_exit
;
646 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
648 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
649 if (decl
!= NULL_TREE
650 && DECL_SECTION_NAME (decl
) != NULL
)
652 if (targetm
.asm_out
.function_section
)
653 section
= targetm
.asm_out
.function_section (decl
, freq
,
657 return get_named_section (decl
, NULL
, 0);
660 return targetm
.asm_out
.select_section
661 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
662 symtab_node::get (decl
)->definition_alignment ());
664 if (targetm
.asm_out
.function_section
)
665 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
668 return hot_function_section (decl
);
672 /* Return the section for function DECL.
674 If DECL is NULL_TREE, return the text section. We can be passed
675 NULL_TREE under some circumstances by dbxout.c at least. */
678 function_section (tree decl
)
680 /* Handle cases where function splitting code decides
681 to put function entry point into unlikely executed section
682 despite the fact that the function itself is not cold
683 (i.e. it is called rarely but contains a hot loop that is
684 better to live in hot subsection for the code locality). */
685 return function_section_1 (decl
,
686 first_function_block_is_cold
);
689 /* Return the section for the current function, take IN_COLD_SECTION_P
693 current_function_section (void)
695 return function_section_1 (current_function_decl
, in_cold_section_p
);
698 /* Tell assembler to switch to unlikely-to-be-executed text section. */
701 unlikely_text_section (void)
703 return function_section_1 (current_function_decl
, true);
706 /* When called within a function context, return true if the function
707 has been assigned a cold text section and if SECT is that section.
708 When called outside a function context, return true if SECT is the
709 default cold section. */
712 unlikely_text_section_p (section
*sect
)
714 return sect
== function_section_1 (current_function_decl
, true);
717 /* Switch to the other function partition (if inside of hot section
718 into cold section, otherwise into the hot section). */
721 switch_to_other_text_partition (void)
723 in_cold_section_p
= !in_cold_section_p
;
724 switch_to_section (current_function_section ());
727 /* Return the read-only data section associated with function DECL. */
730 default_function_rodata_section (tree decl
)
732 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
734 const char *name
= DECL_SECTION_NAME (decl
);
736 if (DECL_COMDAT_GROUP (decl
) && HAVE_COMDAT_GROUP
)
742 dot
= strchr (name
+ 1, '.');
745 len
= strlen (dot
) + 8;
746 rname
= (char *) alloca (len
);
748 strcpy (rname
, ".rodata");
750 return get_section (rname
, SECTION_LINKONCE
, decl
);
752 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
753 else if (DECL_COMDAT_GROUP (decl
)
754 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
756 size_t len
= strlen (name
) + 1;
757 char *rname
= (char *) alloca (len
);
759 memcpy (rname
, name
, len
);
761 return get_section (rname
, SECTION_LINKONCE
, decl
);
763 /* For .text.foo we want to use .rodata.foo. */
764 else if (flag_function_sections
&& flag_data_sections
765 && strncmp (name
, ".text.", 6) == 0)
767 size_t len
= strlen (name
) + 1;
768 char *rname
= (char *) alloca (len
+ 2);
770 memcpy (rname
, ".rodata", 7);
771 memcpy (rname
+ 7, name
+ 5, len
- 5);
772 return get_section (rname
, 0, decl
);
776 return readonly_data_section
;
779 /* Return the read-only data section associated with function DECL
780 for targets where that section should be always the single
781 readonly data section. */
784 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
786 return readonly_data_section
;
789 /* A subroutine of mergeable_string_section and mergeable_constant_section. */
792 function_mergeable_rodata_prefix (void)
794 section
*s
= targetm
.asm_out
.function_rodata_section (current_function_decl
);
795 if (SECTION_STYLE (s
) == SECTION_NAMED
)
796 return s
->named
.name
;
798 return targetm
.asm_out
.mergeable_rodata_prefix
;
801 /* Return the section to use for string merging. */
804 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
805 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
806 unsigned int flags ATTRIBUTE_UNUSED
)
810 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
811 && TREE_CODE (decl
) == STRING_CST
812 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
814 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
815 && TREE_STRING_LENGTH (decl
) == len
)
817 scalar_int_mode mode
;
818 unsigned int modesize
;
822 const char *prefix
= function_mergeable_rodata_prefix ();
823 char *name
= (char *) alloca (strlen (prefix
) + 30);
825 mode
= SCALAR_INT_TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
826 modesize
= GET_MODE_BITSIZE (mode
);
827 if (modesize
>= 8 && modesize
<= 256
828 && (modesize
& (modesize
- 1)) == 0)
830 if (align
< modesize
)
833 if (!HAVE_LD_ALIGNED_SHF_MERGE
&& align
> 8)
834 return readonly_data_section
;
836 str
= TREE_STRING_POINTER (decl
);
837 unit
= GET_MODE_SIZE (mode
);
839 /* Check for embedded NUL characters. */
840 for (i
= 0; i
< len
; i
+= unit
)
842 for (j
= 0; j
< unit
; j
++)
843 if (str
[i
+ j
] != '\0')
848 if (i
== len
- unit
|| (unit
== 1 && i
== len
))
850 sprintf (name
, "%s.str%d.%d", prefix
,
851 modesize
/ 8, (int) (align
/ 8));
852 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
853 return get_section (name
, flags
, NULL
);
858 return readonly_data_section
;
861 /* Return the section to use for constant merging. */
864 mergeable_constant_section (machine_mode mode ATTRIBUTE_UNUSED
,
865 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
866 unsigned int flags ATTRIBUTE_UNUSED
)
868 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
871 && known_le (GET_MODE_BITSIZE (mode
), align
)
874 && (align
& (align
- 1)) == 0
875 && (HAVE_LD_ALIGNED_SHF_MERGE
? 1 : align
== 8))
877 const char *prefix
= function_mergeable_rodata_prefix ();
878 char *name
= (char *) alloca (strlen (prefix
) + 30);
880 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
881 flags
|= (align
/ 8) | SECTION_MERGE
;
882 return get_section (name
, flags
, NULL
);
884 return readonly_data_section
;
887 /* Given NAME, a putative register name, discard any customary prefixes. */
890 strip_reg_name (const char *name
)
892 #ifdef REGISTER_PREFIX
893 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
894 name
+= strlen (REGISTER_PREFIX
);
896 if (name
[0] == '%' || name
[0] == '#')
901 /* The user has asked for a DECL to have a particular name. Set (or
902 change) it in such a way that we don't prefix an underscore to
905 set_user_assembler_name (tree decl
, const char *name
)
907 char *starred
= (char *) alloca (strlen (name
) + 2);
909 strcpy (starred
+ 1, name
);
910 symtab
->change_decl_assembler_name (decl
, get_identifier (starred
));
911 SET_DECL_RTL (decl
, NULL_RTX
);
914 /* Decode an `asm' spec for a declaration as a register name.
915 Return the register number, or -1 if nothing specified,
916 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
917 or -3 if ASMSPEC is `cc' and is not recognized,
918 or -4 if ASMSPEC is `memory' and is not recognized.
919 Accept an exact spelling or a decimal number.
920 Prefixes such as % are optional. */
923 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
925 /* Presume just one register is clobbered. */
932 /* Get rid of confusing prefixes. */
933 asmspec
= strip_reg_name (asmspec
);
935 /* Allow a decimal number as a "register name". */
936 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
937 if (! ISDIGIT (asmspec
[i
]))
939 if (asmspec
[0] != 0 && i
< 0)
942 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0 && reg_names
[i
][0])
948 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
950 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
953 #ifdef OVERLAPPING_REGISTER_NAMES
957 const char *const name
;
960 } table
[] = OVERLAPPING_REGISTER_NAMES
;
962 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
964 && ! strcmp (asmspec
, table
[i
].name
))
966 *pnregs
= table
[i
].nregs
;
967 return table
[i
].number
;
970 #endif /* OVERLAPPING_REGISTER_NAMES */
972 #ifdef ADDITIONAL_REGISTER_NAMES
974 static const struct { const char *const name
; const int number
; } table
[]
975 = ADDITIONAL_REGISTER_NAMES
;
977 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
979 && ! strcmp (asmspec
, table
[i
].name
)
980 && reg_names
[table
[i
].number
][0])
981 return table
[i
].number
;
983 #endif /* ADDITIONAL_REGISTER_NAMES */
985 if (!strcmp (asmspec
, "memory"))
988 if (!strcmp (asmspec
, "cc"))
998 decode_reg_name (const char *name
)
1001 return decode_reg_name_and_count (name
, &count
);
1005 /* Return true if DECL's initializer is suitable for a BSS section. */
1008 bss_initializer_p (const_tree decl
, bool named
)
1010 /* Do not put non-common constants into the .bss section, they belong in
1011 a readonly section, except when NAMED is true. */
1012 return ((!TREE_READONLY (decl
) || DECL_COMMON (decl
) || named
)
1013 && (DECL_INITIAL (decl
) == NULL
1014 /* In LTO we have no errors in program; error_mark_node is used
1015 to mark offlined constructors. */
1016 || (DECL_INITIAL (decl
) == error_mark_node
1018 || (flag_zero_initialized_in_bss
1019 && initializer_zerop (DECL_INITIAL (decl
)))));
1022 /* Compute the alignment of variable specified by DECL.
1023 DONT_OUTPUT_DATA is from assemble_variable. */
1026 align_variable (tree decl
, bool dont_output_data
)
1028 unsigned int align
= DECL_ALIGN (decl
);
1030 /* In the case for initialing an array whose length isn't specified,
1031 where we have not yet been able to do the layout,
1032 figure out the proper alignment now. */
1033 if (dont_output_data
&& DECL_SIZE (decl
) == 0
1034 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
1035 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
1037 /* Some object file formats have a maximum alignment which they support.
1038 In particular, a.out format supports a maximum alignment of 4. */
1039 if (align
> MAX_OFILE_ALIGNMENT
)
1041 error ("alignment of %q+D is greater than maximum object "
1042 "file alignment %d", decl
,
1043 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
1044 align
= MAX_OFILE_ALIGNMENT
;
1047 if (! DECL_USER_ALIGN (decl
))
1049 #ifdef DATA_ABI_ALIGNMENT
1050 unsigned int data_abi_align
1051 = DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1052 /* For backwards compatibility, don't assume the ABI alignment for
1054 if (! DECL_THREAD_LOCAL_P (decl
) || data_abi_align
<= BITS_PER_WORD
)
1055 align
= data_abi_align
;
1058 /* On some machines, it is good to increase alignment sometimes.
1059 But as DECL_ALIGN is used both for actually emitting the variable
1060 and for code accessing the variable as guaranteed alignment, we
1061 can only increase the alignment if it is a performance optimization
1062 if the references to it must bind to the current definition. */
1063 if (decl_binds_to_current_def_p (decl
)
1064 && !DECL_VIRTUAL_P (decl
))
1066 #ifdef DATA_ALIGNMENT
1067 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1068 /* Don't increase alignment too much for TLS variables - TLS space
1070 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1073 if (DECL_INITIAL (decl
) != 0
1074 /* In LTO we have no errors in program; error_mark_node is used
1075 to mark offlined constructors. */
1076 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1078 unsigned int const_align
1079 = targetm
.constant_alignment (DECL_INITIAL (decl
), align
);
1080 /* Don't increase alignment too much for TLS variables - TLS
1081 space is too precious. */
1082 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1083 align
= const_align
;
1088 /* Reset the alignment in case we have made it tighter, so we can benefit
1089 from it in get_pointer_alignment. */
1090 SET_DECL_ALIGN (decl
, align
);
1093 /* Return DECL_ALIGN (decl), possibly increased for optimization purposes
1094 beyond what align_variable returned. */
1097 get_variable_align (tree decl
)
1099 unsigned int align
= DECL_ALIGN (decl
);
1101 /* For user aligned vars or static vars align_variable already did
1103 if (DECL_USER_ALIGN (decl
) || !TREE_PUBLIC (decl
))
1106 #ifdef DATA_ABI_ALIGNMENT
1107 if (DECL_THREAD_LOCAL_P (decl
))
1108 align
= DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1111 /* For decls that bind to the current definition, align_variable
1112 did also everything, except for not assuming ABI required alignment
1113 of TLS variables. For other vars, increase the alignment here
1114 as an optimization. */
1115 if (!decl_binds_to_current_def_p (decl
))
1117 /* On some machines, it is good to increase alignment sometimes. */
1118 #ifdef DATA_ALIGNMENT
1119 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1120 /* Don't increase alignment too much for TLS variables - TLS space
1122 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1125 if (DECL_INITIAL (decl
) != 0
1126 /* In LTO we have no errors in program; error_mark_node is used
1127 to mark offlined constructors. */
1128 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1130 unsigned int const_align
1131 = targetm
.constant_alignment (DECL_INITIAL (decl
), align
);
1132 /* Don't increase alignment too much for TLS variables - TLS space
1134 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1135 align
= const_align
;
1142 /* Return the section into which the given VAR_DECL or CONST_DECL
1143 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1144 section should be used wherever possible. */
1147 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1149 addr_space_t as
= ADDR_SPACE_GENERIC
;
1151 varpool_node
*vnode
= varpool_node::get (decl
);
1154 vnode
= vnode
->ultimate_alias_target ();
1158 if (TREE_TYPE (decl
) != error_mark_node
)
1159 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1161 /* We need the constructor to figure out reloc flag. */
1163 vnode
->get_constructor ();
1165 if (DECL_COMMON (decl
))
1167 /* If the decl has been given an explicit section name, or it resides
1168 in a non-generic address space, then it isn't common, and shouldn't
1169 be handled as such. */
1170 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1171 && ADDR_SPACE_GENERIC_P (as
));
1172 if (DECL_THREAD_LOCAL_P (decl
))
1173 return tls_comm_section
;
1174 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1175 return comm_section
;
1178 if (DECL_INITIAL (decl
) == error_mark_node
)
1179 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1180 else if (DECL_INITIAL (decl
))
1181 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1185 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1186 if (IN_NAMED_SECTION (decl
))
1188 section
*sect
= get_named_section (decl
, NULL
, reloc
);
1190 if ((sect
->common
.flags
& SECTION_BSS
)
1191 && !bss_initializer_p (decl
, true))
1193 error_at (DECL_SOURCE_LOCATION (decl
),
1194 "only zero initializers are allowed in section %qs",
1196 DECL_INITIAL (decl
) = error_mark_node
;
1201 if (ADDR_SPACE_GENERIC_P (as
)
1202 && !DECL_THREAD_LOCAL_P (decl
)
1203 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1204 && bss_initializer_p (decl
))
1206 if (!TREE_PUBLIC (decl
)
1207 && !((flag_sanitize
& SANITIZE_ADDRESS
)
1208 && asan_protect_global (decl
)))
1209 return lcomm_section
;
1210 if (bss_noswitch_section
)
1211 return bss_noswitch_section
;
1214 return targetm
.asm_out
.select_section (decl
, reloc
,
1215 get_variable_align (decl
));
1218 /* Return the block into which object_block DECL should be placed. */
1220 static struct object_block
*
1221 get_block_for_decl (tree decl
)
1227 /* The object must be defined in this translation unit. */
1228 if (DECL_EXTERNAL (decl
))
1231 /* There's no point using object blocks for something that is
1232 isolated by definition. */
1233 if (DECL_COMDAT_GROUP (decl
))
1237 /* We can only calculate block offsets if the decl has a known
1239 if (DECL_SIZE_UNIT (decl
) == NULL
)
1241 if (!tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
)))
1244 /* Find out which section should contain DECL. We cannot put it into
1245 an object block if it requires a standalone definition. */
1247 align_variable (decl
, 0);
1248 sect
= get_variable_section (decl
, true);
1249 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1252 return get_block_for_section (sect
);
1255 /* Make sure block symbol SYMBOL is in block BLOCK. */
1258 change_symbol_block (rtx symbol
, struct object_block
*block
)
1260 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1262 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1263 SYMBOL_REF_BLOCK (symbol
) = block
;
1267 /* Return true if it is possible to put DECL in an object_block. */
1270 use_blocks_for_decl_p (tree decl
)
1272 struct symtab_node
*snode
;
1274 /* Only data DECLs can be placed into object blocks. */
1275 if (!VAR_P (decl
) && TREE_CODE (decl
) != CONST_DECL
)
1278 /* DECL_INITIAL (decl) set to decl is a hack used for some decls that
1279 are never used from code directly and we never want object block handling
1281 if (DECL_INITIAL (decl
) == decl
)
1284 /* If this decl is an alias, then we don't want to emit a
1287 && (snode
= symtab_node::get (decl
)) != NULL
1291 return targetm
.use_blocks_for_decl_p (decl
);
1294 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
1295 until we find an identifier that is not itself a transparent alias.
1296 Modify the alias passed to it by reference (and all aliases on the
1297 way to the ultimate target), such that they do not have to be
1298 followed again, and return the ultimate target of the alias
1302 ultimate_transparent_alias_target (tree
*alias
)
1304 tree target
= *alias
;
1306 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
1308 gcc_assert (TREE_CHAIN (target
));
1309 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
1310 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
1311 && ! TREE_CHAIN (target
));
1318 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1319 have static storage duration. In other words, it should not be an
1320 automatic variable, including PARM_DECLs.
1322 There is, however, one exception: this function handles variables
1323 explicitly placed in a particular register by the user.
1325 This is never called for PARM_DECL nodes. */
1328 make_decl_rtl (tree decl
)
1330 const char *name
= 0;
1335 /* Check that we are not being given an automatic variable. */
1336 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1337 && TREE_CODE (decl
) != RESULT_DECL
);
1339 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1340 gcc_assert (!VAR_P (decl
)
1341 || TREE_STATIC (decl
)
1342 || TREE_PUBLIC (decl
)
1343 || DECL_EXTERNAL (decl
)
1344 || DECL_REGISTER (decl
));
1346 /* And that we were not given a type or a label. */
1347 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1348 && TREE_CODE (decl
) != LABEL_DECL
);
1350 /* For a duplicate declaration, we can be called twice on the
1351 same DECL node. Don't discard the RTL already made. */
1352 if (DECL_RTL_SET_P (decl
))
1354 /* If the old RTL had the wrong mode, fix the mode. */
1355 x
= DECL_RTL (decl
);
1356 if (GET_MODE (x
) != DECL_MODE (decl
))
1357 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1359 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1362 /* ??? Another way to do this would be to maintain a hashed
1363 table of such critters. Instead of adding stuff to a DECL
1364 to give certain attributes to it, we could use an external
1365 hash map from DECL to set of attributes. */
1367 /* Let the target reassign the RTL if it wants.
1368 This is necessary, for example, when one machine specific
1369 decl attribute overrides another. */
1370 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1372 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1373 on the new decl information. */
1375 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1376 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1377 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1382 /* If this variable belongs to the global constant pool, retrieve the
1383 pre-computed RTL or recompute it in LTO mode. */
1384 if (VAR_P (decl
) && DECL_IN_CONSTANT_POOL (decl
))
1386 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1390 id
= DECL_ASSEMBLER_NAME (decl
);
1391 name
= IDENTIFIER_POINTER (id
);
1393 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1394 && DECL_REGISTER (decl
))
1396 error ("register name not specified for %q+D", decl
);
1398 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1400 const char *asmspec
= name
+1;
1401 machine_mode mode
= DECL_MODE (decl
);
1402 reg_number
= decode_reg_name (asmspec
);
1403 /* First detect errors in declaring global registers. */
1404 if (reg_number
== -1)
1405 error ("register name not specified for %q+D", decl
);
1406 else if (reg_number
< 0)
1407 error ("invalid register name for %q+D", decl
);
1408 else if (mode
== BLKmode
)
1409 error ("data type of %q+D isn%'t suitable for a register",
1411 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1412 error ("the register specified for %q+D cannot be accessed"
1413 " by the current target", decl
);
1414 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1415 error ("the register specified for %q+D is not general enough"
1416 " to be used as a register variable", decl
);
1417 else if (!targetm
.hard_regno_mode_ok (reg_number
, mode
))
1418 error ("register specified for %q+D isn%'t suitable for data type",
1420 /* Now handle properly declared static register variables. */
1425 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1427 DECL_INITIAL (decl
) = 0;
1428 error ("global register variable has initial value");
1430 if (TREE_THIS_VOLATILE (decl
))
1431 warning (OPT_Wvolatile_register_var
,
1432 "optimization may eliminate reads and/or "
1433 "writes to register variables");
1435 /* If the user specified one of the eliminables registers here,
1436 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1437 confused with that register and be eliminated. This usage is
1438 somewhat suspect... */
1440 SET_DECL_RTL (decl
, gen_raw_REG (mode
, reg_number
));
1441 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1442 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1444 if (TREE_STATIC (decl
))
1446 /* Make this register global, so not usable for anything
1448 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1449 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1450 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1452 nregs
= hard_regno_nregs (reg_number
, mode
);
1454 globalize_reg (decl
, reg_number
+ --nregs
);
1457 /* As a register variable, it has no section. */
1460 /* Avoid internal errors from invalid register
1462 SET_DECL_ASSEMBLER_NAME (decl
, NULL_TREE
);
1463 DECL_HARD_REGISTER (decl
) = 0;
1464 /* Also avoid SSA inconsistencies by pretending this is an external
1466 DECL_EXTERNAL (decl
) = 1;
1469 /* Now handle ordinary static variables and functions (in memory).
1470 Also handle vars declared register invalidly. */
1471 else if (name
[0] == '*')
1473 #ifdef REGISTER_PREFIX
1474 if (strlen (REGISTER_PREFIX
) != 0)
1476 reg_number
= decode_reg_name (name
);
1477 if (reg_number
>= 0 || reg_number
== -3)
1478 error ("register name given for non-register variable %q+D", decl
);
1483 /* Specifying a section attribute on a variable forces it into a
1484 non-.bss section, and thus it cannot be common. */
1485 /* FIXME: In general this code should not be necessary because
1486 visibility pass is doing the same work. But notice_global_symbol
1487 is called early and it needs to make DECL_RTL to get the name.
1488 we take care of recomputing the DECL_RTL after visibility is changed. */
1490 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
))
1491 && DECL_SECTION_NAME (decl
) != NULL
1492 && DECL_INITIAL (decl
) == NULL_TREE
1493 && DECL_COMMON (decl
))
1494 DECL_COMMON (decl
) = 0;
1496 /* Variables can't be both common and weak. */
1497 if (VAR_P (decl
) && DECL_WEAK (decl
))
1498 DECL_COMMON (decl
) = 0;
1500 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1501 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1504 machine_mode address_mode
= Pmode
;
1505 if (TREE_TYPE (decl
) != error_mark_node
)
1507 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1508 address_mode
= targetm
.addr_space
.address_mode (as
);
1510 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1512 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1513 SET_SYMBOL_REF_DECL (x
, decl
);
1515 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1516 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1517 set_mem_attributes (x
, decl
, 1);
1518 SET_DECL_RTL (decl
, x
);
1520 /* Optionally set flags or add text to the name to record information
1521 such as that it is a function name.
1522 If the name is changed, the macro ASM_OUTPUT_LABELREF
1523 will have to know how to strip this information. */
1524 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1527 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1528 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1532 make_decl_rtl_for_debug (tree decl
)
1534 unsigned int save_aliasing_flag
;
1537 if (DECL_RTL_SET_P (decl
))
1538 return DECL_RTL (decl
);
1540 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1541 call new_alias_set. If running with -fcompare-debug, sometimes
1542 we do not want to create alias sets that will throw the alias
1543 numbers off in the comparison dumps. So... clearing
1544 flag_strict_aliasing will keep new_alias_set() from creating a
1546 save_aliasing_flag
= flag_strict_aliasing
;
1547 flag_strict_aliasing
= 0;
1549 rtl
= DECL_RTL (decl
);
1550 /* Reset DECL_RTL back, as various parts of the compiler expects
1551 DECL_RTL set meaning it is actually going to be output. */
1552 SET_DECL_RTL (decl
, NULL
);
1554 flag_strict_aliasing
= save_aliasing_flag
;
1558 /* Output a string of literal assembler code
1559 for an `asm' keyword used between functions. */
1562 assemble_asm (tree string
)
1567 if (TREE_CODE (string
) == ADDR_EXPR
)
1568 string
= TREE_OPERAND (string
, 0);
1570 p
= TREE_STRING_POINTER (string
);
1571 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1574 /* Write the address of the entity given by SYMBOL to SEC. */
1576 assemble_addr_to_section (rtx symbol
, section
*sec
)
1578 switch_to_section (sec
);
1579 assemble_align (POINTER_SIZE
);
1580 assemble_integer (symbol
, POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
1583 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1584 not) section for PRIORITY. */
1586 get_cdtor_priority_section (int priority
, bool constructor_p
)
1588 /* Buffer conservatively large enough for the full range of a 32-bit
1589 int plus the text below. */
1592 /* ??? This only works reliably with the GNU linker. */
1593 sprintf (buf
, "%s.%.5u",
1594 constructor_p
? ".ctors" : ".dtors",
1595 /* Invert the numbering so the linker puts us in the proper
1596 order; constructors are run from right to left, and the
1597 linker sorts in increasing order. */
1598 MAX_INIT_PRIORITY
- priority
);
1599 return get_section (buf
, SECTION_WRITE
, NULL
);
1603 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1607 if (priority
!= DEFAULT_INIT_PRIORITY
)
1608 sec
= get_cdtor_priority_section (priority
,
1609 /*constructor_p=*/false);
1611 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1613 assemble_addr_to_section (symbol
, sec
);
1616 #ifdef DTORS_SECTION_ASM_OP
1618 default_dtor_section_asm_out_destructor (rtx symbol
,
1619 int priority ATTRIBUTE_UNUSED
)
1621 assemble_addr_to_section (symbol
, dtors_section
);
1626 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1630 if (priority
!= DEFAULT_INIT_PRIORITY
)
1631 sec
= get_cdtor_priority_section (priority
,
1632 /*constructor_p=*/true);
1634 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1636 assemble_addr_to_section (symbol
, sec
);
1639 #ifdef CTORS_SECTION_ASM_OP
1641 default_ctor_section_asm_out_constructor (rtx symbol
,
1642 int priority ATTRIBUTE_UNUSED
)
1644 assemble_addr_to_section (symbol
, ctors_section
);
1648 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1649 a nonzero value if the constant pool should be output before the
1650 start of the function, or a zero value if the pool should output
1651 after the end of the function. The default is to put it before the
1654 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1655 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1658 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1659 to be output to assembler.
1660 Set first_global_object_name and weak_global_object_name as appropriate. */
1663 notice_global_symbol (tree decl
)
1665 const char **t
= &first_global_object_name
;
1667 if (first_global_object_name
1668 || !TREE_PUBLIC (decl
)
1669 || DECL_EXTERNAL (decl
)
1670 || !DECL_NAME (decl
)
1671 || (VAR_P (decl
) && DECL_HARD_REGISTER (decl
))
1672 || (TREE_CODE (decl
) != FUNCTION_DECL
1674 || (DECL_COMMON (decl
)
1675 && (DECL_INITIAL (decl
) == 0
1676 || DECL_INITIAL (decl
) == error_mark_node
)))))
1679 /* We win when global object is found, but it is useful to know about weak
1680 symbol as well so we can produce nicer unique names. */
1681 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1682 t
= &weak_global_object_name
;
1686 tree id
= DECL_ASSEMBLER_NAME (decl
);
1687 ultimate_transparent_alias_target (&id
);
1688 *t
= ggc_strdup (targetm
.strip_name_encoding (IDENTIFIER_POINTER (id
)));
1692 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1693 current function goes into the cold section, so that targets can use
1694 current_function_section during RTL expansion. DECL describes the
1698 decide_function_section (tree decl
)
1700 first_function_block_is_cold
= false;
1702 if (DECL_SECTION_NAME (decl
))
1704 struct cgraph_node
*node
= cgraph_node::get (current_function_decl
);
1705 /* Calls to function_section rely on first_function_block_is_cold
1707 first_function_block_is_cold
= (node
1709 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1712 in_cold_section_p
= first_function_block_is_cold
;
1715 /* Get the function's name, as described by its RTL. This may be
1716 different from the DECL_NAME name used in the source file. */
1718 get_fnname_from_decl (tree decl
)
1720 rtx x
= DECL_RTL (decl
);
1721 gcc_assert (MEM_P (x
));
1723 gcc_assert (GET_CODE (x
) == SYMBOL_REF
);
1727 /* Output assembler code for the constant pool of a function and associated
1728 with defining the name of the function. DECL describes the function.
1729 NAME is the function's name. For the constant pool, we use the current
1730 constant pool data. */
1733 assemble_start_function (tree decl
, const char *fnname
)
1736 char tmp_label
[100];
1737 bool hot_label_written
= false;
1739 if (crtl
->has_bb_partition
)
1741 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1742 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1743 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1744 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1745 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1746 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1747 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1748 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1750 cold_function_name
= NULL_TREE
;
1754 crtl
->subsections
.hot_section_label
= NULL
;
1755 crtl
->subsections
.cold_section_label
= NULL
;
1756 crtl
->subsections
.hot_section_end_label
= NULL
;
1757 crtl
->subsections
.cold_section_end_label
= NULL
;
1760 /* The following code does not need preprocessing in the assembler. */
1764 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1765 output_constant_pool (fnname
, decl
);
1767 align
= symtab_node::get (decl
)->definition_alignment ();
1769 /* Make sure the not and cold text (code) sections are properly
1770 aligned. This is necessary here in the case where the function
1771 has both hot and cold sections, because we don't want to re-set
1772 the alignment when the section switch happens mid-function. */
1774 if (crtl
->has_bb_partition
)
1776 first_function_block_is_cold
= false;
1778 switch_to_section (unlikely_text_section ());
1779 assemble_align (align
);
1780 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1782 /* When the function starts with a cold section, we need to explicitly
1783 align the hot section and write out the hot section label.
1784 But if the current function is a thunk, we do not have a CFG. */
1786 && BB_PARTITION (ENTRY_BLOCK_PTR_FOR_FN (cfun
)->next_bb
) == BB_COLD_PARTITION
)
1788 switch_to_section (text_section
);
1789 assemble_align (align
);
1790 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1791 hot_label_written
= true;
1792 first_function_block_is_cold
= true;
1794 in_cold_section_p
= first_function_block_is_cold
;
1798 /* Switch to the correct text section for the start of the function. */
1800 switch_to_section (function_section (decl
));
1801 if (crtl
->has_bb_partition
&& !hot_label_written
)
1802 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1804 /* Tell assembler to move to target machine's alignment for functions. */
1805 align
= floor_log2 (align
/ BITS_PER_UNIT
);
1808 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1811 /* Handle a user-specified function alignment.
1812 Note that we still need to align to DECL_ALIGN, as above,
1813 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1814 if (! DECL_USER_ALIGN (decl
)
1815 && align_functions
.levels
[0].log
> align
1816 && optimize_function_for_speed_p (cfun
))
1818 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1819 int align_log
= align_functions
.levels
[0].log
;
1821 int max_skip
= align_functions
.levels
[0].maxskip
;
1822 if (flag_limit_function_alignment
&& crtl
->max_insn_address
> 0
1823 && max_skip
>= crtl
->max_insn_address
)
1824 max_skip
= crtl
->max_insn_address
- 1;
1826 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1827 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
, align_log
, max_skip
);
1828 if (max_skip
== align_functions
.levels
[0].maxskip
)
1829 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1830 align_functions
.levels
[1].log
,
1831 align_functions
.levels
[1].maxskip
);
1833 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions
.levels
[0].log
);
1837 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1838 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1841 if (!DECL_IGNORED_P (decl
))
1842 (*debug_hooks
->begin_function
) (decl
);
1844 /* Make function name accessible from other files, if appropriate. */
1846 if (TREE_PUBLIC (decl
))
1848 notice_global_symbol (decl
);
1850 globalize_decl (decl
);
1852 maybe_assemble_visibility (decl
);
1855 if (DECL_PRESERVE_P (decl
))
1856 targetm
.asm_out
.mark_decl_preserved (fnname
);
1858 unsigned HOST_WIDE_INT patch_area_size
= function_entry_patch_area_size
;
1859 unsigned HOST_WIDE_INT patch_area_entry
= function_entry_patch_area_start
;
1861 tree patchable_function_entry_attr
1862 = lookup_attribute ("patchable_function_entry", DECL_ATTRIBUTES (decl
));
1863 if (patchable_function_entry_attr
)
1865 tree pp_val
= TREE_VALUE (patchable_function_entry_attr
);
1866 tree patchable_function_entry_value1
= TREE_VALUE (pp_val
);
1868 patch_area_size
= tree_to_uhwi (patchable_function_entry_value1
);
1869 patch_area_entry
= 0;
1870 if (TREE_CHAIN (pp_val
) != NULL_TREE
)
1872 tree patchable_function_entry_value2
1873 = TREE_VALUE (TREE_CHAIN (pp_val
));
1874 patch_area_entry
= tree_to_uhwi (patchable_function_entry_value2
);
1878 if (patch_area_entry
> patch_area_size
)
1880 if (patch_area_size
> 0)
1881 warning (OPT_Wattributes
,
1882 "patchable function entry %wu exceeds size %wu",
1883 patch_area_entry
, patch_area_size
);
1884 patch_area_entry
= 0;
1887 /* Emit the patching area before the entry label, if any. */
1888 if (patch_area_entry
> 0)
1889 targetm
.asm_out
.print_patchable_function_entry (asm_out_file
,
1890 patch_area_entry
, true);
1892 /* Do any machine/system dependent processing of the function name. */
1893 #ifdef ASM_DECLARE_FUNCTION_NAME
1894 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1896 /* Standard thing is just output label for the function. */
1897 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1898 #endif /* ASM_DECLARE_FUNCTION_NAME */
1900 /* And the area after the label. Record it if we haven't done so yet. */
1901 if (patch_area_size
> patch_area_entry
)
1902 targetm
.asm_out
.print_patchable_function_entry (asm_out_file
,
1905 patch_area_entry
== 0);
1907 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1908 saw_no_split_stack
= true;
1911 /* Output assembler code associated with defining the size of the
1912 function. DECL describes the function. NAME is the function's name. */
1915 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1917 #ifdef ASM_DECLARE_FUNCTION_SIZE
1918 /* We could have switched section in the middle of the function. */
1919 if (crtl
->has_bb_partition
)
1920 switch_to_section (function_section (decl
));
1921 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1923 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1925 output_constant_pool (fnname
, decl
);
1926 switch_to_section (function_section (decl
)); /* need to switch back */
1928 /* Output labels for end of hot/cold text sections (to be used by
1930 if (crtl
->has_bb_partition
)
1932 section
*save_text_section
;
1934 save_text_section
= in_section
;
1935 switch_to_section (unlikely_text_section ());
1936 #ifdef ASM_DECLARE_COLD_FUNCTION_SIZE
1937 if (cold_function_name
!= NULL_TREE
)
1938 ASM_DECLARE_COLD_FUNCTION_SIZE (asm_out_file
,
1939 IDENTIFIER_POINTER (cold_function_name
),
1942 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1943 if (first_function_block_is_cold
)
1944 switch_to_section (text_section
);
1946 switch_to_section (function_section (decl
));
1947 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1948 switch_to_section (save_text_section
);
1952 /* Assemble code to leave SIZE bytes of zeros. */
1955 assemble_zeros (unsigned HOST_WIDE_INT size
)
1957 /* Do no output if -fsyntax-only. */
1958 if (flag_syntax_only
)
1961 #ifdef ASM_NO_SKIP_IN_TEXT
1962 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1963 so we must output 0s explicitly in the text section. */
1964 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1966 unsigned HOST_WIDE_INT i
;
1967 for (i
= 0; i
< size
; i
++)
1968 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1973 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1976 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1979 assemble_align (unsigned int align
)
1981 if (align
> BITS_PER_UNIT
)
1983 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1987 /* Assemble a string constant with the specified C string as contents. */
1990 assemble_string (const char *p
, int size
)
1995 /* If the string is very long, split it up. */
1999 int thissize
= size
- pos
;
2000 if (thissize
> maximum
)
2003 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
2011 /* A noswitch_section_callback for lcomm_section. */
2014 emit_local (tree decl ATTRIBUTE_UNUSED
,
2015 const char *name ATTRIBUTE_UNUSED
,
2016 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
2017 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2019 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
2020 unsigned int align
= symtab_node::get (decl
)->definition_alignment ();
2021 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
2024 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
2025 unsigned int align
= symtab_node::get (decl
)->definition_alignment ();
2026 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, align
);
2029 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2034 /* A noswitch_section_callback for bss_noswitch_section. */
2036 #if defined ASM_OUTPUT_ALIGNED_BSS
2038 emit_bss (tree decl ATTRIBUTE_UNUSED
,
2039 const char *name ATTRIBUTE_UNUSED
,
2040 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
2041 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2043 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
,
2044 get_variable_align (decl
));
2049 /* A noswitch_section_callback for comm_section. */
2052 emit_common (tree decl ATTRIBUTE_UNUSED
,
2053 const char *name ATTRIBUTE_UNUSED
,
2054 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
2055 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2057 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
2058 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
2059 size
, get_variable_align (decl
));
2061 #elif defined ASM_OUTPUT_ALIGNED_COMMON
2062 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
,
2063 get_variable_align (decl
));
2066 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
2071 /* A noswitch_section_callback for tls_comm_section. */
2074 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
2075 const char *name ATTRIBUTE_UNUSED
,
2076 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
2077 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2079 #ifdef ASM_OUTPUT_TLS_COMMON
2080 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
2083 sorry ("thread-local COMMON data not implemented");
2088 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
2089 NAME is the name of DECL's SYMBOL_REF. */
2092 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
,
2095 unsigned HOST_WIDE_INT size
, rounded
;
2097 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2100 if ((flag_sanitize
& SANITIZE_ADDRESS
) && asan_protect_global (decl
))
2101 size
+= asan_red_zone_size (size
);
2103 /* Don't allocate zero bytes of common,
2104 since that means "undefined external" in the linker. */
2108 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2109 so that each uninitialized object starts on such a boundary. */
2110 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
2111 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2112 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2114 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
2115 && (unsigned HOST_WIDE_INT
) (align
/ BITS_PER_UNIT
) > rounded
)
2116 error ("requested alignment for %q+D is greater than "
2117 "implemented alignment of %wu", decl
, rounded
);
2120 /* A subroutine of assemble_variable. Output the label and contents of
2121 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
2122 is as for assemble_variable. */
2125 assemble_variable_contents (tree decl
, const char *name
,
2126 bool dont_output_data
, bool merge_strings
)
2128 /* Do any machine/system dependent processing of the object. */
2129 #ifdef ASM_DECLARE_OBJECT_NAME
2130 last_assemble_variable_decl
= decl
;
2131 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
2133 /* Standard thing is just output label for the object. */
2134 ASM_OUTPUT_LABEL (asm_out_file
, name
);
2135 #endif /* ASM_DECLARE_OBJECT_NAME */
2137 if (!dont_output_data
)
2139 /* Caller is supposed to use varpool_get_constructor when it wants
2140 to output the body. */
2141 gcc_assert (!in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
);
2142 if (DECL_INITIAL (decl
)
2143 && DECL_INITIAL (decl
) != error_mark_node
2144 && !initializer_zerop (DECL_INITIAL (decl
)))
2145 /* Output the actual data. */
2146 output_constant (DECL_INITIAL (decl
),
2147 tree_to_uhwi (DECL_SIZE_UNIT (decl
)),
2148 get_variable_align (decl
),
2149 false, merge_strings
);
2151 /* Leave space for it. */
2152 assemble_zeros (tree_to_uhwi (DECL_SIZE_UNIT (decl
)));
2153 targetm
.asm_out
.decl_end ();
2157 /* Write out assembly for the variable DECL, which is not defined in
2158 the current translation unit. */
2160 assemble_undefined_decl (tree decl
)
2162 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
2163 targetm
.asm_out
.assemble_undefined_decl (asm_out_file
, name
, decl
);
2166 /* Assemble everything that is needed for a variable or function declaration.
2167 Not used for automatic variables, and not used for function definitions.
2168 Should not be called for variables of incomplete structure type.
2170 TOP_LEVEL is nonzero if this variable has file scope.
2171 AT_END is nonzero if this is the special handling, at end of compilation,
2172 to define things that have had only tentative definitions.
2173 DONT_OUTPUT_DATA if nonzero means don't actually output the
2174 initial value (that will be done by the caller). */
2177 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
2178 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
2181 rtx decl_rtl
, symbol
;
2184 bool asan_protected
= false;
2186 /* This function is supposed to handle VARIABLES. Ensure we have one. */
2187 gcc_assert (VAR_P (decl
));
2189 /* Emulated TLS had better not get this far. */
2190 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
2192 last_assemble_variable_decl
= 0;
2194 /* Normally no need to say anything here for external references,
2195 since assemble_external is called by the language-specific code
2196 when a declaration is first seen. */
2198 if (DECL_EXTERNAL (decl
))
2201 /* Do nothing for global register variables. */
2202 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
2204 TREE_ASM_WRITTEN (decl
) = 1;
2208 /* If type was incomplete when the variable was declared,
2209 see if it is complete now. */
2211 if (DECL_SIZE (decl
) == 0)
2212 layout_decl (decl
, 0);
2214 /* Still incomplete => don't allocate it; treat the tentative defn
2215 (which is what it must have been) as an `extern' reference. */
2217 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2219 error ("storage size of %q+D isn%'t known", decl
);
2220 TREE_ASM_WRITTEN (decl
) = 1;
2224 /* The first declaration of a variable that comes through this function
2225 decides whether it is global (in C, has external linkage)
2226 or local (in C, has internal linkage). So do nothing more
2227 if this function has already run. */
2229 if (TREE_ASM_WRITTEN (decl
))
2232 /* Make sure targetm.encode_section_info is invoked before we set
2234 decl_rtl
= DECL_RTL (decl
);
2236 TREE_ASM_WRITTEN (decl
) = 1;
2238 /* Do no output if -fsyntax-only. */
2239 if (flag_syntax_only
)
2242 if (! dont_output_data
2243 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
2245 error ("size of variable %q+D is too large", decl
);
2249 gcc_assert (MEM_P (decl_rtl
));
2250 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2251 symbol
= XEXP (decl_rtl
, 0);
2253 /* If this symbol belongs to the tree constant pool, output the constant
2254 if it hasn't already been written. */
2255 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
2257 tree decl
= SYMBOL_REF_DECL (symbol
);
2258 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
2259 output_constant_def_contents (symbol
);
2265 name
= XSTR (symbol
, 0);
2266 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2267 notice_global_symbol (decl
);
2269 /* Compute the alignment of this data. */
2271 align_variable (decl
, dont_output_data
);
2273 if ((flag_sanitize
& SANITIZE_ADDRESS
)
2274 && asan_protect_global (decl
))
2276 asan_protected
= true;
2277 SET_DECL_ALIGN (decl
, MAX (DECL_ALIGN (decl
),
2278 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
));
2281 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2283 align
= get_variable_align (decl
);
2285 if (TREE_PUBLIC (decl
))
2286 maybe_assemble_visibility (decl
);
2288 if (DECL_PRESERVE_P (decl
))
2289 targetm
.asm_out
.mark_decl_preserved (name
);
2291 /* First make the assembler name(s) global if appropriate. */
2292 sect
= get_variable_section (decl
, false);
2293 if (TREE_PUBLIC (decl
)
2294 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2295 globalize_decl (decl
);
2297 /* Output any data that we will need to use the address of. */
2298 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2299 output_addressed_constants (DECL_INITIAL (decl
));
2301 /* dbxout.c needs to know this. */
2302 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2303 DECL_IN_TEXT_SECTION (decl
) = 1;
2305 /* If the decl is part of an object_block, make sure that the decl
2306 has been positioned within its block, but do not write out its
2307 definition yet. output_object_blocks will do that later. */
2308 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2310 gcc_assert (!dont_output_data
);
2311 place_block_symbol (symbol
);
2313 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2314 assemble_noswitch_variable (decl
, name
, sect
, align
);
2317 /* Special-case handling of vtv comdat sections. */
2318 if (sect
->named
.name
2319 && (strcmp (sect
->named
.name
, ".vtable_map_vars") == 0))
2320 handle_vtv_comdat_section (sect
, decl
);
2322 switch_to_section (sect
);
2323 if (align
> BITS_PER_UNIT
)
2324 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
2325 assemble_variable_contents (decl
, name
, dont_output_data
,
2326 (sect
->common
.flags
& SECTION_MERGE
)
2327 && (sect
->common
.flags
& SECTION_STRINGS
));
2330 unsigned HOST_WIDE_INT
int size
2331 = tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2332 assemble_zeros (asan_red_zone_size (size
));
2338 /* Given a function declaration (FN_DECL), this function assembles the
2339 function into the .preinit_array section. */
2342 assemble_vtv_preinit_initializer (tree fn_decl
)
2345 unsigned flags
= SECTION_WRITE
;
2346 rtx symbol
= XEXP (DECL_RTL (fn_decl
), 0);
2348 flags
|= SECTION_NOTYPE
;
2349 sect
= get_section (".preinit_array", flags
, fn_decl
);
2350 switch_to_section (sect
);
2351 assemble_addr_to_section (symbol
, sect
);
2354 /* Return 1 if type TYPE contains any pointers. */
2357 contains_pointers_p (tree type
)
2359 switch (TREE_CODE (type
))
2362 case REFERENCE_TYPE
:
2363 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2364 so I'll play safe and return 1. */
2370 case QUAL_UNION_TYPE
:
2373 /* For a type that has fields, see if the fields have pointers. */
2374 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2375 if (TREE_CODE (fields
) == FIELD_DECL
2376 && contains_pointers_p (TREE_TYPE (fields
)))
2382 /* An array type contains pointers if its element type does. */
2383 return contains_pointers_p (TREE_TYPE (type
));
2390 /* We delay assemble_external processing until
2391 the compilation unit is finalized. This is the best we can do for
2392 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2393 it all the way to final. See PR 17982 for further discussion. */
2394 static GTY(()) tree pending_assemble_externals
;
2396 #ifdef ASM_OUTPUT_EXTERNAL
2397 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2398 As a result, assemble_external can be called after the list of externals
2399 is processed and the pointer set destroyed. */
2400 static bool pending_assemble_externals_processed
;
2402 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2403 TREE_LIST in assemble_external. */
2404 static hash_set
<tree
> *pending_assemble_externals_set
;
2406 /* True if DECL is a function decl for which no out-of-line copy exists.
2407 It is assumed that DECL's assembler name has been set. */
2410 incorporeal_function_p (tree decl
)
2412 if (TREE_CODE (decl
) == FUNCTION_DECL
&& fndecl_built_in_p (decl
))
2416 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2417 && ALLOCA_FUNCTION_CODE_P (DECL_FUNCTION_CODE (decl
)))
2420 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2421 /* Atomic or sync builtins which have survived this far will be
2422 resolved externally and therefore are not incorporeal. */
2423 if (strncmp (name
, "__builtin_", 10) == 0)
2429 /* Actually do the tests to determine if this is necessary, and invoke
2430 ASM_OUTPUT_EXTERNAL. */
2432 assemble_external_real (tree decl
)
2434 rtx rtl
= DECL_RTL (decl
);
2436 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2437 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2438 && !incorporeal_function_p (decl
))
2440 /* Some systems do require some output. */
2441 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2442 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2448 process_pending_assemble_externals (void)
2450 #ifdef ASM_OUTPUT_EXTERNAL
2452 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2453 assemble_external_real (TREE_VALUE (list
));
2455 pending_assemble_externals
= 0;
2456 pending_assemble_externals_processed
= true;
2457 delete pending_assemble_externals_set
;
2461 /* This TREE_LIST contains any weak symbol declarations waiting
2463 static GTY(()) tree weak_decls
;
2465 /* Output something to declare an external symbol to the assembler,
2466 and qualifiers such as weakness. (Most assemblers don't need
2467 extern declaration, so we normally output nothing.) Do nothing if
2468 DECL is not external. */
2471 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2473 /* Make sure that the ASM_OUT_FILE is open.
2474 If it's not, we should not be calling this function. */
2475 gcc_assert (asm_out_file
);
2477 /* In a perfect world, the following condition would be true.
2478 Sadly, the Go front end emit assembly *from the front end*,
2479 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2481 /* This function should only be called if we are expanding, or have
2483 Ideally, only final.c would be calling this function, but it is
2484 not clear whether that would break things somehow. See PR 17982
2485 for further discussion. */
2486 gcc_assert (state
== EXPANSION
2487 || state
== FINISHED
);
2490 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2493 /* We want to output annotation for weak and external symbols at
2494 very last to check if they are references or not. */
2496 if (TARGET_SUPPORTS_WEAK
2498 /* TREE_STATIC is a weird and abused creature which is not
2499 generally the right test for whether an entity has been
2500 locally emitted, inlined or otherwise not-really-extern, but
2501 for declarations that can be weak, it happens to be
2503 && !TREE_STATIC (decl
)
2504 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2505 && value_member (decl
, weak_decls
) == NULL_TREE
)
2506 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2508 #ifdef ASM_OUTPUT_EXTERNAL
2509 if (pending_assemble_externals_processed
)
2511 assemble_external_real (decl
);
2515 if (! pending_assemble_externals_set
->add (decl
))
2516 pending_assemble_externals
= tree_cons (NULL
, decl
,
2517 pending_assemble_externals
);
2521 /* Similar, for calling a library function FUN. */
2524 assemble_external_libcall (rtx fun
)
2526 /* Declare library function name external when first used, if nec. */
2527 if (! SYMBOL_REF_USED (fun
))
2529 SYMBOL_REF_USED (fun
) = 1;
2530 targetm
.asm_out
.external_libcall (fun
);
2534 /* Assemble a label named NAME. */
2537 assemble_label (FILE *file
, const char *name
)
2539 ASM_OUTPUT_LABEL (file
, name
);
2542 /* Set the symbol_referenced flag for ID. */
2544 mark_referenced (tree id
)
2546 TREE_SYMBOL_REFERENCED (id
) = 1;
2549 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2551 mark_decl_referenced (tree decl
)
2553 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2555 /* Extern inline functions don't become needed when referenced.
2556 If we know a method will be emitted in other TU and no new
2557 functions can be marked reachable, just use the external
2559 struct cgraph_node
*node
= cgraph_node::get_create (decl
);
2560 if (!DECL_EXTERNAL (decl
)
2561 && !node
->definition
)
2562 node
->mark_force_output ();
2564 else if (VAR_P (decl
))
2566 varpool_node
*node
= varpool_node::get_create (decl
);
2567 /* C++ frontend use mark_decl_references to force COMDAT variables
2568 to be output that might appear dead otherwise. */
2569 node
->force_output
= true;
2571 /* else do nothing - we can get various sorts of CST nodes here,
2572 which do not need to be marked. */
2576 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2577 starts with a *, the rest of NAME is output verbatim. Otherwise
2578 NAME is transformed in a target-specific way (usually by the
2579 addition of an underscore). */
2582 assemble_name_raw (FILE *file
, const char *name
)
2585 fputs (&name
[1], file
);
2587 ASM_OUTPUT_LABELREF (file
, name
);
2590 /* Like assemble_name_raw, but should be used when NAME might refer to
2591 an entity that is also represented as a tree (like a function or
2592 variable). If NAME does refer to such an entity, that entity will
2593 be marked as referenced. */
2596 assemble_name (FILE *file
, const char *name
)
2598 const char *real_name
;
2601 real_name
= targetm
.strip_name_encoding (name
);
2603 id
= maybe_get_identifier (real_name
);
2608 mark_referenced (id
);
2609 ultimate_transparent_alias_target (&id
);
2611 name
= IDENTIFIER_POINTER (id
);
2612 gcc_assert (! TREE_CHAIN (id
));
2615 assemble_name_raw (file
, name
);
2618 /* Allocate SIZE bytes writable static space with a gensym name
2619 and return an RTX to refer to its address. */
2622 assemble_static_space (unsigned HOST_WIDE_INT size
)
2625 const char *namestring
;
2628 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2630 namestring
= ggc_strdup (name
);
2632 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2633 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2635 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2636 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2639 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2640 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2643 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2644 so that each uninitialized object starts on such a boundary. */
2645 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2646 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2647 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2648 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2649 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2650 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2657 /* Assemble the static constant template for function entry trampolines.
2658 This is done at most once per compilation.
2659 Returns an RTX for the address of the template. */
2661 static GTY(()) rtx initial_trampoline
;
2664 assemble_trampoline_template (void)
2671 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2673 if (initial_trampoline
)
2674 return initial_trampoline
;
2676 /* By default, put trampoline templates in read-only data section. */
2678 #ifdef TRAMPOLINE_SECTION
2679 switch_to_section (TRAMPOLINE_SECTION
);
2681 switch_to_section (readonly_data_section
);
2684 /* Write the assembler code to define one. */
2685 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2687 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2689 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2690 targetm
.asm_out
.trampoline_template (asm_out_file
);
2692 /* Record the rtl to refer to it. */
2693 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2694 name
= ggc_strdup (label
);
2695 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2696 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2698 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2699 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2700 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2702 return initial_trampoline
;
2705 /* A and B are either alignments or offsets. Return the minimum alignment
2706 that may be assumed after adding the two together. */
2708 static inline unsigned
2709 min_align (unsigned int a
, unsigned int b
)
2711 return least_bit_hwi (a
| b
);
2714 /* Return the assembler directive for creating a given kind of integer
2715 object. SIZE is the number of bytes in the object and ALIGNED_P
2716 indicates whether it is known to be aligned. Return NULL if the
2717 assembly dialect has no such directive.
2719 The returned string should be printed at the start of a new line and
2720 be followed immediately by the object's initial value. */
2723 integer_asm_op (int size
, int aligned_p
)
2725 struct asm_int_op
*ops
;
2728 ops
= &targetm
.asm_out
.aligned_op
;
2730 ops
= &targetm
.asm_out
.unaligned_op
;
2735 return targetm
.asm_out
.byte_op
;
2763 /* Use directive OP to assemble an integer object X. Print OP at the
2764 start of the line, followed immediately by the value of X. */
2767 assemble_integer_with_op (const char *op
, rtx x
)
2769 fputs (op
, asm_out_file
);
2770 output_addr_const (asm_out_file
, x
);
2771 fputc ('\n', asm_out_file
);
2774 /* The default implementation of the asm_out.integer target hook. */
2777 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2778 unsigned int size ATTRIBUTE_UNUSED
,
2779 int aligned_p ATTRIBUTE_UNUSED
)
2781 const char *op
= integer_asm_op (size
, aligned_p
);
2782 /* Avoid GAS bugs for large values. Specifically negative values whose
2783 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2784 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE_UNITS
)
2786 return op
&& (assemble_integer_with_op (op
, x
), true);
2789 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2790 the alignment of the integer in bits. Return 1 if we were able to output
2791 the constant, otherwise 0. We must be able to output the constant,
2792 if FORCE is nonzero. */
2795 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2799 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2801 /* See if the target hook can handle this kind of object. */
2802 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2805 /* If the object is a multi-byte one, try splitting it up. Split
2806 it into words it if is multi-word, otherwise split it into bytes. */
2809 machine_mode omode
, imode
;
2810 unsigned int subalign
;
2811 unsigned int subsize
, i
;
2812 enum mode_class mclass
;
2814 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2815 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2816 if (GET_CODE (x
) == CONST_FIXED
)
2817 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2821 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0).require ();
2822 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0).require ();
2824 for (i
= 0; i
< size
; i
+= subsize
)
2826 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2827 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2833 /* If we've printed some of it, but not all of it, there's no going
2838 gcc_assert (!force
);
2843 /* Assemble the floating-point constant D into an object of size MODE. ALIGN
2844 is the alignment of the constant in bits. If REVERSE is true, D is output
2845 in reverse storage order. */
2848 assemble_real (REAL_VALUE_TYPE d
, scalar_float_mode mode
, unsigned int align
,
2851 long data
[4] = {0, 0, 0, 0};
2852 int bitsize
, nelts
, nunits
, units_per
;
2855 /* This is hairy. We have a quantity of known size. real_to_target
2856 will put it into an array of *host* longs, 32 bits per element
2857 (even if long is more than 32 bits). We need to determine the
2858 number of array elements that are occupied (nelts) and the number
2859 of *target* min-addressable units that will be occupied in the
2860 object file (nunits). We cannot assume that 32 divides the
2861 mode's bitsize (size * BITS_PER_UNIT) evenly.
2863 size * BITS_PER_UNIT is used here to make sure that padding bits
2864 (which might appear at either end of the value; real_to_target
2865 will include the padding bits in its output array) are included. */
2867 nunits
= GET_MODE_SIZE (mode
);
2868 bitsize
= nunits
* BITS_PER_UNIT
;
2869 nelts
= CEIL (bitsize
, 32);
2870 units_per
= 32 / BITS_PER_UNIT
;
2872 real_to_target (data
, &d
, mode
);
2874 /* Put out the first word with the specified alignment. */
2876 elt
= flip_storage_order (SImode
, gen_int_mode (data
[nelts
- 1], SImode
));
2878 elt
= GEN_INT (data
[0]);
2879 assemble_integer (elt
, MIN (nunits
, units_per
), align
, 1);
2880 nunits
-= units_per
;
2882 /* Subsequent words need only 32-bit alignment. */
2883 align
= min_align (align
, 32);
2885 for (int i
= 1; i
< nelts
; i
++)
2888 elt
= flip_storage_order (SImode
,
2889 gen_int_mode (data
[nelts
- 1 - i
], SImode
));
2891 elt
= GEN_INT (data
[i
]);
2892 assemble_integer (elt
, MIN (nunits
, units_per
), align
, 1);
2893 nunits
-= units_per
;
2897 /* Given an expression EXP with a constant value,
2898 reduce it to the sum of an assembler symbol and an integer.
2899 Store them both in the structure *VALUE.
2900 EXP must be reducible. */
2909 decode_addr_const (tree exp
, struct addr_const
*value
)
2911 tree target
= TREE_OPERAND (exp
, 0);
2912 poly_int64 offset
= 0;
2918 if (TREE_CODE (target
) == COMPONENT_REF
2919 && poly_int_tree_p (byte_position (TREE_OPERAND (target
, 1)),
2923 target
= TREE_OPERAND (target
, 0);
2925 else if (TREE_CODE (target
) == ARRAY_REF
2926 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2928 /* Truncate big offset. */
2930 += (TREE_INT_CST_LOW (TYPE_SIZE_UNIT (TREE_TYPE (target
)))
2931 * wi::to_poly_widest (TREE_OPERAND (target
, 1)).force_shwi ());
2932 target
= TREE_OPERAND (target
, 0);
2934 else if (TREE_CODE (target
) == MEM_REF
2935 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2937 offset
+= mem_ref_offset (target
).force_shwi ();
2938 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2940 else if (TREE_CODE (target
) == INDIRECT_REF
2941 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2942 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2944 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2949 switch (TREE_CODE (target
))
2953 x
= DECL_RTL (target
);
2957 x
= gen_rtx_MEM (FUNCTION_MODE
,
2958 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2967 x
= lookup_constant_def (target
);
2968 /* Should have been added by output_addressed_constants. */
2973 /* This deals with absolute addresses. */
2974 offset
+= tree_to_shwi (TREE_OPERAND (target
, 0));
2975 x
= gen_rtx_MEM (QImode
,
2976 gen_rtx_SYMBOL_REF (Pmode
, "origin of addresses"));
2979 case COMPOUND_LITERAL_EXPR
:
2980 gcc_assert (COMPOUND_LITERAL_EXPR_DECL (target
));
2981 x
= DECL_RTL (COMPOUND_LITERAL_EXPR_DECL (target
));
2988 gcc_assert (MEM_P (x
));
2992 value
->offset
= offset
;
2995 static GTY(()) hash_table
<tree_descriptor_hasher
> *const_desc_htab
;
2997 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2999 /* Constant pool accessor function. */
3001 hash_table
<tree_descriptor_hasher
> *
3002 constant_pool_htab (void)
3004 return const_desc_htab
;
3007 /* Compute a hash code for a constant expression. */
3010 tree_descriptor_hasher::hash (constant_descriptor_tree
*ptr
)
3016 const_hash_1 (const tree exp
)
3021 enum tree_code code
= TREE_CODE (exp
);
3023 /* Either set P and LEN to the address and len of something to hash and
3024 exit the switch or return a value. */
3029 p
= (char *) &TREE_INT_CST_ELT (exp
, 0);
3030 len
= TREE_INT_CST_NUNITS (exp
) * sizeof (HOST_WIDE_INT
);
3034 return real_hash (TREE_REAL_CST_PTR (exp
));
3037 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
3040 p
= TREE_STRING_POINTER (exp
);
3041 len
= TREE_STRING_LENGTH (exp
);
3045 return (const_hash_1 (TREE_REALPART (exp
)) * 5
3046 + const_hash_1 (TREE_IMAGPART (exp
)));
3050 hi
= 7 + VECTOR_CST_NPATTERNS (exp
);
3051 hi
= hi
* 563 + VECTOR_CST_NELTS_PER_PATTERN (exp
);
3052 unsigned int count
= vector_cst_encoded_nelts (exp
);
3053 for (unsigned int i
= 0; i
< count
; ++i
)
3054 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ENCODED_ELT (exp
, i
));
3060 unsigned HOST_WIDE_INT idx
;
3063 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
3065 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
3067 hi
= hi
* 603 + const_hash_1 (value
);
3073 if (CONSTANT_CLASS_P (TREE_OPERAND (exp
, 0)))
3074 return const_hash_1 (TREE_OPERAND (exp
, 0));
3079 struct addr_const value
;
3081 decode_addr_const (exp
, &value
);
3082 switch (GET_CODE (value
.base
))
3085 /* Don't hash the address of the SYMBOL_REF;
3086 only use the offset and the symbol name. */
3087 hi
= value
.offset
.coeffs
[0];
3088 p
= XSTR (value
.base
, 0);
3089 for (i
= 0; p
[i
] != 0; i
++)
3090 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3094 hi
= (value
.offset
.coeffs
[0]
3095 + CODE_LABEL_NUMBER (label_ref_label (value
.base
)) * 13);
3105 case POINTER_PLUS_EXPR
:
3107 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
3108 + const_hash_1 (TREE_OPERAND (exp
, 1)));
3111 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
3114 /* A language specific constant. Just hash the code. */
3118 /* Compute hashing function. */
3120 for (i
= 0; i
< len
; i
++)
3121 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3126 /* Wrapper of compare_constant, for the htab interface. */
3128 tree_descriptor_hasher::equal (constant_descriptor_tree
*c1
,
3129 constant_descriptor_tree
*c2
)
3131 if (c1
->hash
!= c2
->hash
)
3133 return compare_constant (c1
->value
, c2
->value
);
3136 /* Compare t1 and t2, and return 1 only if they are known to result in
3137 the same bit pattern on output. */
3140 compare_constant (const tree t1
, const tree t2
)
3142 enum tree_code typecode
;
3144 if (t1
== NULL_TREE
)
3145 return t2
== NULL_TREE
;
3146 if (t2
== NULL_TREE
)
3149 if (TREE_CODE (t1
) != TREE_CODE (t2
))
3152 switch (TREE_CODE (t1
))
3155 /* Integer constants are the same only if the same width of type. */
3156 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3158 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3160 return tree_int_cst_equal (t1
, t2
);
3163 /* Real constants are the same only if the same width of type. In
3164 addition to the same width, we need to check whether the modes are the
3165 same. There might be two floating point modes that are the same size
3166 but have different representations, such as the PowerPC that has 2
3167 different 128-bit floating point types (IBM extended double and IEEE
3168 128-bit floating point). */
3169 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3171 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3173 return real_identical (&TREE_REAL_CST (t1
), &TREE_REAL_CST (t2
));
3176 /* Fixed constants are the same only if the same width of type. */
3177 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3180 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
3183 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
3184 || int_size_in_bytes (TREE_TYPE (t1
))
3185 != int_size_in_bytes (TREE_TYPE (t2
)))
3188 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
3189 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
3190 TREE_STRING_LENGTH (t1
)));
3193 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
3194 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
3198 if (VECTOR_CST_NPATTERNS (t1
)
3199 != VECTOR_CST_NPATTERNS (t2
))
3202 if (VECTOR_CST_NELTS_PER_PATTERN (t1
)
3203 != VECTOR_CST_NELTS_PER_PATTERN (t2
))
3206 unsigned int count
= vector_cst_encoded_nelts (t1
);
3207 for (unsigned int i
= 0; i
< count
; ++i
)
3208 if (!compare_constant (VECTOR_CST_ENCODED_ELT (t1
, i
),
3209 VECTOR_CST_ENCODED_ELT (t2
, i
)))
3217 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
3218 unsigned HOST_WIDE_INT idx
;
3220 typecode
= TREE_CODE (TREE_TYPE (t1
));
3221 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
3224 if (typecode
== ARRAY_TYPE
)
3226 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
3227 /* For arrays, check that mode, size and storage order match. */
3228 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
3230 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
))
3231 || TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (t1
))
3232 != TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (t2
)))
3237 /* For record and union constructors, require exact type
3239 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
3243 v1
= CONSTRUCTOR_ELTS (t1
);
3244 v2
= CONSTRUCTOR_ELTS (t2
);
3245 if (vec_safe_length (v1
) != vec_safe_length (v2
))
3248 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
3250 constructor_elt
*c1
= &(*v1
)[idx
];
3251 constructor_elt
*c2
= &(*v2
)[idx
];
3253 /* Check that each value is the same... */
3254 if (!compare_constant (c1
->value
, c2
->value
))
3256 /* ... and that they apply to the same fields! */
3257 if (typecode
== ARRAY_TYPE
)
3259 if (!compare_constant (c1
->index
, c2
->index
))
3264 if (c1
->index
!= c2
->index
)
3275 struct addr_const value1
, value2
;
3279 decode_addr_const (t1
, &value1
);
3280 decode_addr_const (t2
, &value2
);
3282 if (maybe_ne (value1
.offset
, value2
.offset
))
3285 code
= GET_CODE (value1
.base
);
3286 if (code
!= GET_CODE (value2
.base
))
3292 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3296 ret
= (CODE_LABEL_NUMBER (label_ref_label (value1
.base
))
3297 == CODE_LABEL_NUMBER (label_ref_label (value2
.base
)));
3307 case POINTER_PLUS_EXPR
:
3310 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3311 && compare_constant (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3314 case VIEW_CONVERT_EXPR
:
3315 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3324 /* Return the section into which constant EXP should be placed. */
3327 get_constant_section (tree exp
, unsigned int align
)
3329 return targetm
.asm_out
.select_section (exp
,
3330 compute_reloc_for_constant (exp
),
3334 /* Return the size of constant EXP in bytes. */
3336 static HOST_WIDE_INT
3337 get_constant_size (tree exp
)
3341 size
= int_size_in_bytes (TREE_TYPE (exp
));
3342 gcc_checking_assert (size
>= 0);
3343 gcc_checking_assert (TREE_CODE (exp
) != STRING_CST
3344 || size
>= TREE_STRING_LENGTH (exp
));
3348 /* Subroutine of output_constant_def:
3349 No constant equal to EXP is known to have been output.
3350 Make a constant descriptor to enter EXP in the hash table.
3351 Assign the label number and construct RTL to refer to the
3352 constant's location in memory.
3353 Caller is responsible for updating the hash table. */
3355 static struct constant_descriptor_tree
*
3356 build_constant_desc (tree exp
)
3358 struct constant_descriptor_tree
*desc
;
3364 desc
= ggc_alloc
<constant_descriptor_tree
> ();
3367 /* Create a string containing the label name, in LABEL. */
3368 labelno
= const_labelno
++;
3369 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3371 /* Construct the VAR_DECL associated with the constant. */
3372 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3374 DECL_ARTIFICIAL (decl
) = 1;
3375 DECL_IGNORED_P (decl
) = 1;
3376 TREE_READONLY (decl
) = 1;
3377 TREE_STATIC (decl
) = 1;
3378 TREE_ADDRESSABLE (decl
) = 1;
3379 /* We don't set the RTL yet as this would cause varpool to assume that the
3380 variable is referenced. Moreover, it would just be dropped in LTO mode.
3381 Instead we set the flag that will be recognized in make_decl_rtl. */
3382 DECL_IN_CONSTANT_POOL (decl
) = 1;
3383 DECL_INITIAL (decl
) = desc
->value
;
3384 /* ??? targetm.constant_alignment hasn't been updated for vector types on
3385 most architectures so use DATA_ALIGNMENT as well, except for strings. */
3386 if (TREE_CODE (exp
) == STRING_CST
)
3387 SET_DECL_ALIGN (decl
, targetm
.constant_alignment (exp
, DECL_ALIGN (decl
)));
3389 align_variable (decl
, 0);
3391 /* Now construct the SYMBOL_REF and the MEM. */
3392 if (use_object_blocks_p ())
3394 int align
= (TREE_CODE (decl
) == CONST_DECL
3395 || (VAR_P (decl
) && DECL_IN_CONSTANT_POOL (decl
))
3397 : symtab_node::get (decl
)->definition_alignment ());
3398 section
*sect
= get_constant_section (exp
, align
);
3399 symbol
= create_block_symbol (ggc_strdup (label
),
3400 get_block_for_section (sect
), -1);
3403 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3404 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3405 SET_SYMBOL_REF_DECL (symbol
, decl
);
3406 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3408 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3409 set_mem_attributes (rtl
, exp
, 1);
3410 set_mem_alias_set (rtl
, 0);
3412 /* Putting EXP into the literal pool might have imposed a different
3413 alignment which should be visible in the RTX as well. */
3414 set_mem_align (rtl
, DECL_ALIGN (decl
));
3416 /* We cannot share RTX'es in pool entries.
3417 Mark this piece of RTL as required for unsharing. */
3418 RTX_FLAG (rtl
, used
) = 1;
3420 /* Set flags or add text to the name to record information, such as
3421 that it is a local symbol. If the name is changed, the macro
3422 ASM_OUTPUT_LABELREF will have to know how to strip this
3423 information. This call might invalidate our local variable
3424 SYMBOL; we can't use it afterward. */
3425 targetm
.encode_section_info (exp
, rtl
, true);
3432 /* Subroutine of output_constant_def and tree_output_constant_def:
3433 Add a constant to the hash table that tracks which constants
3434 already have labels. */
3436 static constant_descriptor_tree
*
3437 add_constant_to_table (tree exp
)
3439 /* The hash table methods may call output_constant_def for addressed
3440 constants, so handle them first. */
3441 output_addressed_constants (exp
);
3443 /* Sanity check to catch recursive insertion. */
3444 static bool inserting
;
3445 gcc_assert (!inserting
);
3448 /* Look up EXP in the table of constant descriptors. If we didn't
3449 find it, create a new one. */
3450 struct constant_descriptor_tree key
;
3452 key
.hash
= const_hash_1 (exp
);
3453 constant_descriptor_tree
**loc
3454 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3458 struct constant_descriptor_tree
*desc
= *loc
;
3461 desc
= build_constant_desc (exp
);
3462 desc
->hash
= key
.hash
;
3469 /* Return an rtx representing a reference to constant data in memory
3470 for the constant expression EXP.
3472 If assembler code for such a constant has already been output,
3473 return an rtx to refer to it.
3474 Otherwise, output such a constant in memory
3475 and generate an rtx for it.
3477 If DEFER is nonzero, this constant can be deferred and output only
3478 if referenced in the function after all optimizations.
3480 `const_desc_table' records which constants already have label strings. */
3483 output_constant_def (tree exp
, int defer
)
3485 struct constant_descriptor_tree
*desc
= add_constant_to_table (exp
);
3486 maybe_output_constant_def_contents (desc
, defer
);
3490 /* Subroutine of output_constant_def: Decide whether or not we need to
3491 output the constant DESC now, and if so, do it. */
3493 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3496 rtx symbol
= XEXP (desc
->rtl
, 0);
3497 tree exp
= desc
->value
;
3499 if (flag_syntax_only
)
3502 if (TREE_ASM_WRITTEN (exp
))
3503 /* Already output; don't do it again. */
3506 /* We can always defer constants as long as the context allows
3510 /* Increment n_deferred_constants if it exists. It needs to be at
3511 least as large as the number of constants actually referred to
3512 by the function. If it's too small we'll stop looking too early
3513 and fail to emit constants; if it's too large we'll only look
3514 through the entire function when we could have stopped earlier. */
3516 n_deferred_constants
++;
3520 output_constant_def_contents (symbol
);
3523 /* Subroutine of output_constant_def_contents. Output the definition
3524 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3525 constant's alignment in bits. */
3528 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
,
3533 size
= get_constant_size (exp
);
3535 /* Do any machine/system dependent processing of the constant. */
3536 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3538 /* Output the value of EXP. */
3539 output_constant (exp
, size
, align
, false, merge_strings
);
3541 targetm
.asm_out
.decl_end ();
3544 /* We must output the constant data referred to by SYMBOL; do so. */
3547 output_constant_def_contents (rtx symbol
)
3549 tree decl
= SYMBOL_REF_DECL (symbol
);
3550 tree exp
= DECL_INITIAL (decl
);
3551 bool asan_protected
= false;
3553 /* Make sure any other constants whose addresses appear in EXP
3554 are assigned label numbers. */
3555 output_addressed_constants (exp
);
3557 /* We are no longer deferring this constant. */
3558 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3560 if ((flag_sanitize
& SANITIZE_ADDRESS
)
3561 && TREE_CODE (exp
) == STRING_CST
3562 && asan_protect_global (exp
))
3564 asan_protected
= true;
3565 SET_DECL_ALIGN (decl
, MAX (DECL_ALIGN (decl
),
3566 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
));
3569 /* If the constant is part of an object block, make sure that the
3570 decl has been positioned within its block, but do not write out
3571 its definition yet. output_object_blocks will do that later. */
3572 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3573 place_block_symbol (symbol
);
3576 int align
= (TREE_CODE (decl
) == CONST_DECL
3577 || (VAR_P (decl
) && DECL_IN_CONSTANT_POOL (decl
))
3579 : symtab_node::get (decl
)->definition_alignment ());
3580 section
*sect
= get_constant_section (exp
, align
);
3581 switch_to_section (sect
);
3582 if (align
> BITS_PER_UNIT
)
3583 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3584 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
,
3585 (sect
->common
.flags
& SECTION_MERGE
)
3586 && (sect
->common
.flags
& SECTION_STRINGS
));
3589 HOST_WIDE_INT size
= get_constant_size (exp
);
3590 assemble_zeros (asan_red_zone_size (size
));
3595 /* Look up EXP in the table of constant descriptors. Return the rtl
3596 if it has been emitted, else null. */
3599 lookup_constant_def (tree exp
)
3601 struct constant_descriptor_tree key
;
3604 key
.hash
= const_hash_1 (exp
);
3605 constant_descriptor_tree
*desc
3606 = const_desc_htab
->find_with_hash (&key
, key
.hash
);
3608 return (desc
? desc
->rtl
: NULL_RTX
);
3611 /* Return a tree representing a reference to constant data in memory
3612 for the constant expression EXP.
3614 This is the counterpart of output_constant_def at the Tree level. */
3617 tree_output_constant_def (tree exp
)
3619 struct constant_descriptor_tree
*desc
= add_constant_to_table (exp
);
3620 tree decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3621 varpool_node::finalize_decl (decl
);
3625 class GTY((chain_next ("%h.next"), for_user
)) constant_descriptor_rtx
{
3627 struct constant_descriptor_rtx
*next
;
3631 HOST_WIDE_INT offset
;
3633 fixed_size_mode mode
;
3639 struct const_rtx_desc_hasher
: ggc_ptr_hash
<constant_descriptor_rtx
>
3641 static hashval_t
hash (constant_descriptor_rtx
*);
3642 static bool equal (constant_descriptor_rtx
*, constant_descriptor_rtx
*);
3645 /* Used in the hash tables to avoid outputting the same constant
3646 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3647 are output once per function, not once per file. */
3648 /* ??? Only a few targets need per-function constant pools. Most
3649 can use one per-file pool. Should add a targetm bit to tell the
3652 struct GTY(()) rtx_constant_pool
{
3653 /* Pointers to first and last constant in pool, as ordered by offset. */
3654 struct constant_descriptor_rtx
*first
;
3655 struct constant_descriptor_rtx
*last
;
3657 /* Hash facility for making memory-constants from constant rtl-expressions.
3658 It is used on RISC machines where immediate integer arguments and
3659 constant addresses are restricted so that such constants must be stored
3661 hash_table
<const_rtx_desc_hasher
> *const_rtx_htab
;
3663 /* Current offset in constant pool (does not include any
3664 machine-specific header). */
3665 HOST_WIDE_INT offset
;
3668 /* Hash and compare functions for const_rtx_htab. */
3671 const_rtx_desc_hasher::hash (constant_descriptor_rtx
*desc
)
3677 const_rtx_desc_hasher::equal (constant_descriptor_rtx
*x
,
3678 constant_descriptor_rtx
*y
)
3680 if (x
->mode
!= y
->mode
)
3682 return rtx_equal_p (x
->constant
, y
->constant
);
3685 /* Hash one component of a constant. */
3688 const_rtx_hash_1 (const_rtx x
)
3690 unsigned HOST_WIDE_INT hwi
;
3696 code
= GET_CODE (x
);
3697 mode
= GET_MODE (x
);
3698 h
= (hashval_t
) code
* 1048573 + mode
;
3707 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3708 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3710 h
^= (hashval_t
) hwi
;
3711 for (i
= 1; i
< n
; ++i
)
3714 h
^= (hashval_t
) hwi
;
3719 case CONST_WIDE_INT
:
3722 for (i
= 0; i
< CONST_WIDE_INT_NUNITS (x
); i
++)
3723 hwi
^= CONST_WIDE_INT_ELT (x
, i
);
3728 if (TARGET_SUPPORTS_WIDE_INT
== 0 && mode
== VOIDmode
)
3730 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3734 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3738 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3742 h
^= htab_hash_string (XSTR (x
, 0));
3746 h
= h
* 251 + CODE_LABEL_NUMBER (label_ref_label (x
));
3750 case UNSPEC_VOLATILE
:
3751 h
= h
* 251 + XINT (x
, 1);
3761 /* Compute a hash value for X, which should be a constant. */
3764 const_rtx_hash (rtx x
)
3767 subrtx_iterator::array_type array
;
3768 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
3769 h
= h
* 509 + const_rtx_hash_1 (*iter
);
3774 /* Create and return a new rtx constant pool. */
3776 static struct rtx_constant_pool
*
3777 create_constant_pool (void)
3779 struct rtx_constant_pool
*pool
;
3781 pool
= ggc_alloc
<rtx_constant_pool
> ();
3782 pool
->const_rtx_htab
= hash_table
<const_rtx_desc_hasher
>::create_ggc (31);
3789 /* Initialize constant pool hashing for a new function. */
3792 init_varasm_status (void)
3794 crtl
->varasm
.pool
= create_constant_pool ();
3795 crtl
->varasm
.deferred_constants
= 0;
3798 /* Given a MINUS expression, simplify it if both sides
3799 include the same symbol. */
3802 simplify_subtraction (rtx x
)
3804 rtx r
= simplify_rtx (x
);
3808 /* Given a constant rtx X, make (or find) a memory constant for its value
3809 and return a MEM rtx to refer to it in memory. IN_MODE is the mode
3813 force_const_mem (machine_mode in_mode
, rtx x
)
3815 struct constant_descriptor_rtx
*desc
, tmp
;
3816 struct rtx_constant_pool
*pool
;
3821 constant_descriptor_rtx
**slot
;
3822 fixed_size_mode mode
;
3824 /* We can't force variable-sized objects to memory. */
3825 if (!is_a
<fixed_size_mode
> (in_mode
, &mode
))
3828 /* If we're not allowed to drop X into the constant pool, don't. */
3829 if (targetm
.cannot_force_const_mem (mode
, x
))
3832 /* Record that this function has used a constant pool entry. */
3833 crtl
->uses_const_pool
= 1;
3835 /* Decide which pool to use. */
3836 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3837 ? shared_constant_pool
3838 : crtl
->varasm
.pool
);
3840 /* Lookup the value in the hashtable. */
3843 hash
= const_rtx_hash (x
);
3844 slot
= pool
->const_rtx_htab
->find_slot_with_hash (&tmp
, hash
, INSERT
);
3847 /* If the constant was already present, return its memory. */
3849 return copy_rtx (desc
->mem
);
3851 /* Otherwise, create a new descriptor. */
3852 desc
= ggc_alloc
<constant_descriptor_rtx
> ();
3855 /* Align the location counter as required by EXP's data type. */
3856 machine_mode align_mode
= (mode
== VOIDmode
? word_mode
: mode
);
3857 align
= targetm
.static_rtx_alignment (align_mode
);
3859 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3860 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3863 desc
->constant
= copy_rtx (tmp
.constant
);
3864 desc
->offset
= pool
->offset
;
3867 desc
->align
= align
;
3868 desc
->labelno
= const_labelno
;
3871 pool
->offset
+= GET_MODE_SIZE (mode
);
3873 pool
->last
->next
= desc
;
3875 pool
->first
= pool
->last
= desc
;
3878 /* Create a string containing the label name, in LABEL. */
3879 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3882 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3883 the constants pool. */
3884 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3886 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3887 symbol
= create_block_symbol (ggc_strdup (label
),
3888 get_block_for_section (sect
), -1);
3891 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3893 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3894 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3895 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3897 /* Construct the MEM. */
3898 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3899 set_mem_align (def
, align
);
3901 /* If we're dropping a label to the constant pool, make sure we
3903 if (GET_CODE (x
) == LABEL_REF
)
3904 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3906 return copy_rtx (def
);
3909 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3912 get_pool_constant (const_rtx addr
)
3914 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3917 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3918 and whether it has been output or not. */
3921 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3923 struct constant_descriptor_rtx
*desc
;
3925 desc
= SYMBOL_REF_CONSTANT (addr
);
3926 *pmarked
= (desc
->mark
!= 0);
3927 return desc
->constant
;
3930 /* Similar, return the mode. */
3933 get_pool_mode (const_rtx addr
)
3935 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3938 /* Return TRUE if and only if the constant pool has no entries. Note
3939 that even entries we might end up choosing not to emit are counted
3940 here, so there is the potential for missed optimizations. */
3943 constant_pool_empty_p (void)
3945 return crtl
->varasm
.pool
->first
== NULL
;
3948 /* Worker function for output_constant_pool_1. Emit assembly for X
3949 in MODE with known alignment ALIGN. */
3952 output_constant_pool_2 (fixed_size_mode mode
, rtx x
, unsigned int align
)
3954 switch (GET_MODE_CLASS (mode
))
3957 case MODE_DECIMAL_FLOAT
:
3959 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3960 assemble_real (*CONST_DOUBLE_REAL_VALUE (x
),
3961 as_a
<scalar_float_mode
> (mode
), align
, false);
3966 case MODE_PARTIAL_INT
:
3971 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3974 case MODE_VECTOR_BOOL
:
3976 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3978 /* Pick the smallest integer mode that contains at least one
3979 whole element. Often this is byte_mode and contains more
3980 than one element. */
3981 unsigned int nelts
= GET_MODE_NUNITS (mode
);
3982 unsigned int elt_bits
= GET_MODE_BITSIZE (mode
) / nelts
;
3983 unsigned int int_bits
= MAX (elt_bits
, BITS_PER_UNIT
);
3984 scalar_int_mode int_mode
= int_mode_for_size (int_bits
, 0).require ();
3986 /* Build the constant up one integer at a time. */
3987 unsigned int elts_per_int
= int_bits
/ elt_bits
;
3988 for (unsigned int i
= 0; i
< nelts
; i
+= elts_per_int
)
3990 unsigned HOST_WIDE_INT value
= 0;
3991 unsigned int limit
= MIN (nelts
- i
, elts_per_int
);
3992 for (unsigned int j
= 0; j
< limit
; ++j
)
3993 if (INTVAL (CONST_VECTOR_ELT (x
, i
+ j
)) != 0)
3994 value
|= 1 << (j
* elt_bits
);
3995 output_constant_pool_2 (int_mode
, gen_int_mode (value
, int_mode
),
3996 i
!= 0 ? MIN (align
, int_bits
) : align
);
4000 case MODE_VECTOR_FLOAT
:
4001 case MODE_VECTOR_INT
:
4002 case MODE_VECTOR_FRACT
:
4003 case MODE_VECTOR_UFRACT
:
4004 case MODE_VECTOR_ACCUM
:
4005 case MODE_VECTOR_UACCUM
:
4008 scalar_mode submode
= GET_MODE_INNER (mode
);
4009 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
4011 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
4012 units
= GET_MODE_NUNITS (mode
);
4014 for (i
= 0; i
< units
; i
++)
4016 rtx elt
= CONST_VECTOR_ELT (x
, i
);
4017 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
4027 /* Worker function for output_constant_pool. Emit constant DESC,
4028 giving it ALIGN bits of alignment. */
4031 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
4038 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
4039 whose CODE_LABEL has been deleted. This can occur if a jump table
4040 is eliminated by optimization. If so, write a constant of zero
4041 instead. Note that this can also happen by turning the
4042 CODE_LABEL into a NOTE. */
4043 /* ??? This seems completely and utterly wrong. Certainly it's
4044 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
4045 functioning even with rtx_insn::deleted and friends. */
4048 switch (GET_CODE (tmp
))
4051 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
4052 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
4054 tmp
= XEXP (XEXP (tmp
, 0), 0);
4059 rtx_insn
*insn
= label_ref_label (tmp
);
4060 gcc_assert (!insn
->deleted ());
4061 gcc_assert (!NOTE_P (insn
)
4062 || NOTE_KIND (insn
) != NOTE_INSN_DELETED
);
4070 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
4071 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
4072 align
, desc
->labelno
, done
);
4075 assemble_align (align
);
4077 /* Output the label. */
4078 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
4081 Pass actual alignment value while emitting string constant to asm code
4082 as function 'output_constant_pool_1' explicitly passes the alignment as 1
4083 assuming that the data is already aligned which prevents the generation
4084 of fix-up table entries. */
4085 output_constant_pool_2 (desc
->mode
, x
, desc
->align
);
4087 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
4088 sections have proper size. */
4089 if (align
> GET_MODE_BITSIZE (desc
->mode
)
4091 && (in_section
->common
.flags
& SECTION_MERGE
))
4092 assemble_align (align
);
4094 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
4100 /* Recompute the offsets of entries in POOL, and the overall size of
4101 POOL. Do this after calling mark_constant_pool to ensure that we
4102 are computing the offset values for the pool which we will actually
4106 recompute_pool_offsets (struct rtx_constant_pool
*pool
)
4108 struct constant_descriptor_rtx
*desc
;
4111 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
4114 /* Recalculate offset. */
4115 unsigned int align
= desc
->align
;
4116 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
4117 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
4118 desc
->offset
= pool
->offset
;
4119 pool
->offset
+= GET_MODE_SIZE (desc
->mode
);
4123 /* Mark all constants that are referenced by SYMBOL_REFs in X.
4124 Emit referenced deferred strings. */
4127 mark_constants_in_pattern (rtx insn
)
4129 subrtx_iterator::array_type array
;
4130 FOR_EACH_SUBRTX (iter
, array
, PATTERN (insn
), ALL
)
4132 const_rtx x
= *iter
;
4133 if (GET_CODE (x
) == SYMBOL_REF
)
4135 if (CONSTANT_POOL_ADDRESS_P (x
))
4137 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
4138 if (desc
->mark
== 0)
4141 iter
.substitute (desc
->constant
);
4144 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
4146 tree decl
= SYMBOL_REF_DECL (x
);
4147 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
4149 n_deferred_constants
--;
4150 output_constant_def_contents (CONST_CAST_RTX (x
));
4157 /* Look through appropriate parts of INSN, marking all entries in the
4158 constant pool which are actually being used. Entries that are only
4159 referenced by other constants are also marked as used. Emit
4160 deferred strings that are used. */
4163 mark_constants (rtx_insn
*insn
)
4168 /* Insns may appear inside a SEQUENCE. Only check the patterns of
4169 insns, not any notes that may be attached. We don't want to mark
4170 a constant just because it happens to appear in a REG_EQUIV note. */
4171 if (rtx_sequence
*seq
= dyn_cast
<rtx_sequence
*> (PATTERN (insn
)))
4173 int i
, n
= seq
->len ();
4174 for (i
= 0; i
< n
; ++i
)
4176 rtx subinsn
= seq
->element (i
);
4177 if (INSN_P (subinsn
))
4178 mark_constants_in_pattern (subinsn
);
4182 mark_constants_in_pattern (insn
);
4185 /* Look through the instructions for this function, and mark all the
4186 entries in POOL which are actually being used. Emit deferred constants
4187 which have indeed been used. */
4190 mark_constant_pool (void)
4194 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
4197 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
4198 mark_constants (insn
);
4201 /* Write all the constants in POOL. */
4204 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
4206 struct constant_descriptor_rtx
*desc
;
4208 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
4211 /* If the constant is part of an object_block, make sure that
4212 the constant has been positioned within its block, but do not
4213 write out its definition yet. output_object_blocks will do
4215 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
4216 && SYMBOL_REF_BLOCK (desc
->sym
))
4217 place_block_symbol (desc
->sym
);
4220 switch_to_section (targetm
.asm_out
.select_rtx_section
4221 (desc
->mode
, desc
->constant
, desc
->align
));
4222 output_constant_pool_1 (desc
, desc
->align
);
4227 /* Mark all constants that are used in the current function, then write
4228 out the function's private constant pool. */
4231 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
4232 tree fndecl ATTRIBUTE_UNUSED
)
4234 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
4236 /* It is possible for gcc to call force_const_mem and then to later
4237 discard the instructions which refer to the constant. In such a
4238 case we do not need to output the constant. */
4239 mark_constant_pool ();
4241 /* Having marked the constant pool entries we'll actually emit, we
4242 now need to rebuild the offset information, which may have become
4244 recompute_pool_offsets (pool
);
4246 #ifdef ASM_OUTPUT_POOL_PROLOGUE
4247 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4250 output_constant_pool_contents (pool
);
4252 #ifdef ASM_OUTPUT_POOL_EPILOGUE
4253 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4257 /* Write the contents of the shared constant pool. */
4260 output_shared_constant_pool (void)
4262 output_constant_pool_contents (shared_constant_pool
);
4265 /* Determine what kind of relocations EXP may need. */
4268 compute_reloc_for_constant (tree exp
)
4270 int reloc
= 0, reloc2
;
4273 switch (TREE_CODE (exp
))
4277 /* Go inside any operations that get_inner_reference can handle and see
4278 if what's inside is a constant: no need to do anything here for
4279 addresses of variables or functions. */
4280 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4281 tem
= TREE_OPERAND (tem
, 0))
4284 if (TREE_CODE (tem
) == MEM_REF
4285 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
4287 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
4291 if (!targetm
.binds_local_p (tem
))
4298 case POINTER_PLUS_EXPR
:
4299 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4300 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4304 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4305 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4306 /* The difference of two local labels is computable at link time. */
4307 if (reloc
== 1 && reloc2
== 1)
4314 case VIEW_CONVERT_EXPR
:
4315 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4320 unsigned HOST_WIDE_INT idx
;
4321 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4323 reloc
|= compute_reloc_for_constant (tem
);
4333 /* Find all the constants whose addresses are referenced inside of EXP,
4334 and make sure assembler code with a label has been output for each one.
4335 Indicate whether an ADDR_EXPR has been encountered. */
4338 output_addressed_constants (tree exp
)
4342 switch (TREE_CODE (exp
))
4346 /* Go inside any operations that get_inner_reference can handle and see
4347 if what's inside is a constant: no need to do anything here for
4348 addresses of variables or functions. */
4349 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4350 tem
= TREE_OPERAND (tem
, 0))
4353 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4354 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4355 tem
= DECL_INITIAL (tem
);
4357 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4358 output_constant_def (tem
, 0);
4360 if (TREE_CODE (tem
) == MEM_REF
)
4361 output_addressed_constants (TREE_OPERAND (tem
, 0));
4365 case POINTER_PLUS_EXPR
:
4367 output_addressed_constants (TREE_OPERAND (exp
, 1));
4371 case VIEW_CONVERT_EXPR
:
4372 output_addressed_constants (TREE_OPERAND (exp
, 0));
4377 unsigned HOST_WIDE_INT idx
;
4378 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4380 output_addressed_constants (tem
);
4389 /* Whether a constructor CTOR is a valid static constant initializer if all
4390 its elements are. This used to be internal to initializer_constant_valid_p
4391 and has been exposed to let other functions like categorize_ctor_elements
4392 evaluate the property while walking a constructor for other purposes. */
4395 constructor_static_from_elts_p (const_tree ctor
)
4397 return (TREE_CONSTANT (ctor
)
4398 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4399 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4400 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4403 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4406 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4407 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4408 which are valid when ENDTYPE is an integer of any size; in
4409 particular, this does not accept a pointer minus a constant. This
4410 returns null_pointer_node if the VALUE is an absolute constant
4411 which can be used to initialize a static variable. Otherwise it
4415 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4419 if (!INTEGRAL_TYPE_P (endtype
))
4422 op0
= TREE_OPERAND (value
, 0);
4423 op1
= TREE_OPERAND (value
, 1);
4425 /* Like STRIP_NOPS except allow the operand mode to widen. This
4426 works around a feature of fold that simplifies (int)(p1 - p2) to
4427 ((int)p1 - (int)p2) under the theory that the narrower operation
4430 while (CONVERT_EXPR_P (op0
)
4431 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4433 tree inner
= TREE_OPERAND (op0
, 0);
4434 if (inner
== error_mark_node
4435 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4436 || (GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (op0
)))
4437 > GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (inner
)))))
4442 while (CONVERT_EXPR_P (op1
)
4443 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4445 tree inner
= TREE_OPERAND (op1
, 0);
4446 if (inner
== error_mark_node
4447 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4448 || (GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (op1
)))
4449 > GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (inner
)))))
4454 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4458 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4459 cache
? cache
+ 2 : NULL
);
4460 /* Both initializers must be known. */
4464 && (op0
== null_pointer_node
4465 || TREE_CODE (value
) == MINUS_EXPR
))
4466 return null_pointer_node
;
4468 /* Support differences between labels. */
4469 if (TREE_CODE (op0
) == LABEL_DECL
4470 && TREE_CODE (op1
) == LABEL_DECL
)
4471 return null_pointer_node
;
4473 if (TREE_CODE (op0
) == STRING_CST
4474 && TREE_CODE (op1
) == STRING_CST
4475 && operand_equal_p (op0
, op1
, 1))
4476 return null_pointer_node
;
4482 /* Helper function of initializer_constant_valid_p.
4483 Return nonzero if VALUE is a valid constant-valued expression
4484 for use in initializing a static variable; one that can be an
4485 element of a "constant" initializer.
4487 Return null_pointer_node if the value is absolute;
4488 if it is relocatable, return the variable that determines the relocation.
4489 We assume that VALUE has been folded as much as possible;
4490 therefore, we do not need to check for such things as
4491 arithmetic-combinations of integers.
4493 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4496 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4500 switch (TREE_CODE (value
))
4503 if (constructor_static_from_elts_p (value
))
4505 unsigned HOST_WIDE_INT idx
;
4507 bool absolute
= true;
4509 if (cache
&& cache
[0] == value
)
4511 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4514 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4517 /* An absolute value is required with reverse SSO. */
4518 || (reloc
!= null_pointer_node
4519 && TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (value
))
4520 && !AGGREGATE_TYPE_P (TREE_TYPE (elt
))))
4525 cache
[1] = NULL_TREE
;
4529 if (reloc
!= null_pointer_node
)
4532 /* For a non-absolute relocation, there is no single
4533 variable that can be "the variable that determines the
4538 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4540 return absolute
? null_pointer_node
: error_mark_node
;
4543 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4551 return null_pointer_node
;
4556 tree op0
= staticp (TREE_OPERAND (value
, 0));
4559 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4560 to be a constant, this is old-skool offsetof-like nonsense. */
4561 if (TREE_CODE (op0
) == INDIRECT_REF
4562 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4563 return null_pointer_node
;
4564 /* Taking the address of a nested function involves a trampoline,
4565 unless we don't need or want one. */
4566 if (TREE_CODE (op0
) == FUNCTION_DECL
4567 && DECL_STATIC_CHAIN (op0
)
4568 && !TREE_NO_TRAMPOLINE (value
))
4570 /* "&{...}" requires a temporary to hold the constructed
4572 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4578 case NON_LVALUE_EXPR
:
4579 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4582 case VIEW_CONVERT_EXPR
:
4584 tree src
= TREE_OPERAND (value
, 0);
4585 tree src_type
= TREE_TYPE (src
);
4586 tree dest_type
= TREE_TYPE (value
);
4588 /* Allow view-conversions from aggregate to non-aggregate type only
4589 if the bit pattern is fully preserved afterwards; otherwise, the
4590 RTL expander won't be able to apply a subsequent transformation
4591 to the underlying constructor. */
4592 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4594 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4595 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4600 /* Allow all other kinds of view-conversion. */
4601 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4606 tree src
= TREE_OPERAND (value
, 0);
4607 tree src_type
= TREE_TYPE (src
);
4608 tree dest_type
= TREE_TYPE (value
);
4610 /* Allow conversions between pointer types, floating-point
4611 types, and offset types. */
4612 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4613 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4614 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4615 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4616 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4618 /* Allow length-preserving conversions between integer types. */
4619 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4620 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4621 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4623 /* Allow conversions between other integer types only if
4624 explicit value. Don't allow sign-extension to a type larger
4625 than word and pointer, there aren't relocations that would
4626 allow to sign extend it to a wider type. */
4627 if (INTEGRAL_TYPE_P (dest_type
)
4628 && INTEGRAL_TYPE_P (src_type
)
4629 && (TYPE_UNSIGNED (src_type
)
4630 || TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
)
4631 || TYPE_PRECISION (dest_type
) <= BITS_PER_WORD
4632 || TYPE_PRECISION (dest_type
) <= POINTER_SIZE
))
4634 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4635 if (inner
== null_pointer_node
)
4636 return null_pointer_node
;
4640 /* Allow (int) &foo provided int is as wide as a pointer. */
4641 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4642 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4643 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4645 /* Likewise conversions from int to pointers, but also allow
4646 conversions from 0. */
4647 if ((POINTER_TYPE_P (dest_type
)
4648 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4649 && INTEGRAL_TYPE_P (src_type
))
4651 if (TREE_CODE (src
) == INTEGER_CST
4652 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4653 return null_pointer_node
;
4654 if (integer_zerop (src
))
4655 return null_pointer_node
;
4656 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4657 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4660 /* Allow conversions to struct or union types if the value
4662 if (TREE_CODE (dest_type
) == RECORD_TYPE
4663 || TREE_CODE (dest_type
) == UNION_TYPE
)
4664 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4668 case POINTER_PLUS_EXPR
:
4670 /* Any valid floating-point constants will have been folded by now;
4671 with -frounding-math we hit this with addition of two constants. */
4672 if (TREE_CODE (endtype
) == REAL_TYPE
)
4674 if (cache
&& cache
[0] == value
)
4676 if (! INTEGRAL_TYPE_P (endtype
)
4677 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4679 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4681 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4684 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4685 endtype
, ncache
+ 2);
4686 /* If either term is absolute, use the other term's relocation. */
4687 if (valid0
== null_pointer_node
)
4689 else if (valid1
== null_pointer_node
)
4691 /* Support narrowing pointer differences. */
4693 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4697 /* Support narrowing pointer differences. */
4698 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4706 case POINTER_DIFF_EXPR
:
4708 if (TREE_CODE (endtype
) == REAL_TYPE
)
4710 if (cache
&& cache
[0] == value
)
4712 if (! INTEGRAL_TYPE_P (endtype
)
4713 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4715 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4717 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4720 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4721 endtype
, ncache
+ 2);
4722 /* Win if second argument is absolute. */
4723 if (valid1
== null_pointer_node
)
4725 /* Win if both arguments have the same relocation.
4726 Then the value is absolute. */
4727 else if (valid0
== valid1
&& valid0
!= 0)
4728 ret
= null_pointer_node
;
4729 /* Since GCC guarantees that string constants are unique in the
4730 generated code, a subtraction between two copies of the same
4731 constant string is absolute. */
4732 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4733 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4734 && operand_equal_p (valid0
, valid1
, 1))
4735 ret
= null_pointer_node
;
4736 /* Support narrowing differences. */
4738 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4742 /* Support narrowing differences. */
4743 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4758 /* Return nonzero if VALUE is a valid constant-valued expression
4759 for use in initializing a static variable; one that can be an
4760 element of a "constant" initializer.
4762 Return null_pointer_node if the value is absolute;
4763 if it is relocatable, return the variable that determines the relocation.
4764 We assume that VALUE has been folded as much as possible;
4765 therefore, we do not need to check for such things as
4766 arithmetic-combinations of integers. */
4768 initializer_constant_valid_p (tree value
, tree endtype
, bool reverse
)
4770 tree reloc
= initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4772 /* An absolute value is required with reverse storage order. */
4774 && reloc
!= null_pointer_node
4776 && !AGGREGATE_TYPE_P (endtype
)
4777 && !VECTOR_TYPE_P (endtype
))
4783 /* Return true if VALUE is a valid constant-valued expression
4784 for use in initializing a static bit-field; one that can be
4785 an element of a "constant" initializer. */
4788 initializer_constant_valid_for_bitfield_p (tree value
)
4790 /* For bitfields we support integer constants or possibly nested aggregates
4792 switch (TREE_CODE (value
))
4796 unsigned HOST_WIDE_INT idx
;
4799 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4800 if (!initializer_constant_valid_for_bitfield_p (elt
))
4809 case VIEW_CONVERT_EXPR
:
4810 case NON_LVALUE_EXPR
:
4812 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4821 /* Check if a STRING_CST fits into the field.
4822 Tolerate only the case when the NUL termination
4823 does not fit into the field. */
4826 check_string_literal (tree string
, unsigned HOST_WIDE_INT size
)
4828 tree type
= TREE_TYPE (string
);
4829 tree eltype
= TREE_TYPE (type
);
4830 unsigned HOST_WIDE_INT elts
= tree_to_uhwi (TYPE_SIZE_UNIT (eltype
));
4831 unsigned HOST_WIDE_INT mem_size
= tree_to_uhwi (TYPE_SIZE_UNIT (type
));
4832 int len
= TREE_STRING_LENGTH (string
);
4834 if (elts
!= 1 && elts
!= 2 && elts
!= 4)
4836 if (len
< 0 || len
% elts
!= 0)
4838 if (size
< (unsigned)len
)
4840 if (mem_size
!= size
)
4845 /* output_constructor outer state of relevance in recursive calls, typically
4846 for nested aggregate bitfields. */
4848 struct oc_outer_state
{
4849 unsigned int bit_offset
; /* current position in ... */
4850 int byte
; /* ... the outer byte buffer. */
4853 static unsigned HOST_WIDE_INT
4854 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int, bool,
4857 /* Output assembler code for constant EXP, with no label.
4858 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4859 Assumes output_addressed_constants has been done on EXP already.
4861 Generate at least SIZE bytes of assembler data, padding at the end
4862 with zeros if necessary. SIZE must always be specified. The returned
4863 value is the actual number of bytes of assembler data generated, which
4864 may be bigger than SIZE if the object contains a variable length field.
4866 SIZE is important for structure constructors,
4867 since trailing members may have been omitted from the constructor.
4868 It is also important for initialization of arrays from string constants
4869 since the full length of the string constant might not be wanted.
4870 It is also needed for initialization of unions, where the initializer's
4871 type is just one member, and that may not be as long as the union.
4873 There a case in which we would fail to output exactly SIZE bytes:
4874 for a structure constructor that wants to produce more than SIZE bytes.
4875 But such constructors will never be generated for any possible input.
4877 ALIGN is the alignment of the data in bits.
4879 If REVERSE is true, EXP is output in reverse storage order. */
4881 static unsigned HOST_WIDE_INT
4882 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
,
4883 bool reverse
, bool merge_strings
)
4885 enum tree_code code
;
4886 unsigned HOST_WIDE_INT thissize
;
4889 if (size
== 0 || flag_syntax_only
)
4892 /* See if we're trying to initialize a pointer in a non-default mode
4893 to the address of some declaration somewhere. If the target says
4894 the mode is valid for pointers, assume the target has a way of
4896 if (TREE_CODE (exp
) == NOP_EXPR
4897 && POINTER_TYPE_P (TREE_TYPE (exp
))
4898 && targetm
.addr_space
.valid_pointer_mode
4899 (SCALAR_INT_TYPE_MODE (TREE_TYPE (exp
)),
4900 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4902 tree saved_type
= TREE_TYPE (exp
);
4904 /* Peel off any intermediate conversions-to-pointer for valid
4906 while (TREE_CODE (exp
) == NOP_EXPR
4907 && POINTER_TYPE_P (TREE_TYPE (exp
))
4908 && targetm
.addr_space
.valid_pointer_mode
4909 (SCALAR_INT_TYPE_MODE (TREE_TYPE (exp
)),
4910 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4911 exp
= TREE_OPERAND (exp
, 0);
4913 /* If what we're left with is the address of something, we can
4914 convert the address to the final type and output it that
4916 if (TREE_CODE (exp
) == ADDR_EXPR
)
4917 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4918 /* Likewise for constant ints. */
4919 else if (TREE_CODE (exp
) == INTEGER_CST
)
4920 exp
= fold_convert (saved_type
, exp
);
4924 /* Eliminate any conversions since we'll be outputting the underlying
4926 while (CONVERT_EXPR_P (exp
)
4927 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4928 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4930 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4931 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4933 /* Make sure eliminating the conversion is really a no-op, except with
4934 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4935 union types to allow for Ada unchecked unions. */
4936 if (type_size
> op_size
4937 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4938 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4939 /* Keep the conversion. */
4942 exp
= TREE_OPERAND (exp
, 0);
4945 code
= TREE_CODE (TREE_TYPE (exp
));
4946 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4948 /* Allow a constructor with no elements for any data type.
4949 This means to fill the space with zeros. */
4950 if (TREE_CODE (exp
) == CONSTRUCTOR
4951 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4953 assemble_zeros (size
);
4957 if (TREE_CODE (exp
) == FDESC_EXPR
)
4959 #ifdef ASM_OUTPUT_FDESC
4960 HOST_WIDE_INT part
= tree_to_shwi (TREE_OPERAND (exp
, 1));
4961 tree decl
= TREE_OPERAND (exp
, 0);
4962 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4969 /* Now output the underlying data. If we've handling the padding, return.
4970 Otherwise, break and ensure SIZE is the size written. */
4977 case REFERENCE_TYPE
:
4979 case FIXED_POINT_TYPE
:
4981 cst
= expand_expr (exp
, NULL_RTX
, VOIDmode
, EXPAND_INITIALIZER
);
4983 cst
= flip_storage_order (TYPE_MODE (TREE_TYPE (exp
)), cst
);
4984 if (!assemble_integer (cst
, MIN (size
, thissize
), align
, 0))
4985 error ("initializer for integer/fixed-point value is too complicated");
4989 if (TREE_CODE (exp
) != REAL_CST
)
4990 error ("initializer for floating value is not a floating constant");
4992 assemble_real (TREE_REAL_CST (exp
),
4993 SCALAR_FLOAT_TYPE_MODE (TREE_TYPE (exp
)),
4998 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
,
5000 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
5001 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)),
5007 switch (TREE_CODE (exp
))
5010 return output_constructor (exp
, size
, align
, reverse
, NULL
);
5012 thissize
= (unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
);
5015 || TREE_STRING_POINTER (exp
) [thissize
- 1] != '\0'))
5017 gcc_checking_assert (check_string_literal (exp
, size
));
5018 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
5022 scalar_mode inner
= SCALAR_TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
5023 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
5024 int elt_size
= GET_MODE_SIZE (inner
);
5025 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
,
5027 thissize
= elt_size
;
5028 /* Static constants must have a fixed size. */
5029 unsigned int nunits
= VECTOR_CST_NELTS (exp
).to_constant ();
5030 for (unsigned int i
= 1; i
< nunits
; i
++)
5032 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
,
5034 thissize
+= elt_size
;
5045 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
5046 return output_constructor (exp
, size
, align
, reverse
, NULL
);
5055 if (size
> thissize
)
5056 assemble_zeros (size
- thissize
);
5061 /* Subroutine of output_constructor, used for computing the size of
5062 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
5063 type with an unspecified upper bound. */
5065 static unsigned HOST_WIDE_INT
5066 array_size_for_constructor (tree val
)
5069 unsigned HOST_WIDE_INT cnt
;
5070 tree index
, value
, tmp
;
5073 /* This code used to attempt to handle string constants that are not
5074 arrays of single-bytes, but nothing else does, so there's no point in
5076 if (TREE_CODE (val
) == STRING_CST
)
5077 return TREE_STRING_LENGTH (val
);
5079 max_index
= NULL_TREE
;
5080 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
5082 if (TREE_CODE (index
) == RANGE_EXPR
)
5083 index
= TREE_OPERAND (index
, 1);
5084 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
5088 if (max_index
== NULL_TREE
)
5091 /* Compute the total number of array elements. */
5092 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
5093 i
= wi::to_offset (max_index
) - wi::to_offset (tmp
) + 1;
5095 /* Multiply by the array element unit size to find number of bytes. */
5096 i
*= wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
5098 gcc_assert (wi::fits_uhwi_p (i
));
5099 return i
.to_uhwi ();
5102 /* Other datastructures + helpers for output_constructor. */
5104 /* output_constructor local state to support interaction with helpers. */
5106 struct oc_local_state
{
5108 /* Received arguments. */
5109 tree exp
; /* Constructor expression. */
5110 tree type
; /* Type of constructor expression. */
5111 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
5112 unsigned int align
; /* Known initial alignment. */
5113 tree min_index
; /* Lower bound if specified for an array. */
5115 /* Output processing state. */
5116 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
5117 int byte
; /* Part of a bitfield byte yet to be output. */
5118 int last_relative_index
; /* Implicit or explicit index of the last
5119 array element output within a bitfield. */
5120 bool byte_buffer_in_use
; /* Whether BYTE is in use. */
5121 bool reverse
; /* Whether reverse storage order is in use. */
5123 /* Current element. */
5124 tree field
; /* Current field decl in a record. */
5125 tree val
; /* Current element value. */
5126 tree index
; /* Current element index. */
5130 /* Helper for output_constructor. From the current LOCAL state, output a
5131 RANGE_EXPR element. */
5134 output_constructor_array_range (oc_local_state
*local
)
5136 unsigned HOST_WIDE_INT fieldsize
5137 = int_size_in_bytes (TREE_TYPE (local
->type
));
5139 HOST_WIDE_INT lo_index
5140 = tree_to_shwi (TREE_OPERAND (local
->index
, 0));
5141 HOST_WIDE_INT hi_index
5142 = tree_to_shwi (TREE_OPERAND (local
->index
, 1));
5143 HOST_WIDE_INT index
;
5146 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
5148 for (index
= lo_index
; index
<= hi_index
; index
++)
5150 /* Output the element's initial value. */
5151 if (local
->val
== NULL_TREE
)
5152 assemble_zeros (fieldsize
);
5154 fieldsize
= output_constant (local
->val
, fieldsize
, align2
,
5155 local
->reverse
, false);
5157 /* Count its size. */
5158 local
->total_bytes
+= fieldsize
;
5162 /* Helper for output_constructor. From the current LOCAL state, output a
5163 field element that is not true bitfield or part of an outer one. */
5166 output_constructor_regular_field (oc_local_state
*local
)
5168 /* Field size and position. Since this structure is static, we know the
5169 positions are constant. */
5170 unsigned HOST_WIDE_INT fieldsize
;
5171 HOST_WIDE_INT fieldpos
;
5173 unsigned int align2
;
5175 /* Output any buffered-up bit-fields preceding this element. */
5176 if (local
->byte_buffer_in_use
)
5178 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5179 local
->total_bytes
++;
5180 local
->byte_buffer_in_use
= false;
5183 if (local
->index
!= NULL_TREE
)
5185 /* Perform the index calculation in modulo arithmetic but
5186 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
5187 but we are using an unsigned sizetype. */
5188 unsigned prec
= TYPE_PRECISION (sizetype
);
5189 offset_int idx
= wi::sext (wi::to_offset (local
->index
)
5190 - wi::to_offset (local
->min_index
), prec
);
5191 fieldpos
= (idx
* wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
))))
5194 else if (local
->field
!= NULL_TREE
)
5195 fieldpos
= int_byte_position (local
->field
);
5199 /* Advance to offset of this element.
5200 Note no alignment needed in an array, since that is guaranteed
5201 if each element has the proper size. */
5202 if (local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
5204 if (fieldpos
> local
->total_bytes
)
5206 assemble_zeros (fieldpos
- local
->total_bytes
);
5207 local
->total_bytes
= fieldpos
;
5210 /* Must not go backwards. */
5211 gcc_assert (fieldpos
== local
->total_bytes
);
5214 /* Find the alignment of this element. */
5215 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
5217 /* Determine size this element should occupy. */
5222 /* If this is an array with an unspecified upper bound,
5223 the initializer determines the size. */
5224 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
5225 but we cannot do this until the deprecated support for
5226 initializing zero-length array members is removed. */
5227 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
5228 && (!TYPE_DOMAIN (TREE_TYPE (local
->field
))
5229 || !TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
)))))
5231 fieldsize
= array_size_for_constructor (local
->val
);
5232 /* Given a non-empty initialization, this field had better
5233 be last. Given a flexible array member, the next field
5234 on the chain is a TYPE_DECL of the enclosing struct. */
5235 const_tree next
= DECL_CHAIN (local
->field
);
5236 gcc_assert (!fieldsize
|| !next
|| TREE_CODE (next
) != FIELD_DECL
);
5237 tree size
= TYPE_SIZE_UNIT (TREE_TYPE (local
->val
));
5238 gcc_checking_assert (compare_tree_int (size
, fieldsize
) == 0);
5241 fieldsize
= tree_to_uhwi (DECL_SIZE_UNIT (local
->field
));
5244 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
5246 /* Output the element's initial value. */
5247 if (local
->val
== NULL_TREE
)
5248 assemble_zeros (fieldsize
);
5250 fieldsize
= output_constant (local
->val
, fieldsize
, align2
,
5251 local
->reverse
, false);
5253 /* Count its size. */
5254 local
->total_bytes
+= fieldsize
;
5257 /* Helper for output_constructor. From the LOCAL state, output an element
5258 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
5259 from the start of a possibly ongoing outer byte buffer. */
5262 output_constructor_bitfield (oc_local_state
*local
, unsigned int bit_offset
)
5264 /* Bit size of this element. */
5265 HOST_WIDE_INT ebitsize
5267 ? tree_to_uhwi (DECL_SIZE (local
->field
))
5268 : tree_to_uhwi (TYPE_SIZE (TREE_TYPE (local
->type
))));
5270 /* Relative index of this element if this is an array component. */
5271 HOST_WIDE_INT relative_index
5274 ? (tree_to_shwi (local
->index
)
5275 - tree_to_shwi (local
->min_index
))
5276 : local
->last_relative_index
+ 1)
5279 /* Bit position of this element from the start of the containing
5281 HOST_WIDE_INT constructor_relative_ebitpos
5283 ? int_bit_position (local
->field
)
5284 : ebitsize
* relative_index
);
5286 /* Bit position of this element from the start of a possibly ongoing
5287 outer byte buffer. */
5288 HOST_WIDE_INT byte_relative_ebitpos
5289 = bit_offset
+ constructor_relative_ebitpos
;
5291 /* From the start of a possibly ongoing outer byte buffer, offsets to
5292 the first bit of this element and to the first bit past the end of
5294 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
5295 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
5297 local
->last_relative_index
= relative_index
;
5299 if (local
->val
== NULL_TREE
)
5300 local
->val
= integer_zero_node
;
5302 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
5303 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
5304 local
->val
= TREE_OPERAND (local
->val
, 0);
5306 if (TREE_CODE (local
->val
) != INTEGER_CST
5307 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
5309 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
5313 /* If this field does not start in this (or next) byte, skip some bytes. */
5314 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5316 /* Output remnant of any bit field in previous bytes. */
5317 if (local
->byte_buffer_in_use
)
5319 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5320 local
->total_bytes
++;
5321 local
->byte_buffer_in_use
= false;
5324 /* If still not at proper byte, advance to there. */
5325 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5327 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
5328 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
5329 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
5333 /* Set up the buffer if necessary. */
5334 if (!local
->byte_buffer_in_use
)
5338 local
->byte_buffer_in_use
= true;
5341 /* If this is nested constructor, recurse passing the bit offset and the
5342 pending data, then retrieve the new pending data afterwards. */
5343 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
5345 oc_outer_state temp_state
;
5346 temp_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
5347 temp_state
.byte
= local
->byte
;
5349 += output_constructor (local
->val
, 0, 0, local
->reverse
, &temp_state
);
5350 local
->byte
= temp_state
.byte
;
5354 /* Otherwise, we must split the element into pieces that fall within
5355 separate bytes, and combine each byte with previous or following
5357 while (next_offset
< end_offset
)
5361 unsigned HOST_WIDE_INT value
;
5362 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
5363 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
5365 /* Advance from byte to byte within this element when necessary. */
5366 while (next_byte
!= local
->total_bytes
)
5368 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5369 local
->total_bytes
++;
5373 /* Number of bits we can process at once (all part of the same byte). */
5374 this_time
= MIN (end_offset
- next_offset
, BITS_PER_UNIT
- next_bit
);
5375 if (local
->reverse
? !BYTES_BIG_ENDIAN
: BYTES_BIG_ENDIAN
)
5377 /* For big-endian data, take the most significant bits (of the
5378 bits that are significant) first and put them into bytes from
5379 the most significant end. */
5380 shift
= end_offset
- next_offset
- this_time
;
5382 /* Don't try to take a bunch of bits that cross
5383 the word boundary in the INTEGER_CST. We can
5384 only select bits from one element. */
5385 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5386 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5388 const int end
= shift
+ this_time
- 1;
5389 shift
= end
& -HOST_BITS_PER_WIDE_INT
;
5390 this_time
= end
- shift
+ 1;
5393 /* Now get the bits we want to insert. */
5394 value
= wi::extract_uhwi (wi::to_widest (local
->val
),
5397 /* Get the result. This works only when:
5398 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5399 local
->byte
|= value
<< (BITS_PER_UNIT
- this_time
- next_bit
);
5403 /* On little-endian machines, take the least significant bits of
5404 the value first and pack them starting at the least significant
5405 bits of the bytes. */
5406 shift
= next_offset
- byte_relative_ebitpos
;
5408 /* Don't try to take a bunch of bits that cross
5409 the word boundary in the INTEGER_CST. We can
5410 only select bits from one element. */
5411 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5412 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5414 = HOST_BITS_PER_WIDE_INT
- (shift
& (HOST_BITS_PER_WIDE_INT
- 1));
5416 /* Now get the bits we want to insert. */
5417 value
= wi::extract_uhwi (wi::to_widest (local
->val
),
5420 /* Get the result. This works only when:
5421 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5422 local
->byte
|= value
<< next_bit
;
5425 next_offset
+= this_time
;
5426 local
->byte_buffer_in_use
= true;
5430 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5431 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5432 caller output state of relevance in recursive invocations. */
5434 static unsigned HOST_WIDE_INT
5435 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
,
5436 bool reverse
, oc_outer_state
*outer
)
5438 unsigned HOST_WIDE_INT cnt
;
5439 constructor_elt
*ce
;
5440 oc_local_state local
;
5442 /* Setup our local state to communicate with helpers. */
5444 local
.type
= TREE_TYPE (exp
);
5446 local
.align
= align
;
5447 if (TREE_CODE (local
.type
) == ARRAY_TYPE
&& TYPE_DOMAIN (local
.type
))
5448 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5450 local
.min_index
= integer_zero_node
;
5452 local
.total_bytes
= 0;
5453 local
.byte_buffer_in_use
= outer
!= NULL
;
5454 local
.byte
= outer
? outer
->byte
: 0;
5455 local
.last_relative_index
= -1;
5456 /* The storage order is specified for every aggregate type. */
5457 if (AGGREGATE_TYPE_P (local
.type
))
5458 local
.reverse
= TYPE_REVERSE_STORAGE_ORDER (local
.type
);
5460 local
.reverse
= reverse
;
5462 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5464 /* As CE goes through the elements of the constant, FIELD goes through the
5465 structure fields if the constant is a structure. If the constant is a
5466 union, we override this by getting the field from the TREE_LIST element.
5467 But the constant could also be an array. Then FIELD is zero.
5469 There is always a maximum of one element in the chain LINK for unions
5470 (even if the initializer in a source program incorrectly contains
5473 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5474 local
.field
= TYPE_FIELDS (local
.type
);
5476 local
.field
= NULL_TREE
;
5479 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5480 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5482 local
.val
= ce
->value
;
5483 local
.index
= NULL_TREE
;
5485 /* The element in a union constructor specifies the proper field
5487 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5488 local
.field
= ce
->index
;
5490 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5491 local
.index
= ce
->index
;
5493 if (local
.field
&& flag_verbose_asm
)
5494 fprintf (asm_out_file
, "%s %s:\n",
5496 DECL_NAME (local
.field
)
5497 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5500 /* Eliminate the marker that makes a cast not be an lvalue. */
5501 if (local
.val
!= NULL_TREE
)
5502 STRIP_NOPS (local
.val
);
5504 /* Output the current element, using the appropriate helper ... */
5506 /* For an array slice not part of an outer bitfield. */
5508 && local
.index
!= NULL_TREE
5509 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5510 output_constructor_array_range (&local
);
5512 /* For a field that is neither a true bitfield nor part of an outer one,
5513 known to be at least byte aligned and multiple-of-bytes long. */
5515 && (local
.field
== NULL_TREE
5516 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5517 output_constructor_regular_field (&local
);
5519 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5520 supported for scalar fields, so we may need to convert first. */
5523 if (TREE_CODE (local
.val
) == REAL_CST
)
5525 = fold_unary (VIEW_CONVERT_EXPR
,
5526 build_nonstandard_integer_type
5527 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5529 output_constructor_bitfield (&local
, outer
? outer
->bit_offset
: 0);
5533 /* If we are not at toplevel, save the pending data for our caller.
5534 Otherwise output the pending data and padding zeros as needed. */
5536 outer
->byte
= local
.byte
;
5539 if (local
.byte_buffer_in_use
)
5541 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5542 local
.total_bytes
++;
5545 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5547 assemble_zeros (local
.size
- local
.total_bytes
);
5548 local
.total_bytes
= local
.size
;
5552 return local
.total_bytes
;
5555 /* Mark DECL as weak. */
5558 mark_weak (tree decl
)
5560 if (DECL_WEAK (decl
))
5563 struct symtab_node
*n
= symtab_node::get (decl
);
5564 if (n
&& n
->refuse_visibility_changes
)
5565 error ("%+qD declared weak after being used", decl
);
5566 DECL_WEAK (decl
) = 1;
5568 if (DECL_RTL_SET_P (decl
)
5569 && MEM_P (DECL_RTL (decl
))
5570 && XEXP (DECL_RTL (decl
), 0)
5571 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5572 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5575 /* Merge weak status between NEWDECL and OLDDECL. */
5578 merge_weak (tree newdecl
, tree olddecl
)
5580 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5582 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5585 /* We put the NEWDECL on the weak_decls list at some point
5586 and OLDDECL as well. Keep just OLDDECL on the list. */
5587 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5588 if (TREE_VALUE (*pwd
) == newdecl
)
5590 *pwd
= TREE_CHAIN (*pwd
);
5597 if (DECL_WEAK (newdecl
))
5601 /* NEWDECL is weak, but OLDDECL is not. */
5603 /* If we already output the OLDDECL, we're in trouble; we can't
5604 go back and make it weak. This should never happen in
5605 unit-at-a-time compilation. */
5606 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5608 /* If we've already generated rtl referencing OLDDECL, we may
5609 have done so in a way that will not function properly with
5610 a weak symbol. Again in unit-at-a-time this should be
5612 gcc_assert (!TREE_USED (olddecl
)
5613 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5615 /* PR 49899: You cannot convert a static function into a weak, public function. */
5616 if (! TREE_PUBLIC (olddecl
) && TREE_PUBLIC (newdecl
))
5617 error ("weak declaration of %q+D being applied to a already "
5618 "existing, static definition", newdecl
);
5620 if (TARGET_SUPPORTS_WEAK
)
5622 /* We put the NEWDECL on the weak_decls list at some point.
5623 Replace it with the OLDDECL. */
5624 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5625 if (TREE_VALUE (wd
) == newdecl
)
5627 TREE_VALUE (wd
) = olddecl
;
5630 /* We may not find the entry on the list. If NEWDECL is a
5631 weak alias, then we will have already called
5632 globalize_decl to remove the entry; in that case, we do
5633 not need to do anything. */
5636 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5637 mark_weak (olddecl
);
5640 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5641 weak. Just update NEWDECL to indicate that it's weak too. */
5642 mark_weak (newdecl
);
5645 /* Declare DECL to be a weak symbol. */
5648 declare_weak (tree decl
)
5650 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5651 if (! TREE_PUBLIC (decl
))
5653 error ("weak declaration of %q+D must be public", decl
);
5656 else if (!TARGET_SUPPORTS_WEAK
)
5657 warning (0, "weak declaration of %q+D not supported", decl
);
5660 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5661 DECL_ATTRIBUTES (decl
)
5662 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5666 weak_finish_1 (tree decl
)
5668 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5669 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5672 if (! TREE_USED (decl
))
5675 #ifdef ASM_WEAKEN_DECL
5676 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5678 #ifdef ASM_WEAKEN_LABEL
5679 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5681 #ifdef ASM_OUTPUT_WEAK_ALIAS
5683 static bool warn_once
= 0;
5686 warning (0, "only weak aliases are supported in this configuration");
5696 /* Fiven an assembly name, find the decl it is associated with. */
5698 find_decl (tree target
)
5700 symtab_node
*node
= symtab_node::get_for_asmname (target
);
5706 /* This TREE_LIST contains weakref targets. */
5708 static GTY(()) tree weakref_targets
;
5710 /* Emit any pending weak declarations. */
5717 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5719 tree alias_decl
= TREE_PURPOSE (t
);
5720 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5722 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
))
5723 || TREE_SYMBOL_REFERENCED (target
))
5724 /* Remove alias_decl from the weak list, but leave entries for
5725 the target alone. */
5727 #ifndef ASM_OUTPUT_WEAKREF
5728 else if (! TREE_SYMBOL_REFERENCED (target
))
5730 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5731 defined, otherwise we and weak_finish_1 would use
5732 different macros. */
5733 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5734 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5736 tree decl
= find_decl (target
);
5740 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5741 TREE_CODE (alias_decl
), target
,
5742 TREE_TYPE (alias_decl
));
5744 DECL_EXTERNAL (decl
) = 1;
5745 TREE_PUBLIC (decl
) = 1;
5746 DECL_ARTIFICIAL (decl
) = 1;
5747 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5748 TREE_USED (decl
) = 1;
5751 weak_finish_1 (decl
);
5760 /* Remove the alias and the target from the pending weak list
5761 so that we do not emit any .weak directives for the former,
5762 nor multiple .weak directives for the latter. */
5763 for (p
= &weak_decls
; (t2
= *p
) ; )
5765 if (TREE_VALUE (t2
) == alias_decl
5766 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5767 *p
= TREE_CHAIN (t2
);
5769 p
= &TREE_CHAIN (t2
);
5772 /* Remove other weakrefs to the same target, to speed things up. */
5773 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5775 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5776 *p
= TREE_CHAIN (t2
);
5778 p
= &TREE_CHAIN (t2
);
5783 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5785 tree decl
= TREE_VALUE (t
);
5787 weak_finish_1 (decl
);
5791 /* Emit the assembly bits to indicate that DECL is globally visible. */
5794 globalize_decl (tree decl
)
5797 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5798 if (DECL_WEAK (decl
))
5800 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5803 #ifdef ASM_WEAKEN_DECL
5804 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5806 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5809 /* Remove this function from the pending weak list so that
5810 we do not emit multiple .weak directives for it. */
5811 for (p
= &weak_decls
; (t
= *p
) ; )
5813 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5814 *p
= TREE_CHAIN (t
);
5816 p
= &TREE_CHAIN (t
);
5819 /* Remove weakrefs to the same target from the pending weakref
5820 list, for the same reason. */
5821 for (p
= &weakref_targets
; (t
= *p
) ; )
5823 if (DECL_ASSEMBLER_NAME (decl
)
5824 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5825 *p
= TREE_CHAIN (t
);
5827 p
= &TREE_CHAIN (t
);
5834 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5837 vec
<alias_pair
, va_gc
> *alias_pairs
;
5839 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5840 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5841 tree node is DECL to have the value of the tree node TARGET. */
5844 do_assemble_alias (tree decl
, tree target
)
5848 /* Emulated TLS had better not get this var. */
5849 gcc_assert (!(!targetm
.have_tls
5851 && DECL_THREAD_LOCAL_P (decl
)));
5853 if (TREE_ASM_WRITTEN (decl
))
5856 id
= DECL_ASSEMBLER_NAME (decl
);
5857 ultimate_transparent_alias_target (&id
);
5858 ultimate_transparent_alias_target (&target
);
5860 /* We must force creation of DECL_RTL for debug info generation, even though
5861 we don't use it here. */
5862 make_decl_rtl (decl
);
5864 TREE_ASM_WRITTEN (decl
) = 1;
5865 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5866 TREE_ASM_WRITTEN (id
) = 1;
5868 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5870 if (!TREE_SYMBOL_REFERENCED (target
))
5871 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5873 #ifdef ASM_OUTPUT_WEAKREF
5874 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5875 IDENTIFIER_POINTER (id
),
5876 IDENTIFIER_POINTER (target
));
5878 if (!TARGET_SUPPORTS_WEAK
)
5880 error_at (DECL_SOURCE_LOCATION (decl
),
5881 "weakref is not supported in this configuration");
5888 #ifdef ASM_OUTPUT_DEF
5889 tree orig_decl
= decl
;
5891 /* Make name accessible from other files, if appropriate. */
5893 if (TREE_PUBLIC (decl
) || TREE_PUBLIC (orig_decl
))
5895 globalize_decl (decl
);
5896 maybe_assemble_visibility (decl
);
5898 if (TREE_CODE (decl
) == FUNCTION_DECL
5899 && cgraph_node::get (decl
)->ifunc_resolver
)
5901 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5902 if (targetm
.has_ifunc_p ())
5903 ASM_OUTPUT_TYPE_DIRECTIVE
5904 (asm_out_file
, IDENTIFIER_POINTER (id
),
5908 error_at (DECL_SOURCE_LOCATION (decl
),
5909 "%qs is not supported on this target", "ifunc");
5912 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5913 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5915 ASM_OUTPUT_DEF (asm_out_file
,
5916 IDENTIFIER_POINTER (id
),
5917 IDENTIFIER_POINTER (target
));
5919 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5924 name
= IDENTIFIER_POINTER (id
);
5925 # ifdef ASM_WEAKEN_DECL
5926 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5928 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5930 /* Remove this function from the pending weak list so that
5931 we do not emit multiple .weak directives for it. */
5932 for (p
= &weak_decls
; (t
= *p
) ; )
5933 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
))
5934 || id
== DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5935 *p
= TREE_CHAIN (t
);
5937 p
= &TREE_CHAIN (t
);
5939 /* Remove weakrefs to the same target from the pending weakref
5940 list, for the same reason. */
5941 for (p
= &weakref_targets
; (t
= *p
) ; )
5943 if (id
== ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5944 *p
= TREE_CHAIN (t
);
5946 p
= &TREE_CHAIN (t
);
5952 /* Emit an assembler directive to make the symbol for DECL an alias to
5953 the symbol for TARGET. */
5956 assemble_alias (tree decl
, tree target
)
5960 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5962 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5964 ultimate_transparent_alias_target (&target
);
5966 if (alias
== target
)
5967 error ("%qs symbol %q+D ultimately targets itself", "weakref", decl
);
5968 if (TREE_PUBLIC (decl
))
5969 error ("%qs symbol %q+D must have static linkage", "weakref", decl
);
5973 #if !defined (ASM_OUTPUT_DEF)
5974 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5975 error_at (DECL_SOURCE_LOCATION (decl
),
5976 "alias definitions not supported in this configuration");
5977 TREE_ASM_WRITTEN (decl
) = 1;
5980 if (!DECL_WEAK (decl
))
5982 /* NB: ifunc_resolver isn't set when an error is detected. */
5983 if (TREE_CODE (decl
) == FUNCTION_DECL
5984 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5985 error_at (DECL_SOURCE_LOCATION (decl
),
5986 "%qs is not supported in this configuration", "ifunc");
5988 error_at (DECL_SOURCE_LOCATION (decl
),
5989 "only weak aliases are supported in this configuration");
5990 TREE_ASM_WRITTEN (decl
) = 1;
5996 TREE_USED (decl
) = 1;
5998 /* Allow aliases to aliases. */
5999 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6000 cgraph_node::get_create (decl
)->alias
= true;
6002 varpool_node::get_create (decl
)->alias
= true;
6004 /* If the target has already been emitted, we don't have to queue the
6005 alias. This saves a tad of memory. */
6006 if (symtab
->global_info_ready
)
6007 target_decl
= find_decl (target
);
6010 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
6011 || symtab
->state
>= EXPANSION
)
6012 do_assemble_alias (decl
, target
);
6015 alias_pair p
= {decl
, target
};
6016 vec_safe_push (alias_pairs
, p
);
6020 /* Record and output a table of translations from original function
6021 to its transaction aware clone. Note that tm_pure functions are
6022 considered to be their own clone. */
6024 struct tm_clone_hasher
: ggc_cache_ptr_hash
<tree_map
>
6026 static hashval_t
hash (tree_map
*m
) { return tree_map_hash (m
); }
6027 static bool equal (tree_map
*a
, tree_map
*b
) { return tree_map_eq (a
, b
); }
6030 keep_cache_entry (tree_map
*&e
)
6032 return ggc_marked_p (e
->base
.from
);
6036 static GTY((cache
)) hash_table
<tm_clone_hasher
> *tm_clone_hash
;
6039 record_tm_clone_pair (tree o
, tree n
)
6041 struct tree_map
**slot
, *h
;
6043 if (tm_clone_hash
== NULL
)
6044 tm_clone_hash
= hash_table
<tm_clone_hasher
>::create_ggc (32);
6046 h
= ggc_alloc
<tree_map
> ();
6047 h
->hash
= htab_hash_pointer (o
);
6051 slot
= tm_clone_hash
->find_slot_with_hash (h
, h
->hash
, INSERT
);
6056 get_tm_clone_pair (tree o
)
6060 struct tree_map
*h
, in
;
6063 in
.hash
= htab_hash_pointer (o
);
6064 h
= tm_clone_hash
->find_with_hash (&in
, in
.hash
);
6071 struct tm_alias_pair
6079 /* Dump the actual pairs to the .tm_clone_table section. */
6082 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
6086 bool switched
= false;
6088 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
6092 struct cgraph_node
*src_n
= cgraph_node::get (src
);
6093 struct cgraph_node
*dst_n
= cgraph_node::get (dst
);
6095 /* The function ipa_tm_create_version() marks the clone as needed if
6096 the original function was needed. But we also mark the clone as
6097 needed if we ever called the clone indirectly through
6098 TM_GETTMCLONE. If neither of these are true, we didn't generate
6099 a clone, and we didn't call it indirectly... no sense keeping it
6100 in the clone table. */
6101 if (!dst_n
|| !dst_n
->definition
)
6104 /* This covers the case where we have optimized the original
6105 function away, and only access the transactional clone. */
6106 if (!src_n
|| !src_n
->definition
)
6111 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
6112 assemble_align (POINTER_SIZE
);
6116 assemble_integer (XEXP (DECL_RTL (src
), 0),
6117 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
6118 assemble_integer (XEXP (DECL_RTL (dst
), 0),
6119 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
6123 /* Provide a default for the tm_clone_table section. */
6126 default_clone_table_section (void)
6128 return get_named_section (NULL
, ".tm_clone_table", 3);
6131 /* Helper comparison function for qsorting by the DECL_UID stored in
6132 alias_pair->emitted_diags. */
6135 tm_alias_pair_cmp (const void *x
, const void *y
)
6137 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
6138 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
6139 if (p1
->uid
< p2
->uid
)
6141 if (p1
->uid
> p2
->uid
)
6147 finish_tm_clone_pairs (void)
6149 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
6151 if (tm_clone_hash
== NULL
)
6154 /* We need a determenistic order for the .tm_clone_table, otherwise
6155 we will get bootstrap comparison failures, so dump the hash table
6156 to a vector, sort it, and dump the vector. */
6158 /* Dump the hashtable to a vector. */
6160 hash_table
<tm_clone_hasher
>::iterator iter
;
6161 FOR_EACH_HASH_TABLE_ELEMENT (*tm_clone_hash
, map
, tree_map
*, iter
)
6163 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
6164 tm_alias_pairs
.safe_push (p
);
6167 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
6170 dump_tm_clone_pairs (tm_alias_pairs
);
6172 tm_clone_hash
->empty ();
6173 tm_clone_hash
= NULL
;
6174 tm_alias_pairs
.release ();
6178 /* Emit an assembler directive to set symbol for DECL visibility to
6179 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
6182 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
6183 int vis ATTRIBUTE_UNUSED
)
6185 #ifdef HAVE_GAS_HIDDEN
6186 static const char * const visibility_types
[] = {
6187 NULL
, "protected", "hidden", "internal"
6190 const char *name
, *type
;
6193 id
= DECL_ASSEMBLER_NAME (decl
);
6194 ultimate_transparent_alias_target (&id
);
6195 name
= IDENTIFIER_POINTER (id
);
6197 type
= visibility_types
[vis
];
6199 fprintf (asm_out_file
, "\t.%s\t", type
);
6200 assemble_name (asm_out_file
, name
);
6201 fprintf (asm_out_file
, "\n");
6203 if (!DECL_ARTIFICIAL (decl
))
6204 warning (OPT_Wattributes
, "visibility attribute not supported "
6205 "in this configuration; ignored");
6209 /* A helper function to call assemble_visibility when needed for a decl. */
6212 maybe_assemble_visibility (tree decl
)
6214 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
6215 if (vis
!= VISIBILITY_DEFAULT
)
6217 targetm
.asm_out
.assemble_visibility (decl
, vis
);
6224 /* Returns 1 if the target configuration supports defining public symbols
6225 so that one of them will be chosen at link time instead of generating a
6226 multiply-defined symbol error, whether through the use of weak symbols or
6227 a target-specific mechanism for having duplicates discarded. */
6230 supports_one_only (void)
6232 if (SUPPORTS_ONE_ONLY
)
6234 return TARGET_SUPPORTS_WEAK
;
6237 /* Set up DECL as a public symbol that can be defined in multiple
6238 translation units without generating a linker error. */
6241 make_decl_one_only (tree decl
, tree comdat_group
)
6243 struct symtab_node
*symbol
;
6244 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
6246 TREE_PUBLIC (decl
) = 1;
6249 symbol
= varpool_node::get_create (decl
);
6251 symbol
= cgraph_node::get_create (decl
);
6253 if (SUPPORTS_ONE_ONLY
)
6255 #ifdef MAKE_DECL_ONE_ONLY
6256 MAKE_DECL_ONE_ONLY (decl
);
6258 symbol
->set_comdat_group (comdat_group
);
6260 else if (VAR_P (decl
)
6261 && (DECL_INITIAL (decl
) == 0
6262 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6263 DECL_COMMON (decl
) = 1;
6266 gcc_assert (TARGET_SUPPORTS_WEAK
);
6267 DECL_WEAK (decl
) = 1;
6272 init_varasm_once (void)
6274 section_htab
= hash_table
<section_hasher
>::create_ggc (31);
6275 object_block_htab
= hash_table
<object_block_hasher
>::create_ggc (31);
6276 const_desc_htab
= hash_table
<tree_descriptor_hasher
>::create_ggc (1009);
6278 shared_constant_pool
= create_constant_pool ();
6280 #ifdef TEXT_SECTION_ASM_OP
6281 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
6282 TEXT_SECTION_ASM_OP
);
6285 #ifdef DATA_SECTION_ASM_OP
6286 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6287 DATA_SECTION_ASM_OP
);
6290 #ifdef SDATA_SECTION_ASM_OP
6291 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6292 SDATA_SECTION_ASM_OP
);
6295 #ifdef READONLY_DATA_SECTION_ASM_OP
6296 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
6297 READONLY_DATA_SECTION_ASM_OP
);
6300 #ifdef CTORS_SECTION_ASM_OP
6301 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
6302 CTORS_SECTION_ASM_OP
);
6305 #ifdef DTORS_SECTION_ASM_OP
6306 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
6307 DTORS_SECTION_ASM_OP
);
6310 #ifdef BSS_SECTION_ASM_OP
6311 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6312 output_section_asm_op
,
6313 BSS_SECTION_ASM_OP
);
6316 #ifdef SBSS_SECTION_ASM_OP
6317 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6318 output_section_asm_op
,
6319 SBSS_SECTION_ASM_OP
);
6322 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6323 | SECTION_COMMON
, emit_tls_common
);
6324 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6325 | SECTION_COMMON
, emit_local
);
6326 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6327 | SECTION_COMMON
, emit_common
);
6329 #if defined ASM_OUTPUT_ALIGNED_BSS
6330 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
6334 targetm
.asm_out
.init_sections ();
6336 if (readonly_data_section
== NULL
)
6337 readonly_data_section
= text_section
;
6339 #ifdef ASM_OUTPUT_EXTERNAL
6340 pending_assemble_externals_set
= new hash_set
<tree
>;
6345 decl_default_tls_model (const_tree decl
)
6347 enum tls_model kind
;
6350 is_local
= targetm
.binds_local_p (decl
);
6354 kind
= TLS_MODEL_LOCAL_EXEC
;
6356 kind
= TLS_MODEL_INITIAL_EXEC
;
6359 /* Local dynamic is inefficient when we're not combining the
6360 parts of the address. */
6361 else if (optimize
&& is_local
)
6362 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
6364 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
6365 if (kind
< flag_tls_default
)
6366 kind
= flag_tls_default
;
6371 /* Select a set of attributes for section NAME based on the properties
6372 of DECL and whether or not RELOC indicates that DECL's initializer
6373 might contain runtime relocations.
6375 We make the section read-only and executable for a function decl,
6376 read-only for a const data decl, and writable for a non-const data decl. */
6379 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6383 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6384 flags
= SECTION_CODE
;
6387 enum section_category category
6388 = categorize_decl_for_section (decl
, reloc
);
6389 if (decl_readonly_section_1 (category
))
6391 else if (category
== SECCAT_DATA_REL_RO
6392 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6393 flags
= SECTION_WRITE
| SECTION_RELRO
;
6395 flags
= SECTION_WRITE
;
6399 flags
= SECTION_WRITE
;
6400 if (strcmp (name
, ".data.rel.ro") == 0
6401 || strcmp (name
, ".data.rel.ro.local") == 0)
6402 flags
|= SECTION_RELRO
;
6405 if (decl
&& DECL_P (decl
) && DECL_COMDAT_GROUP (decl
))
6406 flags
|= SECTION_LINKONCE
;
6408 if (strcmp (name
, ".vtable_map_vars") == 0)
6409 flags
|= SECTION_LINKONCE
;
6411 if (decl
&& VAR_P (decl
) && DECL_THREAD_LOCAL_P (decl
))
6412 flags
|= SECTION_TLS
| SECTION_WRITE
;
6414 if (strcmp (name
, ".bss") == 0
6415 || strncmp (name
, ".bss.", 5) == 0
6416 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6417 || strcmp (name
, ".persistent.bss") == 0
6418 || strcmp (name
, ".sbss") == 0
6419 || strncmp (name
, ".sbss.", 6) == 0
6420 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6421 flags
|= SECTION_BSS
;
6423 if (strcmp (name
, ".tdata") == 0
6424 || strncmp (name
, ".tdata.", 7) == 0
6425 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6426 flags
|= SECTION_TLS
;
6428 if (strcmp (name
, ".tbss") == 0
6429 || strncmp (name
, ".tbss.", 6) == 0
6430 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6431 flags
|= SECTION_TLS
| SECTION_BSS
;
6433 /* Various sections have special ELF types that the assembler will
6434 assign by default based on the name. They are neither SHT_PROGBITS
6435 nor SHT_NOBITS, so when changing sections we don't want to print a
6436 section type (@progbits or @nobits). Rather than duplicating the
6437 assembler's knowledge of what those special name patterns are, just
6438 let the assembler choose the type if we don't know a specific
6439 reason to set it to something other than the default. SHT_PROGBITS
6440 is the default for sections whose name is not specially known to
6441 the assembler, so it does no harm to leave the choice to the
6442 assembler when @progbits is the best thing we know to use. If
6443 someone is silly enough to emit code or TLS variables to one of
6444 these sections, then don't handle them specially.
6446 default_elf_asm_named_section (below) handles the BSS, TLS, ENTSIZE, and
6447 LINKONCE cases when NOTYPE is not set, so leave those to its logic. */
6448 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
| SECTION_ENTSIZE
))
6449 && !(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
)))
6450 flags
|= SECTION_NOTYPE
;
6455 /* Return true if the target supports some form of global BSS,
6456 either through bss_noswitch_section, or by selecting a BSS
6457 section in TARGET_ASM_SELECT_SECTION. */
6460 have_global_bss_p (void)
6462 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6465 /* Output assembly to switch to section NAME with attribute FLAGS.
6466 Four variants for common object file formats. */
6469 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6470 unsigned int flags ATTRIBUTE_UNUSED
,
6471 tree decl ATTRIBUTE_UNUSED
)
6473 /* Some object formats don't support named sections at all. The
6474 front-end should already have flagged this as an error. */
6478 #ifndef TLS_SECTION_ASM_FLAG
6479 #define TLS_SECTION_ASM_FLAG 'T'
6483 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6486 char flagchars
[11], *f
= flagchars
;
6487 unsigned int numeric_value
= 0;
6489 /* If we have already declared this section, we can use an
6490 abbreviated form to switch back to it -- unless this section is
6491 part of a COMDAT groups, in which case GAS requires the full
6492 declaration every time. */
6493 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6494 && (flags
& SECTION_DECLARED
))
6496 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6500 /* If we have a machine specific flag, then use the numeric value to pass
6502 if (targetm
.asm_out
.elf_flags_numeric (flags
, &numeric_value
))
6503 snprintf (f
, sizeof (flagchars
), "0x%08x", numeric_value
);
6506 if (!(flags
& SECTION_DEBUG
))
6508 #if HAVE_GAS_SECTION_EXCLUDE
6509 if (flags
& SECTION_EXCLUDE
)
6512 if (flags
& SECTION_WRITE
)
6514 if (flags
& SECTION_CODE
)
6516 if (flags
& SECTION_SMALL
)
6518 if (flags
& SECTION_MERGE
)
6520 if (flags
& SECTION_STRINGS
)
6522 if (flags
& SECTION_TLS
)
6523 *f
++ = TLS_SECTION_ASM_FLAG
;
6524 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6526 #ifdef MACH_DEP_SECTION_ASM_FLAG
6527 if (flags
& SECTION_MACH_DEP
)
6528 *f
++ = MACH_DEP_SECTION_ASM_FLAG
;
6533 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6535 /* default_section_type_flags (above) knows which flags need special
6536 handling here, and sets NOTYPE when none of these apply so that the
6537 assembler's logic for default types can apply to user-chosen
6539 if (!(flags
& SECTION_NOTYPE
))
6544 if (flags
& SECTION_BSS
)
6550 /* On platforms that use "@" as the assembly comment character,
6552 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6554 fprintf (asm_out_file
, format
, type
);
6556 if (flags
& SECTION_ENTSIZE
)
6557 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6558 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6560 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6561 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6563 fprintf (asm_out_file
, ",%s,comdat",
6564 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6568 putc ('\n', asm_out_file
);
6572 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6573 tree decl ATTRIBUTE_UNUSED
)
6575 char flagchars
[8], *f
= flagchars
;
6577 if (flags
& SECTION_WRITE
)
6579 if (flags
& SECTION_CODE
)
6583 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6587 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6590 default_coff_asm_named_section (name
, flags
, decl
);
6592 if (flags
& SECTION_LINKONCE
)
6594 /* Functions may have been compiled at various levels of
6595 optimization so we can't use `same_size' here.
6596 Instead, have the linker pick one. */
6597 fprintf (asm_out_file
, "\t.linkonce %s\n",
6598 (flags
& SECTION_CODE
? "discard" : "same_size"));
6602 /* The lame default section selector. */
6605 default_select_section (tree decl
, int reloc
,
6606 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6610 if (decl_readonly_section (decl
, reloc
))
6611 return readonly_data_section
;
6613 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6615 if (! ((flag_pic
&& reloc
)
6616 || !TREE_READONLY (decl
)
6617 || TREE_SIDE_EFFECTS (decl
)
6618 || !TREE_CONSTANT (decl
)))
6619 return readonly_data_section
;
6621 else if (TREE_CODE (decl
) == STRING_CST
)
6622 return readonly_data_section
;
6623 else if (! (flag_pic
&& reloc
))
6624 return readonly_data_section
;
6626 return data_section
;
6629 enum section_category
6630 categorize_decl_for_section (const_tree decl
, int reloc
)
6632 enum section_category ret
;
6634 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6636 else if (TREE_CODE (decl
) == STRING_CST
)
6638 if ((flag_sanitize
& SANITIZE_ADDRESS
)
6639 && asan_protect_global (CONST_CAST_TREE (decl
)))
6640 /* or !flag_merge_constants */
6641 return SECCAT_RODATA
;
6643 return SECCAT_RODATA_MERGE_STR
;
6645 else if (VAR_P (decl
))
6647 tree d
= CONST_CAST_TREE (decl
);
6648 if (bss_initializer_p (decl
))
6650 else if (! TREE_READONLY (decl
)
6651 || TREE_SIDE_EFFECTS (decl
)
6652 || (DECL_INITIAL (decl
)
6653 && ! TREE_CONSTANT (DECL_INITIAL (decl
))))
6655 /* Here the reloc_rw_mask is not testing whether the section should
6656 be read-only or not, but whether the dynamic link will have to
6657 do something. If so, we wish to segregate the data in order to
6658 minimize cache misses inside the dynamic linker. */
6659 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6660 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6664 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6665 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6666 else if (reloc
|| flag_merge_constants
< 2
6667 || ((flag_sanitize
& SANITIZE_ADDRESS
)
6668 /* PR 81697: for architectures that use section anchors we
6669 need to ignore DECL_RTL_SET_P (decl) for string constants
6670 inside this asan_protect_global call because otherwise
6671 we'll wrongly put them into SECCAT_RODATA_MERGE_CONST
6672 section, set DECL_RTL (decl) later on and add DECL to
6673 protected globals via successive asan_protect_global
6674 calls. In this scenario we'll end up with wrong
6675 alignment of these strings at runtime and possible ASan
6677 && asan_protect_global (d
, use_object_blocks_p ()
6678 && use_blocks_for_decl_p (d
))))
6679 /* C and C++ don't allow different variables to share the same
6680 location. -fmerge-all-constants allows even that (at the
6681 expense of not conforming). */
6682 ret
= SECCAT_RODATA
;
6683 else if (DECL_INITIAL (decl
)
6684 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6685 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6687 ret
= SECCAT_RODATA_MERGE_CONST
;
6689 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6691 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6692 || TREE_SIDE_EFFECTS (decl
)
6693 || ! TREE_CONSTANT (decl
))
6696 ret
= SECCAT_RODATA
;
6699 ret
= SECCAT_RODATA
;
6701 /* There are no read-only thread-local sections. */
6702 if (VAR_P (decl
) && DECL_THREAD_LOCAL_P (decl
))
6704 /* Note that this would be *just* SECCAT_BSS, except that there's
6705 no concept of a read-only thread-local-data section. */
6706 if (ret
== SECCAT_BSS
6707 || DECL_INITIAL (decl
) == NULL
6708 || (flag_zero_initialized_in_bss
6709 && initializer_zerop (DECL_INITIAL (decl
))))
6715 /* If the target uses small data sections, select it. */
6716 else if (targetm
.in_small_data_p (decl
))
6718 if (ret
== SECCAT_BSS
)
6720 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6721 ret
= SECCAT_SRODATA
;
6730 decl_readonly_section_1 (enum section_category category
)
6735 case SECCAT_RODATA_MERGE_STR
:
6736 case SECCAT_RODATA_MERGE_STR_INIT
:
6737 case SECCAT_RODATA_MERGE_CONST
:
6738 case SECCAT_SRODATA
:
6746 decl_readonly_section (const_tree decl
, int reloc
)
6748 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6751 /* Select a section based on the above categorization. */
6754 default_elf_select_section (tree decl
, int reloc
,
6755 unsigned HOST_WIDE_INT align
)
6758 switch (categorize_decl_for_section (decl
, reloc
))
6761 /* We're not supposed to be called on FUNCTION_DECLs. */
6764 return readonly_data_section
;
6765 case SECCAT_RODATA_MERGE_STR
:
6766 return mergeable_string_section (decl
, align
, 0);
6767 case SECCAT_RODATA_MERGE_STR_INIT
:
6768 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6769 case SECCAT_RODATA_MERGE_CONST
:
6770 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6771 case SECCAT_SRODATA
:
6775 return data_section
;
6776 case SECCAT_DATA_REL
:
6777 sname
= ".data.rel";
6779 case SECCAT_DATA_REL_LOCAL
:
6780 sname
= ".data.rel.local";
6782 case SECCAT_DATA_REL_RO
:
6783 sname
= ".data.rel.ro";
6785 case SECCAT_DATA_REL_RO_LOCAL
:
6786 sname
= ".data.rel.ro.local";
6809 return get_named_section (decl
, sname
, reloc
);
6812 /* Construct a unique section name based on the decl name and the
6813 categorization performed above. */
6816 default_unique_section (tree decl
, int reloc
)
6818 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6819 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6820 const char *prefix
, *name
, *linkonce
;
6824 switch (categorize_decl_for_section (decl
, reloc
))
6827 prefix
= one_only
? ".t" : ".text";
6830 case SECCAT_RODATA_MERGE_STR
:
6831 case SECCAT_RODATA_MERGE_STR_INIT
:
6832 case SECCAT_RODATA_MERGE_CONST
:
6833 prefix
= one_only
? ".r" : ".rodata";
6835 case SECCAT_SRODATA
:
6836 prefix
= one_only
? ".s2" : ".sdata2";
6839 prefix
= one_only
? ".d" : ".data";
6841 case SECCAT_DATA_REL
:
6842 prefix
= one_only
? ".d.rel" : ".data.rel";
6844 case SECCAT_DATA_REL_LOCAL
:
6845 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6847 case SECCAT_DATA_REL_RO
:
6848 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6850 case SECCAT_DATA_REL_RO_LOCAL
:
6851 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6854 prefix
= one_only
? ".s" : ".sdata";
6857 prefix
= one_only
? ".b" : ".bss";
6860 prefix
= one_only
? ".sb" : ".sbss";
6863 prefix
= one_only
? ".td" : ".tdata";
6866 prefix
= one_only
? ".tb" : ".tbss";
6872 id
= DECL_ASSEMBLER_NAME (decl
);
6873 ultimate_transparent_alias_target (&id
);
6874 name
= IDENTIFIER_POINTER (id
);
6875 name
= targetm
.strip_name_encoding (name
);
6877 /* If we're using one_only, then there needs to be a .gnu.linkonce
6878 prefix to the section name. */
6879 linkonce
= one_only
? ".gnu.linkonce" : "";
6881 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6883 set_decl_section_name (decl
, string
);
6886 /* Subroutine of compute_reloc_for_rtx for leaf rtxes. */
6889 compute_reloc_for_rtx_1 (const_rtx x
)
6891 switch (GET_CODE (x
))
6894 return SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6902 /* Like compute_reloc_for_constant, except for an RTX. The return value
6903 is a mask for which bit 1 indicates a global relocation, and bit 0
6904 indicates a local relocation. */
6907 compute_reloc_for_rtx (const_rtx x
)
6909 switch (GET_CODE (x
))
6913 return compute_reloc_for_rtx_1 (x
);
6918 subrtx_iterator::array_type array
;
6919 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
6920 reloc
|= compute_reloc_for_rtx_1 (*iter
);
6930 default_select_rtx_section (machine_mode mode ATTRIBUTE_UNUSED
,
6932 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6934 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6935 return data_section
;
6937 return readonly_data_section
;
6941 default_elf_select_rtx_section (machine_mode mode
, rtx x
,
6942 unsigned HOST_WIDE_INT align
)
6944 int reloc
= compute_reloc_for_rtx (x
);
6946 /* ??? Handle small data here somehow. */
6948 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6951 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6953 return get_named_section (NULL
, ".data.rel.ro", 3);
6956 return mergeable_constant_section (mode
, align
, 0);
6959 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6962 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6967 /* Careful not to prod global register variables. */
6970 symbol
= XEXP (rtl
, 0);
6971 if (GET_CODE (symbol
) != SYMBOL_REF
)
6974 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6975 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6976 flags
|= SYMBOL_FLAG_FUNCTION
;
6977 if (targetm
.binds_local_p (decl
))
6978 flags
|= SYMBOL_FLAG_LOCAL
;
6979 if (VAR_P (decl
) && DECL_THREAD_LOCAL_P (decl
))
6980 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6981 else if (targetm
.in_small_data_p (decl
))
6982 flags
|= SYMBOL_FLAG_SMALL
;
6983 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6984 being PUBLIC, the thing *must* be defined in this translation unit.
6985 Prevent this buglet from being propagated into rtl code as well. */
6986 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6987 flags
|= SYMBOL_FLAG_EXTERNAL
;
6989 SYMBOL_REF_FLAGS (symbol
) = flags
;
6992 /* By default, we do nothing for encode_section_info, so we need not
6993 do anything but discard the '*' marker. */
6996 default_strip_name_encoding (const char *str
)
6998 return str
+ (*str
== '*');
7001 #ifdef ASM_OUTPUT_DEF
7002 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
7003 anchor relative to ".", the current section position. */
7006 default_asm_output_anchor (rtx symbol
)
7010 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
7011 SYMBOL_REF_BLOCK_OFFSET (symbol
));
7012 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
7016 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
7019 default_use_anchors_for_symbol_p (const_rtx symbol
)
7022 section
*sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
7024 /* This function should only be called with non-zero SYMBOL_REF_BLOCK,
7025 furthermore get_block_for_section should not create object blocks
7026 for mergeable sections. */
7027 gcc_checking_assert (sect
&& !(sect
->common
.flags
& SECTION_MERGE
));
7029 /* Don't use anchors for small data sections. The small data register
7030 acts as an anchor for such sections. */
7031 if (sect
->common
.flags
& SECTION_SMALL
)
7034 decl
= SYMBOL_REF_DECL (symbol
);
7035 if (decl
&& DECL_P (decl
))
7037 /* Don't use section anchors for decls that might be defined or
7038 usurped by other modules. */
7039 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
7042 /* Don't use section anchors for decls that will be placed in a
7043 small data section. */
7044 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
7045 one above. The problem is that we only use SECTION_SMALL for
7046 sections that should be marked as small in the section directive. */
7047 if (targetm
.in_small_data_p (decl
))
7050 /* Don't use section anchors for decls that won't fit inside a single
7051 anchor range to reduce the amount of instructions required to refer
7052 to the entire declaration. */
7053 if (DECL_SIZE_UNIT (decl
) == NULL_TREE
7054 || !tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
))
7055 || (tree_to_uhwi (DECL_SIZE_UNIT (decl
))
7056 >= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
))
7063 /* Return true when RESOLUTION indicate that symbol will be bound to the
7064 definition provided by current .o file. */
7067 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
7069 return (resolution
== LDPR_PREVAILING_DEF
7070 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
7071 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
7074 /* Return true when RESOLUTION indicate that symbol will be bound locally
7075 within current executable or DSO. */
7078 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
7080 return (resolution
== LDPR_PREVAILING_DEF
7081 || resolution
== LDPR_PREVAILING_DEF_IRONLY
7082 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
7083 || resolution
== LDPR_PREEMPTED_REG
7084 || resolution
== LDPR_PREEMPTED_IR
7085 || resolution
== LDPR_RESOLVED_IR
7086 || resolution
== LDPR_RESOLVED_EXEC
);
7089 /* COMMON_LOCAL_P is true means that the linker can guarantee that an
7090 uninitialized common symbol in the executable will still be defined
7091 (through COPY relocation) in the executable. */
7094 default_binds_local_p_3 (const_tree exp
, bool shlib
, bool weak_dominate
,
7095 bool extern_protected_data
, bool common_local_p
)
7097 /* A non-decl is an entry in the constant pool. */
7101 /* Weakrefs may not bind locally, even though the weakref itself is always
7102 static and therefore local. Similarly, the resolver for ifunc functions
7103 might resolve to a non-local function.
7104 FIXME: We can resolve the weakref case more curefuly by looking at the
7106 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
7107 || (TREE_CODE (exp
) == FUNCTION_DECL
7108 && cgraph_node::get (exp
)
7109 && cgraph_node::get (exp
)->ifunc_resolver
))
7112 /* Static variables are always local. */
7113 if (! TREE_PUBLIC (exp
))
7116 /* With resolution file in hand, take look into resolutions.
7117 We can't just return true for resolved_locally symbols,
7118 because dynamic linking might overwrite symbols
7119 in shared libraries. */
7120 bool resolved_locally
= false;
7122 bool uninited_common
= (DECL_COMMON (exp
)
7123 && (DECL_INITIAL (exp
) == NULL
7125 && DECL_INITIAL (exp
) == error_mark_node
)));
7127 /* A non-external variable is defined locally only if it isn't
7128 uninitialized COMMON variable or common_local_p is true. */
7129 bool defined_locally
= (!DECL_EXTERNAL (exp
)
7130 && (!uninited_common
|| common_local_p
));
7131 if (symtab_node
*node
= symtab_node::get (exp
))
7133 if (node
->in_other_partition
)
7134 defined_locally
= true;
7135 if (node
->can_be_discarded_p ())
7137 else if (resolution_to_local_definition_p (node
->resolution
))
7138 defined_locally
= resolved_locally
= true;
7139 else if (resolution_local_p (node
->resolution
))
7140 resolved_locally
= true;
7142 if (defined_locally
&& weak_dominate
&& !shlib
)
7143 resolved_locally
= true;
7145 /* Undefined weak symbols are never defined locally. */
7146 if (DECL_WEAK (exp
) && !defined_locally
)
7149 /* A symbol is local if the user has said explicitly that it will be,
7150 or if we have a definition for the symbol. We cannot infer visibility
7151 for undefined symbols. */
7152 if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
7153 && (TREE_CODE (exp
) == FUNCTION_DECL
7154 || !extern_protected_data
7155 || DECL_VISIBILITY (exp
) != VISIBILITY_PROTECTED
)
7156 && (DECL_VISIBILITY_SPECIFIED (exp
) || defined_locally
))
7159 /* If PIC, then assume that any global name can be overridden by
7160 symbols resolved from other modules. */
7164 /* Variables defined outside this object might not be local. */
7165 if (DECL_EXTERNAL (exp
) && !resolved_locally
)
7168 /* Non-dominant weak symbols are not defined locally. */
7169 if (DECL_WEAK (exp
) && !resolved_locally
)
7172 /* Uninitialized COMMON variable may be unified with symbols
7173 resolved from other modules. */
7174 if (uninited_common
&& !resolved_locally
)
7177 /* Otherwise we're left with initialized (or non-common) global data
7178 which is of necessity defined locally. */
7182 /* Assume ELF-ish defaults, since that's pretty much the most liberal
7183 wrt cross-module name binding. */
7186 default_binds_local_p (const_tree exp
)
7188 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, false, false);
7191 /* Similar to default_binds_local_p, but common symbol may be local and
7192 extern protected data is non-local. */
7195 default_binds_local_p_2 (const_tree exp
)
7197 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, true,
7202 default_binds_local_p_1 (const_tree exp
, int shlib
)
7204 return default_binds_local_p_3 (exp
, shlib
!= 0, false, false, false);
7207 /* Return true when references to DECL must bind to current definition in
7210 The condition is usually equivalent to whether the function binds to the
7211 current module (shared library or executable), that is to binds_local_p.
7212 We use this fact to avoid need for another target hook and implement
7213 the logic using binds_local_p and just special cases where
7214 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
7215 the weak definitions (that can be overwritten at linktime by other
7216 definition from different object file) and when resolution info is available
7217 we simply use the knowledge passed to us by linker plugin. */
7219 decl_binds_to_current_def_p (const_tree decl
)
7221 gcc_assert (DECL_P (decl
));
7222 if (!targetm
.binds_local_p (decl
))
7224 if (!TREE_PUBLIC (decl
))
7227 /* When resolution is available, just use it. */
7228 if (symtab_node
*node
= symtab_node::get (decl
))
7230 if (node
->resolution
!= LDPR_UNKNOWN
7231 && !node
->can_be_discarded_p ())
7232 return resolution_to_local_definition_p (node
->resolution
);
7235 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
7236 binds locally but still can be overwritten), DECL_COMMON (can be merged
7237 with a non-common definition somewhere in the same module) or
7239 This rely on fact that binds_local_p behave as decl_replaceable_p
7240 for all other declaration types. */
7241 if (DECL_WEAK (decl
))
7243 if (DECL_COMMON (decl
)
7244 && (DECL_INITIAL (decl
) == NULL
7245 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
7247 if (DECL_EXTERNAL (decl
))
7252 /* A replaceable function or variable is one which may be replaced
7253 at link-time with an entirely different definition, provided that the
7254 replacement has the same type. For example, functions declared
7255 with __attribute__((weak)) on most systems are replaceable.
7257 COMDAT functions are not replaceable, since all definitions of the
7258 function must be equivalent. It is important that COMDAT functions
7259 not be treated as replaceable so that use of C++ template
7260 instantiations is not penalized. */
7263 decl_replaceable_p (tree decl
)
7265 gcc_assert (DECL_P (decl
));
7266 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
7268 if (!flag_semantic_interposition
7269 && !DECL_WEAK (decl
))
7271 return !decl_binds_to_current_def_p (decl
);
7274 /* Default function to output code that will globalize a label. A
7275 target must define GLOBAL_ASM_OP or provide its own function to
7276 globalize a label. */
7277 #ifdef GLOBAL_ASM_OP
7279 default_globalize_label (FILE * stream
, const char *name
)
7281 fputs (GLOBAL_ASM_OP
, stream
);
7282 assemble_name (stream
, name
);
7283 putc ('\n', stream
);
7285 #endif /* GLOBAL_ASM_OP */
7287 /* Default function to output code that will globalize a declaration. */
7289 default_globalize_decl_name (FILE * stream
, tree decl
)
7291 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
7292 targetm
.asm_out
.globalize_label (stream
, name
);
7295 /* Default function to output a label for unwind information. The
7296 default is to do nothing. A target that needs nonlocal labels for
7297 unwind information must provide its own function to do this. */
7299 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
7300 tree decl ATTRIBUTE_UNUSED
,
7301 int for_eh ATTRIBUTE_UNUSED
,
7302 int empty ATTRIBUTE_UNUSED
)
7306 /* Default function to output a label to divide up the exception table.
7307 The default is to do nothing. A target that needs/wants to divide
7308 up the table must provide it's own function to do this. */
7310 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
7314 /* This is how to output an internal numbered label where PREFIX is
7315 the class of label and LABELNO is the number within the class. */
7318 default_generate_internal_label (char *buf
, const char *prefix
,
7319 unsigned long labelno
)
7321 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7324 /* This is how to output an internal numbered label where PREFIX is
7325 the class of label and LABELNO is the number within the class. */
7328 default_internal_label (FILE *stream
, const char *prefix
,
7329 unsigned long labelno
)
7331 char *const buf
= (char *) alloca (40 + strlen (prefix
));
7332 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7333 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
7337 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
7340 default_asm_declare_constant_name (FILE *file
, const char *name
,
7341 const_tree exp ATTRIBUTE_UNUSED
,
7342 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
7344 assemble_label (file
, name
);
7347 /* This is the default behavior at the beginning of a file. It's
7348 controlled by two other target-hook toggles. */
7350 default_file_start (void)
7352 if (targetm
.asm_file_start_app_off
7353 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
7354 fputs (ASM_APP_OFF
, asm_out_file
);
7356 if (targetm
.asm_file_start_file_directive
)
7358 /* LTO produced units have no meaningful main_input_filename. */
7360 output_file_directive (asm_out_file
, "<artificial>");
7362 output_file_directive (asm_out_file
, main_input_filename
);
7366 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
7367 which emits a special section directive used to indicate whether or
7368 not this object file needs an executable stack. This is primarily
7369 a GNU extension to ELF but could be used on other targets. */
7371 int trampolines_created
;
7374 file_end_indicate_exec_stack (void)
7376 unsigned int flags
= SECTION_DEBUG
;
7377 if (trampolines_created
)
7378 flags
|= SECTION_CODE
;
7380 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
7383 /* Emit a special section directive to indicate that this object file
7384 was compiled with -fsplit-stack. This is used to let the linker
7385 detect calls between split-stack code and non-split-stack code, so
7386 that it can modify the split-stack code to allocate a sufficiently
7387 large stack. We emit another special section if there are any
7388 functions in this file which have the no_split_stack attribute, to
7389 prevent the linker from warning about being unable to convert the
7390 functions if they call non-split-stack code. */
7393 file_end_indicate_split_stack (void)
7395 if (flag_split_stack
)
7397 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
7399 if (saw_no_split_stack
)
7400 switch_to_section (get_section (".note.GNU-no-split-stack",
7401 SECTION_DEBUG
, NULL
));
7405 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
7406 a get_unnamed_section callback. */
7409 output_section_asm_op (const void *directive
)
7411 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
7414 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
7415 the current section is NEW_SECTION. */
7418 switch_to_section (section
*new_section
)
7420 if (in_section
== new_section
)
7423 if (new_section
->common
.flags
& SECTION_FORGET
)
7426 in_section
= new_section
;
7428 switch (SECTION_STYLE (new_section
))
7431 targetm
.asm_out
.named_section (new_section
->named
.name
,
7432 new_section
->named
.common
.flags
,
7433 new_section
->named
.decl
);
7436 case SECTION_UNNAMED
:
7437 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
7440 case SECTION_NOSWITCH
:
7445 new_section
->common
.flags
|= SECTION_DECLARED
;
7448 /* If block symbol SYMBOL has not yet been assigned an offset, place
7449 it at the end of its block. */
7452 place_block_symbol (rtx symbol
)
7454 unsigned HOST_WIDE_INT size
, mask
, offset
;
7455 struct constant_descriptor_rtx
*desc
;
7456 unsigned int alignment
;
7457 struct object_block
*block
;
7460 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7461 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7464 /* Work out the symbol's size and alignment. */
7465 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7467 desc
= SYMBOL_REF_CONSTANT (symbol
);
7468 alignment
= desc
->align
;
7469 size
= GET_MODE_SIZE (desc
->mode
);
7471 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7473 decl
= SYMBOL_REF_DECL (symbol
);
7474 gcc_checking_assert (DECL_IN_CONSTANT_POOL (decl
));
7475 alignment
= DECL_ALIGN (decl
);
7476 size
= get_constant_size (DECL_INITIAL (decl
));
7477 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7478 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7479 && asan_protect_global (DECL_INITIAL (decl
)))
7481 size
+= asan_red_zone_size (size
);
7482 alignment
= MAX (alignment
,
7483 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7488 struct symtab_node
*snode
;
7489 decl
= SYMBOL_REF_DECL (symbol
);
7491 snode
= symtab_node::get (decl
);
7494 rtx target
= DECL_RTL (snode
->ultimate_alias_target ()->decl
);
7496 gcc_assert (MEM_P (target
)
7497 && GET_CODE (XEXP (target
, 0)) == SYMBOL_REF
7498 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (target
, 0)));
7499 target
= XEXP (target
, 0);
7500 place_block_symbol (target
);
7501 SYMBOL_REF_BLOCK_OFFSET (symbol
) = SYMBOL_REF_BLOCK_OFFSET (target
);
7504 alignment
= get_variable_align (decl
);
7505 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7506 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7507 && asan_protect_global (decl
))
7509 size
+= asan_red_zone_size (size
);
7510 alignment
= MAX (alignment
,
7511 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7515 /* Calculate the object's offset from the start of the block. */
7516 block
= SYMBOL_REF_BLOCK (symbol
);
7517 mask
= alignment
/ BITS_PER_UNIT
- 1;
7518 offset
= (block
->size
+ mask
) & ~mask
;
7519 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7521 /* Record the block's new alignment and size. */
7522 block
->alignment
= MAX (block
->alignment
, alignment
);
7523 block
->size
= offset
+ size
;
7525 vec_safe_push (block
->objects
, symbol
);
7528 /* Return the anchor that should be used to address byte offset OFFSET
7529 from the first object in BLOCK. MODEL is the TLS model used
7533 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7534 enum tls_model model
)
7537 unsigned int begin
, middle
, end
;
7538 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7541 /* Work out the anchor's offset. Use an offset of 0 for the first
7542 anchor so that we don't pessimize the case where we take the address
7543 of a variable at the beginning of the block. This is particularly
7544 useful when a block has only one variable assigned to it.
7546 We try to place anchors RANGE bytes apart, so there can then be
7547 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7548 a ptr_mode offset. With some target settings, the lowest such
7549 anchor might be out of range for the lowest ptr_mode offset;
7550 likewise the highest anchor for the highest offset. Use anchors
7551 at the extreme ends of the ptr_mode range in such cases.
7553 All arithmetic uses unsigned integers in order to avoid
7555 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7556 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7557 range
= max_offset
- min_offset
+ 1;
7562 bias
= HOST_WIDE_INT_1U
<< (GET_MODE_BITSIZE (ptr_mode
) - 1);
7565 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7566 delta
-= delta
% range
;
7569 offset
= (HOST_WIDE_INT
) (-delta
);
7573 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7574 delta
-= delta
% range
;
7575 if (delta
> bias
- 1)
7577 offset
= (HOST_WIDE_INT
) delta
;
7581 /* Do a binary search to see if there's already an anchor we can use.
7582 Set BEGIN to the new anchor's index if not. */
7584 end
= vec_safe_length (block
->anchors
);
7585 while (begin
!= end
)
7587 middle
= (end
+ begin
) / 2;
7588 anchor
= (*block
->anchors
)[middle
];
7589 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7591 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7593 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7595 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7601 /* Create a new anchor with a unique label. */
7602 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7603 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7604 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7605 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7607 /* Insert it at index BEGIN. */
7608 vec_safe_insert (block
->anchors
, begin
, anchor
);
7612 /* Output the objects in BLOCK. */
7615 output_object_block (struct object_block
*block
)
7617 struct constant_descriptor_rtx
*desc
;
7619 HOST_WIDE_INT offset
;
7623 if (!block
->objects
)
7626 /* Switch to the section and make sure that the first byte is
7627 suitably aligned. */
7628 /* Special case VTV comdat sections similar to assemble_variable. */
7629 if (SECTION_STYLE (block
->sect
) == SECTION_NAMED
7630 && block
->sect
->named
.name
7631 && (strcmp (block
->sect
->named
.name
, ".vtable_map_vars") == 0))
7632 handle_vtv_comdat_section (block
->sect
, block
->sect
->named
.decl
);
7634 switch_to_section (block
->sect
);
7636 gcc_checking_assert (!(block
->sect
->common
.flags
& SECTION_MERGE
));
7637 assemble_align (block
->alignment
);
7639 /* Define the values of all anchors relative to the current section
7641 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7642 targetm
.asm_out
.output_anchor (symbol
);
7644 /* Output the objects themselves. */
7646 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7648 /* Move to the object's offset, padding with zeros if necessary. */
7649 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7650 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7651 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7653 desc
= SYMBOL_REF_CONSTANT (symbol
);
7654 /* Pass 1 for align as we have already laid out everything in the block.
7655 So aligning shouldn't be necessary. */
7656 output_constant_pool_1 (desc
, 1);
7657 offset
+= GET_MODE_SIZE (desc
->mode
);
7659 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7662 decl
= SYMBOL_REF_DECL (symbol
);
7663 assemble_constant_contents (DECL_INITIAL (decl
), XSTR (symbol
, 0),
7664 DECL_ALIGN (decl
), false);
7666 size
= get_constant_size (DECL_INITIAL (decl
));
7668 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7669 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7670 && asan_protect_global (DECL_INITIAL (decl
)))
7672 size
= asan_red_zone_size (size
);
7673 assemble_zeros (size
);
7680 decl
= SYMBOL_REF_DECL (symbol
);
7681 assemble_variable_contents (decl
, XSTR (symbol
, 0), false, false);
7682 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7684 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7685 && asan_protect_global (decl
))
7687 size
= asan_red_zone_size (size
);
7688 assemble_zeros (size
);
7695 /* A callback for qsort to compare object_blocks. */
7698 output_object_block_compare (const void *x
, const void *y
)
7700 object_block
*p1
= *(object_block
* const*)x
;
7701 object_block
*p2
= *(object_block
* const*)y
;
7703 if (p1
->sect
->common
.flags
& SECTION_NAMED
7704 && !(p2
->sect
->common
.flags
& SECTION_NAMED
))
7707 if (!(p1
->sect
->common
.flags
& SECTION_NAMED
)
7708 && p2
->sect
->common
.flags
& SECTION_NAMED
)
7711 if (p1
->sect
->common
.flags
& SECTION_NAMED
7712 && p2
->sect
->common
.flags
& SECTION_NAMED
)
7713 return strcmp (p1
->sect
->named
.name
, p2
->sect
->named
.name
);
7715 unsigned f1
= p1
->sect
->common
.flags
;
7716 unsigned f2
= p2
->sect
->common
.flags
;
7719 return f1
< f2
? -1 : 1;
7722 /* Output the definitions of all object_blocks. */
7725 output_object_blocks (void)
7727 vec
<object_block
*, va_heap
> v
;
7728 v
.create (object_block_htab
->elements ());
7730 hash_table
<object_block_hasher
>::iterator hi
;
7732 FOR_EACH_HASH_TABLE_ELEMENT (*object_block_htab
, obj
, object_block
*, hi
)
7735 /* Sort them in order to output them in a deterministic manner,
7736 otherwise we may get .rodata sections in different orders with
7738 v
.qsort (output_object_block_compare
);
7740 FOR_EACH_VEC_ELT (v
, i
, obj
)
7741 output_object_block (obj
);
7746 /* This function provides a possible implementation of the
7747 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7748 by -frecord-gcc-switches it creates a new mergeable, string section in the
7749 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7750 contains the switches in ASCII format.
7752 FIXME: This code does not correctly handle double quote characters
7753 that appear inside strings, (it strips them rather than preserving them).
7754 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7755 characters - instead it treats them as sub-string separators. Since
7756 we want to emit NUL strings terminators into the object file we have to use
7760 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7764 case SWITCH_TYPE_PASSED
:
7765 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7766 ASM_OUTPUT_SKIP (asm_out_file
, HOST_WIDE_INT_1U
);
7769 case SWITCH_TYPE_DESCRIPTIVE
:
7772 /* Distinguish between invocations where name is NULL. */
7773 static bool started
= false;
7779 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7783 | (SECTION_ENTSIZE
& 1),
7785 switch_to_section (sec
);
7794 /* The return value is currently ignored by the caller, but must be 0.
7795 For -fverbose-asm the return value would be the number of characters
7796 emitted into the assembler file. */
7800 /* Emit text to declare externally defined symbols. It is needed to
7801 properly support non-default visibility. */
7803 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7805 const char *name ATTRIBUTE_UNUSED
)
7807 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7808 set in order to avoid putting out names that are never really
7809 used. Always output visibility specified in the source. */
7810 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7811 && (DECL_VISIBILITY_SPECIFIED (decl
)
7812 || targetm
.binds_local_p (decl
)))
7813 maybe_assemble_visibility (decl
);
7816 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7819 default_asm_output_source_filename (FILE *file
, const char *name
)
7821 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7822 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7824 fprintf (file
, "\t.file\t");
7825 output_quoted_string (file
, name
);
7830 /* Output a file name in the form wanted by System V. */
7833 output_file_directive (FILE *asm_file
, const char *input_name
)
7838 if (input_name
== NULL
)
7839 input_name
= "<stdin>";
7841 input_name
= remap_debug_filename (input_name
);
7843 len
= strlen (input_name
);
7844 na
= input_name
+ len
;
7846 /* NA gets INPUT_NAME sans directory names. */
7847 while (na
> input_name
)
7849 if (IS_DIR_SEPARATOR (na
[-1]))
7854 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7857 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7860 make_debug_expr_from_rtl (const_rtx exp
)
7862 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7863 machine_mode mode
= GET_MODE (exp
);
7866 DECL_ARTIFICIAL (ddecl
) = 1;
7867 if (REG_P (exp
) && REG_EXPR (exp
))
7868 type
= TREE_TYPE (REG_EXPR (exp
));
7869 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7870 type
= TREE_TYPE (MEM_EXPR (exp
));
7873 if (type
&& TYPE_MODE (type
) == mode
)
7874 TREE_TYPE (ddecl
) = type
;
7876 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7877 SET_DECL_MODE (ddecl
, mode
);
7878 dval
= gen_rtx_DEBUG_EXPR (mode
);
7879 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7880 SET_DECL_RTL (ddecl
, dval
);
7884 #ifdef ELF_ASCII_ESCAPES
7885 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7888 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7893 fputs (STRING_ASM_OP
, f
);
7898 escape
= ELF_ASCII_ESCAPES
[c
];
7906 putc ('0'+((c
>>6)&7), f
);
7907 putc ('0'+((c
>>3)&7), f
);
7908 putc ('0'+(c
&7), f
);
7921 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7924 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7926 const char *limit
= s
+ len
;
7927 const char *last_null
= NULL
;
7928 unsigned bytes_in_chunk
= 0;
7932 for (; s
< limit
; s
++)
7936 if (bytes_in_chunk
>= 60)
7945 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7952 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7954 if (bytes_in_chunk
> 0)
7961 default_elf_asm_output_limited_string (f
, s
);
7966 if (bytes_in_chunk
== 0)
7967 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7970 escape
= ELF_ASCII_ESCAPES
[c
];
7979 putc ('0'+((c
>>6)&7), f
);
7980 putc ('0'+((c
>>3)&7), f
);
7981 putc ('0'+(c
&7), f
);
7982 bytes_in_chunk
+= 4;
7987 bytes_in_chunk
+= 2;
7994 if (bytes_in_chunk
> 0)
8002 static GTY(()) section
*elf_init_array_section
;
8003 static GTY(()) section
*elf_fini_array_section
;
8006 get_elf_initfini_array_priority_section (int priority
,
8010 if (priority
!= DEFAULT_INIT_PRIORITY
)
8013 sprintf (buf
, "%s.%.5u",
8014 constructor_p
? ".init_array" : ".fini_array",
8016 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
8022 if (elf_init_array_section
== NULL
)
8023 elf_init_array_section
8024 = get_section (".init_array",
8025 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
8026 sec
= elf_init_array_section
;
8030 if (elf_fini_array_section
== NULL
)
8031 elf_fini_array_section
8032 = get_section (".fini_array",
8033 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
8034 sec
= elf_fini_array_section
;
8040 /* Use .init_array section for constructors. */
8043 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
8045 section
*sec
= get_elf_initfini_array_priority_section (priority
,
8047 assemble_addr_to_section (symbol
, sec
);
8050 /* Use .fini_array section for destructors. */
8053 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
8055 section
*sec
= get_elf_initfini_array_priority_section (priority
,
8057 assemble_addr_to_section (symbol
, sec
);
8060 /* Default TARGET_ASM_OUTPUT_IDENT hook.
8062 This is a bit of a cheat. The real default is a no-op, but this
8063 hook is the default for all targets with a .ident directive. */
8066 default_asm_output_ident_directive (const char *ident_str
)
8068 const char *ident_asm_op
= "\t.ident\t";
8070 /* If we are still in the front end, do not write out the string
8071 to asm_out_file. Instead, add a fake top-level asm statement.
8072 This allows the front ends to use this hook without actually
8073 writing to asm_out_file, to handle #ident or Pragma Ident. */
8074 if (symtab
->state
== PARSING
)
8076 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
8077 symtab
->finalize_toplevel_asm (build_string (strlen (buf
), buf
));
8080 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
8084 /* This function ensures that vtable_map variables are not only
8085 in the comdat section, but that each variable has its own unique
8086 comdat name. Without this the variables end up in the same section
8087 with a single comdat name.
8089 FIXME: resolve_unique_section needs to deal better with
8090 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
8091 that is fixed, this if-else statement can be replaced with
8092 a single call to "switch_to_section (sect)". */
8095 handle_vtv_comdat_section (section
*sect
, const_tree decl ATTRIBUTE_UNUSED
)
8097 #if defined (OBJECT_FORMAT_ELF)
8098 targetm
.asm_out
.named_section (sect
->named
.name
,
8099 sect
->named
.common
.flags
8104 /* Neither OBJECT_FORMAT_PE, nor OBJECT_FORMAT_COFF is set here.
8105 Therefore the following check is used.
8106 In case a the target is PE or COFF a comdat group section
8107 is created, e.g. .vtable_map_vars$foo. The linker places
8108 everything in .vtable_map_vars at the end.
8110 A fix could be made in
8111 gcc/config/i386/winnt.c: i386_pe_unique_section. */
8116 if (TREE_CODE (DECL_NAME (decl
)) == IDENTIFIER_NODE
)
8117 name
= ACONCAT ((sect
->named
.name
, "$",
8118 IDENTIFIER_POINTER (DECL_NAME (decl
)), NULL
));
8120 name
= ACONCAT ((sect
->named
.name
, "$",
8121 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (DECL_NAME (decl
))),
8124 targetm
.asm_out
.named_section (name
,
8125 sect
->named
.common
.flags
8131 switch_to_section (sect
);
8135 #include "gt-varasm.h"