1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987-2013 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
21 /* This file handles generation of all the assembler code
22 *except* the instructions of a function.
23 This includes declarations of variables and their initial values.
25 We also output the assembler code for constants stored in memory
26 and are responsible for combining constants with the same value. */
30 #include "coretypes.h"
37 #include "hard-reg-set.h"
40 #include "diagnostic-core.h"
43 #include "langhooks.h"
47 #include "common/common-target.h"
48 #include "targhooks.h"
49 #include "tree-mudflap.h"
51 #include "pointer-set.h"
54 #ifdef XCOFF_DEBUGGING_INFO
55 #include "xcoffout.h" /* Needed for external data
56 declarations for e.g. AIX 4.x. */
59 /* The (assembler) name of the first globally-visible object output. */
60 extern GTY(()) const char *first_global_object_name
;
61 extern GTY(()) const char *weak_global_object_name
;
63 const char *first_global_object_name
;
64 const char *weak_global_object_name
;
67 struct constant_descriptor_rtx
;
68 struct rtx_constant_pool
;
70 #define n_deferred_constants (crtl->varasm.deferred_constants)
72 /* Number for making the label on the next
73 constant that is stored in memory. */
75 static GTY(()) int const_labelno
;
77 /* Carry information from ASM_DECLARE_OBJECT_NAME
78 to ASM_FINISH_DECLARE_OBJECT. */
80 int size_directive_output
;
82 /* The last decl for which assemble_variable was called,
83 if it did ASM_DECLARE_OBJECT_NAME.
84 If the last call to assemble_variable didn't do that,
87 tree last_assemble_variable_decl
;
89 /* The following global variable indicates if the first basic block
90 in a function belongs to the cold partition or not. */
92 bool first_function_block_is_cold
;
94 /* We give all constants their own alias set. Perhaps redundant with
95 MEM_READONLY_P, but pre-dates it. */
97 static alias_set_type const_alias_set
;
99 /* Whether we saw any functions with no_split_stack. */
101 static bool saw_no_split_stack
;
103 static const char *strip_reg_name (const char *);
104 static int contains_pointers_p (tree
);
105 #ifdef ASM_OUTPUT_EXTERNAL
106 static bool incorporeal_function_p (tree
);
108 static void decode_addr_const (tree
, struct addr_const
*);
109 static hashval_t
const_desc_hash (const void *);
110 static int const_desc_eq (const void *, const void *);
111 static hashval_t
const_hash_1 (const tree
);
112 static int compare_constant (const tree
, const tree
);
113 static tree
copy_constant (tree
);
114 static void output_constant_def_contents (rtx
);
115 static void output_addressed_constants (tree
);
116 static unsigned HOST_WIDE_INT
array_size_for_constructor (tree
);
117 static unsigned min_align (unsigned, unsigned);
118 static void globalize_decl (tree
);
119 static bool decl_readonly_section_1 (enum section_category
);
120 #ifdef BSS_SECTION_ASM_OP
121 #ifdef ASM_OUTPUT_ALIGNED_BSS
122 static void asm_output_aligned_bss (FILE *, tree
, const char *,
123 unsigned HOST_WIDE_INT
, int)
126 #endif /* BSS_SECTION_ASM_OP */
127 static void mark_weak (tree
);
128 static void output_constant_pool (const char *, tree
);
130 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
131 section
*text_section
;
132 section
*data_section
;
133 section
*readonly_data_section
;
134 section
*sdata_section
;
135 section
*ctors_section
;
136 section
*dtors_section
;
137 section
*bss_section
;
138 section
*sbss_section
;
140 /* Various forms of common section. All are guaranteed to be nonnull. */
141 section
*tls_comm_section
;
142 section
*comm_section
;
143 section
*lcomm_section
;
145 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
147 section
*bss_noswitch_section
;
149 /* The section that holds the main exception table, when known. The section
150 is set either by the target's init_sections hook or by the first call to
151 switch_to_exception_section. */
152 section
*exception_section
;
154 /* The section that holds the DWARF2 frame unwind information, when known.
155 The section is set either by the target's init_sections hook or by the
156 first call to switch_to_eh_frame_section. */
157 section
*eh_frame_section
;
159 /* asm_out_file's current section. This is NULL if no section has yet
160 been selected or if we lose track of what the current section is. */
163 /* True if code for the current function is currently being directed
164 at the cold section. */
165 bool in_cold_section_p
;
167 /* A linked list of all the unnamed sections. */
168 static GTY(()) section
*unnamed_sections
;
170 /* Return a nonzero value if DECL has a section attribute. */
171 #define IN_NAMED_SECTION(DECL) \
172 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
173 && DECL_SECTION_NAME (DECL) != NULL_TREE)
175 /* Hash table of named sections. */
176 static GTY((param_is (section
))) htab_t section_htab
;
178 /* A table of object_blocks, indexed by section. */
179 static GTY((param_is (struct object_block
))) htab_t object_block_htab
;
181 /* The next number to use for internal anchor labels. */
182 static GTY(()) int anchor_labelno
;
184 /* A pool of constants that can be shared between functions. */
185 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
187 /* Helper routines for maintaining section_htab. */
190 section_entry_eq (const void *p1
, const void *p2
)
192 const section
*old
= (const section
*) p1
;
193 const char *new_name
= (const char *) p2
;
195 return strcmp (old
->named
.name
, new_name
) == 0;
199 section_entry_hash (const void *p
)
201 const section
*old
= (const section
*) p
;
202 return htab_hash_string (old
->named
.name
);
205 /* Return a hash value for section SECT. */
208 hash_section (section
*sect
)
210 if (sect
->common
.flags
& SECTION_NAMED
)
211 return htab_hash_string (sect
->named
.name
);
212 return sect
->common
.flags
;
215 /* Helper routines for maintaining object_block_htab. */
218 object_block_entry_eq (const void *p1
, const void *p2
)
220 const struct object_block
*old
= (const struct object_block
*) p1
;
221 const section
*new_section
= (const section
*) p2
;
223 return old
->sect
== new_section
;
227 object_block_entry_hash (const void *p
)
229 const struct object_block
*old
= (const struct object_block
*) p
;
230 return hash_section (old
->sect
);
233 /* Return a new unnamed section with the given fields. */
236 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
241 sect
= ggc_alloc_section ();
242 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
243 sect
->unnamed
.callback
= callback
;
244 sect
->unnamed
.data
= data
;
245 sect
->unnamed
.next
= unnamed_sections
;
247 unnamed_sections
= sect
;
251 /* Return a SECTION_NOSWITCH section with the given fields. */
254 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
258 sect
= ggc_alloc_section ();
259 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
260 sect
->noswitch
.callback
= callback
;
265 /* Return the named section structure associated with NAME. Create
266 a new section with the given fields if no such structure exists. */
269 get_section (const char *name
, unsigned int flags
, tree decl
)
271 section
*sect
, **slot
;
274 htab_find_slot_with_hash (section_htab
, name
,
275 htab_hash_string (name
), INSERT
);
276 flags
|= SECTION_NAMED
;
279 sect
= ggc_alloc_section ();
280 sect
->named
.common
.flags
= flags
;
281 sect
->named
.name
= ggc_strdup (name
);
282 sect
->named
.decl
= decl
;
288 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
289 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
291 /* It is fine if one of the section flags is
292 SECTION_WRITE | SECTION_RELRO and the other has none of these
293 flags (i.e. read-only) in named sections and either the
294 section hasn't been declared yet or has been declared as writable.
295 In that case just make sure the resulting flags are
296 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
298 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
299 == (SECTION_WRITE
| SECTION_RELRO
)
300 && (sect
->common
.flags
301 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
302 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
303 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
304 || (sect
->common
.flags
& SECTION_WRITE
)))
306 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
309 /* Sanity check user variables for flag changes. */
311 decl
= sect
->named
.decl
;
313 if (sect
->named
.decl
== NULL
)
314 error ("%+D causes a section type conflict", decl
);
317 error ("%+D causes a section type conflict with %D",
318 decl
, sect
->named
.decl
);
319 if (decl
!= sect
->named
.decl
)
320 inform (DECL_SOURCE_LOCATION (sect
->named
.decl
),
321 "%qD was declared here", sect
->named
.decl
);
323 /* Make sure we don't error about one section multiple times. */
324 sect
->common
.flags
|= SECTION_OVERRIDE
;
330 /* Return true if the current compilation mode benefits from having
331 objects grouped into blocks. */
334 use_object_blocks_p (void)
336 return flag_section_anchors
;
339 /* Return the object_block structure for section SECT. Create a new
340 structure if we haven't created one already. Return null if SECT
343 static struct object_block
*
344 get_block_for_section (section
*sect
)
346 struct object_block
*block
;
352 slot
= htab_find_slot_with_hash (object_block_htab
, sect
,
353 hash_section (sect
), INSERT
);
354 block
= (struct object_block
*) *slot
;
357 block
= ggc_alloc_cleared_object_block ();
364 /* Create a symbol with label LABEL and place it at byte offset
365 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
366 is not yet known. LABEL must be a garbage-collected string. */
369 create_block_symbol (const char *label
, struct object_block
*block
,
370 HOST_WIDE_INT offset
)
375 /* Create the extended SYMBOL_REF. */
376 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
377 symbol
= ggc_alloc_rtx_def (size
);
379 /* Initialize the normal SYMBOL_REF fields. */
380 memset (symbol
, 0, size
);
381 PUT_CODE (symbol
, SYMBOL_REF
);
382 PUT_MODE (symbol
, Pmode
);
383 XSTR (symbol
, 0) = label
;
384 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
386 /* Initialize the block_symbol stuff. */
387 SYMBOL_REF_BLOCK (symbol
) = block
;
388 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
393 /* Return a section with a particular name and with whatever SECTION_*
394 flags section_type_flags deems appropriate. The name of the section
395 is taken from NAME if nonnull, otherwise it is taken from DECL's
396 DECL_SECTION_NAME. DECL is the decl associated with the section
397 (see the section comment for details) and RELOC is as for
398 section_type_flags. */
401 get_named_section (tree decl
, const char *name
, int reloc
)
407 gcc_assert (decl
&& DECL_P (decl
) && DECL_SECTION_NAME (decl
));
408 name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
411 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
413 if (decl
&& !DECL_P (decl
))
415 return get_section (name
, flags
, decl
);
418 /* If required, set DECL_SECTION_NAME to a unique name. */
421 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
422 int flag_function_or_data_sections
)
424 if (DECL_SECTION_NAME (decl
) == NULL_TREE
425 && targetm_common
.have_named_sections
426 && (flag_function_or_data_sections
427 || DECL_ONE_ONLY (decl
)))
429 targetm
.asm_out
.unique_section (decl
, reloc
);
430 DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
) = true;
434 #ifdef BSS_SECTION_ASM_OP
436 #ifdef ASM_OUTPUT_ALIGNED_BSS
438 /* Utility function for targets to use in implementing
439 ASM_OUTPUT_ALIGNED_BSS.
440 ??? It is believed that this function will work in most cases so such
441 support is localized here. */
444 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
445 const char *name
, unsigned HOST_WIDE_INT size
,
448 switch_to_section (bss_section
);
449 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
450 #ifdef ASM_DECLARE_OBJECT_NAME
451 last_assemble_variable_decl
= decl
;
452 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
454 /* Standard thing is just output label for the object. */
455 ASM_OUTPUT_LABEL (file
, name
);
456 #endif /* ASM_DECLARE_OBJECT_NAME */
457 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
462 #endif /* BSS_SECTION_ASM_OP */
464 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
465 /* Return the hot section for function DECL. Return text_section for
469 hot_function_section (tree decl
)
471 if (decl
!= NULL_TREE
472 && DECL_SECTION_NAME (decl
) != NULL_TREE
473 && targetm_common
.have_named_sections
)
474 return get_named_section (decl
, NULL
, 0);
480 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
483 When DECL_SECTION_NAME is non-NULL and it is implicit section and
484 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
485 concatenate the name with NAMED_SECTION_SUFFIX.
486 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
489 get_named_text_section (tree decl
,
490 const char *text_section_name
,
491 const char *named_section_suffix
)
493 if (decl
&& DECL_SECTION_NAME (decl
))
495 if (named_section_suffix
)
497 tree dsn
= DECL_SECTION_NAME (decl
);
498 const char *stripped_name
;
501 name
= (char *) alloca (TREE_STRING_LENGTH (dsn
) + 1);
502 memcpy (name
, TREE_STRING_POINTER (dsn
),
503 TREE_STRING_LENGTH (dsn
) + 1);
505 stripped_name
= targetm
.strip_name_encoding (name
);
507 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
508 return get_named_section (decl
, buffer
, 0);
510 else if (DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
))
514 /* Do not try to split gnu_linkonce functions. This gets somewhat
516 if (DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
)
518 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
519 name
= targetm
.strip_name_encoding (name
);
520 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
526 return get_named_section (decl
, text_section_name
, 0);
529 /* Choose named function section based on its frequency. */
532 default_function_section (tree decl
, enum node_frequency freq
,
533 bool startup
, bool exit
)
535 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
536 /* Old GNU linkers have buggy --gc-section support, which sometimes
537 results in .gcc_except_table* sections being garbage collected. */
539 && DECL_SECTION_NAME (decl
)
540 && DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
))
544 if (!flag_reorder_functions
545 || !targetm_common
.have_named_sections
)
547 /* Startup code should go to startup subsection unless it is
548 unlikely executed (this happens especially with function splitting
549 where we can split away unnecessary parts of static constructors. */
550 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
551 return get_named_text_section (decl
, ".text.startup", NULL
);
553 /* Similarly for exit. */
554 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
555 return get_named_text_section (decl
, ".text.exit", NULL
);
557 /* Group cold functions together, similarly for hot code. */
560 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
561 return get_named_text_section (decl
, ".text.unlikely", NULL
);
562 case NODE_FREQUENCY_HOT
:
563 return get_named_text_section (decl
, ".text.hot", NULL
);
569 /* Return the section for function DECL.
571 If DECL is NULL_TREE, return the text section. We can be passed
572 NULL_TREE under some circumstances by dbxout.c at least.
574 If FORCE_COLD is true, return cold function section ignoring
575 the frequency info of cgraph_node. */
578 function_section_1 (tree decl
, bool force_cold
)
580 section
*section
= NULL
;
581 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
582 bool startup
= false, exit
= false;
586 struct cgraph_node
*node
= cgraph_get_node (decl
);
590 freq
= node
->frequency
;
591 startup
= node
->only_called_at_startup
;
592 exit
= node
->only_called_at_exit
;
596 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
598 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
599 if (decl
!= NULL_TREE
600 && DECL_SECTION_NAME (decl
) != NULL_TREE
)
602 if (targetm
.asm_out
.function_section
)
603 section
= targetm
.asm_out
.function_section (decl
, freq
,
607 return get_named_section (decl
, NULL
, 0);
610 return targetm
.asm_out
.select_section
611 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
614 if (targetm
.asm_out
.function_section
)
615 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
618 return hot_function_section (decl
);
622 /* Return the section for function DECL.
624 If DECL is NULL_TREE, return the text section. We can be passed
625 NULL_TREE under some circumstances by dbxout.c at least. */
628 function_section (tree decl
)
630 /* Handle cases where function splitting code decides
631 to put function entry point into unlikely executed section
632 despite the fact that the function itself is not cold
633 (i.e. it is called rarely but contains a hot loop that is
634 better to live in hot subsection for the code locality). */
635 return function_section_1 (decl
,
636 first_function_block_is_cold
);
639 /* Return the section for the current function, take IN_COLD_SECTION_P
643 current_function_section (void)
645 return function_section_1 (current_function_decl
, in_cold_section_p
);
648 /* Tell assembler to switch to unlikely-to-be-executed text section. */
651 unlikely_text_section (void)
653 return function_section_1 (current_function_decl
, true);
656 /* When called within a function context, return true if the function
657 has been assigned a cold text section and if SECT is that section.
658 When called outside a function context, return true if SECT is the
659 default cold section. */
662 unlikely_text_section_p (section
*sect
)
664 return sect
== function_section_1 (current_function_decl
, true);
667 /* Return the read-only data section associated with function DECL. */
670 default_function_rodata_section (tree decl
)
672 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
674 const char *name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
676 if (DECL_ONE_ONLY (decl
) && HAVE_COMDAT_GROUP
)
682 dot
= strchr (name
+ 1, '.');
685 len
= strlen (dot
) + 8;
686 rname
= (char *) alloca (len
);
688 strcpy (rname
, ".rodata");
690 return get_section (rname
, SECTION_LINKONCE
, decl
);
692 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
693 else if (DECL_ONE_ONLY (decl
)
694 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
696 size_t len
= strlen (name
) + 1;
697 char *rname
= (char *) alloca (len
);
699 memcpy (rname
, name
, len
);
701 return get_section (rname
, SECTION_LINKONCE
, decl
);
703 /* For .text.foo we want to use .rodata.foo. */
704 else if (flag_function_sections
&& flag_data_sections
705 && strncmp (name
, ".text.", 6) == 0)
707 size_t len
= strlen (name
) + 1;
708 char *rname
= (char *) alloca (len
+ 2);
710 memcpy (rname
, ".rodata", 7);
711 memcpy (rname
+ 7, name
+ 5, len
- 5);
712 return get_section (rname
, 0, decl
);
716 return readonly_data_section
;
719 /* Return the read-only data section associated with function DECL
720 for targets where that section should be always the single
721 readonly data section. */
724 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
726 return readonly_data_section
;
729 /* Return the section to use for string merging. */
732 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
733 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
734 unsigned int flags ATTRIBUTE_UNUSED
)
738 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
739 && TREE_CODE (decl
) == STRING_CST
740 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
742 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
743 && TREE_STRING_LENGTH (decl
) >= len
)
745 enum machine_mode mode
;
746 unsigned int modesize
;
750 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
751 char *name
= (char *) alloca (strlen (prefix
) + 30);
753 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
754 modesize
= GET_MODE_BITSIZE (mode
);
755 if (modesize
>= 8 && modesize
<= 256
756 && (modesize
& (modesize
- 1)) == 0)
758 if (align
< modesize
)
761 str
= TREE_STRING_POINTER (decl
);
762 unit
= GET_MODE_SIZE (mode
);
764 /* Check for embedded NUL characters. */
765 for (i
= 0; i
< len
; i
+= unit
)
767 for (j
= 0; j
< unit
; j
++)
768 if (str
[i
+ j
] != '\0')
775 sprintf (name
, "%s.str%d.%d", prefix
,
776 modesize
/ 8, (int) (align
/ 8));
777 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
778 return get_section (name
, flags
, NULL
);
783 return readonly_data_section
;
786 /* Return the section to use for constant merging. */
789 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
790 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
791 unsigned int flags ATTRIBUTE_UNUSED
)
793 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
795 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
801 && (align
& (align
- 1)) == 0)
803 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
804 char *name
= (char *) alloca (strlen (prefix
) + 30);
806 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
807 flags
|= (align
/ 8) | SECTION_MERGE
;
808 return get_section (name
, flags
, NULL
);
810 return readonly_data_section
;
813 /* Given NAME, a putative register name, discard any customary prefixes. */
816 strip_reg_name (const char *name
)
818 #ifdef REGISTER_PREFIX
819 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
820 name
+= strlen (REGISTER_PREFIX
);
822 if (name
[0] == '%' || name
[0] == '#')
827 /* The user has asked for a DECL to have a particular name. Set (or
828 change) it in such a way that we don't prefix an underscore to
831 set_user_assembler_name (tree decl
, const char *name
)
833 char *starred
= (char *) alloca (strlen (name
) + 2);
835 strcpy (starred
+ 1, name
);
836 change_decl_assembler_name (decl
, get_identifier (starred
));
837 SET_DECL_RTL (decl
, NULL_RTX
);
840 /* Decode an `asm' spec for a declaration as a register name.
841 Return the register number, or -1 if nothing specified,
842 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
843 or -3 if ASMSPEC is `cc' and is not recognized,
844 or -4 if ASMSPEC is `memory' and is not recognized.
845 Accept an exact spelling or a decimal number.
846 Prefixes such as % are optional. */
849 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
851 /* Presume just one register is clobbered. */
858 /* Get rid of confusing prefixes. */
859 asmspec
= strip_reg_name (asmspec
);
861 /* Allow a decimal number as a "register name". */
862 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
863 if (! ISDIGIT (asmspec
[i
]))
865 if (asmspec
[0] != 0 && i
< 0)
868 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0)
874 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
876 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
879 #ifdef OVERLAPPING_REGISTER_NAMES
883 const char *const name
;
886 } table
[] = OVERLAPPING_REGISTER_NAMES
;
888 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
890 && ! strcmp (asmspec
, table
[i
].name
))
892 *pnregs
= table
[i
].nregs
;
893 return table
[i
].number
;
896 #endif /* OVERLAPPING_REGISTER_NAMES */
898 #ifdef ADDITIONAL_REGISTER_NAMES
900 static const struct { const char *const name
; const int number
; } table
[]
901 = ADDITIONAL_REGISTER_NAMES
;
903 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
905 && ! strcmp (asmspec
, table
[i
].name
))
906 return table
[i
].number
;
908 #endif /* ADDITIONAL_REGISTER_NAMES */
910 if (!strcmp (asmspec
, "memory"))
913 if (!strcmp (asmspec
, "cc"))
923 decode_reg_name (const char *name
)
926 return decode_reg_name_and_count (name
, &count
);
930 /* Return true if DECL's initializer is suitable for a BSS section. */
933 bss_initializer_p (const_tree decl
)
935 return (DECL_INITIAL (decl
) == NULL
936 || DECL_INITIAL (decl
) == error_mark_node
937 || (flag_zero_initialized_in_bss
938 /* Leave constant zeroes in .rodata so they
940 && !TREE_READONLY (decl
)
941 && initializer_zerop (DECL_INITIAL (decl
))));
944 /* Compute the alignment of variable specified by DECL.
945 DONT_OUTPUT_DATA is from assemble_variable. */
948 align_variable (tree decl
, bool dont_output_data
)
950 unsigned int align
= DECL_ALIGN (decl
);
952 /* In the case for initialing an array whose length isn't specified,
953 where we have not yet been able to do the layout,
954 figure out the proper alignment now. */
955 if (dont_output_data
&& DECL_SIZE (decl
) == 0
956 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
957 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
959 /* Some object file formats have a maximum alignment which they support.
960 In particular, a.out format supports a maximum alignment of 4. */
961 if (align
> MAX_OFILE_ALIGNMENT
)
963 warning (0, "alignment of %q+D is greater than maximum object "
964 "file alignment. Using %d", decl
,
965 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
966 align
= MAX_OFILE_ALIGNMENT
;
969 /* On some machines, it is good to increase alignment sometimes. */
970 if (! DECL_USER_ALIGN (decl
))
972 #ifdef DATA_ALIGNMENT
973 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
974 /* Don't increase alignment too much for TLS variables - TLS space
976 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
979 #ifdef CONSTANT_ALIGNMENT
980 if (DECL_INITIAL (decl
) != 0 && DECL_INITIAL (decl
) != error_mark_node
)
982 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
984 /* Don't increase alignment too much for TLS variables - TLS space
986 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
992 /* Reset the alignment in case we have made it tighter, so we can benefit
993 from it in get_pointer_alignment. */
994 DECL_ALIGN (decl
) = align
;
997 /* Return the section into which the given VAR_DECL or CONST_DECL
998 should be placed. PREFER_NOSWITCH_P is true if a noswitch
999 section should be used wherever possible. */
1002 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1004 addr_space_t as
= ADDR_SPACE_GENERIC
;
1007 if (TREE_TYPE (decl
) != error_mark_node
)
1008 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1010 if (DECL_COMMON (decl
))
1012 /* If the decl has been given an explicit section name, or it resides
1013 in a non-generic address space, then it isn't common, and shouldn't
1014 be handled as such. */
1015 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1016 && ADDR_SPACE_GENERIC_P (as
));
1017 if (DECL_THREAD_LOCAL_P (decl
))
1018 return tls_comm_section
;
1019 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1020 return comm_section
;
1023 if (DECL_INITIAL (decl
) == error_mark_node
)
1024 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1025 else if (DECL_INITIAL (decl
))
1026 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1030 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1031 if (IN_NAMED_SECTION (decl
))
1032 return get_named_section (decl
, NULL
, reloc
);
1034 if (ADDR_SPACE_GENERIC_P (as
)
1035 && !DECL_THREAD_LOCAL_P (decl
)
1036 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1037 && bss_initializer_p (decl
))
1039 if (!TREE_PUBLIC (decl
)
1040 && !(flag_asan
&& asan_protect_global (decl
)))
1041 return lcomm_section
;
1042 if (bss_noswitch_section
)
1043 return bss_noswitch_section
;
1046 return targetm
.asm_out
.select_section (decl
, reloc
, DECL_ALIGN (decl
));
1049 /* Return the block into which object_block DECL should be placed. */
1051 static struct object_block
*
1052 get_block_for_decl (tree decl
)
1056 if (TREE_CODE (decl
) == VAR_DECL
)
1058 /* The object must be defined in this translation unit. */
1059 if (DECL_EXTERNAL (decl
))
1062 /* There's no point using object blocks for something that is
1063 isolated by definition. */
1064 if (DECL_ONE_ONLY (decl
))
1068 /* We can only calculate block offsets if the decl has a known
1070 if (DECL_SIZE_UNIT (decl
) == NULL
)
1072 if (!host_integerp (DECL_SIZE_UNIT (decl
), 1))
1075 /* Find out which section should contain DECL. We cannot put it into
1076 an object block if it requires a standalone definition. */
1077 if (TREE_CODE (decl
) == VAR_DECL
)
1078 align_variable (decl
, 0);
1079 sect
= get_variable_section (decl
, true);
1080 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1083 return get_block_for_section (sect
);
1086 /* Make sure block symbol SYMBOL is in block BLOCK. */
1089 change_symbol_block (rtx symbol
, struct object_block
*block
)
1091 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1093 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1094 SYMBOL_REF_BLOCK (symbol
) = block
;
1098 /* Return true if it is possible to put DECL in an object_block. */
1101 use_blocks_for_decl_p (tree decl
)
1103 /* Only data DECLs can be placed into object blocks. */
1104 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1107 /* Detect decls created by dw2_force_const_mem. Such decls are
1108 special because DECL_INITIAL doesn't specify the decl's true value.
1109 dw2_output_indirect_constants will instead call assemble_variable
1110 with dont_output_data set to 1 and then print the contents itself. */
1111 if (DECL_INITIAL (decl
) == decl
)
1114 /* If this decl is an alias, then we don't want to emit a
1116 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)))
1119 return targetm
.use_blocks_for_decl_p (decl
);
1122 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1123 have static storage duration. In other words, it should not be an
1124 automatic variable, including PARM_DECLs.
1126 There is, however, one exception: this function handles variables
1127 explicitly placed in a particular register by the user.
1129 This is never called for PARM_DECL nodes. */
1132 make_decl_rtl (tree decl
)
1134 const char *name
= 0;
1138 /* Check that we are not being given an automatic variable. */
1139 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1140 && TREE_CODE (decl
) != RESULT_DECL
);
1142 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1143 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1144 || TREE_STATIC (decl
)
1145 || TREE_PUBLIC (decl
)
1146 || DECL_EXTERNAL (decl
)
1147 || DECL_REGISTER (decl
));
1149 /* And that we were not given a type or a label. */
1150 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1151 && TREE_CODE (decl
) != LABEL_DECL
);
1153 /* For a duplicate declaration, we can be called twice on the
1154 same DECL node. Don't discard the RTL already made. */
1155 if (DECL_RTL_SET_P (decl
))
1157 /* If the old RTL had the wrong mode, fix the mode. */
1158 x
= DECL_RTL (decl
);
1159 if (GET_MODE (x
) != DECL_MODE (decl
))
1160 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1162 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1165 /* ??? Another way to do this would be to maintain a hashed
1166 table of such critters. Instead of adding stuff to a DECL
1167 to give certain attributes to it, we could use an external
1168 hash map from DECL to set of attributes. */
1170 /* Let the target reassign the RTL if it wants.
1171 This is necessary, for example, when one machine specific
1172 decl attribute overrides another. */
1173 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1175 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1176 on the new decl information. */
1178 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1179 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1180 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1182 /* Make this function static known to the mudflap runtime. */
1183 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1184 mudflap_enqueue_decl (decl
);
1189 /* If this variable belongs to the global constant pool, retrieve the
1190 pre-computed RTL or recompute it in LTO mode. */
1191 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_IN_CONSTANT_POOL (decl
))
1193 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1197 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
1199 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1200 && DECL_REGISTER (decl
))
1202 error ("register name not specified for %q+D", decl
);
1204 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1206 const char *asmspec
= name
+1;
1207 enum machine_mode mode
= DECL_MODE (decl
);
1208 reg_number
= decode_reg_name (asmspec
);
1209 /* First detect errors in declaring global registers. */
1210 if (reg_number
== -1)
1211 error ("register name not specified for %q+D", decl
);
1212 else if (reg_number
< 0)
1213 error ("invalid register name for %q+D", decl
);
1214 else if (mode
== BLKmode
)
1215 error ("data type of %q+D isn%'t suitable for a register",
1217 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1218 error ("the register specified for %q+D cannot be accessed"
1219 " by the current target", decl
);
1220 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1221 error ("the register specified for %q+D is not general enough"
1222 " to be used as a register variable", decl
);
1223 else if (!HARD_REGNO_MODE_OK (reg_number
, mode
))
1224 error ("register specified for %q+D isn%'t suitable for data type",
1226 /* Now handle properly declared static register variables. */
1231 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1233 DECL_INITIAL (decl
) = 0;
1234 error ("global register variable has initial value");
1236 if (TREE_THIS_VOLATILE (decl
))
1237 warning (OPT_Wvolatile_register_var
,
1238 "optimization may eliminate reads and/or "
1239 "writes to register variables");
1241 /* If the user specified one of the eliminables registers here,
1242 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1243 confused with that register and be eliminated. This usage is
1244 somewhat suspect... */
1246 SET_DECL_RTL (decl
, gen_rtx_raw_REG (mode
, reg_number
));
1247 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1248 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1250 if (TREE_STATIC (decl
))
1252 /* Make this register global, so not usable for anything
1254 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1255 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1256 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1258 nregs
= hard_regno_nregs
[reg_number
][mode
];
1260 globalize_reg (decl
, reg_number
+ --nregs
);
1263 /* As a register variable, it has no section. */
1267 /* Now handle ordinary static variables and functions (in memory).
1268 Also handle vars declared register invalidly. */
1269 else if (name
[0] == '*')
1271 #ifdef REGISTER_PREFIX
1272 if (strlen (REGISTER_PREFIX
) != 0)
1274 reg_number
= decode_reg_name (name
);
1275 if (reg_number
>= 0 || reg_number
== -3)
1276 error ("register name given for non-register variable %q+D", decl
);
1281 /* Specifying a section attribute on a variable forces it into a
1282 non-.bss section, and thus it cannot be common. */
1283 /* FIXME: In general this code should not be necessary because
1284 visibility pass is doing the same work. But notice_global_symbol
1285 is called early and it needs to make DECL_RTL to get the name.
1286 we take care of recomputing the DECL_RTL after visibility is changed. */
1287 if (TREE_CODE (decl
) == VAR_DECL
1288 && DECL_SECTION_NAME (decl
) != NULL_TREE
1289 && DECL_INITIAL (decl
) == NULL_TREE
1290 && DECL_COMMON (decl
))
1291 DECL_COMMON (decl
) = 0;
1293 /* Variables can't be both common and weak. */
1294 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1295 DECL_COMMON (decl
) = 0;
1297 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1298 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1301 enum machine_mode address_mode
= Pmode
;
1302 if (TREE_TYPE (decl
) != error_mark_node
)
1304 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1305 address_mode
= targetm
.addr_space
.address_mode (as
);
1307 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1309 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1310 SET_SYMBOL_REF_DECL (x
, decl
);
1312 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1313 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1314 set_mem_attributes (x
, decl
, 1);
1315 SET_DECL_RTL (decl
, x
);
1317 /* Optionally set flags or add text to the name to record information
1318 such as that it is a function name.
1319 If the name is changed, the macro ASM_OUTPUT_LABELREF
1320 will have to know how to strip this information. */
1321 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1323 /* Make this function static known to the mudflap runtime. */
1324 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1325 mudflap_enqueue_decl (decl
);
1328 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1329 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1333 make_decl_rtl_for_debug (tree decl
)
1335 unsigned int save_aliasing_flag
, save_mudflap_flag
;
1338 if (DECL_RTL_SET_P (decl
))
1339 return DECL_RTL (decl
);
1341 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1342 call new_alias_set. If running with -fcompare-debug, sometimes
1343 we do not want to create alias sets that will throw the alias
1344 numbers off in the comparison dumps. So... clearing
1345 flag_strict_aliasing will keep new_alias_set() from creating a
1346 new set. It is undesirable to register decl with mudflap
1347 in this case as well. */
1348 save_aliasing_flag
= flag_strict_aliasing
;
1349 flag_strict_aliasing
= 0;
1350 save_mudflap_flag
= flag_mudflap
;
1353 rtl
= DECL_RTL (decl
);
1354 /* Reset DECL_RTL back, as various parts of the compiler expects
1355 DECL_RTL set meaning it is actually going to be output. */
1356 SET_DECL_RTL (decl
, NULL
);
1358 flag_strict_aliasing
= save_aliasing_flag
;
1359 flag_mudflap
= save_mudflap_flag
;
1364 /* Output a string of literal assembler code
1365 for an `asm' keyword used between functions. */
1368 assemble_asm (tree string
)
1373 if (TREE_CODE (string
) == ADDR_EXPR
)
1374 string
= TREE_OPERAND (string
, 0);
1376 p
= TREE_STRING_POINTER (string
);
1377 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1380 /* Write the address of the entity given by SYMBOL to SEC. */
1382 assemble_addr_to_section (rtx symbol
, section
*sec
)
1384 switch_to_section (sec
);
1385 assemble_align (POINTER_SIZE
);
1386 assemble_integer (symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1389 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1390 not) section for PRIORITY. */
1392 get_cdtor_priority_section (int priority
, bool constructor_p
)
1396 /* ??? This only works reliably with the GNU linker. */
1397 sprintf (buf
, "%s.%.5u",
1398 constructor_p
? ".ctors" : ".dtors",
1399 /* Invert the numbering so the linker puts us in the proper
1400 order; constructors are run from right to left, and the
1401 linker sorts in increasing order. */
1402 MAX_INIT_PRIORITY
- priority
);
1403 return get_section (buf
, SECTION_WRITE
, NULL
);
1407 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1411 if (priority
!= DEFAULT_INIT_PRIORITY
)
1412 sec
= get_cdtor_priority_section (priority
,
1413 /*constructor_p=*/false);
1415 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1417 assemble_addr_to_section (symbol
, sec
);
1420 #ifdef DTORS_SECTION_ASM_OP
1422 default_dtor_section_asm_out_destructor (rtx symbol
,
1423 int priority ATTRIBUTE_UNUSED
)
1425 assemble_addr_to_section (symbol
, dtors_section
);
1430 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1434 if (priority
!= DEFAULT_INIT_PRIORITY
)
1435 sec
= get_cdtor_priority_section (priority
,
1436 /*constructor_p=*/true);
1438 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1440 assemble_addr_to_section (symbol
, sec
);
1443 #ifdef CTORS_SECTION_ASM_OP
1445 default_ctor_section_asm_out_constructor (rtx symbol
,
1446 int priority ATTRIBUTE_UNUSED
)
1448 assemble_addr_to_section (symbol
, ctors_section
);
1452 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1453 a nonzero value if the constant pool should be output before the
1454 start of the function, or a zero value if the pool should output
1455 after the end of the function. The default is to put it before the
1458 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1459 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1462 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1463 to be output to assembler.
1464 Set first_global_object_name and weak_global_object_name as appropriate. */
1467 notice_global_symbol (tree decl
)
1469 const char **type
= &first_global_object_name
;
1471 if (first_global_object_name
1472 || !TREE_PUBLIC (decl
)
1473 || DECL_EXTERNAL (decl
)
1474 || !DECL_NAME (decl
)
1475 || (TREE_CODE (decl
) != FUNCTION_DECL
1476 && (TREE_CODE (decl
) != VAR_DECL
1477 || (DECL_COMMON (decl
)
1478 && (DECL_INITIAL (decl
) == 0
1479 || DECL_INITIAL (decl
) == error_mark_node
))))
1480 || !MEM_P (DECL_RTL (decl
)))
1483 /* We win when global object is found, but it is useful to know about weak
1484 symbol as well so we can produce nicer unique names. */
1485 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1486 type
= &weak_global_object_name
;
1492 rtx decl_rtl
= DECL_RTL (decl
);
1494 p
= targetm
.strip_name_encoding (XSTR (XEXP (decl_rtl
, 0), 0));
1495 name
= ggc_strdup (p
);
1501 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1502 current function goes into the cold section, so that targets can use
1503 current_function_section during RTL expansion. DECL describes the
1507 decide_function_section (tree decl
)
1509 first_function_block_is_cold
= false;
1511 if (flag_reorder_blocks_and_partition
)
1512 /* We will decide in assemble_start_function. */
1515 if (DECL_SECTION_NAME (decl
))
1517 struct cgraph_node
*node
= cgraph_get_node (current_function_decl
);
1518 /* Calls to function_section rely on first_function_block_is_cold
1520 first_function_block_is_cold
= (node
1522 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1525 in_cold_section_p
= first_function_block_is_cold
;
1528 /* Output assembler code for the constant pool of a function and associated
1529 with defining the name of the function. DECL describes the function.
1530 NAME is the function's name. For the constant pool, we use the current
1531 constant pool data. */
1534 assemble_start_function (tree decl
, const char *fnname
)
1537 char tmp_label
[100];
1538 bool hot_label_written
= false;
1540 if (flag_reorder_blocks_and_partition
)
1542 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1543 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1544 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1545 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1546 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1547 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1548 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1549 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1554 crtl
->subsections
.hot_section_label
= NULL
;
1555 crtl
->subsections
.cold_section_label
= NULL
;
1556 crtl
->subsections
.hot_section_end_label
= NULL
;
1557 crtl
->subsections
.cold_section_end_label
= NULL
;
1560 /* The following code does not need preprocessing in the assembler. */
1564 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1565 output_constant_pool (fnname
, decl
);
1567 /* Make sure the not and cold text (code) sections are properly
1568 aligned. This is necessary here in the case where the function
1569 has both hot and cold sections, because we don't want to re-set
1570 the alignment when the section switch happens mid-function. */
1572 if (flag_reorder_blocks_and_partition
)
1574 first_function_block_is_cold
= false;
1576 switch_to_section (unlikely_text_section ());
1577 assemble_align (DECL_ALIGN (decl
));
1578 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1580 /* When the function starts with a cold section, we need to explicitly
1581 align the hot section and write out the hot section label.
1582 But if the current function is a thunk, we do not have a CFG. */
1584 && BB_PARTITION (ENTRY_BLOCK_PTR
->next_bb
) == BB_COLD_PARTITION
)
1586 switch_to_section (text_section
);
1587 assemble_align (DECL_ALIGN (decl
));
1588 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1589 hot_label_written
= true;
1590 first_function_block_is_cold
= true;
1592 in_cold_section_p
= first_function_block_is_cold
;
1596 /* Switch to the correct text section for the start of the function. */
1598 switch_to_section (function_section (decl
));
1599 if (flag_reorder_blocks_and_partition
1600 && !hot_label_written
)
1601 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1603 /* Tell assembler to move to target machine's alignment for functions. */
1604 align
= floor_log2 (DECL_ALIGN (decl
) / BITS_PER_UNIT
);
1607 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1610 /* Handle a user-specified function alignment.
1611 Note that we still need to align to DECL_ALIGN, as above,
1612 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1613 if (! DECL_USER_ALIGN (decl
)
1614 && align_functions_log
> align
1615 && optimize_function_for_speed_p (cfun
))
1617 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1618 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1619 align_functions_log
, align_functions
- 1);
1621 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1625 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1626 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1629 if (!DECL_IGNORED_P (decl
))
1630 (*debug_hooks
->begin_function
) (decl
);
1632 /* Make function name accessible from other files, if appropriate. */
1634 if (TREE_PUBLIC (decl
))
1636 notice_global_symbol (decl
);
1638 globalize_decl (decl
);
1640 maybe_assemble_visibility (decl
);
1643 if (DECL_PRESERVE_P (decl
))
1644 targetm
.asm_out
.mark_decl_preserved (fnname
);
1646 /* Do any machine/system dependent processing of the function name. */
1647 #ifdef ASM_DECLARE_FUNCTION_NAME
1648 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1650 /* Standard thing is just output label for the function. */
1651 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1652 #endif /* ASM_DECLARE_FUNCTION_NAME */
1654 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1655 saw_no_split_stack
= true;
1658 /* Output assembler code associated with defining the size of the
1659 function. DECL describes the function. NAME is the function's name. */
1662 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1664 #ifdef ASM_DECLARE_FUNCTION_SIZE
1665 /* We could have switched section in the middle of the function. */
1666 if (flag_reorder_blocks_and_partition
)
1667 switch_to_section (function_section (decl
));
1668 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1670 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1672 output_constant_pool (fnname
, decl
);
1673 switch_to_section (function_section (decl
)); /* need to switch back */
1675 /* Output labels for end of hot/cold text sections (to be used by
1677 if (flag_reorder_blocks_and_partition
)
1679 section
*save_text_section
;
1681 save_text_section
= in_section
;
1682 switch_to_section (unlikely_text_section ());
1683 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1684 if (first_function_block_is_cold
)
1685 switch_to_section (text_section
);
1687 switch_to_section (function_section (decl
));
1688 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1689 switch_to_section (save_text_section
);
1693 /* Assemble code to leave SIZE bytes of zeros. */
1696 assemble_zeros (unsigned HOST_WIDE_INT size
)
1698 /* Do no output if -fsyntax-only. */
1699 if (flag_syntax_only
)
1702 #ifdef ASM_NO_SKIP_IN_TEXT
1703 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1704 so we must output 0s explicitly in the text section. */
1705 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1707 unsigned HOST_WIDE_INT i
;
1708 for (i
= 0; i
< size
; i
++)
1709 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1714 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1717 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1720 assemble_align (int align
)
1722 if (align
> BITS_PER_UNIT
)
1724 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1728 /* Assemble a string constant with the specified C string as contents. */
1731 assemble_string (const char *p
, int size
)
1736 /* If the string is very long, split it up. */
1740 int thissize
= size
- pos
;
1741 if (thissize
> maximum
)
1744 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1752 /* A noswitch_section_callback for lcomm_section. */
1755 emit_local (tree decl ATTRIBUTE_UNUSED
,
1756 const char *name ATTRIBUTE_UNUSED
,
1757 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1758 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1760 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1761 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1762 size
, DECL_ALIGN (decl
));
1764 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1765 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1768 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1773 /* A noswitch_section_callback for bss_noswitch_section. */
1775 #if defined ASM_OUTPUT_ALIGNED_BSS
1777 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1778 const char *name ATTRIBUTE_UNUSED
,
1779 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1780 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1782 #if defined ASM_OUTPUT_ALIGNED_BSS
1783 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
, DECL_ALIGN (decl
));
1789 /* A noswitch_section_callback for comm_section. */
1792 emit_common (tree decl ATTRIBUTE_UNUSED
,
1793 const char *name ATTRIBUTE_UNUSED
,
1794 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1795 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1797 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1798 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1799 size
, DECL_ALIGN (decl
));
1801 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1802 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1805 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1810 /* A noswitch_section_callback for tls_comm_section. */
1813 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1814 const char *name ATTRIBUTE_UNUSED
,
1815 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1816 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1818 #ifdef ASM_OUTPUT_TLS_COMMON
1819 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
1822 sorry ("thread-local COMMON data not implemented");
1827 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1828 NAME is the name of DECL's SYMBOL_REF. */
1831 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
)
1833 unsigned HOST_WIDE_INT size
, rounded
;
1835 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
1838 if (flag_asan
&& asan_protect_global (decl
))
1839 size
+= asan_red_zone_size (size
);
1841 /* Don't allocate zero bytes of common,
1842 since that means "undefined external" in the linker. */
1846 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1847 so that each uninitialized object starts on such a boundary. */
1848 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
1849 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
1850 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
1852 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
1853 && (unsigned HOST_WIDE_INT
) DECL_ALIGN_UNIT (decl
) > rounded
)
1854 warning (0, "requested alignment for %q+D is greater than "
1855 "implemented alignment of %wu", decl
, rounded
);
1858 /* A subroutine of assemble_variable. Output the label and contents of
1859 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1860 is as for assemble_variable. */
1863 assemble_variable_contents (tree decl
, const char *name
,
1864 bool dont_output_data
)
1866 /* Do any machine/system dependent processing of the object. */
1867 #ifdef ASM_DECLARE_OBJECT_NAME
1868 last_assemble_variable_decl
= decl
;
1869 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
1871 /* Standard thing is just output label for the object. */
1872 ASM_OUTPUT_LABEL (asm_out_file
, name
);
1873 #endif /* ASM_DECLARE_OBJECT_NAME */
1875 if (!dont_output_data
)
1877 if (DECL_INITIAL (decl
)
1878 && DECL_INITIAL (decl
) != error_mark_node
1879 && !initializer_zerop (DECL_INITIAL (decl
)))
1880 /* Output the actual data. */
1881 output_constant (DECL_INITIAL (decl
),
1882 tree_low_cst (DECL_SIZE_UNIT (decl
), 1),
1885 /* Leave space for it. */
1886 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl
), 1));
1890 /* Assemble everything that is needed for a variable or function declaration.
1891 Not used for automatic variables, and not used for function definitions.
1892 Should not be called for variables of incomplete structure type.
1894 TOP_LEVEL is nonzero if this variable has file scope.
1895 AT_END is nonzero if this is the special handling, at end of compilation,
1896 to define things that have had only tentative definitions.
1897 DONT_OUTPUT_DATA if nonzero means don't actually output the
1898 initial value (that will be done by the caller). */
1901 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
1902 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
1905 rtx decl_rtl
, symbol
;
1907 bool asan_protected
= false;
1909 /* This function is supposed to handle VARIABLES. Ensure we have one. */
1910 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
1912 /* Emulated TLS had better not get this far. */
1913 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
1915 last_assemble_variable_decl
= 0;
1917 /* Normally no need to say anything here for external references,
1918 since assemble_external is called by the language-specific code
1919 when a declaration is first seen. */
1921 if (DECL_EXTERNAL (decl
))
1924 /* Do nothing for global register variables. */
1925 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
1927 TREE_ASM_WRITTEN (decl
) = 1;
1931 /* If type was incomplete when the variable was declared,
1932 see if it is complete now. */
1934 if (DECL_SIZE (decl
) == 0)
1935 layout_decl (decl
, 0);
1937 /* Still incomplete => don't allocate it; treat the tentative defn
1938 (which is what it must have been) as an `extern' reference. */
1940 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
1942 error ("storage size of %q+D isn%'t known", decl
);
1943 TREE_ASM_WRITTEN (decl
) = 1;
1947 /* The first declaration of a variable that comes through this function
1948 decides whether it is global (in C, has external linkage)
1949 or local (in C, has internal linkage). So do nothing more
1950 if this function has already run. */
1952 if (TREE_ASM_WRITTEN (decl
))
1955 /* Make sure targetm.encode_section_info is invoked before we set
1957 decl_rtl
= DECL_RTL (decl
);
1959 TREE_ASM_WRITTEN (decl
) = 1;
1961 /* Do no output if -fsyntax-only. */
1962 if (flag_syntax_only
)
1965 if (! dont_output_data
1966 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
1968 error ("size of variable %q+D is too large", decl
);
1972 gcc_assert (MEM_P (decl_rtl
));
1973 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
1974 symbol
= XEXP (decl_rtl
, 0);
1976 /* If this symbol belongs to the tree constant pool, output the constant
1977 if it hasn't already been written. */
1978 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
1980 tree decl
= SYMBOL_REF_DECL (symbol
);
1981 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
1982 output_constant_def_contents (symbol
);
1988 name
= XSTR (symbol
, 0);
1989 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
1990 notice_global_symbol (decl
);
1992 /* Compute the alignment of this data. */
1994 align_variable (decl
, dont_output_data
);
1997 && asan_protect_global (decl
))
1999 asan_protected
= true;
2000 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
2001 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
2004 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2006 if (TREE_PUBLIC (decl
))
2007 maybe_assemble_visibility (decl
);
2009 if (DECL_PRESERVE_P (decl
))
2010 targetm
.asm_out
.mark_decl_preserved (name
);
2012 /* First make the assembler name(s) global if appropriate. */
2013 sect
= get_variable_section (decl
, false);
2014 if (TREE_PUBLIC (decl
)
2015 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2016 globalize_decl (decl
);
2018 /* Output any data that we will need to use the address of. */
2019 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2020 output_addressed_constants (DECL_INITIAL (decl
));
2022 /* dbxout.c needs to know this. */
2023 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2024 DECL_IN_TEXT_SECTION (decl
) = 1;
2026 /* If the decl is part of an object_block, make sure that the decl
2027 has been positioned within its block, but do not write out its
2028 definition yet. output_object_blocks will do that later. */
2029 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2031 gcc_assert (!dont_output_data
);
2032 place_block_symbol (symbol
);
2034 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2035 assemble_noswitch_variable (decl
, name
, sect
);
2038 switch_to_section (sect
);
2039 if (DECL_ALIGN (decl
) > BITS_PER_UNIT
)
2040 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (DECL_ALIGN_UNIT (decl
)));
2041 assemble_variable_contents (decl
, name
, dont_output_data
);
2044 unsigned HOST_WIDE_INT
int size
2045 = tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
2046 assemble_zeros (asan_red_zone_size (size
));
2051 /* Return 1 if type TYPE contains any pointers. */
2054 contains_pointers_p (tree type
)
2056 switch (TREE_CODE (type
))
2059 case REFERENCE_TYPE
:
2060 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2061 so I'll play safe and return 1. */
2067 case QUAL_UNION_TYPE
:
2070 /* For a type that has fields, see if the fields have pointers. */
2071 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2072 if (TREE_CODE (fields
) == FIELD_DECL
2073 && contains_pointers_p (TREE_TYPE (fields
)))
2079 /* An array type contains pointers if its element type does. */
2080 return contains_pointers_p (TREE_TYPE (type
));
2087 /* We delay assemble_external processing until
2088 the compilation unit is finalized. This is the best we can do for
2089 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2090 it all the way to final. See PR 17982 for further discussion. */
2091 static GTY(()) tree pending_assemble_externals
;
2093 #ifdef ASM_OUTPUT_EXTERNAL
2094 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2095 As a result, assemble_external can be called after the list of externals
2096 is processed and the pointer set destroyed. */
2097 static bool pending_assemble_externals_processed
;
2099 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2100 TREE_LIST in assemble_external. */
2101 static struct pointer_set_t
*pending_assemble_externals_set
;
2103 /* True if DECL is a function decl for which no out-of-line copy exists.
2104 It is assumed that DECL's assembler name has been set. */
2107 incorporeal_function_p (tree decl
)
2109 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2113 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2114 && (DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
2115 || DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA_WITH_ALIGN
))
2118 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2119 /* Atomic or sync builtins which have survived this far will be
2120 resolved externally and therefore are not incorporeal. */
2121 if (strncmp (name
, "__builtin_", 10) == 0)
2127 /* Actually do the tests to determine if this is necessary, and invoke
2128 ASM_OUTPUT_EXTERNAL. */
2130 assemble_external_real (tree decl
)
2132 rtx rtl
= DECL_RTL (decl
);
2134 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2135 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2136 && !incorporeal_function_p (decl
))
2138 /* Some systems do require some output. */
2139 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2140 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2146 process_pending_assemble_externals (void)
2148 #ifdef ASM_OUTPUT_EXTERNAL
2150 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2151 assemble_external_real (TREE_VALUE (list
));
2153 pending_assemble_externals
= 0;
2154 pending_assemble_externals_processed
= true;
2155 pointer_set_destroy (pending_assemble_externals_set
);
2159 /* This TREE_LIST contains any weak symbol declarations waiting
2161 static GTY(()) tree weak_decls
;
2163 /* Output something to declare an external symbol to the assembler,
2164 and qualifiers such as weakness. (Most assemblers don't need
2165 extern declaration, so we normally output nothing.) Do nothing if
2166 DECL is not external. */
2169 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2171 /* Make sure that the ASM_OUT_FILE is open.
2172 If it's not, we should not be calling this function. */
2173 gcc_assert (asm_out_file
);
2175 /* In a perfect world, the following condition would be true.
2176 Sadly, the Java and Go front ends emit assembly *from the front end*,
2177 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2179 /* This function should only be called if we are expanding, or have
2181 Ideally, only final.c would be calling this function, but it is
2182 not clear whether that would break things somehow. See PR 17982
2183 for further discussion. */
2184 gcc_assert (cgraph_state
== CGRAPH_STATE_EXPANSION
2185 || cgraph_state
== CGRAPH_STATE_FINISHED
);
2188 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2191 /* We want to output annotation for weak and external symbols at
2192 very last to check if they are references or not. */
2194 if (TARGET_SUPPORTS_WEAK
2196 /* TREE_STATIC is a weird and abused creature which is not
2197 generally the right test for whether an entity has been
2198 locally emitted, inlined or otherwise not-really-extern, but
2199 for declarations that can be weak, it happens to be
2201 && !TREE_STATIC (decl
)
2202 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2203 && value_member (decl
, weak_decls
) == NULL_TREE
)
2204 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2206 #ifdef ASM_OUTPUT_EXTERNAL
2207 if (pending_assemble_externals_processed
)
2209 assemble_external_real (decl
);
2213 if (! pointer_set_insert (pending_assemble_externals_set
, decl
))
2214 pending_assemble_externals
= tree_cons (NULL
, decl
,
2215 pending_assemble_externals
);
2219 /* Similar, for calling a library function FUN. */
2222 assemble_external_libcall (rtx fun
)
2224 /* Declare library function name external when first used, if nec. */
2225 if (! SYMBOL_REF_USED (fun
))
2227 SYMBOL_REF_USED (fun
) = 1;
2228 targetm
.asm_out
.external_libcall (fun
);
2232 /* Assemble a label named NAME. */
2235 assemble_label (FILE *file
, const char *name
)
2237 ASM_OUTPUT_LABEL (file
, name
);
2240 /* Set the symbol_referenced flag for ID. */
2242 mark_referenced (tree id
)
2244 TREE_SYMBOL_REFERENCED (id
) = 1;
2247 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2249 mark_decl_referenced (tree decl
)
2251 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2253 /* Extern inline functions don't become needed when referenced.
2254 If we know a method will be emitted in other TU and no new
2255 functions can be marked reachable, just use the external
2257 struct cgraph_node
*node
= cgraph_get_create_node (decl
);
2258 if (!DECL_EXTERNAL (decl
)
2259 && !node
->symbol
.definition
)
2260 cgraph_mark_force_output_node (node
);
2262 else if (TREE_CODE (decl
) == VAR_DECL
)
2264 struct varpool_node
*node
= varpool_node_for_decl (decl
);
2265 /* C++ frontend use mark_decl_references to force COMDAT variables
2266 to be output that might appear dead otherwise. */
2267 node
->symbol
.force_output
= true;
2269 /* else do nothing - we can get various sorts of CST nodes here,
2270 which do not need to be marked. */
2274 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2275 until we find an identifier that is not itself a transparent alias.
2276 Modify the alias passed to it by reference (and all aliases on the
2277 way to the ultimate target), such that they do not have to be
2278 followed again, and return the ultimate target of the alias
2282 ultimate_transparent_alias_target (tree
*alias
)
2284 tree target
= *alias
;
2286 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
2288 gcc_assert (TREE_CHAIN (target
));
2289 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
2290 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
2291 && ! TREE_CHAIN (target
));
2298 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2299 starts with a *, the rest of NAME is output verbatim. Otherwise
2300 NAME is transformed in a target-specific way (usually by the
2301 addition of an underscore). */
2304 assemble_name_raw (FILE *file
, const char *name
)
2307 fputs (&name
[1], file
);
2309 ASM_OUTPUT_LABELREF (file
, name
);
2312 /* Like assemble_name_raw, but should be used when NAME might refer to
2313 an entity that is also represented as a tree (like a function or
2314 variable). If NAME does refer to such an entity, that entity will
2315 be marked as referenced. */
2318 assemble_name (FILE *file
, const char *name
)
2320 const char *real_name
;
2323 real_name
= targetm
.strip_name_encoding (name
);
2325 id
= maybe_get_identifier (real_name
);
2330 mark_referenced (id
);
2331 ultimate_transparent_alias_target (&id
);
2333 name
= IDENTIFIER_POINTER (id
);
2334 gcc_assert (! TREE_CHAIN (id
));
2337 assemble_name_raw (file
, name
);
2340 /* Allocate SIZE bytes writable static space with a gensym name
2341 and return an RTX to refer to its address. */
2344 assemble_static_space (unsigned HOST_WIDE_INT size
)
2347 const char *namestring
;
2350 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2352 namestring
= ggc_strdup (name
);
2354 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2355 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2357 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2358 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2361 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2362 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2365 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2366 so that each uninitialized object starts on such a boundary. */
2367 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2368 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2369 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2370 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2371 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2372 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2379 /* Assemble the static constant template for function entry trampolines.
2380 This is done at most once per compilation.
2381 Returns an RTX for the address of the template. */
2383 static GTY(()) rtx initial_trampoline
;
2386 assemble_trampoline_template (void)
2393 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2395 if (initial_trampoline
)
2396 return initial_trampoline
;
2398 /* By default, put trampoline templates in read-only data section. */
2400 #ifdef TRAMPOLINE_SECTION
2401 switch_to_section (TRAMPOLINE_SECTION
);
2403 switch_to_section (readonly_data_section
);
2406 /* Write the assembler code to define one. */
2407 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2409 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2411 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2412 targetm
.asm_out
.trampoline_template (asm_out_file
);
2414 /* Record the rtl to refer to it. */
2415 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2416 name
= ggc_strdup (label
);
2417 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2418 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2420 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2421 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2422 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2424 return initial_trampoline
;
2427 /* A and B are either alignments or offsets. Return the minimum alignment
2428 that may be assumed after adding the two together. */
2430 static inline unsigned
2431 min_align (unsigned int a
, unsigned int b
)
2433 return (a
| b
) & -(a
| b
);
2436 /* Return the assembler directive for creating a given kind of integer
2437 object. SIZE is the number of bytes in the object and ALIGNED_P
2438 indicates whether it is known to be aligned. Return NULL if the
2439 assembly dialect has no such directive.
2441 The returned string should be printed at the start of a new line and
2442 be followed immediately by the object's initial value. */
2445 integer_asm_op (int size
, int aligned_p
)
2447 struct asm_int_op
*ops
;
2450 ops
= &targetm
.asm_out
.aligned_op
;
2452 ops
= &targetm
.asm_out
.unaligned_op
;
2457 return targetm
.asm_out
.byte_op
;
2471 /* Use directive OP to assemble an integer object X. Print OP at the
2472 start of the line, followed immediately by the value of X. */
2475 assemble_integer_with_op (const char *op
, rtx x
)
2477 fputs (op
, asm_out_file
);
2478 output_addr_const (asm_out_file
, x
);
2479 fputc ('\n', asm_out_file
);
2482 /* The default implementation of the asm_out.integer target hook. */
2485 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2486 unsigned int size ATTRIBUTE_UNUSED
,
2487 int aligned_p ATTRIBUTE_UNUSED
)
2489 const char *op
= integer_asm_op (size
, aligned_p
);
2490 /* Avoid GAS bugs for large values. Specifically negative values whose
2491 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2492 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE
/ BITS_PER_UNIT
)
2494 return op
&& (assemble_integer_with_op (op
, x
), true);
2497 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2498 the alignment of the integer in bits. Return 1 if we were able to output
2499 the constant, otherwise 0. We must be able to output the constant,
2500 if FORCE is nonzero. */
2503 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2507 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2509 /* See if the target hook can handle this kind of object. */
2510 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2513 /* If the object is a multi-byte one, try splitting it up. Split
2514 it into words it if is multi-word, otherwise split it into bytes. */
2517 enum machine_mode omode
, imode
;
2518 unsigned int subalign
;
2519 unsigned int subsize
, i
;
2520 enum mode_class mclass
;
2522 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2523 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2524 if (GET_CODE (x
) == CONST_FIXED
)
2525 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2529 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2530 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2532 for (i
= 0; i
< size
; i
+= subsize
)
2534 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2535 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2541 /* If we've printed some of it, but not all of it, there's no going
2546 gcc_assert (!force
);
2552 assemble_real (REAL_VALUE_TYPE d
, enum machine_mode mode
, unsigned int align
)
2554 long data
[4] = {0, 0, 0, 0};
2556 int bitsize
, nelts
, nunits
, units_per
;
2558 /* This is hairy. We have a quantity of known size. real_to_target
2559 will put it into an array of *host* longs, 32 bits per element
2560 (even if long is more than 32 bits). We need to determine the
2561 number of array elements that are occupied (nelts) and the number
2562 of *target* min-addressable units that will be occupied in the
2563 object file (nunits). We cannot assume that 32 divides the
2564 mode's bitsize (size * BITS_PER_UNIT) evenly.
2566 size * BITS_PER_UNIT is used here to make sure that padding bits
2567 (which might appear at either end of the value; real_to_target
2568 will include the padding bits in its output array) are included. */
2570 nunits
= GET_MODE_SIZE (mode
);
2571 bitsize
= nunits
* BITS_PER_UNIT
;
2572 nelts
= CEIL (bitsize
, 32);
2573 units_per
= 32 / BITS_PER_UNIT
;
2575 real_to_target (data
, &d
, mode
);
2577 /* Put out the first word with the specified alignment. */
2578 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2579 nunits
-= units_per
;
2581 /* Subsequent words need only 32-bit alignment. */
2582 align
= min_align (align
, 32);
2584 for (i
= 1; i
< nelts
; i
++)
2586 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2587 nunits
-= units_per
;
2591 /* Given an expression EXP with a constant value,
2592 reduce it to the sum of an assembler symbol and an integer.
2593 Store them both in the structure *VALUE.
2594 EXP must be reducible. */
2598 HOST_WIDE_INT offset
;
2602 decode_addr_const (tree exp
, struct addr_const
*value
)
2604 tree target
= TREE_OPERAND (exp
, 0);
2610 if (TREE_CODE (target
) == COMPONENT_REF
2611 && host_integerp (byte_position (TREE_OPERAND (target
, 1)), 0))
2613 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2614 target
= TREE_OPERAND (target
, 0);
2616 else if (TREE_CODE (target
) == ARRAY_REF
2617 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2619 offset
+= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target
)), 1)
2620 * tree_low_cst (TREE_OPERAND (target
, 1), 0));
2621 target
= TREE_OPERAND (target
, 0);
2623 else if (TREE_CODE (target
) == MEM_REF
2624 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2626 offset
+= mem_ref_offset (target
).low
;
2627 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2629 else if (TREE_CODE (target
) == INDIRECT_REF
2630 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2631 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2633 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2638 switch (TREE_CODE (target
))
2642 x
= DECL_RTL (target
);
2646 x
= gen_rtx_MEM (FUNCTION_MODE
,
2647 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2656 x
= output_constant_def (target
, 1);
2663 gcc_assert (MEM_P (x
));
2667 value
->offset
= offset
;
2671 static GTY((param_is (struct constant_descriptor_tree
)))
2672 htab_t const_desc_htab
;
2674 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2676 /* Constant pool accessor function. */
2679 constant_pool_htab (void)
2681 return const_desc_htab
;
2684 /* Compute a hash code for a constant expression. */
2687 const_desc_hash (const void *ptr
)
2689 return ((const struct constant_descriptor_tree
*)ptr
)->hash
;
2693 const_hash_1 (const tree exp
)
2698 enum tree_code code
= TREE_CODE (exp
);
2700 /* Either set P and LEN to the address and len of something to hash and
2701 exit the switch or return a value. */
2706 p
= (char *) &TREE_INT_CST (exp
);
2707 len
= sizeof TREE_INT_CST (exp
);
2711 return real_hash (TREE_REAL_CST_PTR (exp
));
2714 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2717 p
= TREE_STRING_POINTER (exp
);
2718 len
= TREE_STRING_LENGTH (exp
);
2722 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2723 + const_hash_1 (TREE_IMAGPART (exp
)));
2729 hi
= 7 + VECTOR_CST_NELTS (exp
);
2731 for (i
= 0; i
< VECTOR_CST_NELTS (exp
); ++i
)
2732 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ELT (exp
, i
));
2739 unsigned HOST_WIDE_INT idx
;
2742 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2744 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2746 hi
= hi
* 603 + const_hash_1 (value
);
2754 struct addr_const value
;
2756 decode_addr_const (exp
, &value
);
2757 switch (GET_CODE (value
.base
))
2760 /* Don't hash the address of the SYMBOL_REF;
2761 only use the offset and the symbol name. */
2763 p
= XSTR (value
.base
, 0);
2764 for (i
= 0; p
[i
] != 0; i
++)
2765 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2769 hi
= value
.offset
+ CODE_LABEL_NUMBER (XEXP (value
.base
, 0)) * 13;
2779 case POINTER_PLUS_EXPR
:
2781 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2782 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2785 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2788 /* A language specific constant. Just hash the code. */
2792 /* Compute hashing function. */
2794 for (i
= 0; i
< len
; i
++)
2795 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2800 /* Wrapper of compare_constant, for the htab interface. */
2802 const_desc_eq (const void *p1
, const void *p2
)
2804 const struct constant_descriptor_tree
*const c1
2805 = (const struct constant_descriptor_tree
*) p1
;
2806 const struct constant_descriptor_tree
*const c2
2807 = (const struct constant_descriptor_tree
*) p2
;
2808 if (c1
->hash
!= c2
->hash
)
2810 return compare_constant (c1
->value
, c2
->value
);
2813 /* Compare t1 and t2, and return 1 only if they are known to result in
2814 the same bit pattern on output. */
2817 compare_constant (const tree t1
, const tree t2
)
2819 enum tree_code typecode
;
2821 if (t1
== NULL_TREE
)
2822 return t2
== NULL_TREE
;
2823 if (t2
== NULL_TREE
)
2826 if (TREE_CODE (t1
) != TREE_CODE (t2
))
2829 switch (TREE_CODE (t1
))
2832 /* Integer constants are the same only if the same width of type. */
2833 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2835 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2837 return tree_int_cst_equal (t1
, t2
);
2840 /* Real constants are the same only if the same width of type. */
2841 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2844 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
2847 /* Fixed constants are the same only if the same width of type. */
2848 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2851 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
2854 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2857 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
2858 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
2859 TREE_STRING_LENGTH (t1
)));
2862 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
2863 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
2869 if (VECTOR_CST_NELTS (t1
) != VECTOR_CST_NELTS (t2
))
2872 for (i
= 0; i
< VECTOR_CST_NELTS (t1
); ++i
)
2873 if (!compare_constant (VECTOR_CST_ELT (t1
, i
),
2874 VECTOR_CST_ELT (t2
, i
)))
2882 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
2883 unsigned HOST_WIDE_INT idx
;
2885 typecode
= TREE_CODE (TREE_TYPE (t1
));
2886 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
2889 if (typecode
== ARRAY_TYPE
)
2891 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
2892 /* For arrays, check that the sizes all match. */
2893 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
2895 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
2900 /* For record and union constructors, require exact type
2902 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
2906 v1
= CONSTRUCTOR_ELTS (t1
);
2907 v2
= CONSTRUCTOR_ELTS (t2
);
2908 if (vec_safe_length (v1
) != vec_safe_length (v2
))
2911 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
2913 constructor_elt
*c1
= &(*v1
)[idx
];
2914 constructor_elt
*c2
= &(*v2
)[idx
];
2916 /* Check that each value is the same... */
2917 if (!compare_constant (c1
->value
, c2
->value
))
2919 /* ... and that they apply to the same fields! */
2920 if (typecode
== ARRAY_TYPE
)
2922 if (!compare_constant (c1
->index
, c2
->index
))
2927 if (c1
->index
!= c2
->index
)
2938 struct addr_const value1
, value2
;
2942 decode_addr_const (t1
, &value1
);
2943 decode_addr_const (t2
, &value2
);
2945 if (value1
.offset
!= value2
.offset
)
2948 code
= GET_CODE (value1
.base
);
2949 if (code
!= GET_CODE (value2
.base
))
2955 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
2959 ret
= (CODE_LABEL_NUMBER (XEXP (value1
.base
, 0))
2960 == CODE_LABEL_NUMBER (XEXP (value2
.base
, 0)));
2970 case POINTER_PLUS_EXPR
:
2973 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
2974 && compare_constant(TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
2977 case VIEW_CONVERT_EXPR
:
2978 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
2987 /* Make a copy of the whole tree structure for a constant. This
2988 handles the same types of nodes that compare_constant handles. */
2991 copy_constant (tree exp
)
2993 switch (TREE_CODE (exp
))
2996 /* For ADDR_EXPR, we do not want to copy the decl whose address
2997 is requested. We do want to copy constants though. */
2998 if (CONSTANT_CLASS_P (TREE_OPERAND (exp
, 0)))
2999 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3000 copy_constant (TREE_OPERAND (exp
, 0)));
3002 return copy_node (exp
);
3008 return copy_node (exp
);
3011 return build_complex (TREE_TYPE (exp
),
3012 copy_constant (TREE_REALPART (exp
)),
3013 copy_constant (TREE_IMAGPART (exp
)));
3016 case POINTER_PLUS_EXPR
:
3018 return build2 (TREE_CODE (exp
), TREE_TYPE (exp
),
3019 copy_constant (TREE_OPERAND (exp
, 0)),
3020 copy_constant (TREE_OPERAND (exp
, 1)));
3023 case VIEW_CONVERT_EXPR
:
3024 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3025 copy_constant (TREE_OPERAND (exp
, 0)));
3028 return build_vector (TREE_TYPE (exp
), VECTOR_CST_ELTS (exp
));
3032 tree copy
= copy_node (exp
);
3033 vec
<constructor_elt
, va_gc
> *v
;
3034 unsigned HOST_WIDE_INT idx
;
3035 tree purpose
, value
;
3037 vec_alloc (v
, vec_safe_length (CONSTRUCTOR_ELTS (exp
)));
3038 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp
), idx
, purpose
, value
)
3040 constructor_elt ce
= {purpose
, copy_constant (value
)};
3043 CONSTRUCTOR_ELTS (copy
) = v
;
3052 /* Return the section into which constant EXP should be placed. */
3055 get_constant_section (tree exp
, unsigned int align
)
3057 return targetm
.asm_out
.select_section (exp
,
3058 compute_reloc_for_constant (exp
),
3062 /* Return the size of constant EXP in bytes. */
3064 static HOST_WIDE_INT
3065 get_constant_size (tree exp
)
3069 size
= int_size_in_bytes (TREE_TYPE (exp
));
3070 if (TREE_CODE (exp
) == STRING_CST
)
3071 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3075 /* Subroutine of output_constant_def:
3076 No constant equal to EXP is known to have been output.
3077 Make a constant descriptor to enter EXP in the hash table.
3078 Assign the label number and construct RTL to refer to the
3079 constant's location in memory.
3080 Caller is responsible for updating the hash table. */
3082 static struct constant_descriptor_tree
*
3083 build_constant_desc (tree exp
)
3085 struct constant_descriptor_tree
*desc
;
3091 desc
= ggc_alloc_constant_descriptor_tree ();
3092 desc
->value
= copy_constant (exp
);
3094 /* Propagate marked-ness to copied constant. */
3095 if (flag_mudflap
&& mf_marked_p (exp
))
3096 mf_mark (desc
->value
);
3098 /* Create a string containing the label name, in LABEL. */
3099 labelno
= const_labelno
++;
3100 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3102 /* Construct the VAR_DECL associated with the constant. */
3103 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3105 DECL_ARTIFICIAL (decl
) = 1;
3106 DECL_IGNORED_P (decl
) = 1;
3107 TREE_READONLY (decl
) = 1;
3108 TREE_STATIC (decl
) = 1;
3109 TREE_ADDRESSABLE (decl
) = 1;
3110 /* We don't set the RTL yet as this would cause varpool to assume that the
3111 variable is referenced. Moreover, it would just be dropped in LTO mode.
3112 Instead we set the flag that will be recognized in make_decl_rtl. */
3113 DECL_IN_CONSTANT_POOL (decl
) = 1;
3114 DECL_INITIAL (decl
) = desc
->value
;
3115 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3116 architectures so use DATA_ALIGNMENT as well, except for strings. */
3117 if (TREE_CODE (exp
) == STRING_CST
)
3119 #ifdef CONSTANT_ALIGNMENT
3120 DECL_ALIGN (decl
) = CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
));
3124 align_variable (decl
, 0);
3126 /* Now construct the SYMBOL_REF and the MEM. */
3127 if (use_object_blocks_p ())
3129 section
*sect
= get_constant_section (exp
, DECL_ALIGN (decl
));
3130 symbol
= create_block_symbol (ggc_strdup (label
),
3131 get_block_for_section (sect
), -1);
3134 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3135 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3136 SET_SYMBOL_REF_DECL (symbol
, decl
);
3137 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3139 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3140 set_mem_attributes (rtl
, exp
, 1);
3141 set_mem_alias_set (rtl
, 0);
3142 set_mem_alias_set (rtl
, const_alias_set
);
3144 /* We cannot share RTX'es in pool entries.
3145 Mark this piece of RTL as required for unsharing. */
3146 RTX_FLAG (rtl
, used
) = 1;
3148 /* Set flags or add text to the name to record information, such as
3149 that it is a local symbol. If the name is changed, the macro
3150 ASM_OUTPUT_LABELREF will have to know how to strip this
3151 information. This call might invalidate our local variable
3152 SYMBOL; we can't use it afterward. */
3153 targetm
.encode_section_info (exp
, rtl
, true);
3160 /* Return an rtx representing a reference to constant data in memory
3161 for the constant expression EXP.
3163 If assembler code for such a constant has already been output,
3164 return an rtx to refer to it.
3165 Otherwise, output such a constant in memory
3166 and generate an rtx for it.
3168 If DEFER is nonzero, this constant can be deferred and output only
3169 if referenced in the function after all optimizations.
3171 `const_desc_table' records which constants already have label strings. */
3174 output_constant_def (tree exp
, int defer
)
3176 struct constant_descriptor_tree
*desc
;
3177 struct constant_descriptor_tree key
;
3180 /* Look up EXP in the table of constant descriptors. If we didn't find
3181 it, create a new one. */
3183 key
.hash
= const_hash_1 (exp
);
3184 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3186 desc
= (struct constant_descriptor_tree
*) *loc
;
3189 desc
= build_constant_desc (exp
);
3190 desc
->hash
= key
.hash
;
3194 maybe_output_constant_def_contents (desc
, defer
);
3198 /* Subroutine of output_constant_def: Decide whether or not we need to
3199 output the constant DESC now, and if so, do it. */
3201 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3204 rtx symbol
= XEXP (desc
->rtl
, 0);
3205 tree exp
= desc
->value
;
3207 if (flag_syntax_only
)
3210 if (TREE_ASM_WRITTEN (exp
))
3211 /* Already output; don't do it again. */
3214 /* We can always defer constants as long as the context allows
3218 /* Increment n_deferred_constants if it exists. It needs to be at
3219 least as large as the number of constants actually referred to
3220 by the function. If it's too small we'll stop looking too early
3221 and fail to emit constants; if it's too large we'll only look
3222 through the entire function when we could have stopped earlier. */
3224 n_deferred_constants
++;
3228 output_constant_def_contents (symbol
);
3231 /* Subroutine of output_constant_def_contents. Output the definition
3232 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3233 constant's alignment in bits. */
3236 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3240 size
= get_constant_size (exp
);
3242 /* Do any machine/system dependent processing of the constant. */
3243 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3245 /* Output the value of EXP. */
3246 output_constant (exp
, size
, align
);
3249 /* We must output the constant data referred to by SYMBOL; do so. */
3252 output_constant_def_contents (rtx symbol
)
3254 tree decl
= SYMBOL_REF_DECL (symbol
);
3255 tree exp
= DECL_INITIAL (decl
);
3257 bool asan_protected
= false;
3259 /* Make sure any other constants whose addresses appear in EXP
3260 are assigned label numbers. */
3261 output_addressed_constants (exp
);
3263 /* We are no longer deferring this constant. */
3264 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3266 if (flag_asan
&& TREE_CODE (exp
) == STRING_CST
3267 && asan_protect_global (exp
))
3269 asan_protected
= true;
3270 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
3271 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
3274 /* If the constant is part of an object block, make sure that the
3275 decl has been positioned within its block, but do not write out
3276 its definition yet. output_object_blocks will do that later. */
3277 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3278 place_block_symbol (symbol
);
3281 align
= DECL_ALIGN (decl
);
3282 switch_to_section (get_constant_section (exp
, align
));
3283 if (align
> BITS_PER_UNIT
)
3284 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3285 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3288 HOST_WIDE_INT size
= get_constant_size (exp
);
3289 assemble_zeros (asan_red_zone_size (size
));
3293 mudflap_enqueue_constant (exp
);
3296 /* Look up EXP in the table of constant descriptors. Return the rtl
3297 if it has been emitted, else null. */
3300 lookup_constant_def (tree exp
)
3302 struct constant_descriptor_tree
*desc
;
3303 struct constant_descriptor_tree key
;
3306 key
.hash
= const_hash_1 (exp
);
3307 desc
= (struct constant_descriptor_tree
*)
3308 htab_find_with_hash (const_desc_htab
, &key
, key
.hash
);
3310 return (desc
? desc
->rtl
: NULL_RTX
);
3313 /* Return a tree representing a reference to constant data in memory
3314 for the constant expression EXP.
3316 This is the counterpart of output_constant_def at the Tree level. */
3319 tree_output_constant_def (tree exp
)
3321 struct constant_descriptor_tree
*desc
, key
;
3325 /* Look up EXP in the table of constant descriptors. If we didn't find
3326 it, create a new one. */
3328 key
.hash
= const_hash_1 (exp
);
3329 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3331 desc
= (struct constant_descriptor_tree
*) *loc
;
3334 desc
= build_constant_desc (exp
);
3335 desc
->hash
= key
.hash
;
3339 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3340 varpool_finalize_decl (decl
);
3344 /* Used in the hash tables to avoid outputting the same constant
3345 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3346 are output once per function, not once per file. */
3347 /* ??? Only a few targets need per-function constant pools. Most
3348 can use one per-file pool. Should add a targetm bit to tell the
3351 struct GTY(()) rtx_constant_pool
{
3352 /* Pointers to first and last constant in pool, as ordered by offset. */
3353 struct constant_descriptor_rtx
*first
;
3354 struct constant_descriptor_rtx
*last
;
3356 /* Hash facility for making memory-constants from constant rtl-expressions.
3357 It is used on RISC machines where immediate integer arguments and
3358 constant addresses are restricted so that such constants must be stored
3360 htab_t
GTY((param_is (struct constant_descriptor_rtx
))) const_rtx_htab
;
3362 /* Current offset in constant pool (does not include any
3363 machine-specific header). */
3364 HOST_WIDE_INT offset
;
3367 struct GTY((chain_next ("%h.next"))) constant_descriptor_rtx
{
3368 struct constant_descriptor_rtx
*next
;
3372 HOST_WIDE_INT offset
;
3374 enum machine_mode mode
;
3380 /* Hash and compare functions for const_rtx_htab. */
3383 const_desc_rtx_hash (const void *ptr
)
3385 const struct constant_descriptor_rtx
*const desc
3386 = (const struct constant_descriptor_rtx
*) ptr
;
3391 const_desc_rtx_eq (const void *a
, const void *b
)
3393 const struct constant_descriptor_rtx
*const x
3394 = (const struct constant_descriptor_rtx
*) a
;
3395 const struct constant_descriptor_rtx
*const y
3396 = (const struct constant_descriptor_rtx
*) b
;
3398 if (x
->mode
!= y
->mode
)
3400 return rtx_equal_p (x
->constant
, y
->constant
);
3403 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3406 const_rtx_hash_1 (rtx
*xp
, void *data
)
3408 unsigned HOST_WIDE_INT hwi
;
3409 enum machine_mode mode
;
3415 code
= GET_CODE (x
);
3416 mode
= GET_MODE (x
);
3417 h
= (hashval_t
) code
* 1048573 + mode
;
3425 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3426 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3429 h
^= (hashval_t
) hwi
;
3430 for (i
= 1; i
< n
; ++i
)
3433 h
^= (hashval_t
) hwi
;
3439 if (mode
== VOIDmode
)
3441 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3445 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3449 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3455 for (i
= XVECLEN (x
, 0); i
-- > 0; )
3456 h
= h
* 251 + const_rtx_hash_1 (&XVECEXP (x
, 0, i
), data
);
3461 h
^= htab_hash_string (XSTR (x
, 0));
3465 h
= h
* 251 + CODE_LABEL_NUMBER (XEXP (x
, 0));
3469 case UNSPEC_VOLATILE
:
3470 h
= h
* 251 + XINT (x
, 1);
3477 hp
= (hashval_t
*) data
;
3478 *hp
= *hp
* 509 + h
;
3482 /* Compute a hash value for X, which should be a constant. */
3485 const_rtx_hash (rtx x
)
3488 for_each_rtx (&x
, const_rtx_hash_1
, &h
);
3493 /* Create and return a new rtx constant pool. */
3495 static struct rtx_constant_pool
*
3496 create_constant_pool (void)
3498 struct rtx_constant_pool
*pool
;
3500 pool
= ggc_alloc_rtx_constant_pool ();
3501 pool
->const_rtx_htab
= htab_create_ggc (31, const_desc_rtx_hash
,
3502 const_desc_rtx_eq
, NULL
);
3509 /* Initialize constant pool hashing for a new function. */
3512 init_varasm_status (void)
3514 crtl
->varasm
.pool
= create_constant_pool ();
3515 crtl
->varasm
.deferred_constants
= 0;
3518 /* Given a MINUS expression, simplify it if both sides
3519 include the same symbol. */
3522 simplify_subtraction (rtx x
)
3524 rtx r
= simplify_rtx (x
);
3528 /* Given a constant rtx X, make (or find) a memory constant for its value
3529 and return a MEM rtx to refer to it in memory. */
3532 force_const_mem (enum machine_mode mode
, rtx x
)
3534 struct constant_descriptor_rtx
*desc
, tmp
;
3535 struct rtx_constant_pool
*pool
;
3542 /* If we're not allowed to drop X into the constant pool, don't. */
3543 if (targetm
.cannot_force_const_mem (mode
, x
))
3546 /* Record that this function has used a constant pool entry. */
3547 crtl
->uses_const_pool
= 1;
3549 /* Decide which pool to use. */
3550 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3551 ? shared_constant_pool
3552 : crtl
->varasm
.pool
);
3554 /* Lookup the value in the hashtable. */
3557 hash
= const_rtx_hash (x
);
3558 slot
= htab_find_slot_with_hash (pool
->const_rtx_htab
, &tmp
, hash
, INSERT
);
3559 desc
= (struct constant_descriptor_rtx
*) *slot
;
3561 /* If the constant was already present, return its memory. */
3563 return copy_rtx (desc
->mem
);
3565 /* Otherwise, create a new descriptor. */
3566 desc
= ggc_alloc_constant_descriptor_rtx ();
3569 /* Align the location counter as required by EXP's data type. */
3570 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3571 #ifdef CONSTANT_ALIGNMENT
3573 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3574 if (type
!= NULL_TREE
)
3575 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3579 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3580 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3583 desc
->constant
= copy_rtx (tmp
.constant
);
3584 desc
->offset
= pool
->offset
;
3587 desc
->align
= align
;
3588 desc
->labelno
= const_labelno
;
3591 pool
->offset
+= GET_MODE_SIZE (mode
);
3593 pool
->last
->next
= desc
;
3595 pool
->first
= pool
->last
= desc
;
3598 /* Create a string containing the label name, in LABEL. */
3599 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3602 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3603 the constants pool. */
3604 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3606 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3607 symbol
= create_block_symbol (ggc_strdup (label
),
3608 get_block_for_section (sect
), -1);
3611 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3613 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3614 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3615 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3617 /* Construct the MEM. */
3618 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3619 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3620 set_mem_align (def
, align
);
3622 /* If we're dropping a label to the constant pool, make sure we
3624 if (GET_CODE (x
) == LABEL_REF
)
3625 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3627 return copy_rtx (def
);
3630 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3633 get_pool_constant (rtx addr
)
3635 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3638 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3639 and whether it has been output or not. */
3642 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3644 struct constant_descriptor_rtx
*desc
;
3646 desc
= SYMBOL_REF_CONSTANT (addr
);
3647 *pmarked
= (desc
->mark
!= 0);
3648 return desc
->constant
;
3651 /* Similar, return the mode. */
3654 get_pool_mode (const_rtx addr
)
3656 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3659 /* Return the size of the constant pool. */
3662 get_pool_size (void)
3664 return crtl
->varasm
.pool
->offset
;
3667 /* Worker function for output_constant_pool_1. Emit assembly for X
3668 in MODE with known alignment ALIGN. */
3671 output_constant_pool_2 (enum machine_mode mode
, rtx x
, unsigned int align
)
3673 switch (GET_MODE_CLASS (mode
))
3676 case MODE_DECIMAL_FLOAT
:
3680 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3681 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3682 assemble_real (r
, mode
, align
);
3687 case MODE_PARTIAL_INT
:
3692 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3695 case MODE_VECTOR_FLOAT
:
3696 case MODE_VECTOR_INT
:
3697 case MODE_VECTOR_FRACT
:
3698 case MODE_VECTOR_UFRACT
:
3699 case MODE_VECTOR_ACCUM
:
3700 case MODE_VECTOR_UACCUM
:
3703 enum machine_mode submode
= GET_MODE_INNER (mode
);
3704 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3706 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3707 units
= CONST_VECTOR_NUNITS (x
);
3709 for (i
= 0; i
< units
; i
++)
3711 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3712 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3722 /* Worker function for output_constant_pool. Emit constant DESC,
3723 giving it ALIGN bits of alignment. */
3726 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3733 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3734 whose CODE_LABEL has been deleted. This can occur if a jump table
3735 is eliminated by optimization. If so, write a constant of zero
3736 instead. Note that this can also happen by turning the
3737 CODE_LABEL into a NOTE. */
3738 /* ??? This seems completely and utterly wrong. Certainly it's
3739 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3740 functioning even with INSN_DELETED_P and friends. */
3743 switch (GET_CODE (tmp
))
3746 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3747 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3749 tmp
= XEXP (XEXP (tmp
, 0), 0);
3753 tmp
= XEXP (tmp
, 0);
3754 gcc_assert (!INSN_DELETED_P (tmp
));
3755 gcc_assert (!NOTE_P (tmp
)
3756 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3763 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3764 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3765 align
, desc
->labelno
, done
);
3768 assemble_align (align
);
3770 /* Output the label. */
3771 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3773 /* Output the data. */
3774 output_constant_pool_2 (desc
->mode
, x
, align
);
3776 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3777 sections have proper size. */
3778 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3780 && (in_section
->common
.flags
& SECTION_MERGE
))
3781 assemble_align (align
);
3783 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3789 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3790 to as used. Emit referenced deferred strings. This function can
3791 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3794 mark_constant (rtx
*current_rtx
, void *data ATTRIBUTE_UNUSED
)
3796 rtx x
= *current_rtx
;
3798 if (x
== NULL_RTX
|| GET_CODE (x
) != SYMBOL_REF
)
3801 if (CONSTANT_POOL_ADDRESS_P (x
))
3803 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3804 if (desc
->mark
== 0)
3807 for_each_rtx (&desc
->constant
, mark_constant
, NULL
);
3810 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3812 tree decl
= SYMBOL_REF_DECL (x
);
3813 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
3815 n_deferred_constants
--;
3816 output_constant_def_contents (x
);
3823 /* Look through appropriate parts of INSN, marking all entries in the
3824 constant pool which are actually being used. Entries that are only
3825 referenced by other constants are also marked as used. Emit
3826 deferred strings that are used. */
3829 mark_constants (rtx insn
)
3834 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3835 insns, not any notes that may be attached. We don't want to mark
3836 a constant just because it happens to appear in a REG_EQUIV note. */
3837 if (GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3839 rtx seq
= PATTERN (insn
);
3840 int i
, n
= XVECLEN (seq
, 0);
3841 for (i
= 0; i
< n
; ++i
)
3843 rtx subinsn
= XVECEXP (seq
, 0, i
);
3844 if (INSN_P (subinsn
))
3845 for_each_rtx (&PATTERN (subinsn
), mark_constant
, NULL
);
3849 for_each_rtx (&PATTERN (insn
), mark_constant
, NULL
);
3852 /* Look through the instructions for this function, and mark all the
3853 entries in POOL which are actually being used. Emit deferred constants
3854 which have indeed been used. */
3857 mark_constant_pool (void)
3861 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
3864 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3865 mark_constants (insn
);
3868 /* Write all the constants in POOL. */
3871 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
3873 struct constant_descriptor_rtx
*desc
;
3875 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3878 /* If the constant is part of an object_block, make sure that
3879 the constant has been positioned within its block, but do not
3880 write out its definition yet. output_object_blocks will do
3882 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
3883 && SYMBOL_REF_BLOCK (desc
->sym
))
3884 place_block_symbol (desc
->sym
);
3887 switch_to_section (targetm
.asm_out
.select_rtx_section
3888 (desc
->mode
, desc
->constant
, desc
->align
));
3889 output_constant_pool_1 (desc
, desc
->align
);
3894 /* Mark all constants that are used in the current function, then write
3895 out the function's private constant pool. */
3898 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
3899 tree fndecl ATTRIBUTE_UNUSED
)
3901 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
3903 /* It is possible for gcc to call force_const_mem and then to later
3904 discard the instructions which refer to the constant. In such a
3905 case we do not need to output the constant. */
3906 mark_constant_pool ();
3908 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3909 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3912 output_constant_pool_contents (pool
);
3914 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3915 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3919 /* Write the contents of the shared constant pool. */
3922 output_shared_constant_pool (void)
3924 output_constant_pool_contents (shared_constant_pool
);
3927 /* Determine what kind of relocations EXP may need. */
3930 compute_reloc_for_constant (tree exp
)
3932 int reloc
= 0, reloc2
;
3935 switch (TREE_CODE (exp
))
3939 /* Go inside any operations that get_inner_reference can handle and see
3940 if what's inside is a constant: no need to do anything here for
3941 addresses of variables or functions. */
3942 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3943 tem
= TREE_OPERAND (tem
, 0))
3946 if (TREE_CODE (tem
) == MEM_REF
3947 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
3949 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
3953 if (TREE_PUBLIC (tem
))
3960 case POINTER_PLUS_EXPR
:
3961 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3962 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3966 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3967 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3968 /* The difference of two local labels is computable at link time. */
3969 if (reloc
== 1 && reloc2
== 1)
3976 case VIEW_CONVERT_EXPR
:
3977 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3982 unsigned HOST_WIDE_INT idx
;
3983 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
3985 reloc
|= compute_reloc_for_constant (tem
);
3995 /* Find all the constants whose addresses are referenced inside of EXP,
3996 and make sure assembler code with a label has been output for each one.
3997 Indicate whether an ADDR_EXPR has been encountered. */
4000 output_addressed_constants (tree exp
)
4004 switch (TREE_CODE (exp
))
4008 /* Go inside any operations that get_inner_reference can handle and see
4009 if what's inside is a constant: no need to do anything here for
4010 addresses of variables or functions. */
4011 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4012 tem
= TREE_OPERAND (tem
, 0))
4015 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4016 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4017 tem
= DECL_INITIAL (tem
);
4019 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4020 output_constant_def (tem
, 0);
4022 if (TREE_CODE (tem
) == MEM_REF
)
4023 output_addressed_constants (TREE_OPERAND (tem
, 0));
4027 case POINTER_PLUS_EXPR
:
4029 output_addressed_constants (TREE_OPERAND (exp
, 1));
4033 case VIEW_CONVERT_EXPR
:
4034 output_addressed_constants (TREE_OPERAND (exp
, 0));
4039 unsigned HOST_WIDE_INT idx
;
4040 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4042 output_addressed_constants (tem
);
4051 /* Whether a constructor CTOR is a valid static constant initializer if all
4052 its elements are. This used to be internal to initializer_constant_valid_p
4053 and has been exposed to let other functions like categorize_ctor_elements
4054 evaluate the property while walking a constructor for other purposes. */
4057 constructor_static_from_elts_p (const_tree ctor
)
4059 return (TREE_CONSTANT (ctor
)
4060 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4061 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4062 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4065 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4068 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4069 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4070 which are valid when ENDTYPE is an integer of any size; in
4071 particular, this does not accept a pointer minus a constant. This
4072 returns null_pointer_node if the VALUE is an absolute constant
4073 which can be used to initialize a static variable. Otherwise it
4077 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4081 if (!INTEGRAL_TYPE_P (endtype
))
4084 op0
= TREE_OPERAND (value
, 0);
4085 op1
= TREE_OPERAND (value
, 1);
4087 /* Like STRIP_NOPS except allow the operand mode to widen. This
4088 works around a feature of fold that simplifies (int)(p1 - p2) to
4089 ((int)p1 - (int)p2) under the theory that the narrower operation
4092 while (CONVERT_EXPR_P (op0
)
4093 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4095 tree inner
= TREE_OPERAND (op0
, 0);
4096 if (inner
== error_mark_node
4097 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4098 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4099 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4104 while (CONVERT_EXPR_P (op1
)
4105 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4107 tree inner
= TREE_OPERAND (op1
, 0);
4108 if (inner
== error_mark_node
4109 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4110 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4111 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4116 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4120 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4121 cache
? cache
+ 2 : NULL
);
4122 /* Both initializers must be known. */
4126 && (op0
== null_pointer_node
4127 || TREE_CODE (value
) == MINUS_EXPR
))
4128 return null_pointer_node
;
4130 /* Support differences between labels. */
4131 if (TREE_CODE (op0
) == LABEL_DECL
4132 && TREE_CODE (op1
) == LABEL_DECL
)
4133 return null_pointer_node
;
4135 if (TREE_CODE (op0
) == STRING_CST
4136 && TREE_CODE (op1
) == STRING_CST
4137 && operand_equal_p (op0
, op1
, 1))
4138 return null_pointer_node
;
4144 /* Helper function of initializer_constant_valid_p.
4145 Return nonzero if VALUE is a valid constant-valued expression
4146 for use in initializing a static variable; one that can be an
4147 element of a "constant" initializer.
4149 Return null_pointer_node if the value is absolute;
4150 if it is relocatable, return the variable that determines the relocation.
4151 We assume that VALUE has been folded as much as possible;
4152 therefore, we do not need to check for such things as
4153 arithmetic-combinations of integers.
4155 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4158 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4162 switch (TREE_CODE (value
))
4165 if (constructor_static_from_elts_p (value
))
4167 unsigned HOST_WIDE_INT idx
;
4169 bool absolute
= true;
4171 if (cache
&& cache
[0] == value
)
4173 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4176 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4183 cache
[1] = NULL_TREE
;
4187 if (reloc
!= null_pointer_node
)
4190 /* For a non-absolute relocation, there is no single
4191 variable that can be "the variable that determines the
4196 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4198 return absolute
? null_pointer_node
: error_mark_node
;
4201 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4209 return null_pointer_node
;
4214 tree op0
= staticp (TREE_OPERAND (value
, 0));
4217 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4218 to be a constant, this is old-skool offsetof-like nonsense. */
4219 if (TREE_CODE (op0
) == INDIRECT_REF
4220 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4221 return null_pointer_node
;
4222 /* Taking the address of a nested function involves a trampoline,
4223 unless we don't need or want one. */
4224 if (TREE_CODE (op0
) == FUNCTION_DECL
4225 && DECL_STATIC_CHAIN (op0
)
4226 && !TREE_NO_TRAMPOLINE (value
))
4228 /* "&{...}" requires a temporary to hold the constructed
4230 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4236 case NON_LVALUE_EXPR
:
4237 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4240 case VIEW_CONVERT_EXPR
:
4242 tree src
= TREE_OPERAND (value
, 0);
4243 tree src_type
= TREE_TYPE (src
);
4244 tree dest_type
= TREE_TYPE (value
);
4246 /* Allow view-conversions from aggregate to non-aggregate type only
4247 if the bit pattern is fully preserved afterwards; otherwise, the
4248 RTL expander won't be able to apply a subsequent transformation
4249 to the underlying constructor. */
4250 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4252 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4253 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4258 /* Allow all other kinds of view-conversion. */
4259 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4264 tree src
= TREE_OPERAND (value
, 0);
4265 tree src_type
= TREE_TYPE (src
);
4266 tree dest_type
= TREE_TYPE (value
);
4268 /* Allow conversions between pointer types, floating-point
4269 types, and offset types. */
4270 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4271 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4272 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4273 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4274 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4276 /* Allow length-preserving conversions between integer types. */
4277 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4278 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4279 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4281 /* Allow conversions between other integer types only if
4283 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4285 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4286 if (inner
== null_pointer_node
)
4287 return null_pointer_node
;
4291 /* Allow (int) &foo provided int is as wide as a pointer. */
4292 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4293 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4294 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4296 /* Likewise conversions from int to pointers, but also allow
4297 conversions from 0. */
4298 if ((POINTER_TYPE_P (dest_type
)
4299 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4300 && INTEGRAL_TYPE_P (src_type
))
4302 if (TREE_CODE (src
) == INTEGER_CST
4303 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4304 return null_pointer_node
;
4305 if (integer_zerop (src
))
4306 return null_pointer_node
;
4307 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4308 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4311 /* Allow conversions to struct or union types if the value
4313 if (TREE_CODE (dest_type
) == RECORD_TYPE
4314 || TREE_CODE (dest_type
) == UNION_TYPE
)
4315 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4319 case POINTER_PLUS_EXPR
:
4321 /* Any valid floating-point constants will have been folded by now;
4322 with -frounding-math we hit this with addition of two constants. */
4323 if (TREE_CODE (endtype
) == REAL_TYPE
)
4325 if (cache
&& cache
[0] == value
)
4327 if (! INTEGRAL_TYPE_P (endtype
)
4328 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4330 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4332 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4335 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4336 endtype
, ncache
+ 2);
4337 /* If either term is absolute, use the other term's relocation. */
4338 if (valid0
== null_pointer_node
)
4340 else if (valid1
== null_pointer_node
)
4342 /* Support narrowing pointer differences. */
4344 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4348 /* Support narrowing pointer differences. */
4349 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4358 if (TREE_CODE (endtype
) == REAL_TYPE
)
4360 if (cache
&& cache
[0] == value
)
4362 if (! INTEGRAL_TYPE_P (endtype
)
4363 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4365 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4367 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4370 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4371 endtype
, ncache
+ 2);
4372 /* Win if second argument is absolute. */
4373 if (valid1
== null_pointer_node
)
4375 /* Win if both arguments have the same relocation.
4376 Then the value is absolute. */
4377 else if (valid0
== valid1
&& valid0
!= 0)
4378 ret
= null_pointer_node
;
4379 /* Since GCC guarantees that string constants are unique in the
4380 generated code, a subtraction between two copies of the same
4381 constant string is absolute. */
4382 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4383 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4384 && operand_equal_p (valid0
, valid1
, 1))
4385 ret
= null_pointer_node
;
4386 /* Support narrowing differences. */
4388 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4392 /* Support narrowing differences. */
4393 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4408 /* Return nonzero if VALUE is a valid constant-valued expression
4409 for use in initializing a static variable; one that can be an
4410 element of a "constant" initializer.
4412 Return null_pointer_node if the value is absolute;
4413 if it is relocatable, return the variable that determines the relocation.
4414 We assume that VALUE has been folded as much as possible;
4415 therefore, we do not need to check for such things as
4416 arithmetic-combinations of integers. */
4418 initializer_constant_valid_p (tree value
, tree endtype
)
4420 return initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4423 /* Return true if VALUE is a valid constant-valued expression
4424 for use in initializing a static bit-field; one that can be
4425 an element of a "constant" initializer. */
4428 initializer_constant_valid_for_bitfield_p (tree value
)
4430 /* For bitfields we support integer constants or possibly nested aggregates
4432 switch (TREE_CODE (value
))
4436 unsigned HOST_WIDE_INT idx
;
4439 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4440 if (!initializer_constant_valid_for_bitfield_p (elt
))
4449 case VIEW_CONVERT_EXPR
:
4450 case NON_LVALUE_EXPR
:
4452 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4461 /* output_constructor outer state of relevance in recursive calls, typically
4462 for nested aggregate bitfields. */
4465 unsigned int bit_offset
; /* current position in ... */
4466 int byte
; /* ... the outer byte buffer. */
4469 static unsigned HOST_WIDE_INT
4470 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int,
4473 /* Output assembler code for constant EXP to FILE, with no label.
4474 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4475 Assumes output_addressed_constants has been done on EXP already.
4477 Generate exactly SIZE bytes of assembler data, padding at the end
4478 with zeros if necessary. SIZE must always be specified.
4480 SIZE is important for structure constructors,
4481 since trailing members may have been omitted from the constructor.
4482 It is also important for initialization of arrays from string constants
4483 since the full length of the string constant might not be wanted.
4484 It is also needed for initialization of unions, where the initializer's
4485 type is just one member, and that may not be as long as the union.
4487 There a case in which we would fail to output exactly SIZE bytes:
4488 for a structure constructor that wants to produce more than SIZE bytes.
4489 But such constructors will never be generated for any possible input.
4491 ALIGN is the alignment of the data in bits. */
4494 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4496 enum tree_code code
;
4497 unsigned HOST_WIDE_INT thissize
;
4499 if (size
== 0 || flag_syntax_only
)
4502 /* See if we're trying to initialize a pointer in a non-default mode
4503 to the address of some declaration somewhere. If the target says
4504 the mode is valid for pointers, assume the target has a way of
4506 if (TREE_CODE (exp
) == NOP_EXPR
4507 && POINTER_TYPE_P (TREE_TYPE (exp
))
4508 && targetm
.addr_space
.valid_pointer_mode
4509 (TYPE_MODE (TREE_TYPE (exp
)),
4510 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4512 tree saved_type
= TREE_TYPE (exp
);
4514 /* Peel off any intermediate conversions-to-pointer for valid
4516 while (TREE_CODE (exp
) == NOP_EXPR
4517 && POINTER_TYPE_P (TREE_TYPE (exp
))
4518 && targetm
.addr_space
.valid_pointer_mode
4519 (TYPE_MODE (TREE_TYPE (exp
)),
4520 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4521 exp
= TREE_OPERAND (exp
, 0);
4523 /* If what we're left with is the address of something, we can
4524 convert the address to the final type and output it that
4526 if (TREE_CODE (exp
) == ADDR_EXPR
)
4527 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4528 /* Likewise for constant ints. */
4529 else if (TREE_CODE (exp
) == INTEGER_CST
)
4530 exp
= build_int_cst_wide (saved_type
, TREE_INT_CST_LOW (exp
),
4531 TREE_INT_CST_HIGH (exp
));
4535 /* Eliminate any conversions since we'll be outputting the underlying
4537 while (CONVERT_EXPR_P (exp
)
4538 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4539 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4541 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4542 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4544 /* Make sure eliminating the conversion is really a no-op, except with
4545 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4546 union types to allow for Ada unchecked unions. */
4547 if (type_size
> op_size
4548 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4549 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4550 /* Keep the conversion. */
4553 exp
= TREE_OPERAND (exp
, 0);
4556 code
= TREE_CODE (TREE_TYPE (exp
));
4557 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4559 /* Allow a constructor with no elements for any data type.
4560 This means to fill the space with zeros. */
4561 if (TREE_CODE (exp
) == CONSTRUCTOR
4562 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4564 assemble_zeros (size
);
4568 if (TREE_CODE (exp
) == FDESC_EXPR
)
4570 #ifdef ASM_OUTPUT_FDESC
4571 HOST_WIDE_INT part
= tree_low_cst (TREE_OPERAND (exp
, 1), 0);
4572 tree decl
= TREE_OPERAND (exp
, 0);
4573 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4580 /* Now output the underlying data. If we've handling the padding, return.
4581 Otherwise, break and ensure SIZE is the size written. */
4588 case REFERENCE_TYPE
:
4590 case FIXED_POINT_TYPE
:
4591 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4592 EXPAND_INITIALIZER
),
4593 MIN (size
, thissize
), align
, 0))
4594 error ("initializer for integer/fixed-point value is too complicated");
4598 if (TREE_CODE (exp
) != REAL_CST
)
4599 error ("initializer for floating value is not a floating constant");
4601 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4605 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4606 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4607 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4612 switch (TREE_CODE (exp
))
4615 output_constructor (exp
, size
, align
, NULL
);
4618 thissize
= MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
),
4620 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4626 unsigned int i
, nalign
;
4627 enum machine_mode inner
;
4629 inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4630 nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4632 elt_size
= GET_MODE_SIZE (inner
);
4634 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
);
4635 thissize
= elt_size
;
4636 for (i
= 1; i
< VECTOR_CST_NELTS (exp
); ++i
)
4638 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
);
4639 thissize
+= elt_size
;
4650 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4651 output_constructor (exp
, size
, align
, NULL
);
4661 if (size
> thissize
)
4662 assemble_zeros (size
- thissize
);
4666 /* Subroutine of output_constructor, used for computing the size of
4667 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4668 type with an unspecified upper bound. */
4670 static unsigned HOST_WIDE_INT
4671 array_size_for_constructor (tree val
)
4674 unsigned HOST_WIDE_INT cnt
;
4675 tree index
, value
, tmp
;
4678 /* This code used to attempt to handle string constants that are not
4679 arrays of single-bytes, but nothing else does, so there's no point in
4681 if (TREE_CODE (val
) == STRING_CST
)
4682 return TREE_STRING_LENGTH (val
);
4684 max_index
= NULL_TREE
;
4685 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4687 if (TREE_CODE (index
) == RANGE_EXPR
)
4688 index
= TREE_OPERAND (index
, 1);
4689 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4693 if (max_index
== NULL_TREE
)
4696 /* Compute the total number of array elements. */
4697 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4698 i
= tree_to_double_int (max_index
) - tree_to_double_int (tmp
);
4699 i
+= double_int_one
;
4701 /* Multiply by the array element unit size to find number of bytes. */
4702 i
*= tree_to_double_int (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4704 gcc_assert (i
.fits_uhwi ());
4708 /* Other datastructures + helpers for output_constructor. */
4710 /* output_constructor local state to support interaction with helpers. */
4714 /* Received arguments. */
4715 tree exp
; /* Constructor expression. */
4716 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4717 unsigned int align
; /* Known initial alignment. */
4719 /* Constructor expression data. */
4720 tree type
; /* Expression type. */
4721 tree field
; /* Current field decl in a record. */
4722 tree min_index
; /* Lower bound if specified for an array. */
4724 /* Output processing state. */
4725 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4726 bool byte_buffer_in_use
; /* Whether byte ... */
4727 int byte
; /* ... contains part of a bitfield byte yet to
4730 int last_relative_index
; /* Implicit or explicit index of the last
4731 array element output within a bitfield. */
4732 /* Current element. */
4733 tree val
; /* Current element value. */
4734 tree index
; /* Current element index. */
4738 /* Helper for output_constructor. From the current LOCAL state, output a
4739 RANGE_EXPR element. */
4742 output_constructor_array_range (oc_local_state
*local
)
4744 unsigned HOST_WIDE_INT fieldsize
4745 = int_size_in_bytes (TREE_TYPE (local
->type
));
4747 HOST_WIDE_INT lo_index
4748 = tree_low_cst (TREE_OPERAND (local
->index
, 0), 0);
4749 HOST_WIDE_INT hi_index
4750 = tree_low_cst (TREE_OPERAND (local
->index
, 1), 0);
4751 HOST_WIDE_INT index
;
4754 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4756 for (index
= lo_index
; index
<= hi_index
; index
++)
4758 /* Output the element's initial value. */
4759 if (local
->val
== NULL_TREE
)
4760 assemble_zeros (fieldsize
);
4762 output_constant (local
->val
, fieldsize
, align2
);
4764 /* Count its size. */
4765 local
->total_bytes
+= fieldsize
;
4769 /* Helper for output_constructor. From the current LOCAL state, output a
4770 field element that is not true bitfield or part of an outer one. */
4773 output_constructor_regular_field (oc_local_state
*local
)
4775 /* Field size and position. Since this structure is static, we know the
4776 positions are constant. */
4777 unsigned HOST_WIDE_INT fieldsize
;
4778 HOST_WIDE_INT fieldpos
;
4780 unsigned int align2
;
4782 if (local
->index
!= NULL_TREE
)
4784 /* Perform the index calculation in modulo arithmetic but
4785 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4786 but we are using an unsigned sizetype. */
4787 unsigned prec
= TYPE_PRECISION (sizetype
);
4788 double_int idx
= tree_to_double_int (local
->index
)
4789 - tree_to_double_int (local
->min_index
);
4790 idx
= idx
.sext (prec
);
4791 fieldpos
= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
)), 1)
4794 else if (local
->field
!= NULL_TREE
)
4795 fieldpos
= int_byte_position (local
->field
);
4799 /* Output any buffered-up bit-fields preceding this element. */
4800 if (local
->byte_buffer_in_use
)
4802 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4803 local
->total_bytes
++;
4804 local
->byte_buffer_in_use
= false;
4807 /* Advance to offset of this element.
4808 Note no alignment needed in an array, since that is guaranteed
4809 if each element has the proper size. */
4810 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4811 && fieldpos
!= local
->total_bytes
)
4813 gcc_assert (fieldpos
>= local
->total_bytes
);
4814 assemble_zeros (fieldpos
- local
->total_bytes
);
4815 local
->total_bytes
= fieldpos
;
4818 /* Find the alignment of this element. */
4819 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
4821 /* Determine size this element should occupy. */
4826 /* If this is an array with an unspecified upper bound,
4827 the initializer determines the size. */
4828 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4829 but we cannot do this until the deprecated support for
4830 initializing zero-length array members is removed. */
4831 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
4832 && TYPE_DOMAIN (TREE_TYPE (local
->field
))
4833 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
))))
4835 fieldsize
= array_size_for_constructor (local
->val
);
4836 /* Given a non-empty initialization, this field had
4838 gcc_assert (!fieldsize
|| !DECL_CHAIN (local
->field
));
4841 fieldsize
= tree_low_cst (DECL_SIZE_UNIT (local
->field
), 1);
4844 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
4846 /* Output the element's initial value. */
4847 if (local
->val
== NULL_TREE
)
4848 assemble_zeros (fieldsize
);
4850 output_constant (local
->val
, fieldsize
, align2
);
4852 /* Count its size. */
4853 local
->total_bytes
+= fieldsize
;
4856 /* Helper for output_constructor. From the current LOCAL and OUTER states,
4857 output an element that is a true bitfield or part of an outer one. */
4860 output_constructor_bitfield (oc_local_state
*local
, oc_outer_state
*outer
)
4862 /* Bit size of this element. */
4863 HOST_WIDE_INT ebitsize
4865 ? tree_low_cst (DECL_SIZE (local
->field
), 1)
4866 : tree_low_cst (TYPE_SIZE (TREE_TYPE (local
->type
)), 1));
4868 /* Relative index of this element if this is an array component. */
4869 HOST_WIDE_INT relative_index
4872 ? (tree_low_cst (local
->index
, 0)
4873 - tree_low_cst (local
->min_index
, 0))
4874 : local
->last_relative_index
+ 1)
4877 /* Bit position of this element from the start of the containing
4879 HOST_WIDE_INT constructor_relative_ebitpos
4881 ? int_bit_position (local
->field
)
4882 : ebitsize
* relative_index
);
4884 /* Bit position of this element from the start of a possibly ongoing
4885 outer byte buffer. */
4886 HOST_WIDE_INT byte_relative_ebitpos
4887 = ((outer
? outer
->bit_offset
: 0) + constructor_relative_ebitpos
);
4889 /* From the start of a possibly ongoing outer byte buffer, offsets to
4890 the first bit of this element and to the first bit past the end of
4892 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
4893 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
4895 local
->last_relative_index
= relative_index
;
4897 if (local
->val
== NULL_TREE
)
4898 local
->val
= integer_zero_node
;
4900 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
4901 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
4902 local
->val
= TREE_OPERAND (local
->val
, 0);
4904 if (TREE_CODE (local
->val
) != INTEGER_CST
4905 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
4907 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
4911 /* If this field does not start in this (or, next) byte,
4913 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4915 /* Output remnant of any bit field in previous bytes. */
4916 if (local
->byte_buffer_in_use
)
4918 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4919 local
->total_bytes
++;
4920 local
->byte_buffer_in_use
= false;
4923 /* If still not at proper byte, advance to there. */
4924 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4926 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
4927 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
4928 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
4932 /* Set up the buffer if necessary. */
4933 if (!local
->byte_buffer_in_use
)
4937 local
->byte_buffer_in_use
= true;
4940 /* If this is nested constructor, recurse passing the bit offset and the
4941 pending data, then retrieve the new pending data afterwards. */
4942 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
4944 oc_outer_state output_state
;
4946 output_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
4947 output_state
.byte
= local
->byte
;
4949 += output_constructor (local
->val
, 0, 0, &output_state
);
4950 local
->byte
= output_state
.byte
;
4954 /* Otherwise, we must split the element into pieces that fall within
4955 separate bytes, and combine each byte with previous or following
4957 while (next_offset
< end_offset
)
4961 HOST_WIDE_INT value
;
4962 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
4963 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
4965 /* Advance from byte to byte
4966 within this element when necessary. */
4967 while (next_byte
!= local
->total_bytes
)
4969 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4970 local
->total_bytes
++;
4974 /* Number of bits we can process at once
4975 (all part of the same byte). */
4976 this_time
= MIN (end_offset
- next_offset
,
4977 BITS_PER_UNIT
- next_bit
);
4978 if (BYTES_BIG_ENDIAN
)
4980 /* On big-endian machine, take the most significant bits
4981 first (of the bits that are significant)
4982 and put them into bytes from the most significant end. */
4983 shift
= end_offset
- next_offset
- this_time
;
4985 /* Don't try to take a bunch of bits that cross
4986 the word boundary in the INTEGER_CST. We can
4987 only select bits from the LOW or HIGH part
4989 if (shift
< HOST_BITS_PER_WIDE_INT
4990 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4992 this_time
= shift
+ this_time
- HOST_BITS_PER_WIDE_INT
;
4993 shift
= HOST_BITS_PER_WIDE_INT
;
4996 /* Now get the bits from the appropriate constant word. */
4997 if (shift
< HOST_BITS_PER_WIDE_INT
)
4998 value
= TREE_INT_CST_LOW (local
->val
);
5001 gcc_assert (shift
< HOST_BITS_PER_DOUBLE_INT
);
5002 value
= TREE_INT_CST_HIGH (local
->val
);
5003 shift
-= HOST_BITS_PER_WIDE_INT
;
5006 /* Get the result. This works only when:
5007 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5008 local
->byte
|= (((value
>> shift
)
5009 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5010 << (BITS_PER_UNIT
- this_time
- next_bit
));
5014 /* On little-endian machines,
5015 take first the least significant bits of the value
5016 and pack them starting at the least significant
5017 bits of the bytes. */
5018 shift
= next_offset
- byte_relative_ebitpos
;
5020 /* Don't try to take a bunch of bits that cross
5021 the word boundary in the INTEGER_CST. We can
5022 only select bits from the LOW or HIGH part
5024 if (shift
< HOST_BITS_PER_WIDE_INT
5025 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
5026 this_time
= (HOST_BITS_PER_WIDE_INT
- shift
);
5028 /* Now get the bits from the appropriate constant word. */
5029 if (shift
< HOST_BITS_PER_WIDE_INT
)
5030 value
= TREE_INT_CST_LOW (local
->val
);
5033 gcc_assert (shift
< HOST_BITS_PER_DOUBLE_INT
);
5034 value
= TREE_INT_CST_HIGH (local
->val
);
5035 shift
-= HOST_BITS_PER_WIDE_INT
;
5038 /* Get the result. This works only when:
5039 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5040 local
->byte
|= (((value
>> shift
)
5041 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5045 next_offset
+= this_time
;
5046 local
->byte_buffer_in_use
= true;
5050 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5051 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5052 caller output state of relevance in recursive invocations. */
5054 static unsigned HOST_WIDE_INT
5055 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
5056 unsigned int align
, oc_outer_state
* outer
)
5058 unsigned HOST_WIDE_INT cnt
;
5059 constructor_elt
*ce
;
5061 oc_local_state local
;
5063 /* Setup our local state to communicate with helpers. */
5066 local
.align
= align
;
5068 local
.total_bytes
= 0;
5069 local
.byte_buffer_in_use
= outer
!= NULL
;
5070 local
.byte
= outer
? outer
->byte
: 0;
5072 local
.type
= TREE_TYPE (exp
);
5074 local
.last_relative_index
= -1;
5076 local
.min_index
= NULL_TREE
;
5077 if (TREE_CODE (local
.type
) == ARRAY_TYPE
5078 && TYPE_DOMAIN (local
.type
) != NULL_TREE
)
5079 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5081 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5083 /* As CE goes through the elements of the constant, FIELD goes through the
5084 structure fields if the constant is a structure. If the constant is a
5085 union, we override this by getting the field from the TREE_LIST element.
5086 But the constant could also be an array. Then FIELD is zero.
5088 There is always a maximum of one element in the chain LINK for unions
5089 (even if the initializer in a source program incorrectly contains
5092 local
.field
= NULL_TREE
;
5093 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5094 local
.field
= TYPE_FIELDS (local
.type
);
5097 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5098 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5100 local
.val
= ce
->value
;
5101 local
.index
= NULL_TREE
;
5103 /* The element in a union constructor specifies the proper field
5105 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5106 local
.field
= ce
->index
;
5108 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5109 local
.index
= ce
->index
;
5111 if (local
.field
&& flag_verbose_asm
)
5112 fprintf (asm_out_file
, "%s %s:\n",
5114 DECL_NAME (local
.field
)
5115 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5118 /* Eliminate the marker that makes a cast not be an lvalue. */
5119 if (local
.val
!= NULL_TREE
)
5120 STRIP_NOPS (local
.val
);
5122 /* Output the current element, using the appropriate helper ... */
5124 /* For an array slice not part of an outer bitfield. */
5126 && local
.index
!= NULL_TREE
5127 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5128 output_constructor_array_range (&local
);
5130 /* For a field that is neither a true bitfield nor part of an outer one,
5131 known to be at least byte aligned and multiple-of-bytes long. */
5133 && (local
.field
== NULL_TREE
5134 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5135 output_constructor_regular_field (&local
);
5137 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5138 supported for scalar fields, so we may need to convert first. */
5141 if (TREE_CODE (local
.val
) == REAL_CST
)
5143 = fold_unary (VIEW_CONVERT_EXPR
,
5144 build_nonstandard_integer_type
5145 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5147 output_constructor_bitfield (&local
, outer
);
5151 /* If we are not at toplevel, save the pending data for our caller.
5152 Otherwise output the pending data and padding zeros as needed. */
5154 outer
->byte
= local
.byte
;
5157 if (local
.byte_buffer_in_use
)
5159 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5160 local
.total_bytes
++;
5163 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5165 assemble_zeros (local
.size
- local
.total_bytes
);
5166 local
.total_bytes
= local
.size
;
5170 return local
.total_bytes
;
5173 /* Mark DECL as weak. */
5176 mark_weak (tree decl
)
5178 DECL_WEAK (decl
) = 1;
5180 if (DECL_RTL_SET_P (decl
)
5181 && MEM_P (DECL_RTL (decl
))
5182 && XEXP (DECL_RTL (decl
), 0)
5183 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5184 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5187 /* Merge weak status between NEWDECL and OLDDECL. */
5190 merge_weak (tree newdecl
, tree olddecl
)
5192 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5194 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5197 /* We put the NEWDECL on the weak_decls list at some point
5198 and OLDDECL as well. Keep just OLDDECL on the list. */
5199 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5200 if (TREE_VALUE (*pwd
) == newdecl
)
5202 *pwd
= TREE_CHAIN (*pwd
);
5209 if (DECL_WEAK (newdecl
))
5213 /* NEWDECL is weak, but OLDDECL is not. */
5215 /* If we already output the OLDDECL, we're in trouble; we can't
5216 go back and make it weak. This should never happen in
5217 unit-at-a-time compilation. */
5218 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5220 /* If we've already generated rtl referencing OLDDECL, we may
5221 have done so in a way that will not function properly with
5222 a weak symbol. Again in unit-at-a-time this should be
5224 gcc_assert (!TREE_USED (olddecl
)
5225 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5227 if (TARGET_SUPPORTS_WEAK
)
5229 /* We put the NEWDECL on the weak_decls list at some point.
5230 Replace it with the OLDDECL. */
5231 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5232 if (TREE_VALUE (wd
) == newdecl
)
5234 TREE_VALUE (wd
) = olddecl
;
5237 /* We may not find the entry on the list. If NEWDECL is a
5238 weak alias, then we will have already called
5239 globalize_decl to remove the entry; in that case, we do
5240 not need to do anything. */
5243 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5244 mark_weak (olddecl
);
5247 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5248 weak. Just update NEWDECL to indicate that it's weak too. */
5249 mark_weak (newdecl
);
5252 /* Declare DECL to be a weak symbol. */
5255 declare_weak (tree decl
)
5257 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5258 if (! TREE_PUBLIC (decl
))
5259 error ("weak declaration of %q+D must be public", decl
);
5260 else if (!TARGET_SUPPORTS_WEAK
)
5261 warning (0, "weak declaration of %q+D not supported", decl
);
5264 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5265 DECL_ATTRIBUTES (decl
)
5266 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5270 weak_finish_1 (tree decl
)
5272 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5273 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5276 if (! TREE_USED (decl
))
5279 #ifdef ASM_WEAKEN_DECL
5280 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5282 #ifdef ASM_WEAKEN_LABEL
5283 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5285 #ifdef ASM_OUTPUT_WEAK_ALIAS
5287 static bool warn_once
= 0;
5290 warning (0, "only weak aliases are supported in this configuration");
5300 /* Fiven an assembly name, find the decl it is associated with. */
5302 find_decl (tree target
)
5304 symtab_node node
= symtab_node_for_asm (target
);
5306 return node
->symbol
.decl
;
5310 /* This TREE_LIST contains weakref targets. */
5312 static GTY(()) tree weakref_targets
;
5314 /* Emit any pending weak declarations. */
5321 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5323 tree alias_decl
= TREE_PURPOSE (t
);
5324 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5326 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5327 /* Remove alias_decl from the weak list, but leave entries for
5328 the target alone. */
5330 #ifndef ASM_OUTPUT_WEAKREF
5331 else if (! TREE_SYMBOL_REFERENCED (target
))
5333 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5334 defined, otherwise we and weak_finish_1 would use
5335 different macros. */
5336 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5337 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5339 tree decl
= find_decl (target
);
5343 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5344 TREE_CODE (alias_decl
), target
,
5345 TREE_TYPE (alias_decl
));
5347 DECL_EXTERNAL (decl
) = 1;
5348 TREE_PUBLIC (decl
) = 1;
5349 DECL_ARTIFICIAL (decl
) = 1;
5350 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5351 TREE_USED (decl
) = 1;
5354 weak_finish_1 (decl
);
5363 /* Remove the alias and the target from the pending weak list
5364 so that we do not emit any .weak directives for the former,
5365 nor multiple .weak directives for the latter. */
5366 for (p
= &weak_decls
; (t2
= *p
) ; )
5368 if (TREE_VALUE (t2
) == alias_decl
5369 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5370 *p
= TREE_CHAIN (t2
);
5372 p
= &TREE_CHAIN (t2
);
5375 /* Remove other weakrefs to the same target, to speed things up. */
5376 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5378 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5379 *p
= TREE_CHAIN (t2
);
5381 p
= &TREE_CHAIN (t2
);
5386 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5388 tree decl
= TREE_VALUE (t
);
5390 weak_finish_1 (decl
);
5394 /* Emit the assembly bits to indicate that DECL is globally visible. */
5397 globalize_decl (tree decl
)
5400 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5401 if (DECL_WEAK (decl
))
5403 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5406 #ifdef ASM_WEAKEN_DECL
5407 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5409 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5412 /* Remove this function from the pending weak list so that
5413 we do not emit multiple .weak directives for it. */
5414 for (p
= &weak_decls
; (t
= *p
) ; )
5416 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5417 *p
= TREE_CHAIN (t
);
5419 p
= &TREE_CHAIN (t
);
5422 /* Remove weakrefs to the same target from the pending weakref
5423 list, for the same reason. */
5424 for (p
= &weakref_targets
; (t
= *p
) ; )
5426 if (DECL_ASSEMBLER_NAME (decl
)
5427 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5428 *p
= TREE_CHAIN (t
);
5430 p
= &TREE_CHAIN (t
);
5437 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5440 vec
<alias_pair
, va_gc
> *alias_pairs
;
5442 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5443 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5444 tree node is DECL to have the value of the tree node TARGET. */
5447 do_assemble_alias (tree decl
, tree target
)
5449 /* Emulated TLS had better not get this var. */
5450 gcc_assert(!(!targetm
.have_tls
5451 && TREE_CODE (decl
) == VAR_DECL
5452 && DECL_THREAD_LOCAL_P (decl
)));
5454 if (TREE_ASM_WRITTEN (decl
))
5457 /* We must force creation of DECL_RTL for debug info generation, even though
5458 we don't use it here. */
5459 make_decl_rtl (decl
);
5461 TREE_ASM_WRITTEN (decl
) = 1;
5462 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5464 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5466 ultimate_transparent_alias_target (&target
);
5468 if (!TREE_SYMBOL_REFERENCED (target
))
5469 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5471 #ifdef ASM_OUTPUT_WEAKREF
5472 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5473 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5474 IDENTIFIER_POINTER (target
));
5476 if (!TARGET_SUPPORTS_WEAK
)
5478 error_at (DECL_SOURCE_LOCATION (decl
),
5479 "weakref is not supported in this configuration");
5486 #ifdef ASM_OUTPUT_DEF
5487 /* Make name accessible from other files, if appropriate. */
5489 if (TREE_PUBLIC (decl
))
5491 globalize_decl (decl
);
5492 maybe_assemble_visibility (decl
);
5494 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5496 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5497 if (targetm
.has_ifunc_p ())
5498 ASM_OUTPUT_TYPE_DIRECTIVE
5499 (asm_out_file
, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5503 error_at (DECL_SOURCE_LOCATION (decl
),
5504 "ifunc is not supported on this target");
5507 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5508 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5510 ASM_OUTPUT_DEF (asm_out_file
,
5511 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5512 IDENTIFIER_POINTER (target
));
5514 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5519 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5520 # ifdef ASM_WEAKEN_DECL
5521 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5523 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5525 /* Remove this function from the pending weak list so that
5526 we do not emit multiple .weak directives for it. */
5527 for (p
= &weak_decls
; (t
= *p
) ; )
5528 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5529 *p
= TREE_CHAIN (t
);
5531 p
= &TREE_CHAIN (t
);
5533 /* Remove weakrefs to the same target from the pending weakref
5534 list, for the same reason. */
5535 for (p
= &weakref_targets
; (t
= *p
) ; )
5537 if (DECL_ASSEMBLER_NAME (decl
)
5538 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5539 *p
= TREE_CHAIN (t
);
5541 p
= &TREE_CHAIN (t
);
5547 /* Emit an assembler directive to make the symbol for DECL an alias to
5548 the symbol for TARGET. */
5551 assemble_alias (tree decl
, tree target
)
5555 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5557 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5559 ultimate_transparent_alias_target (&target
);
5561 if (alias
== target
)
5562 error ("weakref %q+D ultimately targets itself", decl
);
5565 #ifndef ASM_OUTPUT_WEAKREF
5566 IDENTIFIER_TRANSPARENT_ALIAS (alias
) = 1;
5567 TREE_CHAIN (alias
) = target
;
5570 if (TREE_PUBLIC (decl
))
5571 error ("weakref %q+D must have static linkage", decl
);
5575 #if !defined (ASM_OUTPUT_DEF)
5576 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5577 error_at (DECL_SOURCE_LOCATION (decl
),
5578 "alias definitions not supported in this configuration");
5581 if (!DECL_WEAK (decl
))
5583 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5584 error_at (DECL_SOURCE_LOCATION (decl
),
5585 "ifunc is not supported in this configuration");
5587 error_at (DECL_SOURCE_LOCATION (decl
),
5588 "only weak aliases are supported in this configuration");
5594 TREE_USED (decl
) = 1;
5596 /* Allow aliases to aliases. */
5597 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5598 cgraph_get_create_node (decl
)->symbol
.alias
= true;
5600 varpool_node_for_decl (decl
)->symbol
.alias
= true;
5602 /* If the target has already been emitted, we don't have to queue the
5603 alias. This saves a tad of memory. */
5604 if (cgraph_global_info_ready
)
5605 target_decl
= find_decl (target
);
5608 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5609 || cgraph_state
>= CGRAPH_STATE_EXPANSION
)
5610 do_assemble_alias (decl
, target
);
5613 alias_pair p
= {decl
, target
};
5614 vec_safe_push (alias_pairs
, p
);
5618 /* Record and output a table of translations from original function
5619 to its transaction aware clone. Note that tm_pure functions are
5620 considered to be their own clone. */
5622 static GTY((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
5623 htab_t tm_clone_hash
;
5626 record_tm_clone_pair (tree o
, tree n
)
5628 struct tree_map
**slot
, *h
;
5630 if (tm_clone_hash
== NULL
)
5631 tm_clone_hash
= htab_create_ggc (32, tree_map_hash
, tree_map_eq
, 0);
5633 h
= ggc_alloc_tree_map ();
5634 h
->hash
= htab_hash_pointer (o
);
5638 slot
= (struct tree_map
**)
5639 htab_find_slot_with_hash (tm_clone_hash
, h
, h
->hash
, INSERT
);
5644 get_tm_clone_pair (tree o
)
5648 struct tree_map
*h
, in
;
5651 in
.hash
= htab_hash_pointer (o
);
5652 h
= (struct tree_map
*) htab_find_with_hash (tm_clone_hash
,
5660 typedef struct tm_alias_pair
5668 /* Helper function for finish_tm_clone_pairs. Dump a hash table entry
5669 into a VEC in INFO. */
5672 dump_tm_clone_to_vec (void **slot
, void *info
)
5674 struct tree_map
*map
= (struct tree_map
*) *slot
;
5675 vec
<tm_alias_pair
> *tm_alias_pairs
= (vec
<tm_alias_pair
> *) info
;
5676 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5677 tm_alias_pairs
->safe_push (p
);
5681 /* Dump the actual pairs to the .tm_clone_table section. */
5684 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5688 bool switched
= false;
5690 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5694 struct cgraph_node
*src_n
= cgraph_get_node (src
);
5695 struct cgraph_node
*dst_n
= cgraph_get_node (dst
);
5697 /* The function ipa_tm_create_version() marks the clone as needed if
5698 the original function was needed. But we also mark the clone as
5699 needed if we ever called the clone indirectly through
5700 TM_GETTMCLONE. If neither of these are true, we didn't generate
5701 a clone, and we didn't call it indirectly... no sense keeping it
5702 in the clone table. */
5703 if (!dst_n
|| !dst_n
->symbol
.definition
)
5706 /* This covers the case where we have optimized the original
5707 function away, and only access the transactional clone. */
5708 if (!src_n
|| !src_n
->symbol
.definition
)
5713 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5714 assemble_align (POINTER_SIZE
);
5718 assemble_integer (XEXP (DECL_RTL (src
), 0),
5719 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5720 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5721 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5725 /* Provide a default for the tm_clone_table section. */
5728 default_clone_table_section (void)
5730 return get_named_section (NULL
, ".tm_clone_table", 3);
5733 /* Helper comparison function for qsorting by the DECL_UID stored in
5734 alias_pair->emitted_diags. */
5737 tm_alias_pair_cmp (const void *x
, const void *y
)
5739 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5740 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5741 if (p1
->uid
< p2
->uid
)
5743 if (p1
->uid
> p2
->uid
)
5749 finish_tm_clone_pairs (void)
5751 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5753 if (tm_clone_hash
== NULL
)
5756 /* We need a determenistic order for the .tm_clone_table, otherwise
5757 we will get bootstrap comparison failures, so dump the hash table
5758 to a vector, sort it, and dump the vector. */
5760 /* Dump the hashtable to a vector. */
5761 htab_traverse_noresize (tm_clone_hash
, dump_tm_clone_to_vec
,
5762 (void *) &tm_alias_pairs
);
5764 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5767 dump_tm_clone_pairs (tm_alias_pairs
);
5769 htab_delete (tm_clone_hash
);
5770 tm_clone_hash
= NULL
;
5771 tm_alias_pairs
.release ();
5775 /* Emit an assembler directive to set symbol for DECL visibility to
5776 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5779 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5780 int vis ATTRIBUTE_UNUSED
)
5782 #ifdef HAVE_GAS_HIDDEN
5783 static const char * const visibility_types
[] = {
5784 NULL
, "protected", "hidden", "internal"
5787 const char *name
, *type
;
5789 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5790 type
= visibility_types
[vis
];
5792 fprintf (asm_out_file
, "\t.%s\t", type
);
5793 assemble_name (asm_out_file
, name
);
5794 fprintf (asm_out_file
, "\n");
5796 if (!DECL_ARTIFICIAL (decl
))
5797 warning (OPT_Wattributes
, "visibility attribute not supported "
5798 "in this configuration; ignored");
5802 /* A helper function to call assemble_visibility when needed for a decl. */
5805 maybe_assemble_visibility (tree decl
)
5807 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5809 if (vis
!= VISIBILITY_DEFAULT
)
5811 targetm
.asm_out
.assemble_visibility (decl
, vis
);
5818 /* Returns 1 if the target configuration supports defining public symbols
5819 so that one of them will be chosen at link time instead of generating a
5820 multiply-defined symbol error, whether through the use of weak symbols or
5821 a target-specific mechanism for having duplicates discarded. */
5824 supports_one_only (void)
5826 if (SUPPORTS_ONE_ONLY
)
5828 return TARGET_SUPPORTS_WEAK
;
5831 /* Set up DECL as a public symbol that can be defined in multiple
5832 translation units without generating a linker error. */
5835 make_decl_one_only (tree decl
, tree comdat_group
)
5837 gcc_assert (TREE_CODE (decl
) == VAR_DECL
5838 || TREE_CODE (decl
) == FUNCTION_DECL
);
5840 TREE_PUBLIC (decl
) = 1;
5842 if (SUPPORTS_ONE_ONLY
)
5844 #ifdef MAKE_DECL_ONE_ONLY
5845 MAKE_DECL_ONE_ONLY (decl
);
5847 DECL_COMDAT_GROUP (decl
) = comdat_group
;
5849 else if (TREE_CODE (decl
) == VAR_DECL
5850 && (DECL_INITIAL (decl
) == 0 || DECL_INITIAL (decl
) == error_mark_node
))
5851 DECL_COMMON (decl
) = 1;
5854 gcc_assert (TARGET_SUPPORTS_WEAK
);
5855 DECL_WEAK (decl
) = 1;
5860 init_varasm_once (void)
5862 section_htab
= htab_create_ggc (31, section_entry_hash
,
5863 section_entry_eq
, NULL
);
5864 object_block_htab
= htab_create_ggc (31, object_block_entry_hash
,
5865 object_block_entry_eq
, NULL
);
5866 const_desc_htab
= htab_create_ggc (1009, const_desc_hash
,
5867 const_desc_eq
, NULL
);
5869 const_alias_set
= new_alias_set ();
5870 shared_constant_pool
= create_constant_pool ();
5872 #ifdef TEXT_SECTION_ASM_OP
5873 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
5874 TEXT_SECTION_ASM_OP
);
5877 #ifdef DATA_SECTION_ASM_OP
5878 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5879 DATA_SECTION_ASM_OP
);
5882 #ifdef SDATA_SECTION_ASM_OP
5883 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5884 SDATA_SECTION_ASM_OP
);
5887 #ifdef READONLY_DATA_SECTION_ASM_OP
5888 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
5889 READONLY_DATA_SECTION_ASM_OP
);
5892 #ifdef CTORS_SECTION_ASM_OP
5893 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
5894 CTORS_SECTION_ASM_OP
);
5897 #ifdef DTORS_SECTION_ASM_OP
5898 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
5899 DTORS_SECTION_ASM_OP
);
5902 #ifdef BSS_SECTION_ASM_OP
5903 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5904 output_section_asm_op
,
5905 BSS_SECTION_ASM_OP
);
5908 #ifdef SBSS_SECTION_ASM_OP
5909 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5910 output_section_asm_op
,
5911 SBSS_SECTION_ASM_OP
);
5914 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5915 | SECTION_COMMON
, emit_tls_common
);
5916 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5917 | SECTION_COMMON
, emit_local
);
5918 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5919 | SECTION_COMMON
, emit_common
);
5921 #if defined ASM_OUTPUT_ALIGNED_BSS
5922 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
5926 targetm
.asm_out
.init_sections ();
5928 if (readonly_data_section
== NULL
)
5929 readonly_data_section
= text_section
;
5931 #ifdef ASM_OUTPUT_EXTERNAL
5932 pending_assemble_externals_set
= pointer_set_create ();
5937 decl_default_tls_model (const_tree decl
)
5939 enum tls_model kind
;
5942 is_local
= targetm
.binds_local_p (decl
);
5946 kind
= TLS_MODEL_LOCAL_EXEC
;
5948 kind
= TLS_MODEL_INITIAL_EXEC
;
5951 /* Local dynamic is inefficient when we're not combining the
5952 parts of the address. */
5953 else if (optimize
&& is_local
)
5954 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
5956 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
5957 if (kind
< flag_tls_default
)
5958 kind
= flag_tls_default
;
5963 /* Select a set of attributes for section NAME based on the properties
5964 of DECL and whether or not RELOC indicates that DECL's initializer
5965 might contain runtime relocations.
5967 We make the section read-only and executable for a function decl,
5968 read-only for a const data decl, and writable for a non-const data decl. */
5971 default_section_type_flags (tree decl
, const char *name
, int reloc
)
5975 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
5976 flags
= SECTION_CODE
;
5979 enum section_category category
5980 = categorize_decl_for_section (decl
, reloc
);
5981 if (decl_readonly_section_1 (category
))
5983 else if (category
== SECCAT_DATA_REL_RO
5984 || category
== SECCAT_DATA_REL_RO_LOCAL
)
5985 flags
= SECTION_WRITE
| SECTION_RELRO
;
5987 flags
= SECTION_WRITE
;
5991 flags
= SECTION_WRITE
;
5992 if (strcmp (name
, ".data.rel.ro") == 0
5993 || strcmp (name
, ".data.rel.ro.local") == 0)
5994 flags
|= SECTION_RELRO
;
5997 if (decl
&& DECL_P (decl
) && DECL_ONE_ONLY (decl
))
5998 flags
|= SECTION_LINKONCE
;
6000 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6001 flags
|= SECTION_TLS
| SECTION_WRITE
;
6003 if (strcmp (name
, ".bss") == 0
6004 || strncmp (name
, ".bss.", 5) == 0
6005 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6006 || strcmp (name
, ".sbss") == 0
6007 || strncmp (name
, ".sbss.", 6) == 0
6008 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6009 flags
|= SECTION_BSS
;
6011 if (strcmp (name
, ".tdata") == 0
6012 || strncmp (name
, ".tdata.", 7) == 0
6013 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6014 flags
|= SECTION_TLS
;
6016 if (strcmp (name
, ".tbss") == 0
6017 || strncmp (name
, ".tbss.", 6) == 0
6018 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6019 flags
|= SECTION_TLS
| SECTION_BSS
;
6021 /* These three sections have special ELF types. They are neither
6022 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6023 want to print a section type (@progbits or @nobits). If someone
6024 is silly enough to emit code or TLS variables to one of these
6025 sections, then don't handle them specially. */
6026 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6027 && (strcmp (name
, ".init_array") == 0
6028 || strcmp (name
, ".fini_array") == 0
6029 || strcmp (name
, ".preinit_array") == 0))
6030 flags
|= SECTION_NOTYPE
;
6035 /* Return true if the target supports some form of global BSS,
6036 either through bss_noswitch_section, or by selecting a BSS
6037 section in TARGET_ASM_SELECT_SECTION. */
6040 have_global_bss_p (void)
6042 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6045 /* Output assembly to switch to section NAME with attribute FLAGS.
6046 Four variants for common object file formats. */
6049 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6050 unsigned int flags ATTRIBUTE_UNUSED
,
6051 tree decl ATTRIBUTE_UNUSED
)
6053 /* Some object formats don't support named sections at all. The
6054 front-end should already have flagged this as an error. */
6058 #ifndef TLS_SECTION_ASM_FLAG
6059 #define TLS_SECTION_ASM_FLAG 'T'
6063 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6064 tree decl ATTRIBUTE_UNUSED
)
6066 char flagchars
[10], *f
= flagchars
;
6068 /* If we have already declared this section, we can use an
6069 abbreviated form to switch back to it -- unless this section is
6070 part of a COMDAT groups, in which case GAS requires the full
6071 declaration every time. */
6072 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6073 && (flags
& SECTION_DECLARED
))
6075 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6079 if (!(flags
& SECTION_DEBUG
))
6081 if (flags
& SECTION_EXCLUDE
)
6083 if (flags
& SECTION_WRITE
)
6085 if (flags
& SECTION_CODE
)
6087 if (flags
& SECTION_SMALL
)
6089 if (flags
& SECTION_MERGE
)
6091 if (flags
& SECTION_STRINGS
)
6093 if (flags
& SECTION_TLS
)
6094 *f
++ = TLS_SECTION_ASM_FLAG
;
6095 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6099 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6101 if (!(flags
& SECTION_NOTYPE
))
6106 if (flags
& SECTION_BSS
)
6112 /* On platforms that use "@" as the assembly comment character,
6114 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6116 fprintf (asm_out_file
, format
, type
);
6118 if (flags
& SECTION_ENTSIZE
)
6119 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6120 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6122 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6123 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6125 fprintf (asm_out_file
, ",%s,comdat",
6126 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6130 putc ('\n', asm_out_file
);
6134 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6135 tree decl ATTRIBUTE_UNUSED
)
6137 char flagchars
[8], *f
= flagchars
;
6139 if (flags
& SECTION_WRITE
)
6141 if (flags
& SECTION_CODE
)
6145 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6149 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6152 default_coff_asm_named_section (name
, flags
, decl
);
6154 if (flags
& SECTION_LINKONCE
)
6156 /* Functions may have been compiled at various levels of
6157 optimization so we can't use `same_size' here.
6158 Instead, have the linker pick one. */
6159 fprintf (asm_out_file
, "\t.linkonce %s\n",
6160 (flags
& SECTION_CODE
? "discard" : "same_size"));
6164 /* The lame default section selector. */
6167 default_select_section (tree decl
, int reloc
,
6168 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6172 if (decl_readonly_section (decl
, reloc
))
6173 return readonly_data_section
;
6175 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6177 if (! ((flag_pic
&& reloc
)
6178 || !TREE_READONLY (decl
)
6179 || TREE_SIDE_EFFECTS (decl
)
6180 || !TREE_CONSTANT (decl
)))
6181 return readonly_data_section
;
6183 else if (TREE_CODE (decl
) == STRING_CST
)
6184 return readonly_data_section
;
6185 else if (! (flag_pic
&& reloc
))
6186 return readonly_data_section
;
6188 return data_section
;
6191 enum section_category
6192 categorize_decl_for_section (const_tree decl
, int reloc
)
6194 enum section_category ret
;
6196 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6198 else if (TREE_CODE (decl
) == STRING_CST
)
6201 || (flag_asan
&& asan_protect_global (CONST_CAST_TREE (decl
))))
6202 /* or !flag_merge_constants */
6203 return SECCAT_RODATA
;
6205 return SECCAT_RODATA_MERGE_STR
;
6207 else if (TREE_CODE (decl
) == VAR_DECL
)
6209 if (bss_initializer_p (decl
))
6211 else if (! TREE_READONLY (decl
)
6212 || TREE_SIDE_EFFECTS (decl
)
6213 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6215 /* Here the reloc_rw_mask is not testing whether the section should
6216 be read-only or not, but whether the dynamic link will have to
6217 do something. If so, we wish to segregate the data in order to
6218 minimize cache misses inside the dynamic linker. */
6219 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6220 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6224 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6225 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6226 else if (reloc
|| flag_merge_constants
< 2 || flag_mudflap
6227 || (flag_asan
&& asan_protect_global (CONST_CAST_TREE (decl
))))
6228 /* C and C++ don't allow different variables to share the same
6229 location. -fmerge-all-constants allows even that (at the
6230 expense of not conforming). */
6231 ret
= SECCAT_RODATA
;
6232 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6233 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6235 ret
= SECCAT_RODATA_MERGE_CONST
;
6237 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6239 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6240 || TREE_SIDE_EFFECTS (decl
)
6241 || ! TREE_CONSTANT (decl
))
6244 ret
= SECCAT_RODATA
;
6247 ret
= SECCAT_RODATA
;
6249 /* There are no read-only thread-local sections. */
6250 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6252 /* Note that this would be *just* SECCAT_BSS, except that there's
6253 no concept of a read-only thread-local-data section. */
6254 if (ret
== SECCAT_BSS
6255 || (flag_zero_initialized_in_bss
6256 && initializer_zerop (DECL_INITIAL (decl
))))
6262 /* If the target uses small data sections, select it. */
6263 else if (targetm
.in_small_data_p (decl
))
6265 if (ret
== SECCAT_BSS
)
6267 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6268 ret
= SECCAT_SRODATA
;
6277 decl_readonly_section_1 (enum section_category category
)
6282 case SECCAT_RODATA_MERGE_STR
:
6283 case SECCAT_RODATA_MERGE_STR_INIT
:
6284 case SECCAT_RODATA_MERGE_CONST
:
6285 case SECCAT_SRODATA
:
6293 decl_readonly_section (const_tree decl
, int reloc
)
6295 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6298 /* Select a section based on the above categorization. */
6301 default_elf_select_section (tree decl
, int reloc
,
6302 unsigned HOST_WIDE_INT align
)
6305 switch (categorize_decl_for_section (decl
, reloc
))
6308 /* We're not supposed to be called on FUNCTION_DECLs. */
6311 return readonly_data_section
;
6312 case SECCAT_RODATA_MERGE_STR
:
6313 return mergeable_string_section (decl
, align
, 0);
6314 case SECCAT_RODATA_MERGE_STR_INIT
:
6315 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6316 case SECCAT_RODATA_MERGE_CONST
:
6317 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6318 case SECCAT_SRODATA
:
6322 return data_section
;
6323 case SECCAT_DATA_REL
:
6324 sname
= ".data.rel";
6326 case SECCAT_DATA_REL_LOCAL
:
6327 sname
= ".data.rel.local";
6329 case SECCAT_DATA_REL_RO
:
6330 sname
= ".data.rel.ro";
6332 case SECCAT_DATA_REL_RO_LOCAL
:
6333 sname
= ".data.rel.ro.local";
6356 return get_named_section (decl
, sname
, reloc
);
6359 /* Construct a unique section name based on the decl name and the
6360 categorization performed above. */
6363 default_unique_section (tree decl
, int reloc
)
6365 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6366 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6367 const char *prefix
, *name
, *linkonce
;
6370 switch (categorize_decl_for_section (decl
, reloc
))
6373 prefix
= one_only
? ".t" : ".text";
6376 case SECCAT_RODATA_MERGE_STR
:
6377 case SECCAT_RODATA_MERGE_STR_INIT
:
6378 case SECCAT_RODATA_MERGE_CONST
:
6379 prefix
= one_only
? ".r" : ".rodata";
6381 case SECCAT_SRODATA
:
6382 prefix
= one_only
? ".s2" : ".sdata2";
6385 prefix
= one_only
? ".d" : ".data";
6387 case SECCAT_DATA_REL
:
6388 prefix
= one_only
? ".d.rel" : ".data.rel";
6390 case SECCAT_DATA_REL_LOCAL
:
6391 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6393 case SECCAT_DATA_REL_RO
:
6394 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6396 case SECCAT_DATA_REL_RO_LOCAL
:
6397 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6400 prefix
= one_only
? ".s" : ".sdata";
6403 prefix
= one_only
? ".b" : ".bss";
6406 prefix
= one_only
? ".sb" : ".sbss";
6409 prefix
= one_only
? ".td" : ".tdata";
6412 prefix
= one_only
? ".tb" : ".tbss";
6418 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
6419 name
= targetm
.strip_name_encoding (name
);
6421 /* If we're using one_only, then there needs to be a .gnu.linkonce
6422 prefix to the section name. */
6423 linkonce
= one_only
? ".gnu.linkonce" : "";
6425 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6427 DECL_SECTION_NAME (decl
) = build_string (strlen (string
), string
);
6430 /* Like compute_reloc_for_constant, except for an RTX. The return value
6431 is a mask for which bit 1 indicates a global relocation, and bit 0
6432 indicates a local relocation. */
6435 compute_reloc_for_rtx_1 (rtx
*xp
, void *data
)
6437 int *preloc
= (int *) data
;
6440 switch (GET_CODE (x
))
6443 *preloc
|= SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6456 compute_reloc_for_rtx (rtx x
)
6460 switch (GET_CODE (x
))
6466 for_each_rtx (&x
, compute_reloc_for_rtx_1
, &reloc
);
6475 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
6477 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6479 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6480 return data_section
;
6482 return readonly_data_section
;
6486 default_elf_select_rtx_section (enum machine_mode mode
, rtx x
,
6487 unsigned HOST_WIDE_INT align
)
6489 int reloc
= compute_reloc_for_rtx (x
);
6491 /* ??? Handle small data here somehow. */
6493 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6496 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6498 return get_named_section (NULL
, ".data.rel.ro", 3);
6501 return mergeable_constant_section (mode
, align
, 0);
6504 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6507 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6512 /* Careful not to prod global register variables. */
6515 symbol
= XEXP (rtl
, 0);
6516 if (GET_CODE (symbol
) != SYMBOL_REF
)
6519 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6520 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6521 flags
|= SYMBOL_FLAG_FUNCTION
;
6522 if (targetm
.binds_local_p (decl
))
6523 flags
|= SYMBOL_FLAG_LOCAL
;
6524 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6525 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6526 else if (targetm
.in_small_data_p (decl
))
6527 flags
|= SYMBOL_FLAG_SMALL
;
6528 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6529 being PUBLIC, the thing *must* be defined in this translation unit.
6530 Prevent this buglet from being propagated into rtl code as well. */
6531 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6532 flags
|= SYMBOL_FLAG_EXTERNAL
;
6534 SYMBOL_REF_FLAGS (symbol
) = flags
;
6537 /* By default, we do nothing for encode_section_info, so we need not
6538 do anything but discard the '*' marker. */
6541 default_strip_name_encoding (const char *str
)
6543 return str
+ (*str
== '*');
6546 #ifdef ASM_OUTPUT_DEF
6547 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6548 anchor relative to ".", the current section position. */
6551 default_asm_output_anchor (rtx symbol
)
6555 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6556 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6557 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6561 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6564 default_use_anchors_for_symbol_p (const_rtx symbol
)
6569 /* Don't use anchors for mergeable sections. The linker might move
6570 the objects around. */
6571 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6572 if (sect
->common
.flags
& SECTION_MERGE
)
6575 /* Don't use anchors for small data sections. The small data register
6576 acts as an anchor for such sections. */
6577 if (sect
->common
.flags
& SECTION_SMALL
)
6580 decl
= SYMBOL_REF_DECL (symbol
);
6581 if (decl
&& DECL_P (decl
))
6583 /* Don't use section anchors for decls that might be defined or
6584 usurped by other modules. */
6585 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
6588 /* Don't use section anchors for decls that will be placed in a
6589 small data section. */
6590 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6591 one above. The problem is that we only use SECTION_SMALL for
6592 sections that should be marked as small in the section directive. */
6593 if (targetm
.in_small_data_p (decl
))
6599 /* Return true when RESOLUTION indicate that symbol will be bound to the
6600 definition provided by current .o file. */
6603 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6605 return (resolution
== LDPR_PREVAILING_DEF
6606 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6607 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6610 /* Return true when RESOLUTION indicate that symbol will be bound locally
6611 within current executable or DSO. */
6614 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6616 return (resolution
== LDPR_PREVAILING_DEF
6617 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6618 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6619 || resolution
== LDPR_PREEMPTED_REG
6620 || resolution
== LDPR_PREEMPTED_IR
6621 || resolution
== LDPR_RESOLVED_IR
6622 || resolution
== LDPR_RESOLVED_EXEC
);
6625 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6626 wrt cross-module name binding. */
6629 default_binds_local_p (const_tree exp
)
6631 return default_binds_local_p_1 (exp
, flag_shlib
);
6635 default_binds_local_p_1 (const_tree exp
, int shlib
)
6638 bool resolved_locally
= false;
6639 bool resolved_to_local_def
= false;
6641 /* With resolution file in hands, take look into resolutions.
6642 We can't just return true for resolved_locally symbols,
6643 because dynamic linking might overwrite symbols
6644 in shared libraries. */
6645 if (TREE_CODE (exp
) == VAR_DECL
&& TREE_PUBLIC (exp
)
6646 && (TREE_STATIC (exp
) || DECL_EXTERNAL (exp
)))
6648 struct varpool_node
*vnode
= varpool_get_node (exp
);
6649 if (vnode
&& resolution_local_p (vnode
->symbol
.resolution
))
6650 resolved_locally
= true;
6652 && resolution_to_local_definition_p (vnode
->symbol
.resolution
))
6653 resolved_to_local_def
= true;
6655 else if (TREE_CODE (exp
) == FUNCTION_DECL
&& TREE_PUBLIC (exp
))
6657 struct cgraph_node
*node
= cgraph_get_node (exp
);
6659 && resolution_local_p (node
->symbol
.resolution
))
6660 resolved_locally
= true;
6662 && resolution_to_local_definition_p (node
->symbol
.resolution
))
6663 resolved_to_local_def
= true;
6666 /* A non-decl is an entry in the constant pool. */
6669 /* Weakrefs may not bind locally, even though the weakref itself is always
6670 static and therefore local. Similarly, the resolver for ifunc functions
6671 might resolve to a non-local function.
6672 FIXME: We can resolve the weakref case more curefuly by looking at the
6674 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6675 || (TREE_CODE (exp
) == FUNCTION_DECL
6676 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6678 /* Static variables are always local. */
6679 else if (! TREE_PUBLIC (exp
))
6681 /* A variable is local if the user has said explicitly that it will
6683 else if ((DECL_VISIBILITY_SPECIFIED (exp
)
6684 || resolved_to_local_def
)
6685 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6687 /* Variables defined outside this object might not be local. */
6688 else if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6690 /* If defined in this object and visibility is not default, must be
6692 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6694 /* Default visibility weak data can be overridden by a strong symbol
6695 in another module and so are not local. */
6696 else if (DECL_WEAK (exp
)
6697 && !resolved_locally
)
6699 /* If PIC, then assume that any global name can be overridden by
6700 symbols resolved from other modules. */
6703 /* Uninitialized COMMON variable may be unified with symbols
6704 resolved from other modules. */
6705 else if (DECL_COMMON (exp
)
6706 && !resolved_locally
6707 && (DECL_INITIAL (exp
) == NULL
6708 || DECL_INITIAL (exp
) == error_mark_node
))
6710 /* Otherwise we're left with initialized (or non-common) global data
6711 which is of necessity defined locally. */
6718 /* Return true when references to DECL must bind to current definition in
6721 The condition is usually equivalent to whether the function binds to the
6722 current module (shared library or executable), that is to binds_local_p.
6723 We use this fact to avoid need for another target hook and implement
6724 the logic using binds_local_p and just special cases where
6725 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6726 the weak definitions (that can be overwritten at linktime by other
6727 definition from different object file) and when resolution info is available
6728 we simply use the knowledge passed to us by linker plugin. */
6730 decl_binds_to_current_def_p (tree decl
)
6732 gcc_assert (DECL_P (decl
));
6733 if (!TREE_PUBLIC (decl
))
6735 if (!targetm
.binds_local_p (decl
))
6737 /* When resolution is available, just use it. */
6738 if (TREE_CODE (decl
) == VAR_DECL
6739 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)))
6741 struct varpool_node
*vnode
= varpool_get_node (decl
);
6743 && vnode
->symbol
.resolution
!= LDPR_UNKNOWN
)
6744 return resolution_to_local_definition_p (vnode
->symbol
.resolution
);
6746 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
6748 struct cgraph_node
*node
= cgraph_get_node (decl
);
6750 && node
->symbol
.resolution
!= LDPR_UNKNOWN
)
6751 return resolution_to_local_definition_p (node
->symbol
.resolution
);
6753 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6754 binds locally but still can be overwritten).
6755 This rely on fact that binds_local_p behave as decl_replaceable_p
6756 for all other declaration types. */
6757 return !DECL_WEAK (decl
);
6760 /* A replaceable function or variable is one which may be replaced
6761 at link-time with an entirely different definition, provided that the
6762 replacement has the same type. For example, functions declared
6763 with __attribute__((weak)) on most systems are replaceable.
6765 COMDAT functions are not replaceable, since all definitions of the
6766 function must be equivalent. It is important that COMDAT functions
6767 not be treated as replaceable so that use of C++ template
6768 instantiations is not penalized. */
6771 decl_replaceable_p (tree decl
)
6773 gcc_assert (DECL_P (decl
));
6774 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
6776 return !decl_binds_to_current_def_p (decl
);
6779 /* Default function to output code that will globalize a label. A
6780 target must define GLOBAL_ASM_OP or provide its own function to
6781 globalize a label. */
6782 #ifdef GLOBAL_ASM_OP
6784 default_globalize_label (FILE * stream
, const char *name
)
6786 fputs (GLOBAL_ASM_OP
, stream
);
6787 assemble_name (stream
, name
);
6788 putc ('\n', stream
);
6790 #endif /* GLOBAL_ASM_OP */
6792 /* Default function to output code that will globalize a declaration. */
6794 default_globalize_decl_name (FILE * stream
, tree decl
)
6796 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6797 targetm
.asm_out
.globalize_label (stream
, name
);
6800 /* Default function to output a label for unwind information. The
6801 default is to do nothing. A target that needs nonlocal labels for
6802 unwind information must provide its own function to do this. */
6804 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6805 tree decl ATTRIBUTE_UNUSED
,
6806 int for_eh ATTRIBUTE_UNUSED
,
6807 int empty ATTRIBUTE_UNUSED
)
6811 /* Default function to output a label to divide up the exception table.
6812 The default is to do nothing. A target that needs/wants to divide
6813 up the table must provide it's own function to do this. */
6815 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
6819 /* This is how to output an internal numbered label where PREFIX is
6820 the class of label and LABELNO is the number within the class. */
6823 default_generate_internal_label (char *buf
, const char *prefix
,
6824 unsigned long labelno
)
6826 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6829 /* This is how to output an internal numbered label where PREFIX is
6830 the class of label and LABELNO is the number within the class. */
6833 default_internal_label (FILE *stream
, const char *prefix
,
6834 unsigned long labelno
)
6836 char *const buf
= (char *) alloca (40 + strlen (prefix
));
6837 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6838 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
6842 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
6845 default_asm_declare_constant_name (FILE *file
, const char *name
,
6846 const_tree exp ATTRIBUTE_UNUSED
,
6847 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
6849 assemble_label (file
, name
);
6852 /* This is the default behavior at the beginning of a file. It's
6853 controlled by two other target-hook toggles. */
6855 default_file_start (void)
6857 if (targetm
.asm_file_start_app_off
6858 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
6859 fputs (ASM_APP_OFF
, asm_out_file
);
6861 if (targetm
.asm_file_start_file_directive
)
6862 output_file_directive (asm_out_file
, main_input_filename
);
6865 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6866 which emits a special section directive used to indicate whether or
6867 not this object file needs an executable stack. This is primarily
6868 a GNU extension to ELF but could be used on other targets. */
6870 int trampolines_created
;
6873 file_end_indicate_exec_stack (void)
6875 unsigned int flags
= SECTION_DEBUG
;
6876 if (trampolines_created
)
6877 flags
|= SECTION_CODE
;
6879 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
6882 /* Emit a special section directive to indicate that this object file
6883 was compiled with -fsplit-stack. This is used to let the linker
6884 detect calls between split-stack code and non-split-stack code, so
6885 that it can modify the split-stack code to allocate a sufficiently
6886 large stack. We emit another special section if there are any
6887 functions in this file which have the no_split_stack attribute, to
6888 prevent the linker from warning about being unable to convert the
6889 functions if they call non-split-stack code. */
6892 file_end_indicate_split_stack (void)
6894 if (flag_split_stack
)
6896 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
6898 if (saw_no_split_stack
)
6899 switch_to_section (get_section (".note.GNU-no-split-stack",
6900 SECTION_DEBUG
, NULL
));
6904 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6905 a get_unnamed_section callback. */
6908 output_section_asm_op (const void *directive
)
6910 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
6913 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6914 the current section is NEW_SECTION. */
6917 switch_to_section (section
*new_section
)
6919 if (in_section
== new_section
)
6922 if (new_section
->common
.flags
& SECTION_FORGET
)
6925 in_section
= new_section
;
6927 switch (SECTION_STYLE (new_section
))
6930 targetm
.asm_out
.named_section (new_section
->named
.name
,
6931 new_section
->named
.common
.flags
,
6932 new_section
->named
.decl
);
6935 case SECTION_UNNAMED
:
6936 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
6939 case SECTION_NOSWITCH
:
6944 new_section
->common
.flags
|= SECTION_DECLARED
;
6947 /* If block symbol SYMBOL has not yet been assigned an offset, place
6948 it at the end of its block. */
6951 place_block_symbol (rtx symbol
)
6953 unsigned HOST_WIDE_INT size
, mask
, offset
;
6954 struct constant_descriptor_rtx
*desc
;
6955 unsigned int alignment
;
6956 struct object_block
*block
;
6959 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
6960 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
6963 /* Work out the symbol's size and alignment. */
6964 if (CONSTANT_POOL_ADDRESS_P (symbol
))
6966 desc
= SYMBOL_REF_CONSTANT (symbol
);
6967 alignment
= desc
->align
;
6968 size
= GET_MODE_SIZE (desc
->mode
);
6970 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
6972 decl
= SYMBOL_REF_DECL (symbol
);
6973 alignment
= DECL_ALIGN (decl
);
6974 size
= get_constant_size (DECL_INITIAL (decl
));
6976 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
6977 && asan_protect_global (DECL_INITIAL (decl
)))
6978 size
+= asan_red_zone_size (size
);
6982 decl
= SYMBOL_REF_DECL (symbol
);
6983 alignment
= DECL_ALIGN (decl
);
6984 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
6985 if (flag_asan
&& asan_protect_global (decl
))
6987 size
+= asan_red_zone_size (size
);
6988 alignment
= MAX (alignment
,
6989 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
6993 /* Calculate the object's offset from the start of the block. */
6994 block
= SYMBOL_REF_BLOCK (symbol
);
6995 mask
= alignment
/ BITS_PER_UNIT
- 1;
6996 offset
= (block
->size
+ mask
) & ~mask
;
6997 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
6999 /* Record the block's new alignment and size. */
7000 block
->alignment
= MAX (block
->alignment
, alignment
);
7001 block
->size
= offset
+ size
;
7003 vec_safe_push (block
->objects
, symbol
);
7006 /* Return the anchor that should be used to address byte offset OFFSET
7007 from the first object in BLOCK. MODEL is the TLS model used
7011 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7012 enum tls_model model
)
7015 unsigned int begin
, middle
, end
;
7016 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7019 /* Work out the anchor's offset. Use an offset of 0 for the first
7020 anchor so that we don't pessimize the case where we take the address
7021 of a variable at the beginning of the block. This is particularly
7022 useful when a block has only one variable assigned to it.
7024 We try to place anchors RANGE bytes apart, so there can then be
7025 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7026 a ptr_mode offset. With some target settings, the lowest such
7027 anchor might be out of range for the lowest ptr_mode offset;
7028 likewise the highest anchor for the highest offset. Use anchors
7029 at the extreme ends of the ptr_mode range in such cases.
7031 All arithmetic uses unsigned integers in order to avoid
7033 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7034 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7035 range
= max_offset
- min_offset
+ 1;
7040 bias
= 1 << (GET_MODE_BITSIZE (ptr_mode
) - 1);
7043 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7044 delta
-= delta
% range
;
7047 offset
= (HOST_WIDE_INT
) (-delta
);
7051 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7052 delta
-= delta
% range
;
7053 if (delta
> bias
- 1)
7055 offset
= (HOST_WIDE_INT
) delta
;
7059 /* Do a binary search to see if there's already an anchor we can use.
7060 Set BEGIN to the new anchor's index if not. */
7062 end
= vec_safe_length (block
->anchors
);
7063 while (begin
!= end
)
7065 middle
= (end
+ begin
) / 2;
7066 anchor
= (*block
->anchors
)[middle
];
7067 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7069 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7071 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7073 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7079 /* Create a new anchor with a unique label. */
7080 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7081 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7082 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7083 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7085 /* Insert it at index BEGIN. */
7086 vec_safe_insert (block
->anchors
, begin
, anchor
);
7090 /* Output the objects in BLOCK. */
7093 output_object_block (struct object_block
*block
)
7095 struct constant_descriptor_rtx
*desc
;
7097 HOST_WIDE_INT offset
;
7101 if (!block
->objects
)
7104 /* Switch to the section and make sure that the first byte is
7105 suitably aligned. */
7106 switch_to_section (block
->sect
);
7107 assemble_align (block
->alignment
);
7109 /* Define the values of all anchors relative to the current section
7111 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7112 targetm
.asm_out
.output_anchor (symbol
);
7114 /* Output the objects themselves. */
7116 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7118 /* Move to the object's offset, padding with zeros if necessary. */
7119 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7120 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7121 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7123 desc
= SYMBOL_REF_CONSTANT (symbol
);
7124 output_constant_pool_1 (desc
, 1);
7125 offset
+= GET_MODE_SIZE (desc
->mode
);
7127 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7130 decl
= SYMBOL_REF_DECL (symbol
);
7131 assemble_constant_contents (DECL_INITIAL (decl
), XSTR (symbol
, 0),
7133 size
= get_constant_size (DECL_INITIAL (decl
));
7136 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7137 && asan_protect_global (DECL_INITIAL (decl
)))
7139 size
= asan_red_zone_size (size
);
7140 assemble_zeros (size
);
7147 decl
= SYMBOL_REF_DECL (symbol
);
7148 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7149 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
7151 if (flag_asan
&& asan_protect_global (decl
))
7153 size
= asan_red_zone_size (size
);
7154 assemble_zeros (size
);
7161 /* A htab_traverse callback used to call output_object_block for
7162 each member of object_block_htab. */
7165 output_object_block_htab (void **slot
, void *data ATTRIBUTE_UNUSED
)
7167 output_object_block ((struct object_block
*) (*slot
));
7171 /* Output the definitions of all object_blocks. */
7174 output_object_blocks (void)
7176 htab_traverse (object_block_htab
, output_object_block_htab
, NULL
);
7179 /* This function provides a possible implementation of the
7180 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7181 by -frecord-gcc-switches it creates a new mergeable, string section in the
7182 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7183 contains the switches in ASCII format.
7185 FIXME: This code does not correctly handle double quote characters
7186 that appear inside strings, (it strips them rather than preserving them).
7187 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7188 characters - instead it treats them as sub-string separators. Since
7189 we want to emit NUL strings terminators into the object file we have to use
7193 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7197 case SWITCH_TYPE_PASSED
:
7198 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7199 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7202 case SWITCH_TYPE_DESCRIPTIVE
:
7205 /* Distinguish between invocations where name is NULL. */
7206 static bool started
= false;
7212 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7216 | (SECTION_ENTSIZE
& 1),
7218 switch_to_section (sec
);
7227 /* The return value is currently ignored by the caller, but must be 0.
7228 For -fverbose-asm the return value would be the number of characters
7229 emitted into the assembler file. */
7233 /* Emit text to declare externally defined symbols. It is needed to
7234 properly support non-default visibility. */
7236 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7238 const char *name ATTRIBUTE_UNUSED
)
7240 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7241 set in order to avoid putting out names that are never really
7243 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7244 && targetm
.binds_local_p (decl
))
7245 maybe_assemble_visibility (decl
);
7248 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7251 default_asm_output_source_filename (FILE *file
, const char *name
)
7253 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7254 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7256 fprintf (file
, "\t.file\t");
7257 output_quoted_string (file
, name
);
7262 /* Output a file name in the form wanted by System V. */
7265 output_file_directive (FILE *asm_file
, const char *input_name
)
7270 if (input_name
== NULL
)
7271 input_name
= "<stdin>";
7273 input_name
= remap_debug_filename (input_name
);
7275 len
= strlen (input_name
);
7276 na
= input_name
+ len
;
7278 /* NA gets INPUT_NAME sans directory names. */
7279 while (na
> input_name
)
7281 if (IS_DIR_SEPARATOR (na
[-1]))
7286 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7289 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7292 make_debug_expr_from_rtl (const_rtx exp
)
7294 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7295 enum machine_mode mode
= GET_MODE (exp
);
7298 DECL_ARTIFICIAL (ddecl
) = 1;
7299 if (REG_P (exp
) && REG_EXPR (exp
))
7300 type
= TREE_TYPE (REG_EXPR (exp
));
7301 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7302 type
= TREE_TYPE (MEM_EXPR (exp
));
7305 if (type
&& TYPE_MODE (type
) == mode
)
7306 TREE_TYPE (ddecl
) = type
;
7308 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7309 DECL_MODE (ddecl
) = mode
;
7310 dval
= gen_rtx_DEBUG_EXPR (mode
);
7311 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7312 SET_DECL_RTL (ddecl
, dval
);
7316 #ifdef ELF_ASCII_ESCAPES
7317 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7320 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7325 fputs (STRING_ASM_OP
, f
);
7330 escape
= ELF_ASCII_ESCAPES
[c
];
7337 /* TODO: Print in hex with fast function, important for -flto. */
7338 fprintf (f
, "\\%03o", c
);
7351 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7354 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7356 const char *limit
= s
+ len
;
7357 const char *last_null
= NULL
;
7358 unsigned bytes_in_chunk
= 0;
7362 for (; s
< limit
; s
++)
7366 if (bytes_in_chunk
>= 60)
7375 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7382 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7384 if (bytes_in_chunk
> 0)
7391 default_elf_asm_output_limited_string (f
, s
);
7396 if (bytes_in_chunk
== 0)
7397 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7400 escape
= ELF_ASCII_ESCAPES
[c
];
7408 /* TODO: Print in hex with fast function, important for -flto. */
7409 fprintf (f
, "\\%03o", c
);
7410 bytes_in_chunk
+= 4;
7415 bytes_in_chunk
+= 2;
7422 if (bytes_in_chunk
> 0)
7430 static GTY(()) section
*elf_init_array_section
;
7431 static GTY(()) section
*elf_fini_array_section
;
7434 get_elf_initfini_array_priority_section (int priority
,
7438 if (priority
!= DEFAULT_INIT_PRIORITY
)
7441 sprintf (buf
, "%s.%.5u",
7442 constructor_p
? ".init_array" : ".fini_array",
7444 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7450 if (elf_init_array_section
== NULL
)
7451 elf_init_array_section
7452 = get_section (".init_array",
7453 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7454 sec
= elf_init_array_section
;
7458 if (elf_fini_array_section
== NULL
)
7459 elf_fini_array_section
7460 = get_section (".fini_array",
7461 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7462 sec
= elf_fini_array_section
;
7468 /* Use .init_array section for constructors. */
7471 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7473 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7475 assemble_addr_to_section (symbol
, sec
);
7478 /* Use .fini_array section for destructors. */
7481 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7483 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7485 assemble_addr_to_section (symbol
, sec
);
7488 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7490 This is a bit of a cheat. The real default is a no-op, but this
7491 hook is the default for all targets with a .ident directive. */
7494 default_asm_output_ident_directive (const char *ident_str
)
7496 const char *ident_asm_op
= "\t.ident\t";
7498 /* If we are still in the front end, do not write out the string
7499 to asm_out_file. Instead, add a fake top-level asm statement.
7500 This allows the front ends to use this hook without actually
7501 writing to asm_out_file, to handle #ident or Pragma Ident. */
7502 if (cgraph_state
== CGRAPH_STATE_PARSING
)
7504 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7505 add_asm_node (build_string (strlen (buf
), buf
));
7508 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7511 #include "gt-varasm.h"