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
)
405 gcc_assert (!decl
|| DECL_P (decl
));
407 name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
409 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
411 return get_section (name
, flags
, decl
);
414 /* If required, set DECL_SECTION_NAME to a unique name. */
417 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
418 int flag_function_or_data_sections
)
420 if (DECL_SECTION_NAME (decl
) == NULL_TREE
421 && targetm_common
.have_named_sections
422 && (flag_function_or_data_sections
423 || DECL_ONE_ONLY (decl
)))
425 targetm
.asm_out
.unique_section (decl
, reloc
);
426 DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
) = true;
430 #ifdef BSS_SECTION_ASM_OP
432 #ifdef ASM_OUTPUT_ALIGNED_BSS
434 /* Utility function for targets to use in implementing
435 ASM_OUTPUT_ALIGNED_BSS.
436 ??? It is believed that this function will work in most cases so such
437 support is localized here. */
440 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
441 const char *name
, unsigned HOST_WIDE_INT size
,
444 switch_to_section (bss_section
);
445 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
446 #ifdef ASM_DECLARE_OBJECT_NAME
447 last_assemble_variable_decl
= decl
;
448 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
450 /* Standard thing is just output label for the object. */
451 ASM_OUTPUT_LABEL (file
, name
);
452 #endif /* ASM_DECLARE_OBJECT_NAME */
453 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
458 #endif /* BSS_SECTION_ASM_OP */
460 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
461 /* Return the hot section for function DECL. Return text_section for
465 hot_function_section (tree decl
)
467 if (decl
!= NULL_TREE
468 && DECL_SECTION_NAME (decl
) != NULL_TREE
469 && targetm_common
.have_named_sections
)
470 return get_named_section (decl
, NULL
, 0);
476 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
479 When DECL_SECTION_NAME is non-NULL and it is implicit section and
480 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
481 concatenate the name with NAMED_SECTION_SUFFIX.
482 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
485 get_named_text_section (tree decl
,
486 const char *text_section_name
,
487 const char *named_section_suffix
)
489 if (decl
&& DECL_SECTION_NAME (decl
))
491 if (named_section_suffix
)
493 tree dsn
= DECL_SECTION_NAME (decl
);
494 const char *stripped_name
;
497 name
= (char *) alloca (TREE_STRING_LENGTH (dsn
) + 1);
498 memcpy (name
, TREE_STRING_POINTER (dsn
),
499 TREE_STRING_LENGTH (dsn
) + 1);
501 stripped_name
= targetm
.strip_name_encoding (name
);
503 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
504 return get_named_section (decl
, buffer
, 0);
506 else if (DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
))
510 /* Do not try to split gnu_linkonce functions. This gets somewhat
512 if (DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
)
514 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
515 name
= targetm
.strip_name_encoding (name
);
516 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
522 return get_named_section (decl
, text_section_name
, 0);
525 /* Choose named function section based on its frequency. */
528 default_function_section (tree decl
, enum node_frequency freq
,
529 bool startup
, bool exit
)
531 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
532 /* Old GNU linkers have buggy --gc-section support, which sometimes
533 results in .gcc_except_table* sections being garbage collected. */
535 && DECL_SECTION_NAME (decl
)
536 && DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
))
540 if (!flag_reorder_functions
541 || !targetm_common
.have_named_sections
)
543 /* Startup code should go to startup subsection unless it is
544 unlikely executed (this happens especially with function splitting
545 where we can split away unnecessary parts of static constructors. */
546 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
547 return get_named_text_section (decl
, ".text.startup", NULL
);
549 /* Similarly for exit. */
550 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
551 return get_named_text_section (decl
, ".text.exit", NULL
);
553 /* Group cold functions together, similarly for hot code. */
556 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
557 return get_named_text_section (decl
, ".text.unlikely", NULL
);
558 case NODE_FREQUENCY_HOT
:
559 return get_named_text_section (decl
, ".text.hot", NULL
);
565 /* Return the section for function DECL.
567 If DECL is NULL_TREE, return the text section. We can be passed
568 NULL_TREE under some circumstances by dbxout.c at least.
570 If FORCE_COLD is true, return cold function section ignoring
571 the frequency info of cgraph_node. */
574 function_section_1 (tree decl
, bool force_cold
)
576 section
*section
= NULL
;
577 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
578 bool startup
= false, exit
= false;
582 struct cgraph_node
*node
= cgraph_get_node (decl
);
586 freq
= node
->frequency
;
587 startup
= node
->only_called_at_startup
;
588 exit
= node
->only_called_at_exit
;
592 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
594 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
595 if (decl
!= NULL_TREE
596 && DECL_SECTION_NAME (decl
) != NULL_TREE
)
598 if (targetm
.asm_out
.function_section
)
599 section
= targetm
.asm_out
.function_section (decl
, freq
,
603 return get_named_section (decl
, NULL
, 0);
606 return targetm
.asm_out
.select_section
607 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
610 if (targetm
.asm_out
.function_section
)
611 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
614 return hot_function_section (decl
);
618 /* Return the section for function DECL.
620 If DECL is NULL_TREE, return the text section. We can be passed
621 NULL_TREE under some circumstances by dbxout.c at least. */
624 function_section (tree decl
)
626 /* Handle cases where function splitting code decides
627 to put function entry point into unlikely executed section
628 despite the fact that the function itself is not cold
629 (i.e. it is called rarely but contains a hot loop that is
630 better to live in hot subsection for the code locality). */
631 return function_section_1 (decl
,
632 first_function_block_is_cold
);
635 /* Return the section for the current function, take IN_COLD_SECTION_P
639 current_function_section (void)
641 return function_section_1 (current_function_decl
, in_cold_section_p
);
644 /* Tell assembler to switch to unlikely-to-be-executed text section. */
647 unlikely_text_section (void)
649 return function_section_1 (current_function_decl
, true);
652 /* When called within a function context, return true if the function
653 has been assigned a cold text section and if SECT is that section.
654 When called outside a function context, return true if SECT is the
655 default cold section. */
658 unlikely_text_section_p (section
*sect
)
660 return sect
== function_section_1 (current_function_decl
, true);
663 /* Return the read-only data section associated with function DECL. */
666 default_function_rodata_section (tree decl
)
668 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
670 const char *name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
672 if (DECL_ONE_ONLY (decl
) && HAVE_COMDAT_GROUP
)
678 dot
= strchr (name
+ 1, '.');
681 len
= strlen (dot
) + 8;
682 rname
= (char *) alloca (len
);
684 strcpy (rname
, ".rodata");
686 return get_section (rname
, SECTION_LINKONCE
, decl
);
688 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
689 else if (DECL_ONE_ONLY (decl
)
690 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
692 size_t len
= strlen (name
) + 1;
693 char *rname
= (char *) alloca (len
);
695 memcpy (rname
, name
, len
);
697 return get_section (rname
, SECTION_LINKONCE
, decl
);
699 /* For .text.foo we want to use .rodata.foo. */
700 else if (flag_function_sections
&& flag_data_sections
701 && strncmp (name
, ".text.", 6) == 0)
703 size_t len
= strlen (name
) + 1;
704 char *rname
= (char *) alloca (len
+ 2);
706 memcpy (rname
, ".rodata", 7);
707 memcpy (rname
+ 7, name
+ 5, len
- 5);
708 return get_section (rname
, 0, decl
);
712 return readonly_data_section
;
715 /* Return the read-only data section associated with function DECL
716 for targets where that section should be always the single
717 readonly data section. */
720 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
722 return readonly_data_section
;
725 /* Return the section to use for string merging. */
728 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
729 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
730 unsigned int flags ATTRIBUTE_UNUSED
)
734 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
735 && TREE_CODE (decl
) == STRING_CST
736 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
738 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
739 && TREE_STRING_LENGTH (decl
) >= len
)
741 enum machine_mode mode
;
742 unsigned int modesize
;
746 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
747 char *name
= (char *) alloca (strlen (prefix
) + 30);
749 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
750 modesize
= GET_MODE_BITSIZE (mode
);
751 if (modesize
>= 8 && modesize
<= 256
752 && (modesize
& (modesize
- 1)) == 0)
754 if (align
< modesize
)
757 str
= TREE_STRING_POINTER (decl
);
758 unit
= GET_MODE_SIZE (mode
);
760 /* Check for embedded NUL characters. */
761 for (i
= 0; i
< len
; i
+= unit
)
763 for (j
= 0; j
< unit
; j
++)
764 if (str
[i
+ j
] != '\0')
771 sprintf (name
, "%s.str%d.%d", prefix
,
772 modesize
/ 8, (int) (align
/ 8));
773 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
774 return get_section (name
, flags
, NULL
);
779 return readonly_data_section
;
782 /* Return the section to use for constant merging. */
785 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
786 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
787 unsigned int flags ATTRIBUTE_UNUSED
)
789 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
791 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
797 && (align
& (align
- 1)) == 0)
799 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
800 char *name
= (char *) alloca (strlen (prefix
) + 30);
802 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
803 flags
|= (align
/ 8) | SECTION_MERGE
;
804 return get_section (name
, flags
, NULL
);
806 return readonly_data_section
;
809 /* Given NAME, a putative register name, discard any customary prefixes. */
812 strip_reg_name (const char *name
)
814 #ifdef REGISTER_PREFIX
815 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
816 name
+= strlen (REGISTER_PREFIX
);
818 if (name
[0] == '%' || name
[0] == '#')
823 /* The user has asked for a DECL to have a particular name. Set (or
824 change) it in such a way that we don't prefix an underscore to
827 set_user_assembler_name (tree decl
, const char *name
)
829 char *starred
= (char *) alloca (strlen (name
) + 2);
831 strcpy (starred
+ 1, name
);
832 change_decl_assembler_name (decl
, get_identifier (starred
));
833 SET_DECL_RTL (decl
, NULL_RTX
);
836 /* Decode an `asm' spec for a declaration as a register name.
837 Return the register number, or -1 if nothing specified,
838 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
839 or -3 if ASMSPEC is `cc' and is not recognized,
840 or -4 if ASMSPEC is `memory' and is not recognized.
841 Accept an exact spelling or a decimal number.
842 Prefixes such as % are optional. */
845 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
847 /* Presume just one register is clobbered. */
854 /* Get rid of confusing prefixes. */
855 asmspec
= strip_reg_name (asmspec
);
857 /* Allow a decimal number as a "register name". */
858 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
859 if (! ISDIGIT (asmspec
[i
]))
861 if (asmspec
[0] != 0 && i
< 0)
864 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0)
870 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
872 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
875 #ifdef OVERLAPPING_REGISTER_NAMES
879 const char *const name
;
882 } table
[] = OVERLAPPING_REGISTER_NAMES
;
884 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
886 && ! strcmp (asmspec
, table
[i
].name
))
888 *pnregs
= table
[i
].nregs
;
889 return table
[i
].number
;
892 #endif /* OVERLAPPING_REGISTER_NAMES */
894 #ifdef ADDITIONAL_REGISTER_NAMES
896 static const struct { const char *const name
; const int number
; } table
[]
897 = ADDITIONAL_REGISTER_NAMES
;
899 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
901 && ! strcmp (asmspec
, table
[i
].name
))
902 return table
[i
].number
;
904 #endif /* ADDITIONAL_REGISTER_NAMES */
906 if (!strcmp (asmspec
, "memory"))
909 if (!strcmp (asmspec
, "cc"))
919 decode_reg_name (const char *name
)
922 return decode_reg_name_and_count (name
, &count
);
926 /* Return true if DECL's initializer is suitable for a BSS section. */
929 bss_initializer_p (const_tree decl
)
931 return (DECL_INITIAL (decl
) == NULL
932 || DECL_INITIAL (decl
) == error_mark_node
933 || (flag_zero_initialized_in_bss
934 /* Leave constant zeroes in .rodata so they
936 && !TREE_READONLY (decl
)
937 && initializer_zerop (DECL_INITIAL (decl
))));
940 /* Compute the alignment of variable specified by DECL.
941 DONT_OUTPUT_DATA is from assemble_variable. */
944 align_variable (tree decl
, bool dont_output_data
)
946 unsigned int align
= DECL_ALIGN (decl
);
948 /* In the case for initialing an array whose length isn't specified,
949 where we have not yet been able to do the layout,
950 figure out the proper alignment now. */
951 if (dont_output_data
&& DECL_SIZE (decl
) == 0
952 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
953 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
955 /* Some object file formats have a maximum alignment which they support.
956 In particular, a.out format supports a maximum alignment of 4. */
957 if (align
> MAX_OFILE_ALIGNMENT
)
959 warning (0, "alignment of %q+D is greater than maximum object "
960 "file alignment. Using %d", decl
,
961 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
962 align
= MAX_OFILE_ALIGNMENT
;
965 /* On some machines, it is good to increase alignment sometimes. */
966 if (! DECL_USER_ALIGN (decl
))
968 #ifdef DATA_ALIGNMENT
969 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
970 /* Don't increase alignment too much for TLS variables - TLS space
972 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
975 #ifdef CONSTANT_ALIGNMENT
976 if (DECL_INITIAL (decl
) != 0 && DECL_INITIAL (decl
) != error_mark_node
)
978 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
980 /* Don't increase alignment too much for TLS variables - TLS space
982 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
988 /* Reset the alignment in case we have made it tighter, so we can benefit
989 from it in get_pointer_alignment. */
990 DECL_ALIGN (decl
) = align
;
993 /* Return the section into which the given VAR_DECL or CONST_DECL
994 should be placed. PREFER_NOSWITCH_P is true if a noswitch
995 section should be used wherever possible. */
998 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1000 addr_space_t as
= ADDR_SPACE_GENERIC
;
1003 if (TREE_TYPE (decl
) != error_mark_node
)
1004 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1006 if (DECL_COMMON (decl
))
1008 /* If the decl has been given an explicit section name, or it resides
1009 in a non-generic address space, then it isn't common, and shouldn't
1010 be handled as such. */
1011 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1012 && ADDR_SPACE_GENERIC_P (as
));
1013 if (DECL_THREAD_LOCAL_P (decl
))
1014 return tls_comm_section
;
1015 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1016 return comm_section
;
1019 if (DECL_INITIAL (decl
) == error_mark_node
)
1020 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1021 else if (DECL_INITIAL (decl
))
1022 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1026 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1027 if (IN_NAMED_SECTION (decl
))
1028 return get_named_section (decl
, NULL
, reloc
);
1030 if (ADDR_SPACE_GENERIC_P (as
)
1031 && !DECL_THREAD_LOCAL_P (decl
)
1032 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1033 && bss_initializer_p (decl
))
1035 if (!TREE_PUBLIC (decl
)
1036 && !(flag_asan
&& asan_protect_global (decl
)))
1037 return lcomm_section
;
1038 if (bss_noswitch_section
)
1039 return bss_noswitch_section
;
1042 return targetm
.asm_out
.select_section (decl
, reloc
, DECL_ALIGN (decl
));
1045 /* Return the block into which object_block DECL should be placed. */
1047 static struct object_block
*
1048 get_block_for_decl (tree decl
)
1052 if (TREE_CODE (decl
) == VAR_DECL
)
1054 /* The object must be defined in this translation unit. */
1055 if (DECL_EXTERNAL (decl
))
1058 /* There's no point using object blocks for something that is
1059 isolated by definition. */
1060 if (DECL_ONE_ONLY (decl
))
1064 /* We can only calculate block offsets if the decl has a known
1066 if (DECL_SIZE_UNIT (decl
) == NULL
)
1068 if (!host_integerp (DECL_SIZE_UNIT (decl
), 1))
1071 /* Find out which section should contain DECL. We cannot put it into
1072 an object block if it requires a standalone definition. */
1073 if (TREE_CODE (decl
) == VAR_DECL
)
1074 align_variable (decl
, 0);
1075 sect
= get_variable_section (decl
, true);
1076 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1079 return get_block_for_section (sect
);
1082 /* Make sure block symbol SYMBOL is in block BLOCK. */
1085 change_symbol_block (rtx symbol
, struct object_block
*block
)
1087 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1089 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1090 SYMBOL_REF_BLOCK (symbol
) = block
;
1094 /* Return true if it is possible to put DECL in an object_block. */
1097 use_blocks_for_decl_p (tree decl
)
1099 /* Only data DECLs can be placed into object blocks. */
1100 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1103 /* Detect decls created by dw2_force_const_mem. Such decls are
1104 special because DECL_INITIAL doesn't specify the decl's true value.
1105 dw2_output_indirect_constants will instead call assemble_variable
1106 with dont_output_data set to 1 and then print the contents itself. */
1107 if (DECL_INITIAL (decl
) == decl
)
1110 /* If this decl is an alias, then we don't want to emit a
1112 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)))
1115 return targetm
.use_blocks_for_decl_p (decl
);
1118 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1119 have static storage duration. In other words, it should not be an
1120 automatic variable, including PARM_DECLs.
1122 There is, however, one exception: this function handles variables
1123 explicitly placed in a particular register by the user.
1125 This is never called for PARM_DECL nodes. */
1128 make_decl_rtl (tree decl
)
1130 const char *name
= 0;
1134 /* Check that we are not being given an automatic variable. */
1135 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1136 && TREE_CODE (decl
) != RESULT_DECL
);
1138 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1139 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1140 || TREE_STATIC (decl
)
1141 || TREE_PUBLIC (decl
)
1142 || DECL_EXTERNAL (decl
)
1143 || DECL_REGISTER (decl
));
1145 /* And that we were not given a type or a label. */
1146 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1147 && TREE_CODE (decl
) != LABEL_DECL
);
1149 /* For a duplicate declaration, we can be called twice on the
1150 same DECL node. Don't discard the RTL already made. */
1151 if (DECL_RTL_SET_P (decl
))
1153 /* If the old RTL had the wrong mode, fix the mode. */
1154 x
= DECL_RTL (decl
);
1155 if (GET_MODE (x
) != DECL_MODE (decl
))
1156 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1158 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1161 /* ??? Another way to do this would be to maintain a hashed
1162 table of such critters. Instead of adding stuff to a DECL
1163 to give certain attributes to it, we could use an external
1164 hash map from DECL to set of attributes. */
1166 /* Let the target reassign the RTL if it wants.
1167 This is necessary, for example, when one machine specific
1168 decl attribute overrides another. */
1169 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1171 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1172 on the new decl information. */
1174 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1175 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1176 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1178 /* Make this function static known to the mudflap runtime. */
1179 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1180 mudflap_enqueue_decl (decl
);
1185 /* If this variable belongs to the global constant pool, retrieve the
1186 pre-computed RTL or recompute it in LTO mode. */
1187 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_IN_CONSTANT_POOL (decl
))
1189 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1193 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
1195 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1196 && DECL_REGISTER (decl
))
1198 error ("register name not specified for %q+D", decl
);
1200 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1202 const char *asmspec
= name
+1;
1203 enum machine_mode mode
= DECL_MODE (decl
);
1204 reg_number
= decode_reg_name (asmspec
);
1205 /* First detect errors in declaring global registers. */
1206 if (reg_number
== -1)
1207 error ("register name not specified for %q+D", decl
);
1208 else if (reg_number
< 0)
1209 error ("invalid register name for %q+D", decl
);
1210 else if (mode
== BLKmode
)
1211 error ("data type of %q+D isn%'t suitable for a register",
1213 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1214 error ("the register specified for %q+D cannot be accessed"
1215 " by the current target", decl
);
1216 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1217 error ("the register specified for %q+D is not general enough"
1218 " to be used as a register variable", decl
);
1219 else if (!HARD_REGNO_MODE_OK (reg_number
, mode
))
1220 error ("register specified for %q+D isn%'t suitable for data type",
1222 /* Now handle properly declared static register variables. */
1227 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1229 DECL_INITIAL (decl
) = 0;
1230 error ("global register variable has initial value");
1232 if (TREE_THIS_VOLATILE (decl
))
1233 warning (OPT_Wvolatile_register_var
,
1234 "optimization may eliminate reads and/or "
1235 "writes to register variables");
1237 /* If the user specified one of the eliminables registers here,
1238 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1239 confused with that register and be eliminated. This usage is
1240 somewhat suspect... */
1242 SET_DECL_RTL (decl
, gen_rtx_raw_REG (mode
, reg_number
));
1243 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1244 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1246 if (TREE_STATIC (decl
))
1248 /* Make this register global, so not usable for anything
1250 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1251 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1252 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1254 nregs
= hard_regno_nregs
[reg_number
][mode
];
1256 globalize_reg (decl
, reg_number
+ --nregs
);
1259 /* As a register variable, it has no section. */
1263 /* Now handle ordinary static variables and functions (in memory).
1264 Also handle vars declared register invalidly. */
1265 else if (name
[0] == '*')
1267 #ifdef REGISTER_PREFIX
1268 if (strlen (REGISTER_PREFIX
) != 0)
1270 reg_number
= decode_reg_name (name
);
1271 if (reg_number
>= 0 || reg_number
== -3)
1272 error ("register name given for non-register variable %q+D", decl
);
1277 /* Specifying a section attribute on a variable forces it into a
1278 non-.bss section, and thus it cannot be common. */
1279 /* FIXME: In general this code should not be necessary because
1280 visibility pass is doing the same work. But notice_global_symbol
1281 is called early and it needs to make DECL_RTL to get the name.
1282 we take care of recomputing the DECL_RTL after visibility is changed. */
1283 if (TREE_CODE (decl
) == VAR_DECL
1284 && DECL_SECTION_NAME (decl
) != NULL_TREE
1285 && DECL_INITIAL (decl
) == NULL_TREE
1286 && DECL_COMMON (decl
))
1287 DECL_COMMON (decl
) = 0;
1289 /* Variables can't be both common and weak. */
1290 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1291 DECL_COMMON (decl
) = 0;
1293 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1294 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1297 enum machine_mode address_mode
= Pmode
;
1298 if (TREE_TYPE (decl
) != error_mark_node
)
1300 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1301 address_mode
= targetm
.addr_space
.address_mode (as
);
1303 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1305 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1306 SET_SYMBOL_REF_DECL (x
, decl
);
1308 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1309 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1310 set_mem_attributes (x
, decl
, 1);
1311 SET_DECL_RTL (decl
, x
);
1313 /* Optionally set flags or add text to the name to record information
1314 such as that it is a function name.
1315 If the name is changed, the macro ASM_OUTPUT_LABELREF
1316 will have to know how to strip this information. */
1317 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1319 /* Make this function static known to the mudflap runtime. */
1320 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1321 mudflap_enqueue_decl (decl
);
1324 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1325 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1329 make_decl_rtl_for_debug (tree decl
)
1331 unsigned int save_aliasing_flag
, save_mudflap_flag
;
1334 if (DECL_RTL_SET_P (decl
))
1335 return DECL_RTL (decl
);
1337 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1338 call new_alias_set. If running with -fcompare-debug, sometimes
1339 we do not want to create alias sets that will throw the alias
1340 numbers off in the comparison dumps. So... clearing
1341 flag_strict_aliasing will keep new_alias_set() from creating a
1342 new set. It is undesirable to register decl with mudflap
1343 in this case as well. */
1344 save_aliasing_flag
= flag_strict_aliasing
;
1345 flag_strict_aliasing
= 0;
1346 save_mudflap_flag
= flag_mudflap
;
1349 rtl
= DECL_RTL (decl
);
1350 /* Reset DECL_RTL back, as various parts of the compiler expects
1351 DECL_RTL set meaning it is actually going to be output. */
1352 SET_DECL_RTL (decl
, NULL
);
1354 flag_strict_aliasing
= save_aliasing_flag
;
1355 flag_mudflap
= save_mudflap_flag
;
1360 /* Output a string of literal assembler code
1361 for an `asm' keyword used between functions. */
1364 assemble_asm (tree string
)
1369 if (TREE_CODE (string
) == ADDR_EXPR
)
1370 string
= TREE_OPERAND (string
, 0);
1372 p
= TREE_STRING_POINTER (string
);
1373 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1376 /* Write the address of the entity given by SYMBOL to SEC. */
1378 assemble_addr_to_section (rtx symbol
, section
*sec
)
1380 switch_to_section (sec
);
1381 assemble_align (POINTER_SIZE
);
1382 assemble_integer (symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1385 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1386 not) section for PRIORITY. */
1388 get_cdtor_priority_section (int priority
, bool constructor_p
)
1392 /* ??? This only works reliably with the GNU linker. */
1393 sprintf (buf
, "%s.%.5u",
1394 constructor_p
? ".ctors" : ".dtors",
1395 /* Invert the numbering so the linker puts us in the proper
1396 order; constructors are run from right to left, and the
1397 linker sorts in increasing order. */
1398 MAX_INIT_PRIORITY
- priority
);
1399 return get_section (buf
, SECTION_WRITE
, NULL
);
1403 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1407 if (priority
!= DEFAULT_INIT_PRIORITY
)
1408 sec
= get_cdtor_priority_section (priority
,
1409 /*constructor_p=*/false);
1411 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1413 assemble_addr_to_section (symbol
, sec
);
1416 #ifdef DTORS_SECTION_ASM_OP
1418 default_dtor_section_asm_out_destructor (rtx symbol
,
1419 int priority ATTRIBUTE_UNUSED
)
1421 assemble_addr_to_section (symbol
, dtors_section
);
1426 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1430 if (priority
!= DEFAULT_INIT_PRIORITY
)
1431 sec
= get_cdtor_priority_section (priority
,
1432 /*constructor_p=*/true);
1434 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1436 assemble_addr_to_section (symbol
, sec
);
1439 #ifdef CTORS_SECTION_ASM_OP
1441 default_ctor_section_asm_out_constructor (rtx symbol
,
1442 int priority ATTRIBUTE_UNUSED
)
1444 assemble_addr_to_section (symbol
, ctors_section
);
1448 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1449 a nonzero value if the constant pool should be output before the
1450 start of the function, or a zero value if the pool should output
1451 after the end of the function. The default is to put it before the
1454 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1455 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1458 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1459 to be output to assembler.
1460 Set first_global_object_name and weak_global_object_name as appropriate. */
1463 notice_global_symbol (tree decl
)
1465 const char **type
= &first_global_object_name
;
1467 if (first_global_object_name
1468 || !TREE_PUBLIC (decl
)
1469 || DECL_EXTERNAL (decl
)
1470 || !DECL_NAME (decl
)
1471 || (TREE_CODE (decl
) != FUNCTION_DECL
1472 && (TREE_CODE (decl
) != VAR_DECL
1473 || (DECL_COMMON (decl
)
1474 && (DECL_INITIAL (decl
) == 0
1475 || DECL_INITIAL (decl
) == error_mark_node
))))
1476 || !MEM_P (DECL_RTL (decl
)))
1479 /* We win when global object is found, but it is useful to know about weak
1480 symbol as well so we can produce nicer unique names. */
1481 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1482 type
= &weak_global_object_name
;
1488 rtx decl_rtl
= DECL_RTL (decl
);
1490 p
= targetm
.strip_name_encoding (XSTR (XEXP (decl_rtl
, 0), 0));
1491 name
= ggc_strdup (p
);
1497 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1498 current function goes into the cold section, so that targets can use
1499 current_function_section during RTL expansion. DECL describes the
1503 decide_function_section (tree decl
)
1505 first_function_block_is_cold
= false;
1507 if (flag_reorder_blocks_and_partition
)
1508 /* We will decide in assemble_start_function. */
1511 if (DECL_SECTION_NAME (decl
))
1513 struct cgraph_node
*node
= cgraph_get_node (current_function_decl
);
1514 /* Calls to function_section rely on first_function_block_is_cold
1516 first_function_block_is_cold
= (node
1518 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1521 in_cold_section_p
= first_function_block_is_cold
;
1524 /* Output assembler code for the constant pool of a function and associated
1525 with defining the name of the function. DECL describes the function.
1526 NAME is the function's name. For the constant pool, we use the current
1527 constant pool data. */
1530 assemble_start_function (tree decl
, const char *fnname
)
1533 char tmp_label
[100];
1534 bool hot_label_written
= false;
1536 if (flag_reorder_blocks_and_partition
)
1538 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1539 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1540 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1541 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1542 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1543 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1544 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1545 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1550 crtl
->subsections
.hot_section_label
= NULL
;
1551 crtl
->subsections
.cold_section_label
= NULL
;
1552 crtl
->subsections
.hot_section_end_label
= NULL
;
1553 crtl
->subsections
.cold_section_end_label
= NULL
;
1556 /* The following code does not need preprocessing in the assembler. */
1560 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1561 output_constant_pool (fnname
, decl
);
1563 /* Make sure the not and cold text (code) sections are properly
1564 aligned. This is necessary here in the case where the function
1565 has both hot and cold sections, because we don't want to re-set
1566 the alignment when the section switch happens mid-function. */
1568 if (flag_reorder_blocks_and_partition
)
1570 first_function_block_is_cold
= false;
1572 switch_to_section (unlikely_text_section ());
1573 assemble_align (DECL_ALIGN (decl
));
1574 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1576 /* When the function starts with a cold section, we need to explicitly
1577 align the hot section and write out the hot section label.
1578 But if the current function is a thunk, we do not have a CFG. */
1580 && BB_PARTITION (ENTRY_BLOCK_PTR
->next_bb
) == BB_COLD_PARTITION
)
1582 switch_to_section (text_section
);
1583 assemble_align (DECL_ALIGN (decl
));
1584 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1585 hot_label_written
= true;
1586 first_function_block_is_cold
= true;
1588 in_cold_section_p
= first_function_block_is_cold
;
1592 /* Switch to the correct text section for the start of the function. */
1594 switch_to_section (function_section (decl
));
1595 if (flag_reorder_blocks_and_partition
1596 && !hot_label_written
)
1597 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1599 /* Tell assembler to move to target machine's alignment for functions. */
1600 align
= floor_log2 (DECL_ALIGN (decl
) / BITS_PER_UNIT
);
1603 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1606 /* Handle a user-specified function alignment.
1607 Note that we still need to align to DECL_ALIGN, as above,
1608 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1609 if (! DECL_USER_ALIGN (decl
)
1610 && align_functions_log
> align
1611 && optimize_function_for_speed_p (cfun
))
1613 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1614 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1615 align_functions_log
, align_functions
- 1);
1617 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1621 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1622 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1625 if (!DECL_IGNORED_P (decl
))
1626 (*debug_hooks
->begin_function
) (decl
);
1628 /* Make function name accessible from other files, if appropriate. */
1630 if (TREE_PUBLIC (decl
))
1632 notice_global_symbol (decl
);
1634 globalize_decl (decl
);
1636 maybe_assemble_visibility (decl
);
1639 if (DECL_PRESERVE_P (decl
))
1640 targetm
.asm_out
.mark_decl_preserved (fnname
);
1642 /* Do any machine/system dependent processing of the function name. */
1643 #ifdef ASM_DECLARE_FUNCTION_NAME
1644 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1646 /* Standard thing is just output label for the function. */
1647 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1648 #endif /* ASM_DECLARE_FUNCTION_NAME */
1650 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1651 saw_no_split_stack
= true;
1654 /* Output assembler code associated with defining the size of the
1655 function. DECL describes the function. NAME is the function's name. */
1658 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1660 #ifdef ASM_DECLARE_FUNCTION_SIZE
1661 /* We could have switched section in the middle of the function. */
1662 if (flag_reorder_blocks_and_partition
)
1663 switch_to_section (function_section (decl
));
1664 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1666 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1668 output_constant_pool (fnname
, decl
);
1669 switch_to_section (function_section (decl
)); /* need to switch back */
1671 /* Output labels for end of hot/cold text sections (to be used by
1673 if (flag_reorder_blocks_and_partition
)
1675 section
*save_text_section
;
1677 save_text_section
= in_section
;
1678 switch_to_section (unlikely_text_section ());
1679 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1680 if (first_function_block_is_cold
)
1681 switch_to_section (text_section
);
1683 switch_to_section (function_section (decl
));
1684 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1685 switch_to_section (save_text_section
);
1689 /* Assemble code to leave SIZE bytes of zeros. */
1692 assemble_zeros (unsigned HOST_WIDE_INT size
)
1694 /* Do no output if -fsyntax-only. */
1695 if (flag_syntax_only
)
1698 #ifdef ASM_NO_SKIP_IN_TEXT
1699 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1700 so we must output 0s explicitly in the text section. */
1701 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1703 unsigned HOST_WIDE_INT i
;
1704 for (i
= 0; i
< size
; i
++)
1705 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1710 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1713 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1716 assemble_align (int align
)
1718 if (align
> BITS_PER_UNIT
)
1720 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1724 /* Assemble a string constant with the specified C string as contents. */
1727 assemble_string (const char *p
, int size
)
1732 /* If the string is very long, split it up. */
1736 int thissize
= size
- pos
;
1737 if (thissize
> maximum
)
1740 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1748 /* A noswitch_section_callback for lcomm_section. */
1751 emit_local (tree decl ATTRIBUTE_UNUSED
,
1752 const char *name ATTRIBUTE_UNUSED
,
1753 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1754 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1756 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1757 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1758 size
, DECL_ALIGN (decl
));
1760 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1761 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1764 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1769 /* A noswitch_section_callback for bss_noswitch_section. */
1771 #if defined ASM_OUTPUT_ALIGNED_BSS
1773 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1774 const char *name ATTRIBUTE_UNUSED
,
1775 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1776 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1778 #if defined ASM_OUTPUT_ALIGNED_BSS
1779 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
, DECL_ALIGN (decl
));
1785 /* A noswitch_section_callback for comm_section. */
1788 emit_common (tree decl ATTRIBUTE_UNUSED
,
1789 const char *name ATTRIBUTE_UNUSED
,
1790 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1791 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1793 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1794 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1795 size
, DECL_ALIGN (decl
));
1797 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1798 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1801 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1806 /* A noswitch_section_callback for tls_comm_section. */
1809 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1810 const char *name ATTRIBUTE_UNUSED
,
1811 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1812 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1814 #ifdef ASM_OUTPUT_TLS_COMMON
1815 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
1818 sorry ("thread-local COMMON data not implemented");
1823 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1824 NAME is the name of DECL's SYMBOL_REF. */
1827 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
)
1829 unsigned HOST_WIDE_INT size
, rounded
;
1831 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
1834 if (flag_asan
&& asan_protect_global (decl
))
1835 size
+= asan_red_zone_size (size
);
1837 /* Don't allocate zero bytes of common,
1838 since that means "undefined external" in the linker. */
1842 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1843 so that each uninitialized object starts on such a boundary. */
1844 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
1845 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
1846 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
1848 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
1849 && (unsigned HOST_WIDE_INT
) DECL_ALIGN_UNIT (decl
) > rounded
)
1850 warning (0, "requested alignment for %q+D is greater than "
1851 "implemented alignment of %wu", decl
, rounded
);
1854 /* A subroutine of assemble_variable. Output the label and contents of
1855 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1856 is as for assemble_variable. */
1859 assemble_variable_contents (tree decl
, const char *name
,
1860 bool dont_output_data
)
1862 /* Do any machine/system dependent processing of the object. */
1863 #ifdef ASM_DECLARE_OBJECT_NAME
1864 last_assemble_variable_decl
= decl
;
1865 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
1867 /* Standard thing is just output label for the object. */
1868 ASM_OUTPUT_LABEL (asm_out_file
, name
);
1869 #endif /* ASM_DECLARE_OBJECT_NAME */
1871 if (!dont_output_data
)
1873 if (DECL_INITIAL (decl
)
1874 && DECL_INITIAL (decl
) != error_mark_node
1875 && !initializer_zerop (DECL_INITIAL (decl
)))
1876 /* Output the actual data. */
1877 output_constant (DECL_INITIAL (decl
),
1878 tree_low_cst (DECL_SIZE_UNIT (decl
), 1),
1881 /* Leave space for it. */
1882 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl
), 1));
1886 /* Assemble everything that is needed for a variable or function declaration.
1887 Not used for automatic variables, and not used for function definitions.
1888 Should not be called for variables of incomplete structure type.
1890 TOP_LEVEL is nonzero if this variable has file scope.
1891 AT_END is nonzero if this is the special handling, at end of compilation,
1892 to define things that have had only tentative definitions.
1893 DONT_OUTPUT_DATA if nonzero means don't actually output the
1894 initial value (that will be done by the caller). */
1897 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
1898 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
1901 rtx decl_rtl
, symbol
;
1903 bool asan_protected
= false;
1905 /* This function is supposed to handle VARIABLES. Ensure we have one. */
1906 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
1908 /* Emulated TLS had better not get this far. */
1909 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
1911 last_assemble_variable_decl
= 0;
1913 /* Normally no need to say anything here for external references,
1914 since assemble_external is called by the language-specific code
1915 when a declaration is first seen. */
1917 if (DECL_EXTERNAL (decl
))
1920 /* Do nothing for global register variables. */
1921 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
1923 TREE_ASM_WRITTEN (decl
) = 1;
1927 /* If type was incomplete when the variable was declared,
1928 see if it is complete now. */
1930 if (DECL_SIZE (decl
) == 0)
1931 layout_decl (decl
, 0);
1933 /* Still incomplete => don't allocate it; treat the tentative defn
1934 (which is what it must have been) as an `extern' reference. */
1936 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
1938 error ("storage size of %q+D isn%'t known", decl
);
1939 TREE_ASM_WRITTEN (decl
) = 1;
1943 /* The first declaration of a variable that comes through this function
1944 decides whether it is global (in C, has external linkage)
1945 or local (in C, has internal linkage). So do nothing more
1946 if this function has already run. */
1948 if (TREE_ASM_WRITTEN (decl
))
1951 /* Make sure targetm.encode_section_info is invoked before we set
1953 decl_rtl
= DECL_RTL (decl
);
1955 TREE_ASM_WRITTEN (decl
) = 1;
1957 /* Do no output if -fsyntax-only. */
1958 if (flag_syntax_only
)
1961 if (! dont_output_data
1962 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
1964 error ("size of variable %q+D is too large", decl
);
1968 gcc_assert (MEM_P (decl_rtl
));
1969 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
1970 symbol
= XEXP (decl_rtl
, 0);
1972 /* If this symbol belongs to the tree constant pool, output the constant
1973 if it hasn't already been written. */
1974 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
1976 tree decl
= SYMBOL_REF_DECL (symbol
);
1977 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
1978 output_constant_def_contents (symbol
);
1984 name
= XSTR (symbol
, 0);
1985 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
1986 notice_global_symbol (decl
);
1988 /* Compute the alignment of this data. */
1990 align_variable (decl
, dont_output_data
);
1993 && asan_protect_global (decl
))
1995 asan_protected
= true;
1996 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
1997 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
2000 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2002 if (TREE_PUBLIC (decl
))
2003 maybe_assemble_visibility (decl
);
2005 if (DECL_PRESERVE_P (decl
))
2006 targetm
.asm_out
.mark_decl_preserved (name
);
2008 /* First make the assembler name(s) global if appropriate. */
2009 sect
= get_variable_section (decl
, false);
2010 if (TREE_PUBLIC (decl
)
2011 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2012 globalize_decl (decl
);
2014 /* Output any data that we will need to use the address of. */
2015 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2016 output_addressed_constants (DECL_INITIAL (decl
));
2018 /* dbxout.c needs to know this. */
2019 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2020 DECL_IN_TEXT_SECTION (decl
) = 1;
2022 /* If the decl is part of an object_block, make sure that the decl
2023 has been positioned within its block, but do not write out its
2024 definition yet. output_object_blocks will do that later. */
2025 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2027 gcc_assert (!dont_output_data
);
2028 place_block_symbol (symbol
);
2030 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2031 assemble_noswitch_variable (decl
, name
, sect
);
2034 switch_to_section (sect
);
2035 if (DECL_ALIGN (decl
) > BITS_PER_UNIT
)
2036 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (DECL_ALIGN_UNIT (decl
)));
2037 assemble_variable_contents (decl
, name
, dont_output_data
);
2040 unsigned HOST_WIDE_INT
int size
2041 = tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
2042 assemble_zeros (asan_red_zone_size (size
));
2047 /* Return 1 if type TYPE contains any pointers. */
2050 contains_pointers_p (tree type
)
2052 switch (TREE_CODE (type
))
2055 case REFERENCE_TYPE
:
2056 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2057 so I'll play safe and return 1. */
2063 case QUAL_UNION_TYPE
:
2066 /* For a type that has fields, see if the fields have pointers. */
2067 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2068 if (TREE_CODE (fields
) == FIELD_DECL
2069 && contains_pointers_p (TREE_TYPE (fields
)))
2075 /* An array type contains pointers if its element type does. */
2076 return contains_pointers_p (TREE_TYPE (type
));
2083 /* We delay assemble_external processing until
2084 the compilation unit is finalized. This is the best we can do for
2085 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2086 it all the way to final. See PR 17982 for further discussion. */
2087 static GTY(()) tree pending_assemble_externals
;
2089 #ifdef ASM_OUTPUT_EXTERNAL
2090 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2091 As a result, assemble_external can be called after the list of externals
2092 is processed and the pointer set destroyed. */
2093 static bool pending_assemble_externals_processed
;
2095 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2096 TREE_LIST in assemble_external. */
2097 static struct pointer_set_t
*pending_assemble_externals_set
;
2099 /* True if DECL is a function decl for which no out-of-line copy exists.
2100 It is assumed that DECL's assembler name has been set. */
2103 incorporeal_function_p (tree decl
)
2105 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2109 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2110 && (DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
2111 || DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA_WITH_ALIGN
))
2114 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2115 /* Atomic or sync builtins which have survived this far will be
2116 resolved externally and therefore are not incorporeal. */
2117 if (strncmp (name
, "__builtin_", 10) == 0)
2123 /* Actually do the tests to determine if this is necessary, and invoke
2124 ASM_OUTPUT_EXTERNAL. */
2126 assemble_external_real (tree decl
)
2128 rtx rtl
= DECL_RTL (decl
);
2130 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2131 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2132 && !incorporeal_function_p (decl
))
2134 /* Some systems do require some output. */
2135 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2136 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2142 process_pending_assemble_externals (void)
2144 #ifdef ASM_OUTPUT_EXTERNAL
2146 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2147 assemble_external_real (TREE_VALUE (list
));
2149 pending_assemble_externals
= 0;
2150 pending_assemble_externals_processed
= true;
2151 pointer_set_destroy (pending_assemble_externals_set
);
2155 /* This TREE_LIST contains any weak symbol declarations waiting
2157 static GTY(()) tree weak_decls
;
2159 /* Output something to declare an external symbol to the assembler,
2160 and qualifiers such as weakness. (Most assemblers don't need
2161 extern declaration, so we normally output nothing.) Do nothing if
2162 DECL is not external. */
2165 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2167 /* Make sure that the ASM_OUT_FILE is open.
2168 If it's not, we should not be calling this function. */
2169 gcc_assert (asm_out_file
);
2171 /* In a perfect world, the following condition would be true.
2172 Sadly, the Java and Go front ends emit assembly *from the front end*,
2173 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2175 /* This function should only be called if we are expanding, or have
2177 Ideally, only final.c would be calling this function, but it is
2178 not clear whether that would break things somehow. See PR 17982
2179 for further discussion. */
2180 gcc_assert (cgraph_state
== CGRAPH_STATE_EXPANSION
2181 || cgraph_state
== CGRAPH_STATE_FINISHED
);
2184 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2187 /* We want to output annotation for weak and external symbols at
2188 very last to check if they are references or not. */
2190 if (TARGET_SUPPORTS_WEAK
2192 /* TREE_STATIC is a weird and abused creature which is not
2193 generally the right test for whether an entity has been
2194 locally emitted, inlined or otherwise not-really-extern, but
2195 for declarations that can be weak, it happens to be
2197 && !TREE_STATIC (decl
)
2198 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2199 && value_member (decl
, weak_decls
) == NULL_TREE
)
2200 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2202 #ifdef ASM_OUTPUT_EXTERNAL
2203 if (pending_assemble_externals_processed
)
2205 assemble_external_real (decl
);
2209 if (! pointer_set_insert (pending_assemble_externals_set
, decl
))
2210 pending_assemble_externals
= tree_cons (NULL
, decl
,
2211 pending_assemble_externals
);
2215 /* Similar, for calling a library function FUN. */
2218 assemble_external_libcall (rtx fun
)
2220 /* Declare library function name external when first used, if nec. */
2221 if (! SYMBOL_REF_USED (fun
))
2223 SYMBOL_REF_USED (fun
) = 1;
2224 targetm
.asm_out
.external_libcall (fun
);
2228 /* Assemble a label named NAME. */
2231 assemble_label (FILE *file
, const char *name
)
2233 ASM_OUTPUT_LABEL (file
, name
);
2236 /* Set the symbol_referenced flag for ID. */
2238 mark_referenced (tree id
)
2240 TREE_SYMBOL_REFERENCED (id
) = 1;
2243 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2245 mark_decl_referenced (tree decl
)
2247 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2249 /* Extern inline functions don't become needed when referenced.
2250 If we know a method will be emitted in other TU and no new
2251 functions can be marked reachable, just use the external
2253 struct cgraph_node
*node
= cgraph_get_create_node (decl
);
2254 if (!DECL_EXTERNAL (decl
)
2255 && !node
->local
.finalized
)
2256 cgraph_mark_force_output_node (node
);
2258 else if (TREE_CODE (decl
) == VAR_DECL
)
2260 struct varpool_node
*node
= varpool_node_for_decl (decl
);
2261 /* C++ frontend use mark_decl_references to force COMDAT variables
2262 to be output that might appear dead otherwise. */
2263 node
->symbol
.force_output
= true;
2265 /* else do nothing - we can get various sorts of CST nodes here,
2266 which do not need to be marked. */
2270 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2271 until we find an identifier that is not itself a transparent alias.
2272 Modify the alias passed to it by reference (and all aliases on the
2273 way to the ultimate target), such that they do not have to be
2274 followed again, and return the ultimate target of the alias
2278 ultimate_transparent_alias_target (tree
*alias
)
2280 tree target
= *alias
;
2282 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
2284 gcc_assert (TREE_CHAIN (target
));
2285 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
2286 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
2287 && ! TREE_CHAIN (target
));
2294 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2295 starts with a *, the rest of NAME is output verbatim. Otherwise
2296 NAME is transformed in a target-specific way (usually by the
2297 addition of an underscore). */
2300 assemble_name_raw (FILE *file
, const char *name
)
2303 fputs (&name
[1], file
);
2305 ASM_OUTPUT_LABELREF (file
, name
);
2308 /* Like assemble_name_raw, but should be used when NAME might refer to
2309 an entity that is also represented as a tree (like a function or
2310 variable). If NAME does refer to such an entity, that entity will
2311 be marked as referenced. */
2314 assemble_name (FILE *file
, const char *name
)
2316 const char *real_name
;
2319 real_name
= targetm
.strip_name_encoding (name
);
2321 id
= maybe_get_identifier (real_name
);
2326 mark_referenced (id
);
2327 ultimate_transparent_alias_target (&id
);
2329 name
= IDENTIFIER_POINTER (id
);
2330 gcc_assert (! TREE_CHAIN (id
));
2333 assemble_name_raw (file
, name
);
2336 /* Allocate SIZE bytes writable static space with a gensym name
2337 and return an RTX to refer to its address. */
2340 assemble_static_space (unsigned HOST_WIDE_INT size
)
2343 const char *namestring
;
2346 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2348 namestring
= ggc_strdup (name
);
2350 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2351 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2353 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2354 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2357 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2358 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2361 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2362 so that each uninitialized object starts on such a boundary. */
2363 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2364 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2365 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2366 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2367 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2368 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2375 /* Assemble the static constant template for function entry trampolines.
2376 This is done at most once per compilation.
2377 Returns an RTX for the address of the template. */
2379 static GTY(()) rtx initial_trampoline
;
2382 assemble_trampoline_template (void)
2389 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2391 if (initial_trampoline
)
2392 return initial_trampoline
;
2394 /* By default, put trampoline templates in read-only data section. */
2396 #ifdef TRAMPOLINE_SECTION
2397 switch_to_section (TRAMPOLINE_SECTION
);
2399 switch_to_section (readonly_data_section
);
2402 /* Write the assembler code to define one. */
2403 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2405 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2407 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2408 targetm
.asm_out
.trampoline_template (asm_out_file
);
2410 /* Record the rtl to refer to it. */
2411 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2412 name
= ggc_strdup (label
);
2413 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2414 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2416 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2417 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2418 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2420 return initial_trampoline
;
2423 /* A and B are either alignments or offsets. Return the minimum alignment
2424 that may be assumed after adding the two together. */
2426 static inline unsigned
2427 min_align (unsigned int a
, unsigned int b
)
2429 return (a
| b
) & -(a
| b
);
2432 /* Return the assembler directive for creating a given kind of integer
2433 object. SIZE is the number of bytes in the object and ALIGNED_P
2434 indicates whether it is known to be aligned. Return NULL if the
2435 assembly dialect has no such directive.
2437 The returned string should be printed at the start of a new line and
2438 be followed immediately by the object's initial value. */
2441 integer_asm_op (int size
, int aligned_p
)
2443 struct asm_int_op
*ops
;
2446 ops
= &targetm
.asm_out
.aligned_op
;
2448 ops
= &targetm
.asm_out
.unaligned_op
;
2453 return targetm
.asm_out
.byte_op
;
2467 /* Use directive OP to assemble an integer object X. Print OP at the
2468 start of the line, followed immediately by the value of X. */
2471 assemble_integer_with_op (const char *op
, rtx x
)
2473 fputs (op
, asm_out_file
);
2474 output_addr_const (asm_out_file
, x
);
2475 fputc ('\n', asm_out_file
);
2478 /* The default implementation of the asm_out.integer target hook. */
2481 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2482 unsigned int size ATTRIBUTE_UNUSED
,
2483 int aligned_p ATTRIBUTE_UNUSED
)
2485 const char *op
= integer_asm_op (size
, aligned_p
);
2486 /* Avoid GAS bugs for large values. Specifically negative values whose
2487 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2488 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE
/ BITS_PER_UNIT
)
2490 return op
&& (assemble_integer_with_op (op
, x
), true);
2493 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2494 the alignment of the integer in bits. Return 1 if we were able to output
2495 the constant, otherwise 0. We must be able to output the constant,
2496 if FORCE is nonzero. */
2499 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2503 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2505 /* See if the target hook can handle this kind of object. */
2506 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2509 /* If the object is a multi-byte one, try splitting it up. Split
2510 it into words it if is multi-word, otherwise split it into bytes. */
2513 enum machine_mode omode
, imode
;
2514 unsigned int subalign
;
2515 unsigned int subsize
, i
;
2516 enum mode_class mclass
;
2518 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2519 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2520 if (GET_CODE (x
) == CONST_FIXED
)
2521 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2525 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2526 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2528 for (i
= 0; i
< size
; i
+= subsize
)
2530 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2531 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2537 /* If we've printed some of it, but not all of it, there's no going
2542 gcc_assert (!force
);
2548 assemble_real (REAL_VALUE_TYPE d
, enum machine_mode mode
, unsigned int align
)
2550 long data
[4] = {0, 0, 0, 0};
2552 int bitsize
, nelts
, nunits
, units_per
;
2554 /* This is hairy. We have a quantity of known size. real_to_target
2555 will put it into an array of *host* longs, 32 bits per element
2556 (even if long is more than 32 bits). We need to determine the
2557 number of array elements that are occupied (nelts) and the number
2558 of *target* min-addressable units that will be occupied in the
2559 object file (nunits). We cannot assume that 32 divides the
2560 mode's bitsize (size * BITS_PER_UNIT) evenly.
2562 size * BITS_PER_UNIT is used here to make sure that padding bits
2563 (which might appear at either end of the value; real_to_target
2564 will include the padding bits in its output array) are included. */
2566 nunits
= GET_MODE_SIZE (mode
);
2567 bitsize
= nunits
* BITS_PER_UNIT
;
2568 nelts
= CEIL (bitsize
, 32);
2569 units_per
= 32 / BITS_PER_UNIT
;
2571 real_to_target (data
, &d
, mode
);
2573 /* Put out the first word with the specified alignment. */
2574 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2575 nunits
-= units_per
;
2577 /* Subsequent words need only 32-bit alignment. */
2578 align
= min_align (align
, 32);
2580 for (i
= 1; i
< nelts
; i
++)
2582 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2583 nunits
-= units_per
;
2587 /* Given an expression EXP with a constant value,
2588 reduce it to the sum of an assembler symbol and an integer.
2589 Store them both in the structure *VALUE.
2590 EXP must be reducible. */
2594 HOST_WIDE_INT offset
;
2598 decode_addr_const (tree exp
, struct addr_const
*value
)
2600 tree target
= TREE_OPERAND (exp
, 0);
2606 if (TREE_CODE (target
) == COMPONENT_REF
2607 && host_integerp (byte_position (TREE_OPERAND (target
, 1)), 0))
2609 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2610 target
= TREE_OPERAND (target
, 0);
2612 else if (TREE_CODE (target
) == ARRAY_REF
2613 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2615 offset
+= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target
)), 1)
2616 * tree_low_cst (TREE_OPERAND (target
, 1), 0));
2617 target
= TREE_OPERAND (target
, 0);
2619 else if (TREE_CODE (target
) == MEM_REF
2620 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2622 offset
+= mem_ref_offset (target
).low
;
2623 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2625 else if (TREE_CODE (target
) == INDIRECT_REF
2626 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2627 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2629 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2634 switch (TREE_CODE (target
))
2638 x
= DECL_RTL (target
);
2642 x
= gen_rtx_MEM (FUNCTION_MODE
,
2643 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2652 x
= output_constant_def (target
, 1);
2659 gcc_assert (MEM_P (x
));
2663 value
->offset
= offset
;
2667 static GTY((param_is (struct constant_descriptor_tree
)))
2668 htab_t const_desc_htab
;
2670 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2672 /* Constant pool accessor function. */
2675 constant_pool_htab (void)
2677 return const_desc_htab
;
2680 /* Compute a hash code for a constant expression. */
2683 const_desc_hash (const void *ptr
)
2685 return ((const struct constant_descriptor_tree
*)ptr
)->hash
;
2689 const_hash_1 (const tree exp
)
2694 enum tree_code code
= TREE_CODE (exp
);
2696 /* Either set P and LEN to the address and len of something to hash and
2697 exit the switch or return a value. */
2702 p
= (char *) &TREE_INT_CST (exp
);
2703 len
= sizeof TREE_INT_CST (exp
);
2707 return real_hash (TREE_REAL_CST_PTR (exp
));
2710 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2713 p
= TREE_STRING_POINTER (exp
);
2714 len
= TREE_STRING_LENGTH (exp
);
2718 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2719 + const_hash_1 (TREE_IMAGPART (exp
)));
2725 hi
= 7 + VECTOR_CST_NELTS (exp
);
2727 for (i
= 0; i
< VECTOR_CST_NELTS (exp
); ++i
)
2728 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ELT (exp
, i
));
2735 unsigned HOST_WIDE_INT idx
;
2738 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2740 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2742 hi
= hi
* 603 + const_hash_1 (value
);
2750 struct addr_const value
;
2752 decode_addr_const (exp
, &value
);
2753 switch (GET_CODE (value
.base
))
2756 /* Don't hash the address of the SYMBOL_REF;
2757 only use the offset and the symbol name. */
2759 p
= XSTR (value
.base
, 0);
2760 for (i
= 0; p
[i
] != 0; i
++)
2761 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2765 hi
= value
.offset
+ CODE_LABEL_NUMBER (XEXP (value
.base
, 0)) * 13;
2775 case POINTER_PLUS_EXPR
:
2777 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2778 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2781 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2784 /* A language specific constant. Just hash the code. */
2788 /* Compute hashing function. */
2790 for (i
= 0; i
< len
; i
++)
2791 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2796 /* Wrapper of compare_constant, for the htab interface. */
2798 const_desc_eq (const void *p1
, const void *p2
)
2800 const struct constant_descriptor_tree
*const c1
2801 = (const struct constant_descriptor_tree
*) p1
;
2802 const struct constant_descriptor_tree
*const c2
2803 = (const struct constant_descriptor_tree
*) p2
;
2804 if (c1
->hash
!= c2
->hash
)
2806 return compare_constant (c1
->value
, c2
->value
);
2809 /* Compare t1 and t2, and return 1 only if they are known to result in
2810 the same bit pattern on output. */
2813 compare_constant (const tree t1
, const tree t2
)
2815 enum tree_code typecode
;
2817 if (t1
== NULL_TREE
)
2818 return t2
== NULL_TREE
;
2819 if (t2
== NULL_TREE
)
2822 if (TREE_CODE (t1
) != TREE_CODE (t2
))
2825 switch (TREE_CODE (t1
))
2828 /* Integer constants are the same only if the same width of type. */
2829 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2831 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2833 return tree_int_cst_equal (t1
, t2
);
2836 /* Real constants are the same only if the same width of type. */
2837 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2840 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
2843 /* Fixed constants are the same only if the same width of type. */
2844 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2847 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
2850 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2853 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
2854 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
2855 TREE_STRING_LENGTH (t1
)));
2858 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
2859 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
2865 if (VECTOR_CST_NELTS (t1
) != VECTOR_CST_NELTS (t2
))
2868 for (i
= 0; i
< VECTOR_CST_NELTS (t1
); ++i
)
2869 if (!compare_constant (VECTOR_CST_ELT (t1
, i
),
2870 VECTOR_CST_ELT (t2
, i
)))
2878 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
2879 unsigned HOST_WIDE_INT idx
;
2881 typecode
= TREE_CODE (TREE_TYPE (t1
));
2882 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
2885 if (typecode
== ARRAY_TYPE
)
2887 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
2888 /* For arrays, check that the sizes all match. */
2889 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
2891 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
2896 /* For record and union constructors, require exact type
2898 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
2902 v1
= CONSTRUCTOR_ELTS (t1
);
2903 v2
= CONSTRUCTOR_ELTS (t2
);
2904 if (vec_safe_length (v1
) != vec_safe_length (v2
))
2907 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
2909 constructor_elt
*c1
= &(*v1
)[idx
];
2910 constructor_elt
*c2
= &(*v2
)[idx
];
2912 /* Check that each value is the same... */
2913 if (!compare_constant (c1
->value
, c2
->value
))
2915 /* ... and that they apply to the same fields! */
2916 if (typecode
== ARRAY_TYPE
)
2918 if (!compare_constant (c1
->index
, c2
->index
))
2923 if (c1
->index
!= c2
->index
)
2934 struct addr_const value1
, value2
;
2938 decode_addr_const (t1
, &value1
);
2939 decode_addr_const (t2
, &value2
);
2941 if (value1
.offset
!= value2
.offset
)
2944 code
= GET_CODE (value1
.base
);
2945 if (code
!= GET_CODE (value2
.base
))
2951 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
2955 ret
= (CODE_LABEL_NUMBER (XEXP (value1
.base
, 0))
2956 == CODE_LABEL_NUMBER (XEXP (value2
.base
, 0)));
2966 case POINTER_PLUS_EXPR
:
2969 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
2970 && compare_constant(TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
2973 case VIEW_CONVERT_EXPR
:
2974 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
2983 /* Make a copy of the whole tree structure for a constant. This
2984 handles the same types of nodes that compare_constant handles. */
2987 copy_constant (tree exp
)
2989 switch (TREE_CODE (exp
))
2992 /* For ADDR_EXPR, we do not want to copy the decl whose address
2993 is requested. We do want to copy constants though. */
2994 if (CONSTANT_CLASS_P (TREE_OPERAND (exp
, 0)))
2995 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
2996 copy_constant (TREE_OPERAND (exp
, 0)));
2998 return copy_node (exp
);
3004 return copy_node (exp
);
3007 return build_complex (TREE_TYPE (exp
),
3008 copy_constant (TREE_REALPART (exp
)),
3009 copy_constant (TREE_IMAGPART (exp
)));
3012 case POINTER_PLUS_EXPR
:
3014 return build2 (TREE_CODE (exp
), TREE_TYPE (exp
),
3015 copy_constant (TREE_OPERAND (exp
, 0)),
3016 copy_constant (TREE_OPERAND (exp
, 1)));
3019 case VIEW_CONVERT_EXPR
:
3020 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3021 copy_constant (TREE_OPERAND (exp
, 0)));
3024 return build_vector (TREE_TYPE (exp
), VECTOR_CST_ELTS (exp
));
3028 tree copy
= copy_node (exp
);
3029 vec
<constructor_elt
, va_gc
> *v
;
3030 unsigned HOST_WIDE_INT idx
;
3031 tree purpose
, value
;
3033 vec_alloc (v
, vec_safe_length (CONSTRUCTOR_ELTS (exp
)));
3034 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp
), idx
, purpose
, value
)
3036 constructor_elt ce
= {purpose
, copy_constant (value
)};
3039 CONSTRUCTOR_ELTS (copy
) = v
;
3048 /* Return the section into which constant EXP should be placed. */
3051 get_constant_section (tree exp
, unsigned int align
)
3053 return targetm
.asm_out
.select_section (exp
,
3054 compute_reloc_for_constant (exp
),
3058 /* Return the size of constant EXP in bytes. */
3060 static HOST_WIDE_INT
3061 get_constant_size (tree exp
)
3065 size
= int_size_in_bytes (TREE_TYPE (exp
));
3066 if (TREE_CODE (exp
) == STRING_CST
)
3067 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3071 /* Subroutine of output_constant_def:
3072 No constant equal to EXP is known to have been output.
3073 Make a constant descriptor to enter EXP in the hash table.
3074 Assign the label number and construct RTL to refer to the
3075 constant's location in memory.
3076 Caller is responsible for updating the hash table. */
3078 static struct constant_descriptor_tree
*
3079 build_constant_desc (tree exp
)
3081 struct constant_descriptor_tree
*desc
;
3087 desc
= ggc_alloc_constant_descriptor_tree ();
3088 desc
->value
= copy_constant (exp
);
3090 /* Propagate marked-ness to copied constant. */
3091 if (flag_mudflap
&& mf_marked_p (exp
))
3092 mf_mark (desc
->value
);
3094 /* Create a string containing the label name, in LABEL. */
3095 labelno
= const_labelno
++;
3096 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3098 /* Construct the VAR_DECL associated with the constant. */
3099 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3101 DECL_ARTIFICIAL (decl
) = 1;
3102 DECL_IGNORED_P (decl
) = 1;
3103 TREE_READONLY (decl
) = 1;
3104 TREE_STATIC (decl
) = 1;
3105 TREE_ADDRESSABLE (decl
) = 1;
3106 /* We don't set the RTL yet as this would cause varpool to assume that the
3107 variable is referenced. Moreover, it would just be dropped in LTO mode.
3108 Instead we set the flag that will be recognized in make_decl_rtl. */
3109 DECL_IN_CONSTANT_POOL (decl
) = 1;
3110 DECL_INITIAL (decl
) = desc
->value
;
3111 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3112 architectures so use DATA_ALIGNMENT as well, except for strings. */
3113 if (TREE_CODE (exp
) == STRING_CST
)
3115 #ifdef CONSTANT_ALIGNMENT
3116 DECL_ALIGN (decl
) = CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
));
3120 align_variable (decl
, 0);
3122 /* Now construct the SYMBOL_REF and the MEM. */
3123 if (use_object_blocks_p ())
3125 section
*sect
= get_constant_section (exp
, DECL_ALIGN (decl
));
3126 symbol
= create_block_symbol (ggc_strdup (label
),
3127 get_block_for_section (sect
), -1);
3130 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3131 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3132 SET_SYMBOL_REF_DECL (symbol
, decl
);
3133 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3135 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3136 set_mem_attributes (rtl
, exp
, 1);
3137 set_mem_alias_set (rtl
, 0);
3138 set_mem_alias_set (rtl
, const_alias_set
);
3140 /* We cannot share RTX'es in pool entries.
3141 Mark this piece of RTL as required for unsharing. */
3142 RTX_FLAG (rtl
, used
) = 1;
3144 /* Set flags or add text to the name to record information, such as
3145 that it is a local symbol. If the name is changed, the macro
3146 ASM_OUTPUT_LABELREF will have to know how to strip this
3147 information. This call might invalidate our local variable
3148 SYMBOL; we can't use it afterward. */
3149 targetm
.encode_section_info (exp
, rtl
, true);
3156 /* Return an rtx representing a reference to constant data in memory
3157 for the constant expression EXP.
3159 If assembler code for such a constant has already been output,
3160 return an rtx to refer to it.
3161 Otherwise, output such a constant in memory
3162 and generate an rtx for it.
3164 If DEFER is nonzero, this constant can be deferred and output only
3165 if referenced in the function after all optimizations.
3167 `const_desc_table' records which constants already have label strings. */
3170 output_constant_def (tree exp
, int defer
)
3172 struct constant_descriptor_tree
*desc
;
3173 struct constant_descriptor_tree key
;
3176 /* Look up EXP in the table of constant descriptors. If we didn't find
3177 it, create a new one. */
3179 key
.hash
= const_hash_1 (exp
);
3180 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3182 desc
= (struct constant_descriptor_tree
*) *loc
;
3185 desc
= build_constant_desc (exp
);
3186 desc
->hash
= key
.hash
;
3190 maybe_output_constant_def_contents (desc
, defer
);
3194 /* Subroutine of output_constant_def: Decide whether or not we need to
3195 output the constant DESC now, and if so, do it. */
3197 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3200 rtx symbol
= XEXP (desc
->rtl
, 0);
3201 tree exp
= desc
->value
;
3203 if (flag_syntax_only
)
3206 if (TREE_ASM_WRITTEN (exp
))
3207 /* Already output; don't do it again. */
3210 /* We can always defer constants as long as the context allows
3214 /* Increment n_deferred_constants if it exists. It needs to be at
3215 least as large as the number of constants actually referred to
3216 by the function. If it's too small we'll stop looking too early
3217 and fail to emit constants; if it's too large we'll only look
3218 through the entire function when we could have stopped earlier. */
3220 n_deferred_constants
++;
3224 output_constant_def_contents (symbol
);
3227 /* Subroutine of output_constant_def_contents. Output the definition
3228 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3229 constant's alignment in bits. */
3232 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3236 size
= get_constant_size (exp
);
3238 /* Do any machine/system dependent processing of the constant. */
3239 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3241 /* Output the value of EXP. */
3242 output_constant (exp
, size
, align
);
3245 /* We must output the constant data referred to by SYMBOL; do so. */
3248 output_constant_def_contents (rtx symbol
)
3250 tree decl
= SYMBOL_REF_DECL (symbol
);
3251 tree exp
= DECL_INITIAL (decl
);
3253 bool asan_protected
= false;
3255 /* Make sure any other constants whose addresses appear in EXP
3256 are assigned label numbers. */
3257 output_addressed_constants (exp
);
3259 /* We are no longer deferring this constant. */
3260 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3262 if (flag_asan
&& TREE_CODE (exp
) == STRING_CST
3263 && asan_protect_global (exp
))
3265 asan_protected
= true;
3266 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
3267 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
3270 /* If the constant is part of an object block, make sure that the
3271 decl has been positioned within its block, but do not write out
3272 its definition yet. output_object_blocks will do that later. */
3273 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3274 place_block_symbol (symbol
);
3277 align
= DECL_ALIGN (decl
);
3278 switch_to_section (get_constant_section (exp
, align
));
3279 if (align
> BITS_PER_UNIT
)
3280 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3281 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3284 HOST_WIDE_INT size
= get_constant_size (exp
);
3285 assemble_zeros (asan_red_zone_size (size
));
3289 mudflap_enqueue_constant (exp
);
3292 /* Look up EXP in the table of constant descriptors. Return the rtl
3293 if it has been emitted, else null. */
3296 lookup_constant_def (tree exp
)
3298 struct constant_descriptor_tree
*desc
;
3299 struct constant_descriptor_tree key
;
3302 key
.hash
= const_hash_1 (exp
);
3303 desc
= (struct constant_descriptor_tree
*)
3304 htab_find_with_hash (const_desc_htab
, &key
, key
.hash
);
3306 return (desc
? desc
->rtl
: NULL_RTX
);
3309 /* Return a tree representing a reference to constant data in memory
3310 for the constant expression EXP.
3312 This is the counterpart of output_constant_def at the Tree level. */
3315 tree_output_constant_def (tree exp
)
3317 struct constant_descriptor_tree
*desc
, key
;
3321 /* Look up EXP in the table of constant descriptors. If we didn't find
3322 it, create a new one. */
3324 key
.hash
= const_hash_1 (exp
);
3325 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3327 desc
= (struct constant_descriptor_tree
*) *loc
;
3330 desc
= build_constant_desc (exp
);
3331 desc
->hash
= key
.hash
;
3335 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3336 varpool_finalize_decl (decl
);
3340 /* Used in the hash tables to avoid outputting the same constant
3341 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3342 are output once per function, not once per file. */
3343 /* ??? Only a few targets need per-function constant pools. Most
3344 can use one per-file pool. Should add a targetm bit to tell the
3347 struct GTY(()) rtx_constant_pool
{
3348 /* Pointers to first and last constant in pool, as ordered by offset. */
3349 struct constant_descriptor_rtx
*first
;
3350 struct constant_descriptor_rtx
*last
;
3352 /* Hash facility for making memory-constants from constant rtl-expressions.
3353 It is used on RISC machines where immediate integer arguments and
3354 constant addresses are restricted so that such constants must be stored
3356 htab_t
GTY((param_is (struct constant_descriptor_rtx
))) const_rtx_htab
;
3358 /* Current offset in constant pool (does not include any
3359 machine-specific header). */
3360 HOST_WIDE_INT offset
;
3363 struct GTY((chain_next ("%h.next"))) constant_descriptor_rtx
{
3364 struct constant_descriptor_rtx
*next
;
3368 HOST_WIDE_INT offset
;
3370 enum machine_mode mode
;
3376 /* Hash and compare functions for const_rtx_htab. */
3379 const_desc_rtx_hash (const void *ptr
)
3381 const struct constant_descriptor_rtx
*const desc
3382 = (const struct constant_descriptor_rtx
*) ptr
;
3387 const_desc_rtx_eq (const void *a
, const void *b
)
3389 const struct constant_descriptor_rtx
*const x
3390 = (const struct constant_descriptor_rtx
*) a
;
3391 const struct constant_descriptor_rtx
*const y
3392 = (const struct constant_descriptor_rtx
*) b
;
3394 if (x
->mode
!= y
->mode
)
3396 return rtx_equal_p (x
->constant
, y
->constant
);
3399 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3402 const_rtx_hash_1 (rtx
*xp
, void *data
)
3404 unsigned HOST_WIDE_INT hwi
;
3405 enum machine_mode mode
;
3411 code
= GET_CODE (x
);
3412 mode
= GET_MODE (x
);
3413 h
= (hashval_t
) code
* 1048573 + mode
;
3421 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3422 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3425 h
^= (hashval_t
) hwi
;
3426 for (i
= 1; i
< n
; ++i
)
3429 h
^= (hashval_t
) hwi
;
3435 if (mode
== VOIDmode
)
3437 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3441 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3445 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3451 for (i
= XVECLEN (x
, 0); i
-- > 0; )
3452 h
= h
* 251 + const_rtx_hash_1 (&XVECEXP (x
, 0, i
), data
);
3457 h
^= htab_hash_string (XSTR (x
, 0));
3461 h
= h
* 251 + CODE_LABEL_NUMBER (XEXP (x
, 0));
3465 case UNSPEC_VOLATILE
:
3466 h
= h
* 251 + XINT (x
, 1);
3473 hp
= (hashval_t
*) data
;
3474 *hp
= *hp
* 509 + h
;
3478 /* Compute a hash value for X, which should be a constant. */
3481 const_rtx_hash (rtx x
)
3484 for_each_rtx (&x
, const_rtx_hash_1
, &h
);
3489 /* Create and return a new rtx constant pool. */
3491 static struct rtx_constant_pool
*
3492 create_constant_pool (void)
3494 struct rtx_constant_pool
*pool
;
3496 pool
= ggc_alloc_rtx_constant_pool ();
3497 pool
->const_rtx_htab
= htab_create_ggc (31, const_desc_rtx_hash
,
3498 const_desc_rtx_eq
, NULL
);
3505 /* Initialize constant pool hashing for a new function. */
3508 init_varasm_status (void)
3510 crtl
->varasm
.pool
= create_constant_pool ();
3511 crtl
->varasm
.deferred_constants
= 0;
3514 /* Given a MINUS expression, simplify it if both sides
3515 include the same symbol. */
3518 simplify_subtraction (rtx x
)
3520 rtx r
= simplify_rtx (x
);
3524 /* Given a constant rtx X, make (or find) a memory constant for its value
3525 and return a MEM rtx to refer to it in memory. */
3528 force_const_mem (enum machine_mode mode
, rtx x
)
3530 struct constant_descriptor_rtx
*desc
, tmp
;
3531 struct rtx_constant_pool
*pool
;
3538 /* If we're not allowed to drop X into the constant pool, don't. */
3539 if (targetm
.cannot_force_const_mem (mode
, x
))
3542 /* Record that this function has used a constant pool entry. */
3543 crtl
->uses_const_pool
= 1;
3545 /* Decide which pool to use. */
3546 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3547 ? shared_constant_pool
3548 : crtl
->varasm
.pool
);
3550 /* Lookup the value in the hashtable. */
3553 hash
= const_rtx_hash (x
);
3554 slot
= htab_find_slot_with_hash (pool
->const_rtx_htab
, &tmp
, hash
, INSERT
);
3555 desc
= (struct constant_descriptor_rtx
*) *slot
;
3557 /* If the constant was already present, return its memory. */
3559 return copy_rtx (desc
->mem
);
3561 /* Otherwise, create a new descriptor. */
3562 desc
= ggc_alloc_constant_descriptor_rtx ();
3565 /* Align the location counter as required by EXP's data type. */
3566 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3567 #ifdef CONSTANT_ALIGNMENT
3569 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3570 if (type
!= NULL_TREE
)
3571 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3575 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3576 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3579 desc
->constant
= copy_rtx (tmp
.constant
);
3580 desc
->offset
= pool
->offset
;
3583 desc
->align
= align
;
3584 desc
->labelno
= const_labelno
;
3587 pool
->offset
+= GET_MODE_SIZE (mode
);
3589 pool
->last
->next
= desc
;
3591 pool
->first
= pool
->last
= desc
;
3594 /* Create a string containing the label name, in LABEL. */
3595 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3598 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3599 the constants pool. */
3600 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3602 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3603 symbol
= create_block_symbol (ggc_strdup (label
),
3604 get_block_for_section (sect
), -1);
3607 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3609 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3610 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3611 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3613 /* Construct the MEM. */
3614 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3615 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3616 set_mem_align (def
, align
);
3618 /* If we're dropping a label to the constant pool, make sure we
3620 if (GET_CODE (x
) == LABEL_REF
)
3621 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3623 return copy_rtx (def
);
3626 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3629 get_pool_constant (rtx addr
)
3631 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3634 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3635 and whether it has been output or not. */
3638 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3640 struct constant_descriptor_rtx
*desc
;
3642 desc
= SYMBOL_REF_CONSTANT (addr
);
3643 *pmarked
= (desc
->mark
!= 0);
3644 return desc
->constant
;
3647 /* Similar, return the mode. */
3650 get_pool_mode (const_rtx addr
)
3652 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3655 /* Return the size of the constant pool. */
3658 get_pool_size (void)
3660 return crtl
->varasm
.pool
->offset
;
3663 /* Worker function for output_constant_pool_1. Emit assembly for X
3664 in MODE with known alignment ALIGN. */
3667 output_constant_pool_2 (enum machine_mode mode
, rtx x
, unsigned int align
)
3669 switch (GET_MODE_CLASS (mode
))
3672 case MODE_DECIMAL_FLOAT
:
3676 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3677 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3678 assemble_real (r
, mode
, align
);
3683 case MODE_PARTIAL_INT
:
3688 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3691 case MODE_VECTOR_FLOAT
:
3692 case MODE_VECTOR_INT
:
3693 case MODE_VECTOR_FRACT
:
3694 case MODE_VECTOR_UFRACT
:
3695 case MODE_VECTOR_ACCUM
:
3696 case MODE_VECTOR_UACCUM
:
3699 enum machine_mode submode
= GET_MODE_INNER (mode
);
3700 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3702 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3703 units
= CONST_VECTOR_NUNITS (x
);
3705 for (i
= 0; i
< units
; i
++)
3707 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3708 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3718 /* Worker function for output_constant_pool. Emit constant DESC,
3719 giving it ALIGN bits of alignment. */
3722 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3729 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3730 whose CODE_LABEL has been deleted. This can occur if a jump table
3731 is eliminated by optimization. If so, write a constant of zero
3732 instead. Note that this can also happen by turning the
3733 CODE_LABEL into a NOTE. */
3734 /* ??? This seems completely and utterly wrong. Certainly it's
3735 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3736 functioning even with INSN_DELETED_P and friends. */
3739 switch (GET_CODE (tmp
))
3742 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3743 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3745 tmp
= XEXP (XEXP (tmp
, 0), 0);
3749 tmp
= XEXP (tmp
, 0);
3750 gcc_assert (!INSN_DELETED_P (tmp
));
3751 gcc_assert (!NOTE_P (tmp
)
3752 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3759 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3760 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3761 align
, desc
->labelno
, done
);
3764 assemble_align (align
);
3766 /* Output the label. */
3767 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3769 /* Output the data. */
3770 output_constant_pool_2 (desc
->mode
, x
, align
);
3772 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3773 sections have proper size. */
3774 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3776 && (in_section
->common
.flags
& SECTION_MERGE
))
3777 assemble_align (align
);
3779 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3785 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3786 to as used. Emit referenced deferred strings. This function can
3787 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3790 mark_constant (rtx
*current_rtx
, void *data ATTRIBUTE_UNUSED
)
3792 rtx x
= *current_rtx
;
3794 if (x
== NULL_RTX
|| GET_CODE (x
) != SYMBOL_REF
)
3797 if (CONSTANT_POOL_ADDRESS_P (x
))
3799 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3800 if (desc
->mark
== 0)
3803 for_each_rtx (&desc
->constant
, mark_constant
, NULL
);
3806 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3808 tree decl
= SYMBOL_REF_DECL (x
);
3809 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
3811 n_deferred_constants
--;
3812 output_constant_def_contents (x
);
3819 /* Look through appropriate parts of INSN, marking all entries in the
3820 constant pool which are actually being used. Entries that are only
3821 referenced by other constants are also marked as used. Emit
3822 deferred strings that are used. */
3825 mark_constants (rtx insn
)
3830 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3831 insns, not any notes that may be attached. We don't want to mark
3832 a constant just because it happens to appear in a REG_EQUIV note. */
3833 if (GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3835 rtx seq
= PATTERN (insn
);
3836 int i
, n
= XVECLEN (seq
, 0);
3837 for (i
= 0; i
< n
; ++i
)
3839 rtx subinsn
= XVECEXP (seq
, 0, i
);
3840 if (INSN_P (subinsn
))
3841 for_each_rtx (&PATTERN (subinsn
), mark_constant
, NULL
);
3845 for_each_rtx (&PATTERN (insn
), mark_constant
, NULL
);
3848 /* Look through the instructions for this function, and mark all the
3849 entries in POOL which are actually being used. Emit deferred constants
3850 which have indeed been used. */
3853 mark_constant_pool (void)
3857 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
3860 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3861 mark_constants (insn
);
3864 /* Write all the constants in POOL. */
3867 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
3869 struct constant_descriptor_rtx
*desc
;
3871 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3874 /* If the constant is part of an object_block, make sure that
3875 the constant has been positioned within its block, but do not
3876 write out its definition yet. output_object_blocks will do
3878 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
3879 && SYMBOL_REF_BLOCK (desc
->sym
))
3880 place_block_symbol (desc
->sym
);
3883 switch_to_section (targetm
.asm_out
.select_rtx_section
3884 (desc
->mode
, desc
->constant
, desc
->align
));
3885 output_constant_pool_1 (desc
, desc
->align
);
3890 /* Mark all constants that are used in the current function, then write
3891 out the function's private constant pool. */
3894 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
3895 tree fndecl ATTRIBUTE_UNUSED
)
3897 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
3899 /* It is possible for gcc to call force_const_mem and then to later
3900 discard the instructions which refer to the constant. In such a
3901 case we do not need to output the constant. */
3902 mark_constant_pool ();
3904 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3905 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3908 output_constant_pool_contents (pool
);
3910 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3911 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3915 /* Write the contents of the shared constant pool. */
3918 output_shared_constant_pool (void)
3920 output_constant_pool_contents (shared_constant_pool
);
3923 /* Determine what kind of relocations EXP may need. */
3926 compute_reloc_for_constant (tree exp
)
3928 int reloc
= 0, reloc2
;
3931 switch (TREE_CODE (exp
))
3935 /* Go inside any operations that get_inner_reference can handle and see
3936 if what's inside is a constant: no need to do anything here for
3937 addresses of variables or functions. */
3938 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3939 tem
= TREE_OPERAND (tem
, 0))
3942 if (TREE_CODE (tem
) == MEM_REF
3943 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
3945 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
3949 if (TREE_PUBLIC (tem
))
3956 case POINTER_PLUS_EXPR
:
3957 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3958 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3962 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3963 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3964 /* The difference of two local labels is computable at link time. */
3965 if (reloc
== 1 && reloc2
== 1)
3972 case VIEW_CONVERT_EXPR
:
3973 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3978 unsigned HOST_WIDE_INT idx
;
3979 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
3981 reloc
|= compute_reloc_for_constant (tem
);
3991 /* Find all the constants whose addresses are referenced inside of EXP,
3992 and make sure assembler code with a label has been output for each one.
3993 Indicate whether an ADDR_EXPR has been encountered. */
3996 output_addressed_constants (tree exp
)
4000 switch (TREE_CODE (exp
))
4004 /* Go inside any operations that get_inner_reference can handle and see
4005 if what's inside is a constant: no need to do anything here for
4006 addresses of variables or functions. */
4007 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4008 tem
= TREE_OPERAND (tem
, 0))
4011 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4012 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4013 tem
= DECL_INITIAL (tem
);
4015 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4016 output_constant_def (tem
, 0);
4018 if (TREE_CODE (tem
) == MEM_REF
)
4019 output_addressed_constants (TREE_OPERAND (tem
, 0));
4023 case POINTER_PLUS_EXPR
:
4025 output_addressed_constants (TREE_OPERAND (exp
, 1));
4029 case VIEW_CONVERT_EXPR
:
4030 output_addressed_constants (TREE_OPERAND (exp
, 0));
4035 unsigned HOST_WIDE_INT idx
;
4036 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4038 output_addressed_constants (tem
);
4047 /* Whether a constructor CTOR is a valid static constant initializer if all
4048 its elements are. This used to be internal to initializer_constant_valid_p
4049 and has been exposed to let other functions like categorize_ctor_elements
4050 evaluate the property while walking a constructor for other purposes. */
4053 constructor_static_from_elts_p (const_tree ctor
)
4055 return (TREE_CONSTANT (ctor
)
4056 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4057 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4058 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4061 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4064 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4065 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4066 which are valid when ENDTYPE is an integer of any size; in
4067 particular, this does not accept a pointer minus a constant. This
4068 returns null_pointer_node if the VALUE is an absolute constant
4069 which can be used to initialize a static variable. Otherwise it
4073 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4077 if (!INTEGRAL_TYPE_P (endtype
))
4080 op0
= TREE_OPERAND (value
, 0);
4081 op1
= TREE_OPERAND (value
, 1);
4083 /* Like STRIP_NOPS except allow the operand mode to widen. This
4084 works around a feature of fold that simplifies (int)(p1 - p2) to
4085 ((int)p1 - (int)p2) under the theory that the narrower operation
4088 while (CONVERT_EXPR_P (op0
)
4089 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4091 tree inner
= TREE_OPERAND (op0
, 0);
4092 if (inner
== error_mark_node
4093 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4094 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4095 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4100 while (CONVERT_EXPR_P (op1
)
4101 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4103 tree inner
= TREE_OPERAND (op1
, 0);
4104 if (inner
== error_mark_node
4105 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4106 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4107 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4112 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4116 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4117 cache
? cache
+ 2 : NULL
);
4118 /* Both initializers must be known. */
4122 && (op0
== null_pointer_node
4123 || TREE_CODE (value
) == MINUS_EXPR
))
4124 return null_pointer_node
;
4126 /* Support differences between labels. */
4127 if (TREE_CODE (op0
) == LABEL_DECL
4128 && TREE_CODE (op1
) == LABEL_DECL
)
4129 return null_pointer_node
;
4131 if (TREE_CODE (op0
) == STRING_CST
4132 && TREE_CODE (op1
) == STRING_CST
4133 && operand_equal_p (op0
, op1
, 1))
4134 return null_pointer_node
;
4140 /* Helper function of initializer_constant_valid_p.
4141 Return nonzero if VALUE is a valid constant-valued expression
4142 for use in initializing a static variable; one that can be an
4143 element of a "constant" initializer.
4145 Return null_pointer_node if the value is absolute;
4146 if it is relocatable, return the variable that determines the relocation.
4147 We assume that VALUE has been folded as much as possible;
4148 therefore, we do not need to check for such things as
4149 arithmetic-combinations of integers.
4151 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4154 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4158 switch (TREE_CODE (value
))
4161 if (constructor_static_from_elts_p (value
))
4163 unsigned HOST_WIDE_INT idx
;
4165 bool absolute
= true;
4167 if (cache
&& cache
[0] == value
)
4169 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4172 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4179 cache
[1] = NULL_TREE
;
4183 if (reloc
!= null_pointer_node
)
4186 /* For a non-absolute relocation, there is no single
4187 variable that can be "the variable that determines the
4192 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4194 return absolute
? null_pointer_node
: error_mark_node
;
4197 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4205 return null_pointer_node
;
4210 tree op0
= staticp (TREE_OPERAND (value
, 0));
4213 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4214 to be a constant, this is old-skool offsetof-like nonsense. */
4215 if (TREE_CODE (op0
) == INDIRECT_REF
4216 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4217 return null_pointer_node
;
4218 /* Taking the address of a nested function involves a trampoline,
4219 unless we don't need or want one. */
4220 if (TREE_CODE (op0
) == FUNCTION_DECL
4221 && DECL_STATIC_CHAIN (op0
)
4222 && !TREE_NO_TRAMPOLINE (value
))
4224 /* "&{...}" requires a temporary to hold the constructed
4226 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4232 case NON_LVALUE_EXPR
:
4233 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4236 case VIEW_CONVERT_EXPR
:
4238 tree src
= TREE_OPERAND (value
, 0);
4239 tree src_type
= TREE_TYPE (src
);
4240 tree dest_type
= TREE_TYPE (value
);
4242 /* Allow view-conversions from aggregate to non-aggregate type only
4243 if the bit pattern is fully preserved afterwards; otherwise, the
4244 RTL expander won't be able to apply a subsequent transformation
4245 to the underlying constructor. */
4246 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4248 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4249 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4254 /* Allow all other kinds of view-conversion. */
4255 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4260 tree src
= TREE_OPERAND (value
, 0);
4261 tree src_type
= TREE_TYPE (src
);
4262 tree dest_type
= TREE_TYPE (value
);
4264 /* Allow conversions between pointer types, floating-point
4265 types, and offset types. */
4266 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4267 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4268 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4269 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4270 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4272 /* Allow length-preserving conversions between integer types. */
4273 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4274 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4275 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4277 /* Allow conversions between other integer types only if
4279 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4281 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4282 if (inner
== null_pointer_node
)
4283 return null_pointer_node
;
4287 /* Allow (int) &foo provided int is as wide as a pointer. */
4288 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4289 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4290 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4292 /* Likewise conversions from int to pointers, but also allow
4293 conversions from 0. */
4294 if ((POINTER_TYPE_P (dest_type
)
4295 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4296 && INTEGRAL_TYPE_P (src_type
))
4298 if (TREE_CODE (src
) == INTEGER_CST
4299 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4300 return null_pointer_node
;
4301 if (integer_zerop (src
))
4302 return null_pointer_node
;
4303 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4304 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4307 /* Allow conversions to struct or union types if the value
4309 if (TREE_CODE (dest_type
) == RECORD_TYPE
4310 || TREE_CODE (dest_type
) == UNION_TYPE
)
4311 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4315 case POINTER_PLUS_EXPR
:
4317 /* Any valid floating-point constants will have been folded by now;
4318 with -frounding-math we hit this with addition of two constants. */
4319 if (TREE_CODE (endtype
) == REAL_TYPE
)
4321 if (cache
&& cache
[0] == value
)
4323 if (! INTEGRAL_TYPE_P (endtype
)
4324 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4326 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4328 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4331 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4332 endtype
, ncache
+ 2);
4333 /* If either term is absolute, use the other term's relocation. */
4334 if (valid0
== null_pointer_node
)
4336 else if (valid1
== null_pointer_node
)
4338 /* Support narrowing pointer differences. */
4340 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4344 /* Support narrowing pointer differences. */
4345 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4354 if (TREE_CODE (endtype
) == REAL_TYPE
)
4356 if (cache
&& cache
[0] == value
)
4358 if (! INTEGRAL_TYPE_P (endtype
)
4359 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4361 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4363 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4366 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4367 endtype
, ncache
+ 2);
4368 /* Win if second argument is absolute. */
4369 if (valid1
== null_pointer_node
)
4371 /* Win if both arguments have the same relocation.
4372 Then the value is absolute. */
4373 else if (valid0
== valid1
&& valid0
!= 0)
4374 ret
= null_pointer_node
;
4375 /* Since GCC guarantees that string constants are unique in the
4376 generated code, a subtraction between two copies of the same
4377 constant string is absolute. */
4378 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4379 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4380 && operand_equal_p (valid0
, valid1
, 1))
4381 ret
= null_pointer_node
;
4382 /* Support narrowing differences. */
4384 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4388 /* Support narrowing differences. */
4389 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4404 /* Return nonzero if VALUE is a valid constant-valued expression
4405 for use in initializing a static variable; one that can be an
4406 element of a "constant" initializer.
4408 Return null_pointer_node if the value is absolute;
4409 if it is relocatable, return the variable that determines the relocation.
4410 We assume that VALUE has been folded as much as possible;
4411 therefore, we do not need to check for such things as
4412 arithmetic-combinations of integers. */
4414 initializer_constant_valid_p (tree value
, tree endtype
)
4416 return initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4419 /* Return true if VALUE is a valid constant-valued expression
4420 for use in initializing a static bit-field; one that can be
4421 an element of a "constant" initializer. */
4424 initializer_constant_valid_for_bitfield_p (tree value
)
4426 /* For bitfields we support integer constants or possibly nested aggregates
4428 switch (TREE_CODE (value
))
4432 unsigned HOST_WIDE_INT idx
;
4435 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4436 if (!initializer_constant_valid_for_bitfield_p (elt
))
4445 case VIEW_CONVERT_EXPR
:
4446 case NON_LVALUE_EXPR
:
4448 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4457 /* output_constructor outer state of relevance in recursive calls, typically
4458 for nested aggregate bitfields. */
4461 unsigned int bit_offset
; /* current position in ... */
4462 int byte
; /* ... the outer byte buffer. */
4465 static unsigned HOST_WIDE_INT
4466 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int,
4469 /* Output assembler code for constant EXP to FILE, with no label.
4470 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4471 Assumes output_addressed_constants has been done on EXP already.
4473 Generate exactly SIZE bytes of assembler data, padding at the end
4474 with zeros if necessary. SIZE must always be specified.
4476 SIZE is important for structure constructors,
4477 since trailing members may have been omitted from the constructor.
4478 It is also important for initialization of arrays from string constants
4479 since the full length of the string constant might not be wanted.
4480 It is also needed for initialization of unions, where the initializer's
4481 type is just one member, and that may not be as long as the union.
4483 There a case in which we would fail to output exactly SIZE bytes:
4484 for a structure constructor that wants to produce more than SIZE bytes.
4485 But such constructors will never be generated for any possible input.
4487 ALIGN is the alignment of the data in bits. */
4490 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4492 enum tree_code code
;
4493 unsigned HOST_WIDE_INT thissize
;
4495 if (size
== 0 || flag_syntax_only
)
4498 /* See if we're trying to initialize a pointer in a non-default mode
4499 to the address of some declaration somewhere. If the target says
4500 the mode is valid for pointers, assume the target has a way of
4502 if (TREE_CODE (exp
) == NOP_EXPR
4503 && POINTER_TYPE_P (TREE_TYPE (exp
))
4504 && targetm
.addr_space
.valid_pointer_mode
4505 (TYPE_MODE (TREE_TYPE (exp
)),
4506 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4508 tree saved_type
= TREE_TYPE (exp
);
4510 /* Peel off any intermediate conversions-to-pointer for valid
4512 while (TREE_CODE (exp
) == NOP_EXPR
4513 && POINTER_TYPE_P (TREE_TYPE (exp
))
4514 && targetm
.addr_space
.valid_pointer_mode
4515 (TYPE_MODE (TREE_TYPE (exp
)),
4516 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4517 exp
= TREE_OPERAND (exp
, 0);
4519 /* If what we're left with is the address of something, we can
4520 convert the address to the final type and output it that
4522 if (TREE_CODE (exp
) == ADDR_EXPR
)
4523 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4524 /* Likewise for constant ints. */
4525 else if (TREE_CODE (exp
) == INTEGER_CST
)
4526 exp
= build_int_cst_wide (saved_type
, TREE_INT_CST_LOW (exp
),
4527 TREE_INT_CST_HIGH (exp
));
4531 /* Eliminate any conversions since we'll be outputting the underlying
4533 while (CONVERT_EXPR_P (exp
)
4534 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4535 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4537 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4538 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4540 /* Make sure eliminating the conversion is really a no-op, except with
4541 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4542 union types to allow for Ada unchecked unions. */
4543 if (type_size
> op_size
4544 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4545 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4546 /* Keep the conversion. */
4549 exp
= TREE_OPERAND (exp
, 0);
4552 code
= TREE_CODE (TREE_TYPE (exp
));
4553 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4555 /* Allow a constructor with no elements for any data type.
4556 This means to fill the space with zeros. */
4557 if (TREE_CODE (exp
) == CONSTRUCTOR
4558 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4560 assemble_zeros (size
);
4564 if (TREE_CODE (exp
) == FDESC_EXPR
)
4566 #ifdef ASM_OUTPUT_FDESC
4567 HOST_WIDE_INT part
= tree_low_cst (TREE_OPERAND (exp
, 1), 0);
4568 tree decl
= TREE_OPERAND (exp
, 0);
4569 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4576 /* Now output the underlying data. If we've handling the padding, return.
4577 Otherwise, break and ensure SIZE is the size written. */
4584 case REFERENCE_TYPE
:
4586 case FIXED_POINT_TYPE
:
4587 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4588 EXPAND_INITIALIZER
),
4589 MIN (size
, thissize
), align
, 0))
4590 error ("initializer for integer/fixed-point value is too complicated");
4594 if (TREE_CODE (exp
) != REAL_CST
)
4595 error ("initializer for floating value is not a floating constant");
4597 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4601 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4602 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4603 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4608 switch (TREE_CODE (exp
))
4611 output_constructor (exp
, size
, align
, NULL
);
4614 thissize
= MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
),
4616 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4622 unsigned int i
, nalign
;
4623 enum machine_mode inner
;
4625 inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4626 nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4628 elt_size
= GET_MODE_SIZE (inner
);
4630 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
);
4631 thissize
= elt_size
;
4632 for (i
= 1; i
< VECTOR_CST_NELTS (exp
); ++i
)
4634 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
);
4635 thissize
+= elt_size
;
4646 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4647 output_constructor (exp
, size
, align
, NULL
);
4657 if (size
> thissize
)
4658 assemble_zeros (size
- thissize
);
4662 /* Subroutine of output_constructor, used for computing the size of
4663 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4664 type with an unspecified upper bound. */
4666 static unsigned HOST_WIDE_INT
4667 array_size_for_constructor (tree val
)
4670 unsigned HOST_WIDE_INT cnt
;
4671 tree index
, value
, tmp
;
4674 /* This code used to attempt to handle string constants that are not
4675 arrays of single-bytes, but nothing else does, so there's no point in
4677 if (TREE_CODE (val
) == STRING_CST
)
4678 return TREE_STRING_LENGTH (val
);
4680 max_index
= NULL_TREE
;
4681 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4683 if (TREE_CODE (index
) == RANGE_EXPR
)
4684 index
= TREE_OPERAND (index
, 1);
4685 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4689 if (max_index
== NULL_TREE
)
4692 /* Compute the total number of array elements. */
4693 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4694 i
= tree_to_double_int (max_index
) - tree_to_double_int (tmp
);
4695 i
+= double_int_one
;
4697 /* Multiply by the array element unit size to find number of bytes. */
4698 i
*= tree_to_double_int (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4700 gcc_assert (i
.fits_uhwi ());
4704 /* Other datastructures + helpers for output_constructor. */
4706 /* output_constructor local state to support interaction with helpers. */
4710 /* Received arguments. */
4711 tree exp
; /* Constructor expression. */
4712 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4713 unsigned int align
; /* Known initial alignment. */
4715 /* Constructor expression data. */
4716 tree type
; /* Expression type. */
4717 tree field
; /* Current field decl in a record. */
4718 tree min_index
; /* Lower bound if specified for an array. */
4720 /* Output processing state. */
4721 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4722 bool byte_buffer_in_use
; /* Whether byte ... */
4723 int byte
; /* ... contains part of a bitfield byte yet to
4726 int last_relative_index
; /* Implicit or explicit index of the last
4727 array element output within a bitfield. */
4728 /* Current element. */
4729 tree val
; /* Current element value. */
4730 tree index
; /* Current element index. */
4734 /* Helper for output_constructor. From the current LOCAL state, output a
4735 RANGE_EXPR element. */
4738 output_constructor_array_range (oc_local_state
*local
)
4740 unsigned HOST_WIDE_INT fieldsize
4741 = int_size_in_bytes (TREE_TYPE (local
->type
));
4743 HOST_WIDE_INT lo_index
4744 = tree_low_cst (TREE_OPERAND (local
->index
, 0), 0);
4745 HOST_WIDE_INT hi_index
4746 = tree_low_cst (TREE_OPERAND (local
->index
, 1), 0);
4747 HOST_WIDE_INT index
;
4750 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4752 for (index
= lo_index
; index
<= hi_index
; index
++)
4754 /* Output the element's initial value. */
4755 if (local
->val
== NULL_TREE
)
4756 assemble_zeros (fieldsize
);
4758 output_constant (local
->val
, fieldsize
, align2
);
4760 /* Count its size. */
4761 local
->total_bytes
+= fieldsize
;
4765 /* Helper for output_constructor. From the current LOCAL state, output a
4766 field element that is not true bitfield or part of an outer one. */
4769 output_constructor_regular_field (oc_local_state
*local
)
4771 /* Field size and position. Since this structure is static, we know the
4772 positions are constant. */
4773 unsigned HOST_WIDE_INT fieldsize
;
4774 HOST_WIDE_INT fieldpos
;
4776 unsigned int align2
;
4778 if (local
->index
!= NULL_TREE
)
4780 /* Perform the index calculation in modulo arithmetic but
4781 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4782 but we are using an unsigned sizetype. */
4783 unsigned prec
= TYPE_PRECISION (sizetype
);
4784 double_int idx
= tree_to_double_int (local
->index
)
4785 - tree_to_double_int (local
->min_index
);
4786 idx
= idx
.sext (prec
);
4787 fieldpos
= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
)), 1)
4790 else if (local
->field
!= NULL_TREE
)
4791 fieldpos
= int_byte_position (local
->field
);
4795 /* Output any buffered-up bit-fields preceding this element. */
4796 if (local
->byte_buffer_in_use
)
4798 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4799 local
->total_bytes
++;
4800 local
->byte_buffer_in_use
= false;
4803 /* Advance to offset of this element.
4804 Note no alignment needed in an array, since that is guaranteed
4805 if each element has the proper size. */
4806 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4807 && fieldpos
!= local
->total_bytes
)
4809 gcc_assert (fieldpos
>= local
->total_bytes
);
4810 assemble_zeros (fieldpos
- local
->total_bytes
);
4811 local
->total_bytes
= fieldpos
;
4814 /* Find the alignment of this element. */
4815 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
4817 /* Determine size this element should occupy. */
4822 /* If this is an array with an unspecified upper bound,
4823 the initializer determines the size. */
4824 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4825 but we cannot do this until the deprecated support for
4826 initializing zero-length array members is removed. */
4827 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
4828 && TYPE_DOMAIN (TREE_TYPE (local
->field
))
4829 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
))))
4831 fieldsize
= array_size_for_constructor (local
->val
);
4832 /* Given a non-empty initialization, this field had
4834 gcc_assert (!fieldsize
|| !DECL_CHAIN (local
->field
));
4837 fieldsize
= tree_low_cst (DECL_SIZE_UNIT (local
->field
), 1);
4840 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
4842 /* Output the element's initial value. */
4843 if (local
->val
== NULL_TREE
)
4844 assemble_zeros (fieldsize
);
4846 output_constant (local
->val
, fieldsize
, align2
);
4848 /* Count its size. */
4849 local
->total_bytes
+= fieldsize
;
4852 /* Helper for output_constructor. From the current LOCAL and OUTER states,
4853 output an element that is a true bitfield or part of an outer one. */
4856 output_constructor_bitfield (oc_local_state
*local
, oc_outer_state
*outer
)
4858 /* Bit size of this element. */
4859 HOST_WIDE_INT ebitsize
4861 ? tree_low_cst (DECL_SIZE (local
->field
), 1)
4862 : tree_low_cst (TYPE_SIZE (TREE_TYPE (local
->type
)), 1));
4864 /* Relative index of this element if this is an array component. */
4865 HOST_WIDE_INT relative_index
4868 ? (tree_low_cst (local
->index
, 0)
4869 - tree_low_cst (local
->min_index
, 0))
4870 : local
->last_relative_index
+ 1)
4873 /* Bit position of this element from the start of the containing
4875 HOST_WIDE_INT constructor_relative_ebitpos
4877 ? int_bit_position (local
->field
)
4878 : ebitsize
* relative_index
);
4880 /* Bit position of this element from the start of a possibly ongoing
4881 outer byte buffer. */
4882 HOST_WIDE_INT byte_relative_ebitpos
4883 = ((outer
? outer
->bit_offset
: 0) + constructor_relative_ebitpos
);
4885 /* From the start of a possibly ongoing outer byte buffer, offsets to
4886 the first bit of this element and to the first bit past the end of
4888 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
4889 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
4891 local
->last_relative_index
= relative_index
;
4893 if (local
->val
== NULL_TREE
)
4894 local
->val
= integer_zero_node
;
4896 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
4897 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
4898 local
->val
= TREE_OPERAND (local
->val
, 0);
4900 if (TREE_CODE (local
->val
) != INTEGER_CST
4901 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
4903 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
4907 /* If this field does not start in this (or, next) byte,
4909 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4911 /* Output remnant of any bit field in previous bytes. */
4912 if (local
->byte_buffer_in_use
)
4914 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4915 local
->total_bytes
++;
4916 local
->byte_buffer_in_use
= false;
4919 /* If still not at proper byte, advance to there. */
4920 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4922 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
4923 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
4924 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
4928 /* Set up the buffer if necessary. */
4929 if (!local
->byte_buffer_in_use
)
4933 local
->byte_buffer_in_use
= true;
4936 /* If this is nested constructor, recurse passing the bit offset and the
4937 pending data, then retrieve the new pending data afterwards. */
4938 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
4940 oc_outer_state output_state
;
4942 output_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
4943 output_state
.byte
= local
->byte
;
4945 += output_constructor (local
->val
, 0, 0, &output_state
);
4946 local
->byte
= output_state
.byte
;
4950 /* Otherwise, we must split the element into pieces that fall within
4951 separate bytes, and combine each byte with previous or following
4953 while (next_offset
< end_offset
)
4957 HOST_WIDE_INT value
;
4958 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
4959 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
4961 /* Advance from byte to byte
4962 within this element when necessary. */
4963 while (next_byte
!= local
->total_bytes
)
4965 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4966 local
->total_bytes
++;
4970 /* Number of bits we can process at once
4971 (all part of the same byte). */
4972 this_time
= MIN (end_offset
- next_offset
,
4973 BITS_PER_UNIT
- next_bit
);
4974 if (BYTES_BIG_ENDIAN
)
4976 /* On big-endian machine, take the most significant bits
4977 first (of the bits that are significant)
4978 and put them into bytes from the most significant end. */
4979 shift
= end_offset
- next_offset
- this_time
;
4981 /* Don't try to take a bunch of bits that cross
4982 the word boundary in the INTEGER_CST. We can
4983 only select bits from the LOW or HIGH part
4985 if (shift
< HOST_BITS_PER_WIDE_INT
4986 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4988 this_time
= shift
+ this_time
- HOST_BITS_PER_WIDE_INT
;
4989 shift
= HOST_BITS_PER_WIDE_INT
;
4992 /* Now get the bits from the appropriate constant word. */
4993 if (shift
< HOST_BITS_PER_WIDE_INT
)
4994 value
= TREE_INT_CST_LOW (local
->val
);
4997 gcc_assert (shift
< HOST_BITS_PER_DOUBLE_INT
);
4998 value
= TREE_INT_CST_HIGH (local
->val
);
4999 shift
-= HOST_BITS_PER_WIDE_INT
;
5002 /* Get the result. This works only when:
5003 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5004 local
->byte
|= (((value
>> shift
)
5005 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5006 << (BITS_PER_UNIT
- this_time
- next_bit
));
5010 /* On little-endian machines,
5011 take first the least significant bits of the value
5012 and pack them starting at the least significant
5013 bits of the bytes. */
5014 shift
= next_offset
- byte_relative_ebitpos
;
5016 /* Don't try to take a bunch of bits that cross
5017 the word boundary in the INTEGER_CST. We can
5018 only select bits from the LOW or HIGH part
5020 if (shift
< HOST_BITS_PER_WIDE_INT
5021 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
5022 this_time
= (HOST_BITS_PER_WIDE_INT
- shift
);
5024 /* Now get the bits from the appropriate constant word. */
5025 if (shift
< HOST_BITS_PER_WIDE_INT
)
5026 value
= TREE_INT_CST_LOW (local
->val
);
5029 gcc_assert (shift
< HOST_BITS_PER_DOUBLE_INT
);
5030 value
= TREE_INT_CST_HIGH (local
->val
);
5031 shift
-= HOST_BITS_PER_WIDE_INT
;
5034 /* Get the result. This works only when:
5035 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5036 local
->byte
|= (((value
>> shift
)
5037 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5041 next_offset
+= this_time
;
5042 local
->byte_buffer_in_use
= true;
5046 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5047 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5048 caller output state of relevance in recursive invocations. */
5050 static unsigned HOST_WIDE_INT
5051 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
5052 unsigned int align
, oc_outer_state
* outer
)
5054 unsigned HOST_WIDE_INT cnt
;
5055 constructor_elt
*ce
;
5057 oc_local_state local
;
5059 /* Setup our local state to communicate with helpers. */
5062 local
.align
= align
;
5064 local
.total_bytes
= 0;
5065 local
.byte_buffer_in_use
= outer
!= NULL
;
5066 local
.byte
= outer
? outer
->byte
: 0;
5068 local
.type
= TREE_TYPE (exp
);
5070 local
.last_relative_index
= -1;
5072 local
.min_index
= NULL_TREE
;
5073 if (TREE_CODE (local
.type
) == ARRAY_TYPE
5074 && TYPE_DOMAIN (local
.type
) != NULL_TREE
)
5075 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5077 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5079 /* As CE goes through the elements of the constant, FIELD goes through the
5080 structure fields if the constant is a structure. If the constant is a
5081 union, we override this by getting the field from the TREE_LIST element.
5082 But the constant could also be an array. Then FIELD is zero.
5084 There is always a maximum of one element in the chain LINK for unions
5085 (even if the initializer in a source program incorrectly contains
5088 local
.field
= NULL_TREE
;
5089 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5090 local
.field
= TYPE_FIELDS (local
.type
);
5093 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5094 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5096 local
.val
= ce
->value
;
5097 local
.index
= NULL_TREE
;
5099 /* The element in a union constructor specifies the proper field
5101 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5102 local
.field
= ce
->index
;
5104 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5105 local
.index
= ce
->index
;
5107 if (local
.field
&& flag_verbose_asm
)
5108 fprintf (asm_out_file
, "%s %s:\n",
5110 DECL_NAME (local
.field
)
5111 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5114 /* Eliminate the marker that makes a cast not be an lvalue. */
5115 if (local
.val
!= NULL_TREE
)
5116 STRIP_NOPS (local
.val
);
5118 /* Output the current element, using the appropriate helper ... */
5120 /* For an array slice not part of an outer bitfield. */
5122 && local
.index
!= NULL_TREE
5123 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5124 output_constructor_array_range (&local
);
5126 /* For a field that is neither a true bitfield nor part of an outer one,
5127 known to be at least byte aligned and multiple-of-bytes long. */
5129 && (local
.field
== NULL_TREE
5130 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5131 output_constructor_regular_field (&local
);
5133 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5134 supported for scalar fields, so we may need to convert first. */
5137 if (TREE_CODE (local
.val
) == REAL_CST
)
5139 = fold_unary (VIEW_CONVERT_EXPR
,
5140 build_nonstandard_integer_type
5141 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5143 output_constructor_bitfield (&local
, outer
);
5147 /* If we are not at toplevel, save the pending data for our caller.
5148 Otherwise output the pending data and padding zeros as needed. */
5150 outer
->byte
= local
.byte
;
5153 if (local
.byte_buffer_in_use
)
5155 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5156 local
.total_bytes
++;
5159 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5161 assemble_zeros (local
.size
- local
.total_bytes
);
5162 local
.total_bytes
= local
.size
;
5166 return local
.total_bytes
;
5169 /* Mark DECL as weak. */
5172 mark_weak (tree decl
)
5174 DECL_WEAK (decl
) = 1;
5176 if (DECL_RTL_SET_P (decl
)
5177 && MEM_P (DECL_RTL (decl
))
5178 && XEXP (DECL_RTL (decl
), 0)
5179 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5180 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5183 /* Merge weak status between NEWDECL and OLDDECL. */
5186 merge_weak (tree newdecl
, tree olddecl
)
5188 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5190 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5193 /* We put the NEWDECL on the weak_decls list at some point
5194 and OLDDECL as well. Keep just OLDDECL on the list. */
5195 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5196 if (TREE_VALUE (*pwd
) == newdecl
)
5198 *pwd
= TREE_CHAIN (*pwd
);
5205 if (DECL_WEAK (newdecl
))
5209 /* NEWDECL is weak, but OLDDECL is not. */
5211 /* If we already output the OLDDECL, we're in trouble; we can't
5212 go back and make it weak. This should never happen in
5213 unit-at-a-time compilation. */
5214 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5216 /* If we've already generated rtl referencing OLDDECL, we may
5217 have done so in a way that will not function properly with
5218 a weak symbol. Again in unit-at-a-time this should be
5220 gcc_assert (!TREE_USED (olddecl
)
5221 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5223 if (TARGET_SUPPORTS_WEAK
)
5225 /* We put the NEWDECL on the weak_decls list at some point.
5226 Replace it with the OLDDECL. */
5227 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5228 if (TREE_VALUE (wd
) == newdecl
)
5230 TREE_VALUE (wd
) = olddecl
;
5233 /* We may not find the entry on the list. If NEWDECL is a
5234 weak alias, then we will have already called
5235 globalize_decl to remove the entry; in that case, we do
5236 not need to do anything. */
5239 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5240 mark_weak (olddecl
);
5243 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5244 weak. Just update NEWDECL to indicate that it's weak too. */
5245 mark_weak (newdecl
);
5248 /* Declare DECL to be a weak symbol. */
5251 declare_weak (tree decl
)
5253 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5254 if (! TREE_PUBLIC (decl
))
5255 error ("weak declaration of %q+D must be public", decl
);
5256 else if (!TARGET_SUPPORTS_WEAK
)
5257 warning (0, "weak declaration of %q+D not supported", decl
);
5260 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5261 DECL_ATTRIBUTES (decl
)
5262 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5266 weak_finish_1 (tree decl
)
5268 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5269 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5272 if (! TREE_USED (decl
))
5275 #ifdef ASM_WEAKEN_DECL
5276 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5278 #ifdef ASM_WEAKEN_LABEL
5279 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5281 #ifdef ASM_OUTPUT_WEAK_ALIAS
5283 static bool warn_once
= 0;
5286 warning (0, "only weak aliases are supported in this configuration");
5296 /* Fiven an assembly name, find the decl it is associated with. */
5298 find_decl (tree target
)
5300 symtab_node node
= symtab_node_for_asm (target
);
5302 return node
->symbol
.decl
;
5306 /* This TREE_LIST contains weakref targets. */
5308 static GTY(()) tree weakref_targets
;
5310 /* Emit any pending weak declarations. */
5317 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5319 tree alias_decl
= TREE_PURPOSE (t
);
5320 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5322 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5323 /* Remove alias_decl from the weak list, but leave entries for
5324 the target alone. */
5326 #ifndef ASM_OUTPUT_WEAKREF
5327 else if (! TREE_SYMBOL_REFERENCED (target
))
5329 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5330 defined, otherwise we and weak_finish_1 would use
5331 different macros. */
5332 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5333 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5335 tree decl
= find_decl (target
);
5339 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5340 TREE_CODE (alias_decl
), target
,
5341 TREE_TYPE (alias_decl
));
5343 DECL_EXTERNAL (decl
) = 1;
5344 TREE_PUBLIC (decl
) = 1;
5345 DECL_ARTIFICIAL (decl
) = 1;
5346 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5347 TREE_USED (decl
) = 1;
5350 weak_finish_1 (decl
);
5359 /* Remove the alias and the target from the pending weak list
5360 so that we do not emit any .weak directives for the former,
5361 nor multiple .weak directives for the latter. */
5362 for (p
= &weak_decls
; (t2
= *p
) ; )
5364 if (TREE_VALUE (t2
) == alias_decl
5365 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5366 *p
= TREE_CHAIN (t2
);
5368 p
= &TREE_CHAIN (t2
);
5371 /* Remove other weakrefs to the same target, to speed things up. */
5372 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5374 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5375 *p
= TREE_CHAIN (t2
);
5377 p
= &TREE_CHAIN (t2
);
5382 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5384 tree decl
= TREE_VALUE (t
);
5386 weak_finish_1 (decl
);
5390 /* Emit the assembly bits to indicate that DECL is globally visible. */
5393 globalize_decl (tree decl
)
5396 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5397 if (DECL_WEAK (decl
))
5399 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5402 #ifdef ASM_WEAKEN_DECL
5403 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5405 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5408 /* Remove this function from the pending weak list so that
5409 we do not emit multiple .weak directives for it. */
5410 for (p
= &weak_decls
; (t
= *p
) ; )
5412 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5413 *p
= TREE_CHAIN (t
);
5415 p
= &TREE_CHAIN (t
);
5418 /* Remove weakrefs to the same target from the pending weakref
5419 list, for the same reason. */
5420 for (p
= &weakref_targets
; (t
= *p
) ; )
5422 if (DECL_ASSEMBLER_NAME (decl
)
5423 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5424 *p
= TREE_CHAIN (t
);
5426 p
= &TREE_CHAIN (t
);
5433 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5436 vec
<alias_pair
, va_gc
> *alias_pairs
;
5438 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5439 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5440 tree node is DECL to have the value of the tree node TARGET. */
5443 do_assemble_alias (tree decl
, tree target
)
5445 /* Emulated TLS had better not get this var. */
5446 gcc_assert(!(!targetm
.have_tls
5447 && TREE_CODE (decl
) == VAR_DECL
5448 && DECL_THREAD_LOCAL_P (decl
)));
5450 if (TREE_ASM_WRITTEN (decl
))
5453 /* We must force creation of DECL_RTL for debug info generation, even though
5454 we don't use it here. */
5455 make_decl_rtl (decl
);
5457 TREE_ASM_WRITTEN (decl
) = 1;
5458 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5460 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5462 ultimate_transparent_alias_target (&target
);
5464 if (!TREE_SYMBOL_REFERENCED (target
))
5465 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5467 #ifdef ASM_OUTPUT_WEAKREF
5468 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5469 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5470 IDENTIFIER_POINTER (target
));
5472 if (!TARGET_SUPPORTS_WEAK
)
5474 error_at (DECL_SOURCE_LOCATION (decl
),
5475 "weakref is not supported in this configuration");
5482 #ifdef ASM_OUTPUT_DEF
5483 /* Make name accessible from other files, if appropriate. */
5485 if (TREE_PUBLIC (decl
))
5487 globalize_decl (decl
);
5488 maybe_assemble_visibility (decl
);
5490 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5492 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE) && HAVE_GNU_INDIRECT_FUNCTION
5493 ASM_OUTPUT_TYPE_DIRECTIVE
5494 (asm_out_file
, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5497 error_at (DECL_SOURCE_LOCATION (decl
),
5498 "ifunc is not supported in this configuration");
5502 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5503 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5505 ASM_OUTPUT_DEF (asm_out_file
,
5506 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5507 IDENTIFIER_POINTER (target
));
5509 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5514 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5515 # ifdef ASM_WEAKEN_DECL
5516 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5518 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5520 /* Remove this function from the pending weak list so that
5521 we do not emit multiple .weak directives for it. */
5522 for (p
= &weak_decls
; (t
= *p
) ; )
5523 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5524 *p
= TREE_CHAIN (t
);
5526 p
= &TREE_CHAIN (t
);
5528 /* Remove weakrefs to the same target from the pending weakref
5529 list, for the same reason. */
5530 for (p
= &weakref_targets
; (t
= *p
) ; )
5532 if (DECL_ASSEMBLER_NAME (decl
)
5533 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5534 *p
= TREE_CHAIN (t
);
5536 p
= &TREE_CHAIN (t
);
5542 /* Emit an assembler directive to make the symbol for DECL an alias to
5543 the symbol for TARGET. */
5546 assemble_alias (tree decl
, tree target
)
5550 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5552 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5554 ultimate_transparent_alias_target (&target
);
5556 if (alias
== target
)
5557 error ("weakref %q+D ultimately targets itself", decl
);
5560 #ifndef ASM_OUTPUT_WEAKREF
5561 IDENTIFIER_TRANSPARENT_ALIAS (alias
) = 1;
5562 TREE_CHAIN (alias
) = target
;
5565 if (TREE_PUBLIC (decl
))
5566 error ("weakref %q+D must have static linkage", decl
);
5570 #if !defined (ASM_OUTPUT_DEF)
5571 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5572 error_at (DECL_SOURCE_LOCATION (decl
),
5573 "alias definitions not supported in this configuration");
5576 if (!DECL_WEAK (decl
))
5578 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5579 error_at (DECL_SOURCE_LOCATION (decl
),
5580 "ifunc is not supported in this configuration");
5582 error_at (DECL_SOURCE_LOCATION (decl
),
5583 "only weak aliases are supported in this configuration");
5589 TREE_USED (decl
) = 1;
5591 /* Allow aliases to aliases. */
5592 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5593 cgraph_get_create_node (decl
)->alias
= true;
5595 varpool_node_for_decl (decl
)->alias
= true;
5597 /* If the target has already been emitted, we don't have to queue the
5598 alias. This saves a tad of memory. */
5599 if (cgraph_global_info_ready
)
5600 target_decl
= find_decl (target
);
5603 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5604 || cgraph_state
>= CGRAPH_STATE_EXPANSION
)
5605 do_assemble_alias (decl
, target
);
5608 alias_pair p
= {decl
, target
};
5609 vec_safe_push (alias_pairs
, p
);
5613 /* Record and output a table of translations from original function
5614 to its transaction aware clone. Note that tm_pure functions are
5615 considered to be their own clone. */
5617 static GTY((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
5618 htab_t tm_clone_hash
;
5621 record_tm_clone_pair (tree o
, tree n
)
5623 struct tree_map
**slot
, *h
;
5625 if (tm_clone_hash
== NULL
)
5626 tm_clone_hash
= htab_create_ggc (32, tree_map_hash
, tree_map_eq
, 0);
5628 h
= ggc_alloc_tree_map ();
5629 h
->hash
= htab_hash_pointer (o
);
5633 slot
= (struct tree_map
**)
5634 htab_find_slot_with_hash (tm_clone_hash
, h
, h
->hash
, INSERT
);
5639 get_tm_clone_pair (tree o
)
5643 struct tree_map
*h
, in
;
5646 in
.hash
= htab_hash_pointer (o
);
5647 h
= (struct tree_map
*) htab_find_with_hash (tm_clone_hash
,
5655 typedef struct tm_alias_pair
5663 /* Helper function for finish_tm_clone_pairs. Dump a hash table entry
5664 into a VEC in INFO. */
5667 dump_tm_clone_to_vec (void **slot
, void *info
)
5669 struct tree_map
*map
= (struct tree_map
*) *slot
;
5670 vec
<tm_alias_pair
> *tm_alias_pairs
= (vec
<tm_alias_pair
> *) info
;
5671 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5672 tm_alias_pairs
->safe_push (p
);
5676 /* Dump the actual pairs to the .tm_clone_table section. */
5679 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5683 bool switched
= false;
5685 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5689 struct cgraph_node
*src_n
= cgraph_get_node (src
);
5690 struct cgraph_node
*dst_n
= cgraph_get_node (dst
);
5692 /* The function ipa_tm_create_version() marks the clone as needed if
5693 the original function was needed. But we also mark the clone as
5694 needed if we ever called the clone indirectly through
5695 TM_GETTMCLONE. If neither of these are true, we didn't generate
5696 a clone, and we didn't call it indirectly... no sense keeping it
5697 in the clone table. */
5698 if (!dst_n
|| !dst_n
->analyzed
)
5701 /* This covers the case where we have optimized the original
5702 function away, and only access the transactional clone. */
5703 if (!src_n
|| !src_n
->analyzed
)
5708 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5709 assemble_align (POINTER_SIZE
);
5713 assemble_integer (XEXP (DECL_RTL (src
), 0),
5714 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5715 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5716 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5720 /* Provide a default for the tm_clone_table section. */
5723 default_clone_table_section (void)
5725 return get_named_section (NULL
, ".tm_clone_table", 3);
5728 /* Helper comparison function for qsorting by the DECL_UID stored in
5729 alias_pair->emitted_diags. */
5732 tm_alias_pair_cmp (const void *x
, const void *y
)
5734 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5735 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5736 if (p1
->uid
< p2
->uid
)
5738 if (p1
->uid
> p2
->uid
)
5744 finish_tm_clone_pairs (void)
5746 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5748 if (tm_clone_hash
== NULL
)
5751 /* We need a determenistic order for the .tm_clone_table, otherwise
5752 we will get bootstrap comparison failures, so dump the hash table
5753 to a vector, sort it, and dump the vector. */
5755 /* Dump the hashtable to a vector. */
5756 htab_traverse_noresize (tm_clone_hash
, dump_tm_clone_to_vec
,
5757 (void *) &tm_alias_pairs
);
5759 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5762 dump_tm_clone_pairs (tm_alias_pairs
);
5764 htab_delete (tm_clone_hash
);
5765 tm_clone_hash
= NULL
;
5766 tm_alias_pairs
.release ();
5770 /* Emit an assembler directive to set symbol for DECL visibility to
5771 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5774 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5775 int vis ATTRIBUTE_UNUSED
)
5777 #ifdef HAVE_GAS_HIDDEN
5778 static const char * const visibility_types
[] = {
5779 NULL
, "protected", "hidden", "internal"
5782 const char *name
, *type
;
5784 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5785 type
= visibility_types
[vis
];
5787 fprintf (asm_out_file
, "\t.%s\t", type
);
5788 assemble_name (asm_out_file
, name
);
5789 fprintf (asm_out_file
, "\n");
5791 warning (OPT_Wattributes
, "visibility attribute not supported "
5792 "in this configuration; ignored");
5796 /* A helper function to call assemble_visibility when needed for a decl. */
5799 maybe_assemble_visibility (tree decl
)
5801 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5803 if (vis
!= VISIBILITY_DEFAULT
)
5805 targetm
.asm_out
.assemble_visibility (decl
, vis
);
5812 /* Returns 1 if the target configuration supports defining public symbols
5813 so that one of them will be chosen at link time instead of generating a
5814 multiply-defined symbol error, whether through the use of weak symbols or
5815 a target-specific mechanism for having duplicates discarded. */
5818 supports_one_only (void)
5820 if (SUPPORTS_ONE_ONLY
)
5822 return TARGET_SUPPORTS_WEAK
;
5825 /* Set up DECL as a public symbol that can be defined in multiple
5826 translation units without generating a linker error. */
5829 make_decl_one_only (tree decl
, tree comdat_group
)
5831 gcc_assert (TREE_CODE (decl
) == VAR_DECL
5832 || TREE_CODE (decl
) == FUNCTION_DECL
);
5834 TREE_PUBLIC (decl
) = 1;
5836 if (SUPPORTS_ONE_ONLY
)
5838 #ifdef MAKE_DECL_ONE_ONLY
5839 MAKE_DECL_ONE_ONLY (decl
);
5841 DECL_COMDAT_GROUP (decl
) = comdat_group
;
5843 else if (TREE_CODE (decl
) == VAR_DECL
5844 && (DECL_INITIAL (decl
) == 0 || DECL_INITIAL (decl
) == error_mark_node
))
5845 DECL_COMMON (decl
) = 1;
5848 gcc_assert (TARGET_SUPPORTS_WEAK
);
5849 DECL_WEAK (decl
) = 1;
5854 init_varasm_once (void)
5856 section_htab
= htab_create_ggc (31, section_entry_hash
,
5857 section_entry_eq
, NULL
);
5858 object_block_htab
= htab_create_ggc (31, object_block_entry_hash
,
5859 object_block_entry_eq
, NULL
);
5860 const_desc_htab
= htab_create_ggc (1009, const_desc_hash
,
5861 const_desc_eq
, NULL
);
5863 const_alias_set
= new_alias_set ();
5864 shared_constant_pool
= create_constant_pool ();
5866 #ifdef TEXT_SECTION_ASM_OP
5867 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
5868 TEXT_SECTION_ASM_OP
);
5871 #ifdef DATA_SECTION_ASM_OP
5872 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5873 DATA_SECTION_ASM_OP
);
5876 #ifdef SDATA_SECTION_ASM_OP
5877 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5878 SDATA_SECTION_ASM_OP
);
5881 #ifdef READONLY_DATA_SECTION_ASM_OP
5882 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
5883 READONLY_DATA_SECTION_ASM_OP
);
5886 #ifdef CTORS_SECTION_ASM_OP
5887 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
5888 CTORS_SECTION_ASM_OP
);
5891 #ifdef DTORS_SECTION_ASM_OP
5892 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
5893 DTORS_SECTION_ASM_OP
);
5896 #ifdef BSS_SECTION_ASM_OP
5897 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5898 output_section_asm_op
,
5899 BSS_SECTION_ASM_OP
);
5902 #ifdef SBSS_SECTION_ASM_OP
5903 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5904 output_section_asm_op
,
5905 SBSS_SECTION_ASM_OP
);
5908 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5909 | SECTION_COMMON
, emit_tls_common
);
5910 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5911 | SECTION_COMMON
, emit_local
);
5912 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5913 | SECTION_COMMON
, emit_common
);
5915 #if defined ASM_OUTPUT_ALIGNED_BSS
5916 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
5920 targetm
.asm_out
.init_sections ();
5922 if (readonly_data_section
== NULL
)
5923 readonly_data_section
= text_section
;
5925 #ifdef ASM_OUTPUT_EXTERNAL
5926 pending_assemble_externals_set
= pointer_set_create ();
5931 decl_default_tls_model (const_tree decl
)
5933 enum tls_model kind
;
5936 is_local
= targetm
.binds_local_p (decl
);
5940 kind
= TLS_MODEL_LOCAL_EXEC
;
5942 kind
= TLS_MODEL_INITIAL_EXEC
;
5945 /* Local dynamic is inefficient when we're not combining the
5946 parts of the address. */
5947 else if (optimize
&& is_local
)
5948 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
5950 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
5951 if (kind
< flag_tls_default
)
5952 kind
= flag_tls_default
;
5957 /* Select a set of attributes for section NAME based on the properties
5958 of DECL and whether or not RELOC indicates that DECL's initializer
5959 might contain runtime relocations.
5961 We make the section read-only and executable for a function decl,
5962 read-only for a const data decl, and writable for a non-const data decl. */
5965 default_section_type_flags (tree decl
, const char *name
, int reloc
)
5969 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
5970 flags
= SECTION_CODE
;
5973 enum section_category category
5974 = categorize_decl_for_section (decl
, reloc
);
5975 if (decl_readonly_section_1 (category
))
5977 else if (category
== SECCAT_DATA_REL_RO
5978 || category
== SECCAT_DATA_REL_RO_LOCAL
)
5979 flags
= SECTION_WRITE
| SECTION_RELRO
;
5981 flags
= SECTION_WRITE
;
5985 flags
= SECTION_WRITE
;
5986 if (strcmp (name
, ".data.rel.ro") == 0
5987 || strcmp (name
, ".data.rel.ro.local") == 0)
5988 flags
|= SECTION_RELRO
;
5991 if (decl
&& DECL_ONE_ONLY (decl
))
5992 flags
|= SECTION_LINKONCE
;
5994 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
5995 flags
|= SECTION_TLS
| SECTION_WRITE
;
5997 if (strcmp (name
, ".bss") == 0
5998 || strncmp (name
, ".bss.", 5) == 0
5999 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6000 || strcmp (name
, ".sbss") == 0
6001 || strncmp (name
, ".sbss.", 6) == 0
6002 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6003 flags
|= SECTION_BSS
;
6005 if (strcmp (name
, ".tdata") == 0
6006 || strncmp (name
, ".tdata.", 7) == 0
6007 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6008 flags
|= SECTION_TLS
;
6010 if (strcmp (name
, ".tbss") == 0
6011 || strncmp (name
, ".tbss.", 6) == 0
6012 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6013 flags
|= SECTION_TLS
| SECTION_BSS
;
6015 /* These three sections have special ELF types. They are neither
6016 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6017 want to print a section type (@progbits or @nobits). If someone
6018 is silly enough to emit code or TLS variables to one of these
6019 sections, then don't handle them specially. */
6020 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6021 && (strcmp (name
, ".init_array") == 0
6022 || strcmp (name
, ".fini_array") == 0
6023 || strcmp (name
, ".preinit_array") == 0))
6024 flags
|= SECTION_NOTYPE
;
6029 /* Return true if the target supports some form of global BSS,
6030 either through bss_noswitch_section, or by selecting a BSS
6031 section in TARGET_ASM_SELECT_SECTION. */
6034 have_global_bss_p (void)
6036 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6039 /* Output assembly to switch to section NAME with attribute FLAGS.
6040 Four variants for common object file formats. */
6043 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6044 unsigned int flags ATTRIBUTE_UNUSED
,
6045 tree decl ATTRIBUTE_UNUSED
)
6047 /* Some object formats don't support named sections at all. The
6048 front-end should already have flagged this as an error. */
6052 #ifndef TLS_SECTION_ASM_FLAG
6053 #define TLS_SECTION_ASM_FLAG 'T'
6057 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6058 tree decl ATTRIBUTE_UNUSED
)
6060 char flagchars
[10], *f
= flagchars
;
6062 /* If we have already declared this section, we can use an
6063 abbreviated form to switch back to it -- unless this section is
6064 part of a COMDAT groups, in which case GAS requires the full
6065 declaration every time. */
6066 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6067 && (flags
& SECTION_DECLARED
))
6069 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6073 if (!(flags
& SECTION_DEBUG
))
6075 if (flags
& SECTION_EXCLUDE
)
6077 if (flags
& SECTION_WRITE
)
6079 if (flags
& SECTION_CODE
)
6081 if (flags
& SECTION_SMALL
)
6083 if (flags
& SECTION_MERGE
)
6085 if (flags
& SECTION_STRINGS
)
6087 if (flags
& SECTION_TLS
)
6088 *f
++ = TLS_SECTION_ASM_FLAG
;
6089 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6093 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6095 if (!(flags
& SECTION_NOTYPE
))
6100 if (flags
& SECTION_BSS
)
6106 /* On platforms that use "@" as the assembly comment character,
6108 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6110 fprintf (asm_out_file
, format
, type
);
6112 if (flags
& SECTION_ENTSIZE
)
6113 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6114 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6116 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6117 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6119 fprintf (asm_out_file
, ",%s,comdat",
6120 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6124 putc ('\n', asm_out_file
);
6128 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6129 tree decl ATTRIBUTE_UNUSED
)
6131 char flagchars
[8], *f
= flagchars
;
6133 if (flags
& SECTION_WRITE
)
6135 if (flags
& SECTION_CODE
)
6139 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6143 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6146 default_coff_asm_named_section (name
, flags
, decl
);
6148 if (flags
& SECTION_LINKONCE
)
6150 /* Functions may have been compiled at various levels of
6151 optimization so we can't use `same_size' here.
6152 Instead, have the linker pick one. */
6153 fprintf (asm_out_file
, "\t.linkonce %s\n",
6154 (flags
& SECTION_CODE
? "discard" : "same_size"));
6158 /* The lame default section selector. */
6161 default_select_section (tree decl
, int reloc
,
6162 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6166 if (decl_readonly_section (decl
, reloc
))
6167 return readonly_data_section
;
6169 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6171 if (! ((flag_pic
&& reloc
)
6172 || !TREE_READONLY (decl
)
6173 || TREE_SIDE_EFFECTS (decl
)
6174 || !TREE_CONSTANT (decl
)))
6175 return readonly_data_section
;
6177 else if (TREE_CODE (decl
) == STRING_CST
)
6178 return readonly_data_section
;
6179 else if (! (flag_pic
&& reloc
))
6180 return readonly_data_section
;
6182 return data_section
;
6185 enum section_category
6186 categorize_decl_for_section (const_tree decl
, int reloc
)
6188 enum section_category ret
;
6190 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6192 else if (TREE_CODE (decl
) == STRING_CST
)
6195 || (flag_asan
&& asan_protect_global (CONST_CAST_TREE (decl
))))
6196 /* or !flag_merge_constants */
6197 return SECCAT_RODATA
;
6199 return SECCAT_RODATA_MERGE_STR
;
6201 else if (TREE_CODE (decl
) == VAR_DECL
)
6203 if (bss_initializer_p (decl
))
6205 else if (! TREE_READONLY (decl
)
6206 || TREE_SIDE_EFFECTS (decl
)
6207 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6209 /* Here the reloc_rw_mask is not testing whether the section should
6210 be read-only or not, but whether the dynamic link will have to
6211 do something. If so, we wish to segregate the data in order to
6212 minimize cache misses inside the dynamic linker. */
6213 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6214 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6218 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6219 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6220 else if (reloc
|| flag_merge_constants
< 2 || flag_mudflap
6221 || (flag_asan
&& asan_protect_global (CONST_CAST_TREE (decl
))))
6222 /* C and C++ don't allow different variables to share the same
6223 location. -fmerge-all-constants allows even that (at the
6224 expense of not conforming). */
6225 ret
= SECCAT_RODATA
;
6226 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6227 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6229 ret
= SECCAT_RODATA_MERGE_CONST
;
6231 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6233 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6234 || TREE_SIDE_EFFECTS (decl
)
6235 || ! TREE_CONSTANT (decl
))
6238 ret
= SECCAT_RODATA
;
6241 ret
= SECCAT_RODATA
;
6243 /* There are no read-only thread-local sections. */
6244 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6246 /* Note that this would be *just* SECCAT_BSS, except that there's
6247 no concept of a read-only thread-local-data section. */
6248 if (ret
== SECCAT_BSS
6249 || (flag_zero_initialized_in_bss
6250 && initializer_zerop (DECL_INITIAL (decl
))))
6256 /* If the target uses small data sections, select it. */
6257 else if (targetm
.in_small_data_p (decl
))
6259 if (ret
== SECCAT_BSS
)
6261 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6262 ret
= SECCAT_SRODATA
;
6271 decl_readonly_section_1 (enum section_category category
)
6276 case SECCAT_RODATA_MERGE_STR
:
6277 case SECCAT_RODATA_MERGE_STR_INIT
:
6278 case SECCAT_RODATA_MERGE_CONST
:
6279 case SECCAT_SRODATA
:
6287 decl_readonly_section (const_tree decl
, int reloc
)
6289 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6292 /* Select a section based on the above categorization. */
6295 default_elf_select_section (tree decl
, int reloc
,
6296 unsigned HOST_WIDE_INT align
)
6299 switch (categorize_decl_for_section (decl
, reloc
))
6302 /* We're not supposed to be called on FUNCTION_DECLs. */
6305 return readonly_data_section
;
6306 case SECCAT_RODATA_MERGE_STR
:
6307 return mergeable_string_section (decl
, align
, 0);
6308 case SECCAT_RODATA_MERGE_STR_INIT
:
6309 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6310 case SECCAT_RODATA_MERGE_CONST
:
6311 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6312 case SECCAT_SRODATA
:
6316 return data_section
;
6317 case SECCAT_DATA_REL
:
6318 sname
= ".data.rel";
6320 case SECCAT_DATA_REL_LOCAL
:
6321 sname
= ".data.rel.local";
6323 case SECCAT_DATA_REL_RO
:
6324 sname
= ".data.rel.ro";
6326 case SECCAT_DATA_REL_RO_LOCAL
:
6327 sname
= ".data.rel.ro.local";
6352 return get_named_section (decl
, sname
, reloc
);
6355 /* Construct a unique section name based on the decl name and the
6356 categorization performed above. */
6359 default_unique_section (tree decl
, int reloc
)
6361 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6362 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6363 const char *prefix
, *name
, *linkonce
;
6366 switch (categorize_decl_for_section (decl
, reloc
))
6369 prefix
= one_only
? ".t" : ".text";
6372 case SECCAT_RODATA_MERGE_STR
:
6373 case SECCAT_RODATA_MERGE_STR_INIT
:
6374 case SECCAT_RODATA_MERGE_CONST
:
6375 prefix
= one_only
? ".r" : ".rodata";
6377 case SECCAT_SRODATA
:
6378 prefix
= one_only
? ".s2" : ".sdata2";
6381 prefix
= one_only
? ".d" : ".data";
6383 case SECCAT_DATA_REL
:
6384 prefix
= one_only
? ".d.rel" : ".data.rel";
6386 case SECCAT_DATA_REL_LOCAL
:
6387 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6389 case SECCAT_DATA_REL_RO
:
6390 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6392 case SECCAT_DATA_REL_RO_LOCAL
:
6393 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6396 prefix
= one_only
? ".s" : ".sdata";
6399 prefix
= one_only
? ".b" : ".bss";
6402 prefix
= one_only
? ".sb" : ".sbss";
6405 prefix
= one_only
? ".td" : ".tdata";
6408 prefix
= one_only
? ".tb" : ".tbss";
6414 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
6415 name
= targetm
.strip_name_encoding (name
);
6417 /* If we're using one_only, then there needs to be a .gnu.linkonce
6418 prefix to the section name. */
6419 linkonce
= one_only
? ".gnu.linkonce" : "";
6421 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6423 DECL_SECTION_NAME (decl
) = build_string (strlen (string
), string
);
6426 /* Like compute_reloc_for_constant, except for an RTX. The return value
6427 is a mask for which bit 1 indicates a global relocation, and bit 0
6428 indicates a local relocation. */
6431 compute_reloc_for_rtx_1 (rtx
*xp
, void *data
)
6433 int *preloc
= (int *) data
;
6436 switch (GET_CODE (x
))
6439 *preloc
|= SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6452 compute_reloc_for_rtx (rtx x
)
6456 switch (GET_CODE (x
))
6462 for_each_rtx (&x
, compute_reloc_for_rtx_1
, &reloc
);
6471 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
6473 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6475 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6476 return data_section
;
6478 return readonly_data_section
;
6482 default_elf_select_rtx_section (enum machine_mode mode
, rtx x
,
6483 unsigned HOST_WIDE_INT align
)
6485 int reloc
= compute_reloc_for_rtx (x
);
6487 /* ??? Handle small data here somehow. */
6489 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6492 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6494 return get_named_section (NULL
, ".data.rel.ro", 3);
6497 return mergeable_constant_section (mode
, align
, 0);
6500 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6503 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6508 /* Careful not to prod global register variables. */
6511 symbol
= XEXP (rtl
, 0);
6512 if (GET_CODE (symbol
) != SYMBOL_REF
)
6515 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6516 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6517 flags
|= SYMBOL_FLAG_FUNCTION
;
6518 if (targetm
.binds_local_p (decl
))
6519 flags
|= SYMBOL_FLAG_LOCAL
;
6520 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6521 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6522 else if (targetm
.in_small_data_p (decl
))
6523 flags
|= SYMBOL_FLAG_SMALL
;
6524 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6525 being PUBLIC, the thing *must* be defined in this translation unit.
6526 Prevent this buglet from being propagated into rtl code as well. */
6527 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6528 flags
|= SYMBOL_FLAG_EXTERNAL
;
6530 SYMBOL_REF_FLAGS (symbol
) = flags
;
6533 /* By default, we do nothing for encode_section_info, so we need not
6534 do anything but discard the '*' marker. */
6537 default_strip_name_encoding (const char *str
)
6539 return str
+ (*str
== '*');
6542 #ifdef ASM_OUTPUT_DEF
6543 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6544 anchor relative to ".", the current section position. */
6547 default_asm_output_anchor (rtx symbol
)
6551 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6552 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6553 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6557 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6560 default_use_anchors_for_symbol_p (const_rtx symbol
)
6565 /* Don't use anchors for mergeable sections. The linker might move
6566 the objects around. */
6567 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6568 if (sect
->common
.flags
& SECTION_MERGE
)
6571 /* Don't use anchors for small data sections. The small data register
6572 acts as an anchor for such sections. */
6573 if (sect
->common
.flags
& SECTION_SMALL
)
6576 decl
= SYMBOL_REF_DECL (symbol
);
6577 if (decl
&& DECL_P (decl
))
6579 /* Don't use section anchors for decls that might be defined by
6581 if (!targetm
.binds_local_p (decl
))
6584 /* Don't use section anchors for decls that will be placed in a
6585 small data section. */
6586 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6587 one above. The problem is that we only use SECTION_SMALL for
6588 sections that should be marked as small in the section directive. */
6589 if (targetm
.in_small_data_p (decl
))
6595 /* Return true when RESOLUTION indicate that symbol will be bound to the
6596 definition provided by current .o file. */
6599 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6601 return (resolution
== LDPR_PREVAILING_DEF
6602 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6603 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6606 /* Return true when RESOLUTION indicate that symbol will be bound locally
6607 within current executable or DSO. */
6610 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6612 return (resolution
== LDPR_PREVAILING_DEF
6613 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6614 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6615 || resolution
== LDPR_PREEMPTED_REG
6616 || resolution
== LDPR_PREEMPTED_IR
6617 || resolution
== LDPR_RESOLVED_IR
6618 || resolution
== LDPR_RESOLVED_EXEC
);
6621 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6622 wrt cross-module name binding. */
6625 default_binds_local_p (const_tree exp
)
6627 return default_binds_local_p_1 (exp
, flag_shlib
);
6631 default_binds_local_p_1 (const_tree exp
, int shlib
)
6634 bool resolved_locally
= false;
6635 bool resolved_to_local_def
= false;
6637 /* With resolution file in hands, take look into resolutions.
6638 We can't just return true for resolved_locally symbols,
6639 because dynamic linking might overwrite symbols
6640 in shared libraries. */
6641 if (TREE_CODE (exp
) == VAR_DECL
&& TREE_PUBLIC (exp
)
6642 && (TREE_STATIC (exp
) || DECL_EXTERNAL (exp
)))
6644 struct varpool_node
*vnode
= varpool_get_node (exp
);
6645 if (vnode
&& resolution_local_p (vnode
->symbol
.resolution
))
6646 resolved_locally
= true;
6648 && resolution_to_local_definition_p (vnode
->symbol
.resolution
))
6649 resolved_to_local_def
= true;
6651 else if (TREE_CODE (exp
) == FUNCTION_DECL
&& TREE_PUBLIC (exp
))
6653 struct cgraph_node
*node
= cgraph_get_node (exp
);
6655 && resolution_local_p (node
->symbol
.resolution
))
6656 resolved_locally
= true;
6658 && resolution_to_local_definition_p (node
->symbol
.resolution
))
6659 resolved_to_local_def
= true;
6662 /* A non-decl is an entry in the constant pool. */
6665 /* Weakrefs may not bind locally, even though the weakref itself is always
6666 static and therefore local. Similarly, the resolver for ifunc functions
6667 might resolve to a non-local function.
6668 FIXME: We can resolve the weakref case more curefuly by looking at the
6670 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6671 || (TREE_CODE (exp
) == FUNCTION_DECL
6672 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6674 /* Static variables are always local. */
6675 else if (! TREE_PUBLIC (exp
))
6677 /* A variable is local if the user has said explicitly that it will
6679 else if ((DECL_VISIBILITY_SPECIFIED (exp
)
6680 || resolved_to_local_def
)
6681 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6683 /* Variables defined outside this object might not be local. */
6684 else if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6686 /* If defined in this object and visibility is not default, must be
6688 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6690 /* Default visibility weak data can be overridden by a strong symbol
6691 in another module and so are not local. */
6692 else if (DECL_WEAK (exp
)
6693 && !resolved_locally
)
6695 /* If PIC, then assume that any global name can be overridden by
6696 symbols resolved from other modules. */
6699 /* Uninitialized COMMON variable may be unified with symbols
6700 resolved from other modules. */
6701 else if (DECL_COMMON (exp
)
6702 && !resolved_locally
6703 && (DECL_INITIAL (exp
) == NULL
6704 || DECL_INITIAL (exp
) == error_mark_node
))
6706 /* Otherwise we're left with initialized (or non-common) global data
6707 which is of necessity defined locally. */
6714 /* Return true when references to DECL must bind to current definition in
6717 The condition is usually equivalent to whether the function binds to the
6718 current module (shared library or executable), that is to binds_local_p.
6719 We use this fact to avoid need for another target hook and implement
6720 the logic using binds_local_p and just special cases where
6721 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6722 the weak definitions (that can be overwritten at linktime by other
6723 definition from different object file) and when resolution info is available
6724 we simply use the knowledge passed to us by linker plugin. */
6726 decl_binds_to_current_def_p (tree decl
)
6728 gcc_assert (DECL_P (decl
));
6729 if (!TREE_PUBLIC (decl
))
6731 if (!targetm
.binds_local_p (decl
))
6733 /* When resolution is available, just use it. */
6734 if (TREE_CODE (decl
) == VAR_DECL
6735 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)))
6737 struct varpool_node
*vnode
= varpool_get_node (decl
);
6739 && vnode
->symbol
.resolution
!= LDPR_UNKNOWN
)
6740 return resolution_to_local_definition_p (vnode
->symbol
.resolution
);
6742 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
6744 struct cgraph_node
*node
= cgraph_get_node (decl
);
6746 && node
->symbol
.resolution
!= LDPR_UNKNOWN
)
6747 return resolution_to_local_definition_p (node
->symbol
.resolution
);
6749 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6750 binds locally but still can be overwritten).
6751 This rely on fact that binds_local_p behave as decl_replaceable_p
6752 for all other declaration types. */
6753 return !DECL_WEAK (decl
);
6756 /* A replaceable function or variable is one which may be replaced
6757 at link-time with an entirely different definition, provided that the
6758 replacement has the same type. For example, functions declared
6759 with __attribute__((weak)) on most systems are replaceable.
6761 COMDAT functions are not replaceable, since all definitions of the
6762 function must be equivalent. It is important that COMDAT functions
6763 not be treated as replaceable so that use of C++ template
6764 instantiations is not penalized. */
6767 decl_replaceable_p (tree decl
)
6769 gcc_assert (DECL_P (decl
));
6770 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
6772 return !decl_binds_to_current_def_p (decl
);
6775 /* Default function to output code that will globalize a label. A
6776 target must define GLOBAL_ASM_OP or provide its own function to
6777 globalize a label. */
6778 #ifdef GLOBAL_ASM_OP
6780 default_globalize_label (FILE * stream
, const char *name
)
6782 fputs (GLOBAL_ASM_OP
, stream
);
6783 assemble_name (stream
, name
);
6784 putc ('\n', stream
);
6786 #endif /* GLOBAL_ASM_OP */
6788 /* Default function to output code that will globalize a declaration. */
6790 default_globalize_decl_name (FILE * stream
, tree decl
)
6792 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6793 targetm
.asm_out
.globalize_label (stream
, name
);
6796 /* Default function to output a label for unwind information. The
6797 default is to do nothing. A target that needs nonlocal labels for
6798 unwind information must provide its own function to do this. */
6800 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6801 tree decl ATTRIBUTE_UNUSED
,
6802 int for_eh ATTRIBUTE_UNUSED
,
6803 int empty ATTRIBUTE_UNUSED
)
6807 /* Default function to output a label to divide up the exception table.
6808 The default is to do nothing. A target that needs/wants to divide
6809 up the table must provide it's own function to do this. */
6811 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
6815 /* This is how to output an internal numbered label where PREFIX is
6816 the class of label and LABELNO is the number within the class. */
6819 default_generate_internal_label (char *buf
, const char *prefix
,
6820 unsigned long labelno
)
6822 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6825 /* This is how to output an internal numbered label where PREFIX is
6826 the class of label and LABELNO is the number within the class. */
6829 default_internal_label (FILE *stream
, const char *prefix
,
6830 unsigned long labelno
)
6832 char *const buf
= (char *) alloca (40 + strlen (prefix
));
6833 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6834 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
6838 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
6841 default_asm_declare_constant_name (FILE *file
, const char *name
,
6842 const_tree exp ATTRIBUTE_UNUSED
,
6843 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
6845 assemble_label (file
, name
);
6848 /* This is the default behavior at the beginning of a file. It's
6849 controlled by two other target-hook toggles. */
6851 default_file_start (void)
6853 if (targetm
.asm_file_start_app_off
6854 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
6855 fputs (ASM_APP_OFF
, asm_out_file
);
6857 if (targetm
.asm_file_start_file_directive
)
6858 output_file_directive (asm_out_file
, main_input_filename
);
6861 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6862 which emits a special section directive used to indicate whether or
6863 not this object file needs an executable stack. This is primarily
6864 a GNU extension to ELF but could be used on other targets. */
6866 int trampolines_created
;
6869 file_end_indicate_exec_stack (void)
6871 unsigned int flags
= SECTION_DEBUG
;
6872 if (trampolines_created
)
6873 flags
|= SECTION_CODE
;
6875 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
6878 /* Emit a special section directive to indicate that this object file
6879 was compiled with -fsplit-stack. This is used to let the linker
6880 detect calls between split-stack code and non-split-stack code, so
6881 that it can modify the split-stack code to allocate a sufficiently
6882 large stack. We emit another special section if there are any
6883 functions in this file which have the no_split_stack attribute, to
6884 prevent the linker from warning about being unable to convert the
6885 functions if they call non-split-stack code. */
6888 file_end_indicate_split_stack (void)
6890 if (flag_split_stack
)
6892 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
6894 if (saw_no_split_stack
)
6895 switch_to_section (get_section (".note.GNU-no-split-stack",
6896 SECTION_DEBUG
, NULL
));
6900 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6901 a get_unnamed_section callback. */
6904 output_section_asm_op (const void *directive
)
6906 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
6909 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6910 the current section is NEW_SECTION. */
6913 switch_to_section (section
*new_section
)
6915 if (in_section
== new_section
)
6918 if (new_section
->common
.flags
& SECTION_FORGET
)
6921 in_section
= new_section
;
6923 switch (SECTION_STYLE (new_section
))
6926 targetm
.asm_out
.named_section (new_section
->named
.name
,
6927 new_section
->named
.common
.flags
,
6928 new_section
->named
.decl
);
6931 case SECTION_UNNAMED
:
6932 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
6935 case SECTION_NOSWITCH
:
6940 new_section
->common
.flags
|= SECTION_DECLARED
;
6943 /* If block symbol SYMBOL has not yet been assigned an offset, place
6944 it at the end of its block. */
6947 place_block_symbol (rtx symbol
)
6949 unsigned HOST_WIDE_INT size
, mask
, offset
;
6950 struct constant_descriptor_rtx
*desc
;
6951 unsigned int alignment
;
6952 struct object_block
*block
;
6955 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
6956 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
6959 /* Work out the symbol's size and alignment. */
6960 if (CONSTANT_POOL_ADDRESS_P (symbol
))
6962 desc
= SYMBOL_REF_CONSTANT (symbol
);
6963 alignment
= desc
->align
;
6964 size
= GET_MODE_SIZE (desc
->mode
);
6966 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
6968 decl
= SYMBOL_REF_DECL (symbol
);
6969 alignment
= DECL_ALIGN (decl
);
6970 size
= get_constant_size (DECL_INITIAL (decl
));
6972 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
6973 && asan_protect_global (DECL_INITIAL (decl
)))
6974 size
+= asan_red_zone_size (size
);
6978 decl
= SYMBOL_REF_DECL (symbol
);
6979 alignment
= DECL_ALIGN (decl
);
6980 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
6981 if (flag_asan
&& asan_protect_global (decl
))
6983 size
+= asan_red_zone_size (size
);
6984 alignment
= MAX (alignment
,
6985 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
6989 /* Calculate the object's offset from the start of the block. */
6990 block
= SYMBOL_REF_BLOCK (symbol
);
6991 mask
= alignment
/ BITS_PER_UNIT
- 1;
6992 offset
= (block
->size
+ mask
) & ~mask
;
6993 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
6995 /* Record the block's new alignment and size. */
6996 block
->alignment
= MAX (block
->alignment
, alignment
);
6997 block
->size
= offset
+ size
;
6999 vec_safe_push (block
->objects
, symbol
);
7002 /* Return the anchor that should be used to address byte offset OFFSET
7003 from the first object in BLOCK. MODEL is the TLS model used
7007 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7008 enum tls_model model
)
7011 unsigned int begin
, middle
, end
;
7012 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7015 /* Work out the anchor's offset. Use an offset of 0 for the first
7016 anchor so that we don't pessimize the case where we take the address
7017 of a variable at the beginning of the block. This is particularly
7018 useful when a block has only one variable assigned to it.
7020 We try to place anchors RANGE bytes apart, so there can then be
7021 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7022 a ptr_mode offset. With some target settings, the lowest such
7023 anchor might be out of range for the lowest ptr_mode offset;
7024 likewise the highest anchor for the highest offset. Use anchors
7025 at the extreme ends of the ptr_mode range in such cases.
7027 All arithmetic uses unsigned integers in order to avoid
7029 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7030 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7031 range
= max_offset
- min_offset
+ 1;
7036 bias
= 1 << (GET_MODE_BITSIZE (ptr_mode
) - 1);
7039 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7040 delta
-= delta
% range
;
7043 offset
= (HOST_WIDE_INT
) (-delta
);
7047 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7048 delta
-= delta
% range
;
7049 if (delta
> bias
- 1)
7051 offset
= (HOST_WIDE_INT
) delta
;
7055 /* Do a binary search to see if there's already an anchor we can use.
7056 Set BEGIN to the new anchor's index if not. */
7058 end
= vec_safe_length (block
->anchors
);
7059 while (begin
!= end
)
7061 middle
= (end
+ begin
) / 2;
7062 anchor
= (*block
->anchors
)[middle
];
7063 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7065 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7067 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7069 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7075 /* Create a new anchor with a unique label. */
7076 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7077 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7078 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7079 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7081 /* Insert it at index BEGIN. */
7082 vec_safe_insert (block
->anchors
, begin
, anchor
);
7086 /* Output the objects in BLOCK. */
7089 output_object_block (struct object_block
*block
)
7091 struct constant_descriptor_rtx
*desc
;
7093 HOST_WIDE_INT offset
;
7097 if (!block
->objects
)
7100 /* Switch to the section and make sure that the first byte is
7101 suitably aligned. */
7102 switch_to_section (block
->sect
);
7103 assemble_align (block
->alignment
);
7105 /* Define the values of all anchors relative to the current section
7107 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7108 targetm
.asm_out
.output_anchor (symbol
);
7110 /* Output the objects themselves. */
7112 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7114 /* Move to the object's offset, padding with zeros if necessary. */
7115 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7116 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7117 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7119 desc
= SYMBOL_REF_CONSTANT (symbol
);
7120 output_constant_pool_1 (desc
, 1);
7121 offset
+= GET_MODE_SIZE (desc
->mode
);
7123 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7126 decl
= SYMBOL_REF_DECL (symbol
);
7127 assemble_constant_contents (DECL_INITIAL (decl
), XSTR (symbol
, 0),
7129 size
= get_constant_size (DECL_INITIAL (decl
));
7132 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7133 && asan_protect_global (DECL_INITIAL (decl
)))
7135 size
= asan_red_zone_size (size
);
7136 assemble_zeros (size
);
7143 decl
= SYMBOL_REF_DECL (symbol
);
7144 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7145 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
7147 if (flag_asan
&& asan_protect_global (decl
))
7149 size
= asan_red_zone_size (size
);
7150 assemble_zeros (size
);
7157 /* A htab_traverse callback used to call output_object_block for
7158 each member of object_block_htab. */
7161 output_object_block_htab (void **slot
, void *data ATTRIBUTE_UNUSED
)
7163 output_object_block ((struct object_block
*) (*slot
));
7167 /* Output the definitions of all object_blocks. */
7170 output_object_blocks (void)
7172 htab_traverse (object_block_htab
, output_object_block_htab
, NULL
);
7175 /* This function provides a possible implementation of the
7176 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7177 by -frecord-gcc-switches it creates a new mergeable, string section in the
7178 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7179 contains the switches in ASCII format.
7181 FIXME: This code does not correctly handle double quote characters
7182 that appear inside strings, (it strips them rather than preserving them).
7183 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7184 characters - instead it treats them as sub-string separators. Since
7185 we want to emit NUL strings terminators into the object file we have to use
7189 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7193 case SWITCH_TYPE_PASSED
:
7194 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7195 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7198 case SWITCH_TYPE_DESCRIPTIVE
:
7201 /* Distinguish between invocations where name is NULL. */
7202 static bool started
= false;
7208 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7212 | (SECTION_ENTSIZE
& 1),
7214 switch_to_section (sec
);
7223 /* The return value is currently ignored by the caller, but must be 0.
7224 For -fverbose-asm the return value would be the number of characters
7225 emitted into the assembler file. */
7229 /* Emit text to declare externally defined symbols. It is needed to
7230 properly support non-default visibility. */
7232 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7234 const char *name ATTRIBUTE_UNUSED
)
7236 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7237 set in order to avoid putting out names that are never really
7239 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7240 && targetm
.binds_local_p (decl
))
7241 maybe_assemble_visibility (decl
);
7244 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7247 default_asm_output_source_filename (FILE *file
, const char *name
)
7249 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7250 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7252 fprintf (file
, "\t.file\t");
7253 output_quoted_string (file
, name
);
7258 /* Output a file name in the form wanted by System V. */
7261 output_file_directive (FILE *asm_file
, const char *input_name
)
7266 if (input_name
== NULL
)
7267 input_name
= "<stdin>";
7269 input_name
= remap_debug_filename (input_name
);
7271 len
= strlen (input_name
);
7272 na
= input_name
+ len
;
7274 /* NA gets INPUT_NAME sans directory names. */
7275 while (na
> input_name
)
7277 if (IS_DIR_SEPARATOR (na
[-1]))
7282 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7285 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7288 make_debug_expr_from_rtl (const_rtx exp
)
7290 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7291 enum machine_mode mode
= GET_MODE (exp
);
7294 DECL_ARTIFICIAL (ddecl
) = 1;
7295 if (REG_P (exp
) && REG_EXPR (exp
))
7296 type
= TREE_TYPE (REG_EXPR (exp
));
7297 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7298 type
= TREE_TYPE (MEM_EXPR (exp
));
7301 if (type
&& TYPE_MODE (type
) == mode
)
7302 TREE_TYPE (ddecl
) = type
;
7304 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7305 DECL_MODE (ddecl
) = mode
;
7306 dval
= gen_rtx_DEBUG_EXPR (mode
);
7307 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7308 SET_DECL_RTL (ddecl
, dval
);
7312 #ifdef ELF_ASCII_ESCAPES
7313 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7316 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7321 fputs (STRING_ASM_OP
, f
);
7326 escape
= ELF_ASCII_ESCAPES
[c
];
7333 /* TODO: Print in hex with fast function, important for -flto. */
7334 fprintf (f
, "\\%03o", c
);
7347 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7350 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7352 const char *limit
= s
+ len
;
7353 const char *last_null
= NULL
;
7354 unsigned bytes_in_chunk
= 0;
7358 for (; s
< limit
; s
++)
7362 if (bytes_in_chunk
>= 60)
7371 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7378 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7380 if (bytes_in_chunk
> 0)
7387 default_elf_asm_output_limited_string (f
, s
);
7392 if (bytes_in_chunk
== 0)
7393 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7396 escape
= ELF_ASCII_ESCAPES
[c
];
7404 /* TODO: Print in hex with fast function, important for -flto. */
7405 fprintf (f
, "\\%03o", c
);
7406 bytes_in_chunk
+= 4;
7411 bytes_in_chunk
+= 2;
7418 if (bytes_in_chunk
> 0)
7426 static GTY(()) section
*elf_init_array_section
;
7427 static GTY(()) section
*elf_fini_array_section
;
7430 get_elf_initfini_array_priority_section (int priority
,
7434 if (priority
!= DEFAULT_INIT_PRIORITY
)
7437 sprintf (buf
, "%s.%.5u",
7438 constructor_p
? ".init_array" : ".fini_array",
7440 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7446 if (elf_init_array_section
== NULL
)
7447 elf_init_array_section
7448 = get_section (".init_array",
7449 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7450 sec
= elf_init_array_section
;
7454 if (elf_fini_array_section
== NULL
)
7455 elf_fini_array_section
7456 = get_section (".fini_array",
7457 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7458 sec
= elf_fini_array_section
;
7464 /* Use .init_array section for constructors. */
7467 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7469 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7471 assemble_addr_to_section (symbol
, sec
);
7474 /* Use .fini_array section for destructors. */
7477 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7479 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7481 assemble_addr_to_section (symbol
, sec
);
7484 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7486 This is a bit of a cheat. The real default is a no-op, but this
7487 hook is the default for all targets with a .ident directive. */
7490 default_asm_output_ident_directive (const char *ident_str
)
7492 const char *ident_asm_op
= "\t.ident\t";
7494 /* If we are still in the front end, do not write out the string
7495 to asm_out_file. Instead, add a fake top-level asm statement.
7496 This allows the front ends to use this hook without actually
7497 writing to asm_out_file, to handle #ident or Pragma Ident. */
7498 if (cgraph_state
== CGRAPH_STATE_PARSING
)
7500 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7501 add_asm_node (build_string (strlen (buf
), buf
));
7504 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7507 #include "gt-varasm.h"