1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987-2013 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
21 /* This file handles generation of all the assembler code
22 *except* the instructions of a function.
23 This includes declarations of variables and their initial values.
25 We also output the assembler code for constants stored in memory
26 and are responsible for combining constants with the same value. */
30 #include "coretypes.h"
37 #include "hard-reg-set.h"
40 #include "diagnostic-core.h"
43 #include "langhooks.h"
47 #include "common/common-target.h"
48 #include "targhooks.h"
49 #include "tree-mudflap.h"
51 #include "pointer-set.h"
54 #ifdef XCOFF_DEBUGGING_INFO
55 #include "xcoffout.h" /* Needed for external data
56 declarations for e.g. AIX 4.x. */
59 /* The (assembler) name of the first globally-visible object output. */
60 extern GTY(()) const char *first_global_object_name
;
61 extern GTY(()) const char *weak_global_object_name
;
63 const char *first_global_object_name
;
64 const char *weak_global_object_name
;
67 struct constant_descriptor_rtx
;
68 struct rtx_constant_pool
;
70 #define n_deferred_constants (crtl->varasm.deferred_constants)
72 /* Number for making the label on the next
73 constant that is stored in memory. */
75 static GTY(()) int const_labelno
;
77 /* Carry information from ASM_DECLARE_OBJECT_NAME
78 to ASM_FINISH_DECLARE_OBJECT. */
80 int size_directive_output
;
82 /* The last decl for which assemble_variable was called,
83 if it did ASM_DECLARE_OBJECT_NAME.
84 If the last call to assemble_variable didn't do that,
87 tree last_assemble_variable_decl
;
89 /* The following global variable indicates if the first basic block
90 in a function belongs to the cold partition or not. */
92 bool first_function_block_is_cold
;
94 /* We give all constants their own alias set. Perhaps redundant with
95 MEM_READONLY_P, but pre-dates it. */
97 static alias_set_type const_alias_set
;
99 /* Whether we saw any functions with no_split_stack. */
101 static bool saw_no_split_stack
;
103 static const char *strip_reg_name (const char *);
104 static int contains_pointers_p (tree
);
105 #ifdef ASM_OUTPUT_EXTERNAL
106 static bool incorporeal_function_p (tree
);
108 static void decode_addr_const (tree
, struct addr_const
*);
109 static hashval_t
const_desc_hash (const void *);
110 static int const_desc_eq (const void *, const void *);
111 static hashval_t
const_hash_1 (const tree
);
112 static int compare_constant (const tree
, const tree
);
113 static tree
copy_constant (tree
);
114 static void output_constant_def_contents (rtx
);
115 static void output_addressed_constants (tree
);
116 static unsigned HOST_WIDE_INT
array_size_for_constructor (tree
);
117 static unsigned min_align (unsigned, unsigned);
118 static void globalize_decl (tree
);
119 static bool decl_readonly_section_1 (enum section_category
);
120 #ifdef BSS_SECTION_ASM_OP
121 #ifdef ASM_OUTPUT_ALIGNED_BSS
122 static void asm_output_aligned_bss (FILE *, tree
, const char *,
123 unsigned HOST_WIDE_INT
, int)
126 #endif /* BSS_SECTION_ASM_OP */
127 static void mark_weak (tree
);
128 static void output_constant_pool (const char *, tree
);
130 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
131 section
*text_section
;
132 section
*data_section
;
133 section
*readonly_data_section
;
134 section
*sdata_section
;
135 section
*ctors_section
;
136 section
*dtors_section
;
137 section
*bss_section
;
138 section
*sbss_section
;
140 /* Various forms of common section. All are guaranteed to be nonnull. */
141 section
*tls_comm_section
;
142 section
*comm_section
;
143 section
*lcomm_section
;
145 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
147 section
*bss_noswitch_section
;
149 /* The section that holds the main exception table, when known. The section
150 is set either by the target's init_sections hook or by the first call to
151 switch_to_exception_section. */
152 section
*exception_section
;
154 /* The section that holds the DWARF2 frame unwind information, when known.
155 The section is set either by the target's init_sections hook or by the
156 first call to switch_to_eh_frame_section. */
157 section
*eh_frame_section
;
159 /* asm_out_file's current section. This is NULL if no section has yet
160 been selected or if we lose track of what the current section is. */
163 /* True if code for the current function is currently being directed
164 at the cold section. */
165 bool in_cold_section_p
;
167 /* A linked list of all the unnamed sections. */
168 static GTY(()) section
*unnamed_sections
;
170 /* Return a nonzero value if DECL has a section attribute. */
171 #define IN_NAMED_SECTION(DECL) \
172 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
173 && DECL_SECTION_NAME (DECL) != NULL_TREE)
175 /* Hash table of named sections. */
176 static GTY((param_is (section
))) htab_t section_htab
;
178 /* A table of object_blocks, indexed by section. */
179 static GTY((param_is (struct object_block
))) htab_t object_block_htab
;
181 /* The next number to use for internal anchor labels. */
182 static GTY(()) int anchor_labelno
;
184 /* A pool of constants that can be shared between functions. */
185 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
187 /* Helper routines for maintaining section_htab. */
190 section_entry_eq (const void *p1
, const void *p2
)
192 const section
*old
= (const section
*) p1
;
193 const char *new_name
= (const char *) p2
;
195 return strcmp (old
->named
.name
, new_name
) == 0;
199 section_entry_hash (const void *p
)
201 const section
*old
= (const section
*) p
;
202 return htab_hash_string (old
->named
.name
);
205 /* Return a hash value for section SECT. */
208 hash_section (section
*sect
)
210 if (sect
->common
.flags
& SECTION_NAMED
)
211 return htab_hash_string (sect
->named
.name
);
212 return sect
->common
.flags
;
215 /* Helper routines for maintaining object_block_htab. */
218 object_block_entry_eq (const void *p1
, const void *p2
)
220 const struct object_block
*old
= (const struct object_block
*) p1
;
221 const section
*new_section
= (const section
*) p2
;
223 return old
->sect
== new_section
;
227 object_block_entry_hash (const void *p
)
229 const struct object_block
*old
= (const struct object_block
*) p
;
230 return hash_section (old
->sect
);
233 /* Return a new unnamed section with the given fields. */
236 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
241 sect
= ggc_alloc_section ();
242 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
243 sect
->unnamed
.callback
= callback
;
244 sect
->unnamed
.data
= data
;
245 sect
->unnamed
.next
= unnamed_sections
;
247 unnamed_sections
= sect
;
251 /* Return a SECTION_NOSWITCH section with the given fields. */
254 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
258 sect
= ggc_alloc_section ();
259 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
260 sect
->noswitch
.callback
= callback
;
265 /* Return the named section structure associated with NAME. Create
266 a new section with the given fields if no such structure exists. */
269 get_section (const char *name
, unsigned int flags
, tree decl
)
271 section
*sect
, **slot
;
274 htab_find_slot_with_hash (section_htab
, name
,
275 htab_hash_string (name
), INSERT
);
276 flags
|= SECTION_NAMED
;
279 sect
= ggc_alloc_section ();
280 sect
->named
.common
.flags
= flags
;
281 sect
->named
.name
= ggc_strdup (name
);
282 sect
->named
.decl
= decl
;
288 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
289 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
291 /* It is fine if one of the section flags is
292 SECTION_WRITE | SECTION_RELRO and the other has none of these
293 flags (i.e. read-only) in named sections and either the
294 section hasn't been declared yet or has been declared as writable.
295 In that case just make sure the resulting flags are
296 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
298 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
299 == (SECTION_WRITE
| SECTION_RELRO
)
300 && (sect
->common
.flags
301 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
302 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
303 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
304 || (sect
->common
.flags
& SECTION_WRITE
)))
306 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
309 /* Sanity check user variables for flag changes. */
311 decl
= sect
->named
.decl
;
313 if (sect
->named
.decl
== NULL
)
314 error ("%+D causes a section type conflict", decl
);
317 error ("%+D causes a section type conflict with %D",
318 decl
, sect
->named
.decl
);
319 if (decl
!= sect
->named
.decl
)
320 inform (DECL_SOURCE_LOCATION (sect
->named
.decl
),
321 "%qD was declared here", sect
->named
.decl
);
323 /* Make sure we don't error about one section multiple times. */
324 sect
->common
.flags
|= SECTION_OVERRIDE
;
330 /* Return true if the current compilation mode benefits from having
331 objects grouped into blocks. */
334 use_object_blocks_p (void)
336 return flag_section_anchors
;
339 /* Return the object_block structure for section SECT. Create a new
340 structure if we haven't created one already. Return null if SECT
343 static struct object_block
*
344 get_block_for_section (section
*sect
)
346 struct object_block
*block
;
352 slot
= htab_find_slot_with_hash (object_block_htab
, sect
,
353 hash_section (sect
), INSERT
);
354 block
= (struct object_block
*) *slot
;
357 block
= ggc_alloc_cleared_object_block ();
364 /* Create a symbol with label LABEL and place it at byte offset
365 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
366 is not yet known. LABEL must be a garbage-collected string. */
369 create_block_symbol (const char *label
, struct object_block
*block
,
370 HOST_WIDE_INT offset
)
375 /* Create the extended SYMBOL_REF. */
376 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
377 symbol
= ggc_alloc_rtx_def (size
);
379 /* Initialize the normal SYMBOL_REF fields. */
380 memset (symbol
, 0, size
);
381 PUT_CODE (symbol
, SYMBOL_REF
);
382 PUT_MODE (symbol
, Pmode
);
383 XSTR (symbol
, 0) = label
;
384 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
386 /* Initialize the block_symbol stuff. */
387 SYMBOL_REF_BLOCK (symbol
) = block
;
388 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
393 /* Return a section with a particular name and with whatever SECTION_*
394 flags section_type_flags deems appropriate. The name of the section
395 is taken from NAME if nonnull, otherwise it is taken from DECL's
396 DECL_SECTION_NAME. DECL is the decl associated with the section
397 (see the section comment for details) and RELOC is as for
398 section_type_flags. */
401 get_named_section (tree decl
, const char *name
, int reloc
)
407 gcc_assert (decl
&& DECL_P (decl
) && DECL_SECTION_NAME (decl
));
408 name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
411 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
413 if (decl
&& !DECL_P (decl
))
415 return get_section (name
, flags
, decl
);
418 /* If required, set DECL_SECTION_NAME to a unique name. */
421 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
422 int flag_function_or_data_sections
)
424 if (DECL_SECTION_NAME (decl
) == NULL_TREE
425 && targetm_common
.have_named_sections
426 && (flag_function_or_data_sections
427 || DECL_ONE_ONLY (decl
)))
429 targetm
.asm_out
.unique_section (decl
, reloc
);
430 DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
) = true;
434 #ifdef BSS_SECTION_ASM_OP
436 #ifdef ASM_OUTPUT_ALIGNED_BSS
438 /* Utility function for targets to use in implementing
439 ASM_OUTPUT_ALIGNED_BSS.
440 ??? It is believed that this function will work in most cases so such
441 support is localized here. */
444 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
445 const char *name
, unsigned HOST_WIDE_INT size
,
448 switch_to_section (bss_section
);
449 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
450 #ifdef ASM_DECLARE_OBJECT_NAME
451 last_assemble_variable_decl
= decl
;
452 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
454 /* Standard thing is just output label for the object. */
455 ASM_OUTPUT_LABEL (file
, name
);
456 #endif /* ASM_DECLARE_OBJECT_NAME */
457 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
462 #endif /* BSS_SECTION_ASM_OP */
464 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
465 /* Return the hot section for function DECL. Return text_section for
469 hot_function_section (tree decl
)
471 if (decl
!= NULL_TREE
472 && DECL_SECTION_NAME (decl
) != NULL_TREE
473 && targetm_common
.have_named_sections
)
474 return get_named_section (decl
, NULL
, 0);
480 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
483 When DECL_SECTION_NAME is non-NULL and it is implicit section and
484 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
485 concatenate the name with NAMED_SECTION_SUFFIX.
486 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
489 get_named_text_section (tree decl
,
490 const char *text_section_name
,
491 const char *named_section_suffix
)
493 if (decl
&& DECL_SECTION_NAME (decl
))
495 if (named_section_suffix
)
497 tree dsn
= DECL_SECTION_NAME (decl
);
498 const char *stripped_name
;
501 name
= (char *) alloca (TREE_STRING_LENGTH (dsn
) + 1);
502 memcpy (name
, TREE_STRING_POINTER (dsn
),
503 TREE_STRING_LENGTH (dsn
) + 1);
505 stripped_name
= targetm
.strip_name_encoding (name
);
507 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
508 return get_named_section (decl
, buffer
, 0);
510 else if (DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
))
514 /* Do not try to split gnu_linkonce functions. This gets somewhat
516 if (DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
)
518 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
519 name
= targetm
.strip_name_encoding (name
);
520 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
526 return get_named_section (decl
, text_section_name
, 0);
529 /* Choose named function section based on its frequency. */
532 default_function_section (tree decl
, enum node_frequency freq
,
533 bool startup
, bool exit
)
535 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
536 /* Old GNU linkers have buggy --gc-section support, which sometimes
537 results in .gcc_except_table* sections being garbage collected. */
539 && DECL_SECTION_NAME (decl
)
540 && DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
))
544 if (!flag_reorder_functions
545 || !targetm_common
.have_named_sections
)
547 /* Startup code should go to startup subsection unless it is
548 unlikely executed (this happens especially with function splitting
549 where we can split away unnecessary parts of static constructors. */
550 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
551 return get_named_text_section (decl
, ".text.startup", NULL
);
553 /* Similarly for exit. */
554 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
555 return get_named_text_section (decl
, ".text.exit", NULL
);
557 /* Group cold functions together, similarly for hot code. */
560 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
561 return get_named_text_section (decl
, ".text.unlikely", NULL
);
562 case NODE_FREQUENCY_HOT
:
563 return get_named_text_section (decl
, ".text.hot", NULL
);
569 /* Return the section for function DECL.
571 If DECL is NULL_TREE, return the text section. We can be passed
572 NULL_TREE under some circumstances by dbxout.c at least.
574 If FORCE_COLD is true, return cold function section ignoring
575 the frequency info of cgraph_node. */
578 function_section_1 (tree decl
, bool force_cold
)
580 section
*section
= NULL
;
581 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
582 bool startup
= false, exit
= false;
586 struct cgraph_node
*node
= cgraph_get_node (decl
);
590 freq
= node
->frequency
;
591 startup
= node
->only_called_at_startup
;
592 exit
= node
->only_called_at_exit
;
596 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
598 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
599 if (decl
!= NULL_TREE
600 && DECL_SECTION_NAME (decl
) != NULL_TREE
)
602 if (targetm
.asm_out
.function_section
)
603 section
= targetm
.asm_out
.function_section (decl
, freq
,
607 return get_named_section (decl
, NULL
, 0);
610 return targetm
.asm_out
.select_section
611 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
614 if (targetm
.asm_out
.function_section
)
615 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
618 return hot_function_section (decl
);
622 /* Return the section for function DECL.
624 If DECL is NULL_TREE, return the text section. We can be passed
625 NULL_TREE under some circumstances by dbxout.c at least. */
628 function_section (tree decl
)
630 /* Handle cases where function splitting code decides
631 to put function entry point into unlikely executed section
632 despite the fact that the function itself is not cold
633 (i.e. it is called rarely but contains a hot loop that is
634 better to live in hot subsection for the code locality). */
635 return function_section_1 (decl
,
636 first_function_block_is_cold
);
639 /* Return the section for the current function, take IN_COLD_SECTION_P
643 current_function_section (void)
645 return function_section_1 (current_function_decl
, in_cold_section_p
);
648 /* Tell assembler to switch to unlikely-to-be-executed text section. */
651 unlikely_text_section (void)
653 return function_section_1 (current_function_decl
, true);
656 /* When called within a function context, return true if the function
657 has been assigned a cold text section and if SECT is that section.
658 When called outside a function context, return true if SECT is the
659 default cold section. */
662 unlikely_text_section_p (section
*sect
)
664 return sect
== function_section_1 (current_function_decl
, true);
667 /* Return the read-only data section associated with function DECL. */
670 default_function_rodata_section (tree decl
)
672 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
674 const char *name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
676 if (DECL_ONE_ONLY (decl
) && HAVE_COMDAT_GROUP
)
682 dot
= strchr (name
+ 1, '.');
685 len
= strlen (dot
) + 8;
686 rname
= (char *) alloca (len
);
688 strcpy (rname
, ".rodata");
690 return get_section (rname
, SECTION_LINKONCE
, decl
);
692 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
693 else if (DECL_ONE_ONLY (decl
)
694 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
696 size_t len
= strlen (name
) + 1;
697 char *rname
= (char *) alloca (len
);
699 memcpy (rname
, name
, len
);
701 return get_section (rname
, SECTION_LINKONCE
, decl
);
703 /* For .text.foo we want to use .rodata.foo. */
704 else if (flag_function_sections
&& flag_data_sections
705 && strncmp (name
, ".text.", 6) == 0)
707 size_t len
= strlen (name
) + 1;
708 char *rname
= (char *) alloca (len
+ 2);
710 memcpy (rname
, ".rodata", 7);
711 memcpy (rname
+ 7, name
+ 5, len
- 5);
712 return get_section (rname
, 0, decl
);
716 return readonly_data_section
;
719 /* Return the read-only data section associated with function DECL
720 for targets where that section should be always the single
721 readonly data section. */
724 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
726 return readonly_data_section
;
729 /* Return the section to use for string merging. */
732 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
733 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
734 unsigned int flags ATTRIBUTE_UNUSED
)
738 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
739 && TREE_CODE (decl
) == STRING_CST
740 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
742 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
743 && TREE_STRING_LENGTH (decl
) >= len
)
745 enum machine_mode mode
;
746 unsigned int modesize
;
750 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
751 char *name
= (char *) alloca (strlen (prefix
) + 30);
753 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
754 modesize
= GET_MODE_BITSIZE (mode
);
755 if (modesize
>= 8 && modesize
<= 256
756 && (modesize
& (modesize
- 1)) == 0)
758 if (align
< modesize
)
761 str
= TREE_STRING_POINTER (decl
);
762 unit
= GET_MODE_SIZE (mode
);
764 /* Check for embedded NUL characters. */
765 for (i
= 0; i
< len
; i
+= unit
)
767 for (j
= 0; j
< unit
; j
++)
768 if (str
[i
+ j
] != '\0')
775 sprintf (name
, "%s.str%d.%d", prefix
,
776 modesize
/ 8, (int) (align
/ 8));
777 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
778 return get_section (name
, flags
, NULL
);
783 return readonly_data_section
;
786 /* Return the section to use for constant merging. */
789 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
790 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
791 unsigned int flags ATTRIBUTE_UNUSED
)
793 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
795 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
801 && (align
& (align
- 1)) == 0)
803 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
804 char *name
= (char *) alloca (strlen (prefix
) + 30);
806 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
807 flags
|= (align
/ 8) | SECTION_MERGE
;
808 return get_section (name
, flags
, NULL
);
810 return readonly_data_section
;
813 /* Given NAME, a putative register name, discard any customary prefixes. */
816 strip_reg_name (const char *name
)
818 #ifdef REGISTER_PREFIX
819 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
820 name
+= strlen (REGISTER_PREFIX
);
822 if (name
[0] == '%' || name
[0] == '#')
827 /* The user has asked for a DECL to have a particular name. Set (or
828 change) it in such a way that we don't prefix an underscore to
831 set_user_assembler_name (tree decl
, const char *name
)
833 char *starred
= (char *) alloca (strlen (name
) + 2);
835 strcpy (starred
+ 1, name
);
836 change_decl_assembler_name (decl
, get_identifier (starred
));
837 SET_DECL_RTL (decl
, NULL_RTX
);
840 /* Decode an `asm' spec for a declaration as a register name.
841 Return the register number, or -1 if nothing specified,
842 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
843 or -3 if ASMSPEC is `cc' and is not recognized,
844 or -4 if ASMSPEC is `memory' and is not recognized.
845 Accept an exact spelling or a decimal number.
846 Prefixes such as % are optional. */
849 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
851 /* Presume just one register is clobbered. */
858 /* Get rid of confusing prefixes. */
859 asmspec
= strip_reg_name (asmspec
);
861 /* Allow a decimal number as a "register name". */
862 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
863 if (! ISDIGIT (asmspec
[i
]))
865 if (asmspec
[0] != 0 && i
< 0)
868 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0)
874 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
876 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
879 #ifdef OVERLAPPING_REGISTER_NAMES
883 const char *const name
;
886 } table
[] = OVERLAPPING_REGISTER_NAMES
;
888 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
890 && ! strcmp (asmspec
, table
[i
].name
))
892 *pnregs
= table
[i
].nregs
;
893 return table
[i
].number
;
896 #endif /* OVERLAPPING_REGISTER_NAMES */
898 #ifdef ADDITIONAL_REGISTER_NAMES
900 static const struct { const char *const name
; const int number
; } table
[]
901 = ADDITIONAL_REGISTER_NAMES
;
903 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
905 && ! strcmp (asmspec
, table
[i
].name
))
906 return table
[i
].number
;
908 #endif /* ADDITIONAL_REGISTER_NAMES */
910 if (!strcmp (asmspec
, "memory"))
913 if (!strcmp (asmspec
, "cc"))
923 decode_reg_name (const char *name
)
926 return decode_reg_name_and_count (name
, &count
);
930 /* Return true if DECL's initializer is suitable for a BSS section. */
933 bss_initializer_p (const_tree decl
)
935 return (DECL_INITIAL (decl
) == NULL
936 || DECL_INITIAL (decl
) == error_mark_node
937 || (flag_zero_initialized_in_bss
938 /* Leave constant zeroes in .rodata so they
940 && !TREE_READONLY (decl
)
941 && initializer_zerop (DECL_INITIAL (decl
))));
944 /* Compute the alignment of variable specified by DECL.
945 DONT_OUTPUT_DATA is from assemble_variable. */
948 align_variable (tree decl
, bool dont_output_data
)
950 unsigned int align
= DECL_ALIGN (decl
);
952 /* In the case for initialing an array whose length isn't specified,
953 where we have not yet been able to do the layout,
954 figure out the proper alignment now. */
955 if (dont_output_data
&& DECL_SIZE (decl
) == 0
956 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
957 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
959 /* Some object file formats have a maximum alignment which they support.
960 In particular, a.out format supports a maximum alignment of 4. */
961 if (align
> MAX_OFILE_ALIGNMENT
)
963 warning (0, "alignment of %q+D is greater than maximum object "
964 "file alignment. Using %d", decl
,
965 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
966 align
= MAX_OFILE_ALIGNMENT
;
969 /* On some machines, it is good to increase alignment sometimes. */
970 if (! DECL_USER_ALIGN (decl
))
972 #ifdef DATA_ALIGNMENT
973 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
974 /* Don't increase alignment too much for TLS variables - TLS space
976 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
979 #ifdef CONSTANT_ALIGNMENT
980 if (DECL_INITIAL (decl
) != 0 && DECL_INITIAL (decl
) != error_mark_node
)
982 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
984 /* Don't increase alignment too much for TLS variables - TLS space
986 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
992 /* Reset the alignment in case we have made it tighter, so we can benefit
993 from it in get_pointer_alignment. */
994 DECL_ALIGN (decl
) = align
;
997 /* Return the section into which the given VAR_DECL or CONST_DECL
998 should be placed. PREFER_NOSWITCH_P is true if a noswitch
999 section should be used wherever possible. */
1002 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1004 addr_space_t as
= ADDR_SPACE_GENERIC
;
1007 if (TREE_TYPE (decl
) != error_mark_node
)
1008 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1010 if (DECL_COMMON (decl
))
1012 /* If the decl has been given an explicit section name, or it resides
1013 in a non-generic address space, then it isn't common, and shouldn't
1014 be handled as such. */
1015 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1016 && ADDR_SPACE_GENERIC_P (as
));
1017 if (DECL_THREAD_LOCAL_P (decl
))
1018 return tls_comm_section
;
1019 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1020 return comm_section
;
1023 if (DECL_INITIAL (decl
) == error_mark_node
)
1024 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1025 else if (DECL_INITIAL (decl
))
1026 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1030 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1031 if (IN_NAMED_SECTION (decl
))
1032 return get_named_section (decl
, NULL
, reloc
);
1034 if (ADDR_SPACE_GENERIC_P (as
)
1035 && !DECL_THREAD_LOCAL_P (decl
)
1036 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1037 && bss_initializer_p (decl
))
1039 if (!TREE_PUBLIC (decl
)
1040 && !(flag_asan
&& asan_protect_global (decl
)))
1041 return lcomm_section
;
1042 if (bss_noswitch_section
)
1043 return bss_noswitch_section
;
1046 return targetm
.asm_out
.select_section (decl
, reloc
, DECL_ALIGN (decl
));
1049 /* Return the block into which object_block DECL should be placed. */
1051 static struct object_block
*
1052 get_block_for_decl (tree decl
)
1056 if (TREE_CODE (decl
) == VAR_DECL
)
1058 /* The object must be defined in this translation unit. */
1059 if (DECL_EXTERNAL (decl
))
1062 /* There's no point using object blocks for something that is
1063 isolated by definition. */
1064 if (DECL_ONE_ONLY (decl
))
1068 /* We can only calculate block offsets if the decl has a known
1070 if (DECL_SIZE_UNIT (decl
) == NULL
)
1072 if (!host_integerp (DECL_SIZE_UNIT (decl
), 1))
1075 /* Find out which section should contain DECL. We cannot put it into
1076 an object block if it requires a standalone definition. */
1077 if (TREE_CODE (decl
) == VAR_DECL
)
1078 align_variable (decl
, 0);
1079 sect
= get_variable_section (decl
, true);
1080 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1083 return get_block_for_section (sect
);
1086 /* Make sure block symbol SYMBOL is in block BLOCK. */
1089 change_symbol_block (rtx symbol
, struct object_block
*block
)
1091 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1093 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1094 SYMBOL_REF_BLOCK (symbol
) = block
;
1098 /* Return true if it is possible to put DECL in an object_block. */
1101 use_blocks_for_decl_p (tree decl
)
1103 /* Only data DECLs can be placed into object blocks. */
1104 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1107 /* Detect decls created by dw2_force_const_mem. Such decls are
1108 special because DECL_INITIAL doesn't specify the decl's true value.
1109 dw2_output_indirect_constants will instead call assemble_variable
1110 with dont_output_data set to 1 and then print the contents itself. */
1111 if (DECL_INITIAL (decl
) == decl
)
1114 /* If this decl is an alias, then we don't want to emit a
1116 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)))
1119 return targetm
.use_blocks_for_decl_p (decl
);
1122 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1123 have static storage duration. In other words, it should not be an
1124 automatic variable, including PARM_DECLs.
1126 There is, however, one exception: this function handles variables
1127 explicitly placed in a particular register by the user.
1129 This is never called for PARM_DECL nodes. */
1132 make_decl_rtl (tree decl
)
1134 const char *name
= 0;
1138 /* Check that we are not being given an automatic variable. */
1139 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1140 && TREE_CODE (decl
) != RESULT_DECL
);
1142 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1143 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1144 || TREE_STATIC (decl
)
1145 || TREE_PUBLIC (decl
)
1146 || DECL_EXTERNAL (decl
)
1147 || DECL_REGISTER (decl
));
1149 /* And that we were not given a type or a label. */
1150 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1151 && TREE_CODE (decl
) != LABEL_DECL
);
1153 /* For a duplicate declaration, we can be called twice on the
1154 same DECL node. Don't discard the RTL already made. */
1155 if (DECL_RTL_SET_P (decl
))
1157 /* If the old RTL had the wrong mode, fix the mode. */
1158 x
= DECL_RTL (decl
);
1159 if (GET_MODE (x
) != DECL_MODE (decl
))
1160 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1162 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1165 /* ??? Another way to do this would be to maintain a hashed
1166 table of such critters. Instead of adding stuff to a DECL
1167 to give certain attributes to it, we could use an external
1168 hash map from DECL to set of attributes. */
1170 /* Let the target reassign the RTL if it wants.
1171 This is necessary, for example, when one machine specific
1172 decl attribute overrides another. */
1173 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1175 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1176 on the new decl information. */
1178 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1179 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1180 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1182 /* Make this function static known to the mudflap runtime. */
1183 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1184 mudflap_enqueue_decl (decl
);
1189 /* If this variable belongs to the global constant pool, retrieve the
1190 pre-computed RTL or recompute it in LTO mode. */
1191 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_IN_CONSTANT_POOL (decl
))
1193 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1197 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
1199 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1200 && DECL_REGISTER (decl
))
1202 error ("register name not specified for %q+D", decl
);
1204 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1206 const char *asmspec
= name
+1;
1207 enum machine_mode mode
= DECL_MODE (decl
);
1208 reg_number
= decode_reg_name (asmspec
);
1209 /* First detect errors in declaring global registers. */
1210 if (reg_number
== -1)
1211 error ("register name not specified for %q+D", decl
);
1212 else if (reg_number
< 0)
1213 error ("invalid register name for %q+D", decl
);
1214 else if (mode
== BLKmode
)
1215 error ("data type of %q+D isn%'t suitable for a register",
1217 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1218 error ("the register specified for %q+D cannot be accessed"
1219 " by the current target", decl
);
1220 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1221 error ("the register specified for %q+D is not general enough"
1222 " to be used as a register variable", decl
);
1223 else if (!HARD_REGNO_MODE_OK (reg_number
, mode
))
1224 error ("register specified for %q+D isn%'t suitable for data type",
1226 /* Now handle properly declared static register variables. */
1231 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1233 DECL_INITIAL (decl
) = 0;
1234 error ("global register variable has initial value");
1236 if (TREE_THIS_VOLATILE (decl
))
1237 warning (OPT_Wvolatile_register_var
,
1238 "optimization may eliminate reads and/or "
1239 "writes to register variables");
1241 /* If the user specified one of the eliminables registers here,
1242 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1243 confused with that register and be eliminated. This usage is
1244 somewhat suspect... */
1246 SET_DECL_RTL (decl
, gen_rtx_raw_REG (mode
, reg_number
));
1247 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1248 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1250 if (TREE_STATIC (decl
))
1252 /* Make this register global, so not usable for anything
1254 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1255 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1256 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1258 nregs
= hard_regno_nregs
[reg_number
][mode
];
1260 globalize_reg (decl
, reg_number
+ --nregs
);
1263 /* As a register variable, it has no section. */
1267 /* Now handle ordinary static variables and functions (in memory).
1268 Also handle vars declared register invalidly. */
1269 else if (name
[0] == '*')
1271 #ifdef REGISTER_PREFIX
1272 if (strlen (REGISTER_PREFIX
) != 0)
1274 reg_number
= decode_reg_name (name
);
1275 if (reg_number
>= 0 || reg_number
== -3)
1276 error ("register name given for non-register variable %q+D", decl
);
1281 /* Specifying a section attribute on a variable forces it into a
1282 non-.bss section, and thus it cannot be common. */
1283 /* FIXME: In general this code should not be necessary because
1284 visibility pass is doing the same work. But notice_global_symbol
1285 is called early and it needs to make DECL_RTL to get the name.
1286 we take care of recomputing the DECL_RTL after visibility is changed. */
1287 if (TREE_CODE (decl
) == VAR_DECL
1288 && DECL_SECTION_NAME (decl
) != NULL_TREE
1289 && DECL_INITIAL (decl
) == NULL_TREE
1290 && DECL_COMMON (decl
))
1291 DECL_COMMON (decl
) = 0;
1293 /* Variables can't be both common and weak. */
1294 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1295 DECL_COMMON (decl
) = 0;
1297 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1298 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1301 enum machine_mode address_mode
= Pmode
;
1302 if (TREE_TYPE (decl
) != error_mark_node
)
1304 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1305 address_mode
= targetm
.addr_space
.address_mode (as
);
1307 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1309 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1310 SET_SYMBOL_REF_DECL (x
, decl
);
1312 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1313 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1314 set_mem_attributes (x
, decl
, 1);
1315 SET_DECL_RTL (decl
, x
);
1317 /* Optionally set flags or add text to the name to record information
1318 such as that it is a function name.
1319 If the name is changed, the macro ASM_OUTPUT_LABELREF
1320 will have to know how to strip this information. */
1321 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1323 /* Make this function static known to the mudflap runtime. */
1324 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1325 mudflap_enqueue_decl (decl
);
1328 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1329 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1333 make_decl_rtl_for_debug (tree decl
)
1335 unsigned int save_aliasing_flag
, save_mudflap_flag
;
1338 if (DECL_RTL_SET_P (decl
))
1339 return DECL_RTL (decl
);
1341 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1342 call new_alias_set. If running with -fcompare-debug, sometimes
1343 we do not want to create alias sets that will throw the alias
1344 numbers off in the comparison dumps. So... clearing
1345 flag_strict_aliasing will keep new_alias_set() from creating a
1346 new set. It is undesirable to register decl with mudflap
1347 in this case as well. */
1348 save_aliasing_flag
= flag_strict_aliasing
;
1349 flag_strict_aliasing
= 0;
1350 save_mudflap_flag
= flag_mudflap
;
1353 rtl
= DECL_RTL (decl
);
1354 /* Reset DECL_RTL back, as various parts of the compiler expects
1355 DECL_RTL set meaning it is actually going to be output. */
1356 SET_DECL_RTL (decl
, NULL
);
1358 flag_strict_aliasing
= save_aliasing_flag
;
1359 flag_mudflap
= save_mudflap_flag
;
1364 /* Output a string of literal assembler code
1365 for an `asm' keyword used between functions. */
1368 assemble_asm (tree string
)
1373 if (TREE_CODE (string
) == ADDR_EXPR
)
1374 string
= TREE_OPERAND (string
, 0);
1376 p
= TREE_STRING_POINTER (string
);
1377 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1380 /* Write the address of the entity given by SYMBOL to SEC. */
1382 assemble_addr_to_section (rtx symbol
, section
*sec
)
1384 switch_to_section (sec
);
1385 assemble_align (POINTER_SIZE
);
1386 assemble_integer (symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1389 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1390 not) section for PRIORITY. */
1392 get_cdtor_priority_section (int priority
, bool constructor_p
)
1396 /* ??? This only works reliably with the GNU linker. */
1397 sprintf (buf
, "%s.%.5u",
1398 constructor_p
? ".ctors" : ".dtors",
1399 /* Invert the numbering so the linker puts us in the proper
1400 order; constructors are run from right to left, and the
1401 linker sorts in increasing order. */
1402 MAX_INIT_PRIORITY
- priority
);
1403 return get_section (buf
, SECTION_WRITE
, NULL
);
1407 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1411 if (priority
!= DEFAULT_INIT_PRIORITY
)
1412 sec
= get_cdtor_priority_section (priority
,
1413 /*constructor_p=*/false);
1415 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1417 assemble_addr_to_section (symbol
, sec
);
1420 #ifdef DTORS_SECTION_ASM_OP
1422 default_dtor_section_asm_out_destructor (rtx symbol
,
1423 int priority ATTRIBUTE_UNUSED
)
1425 assemble_addr_to_section (symbol
, dtors_section
);
1430 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1434 if (priority
!= DEFAULT_INIT_PRIORITY
)
1435 sec
= get_cdtor_priority_section (priority
,
1436 /*constructor_p=*/true);
1438 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1440 assemble_addr_to_section (symbol
, sec
);
1443 #ifdef CTORS_SECTION_ASM_OP
1445 default_ctor_section_asm_out_constructor (rtx symbol
,
1446 int priority ATTRIBUTE_UNUSED
)
1448 assemble_addr_to_section (symbol
, ctors_section
);
1452 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1453 a nonzero value if the constant pool should be output before the
1454 start of the function, or a zero value if the pool should output
1455 after the end of the function. The default is to put it before the
1458 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1459 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1462 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1463 to be output to assembler.
1464 Set first_global_object_name and weak_global_object_name as appropriate. */
1467 notice_global_symbol (tree decl
)
1469 const char **type
= &first_global_object_name
;
1471 if (first_global_object_name
1472 || !TREE_PUBLIC (decl
)
1473 || DECL_EXTERNAL (decl
)
1474 || !DECL_NAME (decl
)
1475 || (TREE_CODE (decl
) != FUNCTION_DECL
1476 && (TREE_CODE (decl
) != VAR_DECL
1477 || (DECL_COMMON (decl
)
1478 && (DECL_INITIAL (decl
) == 0
1479 || DECL_INITIAL (decl
) == error_mark_node
))))
1480 || !MEM_P (DECL_RTL (decl
)))
1483 /* We win when global object is found, but it is useful to know about weak
1484 symbol as well so we can produce nicer unique names. */
1485 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1486 type
= &weak_global_object_name
;
1492 rtx decl_rtl
= DECL_RTL (decl
);
1494 p
= targetm
.strip_name_encoding (XSTR (XEXP (decl_rtl
, 0), 0));
1495 name
= ggc_strdup (p
);
1501 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1502 current function goes into the cold section, so that targets can use
1503 current_function_section during RTL expansion. DECL describes the
1507 decide_function_section (tree decl
)
1509 first_function_block_is_cold
= false;
1511 if (flag_reorder_blocks_and_partition
)
1512 /* We will decide in assemble_start_function. */
1515 if (DECL_SECTION_NAME (decl
))
1517 struct cgraph_node
*node
= cgraph_get_node (current_function_decl
);
1518 /* Calls to function_section rely on first_function_block_is_cold
1520 first_function_block_is_cold
= (node
1522 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1525 in_cold_section_p
= first_function_block_is_cold
;
1528 /* Output assembler code for the constant pool of a function and associated
1529 with defining the name of the function. DECL describes the function.
1530 NAME is the function's name. For the constant pool, we use the current
1531 constant pool data. */
1534 assemble_start_function (tree decl
, const char *fnname
)
1537 char tmp_label
[100];
1538 bool hot_label_written
= false;
1540 if (flag_reorder_blocks_and_partition
)
1542 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1543 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1544 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1545 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1546 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1547 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1548 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1549 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1554 crtl
->subsections
.hot_section_label
= NULL
;
1555 crtl
->subsections
.cold_section_label
= NULL
;
1556 crtl
->subsections
.hot_section_end_label
= NULL
;
1557 crtl
->subsections
.cold_section_end_label
= NULL
;
1560 /* The following code does not need preprocessing in the assembler. */
1564 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1565 output_constant_pool (fnname
, decl
);
1567 /* Make sure the not and cold text (code) sections are properly
1568 aligned. This is necessary here in the case where the function
1569 has both hot and cold sections, because we don't want to re-set
1570 the alignment when the section switch happens mid-function. */
1572 if (flag_reorder_blocks_and_partition
)
1574 first_function_block_is_cold
= false;
1576 switch_to_section (unlikely_text_section ());
1577 assemble_align (DECL_ALIGN (decl
));
1578 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1580 /* When the function starts with a cold section, we need to explicitly
1581 align the hot section and write out the hot section label.
1582 But if the current function is a thunk, we do not have a CFG. */
1584 && BB_PARTITION (ENTRY_BLOCK_PTR
->next_bb
) == BB_COLD_PARTITION
)
1586 switch_to_section (text_section
);
1587 assemble_align (DECL_ALIGN (decl
));
1588 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1589 hot_label_written
= true;
1590 first_function_block_is_cold
= true;
1592 in_cold_section_p
= first_function_block_is_cold
;
1596 /* Switch to the correct text section for the start of the function. */
1598 switch_to_section (function_section (decl
));
1599 if (flag_reorder_blocks_and_partition
1600 && !hot_label_written
)
1601 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1603 /* Tell assembler to move to target machine's alignment for functions. */
1604 align
= floor_log2 (DECL_ALIGN (decl
) / BITS_PER_UNIT
);
1607 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1610 /* Handle a user-specified function alignment.
1611 Note that we still need to align to DECL_ALIGN, as above,
1612 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1613 if (! DECL_USER_ALIGN (decl
)
1614 && align_functions_log
> align
1615 && optimize_function_for_speed_p (cfun
))
1617 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1618 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1619 align_functions_log
, align_functions
- 1);
1621 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1625 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1626 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1629 if (!DECL_IGNORED_P (decl
))
1630 (*debug_hooks
->begin_function
) (decl
);
1632 /* Make function name accessible from other files, if appropriate. */
1634 if (TREE_PUBLIC (decl
))
1636 notice_global_symbol (decl
);
1638 globalize_decl (decl
);
1640 maybe_assemble_visibility (decl
);
1643 if (DECL_PRESERVE_P (decl
))
1644 targetm
.asm_out
.mark_decl_preserved (fnname
);
1646 /* Do any machine/system dependent processing of the function name. */
1647 #ifdef ASM_DECLARE_FUNCTION_NAME
1648 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1650 /* Standard thing is just output label for the function. */
1651 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1652 #endif /* ASM_DECLARE_FUNCTION_NAME */
1654 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1655 saw_no_split_stack
= true;
1658 /* Output assembler code associated with defining the size of the
1659 function. DECL describes the function. NAME is the function's name. */
1662 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1664 #ifdef ASM_DECLARE_FUNCTION_SIZE
1665 /* We could have switched section in the middle of the function. */
1666 if (flag_reorder_blocks_and_partition
)
1667 switch_to_section (function_section (decl
));
1668 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1670 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1672 output_constant_pool (fnname
, decl
);
1673 switch_to_section (function_section (decl
)); /* need to switch back */
1675 /* Output labels for end of hot/cold text sections (to be used by
1677 if (flag_reorder_blocks_and_partition
)
1679 section
*save_text_section
;
1681 save_text_section
= in_section
;
1682 switch_to_section (unlikely_text_section ());
1683 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1684 if (first_function_block_is_cold
)
1685 switch_to_section (text_section
);
1687 switch_to_section (function_section (decl
));
1688 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1689 switch_to_section (save_text_section
);
1693 /* Assemble code to leave SIZE bytes of zeros. */
1696 assemble_zeros (unsigned HOST_WIDE_INT size
)
1698 /* Do no output if -fsyntax-only. */
1699 if (flag_syntax_only
)
1702 #ifdef ASM_NO_SKIP_IN_TEXT
1703 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1704 so we must output 0s explicitly in the text section. */
1705 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1707 unsigned HOST_WIDE_INT i
;
1708 for (i
= 0; i
< size
; i
++)
1709 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1714 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1717 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1720 assemble_align (int align
)
1722 if (align
> BITS_PER_UNIT
)
1724 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1728 /* Assemble a string constant with the specified C string as contents. */
1731 assemble_string (const char *p
, int size
)
1736 /* If the string is very long, split it up. */
1740 int thissize
= size
- pos
;
1741 if (thissize
> maximum
)
1744 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1752 /* A noswitch_section_callback for lcomm_section. */
1755 emit_local (tree decl ATTRIBUTE_UNUSED
,
1756 const char *name ATTRIBUTE_UNUSED
,
1757 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1758 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1760 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1761 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1762 size
, DECL_ALIGN (decl
));
1764 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1765 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1768 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1773 /* A noswitch_section_callback for bss_noswitch_section. */
1775 #if defined ASM_OUTPUT_ALIGNED_BSS
1777 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1778 const char *name ATTRIBUTE_UNUSED
,
1779 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1780 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1782 #if defined ASM_OUTPUT_ALIGNED_BSS
1783 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
, DECL_ALIGN (decl
));
1789 /* A noswitch_section_callback for comm_section. */
1792 emit_common (tree decl ATTRIBUTE_UNUSED
,
1793 const char *name ATTRIBUTE_UNUSED
,
1794 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1795 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1797 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1798 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1799 size
, DECL_ALIGN (decl
));
1801 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1802 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1805 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1810 /* A noswitch_section_callback for tls_comm_section. */
1813 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1814 const char *name ATTRIBUTE_UNUSED
,
1815 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1816 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1818 #ifdef ASM_OUTPUT_TLS_COMMON
1819 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
1822 sorry ("thread-local COMMON data not implemented");
1827 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1828 NAME is the name of DECL's SYMBOL_REF. */
1831 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
)
1833 unsigned HOST_WIDE_INT size
, rounded
;
1835 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
1838 if (flag_asan
&& asan_protect_global (decl
))
1839 size
+= asan_red_zone_size (size
);
1841 /* Don't allocate zero bytes of common,
1842 since that means "undefined external" in the linker. */
1846 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1847 so that each uninitialized object starts on such a boundary. */
1848 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
1849 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
1850 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
1852 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
1853 && (unsigned HOST_WIDE_INT
) DECL_ALIGN_UNIT (decl
) > rounded
)
1854 warning (0, "requested alignment for %q+D is greater than "
1855 "implemented alignment of %wu", decl
, rounded
);
1858 /* A subroutine of assemble_variable. Output the label and contents of
1859 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1860 is as for assemble_variable. */
1863 assemble_variable_contents (tree decl
, const char *name
,
1864 bool dont_output_data
)
1866 /* Do any machine/system dependent processing of the object. */
1867 #ifdef ASM_DECLARE_OBJECT_NAME
1868 last_assemble_variable_decl
= decl
;
1869 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
1871 /* Standard thing is just output label for the object. */
1872 ASM_OUTPUT_LABEL (asm_out_file
, name
);
1873 #endif /* ASM_DECLARE_OBJECT_NAME */
1875 if (!dont_output_data
)
1877 if (DECL_INITIAL (decl
)
1878 && DECL_INITIAL (decl
) != error_mark_node
1879 && !initializer_zerop (DECL_INITIAL (decl
)))
1880 /* Output the actual data. */
1881 output_constant (DECL_INITIAL (decl
),
1882 tree_low_cst (DECL_SIZE_UNIT (decl
), 1),
1885 /* Leave space for it. */
1886 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl
), 1));
1890 /* Assemble everything that is needed for a variable or function declaration.
1891 Not used for automatic variables, and not used for function definitions.
1892 Should not be called for variables of incomplete structure type.
1894 TOP_LEVEL is nonzero if this variable has file scope.
1895 AT_END is nonzero if this is the special handling, at end of compilation,
1896 to define things that have had only tentative definitions.
1897 DONT_OUTPUT_DATA if nonzero means don't actually output the
1898 initial value (that will be done by the caller). */
1901 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
1902 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
1905 rtx decl_rtl
, symbol
;
1907 bool asan_protected
= false;
1909 /* This function is supposed to handle VARIABLES. Ensure we have one. */
1910 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
1912 /* Emulated TLS had better not get this far. */
1913 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
1915 last_assemble_variable_decl
= 0;
1917 /* Normally no need to say anything here for external references,
1918 since assemble_external is called by the language-specific code
1919 when a declaration is first seen. */
1921 if (DECL_EXTERNAL (decl
))
1924 /* Do nothing for global register variables. */
1925 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
1927 TREE_ASM_WRITTEN (decl
) = 1;
1931 /* If type was incomplete when the variable was declared,
1932 see if it is complete now. */
1934 if (DECL_SIZE (decl
) == 0)
1935 layout_decl (decl
, 0);
1937 /* Still incomplete => don't allocate it; treat the tentative defn
1938 (which is what it must have been) as an `extern' reference. */
1940 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
1942 error ("storage size of %q+D isn%'t known", decl
);
1943 TREE_ASM_WRITTEN (decl
) = 1;
1947 /* The first declaration of a variable that comes through this function
1948 decides whether it is global (in C, has external linkage)
1949 or local (in C, has internal linkage). So do nothing more
1950 if this function has already run. */
1952 if (TREE_ASM_WRITTEN (decl
))
1955 /* Make sure targetm.encode_section_info is invoked before we set
1957 decl_rtl
= DECL_RTL (decl
);
1959 TREE_ASM_WRITTEN (decl
) = 1;
1961 /* Do no output if -fsyntax-only. */
1962 if (flag_syntax_only
)
1965 if (! dont_output_data
1966 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
1968 error ("size of variable %q+D is too large", decl
);
1972 gcc_assert (MEM_P (decl_rtl
));
1973 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
1974 symbol
= XEXP (decl_rtl
, 0);
1976 /* If this symbol belongs to the tree constant pool, output the constant
1977 if it hasn't already been written. */
1978 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
1980 tree decl
= SYMBOL_REF_DECL (symbol
);
1981 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
1982 output_constant_def_contents (symbol
);
1988 name
= XSTR (symbol
, 0);
1989 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
1990 notice_global_symbol (decl
);
1992 /* Compute the alignment of this data. */
1994 align_variable (decl
, dont_output_data
);
1997 && asan_protect_global (decl
))
1999 asan_protected
= true;
2000 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
2001 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
2004 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2006 if (TREE_PUBLIC (decl
))
2007 maybe_assemble_visibility (decl
);
2009 if (DECL_PRESERVE_P (decl
))
2010 targetm
.asm_out
.mark_decl_preserved (name
);
2012 /* First make the assembler name(s) global if appropriate. */
2013 sect
= get_variable_section (decl
, false);
2014 if (TREE_PUBLIC (decl
)
2015 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2016 globalize_decl (decl
);
2018 /* Output any data that we will need to use the address of. */
2019 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2020 output_addressed_constants (DECL_INITIAL (decl
));
2022 /* dbxout.c needs to know this. */
2023 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2024 DECL_IN_TEXT_SECTION (decl
) = 1;
2026 /* If the decl is part of an object_block, make sure that the decl
2027 has been positioned within its block, but do not write out its
2028 definition yet. output_object_blocks will do that later. */
2029 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2031 gcc_assert (!dont_output_data
);
2032 place_block_symbol (symbol
);
2034 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2035 assemble_noswitch_variable (decl
, name
, sect
);
2038 switch_to_section (sect
);
2039 if (DECL_ALIGN (decl
) > BITS_PER_UNIT
)
2040 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (DECL_ALIGN_UNIT (decl
)));
2041 assemble_variable_contents (decl
, name
, dont_output_data
);
2044 unsigned HOST_WIDE_INT
int size
2045 = tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
2046 assemble_zeros (asan_red_zone_size (size
));
2051 /* Return 1 if type TYPE contains any pointers. */
2054 contains_pointers_p (tree type
)
2056 switch (TREE_CODE (type
))
2059 case REFERENCE_TYPE
:
2060 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2061 so I'll play safe and return 1. */
2067 case QUAL_UNION_TYPE
:
2070 /* For a type that has fields, see if the fields have pointers. */
2071 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2072 if (TREE_CODE (fields
) == FIELD_DECL
2073 && contains_pointers_p (TREE_TYPE (fields
)))
2079 /* An array type contains pointers if its element type does. */
2080 return contains_pointers_p (TREE_TYPE (type
));
2087 /* We delay assemble_external processing until
2088 the compilation unit is finalized. This is the best we can do for
2089 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2090 it all the way to final. See PR 17982 for further discussion. */
2091 static GTY(()) tree pending_assemble_externals
;
2093 #ifdef ASM_OUTPUT_EXTERNAL
2094 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2095 As a result, assemble_external can be called after the list of externals
2096 is processed and the pointer set destroyed. */
2097 static bool pending_assemble_externals_processed
;
2099 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2100 TREE_LIST in assemble_external. */
2101 static struct pointer_set_t
*pending_assemble_externals_set
;
2103 /* True if DECL is a function decl for which no out-of-line copy exists.
2104 It is assumed that DECL's assembler name has been set. */
2107 incorporeal_function_p (tree decl
)
2109 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2113 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2114 && (DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
2115 || DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA_WITH_ALIGN
))
2118 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2119 /* Atomic or sync builtins which have survived this far will be
2120 resolved externally and therefore are not incorporeal. */
2121 if (strncmp (name
, "__builtin_", 10) == 0)
2127 /* Actually do the tests to determine if this is necessary, and invoke
2128 ASM_OUTPUT_EXTERNAL. */
2130 assemble_external_real (tree decl
)
2132 rtx rtl
= DECL_RTL (decl
);
2134 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2135 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2136 && !incorporeal_function_p (decl
))
2138 /* Some systems do require some output. */
2139 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2140 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2146 process_pending_assemble_externals (void)
2148 #ifdef ASM_OUTPUT_EXTERNAL
2150 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2151 assemble_external_real (TREE_VALUE (list
));
2153 pending_assemble_externals
= 0;
2154 pending_assemble_externals_processed
= true;
2155 pointer_set_destroy (pending_assemble_externals_set
);
2159 /* This TREE_LIST contains any weak symbol declarations waiting
2161 static GTY(()) tree weak_decls
;
2163 /* Output something to declare an external symbol to the assembler,
2164 and qualifiers such as weakness. (Most assemblers don't need
2165 extern declaration, so we normally output nothing.) Do nothing if
2166 DECL is not external. */
2169 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2171 /* Make sure that the ASM_OUT_FILE is open.
2172 If it's not, we should not be calling this function. */
2173 gcc_assert (asm_out_file
);
2175 /* In a perfect world, the following condition would be true.
2176 Sadly, the Java and Go front ends emit assembly *from the front end*,
2177 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2179 /* This function should only be called if we are expanding, or have
2181 Ideally, only final.c would be calling this function, but it is
2182 not clear whether that would break things somehow. See PR 17982
2183 for further discussion. */
2184 gcc_assert (cgraph_state
== CGRAPH_STATE_EXPANSION
2185 || cgraph_state
== CGRAPH_STATE_FINISHED
);
2188 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2191 /* We want to output annotation for weak and external symbols at
2192 very last to check if they are references or not. */
2194 if (TARGET_SUPPORTS_WEAK
2196 /* TREE_STATIC is a weird and abused creature which is not
2197 generally the right test for whether an entity has been
2198 locally emitted, inlined or otherwise not-really-extern, but
2199 for declarations that can be weak, it happens to be
2201 && !TREE_STATIC (decl
)
2202 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2203 && value_member (decl
, weak_decls
) == NULL_TREE
)
2204 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2206 #ifdef ASM_OUTPUT_EXTERNAL
2207 if (pending_assemble_externals_processed
)
2209 assemble_external_real (decl
);
2213 if (! pointer_set_insert (pending_assemble_externals_set
, decl
))
2214 pending_assemble_externals
= tree_cons (NULL
, decl
,
2215 pending_assemble_externals
);
2219 /* Similar, for calling a library function FUN. */
2222 assemble_external_libcall (rtx fun
)
2224 /* Declare library function name external when first used, if nec. */
2225 if (! SYMBOL_REF_USED (fun
))
2227 SYMBOL_REF_USED (fun
) = 1;
2228 targetm
.asm_out
.external_libcall (fun
);
2232 /* Assemble a label named NAME. */
2235 assemble_label (FILE *file
, const char *name
)
2237 ASM_OUTPUT_LABEL (file
, name
);
2240 /* Set the symbol_referenced flag for ID. */
2242 mark_referenced (tree id
)
2244 TREE_SYMBOL_REFERENCED (id
) = 1;
2247 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2249 mark_decl_referenced (tree decl
)
2251 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2253 /* Extern inline functions don't become needed when referenced.
2254 If we know a method will be emitted in other TU and no new
2255 functions can be marked reachable, just use the external
2257 struct cgraph_node
*node
= cgraph_get_create_node (decl
);
2258 if (!DECL_EXTERNAL (decl
)
2259 && !node
->symbol
.definition
)
2260 cgraph_mark_force_output_node (node
);
2262 else if (TREE_CODE (decl
) == VAR_DECL
)
2264 struct varpool_node
*node
= varpool_node_for_decl (decl
);
2265 /* C++ frontend use mark_decl_references to force COMDAT variables
2266 to be output that might appear dead otherwise. */
2267 node
->symbol
.force_output
= true;
2269 /* else do nothing - we can get various sorts of CST nodes here,
2270 which do not need to be marked. */
2274 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2275 until we find an identifier that is not itself a transparent alias.
2276 Modify the alias passed to it by reference (and all aliases on the
2277 way to the ultimate target), such that they do not have to be
2278 followed again, and return the ultimate target of the alias
2282 ultimate_transparent_alias_target (tree
*alias
)
2284 tree target
= *alias
;
2286 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
2288 gcc_assert (TREE_CHAIN (target
));
2289 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
2290 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
2291 && ! TREE_CHAIN (target
));
2298 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2299 starts with a *, the rest of NAME is output verbatim. Otherwise
2300 NAME is transformed in a target-specific way (usually by the
2301 addition of an underscore). */
2304 assemble_name_raw (FILE *file
, const char *name
)
2307 fputs (&name
[1], file
);
2309 ASM_OUTPUT_LABELREF (file
, name
);
2312 /* Like assemble_name_raw, but should be used when NAME might refer to
2313 an entity that is also represented as a tree (like a function or
2314 variable). If NAME does refer to such an entity, that entity will
2315 be marked as referenced. */
2318 assemble_name (FILE *file
, const char *name
)
2320 const char *real_name
;
2323 real_name
= targetm
.strip_name_encoding (name
);
2325 id
= maybe_get_identifier (real_name
);
2330 mark_referenced (id
);
2331 ultimate_transparent_alias_target (&id
);
2333 name
= IDENTIFIER_POINTER (id
);
2334 gcc_assert (! TREE_CHAIN (id
));
2337 assemble_name_raw (file
, name
);
2340 /* Allocate SIZE bytes writable static space with a gensym name
2341 and return an RTX to refer to its address. */
2344 assemble_static_space (unsigned HOST_WIDE_INT size
)
2347 const char *namestring
;
2350 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2352 namestring
= ggc_strdup (name
);
2354 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2355 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2357 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2358 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2361 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2362 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2365 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2366 so that each uninitialized object starts on such a boundary. */
2367 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2368 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2369 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2370 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2371 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2372 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2379 /* Assemble the static constant template for function entry trampolines.
2380 This is done at most once per compilation.
2381 Returns an RTX for the address of the template. */
2383 static GTY(()) rtx initial_trampoline
;
2386 assemble_trampoline_template (void)
2393 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2395 if (initial_trampoline
)
2396 return initial_trampoline
;
2398 /* By default, put trampoline templates in read-only data section. */
2400 #ifdef TRAMPOLINE_SECTION
2401 switch_to_section (TRAMPOLINE_SECTION
);
2403 switch_to_section (readonly_data_section
);
2406 /* Write the assembler code to define one. */
2407 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2409 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2411 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2412 targetm
.asm_out
.trampoline_template (asm_out_file
);
2414 /* Record the rtl to refer to it. */
2415 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2416 name
= ggc_strdup (label
);
2417 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2418 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2420 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2421 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2422 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2424 return initial_trampoline
;
2427 /* A and B are either alignments or offsets. Return the minimum alignment
2428 that may be assumed after adding the two together. */
2430 static inline unsigned
2431 min_align (unsigned int a
, unsigned int b
)
2433 return (a
| b
) & -(a
| b
);
2436 /* Return the assembler directive for creating a given kind of integer
2437 object. SIZE is the number of bytes in the object and ALIGNED_P
2438 indicates whether it is known to be aligned. Return NULL if the
2439 assembly dialect has no such directive.
2441 The returned string should be printed at the start of a new line and
2442 be followed immediately by the object's initial value. */
2445 integer_asm_op (int size
, int aligned_p
)
2447 struct asm_int_op
*ops
;
2450 ops
= &targetm
.asm_out
.aligned_op
;
2452 ops
= &targetm
.asm_out
.unaligned_op
;
2457 return targetm
.asm_out
.byte_op
;
2471 /* Use directive OP to assemble an integer object X. Print OP at the
2472 start of the line, followed immediately by the value of X. */
2475 assemble_integer_with_op (const char *op
, rtx x
)
2477 fputs (op
, asm_out_file
);
2478 output_addr_const (asm_out_file
, x
);
2479 fputc ('\n', asm_out_file
);
2482 /* The default implementation of the asm_out.integer target hook. */
2485 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2486 unsigned int size ATTRIBUTE_UNUSED
,
2487 int aligned_p ATTRIBUTE_UNUSED
)
2489 const char *op
= integer_asm_op (size
, aligned_p
);
2490 /* Avoid GAS bugs for large values. Specifically negative values whose
2491 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2492 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE
/ BITS_PER_UNIT
)
2494 return op
&& (assemble_integer_with_op (op
, x
), true);
2497 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2498 the alignment of the integer in bits. Return 1 if we were able to output
2499 the constant, otherwise 0. We must be able to output the constant,
2500 if FORCE is nonzero. */
2503 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2507 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2509 /* See if the target hook can handle this kind of object. */
2510 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2513 /* If the object is a multi-byte one, try splitting it up. Split
2514 it into words it if is multi-word, otherwise split it into bytes. */
2517 enum machine_mode omode
, imode
;
2518 unsigned int subalign
;
2519 unsigned int subsize
, i
;
2520 enum mode_class mclass
;
2522 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2523 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2524 if (GET_CODE (x
) == CONST_FIXED
)
2525 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2529 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2530 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2532 for (i
= 0; i
< size
; i
+= subsize
)
2534 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2535 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2541 /* If we've printed some of it, but not all of it, there's no going
2546 gcc_assert (!force
);
2552 assemble_real (REAL_VALUE_TYPE d
, enum machine_mode mode
, unsigned int align
)
2554 long data
[4] = {0, 0, 0, 0};
2556 int bitsize
, nelts
, nunits
, units_per
;
2558 /* This is hairy. We have a quantity of known size. real_to_target
2559 will put it into an array of *host* longs, 32 bits per element
2560 (even if long is more than 32 bits). We need to determine the
2561 number of array elements that are occupied (nelts) and the number
2562 of *target* min-addressable units that will be occupied in the
2563 object file (nunits). We cannot assume that 32 divides the
2564 mode's bitsize (size * BITS_PER_UNIT) evenly.
2566 size * BITS_PER_UNIT is used here to make sure that padding bits
2567 (which might appear at either end of the value; real_to_target
2568 will include the padding bits in its output array) are included. */
2570 nunits
= GET_MODE_SIZE (mode
);
2571 bitsize
= nunits
* BITS_PER_UNIT
;
2572 nelts
= CEIL (bitsize
, 32);
2573 units_per
= 32 / BITS_PER_UNIT
;
2575 real_to_target (data
, &d
, mode
);
2577 /* Put out the first word with the specified alignment. */
2578 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2579 nunits
-= units_per
;
2581 /* Subsequent words need only 32-bit alignment. */
2582 align
= min_align (align
, 32);
2584 for (i
= 1; i
< nelts
; i
++)
2586 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2587 nunits
-= units_per
;
2591 /* Given an expression EXP with a constant value,
2592 reduce it to the sum of an assembler symbol and an integer.
2593 Store them both in the structure *VALUE.
2594 EXP must be reducible. */
2598 HOST_WIDE_INT offset
;
2602 decode_addr_const (tree exp
, struct addr_const
*value
)
2604 tree target
= TREE_OPERAND (exp
, 0);
2610 if (TREE_CODE (target
) == COMPONENT_REF
2611 && host_integerp (byte_position (TREE_OPERAND (target
, 1)), 0))
2613 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2614 target
= TREE_OPERAND (target
, 0);
2616 else if (TREE_CODE (target
) == ARRAY_REF
2617 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2619 offset
+= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target
)), 1)
2620 * tree_low_cst (TREE_OPERAND (target
, 1), 0));
2621 target
= TREE_OPERAND (target
, 0);
2623 else if (TREE_CODE (target
) == MEM_REF
2624 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2626 offset
+= mem_ref_offset (target
).low
;
2627 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2629 else if (TREE_CODE (target
) == INDIRECT_REF
2630 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2631 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2633 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2638 switch (TREE_CODE (target
))
2642 x
= DECL_RTL (target
);
2646 x
= gen_rtx_MEM (FUNCTION_MODE
,
2647 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2656 x
= output_constant_def (target
, 1);
2663 gcc_assert (MEM_P (x
));
2667 value
->offset
= offset
;
2671 static GTY((param_is (struct constant_descriptor_tree
)))
2672 htab_t const_desc_htab
;
2674 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2676 /* Constant pool accessor function. */
2679 constant_pool_htab (void)
2681 return const_desc_htab
;
2684 /* Compute a hash code for a constant expression. */
2687 const_desc_hash (const void *ptr
)
2689 return ((const struct constant_descriptor_tree
*)ptr
)->hash
;
2693 const_hash_1 (const tree exp
)
2698 enum tree_code code
= TREE_CODE (exp
);
2700 /* Either set P and LEN to the address and len of something to hash and
2701 exit the switch or return a value. */
2706 p
= (char *) &TREE_INT_CST (exp
);
2707 len
= sizeof TREE_INT_CST (exp
);
2711 return real_hash (TREE_REAL_CST_PTR (exp
));
2714 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2717 p
= TREE_STRING_POINTER (exp
);
2718 len
= TREE_STRING_LENGTH (exp
);
2722 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2723 + const_hash_1 (TREE_IMAGPART (exp
)));
2729 hi
= 7 + VECTOR_CST_NELTS (exp
);
2731 for (i
= 0; i
< VECTOR_CST_NELTS (exp
); ++i
)
2732 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ELT (exp
, i
));
2739 unsigned HOST_WIDE_INT idx
;
2742 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2744 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2746 hi
= hi
* 603 + const_hash_1 (value
);
2754 struct addr_const value
;
2756 decode_addr_const (exp
, &value
);
2757 switch (GET_CODE (value
.base
))
2760 /* Don't hash the address of the SYMBOL_REF;
2761 only use the offset and the symbol name. */
2763 p
= XSTR (value
.base
, 0);
2764 for (i
= 0; p
[i
] != 0; i
++)
2765 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2769 hi
= value
.offset
+ CODE_LABEL_NUMBER (XEXP (value
.base
, 0)) * 13;
2779 case POINTER_PLUS_EXPR
:
2781 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2782 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2785 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2788 /* A language specific constant. Just hash the code. */
2792 /* Compute hashing function. */
2794 for (i
= 0; i
< len
; i
++)
2795 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2800 /* Wrapper of compare_constant, for the htab interface. */
2802 const_desc_eq (const void *p1
, const void *p2
)
2804 const struct constant_descriptor_tree
*const c1
2805 = (const struct constant_descriptor_tree
*) p1
;
2806 const struct constant_descriptor_tree
*const c2
2807 = (const struct constant_descriptor_tree
*) p2
;
2808 if (c1
->hash
!= c2
->hash
)
2810 return compare_constant (c1
->value
, c2
->value
);
2813 /* Compare t1 and t2, and return 1 only if they are known to result in
2814 the same bit pattern on output. */
2817 compare_constant (const tree t1
, const tree t2
)
2819 enum tree_code typecode
;
2821 if (t1
== NULL_TREE
)
2822 return t2
== NULL_TREE
;
2823 if (t2
== NULL_TREE
)
2826 if (TREE_CODE (t1
) != TREE_CODE (t2
))
2829 switch (TREE_CODE (t1
))
2832 /* Integer constants are the same only if the same width of type. */
2833 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2835 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2837 return tree_int_cst_equal (t1
, t2
);
2840 /* Real constants are the same only if the same width of type. */
2841 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2844 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
2847 /* Fixed constants are the same only if the same width of type. */
2848 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2851 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
2854 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2857 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
2858 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
2859 TREE_STRING_LENGTH (t1
)));
2862 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
2863 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
2869 if (VECTOR_CST_NELTS (t1
) != VECTOR_CST_NELTS (t2
))
2872 for (i
= 0; i
< VECTOR_CST_NELTS (t1
); ++i
)
2873 if (!compare_constant (VECTOR_CST_ELT (t1
, i
),
2874 VECTOR_CST_ELT (t2
, i
)))
2882 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
2883 unsigned HOST_WIDE_INT idx
;
2885 typecode
= TREE_CODE (TREE_TYPE (t1
));
2886 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
2889 if (typecode
== ARRAY_TYPE
)
2891 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
2892 /* For arrays, check that the sizes all match. */
2893 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
2895 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
2900 /* For record and union constructors, require exact type
2902 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
2906 v1
= CONSTRUCTOR_ELTS (t1
);
2907 v2
= CONSTRUCTOR_ELTS (t2
);
2908 if (vec_safe_length (v1
) != vec_safe_length (v2
))
2911 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
2913 constructor_elt
*c1
= &(*v1
)[idx
];
2914 constructor_elt
*c2
= &(*v2
)[idx
];
2916 /* Check that each value is the same... */
2917 if (!compare_constant (c1
->value
, c2
->value
))
2919 /* ... and that they apply to the same fields! */
2920 if (typecode
== ARRAY_TYPE
)
2922 if (!compare_constant (c1
->index
, c2
->index
))
2927 if (c1
->index
!= c2
->index
)
2938 struct addr_const value1
, value2
;
2942 decode_addr_const (t1
, &value1
);
2943 decode_addr_const (t2
, &value2
);
2945 if (value1
.offset
!= value2
.offset
)
2948 code
= GET_CODE (value1
.base
);
2949 if (code
!= GET_CODE (value2
.base
))
2955 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
2959 ret
= (CODE_LABEL_NUMBER (XEXP (value1
.base
, 0))
2960 == CODE_LABEL_NUMBER (XEXP (value2
.base
, 0)));
2970 case POINTER_PLUS_EXPR
:
2973 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
2974 && compare_constant(TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
2977 case VIEW_CONVERT_EXPR
:
2978 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
2987 /* Make a copy of the whole tree structure for a constant. This
2988 handles the same types of nodes that compare_constant handles. */
2991 copy_constant (tree exp
)
2993 switch (TREE_CODE (exp
))
2996 /* For ADDR_EXPR, we do not want to copy the decl whose address
2997 is requested. We do want to copy constants though. */
2998 if (CONSTANT_CLASS_P (TREE_OPERAND (exp
, 0)))
2999 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3000 copy_constant (TREE_OPERAND (exp
, 0)));
3002 return copy_node (exp
);
3008 return copy_node (exp
);
3011 return build_complex (TREE_TYPE (exp
),
3012 copy_constant (TREE_REALPART (exp
)),
3013 copy_constant (TREE_IMAGPART (exp
)));
3016 case POINTER_PLUS_EXPR
:
3018 return build2 (TREE_CODE (exp
), TREE_TYPE (exp
),
3019 copy_constant (TREE_OPERAND (exp
, 0)),
3020 copy_constant (TREE_OPERAND (exp
, 1)));
3023 case VIEW_CONVERT_EXPR
:
3024 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3025 copy_constant (TREE_OPERAND (exp
, 0)));
3028 return build_vector (TREE_TYPE (exp
), VECTOR_CST_ELTS (exp
));
3032 tree copy
= copy_node (exp
);
3033 vec
<constructor_elt
, va_gc
> *v
;
3034 unsigned HOST_WIDE_INT idx
;
3035 tree purpose
, value
;
3037 vec_alloc (v
, vec_safe_length (CONSTRUCTOR_ELTS (exp
)));
3038 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp
), idx
, purpose
, value
)
3040 constructor_elt ce
= {purpose
, copy_constant (value
)};
3043 CONSTRUCTOR_ELTS (copy
) = v
;
3052 /* Return the section into which constant EXP should be placed. */
3055 get_constant_section (tree exp
, unsigned int align
)
3057 return targetm
.asm_out
.select_section (exp
,
3058 compute_reloc_for_constant (exp
),
3062 /* Return the size of constant EXP in bytes. */
3064 static HOST_WIDE_INT
3065 get_constant_size (tree exp
)
3069 size
= int_size_in_bytes (TREE_TYPE (exp
));
3070 if (TREE_CODE (exp
) == STRING_CST
)
3071 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3075 /* Subroutine of output_constant_def:
3076 No constant equal to EXP is known to have been output.
3077 Make a constant descriptor to enter EXP in the hash table.
3078 Assign the label number and construct RTL to refer to the
3079 constant's location in memory.
3080 Caller is responsible for updating the hash table. */
3082 static struct constant_descriptor_tree
*
3083 build_constant_desc (tree exp
)
3085 struct constant_descriptor_tree
*desc
;
3091 desc
= ggc_alloc_constant_descriptor_tree ();
3092 desc
->value
= copy_constant (exp
);
3094 /* Propagate marked-ness to copied constant. */
3095 if (flag_mudflap
&& mf_marked_p (exp
))
3096 mf_mark (desc
->value
);
3098 /* Create a string containing the label name, in LABEL. */
3099 labelno
= const_labelno
++;
3100 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3102 /* Construct the VAR_DECL associated with the constant. */
3103 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3105 DECL_ARTIFICIAL (decl
) = 1;
3106 DECL_IGNORED_P (decl
) = 1;
3107 TREE_READONLY (decl
) = 1;
3108 TREE_STATIC (decl
) = 1;
3109 TREE_ADDRESSABLE (decl
) = 1;
3110 /* We don't set the RTL yet as this would cause varpool to assume that the
3111 variable is referenced. Moreover, it would just be dropped in LTO mode.
3112 Instead we set the flag that will be recognized in make_decl_rtl. */
3113 DECL_IN_CONSTANT_POOL (decl
) = 1;
3114 DECL_INITIAL (decl
) = desc
->value
;
3115 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3116 architectures so use DATA_ALIGNMENT as well, except for strings. */
3117 if (TREE_CODE (exp
) == STRING_CST
)
3119 #ifdef CONSTANT_ALIGNMENT
3120 DECL_ALIGN (decl
) = CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
));
3124 align_variable (decl
, 0);
3126 /* Now construct the SYMBOL_REF and the MEM. */
3127 if (use_object_blocks_p ())
3129 section
*sect
= get_constant_section (exp
, DECL_ALIGN (decl
));
3130 symbol
= create_block_symbol (ggc_strdup (label
),
3131 get_block_for_section (sect
), -1);
3134 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3135 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3136 SET_SYMBOL_REF_DECL (symbol
, decl
);
3137 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3139 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3140 set_mem_attributes (rtl
, exp
, 1);
3141 set_mem_alias_set (rtl
, 0);
3142 set_mem_alias_set (rtl
, const_alias_set
);
3144 /* We cannot share RTX'es in pool entries.
3145 Mark this piece of RTL as required for unsharing. */
3146 RTX_FLAG (rtl
, used
) = 1;
3148 /* Set flags or add text to the name to record information, such as
3149 that it is a local symbol. If the name is changed, the macro
3150 ASM_OUTPUT_LABELREF will have to know how to strip this
3151 information. This call might invalidate our local variable
3152 SYMBOL; we can't use it afterward. */
3153 targetm
.encode_section_info (exp
, rtl
, true);
3160 /* Return an rtx representing a reference to constant data in memory
3161 for the constant expression EXP.
3163 If assembler code for such a constant has already been output,
3164 return an rtx to refer to it.
3165 Otherwise, output such a constant in memory
3166 and generate an rtx for it.
3168 If DEFER is nonzero, this constant can be deferred and output only
3169 if referenced in the function after all optimizations.
3171 `const_desc_table' records which constants already have label strings. */
3174 output_constant_def (tree exp
, int defer
)
3176 struct constant_descriptor_tree
*desc
;
3177 struct constant_descriptor_tree key
;
3180 /* Look up EXP in the table of constant descriptors. If we didn't find
3181 it, create a new one. */
3183 key
.hash
= const_hash_1 (exp
);
3184 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3186 desc
= (struct constant_descriptor_tree
*) *loc
;
3189 desc
= build_constant_desc (exp
);
3190 desc
->hash
= key
.hash
;
3194 maybe_output_constant_def_contents (desc
, defer
);
3198 /* Subroutine of output_constant_def: Decide whether or not we need to
3199 output the constant DESC now, and if so, do it. */
3201 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3204 rtx symbol
= XEXP (desc
->rtl
, 0);
3205 tree exp
= desc
->value
;
3207 if (flag_syntax_only
)
3210 if (TREE_ASM_WRITTEN (exp
))
3211 /* Already output; don't do it again. */
3214 /* We can always defer constants as long as the context allows
3218 /* Increment n_deferred_constants if it exists. It needs to be at
3219 least as large as the number of constants actually referred to
3220 by the function. If it's too small we'll stop looking too early
3221 and fail to emit constants; if it's too large we'll only look
3222 through the entire function when we could have stopped earlier. */
3224 n_deferred_constants
++;
3228 output_constant_def_contents (symbol
);
3231 /* Subroutine of output_constant_def_contents. Output the definition
3232 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3233 constant's alignment in bits. */
3236 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3240 size
= get_constant_size (exp
);
3242 /* Do any machine/system dependent processing of the constant. */
3243 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3245 /* Output the value of EXP. */
3246 output_constant (exp
, size
, align
);
3249 /* We must output the constant data referred to by SYMBOL; do so. */
3252 output_constant_def_contents (rtx symbol
)
3254 tree decl
= SYMBOL_REF_DECL (symbol
);
3255 tree exp
= DECL_INITIAL (decl
);
3257 bool asan_protected
= false;
3259 /* Make sure any other constants whose addresses appear in EXP
3260 are assigned label numbers. */
3261 output_addressed_constants (exp
);
3263 /* We are no longer deferring this constant. */
3264 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3266 if (flag_asan
&& TREE_CODE (exp
) == STRING_CST
3267 && asan_protect_global (exp
))
3269 asan_protected
= true;
3270 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
3271 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
3274 /* If the constant is part of an object block, make sure that the
3275 decl has been positioned within its block, but do not write out
3276 its definition yet. output_object_blocks will do that later. */
3277 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3278 place_block_symbol (symbol
);
3281 align
= DECL_ALIGN (decl
);
3282 switch_to_section (get_constant_section (exp
, align
));
3283 if (align
> BITS_PER_UNIT
)
3284 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3285 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3288 HOST_WIDE_INT size
= get_constant_size (exp
);
3289 assemble_zeros (asan_red_zone_size (size
));
3293 mudflap_enqueue_constant (exp
);
3296 /* Look up EXP in the table of constant descriptors. Return the rtl
3297 if it has been emitted, else null. */
3300 lookup_constant_def (tree exp
)
3302 struct constant_descriptor_tree
*desc
;
3303 struct constant_descriptor_tree key
;
3306 key
.hash
= const_hash_1 (exp
);
3307 desc
= (struct constant_descriptor_tree
*)
3308 htab_find_with_hash (const_desc_htab
, &key
, key
.hash
);
3310 return (desc
? desc
->rtl
: NULL_RTX
);
3313 /* Return a tree representing a reference to constant data in memory
3314 for the constant expression EXP.
3316 This is the counterpart of output_constant_def at the Tree level. */
3319 tree_output_constant_def (tree exp
)
3321 struct constant_descriptor_tree
*desc
, key
;
3325 /* Look up EXP in the table of constant descriptors. If we didn't find
3326 it, create a new one. */
3328 key
.hash
= const_hash_1 (exp
);
3329 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3331 desc
= (struct constant_descriptor_tree
*) *loc
;
3334 desc
= build_constant_desc (exp
);
3335 desc
->hash
= key
.hash
;
3339 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3340 varpool_finalize_decl (decl
);
3344 /* Used in the hash tables to avoid outputting the same constant
3345 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3346 are output once per function, not once per file. */
3347 /* ??? Only a few targets need per-function constant pools. Most
3348 can use one per-file pool. Should add a targetm bit to tell the
3351 struct GTY(()) rtx_constant_pool
{
3352 /* Pointers to first and last constant in pool, as ordered by offset. */
3353 struct constant_descriptor_rtx
*first
;
3354 struct constant_descriptor_rtx
*last
;
3356 /* Hash facility for making memory-constants from constant rtl-expressions.
3357 It is used on RISC machines where immediate integer arguments and
3358 constant addresses are restricted so that such constants must be stored
3360 htab_t
GTY((param_is (struct constant_descriptor_rtx
))) const_rtx_htab
;
3362 /* Current offset in constant pool (does not include any
3363 machine-specific header). */
3364 HOST_WIDE_INT offset
;
3367 struct GTY((chain_next ("%h.next"))) constant_descriptor_rtx
{
3368 struct constant_descriptor_rtx
*next
;
3372 HOST_WIDE_INT offset
;
3374 enum machine_mode mode
;
3380 /* Hash and compare functions for const_rtx_htab. */
3383 const_desc_rtx_hash (const void *ptr
)
3385 const struct constant_descriptor_rtx
*const desc
3386 = (const struct constant_descriptor_rtx
*) ptr
;
3391 const_desc_rtx_eq (const void *a
, const void *b
)
3393 const struct constant_descriptor_rtx
*const x
3394 = (const struct constant_descriptor_rtx
*) a
;
3395 const struct constant_descriptor_rtx
*const y
3396 = (const struct constant_descriptor_rtx
*) b
;
3398 if (x
->mode
!= y
->mode
)
3400 return rtx_equal_p (x
->constant
, y
->constant
);
3403 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3406 const_rtx_hash_1 (rtx
*xp
, void *data
)
3408 unsigned HOST_WIDE_INT hwi
;
3409 enum machine_mode mode
;
3415 code
= GET_CODE (x
);
3416 mode
= GET_MODE (x
);
3417 h
= (hashval_t
) code
* 1048573 + mode
;
3425 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3426 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3429 h
^= (hashval_t
) hwi
;
3430 for (i
= 1; i
< n
; ++i
)
3433 h
^= (hashval_t
) hwi
;
3439 if (mode
== VOIDmode
)
3441 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3445 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3449 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3455 for (i
= XVECLEN (x
, 0); i
-- > 0; )
3456 h
= h
* 251 + const_rtx_hash_1 (&XVECEXP (x
, 0, i
), data
);
3461 h
^= htab_hash_string (XSTR (x
, 0));
3465 h
= h
* 251 + CODE_LABEL_NUMBER (XEXP (x
, 0));
3469 case UNSPEC_VOLATILE
:
3470 h
= h
* 251 + XINT (x
, 1);
3477 hp
= (hashval_t
*) data
;
3478 *hp
= *hp
* 509 + h
;
3482 /* Compute a hash value for X, which should be a constant. */
3485 const_rtx_hash (rtx x
)
3488 for_each_rtx (&x
, const_rtx_hash_1
, &h
);
3493 /* Create and return a new rtx constant pool. */
3495 static struct rtx_constant_pool
*
3496 create_constant_pool (void)
3498 struct rtx_constant_pool
*pool
;
3500 pool
= ggc_alloc_rtx_constant_pool ();
3501 pool
->const_rtx_htab
= htab_create_ggc (31, const_desc_rtx_hash
,
3502 const_desc_rtx_eq
, NULL
);
3509 /* Initialize constant pool hashing for a new function. */
3512 init_varasm_status (void)
3514 crtl
->varasm
.pool
= create_constant_pool ();
3515 crtl
->varasm
.deferred_constants
= 0;
3518 /* Given a MINUS expression, simplify it if both sides
3519 include the same symbol. */
3522 simplify_subtraction (rtx x
)
3524 rtx r
= simplify_rtx (x
);
3528 /* Given a constant rtx X, make (or find) a memory constant for its value
3529 and return a MEM rtx to refer to it in memory. */
3532 force_const_mem (enum machine_mode mode
, rtx x
)
3534 struct constant_descriptor_rtx
*desc
, tmp
;
3535 struct rtx_constant_pool
*pool
;
3542 /* If we're not allowed to drop X into the constant pool, don't. */
3543 if (targetm
.cannot_force_const_mem (mode
, x
))
3546 /* Record that this function has used a constant pool entry. */
3547 crtl
->uses_const_pool
= 1;
3549 /* Decide which pool to use. */
3550 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3551 ? shared_constant_pool
3552 : crtl
->varasm
.pool
);
3554 /* Lookup the value in the hashtable. */
3557 hash
= const_rtx_hash (x
);
3558 slot
= htab_find_slot_with_hash (pool
->const_rtx_htab
, &tmp
, hash
, INSERT
);
3559 desc
= (struct constant_descriptor_rtx
*) *slot
;
3561 /* If the constant was already present, return its memory. */
3563 return copy_rtx (desc
->mem
);
3565 /* Otherwise, create a new descriptor. */
3566 desc
= ggc_alloc_constant_descriptor_rtx ();
3569 /* Align the location counter as required by EXP's data type. */
3570 gcc_checking_assert (mode
!= VOIDmode
&& mode
!= BLKmode
);
3571 align
= GET_MODE_ALIGNMENT (mode
);
3572 #ifdef CONSTANT_ALIGNMENT
3574 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3575 if (type
!= NULL_TREE
)
3576 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3580 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3581 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3584 desc
->constant
= copy_rtx (tmp
.constant
);
3585 desc
->offset
= pool
->offset
;
3588 desc
->align
= align
;
3589 desc
->labelno
= const_labelno
;
3592 pool
->offset
+= GET_MODE_SIZE (mode
);
3594 pool
->last
->next
= desc
;
3596 pool
->first
= pool
->last
= desc
;
3599 /* Create a string containing the label name, in LABEL. */
3600 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3603 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3604 the constants pool. */
3605 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3607 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3608 symbol
= create_block_symbol (ggc_strdup (label
),
3609 get_block_for_section (sect
), -1);
3612 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3614 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3615 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3616 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3618 /* Construct the MEM. */
3619 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3620 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3621 set_mem_align (def
, align
);
3623 /* If we're dropping a label to the constant pool, make sure we
3625 if (GET_CODE (x
) == LABEL_REF
)
3626 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3628 return copy_rtx (def
);
3631 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3634 get_pool_constant (rtx addr
)
3636 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3639 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3640 and whether it has been output or not. */
3643 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3645 struct constant_descriptor_rtx
*desc
;
3647 desc
= SYMBOL_REF_CONSTANT (addr
);
3648 *pmarked
= (desc
->mark
!= 0);
3649 return desc
->constant
;
3652 /* Similar, return the mode. */
3655 get_pool_mode (const_rtx addr
)
3657 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3660 /* Return the size of the constant pool. */
3663 get_pool_size (void)
3665 return crtl
->varasm
.pool
->offset
;
3668 /* Worker function for output_constant_pool_1. Emit assembly for X
3669 in MODE with known alignment ALIGN. */
3672 output_constant_pool_2 (enum machine_mode mode
, rtx x
, unsigned int align
)
3674 switch (GET_MODE_CLASS (mode
))
3677 case MODE_DECIMAL_FLOAT
:
3681 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3682 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3683 assemble_real (r
, mode
, align
);
3688 case MODE_PARTIAL_INT
:
3693 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3696 case MODE_VECTOR_FLOAT
:
3697 case MODE_VECTOR_INT
:
3698 case MODE_VECTOR_FRACT
:
3699 case MODE_VECTOR_UFRACT
:
3700 case MODE_VECTOR_ACCUM
:
3701 case MODE_VECTOR_UACCUM
:
3704 enum machine_mode submode
= GET_MODE_INNER (mode
);
3705 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3707 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3708 units
= CONST_VECTOR_NUNITS (x
);
3710 for (i
= 0; i
< units
; i
++)
3712 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3713 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3723 /* Worker function for output_constant_pool. Emit constant DESC,
3724 giving it ALIGN bits of alignment. */
3727 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3734 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3735 whose CODE_LABEL has been deleted. This can occur if a jump table
3736 is eliminated by optimization. If so, write a constant of zero
3737 instead. Note that this can also happen by turning the
3738 CODE_LABEL into a NOTE. */
3739 /* ??? This seems completely and utterly wrong. Certainly it's
3740 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3741 functioning even with INSN_DELETED_P and friends. */
3744 switch (GET_CODE (tmp
))
3747 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3748 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3750 tmp
= XEXP (XEXP (tmp
, 0), 0);
3754 tmp
= XEXP (tmp
, 0);
3755 gcc_assert (!INSN_DELETED_P (tmp
));
3756 gcc_assert (!NOTE_P (tmp
)
3757 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3764 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3765 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3766 align
, desc
->labelno
, done
);
3769 assemble_align (align
);
3771 /* Output the label. */
3772 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3774 /* Output the data. */
3775 output_constant_pool_2 (desc
->mode
, x
, align
);
3777 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3778 sections have proper size. */
3779 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3781 && (in_section
->common
.flags
& SECTION_MERGE
))
3782 assemble_align (align
);
3784 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3790 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3791 to as used. Emit referenced deferred strings. This function can
3792 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3795 mark_constant (rtx
*current_rtx
, void *data ATTRIBUTE_UNUSED
)
3797 rtx x
= *current_rtx
;
3799 if (x
== NULL_RTX
|| GET_CODE (x
) != SYMBOL_REF
)
3802 if (CONSTANT_POOL_ADDRESS_P (x
))
3804 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3805 if (desc
->mark
== 0)
3808 for_each_rtx (&desc
->constant
, mark_constant
, NULL
);
3811 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3813 tree decl
= SYMBOL_REF_DECL (x
);
3814 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
3816 n_deferred_constants
--;
3817 output_constant_def_contents (x
);
3824 /* Look through appropriate parts of INSN, marking all entries in the
3825 constant pool which are actually being used. Entries that are only
3826 referenced by other constants are also marked as used. Emit
3827 deferred strings that are used. */
3830 mark_constants (rtx insn
)
3835 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3836 insns, not any notes that may be attached. We don't want to mark
3837 a constant just because it happens to appear in a REG_EQUIV note. */
3838 if (GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3840 rtx seq
= PATTERN (insn
);
3841 int i
, n
= XVECLEN (seq
, 0);
3842 for (i
= 0; i
< n
; ++i
)
3844 rtx subinsn
= XVECEXP (seq
, 0, i
);
3845 if (INSN_P (subinsn
))
3846 for_each_rtx (&PATTERN (subinsn
), mark_constant
, NULL
);
3850 for_each_rtx (&PATTERN (insn
), mark_constant
, NULL
);
3853 /* Look through the instructions for this function, and mark all the
3854 entries in POOL which are actually being used. Emit deferred constants
3855 which have indeed been used. */
3858 mark_constant_pool (void)
3862 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
3865 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3866 mark_constants (insn
);
3869 /* Write all the constants in POOL. */
3872 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
3874 struct constant_descriptor_rtx
*desc
;
3876 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3879 /* If the constant is part of an object_block, make sure that
3880 the constant has been positioned within its block, but do not
3881 write out its definition yet. output_object_blocks will do
3883 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
3884 && SYMBOL_REF_BLOCK (desc
->sym
))
3885 place_block_symbol (desc
->sym
);
3888 switch_to_section (targetm
.asm_out
.select_rtx_section
3889 (desc
->mode
, desc
->constant
, desc
->align
));
3890 output_constant_pool_1 (desc
, desc
->align
);
3895 /* Mark all constants that are used in the current function, then write
3896 out the function's private constant pool. */
3899 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
3900 tree fndecl ATTRIBUTE_UNUSED
)
3902 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
3904 /* It is possible for gcc to call force_const_mem and then to later
3905 discard the instructions which refer to the constant. In such a
3906 case we do not need to output the constant. */
3907 mark_constant_pool ();
3909 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3910 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3913 output_constant_pool_contents (pool
);
3915 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3916 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3920 /* Write the contents of the shared constant pool. */
3923 output_shared_constant_pool (void)
3925 output_constant_pool_contents (shared_constant_pool
);
3928 /* Determine what kind of relocations EXP may need. */
3931 compute_reloc_for_constant (tree exp
)
3933 int reloc
= 0, reloc2
;
3936 switch (TREE_CODE (exp
))
3940 /* Go inside any operations that get_inner_reference can handle and see
3941 if what's inside is a constant: no need to do anything here for
3942 addresses of variables or functions. */
3943 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3944 tem
= TREE_OPERAND (tem
, 0))
3947 if (TREE_CODE (tem
) == MEM_REF
3948 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
3950 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
3954 if (TREE_PUBLIC (tem
))
3961 case POINTER_PLUS_EXPR
:
3962 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3963 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3967 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3968 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3969 /* The difference of two local labels is computable at link time. */
3970 if (reloc
== 1 && reloc2
== 1)
3977 case VIEW_CONVERT_EXPR
:
3978 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3983 unsigned HOST_WIDE_INT idx
;
3984 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
3986 reloc
|= compute_reloc_for_constant (tem
);
3996 /* Find all the constants whose addresses are referenced inside of EXP,
3997 and make sure assembler code with a label has been output for each one.
3998 Indicate whether an ADDR_EXPR has been encountered. */
4001 output_addressed_constants (tree exp
)
4005 switch (TREE_CODE (exp
))
4009 /* Go inside any operations that get_inner_reference can handle and see
4010 if what's inside is a constant: no need to do anything here for
4011 addresses of variables or functions. */
4012 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4013 tem
= TREE_OPERAND (tem
, 0))
4016 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4017 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4018 tem
= DECL_INITIAL (tem
);
4020 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4021 output_constant_def (tem
, 0);
4023 if (TREE_CODE (tem
) == MEM_REF
)
4024 output_addressed_constants (TREE_OPERAND (tem
, 0));
4028 case POINTER_PLUS_EXPR
:
4030 output_addressed_constants (TREE_OPERAND (exp
, 1));
4034 case VIEW_CONVERT_EXPR
:
4035 output_addressed_constants (TREE_OPERAND (exp
, 0));
4040 unsigned HOST_WIDE_INT idx
;
4041 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4043 output_addressed_constants (tem
);
4052 /* Whether a constructor CTOR is a valid static constant initializer if all
4053 its elements are. This used to be internal to initializer_constant_valid_p
4054 and has been exposed to let other functions like categorize_ctor_elements
4055 evaluate the property while walking a constructor for other purposes. */
4058 constructor_static_from_elts_p (const_tree ctor
)
4060 return (TREE_CONSTANT (ctor
)
4061 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4062 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4063 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4066 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4069 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4070 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4071 which are valid when ENDTYPE is an integer of any size; in
4072 particular, this does not accept a pointer minus a constant. This
4073 returns null_pointer_node if the VALUE is an absolute constant
4074 which can be used to initialize a static variable. Otherwise it
4078 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4082 if (!INTEGRAL_TYPE_P (endtype
))
4085 op0
= TREE_OPERAND (value
, 0);
4086 op1
= TREE_OPERAND (value
, 1);
4088 /* Like STRIP_NOPS except allow the operand mode to widen. This
4089 works around a feature of fold that simplifies (int)(p1 - p2) to
4090 ((int)p1 - (int)p2) under the theory that the narrower operation
4093 while (CONVERT_EXPR_P (op0
)
4094 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4096 tree inner
= TREE_OPERAND (op0
, 0);
4097 if (inner
== error_mark_node
4098 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4099 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4100 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4105 while (CONVERT_EXPR_P (op1
)
4106 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4108 tree inner
= TREE_OPERAND (op1
, 0);
4109 if (inner
== error_mark_node
4110 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4111 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4112 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4117 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4121 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4122 cache
? cache
+ 2 : NULL
);
4123 /* Both initializers must be known. */
4127 && (op0
== null_pointer_node
4128 || TREE_CODE (value
) == MINUS_EXPR
))
4129 return null_pointer_node
;
4131 /* Support differences between labels. */
4132 if (TREE_CODE (op0
) == LABEL_DECL
4133 && TREE_CODE (op1
) == LABEL_DECL
)
4134 return null_pointer_node
;
4136 if (TREE_CODE (op0
) == STRING_CST
4137 && TREE_CODE (op1
) == STRING_CST
4138 && operand_equal_p (op0
, op1
, 1))
4139 return null_pointer_node
;
4145 /* Helper function of initializer_constant_valid_p.
4146 Return nonzero if VALUE is a valid constant-valued expression
4147 for use in initializing a static variable; one that can be an
4148 element of a "constant" initializer.
4150 Return null_pointer_node if the value is absolute;
4151 if it is relocatable, return the variable that determines the relocation.
4152 We assume that VALUE has been folded as much as possible;
4153 therefore, we do not need to check for such things as
4154 arithmetic-combinations of integers.
4156 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4159 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4163 switch (TREE_CODE (value
))
4166 if (constructor_static_from_elts_p (value
))
4168 unsigned HOST_WIDE_INT idx
;
4170 bool absolute
= true;
4172 if (cache
&& cache
[0] == value
)
4174 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4177 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4184 cache
[1] = NULL_TREE
;
4188 if (reloc
!= null_pointer_node
)
4191 /* For a non-absolute relocation, there is no single
4192 variable that can be "the variable that determines the
4197 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4199 return absolute
? null_pointer_node
: error_mark_node
;
4202 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4210 return null_pointer_node
;
4215 tree op0
= staticp (TREE_OPERAND (value
, 0));
4218 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4219 to be a constant, this is old-skool offsetof-like nonsense. */
4220 if (TREE_CODE (op0
) == INDIRECT_REF
4221 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4222 return null_pointer_node
;
4223 /* Taking the address of a nested function involves a trampoline,
4224 unless we don't need or want one. */
4225 if (TREE_CODE (op0
) == FUNCTION_DECL
4226 && DECL_STATIC_CHAIN (op0
)
4227 && !TREE_NO_TRAMPOLINE (value
))
4229 /* "&{...}" requires a temporary to hold the constructed
4231 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4237 case NON_LVALUE_EXPR
:
4238 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4241 case VIEW_CONVERT_EXPR
:
4243 tree src
= TREE_OPERAND (value
, 0);
4244 tree src_type
= TREE_TYPE (src
);
4245 tree dest_type
= TREE_TYPE (value
);
4247 /* Allow view-conversions from aggregate to non-aggregate type only
4248 if the bit pattern is fully preserved afterwards; otherwise, the
4249 RTL expander won't be able to apply a subsequent transformation
4250 to the underlying constructor. */
4251 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4253 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4254 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4259 /* Allow all other kinds of view-conversion. */
4260 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4265 tree src
= TREE_OPERAND (value
, 0);
4266 tree src_type
= TREE_TYPE (src
);
4267 tree dest_type
= TREE_TYPE (value
);
4269 /* Allow conversions between pointer types, floating-point
4270 types, and offset types. */
4271 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4272 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4273 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4274 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4275 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4277 /* Allow length-preserving conversions between integer types. */
4278 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4279 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4280 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4282 /* Allow conversions between other integer types only if
4284 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4286 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4287 if (inner
== null_pointer_node
)
4288 return null_pointer_node
;
4292 /* Allow (int) &foo provided int is as wide as a pointer. */
4293 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4294 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4295 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4297 /* Likewise conversions from int to pointers, but also allow
4298 conversions from 0. */
4299 if ((POINTER_TYPE_P (dest_type
)
4300 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4301 && INTEGRAL_TYPE_P (src_type
))
4303 if (TREE_CODE (src
) == INTEGER_CST
4304 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4305 return null_pointer_node
;
4306 if (integer_zerop (src
))
4307 return null_pointer_node
;
4308 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4309 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4312 /* Allow conversions to struct or union types if the value
4314 if (TREE_CODE (dest_type
) == RECORD_TYPE
4315 || TREE_CODE (dest_type
) == UNION_TYPE
)
4316 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4320 case POINTER_PLUS_EXPR
:
4322 /* Any valid floating-point constants will have been folded by now;
4323 with -frounding-math we hit this with addition of two constants. */
4324 if (TREE_CODE (endtype
) == REAL_TYPE
)
4326 if (cache
&& cache
[0] == value
)
4328 if (! INTEGRAL_TYPE_P (endtype
)
4329 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4331 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4333 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4336 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4337 endtype
, ncache
+ 2);
4338 /* If either term is absolute, use the other term's relocation. */
4339 if (valid0
== null_pointer_node
)
4341 else if (valid1
== null_pointer_node
)
4343 /* Support narrowing pointer differences. */
4345 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4349 /* Support narrowing pointer differences. */
4350 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4359 if (TREE_CODE (endtype
) == REAL_TYPE
)
4361 if (cache
&& cache
[0] == value
)
4363 if (! INTEGRAL_TYPE_P (endtype
)
4364 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4366 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4368 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4371 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4372 endtype
, ncache
+ 2);
4373 /* Win if second argument is absolute. */
4374 if (valid1
== null_pointer_node
)
4376 /* Win if both arguments have the same relocation.
4377 Then the value is absolute. */
4378 else if (valid0
== valid1
&& valid0
!= 0)
4379 ret
= null_pointer_node
;
4380 /* Since GCC guarantees that string constants are unique in the
4381 generated code, a subtraction between two copies of the same
4382 constant string is absolute. */
4383 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4384 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4385 && operand_equal_p (valid0
, valid1
, 1))
4386 ret
= null_pointer_node
;
4387 /* Support narrowing differences. */
4389 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4393 /* Support narrowing differences. */
4394 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4409 /* Return nonzero if VALUE is a valid constant-valued expression
4410 for use in initializing a static variable; one that can be an
4411 element of a "constant" initializer.
4413 Return null_pointer_node if the value is absolute;
4414 if it is relocatable, return the variable that determines the relocation.
4415 We assume that VALUE has been folded as much as possible;
4416 therefore, we do not need to check for such things as
4417 arithmetic-combinations of integers. */
4419 initializer_constant_valid_p (tree value
, tree endtype
)
4421 return initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4424 /* Return true if VALUE is a valid constant-valued expression
4425 for use in initializing a static bit-field; one that can be
4426 an element of a "constant" initializer. */
4429 initializer_constant_valid_for_bitfield_p (tree value
)
4431 /* For bitfields we support integer constants or possibly nested aggregates
4433 switch (TREE_CODE (value
))
4437 unsigned HOST_WIDE_INT idx
;
4440 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4441 if (!initializer_constant_valid_for_bitfield_p (elt
))
4450 case VIEW_CONVERT_EXPR
:
4451 case NON_LVALUE_EXPR
:
4453 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4462 /* output_constructor outer state of relevance in recursive calls, typically
4463 for nested aggregate bitfields. */
4466 unsigned int bit_offset
; /* current position in ... */
4467 int byte
; /* ... the outer byte buffer. */
4470 static unsigned HOST_WIDE_INT
4471 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int,
4474 /* Output assembler code for constant EXP to FILE, with no label.
4475 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4476 Assumes output_addressed_constants has been done on EXP already.
4478 Generate exactly SIZE bytes of assembler data, padding at the end
4479 with zeros if necessary. SIZE must always be specified.
4481 SIZE is important for structure constructors,
4482 since trailing members may have been omitted from the constructor.
4483 It is also important for initialization of arrays from string constants
4484 since the full length of the string constant might not be wanted.
4485 It is also needed for initialization of unions, where the initializer's
4486 type is just one member, and that may not be as long as the union.
4488 There a case in which we would fail to output exactly SIZE bytes:
4489 for a structure constructor that wants to produce more than SIZE bytes.
4490 But such constructors will never be generated for any possible input.
4492 ALIGN is the alignment of the data in bits. */
4495 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4497 enum tree_code code
;
4498 unsigned HOST_WIDE_INT thissize
;
4500 if (size
== 0 || flag_syntax_only
)
4503 /* See if we're trying to initialize a pointer in a non-default mode
4504 to the address of some declaration somewhere. If the target says
4505 the mode is valid for pointers, assume the target has a way of
4507 if (TREE_CODE (exp
) == NOP_EXPR
4508 && POINTER_TYPE_P (TREE_TYPE (exp
))
4509 && targetm
.addr_space
.valid_pointer_mode
4510 (TYPE_MODE (TREE_TYPE (exp
)),
4511 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4513 tree saved_type
= TREE_TYPE (exp
);
4515 /* Peel off any intermediate conversions-to-pointer for valid
4517 while (TREE_CODE (exp
) == NOP_EXPR
4518 && POINTER_TYPE_P (TREE_TYPE (exp
))
4519 && targetm
.addr_space
.valid_pointer_mode
4520 (TYPE_MODE (TREE_TYPE (exp
)),
4521 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4522 exp
= TREE_OPERAND (exp
, 0);
4524 /* If what we're left with is the address of something, we can
4525 convert the address to the final type and output it that
4527 if (TREE_CODE (exp
) == ADDR_EXPR
)
4528 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4529 /* Likewise for constant ints. */
4530 else if (TREE_CODE (exp
) == INTEGER_CST
)
4531 exp
= build_int_cst_wide (saved_type
, TREE_INT_CST_LOW (exp
),
4532 TREE_INT_CST_HIGH (exp
));
4536 /* Eliminate any conversions since we'll be outputting the underlying
4538 while (CONVERT_EXPR_P (exp
)
4539 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4540 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4542 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4543 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4545 /* Make sure eliminating the conversion is really a no-op, except with
4546 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4547 union types to allow for Ada unchecked unions. */
4548 if (type_size
> op_size
4549 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4550 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4551 /* Keep the conversion. */
4554 exp
= TREE_OPERAND (exp
, 0);
4557 code
= TREE_CODE (TREE_TYPE (exp
));
4558 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4560 /* Allow a constructor with no elements for any data type.
4561 This means to fill the space with zeros. */
4562 if (TREE_CODE (exp
) == CONSTRUCTOR
4563 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4565 assemble_zeros (size
);
4569 if (TREE_CODE (exp
) == FDESC_EXPR
)
4571 #ifdef ASM_OUTPUT_FDESC
4572 HOST_WIDE_INT part
= tree_low_cst (TREE_OPERAND (exp
, 1), 0);
4573 tree decl
= TREE_OPERAND (exp
, 0);
4574 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4581 /* Now output the underlying data. If we've handling the padding, return.
4582 Otherwise, break and ensure SIZE is the size written. */
4589 case REFERENCE_TYPE
:
4591 case FIXED_POINT_TYPE
:
4592 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4593 EXPAND_INITIALIZER
),
4594 MIN (size
, thissize
), align
, 0))
4595 error ("initializer for integer/fixed-point value is too complicated");
4599 if (TREE_CODE (exp
) != REAL_CST
)
4600 error ("initializer for floating value is not a floating constant");
4602 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4606 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4607 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4608 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4613 switch (TREE_CODE (exp
))
4616 output_constructor (exp
, size
, align
, NULL
);
4620 = MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
), size
);
4621 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4625 enum machine_mode inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4626 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4627 int elt_size
= GET_MODE_SIZE (inner
);
4628 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
);
4629 thissize
= elt_size
;
4630 for (unsigned int i
= 1; i
< VECTOR_CST_NELTS (exp
); i
++)
4632 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
);
4633 thissize
+= elt_size
;
4644 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4645 output_constructor (exp
, size
, align
, NULL
);
4655 if (size
> thissize
)
4656 assemble_zeros (size
- thissize
);
4660 /* Subroutine of output_constructor, used for computing the size of
4661 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4662 type with an unspecified upper bound. */
4664 static unsigned HOST_WIDE_INT
4665 array_size_for_constructor (tree val
)
4668 unsigned HOST_WIDE_INT cnt
;
4669 tree index
, value
, tmp
;
4672 /* This code used to attempt to handle string constants that are not
4673 arrays of single-bytes, but nothing else does, so there's no point in
4675 if (TREE_CODE (val
) == STRING_CST
)
4676 return TREE_STRING_LENGTH (val
);
4678 max_index
= NULL_TREE
;
4679 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4681 if (TREE_CODE (index
) == RANGE_EXPR
)
4682 index
= TREE_OPERAND (index
, 1);
4683 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4687 if (max_index
== NULL_TREE
)
4690 /* Compute the total number of array elements. */
4691 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4692 i
= tree_to_double_int (max_index
) - tree_to_double_int (tmp
);
4693 i
+= double_int_one
;
4695 /* Multiply by the array element unit size to find number of bytes. */
4696 i
*= tree_to_double_int (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4698 gcc_assert (i
.fits_uhwi ());
4702 /* Other datastructures + helpers for output_constructor. */
4704 /* output_constructor local state to support interaction with helpers. */
4708 /* Received arguments. */
4709 tree exp
; /* Constructor expression. */
4710 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4711 unsigned int align
; /* Known initial alignment. */
4713 /* Constructor expression data. */
4714 tree type
; /* Expression type. */
4715 tree field
; /* Current field decl in a record. */
4716 tree min_index
; /* Lower bound if specified for an array. */
4718 /* Output processing state. */
4719 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4720 bool byte_buffer_in_use
; /* Whether byte ... */
4721 int byte
; /* ... contains part of a bitfield byte yet to
4724 int last_relative_index
; /* Implicit or explicit index of the last
4725 array element output within a bitfield. */
4726 /* Current element. */
4727 tree val
; /* Current element value. */
4728 tree index
; /* Current element index. */
4732 /* Helper for output_constructor. From the current LOCAL state, output a
4733 RANGE_EXPR element. */
4736 output_constructor_array_range (oc_local_state
*local
)
4738 unsigned HOST_WIDE_INT fieldsize
4739 = int_size_in_bytes (TREE_TYPE (local
->type
));
4741 HOST_WIDE_INT lo_index
4742 = tree_low_cst (TREE_OPERAND (local
->index
, 0), 0);
4743 HOST_WIDE_INT hi_index
4744 = tree_low_cst (TREE_OPERAND (local
->index
, 1), 0);
4745 HOST_WIDE_INT index
;
4748 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4750 for (index
= lo_index
; index
<= hi_index
; index
++)
4752 /* Output the element's initial value. */
4753 if (local
->val
== NULL_TREE
)
4754 assemble_zeros (fieldsize
);
4756 output_constant (local
->val
, fieldsize
, align2
);
4758 /* Count its size. */
4759 local
->total_bytes
+= fieldsize
;
4763 /* Helper for output_constructor. From the current LOCAL state, output a
4764 field element that is not true bitfield or part of an outer one. */
4767 output_constructor_regular_field (oc_local_state
*local
)
4769 /* Field size and position. Since this structure is static, we know the
4770 positions are constant. */
4771 unsigned HOST_WIDE_INT fieldsize
;
4772 HOST_WIDE_INT fieldpos
;
4774 unsigned int align2
;
4776 if (local
->index
!= NULL_TREE
)
4778 /* Perform the index calculation in modulo arithmetic but
4779 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4780 but we are using an unsigned sizetype. */
4781 unsigned prec
= TYPE_PRECISION (sizetype
);
4782 double_int idx
= tree_to_double_int (local
->index
)
4783 - tree_to_double_int (local
->min_index
);
4784 idx
= idx
.sext (prec
);
4785 fieldpos
= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
)), 1)
4788 else if (local
->field
!= NULL_TREE
)
4789 fieldpos
= int_byte_position (local
->field
);
4793 /* Output any buffered-up bit-fields preceding this element. */
4794 if (local
->byte_buffer_in_use
)
4796 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4797 local
->total_bytes
++;
4798 local
->byte_buffer_in_use
= false;
4801 /* Advance to offset of this element.
4802 Note no alignment needed in an array, since that is guaranteed
4803 if each element has the proper size. */
4804 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4805 && fieldpos
!= local
->total_bytes
)
4807 gcc_assert (fieldpos
>= local
->total_bytes
);
4808 assemble_zeros (fieldpos
- local
->total_bytes
);
4809 local
->total_bytes
= fieldpos
;
4812 /* Find the alignment of this element. */
4813 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
4815 /* Determine size this element should occupy. */
4820 /* If this is an array with an unspecified upper bound,
4821 the initializer determines the size. */
4822 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4823 but we cannot do this until the deprecated support for
4824 initializing zero-length array members is removed. */
4825 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
4826 && TYPE_DOMAIN (TREE_TYPE (local
->field
))
4827 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
))))
4829 fieldsize
= array_size_for_constructor (local
->val
);
4830 /* Given a non-empty initialization, this field had
4832 gcc_assert (!fieldsize
|| !DECL_CHAIN (local
->field
));
4835 fieldsize
= tree_low_cst (DECL_SIZE_UNIT (local
->field
), 1);
4838 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
4840 /* Output the element's initial value. */
4841 if (local
->val
== NULL_TREE
)
4842 assemble_zeros (fieldsize
);
4844 output_constant (local
->val
, fieldsize
, align2
);
4846 /* Count its size. */
4847 local
->total_bytes
+= fieldsize
;
4850 /* Helper for output_constructor. From the current LOCAL and OUTER states,
4851 output an element that is a true bitfield or part of an outer one. */
4854 output_constructor_bitfield (oc_local_state
*local
, oc_outer_state
*outer
)
4856 /* Bit size of this element. */
4857 HOST_WIDE_INT ebitsize
4859 ? tree_low_cst (DECL_SIZE (local
->field
), 1)
4860 : tree_low_cst (TYPE_SIZE (TREE_TYPE (local
->type
)), 1));
4862 /* Relative index of this element if this is an array component. */
4863 HOST_WIDE_INT relative_index
4866 ? (tree_low_cst (local
->index
, 0)
4867 - tree_low_cst (local
->min_index
, 0))
4868 : local
->last_relative_index
+ 1)
4871 /* Bit position of this element from the start of the containing
4873 HOST_WIDE_INT constructor_relative_ebitpos
4875 ? int_bit_position (local
->field
)
4876 : ebitsize
* relative_index
);
4878 /* Bit position of this element from the start of a possibly ongoing
4879 outer byte buffer. */
4880 HOST_WIDE_INT byte_relative_ebitpos
4881 = ((outer
? outer
->bit_offset
: 0) + constructor_relative_ebitpos
);
4883 /* From the start of a possibly ongoing outer byte buffer, offsets to
4884 the first bit of this element and to the first bit past the end of
4886 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
4887 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
4889 local
->last_relative_index
= relative_index
;
4891 if (local
->val
== NULL_TREE
)
4892 local
->val
= integer_zero_node
;
4894 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
4895 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
4896 local
->val
= TREE_OPERAND (local
->val
, 0);
4898 if (TREE_CODE (local
->val
) != INTEGER_CST
4899 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
4901 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
4905 /* If this field does not start in this (or, next) byte,
4907 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4909 /* Output remnant of any bit field in previous bytes. */
4910 if (local
->byte_buffer_in_use
)
4912 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4913 local
->total_bytes
++;
4914 local
->byte_buffer_in_use
= false;
4917 /* If still not at proper byte, advance to there. */
4918 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4920 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
4921 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
4922 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
4926 /* Set up the buffer if necessary. */
4927 if (!local
->byte_buffer_in_use
)
4931 local
->byte_buffer_in_use
= true;
4934 /* If this is nested constructor, recurse passing the bit offset and the
4935 pending data, then retrieve the new pending data afterwards. */
4936 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
4938 oc_outer_state output_state
;
4940 output_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
4941 output_state
.byte
= local
->byte
;
4943 += output_constructor (local
->val
, 0, 0, &output_state
);
4944 local
->byte
= output_state
.byte
;
4948 /* Otherwise, we must split the element into pieces that fall within
4949 separate bytes, and combine each byte with previous or following
4951 while (next_offset
< end_offset
)
4955 HOST_WIDE_INT value
;
4956 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
4957 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
4959 /* Advance from byte to byte
4960 within this element when necessary. */
4961 while (next_byte
!= local
->total_bytes
)
4963 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4964 local
->total_bytes
++;
4968 /* Number of bits we can process at once
4969 (all part of the same byte). */
4970 this_time
= MIN (end_offset
- next_offset
,
4971 BITS_PER_UNIT
- next_bit
);
4972 if (BYTES_BIG_ENDIAN
)
4974 /* On big-endian machine, take the most significant bits
4975 first (of the bits that are significant)
4976 and put them into bytes from the most significant end. */
4977 shift
= end_offset
- next_offset
- this_time
;
4979 /* Don't try to take a bunch of bits that cross
4980 the word boundary in the INTEGER_CST. We can
4981 only select bits from the LOW or HIGH part
4983 if (shift
< HOST_BITS_PER_WIDE_INT
4984 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4986 this_time
= shift
+ this_time
- HOST_BITS_PER_WIDE_INT
;
4987 shift
= HOST_BITS_PER_WIDE_INT
;
4990 /* Now get the bits from the appropriate constant word. */
4991 if (shift
< HOST_BITS_PER_WIDE_INT
)
4992 value
= TREE_INT_CST_LOW (local
->val
);
4995 gcc_assert (shift
< HOST_BITS_PER_DOUBLE_INT
);
4996 value
= TREE_INT_CST_HIGH (local
->val
);
4997 shift
-= HOST_BITS_PER_WIDE_INT
;
5000 /* Get the result. This works only when:
5001 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5002 local
->byte
|= (((value
>> shift
)
5003 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5004 << (BITS_PER_UNIT
- this_time
- next_bit
));
5008 /* On little-endian machines,
5009 take first the least significant bits of the value
5010 and pack them starting at the least significant
5011 bits of the bytes. */
5012 shift
= next_offset
- byte_relative_ebitpos
;
5014 /* Don't try to take a bunch of bits that cross
5015 the word boundary in the INTEGER_CST. We can
5016 only select bits from the LOW or HIGH part
5018 if (shift
< HOST_BITS_PER_WIDE_INT
5019 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
5020 this_time
= (HOST_BITS_PER_WIDE_INT
- shift
);
5022 /* Now get the bits from the appropriate constant word. */
5023 if (shift
< HOST_BITS_PER_WIDE_INT
)
5024 value
= TREE_INT_CST_LOW (local
->val
);
5027 gcc_assert (shift
< HOST_BITS_PER_DOUBLE_INT
);
5028 value
= TREE_INT_CST_HIGH (local
->val
);
5029 shift
-= HOST_BITS_PER_WIDE_INT
;
5032 /* Get the result. This works only when:
5033 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5034 local
->byte
|= (((value
>> shift
)
5035 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5039 next_offset
+= this_time
;
5040 local
->byte_buffer_in_use
= true;
5044 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5045 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5046 caller output state of relevance in recursive invocations. */
5048 static unsigned HOST_WIDE_INT
5049 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
5050 unsigned int align
, oc_outer_state
* outer
)
5052 unsigned HOST_WIDE_INT cnt
;
5053 constructor_elt
*ce
;
5055 oc_local_state local
;
5057 /* Setup our local state to communicate with helpers. */
5060 local
.align
= align
;
5062 local
.total_bytes
= 0;
5063 local
.byte_buffer_in_use
= outer
!= NULL
;
5064 local
.byte
= outer
? outer
->byte
: 0;
5066 local
.type
= TREE_TYPE (exp
);
5068 local
.last_relative_index
= -1;
5070 local
.min_index
= NULL_TREE
;
5071 if (TREE_CODE (local
.type
) == ARRAY_TYPE
5072 && TYPE_DOMAIN (local
.type
) != NULL_TREE
)
5073 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5075 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5077 /* As CE goes through the elements of the constant, FIELD goes through the
5078 structure fields if the constant is a structure. If the constant is a
5079 union, we override this by getting the field from the TREE_LIST element.
5080 But the constant could also be an array. Then FIELD is zero.
5082 There is always a maximum of one element in the chain LINK for unions
5083 (even if the initializer in a source program incorrectly contains
5086 local
.field
= NULL_TREE
;
5087 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5088 local
.field
= TYPE_FIELDS (local
.type
);
5091 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5092 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5094 local
.val
= ce
->value
;
5095 local
.index
= NULL_TREE
;
5097 /* The element in a union constructor specifies the proper field
5099 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5100 local
.field
= ce
->index
;
5102 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5103 local
.index
= ce
->index
;
5105 if (local
.field
&& flag_verbose_asm
)
5106 fprintf (asm_out_file
, "%s %s:\n",
5108 DECL_NAME (local
.field
)
5109 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5112 /* Eliminate the marker that makes a cast not be an lvalue. */
5113 if (local
.val
!= NULL_TREE
)
5114 STRIP_NOPS (local
.val
);
5116 /* Output the current element, using the appropriate helper ... */
5118 /* For an array slice not part of an outer bitfield. */
5120 && local
.index
!= NULL_TREE
5121 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5122 output_constructor_array_range (&local
);
5124 /* For a field that is neither a true bitfield nor part of an outer one,
5125 known to be at least byte aligned and multiple-of-bytes long. */
5127 && (local
.field
== NULL_TREE
5128 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5129 output_constructor_regular_field (&local
);
5131 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5132 supported for scalar fields, so we may need to convert first. */
5135 if (TREE_CODE (local
.val
) == REAL_CST
)
5137 = fold_unary (VIEW_CONVERT_EXPR
,
5138 build_nonstandard_integer_type
5139 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5141 output_constructor_bitfield (&local
, outer
);
5145 /* If we are not at toplevel, save the pending data for our caller.
5146 Otherwise output the pending data and padding zeros as needed. */
5148 outer
->byte
= local
.byte
;
5151 if (local
.byte_buffer_in_use
)
5153 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5154 local
.total_bytes
++;
5157 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5159 assemble_zeros (local
.size
- local
.total_bytes
);
5160 local
.total_bytes
= local
.size
;
5164 return local
.total_bytes
;
5167 /* Mark DECL as weak. */
5170 mark_weak (tree decl
)
5172 DECL_WEAK (decl
) = 1;
5174 if (DECL_RTL_SET_P (decl
)
5175 && MEM_P (DECL_RTL (decl
))
5176 && XEXP (DECL_RTL (decl
), 0)
5177 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5178 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5181 /* Merge weak status between NEWDECL and OLDDECL. */
5184 merge_weak (tree newdecl
, tree olddecl
)
5186 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5188 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5191 /* We put the NEWDECL on the weak_decls list at some point
5192 and OLDDECL as well. Keep just OLDDECL on the list. */
5193 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5194 if (TREE_VALUE (*pwd
) == newdecl
)
5196 *pwd
= TREE_CHAIN (*pwd
);
5203 if (DECL_WEAK (newdecl
))
5207 /* NEWDECL is weak, but OLDDECL is not. */
5209 /* If we already output the OLDDECL, we're in trouble; we can't
5210 go back and make it weak. This should never happen in
5211 unit-at-a-time compilation. */
5212 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5214 /* If we've already generated rtl referencing OLDDECL, we may
5215 have done so in a way that will not function properly with
5216 a weak symbol. Again in unit-at-a-time this should be
5218 gcc_assert (!TREE_USED (olddecl
)
5219 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5221 if (TARGET_SUPPORTS_WEAK
)
5223 /* We put the NEWDECL on the weak_decls list at some point.
5224 Replace it with the OLDDECL. */
5225 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5226 if (TREE_VALUE (wd
) == newdecl
)
5228 TREE_VALUE (wd
) = olddecl
;
5231 /* We may not find the entry on the list. If NEWDECL is a
5232 weak alias, then we will have already called
5233 globalize_decl to remove the entry; in that case, we do
5234 not need to do anything. */
5237 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5238 mark_weak (olddecl
);
5241 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5242 weak. Just update NEWDECL to indicate that it's weak too. */
5243 mark_weak (newdecl
);
5246 /* Declare DECL to be a weak symbol. */
5249 declare_weak (tree decl
)
5251 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5252 if (! TREE_PUBLIC (decl
))
5253 error ("weak declaration of %q+D must be public", decl
);
5254 else if (!TARGET_SUPPORTS_WEAK
)
5255 warning (0, "weak declaration of %q+D not supported", decl
);
5258 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5259 DECL_ATTRIBUTES (decl
)
5260 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5264 weak_finish_1 (tree decl
)
5266 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5267 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5270 if (! TREE_USED (decl
))
5273 #ifdef ASM_WEAKEN_DECL
5274 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5276 #ifdef ASM_WEAKEN_LABEL
5277 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5279 #ifdef ASM_OUTPUT_WEAK_ALIAS
5281 static bool warn_once
= 0;
5284 warning (0, "only weak aliases are supported in this configuration");
5294 /* Fiven an assembly name, find the decl it is associated with. */
5296 find_decl (tree target
)
5298 symtab_node node
= symtab_node_for_asm (target
);
5300 return node
->symbol
.decl
;
5304 /* This TREE_LIST contains weakref targets. */
5306 static GTY(()) tree weakref_targets
;
5308 /* Emit any pending weak declarations. */
5315 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5317 tree alias_decl
= TREE_PURPOSE (t
);
5318 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5320 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5321 /* Remove alias_decl from the weak list, but leave entries for
5322 the target alone. */
5324 #ifndef ASM_OUTPUT_WEAKREF
5325 else if (! TREE_SYMBOL_REFERENCED (target
))
5327 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5328 defined, otherwise we and weak_finish_1 would use
5329 different macros. */
5330 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5331 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5333 tree decl
= find_decl (target
);
5337 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5338 TREE_CODE (alias_decl
), target
,
5339 TREE_TYPE (alias_decl
));
5341 DECL_EXTERNAL (decl
) = 1;
5342 TREE_PUBLIC (decl
) = 1;
5343 DECL_ARTIFICIAL (decl
) = 1;
5344 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5345 TREE_USED (decl
) = 1;
5348 weak_finish_1 (decl
);
5357 /* Remove the alias and the target from the pending weak list
5358 so that we do not emit any .weak directives for the former,
5359 nor multiple .weak directives for the latter. */
5360 for (p
= &weak_decls
; (t2
= *p
) ; )
5362 if (TREE_VALUE (t2
) == alias_decl
5363 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5364 *p
= TREE_CHAIN (t2
);
5366 p
= &TREE_CHAIN (t2
);
5369 /* Remove other weakrefs to the same target, to speed things up. */
5370 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5372 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5373 *p
= TREE_CHAIN (t2
);
5375 p
= &TREE_CHAIN (t2
);
5380 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5382 tree decl
= TREE_VALUE (t
);
5384 weak_finish_1 (decl
);
5388 /* Emit the assembly bits to indicate that DECL is globally visible. */
5391 globalize_decl (tree decl
)
5394 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5395 if (DECL_WEAK (decl
))
5397 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5400 #ifdef ASM_WEAKEN_DECL
5401 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5403 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5406 /* Remove this function from the pending weak list so that
5407 we do not emit multiple .weak directives for it. */
5408 for (p
= &weak_decls
; (t
= *p
) ; )
5410 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5411 *p
= TREE_CHAIN (t
);
5413 p
= &TREE_CHAIN (t
);
5416 /* Remove weakrefs to the same target from the pending weakref
5417 list, for the same reason. */
5418 for (p
= &weakref_targets
; (t
= *p
) ; )
5420 if (DECL_ASSEMBLER_NAME (decl
)
5421 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5422 *p
= TREE_CHAIN (t
);
5424 p
= &TREE_CHAIN (t
);
5431 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5434 vec
<alias_pair
, va_gc
> *alias_pairs
;
5436 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5437 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5438 tree node is DECL to have the value of the tree node TARGET. */
5441 do_assemble_alias (tree decl
, tree target
)
5443 /* Emulated TLS had better not get this var. */
5444 gcc_assert(!(!targetm
.have_tls
5445 && TREE_CODE (decl
) == VAR_DECL
5446 && DECL_THREAD_LOCAL_P (decl
)));
5448 if (TREE_ASM_WRITTEN (decl
))
5451 /* We must force creation of DECL_RTL for debug info generation, even though
5452 we don't use it here. */
5453 make_decl_rtl (decl
);
5455 TREE_ASM_WRITTEN (decl
) = 1;
5456 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5458 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5460 ultimate_transparent_alias_target (&target
);
5462 if (!TREE_SYMBOL_REFERENCED (target
))
5463 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5465 #ifdef ASM_OUTPUT_WEAKREF
5466 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5467 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5468 IDENTIFIER_POINTER (target
));
5470 if (!TARGET_SUPPORTS_WEAK
)
5472 error_at (DECL_SOURCE_LOCATION (decl
),
5473 "weakref is not supported in this configuration");
5480 #ifdef ASM_OUTPUT_DEF
5481 /* Make name accessible from other files, if appropriate. */
5483 if (TREE_PUBLIC (decl
))
5485 globalize_decl (decl
);
5486 maybe_assemble_visibility (decl
);
5488 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5490 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5491 if (targetm
.has_ifunc_p ())
5492 ASM_OUTPUT_TYPE_DIRECTIVE
5493 (asm_out_file
, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5497 error_at (DECL_SOURCE_LOCATION (decl
),
5498 "ifunc is not supported on this target");
5501 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5502 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5504 ASM_OUTPUT_DEF (asm_out_file
,
5505 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5506 IDENTIFIER_POINTER (target
));
5508 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5513 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5514 # ifdef ASM_WEAKEN_DECL
5515 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5517 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5519 /* Remove this function from the pending weak list so that
5520 we do not emit multiple .weak directives for it. */
5521 for (p
= &weak_decls
; (t
= *p
) ; )
5522 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5523 *p
= TREE_CHAIN (t
);
5525 p
= &TREE_CHAIN (t
);
5527 /* Remove weakrefs to the same target from the pending weakref
5528 list, for the same reason. */
5529 for (p
= &weakref_targets
; (t
= *p
) ; )
5531 if (DECL_ASSEMBLER_NAME (decl
)
5532 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5533 *p
= TREE_CHAIN (t
);
5535 p
= &TREE_CHAIN (t
);
5541 /* Emit an assembler directive to make the symbol for DECL an alias to
5542 the symbol for TARGET. */
5545 assemble_alias (tree decl
, tree target
)
5549 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5551 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5553 ultimate_transparent_alias_target (&target
);
5555 if (alias
== target
)
5556 error ("weakref %q+D ultimately targets itself", decl
);
5557 if (TREE_PUBLIC (decl
))
5558 error ("weakref %q+D must have static linkage", decl
);
5562 #if !defined (ASM_OUTPUT_DEF)
5563 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5564 error_at (DECL_SOURCE_LOCATION (decl
),
5565 "alias definitions not supported in this configuration");
5568 if (!DECL_WEAK (decl
))
5570 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5571 error_at (DECL_SOURCE_LOCATION (decl
),
5572 "ifunc is not supported in this configuration");
5574 error_at (DECL_SOURCE_LOCATION (decl
),
5575 "only weak aliases are supported in this configuration");
5581 TREE_USED (decl
) = 1;
5583 /* Allow aliases to aliases. */
5584 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5585 cgraph_get_create_node (decl
)->symbol
.alias
= true;
5587 varpool_node_for_decl (decl
)->symbol
.alias
= true;
5589 /* If the target has already been emitted, we don't have to queue the
5590 alias. This saves a tad of memory. */
5591 if (cgraph_global_info_ready
)
5592 target_decl
= find_decl (target
);
5595 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5596 || cgraph_state
>= CGRAPH_STATE_EXPANSION
)
5597 do_assemble_alias (decl
, target
);
5600 alias_pair p
= {decl
, target
};
5601 vec_safe_push (alias_pairs
, p
);
5605 /* Record and output a table of translations from original function
5606 to its transaction aware clone. Note that tm_pure functions are
5607 considered to be their own clone. */
5609 static GTY((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
5610 htab_t tm_clone_hash
;
5613 record_tm_clone_pair (tree o
, tree n
)
5615 struct tree_map
**slot
, *h
;
5617 if (tm_clone_hash
== NULL
)
5618 tm_clone_hash
= htab_create_ggc (32, tree_map_hash
, tree_map_eq
, 0);
5620 h
= ggc_alloc_tree_map ();
5621 h
->hash
= htab_hash_pointer (o
);
5625 slot
= (struct tree_map
**)
5626 htab_find_slot_with_hash (tm_clone_hash
, h
, h
->hash
, INSERT
);
5631 get_tm_clone_pair (tree o
)
5635 struct tree_map
*h
, in
;
5638 in
.hash
= htab_hash_pointer (o
);
5639 h
= (struct tree_map
*) htab_find_with_hash (tm_clone_hash
,
5647 typedef struct tm_alias_pair
5655 /* Helper function for finish_tm_clone_pairs. Dump a hash table entry
5656 into a VEC in INFO. */
5659 dump_tm_clone_to_vec (void **slot
, void *info
)
5661 struct tree_map
*map
= (struct tree_map
*) *slot
;
5662 vec
<tm_alias_pair
> *tm_alias_pairs
= (vec
<tm_alias_pair
> *) info
;
5663 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5664 tm_alias_pairs
->safe_push (p
);
5668 /* Dump the actual pairs to the .tm_clone_table section. */
5671 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5675 bool switched
= false;
5677 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5681 struct cgraph_node
*src_n
= cgraph_get_node (src
);
5682 struct cgraph_node
*dst_n
= cgraph_get_node (dst
);
5684 /* The function ipa_tm_create_version() marks the clone as needed if
5685 the original function was needed. But we also mark the clone as
5686 needed if we ever called the clone indirectly through
5687 TM_GETTMCLONE. If neither of these are true, we didn't generate
5688 a clone, and we didn't call it indirectly... no sense keeping it
5689 in the clone table. */
5690 if (!dst_n
|| !dst_n
->symbol
.definition
)
5693 /* This covers the case where we have optimized the original
5694 function away, and only access the transactional clone. */
5695 if (!src_n
|| !src_n
->symbol
.definition
)
5700 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5701 assemble_align (POINTER_SIZE
);
5705 assemble_integer (XEXP (DECL_RTL (src
), 0),
5706 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5707 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5708 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5712 /* Provide a default for the tm_clone_table section. */
5715 default_clone_table_section (void)
5717 return get_named_section (NULL
, ".tm_clone_table", 3);
5720 /* Helper comparison function for qsorting by the DECL_UID stored in
5721 alias_pair->emitted_diags. */
5724 tm_alias_pair_cmp (const void *x
, const void *y
)
5726 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5727 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5728 if (p1
->uid
< p2
->uid
)
5730 if (p1
->uid
> p2
->uid
)
5736 finish_tm_clone_pairs (void)
5738 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5740 if (tm_clone_hash
== NULL
)
5743 /* We need a determenistic order for the .tm_clone_table, otherwise
5744 we will get bootstrap comparison failures, so dump the hash table
5745 to a vector, sort it, and dump the vector. */
5747 /* Dump the hashtable to a vector. */
5748 htab_traverse_noresize (tm_clone_hash
, dump_tm_clone_to_vec
,
5749 (void *) &tm_alias_pairs
);
5751 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5754 dump_tm_clone_pairs (tm_alias_pairs
);
5756 htab_delete (tm_clone_hash
);
5757 tm_clone_hash
= NULL
;
5758 tm_alias_pairs
.release ();
5762 /* Emit an assembler directive to set symbol for DECL visibility to
5763 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5766 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5767 int vis ATTRIBUTE_UNUSED
)
5769 #ifdef HAVE_GAS_HIDDEN
5770 static const char * const visibility_types
[] = {
5771 NULL
, "protected", "hidden", "internal"
5774 const char *name
, *type
;
5776 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5777 type
= visibility_types
[vis
];
5779 fprintf (asm_out_file
, "\t.%s\t", type
);
5780 assemble_name (asm_out_file
, name
);
5781 fprintf (asm_out_file
, "\n");
5783 if (!DECL_ARTIFICIAL (decl
))
5784 warning (OPT_Wattributes
, "visibility attribute not supported "
5785 "in this configuration; ignored");
5789 /* A helper function to call assemble_visibility when needed for a decl. */
5792 maybe_assemble_visibility (tree decl
)
5794 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5796 if (vis
!= VISIBILITY_DEFAULT
)
5798 targetm
.asm_out
.assemble_visibility (decl
, vis
);
5805 /* Returns 1 if the target configuration supports defining public symbols
5806 so that one of them will be chosen at link time instead of generating a
5807 multiply-defined symbol error, whether through the use of weak symbols or
5808 a target-specific mechanism for having duplicates discarded. */
5811 supports_one_only (void)
5813 if (SUPPORTS_ONE_ONLY
)
5815 return TARGET_SUPPORTS_WEAK
;
5818 /* Set up DECL as a public symbol that can be defined in multiple
5819 translation units without generating a linker error. */
5822 make_decl_one_only (tree decl
, tree comdat_group
)
5824 gcc_assert (TREE_CODE (decl
) == VAR_DECL
5825 || TREE_CODE (decl
) == FUNCTION_DECL
);
5827 TREE_PUBLIC (decl
) = 1;
5829 if (SUPPORTS_ONE_ONLY
)
5831 #ifdef MAKE_DECL_ONE_ONLY
5832 MAKE_DECL_ONE_ONLY (decl
);
5834 DECL_COMDAT_GROUP (decl
) = comdat_group
;
5836 else if (TREE_CODE (decl
) == VAR_DECL
5837 && (DECL_INITIAL (decl
) == 0 || DECL_INITIAL (decl
) == error_mark_node
))
5838 DECL_COMMON (decl
) = 1;
5841 gcc_assert (TARGET_SUPPORTS_WEAK
);
5842 DECL_WEAK (decl
) = 1;
5847 init_varasm_once (void)
5849 section_htab
= htab_create_ggc (31, section_entry_hash
,
5850 section_entry_eq
, NULL
);
5851 object_block_htab
= htab_create_ggc (31, object_block_entry_hash
,
5852 object_block_entry_eq
, NULL
);
5853 const_desc_htab
= htab_create_ggc (1009, const_desc_hash
,
5854 const_desc_eq
, NULL
);
5856 const_alias_set
= new_alias_set ();
5857 shared_constant_pool
= create_constant_pool ();
5859 #ifdef TEXT_SECTION_ASM_OP
5860 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
5861 TEXT_SECTION_ASM_OP
);
5864 #ifdef DATA_SECTION_ASM_OP
5865 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5866 DATA_SECTION_ASM_OP
);
5869 #ifdef SDATA_SECTION_ASM_OP
5870 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5871 SDATA_SECTION_ASM_OP
);
5874 #ifdef READONLY_DATA_SECTION_ASM_OP
5875 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
5876 READONLY_DATA_SECTION_ASM_OP
);
5879 #ifdef CTORS_SECTION_ASM_OP
5880 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
5881 CTORS_SECTION_ASM_OP
);
5884 #ifdef DTORS_SECTION_ASM_OP
5885 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
5886 DTORS_SECTION_ASM_OP
);
5889 #ifdef BSS_SECTION_ASM_OP
5890 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5891 output_section_asm_op
,
5892 BSS_SECTION_ASM_OP
);
5895 #ifdef SBSS_SECTION_ASM_OP
5896 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5897 output_section_asm_op
,
5898 SBSS_SECTION_ASM_OP
);
5901 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5902 | SECTION_COMMON
, emit_tls_common
);
5903 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5904 | SECTION_COMMON
, emit_local
);
5905 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5906 | SECTION_COMMON
, emit_common
);
5908 #if defined ASM_OUTPUT_ALIGNED_BSS
5909 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
5913 targetm
.asm_out
.init_sections ();
5915 if (readonly_data_section
== NULL
)
5916 readonly_data_section
= text_section
;
5918 #ifdef ASM_OUTPUT_EXTERNAL
5919 pending_assemble_externals_set
= pointer_set_create ();
5924 decl_default_tls_model (const_tree decl
)
5926 enum tls_model kind
;
5929 is_local
= targetm
.binds_local_p (decl
);
5933 kind
= TLS_MODEL_LOCAL_EXEC
;
5935 kind
= TLS_MODEL_INITIAL_EXEC
;
5938 /* Local dynamic is inefficient when we're not combining the
5939 parts of the address. */
5940 else if (optimize
&& is_local
)
5941 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
5943 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
5944 if (kind
< flag_tls_default
)
5945 kind
= flag_tls_default
;
5950 /* Select a set of attributes for section NAME based on the properties
5951 of DECL and whether or not RELOC indicates that DECL's initializer
5952 might contain runtime relocations.
5954 We make the section read-only and executable for a function decl,
5955 read-only for a const data decl, and writable for a non-const data decl. */
5958 default_section_type_flags (tree decl
, const char *name
, int reloc
)
5962 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
5963 flags
= SECTION_CODE
;
5966 enum section_category category
5967 = categorize_decl_for_section (decl
, reloc
);
5968 if (decl_readonly_section_1 (category
))
5970 else if (category
== SECCAT_DATA_REL_RO
5971 || category
== SECCAT_DATA_REL_RO_LOCAL
)
5972 flags
= SECTION_WRITE
| SECTION_RELRO
;
5974 flags
= SECTION_WRITE
;
5978 flags
= SECTION_WRITE
;
5979 if (strcmp (name
, ".data.rel.ro") == 0
5980 || strcmp (name
, ".data.rel.ro.local") == 0)
5981 flags
|= SECTION_RELRO
;
5984 if (decl
&& DECL_P (decl
) && DECL_ONE_ONLY (decl
))
5985 flags
|= SECTION_LINKONCE
;
5987 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
5988 flags
|= SECTION_TLS
| SECTION_WRITE
;
5990 if (strcmp (name
, ".bss") == 0
5991 || strncmp (name
, ".bss.", 5) == 0
5992 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
5993 || strcmp (name
, ".sbss") == 0
5994 || strncmp (name
, ".sbss.", 6) == 0
5995 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
5996 flags
|= SECTION_BSS
;
5998 if (strcmp (name
, ".tdata") == 0
5999 || strncmp (name
, ".tdata.", 7) == 0
6000 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6001 flags
|= SECTION_TLS
;
6003 if (strcmp (name
, ".tbss") == 0
6004 || strncmp (name
, ".tbss.", 6) == 0
6005 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6006 flags
|= SECTION_TLS
| SECTION_BSS
;
6008 /* These three sections have special ELF types. They are neither
6009 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6010 want to print a section type (@progbits or @nobits). If someone
6011 is silly enough to emit code or TLS variables to one of these
6012 sections, then don't handle them specially. */
6013 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6014 && (strcmp (name
, ".init_array") == 0
6015 || strcmp (name
, ".fini_array") == 0
6016 || strcmp (name
, ".preinit_array") == 0))
6017 flags
|= SECTION_NOTYPE
;
6022 /* Return true if the target supports some form of global BSS,
6023 either through bss_noswitch_section, or by selecting a BSS
6024 section in TARGET_ASM_SELECT_SECTION. */
6027 have_global_bss_p (void)
6029 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6032 /* Output assembly to switch to section NAME with attribute FLAGS.
6033 Four variants for common object file formats. */
6036 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6037 unsigned int flags ATTRIBUTE_UNUSED
,
6038 tree decl ATTRIBUTE_UNUSED
)
6040 /* Some object formats don't support named sections at all. The
6041 front-end should already have flagged this as an error. */
6045 #ifndef TLS_SECTION_ASM_FLAG
6046 #define TLS_SECTION_ASM_FLAG 'T'
6050 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6051 tree decl ATTRIBUTE_UNUSED
)
6053 char flagchars
[10], *f
= flagchars
;
6055 /* If we have already declared this section, we can use an
6056 abbreviated form to switch back to it -- unless this section is
6057 part of a COMDAT groups, in which case GAS requires the full
6058 declaration every time. */
6059 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6060 && (flags
& SECTION_DECLARED
))
6062 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6066 if (!(flags
& SECTION_DEBUG
))
6068 if (flags
& SECTION_EXCLUDE
)
6070 if (flags
& SECTION_WRITE
)
6072 if (flags
& SECTION_CODE
)
6074 if (flags
& SECTION_SMALL
)
6076 if (flags
& SECTION_MERGE
)
6078 if (flags
& SECTION_STRINGS
)
6080 if (flags
& SECTION_TLS
)
6081 *f
++ = TLS_SECTION_ASM_FLAG
;
6082 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6086 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6088 if (!(flags
& SECTION_NOTYPE
))
6093 if (flags
& SECTION_BSS
)
6099 /* On platforms that use "@" as the assembly comment character,
6101 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6103 fprintf (asm_out_file
, format
, type
);
6105 if (flags
& SECTION_ENTSIZE
)
6106 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6107 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6109 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6110 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6112 fprintf (asm_out_file
, ",%s,comdat",
6113 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6117 putc ('\n', asm_out_file
);
6121 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6122 tree decl ATTRIBUTE_UNUSED
)
6124 char flagchars
[8], *f
= flagchars
;
6126 if (flags
& SECTION_WRITE
)
6128 if (flags
& SECTION_CODE
)
6132 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6136 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6139 default_coff_asm_named_section (name
, flags
, decl
);
6141 if (flags
& SECTION_LINKONCE
)
6143 /* Functions may have been compiled at various levels of
6144 optimization so we can't use `same_size' here.
6145 Instead, have the linker pick one. */
6146 fprintf (asm_out_file
, "\t.linkonce %s\n",
6147 (flags
& SECTION_CODE
? "discard" : "same_size"));
6151 /* The lame default section selector. */
6154 default_select_section (tree decl
, int reloc
,
6155 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6159 if (decl_readonly_section (decl
, reloc
))
6160 return readonly_data_section
;
6162 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6164 if (! ((flag_pic
&& reloc
)
6165 || !TREE_READONLY (decl
)
6166 || TREE_SIDE_EFFECTS (decl
)
6167 || !TREE_CONSTANT (decl
)))
6168 return readonly_data_section
;
6170 else if (TREE_CODE (decl
) == STRING_CST
)
6171 return readonly_data_section
;
6172 else if (! (flag_pic
&& reloc
))
6173 return readonly_data_section
;
6175 return data_section
;
6178 enum section_category
6179 categorize_decl_for_section (const_tree decl
, int reloc
)
6181 enum section_category ret
;
6183 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6185 else if (TREE_CODE (decl
) == STRING_CST
)
6188 || (flag_asan
&& asan_protect_global (CONST_CAST_TREE (decl
))))
6189 /* or !flag_merge_constants */
6190 return SECCAT_RODATA
;
6192 return SECCAT_RODATA_MERGE_STR
;
6194 else if (TREE_CODE (decl
) == VAR_DECL
)
6196 if (bss_initializer_p (decl
))
6198 else if (! TREE_READONLY (decl
)
6199 || TREE_SIDE_EFFECTS (decl
)
6200 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6202 /* Here the reloc_rw_mask is not testing whether the section should
6203 be read-only or not, but whether the dynamic link will have to
6204 do something. If so, we wish to segregate the data in order to
6205 minimize cache misses inside the dynamic linker. */
6206 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6207 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6211 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6212 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6213 else if (reloc
|| flag_merge_constants
< 2 || flag_mudflap
6214 || (flag_asan
&& asan_protect_global (CONST_CAST_TREE (decl
))))
6215 /* C and C++ don't allow different variables to share the same
6216 location. -fmerge-all-constants allows even that (at the
6217 expense of not conforming). */
6218 ret
= SECCAT_RODATA
;
6219 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6220 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6222 ret
= SECCAT_RODATA_MERGE_CONST
;
6224 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6226 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6227 || TREE_SIDE_EFFECTS (decl
)
6228 || ! TREE_CONSTANT (decl
))
6231 ret
= SECCAT_RODATA
;
6234 ret
= SECCAT_RODATA
;
6236 /* There are no read-only thread-local sections. */
6237 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6239 /* Note that this would be *just* SECCAT_BSS, except that there's
6240 no concept of a read-only thread-local-data section. */
6241 if (ret
== SECCAT_BSS
6242 || (flag_zero_initialized_in_bss
6243 && initializer_zerop (DECL_INITIAL (decl
))))
6249 /* If the target uses small data sections, select it. */
6250 else if (targetm
.in_small_data_p (decl
))
6252 if (ret
== SECCAT_BSS
)
6254 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6255 ret
= SECCAT_SRODATA
;
6264 decl_readonly_section_1 (enum section_category category
)
6269 case SECCAT_RODATA_MERGE_STR
:
6270 case SECCAT_RODATA_MERGE_STR_INIT
:
6271 case SECCAT_RODATA_MERGE_CONST
:
6272 case SECCAT_SRODATA
:
6280 decl_readonly_section (const_tree decl
, int reloc
)
6282 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6285 /* Select a section based on the above categorization. */
6288 default_elf_select_section (tree decl
, int reloc
,
6289 unsigned HOST_WIDE_INT align
)
6292 switch (categorize_decl_for_section (decl
, reloc
))
6295 /* We're not supposed to be called on FUNCTION_DECLs. */
6298 return readonly_data_section
;
6299 case SECCAT_RODATA_MERGE_STR
:
6300 return mergeable_string_section (decl
, align
, 0);
6301 case SECCAT_RODATA_MERGE_STR_INIT
:
6302 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6303 case SECCAT_RODATA_MERGE_CONST
:
6304 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6305 case SECCAT_SRODATA
:
6309 return data_section
;
6310 case SECCAT_DATA_REL
:
6311 sname
= ".data.rel";
6313 case SECCAT_DATA_REL_LOCAL
:
6314 sname
= ".data.rel.local";
6316 case SECCAT_DATA_REL_RO
:
6317 sname
= ".data.rel.ro";
6319 case SECCAT_DATA_REL_RO_LOCAL
:
6320 sname
= ".data.rel.ro.local";
6343 return get_named_section (decl
, sname
, reloc
);
6346 /* Construct a unique section name based on the decl name and the
6347 categorization performed above. */
6350 default_unique_section (tree decl
, int reloc
)
6352 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6353 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6354 const char *prefix
, *name
, *linkonce
;
6357 switch (categorize_decl_for_section (decl
, reloc
))
6360 prefix
= one_only
? ".t" : ".text";
6363 case SECCAT_RODATA_MERGE_STR
:
6364 case SECCAT_RODATA_MERGE_STR_INIT
:
6365 case SECCAT_RODATA_MERGE_CONST
:
6366 prefix
= one_only
? ".r" : ".rodata";
6368 case SECCAT_SRODATA
:
6369 prefix
= one_only
? ".s2" : ".sdata2";
6372 prefix
= one_only
? ".d" : ".data";
6374 case SECCAT_DATA_REL
:
6375 prefix
= one_only
? ".d.rel" : ".data.rel";
6377 case SECCAT_DATA_REL_LOCAL
:
6378 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6380 case SECCAT_DATA_REL_RO
:
6381 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6383 case SECCAT_DATA_REL_RO_LOCAL
:
6384 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6387 prefix
= one_only
? ".s" : ".sdata";
6390 prefix
= one_only
? ".b" : ".bss";
6393 prefix
= one_only
? ".sb" : ".sbss";
6396 prefix
= one_only
? ".td" : ".tdata";
6399 prefix
= one_only
? ".tb" : ".tbss";
6405 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
6406 name
= targetm
.strip_name_encoding (name
);
6408 /* If we're using one_only, then there needs to be a .gnu.linkonce
6409 prefix to the section name. */
6410 linkonce
= one_only
? ".gnu.linkonce" : "";
6412 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6414 DECL_SECTION_NAME (decl
) = build_string (strlen (string
), string
);
6417 /* Like compute_reloc_for_constant, except for an RTX. The return value
6418 is a mask for which bit 1 indicates a global relocation, and bit 0
6419 indicates a local relocation. */
6422 compute_reloc_for_rtx_1 (rtx
*xp
, void *data
)
6424 int *preloc
= (int *) data
;
6427 switch (GET_CODE (x
))
6430 *preloc
|= SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6443 compute_reloc_for_rtx (rtx x
)
6447 switch (GET_CODE (x
))
6453 for_each_rtx (&x
, compute_reloc_for_rtx_1
, &reloc
);
6462 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
6464 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6466 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6467 return data_section
;
6469 return readonly_data_section
;
6473 default_elf_select_rtx_section (enum machine_mode mode
, rtx x
,
6474 unsigned HOST_WIDE_INT align
)
6476 int reloc
= compute_reloc_for_rtx (x
);
6478 /* ??? Handle small data here somehow. */
6480 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6483 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6485 return get_named_section (NULL
, ".data.rel.ro", 3);
6488 return mergeable_constant_section (mode
, align
, 0);
6491 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6494 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6499 /* Careful not to prod global register variables. */
6502 symbol
= XEXP (rtl
, 0);
6503 if (GET_CODE (symbol
) != SYMBOL_REF
)
6506 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6507 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6508 flags
|= SYMBOL_FLAG_FUNCTION
;
6509 if (targetm
.binds_local_p (decl
))
6510 flags
|= SYMBOL_FLAG_LOCAL
;
6511 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6512 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6513 else if (targetm
.in_small_data_p (decl
))
6514 flags
|= SYMBOL_FLAG_SMALL
;
6515 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6516 being PUBLIC, the thing *must* be defined in this translation unit.
6517 Prevent this buglet from being propagated into rtl code as well. */
6518 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6519 flags
|= SYMBOL_FLAG_EXTERNAL
;
6521 SYMBOL_REF_FLAGS (symbol
) = flags
;
6524 /* By default, we do nothing for encode_section_info, so we need not
6525 do anything but discard the '*' marker. */
6528 default_strip_name_encoding (const char *str
)
6530 return str
+ (*str
== '*');
6533 #ifdef ASM_OUTPUT_DEF
6534 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6535 anchor relative to ".", the current section position. */
6538 default_asm_output_anchor (rtx symbol
)
6542 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6543 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6544 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6548 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6551 default_use_anchors_for_symbol_p (const_rtx symbol
)
6556 /* Don't use anchors for mergeable sections. The linker might move
6557 the objects around. */
6558 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6559 if (sect
->common
.flags
& SECTION_MERGE
)
6562 /* Don't use anchors for small data sections. The small data register
6563 acts as an anchor for such sections. */
6564 if (sect
->common
.flags
& SECTION_SMALL
)
6567 decl
= SYMBOL_REF_DECL (symbol
);
6568 if (decl
&& DECL_P (decl
))
6570 /* Don't use section anchors for decls that might be defined or
6571 usurped by other modules. */
6572 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
6575 /* Don't use section anchors for decls that will be placed in a
6576 small data section. */
6577 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6578 one above. The problem is that we only use SECTION_SMALL for
6579 sections that should be marked as small in the section directive. */
6580 if (targetm
.in_small_data_p (decl
))
6586 /* Return true when RESOLUTION indicate that symbol will be bound to the
6587 definition provided by current .o file. */
6590 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6592 return (resolution
== LDPR_PREVAILING_DEF
6593 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6594 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6597 /* Return true when RESOLUTION indicate that symbol will be bound locally
6598 within current executable or DSO. */
6601 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6603 return (resolution
== LDPR_PREVAILING_DEF
6604 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6605 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6606 || resolution
== LDPR_PREEMPTED_REG
6607 || resolution
== LDPR_PREEMPTED_IR
6608 || resolution
== LDPR_RESOLVED_IR
6609 || resolution
== LDPR_RESOLVED_EXEC
);
6612 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6613 wrt cross-module name binding. */
6616 default_binds_local_p (const_tree exp
)
6618 return default_binds_local_p_1 (exp
, flag_shlib
);
6622 default_binds_local_p_1 (const_tree exp
, int shlib
)
6625 bool resolved_locally
= false;
6626 bool resolved_to_local_def
= false;
6628 /* With resolution file in hands, take look into resolutions.
6629 We can't just return true for resolved_locally symbols,
6630 because dynamic linking might overwrite symbols
6631 in shared libraries. */
6632 if (TREE_CODE (exp
) == VAR_DECL
&& TREE_PUBLIC (exp
)
6633 && (TREE_STATIC (exp
) || DECL_EXTERNAL (exp
)))
6635 struct varpool_node
*vnode
= varpool_get_node (exp
);
6636 if (vnode
&& resolution_local_p (vnode
->symbol
.resolution
))
6637 resolved_locally
= true;
6639 && resolution_to_local_definition_p (vnode
->symbol
.resolution
))
6640 resolved_to_local_def
= true;
6642 else if (TREE_CODE (exp
) == FUNCTION_DECL
&& TREE_PUBLIC (exp
))
6644 struct cgraph_node
*node
= cgraph_get_node (exp
);
6646 && resolution_local_p (node
->symbol
.resolution
))
6647 resolved_locally
= true;
6649 && resolution_to_local_definition_p (node
->symbol
.resolution
))
6650 resolved_to_local_def
= true;
6653 /* A non-decl is an entry in the constant pool. */
6656 /* Weakrefs may not bind locally, even though the weakref itself is always
6657 static and therefore local. Similarly, the resolver for ifunc functions
6658 might resolve to a non-local function.
6659 FIXME: We can resolve the weakref case more curefuly by looking at the
6661 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6662 || (TREE_CODE (exp
) == FUNCTION_DECL
6663 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6665 /* Static variables are always local. */
6666 else if (! TREE_PUBLIC (exp
))
6668 /* A variable is local if the user has said explicitly that it will
6670 else if ((DECL_VISIBILITY_SPECIFIED (exp
)
6671 || resolved_to_local_def
)
6672 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6674 /* Variables defined outside this object might not be local. */
6675 else if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6677 /* If defined in this object and visibility is not default, must be
6679 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6681 /* Default visibility weak data can be overridden by a strong symbol
6682 in another module and so are not local. */
6683 else if (DECL_WEAK (exp
)
6684 && !resolved_locally
)
6686 /* If PIC, then assume that any global name can be overridden by
6687 symbols resolved from other modules. */
6690 /* Uninitialized COMMON variable may be unified with symbols
6691 resolved from other modules. */
6692 else if (DECL_COMMON (exp
)
6693 && !resolved_locally
6694 && (DECL_INITIAL (exp
) == NULL
6695 || DECL_INITIAL (exp
) == error_mark_node
))
6697 /* Otherwise we're left with initialized (or non-common) global data
6698 which is of necessity defined locally. */
6705 /* Return true when references to DECL must bind to current definition in
6708 The condition is usually equivalent to whether the function binds to the
6709 current module (shared library or executable), that is to binds_local_p.
6710 We use this fact to avoid need for another target hook and implement
6711 the logic using binds_local_p and just special cases where
6712 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6713 the weak definitions (that can be overwritten at linktime by other
6714 definition from different object file) and when resolution info is available
6715 we simply use the knowledge passed to us by linker plugin. */
6717 decl_binds_to_current_def_p (tree decl
)
6719 gcc_assert (DECL_P (decl
));
6720 if (!TREE_PUBLIC (decl
))
6722 if (!targetm
.binds_local_p (decl
))
6724 /* When resolution is available, just use it. */
6725 if (TREE_CODE (decl
) == VAR_DECL
6726 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)))
6728 struct varpool_node
*vnode
= varpool_get_node (decl
);
6730 && vnode
->symbol
.resolution
!= LDPR_UNKNOWN
)
6731 return resolution_to_local_definition_p (vnode
->symbol
.resolution
);
6733 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
6735 struct cgraph_node
*node
= cgraph_get_node (decl
);
6737 && node
->symbol
.resolution
!= LDPR_UNKNOWN
)
6738 return resolution_to_local_definition_p (node
->symbol
.resolution
);
6740 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6741 binds locally but still can be overwritten).
6742 This rely on fact that binds_local_p behave as decl_replaceable_p
6743 for all other declaration types. */
6744 return !DECL_WEAK (decl
);
6747 /* A replaceable function or variable is one which may be replaced
6748 at link-time with an entirely different definition, provided that the
6749 replacement has the same type. For example, functions declared
6750 with __attribute__((weak)) on most systems are replaceable.
6752 COMDAT functions are not replaceable, since all definitions of the
6753 function must be equivalent. It is important that COMDAT functions
6754 not be treated as replaceable so that use of C++ template
6755 instantiations is not penalized. */
6758 decl_replaceable_p (tree decl
)
6760 gcc_assert (DECL_P (decl
));
6761 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
6763 return !decl_binds_to_current_def_p (decl
);
6766 /* Default function to output code that will globalize a label. A
6767 target must define GLOBAL_ASM_OP or provide its own function to
6768 globalize a label. */
6769 #ifdef GLOBAL_ASM_OP
6771 default_globalize_label (FILE * stream
, const char *name
)
6773 fputs (GLOBAL_ASM_OP
, stream
);
6774 assemble_name (stream
, name
);
6775 putc ('\n', stream
);
6777 #endif /* GLOBAL_ASM_OP */
6779 /* Default function to output code that will globalize a declaration. */
6781 default_globalize_decl_name (FILE * stream
, tree decl
)
6783 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6784 targetm
.asm_out
.globalize_label (stream
, name
);
6787 /* Default function to output a label for unwind information. The
6788 default is to do nothing. A target that needs nonlocal labels for
6789 unwind information must provide its own function to do this. */
6791 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6792 tree decl ATTRIBUTE_UNUSED
,
6793 int for_eh ATTRIBUTE_UNUSED
,
6794 int empty ATTRIBUTE_UNUSED
)
6798 /* Default function to output a label to divide up the exception table.
6799 The default is to do nothing. A target that needs/wants to divide
6800 up the table must provide it's own function to do this. */
6802 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
6806 /* This is how to output an internal numbered label where PREFIX is
6807 the class of label and LABELNO is the number within the class. */
6810 default_generate_internal_label (char *buf
, const char *prefix
,
6811 unsigned long labelno
)
6813 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6816 /* This is how to output an internal numbered label where PREFIX is
6817 the class of label and LABELNO is the number within the class. */
6820 default_internal_label (FILE *stream
, const char *prefix
,
6821 unsigned long labelno
)
6823 char *const buf
= (char *) alloca (40 + strlen (prefix
));
6824 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6825 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
6829 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
6832 default_asm_declare_constant_name (FILE *file
, const char *name
,
6833 const_tree exp ATTRIBUTE_UNUSED
,
6834 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
6836 assemble_label (file
, name
);
6839 /* This is the default behavior at the beginning of a file. It's
6840 controlled by two other target-hook toggles. */
6842 default_file_start (void)
6844 if (targetm
.asm_file_start_app_off
6845 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
6846 fputs (ASM_APP_OFF
, asm_out_file
);
6848 if (targetm
.asm_file_start_file_directive
)
6849 output_file_directive (asm_out_file
, main_input_filename
);
6852 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6853 which emits a special section directive used to indicate whether or
6854 not this object file needs an executable stack. This is primarily
6855 a GNU extension to ELF but could be used on other targets. */
6857 int trampolines_created
;
6860 file_end_indicate_exec_stack (void)
6862 unsigned int flags
= SECTION_DEBUG
;
6863 if (trampolines_created
)
6864 flags
|= SECTION_CODE
;
6866 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
6869 /* Emit a special section directive to indicate that this object file
6870 was compiled with -fsplit-stack. This is used to let the linker
6871 detect calls between split-stack code and non-split-stack code, so
6872 that it can modify the split-stack code to allocate a sufficiently
6873 large stack. We emit another special section if there are any
6874 functions in this file which have the no_split_stack attribute, to
6875 prevent the linker from warning about being unable to convert the
6876 functions if they call non-split-stack code. */
6879 file_end_indicate_split_stack (void)
6881 if (flag_split_stack
)
6883 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
6885 if (saw_no_split_stack
)
6886 switch_to_section (get_section (".note.GNU-no-split-stack",
6887 SECTION_DEBUG
, NULL
));
6891 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6892 a get_unnamed_section callback. */
6895 output_section_asm_op (const void *directive
)
6897 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
6900 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6901 the current section is NEW_SECTION. */
6904 switch_to_section (section
*new_section
)
6906 if (in_section
== new_section
)
6909 if (new_section
->common
.flags
& SECTION_FORGET
)
6912 in_section
= new_section
;
6914 switch (SECTION_STYLE (new_section
))
6917 targetm
.asm_out
.named_section (new_section
->named
.name
,
6918 new_section
->named
.common
.flags
,
6919 new_section
->named
.decl
);
6922 case SECTION_UNNAMED
:
6923 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
6926 case SECTION_NOSWITCH
:
6931 new_section
->common
.flags
|= SECTION_DECLARED
;
6934 /* If block symbol SYMBOL has not yet been assigned an offset, place
6935 it at the end of its block. */
6938 place_block_symbol (rtx symbol
)
6940 unsigned HOST_WIDE_INT size
, mask
, offset
;
6941 struct constant_descriptor_rtx
*desc
;
6942 unsigned int alignment
;
6943 struct object_block
*block
;
6946 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
6947 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
6950 /* Work out the symbol's size and alignment. */
6951 if (CONSTANT_POOL_ADDRESS_P (symbol
))
6953 desc
= SYMBOL_REF_CONSTANT (symbol
);
6954 alignment
= desc
->align
;
6955 size
= GET_MODE_SIZE (desc
->mode
);
6957 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
6959 decl
= SYMBOL_REF_DECL (symbol
);
6960 alignment
= DECL_ALIGN (decl
);
6961 size
= get_constant_size (DECL_INITIAL (decl
));
6963 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
6964 && asan_protect_global (DECL_INITIAL (decl
)))
6965 size
+= asan_red_zone_size (size
);
6969 decl
= SYMBOL_REF_DECL (symbol
);
6970 alignment
= DECL_ALIGN (decl
);
6971 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
6972 if (flag_asan
&& asan_protect_global (decl
))
6974 size
+= asan_red_zone_size (size
);
6975 alignment
= MAX (alignment
,
6976 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
6980 /* Calculate the object's offset from the start of the block. */
6981 block
= SYMBOL_REF_BLOCK (symbol
);
6982 mask
= alignment
/ BITS_PER_UNIT
- 1;
6983 offset
= (block
->size
+ mask
) & ~mask
;
6984 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
6986 /* Record the block's new alignment and size. */
6987 block
->alignment
= MAX (block
->alignment
, alignment
);
6988 block
->size
= offset
+ size
;
6990 vec_safe_push (block
->objects
, symbol
);
6993 /* Return the anchor that should be used to address byte offset OFFSET
6994 from the first object in BLOCK. MODEL is the TLS model used
6998 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
6999 enum tls_model model
)
7002 unsigned int begin
, middle
, end
;
7003 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7006 /* Work out the anchor's offset. Use an offset of 0 for the first
7007 anchor so that we don't pessimize the case where we take the address
7008 of a variable at the beginning of the block. This is particularly
7009 useful when a block has only one variable assigned to it.
7011 We try to place anchors RANGE bytes apart, so there can then be
7012 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7013 a ptr_mode offset. With some target settings, the lowest such
7014 anchor might be out of range for the lowest ptr_mode offset;
7015 likewise the highest anchor for the highest offset. Use anchors
7016 at the extreme ends of the ptr_mode range in such cases.
7018 All arithmetic uses unsigned integers in order to avoid
7020 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7021 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7022 range
= max_offset
- min_offset
+ 1;
7027 bias
= 1 << (GET_MODE_BITSIZE (ptr_mode
) - 1);
7030 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7031 delta
-= delta
% range
;
7034 offset
= (HOST_WIDE_INT
) (-delta
);
7038 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7039 delta
-= delta
% range
;
7040 if (delta
> bias
- 1)
7042 offset
= (HOST_WIDE_INT
) delta
;
7046 /* Do a binary search to see if there's already an anchor we can use.
7047 Set BEGIN to the new anchor's index if not. */
7049 end
= vec_safe_length (block
->anchors
);
7050 while (begin
!= end
)
7052 middle
= (end
+ begin
) / 2;
7053 anchor
= (*block
->anchors
)[middle
];
7054 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7056 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7058 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7060 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7066 /* Create a new anchor with a unique label. */
7067 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7068 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7069 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7070 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7072 /* Insert it at index BEGIN. */
7073 vec_safe_insert (block
->anchors
, begin
, anchor
);
7077 /* Output the objects in BLOCK. */
7080 output_object_block (struct object_block
*block
)
7082 struct constant_descriptor_rtx
*desc
;
7084 HOST_WIDE_INT offset
;
7088 if (!block
->objects
)
7091 /* Switch to the section and make sure that the first byte is
7092 suitably aligned. */
7093 switch_to_section (block
->sect
);
7094 assemble_align (block
->alignment
);
7096 /* Define the values of all anchors relative to the current section
7098 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7099 targetm
.asm_out
.output_anchor (symbol
);
7101 /* Output the objects themselves. */
7103 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7105 /* Move to the object's offset, padding with zeros if necessary. */
7106 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7107 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7108 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7110 desc
= SYMBOL_REF_CONSTANT (symbol
);
7111 output_constant_pool_1 (desc
, 1);
7112 offset
+= GET_MODE_SIZE (desc
->mode
);
7114 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7117 decl
= SYMBOL_REF_DECL (symbol
);
7118 assemble_constant_contents (DECL_INITIAL (decl
), XSTR (symbol
, 0),
7120 size
= get_constant_size (DECL_INITIAL (decl
));
7123 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7124 && asan_protect_global (DECL_INITIAL (decl
)))
7126 size
= asan_red_zone_size (size
);
7127 assemble_zeros (size
);
7134 decl
= SYMBOL_REF_DECL (symbol
);
7135 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7136 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
7138 if (flag_asan
&& asan_protect_global (decl
))
7140 size
= asan_red_zone_size (size
);
7141 assemble_zeros (size
);
7148 /* A htab_traverse callback used to call output_object_block for
7149 each member of object_block_htab. */
7152 output_object_block_htab (void **slot
, void *data ATTRIBUTE_UNUSED
)
7154 output_object_block ((struct object_block
*) (*slot
));
7158 /* Output the definitions of all object_blocks. */
7161 output_object_blocks (void)
7163 htab_traverse (object_block_htab
, output_object_block_htab
, NULL
);
7166 /* This function provides a possible implementation of the
7167 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7168 by -frecord-gcc-switches it creates a new mergeable, string section in the
7169 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7170 contains the switches in ASCII format.
7172 FIXME: This code does not correctly handle double quote characters
7173 that appear inside strings, (it strips them rather than preserving them).
7174 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7175 characters - instead it treats them as sub-string separators. Since
7176 we want to emit NUL strings terminators into the object file we have to use
7180 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7184 case SWITCH_TYPE_PASSED
:
7185 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7186 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7189 case SWITCH_TYPE_DESCRIPTIVE
:
7192 /* Distinguish between invocations where name is NULL. */
7193 static bool started
= false;
7199 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7203 | (SECTION_ENTSIZE
& 1),
7205 switch_to_section (sec
);
7214 /* The return value is currently ignored by the caller, but must be 0.
7215 For -fverbose-asm the return value would be the number of characters
7216 emitted into the assembler file. */
7220 /* Emit text to declare externally defined symbols. It is needed to
7221 properly support non-default visibility. */
7223 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7225 const char *name ATTRIBUTE_UNUSED
)
7227 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7228 set in order to avoid putting out names that are never really
7230 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7231 && targetm
.binds_local_p (decl
))
7232 maybe_assemble_visibility (decl
);
7235 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7238 default_asm_output_source_filename (FILE *file
, const char *name
)
7240 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7241 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7243 fprintf (file
, "\t.file\t");
7244 output_quoted_string (file
, name
);
7249 /* Output a file name in the form wanted by System V. */
7252 output_file_directive (FILE *asm_file
, const char *input_name
)
7257 if (input_name
== NULL
)
7258 input_name
= "<stdin>";
7260 input_name
= remap_debug_filename (input_name
);
7262 len
= strlen (input_name
);
7263 na
= input_name
+ len
;
7265 /* NA gets INPUT_NAME sans directory names. */
7266 while (na
> input_name
)
7268 if (IS_DIR_SEPARATOR (na
[-1]))
7273 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7276 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7279 make_debug_expr_from_rtl (const_rtx exp
)
7281 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7282 enum machine_mode mode
= GET_MODE (exp
);
7285 DECL_ARTIFICIAL (ddecl
) = 1;
7286 if (REG_P (exp
) && REG_EXPR (exp
))
7287 type
= TREE_TYPE (REG_EXPR (exp
));
7288 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7289 type
= TREE_TYPE (MEM_EXPR (exp
));
7292 if (type
&& TYPE_MODE (type
) == mode
)
7293 TREE_TYPE (ddecl
) = type
;
7295 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7296 DECL_MODE (ddecl
) = mode
;
7297 dval
= gen_rtx_DEBUG_EXPR (mode
);
7298 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7299 SET_DECL_RTL (ddecl
, dval
);
7303 #ifdef ELF_ASCII_ESCAPES
7304 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7307 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7312 fputs (STRING_ASM_OP
, f
);
7317 escape
= ELF_ASCII_ESCAPES
[c
];
7324 /* TODO: Print in hex with fast function, important for -flto. */
7325 fprintf (f
, "\\%03o", c
);
7338 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7341 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7343 const char *limit
= s
+ len
;
7344 const char *last_null
= NULL
;
7345 unsigned bytes_in_chunk
= 0;
7349 for (; s
< limit
; s
++)
7353 if (bytes_in_chunk
>= 60)
7362 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7369 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7371 if (bytes_in_chunk
> 0)
7378 default_elf_asm_output_limited_string (f
, s
);
7383 if (bytes_in_chunk
== 0)
7384 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7387 escape
= ELF_ASCII_ESCAPES
[c
];
7395 /* TODO: Print in hex with fast function, important for -flto. */
7396 fprintf (f
, "\\%03o", c
);
7397 bytes_in_chunk
+= 4;
7402 bytes_in_chunk
+= 2;
7409 if (bytes_in_chunk
> 0)
7417 static GTY(()) section
*elf_init_array_section
;
7418 static GTY(()) section
*elf_fini_array_section
;
7421 get_elf_initfini_array_priority_section (int priority
,
7425 if (priority
!= DEFAULT_INIT_PRIORITY
)
7428 sprintf (buf
, "%s.%.5u",
7429 constructor_p
? ".init_array" : ".fini_array",
7431 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7437 if (elf_init_array_section
== NULL
)
7438 elf_init_array_section
7439 = get_section (".init_array",
7440 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7441 sec
= elf_init_array_section
;
7445 if (elf_fini_array_section
== NULL
)
7446 elf_fini_array_section
7447 = get_section (".fini_array",
7448 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7449 sec
= elf_fini_array_section
;
7455 /* Use .init_array section for constructors. */
7458 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7460 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7462 assemble_addr_to_section (symbol
, sec
);
7465 /* Use .fini_array section for destructors. */
7468 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7470 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7472 assemble_addr_to_section (symbol
, sec
);
7475 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7477 This is a bit of a cheat. The real default is a no-op, but this
7478 hook is the default for all targets with a .ident directive. */
7481 default_asm_output_ident_directive (const char *ident_str
)
7483 const char *ident_asm_op
= "\t.ident\t";
7485 /* If we are still in the front end, do not write out the string
7486 to asm_out_file. Instead, add a fake top-level asm statement.
7487 This allows the front ends to use this hook without actually
7488 writing to asm_out_file, to handle #ident or Pragma Ident. */
7489 if (cgraph_state
== CGRAPH_STATE_PARSING
)
7491 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7492 add_asm_node (build_string (strlen (buf
), buf
));
7495 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7498 #include "gt-varasm.h"