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 if (! DECL_USER_ALIGN (decl
))
971 #ifdef DATA_ABI_ALIGNMENT
972 unsigned int data_abi_align
973 = DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
974 /* For backwards compatibility, don't assume the ABI alignment for
976 if (! DECL_THREAD_LOCAL_P (decl
) || data_abi_align
<= BITS_PER_WORD
)
977 align
= data_abi_align
;
980 /* On some machines, it is good to increase alignment sometimes.
981 But as DECL_ALIGN is used both for actually emitting the variable
982 and for code accessing the variable as guaranteed alignment, we
983 can only increase the alignment if it is a performance optimization
984 if the references to it must bind to the current definition. */
985 if (decl_binds_to_current_def_p (decl
))
987 #ifdef DATA_ALIGNMENT
988 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
989 /* Don't increase alignment too much for TLS variables - TLS space
991 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
994 #ifdef CONSTANT_ALIGNMENT
995 if (DECL_INITIAL (decl
) != 0
996 && DECL_INITIAL (decl
) != error_mark_node
)
998 unsigned int const_align
999 = CONSTANT_ALIGNMENT (DECL_INITIAL (decl
), align
);
1000 /* Don't increase alignment too much for TLS variables - TLS
1001 space is too precious. */
1002 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1003 align
= const_align
;
1009 /* Reset the alignment in case we have made it tighter, so we can benefit
1010 from it in get_pointer_alignment. */
1011 DECL_ALIGN (decl
) = align
;
1014 /* Return DECL_ALIGN (decl), possibly increased for optimization purposes
1015 beyond what align_variable returned. */
1018 get_variable_align (tree decl
)
1020 unsigned int align
= DECL_ALIGN (decl
);
1022 /* For user aligned vars or static vars align_variable already did
1024 if (DECL_USER_ALIGN (decl
) || !TREE_PUBLIC (decl
))
1027 #ifdef DATA_ABI_ALIGNMENT
1028 if (DECL_THREAD_LOCAL_P (decl
))
1029 align
= DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1032 /* For decls that bind to the current definition, align_variable
1033 did also everything, except for not assuming ABI required alignment
1034 of TLS variables. For other vars, increase the alignment here
1035 as an optimization. */
1036 if (!decl_binds_to_current_def_p (decl
))
1038 /* On some machines, it is good to increase alignment sometimes. */
1039 #ifdef DATA_ALIGNMENT
1040 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1041 /* Don't increase alignment too much for TLS variables - TLS space
1043 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1046 #ifdef CONSTANT_ALIGNMENT
1047 if (DECL_INITIAL (decl
) != 0 && DECL_INITIAL (decl
) != error_mark_node
)
1049 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
1051 /* Don't increase alignment too much for TLS variables - TLS space
1053 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1054 align
= const_align
;
1062 /* Return the section into which the given VAR_DECL or CONST_DECL
1063 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1064 section should be used wherever possible. */
1067 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1069 addr_space_t as
= ADDR_SPACE_GENERIC
;
1072 if (TREE_TYPE (decl
) != error_mark_node
)
1073 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1075 if (DECL_COMMON (decl
))
1077 /* If the decl has been given an explicit section name, or it resides
1078 in a non-generic address space, then it isn't common, and shouldn't
1079 be handled as such. */
1080 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1081 && ADDR_SPACE_GENERIC_P (as
));
1082 if (DECL_THREAD_LOCAL_P (decl
))
1083 return tls_comm_section
;
1084 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1085 return comm_section
;
1088 if (DECL_INITIAL (decl
) == error_mark_node
)
1089 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1090 else if (DECL_INITIAL (decl
))
1091 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1095 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1096 if (IN_NAMED_SECTION (decl
))
1097 return get_named_section (decl
, NULL
, reloc
);
1099 if (ADDR_SPACE_GENERIC_P (as
)
1100 && !DECL_THREAD_LOCAL_P (decl
)
1101 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1102 && bss_initializer_p (decl
))
1104 if (!TREE_PUBLIC (decl
)
1105 && !(flag_asan
&& asan_protect_global (decl
)))
1106 return lcomm_section
;
1107 if (bss_noswitch_section
)
1108 return bss_noswitch_section
;
1111 return targetm
.asm_out
.select_section (decl
, reloc
,
1112 get_variable_align (decl
));
1115 /* Return the block into which object_block DECL should be placed. */
1117 static struct object_block
*
1118 get_block_for_decl (tree decl
)
1122 if (TREE_CODE (decl
) == VAR_DECL
)
1124 /* The object must be defined in this translation unit. */
1125 if (DECL_EXTERNAL (decl
))
1128 /* There's no point using object blocks for something that is
1129 isolated by definition. */
1130 if (DECL_ONE_ONLY (decl
))
1134 /* We can only calculate block offsets if the decl has a known
1136 if (DECL_SIZE_UNIT (decl
) == NULL
)
1138 if (!host_integerp (DECL_SIZE_UNIT (decl
), 1))
1141 /* Find out which section should contain DECL. We cannot put it into
1142 an object block if it requires a standalone definition. */
1143 if (TREE_CODE (decl
) == VAR_DECL
)
1144 align_variable (decl
, 0);
1145 sect
= get_variable_section (decl
, true);
1146 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1149 return get_block_for_section (sect
);
1152 /* Make sure block symbol SYMBOL is in block BLOCK. */
1155 change_symbol_block (rtx symbol
, struct object_block
*block
)
1157 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1159 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1160 SYMBOL_REF_BLOCK (symbol
) = block
;
1164 /* Return true if it is possible to put DECL in an object_block. */
1167 use_blocks_for_decl_p (tree decl
)
1169 /* Only data DECLs can be placed into object blocks. */
1170 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1173 /* Detect decls created by dw2_force_const_mem. Such decls are
1174 special because DECL_INITIAL doesn't specify the decl's true value.
1175 dw2_output_indirect_constants will instead call assemble_variable
1176 with dont_output_data set to 1 and then print the contents itself. */
1177 if (DECL_INITIAL (decl
) == decl
)
1180 /* If this decl is an alias, then we don't want to emit a
1182 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)))
1185 return targetm
.use_blocks_for_decl_p (decl
);
1188 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1189 have static storage duration. In other words, it should not be an
1190 automatic variable, including PARM_DECLs.
1192 There is, however, one exception: this function handles variables
1193 explicitly placed in a particular register by the user.
1195 This is never called for PARM_DECL nodes. */
1198 make_decl_rtl (tree decl
)
1200 const char *name
= 0;
1204 /* Check that we are not being given an automatic variable. */
1205 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1206 && TREE_CODE (decl
) != RESULT_DECL
);
1208 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1209 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1210 || TREE_STATIC (decl
)
1211 || TREE_PUBLIC (decl
)
1212 || DECL_EXTERNAL (decl
)
1213 || DECL_REGISTER (decl
));
1215 /* And that we were not given a type or a label. */
1216 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1217 && TREE_CODE (decl
) != LABEL_DECL
);
1219 /* For a duplicate declaration, we can be called twice on the
1220 same DECL node. Don't discard the RTL already made. */
1221 if (DECL_RTL_SET_P (decl
))
1223 /* If the old RTL had the wrong mode, fix the mode. */
1224 x
= DECL_RTL (decl
);
1225 if (GET_MODE (x
) != DECL_MODE (decl
))
1226 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1228 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1231 /* ??? Another way to do this would be to maintain a hashed
1232 table of such critters. Instead of adding stuff to a DECL
1233 to give certain attributes to it, we could use an external
1234 hash map from DECL to set of attributes. */
1236 /* Let the target reassign the RTL if it wants.
1237 This is necessary, for example, when one machine specific
1238 decl attribute overrides another. */
1239 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1241 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1242 on the new decl information. */
1244 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1245 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1246 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1248 /* Make this function static known to the mudflap runtime. */
1249 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1250 mudflap_enqueue_decl (decl
);
1255 /* If this variable belongs to the global constant pool, retrieve the
1256 pre-computed RTL or recompute it in LTO mode. */
1257 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_IN_CONSTANT_POOL (decl
))
1259 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1263 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
1265 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1266 && DECL_REGISTER (decl
))
1268 error ("register name not specified for %q+D", decl
);
1270 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1272 const char *asmspec
= name
+1;
1273 enum machine_mode mode
= DECL_MODE (decl
);
1274 reg_number
= decode_reg_name (asmspec
);
1275 /* First detect errors in declaring global registers. */
1276 if (reg_number
== -1)
1277 error ("register name not specified for %q+D", decl
);
1278 else if (reg_number
< 0)
1279 error ("invalid register name for %q+D", decl
);
1280 else if (mode
== BLKmode
)
1281 error ("data type of %q+D isn%'t suitable for a register",
1283 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1284 error ("the register specified for %q+D cannot be accessed"
1285 " by the current target", decl
);
1286 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1287 error ("the register specified for %q+D is not general enough"
1288 " to be used as a register variable", decl
);
1289 else if (!HARD_REGNO_MODE_OK (reg_number
, mode
))
1290 error ("register specified for %q+D isn%'t suitable for data type",
1292 /* Now handle properly declared static register variables. */
1297 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1299 DECL_INITIAL (decl
) = 0;
1300 error ("global register variable has initial value");
1302 if (TREE_THIS_VOLATILE (decl
))
1303 warning (OPT_Wvolatile_register_var
,
1304 "optimization may eliminate reads and/or "
1305 "writes to register variables");
1307 /* If the user specified one of the eliminables registers here,
1308 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1309 confused with that register and be eliminated. This usage is
1310 somewhat suspect... */
1312 SET_DECL_RTL (decl
, gen_rtx_raw_REG (mode
, reg_number
));
1313 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1314 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1316 if (TREE_STATIC (decl
))
1318 /* Make this register global, so not usable for anything
1320 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1321 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1322 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1324 nregs
= hard_regno_nregs
[reg_number
][mode
];
1326 globalize_reg (decl
, reg_number
+ --nregs
);
1329 /* As a register variable, it has no section. */
1333 /* Now handle ordinary static variables and functions (in memory).
1334 Also handle vars declared register invalidly. */
1335 else if (name
[0] == '*')
1337 #ifdef REGISTER_PREFIX
1338 if (strlen (REGISTER_PREFIX
) != 0)
1340 reg_number
= decode_reg_name (name
);
1341 if (reg_number
>= 0 || reg_number
== -3)
1342 error ("register name given for non-register variable %q+D", decl
);
1347 /* Specifying a section attribute on a variable forces it into a
1348 non-.bss section, and thus it cannot be common. */
1349 /* FIXME: In general this code should not be necessary because
1350 visibility pass is doing the same work. But notice_global_symbol
1351 is called early and it needs to make DECL_RTL to get the name.
1352 we take care of recomputing the DECL_RTL after visibility is changed. */
1353 if (TREE_CODE (decl
) == VAR_DECL
1354 && DECL_SECTION_NAME (decl
) != NULL_TREE
1355 && DECL_INITIAL (decl
) == NULL_TREE
1356 && DECL_COMMON (decl
))
1357 DECL_COMMON (decl
) = 0;
1359 /* Variables can't be both common and weak. */
1360 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1361 DECL_COMMON (decl
) = 0;
1363 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1364 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1367 enum machine_mode address_mode
= Pmode
;
1368 if (TREE_TYPE (decl
) != error_mark_node
)
1370 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1371 address_mode
= targetm
.addr_space
.address_mode (as
);
1373 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1375 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1376 SET_SYMBOL_REF_DECL (x
, decl
);
1378 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1379 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1380 set_mem_attributes (x
, decl
, 1);
1381 SET_DECL_RTL (decl
, x
);
1383 /* Optionally set flags or add text to the name to record information
1384 such as that it is a function name.
1385 If the name is changed, the macro ASM_OUTPUT_LABELREF
1386 will have to know how to strip this information. */
1387 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1389 /* Make this function static known to the mudflap runtime. */
1390 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1391 mudflap_enqueue_decl (decl
);
1394 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1395 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1399 make_decl_rtl_for_debug (tree decl
)
1401 unsigned int save_aliasing_flag
, save_mudflap_flag
;
1404 if (DECL_RTL_SET_P (decl
))
1405 return DECL_RTL (decl
);
1407 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1408 call new_alias_set. If running with -fcompare-debug, sometimes
1409 we do not want to create alias sets that will throw the alias
1410 numbers off in the comparison dumps. So... clearing
1411 flag_strict_aliasing will keep new_alias_set() from creating a
1412 new set. It is undesirable to register decl with mudflap
1413 in this case as well. */
1414 save_aliasing_flag
= flag_strict_aliasing
;
1415 flag_strict_aliasing
= 0;
1416 save_mudflap_flag
= flag_mudflap
;
1419 rtl
= DECL_RTL (decl
);
1420 /* Reset DECL_RTL back, as various parts of the compiler expects
1421 DECL_RTL set meaning it is actually going to be output. */
1422 SET_DECL_RTL (decl
, NULL
);
1424 flag_strict_aliasing
= save_aliasing_flag
;
1425 flag_mudflap
= save_mudflap_flag
;
1430 /* Output a string of literal assembler code
1431 for an `asm' keyword used between functions. */
1434 assemble_asm (tree string
)
1439 if (TREE_CODE (string
) == ADDR_EXPR
)
1440 string
= TREE_OPERAND (string
, 0);
1442 p
= TREE_STRING_POINTER (string
);
1443 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1446 /* Write the address of the entity given by SYMBOL to SEC. */
1448 assemble_addr_to_section (rtx symbol
, section
*sec
)
1450 switch_to_section (sec
);
1451 assemble_align (POINTER_SIZE
);
1452 assemble_integer (symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1455 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1456 not) section for PRIORITY. */
1458 get_cdtor_priority_section (int priority
, bool constructor_p
)
1462 /* ??? This only works reliably with the GNU linker. */
1463 sprintf (buf
, "%s.%.5u",
1464 constructor_p
? ".ctors" : ".dtors",
1465 /* Invert the numbering so the linker puts us in the proper
1466 order; constructors are run from right to left, and the
1467 linker sorts in increasing order. */
1468 MAX_INIT_PRIORITY
- priority
);
1469 return get_section (buf
, SECTION_WRITE
, NULL
);
1473 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1477 if (priority
!= DEFAULT_INIT_PRIORITY
)
1478 sec
= get_cdtor_priority_section (priority
,
1479 /*constructor_p=*/false);
1481 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1483 assemble_addr_to_section (symbol
, sec
);
1486 #ifdef DTORS_SECTION_ASM_OP
1488 default_dtor_section_asm_out_destructor (rtx symbol
,
1489 int priority ATTRIBUTE_UNUSED
)
1491 assemble_addr_to_section (symbol
, dtors_section
);
1496 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1500 if (priority
!= DEFAULT_INIT_PRIORITY
)
1501 sec
= get_cdtor_priority_section (priority
,
1502 /*constructor_p=*/true);
1504 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1506 assemble_addr_to_section (symbol
, sec
);
1509 #ifdef CTORS_SECTION_ASM_OP
1511 default_ctor_section_asm_out_constructor (rtx symbol
,
1512 int priority ATTRIBUTE_UNUSED
)
1514 assemble_addr_to_section (symbol
, ctors_section
);
1518 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1519 a nonzero value if the constant pool should be output before the
1520 start of the function, or a zero value if the pool should output
1521 after the end of the function. The default is to put it before the
1524 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1525 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1528 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1529 to be output to assembler.
1530 Set first_global_object_name and weak_global_object_name as appropriate. */
1533 notice_global_symbol (tree decl
)
1535 const char **type
= &first_global_object_name
;
1537 if (first_global_object_name
1538 || !TREE_PUBLIC (decl
)
1539 || DECL_EXTERNAL (decl
)
1540 || !DECL_NAME (decl
)
1541 || (TREE_CODE (decl
) != FUNCTION_DECL
1542 && (TREE_CODE (decl
) != VAR_DECL
1543 || (DECL_COMMON (decl
)
1544 && (DECL_INITIAL (decl
) == 0
1545 || DECL_INITIAL (decl
) == error_mark_node
))))
1546 || !MEM_P (DECL_RTL (decl
)))
1549 /* We win when global object is found, but it is useful to know about weak
1550 symbol as well so we can produce nicer unique names. */
1551 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1552 type
= &weak_global_object_name
;
1558 rtx decl_rtl
= DECL_RTL (decl
);
1560 p
= targetm
.strip_name_encoding (XSTR (XEXP (decl_rtl
, 0), 0));
1561 name
= ggc_strdup (p
);
1567 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1568 current function goes into the cold section, so that targets can use
1569 current_function_section during RTL expansion. DECL describes the
1573 decide_function_section (tree decl
)
1575 first_function_block_is_cold
= false;
1577 if (flag_reorder_blocks_and_partition
)
1578 /* We will decide in assemble_start_function. */
1581 if (DECL_SECTION_NAME (decl
))
1583 struct cgraph_node
*node
= cgraph_get_node (current_function_decl
);
1584 /* Calls to function_section rely on first_function_block_is_cold
1586 first_function_block_is_cold
= (node
1588 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1591 in_cold_section_p
= first_function_block_is_cold
;
1594 /* Output assembler code for the constant pool of a function and associated
1595 with defining the name of the function. DECL describes the function.
1596 NAME is the function's name. For the constant pool, we use the current
1597 constant pool data. */
1600 assemble_start_function (tree decl
, const char *fnname
)
1603 char tmp_label
[100];
1604 bool hot_label_written
= false;
1606 if (flag_reorder_blocks_and_partition
)
1608 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1609 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1610 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1611 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1612 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1613 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1614 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1615 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1620 crtl
->subsections
.hot_section_label
= NULL
;
1621 crtl
->subsections
.cold_section_label
= NULL
;
1622 crtl
->subsections
.hot_section_end_label
= NULL
;
1623 crtl
->subsections
.cold_section_end_label
= NULL
;
1626 /* The following code does not need preprocessing in the assembler. */
1630 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1631 output_constant_pool (fnname
, decl
);
1633 /* Make sure the not and cold text (code) sections are properly
1634 aligned. This is necessary here in the case where the function
1635 has both hot and cold sections, because we don't want to re-set
1636 the alignment when the section switch happens mid-function. */
1638 if (flag_reorder_blocks_and_partition
)
1640 first_function_block_is_cold
= false;
1642 switch_to_section (unlikely_text_section ());
1643 assemble_align (DECL_ALIGN (decl
));
1644 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1646 /* When the function starts with a cold section, we need to explicitly
1647 align the hot section and write out the hot section label.
1648 But if the current function is a thunk, we do not have a CFG. */
1650 && BB_PARTITION (ENTRY_BLOCK_PTR
->next_bb
) == BB_COLD_PARTITION
)
1652 switch_to_section (text_section
);
1653 assemble_align (DECL_ALIGN (decl
));
1654 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1655 hot_label_written
= true;
1656 first_function_block_is_cold
= true;
1658 in_cold_section_p
= first_function_block_is_cold
;
1662 /* Switch to the correct text section for the start of the function. */
1664 switch_to_section (function_section (decl
));
1665 if (flag_reorder_blocks_and_partition
1666 && !hot_label_written
)
1667 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1669 /* Tell assembler to move to target machine's alignment for functions. */
1670 align
= floor_log2 (DECL_ALIGN (decl
) / BITS_PER_UNIT
);
1673 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1676 /* Handle a user-specified function alignment.
1677 Note that we still need to align to DECL_ALIGN, as above,
1678 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1679 if (! DECL_USER_ALIGN (decl
)
1680 && align_functions_log
> align
1681 && optimize_function_for_speed_p (cfun
))
1683 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1684 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1685 align_functions_log
, align_functions
- 1);
1687 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1691 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1692 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1695 if (!DECL_IGNORED_P (decl
))
1696 (*debug_hooks
->begin_function
) (decl
);
1698 /* Make function name accessible from other files, if appropriate. */
1700 if (TREE_PUBLIC (decl
))
1702 notice_global_symbol (decl
);
1704 globalize_decl (decl
);
1706 maybe_assemble_visibility (decl
);
1709 if (DECL_PRESERVE_P (decl
))
1710 targetm
.asm_out
.mark_decl_preserved (fnname
);
1712 /* Do any machine/system dependent processing of the function name. */
1713 #ifdef ASM_DECLARE_FUNCTION_NAME
1714 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1716 /* Standard thing is just output label for the function. */
1717 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1718 #endif /* ASM_DECLARE_FUNCTION_NAME */
1720 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1721 saw_no_split_stack
= true;
1724 /* Output assembler code associated with defining the size of the
1725 function. DECL describes the function. NAME is the function's name. */
1728 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1730 #ifdef ASM_DECLARE_FUNCTION_SIZE
1731 /* We could have switched section in the middle of the function. */
1732 if (flag_reorder_blocks_and_partition
)
1733 switch_to_section (function_section (decl
));
1734 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1736 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1738 output_constant_pool (fnname
, decl
);
1739 switch_to_section (function_section (decl
)); /* need to switch back */
1741 /* Output labels for end of hot/cold text sections (to be used by
1743 if (flag_reorder_blocks_and_partition
)
1745 section
*save_text_section
;
1747 save_text_section
= in_section
;
1748 switch_to_section (unlikely_text_section ());
1749 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1750 if (first_function_block_is_cold
)
1751 switch_to_section (text_section
);
1753 switch_to_section (function_section (decl
));
1754 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1755 switch_to_section (save_text_section
);
1759 /* Assemble code to leave SIZE bytes of zeros. */
1762 assemble_zeros (unsigned HOST_WIDE_INT size
)
1764 /* Do no output if -fsyntax-only. */
1765 if (flag_syntax_only
)
1768 #ifdef ASM_NO_SKIP_IN_TEXT
1769 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1770 so we must output 0s explicitly in the text section. */
1771 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1773 unsigned HOST_WIDE_INT i
;
1774 for (i
= 0; i
< size
; i
++)
1775 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1780 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1783 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1786 assemble_align (int align
)
1788 if (align
> BITS_PER_UNIT
)
1790 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1794 /* Assemble a string constant with the specified C string as contents. */
1797 assemble_string (const char *p
, int size
)
1802 /* If the string is very long, split it up. */
1806 int thissize
= size
- pos
;
1807 if (thissize
> maximum
)
1810 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1818 /* A noswitch_section_callback for lcomm_section. */
1821 emit_local (tree decl ATTRIBUTE_UNUSED
,
1822 const char *name ATTRIBUTE_UNUSED
,
1823 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1824 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1826 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1827 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1828 size
, DECL_ALIGN (decl
));
1830 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1831 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1834 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1839 /* A noswitch_section_callback for bss_noswitch_section. */
1841 #if defined ASM_OUTPUT_ALIGNED_BSS
1843 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1844 const char *name ATTRIBUTE_UNUSED
,
1845 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1846 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1848 #if defined ASM_OUTPUT_ALIGNED_BSS
1849 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
,
1850 get_variable_align (decl
));
1856 /* A noswitch_section_callback for comm_section. */
1859 emit_common (tree decl ATTRIBUTE_UNUSED
,
1860 const char *name ATTRIBUTE_UNUSED
,
1861 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1862 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1864 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1865 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1866 size
, get_variable_align (decl
));
1868 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1869 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
,
1870 get_variable_align (decl
));
1873 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1878 /* A noswitch_section_callback for tls_comm_section. */
1881 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1882 const char *name ATTRIBUTE_UNUSED
,
1883 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1884 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1886 #ifdef ASM_OUTPUT_TLS_COMMON
1887 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
1890 sorry ("thread-local COMMON data not implemented");
1895 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1896 NAME is the name of DECL's SYMBOL_REF. */
1899 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
,
1902 unsigned HOST_WIDE_INT size
, rounded
;
1904 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
1907 if (flag_asan
&& asan_protect_global (decl
))
1908 size
+= asan_red_zone_size (size
);
1910 /* Don't allocate zero bytes of common,
1911 since that means "undefined external" in the linker. */
1915 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1916 so that each uninitialized object starts on such a boundary. */
1917 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
1918 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
1919 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
1921 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
1922 && (unsigned HOST_WIDE_INT
) (align
/ BITS_PER_UNIT
) > rounded
)
1923 warning (0, "requested alignment for %q+D is greater than "
1924 "implemented alignment of %wu", decl
, rounded
);
1927 /* A subroutine of assemble_variable. Output the label and contents of
1928 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1929 is as for assemble_variable. */
1932 assemble_variable_contents (tree decl
, const char *name
,
1933 bool dont_output_data
)
1935 /* Do any machine/system dependent processing of the object. */
1936 #ifdef ASM_DECLARE_OBJECT_NAME
1937 last_assemble_variable_decl
= decl
;
1938 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
1940 /* Standard thing is just output label for the object. */
1941 ASM_OUTPUT_LABEL (asm_out_file
, name
);
1942 #endif /* ASM_DECLARE_OBJECT_NAME */
1944 if (!dont_output_data
)
1946 if (DECL_INITIAL (decl
)
1947 && DECL_INITIAL (decl
) != error_mark_node
1948 && !initializer_zerop (DECL_INITIAL (decl
)))
1949 /* Output the actual data. */
1950 output_constant (DECL_INITIAL (decl
),
1951 tree_low_cst (DECL_SIZE_UNIT (decl
), 1),
1952 get_variable_align (decl
));
1954 /* Leave space for it. */
1955 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl
), 1));
1959 /* Assemble everything that is needed for a variable or function declaration.
1960 Not used for automatic variables, and not used for function definitions.
1961 Should not be called for variables of incomplete structure type.
1963 TOP_LEVEL is nonzero if this variable has file scope.
1964 AT_END is nonzero if this is the special handling, at end of compilation,
1965 to define things that have had only tentative definitions.
1966 DONT_OUTPUT_DATA if nonzero means don't actually output the
1967 initial value (that will be done by the caller). */
1970 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
1971 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
1974 rtx decl_rtl
, symbol
;
1977 bool asan_protected
= false;
1979 /* This function is supposed to handle VARIABLES. Ensure we have one. */
1980 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
1982 /* Emulated TLS had better not get this far. */
1983 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
1985 last_assemble_variable_decl
= 0;
1987 /* Normally no need to say anything here for external references,
1988 since assemble_external is called by the language-specific code
1989 when a declaration is first seen. */
1991 if (DECL_EXTERNAL (decl
))
1994 /* Do nothing for global register variables. */
1995 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
1997 TREE_ASM_WRITTEN (decl
) = 1;
2001 /* If type was incomplete when the variable was declared,
2002 see if it is complete now. */
2004 if (DECL_SIZE (decl
) == 0)
2005 layout_decl (decl
, 0);
2007 /* Still incomplete => don't allocate it; treat the tentative defn
2008 (which is what it must have been) as an `extern' reference. */
2010 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2012 error ("storage size of %q+D isn%'t known", decl
);
2013 TREE_ASM_WRITTEN (decl
) = 1;
2017 /* The first declaration of a variable that comes through this function
2018 decides whether it is global (in C, has external linkage)
2019 or local (in C, has internal linkage). So do nothing more
2020 if this function has already run. */
2022 if (TREE_ASM_WRITTEN (decl
))
2025 /* Make sure targetm.encode_section_info is invoked before we set
2027 decl_rtl
= DECL_RTL (decl
);
2029 TREE_ASM_WRITTEN (decl
) = 1;
2031 /* Do no output if -fsyntax-only. */
2032 if (flag_syntax_only
)
2035 if (! dont_output_data
2036 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
2038 error ("size of variable %q+D is too large", decl
);
2042 gcc_assert (MEM_P (decl_rtl
));
2043 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2044 symbol
= XEXP (decl_rtl
, 0);
2046 /* If this symbol belongs to the tree constant pool, output the constant
2047 if it hasn't already been written. */
2048 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
2050 tree decl
= SYMBOL_REF_DECL (symbol
);
2051 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
2052 output_constant_def_contents (symbol
);
2058 name
= XSTR (symbol
, 0);
2059 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2060 notice_global_symbol (decl
);
2062 /* Compute the alignment of this data. */
2064 align_variable (decl
, dont_output_data
);
2067 && asan_protect_global (decl
))
2069 asan_protected
= true;
2070 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
2071 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
2074 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2076 align
= get_variable_align (decl
);
2078 if (TREE_PUBLIC (decl
))
2079 maybe_assemble_visibility (decl
);
2081 if (DECL_PRESERVE_P (decl
))
2082 targetm
.asm_out
.mark_decl_preserved (name
);
2084 /* First make the assembler name(s) global if appropriate. */
2085 sect
= get_variable_section (decl
, false);
2086 if (TREE_PUBLIC (decl
)
2087 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2088 globalize_decl (decl
);
2090 /* Output any data that we will need to use the address of. */
2091 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2092 output_addressed_constants (DECL_INITIAL (decl
));
2094 /* dbxout.c needs to know this. */
2095 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2096 DECL_IN_TEXT_SECTION (decl
) = 1;
2098 /* If the decl is part of an object_block, make sure that the decl
2099 has been positioned within its block, but do not write out its
2100 definition yet. output_object_blocks will do that later. */
2101 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2103 gcc_assert (!dont_output_data
);
2104 place_block_symbol (symbol
);
2106 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2107 assemble_noswitch_variable (decl
, name
, sect
, align
);
2110 switch_to_section (sect
);
2111 if (align
> BITS_PER_UNIT
)
2112 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
2113 assemble_variable_contents (decl
, name
, dont_output_data
);
2116 unsigned HOST_WIDE_INT
int size
2117 = tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
2118 assemble_zeros (asan_red_zone_size (size
));
2123 /* Return 1 if type TYPE contains any pointers. */
2126 contains_pointers_p (tree type
)
2128 switch (TREE_CODE (type
))
2131 case REFERENCE_TYPE
:
2132 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2133 so I'll play safe and return 1. */
2139 case QUAL_UNION_TYPE
:
2142 /* For a type that has fields, see if the fields have pointers. */
2143 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2144 if (TREE_CODE (fields
) == FIELD_DECL
2145 && contains_pointers_p (TREE_TYPE (fields
)))
2151 /* An array type contains pointers if its element type does. */
2152 return contains_pointers_p (TREE_TYPE (type
));
2159 /* We delay assemble_external processing until
2160 the compilation unit is finalized. This is the best we can do for
2161 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2162 it all the way to final. See PR 17982 for further discussion. */
2163 static GTY(()) tree pending_assemble_externals
;
2165 #ifdef ASM_OUTPUT_EXTERNAL
2166 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2167 As a result, assemble_external can be called after the list of externals
2168 is processed and the pointer set destroyed. */
2169 static bool pending_assemble_externals_processed
;
2171 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2172 TREE_LIST in assemble_external. */
2173 static struct pointer_set_t
*pending_assemble_externals_set
;
2175 /* True if DECL is a function decl for which no out-of-line copy exists.
2176 It is assumed that DECL's assembler name has been set. */
2179 incorporeal_function_p (tree decl
)
2181 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2185 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2186 && (DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
2187 || DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA_WITH_ALIGN
))
2190 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2191 /* Atomic or sync builtins which have survived this far will be
2192 resolved externally and therefore are not incorporeal. */
2193 if (strncmp (name
, "__builtin_", 10) == 0)
2199 /* Actually do the tests to determine if this is necessary, and invoke
2200 ASM_OUTPUT_EXTERNAL. */
2202 assemble_external_real (tree decl
)
2204 rtx rtl
= DECL_RTL (decl
);
2206 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2207 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2208 && !incorporeal_function_p (decl
))
2210 /* Some systems do require some output. */
2211 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2212 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2218 process_pending_assemble_externals (void)
2220 #ifdef ASM_OUTPUT_EXTERNAL
2222 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2223 assemble_external_real (TREE_VALUE (list
));
2225 pending_assemble_externals
= 0;
2226 pending_assemble_externals_processed
= true;
2227 pointer_set_destroy (pending_assemble_externals_set
);
2231 /* This TREE_LIST contains any weak symbol declarations waiting
2233 static GTY(()) tree weak_decls
;
2235 /* Output something to declare an external symbol to the assembler,
2236 and qualifiers such as weakness. (Most assemblers don't need
2237 extern declaration, so we normally output nothing.) Do nothing if
2238 DECL is not external. */
2241 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2243 /* Make sure that the ASM_OUT_FILE is open.
2244 If it's not, we should not be calling this function. */
2245 gcc_assert (asm_out_file
);
2247 /* In a perfect world, the following condition would be true.
2248 Sadly, the Java and Go front ends emit assembly *from the front end*,
2249 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2251 /* This function should only be called if we are expanding, or have
2253 Ideally, only final.c would be calling this function, but it is
2254 not clear whether that would break things somehow. See PR 17982
2255 for further discussion. */
2256 gcc_assert (cgraph_state
== CGRAPH_STATE_EXPANSION
2257 || cgraph_state
== CGRAPH_STATE_FINISHED
);
2260 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2263 /* We want to output annotation for weak and external symbols at
2264 very last to check if they are references or not. */
2266 if (TARGET_SUPPORTS_WEAK
2268 /* TREE_STATIC is a weird and abused creature which is not
2269 generally the right test for whether an entity has been
2270 locally emitted, inlined or otherwise not-really-extern, but
2271 for declarations that can be weak, it happens to be
2273 && !TREE_STATIC (decl
)
2274 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2275 && value_member (decl
, weak_decls
) == NULL_TREE
)
2276 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2278 #ifdef ASM_OUTPUT_EXTERNAL
2279 if (pending_assemble_externals_processed
)
2281 assemble_external_real (decl
);
2285 if (! pointer_set_insert (pending_assemble_externals_set
, decl
))
2286 pending_assemble_externals
= tree_cons (NULL
, decl
,
2287 pending_assemble_externals
);
2291 /* Similar, for calling a library function FUN. */
2294 assemble_external_libcall (rtx fun
)
2296 /* Declare library function name external when first used, if nec. */
2297 if (! SYMBOL_REF_USED (fun
))
2299 SYMBOL_REF_USED (fun
) = 1;
2300 targetm
.asm_out
.external_libcall (fun
);
2304 /* Assemble a label named NAME. */
2307 assemble_label (FILE *file
, const char *name
)
2309 ASM_OUTPUT_LABEL (file
, name
);
2312 /* Set the symbol_referenced flag for ID. */
2314 mark_referenced (tree id
)
2316 TREE_SYMBOL_REFERENCED (id
) = 1;
2319 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2321 mark_decl_referenced (tree decl
)
2323 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2325 /* Extern inline functions don't become needed when referenced.
2326 If we know a method will be emitted in other TU and no new
2327 functions can be marked reachable, just use the external
2329 struct cgraph_node
*node
= cgraph_get_create_node (decl
);
2330 if (!DECL_EXTERNAL (decl
)
2331 && !node
->symbol
.definition
)
2332 cgraph_mark_force_output_node (node
);
2334 else if (TREE_CODE (decl
) == VAR_DECL
)
2336 struct varpool_node
*node
= varpool_node_for_decl (decl
);
2337 /* C++ frontend use mark_decl_references to force COMDAT variables
2338 to be output that might appear dead otherwise. */
2339 node
->symbol
.force_output
= true;
2341 /* else do nothing - we can get various sorts of CST nodes here,
2342 which do not need to be marked. */
2346 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2347 until we find an identifier that is not itself a transparent alias.
2348 Modify the alias passed to it by reference (and all aliases on the
2349 way to the ultimate target), such that they do not have to be
2350 followed again, and return the ultimate target of the alias
2354 ultimate_transparent_alias_target (tree
*alias
)
2356 tree target
= *alias
;
2358 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
2360 gcc_assert (TREE_CHAIN (target
));
2361 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
2362 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
2363 && ! TREE_CHAIN (target
));
2370 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2371 starts with a *, the rest of NAME is output verbatim. Otherwise
2372 NAME is transformed in a target-specific way (usually by the
2373 addition of an underscore). */
2376 assemble_name_raw (FILE *file
, const char *name
)
2379 fputs (&name
[1], file
);
2381 ASM_OUTPUT_LABELREF (file
, name
);
2384 /* Like assemble_name_raw, but should be used when NAME might refer to
2385 an entity that is also represented as a tree (like a function or
2386 variable). If NAME does refer to such an entity, that entity will
2387 be marked as referenced. */
2390 assemble_name (FILE *file
, const char *name
)
2392 const char *real_name
;
2395 real_name
= targetm
.strip_name_encoding (name
);
2397 id
= maybe_get_identifier (real_name
);
2402 mark_referenced (id
);
2403 ultimate_transparent_alias_target (&id
);
2405 name
= IDENTIFIER_POINTER (id
);
2406 gcc_assert (! TREE_CHAIN (id
));
2409 assemble_name_raw (file
, name
);
2412 /* Allocate SIZE bytes writable static space with a gensym name
2413 and return an RTX to refer to its address. */
2416 assemble_static_space (unsigned HOST_WIDE_INT size
)
2419 const char *namestring
;
2422 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2424 namestring
= ggc_strdup (name
);
2426 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2427 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2429 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2430 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2433 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2434 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2437 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2438 so that each uninitialized object starts on such a boundary. */
2439 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2440 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2441 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2442 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2443 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2444 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2451 /* Assemble the static constant template for function entry trampolines.
2452 This is done at most once per compilation.
2453 Returns an RTX for the address of the template. */
2455 static GTY(()) rtx initial_trampoline
;
2458 assemble_trampoline_template (void)
2465 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2467 if (initial_trampoline
)
2468 return initial_trampoline
;
2470 /* By default, put trampoline templates in read-only data section. */
2472 #ifdef TRAMPOLINE_SECTION
2473 switch_to_section (TRAMPOLINE_SECTION
);
2475 switch_to_section (readonly_data_section
);
2478 /* Write the assembler code to define one. */
2479 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2481 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2483 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2484 targetm
.asm_out
.trampoline_template (asm_out_file
);
2486 /* Record the rtl to refer to it. */
2487 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2488 name
= ggc_strdup (label
);
2489 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2490 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2492 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2493 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2494 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2496 return initial_trampoline
;
2499 /* A and B are either alignments or offsets. Return the minimum alignment
2500 that may be assumed after adding the two together. */
2502 static inline unsigned
2503 min_align (unsigned int a
, unsigned int b
)
2505 return (a
| b
) & -(a
| b
);
2508 /* Return the assembler directive for creating a given kind of integer
2509 object. SIZE is the number of bytes in the object and ALIGNED_P
2510 indicates whether it is known to be aligned. Return NULL if the
2511 assembly dialect has no such directive.
2513 The returned string should be printed at the start of a new line and
2514 be followed immediately by the object's initial value. */
2517 integer_asm_op (int size
, int aligned_p
)
2519 struct asm_int_op
*ops
;
2522 ops
= &targetm
.asm_out
.aligned_op
;
2524 ops
= &targetm
.asm_out
.unaligned_op
;
2529 return targetm
.asm_out
.byte_op
;
2543 /* Use directive OP to assemble an integer object X. Print OP at the
2544 start of the line, followed immediately by the value of X. */
2547 assemble_integer_with_op (const char *op
, rtx x
)
2549 fputs (op
, asm_out_file
);
2550 output_addr_const (asm_out_file
, x
);
2551 fputc ('\n', asm_out_file
);
2554 /* The default implementation of the asm_out.integer target hook. */
2557 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2558 unsigned int size ATTRIBUTE_UNUSED
,
2559 int aligned_p ATTRIBUTE_UNUSED
)
2561 const char *op
= integer_asm_op (size
, aligned_p
);
2562 /* Avoid GAS bugs for large values. Specifically negative values whose
2563 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2564 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE
/ BITS_PER_UNIT
)
2566 return op
&& (assemble_integer_with_op (op
, x
), true);
2569 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2570 the alignment of the integer in bits. Return 1 if we were able to output
2571 the constant, otherwise 0. We must be able to output the constant,
2572 if FORCE is nonzero. */
2575 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2579 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2581 /* See if the target hook can handle this kind of object. */
2582 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2585 /* If the object is a multi-byte one, try splitting it up. Split
2586 it into words it if is multi-word, otherwise split it into bytes. */
2589 enum machine_mode omode
, imode
;
2590 unsigned int subalign
;
2591 unsigned int subsize
, i
;
2592 enum mode_class mclass
;
2594 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2595 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2596 if (GET_CODE (x
) == CONST_FIXED
)
2597 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2601 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2602 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2604 for (i
= 0; i
< size
; i
+= subsize
)
2606 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2607 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2613 /* If we've printed some of it, but not all of it, there's no going
2618 gcc_assert (!force
);
2624 assemble_real (REAL_VALUE_TYPE d
, enum machine_mode mode
, unsigned int align
)
2626 long data
[4] = {0, 0, 0, 0};
2628 int bitsize
, nelts
, nunits
, units_per
;
2630 /* This is hairy. We have a quantity of known size. real_to_target
2631 will put it into an array of *host* longs, 32 bits per element
2632 (even if long is more than 32 bits). We need to determine the
2633 number of array elements that are occupied (nelts) and the number
2634 of *target* min-addressable units that will be occupied in the
2635 object file (nunits). We cannot assume that 32 divides the
2636 mode's bitsize (size * BITS_PER_UNIT) evenly.
2638 size * BITS_PER_UNIT is used here to make sure that padding bits
2639 (which might appear at either end of the value; real_to_target
2640 will include the padding bits in its output array) are included. */
2642 nunits
= GET_MODE_SIZE (mode
);
2643 bitsize
= nunits
* BITS_PER_UNIT
;
2644 nelts
= CEIL (bitsize
, 32);
2645 units_per
= 32 / BITS_PER_UNIT
;
2647 real_to_target (data
, &d
, mode
);
2649 /* Put out the first word with the specified alignment. */
2650 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2651 nunits
-= units_per
;
2653 /* Subsequent words need only 32-bit alignment. */
2654 align
= min_align (align
, 32);
2656 for (i
= 1; i
< nelts
; i
++)
2658 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2659 nunits
-= units_per
;
2663 /* Given an expression EXP with a constant value,
2664 reduce it to the sum of an assembler symbol and an integer.
2665 Store them both in the structure *VALUE.
2666 EXP must be reducible. */
2670 HOST_WIDE_INT offset
;
2674 decode_addr_const (tree exp
, struct addr_const
*value
)
2676 tree target
= TREE_OPERAND (exp
, 0);
2682 if (TREE_CODE (target
) == COMPONENT_REF
2683 && host_integerp (byte_position (TREE_OPERAND (target
, 1)), 0))
2685 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2686 target
= TREE_OPERAND (target
, 0);
2688 else if (TREE_CODE (target
) == ARRAY_REF
2689 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2691 offset
+= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target
)), 1)
2692 * tree_low_cst (TREE_OPERAND (target
, 1), 0));
2693 target
= TREE_OPERAND (target
, 0);
2695 else if (TREE_CODE (target
) == MEM_REF
2696 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2698 offset
+= mem_ref_offset (target
).low
;
2699 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2701 else if (TREE_CODE (target
) == INDIRECT_REF
2702 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2703 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2705 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2710 switch (TREE_CODE (target
))
2714 x
= DECL_RTL (target
);
2718 x
= gen_rtx_MEM (FUNCTION_MODE
,
2719 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2728 x
= output_constant_def (target
, 1);
2735 gcc_assert (MEM_P (x
));
2739 value
->offset
= offset
;
2743 static GTY((param_is (struct constant_descriptor_tree
)))
2744 htab_t const_desc_htab
;
2746 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2748 /* Constant pool accessor function. */
2751 constant_pool_htab (void)
2753 return const_desc_htab
;
2756 /* Compute a hash code for a constant expression. */
2759 const_desc_hash (const void *ptr
)
2761 return ((const struct constant_descriptor_tree
*)ptr
)->hash
;
2765 const_hash_1 (const tree exp
)
2770 enum tree_code code
= TREE_CODE (exp
);
2772 /* Either set P and LEN to the address and len of something to hash and
2773 exit the switch or return a value. */
2778 p
= (char *) &TREE_INT_CST (exp
);
2779 len
= sizeof TREE_INT_CST (exp
);
2783 return real_hash (TREE_REAL_CST_PTR (exp
));
2786 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2789 p
= TREE_STRING_POINTER (exp
);
2790 len
= TREE_STRING_LENGTH (exp
);
2794 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2795 + const_hash_1 (TREE_IMAGPART (exp
)));
2801 hi
= 7 + VECTOR_CST_NELTS (exp
);
2803 for (i
= 0; i
< VECTOR_CST_NELTS (exp
); ++i
)
2804 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ELT (exp
, i
));
2811 unsigned HOST_WIDE_INT idx
;
2814 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2816 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2818 hi
= hi
* 603 + const_hash_1 (value
);
2826 struct addr_const value
;
2828 decode_addr_const (exp
, &value
);
2829 switch (GET_CODE (value
.base
))
2832 /* Don't hash the address of the SYMBOL_REF;
2833 only use the offset and the symbol name. */
2835 p
= XSTR (value
.base
, 0);
2836 for (i
= 0; p
[i
] != 0; i
++)
2837 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2841 hi
= value
.offset
+ CODE_LABEL_NUMBER (XEXP (value
.base
, 0)) * 13;
2851 case POINTER_PLUS_EXPR
:
2853 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2854 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2857 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2860 /* A language specific constant. Just hash the code. */
2864 /* Compute hashing function. */
2866 for (i
= 0; i
< len
; i
++)
2867 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2872 /* Wrapper of compare_constant, for the htab interface. */
2874 const_desc_eq (const void *p1
, const void *p2
)
2876 const struct constant_descriptor_tree
*const c1
2877 = (const struct constant_descriptor_tree
*) p1
;
2878 const struct constant_descriptor_tree
*const c2
2879 = (const struct constant_descriptor_tree
*) p2
;
2880 if (c1
->hash
!= c2
->hash
)
2882 return compare_constant (c1
->value
, c2
->value
);
2885 /* Compare t1 and t2, and return 1 only if they are known to result in
2886 the same bit pattern on output. */
2889 compare_constant (const tree t1
, const tree t2
)
2891 enum tree_code typecode
;
2893 if (t1
== NULL_TREE
)
2894 return t2
== NULL_TREE
;
2895 if (t2
== NULL_TREE
)
2898 if (TREE_CODE (t1
) != TREE_CODE (t2
))
2901 switch (TREE_CODE (t1
))
2904 /* Integer constants are the same only if the same width of type. */
2905 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2907 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2909 return tree_int_cst_equal (t1
, t2
);
2912 /* Real constants are the same only if the same width of type. */
2913 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2916 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
2919 /* Fixed constants are the same only if the same width of type. */
2920 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2923 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
2926 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2929 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
2930 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
2931 TREE_STRING_LENGTH (t1
)));
2934 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
2935 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
2941 if (VECTOR_CST_NELTS (t1
) != VECTOR_CST_NELTS (t2
))
2944 for (i
= 0; i
< VECTOR_CST_NELTS (t1
); ++i
)
2945 if (!compare_constant (VECTOR_CST_ELT (t1
, i
),
2946 VECTOR_CST_ELT (t2
, i
)))
2954 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
2955 unsigned HOST_WIDE_INT idx
;
2957 typecode
= TREE_CODE (TREE_TYPE (t1
));
2958 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
2961 if (typecode
== ARRAY_TYPE
)
2963 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
2964 /* For arrays, check that the sizes all match. */
2965 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
2967 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
2972 /* For record and union constructors, require exact type
2974 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
2978 v1
= CONSTRUCTOR_ELTS (t1
);
2979 v2
= CONSTRUCTOR_ELTS (t2
);
2980 if (vec_safe_length (v1
) != vec_safe_length (v2
))
2983 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
2985 constructor_elt
*c1
= &(*v1
)[idx
];
2986 constructor_elt
*c2
= &(*v2
)[idx
];
2988 /* Check that each value is the same... */
2989 if (!compare_constant (c1
->value
, c2
->value
))
2991 /* ... and that they apply to the same fields! */
2992 if (typecode
== ARRAY_TYPE
)
2994 if (!compare_constant (c1
->index
, c2
->index
))
2999 if (c1
->index
!= c2
->index
)
3010 struct addr_const value1
, value2
;
3014 decode_addr_const (t1
, &value1
);
3015 decode_addr_const (t2
, &value2
);
3017 if (value1
.offset
!= value2
.offset
)
3020 code
= GET_CODE (value1
.base
);
3021 if (code
!= GET_CODE (value2
.base
))
3027 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3031 ret
= (CODE_LABEL_NUMBER (XEXP (value1
.base
, 0))
3032 == CODE_LABEL_NUMBER (XEXP (value2
.base
, 0)));
3042 case POINTER_PLUS_EXPR
:
3045 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3046 && compare_constant(TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3049 case VIEW_CONVERT_EXPR
:
3050 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3059 /* Make a copy of the whole tree structure for a constant. This
3060 handles the same types of nodes that compare_constant handles. */
3063 copy_constant (tree exp
)
3065 switch (TREE_CODE (exp
))
3068 /* For ADDR_EXPR, we do not want to copy the decl whose address
3069 is requested. We do want to copy constants though. */
3070 if (CONSTANT_CLASS_P (TREE_OPERAND (exp
, 0)))
3071 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3072 copy_constant (TREE_OPERAND (exp
, 0)));
3074 return copy_node (exp
);
3080 return copy_node (exp
);
3083 return build_complex (TREE_TYPE (exp
),
3084 copy_constant (TREE_REALPART (exp
)),
3085 copy_constant (TREE_IMAGPART (exp
)));
3088 case POINTER_PLUS_EXPR
:
3090 return build2 (TREE_CODE (exp
), TREE_TYPE (exp
),
3091 copy_constant (TREE_OPERAND (exp
, 0)),
3092 copy_constant (TREE_OPERAND (exp
, 1)));
3095 case VIEW_CONVERT_EXPR
:
3096 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3097 copy_constant (TREE_OPERAND (exp
, 0)));
3100 return build_vector (TREE_TYPE (exp
), VECTOR_CST_ELTS (exp
));
3104 tree copy
= copy_node (exp
);
3105 vec
<constructor_elt
, va_gc
> *v
;
3106 unsigned HOST_WIDE_INT idx
;
3107 tree purpose
, value
;
3109 vec_alloc (v
, vec_safe_length (CONSTRUCTOR_ELTS (exp
)));
3110 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp
), idx
, purpose
, value
)
3112 constructor_elt ce
= {purpose
, copy_constant (value
)};
3115 CONSTRUCTOR_ELTS (copy
) = v
;
3124 /* Return the section into which constant EXP should be placed. */
3127 get_constant_section (tree exp
, unsigned int align
)
3129 return targetm
.asm_out
.select_section (exp
,
3130 compute_reloc_for_constant (exp
),
3134 /* Return the size of constant EXP in bytes. */
3136 static HOST_WIDE_INT
3137 get_constant_size (tree exp
)
3141 size
= int_size_in_bytes (TREE_TYPE (exp
));
3142 if (TREE_CODE (exp
) == STRING_CST
)
3143 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3147 /* Subroutine of output_constant_def:
3148 No constant equal to EXP is known to have been output.
3149 Make a constant descriptor to enter EXP in the hash table.
3150 Assign the label number and construct RTL to refer to the
3151 constant's location in memory.
3152 Caller is responsible for updating the hash table. */
3154 static struct constant_descriptor_tree
*
3155 build_constant_desc (tree exp
)
3157 struct constant_descriptor_tree
*desc
;
3163 desc
= ggc_alloc_constant_descriptor_tree ();
3164 desc
->value
= copy_constant (exp
);
3166 /* Propagate marked-ness to copied constant. */
3167 if (flag_mudflap
&& mf_marked_p (exp
))
3168 mf_mark (desc
->value
);
3170 /* Create a string containing the label name, in LABEL. */
3171 labelno
= const_labelno
++;
3172 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3174 /* Construct the VAR_DECL associated with the constant. */
3175 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3177 DECL_ARTIFICIAL (decl
) = 1;
3178 DECL_IGNORED_P (decl
) = 1;
3179 TREE_READONLY (decl
) = 1;
3180 TREE_STATIC (decl
) = 1;
3181 TREE_ADDRESSABLE (decl
) = 1;
3182 /* We don't set the RTL yet as this would cause varpool to assume that the
3183 variable is referenced. Moreover, it would just be dropped in LTO mode.
3184 Instead we set the flag that will be recognized in make_decl_rtl. */
3185 DECL_IN_CONSTANT_POOL (decl
) = 1;
3186 DECL_INITIAL (decl
) = desc
->value
;
3187 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3188 architectures so use DATA_ALIGNMENT as well, except for strings. */
3189 if (TREE_CODE (exp
) == STRING_CST
)
3191 #ifdef CONSTANT_ALIGNMENT
3192 DECL_ALIGN (decl
) = CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
));
3196 align_variable (decl
, 0);
3198 /* Now construct the SYMBOL_REF and the MEM. */
3199 if (use_object_blocks_p ())
3201 section
*sect
= get_constant_section (exp
, DECL_ALIGN (decl
));
3202 symbol
= create_block_symbol (ggc_strdup (label
),
3203 get_block_for_section (sect
), -1);
3206 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3207 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3208 SET_SYMBOL_REF_DECL (symbol
, decl
);
3209 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3211 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3212 set_mem_attributes (rtl
, exp
, 1);
3213 set_mem_alias_set (rtl
, 0);
3214 set_mem_alias_set (rtl
, const_alias_set
);
3216 /* We cannot share RTX'es in pool entries.
3217 Mark this piece of RTL as required for unsharing. */
3218 RTX_FLAG (rtl
, used
) = 1;
3220 /* Set flags or add text to the name to record information, such as
3221 that it is a local symbol. If the name is changed, the macro
3222 ASM_OUTPUT_LABELREF will have to know how to strip this
3223 information. This call might invalidate our local variable
3224 SYMBOL; we can't use it afterward. */
3225 targetm
.encode_section_info (exp
, rtl
, true);
3232 /* Return an rtx representing a reference to constant data in memory
3233 for the constant expression EXP.
3235 If assembler code for such a constant has already been output,
3236 return an rtx to refer to it.
3237 Otherwise, output such a constant in memory
3238 and generate an rtx for it.
3240 If DEFER is nonzero, this constant can be deferred and output only
3241 if referenced in the function after all optimizations.
3243 `const_desc_table' records which constants already have label strings. */
3246 output_constant_def (tree exp
, int defer
)
3248 struct constant_descriptor_tree
*desc
;
3249 struct constant_descriptor_tree key
;
3252 /* Look up EXP in the table of constant descriptors. If we didn't find
3253 it, create a new one. */
3255 key
.hash
= const_hash_1 (exp
);
3256 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3258 desc
= (struct constant_descriptor_tree
*) *loc
;
3261 desc
= build_constant_desc (exp
);
3262 desc
->hash
= key
.hash
;
3266 maybe_output_constant_def_contents (desc
, defer
);
3270 /* Subroutine of output_constant_def: Decide whether or not we need to
3271 output the constant DESC now, and if so, do it. */
3273 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3276 rtx symbol
= XEXP (desc
->rtl
, 0);
3277 tree exp
= desc
->value
;
3279 if (flag_syntax_only
)
3282 if (TREE_ASM_WRITTEN (exp
))
3283 /* Already output; don't do it again. */
3286 /* We can always defer constants as long as the context allows
3290 /* Increment n_deferred_constants if it exists. It needs to be at
3291 least as large as the number of constants actually referred to
3292 by the function. If it's too small we'll stop looking too early
3293 and fail to emit constants; if it's too large we'll only look
3294 through the entire function when we could have stopped earlier. */
3296 n_deferred_constants
++;
3300 output_constant_def_contents (symbol
);
3303 /* Subroutine of output_constant_def_contents. Output the definition
3304 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3305 constant's alignment in bits. */
3308 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3312 size
= get_constant_size (exp
);
3314 /* Do any machine/system dependent processing of the constant. */
3315 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3317 /* Output the value of EXP. */
3318 output_constant (exp
, size
, align
);
3321 /* We must output the constant data referred to by SYMBOL; do so. */
3324 output_constant_def_contents (rtx symbol
)
3326 tree decl
= SYMBOL_REF_DECL (symbol
);
3327 tree exp
= DECL_INITIAL (decl
);
3329 bool asan_protected
= false;
3331 /* Make sure any other constants whose addresses appear in EXP
3332 are assigned label numbers. */
3333 output_addressed_constants (exp
);
3335 /* We are no longer deferring this constant. */
3336 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3338 if (flag_asan
&& TREE_CODE (exp
) == STRING_CST
3339 && asan_protect_global (exp
))
3341 asan_protected
= true;
3342 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
3343 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
3346 /* If the constant is part of an object block, make sure that the
3347 decl has been positioned within its block, but do not write out
3348 its definition yet. output_object_blocks will do that later. */
3349 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3350 place_block_symbol (symbol
);
3353 align
= DECL_ALIGN (decl
);
3354 switch_to_section (get_constant_section (exp
, align
));
3355 if (align
> BITS_PER_UNIT
)
3356 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3357 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3360 HOST_WIDE_INT size
= get_constant_size (exp
);
3361 assemble_zeros (asan_red_zone_size (size
));
3365 mudflap_enqueue_constant (exp
);
3368 /* Look up EXP in the table of constant descriptors. Return the rtl
3369 if it has been emitted, else null. */
3372 lookup_constant_def (tree exp
)
3374 struct constant_descriptor_tree
*desc
;
3375 struct constant_descriptor_tree key
;
3378 key
.hash
= const_hash_1 (exp
);
3379 desc
= (struct constant_descriptor_tree
*)
3380 htab_find_with_hash (const_desc_htab
, &key
, key
.hash
);
3382 return (desc
? desc
->rtl
: NULL_RTX
);
3385 /* Return a tree representing a reference to constant data in memory
3386 for the constant expression EXP.
3388 This is the counterpart of output_constant_def at the Tree level. */
3391 tree_output_constant_def (tree exp
)
3393 struct constant_descriptor_tree
*desc
, key
;
3397 /* Look up EXP in the table of constant descriptors. If we didn't find
3398 it, create a new one. */
3400 key
.hash
= const_hash_1 (exp
);
3401 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3403 desc
= (struct constant_descriptor_tree
*) *loc
;
3406 desc
= build_constant_desc (exp
);
3407 desc
->hash
= key
.hash
;
3411 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3412 varpool_finalize_decl (decl
);
3416 /* Used in the hash tables to avoid outputting the same constant
3417 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3418 are output once per function, not once per file. */
3419 /* ??? Only a few targets need per-function constant pools. Most
3420 can use one per-file pool. Should add a targetm bit to tell the
3423 struct GTY(()) rtx_constant_pool
{
3424 /* Pointers to first and last constant in pool, as ordered by offset. */
3425 struct constant_descriptor_rtx
*first
;
3426 struct constant_descriptor_rtx
*last
;
3428 /* Hash facility for making memory-constants from constant rtl-expressions.
3429 It is used on RISC machines where immediate integer arguments and
3430 constant addresses are restricted so that such constants must be stored
3432 htab_t
GTY((param_is (struct constant_descriptor_rtx
))) const_rtx_htab
;
3434 /* Current offset in constant pool (does not include any
3435 machine-specific header). */
3436 HOST_WIDE_INT offset
;
3439 struct GTY((chain_next ("%h.next"))) constant_descriptor_rtx
{
3440 struct constant_descriptor_rtx
*next
;
3444 HOST_WIDE_INT offset
;
3446 enum machine_mode mode
;
3452 /* Hash and compare functions for const_rtx_htab. */
3455 const_desc_rtx_hash (const void *ptr
)
3457 const struct constant_descriptor_rtx
*const desc
3458 = (const struct constant_descriptor_rtx
*) ptr
;
3463 const_desc_rtx_eq (const void *a
, const void *b
)
3465 const struct constant_descriptor_rtx
*const x
3466 = (const struct constant_descriptor_rtx
*) a
;
3467 const struct constant_descriptor_rtx
*const y
3468 = (const struct constant_descriptor_rtx
*) b
;
3470 if (x
->mode
!= y
->mode
)
3472 return rtx_equal_p (x
->constant
, y
->constant
);
3475 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3478 const_rtx_hash_1 (rtx
*xp
, void *data
)
3480 unsigned HOST_WIDE_INT hwi
;
3481 enum machine_mode mode
;
3487 code
= GET_CODE (x
);
3488 mode
= GET_MODE (x
);
3489 h
= (hashval_t
) code
* 1048573 + mode
;
3497 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3498 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3501 h
^= (hashval_t
) hwi
;
3502 for (i
= 1; i
< n
; ++i
)
3505 h
^= (hashval_t
) hwi
;
3511 if (mode
== VOIDmode
)
3513 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3517 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3521 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3527 for (i
= XVECLEN (x
, 0); i
-- > 0; )
3528 h
= h
* 251 + const_rtx_hash_1 (&XVECEXP (x
, 0, i
), data
);
3533 h
^= htab_hash_string (XSTR (x
, 0));
3537 h
= h
* 251 + CODE_LABEL_NUMBER (XEXP (x
, 0));
3541 case UNSPEC_VOLATILE
:
3542 h
= h
* 251 + XINT (x
, 1);
3549 hp
= (hashval_t
*) data
;
3550 *hp
= *hp
* 509 + h
;
3554 /* Compute a hash value for X, which should be a constant. */
3557 const_rtx_hash (rtx x
)
3560 for_each_rtx (&x
, const_rtx_hash_1
, &h
);
3565 /* Create and return a new rtx constant pool. */
3567 static struct rtx_constant_pool
*
3568 create_constant_pool (void)
3570 struct rtx_constant_pool
*pool
;
3572 pool
= ggc_alloc_rtx_constant_pool ();
3573 pool
->const_rtx_htab
= htab_create_ggc (31, const_desc_rtx_hash
,
3574 const_desc_rtx_eq
, NULL
);
3581 /* Initialize constant pool hashing for a new function. */
3584 init_varasm_status (void)
3586 crtl
->varasm
.pool
= create_constant_pool ();
3587 crtl
->varasm
.deferred_constants
= 0;
3590 /* Given a MINUS expression, simplify it if both sides
3591 include the same symbol. */
3594 simplify_subtraction (rtx x
)
3596 rtx r
= simplify_rtx (x
);
3600 /* Given a constant rtx X, make (or find) a memory constant for its value
3601 and return a MEM rtx to refer to it in memory. */
3604 force_const_mem (enum machine_mode mode
, rtx x
)
3606 struct constant_descriptor_rtx
*desc
, tmp
;
3607 struct rtx_constant_pool
*pool
;
3614 /* If we're not allowed to drop X into the constant pool, don't. */
3615 if (targetm
.cannot_force_const_mem (mode
, x
))
3618 /* Record that this function has used a constant pool entry. */
3619 crtl
->uses_const_pool
= 1;
3621 /* Decide which pool to use. */
3622 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3623 ? shared_constant_pool
3624 : crtl
->varasm
.pool
);
3626 /* Lookup the value in the hashtable. */
3629 hash
= const_rtx_hash (x
);
3630 slot
= htab_find_slot_with_hash (pool
->const_rtx_htab
, &tmp
, hash
, INSERT
);
3631 desc
= (struct constant_descriptor_rtx
*) *slot
;
3633 /* If the constant was already present, return its memory. */
3635 return copy_rtx (desc
->mem
);
3637 /* Otherwise, create a new descriptor. */
3638 desc
= ggc_alloc_constant_descriptor_rtx ();
3641 /* Align the location counter as required by EXP's data type. */
3642 gcc_checking_assert (mode
!= VOIDmode
&& mode
!= BLKmode
);
3643 align
= GET_MODE_ALIGNMENT (mode
);
3644 #ifdef CONSTANT_ALIGNMENT
3646 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3647 if (type
!= NULL_TREE
)
3648 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3652 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3653 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3656 desc
->constant
= copy_rtx (tmp
.constant
);
3657 desc
->offset
= pool
->offset
;
3660 desc
->align
= align
;
3661 desc
->labelno
= const_labelno
;
3664 pool
->offset
+= GET_MODE_SIZE (mode
);
3666 pool
->last
->next
= desc
;
3668 pool
->first
= pool
->last
= desc
;
3671 /* Create a string containing the label name, in LABEL. */
3672 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3675 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3676 the constants pool. */
3677 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3679 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3680 symbol
= create_block_symbol (ggc_strdup (label
),
3681 get_block_for_section (sect
), -1);
3684 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3686 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3687 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3688 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3690 /* Construct the MEM. */
3691 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3692 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3693 set_mem_align (def
, align
);
3695 /* If we're dropping a label to the constant pool, make sure we
3697 if (GET_CODE (x
) == LABEL_REF
)
3698 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3700 return copy_rtx (def
);
3703 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3706 get_pool_constant (rtx addr
)
3708 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3711 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3712 and whether it has been output or not. */
3715 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3717 struct constant_descriptor_rtx
*desc
;
3719 desc
= SYMBOL_REF_CONSTANT (addr
);
3720 *pmarked
= (desc
->mark
!= 0);
3721 return desc
->constant
;
3724 /* Similar, return the mode. */
3727 get_pool_mode (const_rtx addr
)
3729 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3732 /* Return the size of the constant pool. */
3735 get_pool_size (void)
3737 return crtl
->varasm
.pool
->offset
;
3740 /* Worker function for output_constant_pool_1. Emit assembly for X
3741 in MODE with known alignment ALIGN. */
3744 output_constant_pool_2 (enum machine_mode mode
, rtx x
, unsigned int align
)
3746 switch (GET_MODE_CLASS (mode
))
3749 case MODE_DECIMAL_FLOAT
:
3753 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3754 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3755 assemble_real (r
, mode
, align
);
3760 case MODE_PARTIAL_INT
:
3765 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3768 case MODE_VECTOR_FLOAT
:
3769 case MODE_VECTOR_INT
:
3770 case MODE_VECTOR_FRACT
:
3771 case MODE_VECTOR_UFRACT
:
3772 case MODE_VECTOR_ACCUM
:
3773 case MODE_VECTOR_UACCUM
:
3776 enum machine_mode submode
= GET_MODE_INNER (mode
);
3777 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3779 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3780 units
= CONST_VECTOR_NUNITS (x
);
3782 for (i
= 0; i
< units
; i
++)
3784 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3785 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3795 /* Worker function for output_constant_pool. Emit constant DESC,
3796 giving it ALIGN bits of alignment. */
3799 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3806 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3807 whose CODE_LABEL has been deleted. This can occur if a jump table
3808 is eliminated by optimization. If so, write a constant of zero
3809 instead. Note that this can also happen by turning the
3810 CODE_LABEL into a NOTE. */
3811 /* ??? This seems completely and utterly wrong. Certainly it's
3812 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3813 functioning even with INSN_DELETED_P and friends. */
3816 switch (GET_CODE (tmp
))
3819 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3820 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3822 tmp
= XEXP (XEXP (tmp
, 0), 0);
3826 tmp
= XEXP (tmp
, 0);
3827 gcc_assert (!INSN_DELETED_P (tmp
));
3828 gcc_assert (!NOTE_P (tmp
)
3829 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3836 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3837 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3838 align
, desc
->labelno
, done
);
3841 assemble_align (align
);
3843 /* Output the label. */
3844 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3846 /* Output the data. */
3847 output_constant_pool_2 (desc
->mode
, x
, align
);
3849 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3850 sections have proper size. */
3851 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3853 && (in_section
->common
.flags
& SECTION_MERGE
))
3854 assemble_align (align
);
3856 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3862 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3863 to as used. Emit referenced deferred strings. This function can
3864 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3867 mark_constant (rtx
*current_rtx
, void *data ATTRIBUTE_UNUSED
)
3869 rtx x
= *current_rtx
;
3871 if (x
== NULL_RTX
|| GET_CODE (x
) != SYMBOL_REF
)
3874 if (CONSTANT_POOL_ADDRESS_P (x
))
3876 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3877 if (desc
->mark
== 0)
3880 for_each_rtx (&desc
->constant
, mark_constant
, NULL
);
3883 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3885 tree decl
= SYMBOL_REF_DECL (x
);
3886 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
3888 n_deferred_constants
--;
3889 output_constant_def_contents (x
);
3896 /* Look through appropriate parts of INSN, marking all entries in the
3897 constant pool which are actually being used. Entries that are only
3898 referenced by other constants are also marked as used. Emit
3899 deferred strings that are used. */
3902 mark_constants (rtx insn
)
3907 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3908 insns, not any notes that may be attached. We don't want to mark
3909 a constant just because it happens to appear in a REG_EQUIV note. */
3910 if (GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3912 rtx seq
= PATTERN (insn
);
3913 int i
, n
= XVECLEN (seq
, 0);
3914 for (i
= 0; i
< n
; ++i
)
3916 rtx subinsn
= XVECEXP (seq
, 0, i
);
3917 if (INSN_P (subinsn
))
3918 for_each_rtx (&PATTERN (subinsn
), mark_constant
, NULL
);
3922 for_each_rtx (&PATTERN (insn
), mark_constant
, NULL
);
3925 /* Look through the instructions for this function, and mark all the
3926 entries in POOL which are actually being used. Emit deferred constants
3927 which have indeed been used. */
3930 mark_constant_pool (void)
3934 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
3937 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3938 mark_constants (insn
);
3941 /* Write all the constants in POOL. */
3944 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
3946 struct constant_descriptor_rtx
*desc
;
3948 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3951 /* If the constant is part of an object_block, make sure that
3952 the constant has been positioned within its block, but do not
3953 write out its definition yet. output_object_blocks will do
3955 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
3956 && SYMBOL_REF_BLOCK (desc
->sym
))
3957 place_block_symbol (desc
->sym
);
3960 switch_to_section (targetm
.asm_out
.select_rtx_section
3961 (desc
->mode
, desc
->constant
, desc
->align
));
3962 output_constant_pool_1 (desc
, desc
->align
);
3967 /* Mark all constants that are used in the current function, then write
3968 out the function's private constant pool. */
3971 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
3972 tree fndecl ATTRIBUTE_UNUSED
)
3974 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
3976 /* It is possible for gcc to call force_const_mem and then to later
3977 discard the instructions which refer to the constant. In such a
3978 case we do not need to output the constant. */
3979 mark_constant_pool ();
3981 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3982 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3985 output_constant_pool_contents (pool
);
3987 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3988 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3992 /* Write the contents of the shared constant pool. */
3995 output_shared_constant_pool (void)
3997 output_constant_pool_contents (shared_constant_pool
);
4000 /* Determine what kind of relocations EXP may need. */
4003 compute_reloc_for_constant (tree exp
)
4005 int reloc
= 0, reloc2
;
4008 switch (TREE_CODE (exp
))
4012 /* Go inside any operations that get_inner_reference can handle and see
4013 if what's inside is a constant: no need to do anything here for
4014 addresses of variables or functions. */
4015 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4016 tem
= TREE_OPERAND (tem
, 0))
4019 if (TREE_CODE (tem
) == MEM_REF
4020 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
4022 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
4026 if (TREE_PUBLIC (tem
))
4033 case POINTER_PLUS_EXPR
:
4034 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4035 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4039 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4040 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4041 /* The difference of two local labels is computable at link time. */
4042 if (reloc
== 1 && reloc2
== 1)
4049 case VIEW_CONVERT_EXPR
:
4050 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4055 unsigned HOST_WIDE_INT idx
;
4056 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4058 reloc
|= compute_reloc_for_constant (tem
);
4068 /* Find all the constants whose addresses are referenced inside of EXP,
4069 and make sure assembler code with a label has been output for each one.
4070 Indicate whether an ADDR_EXPR has been encountered. */
4073 output_addressed_constants (tree exp
)
4077 switch (TREE_CODE (exp
))
4081 /* Go inside any operations that get_inner_reference can handle and see
4082 if what's inside is a constant: no need to do anything here for
4083 addresses of variables or functions. */
4084 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4085 tem
= TREE_OPERAND (tem
, 0))
4088 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4089 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4090 tem
= DECL_INITIAL (tem
);
4092 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4093 output_constant_def (tem
, 0);
4095 if (TREE_CODE (tem
) == MEM_REF
)
4096 output_addressed_constants (TREE_OPERAND (tem
, 0));
4100 case POINTER_PLUS_EXPR
:
4102 output_addressed_constants (TREE_OPERAND (exp
, 1));
4106 case VIEW_CONVERT_EXPR
:
4107 output_addressed_constants (TREE_OPERAND (exp
, 0));
4112 unsigned HOST_WIDE_INT idx
;
4113 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4115 output_addressed_constants (tem
);
4124 /* Whether a constructor CTOR is a valid static constant initializer if all
4125 its elements are. This used to be internal to initializer_constant_valid_p
4126 and has been exposed to let other functions like categorize_ctor_elements
4127 evaluate the property while walking a constructor for other purposes. */
4130 constructor_static_from_elts_p (const_tree ctor
)
4132 return (TREE_CONSTANT (ctor
)
4133 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4134 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4135 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4138 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4141 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4142 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4143 which are valid when ENDTYPE is an integer of any size; in
4144 particular, this does not accept a pointer minus a constant. This
4145 returns null_pointer_node if the VALUE is an absolute constant
4146 which can be used to initialize a static variable. Otherwise it
4150 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4154 if (!INTEGRAL_TYPE_P (endtype
))
4157 op0
= TREE_OPERAND (value
, 0);
4158 op1
= TREE_OPERAND (value
, 1);
4160 /* Like STRIP_NOPS except allow the operand mode to widen. This
4161 works around a feature of fold that simplifies (int)(p1 - p2) to
4162 ((int)p1 - (int)p2) under the theory that the narrower operation
4165 while (CONVERT_EXPR_P (op0
)
4166 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4168 tree inner
= TREE_OPERAND (op0
, 0);
4169 if (inner
== error_mark_node
4170 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4171 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4172 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4177 while (CONVERT_EXPR_P (op1
)
4178 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4180 tree inner
= TREE_OPERAND (op1
, 0);
4181 if (inner
== error_mark_node
4182 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4183 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4184 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4189 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4193 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4194 cache
? cache
+ 2 : NULL
);
4195 /* Both initializers must be known. */
4199 && (op0
== null_pointer_node
4200 || TREE_CODE (value
) == MINUS_EXPR
))
4201 return null_pointer_node
;
4203 /* Support differences between labels. */
4204 if (TREE_CODE (op0
) == LABEL_DECL
4205 && TREE_CODE (op1
) == LABEL_DECL
)
4206 return null_pointer_node
;
4208 if (TREE_CODE (op0
) == STRING_CST
4209 && TREE_CODE (op1
) == STRING_CST
4210 && operand_equal_p (op0
, op1
, 1))
4211 return null_pointer_node
;
4217 /* Helper function of initializer_constant_valid_p.
4218 Return nonzero if VALUE is a valid constant-valued expression
4219 for use in initializing a static variable; one that can be an
4220 element of a "constant" initializer.
4222 Return null_pointer_node if the value is absolute;
4223 if it is relocatable, return the variable that determines the relocation.
4224 We assume that VALUE has been folded as much as possible;
4225 therefore, we do not need to check for such things as
4226 arithmetic-combinations of integers.
4228 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4231 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4235 switch (TREE_CODE (value
))
4238 if (constructor_static_from_elts_p (value
))
4240 unsigned HOST_WIDE_INT idx
;
4242 bool absolute
= true;
4244 if (cache
&& cache
[0] == value
)
4246 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4249 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4256 cache
[1] = NULL_TREE
;
4260 if (reloc
!= null_pointer_node
)
4263 /* For a non-absolute relocation, there is no single
4264 variable that can be "the variable that determines the
4269 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4271 return absolute
? null_pointer_node
: error_mark_node
;
4274 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4282 return null_pointer_node
;
4287 tree op0
= staticp (TREE_OPERAND (value
, 0));
4290 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4291 to be a constant, this is old-skool offsetof-like nonsense. */
4292 if (TREE_CODE (op0
) == INDIRECT_REF
4293 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4294 return null_pointer_node
;
4295 /* Taking the address of a nested function involves a trampoline,
4296 unless we don't need or want one. */
4297 if (TREE_CODE (op0
) == FUNCTION_DECL
4298 && DECL_STATIC_CHAIN (op0
)
4299 && !TREE_NO_TRAMPOLINE (value
))
4301 /* "&{...}" requires a temporary to hold the constructed
4303 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4309 case NON_LVALUE_EXPR
:
4310 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4313 case VIEW_CONVERT_EXPR
:
4315 tree src
= TREE_OPERAND (value
, 0);
4316 tree src_type
= TREE_TYPE (src
);
4317 tree dest_type
= TREE_TYPE (value
);
4319 /* Allow view-conversions from aggregate to non-aggregate type only
4320 if the bit pattern is fully preserved afterwards; otherwise, the
4321 RTL expander won't be able to apply a subsequent transformation
4322 to the underlying constructor. */
4323 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4325 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4326 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4331 /* Allow all other kinds of view-conversion. */
4332 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4337 tree src
= TREE_OPERAND (value
, 0);
4338 tree src_type
= TREE_TYPE (src
);
4339 tree dest_type
= TREE_TYPE (value
);
4341 /* Allow conversions between pointer types, floating-point
4342 types, and offset types. */
4343 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4344 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4345 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4346 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4347 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4349 /* Allow length-preserving conversions between integer types. */
4350 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4351 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4352 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4354 /* Allow conversions between other integer types only if
4356 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4358 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4359 if (inner
== null_pointer_node
)
4360 return null_pointer_node
;
4364 /* Allow (int) &foo provided int is as wide as a pointer. */
4365 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4366 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4367 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4369 /* Likewise conversions from int to pointers, but also allow
4370 conversions from 0. */
4371 if ((POINTER_TYPE_P (dest_type
)
4372 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4373 && INTEGRAL_TYPE_P (src_type
))
4375 if (TREE_CODE (src
) == INTEGER_CST
4376 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4377 return null_pointer_node
;
4378 if (integer_zerop (src
))
4379 return null_pointer_node
;
4380 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4381 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4384 /* Allow conversions to struct or union types if the value
4386 if (TREE_CODE (dest_type
) == RECORD_TYPE
4387 || TREE_CODE (dest_type
) == UNION_TYPE
)
4388 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4392 case POINTER_PLUS_EXPR
:
4394 /* Any valid floating-point constants will have been folded by now;
4395 with -frounding-math we hit this with addition of two constants. */
4396 if (TREE_CODE (endtype
) == REAL_TYPE
)
4398 if (cache
&& cache
[0] == value
)
4400 if (! INTEGRAL_TYPE_P (endtype
)
4401 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4403 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4405 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4408 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4409 endtype
, ncache
+ 2);
4410 /* If either term is absolute, use the other term's relocation. */
4411 if (valid0
== null_pointer_node
)
4413 else if (valid1
== null_pointer_node
)
4415 /* Support narrowing pointer differences. */
4417 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4421 /* Support narrowing pointer differences. */
4422 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4431 if (TREE_CODE (endtype
) == REAL_TYPE
)
4433 if (cache
&& cache
[0] == value
)
4435 if (! INTEGRAL_TYPE_P (endtype
)
4436 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4438 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4440 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4443 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4444 endtype
, ncache
+ 2);
4445 /* Win if second argument is absolute. */
4446 if (valid1
== null_pointer_node
)
4448 /* Win if both arguments have the same relocation.
4449 Then the value is absolute. */
4450 else if (valid0
== valid1
&& valid0
!= 0)
4451 ret
= null_pointer_node
;
4452 /* Since GCC guarantees that string constants are unique in the
4453 generated code, a subtraction between two copies of the same
4454 constant string is absolute. */
4455 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4456 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4457 && operand_equal_p (valid0
, valid1
, 1))
4458 ret
= null_pointer_node
;
4459 /* Support narrowing differences. */
4461 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4465 /* Support narrowing differences. */
4466 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4481 /* Return nonzero if VALUE is a valid constant-valued expression
4482 for use in initializing a static variable; one that can be an
4483 element of a "constant" initializer.
4485 Return null_pointer_node if the value is absolute;
4486 if it is relocatable, return the variable that determines the relocation.
4487 We assume that VALUE has been folded as much as possible;
4488 therefore, we do not need to check for such things as
4489 arithmetic-combinations of integers. */
4491 initializer_constant_valid_p (tree value
, tree endtype
)
4493 return initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4496 /* Return true if VALUE is a valid constant-valued expression
4497 for use in initializing a static bit-field; one that can be
4498 an element of a "constant" initializer. */
4501 initializer_constant_valid_for_bitfield_p (tree value
)
4503 /* For bitfields we support integer constants or possibly nested aggregates
4505 switch (TREE_CODE (value
))
4509 unsigned HOST_WIDE_INT idx
;
4512 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4513 if (!initializer_constant_valid_for_bitfield_p (elt
))
4522 case VIEW_CONVERT_EXPR
:
4523 case NON_LVALUE_EXPR
:
4525 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4534 /* output_constructor outer state of relevance in recursive calls, typically
4535 for nested aggregate bitfields. */
4538 unsigned int bit_offset
; /* current position in ... */
4539 int byte
; /* ... the outer byte buffer. */
4542 static unsigned HOST_WIDE_INT
4543 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int,
4546 /* Output assembler code for constant EXP, with no label.
4547 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4548 Assumes output_addressed_constants has been done on EXP already.
4550 Generate exactly SIZE bytes of assembler data, padding at the end
4551 with zeros if necessary. SIZE must always be specified.
4553 SIZE is important for structure constructors,
4554 since trailing members may have been omitted from the constructor.
4555 It is also important for initialization of arrays from string constants
4556 since the full length of the string constant might not be wanted.
4557 It is also needed for initialization of unions, where the initializer's
4558 type is just one member, and that may not be as long as the union.
4560 There a case in which we would fail to output exactly SIZE bytes:
4561 for a structure constructor that wants to produce more than SIZE bytes.
4562 But such constructors will never be generated for any possible input.
4564 ALIGN is the alignment of the data in bits. */
4567 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4569 enum tree_code code
;
4570 unsigned HOST_WIDE_INT thissize
;
4572 if (size
== 0 || flag_syntax_only
)
4575 /* See if we're trying to initialize a pointer in a non-default mode
4576 to the address of some declaration somewhere. If the target says
4577 the mode is valid for pointers, assume the target has a way of
4579 if (TREE_CODE (exp
) == NOP_EXPR
4580 && POINTER_TYPE_P (TREE_TYPE (exp
))
4581 && targetm
.addr_space
.valid_pointer_mode
4582 (TYPE_MODE (TREE_TYPE (exp
)),
4583 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4585 tree saved_type
= TREE_TYPE (exp
);
4587 /* Peel off any intermediate conversions-to-pointer for valid
4589 while (TREE_CODE (exp
) == NOP_EXPR
4590 && POINTER_TYPE_P (TREE_TYPE (exp
))
4591 && targetm
.addr_space
.valid_pointer_mode
4592 (TYPE_MODE (TREE_TYPE (exp
)),
4593 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4594 exp
= TREE_OPERAND (exp
, 0);
4596 /* If what we're left with is the address of something, we can
4597 convert the address to the final type and output it that
4599 if (TREE_CODE (exp
) == ADDR_EXPR
)
4600 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4601 /* Likewise for constant ints. */
4602 else if (TREE_CODE (exp
) == INTEGER_CST
)
4603 exp
= build_int_cst_wide (saved_type
, TREE_INT_CST_LOW (exp
),
4604 TREE_INT_CST_HIGH (exp
));
4608 /* Eliminate any conversions since we'll be outputting the underlying
4610 while (CONVERT_EXPR_P (exp
)
4611 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4612 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4614 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4615 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4617 /* Make sure eliminating the conversion is really a no-op, except with
4618 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4619 union types to allow for Ada unchecked unions. */
4620 if (type_size
> op_size
4621 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4622 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4623 /* Keep the conversion. */
4626 exp
= TREE_OPERAND (exp
, 0);
4629 code
= TREE_CODE (TREE_TYPE (exp
));
4630 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4632 /* Allow a constructor with no elements for any data type.
4633 This means to fill the space with zeros. */
4634 if (TREE_CODE (exp
) == CONSTRUCTOR
4635 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4637 assemble_zeros (size
);
4641 if (TREE_CODE (exp
) == FDESC_EXPR
)
4643 #ifdef ASM_OUTPUT_FDESC
4644 HOST_WIDE_INT part
= tree_low_cst (TREE_OPERAND (exp
, 1), 0);
4645 tree decl
= TREE_OPERAND (exp
, 0);
4646 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4653 /* Now output the underlying data. If we've handling the padding, return.
4654 Otherwise, break and ensure SIZE is the size written. */
4661 case REFERENCE_TYPE
:
4663 case FIXED_POINT_TYPE
:
4664 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4665 EXPAND_INITIALIZER
),
4666 MIN (size
, thissize
), align
, 0))
4667 error ("initializer for integer/fixed-point value is too complicated");
4671 if (TREE_CODE (exp
) != REAL_CST
)
4672 error ("initializer for floating value is not a floating constant");
4674 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4678 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4679 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4680 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4685 switch (TREE_CODE (exp
))
4688 output_constructor (exp
, size
, align
, NULL
);
4692 = MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
), size
);
4693 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4697 enum machine_mode inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4698 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4699 int elt_size
= GET_MODE_SIZE (inner
);
4700 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
);
4701 thissize
= elt_size
;
4702 for (unsigned int i
= 1; i
< VECTOR_CST_NELTS (exp
); i
++)
4704 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
);
4705 thissize
+= elt_size
;
4716 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4717 output_constructor (exp
, size
, align
, NULL
);
4727 if (size
> thissize
)
4728 assemble_zeros (size
- thissize
);
4732 /* Subroutine of output_constructor, used for computing the size of
4733 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4734 type with an unspecified upper bound. */
4736 static unsigned HOST_WIDE_INT
4737 array_size_for_constructor (tree val
)
4740 unsigned HOST_WIDE_INT cnt
;
4741 tree index
, value
, tmp
;
4744 /* This code used to attempt to handle string constants that are not
4745 arrays of single-bytes, but nothing else does, so there's no point in
4747 if (TREE_CODE (val
) == STRING_CST
)
4748 return TREE_STRING_LENGTH (val
);
4750 max_index
= NULL_TREE
;
4751 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4753 if (TREE_CODE (index
) == RANGE_EXPR
)
4754 index
= TREE_OPERAND (index
, 1);
4755 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4759 if (max_index
== NULL_TREE
)
4762 /* Compute the total number of array elements. */
4763 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4764 i
= tree_to_double_int (max_index
) - tree_to_double_int (tmp
);
4765 i
+= double_int_one
;
4767 /* Multiply by the array element unit size to find number of bytes. */
4768 i
*= tree_to_double_int (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4770 gcc_assert (i
.fits_uhwi ());
4774 /* Other datastructures + helpers for output_constructor. */
4776 /* output_constructor local state to support interaction with helpers. */
4780 /* Received arguments. */
4781 tree exp
; /* Constructor expression. */
4782 tree type
; /* Type of constructor expression. */
4783 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4784 unsigned int align
; /* Known initial alignment. */
4785 tree min_index
; /* Lower bound if specified for an array. */
4787 /* Output processing state. */
4788 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4789 int byte
; /* Part of a bitfield byte yet to be output. */
4790 int last_relative_index
; /* Implicit or explicit index of the last
4791 array element output within a bitfield. */
4792 bool byte_buffer_in_use
; /* Whether BYTE is in use. */
4794 /* Current element. */
4795 tree field
; /* Current field decl in a record. */
4796 tree val
; /* Current element value. */
4797 tree index
; /* Current element index. */
4801 /* Helper for output_constructor. From the current LOCAL state, output a
4802 RANGE_EXPR element. */
4805 output_constructor_array_range (oc_local_state
*local
)
4807 unsigned HOST_WIDE_INT fieldsize
4808 = int_size_in_bytes (TREE_TYPE (local
->type
));
4810 HOST_WIDE_INT lo_index
4811 = tree_low_cst (TREE_OPERAND (local
->index
, 0), 0);
4812 HOST_WIDE_INT hi_index
4813 = tree_low_cst (TREE_OPERAND (local
->index
, 1), 0);
4814 HOST_WIDE_INT index
;
4817 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4819 for (index
= lo_index
; index
<= hi_index
; index
++)
4821 /* Output the element's initial value. */
4822 if (local
->val
== NULL_TREE
)
4823 assemble_zeros (fieldsize
);
4825 output_constant (local
->val
, fieldsize
, align2
);
4827 /* Count its size. */
4828 local
->total_bytes
+= fieldsize
;
4832 /* Helper for output_constructor. From the current LOCAL state, output a
4833 field element that is not true bitfield or part of an outer one. */
4836 output_constructor_regular_field (oc_local_state
*local
)
4838 /* Field size and position. Since this structure is static, we know the
4839 positions are constant. */
4840 unsigned HOST_WIDE_INT fieldsize
;
4841 HOST_WIDE_INT fieldpos
;
4843 unsigned int align2
;
4845 if (local
->index
!= NULL_TREE
)
4847 /* Perform the index calculation in modulo arithmetic but
4848 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4849 but we are using an unsigned sizetype. */
4850 unsigned prec
= TYPE_PRECISION (sizetype
);
4851 double_int idx
= tree_to_double_int (local
->index
)
4852 - tree_to_double_int (local
->min_index
);
4853 idx
= idx
.sext (prec
);
4854 fieldpos
= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
)), 1)
4857 else if (local
->field
!= NULL_TREE
)
4858 fieldpos
= int_byte_position (local
->field
);
4862 /* Output any buffered-up bit-fields preceding this element. */
4863 if (local
->byte_buffer_in_use
)
4865 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4866 local
->total_bytes
++;
4867 local
->byte_buffer_in_use
= false;
4870 /* Advance to offset of this element.
4871 Note no alignment needed in an array, since that is guaranteed
4872 if each element has the proper size. */
4873 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4874 && fieldpos
!= local
->total_bytes
)
4876 gcc_assert (fieldpos
>= local
->total_bytes
);
4877 assemble_zeros (fieldpos
- local
->total_bytes
);
4878 local
->total_bytes
= fieldpos
;
4881 /* Find the alignment of this element. */
4882 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
4884 /* Determine size this element should occupy. */
4889 /* If this is an array with an unspecified upper bound,
4890 the initializer determines the size. */
4891 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4892 but we cannot do this until the deprecated support for
4893 initializing zero-length array members is removed. */
4894 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
4895 && TYPE_DOMAIN (TREE_TYPE (local
->field
))
4896 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
))))
4898 fieldsize
= array_size_for_constructor (local
->val
);
4899 /* Given a non-empty initialization, this field had
4901 gcc_assert (!fieldsize
|| !DECL_CHAIN (local
->field
));
4904 fieldsize
= tree_low_cst (DECL_SIZE_UNIT (local
->field
), 1);
4907 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
4909 /* Output the element's initial value. */
4910 if (local
->val
== NULL_TREE
)
4911 assemble_zeros (fieldsize
);
4913 output_constant (local
->val
, fieldsize
, align2
);
4915 /* Count its size. */
4916 local
->total_bytes
+= fieldsize
;
4919 /* Helper for output_constructor. From the LOCAL state, output an element
4920 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
4921 from the start of a possibly ongoing outer byte buffer. */
4924 output_constructor_bitfield (oc_local_state
*local
, unsigned int bit_offset
)
4926 /* Bit size of this element. */
4927 HOST_WIDE_INT ebitsize
4929 ? tree_low_cst (DECL_SIZE (local
->field
), 1)
4930 : tree_low_cst (TYPE_SIZE (TREE_TYPE (local
->type
)), 1));
4932 /* Relative index of this element if this is an array component. */
4933 HOST_WIDE_INT relative_index
4936 ? (tree_low_cst (local
->index
, 0)
4937 - tree_low_cst (local
->min_index
, 0))
4938 : local
->last_relative_index
+ 1)
4941 /* Bit position of this element from the start of the containing
4943 HOST_WIDE_INT constructor_relative_ebitpos
4945 ? int_bit_position (local
->field
)
4946 : ebitsize
* relative_index
);
4948 /* Bit position of this element from the start of a possibly ongoing
4949 outer byte buffer. */
4950 HOST_WIDE_INT byte_relative_ebitpos
4951 = bit_offset
+ constructor_relative_ebitpos
;
4953 /* From the start of a possibly ongoing outer byte buffer, offsets to
4954 the first bit of this element and to the first bit past the end of
4956 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
4957 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
4959 local
->last_relative_index
= relative_index
;
4961 if (local
->val
== NULL_TREE
)
4962 local
->val
= integer_zero_node
;
4964 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
4965 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
4966 local
->val
= TREE_OPERAND (local
->val
, 0);
4968 if (TREE_CODE (local
->val
) != INTEGER_CST
4969 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
4971 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
4975 /* If this field does not start in this (or next) byte, skip some bytes. */
4976 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4978 /* Output remnant of any bit field in previous bytes. */
4979 if (local
->byte_buffer_in_use
)
4981 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4982 local
->total_bytes
++;
4983 local
->byte_buffer_in_use
= false;
4986 /* If still not at proper byte, advance to there. */
4987 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4989 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
4990 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
4991 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
4995 /* Set up the buffer if necessary. */
4996 if (!local
->byte_buffer_in_use
)
5000 local
->byte_buffer_in_use
= true;
5003 /* If this is nested constructor, recurse passing the bit offset and the
5004 pending data, then retrieve the new pending data afterwards. */
5005 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
5007 oc_outer_state temp_state
;
5008 temp_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
5009 temp_state
.byte
= local
->byte
;
5011 += output_constructor (local
->val
, 0, 0, &temp_state
);
5012 local
->byte
= temp_state
.byte
;
5016 /* Otherwise, we must split the element into pieces that fall within
5017 separate bytes, and combine each byte with previous or following
5019 while (next_offset
< end_offset
)
5023 HOST_WIDE_INT value
;
5024 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
5025 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
5027 /* Advance from byte to byte within this element when necessary. */
5028 while (next_byte
!= local
->total_bytes
)
5030 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5031 local
->total_bytes
++;
5035 /* Number of bits we can process at once (all part of the same byte). */
5036 this_time
= MIN (end_offset
- next_offset
, BITS_PER_UNIT
- next_bit
);
5037 if (BYTES_BIG_ENDIAN
)
5039 /* On big-endian machine, take the most significant bits
5040 first (of the bits that are significant)
5041 and put them into bytes from the most significant end. */
5042 shift
= end_offset
- next_offset
- this_time
;
5044 /* Don't try to take a bunch of bits that cross
5045 the word boundary in the INTEGER_CST. We can
5046 only select bits from the LOW or HIGH part
5048 if (shift
< HOST_BITS_PER_WIDE_INT
5049 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
5051 this_time
= shift
+ this_time
- HOST_BITS_PER_WIDE_INT
;
5052 shift
= HOST_BITS_PER_WIDE_INT
;
5055 /* Now get the bits from the appropriate constant word. */
5056 if (shift
< HOST_BITS_PER_WIDE_INT
)
5057 value
= TREE_INT_CST_LOW (local
->val
);
5060 gcc_assert (shift
< HOST_BITS_PER_DOUBLE_INT
);
5061 value
= TREE_INT_CST_HIGH (local
->val
);
5062 shift
-= HOST_BITS_PER_WIDE_INT
;
5065 /* Get the result. This works only when:
5066 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5067 local
->byte
|= (((value
>> shift
)
5068 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5069 << (BITS_PER_UNIT
- this_time
- next_bit
));
5073 /* On little-endian machines,
5074 take first the least significant bits of the value
5075 and pack them starting at the least significant
5076 bits of the bytes. */
5077 shift
= next_offset
- byte_relative_ebitpos
;
5079 /* Don't try to take a bunch of bits that cross
5080 the word boundary in the INTEGER_CST. We can
5081 only select bits from the LOW or HIGH part
5083 if (shift
< HOST_BITS_PER_WIDE_INT
5084 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
5085 this_time
= (HOST_BITS_PER_WIDE_INT
- shift
);
5087 /* Now get the bits from the appropriate constant word. */
5088 if (shift
< HOST_BITS_PER_WIDE_INT
)
5089 value
= TREE_INT_CST_LOW (local
->val
);
5092 gcc_assert (shift
< HOST_BITS_PER_DOUBLE_INT
);
5093 value
= TREE_INT_CST_HIGH (local
->val
);
5094 shift
-= HOST_BITS_PER_WIDE_INT
;
5097 /* Get the result. This works only when:
5098 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5099 local
->byte
|= (((value
>> shift
)
5100 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5104 next_offset
+= this_time
;
5105 local
->byte_buffer_in_use
= true;
5109 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5110 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5111 caller output state of relevance in recursive invocations. */
5113 static unsigned HOST_WIDE_INT
5114 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
5115 unsigned int align
, oc_outer_state
*outer
)
5117 unsigned HOST_WIDE_INT cnt
;
5118 constructor_elt
*ce
;
5120 oc_local_state local
;
5122 /* Setup our local state to communicate with helpers. */
5124 local
.type
= TREE_TYPE (exp
);
5126 local
.align
= align
;
5127 if (TREE_CODE (local
.type
) == ARRAY_TYPE
&& TYPE_DOMAIN (local
.type
))
5128 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5130 local
.min_index
= NULL_TREE
;
5132 local
.total_bytes
= 0;
5133 local
.byte_buffer_in_use
= outer
!= NULL
;
5134 local
.byte
= outer
? outer
->byte
: 0;
5136 local
.last_relative_index
= -1;
5138 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5140 /* As CE goes through the elements of the constant, FIELD goes through the
5141 structure fields if the constant is a structure. If the constant is a
5142 union, we override this by getting the field from the TREE_LIST element.
5143 But the constant could also be an array. Then FIELD is zero.
5145 There is always a maximum of one element in the chain LINK for unions
5146 (even if the initializer in a source program incorrectly contains
5149 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5150 local
.field
= TYPE_FIELDS (local
.type
);
5152 local
.field
= NULL_TREE
;
5155 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5156 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5158 local
.val
= ce
->value
;
5159 local
.index
= NULL_TREE
;
5161 /* The element in a union constructor specifies the proper field
5163 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5164 local
.field
= ce
->index
;
5166 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5167 local
.index
= ce
->index
;
5169 if (local
.field
&& flag_verbose_asm
)
5170 fprintf (asm_out_file
, "%s %s:\n",
5172 DECL_NAME (local
.field
)
5173 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5176 /* Eliminate the marker that makes a cast not be an lvalue. */
5177 if (local
.val
!= NULL_TREE
)
5178 STRIP_NOPS (local
.val
);
5180 /* Output the current element, using the appropriate helper ... */
5182 /* For an array slice not part of an outer bitfield. */
5184 && local
.index
!= NULL_TREE
5185 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5186 output_constructor_array_range (&local
);
5188 /* For a field that is neither a true bitfield nor part of an outer one,
5189 known to be at least byte aligned and multiple-of-bytes long. */
5191 && (local
.field
== NULL_TREE
5192 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5193 output_constructor_regular_field (&local
);
5195 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5196 supported for scalar fields, so we may need to convert first. */
5199 if (TREE_CODE (local
.val
) == REAL_CST
)
5201 = fold_unary (VIEW_CONVERT_EXPR
,
5202 build_nonstandard_integer_type
5203 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5205 output_constructor_bitfield (&local
, outer
? outer
->bit_offset
: 0);
5209 /* If we are not at toplevel, save the pending data for our caller.
5210 Otherwise output the pending data and padding zeros as needed. */
5212 outer
->byte
= local
.byte
;
5215 if (local
.byte_buffer_in_use
)
5217 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5218 local
.total_bytes
++;
5221 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5223 assemble_zeros (local
.size
- local
.total_bytes
);
5224 local
.total_bytes
= local
.size
;
5228 return local
.total_bytes
;
5231 /* Mark DECL as weak. */
5234 mark_weak (tree decl
)
5236 DECL_WEAK (decl
) = 1;
5238 if (DECL_RTL_SET_P (decl
)
5239 && MEM_P (DECL_RTL (decl
))
5240 && XEXP (DECL_RTL (decl
), 0)
5241 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5242 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5245 /* Merge weak status between NEWDECL and OLDDECL. */
5248 merge_weak (tree newdecl
, tree olddecl
)
5250 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5252 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5255 /* We put the NEWDECL on the weak_decls list at some point
5256 and OLDDECL as well. Keep just OLDDECL on the list. */
5257 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5258 if (TREE_VALUE (*pwd
) == newdecl
)
5260 *pwd
= TREE_CHAIN (*pwd
);
5267 if (DECL_WEAK (newdecl
))
5271 /* NEWDECL is weak, but OLDDECL is not. */
5273 /* If we already output the OLDDECL, we're in trouble; we can't
5274 go back and make it weak. This should never happen in
5275 unit-at-a-time compilation. */
5276 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5278 /* If we've already generated rtl referencing OLDDECL, we may
5279 have done so in a way that will not function properly with
5280 a weak symbol. Again in unit-at-a-time this should be
5282 gcc_assert (!TREE_USED (olddecl
)
5283 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5285 if (TARGET_SUPPORTS_WEAK
)
5287 /* We put the NEWDECL on the weak_decls list at some point.
5288 Replace it with the OLDDECL. */
5289 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5290 if (TREE_VALUE (wd
) == newdecl
)
5292 TREE_VALUE (wd
) = olddecl
;
5295 /* We may not find the entry on the list. If NEWDECL is a
5296 weak alias, then we will have already called
5297 globalize_decl to remove the entry; in that case, we do
5298 not need to do anything. */
5301 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5302 mark_weak (olddecl
);
5305 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5306 weak. Just update NEWDECL to indicate that it's weak too. */
5307 mark_weak (newdecl
);
5310 /* Declare DECL to be a weak symbol. */
5313 declare_weak (tree decl
)
5315 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5316 if (! TREE_PUBLIC (decl
))
5317 error ("weak declaration of %q+D must be public", decl
);
5318 else if (!TARGET_SUPPORTS_WEAK
)
5319 warning (0, "weak declaration of %q+D not supported", decl
);
5322 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5323 DECL_ATTRIBUTES (decl
)
5324 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5328 weak_finish_1 (tree decl
)
5330 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5331 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5334 if (! TREE_USED (decl
))
5337 #ifdef ASM_WEAKEN_DECL
5338 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5340 #ifdef ASM_WEAKEN_LABEL
5341 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5343 #ifdef ASM_OUTPUT_WEAK_ALIAS
5345 static bool warn_once
= 0;
5348 warning (0, "only weak aliases are supported in this configuration");
5358 /* Fiven an assembly name, find the decl it is associated with. */
5360 find_decl (tree target
)
5362 symtab_node node
= symtab_node_for_asm (target
);
5364 return node
->symbol
.decl
;
5368 /* This TREE_LIST contains weakref targets. */
5370 static GTY(()) tree weakref_targets
;
5372 /* Emit any pending weak declarations. */
5379 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5381 tree alias_decl
= TREE_PURPOSE (t
);
5382 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5384 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5385 /* Remove alias_decl from the weak list, but leave entries for
5386 the target alone. */
5388 #ifndef ASM_OUTPUT_WEAKREF
5389 else if (! TREE_SYMBOL_REFERENCED (target
))
5391 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5392 defined, otherwise we and weak_finish_1 would use
5393 different macros. */
5394 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5395 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5397 tree decl
= find_decl (target
);
5401 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5402 TREE_CODE (alias_decl
), target
,
5403 TREE_TYPE (alias_decl
));
5405 DECL_EXTERNAL (decl
) = 1;
5406 TREE_PUBLIC (decl
) = 1;
5407 DECL_ARTIFICIAL (decl
) = 1;
5408 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5409 TREE_USED (decl
) = 1;
5412 weak_finish_1 (decl
);
5421 /* Remove the alias and the target from the pending weak list
5422 so that we do not emit any .weak directives for the former,
5423 nor multiple .weak directives for the latter. */
5424 for (p
= &weak_decls
; (t2
= *p
) ; )
5426 if (TREE_VALUE (t2
) == alias_decl
5427 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5428 *p
= TREE_CHAIN (t2
);
5430 p
= &TREE_CHAIN (t2
);
5433 /* Remove other weakrefs to the same target, to speed things up. */
5434 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5436 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5437 *p
= TREE_CHAIN (t2
);
5439 p
= &TREE_CHAIN (t2
);
5444 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5446 tree decl
= TREE_VALUE (t
);
5448 weak_finish_1 (decl
);
5452 /* Emit the assembly bits to indicate that DECL is globally visible. */
5455 globalize_decl (tree decl
)
5458 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5459 if (DECL_WEAK (decl
))
5461 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5464 #ifdef ASM_WEAKEN_DECL
5465 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5467 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5470 /* Remove this function from the pending weak list so that
5471 we do not emit multiple .weak directives for it. */
5472 for (p
= &weak_decls
; (t
= *p
) ; )
5474 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5475 *p
= TREE_CHAIN (t
);
5477 p
= &TREE_CHAIN (t
);
5480 /* Remove weakrefs to the same target from the pending weakref
5481 list, for the same reason. */
5482 for (p
= &weakref_targets
; (t
= *p
) ; )
5484 if (DECL_ASSEMBLER_NAME (decl
)
5485 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5486 *p
= TREE_CHAIN (t
);
5488 p
= &TREE_CHAIN (t
);
5495 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5498 vec
<alias_pair
, va_gc
> *alias_pairs
;
5500 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5501 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5502 tree node is DECL to have the value of the tree node TARGET. */
5505 do_assemble_alias (tree decl
, tree target
)
5507 /* Emulated TLS had better not get this var. */
5508 gcc_assert(!(!targetm
.have_tls
5509 && TREE_CODE (decl
) == VAR_DECL
5510 && DECL_THREAD_LOCAL_P (decl
)));
5512 if (TREE_ASM_WRITTEN (decl
))
5515 /* We must force creation of DECL_RTL for debug info generation, even though
5516 we don't use it here. */
5517 make_decl_rtl (decl
);
5519 TREE_ASM_WRITTEN (decl
) = 1;
5520 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5522 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5524 ultimate_transparent_alias_target (&target
);
5526 if (!TREE_SYMBOL_REFERENCED (target
))
5527 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5529 #ifdef ASM_OUTPUT_WEAKREF
5530 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5531 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5532 IDENTIFIER_POINTER (target
));
5534 if (!TARGET_SUPPORTS_WEAK
)
5536 error_at (DECL_SOURCE_LOCATION (decl
),
5537 "weakref is not supported in this configuration");
5544 #ifdef ASM_OUTPUT_DEF
5545 /* Make name accessible from other files, if appropriate. */
5547 if (TREE_PUBLIC (decl
))
5549 globalize_decl (decl
);
5550 maybe_assemble_visibility (decl
);
5552 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5554 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5555 if (targetm
.has_ifunc_p ())
5556 ASM_OUTPUT_TYPE_DIRECTIVE
5557 (asm_out_file
, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5561 error_at (DECL_SOURCE_LOCATION (decl
),
5562 "ifunc is not supported on this target");
5565 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5566 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5568 ASM_OUTPUT_DEF (asm_out_file
,
5569 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5570 IDENTIFIER_POINTER (target
));
5572 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5577 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5578 # ifdef ASM_WEAKEN_DECL
5579 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5581 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5583 /* Remove this function from the pending weak list so that
5584 we do not emit multiple .weak directives for it. */
5585 for (p
= &weak_decls
; (t
= *p
) ; )
5586 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5587 *p
= TREE_CHAIN (t
);
5589 p
= &TREE_CHAIN (t
);
5591 /* Remove weakrefs to the same target from the pending weakref
5592 list, for the same reason. */
5593 for (p
= &weakref_targets
; (t
= *p
) ; )
5595 if (DECL_ASSEMBLER_NAME (decl
)
5596 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5597 *p
= TREE_CHAIN (t
);
5599 p
= &TREE_CHAIN (t
);
5605 /* Emit an assembler directive to make the symbol for DECL an alias to
5606 the symbol for TARGET. */
5609 assemble_alias (tree decl
, tree target
)
5613 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5615 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5617 ultimate_transparent_alias_target (&target
);
5619 if (alias
== target
)
5620 error ("weakref %q+D ultimately targets itself", decl
);
5621 if (TREE_PUBLIC (decl
))
5622 error ("weakref %q+D must have static linkage", decl
);
5626 #if !defined (ASM_OUTPUT_DEF)
5627 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5628 error_at (DECL_SOURCE_LOCATION (decl
),
5629 "alias definitions not supported in this configuration");
5632 if (!DECL_WEAK (decl
))
5634 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5635 error_at (DECL_SOURCE_LOCATION (decl
),
5636 "ifunc is not supported in this configuration");
5638 error_at (DECL_SOURCE_LOCATION (decl
),
5639 "only weak aliases are supported in this configuration");
5645 TREE_USED (decl
) = 1;
5647 /* Allow aliases to aliases. */
5648 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5649 cgraph_get_create_node (decl
)->symbol
.alias
= true;
5651 varpool_node_for_decl (decl
)->symbol
.alias
= true;
5653 /* If the target has already been emitted, we don't have to queue the
5654 alias. This saves a tad of memory. */
5655 if (cgraph_global_info_ready
)
5656 target_decl
= find_decl (target
);
5659 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5660 || cgraph_state
>= CGRAPH_STATE_EXPANSION
)
5661 do_assemble_alias (decl
, target
);
5664 alias_pair p
= {decl
, target
};
5665 vec_safe_push (alias_pairs
, p
);
5669 /* Record and output a table of translations from original function
5670 to its transaction aware clone. Note that tm_pure functions are
5671 considered to be their own clone. */
5673 static GTY((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
5674 htab_t tm_clone_hash
;
5677 record_tm_clone_pair (tree o
, tree n
)
5679 struct tree_map
**slot
, *h
;
5681 if (tm_clone_hash
== NULL
)
5682 tm_clone_hash
= htab_create_ggc (32, tree_map_hash
, tree_map_eq
, 0);
5684 h
= ggc_alloc_tree_map ();
5685 h
->hash
= htab_hash_pointer (o
);
5689 slot
= (struct tree_map
**)
5690 htab_find_slot_with_hash (tm_clone_hash
, h
, h
->hash
, INSERT
);
5695 get_tm_clone_pair (tree o
)
5699 struct tree_map
*h
, in
;
5702 in
.hash
= htab_hash_pointer (o
);
5703 h
= (struct tree_map
*) htab_find_with_hash (tm_clone_hash
,
5711 typedef struct tm_alias_pair
5719 /* Helper function for finish_tm_clone_pairs. Dump a hash table entry
5720 into a VEC in INFO. */
5723 dump_tm_clone_to_vec (void **slot
, void *info
)
5725 struct tree_map
*map
= (struct tree_map
*) *slot
;
5726 vec
<tm_alias_pair
> *tm_alias_pairs
= (vec
<tm_alias_pair
> *) info
;
5727 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5728 tm_alias_pairs
->safe_push (p
);
5732 /* Dump the actual pairs to the .tm_clone_table section. */
5735 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5739 bool switched
= false;
5741 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5745 struct cgraph_node
*src_n
= cgraph_get_node (src
);
5746 struct cgraph_node
*dst_n
= cgraph_get_node (dst
);
5748 /* The function ipa_tm_create_version() marks the clone as needed if
5749 the original function was needed. But we also mark the clone as
5750 needed if we ever called the clone indirectly through
5751 TM_GETTMCLONE. If neither of these are true, we didn't generate
5752 a clone, and we didn't call it indirectly... no sense keeping it
5753 in the clone table. */
5754 if (!dst_n
|| !dst_n
->symbol
.definition
)
5757 /* This covers the case where we have optimized the original
5758 function away, and only access the transactional clone. */
5759 if (!src_n
|| !src_n
->symbol
.definition
)
5764 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5765 assemble_align (POINTER_SIZE
);
5769 assemble_integer (XEXP (DECL_RTL (src
), 0),
5770 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5771 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5772 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5776 /* Provide a default for the tm_clone_table section. */
5779 default_clone_table_section (void)
5781 return get_named_section (NULL
, ".tm_clone_table", 3);
5784 /* Helper comparison function for qsorting by the DECL_UID stored in
5785 alias_pair->emitted_diags. */
5788 tm_alias_pair_cmp (const void *x
, const void *y
)
5790 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5791 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5792 if (p1
->uid
< p2
->uid
)
5794 if (p1
->uid
> p2
->uid
)
5800 finish_tm_clone_pairs (void)
5802 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5804 if (tm_clone_hash
== NULL
)
5807 /* We need a determenistic order for the .tm_clone_table, otherwise
5808 we will get bootstrap comparison failures, so dump the hash table
5809 to a vector, sort it, and dump the vector. */
5811 /* Dump the hashtable to a vector. */
5812 htab_traverse_noresize (tm_clone_hash
, dump_tm_clone_to_vec
,
5813 (void *) &tm_alias_pairs
);
5815 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5818 dump_tm_clone_pairs (tm_alias_pairs
);
5820 htab_delete (tm_clone_hash
);
5821 tm_clone_hash
= NULL
;
5822 tm_alias_pairs
.release ();
5826 /* Emit an assembler directive to set symbol for DECL visibility to
5827 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5830 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5831 int vis ATTRIBUTE_UNUSED
)
5833 #ifdef HAVE_GAS_HIDDEN
5834 static const char * const visibility_types
[] = {
5835 NULL
, "protected", "hidden", "internal"
5838 const char *name
, *type
;
5840 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5841 type
= visibility_types
[vis
];
5843 fprintf (asm_out_file
, "\t.%s\t", type
);
5844 assemble_name (asm_out_file
, name
);
5845 fprintf (asm_out_file
, "\n");
5847 if (!DECL_ARTIFICIAL (decl
))
5848 warning (OPT_Wattributes
, "visibility attribute not supported "
5849 "in this configuration; ignored");
5853 /* A helper function to call assemble_visibility when needed for a decl. */
5856 maybe_assemble_visibility (tree decl
)
5858 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5860 if (vis
!= VISIBILITY_DEFAULT
)
5862 targetm
.asm_out
.assemble_visibility (decl
, vis
);
5869 /* Returns 1 if the target configuration supports defining public symbols
5870 so that one of them will be chosen at link time instead of generating a
5871 multiply-defined symbol error, whether through the use of weak symbols or
5872 a target-specific mechanism for having duplicates discarded. */
5875 supports_one_only (void)
5877 if (SUPPORTS_ONE_ONLY
)
5879 return TARGET_SUPPORTS_WEAK
;
5882 /* Set up DECL as a public symbol that can be defined in multiple
5883 translation units without generating a linker error. */
5886 make_decl_one_only (tree decl
, tree comdat_group
)
5888 gcc_assert (TREE_CODE (decl
) == VAR_DECL
5889 || TREE_CODE (decl
) == FUNCTION_DECL
);
5891 TREE_PUBLIC (decl
) = 1;
5893 if (SUPPORTS_ONE_ONLY
)
5895 #ifdef MAKE_DECL_ONE_ONLY
5896 MAKE_DECL_ONE_ONLY (decl
);
5898 DECL_COMDAT_GROUP (decl
) = comdat_group
;
5900 else if (TREE_CODE (decl
) == VAR_DECL
5901 && (DECL_INITIAL (decl
) == 0 || DECL_INITIAL (decl
) == error_mark_node
))
5902 DECL_COMMON (decl
) = 1;
5905 gcc_assert (TARGET_SUPPORTS_WEAK
);
5906 DECL_WEAK (decl
) = 1;
5911 init_varasm_once (void)
5913 section_htab
= htab_create_ggc (31, section_entry_hash
,
5914 section_entry_eq
, NULL
);
5915 object_block_htab
= htab_create_ggc (31, object_block_entry_hash
,
5916 object_block_entry_eq
, NULL
);
5917 const_desc_htab
= htab_create_ggc (1009, const_desc_hash
,
5918 const_desc_eq
, NULL
);
5920 const_alias_set
= new_alias_set ();
5921 shared_constant_pool
= create_constant_pool ();
5923 #ifdef TEXT_SECTION_ASM_OP
5924 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
5925 TEXT_SECTION_ASM_OP
);
5928 #ifdef DATA_SECTION_ASM_OP
5929 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5930 DATA_SECTION_ASM_OP
);
5933 #ifdef SDATA_SECTION_ASM_OP
5934 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5935 SDATA_SECTION_ASM_OP
);
5938 #ifdef READONLY_DATA_SECTION_ASM_OP
5939 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
5940 READONLY_DATA_SECTION_ASM_OP
);
5943 #ifdef CTORS_SECTION_ASM_OP
5944 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
5945 CTORS_SECTION_ASM_OP
);
5948 #ifdef DTORS_SECTION_ASM_OP
5949 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
5950 DTORS_SECTION_ASM_OP
);
5953 #ifdef BSS_SECTION_ASM_OP
5954 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5955 output_section_asm_op
,
5956 BSS_SECTION_ASM_OP
);
5959 #ifdef SBSS_SECTION_ASM_OP
5960 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5961 output_section_asm_op
,
5962 SBSS_SECTION_ASM_OP
);
5965 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5966 | SECTION_COMMON
, emit_tls_common
);
5967 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5968 | SECTION_COMMON
, emit_local
);
5969 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5970 | SECTION_COMMON
, emit_common
);
5972 #if defined ASM_OUTPUT_ALIGNED_BSS
5973 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
5977 targetm
.asm_out
.init_sections ();
5979 if (readonly_data_section
== NULL
)
5980 readonly_data_section
= text_section
;
5982 #ifdef ASM_OUTPUT_EXTERNAL
5983 pending_assemble_externals_set
= pointer_set_create ();
5988 decl_default_tls_model (const_tree decl
)
5990 enum tls_model kind
;
5993 is_local
= targetm
.binds_local_p (decl
);
5997 kind
= TLS_MODEL_LOCAL_EXEC
;
5999 kind
= TLS_MODEL_INITIAL_EXEC
;
6002 /* Local dynamic is inefficient when we're not combining the
6003 parts of the address. */
6004 else if (optimize
&& is_local
)
6005 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
6007 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
6008 if (kind
< flag_tls_default
)
6009 kind
= flag_tls_default
;
6014 /* Select a set of attributes for section NAME based on the properties
6015 of DECL and whether or not RELOC indicates that DECL's initializer
6016 might contain runtime relocations.
6018 We make the section read-only and executable for a function decl,
6019 read-only for a const data decl, and writable for a non-const data decl. */
6022 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6026 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6027 flags
= SECTION_CODE
;
6030 enum section_category category
6031 = categorize_decl_for_section (decl
, reloc
);
6032 if (decl_readonly_section_1 (category
))
6034 else if (category
== SECCAT_DATA_REL_RO
6035 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6036 flags
= SECTION_WRITE
| SECTION_RELRO
;
6038 flags
= SECTION_WRITE
;
6042 flags
= SECTION_WRITE
;
6043 if (strcmp (name
, ".data.rel.ro") == 0
6044 || strcmp (name
, ".data.rel.ro.local") == 0)
6045 flags
|= SECTION_RELRO
;
6048 if (decl
&& DECL_P (decl
) && DECL_ONE_ONLY (decl
))
6049 flags
|= SECTION_LINKONCE
;
6051 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6052 flags
|= SECTION_TLS
| SECTION_WRITE
;
6054 if (strcmp (name
, ".bss") == 0
6055 || strncmp (name
, ".bss.", 5) == 0
6056 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6057 || strcmp (name
, ".sbss") == 0
6058 || strncmp (name
, ".sbss.", 6) == 0
6059 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6060 flags
|= SECTION_BSS
;
6062 if (strcmp (name
, ".tdata") == 0
6063 || strncmp (name
, ".tdata.", 7) == 0
6064 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6065 flags
|= SECTION_TLS
;
6067 if (strcmp (name
, ".tbss") == 0
6068 || strncmp (name
, ".tbss.", 6) == 0
6069 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6070 flags
|= SECTION_TLS
| SECTION_BSS
;
6072 /* These three sections have special ELF types. They are neither
6073 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6074 want to print a section type (@progbits or @nobits). If someone
6075 is silly enough to emit code or TLS variables to one of these
6076 sections, then don't handle them specially. */
6077 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6078 && (strcmp (name
, ".init_array") == 0
6079 || strcmp (name
, ".fini_array") == 0
6080 || strcmp (name
, ".preinit_array") == 0))
6081 flags
|= SECTION_NOTYPE
;
6086 /* Return true if the target supports some form of global BSS,
6087 either through bss_noswitch_section, or by selecting a BSS
6088 section in TARGET_ASM_SELECT_SECTION. */
6091 have_global_bss_p (void)
6093 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6096 /* Output assembly to switch to section NAME with attribute FLAGS.
6097 Four variants for common object file formats. */
6100 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6101 unsigned int flags ATTRIBUTE_UNUSED
,
6102 tree decl ATTRIBUTE_UNUSED
)
6104 /* Some object formats don't support named sections at all. The
6105 front-end should already have flagged this as an error. */
6109 #ifndef TLS_SECTION_ASM_FLAG
6110 #define TLS_SECTION_ASM_FLAG 'T'
6114 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6115 tree decl ATTRIBUTE_UNUSED
)
6117 char flagchars
[10], *f
= flagchars
;
6119 /* If we have already declared this section, we can use an
6120 abbreviated form to switch back to it -- unless this section is
6121 part of a COMDAT groups, in which case GAS requires the full
6122 declaration every time. */
6123 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6124 && (flags
& SECTION_DECLARED
))
6126 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6130 if (!(flags
& SECTION_DEBUG
))
6132 if (flags
& SECTION_EXCLUDE
)
6134 if (flags
& SECTION_WRITE
)
6136 if (flags
& SECTION_CODE
)
6138 if (flags
& SECTION_SMALL
)
6140 if (flags
& SECTION_MERGE
)
6142 if (flags
& SECTION_STRINGS
)
6144 if (flags
& SECTION_TLS
)
6145 *f
++ = TLS_SECTION_ASM_FLAG
;
6146 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6150 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6152 if (!(flags
& SECTION_NOTYPE
))
6157 if (flags
& SECTION_BSS
)
6163 /* On platforms that use "@" as the assembly comment character,
6165 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6167 fprintf (asm_out_file
, format
, type
);
6169 if (flags
& SECTION_ENTSIZE
)
6170 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6171 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6173 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6174 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6176 fprintf (asm_out_file
, ",%s,comdat",
6177 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6181 putc ('\n', asm_out_file
);
6185 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6186 tree decl ATTRIBUTE_UNUSED
)
6188 char flagchars
[8], *f
= flagchars
;
6190 if (flags
& SECTION_WRITE
)
6192 if (flags
& SECTION_CODE
)
6196 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6200 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6203 default_coff_asm_named_section (name
, flags
, decl
);
6205 if (flags
& SECTION_LINKONCE
)
6207 /* Functions may have been compiled at various levels of
6208 optimization so we can't use `same_size' here.
6209 Instead, have the linker pick one. */
6210 fprintf (asm_out_file
, "\t.linkonce %s\n",
6211 (flags
& SECTION_CODE
? "discard" : "same_size"));
6215 /* The lame default section selector. */
6218 default_select_section (tree decl
, int reloc
,
6219 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6223 if (decl_readonly_section (decl
, reloc
))
6224 return readonly_data_section
;
6226 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6228 if (! ((flag_pic
&& reloc
)
6229 || !TREE_READONLY (decl
)
6230 || TREE_SIDE_EFFECTS (decl
)
6231 || !TREE_CONSTANT (decl
)))
6232 return readonly_data_section
;
6234 else if (TREE_CODE (decl
) == STRING_CST
)
6235 return readonly_data_section
;
6236 else if (! (flag_pic
&& reloc
))
6237 return readonly_data_section
;
6239 return data_section
;
6242 enum section_category
6243 categorize_decl_for_section (const_tree decl
, int reloc
)
6245 enum section_category ret
;
6247 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6249 else if (TREE_CODE (decl
) == STRING_CST
)
6252 || (flag_asan
&& asan_protect_global (CONST_CAST_TREE (decl
))))
6253 /* or !flag_merge_constants */
6254 return SECCAT_RODATA
;
6256 return SECCAT_RODATA_MERGE_STR
;
6258 else if (TREE_CODE (decl
) == VAR_DECL
)
6260 if (bss_initializer_p (decl
))
6262 else if (! TREE_READONLY (decl
)
6263 || TREE_SIDE_EFFECTS (decl
)
6264 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6266 /* Here the reloc_rw_mask is not testing whether the section should
6267 be read-only or not, but whether the dynamic link will have to
6268 do something. If so, we wish to segregate the data in order to
6269 minimize cache misses inside the dynamic linker. */
6270 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6271 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6275 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6276 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6277 else if (reloc
|| flag_merge_constants
< 2 || flag_mudflap
6278 || (flag_asan
&& asan_protect_global (CONST_CAST_TREE (decl
))))
6279 /* C and C++ don't allow different variables to share the same
6280 location. -fmerge-all-constants allows even that (at the
6281 expense of not conforming). */
6282 ret
= SECCAT_RODATA
;
6283 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6284 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6286 ret
= SECCAT_RODATA_MERGE_CONST
;
6288 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6290 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6291 || TREE_SIDE_EFFECTS (decl
)
6292 || ! TREE_CONSTANT (decl
))
6295 ret
= SECCAT_RODATA
;
6298 ret
= SECCAT_RODATA
;
6300 /* There are no read-only thread-local sections. */
6301 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6303 /* Note that this would be *just* SECCAT_BSS, except that there's
6304 no concept of a read-only thread-local-data section. */
6305 if (ret
== SECCAT_BSS
6306 || (flag_zero_initialized_in_bss
6307 && initializer_zerop (DECL_INITIAL (decl
))))
6313 /* If the target uses small data sections, select it. */
6314 else if (targetm
.in_small_data_p (decl
))
6316 if (ret
== SECCAT_BSS
)
6318 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6319 ret
= SECCAT_SRODATA
;
6328 decl_readonly_section_1 (enum section_category category
)
6333 case SECCAT_RODATA_MERGE_STR
:
6334 case SECCAT_RODATA_MERGE_STR_INIT
:
6335 case SECCAT_RODATA_MERGE_CONST
:
6336 case SECCAT_SRODATA
:
6344 decl_readonly_section (const_tree decl
, int reloc
)
6346 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6349 /* Select a section based on the above categorization. */
6352 default_elf_select_section (tree decl
, int reloc
,
6353 unsigned HOST_WIDE_INT align
)
6356 switch (categorize_decl_for_section (decl
, reloc
))
6359 /* We're not supposed to be called on FUNCTION_DECLs. */
6362 return readonly_data_section
;
6363 case SECCAT_RODATA_MERGE_STR
:
6364 return mergeable_string_section (decl
, align
, 0);
6365 case SECCAT_RODATA_MERGE_STR_INIT
:
6366 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6367 case SECCAT_RODATA_MERGE_CONST
:
6368 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6369 case SECCAT_SRODATA
:
6373 return data_section
;
6374 case SECCAT_DATA_REL
:
6375 sname
= ".data.rel";
6377 case SECCAT_DATA_REL_LOCAL
:
6378 sname
= ".data.rel.local";
6380 case SECCAT_DATA_REL_RO
:
6381 sname
= ".data.rel.ro";
6383 case SECCAT_DATA_REL_RO_LOCAL
:
6384 sname
= ".data.rel.ro.local";
6407 return get_named_section (decl
, sname
, reloc
);
6410 /* Construct a unique section name based on the decl name and the
6411 categorization performed above. */
6414 default_unique_section (tree decl
, int reloc
)
6416 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6417 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6418 const char *prefix
, *name
, *linkonce
;
6421 switch (categorize_decl_for_section (decl
, reloc
))
6424 prefix
= one_only
? ".t" : ".text";
6427 case SECCAT_RODATA_MERGE_STR
:
6428 case SECCAT_RODATA_MERGE_STR_INIT
:
6429 case SECCAT_RODATA_MERGE_CONST
:
6430 prefix
= one_only
? ".r" : ".rodata";
6432 case SECCAT_SRODATA
:
6433 prefix
= one_only
? ".s2" : ".sdata2";
6436 prefix
= one_only
? ".d" : ".data";
6438 case SECCAT_DATA_REL
:
6439 prefix
= one_only
? ".d.rel" : ".data.rel";
6441 case SECCAT_DATA_REL_LOCAL
:
6442 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6444 case SECCAT_DATA_REL_RO
:
6445 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6447 case SECCAT_DATA_REL_RO_LOCAL
:
6448 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6451 prefix
= one_only
? ".s" : ".sdata";
6454 prefix
= one_only
? ".b" : ".bss";
6457 prefix
= one_only
? ".sb" : ".sbss";
6460 prefix
= one_only
? ".td" : ".tdata";
6463 prefix
= one_only
? ".tb" : ".tbss";
6469 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
6470 name
= targetm
.strip_name_encoding (name
);
6472 /* If we're using one_only, then there needs to be a .gnu.linkonce
6473 prefix to the section name. */
6474 linkonce
= one_only
? ".gnu.linkonce" : "";
6476 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6478 DECL_SECTION_NAME (decl
) = build_string (strlen (string
), string
);
6481 /* Like compute_reloc_for_constant, except for an RTX. The return value
6482 is a mask for which bit 1 indicates a global relocation, and bit 0
6483 indicates a local relocation. */
6486 compute_reloc_for_rtx_1 (rtx
*xp
, void *data
)
6488 int *preloc
= (int *) data
;
6491 switch (GET_CODE (x
))
6494 *preloc
|= SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6507 compute_reloc_for_rtx (rtx x
)
6511 switch (GET_CODE (x
))
6517 for_each_rtx (&x
, compute_reloc_for_rtx_1
, &reloc
);
6526 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
6528 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6530 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6531 return data_section
;
6533 return readonly_data_section
;
6537 default_elf_select_rtx_section (enum machine_mode mode
, rtx x
,
6538 unsigned HOST_WIDE_INT align
)
6540 int reloc
= compute_reloc_for_rtx (x
);
6542 /* ??? Handle small data here somehow. */
6544 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6547 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6549 return get_named_section (NULL
, ".data.rel.ro", 3);
6552 return mergeable_constant_section (mode
, align
, 0);
6555 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6558 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6563 /* Careful not to prod global register variables. */
6566 symbol
= XEXP (rtl
, 0);
6567 if (GET_CODE (symbol
) != SYMBOL_REF
)
6570 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6571 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6572 flags
|= SYMBOL_FLAG_FUNCTION
;
6573 if (targetm
.binds_local_p (decl
))
6574 flags
|= SYMBOL_FLAG_LOCAL
;
6575 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6576 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6577 else if (targetm
.in_small_data_p (decl
))
6578 flags
|= SYMBOL_FLAG_SMALL
;
6579 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6580 being PUBLIC, the thing *must* be defined in this translation unit.
6581 Prevent this buglet from being propagated into rtl code as well. */
6582 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6583 flags
|= SYMBOL_FLAG_EXTERNAL
;
6585 SYMBOL_REF_FLAGS (symbol
) = flags
;
6588 /* By default, we do nothing for encode_section_info, so we need not
6589 do anything but discard the '*' marker. */
6592 default_strip_name_encoding (const char *str
)
6594 return str
+ (*str
== '*');
6597 #ifdef ASM_OUTPUT_DEF
6598 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6599 anchor relative to ".", the current section position. */
6602 default_asm_output_anchor (rtx symbol
)
6606 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6607 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6608 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6612 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6615 default_use_anchors_for_symbol_p (const_rtx symbol
)
6620 /* Don't use anchors for mergeable sections. The linker might move
6621 the objects around. */
6622 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6623 if (sect
->common
.flags
& SECTION_MERGE
)
6626 /* Don't use anchors for small data sections. The small data register
6627 acts as an anchor for such sections. */
6628 if (sect
->common
.flags
& SECTION_SMALL
)
6631 decl
= SYMBOL_REF_DECL (symbol
);
6632 if (decl
&& DECL_P (decl
))
6634 /* Don't use section anchors for decls that might be defined or
6635 usurped by other modules. */
6636 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
6639 /* Don't use section anchors for decls that will be placed in a
6640 small data section. */
6641 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6642 one above. The problem is that we only use SECTION_SMALL for
6643 sections that should be marked as small in the section directive. */
6644 if (targetm
.in_small_data_p (decl
))
6650 /* Return true when RESOLUTION indicate that symbol will be bound to the
6651 definition provided by current .o file. */
6654 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6656 return (resolution
== LDPR_PREVAILING_DEF
6657 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6658 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6661 /* Return true when RESOLUTION indicate that symbol will be bound locally
6662 within current executable or DSO. */
6665 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6667 return (resolution
== LDPR_PREVAILING_DEF
6668 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6669 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6670 || resolution
== LDPR_PREEMPTED_REG
6671 || resolution
== LDPR_PREEMPTED_IR
6672 || resolution
== LDPR_RESOLVED_IR
6673 || resolution
== LDPR_RESOLVED_EXEC
);
6676 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6677 wrt cross-module name binding. */
6680 default_binds_local_p (const_tree exp
)
6682 return default_binds_local_p_1 (exp
, flag_shlib
);
6686 default_binds_local_p_1 (const_tree exp
, int shlib
)
6689 bool resolved_locally
= false;
6690 bool resolved_to_local_def
= false;
6692 /* With resolution file in hands, take look into resolutions.
6693 We can't just return true for resolved_locally symbols,
6694 because dynamic linking might overwrite symbols
6695 in shared libraries. */
6696 if (TREE_CODE (exp
) == VAR_DECL
&& TREE_PUBLIC (exp
)
6697 && (TREE_STATIC (exp
) || DECL_EXTERNAL (exp
)))
6699 struct varpool_node
*vnode
= varpool_get_node (exp
);
6700 if (vnode
&& resolution_local_p (vnode
->symbol
.resolution
))
6701 resolved_locally
= true;
6703 && resolution_to_local_definition_p (vnode
->symbol
.resolution
))
6704 resolved_to_local_def
= true;
6706 else if (TREE_CODE (exp
) == FUNCTION_DECL
&& TREE_PUBLIC (exp
))
6708 struct cgraph_node
*node
= cgraph_get_node (exp
);
6710 && resolution_local_p (node
->symbol
.resolution
))
6711 resolved_locally
= true;
6713 && resolution_to_local_definition_p (node
->symbol
.resolution
))
6714 resolved_to_local_def
= true;
6717 /* A non-decl is an entry in the constant pool. */
6720 /* Weakrefs may not bind locally, even though the weakref itself is always
6721 static and therefore local. Similarly, the resolver for ifunc functions
6722 might resolve to a non-local function.
6723 FIXME: We can resolve the weakref case more curefuly by looking at the
6725 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6726 || (TREE_CODE (exp
) == FUNCTION_DECL
6727 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6729 /* Static variables are always local. */
6730 else if (! TREE_PUBLIC (exp
))
6732 /* A variable is local if the user has said explicitly that it will
6734 else if ((DECL_VISIBILITY_SPECIFIED (exp
)
6735 || resolved_to_local_def
)
6736 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6738 /* Variables defined outside this object might not be local. */
6739 else if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6741 /* If defined in this object and visibility is not default, must be
6743 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6745 /* Default visibility weak data can be overridden by a strong symbol
6746 in another module and so are not local. */
6747 else if (DECL_WEAK (exp
)
6748 && !resolved_locally
)
6750 /* If PIC, then assume that any global name can be overridden by
6751 symbols resolved from other modules. */
6754 /* Uninitialized COMMON variable may be unified with symbols
6755 resolved from other modules. */
6756 else if (DECL_COMMON (exp
)
6757 && !resolved_locally
6758 && (DECL_INITIAL (exp
) == NULL
6759 || DECL_INITIAL (exp
) == error_mark_node
))
6761 /* Otherwise we're left with initialized (or non-common) global data
6762 which is of necessity defined locally. */
6769 /* Return true when references to DECL must bind to current definition in
6772 The condition is usually equivalent to whether the function binds to the
6773 current module (shared library or executable), that is to binds_local_p.
6774 We use this fact to avoid need for another target hook and implement
6775 the logic using binds_local_p and just special cases where
6776 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6777 the weak definitions (that can be overwritten at linktime by other
6778 definition from different object file) and when resolution info is available
6779 we simply use the knowledge passed to us by linker plugin. */
6781 decl_binds_to_current_def_p (tree decl
)
6783 gcc_assert (DECL_P (decl
));
6784 if (!TREE_PUBLIC (decl
))
6786 if (!targetm
.binds_local_p (decl
))
6788 /* When resolution is available, just use it. */
6789 if (TREE_CODE (decl
) == VAR_DECL
6790 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)))
6792 struct varpool_node
*vnode
= varpool_get_node (decl
);
6794 && vnode
->symbol
.resolution
!= LDPR_UNKNOWN
)
6795 return resolution_to_local_definition_p (vnode
->symbol
.resolution
);
6797 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
6799 struct cgraph_node
*node
= cgraph_get_node (decl
);
6801 && node
->symbol
.resolution
!= LDPR_UNKNOWN
)
6802 return resolution_to_local_definition_p (node
->symbol
.resolution
);
6804 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6805 binds locally but still can be overwritten).
6806 This rely on fact that binds_local_p behave as decl_replaceable_p
6807 for all other declaration types. */
6808 return !DECL_WEAK (decl
);
6811 /* A replaceable function or variable is one which may be replaced
6812 at link-time with an entirely different definition, provided that the
6813 replacement has the same type. For example, functions declared
6814 with __attribute__((weak)) on most systems are replaceable.
6816 COMDAT functions are not replaceable, since all definitions of the
6817 function must be equivalent. It is important that COMDAT functions
6818 not be treated as replaceable so that use of C++ template
6819 instantiations is not penalized. */
6822 decl_replaceable_p (tree decl
)
6824 gcc_assert (DECL_P (decl
));
6825 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
6827 return !decl_binds_to_current_def_p (decl
);
6830 /* Default function to output code that will globalize a label. A
6831 target must define GLOBAL_ASM_OP or provide its own function to
6832 globalize a label. */
6833 #ifdef GLOBAL_ASM_OP
6835 default_globalize_label (FILE * stream
, const char *name
)
6837 fputs (GLOBAL_ASM_OP
, stream
);
6838 assemble_name (stream
, name
);
6839 putc ('\n', stream
);
6841 #endif /* GLOBAL_ASM_OP */
6843 /* Default function to output code that will globalize a declaration. */
6845 default_globalize_decl_name (FILE * stream
, tree decl
)
6847 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6848 targetm
.asm_out
.globalize_label (stream
, name
);
6851 /* Default function to output a label for unwind information. The
6852 default is to do nothing. A target that needs nonlocal labels for
6853 unwind information must provide its own function to do this. */
6855 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6856 tree decl ATTRIBUTE_UNUSED
,
6857 int for_eh ATTRIBUTE_UNUSED
,
6858 int empty ATTRIBUTE_UNUSED
)
6862 /* Default function to output a label to divide up the exception table.
6863 The default is to do nothing. A target that needs/wants to divide
6864 up the table must provide it's own function to do this. */
6866 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
6870 /* This is how to output an internal numbered label where PREFIX is
6871 the class of label and LABELNO is the number within the class. */
6874 default_generate_internal_label (char *buf
, const char *prefix
,
6875 unsigned long labelno
)
6877 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6880 /* This is how to output an internal numbered label where PREFIX is
6881 the class of label and LABELNO is the number within the class. */
6884 default_internal_label (FILE *stream
, const char *prefix
,
6885 unsigned long labelno
)
6887 char *const buf
= (char *) alloca (40 + strlen (prefix
));
6888 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6889 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
6893 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
6896 default_asm_declare_constant_name (FILE *file
, const char *name
,
6897 const_tree exp ATTRIBUTE_UNUSED
,
6898 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
6900 assemble_label (file
, name
);
6903 /* This is the default behavior at the beginning of a file. It's
6904 controlled by two other target-hook toggles. */
6906 default_file_start (void)
6908 if (targetm
.asm_file_start_app_off
6909 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
6910 fputs (ASM_APP_OFF
, asm_out_file
);
6912 if (targetm
.asm_file_start_file_directive
)
6913 output_file_directive (asm_out_file
, main_input_filename
);
6916 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6917 which emits a special section directive used to indicate whether or
6918 not this object file needs an executable stack. This is primarily
6919 a GNU extension to ELF but could be used on other targets. */
6921 int trampolines_created
;
6924 file_end_indicate_exec_stack (void)
6926 unsigned int flags
= SECTION_DEBUG
;
6927 if (trampolines_created
)
6928 flags
|= SECTION_CODE
;
6930 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
6933 /* Emit a special section directive to indicate that this object file
6934 was compiled with -fsplit-stack. This is used to let the linker
6935 detect calls between split-stack code and non-split-stack code, so
6936 that it can modify the split-stack code to allocate a sufficiently
6937 large stack. We emit another special section if there are any
6938 functions in this file which have the no_split_stack attribute, to
6939 prevent the linker from warning about being unable to convert the
6940 functions if they call non-split-stack code. */
6943 file_end_indicate_split_stack (void)
6945 if (flag_split_stack
)
6947 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
6949 if (saw_no_split_stack
)
6950 switch_to_section (get_section (".note.GNU-no-split-stack",
6951 SECTION_DEBUG
, NULL
));
6955 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6956 a get_unnamed_section callback. */
6959 output_section_asm_op (const void *directive
)
6961 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
6964 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6965 the current section is NEW_SECTION. */
6968 switch_to_section (section
*new_section
)
6970 if (in_section
== new_section
)
6973 if (new_section
->common
.flags
& SECTION_FORGET
)
6976 in_section
= new_section
;
6978 switch (SECTION_STYLE (new_section
))
6981 targetm
.asm_out
.named_section (new_section
->named
.name
,
6982 new_section
->named
.common
.flags
,
6983 new_section
->named
.decl
);
6986 case SECTION_UNNAMED
:
6987 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
6990 case SECTION_NOSWITCH
:
6995 new_section
->common
.flags
|= SECTION_DECLARED
;
6998 /* If block symbol SYMBOL has not yet been assigned an offset, place
6999 it at the end of its block. */
7002 place_block_symbol (rtx symbol
)
7004 unsigned HOST_WIDE_INT size
, mask
, offset
;
7005 struct constant_descriptor_rtx
*desc
;
7006 unsigned int alignment
;
7007 struct object_block
*block
;
7010 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7011 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7014 /* Work out the symbol's size and alignment. */
7015 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7017 desc
= SYMBOL_REF_CONSTANT (symbol
);
7018 alignment
= desc
->align
;
7019 size
= GET_MODE_SIZE (desc
->mode
);
7021 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7023 decl
= SYMBOL_REF_DECL (symbol
);
7024 alignment
= DECL_ALIGN (decl
);
7025 size
= get_constant_size (DECL_INITIAL (decl
));
7027 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7028 && asan_protect_global (DECL_INITIAL (decl
)))
7029 size
+= asan_red_zone_size (size
);
7033 decl
= SYMBOL_REF_DECL (symbol
);
7034 alignment
= get_variable_align (decl
);
7035 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
7036 if (flag_asan
&& asan_protect_global (decl
))
7038 size
+= asan_red_zone_size (size
);
7039 alignment
= MAX (alignment
,
7040 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7044 /* Calculate the object's offset from the start of the block. */
7045 block
= SYMBOL_REF_BLOCK (symbol
);
7046 mask
= alignment
/ BITS_PER_UNIT
- 1;
7047 offset
= (block
->size
+ mask
) & ~mask
;
7048 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7050 /* Record the block's new alignment and size. */
7051 block
->alignment
= MAX (block
->alignment
, alignment
);
7052 block
->size
= offset
+ size
;
7054 vec_safe_push (block
->objects
, symbol
);
7057 /* Return the anchor that should be used to address byte offset OFFSET
7058 from the first object in BLOCK. MODEL is the TLS model used
7062 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7063 enum tls_model model
)
7066 unsigned int begin
, middle
, end
;
7067 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7070 /* Work out the anchor's offset. Use an offset of 0 for the first
7071 anchor so that we don't pessimize the case where we take the address
7072 of a variable at the beginning of the block. This is particularly
7073 useful when a block has only one variable assigned to it.
7075 We try to place anchors RANGE bytes apart, so there can then be
7076 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7077 a ptr_mode offset. With some target settings, the lowest such
7078 anchor might be out of range for the lowest ptr_mode offset;
7079 likewise the highest anchor for the highest offset. Use anchors
7080 at the extreme ends of the ptr_mode range in such cases.
7082 All arithmetic uses unsigned integers in order to avoid
7084 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7085 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7086 range
= max_offset
- min_offset
+ 1;
7091 bias
= 1 << (GET_MODE_BITSIZE (ptr_mode
) - 1);
7094 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7095 delta
-= delta
% range
;
7098 offset
= (HOST_WIDE_INT
) (-delta
);
7102 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7103 delta
-= delta
% range
;
7104 if (delta
> bias
- 1)
7106 offset
= (HOST_WIDE_INT
) delta
;
7110 /* Do a binary search to see if there's already an anchor we can use.
7111 Set BEGIN to the new anchor's index if not. */
7113 end
= vec_safe_length (block
->anchors
);
7114 while (begin
!= end
)
7116 middle
= (end
+ begin
) / 2;
7117 anchor
= (*block
->anchors
)[middle
];
7118 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7120 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7122 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7124 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7130 /* Create a new anchor with a unique label. */
7131 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7132 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7133 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7134 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7136 /* Insert it at index BEGIN. */
7137 vec_safe_insert (block
->anchors
, begin
, anchor
);
7141 /* Output the objects in BLOCK. */
7144 output_object_block (struct object_block
*block
)
7146 struct constant_descriptor_rtx
*desc
;
7148 HOST_WIDE_INT offset
;
7152 if (!block
->objects
)
7155 /* Switch to the section and make sure that the first byte is
7156 suitably aligned. */
7157 switch_to_section (block
->sect
);
7158 assemble_align (block
->alignment
);
7160 /* Define the values of all anchors relative to the current section
7162 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7163 targetm
.asm_out
.output_anchor (symbol
);
7165 /* Output the objects themselves. */
7167 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7169 /* Move to the object's offset, padding with zeros if necessary. */
7170 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7171 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7172 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7174 desc
= SYMBOL_REF_CONSTANT (symbol
);
7175 output_constant_pool_1 (desc
, 1);
7176 offset
+= GET_MODE_SIZE (desc
->mode
);
7178 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7181 decl
= SYMBOL_REF_DECL (symbol
);
7182 assemble_constant_contents (DECL_INITIAL (decl
), XSTR (symbol
, 0),
7184 size
= get_constant_size (DECL_INITIAL (decl
));
7187 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7188 && asan_protect_global (DECL_INITIAL (decl
)))
7190 size
= asan_red_zone_size (size
);
7191 assemble_zeros (size
);
7198 decl
= SYMBOL_REF_DECL (symbol
);
7199 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7200 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
7202 if (flag_asan
&& asan_protect_global (decl
))
7204 size
= asan_red_zone_size (size
);
7205 assemble_zeros (size
);
7212 /* A htab_traverse callback used to call output_object_block for
7213 each member of object_block_htab. */
7216 output_object_block_htab (void **slot
, void *data ATTRIBUTE_UNUSED
)
7218 output_object_block ((struct object_block
*) (*slot
));
7222 /* Output the definitions of all object_blocks. */
7225 output_object_blocks (void)
7227 htab_traverse (object_block_htab
, output_object_block_htab
, NULL
);
7230 /* This function provides a possible implementation of the
7231 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7232 by -frecord-gcc-switches it creates a new mergeable, string section in the
7233 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7234 contains the switches in ASCII format.
7236 FIXME: This code does not correctly handle double quote characters
7237 that appear inside strings, (it strips them rather than preserving them).
7238 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7239 characters - instead it treats them as sub-string separators. Since
7240 we want to emit NUL strings terminators into the object file we have to use
7244 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7248 case SWITCH_TYPE_PASSED
:
7249 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7250 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7253 case SWITCH_TYPE_DESCRIPTIVE
:
7256 /* Distinguish between invocations where name is NULL. */
7257 static bool started
= false;
7263 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7267 | (SECTION_ENTSIZE
& 1),
7269 switch_to_section (sec
);
7278 /* The return value is currently ignored by the caller, but must be 0.
7279 For -fverbose-asm the return value would be the number of characters
7280 emitted into the assembler file. */
7284 /* Emit text to declare externally defined symbols. It is needed to
7285 properly support non-default visibility. */
7287 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7289 const char *name ATTRIBUTE_UNUSED
)
7291 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7292 set in order to avoid putting out names that are never really
7294 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7295 && targetm
.binds_local_p (decl
))
7296 maybe_assemble_visibility (decl
);
7299 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7302 default_asm_output_source_filename (FILE *file
, const char *name
)
7304 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7305 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7307 fprintf (file
, "\t.file\t");
7308 output_quoted_string (file
, name
);
7313 /* Output a file name in the form wanted by System V. */
7316 output_file_directive (FILE *asm_file
, const char *input_name
)
7321 if (input_name
== NULL
)
7322 input_name
= "<stdin>";
7324 input_name
= remap_debug_filename (input_name
);
7326 len
= strlen (input_name
);
7327 na
= input_name
+ len
;
7329 /* NA gets INPUT_NAME sans directory names. */
7330 while (na
> input_name
)
7332 if (IS_DIR_SEPARATOR (na
[-1]))
7337 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7340 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7343 make_debug_expr_from_rtl (const_rtx exp
)
7345 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7346 enum machine_mode mode
= GET_MODE (exp
);
7349 DECL_ARTIFICIAL (ddecl
) = 1;
7350 if (REG_P (exp
) && REG_EXPR (exp
))
7351 type
= TREE_TYPE (REG_EXPR (exp
));
7352 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7353 type
= TREE_TYPE (MEM_EXPR (exp
));
7356 if (type
&& TYPE_MODE (type
) == mode
)
7357 TREE_TYPE (ddecl
) = type
;
7359 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7360 DECL_MODE (ddecl
) = mode
;
7361 dval
= gen_rtx_DEBUG_EXPR (mode
);
7362 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7363 SET_DECL_RTL (ddecl
, dval
);
7367 #ifdef ELF_ASCII_ESCAPES
7368 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7371 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7376 fputs (STRING_ASM_OP
, f
);
7381 escape
= ELF_ASCII_ESCAPES
[c
];
7388 /* TODO: Print in hex with fast function, important for -flto. */
7389 fprintf (f
, "\\%03o", c
);
7402 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7405 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7407 const char *limit
= s
+ len
;
7408 const char *last_null
= NULL
;
7409 unsigned bytes_in_chunk
= 0;
7413 for (; s
< limit
; s
++)
7417 if (bytes_in_chunk
>= 60)
7426 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7433 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7435 if (bytes_in_chunk
> 0)
7442 default_elf_asm_output_limited_string (f
, s
);
7447 if (bytes_in_chunk
== 0)
7448 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7451 escape
= ELF_ASCII_ESCAPES
[c
];
7459 /* TODO: Print in hex with fast function, important for -flto. */
7460 fprintf (f
, "\\%03o", c
);
7461 bytes_in_chunk
+= 4;
7466 bytes_in_chunk
+= 2;
7473 if (bytes_in_chunk
> 0)
7481 static GTY(()) section
*elf_init_array_section
;
7482 static GTY(()) section
*elf_fini_array_section
;
7485 get_elf_initfini_array_priority_section (int priority
,
7489 if (priority
!= DEFAULT_INIT_PRIORITY
)
7492 sprintf (buf
, "%s.%.5u",
7493 constructor_p
? ".init_array" : ".fini_array",
7495 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7501 if (elf_init_array_section
== NULL
)
7502 elf_init_array_section
7503 = get_section (".init_array",
7504 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7505 sec
= elf_init_array_section
;
7509 if (elf_fini_array_section
== NULL
)
7510 elf_fini_array_section
7511 = get_section (".fini_array",
7512 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7513 sec
= elf_fini_array_section
;
7519 /* Use .init_array section for constructors. */
7522 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7524 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7526 assemble_addr_to_section (symbol
, sec
);
7529 /* Use .fini_array section for destructors. */
7532 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7534 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7536 assemble_addr_to_section (symbol
, sec
);
7539 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7541 This is a bit of a cheat. The real default is a no-op, but this
7542 hook is the default for all targets with a .ident directive. */
7545 default_asm_output_ident_directive (const char *ident_str
)
7547 const char *ident_asm_op
= "\t.ident\t";
7549 /* If we are still in the front end, do not write out the string
7550 to asm_out_file. Instead, add a fake top-level asm statement.
7551 This allows the front ends to use this hook without actually
7552 writing to asm_out_file, to handle #ident or Pragma Ident. */
7553 if (cgraph_state
== CGRAPH_STATE_PARSING
)
7555 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7556 add_asm_node (build_string (strlen (buf
), buf
));
7559 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7562 #include "gt-varasm.h"