1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987-2013 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
21 /* This file handles generation of all the assembler code
22 *except* the instructions of a function.
23 This includes declarations of variables and their initial values.
25 We also output the assembler code for constants stored in memory
26 and are responsible for combining constants with the same value. */
30 #include "coretypes.h"
37 #include "hard-reg-set.h"
40 #include "diagnostic-core.h"
43 #include "langhooks.h"
47 #include "common/common-target.h"
48 #include "targhooks.h"
49 #include "tree-mudflap.h"
51 #include "pointer-set.h"
54 #ifdef XCOFF_DEBUGGING_INFO
55 #include "xcoffout.h" /* Needed for external data
56 declarations for e.g. AIX 4.x. */
59 /* The (assembler) name of the first globally-visible object output. */
60 extern GTY(()) const char *first_global_object_name
;
61 extern GTY(()) const char *weak_global_object_name
;
63 const char *first_global_object_name
;
64 const char *weak_global_object_name
;
67 struct constant_descriptor_rtx
;
68 struct rtx_constant_pool
;
70 #define n_deferred_constants (crtl->varasm.deferred_constants)
72 /* Number for making the label on the next
73 constant that is stored in memory. */
75 static GTY(()) int const_labelno
;
77 /* Carry information from ASM_DECLARE_OBJECT_NAME
78 to ASM_FINISH_DECLARE_OBJECT. */
80 int size_directive_output
;
82 /* The last decl for which assemble_variable was called,
83 if it did ASM_DECLARE_OBJECT_NAME.
84 If the last call to assemble_variable didn't do that,
87 tree last_assemble_variable_decl
;
89 /* The following global variable indicates if the first basic block
90 in a function belongs to the cold partition or not. */
92 bool first_function_block_is_cold
;
94 /* We give all constants their own alias set. Perhaps redundant with
95 MEM_READONLY_P, but pre-dates it. */
97 static alias_set_type const_alias_set
;
99 /* Whether we saw any functions with no_split_stack. */
101 static bool saw_no_split_stack
;
103 static const char *strip_reg_name (const char *);
104 static int contains_pointers_p (tree
);
105 #ifdef ASM_OUTPUT_EXTERNAL
106 static bool incorporeal_function_p (tree
);
108 static void decode_addr_const (tree
, struct addr_const
*);
109 static hashval_t
const_desc_hash (const void *);
110 static int const_desc_eq (const void *, const void *);
111 static hashval_t
const_hash_1 (const tree
);
112 static int compare_constant (const tree
, const tree
);
113 static tree
copy_constant (tree
);
114 static void output_constant_def_contents (rtx
);
115 static void output_addressed_constants (tree
);
116 static unsigned HOST_WIDE_INT
array_size_for_constructor (tree
);
117 static unsigned min_align (unsigned, unsigned);
118 static void globalize_decl (tree
);
119 static bool decl_readonly_section_1 (enum section_category
);
120 #ifdef BSS_SECTION_ASM_OP
121 #ifdef ASM_OUTPUT_ALIGNED_BSS
122 static void asm_output_aligned_bss (FILE *, tree
, const char *,
123 unsigned HOST_WIDE_INT
, int)
126 #endif /* BSS_SECTION_ASM_OP */
127 static void mark_weak (tree
);
128 static void output_constant_pool (const char *, tree
);
130 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
131 section
*text_section
;
132 section
*data_section
;
133 section
*readonly_data_section
;
134 section
*sdata_section
;
135 section
*ctors_section
;
136 section
*dtors_section
;
137 section
*bss_section
;
138 section
*sbss_section
;
140 /* Various forms of common section. All are guaranteed to be nonnull. */
141 section
*tls_comm_section
;
142 section
*comm_section
;
143 section
*lcomm_section
;
145 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
147 section
*bss_noswitch_section
;
149 /* The section that holds the main exception table, when known. The section
150 is set either by the target's init_sections hook or by the first call to
151 switch_to_exception_section. */
152 section
*exception_section
;
154 /* The section that holds the DWARF2 frame unwind information, when known.
155 The section is set either by the target's init_sections hook or by the
156 first call to switch_to_eh_frame_section. */
157 section
*eh_frame_section
;
159 /* asm_out_file's current section. This is NULL if no section has yet
160 been selected or if we lose track of what the current section is. */
163 /* True if code for the current function is currently being directed
164 at the cold section. */
165 bool in_cold_section_p
;
167 /* A linked list of all the unnamed sections. */
168 static GTY(()) section
*unnamed_sections
;
170 /* Return a nonzero value if DECL has a section attribute. */
171 #define IN_NAMED_SECTION(DECL) \
172 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
173 && DECL_SECTION_NAME (DECL) != NULL_TREE)
175 /* Hash table of named sections. */
176 static GTY((param_is (section
))) htab_t section_htab
;
178 /* A table of object_blocks, indexed by section. */
179 static GTY((param_is (struct object_block
))) htab_t object_block_htab
;
181 /* The next number to use for internal anchor labels. */
182 static GTY(()) int anchor_labelno
;
184 /* A pool of constants that can be shared between functions. */
185 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
187 /* Helper routines for maintaining section_htab. */
190 section_entry_eq (const void *p1
, const void *p2
)
192 const section
*old
= (const section
*) p1
;
193 const char *new_name
= (const char *) p2
;
195 return strcmp (old
->named
.name
, new_name
) == 0;
199 section_entry_hash (const void *p
)
201 const section
*old
= (const section
*) p
;
202 return htab_hash_string (old
->named
.name
);
205 /* Return a hash value for section SECT. */
208 hash_section (section
*sect
)
210 if (sect
->common
.flags
& SECTION_NAMED
)
211 return htab_hash_string (sect
->named
.name
);
212 return sect
->common
.flags
;
215 /* Helper routines for maintaining object_block_htab. */
218 object_block_entry_eq (const void *p1
, const void *p2
)
220 const struct object_block
*old
= (const struct object_block
*) p1
;
221 const section
*new_section
= (const section
*) p2
;
223 return old
->sect
== new_section
;
227 object_block_entry_hash (const void *p
)
229 const struct object_block
*old
= (const struct object_block
*) p
;
230 return hash_section (old
->sect
);
233 /* Return a new unnamed section with the given fields. */
236 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
241 sect
= ggc_alloc_section ();
242 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
243 sect
->unnamed
.callback
= callback
;
244 sect
->unnamed
.data
= data
;
245 sect
->unnamed
.next
= unnamed_sections
;
247 unnamed_sections
= sect
;
251 /* Return a SECTION_NOSWITCH section with the given fields. */
254 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
258 sect
= ggc_alloc_section ();
259 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
260 sect
->noswitch
.callback
= callback
;
265 /* Return the named section structure associated with NAME. Create
266 a new section with the given fields if no such structure exists. */
269 get_section (const char *name
, unsigned int flags
, tree decl
)
271 section
*sect
, **slot
;
274 htab_find_slot_with_hash (section_htab
, name
,
275 htab_hash_string (name
), INSERT
);
276 flags
|= SECTION_NAMED
;
279 sect
= ggc_alloc_section ();
280 sect
->named
.common
.flags
= flags
;
281 sect
->named
.name
= ggc_strdup (name
);
282 sect
->named
.decl
= decl
;
288 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
289 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
291 /* It is fine if one of the section flags is
292 SECTION_WRITE | SECTION_RELRO and the other has none of these
293 flags (i.e. read-only) in named sections and either the
294 section hasn't been declared yet or has been declared as writable.
295 In that case just make sure the resulting flags are
296 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
298 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
299 == (SECTION_WRITE
| SECTION_RELRO
)
300 && (sect
->common
.flags
301 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
302 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
303 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
304 || (sect
->common
.flags
& SECTION_WRITE
)))
306 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
309 /* Sanity check user variables for flag changes. */
311 decl
= sect
->named
.decl
;
313 if (sect
->named
.decl
== NULL
)
314 error ("%+D causes a section type conflict", decl
);
317 error ("%+D causes a section type conflict with %D",
318 decl
, sect
->named
.decl
);
319 if (decl
!= sect
->named
.decl
)
320 inform (DECL_SOURCE_LOCATION (sect
->named
.decl
),
321 "%qD was declared here", sect
->named
.decl
);
323 /* Make sure we don't error about one section multiple times. */
324 sect
->common
.flags
|= SECTION_OVERRIDE
;
330 /* Return true if the current compilation mode benefits from having
331 objects grouped into blocks. */
334 use_object_blocks_p (void)
336 return flag_section_anchors
;
339 /* Return the object_block structure for section SECT. Create a new
340 structure if we haven't created one already. Return null if SECT
343 static struct object_block
*
344 get_block_for_section (section
*sect
)
346 struct object_block
*block
;
352 slot
= htab_find_slot_with_hash (object_block_htab
, sect
,
353 hash_section (sect
), INSERT
);
354 block
= (struct object_block
*) *slot
;
357 block
= ggc_alloc_cleared_object_block ();
364 /* Create a symbol with label LABEL and place it at byte offset
365 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
366 is not yet known. LABEL must be a garbage-collected string. */
369 create_block_symbol (const char *label
, struct object_block
*block
,
370 HOST_WIDE_INT offset
)
375 /* Create the extended SYMBOL_REF. */
376 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
377 symbol
= ggc_alloc_rtx_def (size
);
379 /* Initialize the normal SYMBOL_REF fields. */
380 memset (symbol
, 0, size
);
381 PUT_CODE (symbol
, SYMBOL_REF
);
382 PUT_MODE (symbol
, Pmode
);
383 XSTR (symbol
, 0) = label
;
384 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
386 /* Initialize the block_symbol stuff. */
387 SYMBOL_REF_BLOCK (symbol
) = block
;
388 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
393 /* Return a section with a particular name and with whatever SECTION_*
394 flags section_type_flags deems appropriate. The name of the section
395 is taken from NAME if nonnull, otherwise it is taken from DECL's
396 DECL_SECTION_NAME. DECL is the decl associated with the section
397 (see the section comment for details) and RELOC is as for
398 section_type_flags. */
401 get_named_section (tree decl
, const char *name
, int reloc
)
407 gcc_assert (decl
&& DECL_P (decl
) && DECL_SECTION_NAME (decl
));
408 name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
411 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
413 if (decl
&& !DECL_P (decl
))
415 return get_section (name
, flags
, decl
);
418 /* If required, set DECL_SECTION_NAME to a unique name. */
421 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
422 int flag_function_or_data_sections
)
424 if (DECL_SECTION_NAME (decl
) == NULL_TREE
425 && targetm_common
.have_named_sections
426 && (flag_function_or_data_sections
427 || DECL_ONE_ONLY (decl
)))
429 targetm
.asm_out
.unique_section (decl
, reloc
);
430 DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
) = true;
434 #ifdef BSS_SECTION_ASM_OP
436 #ifdef ASM_OUTPUT_ALIGNED_BSS
438 /* Utility function for targets to use in implementing
439 ASM_OUTPUT_ALIGNED_BSS.
440 ??? It is believed that this function will work in most cases so such
441 support is localized here. */
444 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
445 const char *name
, unsigned HOST_WIDE_INT size
,
448 switch_to_section (bss_section
);
449 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
450 #ifdef ASM_DECLARE_OBJECT_NAME
451 last_assemble_variable_decl
= decl
;
452 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
454 /* Standard thing is just output label for the object. */
455 ASM_OUTPUT_LABEL (file
, name
);
456 #endif /* ASM_DECLARE_OBJECT_NAME */
457 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
462 #endif /* BSS_SECTION_ASM_OP */
464 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
465 /* Return the hot section for function DECL. Return text_section for
469 hot_function_section (tree decl
)
471 if (decl
!= NULL_TREE
472 && DECL_SECTION_NAME (decl
) != NULL_TREE
473 && targetm_common
.have_named_sections
)
474 return get_named_section (decl
, NULL
, 0);
480 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
483 When DECL_SECTION_NAME is non-NULL and it is implicit section and
484 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
485 concatenate the name with NAMED_SECTION_SUFFIX.
486 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
489 get_named_text_section (tree decl
,
490 const char *text_section_name
,
491 const char *named_section_suffix
)
493 if (decl
&& DECL_SECTION_NAME (decl
))
495 if (named_section_suffix
)
497 tree dsn
= DECL_SECTION_NAME (decl
);
498 const char *stripped_name
;
501 name
= (char *) alloca (TREE_STRING_LENGTH (dsn
) + 1);
502 memcpy (name
, TREE_STRING_POINTER (dsn
),
503 TREE_STRING_LENGTH (dsn
) + 1);
505 stripped_name
= targetm
.strip_name_encoding (name
);
507 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
508 return get_named_section (decl
, buffer
, 0);
510 else if (DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
))
514 /* Do not try to split gnu_linkonce functions. This gets somewhat
516 if (DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
)
518 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
519 name
= targetm
.strip_name_encoding (name
);
520 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
526 return get_named_section (decl
, text_section_name
, 0);
529 /* Choose named function section based on its frequency. */
532 default_function_section (tree decl
, enum node_frequency freq
,
533 bool startup
, bool exit
)
535 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
536 /* Old GNU linkers have buggy --gc-section support, which sometimes
537 results in .gcc_except_table* sections being garbage collected. */
539 && DECL_SECTION_NAME (decl
)
540 && DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
))
544 if (!flag_reorder_functions
545 || !targetm_common
.have_named_sections
)
547 /* Startup code should go to startup subsection unless it is
548 unlikely executed (this happens especially with function splitting
549 where we can split away unnecessary parts of static constructors. */
550 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
551 return get_named_text_section (decl
, ".text.startup", NULL
);
553 /* Similarly for exit. */
554 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
555 return get_named_text_section (decl
, ".text.exit", NULL
);
557 /* Group cold functions together, similarly for hot code. */
560 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
561 return get_named_text_section (decl
, ".text.unlikely", NULL
);
562 case NODE_FREQUENCY_HOT
:
563 return get_named_text_section (decl
, ".text.hot", NULL
);
569 /* Return the section for function DECL.
571 If DECL is NULL_TREE, return the text section. We can be passed
572 NULL_TREE under some circumstances by dbxout.c at least.
574 If FORCE_COLD is true, return cold function section ignoring
575 the frequency info of cgraph_node. */
578 function_section_1 (tree decl
, bool force_cold
)
580 section
*section
= NULL
;
581 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
582 bool startup
= false, exit
= false;
586 struct cgraph_node
*node
= cgraph_get_node (decl
);
590 freq
= node
->frequency
;
591 startup
= node
->only_called_at_startup
;
592 exit
= node
->only_called_at_exit
;
596 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
598 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
599 if (decl
!= NULL_TREE
600 && DECL_SECTION_NAME (decl
) != NULL_TREE
)
602 if (targetm
.asm_out
.function_section
)
603 section
= targetm
.asm_out
.function_section (decl
, freq
,
607 return get_named_section (decl
, NULL
, 0);
610 return targetm
.asm_out
.select_section
611 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
614 if (targetm
.asm_out
.function_section
)
615 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
618 return hot_function_section (decl
);
622 /* Return the section for function DECL.
624 If DECL is NULL_TREE, return the text section. We can be passed
625 NULL_TREE under some circumstances by dbxout.c at least. */
628 function_section (tree decl
)
630 /* Handle cases where function splitting code decides
631 to put function entry point into unlikely executed section
632 despite the fact that the function itself is not cold
633 (i.e. it is called rarely but contains a hot loop that is
634 better to live in hot subsection for the code locality). */
635 return function_section_1 (decl
,
636 first_function_block_is_cold
);
639 /* Return the section for the current function, take IN_COLD_SECTION_P
643 current_function_section (void)
645 return function_section_1 (current_function_decl
, in_cold_section_p
);
648 /* Tell assembler to switch to unlikely-to-be-executed text section. */
651 unlikely_text_section (void)
653 return function_section_1 (current_function_decl
, true);
656 /* When called within a function context, return true if the function
657 has been assigned a cold text section and if SECT is that section.
658 When called outside a function context, return true if SECT is the
659 default cold section. */
662 unlikely_text_section_p (section
*sect
)
664 return sect
== function_section_1 (current_function_decl
, true);
667 /* Return the read-only data section associated with function DECL. */
670 default_function_rodata_section (tree decl
)
672 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
674 const char *name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
676 if (DECL_ONE_ONLY (decl
) && HAVE_COMDAT_GROUP
)
682 dot
= strchr (name
+ 1, '.');
685 len
= strlen (dot
) + 8;
686 rname
= (char *) alloca (len
);
688 strcpy (rname
, ".rodata");
690 return get_section (rname
, SECTION_LINKONCE
, decl
);
692 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
693 else if (DECL_ONE_ONLY (decl
)
694 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
696 size_t len
= strlen (name
) + 1;
697 char *rname
= (char *) alloca (len
);
699 memcpy (rname
, name
, len
);
701 return get_section (rname
, SECTION_LINKONCE
, decl
);
703 /* For .text.foo we want to use .rodata.foo. */
704 else if (flag_function_sections
&& flag_data_sections
705 && strncmp (name
, ".text.", 6) == 0)
707 size_t len
= strlen (name
) + 1;
708 char *rname
= (char *) alloca (len
+ 2);
710 memcpy (rname
, ".rodata", 7);
711 memcpy (rname
+ 7, name
+ 5, len
- 5);
712 return get_section (rname
, 0, decl
);
716 return readonly_data_section
;
719 /* Return the read-only data section associated with function DECL
720 for targets where that section should be always the single
721 readonly data section. */
724 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
726 return readonly_data_section
;
729 /* Return the section to use for string merging. */
732 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
733 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
734 unsigned int flags ATTRIBUTE_UNUSED
)
738 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
739 && TREE_CODE (decl
) == STRING_CST
740 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
742 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
743 && TREE_STRING_LENGTH (decl
) >= len
)
745 enum machine_mode mode
;
746 unsigned int modesize
;
750 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
751 char *name
= (char *) alloca (strlen (prefix
) + 30);
753 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
754 modesize
= GET_MODE_BITSIZE (mode
);
755 if (modesize
>= 8 && modesize
<= 256
756 && (modesize
& (modesize
- 1)) == 0)
758 if (align
< modesize
)
761 str
= TREE_STRING_POINTER (decl
);
762 unit
= GET_MODE_SIZE (mode
);
764 /* Check for embedded NUL characters. */
765 for (i
= 0; i
< len
; i
+= unit
)
767 for (j
= 0; j
< unit
; j
++)
768 if (str
[i
+ j
] != '\0')
775 sprintf (name
, "%s.str%d.%d", prefix
,
776 modesize
/ 8, (int) (align
/ 8));
777 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
778 return get_section (name
, flags
, NULL
);
783 return readonly_data_section
;
786 /* Return the section to use for constant merging. */
789 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
790 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
791 unsigned int flags ATTRIBUTE_UNUSED
)
793 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
795 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
801 && (align
& (align
- 1)) == 0)
803 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
804 char *name
= (char *) alloca (strlen (prefix
) + 30);
806 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
807 flags
|= (align
/ 8) | SECTION_MERGE
;
808 return get_section (name
, flags
, NULL
);
810 return readonly_data_section
;
813 /* Given NAME, a putative register name, discard any customary prefixes. */
816 strip_reg_name (const char *name
)
818 #ifdef REGISTER_PREFIX
819 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
820 name
+= strlen (REGISTER_PREFIX
);
822 if (name
[0] == '%' || name
[0] == '#')
827 /* The user has asked for a DECL to have a particular name. Set (or
828 change) it in such a way that we don't prefix an underscore to
831 set_user_assembler_name (tree decl
, const char *name
)
833 char *starred
= (char *) alloca (strlen (name
) + 2);
835 strcpy (starred
+ 1, name
);
836 change_decl_assembler_name (decl
, get_identifier (starred
));
837 SET_DECL_RTL (decl
, NULL_RTX
);
840 /* Decode an `asm' spec for a declaration as a register name.
841 Return the register number, or -1 if nothing specified,
842 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
843 or -3 if ASMSPEC is `cc' and is not recognized,
844 or -4 if ASMSPEC is `memory' and is not recognized.
845 Accept an exact spelling or a decimal number.
846 Prefixes such as % are optional. */
849 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
851 /* Presume just one register is clobbered. */
858 /* Get rid of confusing prefixes. */
859 asmspec
= strip_reg_name (asmspec
);
861 /* Allow a decimal number as a "register name". */
862 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
863 if (! ISDIGIT (asmspec
[i
]))
865 if (asmspec
[0] != 0 && i
< 0)
868 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0)
874 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
876 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
879 #ifdef OVERLAPPING_REGISTER_NAMES
883 const char *const name
;
886 } table
[] = OVERLAPPING_REGISTER_NAMES
;
888 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
890 && ! strcmp (asmspec
, table
[i
].name
))
892 *pnregs
= table
[i
].nregs
;
893 return table
[i
].number
;
896 #endif /* OVERLAPPING_REGISTER_NAMES */
898 #ifdef ADDITIONAL_REGISTER_NAMES
900 static const struct { const char *const name
; const int number
; } table
[]
901 = ADDITIONAL_REGISTER_NAMES
;
903 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
905 && ! strcmp (asmspec
, table
[i
].name
))
906 return table
[i
].number
;
908 #endif /* ADDITIONAL_REGISTER_NAMES */
910 if (!strcmp (asmspec
, "memory"))
913 if (!strcmp (asmspec
, "cc"))
923 decode_reg_name (const char *name
)
926 return decode_reg_name_and_count (name
, &count
);
930 /* Return true if DECL's initializer is suitable for a BSS section. */
933 bss_initializer_p (const_tree decl
)
935 return (DECL_INITIAL (decl
) == NULL
936 || DECL_INITIAL (decl
) == error_mark_node
937 || (flag_zero_initialized_in_bss
938 /* Leave constant zeroes in .rodata so they
940 && !TREE_READONLY (decl
)
941 && initializer_zerop (DECL_INITIAL (decl
))));
944 /* Compute the alignment of variable specified by DECL.
945 DONT_OUTPUT_DATA is from assemble_variable. */
948 align_variable (tree decl
, bool dont_output_data
)
950 unsigned int align
= DECL_ALIGN (decl
);
952 /* In the case for initialing an array whose length isn't specified,
953 where we have not yet been able to do the layout,
954 figure out the proper alignment now. */
955 if (dont_output_data
&& DECL_SIZE (decl
) == 0
956 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
957 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
959 /* Some object file formats have a maximum alignment which they support.
960 In particular, a.out format supports a maximum alignment of 4. */
961 if (align
> MAX_OFILE_ALIGNMENT
)
963 warning (0, "alignment of %q+D is greater than maximum object "
964 "file alignment. Using %d", decl
,
965 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
966 align
= MAX_OFILE_ALIGNMENT
;
969 /* On some machines, it is good to increase alignment sometimes. */
970 if (! DECL_USER_ALIGN (decl
))
972 #ifdef DATA_ALIGNMENT
973 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
974 /* Don't increase alignment too much for TLS variables - TLS space
976 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
979 #ifdef CONSTANT_ALIGNMENT
980 if (DECL_INITIAL (decl
) != 0 && DECL_INITIAL (decl
) != error_mark_node
)
982 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
984 /* Don't increase alignment too much for TLS variables - TLS space
986 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
992 /* Reset the alignment in case we have made it tighter, so we can benefit
993 from it in get_pointer_alignment. */
994 DECL_ALIGN (decl
) = align
;
997 /* Return the section into which the given VAR_DECL or CONST_DECL
998 should be placed. PREFER_NOSWITCH_P is true if a noswitch
999 section should be used wherever possible. */
1002 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1004 addr_space_t as
= ADDR_SPACE_GENERIC
;
1007 if (TREE_TYPE (decl
) != error_mark_node
)
1008 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1010 if (DECL_COMMON (decl
))
1012 /* If the decl has been given an explicit section name, or it resides
1013 in a non-generic address space, then it isn't common, and shouldn't
1014 be handled as such. */
1015 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1016 && ADDR_SPACE_GENERIC_P (as
));
1017 if (DECL_THREAD_LOCAL_P (decl
))
1018 return tls_comm_section
;
1019 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1020 return comm_section
;
1023 if (DECL_INITIAL (decl
) == error_mark_node
)
1024 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1025 else if (DECL_INITIAL (decl
))
1026 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1030 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1031 if (IN_NAMED_SECTION (decl
))
1032 return get_named_section (decl
, NULL
, reloc
);
1034 if (ADDR_SPACE_GENERIC_P (as
)
1035 && !DECL_THREAD_LOCAL_P (decl
)
1036 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1037 && bss_initializer_p (decl
))
1039 if (!TREE_PUBLIC (decl
)
1040 && !(flag_asan
&& asan_protect_global (decl
)))
1041 return lcomm_section
;
1042 if (bss_noswitch_section
)
1043 return bss_noswitch_section
;
1046 return targetm
.asm_out
.select_section (decl
, reloc
, DECL_ALIGN (decl
));
1049 /* Return the block into which object_block DECL should be placed. */
1051 static struct object_block
*
1052 get_block_for_decl (tree decl
)
1056 if (TREE_CODE (decl
) == VAR_DECL
)
1058 /* The object must be defined in this translation unit. */
1059 if (DECL_EXTERNAL (decl
))
1062 /* There's no point using object blocks for something that is
1063 isolated by definition. */
1064 if (DECL_ONE_ONLY (decl
))
1068 /* We can only calculate block offsets if the decl has a known
1070 if (DECL_SIZE_UNIT (decl
) == NULL
)
1072 if (!host_integerp (DECL_SIZE_UNIT (decl
), 1))
1075 /* Find out which section should contain DECL. We cannot put it into
1076 an object block if it requires a standalone definition. */
1077 if (TREE_CODE (decl
) == VAR_DECL
)
1078 align_variable (decl
, 0);
1079 sect
= get_variable_section (decl
, true);
1080 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1083 return get_block_for_section (sect
);
1086 /* Make sure block symbol SYMBOL is in block BLOCK. */
1089 change_symbol_block (rtx symbol
, struct object_block
*block
)
1091 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1093 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1094 SYMBOL_REF_BLOCK (symbol
) = block
;
1098 /* Return true if it is possible to put DECL in an object_block. */
1101 use_blocks_for_decl_p (tree decl
)
1103 /* Only data DECLs can be placed into object blocks. */
1104 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1107 /* Detect decls created by dw2_force_const_mem. Such decls are
1108 special because DECL_INITIAL doesn't specify the decl's true value.
1109 dw2_output_indirect_constants will instead call assemble_variable
1110 with dont_output_data set to 1 and then print the contents itself. */
1111 if (DECL_INITIAL (decl
) == decl
)
1114 /* If this decl is an alias, then we don't want to emit a
1116 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)))
1119 return targetm
.use_blocks_for_decl_p (decl
);
1122 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1123 have static storage duration. In other words, it should not be an
1124 automatic variable, including PARM_DECLs.
1126 There is, however, one exception: this function handles variables
1127 explicitly placed in a particular register by the user.
1129 This is never called for PARM_DECL nodes. */
1132 make_decl_rtl (tree decl
)
1134 const char *name
= 0;
1138 /* Check that we are not being given an automatic variable. */
1139 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1140 && TREE_CODE (decl
) != RESULT_DECL
);
1142 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1143 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1144 || TREE_STATIC (decl
)
1145 || TREE_PUBLIC (decl
)
1146 || DECL_EXTERNAL (decl
)
1147 || DECL_REGISTER (decl
));
1149 /* And that we were not given a type or a label. */
1150 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1151 && TREE_CODE (decl
) != LABEL_DECL
);
1153 /* For a duplicate declaration, we can be called twice on the
1154 same DECL node. Don't discard the RTL already made. */
1155 if (DECL_RTL_SET_P (decl
))
1157 /* If the old RTL had the wrong mode, fix the mode. */
1158 x
= DECL_RTL (decl
);
1159 if (GET_MODE (x
) != DECL_MODE (decl
))
1160 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1162 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1165 /* ??? Another way to do this would be to maintain a hashed
1166 table of such critters. Instead of adding stuff to a DECL
1167 to give certain attributes to it, we could use an external
1168 hash map from DECL to set of attributes. */
1170 /* Let the target reassign the RTL if it wants.
1171 This is necessary, for example, when one machine specific
1172 decl attribute overrides another. */
1173 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1175 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1176 on the new decl information. */
1178 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1179 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1180 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1182 /* Make this function static known to the mudflap runtime. */
1183 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1184 mudflap_enqueue_decl (decl
);
1189 /* If this variable belongs to the global constant pool, retrieve the
1190 pre-computed RTL or recompute it in LTO mode. */
1191 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_IN_CONSTANT_POOL (decl
))
1193 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1197 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
1199 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1200 && DECL_REGISTER (decl
))
1202 error ("register name not specified for %q+D", decl
);
1204 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1206 const char *asmspec
= name
+1;
1207 enum machine_mode mode
= DECL_MODE (decl
);
1208 reg_number
= decode_reg_name (asmspec
);
1209 /* First detect errors in declaring global registers. */
1210 if (reg_number
== -1)
1211 error ("register name not specified for %q+D", decl
);
1212 else if (reg_number
< 0)
1213 error ("invalid register name for %q+D", decl
);
1214 else if (mode
== BLKmode
)
1215 error ("data type of %q+D isn%'t suitable for a register",
1217 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1218 error ("the register specified for %q+D cannot be accessed"
1219 " by the current target", decl
);
1220 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1221 error ("the register specified for %q+D is not general enough"
1222 " to be used as a register variable", decl
);
1223 else if (!HARD_REGNO_MODE_OK (reg_number
, mode
))
1224 error ("register specified for %q+D isn%'t suitable for data type",
1226 /* Now handle properly declared static register variables. */
1231 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1233 DECL_INITIAL (decl
) = 0;
1234 error ("global register variable has initial value");
1236 if (TREE_THIS_VOLATILE (decl
))
1237 warning (OPT_Wvolatile_register_var
,
1238 "optimization may eliminate reads and/or "
1239 "writes to register variables");
1241 /* If the user specified one of the eliminables registers here,
1242 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1243 confused with that register and be eliminated. This usage is
1244 somewhat suspect... */
1246 SET_DECL_RTL (decl
, gen_rtx_raw_REG (mode
, reg_number
));
1247 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1248 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1250 if (TREE_STATIC (decl
))
1252 /* Make this register global, so not usable for anything
1254 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1255 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1256 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1258 nregs
= hard_regno_nregs
[reg_number
][mode
];
1260 globalize_reg (decl
, reg_number
+ --nregs
);
1263 /* As a register variable, it has no section. */
1267 /* Now handle ordinary static variables and functions (in memory).
1268 Also handle vars declared register invalidly. */
1269 else if (name
[0] == '*')
1271 #ifdef REGISTER_PREFIX
1272 if (strlen (REGISTER_PREFIX
) != 0)
1274 reg_number
= decode_reg_name (name
);
1275 if (reg_number
>= 0 || reg_number
== -3)
1276 error ("register name given for non-register variable %q+D", decl
);
1281 /* Specifying a section attribute on a variable forces it into a
1282 non-.bss section, and thus it cannot be common. */
1283 /* FIXME: In general this code should not be necessary because
1284 visibility pass is doing the same work. But notice_global_symbol
1285 is called early and it needs to make DECL_RTL to get the name.
1286 we take care of recomputing the DECL_RTL after visibility is changed. */
1287 if (TREE_CODE (decl
) == VAR_DECL
1288 && DECL_SECTION_NAME (decl
) != NULL_TREE
1289 && DECL_INITIAL (decl
) == NULL_TREE
1290 && DECL_COMMON (decl
))
1291 DECL_COMMON (decl
) = 0;
1293 /* Variables can't be both common and weak. */
1294 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1295 DECL_COMMON (decl
) = 0;
1297 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1298 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1301 enum machine_mode address_mode
= Pmode
;
1302 if (TREE_TYPE (decl
) != error_mark_node
)
1304 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1305 address_mode
= targetm
.addr_space
.address_mode (as
);
1307 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1309 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1310 SET_SYMBOL_REF_DECL (x
, decl
);
1312 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1313 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1314 set_mem_attributes (x
, decl
, 1);
1315 SET_DECL_RTL (decl
, x
);
1317 /* Optionally set flags or add text to the name to record information
1318 such as that it is a function name.
1319 If the name is changed, the macro ASM_OUTPUT_LABELREF
1320 will have to know how to strip this information. */
1321 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1323 /* Make this function static known to the mudflap runtime. */
1324 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1325 mudflap_enqueue_decl (decl
);
1328 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1329 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1333 make_decl_rtl_for_debug (tree decl
)
1335 unsigned int save_aliasing_flag
, save_mudflap_flag
;
1338 if (DECL_RTL_SET_P (decl
))
1339 return DECL_RTL (decl
);
1341 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1342 call new_alias_set. If running with -fcompare-debug, sometimes
1343 we do not want to create alias sets that will throw the alias
1344 numbers off in the comparison dumps. So... clearing
1345 flag_strict_aliasing will keep new_alias_set() from creating a
1346 new set. It is undesirable to register decl with mudflap
1347 in this case as well. */
1348 save_aliasing_flag
= flag_strict_aliasing
;
1349 flag_strict_aliasing
= 0;
1350 save_mudflap_flag
= flag_mudflap
;
1353 rtl
= DECL_RTL (decl
);
1354 /* Reset DECL_RTL back, as various parts of the compiler expects
1355 DECL_RTL set meaning it is actually going to be output. */
1356 SET_DECL_RTL (decl
, NULL
);
1358 flag_strict_aliasing
= save_aliasing_flag
;
1359 flag_mudflap
= save_mudflap_flag
;
1364 /* Output a string of literal assembler code
1365 for an `asm' keyword used between functions. */
1368 assemble_asm (tree string
)
1373 if (TREE_CODE (string
) == ADDR_EXPR
)
1374 string
= TREE_OPERAND (string
, 0);
1376 p
= TREE_STRING_POINTER (string
);
1377 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1380 /* Write the address of the entity given by SYMBOL to SEC. */
1382 assemble_addr_to_section (rtx symbol
, section
*sec
)
1384 switch_to_section (sec
);
1385 assemble_align (POINTER_SIZE
);
1386 assemble_integer (symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1389 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1390 not) section for PRIORITY. */
1392 get_cdtor_priority_section (int priority
, bool constructor_p
)
1396 /* ??? This only works reliably with the GNU linker. */
1397 sprintf (buf
, "%s.%.5u",
1398 constructor_p
? ".ctors" : ".dtors",
1399 /* Invert the numbering so the linker puts us in the proper
1400 order; constructors are run from right to left, and the
1401 linker sorts in increasing order. */
1402 MAX_INIT_PRIORITY
- priority
);
1403 return get_section (buf
, SECTION_WRITE
, NULL
);
1407 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1411 if (priority
!= DEFAULT_INIT_PRIORITY
)
1412 sec
= get_cdtor_priority_section (priority
,
1413 /*constructor_p=*/false);
1415 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1417 assemble_addr_to_section (symbol
, sec
);
1420 #ifdef DTORS_SECTION_ASM_OP
1422 default_dtor_section_asm_out_destructor (rtx symbol
,
1423 int priority ATTRIBUTE_UNUSED
)
1425 assemble_addr_to_section (symbol
, dtors_section
);
1430 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1434 if (priority
!= DEFAULT_INIT_PRIORITY
)
1435 sec
= get_cdtor_priority_section (priority
,
1436 /*constructor_p=*/true);
1438 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1440 assemble_addr_to_section (symbol
, sec
);
1443 #ifdef CTORS_SECTION_ASM_OP
1445 default_ctor_section_asm_out_constructor (rtx symbol
,
1446 int priority ATTRIBUTE_UNUSED
)
1448 assemble_addr_to_section (symbol
, ctors_section
);
1452 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1453 a nonzero value if the constant pool should be output before the
1454 start of the function, or a zero value if the pool should output
1455 after the end of the function. The default is to put it before the
1458 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1459 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1462 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1463 to be output to assembler.
1464 Set first_global_object_name and weak_global_object_name as appropriate. */
1467 notice_global_symbol (tree decl
)
1469 const char **type
= &first_global_object_name
;
1471 if (first_global_object_name
1472 || !TREE_PUBLIC (decl
)
1473 || DECL_EXTERNAL (decl
)
1474 || !DECL_NAME (decl
)
1475 || (TREE_CODE (decl
) != FUNCTION_DECL
1476 && (TREE_CODE (decl
) != VAR_DECL
1477 || (DECL_COMMON (decl
)
1478 && (DECL_INITIAL (decl
) == 0
1479 || DECL_INITIAL (decl
) == error_mark_node
))))
1480 || !MEM_P (DECL_RTL (decl
)))
1483 /* We win when global object is found, but it is useful to know about weak
1484 symbol as well so we can produce nicer unique names. */
1485 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1486 type
= &weak_global_object_name
;
1492 rtx decl_rtl
= DECL_RTL (decl
);
1494 p
= targetm
.strip_name_encoding (XSTR (XEXP (decl_rtl
, 0), 0));
1495 name
= ggc_strdup (p
);
1501 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1502 current function goes into the cold section, so that targets can use
1503 current_function_section during RTL expansion. DECL describes the
1507 decide_function_section (tree decl
)
1509 first_function_block_is_cold
= false;
1511 if (flag_reorder_blocks_and_partition
)
1512 /* We will decide in assemble_start_function. */
1515 if (DECL_SECTION_NAME (decl
))
1517 struct cgraph_node
*node
= cgraph_get_node (current_function_decl
);
1518 /* Calls to function_section rely on first_function_block_is_cold
1520 first_function_block_is_cold
= (node
1522 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1525 in_cold_section_p
= first_function_block_is_cold
;
1528 /* Output assembler code for the constant pool of a function and associated
1529 with defining the name of the function. DECL describes the function.
1530 NAME is the function's name. For the constant pool, we use the current
1531 constant pool data. */
1534 assemble_start_function (tree decl
, const char *fnname
)
1537 char tmp_label
[100];
1538 bool hot_label_written
= false;
1540 if (flag_reorder_blocks_and_partition
)
1542 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1543 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1544 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1545 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1546 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1547 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1548 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1549 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1554 crtl
->subsections
.hot_section_label
= NULL
;
1555 crtl
->subsections
.cold_section_label
= NULL
;
1556 crtl
->subsections
.hot_section_end_label
= NULL
;
1557 crtl
->subsections
.cold_section_end_label
= NULL
;
1560 /* The following code does not need preprocessing in the assembler. */
1564 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1565 output_constant_pool (fnname
, decl
);
1567 /* Make sure the not and cold text (code) sections are properly
1568 aligned. This is necessary here in the case where the function
1569 has both hot and cold sections, because we don't want to re-set
1570 the alignment when the section switch happens mid-function. */
1572 if (flag_reorder_blocks_and_partition
)
1574 first_function_block_is_cold
= false;
1576 switch_to_section (unlikely_text_section ());
1577 assemble_align (DECL_ALIGN (decl
));
1578 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1580 /* When the function starts with a cold section, we need to explicitly
1581 align the hot section and write out the hot section label.
1582 But if the current function is a thunk, we do not have a CFG. */
1584 && BB_PARTITION (ENTRY_BLOCK_PTR
->next_bb
) == BB_COLD_PARTITION
)
1586 switch_to_section (text_section
);
1587 assemble_align (DECL_ALIGN (decl
));
1588 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1589 hot_label_written
= true;
1590 first_function_block_is_cold
= true;
1592 in_cold_section_p
= first_function_block_is_cold
;
1596 /* Switch to the correct text section for the start of the function. */
1598 switch_to_section (function_section (decl
));
1599 if (flag_reorder_blocks_and_partition
1600 && !hot_label_written
)
1601 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1603 /* Tell assembler to move to target machine's alignment for functions. */
1604 align
= floor_log2 (DECL_ALIGN (decl
) / BITS_PER_UNIT
);
1607 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1610 /* Handle a user-specified function alignment.
1611 Note that we still need to align to DECL_ALIGN, as above,
1612 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1613 if (! DECL_USER_ALIGN (decl
)
1614 && align_functions_log
> align
1615 && optimize_function_for_speed_p (cfun
))
1617 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1618 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1619 align_functions_log
, align_functions
- 1);
1621 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1625 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1626 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1629 if (!DECL_IGNORED_P (decl
))
1630 (*debug_hooks
->begin_function
) (decl
);
1632 /* Make function name accessible from other files, if appropriate. */
1634 if (TREE_PUBLIC (decl
))
1636 notice_global_symbol (decl
);
1638 globalize_decl (decl
);
1640 maybe_assemble_visibility (decl
);
1643 if (DECL_PRESERVE_P (decl
))
1644 targetm
.asm_out
.mark_decl_preserved (fnname
);
1646 /* Do any machine/system dependent processing of the function name. */
1647 #ifdef ASM_DECLARE_FUNCTION_NAME
1648 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1650 /* Standard thing is just output label for the function. */
1651 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1652 #endif /* ASM_DECLARE_FUNCTION_NAME */
1654 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1655 saw_no_split_stack
= true;
1658 /* Output assembler code associated with defining the size of the
1659 function. DECL describes the function. NAME is the function's name. */
1662 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1664 #ifdef ASM_DECLARE_FUNCTION_SIZE
1665 /* We could have switched section in the middle of the function. */
1666 if (flag_reorder_blocks_and_partition
)
1667 switch_to_section (function_section (decl
));
1668 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1670 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1672 output_constant_pool (fnname
, decl
);
1673 switch_to_section (function_section (decl
)); /* need to switch back */
1675 /* Output labels for end of hot/cold text sections (to be used by
1677 if (flag_reorder_blocks_and_partition
)
1679 section
*save_text_section
;
1681 save_text_section
= in_section
;
1682 switch_to_section (unlikely_text_section ());
1683 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1684 if (first_function_block_is_cold
)
1685 switch_to_section (text_section
);
1687 switch_to_section (function_section (decl
));
1688 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1689 switch_to_section (save_text_section
);
1693 /* Assemble code to leave SIZE bytes of zeros. */
1696 assemble_zeros (unsigned HOST_WIDE_INT size
)
1698 /* Do no output if -fsyntax-only. */
1699 if (flag_syntax_only
)
1702 #ifdef ASM_NO_SKIP_IN_TEXT
1703 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1704 so we must output 0s explicitly in the text section. */
1705 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1707 unsigned HOST_WIDE_INT i
;
1708 for (i
= 0; i
< size
; i
++)
1709 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1714 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1717 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1720 assemble_align (int align
)
1722 if (align
> BITS_PER_UNIT
)
1724 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1728 /* Assemble a string constant with the specified C string as contents. */
1731 assemble_string (const char *p
, int size
)
1736 /* If the string is very long, split it up. */
1740 int thissize
= size
- pos
;
1741 if (thissize
> maximum
)
1744 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1752 /* A noswitch_section_callback for lcomm_section. */
1755 emit_local (tree decl ATTRIBUTE_UNUSED
,
1756 const char *name ATTRIBUTE_UNUSED
,
1757 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1758 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1760 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1761 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1762 size
, DECL_ALIGN (decl
));
1764 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1765 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1768 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1773 /* A noswitch_section_callback for bss_noswitch_section. */
1775 #if defined ASM_OUTPUT_ALIGNED_BSS
1777 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1778 const char *name ATTRIBUTE_UNUSED
,
1779 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1780 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1782 #if defined ASM_OUTPUT_ALIGNED_BSS
1783 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
, DECL_ALIGN (decl
));
1789 /* A noswitch_section_callback for comm_section. */
1792 emit_common (tree decl ATTRIBUTE_UNUSED
,
1793 const char *name ATTRIBUTE_UNUSED
,
1794 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1795 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1797 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1798 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1799 size
, DECL_ALIGN (decl
));
1801 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1802 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1805 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1810 /* A noswitch_section_callback for tls_comm_section. */
1813 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1814 const char *name ATTRIBUTE_UNUSED
,
1815 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1816 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1818 #ifdef ASM_OUTPUT_TLS_COMMON
1819 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
1822 sorry ("thread-local COMMON data not implemented");
1827 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1828 NAME is the name of DECL's SYMBOL_REF. */
1831 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
)
1833 unsigned HOST_WIDE_INT size
, rounded
;
1835 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
1838 if (flag_asan
&& asan_protect_global (decl
))
1839 size
+= asan_red_zone_size (size
);
1841 /* Don't allocate zero bytes of common,
1842 since that means "undefined external" in the linker. */
1846 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1847 so that each uninitialized object starts on such a boundary. */
1848 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
1849 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
1850 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
1852 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
1853 && (unsigned HOST_WIDE_INT
) DECL_ALIGN_UNIT (decl
) > rounded
)
1854 warning (0, "requested alignment for %q+D is greater than "
1855 "implemented alignment of %wu", decl
, rounded
);
1858 /* A subroutine of assemble_variable. Output the label and contents of
1859 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1860 is as for assemble_variable. */
1863 assemble_variable_contents (tree decl
, const char *name
,
1864 bool dont_output_data
)
1866 /* Do any machine/system dependent processing of the object. */
1867 #ifdef ASM_DECLARE_OBJECT_NAME
1868 last_assemble_variable_decl
= decl
;
1869 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
1871 /* Standard thing is just output label for the object. */
1872 ASM_OUTPUT_LABEL (asm_out_file
, name
);
1873 #endif /* ASM_DECLARE_OBJECT_NAME */
1875 if (!dont_output_data
)
1877 if (DECL_INITIAL (decl
)
1878 && DECL_INITIAL (decl
) != error_mark_node
1879 && !initializer_zerop (DECL_INITIAL (decl
)))
1880 /* Output the actual data. */
1881 output_constant (DECL_INITIAL (decl
),
1882 tree_low_cst (DECL_SIZE_UNIT (decl
), 1),
1885 /* Leave space for it. */
1886 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl
), 1));
1890 /* Assemble everything that is needed for a variable or function declaration.
1891 Not used for automatic variables, and not used for function definitions.
1892 Should not be called for variables of incomplete structure type.
1894 TOP_LEVEL is nonzero if this variable has file scope.
1895 AT_END is nonzero if this is the special handling, at end of compilation,
1896 to define things that have had only tentative definitions.
1897 DONT_OUTPUT_DATA if nonzero means don't actually output the
1898 initial value (that will be done by the caller). */
1901 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
1902 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
1905 rtx decl_rtl
, symbol
;
1907 bool asan_protected
= false;
1909 /* This function is supposed to handle VARIABLES. Ensure we have one. */
1910 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
1912 /* Emulated TLS had better not get this far. */
1913 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
1915 last_assemble_variable_decl
= 0;
1917 /* Normally no need to say anything here for external references,
1918 since assemble_external is called by the language-specific code
1919 when a declaration is first seen. */
1921 if (DECL_EXTERNAL (decl
))
1924 /* Do nothing for global register variables. */
1925 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
1927 TREE_ASM_WRITTEN (decl
) = 1;
1931 /* If type was incomplete when the variable was declared,
1932 see if it is complete now. */
1934 if (DECL_SIZE (decl
) == 0)
1935 layout_decl (decl
, 0);
1937 /* Still incomplete => don't allocate it; treat the tentative defn
1938 (which is what it must have been) as an `extern' reference. */
1940 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
1942 error ("storage size of %q+D isn%'t known", decl
);
1943 TREE_ASM_WRITTEN (decl
) = 1;
1947 /* The first declaration of a variable that comes through this function
1948 decides whether it is global (in C, has external linkage)
1949 or local (in C, has internal linkage). So do nothing more
1950 if this function has already run. */
1952 if (TREE_ASM_WRITTEN (decl
))
1955 /* Make sure targetm.encode_section_info is invoked before we set
1957 decl_rtl
= DECL_RTL (decl
);
1959 TREE_ASM_WRITTEN (decl
) = 1;
1961 /* Do no output if -fsyntax-only. */
1962 if (flag_syntax_only
)
1965 if (! dont_output_data
1966 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
1968 error ("size of variable %q+D is too large", decl
);
1972 gcc_assert (MEM_P (decl_rtl
));
1973 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
1974 symbol
= XEXP (decl_rtl
, 0);
1976 /* If this symbol belongs to the tree constant pool, output the constant
1977 if it hasn't already been written. */
1978 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
1980 tree decl
= SYMBOL_REF_DECL (symbol
);
1981 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
1982 output_constant_def_contents (symbol
);
1988 name
= XSTR (symbol
, 0);
1989 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
1990 notice_global_symbol (decl
);
1992 /* Compute the alignment of this data. */
1994 align_variable (decl
, dont_output_data
);
1997 && asan_protect_global (decl
))
1999 asan_protected
= true;
2000 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
2001 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
2004 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2006 if (TREE_PUBLIC (decl
))
2007 maybe_assemble_visibility (decl
);
2009 if (DECL_PRESERVE_P (decl
))
2010 targetm
.asm_out
.mark_decl_preserved (name
);
2012 /* First make the assembler name(s) global if appropriate. */
2013 sect
= get_variable_section (decl
, false);
2014 if (TREE_PUBLIC (decl
)
2015 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2016 globalize_decl (decl
);
2018 /* Output any data that we will need to use the address of. */
2019 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2020 output_addressed_constants (DECL_INITIAL (decl
));
2022 /* dbxout.c needs to know this. */
2023 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2024 DECL_IN_TEXT_SECTION (decl
) = 1;
2026 /* If the decl is part of an object_block, make sure that the decl
2027 has been positioned within its block, but do not write out its
2028 definition yet. output_object_blocks will do that later. */
2029 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2031 gcc_assert (!dont_output_data
);
2032 place_block_symbol (symbol
);
2034 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2035 assemble_noswitch_variable (decl
, name
, sect
);
2038 switch_to_section (sect
);
2039 if (DECL_ALIGN (decl
) > BITS_PER_UNIT
)
2040 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (DECL_ALIGN_UNIT (decl
)));
2041 assemble_variable_contents (decl
, name
, dont_output_data
);
2044 unsigned HOST_WIDE_INT
int size
2045 = tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
2046 assemble_zeros (asan_red_zone_size (size
));
2051 /* Return 1 if type TYPE contains any pointers. */
2054 contains_pointers_p (tree type
)
2056 switch (TREE_CODE (type
))
2059 case REFERENCE_TYPE
:
2060 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2061 so I'll play safe and return 1. */
2067 case QUAL_UNION_TYPE
:
2070 /* For a type that has fields, see if the fields have pointers. */
2071 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2072 if (TREE_CODE (fields
) == FIELD_DECL
2073 && contains_pointers_p (TREE_TYPE (fields
)))
2079 /* An array type contains pointers if its element type does. */
2080 return contains_pointers_p (TREE_TYPE (type
));
2087 /* We delay assemble_external processing until
2088 the compilation unit is finalized. This is the best we can do for
2089 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2090 it all the way to final. See PR 17982 for further discussion. */
2091 static GTY(()) tree pending_assemble_externals
;
2093 #ifdef ASM_OUTPUT_EXTERNAL
2094 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2095 As a result, assemble_external can be called after the list of externals
2096 is processed and the pointer set destroyed. */
2097 static bool pending_assemble_externals_processed
;
2099 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2100 TREE_LIST in assemble_external. */
2101 static struct pointer_set_t
*pending_assemble_externals_set
;
2103 /* True if DECL is a function decl for which no out-of-line copy exists.
2104 It is assumed that DECL's assembler name has been set. */
2107 incorporeal_function_p (tree decl
)
2109 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2113 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2114 && (DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
2115 || DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA_WITH_ALIGN
))
2118 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2119 /* Atomic or sync builtins which have survived this far will be
2120 resolved externally and therefore are not incorporeal. */
2121 if (strncmp (name
, "__builtin_", 10) == 0)
2127 /* Actually do the tests to determine if this is necessary, and invoke
2128 ASM_OUTPUT_EXTERNAL. */
2130 assemble_external_real (tree decl
)
2132 rtx rtl
= DECL_RTL (decl
);
2134 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2135 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2136 && !incorporeal_function_p (decl
))
2138 /* Some systems do require some output. */
2139 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2140 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2146 process_pending_assemble_externals (void)
2148 #ifdef ASM_OUTPUT_EXTERNAL
2150 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2151 assemble_external_real (TREE_VALUE (list
));
2153 pending_assemble_externals
= 0;
2154 pending_assemble_externals_processed
= true;
2155 pointer_set_destroy (pending_assemble_externals_set
);
2159 /* This TREE_LIST contains any weak symbol declarations waiting
2161 static GTY(()) tree weak_decls
;
2163 /* Output something to declare an external symbol to the assembler,
2164 and qualifiers such as weakness. (Most assemblers don't need
2165 extern declaration, so we normally output nothing.) Do nothing if
2166 DECL is not external. */
2169 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2171 /* Make sure that the ASM_OUT_FILE is open.
2172 If it's not, we should not be calling this function. */
2173 gcc_assert (asm_out_file
);
2175 /* In a perfect world, the following condition would be true.
2176 Sadly, the Java and Go front ends emit assembly *from the front end*,
2177 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2179 /* This function should only be called if we are expanding, or have
2181 Ideally, only final.c would be calling this function, but it is
2182 not clear whether that would break things somehow. See PR 17982
2183 for further discussion. */
2184 gcc_assert (cgraph_state
== CGRAPH_STATE_EXPANSION
2185 || cgraph_state
== CGRAPH_STATE_FINISHED
);
2188 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2191 /* We want to output annotation for weak and external symbols at
2192 very last to check if they are references or not. */
2194 if (TARGET_SUPPORTS_WEAK
2196 /* TREE_STATIC is a weird and abused creature which is not
2197 generally the right test for whether an entity has been
2198 locally emitted, inlined or otherwise not-really-extern, but
2199 for declarations that can be weak, it happens to be
2201 && !TREE_STATIC (decl
)
2202 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2203 && value_member (decl
, weak_decls
) == NULL_TREE
)
2204 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2206 #ifdef ASM_OUTPUT_EXTERNAL
2207 if (pending_assemble_externals_processed
)
2209 assemble_external_real (decl
);
2213 if (! pointer_set_insert (pending_assemble_externals_set
, decl
))
2214 pending_assemble_externals
= tree_cons (NULL
, decl
,
2215 pending_assemble_externals
);
2219 /* Similar, for calling a library function FUN. */
2222 assemble_external_libcall (rtx fun
)
2224 /* Declare library function name external when first used, if nec. */
2225 if (! SYMBOL_REF_USED (fun
))
2227 SYMBOL_REF_USED (fun
) = 1;
2228 targetm
.asm_out
.external_libcall (fun
);
2232 /* Assemble a label named NAME. */
2235 assemble_label (FILE *file
, const char *name
)
2237 ASM_OUTPUT_LABEL (file
, name
);
2240 /* Set the symbol_referenced flag for ID. */
2242 mark_referenced (tree id
)
2244 TREE_SYMBOL_REFERENCED (id
) = 1;
2247 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2248 until we find an identifier that is not itself a transparent alias.
2249 Modify the alias passed to it by reference (and all aliases on the
2250 way to the ultimate target), such that they do not have to be
2251 followed again, and return the ultimate target of the alias
2255 ultimate_transparent_alias_target (tree
*alias
)
2257 tree target
= *alias
;
2259 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
2261 gcc_assert (TREE_CHAIN (target
));
2262 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
2263 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
2264 && ! TREE_CHAIN (target
));
2271 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2272 starts with a *, the rest of NAME is output verbatim. Otherwise
2273 NAME is transformed in a target-specific way (usually by the
2274 addition of an underscore). */
2277 assemble_name_raw (FILE *file
, const char *name
)
2280 fputs (&name
[1], file
);
2282 ASM_OUTPUT_LABELREF (file
, name
);
2285 /* Like assemble_name_raw, but should be used when NAME might refer to
2286 an entity that is also represented as a tree (like a function or
2287 variable). If NAME does refer to such an entity, that entity will
2288 be marked as referenced. */
2291 assemble_name (FILE *file
, const char *name
)
2293 const char *real_name
;
2296 real_name
= targetm
.strip_name_encoding (name
);
2298 id
= maybe_get_identifier (real_name
);
2303 mark_referenced (id
);
2304 ultimate_transparent_alias_target (&id
);
2306 name
= IDENTIFIER_POINTER (id
);
2307 gcc_assert (! TREE_CHAIN (id
));
2310 assemble_name_raw (file
, name
);
2313 /* Allocate SIZE bytes writable static space with a gensym name
2314 and return an RTX to refer to its address. */
2317 assemble_static_space (unsigned HOST_WIDE_INT size
)
2320 const char *namestring
;
2323 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2325 namestring
= ggc_strdup (name
);
2327 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2328 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2330 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2331 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2334 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2335 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2338 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2339 so that each uninitialized object starts on such a boundary. */
2340 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2341 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2342 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2343 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2344 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2345 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2352 /* Assemble the static constant template for function entry trampolines.
2353 This is done at most once per compilation.
2354 Returns an RTX for the address of the template. */
2356 static GTY(()) rtx initial_trampoline
;
2359 assemble_trampoline_template (void)
2366 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2368 if (initial_trampoline
)
2369 return initial_trampoline
;
2371 /* By default, put trampoline templates in read-only data section. */
2373 #ifdef TRAMPOLINE_SECTION
2374 switch_to_section (TRAMPOLINE_SECTION
);
2376 switch_to_section (readonly_data_section
);
2379 /* Write the assembler code to define one. */
2380 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2382 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2384 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2385 targetm
.asm_out
.trampoline_template (asm_out_file
);
2387 /* Record the rtl to refer to it. */
2388 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2389 name
= ggc_strdup (label
);
2390 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2391 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2393 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2394 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2395 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2397 return initial_trampoline
;
2400 /* A and B are either alignments or offsets. Return the minimum alignment
2401 that may be assumed after adding the two together. */
2403 static inline unsigned
2404 min_align (unsigned int a
, unsigned int b
)
2406 return (a
| b
) & -(a
| b
);
2409 /* Return the assembler directive for creating a given kind of integer
2410 object. SIZE is the number of bytes in the object and ALIGNED_P
2411 indicates whether it is known to be aligned. Return NULL if the
2412 assembly dialect has no such directive.
2414 The returned string should be printed at the start of a new line and
2415 be followed immediately by the object's initial value. */
2418 integer_asm_op (int size
, int aligned_p
)
2420 struct asm_int_op
*ops
;
2423 ops
= &targetm
.asm_out
.aligned_op
;
2425 ops
= &targetm
.asm_out
.unaligned_op
;
2430 return targetm
.asm_out
.byte_op
;
2444 /* Use directive OP to assemble an integer object X. Print OP at the
2445 start of the line, followed immediately by the value of X. */
2448 assemble_integer_with_op (const char *op
, rtx x
)
2450 fputs (op
, asm_out_file
);
2451 output_addr_const (asm_out_file
, x
);
2452 fputc ('\n', asm_out_file
);
2455 /* The default implementation of the asm_out.integer target hook. */
2458 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2459 unsigned int size ATTRIBUTE_UNUSED
,
2460 int aligned_p ATTRIBUTE_UNUSED
)
2462 const char *op
= integer_asm_op (size
, aligned_p
);
2463 /* Avoid GAS bugs for large values. Specifically negative values whose
2464 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2465 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE
/ BITS_PER_UNIT
)
2467 return op
&& (assemble_integer_with_op (op
, x
), true);
2470 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2471 the alignment of the integer in bits. Return 1 if we were able to output
2472 the constant, otherwise 0. We must be able to output the constant,
2473 if FORCE is nonzero. */
2476 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2480 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2482 /* See if the target hook can handle this kind of object. */
2483 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2486 /* If the object is a multi-byte one, try splitting it up. Split
2487 it into words it if is multi-word, otherwise split it into bytes. */
2490 enum machine_mode omode
, imode
;
2491 unsigned int subalign
;
2492 unsigned int subsize
, i
;
2493 enum mode_class mclass
;
2495 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2496 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2497 if (GET_CODE (x
) == CONST_FIXED
)
2498 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2502 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2503 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2505 for (i
= 0; i
< size
; i
+= subsize
)
2507 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2508 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2514 /* If we've printed some of it, but not all of it, there's no going
2519 gcc_assert (!force
);
2525 assemble_real (REAL_VALUE_TYPE d
, enum machine_mode mode
, unsigned int align
)
2527 long data
[4] = {0, 0, 0, 0};
2529 int bitsize
, nelts
, nunits
, units_per
;
2531 /* This is hairy. We have a quantity of known size. real_to_target
2532 will put it into an array of *host* longs, 32 bits per element
2533 (even if long is more than 32 bits). We need to determine the
2534 number of array elements that are occupied (nelts) and the number
2535 of *target* min-addressable units that will be occupied in the
2536 object file (nunits). We cannot assume that 32 divides the
2537 mode's bitsize (size * BITS_PER_UNIT) evenly.
2539 size * BITS_PER_UNIT is used here to make sure that padding bits
2540 (which might appear at either end of the value; real_to_target
2541 will include the padding bits in its output array) are included. */
2543 nunits
= GET_MODE_SIZE (mode
);
2544 bitsize
= nunits
* BITS_PER_UNIT
;
2545 nelts
= CEIL (bitsize
, 32);
2546 units_per
= 32 / BITS_PER_UNIT
;
2548 real_to_target (data
, &d
, mode
);
2550 /* Put out the first word with the specified alignment. */
2551 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2552 nunits
-= units_per
;
2554 /* Subsequent words need only 32-bit alignment. */
2555 align
= min_align (align
, 32);
2557 for (i
= 1; i
< nelts
; i
++)
2559 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2560 nunits
-= units_per
;
2564 /* Given an expression EXP with a constant value,
2565 reduce it to the sum of an assembler symbol and an integer.
2566 Store them both in the structure *VALUE.
2567 EXP must be reducible. */
2571 HOST_WIDE_INT offset
;
2575 decode_addr_const (tree exp
, struct addr_const
*value
)
2577 tree target
= TREE_OPERAND (exp
, 0);
2583 if (TREE_CODE (target
) == COMPONENT_REF
2584 && host_integerp (byte_position (TREE_OPERAND (target
, 1)), 0))
2586 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2587 target
= TREE_OPERAND (target
, 0);
2589 else if (TREE_CODE (target
) == ARRAY_REF
2590 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2592 offset
+= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target
)), 1)
2593 * tree_low_cst (TREE_OPERAND (target
, 1), 0));
2594 target
= TREE_OPERAND (target
, 0);
2596 else if (TREE_CODE (target
) == MEM_REF
2597 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2599 offset
+= mem_ref_offset (target
).low
;
2600 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2602 else if (TREE_CODE (target
) == INDIRECT_REF
2603 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2604 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2606 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2611 switch (TREE_CODE (target
))
2615 x
= DECL_RTL (target
);
2619 x
= gen_rtx_MEM (FUNCTION_MODE
,
2620 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2629 x
= output_constant_def (target
, 1);
2636 gcc_assert (MEM_P (x
));
2640 value
->offset
= offset
;
2644 static GTY((param_is (struct constant_descriptor_tree
)))
2645 htab_t const_desc_htab
;
2647 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2649 /* Constant pool accessor function. */
2652 constant_pool_htab (void)
2654 return const_desc_htab
;
2657 /* Compute a hash code for a constant expression. */
2660 const_desc_hash (const void *ptr
)
2662 return ((const struct constant_descriptor_tree
*)ptr
)->hash
;
2666 const_hash_1 (const tree exp
)
2671 enum tree_code code
= TREE_CODE (exp
);
2673 /* Either set P and LEN to the address and len of something to hash and
2674 exit the switch or return a value. */
2679 p
= (char *) &TREE_INT_CST (exp
);
2680 len
= sizeof TREE_INT_CST (exp
);
2684 return real_hash (TREE_REAL_CST_PTR (exp
));
2687 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2690 p
= TREE_STRING_POINTER (exp
);
2691 len
= TREE_STRING_LENGTH (exp
);
2695 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2696 + const_hash_1 (TREE_IMAGPART (exp
)));
2702 hi
= 7 + VECTOR_CST_NELTS (exp
);
2704 for (i
= 0; i
< VECTOR_CST_NELTS (exp
); ++i
)
2705 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ELT (exp
, i
));
2712 unsigned HOST_WIDE_INT idx
;
2715 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2717 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2719 hi
= hi
* 603 + const_hash_1 (value
);
2727 struct addr_const value
;
2729 decode_addr_const (exp
, &value
);
2730 switch (GET_CODE (value
.base
))
2733 /* Don't hash the address of the SYMBOL_REF;
2734 only use the offset and the symbol name. */
2736 p
= XSTR (value
.base
, 0);
2737 for (i
= 0; p
[i
] != 0; i
++)
2738 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2742 hi
= value
.offset
+ CODE_LABEL_NUMBER (XEXP (value
.base
, 0)) * 13;
2752 case POINTER_PLUS_EXPR
:
2754 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2755 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2758 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2761 /* A language specific constant. Just hash the code. */
2765 /* Compute hashing function. */
2767 for (i
= 0; i
< len
; i
++)
2768 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2773 /* Wrapper of compare_constant, for the htab interface. */
2775 const_desc_eq (const void *p1
, const void *p2
)
2777 const struct constant_descriptor_tree
*const c1
2778 = (const struct constant_descriptor_tree
*) p1
;
2779 const struct constant_descriptor_tree
*const c2
2780 = (const struct constant_descriptor_tree
*) p2
;
2781 if (c1
->hash
!= c2
->hash
)
2783 return compare_constant (c1
->value
, c2
->value
);
2786 /* Compare t1 and t2, and return 1 only if they are known to result in
2787 the same bit pattern on output. */
2790 compare_constant (const tree t1
, const tree t2
)
2792 enum tree_code typecode
;
2794 if (t1
== NULL_TREE
)
2795 return t2
== NULL_TREE
;
2796 if (t2
== NULL_TREE
)
2799 if (TREE_CODE (t1
) != TREE_CODE (t2
))
2802 switch (TREE_CODE (t1
))
2805 /* Integer constants are the same only if the same width of type. */
2806 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2808 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2810 return tree_int_cst_equal (t1
, t2
);
2813 /* Real constants are the same only if the same width of type. */
2814 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2817 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
2820 /* Fixed constants are the same only if the same width of type. */
2821 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2824 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
2827 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2830 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
2831 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
2832 TREE_STRING_LENGTH (t1
)));
2835 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
2836 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
2842 if (VECTOR_CST_NELTS (t1
) != VECTOR_CST_NELTS (t2
))
2845 for (i
= 0; i
< VECTOR_CST_NELTS (t1
); ++i
)
2846 if (!compare_constant (VECTOR_CST_ELT (t1
, i
),
2847 VECTOR_CST_ELT (t2
, i
)))
2855 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
2856 unsigned HOST_WIDE_INT idx
;
2858 typecode
= TREE_CODE (TREE_TYPE (t1
));
2859 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
2862 if (typecode
== ARRAY_TYPE
)
2864 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
2865 /* For arrays, check that the sizes all match. */
2866 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
2868 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
2873 /* For record and union constructors, require exact type
2875 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
2879 v1
= CONSTRUCTOR_ELTS (t1
);
2880 v2
= CONSTRUCTOR_ELTS (t2
);
2881 if (vec_safe_length (v1
) != vec_safe_length (v2
))
2884 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
2886 constructor_elt
*c1
= &(*v1
)[idx
];
2887 constructor_elt
*c2
= &(*v2
)[idx
];
2889 /* Check that each value is the same... */
2890 if (!compare_constant (c1
->value
, c2
->value
))
2892 /* ... and that they apply to the same fields! */
2893 if (typecode
== ARRAY_TYPE
)
2895 if (!compare_constant (c1
->index
, c2
->index
))
2900 if (c1
->index
!= c2
->index
)
2911 struct addr_const value1
, value2
;
2915 decode_addr_const (t1
, &value1
);
2916 decode_addr_const (t2
, &value2
);
2918 if (value1
.offset
!= value2
.offset
)
2921 code
= GET_CODE (value1
.base
);
2922 if (code
!= GET_CODE (value2
.base
))
2928 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
2932 ret
= (CODE_LABEL_NUMBER (XEXP (value1
.base
, 0))
2933 == CODE_LABEL_NUMBER (XEXP (value2
.base
, 0)));
2943 case POINTER_PLUS_EXPR
:
2946 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
2947 && compare_constant(TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
2950 case VIEW_CONVERT_EXPR
:
2951 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
2960 /* Make a copy of the whole tree structure for a constant. This
2961 handles the same types of nodes that compare_constant handles. */
2964 copy_constant (tree exp
)
2966 switch (TREE_CODE (exp
))
2969 /* For ADDR_EXPR, we do not want to copy the decl whose address
2970 is requested. We do want to copy constants though. */
2971 if (CONSTANT_CLASS_P (TREE_OPERAND (exp
, 0)))
2972 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
2973 copy_constant (TREE_OPERAND (exp
, 0)));
2975 return copy_node (exp
);
2981 return copy_node (exp
);
2984 return build_complex (TREE_TYPE (exp
),
2985 copy_constant (TREE_REALPART (exp
)),
2986 copy_constant (TREE_IMAGPART (exp
)));
2989 case POINTER_PLUS_EXPR
:
2991 return build2 (TREE_CODE (exp
), TREE_TYPE (exp
),
2992 copy_constant (TREE_OPERAND (exp
, 0)),
2993 copy_constant (TREE_OPERAND (exp
, 1)));
2996 case VIEW_CONVERT_EXPR
:
2997 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
2998 copy_constant (TREE_OPERAND (exp
, 0)));
3001 return build_vector (TREE_TYPE (exp
), VECTOR_CST_ELTS (exp
));
3005 tree copy
= copy_node (exp
);
3006 vec
<constructor_elt
, va_gc
> *v
;
3007 unsigned HOST_WIDE_INT idx
;
3008 tree purpose
, value
;
3010 vec_alloc (v
, vec_safe_length (CONSTRUCTOR_ELTS (exp
)));
3011 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp
), idx
, purpose
, value
)
3013 constructor_elt ce
= {purpose
, copy_constant (value
)};
3016 CONSTRUCTOR_ELTS (copy
) = v
;
3025 /* Return the section into which constant EXP should be placed. */
3028 get_constant_section (tree exp
, unsigned int align
)
3030 return targetm
.asm_out
.select_section (exp
,
3031 compute_reloc_for_constant (exp
),
3035 /* Return the size of constant EXP in bytes. */
3037 static HOST_WIDE_INT
3038 get_constant_size (tree exp
)
3042 size
= int_size_in_bytes (TREE_TYPE (exp
));
3043 if (TREE_CODE (exp
) == STRING_CST
)
3044 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3048 /* Subroutine of output_constant_def:
3049 No constant equal to EXP is known to have been output.
3050 Make a constant descriptor to enter EXP in the hash table.
3051 Assign the label number and construct RTL to refer to the
3052 constant's location in memory.
3053 Caller is responsible for updating the hash table. */
3055 static struct constant_descriptor_tree
*
3056 build_constant_desc (tree exp
)
3058 struct constant_descriptor_tree
*desc
;
3064 desc
= ggc_alloc_constant_descriptor_tree ();
3065 desc
->value
= copy_constant (exp
);
3067 /* Propagate marked-ness to copied constant. */
3068 if (flag_mudflap
&& mf_marked_p (exp
))
3069 mf_mark (desc
->value
);
3071 /* Create a string containing the label name, in LABEL. */
3072 labelno
= const_labelno
++;
3073 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3075 /* Construct the VAR_DECL associated with the constant. */
3076 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3078 DECL_ARTIFICIAL (decl
) = 1;
3079 DECL_IGNORED_P (decl
) = 1;
3080 TREE_READONLY (decl
) = 1;
3081 TREE_STATIC (decl
) = 1;
3082 TREE_ADDRESSABLE (decl
) = 1;
3083 /* We don't set the RTL yet as this would cause varpool to assume that the
3084 variable is referenced. Moreover, it would just be dropped in LTO mode.
3085 Instead we set the flag that will be recognized in make_decl_rtl. */
3086 DECL_IN_CONSTANT_POOL (decl
) = 1;
3087 DECL_INITIAL (decl
) = desc
->value
;
3088 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3089 architectures so use DATA_ALIGNMENT as well, except for strings. */
3090 if (TREE_CODE (exp
) == STRING_CST
)
3092 #ifdef CONSTANT_ALIGNMENT
3093 DECL_ALIGN (decl
) = CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
));
3097 align_variable (decl
, 0);
3099 /* Now construct the SYMBOL_REF and the MEM. */
3100 if (use_object_blocks_p ())
3102 section
*sect
= get_constant_section (exp
, DECL_ALIGN (decl
));
3103 symbol
= create_block_symbol (ggc_strdup (label
),
3104 get_block_for_section (sect
), -1);
3107 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3108 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3109 SET_SYMBOL_REF_DECL (symbol
, decl
);
3110 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3112 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3113 set_mem_attributes (rtl
, exp
, 1);
3114 set_mem_alias_set (rtl
, 0);
3115 set_mem_alias_set (rtl
, const_alias_set
);
3117 /* We cannot share RTX'es in pool entries.
3118 Mark this piece of RTL as required for unsharing. */
3119 RTX_FLAG (rtl
, used
) = 1;
3121 /* Set flags or add text to the name to record information, such as
3122 that it is a local symbol. If the name is changed, the macro
3123 ASM_OUTPUT_LABELREF will have to know how to strip this
3124 information. This call might invalidate our local variable
3125 SYMBOL; we can't use it afterward. */
3126 targetm
.encode_section_info (exp
, rtl
, true);
3133 /* Return an rtx representing a reference to constant data in memory
3134 for the constant expression EXP.
3136 If assembler code for such a constant has already been output,
3137 return an rtx to refer to it.
3138 Otherwise, output such a constant in memory
3139 and generate an rtx for it.
3141 If DEFER is nonzero, this constant can be deferred and output only
3142 if referenced in the function after all optimizations.
3144 `const_desc_table' records which constants already have label strings. */
3147 output_constant_def (tree exp
, int defer
)
3149 struct constant_descriptor_tree
*desc
;
3150 struct constant_descriptor_tree key
;
3153 /* Look up EXP in the table of constant descriptors. If we didn't find
3154 it, create a new one. */
3156 key
.hash
= const_hash_1 (exp
);
3157 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3159 desc
= (struct constant_descriptor_tree
*) *loc
;
3162 desc
= build_constant_desc (exp
);
3163 desc
->hash
= key
.hash
;
3167 maybe_output_constant_def_contents (desc
, defer
);
3171 /* Subroutine of output_constant_def: Decide whether or not we need to
3172 output the constant DESC now, and if so, do it. */
3174 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3177 rtx symbol
= XEXP (desc
->rtl
, 0);
3178 tree exp
= desc
->value
;
3180 if (flag_syntax_only
)
3183 if (TREE_ASM_WRITTEN (exp
))
3184 /* Already output; don't do it again. */
3187 /* We can always defer constants as long as the context allows
3191 /* Increment n_deferred_constants if it exists. It needs to be at
3192 least as large as the number of constants actually referred to
3193 by the function. If it's too small we'll stop looking too early
3194 and fail to emit constants; if it's too large we'll only look
3195 through the entire function when we could have stopped earlier. */
3197 n_deferred_constants
++;
3201 output_constant_def_contents (symbol
);
3204 /* Subroutine of output_constant_def_contents. Output the definition
3205 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3206 constant's alignment in bits. */
3209 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3213 size
= get_constant_size (exp
);
3215 /* Do any machine/system dependent processing of the constant. */
3216 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3218 /* Output the value of EXP. */
3219 output_constant (exp
, size
, align
);
3222 /* We must output the constant data referred to by SYMBOL; do so. */
3225 output_constant_def_contents (rtx symbol
)
3227 tree decl
= SYMBOL_REF_DECL (symbol
);
3228 tree exp
= DECL_INITIAL (decl
);
3230 bool asan_protected
= false;
3232 /* Make sure any other constants whose addresses appear in EXP
3233 are assigned label numbers. */
3234 output_addressed_constants (exp
);
3236 /* We are no longer deferring this constant. */
3237 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3239 if (flag_asan
&& TREE_CODE (exp
) == STRING_CST
3240 && asan_protect_global (exp
))
3242 asan_protected
= true;
3243 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
3244 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
3247 /* If the constant is part of an object block, make sure that the
3248 decl has been positioned within its block, but do not write out
3249 its definition yet. output_object_blocks will do that later. */
3250 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3251 place_block_symbol (symbol
);
3254 align
= DECL_ALIGN (decl
);
3255 switch_to_section (get_constant_section (exp
, align
));
3256 if (align
> BITS_PER_UNIT
)
3257 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3258 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3261 HOST_WIDE_INT size
= get_constant_size (exp
);
3262 assemble_zeros (asan_red_zone_size (size
));
3266 mudflap_enqueue_constant (exp
);
3269 /* Look up EXP in the table of constant descriptors. Return the rtl
3270 if it has been emitted, else null. */
3273 lookup_constant_def (tree exp
)
3275 struct constant_descriptor_tree
*desc
;
3276 struct constant_descriptor_tree key
;
3279 key
.hash
= const_hash_1 (exp
);
3280 desc
= (struct constant_descriptor_tree
*)
3281 htab_find_with_hash (const_desc_htab
, &key
, key
.hash
);
3283 return (desc
? desc
->rtl
: NULL_RTX
);
3286 /* Return a tree representing a reference to constant data in memory
3287 for the constant expression EXP.
3289 This is the counterpart of output_constant_def at the Tree level. */
3292 tree_output_constant_def (tree exp
)
3294 struct constant_descriptor_tree
*desc
, key
;
3298 /* Look up EXP in the table of constant descriptors. If we didn't find
3299 it, create a new one. */
3301 key
.hash
= const_hash_1 (exp
);
3302 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3304 desc
= (struct constant_descriptor_tree
*) *loc
;
3307 desc
= build_constant_desc (exp
);
3308 desc
->hash
= key
.hash
;
3312 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3313 varpool_finalize_decl (decl
);
3317 /* Used in the hash tables to avoid outputting the same constant
3318 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3319 are output once per function, not once per file. */
3320 /* ??? Only a few targets need per-function constant pools. Most
3321 can use one per-file pool. Should add a targetm bit to tell the
3324 struct GTY(()) rtx_constant_pool
{
3325 /* Pointers to first and last constant in pool, as ordered by offset. */
3326 struct constant_descriptor_rtx
*first
;
3327 struct constant_descriptor_rtx
*last
;
3329 /* Hash facility for making memory-constants from constant rtl-expressions.
3330 It is used on RISC machines where immediate integer arguments and
3331 constant addresses are restricted so that such constants must be stored
3333 htab_t
GTY((param_is (struct constant_descriptor_rtx
))) const_rtx_htab
;
3335 /* Current offset in constant pool (does not include any
3336 machine-specific header). */
3337 HOST_WIDE_INT offset
;
3340 struct GTY((chain_next ("%h.next"))) constant_descriptor_rtx
{
3341 struct constant_descriptor_rtx
*next
;
3345 HOST_WIDE_INT offset
;
3347 enum machine_mode mode
;
3353 /* Hash and compare functions for const_rtx_htab. */
3356 const_desc_rtx_hash (const void *ptr
)
3358 const struct constant_descriptor_rtx
*const desc
3359 = (const struct constant_descriptor_rtx
*) ptr
;
3364 const_desc_rtx_eq (const void *a
, const void *b
)
3366 const struct constant_descriptor_rtx
*const x
3367 = (const struct constant_descriptor_rtx
*) a
;
3368 const struct constant_descriptor_rtx
*const y
3369 = (const struct constant_descriptor_rtx
*) b
;
3371 if (x
->mode
!= y
->mode
)
3373 return rtx_equal_p (x
->constant
, y
->constant
);
3376 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3379 const_rtx_hash_1 (rtx
*xp
, void *data
)
3381 unsigned HOST_WIDE_INT hwi
;
3382 enum machine_mode mode
;
3388 code
= GET_CODE (x
);
3389 mode
= GET_MODE (x
);
3390 h
= (hashval_t
) code
* 1048573 + mode
;
3398 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3399 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3402 h
^= (hashval_t
) hwi
;
3403 for (i
= 1; i
< n
; ++i
)
3406 h
^= (hashval_t
) hwi
;
3412 if (mode
== VOIDmode
)
3414 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3418 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3422 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3428 for (i
= XVECLEN (x
, 0); i
-- > 0; )
3429 h
= h
* 251 + const_rtx_hash_1 (&XVECEXP (x
, 0, i
), data
);
3434 h
^= htab_hash_string (XSTR (x
, 0));
3438 h
= h
* 251 + CODE_LABEL_NUMBER (XEXP (x
, 0));
3442 case UNSPEC_VOLATILE
:
3443 h
= h
* 251 + XINT (x
, 1);
3450 hp
= (hashval_t
*) data
;
3451 *hp
= *hp
* 509 + h
;
3455 /* Compute a hash value for X, which should be a constant. */
3458 const_rtx_hash (rtx x
)
3461 for_each_rtx (&x
, const_rtx_hash_1
, &h
);
3466 /* Create and return a new rtx constant pool. */
3468 static struct rtx_constant_pool
*
3469 create_constant_pool (void)
3471 struct rtx_constant_pool
*pool
;
3473 pool
= ggc_alloc_rtx_constant_pool ();
3474 pool
->const_rtx_htab
= htab_create_ggc (31, const_desc_rtx_hash
,
3475 const_desc_rtx_eq
, NULL
);
3482 /* Initialize constant pool hashing for a new function. */
3485 init_varasm_status (void)
3487 crtl
->varasm
.pool
= create_constant_pool ();
3488 crtl
->varasm
.deferred_constants
= 0;
3491 /* Given a MINUS expression, simplify it if both sides
3492 include the same symbol. */
3495 simplify_subtraction (rtx x
)
3497 rtx r
= simplify_rtx (x
);
3501 /* Given a constant rtx X, make (or find) a memory constant for its value
3502 and return a MEM rtx to refer to it in memory. */
3505 force_const_mem (enum machine_mode mode
, rtx x
)
3507 struct constant_descriptor_rtx
*desc
, tmp
;
3508 struct rtx_constant_pool
*pool
;
3515 /* If we're not allowed to drop X into the constant pool, don't. */
3516 if (targetm
.cannot_force_const_mem (mode
, x
))
3519 /* Record that this function has used a constant pool entry. */
3520 crtl
->uses_const_pool
= 1;
3522 /* Decide which pool to use. */
3523 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3524 ? shared_constant_pool
3525 : crtl
->varasm
.pool
);
3527 /* Lookup the value in the hashtable. */
3530 hash
= const_rtx_hash (x
);
3531 slot
= htab_find_slot_with_hash (pool
->const_rtx_htab
, &tmp
, hash
, INSERT
);
3532 desc
= (struct constant_descriptor_rtx
*) *slot
;
3534 /* If the constant was already present, return its memory. */
3536 return copy_rtx (desc
->mem
);
3538 /* Otherwise, create a new descriptor. */
3539 desc
= ggc_alloc_constant_descriptor_rtx ();
3542 /* Align the location counter as required by EXP's data type. */
3543 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3544 #ifdef CONSTANT_ALIGNMENT
3546 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3547 if (type
!= NULL_TREE
)
3548 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3552 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3553 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3556 desc
->constant
= copy_rtx (tmp
.constant
);
3557 desc
->offset
= pool
->offset
;
3560 desc
->align
= align
;
3561 desc
->labelno
= const_labelno
;
3564 pool
->offset
+= GET_MODE_SIZE (mode
);
3566 pool
->last
->next
= desc
;
3568 pool
->first
= pool
->last
= desc
;
3571 /* Create a string containing the label name, in LABEL. */
3572 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3575 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3576 the constants pool. */
3577 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3579 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3580 symbol
= create_block_symbol (ggc_strdup (label
),
3581 get_block_for_section (sect
), -1);
3584 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3586 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3587 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3588 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3590 /* Construct the MEM. */
3591 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3592 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3593 set_mem_align (def
, align
);
3595 /* If we're dropping a label to the constant pool, make sure we
3597 if (GET_CODE (x
) == LABEL_REF
)
3598 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3600 return copy_rtx (def
);
3603 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3606 get_pool_constant (rtx addr
)
3608 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3611 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3612 and whether it has been output or not. */
3615 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3617 struct constant_descriptor_rtx
*desc
;
3619 desc
= SYMBOL_REF_CONSTANT (addr
);
3620 *pmarked
= (desc
->mark
!= 0);
3621 return desc
->constant
;
3624 /* Similar, return the mode. */
3627 get_pool_mode (const_rtx addr
)
3629 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3632 /* Return the size of the constant pool. */
3635 get_pool_size (void)
3637 return crtl
->varasm
.pool
->offset
;
3640 /* Worker function for output_constant_pool_1. Emit assembly for X
3641 in MODE with known alignment ALIGN. */
3644 output_constant_pool_2 (enum machine_mode mode
, rtx x
, unsigned int align
)
3646 switch (GET_MODE_CLASS (mode
))
3649 case MODE_DECIMAL_FLOAT
:
3653 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3654 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3655 assemble_real (r
, mode
, align
);
3660 case MODE_PARTIAL_INT
:
3665 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3668 case MODE_VECTOR_FLOAT
:
3669 case MODE_VECTOR_INT
:
3670 case MODE_VECTOR_FRACT
:
3671 case MODE_VECTOR_UFRACT
:
3672 case MODE_VECTOR_ACCUM
:
3673 case MODE_VECTOR_UACCUM
:
3676 enum machine_mode submode
= GET_MODE_INNER (mode
);
3677 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3679 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3680 units
= CONST_VECTOR_NUNITS (x
);
3682 for (i
= 0; i
< units
; i
++)
3684 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3685 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3695 /* Worker function for output_constant_pool. Emit constant DESC,
3696 giving it ALIGN bits of alignment. */
3699 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3706 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3707 whose CODE_LABEL has been deleted. This can occur if a jump table
3708 is eliminated by optimization. If so, write a constant of zero
3709 instead. Note that this can also happen by turning the
3710 CODE_LABEL into a NOTE. */
3711 /* ??? This seems completely and utterly wrong. Certainly it's
3712 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3713 functioning even with INSN_DELETED_P and friends. */
3716 switch (GET_CODE (tmp
))
3719 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3720 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3722 tmp
= XEXP (XEXP (tmp
, 0), 0);
3726 tmp
= XEXP (tmp
, 0);
3727 gcc_assert (!INSN_DELETED_P (tmp
));
3728 gcc_assert (!NOTE_P (tmp
)
3729 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3736 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3737 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3738 align
, desc
->labelno
, done
);
3741 assemble_align (align
);
3743 /* Output the label. */
3744 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3746 /* Output the data. */
3747 output_constant_pool_2 (desc
->mode
, x
, align
);
3749 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3750 sections have proper size. */
3751 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3753 && (in_section
->common
.flags
& SECTION_MERGE
))
3754 assemble_align (align
);
3756 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3762 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3763 to as used. Emit referenced deferred strings. This function can
3764 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3767 mark_constant (rtx
*current_rtx
, void *data ATTRIBUTE_UNUSED
)
3769 rtx x
= *current_rtx
;
3771 if (x
== NULL_RTX
|| GET_CODE (x
) != SYMBOL_REF
)
3774 if (CONSTANT_POOL_ADDRESS_P (x
))
3776 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3777 if (desc
->mark
== 0)
3780 for_each_rtx (&desc
->constant
, mark_constant
, NULL
);
3783 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3785 tree decl
= SYMBOL_REF_DECL (x
);
3786 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
3788 n_deferred_constants
--;
3789 output_constant_def_contents (x
);
3796 /* Look through appropriate parts of INSN, marking all entries in the
3797 constant pool which are actually being used. Entries that are only
3798 referenced by other constants are also marked as used. Emit
3799 deferred strings that are used. */
3802 mark_constants (rtx insn
)
3807 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3808 insns, not any notes that may be attached. We don't want to mark
3809 a constant just because it happens to appear in a REG_EQUIV note. */
3810 if (GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3812 rtx seq
= PATTERN (insn
);
3813 int i
, n
= XVECLEN (seq
, 0);
3814 for (i
= 0; i
< n
; ++i
)
3816 rtx subinsn
= XVECEXP (seq
, 0, i
);
3817 if (INSN_P (subinsn
))
3818 for_each_rtx (&PATTERN (subinsn
), mark_constant
, NULL
);
3822 for_each_rtx (&PATTERN (insn
), mark_constant
, NULL
);
3825 /* Look through the instructions for this function, and mark all the
3826 entries in POOL which are actually being used. Emit deferred constants
3827 which have indeed been used. */
3830 mark_constant_pool (void)
3834 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
3837 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3838 mark_constants (insn
);
3841 /* Write all the constants in POOL. */
3844 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
3846 struct constant_descriptor_rtx
*desc
;
3848 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3851 /* If the constant is part of an object_block, make sure that
3852 the constant has been positioned within its block, but do not
3853 write out its definition yet. output_object_blocks will do
3855 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
3856 && SYMBOL_REF_BLOCK (desc
->sym
))
3857 place_block_symbol (desc
->sym
);
3860 switch_to_section (targetm
.asm_out
.select_rtx_section
3861 (desc
->mode
, desc
->constant
, desc
->align
));
3862 output_constant_pool_1 (desc
, desc
->align
);
3867 /* Mark all constants that are used in the current function, then write
3868 out the function's private constant pool. */
3871 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
3872 tree fndecl ATTRIBUTE_UNUSED
)
3874 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
3876 /* It is possible for gcc to call force_const_mem and then to later
3877 discard the instructions which refer to the constant. In such a
3878 case we do not need to output the constant. */
3879 mark_constant_pool ();
3881 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3882 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3885 output_constant_pool_contents (pool
);
3887 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3888 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3892 /* Write the contents of the shared constant pool. */
3895 output_shared_constant_pool (void)
3897 output_constant_pool_contents (shared_constant_pool
);
3900 /* Determine what kind of relocations EXP may need. */
3903 compute_reloc_for_constant (tree exp
)
3905 int reloc
= 0, reloc2
;
3908 switch (TREE_CODE (exp
))
3912 /* Go inside any operations that get_inner_reference can handle and see
3913 if what's inside is a constant: no need to do anything here for
3914 addresses of variables or functions. */
3915 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3916 tem
= TREE_OPERAND (tem
, 0))
3919 if (TREE_CODE (tem
) == MEM_REF
3920 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
3922 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
3926 if (TREE_PUBLIC (tem
))
3933 case POINTER_PLUS_EXPR
:
3934 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3935 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3939 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3940 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3941 /* The difference of two local labels is computable at link time. */
3942 if (reloc
== 1 && reloc2
== 1)
3949 case VIEW_CONVERT_EXPR
:
3950 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3955 unsigned HOST_WIDE_INT idx
;
3956 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
3958 reloc
|= compute_reloc_for_constant (tem
);
3968 /* Find all the constants whose addresses are referenced inside of EXP,
3969 and make sure assembler code with a label has been output for each one.
3970 Indicate whether an ADDR_EXPR has been encountered. */
3973 output_addressed_constants (tree exp
)
3977 switch (TREE_CODE (exp
))
3981 /* Go inside any operations that get_inner_reference can handle and see
3982 if what's inside is a constant: no need to do anything here for
3983 addresses of variables or functions. */
3984 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3985 tem
= TREE_OPERAND (tem
, 0))
3988 /* If we have an initialized CONST_DECL, retrieve the initializer. */
3989 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
3990 tem
= DECL_INITIAL (tem
);
3992 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
3993 output_constant_def (tem
, 0);
3995 if (TREE_CODE (tem
) == MEM_REF
)
3996 output_addressed_constants (TREE_OPERAND (tem
, 0));
4000 case POINTER_PLUS_EXPR
:
4002 output_addressed_constants (TREE_OPERAND (exp
, 1));
4006 case VIEW_CONVERT_EXPR
:
4007 output_addressed_constants (TREE_OPERAND (exp
, 0));
4012 unsigned HOST_WIDE_INT idx
;
4013 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4015 output_addressed_constants (tem
);
4024 /* Whether a constructor CTOR is a valid static constant initializer if all
4025 its elements are. This used to be internal to initializer_constant_valid_p
4026 and has been exposed to let other functions like categorize_ctor_elements
4027 evaluate the property while walking a constructor for other purposes. */
4030 constructor_static_from_elts_p (const_tree ctor
)
4032 return (TREE_CONSTANT (ctor
)
4033 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4034 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4035 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4038 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4041 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4042 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4043 which are valid when ENDTYPE is an integer of any size; in
4044 particular, this does not accept a pointer minus a constant. This
4045 returns null_pointer_node if the VALUE is an absolute constant
4046 which can be used to initialize a static variable. Otherwise it
4050 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4054 if (!INTEGRAL_TYPE_P (endtype
))
4057 op0
= TREE_OPERAND (value
, 0);
4058 op1
= TREE_OPERAND (value
, 1);
4060 /* Like STRIP_NOPS except allow the operand mode to widen. This
4061 works around a feature of fold that simplifies (int)(p1 - p2) to
4062 ((int)p1 - (int)p2) under the theory that the narrower operation
4065 while (CONVERT_EXPR_P (op0
)
4066 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4068 tree inner
= TREE_OPERAND (op0
, 0);
4069 if (inner
== error_mark_node
4070 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4071 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4072 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4077 while (CONVERT_EXPR_P (op1
)
4078 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4080 tree inner
= TREE_OPERAND (op1
, 0);
4081 if (inner
== error_mark_node
4082 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4083 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4084 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4089 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4093 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4094 cache
? cache
+ 2 : NULL
);
4095 /* Both initializers must be known. */
4099 && (op0
== null_pointer_node
4100 || TREE_CODE (value
) == MINUS_EXPR
))
4101 return null_pointer_node
;
4103 /* Support differences between labels. */
4104 if (TREE_CODE (op0
) == LABEL_DECL
4105 && TREE_CODE (op1
) == LABEL_DECL
)
4106 return null_pointer_node
;
4108 if (TREE_CODE (op0
) == STRING_CST
4109 && TREE_CODE (op1
) == STRING_CST
4110 && operand_equal_p (op0
, op1
, 1))
4111 return null_pointer_node
;
4117 /* Helper function of initializer_constant_valid_p.
4118 Return nonzero if VALUE is a valid constant-valued expression
4119 for use in initializing a static variable; one that can be an
4120 element of a "constant" initializer.
4122 Return null_pointer_node if the value is absolute;
4123 if it is relocatable, return the variable that determines the relocation.
4124 We assume that VALUE has been folded as much as possible;
4125 therefore, we do not need to check for such things as
4126 arithmetic-combinations of integers.
4128 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4131 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4135 switch (TREE_CODE (value
))
4138 if (constructor_static_from_elts_p (value
))
4140 unsigned HOST_WIDE_INT idx
;
4142 bool absolute
= true;
4144 if (cache
&& cache
[0] == value
)
4146 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4149 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4156 cache
[1] = NULL_TREE
;
4160 if (reloc
!= null_pointer_node
)
4163 /* For a non-absolute relocation, there is no single
4164 variable that can be "the variable that determines the
4169 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4171 return absolute
? null_pointer_node
: error_mark_node
;
4174 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4182 return null_pointer_node
;
4187 tree op0
= staticp (TREE_OPERAND (value
, 0));
4190 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4191 to be a constant, this is old-skool offsetof-like nonsense. */
4192 if (TREE_CODE (op0
) == INDIRECT_REF
4193 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4194 return null_pointer_node
;
4195 /* Taking the address of a nested function involves a trampoline,
4196 unless we don't need or want one. */
4197 if (TREE_CODE (op0
) == FUNCTION_DECL
4198 && DECL_STATIC_CHAIN (op0
)
4199 && !TREE_NO_TRAMPOLINE (value
))
4201 /* "&{...}" requires a temporary to hold the constructed
4203 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4209 case NON_LVALUE_EXPR
:
4210 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4213 case VIEW_CONVERT_EXPR
:
4215 tree src
= TREE_OPERAND (value
, 0);
4216 tree src_type
= TREE_TYPE (src
);
4217 tree dest_type
= TREE_TYPE (value
);
4219 /* Allow view-conversions from aggregate to non-aggregate type only
4220 if the bit pattern is fully preserved afterwards; otherwise, the
4221 RTL expander won't be able to apply a subsequent transformation
4222 to the underlying constructor. */
4223 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4225 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4226 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4231 /* Allow all other kinds of view-conversion. */
4232 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4237 tree src
= TREE_OPERAND (value
, 0);
4238 tree src_type
= TREE_TYPE (src
);
4239 tree dest_type
= TREE_TYPE (value
);
4241 /* Allow conversions between pointer types, floating-point
4242 types, and offset types. */
4243 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4244 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4245 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4246 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4247 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4249 /* Allow length-preserving conversions between integer types. */
4250 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4251 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4252 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4254 /* Allow conversions between other integer types only if
4256 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4258 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4259 if (inner
== null_pointer_node
)
4260 return null_pointer_node
;
4264 /* Allow (int) &foo provided int is as wide as a pointer. */
4265 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4266 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4267 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4269 /* Likewise conversions from int to pointers, but also allow
4270 conversions from 0. */
4271 if ((POINTER_TYPE_P (dest_type
)
4272 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4273 && INTEGRAL_TYPE_P (src_type
))
4275 if (TREE_CODE (src
) == INTEGER_CST
4276 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4277 return null_pointer_node
;
4278 if (integer_zerop (src
))
4279 return null_pointer_node
;
4280 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4281 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4284 /* Allow conversions to struct or union types if the value
4286 if (TREE_CODE (dest_type
) == RECORD_TYPE
4287 || TREE_CODE (dest_type
) == UNION_TYPE
)
4288 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4292 case POINTER_PLUS_EXPR
:
4294 /* Any valid floating-point constants will have been folded by now;
4295 with -frounding-math we hit this with addition of two constants. */
4296 if (TREE_CODE (endtype
) == REAL_TYPE
)
4298 if (cache
&& cache
[0] == value
)
4300 if (! INTEGRAL_TYPE_P (endtype
)
4301 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4303 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4305 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4308 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4309 endtype
, ncache
+ 2);
4310 /* If either term is absolute, use the other term's relocation. */
4311 if (valid0
== null_pointer_node
)
4313 else if (valid1
== null_pointer_node
)
4315 /* Support narrowing pointer differences. */
4317 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4321 /* Support narrowing pointer differences. */
4322 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4331 if (TREE_CODE (endtype
) == REAL_TYPE
)
4333 if (cache
&& cache
[0] == value
)
4335 if (! INTEGRAL_TYPE_P (endtype
)
4336 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4338 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4340 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4343 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4344 endtype
, ncache
+ 2);
4345 /* Win if second argument is absolute. */
4346 if (valid1
== null_pointer_node
)
4348 /* Win if both arguments have the same relocation.
4349 Then the value is absolute. */
4350 else if (valid0
== valid1
&& valid0
!= 0)
4351 ret
= null_pointer_node
;
4352 /* Since GCC guarantees that string constants are unique in the
4353 generated code, a subtraction between two copies of the same
4354 constant string is absolute. */
4355 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4356 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4357 && operand_equal_p (valid0
, valid1
, 1))
4358 ret
= null_pointer_node
;
4359 /* Support narrowing differences. */
4361 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4365 /* Support narrowing differences. */
4366 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4381 /* Return nonzero if VALUE is a valid constant-valued expression
4382 for use in initializing a static variable; one that can be an
4383 element of a "constant" initializer.
4385 Return null_pointer_node if the value is absolute;
4386 if it is relocatable, return the variable that determines the relocation.
4387 We assume that VALUE has been folded as much as possible;
4388 therefore, we do not need to check for such things as
4389 arithmetic-combinations of integers. */
4391 initializer_constant_valid_p (tree value
, tree endtype
)
4393 return initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4396 /* Return true if VALUE is a valid constant-valued expression
4397 for use in initializing a static bit-field; one that can be
4398 an element of a "constant" initializer. */
4401 initializer_constant_valid_for_bitfield_p (tree value
)
4403 /* For bitfields we support integer constants or possibly nested aggregates
4405 switch (TREE_CODE (value
))
4409 unsigned HOST_WIDE_INT idx
;
4412 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4413 if (!initializer_constant_valid_for_bitfield_p (elt
))
4422 case VIEW_CONVERT_EXPR
:
4423 case NON_LVALUE_EXPR
:
4425 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4434 /* output_constructor outer state of relevance in recursive calls, typically
4435 for nested aggregate bitfields. */
4438 unsigned int bit_offset
; /* current position in ... */
4439 int byte
; /* ... the outer byte buffer. */
4442 static unsigned HOST_WIDE_INT
4443 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int,
4446 /* Output assembler code for constant EXP to FILE, with no label.
4447 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4448 Assumes output_addressed_constants has been done on EXP already.
4450 Generate exactly SIZE bytes of assembler data, padding at the end
4451 with zeros if necessary. SIZE must always be specified.
4453 SIZE is important for structure constructors,
4454 since trailing members may have been omitted from the constructor.
4455 It is also important for initialization of arrays from string constants
4456 since the full length of the string constant might not be wanted.
4457 It is also needed for initialization of unions, where the initializer's
4458 type is just one member, and that may not be as long as the union.
4460 There a case in which we would fail to output exactly SIZE bytes:
4461 for a structure constructor that wants to produce more than SIZE bytes.
4462 But such constructors will never be generated for any possible input.
4464 ALIGN is the alignment of the data in bits. */
4467 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4469 enum tree_code code
;
4470 unsigned HOST_WIDE_INT thissize
;
4472 if (size
== 0 || flag_syntax_only
)
4475 /* See if we're trying to initialize a pointer in a non-default mode
4476 to the address of some declaration somewhere. If the target says
4477 the mode is valid for pointers, assume the target has a way of
4479 if (TREE_CODE (exp
) == NOP_EXPR
4480 && POINTER_TYPE_P (TREE_TYPE (exp
))
4481 && targetm
.addr_space
.valid_pointer_mode
4482 (TYPE_MODE (TREE_TYPE (exp
)),
4483 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4485 tree saved_type
= TREE_TYPE (exp
);
4487 /* Peel off any intermediate conversions-to-pointer for valid
4489 while (TREE_CODE (exp
) == NOP_EXPR
4490 && POINTER_TYPE_P (TREE_TYPE (exp
))
4491 && targetm
.addr_space
.valid_pointer_mode
4492 (TYPE_MODE (TREE_TYPE (exp
)),
4493 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4494 exp
= TREE_OPERAND (exp
, 0);
4496 /* If what we're left with is the address of something, we can
4497 convert the address to the final type and output it that
4499 if (TREE_CODE (exp
) == ADDR_EXPR
)
4500 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4501 /* Likewise for constant ints. */
4502 else if (TREE_CODE (exp
) == INTEGER_CST
)
4503 exp
= build_int_cst_wide (saved_type
, TREE_INT_CST_LOW (exp
),
4504 TREE_INT_CST_HIGH (exp
));
4508 /* Eliminate any conversions since we'll be outputting the underlying
4510 while (CONVERT_EXPR_P (exp
)
4511 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4512 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4514 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4515 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4517 /* Make sure eliminating the conversion is really a no-op, except with
4518 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4519 union types to allow for Ada unchecked unions. */
4520 if (type_size
> op_size
4521 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4522 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4523 /* Keep the conversion. */
4526 exp
= TREE_OPERAND (exp
, 0);
4529 code
= TREE_CODE (TREE_TYPE (exp
));
4530 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4532 /* Allow a constructor with no elements for any data type.
4533 This means to fill the space with zeros. */
4534 if (TREE_CODE (exp
) == CONSTRUCTOR
4535 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4537 assemble_zeros (size
);
4541 if (TREE_CODE (exp
) == FDESC_EXPR
)
4543 #ifdef ASM_OUTPUT_FDESC
4544 HOST_WIDE_INT part
= tree_low_cst (TREE_OPERAND (exp
, 1), 0);
4545 tree decl
= TREE_OPERAND (exp
, 0);
4546 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4553 /* Now output the underlying data. If we've handling the padding, return.
4554 Otherwise, break and ensure SIZE is the size written. */
4561 case REFERENCE_TYPE
:
4563 case FIXED_POINT_TYPE
:
4564 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4565 EXPAND_INITIALIZER
),
4566 MIN (size
, thissize
), align
, 0))
4567 error ("initializer for integer/fixed-point value is too complicated");
4571 if (TREE_CODE (exp
) != REAL_CST
)
4572 error ("initializer for floating value is not a floating constant");
4574 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4578 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4579 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4580 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4585 switch (TREE_CODE (exp
))
4588 output_constructor (exp
, size
, align
, NULL
);
4592 = MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
), size
);
4593 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4597 enum machine_mode inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4598 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4599 int elt_size
= GET_MODE_SIZE (inner
);
4600 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
);
4601 thissize
= elt_size
;
4602 for (unsigned int i
= 1; i
< VECTOR_CST_NELTS (exp
); i
++)
4604 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
);
4605 thissize
+= elt_size
;
4616 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4617 output_constructor (exp
, size
, align
, NULL
);
4627 if (size
> thissize
)
4628 assemble_zeros (size
- thissize
);
4632 /* Subroutine of output_constructor, used for computing the size of
4633 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4634 type with an unspecified upper bound. */
4636 static unsigned HOST_WIDE_INT
4637 array_size_for_constructor (tree val
)
4640 unsigned HOST_WIDE_INT cnt
;
4641 tree index
, value
, tmp
;
4644 /* This code used to attempt to handle string constants that are not
4645 arrays of single-bytes, but nothing else does, so there's no point in
4647 if (TREE_CODE (val
) == STRING_CST
)
4648 return TREE_STRING_LENGTH (val
);
4650 max_index
= NULL_TREE
;
4651 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4653 if (TREE_CODE (index
) == RANGE_EXPR
)
4654 index
= TREE_OPERAND (index
, 1);
4655 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4659 if (max_index
== NULL_TREE
)
4662 /* Compute the total number of array elements. */
4663 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4664 i
= tree_to_double_int (max_index
) - tree_to_double_int (tmp
);
4665 i
+= double_int_one
;
4667 /* Multiply by the array element unit size to find number of bytes. */
4668 i
*= tree_to_double_int (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4670 gcc_assert (i
.fits_uhwi ());
4674 /* Other datastructures + helpers for output_constructor. */
4676 /* output_constructor local state to support interaction with helpers. */
4680 /* Received arguments. */
4681 tree exp
; /* Constructor expression. */
4682 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4683 unsigned int align
; /* Known initial alignment. */
4685 /* Constructor expression data. */
4686 tree type
; /* Expression type. */
4687 tree field
; /* Current field decl in a record. */
4688 tree min_index
; /* Lower bound if specified for an array. */
4690 /* Output processing state. */
4691 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4692 bool byte_buffer_in_use
; /* Whether byte ... */
4693 int byte
; /* ... contains part of a bitfield byte yet to
4696 int last_relative_index
; /* Implicit or explicit index of the last
4697 array element output within a bitfield. */
4698 /* Current element. */
4699 tree val
; /* Current element value. */
4700 tree index
; /* Current element index. */
4704 /* Helper for output_constructor. From the current LOCAL state, output a
4705 RANGE_EXPR element. */
4708 output_constructor_array_range (oc_local_state
*local
)
4710 unsigned HOST_WIDE_INT fieldsize
4711 = int_size_in_bytes (TREE_TYPE (local
->type
));
4713 HOST_WIDE_INT lo_index
4714 = tree_low_cst (TREE_OPERAND (local
->index
, 0), 0);
4715 HOST_WIDE_INT hi_index
4716 = tree_low_cst (TREE_OPERAND (local
->index
, 1), 0);
4717 HOST_WIDE_INT index
;
4720 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4722 for (index
= lo_index
; index
<= hi_index
; index
++)
4724 /* Output the element's initial value. */
4725 if (local
->val
== NULL_TREE
)
4726 assemble_zeros (fieldsize
);
4728 output_constant (local
->val
, fieldsize
, align2
);
4730 /* Count its size. */
4731 local
->total_bytes
+= fieldsize
;
4735 /* Helper for output_constructor. From the current LOCAL state, output a
4736 field element that is not true bitfield or part of an outer one. */
4739 output_constructor_regular_field (oc_local_state
*local
)
4741 /* Field size and position. Since this structure is static, we know the
4742 positions are constant. */
4743 unsigned HOST_WIDE_INT fieldsize
;
4744 HOST_WIDE_INT fieldpos
;
4746 unsigned int align2
;
4748 if (local
->index
!= NULL_TREE
)
4750 /* Perform the index calculation in modulo arithmetic but
4751 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4752 but we are using an unsigned sizetype. */
4753 unsigned prec
= TYPE_PRECISION (sizetype
);
4754 double_int idx
= tree_to_double_int (local
->index
)
4755 - tree_to_double_int (local
->min_index
);
4756 idx
= idx
.sext (prec
);
4757 fieldpos
= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
)), 1)
4760 else if (local
->field
!= NULL_TREE
)
4761 fieldpos
= int_byte_position (local
->field
);
4765 /* Output any buffered-up bit-fields preceding this element. */
4766 if (local
->byte_buffer_in_use
)
4768 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4769 local
->total_bytes
++;
4770 local
->byte_buffer_in_use
= false;
4773 /* Advance to offset of this element.
4774 Note no alignment needed in an array, since that is guaranteed
4775 if each element has the proper size. */
4776 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4777 && fieldpos
!= local
->total_bytes
)
4779 gcc_assert (fieldpos
>= local
->total_bytes
);
4780 assemble_zeros (fieldpos
- local
->total_bytes
);
4781 local
->total_bytes
= fieldpos
;
4784 /* Find the alignment of this element. */
4785 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
4787 /* Determine size this element should occupy. */
4792 /* If this is an array with an unspecified upper bound,
4793 the initializer determines the size. */
4794 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4795 but we cannot do this until the deprecated support for
4796 initializing zero-length array members is removed. */
4797 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
4798 && TYPE_DOMAIN (TREE_TYPE (local
->field
))
4799 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
))))
4801 fieldsize
= array_size_for_constructor (local
->val
);
4802 /* Given a non-empty initialization, this field had
4804 gcc_assert (!fieldsize
|| !DECL_CHAIN (local
->field
));
4807 fieldsize
= tree_low_cst (DECL_SIZE_UNIT (local
->field
), 1);
4810 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
4812 /* Output the element's initial value. */
4813 if (local
->val
== NULL_TREE
)
4814 assemble_zeros (fieldsize
);
4816 output_constant (local
->val
, fieldsize
, align2
);
4818 /* Count its size. */
4819 local
->total_bytes
+= fieldsize
;
4822 /* Helper for output_constructor. From the current LOCAL and OUTER states,
4823 output an element that is a true bitfield or part of an outer one. */
4826 output_constructor_bitfield (oc_local_state
*local
, oc_outer_state
*outer
)
4828 /* Bit size of this element. */
4829 HOST_WIDE_INT ebitsize
4831 ? tree_low_cst (DECL_SIZE (local
->field
), 1)
4832 : tree_low_cst (TYPE_SIZE (TREE_TYPE (local
->type
)), 1));
4834 /* Relative index of this element if this is an array component. */
4835 HOST_WIDE_INT relative_index
4838 ? (tree_low_cst (local
->index
, 0)
4839 - tree_low_cst (local
->min_index
, 0))
4840 : local
->last_relative_index
+ 1)
4843 /* Bit position of this element from the start of the containing
4845 HOST_WIDE_INT constructor_relative_ebitpos
4847 ? int_bit_position (local
->field
)
4848 : ebitsize
* relative_index
);
4850 /* Bit position of this element from the start of a possibly ongoing
4851 outer byte buffer. */
4852 HOST_WIDE_INT byte_relative_ebitpos
4853 = ((outer
? outer
->bit_offset
: 0) + constructor_relative_ebitpos
);
4855 /* From the start of a possibly ongoing outer byte buffer, offsets to
4856 the first bit of this element and to the first bit past the end of
4858 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
4859 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
4861 local
->last_relative_index
= relative_index
;
4863 if (local
->val
== NULL_TREE
)
4864 local
->val
= integer_zero_node
;
4866 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
4867 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
4868 local
->val
= TREE_OPERAND (local
->val
, 0);
4870 if (TREE_CODE (local
->val
) != INTEGER_CST
4871 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
4873 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
4877 /* If this field does not start in this (or, next) byte,
4879 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4881 /* Output remnant of any bit field in previous bytes. */
4882 if (local
->byte_buffer_in_use
)
4884 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4885 local
->total_bytes
++;
4886 local
->byte_buffer_in_use
= false;
4889 /* If still not at proper byte, advance to there. */
4890 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4892 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
4893 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
4894 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
4898 /* Set up the buffer if necessary. */
4899 if (!local
->byte_buffer_in_use
)
4903 local
->byte_buffer_in_use
= true;
4906 /* If this is nested constructor, recurse passing the bit offset and the
4907 pending data, then retrieve the new pending data afterwards. */
4908 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
4910 oc_outer_state output_state
;
4912 output_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
4913 output_state
.byte
= local
->byte
;
4915 += output_constructor (local
->val
, 0, 0, &output_state
);
4916 local
->byte
= output_state
.byte
;
4920 /* Otherwise, we must split the element into pieces that fall within
4921 separate bytes, and combine each byte with previous or following
4923 while (next_offset
< end_offset
)
4927 HOST_WIDE_INT value
;
4928 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
4929 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
4931 /* Advance from byte to byte
4932 within this element when necessary. */
4933 while (next_byte
!= local
->total_bytes
)
4935 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4936 local
->total_bytes
++;
4940 /* Number of bits we can process at once
4941 (all part of the same byte). */
4942 this_time
= MIN (end_offset
- next_offset
,
4943 BITS_PER_UNIT
- next_bit
);
4944 if (BYTES_BIG_ENDIAN
)
4946 /* On big-endian machine, take the most significant bits
4947 first (of the bits that are significant)
4948 and put them into bytes from the most significant end. */
4949 shift
= end_offset
- next_offset
- this_time
;
4951 /* Don't try to take a bunch of bits that cross
4952 the word boundary in the INTEGER_CST. We can
4953 only select bits from the LOW or HIGH part
4955 if (shift
< HOST_BITS_PER_WIDE_INT
4956 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4958 this_time
= shift
+ this_time
- HOST_BITS_PER_WIDE_INT
;
4959 shift
= HOST_BITS_PER_WIDE_INT
;
4962 /* Now get the bits from the appropriate constant word. */
4963 if (shift
< HOST_BITS_PER_WIDE_INT
)
4964 value
= TREE_INT_CST_LOW (local
->val
);
4967 gcc_assert (shift
< HOST_BITS_PER_DOUBLE_INT
);
4968 value
= TREE_INT_CST_HIGH (local
->val
);
4969 shift
-= HOST_BITS_PER_WIDE_INT
;
4972 /* Get the result. This works only when:
4973 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4974 local
->byte
|= (((value
>> shift
)
4975 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
4976 << (BITS_PER_UNIT
- this_time
- next_bit
));
4980 /* On little-endian machines,
4981 take first the least significant bits of the value
4982 and pack them starting at the least significant
4983 bits of the bytes. */
4984 shift
= next_offset
- byte_relative_ebitpos
;
4986 /* Don't try to take a bunch of bits that cross
4987 the word boundary in the INTEGER_CST. We can
4988 only select bits from the LOW or HIGH part
4990 if (shift
< HOST_BITS_PER_WIDE_INT
4991 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4992 this_time
= (HOST_BITS_PER_WIDE_INT
- shift
);
4994 /* Now get the bits from the appropriate constant word. */
4995 if (shift
< HOST_BITS_PER_WIDE_INT
)
4996 value
= TREE_INT_CST_LOW (local
->val
);
4999 gcc_assert (shift
< HOST_BITS_PER_DOUBLE_INT
);
5000 value
= TREE_INT_CST_HIGH (local
->val
);
5001 shift
-= HOST_BITS_PER_WIDE_INT
;
5004 /* Get the result. This works only when:
5005 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5006 local
->byte
|= (((value
>> shift
)
5007 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5011 next_offset
+= this_time
;
5012 local
->byte_buffer_in_use
= true;
5016 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5017 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5018 caller output state of relevance in recursive invocations. */
5020 static unsigned HOST_WIDE_INT
5021 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
5022 unsigned int align
, oc_outer_state
* outer
)
5024 unsigned HOST_WIDE_INT cnt
;
5025 constructor_elt
*ce
;
5027 oc_local_state local
;
5029 /* Setup our local state to communicate with helpers. */
5032 local
.align
= align
;
5034 local
.total_bytes
= 0;
5035 local
.byte_buffer_in_use
= outer
!= NULL
;
5036 local
.byte
= outer
? outer
->byte
: 0;
5038 local
.type
= TREE_TYPE (exp
);
5040 local
.last_relative_index
= -1;
5042 local
.min_index
= NULL_TREE
;
5043 if (TREE_CODE (local
.type
) == ARRAY_TYPE
5044 && TYPE_DOMAIN (local
.type
) != NULL_TREE
)
5045 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5047 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5049 /* As CE goes through the elements of the constant, FIELD goes through the
5050 structure fields if the constant is a structure. If the constant is a
5051 union, we override this by getting the field from the TREE_LIST element.
5052 But the constant could also be an array. Then FIELD is zero.
5054 There is always a maximum of one element in the chain LINK for unions
5055 (even if the initializer in a source program incorrectly contains
5058 local
.field
= NULL_TREE
;
5059 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5060 local
.field
= TYPE_FIELDS (local
.type
);
5063 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5064 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5066 local
.val
= ce
->value
;
5067 local
.index
= NULL_TREE
;
5069 /* The element in a union constructor specifies the proper field
5071 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5072 local
.field
= ce
->index
;
5074 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5075 local
.index
= ce
->index
;
5077 if (local
.field
&& flag_verbose_asm
)
5078 fprintf (asm_out_file
, "%s %s:\n",
5080 DECL_NAME (local
.field
)
5081 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5084 /* Eliminate the marker that makes a cast not be an lvalue. */
5085 if (local
.val
!= NULL_TREE
)
5086 STRIP_NOPS (local
.val
);
5088 /* Output the current element, using the appropriate helper ... */
5090 /* For an array slice not part of an outer bitfield. */
5092 && local
.index
!= NULL_TREE
5093 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5094 output_constructor_array_range (&local
);
5096 /* For a field that is neither a true bitfield nor part of an outer one,
5097 known to be at least byte aligned and multiple-of-bytes long. */
5099 && (local
.field
== NULL_TREE
5100 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5101 output_constructor_regular_field (&local
);
5103 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5104 supported for scalar fields, so we may need to convert first. */
5107 if (TREE_CODE (local
.val
) == REAL_CST
)
5109 = fold_unary (VIEW_CONVERT_EXPR
,
5110 build_nonstandard_integer_type
5111 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5113 output_constructor_bitfield (&local
, outer
);
5117 /* If we are not at toplevel, save the pending data for our caller.
5118 Otherwise output the pending data and padding zeros as needed. */
5120 outer
->byte
= local
.byte
;
5123 if (local
.byte_buffer_in_use
)
5125 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5126 local
.total_bytes
++;
5129 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5131 assemble_zeros (local
.size
- local
.total_bytes
);
5132 local
.total_bytes
= local
.size
;
5136 return local
.total_bytes
;
5139 /* Mark DECL as weak. */
5142 mark_weak (tree decl
)
5144 DECL_WEAK (decl
) = 1;
5146 if (DECL_RTL_SET_P (decl
)
5147 && MEM_P (DECL_RTL (decl
))
5148 && XEXP (DECL_RTL (decl
), 0)
5149 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5150 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5153 /* Merge weak status between NEWDECL and OLDDECL. */
5156 merge_weak (tree newdecl
, tree olddecl
)
5158 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5160 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5163 /* We put the NEWDECL on the weak_decls list at some point
5164 and OLDDECL as well. Keep just OLDDECL on the list. */
5165 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5166 if (TREE_VALUE (*pwd
) == newdecl
)
5168 *pwd
= TREE_CHAIN (*pwd
);
5175 if (DECL_WEAK (newdecl
))
5179 /* NEWDECL is weak, but OLDDECL is not. */
5181 /* If we already output the OLDDECL, we're in trouble; we can't
5182 go back and make it weak. This should never happen in
5183 unit-at-a-time compilation. */
5184 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5186 /* If we've already generated rtl referencing OLDDECL, we may
5187 have done so in a way that will not function properly with
5188 a weak symbol. Again in unit-at-a-time this should be
5190 gcc_assert (!TREE_USED (olddecl
)
5191 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5193 if (TARGET_SUPPORTS_WEAK
)
5195 /* We put the NEWDECL on the weak_decls list at some point.
5196 Replace it with the OLDDECL. */
5197 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5198 if (TREE_VALUE (wd
) == newdecl
)
5200 TREE_VALUE (wd
) = olddecl
;
5203 /* We may not find the entry on the list. If NEWDECL is a
5204 weak alias, then we will have already called
5205 globalize_decl to remove the entry; in that case, we do
5206 not need to do anything. */
5209 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5210 mark_weak (olddecl
);
5213 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5214 weak. Just update NEWDECL to indicate that it's weak too. */
5215 mark_weak (newdecl
);
5218 /* Declare DECL to be a weak symbol. */
5221 declare_weak (tree decl
)
5223 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5224 if (! TREE_PUBLIC (decl
))
5225 error ("weak declaration of %q+D must be public", decl
);
5226 else if (!TARGET_SUPPORTS_WEAK
)
5227 warning (0, "weak declaration of %q+D not supported", decl
);
5230 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5231 DECL_ATTRIBUTES (decl
)
5232 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5236 weak_finish_1 (tree decl
)
5238 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5239 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5242 if (! TREE_USED (decl
))
5245 #ifdef ASM_WEAKEN_DECL
5246 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5248 #ifdef ASM_WEAKEN_LABEL
5249 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5251 #ifdef ASM_OUTPUT_WEAK_ALIAS
5253 static bool warn_once
= 0;
5256 warning (0, "only weak aliases are supported in this configuration");
5266 /* Fiven an assembly name, find the decl it is associated with. */
5268 find_decl (tree target
)
5270 symtab_node node
= symtab_node_for_asm (target
);
5272 return node
->symbol
.decl
;
5276 /* This TREE_LIST contains weakref targets. */
5278 static GTY(()) tree weakref_targets
;
5280 /* Emit any pending weak declarations. */
5287 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5289 tree alias_decl
= TREE_PURPOSE (t
);
5290 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5292 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5293 /* Remove alias_decl from the weak list, but leave entries for
5294 the target alone. */
5296 #ifndef ASM_OUTPUT_WEAKREF
5297 else if (! TREE_SYMBOL_REFERENCED (target
))
5299 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5300 defined, otherwise we and weak_finish_1 would use
5301 different macros. */
5302 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5303 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5305 tree decl
= find_decl (target
);
5309 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5310 TREE_CODE (alias_decl
), target
,
5311 TREE_TYPE (alias_decl
));
5313 DECL_EXTERNAL (decl
) = 1;
5314 TREE_PUBLIC (decl
) = 1;
5315 DECL_ARTIFICIAL (decl
) = 1;
5316 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5317 TREE_USED (decl
) = 1;
5320 weak_finish_1 (decl
);
5329 /* Remove the alias and the target from the pending weak list
5330 so that we do not emit any .weak directives for the former,
5331 nor multiple .weak directives for the latter. */
5332 for (p
= &weak_decls
; (t2
= *p
) ; )
5334 if (TREE_VALUE (t2
) == alias_decl
5335 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5336 *p
= TREE_CHAIN (t2
);
5338 p
= &TREE_CHAIN (t2
);
5341 /* Remove other weakrefs to the same target, to speed things up. */
5342 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5344 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5345 *p
= TREE_CHAIN (t2
);
5347 p
= &TREE_CHAIN (t2
);
5352 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5354 tree decl
= TREE_VALUE (t
);
5356 weak_finish_1 (decl
);
5360 /* Emit the assembly bits to indicate that DECL is globally visible. */
5363 globalize_decl (tree decl
)
5366 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5367 if (DECL_WEAK (decl
))
5369 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5372 #ifdef ASM_WEAKEN_DECL
5373 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5375 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5378 /* Remove this function from the pending weak list so that
5379 we do not emit multiple .weak directives for it. */
5380 for (p
= &weak_decls
; (t
= *p
) ; )
5382 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5383 *p
= TREE_CHAIN (t
);
5385 p
= &TREE_CHAIN (t
);
5388 /* Remove weakrefs to the same target from the pending weakref
5389 list, for the same reason. */
5390 for (p
= &weakref_targets
; (t
= *p
) ; )
5392 if (DECL_ASSEMBLER_NAME (decl
)
5393 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5394 *p
= TREE_CHAIN (t
);
5396 p
= &TREE_CHAIN (t
);
5403 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5406 vec
<alias_pair
, va_gc
> *alias_pairs
;
5408 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5409 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5410 tree node is DECL to have the value of the tree node TARGET. */
5413 do_assemble_alias (tree decl
, tree target
)
5415 /* Emulated TLS had better not get this var. */
5416 gcc_assert(!(!targetm
.have_tls
5417 && TREE_CODE (decl
) == VAR_DECL
5418 && DECL_THREAD_LOCAL_P (decl
)));
5420 if (TREE_ASM_WRITTEN (decl
))
5423 /* We must force creation of DECL_RTL for debug info generation, even though
5424 we don't use it here. */
5425 make_decl_rtl (decl
);
5427 TREE_ASM_WRITTEN (decl
) = 1;
5428 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5430 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5432 ultimate_transparent_alias_target (&target
);
5434 if (!TREE_SYMBOL_REFERENCED (target
))
5435 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5437 #ifdef ASM_OUTPUT_WEAKREF
5438 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5439 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5440 IDENTIFIER_POINTER (target
));
5442 if (!TARGET_SUPPORTS_WEAK
)
5444 error_at (DECL_SOURCE_LOCATION (decl
),
5445 "weakref is not supported in this configuration");
5452 #ifdef ASM_OUTPUT_DEF
5453 /* Make name accessible from other files, if appropriate. */
5455 if (TREE_PUBLIC (decl
))
5457 globalize_decl (decl
);
5458 maybe_assemble_visibility (decl
);
5460 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5462 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5463 if (targetm
.has_ifunc_p ())
5464 ASM_OUTPUT_TYPE_DIRECTIVE
5465 (asm_out_file
, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5469 error_at (DECL_SOURCE_LOCATION (decl
),
5470 "ifunc is not supported on this target");
5473 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5474 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5476 ASM_OUTPUT_DEF (asm_out_file
,
5477 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5478 IDENTIFIER_POINTER (target
));
5480 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5485 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5486 # ifdef ASM_WEAKEN_DECL
5487 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5489 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5491 /* Remove this function from the pending weak list so that
5492 we do not emit multiple .weak directives for it. */
5493 for (p
= &weak_decls
; (t
= *p
) ; )
5494 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5495 *p
= TREE_CHAIN (t
);
5497 p
= &TREE_CHAIN (t
);
5499 /* Remove weakrefs to the same target from the pending weakref
5500 list, for the same reason. */
5501 for (p
= &weakref_targets
; (t
= *p
) ; )
5503 if (DECL_ASSEMBLER_NAME (decl
)
5504 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5505 *p
= TREE_CHAIN (t
);
5507 p
= &TREE_CHAIN (t
);
5513 /* Emit an assembler directive to make the symbol for DECL an alias to
5514 the symbol for TARGET. */
5517 assemble_alias (tree decl
, tree target
)
5521 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5523 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5525 ultimate_transparent_alias_target (&target
);
5527 if (alias
== target
)
5528 error ("weakref %q+D ultimately targets itself", decl
);
5529 if (TREE_PUBLIC (decl
))
5530 error ("weakref %q+D must have static linkage", decl
);
5534 #if !defined (ASM_OUTPUT_DEF)
5535 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5536 error_at (DECL_SOURCE_LOCATION (decl
),
5537 "alias definitions not supported in this configuration");
5540 if (!DECL_WEAK (decl
))
5542 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5543 error_at (DECL_SOURCE_LOCATION (decl
),
5544 "ifunc is not supported in this configuration");
5546 error_at (DECL_SOURCE_LOCATION (decl
),
5547 "only weak aliases are supported in this configuration");
5553 TREE_USED (decl
) = 1;
5555 /* Allow aliases to aliases. */
5556 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5557 cgraph_get_create_node (decl
)->symbol
.alias
= true;
5559 varpool_node_for_decl (decl
)->symbol
.alias
= true;
5561 /* If the target has already been emitted, we don't have to queue the
5562 alias. This saves a tad of memory. */
5563 if (cgraph_global_info_ready
)
5564 target_decl
= find_decl (target
);
5567 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5568 || cgraph_state
>= CGRAPH_STATE_EXPANSION
)
5569 do_assemble_alias (decl
, target
);
5572 alias_pair p
= {decl
, target
};
5573 vec_safe_push (alias_pairs
, p
);
5577 /* Record and output a table of translations from original function
5578 to its transaction aware clone. Note that tm_pure functions are
5579 considered to be their own clone. */
5581 static GTY((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
5582 htab_t tm_clone_hash
;
5585 record_tm_clone_pair (tree o
, tree n
)
5587 struct tree_map
**slot
, *h
;
5589 if (tm_clone_hash
== NULL
)
5590 tm_clone_hash
= htab_create_ggc (32, tree_map_hash
, tree_map_eq
, 0);
5592 h
= ggc_alloc_tree_map ();
5593 h
->hash
= htab_hash_pointer (o
);
5597 slot
= (struct tree_map
**)
5598 htab_find_slot_with_hash (tm_clone_hash
, h
, h
->hash
, INSERT
);
5603 get_tm_clone_pair (tree o
)
5607 struct tree_map
*h
, in
;
5610 in
.hash
= htab_hash_pointer (o
);
5611 h
= (struct tree_map
*) htab_find_with_hash (tm_clone_hash
,
5619 typedef struct tm_alias_pair
5627 /* Helper function for finish_tm_clone_pairs. Dump a hash table entry
5628 into a VEC in INFO. */
5631 dump_tm_clone_to_vec (void **slot
, void *info
)
5633 struct tree_map
*map
= (struct tree_map
*) *slot
;
5634 vec
<tm_alias_pair
> *tm_alias_pairs
= (vec
<tm_alias_pair
> *) info
;
5635 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5636 tm_alias_pairs
->safe_push (p
);
5640 /* Dump the actual pairs to the .tm_clone_table section. */
5643 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5647 bool switched
= false;
5649 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5653 struct cgraph_node
*src_n
= cgraph_get_node (src
);
5654 struct cgraph_node
*dst_n
= cgraph_get_node (dst
);
5656 /* The function ipa_tm_create_version() marks the clone as needed if
5657 the original function was needed. But we also mark the clone as
5658 needed if we ever called the clone indirectly through
5659 TM_GETTMCLONE. If neither of these are true, we didn't generate
5660 a clone, and we didn't call it indirectly... no sense keeping it
5661 in the clone table. */
5662 if (!dst_n
|| !dst_n
->symbol
.definition
)
5665 /* This covers the case where we have optimized the original
5666 function away, and only access the transactional clone. */
5667 if (!src_n
|| !src_n
->symbol
.definition
)
5672 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5673 assemble_align (POINTER_SIZE
);
5677 assemble_integer (XEXP (DECL_RTL (src
), 0),
5678 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5679 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5680 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5684 /* Provide a default for the tm_clone_table section. */
5687 default_clone_table_section (void)
5689 return get_named_section (NULL
, ".tm_clone_table", 3);
5692 /* Helper comparison function for qsorting by the DECL_UID stored in
5693 alias_pair->emitted_diags. */
5696 tm_alias_pair_cmp (const void *x
, const void *y
)
5698 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5699 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5700 if (p1
->uid
< p2
->uid
)
5702 if (p1
->uid
> p2
->uid
)
5708 finish_tm_clone_pairs (void)
5710 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5712 if (tm_clone_hash
== NULL
)
5715 /* We need a determenistic order for the .tm_clone_table, otherwise
5716 we will get bootstrap comparison failures, so dump the hash table
5717 to a vector, sort it, and dump the vector. */
5719 /* Dump the hashtable to a vector. */
5720 htab_traverse_noresize (tm_clone_hash
, dump_tm_clone_to_vec
,
5721 (void *) &tm_alias_pairs
);
5723 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5726 dump_tm_clone_pairs (tm_alias_pairs
);
5728 htab_delete (tm_clone_hash
);
5729 tm_clone_hash
= NULL
;
5730 tm_alias_pairs
.release ();
5734 /* Emit an assembler directive to set symbol for DECL visibility to
5735 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5738 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5739 int vis ATTRIBUTE_UNUSED
)
5741 #ifdef HAVE_GAS_HIDDEN
5742 static const char * const visibility_types
[] = {
5743 NULL
, "protected", "hidden", "internal"
5746 const char *name
, *type
;
5748 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5749 type
= visibility_types
[vis
];
5751 fprintf (asm_out_file
, "\t.%s\t", type
);
5752 assemble_name (asm_out_file
, name
);
5753 fprintf (asm_out_file
, "\n");
5755 if (!DECL_ARTIFICIAL (decl
))
5756 warning (OPT_Wattributes
, "visibility attribute not supported "
5757 "in this configuration; ignored");
5761 /* A helper function to call assemble_visibility when needed for a decl. */
5764 maybe_assemble_visibility (tree decl
)
5766 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5768 if (vis
!= VISIBILITY_DEFAULT
)
5770 targetm
.asm_out
.assemble_visibility (decl
, vis
);
5777 /* Returns 1 if the target configuration supports defining public symbols
5778 so that one of them will be chosen at link time instead of generating a
5779 multiply-defined symbol error, whether through the use of weak symbols or
5780 a target-specific mechanism for having duplicates discarded. */
5783 supports_one_only (void)
5785 if (SUPPORTS_ONE_ONLY
)
5787 return TARGET_SUPPORTS_WEAK
;
5790 /* Set up DECL as a public symbol that can be defined in multiple
5791 translation units without generating a linker error. */
5794 make_decl_one_only (tree decl
, tree comdat_group
)
5796 gcc_assert (TREE_CODE (decl
) == VAR_DECL
5797 || TREE_CODE (decl
) == FUNCTION_DECL
);
5799 TREE_PUBLIC (decl
) = 1;
5801 if (SUPPORTS_ONE_ONLY
)
5803 #ifdef MAKE_DECL_ONE_ONLY
5804 MAKE_DECL_ONE_ONLY (decl
);
5806 DECL_COMDAT_GROUP (decl
) = comdat_group
;
5808 else if (TREE_CODE (decl
) == VAR_DECL
5809 && (DECL_INITIAL (decl
) == 0 || DECL_INITIAL (decl
) == error_mark_node
))
5810 DECL_COMMON (decl
) = 1;
5813 gcc_assert (TARGET_SUPPORTS_WEAK
);
5814 DECL_WEAK (decl
) = 1;
5819 init_varasm_once (void)
5821 section_htab
= htab_create_ggc (31, section_entry_hash
,
5822 section_entry_eq
, NULL
);
5823 object_block_htab
= htab_create_ggc (31, object_block_entry_hash
,
5824 object_block_entry_eq
, NULL
);
5825 const_desc_htab
= htab_create_ggc (1009, const_desc_hash
,
5826 const_desc_eq
, NULL
);
5828 const_alias_set
= new_alias_set ();
5829 shared_constant_pool
= create_constant_pool ();
5831 #ifdef TEXT_SECTION_ASM_OP
5832 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
5833 TEXT_SECTION_ASM_OP
);
5836 #ifdef DATA_SECTION_ASM_OP
5837 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5838 DATA_SECTION_ASM_OP
);
5841 #ifdef SDATA_SECTION_ASM_OP
5842 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5843 SDATA_SECTION_ASM_OP
);
5846 #ifdef READONLY_DATA_SECTION_ASM_OP
5847 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
5848 READONLY_DATA_SECTION_ASM_OP
);
5851 #ifdef CTORS_SECTION_ASM_OP
5852 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
5853 CTORS_SECTION_ASM_OP
);
5856 #ifdef DTORS_SECTION_ASM_OP
5857 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
5858 DTORS_SECTION_ASM_OP
);
5861 #ifdef BSS_SECTION_ASM_OP
5862 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5863 output_section_asm_op
,
5864 BSS_SECTION_ASM_OP
);
5867 #ifdef SBSS_SECTION_ASM_OP
5868 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5869 output_section_asm_op
,
5870 SBSS_SECTION_ASM_OP
);
5873 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5874 | SECTION_COMMON
, emit_tls_common
);
5875 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5876 | SECTION_COMMON
, emit_local
);
5877 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5878 | SECTION_COMMON
, emit_common
);
5880 #if defined ASM_OUTPUT_ALIGNED_BSS
5881 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
5885 targetm
.asm_out
.init_sections ();
5887 if (readonly_data_section
== NULL
)
5888 readonly_data_section
= text_section
;
5890 #ifdef ASM_OUTPUT_EXTERNAL
5891 pending_assemble_externals_set
= pointer_set_create ();
5896 decl_default_tls_model (const_tree decl
)
5898 enum tls_model kind
;
5901 is_local
= targetm
.binds_local_p (decl
);
5905 kind
= TLS_MODEL_LOCAL_EXEC
;
5907 kind
= TLS_MODEL_INITIAL_EXEC
;
5910 /* Local dynamic is inefficient when we're not combining the
5911 parts of the address. */
5912 else if (optimize
&& is_local
)
5913 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
5915 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
5916 if (kind
< flag_tls_default
)
5917 kind
= flag_tls_default
;
5922 /* Select a set of attributes for section NAME based on the properties
5923 of DECL and whether or not RELOC indicates that DECL's initializer
5924 might contain runtime relocations.
5926 We make the section read-only and executable for a function decl,
5927 read-only for a const data decl, and writable for a non-const data decl. */
5930 default_section_type_flags (tree decl
, const char *name
, int reloc
)
5934 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
5935 flags
= SECTION_CODE
;
5938 enum section_category category
5939 = categorize_decl_for_section (decl
, reloc
);
5940 if (decl_readonly_section_1 (category
))
5942 else if (category
== SECCAT_DATA_REL_RO
5943 || category
== SECCAT_DATA_REL_RO_LOCAL
)
5944 flags
= SECTION_WRITE
| SECTION_RELRO
;
5946 flags
= SECTION_WRITE
;
5950 flags
= SECTION_WRITE
;
5951 if (strcmp (name
, ".data.rel.ro") == 0
5952 || strcmp (name
, ".data.rel.ro.local") == 0)
5953 flags
|= SECTION_RELRO
;
5956 if (decl
&& DECL_P (decl
) && DECL_ONE_ONLY (decl
))
5957 flags
|= SECTION_LINKONCE
;
5959 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
5960 flags
|= SECTION_TLS
| SECTION_WRITE
;
5962 if (strcmp (name
, ".bss") == 0
5963 || strncmp (name
, ".bss.", 5) == 0
5964 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
5965 || strcmp (name
, ".sbss") == 0
5966 || strncmp (name
, ".sbss.", 6) == 0
5967 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
5968 flags
|= SECTION_BSS
;
5970 if (strcmp (name
, ".tdata") == 0
5971 || strncmp (name
, ".tdata.", 7) == 0
5972 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
5973 flags
|= SECTION_TLS
;
5975 if (strcmp (name
, ".tbss") == 0
5976 || strncmp (name
, ".tbss.", 6) == 0
5977 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
5978 flags
|= SECTION_TLS
| SECTION_BSS
;
5980 /* These three sections have special ELF types. They are neither
5981 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
5982 want to print a section type (@progbits or @nobits). If someone
5983 is silly enough to emit code or TLS variables to one of these
5984 sections, then don't handle them specially. */
5985 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
5986 && (strcmp (name
, ".init_array") == 0
5987 || strcmp (name
, ".fini_array") == 0
5988 || strcmp (name
, ".preinit_array") == 0))
5989 flags
|= SECTION_NOTYPE
;
5994 /* Return true if the target supports some form of global BSS,
5995 either through bss_noswitch_section, or by selecting a BSS
5996 section in TARGET_ASM_SELECT_SECTION. */
5999 have_global_bss_p (void)
6001 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6004 /* Output assembly to switch to section NAME with attribute FLAGS.
6005 Four variants for common object file formats. */
6008 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6009 unsigned int flags ATTRIBUTE_UNUSED
,
6010 tree decl ATTRIBUTE_UNUSED
)
6012 /* Some object formats don't support named sections at all. The
6013 front-end should already have flagged this as an error. */
6017 #ifndef TLS_SECTION_ASM_FLAG
6018 #define TLS_SECTION_ASM_FLAG 'T'
6022 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6023 tree decl ATTRIBUTE_UNUSED
)
6025 char flagchars
[10], *f
= flagchars
;
6027 /* If we have already declared this section, we can use an
6028 abbreviated form to switch back to it -- unless this section is
6029 part of a COMDAT groups, in which case GAS requires the full
6030 declaration every time. */
6031 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6032 && (flags
& SECTION_DECLARED
))
6034 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6038 if (!(flags
& SECTION_DEBUG
))
6040 if (flags
& SECTION_EXCLUDE
)
6042 if (flags
& SECTION_WRITE
)
6044 if (flags
& SECTION_CODE
)
6046 if (flags
& SECTION_SMALL
)
6048 if (flags
& SECTION_MERGE
)
6050 if (flags
& SECTION_STRINGS
)
6052 if (flags
& SECTION_TLS
)
6053 *f
++ = TLS_SECTION_ASM_FLAG
;
6054 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6058 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6060 if (!(flags
& SECTION_NOTYPE
))
6065 if (flags
& SECTION_BSS
)
6071 /* On platforms that use "@" as the assembly comment character,
6073 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6075 fprintf (asm_out_file
, format
, type
);
6077 if (flags
& SECTION_ENTSIZE
)
6078 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6079 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6081 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6082 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6084 fprintf (asm_out_file
, ",%s,comdat",
6085 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6089 putc ('\n', asm_out_file
);
6093 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6094 tree decl ATTRIBUTE_UNUSED
)
6096 char flagchars
[8], *f
= flagchars
;
6098 if (flags
& SECTION_WRITE
)
6100 if (flags
& SECTION_CODE
)
6104 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6108 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6111 default_coff_asm_named_section (name
, flags
, decl
);
6113 if (flags
& SECTION_LINKONCE
)
6115 /* Functions may have been compiled at various levels of
6116 optimization so we can't use `same_size' here.
6117 Instead, have the linker pick one. */
6118 fprintf (asm_out_file
, "\t.linkonce %s\n",
6119 (flags
& SECTION_CODE
? "discard" : "same_size"));
6123 /* The lame default section selector. */
6126 default_select_section (tree decl
, int reloc
,
6127 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6131 if (decl_readonly_section (decl
, reloc
))
6132 return readonly_data_section
;
6134 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6136 if (! ((flag_pic
&& reloc
)
6137 || !TREE_READONLY (decl
)
6138 || TREE_SIDE_EFFECTS (decl
)
6139 || !TREE_CONSTANT (decl
)))
6140 return readonly_data_section
;
6142 else if (TREE_CODE (decl
) == STRING_CST
)
6143 return readonly_data_section
;
6144 else if (! (flag_pic
&& reloc
))
6145 return readonly_data_section
;
6147 return data_section
;
6150 enum section_category
6151 categorize_decl_for_section (const_tree decl
, int reloc
)
6153 enum section_category ret
;
6155 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6157 else if (TREE_CODE (decl
) == STRING_CST
)
6160 || (flag_asan
&& asan_protect_global (CONST_CAST_TREE (decl
))))
6161 /* or !flag_merge_constants */
6162 return SECCAT_RODATA
;
6164 return SECCAT_RODATA_MERGE_STR
;
6166 else if (TREE_CODE (decl
) == VAR_DECL
)
6168 if (bss_initializer_p (decl
))
6170 else if (! TREE_READONLY (decl
)
6171 || TREE_SIDE_EFFECTS (decl
)
6172 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6174 /* Here the reloc_rw_mask is not testing whether the section should
6175 be read-only or not, but whether the dynamic link will have to
6176 do something. If so, we wish to segregate the data in order to
6177 minimize cache misses inside the dynamic linker. */
6178 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6179 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6183 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6184 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6185 else if (reloc
|| flag_merge_constants
< 2 || flag_mudflap
6186 || (flag_asan
&& asan_protect_global (CONST_CAST_TREE (decl
))))
6187 /* C and C++ don't allow different variables to share the same
6188 location. -fmerge-all-constants allows even that (at the
6189 expense of not conforming). */
6190 ret
= SECCAT_RODATA
;
6191 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6192 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6194 ret
= SECCAT_RODATA_MERGE_CONST
;
6196 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6198 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6199 || TREE_SIDE_EFFECTS (decl
)
6200 || ! TREE_CONSTANT (decl
))
6203 ret
= SECCAT_RODATA
;
6206 ret
= SECCAT_RODATA
;
6208 /* There are no read-only thread-local sections. */
6209 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6211 /* Note that this would be *just* SECCAT_BSS, except that there's
6212 no concept of a read-only thread-local-data section. */
6213 if (ret
== SECCAT_BSS
6214 || (flag_zero_initialized_in_bss
6215 && initializer_zerop (DECL_INITIAL (decl
))))
6221 /* If the target uses small data sections, select it. */
6222 else if (targetm
.in_small_data_p (decl
))
6224 if (ret
== SECCAT_BSS
)
6226 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6227 ret
= SECCAT_SRODATA
;
6236 decl_readonly_section_1 (enum section_category category
)
6241 case SECCAT_RODATA_MERGE_STR
:
6242 case SECCAT_RODATA_MERGE_STR_INIT
:
6243 case SECCAT_RODATA_MERGE_CONST
:
6244 case SECCAT_SRODATA
:
6252 decl_readonly_section (const_tree decl
, int reloc
)
6254 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6257 /* Select a section based on the above categorization. */
6260 default_elf_select_section (tree decl
, int reloc
,
6261 unsigned HOST_WIDE_INT align
)
6264 switch (categorize_decl_for_section (decl
, reloc
))
6267 /* We're not supposed to be called on FUNCTION_DECLs. */
6270 return readonly_data_section
;
6271 case SECCAT_RODATA_MERGE_STR
:
6272 return mergeable_string_section (decl
, align
, 0);
6273 case SECCAT_RODATA_MERGE_STR_INIT
:
6274 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6275 case SECCAT_RODATA_MERGE_CONST
:
6276 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6277 case SECCAT_SRODATA
:
6281 return data_section
;
6282 case SECCAT_DATA_REL
:
6283 sname
= ".data.rel";
6285 case SECCAT_DATA_REL_LOCAL
:
6286 sname
= ".data.rel.local";
6288 case SECCAT_DATA_REL_RO
:
6289 sname
= ".data.rel.ro";
6291 case SECCAT_DATA_REL_RO_LOCAL
:
6292 sname
= ".data.rel.ro.local";
6315 return get_named_section (decl
, sname
, reloc
);
6318 /* Construct a unique section name based on the decl name and the
6319 categorization performed above. */
6322 default_unique_section (tree decl
, int reloc
)
6324 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6325 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6326 const char *prefix
, *name
, *linkonce
;
6329 switch (categorize_decl_for_section (decl
, reloc
))
6332 prefix
= one_only
? ".t" : ".text";
6335 case SECCAT_RODATA_MERGE_STR
:
6336 case SECCAT_RODATA_MERGE_STR_INIT
:
6337 case SECCAT_RODATA_MERGE_CONST
:
6338 prefix
= one_only
? ".r" : ".rodata";
6340 case SECCAT_SRODATA
:
6341 prefix
= one_only
? ".s2" : ".sdata2";
6344 prefix
= one_only
? ".d" : ".data";
6346 case SECCAT_DATA_REL
:
6347 prefix
= one_only
? ".d.rel" : ".data.rel";
6349 case SECCAT_DATA_REL_LOCAL
:
6350 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6352 case SECCAT_DATA_REL_RO
:
6353 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6355 case SECCAT_DATA_REL_RO_LOCAL
:
6356 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6359 prefix
= one_only
? ".s" : ".sdata";
6362 prefix
= one_only
? ".b" : ".bss";
6365 prefix
= one_only
? ".sb" : ".sbss";
6368 prefix
= one_only
? ".td" : ".tdata";
6371 prefix
= one_only
? ".tb" : ".tbss";
6377 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
6378 name
= targetm
.strip_name_encoding (name
);
6380 /* If we're using one_only, then there needs to be a .gnu.linkonce
6381 prefix to the section name. */
6382 linkonce
= one_only
? ".gnu.linkonce" : "";
6384 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6386 DECL_SECTION_NAME (decl
) = build_string (strlen (string
), string
);
6389 /* Like compute_reloc_for_constant, except for an RTX. The return value
6390 is a mask for which bit 1 indicates a global relocation, and bit 0
6391 indicates a local relocation. */
6394 compute_reloc_for_rtx_1 (rtx
*xp
, void *data
)
6396 int *preloc
= (int *) data
;
6399 switch (GET_CODE (x
))
6402 *preloc
|= SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6415 compute_reloc_for_rtx (rtx x
)
6419 switch (GET_CODE (x
))
6425 for_each_rtx (&x
, compute_reloc_for_rtx_1
, &reloc
);
6434 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
6436 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6438 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6439 return data_section
;
6441 return readonly_data_section
;
6445 default_elf_select_rtx_section (enum machine_mode mode
, rtx x
,
6446 unsigned HOST_WIDE_INT align
)
6448 int reloc
= compute_reloc_for_rtx (x
);
6450 /* ??? Handle small data here somehow. */
6452 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6455 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6457 return get_named_section (NULL
, ".data.rel.ro", 3);
6460 return mergeable_constant_section (mode
, align
, 0);
6463 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6466 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6471 /* Careful not to prod global register variables. */
6474 symbol
= XEXP (rtl
, 0);
6475 if (GET_CODE (symbol
) != SYMBOL_REF
)
6478 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6479 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6480 flags
|= SYMBOL_FLAG_FUNCTION
;
6481 if (targetm
.binds_local_p (decl
))
6482 flags
|= SYMBOL_FLAG_LOCAL
;
6483 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6484 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6485 else if (targetm
.in_small_data_p (decl
))
6486 flags
|= SYMBOL_FLAG_SMALL
;
6487 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6488 being PUBLIC, the thing *must* be defined in this translation unit.
6489 Prevent this buglet from being propagated into rtl code as well. */
6490 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6491 flags
|= SYMBOL_FLAG_EXTERNAL
;
6493 SYMBOL_REF_FLAGS (symbol
) = flags
;
6496 /* By default, we do nothing for encode_section_info, so we need not
6497 do anything but discard the '*' marker. */
6500 default_strip_name_encoding (const char *str
)
6502 return str
+ (*str
== '*');
6505 #ifdef ASM_OUTPUT_DEF
6506 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6507 anchor relative to ".", the current section position. */
6510 default_asm_output_anchor (rtx symbol
)
6514 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6515 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6516 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6520 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6523 default_use_anchors_for_symbol_p (const_rtx symbol
)
6528 /* Don't use anchors for mergeable sections. The linker might move
6529 the objects around. */
6530 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6531 if (sect
->common
.flags
& SECTION_MERGE
)
6534 /* Don't use anchors for small data sections. The small data register
6535 acts as an anchor for such sections. */
6536 if (sect
->common
.flags
& SECTION_SMALL
)
6539 decl
= SYMBOL_REF_DECL (symbol
);
6540 if (decl
&& DECL_P (decl
))
6542 /* Don't use section anchors for decls that might be defined or
6543 usurped by other modules. */
6544 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
6547 /* Don't use section anchors for decls that will be placed in a
6548 small data section. */
6549 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6550 one above. The problem is that we only use SECTION_SMALL for
6551 sections that should be marked as small in the section directive. */
6552 if (targetm
.in_small_data_p (decl
))
6558 /* Return true when RESOLUTION indicate that symbol will be bound to the
6559 definition provided by current .o file. */
6562 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6564 return (resolution
== LDPR_PREVAILING_DEF
6565 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6566 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6569 /* Return true when RESOLUTION indicate that symbol will be bound locally
6570 within current executable or DSO. */
6573 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6575 return (resolution
== LDPR_PREVAILING_DEF
6576 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6577 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6578 || resolution
== LDPR_PREEMPTED_REG
6579 || resolution
== LDPR_PREEMPTED_IR
6580 || resolution
== LDPR_RESOLVED_IR
6581 || resolution
== LDPR_RESOLVED_EXEC
);
6584 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6585 wrt cross-module name binding. */
6588 default_binds_local_p (const_tree exp
)
6590 return default_binds_local_p_1 (exp
, flag_shlib
);
6594 default_binds_local_p_1 (const_tree exp
, int shlib
)
6597 bool resolved_locally
= false;
6598 bool resolved_to_local_def
= false;
6600 /* With resolution file in hands, take look into resolutions.
6601 We can't just return true for resolved_locally symbols,
6602 because dynamic linking might overwrite symbols
6603 in shared libraries. */
6604 if (TREE_CODE (exp
) == VAR_DECL
&& TREE_PUBLIC (exp
)
6605 && (TREE_STATIC (exp
) || DECL_EXTERNAL (exp
)))
6607 struct varpool_node
*vnode
= varpool_get_node (exp
);
6608 if (vnode
&& resolution_local_p (vnode
->symbol
.resolution
))
6609 resolved_locally
= true;
6611 && resolution_to_local_definition_p (vnode
->symbol
.resolution
))
6612 resolved_to_local_def
= true;
6614 else if (TREE_CODE (exp
) == FUNCTION_DECL
&& TREE_PUBLIC (exp
))
6616 struct cgraph_node
*node
= cgraph_get_node (exp
);
6618 && resolution_local_p (node
->symbol
.resolution
))
6619 resolved_locally
= true;
6621 && resolution_to_local_definition_p (node
->symbol
.resolution
))
6622 resolved_to_local_def
= true;
6625 /* A non-decl is an entry in the constant pool. */
6628 /* Weakrefs may not bind locally, even though the weakref itself is always
6629 static and therefore local. Similarly, the resolver for ifunc functions
6630 might resolve to a non-local function.
6631 FIXME: We can resolve the weakref case more curefuly by looking at the
6633 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6634 || (TREE_CODE (exp
) == FUNCTION_DECL
6635 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6637 /* Static variables are always local. */
6638 else if (! TREE_PUBLIC (exp
))
6640 /* A variable is local if the user has said explicitly that it will
6642 else if ((DECL_VISIBILITY_SPECIFIED (exp
)
6643 || resolved_to_local_def
)
6644 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6646 /* Variables defined outside this object might not be local. */
6647 else if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6649 /* If defined in this object and visibility is not default, must be
6651 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6653 /* Default visibility weak data can be overridden by a strong symbol
6654 in another module and so are not local. */
6655 else if (DECL_WEAK (exp
)
6656 && !resolved_locally
)
6658 /* If PIC, then assume that any global name can be overridden by
6659 symbols resolved from other modules. */
6662 /* Uninitialized COMMON variable may be unified with symbols
6663 resolved from other modules. */
6664 else if (DECL_COMMON (exp
)
6665 && !resolved_locally
6666 && (DECL_INITIAL (exp
) == NULL
6667 || DECL_INITIAL (exp
) == error_mark_node
))
6669 /* Otherwise we're left with initialized (or non-common) global data
6670 which is of necessity defined locally. */
6677 /* Return true when references to DECL must bind to current definition in
6680 The condition is usually equivalent to whether the function binds to the
6681 current module (shared library or executable), that is to binds_local_p.
6682 We use this fact to avoid need for another target hook and implement
6683 the logic using binds_local_p and just special cases where
6684 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6685 the weak definitions (that can be overwritten at linktime by other
6686 definition from different object file) and when resolution info is available
6687 we simply use the knowledge passed to us by linker plugin. */
6689 decl_binds_to_current_def_p (tree decl
)
6691 gcc_assert (DECL_P (decl
));
6692 if (!TREE_PUBLIC (decl
))
6694 if (!targetm
.binds_local_p (decl
))
6696 /* When resolution is available, just use it. */
6697 if (TREE_CODE (decl
) == VAR_DECL
6698 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)))
6700 struct varpool_node
*vnode
= varpool_get_node (decl
);
6702 && vnode
->symbol
.resolution
!= LDPR_UNKNOWN
)
6703 return resolution_to_local_definition_p (vnode
->symbol
.resolution
);
6705 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
6707 struct cgraph_node
*node
= cgraph_get_node (decl
);
6709 && node
->symbol
.resolution
!= LDPR_UNKNOWN
)
6710 return resolution_to_local_definition_p (node
->symbol
.resolution
);
6712 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6713 binds locally but still can be overwritten).
6714 This rely on fact that binds_local_p behave as decl_replaceable_p
6715 for all other declaration types. */
6716 return !DECL_WEAK (decl
);
6719 /* A replaceable function or variable is one which may be replaced
6720 at link-time with an entirely different definition, provided that the
6721 replacement has the same type. For example, functions declared
6722 with __attribute__((weak)) on most systems are replaceable.
6724 COMDAT functions are not replaceable, since all definitions of the
6725 function must be equivalent. It is important that COMDAT functions
6726 not be treated as replaceable so that use of C++ template
6727 instantiations is not penalized. */
6730 decl_replaceable_p (tree decl
)
6732 gcc_assert (DECL_P (decl
));
6733 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
6735 return !decl_binds_to_current_def_p (decl
);
6738 /* Default function to output code that will globalize a label. A
6739 target must define GLOBAL_ASM_OP or provide its own function to
6740 globalize a label. */
6741 #ifdef GLOBAL_ASM_OP
6743 default_globalize_label (FILE * stream
, const char *name
)
6745 fputs (GLOBAL_ASM_OP
, stream
);
6746 assemble_name (stream
, name
);
6747 putc ('\n', stream
);
6749 #endif /* GLOBAL_ASM_OP */
6751 /* Default function to output code that will globalize a declaration. */
6753 default_globalize_decl_name (FILE * stream
, tree decl
)
6755 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6756 targetm
.asm_out
.globalize_label (stream
, name
);
6759 /* Default function to output a label for unwind information. The
6760 default is to do nothing. A target that needs nonlocal labels for
6761 unwind information must provide its own function to do this. */
6763 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6764 tree decl ATTRIBUTE_UNUSED
,
6765 int for_eh ATTRIBUTE_UNUSED
,
6766 int empty ATTRIBUTE_UNUSED
)
6770 /* Default function to output a label to divide up the exception table.
6771 The default is to do nothing. A target that needs/wants to divide
6772 up the table must provide it's own function to do this. */
6774 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
6778 /* This is how to output an internal numbered label where PREFIX is
6779 the class of label and LABELNO is the number within the class. */
6782 default_generate_internal_label (char *buf
, const char *prefix
,
6783 unsigned long labelno
)
6785 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6788 /* This is how to output an internal numbered label where PREFIX is
6789 the class of label and LABELNO is the number within the class. */
6792 default_internal_label (FILE *stream
, const char *prefix
,
6793 unsigned long labelno
)
6795 char *const buf
= (char *) alloca (40 + strlen (prefix
));
6796 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6797 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
6801 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
6804 default_asm_declare_constant_name (FILE *file
, const char *name
,
6805 const_tree exp ATTRIBUTE_UNUSED
,
6806 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
6808 assemble_label (file
, name
);
6811 /* This is the default behavior at the beginning of a file. It's
6812 controlled by two other target-hook toggles. */
6814 default_file_start (void)
6816 if (targetm
.asm_file_start_app_off
6817 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
6818 fputs (ASM_APP_OFF
, asm_out_file
);
6820 if (targetm
.asm_file_start_file_directive
)
6821 output_file_directive (asm_out_file
, main_input_filename
);
6824 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6825 which emits a special section directive used to indicate whether or
6826 not this object file needs an executable stack. This is primarily
6827 a GNU extension to ELF but could be used on other targets. */
6829 int trampolines_created
;
6832 file_end_indicate_exec_stack (void)
6834 unsigned int flags
= SECTION_DEBUG
;
6835 if (trampolines_created
)
6836 flags
|= SECTION_CODE
;
6838 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
6841 /* Emit a special section directive to indicate that this object file
6842 was compiled with -fsplit-stack. This is used to let the linker
6843 detect calls between split-stack code and non-split-stack code, so
6844 that it can modify the split-stack code to allocate a sufficiently
6845 large stack. We emit another special section if there are any
6846 functions in this file which have the no_split_stack attribute, to
6847 prevent the linker from warning about being unable to convert the
6848 functions if they call non-split-stack code. */
6851 file_end_indicate_split_stack (void)
6853 if (flag_split_stack
)
6855 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
6857 if (saw_no_split_stack
)
6858 switch_to_section (get_section (".note.GNU-no-split-stack",
6859 SECTION_DEBUG
, NULL
));
6863 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6864 a get_unnamed_section callback. */
6867 output_section_asm_op (const void *directive
)
6869 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
6872 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6873 the current section is NEW_SECTION. */
6876 switch_to_section (section
*new_section
)
6878 if (in_section
== new_section
)
6881 if (new_section
->common
.flags
& SECTION_FORGET
)
6884 in_section
= new_section
;
6886 switch (SECTION_STYLE (new_section
))
6889 targetm
.asm_out
.named_section (new_section
->named
.name
,
6890 new_section
->named
.common
.flags
,
6891 new_section
->named
.decl
);
6894 case SECTION_UNNAMED
:
6895 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
6898 case SECTION_NOSWITCH
:
6903 new_section
->common
.flags
|= SECTION_DECLARED
;
6906 /* If block symbol SYMBOL has not yet been assigned an offset, place
6907 it at the end of its block. */
6910 place_block_symbol (rtx symbol
)
6912 unsigned HOST_WIDE_INT size
, mask
, offset
;
6913 struct constant_descriptor_rtx
*desc
;
6914 unsigned int alignment
;
6915 struct object_block
*block
;
6918 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
6919 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
6922 /* Work out the symbol's size and alignment. */
6923 if (CONSTANT_POOL_ADDRESS_P (symbol
))
6925 desc
= SYMBOL_REF_CONSTANT (symbol
);
6926 alignment
= desc
->align
;
6927 size
= GET_MODE_SIZE (desc
->mode
);
6929 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
6931 decl
= SYMBOL_REF_DECL (symbol
);
6932 alignment
= DECL_ALIGN (decl
);
6933 size
= get_constant_size (DECL_INITIAL (decl
));
6935 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
6936 && asan_protect_global (DECL_INITIAL (decl
)))
6937 size
+= asan_red_zone_size (size
);
6941 decl
= SYMBOL_REF_DECL (symbol
);
6942 alignment
= DECL_ALIGN (decl
);
6943 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
6944 if (flag_asan
&& asan_protect_global (decl
))
6946 size
+= asan_red_zone_size (size
);
6947 alignment
= MAX (alignment
,
6948 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
6952 /* Calculate the object's offset from the start of the block. */
6953 block
= SYMBOL_REF_BLOCK (symbol
);
6954 mask
= alignment
/ BITS_PER_UNIT
- 1;
6955 offset
= (block
->size
+ mask
) & ~mask
;
6956 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
6958 /* Record the block's new alignment and size. */
6959 block
->alignment
= MAX (block
->alignment
, alignment
);
6960 block
->size
= offset
+ size
;
6962 vec_safe_push (block
->objects
, symbol
);
6965 /* Return the anchor that should be used to address byte offset OFFSET
6966 from the first object in BLOCK. MODEL is the TLS model used
6970 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
6971 enum tls_model model
)
6974 unsigned int begin
, middle
, end
;
6975 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
6978 /* Work out the anchor's offset. Use an offset of 0 for the first
6979 anchor so that we don't pessimize the case where we take the address
6980 of a variable at the beginning of the block. This is particularly
6981 useful when a block has only one variable assigned to it.
6983 We try to place anchors RANGE bytes apart, so there can then be
6984 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
6985 a ptr_mode offset. With some target settings, the lowest such
6986 anchor might be out of range for the lowest ptr_mode offset;
6987 likewise the highest anchor for the highest offset. Use anchors
6988 at the extreme ends of the ptr_mode range in such cases.
6990 All arithmetic uses unsigned integers in order to avoid
6992 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
6993 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
6994 range
= max_offset
- min_offset
+ 1;
6999 bias
= 1 << (GET_MODE_BITSIZE (ptr_mode
) - 1);
7002 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7003 delta
-= delta
% range
;
7006 offset
= (HOST_WIDE_INT
) (-delta
);
7010 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7011 delta
-= delta
% range
;
7012 if (delta
> bias
- 1)
7014 offset
= (HOST_WIDE_INT
) delta
;
7018 /* Do a binary search to see if there's already an anchor we can use.
7019 Set BEGIN to the new anchor's index if not. */
7021 end
= vec_safe_length (block
->anchors
);
7022 while (begin
!= end
)
7024 middle
= (end
+ begin
) / 2;
7025 anchor
= (*block
->anchors
)[middle
];
7026 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7028 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7030 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7032 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7038 /* Create a new anchor with a unique label. */
7039 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7040 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7041 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7042 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7044 /* Insert it at index BEGIN. */
7045 vec_safe_insert (block
->anchors
, begin
, anchor
);
7049 /* Output the objects in BLOCK. */
7052 output_object_block (struct object_block
*block
)
7054 struct constant_descriptor_rtx
*desc
;
7056 HOST_WIDE_INT offset
;
7060 if (!block
->objects
)
7063 /* Switch to the section and make sure that the first byte is
7064 suitably aligned. */
7065 switch_to_section (block
->sect
);
7066 assemble_align (block
->alignment
);
7068 /* Define the values of all anchors relative to the current section
7070 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7071 targetm
.asm_out
.output_anchor (symbol
);
7073 /* Output the objects themselves. */
7075 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7077 /* Move to the object's offset, padding with zeros if necessary. */
7078 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7079 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7080 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7082 desc
= SYMBOL_REF_CONSTANT (symbol
);
7083 output_constant_pool_1 (desc
, 1);
7084 offset
+= GET_MODE_SIZE (desc
->mode
);
7086 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7089 decl
= SYMBOL_REF_DECL (symbol
);
7090 assemble_constant_contents (DECL_INITIAL (decl
), XSTR (symbol
, 0),
7092 size
= get_constant_size (DECL_INITIAL (decl
));
7095 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7096 && asan_protect_global (DECL_INITIAL (decl
)))
7098 size
= asan_red_zone_size (size
);
7099 assemble_zeros (size
);
7106 decl
= SYMBOL_REF_DECL (symbol
);
7107 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7108 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
7110 if (flag_asan
&& asan_protect_global (decl
))
7112 size
= asan_red_zone_size (size
);
7113 assemble_zeros (size
);
7120 /* A htab_traverse callback used to call output_object_block for
7121 each member of object_block_htab. */
7124 output_object_block_htab (void **slot
, void *data ATTRIBUTE_UNUSED
)
7126 output_object_block ((struct object_block
*) (*slot
));
7130 /* Output the definitions of all object_blocks. */
7133 output_object_blocks (void)
7135 htab_traverse (object_block_htab
, output_object_block_htab
, NULL
);
7138 /* This function provides a possible implementation of the
7139 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7140 by -frecord-gcc-switches it creates a new mergeable, string section in the
7141 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7142 contains the switches in ASCII format.
7144 FIXME: This code does not correctly handle double quote characters
7145 that appear inside strings, (it strips them rather than preserving them).
7146 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7147 characters - instead it treats them as sub-string separators. Since
7148 we want to emit NUL strings terminators into the object file we have to use
7152 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7156 case SWITCH_TYPE_PASSED
:
7157 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7158 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7161 case SWITCH_TYPE_DESCRIPTIVE
:
7164 /* Distinguish between invocations where name is NULL. */
7165 static bool started
= false;
7171 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7175 | (SECTION_ENTSIZE
& 1),
7177 switch_to_section (sec
);
7186 /* The return value is currently ignored by the caller, but must be 0.
7187 For -fverbose-asm the return value would be the number of characters
7188 emitted into the assembler file. */
7192 /* Emit text to declare externally defined symbols. It is needed to
7193 properly support non-default visibility. */
7195 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7197 const char *name ATTRIBUTE_UNUSED
)
7199 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7200 set in order to avoid putting out names that are never really
7202 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7203 && targetm
.binds_local_p (decl
))
7204 maybe_assemble_visibility (decl
);
7207 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7210 default_asm_output_source_filename (FILE *file
, const char *name
)
7212 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7213 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7215 fprintf (file
, "\t.file\t");
7216 output_quoted_string (file
, name
);
7221 /* Output a file name in the form wanted by System V. */
7224 output_file_directive (FILE *asm_file
, const char *input_name
)
7229 if (input_name
== NULL
)
7230 input_name
= "<stdin>";
7232 input_name
= remap_debug_filename (input_name
);
7234 len
= strlen (input_name
);
7235 na
= input_name
+ len
;
7237 /* NA gets INPUT_NAME sans directory names. */
7238 while (na
> input_name
)
7240 if (IS_DIR_SEPARATOR (na
[-1]))
7245 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7248 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7251 make_debug_expr_from_rtl (const_rtx exp
)
7253 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7254 enum machine_mode mode
= GET_MODE (exp
);
7257 DECL_ARTIFICIAL (ddecl
) = 1;
7258 if (REG_P (exp
) && REG_EXPR (exp
))
7259 type
= TREE_TYPE (REG_EXPR (exp
));
7260 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7261 type
= TREE_TYPE (MEM_EXPR (exp
));
7264 if (type
&& TYPE_MODE (type
) == mode
)
7265 TREE_TYPE (ddecl
) = type
;
7267 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7268 DECL_MODE (ddecl
) = mode
;
7269 dval
= gen_rtx_DEBUG_EXPR (mode
);
7270 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7271 SET_DECL_RTL (ddecl
, dval
);
7275 #ifdef ELF_ASCII_ESCAPES
7276 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7279 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7284 fputs (STRING_ASM_OP
, f
);
7289 escape
= ELF_ASCII_ESCAPES
[c
];
7296 /* TODO: Print in hex with fast function, important for -flto. */
7297 fprintf (f
, "\\%03o", c
);
7310 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7313 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7315 const char *limit
= s
+ len
;
7316 const char *last_null
= NULL
;
7317 unsigned bytes_in_chunk
= 0;
7321 for (; s
< limit
; s
++)
7325 if (bytes_in_chunk
>= 60)
7334 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7341 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7343 if (bytes_in_chunk
> 0)
7350 default_elf_asm_output_limited_string (f
, s
);
7355 if (bytes_in_chunk
== 0)
7356 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7359 escape
= ELF_ASCII_ESCAPES
[c
];
7367 /* TODO: Print in hex with fast function, important for -flto. */
7368 fprintf (f
, "\\%03o", c
);
7369 bytes_in_chunk
+= 4;
7374 bytes_in_chunk
+= 2;
7381 if (bytes_in_chunk
> 0)
7389 static GTY(()) section
*elf_init_array_section
;
7390 static GTY(()) section
*elf_fini_array_section
;
7393 get_elf_initfini_array_priority_section (int priority
,
7397 if (priority
!= DEFAULT_INIT_PRIORITY
)
7400 sprintf (buf
, "%s.%.5u",
7401 constructor_p
? ".init_array" : ".fini_array",
7403 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7409 if (elf_init_array_section
== NULL
)
7410 elf_init_array_section
7411 = get_section (".init_array",
7412 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7413 sec
= elf_init_array_section
;
7417 if (elf_fini_array_section
== NULL
)
7418 elf_fini_array_section
7419 = get_section (".fini_array",
7420 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7421 sec
= elf_fini_array_section
;
7427 /* Use .init_array section for constructors. */
7430 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7432 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7434 assemble_addr_to_section (symbol
, sec
);
7437 /* Use .fini_array section for destructors. */
7440 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7442 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7444 assemble_addr_to_section (symbol
, sec
);
7447 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7449 This is a bit of a cheat. The real default is a no-op, but this
7450 hook is the default for all targets with a .ident directive. */
7453 default_asm_output_ident_directive (const char *ident_str
)
7455 const char *ident_asm_op
= "\t.ident\t";
7457 /* If we are still in the front end, do not write out the string
7458 to asm_out_file. Instead, add a fake top-level asm statement.
7459 This allows the front ends to use this hook without actually
7460 writing to asm_out_file, to handle #ident or Pragma Ident. */
7461 if (cgraph_state
== CGRAPH_STATE_PARSING
)
7463 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7464 add_asm_node (build_string (strlen (buf
), buf
));
7467 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7470 #include "gt-varasm.h"