1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987-2015 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
21 /* This file handles generation of all the assembler code
22 *except* the instructions of a function.
23 This includes declarations of variables and their initial values.
25 We also output the assembler code for constants stored in memory
26 and are responsible for combining constants with the same value. */
30 #include "coretypes.h"
34 #include "stor-layout.h"
35 #include "stringpool.h"
42 #include "hard-reg-set.h"
48 #include "diagnostic-core.h"
50 #include "langhooks.h"
54 #include "common/common-target.h"
55 #include "targhooks.h"
57 #include "dominance.h"
59 #include "basic-block.h"
62 #include "plugin-api.h"
67 #include "tree-chkp.h"
69 #ifdef XCOFF_DEBUGGING_INFO
70 #include "xcoffout.h" /* Needed for external data
71 declarations for e.g. AIX 4.x. */
74 /* The (assembler) name of the first globally-visible object output. */
75 extern GTY(()) const char *first_global_object_name
;
76 extern GTY(()) const char *weak_global_object_name
;
78 const char *first_global_object_name
;
79 const char *weak_global_object_name
;
82 struct constant_descriptor_rtx
;
83 struct rtx_constant_pool
;
85 #define n_deferred_constants (crtl->varasm.deferred_constants)
87 /* Number for making the label on the next
88 constant that is stored in memory. */
90 static GTY(()) int const_labelno
;
92 /* Carry information from ASM_DECLARE_OBJECT_NAME
93 to ASM_FINISH_DECLARE_OBJECT. */
95 int size_directive_output
;
97 /* The last decl for which assemble_variable was called,
98 if it did ASM_DECLARE_OBJECT_NAME.
99 If the last call to assemble_variable didn't do that,
102 tree last_assemble_variable_decl
;
104 /* The following global variable indicates if the first basic block
105 in a function belongs to the cold partition or not. */
107 bool first_function_block_is_cold
;
109 /* Whether we saw any functions with no_split_stack. */
111 static bool saw_no_split_stack
;
113 static const char *strip_reg_name (const char *);
114 static int contains_pointers_p (tree
);
115 #ifdef ASM_OUTPUT_EXTERNAL
116 static bool incorporeal_function_p (tree
);
118 static void decode_addr_const (tree
, struct addr_const
*);
119 static hashval_t
const_hash_1 (const tree
);
120 static int compare_constant (const tree
, const tree
);
121 static void output_constant_def_contents (rtx
);
122 static void output_addressed_constants (tree
);
123 static unsigned HOST_WIDE_INT
output_constant (tree
, unsigned HOST_WIDE_INT
,
125 static void globalize_decl (tree
);
126 static bool decl_readonly_section_1 (enum section_category
);
127 #ifdef BSS_SECTION_ASM_OP
128 #ifdef ASM_OUTPUT_ALIGNED_BSS
129 static void asm_output_aligned_bss (FILE *, tree
, const char *,
130 unsigned HOST_WIDE_INT
, int)
133 #endif /* BSS_SECTION_ASM_OP */
134 static void mark_weak (tree
);
135 static void output_constant_pool (const char *, tree
);
137 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
138 section
*text_section
;
139 section
*data_section
;
140 section
*readonly_data_section
;
141 section
*sdata_section
;
142 section
*ctors_section
;
143 section
*dtors_section
;
144 section
*bss_section
;
145 section
*sbss_section
;
147 /* Various forms of common section. All are guaranteed to be nonnull. */
148 section
*tls_comm_section
;
149 section
*comm_section
;
150 section
*lcomm_section
;
152 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
154 section
*bss_noswitch_section
;
156 /* The section that holds the main exception table, when known. The section
157 is set either by the target's init_sections hook or by the first call to
158 switch_to_exception_section. */
159 section
*exception_section
;
161 /* The section that holds the DWARF2 frame unwind information, when known.
162 The section is set either by the target's init_sections hook or by the
163 first call to switch_to_eh_frame_section. */
164 section
*eh_frame_section
;
166 /* asm_out_file's current section. This is NULL if no section has yet
167 been selected or if we lose track of what the current section is. */
170 /* True if code for the current function is currently being directed
171 at the cold section. */
172 bool in_cold_section_p
;
174 /* A linked list of all the unnamed sections. */
175 static GTY(()) section
*unnamed_sections
;
177 /* Return a nonzero value if DECL has a section attribute. */
178 #define IN_NAMED_SECTION(DECL) \
179 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
180 && DECL_SECTION_NAME (DECL) != NULL)
182 struct section_hasher
: ggc_hasher
<section
*>
184 typedef const char *compare_type
;
186 static hashval_t
hash (section
*);
187 static bool equal (section
*, const char *);
190 /* Hash table of named sections. */
191 static GTY(()) hash_table
<section_hasher
> *section_htab
;
193 struct object_block_hasher
: ggc_hasher
<object_block
*>
195 typedef const section
*compare_type
;
197 static hashval_t
hash (object_block
*);
198 static bool equal (object_block
*, const section
*);
201 /* A table of object_blocks, indexed by section. */
202 static GTY(()) hash_table
<object_block_hasher
> *object_block_htab
;
204 /* The next number to use for internal anchor labels. */
205 static GTY(()) int anchor_labelno
;
207 /* A pool of constants that can be shared between functions. */
208 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
210 /* Helper routines for maintaining section_htab. */
213 section_hasher::equal (section
*old
, const char *new_name
)
215 return strcmp (old
->named
.name
, new_name
) == 0;
219 section_hasher::hash (section
*old
)
221 return htab_hash_string (old
->named
.name
);
224 /* Return a hash value for section SECT. */
227 hash_section (section
*sect
)
229 if (sect
->common
.flags
& SECTION_NAMED
)
230 return htab_hash_string (sect
->named
.name
);
231 return sect
->common
.flags
;
234 /* Helper routines for maintaining object_block_htab. */
237 object_block_hasher::equal (object_block
*old
, const section
*new_section
)
239 return old
->sect
== new_section
;
243 object_block_hasher::hash (object_block
*old
)
245 return hash_section (old
->sect
);
248 /* Return a new unnamed section with the given fields. */
251 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
256 sect
= ggc_alloc
<section
> ();
257 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
258 sect
->unnamed
.callback
= callback
;
259 sect
->unnamed
.data
= data
;
260 sect
->unnamed
.next
= unnamed_sections
;
262 unnamed_sections
= sect
;
266 /* Return a SECTION_NOSWITCH section with the given fields. */
269 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
273 sect
= ggc_alloc
<section
> ();
274 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
275 sect
->noswitch
.callback
= callback
;
280 /* Return the named section structure associated with NAME. Create
281 a new section with the given fields if no such structure exists. */
284 get_section (const char *name
, unsigned int flags
, tree decl
)
286 section
*sect
, **slot
;
288 slot
= section_htab
->find_slot_with_hash (name
, htab_hash_string (name
),
290 flags
|= SECTION_NAMED
;
293 sect
= ggc_alloc
<section
> ();
294 sect
->named
.common
.flags
= flags
;
295 sect
->named
.name
= ggc_strdup (name
);
296 sect
->named
.decl
= decl
;
302 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
303 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
305 /* It is fine if one of the section flags is
306 SECTION_WRITE | SECTION_RELRO and the other has none of these
307 flags (i.e. read-only) in named sections and either the
308 section hasn't been declared yet or has been declared as writable.
309 In that case just make sure the resulting flags are
310 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
312 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
313 == (SECTION_WRITE
| SECTION_RELRO
)
314 && (sect
->common
.flags
315 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
316 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
317 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
318 || (sect
->common
.flags
& SECTION_WRITE
)))
320 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
323 /* Sanity check user variables for flag changes. */
324 if (sect
->named
.decl
!= NULL
325 && DECL_P (sect
->named
.decl
)
326 && decl
!= sect
->named
.decl
)
328 if (decl
!= NULL
&& DECL_P (decl
))
329 error ("%+D causes a section type conflict with %D",
330 decl
, sect
->named
.decl
);
332 error ("section type conflict with %D", sect
->named
.decl
);
333 inform (DECL_SOURCE_LOCATION (sect
->named
.decl
),
334 "%qD was declared here", sect
->named
.decl
);
336 else if (decl
!= NULL
&& DECL_P (decl
))
337 error ("%+D causes a section type conflict", decl
);
339 error ("section type conflict");
340 /* Make sure we don't error about one section multiple times. */
341 sect
->common
.flags
|= SECTION_OVERRIDE
;
347 /* Return true if the current compilation mode benefits from having
348 objects grouped into blocks. */
351 use_object_blocks_p (void)
353 return flag_section_anchors
;
356 /* Return the object_block structure for section SECT. Create a new
357 structure if we haven't created one already. Return null if SECT
360 static struct object_block
*
361 get_block_for_section (section
*sect
)
363 struct object_block
*block
;
369 = object_block_htab
->find_slot_with_hash (sect
, hash_section (sect
),
374 block
= ggc_cleared_alloc
<object_block
> ();
381 /* Create a symbol with label LABEL and place it at byte offset
382 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
383 is not yet known. LABEL must be a garbage-collected string. */
386 create_block_symbol (const char *label
, struct object_block
*block
,
387 HOST_WIDE_INT offset
)
392 /* Create the extended SYMBOL_REF. */
393 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
394 symbol
= (rtx
) ggc_internal_alloc (size
);
396 /* Initialize the normal SYMBOL_REF fields. */
397 memset (symbol
, 0, size
);
398 PUT_CODE (symbol
, SYMBOL_REF
);
399 PUT_MODE (symbol
, Pmode
);
400 XSTR (symbol
, 0) = label
;
401 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
403 /* Initialize the block_symbol stuff. */
404 SYMBOL_REF_BLOCK (symbol
) = block
;
405 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
410 /* Return a section with a particular name and with whatever SECTION_*
411 flags section_type_flags deems appropriate. The name of the section
412 is taken from NAME if nonnull, otherwise it is taken from DECL's
413 DECL_SECTION_NAME. DECL is the decl associated with the section
414 (see the section comment for details) and RELOC is as for
415 section_type_flags. */
418 get_named_section (tree decl
, const char *name
, int reloc
)
424 gcc_assert (decl
&& DECL_P (decl
) && DECL_SECTION_NAME (decl
));
425 name
= DECL_SECTION_NAME (decl
);
428 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
429 return get_section (name
, flags
, decl
);
432 /* Worker for resolve_unique_section. */
435 set_implicit_section (struct symtab_node
*n
, void *data ATTRIBUTE_UNUSED
)
437 n
->implicit_section
= true;
441 /* If required, set DECL_SECTION_NAME to a unique name. */
444 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
445 int flag_function_or_data_sections
)
447 if (DECL_SECTION_NAME (decl
) == NULL
448 && targetm_common
.have_named_sections
449 && (flag_function_or_data_sections
450 || DECL_COMDAT_GROUP (decl
)))
452 targetm
.asm_out
.unique_section (decl
, reloc
);
453 if (DECL_SECTION_NAME (decl
))
454 symtab_node::get (decl
)->call_for_symbol_and_aliases
455 (set_implicit_section
, NULL
, true);
459 #ifdef BSS_SECTION_ASM_OP
461 #ifdef ASM_OUTPUT_ALIGNED_BSS
463 /* Utility function for targets to use in implementing
464 ASM_OUTPUT_ALIGNED_BSS.
465 ??? It is believed that this function will work in most cases so such
466 support is localized here. */
469 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
470 const char *name
, unsigned HOST_WIDE_INT size
,
473 switch_to_section (bss_section
);
474 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
475 #ifdef ASM_DECLARE_OBJECT_NAME
476 last_assemble_variable_decl
= decl
;
477 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
479 /* Standard thing is just output label for the object. */
480 ASM_OUTPUT_LABEL (file
, name
);
481 #endif /* ASM_DECLARE_OBJECT_NAME */
482 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
487 #endif /* BSS_SECTION_ASM_OP */
489 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
490 /* Return the hot section for function DECL. Return text_section for
494 hot_function_section (tree decl
)
496 if (decl
!= NULL_TREE
497 && DECL_SECTION_NAME (decl
) != NULL
498 && targetm_common
.have_named_sections
)
499 return get_named_section (decl
, NULL
, 0);
505 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
508 When DECL_SECTION_NAME is non-NULL and it is implicit section and
509 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
510 concatenate the name with NAMED_SECTION_SUFFIX.
511 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
514 get_named_text_section (tree decl
,
515 const char *text_section_name
,
516 const char *named_section_suffix
)
518 if (decl
&& DECL_SECTION_NAME (decl
))
520 if (named_section_suffix
)
522 const char *dsn
= DECL_SECTION_NAME (decl
);
523 const char *stripped_name
;
526 name
= (char *) alloca (strlen (dsn
) + 1);
530 stripped_name
= targetm
.strip_name_encoding (name
);
532 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
533 return get_named_section (decl
, buffer
, 0);
535 else if (symtab_node::get (decl
)->implicit_section
)
539 /* Do not try to split gnu_linkonce functions. This gets somewhat
541 if (DECL_COMDAT_GROUP (decl
) && !HAVE_COMDAT_GROUP
)
543 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
544 name
= targetm
.strip_name_encoding (name
);
545 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
551 return get_named_section (decl
, text_section_name
, 0);
554 /* Choose named function section based on its frequency. */
557 default_function_section (tree decl
, enum node_frequency freq
,
558 bool startup
, bool exit
)
560 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
561 /* Old GNU linkers have buggy --gc-section support, which sometimes
562 results in .gcc_except_table* sections being garbage collected. */
564 && symtab_node::get (decl
)->implicit_section
)
568 if (!flag_reorder_functions
569 || !targetm_common
.have_named_sections
)
571 /* Startup code should go to startup subsection unless it is
572 unlikely executed (this happens especially with function splitting
573 where we can split away unnecessary parts of static constructors. */
574 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
576 /* If we do have a profile or(and) LTO phase is executed, we do not need
577 these ELF section. */
578 if (!in_lto_p
|| !flag_profile_values
)
579 return get_named_text_section (decl
, ".text.startup", NULL
);
584 /* Similarly for exit. */
585 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
586 return get_named_text_section (decl
, ".text.exit", NULL
);
588 /* Group cold functions together, similarly for hot code. */
591 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
592 return get_named_text_section (decl
, ".text.unlikely", NULL
);
593 case NODE_FREQUENCY_HOT
:
594 /* If we do have a profile or(and) LTO phase is executed, we do not need
595 these ELF section. */
596 if (!in_lto_p
|| !flag_profile_values
)
597 return get_named_text_section (decl
, ".text.hot", NULL
);
603 /* Return the section for function DECL.
605 If DECL is NULL_TREE, return the text section. We can be passed
606 NULL_TREE under some circumstances by dbxout.c at least.
608 If FORCE_COLD is true, return cold function section ignoring
609 the frequency info of cgraph_node. */
612 function_section_1 (tree decl
, bool force_cold
)
614 section
*section
= NULL
;
615 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
616 bool startup
= false, exit
= false;
620 struct cgraph_node
*node
= cgraph_node::get (decl
);
624 freq
= node
->frequency
;
625 startup
= node
->only_called_at_startup
;
626 exit
= node
->only_called_at_exit
;
630 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
632 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
633 if (decl
!= NULL_TREE
634 && DECL_SECTION_NAME (decl
) != NULL
)
636 if (targetm
.asm_out
.function_section
)
637 section
= targetm
.asm_out
.function_section (decl
, freq
,
641 return get_named_section (decl
, NULL
, 0);
644 return targetm
.asm_out
.select_section
645 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
648 if (targetm
.asm_out
.function_section
)
649 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
652 return hot_function_section (decl
);
656 /* Return the section for function DECL.
658 If DECL is NULL_TREE, return the text section. We can be passed
659 NULL_TREE under some circumstances by dbxout.c at least. */
662 function_section (tree decl
)
664 /* Handle cases where function splitting code decides
665 to put function entry point into unlikely executed section
666 despite the fact that the function itself is not cold
667 (i.e. it is called rarely but contains a hot loop that is
668 better to live in hot subsection for the code locality). */
669 return function_section_1 (decl
,
670 first_function_block_is_cold
);
673 /* Return the section for the current function, take IN_COLD_SECTION_P
677 current_function_section (void)
679 return function_section_1 (current_function_decl
, in_cold_section_p
);
682 /* Tell assembler to switch to unlikely-to-be-executed text section. */
685 unlikely_text_section (void)
687 return function_section_1 (current_function_decl
, true);
690 /* When called within a function context, return true if the function
691 has been assigned a cold text section and if SECT is that section.
692 When called outside a function context, return true if SECT is the
693 default cold section. */
696 unlikely_text_section_p (section
*sect
)
698 return sect
== function_section_1 (current_function_decl
, true);
701 /* Return the read-only data section associated with function DECL. */
704 default_function_rodata_section (tree decl
)
706 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
708 const char *name
= DECL_SECTION_NAME (decl
);
710 if (DECL_COMDAT_GROUP (decl
) && HAVE_COMDAT_GROUP
)
716 dot
= strchr (name
+ 1, '.');
719 len
= strlen (dot
) + 8;
720 rname
= (char *) alloca (len
);
722 strcpy (rname
, ".rodata");
724 return get_section (rname
, SECTION_LINKONCE
, decl
);
726 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
727 else if (DECL_COMDAT_GROUP (decl
)
728 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
730 size_t len
= strlen (name
) + 1;
731 char *rname
= (char *) alloca (len
);
733 memcpy (rname
, name
, len
);
735 return get_section (rname
, SECTION_LINKONCE
, decl
);
737 /* For .text.foo we want to use .rodata.foo. */
738 else if (flag_function_sections
&& flag_data_sections
739 && strncmp (name
, ".text.", 6) == 0)
741 size_t len
= strlen (name
) + 1;
742 char *rname
= (char *) alloca (len
+ 2);
744 memcpy (rname
, ".rodata", 7);
745 memcpy (rname
+ 7, name
+ 5, len
- 5);
746 return get_section (rname
, 0, decl
);
750 return readonly_data_section
;
753 /* Return the read-only data section associated with function DECL
754 for targets where that section should be always the single
755 readonly data section. */
758 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
760 return readonly_data_section
;
763 /* Return the section to use for string merging. */
766 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
767 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
768 unsigned int flags ATTRIBUTE_UNUSED
)
772 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
773 && TREE_CODE (decl
) == STRING_CST
774 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
776 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
777 && TREE_STRING_LENGTH (decl
) >= len
)
780 unsigned int modesize
;
784 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
785 char *name
= (char *) alloca (strlen (prefix
) + 30);
787 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
788 modesize
= GET_MODE_BITSIZE (mode
);
789 if (modesize
>= 8 && modesize
<= 256
790 && (modesize
& (modesize
- 1)) == 0)
792 if (align
< modesize
)
795 str
= TREE_STRING_POINTER (decl
);
796 unit
= GET_MODE_SIZE (mode
);
798 /* Check for embedded NUL characters. */
799 for (i
= 0; i
< len
; i
+= unit
)
801 for (j
= 0; j
< unit
; j
++)
802 if (str
[i
+ j
] != '\0')
809 sprintf (name
, "%s.str%d.%d", prefix
,
810 modesize
/ 8, (int) (align
/ 8));
811 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
812 return get_section (name
, flags
, NULL
);
817 return readonly_data_section
;
820 /* Return the section to use for constant merging. */
823 mergeable_constant_section (machine_mode mode ATTRIBUTE_UNUSED
,
824 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
825 unsigned int flags ATTRIBUTE_UNUSED
)
827 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
829 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
835 && (align
& (align
- 1)) == 0)
837 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
838 char *name
= (char *) alloca (strlen (prefix
) + 30);
840 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
841 flags
|= (align
/ 8) | SECTION_MERGE
;
842 return get_section (name
, flags
, NULL
);
844 return readonly_data_section
;
847 /* Given NAME, a putative register name, discard any customary prefixes. */
850 strip_reg_name (const char *name
)
852 #ifdef REGISTER_PREFIX
853 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
854 name
+= strlen (REGISTER_PREFIX
);
856 if (name
[0] == '%' || name
[0] == '#')
861 /* The user has asked for a DECL to have a particular name. Set (or
862 change) it in such a way that we don't prefix an underscore to
865 set_user_assembler_name (tree decl
, const char *name
)
867 char *starred
= (char *) alloca (strlen (name
) + 2);
869 strcpy (starred
+ 1, name
);
870 symtab
->change_decl_assembler_name (decl
, get_identifier (starred
));
871 SET_DECL_RTL (decl
, NULL_RTX
);
874 /* Decode an `asm' spec for a declaration as a register name.
875 Return the register number, or -1 if nothing specified,
876 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
877 or -3 if ASMSPEC is `cc' and is not recognized,
878 or -4 if ASMSPEC is `memory' and is not recognized.
879 Accept an exact spelling or a decimal number.
880 Prefixes such as % are optional. */
883 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
885 /* Presume just one register is clobbered. */
892 /* Get rid of confusing prefixes. */
893 asmspec
= strip_reg_name (asmspec
);
895 /* Allow a decimal number as a "register name". */
896 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
897 if (! ISDIGIT (asmspec
[i
]))
899 if (asmspec
[0] != 0 && i
< 0)
902 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0 && reg_names
[i
][0])
908 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
910 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
913 #ifdef OVERLAPPING_REGISTER_NAMES
917 const char *const name
;
920 } table
[] = OVERLAPPING_REGISTER_NAMES
;
922 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
924 && ! strcmp (asmspec
, table
[i
].name
))
926 *pnregs
= table
[i
].nregs
;
927 return table
[i
].number
;
930 #endif /* OVERLAPPING_REGISTER_NAMES */
932 #ifdef ADDITIONAL_REGISTER_NAMES
934 static const struct { const char *const name
; const int number
; } table
[]
935 = ADDITIONAL_REGISTER_NAMES
;
937 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
939 && ! strcmp (asmspec
, table
[i
].name
)
940 && reg_names
[table
[i
].number
][0])
941 return table
[i
].number
;
943 #endif /* ADDITIONAL_REGISTER_NAMES */
945 if (!strcmp (asmspec
, "memory"))
948 if (!strcmp (asmspec
, "cc"))
958 decode_reg_name (const char *name
)
961 return decode_reg_name_and_count (name
, &count
);
965 /* Return true if DECL's initializer is suitable for a BSS section. */
968 bss_initializer_p (const_tree decl
)
970 return (DECL_INITIAL (decl
) == NULL
971 /* In LTO we have no errors in program; error_mark_node is used
972 to mark offlined constructors. */
973 || (DECL_INITIAL (decl
) == error_mark_node
975 || (flag_zero_initialized_in_bss
976 /* Leave constant zeroes in .rodata so they
978 && !TREE_READONLY (decl
)
979 && initializer_zerop (DECL_INITIAL (decl
))));
982 /* Compute the alignment of variable specified by DECL.
983 DONT_OUTPUT_DATA is from assemble_variable. */
986 align_variable (tree decl
, bool dont_output_data
)
988 unsigned int align
= DECL_ALIGN (decl
);
990 /* In the case for initialing an array whose length isn't specified,
991 where we have not yet been able to do the layout,
992 figure out the proper alignment now. */
993 if (dont_output_data
&& DECL_SIZE (decl
) == 0
994 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
995 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
997 /* Some object file formats have a maximum alignment which they support.
998 In particular, a.out format supports a maximum alignment of 4. */
999 if (align
> MAX_OFILE_ALIGNMENT
)
1001 error ("alignment of %q+D is greater than maximum object "
1002 "file alignment %d", decl
,
1003 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
1004 align
= MAX_OFILE_ALIGNMENT
;
1007 if (! DECL_USER_ALIGN (decl
))
1009 #ifdef DATA_ABI_ALIGNMENT
1010 unsigned int data_abi_align
1011 = DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1012 /* For backwards compatibility, don't assume the ABI alignment for
1014 if (! DECL_THREAD_LOCAL_P (decl
) || data_abi_align
<= BITS_PER_WORD
)
1015 align
= data_abi_align
;
1018 /* On some machines, it is good to increase alignment sometimes.
1019 But as DECL_ALIGN is used both for actually emitting the variable
1020 and for code accessing the variable as guaranteed alignment, we
1021 can only increase the alignment if it is a performance optimization
1022 if the references to it must bind to the current definition. */
1023 if (decl_binds_to_current_def_p (decl
)
1024 && !DECL_VIRTUAL_P (decl
))
1026 #ifdef DATA_ALIGNMENT
1027 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1028 /* Don't increase alignment too much for TLS variables - TLS space
1030 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1033 #ifdef CONSTANT_ALIGNMENT
1034 if (DECL_INITIAL (decl
) != 0
1035 /* In LTO we have no errors in program; error_mark_node is used
1036 to mark offlined constructors. */
1037 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1039 unsigned int const_align
1040 = CONSTANT_ALIGNMENT (DECL_INITIAL (decl
), align
);
1041 /* Don't increase alignment too much for TLS variables - TLS
1042 space is too precious. */
1043 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1044 align
= const_align
;
1050 /* Reset the alignment in case we have made it tighter, so we can benefit
1051 from it in get_pointer_alignment. */
1052 DECL_ALIGN (decl
) = align
;
1055 /* Return DECL_ALIGN (decl), possibly increased for optimization purposes
1056 beyond what align_variable returned. */
1059 get_variable_align (tree decl
)
1061 unsigned int align
= DECL_ALIGN (decl
);
1063 /* For user aligned vars or static vars align_variable already did
1065 if (DECL_USER_ALIGN (decl
) || !TREE_PUBLIC (decl
))
1068 #ifdef DATA_ABI_ALIGNMENT
1069 if (DECL_THREAD_LOCAL_P (decl
))
1070 align
= DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1073 /* For decls that bind to the current definition, align_variable
1074 did also everything, except for not assuming ABI required alignment
1075 of TLS variables. For other vars, increase the alignment here
1076 as an optimization. */
1077 if (!decl_binds_to_current_def_p (decl
))
1079 /* On some machines, it is good to increase alignment sometimes. */
1080 #ifdef DATA_ALIGNMENT
1081 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1082 /* Don't increase alignment too much for TLS variables - TLS space
1084 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1087 #ifdef CONSTANT_ALIGNMENT
1088 if (DECL_INITIAL (decl
) != 0
1089 /* In LTO we have no errors in program; error_mark_node is used
1090 to mark offlined constructors. */
1091 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1093 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
1095 /* Don't increase alignment too much for TLS variables - TLS space
1097 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1098 align
= const_align
;
1106 /* Return the section into which the given VAR_DECL or CONST_DECL
1107 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1108 section should be used wherever possible. */
1111 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1113 addr_space_t as
= ADDR_SPACE_GENERIC
;
1115 varpool_node
*vnode
= varpool_node::get (decl
);
1118 vnode
= vnode
->ultimate_alias_target ();
1122 if (TREE_TYPE (decl
) != error_mark_node
)
1123 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1125 /* We need the constructor to figure out reloc flag. */
1127 vnode
->get_constructor ();
1129 if (DECL_COMMON (decl
))
1131 /* If the decl has been given an explicit section name, or it resides
1132 in a non-generic address space, then it isn't common, and shouldn't
1133 be handled as such. */
1134 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1135 && ADDR_SPACE_GENERIC_P (as
));
1136 if (DECL_THREAD_LOCAL_P (decl
))
1137 return tls_comm_section
;
1138 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1139 return comm_section
;
1142 if (DECL_INITIAL (decl
) == error_mark_node
)
1143 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1144 else if (DECL_INITIAL (decl
))
1145 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1149 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1150 if (IN_NAMED_SECTION (decl
))
1151 return get_named_section (decl
, NULL
, reloc
);
1153 if (ADDR_SPACE_GENERIC_P (as
)
1154 && !DECL_THREAD_LOCAL_P (decl
)
1155 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1156 && bss_initializer_p (decl
))
1158 if (!TREE_PUBLIC (decl
)
1159 && !((flag_sanitize
& SANITIZE_ADDRESS
)
1160 && asan_protect_global (decl
)))
1161 return lcomm_section
;
1162 if (bss_noswitch_section
)
1163 return bss_noswitch_section
;
1166 return targetm
.asm_out
.select_section (decl
, reloc
,
1167 get_variable_align (decl
));
1170 /* Return the block into which object_block DECL should be placed. */
1172 static struct object_block
*
1173 get_block_for_decl (tree decl
)
1177 if (TREE_CODE (decl
) == VAR_DECL
)
1179 /* The object must be defined in this translation unit. */
1180 if (DECL_EXTERNAL (decl
))
1183 /* There's no point using object blocks for something that is
1184 isolated by definition. */
1185 if (DECL_COMDAT_GROUP (decl
))
1189 /* We can only calculate block offsets if the decl has a known
1191 if (DECL_SIZE_UNIT (decl
) == NULL
)
1193 if (!tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
)))
1196 /* Find out which section should contain DECL. We cannot put it into
1197 an object block if it requires a standalone definition. */
1198 if (TREE_CODE (decl
) == VAR_DECL
)
1199 align_variable (decl
, 0);
1200 sect
= get_variable_section (decl
, true);
1201 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1204 return get_block_for_section (sect
);
1207 /* Make sure block symbol SYMBOL is in block BLOCK. */
1210 change_symbol_block (rtx symbol
, struct object_block
*block
)
1212 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1214 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1215 SYMBOL_REF_BLOCK (symbol
) = block
;
1219 /* Return true if it is possible to put DECL in an object_block. */
1222 use_blocks_for_decl_p (tree decl
)
1224 struct symtab_node
*snode
;
1226 /* Only data DECLs can be placed into object blocks. */
1227 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1230 /* Detect decls created by dw2_force_const_mem. Such decls are
1231 special because DECL_INITIAL doesn't specify the decl's true value.
1232 dw2_output_indirect_constants will instead call assemble_variable
1233 with dont_output_data set to 1 and then print the contents itself. */
1234 if (DECL_INITIAL (decl
) == decl
)
1237 /* If this decl is an alias, then we don't want to emit a
1239 if (TREE_CODE (decl
) == VAR_DECL
1240 && (snode
= symtab_node::get (decl
)) != NULL
1244 return targetm
.use_blocks_for_decl_p (decl
);
1247 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
1248 until we find an identifier that is not itself a transparent alias.
1249 Modify the alias passed to it by reference (and all aliases on the
1250 way to the ultimate target), such that they do not have to be
1251 followed again, and return the ultimate target of the alias
1255 ultimate_transparent_alias_target (tree
*alias
)
1257 tree target
= *alias
;
1259 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
1261 gcc_assert (TREE_CHAIN (target
));
1262 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
1263 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
1264 && ! TREE_CHAIN (target
));
1271 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1272 have static storage duration. In other words, it should not be an
1273 automatic variable, including PARM_DECLs.
1275 There is, however, one exception: this function handles variables
1276 explicitly placed in a particular register by the user.
1278 This is never called for PARM_DECL nodes. */
1281 make_decl_rtl (tree decl
)
1283 const char *name
= 0;
1288 /* Check that we are not being given an automatic variable. */
1289 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1290 && TREE_CODE (decl
) != RESULT_DECL
);
1292 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1293 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1294 || TREE_STATIC (decl
)
1295 || TREE_PUBLIC (decl
)
1296 || DECL_EXTERNAL (decl
)
1297 || DECL_REGISTER (decl
));
1299 /* And that we were not given a type or a label. */
1300 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1301 && TREE_CODE (decl
) != LABEL_DECL
);
1303 /* For a duplicate declaration, we can be called twice on the
1304 same DECL node. Don't discard the RTL already made. */
1305 if (DECL_RTL_SET_P (decl
))
1307 /* If the old RTL had the wrong mode, fix the mode. */
1308 x
= DECL_RTL (decl
);
1309 if (GET_MODE (x
) != DECL_MODE (decl
))
1310 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1312 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1315 /* ??? Another way to do this would be to maintain a hashed
1316 table of such critters. Instead of adding stuff to a DECL
1317 to give certain attributes to it, we could use an external
1318 hash map from DECL to set of attributes. */
1320 /* Let the target reassign the RTL if it wants.
1321 This is necessary, for example, when one machine specific
1322 decl attribute overrides another. */
1323 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1325 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1326 on the new decl information. */
1328 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1329 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1330 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1335 /* If this variable belongs to the global constant pool, retrieve the
1336 pre-computed RTL or recompute it in LTO mode. */
1337 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_IN_CONSTANT_POOL (decl
))
1339 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1343 id
= DECL_ASSEMBLER_NAME (decl
);
1344 if (TREE_CODE (decl
) == FUNCTION_DECL
1345 && cgraph_node::get (decl
)
1346 && cgraph_node::get (decl
)->instrumentation_clone
)
1347 ultimate_transparent_alias_target (&id
);
1348 name
= IDENTIFIER_POINTER (id
);
1350 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1351 && DECL_REGISTER (decl
))
1353 error ("register name not specified for %q+D", decl
);
1355 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1357 const char *asmspec
= name
+1;
1358 machine_mode mode
= DECL_MODE (decl
);
1359 reg_number
= decode_reg_name (asmspec
);
1360 /* First detect errors in declaring global registers. */
1361 if (reg_number
== -1)
1362 error ("register name not specified for %q+D", decl
);
1363 else if (reg_number
< 0)
1364 error ("invalid register name for %q+D", decl
);
1365 else if (mode
== BLKmode
)
1366 error ("data type of %q+D isn%'t suitable for a register",
1368 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1369 error ("the register specified for %q+D cannot be accessed"
1370 " by the current target", decl
);
1371 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1372 error ("the register specified for %q+D is not general enough"
1373 " to be used as a register variable", decl
);
1374 else if (!HARD_REGNO_MODE_OK (reg_number
, mode
))
1375 error ("register specified for %q+D isn%'t suitable for data type",
1377 /* Now handle properly declared static register variables. */
1382 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1384 DECL_INITIAL (decl
) = 0;
1385 error ("global register variable has initial value");
1387 if (TREE_THIS_VOLATILE (decl
))
1388 warning (OPT_Wvolatile_register_var
,
1389 "optimization may eliminate reads and/or "
1390 "writes to register variables");
1392 /* If the user specified one of the eliminables registers here,
1393 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1394 confused with that register and be eliminated. This usage is
1395 somewhat suspect... */
1397 SET_DECL_RTL (decl
, gen_rtx_raw_REG (mode
, reg_number
));
1398 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1399 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1401 if (TREE_STATIC (decl
))
1403 /* Make this register global, so not usable for anything
1405 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1406 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1407 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1409 nregs
= hard_regno_nregs
[reg_number
][mode
];
1411 globalize_reg (decl
, reg_number
+ --nregs
);
1414 /* As a register variable, it has no section. */
1417 /* Avoid internal errors from invalid register
1419 SET_DECL_ASSEMBLER_NAME (decl
, NULL_TREE
);
1420 DECL_HARD_REGISTER (decl
) = 0;
1423 /* Now handle ordinary static variables and functions (in memory).
1424 Also handle vars declared register invalidly. */
1425 else if (name
[0] == '*')
1427 #ifdef REGISTER_PREFIX
1428 if (strlen (REGISTER_PREFIX
) != 0)
1430 reg_number
= decode_reg_name (name
);
1431 if (reg_number
>= 0 || reg_number
== -3)
1432 error ("register name given for non-register variable %q+D", decl
);
1437 /* Specifying a section attribute on a variable forces it into a
1438 non-.bss section, and thus it cannot be common. */
1439 /* FIXME: In general this code should not be necessary because
1440 visibility pass is doing the same work. But notice_global_symbol
1441 is called early and it needs to make DECL_RTL to get the name.
1442 we take care of recomputing the DECL_RTL after visibility is changed. */
1443 if (TREE_CODE (decl
) == VAR_DECL
1444 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
))
1445 && DECL_SECTION_NAME (decl
) != NULL
1446 && DECL_INITIAL (decl
) == NULL_TREE
1447 && DECL_COMMON (decl
))
1448 DECL_COMMON (decl
) = 0;
1450 /* Variables can't be both common and weak. */
1451 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1452 DECL_COMMON (decl
) = 0;
1454 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1455 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1458 machine_mode address_mode
= Pmode
;
1459 if (TREE_TYPE (decl
) != error_mark_node
)
1461 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1462 address_mode
= targetm
.addr_space
.address_mode (as
);
1464 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1466 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1467 SET_SYMBOL_REF_DECL (x
, decl
);
1469 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1470 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1471 set_mem_attributes (x
, decl
, 1);
1472 SET_DECL_RTL (decl
, x
);
1474 /* Optionally set flags or add text to the name to record information
1475 such as that it is a function name.
1476 If the name is changed, the macro ASM_OUTPUT_LABELREF
1477 will have to know how to strip this information. */
1478 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1481 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1482 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1486 make_decl_rtl_for_debug (tree decl
)
1488 unsigned int save_aliasing_flag
;
1491 if (DECL_RTL_SET_P (decl
))
1492 return DECL_RTL (decl
);
1494 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1495 call new_alias_set. If running with -fcompare-debug, sometimes
1496 we do not want to create alias sets that will throw the alias
1497 numbers off in the comparison dumps. So... clearing
1498 flag_strict_aliasing will keep new_alias_set() from creating a
1500 save_aliasing_flag
= flag_strict_aliasing
;
1501 flag_strict_aliasing
= 0;
1503 rtl
= DECL_RTL (decl
);
1504 /* Reset DECL_RTL back, as various parts of the compiler expects
1505 DECL_RTL set meaning it is actually going to be output. */
1506 SET_DECL_RTL (decl
, NULL
);
1508 flag_strict_aliasing
= save_aliasing_flag
;
1512 /* Output a string of literal assembler code
1513 for an `asm' keyword used between functions. */
1516 assemble_asm (tree string
)
1521 if (TREE_CODE (string
) == ADDR_EXPR
)
1522 string
= TREE_OPERAND (string
, 0);
1524 p
= TREE_STRING_POINTER (string
);
1525 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1528 /* Write the address of the entity given by SYMBOL to SEC. */
1530 assemble_addr_to_section (rtx symbol
, section
*sec
)
1532 switch_to_section (sec
);
1533 assemble_align (POINTER_SIZE
);
1534 assemble_integer (symbol
, POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
1537 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1538 not) section for PRIORITY. */
1540 get_cdtor_priority_section (int priority
, bool constructor_p
)
1544 /* ??? This only works reliably with the GNU linker. */
1545 sprintf (buf
, "%s.%.5u",
1546 constructor_p
? ".ctors" : ".dtors",
1547 /* Invert the numbering so the linker puts us in the proper
1548 order; constructors are run from right to left, and the
1549 linker sorts in increasing order. */
1550 MAX_INIT_PRIORITY
- priority
);
1551 return get_section (buf
, SECTION_WRITE
, NULL
);
1555 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1559 if (priority
!= DEFAULT_INIT_PRIORITY
)
1560 sec
= get_cdtor_priority_section (priority
,
1561 /*constructor_p=*/false);
1563 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1565 assemble_addr_to_section (symbol
, sec
);
1568 #ifdef DTORS_SECTION_ASM_OP
1570 default_dtor_section_asm_out_destructor (rtx symbol
,
1571 int priority ATTRIBUTE_UNUSED
)
1573 assemble_addr_to_section (symbol
, dtors_section
);
1578 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1582 if (priority
!= DEFAULT_INIT_PRIORITY
)
1583 sec
= get_cdtor_priority_section (priority
,
1584 /*constructor_p=*/true);
1586 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1588 assemble_addr_to_section (symbol
, sec
);
1591 #ifdef CTORS_SECTION_ASM_OP
1593 default_ctor_section_asm_out_constructor (rtx symbol
,
1594 int priority ATTRIBUTE_UNUSED
)
1596 assemble_addr_to_section (symbol
, ctors_section
);
1600 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1601 a nonzero value if the constant pool should be output before the
1602 start of the function, or a zero value if the pool should output
1603 after the end of the function. The default is to put it before the
1606 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1607 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1610 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1611 to be output to assembler.
1612 Set first_global_object_name and weak_global_object_name as appropriate. */
1615 notice_global_symbol (tree decl
)
1617 const char **type
= &first_global_object_name
;
1619 if (first_global_object_name
1620 || !TREE_PUBLIC (decl
)
1621 || DECL_EXTERNAL (decl
)
1622 || !DECL_NAME (decl
)
1623 || (TREE_CODE (decl
) != FUNCTION_DECL
1624 && (TREE_CODE (decl
) != VAR_DECL
1625 || (DECL_COMMON (decl
)
1626 && (DECL_INITIAL (decl
) == 0
1627 || DECL_INITIAL (decl
) == error_mark_node
))))
1628 || !MEM_P (DECL_RTL (decl
)))
1631 /* We win when global object is found, but it is useful to know about weak
1632 symbol as well so we can produce nicer unique names. */
1633 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1634 type
= &weak_global_object_name
;
1640 rtx decl_rtl
= DECL_RTL (decl
);
1642 p
= targetm
.strip_name_encoding (XSTR (XEXP (decl_rtl
, 0), 0));
1643 name
= ggc_strdup (p
);
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
);
1714 crtl
->subsections
.hot_section_label
= NULL
;
1715 crtl
->subsections
.cold_section_label
= NULL
;
1716 crtl
->subsections
.hot_section_end_label
= NULL
;
1717 crtl
->subsections
.cold_section_end_label
= NULL
;
1720 /* The following code does not need preprocessing in the assembler. */
1724 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1725 output_constant_pool (fnname
, decl
);
1727 /* Make sure the not and cold text (code) sections are properly
1728 aligned. This is necessary here in the case where the function
1729 has both hot and cold sections, because we don't want to re-set
1730 the alignment when the section switch happens mid-function. */
1732 if (flag_reorder_blocks_and_partition
)
1734 first_function_block_is_cold
= false;
1736 switch_to_section (unlikely_text_section ());
1737 assemble_align (DECL_ALIGN (decl
));
1738 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1740 /* When the function starts with a cold section, we need to explicitly
1741 align the hot section and write out the hot section label.
1742 But if the current function is a thunk, we do not have a CFG. */
1744 && BB_PARTITION (ENTRY_BLOCK_PTR_FOR_FN (cfun
)->next_bb
) == BB_COLD_PARTITION
)
1746 switch_to_section (text_section
);
1747 assemble_align (DECL_ALIGN (decl
));
1748 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1749 hot_label_written
= true;
1750 first_function_block_is_cold
= true;
1752 in_cold_section_p
= first_function_block_is_cold
;
1756 /* Switch to the correct text section for the start of the function. */
1758 switch_to_section (function_section (decl
));
1759 if (flag_reorder_blocks_and_partition
1760 && !hot_label_written
)
1761 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1763 /* Tell assembler to move to target machine's alignment for functions. */
1764 align
= floor_log2 (DECL_ALIGN (decl
) / BITS_PER_UNIT
);
1767 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1770 /* Handle a user-specified function alignment.
1771 Note that we still need to align to DECL_ALIGN, as above,
1772 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1773 if (! DECL_USER_ALIGN (decl
)
1774 && align_functions_log
> align
1775 && optimize_function_for_speed_p (cfun
))
1777 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1778 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1779 align_functions_log
, align_functions
- 1);
1781 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1785 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1786 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1789 if (!DECL_IGNORED_P (decl
))
1790 (*debug_hooks
->begin_function
) (decl
);
1792 /* Make function name accessible from other files, if appropriate. */
1794 if (TREE_PUBLIC (decl
)
1795 || (cgraph_node::get (decl
)->instrumentation_clone
1796 && cgraph_node::get (decl
)->instrumented_version
1797 && TREE_PUBLIC (cgraph_node::get (decl
)->instrumented_version
->decl
)))
1799 notice_global_symbol (decl
);
1801 globalize_decl (decl
);
1803 maybe_assemble_visibility (decl
);
1806 if (DECL_PRESERVE_P (decl
))
1807 targetm
.asm_out
.mark_decl_preserved (fnname
);
1809 /* Do any machine/system dependent processing of the function name. */
1810 #ifdef ASM_DECLARE_FUNCTION_NAME
1811 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1813 /* Standard thing is just output label for the function. */
1814 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1815 #endif /* ASM_DECLARE_FUNCTION_NAME */
1817 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1818 saw_no_split_stack
= true;
1821 /* Output assembler code associated with defining the size of the
1822 function. DECL describes the function. NAME is the function's name. */
1825 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1827 #ifdef ASM_DECLARE_FUNCTION_SIZE
1828 /* We could have switched section in the middle of the function. */
1829 if (flag_reorder_blocks_and_partition
)
1830 switch_to_section (function_section (decl
));
1831 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1833 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1835 output_constant_pool (fnname
, decl
);
1836 switch_to_section (function_section (decl
)); /* need to switch back */
1838 /* Output labels for end of hot/cold text sections (to be used by
1840 if (flag_reorder_blocks_and_partition
)
1842 section
*save_text_section
;
1844 save_text_section
= in_section
;
1845 switch_to_section (unlikely_text_section ());
1846 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1847 if (first_function_block_is_cold
)
1848 switch_to_section (text_section
);
1850 switch_to_section (function_section (decl
));
1851 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1852 switch_to_section (save_text_section
);
1856 /* Assemble code to leave SIZE bytes of zeros. */
1859 assemble_zeros (unsigned HOST_WIDE_INT size
)
1861 /* Do no output if -fsyntax-only. */
1862 if (flag_syntax_only
)
1865 #ifdef ASM_NO_SKIP_IN_TEXT
1866 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1867 so we must output 0s explicitly in the text section. */
1868 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1870 unsigned HOST_WIDE_INT i
;
1871 for (i
= 0; i
< size
; i
++)
1872 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1877 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1880 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1883 assemble_align (int align
)
1885 if (align
> BITS_PER_UNIT
)
1887 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1891 /* Assemble a string constant with the specified C string as contents. */
1894 assemble_string (const char *p
, int size
)
1899 /* If the string is very long, split it up. */
1903 int thissize
= size
- pos
;
1904 if (thissize
> maximum
)
1907 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1915 /* A noswitch_section_callback for lcomm_section. */
1918 emit_local (tree decl ATTRIBUTE_UNUSED
,
1919 const char *name ATTRIBUTE_UNUSED
,
1920 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1921 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1923 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1924 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1925 size
, DECL_ALIGN (decl
));
1927 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1928 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1931 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1936 /* A noswitch_section_callback for bss_noswitch_section. */
1938 #if defined ASM_OUTPUT_ALIGNED_BSS
1940 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1941 const char *name ATTRIBUTE_UNUSED
,
1942 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1943 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1945 #if defined ASM_OUTPUT_ALIGNED_BSS
1946 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
,
1947 get_variable_align (decl
));
1953 /* A noswitch_section_callback for comm_section. */
1956 emit_common (tree decl ATTRIBUTE_UNUSED
,
1957 const char *name ATTRIBUTE_UNUSED
,
1958 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1959 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1961 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1962 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1963 size
, get_variable_align (decl
));
1965 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1966 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
,
1967 get_variable_align (decl
));
1970 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1975 /* A noswitch_section_callback for tls_comm_section. */
1978 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1979 const char *name ATTRIBUTE_UNUSED
,
1980 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1981 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1983 #ifdef ASM_OUTPUT_TLS_COMMON
1984 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
1987 sorry ("thread-local COMMON data not implemented");
1992 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1993 NAME is the name of DECL's SYMBOL_REF. */
1996 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
,
1999 unsigned HOST_WIDE_INT size
, rounded
;
2001 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2004 if ((flag_sanitize
& SANITIZE_ADDRESS
) && asan_protect_global (decl
))
2005 size
+= asan_red_zone_size (size
);
2007 /* Don't allocate zero bytes of common,
2008 since that means "undefined external" in the linker. */
2012 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2013 so that each uninitialized object starts on such a boundary. */
2014 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
2015 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2016 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2018 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
2019 && (unsigned HOST_WIDE_INT
) (align
/ BITS_PER_UNIT
) > rounded
)
2020 error ("requested alignment for %q+D is greater than "
2021 "implemented alignment of %wu", decl
, rounded
);
2024 /* A subroutine of assemble_variable. Output the label and contents of
2025 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
2026 is as for assemble_variable. */
2029 assemble_variable_contents (tree decl
, const char *name
,
2030 bool dont_output_data
)
2032 /* Do any machine/system dependent processing of the object. */
2033 #ifdef ASM_DECLARE_OBJECT_NAME
2034 last_assemble_variable_decl
= decl
;
2035 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
2037 /* Standard thing is just output label for the object. */
2038 ASM_OUTPUT_LABEL (asm_out_file
, name
);
2039 #endif /* ASM_DECLARE_OBJECT_NAME */
2041 if (!dont_output_data
)
2043 /* Caller is supposed to use varpool_get_constructor when it wants
2044 to output the body. */
2045 gcc_assert (!in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
);
2046 if (DECL_INITIAL (decl
)
2047 && DECL_INITIAL (decl
) != error_mark_node
2048 && !initializer_zerop (DECL_INITIAL (decl
)))
2049 /* Output the actual data. */
2050 output_constant (DECL_INITIAL (decl
),
2051 tree_to_uhwi (DECL_SIZE_UNIT (decl
)),
2052 get_variable_align (decl
));
2054 /* Leave space for it. */
2055 assemble_zeros (tree_to_uhwi (DECL_SIZE_UNIT (decl
)));
2056 targetm
.asm_out
.decl_end ();
2060 /* Write out assembly for the variable DECL, which is not defined in
2061 the current translation unit. */
2063 assemble_undefined_decl (tree decl
)
2065 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
2066 targetm
.asm_out
.assemble_undefined_decl (asm_out_file
, name
, decl
);
2069 /* Assemble everything that is needed for a variable or function declaration.
2070 Not used for automatic variables, and not used for function definitions.
2071 Should not be called for variables of incomplete structure type.
2073 TOP_LEVEL is nonzero if this variable has file scope.
2074 AT_END is nonzero if this is the special handling, at end of compilation,
2075 to define things that have had only tentative definitions.
2076 DONT_OUTPUT_DATA if nonzero means don't actually output the
2077 initial value (that will be done by the caller). */
2080 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
2081 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
2084 rtx decl_rtl
, symbol
;
2087 bool asan_protected
= false;
2089 /* This function is supposed to handle VARIABLES. Ensure we have one. */
2090 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
2092 /* Emulated TLS had better not get this far. */
2093 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
2095 last_assemble_variable_decl
= 0;
2097 /* Normally no need to say anything here for external references,
2098 since assemble_external is called by the language-specific code
2099 when a declaration is first seen. */
2101 if (DECL_EXTERNAL (decl
))
2104 /* Do nothing for global register variables. */
2105 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
2107 TREE_ASM_WRITTEN (decl
) = 1;
2111 /* If type was incomplete when the variable was declared,
2112 see if it is complete now. */
2114 if (DECL_SIZE (decl
) == 0)
2115 layout_decl (decl
, 0);
2117 /* Still incomplete => don't allocate it; treat the tentative defn
2118 (which is what it must have been) as an `extern' reference. */
2120 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2122 error ("storage size of %q+D isn%'t known", decl
);
2123 TREE_ASM_WRITTEN (decl
) = 1;
2127 /* The first declaration of a variable that comes through this function
2128 decides whether it is global (in C, has external linkage)
2129 or local (in C, has internal linkage). So do nothing more
2130 if this function has already run. */
2132 if (TREE_ASM_WRITTEN (decl
))
2135 /* Make sure targetm.encode_section_info is invoked before we set
2137 decl_rtl
= DECL_RTL (decl
);
2139 TREE_ASM_WRITTEN (decl
) = 1;
2141 /* Do no output if -fsyntax-only. */
2142 if (flag_syntax_only
)
2145 if (! dont_output_data
2146 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
2148 error ("size of variable %q+D is too large", decl
);
2152 gcc_assert (MEM_P (decl_rtl
));
2153 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2154 symbol
= XEXP (decl_rtl
, 0);
2156 /* If this symbol belongs to the tree constant pool, output the constant
2157 if it hasn't already been written. */
2158 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
2160 tree decl
= SYMBOL_REF_DECL (symbol
);
2161 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
2162 output_constant_def_contents (symbol
);
2168 name
= XSTR (symbol
, 0);
2169 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2170 notice_global_symbol (decl
);
2172 /* Compute the alignment of this data. */
2174 align_variable (decl
, dont_output_data
);
2176 if ((flag_sanitize
& SANITIZE_ADDRESS
)
2177 && asan_protect_global (decl
))
2179 asan_protected
= true;
2180 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
2181 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
2184 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2186 align
= get_variable_align (decl
);
2188 if (TREE_PUBLIC (decl
))
2189 maybe_assemble_visibility (decl
);
2191 if (DECL_PRESERVE_P (decl
))
2192 targetm
.asm_out
.mark_decl_preserved (name
);
2194 /* First make the assembler name(s) global if appropriate. */
2195 sect
= get_variable_section (decl
, false);
2196 if (TREE_PUBLIC (decl
)
2197 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2198 globalize_decl (decl
);
2200 /* Output any data that we will need to use the address of. */
2201 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2202 output_addressed_constants (DECL_INITIAL (decl
));
2204 /* dbxout.c needs to know this. */
2205 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2206 DECL_IN_TEXT_SECTION (decl
) = 1;
2208 /* If the decl is part of an object_block, make sure that the decl
2209 has been positioned within its block, but do not write out its
2210 definition yet. output_object_blocks will do that later. */
2211 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2213 gcc_assert (!dont_output_data
);
2214 place_block_symbol (symbol
);
2216 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2217 assemble_noswitch_variable (decl
, name
, sect
, align
);
2220 /* The following bit of code ensures that vtable_map
2221 variables are not only in the comdat section, but that
2222 each variable has its own unique comdat name. If this
2223 code is removed, the variables end up in the same section
2224 with a single comdat name.
2226 FIXME: resolve_unique_section needs to deal better with
2227 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
2228 that is fixed, this if-else statement can be replaced with
2229 a single call to "switch_to_section (sect)". */
2230 if (sect
->named
.name
2231 && (strcmp (sect
->named
.name
, ".vtable_map_vars") == 0))
2233 #if defined (OBJECT_FORMAT_ELF)
2234 targetm
.asm_out
.named_section (sect
->named
.name
,
2235 sect
->named
.common
.flags
2240 switch_to_section (sect
);
2244 switch_to_section (sect
);
2245 if (align
> BITS_PER_UNIT
)
2246 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
2247 assemble_variable_contents (decl
, name
, dont_output_data
);
2250 unsigned HOST_WIDE_INT
int size
2251 = tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2252 assemble_zeros (asan_red_zone_size (size
));
2258 /* Given a function declaration (FN_DECL), this function assembles the
2259 function into the .preinit_array section. */
2262 assemble_vtv_preinit_initializer (tree fn_decl
)
2265 unsigned flags
= SECTION_WRITE
;
2266 rtx symbol
= XEXP (DECL_RTL (fn_decl
), 0);
2268 flags
|= SECTION_NOTYPE
;
2269 sect
= get_section (".preinit_array", flags
, fn_decl
);
2270 switch_to_section (sect
);
2271 assemble_addr_to_section (symbol
, sect
);
2274 /* Return 1 if type TYPE contains any pointers. */
2277 contains_pointers_p (tree type
)
2279 switch (TREE_CODE (type
))
2282 case REFERENCE_TYPE
:
2283 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2284 so I'll play safe and return 1. */
2290 case QUAL_UNION_TYPE
:
2293 /* For a type that has fields, see if the fields have pointers. */
2294 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2295 if (TREE_CODE (fields
) == FIELD_DECL
2296 && contains_pointers_p (TREE_TYPE (fields
)))
2302 /* An array type contains pointers if its element type does. */
2303 return contains_pointers_p (TREE_TYPE (type
));
2310 /* We delay assemble_external processing until
2311 the compilation unit is finalized. This is the best we can do for
2312 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2313 it all the way to final. See PR 17982 for further discussion. */
2314 static GTY(()) tree pending_assemble_externals
;
2316 #ifdef ASM_OUTPUT_EXTERNAL
2317 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2318 As a result, assemble_external can be called after the list of externals
2319 is processed and the pointer set destroyed. */
2320 static bool pending_assemble_externals_processed
;
2322 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2323 TREE_LIST in assemble_external. */
2324 static hash_set
<tree
> *pending_assemble_externals_set
;
2326 /* True if DECL is a function decl for which no out-of-line copy exists.
2327 It is assumed that DECL's assembler name has been set. */
2330 incorporeal_function_p (tree decl
)
2332 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2336 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2337 && (DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
2338 || DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA_WITH_ALIGN
))
2341 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2342 /* Atomic or sync builtins which have survived this far will be
2343 resolved externally and therefore are not incorporeal. */
2344 if (strncmp (name
, "__builtin_", 10) == 0)
2350 /* Actually do the tests to determine if this is necessary, and invoke
2351 ASM_OUTPUT_EXTERNAL. */
2353 assemble_external_real (tree decl
)
2355 rtx rtl
= DECL_RTL (decl
);
2357 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2358 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2359 && !incorporeal_function_p (decl
))
2361 /* Some systems do require some output. */
2362 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2363 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2369 process_pending_assemble_externals (void)
2371 #ifdef ASM_OUTPUT_EXTERNAL
2373 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2374 assemble_external_real (TREE_VALUE (list
));
2376 pending_assemble_externals
= 0;
2377 pending_assemble_externals_processed
= true;
2378 delete pending_assemble_externals_set
;
2382 /* This TREE_LIST contains any weak symbol declarations waiting
2384 static GTY(()) tree weak_decls
;
2386 /* Output something to declare an external symbol to the assembler,
2387 and qualifiers such as weakness. (Most assemblers don't need
2388 extern declaration, so we normally output nothing.) Do nothing if
2389 DECL is not external. */
2392 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2394 /* Make sure that the ASM_OUT_FILE is open.
2395 If it's not, we should not be calling this function. */
2396 gcc_assert (asm_out_file
);
2398 /* In a perfect world, the following condition would be true.
2399 Sadly, the Java and Go front ends emit assembly *from the front end*,
2400 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2402 /* This function should only be called if we are expanding, or have
2404 Ideally, only final.c would be calling this function, but it is
2405 not clear whether that would break things somehow. See PR 17982
2406 for further discussion. */
2407 gcc_assert (state
== EXPANSION
2408 || state
== FINISHED
);
2411 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2414 /* We want to output annotation for weak and external symbols at
2415 very last to check if they are references or not. */
2417 if (TARGET_SUPPORTS_WEAK
2419 /* TREE_STATIC is a weird and abused creature which is not
2420 generally the right test for whether an entity has been
2421 locally emitted, inlined or otherwise not-really-extern, but
2422 for declarations that can be weak, it happens to be
2424 && !TREE_STATIC (decl
)
2425 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2426 && value_member (decl
, weak_decls
) == NULL_TREE
)
2427 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2429 #ifdef ASM_OUTPUT_EXTERNAL
2430 if (pending_assemble_externals_processed
)
2432 assemble_external_real (decl
);
2436 if (! pending_assemble_externals_set
->add (decl
))
2437 pending_assemble_externals
= tree_cons (NULL
, decl
,
2438 pending_assemble_externals
);
2442 /* Similar, for calling a library function FUN. */
2445 assemble_external_libcall (rtx fun
)
2447 /* Declare library function name external when first used, if nec. */
2448 if (! SYMBOL_REF_USED (fun
))
2450 SYMBOL_REF_USED (fun
) = 1;
2451 targetm
.asm_out
.external_libcall (fun
);
2455 /* Assemble a label named NAME. */
2458 assemble_label (FILE *file
, const char *name
)
2460 ASM_OUTPUT_LABEL (file
, name
);
2463 /* Set the symbol_referenced flag for ID. */
2465 mark_referenced (tree id
)
2467 TREE_SYMBOL_REFERENCED (id
) = 1;
2470 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2472 mark_decl_referenced (tree decl
)
2474 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2476 /* Extern inline functions don't become needed when referenced.
2477 If we know a method will be emitted in other TU and no new
2478 functions can be marked reachable, just use the external
2480 struct cgraph_node
*node
= cgraph_node::get_create (decl
);
2481 if (!DECL_EXTERNAL (decl
)
2482 && !node
->definition
)
2483 node
->mark_force_output ();
2485 else if (TREE_CODE (decl
) == VAR_DECL
)
2487 varpool_node
*node
= varpool_node::get_create (decl
);
2488 /* C++ frontend use mark_decl_references to force COMDAT variables
2489 to be output that might appear dead otherwise. */
2490 node
->force_output
= true;
2492 /* else do nothing - we can get various sorts of CST nodes here,
2493 which do not need to be marked. */
2497 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2498 starts with a *, the rest of NAME is output verbatim. Otherwise
2499 NAME is transformed in a target-specific way (usually by the
2500 addition of an underscore). */
2503 assemble_name_raw (FILE *file
, const char *name
)
2506 fputs (&name
[1], file
);
2508 ASM_OUTPUT_LABELREF (file
, name
);
2511 /* Like assemble_name_raw, but should be used when NAME might refer to
2512 an entity that is also represented as a tree (like a function or
2513 variable). If NAME does refer to such an entity, that entity will
2514 be marked as referenced. */
2517 assemble_name (FILE *file
, const char *name
)
2519 const char *real_name
;
2522 real_name
= targetm
.strip_name_encoding (name
);
2524 id
= maybe_get_identifier (real_name
);
2529 mark_referenced (id
);
2530 ultimate_transparent_alias_target (&id
);
2532 name
= IDENTIFIER_POINTER (id
);
2533 gcc_assert (! TREE_CHAIN (id
));
2536 assemble_name_raw (file
, name
);
2539 /* Allocate SIZE bytes writable static space with a gensym name
2540 and return an RTX to refer to its address. */
2543 assemble_static_space (unsigned HOST_WIDE_INT size
)
2546 const char *namestring
;
2549 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2551 namestring
= ggc_strdup (name
);
2553 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2554 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2556 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2557 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2560 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2561 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2564 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2565 so that each uninitialized object starts on such a boundary. */
2566 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2567 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2568 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2569 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2570 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2571 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2578 /* Assemble the static constant template for function entry trampolines.
2579 This is done at most once per compilation.
2580 Returns an RTX for the address of the template. */
2582 static GTY(()) rtx initial_trampoline
;
2585 assemble_trampoline_template (void)
2592 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2594 if (initial_trampoline
)
2595 return initial_trampoline
;
2597 /* By default, put trampoline templates in read-only data section. */
2599 #ifdef TRAMPOLINE_SECTION
2600 switch_to_section (TRAMPOLINE_SECTION
);
2602 switch_to_section (readonly_data_section
);
2605 /* Write the assembler code to define one. */
2606 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2608 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2610 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2611 targetm
.asm_out
.trampoline_template (asm_out_file
);
2613 /* Record the rtl to refer to it. */
2614 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2615 name
= ggc_strdup (label
);
2616 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2617 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2619 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2620 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2621 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2623 return initial_trampoline
;
2626 /* A and B are either alignments or offsets. Return the minimum alignment
2627 that may be assumed after adding the two together. */
2629 static inline unsigned
2630 min_align (unsigned int a
, unsigned int b
)
2632 return (a
| b
) & -(a
| b
);
2635 /* Return the assembler directive for creating a given kind of integer
2636 object. SIZE is the number of bytes in the object and ALIGNED_P
2637 indicates whether it is known to be aligned. Return NULL if the
2638 assembly dialect has no such directive.
2640 The returned string should be printed at the start of a new line and
2641 be followed immediately by the object's initial value. */
2644 integer_asm_op (int size
, int aligned_p
)
2646 struct asm_int_op
*ops
;
2649 ops
= &targetm
.asm_out
.aligned_op
;
2651 ops
= &targetm
.asm_out
.unaligned_op
;
2656 return targetm
.asm_out
.byte_op
;
2670 /* Use directive OP to assemble an integer object X. Print OP at the
2671 start of the line, followed immediately by the value of X. */
2674 assemble_integer_with_op (const char *op
, rtx x
)
2676 fputs (op
, asm_out_file
);
2677 output_addr_const (asm_out_file
, x
);
2678 fputc ('\n', asm_out_file
);
2681 /* The default implementation of the asm_out.integer target hook. */
2684 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2685 unsigned int size ATTRIBUTE_UNUSED
,
2686 int aligned_p ATTRIBUTE_UNUSED
)
2688 const char *op
= integer_asm_op (size
, aligned_p
);
2689 /* Avoid GAS bugs for large values. Specifically negative values whose
2690 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2691 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE_UNITS
)
2693 return op
&& (assemble_integer_with_op (op
, x
), true);
2696 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2697 the alignment of the integer in bits. Return 1 if we were able to output
2698 the constant, otherwise 0. We must be able to output the constant,
2699 if FORCE is nonzero. */
2702 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2706 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2708 /* See if the target hook can handle this kind of object. */
2709 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2712 /* If the object is a multi-byte one, try splitting it up. Split
2713 it into words it if is multi-word, otherwise split it into bytes. */
2716 machine_mode omode
, imode
;
2717 unsigned int subalign
;
2718 unsigned int subsize
, i
;
2719 enum mode_class mclass
;
2721 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2722 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2723 if (GET_CODE (x
) == CONST_FIXED
)
2724 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2728 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2729 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2731 for (i
= 0; i
< size
; i
+= subsize
)
2733 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2734 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2740 /* If we've printed some of it, but not all of it, there's no going
2745 gcc_assert (!force
);
2751 assemble_real (REAL_VALUE_TYPE d
, machine_mode mode
, unsigned int align
)
2753 long data
[4] = {0, 0, 0, 0};
2755 int bitsize
, nelts
, nunits
, units_per
;
2757 /* This is hairy. We have a quantity of known size. real_to_target
2758 will put it into an array of *host* longs, 32 bits per element
2759 (even if long is more than 32 bits). We need to determine the
2760 number of array elements that are occupied (nelts) and the number
2761 of *target* min-addressable units that will be occupied in the
2762 object file (nunits). We cannot assume that 32 divides the
2763 mode's bitsize (size * BITS_PER_UNIT) evenly.
2765 size * BITS_PER_UNIT is used here to make sure that padding bits
2766 (which might appear at either end of the value; real_to_target
2767 will include the padding bits in its output array) are included. */
2769 nunits
= GET_MODE_SIZE (mode
);
2770 bitsize
= nunits
* BITS_PER_UNIT
;
2771 nelts
= CEIL (bitsize
, 32);
2772 units_per
= 32 / BITS_PER_UNIT
;
2774 real_to_target (data
, &d
, mode
);
2776 /* Put out the first word with the specified alignment. */
2777 assemble_integer (GEN_INT (data
[0]), 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 (i
= 1; i
< nelts
; i
++)
2785 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2786 nunits
-= units_per
;
2790 /* Given an expression EXP with a constant value,
2791 reduce it to the sum of an assembler symbol and an integer.
2792 Store them both in the structure *VALUE.
2793 EXP must be reducible. */
2797 HOST_WIDE_INT offset
;
2801 decode_addr_const (tree exp
, struct addr_const
*value
)
2803 tree target
= TREE_OPERAND (exp
, 0);
2809 if (TREE_CODE (target
) == COMPONENT_REF
2810 && tree_fits_shwi_p (byte_position (TREE_OPERAND (target
, 1))))
2812 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2813 target
= TREE_OPERAND (target
, 0);
2815 else if (TREE_CODE (target
) == ARRAY_REF
2816 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2818 offset
+= (tree_to_uhwi (TYPE_SIZE_UNIT (TREE_TYPE (target
)))
2819 * tree_to_shwi (TREE_OPERAND (target
, 1)));
2820 target
= TREE_OPERAND (target
, 0);
2822 else if (TREE_CODE (target
) == MEM_REF
2823 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2825 offset
+= mem_ref_offset (target
).to_short_addr ();
2826 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2828 else if (TREE_CODE (target
) == INDIRECT_REF
2829 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2830 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2832 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2837 switch (TREE_CODE (target
))
2841 x
= DECL_RTL (target
);
2845 x
= gen_rtx_MEM (FUNCTION_MODE
,
2846 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2855 x
= output_constant_def (target
, 1);
2862 gcc_assert (MEM_P (x
));
2866 value
->offset
= offset
;
2869 static GTY(()) hash_table
<tree_descriptor_hasher
> *const_desc_htab
;
2871 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2873 /* Constant pool accessor function. */
2875 hash_table
<tree_descriptor_hasher
> *
2876 constant_pool_htab (void)
2878 return const_desc_htab
;
2881 /* Compute a hash code for a constant expression. */
2884 tree_descriptor_hasher::hash (constant_descriptor_tree
*ptr
)
2890 const_hash_1 (const tree exp
)
2895 enum tree_code code
= TREE_CODE (exp
);
2897 /* Either set P and LEN to the address and len of something to hash and
2898 exit the switch or return a value. */
2903 p
= (char *) &TREE_INT_CST_ELT (exp
, 0);
2904 len
= TREE_INT_CST_NUNITS (exp
) * sizeof (HOST_WIDE_INT
);
2908 return real_hash (TREE_REAL_CST_PTR (exp
));
2911 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2914 p
= TREE_STRING_POINTER (exp
);
2915 len
= TREE_STRING_LENGTH (exp
);
2919 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2920 + const_hash_1 (TREE_IMAGPART (exp
)));
2926 hi
= 7 + VECTOR_CST_NELTS (exp
);
2928 for (i
= 0; i
< VECTOR_CST_NELTS (exp
); ++i
)
2929 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ELT (exp
, i
));
2936 unsigned HOST_WIDE_INT idx
;
2939 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2941 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2943 hi
= hi
* 603 + const_hash_1 (value
);
2951 struct addr_const value
;
2953 decode_addr_const (exp
, &value
);
2954 switch (GET_CODE (value
.base
))
2957 /* Don't hash the address of the SYMBOL_REF;
2958 only use the offset and the symbol name. */
2960 p
= XSTR (value
.base
, 0);
2961 for (i
= 0; p
[i
] != 0; i
++)
2962 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2967 + CODE_LABEL_NUMBER (LABEL_REF_LABEL (value
.base
)) * 13);
2977 case POINTER_PLUS_EXPR
:
2979 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2980 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2983 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2986 /* A language specific constant. Just hash the code. */
2990 /* Compute hashing function. */
2992 for (i
= 0; i
< len
; i
++)
2993 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2998 /* Wrapper of compare_constant, for the htab interface. */
3000 tree_descriptor_hasher::equal (constant_descriptor_tree
*c1
,
3001 constant_descriptor_tree
*c2
)
3003 if (c1
->hash
!= c2
->hash
)
3005 return compare_constant (c1
->value
, c2
->value
);
3008 /* Compare t1 and t2, and return 1 only if they are known to result in
3009 the same bit pattern on output. */
3012 compare_constant (const tree t1
, const tree t2
)
3014 enum tree_code typecode
;
3016 if (t1
== NULL_TREE
)
3017 return t2
== NULL_TREE
;
3018 if (t2
== NULL_TREE
)
3021 if (TREE_CODE (t1
) != TREE_CODE (t2
))
3024 switch (TREE_CODE (t1
))
3027 /* Integer constants are the same only if the same width of type. */
3028 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3030 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3032 return tree_int_cst_equal (t1
, t2
);
3035 /* Real constants are the same only if the same width of type. */
3036 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3039 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
3042 /* Fixed constants are the same only if the same width of type. */
3043 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3046 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
3049 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3052 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
3053 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
3054 TREE_STRING_LENGTH (t1
)));
3057 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
3058 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
3064 if (VECTOR_CST_NELTS (t1
) != VECTOR_CST_NELTS (t2
))
3067 for (i
= 0; i
< VECTOR_CST_NELTS (t1
); ++i
)
3068 if (!compare_constant (VECTOR_CST_ELT (t1
, i
),
3069 VECTOR_CST_ELT (t2
, i
)))
3077 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
3078 unsigned HOST_WIDE_INT idx
;
3080 typecode
= TREE_CODE (TREE_TYPE (t1
));
3081 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
3084 if (typecode
== ARRAY_TYPE
)
3086 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
3087 /* For arrays, check that the sizes all match. */
3088 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
3090 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
3095 /* For record and union constructors, require exact type
3097 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
3101 v1
= CONSTRUCTOR_ELTS (t1
);
3102 v2
= CONSTRUCTOR_ELTS (t2
);
3103 if (vec_safe_length (v1
) != vec_safe_length (v2
))
3106 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
3108 constructor_elt
*c1
= &(*v1
)[idx
];
3109 constructor_elt
*c2
= &(*v2
)[idx
];
3111 /* Check that each value is the same... */
3112 if (!compare_constant (c1
->value
, c2
->value
))
3114 /* ... and that they apply to the same fields! */
3115 if (typecode
== ARRAY_TYPE
)
3117 if (!compare_constant (c1
->index
, c2
->index
))
3122 if (c1
->index
!= c2
->index
)
3133 struct addr_const value1
, value2
;
3137 decode_addr_const (t1
, &value1
);
3138 decode_addr_const (t2
, &value2
);
3140 if (value1
.offset
!= value2
.offset
)
3143 code
= GET_CODE (value1
.base
);
3144 if (code
!= GET_CODE (value2
.base
))
3150 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3154 ret
= (CODE_LABEL_NUMBER (LABEL_REF_LABEL (value1
.base
))
3155 == CODE_LABEL_NUMBER (LABEL_REF_LABEL (value2
.base
)));
3165 case POINTER_PLUS_EXPR
:
3168 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3169 && compare_constant (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3172 case VIEW_CONVERT_EXPR
:
3173 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3182 /* Return the section into which constant EXP should be placed. */
3185 get_constant_section (tree exp
, unsigned int align
)
3187 return targetm
.asm_out
.select_section (exp
,
3188 compute_reloc_for_constant (exp
),
3192 /* Return the size of constant EXP in bytes. */
3194 static HOST_WIDE_INT
3195 get_constant_size (tree exp
)
3199 size
= int_size_in_bytes (TREE_TYPE (exp
));
3200 if (TREE_CODE (exp
) == STRING_CST
)
3201 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3205 /* Subroutine of output_constant_def:
3206 No constant equal to EXP is known to have been output.
3207 Make a constant descriptor to enter EXP in the hash table.
3208 Assign the label number and construct RTL to refer to the
3209 constant's location in memory.
3210 Caller is responsible for updating the hash table. */
3212 static struct constant_descriptor_tree
*
3213 build_constant_desc (tree exp
)
3215 struct constant_descriptor_tree
*desc
;
3221 desc
= ggc_alloc
<constant_descriptor_tree
> ();
3224 /* Create a string containing the label name, in LABEL. */
3225 labelno
= const_labelno
++;
3226 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3228 /* Construct the VAR_DECL associated with the constant. */
3229 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3231 DECL_ARTIFICIAL (decl
) = 1;
3232 DECL_IGNORED_P (decl
) = 1;
3233 TREE_READONLY (decl
) = 1;
3234 TREE_STATIC (decl
) = 1;
3235 TREE_ADDRESSABLE (decl
) = 1;
3236 /* We don't set the RTL yet as this would cause varpool to assume that the
3237 variable is referenced. Moreover, it would just be dropped in LTO mode.
3238 Instead we set the flag that will be recognized in make_decl_rtl. */
3239 DECL_IN_CONSTANT_POOL (decl
) = 1;
3240 DECL_INITIAL (decl
) = desc
->value
;
3241 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3242 architectures so use DATA_ALIGNMENT as well, except for strings. */
3243 if (TREE_CODE (exp
) == STRING_CST
)
3245 #ifdef CONSTANT_ALIGNMENT
3246 DECL_ALIGN (decl
) = CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
));
3250 align_variable (decl
, 0);
3252 /* Now construct the SYMBOL_REF and the MEM. */
3253 if (use_object_blocks_p ())
3255 section
*sect
= get_constant_section (exp
, DECL_ALIGN (decl
));
3256 symbol
= create_block_symbol (ggc_strdup (label
),
3257 get_block_for_section (sect
), -1);
3260 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3261 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3262 SET_SYMBOL_REF_DECL (symbol
, decl
);
3263 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3265 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3266 set_mem_attributes (rtl
, exp
, 1);
3267 set_mem_alias_set (rtl
, 0);
3269 /* We cannot share RTX'es in pool entries.
3270 Mark this piece of RTL as required for unsharing. */
3271 RTX_FLAG (rtl
, used
) = 1;
3273 /* Set flags or add text to the name to record information, such as
3274 that it is a local symbol. If the name is changed, the macro
3275 ASM_OUTPUT_LABELREF will have to know how to strip this
3276 information. This call might invalidate our local variable
3277 SYMBOL; we can't use it afterward. */
3278 targetm
.encode_section_info (exp
, rtl
, true);
3285 /* Return an rtx representing a reference to constant data in memory
3286 for the constant expression EXP.
3288 If assembler code for such a constant has already been output,
3289 return an rtx to refer to it.
3290 Otherwise, output such a constant in memory
3291 and generate an rtx for it.
3293 If DEFER is nonzero, this constant can be deferred and output only
3294 if referenced in the function after all optimizations.
3296 `const_desc_table' records which constants already have label strings. */
3299 output_constant_def (tree exp
, int defer
)
3301 struct constant_descriptor_tree
*desc
;
3302 struct constant_descriptor_tree key
;
3304 /* Look up EXP in the table of constant descriptors. If we didn't find
3305 it, create a new one. */
3307 key
.hash
= const_hash_1 (exp
);
3308 constant_descriptor_tree
**loc
3309 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3314 desc
= build_constant_desc (exp
);
3315 desc
->hash
= key
.hash
;
3319 maybe_output_constant_def_contents (desc
, defer
);
3323 /* Subroutine of output_constant_def: Decide whether or not we need to
3324 output the constant DESC now, and if so, do it. */
3326 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3329 rtx symbol
= XEXP (desc
->rtl
, 0);
3330 tree exp
= desc
->value
;
3332 if (flag_syntax_only
)
3335 if (TREE_ASM_WRITTEN (exp
))
3336 /* Already output; don't do it again. */
3339 /* We can always defer constants as long as the context allows
3343 /* Increment n_deferred_constants if it exists. It needs to be at
3344 least as large as the number of constants actually referred to
3345 by the function. If it's too small we'll stop looking too early
3346 and fail to emit constants; if it's too large we'll only look
3347 through the entire function when we could have stopped earlier. */
3349 n_deferred_constants
++;
3353 output_constant_def_contents (symbol
);
3356 /* Subroutine of output_constant_def_contents. Output the definition
3357 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3358 constant's alignment in bits. */
3361 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3365 size
= get_constant_size (exp
);
3367 /* Do any machine/system dependent processing of the constant. */
3368 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3370 /* Output the value of EXP. */
3371 output_constant (exp
, size
, align
);
3373 targetm
.asm_out
.decl_end ();
3376 /* We must output the constant data referred to by SYMBOL; do so. */
3379 output_constant_def_contents (rtx symbol
)
3381 tree decl
= SYMBOL_REF_DECL (symbol
);
3382 tree exp
= DECL_INITIAL (decl
);
3384 bool asan_protected
= false;
3386 /* Make sure any other constants whose addresses appear in EXP
3387 are assigned label numbers. */
3388 output_addressed_constants (exp
);
3390 /* We are no longer deferring this constant. */
3391 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3393 if ((flag_sanitize
& SANITIZE_ADDRESS
)
3394 && TREE_CODE (exp
) == STRING_CST
3395 && asan_protect_global (exp
))
3397 asan_protected
= true;
3398 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
3399 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
3402 /* If the constant is part of an object block, make sure that the
3403 decl has been positioned within its block, but do not write out
3404 its definition yet. output_object_blocks will do that later. */
3405 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3406 place_block_symbol (symbol
);
3409 align
= DECL_ALIGN (decl
);
3410 switch_to_section (get_constant_section (exp
, align
));
3411 if (align
> BITS_PER_UNIT
)
3412 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3413 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3416 HOST_WIDE_INT size
= get_constant_size (exp
);
3417 assemble_zeros (asan_red_zone_size (size
));
3422 /* Look up EXP in the table of constant descriptors. Return the rtl
3423 if it has been emitted, else null. */
3426 lookup_constant_def (tree exp
)
3428 struct constant_descriptor_tree key
;
3431 key
.hash
= const_hash_1 (exp
);
3432 constant_descriptor_tree
*desc
3433 = const_desc_htab
->find_with_hash (&key
, key
.hash
);
3435 return (desc
? desc
->rtl
: NULL_RTX
);
3438 /* Return a tree representing a reference to constant data in memory
3439 for the constant expression EXP.
3441 This is the counterpart of output_constant_def at the Tree level. */
3444 tree_output_constant_def (tree exp
)
3446 struct constant_descriptor_tree
*desc
, key
;
3449 /* Look up EXP in the table of constant descriptors. If we didn't find
3450 it, create a new one. */
3452 key
.hash
= const_hash_1 (exp
);
3453 constant_descriptor_tree
**loc
3454 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3459 desc
= build_constant_desc (exp
);
3460 desc
->hash
= key
.hash
;
3464 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3465 varpool_node::finalize_decl (decl
);
3469 struct GTY((chain_next ("%h.next"), for_user
)) constant_descriptor_rtx
{
3470 struct constant_descriptor_rtx
*next
;
3474 HOST_WIDE_INT offset
;
3482 struct const_rtx_desc_hasher
: ggc_hasher
<constant_descriptor_rtx
*>
3484 static hashval_t
hash (constant_descriptor_rtx
*);
3485 static bool equal (constant_descriptor_rtx
*, constant_descriptor_rtx
*);
3488 /* Used in the hash tables to avoid outputting the same constant
3489 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3490 are output once per function, not once per file. */
3491 /* ??? Only a few targets need per-function constant pools. Most
3492 can use one per-file pool. Should add a targetm bit to tell the
3495 struct GTY(()) rtx_constant_pool
{
3496 /* Pointers to first and last constant in pool, as ordered by offset. */
3497 struct constant_descriptor_rtx
*first
;
3498 struct constant_descriptor_rtx
*last
;
3500 /* Hash facility for making memory-constants from constant rtl-expressions.
3501 It is used on RISC machines where immediate integer arguments and
3502 constant addresses are restricted so that such constants must be stored
3504 hash_table
<const_rtx_desc_hasher
> *const_rtx_htab
;
3506 /* Current offset in constant pool (does not include any
3507 machine-specific header). */
3508 HOST_WIDE_INT offset
;
3511 /* Hash and compare functions for const_rtx_htab. */
3514 const_rtx_desc_hasher::hash (constant_descriptor_rtx
*desc
)
3520 const_rtx_desc_hasher::equal (constant_descriptor_rtx
*x
,
3521 constant_descriptor_rtx
*y
)
3523 if (x
->mode
!= y
->mode
)
3525 return rtx_equal_p (x
->constant
, y
->constant
);
3528 /* Hash one component of a constant. */
3531 const_rtx_hash_1 (const_rtx x
)
3533 unsigned HOST_WIDE_INT hwi
;
3539 code
= GET_CODE (x
);
3540 mode
= GET_MODE (x
);
3541 h
= (hashval_t
) code
* 1048573 + mode
;
3550 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3551 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3553 h
^= (hashval_t
) hwi
;
3554 for (i
= 1; i
< n
; ++i
)
3557 h
^= (hashval_t
) hwi
;
3562 case CONST_WIDE_INT
:
3563 hwi
= GET_MODE_PRECISION (mode
);
3565 for (i
= 0; i
< CONST_WIDE_INT_NUNITS (x
); i
++)
3566 hwi
^= CONST_WIDE_INT_ELT (x
, i
);
3571 if (TARGET_SUPPORTS_WIDE_INT
== 0 && mode
== VOIDmode
)
3573 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3577 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3581 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3585 h
^= htab_hash_string (XSTR (x
, 0));
3589 h
= h
* 251 + CODE_LABEL_NUMBER (LABEL_REF_LABEL (x
));
3593 case UNSPEC_VOLATILE
:
3594 h
= h
* 251 + XINT (x
, 1);
3604 /* Compute a hash value for X, which should be a constant. */
3607 const_rtx_hash (rtx x
)
3610 subrtx_iterator::array_type array
;
3611 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
3612 h
= h
* 509 + const_rtx_hash_1 (*iter
);
3617 /* Create and return a new rtx constant pool. */
3619 static struct rtx_constant_pool
*
3620 create_constant_pool (void)
3622 struct rtx_constant_pool
*pool
;
3624 pool
= ggc_alloc
<rtx_constant_pool
> ();
3625 pool
->const_rtx_htab
= hash_table
<const_rtx_desc_hasher
>::create_ggc (31);
3632 /* Initialize constant pool hashing for a new function. */
3635 init_varasm_status (void)
3637 crtl
->varasm
.pool
= create_constant_pool ();
3638 crtl
->varasm
.deferred_constants
= 0;
3641 /* Given a MINUS expression, simplify it if both sides
3642 include the same symbol. */
3645 simplify_subtraction (rtx x
)
3647 rtx r
= simplify_rtx (x
);
3651 /* Given a constant rtx X, make (or find) a memory constant for its value
3652 and return a MEM rtx to refer to it in memory. */
3655 force_const_mem (machine_mode mode
, rtx x
)
3657 struct constant_descriptor_rtx
*desc
, tmp
;
3658 struct rtx_constant_pool
*pool
;
3663 constant_descriptor_rtx
**slot
;
3665 /* If we're not allowed to drop X into the constant pool, don't. */
3666 if (targetm
.cannot_force_const_mem (mode
, x
))
3669 /* Record that this function has used a constant pool entry. */
3670 crtl
->uses_const_pool
= 1;
3672 /* Decide which pool to use. */
3673 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3674 ? shared_constant_pool
3675 : crtl
->varasm
.pool
);
3677 /* Lookup the value in the hashtable. */
3680 hash
= const_rtx_hash (x
);
3681 slot
= pool
->const_rtx_htab
->find_slot_with_hash (&tmp
, hash
, INSERT
);
3684 /* If the constant was already present, return its memory. */
3686 return copy_rtx (desc
->mem
);
3688 /* Otherwise, create a new descriptor. */
3689 desc
= ggc_alloc
<constant_descriptor_rtx
> ();
3692 /* Align the location counter as required by EXP's data type. */
3693 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3694 #ifdef CONSTANT_ALIGNMENT
3696 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3697 if (type
!= NULL_TREE
)
3698 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3702 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3703 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3706 desc
->constant
= copy_rtx (tmp
.constant
);
3707 desc
->offset
= pool
->offset
;
3710 desc
->align
= align
;
3711 desc
->labelno
= const_labelno
;
3714 pool
->offset
+= GET_MODE_SIZE (mode
);
3716 pool
->last
->next
= desc
;
3718 pool
->first
= pool
->last
= desc
;
3721 /* Create a string containing the label name, in LABEL. */
3722 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3725 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3726 the constants pool. */
3727 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3729 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3730 symbol
= create_block_symbol (ggc_strdup (label
),
3731 get_block_for_section (sect
), -1);
3734 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3736 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3737 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3738 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3740 /* Construct the MEM. */
3741 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3742 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3743 set_mem_align (def
, align
);
3745 /* If we're dropping a label to the constant pool, make sure we
3747 if (GET_CODE (x
) == LABEL_REF
)
3748 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3750 return copy_rtx (def
);
3753 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3756 get_pool_constant (const_rtx addr
)
3758 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3761 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3762 and whether it has been output or not. */
3765 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3767 struct constant_descriptor_rtx
*desc
;
3769 desc
= SYMBOL_REF_CONSTANT (addr
);
3770 *pmarked
= (desc
->mark
!= 0);
3771 return desc
->constant
;
3774 /* Similar, return the mode. */
3777 get_pool_mode (const_rtx addr
)
3779 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3782 /* Return the size of the constant pool. */
3785 get_pool_size (void)
3787 return crtl
->varasm
.pool
->offset
;
3790 /* Worker function for output_constant_pool_1. Emit assembly for X
3791 in MODE with known alignment ALIGN. */
3794 output_constant_pool_2 (machine_mode mode
, rtx x
, unsigned int align
)
3796 switch (GET_MODE_CLASS (mode
))
3799 case MODE_DECIMAL_FLOAT
:
3803 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3804 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3805 assemble_real (r
, mode
, align
);
3810 case MODE_PARTIAL_INT
:
3815 case MODE_POINTER_BOUNDS
:
3816 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3819 case MODE_VECTOR_FLOAT
:
3820 case MODE_VECTOR_INT
:
3821 case MODE_VECTOR_FRACT
:
3822 case MODE_VECTOR_UFRACT
:
3823 case MODE_VECTOR_ACCUM
:
3824 case MODE_VECTOR_UACCUM
:
3827 machine_mode submode
= GET_MODE_INNER (mode
);
3828 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3830 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3831 units
= CONST_VECTOR_NUNITS (x
);
3833 for (i
= 0; i
< units
; i
++)
3835 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3836 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3846 /* Worker function for output_constant_pool. Emit constant DESC,
3847 giving it ALIGN bits of alignment. */
3850 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3857 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3858 whose CODE_LABEL has been deleted. This can occur if a jump table
3859 is eliminated by optimization. If so, write a constant of zero
3860 instead. Note that this can also happen by turning the
3861 CODE_LABEL into a NOTE. */
3862 /* ??? This seems completely and utterly wrong. Certainly it's
3863 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3864 functioning even with rtx_insn::deleted and friends. */
3867 switch (GET_CODE (tmp
))
3870 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3871 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3873 tmp
= XEXP (XEXP (tmp
, 0), 0);
3877 tmp
= LABEL_REF_LABEL (tmp
);
3878 gcc_assert (!as_a
<rtx_insn
*> (tmp
)->deleted ());
3879 gcc_assert (!NOTE_P (tmp
)
3880 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3887 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3888 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3889 align
, desc
->labelno
, done
);
3892 assemble_align (align
);
3894 /* Output the label. */
3895 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3897 /* Output the data. */
3898 output_constant_pool_2 (desc
->mode
, x
, align
);
3900 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3901 sections have proper size. */
3902 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3904 && (in_section
->common
.flags
& SECTION_MERGE
))
3905 assemble_align (align
);
3907 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3913 /* Mark all constants that are referenced by SYMBOL_REFs in X.
3914 Emit referenced deferred strings. */
3917 mark_constants_in_pattern (rtx insn
)
3919 subrtx_iterator::array_type array
;
3920 FOR_EACH_SUBRTX (iter
, array
, PATTERN (insn
), ALL
)
3922 const_rtx x
= *iter
;
3923 if (GET_CODE (x
) == SYMBOL_REF
)
3925 if (CONSTANT_POOL_ADDRESS_P (x
))
3927 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3928 if (desc
->mark
== 0)
3931 iter
.substitute (desc
->constant
);
3934 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3936 tree decl
= SYMBOL_REF_DECL (x
);
3937 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
3939 n_deferred_constants
--;
3940 output_constant_def_contents (CONST_CAST_RTX (x
));
3947 /* Look through appropriate parts of INSN, marking all entries in the
3948 constant pool which are actually being used. Entries that are only
3949 referenced by other constants are also marked as used. Emit
3950 deferred strings that are used. */
3953 mark_constants (rtx_insn
*insn
)
3958 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3959 insns, not any notes that may be attached. We don't want to mark
3960 a constant just because it happens to appear in a REG_EQUIV note. */
3961 if (rtx_sequence
*seq
= dyn_cast
<rtx_sequence
*> (PATTERN (insn
)))
3963 int i
, n
= seq
->len ();
3964 for (i
= 0; i
< n
; ++i
)
3966 rtx subinsn
= seq
->element (i
);
3967 if (INSN_P (subinsn
))
3968 mark_constants_in_pattern (subinsn
);
3972 mark_constants_in_pattern (insn
);
3975 /* Look through the instructions for this function, and mark all the
3976 entries in POOL which are actually being used. Emit deferred constants
3977 which have indeed been used. */
3980 mark_constant_pool (void)
3984 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
3987 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3988 mark_constants (insn
);
3991 /* Write all the constants in POOL. */
3994 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
3996 struct constant_descriptor_rtx
*desc
;
3998 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
4001 /* If the constant is part of an object_block, make sure that
4002 the constant has been positioned within its block, but do not
4003 write out its definition yet. output_object_blocks will do
4005 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
4006 && SYMBOL_REF_BLOCK (desc
->sym
))
4007 place_block_symbol (desc
->sym
);
4010 switch_to_section (targetm
.asm_out
.select_rtx_section
4011 (desc
->mode
, desc
->constant
, desc
->align
));
4012 output_constant_pool_1 (desc
, desc
->align
);
4017 /* Mark all constants that are used in the current function, then write
4018 out the function's private constant pool. */
4021 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
4022 tree fndecl ATTRIBUTE_UNUSED
)
4024 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
4026 /* It is possible for gcc to call force_const_mem and then to later
4027 discard the instructions which refer to the constant. In such a
4028 case we do not need to output the constant. */
4029 mark_constant_pool ();
4031 #ifdef ASM_OUTPUT_POOL_PROLOGUE
4032 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4035 output_constant_pool_contents (pool
);
4037 #ifdef ASM_OUTPUT_POOL_EPILOGUE
4038 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4042 /* Write the contents of the shared constant pool. */
4045 output_shared_constant_pool (void)
4047 output_constant_pool_contents (shared_constant_pool
);
4050 /* Determine what kind of relocations EXP may need. */
4053 compute_reloc_for_constant (tree exp
)
4055 int reloc
= 0, reloc2
;
4058 switch (TREE_CODE (exp
))
4062 /* Go inside any operations that get_inner_reference can handle and see
4063 if what's inside is a constant: no need to do anything here for
4064 addresses of variables or functions. */
4065 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4066 tem
= TREE_OPERAND (tem
, 0))
4069 if (TREE_CODE (tem
) == MEM_REF
4070 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
4072 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
4076 if (!targetm
.binds_local_p (tem
))
4083 case POINTER_PLUS_EXPR
:
4084 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4085 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4089 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4090 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4091 /* The difference of two local labels is computable at link time. */
4092 if (reloc
== 1 && reloc2
== 1)
4099 case VIEW_CONVERT_EXPR
:
4100 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4105 unsigned HOST_WIDE_INT idx
;
4106 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4108 reloc
|= compute_reloc_for_constant (tem
);
4118 /* Find all the constants whose addresses are referenced inside of EXP,
4119 and make sure assembler code with a label has been output for each one.
4120 Indicate whether an ADDR_EXPR has been encountered. */
4123 output_addressed_constants (tree exp
)
4127 switch (TREE_CODE (exp
))
4131 /* Go inside any operations that get_inner_reference can handle and see
4132 if what's inside is a constant: no need to do anything here for
4133 addresses of variables or functions. */
4134 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4135 tem
= TREE_OPERAND (tem
, 0))
4138 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4139 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4140 tem
= DECL_INITIAL (tem
);
4142 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4143 output_constant_def (tem
, 0);
4145 if (TREE_CODE (tem
) == MEM_REF
)
4146 output_addressed_constants (TREE_OPERAND (tem
, 0));
4150 case POINTER_PLUS_EXPR
:
4152 output_addressed_constants (TREE_OPERAND (exp
, 1));
4156 case VIEW_CONVERT_EXPR
:
4157 output_addressed_constants (TREE_OPERAND (exp
, 0));
4162 unsigned HOST_WIDE_INT idx
;
4163 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4165 output_addressed_constants (tem
);
4174 /* Whether a constructor CTOR is a valid static constant initializer if all
4175 its elements are. This used to be internal to initializer_constant_valid_p
4176 and has been exposed to let other functions like categorize_ctor_elements
4177 evaluate the property while walking a constructor for other purposes. */
4180 constructor_static_from_elts_p (const_tree ctor
)
4182 return (TREE_CONSTANT (ctor
)
4183 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4184 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4185 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4188 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4191 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4192 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4193 which are valid when ENDTYPE is an integer of any size; in
4194 particular, this does not accept a pointer minus a constant. This
4195 returns null_pointer_node if the VALUE is an absolute constant
4196 which can be used to initialize a static variable. Otherwise it
4200 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4204 if (!INTEGRAL_TYPE_P (endtype
))
4207 op0
= TREE_OPERAND (value
, 0);
4208 op1
= TREE_OPERAND (value
, 1);
4210 /* Like STRIP_NOPS except allow the operand mode to widen. This
4211 works around a feature of fold that simplifies (int)(p1 - p2) to
4212 ((int)p1 - (int)p2) under the theory that the narrower operation
4215 while (CONVERT_EXPR_P (op0
)
4216 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4218 tree inner
= TREE_OPERAND (op0
, 0);
4219 if (inner
== error_mark_node
4220 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4221 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4222 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4227 while (CONVERT_EXPR_P (op1
)
4228 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4230 tree inner
= TREE_OPERAND (op1
, 0);
4231 if (inner
== error_mark_node
4232 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4233 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4234 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4239 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4243 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4244 cache
? cache
+ 2 : NULL
);
4245 /* Both initializers must be known. */
4249 && (op0
== null_pointer_node
4250 || TREE_CODE (value
) == MINUS_EXPR
))
4251 return null_pointer_node
;
4253 /* Support differences between labels. */
4254 if (TREE_CODE (op0
) == LABEL_DECL
4255 && TREE_CODE (op1
) == LABEL_DECL
)
4256 return null_pointer_node
;
4258 if (TREE_CODE (op0
) == STRING_CST
4259 && TREE_CODE (op1
) == STRING_CST
4260 && operand_equal_p (op0
, op1
, 1))
4261 return null_pointer_node
;
4267 /* Helper function of initializer_constant_valid_p.
4268 Return nonzero if VALUE is a valid constant-valued expression
4269 for use in initializing a static variable; one that can be an
4270 element of a "constant" initializer.
4272 Return null_pointer_node if the value is absolute;
4273 if it is relocatable, return the variable that determines the relocation.
4274 We assume that VALUE has been folded as much as possible;
4275 therefore, we do not need to check for such things as
4276 arithmetic-combinations of integers.
4278 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4281 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4285 switch (TREE_CODE (value
))
4288 if (constructor_static_from_elts_p (value
))
4290 unsigned HOST_WIDE_INT idx
;
4292 bool absolute
= true;
4294 if (cache
&& cache
[0] == value
)
4296 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4299 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4306 cache
[1] = NULL_TREE
;
4310 if (reloc
!= null_pointer_node
)
4313 /* For a non-absolute relocation, there is no single
4314 variable that can be "the variable that determines the
4319 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4321 return absolute
? null_pointer_node
: error_mark_node
;
4324 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4332 return null_pointer_node
;
4337 tree op0
= staticp (TREE_OPERAND (value
, 0));
4340 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4341 to be a constant, this is old-skool offsetof-like nonsense. */
4342 if (TREE_CODE (op0
) == INDIRECT_REF
4343 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4344 return null_pointer_node
;
4345 /* Taking the address of a nested function involves a trampoline,
4346 unless we don't need or want one. */
4347 if (TREE_CODE (op0
) == FUNCTION_DECL
4348 && DECL_STATIC_CHAIN (op0
)
4349 && !TREE_NO_TRAMPOLINE (value
))
4351 /* "&{...}" requires a temporary to hold the constructed
4353 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4359 case NON_LVALUE_EXPR
:
4360 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4363 case VIEW_CONVERT_EXPR
:
4365 tree src
= TREE_OPERAND (value
, 0);
4366 tree src_type
= TREE_TYPE (src
);
4367 tree dest_type
= TREE_TYPE (value
);
4369 /* Allow view-conversions from aggregate to non-aggregate type only
4370 if the bit pattern is fully preserved afterwards; otherwise, the
4371 RTL expander won't be able to apply a subsequent transformation
4372 to the underlying constructor. */
4373 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4375 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4376 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4381 /* Allow all other kinds of view-conversion. */
4382 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4387 tree src
= TREE_OPERAND (value
, 0);
4388 tree src_type
= TREE_TYPE (src
);
4389 tree dest_type
= TREE_TYPE (value
);
4391 /* Allow conversions between pointer types, floating-point
4392 types, and offset types. */
4393 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4394 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4395 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4396 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4397 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4399 /* Allow length-preserving conversions between integer types. */
4400 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4401 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4402 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4404 /* Allow conversions between other integer types only if
4406 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4408 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4409 if (inner
== null_pointer_node
)
4410 return null_pointer_node
;
4414 /* Allow (int) &foo provided int is as wide as a pointer. */
4415 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4416 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4417 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4419 /* Likewise conversions from int to pointers, but also allow
4420 conversions from 0. */
4421 if ((POINTER_TYPE_P (dest_type
)
4422 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4423 && INTEGRAL_TYPE_P (src_type
))
4425 if (TREE_CODE (src
) == INTEGER_CST
4426 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4427 return null_pointer_node
;
4428 if (integer_zerop (src
))
4429 return null_pointer_node
;
4430 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4431 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4434 /* Allow conversions to struct or union types if the value
4436 if (TREE_CODE (dest_type
) == RECORD_TYPE
4437 || TREE_CODE (dest_type
) == UNION_TYPE
)
4438 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4442 case POINTER_PLUS_EXPR
:
4444 /* Any valid floating-point constants will have been folded by now;
4445 with -frounding-math we hit this with addition of two constants. */
4446 if (TREE_CODE (endtype
) == REAL_TYPE
)
4448 if (cache
&& cache
[0] == value
)
4450 if (! INTEGRAL_TYPE_P (endtype
)
4451 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4453 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4455 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4458 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4459 endtype
, ncache
+ 2);
4460 /* If either term is absolute, use the other term's relocation. */
4461 if (valid0
== null_pointer_node
)
4463 else if (valid1
== null_pointer_node
)
4465 /* Support narrowing pointer differences. */
4467 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4471 /* Support narrowing pointer differences. */
4472 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4481 if (TREE_CODE (endtype
) == REAL_TYPE
)
4483 if (cache
&& cache
[0] == value
)
4485 if (! INTEGRAL_TYPE_P (endtype
)
4486 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4488 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4490 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4493 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4494 endtype
, ncache
+ 2);
4495 /* Win if second argument is absolute. */
4496 if (valid1
== null_pointer_node
)
4498 /* Win if both arguments have the same relocation.
4499 Then the value is absolute. */
4500 else if (valid0
== valid1
&& valid0
!= 0)
4501 ret
= null_pointer_node
;
4502 /* Since GCC guarantees that string constants are unique in the
4503 generated code, a subtraction between two copies of the same
4504 constant string is absolute. */
4505 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4506 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4507 && operand_equal_p (valid0
, valid1
, 1))
4508 ret
= null_pointer_node
;
4509 /* Support narrowing differences. */
4511 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4515 /* Support narrowing differences. */
4516 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4531 /* Return nonzero if VALUE is a valid constant-valued expression
4532 for use in initializing a static variable; one that can be an
4533 element of a "constant" initializer.
4535 Return null_pointer_node if the value is absolute;
4536 if it is relocatable, return the variable that determines the relocation.
4537 We assume that VALUE has been folded as much as possible;
4538 therefore, we do not need to check for such things as
4539 arithmetic-combinations of integers. */
4541 initializer_constant_valid_p (tree value
, tree endtype
)
4543 return initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4546 /* Return true if VALUE is a valid constant-valued expression
4547 for use in initializing a static bit-field; one that can be
4548 an element of a "constant" initializer. */
4551 initializer_constant_valid_for_bitfield_p (tree value
)
4553 /* For bitfields we support integer constants or possibly nested aggregates
4555 switch (TREE_CODE (value
))
4559 unsigned HOST_WIDE_INT idx
;
4562 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4563 if (!initializer_constant_valid_for_bitfield_p (elt
))
4572 case VIEW_CONVERT_EXPR
:
4573 case NON_LVALUE_EXPR
:
4575 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4584 /* output_constructor outer state of relevance in recursive calls, typically
4585 for nested aggregate bitfields. */
4588 unsigned int bit_offset
; /* current position in ... */
4589 int byte
; /* ... the outer byte buffer. */
4592 static unsigned HOST_WIDE_INT
4593 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int,
4596 /* Output assembler code for constant EXP, with no label.
4597 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4598 Assumes output_addressed_constants has been done on EXP already.
4600 Generate at least SIZE bytes of assembler data, padding at the end
4601 with zeros if necessary. SIZE must always be specified. The returned
4602 value is the actual number of bytes of assembler data generated, which
4603 may be bigger than SIZE if the object contains a variable length field.
4605 SIZE is important for structure constructors,
4606 since trailing members may have been omitted from the constructor.
4607 It is also important for initialization of arrays from string constants
4608 since the full length of the string constant might not be wanted.
4609 It is also needed for initialization of unions, where the initializer's
4610 type is just one member, and that may not be as long as the union.
4612 There a case in which we would fail to output exactly SIZE bytes:
4613 for a structure constructor that wants to produce more than SIZE bytes.
4614 But such constructors will never be generated for any possible input.
4616 ALIGN is the alignment of the data in bits. */
4618 static unsigned HOST_WIDE_INT
4619 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4621 enum tree_code code
;
4622 unsigned HOST_WIDE_INT thissize
;
4624 if (size
== 0 || flag_syntax_only
)
4627 /* See if we're trying to initialize a pointer in a non-default mode
4628 to the address of some declaration somewhere. If the target says
4629 the mode is valid for pointers, assume the target has a way of
4631 if (TREE_CODE (exp
) == NOP_EXPR
4632 && POINTER_TYPE_P (TREE_TYPE (exp
))
4633 && targetm
.addr_space
.valid_pointer_mode
4634 (TYPE_MODE (TREE_TYPE (exp
)),
4635 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4637 tree saved_type
= TREE_TYPE (exp
);
4639 /* Peel off any intermediate conversions-to-pointer for valid
4641 while (TREE_CODE (exp
) == NOP_EXPR
4642 && POINTER_TYPE_P (TREE_TYPE (exp
))
4643 && targetm
.addr_space
.valid_pointer_mode
4644 (TYPE_MODE (TREE_TYPE (exp
)),
4645 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4646 exp
= TREE_OPERAND (exp
, 0);
4648 /* If what we're left with is the address of something, we can
4649 convert the address to the final type and output it that
4651 if (TREE_CODE (exp
) == ADDR_EXPR
)
4652 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4653 /* Likewise for constant ints. */
4654 else if (TREE_CODE (exp
) == INTEGER_CST
)
4655 exp
= wide_int_to_tree (saved_type
, exp
);
4659 /* Eliminate any conversions since we'll be outputting the underlying
4661 while (CONVERT_EXPR_P (exp
)
4662 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4663 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4665 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4666 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4668 /* Make sure eliminating the conversion is really a no-op, except with
4669 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4670 union types to allow for Ada unchecked unions. */
4671 if (type_size
> op_size
4672 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4673 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4674 /* Keep the conversion. */
4677 exp
= TREE_OPERAND (exp
, 0);
4680 code
= TREE_CODE (TREE_TYPE (exp
));
4681 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4683 /* Allow a constructor with no elements for any data type.
4684 This means to fill the space with zeros. */
4685 if (TREE_CODE (exp
) == CONSTRUCTOR
4686 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4688 assemble_zeros (size
);
4692 if (TREE_CODE (exp
) == FDESC_EXPR
)
4694 #ifdef ASM_OUTPUT_FDESC
4695 HOST_WIDE_INT part
= tree_to_shwi (TREE_OPERAND (exp
, 1));
4696 tree decl
= TREE_OPERAND (exp
, 0);
4697 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4704 /* Now output the underlying data. If we've handling the padding, return.
4705 Otherwise, break and ensure SIZE is the size written. */
4712 case REFERENCE_TYPE
:
4714 case FIXED_POINT_TYPE
:
4715 case POINTER_BOUNDS_TYPE
:
4717 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4718 EXPAND_INITIALIZER
),
4719 MIN (size
, thissize
), align
, 0))
4720 error ("initializer for integer/fixed-point value is too complicated");
4724 if (TREE_CODE (exp
) != REAL_CST
)
4725 error ("initializer for floating value is not a floating constant");
4727 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4731 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4732 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4733 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4738 switch (TREE_CODE (exp
))
4741 return output_constructor (exp
, size
, align
, NULL
);
4744 = MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
), size
);
4745 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4749 machine_mode inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4750 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4751 int elt_size
= GET_MODE_SIZE (inner
);
4752 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
);
4753 thissize
= elt_size
;
4754 for (unsigned int i
= 1; i
< VECTOR_CST_NELTS (exp
); i
++)
4756 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
);
4757 thissize
+= elt_size
;
4768 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4769 return output_constructor (exp
, size
, align
, NULL
);
4778 if (size
> thissize
)
4779 assemble_zeros (size
- thissize
);
4785 /* Subroutine of output_constructor, used for computing the size of
4786 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4787 type with an unspecified upper bound. */
4789 static unsigned HOST_WIDE_INT
4790 array_size_for_constructor (tree val
)
4793 unsigned HOST_WIDE_INT cnt
;
4794 tree index
, value
, tmp
;
4797 /* This code used to attempt to handle string constants that are not
4798 arrays of single-bytes, but nothing else does, so there's no point in
4800 if (TREE_CODE (val
) == STRING_CST
)
4801 return TREE_STRING_LENGTH (val
);
4803 max_index
= NULL_TREE
;
4804 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4806 if (TREE_CODE (index
) == RANGE_EXPR
)
4807 index
= TREE_OPERAND (index
, 1);
4808 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4812 if (max_index
== NULL_TREE
)
4815 /* Compute the total number of array elements. */
4816 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4817 i
= wi::to_offset (max_index
) - wi::to_offset (tmp
) + 1;
4819 /* Multiply by the array element unit size to find number of bytes. */
4820 i
*= wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4822 gcc_assert (wi::fits_uhwi_p (i
));
4823 return i
.to_uhwi ();
4826 /* Other datastructures + helpers for output_constructor. */
4828 /* output_constructor local state to support interaction with helpers. */
4832 /* Received arguments. */
4833 tree exp
; /* Constructor expression. */
4834 tree type
; /* Type of constructor expression. */
4835 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4836 unsigned int align
; /* Known initial alignment. */
4837 tree min_index
; /* Lower bound if specified for an array. */
4839 /* Output processing state. */
4840 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4841 int byte
; /* Part of a bitfield byte yet to be output. */
4842 int last_relative_index
; /* Implicit or explicit index of the last
4843 array element output within a bitfield. */
4844 bool byte_buffer_in_use
; /* Whether BYTE is in use. */
4846 /* Current element. */
4847 tree field
; /* Current field decl in a record. */
4848 tree val
; /* Current element value. */
4849 tree index
; /* Current element index. */
4853 /* Helper for output_constructor. From the current LOCAL state, output a
4854 RANGE_EXPR element. */
4857 output_constructor_array_range (oc_local_state
*local
)
4859 unsigned HOST_WIDE_INT fieldsize
4860 = int_size_in_bytes (TREE_TYPE (local
->type
));
4862 HOST_WIDE_INT lo_index
4863 = tree_to_shwi (TREE_OPERAND (local
->index
, 0));
4864 HOST_WIDE_INT hi_index
4865 = tree_to_shwi (TREE_OPERAND (local
->index
, 1));
4866 HOST_WIDE_INT index
;
4869 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4871 for (index
= lo_index
; index
<= hi_index
; index
++)
4873 /* Output the element's initial value. */
4874 if (local
->val
== NULL_TREE
)
4875 assemble_zeros (fieldsize
);
4877 fieldsize
= output_constant (local
->val
, fieldsize
, align2
);
4879 /* Count its size. */
4880 local
->total_bytes
+= fieldsize
;
4884 /* Helper for output_constructor. From the current LOCAL state, output a
4885 field element that is not true bitfield or part of an outer one. */
4888 output_constructor_regular_field (oc_local_state
*local
)
4890 /* Field size and position. Since this structure is static, we know the
4891 positions are constant. */
4892 unsigned HOST_WIDE_INT fieldsize
;
4893 HOST_WIDE_INT fieldpos
;
4895 unsigned int align2
;
4897 if (local
->index
!= NULL_TREE
)
4899 /* Perform the index calculation in modulo arithmetic but
4900 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4901 but we are using an unsigned sizetype. */
4902 unsigned prec
= TYPE_PRECISION (sizetype
);
4903 offset_int idx
= wi::sext (wi::to_offset (local
->index
)
4904 - wi::to_offset (local
->min_index
), prec
);
4905 fieldpos
= (idx
* wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
))))
4908 else if (local
->field
!= NULL_TREE
)
4909 fieldpos
= int_byte_position (local
->field
);
4913 /* Output any buffered-up bit-fields preceding this element. */
4914 if (local
->byte_buffer_in_use
)
4916 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4917 local
->total_bytes
++;
4918 local
->byte_buffer_in_use
= false;
4921 /* Advance to offset of this element.
4922 Note no alignment needed in an array, since that is guaranteed
4923 if each element has the proper size. */
4924 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4925 && fieldpos
> local
->total_bytes
)
4927 assemble_zeros (fieldpos
- local
->total_bytes
);
4928 local
->total_bytes
= fieldpos
;
4931 /* Find the alignment of this element. */
4932 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
4934 /* Determine size this element should occupy. */
4939 /* If this is an array with an unspecified upper bound,
4940 the initializer determines the size. */
4941 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4942 but we cannot do this until the deprecated support for
4943 initializing zero-length array members is removed. */
4944 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
4945 && TYPE_DOMAIN (TREE_TYPE (local
->field
))
4946 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
))))
4948 fieldsize
= array_size_for_constructor (local
->val
);
4949 /* Given a non-empty initialization, this field had
4951 gcc_assert (!fieldsize
|| !DECL_CHAIN (local
->field
));
4954 fieldsize
= tree_to_uhwi (DECL_SIZE_UNIT (local
->field
));
4957 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
4959 /* Output the element's initial value. */
4960 if (local
->val
== NULL_TREE
)
4961 assemble_zeros (fieldsize
);
4963 fieldsize
= output_constant (local
->val
, fieldsize
, align2
);
4965 /* Count its size. */
4966 local
->total_bytes
+= fieldsize
;
4969 /* Helper for output_constructor. From the LOCAL state, output an element
4970 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
4971 from the start of a possibly ongoing outer byte buffer. */
4974 output_constructor_bitfield (oc_local_state
*local
, unsigned int bit_offset
)
4976 /* Bit size of this element. */
4977 HOST_WIDE_INT ebitsize
4979 ? tree_to_uhwi (DECL_SIZE (local
->field
))
4980 : tree_to_uhwi (TYPE_SIZE (TREE_TYPE (local
->type
))));
4982 /* Relative index of this element if this is an array component. */
4983 HOST_WIDE_INT relative_index
4986 ? (tree_to_shwi (local
->index
)
4987 - tree_to_shwi (local
->min_index
))
4988 : local
->last_relative_index
+ 1)
4991 /* Bit position of this element from the start of the containing
4993 HOST_WIDE_INT constructor_relative_ebitpos
4995 ? int_bit_position (local
->field
)
4996 : ebitsize
* relative_index
);
4998 /* Bit position of this element from the start of a possibly ongoing
4999 outer byte buffer. */
5000 HOST_WIDE_INT byte_relative_ebitpos
5001 = bit_offset
+ constructor_relative_ebitpos
;
5003 /* From the start of a possibly ongoing outer byte buffer, offsets to
5004 the first bit of this element and to the first bit past the end of
5006 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
5007 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
5009 local
->last_relative_index
= relative_index
;
5011 if (local
->val
== NULL_TREE
)
5012 local
->val
= integer_zero_node
;
5014 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
5015 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
5016 local
->val
= TREE_OPERAND (local
->val
, 0);
5018 if (TREE_CODE (local
->val
) != INTEGER_CST
5019 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
5021 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
5025 /* If this field does not start in this (or next) byte, skip some bytes. */
5026 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5028 /* Output remnant of any bit field in previous bytes. */
5029 if (local
->byte_buffer_in_use
)
5031 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5032 local
->total_bytes
++;
5033 local
->byte_buffer_in_use
= false;
5036 /* If still not at proper byte, advance to there. */
5037 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5039 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
5040 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
5041 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
5045 /* Set up the buffer if necessary. */
5046 if (!local
->byte_buffer_in_use
)
5050 local
->byte_buffer_in_use
= true;
5053 /* If this is nested constructor, recurse passing the bit offset and the
5054 pending data, then retrieve the new pending data afterwards. */
5055 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
5057 oc_outer_state temp_state
;
5058 temp_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
5059 temp_state
.byte
= local
->byte
;
5061 += output_constructor (local
->val
, 0, 0, &temp_state
);
5062 local
->byte
= temp_state
.byte
;
5066 /* Otherwise, we must split the element into pieces that fall within
5067 separate bytes, and combine each byte with previous or following
5069 while (next_offset
< end_offset
)
5073 HOST_WIDE_INT value
;
5074 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
5075 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
5077 /* Advance from byte to byte within this element when necessary. */
5078 while (next_byte
!= local
->total_bytes
)
5080 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5081 local
->total_bytes
++;
5085 /* Number of bits we can process at once (all part of the same byte). */
5086 this_time
= MIN (end_offset
- next_offset
, BITS_PER_UNIT
- next_bit
);
5087 if (BYTES_BIG_ENDIAN
)
5089 /* On big-endian machine, take the most significant bits (of the
5090 bits that are significant) first and put them into bytes from
5091 the most significant end. */
5092 shift
= end_offset
- next_offset
- this_time
;
5094 /* Don't try to take a bunch of bits that cross
5095 the word boundary in the INTEGER_CST. We can
5096 only select bits from one element. */
5097 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5098 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5100 const int end
= shift
+ this_time
- 1;
5101 shift
= end
& -HOST_BITS_PER_WIDE_INT
;
5102 this_time
= end
- shift
+ 1;
5105 /* Now get the bits from the appropriate constant word. */
5106 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5107 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5109 /* Get the result. This works only when:
5110 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5111 local
->byte
|= (((value
>> shift
)
5112 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5113 << (BITS_PER_UNIT
- this_time
- next_bit
));
5117 /* On little-endian machines, take the least significant bits of
5118 the value first and pack them starting at the least significant
5119 bits of the bytes. */
5120 shift
= next_offset
- byte_relative_ebitpos
;
5122 /* Don't try to take a bunch of bits that cross
5123 the word boundary in the INTEGER_CST. We can
5124 only select bits from one element. */
5125 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5126 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5128 = HOST_BITS_PER_WIDE_INT
- (shift
& (HOST_BITS_PER_WIDE_INT
- 1));
5130 /* Now get the bits from the appropriate constant word. */
5131 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5132 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5134 /* Get the result. This works only when:
5135 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5136 local
->byte
|= (((value
>> shift
)
5137 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5141 next_offset
+= this_time
;
5142 local
->byte_buffer_in_use
= true;
5146 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5147 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5148 caller output state of relevance in recursive invocations. */
5150 static unsigned HOST_WIDE_INT
5151 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
5152 unsigned int align
, oc_outer_state
*outer
)
5154 unsigned HOST_WIDE_INT cnt
;
5155 constructor_elt
*ce
;
5157 oc_local_state local
;
5159 /* Setup our local state to communicate with helpers. */
5161 local
.type
= TREE_TYPE (exp
);
5163 local
.align
= align
;
5164 if (TREE_CODE (local
.type
) == ARRAY_TYPE
&& TYPE_DOMAIN (local
.type
))
5165 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5167 local
.min_index
= NULL_TREE
;
5169 local
.total_bytes
= 0;
5170 local
.byte_buffer_in_use
= outer
!= NULL
;
5171 local
.byte
= outer
? outer
->byte
: 0;
5172 local
.last_relative_index
= -1;
5174 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5176 /* As CE goes through the elements of the constant, FIELD goes through the
5177 structure fields if the constant is a structure. If the constant is a
5178 union, we override this by getting the field from the TREE_LIST element.
5179 But the constant could also be an array. Then FIELD is zero.
5181 There is always a maximum of one element in the chain LINK for unions
5182 (even if the initializer in a source program incorrectly contains
5185 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5186 local
.field
= TYPE_FIELDS (local
.type
);
5188 local
.field
= NULL_TREE
;
5191 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5192 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5194 local
.val
= ce
->value
;
5195 local
.index
= NULL_TREE
;
5197 /* The element in a union constructor specifies the proper field
5199 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5200 local
.field
= ce
->index
;
5202 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5203 local
.index
= ce
->index
;
5205 if (local
.field
&& flag_verbose_asm
)
5206 fprintf (asm_out_file
, "%s %s:\n",
5208 DECL_NAME (local
.field
)
5209 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5212 /* Eliminate the marker that makes a cast not be an lvalue. */
5213 if (local
.val
!= NULL_TREE
)
5214 STRIP_NOPS (local
.val
);
5216 /* Output the current element, using the appropriate helper ... */
5218 /* For an array slice not part of an outer bitfield. */
5220 && local
.index
!= NULL_TREE
5221 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5222 output_constructor_array_range (&local
);
5224 /* For a field that is neither a true bitfield nor part of an outer one,
5225 known to be at least byte aligned and multiple-of-bytes long. */
5227 && (local
.field
== NULL_TREE
5228 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5229 output_constructor_regular_field (&local
);
5231 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5232 supported for scalar fields, so we may need to convert first. */
5235 if (TREE_CODE (local
.val
) == REAL_CST
)
5237 = fold_unary (VIEW_CONVERT_EXPR
,
5238 build_nonstandard_integer_type
5239 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5241 output_constructor_bitfield (&local
, outer
? outer
->bit_offset
: 0);
5245 /* If we are not at toplevel, save the pending data for our caller.
5246 Otherwise output the pending data and padding zeros as needed. */
5248 outer
->byte
= local
.byte
;
5251 if (local
.byte_buffer_in_use
)
5253 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5254 local
.total_bytes
++;
5257 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5259 assemble_zeros (local
.size
- local
.total_bytes
);
5260 local
.total_bytes
= local
.size
;
5264 return local
.total_bytes
;
5267 /* Mark DECL as weak. */
5270 mark_weak (tree decl
)
5272 if (DECL_WEAK (decl
))
5275 struct symtab_node
*n
= symtab_node::get (decl
);
5276 if (n
&& n
->refuse_visibility_changes
)
5277 error ("%+D declared weak after being used", decl
);
5278 DECL_WEAK (decl
) = 1;
5280 if (DECL_RTL_SET_P (decl
)
5281 && MEM_P (DECL_RTL (decl
))
5282 && XEXP (DECL_RTL (decl
), 0)
5283 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5284 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5287 /* Merge weak status between NEWDECL and OLDDECL. */
5290 merge_weak (tree newdecl
, tree olddecl
)
5292 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5294 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5297 /* We put the NEWDECL on the weak_decls list at some point
5298 and OLDDECL as well. Keep just OLDDECL on the list. */
5299 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5300 if (TREE_VALUE (*pwd
) == newdecl
)
5302 *pwd
= TREE_CHAIN (*pwd
);
5309 if (DECL_WEAK (newdecl
))
5313 /* NEWDECL is weak, but OLDDECL is not. */
5315 /* If we already output the OLDDECL, we're in trouble; we can't
5316 go back and make it weak. This should never happen in
5317 unit-at-a-time compilation. */
5318 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5320 /* If we've already generated rtl referencing OLDDECL, we may
5321 have done so in a way that will not function properly with
5322 a weak symbol. Again in unit-at-a-time this should be
5324 gcc_assert (!TREE_USED (olddecl
)
5325 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5327 if (TARGET_SUPPORTS_WEAK
)
5329 /* We put the NEWDECL on the weak_decls list at some point.
5330 Replace it with the OLDDECL. */
5331 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5332 if (TREE_VALUE (wd
) == newdecl
)
5334 TREE_VALUE (wd
) = olddecl
;
5337 /* We may not find the entry on the list. If NEWDECL is a
5338 weak alias, then we will have already called
5339 globalize_decl to remove the entry; in that case, we do
5340 not need to do anything. */
5343 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5344 mark_weak (olddecl
);
5347 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5348 weak. Just update NEWDECL to indicate that it's weak too. */
5349 mark_weak (newdecl
);
5352 /* Declare DECL to be a weak symbol. */
5355 declare_weak (tree decl
)
5357 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5358 if (! TREE_PUBLIC (decl
))
5359 error ("weak declaration of %q+D must be public", decl
);
5360 else if (!TARGET_SUPPORTS_WEAK
)
5361 warning (0, "weak declaration of %q+D not supported", decl
);
5364 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5365 DECL_ATTRIBUTES (decl
)
5366 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5370 weak_finish_1 (tree decl
)
5372 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5373 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5376 if (! TREE_USED (decl
))
5379 #ifdef ASM_WEAKEN_DECL
5380 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5382 #ifdef ASM_WEAKEN_LABEL
5383 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5385 #ifdef ASM_OUTPUT_WEAK_ALIAS
5387 static bool warn_once
= 0;
5390 warning (0, "only weak aliases are supported in this configuration");
5400 /* Fiven an assembly name, find the decl it is associated with. */
5402 find_decl (tree target
)
5404 symtab_node
*node
= symtab_node::get_for_asmname (target
);
5410 /* This TREE_LIST contains weakref targets. */
5412 static GTY(()) tree weakref_targets
;
5414 /* Emit any pending weak declarations. */
5421 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5423 tree alias_decl
= TREE_PURPOSE (t
);
5424 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5426 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5427 /* Remove alias_decl from the weak list, but leave entries for
5428 the target alone. */
5430 #ifndef ASM_OUTPUT_WEAKREF
5431 else if (! TREE_SYMBOL_REFERENCED (target
))
5433 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5434 defined, otherwise we and weak_finish_1 would use
5435 different macros. */
5436 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5437 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5439 tree decl
= find_decl (target
);
5443 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5444 TREE_CODE (alias_decl
), target
,
5445 TREE_TYPE (alias_decl
));
5447 DECL_EXTERNAL (decl
) = 1;
5448 TREE_PUBLIC (decl
) = 1;
5449 DECL_ARTIFICIAL (decl
) = 1;
5450 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5451 TREE_USED (decl
) = 1;
5454 weak_finish_1 (decl
);
5463 /* Remove the alias and the target from the pending weak list
5464 so that we do not emit any .weak directives for the former,
5465 nor multiple .weak directives for the latter. */
5466 for (p
= &weak_decls
; (t2
= *p
) ; )
5468 if (TREE_VALUE (t2
) == alias_decl
5469 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5470 *p
= TREE_CHAIN (t2
);
5472 p
= &TREE_CHAIN (t2
);
5475 /* Remove other weakrefs to the same target, to speed things up. */
5476 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5478 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5479 *p
= TREE_CHAIN (t2
);
5481 p
= &TREE_CHAIN (t2
);
5486 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5488 tree decl
= TREE_VALUE (t
);
5490 weak_finish_1 (decl
);
5494 /* Emit the assembly bits to indicate that DECL is globally visible. */
5497 globalize_decl (tree decl
)
5500 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5501 if (DECL_WEAK (decl
))
5503 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5506 #ifdef ASM_WEAKEN_DECL
5507 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5509 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5512 /* Remove this function from the pending weak list so that
5513 we do not emit multiple .weak directives for it. */
5514 for (p
= &weak_decls
; (t
= *p
) ; )
5516 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5517 *p
= TREE_CHAIN (t
);
5519 p
= &TREE_CHAIN (t
);
5522 /* Remove weakrefs to the same target from the pending weakref
5523 list, for the same reason. */
5524 for (p
= &weakref_targets
; (t
= *p
) ; )
5526 if (DECL_ASSEMBLER_NAME (decl
)
5527 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5528 *p
= TREE_CHAIN (t
);
5530 p
= &TREE_CHAIN (t
);
5537 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5540 vec
<alias_pair
, va_gc
> *alias_pairs
;
5542 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5543 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5544 tree node is DECL to have the value of the tree node TARGET. */
5547 do_assemble_alias (tree decl
, tree target
)
5551 /* Emulated TLS had better not get this var. */
5552 gcc_assert (!(!targetm
.have_tls
5553 && TREE_CODE (decl
) == VAR_DECL
5554 && DECL_THREAD_LOCAL_P (decl
)));
5556 if (TREE_ASM_WRITTEN (decl
))
5559 id
= DECL_ASSEMBLER_NAME (decl
);
5560 ultimate_transparent_alias_target (&id
);
5562 /* We must force creation of DECL_RTL for debug info generation, even though
5563 we don't use it here. */
5564 make_decl_rtl (decl
);
5566 TREE_ASM_WRITTEN (decl
) = 1;
5567 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5568 TREE_ASM_WRITTEN (id
) = 1;
5570 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5572 ultimate_transparent_alias_target (&target
);
5574 if (!TREE_SYMBOL_REFERENCED (target
))
5575 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5577 #ifdef ASM_OUTPUT_WEAKREF
5578 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5579 IDENTIFIER_POINTER (id
),
5580 IDENTIFIER_POINTER (target
));
5582 if (!TARGET_SUPPORTS_WEAK
)
5584 error_at (DECL_SOURCE_LOCATION (decl
),
5585 "weakref is not supported in this configuration");
5592 #ifdef ASM_OUTPUT_DEF
5593 tree orig_decl
= decl
;
5595 if (TREE_CODE (decl
) == FUNCTION_DECL
5596 && cgraph_node::get (decl
)->instrumentation_clone
5597 && cgraph_node::get (decl
)->instrumented_version
)
5598 orig_decl
= cgraph_node::get (decl
)->instrumented_version
->decl
;
5600 /* Make name accessible from other files, if appropriate. */
5602 if (TREE_PUBLIC (decl
) || TREE_PUBLIC (orig_decl
))
5604 globalize_decl (decl
);
5605 maybe_assemble_visibility (decl
);
5607 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5609 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5610 if (targetm
.has_ifunc_p ())
5611 ASM_OUTPUT_TYPE_DIRECTIVE
5612 (asm_out_file
, IDENTIFIER_POINTER (id
),
5616 error_at (DECL_SOURCE_LOCATION (decl
),
5617 "ifunc is not supported on this target");
5620 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5621 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5623 ASM_OUTPUT_DEF (asm_out_file
,
5624 IDENTIFIER_POINTER (id
),
5625 IDENTIFIER_POINTER (target
));
5627 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5632 name
= IDENTIFIER_POINTER (id
);
5633 # ifdef ASM_WEAKEN_DECL
5634 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5636 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5638 /* Remove this function from the pending weak list so that
5639 we do not emit multiple .weak directives for it. */
5640 for (p
= &weak_decls
; (t
= *p
) ; )
5641 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
))
5642 || id
== DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5643 *p
= TREE_CHAIN (t
);
5645 p
= &TREE_CHAIN (t
);
5647 /* Remove weakrefs to the same target from the pending weakref
5648 list, for the same reason. */
5649 for (p
= &weakref_targets
; (t
= *p
) ; )
5651 if (id
== ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5652 *p
= TREE_CHAIN (t
);
5654 p
= &TREE_CHAIN (t
);
5660 /* Emit an assembler directive to make the symbol for DECL an alias to
5661 the symbol for TARGET. */
5664 assemble_alias (tree decl
, tree target
)
5668 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5670 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5672 ultimate_transparent_alias_target (&target
);
5674 if (alias
== target
)
5675 error ("weakref %q+D ultimately targets itself", decl
);
5676 if (TREE_PUBLIC (decl
))
5677 error ("weakref %q+D must have static linkage", decl
);
5681 #if !defined (ASM_OUTPUT_DEF)
5682 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5683 error_at (DECL_SOURCE_LOCATION (decl
),
5684 "alias definitions not supported in this configuration");
5685 TREE_ASM_WRITTEN (decl
) = 1;
5688 if (!DECL_WEAK (decl
))
5690 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5691 error_at (DECL_SOURCE_LOCATION (decl
),
5692 "ifunc is not supported in this configuration");
5694 error_at (DECL_SOURCE_LOCATION (decl
),
5695 "only weak aliases are supported in this configuration");
5696 TREE_ASM_WRITTEN (decl
) = 1;
5702 TREE_USED (decl
) = 1;
5704 /* Allow aliases to aliases. */
5705 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5706 cgraph_node::get_create (decl
)->alias
= true;
5708 varpool_node::get_create (decl
)->alias
= true;
5710 /* If the target has already been emitted, we don't have to queue the
5711 alias. This saves a tad of memory. */
5712 if (symtab
->global_info_ready
)
5713 target_decl
= find_decl (target
);
5716 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5717 || symtab
->state
>= EXPANSION
)
5718 do_assemble_alias (decl
, target
);
5721 alias_pair p
= {decl
, target
};
5722 vec_safe_push (alias_pairs
, p
);
5726 /* Record and output a table of translations from original function
5727 to its transaction aware clone. Note that tm_pure functions are
5728 considered to be their own clone. */
5730 struct tm_clone_hasher
: ggc_cache_hasher
<tree_map
*>
5732 static hashval_t
hash (tree_map
*m
) { return tree_map_hash (m
); }
5733 static bool equal (tree_map
*a
, tree_map
*b
) { return tree_map_eq (a
, b
); }
5735 static void handle_cache_entry (tree_map
*&e
)
5737 if (e
!= HTAB_EMPTY_ENTRY
|| e
!= HTAB_DELETED_ENTRY
)
5739 extern void gt_ggc_mx (tree_map
*&);
5740 if (ggc_marked_p (e
->base
.from
))
5743 e
= static_cast<tree_map
*> (HTAB_DELETED_ENTRY
);
5749 hash_table
<tm_clone_hasher
> *tm_clone_hash
;
5752 record_tm_clone_pair (tree o
, tree n
)
5754 struct tree_map
**slot
, *h
;
5756 if (tm_clone_hash
== NULL
)
5757 tm_clone_hash
= hash_table
<tm_clone_hasher
>::create_ggc (32);
5759 h
= ggc_alloc
<tree_map
> ();
5760 h
->hash
= htab_hash_pointer (o
);
5764 slot
= tm_clone_hash
->find_slot_with_hash (h
, h
->hash
, INSERT
);
5769 get_tm_clone_pair (tree o
)
5773 struct tree_map
*h
, in
;
5776 in
.hash
= htab_hash_pointer (o
);
5777 h
= tm_clone_hash
->find_with_hash (&in
, in
.hash
);
5784 typedef struct tm_alias_pair
5792 /* Dump the actual pairs to the .tm_clone_table section. */
5795 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5799 bool switched
= false;
5801 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5805 struct cgraph_node
*src_n
= cgraph_node::get (src
);
5806 struct cgraph_node
*dst_n
= cgraph_node::get (dst
);
5808 /* The function ipa_tm_create_version() marks the clone as needed if
5809 the original function was needed. But we also mark the clone as
5810 needed if we ever called the clone indirectly through
5811 TM_GETTMCLONE. If neither of these are true, we didn't generate
5812 a clone, and we didn't call it indirectly... no sense keeping it
5813 in the clone table. */
5814 if (!dst_n
|| !dst_n
->definition
)
5817 /* This covers the case where we have optimized the original
5818 function away, and only access the transactional clone. */
5819 if (!src_n
|| !src_n
->definition
)
5824 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5825 assemble_align (POINTER_SIZE
);
5829 assemble_integer (XEXP (DECL_RTL (src
), 0),
5830 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
5831 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5832 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
5836 /* Provide a default for the tm_clone_table section. */
5839 default_clone_table_section (void)
5841 return get_named_section (NULL
, ".tm_clone_table", 3);
5844 /* Helper comparison function for qsorting by the DECL_UID stored in
5845 alias_pair->emitted_diags. */
5848 tm_alias_pair_cmp (const void *x
, const void *y
)
5850 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5851 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5852 if (p1
->uid
< p2
->uid
)
5854 if (p1
->uid
> p2
->uid
)
5860 finish_tm_clone_pairs (void)
5862 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5864 if (tm_clone_hash
== NULL
)
5867 /* We need a determenistic order for the .tm_clone_table, otherwise
5868 we will get bootstrap comparison failures, so dump the hash table
5869 to a vector, sort it, and dump the vector. */
5871 /* Dump the hashtable to a vector. */
5873 hash_table
<tm_clone_hasher
>::iterator iter
;
5874 FOR_EACH_HASH_TABLE_ELEMENT (*tm_clone_hash
, map
, tree_map
*, iter
)
5876 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5877 tm_alias_pairs
.safe_push (p
);
5880 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5883 dump_tm_clone_pairs (tm_alias_pairs
);
5885 tm_clone_hash
->empty ();
5886 tm_clone_hash
= NULL
;
5887 tm_alias_pairs
.release ();
5891 /* Emit an assembler directive to set symbol for DECL visibility to
5892 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5895 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5896 int vis ATTRIBUTE_UNUSED
)
5898 #ifdef HAVE_GAS_HIDDEN
5899 static const char * const visibility_types
[] = {
5900 NULL
, "protected", "hidden", "internal"
5903 const char *name
, *type
;
5905 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5906 type
= visibility_types
[vis
];
5908 fprintf (asm_out_file
, "\t.%s\t", type
);
5909 assemble_name (asm_out_file
, name
);
5910 fprintf (asm_out_file
, "\n");
5912 if (!DECL_ARTIFICIAL (decl
))
5913 warning (OPT_Wattributes
, "visibility attribute not supported "
5914 "in this configuration; ignored");
5918 /* A helper function to call assemble_visibility when needed for a decl. */
5921 maybe_assemble_visibility (tree decl
)
5923 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5925 if (TREE_CODE (decl
) == FUNCTION_DECL
5926 && cgraph_node::get (decl
)
5927 && cgraph_node::get (decl
)->instrumentation_clone
5928 && cgraph_node::get (decl
)->instrumented_version
)
5929 vis
= DECL_VISIBILITY (cgraph_node::get (decl
)->instrumented_version
->decl
);
5931 if (vis
!= VISIBILITY_DEFAULT
)
5933 targetm
.asm_out
.assemble_visibility (decl
, vis
);
5940 /* Returns 1 if the target configuration supports defining public symbols
5941 so that one of them will be chosen at link time instead of generating a
5942 multiply-defined symbol error, whether through the use of weak symbols or
5943 a target-specific mechanism for having duplicates discarded. */
5946 supports_one_only (void)
5948 if (SUPPORTS_ONE_ONLY
)
5950 return TARGET_SUPPORTS_WEAK
;
5953 /* Set up DECL as a public symbol that can be defined in multiple
5954 translation units without generating a linker error. */
5957 make_decl_one_only (tree decl
, tree comdat_group
)
5959 struct symtab_node
*symbol
;
5960 gcc_assert (TREE_CODE (decl
) == VAR_DECL
5961 || TREE_CODE (decl
) == FUNCTION_DECL
);
5963 TREE_PUBLIC (decl
) = 1;
5965 if (TREE_CODE (decl
) == VAR_DECL
)
5966 symbol
= varpool_node::get_create (decl
);
5968 symbol
= cgraph_node::get_create (decl
);
5970 if (SUPPORTS_ONE_ONLY
)
5972 #ifdef MAKE_DECL_ONE_ONLY
5973 MAKE_DECL_ONE_ONLY (decl
);
5975 symbol
->set_comdat_group (comdat_group
);
5977 else if (TREE_CODE (decl
) == VAR_DECL
5978 && (DECL_INITIAL (decl
) == 0
5979 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
5980 DECL_COMMON (decl
) = 1;
5983 gcc_assert (TARGET_SUPPORTS_WEAK
);
5984 DECL_WEAK (decl
) = 1;
5989 init_varasm_once (void)
5991 section_htab
= hash_table
<section_hasher
>::create_ggc (31);
5992 object_block_htab
= hash_table
<object_block_hasher
>::create_ggc (31);
5993 const_desc_htab
= hash_table
<tree_descriptor_hasher
>::create_ggc (1009);
5995 shared_constant_pool
= create_constant_pool ();
5997 #ifdef TEXT_SECTION_ASM_OP
5998 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
5999 TEXT_SECTION_ASM_OP
);
6002 #ifdef DATA_SECTION_ASM_OP
6003 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6004 DATA_SECTION_ASM_OP
);
6007 #ifdef SDATA_SECTION_ASM_OP
6008 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6009 SDATA_SECTION_ASM_OP
);
6012 #ifdef READONLY_DATA_SECTION_ASM_OP
6013 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
6014 READONLY_DATA_SECTION_ASM_OP
);
6017 #ifdef CTORS_SECTION_ASM_OP
6018 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
6019 CTORS_SECTION_ASM_OP
);
6022 #ifdef DTORS_SECTION_ASM_OP
6023 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
6024 DTORS_SECTION_ASM_OP
);
6027 #ifdef BSS_SECTION_ASM_OP
6028 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6029 output_section_asm_op
,
6030 BSS_SECTION_ASM_OP
);
6033 #ifdef SBSS_SECTION_ASM_OP
6034 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6035 output_section_asm_op
,
6036 SBSS_SECTION_ASM_OP
);
6039 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6040 | SECTION_COMMON
, emit_tls_common
);
6041 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6042 | SECTION_COMMON
, emit_local
);
6043 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6044 | SECTION_COMMON
, emit_common
);
6046 #if defined ASM_OUTPUT_ALIGNED_BSS
6047 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
6051 targetm
.asm_out
.init_sections ();
6053 if (readonly_data_section
== NULL
)
6054 readonly_data_section
= text_section
;
6056 #ifdef ASM_OUTPUT_EXTERNAL
6057 pending_assemble_externals_set
= new hash_set
<tree
>;
6062 decl_default_tls_model (const_tree decl
)
6064 enum tls_model kind
;
6067 is_local
= targetm
.binds_local_p (decl
);
6071 kind
= TLS_MODEL_LOCAL_EXEC
;
6073 kind
= TLS_MODEL_INITIAL_EXEC
;
6076 /* Local dynamic is inefficient when we're not combining the
6077 parts of the address. */
6078 else if (optimize
&& is_local
)
6079 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
6081 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
6082 if (kind
< flag_tls_default
)
6083 kind
= flag_tls_default
;
6088 /* Select a set of attributes for section NAME based on the properties
6089 of DECL and whether or not RELOC indicates that DECL's initializer
6090 might contain runtime relocations.
6092 We make the section read-only and executable for a function decl,
6093 read-only for a const data decl, and writable for a non-const data decl. */
6096 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6100 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6101 flags
= SECTION_CODE
;
6104 enum section_category category
6105 = categorize_decl_for_section (decl
, reloc
);
6106 if (decl_readonly_section_1 (category
))
6108 else if (category
== SECCAT_DATA_REL_RO
6109 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6110 flags
= SECTION_WRITE
| SECTION_RELRO
;
6112 flags
= SECTION_WRITE
;
6116 flags
= SECTION_WRITE
;
6117 if (strcmp (name
, ".data.rel.ro") == 0
6118 || strcmp (name
, ".data.rel.ro.local") == 0)
6119 flags
|= SECTION_RELRO
;
6122 if (decl
&& DECL_P (decl
) && DECL_COMDAT_GROUP (decl
))
6123 flags
|= SECTION_LINKONCE
;
6125 if (strcmp (name
, ".vtable_map_vars") == 0)
6126 flags
|= SECTION_LINKONCE
;
6128 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6129 flags
|= SECTION_TLS
| SECTION_WRITE
;
6131 if (strcmp (name
, ".bss") == 0
6132 || strncmp (name
, ".bss.", 5) == 0
6133 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6134 || strcmp (name
, ".persistent.bss") == 0
6135 || strcmp (name
, ".sbss") == 0
6136 || strncmp (name
, ".sbss.", 6) == 0
6137 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6138 flags
|= SECTION_BSS
;
6140 if (strcmp (name
, ".tdata") == 0
6141 || strncmp (name
, ".tdata.", 7) == 0
6142 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6143 flags
|= SECTION_TLS
;
6145 if (strcmp (name
, ".tbss") == 0
6146 || strncmp (name
, ".tbss.", 6) == 0
6147 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6148 flags
|= SECTION_TLS
| SECTION_BSS
;
6150 /* These three sections have special ELF types. They are neither
6151 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6152 want to print a section type (@progbits or @nobits). If someone
6153 is silly enough to emit code or TLS variables to one of these
6154 sections, then don't handle them specially. */
6155 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6156 && (strcmp (name
, ".init_array") == 0
6157 || strcmp (name
, ".fini_array") == 0
6158 || strcmp (name
, ".preinit_array") == 0))
6159 flags
|= SECTION_NOTYPE
;
6164 /* Return true if the target supports some form of global BSS,
6165 either through bss_noswitch_section, or by selecting a BSS
6166 section in TARGET_ASM_SELECT_SECTION. */
6169 have_global_bss_p (void)
6171 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6174 /* Output assembly to switch to section NAME with attribute FLAGS.
6175 Four variants for common object file formats. */
6178 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6179 unsigned int flags ATTRIBUTE_UNUSED
,
6180 tree decl ATTRIBUTE_UNUSED
)
6182 /* Some object formats don't support named sections at all. The
6183 front-end should already have flagged this as an error. */
6187 #ifndef TLS_SECTION_ASM_FLAG
6188 #define TLS_SECTION_ASM_FLAG 'T'
6192 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6193 tree decl ATTRIBUTE_UNUSED
)
6195 char flagchars
[10], *f
= flagchars
;
6197 /* If we have already declared this section, we can use an
6198 abbreviated form to switch back to it -- unless this section is
6199 part of a COMDAT groups, in which case GAS requires the full
6200 declaration every time. */
6201 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6202 && (flags
& SECTION_DECLARED
))
6204 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6208 if (!(flags
& SECTION_DEBUG
))
6210 #if defined (HAVE_GAS_SECTION_EXCLUDE) && HAVE_GAS_SECTION_EXCLUDE == 1
6211 if (flags
& SECTION_EXCLUDE
)
6214 if (flags
& SECTION_WRITE
)
6216 if (flags
& SECTION_CODE
)
6218 if (flags
& SECTION_SMALL
)
6220 if (flags
& SECTION_MERGE
)
6222 if (flags
& SECTION_STRINGS
)
6224 if (flags
& SECTION_TLS
)
6225 *f
++ = TLS_SECTION_ASM_FLAG
;
6226 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6230 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6232 if (!(flags
& SECTION_NOTYPE
))
6237 if (flags
& SECTION_BSS
)
6243 /* On platforms that use "@" as the assembly comment character,
6245 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6247 fprintf (asm_out_file
, format
, type
);
6249 if (flags
& SECTION_ENTSIZE
)
6250 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6251 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6253 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6254 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6256 fprintf (asm_out_file
, ",%s,comdat",
6257 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6261 putc ('\n', asm_out_file
);
6265 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6266 tree decl ATTRIBUTE_UNUSED
)
6268 char flagchars
[8], *f
= flagchars
;
6270 if (flags
& SECTION_WRITE
)
6272 if (flags
& SECTION_CODE
)
6276 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6280 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6283 default_coff_asm_named_section (name
, flags
, decl
);
6285 if (flags
& SECTION_LINKONCE
)
6287 /* Functions may have been compiled at various levels of
6288 optimization so we can't use `same_size' here.
6289 Instead, have the linker pick one. */
6290 fprintf (asm_out_file
, "\t.linkonce %s\n",
6291 (flags
& SECTION_CODE
? "discard" : "same_size"));
6295 /* The lame default section selector. */
6298 default_select_section (tree decl
, int reloc
,
6299 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6303 if (decl_readonly_section (decl
, reloc
))
6304 return readonly_data_section
;
6306 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6308 if (! ((flag_pic
&& reloc
)
6309 || !TREE_READONLY (decl
)
6310 || TREE_SIDE_EFFECTS (decl
)
6311 || !TREE_CONSTANT (decl
)))
6312 return readonly_data_section
;
6314 else if (TREE_CODE (decl
) == STRING_CST
)
6315 return readonly_data_section
;
6316 else if (! (flag_pic
&& reloc
))
6317 return readonly_data_section
;
6319 return data_section
;
6322 enum section_category
6323 categorize_decl_for_section (const_tree decl
, int reloc
)
6325 enum section_category ret
;
6327 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6329 else if (TREE_CODE (decl
) == STRING_CST
)
6331 if ((flag_sanitize
& SANITIZE_ADDRESS
)
6332 && asan_protect_global (CONST_CAST_TREE (decl
)))
6333 /* or !flag_merge_constants */
6334 return SECCAT_RODATA
;
6336 return SECCAT_RODATA_MERGE_STR
;
6338 else if (TREE_CODE (decl
) == VAR_DECL
)
6340 if (bss_initializer_p (decl
))
6342 else if (! TREE_READONLY (decl
)
6343 || TREE_SIDE_EFFECTS (decl
)
6344 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6346 /* Here the reloc_rw_mask is not testing whether the section should
6347 be read-only or not, but whether the dynamic link will have to
6348 do something. If so, we wish to segregate the data in order to
6349 minimize cache misses inside the dynamic linker. */
6350 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6351 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6355 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6356 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6357 else if (reloc
|| flag_merge_constants
< 2
6358 || ((flag_sanitize
& SANITIZE_ADDRESS
)
6359 && asan_protect_global (CONST_CAST_TREE (decl
))))
6360 /* C and C++ don't allow different variables to share the same
6361 location. -fmerge-all-constants allows even that (at the
6362 expense of not conforming). */
6363 ret
= SECCAT_RODATA
;
6364 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6365 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6367 ret
= SECCAT_RODATA_MERGE_CONST
;
6369 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6371 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6372 || TREE_SIDE_EFFECTS (decl
)
6373 || ! TREE_CONSTANT (decl
))
6376 ret
= SECCAT_RODATA
;
6379 ret
= SECCAT_RODATA
;
6381 /* There are no read-only thread-local sections. */
6382 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6384 /* Note that this would be *just* SECCAT_BSS, except that there's
6385 no concept of a read-only thread-local-data section. */
6386 if (ret
== SECCAT_BSS
6387 || (flag_zero_initialized_in_bss
6388 && initializer_zerop (DECL_INITIAL (decl
))))
6394 /* If the target uses small data sections, select it. */
6395 else if (targetm
.in_small_data_p (decl
))
6397 if (ret
== SECCAT_BSS
)
6399 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6400 ret
= SECCAT_SRODATA
;
6409 decl_readonly_section_1 (enum section_category category
)
6414 case SECCAT_RODATA_MERGE_STR
:
6415 case SECCAT_RODATA_MERGE_STR_INIT
:
6416 case SECCAT_RODATA_MERGE_CONST
:
6417 case SECCAT_SRODATA
:
6425 decl_readonly_section (const_tree decl
, int reloc
)
6427 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6430 /* Select a section based on the above categorization. */
6433 default_elf_select_section (tree decl
, int reloc
,
6434 unsigned HOST_WIDE_INT align
)
6437 switch (categorize_decl_for_section (decl
, reloc
))
6440 /* We're not supposed to be called on FUNCTION_DECLs. */
6443 return readonly_data_section
;
6444 case SECCAT_RODATA_MERGE_STR
:
6445 return mergeable_string_section (decl
, align
, 0);
6446 case SECCAT_RODATA_MERGE_STR_INIT
:
6447 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6448 case SECCAT_RODATA_MERGE_CONST
:
6449 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6450 case SECCAT_SRODATA
:
6454 return data_section
;
6455 case SECCAT_DATA_REL
:
6456 sname
= ".data.rel";
6458 case SECCAT_DATA_REL_LOCAL
:
6459 sname
= ".data.rel.local";
6461 case SECCAT_DATA_REL_RO
:
6462 sname
= ".data.rel.ro";
6464 case SECCAT_DATA_REL_RO_LOCAL
:
6465 sname
= ".data.rel.ro.local";
6488 return get_named_section (decl
, sname
, reloc
);
6491 /* Construct a unique section name based on the decl name and the
6492 categorization performed above. */
6495 default_unique_section (tree decl
, int reloc
)
6497 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6498 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6499 const char *prefix
, *name
, *linkonce
;
6503 switch (categorize_decl_for_section (decl
, reloc
))
6506 prefix
= one_only
? ".t" : ".text";
6509 case SECCAT_RODATA_MERGE_STR
:
6510 case SECCAT_RODATA_MERGE_STR_INIT
:
6511 case SECCAT_RODATA_MERGE_CONST
:
6512 prefix
= one_only
? ".r" : ".rodata";
6514 case SECCAT_SRODATA
:
6515 prefix
= one_only
? ".s2" : ".sdata2";
6518 prefix
= one_only
? ".d" : ".data";
6520 case SECCAT_DATA_REL
:
6521 prefix
= one_only
? ".d.rel" : ".data.rel";
6523 case SECCAT_DATA_REL_LOCAL
:
6524 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6526 case SECCAT_DATA_REL_RO
:
6527 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6529 case SECCAT_DATA_REL_RO_LOCAL
:
6530 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6533 prefix
= one_only
? ".s" : ".sdata";
6536 prefix
= one_only
? ".b" : ".bss";
6539 prefix
= one_only
? ".sb" : ".sbss";
6542 prefix
= one_only
? ".td" : ".tdata";
6545 prefix
= one_only
? ".tb" : ".tbss";
6551 id
= DECL_ASSEMBLER_NAME (decl
);
6552 ultimate_transparent_alias_target (&id
);
6553 name
= IDENTIFIER_POINTER (id
);
6554 name
= targetm
.strip_name_encoding (name
);
6556 /* If we're using one_only, then there needs to be a .gnu.linkonce
6557 prefix to the section name. */
6558 linkonce
= one_only
? ".gnu.linkonce" : "";
6560 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6562 set_decl_section_name (decl
, string
);
6565 /* Subroutine of compute_reloc_for_rtx for leaf rtxes. */
6568 compute_reloc_for_rtx_1 (const_rtx x
)
6570 switch (GET_CODE (x
))
6573 return SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6581 /* Like compute_reloc_for_constant, except for an RTX. The return value
6582 is a mask for which bit 1 indicates a global relocation, and bit 0
6583 indicates a local relocation. */
6586 compute_reloc_for_rtx (const_rtx x
)
6588 switch (GET_CODE (x
))
6592 return compute_reloc_for_rtx_1 (x
);
6597 subrtx_iterator::array_type array
;
6598 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
6599 reloc
|= compute_reloc_for_rtx_1 (*iter
);
6609 default_select_rtx_section (machine_mode mode ATTRIBUTE_UNUSED
,
6611 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6613 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6614 return data_section
;
6616 return readonly_data_section
;
6620 default_elf_select_rtx_section (machine_mode mode
, rtx x
,
6621 unsigned HOST_WIDE_INT align
)
6623 int reloc
= compute_reloc_for_rtx (x
);
6625 /* ??? Handle small data here somehow. */
6627 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6630 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6632 return get_named_section (NULL
, ".data.rel.ro", 3);
6635 return mergeable_constant_section (mode
, align
, 0);
6638 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6641 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6646 /* Careful not to prod global register variables. */
6649 symbol
= XEXP (rtl
, 0);
6650 if (GET_CODE (symbol
) != SYMBOL_REF
)
6653 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6654 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6655 flags
|= SYMBOL_FLAG_FUNCTION
;
6656 if (targetm
.binds_local_p (decl
))
6657 flags
|= SYMBOL_FLAG_LOCAL
;
6658 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6659 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6660 else if (targetm
.in_small_data_p (decl
))
6661 flags
|= SYMBOL_FLAG_SMALL
;
6662 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6663 being PUBLIC, the thing *must* be defined in this translation unit.
6664 Prevent this buglet from being propagated into rtl code as well. */
6665 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6666 flags
|= SYMBOL_FLAG_EXTERNAL
;
6668 SYMBOL_REF_FLAGS (symbol
) = flags
;
6671 /* By default, we do nothing for encode_section_info, so we need not
6672 do anything but discard the '*' marker. */
6675 default_strip_name_encoding (const char *str
)
6677 return str
+ (*str
== '*');
6680 #ifdef ASM_OUTPUT_DEF
6681 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6682 anchor relative to ".", the current section position. */
6685 default_asm_output_anchor (rtx symbol
)
6689 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6690 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6691 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6695 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6698 default_use_anchors_for_symbol_p (const_rtx symbol
)
6703 /* Don't use anchors for mergeable sections. The linker might move
6704 the objects around. */
6705 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6706 if (sect
->common
.flags
& SECTION_MERGE
)
6709 /* Don't use anchors for small data sections. The small data register
6710 acts as an anchor for such sections. */
6711 if (sect
->common
.flags
& SECTION_SMALL
)
6714 decl
= SYMBOL_REF_DECL (symbol
);
6715 if (decl
&& DECL_P (decl
))
6717 /* Don't use section anchors for decls that might be defined or
6718 usurped by other modules. */
6719 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
6722 /* Don't use section anchors for decls that will be placed in a
6723 small data section. */
6724 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6725 one above. The problem is that we only use SECTION_SMALL for
6726 sections that should be marked as small in the section directive. */
6727 if (targetm
.in_small_data_p (decl
))
6733 /* Return true when RESOLUTION indicate that symbol will be bound to the
6734 definition provided by current .o file. */
6737 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6739 return (resolution
== LDPR_PREVAILING_DEF
6740 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6741 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6744 /* Return true when RESOLUTION indicate that symbol will be bound locally
6745 within current executable or DSO. */
6748 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6750 return (resolution
== LDPR_PREVAILING_DEF
6751 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6752 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6753 || resolution
== LDPR_PREEMPTED_REG
6754 || resolution
== LDPR_PREEMPTED_IR
6755 || resolution
== LDPR_RESOLVED_IR
6756 || resolution
== LDPR_RESOLVED_EXEC
);
6759 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6760 wrt cross-module name binding. */
6763 default_binds_local_p (const_tree exp
)
6765 return default_binds_local_p_1 (exp
, flag_shlib
);
6769 default_binds_local_p_1 (const_tree exp
, int shlib
)
6772 bool resolved_locally
= false;
6773 bool resolved_to_local_def
= false;
6775 /* With resolution file in hands, take look into resolutions.
6776 We can't just return true for resolved_locally symbols,
6777 because dynamic linking might overwrite symbols
6778 in shared libraries. */
6779 if (TREE_CODE (exp
) == VAR_DECL
&& TREE_PUBLIC (exp
)
6780 && (TREE_STATIC (exp
) || DECL_EXTERNAL (exp
)))
6782 varpool_node
*vnode
= varpool_node::get (exp
);
6783 if (vnode
&& (resolution_local_p (vnode
->resolution
) || vnode
->in_other_partition
))
6784 resolved_locally
= true;
6786 && resolution_to_local_definition_p (vnode
->resolution
))
6787 resolved_to_local_def
= true;
6789 else if (TREE_CODE (exp
) == FUNCTION_DECL
&& TREE_PUBLIC (exp
))
6791 struct cgraph_node
*node
= cgraph_node::get (exp
);
6793 && (resolution_local_p (node
->resolution
) || node
->in_other_partition
))
6794 resolved_locally
= true;
6796 && resolution_to_local_definition_p (node
->resolution
))
6797 resolved_to_local_def
= true;
6800 /* A non-decl is an entry in the constant pool. */
6803 /* Weakrefs may not bind locally, even though the weakref itself is always
6804 static and therefore local. Similarly, the resolver for ifunc functions
6805 might resolve to a non-local function.
6806 FIXME: We can resolve the weakref case more curefuly by looking at the
6808 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6809 || (TREE_CODE (exp
) == FUNCTION_DECL
6810 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6812 /* Static variables are always local. */
6813 else if (! TREE_PUBLIC (exp
))
6815 /* A variable is local if the user has said explicitly that it will
6817 else if ((DECL_VISIBILITY_SPECIFIED (exp
)
6818 || resolved_to_local_def
)
6819 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6821 /* Variables defined outside this object might not be local. */
6822 else if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6824 /* If defined in this object and visibility is not default, must be
6826 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6828 /* Default visibility weak data can be overridden by a strong symbol
6829 in another module and so are not local. */
6830 else if (DECL_WEAK (exp
)
6831 && !resolved_locally
)
6833 /* If PIC, then assume that any global name can be overridden by
6834 symbols resolved from other modules. */
6837 /* Uninitialized COMMON variable may be unified with symbols
6838 resolved from other modules. */
6839 else if (DECL_COMMON (exp
)
6840 && !resolved_locally
6841 && (DECL_INITIAL (exp
) == NULL
6842 || (!in_lto_p
&& DECL_INITIAL (exp
) == error_mark_node
)))
6844 /* Otherwise we're left with initialized (or non-common) global data
6845 which is of necessity defined locally. */
6852 /* Return true when references to DECL must bind to current definition in
6855 The condition is usually equivalent to whether the function binds to the
6856 current module (shared library or executable), that is to binds_local_p.
6857 We use this fact to avoid need for another target hook and implement
6858 the logic using binds_local_p and just special cases where
6859 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6860 the weak definitions (that can be overwritten at linktime by other
6861 definition from different object file) and when resolution info is available
6862 we simply use the knowledge passed to us by linker plugin. */
6864 decl_binds_to_current_def_p (const_tree decl
)
6866 gcc_assert (DECL_P (decl
));
6867 if (!targetm
.binds_local_p (decl
))
6869 if (!TREE_PUBLIC (decl
))
6871 /* When resolution is available, just use it. */
6872 if (TREE_CODE (decl
) == VAR_DECL
6873 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)))
6875 varpool_node
*vnode
= varpool_node::get (decl
);
6877 && vnode
->resolution
!= LDPR_UNKNOWN
)
6878 return resolution_to_local_definition_p (vnode
->resolution
);
6880 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
6882 struct cgraph_node
*node
= cgraph_node::get (decl
);
6884 && node
->resolution
!= LDPR_UNKNOWN
)
6885 return resolution_to_local_definition_p (node
->resolution
);
6887 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6888 binds locally but still can be overwritten), DECL_COMMON (can be merged
6889 with a non-common definition somewhere in the same module) or
6891 This rely on fact that binds_local_p behave as decl_replaceable_p
6892 for all other declaration types. */
6893 if (DECL_WEAK (decl
))
6895 if (DECL_COMMON (decl
)
6896 && (DECL_INITIAL (decl
) == NULL
6897 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6899 if (DECL_EXTERNAL (decl
))
6904 /* A replaceable function or variable is one which may be replaced
6905 at link-time with an entirely different definition, provided that the
6906 replacement has the same type. For example, functions declared
6907 with __attribute__((weak)) on most systems are replaceable.
6909 COMDAT functions are not replaceable, since all definitions of the
6910 function must be equivalent. It is important that COMDAT functions
6911 not be treated as replaceable so that use of C++ template
6912 instantiations is not penalized. */
6915 decl_replaceable_p (tree decl
)
6917 gcc_assert (DECL_P (decl
));
6918 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
6920 if (!flag_semantic_interposition
6921 && !DECL_WEAK (decl
))
6923 return !decl_binds_to_current_def_p (decl
);
6926 /* Default function to output code that will globalize a label. A
6927 target must define GLOBAL_ASM_OP or provide its own function to
6928 globalize a label. */
6929 #ifdef GLOBAL_ASM_OP
6931 default_globalize_label (FILE * stream
, const char *name
)
6933 fputs (GLOBAL_ASM_OP
, stream
);
6934 assemble_name (stream
, name
);
6935 putc ('\n', stream
);
6937 #endif /* GLOBAL_ASM_OP */
6939 /* Default function to output code that will globalize a declaration. */
6941 default_globalize_decl_name (FILE * stream
, tree decl
)
6943 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6944 targetm
.asm_out
.globalize_label (stream
, name
);
6947 /* Default function to output a label for unwind information. The
6948 default is to do nothing. A target that needs nonlocal labels for
6949 unwind information must provide its own function to do this. */
6951 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6952 tree decl ATTRIBUTE_UNUSED
,
6953 int for_eh ATTRIBUTE_UNUSED
,
6954 int empty ATTRIBUTE_UNUSED
)
6958 /* Default function to output a label to divide up the exception table.
6959 The default is to do nothing. A target that needs/wants to divide
6960 up the table must provide it's own function to do this. */
6962 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
6966 /* This is how to output an internal numbered label where PREFIX is
6967 the class of label and LABELNO is the number within the class. */
6970 default_generate_internal_label (char *buf
, const char *prefix
,
6971 unsigned long labelno
)
6973 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6976 /* This is how to output an internal numbered label where PREFIX is
6977 the class of label and LABELNO is the number within the class. */
6980 default_internal_label (FILE *stream
, const char *prefix
,
6981 unsigned long labelno
)
6983 char *const buf
= (char *) alloca (40 + strlen (prefix
));
6984 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6985 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
6989 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
6992 default_asm_declare_constant_name (FILE *file
, const char *name
,
6993 const_tree exp ATTRIBUTE_UNUSED
,
6994 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
6996 assemble_label (file
, name
);
6999 /* This is the default behavior at the beginning of a file. It's
7000 controlled by two other target-hook toggles. */
7002 default_file_start (void)
7004 if (targetm
.asm_file_start_app_off
7005 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
7006 fputs (ASM_APP_OFF
, asm_out_file
);
7008 if (targetm
.asm_file_start_file_directive
)
7009 output_file_directive (asm_out_file
, main_input_filename
);
7012 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
7013 which emits a special section directive used to indicate whether or
7014 not this object file needs an executable stack. This is primarily
7015 a GNU extension to ELF but could be used on other targets. */
7017 int trampolines_created
;
7020 file_end_indicate_exec_stack (void)
7022 unsigned int flags
= SECTION_DEBUG
;
7023 if (trampolines_created
)
7024 flags
|= SECTION_CODE
;
7026 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
7029 /* Emit a special section directive to indicate that this object file
7030 was compiled with -fsplit-stack. This is used to let the linker
7031 detect calls between split-stack code and non-split-stack code, so
7032 that it can modify the split-stack code to allocate a sufficiently
7033 large stack. We emit another special section if there are any
7034 functions in this file which have the no_split_stack attribute, to
7035 prevent the linker from warning about being unable to convert the
7036 functions if they call non-split-stack code. */
7039 file_end_indicate_split_stack (void)
7041 if (flag_split_stack
)
7043 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
7045 if (saw_no_split_stack
)
7046 switch_to_section (get_section (".note.GNU-no-split-stack",
7047 SECTION_DEBUG
, NULL
));
7051 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
7052 a get_unnamed_section callback. */
7055 output_section_asm_op (const void *directive
)
7057 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
7060 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
7061 the current section is NEW_SECTION. */
7064 switch_to_section (section
*new_section
)
7066 if (in_section
== new_section
)
7069 if (new_section
->common
.flags
& SECTION_FORGET
)
7072 in_section
= new_section
;
7074 switch (SECTION_STYLE (new_section
))
7077 targetm
.asm_out
.named_section (new_section
->named
.name
,
7078 new_section
->named
.common
.flags
,
7079 new_section
->named
.decl
);
7082 case SECTION_UNNAMED
:
7083 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
7086 case SECTION_NOSWITCH
:
7091 new_section
->common
.flags
|= SECTION_DECLARED
;
7094 /* If block symbol SYMBOL has not yet been assigned an offset, place
7095 it at the end of its block. */
7098 place_block_symbol (rtx symbol
)
7100 unsigned HOST_WIDE_INT size
, mask
, offset
;
7101 struct constant_descriptor_rtx
*desc
;
7102 unsigned int alignment
;
7103 struct object_block
*block
;
7106 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7107 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7110 /* Work out the symbol's size and alignment. */
7111 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7113 desc
= SYMBOL_REF_CONSTANT (symbol
);
7114 alignment
= desc
->align
;
7115 size
= GET_MODE_SIZE (desc
->mode
);
7117 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7119 decl
= SYMBOL_REF_DECL (symbol
);
7120 alignment
= DECL_ALIGN (decl
);
7121 size
= get_constant_size (DECL_INITIAL (decl
));
7122 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7123 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7124 && asan_protect_global (DECL_INITIAL (decl
)))
7125 size
+= asan_red_zone_size (size
);
7129 struct symtab_node
*snode
;
7130 decl
= SYMBOL_REF_DECL (symbol
);
7132 snode
= symtab_node::get (decl
);
7135 rtx target
= DECL_RTL (snode
->ultimate_alias_target ()->decl
);
7137 place_block_symbol (target
);
7138 SYMBOL_REF_BLOCK_OFFSET (symbol
) = SYMBOL_REF_BLOCK_OFFSET (target
);
7141 alignment
= get_variable_align (decl
);
7142 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7143 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7144 && asan_protect_global (decl
))
7146 size
+= asan_red_zone_size (size
);
7147 alignment
= MAX (alignment
,
7148 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7152 /* Calculate the object's offset from the start of the block. */
7153 block
= SYMBOL_REF_BLOCK (symbol
);
7154 mask
= alignment
/ BITS_PER_UNIT
- 1;
7155 offset
= (block
->size
+ mask
) & ~mask
;
7156 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7158 /* Record the block's new alignment and size. */
7159 block
->alignment
= MAX (block
->alignment
, alignment
);
7160 block
->size
= offset
+ size
;
7162 vec_safe_push (block
->objects
, symbol
);
7165 /* Return the anchor that should be used to address byte offset OFFSET
7166 from the first object in BLOCK. MODEL is the TLS model used
7170 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7171 enum tls_model model
)
7174 unsigned int begin
, middle
, end
;
7175 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7178 /* Work out the anchor's offset. Use an offset of 0 for the first
7179 anchor so that we don't pessimize the case where we take the address
7180 of a variable at the beginning of the block. This is particularly
7181 useful when a block has only one variable assigned to it.
7183 We try to place anchors RANGE bytes apart, so there can then be
7184 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7185 a ptr_mode offset. With some target settings, the lowest such
7186 anchor might be out of range for the lowest ptr_mode offset;
7187 likewise the highest anchor for the highest offset. Use anchors
7188 at the extreme ends of the ptr_mode range in such cases.
7190 All arithmetic uses unsigned integers in order to avoid
7192 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7193 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7194 range
= max_offset
- min_offset
+ 1;
7199 bias
= HOST_WIDE_INT_1U
<< (GET_MODE_BITSIZE (ptr_mode
) - 1);
7202 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7203 delta
-= delta
% range
;
7206 offset
= (HOST_WIDE_INT
) (-delta
);
7210 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7211 delta
-= delta
% range
;
7212 if (delta
> bias
- 1)
7214 offset
= (HOST_WIDE_INT
) delta
;
7218 /* Do a binary search to see if there's already an anchor we can use.
7219 Set BEGIN to the new anchor's index if not. */
7221 end
= vec_safe_length (block
->anchors
);
7222 while (begin
!= end
)
7224 middle
= (end
+ begin
) / 2;
7225 anchor
= (*block
->anchors
)[middle
];
7226 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7228 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7230 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7232 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7238 /* Create a new anchor with a unique label. */
7239 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7240 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7241 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7242 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7244 /* Insert it at index BEGIN. */
7245 vec_safe_insert (block
->anchors
, begin
, anchor
);
7249 /* Output the objects in BLOCK. */
7252 output_object_block (struct object_block
*block
)
7254 struct constant_descriptor_rtx
*desc
;
7256 HOST_WIDE_INT offset
;
7260 if (!block
->objects
)
7263 /* Switch to the section and make sure that the first byte is
7264 suitably aligned. */
7265 switch_to_section (block
->sect
);
7266 assemble_align (block
->alignment
);
7268 /* Define the values of all anchors relative to the current section
7270 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7271 targetm
.asm_out
.output_anchor (symbol
);
7273 /* Output the objects themselves. */
7275 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7277 /* Move to the object's offset, padding with zeros if necessary. */
7278 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7279 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7280 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7282 desc
= SYMBOL_REF_CONSTANT (symbol
);
7283 output_constant_pool_1 (desc
, 1);
7284 offset
+= GET_MODE_SIZE (desc
->mode
);
7286 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7289 decl
= SYMBOL_REF_DECL (symbol
);
7290 assemble_constant_contents (DECL_INITIAL (decl
), XSTR (symbol
, 0),
7292 size
= get_constant_size (DECL_INITIAL (decl
));
7294 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7295 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7296 && asan_protect_global (DECL_INITIAL (decl
)))
7298 size
= asan_red_zone_size (size
);
7299 assemble_zeros (size
);
7306 decl
= SYMBOL_REF_DECL (symbol
);
7307 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7308 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7310 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7311 && asan_protect_global (decl
))
7313 size
= asan_red_zone_size (size
);
7314 assemble_zeros (size
);
7321 /* A htab_traverse callback used to call output_object_block for
7322 each member of object_block_htab. */
7325 output_object_block_htab (object_block
**slot
, void *)
7327 output_object_block (*slot
);
7331 /* Output the definitions of all object_blocks. */
7334 output_object_blocks (void)
7336 object_block_htab
->traverse
<void *, output_object_block_htab
> (NULL
);
7339 /* This function provides a possible implementation of the
7340 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7341 by -frecord-gcc-switches it creates a new mergeable, string section in the
7342 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7343 contains the switches in ASCII format.
7345 FIXME: This code does not correctly handle double quote characters
7346 that appear inside strings, (it strips them rather than preserving them).
7347 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7348 characters - instead it treats them as sub-string separators. Since
7349 we want to emit NUL strings terminators into the object file we have to use
7353 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7357 case SWITCH_TYPE_PASSED
:
7358 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7359 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7362 case SWITCH_TYPE_DESCRIPTIVE
:
7365 /* Distinguish between invocations where name is NULL. */
7366 static bool started
= false;
7372 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7376 | (SECTION_ENTSIZE
& 1),
7378 switch_to_section (sec
);
7387 /* The return value is currently ignored by the caller, but must be 0.
7388 For -fverbose-asm the return value would be the number of characters
7389 emitted into the assembler file. */
7393 /* Emit text to declare externally defined symbols. It is needed to
7394 properly support non-default visibility. */
7396 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7398 const char *name ATTRIBUTE_UNUSED
)
7400 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7401 set in order to avoid putting out names that are never really
7403 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7404 && targetm
.binds_local_p (decl
))
7405 maybe_assemble_visibility (decl
);
7408 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7411 default_asm_output_source_filename (FILE *file
, const char *name
)
7413 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7414 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7416 fprintf (file
, "\t.file\t");
7417 output_quoted_string (file
, name
);
7422 /* Output a file name in the form wanted by System V. */
7425 output_file_directive (FILE *asm_file
, const char *input_name
)
7430 if (input_name
== NULL
)
7431 input_name
= "<stdin>";
7433 input_name
= remap_debug_filename (input_name
);
7435 len
= strlen (input_name
);
7436 na
= input_name
+ len
;
7438 /* NA gets INPUT_NAME sans directory names. */
7439 while (na
> input_name
)
7441 if (IS_DIR_SEPARATOR (na
[-1]))
7446 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7449 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7452 make_debug_expr_from_rtl (const_rtx exp
)
7454 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7455 machine_mode mode
= GET_MODE (exp
);
7458 DECL_ARTIFICIAL (ddecl
) = 1;
7459 if (REG_P (exp
) && REG_EXPR (exp
))
7460 type
= TREE_TYPE (REG_EXPR (exp
));
7461 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7462 type
= TREE_TYPE (MEM_EXPR (exp
));
7465 if (type
&& TYPE_MODE (type
) == mode
)
7466 TREE_TYPE (ddecl
) = type
;
7468 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7469 DECL_MODE (ddecl
) = mode
;
7470 dval
= gen_rtx_DEBUG_EXPR (mode
);
7471 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7472 SET_DECL_RTL (ddecl
, dval
);
7476 #ifdef ELF_ASCII_ESCAPES
7477 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7480 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7485 fputs (STRING_ASM_OP
, f
);
7490 escape
= ELF_ASCII_ESCAPES
[c
];
7497 /* TODO: Print in hex with fast function, important for -flto. */
7498 fprintf (f
, "\\%03o", c
);
7511 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7514 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7516 const char *limit
= s
+ len
;
7517 const char *last_null
= NULL
;
7518 unsigned bytes_in_chunk
= 0;
7522 for (; s
< limit
; s
++)
7526 if (bytes_in_chunk
>= 60)
7535 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7542 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7544 if (bytes_in_chunk
> 0)
7551 default_elf_asm_output_limited_string (f
, s
);
7556 if (bytes_in_chunk
== 0)
7557 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7560 escape
= ELF_ASCII_ESCAPES
[c
];
7568 /* TODO: Print in hex with fast function, important for -flto. */
7569 fprintf (f
, "\\%03o", c
);
7570 bytes_in_chunk
+= 4;
7575 bytes_in_chunk
+= 2;
7582 if (bytes_in_chunk
> 0)
7590 static GTY(()) section
*elf_init_array_section
;
7591 static GTY(()) section
*elf_fini_array_section
;
7594 get_elf_initfini_array_priority_section (int priority
,
7598 if (priority
!= DEFAULT_INIT_PRIORITY
)
7601 sprintf (buf
, "%s.%.5u",
7602 constructor_p
? ".init_array" : ".fini_array",
7604 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7610 if (elf_init_array_section
== NULL
)
7611 elf_init_array_section
7612 = get_section (".init_array",
7613 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7614 sec
= elf_init_array_section
;
7618 if (elf_fini_array_section
== NULL
)
7619 elf_fini_array_section
7620 = get_section (".fini_array",
7621 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7622 sec
= elf_fini_array_section
;
7628 /* Use .init_array section for constructors. */
7631 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7633 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7635 assemble_addr_to_section (symbol
, sec
);
7638 /* Use .fini_array section for destructors. */
7641 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7643 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7645 assemble_addr_to_section (symbol
, sec
);
7648 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7650 This is a bit of a cheat. The real default is a no-op, but this
7651 hook is the default for all targets with a .ident directive. */
7654 default_asm_output_ident_directive (const char *ident_str
)
7656 const char *ident_asm_op
= "\t.ident\t";
7658 /* If we are still in the front end, do not write out the string
7659 to asm_out_file. Instead, add a fake top-level asm statement.
7660 This allows the front ends to use this hook without actually
7661 writing to asm_out_file, to handle #ident or Pragma Ident. */
7662 if (symtab
->state
== PARSING
)
7664 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7665 symtab
->finalize_toplevel_asm (build_string (strlen (buf
), buf
));
7668 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7671 #include "gt-varasm.h"