1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987-2016 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"
37 #include "stringpool.h"
41 #include "diagnostic-core.h"
42 #include "fold-const.h"
43 #include "stor-layout.h"
50 #include "langhooks.h"
52 #include "common/common-target.h"
56 #ifdef XCOFF_DEBUGGING_INFO
57 #include "xcoffout.h" /* Needed for external data declarations. */
60 /* The (assembler) name of the first globally-visible object output. */
61 extern GTY(()) const char *first_global_object_name
;
62 extern GTY(()) const char *weak_global_object_name
;
64 const char *first_global_object_name
;
65 const char *weak_global_object_name
;
68 struct constant_descriptor_rtx
;
69 struct rtx_constant_pool
;
71 #define n_deferred_constants (crtl->varasm.deferred_constants)
73 /* Number for making the label on the next
74 constant that is stored in memory. */
76 static GTY(()) int const_labelno
;
78 /* Carry information from ASM_DECLARE_OBJECT_NAME
79 to ASM_FINISH_DECLARE_OBJECT. */
81 int size_directive_output
;
83 /* The last decl for which assemble_variable was called,
84 if it did ASM_DECLARE_OBJECT_NAME.
85 If the last call to assemble_variable didn't do that,
88 tree last_assemble_variable_decl
;
90 /* The following global variable indicates if the first basic block
91 in a function belongs to the cold partition or not. */
93 bool first_function_block_is_cold
;
95 /* Whether we saw any functions with no_split_stack. */
97 static bool saw_no_split_stack
;
99 static const char *strip_reg_name (const char *);
100 static int contains_pointers_p (tree
);
101 #ifdef ASM_OUTPUT_EXTERNAL
102 static bool incorporeal_function_p (tree
);
104 static void decode_addr_const (tree
, struct addr_const
*);
105 static hashval_t
const_hash_1 (const tree
);
106 static int compare_constant (const tree
, const tree
);
107 static void output_constant_def_contents (rtx
);
108 static void output_addressed_constants (tree
);
109 static unsigned HOST_WIDE_INT
output_constant (tree
, unsigned HOST_WIDE_INT
,
111 static void globalize_decl (tree
);
112 static bool decl_readonly_section_1 (enum section_category
);
113 #ifdef BSS_SECTION_ASM_OP
114 #ifdef ASM_OUTPUT_ALIGNED_BSS
115 static void asm_output_aligned_bss (FILE *, tree
, const char *,
116 unsigned HOST_WIDE_INT
, int)
119 #endif /* BSS_SECTION_ASM_OP */
120 static void mark_weak (tree
);
121 static void output_constant_pool (const char *, tree
);
122 static void handle_vtv_comdat_section (section
*, const_tree
);
124 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
125 section
*text_section
;
126 section
*data_section
;
127 section
*readonly_data_section
;
128 section
*sdata_section
;
129 section
*ctors_section
;
130 section
*dtors_section
;
131 section
*bss_section
;
132 section
*sbss_section
;
134 /* Various forms of common section. All are guaranteed to be nonnull. */
135 section
*tls_comm_section
;
136 section
*comm_section
;
137 section
*lcomm_section
;
139 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
141 section
*bss_noswitch_section
;
143 /* The section that holds the main exception table, when known. The section
144 is set either by the target's init_sections hook or by the first call to
145 switch_to_exception_section. */
146 section
*exception_section
;
148 /* The section that holds the DWARF2 frame unwind information, when known.
149 The section is set either by the target's init_sections hook or by the
150 first call to switch_to_eh_frame_section. */
151 section
*eh_frame_section
;
153 /* asm_out_file's current section. This is NULL if no section has yet
154 been selected or if we lose track of what the current section is. */
157 /* True if code for the current function is currently being directed
158 at the cold section. */
159 bool in_cold_section_p
;
161 /* The following global holds the "function name" for the code in the
162 cold section of a function, if hot/cold function splitting is enabled
163 and there was actually code that went into the cold section. A
164 pseudo function name is needed for the cold section of code for some
165 debugging tools that perform symbolization. */
166 tree cold_function_name
= NULL_TREE
;
168 /* A linked list of all the unnamed sections. */
169 static GTY(()) section
*unnamed_sections
;
171 /* Return a nonzero value if DECL has a section attribute. */
172 #define IN_NAMED_SECTION(DECL) \
173 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
174 && DECL_SECTION_NAME (DECL) != NULL)
176 struct section_hasher
: ggc_ptr_hash
<section
>
178 typedef const char *compare_type
;
180 static hashval_t
hash (section
*);
181 static bool equal (section
*, const char *);
184 /* Hash table of named sections. */
185 static GTY(()) hash_table
<section_hasher
> *section_htab
;
187 struct object_block_hasher
: ggc_ptr_hash
<object_block
>
189 typedef const section
*compare_type
;
191 static hashval_t
hash (object_block
*);
192 static bool equal (object_block
*, const section
*);
195 /* A table of object_blocks, indexed by section. */
196 static GTY(()) hash_table
<object_block_hasher
> *object_block_htab
;
198 /* The next number to use for internal anchor labels. */
199 static GTY(()) int anchor_labelno
;
201 /* A pool of constants that can be shared between functions. */
202 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
204 /* Helper routines for maintaining section_htab. */
207 section_hasher::equal (section
*old
, const char *new_name
)
209 return strcmp (old
->named
.name
, new_name
) == 0;
213 section_hasher::hash (section
*old
)
215 return htab_hash_string (old
->named
.name
);
218 /* Return a hash value for section SECT. */
221 hash_section (section
*sect
)
223 if (sect
->common
.flags
& SECTION_NAMED
)
224 return htab_hash_string (sect
->named
.name
);
225 return sect
->common
.flags
;
228 /* Helper routines for maintaining object_block_htab. */
231 object_block_hasher::equal (object_block
*old
, const section
*new_section
)
233 return old
->sect
== new_section
;
237 object_block_hasher::hash (object_block
*old
)
239 return hash_section (old
->sect
);
242 /* Return a new unnamed section with the given fields. */
245 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
250 sect
= ggc_alloc
<section
> ();
251 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
252 sect
->unnamed
.callback
= callback
;
253 sect
->unnamed
.data
= data
;
254 sect
->unnamed
.next
= unnamed_sections
;
256 unnamed_sections
= sect
;
260 /* Return a SECTION_NOSWITCH section with the given fields. */
263 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
267 sect
= ggc_alloc
<section
> ();
268 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
269 sect
->noswitch
.callback
= callback
;
274 /* Return the named section structure associated with NAME. Create
275 a new section with the given fields if no such structure exists. */
278 get_section (const char *name
, unsigned int flags
, tree decl
)
280 section
*sect
, **slot
;
282 slot
= section_htab
->find_slot_with_hash (name
, htab_hash_string (name
),
284 flags
|= SECTION_NAMED
;
287 sect
= ggc_alloc
<section
> ();
288 sect
->named
.common
.flags
= flags
;
289 sect
->named
.name
= ggc_strdup (name
);
290 sect
->named
.decl
= decl
;
296 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
297 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
299 /* It is fine if one of the section flags is
300 SECTION_WRITE | SECTION_RELRO and the other has none of these
301 flags (i.e. read-only) in named sections and either the
302 section hasn't been declared yet or has been declared as writable.
303 In that case just make sure the resulting flags are
304 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
306 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
307 == (SECTION_WRITE
| SECTION_RELRO
)
308 && (sect
->common
.flags
309 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
310 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
311 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
312 || (sect
->common
.flags
& SECTION_WRITE
)))
314 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
317 /* Sanity check user variables for flag changes. */
318 if (sect
->named
.decl
!= NULL
319 && DECL_P (sect
->named
.decl
)
320 && decl
!= sect
->named
.decl
)
322 if (decl
!= NULL
&& DECL_P (decl
))
323 error ("%+D causes a section type conflict with %D",
324 decl
, sect
->named
.decl
);
326 error ("section type conflict with %D", sect
->named
.decl
);
327 inform (DECL_SOURCE_LOCATION (sect
->named
.decl
),
328 "%qD was declared here", sect
->named
.decl
);
330 else if (decl
!= NULL
&& DECL_P (decl
))
331 error ("%+D causes a section type conflict", decl
);
333 error ("section type conflict");
334 /* Make sure we don't error about one section multiple times. */
335 sect
->common
.flags
|= SECTION_OVERRIDE
;
341 /* Return true if the current compilation mode benefits from having
342 objects grouped into blocks. */
345 use_object_blocks_p (void)
347 return flag_section_anchors
;
350 /* Return the object_block structure for section SECT. Create a new
351 structure if we haven't created one already. Return null if SECT
354 static struct object_block
*
355 get_block_for_section (section
*sect
)
357 struct object_block
*block
;
363 = object_block_htab
->find_slot_with_hash (sect
, hash_section (sect
),
368 block
= ggc_cleared_alloc
<object_block
> ();
375 /* Create a symbol with label LABEL and place it at byte offset
376 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
377 is not yet known. LABEL must be a garbage-collected string. */
380 create_block_symbol (const char *label
, struct object_block
*block
,
381 HOST_WIDE_INT offset
)
386 /* Create the extended SYMBOL_REF. */
387 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
388 symbol
= (rtx
) ggc_internal_alloc (size
);
390 /* Initialize the normal SYMBOL_REF fields. */
391 memset (symbol
, 0, size
);
392 PUT_CODE (symbol
, SYMBOL_REF
);
393 PUT_MODE (symbol
, Pmode
);
394 XSTR (symbol
, 0) = label
;
395 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
397 /* Initialize the block_symbol stuff. */
398 SYMBOL_REF_BLOCK (symbol
) = block
;
399 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
404 /* Return a section with a particular name and with whatever SECTION_*
405 flags section_type_flags deems appropriate. The name of the section
406 is taken from NAME if nonnull, otherwise it is taken from DECL's
407 DECL_SECTION_NAME. DECL is the decl associated with the section
408 (see the section comment for details) and RELOC is as for
409 section_type_flags. */
412 get_named_section (tree decl
, const char *name
, int reloc
)
418 gcc_assert (decl
&& DECL_P (decl
) && DECL_SECTION_NAME (decl
));
419 name
= DECL_SECTION_NAME (decl
);
422 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
423 return get_section (name
, flags
, decl
);
426 /* Worker for resolve_unique_section. */
429 set_implicit_section (struct symtab_node
*n
, void *data ATTRIBUTE_UNUSED
)
431 n
->implicit_section
= true;
435 /* If required, set DECL_SECTION_NAME to a unique name. */
438 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
439 int flag_function_or_data_sections
)
441 if (DECL_SECTION_NAME (decl
) == NULL
442 && targetm_common
.have_named_sections
443 && (flag_function_or_data_sections
444 || DECL_COMDAT_GROUP (decl
)))
446 targetm
.asm_out
.unique_section (decl
, reloc
);
447 if (DECL_SECTION_NAME (decl
))
448 symtab_node::get (decl
)->call_for_symbol_and_aliases
449 (set_implicit_section
, NULL
, true);
453 #ifdef BSS_SECTION_ASM_OP
455 #ifdef ASM_OUTPUT_ALIGNED_BSS
457 /* Utility function for targets to use in implementing
458 ASM_OUTPUT_ALIGNED_BSS.
459 ??? It is believed that this function will work in most cases so such
460 support is localized here. */
463 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
464 const char *name
, unsigned HOST_WIDE_INT size
,
467 switch_to_section (bss_section
);
468 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
469 #ifdef ASM_DECLARE_OBJECT_NAME
470 last_assemble_variable_decl
= decl
;
471 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
473 /* Standard thing is just output label for the object. */
474 ASM_OUTPUT_LABEL (file
, name
);
475 #endif /* ASM_DECLARE_OBJECT_NAME */
476 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
481 #endif /* BSS_SECTION_ASM_OP */
483 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
484 /* Return the hot section for function DECL. Return text_section for
488 hot_function_section (tree decl
)
490 if (decl
!= NULL_TREE
491 && DECL_SECTION_NAME (decl
) != NULL
492 && targetm_common
.have_named_sections
)
493 return get_named_section (decl
, NULL
, 0);
499 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
502 When DECL_SECTION_NAME is non-NULL and it is implicit section and
503 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
504 concatenate the name with NAMED_SECTION_SUFFIX.
505 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
508 get_named_text_section (tree decl
,
509 const char *text_section_name
,
510 const char *named_section_suffix
)
512 if (decl
&& DECL_SECTION_NAME (decl
))
514 if (named_section_suffix
)
516 const char *dsn
= DECL_SECTION_NAME (decl
);
517 const char *stripped_name
;
520 name
= (char *) alloca (strlen (dsn
) + 1);
524 stripped_name
= targetm
.strip_name_encoding (name
);
526 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
527 return get_named_section (decl
, buffer
, 0);
529 else if (symtab_node::get (decl
)->implicit_section
)
533 /* Do not try to split gnu_linkonce functions. This gets somewhat
535 if (DECL_COMDAT_GROUP (decl
) && !HAVE_COMDAT_GROUP
)
537 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
538 name
= targetm
.strip_name_encoding (name
);
539 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
545 return get_named_section (decl
, text_section_name
, 0);
548 /* Choose named function section based on its frequency. */
551 default_function_section (tree decl
, enum node_frequency freq
,
552 bool startup
, bool exit
)
554 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
555 /* Old GNU linkers have buggy --gc-section support, which sometimes
556 results in .gcc_except_table* sections being garbage collected. */
558 && symtab_node::get (decl
)->implicit_section
)
562 if (!flag_reorder_functions
563 || !targetm_common
.have_named_sections
)
565 /* Startup code should go to startup subsection unless it is
566 unlikely executed (this happens especially with function splitting
567 where we can split away unnecessary parts of static constructors. */
568 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
570 /* If we do have a profile or(and) LTO phase is executed, we do not need
571 these ELF section. */
572 if (!in_lto_p
|| !flag_profile_values
)
573 return get_named_text_section (decl
, ".text.startup", NULL
);
578 /* Similarly for exit. */
579 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
580 return get_named_text_section (decl
, ".text.exit", NULL
);
582 /* Group cold functions together, similarly for hot code. */
585 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
586 return get_named_text_section (decl
, ".text.unlikely", NULL
);
587 case NODE_FREQUENCY_HOT
:
588 /* If we do have a profile or(and) LTO phase is executed, we do not need
589 these ELF section. */
590 if (!in_lto_p
|| !flag_profile_values
)
591 return get_named_text_section (decl
, ".text.hot", NULL
);
597 /* Return the section for function DECL.
599 If DECL is NULL_TREE, return the text section. We can be passed
600 NULL_TREE under some circumstances by dbxout.c at least.
602 If FORCE_COLD is true, return cold function section ignoring
603 the frequency info of cgraph_node. */
606 function_section_1 (tree decl
, bool force_cold
)
608 section
*section
= NULL
;
609 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
610 bool startup
= false, exit
= false;
614 struct cgraph_node
*node
= cgraph_node::get (decl
);
618 freq
= node
->frequency
;
619 startup
= node
->only_called_at_startup
;
620 exit
= node
->only_called_at_exit
;
624 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
626 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
627 if (decl
!= NULL_TREE
628 && DECL_SECTION_NAME (decl
) != NULL
)
630 if (targetm
.asm_out
.function_section
)
631 section
= targetm
.asm_out
.function_section (decl
, freq
,
635 return get_named_section (decl
, NULL
, 0);
638 return targetm
.asm_out
.select_section
639 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
640 symtab_node::get (decl
)->definition_alignment ());
642 if (targetm
.asm_out
.function_section
)
643 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
646 return hot_function_section (decl
);
650 /* Return the section for function DECL.
652 If DECL is NULL_TREE, return the text section. We can be passed
653 NULL_TREE under some circumstances by dbxout.c at least. */
656 function_section (tree decl
)
658 /* Handle cases where function splitting code decides
659 to put function entry point into unlikely executed section
660 despite the fact that the function itself is not cold
661 (i.e. it is called rarely but contains a hot loop that is
662 better to live in hot subsection for the code locality). */
663 return function_section_1 (decl
,
664 first_function_block_is_cold
);
667 /* Return the section for the current function, take IN_COLD_SECTION_P
671 current_function_section (void)
673 return function_section_1 (current_function_decl
, in_cold_section_p
);
676 /* Tell assembler to switch to unlikely-to-be-executed text section. */
679 unlikely_text_section (void)
681 return function_section_1 (current_function_decl
, true);
684 /* When called within a function context, return true if the function
685 has been assigned a cold text section and if SECT is that section.
686 When called outside a function context, return true if SECT is the
687 default cold section. */
690 unlikely_text_section_p (section
*sect
)
692 return sect
== function_section_1 (current_function_decl
, true);
695 /* Return the read-only data section associated with function DECL. */
698 default_function_rodata_section (tree decl
)
700 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
702 const char *name
= DECL_SECTION_NAME (decl
);
704 if (DECL_COMDAT_GROUP (decl
) && HAVE_COMDAT_GROUP
)
710 dot
= strchr (name
+ 1, '.');
713 len
= strlen (dot
) + 8;
714 rname
= (char *) alloca (len
);
716 strcpy (rname
, ".rodata");
718 return get_section (rname
, SECTION_LINKONCE
, decl
);
720 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
721 else if (DECL_COMDAT_GROUP (decl
)
722 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
724 size_t len
= strlen (name
) + 1;
725 char *rname
= (char *) alloca (len
);
727 memcpy (rname
, name
, len
);
729 return get_section (rname
, SECTION_LINKONCE
, decl
);
731 /* For .text.foo we want to use .rodata.foo. */
732 else if (flag_function_sections
&& flag_data_sections
733 && strncmp (name
, ".text.", 6) == 0)
735 size_t len
= strlen (name
) + 1;
736 char *rname
= (char *) alloca (len
+ 2);
738 memcpy (rname
, ".rodata", 7);
739 memcpy (rname
+ 7, name
+ 5, len
- 5);
740 return get_section (rname
, 0, decl
);
744 return readonly_data_section
;
747 /* Return the read-only data section associated with function DECL
748 for targets where that section should be always the single
749 readonly data section. */
752 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
754 return readonly_data_section
;
757 /* A subroutine of mergeable_string_section and mergeable_constant_section. */
760 function_mergeable_rodata_prefix (void)
762 section
*s
= targetm
.asm_out
.function_rodata_section (current_function_decl
);
763 if (SECTION_STYLE (s
) == SECTION_NAMED
)
764 return s
->named
.name
;
766 return targetm
.asm_out
.mergeable_rodata_prefix
;
769 /* Return the section to use for string merging. */
772 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
773 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
774 unsigned int flags ATTRIBUTE_UNUSED
)
778 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
779 && TREE_CODE (decl
) == STRING_CST
780 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
782 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
783 && TREE_STRING_LENGTH (decl
) >= len
)
786 unsigned int modesize
;
790 const char *prefix
= function_mergeable_rodata_prefix ();
791 char *name
= (char *) alloca (strlen (prefix
) + 30);
793 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
794 modesize
= GET_MODE_BITSIZE (mode
);
795 if (modesize
>= 8 && modesize
<= 256
796 && (modesize
& (modesize
- 1)) == 0)
798 if (align
< modesize
)
801 str
= TREE_STRING_POINTER (decl
);
802 unit
= GET_MODE_SIZE (mode
);
804 /* Check for embedded NUL characters. */
805 for (i
= 0; i
< len
; i
+= unit
)
807 for (j
= 0; j
< unit
; j
++)
808 if (str
[i
+ j
] != '\0')
815 sprintf (name
, "%s.str%d.%d", prefix
,
816 modesize
/ 8, (int) (align
/ 8));
817 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
818 return get_section (name
, flags
, NULL
);
823 return readonly_data_section
;
826 /* Return the section to use for constant merging. */
829 mergeable_constant_section (machine_mode mode ATTRIBUTE_UNUSED
,
830 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
831 unsigned int flags ATTRIBUTE_UNUSED
)
833 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
835 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
841 && (align
& (align
- 1)) == 0)
843 const char *prefix
= function_mergeable_rodata_prefix ();
844 char *name
= (char *) alloca (strlen (prefix
) + 30);
846 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
847 flags
|= (align
/ 8) | SECTION_MERGE
;
848 return get_section (name
, flags
, NULL
);
850 return readonly_data_section
;
853 /* Given NAME, a putative register name, discard any customary prefixes. */
856 strip_reg_name (const char *name
)
858 #ifdef REGISTER_PREFIX
859 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
860 name
+= strlen (REGISTER_PREFIX
);
862 if (name
[0] == '%' || name
[0] == '#')
867 /* The user has asked for a DECL to have a particular name. Set (or
868 change) it in such a way that we don't prefix an underscore to
871 set_user_assembler_name (tree decl
, const char *name
)
873 char *starred
= (char *) alloca (strlen (name
) + 2);
875 strcpy (starred
+ 1, name
);
876 symtab
->change_decl_assembler_name (decl
, get_identifier (starred
));
877 SET_DECL_RTL (decl
, NULL_RTX
);
880 /* Decode an `asm' spec for a declaration as a register name.
881 Return the register number, or -1 if nothing specified,
882 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
883 or -3 if ASMSPEC is `cc' and is not recognized,
884 or -4 if ASMSPEC is `memory' and is not recognized.
885 Accept an exact spelling or a decimal number.
886 Prefixes such as % are optional. */
889 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
891 /* Presume just one register is clobbered. */
898 /* Get rid of confusing prefixes. */
899 asmspec
= strip_reg_name (asmspec
);
901 /* Allow a decimal number as a "register name". */
902 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
903 if (! ISDIGIT (asmspec
[i
]))
905 if (asmspec
[0] != 0 && i
< 0)
908 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0 && reg_names
[i
][0])
914 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
916 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
919 #ifdef OVERLAPPING_REGISTER_NAMES
923 const char *const name
;
926 } table
[] = OVERLAPPING_REGISTER_NAMES
;
928 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
930 && ! strcmp (asmspec
, table
[i
].name
))
932 *pnregs
= table
[i
].nregs
;
933 return table
[i
].number
;
936 #endif /* OVERLAPPING_REGISTER_NAMES */
938 #ifdef ADDITIONAL_REGISTER_NAMES
940 static const struct { const char *const name
; const int number
; } table
[]
941 = ADDITIONAL_REGISTER_NAMES
;
943 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
945 && ! strcmp (asmspec
, table
[i
].name
)
946 && reg_names
[table
[i
].number
][0])
947 return table
[i
].number
;
949 #endif /* ADDITIONAL_REGISTER_NAMES */
951 if (!strcmp (asmspec
, "memory"))
954 if (!strcmp (asmspec
, "cc"))
964 decode_reg_name (const char *name
)
967 return decode_reg_name_and_count (name
, &count
);
971 /* Return true if DECL's initializer is suitable for a BSS section. */
974 bss_initializer_p (const_tree decl
)
976 return (DECL_INITIAL (decl
) == NULL
977 /* In LTO we have no errors in program; error_mark_node is used
978 to mark offlined constructors. */
979 || (DECL_INITIAL (decl
) == error_mark_node
981 || (flag_zero_initialized_in_bss
982 /* Leave constant zeroes in .rodata so they
984 && !TREE_READONLY (decl
)
985 && initializer_zerop (DECL_INITIAL (decl
))));
988 /* Compute the alignment of variable specified by DECL.
989 DONT_OUTPUT_DATA is from assemble_variable. */
992 align_variable (tree decl
, bool dont_output_data
)
994 unsigned int align
= DECL_ALIGN (decl
);
996 /* In the case for initialing an array whose length isn't specified,
997 where we have not yet been able to do the layout,
998 figure out the proper alignment now. */
999 if (dont_output_data
&& DECL_SIZE (decl
) == 0
1000 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
1001 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
1003 /* Some object file formats have a maximum alignment which they support.
1004 In particular, a.out format supports a maximum alignment of 4. */
1005 if (align
> MAX_OFILE_ALIGNMENT
)
1007 error ("alignment of %q+D is greater than maximum object "
1008 "file alignment %d", decl
,
1009 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
1010 align
= MAX_OFILE_ALIGNMENT
;
1013 if (! DECL_USER_ALIGN (decl
))
1015 #ifdef DATA_ABI_ALIGNMENT
1016 unsigned int data_abi_align
1017 = DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1018 /* For backwards compatibility, don't assume the ABI alignment for
1020 if (! DECL_THREAD_LOCAL_P (decl
) || data_abi_align
<= BITS_PER_WORD
)
1021 align
= data_abi_align
;
1024 /* On some machines, it is good to increase alignment sometimes.
1025 But as DECL_ALIGN is used both for actually emitting the variable
1026 and for code accessing the variable as guaranteed alignment, we
1027 can only increase the alignment if it is a performance optimization
1028 if the references to it must bind to the current definition. */
1029 if (decl_binds_to_current_def_p (decl
)
1030 && !DECL_VIRTUAL_P (decl
))
1032 #ifdef DATA_ALIGNMENT
1033 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1034 /* Don't increase alignment too much for TLS variables - TLS space
1036 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1039 if (DECL_INITIAL (decl
) != 0
1040 /* In LTO we have no errors in program; error_mark_node is used
1041 to mark offlined constructors. */
1042 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1044 unsigned int const_align
1045 = CONSTANT_ALIGNMENT (DECL_INITIAL (decl
), align
);
1046 /* Don't increase alignment too much for TLS variables - TLS
1047 space is too precious. */
1048 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1049 align
= const_align
;
1054 /* Reset the alignment in case we have made it tighter, so we can benefit
1055 from it in get_pointer_alignment. */
1056 DECL_ALIGN (decl
) = align
;
1059 /* Return DECL_ALIGN (decl), possibly increased for optimization purposes
1060 beyond what align_variable returned. */
1063 get_variable_align (tree decl
)
1065 unsigned int align
= DECL_ALIGN (decl
);
1067 /* For user aligned vars or static vars align_variable already did
1069 if (DECL_USER_ALIGN (decl
) || !TREE_PUBLIC (decl
))
1072 #ifdef DATA_ABI_ALIGNMENT
1073 if (DECL_THREAD_LOCAL_P (decl
))
1074 align
= DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1077 /* For decls that bind to the current definition, align_variable
1078 did also everything, except for not assuming ABI required alignment
1079 of TLS variables. For other vars, increase the alignment here
1080 as an optimization. */
1081 if (!decl_binds_to_current_def_p (decl
))
1083 /* On some machines, it is good to increase alignment sometimes. */
1084 #ifdef DATA_ALIGNMENT
1085 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1086 /* Don't increase alignment too much for TLS variables - TLS space
1088 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1091 if (DECL_INITIAL (decl
) != 0
1092 /* In LTO we have no errors in program; error_mark_node is used
1093 to mark offlined constructors. */
1094 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1096 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
1098 /* Don't increase alignment too much for TLS variables - TLS space
1100 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1101 align
= const_align
;
1108 /* Return the section into which the given VAR_DECL or CONST_DECL
1109 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1110 section should be used wherever possible. */
1113 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1115 addr_space_t as
= ADDR_SPACE_GENERIC
;
1117 varpool_node
*vnode
= varpool_node::get (decl
);
1120 vnode
= vnode
->ultimate_alias_target ();
1124 if (TREE_TYPE (decl
) != error_mark_node
)
1125 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1127 /* We need the constructor to figure out reloc flag. */
1129 vnode
->get_constructor ();
1131 if (DECL_COMMON (decl
))
1133 /* If the decl has been given an explicit section name, or it resides
1134 in a non-generic address space, then it isn't common, and shouldn't
1135 be handled as such. */
1136 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1137 && ADDR_SPACE_GENERIC_P (as
));
1138 if (DECL_THREAD_LOCAL_P (decl
))
1139 return tls_comm_section
;
1140 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1141 return comm_section
;
1144 if (DECL_INITIAL (decl
) == error_mark_node
)
1145 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1146 else if (DECL_INITIAL (decl
))
1147 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1151 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1152 if (IN_NAMED_SECTION (decl
))
1153 return get_named_section (decl
, NULL
, reloc
);
1155 if (ADDR_SPACE_GENERIC_P (as
)
1156 && !DECL_THREAD_LOCAL_P (decl
)
1157 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1158 && bss_initializer_p (decl
))
1160 if (!TREE_PUBLIC (decl
)
1161 && !((flag_sanitize
& SANITIZE_ADDRESS
)
1162 && asan_protect_global (decl
)))
1163 return lcomm_section
;
1164 if (bss_noswitch_section
)
1165 return bss_noswitch_section
;
1168 return targetm
.asm_out
.select_section (decl
, reloc
,
1169 get_variable_align (decl
));
1172 /* Return the block into which object_block DECL should be placed. */
1174 static struct object_block
*
1175 get_block_for_decl (tree decl
)
1179 if (TREE_CODE (decl
) == VAR_DECL
)
1181 /* The object must be defined in this translation unit. */
1182 if (DECL_EXTERNAL (decl
))
1185 /* There's no point using object blocks for something that is
1186 isolated by definition. */
1187 if (DECL_COMDAT_GROUP (decl
))
1191 /* We can only calculate block offsets if the decl has a known
1193 if (DECL_SIZE_UNIT (decl
) == NULL
)
1195 if (!tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
)))
1198 /* Find out which section should contain DECL. We cannot put it into
1199 an object block if it requires a standalone definition. */
1200 if (TREE_CODE (decl
) == VAR_DECL
)
1201 align_variable (decl
, 0);
1202 sect
= get_variable_section (decl
, true);
1203 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1206 return get_block_for_section (sect
);
1209 /* Make sure block symbol SYMBOL is in block BLOCK. */
1212 change_symbol_block (rtx symbol
, struct object_block
*block
)
1214 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1216 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1217 SYMBOL_REF_BLOCK (symbol
) = block
;
1221 /* Return true if it is possible to put DECL in an object_block. */
1224 use_blocks_for_decl_p (tree decl
)
1226 struct symtab_node
*snode
;
1228 /* Only data DECLs can be placed into object blocks. */
1229 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1232 /* Detect decls created by dw2_force_const_mem. Such decls are
1233 special because DECL_INITIAL doesn't specify the decl's true value.
1234 dw2_output_indirect_constants will instead call assemble_variable
1235 with dont_output_data set to 1 and then print the contents itself. */
1236 if (DECL_INITIAL (decl
) == decl
)
1239 /* If this decl is an alias, then we don't want to emit a
1241 if (TREE_CODE (decl
) == VAR_DECL
1242 && (snode
= symtab_node::get (decl
)) != NULL
1246 return targetm
.use_blocks_for_decl_p (decl
);
1249 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
1250 until we find an identifier that is not itself a transparent alias.
1251 Modify the alias passed to it by reference (and all aliases on the
1252 way to the ultimate target), such that they do not have to be
1253 followed again, and return the ultimate target of the alias
1257 ultimate_transparent_alias_target (tree
*alias
)
1259 tree target
= *alias
;
1261 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
1263 gcc_assert (TREE_CHAIN (target
));
1264 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
1265 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
1266 && ! TREE_CHAIN (target
));
1273 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1274 have static storage duration. In other words, it should not be an
1275 automatic variable, including PARM_DECLs.
1277 There is, however, one exception: this function handles variables
1278 explicitly placed in a particular register by the user.
1280 This is never called for PARM_DECL nodes. */
1283 make_decl_rtl (tree decl
)
1285 const char *name
= 0;
1290 /* Check that we are not being given an automatic variable. */
1291 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1292 && TREE_CODE (decl
) != RESULT_DECL
);
1294 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1295 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1296 || TREE_STATIC (decl
)
1297 || TREE_PUBLIC (decl
)
1298 || DECL_EXTERNAL (decl
)
1299 || DECL_REGISTER (decl
));
1301 /* And that we were not given a type or a label. */
1302 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1303 && TREE_CODE (decl
) != LABEL_DECL
);
1305 /* For a duplicate declaration, we can be called twice on the
1306 same DECL node. Don't discard the RTL already made. */
1307 if (DECL_RTL_SET_P (decl
))
1309 /* If the old RTL had the wrong mode, fix the mode. */
1310 x
= DECL_RTL (decl
);
1311 if (GET_MODE (x
) != DECL_MODE (decl
))
1312 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1314 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1317 /* ??? Another way to do this would be to maintain a hashed
1318 table of such critters. Instead of adding stuff to a DECL
1319 to give certain attributes to it, we could use an external
1320 hash map from DECL to set of attributes. */
1322 /* Let the target reassign the RTL if it wants.
1323 This is necessary, for example, when one machine specific
1324 decl attribute overrides another. */
1325 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1327 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1328 on the new decl information. */
1330 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1331 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1332 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1337 /* If this variable belongs to the global constant pool, retrieve the
1338 pre-computed RTL or recompute it in LTO mode. */
1339 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_IN_CONSTANT_POOL (decl
))
1341 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1345 id
= DECL_ASSEMBLER_NAME (decl
);
1346 if (TREE_CODE (decl
) == FUNCTION_DECL
1347 && cgraph_node::get (decl
)
1348 && cgraph_node::get (decl
)->instrumentation_clone
)
1349 ultimate_transparent_alias_target (&id
);
1350 name
= IDENTIFIER_POINTER (id
);
1352 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1353 && DECL_REGISTER (decl
))
1355 error ("register name not specified for %q+D", decl
);
1357 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1359 const char *asmspec
= name
+1;
1360 machine_mode mode
= DECL_MODE (decl
);
1361 reg_number
= decode_reg_name (asmspec
);
1362 /* First detect errors in declaring global registers. */
1363 if (reg_number
== -1)
1364 error ("register name not specified for %q+D", decl
);
1365 else if (reg_number
< 0)
1366 error ("invalid register name for %q+D", decl
);
1367 else if (mode
== BLKmode
)
1368 error ("data type of %q+D isn%'t suitable for a register",
1370 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1371 error ("the register specified for %q+D cannot be accessed"
1372 " by the current target", decl
);
1373 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1374 error ("the register specified for %q+D is not general enough"
1375 " to be used as a register variable", decl
);
1376 else if (!HARD_REGNO_MODE_OK (reg_number
, mode
))
1377 error ("register specified for %q+D isn%'t suitable for data type",
1379 /* Now handle properly declared static register variables. */
1384 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1386 DECL_INITIAL (decl
) = 0;
1387 error ("global register variable has initial value");
1389 if (TREE_THIS_VOLATILE (decl
))
1390 warning (OPT_Wvolatile_register_var
,
1391 "optimization may eliminate reads and/or "
1392 "writes to register variables");
1394 /* If the user specified one of the eliminables registers here,
1395 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1396 confused with that register and be eliminated. This usage is
1397 somewhat suspect... */
1399 SET_DECL_RTL (decl
, gen_raw_REG (mode
, reg_number
));
1400 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1401 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1403 if (TREE_STATIC (decl
))
1405 /* Make this register global, so not usable for anything
1407 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1408 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1409 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1411 nregs
= hard_regno_nregs
[reg_number
][mode
];
1413 globalize_reg (decl
, reg_number
+ --nregs
);
1416 /* As a register variable, it has no section. */
1419 /* Avoid internal errors from invalid register
1421 SET_DECL_ASSEMBLER_NAME (decl
, NULL_TREE
);
1422 DECL_HARD_REGISTER (decl
) = 0;
1423 /* Also avoid SSA inconsistencies by pretending this is an external
1425 DECL_EXTERNAL (decl
) = 1;
1428 /* Now handle ordinary static variables and functions (in memory).
1429 Also handle vars declared register invalidly. */
1430 else if (name
[0] == '*')
1432 #ifdef REGISTER_PREFIX
1433 if (strlen (REGISTER_PREFIX
) != 0)
1435 reg_number
= decode_reg_name (name
);
1436 if (reg_number
>= 0 || reg_number
== -3)
1437 error ("register name given for non-register variable %q+D", decl
);
1442 /* Specifying a section attribute on a variable forces it into a
1443 non-.bss section, and thus it cannot be common. */
1444 /* FIXME: In general this code should not be necessary because
1445 visibility pass is doing the same work. But notice_global_symbol
1446 is called early and it needs to make DECL_RTL to get the name.
1447 we take care of recomputing the DECL_RTL after visibility is changed. */
1448 if (TREE_CODE (decl
) == VAR_DECL
1449 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
))
1450 && DECL_SECTION_NAME (decl
) != NULL
1451 && DECL_INITIAL (decl
) == NULL_TREE
1452 && DECL_COMMON (decl
))
1453 DECL_COMMON (decl
) = 0;
1455 /* Variables can't be both common and weak. */
1456 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1457 DECL_COMMON (decl
) = 0;
1459 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1460 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1463 machine_mode address_mode
= Pmode
;
1464 if (TREE_TYPE (decl
) != error_mark_node
)
1466 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1467 address_mode
= targetm
.addr_space
.address_mode (as
);
1469 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1471 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1472 SET_SYMBOL_REF_DECL (x
, decl
);
1474 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1475 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1476 set_mem_attributes (x
, decl
, 1);
1477 SET_DECL_RTL (decl
, x
);
1479 /* Optionally set flags or add text to the name to record information
1480 such as that it is a function name.
1481 If the name is changed, the macro ASM_OUTPUT_LABELREF
1482 will have to know how to strip this information. */
1483 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1486 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1487 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1491 make_decl_rtl_for_debug (tree decl
)
1493 unsigned int save_aliasing_flag
;
1496 if (DECL_RTL_SET_P (decl
))
1497 return DECL_RTL (decl
);
1499 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1500 call new_alias_set. If running with -fcompare-debug, sometimes
1501 we do not want to create alias sets that will throw the alias
1502 numbers off in the comparison dumps. So... clearing
1503 flag_strict_aliasing will keep new_alias_set() from creating a
1505 save_aliasing_flag
= flag_strict_aliasing
;
1506 flag_strict_aliasing
= 0;
1508 rtl
= DECL_RTL (decl
);
1509 /* Reset DECL_RTL back, as various parts of the compiler expects
1510 DECL_RTL set meaning it is actually going to be output. */
1511 SET_DECL_RTL (decl
, NULL
);
1513 flag_strict_aliasing
= save_aliasing_flag
;
1517 /* Output a string of literal assembler code
1518 for an `asm' keyword used between functions. */
1521 assemble_asm (tree string
)
1526 if (TREE_CODE (string
) == ADDR_EXPR
)
1527 string
= TREE_OPERAND (string
, 0);
1529 p
= TREE_STRING_POINTER (string
);
1530 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1533 /* Write the address of the entity given by SYMBOL to SEC. */
1535 assemble_addr_to_section (rtx symbol
, section
*sec
)
1537 switch_to_section (sec
);
1538 assemble_align (POINTER_SIZE
);
1539 assemble_integer (symbol
, POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
1542 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1543 not) section for PRIORITY. */
1545 get_cdtor_priority_section (int priority
, bool constructor_p
)
1549 /* ??? This only works reliably with the GNU linker. */
1550 sprintf (buf
, "%s.%.5u",
1551 constructor_p
? ".ctors" : ".dtors",
1552 /* Invert the numbering so the linker puts us in the proper
1553 order; constructors are run from right to left, and the
1554 linker sorts in increasing order. */
1555 MAX_INIT_PRIORITY
- priority
);
1556 return get_section (buf
, SECTION_WRITE
, NULL
);
1560 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1564 if (priority
!= DEFAULT_INIT_PRIORITY
)
1565 sec
= get_cdtor_priority_section (priority
,
1566 /*constructor_p=*/false);
1568 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1570 assemble_addr_to_section (symbol
, sec
);
1573 #ifdef DTORS_SECTION_ASM_OP
1575 default_dtor_section_asm_out_destructor (rtx symbol
,
1576 int priority ATTRIBUTE_UNUSED
)
1578 assemble_addr_to_section (symbol
, dtors_section
);
1583 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1587 if (priority
!= DEFAULT_INIT_PRIORITY
)
1588 sec
= get_cdtor_priority_section (priority
,
1589 /*constructor_p=*/true);
1591 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1593 assemble_addr_to_section (symbol
, sec
);
1596 #ifdef CTORS_SECTION_ASM_OP
1598 default_ctor_section_asm_out_constructor (rtx symbol
,
1599 int priority ATTRIBUTE_UNUSED
)
1601 assemble_addr_to_section (symbol
, ctors_section
);
1605 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1606 a nonzero value if the constant pool should be output before the
1607 start of the function, or a zero value if the pool should output
1608 after the end of the function. The default is to put it before the
1611 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1612 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1615 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1616 to be output to assembler.
1617 Set first_global_object_name and weak_global_object_name as appropriate. */
1620 notice_global_symbol (tree decl
)
1622 const char **t
= &first_global_object_name
;
1624 if (first_global_object_name
1625 || !TREE_PUBLIC (decl
)
1626 || DECL_EXTERNAL (decl
)
1627 || !DECL_NAME (decl
)
1628 || (TREE_CODE (decl
) == VAR_DECL
&& DECL_HARD_REGISTER (decl
))
1629 || (TREE_CODE (decl
) != FUNCTION_DECL
1630 && (TREE_CODE (decl
) != VAR_DECL
1631 || (DECL_COMMON (decl
)
1632 && (DECL_INITIAL (decl
) == 0
1633 || DECL_INITIAL (decl
) == error_mark_node
)))))
1636 /* We win when global object is found, but it is useful to know about weak
1637 symbol as well so we can produce nicer unique names. */
1638 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1639 t
= &weak_global_object_name
;
1643 tree id
= DECL_ASSEMBLER_NAME (decl
);
1644 ultimate_transparent_alias_target (&id
);
1645 *t
= ggc_strdup (targetm
.strip_name_encoding (IDENTIFIER_POINTER (id
)));
1649 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1650 current function goes into the cold section, so that targets can use
1651 current_function_section during RTL expansion. DECL describes the
1655 decide_function_section (tree decl
)
1657 first_function_block_is_cold
= false;
1659 if (flag_reorder_blocks_and_partition
)
1660 /* We will decide in assemble_start_function. */
1663 if (DECL_SECTION_NAME (decl
))
1665 struct cgraph_node
*node
= cgraph_node::get (current_function_decl
);
1666 /* Calls to function_section rely on first_function_block_is_cold
1668 first_function_block_is_cold
= (node
1670 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1673 in_cold_section_p
= first_function_block_is_cold
;
1676 /* Get the function's name, as described by its RTL. This may be
1677 different from the DECL_NAME name used in the source file. */
1679 get_fnname_from_decl (tree decl
)
1681 rtx x
= DECL_RTL (decl
);
1682 gcc_assert (MEM_P (x
));
1684 gcc_assert (GET_CODE (x
) == SYMBOL_REF
);
1688 /* Output assembler code for the constant pool of a function and associated
1689 with defining the name of the function. DECL describes the function.
1690 NAME is the function's name. For the constant pool, we use the current
1691 constant pool data. */
1694 assemble_start_function (tree decl
, const char *fnname
)
1697 char tmp_label
[100];
1698 bool hot_label_written
= false;
1700 if (flag_reorder_blocks_and_partition
)
1702 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1703 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1704 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1705 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1706 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1707 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1708 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1709 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1711 cold_function_name
= NULL_TREE
;
1715 crtl
->subsections
.hot_section_label
= NULL
;
1716 crtl
->subsections
.cold_section_label
= NULL
;
1717 crtl
->subsections
.hot_section_end_label
= NULL
;
1718 crtl
->subsections
.cold_section_end_label
= NULL
;
1721 /* The following code does not need preprocessing in the assembler. */
1725 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1726 output_constant_pool (fnname
, decl
);
1728 align
= symtab_node::get (decl
)->definition_alignment ();
1730 /* Make sure the not and cold text (code) sections are properly
1731 aligned. This is necessary here in the case where the function
1732 has both hot and cold sections, because we don't want to re-set
1733 the alignment when the section switch happens mid-function. */
1735 if (flag_reorder_blocks_and_partition
)
1737 first_function_block_is_cold
= false;
1739 switch_to_section (unlikely_text_section ());
1740 assemble_align (align
);
1741 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1743 /* When the function starts with a cold section, we need to explicitly
1744 align the hot section and write out the hot section label.
1745 But if the current function is a thunk, we do not have a CFG. */
1747 && BB_PARTITION (ENTRY_BLOCK_PTR_FOR_FN (cfun
)->next_bb
) == BB_COLD_PARTITION
)
1749 switch_to_section (text_section
);
1750 assemble_align (align
);
1751 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1752 hot_label_written
= true;
1753 first_function_block_is_cold
= true;
1755 in_cold_section_p
= first_function_block_is_cold
;
1759 /* Switch to the correct text section for the start of the function. */
1761 switch_to_section (function_section (decl
));
1762 if (flag_reorder_blocks_and_partition
1763 && !hot_label_written
)
1764 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1766 /* Tell assembler to move to target machine's alignment for functions. */
1767 align
= floor_log2 (align
/ BITS_PER_UNIT
);
1770 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1773 /* Handle a user-specified function alignment.
1774 Note that we still need to align to DECL_ALIGN, as above,
1775 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1776 if (! DECL_USER_ALIGN (decl
)
1777 && align_functions_log
> align
1778 && optimize_function_for_speed_p (cfun
))
1780 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1781 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1782 align_functions_log
, align_functions
- 1);
1784 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1788 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1789 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1792 if (!DECL_IGNORED_P (decl
))
1793 (*debug_hooks
->begin_function
) (decl
);
1795 /* Make function name accessible from other files, if appropriate. */
1797 if (TREE_PUBLIC (decl
)
1798 || (cgraph_node::get (decl
)->instrumentation_clone
1799 && cgraph_node::get (decl
)->instrumented_version
1800 && TREE_PUBLIC (cgraph_node::get (decl
)->instrumented_version
->decl
)))
1802 notice_global_symbol (decl
);
1804 globalize_decl (decl
);
1806 maybe_assemble_visibility (decl
);
1809 if (DECL_PRESERVE_P (decl
))
1810 targetm
.asm_out
.mark_decl_preserved (fnname
);
1812 /* Do any machine/system dependent processing of the function name. */
1813 #ifdef ASM_DECLARE_FUNCTION_NAME
1814 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1816 /* Standard thing is just output label for the function. */
1817 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1818 #endif /* ASM_DECLARE_FUNCTION_NAME */
1820 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1821 saw_no_split_stack
= true;
1824 /* Output assembler code associated with defining the size of the
1825 function. DECL describes the function. NAME is the function's name. */
1828 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1830 #ifdef ASM_DECLARE_FUNCTION_SIZE
1831 /* We could have switched section in the middle of the function. */
1832 if (flag_reorder_blocks_and_partition
)
1833 switch_to_section (function_section (decl
));
1834 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1836 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1838 output_constant_pool (fnname
, decl
);
1839 switch_to_section (function_section (decl
)); /* need to switch back */
1841 /* Output labels for end of hot/cold text sections (to be used by
1843 if (flag_reorder_blocks_and_partition
)
1845 section
*save_text_section
;
1847 save_text_section
= in_section
;
1848 switch_to_section (unlikely_text_section ());
1849 #ifdef ASM_DECLARE_COLD_FUNCTION_SIZE
1850 if (cold_function_name
!= NULL_TREE
)
1851 ASM_DECLARE_COLD_FUNCTION_SIZE (asm_out_file
,
1852 IDENTIFIER_POINTER (cold_function_name
),
1855 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1856 if (first_function_block_is_cold
)
1857 switch_to_section (text_section
);
1859 switch_to_section (function_section (decl
));
1860 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1861 switch_to_section (save_text_section
);
1865 /* Assemble code to leave SIZE bytes of zeros. */
1868 assemble_zeros (unsigned HOST_WIDE_INT size
)
1870 /* Do no output if -fsyntax-only. */
1871 if (flag_syntax_only
)
1874 #ifdef ASM_NO_SKIP_IN_TEXT
1875 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1876 so we must output 0s explicitly in the text section. */
1877 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1879 unsigned HOST_WIDE_INT i
;
1880 for (i
= 0; i
< size
; i
++)
1881 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1886 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1889 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1892 assemble_align (int align
)
1894 if (align
> BITS_PER_UNIT
)
1896 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1900 /* Assemble a string constant with the specified C string as contents. */
1903 assemble_string (const char *p
, int size
)
1908 /* If the string is very long, split it up. */
1912 int thissize
= size
- pos
;
1913 if (thissize
> maximum
)
1916 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1924 /* A noswitch_section_callback for lcomm_section. */
1927 emit_local (tree decl ATTRIBUTE_UNUSED
,
1928 const char *name ATTRIBUTE_UNUSED
,
1929 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1930 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1932 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1933 unsigned int align
= symtab_node::get (decl
)->definition_alignment ();
1934 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1937 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1938 unsigned int align
= symtab_node::get (decl
)->definition_alignment ();
1939 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, align
);
1942 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1947 /* A noswitch_section_callback for bss_noswitch_section. */
1949 #if defined ASM_OUTPUT_ALIGNED_BSS
1951 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1952 const char *name ATTRIBUTE_UNUSED
,
1953 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1954 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1956 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
,
1957 get_variable_align (decl
));
1962 /* A noswitch_section_callback for comm_section. */
1965 emit_common (tree decl ATTRIBUTE_UNUSED
,
1966 const char *name ATTRIBUTE_UNUSED
,
1967 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1968 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1970 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1971 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1972 size
, get_variable_align (decl
));
1974 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1975 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
,
1976 get_variable_align (decl
));
1979 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1984 /* A noswitch_section_callback for tls_comm_section. */
1987 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1988 const char *name ATTRIBUTE_UNUSED
,
1989 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1990 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1992 #ifdef ASM_OUTPUT_TLS_COMMON
1993 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
1996 sorry ("thread-local COMMON data not implemented");
2001 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
2002 NAME is the name of DECL's SYMBOL_REF. */
2005 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
,
2008 unsigned HOST_WIDE_INT size
, rounded
;
2010 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2013 if ((flag_sanitize
& SANITIZE_ADDRESS
) && asan_protect_global (decl
))
2014 size
+= asan_red_zone_size (size
);
2016 /* Don't allocate zero bytes of common,
2017 since that means "undefined external" in the linker. */
2021 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2022 so that each uninitialized object starts on such a boundary. */
2023 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
2024 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2025 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2027 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
2028 && (unsigned HOST_WIDE_INT
) (align
/ BITS_PER_UNIT
) > rounded
)
2029 error ("requested alignment for %q+D is greater than "
2030 "implemented alignment of %wu", decl
, rounded
);
2033 /* A subroutine of assemble_variable. Output the label and contents of
2034 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
2035 is as for assemble_variable. */
2038 assemble_variable_contents (tree decl
, const char *name
,
2039 bool dont_output_data
)
2041 /* Do any machine/system dependent processing of the object. */
2042 #ifdef ASM_DECLARE_OBJECT_NAME
2043 last_assemble_variable_decl
= decl
;
2044 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
2046 /* Standard thing is just output label for the object. */
2047 ASM_OUTPUT_LABEL (asm_out_file
, name
);
2048 #endif /* ASM_DECLARE_OBJECT_NAME */
2050 if (!dont_output_data
)
2052 /* Caller is supposed to use varpool_get_constructor when it wants
2053 to output the body. */
2054 gcc_assert (!in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
);
2055 if (DECL_INITIAL (decl
)
2056 && DECL_INITIAL (decl
) != error_mark_node
2057 && !initializer_zerop (DECL_INITIAL (decl
)))
2058 /* Output the actual data. */
2059 output_constant (DECL_INITIAL (decl
),
2060 tree_to_uhwi (DECL_SIZE_UNIT (decl
)),
2061 get_variable_align (decl
),
2064 /* Leave space for it. */
2065 assemble_zeros (tree_to_uhwi (DECL_SIZE_UNIT (decl
)));
2066 targetm
.asm_out
.decl_end ();
2070 /* Write out assembly for the variable DECL, which is not defined in
2071 the current translation unit. */
2073 assemble_undefined_decl (tree decl
)
2075 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
2076 targetm
.asm_out
.assemble_undefined_decl (asm_out_file
, name
, decl
);
2079 /* Assemble everything that is needed for a variable or function declaration.
2080 Not used for automatic variables, and not used for function definitions.
2081 Should not be called for variables of incomplete structure type.
2083 TOP_LEVEL is nonzero if this variable has file scope.
2084 AT_END is nonzero if this is the special handling, at end of compilation,
2085 to define things that have had only tentative definitions.
2086 DONT_OUTPUT_DATA if nonzero means don't actually output the
2087 initial value (that will be done by the caller). */
2090 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
2091 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
2094 rtx decl_rtl
, symbol
;
2097 bool asan_protected
= false;
2099 /* This function is supposed to handle VARIABLES. Ensure we have one. */
2100 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
2102 /* Emulated TLS had better not get this far. */
2103 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
2105 last_assemble_variable_decl
= 0;
2107 /* Normally no need to say anything here for external references,
2108 since assemble_external is called by the language-specific code
2109 when a declaration is first seen. */
2111 if (DECL_EXTERNAL (decl
))
2114 /* Do nothing for global register variables. */
2115 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
2117 TREE_ASM_WRITTEN (decl
) = 1;
2121 /* If type was incomplete when the variable was declared,
2122 see if it is complete now. */
2124 if (DECL_SIZE (decl
) == 0)
2125 layout_decl (decl
, 0);
2127 /* Still incomplete => don't allocate it; treat the tentative defn
2128 (which is what it must have been) as an `extern' reference. */
2130 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2132 error ("storage size of %q+D isn%'t known", decl
);
2133 TREE_ASM_WRITTEN (decl
) = 1;
2137 /* The first declaration of a variable that comes through this function
2138 decides whether it is global (in C, has external linkage)
2139 or local (in C, has internal linkage). So do nothing more
2140 if this function has already run. */
2142 if (TREE_ASM_WRITTEN (decl
))
2145 /* Make sure targetm.encode_section_info is invoked before we set
2147 decl_rtl
= DECL_RTL (decl
);
2149 TREE_ASM_WRITTEN (decl
) = 1;
2151 /* Do no output if -fsyntax-only. */
2152 if (flag_syntax_only
)
2155 if (! dont_output_data
2156 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
2158 error ("size of variable %q+D is too large", decl
);
2162 gcc_assert (MEM_P (decl_rtl
));
2163 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2164 symbol
= XEXP (decl_rtl
, 0);
2166 /* If this symbol belongs to the tree constant pool, output the constant
2167 if it hasn't already been written. */
2168 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
2170 tree decl
= SYMBOL_REF_DECL (symbol
);
2171 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
2172 output_constant_def_contents (symbol
);
2178 name
= XSTR (symbol
, 0);
2179 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2180 notice_global_symbol (decl
);
2182 /* Compute the alignment of this data. */
2184 align_variable (decl
, dont_output_data
);
2186 if ((flag_sanitize
& SANITIZE_ADDRESS
)
2187 && asan_protect_global (decl
))
2189 asan_protected
= true;
2190 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
2191 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
2194 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2196 align
= get_variable_align (decl
);
2198 if (TREE_PUBLIC (decl
))
2199 maybe_assemble_visibility (decl
);
2201 if (DECL_PRESERVE_P (decl
))
2202 targetm
.asm_out
.mark_decl_preserved (name
);
2204 /* First make the assembler name(s) global if appropriate. */
2205 sect
= get_variable_section (decl
, false);
2206 if (TREE_PUBLIC (decl
)
2207 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2208 globalize_decl (decl
);
2210 /* Output any data that we will need to use the address of. */
2211 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2212 output_addressed_constants (DECL_INITIAL (decl
));
2214 /* dbxout.c needs to know this. */
2215 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2216 DECL_IN_TEXT_SECTION (decl
) = 1;
2218 /* If the decl is part of an object_block, make sure that the decl
2219 has been positioned within its block, but do not write out its
2220 definition yet. output_object_blocks will do that later. */
2221 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2223 gcc_assert (!dont_output_data
);
2224 place_block_symbol (symbol
);
2226 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2227 assemble_noswitch_variable (decl
, name
, sect
, align
);
2230 /* Special-case handling of vtv comdat sections. */
2231 if (sect
->named
.name
2232 && (strcmp (sect
->named
.name
, ".vtable_map_vars") == 0))
2233 handle_vtv_comdat_section (sect
, decl
);
2235 switch_to_section (sect
);
2236 if (align
> BITS_PER_UNIT
)
2237 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
2238 assemble_variable_contents (decl
, name
, dont_output_data
);
2241 unsigned HOST_WIDE_INT
int size
2242 = tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2243 assemble_zeros (asan_red_zone_size (size
));
2249 /* Given a function declaration (FN_DECL), this function assembles the
2250 function into the .preinit_array section. */
2253 assemble_vtv_preinit_initializer (tree fn_decl
)
2256 unsigned flags
= SECTION_WRITE
;
2257 rtx symbol
= XEXP (DECL_RTL (fn_decl
), 0);
2259 flags
|= SECTION_NOTYPE
;
2260 sect
= get_section (".preinit_array", flags
, fn_decl
);
2261 switch_to_section (sect
);
2262 assemble_addr_to_section (symbol
, sect
);
2265 /* Return 1 if type TYPE contains any pointers. */
2268 contains_pointers_p (tree type
)
2270 switch (TREE_CODE (type
))
2273 case REFERENCE_TYPE
:
2274 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2275 so I'll play safe and return 1. */
2281 case QUAL_UNION_TYPE
:
2284 /* For a type that has fields, see if the fields have pointers. */
2285 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2286 if (TREE_CODE (fields
) == FIELD_DECL
2287 && contains_pointers_p (TREE_TYPE (fields
)))
2293 /* An array type contains pointers if its element type does. */
2294 return contains_pointers_p (TREE_TYPE (type
));
2301 /* We delay assemble_external processing until
2302 the compilation unit is finalized. This is the best we can do for
2303 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2304 it all the way to final. See PR 17982 for further discussion. */
2305 static GTY(()) tree pending_assemble_externals
;
2307 #ifdef ASM_OUTPUT_EXTERNAL
2308 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2309 As a result, assemble_external can be called after the list of externals
2310 is processed and the pointer set destroyed. */
2311 static bool pending_assemble_externals_processed
;
2313 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2314 TREE_LIST in assemble_external. */
2315 static hash_set
<tree
> *pending_assemble_externals_set
;
2317 /* True if DECL is a function decl for which no out-of-line copy exists.
2318 It is assumed that DECL's assembler name has been set. */
2321 incorporeal_function_p (tree decl
)
2323 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2327 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2328 && (DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
2329 || DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA_WITH_ALIGN
))
2332 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2333 /* Atomic or sync builtins which have survived this far will be
2334 resolved externally and therefore are not incorporeal. */
2335 if (strncmp (name
, "__builtin_", 10) == 0)
2341 /* Actually do the tests to determine if this is necessary, and invoke
2342 ASM_OUTPUT_EXTERNAL. */
2344 assemble_external_real (tree decl
)
2346 rtx rtl
= DECL_RTL (decl
);
2348 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2349 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2350 && !incorporeal_function_p (decl
))
2352 /* Some systems do require some output. */
2353 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2354 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2360 process_pending_assemble_externals (void)
2362 #ifdef ASM_OUTPUT_EXTERNAL
2364 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2365 assemble_external_real (TREE_VALUE (list
));
2367 pending_assemble_externals
= 0;
2368 pending_assemble_externals_processed
= true;
2369 delete pending_assemble_externals_set
;
2373 /* This TREE_LIST contains any weak symbol declarations waiting
2375 static GTY(()) tree weak_decls
;
2377 /* Output something to declare an external symbol to the assembler,
2378 and qualifiers such as weakness. (Most assemblers don't need
2379 extern declaration, so we normally output nothing.) Do nothing if
2380 DECL is not external. */
2383 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2385 /* Make sure that the ASM_OUT_FILE is open.
2386 If it's not, we should not be calling this function. */
2387 gcc_assert (asm_out_file
);
2389 /* In a perfect world, the following condition would be true.
2390 Sadly, the Java and Go front ends emit assembly *from the front end*,
2391 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2393 /* This function should only be called if we are expanding, or have
2395 Ideally, only final.c would be calling this function, but it is
2396 not clear whether that would break things somehow. See PR 17982
2397 for further discussion. */
2398 gcc_assert (state
== EXPANSION
2399 || state
== FINISHED
);
2402 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2405 /* We want to output annotation for weak and external symbols at
2406 very last to check if they are references or not. */
2408 if (TARGET_SUPPORTS_WEAK
2410 /* TREE_STATIC is a weird and abused creature which is not
2411 generally the right test for whether an entity has been
2412 locally emitted, inlined or otherwise not-really-extern, but
2413 for declarations that can be weak, it happens to be
2415 && !TREE_STATIC (decl
)
2416 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2417 && value_member (decl
, weak_decls
) == NULL_TREE
)
2418 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2420 #ifdef ASM_OUTPUT_EXTERNAL
2421 if (pending_assemble_externals_processed
)
2423 assemble_external_real (decl
);
2427 if (! pending_assemble_externals_set
->add (decl
))
2428 pending_assemble_externals
= tree_cons (NULL
, decl
,
2429 pending_assemble_externals
);
2433 /* Similar, for calling a library function FUN. */
2436 assemble_external_libcall (rtx fun
)
2438 /* Declare library function name external when first used, if nec. */
2439 if (! SYMBOL_REF_USED (fun
))
2441 SYMBOL_REF_USED (fun
) = 1;
2442 targetm
.asm_out
.external_libcall (fun
);
2446 /* Assemble a label named NAME. */
2449 assemble_label (FILE *file
, const char *name
)
2451 ASM_OUTPUT_LABEL (file
, name
);
2454 /* Set the symbol_referenced flag for ID. */
2456 mark_referenced (tree id
)
2458 TREE_SYMBOL_REFERENCED (id
) = 1;
2461 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2463 mark_decl_referenced (tree decl
)
2465 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2467 /* Extern inline functions don't become needed when referenced.
2468 If we know a method will be emitted in other TU and no new
2469 functions can be marked reachable, just use the external
2471 struct cgraph_node
*node
= cgraph_node::get_create (decl
);
2472 if (!DECL_EXTERNAL (decl
)
2473 && !node
->definition
)
2474 node
->mark_force_output ();
2476 else if (TREE_CODE (decl
) == VAR_DECL
)
2478 varpool_node
*node
= varpool_node::get_create (decl
);
2479 /* C++ frontend use mark_decl_references to force COMDAT variables
2480 to be output that might appear dead otherwise. */
2481 node
->force_output
= true;
2483 /* else do nothing - we can get various sorts of CST nodes here,
2484 which do not need to be marked. */
2488 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2489 starts with a *, the rest of NAME is output verbatim. Otherwise
2490 NAME is transformed in a target-specific way (usually by the
2491 addition of an underscore). */
2494 assemble_name_raw (FILE *file
, const char *name
)
2497 fputs (&name
[1], file
);
2499 ASM_OUTPUT_LABELREF (file
, name
);
2502 /* Like assemble_name_raw, but should be used when NAME might refer to
2503 an entity that is also represented as a tree (like a function or
2504 variable). If NAME does refer to such an entity, that entity will
2505 be marked as referenced. */
2508 assemble_name (FILE *file
, const char *name
)
2510 const char *real_name
;
2513 real_name
= targetm
.strip_name_encoding (name
);
2515 id
= maybe_get_identifier (real_name
);
2520 mark_referenced (id
);
2521 ultimate_transparent_alias_target (&id
);
2523 name
= IDENTIFIER_POINTER (id
);
2524 gcc_assert (! TREE_CHAIN (id
));
2527 assemble_name_raw (file
, name
);
2530 /* Allocate SIZE bytes writable static space with a gensym name
2531 and return an RTX to refer to its address. */
2534 assemble_static_space (unsigned HOST_WIDE_INT size
)
2537 const char *namestring
;
2540 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2542 namestring
= ggc_strdup (name
);
2544 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2545 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2547 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2548 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2551 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2552 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2555 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2556 so that each uninitialized object starts on such a boundary. */
2557 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2558 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2559 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2560 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2561 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2562 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2569 /* Assemble the static constant template for function entry trampolines.
2570 This is done at most once per compilation.
2571 Returns an RTX for the address of the template. */
2573 static GTY(()) rtx initial_trampoline
;
2576 assemble_trampoline_template (void)
2583 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2585 if (initial_trampoline
)
2586 return initial_trampoline
;
2588 /* By default, put trampoline templates in read-only data section. */
2590 #ifdef TRAMPOLINE_SECTION
2591 switch_to_section (TRAMPOLINE_SECTION
);
2593 switch_to_section (readonly_data_section
);
2596 /* Write the assembler code to define one. */
2597 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2599 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2601 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2602 targetm
.asm_out
.trampoline_template (asm_out_file
);
2604 /* Record the rtl to refer to it. */
2605 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2606 name
= ggc_strdup (label
);
2607 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2608 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2610 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2611 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2612 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2614 return initial_trampoline
;
2617 /* A and B are either alignments or offsets. Return the minimum alignment
2618 that may be assumed after adding the two together. */
2620 static inline unsigned
2621 min_align (unsigned int a
, unsigned int b
)
2623 return (a
| b
) & -(a
| b
);
2626 /* Return the assembler directive for creating a given kind of integer
2627 object. SIZE is the number of bytes in the object and ALIGNED_P
2628 indicates whether it is known to be aligned. Return NULL if the
2629 assembly dialect has no such directive.
2631 The returned string should be printed at the start of a new line and
2632 be followed immediately by the object's initial value. */
2635 integer_asm_op (int size
, int aligned_p
)
2637 struct asm_int_op
*ops
;
2640 ops
= &targetm
.asm_out
.aligned_op
;
2642 ops
= &targetm
.asm_out
.unaligned_op
;
2647 return targetm
.asm_out
.byte_op
;
2661 /* Use directive OP to assemble an integer object X. Print OP at the
2662 start of the line, followed immediately by the value of X. */
2665 assemble_integer_with_op (const char *op
, rtx x
)
2667 fputs (op
, asm_out_file
);
2668 output_addr_const (asm_out_file
, x
);
2669 fputc ('\n', asm_out_file
);
2672 /* The default implementation of the asm_out.integer target hook. */
2675 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2676 unsigned int size ATTRIBUTE_UNUSED
,
2677 int aligned_p ATTRIBUTE_UNUSED
)
2679 const char *op
= integer_asm_op (size
, aligned_p
);
2680 /* Avoid GAS bugs for large values. Specifically negative values whose
2681 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2682 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE_UNITS
)
2684 return op
&& (assemble_integer_with_op (op
, x
), true);
2687 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2688 the alignment of the integer in bits. Return 1 if we were able to output
2689 the constant, otherwise 0. We must be able to output the constant,
2690 if FORCE is nonzero. */
2693 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2697 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2699 /* See if the target hook can handle this kind of object. */
2700 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2703 /* If the object is a multi-byte one, try splitting it up. Split
2704 it into words it if is multi-word, otherwise split it into bytes. */
2707 machine_mode omode
, imode
;
2708 unsigned int subalign
;
2709 unsigned int subsize
, i
;
2710 enum mode_class mclass
;
2712 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2713 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2714 if (GET_CODE (x
) == CONST_FIXED
)
2715 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2719 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2720 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2722 for (i
= 0; i
< size
; i
+= subsize
)
2724 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2725 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2731 /* If we've printed some of it, but not all of it, there's no going
2736 gcc_assert (!force
);
2741 /* Assemble the floating-point constant D into an object of size MODE. ALIGN
2742 is the alignment of the constant in bits. If REVERSE is true, D is output
2743 in reverse storage order. */
2746 assemble_real (REAL_VALUE_TYPE d
, machine_mode mode
, unsigned int align
,
2749 long data
[4] = {0, 0, 0, 0};
2750 int bitsize
, nelts
, nunits
, units_per
;
2753 /* This is hairy. We have a quantity of known size. real_to_target
2754 will put it into an array of *host* longs, 32 bits per element
2755 (even if long is more than 32 bits). We need to determine the
2756 number of array elements that are occupied (nelts) and the number
2757 of *target* min-addressable units that will be occupied in the
2758 object file (nunits). We cannot assume that 32 divides the
2759 mode's bitsize (size * BITS_PER_UNIT) evenly.
2761 size * BITS_PER_UNIT is used here to make sure that padding bits
2762 (which might appear at either end of the value; real_to_target
2763 will include the padding bits in its output array) are included. */
2765 nunits
= GET_MODE_SIZE (mode
);
2766 bitsize
= nunits
* BITS_PER_UNIT
;
2767 nelts
= CEIL (bitsize
, 32);
2768 units_per
= 32 / BITS_PER_UNIT
;
2770 real_to_target (data
, &d
, mode
);
2772 /* Put out the first word with the specified alignment. */
2774 elt
= flip_storage_order (SImode
, gen_int_mode (data
[nelts
- 1], SImode
));
2776 elt
= GEN_INT (data
[0]);
2777 assemble_integer (elt
, MIN (nunits
, units_per
), align
, 1);
2778 nunits
-= units_per
;
2780 /* Subsequent words need only 32-bit alignment. */
2781 align
= min_align (align
, 32);
2783 for (int i
= 1; i
< nelts
; i
++)
2786 elt
= flip_storage_order (SImode
,
2787 gen_int_mode (data
[nelts
- 1 - i
], SImode
));
2789 elt
= GEN_INT (data
[i
]);
2790 assemble_integer (elt
, MIN (nunits
, units_per
), align
, 1);
2791 nunits
-= units_per
;
2795 /* Given an expression EXP with a constant value,
2796 reduce it to the sum of an assembler symbol and an integer.
2797 Store them both in the structure *VALUE.
2798 EXP must be reducible. */
2802 HOST_WIDE_INT offset
;
2806 decode_addr_const (tree exp
, struct addr_const
*value
)
2808 tree target
= TREE_OPERAND (exp
, 0);
2814 if (TREE_CODE (target
) == COMPONENT_REF
2815 && tree_fits_shwi_p (byte_position (TREE_OPERAND (target
, 1))))
2817 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2818 target
= TREE_OPERAND (target
, 0);
2820 else if (TREE_CODE (target
) == ARRAY_REF
2821 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2823 offset
+= (tree_to_uhwi (TYPE_SIZE_UNIT (TREE_TYPE (target
)))
2824 * tree_to_shwi (TREE_OPERAND (target
, 1)));
2825 target
= TREE_OPERAND (target
, 0);
2827 else if (TREE_CODE (target
) == MEM_REF
2828 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2830 offset
+= mem_ref_offset (target
).to_short_addr ();
2831 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2833 else if (TREE_CODE (target
) == INDIRECT_REF
2834 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2835 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2837 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2842 switch (TREE_CODE (target
))
2846 x
= DECL_RTL (target
);
2850 x
= gen_rtx_MEM (FUNCTION_MODE
,
2851 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2860 x
= output_constant_def (target
, 1);
2867 gcc_assert (MEM_P (x
));
2871 value
->offset
= offset
;
2874 static GTY(()) hash_table
<tree_descriptor_hasher
> *const_desc_htab
;
2876 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2878 /* Constant pool accessor function. */
2880 hash_table
<tree_descriptor_hasher
> *
2881 constant_pool_htab (void)
2883 return const_desc_htab
;
2886 /* Compute a hash code for a constant expression. */
2889 tree_descriptor_hasher::hash (constant_descriptor_tree
*ptr
)
2895 const_hash_1 (const tree exp
)
2900 enum tree_code code
= TREE_CODE (exp
);
2902 /* Either set P and LEN to the address and len of something to hash and
2903 exit the switch or return a value. */
2908 p
= (char *) &TREE_INT_CST_ELT (exp
, 0);
2909 len
= TREE_INT_CST_NUNITS (exp
) * sizeof (HOST_WIDE_INT
);
2913 return real_hash (TREE_REAL_CST_PTR (exp
));
2916 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2919 p
= TREE_STRING_POINTER (exp
);
2920 len
= TREE_STRING_LENGTH (exp
);
2924 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2925 + const_hash_1 (TREE_IMAGPART (exp
)));
2931 hi
= 7 + VECTOR_CST_NELTS (exp
);
2933 for (i
= 0; i
< VECTOR_CST_NELTS (exp
); ++i
)
2934 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ELT (exp
, i
));
2941 unsigned HOST_WIDE_INT idx
;
2944 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2946 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2948 hi
= hi
* 603 + const_hash_1 (value
);
2956 struct addr_const value
;
2958 decode_addr_const (exp
, &value
);
2959 switch (GET_CODE (value
.base
))
2962 /* Don't hash the address of the SYMBOL_REF;
2963 only use the offset and the symbol name. */
2965 p
= XSTR (value
.base
, 0);
2966 for (i
= 0; p
[i
] != 0; i
++)
2967 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2972 + CODE_LABEL_NUMBER (LABEL_REF_LABEL (value
.base
)) * 13);
2982 case POINTER_PLUS_EXPR
:
2984 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2985 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2988 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2991 /* A language specific constant. Just hash the code. */
2995 /* Compute hashing function. */
2997 for (i
= 0; i
< len
; i
++)
2998 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3003 /* Wrapper of compare_constant, for the htab interface. */
3005 tree_descriptor_hasher::equal (constant_descriptor_tree
*c1
,
3006 constant_descriptor_tree
*c2
)
3008 if (c1
->hash
!= c2
->hash
)
3010 return compare_constant (c1
->value
, c2
->value
);
3013 /* Compare t1 and t2, and return 1 only if they are known to result in
3014 the same bit pattern on output. */
3017 compare_constant (const tree t1
, const tree t2
)
3019 enum tree_code typecode
;
3021 if (t1
== NULL_TREE
)
3022 return t2
== NULL_TREE
;
3023 if (t2
== NULL_TREE
)
3026 if (TREE_CODE (t1
) != TREE_CODE (t2
))
3029 switch (TREE_CODE (t1
))
3032 /* Integer constants are the same only if the same width of type. */
3033 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3035 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3037 return tree_int_cst_equal (t1
, t2
);
3040 /* Real constants are the same only if the same width of type. */
3041 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3044 return real_identical (&TREE_REAL_CST (t1
), &TREE_REAL_CST (t2
));
3047 /* Fixed constants are the same only if the same width of type. */
3048 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3051 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
3054 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3057 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
3058 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
3059 TREE_STRING_LENGTH (t1
)));
3062 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
3063 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
3069 if (VECTOR_CST_NELTS (t1
) != VECTOR_CST_NELTS (t2
))
3072 for (i
= 0; i
< VECTOR_CST_NELTS (t1
); ++i
)
3073 if (!compare_constant (VECTOR_CST_ELT (t1
, i
),
3074 VECTOR_CST_ELT (t2
, i
)))
3082 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
3083 unsigned HOST_WIDE_INT idx
;
3085 typecode
= TREE_CODE (TREE_TYPE (t1
));
3086 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
3089 if (typecode
== ARRAY_TYPE
)
3091 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
3092 /* For arrays, check that mode, size and storage order match. */
3093 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
3095 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
))
3096 || TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (t1
))
3097 != TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (t2
)))
3102 /* For record and union constructors, require exact type
3104 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
3108 v1
= CONSTRUCTOR_ELTS (t1
);
3109 v2
= CONSTRUCTOR_ELTS (t2
);
3110 if (vec_safe_length (v1
) != vec_safe_length (v2
))
3113 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
3115 constructor_elt
*c1
= &(*v1
)[idx
];
3116 constructor_elt
*c2
= &(*v2
)[idx
];
3118 /* Check that each value is the same... */
3119 if (!compare_constant (c1
->value
, c2
->value
))
3121 /* ... and that they apply to the same fields! */
3122 if (typecode
== ARRAY_TYPE
)
3124 if (!compare_constant (c1
->index
, c2
->index
))
3129 if (c1
->index
!= c2
->index
)
3140 struct addr_const value1
, value2
;
3144 decode_addr_const (t1
, &value1
);
3145 decode_addr_const (t2
, &value2
);
3147 if (value1
.offset
!= value2
.offset
)
3150 code
= GET_CODE (value1
.base
);
3151 if (code
!= GET_CODE (value2
.base
))
3157 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3161 ret
= (CODE_LABEL_NUMBER (LABEL_REF_LABEL (value1
.base
))
3162 == CODE_LABEL_NUMBER (LABEL_REF_LABEL (value2
.base
)));
3172 case POINTER_PLUS_EXPR
:
3175 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3176 && compare_constant (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3179 case VIEW_CONVERT_EXPR
:
3180 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3189 /* Return the section into which constant EXP should be placed. */
3192 get_constant_section (tree exp
, unsigned int align
)
3194 return targetm
.asm_out
.select_section (exp
,
3195 compute_reloc_for_constant (exp
),
3199 /* Return the size of constant EXP in bytes. */
3201 static HOST_WIDE_INT
3202 get_constant_size (tree exp
)
3206 size
= int_size_in_bytes (TREE_TYPE (exp
));
3207 if (TREE_CODE (exp
) == STRING_CST
)
3208 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3212 /* Subroutine of output_constant_def:
3213 No constant equal to EXP is known to have been output.
3214 Make a constant descriptor to enter EXP in the hash table.
3215 Assign the label number and construct RTL to refer to the
3216 constant's location in memory.
3217 Caller is responsible for updating the hash table. */
3219 static struct constant_descriptor_tree
*
3220 build_constant_desc (tree exp
)
3222 struct constant_descriptor_tree
*desc
;
3228 desc
= ggc_alloc
<constant_descriptor_tree
> ();
3231 /* Create a string containing the label name, in LABEL. */
3232 labelno
= const_labelno
++;
3233 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3235 /* Construct the VAR_DECL associated with the constant. */
3236 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3238 DECL_ARTIFICIAL (decl
) = 1;
3239 DECL_IGNORED_P (decl
) = 1;
3240 TREE_READONLY (decl
) = 1;
3241 TREE_STATIC (decl
) = 1;
3242 TREE_ADDRESSABLE (decl
) = 1;
3243 /* We don't set the RTL yet as this would cause varpool to assume that the
3244 variable is referenced. Moreover, it would just be dropped in LTO mode.
3245 Instead we set the flag that will be recognized in make_decl_rtl. */
3246 DECL_IN_CONSTANT_POOL (decl
) = 1;
3247 DECL_INITIAL (decl
) = desc
->value
;
3248 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3249 architectures so use DATA_ALIGNMENT as well, except for strings. */
3250 if (TREE_CODE (exp
) == STRING_CST
)
3252 DECL_ALIGN (decl
) = CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
));
3255 align_variable (decl
, 0);
3257 /* Now construct the SYMBOL_REF and the MEM. */
3258 if (use_object_blocks_p ())
3260 int align
= (TREE_CODE (decl
) == CONST_DECL
3261 || (TREE_CODE (decl
) == VAR_DECL
3262 && DECL_IN_CONSTANT_POOL (decl
))
3264 : symtab_node::get (decl
)->definition_alignment ());
3265 section
*sect
= get_constant_section (exp
, align
);
3266 symbol
= create_block_symbol (ggc_strdup (label
),
3267 get_block_for_section (sect
), -1);
3270 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3271 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3272 SET_SYMBOL_REF_DECL (symbol
, decl
);
3273 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3275 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3276 set_mem_attributes (rtl
, exp
, 1);
3277 set_mem_alias_set (rtl
, 0);
3279 /* We cannot share RTX'es in pool entries.
3280 Mark this piece of RTL as required for unsharing. */
3281 RTX_FLAG (rtl
, used
) = 1;
3283 /* Set flags or add text to the name to record information, such as
3284 that it is a local symbol. If the name is changed, the macro
3285 ASM_OUTPUT_LABELREF will have to know how to strip this
3286 information. This call might invalidate our local variable
3287 SYMBOL; we can't use it afterward. */
3288 targetm
.encode_section_info (exp
, rtl
, true);
3295 /* Return an rtx representing a reference to constant data in memory
3296 for the constant expression EXP.
3298 If assembler code for such a constant has already been output,
3299 return an rtx to refer to it.
3300 Otherwise, output such a constant in memory
3301 and generate an rtx for it.
3303 If DEFER is nonzero, this constant can be deferred and output only
3304 if referenced in the function after all optimizations.
3306 `const_desc_table' records which constants already have label strings. */
3309 output_constant_def (tree exp
, int defer
)
3311 struct constant_descriptor_tree
*desc
;
3312 struct constant_descriptor_tree key
;
3314 /* Look up EXP in the table of constant descriptors. If we didn't find
3315 it, create a new one. */
3317 key
.hash
= const_hash_1 (exp
);
3318 constant_descriptor_tree
**loc
3319 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3324 desc
= build_constant_desc (exp
);
3325 desc
->hash
= key
.hash
;
3329 maybe_output_constant_def_contents (desc
, defer
);
3333 /* Subroutine of output_constant_def: Decide whether or not we need to
3334 output the constant DESC now, and if so, do it. */
3336 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3339 rtx symbol
= XEXP (desc
->rtl
, 0);
3340 tree exp
= desc
->value
;
3342 if (flag_syntax_only
)
3345 if (TREE_ASM_WRITTEN (exp
))
3346 /* Already output; don't do it again. */
3349 /* We can always defer constants as long as the context allows
3353 /* Increment n_deferred_constants if it exists. It needs to be at
3354 least as large as the number of constants actually referred to
3355 by the function. If it's too small we'll stop looking too early
3356 and fail to emit constants; if it's too large we'll only look
3357 through the entire function when we could have stopped earlier. */
3359 n_deferred_constants
++;
3363 output_constant_def_contents (symbol
);
3366 /* Subroutine of output_constant_def_contents. Output the definition
3367 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3368 constant's alignment in bits. */
3371 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3375 size
= get_constant_size (exp
);
3377 /* Do any machine/system dependent processing of the constant. */
3378 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3380 /* Output the value of EXP. */
3381 output_constant (exp
, size
, align
, false);
3383 targetm
.asm_out
.decl_end ();
3386 /* We must output the constant data referred to by SYMBOL; do so. */
3389 output_constant_def_contents (rtx symbol
)
3391 tree decl
= SYMBOL_REF_DECL (symbol
);
3392 tree exp
= DECL_INITIAL (decl
);
3393 bool asan_protected
= false;
3395 /* Make sure any other constants whose addresses appear in EXP
3396 are assigned label numbers. */
3397 output_addressed_constants (exp
);
3399 /* We are no longer deferring this constant. */
3400 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3402 if ((flag_sanitize
& SANITIZE_ADDRESS
)
3403 && TREE_CODE (exp
) == STRING_CST
3404 && asan_protect_global (exp
))
3406 asan_protected
= true;
3407 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
3408 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
3411 /* If the constant is part of an object block, make sure that the
3412 decl has been positioned within its block, but do not write out
3413 its definition yet. output_object_blocks will do that later. */
3414 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3415 place_block_symbol (symbol
);
3418 int align
= (TREE_CODE (decl
) == CONST_DECL
3419 || (TREE_CODE (decl
) == VAR_DECL
3420 && DECL_IN_CONSTANT_POOL (decl
))
3422 : symtab_node::get (decl
)->definition_alignment ());
3423 switch_to_section (get_constant_section (exp
, align
));
3424 if (align
> BITS_PER_UNIT
)
3425 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3426 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3429 HOST_WIDE_INT size
= get_constant_size (exp
);
3430 assemble_zeros (asan_red_zone_size (size
));
3435 /* Look up EXP in the table of constant descriptors. Return the rtl
3436 if it has been emitted, else null. */
3439 lookup_constant_def (tree exp
)
3441 struct constant_descriptor_tree key
;
3444 key
.hash
= const_hash_1 (exp
);
3445 constant_descriptor_tree
*desc
3446 = const_desc_htab
->find_with_hash (&key
, key
.hash
);
3448 return (desc
? desc
->rtl
: NULL_RTX
);
3451 /* Return a tree representing a reference to constant data in memory
3452 for the constant expression EXP.
3454 This is the counterpart of output_constant_def at the Tree level. */
3457 tree_output_constant_def (tree exp
)
3459 struct constant_descriptor_tree
*desc
, key
;
3462 /* Look up EXP in the table of constant descriptors. If we didn't find
3463 it, create a new one. */
3465 key
.hash
= const_hash_1 (exp
);
3466 constant_descriptor_tree
**loc
3467 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3472 desc
= build_constant_desc (exp
);
3473 desc
->hash
= key
.hash
;
3477 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3478 varpool_node::finalize_decl (decl
);
3482 struct GTY((chain_next ("%h.next"), for_user
)) constant_descriptor_rtx
{
3483 struct constant_descriptor_rtx
*next
;
3487 HOST_WIDE_INT offset
;
3495 struct const_rtx_desc_hasher
: ggc_ptr_hash
<constant_descriptor_rtx
>
3497 static hashval_t
hash (constant_descriptor_rtx
*);
3498 static bool equal (constant_descriptor_rtx
*, constant_descriptor_rtx
*);
3501 /* Used in the hash tables to avoid outputting the same constant
3502 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3503 are output once per function, not once per file. */
3504 /* ??? Only a few targets need per-function constant pools. Most
3505 can use one per-file pool. Should add a targetm bit to tell the
3508 struct GTY(()) rtx_constant_pool
{
3509 /* Pointers to first and last constant in pool, as ordered by offset. */
3510 struct constant_descriptor_rtx
*first
;
3511 struct constant_descriptor_rtx
*last
;
3513 /* Hash facility for making memory-constants from constant rtl-expressions.
3514 It is used on RISC machines where immediate integer arguments and
3515 constant addresses are restricted so that such constants must be stored
3517 hash_table
<const_rtx_desc_hasher
> *const_rtx_htab
;
3519 /* Current offset in constant pool (does not include any
3520 machine-specific header). */
3521 HOST_WIDE_INT offset
;
3524 /* Hash and compare functions for const_rtx_htab. */
3527 const_rtx_desc_hasher::hash (constant_descriptor_rtx
*desc
)
3533 const_rtx_desc_hasher::equal (constant_descriptor_rtx
*x
,
3534 constant_descriptor_rtx
*y
)
3536 if (x
->mode
!= y
->mode
)
3538 return rtx_equal_p (x
->constant
, y
->constant
);
3541 /* Hash one component of a constant. */
3544 const_rtx_hash_1 (const_rtx x
)
3546 unsigned HOST_WIDE_INT hwi
;
3552 code
= GET_CODE (x
);
3553 mode
= GET_MODE (x
);
3554 h
= (hashval_t
) code
* 1048573 + mode
;
3563 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3564 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3566 h
^= (hashval_t
) hwi
;
3567 for (i
= 1; i
< n
; ++i
)
3570 h
^= (hashval_t
) hwi
;
3575 case CONST_WIDE_INT
:
3576 hwi
= GET_MODE_PRECISION (mode
);
3578 for (i
= 0; i
< CONST_WIDE_INT_NUNITS (x
); i
++)
3579 hwi
^= CONST_WIDE_INT_ELT (x
, i
);
3584 if (TARGET_SUPPORTS_WIDE_INT
== 0 && mode
== VOIDmode
)
3586 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3590 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3594 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3598 h
^= htab_hash_string (XSTR (x
, 0));
3602 h
= h
* 251 + CODE_LABEL_NUMBER (LABEL_REF_LABEL (x
));
3606 case UNSPEC_VOLATILE
:
3607 h
= h
* 251 + XINT (x
, 1);
3617 /* Compute a hash value for X, which should be a constant. */
3620 const_rtx_hash (rtx x
)
3623 subrtx_iterator::array_type array
;
3624 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
3625 h
= h
* 509 + const_rtx_hash_1 (*iter
);
3630 /* Create and return a new rtx constant pool. */
3632 static struct rtx_constant_pool
*
3633 create_constant_pool (void)
3635 struct rtx_constant_pool
*pool
;
3637 pool
= ggc_alloc
<rtx_constant_pool
> ();
3638 pool
->const_rtx_htab
= hash_table
<const_rtx_desc_hasher
>::create_ggc (31);
3645 /* Initialize constant pool hashing for a new function. */
3648 init_varasm_status (void)
3650 crtl
->varasm
.pool
= create_constant_pool ();
3651 crtl
->varasm
.deferred_constants
= 0;
3654 /* Given a MINUS expression, simplify it if both sides
3655 include the same symbol. */
3658 simplify_subtraction (rtx x
)
3660 rtx r
= simplify_rtx (x
);
3664 /* Given a constant rtx X, make (or find) a memory constant for its value
3665 and return a MEM rtx to refer to it in memory. */
3668 force_const_mem (machine_mode mode
, rtx x
)
3670 struct constant_descriptor_rtx
*desc
, tmp
;
3671 struct rtx_constant_pool
*pool
;
3676 constant_descriptor_rtx
**slot
;
3678 /* If we're not allowed to drop X into the constant pool, don't. */
3679 if (targetm
.cannot_force_const_mem (mode
, x
))
3682 /* Record that this function has used a constant pool entry. */
3683 crtl
->uses_const_pool
= 1;
3685 /* Decide which pool to use. */
3686 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3687 ? shared_constant_pool
3688 : crtl
->varasm
.pool
);
3690 /* Lookup the value in the hashtable. */
3693 hash
= const_rtx_hash (x
);
3694 slot
= pool
->const_rtx_htab
->find_slot_with_hash (&tmp
, hash
, INSERT
);
3697 /* If the constant was already present, return its memory. */
3699 return copy_rtx (desc
->mem
);
3701 /* Otherwise, create a new descriptor. */
3702 desc
= ggc_alloc
<constant_descriptor_rtx
> ();
3705 /* Align the location counter as required by EXP's data type. */
3706 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3708 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3709 if (type
!= NULL_TREE
)
3710 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3712 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3713 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3716 desc
->constant
= copy_rtx (tmp
.constant
);
3717 desc
->offset
= pool
->offset
;
3720 desc
->align
= align
;
3721 desc
->labelno
= const_labelno
;
3724 pool
->offset
+= GET_MODE_SIZE (mode
);
3726 pool
->last
->next
= desc
;
3728 pool
->first
= pool
->last
= desc
;
3731 /* Create a string containing the label name, in LABEL. */
3732 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3735 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3736 the constants pool. */
3737 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3739 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3740 symbol
= create_block_symbol (ggc_strdup (label
),
3741 get_block_for_section (sect
), -1);
3744 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3746 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3747 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3748 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3750 /* Construct the MEM. */
3751 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3752 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3753 set_mem_align (def
, align
);
3755 /* If we're dropping a label to the constant pool, make sure we
3757 if (GET_CODE (x
) == LABEL_REF
)
3758 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3760 return copy_rtx (def
);
3763 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3766 get_pool_constant (const_rtx addr
)
3768 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3771 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3772 and whether it has been output or not. */
3775 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3777 struct constant_descriptor_rtx
*desc
;
3779 desc
= SYMBOL_REF_CONSTANT (addr
);
3780 *pmarked
= (desc
->mark
!= 0);
3781 return desc
->constant
;
3784 /* Similar, return the mode. */
3787 get_pool_mode (const_rtx addr
)
3789 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3792 /* Return the size of the constant pool. */
3795 get_pool_size (void)
3797 return crtl
->varasm
.pool
->offset
;
3800 /* Worker function for output_constant_pool_1. Emit assembly for X
3801 in MODE with known alignment ALIGN. */
3804 output_constant_pool_2 (machine_mode mode
, rtx x
, unsigned int align
)
3806 switch (GET_MODE_CLASS (mode
))
3809 case MODE_DECIMAL_FLOAT
:
3811 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3812 assemble_real (*CONST_DOUBLE_REAL_VALUE (x
), mode
, align
, false);
3817 case MODE_PARTIAL_INT
:
3822 case MODE_POINTER_BOUNDS
:
3823 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3826 case MODE_VECTOR_FLOAT
:
3827 case MODE_VECTOR_INT
:
3828 case MODE_VECTOR_FRACT
:
3829 case MODE_VECTOR_UFRACT
:
3830 case MODE_VECTOR_ACCUM
:
3831 case MODE_VECTOR_UACCUM
:
3834 machine_mode submode
= GET_MODE_INNER (mode
);
3835 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3837 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3838 units
= CONST_VECTOR_NUNITS (x
);
3840 for (i
= 0; i
< units
; i
++)
3842 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3843 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3853 /* Worker function for output_constant_pool. Emit constant DESC,
3854 giving it ALIGN bits of alignment. */
3857 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3864 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3865 whose CODE_LABEL has been deleted. This can occur if a jump table
3866 is eliminated by optimization. If so, write a constant of zero
3867 instead. Note that this can also happen by turning the
3868 CODE_LABEL into a NOTE. */
3869 /* ??? This seems completely and utterly wrong. Certainly it's
3870 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3871 functioning even with rtx_insn::deleted and friends. */
3874 switch (GET_CODE (tmp
))
3877 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3878 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3880 tmp
= XEXP (XEXP (tmp
, 0), 0);
3884 tmp
= LABEL_REF_LABEL (tmp
);
3885 gcc_assert (!as_a
<rtx_insn
*> (tmp
)->deleted ());
3886 gcc_assert (!NOTE_P (tmp
)
3887 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3894 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3895 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3896 align
, desc
->labelno
, done
);
3899 assemble_align (align
);
3901 /* Output the label. */
3902 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3905 Pass actual alignment value while emitting string constant to asm code
3906 as function 'output_constant_pool_1' explicitly passes the alignment as 1
3907 assuming that the data is already aligned which prevents the generation
3908 of fix-up table entries. */
3909 output_constant_pool_2 (desc
->mode
, x
, desc
->align
);
3911 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3912 sections have proper size. */
3913 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3915 && (in_section
->common
.flags
& SECTION_MERGE
))
3916 assemble_align (align
);
3918 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3924 /* Mark all constants that are referenced by SYMBOL_REFs in X.
3925 Emit referenced deferred strings. */
3928 mark_constants_in_pattern (rtx insn
)
3930 subrtx_iterator::array_type array
;
3931 FOR_EACH_SUBRTX (iter
, array
, PATTERN (insn
), ALL
)
3933 const_rtx x
= *iter
;
3934 if (GET_CODE (x
) == SYMBOL_REF
)
3936 if (CONSTANT_POOL_ADDRESS_P (x
))
3938 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3939 if (desc
->mark
== 0)
3942 iter
.substitute (desc
->constant
);
3945 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3947 tree decl
= SYMBOL_REF_DECL (x
);
3948 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
3950 n_deferred_constants
--;
3951 output_constant_def_contents (CONST_CAST_RTX (x
));
3958 /* Look through appropriate parts of INSN, marking all entries in the
3959 constant pool which are actually being used. Entries that are only
3960 referenced by other constants are also marked as used. Emit
3961 deferred strings that are used. */
3964 mark_constants (rtx_insn
*insn
)
3969 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3970 insns, not any notes that may be attached. We don't want to mark
3971 a constant just because it happens to appear in a REG_EQUIV note. */
3972 if (rtx_sequence
*seq
= dyn_cast
<rtx_sequence
*> (PATTERN (insn
)))
3974 int i
, n
= seq
->len ();
3975 for (i
= 0; i
< n
; ++i
)
3977 rtx subinsn
= seq
->element (i
);
3978 if (INSN_P (subinsn
))
3979 mark_constants_in_pattern (subinsn
);
3983 mark_constants_in_pattern (insn
);
3986 /* Look through the instructions for this function, and mark all the
3987 entries in POOL which are actually being used. Emit deferred constants
3988 which have indeed been used. */
3991 mark_constant_pool (void)
3995 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
3998 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3999 mark_constants (insn
);
4002 /* Write all the constants in POOL. */
4005 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
4007 struct constant_descriptor_rtx
*desc
;
4009 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
4012 /* If the constant is part of an object_block, make sure that
4013 the constant has been positioned within its block, but do not
4014 write out its definition yet. output_object_blocks will do
4016 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
4017 && SYMBOL_REF_BLOCK (desc
->sym
))
4018 place_block_symbol (desc
->sym
);
4021 switch_to_section (targetm
.asm_out
.select_rtx_section
4022 (desc
->mode
, desc
->constant
, desc
->align
));
4023 output_constant_pool_1 (desc
, desc
->align
);
4028 /* Mark all constants that are used in the current function, then write
4029 out the function's private constant pool. */
4032 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
4033 tree fndecl ATTRIBUTE_UNUSED
)
4035 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
4037 /* It is possible for gcc to call force_const_mem and then to later
4038 discard the instructions which refer to the constant. In such a
4039 case we do not need to output the constant. */
4040 mark_constant_pool ();
4042 #ifdef ASM_OUTPUT_POOL_PROLOGUE
4043 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4046 output_constant_pool_contents (pool
);
4048 #ifdef ASM_OUTPUT_POOL_EPILOGUE
4049 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4053 /* Write the contents of the shared constant pool. */
4056 output_shared_constant_pool (void)
4058 output_constant_pool_contents (shared_constant_pool
);
4061 /* Determine what kind of relocations EXP may need. */
4064 compute_reloc_for_constant (tree exp
)
4066 int reloc
= 0, reloc2
;
4069 switch (TREE_CODE (exp
))
4073 /* Go inside any operations that get_inner_reference can handle and see
4074 if what's inside is a constant: no need to do anything here for
4075 addresses of variables or functions. */
4076 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4077 tem
= TREE_OPERAND (tem
, 0))
4080 if (TREE_CODE (tem
) == MEM_REF
4081 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
4083 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
4087 if (!targetm
.binds_local_p (tem
))
4094 case POINTER_PLUS_EXPR
:
4095 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4096 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4100 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4101 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4102 /* The difference of two local labels is computable at link time. */
4103 if (reloc
== 1 && reloc2
== 1)
4110 case VIEW_CONVERT_EXPR
:
4111 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4116 unsigned HOST_WIDE_INT idx
;
4117 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4119 reloc
|= compute_reloc_for_constant (tem
);
4129 /* Find all the constants whose addresses are referenced inside of EXP,
4130 and make sure assembler code with a label has been output for each one.
4131 Indicate whether an ADDR_EXPR has been encountered. */
4134 output_addressed_constants (tree exp
)
4138 switch (TREE_CODE (exp
))
4142 /* Go inside any operations that get_inner_reference can handle and see
4143 if what's inside is a constant: no need to do anything here for
4144 addresses of variables or functions. */
4145 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4146 tem
= TREE_OPERAND (tem
, 0))
4149 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4150 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4151 tem
= DECL_INITIAL (tem
);
4153 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4154 output_constant_def (tem
, 0);
4156 if (TREE_CODE (tem
) == MEM_REF
)
4157 output_addressed_constants (TREE_OPERAND (tem
, 0));
4161 case POINTER_PLUS_EXPR
:
4163 output_addressed_constants (TREE_OPERAND (exp
, 1));
4167 case VIEW_CONVERT_EXPR
:
4168 output_addressed_constants (TREE_OPERAND (exp
, 0));
4173 unsigned HOST_WIDE_INT idx
;
4174 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4176 output_addressed_constants (tem
);
4185 /* Whether a constructor CTOR is a valid static constant initializer if all
4186 its elements are. This used to be internal to initializer_constant_valid_p
4187 and has been exposed to let other functions like categorize_ctor_elements
4188 evaluate the property while walking a constructor for other purposes. */
4191 constructor_static_from_elts_p (const_tree ctor
)
4193 return (TREE_CONSTANT (ctor
)
4194 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4195 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4196 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4199 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4202 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4203 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4204 which are valid when ENDTYPE is an integer of any size; in
4205 particular, this does not accept a pointer minus a constant. This
4206 returns null_pointer_node if the VALUE is an absolute constant
4207 which can be used to initialize a static variable. Otherwise it
4211 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4215 if (!INTEGRAL_TYPE_P (endtype
))
4218 op0
= TREE_OPERAND (value
, 0);
4219 op1
= TREE_OPERAND (value
, 1);
4221 /* Like STRIP_NOPS except allow the operand mode to widen. This
4222 works around a feature of fold that simplifies (int)(p1 - p2) to
4223 ((int)p1 - (int)p2) under the theory that the narrower operation
4226 while (CONVERT_EXPR_P (op0
)
4227 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4229 tree inner
= TREE_OPERAND (op0
, 0);
4230 if (inner
== error_mark_node
4231 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4232 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4233 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4238 while (CONVERT_EXPR_P (op1
)
4239 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4241 tree inner
= TREE_OPERAND (op1
, 0);
4242 if (inner
== error_mark_node
4243 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4244 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4245 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4250 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4254 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4255 cache
? cache
+ 2 : NULL
);
4256 /* Both initializers must be known. */
4260 && (op0
== null_pointer_node
4261 || TREE_CODE (value
) == MINUS_EXPR
))
4262 return null_pointer_node
;
4264 /* Support differences between labels. */
4265 if (TREE_CODE (op0
) == LABEL_DECL
4266 && TREE_CODE (op1
) == LABEL_DECL
)
4267 return null_pointer_node
;
4269 if (TREE_CODE (op0
) == STRING_CST
4270 && TREE_CODE (op1
) == STRING_CST
4271 && operand_equal_p (op0
, op1
, 1))
4272 return null_pointer_node
;
4278 /* Helper function of initializer_constant_valid_p.
4279 Return nonzero if VALUE is a valid constant-valued expression
4280 for use in initializing a static variable; one that can be an
4281 element of a "constant" initializer.
4283 Return null_pointer_node if the value is absolute;
4284 if it is relocatable, return the variable that determines the relocation.
4285 We assume that VALUE has been folded as much as possible;
4286 therefore, we do not need to check for such things as
4287 arithmetic-combinations of integers.
4289 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4292 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4296 switch (TREE_CODE (value
))
4299 if (constructor_static_from_elts_p (value
))
4301 unsigned HOST_WIDE_INT idx
;
4303 bool absolute
= true;
4305 if (cache
&& cache
[0] == value
)
4307 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4310 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4313 /* An absolute value is required with reverse SSO. */
4314 || (reloc
!= null_pointer_node
4315 && TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (value
))
4316 && !AGGREGATE_TYPE_P (TREE_TYPE (elt
))))
4321 cache
[1] = NULL_TREE
;
4325 if (reloc
!= null_pointer_node
)
4328 /* For a non-absolute relocation, there is no single
4329 variable that can be "the variable that determines the
4334 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4336 return absolute
? null_pointer_node
: error_mark_node
;
4339 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4347 return null_pointer_node
;
4352 tree op0
= staticp (TREE_OPERAND (value
, 0));
4355 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4356 to be a constant, this is old-skool offsetof-like nonsense. */
4357 if (TREE_CODE (op0
) == INDIRECT_REF
4358 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4359 return null_pointer_node
;
4360 /* Taking the address of a nested function involves a trampoline,
4361 unless we don't need or want one. */
4362 if (TREE_CODE (op0
) == FUNCTION_DECL
4363 && DECL_STATIC_CHAIN (op0
)
4364 && !TREE_NO_TRAMPOLINE (value
))
4366 /* "&{...}" requires a temporary to hold the constructed
4368 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4374 case NON_LVALUE_EXPR
:
4375 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4378 case VIEW_CONVERT_EXPR
:
4380 tree src
= TREE_OPERAND (value
, 0);
4381 tree src_type
= TREE_TYPE (src
);
4382 tree dest_type
= TREE_TYPE (value
);
4384 /* Allow view-conversions from aggregate to non-aggregate type only
4385 if the bit pattern is fully preserved afterwards; otherwise, the
4386 RTL expander won't be able to apply a subsequent transformation
4387 to the underlying constructor. */
4388 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4390 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4391 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4396 /* Allow all other kinds of view-conversion. */
4397 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4402 tree src
= TREE_OPERAND (value
, 0);
4403 tree src_type
= TREE_TYPE (src
);
4404 tree dest_type
= TREE_TYPE (value
);
4406 /* Allow conversions between pointer types, floating-point
4407 types, and offset types. */
4408 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4409 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4410 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4411 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4412 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4414 /* Allow length-preserving conversions between integer types. */
4415 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4416 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4417 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4419 /* Allow conversions between other integer types only if
4421 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4423 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4424 if (inner
== null_pointer_node
)
4425 return null_pointer_node
;
4429 /* Allow (int) &foo provided int is as wide as a pointer. */
4430 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4431 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4432 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4434 /* Likewise conversions from int to pointers, but also allow
4435 conversions from 0. */
4436 if ((POINTER_TYPE_P (dest_type
)
4437 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4438 && INTEGRAL_TYPE_P (src_type
))
4440 if (TREE_CODE (src
) == INTEGER_CST
4441 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4442 return null_pointer_node
;
4443 if (integer_zerop (src
))
4444 return null_pointer_node
;
4445 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4446 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4449 /* Allow conversions to struct or union types if the value
4451 if (TREE_CODE (dest_type
) == RECORD_TYPE
4452 || TREE_CODE (dest_type
) == UNION_TYPE
)
4453 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4457 case POINTER_PLUS_EXPR
:
4459 /* Any valid floating-point constants will have been folded by now;
4460 with -frounding-math we hit this with addition of two constants. */
4461 if (TREE_CODE (endtype
) == REAL_TYPE
)
4463 if (cache
&& cache
[0] == value
)
4465 if (! INTEGRAL_TYPE_P (endtype
)
4466 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4468 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4470 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4473 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4474 endtype
, ncache
+ 2);
4475 /* If either term is absolute, use the other term's relocation. */
4476 if (valid0
== null_pointer_node
)
4478 else if (valid1
== null_pointer_node
)
4480 /* Support narrowing pointer differences. */
4482 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4486 /* Support narrowing pointer differences. */
4487 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4496 if (TREE_CODE (endtype
) == REAL_TYPE
)
4498 if (cache
&& cache
[0] == value
)
4500 if (! INTEGRAL_TYPE_P (endtype
)
4501 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4503 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4505 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4508 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4509 endtype
, ncache
+ 2);
4510 /* Win if second argument is absolute. */
4511 if (valid1
== null_pointer_node
)
4513 /* Win if both arguments have the same relocation.
4514 Then the value is absolute. */
4515 else if (valid0
== valid1
&& valid0
!= 0)
4516 ret
= null_pointer_node
;
4517 /* Since GCC guarantees that string constants are unique in the
4518 generated code, a subtraction between two copies of the same
4519 constant string is absolute. */
4520 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4521 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4522 && operand_equal_p (valid0
, valid1
, 1))
4523 ret
= null_pointer_node
;
4524 /* Support narrowing differences. */
4526 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4530 /* Support narrowing differences. */
4531 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4546 /* Return nonzero if VALUE is a valid constant-valued expression
4547 for use in initializing a static variable; one that can be an
4548 element of a "constant" initializer.
4550 Return null_pointer_node if the value is absolute;
4551 if it is relocatable, return the variable that determines the relocation.
4552 We assume that VALUE has been folded as much as possible;
4553 therefore, we do not need to check for such things as
4554 arithmetic-combinations of integers. */
4556 initializer_constant_valid_p (tree value
, tree endtype
, bool reverse
)
4558 tree reloc
= initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4560 /* An absolute value is required with reverse storage order. */
4562 && reloc
!= null_pointer_node
4564 && !AGGREGATE_TYPE_P (endtype
)
4565 && !VECTOR_TYPE_P (endtype
))
4571 /* Return true if VALUE is a valid constant-valued expression
4572 for use in initializing a static bit-field; one that can be
4573 an element of a "constant" initializer. */
4576 initializer_constant_valid_for_bitfield_p (tree value
)
4578 /* For bitfields we support integer constants or possibly nested aggregates
4580 switch (TREE_CODE (value
))
4584 unsigned HOST_WIDE_INT idx
;
4587 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4588 if (!initializer_constant_valid_for_bitfield_p (elt
))
4597 case VIEW_CONVERT_EXPR
:
4598 case NON_LVALUE_EXPR
:
4600 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4609 /* output_constructor outer state of relevance in recursive calls, typically
4610 for nested aggregate bitfields. */
4612 struct oc_outer_state
{
4613 unsigned int bit_offset
; /* current position in ... */
4614 int byte
; /* ... the outer byte buffer. */
4617 static unsigned HOST_WIDE_INT
4618 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int, bool,
4621 /* Output assembler code for constant EXP, with no label.
4622 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4623 Assumes output_addressed_constants has been done on EXP already.
4625 Generate at least SIZE bytes of assembler data, padding at the end
4626 with zeros if necessary. SIZE must always be specified. The returned
4627 value is the actual number of bytes of assembler data generated, which
4628 may be bigger than SIZE if the object contains a variable length field.
4630 SIZE is important for structure constructors,
4631 since trailing members may have been omitted from the constructor.
4632 It is also important for initialization of arrays from string constants
4633 since the full length of the string constant might not be wanted.
4634 It is also needed for initialization of unions, where the initializer's
4635 type is just one member, and that may not be as long as the union.
4637 There a case in which we would fail to output exactly SIZE bytes:
4638 for a structure constructor that wants to produce more than SIZE bytes.
4639 But such constructors will never be generated for any possible input.
4641 ALIGN is the alignment of the data in bits.
4643 If REVERSE is true, EXP is output in reverse storage order. */
4645 static unsigned HOST_WIDE_INT
4646 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
,
4649 enum tree_code code
;
4650 unsigned HOST_WIDE_INT thissize
;
4653 if (size
== 0 || flag_syntax_only
)
4656 /* See if we're trying to initialize a pointer in a non-default mode
4657 to the address of some declaration somewhere. If the target says
4658 the mode is valid for pointers, assume the target has a way of
4660 if (TREE_CODE (exp
) == NOP_EXPR
4661 && POINTER_TYPE_P (TREE_TYPE (exp
))
4662 && targetm
.addr_space
.valid_pointer_mode
4663 (TYPE_MODE (TREE_TYPE (exp
)),
4664 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4666 tree saved_type
= TREE_TYPE (exp
);
4668 /* Peel off any intermediate conversions-to-pointer for valid
4670 while (TREE_CODE (exp
) == NOP_EXPR
4671 && POINTER_TYPE_P (TREE_TYPE (exp
))
4672 && targetm
.addr_space
.valid_pointer_mode
4673 (TYPE_MODE (TREE_TYPE (exp
)),
4674 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4675 exp
= TREE_OPERAND (exp
, 0);
4677 /* If what we're left with is the address of something, we can
4678 convert the address to the final type and output it that
4680 if (TREE_CODE (exp
) == ADDR_EXPR
)
4681 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4682 /* Likewise for constant ints. */
4683 else if (TREE_CODE (exp
) == INTEGER_CST
)
4684 exp
= fold_convert (saved_type
, exp
);
4688 /* Eliminate any conversions since we'll be outputting the underlying
4690 while (CONVERT_EXPR_P (exp
)
4691 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4692 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4694 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4695 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4697 /* Make sure eliminating the conversion is really a no-op, except with
4698 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4699 union types to allow for Ada unchecked unions. */
4700 if (type_size
> op_size
4701 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4702 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4703 /* Keep the conversion. */
4706 exp
= TREE_OPERAND (exp
, 0);
4709 code
= TREE_CODE (TREE_TYPE (exp
));
4710 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4712 /* Allow a constructor with no elements for any data type.
4713 This means to fill the space with zeros. */
4714 if (TREE_CODE (exp
) == CONSTRUCTOR
4715 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4717 assemble_zeros (size
);
4721 if (TREE_CODE (exp
) == FDESC_EXPR
)
4723 #ifdef ASM_OUTPUT_FDESC
4724 HOST_WIDE_INT part
= tree_to_shwi (TREE_OPERAND (exp
, 1));
4725 tree decl
= TREE_OPERAND (exp
, 0);
4726 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4733 /* Now output the underlying data. If we've handling the padding, return.
4734 Otherwise, break and ensure SIZE is the size written. */
4741 case REFERENCE_TYPE
:
4743 case FIXED_POINT_TYPE
:
4744 case POINTER_BOUNDS_TYPE
:
4746 cst
= expand_expr (exp
, NULL_RTX
, VOIDmode
, EXPAND_INITIALIZER
);
4748 cst
= flip_storage_order (TYPE_MODE (TREE_TYPE (exp
)), cst
);
4749 if (!assemble_integer (cst
, MIN (size
, thissize
), align
, 0))
4750 error ("initializer for integer/fixed-point value is too complicated");
4754 if (TREE_CODE (exp
) != REAL_CST
)
4755 error ("initializer for floating value is not a floating constant");
4757 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)),
4762 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
, reverse
);
4763 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4764 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)),
4770 switch (TREE_CODE (exp
))
4773 return output_constructor (exp
, size
, align
, reverse
, NULL
);
4776 = MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
), size
);
4777 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4781 machine_mode inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4782 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4783 int elt_size
= GET_MODE_SIZE (inner
);
4784 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
,
4786 thissize
= elt_size
;
4787 for (unsigned int i
= 1; i
< VECTOR_CST_NELTS (exp
); i
++)
4789 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
,
4791 thissize
+= elt_size
;
4802 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4803 return output_constructor (exp
, size
, align
, reverse
, NULL
);
4812 if (size
> thissize
)
4813 assemble_zeros (size
- thissize
);
4818 /* Subroutine of output_constructor, used for computing the size of
4819 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4820 type with an unspecified upper bound. */
4822 static unsigned HOST_WIDE_INT
4823 array_size_for_constructor (tree val
)
4826 unsigned HOST_WIDE_INT cnt
;
4827 tree index
, value
, tmp
;
4830 /* This code used to attempt to handle string constants that are not
4831 arrays of single-bytes, but nothing else does, so there's no point in
4833 if (TREE_CODE (val
) == STRING_CST
)
4834 return TREE_STRING_LENGTH (val
);
4836 max_index
= NULL_TREE
;
4837 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4839 if (TREE_CODE (index
) == RANGE_EXPR
)
4840 index
= TREE_OPERAND (index
, 1);
4841 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4845 if (max_index
== NULL_TREE
)
4848 /* Compute the total number of array elements. */
4849 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4850 i
= wi::to_offset (max_index
) - wi::to_offset (tmp
) + 1;
4852 /* Multiply by the array element unit size to find number of bytes. */
4853 i
*= wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4855 gcc_assert (wi::fits_uhwi_p (i
));
4856 return i
.to_uhwi ();
4859 /* Other datastructures + helpers for output_constructor. */
4861 /* output_constructor local state to support interaction with helpers. */
4863 struct oc_local_state
{
4865 /* Received arguments. */
4866 tree exp
; /* Constructor expression. */
4867 tree type
; /* Type of constructor expression. */
4868 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4869 unsigned int align
; /* Known initial alignment. */
4870 tree min_index
; /* Lower bound if specified for an array. */
4872 /* Output processing state. */
4873 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4874 int byte
; /* Part of a bitfield byte yet to be output. */
4875 int last_relative_index
; /* Implicit or explicit index of the last
4876 array element output within a bitfield. */
4877 bool byte_buffer_in_use
; /* Whether BYTE is in use. */
4878 bool reverse
; /* Whether reverse storage order is in use. */
4880 /* Current element. */
4881 tree field
; /* Current field decl in a record. */
4882 tree val
; /* Current element value. */
4883 tree index
; /* Current element index. */
4887 /* Helper for output_constructor. From the current LOCAL state, output a
4888 RANGE_EXPR element. */
4891 output_constructor_array_range (oc_local_state
*local
)
4893 unsigned HOST_WIDE_INT fieldsize
4894 = int_size_in_bytes (TREE_TYPE (local
->type
));
4896 HOST_WIDE_INT lo_index
4897 = tree_to_shwi (TREE_OPERAND (local
->index
, 0));
4898 HOST_WIDE_INT hi_index
4899 = tree_to_shwi (TREE_OPERAND (local
->index
, 1));
4900 HOST_WIDE_INT index
;
4903 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4905 for (index
= lo_index
; index
<= hi_index
; index
++)
4907 /* Output the element's initial value. */
4908 if (local
->val
== NULL_TREE
)
4909 assemble_zeros (fieldsize
);
4912 = output_constant (local
->val
, fieldsize
, align2
, local
->reverse
);
4914 /* Count its size. */
4915 local
->total_bytes
+= fieldsize
;
4919 /* Helper for output_constructor. From the current LOCAL state, output a
4920 field element that is not true bitfield or part of an outer one. */
4923 output_constructor_regular_field (oc_local_state
*local
)
4925 /* Field size and position. Since this structure is static, we know the
4926 positions are constant. */
4927 unsigned HOST_WIDE_INT fieldsize
;
4928 HOST_WIDE_INT fieldpos
;
4930 unsigned int align2
;
4932 if (local
->index
!= NULL_TREE
)
4934 /* Perform the index calculation in modulo arithmetic but
4935 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4936 but we are using an unsigned sizetype. */
4937 unsigned prec
= TYPE_PRECISION (sizetype
);
4938 offset_int idx
= wi::sext (wi::to_offset (local
->index
)
4939 - wi::to_offset (local
->min_index
), prec
);
4940 fieldpos
= (idx
* wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
))))
4943 else if (local
->field
!= NULL_TREE
)
4944 fieldpos
= int_byte_position (local
->field
);
4948 /* Output any buffered-up bit-fields preceding this element. */
4949 if (local
->byte_buffer_in_use
)
4951 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4952 local
->total_bytes
++;
4953 local
->byte_buffer_in_use
= false;
4956 /* Advance to offset of this element.
4957 Note no alignment needed in an array, since that is guaranteed
4958 if each element has the proper size. */
4959 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4960 && fieldpos
> local
->total_bytes
)
4962 assemble_zeros (fieldpos
- local
->total_bytes
);
4963 local
->total_bytes
= fieldpos
;
4966 /* Find the alignment of this element. */
4967 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
4969 /* Determine size this element should occupy. */
4974 /* If this is an array with an unspecified upper bound,
4975 the initializer determines the size. */
4976 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4977 but we cannot do this until the deprecated support for
4978 initializing zero-length array members is removed. */
4979 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
4980 && (!TYPE_DOMAIN (TREE_TYPE (local
->field
))
4981 || !TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
)))))
4983 fieldsize
= array_size_for_constructor (local
->val
);
4984 /* Given a non-empty initialization, this field had better
4985 be last. Given a flexible array member, the next field
4986 on the chain is a TYPE_DECL of the enclosing struct. */
4987 const_tree next
= DECL_CHAIN (local
->field
);
4988 gcc_assert (!fieldsize
|| !next
|| TREE_CODE (next
) != FIELD_DECL
);
4991 fieldsize
= tree_to_uhwi (DECL_SIZE_UNIT (local
->field
));
4994 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
4996 /* Output the element's initial value. */
4997 if (local
->val
== NULL_TREE
)
4998 assemble_zeros (fieldsize
);
5001 = output_constant (local
->val
, fieldsize
, align2
, local
->reverse
);
5003 /* Count its size. */
5004 local
->total_bytes
+= fieldsize
;
5007 /* Helper for output_constructor. From the LOCAL state, output an element
5008 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
5009 from the start of a possibly ongoing outer byte buffer. */
5012 output_constructor_bitfield (oc_local_state
*local
, unsigned int bit_offset
)
5014 /* Bit size of this element. */
5015 HOST_WIDE_INT ebitsize
5017 ? tree_to_uhwi (DECL_SIZE (local
->field
))
5018 : tree_to_uhwi (TYPE_SIZE (TREE_TYPE (local
->type
))));
5020 /* Relative index of this element if this is an array component. */
5021 HOST_WIDE_INT relative_index
5024 ? (tree_to_shwi (local
->index
)
5025 - tree_to_shwi (local
->min_index
))
5026 : local
->last_relative_index
+ 1)
5029 /* Bit position of this element from the start of the containing
5031 HOST_WIDE_INT constructor_relative_ebitpos
5033 ? int_bit_position (local
->field
)
5034 : ebitsize
* relative_index
);
5036 /* Bit position of this element from the start of a possibly ongoing
5037 outer byte buffer. */
5038 HOST_WIDE_INT byte_relative_ebitpos
5039 = bit_offset
+ constructor_relative_ebitpos
;
5041 /* From the start of a possibly ongoing outer byte buffer, offsets to
5042 the first bit of this element and to the first bit past the end of
5044 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
5045 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
5047 local
->last_relative_index
= relative_index
;
5049 if (local
->val
== NULL_TREE
)
5050 local
->val
= integer_zero_node
;
5052 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
5053 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
5054 local
->val
= TREE_OPERAND (local
->val
, 0);
5056 if (TREE_CODE (local
->val
) != INTEGER_CST
5057 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
5059 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
5063 /* If this field does not start in this (or next) byte, skip some bytes. */
5064 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5066 /* Output remnant of any bit field in previous bytes. */
5067 if (local
->byte_buffer_in_use
)
5069 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5070 local
->total_bytes
++;
5071 local
->byte_buffer_in_use
= false;
5074 /* If still not at proper byte, advance to there. */
5075 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5077 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
5078 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
5079 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
5083 /* Set up the buffer if necessary. */
5084 if (!local
->byte_buffer_in_use
)
5088 local
->byte_buffer_in_use
= true;
5091 /* If this is nested constructor, recurse passing the bit offset and the
5092 pending data, then retrieve the new pending data afterwards. */
5093 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
5095 oc_outer_state temp_state
;
5096 temp_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
5097 temp_state
.byte
= local
->byte
;
5099 += output_constructor (local
->val
, 0, 0, local
->reverse
, &temp_state
);
5100 local
->byte
= temp_state
.byte
;
5104 /* Otherwise, we must split the element into pieces that fall within
5105 separate bytes, and combine each byte with previous or following
5107 while (next_offset
< end_offset
)
5111 HOST_WIDE_INT value
;
5112 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
5113 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
5115 /* Advance from byte to byte within this element when necessary. */
5116 while (next_byte
!= local
->total_bytes
)
5118 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5119 local
->total_bytes
++;
5123 /* Number of bits we can process at once (all part of the same byte). */
5124 this_time
= MIN (end_offset
- next_offset
, BITS_PER_UNIT
- next_bit
);
5125 if (local
->reverse
? !BYTES_BIG_ENDIAN
: BYTES_BIG_ENDIAN
)
5127 /* For big-endian data, take the most significant bits (of the
5128 bits that are significant) first and put them into bytes from
5129 the most significant end. */
5130 shift
= end_offset
- next_offset
- this_time
;
5132 /* Don't try to take a bunch of bits that cross
5133 the word boundary in the INTEGER_CST. We can
5134 only select bits from one element. */
5135 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5136 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5138 const int end
= shift
+ this_time
- 1;
5139 shift
= end
& -HOST_BITS_PER_WIDE_INT
;
5140 this_time
= end
- shift
+ 1;
5143 /* Now get the bits from the appropriate constant word. */
5144 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5145 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5147 /* Get the result. This works only when:
5148 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5149 local
->byte
|= (((value
>> shift
)
5150 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5151 << (BITS_PER_UNIT
- this_time
- next_bit
));
5155 /* On little-endian machines, take the least significant bits of
5156 the value first and pack them starting at the least significant
5157 bits of the bytes. */
5158 shift
= next_offset
- byte_relative_ebitpos
;
5160 /* Don't try to take a bunch of bits that cross
5161 the word boundary in the INTEGER_CST. We can
5162 only select bits from one element. */
5163 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5164 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5166 = HOST_BITS_PER_WIDE_INT
- (shift
& (HOST_BITS_PER_WIDE_INT
- 1));
5168 /* Now get the bits from the appropriate constant word. */
5169 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5170 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5172 /* Get the result. This works only when:
5173 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5174 local
->byte
|= (((value
>> shift
)
5175 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5179 next_offset
+= this_time
;
5180 local
->byte_buffer_in_use
= true;
5184 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5185 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5186 caller output state of relevance in recursive invocations. */
5188 static unsigned HOST_WIDE_INT
5189 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
,
5190 bool reverse
, oc_outer_state
*outer
)
5192 unsigned HOST_WIDE_INT cnt
;
5193 constructor_elt
*ce
;
5194 oc_local_state local
;
5196 /* Setup our local state to communicate with helpers. */
5198 local
.type
= TREE_TYPE (exp
);
5200 local
.align
= align
;
5201 if (TREE_CODE (local
.type
) == ARRAY_TYPE
&& TYPE_DOMAIN (local
.type
))
5202 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5204 local
.min_index
= integer_zero_node
;
5206 local
.total_bytes
= 0;
5207 local
.byte_buffer_in_use
= outer
!= NULL
;
5208 local
.byte
= outer
? outer
->byte
: 0;
5209 local
.last_relative_index
= -1;
5210 /* The storage order is specified for every aggregate type. */
5211 if (AGGREGATE_TYPE_P (local
.type
))
5212 local
.reverse
= TYPE_REVERSE_STORAGE_ORDER (local
.type
);
5214 local
.reverse
= reverse
;
5216 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5218 /* As CE goes through the elements of the constant, FIELD goes through the
5219 structure fields if the constant is a structure. If the constant is a
5220 union, we override this by getting the field from the TREE_LIST element.
5221 But the constant could also be an array. Then FIELD is zero.
5223 There is always a maximum of one element in the chain LINK for unions
5224 (even if the initializer in a source program incorrectly contains
5227 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5228 local
.field
= TYPE_FIELDS (local
.type
);
5230 local
.field
= NULL_TREE
;
5233 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5234 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5236 local
.val
= ce
->value
;
5237 local
.index
= NULL_TREE
;
5239 /* The element in a union constructor specifies the proper field
5241 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5242 local
.field
= ce
->index
;
5244 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5245 local
.index
= ce
->index
;
5247 if (local
.field
&& flag_verbose_asm
)
5248 fprintf (asm_out_file
, "%s %s:\n",
5250 DECL_NAME (local
.field
)
5251 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5254 /* Eliminate the marker that makes a cast not be an lvalue. */
5255 if (local
.val
!= NULL_TREE
)
5256 STRIP_NOPS (local
.val
);
5258 /* Output the current element, using the appropriate helper ... */
5260 /* For an array slice not part of an outer bitfield. */
5262 && local
.index
!= NULL_TREE
5263 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5264 output_constructor_array_range (&local
);
5266 /* For a field that is neither a true bitfield nor part of an outer one,
5267 known to be at least byte aligned and multiple-of-bytes long. */
5269 && (local
.field
== NULL_TREE
5270 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5271 output_constructor_regular_field (&local
);
5273 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5274 supported for scalar fields, so we may need to convert first. */
5277 if (TREE_CODE (local
.val
) == REAL_CST
)
5279 = fold_unary (VIEW_CONVERT_EXPR
,
5280 build_nonstandard_integer_type
5281 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5283 output_constructor_bitfield (&local
, outer
? outer
->bit_offset
: 0);
5287 /* If we are not at toplevel, save the pending data for our caller.
5288 Otherwise output the pending data and padding zeros as needed. */
5290 outer
->byte
= local
.byte
;
5293 if (local
.byte_buffer_in_use
)
5295 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5296 local
.total_bytes
++;
5299 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5301 assemble_zeros (local
.size
- local
.total_bytes
);
5302 local
.total_bytes
= local
.size
;
5306 return local
.total_bytes
;
5309 /* Mark DECL as weak. */
5312 mark_weak (tree decl
)
5314 if (DECL_WEAK (decl
))
5317 struct symtab_node
*n
= symtab_node::get (decl
);
5318 if (n
&& n
->refuse_visibility_changes
)
5319 error ("%+D declared weak after being used", decl
);
5320 DECL_WEAK (decl
) = 1;
5322 if (DECL_RTL_SET_P (decl
)
5323 && MEM_P (DECL_RTL (decl
))
5324 && XEXP (DECL_RTL (decl
), 0)
5325 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5326 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5329 /* Merge weak status between NEWDECL and OLDDECL. */
5332 merge_weak (tree newdecl
, tree olddecl
)
5334 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5336 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5339 /* We put the NEWDECL on the weak_decls list at some point
5340 and OLDDECL as well. Keep just OLDDECL on the list. */
5341 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5342 if (TREE_VALUE (*pwd
) == newdecl
)
5344 *pwd
= TREE_CHAIN (*pwd
);
5351 if (DECL_WEAK (newdecl
))
5355 /* NEWDECL is weak, but OLDDECL is not. */
5357 /* If we already output the OLDDECL, we're in trouble; we can't
5358 go back and make it weak. This should never happen in
5359 unit-at-a-time compilation. */
5360 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5362 /* If we've already generated rtl referencing OLDDECL, we may
5363 have done so in a way that will not function properly with
5364 a weak symbol. Again in unit-at-a-time this should be
5366 gcc_assert (!TREE_USED (olddecl
)
5367 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5369 if (TARGET_SUPPORTS_WEAK
)
5371 /* We put the NEWDECL on the weak_decls list at some point.
5372 Replace it with the OLDDECL. */
5373 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5374 if (TREE_VALUE (wd
) == newdecl
)
5376 TREE_VALUE (wd
) = olddecl
;
5379 /* We may not find the entry on the list. If NEWDECL is a
5380 weak alias, then we will have already called
5381 globalize_decl to remove the entry; in that case, we do
5382 not need to do anything. */
5385 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5386 mark_weak (olddecl
);
5389 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5390 weak. Just update NEWDECL to indicate that it's weak too. */
5391 mark_weak (newdecl
);
5394 /* Declare DECL to be a weak symbol. */
5397 declare_weak (tree decl
)
5399 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5400 if (! TREE_PUBLIC (decl
))
5402 error ("weak declaration of %q+D must be public", decl
);
5405 else if (!TARGET_SUPPORTS_WEAK
)
5406 warning (0, "weak declaration of %q+D not supported", decl
);
5409 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5410 DECL_ATTRIBUTES (decl
)
5411 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5415 weak_finish_1 (tree decl
)
5417 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5418 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5421 if (! TREE_USED (decl
))
5424 #ifdef ASM_WEAKEN_DECL
5425 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5427 #ifdef ASM_WEAKEN_LABEL
5428 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5430 #ifdef ASM_OUTPUT_WEAK_ALIAS
5432 static bool warn_once
= 0;
5435 warning (0, "only weak aliases are supported in this configuration");
5445 /* Fiven an assembly name, find the decl it is associated with. */
5447 find_decl (tree target
)
5449 symtab_node
*node
= symtab_node::get_for_asmname (target
);
5455 /* This TREE_LIST contains weakref targets. */
5457 static GTY(()) tree weakref_targets
;
5459 /* Emit any pending weak declarations. */
5466 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5468 tree alias_decl
= TREE_PURPOSE (t
);
5469 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5471 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5472 /* Remove alias_decl from the weak list, but leave entries for
5473 the target alone. */
5475 #ifndef ASM_OUTPUT_WEAKREF
5476 else if (! TREE_SYMBOL_REFERENCED (target
))
5478 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5479 defined, otherwise we and weak_finish_1 would use
5480 different macros. */
5481 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5482 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5484 tree decl
= find_decl (target
);
5488 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5489 TREE_CODE (alias_decl
), target
,
5490 TREE_TYPE (alias_decl
));
5492 DECL_EXTERNAL (decl
) = 1;
5493 TREE_PUBLIC (decl
) = 1;
5494 DECL_ARTIFICIAL (decl
) = 1;
5495 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5496 TREE_USED (decl
) = 1;
5499 weak_finish_1 (decl
);
5508 /* Remove the alias and the target from the pending weak list
5509 so that we do not emit any .weak directives for the former,
5510 nor multiple .weak directives for the latter. */
5511 for (p
= &weak_decls
; (t2
= *p
) ; )
5513 if (TREE_VALUE (t2
) == alias_decl
5514 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5515 *p
= TREE_CHAIN (t2
);
5517 p
= &TREE_CHAIN (t2
);
5520 /* Remove other weakrefs to the same target, to speed things up. */
5521 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5523 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5524 *p
= TREE_CHAIN (t2
);
5526 p
= &TREE_CHAIN (t2
);
5531 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5533 tree decl
= TREE_VALUE (t
);
5535 weak_finish_1 (decl
);
5539 /* Emit the assembly bits to indicate that DECL is globally visible. */
5542 globalize_decl (tree decl
)
5545 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5546 if (DECL_WEAK (decl
))
5548 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5551 #ifdef ASM_WEAKEN_DECL
5552 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5554 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5557 /* Remove this function from the pending weak list so that
5558 we do not emit multiple .weak directives for it. */
5559 for (p
= &weak_decls
; (t
= *p
) ; )
5561 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5562 *p
= TREE_CHAIN (t
);
5564 p
= &TREE_CHAIN (t
);
5567 /* Remove weakrefs to the same target from the pending weakref
5568 list, for the same reason. */
5569 for (p
= &weakref_targets
; (t
= *p
) ; )
5571 if (DECL_ASSEMBLER_NAME (decl
)
5572 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5573 *p
= TREE_CHAIN (t
);
5575 p
= &TREE_CHAIN (t
);
5582 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5585 vec
<alias_pair
, va_gc
> *alias_pairs
;
5587 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5588 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5589 tree node is DECL to have the value of the tree node TARGET. */
5592 do_assemble_alias (tree decl
, tree target
)
5596 /* Emulated TLS had better not get this var. */
5597 gcc_assert (!(!targetm
.have_tls
5598 && TREE_CODE (decl
) == VAR_DECL
5599 && DECL_THREAD_LOCAL_P (decl
)));
5601 if (TREE_ASM_WRITTEN (decl
))
5604 id
= DECL_ASSEMBLER_NAME (decl
);
5605 ultimate_transparent_alias_target (&id
);
5606 ultimate_transparent_alias_target (&target
);
5608 /* We must force creation of DECL_RTL for debug info generation, even though
5609 we don't use it here. */
5610 make_decl_rtl (decl
);
5612 TREE_ASM_WRITTEN (decl
) = 1;
5613 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5614 TREE_ASM_WRITTEN (id
) = 1;
5616 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5618 if (!TREE_SYMBOL_REFERENCED (target
))
5619 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5621 #ifdef ASM_OUTPUT_WEAKREF
5622 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5623 IDENTIFIER_POINTER (id
),
5624 IDENTIFIER_POINTER (target
));
5626 if (!TARGET_SUPPORTS_WEAK
)
5628 error_at (DECL_SOURCE_LOCATION (decl
),
5629 "weakref is not supported in this configuration");
5636 #ifdef ASM_OUTPUT_DEF
5637 tree orig_decl
= decl
;
5639 if (TREE_CODE (decl
) == FUNCTION_DECL
5640 && cgraph_node::get (decl
)->instrumentation_clone
5641 && cgraph_node::get (decl
)->instrumented_version
)
5642 orig_decl
= cgraph_node::get (decl
)->instrumented_version
->decl
;
5644 /* Make name accessible from other files, if appropriate. */
5646 if (TREE_PUBLIC (decl
) || TREE_PUBLIC (orig_decl
))
5648 globalize_decl (decl
);
5649 maybe_assemble_visibility (decl
);
5651 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5653 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5654 if (targetm
.has_ifunc_p ())
5655 ASM_OUTPUT_TYPE_DIRECTIVE
5656 (asm_out_file
, IDENTIFIER_POINTER (id
),
5660 error_at (DECL_SOURCE_LOCATION (decl
),
5661 "ifunc is not supported on this target");
5664 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5665 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5667 ASM_OUTPUT_DEF (asm_out_file
,
5668 IDENTIFIER_POINTER (id
),
5669 IDENTIFIER_POINTER (target
));
5671 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5676 name
= IDENTIFIER_POINTER (id
);
5677 # ifdef ASM_WEAKEN_DECL
5678 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5680 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5682 /* Remove this function from the pending weak list so that
5683 we do not emit multiple .weak directives for it. */
5684 for (p
= &weak_decls
; (t
= *p
) ; )
5685 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
))
5686 || id
== DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5687 *p
= TREE_CHAIN (t
);
5689 p
= &TREE_CHAIN (t
);
5691 /* Remove weakrefs to the same target from the pending weakref
5692 list, for the same reason. */
5693 for (p
= &weakref_targets
; (t
= *p
) ; )
5695 if (id
== ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5696 *p
= TREE_CHAIN (t
);
5698 p
= &TREE_CHAIN (t
);
5704 /* Emit an assembler directive to make the symbol for DECL an alias to
5705 the symbol for TARGET. */
5708 assemble_alias (tree decl
, tree target
)
5712 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5714 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5716 ultimate_transparent_alias_target (&target
);
5718 if (alias
== target
)
5719 error ("weakref %q+D ultimately targets itself", decl
);
5720 if (TREE_PUBLIC (decl
))
5721 error ("weakref %q+D must have static linkage", decl
);
5725 #if !defined (ASM_OUTPUT_DEF)
5726 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5727 error_at (DECL_SOURCE_LOCATION (decl
),
5728 "alias definitions not supported in this configuration");
5729 TREE_ASM_WRITTEN (decl
) = 1;
5732 if (!DECL_WEAK (decl
))
5734 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5735 error_at (DECL_SOURCE_LOCATION (decl
),
5736 "ifunc is not supported in this configuration");
5738 error_at (DECL_SOURCE_LOCATION (decl
),
5739 "only weak aliases are supported in this configuration");
5740 TREE_ASM_WRITTEN (decl
) = 1;
5746 TREE_USED (decl
) = 1;
5748 /* Allow aliases to aliases. */
5749 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5750 cgraph_node::get_create (decl
)->alias
= true;
5752 varpool_node::get_create (decl
)->alias
= true;
5754 /* If the target has already been emitted, we don't have to queue the
5755 alias. This saves a tad of memory. */
5756 if (symtab
->global_info_ready
)
5757 target_decl
= find_decl (target
);
5760 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5761 || symtab
->state
>= EXPANSION
)
5762 do_assemble_alias (decl
, target
);
5765 alias_pair p
= {decl
, target
};
5766 vec_safe_push (alias_pairs
, p
);
5770 /* Record and output a table of translations from original function
5771 to its transaction aware clone. Note that tm_pure functions are
5772 considered to be their own clone. */
5774 struct tm_clone_hasher
: ggc_cache_ptr_hash
<tree_map
>
5776 static hashval_t
hash (tree_map
*m
) { return tree_map_hash (m
); }
5777 static bool equal (tree_map
*a
, tree_map
*b
) { return tree_map_eq (a
, b
); }
5780 keep_cache_entry (tree_map
*&e
)
5782 return ggc_marked_p (e
->base
.from
);
5786 static GTY((cache
)) hash_table
<tm_clone_hasher
> *tm_clone_hash
;
5789 record_tm_clone_pair (tree o
, tree n
)
5791 struct tree_map
**slot
, *h
;
5793 if (tm_clone_hash
== NULL
)
5794 tm_clone_hash
= hash_table
<tm_clone_hasher
>::create_ggc (32);
5796 h
= ggc_alloc
<tree_map
> ();
5797 h
->hash
= htab_hash_pointer (o
);
5801 slot
= tm_clone_hash
->find_slot_with_hash (h
, h
->hash
, INSERT
);
5806 get_tm_clone_pair (tree o
)
5810 struct tree_map
*h
, in
;
5813 in
.hash
= htab_hash_pointer (o
);
5814 h
= tm_clone_hash
->find_with_hash (&in
, in
.hash
);
5821 struct tm_alias_pair
5829 /* Dump the actual pairs to the .tm_clone_table section. */
5832 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5836 bool switched
= false;
5838 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5842 struct cgraph_node
*src_n
= cgraph_node::get (src
);
5843 struct cgraph_node
*dst_n
= cgraph_node::get (dst
);
5845 /* The function ipa_tm_create_version() marks the clone as needed if
5846 the original function was needed. But we also mark the clone as
5847 needed if we ever called the clone indirectly through
5848 TM_GETTMCLONE. If neither of these are true, we didn't generate
5849 a clone, and we didn't call it indirectly... no sense keeping it
5850 in the clone table. */
5851 if (!dst_n
|| !dst_n
->definition
)
5854 /* This covers the case where we have optimized the original
5855 function away, and only access the transactional clone. */
5856 if (!src_n
|| !src_n
->definition
)
5861 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5862 assemble_align (POINTER_SIZE
);
5866 assemble_integer (XEXP (DECL_RTL (src
), 0),
5867 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
5868 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5869 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
5873 /* Provide a default for the tm_clone_table section. */
5876 default_clone_table_section (void)
5878 return get_named_section (NULL
, ".tm_clone_table", 3);
5881 /* Helper comparison function for qsorting by the DECL_UID stored in
5882 alias_pair->emitted_diags. */
5885 tm_alias_pair_cmp (const void *x
, const void *y
)
5887 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5888 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5889 if (p1
->uid
< p2
->uid
)
5891 if (p1
->uid
> p2
->uid
)
5897 finish_tm_clone_pairs (void)
5899 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5901 if (tm_clone_hash
== NULL
)
5904 /* We need a determenistic order for the .tm_clone_table, otherwise
5905 we will get bootstrap comparison failures, so dump the hash table
5906 to a vector, sort it, and dump the vector. */
5908 /* Dump the hashtable to a vector. */
5910 hash_table
<tm_clone_hasher
>::iterator iter
;
5911 FOR_EACH_HASH_TABLE_ELEMENT (*tm_clone_hash
, map
, tree_map
*, iter
)
5913 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5914 tm_alias_pairs
.safe_push (p
);
5917 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5920 dump_tm_clone_pairs (tm_alias_pairs
);
5922 tm_clone_hash
->empty ();
5923 tm_clone_hash
= NULL
;
5924 tm_alias_pairs
.release ();
5928 /* Emit an assembler directive to set symbol for DECL visibility to
5929 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5932 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5933 int vis ATTRIBUTE_UNUSED
)
5935 #ifdef HAVE_GAS_HIDDEN
5936 static const char * const visibility_types
[] = {
5937 NULL
, "protected", "hidden", "internal"
5940 const char *name
, *type
;
5943 id
= DECL_ASSEMBLER_NAME (decl
);
5944 ultimate_transparent_alias_target (&id
);
5945 name
= IDENTIFIER_POINTER (id
);
5947 type
= visibility_types
[vis
];
5949 fprintf (asm_out_file
, "\t.%s\t", type
);
5950 assemble_name (asm_out_file
, name
);
5951 fprintf (asm_out_file
, "\n");
5953 if (!DECL_ARTIFICIAL (decl
))
5954 warning (OPT_Wattributes
, "visibility attribute not supported "
5955 "in this configuration; ignored");
5959 /* A helper function to call assemble_visibility when needed for a decl. */
5962 maybe_assemble_visibility (tree decl
)
5964 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5966 if (TREE_CODE (decl
) == FUNCTION_DECL
5967 && cgraph_node::get (decl
)
5968 && cgraph_node::get (decl
)->instrumentation_clone
5969 && cgraph_node::get (decl
)->instrumented_version
)
5970 vis
= DECL_VISIBILITY (cgraph_node::get (decl
)->instrumented_version
->decl
);
5972 if (vis
!= VISIBILITY_DEFAULT
)
5974 targetm
.asm_out
.assemble_visibility (decl
, vis
);
5981 /* Returns 1 if the target configuration supports defining public symbols
5982 so that one of them will be chosen at link time instead of generating a
5983 multiply-defined symbol error, whether through the use of weak symbols or
5984 a target-specific mechanism for having duplicates discarded. */
5987 supports_one_only (void)
5989 if (SUPPORTS_ONE_ONLY
)
5991 return TARGET_SUPPORTS_WEAK
;
5994 /* Set up DECL as a public symbol that can be defined in multiple
5995 translation units without generating a linker error. */
5998 make_decl_one_only (tree decl
, tree comdat_group
)
6000 struct symtab_node
*symbol
;
6001 gcc_assert (TREE_CODE (decl
) == VAR_DECL
6002 || TREE_CODE (decl
) == FUNCTION_DECL
);
6004 TREE_PUBLIC (decl
) = 1;
6006 if (TREE_CODE (decl
) == VAR_DECL
)
6007 symbol
= varpool_node::get_create (decl
);
6009 symbol
= cgraph_node::get_create (decl
);
6011 if (SUPPORTS_ONE_ONLY
)
6013 #ifdef MAKE_DECL_ONE_ONLY
6014 MAKE_DECL_ONE_ONLY (decl
);
6016 symbol
->set_comdat_group (comdat_group
);
6018 else if (TREE_CODE (decl
) == VAR_DECL
6019 && (DECL_INITIAL (decl
) == 0
6020 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6021 DECL_COMMON (decl
) = 1;
6024 gcc_assert (TARGET_SUPPORTS_WEAK
);
6025 DECL_WEAK (decl
) = 1;
6030 init_varasm_once (void)
6032 section_htab
= hash_table
<section_hasher
>::create_ggc (31);
6033 object_block_htab
= hash_table
<object_block_hasher
>::create_ggc (31);
6034 const_desc_htab
= hash_table
<tree_descriptor_hasher
>::create_ggc (1009);
6036 shared_constant_pool
= create_constant_pool ();
6038 #ifdef TEXT_SECTION_ASM_OP
6039 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
6040 TEXT_SECTION_ASM_OP
);
6043 #ifdef DATA_SECTION_ASM_OP
6044 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6045 DATA_SECTION_ASM_OP
);
6048 #ifdef SDATA_SECTION_ASM_OP
6049 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6050 SDATA_SECTION_ASM_OP
);
6053 #ifdef READONLY_DATA_SECTION_ASM_OP
6054 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
6055 READONLY_DATA_SECTION_ASM_OP
);
6058 #ifdef CTORS_SECTION_ASM_OP
6059 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
6060 CTORS_SECTION_ASM_OP
);
6063 #ifdef DTORS_SECTION_ASM_OP
6064 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
6065 DTORS_SECTION_ASM_OP
);
6068 #ifdef BSS_SECTION_ASM_OP
6069 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6070 output_section_asm_op
,
6071 BSS_SECTION_ASM_OP
);
6074 #ifdef SBSS_SECTION_ASM_OP
6075 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6076 output_section_asm_op
,
6077 SBSS_SECTION_ASM_OP
);
6080 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6081 | SECTION_COMMON
, emit_tls_common
);
6082 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6083 | SECTION_COMMON
, emit_local
);
6084 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6085 | SECTION_COMMON
, emit_common
);
6087 #if defined ASM_OUTPUT_ALIGNED_BSS
6088 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
6092 targetm
.asm_out
.init_sections ();
6094 if (readonly_data_section
== NULL
)
6095 readonly_data_section
= text_section
;
6097 #ifdef ASM_OUTPUT_EXTERNAL
6098 pending_assemble_externals_set
= new hash_set
<tree
>;
6103 decl_default_tls_model (const_tree decl
)
6105 enum tls_model kind
;
6108 is_local
= targetm
.binds_local_p (decl
);
6112 kind
= TLS_MODEL_LOCAL_EXEC
;
6114 kind
= TLS_MODEL_INITIAL_EXEC
;
6117 /* Local dynamic is inefficient when we're not combining the
6118 parts of the address. */
6119 else if (optimize
&& is_local
)
6120 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
6122 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
6123 if (kind
< flag_tls_default
)
6124 kind
= flag_tls_default
;
6129 /* Select a set of attributes for section NAME based on the properties
6130 of DECL and whether or not RELOC indicates that DECL's initializer
6131 might contain runtime relocations.
6133 We make the section read-only and executable for a function decl,
6134 read-only for a const data decl, and writable for a non-const data decl. */
6137 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6141 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6142 flags
= SECTION_CODE
;
6145 enum section_category category
6146 = categorize_decl_for_section (decl
, reloc
);
6147 if (decl_readonly_section_1 (category
))
6149 else if (category
== SECCAT_DATA_REL_RO
6150 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6151 flags
= SECTION_WRITE
| SECTION_RELRO
;
6153 flags
= SECTION_WRITE
;
6157 flags
= SECTION_WRITE
;
6158 if (strcmp (name
, ".data.rel.ro") == 0
6159 || strcmp (name
, ".data.rel.ro.local") == 0)
6160 flags
|= SECTION_RELRO
;
6163 if (decl
&& DECL_P (decl
) && DECL_COMDAT_GROUP (decl
))
6164 flags
|= SECTION_LINKONCE
;
6166 if (strcmp (name
, ".vtable_map_vars") == 0)
6167 flags
|= SECTION_LINKONCE
;
6169 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6170 flags
|= SECTION_TLS
| SECTION_WRITE
;
6172 if (strcmp (name
, ".bss") == 0
6173 || strncmp (name
, ".bss.", 5) == 0
6174 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6175 || strcmp (name
, ".persistent.bss") == 0
6176 || strcmp (name
, ".sbss") == 0
6177 || strncmp (name
, ".sbss.", 6) == 0
6178 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6179 flags
|= SECTION_BSS
;
6181 if (strcmp (name
, ".tdata") == 0
6182 || strncmp (name
, ".tdata.", 7) == 0
6183 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6184 flags
|= SECTION_TLS
;
6186 if (strcmp (name
, ".tbss") == 0
6187 || strncmp (name
, ".tbss.", 6) == 0
6188 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6189 flags
|= SECTION_TLS
| SECTION_BSS
;
6191 /* These three sections have special ELF types. They are neither
6192 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6193 want to print a section type (@progbits or @nobits). If someone
6194 is silly enough to emit code or TLS variables to one of these
6195 sections, then don't handle them specially. */
6196 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6197 && (strcmp (name
, ".init_array") == 0
6198 || strcmp (name
, ".fini_array") == 0
6199 || strcmp (name
, ".preinit_array") == 0))
6200 flags
|= SECTION_NOTYPE
;
6205 /* Return true if the target supports some form of global BSS,
6206 either through bss_noswitch_section, or by selecting a BSS
6207 section in TARGET_ASM_SELECT_SECTION. */
6210 have_global_bss_p (void)
6212 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6215 /* Output assembly to switch to section NAME with attribute FLAGS.
6216 Four variants for common object file formats. */
6219 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6220 unsigned int flags ATTRIBUTE_UNUSED
,
6221 tree decl ATTRIBUTE_UNUSED
)
6223 /* Some object formats don't support named sections at all. The
6224 front-end should already have flagged this as an error. */
6228 #ifndef TLS_SECTION_ASM_FLAG
6229 #define TLS_SECTION_ASM_FLAG 'T'
6233 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6236 char flagchars
[10], *f
= flagchars
;
6238 /* If we have already declared this section, we can use an
6239 abbreviated form to switch back to it -- unless this section is
6240 part of a COMDAT groups, in which case GAS requires the full
6241 declaration every time. */
6242 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6243 && (flags
& SECTION_DECLARED
))
6245 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6249 if (!(flags
& SECTION_DEBUG
))
6251 #if defined (HAVE_GAS_SECTION_EXCLUDE) && HAVE_GAS_SECTION_EXCLUDE == 1
6252 if (flags
& SECTION_EXCLUDE
)
6255 if (flags
& SECTION_WRITE
)
6257 if (flags
& SECTION_CODE
)
6259 if (flags
& SECTION_SMALL
)
6261 if (flags
& SECTION_MERGE
)
6263 if (flags
& SECTION_STRINGS
)
6265 if (flags
& SECTION_TLS
)
6266 *f
++ = TLS_SECTION_ASM_FLAG
;
6267 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6271 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6273 if (!(flags
& SECTION_NOTYPE
))
6278 if (flags
& SECTION_BSS
)
6284 /* On platforms that use "@" as the assembly comment character,
6286 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6288 fprintf (asm_out_file
, format
, type
);
6290 if (flags
& SECTION_ENTSIZE
)
6291 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6292 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6294 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6295 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6297 fprintf (asm_out_file
, ",%s,comdat",
6298 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6302 putc ('\n', asm_out_file
);
6306 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6307 tree decl ATTRIBUTE_UNUSED
)
6309 char flagchars
[8], *f
= flagchars
;
6311 if (flags
& SECTION_WRITE
)
6313 if (flags
& SECTION_CODE
)
6317 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6321 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6324 default_coff_asm_named_section (name
, flags
, decl
);
6326 if (flags
& SECTION_LINKONCE
)
6328 /* Functions may have been compiled at various levels of
6329 optimization so we can't use `same_size' here.
6330 Instead, have the linker pick one. */
6331 fprintf (asm_out_file
, "\t.linkonce %s\n",
6332 (flags
& SECTION_CODE
? "discard" : "same_size"));
6336 /* The lame default section selector. */
6339 default_select_section (tree decl
, int reloc
,
6340 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6344 if (decl_readonly_section (decl
, reloc
))
6345 return readonly_data_section
;
6347 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6349 if (! ((flag_pic
&& reloc
)
6350 || !TREE_READONLY (decl
)
6351 || TREE_SIDE_EFFECTS (decl
)
6352 || !TREE_CONSTANT (decl
)))
6353 return readonly_data_section
;
6355 else if (TREE_CODE (decl
) == STRING_CST
)
6356 return readonly_data_section
;
6357 else if (! (flag_pic
&& reloc
))
6358 return readonly_data_section
;
6360 return data_section
;
6363 enum section_category
6364 categorize_decl_for_section (const_tree decl
, int reloc
)
6366 enum section_category ret
;
6368 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6370 else if (TREE_CODE (decl
) == STRING_CST
)
6372 if ((flag_sanitize
& SANITIZE_ADDRESS
)
6373 && asan_protect_global (CONST_CAST_TREE (decl
)))
6374 /* or !flag_merge_constants */
6375 return SECCAT_RODATA
;
6377 return SECCAT_RODATA_MERGE_STR
;
6379 else if (TREE_CODE (decl
) == VAR_DECL
)
6381 if (bss_initializer_p (decl
))
6383 else if (! TREE_READONLY (decl
)
6384 || TREE_SIDE_EFFECTS (decl
)
6385 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6387 /* Here the reloc_rw_mask is not testing whether the section should
6388 be read-only or not, but whether the dynamic link will have to
6389 do something. If so, we wish to segregate the data in order to
6390 minimize cache misses inside the dynamic linker. */
6391 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6392 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6396 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6397 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6398 else if (reloc
|| flag_merge_constants
< 2
6399 || ((flag_sanitize
& SANITIZE_ADDRESS
)
6400 && asan_protect_global (CONST_CAST_TREE (decl
))))
6401 /* C and C++ don't allow different variables to share the same
6402 location. -fmerge-all-constants allows even that (at the
6403 expense of not conforming). */
6404 ret
= SECCAT_RODATA
;
6405 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6406 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6408 ret
= SECCAT_RODATA_MERGE_CONST
;
6410 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6412 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6413 || TREE_SIDE_EFFECTS (decl
)
6414 || ! TREE_CONSTANT (decl
))
6417 ret
= SECCAT_RODATA
;
6420 ret
= SECCAT_RODATA
;
6422 /* There are no read-only thread-local sections. */
6423 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6425 /* Note that this would be *just* SECCAT_BSS, except that there's
6426 no concept of a read-only thread-local-data section. */
6427 if (ret
== SECCAT_BSS
6428 || (flag_zero_initialized_in_bss
6429 && initializer_zerop (DECL_INITIAL (decl
))))
6435 /* If the target uses small data sections, select it. */
6436 else if (targetm
.in_small_data_p (decl
))
6438 if (ret
== SECCAT_BSS
)
6440 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6441 ret
= SECCAT_SRODATA
;
6450 decl_readonly_section_1 (enum section_category category
)
6455 case SECCAT_RODATA_MERGE_STR
:
6456 case SECCAT_RODATA_MERGE_STR_INIT
:
6457 case SECCAT_RODATA_MERGE_CONST
:
6458 case SECCAT_SRODATA
:
6466 decl_readonly_section (const_tree decl
, int reloc
)
6468 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6471 /* Select a section based on the above categorization. */
6474 default_elf_select_section (tree decl
, int reloc
,
6475 unsigned HOST_WIDE_INT align
)
6478 switch (categorize_decl_for_section (decl
, reloc
))
6481 /* We're not supposed to be called on FUNCTION_DECLs. */
6484 return readonly_data_section
;
6485 case SECCAT_RODATA_MERGE_STR
:
6486 return mergeable_string_section (decl
, align
, 0);
6487 case SECCAT_RODATA_MERGE_STR_INIT
:
6488 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6489 case SECCAT_RODATA_MERGE_CONST
:
6490 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6491 case SECCAT_SRODATA
:
6495 return data_section
;
6496 case SECCAT_DATA_REL
:
6497 sname
= ".data.rel";
6499 case SECCAT_DATA_REL_LOCAL
:
6500 sname
= ".data.rel.local";
6502 case SECCAT_DATA_REL_RO
:
6503 sname
= ".data.rel.ro";
6505 case SECCAT_DATA_REL_RO_LOCAL
:
6506 sname
= ".data.rel.ro.local";
6529 return get_named_section (decl
, sname
, reloc
);
6532 /* Construct a unique section name based on the decl name and the
6533 categorization performed above. */
6536 default_unique_section (tree decl
, int reloc
)
6538 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6539 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6540 const char *prefix
, *name
, *linkonce
;
6544 switch (categorize_decl_for_section (decl
, reloc
))
6547 prefix
= one_only
? ".t" : ".text";
6550 case SECCAT_RODATA_MERGE_STR
:
6551 case SECCAT_RODATA_MERGE_STR_INIT
:
6552 case SECCAT_RODATA_MERGE_CONST
:
6553 prefix
= one_only
? ".r" : ".rodata";
6555 case SECCAT_SRODATA
:
6556 prefix
= one_only
? ".s2" : ".sdata2";
6559 prefix
= one_only
? ".d" : ".data";
6561 case SECCAT_DATA_REL
:
6562 prefix
= one_only
? ".d.rel" : ".data.rel";
6564 case SECCAT_DATA_REL_LOCAL
:
6565 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6567 case SECCAT_DATA_REL_RO
:
6568 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6570 case SECCAT_DATA_REL_RO_LOCAL
:
6571 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6574 prefix
= one_only
? ".s" : ".sdata";
6577 prefix
= one_only
? ".b" : ".bss";
6580 prefix
= one_only
? ".sb" : ".sbss";
6583 prefix
= one_only
? ".td" : ".tdata";
6586 prefix
= one_only
? ".tb" : ".tbss";
6592 id
= DECL_ASSEMBLER_NAME (decl
);
6593 ultimate_transparent_alias_target (&id
);
6594 name
= IDENTIFIER_POINTER (id
);
6595 name
= targetm
.strip_name_encoding (name
);
6597 /* If we're using one_only, then there needs to be a .gnu.linkonce
6598 prefix to the section name. */
6599 linkonce
= one_only
? ".gnu.linkonce" : "";
6601 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6603 set_decl_section_name (decl
, string
);
6606 /* Subroutine of compute_reloc_for_rtx for leaf rtxes. */
6609 compute_reloc_for_rtx_1 (const_rtx x
)
6611 switch (GET_CODE (x
))
6614 return SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6622 /* Like compute_reloc_for_constant, except for an RTX. The return value
6623 is a mask for which bit 1 indicates a global relocation, and bit 0
6624 indicates a local relocation. */
6627 compute_reloc_for_rtx (const_rtx x
)
6629 switch (GET_CODE (x
))
6633 return compute_reloc_for_rtx_1 (x
);
6638 subrtx_iterator::array_type array
;
6639 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
6640 reloc
|= compute_reloc_for_rtx_1 (*iter
);
6650 default_select_rtx_section (machine_mode mode ATTRIBUTE_UNUSED
,
6652 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6654 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6655 return data_section
;
6657 return readonly_data_section
;
6661 default_elf_select_rtx_section (machine_mode mode
, rtx x
,
6662 unsigned HOST_WIDE_INT align
)
6664 int reloc
= compute_reloc_for_rtx (x
);
6666 /* ??? Handle small data here somehow. */
6668 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6671 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6673 return get_named_section (NULL
, ".data.rel.ro", 3);
6676 return mergeable_constant_section (mode
, align
, 0);
6679 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6682 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6687 /* Careful not to prod global register variables. */
6690 symbol
= XEXP (rtl
, 0);
6691 if (GET_CODE (symbol
) != SYMBOL_REF
)
6694 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6695 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6696 flags
|= SYMBOL_FLAG_FUNCTION
;
6697 if (targetm
.binds_local_p (decl
))
6698 flags
|= SYMBOL_FLAG_LOCAL
;
6699 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6700 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6701 else if (targetm
.in_small_data_p (decl
))
6702 flags
|= SYMBOL_FLAG_SMALL
;
6703 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6704 being PUBLIC, the thing *must* be defined in this translation unit.
6705 Prevent this buglet from being propagated into rtl code as well. */
6706 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6707 flags
|= SYMBOL_FLAG_EXTERNAL
;
6709 SYMBOL_REF_FLAGS (symbol
) = flags
;
6712 /* By default, we do nothing for encode_section_info, so we need not
6713 do anything but discard the '*' marker. */
6716 default_strip_name_encoding (const char *str
)
6718 return str
+ (*str
== '*');
6721 #ifdef ASM_OUTPUT_DEF
6722 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6723 anchor relative to ".", the current section position. */
6726 default_asm_output_anchor (rtx symbol
)
6730 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6731 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6732 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6736 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6739 default_use_anchors_for_symbol_p (const_rtx symbol
)
6744 /* Don't use anchors for mergeable sections. The linker might move
6745 the objects around. */
6746 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6747 if (sect
->common
.flags
& SECTION_MERGE
)
6750 /* Don't use anchors for small data sections. The small data register
6751 acts as an anchor for such sections. */
6752 if (sect
->common
.flags
& SECTION_SMALL
)
6755 decl
= SYMBOL_REF_DECL (symbol
);
6756 if (decl
&& DECL_P (decl
))
6758 /* Don't use section anchors for decls that might be defined or
6759 usurped by other modules. */
6760 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
6763 /* Don't use section anchors for decls that will be placed in a
6764 small data section. */
6765 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6766 one above. The problem is that we only use SECTION_SMALL for
6767 sections that should be marked as small in the section directive. */
6768 if (targetm
.in_small_data_p (decl
))
6774 /* Return true when RESOLUTION indicate that symbol will be bound to the
6775 definition provided by current .o file. */
6778 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6780 return (resolution
== LDPR_PREVAILING_DEF
6781 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6782 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6785 /* Return true when RESOLUTION indicate that symbol will be bound locally
6786 within current executable or DSO. */
6789 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6791 return (resolution
== LDPR_PREVAILING_DEF
6792 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6793 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6794 || resolution
== LDPR_PREEMPTED_REG
6795 || resolution
== LDPR_PREEMPTED_IR
6796 || resolution
== LDPR_RESOLVED_IR
6797 || resolution
== LDPR_RESOLVED_EXEC
);
6800 /* COMMON_LOCAL_P is true means that the linker can guarantee that an
6801 uninitialized common symbol in the executable will still be defined
6802 (through COPY relocation) in the executable. */
6805 default_binds_local_p_3 (const_tree exp
, bool shlib
, bool weak_dominate
,
6806 bool extern_protected_data
, bool common_local_p
)
6808 /* A non-decl is an entry in the constant pool. */
6812 /* Weakrefs may not bind locally, even though the weakref itself is always
6813 static and therefore local. Similarly, the resolver for ifunc functions
6814 might resolve to a non-local function.
6815 FIXME: We can resolve the weakref case more curefuly by looking at the
6817 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6818 || (TREE_CODE (exp
) == FUNCTION_DECL
6819 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6822 /* Static variables are always local. */
6823 if (! TREE_PUBLIC (exp
))
6826 /* With resolution file in hand, take look into resolutions.
6827 We can't just return true for resolved_locally symbols,
6828 because dynamic linking might overwrite symbols
6829 in shared libraries. */
6830 bool resolved_locally
= false;
6832 bool uninited_common
= (DECL_COMMON (exp
)
6833 && (DECL_INITIAL (exp
) == NULL
6835 && DECL_INITIAL (exp
) == error_mark_node
)));
6837 /* A non-external variable is defined locally only if it isn't
6838 uninitialized COMMON variable or common_local_p is true. */
6839 bool defined_locally
= (!DECL_EXTERNAL (exp
)
6840 && (!uninited_common
|| common_local_p
));
6841 if (symtab_node
*node
= symtab_node::get (exp
))
6843 if (node
->in_other_partition
)
6844 defined_locally
= true;
6845 if (node
->can_be_discarded_p ())
6847 else if (resolution_to_local_definition_p (node
->resolution
))
6848 defined_locally
= resolved_locally
= true;
6849 else if (resolution_local_p (node
->resolution
))
6850 resolved_locally
= true;
6852 if (defined_locally
&& weak_dominate
&& !shlib
)
6853 resolved_locally
= true;
6855 /* Undefined weak symbols are never defined locally. */
6856 if (DECL_WEAK (exp
) && !defined_locally
)
6859 /* A symbol is local if the user has said explicitly that it will be,
6860 or if we have a definition for the symbol. We cannot infer visibility
6861 for undefined symbols. */
6862 if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
6863 && (TREE_CODE (exp
) == FUNCTION_DECL
6864 || !extern_protected_data
6865 || DECL_VISIBILITY (exp
) != VISIBILITY_PROTECTED
)
6866 && (DECL_VISIBILITY_SPECIFIED (exp
) || defined_locally
))
6869 /* If PIC, then assume that any global name can be overridden by
6870 symbols resolved from other modules. */
6874 /* Variables defined outside this object might not be local. */
6875 if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6878 /* Non-dominant weak symbols are not defined locally. */
6879 if (DECL_WEAK (exp
) && !resolved_locally
)
6882 /* Uninitialized COMMON variable may be unified with symbols
6883 resolved from other modules. */
6884 if (uninited_common
&& !resolved_locally
)
6887 /* Otherwise we're left with initialized (or non-common) global data
6888 which is of necessity defined locally. */
6892 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6893 wrt cross-module name binding. */
6896 default_binds_local_p (const_tree exp
)
6898 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, false, false);
6901 /* Similar to default_binds_local_p, but common symbol may be local and
6902 extern protected data is non-local. */
6905 default_binds_local_p_2 (const_tree exp
)
6907 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, true,
6912 default_binds_local_p_1 (const_tree exp
, int shlib
)
6914 return default_binds_local_p_3 (exp
, shlib
!= 0, false, false, false);
6917 /* Return true when references to DECL must bind to current definition in
6920 The condition is usually equivalent to whether the function binds to the
6921 current module (shared library or executable), that is to binds_local_p.
6922 We use this fact to avoid need for another target hook and implement
6923 the logic using binds_local_p and just special cases where
6924 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6925 the weak definitions (that can be overwritten at linktime by other
6926 definition from different object file) and when resolution info is available
6927 we simply use the knowledge passed to us by linker plugin. */
6929 decl_binds_to_current_def_p (const_tree decl
)
6931 gcc_assert (DECL_P (decl
));
6932 if (!targetm
.binds_local_p (decl
))
6934 if (!TREE_PUBLIC (decl
))
6937 /* When resolution is available, just use it. */
6938 if (symtab_node
*node
= symtab_node::get (decl
))
6940 if (node
->resolution
!= LDPR_UNKNOWN
6941 && !node
->can_be_discarded_p ())
6942 return resolution_to_local_definition_p (node
->resolution
);
6945 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6946 binds locally but still can be overwritten), DECL_COMMON (can be merged
6947 with a non-common definition somewhere in the same module) or
6949 This rely on fact that binds_local_p behave as decl_replaceable_p
6950 for all other declaration types. */
6951 if (DECL_WEAK (decl
))
6953 if (DECL_COMMON (decl
)
6954 && (DECL_INITIAL (decl
) == NULL
6955 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6957 if (DECL_EXTERNAL (decl
))
6962 /* A replaceable function or variable is one which may be replaced
6963 at link-time with an entirely different definition, provided that the
6964 replacement has the same type. For example, functions declared
6965 with __attribute__((weak)) on most systems are replaceable.
6967 COMDAT functions are not replaceable, since all definitions of the
6968 function must be equivalent. It is important that COMDAT functions
6969 not be treated as replaceable so that use of C++ template
6970 instantiations is not penalized. */
6973 decl_replaceable_p (tree decl
)
6975 gcc_assert (DECL_P (decl
));
6976 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
6978 if (!flag_semantic_interposition
6979 && !DECL_WEAK (decl
))
6981 return !decl_binds_to_current_def_p (decl
);
6984 /* Default function to output code that will globalize a label. A
6985 target must define GLOBAL_ASM_OP or provide its own function to
6986 globalize a label. */
6987 #ifdef GLOBAL_ASM_OP
6989 default_globalize_label (FILE * stream
, const char *name
)
6991 fputs (GLOBAL_ASM_OP
, stream
);
6992 assemble_name (stream
, name
);
6993 putc ('\n', stream
);
6995 #endif /* GLOBAL_ASM_OP */
6997 /* Default function to output code that will globalize a declaration. */
6999 default_globalize_decl_name (FILE * stream
, tree decl
)
7001 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
7002 targetm
.asm_out
.globalize_label (stream
, name
);
7005 /* Default function to output a label for unwind information. The
7006 default is to do nothing. A target that needs nonlocal labels for
7007 unwind information must provide its own function to do this. */
7009 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
7010 tree decl ATTRIBUTE_UNUSED
,
7011 int for_eh ATTRIBUTE_UNUSED
,
7012 int empty ATTRIBUTE_UNUSED
)
7016 /* Default function to output a label to divide up the exception table.
7017 The default is to do nothing. A target that needs/wants to divide
7018 up the table must provide it's own function to do this. */
7020 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
7024 /* This is how to output an internal numbered label where PREFIX is
7025 the class of label and LABELNO is the number within the class. */
7028 default_generate_internal_label (char *buf
, const char *prefix
,
7029 unsigned long labelno
)
7031 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7034 /* This is how to output an internal numbered label where PREFIX is
7035 the class of label and LABELNO is the number within the class. */
7038 default_internal_label (FILE *stream
, const char *prefix
,
7039 unsigned long labelno
)
7041 char *const buf
= (char *) alloca (40 + strlen (prefix
));
7042 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7043 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
7047 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
7050 default_asm_declare_constant_name (FILE *file
, const char *name
,
7051 const_tree exp ATTRIBUTE_UNUSED
,
7052 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
7054 assemble_label (file
, name
);
7057 /* This is the default behavior at the beginning of a file. It's
7058 controlled by two other target-hook toggles. */
7060 default_file_start (void)
7062 if (targetm
.asm_file_start_app_off
7063 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
7064 fputs (ASM_APP_OFF
, asm_out_file
);
7066 if (targetm
.asm_file_start_file_directive
)
7068 /* LTO produced units have no meaningful main_input_filename. */
7070 output_file_directive (asm_out_file
, "<artificial>");
7072 output_file_directive (asm_out_file
, main_input_filename
);
7076 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
7077 which emits a special section directive used to indicate whether or
7078 not this object file needs an executable stack. This is primarily
7079 a GNU extension to ELF but could be used on other targets. */
7081 int trampolines_created
;
7084 file_end_indicate_exec_stack (void)
7086 unsigned int flags
= SECTION_DEBUG
;
7087 if (trampolines_created
)
7088 flags
|= SECTION_CODE
;
7090 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
7093 /* Emit a special section directive to indicate that this object file
7094 was compiled with -fsplit-stack. This is used to let the linker
7095 detect calls between split-stack code and non-split-stack code, so
7096 that it can modify the split-stack code to allocate a sufficiently
7097 large stack. We emit another special section if there are any
7098 functions in this file which have the no_split_stack attribute, to
7099 prevent the linker from warning about being unable to convert the
7100 functions if they call non-split-stack code. */
7103 file_end_indicate_split_stack (void)
7105 if (flag_split_stack
)
7107 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
7109 if (saw_no_split_stack
)
7110 switch_to_section (get_section (".note.GNU-no-split-stack",
7111 SECTION_DEBUG
, NULL
));
7115 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
7116 a get_unnamed_section callback. */
7119 output_section_asm_op (const void *directive
)
7121 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
7124 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
7125 the current section is NEW_SECTION. */
7128 switch_to_section (section
*new_section
)
7130 if (in_section
== new_section
)
7133 if (new_section
->common
.flags
& SECTION_FORGET
)
7136 in_section
= new_section
;
7138 switch (SECTION_STYLE (new_section
))
7141 targetm
.asm_out
.named_section (new_section
->named
.name
,
7142 new_section
->named
.common
.flags
,
7143 new_section
->named
.decl
);
7146 case SECTION_UNNAMED
:
7147 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
7150 case SECTION_NOSWITCH
:
7155 new_section
->common
.flags
|= SECTION_DECLARED
;
7158 /* If block symbol SYMBOL has not yet been assigned an offset, place
7159 it at the end of its block. */
7162 place_block_symbol (rtx symbol
)
7164 unsigned HOST_WIDE_INT size
, mask
, offset
;
7165 struct constant_descriptor_rtx
*desc
;
7166 unsigned int alignment
;
7167 struct object_block
*block
;
7170 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7171 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7174 /* Work out the symbol's size and alignment. */
7175 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7177 desc
= SYMBOL_REF_CONSTANT (symbol
);
7178 alignment
= desc
->align
;
7179 size
= GET_MODE_SIZE (desc
->mode
);
7181 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7183 decl
= SYMBOL_REF_DECL (symbol
);
7184 gcc_checking_assert (DECL_IN_CONSTANT_POOL (decl
));
7185 alignment
= DECL_ALIGN (decl
);
7186 size
= get_constant_size (DECL_INITIAL (decl
));
7187 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7188 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7189 && asan_protect_global (DECL_INITIAL (decl
)))
7190 size
+= asan_red_zone_size (size
);
7194 struct symtab_node
*snode
;
7195 decl
= SYMBOL_REF_DECL (symbol
);
7197 snode
= symtab_node::get (decl
);
7200 rtx target
= DECL_RTL (snode
->ultimate_alias_target ()->decl
);
7202 gcc_assert (MEM_P (target
)
7203 && GET_CODE (XEXP (target
, 0)) == SYMBOL_REF
7204 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (target
, 0)));
7205 target
= XEXP (target
, 0);
7206 place_block_symbol (target
);
7207 SYMBOL_REF_BLOCK_OFFSET (symbol
) = SYMBOL_REF_BLOCK_OFFSET (target
);
7210 alignment
= get_variable_align (decl
);
7211 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7212 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7213 && asan_protect_global (decl
))
7215 size
+= asan_red_zone_size (size
);
7216 alignment
= MAX (alignment
,
7217 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7221 /* Calculate the object's offset from the start of the block. */
7222 block
= SYMBOL_REF_BLOCK (symbol
);
7223 mask
= alignment
/ BITS_PER_UNIT
- 1;
7224 offset
= (block
->size
+ mask
) & ~mask
;
7225 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7227 /* Record the block's new alignment and size. */
7228 block
->alignment
= MAX (block
->alignment
, alignment
);
7229 block
->size
= offset
+ size
;
7231 vec_safe_push (block
->objects
, symbol
);
7234 /* Return the anchor that should be used to address byte offset OFFSET
7235 from the first object in BLOCK. MODEL is the TLS model used
7239 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7240 enum tls_model model
)
7243 unsigned int begin
, middle
, end
;
7244 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7247 /* Work out the anchor's offset. Use an offset of 0 for the first
7248 anchor so that we don't pessimize the case where we take the address
7249 of a variable at the beginning of the block. This is particularly
7250 useful when a block has only one variable assigned to it.
7252 We try to place anchors RANGE bytes apart, so there can then be
7253 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7254 a ptr_mode offset. With some target settings, the lowest such
7255 anchor might be out of range for the lowest ptr_mode offset;
7256 likewise the highest anchor for the highest offset. Use anchors
7257 at the extreme ends of the ptr_mode range in such cases.
7259 All arithmetic uses unsigned integers in order to avoid
7261 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7262 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7263 range
= max_offset
- min_offset
+ 1;
7268 bias
= HOST_WIDE_INT_1U
<< (GET_MODE_BITSIZE (ptr_mode
) - 1);
7271 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7272 delta
-= delta
% range
;
7275 offset
= (HOST_WIDE_INT
) (-delta
);
7279 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7280 delta
-= delta
% range
;
7281 if (delta
> bias
- 1)
7283 offset
= (HOST_WIDE_INT
) delta
;
7287 /* Do a binary search to see if there's already an anchor we can use.
7288 Set BEGIN to the new anchor's index if not. */
7290 end
= vec_safe_length (block
->anchors
);
7291 while (begin
!= end
)
7293 middle
= (end
+ begin
) / 2;
7294 anchor
= (*block
->anchors
)[middle
];
7295 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7297 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7299 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7301 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7307 /* Create a new anchor with a unique label. */
7308 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7309 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7310 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7311 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7313 /* Insert it at index BEGIN. */
7314 vec_safe_insert (block
->anchors
, begin
, anchor
);
7318 /* Output the objects in BLOCK. */
7321 output_object_block (struct object_block
*block
)
7323 struct constant_descriptor_rtx
*desc
;
7325 HOST_WIDE_INT offset
;
7329 if (!block
->objects
)
7332 /* Switch to the section and make sure that the first byte is
7333 suitably aligned. */
7334 /* Special case VTV comdat sections similar to assemble_variable. */
7335 if (SECTION_STYLE (block
->sect
) == SECTION_NAMED
7336 && block
->sect
->named
.name
7337 && (strcmp (block
->sect
->named
.name
, ".vtable_map_vars") == 0))
7338 handle_vtv_comdat_section (block
->sect
, block
->sect
->named
.decl
);
7340 switch_to_section (block
->sect
);
7342 assemble_align (block
->alignment
);
7344 /* Define the values of all anchors relative to the current section
7346 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7347 targetm
.asm_out
.output_anchor (symbol
);
7349 /* Output the objects themselves. */
7351 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7353 /* Move to the object's offset, padding with zeros if necessary. */
7354 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7355 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7356 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7358 desc
= SYMBOL_REF_CONSTANT (symbol
);
7359 /* Pass 1 for align as we have already laid out everything in the block.
7360 So aligning shouldn't be necessary. */
7361 output_constant_pool_1 (desc
, 1);
7362 offset
+= GET_MODE_SIZE (desc
->mode
);
7364 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7367 decl
= SYMBOL_REF_DECL (symbol
);
7368 assemble_constant_contents
7369 (DECL_INITIAL (decl
), XSTR (symbol
, 0), DECL_ALIGN (decl
));
7371 size
= get_constant_size (DECL_INITIAL (decl
));
7373 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7374 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7375 && asan_protect_global (DECL_INITIAL (decl
)))
7377 size
= asan_red_zone_size (size
);
7378 assemble_zeros (size
);
7385 decl
= SYMBOL_REF_DECL (symbol
);
7386 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7387 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7389 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7390 && asan_protect_global (decl
))
7392 size
= asan_red_zone_size (size
);
7393 assemble_zeros (size
);
7400 /* A callback for qsort to compare object_blocks. */
7403 output_object_block_compare (const void *x
, const void *y
)
7405 object_block
*p1
= *(object_block
* const*)x
;
7406 object_block
*p2
= *(object_block
* const*)y
;
7408 if (p1
->sect
->common
.flags
& SECTION_NAMED
7409 && !(p2
->sect
->common
.flags
& SECTION_NAMED
))
7412 if (!(p1
->sect
->common
.flags
& SECTION_NAMED
)
7413 && p2
->sect
->common
.flags
& SECTION_NAMED
)
7416 if (p1
->sect
->common
.flags
& SECTION_NAMED
7417 && p2
->sect
->common
.flags
& SECTION_NAMED
)
7418 return strcmp (p1
->sect
->named
.name
, p2
->sect
->named
.name
);
7420 unsigned f1
= p1
->sect
->common
.flags
;
7421 unsigned f2
= p2
->sect
->common
.flags
;
7424 return f1
< f2
? -1 : 1;
7427 /* Output the definitions of all object_blocks. */
7430 output_object_blocks (void)
7432 vec
<object_block
*, va_heap
> v
;
7433 v
.create (object_block_htab
->elements ());
7435 hash_table
<object_block_hasher
>::iterator hi
;
7437 FOR_EACH_HASH_TABLE_ELEMENT (*object_block_htab
, obj
, object_block
*, hi
)
7440 /* Sort them in order to output them in a deterministic manner,
7441 otherwise we may get .rodata sections in different orders with
7443 v
.qsort (output_object_block_compare
);
7445 FOR_EACH_VEC_ELT (v
, i
, obj
)
7446 output_object_block (obj
);
7451 /* This function provides a possible implementation of the
7452 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7453 by -frecord-gcc-switches it creates a new mergeable, string section in the
7454 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7455 contains the switches in ASCII format.
7457 FIXME: This code does not correctly handle double quote characters
7458 that appear inside strings, (it strips them rather than preserving them).
7459 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7460 characters - instead it treats them as sub-string separators. Since
7461 we want to emit NUL strings terminators into the object file we have to use
7465 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7469 case SWITCH_TYPE_PASSED
:
7470 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7471 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7474 case SWITCH_TYPE_DESCRIPTIVE
:
7477 /* Distinguish between invocations where name is NULL. */
7478 static bool started
= false;
7484 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7488 | (SECTION_ENTSIZE
& 1),
7490 switch_to_section (sec
);
7499 /* The return value is currently ignored by the caller, but must be 0.
7500 For -fverbose-asm the return value would be the number of characters
7501 emitted into the assembler file. */
7505 /* Emit text to declare externally defined symbols. It is needed to
7506 properly support non-default visibility. */
7508 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7510 const char *name ATTRIBUTE_UNUSED
)
7512 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7513 set in order to avoid putting out names that are never really
7514 used. Always output visibility specified in the source. */
7515 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7516 && (DECL_VISIBILITY_SPECIFIED (decl
)
7517 || targetm
.binds_local_p (decl
)))
7518 maybe_assemble_visibility (decl
);
7521 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7524 default_asm_output_source_filename (FILE *file
, const char *name
)
7526 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7527 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7529 fprintf (file
, "\t.file\t");
7530 output_quoted_string (file
, name
);
7535 /* Output a file name in the form wanted by System V. */
7538 output_file_directive (FILE *asm_file
, const char *input_name
)
7543 if (input_name
== NULL
)
7544 input_name
= "<stdin>";
7546 input_name
= remap_debug_filename (input_name
);
7548 len
= strlen (input_name
);
7549 na
= input_name
+ len
;
7551 /* NA gets INPUT_NAME sans directory names. */
7552 while (na
> input_name
)
7554 if (IS_DIR_SEPARATOR (na
[-1]))
7559 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7562 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7565 make_debug_expr_from_rtl (const_rtx exp
)
7567 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7568 machine_mode mode
= GET_MODE (exp
);
7571 DECL_ARTIFICIAL (ddecl
) = 1;
7572 if (REG_P (exp
) && REG_EXPR (exp
))
7573 type
= TREE_TYPE (REG_EXPR (exp
));
7574 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7575 type
= TREE_TYPE (MEM_EXPR (exp
));
7578 if (type
&& TYPE_MODE (type
) == mode
)
7579 TREE_TYPE (ddecl
) = type
;
7581 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7582 DECL_MODE (ddecl
) = mode
;
7583 dval
= gen_rtx_DEBUG_EXPR (mode
);
7584 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7585 SET_DECL_RTL (ddecl
, dval
);
7589 #ifdef ELF_ASCII_ESCAPES
7590 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7593 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7598 fputs (STRING_ASM_OP
, f
);
7603 escape
= ELF_ASCII_ESCAPES
[c
];
7611 putc ('0'+((c
>>6)&7), f
);
7612 putc ('0'+((c
>>3)&7), f
);
7613 putc ('0'+(c
&7), f
);
7626 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7629 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7631 const char *limit
= s
+ len
;
7632 const char *last_null
= NULL
;
7633 unsigned bytes_in_chunk
= 0;
7637 for (; s
< limit
; s
++)
7641 if (bytes_in_chunk
>= 60)
7650 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7657 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7659 if (bytes_in_chunk
> 0)
7666 default_elf_asm_output_limited_string (f
, s
);
7671 if (bytes_in_chunk
== 0)
7672 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7675 escape
= ELF_ASCII_ESCAPES
[c
];
7684 putc ('0'+((c
>>6)&7), f
);
7685 putc ('0'+((c
>>3)&7), f
);
7686 putc ('0'+(c
&7), f
);
7687 bytes_in_chunk
+= 4;
7692 bytes_in_chunk
+= 2;
7699 if (bytes_in_chunk
> 0)
7707 static GTY(()) section
*elf_init_array_section
;
7708 static GTY(()) section
*elf_fini_array_section
;
7711 get_elf_initfini_array_priority_section (int priority
,
7715 if (priority
!= DEFAULT_INIT_PRIORITY
)
7718 sprintf (buf
, "%s.%.5u",
7719 constructor_p
? ".init_array" : ".fini_array",
7721 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7727 if (elf_init_array_section
== NULL
)
7728 elf_init_array_section
7729 = get_section (".init_array",
7730 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7731 sec
= elf_init_array_section
;
7735 if (elf_fini_array_section
== NULL
)
7736 elf_fini_array_section
7737 = get_section (".fini_array",
7738 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7739 sec
= elf_fini_array_section
;
7745 /* Use .init_array section for constructors. */
7748 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7750 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7752 assemble_addr_to_section (symbol
, sec
);
7755 /* Use .fini_array section for destructors. */
7758 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7760 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7762 assemble_addr_to_section (symbol
, sec
);
7765 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7767 This is a bit of a cheat. The real default is a no-op, but this
7768 hook is the default for all targets with a .ident directive. */
7771 default_asm_output_ident_directive (const char *ident_str
)
7773 const char *ident_asm_op
= "\t.ident\t";
7775 /* If we are still in the front end, do not write out the string
7776 to asm_out_file. Instead, add a fake top-level asm statement.
7777 This allows the front ends to use this hook without actually
7778 writing to asm_out_file, to handle #ident or Pragma Ident. */
7779 if (symtab
->state
== PARSING
)
7781 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7782 symtab
->finalize_toplevel_asm (build_string (strlen (buf
), buf
));
7785 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7789 /* This function ensures that vtable_map variables are not only
7790 in the comdat section, but that each variable has its own unique
7791 comdat name. Without this the variables end up in the same section
7792 with a single comdat name.
7794 FIXME: resolve_unique_section needs to deal better with
7795 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
7796 that is fixed, this if-else statement can be replaced with
7797 a single call to "switch_to_section (sect)". */
7800 handle_vtv_comdat_section (section
*sect
, const_tree decl ATTRIBUTE_UNUSED
)
7802 #if defined (OBJECT_FORMAT_ELF)
7803 targetm
.asm_out
.named_section (sect
->named
.name
,
7804 sect
->named
.common
.flags
7809 /* Neither OBJECT_FORMAT_PE, nor OBJECT_FORMAT_COFF is set here.
7810 Therefore the following check is used.
7811 In case a the target is PE or COFF a comdat group section
7812 is created, e.g. .vtable_map_vars$foo. The linker places
7813 everything in .vtable_map_vars at the end.
7815 A fix could be made in
7816 gcc/config/i386/winnt.c: i386_pe_unique_section. */
7821 if (TREE_CODE (DECL_NAME (decl
)) == IDENTIFIER_NODE
)
7822 name
= ACONCAT ((sect
->named
.name
, "$",
7823 IDENTIFIER_POINTER (DECL_NAME (decl
)), NULL
));
7825 name
= ACONCAT ((sect
->named
.name
, "$",
7826 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (DECL_NAME (decl
))),
7829 targetm
.asm_out
.named_section (name
,
7830 sect
->named
.common
.flags
7836 switch_to_section (sect
);
7840 #include "gt-varasm.h"