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"
36 #include "double-int.h"
43 #include "fold-const.h"
44 #include "stor-layout.h"
45 #include "stringpool.h"
48 #include "hard-reg-set.h"
51 #include "statistics.h"
53 #include "fixed-value.h"
54 #include "insn-config.h"
64 #include "diagnostic-core.h"
66 #include "langhooks.h"
70 #include "common/common-target.h"
71 #include "targhooks.h"
73 #include "dominance.h"
75 #include "basic-block.h"
78 #include "plugin-api.h"
83 #include "tree-chkp.h"
85 #ifdef XCOFF_DEBUGGING_INFO
86 #include "xcoffout.h" /* Needed for external data
87 declarations for e.g. AIX 4.x. */
90 /* The (assembler) name of the first globally-visible object output. */
91 extern GTY(()) const char *first_global_object_name
;
92 extern GTY(()) const char *weak_global_object_name
;
94 const char *first_global_object_name
;
95 const char *weak_global_object_name
;
98 struct constant_descriptor_rtx
;
99 struct rtx_constant_pool
;
101 #define n_deferred_constants (crtl->varasm.deferred_constants)
103 /* Number for making the label on the next
104 constant that is stored in memory. */
106 static GTY(()) int const_labelno
;
108 /* Carry information from ASM_DECLARE_OBJECT_NAME
109 to ASM_FINISH_DECLARE_OBJECT. */
111 int size_directive_output
;
113 /* The last decl for which assemble_variable was called,
114 if it did ASM_DECLARE_OBJECT_NAME.
115 If the last call to assemble_variable didn't do that,
118 tree last_assemble_variable_decl
;
120 /* The following global variable indicates if the first basic block
121 in a function belongs to the cold partition or not. */
123 bool first_function_block_is_cold
;
125 /* Whether we saw any functions with no_split_stack. */
127 static bool saw_no_split_stack
;
129 static const char *strip_reg_name (const char *);
130 static int contains_pointers_p (tree
);
131 #ifdef ASM_OUTPUT_EXTERNAL
132 static bool incorporeal_function_p (tree
);
134 static void decode_addr_const (tree
, struct addr_const
*);
135 static hashval_t
const_hash_1 (const tree
);
136 static int compare_constant (const tree
, const tree
);
137 static void output_constant_def_contents (rtx
);
138 static void output_addressed_constants (tree
);
139 static unsigned HOST_WIDE_INT
output_constant (tree
, unsigned HOST_WIDE_INT
,
141 static void globalize_decl (tree
);
142 static bool decl_readonly_section_1 (enum section_category
);
143 #ifdef BSS_SECTION_ASM_OP
144 #ifdef ASM_OUTPUT_ALIGNED_BSS
145 static void asm_output_aligned_bss (FILE *, tree
, const char *,
146 unsigned HOST_WIDE_INT
, int)
149 #endif /* BSS_SECTION_ASM_OP */
150 static void mark_weak (tree
);
151 static void output_constant_pool (const char *, tree
);
153 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
154 section
*text_section
;
155 section
*data_section
;
156 section
*readonly_data_section
;
157 section
*sdata_section
;
158 section
*ctors_section
;
159 section
*dtors_section
;
160 section
*bss_section
;
161 section
*sbss_section
;
163 /* Various forms of common section. All are guaranteed to be nonnull. */
164 section
*tls_comm_section
;
165 section
*comm_section
;
166 section
*lcomm_section
;
168 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
170 section
*bss_noswitch_section
;
172 /* The section that holds the main exception table, when known. The section
173 is set either by the target's init_sections hook or by the first call to
174 switch_to_exception_section. */
175 section
*exception_section
;
177 /* The section that holds the DWARF2 frame unwind information, when known.
178 The section is set either by the target's init_sections hook or by the
179 first call to switch_to_eh_frame_section. */
180 section
*eh_frame_section
;
182 /* asm_out_file's current section. This is NULL if no section has yet
183 been selected or if we lose track of what the current section is. */
186 /* True if code for the current function is currently being directed
187 at the cold section. */
188 bool in_cold_section_p
;
190 /* The following global holds the "function name" for the code in the
191 cold section of a function, if hot/cold function splitting is enabled
192 and there was actually code that went into the cold section. A
193 pseudo function name is needed for the cold section of code for some
194 debugging tools that perform symbolization. */
195 tree cold_function_name
= NULL_TREE
;
197 /* A linked list of all the unnamed sections. */
198 static GTY(()) section
*unnamed_sections
;
200 /* Return a nonzero value if DECL has a section attribute. */
201 #define IN_NAMED_SECTION(DECL) \
202 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
203 && DECL_SECTION_NAME (DECL) != NULL)
205 struct section_hasher
: ggc_hasher
<section
*>
207 typedef const char *compare_type
;
209 static hashval_t
hash (section
*);
210 static bool equal (section
*, const char *);
213 /* Hash table of named sections. */
214 static GTY(()) hash_table
<section_hasher
> *section_htab
;
216 struct object_block_hasher
: ggc_hasher
<object_block
*>
218 typedef const section
*compare_type
;
220 static hashval_t
hash (object_block
*);
221 static bool equal (object_block
*, const section
*);
224 /* A table of object_blocks, indexed by section. */
225 static GTY(()) hash_table
<object_block_hasher
> *object_block_htab
;
227 /* The next number to use for internal anchor labels. */
228 static GTY(()) int anchor_labelno
;
230 /* A pool of constants that can be shared between functions. */
231 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
233 /* Helper routines for maintaining section_htab. */
236 section_hasher::equal (section
*old
, const char *new_name
)
238 return strcmp (old
->named
.name
, new_name
) == 0;
242 section_hasher::hash (section
*old
)
244 return htab_hash_string (old
->named
.name
);
247 /* Return a hash value for section SECT. */
250 hash_section (section
*sect
)
252 if (sect
->common
.flags
& SECTION_NAMED
)
253 return htab_hash_string (sect
->named
.name
);
254 return sect
->common
.flags
;
257 /* Helper routines for maintaining object_block_htab. */
260 object_block_hasher::equal (object_block
*old
, const section
*new_section
)
262 return old
->sect
== new_section
;
266 object_block_hasher::hash (object_block
*old
)
268 return hash_section (old
->sect
);
271 /* Return a new unnamed section with the given fields. */
274 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
279 sect
= ggc_alloc
<section
> ();
280 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
281 sect
->unnamed
.callback
= callback
;
282 sect
->unnamed
.data
= data
;
283 sect
->unnamed
.next
= unnamed_sections
;
285 unnamed_sections
= sect
;
289 /* Return a SECTION_NOSWITCH section with the given fields. */
292 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
296 sect
= ggc_alloc
<section
> ();
297 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
298 sect
->noswitch
.callback
= callback
;
303 /* Return the named section structure associated with NAME. Create
304 a new section with the given fields if no such structure exists. */
307 get_section (const char *name
, unsigned int flags
, tree decl
)
309 section
*sect
, **slot
;
311 slot
= section_htab
->find_slot_with_hash (name
, htab_hash_string (name
),
313 flags
|= SECTION_NAMED
;
316 sect
= ggc_alloc
<section
> ();
317 sect
->named
.common
.flags
= flags
;
318 sect
->named
.name
= ggc_strdup (name
);
319 sect
->named
.decl
= decl
;
325 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
326 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
328 /* It is fine if one of the section flags is
329 SECTION_WRITE | SECTION_RELRO and the other has none of these
330 flags (i.e. read-only) in named sections and either the
331 section hasn't been declared yet or has been declared as writable.
332 In that case just make sure the resulting flags are
333 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
335 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
336 == (SECTION_WRITE
| SECTION_RELRO
)
337 && (sect
->common
.flags
338 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
339 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
340 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
341 || (sect
->common
.flags
& SECTION_WRITE
)))
343 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
346 /* Sanity check user variables for flag changes. */
347 if (sect
->named
.decl
!= NULL
348 && DECL_P (sect
->named
.decl
)
349 && decl
!= sect
->named
.decl
)
351 if (decl
!= NULL
&& DECL_P (decl
))
352 error ("%+D causes a section type conflict with %D",
353 decl
, sect
->named
.decl
);
355 error ("section type conflict with %D", sect
->named
.decl
);
356 inform (DECL_SOURCE_LOCATION (sect
->named
.decl
),
357 "%qD was declared here", sect
->named
.decl
);
359 else if (decl
!= NULL
&& DECL_P (decl
))
360 error ("%+D causes a section type conflict", decl
);
362 error ("section type conflict");
363 /* Make sure we don't error about one section multiple times. */
364 sect
->common
.flags
|= SECTION_OVERRIDE
;
370 /* Return true if the current compilation mode benefits from having
371 objects grouped into blocks. */
374 use_object_blocks_p (void)
376 return flag_section_anchors
;
379 /* Return the object_block structure for section SECT. Create a new
380 structure if we haven't created one already. Return null if SECT
383 static struct object_block
*
384 get_block_for_section (section
*sect
)
386 struct object_block
*block
;
392 = object_block_htab
->find_slot_with_hash (sect
, hash_section (sect
),
397 block
= ggc_cleared_alloc
<object_block
> ();
404 /* Create a symbol with label LABEL and place it at byte offset
405 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
406 is not yet known. LABEL must be a garbage-collected string. */
409 create_block_symbol (const char *label
, struct object_block
*block
,
410 HOST_WIDE_INT offset
)
415 /* Create the extended SYMBOL_REF. */
416 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
417 symbol
= (rtx
) ggc_internal_alloc (size
);
419 /* Initialize the normal SYMBOL_REF fields. */
420 memset (symbol
, 0, size
);
421 PUT_CODE (symbol
, SYMBOL_REF
);
422 PUT_MODE (symbol
, Pmode
);
423 XSTR (symbol
, 0) = label
;
424 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
426 /* Initialize the block_symbol stuff. */
427 SYMBOL_REF_BLOCK (symbol
) = block
;
428 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
433 /* Return a section with a particular name and with whatever SECTION_*
434 flags section_type_flags deems appropriate. The name of the section
435 is taken from NAME if nonnull, otherwise it is taken from DECL's
436 DECL_SECTION_NAME. DECL is the decl associated with the section
437 (see the section comment for details) and RELOC is as for
438 section_type_flags. */
441 get_named_section (tree decl
, const char *name
, int reloc
)
447 gcc_assert (decl
&& DECL_P (decl
) && DECL_SECTION_NAME (decl
));
448 name
= DECL_SECTION_NAME (decl
);
451 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
452 return get_section (name
, flags
, decl
);
455 /* Worker for resolve_unique_section. */
458 set_implicit_section (struct symtab_node
*n
, void *data ATTRIBUTE_UNUSED
)
460 n
->implicit_section
= true;
464 /* If required, set DECL_SECTION_NAME to a unique name. */
467 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
468 int flag_function_or_data_sections
)
470 if (DECL_SECTION_NAME (decl
) == NULL
471 && targetm_common
.have_named_sections
472 && (flag_function_or_data_sections
473 || DECL_COMDAT_GROUP (decl
)))
475 targetm
.asm_out
.unique_section (decl
, reloc
);
476 if (DECL_SECTION_NAME (decl
))
477 symtab_node::get (decl
)->call_for_symbol_and_aliases
478 (set_implicit_section
, NULL
, true);
482 #ifdef BSS_SECTION_ASM_OP
484 #ifdef ASM_OUTPUT_ALIGNED_BSS
486 /* Utility function for targets to use in implementing
487 ASM_OUTPUT_ALIGNED_BSS.
488 ??? It is believed that this function will work in most cases so such
489 support is localized here. */
492 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
493 const char *name
, unsigned HOST_WIDE_INT size
,
496 switch_to_section (bss_section
);
497 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
498 #ifdef ASM_DECLARE_OBJECT_NAME
499 last_assemble_variable_decl
= decl
;
500 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
502 /* Standard thing is just output label for the object. */
503 ASM_OUTPUT_LABEL (file
, name
);
504 #endif /* ASM_DECLARE_OBJECT_NAME */
505 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
510 #endif /* BSS_SECTION_ASM_OP */
512 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
513 /* Return the hot section for function DECL. Return text_section for
517 hot_function_section (tree decl
)
519 if (decl
!= NULL_TREE
520 && DECL_SECTION_NAME (decl
) != NULL
521 && targetm_common
.have_named_sections
)
522 return get_named_section (decl
, NULL
, 0);
528 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
531 When DECL_SECTION_NAME is non-NULL and it is implicit section and
532 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
533 concatenate the name with NAMED_SECTION_SUFFIX.
534 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
537 get_named_text_section (tree decl
,
538 const char *text_section_name
,
539 const char *named_section_suffix
)
541 if (decl
&& DECL_SECTION_NAME (decl
))
543 if (named_section_suffix
)
545 const char *dsn
= DECL_SECTION_NAME (decl
);
546 const char *stripped_name
;
549 name
= (char *) alloca (strlen (dsn
) + 1);
553 stripped_name
= targetm
.strip_name_encoding (name
);
555 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
556 return get_named_section (decl
, buffer
, 0);
558 else if (symtab_node::get (decl
)->implicit_section
)
562 /* Do not try to split gnu_linkonce functions. This gets somewhat
564 if (DECL_COMDAT_GROUP (decl
) && !HAVE_COMDAT_GROUP
)
566 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
567 name
= targetm
.strip_name_encoding (name
);
568 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
574 return get_named_section (decl
, text_section_name
, 0);
577 /* Choose named function section based on its frequency. */
580 default_function_section (tree decl
, enum node_frequency freq
,
581 bool startup
, bool exit
)
583 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
584 /* Old GNU linkers have buggy --gc-section support, which sometimes
585 results in .gcc_except_table* sections being garbage collected. */
587 && symtab_node::get (decl
)->implicit_section
)
591 if (!flag_reorder_functions
592 || !targetm_common
.have_named_sections
)
594 /* Startup code should go to startup subsection unless it is
595 unlikely executed (this happens especially with function splitting
596 where we can split away unnecessary parts of static constructors. */
597 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
599 /* If we do have a profile or(and) LTO phase is executed, we do not need
600 these ELF section. */
601 if (!in_lto_p
|| !flag_profile_values
)
602 return get_named_text_section (decl
, ".text.startup", NULL
);
607 /* Similarly for exit. */
608 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
609 return get_named_text_section (decl
, ".text.exit", NULL
);
611 /* Group cold functions together, similarly for hot code. */
614 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
615 return get_named_text_section (decl
, ".text.unlikely", NULL
);
616 case NODE_FREQUENCY_HOT
:
617 /* If we do have a profile or(and) LTO phase is executed, we do not need
618 these ELF section. */
619 if (!in_lto_p
|| !flag_profile_values
)
620 return get_named_text_section (decl
, ".text.hot", NULL
);
626 /* Return the section for function DECL.
628 If DECL is NULL_TREE, return the text section. We can be passed
629 NULL_TREE under some circumstances by dbxout.c at least.
631 If FORCE_COLD is true, return cold function section ignoring
632 the frequency info of cgraph_node. */
635 function_section_1 (tree decl
, bool force_cold
)
637 section
*section
= NULL
;
638 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
639 bool startup
= false, exit
= false;
643 struct cgraph_node
*node
= cgraph_node::get (decl
);
647 freq
= node
->frequency
;
648 startup
= node
->only_called_at_startup
;
649 exit
= node
->only_called_at_exit
;
653 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
655 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
656 if (decl
!= NULL_TREE
657 && DECL_SECTION_NAME (decl
) != NULL
)
659 if (targetm
.asm_out
.function_section
)
660 section
= targetm
.asm_out
.function_section (decl
, freq
,
664 return get_named_section (decl
, NULL
, 0);
667 return targetm
.asm_out
.select_section
668 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
669 symtab_node::get (decl
)->definition_alignment ());
671 if (targetm
.asm_out
.function_section
)
672 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
675 return hot_function_section (decl
);
679 /* Return the section for function DECL.
681 If DECL is NULL_TREE, return the text section. We can be passed
682 NULL_TREE under some circumstances by dbxout.c at least. */
685 function_section (tree decl
)
687 /* Handle cases where function splitting code decides
688 to put function entry point into unlikely executed section
689 despite the fact that the function itself is not cold
690 (i.e. it is called rarely but contains a hot loop that is
691 better to live in hot subsection for the code locality). */
692 return function_section_1 (decl
,
693 first_function_block_is_cold
);
696 /* Return the section for the current function, take IN_COLD_SECTION_P
700 current_function_section (void)
702 return function_section_1 (current_function_decl
, in_cold_section_p
);
705 /* Tell assembler to switch to unlikely-to-be-executed text section. */
708 unlikely_text_section (void)
710 return function_section_1 (current_function_decl
, true);
713 /* When called within a function context, return true if the function
714 has been assigned a cold text section and if SECT is that section.
715 When called outside a function context, return true if SECT is the
716 default cold section. */
719 unlikely_text_section_p (section
*sect
)
721 return sect
== function_section_1 (current_function_decl
, true);
724 /* Return the read-only data section associated with function DECL. */
727 default_function_rodata_section (tree decl
)
729 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
731 const char *name
= DECL_SECTION_NAME (decl
);
733 if (DECL_COMDAT_GROUP (decl
) && HAVE_COMDAT_GROUP
)
739 dot
= strchr (name
+ 1, '.');
742 len
= strlen (dot
) + 8;
743 rname
= (char *) alloca (len
);
745 strcpy (rname
, ".rodata");
747 return get_section (rname
, SECTION_LINKONCE
, decl
);
749 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
750 else if (DECL_COMDAT_GROUP (decl
)
751 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
753 size_t len
= strlen (name
) + 1;
754 char *rname
= (char *) alloca (len
);
756 memcpy (rname
, name
, len
);
758 return get_section (rname
, SECTION_LINKONCE
, decl
);
760 /* For .text.foo we want to use .rodata.foo. */
761 else if (flag_function_sections
&& flag_data_sections
762 && strncmp (name
, ".text.", 6) == 0)
764 size_t len
= strlen (name
) + 1;
765 char *rname
= (char *) alloca (len
+ 2);
767 memcpy (rname
, ".rodata", 7);
768 memcpy (rname
+ 7, name
+ 5, len
- 5);
769 return get_section (rname
, 0, decl
);
773 return readonly_data_section
;
776 /* Return the read-only data section associated with function DECL
777 for targets where that section should be always the single
778 readonly data section. */
781 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
783 return readonly_data_section
;
786 /* Return the section to use for string merging. */
789 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
790 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
791 unsigned int flags ATTRIBUTE_UNUSED
)
795 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
796 && TREE_CODE (decl
) == STRING_CST
797 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
799 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
800 && TREE_STRING_LENGTH (decl
) >= len
)
803 unsigned int modesize
;
807 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
808 char *name
= (char *) alloca (strlen (prefix
) + 30);
810 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
811 modesize
= GET_MODE_BITSIZE (mode
);
812 if (modesize
>= 8 && modesize
<= 256
813 && (modesize
& (modesize
- 1)) == 0)
815 if (align
< modesize
)
818 str
= TREE_STRING_POINTER (decl
);
819 unit
= GET_MODE_SIZE (mode
);
821 /* Check for embedded NUL characters. */
822 for (i
= 0; i
< len
; i
+= unit
)
824 for (j
= 0; j
< unit
; j
++)
825 if (str
[i
+ j
] != '\0')
832 sprintf (name
, "%s.str%d.%d", prefix
,
833 modesize
/ 8, (int) (align
/ 8));
834 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
835 return get_section (name
, flags
, NULL
);
840 return readonly_data_section
;
843 /* Return the section to use for constant merging. */
846 mergeable_constant_section (machine_mode mode ATTRIBUTE_UNUSED
,
847 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
848 unsigned int flags ATTRIBUTE_UNUSED
)
850 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
852 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
858 && (align
& (align
- 1)) == 0)
860 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
861 char *name
= (char *) alloca (strlen (prefix
) + 30);
863 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
864 flags
|= (align
/ 8) | SECTION_MERGE
;
865 return get_section (name
, flags
, NULL
);
867 return readonly_data_section
;
870 /* Given NAME, a putative register name, discard any customary prefixes. */
873 strip_reg_name (const char *name
)
875 #ifdef REGISTER_PREFIX
876 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
877 name
+= strlen (REGISTER_PREFIX
);
879 if (name
[0] == '%' || name
[0] == '#')
884 /* The user has asked for a DECL to have a particular name. Set (or
885 change) it in such a way that we don't prefix an underscore to
888 set_user_assembler_name (tree decl
, const char *name
)
890 char *starred
= (char *) alloca (strlen (name
) + 2);
892 strcpy (starred
+ 1, name
);
893 symtab
->change_decl_assembler_name (decl
, get_identifier (starred
));
894 SET_DECL_RTL (decl
, NULL_RTX
);
897 /* Decode an `asm' spec for a declaration as a register name.
898 Return the register number, or -1 if nothing specified,
899 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
900 or -3 if ASMSPEC is `cc' and is not recognized,
901 or -4 if ASMSPEC is `memory' and is not recognized.
902 Accept an exact spelling or a decimal number.
903 Prefixes such as % are optional. */
906 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
908 /* Presume just one register is clobbered. */
915 /* Get rid of confusing prefixes. */
916 asmspec
= strip_reg_name (asmspec
);
918 /* Allow a decimal number as a "register name". */
919 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
920 if (! ISDIGIT (asmspec
[i
]))
922 if (asmspec
[0] != 0 && i
< 0)
925 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0 && reg_names
[i
][0])
931 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
933 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
936 #ifdef OVERLAPPING_REGISTER_NAMES
940 const char *const name
;
943 } table
[] = OVERLAPPING_REGISTER_NAMES
;
945 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
947 && ! strcmp (asmspec
, table
[i
].name
))
949 *pnregs
= table
[i
].nregs
;
950 return table
[i
].number
;
953 #endif /* OVERLAPPING_REGISTER_NAMES */
955 #ifdef ADDITIONAL_REGISTER_NAMES
957 static const struct { const char *const name
; const int number
; } table
[]
958 = ADDITIONAL_REGISTER_NAMES
;
960 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
962 && ! strcmp (asmspec
, table
[i
].name
)
963 && reg_names
[table
[i
].number
][0])
964 return table
[i
].number
;
966 #endif /* ADDITIONAL_REGISTER_NAMES */
968 if (!strcmp (asmspec
, "memory"))
971 if (!strcmp (asmspec
, "cc"))
981 decode_reg_name (const char *name
)
984 return decode_reg_name_and_count (name
, &count
);
988 /* Return true if DECL's initializer is suitable for a BSS section. */
991 bss_initializer_p (const_tree decl
)
993 return (DECL_INITIAL (decl
) == NULL
994 /* In LTO we have no errors in program; error_mark_node is used
995 to mark offlined constructors. */
996 || (DECL_INITIAL (decl
) == error_mark_node
998 || (flag_zero_initialized_in_bss
999 /* Leave constant zeroes in .rodata so they
1001 && !TREE_READONLY (decl
)
1002 && initializer_zerop (DECL_INITIAL (decl
))));
1005 /* Compute the alignment of variable specified by DECL.
1006 DONT_OUTPUT_DATA is from assemble_variable. */
1009 align_variable (tree decl
, bool dont_output_data
)
1011 unsigned int align
= DECL_ALIGN (decl
);
1013 /* In the case for initialing an array whose length isn't specified,
1014 where we have not yet been able to do the layout,
1015 figure out the proper alignment now. */
1016 if (dont_output_data
&& DECL_SIZE (decl
) == 0
1017 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
1018 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
1020 /* Some object file formats have a maximum alignment which they support.
1021 In particular, a.out format supports a maximum alignment of 4. */
1022 if (align
> MAX_OFILE_ALIGNMENT
)
1024 error ("alignment of %q+D is greater than maximum object "
1025 "file alignment %d", decl
,
1026 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
1027 align
= MAX_OFILE_ALIGNMENT
;
1030 if (! DECL_USER_ALIGN (decl
))
1032 #ifdef DATA_ABI_ALIGNMENT
1033 unsigned int data_abi_align
1034 = DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1035 /* For backwards compatibility, don't assume the ABI alignment for
1037 if (! DECL_THREAD_LOCAL_P (decl
) || data_abi_align
<= BITS_PER_WORD
)
1038 align
= data_abi_align
;
1041 /* On some machines, it is good to increase alignment sometimes.
1042 But as DECL_ALIGN is used both for actually emitting the variable
1043 and for code accessing the variable as guaranteed alignment, we
1044 can only increase the alignment if it is a performance optimization
1045 if the references to it must bind to the current definition. */
1046 if (decl_binds_to_current_def_p (decl
)
1047 && !DECL_VIRTUAL_P (decl
))
1049 #ifdef DATA_ALIGNMENT
1050 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1051 /* Don't increase alignment too much for TLS variables - TLS space
1053 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1056 #ifdef CONSTANT_ALIGNMENT
1057 if (DECL_INITIAL (decl
) != 0
1058 /* In LTO we have no errors in program; error_mark_node is used
1059 to mark offlined constructors. */
1060 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1062 unsigned int const_align
1063 = CONSTANT_ALIGNMENT (DECL_INITIAL (decl
), align
);
1064 /* Don't increase alignment too much for TLS variables - TLS
1065 space is too precious. */
1066 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1067 align
= const_align
;
1073 /* Reset the alignment in case we have made it tighter, so we can benefit
1074 from it in get_pointer_alignment. */
1075 DECL_ALIGN (decl
) = align
;
1078 /* Return DECL_ALIGN (decl), possibly increased for optimization purposes
1079 beyond what align_variable returned. */
1082 get_variable_align (tree decl
)
1084 unsigned int align
= DECL_ALIGN (decl
);
1086 /* For user aligned vars or static vars align_variable already did
1088 if (DECL_USER_ALIGN (decl
) || !TREE_PUBLIC (decl
))
1091 #ifdef DATA_ABI_ALIGNMENT
1092 if (DECL_THREAD_LOCAL_P (decl
))
1093 align
= DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1096 /* For decls that bind to the current definition, align_variable
1097 did also everything, except for not assuming ABI required alignment
1098 of TLS variables. For other vars, increase the alignment here
1099 as an optimization. */
1100 if (!decl_binds_to_current_def_p (decl
))
1102 /* On some machines, it is good to increase alignment sometimes. */
1103 #ifdef DATA_ALIGNMENT
1104 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1105 /* Don't increase alignment too much for TLS variables - TLS space
1107 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1110 #ifdef CONSTANT_ALIGNMENT
1111 if (DECL_INITIAL (decl
) != 0
1112 /* In LTO we have no errors in program; error_mark_node is used
1113 to mark offlined constructors. */
1114 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1116 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
1118 /* Don't increase alignment too much for TLS variables - TLS space
1120 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1121 align
= const_align
;
1129 /* Return the section into which the given VAR_DECL or CONST_DECL
1130 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1131 section should be used wherever possible. */
1134 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1136 addr_space_t as
= ADDR_SPACE_GENERIC
;
1138 varpool_node
*vnode
= varpool_node::get (decl
);
1141 vnode
= vnode
->ultimate_alias_target ();
1145 if (TREE_TYPE (decl
) != error_mark_node
)
1146 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1148 /* We need the constructor to figure out reloc flag. */
1150 vnode
->get_constructor ();
1152 if (DECL_COMMON (decl
))
1154 /* If the decl has been given an explicit section name, or it resides
1155 in a non-generic address space, then it isn't common, and shouldn't
1156 be handled as such. */
1157 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1158 && ADDR_SPACE_GENERIC_P (as
));
1159 if (DECL_THREAD_LOCAL_P (decl
))
1160 return tls_comm_section
;
1161 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1162 return comm_section
;
1165 if (DECL_INITIAL (decl
) == error_mark_node
)
1166 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1167 else if (DECL_INITIAL (decl
))
1168 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1172 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1173 if (IN_NAMED_SECTION (decl
))
1174 return get_named_section (decl
, NULL
, reloc
);
1176 if (ADDR_SPACE_GENERIC_P (as
)
1177 && !DECL_THREAD_LOCAL_P (decl
)
1178 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1179 && bss_initializer_p (decl
))
1181 if (!TREE_PUBLIC (decl
)
1182 && !((flag_sanitize
& SANITIZE_ADDRESS
)
1183 && asan_protect_global (decl
)))
1184 return lcomm_section
;
1185 if (bss_noswitch_section
)
1186 return bss_noswitch_section
;
1189 return targetm
.asm_out
.select_section (decl
, reloc
,
1190 get_variable_align (decl
));
1193 /* Return the block into which object_block DECL should be placed. */
1195 static struct object_block
*
1196 get_block_for_decl (tree decl
)
1200 if (TREE_CODE (decl
) == VAR_DECL
)
1202 /* The object must be defined in this translation unit. */
1203 if (DECL_EXTERNAL (decl
))
1206 /* There's no point using object blocks for something that is
1207 isolated by definition. */
1208 if (DECL_COMDAT_GROUP (decl
))
1212 /* We can only calculate block offsets if the decl has a known
1214 if (DECL_SIZE_UNIT (decl
) == NULL
)
1216 if (!tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
)))
1219 /* Find out which section should contain DECL. We cannot put it into
1220 an object block if it requires a standalone definition. */
1221 if (TREE_CODE (decl
) == VAR_DECL
)
1222 align_variable (decl
, 0);
1223 sect
= get_variable_section (decl
, true);
1224 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1227 return get_block_for_section (sect
);
1230 /* Make sure block symbol SYMBOL is in block BLOCK. */
1233 change_symbol_block (rtx symbol
, struct object_block
*block
)
1235 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1237 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1238 SYMBOL_REF_BLOCK (symbol
) = block
;
1242 /* Return true if it is possible to put DECL in an object_block. */
1245 use_blocks_for_decl_p (tree decl
)
1247 struct symtab_node
*snode
;
1249 /* Only data DECLs can be placed into object blocks. */
1250 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1253 /* Detect decls created by dw2_force_const_mem. Such decls are
1254 special because DECL_INITIAL doesn't specify the decl's true value.
1255 dw2_output_indirect_constants will instead call assemble_variable
1256 with dont_output_data set to 1 and then print the contents itself. */
1257 if (DECL_INITIAL (decl
) == decl
)
1260 /* If this decl is an alias, then we don't want to emit a
1262 if (TREE_CODE (decl
) == VAR_DECL
1263 && (snode
= symtab_node::get (decl
)) != NULL
1267 return targetm
.use_blocks_for_decl_p (decl
);
1270 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
1271 until we find an identifier that is not itself a transparent alias.
1272 Modify the alias passed to it by reference (and all aliases on the
1273 way to the ultimate target), such that they do not have to be
1274 followed again, and return the ultimate target of the alias
1278 ultimate_transparent_alias_target (tree
*alias
)
1280 tree target
= *alias
;
1282 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
1284 gcc_assert (TREE_CHAIN (target
));
1285 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
1286 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
1287 && ! TREE_CHAIN (target
));
1294 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1295 have static storage duration. In other words, it should not be an
1296 automatic variable, including PARM_DECLs.
1298 There is, however, one exception: this function handles variables
1299 explicitly placed in a particular register by the user.
1301 This is never called for PARM_DECL nodes. */
1304 make_decl_rtl (tree decl
)
1306 const char *name
= 0;
1311 /* Check that we are not being given an automatic variable. */
1312 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1313 && TREE_CODE (decl
) != RESULT_DECL
);
1315 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1316 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1317 || TREE_STATIC (decl
)
1318 || TREE_PUBLIC (decl
)
1319 || DECL_EXTERNAL (decl
)
1320 || DECL_REGISTER (decl
));
1322 /* And that we were not given a type or a label. */
1323 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1324 && TREE_CODE (decl
) != LABEL_DECL
);
1326 /* For a duplicate declaration, we can be called twice on the
1327 same DECL node. Don't discard the RTL already made. */
1328 if (DECL_RTL_SET_P (decl
))
1330 /* If the old RTL had the wrong mode, fix the mode. */
1331 x
= DECL_RTL (decl
);
1332 if (GET_MODE (x
) != DECL_MODE (decl
))
1333 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1335 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1338 /* ??? Another way to do this would be to maintain a hashed
1339 table of such critters. Instead of adding stuff to a DECL
1340 to give certain attributes to it, we could use an external
1341 hash map from DECL to set of attributes. */
1343 /* Let the target reassign the RTL if it wants.
1344 This is necessary, for example, when one machine specific
1345 decl attribute overrides another. */
1346 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1348 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1349 on the new decl information. */
1351 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1352 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1353 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1358 /* If this variable belongs to the global constant pool, retrieve the
1359 pre-computed RTL or recompute it in LTO mode. */
1360 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_IN_CONSTANT_POOL (decl
))
1362 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1366 id
= DECL_ASSEMBLER_NAME (decl
);
1367 if (TREE_CODE (decl
) == FUNCTION_DECL
1368 && cgraph_node::get (decl
)
1369 && cgraph_node::get (decl
)->instrumentation_clone
)
1370 ultimate_transparent_alias_target (&id
);
1371 name
= IDENTIFIER_POINTER (id
);
1373 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1374 && DECL_REGISTER (decl
))
1376 error ("register name not specified for %q+D", decl
);
1378 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1380 const char *asmspec
= name
+1;
1381 machine_mode mode
= DECL_MODE (decl
);
1382 reg_number
= decode_reg_name (asmspec
);
1383 /* First detect errors in declaring global registers. */
1384 if (reg_number
== -1)
1385 error ("register name not specified for %q+D", decl
);
1386 else if (reg_number
< 0)
1387 error ("invalid register name for %q+D", decl
);
1388 else if (mode
== BLKmode
)
1389 error ("data type of %q+D isn%'t suitable for a register",
1391 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1392 error ("the register specified for %q+D cannot be accessed"
1393 " by the current target", decl
);
1394 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1395 error ("the register specified for %q+D is not general enough"
1396 " to be used as a register variable", decl
);
1397 else if (!HARD_REGNO_MODE_OK (reg_number
, mode
))
1398 error ("register specified for %q+D isn%'t suitable for data type",
1400 /* Now handle properly declared static register variables. */
1405 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1407 DECL_INITIAL (decl
) = 0;
1408 error ("global register variable has initial value");
1410 if (TREE_THIS_VOLATILE (decl
))
1411 warning (OPT_Wvolatile_register_var
,
1412 "optimization may eliminate reads and/or "
1413 "writes to register variables");
1415 /* If the user specified one of the eliminables registers here,
1416 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1417 confused with that register and be eliminated. This usage is
1418 somewhat suspect... */
1420 SET_DECL_RTL (decl
, gen_rtx_raw_REG (mode
, reg_number
));
1421 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1422 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1424 if (TREE_STATIC (decl
))
1426 /* Make this register global, so not usable for anything
1428 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1429 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1430 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1432 nregs
= hard_regno_nregs
[reg_number
][mode
];
1434 globalize_reg (decl
, reg_number
+ --nregs
);
1437 /* As a register variable, it has no section. */
1440 /* Avoid internal errors from invalid register
1442 SET_DECL_ASSEMBLER_NAME (decl
, NULL_TREE
);
1443 DECL_HARD_REGISTER (decl
) = 0;
1446 /* Now handle ordinary static variables and functions (in memory).
1447 Also handle vars declared register invalidly. */
1448 else if (name
[0] == '*')
1450 #ifdef REGISTER_PREFIX
1451 if (strlen (REGISTER_PREFIX
) != 0)
1453 reg_number
= decode_reg_name (name
);
1454 if (reg_number
>= 0 || reg_number
== -3)
1455 error ("register name given for non-register variable %q+D", decl
);
1460 /* Specifying a section attribute on a variable forces it into a
1461 non-.bss section, and thus it cannot be common. */
1462 /* FIXME: In general this code should not be necessary because
1463 visibility pass is doing the same work. But notice_global_symbol
1464 is called early and it needs to make DECL_RTL to get the name.
1465 we take care of recomputing the DECL_RTL after visibility is changed. */
1466 if (TREE_CODE (decl
) == VAR_DECL
1467 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
))
1468 && DECL_SECTION_NAME (decl
) != NULL
1469 && DECL_INITIAL (decl
) == NULL_TREE
1470 && DECL_COMMON (decl
))
1471 DECL_COMMON (decl
) = 0;
1473 /* Variables can't be both common and weak. */
1474 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1475 DECL_COMMON (decl
) = 0;
1477 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1478 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1481 machine_mode address_mode
= Pmode
;
1482 if (TREE_TYPE (decl
) != error_mark_node
)
1484 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1485 address_mode
= targetm
.addr_space
.address_mode (as
);
1487 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1489 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1490 SET_SYMBOL_REF_DECL (x
, decl
);
1492 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1493 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1494 set_mem_attributes (x
, decl
, 1);
1495 SET_DECL_RTL (decl
, x
);
1497 /* Optionally set flags or add text to the name to record information
1498 such as that it is a function name.
1499 If the name is changed, the macro ASM_OUTPUT_LABELREF
1500 will have to know how to strip this information. */
1501 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1504 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1505 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1509 make_decl_rtl_for_debug (tree decl
)
1511 unsigned int save_aliasing_flag
;
1514 if (DECL_RTL_SET_P (decl
))
1515 return DECL_RTL (decl
);
1517 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1518 call new_alias_set. If running with -fcompare-debug, sometimes
1519 we do not want to create alias sets that will throw the alias
1520 numbers off in the comparison dumps. So... clearing
1521 flag_strict_aliasing will keep new_alias_set() from creating a
1523 save_aliasing_flag
= flag_strict_aliasing
;
1524 flag_strict_aliasing
= 0;
1526 rtl
= DECL_RTL (decl
);
1527 /* Reset DECL_RTL back, as various parts of the compiler expects
1528 DECL_RTL set meaning it is actually going to be output. */
1529 SET_DECL_RTL (decl
, NULL
);
1531 flag_strict_aliasing
= save_aliasing_flag
;
1535 /* Output a string of literal assembler code
1536 for an `asm' keyword used between functions. */
1539 assemble_asm (tree string
)
1544 if (TREE_CODE (string
) == ADDR_EXPR
)
1545 string
= TREE_OPERAND (string
, 0);
1547 p
= TREE_STRING_POINTER (string
);
1548 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1551 /* Write the address of the entity given by SYMBOL to SEC. */
1553 assemble_addr_to_section (rtx symbol
, section
*sec
)
1555 switch_to_section (sec
);
1556 assemble_align (POINTER_SIZE
);
1557 assemble_integer (symbol
, POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
1560 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1561 not) section for PRIORITY. */
1563 get_cdtor_priority_section (int priority
, bool constructor_p
)
1567 /* ??? This only works reliably with the GNU linker. */
1568 sprintf (buf
, "%s.%.5u",
1569 constructor_p
? ".ctors" : ".dtors",
1570 /* Invert the numbering so the linker puts us in the proper
1571 order; constructors are run from right to left, and the
1572 linker sorts in increasing order. */
1573 MAX_INIT_PRIORITY
- priority
);
1574 return get_section (buf
, SECTION_WRITE
, NULL
);
1578 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1582 if (priority
!= DEFAULT_INIT_PRIORITY
)
1583 sec
= get_cdtor_priority_section (priority
,
1584 /*constructor_p=*/false);
1586 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1588 assemble_addr_to_section (symbol
, sec
);
1591 #ifdef DTORS_SECTION_ASM_OP
1593 default_dtor_section_asm_out_destructor (rtx symbol
,
1594 int priority ATTRIBUTE_UNUSED
)
1596 assemble_addr_to_section (symbol
, dtors_section
);
1601 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1605 if (priority
!= DEFAULT_INIT_PRIORITY
)
1606 sec
= get_cdtor_priority_section (priority
,
1607 /*constructor_p=*/true);
1609 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1611 assemble_addr_to_section (symbol
, sec
);
1614 #ifdef CTORS_SECTION_ASM_OP
1616 default_ctor_section_asm_out_constructor (rtx symbol
,
1617 int priority ATTRIBUTE_UNUSED
)
1619 assemble_addr_to_section (symbol
, ctors_section
);
1623 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1624 a nonzero value if the constant pool should be output before the
1625 start of the function, or a zero value if the pool should output
1626 after the end of the function. The default is to put it before the
1629 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1630 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1633 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1634 to be output to assembler.
1635 Set first_global_object_name and weak_global_object_name as appropriate. */
1638 notice_global_symbol (tree decl
)
1640 const char **t
= &first_global_object_name
;
1642 if (first_global_object_name
1643 || !TREE_PUBLIC (decl
)
1644 || DECL_EXTERNAL (decl
)
1645 || !DECL_NAME (decl
)
1646 || (TREE_CODE (decl
) == VAR_DECL
&& DECL_HARD_REGISTER (decl
))
1647 || (TREE_CODE (decl
) != FUNCTION_DECL
1648 && (TREE_CODE (decl
) != VAR_DECL
1649 || (DECL_COMMON (decl
)
1650 && (DECL_INITIAL (decl
) == 0
1651 || DECL_INITIAL (decl
) == error_mark_node
)))))
1654 /* We win when global object is found, but it is useful to know about weak
1655 symbol as well so we can produce nicer unique names. */
1656 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1657 t
= &weak_global_object_name
;
1661 tree id
= DECL_ASSEMBLER_NAME (decl
);
1662 ultimate_transparent_alias_target (&id
);
1663 *t
= ggc_strdup (targetm
.strip_name_encoding (IDENTIFIER_POINTER (id
)));
1667 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1668 current function goes into the cold section, so that targets can use
1669 current_function_section during RTL expansion. DECL describes the
1673 decide_function_section (tree decl
)
1675 first_function_block_is_cold
= false;
1677 if (flag_reorder_blocks_and_partition
)
1678 /* We will decide in assemble_start_function. */
1681 if (DECL_SECTION_NAME (decl
))
1683 struct cgraph_node
*node
= cgraph_node::get (current_function_decl
);
1684 /* Calls to function_section rely on first_function_block_is_cold
1686 first_function_block_is_cold
= (node
1688 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1691 in_cold_section_p
= first_function_block_is_cold
;
1694 /* Get the function's name, as described by its RTL. This may be
1695 different from the DECL_NAME name used in the source file. */
1697 get_fnname_from_decl (tree decl
)
1699 rtx x
= DECL_RTL (decl
);
1700 gcc_assert (MEM_P (x
));
1702 gcc_assert (GET_CODE (x
) == SYMBOL_REF
);
1706 /* Output assembler code for the constant pool of a function and associated
1707 with defining the name of the function. DECL describes the function.
1708 NAME is the function's name. For the constant pool, we use the current
1709 constant pool data. */
1712 assemble_start_function (tree decl
, const char *fnname
)
1715 char tmp_label
[100];
1716 bool hot_label_written
= false;
1718 if (flag_reorder_blocks_and_partition
)
1720 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1721 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1722 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1723 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1724 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1725 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1726 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1727 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1729 cold_function_name
= NULL_TREE
;
1733 crtl
->subsections
.hot_section_label
= NULL
;
1734 crtl
->subsections
.cold_section_label
= NULL
;
1735 crtl
->subsections
.hot_section_end_label
= NULL
;
1736 crtl
->subsections
.cold_section_end_label
= NULL
;
1739 /* The following code does not need preprocessing in the assembler. */
1743 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1744 output_constant_pool (fnname
, decl
);
1746 align
= symtab_node::get (decl
)->definition_alignment ();
1748 /* Make sure the not and cold text (code) sections are properly
1749 aligned. This is necessary here in the case where the function
1750 has both hot and cold sections, because we don't want to re-set
1751 the alignment when the section switch happens mid-function. */
1753 if (flag_reorder_blocks_and_partition
)
1755 first_function_block_is_cold
= false;
1757 switch_to_section (unlikely_text_section ());
1758 assemble_align (align
);
1759 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1761 /* When the function starts with a cold section, we need to explicitly
1762 align the hot section and write out the hot section label.
1763 But if the current function is a thunk, we do not have a CFG. */
1765 && BB_PARTITION (ENTRY_BLOCK_PTR_FOR_FN (cfun
)->next_bb
) == BB_COLD_PARTITION
)
1767 switch_to_section (text_section
);
1768 assemble_align (align
);
1769 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1770 hot_label_written
= true;
1771 first_function_block_is_cold
= true;
1773 in_cold_section_p
= first_function_block_is_cold
;
1777 /* Switch to the correct text section for the start of the function. */
1779 switch_to_section (function_section (decl
));
1780 if (flag_reorder_blocks_and_partition
1781 && !hot_label_written
)
1782 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1784 /* Tell assembler to move to target machine's alignment for functions. */
1785 align
= floor_log2 (align
/ BITS_PER_UNIT
);
1788 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1791 /* Handle a user-specified function alignment.
1792 Note that we still need to align to DECL_ALIGN, as above,
1793 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1794 if (! DECL_USER_ALIGN (decl
)
1795 && align_functions_log
> align
1796 && optimize_function_for_speed_p (cfun
))
1798 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1799 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1800 align_functions_log
, align_functions
- 1);
1802 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1806 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1807 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1810 if (!DECL_IGNORED_P (decl
))
1811 (*debug_hooks
->begin_function
) (decl
);
1813 /* Make function name accessible from other files, if appropriate. */
1815 if (TREE_PUBLIC (decl
)
1816 || (cgraph_node::get (decl
)->instrumentation_clone
1817 && cgraph_node::get (decl
)->instrumented_version
1818 && TREE_PUBLIC (cgraph_node::get (decl
)->instrumented_version
->decl
)))
1820 notice_global_symbol (decl
);
1822 globalize_decl (decl
);
1824 maybe_assemble_visibility (decl
);
1827 if (DECL_PRESERVE_P (decl
))
1828 targetm
.asm_out
.mark_decl_preserved (fnname
);
1830 /* Do any machine/system dependent processing of the function name. */
1831 #ifdef ASM_DECLARE_FUNCTION_NAME
1832 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1834 /* Standard thing is just output label for the function. */
1835 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1836 #endif /* ASM_DECLARE_FUNCTION_NAME */
1838 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1839 saw_no_split_stack
= true;
1842 /* Output assembler code associated with defining the size of the
1843 function. DECL describes the function. NAME is the function's name. */
1846 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1848 #ifdef ASM_DECLARE_FUNCTION_SIZE
1849 /* We could have switched section in the middle of the function. */
1850 if (flag_reorder_blocks_and_partition
)
1851 switch_to_section (function_section (decl
));
1852 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1854 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1856 output_constant_pool (fnname
, decl
);
1857 switch_to_section (function_section (decl
)); /* need to switch back */
1859 /* Output labels for end of hot/cold text sections (to be used by
1861 if (flag_reorder_blocks_and_partition
)
1863 section
*save_text_section
;
1865 save_text_section
= in_section
;
1866 switch_to_section (unlikely_text_section ());
1867 #ifdef ASM_DECLARE_FUNCTION_SIZE
1868 if (cold_function_name
!= NULL_TREE
)
1869 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
,
1870 IDENTIFIER_POINTER (cold_function_name
),
1873 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1874 if (first_function_block_is_cold
)
1875 switch_to_section (text_section
);
1877 switch_to_section (function_section (decl
));
1878 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1879 switch_to_section (save_text_section
);
1883 /* Assemble code to leave SIZE bytes of zeros. */
1886 assemble_zeros (unsigned HOST_WIDE_INT size
)
1888 /* Do no output if -fsyntax-only. */
1889 if (flag_syntax_only
)
1892 #ifdef ASM_NO_SKIP_IN_TEXT
1893 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1894 so we must output 0s explicitly in the text section. */
1895 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1897 unsigned HOST_WIDE_INT i
;
1898 for (i
= 0; i
< size
; i
++)
1899 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1904 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1907 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1910 assemble_align (int align
)
1912 if (align
> BITS_PER_UNIT
)
1914 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1918 /* Assemble a string constant with the specified C string as contents. */
1921 assemble_string (const char *p
, int size
)
1926 /* If the string is very long, split it up. */
1930 int thissize
= size
- pos
;
1931 if (thissize
> maximum
)
1934 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1942 /* A noswitch_section_callback for lcomm_section. */
1945 emit_local (tree decl ATTRIBUTE_UNUSED
,
1946 const char *name ATTRIBUTE_UNUSED
,
1947 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1948 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1950 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1951 int align
= symtab_node::get (decl
)->definition_alignment ();
1952 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1955 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1956 int align
= symtab_node::get (decl
)->definition_alignment ();
1957 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, align
);
1960 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1965 /* A noswitch_section_callback for bss_noswitch_section. */
1967 #if defined ASM_OUTPUT_ALIGNED_BSS
1969 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1970 const char *name ATTRIBUTE_UNUSED
,
1971 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1972 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1974 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
,
1975 get_variable_align (decl
));
1980 /* A noswitch_section_callback for comm_section. */
1983 emit_common (tree decl ATTRIBUTE_UNUSED
,
1984 const char *name ATTRIBUTE_UNUSED
,
1985 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1986 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1988 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1989 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1990 size
, get_variable_align (decl
));
1992 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1993 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
,
1994 get_variable_align (decl
));
1997 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
2002 /* A noswitch_section_callback for tls_comm_section. */
2005 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
2006 const char *name ATTRIBUTE_UNUSED
,
2007 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
2008 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2010 #ifdef ASM_OUTPUT_TLS_COMMON
2011 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
2014 sorry ("thread-local COMMON data not implemented");
2019 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
2020 NAME is the name of DECL's SYMBOL_REF. */
2023 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
,
2026 unsigned HOST_WIDE_INT size
, rounded
;
2028 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2031 if ((flag_sanitize
& SANITIZE_ADDRESS
) && asan_protect_global (decl
))
2032 size
+= asan_red_zone_size (size
);
2034 /* Don't allocate zero bytes of common,
2035 since that means "undefined external" in the linker. */
2039 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2040 so that each uninitialized object starts on such a boundary. */
2041 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
2042 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2043 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2045 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
2046 && (unsigned HOST_WIDE_INT
) (align
/ BITS_PER_UNIT
) > rounded
)
2047 error ("requested alignment for %q+D is greater than "
2048 "implemented alignment of %wu", decl
, rounded
);
2051 /* A subroutine of assemble_variable. Output the label and contents of
2052 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
2053 is as for assemble_variable. */
2056 assemble_variable_contents (tree decl
, const char *name
,
2057 bool dont_output_data
)
2059 /* Do any machine/system dependent processing of the object. */
2060 #ifdef ASM_DECLARE_OBJECT_NAME
2061 last_assemble_variable_decl
= decl
;
2062 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
2064 /* Standard thing is just output label for the object. */
2065 ASM_OUTPUT_LABEL (asm_out_file
, name
);
2066 #endif /* ASM_DECLARE_OBJECT_NAME */
2068 if (!dont_output_data
)
2070 /* Caller is supposed to use varpool_get_constructor when it wants
2071 to output the body. */
2072 gcc_assert (!in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
);
2073 if (DECL_INITIAL (decl
)
2074 && DECL_INITIAL (decl
) != error_mark_node
2075 && !initializer_zerop (DECL_INITIAL (decl
)))
2076 /* Output the actual data. */
2077 output_constant (DECL_INITIAL (decl
),
2078 tree_to_uhwi (DECL_SIZE_UNIT (decl
)),
2079 get_variable_align (decl
));
2081 /* Leave space for it. */
2082 assemble_zeros (tree_to_uhwi (DECL_SIZE_UNIT (decl
)));
2083 targetm
.asm_out
.decl_end ();
2087 /* Write out assembly for the variable DECL, which is not defined in
2088 the current translation unit. */
2090 assemble_undefined_decl (tree decl
)
2092 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
2093 targetm
.asm_out
.assemble_undefined_decl (asm_out_file
, name
, decl
);
2096 /* Assemble everything that is needed for a variable or function declaration.
2097 Not used for automatic variables, and not used for function definitions.
2098 Should not be called for variables of incomplete structure type.
2100 TOP_LEVEL is nonzero if this variable has file scope.
2101 AT_END is nonzero if this is the special handling, at end of compilation,
2102 to define things that have had only tentative definitions.
2103 DONT_OUTPUT_DATA if nonzero means don't actually output the
2104 initial value (that will be done by the caller). */
2107 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
2108 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
2111 rtx decl_rtl
, symbol
;
2114 bool asan_protected
= false;
2116 /* This function is supposed to handle VARIABLES. Ensure we have one. */
2117 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
2119 /* Emulated TLS had better not get this far. */
2120 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
2122 last_assemble_variable_decl
= 0;
2124 /* Normally no need to say anything here for external references,
2125 since assemble_external is called by the language-specific code
2126 when a declaration is first seen. */
2128 if (DECL_EXTERNAL (decl
))
2131 /* Do nothing for global register variables. */
2132 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
2134 TREE_ASM_WRITTEN (decl
) = 1;
2138 /* If type was incomplete when the variable was declared,
2139 see if it is complete now. */
2141 if (DECL_SIZE (decl
) == 0)
2142 layout_decl (decl
, 0);
2144 /* Still incomplete => don't allocate it; treat the tentative defn
2145 (which is what it must have been) as an `extern' reference. */
2147 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2149 error ("storage size of %q+D isn%'t known", decl
);
2150 TREE_ASM_WRITTEN (decl
) = 1;
2154 /* The first declaration of a variable that comes through this function
2155 decides whether it is global (in C, has external linkage)
2156 or local (in C, has internal linkage). So do nothing more
2157 if this function has already run. */
2159 if (TREE_ASM_WRITTEN (decl
))
2162 /* Make sure targetm.encode_section_info is invoked before we set
2164 decl_rtl
= DECL_RTL (decl
);
2166 TREE_ASM_WRITTEN (decl
) = 1;
2168 /* Do no output if -fsyntax-only. */
2169 if (flag_syntax_only
)
2172 if (! dont_output_data
2173 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
2175 error ("size of variable %q+D is too large", decl
);
2179 gcc_assert (MEM_P (decl_rtl
));
2180 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2181 symbol
= XEXP (decl_rtl
, 0);
2183 /* If this symbol belongs to the tree constant pool, output the constant
2184 if it hasn't already been written. */
2185 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
2187 tree decl
= SYMBOL_REF_DECL (symbol
);
2188 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
2189 output_constant_def_contents (symbol
);
2195 name
= XSTR (symbol
, 0);
2196 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2197 notice_global_symbol (decl
);
2199 /* Compute the alignment of this data. */
2201 align_variable (decl
, dont_output_data
);
2203 if ((flag_sanitize
& SANITIZE_ADDRESS
)
2204 && asan_protect_global (decl
))
2206 asan_protected
= true;
2207 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
2208 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
2211 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2213 align
= get_variable_align (decl
);
2215 if (TREE_PUBLIC (decl
))
2216 maybe_assemble_visibility (decl
);
2218 if (DECL_PRESERVE_P (decl
))
2219 targetm
.asm_out
.mark_decl_preserved (name
);
2221 /* First make the assembler name(s) global if appropriate. */
2222 sect
= get_variable_section (decl
, false);
2223 if (TREE_PUBLIC (decl
)
2224 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2225 globalize_decl (decl
);
2227 /* Output any data that we will need to use the address of. */
2228 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2229 output_addressed_constants (DECL_INITIAL (decl
));
2231 /* dbxout.c needs to know this. */
2232 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2233 DECL_IN_TEXT_SECTION (decl
) = 1;
2235 /* If the decl is part of an object_block, make sure that the decl
2236 has been positioned within its block, but do not write out its
2237 definition yet. output_object_blocks will do that later. */
2238 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2240 gcc_assert (!dont_output_data
);
2241 place_block_symbol (symbol
);
2243 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2244 assemble_noswitch_variable (decl
, name
, sect
, align
);
2247 /* The following bit of code ensures that vtable_map
2248 variables are not only in the comdat section, but that
2249 each variable has its own unique comdat name. If this
2250 code is removed, the variables end up in the same section
2251 with a single comdat name.
2253 FIXME: resolve_unique_section needs to deal better with
2254 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
2255 that is fixed, this if-else statement can be replaced with
2256 a single call to "switch_to_section (sect)". */
2257 if (sect
->named
.name
2258 && (strcmp (sect
->named
.name
, ".vtable_map_vars") == 0))
2260 #if defined (OBJECT_FORMAT_ELF)
2261 targetm
.asm_out
.named_section (sect
->named
.name
,
2262 sect
->named
.common
.flags
2266 #elif defined (TARGET_PECOFF)
2267 /* Neither OBJECT_FORMAT_PE, nor OBJECT_FORMAT_COFF is set here.
2268 Therefore the following check is used.
2269 In case a the target is PE or COFF a comdat group section
2270 is created, e.g. .vtable_map_vars$foo. The linker places
2271 everything in .vtable_map_vars at the end.
2273 A fix could be made in
2274 gcc/config/i386/winnt.c: i386_pe_unique_section. */
2279 if (TREE_CODE (DECL_NAME (decl
)) == IDENTIFIER_NODE
)
2280 name
= ACONCAT ((sect
->named
.name
, "$",
2281 IDENTIFIER_POINTER (DECL_NAME (decl
)), NULL
));
2283 name
= ACONCAT ((sect
->named
.name
, "$",
2284 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (DECL_NAME (decl
))),
2287 targetm
.asm_out
.named_section (name
,
2288 sect
->named
.common
.flags
2294 switch_to_section (sect
);
2298 switch_to_section (sect
);
2299 if (align
> BITS_PER_UNIT
)
2300 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
2301 assemble_variable_contents (decl
, name
, dont_output_data
);
2304 unsigned HOST_WIDE_INT
int size
2305 = tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2306 assemble_zeros (asan_red_zone_size (size
));
2312 /* Given a function declaration (FN_DECL), this function assembles the
2313 function into the .preinit_array section. */
2316 assemble_vtv_preinit_initializer (tree fn_decl
)
2319 unsigned flags
= SECTION_WRITE
;
2320 rtx symbol
= XEXP (DECL_RTL (fn_decl
), 0);
2322 flags
|= SECTION_NOTYPE
;
2323 sect
= get_section (".preinit_array", flags
, fn_decl
);
2324 switch_to_section (sect
);
2325 assemble_addr_to_section (symbol
, sect
);
2328 /* Return 1 if type TYPE contains any pointers. */
2331 contains_pointers_p (tree type
)
2333 switch (TREE_CODE (type
))
2336 case REFERENCE_TYPE
:
2337 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2338 so I'll play safe and return 1. */
2344 case QUAL_UNION_TYPE
:
2347 /* For a type that has fields, see if the fields have pointers. */
2348 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2349 if (TREE_CODE (fields
) == FIELD_DECL
2350 && contains_pointers_p (TREE_TYPE (fields
)))
2356 /* An array type contains pointers if its element type does. */
2357 return contains_pointers_p (TREE_TYPE (type
));
2364 /* We delay assemble_external processing until
2365 the compilation unit is finalized. This is the best we can do for
2366 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2367 it all the way to final. See PR 17982 for further discussion. */
2368 static GTY(()) tree pending_assemble_externals
;
2370 #ifdef ASM_OUTPUT_EXTERNAL
2371 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2372 As a result, assemble_external can be called after the list of externals
2373 is processed and the pointer set destroyed. */
2374 static bool pending_assemble_externals_processed
;
2376 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2377 TREE_LIST in assemble_external. */
2378 static hash_set
<tree
> *pending_assemble_externals_set
;
2380 /* True if DECL is a function decl for which no out-of-line copy exists.
2381 It is assumed that DECL's assembler name has been set. */
2384 incorporeal_function_p (tree decl
)
2386 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2390 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2391 && (DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
2392 || DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA_WITH_ALIGN
))
2395 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2396 /* Atomic or sync builtins which have survived this far will be
2397 resolved externally and therefore are not incorporeal. */
2398 if (strncmp (name
, "__builtin_", 10) == 0)
2404 /* Actually do the tests to determine if this is necessary, and invoke
2405 ASM_OUTPUT_EXTERNAL. */
2407 assemble_external_real (tree decl
)
2409 rtx rtl
= DECL_RTL (decl
);
2411 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2412 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2413 && !incorporeal_function_p (decl
))
2415 /* Some systems do require some output. */
2416 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2417 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2423 process_pending_assemble_externals (void)
2425 #ifdef ASM_OUTPUT_EXTERNAL
2427 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2428 assemble_external_real (TREE_VALUE (list
));
2430 pending_assemble_externals
= 0;
2431 pending_assemble_externals_processed
= true;
2432 delete pending_assemble_externals_set
;
2436 /* This TREE_LIST contains any weak symbol declarations waiting
2438 static GTY(()) tree weak_decls
;
2440 /* Output something to declare an external symbol to the assembler,
2441 and qualifiers such as weakness. (Most assemblers don't need
2442 extern declaration, so we normally output nothing.) Do nothing if
2443 DECL is not external. */
2446 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2448 /* Make sure that the ASM_OUT_FILE is open.
2449 If it's not, we should not be calling this function. */
2450 gcc_assert (asm_out_file
);
2452 /* In a perfect world, the following condition would be true.
2453 Sadly, the Java and Go front ends emit assembly *from the front end*,
2454 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2456 /* This function should only be called if we are expanding, or have
2458 Ideally, only final.c would be calling this function, but it is
2459 not clear whether that would break things somehow. See PR 17982
2460 for further discussion. */
2461 gcc_assert (state
== EXPANSION
2462 || state
== FINISHED
);
2465 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2468 /* We want to output annotation for weak and external symbols at
2469 very last to check if they are references or not. */
2471 if (TARGET_SUPPORTS_WEAK
2473 /* TREE_STATIC is a weird and abused creature which is not
2474 generally the right test for whether an entity has been
2475 locally emitted, inlined or otherwise not-really-extern, but
2476 for declarations that can be weak, it happens to be
2478 && !TREE_STATIC (decl
)
2479 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2480 && value_member (decl
, weak_decls
) == NULL_TREE
)
2481 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2483 #ifdef ASM_OUTPUT_EXTERNAL
2484 if (pending_assemble_externals_processed
)
2486 assemble_external_real (decl
);
2490 if (! pending_assemble_externals_set
->add (decl
))
2491 pending_assemble_externals
= tree_cons (NULL
, decl
,
2492 pending_assemble_externals
);
2496 /* Similar, for calling a library function FUN. */
2499 assemble_external_libcall (rtx fun
)
2501 /* Declare library function name external when first used, if nec. */
2502 if (! SYMBOL_REF_USED (fun
))
2504 SYMBOL_REF_USED (fun
) = 1;
2505 targetm
.asm_out
.external_libcall (fun
);
2509 /* Assemble a label named NAME. */
2512 assemble_label (FILE *file
, const char *name
)
2514 ASM_OUTPUT_LABEL (file
, name
);
2517 /* Set the symbol_referenced flag for ID. */
2519 mark_referenced (tree id
)
2521 TREE_SYMBOL_REFERENCED (id
) = 1;
2524 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2526 mark_decl_referenced (tree decl
)
2528 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2530 /* Extern inline functions don't become needed when referenced.
2531 If we know a method will be emitted in other TU and no new
2532 functions can be marked reachable, just use the external
2534 struct cgraph_node
*node
= cgraph_node::get_create (decl
);
2535 if (!DECL_EXTERNAL (decl
)
2536 && !node
->definition
)
2537 node
->mark_force_output ();
2539 else if (TREE_CODE (decl
) == VAR_DECL
)
2541 varpool_node
*node
= varpool_node::get_create (decl
);
2542 /* C++ frontend use mark_decl_references to force COMDAT variables
2543 to be output that might appear dead otherwise. */
2544 node
->force_output
= true;
2546 /* else do nothing - we can get various sorts of CST nodes here,
2547 which do not need to be marked. */
2551 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2552 starts with a *, the rest of NAME is output verbatim. Otherwise
2553 NAME is transformed in a target-specific way (usually by the
2554 addition of an underscore). */
2557 assemble_name_raw (FILE *file
, const char *name
)
2560 fputs (&name
[1], file
);
2562 ASM_OUTPUT_LABELREF (file
, name
);
2565 /* Like assemble_name_raw, but should be used when NAME might refer to
2566 an entity that is also represented as a tree (like a function or
2567 variable). If NAME does refer to such an entity, that entity will
2568 be marked as referenced. */
2571 assemble_name (FILE *file
, const char *name
)
2573 const char *real_name
;
2576 real_name
= targetm
.strip_name_encoding (name
);
2578 id
= maybe_get_identifier (real_name
);
2583 mark_referenced (id
);
2584 ultimate_transparent_alias_target (&id
);
2586 name
= IDENTIFIER_POINTER (id
);
2587 gcc_assert (! TREE_CHAIN (id
));
2590 assemble_name_raw (file
, name
);
2593 /* Allocate SIZE bytes writable static space with a gensym name
2594 and return an RTX to refer to its address. */
2597 assemble_static_space (unsigned HOST_WIDE_INT size
)
2600 const char *namestring
;
2603 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2605 namestring
= ggc_strdup (name
);
2607 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2608 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2610 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2611 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2614 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2615 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2618 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2619 so that each uninitialized object starts on such a boundary. */
2620 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2621 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2622 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2623 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2624 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2625 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2632 /* Assemble the static constant template for function entry trampolines.
2633 This is done at most once per compilation.
2634 Returns an RTX for the address of the template. */
2636 static GTY(()) rtx initial_trampoline
;
2639 assemble_trampoline_template (void)
2646 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2648 if (initial_trampoline
)
2649 return initial_trampoline
;
2651 /* By default, put trampoline templates in read-only data section. */
2653 #ifdef TRAMPOLINE_SECTION
2654 switch_to_section (TRAMPOLINE_SECTION
);
2656 switch_to_section (readonly_data_section
);
2659 /* Write the assembler code to define one. */
2660 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2662 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2664 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2665 targetm
.asm_out
.trampoline_template (asm_out_file
);
2667 /* Record the rtl to refer to it. */
2668 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2669 name
= ggc_strdup (label
);
2670 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2671 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2673 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2674 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2675 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2677 return initial_trampoline
;
2680 /* A and B are either alignments or offsets. Return the minimum alignment
2681 that may be assumed after adding the two together. */
2683 static inline unsigned
2684 min_align (unsigned int a
, unsigned int b
)
2686 return (a
| b
) & -(a
| b
);
2689 /* Return the assembler directive for creating a given kind of integer
2690 object. SIZE is the number of bytes in the object and ALIGNED_P
2691 indicates whether it is known to be aligned. Return NULL if the
2692 assembly dialect has no such directive.
2694 The returned string should be printed at the start of a new line and
2695 be followed immediately by the object's initial value. */
2698 integer_asm_op (int size
, int aligned_p
)
2700 struct asm_int_op
*ops
;
2703 ops
= &targetm
.asm_out
.aligned_op
;
2705 ops
= &targetm
.asm_out
.unaligned_op
;
2710 return targetm
.asm_out
.byte_op
;
2724 /* Use directive OP to assemble an integer object X. Print OP at the
2725 start of the line, followed immediately by the value of X. */
2728 assemble_integer_with_op (const char *op
, rtx x
)
2730 fputs (op
, asm_out_file
);
2731 output_addr_const (asm_out_file
, x
);
2732 fputc ('\n', asm_out_file
);
2735 /* The default implementation of the asm_out.integer target hook. */
2738 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2739 unsigned int size ATTRIBUTE_UNUSED
,
2740 int aligned_p ATTRIBUTE_UNUSED
)
2742 const char *op
= integer_asm_op (size
, aligned_p
);
2743 /* Avoid GAS bugs for large values. Specifically negative values whose
2744 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2745 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE_UNITS
)
2747 return op
&& (assemble_integer_with_op (op
, x
), true);
2750 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2751 the alignment of the integer in bits. Return 1 if we were able to output
2752 the constant, otherwise 0. We must be able to output the constant,
2753 if FORCE is nonzero. */
2756 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2760 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2762 /* See if the target hook can handle this kind of object. */
2763 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2766 /* If the object is a multi-byte one, try splitting it up. Split
2767 it into words it if is multi-word, otherwise split it into bytes. */
2770 machine_mode omode
, imode
;
2771 unsigned int subalign
;
2772 unsigned int subsize
, i
;
2773 enum mode_class mclass
;
2775 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2776 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2777 if (GET_CODE (x
) == CONST_FIXED
)
2778 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2782 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2783 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2785 for (i
= 0; i
< size
; i
+= subsize
)
2787 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2788 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2794 /* If we've printed some of it, but not all of it, there's no going
2799 gcc_assert (!force
);
2805 assemble_real (REAL_VALUE_TYPE d
, machine_mode mode
, unsigned int align
)
2807 long data
[4] = {0, 0, 0, 0};
2809 int bitsize
, nelts
, nunits
, units_per
;
2811 /* This is hairy. We have a quantity of known size. real_to_target
2812 will put it into an array of *host* longs, 32 bits per element
2813 (even if long is more than 32 bits). We need to determine the
2814 number of array elements that are occupied (nelts) and the number
2815 of *target* min-addressable units that will be occupied in the
2816 object file (nunits). We cannot assume that 32 divides the
2817 mode's bitsize (size * BITS_PER_UNIT) evenly.
2819 size * BITS_PER_UNIT is used here to make sure that padding bits
2820 (which might appear at either end of the value; real_to_target
2821 will include the padding bits in its output array) are included. */
2823 nunits
= GET_MODE_SIZE (mode
);
2824 bitsize
= nunits
* BITS_PER_UNIT
;
2825 nelts
= CEIL (bitsize
, 32);
2826 units_per
= 32 / BITS_PER_UNIT
;
2828 real_to_target (data
, &d
, mode
);
2830 /* Put out the first word with the specified alignment. */
2831 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2832 nunits
-= units_per
;
2834 /* Subsequent words need only 32-bit alignment. */
2835 align
= min_align (align
, 32);
2837 for (i
= 1; i
< nelts
; i
++)
2839 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2840 nunits
-= units_per
;
2844 /* Given an expression EXP with a constant value,
2845 reduce it to the sum of an assembler symbol and an integer.
2846 Store them both in the structure *VALUE.
2847 EXP must be reducible. */
2851 HOST_WIDE_INT offset
;
2855 decode_addr_const (tree exp
, struct addr_const
*value
)
2857 tree target
= TREE_OPERAND (exp
, 0);
2863 if (TREE_CODE (target
) == COMPONENT_REF
2864 && tree_fits_shwi_p (byte_position (TREE_OPERAND (target
, 1))))
2866 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2867 target
= TREE_OPERAND (target
, 0);
2869 else if (TREE_CODE (target
) == ARRAY_REF
2870 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2872 offset
+= (tree_to_uhwi (TYPE_SIZE_UNIT (TREE_TYPE (target
)))
2873 * tree_to_shwi (TREE_OPERAND (target
, 1)));
2874 target
= TREE_OPERAND (target
, 0);
2876 else if (TREE_CODE (target
) == MEM_REF
2877 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2879 offset
+= mem_ref_offset (target
).to_short_addr ();
2880 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2882 else if (TREE_CODE (target
) == INDIRECT_REF
2883 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2884 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2886 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2891 switch (TREE_CODE (target
))
2895 x
= DECL_RTL (target
);
2899 x
= gen_rtx_MEM (FUNCTION_MODE
,
2900 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2909 x
= output_constant_def (target
, 1);
2916 gcc_assert (MEM_P (x
));
2920 value
->offset
= offset
;
2923 static GTY(()) hash_table
<tree_descriptor_hasher
> *const_desc_htab
;
2925 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2927 /* Constant pool accessor function. */
2929 hash_table
<tree_descriptor_hasher
> *
2930 constant_pool_htab (void)
2932 return const_desc_htab
;
2935 /* Compute a hash code for a constant expression. */
2938 tree_descriptor_hasher::hash (constant_descriptor_tree
*ptr
)
2944 const_hash_1 (const tree exp
)
2949 enum tree_code code
= TREE_CODE (exp
);
2951 /* Either set P and LEN to the address and len of something to hash and
2952 exit the switch or return a value. */
2957 p
= (char *) &TREE_INT_CST_ELT (exp
, 0);
2958 len
= TREE_INT_CST_NUNITS (exp
) * sizeof (HOST_WIDE_INT
);
2962 return real_hash (TREE_REAL_CST_PTR (exp
));
2965 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2968 p
= TREE_STRING_POINTER (exp
);
2969 len
= TREE_STRING_LENGTH (exp
);
2973 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2974 + const_hash_1 (TREE_IMAGPART (exp
)));
2980 hi
= 7 + VECTOR_CST_NELTS (exp
);
2982 for (i
= 0; i
< VECTOR_CST_NELTS (exp
); ++i
)
2983 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ELT (exp
, i
));
2990 unsigned HOST_WIDE_INT idx
;
2993 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2995 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2997 hi
= hi
* 603 + const_hash_1 (value
);
3005 struct addr_const value
;
3007 decode_addr_const (exp
, &value
);
3008 switch (GET_CODE (value
.base
))
3011 /* Don't hash the address of the SYMBOL_REF;
3012 only use the offset and the symbol name. */
3014 p
= XSTR (value
.base
, 0);
3015 for (i
= 0; p
[i
] != 0; i
++)
3016 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3021 + CODE_LABEL_NUMBER (LABEL_REF_LABEL (value
.base
)) * 13);
3031 case POINTER_PLUS_EXPR
:
3033 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
3034 + const_hash_1 (TREE_OPERAND (exp
, 1)));
3037 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
3040 /* A language specific constant. Just hash the code. */
3044 /* Compute hashing function. */
3046 for (i
= 0; i
< len
; i
++)
3047 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3052 /* Wrapper of compare_constant, for the htab interface. */
3054 tree_descriptor_hasher::equal (constant_descriptor_tree
*c1
,
3055 constant_descriptor_tree
*c2
)
3057 if (c1
->hash
!= c2
->hash
)
3059 return compare_constant (c1
->value
, c2
->value
);
3062 /* Compare t1 and t2, and return 1 only if they are known to result in
3063 the same bit pattern on output. */
3066 compare_constant (const tree t1
, const tree t2
)
3068 enum tree_code typecode
;
3070 if (t1
== NULL_TREE
)
3071 return t2
== NULL_TREE
;
3072 if (t2
== NULL_TREE
)
3075 if (TREE_CODE (t1
) != TREE_CODE (t2
))
3078 switch (TREE_CODE (t1
))
3081 /* Integer constants are the same only if the same width of type. */
3082 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3084 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3086 return tree_int_cst_equal (t1
, t2
);
3089 /* Real constants are the same only if the same width of type. */
3090 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3093 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
3096 /* Fixed constants are the same only if the same width of type. */
3097 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3100 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
3103 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3106 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
3107 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
3108 TREE_STRING_LENGTH (t1
)));
3111 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
3112 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
3118 if (VECTOR_CST_NELTS (t1
) != VECTOR_CST_NELTS (t2
))
3121 for (i
= 0; i
< VECTOR_CST_NELTS (t1
); ++i
)
3122 if (!compare_constant (VECTOR_CST_ELT (t1
, i
),
3123 VECTOR_CST_ELT (t2
, i
)))
3131 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
3132 unsigned HOST_WIDE_INT idx
;
3134 typecode
= TREE_CODE (TREE_TYPE (t1
));
3135 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
3138 if (typecode
== ARRAY_TYPE
)
3140 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
3141 /* For arrays, check that the sizes all match. */
3142 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
3144 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
3149 /* For record and union constructors, require exact type
3151 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
3155 v1
= CONSTRUCTOR_ELTS (t1
);
3156 v2
= CONSTRUCTOR_ELTS (t2
);
3157 if (vec_safe_length (v1
) != vec_safe_length (v2
))
3160 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
3162 constructor_elt
*c1
= &(*v1
)[idx
];
3163 constructor_elt
*c2
= &(*v2
)[idx
];
3165 /* Check that each value is the same... */
3166 if (!compare_constant (c1
->value
, c2
->value
))
3168 /* ... and that they apply to the same fields! */
3169 if (typecode
== ARRAY_TYPE
)
3171 if (!compare_constant (c1
->index
, c2
->index
))
3176 if (c1
->index
!= c2
->index
)
3187 struct addr_const value1
, value2
;
3191 decode_addr_const (t1
, &value1
);
3192 decode_addr_const (t2
, &value2
);
3194 if (value1
.offset
!= value2
.offset
)
3197 code
= GET_CODE (value1
.base
);
3198 if (code
!= GET_CODE (value2
.base
))
3204 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3208 ret
= (CODE_LABEL_NUMBER (LABEL_REF_LABEL (value1
.base
))
3209 == CODE_LABEL_NUMBER (LABEL_REF_LABEL (value2
.base
)));
3219 case POINTER_PLUS_EXPR
:
3222 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3223 && compare_constant (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3226 case VIEW_CONVERT_EXPR
:
3227 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3236 /* Return the section into which constant EXP should be placed. */
3239 get_constant_section (tree exp
, unsigned int align
)
3241 return targetm
.asm_out
.select_section (exp
,
3242 compute_reloc_for_constant (exp
),
3246 /* Return the size of constant EXP in bytes. */
3248 static HOST_WIDE_INT
3249 get_constant_size (tree exp
)
3253 size
= int_size_in_bytes (TREE_TYPE (exp
));
3254 if (TREE_CODE (exp
) == STRING_CST
)
3255 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3259 /* Subroutine of output_constant_def:
3260 No constant equal to EXP is known to have been output.
3261 Make a constant descriptor to enter EXP in the hash table.
3262 Assign the label number and construct RTL to refer to the
3263 constant's location in memory.
3264 Caller is responsible for updating the hash table. */
3266 static struct constant_descriptor_tree
*
3267 build_constant_desc (tree exp
)
3269 struct constant_descriptor_tree
*desc
;
3275 desc
= ggc_alloc
<constant_descriptor_tree
> ();
3278 /* Create a string containing the label name, in LABEL. */
3279 labelno
= const_labelno
++;
3280 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3282 /* Construct the VAR_DECL associated with the constant. */
3283 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3285 DECL_ARTIFICIAL (decl
) = 1;
3286 DECL_IGNORED_P (decl
) = 1;
3287 TREE_READONLY (decl
) = 1;
3288 TREE_STATIC (decl
) = 1;
3289 TREE_ADDRESSABLE (decl
) = 1;
3290 /* We don't set the RTL yet as this would cause varpool to assume that the
3291 variable is referenced. Moreover, it would just be dropped in LTO mode.
3292 Instead we set the flag that will be recognized in make_decl_rtl. */
3293 DECL_IN_CONSTANT_POOL (decl
) = 1;
3294 DECL_INITIAL (decl
) = desc
->value
;
3295 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3296 architectures so use DATA_ALIGNMENT as well, except for strings. */
3297 if (TREE_CODE (exp
) == STRING_CST
)
3299 #ifdef CONSTANT_ALIGNMENT
3300 DECL_ALIGN (decl
) = CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
));
3304 align_variable (decl
, 0);
3306 /* Now construct the SYMBOL_REF and the MEM. */
3307 if (use_object_blocks_p ())
3309 int align
= (TREE_CODE (decl
) == CONST_DECL
3310 || (TREE_CODE (decl
) == VAR_DECL
3311 && DECL_IN_CONSTANT_POOL (decl
))
3313 : symtab_node::get (decl
)->definition_alignment ());
3314 section
*sect
= get_constant_section (exp
, align
);
3315 symbol
= create_block_symbol (ggc_strdup (label
),
3316 get_block_for_section (sect
), -1);
3319 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3320 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3321 SET_SYMBOL_REF_DECL (symbol
, decl
);
3322 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3324 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3325 set_mem_attributes (rtl
, exp
, 1);
3326 set_mem_alias_set (rtl
, 0);
3328 /* We cannot share RTX'es in pool entries.
3329 Mark this piece of RTL as required for unsharing. */
3330 RTX_FLAG (rtl
, used
) = 1;
3332 /* Set flags or add text to the name to record information, such as
3333 that it is a local symbol. If the name is changed, the macro
3334 ASM_OUTPUT_LABELREF will have to know how to strip this
3335 information. This call might invalidate our local variable
3336 SYMBOL; we can't use it afterward. */
3337 targetm
.encode_section_info (exp
, rtl
, true);
3344 /* Return an rtx representing a reference to constant data in memory
3345 for the constant expression EXP.
3347 If assembler code for such a constant has already been output,
3348 return an rtx to refer to it.
3349 Otherwise, output such a constant in memory
3350 and generate an rtx for it.
3352 If DEFER is nonzero, this constant can be deferred and output only
3353 if referenced in the function after all optimizations.
3355 `const_desc_table' records which constants already have label strings. */
3358 output_constant_def (tree exp
, int defer
)
3360 struct constant_descriptor_tree
*desc
;
3361 struct constant_descriptor_tree key
;
3363 /* Look up EXP in the table of constant descriptors. If we didn't find
3364 it, create a new one. */
3366 key
.hash
= const_hash_1 (exp
);
3367 constant_descriptor_tree
**loc
3368 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3373 desc
= build_constant_desc (exp
);
3374 desc
->hash
= key
.hash
;
3378 maybe_output_constant_def_contents (desc
, defer
);
3382 /* Subroutine of output_constant_def: Decide whether or not we need to
3383 output the constant DESC now, and if so, do it. */
3385 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3388 rtx symbol
= XEXP (desc
->rtl
, 0);
3389 tree exp
= desc
->value
;
3391 if (flag_syntax_only
)
3394 if (TREE_ASM_WRITTEN (exp
))
3395 /* Already output; don't do it again. */
3398 /* We can always defer constants as long as the context allows
3402 /* Increment n_deferred_constants if it exists. It needs to be at
3403 least as large as the number of constants actually referred to
3404 by the function. If it's too small we'll stop looking too early
3405 and fail to emit constants; if it's too large we'll only look
3406 through the entire function when we could have stopped earlier. */
3408 n_deferred_constants
++;
3412 output_constant_def_contents (symbol
);
3415 /* Subroutine of output_constant_def_contents. Output the definition
3416 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3417 constant's alignment in bits. */
3420 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3424 size
= get_constant_size (exp
);
3426 /* Do any machine/system dependent processing of the constant. */
3427 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3429 /* Output the value of EXP. */
3430 output_constant (exp
, size
, align
);
3432 targetm
.asm_out
.decl_end ();
3435 /* We must output the constant data referred to by SYMBOL; do so. */
3438 output_constant_def_contents (rtx symbol
)
3440 tree decl
= SYMBOL_REF_DECL (symbol
);
3441 tree exp
= DECL_INITIAL (decl
);
3442 bool asan_protected
= false;
3444 /* Make sure any other constants whose addresses appear in EXP
3445 are assigned label numbers. */
3446 output_addressed_constants (exp
);
3448 /* We are no longer deferring this constant. */
3449 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3451 if ((flag_sanitize
& SANITIZE_ADDRESS
)
3452 && TREE_CODE (exp
) == STRING_CST
3453 && asan_protect_global (exp
))
3455 asan_protected
= true;
3456 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
3457 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
3460 /* If the constant is part of an object block, make sure that the
3461 decl has been positioned within its block, but do not write out
3462 its definition yet. output_object_blocks will do that later. */
3463 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3464 place_block_symbol (symbol
);
3467 int align
= (TREE_CODE (decl
) == CONST_DECL
3468 || (TREE_CODE (decl
) == VAR_DECL
3469 && DECL_IN_CONSTANT_POOL (decl
))
3471 : symtab_node::get (decl
)->definition_alignment ());
3472 switch_to_section (get_constant_section (exp
, align
));
3473 if (align
> BITS_PER_UNIT
)
3474 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3475 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3478 HOST_WIDE_INT size
= get_constant_size (exp
);
3479 assemble_zeros (asan_red_zone_size (size
));
3484 /* Look up EXP in the table of constant descriptors. Return the rtl
3485 if it has been emitted, else null. */
3488 lookup_constant_def (tree exp
)
3490 struct constant_descriptor_tree key
;
3493 key
.hash
= const_hash_1 (exp
);
3494 constant_descriptor_tree
*desc
3495 = const_desc_htab
->find_with_hash (&key
, key
.hash
);
3497 return (desc
? desc
->rtl
: NULL_RTX
);
3500 /* Return a tree representing a reference to constant data in memory
3501 for the constant expression EXP.
3503 This is the counterpart of output_constant_def at the Tree level. */
3506 tree_output_constant_def (tree exp
)
3508 struct constant_descriptor_tree
*desc
, key
;
3511 /* Look up EXP in the table of constant descriptors. If we didn't find
3512 it, create a new one. */
3514 key
.hash
= const_hash_1 (exp
);
3515 constant_descriptor_tree
**loc
3516 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3521 desc
= build_constant_desc (exp
);
3522 desc
->hash
= key
.hash
;
3526 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3527 varpool_node::finalize_decl (decl
);
3531 struct GTY((chain_next ("%h.next"), for_user
)) constant_descriptor_rtx
{
3532 struct constant_descriptor_rtx
*next
;
3536 HOST_WIDE_INT offset
;
3544 struct const_rtx_desc_hasher
: ggc_hasher
<constant_descriptor_rtx
*>
3546 static hashval_t
hash (constant_descriptor_rtx
*);
3547 static bool equal (constant_descriptor_rtx
*, constant_descriptor_rtx
*);
3550 /* Used in the hash tables to avoid outputting the same constant
3551 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3552 are output once per function, not once per file. */
3553 /* ??? Only a few targets need per-function constant pools. Most
3554 can use one per-file pool. Should add a targetm bit to tell the
3557 struct GTY(()) rtx_constant_pool
{
3558 /* Pointers to first and last constant in pool, as ordered by offset. */
3559 struct constant_descriptor_rtx
*first
;
3560 struct constant_descriptor_rtx
*last
;
3562 /* Hash facility for making memory-constants from constant rtl-expressions.
3563 It is used on RISC machines where immediate integer arguments and
3564 constant addresses are restricted so that such constants must be stored
3566 hash_table
<const_rtx_desc_hasher
> *const_rtx_htab
;
3568 /* Current offset in constant pool (does not include any
3569 machine-specific header). */
3570 HOST_WIDE_INT offset
;
3573 /* Hash and compare functions for const_rtx_htab. */
3576 const_rtx_desc_hasher::hash (constant_descriptor_rtx
*desc
)
3582 const_rtx_desc_hasher::equal (constant_descriptor_rtx
*x
,
3583 constant_descriptor_rtx
*y
)
3585 if (x
->mode
!= y
->mode
)
3587 return rtx_equal_p (x
->constant
, y
->constant
);
3590 /* Hash one component of a constant. */
3593 const_rtx_hash_1 (const_rtx x
)
3595 unsigned HOST_WIDE_INT hwi
;
3601 code
= GET_CODE (x
);
3602 mode
= GET_MODE (x
);
3603 h
= (hashval_t
) code
* 1048573 + mode
;
3612 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3613 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3615 h
^= (hashval_t
) hwi
;
3616 for (i
= 1; i
< n
; ++i
)
3619 h
^= (hashval_t
) hwi
;
3624 case CONST_WIDE_INT
:
3625 hwi
= GET_MODE_PRECISION (mode
);
3627 for (i
= 0; i
< CONST_WIDE_INT_NUNITS (x
); i
++)
3628 hwi
^= CONST_WIDE_INT_ELT (x
, i
);
3633 if (TARGET_SUPPORTS_WIDE_INT
== 0 && mode
== VOIDmode
)
3635 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3639 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3643 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3647 h
^= htab_hash_string (XSTR (x
, 0));
3651 h
= h
* 251 + CODE_LABEL_NUMBER (LABEL_REF_LABEL (x
));
3655 case UNSPEC_VOLATILE
:
3656 h
= h
* 251 + XINT (x
, 1);
3666 /* Compute a hash value for X, which should be a constant. */
3669 const_rtx_hash (rtx x
)
3672 subrtx_iterator::array_type array
;
3673 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
3674 h
= h
* 509 + const_rtx_hash_1 (*iter
);
3679 /* Create and return a new rtx constant pool. */
3681 static struct rtx_constant_pool
*
3682 create_constant_pool (void)
3684 struct rtx_constant_pool
*pool
;
3686 pool
= ggc_alloc
<rtx_constant_pool
> ();
3687 pool
->const_rtx_htab
= hash_table
<const_rtx_desc_hasher
>::create_ggc (31);
3694 /* Initialize constant pool hashing for a new function. */
3697 init_varasm_status (void)
3699 crtl
->varasm
.pool
= create_constant_pool ();
3700 crtl
->varasm
.deferred_constants
= 0;
3703 /* Given a MINUS expression, simplify it if both sides
3704 include the same symbol. */
3707 simplify_subtraction (rtx x
)
3709 rtx r
= simplify_rtx (x
);
3713 /* Given a constant rtx X, make (or find) a memory constant for its value
3714 and return a MEM rtx to refer to it in memory. */
3717 force_const_mem (machine_mode mode
, rtx x
)
3719 struct constant_descriptor_rtx
*desc
, tmp
;
3720 struct rtx_constant_pool
*pool
;
3725 constant_descriptor_rtx
**slot
;
3727 /* If we're not allowed to drop X into the constant pool, don't. */
3728 if (targetm
.cannot_force_const_mem (mode
, x
))
3731 /* Record that this function has used a constant pool entry. */
3732 crtl
->uses_const_pool
= 1;
3734 /* Decide which pool to use. */
3735 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3736 ? shared_constant_pool
3737 : crtl
->varasm
.pool
);
3739 /* Lookup the value in the hashtable. */
3742 hash
= const_rtx_hash (x
);
3743 slot
= pool
->const_rtx_htab
->find_slot_with_hash (&tmp
, hash
, INSERT
);
3746 /* If the constant was already present, return its memory. */
3748 return copy_rtx (desc
->mem
);
3750 /* Otherwise, create a new descriptor. */
3751 desc
= ggc_alloc
<constant_descriptor_rtx
> ();
3754 /* Align the location counter as required by EXP's data type. */
3755 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3756 #ifdef CONSTANT_ALIGNMENT
3758 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3759 if (type
!= NULL_TREE
)
3760 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3764 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3765 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3768 desc
->constant
= copy_rtx (tmp
.constant
);
3769 desc
->offset
= pool
->offset
;
3772 desc
->align
= align
;
3773 desc
->labelno
= const_labelno
;
3776 pool
->offset
+= GET_MODE_SIZE (mode
);
3778 pool
->last
->next
= desc
;
3780 pool
->first
= pool
->last
= desc
;
3783 /* Create a string containing the label name, in LABEL. */
3784 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3787 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3788 the constants pool. */
3789 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3791 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3792 symbol
= create_block_symbol (ggc_strdup (label
),
3793 get_block_for_section (sect
), -1);
3796 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3798 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3799 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3800 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3802 /* Construct the MEM. */
3803 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3804 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3805 set_mem_align (def
, align
);
3807 /* If we're dropping a label to the constant pool, make sure we
3809 if (GET_CODE (x
) == LABEL_REF
)
3810 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3812 return copy_rtx (def
);
3815 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3818 get_pool_constant (const_rtx addr
)
3820 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3823 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3824 and whether it has been output or not. */
3827 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3829 struct constant_descriptor_rtx
*desc
;
3831 desc
= SYMBOL_REF_CONSTANT (addr
);
3832 *pmarked
= (desc
->mark
!= 0);
3833 return desc
->constant
;
3836 /* Similar, return the mode. */
3839 get_pool_mode (const_rtx addr
)
3841 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3844 /* Return the size of the constant pool. */
3847 get_pool_size (void)
3849 return crtl
->varasm
.pool
->offset
;
3852 /* Worker function for output_constant_pool_1. Emit assembly for X
3853 in MODE with known alignment ALIGN. */
3856 output_constant_pool_2 (machine_mode mode
, rtx x
, unsigned int align
)
3858 switch (GET_MODE_CLASS (mode
))
3861 case MODE_DECIMAL_FLOAT
:
3865 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3866 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3867 assemble_real (r
, mode
, align
);
3872 case MODE_PARTIAL_INT
:
3877 case MODE_POINTER_BOUNDS
:
3878 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3881 case MODE_VECTOR_FLOAT
:
3882 case MODE_VECTOR_INT
:
3883 case MODE_VECTOR_FRACT
:
3884 case MODE_VECTOR_UFRACT
:
3885 case MODE_VECTOR_ACCUM
:
3886 case MODE_VECTOR_UACCUM
:
3889 machine_mode submode
= GET_MODE_INNER (mode
);
3890 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3892 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3893 units
= CONST_VECTOR_NUNITS (x
);
3895 for (i
= 0; i
< units
; i
++)
3897 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3898 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3908 /* Worker function for output_constant_pool. Emit constant DESC,
3909 giving it ALIGN bits of alignment. */
3912 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3919 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3920 whose CODE_LABEL has been deleted. This can occur if a jump table
3921 is eliminated by optimization. If so, write a constant of zero
3922 instead. Note that this can also happen by turning the
3923 CODE_LABEL into a NOTE. */
3924 /* ??? This seems completely and utterly wrong. Certainly it's
3925 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3926 functioning even with rtx_insn::deleted and friends. */
3929 switch (GET_CODE (tmp
))
3932 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3933 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3935 tmp
= XEXP (XEXP (tmp
, 0), 0);
3939 tmp
= LABEL_REF_LABEL (tmp
);
3940 gcc_assert (!as_a
<rtx_insn
*> (tmp
)->deleted ());
3941 gcc_assert (!NOTE_P (tmp
)
3942 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3949 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3950 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3951 align
, desc
->labelno
, done
);
3954 assemble_align (align
);
3956 /* Output the label. */
3957 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3959 /* Output the data. */
3960 output_constant_pool_2 (desc
->mode
, x
, align
);
3962 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3963 sections have proper size. */
3964 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3966 && (in_section
->common
.flags
& SECTION_MERGE
))
3967 assemble_align (align
);
3969 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3975 /* Mark all constants that are referenced by SYMBOL_REFs in X.
3976 Emit referenced deferred strings. */
3979 mark_constants_in_pattern (rtx insn
)
3981 subrtx_iterator::array_type array
;
3982 FOR_EACH_SUBRTX (iter
, array
, PATTERN (insn
), ALL
)
3984 const_rtx x
= *iter
;
3985 if (GET_CODE (x
) == SYMBOL_REF
)
3987 if (CONSTANT_POOL_ADDRESS_P (x
))
3989 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3990 if (desc
->mark
== 0)
3993 iter
.substitute (desc
->constant
);
3996 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3998 tree decl
= SYMBOL_REF_DECL (x
);
3999 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
4001 n_deferred_constants
--;
4002 output_constant_def_contents (CONST_CAST_RTX (x
));
4009 /* Look through appropriate parts of INSN, marking all entries in the
4010 constant pool which are actually being used. Entries that are only
4011 referenced by other constants are also marked as used. Emit
4012 deferred strings that are used. */
4015 mark_constants (rtx_insn
*insn
)
4020 /* Insns may appear inside a SEQUENCE. Only check the patterns of
4021 insns, not any notes that may be attached. We don't want to mark
4022 a constant just because it happens to appear in a REG_EQUIV note. */
4023 if (rtx_sequence
*seq
= dyn_cast
<rtx_sequence
*> (PATTERN (insn
)))
4025 int i
, n
= seq
->len ();
4026 for (i
= 0; i
< n
; ++i
)
4028 rtx subinsn
= seq
->element (i
);
4029 if (INSN_P (subinsn
))
4030 mark_constants_in_pattern (subinsn
);
4034 mark_constants_in_pattern (insn
);
4037 /* Look through the instructions for this function, and mark all the
4038 entries in POOL which are actually being used. Emit deferred constants
4039 which have indeed been used. */
4042 mark_constant_pool (void)
4046 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
4049 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
4050 mark_constants (insn
);
4053 /* Write all the constants in POOL. */
4056 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
4058 struct constant_descriptor_rtx
*desc
;
4060 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
4063 /* If the constant is part of an object_block, make sure that
4064 the constant has been positioned within its block, but do not
4065 write out its definition yet. output_object_blocks will do
4067 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
4068 && SYMBOL_REF_BLOCK (desc
->sym
))
4069 place_block_symbol (desc
->sym
);
4072 switch_to_section (targetm
.asm_out
.select_rtx_section
4073 (desc
->mode
, desc
->constant
, desc
->align
));
4074 output_constant_pool_1 (desc
, desc
->align
);
4079 /* Mark all constants that are used in the current function, then write
4080 out the function's private constant pool. */
4083 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
4084 tree fndecl ATTRIBUTE_UNUSED
)
4086 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
4088 /* It is possible for gcc to call force_const_mem and then to later
4089 discard the instructions which refer to the constant. In such a
4090 case we do not need to output the constant. */
4091 mark_constant_pool ();
4093 #ifdef ASM_OUTPUT_POOL_PROLOGUE
4094 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4097 output_constant_pool_contents (pool
);
4099 #ifdef ASM_OUTPUT_POOL_EPILOGUE
4100 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4104 /* Write the contents of the shared constant pool. */
4107 output_shared_constant_pool (void)
4109 output_constant_pool_contents (shared_constant_pool
);
4112 /* Determine what kind of relocations EXP may need. */
4115 compute_reloc_for_constant (tree exp
)
4117 int reloc
= 0, reloc2
;
4120 switch (TREE_CODE (exp
))
4124 /* Go inside any operations that get_inner_reference can handle and see
4125 if what's inside is a constant: no need to do anything here for
4126 addresses of variables or functions. */
4127 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4128 tem
= TREE_OPERAND (tem
, 0))
4131 if (TREE_CODE (tem
) == MEM_REF
4132 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
4134 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
4138 if (!targetm
.binds_local_p (tem
))
4145 case POINTER_PLUS_EXPR
:
4146 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4147 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4151 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4152 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4153 /* The difference of two local labels is computable at link time. */
4154 if (reloc
== 1 && reloc2
== 1)
4161 case VIEW_CONVERT_EXPR
:
4162 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4167 unsigned HOST_WIDE_INT idx
;
4168 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4170 reloc
|= compute_reloc_for_constant (tem
);
4180 /* Find all the constants whose addresses are referenced inside of EXP,
4181 and make sure assembler code with a label has been output for each one.
4182 Indicate whether an ADDR_EXPR has been encountered. */
4185 output_addressed_constants (tree exp
)
4189 switch (TREE_CODE (exp
))
4193 /* Go inside any operations that get_inner_reference can handle and see
4194 if what's inside is a constant: no need to do anything here for
4195 addresses of variables or functions. */
4196 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4197 tem
= TREE_OPERAND (tem
, 0))
4200 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4201 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4202 tem
= DECL_INITIAL (tem
);
4204 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4205 output_constant_def (tem
, 0);
4207 if (TREE_CODE (tem
) == MEM_REF
)
4208 output_addressed_constants (TREE_OPERAND (tem
, 0));
4212 case POINTER_PLUS_EXPR
:
4214 output_addressed_constants (TREE_OPERAND (exp
, 1));
4218 case VIEW_CONVERT_EXPR
:
4219 output_addressed_constants (TREE_OPERAND (exp
, 0));
4224 unsigned HOST_WIDE_INT idx
;
4225 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4227 output_addressed_constants (tem
);
4236 /* Whether a constructor CTOR is a valid static constant initializer if all
4237 its elements are. This used to be internal to initializer_constant_valid_p
4238 and has been exposed to let other functions like categorize_ctor_elements
4239 evaluate the property while walking a constructor for other purposes. */
4242 constructor_static_from_elts_p (const_tree ctor
)
4244 return (TREE_CONSTANT (ctor
)
4245 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4246 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4247 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4250 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4253 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4254 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4255 which are valid when ENDTYPE is an integer of any size; in
4256 particular, this does not accept a pointer minus a constant. This
4257 returns null_pointer_node if the VALUE is an absolute constant
4258 which can be used to initialize a static variable. Otherwise it
4262 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4266 if (!INTEGRAL_TYPE_P (endtype
))
4269 op0
= TREE_OPERAND (value
, 0);
4270 op1
= TREE_OPERAND (value
, 1);
4272 /* Like STRIP_NOPS except allow the operand mode to widen. This
4273 works around a feature of fold that simplifies (int)(p1 - p2) to
4274 ((int)p1 - (int)p2) under the theory that the narrower operation
4277 while (CONVERT_EXPR_P (op0
)
4278 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4280 tree inner
= TREE_OPERAND (op0
, 0);
4281 if (inner
== error_mark_node
4282 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4283 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4284 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4289 while (CONVERT_EXPR_P (op1
)
4290 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4292 tree inner
= TREE_OPERAND (op1
, 0);
4293 if (inner
== error_mark_node
4294 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4295 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4296 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4301 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4305 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4306 cache
? cache
+ 2 : NULL
);
4307 /* Both initializers must be known. */
4311 && (op0
== null_pointer_node
4312 || TREE_CODE (value
) == MINUS_EXPR
))
4313 return null_pointer_node
;
4315 /* Support differences between labels. */
4316 if (TREE_CODE (op0
) == LABEL_DECL
4317 && TREE_CODE (op1
) == LABEL_DECL
)
4318 return null_pointer_node
;
4320 if (TREE_CODE (op0
) == STRING_CST
4321 && TREE_CODE (op1
) == STRING_CST
4322 && operand_equal_p (op0
, op1
, 1))
4323 return null_pointer_node
;
4329 /* Helper function of initializer_constant_valid_p.
4330 Return nonzero if VALUE is a valid constant-valued expression
4331 for use in initializing a static variable; one that can be an
4332 element of a "constant" initializer.
4334 Return null_pointer_node if the value is absolute;
4335 if it is relocatable, return the variable that determines the relocation.
4336 We assume that VALUE has been folded as much as possible;
4337 therefore, we do not need to check for such things as
4338 arithmetic-combinations of integers.
4340 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4343 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4347 switch (TREE_CODE (value
))
4350 if (constructor_static_from_elts_p (value
))
4352 unsigned HOST_WIDE_INT idx
;
4354 bool absolute
= true;
4356 if (cache
&& cache
[0] == value
)
4358 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4361 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4368 cache
[1] = NULL_TREE
;
4372 if (reloc
!= null_pointer_node
)
4375 /* For a non-absolute relocation, there is no single
4376 variable that can be "the variable that determines the
4381 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4383 return absolute
? null_pointer_node
: error_mark_node
;
4386 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4394 return null_pointer_node
;
4399 tree op0
= staticp (TREE_OPERAND (value
, 0));
4402 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4403 to be a constant, this is old-skool offsetof-like nonsense. */
4404 if (TREE_CODE (op0
) == INDIRECT_REF
4405 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4406 return null_pointer_node
;
4407 /* Taking the address of a nested function involves a trampoline,
4408 unless we don't need or want one. */
4409 if (TREE_CODE (op0
) == FUNCTION_DECL
4410 && DECL_STATIC_CHAIN (op0
)
4411 && !TREE_NO_TRAMPOLINE (value
))
4413 /* "&{...}" requires a temporary to hold the constructed
4415 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4421 case NON_LVALUE_EXPR
:
4422 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4425 case VIEW_CONVERT_EXPR
:
4427 tree src
= TREE_OPERAND (value
, 0);
4428 tree src_type
= TREE_TYPE (src
);
4429 tree dest_type
= TREE_TYPE (value
);
4431 /* Allow view-conversions from aggregate to non-aggregate type only
4432 if the bit pattern is fully preserved afterwards; otherwise, the
4433 RTL expander won't be able to apply a subsequent transformation
4434 to the underlying constructor. */
4435 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4437 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4438 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4443 /* Allow all other kinds of view-conversion. */
4444 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4449 tree src
= TREE_OPERAND (value
, 0);
4450 tree src_type
= TREE_TYPE (src
);
4451 tree dest_type
= TREE_TYPE (value
);
4453 /* Allow conversions between pointer types, floating-point
4454 types, and offset types. */
4455 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4456 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4457 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4458 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4459 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4461 /* Allow length-preserving conversions between integer types. */
4462 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4463 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4464 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4466 /* Allow conversions between other integer types only if
4468 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4470 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4471 if (inner
== null_pointer_node
)
4472 return null_pointer_node
;
4476 /* Allow (int) &foo provided int is as wide as a pointer. */
4477 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4478 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4479 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4481 /* Likewise conversions from int to pointers, but also allow
4482 conversions from 0. */
4483 if ((POINTER_TYPE_P (dest_type
)
4484 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4485 && INTEGRAL_TYPE_P (src_type
))
4487 if (TREE_CODE (src
) == INTEGER_CST
4488 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4489 return null_pointer_node
;
4490 if (integer_zerop (src
))
4491 return null_pointer_node
;
4492 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4493 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4496 /* Allow conversions to struct or union types if the value
4498 if (TREE_CODE (dest_type
) == RECORD_TYPE
4499 || TREE_CODE (dest_type
) == UNION_TYPE
)
4500 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4504 case POINTER_PLUS_EXPR
:
4506 /* Any valid floating-point constants will have been folded by now;
4507 with -frounding-math we hit this with addition of two constants. */
4508 if (TREE_CODE (endtype
) == REAL_TYPE
)
4510 if (cache
&& cache
[0] == value
)
4512 if (! INTEGRAL_TYPE_P (endtype
)
4513 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4515 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4517 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4520 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4521 endtype
, ncache
+ 2);
4522 /* If either term is absolute, use the other term's relocation. */
4523 if (valid0
== null_pointer_node
)
4525 else if (valid1
== null_pointer_node
)
4527 /* Support narrowing pointer differences. */
4529 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4533 /* Support narrowing pointer differences. */
4534 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4543 if (TREE_CODE (endtype
) == REAL_TYPE
)
4545 if (cache
&& cache
[0] == value
)
4547 if (! INTEGRAL_TYPE_P (endtype
)
4548 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4550 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4552 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4555 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4556 endtype
, ncache
+ 2);
4557 /* Win if second argument is absolute. */
4558 if (valid1
== null_pointer_node
)
4560 /* Win if both arguments have the same relocation.
4561 Then the value is absolute. */
4562 else if (valid0
== valid1
&& valid0
!= 0)
4563 ret
= null_pointer_node
;
4564 /* Since GCC guarantees that string constants are unique in the
4565 generated code, a subtraction between two copies of the same
4566 constant string is absolute. */
4567 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4568 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4569 && operand_equal_p (valid0
, valid1
, 1))
4570 ret
= null_pointer_node
;
4571 /* Support narrowing differences. */
4573 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4577 /* Support narrowing differences. */
4578 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4593 /* Return nonzero if VALUE is a valid constant-valued expression
4594 for use in initializing a static variable; one that can be an
4595 element of a "constant" initializer.
4597 Return null_pointer_node if the value is absolute;
4598 if it is relocatable, return the variable that determines the relocation.
4599 We assume that VALUE has been folded as much as possible;
4600 therefore, we do not need to check for such things as
4601 arithmetic-combinations of integers. */
4603 initializer_constant_valid_p (tree value
, tree endtype
)
4605 return initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4608 /* Return true if VALUE is a valid constant-valued expression
4609 for use in initializing a static bit-field; one that can be
4610 an element of a "constant" initializer. */
4613 initializer_constant_valid_for_bitfield_p (tree value
)
4615 /* For bitfields we support integer constants or possibly nested aggregates
4617 switch (TREE_CODE (value
))
4621 unsigned HOST_WIDE_INT idx
;
4624 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4625 if (!initializer_constant_valid_for_bitfield_p (elt
))
4634 case VIEW_CONVERT_EXPR
:
4635 case NON_LVALUE_EXPR
:
4637 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4646 /* output_constructor outer state of relevance in recursive calls, typically
4647 for nested aggregate bitfields. */
4650 unsigned int bit_offset
; /* current position in ... */
4651 int byte
; /* ... the outer byte buffer. */
4654 static unsigned HOST_WIDE_INT
4655 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int,
4658 /* Output assembler code for constant EXP, with no label.
4659 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4660 Assumes output_addressed_constants has been done on EXP already.
4662 Generate at least SIZE bytes of assembler data, padding at the end
4663 with zeros if necessary. SIZE must always be specified. The returned
4664 value is the actual number of bytes of assembler data generated, which
4665 may be bigger than SIZE if the object contains a variable length field.
4667 SIZE is important for structure constructors,
4668 since trailing members may have been omitted from the constructor.
4669 It is also important for initialization of arrays from string constants
4670 since the full length of the string constant might not be wanted.
4671 It is also needed for initialization of unions, where the initializer's
4672 type is just one member, and that may not be as long as the union.
4674 There a case in which we would fail to output exactly SIZE bytes:
4675 for a structure constructor that wants to produce more than SIZE bytes.
4676 But such constructors will never be generated for any possible input.
4678 ALIGN is the alignment of the data in bits. */
4680 static unsigned HOST_WIDE_INT
4681 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4683 enum tree_code code
;
4684 unsigned HOST_WIDE_INT thissize
;
4686 if (size
== 0 || flag_syntax_only
)
4689 /* See if we're trying to initialize a pointer in a non-default mode
4690 to the address of some declaration somewhere. If the target says
4691 the mode is valid for pointers, assume the target has a way of
4693 if (TREE_CODE (exp
) == NOP_EXPR
4694 && POINTER_TYPE_P (TREE_TYPE (exp
))
4695 && targetm
.addr_space
.valid_pointer_mode
4696 (TYPE_MODE (TREE_TYPE (exp
)),
4697 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4699 tree saved_type
= TREE_TYPE (exp
);
4701 /* Peel off any intermediate conversions-to-pointer for valid
4703 while (TREE_CODE (exp
) == NOP_EXPR
4704 && POINTER_TYPE_P (TREE_TYPE (exp
))
4705 && targetm
.addr_space
.valid_pointer_mode
4706 (TYPE_MODE (TREE_TYPE (exp
)),
4707 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4708 exp
= TREE_OPERAND (exp
, 0);
4710 /* If what we're left with is the address of something, we can
4711 convert the address to the final type and output it that
4713 if (TREE_CODE (exp
) == ADDR_EXPR
)
4714 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4715 /* Likewise for constant ints. */
4716 else if (TREE_CODE (exp
) == INTEGER_CST
)
4717 exp
= wide_int_to_tree (saved_type
, exp
);
4721 /* Eliminate any conversions since we'll be outputting the underlying
4723 while (CONVERT_EXPR_P (exp
)
4724 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4725 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4727 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4728 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4730 /* Make sure eliminating the conversion is really a no-op, except with
4731 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4732 union types to allow for Ada unchecked unions. */
4733 if (type_size
> op_size
4734 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4735 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4736 /* Keep the conversion. */
4739 exp
= TREE_OPERAND (exp
, 0);
4742 code
= TREE_CODE (TREE_TYPE (exp
));
4743 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4745 /* Allow a constructor with no elements for any data type.
4746 This means to fill the space with zeros. */
4747 if (TREE_CODE (exp
) == CONSTRUCTOR
4748 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4750 assemble_zeros (size
);
4754 if (TREE_CODE (exp
) == FDESC_EXPR
)
4756 #ifdef ASM_OUTPUT_FDESC
4757 HOST_WIDE_INT part
= tree_to_shwi (TREE_OPERAND (exp
, 1));
4758 tree decl
= TREE_OPERAND (exp
, 0);
4759 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4766 /* Now output the underlying data. If we've handling the padding, return.
4767 Otherwise, break and ensure SIZE is the size written. */
4774 case REFERENCE_TYPE
:
4776 case FIXED_POINT_TYPE
:
4777 case POINTER_BOUNDS_TYPE
:
4779 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4780 EXPAND_INITIALIZER
),
4781 MIN (size
, thissize
), align
, 0))
4782 error ("initializer for integer/fixed-point value is too complicated");
4786 if (TREE_CODE (exp
) != REAL_CST
)
4787 error ("initializer for floating value is not a floating constant");
4789 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4793 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4794 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4795 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4800 switch (TREE_CODE (exp
))
4803 return output_constructor (exp
, size
, align
, NULL
);
4806 = MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
), size
);
4807 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4811 machine_mode inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4812 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4813 int elt_size
= GET_MODE_SIZE (inner
);
4814 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
);
4815 thissize
= elt_size
;
4816 for (unsigned int i
= 1; i
< VECTOR_CST_NELTS (exp
); i
++)
4818 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
);
4819 thissize
+= elt_size
;
4830 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4831 return output_constructor (exp
, size
, align
, NULL
);
4840 if (size
> thissize
)
4841 assemble_zeros (size
- thissize
);
4847 /* Subroutine of output_constructor, used for computing the size of
4848 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4849 type with an unspecified upper bound. */
4851 static unsigned HOST_WIDE_INT
4852 array_size_for_constructor (tree val
)
4855 unsigned HOST_WIDE_INT cnt
;
4856 tree index
, value
, tmp
;
4859 /* This code used to attempt to handle string constants that are not
4860 arrays of single-bytes, but nothing else does, so there's no point in
4862 if (TREE_CODE (val
) == STRING_CST
)
4863 return TREE_STRING_LENGTH (val
);
4865 max_index
= NULL_TREE
;
4866 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4868 if (TREE_CODE (index
) == RANGE_EXPR
)
4869 index
= TREE_OPERAND (index
, 1);
4870 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4874 if (max_index
== NULL_TREE
)
4877 /* Compute the total number of array elements. */
4878 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4879 i
= wi::to_offset (max_index
) - wi::to_offset (tmp
) + 1;
4881 /* Multiply by the array element unit size to find number of bytes. */
4882 i
*= wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4884 gcc_assert (wi::fits_uhwi_p (i
));
4885 return i
.to_uhwi ();
4888 /* Other datastructures + helpers for output_constructor. */
4890 /* output_constructor local state to support interaction with helpers. */
4894 /* Received arguments. */
4895 tree exp
; /* Constructor expression. */
4896 tree type
; /* Type of constructor expression. */
4897 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4898 unsigned int align
; /* Known initial alignment. */
4899 tree min_index
; /* Lower bound if specified for an array. */
4901 /* Output processing state. */
4902 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4903 int byte
; /* Part of a bitfield byte yet to be output. */
4904 int last_relative_index
; /* Implicit or explicit index of the last
4905 array element output within a bitfield. */
4906 bool byte_buffer_in_use
; /* Whether BYTE is in use. */
4908 /* Current element. */
4909 tree field
; /* Current field decl in a record. */
4910 tree val
; /* Current element value. */
4911 tree index
; /* Current element index. */
4915 /* Helper for output_constructor. From the current LOCAL state, output a
4916 RANGE_EXPR element. */
4919 output_constructor_array_range (oc_local_state
*local
)
4921 unsigned HOST_WIDE_INT fieldsize
4922 = int_size_in_bytes (TREE_TYPE (local
->type
));
4924 HOST_WIDE_INT lo_index
4925 = tree_to_shwi (TREE_OPERAND (local
->index
, 0));
4926 HOST_WIDE_INT hi_index
4927 = tree_to_shwi (TREE_OPERAND (local
->index
, 1));
4928 HOST_WIDE_INT index
;
4931 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4933 for (index
= lo_index
; index
<= hi_index
; index
++)
4935 /* Output the element's initial value. */
4936 if (local
->val
== NULL_TREE
)
4937 assemble_zeros (fieldsize
);
4939 fieldsize
= output_constant (local
->val
, fieldsize
, align2
);
4941 /* Count its size. */
4942 local
->total_bytes
+= fieldsize
;
4946 /* Helper for output_constructor. From the current LOCAL state, output a
4947 field element that is not true bitfield or part of an outer one. */
4950 output_constructor_regular_field (oc_local_state
*local
)
4952 /* Field size and position. Since this structure is static, we know the
4953 positions are constant. */
4954 unsigned HOST_WIDE_INT fieldsize
;
4955 HOST_WIDE_INT fieldpos
;
4957 unsigned int align2
;
4959 if (local
->index
!= NULL_TREE
)
4961 /* Perform the index calculation in modulo arithmetic but
4962 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4963 but we are using an unsigned sizetype. */
4964 unsigned prec
= TYPE_PRECISION (sizetype
);
4965 offset_int idx
= wi::sext (wi::to_offset (local
->index
)
4966 - wi::to_offset (local
->min_index
), prec
);
4967 fieldpos
= (idx
* wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
))))
4970 else if (local
->field
!= NULL_TREE
)
4971 fieldpos
= int_byte_position (local
->field
);
4975 /* Output any buffered-up bit-fields preceding this element. */
4976 if (local
->byte_buffer_in_use
)
4978 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4979 local
->total_bytes
++;
4980 local
->byte_buffer_in_use
= false;
4983 /* Advance to offset of this element.
4984 Note no alignment needed in an array, since that is guaranteed
4985 if each element has the proper size. */
4986 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4987 && fieldpos
> local
->total_bytes
)
4989 assemble_zeros (fieldpos
- local
->total_bytes
);
4990 local
->total_bytes
= fieldpos
;
4993 /* Find the alignment of this element. */
4994 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
4996 /* Determine size this element should occupy. */
5001 /* If this is an array with an unspecified upper bound,
5002 the initializer determines the size. */
5003 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
5004 but we cannot do this until the deprecated support for
5005 initializing zero-length array members is removed. */
5006 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
5007 && TYPE_DOMAIN (TREE_TYPE (local
->field
))
5008 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
))))
5010 fieldsize
= array_size_for_constructor (local
->val
);
5011 /* Given a non-empty initialization, this field had
5013 gcc_assert (!fieldsize
|| !DECL_CHAIN (local
->field
));
5016 fieldsize
= tree_to_uhwi (DECL_SIZE_UNIT (local
->field
));
5019 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
5021 /* Output the element's initial value. */
5022 if (local
->val
== NULL_TREE
)
5023 assemble_zeros (fieldsize
);
5025 fieldsize
= output_constant (local
->val
, fieldsize
, align2
);
5027 /* Count its size. */
5028 local
->total_bytes
+= fieldsize
;
5031 /* Helper for output_constructor. From the LOCAL state, output an element
5032 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
5033 from the start of a possibly ongoing outer byte buffer. */
5036 output_constructor_bitfield (oc_local_state
*local
, unsigned int bit_offset
)
5038 /* Bit size of this element. */
5039 HOST_WIDE_INT ebitsize
5041 ? tree_to_uhwi (DECL_SIZE (local
->field
))
5042 : tree_to_uhwi (TYPE_SIZE (TREE_TYPE (local
->type
))));
5044 /* Relative index of this element if this is an array component. */
5045 HOST_WIDE_INT relative_index
5048 ? (tree_to_shwi (local
->index
)
5049 - tree_to_shwi (local
->min_index
))
5050 : local
->last_relative_index
+ 1)
5053 /* Bit position of this element from the start of the containing
5055 HOST_WIDE_INT constructor_relative_ebitpos
5057 ? int_bit_position (local
->field
)
5058 : ebitsize
* relative_index
);
5060 /* Bit position of this element from the start of a possibly ongoing
5061 outer byte buffer. */
5062 HOST_WIDE_INT byte_relative_ebitpos
5063 = bit_offset
+ constructor_relative_ebitpos
;
5065 /* From the start of a possibly ongoing outer byte buffer, offsets to
5066 the first bit of this element and to the first bit past the end of
5068 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
5069 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
5071 local
->last_relative_index
= relative_index
;
5073 if (local
->val
== NULL_TREE
)
5074 local
->val
= integer_zero_node
;
5076 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
5077 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
5078 local
->val
= TREE_OPERAND (local
->val
, 0);
5080 if (TREE_CODE (local
->val
) != INTEGER_CST
5081 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
5083 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
5087 /* If this field does not start in this (or next) byte, skip some bytes. */
5088 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5090 /* Output remnant of any bit field in previous bytes. */
5091 if (local
->byte_buffer_in_use
)
5093 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5094 local
->total_bytes
++;
5095 local
->byte_buffer_in_use
= false;
5098 /* If still not at proper byte, advance to there. */
5099 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5101 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
5102 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
5103 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
5107 /* Set up the buffer if necessary. */
5108 if (!local
->byte_buffer_in_use
)
5112 local
->byte_buffer_in_use
= true;
5115 /* If this is nested constructor, recurse passing the bit offset and the
5116 pending data, then retrieve the new pending data afterwards. */
5117 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
5119 oc_outer_state temp_state
;
5120 temp_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
5121 temp_state
.byte
= local
->byte
;
5123 += output_constructor (local
->val
, 0, 0, &temp_state
);
5124 local
->byte
= temp_state
.byte
;
5128 /* Otherwise, we must split the element into pieces that fall within
5129 separate bytes, and combine each byte with previous or following
5131 while (next_offset
< end_offset
)
5135 HOST_WIDE_INT value
;
5136 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
5137 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
5139 /* Advance from byte to byte within this element when necessary. */
5140 while (next_byte
!= local
->total_bytes
)
5142 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5143 local
->total_bytes
++;
5147 /* Number of bits we can process at once (all part of the same byte). */
5148 this_time
= MIN (end_offset
- next_offset
, BITS_PER_UNIT
- next_bit
);
5149 if (BYTES_BIG_ENDIAN
)
5151 /* On big-endian machine, take the most significant bits (of the
5152 bits that are significant) first and put them into bytes from
5153 the most significant end. */
5154 shift
= end_offset
- next_offset
- this_time
;
5156 /* Don't try to take a bunch of bits that cross
5157 the word boundary in the INTEGER_CST. We can
5158 only select bits from one element. */
5159 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5160 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5162 const int end
= shift
+ this_time
- 1;
5163 shift
= end
& -HOST_BITS_PER_WIDE_INT
;
5164 this_time
= end
- shift
+ 1;
5167 /* Now get the bits from the appropriate constant word. */
5168 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5169 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5171 /* Get the result. This works only when:
5172 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5173 local
->byte
|= (((value
>> shift
)
5174 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5175 << (BITS_PER_UNIT
- this_time
- next_bit
));
5179 /* On little-endian machines, take the least significant bits of
5180 the value first and pack them starting at the least significant
5181 bits of the bytes. */
5182 shift
= next_offset
- byte_relative_ebitpos
;
5184 /* Don't try to take a bunch of bits that cross
5185 the word boundary in the INTEGER_CST. We can
5186 only select bits from one element. */
5187 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5188 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5190 = HOST_BITS_PER_WIDE_INT
- (shift
& (HOST_BITS_PER_WIDE_INT
- 1));
5192 /* Now get the bits from the appropriate constant word. */
5193 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5194 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5196 /* Get the result. This works only when:
5197 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5198 local
->byte
|= (((value
>> shift
)
5199 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5203 next_offset
+= this_time
;
5204 local
->byte_buffer_in_use
= true;
5208 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5209 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5210 caller output state of relevance in recursive invocations. */
5212 static unsigned HOST_WIDE_INT
5213 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
5214 unsigned int align
, oc_outer_state
*outer
)
5216 unsigned HOST_WIDE_INT cnt
;
5217 constructor_elt
*ce
;
5219 oc_local_state local
;
5221 /* Setup our local state to communicate with helpers. */
5223 local
.type
= TREE_TYPE (exp
);
5225 local
.align
= align
;
5226 if (TREE_CODE (local
.type
) == ARRAY_TYPE
&& TYPE_DOMAIN (local
.type
))
5227 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5229 local
.min_index
= NULL_TREE
;
5231 local
.total_bytes
= 0;
5232 local
.byte_buffer_in_use
= outer
!= NULL
;
5233 local
.byte
= outer
? outer
->byte
: 0;
5234 local
.last_relative_index
= -1;
5236 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5238 /* As CE goes through the elements of the constant, FIELD goes through the
5239 structure fields if the constant is a structure. If the constant is a
5240 union, we override this by getting the field from the TREE_LIST element.
5241 But the constant could also be an array. Then FIELD is zero.
5243 There is always a maximum of one element in the chain LINK for unions
5244 (even if the initializer in a source program incorrectly contains
5247 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5248 local
.field
= TYPE_FIELDS (local
.type
);
5250 local
.field
= NULL_TREE
;
5253 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5254 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5256 local
.val
= ce
->value
;
5257 local
.index
= NULL_TREE
;
5259 /* The element in a union constructor specifies the proper field
5261 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5262 local
.field
= ce
->index
;
5264 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5265 local
.index
= ce
->index
;
5267 if (local
.field
&& flag_verbose_asm
)
5268 fprintf (asm_out_file
, "%s %s:\n",
5270 DECL_NAME (local
.field
)
5271 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5274 /* Eliminate the marker that makes a cast not be an lvalue. */
5275 if (local
.val
!= NULL_TREE
)
5276 STRIP_NOPS (local
.val
);
5278 /* Output the current element, using the appropriate helper ... */
5280 /* For an array slice not part of an outer bitfield. */
5282 && local
.index
!= NULL_TREE
5283 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5284 output_constructor_array_range (&local
);
5286 /* For a field that is neither a true bitfield nor part of an outer one,
5287 known to be at least byte aligned and multiple-of-bytes long. */
5289 && (local
.field
== NULL_TREE
5290 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5291 output_constructor_regular_field (&local
);
5293 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5294 supported for scalar fields, so we may need to convert first. */
5297 if (TREE_CODE (local
.val
) == REAL_CST
)
5299 = fold_unary (VIEW_CONVERT_EXPR
,
5300 build_nonstandard_integer_type
5301 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5303 output_constructor_bitfield (&local
, outer
? outer
->bit_offset
: 0);
5307 /* If we are not at toplevel, save the pending data for our caller.
5308 Otherwise output the pending data and padding zeros as needed. */
5310 outer
->byte
= local
.byte
;
5313 if (local
.byte_buffer_in_use
)
5315 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5316 local
.total_bytes
++;
5319 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5321 assemble_zeros (local
.size
- local
.total_bytes
);
5322 local
.total_bytes
= local
.size
;
5326 return local
.total_bytes
;
5329 /* Mark DECL as weak. */
5332 mark_weak (tree decl
)
5334 if (DECL_WEAK (decl
))
5337 struct symtab_node
*n
= symtab_node::get (decl
);
5338 if (n
&& n
->refuse_visibility_changes
)
5339 error ("%+D declared weak after being used", decl
);
5340 DECL_WEAK (decl
) = 1;
5342 if (DECL_RTL_SET_P (decl
)
5343 && MEM_P (DECL_RTL (decl
))
5344 && XEXP (DECL_RTL (decl
), 0)
5345 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5346 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5349 /* Merge weak status between NEWDECL and OLDDECL. */
5352 merge_weak (tree newdecl
, tree olddecl
)
5354 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5356 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5359 /* We put the NEWDECL on the weak_decls list at some point
5360 and OLDDECL as well. Keep just OLDDECL on the list. */
5361 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5362 if (TREE_VALUE (*pwd
) == newdecl
)
5364 *pwd
= TREE_CHAIN (*pwd
);
5371 if (DECL_WEAK (newdecl
))
5375 /* NEWDECL is weak, but OLDDECL is not. */
5377 /* If we already output the OLDDECL, we're in trouble; we can't
5378 go back and make it weak. This should never happen in
5379 unit-at-a-time compilation. */
5380 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5382 /* If we've already generated rtl referencing OLDDECL, we may
5383 have done so in a way that will not function properly with
5384 a weak symbol. Again in unit-at-a-time this should be
5386 gcc_assert (!TREE_USED (olddecl
)
5387 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5389 if (TARGET_SUPPORTS_WEAK
)
5391 /* We put the NEWDECL on the weak_decls list at some point.
5392 Replace it with the OLDDECL. */
5393 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5394 if (TREE_VALUE (wd
) == newdecl
)
5396 TREE_VALUE (wd
) = olddecl
;
5399 /* We may not find the entry on the list. If NEWDECL is a
5400 weak alias, then we will have already called
5401 globalize_decl to remove the entry; in that case, we do
5402 not need to do anything. */
5405 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5406 mark_weak (olddecl
);
5409 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5410 weak. Just update NEWDECL to indicate that it's weak too. */
5411 mark_weak (newdecl
);
5414 /* Declare DECL to be a weak symbol. */
5417 declare_weak (tree decl
)
5419 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5420 if (! TREE_PUBLIC (decl
))
5421 error ("weak declaration of %q+D must be public", decl
);
5422 else if (!TARGET_SUPPORTS_WEAK
)
5423 warning (0, "weak declaration of %q+D not supported", decl
);
5426 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5427 DECL_ATTRIBUTES (decl
)
5428 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5432 weak_finish_1 (tree decl
)
5434 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5435 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5438 if (! TREE_USED (decl
))
5441 #ifdef ASM_WEAKEN_DECL
5442 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5444 #ifdef ASM_WEAKEN_LABEL
5445 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5447 #ifdef ASM_OUTPUT_WEAK_ALIAS
5449 static bool warn_once
= 0;
5452 warning (0, "only weak aliases are supported in this configuration");
5462 /* Fiven an assembly name, find the decl it is associated with. */
5464 find_decl (tree target
)
5466 symtab_node
*node
= symtab_node::get_for_asmname (target
);
5472 /* This TREE_LIST contains weakref targets. */
5474 static GTY(()) tree weakref_targets
;
5476 /* Emit any pending weak declarations. */
5483 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5485 tree alias_decl
= TREE_PURPOSE (t
);
5486 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5488 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5489 /* Remove alias_decl from the weak list, but leave entries for
5490 the target alone. */
5492 #ifndef ASM_OUTPUT_WEAKREF
5493 else if (! TREE_SYMBOL_REFERENCED (target
))
5495 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5496 defined, otherwise we and weak_finish_1 would use
5497 different macros. */
5498 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5499 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5501 tree decl
= find_decl (target
);
5505 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5506 TREE_CODE (alias_decl
), target
,
5507 TREE_TYPE (alias_decl
));
5509 DECL_EXTERNAL (decl
) = 1;
5510 TREE_PUBLIC (decl
) = 1;
5511 DECL_ARTIFICIAL (decl
) = 1;
5512 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5513 TREE_USED (decl
) = 1;
5516 weak_finish_1 (decl
);
5525 /* Remove the alias and the target from the pending weak list
5526 so that we do not emit any .weak directives for the former,
5527 nor multiple .weak directives for the latter. */
5528 for (p
= &weak_decls
; (t2
= *p
) ; )
5530 if (TREE_VALUE (t2
) == alias_decl
5531 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5532 *p
= TREE_CHAIN (t2
);
5534 p
= &TREE_CHAIN (t2
);
5537 /* Remove other weakrefs to the same target, to speed things up. */
5538 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5540 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5541 *p
= TREE_CHAIN (t2
);
5543 p
= &TREE_CHAIN (t2
);
5548 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5550 tree decl
= TREE_VALUE (t
);
5552 weak_finish_1 (decl
);
5556 /* Emit the assembly bits to indicate that DECL is globally visible. */
5559 globalize_decl (tree decl
)
5562 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5563 if (DECL_WEAK (decl
))
5565 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5568 #ifdef ASM_WEAKEN_DECL
5569 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5571 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5574 /* Remove this function from the pending weak list so that
5575 we do not emit multiple .weak directives for it. */
5576 for (p
= &weak_decls
; (t
= *p
) ; )
5578 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5579 *p
= TREE_CHAIN (t
);
5581 p
= &TREE_CHAIN (t
);
5584 /* Remove weakrefs to the same target from the pending weakref
5585 list, for the same reason. */
5586 for (p
= &weakref_targets
; (t
= *p
) ; )
5588 if (DECL_ASSEMBLER_NAME (decl
)
5589 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5590 *p
= TREE_CHAIN (t
);
5592 p
= &TREE_CHAIN (t
);
5599 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5602 vec
<alias_pair
, va_gc
> *alias_pairs
;
5604 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5605 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5606 tree node is DECL to have the value of the tree node TARGET. */
5609 do_assemble_alias (tree decl
, tree target
)
5613 /* Emulated TLS had better not get this var. */
5614 gcc_assert (!(!targetm
.have_tls
5615 && TREE_CODE (decl
) == VAR_DECL
5616 && DECL_THREAD_LOCAL_P (decl
)));
5618 if (TREE_ASM_WRITTEN (decl
))
5621 id
= DECL_ASSEMBLER_NAME (decl
);
5622 ultimate_transparent_alias_target (&id
);
5623 ultimate_transparent_alias_target (&target
);
5625 /* We must force creation of DECL_RTL for debug info generation, even though
5626 we don't use it here. */
5627 make_decl_rtl (decl
);
5629 TREE_ASM_WRITTEN (decl
) = 1;
5630 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5631 TREE_ASM_WRITTEN (id
) = 1;
5633 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5635 if (!TREE_SYMBOL_REFERENCED (target
))
5636 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5638 #ifdef ASM_OUTPUT_WEAKREF
5639 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5640 IDENTIFIER_POINTER (id
),
5641 IDENTIFIER_POINTER (target
));
5643 if (!TARGET_SUPPORTS_WEAK
)
5645 error_at (DECL_SOURCE_LOCATION (decl
),
5646 "weakref is not supported in this configuration");
5653 #ifdef ASM_OUTPUT_DEF
5654 tree orig_decl
= decl
;
5656 if (TREE_CODE (decl
) == FUNCTION_DECL
5657 && cgraph_node::get (decl
)->instrumentation_clone
5658 && cgraph_node::get (decl
)->instrumented_version
)
5659 orig_decl
= cgraph_node::get (decl
)->instrumented_version
->decl
;
5661 /* Make name accessible from other files, if appropriate. */
5663 if (TREE_PUBLIC (decl
) || TREE_PUBLIC (orig_decl
))
5665 globalize_decl (decl
);
5666 maybe_assemble_visibility (decl
);
5668 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5670 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5671 if (targetm
.has_ifunc_p ())
5672 ASM_OUTPUT_TYPE_DIRECTIVE
5673 (asm_out_file
, IDENTIFIER_POINTER (id
),
5677 error_at (DECL_SOURCE_LOCATION (decl
),
5678 "ifunc is not supported on this target");
5681 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5682 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5684 ASM_OUTPUT_DEF (asm_out_file
,
5685 IDENTIFIER_POINTER (id
),
5686 IDENTIFIER_POINTER (target
));
5688 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5693 name
= IDENTIFIER_POINTER (id
);
5694 # ifdef ASM_WEAKEN_DECL
5695 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5697 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5699 /* Remove this function from the pending weak list so that
5700 we do not emit multiple .weak directives for it. */
5701 for (p
= &weak_decls
; (t
= *p
) ; )
5702 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
))
5703 || id
== DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5704 *p
= TREE_CHAIN (t
);
5706 p
= &TREE_CHAIN (t
);
5708 /* Remove weakrefs to the same target from the pending weakref
5709 list, for the same reason. */
5710 for (p
= &weakref_targets
; (t
= *p
) ; )
5712 if (id
== ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5713 *p
= TREE_CHAIN (t
);
5715 p
= &TREE_CHAIN (t
);
5721 /* Emit an assembler directive to make the symbol for DECL an alias to
5722 the symbol for TARGET. */
5725 assemble_alias (tree decl
, tree target
)
5729 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5731 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5733 ultimate_transparent_alias_target (&target
);
5735 if (alias
== target
)
5736 error ("weakref %q+D ultimately targets itself", decl
);
5737 if (TREE_PUBLIC (decl
))
5738 error ("weakref %q+D must have static linkage", decl
);
5742 #if !defined (ASM_OUTPUT_DEF)
5743 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5744 error_at (DECL_SOURCE_LOCATION (decl
),
5745 "alias definitions not supported in this configuration");
5746 TREE_ASM_WRITTEN (decl
) = 1;
5749 if (!DECL_WEAK (decl
))
5751 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5752 error_at (DECL_SOURCE_LOCATION (decl
),
5753 "ifunc is not supported in this configuration");
5755 error_at (DECL_SOURCE_LOCATION (decl
),
5756 "only weak aliases are supported in this configuration");
5757 TREE_ASM_WRITTEN (decl
) = 1;
5763 TREE_USED (decl
) = 1;
5765 /* Allow aliases to aliases. */
5766 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5767 cgraph_node::get_create (decl
)->alias
= true;
5769 varpool_node::get_create (decl
)->alias
= true;
5771 /* If the target has already been emitted, we don't have to queue the
5772 alias. This saves a tad of memory. */
5773 if (symtab
->global_info_ready
)
5774 target_decl
= find_decl (target
);
5777 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5778 || symtab
->state
>= EXPANSION
)
5779 do_assemble_alias (decl
, target
);
5782 alias_pair p
= {decl
, target
};
5783 vec_safe_push (alias_pairs
, p
);
5787 /* Record and output a table of translations from original function
5788 to its transaction aware clone. Note that tm_pure functions are
5789 considered to be their own clone. */
5791 struct tm_clone_hasher
: ggc_cache_hasher
<tree_map
*>
5793 static hashval_t
hash (tree_map
*m
) { return tree_map_hash (m
); }
5794 static bool equal (tree_map
*a
, tree_map
*b
) { return tree_map_eq (a
, b
); }
5796 static void handle_cache_entry (tree_map
*&e
)
5798 if (e
!= HTAB_EMPTY_ENTRY
|| e
!= HTAB_DELETED_ENTRY
)
5800 extern void gt_ggc_mx (tree_map
*&);
5801 if (ggc_marked_p (e
->base
.from
))
5804 e
= static_cast<tree_map
*> (HTAB_DELETED_ENTRY
);
5810 hash_table
<tm_clone_hasher
> *tm_clone_hash
;
5813 record_tm_clone_pair (tree o
, tree n
)
5815 struct tree_map
**slot
, *h
;
5817 if (tm_clone_hash
== NULL
)
5818 tm_clone_hash
= hash_table
<tm_clone_hasher
>::create_ggc (32);
5820 h
= ggc_alloc
<tree_map
> ();
5821 h
->hash
= htab_hash_pointer (o
);
5825 slot
= tm_clone_hash
->find_slot_with_hash (h
, h
->hash
, INSERT
);
5830 get_tm_clone_pair (tree o
)
5834 struct tree_map
*h
, in
;
5837 in
.hash
= htab_hash_pointer (o
);
5838 h
= tm_clone_hash
->find_with_hash (&in
, in
.hash
);
5845 typedef struct tm_alias_pair
5853 /* Dump the actual pairs to the .tm_clone_table section. */
5856 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5860 bool switched
= false;
5862 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5866 struct cgraph_node
*src_n
= cgraph_node::get (src
);
5867 struct cgraph_node
*dst_n
= cgraph_node::get (dst
);
5869 /* The function ipa_tm_create_version() marks the clone as needed if
5870 the original function was needed. But we also mark the clone as
5871 needed if we ever called the clone indirectly through
5872 TM_GETTMCLONE. If neither of these are true, we didn't generate
5873 a clone, and we didn't call it indirectly... no sense keeping it
5874 in the clone table. */
5875 if (!dst_n
|| !dst_n
->definition
)
5878 /* This covers the case where we have optimized the original
5879 function away, and only access the transactional clone. */
5880 if (!src_n
|| !src_n
->definition
)
5885 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5886 assemble_align (POINTER_SIZE
);
5890 assemble_integer (XEXP (DECL_RTL (src
), 0),
5891 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
5892 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5893 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
5897 /* Provide a default for the tm_clone_table section. */
5900 default_clone_table_section (void)
5902 return get_named_section (NULL
, ".tm_clone_table", 3);
5905 /* Helper comparison function for qsorting by the DECL_UID stored in
5906 alias_pair->emitted_diags. */
5909 tm_alias_pair_cmp (const void *x
, const void *y
)
5911 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5912 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5913 if (p1
->uid
< p2
->uid
)
5915 if (p1
->uid
> p2
->uid
)
5921 finish_tm_clone_pairs (void)
5923 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5925 if (tm_clone_hash
== NULL
)
5928 /* We need a determenistic order for the .tm_clone_table, otherwise
5929 we will get bootstrap comparison failures, so dump the hash table
5930 to a vector, sort it, and dump the vector. */
5932 /* Dump the hashtable to a vector. */
5934 hash_table
<tm_clone_hasher
>::iterator iter
;
5935 FOR_EACH_HASH_TABLE_ELEMENT (*tm_clone_hash
, map
, tree_map
*, iter
)
5937 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5938 tm_alias_pairs
.safe_push (p
);
5941 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5944 dump_tm_clone_pairs (tm_alias_pairs
);
5946 tm_clone_hash
->empty ();
5947 tm_clone_hash
= NULL
;
5948 tm_alias_pairs
.release ();
5952 /* Emit an assembler directive to set symbol for DECL visibility to
5953 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5956 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5957 int vis ATTRIBUTE_UNUSED
)
5959 #ifdef HAVE_GAS_HIDDEN
5960 static const char * const visibility_types
[] = {
5961 NULL
, "protected", "hidden", "internal"
5964 const char *name
, *type
;
5967 id
= DECL_ASSEMBLER_NAME (decl
);
5968 ultimate_transparent_alias_target (&id
);
5969 name
= IDENTIFIER_POINTER (id
);
5971 type
= visibility_types
[vis
];
5973 fprintf (asm_out_file
, "\t.%s\t", type
);
5974 assemble_name (asm_out_file
, name
);
5975 fprintf (asm_out_file
, "\n");
5977 if (!DECL_ARTIFICIAL (decl
))
5978 warning (OPT_Wattributes
, "visibility attribute not supported "
5979 "in this configuration; ignored");
5983 /* A helper function to call assemble_visibility when needed for a decl. */
5986 maybe_assemble_visibility (tree decl
)
5988 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5990 if (TREE_CODE (decl
) == FUNCTION_DECL
5991 && cgraph_node::get (decl
)
5992 && cgraph_node::get (decl
)->instrumentation_clone
5993 && cgraph_node::get (decl
)->instrumented_version
)
5994 vis
= DECL_VISIBILITY (cgraph_node::get (decl
)->instrumented_version
->decl
);
5996 if (vis
!= VISIBILITY_DEFAULT
)
5998 targetm
.asm_out
.assemble_visibility (decl
, vis
);
6005 /* Returns 1 if the target configuration supports defining public symbols
6006 so that one of them will be chosen at link time instead of generating a
6007 multiply-defined symbol error, whether through the use of weak symbols or
6008 a target-specific mechanism for having duplicates discarded. */
6011 supports_one_only (void)
6013 if (SUPPORTS_ONE_ONLY
)
6015 return TARGET_SUPPORTS_WEAK
;
6018 /* Set up DECL as a public symbol that can be defined in multiple
6019 translation units without generating a linker error. */
6022 make_decl_one_only (tree decl
, tree comdat_group
)
6024 struct symtab_node
*symbol
;
6025 gcc_assert (TREE_CODE (decl
) == VAR_DECL
6026 || TREE_CODE (decl
) == FUNCTION_DECL
);
6028 TREE_PUBLIC (decl
) = 1;
6030 if (TREE_CODE (decl
) == VAR_DECL
)
6031 symbol
= varpool_node::get_create (decl
);
6033 symbol
= cgraph_node::get_create (decl
);
6035 if (SUPPORTS_ONE_ONLY
)
6037 #ifdef MAKE_DECL_ONE_ONLY
6038 MAKE_DECL_ONE_ONLY (decl
);
6040 symbol
->set_comdat_group (comdat_group
);
6042 else if (TREE_CODE (decl
) == VAR_DECL
6043 && (DECL_INITIAL (decl
) == 0
6044 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6045 DECL_COMMON (decl
) = 1;
6048 gcc_assert (TARGET_SUPPORTS_WEAK
);
6049 DECL_WEAK (decl
) = 1;
6054 init_varasm_once (void)
6056 section_htab
= hash_table
<section_hasher
>::create_ggc (31);
6057 object_block_htab
= hash_table
<object_block_hasher
>::create_ggc (31);
6058 const_desc_htab
= hash_table
<tree_descriptor_hasher
>::create_ggc (1009);
6060 shared_constant_pool
= create_constant_pool ();
6062 #ifdef TEXT_SECTION_ASM_OP
6063 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
6064 TEXT_SECTION_ASM_OP
);
6067 #ifdef DATA_SECTION_ASM_OP
6068 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6069 DATA_SECTION_ASM_OP
);
6072 #ifdef SDATA_SECTION_ASM_OP
6073 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6074 SDATA_SECTION_ASM_OP
);
6077 #ifdef READONLY_DATA_SECTION_ASM_OP
6078 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
6079 READONLY_DATA_SECTION_ASM_OP
);
6082 #ifdef CTORS_SECTION_ASM_OP
6083 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
6084 CTORS_SECTION_ASM_OP
);
6087 #ifdef DTORS_SECTION_ASM_OP
6088 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
6089 DTORS_SECTION_ASM_OP
);
6092 #ifdef BSS_SECTION_ASM_OP
6093 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6094 output_section_asm_op
,
6095 BSS_SECTION_ASM_OP
);
6098 #ifdef SBSS_SECTION_ASM_OP
6099 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6100 output_section_asm_op
,
6101 SBSS_SECTION_ASM_OP
);
6104 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6105 | SECTION_COMMON
, emit_tls_common
);
6106 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6107 | SECTION_COMMON
, emit_local
);
6108 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6109 | SECTION_COMMON
, emit_common
);
6111 #if defined ASM_OUTPUT_ALIGNED_BSS
6112 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
6116 targetm
.asm_out
.init_sections ();
6118 if (readonly_data_section
== NULL
)
6119 readonly_data_section
= text_section
;
6121 #ifdef ASM_OUTPUT_EXTERNAL
6122 pending_assemble_externals_set
= new hash_set
<tree
>;
6127 decl_default_tls_model (const_tree decl
)
6129 enum tls_model kind
;
6132 is_local
= targetm
.binds_local_p (decl
);
6136 kind
= TLS_MODEL_LOCAL_EXEC
;
6138 kind
= TLS_MODEL_INITIAL_EXEC
;
6141 /* Local dynamic is inefficient when we're not combining the
6142 parts of the address. */
6143 else if (optimize
&& is_local
)
6144 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
6146 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
6147 if (kind
< flag_tls_default
)
6148 kind
= flag_tls_default
;
6153 /* Select a set of attributes for section NAME based on the properties
6154 of DECL and whether or not RELOC indicates that DECL's initializer
6155 might contain runtime relocations.
6157 We make the section read-only and executable for a function decl,
6158 read-only for a const data decl, and writable for a non-const data decl. */
6161 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6165 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6166 flags
= SECTION_CODE
;
6169 enum section_category category
6170 = categorize_decl_for_section (decl
, reloc
);
6171 if (decl_readonly_section_1 (category
))
6173 else if (category
== SECCAT_DATA_REL_RO
6174 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6175 flags
= SECTION_WRITE
| SECTION_RELRO
;
6177 flags
= SECTION_WRITE
;
6181 flags
= SECTION_WRITE
;
6182 if (strcmp (name
, ".data.rel.ro") == 0
6183 || strcmp (name
, ".data.rel.ro.local") == 0)
6184 flags
|= SECTION_RELRO
;
6187 if (decl
&& DECL_P (decl
) && DECL_COMDAT_GROUP (decl
))
6188 flags
|= SECTION_LINKONCE
;
6190 if (strcmp (name
, ".vtable_map_vars") == 0)
6191 flags
|= SECTION_LINKONCE
;
6193 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6194 flags
|= SECTION_TLS
| SECTION_WRITE
;
6196 if (strcmp (name
, ".bss") == 0
6197 || strncmp (name
, ".bss.", 5) == 0
6198 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6199 || strcmp (name
, ".persistent.bss") == 0
6200 || strcmp (name
, ".sbss") == 0
6201 || strncmp (name
, ".sbss.", 6) == 0
6202 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6203 flags
|= SECTION_BSS
;
6205 if (strcmp (name
, ".tdata") == 0
6206 || strncmp (name
, ".tdata.", 7) == 0
6207 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6208 flags
|= SECTION_TLS
;
6210 if (strcmp (name
, ".tbss") == 0
6211 || strncmp (name
, ".tbss.", 6) == 0
6212 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6213 flags
|= SECTION_TLS
| SECTION_BSS
;
6215 /* These three sections have special ELF types. They are neither
6216 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6217 want to print a section type (@progbits or @nobits). If someone
6218 is silly enough to emit code or TLS variables to one of these
6219 sections, then don't handle them specially. */
6220 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6221 && (strcmp (name
, ".init_array") == 0
6222 || strcmp (name
, ".fini_array") == 0
6223 || strcmp (name
, ".preinit_array") == 0))
6224 flags
|= SECTION_NOTYPE
;
6229 /* Return true if the target supports some form of global BSS,
6230 either through bss_noswitch_section, or by selecting a BSS
6231 section in TARGET_ASM_SELECT_SECTION. */
6234 have_global_bss_p (void)
6236 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6239 /* Output assembly to switch to section NAME with attribute FLAGS.
6240 Four variants for common object file formats. */
6243 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6244 unsigned int flags ATTRIBUTE_UNUSED
,
6245 tree decl ATTRIBUTE_UNUSED
)
6247 /* Some object formats don't support named sections at all. The
6248 front-end should already have flagged this as an error. */
6252 #ifndef TLS_SECTION_ASM_FLAG
6253 #define TLS_SECTION_ASM_FLAG 'T'
6257 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6258 tree decl ATTRIBUTE_UNUSED
)
6260 char flagchars
[10], *f
= flagchars
;
6262 /* If we have already declared this section, we can use an
6263 abbreviated form to switch back to it -- unless this section is
6264 part of a COMDAT groups, in which case GAS requires the full
6265 declaration every time. */
6266 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6267 && (flags
& SECTION_DECLARED
))
6269 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6273 if (!(flags
& SECTION_DEBUG
))
6275 #if defined (HAVE_GAS_SECTION_EXCLUDE) && HAVE_GAS_SECTION_EXCLUDE == 1
6276 if (flags
& SECTION_EXCLUDE
)
6279 if (flags
& SECTION_WRITE
)
6281 if (flags
& SECTION_CODE
)
6283 if (flags
& SECTION_SMALL
)
6285 if (flags
& SECTION_MERGE
)
6287 if (flags
& SECTION_STRINGS
)
6289 if (flags
& SECTION_TLS
)
6290 *f
++ = TLS_SECTION_ASM_FLAG
;
6291 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6295 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6297 if (!(flags
& SECTION_NOTYPE
))
6302 if (flags
& SECTION_BSS
)
6308 /* On platforms that use "@" as the assembly comment character,
6310 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6312 fprintf (asm_out_file
, format
, type
);
6314 if (flags
& SECTION_ENTSIZE
)
6315 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6316 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6318 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6319 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6321 fprintf (asm_out_file
, ",%s,comdat",
6322 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6326 putc ('\n', asm_out_file
);
6330 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6331 tree decl ATTRIBUTE_UNUSED
)
6333 char flagchars
[8], *f
= flagchars
;
6335 if (flags
& SECTION_WRITE
)
6337 if (flags
& SECTION_CODE
)
6341 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6345 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6348 default_coff_asm_named_section (name
, flags
, decl
);
6350 if (flags
& SECTION_LINKONCE
)
6352 /* Functions may have been compiled at various levels of
6353 optimization so we can't use `same_size' here.
6354 Instead, have the linker pick one. */
6355 fprintf (asm_out_file
, "\t.linkonce %s\n",
6356 (flags
& SECTION_CODE
? "discard" : "same_size"));
6360 /* The lame default section selector. */
6363 default_select_section (tree decl
, int reloc
,
6364 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6368 if (decl_readonly_section (decl
, reloc
))
6369 return readonly_data_section
;
6371 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6373 if (! ((flag_pic
&& reloc
)
6374 || !TREE_READONLY (decl
)
6375 || TREE_SIDE_EFFECTS (decl
)
6376 || !TREE_CONSTANT (decl
)))
6377 return readonly_data_section
;
6379 else if (TREE_CODE (decl
) == STRING_CST
)
6380 return readonly_data_section
;
6381 else if (! (flag_pic
&& reloc
))
6382 return readonly_data_section
;
6384 return data_section
;
6387 enum section_category
6388 categorize_decl_for_section (const_tree decl
, int reloc
)
6390 enum section_category ret
;
6392 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6394 else if (TREE_CODE (decl
) == STRING_CST
)
6396 if ((flag_sanitize
& SANITIZE_ADDRESS
)
6397 && asan_protect_global (CONST_CAST_TREE (decl
)))
6398 /* or !flag_merge_constants */
6399 return SECCAT_RODATA
;
6401 return SECCAT_RODATA_MERGE_STR
;
6403 else if (TREE_CODE (decl
) == VAR_DECL
)
6405 if (bss_initializer_p (decl
))
6407 else if (! TREE_READONLY (decl
)
6408 || TREE_SIDE_EFFECTS (decl
)
6409 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6411 /* Here the reloc_rw_mask is not testing whether the section should
6412 be read-only or not, but whether the dynamic link will have to
6413 do something. If so, we wish to segregate the data in order to
6414 minimize cache misses inside the dynamic linker. */
6415 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6416 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6420 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6421 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6422 else if (reloc
|| flag_merge_constants
< 2
6423 || ((flag_sanitize
& SANITIZE_ADDRESS
)
6424 && asan_protect_global (CONST_CAST_TREE (decl
))))
6425 /* C and C++ don't allow different variables to share the same
6426 location. -fmerge-all-constants allows even that (at the
6427 expense of not conforming). */
6428 ret
= SECCAT_RODATA
;
6429 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6430 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6432 ret
= SECCAT_RODATA_MERGE_CONST
;
6434 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6436 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6437 || TREE_SIDE_EFFECTS (decl
)
6438 || ! TREE_CONSTANT (decl
))
6441 ret
= SECCAT_RODATA
;
6444 ret
= SECCAT_RODATA
;
6446 /* There are no read-only thread-local sections. */
6447 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6449 /* Note that this would be *just* SECCAT_BSS, except that there's
6450 no concept of a read-only thread-local-data section. */
6451 if (ret
== SECCAT_BSS
6452 || (flag_zero_initialized_in_bss
6453 && initializer_zerop (DECL_INITIAL (decl
))))
6459 /* If the target uses small data sections, select it. */
6460 else if (targetm
.in_small_data_p (decl
))
6462 if (ret
== SECCAT_BSS
)
6464 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6465 ret
= SECCAT_SRODATA
;
6474 decl_readonly_section_1 (enum section_category category
)
6479 case SECCAT_RODATA_MERGE_STR
:
6480 case SECCAT_RODATA_MERGE_STR_INIT
:
6481 case SECCAT_RODATA_MERGE_CONST
:
6482 case SECCAT_SRODATA
:
6490 decl_readonly_section (const_tree decl
, int reloc
)
6492 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6495 /* Select a section based on the above categorization. */
6498 default_elf_select_section (tree decl
, int reloc
,
6499 unsigned HOST_WIDE_INT align
)
6502 switch (categorize_decl_for_section (decl
, reloc
))
6505 /* We're not supposed to be called on FUNCTION_DECLs. */
6508 return readonly_data_section
;
6509 case SECCAT_RODATA_MERGE_STR
:
6510 return mergeable_string_section (decl
, align
, 0);
6511 case SECCAT_RODATA_MERGE_STR_INIT
:
6512 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6513 case SECCAT_RODATA_MERGE_CONST
:
6514 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6515 case SECCAT_SRODATA
:
6519 return data_section
;
6520 case SECCAT_DATA_REL
:
6521 sname
= ".data.rel";
6523 case SECCAT_DATA_REL_LOCAL
:
6524 sname
= ".data.rel.local";
6526 case SECCAT_DATA_REL_RO
:
6527 sname
= ".data.rel.ro";
6529 case SECCAT_DATA_REL_RO_LOCAL
:
6530 sname
= ".data.rel.ro.local";
6553 return get_named_section (decl
, sname
, reloc
);
6556 /* Construct a unique section name based on the decl name and the
6557 categorization performed above. */
6560 default_unique_section (tree decl
, int reloc
)
6562 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6563 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6564 const char *prefix
, *name
, *linkonce
;
6568 switch (categorize_decl_for_section (decl
, reloc
))
6571 prefix
= one_only
? ".t" : ".text";
6574 case SECCAT_RODATA_MERGE_STR
:
6575 case SECCAT_RODATA_MERGE_STR_INIT
:
6576 case SECCAT_RODATA_MERGE_CONST
:
6577 prefix
= one_only
? ".r" : ".rodata";
6579 case SECCAT_SRODATA
:
6580 prefix
= one_only
? ".s2" : ".sdata2";
6583 prefix
= one_only
? ".d" : ".data";
6585 case SECCAT_DATA_REL
:
6586 prefix
= one_only
? ".d.rel" : ".data.rel";
6588 case SECCAT_DATA_REL_LOCAL
:
6589 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6591 case SECCAT_DATA_REL_RO
:
6592 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6594 case SECCAT_DATA_REL_RO_LOCAL
:
6595 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6598 prefix
= one_only
? ".s" : ".sdata";
6601 prefix
= one_only
? ".b" : ".bss";
6604 prefix
= one_only
? ".sb" : ".sbss";
6607 prefix
= one_only
? ".td" : ".tdata";
6610 prefix
= one_only
? ".tb" : ".tbss";
6616 id
= DECL_ASSEMBLER_NAME (decl
);
6617 ultimate_transparent_alias_target (&id
);
6618 name
= IDENTIFIER_POINTER (id
);
6619 name
= targetm
.strip_name_encoding (name
);
6621 /* If we're using one_only, then there needs to be a .gnu.linkonce
6622 prefix to the section name. */
6623 linkonce
= one_only
? ".gnu.linkonce" : "";
6625 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6627 set_decl_section_name (decl
, string
);
6630 /* Subroutine of compute_reloc_for_rtx for leaf rtxes. */
6633 compute_reloc_for_rtx_1 (const_rtx x
)
6635 switch (GET_CODE (x
))
6638 return SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6646 /* Like compute_reloc_for_constant, except for an RTX. The return value
6647 is a mask for which bit 1 indicates a global relocation, and bit 0
6648 indicates a local relocation. */
6651 compute_reloc_for_rtx (const_rtx x
)
6653 switch (GET_CODE (x
))
6657 return compute_reloc_for_rtx_1 (x
);
6662 subrtx_iterator::array_type array
;
6663 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
6664 reloc
|= compute_reloc_for_rtx_1 (*iter
);
6674 default_select_rtx_section (machine_mode mode ATTRIBUTE_UNUSED
,
6676 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6678 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6679 return data_section
;
6681 return readonly_data_section
;
6685 default_elf_select_rtx_section (machine_mode mode
, rtx x
,
6686 unsigned HOST_WIDE_INT align
)
6688 int reloc
= compute_reloc_for_rtx (x
);
6690 /* ??? Handle small data here somehow. */
6692 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6695 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6697 return get_named_section (NULL
, ".data.rel.ro", 3);
6700 return mergeable_constant_section (mode
, align
, 0);
6703 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6706 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6711 /* Careful not to prod global register variables. */
6714 symbol
= XEXP (rtl
, 0);
6715 if (GET_CODE (symbol
) != SYMBOL_REF
)
6718 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6719 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6720 flags
|= SYMBOL_FLAG_FUNCTION
;
6721 if (targetm
.binds_local_p (decl
))
6722 flags
|= SYMBOL_FLAG_LOCAL
;
6723 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6724 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6725 else if (targetm
.in_small_data_p (decl
))
6726 flags
|= SYMBOL_FLAG_SMALL
;
6727 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6728 being PUBLIC, the thing *must* be defined in this translation unit.
6729 Prevent this buglet from being propagated into rtl code as well. */
6730 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6731 flags
|= SYMBOL_FLAG_EXTERNAL
;
6733 SYMBOL_REF_FLAGS (symbol
) = flags
;
6736 /* By default, we do nothing for encode_section_info, so we need not
6737 do anything but discard the '*' marker. */
6740 default_strip_name_encoding (const char *str
)
6742 return str
+ (*str
== '*');
6745 #ifdef ASM_OUTPUT_DEF
6746 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6747 anchor relative to ".", the current section position. */
6750 default_asm_output_anchor (rtx symbol
)
6754 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6755 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6756 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6760 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6763 default_use_anchors_for_symbol_p (const_rtx symbol
)
6768 /* Don't use anchors for mergeable sections. The linker might move
6769 the objects around. */
6770 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6771 if (sect
->common
.flags
& SECTION_MERGE
)
6774 /* Don't use anchors for small data sections. The small data register
6775 acts as an anchor for such sections. */
6776 if (sect
->common
.flags
& SECTION_SMALL
)
6779 decl
= SYMBOL_REF_DECL (symbol
);
6780 if (decl
&& DECL_P (decl
))
6782 /* Don't use section anchors for decls that might be defined or
6783 usurped by other modules. */
6784 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
6787 /* Don't use section anchors for decls that will be placed in a
6788 small data section. */
6789 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6790 one above. The problem is that we only use SECTION_SMALL for
6791 sections that should be marked as small in the section directive. */
6792 if (targetm
.in_small_data_p (decl
))
6798 /* Return true when RESOLUTION indicate that symbol will be bound to the
6799 definition provided by current .o file. */
6802 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6804 return (resolution
== LDPR_PREVAILING_DEF
6805 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6806 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6809 /* Return true when RESOLUTION indicate that symbol will be bound locally
6810 within current executable or DSO. */
6813 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6815 return (resolution
== LDPR_PREVAILING_DEF
6816 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6817 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6818 || resolution
== LDPR_PREEMPTED_REG
6819 || resolution
== LDPR_PREEMPTED_IR
6820 || resolution
== LDPR_RESOLVED_IR
6821 || resolution
== LDPR_RESOLVED_EXEC
);
6824 /* COMMON_LOCAL_P is true means that the linker can guarantee that an
6825 uninitialized common symbol in the executable will still be defined
6826 (through COPY relocation) in the executable. */
6829 default_binds_local_p_3 (const_tree exp
, bool shlib
, bool weak_dominate
,
6830 bool extern_protected_data
, bool common_local_p
)
6832 /* A non-decl is an entry in the constant pool. */
6836 /* Weakrefs may not bind locally, even though the weakref itself is always
6837 static and therefore local. Similarly, the resolver for ifunc functions
6838 might resolve to a non-local function.
6839 FIXME: We can resolve the weakref case more curefuly by looking at the
6841 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6842 || (TREE_CODE (exp
) == FUNCTION_DECL
6843 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6846 /* Static variables are always local. */
6847 if (! TREE_PUBLIC (exp
))
6850 /* With resolution file in hand, take look into resolutions.
6851 We can't just return true for resolved_locally symbols,
6852 because dynamic linking might overwrite symbols
6853 in shared libraries. */
6854 bool resolved_locally
= false;
6856 bool uninited_common
= (DECL_COMMON (exp
)
6857 && (DECL_INITIAL (exp
) == NULL
6859 && DECL_INITIAL (exp
) == error_mark_node
)));
6861 /* A non-external variable is defined locally only if it isn't
6862 uninitialized COMMON variable or common_local_p is true. */
6863 bool defined_locally
= (!DECL_EXTERNAL (exp
)
6864 && (!uninited_common
|| common_local_p
));
6865 if (symtab_node
*node
= symtab_node::get (exp
))
6867 if (node
->in_other_partition
)
6868 defined_locally
= true;
6869 if (resolution_to_local_definition_p (node
->resolution
))
6870 defined_locally
= resolved_locally
= true;
6871 else if (resolution_local_p (node
->resolution
))
6872 resolved_locally
= true;
6874 if (defined_locally
&& weak_dominate
&& !shlib
)
6875 resolved_locally
= true;
6877 /* Undefined weak symbols are never defined locally. */
6878 if (DECL_WEAK (exp
) && !defined_locally
)
6881 /* A symbol is local if the user has said explicitly that it will be,
6882 or if we have a definition for the symbol. We cannot infer visibility
6883 for undefined symbols. */
6884 if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
6885 && (TREE_CODE (exp
) == FUNCTION_DECL
6886 || !extern_protected_data
6887 || DECL_VISIBILITY (exp
) != VISIBILITY_PROTECTED
)
6888 && (DECL_VISIBILITY_SPECIFIED (exp
) || defined_locally
))
6891 /* If PIC, then assume that any global name can be overridden by
6892 symbols resolved from other modules. */
6896 /* Variables defined outside this object might not be local. */
6897 if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6900 /* Non-dominant weak symbols are not defined locally. */
6901 if (DECL_WEAK (exp
) && !resolved_locally
)
6904 /* Uninitialized COMMON variable may be unified with symbols
6905 resolved from other modules. */
6906 if (uninited_common
&& !resolved_locally
)
6909 /* Otherwise we're left with initialized (or non-common) global data
6910 which is of necessity defined locally. */
6914 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6915 wrt cross-module name binding. */
6918 default_binds_local_p (const_tree exp
)
6920 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, false, false);
6923 /* Similar to default_binds_local_p, but common symbol may be local. */
6926 default_binds_local_p_2 (const_tree exp
)
6928 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, false,
6933 default_binds_local_p_1 (const_tree exp
, int shlib
)
6935 return default_binds_local_p_3 (exp
, shlib
!= 0, false, false, false);
6938 /* Return true when references to DECL must bind to current definition in
6941 The condition is usually equivalent to whether the function binds to the
6942 current module (shared library or executable), that is to binds_local_p.
6943 We use this fact to avoid need for another target hook and implement
6944 the logic using binds_local_p and just special cases where
6945 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6946 the weak definitions (that can be overwritten at linktime by other
6947 definition from different object file) and when resolution info is available
6948 we simply use the knowledge passed to us by linker plugin. */
6950 decl_binds_to_current_def_p (const_tree decl
)
6952 gcc_assert (DECL_P (decl
));
6953 if (!targetm
.binds_local_p (decl
))
6955 if (!TREE_PUBLIC (decl
))
6958 /* When resolution is available, just use it. */
6959 if (symtab_node
*node
= symtab_node::get (decl
))
6961 if (node
->resolution
!= LDPR_UNKNOWN
)
6962 return resolution_to_local_definition_p (node
->resolution
);
6965 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6966 binds locally but still can be overwritten), DECL_COMMON (can be merged
6967 with a non-common definition somewhere in the same module) or
6969 This rely on fact that binds_local_p behave as decl_replaceable_p
6970 for all other declaration types. */
6971 if (DECL_WEAK (decl
))
6973 if (DECL_COMMON (decl
)
6974 && (DECL_INITIAL (decl
) == NULL
6975 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6977 if (DECL_EXTERNAL (decl
))
6982 /* A replaceable function or variable is one which may be replaced
6983 at link-time with an entirely different definition, provided that the
6984 replacement has the same type. For example, functions declared
6985 with __attribute__((weak)) on most systems are replaceable.
6987 COMDAT functions are not replaceable, since all definitions of the
6988 function must be equivalent. It is important that COMDAT functions
6989 not be treated as replaceable so that use of C++ template
6990 instantiations is not penalized. */
6993 decl_replaceable_p (tree decl
)
6995 gcc_assert (DECL_P (decl
));
6996 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
6998 if (!flag_semantic_interposition
6999 && !DECL_WEAK (decl
))
7001 return !decl_binds_to_current_def_p (decl
);
7004 /* Default function to output code that will globalize a label. A
7005 target must define GLOBAL_ASM_OP or provide its own function to
7006 globalize a label. */
7007 #ifdef GLOBAL_ASM_OP
7009 default_globalize_label (FILE * stream
, const char *name
)
7011 fputs (GLOBAL_ASM_OP
, stream
);
7012 assemble_name (stream
, name
);
7013 putc ('\n', stream
);
7015 #endif /* GLOBAL_ASM_OP */
7017 /* Default function to output code that will globalize a declaration. */
7019 default_globalize_decl_name (FILE * stream
, tree decl
)
7021 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
7022 targetm
.asm_out
.globalize_label (stream
, name
);
7025 /* Default function to output a label for unwind information. The
7026 default is to do nothing. A target that needs nonlocal labels for
7027 unwind information must provide its own function to do this. */
7029 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
7030 tree decl ATTRIBUTE_UNUSED
,
7031 int for_eh ATTRIBUTE_UNUSED
,
7032 int empty ATTRIBUTE_UNUSED
)
7036 /* Default function to output a label to divide up the exception table.
7037 The default is to do nothing. A target that needs/wants to divide
7038 up the table must provide it's own function to do this. */
7040 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
7044 /* This is how to output an internal numbered label where PREFIX is
7045 the class of label and LABELNO is the number within the class. */
7048 default_generate_internal_label (char *buf
, const char *prefix
,
7049 unsigned long labelno
)
7051 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7054 /* This is how to output an internal numbered label where PREFIX is
7055 the class of label and LABELNO is the number within the class. */
7058 default_internal_label (FILE *stream
, const char *prefix
,
7059 unsigned long labelno
)
7061 char *const buf
= (char *) alloca (40 + strlen (prefix
));
7062 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7063 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
7067 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
7070 default_asm_declare_constant_name (FILE *file
, const char *name
,
7071 const_tree exp ATTRIBUTE_UNUSED
,
7072 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
7074 assemble_label (file
, name
);
7077 /* This is the default behavior at the beginning of a file. It's
7078 controlled by two other target-hook toggles. */
7080 default_file_start (void)
7082 if (targetm
.asm_file_start_app_off
7083 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
7084 fputs (ASM_APP_OFF
, asm_out_file
);
7086 if (targetm
.asm_file_start_file_directive
)
7088 /* LTO produced units have no meaningful main_input_filename. */
7090 output_file_directive (asm_out_file
, "<artificial>");
7092 output_file_directive (asm_out_file
, main_input_filename
);
7096 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
7097 which emits a special section directive used to indicate whether or
7098 not this object file needs an executable stack. This is primarily
7099 a GNU extension to ELF but could be used on other targets. */
7101 int trampolines_created
;
7104 file_end_indicate_exec_stack (void)
7106 unsigned int flags
= SECTION_DEBUG
;
7107 if (trampolines_created
)
7108 flags
|= SECTION_CODE
;
7110 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
7113 /* Emit a special section directive to indicate that this object file
7114 was compiled with -fsplit-stack. This is used to let the linker
7115 detect calls between split-stack code and non-split-stack code, so
7116 that it can modify the split-stack code to allocate a sufficiently
7117 large stack. We emit another special section if there are any
7118 functions in this file which have the no_split_stack attribute, to
7119 prevent the linker from warning about being unable to convert the
7120 functions if they call non-split-stack code. */
7123 file_end_indicate_split_stack (void)
7125 if (flag_split_stack
)
7127 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
7129 if (saw_no_split_stack
)
7130 switch_to_section (get_section (".note.GNU-no-split-stack",
7131 SECTION_DEBUG
, NULL
));
7135 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
7136 a get_unnamed_section callback. */
7139 output_section_asm_op (const void *directive
)
7141 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
7144 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
7145 the current section is NEW_SECTION. */
7148 switch_to_section (section
*new_section
)
7150 if (in_section
== new_section
)
7153 if (new_section
->common
.flags
& SECTION_FORGET
)
7156 in_section
= new_section
;
7158 switch (SECTION_STYLE (new_section
))
7161 targetm
.asm_out
.named_section (new_section
->named
.name
,
7162 new_section
->named
.common
.flags
,
7163 new_section
->named
.decl
);
7166 case SECTION_UNNAMED
:
7167 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
7170 case SECTION_NOSWITCH
:
7175 new_section
->common
.flags
|= SECTION_DECLARED
;
7178 /* If block symbol SYMBOL has not yet been assigned an offset, place
7179 it at the end of its block. */
7182 place_block_symbol (rtx symbol
)
7184 unsigned HOST_WIDE_INT size
, mask
, offset
;
7185 struct constant_descriptor_rtx
*desc
;
7186 unsigned int alignment
;
7187 struct object_block
*block
;
7190 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7191 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7194 /* Work out the symbol's size and alignment. */
7195 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7197 desc
= SYMBOL_REF_CONSTANT (symbol
);
7198 alignment
= desc
->align
;
7199 size
= GET_MODE_SIZE (desc
->mode
);
7201 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7203 decl
= SYMBOL_REF_DECL (symbol
);
7204 gcc_checking_assert (DECL_IN_CONSTANT_POOL (decl
));
7205 alignment
= DECL_ALIGN (decl
);
7206 size
= get_constant_size (DECL_INITIAL (decl
));
7207 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7208 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7209 && asan_protect_global (DECL_INITIAL (decl
)))
7210 size
+= asan_red_zone_size (size
);
7214 struct symtab_node
*snode
;
7215 decl
= SYMBOL_REF_DECL (symbol
);
7217 snode
= symtab_node::get (decl
);
7220 rtx target
= DECL_RTL (snode
->ultimate_alias_target ()->decl
);
7222 gcc_assert (MEM_P (target
)
7223 && GET_CODE (XEXP (target
, 0)) == SYMBOL_REF
7224 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (target
, 0)));
7225 target
= XEXP (target
, 0);
7226 place_block_symbol (target
);
7227 SYMBOL_REF_BLOCK_OFFSET (symbol
) = SYMBOL_REF_BLOCK_OFFSET (target
);
7230 alignment
= get_variable_align (decl
);
7231 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7232 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7233 && asan_protect_global (decl
))
7235 size
+= asan_red_zone_size (size
);
7236 alignment
= MAX (alignment
,
7237 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7241 /* Calculate the object's offset from the start of the block. */
7242 block
= SYMBOL_REF_BLOCK (symbol
);
7243 mask
= alignment
/ BITS_PER_UNIT
- 1;
7244 offset
= (block
->size
+ mask
) & ~mask
;
7245 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7247 /* Record the block's new alignment and size. */
7248 block
->alignment
= MAX (block
->alignment
, alignment
);
7249 block
->size
= offset
+ size
;
7251 vec_safe_push (block
->objects
, symbol
);
7254 /* Return the anchor that should be used to address byte offset OFFSET
7255 from the first object in BLOCK. MODEL is the TLS model used
7259 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7260 enum tls_model model
)
7263 unsigned int begin
, middle
, end
;
7264 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7267 /* Work out the anchor's offset. Use an offset of 0 for the first
7268 anchor so that we don't pessimize the case where we take the address
7269 of a variable at the beginning of the block. This is particularly
7270 useful when a block has only one variable assigned to it.
7272 We try to place anchors RANGE bytes apart, so there can then be
7273 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7274 a ptr_mode offset. With some target settings, the lowest such
7275 anchor might be out of range for the lowest ptr_mode offset;
7276 likewise the highest anchor for the highest offset. Use anchors
7277 at the extreme ends of the ptr_mode range in such cases.
7279 All arithmetic uses unsigned integers in order to avoid
7281 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7282 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7283 range
= max_offset
- min_offset
+ 1;
7288 bias
= HOST_WIDE_INT_1U
<< (GET_MODE_BITSIZE (ptr_mode
) - 1);
7291 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7292 delta
-= delta
% range
;
7295 offset
= (HOST_WIDE_INT
) (-delta
);
7299 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7300 delta
-= delta
% range
;
7301 if (delta
> bias
- 1)
7303 offset
= (HOST_WIDE_INT
) delta
;
7307 /* Do a binary search to see if there's already an anchor we can use.
7308 Set BEGIN to the new anchor's index if not. */
7310 end
= vec_safe_length (block
->anchors
);
7311 while (begin
!= end
)
7313 middle
= (end
+ begin
) / 2;
7314 anchor
= (*block
->anchors
)[middle
];
7315 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7317 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7319 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7321 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7327 /* Create a new anchor with a unique label. */
7328 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7329 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7330 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7331 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7333 /* Insert it at index BEGIN. */
7334 vec_safe_insert (block
->anchors
, begin
, anchor
);
7338 /* Output the objects in BLOCK. */
7341 output_object_block (struct object_block
*block
)
7343 struct constant_descriptor_rtx
*desc
;
7345 HOST_WIDE_INT offset
;
7349 if (!block
->objects
)
7352 /* Switch to the section and make sure that the first byte is
7353 suitably aligned. */
7354 switch_to_section (block
->sect
);
7355 assemble_align (block
->alignment
);
7357 /* Define the values of all anchors relative to the current section
7359 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7360 targetm
.asm_out
.output_anchor (symbol
);
7362 /* Output the objects themselves. */
7364 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7366 /* Move to the object's offset, padding with zeros if necessary. */
7367 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7368 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7369 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7371 desc
= SYMBOL_REF_CONSTANT (symbol
);
7372 output_constant_pool_1 (desc
, 1);
7373 offset
+= GET_MODE_SIZE (desc
->mode
);
7375 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7378 decl
= SYMBOL_REF_DECL (symbol
);
7379 assemble_constant_contents
7380 (DECL_INITIAL (decl
), XSTR (symbol
, 0), DECL_ALIGN (decl
));
7382 size
= get_constant_size (DECL_INITIAL (decl
));
7384 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7385 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7386 && asan_protect_global (DECL_INITIAL (decl
)))
7388 size
= asan_red_zone_size (size
);
7389 assemble_zeros (size
);
7396 decl
= SYMBOL_REF_DECL (symbol
);
7397 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7398 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7400 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7401 && asan_protect_global (decl
))
7403 size
= asan_red_zone_size (size
);
7404 assemble_zeros (size
);
7411 /* A htab_traverse callback used to call output_object_block for
7412 each member of object_block_htab. */
7415 output_object_block_htab (object_block
**slot
, void *)
7417 output_object_block (*slot
);
7421 /* Output the definitions of all object_blocks. */
7424 output_object_blocks (void)
7426 object_block_htab
->traverse
<void *, output_object_block_htab
> (NULL
);
7429 /* This function provides a possible implementation of the
7430 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7431 by -frecord-gcc-switches it creates a new mergeable, string section in the
7432 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7433 contains the switches in ASCII format.
7435 FIXME: This code does not correctly handle double quote characters
7436 that appear inside strings, (it strips them rather than preserving them).
7437 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7438 characters - instead it treats them as sub-string separators. Since
7439 we want to emit NUL strings terminators into the object file we have to use
7443 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7447 case SWITCH_TYPE_PASSED
:
7448 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7449 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7452 case SWITCH_TYPE_DESCRIPTIVE
:
7455 /* Distinguish between invocations where name is NULL. */
7456 static bool started
= false;
7462 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7466 | (SECTION_ENTSIZE
& 1),
7468 switch_to_section (sec
);
7477 /* The return value is currently ignored by the caller, but must be 0.
7478 For -fverbose-asm the return value would be the number of characters
7479 emitted into the assembler file. */
7483 /* Emit text to declare externally defined symbols. It is needed to
7484 properly support non-default visibility. */
7486 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7488 const char *name ATTRIBUTE_UNUSED
)
7490 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7491 set in order to avoid putting out names that are never really
7492 used. Always output visibility specified in the source. */
7493 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7494 && (DECL_VISIBILITY_SPECIFIED (decl
)
7495 || targetm
.binds_local_p (decl
)))
7496 maybe_assemble_visibility (decl
);
7499 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7502 default_asm_output_source_filename (FILE *file
, const char *name
)
7504 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7505 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7507 fprintf (file
, "\t.file\t");
7508 output_quoted_string (file
, name
);
7513 /* Output a file name in the form wanted by System V. */
7516 output_file_directive (FILE *asm_file
, const char *input_name
)
7521 if (input_name
== NULL
)
7522 input_name
= "<stdin>";
7524 input_name
= remap_debug_filename (input_name
);
7526 len
= strlen (input_name
);
7527 na
= input_name
+ len
;
7529 /* NA gets INPUT_NAME sans directory names. */
7530 while (na
> input_name
)
7532 if (IS_DIR_SEPARATOR (na
[-1]))
7537 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7540 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7543 make_debug_expr_from_rtl (const_rtx exp
)
7545 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7546 machine_mode mode
= GET_MODE (exp
);
7549 DECL_ARTIFICIAL (ddecl
) = 1;
7550 if (REG_P (exp
) && REG_EXPR (exp
))
7551 type
= TREE_TYPE (REG_EXPR (exp
));
7552 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7553 type
= TREE_TYPE (MEM_EXPR (exp
));
7556 if (type
&& TYPE_MODE (type
) == mode
)
7557 TREE_TYPE (ddecl
) = type
;
7559 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7560 DECL_MODE (ddecl
) = mode
;
7561 dval
= gen_rtx_DEBUG_EXPR (mode
);
7562 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7563 SET_DECL_RTL (ddecl
, dval
);
7567 #ifdef ELF_ASCII_ESCAPES
7568 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7571 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7576 fputs (STRING_ASM_OP
, f
);
7581 escape
= ELF_ASCII_ESCAPES
[c
];
7588 /* TODO: Print in hex with fast function, important for -flto. */
7589 fprintf (f
, "\\%03o", c
);
7602 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7605 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7607 const char *limit
= s
+ len
;
7608 const char *last_null
= NULL
;
7609 unsigned bytes_in_chunk
= 0;
7613 for (; s
< limit
; s
++)
7617 if (bytes_in_chunk
>= 60)
7626 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7633 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7635 if (bytes_in_chunk
> 0)
7642 default_elf_asm_output_limited_string (f
, s
);
7647 if (bytes_in_chunk
== 0)
7648 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7651 escape
= ELF_ASCII_ESCAPES
[c
];
7659 /* TODO: Print in hex with fast function, important for -flto. */
7660 fprintf (f
, "\\%03o", c
);
7661 bytes_in_chunk
+= 4;
7666 bytes_in_chunk
+= 2;
7673 if (bytes_in_chunk
> 0)
7681 static GTY(()) section
*elf_init_array_section
;
7682 static GTY(()) section
*elf_fini_array_section
;
7685 get_elf_initfini_array_priority_section (int priority
,
7689 if (priority
!= DEFAULT_INIT_PRIORITY
)
7692 sprintf (buf
, "%s.%.5u",
7693 constructor_p
? ".init_array" : ".fini_array",
7695 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7701 if (elf_init_array_section
== NULL
)
7702 elf_init_array_section
7703 = get_section (".init_array",
7704 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7705 sec
= elf_init_array_section
;
7709 if (elf_fini_array_section
== NULL
)
7710 elf_fini_array_section
7711 = get_section (".fini_array",
7712 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7713 sec
= elf_fini_array_section
;
7719 /* Use .init_array section for constructors. */
7722 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7724 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7726 assemble_addr_to_section (symbol
, sec
);
7729 /* Use .fini_array section for destructors. */
7732 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7734 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7736 assemble_addr_to_section (symbol
, sec
);
7739 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7741 This is a bit of a cheat. The real default is a no-op, but this
7742 hook is the default for all targets with a .ident directive. */
7745 default_asm_output_ident_directive (const char *ident_str
)
7747 const char *ident_asm_op
= "\t.ident\t";
7749 /* If we are still in the front end, do not write out the string
7750 to asm_out_file. Instead, add a fake top-level asm statement.
7751 This allows the front ends to use this hook without actually
7752 writing to asm_out_file, to handle #ident or Pragma Ident. */
7753 if (symtab
->state
== PARSING
)
7755 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7756 symtab
->finalize_toplevel_asm (build_string (strlen (buf
), buf
));
7759 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7762 #include "gt-varasm.h"