1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997,
3 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
4 2010, 2011 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
23 /* This file handles generation of all the assembler code
24 *except* the instructions of a function.
25 This includes declarations of variables and their initial values.
27 We also output the assembler code for constants stored in memory
28 and are responsible for combining constants with the same value. */
32 #include "coretypes.h"
39 #include "hard-reg-set.h"
42 #include "diagnostic-core.h"
45 #include "langhooks.h"
49 #include "targhooks.h"
50 #include "tree-mudflap.h"
52 #include "cfglayout.h"
53 #include "basic-block.h"
54 #include "tree-iterator.h"
55 #include "pointer-set.h"
57 #ifdef XCOFF_DEBUGGING_INFO
58 #include "xcoffout.h" /* Needed for external data
59 declarations for e.g. AIX 4.x. */
62 /* The (assembler) name of the first globally-visible object output. */
63 extern GTY(()) const char *first_global_object_name
;
64 extern GTY(()) const char *weak_global_object_name
;
66 const char *first_global_object_name
;
67 const char *weak_global_object_name
;
70 struct constant_descriptor_rtx
;
71 struct rtx_constant_pool
;
73 #define n_deferred_constants (crtl->varasm.deferred_constants)
75 /* Number for making the label on the next
76 constant that is stored in memory. */
78 static GTY(()) int const_labelno
;
80 /* Carry information from ASM_DECLARE_OBJECT_NAME
81 to ASM_FINISH_DECLARE_OBJECT. */
83 int size_directive_output
;
85 /* The last decl for which assemble_variable was called,
86 if it did ASM_DECLARE_OBJECT_NAME.
87 If the last call to assemble_variable didn't do that,
90 tree last_assemble_variable_decl
;
92 /* The following global variable indicates if the first basic block
93 in a function belongs to the cold partition or not. */
95 bool first_function_block_is_cold
;
97 /* We give all constants their own alias set. Perhaps redundant with
98 MEM_READONLY_P, but pre-dates it. */
100 static alias_set_type const_alias_set
;
102 /* Whether we saw any functions with no_split_stack. */
104 static bool saw_no_split_stack
;
106 static const char *strip_reg_name (const char *);
107 static int contains_pointers_p (tree
);
108 #ifdef ASM_OUTPUT_EXTERNAL
109 static bool incorporeal_function_p (tree
);
111 static void decode_addr_const (tree
, struct addr_const
*);
112 static hashval_t
const_desc_hash (const void *);
113 static int const_desc_eq (const void *, const void *);
114 static hashval_t
const_hash_1 (const tree
);
115 static int compare_constant (const tree
, const tree
);
116 static tree
copy_constant (tree
);
117 static void output_constant_def_contents (rtx
);
118 static void output_addressed_constants (tree
);
119 static unsigned HOST_WIDE_INT
array_size_for_constructor (tree
);
120 static unsigned min_align (unsigned, unsigned);
121 static void globalize_decl (tree
);
122 static bool decl_readonly_section_1 (enum section_category
);
123 #ifdef BSS_SECTION_ASM_OP
124 #ifdef ASM_OUTPUT_ALIGNED_BSS
125 static void asm_output_aligned_bss (FILE *, tree
, const char *,
126 unsigned HOST_WIDE_INT
, int)
129 #endif /* BSS_SECTION_ASM_OP */
130 static void mark_weak (tree
);
131 static void output_constant_pool (const char *, tree
);
133 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
134 section
*text_section
;
135 section
*data_section
;
136 section
*readonly_data_section
;
137 section
*sdata_section
;
138 section
*ctors_section
;
139 section
*dtors_section
;
140 section
*bss_section
;
141 section
*sbss_section
;
143 /* Various forms of common section. All are guaranteed to be nonnull. */
144 section
*tls_comm_section
;
145 section
*comm_section
;
146 section
*lcomm_section
;
148 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
150 section
*bss_noswitch_section
;
152 /* The section that holds the main exception table, when known. The section
153 is set either by the target's init_sections hook or by the first call to
154 switch_to_exception_section. */
155 section
*exception_section
;
157 /* The section that holds the DWARF2 frame unwind information, when known.
158 The section is set either by the target's init_sections hook or by the
159 first call to switch_to_eh_frame_section. */
160 section
*eh_frame_section
;
162 /* asm_out_file's current section. This is NULL if no section has yet
163 been selected or if we lose track of what the current section is. */
166 /* True if code for the current function is currently being directed
167 at the cold section. */
168 bool in_cold_section_p
;
170 /* A linked list of all the unnamed sections. */
171 static GTY(()) section
*unnamed_sections
;
173 /* Return a nonzero value if DECL has a section attribute. */
174 #define IN_NAMED_SECTION(DECL) \
175 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
176 && DECL_SECTION_NAME (DECL) != NULL_TREE)
178 /* Hash table of named sections. */
179 static GTY((param_is (section
))) htab_t section_htab
;
181 /* A table of object_blocks, indexed by section. */
182 static GTY((param_is (struct object_block
))) htab_t object_block_htab
;
184 /* The next number to use for internal anchor labels. */
185 static GTY(()) int anchor_labelno
;
187 /* A pool of constants that can be shared between functions. */
188 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
190 /* Helper routines for maintaining section_htab. */
193 section_entry_eq (const void *p1
, const void *p2
)
195 const section
*old
= (const section
*) p1
;
196 const char *new_name
= (const char *) p2
;
198 return strcmp (old
->named
.name
, new_name
) == 0;
202 section_entry_hash (const void *p
)
204 const section
*old
= (const section
*) p
;
205 return htab_hash_string (old
->named
.name
);
208 /* Return a hash value for section SECT. */
211 hash_section (section
*sect
)
213 if (sect
->common
.flags
& SECTION_NAMED
)
214 return htab_hash_string (sect
->named
.name
);
215 return sect
->common
.flags
;
218 /* Helper routines for maintaining object_block_htab. */
221 object_block_entry_eq (const void *p1
, const void *p2
)
223 const struct object_block
*old
= (const struct object_block
*) p1
;
224 const section
*new_section
= (const section
*) p2
;
226 return old
->sect
== new_section
;
230 object_block_entry_hash (const void *p
)
232 const struct object_block
*old
= (const struct object_block
*) p
;
233 return hash_section (old
->sect
);
236 /* Return a new unnamed section with the given fields. */
239 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
244 sect
= ggc_alloc_section ();
245 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
246 sect
->unnamed
.callback
= callback
;
247 sect
->unnamed
.data
= data
;
248 sect
->unnamed
.next
= unnamed_sections
;
250 unnamed_sections
= sect
;
254 /* Return a SECTION_NOSWITCH section with the given fields. */
257 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
261 sect
= ggc_alloc_section ();
262 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
263 sect
->noswitch
.callback
= callback
;
268 /* Return the named section structure associated with NAME. Create
269 a new section with the given fields if no such structure exists. */
272 get_section (const char *name
, unsigned int flags
, tree decl
)
274 section
*sect
, **slot
;
277 htab_find_slot_with_hash (section_htab
, name
,
278 htab_hash_string (name
), INSERT
);
279 flags
|= SECTION_NAMED
;
282 sect
= ggc_alloc_section ();
283 sect
->named
.common
.flags
= flags
;
284 sect
->named
.name
= ggc_strdup (name
);
285 sect
->named
.decl
= decl
;
291 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
292 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
294 /* It is fine if one of the section flags is
295 SECTION_WRITE | SECTION_RELRO and the other has none of these
296 flags (i.e. read-only) in named sections and either the
297 section hasn't been declared yet or has been declared as writable.
298 In that case just make sure the resulting flags are
299 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
301 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
302 == (SECTION_WRITE
| SECTION_RELRO
)
303 && (sect
->common
.flags
304 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
305 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
306 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
307 || (sect
->common
.flags
& SECTION_WRITE
)))
309 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
312 /* Sanity check user variables for flag changes. */
314 decl
= sect
->named
.decl
;
316 error ("%+D causes a section type conflict", decl
);
317 /* Make sure we don't error about one section multiple times. */
318 sect
->common
.flags
|= SECTION_OVERRIDE
;
324 /* Return true if the current compilation mode benefits from having
325 objects grouped into blocks. */
328 use_object_blocks_p (void)
330 return flag_section_anchors
;
333 /* Return the object_block structure for section SECT. Create a new
334 structure if we haven't created one already. Return null if SECT
337 static struct object_block
*
338 get_block_for_section (section
*sect
)
340 struct object_block
*block
;
346 slot
= htab_find_slot_with_hash (object_block_htab
, sect
,
347 hash_section (sect
), INSERT
);
348 block
= (struct object_block
*) *slot
;
351 block
= ggc_alloc_cleared_object_block ();
358 /* Create a symbol with label LABEL and place it at byte offset
359 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
360 is not yet known. LABEL must be a garbage-collected string. */
363 create_block_symbol (const char *label
, struct object_block
*block
,
364 HOST_WIDE_INT offset
)
369 /* Create the extended SYMBOL_REF. */
370 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
371 symbol
= ggc_alloc_zone_rtx_def (size
, &rtl_zone
);
373 /* Initialize the normal SYMBOL_REF fields. */
374 memset (symbol
, 0, size
);
375 PUT_CODE (symbol
, SYMBOL_REF
);
376 PUT_MODE (symbol
, Pmode
);
377 XSTR (symbol
, 0) = label
;
378 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
380 /* Initialize the block_symbol stuff. */
381 SYMBOL_REF_BLOCK (symbol
) = block
;
382 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
387 /* Return a section with a particular name and with whatever SECTION_*
388 flags section_type_flags deems appropriate. The name of the section
389 is taken from NAME if nonnull, otherwise it is taken from DECL's
390 DECL_SECTION_NAME. DECL is the decl associated with the section
391 (see the section comment for details) and RELOC is as for
392 section_type_flags. */
395 get_named_section (tree decl
, const char *name
, int reloc
)
399 gcc_assert (!decl
|| DECL_P (decl
));
401 name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
403 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
405 return get_section (name
, flags
, decl
);
408 /* If required, set DECL_SECTION_NAME to a unique name. */
411 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
412 int flag_function_or_data_sections
)
414 if (DECL_SECTION_NAME (decl
) == NULL_TREE
415 && targetm
.have_named_sections
416 && (flag_function_or_data_sections
417 || DECL_ONE_ONLY (decl
)))
419 targetm
.asm_out
.unique_section (decl
, reloc
);
420 DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
) = true;
424 #ifdef BSS_SECTION_ASM_OP
426 #ifdef ASM_OUTPUT_ALIGNED_BSS
428 /* Utility function for targets to use in implementing
429 ASM_OUTPUT_ALIGNED_BSS.
430 ??? It is believed that this function will work in most cases so such
431 support is localized here. */
434 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
435 const char *name
, unsigned HOST_WIDE_INT size
,
438 switch_to_section (bss_section
);
439 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
440 #ifdef ASM_DECLARE_OBJECT_NAME
441 last_assemble_variable_decl
= decl
;
442 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
444 /* Standard thing is just output label for the object. */
445 ASM_OUTPUT_LABEL (file
, name
);
446 #endif /* ASM_DECLARE_OBJECT_NAME */
447 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
452 #endif /* BSS_SECTION_ASM_OP */
454 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
455 /* Return the hot section for function DECL. Return text_section for
459 hot_function_section (tree decl
)
461 if (decl
!= NULL_TREE
462 && DECL_SECTION_NAME (decl
) != NULL_TREE
463 && targetm
.have_named_sections
)
464 return get_named_section (decl
, NULL
, 0);
470 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
473 When DECL_SECTION_NAME is non-NULL and it is implicit section and
474 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
475 concatenate the name with NAMED_SECTION_SUFFIX.
476 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
479 get_named_text_section (tree decl
,
480 const char *text_section_name
,
481 const char *named_section_suffix
)
483 if (decl
&& DECL_SECTION_NAME (decl
))
485 if (named_section_suffix
)
487 tree dsn
= DECL_SECTION_NAME (decl
);
488 const char *stripped_name
;
491 name
= (char *) alloca (TREE_STRING_LENGTH (dsn
) + 1);
492 memcpy (name
, TREE_STRING_POINTER (dsn
),
493 TREE_STRING_LENGTH (dsn
) + 1);
495 stripped_name
= targetm
.strip_name_encoding (name
);
497 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
498 return get_named_section (decl
, buffer
, 0);
500 else if (DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
))
504 /* Do not try to split gnu_linkonce functions. This gets somewhat
506 if (DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
)
508 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
509 name
= targetm
.strip_name_encoding (name
);
510 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
516 return get_named_section (decl
, text_section_name
, 0);
519 /* Choose named function section based on its frequency. */
522 default_function_section (tree decl
, enum node_frequency freq
,
523 bool startup
, bool exit
)
525 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
526 /* Old GNU linkers have buggy --gc-section support, which sometimes
527 results in .gcc_except_table* sections being garbage collected. */
529 && DECL_SECTION_NAME (decl
)
530 && DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
))
534 if (!flag_reorder_functions
535 || !targetm
.have_named_sections
)
537 /* Startup code should go to startup subsection unless it is
538 unlikely executed (this happens especially with function splitting
539 where we can split away unnecesary parts of static constructors. */
540 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
541 return get_named_text_section (decl
, ".text.startup", NULL
);
543 /* Similarly for exit. */
544 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
545 return get_named_text_section (decl
, ".text.exit", NULL
);
547 /* Group cold functions together, similarly for hot code. */
550 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
551 return get_named_text_section (decl
, ".text.unlikely", NULL
);
552 case NODE_FREQUENCY_HOT
:
553 return get_named_text_section (decl
, ".text.hot", NULL
);
559 /* Return the section for function DECL.
561 If DECL is NULL_TREE, return the text section. We can be passed
562 NULL_TREE under some circumstances by dbxout.c at least.
564 If FORCE_COLD is true, return cold function section ignoring
565 the frequency info of cgraph_node. */
568 function_section_1 (tree decl
, bool force_cold
)
570 section
*section
= NULL
;
571 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
572 bool startup
= false, exit
= false;
576 struct cgraph_node
*node
= cgraph_get_node (decl
);
580 freq
= node
->frequency
;
581 startup
= node
->only_called_at_startup
;
582 exit
= node
->only_called_at_exit
;
586 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
588 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
589 if (decl
!= NULL_TREE
590 && DECL_SECTION_NAME (decl
) != NULL_TREE
)
592 if (targetm
.asm_out
.function_section
)
593 section
= targetm
.asm_out
.function_section (decl
, freq
,
597 return get_named_section (decl
, NULL
, 0);
600 return targetm
.asm_out
.select_section
601 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
604 if (targetm
.asm_out
.function_section
)
605 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
608 return hot_function_section (decl
);
612 /* Return the section for function DECL.
614 If DECL is NULL_TREE, return the text section. We can be passed
615 NULL_TREE under some circumstances by dbxout.c at least. */
618 function_section (tree decl
)
620 /* Handle cases where function splitting code decides
621 to put function entry point into unlikely executed section
622 despite the fact that the function itself is not cold
623 (i.e. it is called rarely but contains a hot loop that is
624 better to live in hot subsection for the code locality). */
625 return function_section_1 (decl
,
626 first_function_block_is_cold
);
629 /* Return the section for the current function, take IN_COLD_SECTION_P
633 current_function_section (void)
635 return function_section_1 (current_function_decl
, in_cold_section_p
);
638 /* Tell assembler to switch to unlikely-to-be-executed text section. */
641 unlikely_text_section (void)
643 return function_section_1 (current_function_decl
, true);
646 /* When called within a function context, return true if the function
647 has been assigned a cold text section and if SECT is that section.
648 When called outside a function context, return true if SECT is the
649 default cold section. */
652 unlikely_text_section_p (section
*sect
)
654 return sect
== function_section_1 (current_function_decl
, true);
657 /* Return the read-only data section associated with function DECL. */
660 default_function_rodata_section (tree decl
)
662 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
664 const char *name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
666 if (DECL_ONE_ONLY (decl
) && HAVE_COMDAT_GROUP
)
672 dot
= strchr (name
+ 1, '.');
675 len
= strlen (dot
) + 8;
676 rname
= (char *) alloca (len
);
678 strcpy (rname
, ".rodata");
680 return get_section (rname
, SECTION_LINKONCE
, decl
);
682 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
683 else if (DECL_ONE_ONLY (decl
)
684 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
686 size_t len
= strlen (name
) + 1;
687 char *rname
= (char *) alloca (len
);
689 memcpy (rname
, name
, len
);
691 return get_section (rname
, SECTION_LINKONCE
, decl
);
693 /* For .text.foo we want to use .rodata.foo. */
694 else if (flag_function_sections
&& flag_data_sections
695 && strncmp (name
, ".text.", 6) == 0)
697 size_t len
= strlen (name
) + 1;
698 char *rname
= (char *) alloca (len
+ 2);
700 memcpy (rname
, ".rodata", 7);
701 memcpy (rname
+ 7, name
+ 5, len
- 5);
702 return get_section (rname
, 0, decl
);
706 return readonly_data_section
;
709 /* Return the read-only data section associated with function DECL
710 for targets where that section should be always the single
711 readonly data section. */
714 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
716 return readonly_data_section
;
719 /* Return the section to use for string merging. */
722 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
723 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
724 unsigned int flags ATTRIBUTE_UNUSED
)
728 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
729 && TREE_CODE (decl
) == STRING_CST
730 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
732 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
733 && TREE_STRING_LENGTH (decl
) >= len
)
735 enum machine_mode mode
;
736 unsigned int modesize
;
742 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
743 modesize
= GET_MODE_BITSIZE (mode
);
744 if (modesize
>= 8 && modesize
<= 256
745 && (modesize
& (modesize
- 1)) == 0)
747 if (align
< modesize
)
750 str
= TREE_STRING_POINTER (decl
);
751 unit
= GET_MODE_SIZE (mode
);
753 /* Check for embedded NUL characters. */
754 for (i
= 0; i
< len
; i
+= unit
)
756 for (j
= 0; j
< unit
; j
++)
757 if (str
[i
+ j
] != '\0')
764 sprintf (name
, ".rodata.str%d.%d", modesize
/ 8,
766 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
767 return get_section (name
, flags
, NULL
);
772 return readonly_data_section
;
775 /* Return the section to use for constant merging. */
778 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
779 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
780 unsigned int flags ATTRIBUTE_UNUSED
)
782 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
784 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
790 && (align
& (align
- 1)) == 0)
794 sprintf (name
, ".rodata.cst%d", (int) (align
/ 8));
795 flags
|= (align
/ 8) | SECTION_MERGE
;
796 return get_section (name
, flags
, NULL
);
798 return readonly_data_section
;
801 /* Given NAME, a putative register name, discard any customary prefixes. */
804 strip_reg_name (const char *name
)
806 #ifdef REGISTER_PREFIX
807 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
808 name
+= strlen (REGISTER_PREFIX
);
810 if (name
[0] == '%' || name
[0] == '#')
815 /* The user has asked for a DECL to have a particular name. Set (or
816 change) it in such a way that we don't prefix an underscore to
819 set_user_assembler_name (tree decl
, const char *name
)
821 char *starred
= (char *) alloca (strlen (name
) + 2);
823 strcpy (starred
+ 1, name
);
824 change_decl_assembler_name (decl
, get_identifier (starred
));
825 SET_DECL_RTL (decl
, NULL_RTX
);
828 /* Decode an `asm' spec for a declaration as a register name.
829 Return the register number, or -1 if nothing specified,
830 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
831 or -3 if ASMSPEC is `cc' and is not recognized,
832 or -4 if ASMSPEC is `memory' and is not recognized.
833 Accept an exact spelling or a decimal number.
834 Prefixes such as % are optional. */
837 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
839 /* Presume just one register is clobbered. */
846 /* Get rid of confusing prefixes. */
847 asmspec
= strip_reg_name (asmspec
);
849 /* Allow a decimal number as a "register name". */
850 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
851 if (! ISDIGIT (asmspec
[i
]))
853 if (asmspec
[0] != 0 && i
< 0)
856 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0)
862 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
864 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
867 #ifdef OVERLAPPING_REGISTER_NAMES
871 const char *const name
;
874 } table
[] = OVERLAPPING_REGISTER_NAMES
;
876 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
878 && ! strcmp (asmspec
, table
[i
].name
))
880 *pnregs
= table
[i
].nregs
;
881 return table
[i
].number
;
884 #endif /* OVERLAPPING_REGISTER_NAMES */
886 #ifdef ADDITIONAL_REGISTER_NAMES
888 static const struct { const char *const name
; const int number
; } table
[]
889 = ADDITIONAL_REGISTER_NAMES
;
891 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
893 && ! strcmp (asmspec
, table
[i
].name
))
894 return table
[i
].number
;
896 #endif /* ADDITIONAL_REGISTER_NAMES */
898 if (!strcmp (asmspec
, "memory"))
901 if (!strcmp (asmspec
, "cc"))
911 decode_reg_name (const char *name
)
914 return decode_reg_name_and_count (name
, &count
);
918 /* Return true if DECL's initializer is suitable for a BSS section. */
921 bss_initializer_p (const_tree decl
)
923 return (DECL_INITIAL (decl
) == NULL
924 || DECL_INITIAL (decl
) == error_mark_node
925 || (flag_zero_initialized_in_bss
926 /* Leave constant zeroes in .rodata so they
928 && !TREE_READONLY (decl
)
929 && initializer_zerop (DECL_INITIAL (decl
))));
932 /* Compute the alignment of variable specified by DECL.
933 DONT_OUTPUT_DATA is from assemble_variable. */
936 align_variable (tree decl
, bool dont_output_data
)
938 unsigned int align
= DECL_ALIGN (decl
);
940 /* In the case for initialing an array whose length isn't specified,
941 where we have not yet been able to do the layout,
942 figure out the proper alignment now. */
943 if (dont_output_data
&& DECL_SIZE (decl
) == 0
944 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
945 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
947 /* Some object file formats have a maximum alignment which they support.
948 In particular, a.out format supports a maximum alignment of 4. */
949 if (align
> MAX_OFILE_ALIGNMENT
)
951 warning (0, "alignment of %q+D is greater than maximum object "
952 "file alignment. Using %d", decl
,
953 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
954 align
= MAX_OFILE_ALIGNMENT
;
957 /* On some machines, it is good to increase alignment sometimes. */
958 if (! DECL_USER_ALIGN (decl
))
960 #ifdef DATA_ALIGNMENT
961 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
962 /* Don't increase alignment too much for TLS variables - TLS space
964 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
967 #ifdef CONSTANT_ALIGNMENT
968 if (DECL_INITIAL (decl
) != 0 && DECL_INITIAL (decl
) != error_mark_node
)
970 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
972 /* Don't increase alignment too much for TLS variables - TLS space
974 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
980 /* Reset the alignment in case we have made it tighter, so we can benefit
981 from it in get_pointer_alignment. */
982 DECL_ALIGN (decl
) = align
;
985 /* Return the section into which the given VAR_DECL or CONST_DECL
986 should be placed. PREFER_NOSWITCH_P is true if a noswitch
987 section should be used wherever possible. */
990 get_variable_section (tree decl
, bool prefer_noswitch_p
)
992 addr_space_t as
= ADDR_SPACE_GENERIC
;
995 if (TREE_TYPE (decl
) != error_mark_node
)
996 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
998 if (DECL_COMMON (decl
))
1000 /* If the decl has been given an explicit section name, or it resides
1001 in a non-generic address space, then it isn't common, and shouldn't
1002 be handled as such. */
1003 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1004 && ADDR_SPACE_GENERIC_P (as
));
1005 if (DECL_THREAD_LOCAL_P (decl
))
1006 return tls_comm_section
;
1007 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1008 return comm_section
;
1011 if (DECL_INITIAL (decl
) == error_mark_node
)
1012 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1013 else if (DECL_INITIAL (decl
))
1014 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1018 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1019 if (IN_NAMED_SECTION (decl
))
1020 return get_named_section (decl
, NULL
, reloc
);
1022 if (ADDR_SPACE_GENERIC_P (as
)
1023 && !DECL_THREAD_LOCAL_P (decl
)
1024 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1025 && bss_initializer_p (decl
))
1027 if (!TREE_PUBLIC (decl
))
1028 return lcomm_section
;
1029 if (bss_noswitch_section
)
1030 return bss_noswitch_section
;
1033 return targetm
.asm_out
.select_section (decl
, reloc
, DECL_ALIGN (decl
));
1036 /* Return the block into which object_block DECL should be placed. */
1038 static struct object_block
*
1039 get_block_for_decl (tree decl
)
1043 if (TREE_CODE (decl
) == VAR_DECL
)
1045 /* The object must be defined in this translation unit. */
1046 if (DECL_EXTERNAL (decl
))
1049 /* There's no point using object blocks for something that is
1050 isolated by definition. */
1051 if (DECL_ONE_ONLY (decl
))
1055 /* We can only calculate block offsets if the decl has a known
1057 if (DECL_SIZE_UNIT (decl
) == NULL
)
1059 if (!host_integerp (DECL_SIZE_UNIT (decl
), 1))
1062 /* Find out which section should contain DECL. We cannot put it into
1063 an object block if it requires a standalone definition. */
1064 if (TREE_CODE (decl
) == VAR_DECL
)
1065 align_variable (decl
, 0);
1066 sect
= get_variable_section (decl
, true);
1067 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1070 return get_block_for_section (sect
);
1073 /* Make sure block symbol SYMBOL is in block BLOCK. */
1076 change_symbol_block (rtx symbol
, struct object_block
*block
)
1078 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1080 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1081 SYMBOL_REF_BLOCK (symbol
) = block
;
1085 /* Return true if it is possible to put DECL in an object_block. */
1088 use_blocks_for_decl_p (tree decl
)
1090 /* Only data DECLs can be placed into object blocks. */
1091 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1094 /* Detect decls created by dw2_force_const_mem. Such decls are
1095 special because DECL_INITIAL doesn't specify the decl's true value.
1096 dw2_output_indirect_constants will instead call assemble_variable
1097 with dont_output_data set to 1 and then print the contents itself. */
1098 if (DECL_INITIAL (decl
) == decl
)
1101 /* If this decl is an alias, then we don't want to emit a
1103 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)))
1109 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1110 have static storage duration. In other words, it should not be an
1111 automatic variable, including PARM_DECLs.
1113 There is, however, one exception: this function handles variables
1114 explicitly placed in a particular register by the user.
1116 This is never called for PARM_DECL nodes. */
1119 make_decl_rtl (tree decl
)
1121 const char *name
= 0;
1125 /* Check that we are not being given an automatic variable. */
1126 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1127 && TREE_CODE (decl
) != RESULT_DECL
);
1129 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1130 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1131 || TREE_STATIC (decl
)
1132 || TREE_PUBLIC (decl
)
1133 || DECL_EXTERNAL (decl
)
1134 || DECL_REGISTER (decl
));
1136 /* And that we were not given a type or a label. */
1137 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1138 && TREE_CODE (decl
) != LABEL_DECL
);
1140 /* For a duplicate declaration, we can be called twice on the
1141 same DECL node. Don't discard the RTL already made. */
1142 if (DECL_RTL_SET_P (decl
))
1144 /* If the old RTL had the wrong mode, fix the mode. */
1145 x
= DECL_RTL (decl
);
1146 if (GET_MODE (x
) != DECL_MODE (decl
))
1147 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1149 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1152 /* ??? Another way to do this would be to maintain a hashed
1153 table of such critters. Instead of adding stuff to a DECL
1154 to give certain attributes to it, we could use an external
1155 hash map from DECL to set of attributes. */
1157 /* Let the target reassign the RTL if it wants.
1158 This is necessary, for example, when one machine specific
1159 decl attribute overrides another. */
1160 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1162 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1163 on the new decl information. */
1165 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1166 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1167 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1169 /* Make this function static known to the mudflap runtime. */
1170 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1171 mudflap_enqueue_decl (decl
);
1176 /* If this variable belongs to the global constant pool, retrieve the
1177 pre-computed RTL or recompute it in LTO mode. */
1178 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_IN_CONSTANT_POOL (decl
))
1180 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1184 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
1186 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1187 && DECL_REGISTER (decl
))
1189 error ("register name not specified for %q+D", decl
);
1191 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1193 const char *asmspec
= name
+1;
1194 reg_number
= decode_reg_name (asmspec
);
1195 /* First detect errors in declaring global registers. */
1196 if (reg_number
== -1)
1197 error ("register name not specified for %q+D", decl
);
1198 else if (reg_number
< 0)
1199 error ("invalid register name for %q+D", decl
);
1200 else if (TYPE_MODE (TREE_TYPE (decl
)) == BLKmode
)
1201 error ("data type of %q+D isn%'t suitable for a register",
1203 else if (! HARD_REGNO_MODE_OK (reg_number
, TYPE_MODE (TREE_TYPE (decl
))))
1204 error ("register specified for %q+D isn%'t suitable for data type",
1206 /* Now handle properly declared static register variables. */
1211 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1213 DECL_INITIAL (decl
) = 0;
1214 error ("global register variable has initial value");
1216 if (TREE_THIS_VOLATILE (decl
))
1217 warning (OPT_Wvolatile_register_var
,
1218 "optimization may eliminate reads and/or "
1219 "writes to register variables");
1221 /* If the user specified one of the eliminables registers here,
1222 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1223 confused with that register and be eliminated. This usage is
1224 somewhat suspect... */
1226 SET_DECL_RTL (decl
, gen_rtx_raw_REG (DECL_MODE (decl
), reg_number
));
1227 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1228 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1230 if (TREE_STATIC (decl
))
1232 /* Make this register global, so not usable for anything
1234 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1235 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1236 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1238 nregs
= hard_regno_nregs
[reg_number
][DECL_MODE (decl
)];
1240 globalize_reg (reg_number
+ --nregs
);
1243 /* As a register variable, it has no section. */
1247 /* Now handle ordinary static variables and functions (in memory).
1248 Also handle vars declared register invalidly. */
1249 else if (name
[0] == '*')
1251 #ifdef REGISTER_PREFIX
1252 if (strlen (REGISTER_PREFIX
) != 0)
1254 reg_number
= decode_reg_name (name
);
1255 if (reg_number
>= 0 || reg_number
== -3)
1256 error ("register name given for non-register variable %q+D", decl
);
1261 /* Specifying a section attribute on a variable forces it into a
1262 non-.bss section, and thus it cannot be common. */
1263 /* FIXME: In general this code should not be necessary because
1264 visibility pass is doing the same work. But notice_global_symbol
1265 is called early and it needs to make DECL_RTL to get the name.
1266 we take care of recomputing the DECL_RTL after visibility is changed. */
1267 if (TREE_CODE (decl
) == VAR_DECL
1268 && DECL_SECTION_NAME (decl
) != NULL_TREE
1269 && DECL_INITIAL (decl
) == NULL_TREE
1270 && DECL_COMMON (decl
))
1271 DECL_COMMON (decl
) = 0;
1273 /* Variables can't be both common and weak. */
1274 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1275 DECL_COMMON (decl
) = 0;
1277 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1278 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1281 enum machine_mode address_mode
= Pmode
;
1282 if (TREE_TYPE (decl
) != error_mark_node
)
1284 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1285 address_mode
= targetm
.addr_space
.address_mode (as
);
1287 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1289 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1290 SET_SYMBOL_REF_DECL (x
, decl
);
1292 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1293 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1294 set_mem_attributes (x
, decl
, 1);
1295 SET_DECL_RTL (decl
, x
);
1297 /* Optionally set flags or add text to the name to record information
1298 such as that it is a function name.
1299 If the name is changed, the macro ASM_OUTPUT_LABELREF
1300 will have to know how to strip this information. */
1301 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1303 /* Make this function static known to the mudflap runtime. */
1304 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1305 mudflap_enqueue_decl (decl
);
1308 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1309 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1313 make_decl_rtl_for_debug (tree decl
)
1315 unsigned int save_aliasing_flag
, save_mudflap_flag
;
1318 if (DECL_RTL_SET_P (decl
))
1319 return DECL_RTL (decl
);
1321 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1322 call new_alias_set. If running with -fcompare-debug, sometimes
1323 we do not want to create alias sets that will throw the alias
1324 numbers off in the comparison dumps. So... clearing
1325 flag_strict_aliasing will keep new_alias_set() from creating a
1326 new set. It is undesirable to register decl with mudflap
1327 in this case as well. */
1328 save_aliasing_flag
= flag_strict_aliasing
;
1329 flag_strict_aliasing
= 0;
1330 save_mudflap_flag
= flag_mudflap
;
1333 rtl
= DECL_RTL (decl
);
1334 /* Reset DECL_RTL back, as various parts of the compiler expects
1335 DECL_RTL set meaning it is actually going to be output. */
1336 SET_DECL_RTL (decl
, NULL
);
1338 flag_strict_aliasing
= save_aliasing_flag
;
1339 flag_mudflap
= save_mudflap_flag
;
1344 /* Output a string of literal assembler code
1345 for an `asm' keyword used between functions. */
1348 assemble_asm (tree string
)
1352 if (TREE_CODE (string
) == ADDR_EXPR
)
1353 string
= TREE_OPERAND (string
, 0);
1355 fprintf (asm_out_file
, "\t%s\n", TREE_STRING_POINTER (string
));
1358 /* Record an element in the table of global destructors. SYMBOL is
1359 a SYMBOL_REF of the function to be called; PRIORITY is a number
1360 between 0 and MAX_INIT_PRIORITY. */
1363 default_stabs_asm_out_destructor (rtx symbol ATTRIBUTE_UNUSED
,
1364 int priority ATTRIBUTE_UNUSED
)
1366 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1367 /* Tell GNU LD that this is part of the static destructor set.
1368 This will work for any system that uses stabs, most usefully
1370 dbxout_begin_simple_stabs ("___DTOR_LIST__", 22 /* N_SETT */);
1371 dbxout_stab_value_label (XSTR (symbol
, 0));
1373 sorry ("global destructors not supported on this target");
1377 /* Write the address of the entity given by SYMBOL to SEC. */
1379 assemble_addr_to_section (rtx symbol
, section
*sec
)
1381 switch_to_section (sec
);
1382 assemble_align (POINTER_SIZE
);
1383 assemble_integer (symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1386 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1387 not) section for PRIORITY. */
1389 get_cdtor_priority_section (int priority
, bool constructor_p
)
1393 /* ??? This only works reliably with the GNU linker. */
1394 sprintf (buf
, "%s.%.5u",
1395 constructor_p
? ".ctors" : ".dtors",
1396 /* Invert the numbering so the linker puts us in the proper
1397 order; constructors are run from right to left, and the
1398 linker sorts in increasing order. */
1399 MAX_INIT_PRIORITY
- priority
);
1400 return get_section (buf
, SECTION_WRITE
, NULL
);
1404 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1408 if (priority
!= DEFAULT_INIT_PRIORITY
)
1409 sec
= get_cdtor_priority_section (priority
,
1410 /*constructor_p=*/false);
1412 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1414 assemble_addr_to_section (symbol
, sec
);
1417 #ifdef DTORS_SECTION_ASM_OP
1419 default_dtor_section_asm_out_destructor (rtx symbol
,
1420 int priority ATTRIBUTE_UNUSED
)
1422 assemble_addr_to_section (symbol
, dtors_section
);
1426 /* Likewise for global constructors. */
1429 default_stabs_asm_out_constructor (rtx symbol ATTRIBUTE_UNUSED
,
1430 int priority ATTRIBUTE_UNUSED
)
1432 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1433 /* Tell GNU LD that this is part of the static destructor set.
1434 This will work for any system that uses stabs, most usefully
1436 dbxout_begin_simple_stabs ("___CTOR_LIST__", 22 /* N_SETT */);
1437 dbxout_stab_value_label (XSTR (symbol
, 0));
1439 sorry ("global constructors not supported on this target");
1444 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1448 if (priority
!= DEFAULT_INIT_PRIORITY
)
1449 sec
= get_cdtor_priority_section (priority
,
1450 /*constructor_p=*/true);
1452 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1454 assemble_addr_to_section (symbol
, sec
);
1457 #ifdef CTORS_SECTION_ASM_OP
1459 default_ctor_section_asm_out_constructor (rtx symbol
,
1460 int priority ATTRIBUTE_UNUSED
)
1462 assemble_addr_to_section (symbol
, ctors_section
);
1466 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1467 a nonzero value if the constant pool should be output before the
1468 start of the function, or a zero value if the pool should output
1469 after the end of the function. The default is to put it before the
1472 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1473 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1476 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1477 to be output to assembler.
1478 Set first_global_object_name and weak_global_object_name as appropriate. */
1481 notice_global_symbol (tree decl
)
1483 const char **type
= &first_global_object_name
;
1485 if (first_global_object_name
1486 || !TREE_PUBLIC (decl
)
1487 || DECL_EXTERNAL (decl
)
1488 || !DECL_NAME (decl
)
1489 || (TREE_CODE (decl
) != FUNCTION_DECL
1490 && (TREE_CODE (decl
) != VAR_DECL
1491 || (DECL_COMMON (decl
)
1492 && (DECL_INITIAL (decl
) == 0
1493 || DECL_INITIAL (decl
) == error_mark_node
))))
1494 || !MEM_P (DECL_RTL (decl
)))
1497 /* We win when global object is found, but it is useful to know about weak
1498 symbol as well so we can produce nicer unique names. */
1499 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1500 type
= &weak_global_object_name
;
1506 rtx decl_rtl
= DECL_RTL (decl
);
1508 p
= targetm
.strip_name_encoding (XSTR (XEXP (decl_rtl
, 0), 0));
1509 name
= ggc_strdup (p
);
1515 /* Output assembler code for the constant pool of a function and associated
1516 with defining the name of the function. DECL describes the function.
1517 NAME is the function's name. For the constant pool, we use the current
1518 constant pool data. */
1521 assemble_start_function (tree decl
, const char *fnname
)
1524 char tmp_label
[100];
1525 bool hot_label_written
= false;
1527 first_function_block_is_cold
= false;
1528 if (flag_reorder_blocks_and_partition
)
1530 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1531 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1532 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1533 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1534 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1535 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1536 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1537 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1542 crtl
->subsections
.hot_section_label
= NULL
;
1543 crtl
->subsections
.cold_section_label
= NULL
;
1544 crtl
->subsections
.hot_section_end_label
= NULL
;
1545 crtl
->subsections
.cold_section_end_label
= NULL
;
1548 /* The following code does not need preprocessing in the assembler. */
1552 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1553 output_constant_pool (fnname
, decl
);
1555 /* Make sure the not and cold text (code) sections are properly
1556 aligned. This is necessary here in the case where the function
1557 has both hot and cold sections, because we don't want to re-set
1558 the alignment when the section switch happens mid-function. */
1560 if (flag_reorder_blocks_and_partition
)
1562 switch_to_section (unlikely_text_section ());
1563 assemble_align (DECL_ALIGN (decl
));
1564 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1566 /* When the function starts with a cold section, we need to explicitly
1567 align the hot section and write out the hot section label.
1568 But if the current function is a thunk, we do not have a CFG. */
1570 && BB_PARTITION (ENTRY_BLOCK_PTR
->next_bb
) == BB_COLD_PARTITION
)
1572 switch_to_section (text_section
);
1573 assemble_align (DECL_ALIGN (decl
));
1574 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1575 hot_label_written
= true;
1576 first_function_block_is_cold
= true;
1579 else if (DECL_SECTION_NAME (decl
))
1581 struct cgraph_node
*node
= cgraph_get_node (current_function_decl
);
1582 /* Calls to function_section rely on first_function_block_is_cold
1584 first_function_block_is_cold
= (node
1586 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1589 in_cold_section_p
= first_function_block_is_cold
;
1591 /* Switch to the correct text section for the start of the function. */
1593 switch_to_section (function_section (decl
));
1594 if (flag_reorder_blocks_and_partition
1595 && !hot_label_written
)
1596 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1598 /* Tell assembler to move to target machine's alignment for functions. */
1599 align
= floor_log2 (DECL_ALIGN (decl
) / BITS_PER_UNIT
);
1602 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1605 /* Handle a user-specified function alignment.
1606 Note that we still need to align to DECL_ALIGN, as above,
1607 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1608 if (! DECL_USER_ALIGN (decl
)
1609 && align_functions_log
> align
1610 && optimize_function_for_speed_p (cfun
))
1612 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1613 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1614 align_functions_log
, align_functions
- 1);
1616 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1620 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1621 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1624 if (!DECL_IGNORED_P (decl
))
1625 (*debug_hooks
->begin_function
) (decl
);
1627 /* Make function name accessible from other files, if appropriate. */
1629 if (TREE_PUBLIC (decl
))
1631 notice_global_symbol (decl
);
1633 globalize_decl (decl
);
1635 maybe_assemble_visibility (decl
);
1638 if (DECL_PRESERVE_P (decl
))
1639 targetm
.asm_out
.mark_decl_preserved (fnname
);
1641 /* Do any machine/system dependent processing of the function name. */
1642 #ifdef ASM_DECLARE_FUNCTION_NAME
1643 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1645 /* Standard thing is just output label for the function. */
1646 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1647 #endif /* ASM_DECLARE_FUNCTION_NAME */
1649 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1650 saw_no_split_stack
= true;
1653 /* Output assembler code associated with defining the size of the
1654 function. DECL describes the function. NAME is the function's name. */
1657 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1659 #ifdef ASM_DECLARE_FUNCTION_SIZE
1660 /* We could have switched section in the middle of the function. */
1661 if (flag_reorder_blocks_and_partition
)
1662 switch_to_section (function_section (decl
));
1663 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1665 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1667 output_constant_pool (fnname
, decl
);
1668 switch_to_section (function_section (decl
)); /* need to switch back */
1670 /* Output labels for end of hot/cold text sections (to be used by
1672 if (flag_reorder_blocks_and_partition
)
1674 section
*save_text_section
;
1676 save_text_section
= in_section
;
1677 switch_to_section (unlikely_text_section ());
1678 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1679 if (first_function_block_is_cold
)
1680 switch_to_section (text_section
);
1682 switch_to_section (function_section (decl
));
1683 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1684 switch_to_section (save_text_section
);
1688 /* Assemble code to leave SIZE bytes of zeros. */
1691 assemble_zeros (unsigned HOST_WIDE_INT size
)
1693 /* Do no output if -fsyntax-only. */
1694 if (flag_syntax_only
)
1697 #ifdef ASM_NO_SKIP_IN_TEXT
1698 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1699 so we must output 0s explicitly in the text section. */
1700 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1702 unsigned HOST_WIDE_INT i
;
1703 for (i
= 0; i
< size
; i
++)
1704 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1709 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1712 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1715 assemble_align (int align
)
1717 if (align
> BITS_PER_UNIT
)
1719 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1723 /* Assemble a string constant with the specified C string as contents. */
1726 assemble_string (const char *p
, int size
)
1731 /* If the string is very long, split it up. */
1735 int thissize
= size
- pos
;
1736 if (thissize
> maximum
)
1739 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1747 /* A noswitch_section_callback for lcomm_section. */
1750 emit_local (tree decl ATTRIBUTE_UNUSED
,
1751 const char *name ATTRIBUTE_UNUSED
,
1752 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1753 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1755 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1756 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1757 size
, DECL_ALIGN (decl
));
1759 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1760 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1763 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1768 /* A noswitch_section_callback for bss_noswitch_section. */
1770 #if defined ASM_OUTPUT_ALIGNED_BSS
1772 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1773 const char *name ATTRIBUTE_UNUSED
,
1774 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1775 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1777 #if defined ASM_OUTPUT_ALIGNED_BSS
1778 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
, DECL_ALIGN (decl
));
1784 /* A noswitch_section_callback for comm_section. */
1787 emit_common (tree decl ATTRIBUTE_UNUSED
,
1788 const char *name ATTRIBUTE_UNUSED
,
1789 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1790 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1792 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1793 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1794 size
, DECL_ALIGN (decl
));
1796 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1797 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1800 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1805 /* A noswitch_section_callback for tls_comm_section. */
1808 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1809 const char *name ATTRIBUTE_UNUSED
,
1810 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1811 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1813 #ifdef ASM_OUTPUT_TLS_COMMON
1814 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
1817 sorry ("thread-local COMMON data not implemented");
1822 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1823 NAME is the name of DECL's SYMBOL_REF. */
1826 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
)
1828 unsigned HOST_WIDE_INT size
, rounded
;
1830 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
1833 /* Don't allocate zero bytes of common,
1834 since that means "undefined external" in the linker. */
1838 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1839 so that each uninitialized object starts on such a boundary. */
1840 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
1841 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
1842 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
1844 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
1845 && (unsigned HOST_WIDE_INT
) DECL_ALIGN_UNIT (decl
) > rounded
)
1846 warning (0, "requested alignment for %q+D is greater than "
1847 "implemented alignment of %wu", decl
, rounded
);
1850 /* A subroutine of assemble_variable. Output the label and contents of
1851 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1852 is as for assemble_variable. */
1855 assemble_variable_contents (tree decl
, const char *name
,
1856 bool dont_output_data
)
1858 /* Do any machine/system dependent processing of the object. */
1859 #ifdef ASM_DECLARE_OBJECT_NAME
1860 last_assemble_variable_decl
= decl
;
1861 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
1863 /* Standard thing is just output label for the object. */
1864 ASM_OUTPUT_LABEL (asm_out_file
, name
);
1865 #endif /* ASM_DECLARE_OBJECT_NAME */
1867 if (!dont_output_data
)
1869 if (DECL_INITIAL (decl
)
1870 && DECL_INITIAL (decl
) != error_mark_node
1871 && !initializer_zerop (DECL_INITIAL (decl
)))
1872 /* Output the actual data. */
1873 output_constant (DECL_INITIAL (decl
),
1874 tree_low_cst (DECL_SIZE_UNIT (decl
), 1),
1877 /* Leave space for it. */
1878 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl
), 1));
1882 /* Assemble everything that is needed for a variable or function declaration.
1883 Not used for automatic variables, and not used for function definitions.
1884 Should not be called for variables of incomplete structure type.
1886 TOP_LEVEL is nonzero if this variable has file scope.
1887 AT_END is nonzero if this is the special handling, at end of compilation,
1888 to define things that have had only tentative definitions.
1889 DONT_OUTPUT_DATA if nonzero means don't actually output the
1890 initial value (that will be done by the caller). */
1893 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
1894 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
1897 rtx decl_rtl
, symbol
;
1900 /* This function is supposed to handle VARIABLES. Ensure we have one. */
1901 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
1903 /* Emulated TLS had better not get this far. */
1904 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
1906 last_assemble_variable_decl
= 0;
1908 /* Normally no need to say anything here for external references,
1909 since assemble_external is called by the language-specific code
1910 when a declaration is first seen. */
1912 if (DECL_EXTERNAL (decl
))
1915 /* Do nothing for global register variables. */
1916 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
1918 TREE_ASM_WRITTEN (decl
) = 1;
1922 /* If type was incomplete when the variable was declared,
1923 see if it is complete now. */
1925 if (DECL_SIZE (decl
) == 0)
1926 layout_decl (decl
, 0);
1928 /* Still incomplete => don't allocate it; treat the tentative defn
1929 (which is what it must have been) as an `extern' reference. */
1931 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
1933 error ("storage size of %q+D isn%'t known", decl
);
1934 TREE_ASM_WRITTEN (decl
) = 1;
1938 /* The first declaration of a variable that comes through this function
1939 decides whether it is global (in C, has external linkage)
1940 or local (in C, has internal linkage). So do nothing more
1941 if this function has already run. */
1943 if (TREE_ASM_WRITTEN (decl
))
1946 /* Make sure targetm.encode_section_info is invoked before we set
1948 decl_rtl
= DECL_RTL (decl
);
1950 TREE_ASM_WRITTEN (decl
) = 1;
1952 /* Do no output if -fsyntax-only. */
1953 if (flag_syntax_only
)
1956 if (! dont_output_data
1957 && ! host_integerp (DECL_SIZE_UNIT (decl
), 1))
1959 error ("size of variable %q+D is too large", decl
);
1963 gcc_assert (MEM_P (decl_rtl
));
1964 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
1965 symbol
= XEXP (decl_rtl
, 0);
1967 /* If this symbol belongs to the tree constant pool, output the constant
1968 if it hasn't already been written. */
1969 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
1971 tree decl
= SYMBOL_REF_DECL (symbol
);
1972 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
1973 output_constant_def_contents (symbol
);
1979 name
= XSTR (symbol
, 0);
1980 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
1981 notice_global_symbol (decl
);
1983 /* Compute the alignment of this data. */
1985 align_variable (decl
, dont_output_data
);
1986 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
1988 if (TREE_PUBLIC (decl
))
1989 maybe_assemble_visibility (decl
);
1991 if (DECL_PRESERVE_P (decl
))
1992 targetm
.asm_out
.mark_decl_preserved (name
);
1994 /* First make the assembler name(s) global if appropriate. */
1995 sect
= get_variable_section (decl
, false);
1996 if (TREE_PUBLIC (decl
)
1997 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
1998 globalize_decl (decl
);
2000 /* Output any data that we will need to use the address of. */
2001 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2002 output_addressed_constants (DECL_INITIAL (decl
));
2004 /* dbxout.c needs to know this. */
2005 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2006 DECL_IN_TEXT_SECTION (decl
) = 1;
2008 /* If the decl is part of an object_block, make sure that the decl
2009 has been positioned within its block, but do not write out its
2010 definition yet. output_object_blocks will do that later. */
2011 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2013 gcc_assert (!dont_output_data
);
2014 place_block_symbol (symbol
);
2016 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2017 assemble_noswitch_variable (decl
, name
, sect
);
2020 switch_to_section (sect
);
2021 if (DECL_ALIGN (decl
) > BITS_PER_UNIT
)
2022 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (DECL_ALIGN_UNIT (decl
)));
2023 assemble_variable_contents (decl
, name
, dont_output_data
);
2027 /* Return 1 if type TYPE contains any pointers. */
2030 contains_pointers_p (tree type
)
2032 switch (TREE_CODE (type
))
2035 case REFERENCE_TYPE
:
2036 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2037 so I'll play safe and return 1. */
2043 case QUAL_UNION_TYPE
:
2046 /* For a type that has fields, see if the fields have pointers. */
2047 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2048 if (TREE_CODE (fields
) == FIELD_DECL
2049 && contains_pointers_p (TREE_TYPE (fields
)))
2055 /* An array type contains pointers if its element type does. */
2056 return contains_pointers_p (TREE_TYPE (type
));
2063 /* We delay assemble_external processing until
2064 the compilation unit is finalized. This is the best we can do for
2065 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2066 it all the way to final. See PR 17982 for further discussion. */
2067 static GTY(()) tree pending_assemble_externals
;
2069 #ifdef ASM_OUTPUT_EXTERNAL
2070 /* True if DECL is a function decl for which no out-of-line copy exists.
2071 It is assumed that DECL's assembler name has been set. */
2074 incorporeal_function_p (tree decl
)
2076 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2080 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2081 && DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
)
2084 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2085 if (is_builtin_name (name
))
2091 /* Actually do the tests to determine if this is necessary, and invoke
2092 ASM_OUTPUT_EXTERNAL. */
2094 assemble_external_real (tree decl
)
2096 rtx rtl
= DECL_RTL (decl
);
2098 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2099 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2100 && !incorporeal_function_p (decl
))
2102 /* Some systems do require some output. */
2103 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2104 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2110 process_pending_assemble_externals (void)
2112 #ifdef ASM_OUTPUT_EXTERNAL
2114 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2115 assemble_external_real (TREE_VALUE (list
));
2117 pending_assemble_externals
= 0;
2121 /* This TREE_LIST contains any weak symbol declarations waiting
2123 static GTY(()) tree weak_decls
;
2125 /* Output something to declare an external symbol to the assembler,
2126 and qualifiers such as weakness. (Most assemblers don't need
2127 extern declaration, so we normally output nothing.) Do nothing if
2128 DECL is not external. */
2131 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2133 /* Because most platforms do not define ASM_OUTPUT_EXTERNAL, the
2134 main body of this code is only rarely exercised. To provide some
2135 testing, on all platforms, we make sure that the ASM_OUT_FILE is
2136 open. If it's not, we should not be calling this function. */
2137 gcc_assert (asm_out_file
);
2139 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2142 /* We want to output annotation for weak and external symbols at
2143 very last to check if they are references or not. */
2145 if (TARGET_SUPPORTS_WEAK
2147 /* TREE_STATIC is a weird and abused creature which is not
2148 generally the right test for whether an entity has been
2149 locally emitted, inlined or otherwise not-really-extern, but
2150 for declarations that can be weak, it happens to be
2152 && !TREE_STATIC (decl
)
2153 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2154 && value_member (decl
, weak_decls
) == NULL_TREE
)
2155 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2157 #ifdef ASM_OUTPUT_EXTERNAL
2158 if (value_member (decl
, pending_assemble_externals
) == NULL_TREE
)
2159 pending_assemble_externals
= tree_cons (NULL
, decl
,
2160 pending_assemble_externals
);
2164 /* Similar, for calling a library function FUN. */
2167 assemble_external_libcall (rtx fun
)
2169 /* Declare library function name external when first used, if nec. */
2170 if (! SYMBOL_REF_USED (fun
))
2172 SYMBOL_REF_USED (fun
) = 1;
2173 targetm
.asm_out
.external_libcall (fun
);
2177 /* Assemble a label named NAME. */
2180 assemble_label (FILE *file
, const char *name
)
2182 ASM_OUTPUT_LABEL (file
, name
);
2185 /* Set the symbol_referenced flag for ID. */
2187 mark_referenced (tree id
)
2189 TREE_SYMBOL_REFERENCED (id
) = 1;
2192 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2194 mark_decl_referenced (tree decl
)
2196 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2198 /* Extern inline functions don't become needed when referenced.
2199 If we know a method will be emitted in other TU and no new
2200 functions can be marked reachable, just use the external
2202 struct cgraph_node
*node
= cgraph_get_create_node (decl
);
2203 if (!DECL_EXTERNAL (decl
)
2204 && (!node
->local
.vtable_method
|| !cgraph_global_info_ready
2205 || !node
->local
.finalized
))
2206 cgraph_mark_needed_node (node
);
2208 else if (TREE_CODE (decl
) == VAR_DECL
)
2210 struct varpool_node
*node
= varpool_node (decl
);
2211 varpool_mark_needed_node (node
);
2212 /* C++ frontend use mark_decl_references to force COMDAT variables
2213 to be output that might appear dead otherwise. */
2214 node
->force_output
= true;
2216 /* else do nothing - we can get various sorts of CST nodes here,
2217 which do not need to be marked. */
2221 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2222 until we find an identifier that is not itself a transparent alias.
2223 Modify the alias passed to it by reference (and all aliases on the
2224 way to the ultimate target), such that they do not have to be
2225 followed again, and return the ultimate target of the alias
2229 ultimate_transparent_alias_target (tree
*alias
)
2231 tree target
= *alias
;
2233 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
2235 gcc_assert (TREE_CHAIN (target
));
2236 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
2237 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
2238 && ! TREE_CHAIN (target
));
2245 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2246 starts with a *, the rest of NAME is output verbatim. Otherwise
2247 NAME is transformed in a target-specific way (usually by the
2248 addition of an underscore). */
2251 assemble_name_raw (FILE *file
, const char *name
)
2254 fputs (&name
[1], file
);
2256 ASM_OUTPUT_LABELREF (file
, name
);
2259 /* Like assemble_name_raw, but should be used when NAME might refer to
2260 an entity that is also represented as a tree (like a function or
2261 variable). If NAME does refer to such an entity, that entity will
2262 be marked as referenced. */
2265 assemble_name (FILE *file
, const char *name
)
2267 const char *real_name
;
2270 real_name
= targetm
.strip_name_encoding (name
);
2272 id
= maybe_get_identifier (real_name
);
2277 mark_referenced (id
);
2278 ultimate_transparent_alias_target (&id
);
2280 name
= IDENTIFIER_POINTER (id
);
2281 gcc_assert (! TREE_CHAIN (id
));
2284 assemble_name_raw (file
, name
);
2287 /* Allocate SIZE bytes writable static space with a gensym name
2288 and return an RTX to refer to its address. */
2291 assemble_static_space (unsigned HOST_WIDE_INT size
)
2294 const char *namestring
;
2297 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2299 namestring
= ggc_strdup (name
);
2301 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2302 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2304 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2305 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2308 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2309 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2312 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2313 so that each uninitialized object starts on such a boundary. */
2314 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2315 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2316 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2317 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2318 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2319 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2326 /* Assemble the static constant template for function entry trampolines.
2327 This is done at most once per compilation.
2328 Returns an RTX for the address of the template. */
2330 static GTY(()) rtx initial_trampoline
;
2333 assemble_trampoline_template (void)
2340 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2342 if (initial_trampoline
)
2343 return initial_trampoline
;
2345 /* By default, put trampoline templates in read-only data section. */
2347 #ifdef TRAMPOLINE_SECTION
2348 switch_to_section (TRAMPOLINE_SECTION
);
2350 switch_to_section (readonly_data_section
);
2353 /* Write the assembler code to define one. */
2354 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2356 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2358 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2359 targetm
.asm_out
.trampoline_template (asm_out_file
);
2361 /* Record the rtl to refer to it. */
2362 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2363 name
= ggc_strdup (label
);
2364 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2365 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2367 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2368 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2369 set_mem_size (initial_trampoline
, GEN_INT (TRAMPOLINE_SIZE
));
2371 return initial_trampoline
;
2374 /* A and B are either alignments or offsets. Return the minimum alignment
2375 that may be assumed after adding the two together. */
2377 static inline unsigned
2378 min_align (unsigned int a
, unsigned int b
)
2380 return (a
| b
) & -(a
| b
);
2383 /* Return the assembler directive for creating a given kind of integer
2384 object. SIZE is the number of bytes in the object and ALIGNED_P
2385 indicates whether it is known to be aligned. Return NULL if the
2386 assembly dialect has no such directive.
2388 The returned string should be printed at the start of a new line and
2389 be followed immediately by the object's initial value. */
2392 integer_asm_op (int size
, int aligned_p
)
2394 struct asm_int_op
*ops
;
2397 ops
= &targetm
.asm_out
.aligned_op
;
2399 ops
= &targetm
.asm_out
.unaligned_op
;
2404 return targetm
.asm_out
.byte_op
;
2418 /* Use directive OP to assemble an integer object X. Print OP at the
2419 start of the line, followed immediately by the value of X. */
2422 assemble_integer_with_op (const char *op
, rtx x
)
2424 fputs (op
, asm_out_file
);
2425 output_addr_const (asm_out_file
, x
);
2426 fputc ('\n', asm_out_file
);
2429 /* The default implementation of the asm_out.integer target hook. */
2432 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2433 unsigned int size ATTRIBUTE_UNUSED
,
2434 int aligned_p ATTRIBUTE_UNUSED
)
2436 const char *op
= integer_asm_op (size
, aligned_p
);
2437 /* Avoid GAS bugs for large values. Specifically negative values whose
2438 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2439 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE
/ BITS_PER_UNIT
)
2441 return op
&& (assemble_integer_with_op (op
, x
), true);
2444 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2445 the alignment of the integer in bits. Return 1 if we were able to output
2446 the constant, otherwise 0. We must be able to output the constant,
2447 if FORCE is nonzero. */
2450 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2454 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2456 /* See if the target hook can handle this kind of object. */
2457 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2460 /* If the object is a multi-byte one, try splitting it up. Split
2461 it into words it if is multi-word, otherwise split it into bytes. */
2464 enum machine_mode omode
, imode
;
2465 unsigned int subalign
;
2466 unsigned int subsize
, i
;
2467 enum mode_class mclass
;
2469 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2470 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2471 if (GET_CODE (x
) == CONST_FIXED
)
2472 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2476 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2477 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2479 for (i
= 0; i
< size
; i
+= subsize
)
2481 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2482 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2488 /* If we've printed some of it, but not all of it, there's no going
2493 gcc_assert (!force
);
2499 assemble_real (REAL_VALUE_TYPE d
, enum machine_mode mode
, unsigned int align
)
2501 long data
[4] = {0, 0, 0, 0};
2503 int bitsize
, nelts
, nunits
, units_per
;
2505 /* This is hairy. We have a quantity of known size. real_to_target
2506 will put it into an array of *host* longs, 32 bits per element
2507 (even if long is more than 32 bits). We need to determine the
2508 number of array elements that are occupied (nelts) and the number
2509 of *target* min-addressable units that will be occupied in the
2510 object file (nunits). We cannot assume that 32 divides the
2511 mode's bitsize (size * BITS_PER_UNIT) evenly.
2513 size * BITS_PER_UNIT is used here to make sure that padding bits
2514 (which might appear at either end of the value; real_to_target
2515 will include the padding bits in its output array) are included. */
2517 nunits
= GET_MODE_SIZE (mode
);
2518 bitsize
= nunits
* BITS_PER_UNIT
;
2519 nelts
= CEIL (bitsize
, 32);
2520 units_per
= 32 / BITS_PER_UNIT
;
2522 real_to_target (data
, &d
, mode
);
2524 /* Put out the first word with the specified alignment. */
2525 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2526 nunits
-= units_per
;
2528 /* Subsequent words need only 32-bit alignment. */
2529 align
= min_align (align
, 32);
2531 for (i
= 1; i
< nelts
; i
++)
2533 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2534 nunits
-= units_per
;
2538 /* Given an expression EXP with a constant value,
2539 reduce it to the sum of an assembler symbol and an integer.
2540 Store them both in the structure *VALUE.
2541 EXP must be reducible. */
2545 HOST_WIDE_INT offset
;
2549 decode_addr_const (tree exp
, struct addr_const
*value
)
2551 tree target
= TREE_OPERAND (exp
, 0);
2557 if (TREE_CODE (target
) == COMPONENT_REF
2558 && host_integerp (byte_position (TREE_OPERAND (target
, 1)), 0))
2560 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2561 target
= TREE_OPERAND (target
, 0);
2563 else if (TREE_CODE (target
) == ARRAY_REF
2564 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2566 offset
+= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target
)), 1)
2567 * tree_low_cst (TREE_OPERAND (target
, 1), 0));
2568 target
= TREE_OPERAND (target
, 0);
2570 else if (TREE_CODE (target
) == INDIRECT_REF
2571 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2572 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2574 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2579 switch (TREE_CODE (target
))
2583 x
= DECL_RTL (target
);
2587 x
= gen_rtx_MEM (FUNCTION_MODE
,
2588 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2597 x
= output_constant_def (target
, 1);
2604 gcc_assert (MEM_P (x
));
2608 value
->offset
= offset
;
2612 static GTY((param_is (struct constant_descriptor_tree
)))
2613 htab_t const_desc_htab
;
2615 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2617 /* Constant pool accessor function. */
2620 constant_pool_htab (void)
2622 return const_desc_htab
;
2625 /* Compute a hash code for a constant expression. */
2628 const_desc_hash (const void *ptr
)
2630 return ((const struct constant_descriptor_tree
*)ptr
)->hash
;
2634 const_hash_1 (const tree exp
)
2639 enum tree_code code
= TREE_CODE (exp
);
2641 /* Either set P and LEN to the address and len of something to hash and
2642 exit the switch or return a value. */
2647 p
= (char *) &TREE_INT_CST (exp
);
2648 len
= sizeof TREE_INT_CST (exp
);
2652 return real_hash (TREE_REAL_CST_PTR (exp
));
2655 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2658 p
= TREE_STRING_POINTER (exp
);
2659 len
= TREE_STRING_LENGTH (exp
);
2663 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2664 + const_hash_1 (TREE_IMAGPART (exp
)));
2670 hi
= 7 + TYPE_VECTOR_SUBPARTS (TREE_TYPE (exp
));
2672 for (link
= TREE_VECTOR_CST_ELTS (exp
); link
; link
= TREE_CHAIN (link
))
2673 hi
= hi
* 563 + const_hash_1 (TREE_VALUE (link
));
2680 unsigned HOST_WIDE_INT idx
;
2683 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2685 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2687 hi
= hi
* 603 + const_hash_1 (value
);
2695 struct addr_const value
;
2697 decode_addr_const (exp
, &value
);
2698 switch (GET_CODE (value
.base
))
2701 /* Don't hash the address of the SYMBOL_REF;
2702 only use the offset and the symbol name. */
2704 p
= XSTR (value
.base
, 0);
2705 for (i
= 0; p
[i
] != 0; i
++)
2706 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2710 hi
= value
.offset
+ CODE_LABEL_NUMBER (XEXP (value
.base
, 0)) * 13;
2720 case POINTER_PLUS_EXPR
:
2722 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2723 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2726 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2729 /* A language specific constant. Just hash the code. */
2733 /* Compute hashing function. */
2735 for (i
= 0; i
< len
; i
++)
2736 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2741 /* Wrapper of compare_constant, for the htab interface. */
2743 const_desc_eq (const void *p1
, const void *p2
)
2745 const struct constant_descriptor_tree
*const c1
2746 = (const struct constant_descriptor_tree
*) p1
;
2747 const struct constant_descriptor_tree
*const c2
2748 = (const struct constant_descriptor_tree
*) p2
;
2749 if (c1
->hash
!= c2
->hash
)
2751 return compare_constant (c1
->value
, c2
->value
);
2754 /* Compare t1 and t2, and return 1 only if they are known to result in
2755 the same bit pattern on output. */
2758 compare_constant (const tree t1
, const tree t2
)
2760 enum tree_code typecode
;
2762 if (t1
== NULL_TREE
)
2763 return t2
== NULL_TREE
;
2764 if (t2
== NULL_TREE
)
2767 if (TREE_CODE (t1
) != TREE_CODE (t2
))
2770 switch (TREE_CODE (t1
))
2773 /* Integer constants are the same only if the same width of type. */
2774 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2776 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2778 return tree_int_cst_equal (t1
, t2
);
2781 /* Real constants are the same only if the same width of type. */
2782 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2785 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
2788 /* Fixed constants are the same only if the same width of type. */
2789 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2792 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
2795 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2798 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
2799 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
2800 TREE_STRING_LENGTH (t1
)));
2803 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
2804 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
2810 if (TYPE_VECTOR_SUBPARTS (TREE_TYPE (t1
))
2811 != TYPE_VECTOR_SUBPARTS (TREE_TYPE (t2
)))
2814 link2
= TREE_VECTOR_CST_ELTS (t2
);
2815 for (link1
= TREE_VECTOR_CST_ELTS (t1
);
2817 link1
= TREE_CHAIN (link1
))
2819 if (!compare_constant (TREE_VALUE (link1
), TREE_VALUE (link2
)))
2821 link2
= TREE_CHAIN (link2
);
2829 VEC(constructor_elt
, gc
) *v1
, *v2
;
2830 unsigned HOST_WIDE_INT idx
;
2832 typecode
= TREE_CODE (TREE_TYPE (t1
));
2833 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
2836 if (typecode
== ARRAY_TYPE
)
2838 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
2839 /* For arrays, check that the sizes all match. */
2840 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
2842 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
2847 /* For record and union constructors, require exact type
2849 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
2853 v1
= CONSTRUCTOR_ELTS (t1
);
2854 v2
= CONSTRUCTOR_ELTS (t2
);
2855 if (VEC_length (constructor_elt
, v1
)
2856 != VEC_length (constructor_elt
, v2
))
2859 for (idx
= 0; idx
< VEC_length (constructor_elt
, v1
); ++idx
)
2861 constructor_elt
*c1
= VEC_index (constructor_elt
, v1
, idx
);
2862 constructor_elt
*c2
= VEC_index (constructor_elt
, v2
, idx
);
2864 /* Check that each value is the same... */
2865 if (!compare_constant (c1
->value
, c2
->value
))
2867 /* ... and that they apply to the same fields! */
2868 if (typecode
== ARRAY_TYPE
)
2870 if (!compare_constant (c1
->index
, c2
->index
))
2875 if (c1
->index
!= c2
->index
)
2886 struct addr_const value1
, value2
;
2890 decode_addr_const (t1
, &value1
);
2891 decode_addr_const (t2
, &value2
);
2893 if (value1
.offset
!= value2
.offset
)
2896 code
= GET_CODE (value1
.base
);
2897 if (code
!= GET_CODE (value2
.base
))
2903 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
2907 ret
= (CODE_LABEL_NUMBER (XEXP (value1
.base
, 0))
2908 == CODE_LABEL_NUMBER (XEXP (value2
.base
, 0)));
2918 case POINTER_PLUS_EXPR
:
2921 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
2922 && compare_constant(TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
2925 case VIEW_CONVERT_EXPR
:
2926 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
2935 /* Make a copy of the whole tree structure for a constant. This
2936 handles the same types of nodes that compare_constant handles. */
2939 copy_constant (tree exp
)
2941 switch (TREE_CODE (exp
))
2944 /* For ADDR_EXPR, we do not want to copy the decl whose address
2945 is requested. We do want to copy constants though. */
2946 if (CONSTANT_CLASS_P (TREE_OPERAND (exp
, 0)))
2947 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
2948 copy_constant (TREE_OPERAND (exp
, 0)));
2950 return copy_node (exp
);
2956 return copy_node (exp
);
2959 return build_complex (TREE_TYPE (exp
),
2960 copy_constant (TREE_REALPART (exp
)),
2961 copy_constant (TREE_IMAGPART (exp
)));
2964 case POINTER_PLUS_EXPR
:
2966 return build2 (TREE_CODE (exp
), TREE_TYPE (exp
),
2967 copy_constant (TREE_OPERAND (exp
, 0)),
2968 copy_constant (TREE_OPERAND (exp
, 1)));
2971 case VIEW_CONVERT_EXPR
:
2972 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
2973 copy_constant (TREE_OPERAND (exp
, 0)));
2976 return build_vector (TREE_TYPE (exp
),
2977 copy_list (TREE_VECTOR_CST_ELTS (exp
)));
2981 tree copy
= copy_node (exp
);
2982 VEC(constructor_elt
, gc
) *v
;
2983 unsigned HOST_WIDE_INT idx
;
2984 tree purpose
, value
;
2986 v
= VEC_alloc(constructor_elt
, gc
, VEC_length(constructor_elt
,
2987 CONSTRUCTOR_ELTS (exp
)));
2988 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp
), idx
, purpose
, value
)
2990 constructor_elt
*ce
= VEC_quick_push (constructor_elt
, v
, NULL
);
2991 ce
->index
= purpose
;
2992 ce
->value
= copy_constant (value
);
2994 CONSTRUCTOR_ELTS (copy
) = v
;
3003 /* Return the section into which constant EXP should be placed. */
3006 get_constant_section (tree exp
, unsigned int align
)
3008 return targetm
.asm_out
.select_section (exp
,
3009 compute_reloc_for_constant (exp
),
3013 /* Return the size of constant EXP in bytes. */
3015 static HOST_WIDE_INT
3016 get_constant_size (tree exp
)
3020 size
= int_size_in_bytes (TREE_TYPE (exp
));
3021 if (TREE_CODE (exp
) == STRING_CST
)
3022 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3026 /* Subroutine of output_constant_def:
3027 No constant equal to EXP is known to have been output.
3028 Make a constant descriptor to enter EXP in the hash table.
3029 Assign the label number and construct RTL to refer to the
3030 constant's location in memory.
3031 Caller is responsible for updating the hash table. */
3033 static struct constant_descriptor_tree
*
3034 build_constant_desc (tree exp
)
3036 struct constant_descriptor_tree
*desc
;
3042 desc
= ggc_alloc_constant_descriptor_tree ();
3043 desc
->value
= copy_constant (exp
);
3045 /* Propagate marked-ness to copied constant. */
3046 if (flag_mudflap
&& mf_marked_p (exp
))
3047 mf_mark (desc
->value
);
3049 /* Create a string containing the label name, in LABEL. */
3050 labelno
= const_labelno
++;
3051 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3053 /* Construct the VAR_DECL associated with the constant. */
3054 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3056 DECL_ARTIFICIAL (decl
) = 1;
3057 DECL_IGNORED_P (decl
) = 1;
3058 TREE_READONLY (decl
) = 1;
3059 TREE_STATIC (decl
) = 1;
3060 TREE_ADDRESSABLE (decl
) = 1;
3061 /* We don't set the RTL yet as this would cause varpool to assume that the
3062 variable is referenced. Moreover, it would just be dropped in LTO mode.
3063 Instead we set the flag that will be recognized in make_decl_rtl. */
3064 DECL_IN_CONSTANT_POOL (decl
) = 1;
3065 DECL_INITIAL (decl
) = desc
->value
;
3066 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3067 architectures so use DATA_ALIGNMENT as well, except for strings. */
3068 if (TREE_CODE (exp
) == STRING_CST
)
3070 #ifdef CONSTANT_ALIGNMENT
3071 DECL_ALIGN (decl
) = CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
));
3075 align_variable (decl
, 0);
3077 /* Now construct the SYMBOL_REF and the MEM. */
3078 if (use_object_blocks_p ())
3080 section
*sect
= get_constant_section (exp
, DECL_ALIGN (decl
));
3081 symbol
= create_block_symbol (ggc_strdup (label
),
3082 get_block_for_section (sect
), -1);
3085 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3086 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3087 SET_SYMBOL_REF_DECL (symbol
, decl
);
3088 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3090 rtl
= gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3091 set_mem_attributes (rtl
, exp
, 1);
3092 set_mem_alias_set (rtl
, 0);
3093 set_mem_alias_set (rtl
, const_alias_set
);
3095 /* We cannot share RTX'es in pool entries.
3096 Mark this piece of RTL as required for unsharing. */
3097 RTX_FLAG (rtl
, used
) = 1;
3099 /* Set flags or add text to the name to record information, such as
3100 that it is a local symbol. If the name is changed, the macro
3101 ASM_OUTPUT_LABELREF will have to know how to strip this
3102 information. This call might invalidate our local variable
3103 SYMBOL; we can't use it afterward. */
3104 targetm
.encode_section_info (exp
, rtl
, true);
3111 /* Return an rtx representing a reference to constant data in memory
3112 for the constant expression EXP.
3114 If assembler code for such a constant has already been output,
3115 return an rtx to refer to it.
3116 Otherwise, output such a constant in memory
3117 and generate an rtx for it.
3119 If DEFER is nonzero, this constant can be deferred and output only
3120 if referenced in the function after all optimizations.
3122 `const_desc_table' records which constants already have label strings. */
3125 output_constant_def (tree exp
, int defer
)
3127 struct constant_descriptor_tree
*desc
;
3128 struct constant_descriptor_tree key
;
3131 /* Look up EXP in the table of constant descriptors. If we didn't find
3132 it, create a new one. */
3134 key
.hash
= const_hash_1 (exp
);
3135 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3137 desc
= (struct constant_descriptor_tree
*) *loc
;
3140 desc
= build_constant_desc (exp
);
3141 desc
->hash
= key
.hash
;
3145 maybe_output_constant_def_contents (desc
, defer
);
3149 /* Subroutine of output_constant_def: Decide whether or not we need to
3150 output the constant DESC now, and if so, do it. */
3152 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3155 rtx symbol
= XEXP (desc
->rtl
, 0);
3156 tree exp
= desc
->value
;
3158 if (flag_syntax_only
)
3161 if (TREE_ASM_WRITTEN (exp
))
3162 /* Already output; don't do it again. */
3165 /* We can always defer constants as long as the context allows
3169 /* Increment n_deferred_constants if it exists. It needs to be at
3170 least as large as the number of constants actually referred to
3171 by the function. If it's too small we'll stop looking too early
3172 and fail to emit constants; if it's too large we'll only look
3173 through the entire function when we could have stopped earlier. */
3175 n_deferred_constants
++;
3179 output_constant_def_contents (symbol
);
3182 /* Subroutine of output_constant_def_contents. Output the definition
3183 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3184 constant's alignment in bits. */
3187 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3191 size
= get_constant_size (exp
);
3193 /* Do any machine/system dependent processing of the constant. */
3194 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3196 /* Output the value of EXP. */
3197 output_constant (exp
, size
, align
);
3200 /* We must output the constant data referred to by SYMBOL; do so. */
3203 output_constant_def_contents (rtx symbol
)
3205 tree decl
= SYMBOL_REF_DECL (symbol
);
3206 tree exp
= DECL_INITIAL (decl
);
3209 /* Make sure any other constants whose addresses appear in EXP
3210 are assigned label numbers. */
3211 output_addressed_constants (exp
);
3213 /* We are no longer deferring this constant. */
3214 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3216 /* If the constant is part of an object block, make sure that the
3217 decl has been positioned within its block, but do not write out
3218 its definition yet. output_object_blocks will do that later. */
3219 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3220 place_block_symbol (symbol
);
3223 align
= DECL_ALIGN (decl
);
3224 switch_to_section (get_constant_section (exp
, align
));
3225 if (align
> BITS_PER_UNIT
)
3226 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3227 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3230 mudflap_enqueue_constant (exp
);
3233 /* Look up EXP in the table of constant descriptors. Return the rtl
3234 if it has been emitted, else null. */
3237 lookup_constant_def (tree exp
)
3239 struct constant_descriptor_tree
*desc
;
3240 struct constant_descriptor_tree key
;
3243 key
.hash
= const_hash_1 (exp
);
3244 desc
= (struct constant_descriptor_tree
*)
3245 htab_find_with_hash (const_desc_htab
, &key
, key
.hash
);
3247 return (desc
? desc
->rtl
: NULL_RTX
);
3250 /* Return a tree representing a reference to constant data in memory
3251 for the constant expression EXP.
3253 This is the counterpart of output_constant_def at the Tree level. */
3256 tree_output_constant_def (tree exp
)
3258 struct constant_descriptor_tree
*desc
, key
;
3262 /* Look up EXP in the table of constant descriptors. If we didn't find
3263 it, create a new one. */
3265 key
.hash
= const_hash_1 (exp
);
3266 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3268 desc
= (struct constant_descriptor_tree
*) *loc
;
3271 desc
= build_constant_desc (exp
);
3272 desc
->hash
= key
.hash
;
3276 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3277 varpool_finalize_decl (decl
);
3281 /* Used in the hash tables to avoid outputting the same constant
3282 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3283 are output once per function, not once per file. */
3284 /* ??? Only a few targets need per-function constant pools. Most
3285 can use one per-file pool. Should add a targetm bit to tell the
3288 struct GTY(()) rtx_constant_pool
{
3289 /* Pointers to first and last constant in pool, as ordered by offset. */
3290 struct constant_descriptor_rtx
*first
;
3291 struct constant_descriptor_rtx
*last
;
3293 /* Hash facility for making memory-constants from constant rtl-expressions.
3294 It is used on RISC machines where immediate integer arguments and
3295 constant addresses are restricted so that such constants must be stored
3297 htab_t
GTY((param_is (struct constant_descriptor_rtx
))) const_rtx_htab
;
3299 /* Current offset in constant pool (does not include any
3300 machine-specific header). */
3301 HOST_WIDE_INT offset
;
3304 struct GTY((chain_next ("%h.next"))) constant_descriptor_rtx
{
3305 struct constant_descriptor_rtx
*next
;
3309 HOST_WIDE_INT offset
;
3311 enum machine_mode mode
;
3317 /* Hash and compare functions for const_rtx_htab. */
3320 const_desc_rtx_hash (const void *ptr
)
3322 const struct constant_descriptor_rtx
*const desc
3323 = (const struct constant_descriptor_rtx
*) ptr
;
3328 const_desc_rtx_eq (const void *a
, const void *b
)
3330 const struct constant_descriptor_rtx
*const x
3331 = (const struct constant_descriptor_rtx
*) a
;
3332 const struct constant_descriptor_rtx
*const y
3333 = (const struct constant_descriptor_rtx
*) b
;
3335 if (x
->mode
!= y
->mode
)
3337 return rtx_equal_p (x
->constant
, y
->constant
);
3340 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3343 const_rtx_hash_1 (rtx
*xp
, void *data
)
3345 unsigned HOST_WIDE_INT hwi
;
3346 enum machine_mode mode
;
3352 code
= GET_CODE (x
);
3353 mode
= GET_MODE (x
);
3354 h
= (hashval_t
) code
* 1048573 + mode
;
3362 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3363 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3366 h
^= (hashval_t
) hwi
;
3367 for (i
= 1; i
< n
; ++i
)
3370 h
^= (hashval_t
) hwi
;
3376 if (mode
== VOIDmode
)
3378 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3382 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3386 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3392 for (i
= XVECLEN (x
, 0); i
-- > 0; )
3393 h
= h
* 251 + const_rtx_hash_1 (&XVECEXP (x
, 0, i
), data
);
3398 h
^= htab_hash_string (XSTR (x
, 0));
3402 h
= h
* 251 + CODE_LABEL_NUMBER (XEXP (x
, 0));
3406 case UNSPEC_VOLATILE
:
3407 h
= h
* 251 + XINT (x
, 1);
3414 hp
= (hashval_t
*) data
;
3415 *hp
= *hp
* 509 + h
;
3419 /* Compute a hash value for X, which should be a constant. */
3422 const_rtx_hash (rtx x
)
3425 for_each_rtx (&x
, const_rtx_hash_1
, &h
);
3430 /* Create and return a new rtx constant pool. */
3432 static struct rtx_constant_pool
*
3433 create_constant_pool (void)
3435 struct rtx_constant_pool
*pool
;
3437 pool
= ggc_alloc_rtx_constant_pool ();
3438 pool
->const_rtx_htab
= htab_create_ggc (31, const_desc_rtx_hash
,
3439 const_desc_rtx_eq
, NULL
);
3446 /* Initialize constant pool hashing for a new function. */
3449 init_varasm_status (void)
3451 crtl
->varasm
.pool
= create_constant_pool ();
3452 crtl
->varasm
.deferred_constants
= 0;
3455 /* Given a MINUS expression, simplify it if both sides
3456 include the same symbol. */
3459 simplify_subtraction (rtx x
)
3461 rtx r
= simplify_rtx (x
);
3465 /* Given a constant rtx X, make (or find) a memory constant for its value
3466 and return a MEM rtx to refer to it in memory. */
3469 force_const_mem (enum machine_mode mode
, rtx x
)
3471 struct constant_descriptor_rtx
*desc
, tmp
;
3472 struct rtx_constant_pool
*pool
;
3479 /* If we're not allowed to drop X into the constant pool, don't. */
3480 if (targetm
.cannot_force_const_mem (x
))
3483 /* Record that this function has used a constant pool entry. */
3484 crtl
->uses_const_pool
= 1;
3486 /* Decide which pool to use. */
3487 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3488 ? shared_constant_pool
3489 : crtl
->varasm
.pool
);
3491 /* Lookup the value in the hashtable. */
3494 hash
= const_rtx_hash (x
);
3495 slot
= htab_find_slot_with_hash (pool
->const_rtx_htab
, &tmp
, hash
, INSERT
);
3496 desc
= (struct constant_descriptor_rtx
*) *slot
;
3498 /* If the constant was already present, return its memory. */
3500 return copy_rtx (desc
->mem
);
3502 /* Otherwise, create a new descriptor. */
3503 desc
= ggc_alloc_constant_descriptor_rtx ();
3506 /* Align the location counter as required by EXP's data type. */
3507 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3508 #ifdef CONSTANT_ALIGNMENT
3510 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3511 if (type
!= NULL_TREE
)
3512 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3516 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3517 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3520 desc
->constant
= copy_rtx (tmp
.constant
);
3521 desc
->offset
= pool
->offset
;
3524 desc
->align
= align
;
3525 desc
->labelno
= const_labelno
;
3528 pool
->offset
+= GET_MODE_SIZE (mode
);
3530 pool
->last
->next
= desc
;
3532 pool
->first
= pool
->last
= desc
;
3535 /* Create a string containing the label name, in LABEL. */
3536 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3539 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3540 the constants pool. */
3541 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3543 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3544 symbol
= create_block_symbol (ggc_strdup (label
),
3545 get_block_for_section (sect
), -1);
3548 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3550 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3551 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3552 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3554 /* Construct the MEM. */
3555 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3556 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3557 set_mem_align (def
, align
);
3559 /* If we're dropping a label to the constant pool, make sure we
3561 if (GET_CODE (x
) == LABEL_REF
)
3562 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3564 return copy_rtx (def
);
3567 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3570 get_pool_constant (rtx addr
)
3572 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3575 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3576 and whether it has been output or not. */
3579 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3581 struct constant_descriptor_rtx
*desc
;
3583 desc
= SYMBOL_REF_CONSTANT (addr
);
3584 *pmarked
= (desc
->mark
!= 0);
3585 return desc
->constant
;
3588 /* Similar, return the mode. */
3591 get_pool_mode (const_rtx addr
)
3593 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3596 /* Return the size of the constant pool. */
3599 get_pool_size (void)
3601 return crtl
->varasm
.pool
->offset
;
3604 /* Worker function for output_constant_pool_1. Emit assembly for X
3605 in MODE with known alignment ALIGN. */
3608 output_constant_pool_2 (enum machine_mode mode
, rtx x
, unsigned int align
)
3610 switch (GET_MODE_CLASS (mode
))
3613 case MODE_DECIMAL_FLOAT
:
3617 gcc_assert (GET_CODE (x
) == CONST_DOUBLE
);
3618 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3619 assemble_real (r
, mode
, align
);
3624 case MODE_PARTIAL_INT
:
3629 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3632 case MODE_VECTOR_FLOAT
:
3633 case MODE_VECTOR_INT
:
3634 case MODE_VECTOR_FRACT
:
3635 case MODE_VECTOR_UFRACT
:
3636 case MODE_VECTOR_ACCUM
:
3637 case MODE_VECTOR_UACCUM
:
3640 enum machine_mode submode
= GET_MODE_INNER (mode
);
3641 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3643 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3644 units
= CONST_VECTOR_NUNITS (x
);
3646 for (i
= 0; i
< units
; i
++)
3648 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3649 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3659 /* Worker function for output_constant_pool. Emit constant DESC,
3660 giving it ALIGN bits of alignment. */
3663 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3670 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3671 whose CODE_LABEL has been deleted. This can occur if a jump table
3672 is eliminated by optimization. If so, write a constant of zero
3673 instead. Note that this can also happen by turning the
3674 CODE_LABEL into a NOTE. */
3675 /* ??? This seems completely and utterly wrong. Certainly it's
3676 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3677 functioning even with INSN_DELETED_P and friends. */
3680 switch (GET_CODE (tmp
))
3683 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3684 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3686 tmp
= XEXP (XEXP (tmp
, 0), 0);
3690 tmp
= XEXP (tmp
, 0);
3691 gcc_assert (!INSN_DELETED_P (tmp
));
3692 gcc_assert (!NOTE_P (tmp
)
3693 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3700 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3701 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3702 align
, desc
->labelno
, done
);
3705 assemble_align (align
);
3707 /* Output the label. */
3708 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3710 /* Output the data. */
3711 output_constant_pool_2 (desc
->mode
, x
, align
);
3713 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3714 sections have proper size. */
3715 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3717 && (in_section
->common
.flags
& SECTION_MERGE
))
3718 assemble_align (align
);
3720 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3726 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3727 to as used. Emit referenced deferred strings. This function can
3728 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3731 mark_constant (rtx
*current_rtx
, void *data ATTRIBUTE_UNUSED
)
3733 rtx x
= *current_rtx
;
3735 if (x
== NULL_RTX
|| GET_CODE (x
) != SYMBOL_REF
)
3738 if (CONSTANT_POOL_ADDRESS_P (x
))
3740 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3741 if (desc
->mark
== 0)
3744 for_each_rtx (&desc
->constant
, mark_constant
, NULL
);
3747 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3749 tree decl
= SYMBOL_REF_DECL (x
);
3750 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
3752 n_deferred_constants
--;
3753 output_constant_def_contents (x
);
3760 /* Look through appropriate parts of INSN, marking all entries in the
3761 constant pool which are actually being used. Entries that are only
3762 referenced by other constants are also marked as used. Emit
3763 deferred strings that are used. */
3766 mark_constants (rtx insn
)
3771 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3772 insns, not any notes that may be attached. We don't want to mark
3773 a constant just because it happens to appear in a REG_EQUIV note. */
3774 if (GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3776 rtx seq
= PATTERN (insn
);
3777 int i
, n
= XVECLEN (seq
, 0);
3778 for (i
= 0; i
< n
; ++i
)
3780 rtx subinsn
= XVECEXP (seq
, 0, i
);
3781 if (INSN_P (subinsn
))
3782 for_each_rtx (&PATTERN (subinsn
), mark_constant
, NULL
);
3786 for_each_rtx (&PATTERN (insn
), mark_constant
, NULL
);
3789 /* Look through the instructions for this function, and mark all the
3790 entries in POOL which are actually being used. Emit deferred constants
3791 which have indeed been used. */
3794 mark_constant_pool (void)
3798 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
3801 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3802 mark_constants (insn
);
3804 for (link
= crtl
->epilogue_delay_list
;
3806 link
= XEXP (link
, 1))
3807 mark_constants (XEXP (link
, 0));
3810 /* Write all the constants in POOL. */
3813 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
3815 struct constant_descriptor_rtx
*desc
;
3817 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3820 /* If the constant is part of an object_block, make sure that
3821 the constant has been positioned within its block, but do not
3822 write out its definition yet. output_object_blocks will do
3824 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
3825 && SYMBOL_REF_BLOCK (desc
->sym
))
3826 place_block_symbol (desc
->sym
);
3829 switch_to_section (targetm
.asm_out
.select_rtx_section
3830 (desc
->mode
, desc
->constant
, desc
->align
));
3831 output_constant_pool_1 (desc
, desc
->align
);
3836 /* Mark all constants that are used in the current function, then write
3837 out the function's private constant pool. */
3840 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
3841 tree fndecl ATTRIBUTE_UNUSED
)
3843 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
3845 /* It is possible for gcc to call force_const_mem and then to later
3846 discard the instructions which refer to the constant. In such a
3847 case we do not need to output the constant. */
3848 mark_constant_pool ();
3850 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3851 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3854 output_constant_pool_contents (pool
);
3856 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3857 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3861 /* Write the contents of the shared constant pool. */
3864 output_shared_constant_pool (void)
3866 output_constant_pool_contents (shared_constant_pool
);
3869 /* Determine what kind of relocations EXP may need. */
3872 compute_reloc_for_constant (tree exp
)
3874 int reloc
= 0, reloc2
;
3877 switch (TREE_CODE (exp
))
3881 /* Go inside any operations that get_inner_reference can handle and see
3882 if what's inside is a constant: no need to do anything here for
3883 addresses of variables or functions. */
3884 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3885 tem
= TREE_OPERAND (tem
, 0))
3888 if (TREE_PUBLIC (tem
))
3895 case POINTER_PLUS_EXPR
:
3896 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3897 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3901 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3902 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3903 /* The difference of two local labels is computable at link time. */
3904 if (reloc
== 1 && reloc2
== 1)
3911 case VIEW_CONVERT_EXPR
:
3912 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3917 unsigned HOST_WIDE_INT idx
;
3918 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
3920 reloc
|= compute_reloc_for_constant (tem
);
3930 /* Find all the constants whose addresses are referenced inside of EXP,
3931 and make sure assembler code with a label has been output for each one.
3932 Indicate whether an ADDR_EXPR has been encountered. */
3935 output_addressed_constants (tree exp
)
3939 switch (TREE_CODE (exp
))
3943 /* Go inside any operations that get_inner_reference can handle and see
3944 if what's inside is a constant: no need to do anything here for
3945 addresses of variables or functions. */
3946 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3947 tem
= TREE_OPERAND (tem
, 0))
3950 /* If we have an initialized CONST_DECL, retrieve the initializer. */
3951 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
3952 tem
= DECL_INITIAL (tem
);
3954 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
3955 output_constant_def (tem
, 0);
3959 case POINTER_PLUS_EXPR
:
3961 output_addressed_constants (TREE_OPERAND (exp
, 1));
3965 case VIEW_CONVERT_EXPR
:
3966 output_addressed_constants (TREE_OPERAND (exp
, 0));
3971 unsigned HOST_WIDE_INT idx
;
3972 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
3974 output_addressed_constants (tem
);
3983 /* Whether a constructor CTOR is a valid static constant initializer if all
3984 its elements are. This used to be internal to initializer_constant_valid_p
3985 and has been exposed to let other functions like categorize_ctor_elements
3986 evaluate the property while walking a constructor for other purposes. */
3989 constructor_static_from_elts_p (const_tree ctor
)
3991 return (TREE_CONSTANT (ctor
)
3992 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
3993 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
3994 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
3997 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4000 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4001 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4002 which are valid when ENDTYPE is an integer of any size; in
4003 particular, this does not accept a pointer minus a constant. This
4004 returns null_pointer_node if the VALUE is an absolute constant
4005 which can be used to initialize a static variable. Otherwise it
4009 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4013 if (!INTEGRAL_TYPE_P (endtype
))
4016 op0
= TREE_OPERAND (value
, 0);
4017 op1
= TREE_OPERAND (value
, 1);
4019 /* Like STRIP_NOPS except allow the operand mode to widen. This
4020 works around a feature of fold that simplifies (int)(p1 - p2) to
4021 ((int)p1 - (int)p2) under the theory that the narrower operation
4024 while (CONVERT_EXPR_P (op0
)
4025 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4027 tree inner
= TREE_OPERAND (op0
, 0);
4028 if (inner
== error_mark_node
4029 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4030 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4031 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4036 while (CONVERT_EXPR_P (op1
)
4037 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4039 tree inner
= TREE_OPERAND (op1
, 0);
4040 if (inner
== error_mark_node
4041 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4042 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4043 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4048 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4052 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4053 cache
? cache
+ 2 : NULL
);
4054 /* Both initializers must be known. */
4058 && (op0
== null_pointer_node
4059 || TREE_CODE (value
) == MINUS_EXPR
))
4060 return null_pointer_node
;
4062 /* Support differences between labels. */
4063 if (TREE_CODE (op0
) == LABEL_DECL
4064 && TREE_CODE (op1
) == LABEL_DECL
)
4065 return null_pointer_node
;
4067 if (TREE_CODE (op0
) == STRING_CST
4068 && TREE_CODE (op1
) == STRING_CST
4069 && operand_equal_p (op0
, op1
, 1))
4070 return null_pointer_node
;
4076 /* Helper function of initializer_constant_valid_p.
4077 Return nonzero if VALUE is a valid constant-valued expression
4078 for use in initializing a static variable; one that can be an
4079 element of a "constant" initializer.
4081 Return null_pointer_node if the value is absolute;
4082 if it is relocatable, return the variable that determines the relocation.
4083 We assume that VALUE has been folded as much as possible;
4084 therefore, we do not need to check for such things as
4085 arithmetic-combinations of integers.
4087 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4090 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4094 switch (TREE_CODE (value
))
4097 if (constructor_static_from_elts_p (value
))
4099 unsigned HOST_WIDE_INT idx
;
4101 bool absolute
= true;
4103 if (cache
&& cache
[0] == value
)
4105 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4108 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4115 cache
[1] = NULL_TREE
;
4119 if (reloc
!= null_pointer_node
)
4122 /* For a non-absolute relocation, there is no single
4123 variable that can be "the variable that determines the
4128 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4130 return absolute
? null_pointer_node
: error_mark_node
;
4133 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4141 return null_pointer_node
;
4146 tree op0
= staticp (TREE_OPERAND (value
, 0));
4149 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4150 to be a constant, this is old-skool offsetof-like nonsense. */
4151 if (TREE_CODE (op0
) == INDIRECT_REF
4152 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4153 return null_pointer_node
;
4154 /* Taking the address of a nested function involves a trampoline,
4155 unless we don't need or want one. */
4156 if (TREE_CODE (op0
) == FUNCTION_DECL
4157 && DECL_STATIC_CHAIN (op0
)
4158 && !TREE_NO_TRAMPOLINE (value
))
4160 /* "&{...}" requires a temporary to hold the constructed
4162 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4168 case NON_LVALUE_EXPR
:
4169 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4172 case VIEW_CONVERT_EXPR
:
4174 tree src
= TREE_OPERAND (value
, 0);
4175 tree src_type
= TREE_TYPE (src
);
4176 tree dest_type
= TREE_TYPE (value
);
4178 /* Allow view-conversions from aggregate to non-aggregate type only
4179 if the bit pattern is fully preserved afterwards; otherwise, the
4180 RTL expander won't be able to apply a subsequent transformation
4181 to the underlying constructor. */
4182 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4184 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4185 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4190 /* Allow all other kinds of view-conversion. */
4191 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4196 tree src
= TREE_OPERAND (value
, 0);
4197 tree src_type
= TREE_TYPE (src
);
4198 tree dest_type
= TREE_TYPE (value
);
4200 /* Allow conversions between pointer types, floating-point
4201 types, and offset types. */
4202 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4203 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4204 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4205 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4206 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4208 /* Allow length-preserving conversions between integer types. */
4209 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4210 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4211 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4213 /* Allow conversions between other integer types only if
4215 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4217 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4218 if (inner
== null_pointer_node
)
4219 return null_pointer_node
;
4223 /* Allow (int) &foo provided int is as wide as a pointer. */
4224 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4225 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4226 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4228 /* Likewise conversions from int to pointers, but also allow
4229 conversions from 0. */
4230 if ((POINTER_TYPE_P (dest_type
)
4231 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4232 && INTEGRAL_TYPE_P (src_type
))
4234 if (TREE_CODE (src
) == INTEGER_CST
4235 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4236 return null_pointer_node
;
4237 if (integer_zerop (src
))
4238 return null_pointer_node
;
4239 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4240 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4243 /* Allow conversions to struct or union types if the value
4245 if (TREE_CODE (dest_type
) == RECORD_TYPE
4246 || TREE_CODE (dest_type
) == UNION_TYPE
)
4247 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4251 case POINTER_PLUS_EXPR
:
4253 /* Any valid floating-point constants will have been folded by now;
4254 with -frounding-math we hit this with addition of two constants. */
4255 if (TREE_CODE (endtype
) == REAL_TYPE
)
4257 if (cache
&& cache
[0] == value
)
4259 if (! INTEGRAL_TYPE_P (endtype
)
4260 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4262 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4264 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4267 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4268 endtype
, ncache
+ 2);
4269 /* If either term is absolute, use the other term's relocation. */
4270 if (valid0
== null_pointer_node
)
4272 else if (valid1
== null_pointer_node
)
4274 /* Support narrowing pointer differences. */
4276 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4280 /* Support narrowing pointer differences. */
4281 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4290 if (TREE_CODE (endtype
) == REAL_TYPE
)
4292 if (cache
&& cache
[0] == value
)
4294 if (! INTEGRAL_TYPE_P (endtype
)
4295 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4297 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4299 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4302 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4303 endtype
, ncache
+ 2);
4304 /* Win if second argument is absolute. */
4305 if (valid1
== null_pointer_node
)
4307 /* Win if both arguments have the same relocation.
4308 Then the value is absolute. */
4309 else if (valid0
== valid1
&& valid0
!= 0)
4310 ret
= null_pointer_node
;
4311 /* Since GCC guarantees that string constants are unique in the
4312 generated code, a subtraction between two copies of the same
4313 constant string is absolute. */
4314 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4315 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4316 && operand_equal_p (valid0
, valid1
, 1))
4317 ret
= null_pointer_node
;
4318 /* Support narrowing differences. */
4320 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4324 /* Support narrowing differences. */
4325 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4340 /* Return nonzero if VALUE is a valid constant-valued expression
4341 for use in initializing a static variable; one that can be an
4342 element of a "constant" initializer.
4344 Return null_pointer_node if the value is absolute;
4345 if it is relocatable, return the variable that determines the relocation.
4346 We assume that VALUE has been folded as much as possible;
4347 therefore, we do not need to check for such things as
4348 arithmetic-combinations of integers. */
4350 initializer_constant_valid_p (tree value
, tree endtype
)
4352 return initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4355 /* Return true if VALUE is a valid constant-valued expression
4356 for use in initializing a static bit-field; one that can be
4357 an element of a "constant" initializer. */
4360 initializer_constant_valid_for_bitfield_p (tree value
)
4362 /* For bitfields we support integer constants or possibly nested aggregates
4364 switch (TREE_CODE (value
))
4368 unsigned HOST_WIDE_INT idx
;
4371 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4372 if (!initializer_constant_valid_for_bitfield_p (elt
))
4380 case VIEW_CONVERT_EXPR
:
4381 case NON_LVALUE_EXPR
:
4383 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4392 /* output_constructor outer state of relevance in recursive calls, typically
4393 for nested aggregate bitfields. */
4396 unsigned int bit_offset
; /* current position in ... */
4397 int byte
; /* ... the outer byte buffer. */
4400 static unsigned HOST_WIDE_INT
4401 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int,
4404 /* Output assembler code for constant EXP to FILE, with no label.
4405 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4406 Assumes output_addressed_constants has been done on EXP already.
4408 Generate exactly SIZE bytes of assembler data, padding at the end
4409 with zeros if necessary. SIZE must always be specified.
4411 SIZE is important for structure constructors,
4412 since trailing members may have been omitted from the constructor.
4413 It is also important for initialization of arrays from string constants
4414 since the full length of the string constant might not be wanted.
4415 It is also needed for initialization of unions, where the initializer's
4416 type is just one member, and that may not be as long as the union.
4418 There a case in which we would fail to output exactly SIZE bytes:
4419 for a structure constructor that wants to produce more than SIZE bytes.
4420 But such constructors will never be generated for any possible input.
4422 ALIGN is the alignment of the data in bits. */
4425 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4427 enum tree_code code
;
4428 unsigned HOST_WIDE_INT thissize
;
4430 if (size
== 0 || flag_syntax_only
)
4433 /* See if we're trying to initialize a pointer in a non-default mode
4434 to the address of some declaration somewhere. If the target says
4435 the mode is valid for pointers, assume the target has a way of
4437 if (TREE_CODE (exp
) == NOP_EXPR
4438 && POINTER_TYPE_P (TREE_TYPE (exp
))
4439 && targetm
.addr_space
.valid_pointer_mode
4440 (TYPE_MODE (TREE_TYPE (exp
)),
4441 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4443 tree saved_type
= TREE_TYPE (exp
);
4445 /* Peel off any intermediate conversions-to-pointer for valid
4447 while (TREE_CODE (exp
) == NOP_EXPR
4448 && POINTER_TYPE_P (TREE_TYPE (exp
))
4449 && targetm
.addr_space
.valid_pointer_mode
4450 (TYPE_MODE (TREE_TYPE (exp
)),
4451 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4452 exp
= TREE_OPERAND (exp
, 0);
4454 /* If what we're left with is the address of something, we can
4455 convert the address to the final type and output it that
4457 if (TREE_CODE (exp
) == ADDR_EXPR
)
4458 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4459 /* Likewise for constant ints. */
4460 else if (TREE_CODE (exp
) == INTEGER_CST
)
4461 exp
= build_int_cst_wide (saved_type
, TREE_INT_CST_LOW (exp
),
4462 TREE_INT_CST_HIGH (exp
));
4466 /* Eliminate any conversions since we'll be outputting the underlying
4468 while (CONVERT_EXPR_P (exp
)
4469 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4470 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4472 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4473 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4475 /* Make sure eliminating the conversion is really a no-op, except with
4476 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4477 union types to allow for Ada unchecked unions. */
4478 if (type_size
> op_size
4479 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4480 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4481 /* Keep the conversion. */
4484 exp
= TREE_OPERAND (exp
, 0);
4487 code
= TREE_CODE (TREE_TYPE (exp
));
4488 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4490 /* Allow a constructor with no elements for any data type.
4491 This means to fill the space with zeros. */
4492 if (TREE_CODE (exp
) == CONSTRUCTOR
4493 && VEC_empty (constructor_elt
, CONSTRUCTOR_ELTS (exp
)))
4495 assemble_zeros (size
);
4499 if (TREE_CODE (exp
) == FDESC_EXPR
)
4501 #ifdef ASM_OUTPUT_FDESC
4502 HOST_WIDE_INT part
= tree_low_cst (TREE_OPERAND (exp
, 1), 0);
4503 tree decl
= TREE_OPERAND (exp
, 0);
4504 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4511 /* Now output the underlying data. If we've handling the padding, return.
4512 Otherwise, break and ensure SIZE is the size written. */
4519 case REFERENCE_TYPE
:
4521 case FIXED_POINT_TYPE
:
4522 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4523 EXPAND_INITIALIZER
),
4524 MIN (size
, thissize
), align
, 0))
4525 error ("initializer for integer/fixed-point value is too complicated");
4529 if (TREE_CODE (exp
) != REAL_CST
)
4530 error ("initializer for floating value is not a floating constant");
4532 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4536 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4537 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4538 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4543 switch (TREE_CODE (exp
))
4546 output_constructor (exp
, size
, align
, NULL
);
4549 thissize
= MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
),
4551 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4558 unsigned int nalign
;
4559 enum machine_mode inner
;
4561 inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4562 nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4564 elt_size
= GET_MODE_SIZE (inner
);
4566 link
= TREE_VECTOR_CST_ELTS (exp
);
4567 output_constant (TREE_VALUE (link
), elt_size
, align
);
4568 thissize
= elt_size
;
4569 while ((link
= TREE_CHAIN (link
)) != NULL
)
4571 output_constant (TREE_VALUE (link
), elt_size
, nalign
);
4572 thissize
+= elt_size
;
4583 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4584 output_constructor (exp
, size
, align
, NULL
);
4594 if (size
> thissize
)
4595 assemble_zeros (size
- thissize
);
4599 /* Subroutine of output_constructor, used for computing the size of
4600 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4601 type with an unspecified upper bound. */
4603 static unsigned HOST_WIDE_INT
4604 array_size_for_constructor (tree val
)
4607 unsigned HOST_WIDE_INT cnt
;
4608 tree index
, value
, tmp
;
4610 /* This code used to attempt to handle string constants that are not
4611 arrays of single-bytes, but nothing else does, so there's no point in
4613 if (TREE_CODE (val
) == STRING_CST
)
4614 return TREE_STRING_LENGTH (val
);
4616 max_index
= NULL_TREE
;
4617 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4619 if (TREE_CODE (index
) == RANGE_EXPR
)
4620 index
= TREE_OPERAND (index
, 1);
4621 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4625 if (max_index
== NULL_TREE
)
4628 /* Compute the total number of array elements. */
4629 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4630 i
= size_binop (MINUS_EXPR
, fold_convert (sizetype
, max_index
),
4631 fold_convert (sizetype
, tmp
));
4632 i
= size_binop (PLUS_EXPR
, i
, size_one_node
);
4634 /* Multiply by the array element unit size to find number of bytes. */
4635 i
= size_binop (MULT_EXPR
, i
, TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4637 return tree_low_cst (i
, 1);
4640 /* Other datastructures + helpers for output_constructor. */
4642 /* output_constructor local state to support interaction with helpers. */
4646 /* Received arguments. */
4647 tree exp
; /* Constructor expression. */
4648 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4649 unsigned int align
; /* Known initial alignment. */
4651 /* Constructor expression data. */
4652 tree type
; /* Expression type. */
4653 tree field
; /* Current field decl in a record. */
4654 tree min_index
; /* Lower bound if specified for an array. */
4656 /* Output processing state. */
4657 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4658 bool byte_buffer_in_use
; /* Whether byte ... */
4659 int byte
; /* ... contains part of a bitfield byte yet to
4662 int last_relative_index
; /* Implicit or explicit index of the last
4663 array element output within a bitfield. */
4664 /* Current element. */
4665 tree val
; /* Current element value. */
4666 tree index
; /* Current element index. */
4670 /* Helper for output_constructor. From the current LOCAL state, output a
4671 RANGE_EXPR element. */
4674 output_constructor_array_range (oc_local_state
*local
)
4676 unsigned HOST_WIDE_INT fieldsize
4677 = int_size_in_bytes (TREE_TYPE (local
->type
));
4679 HOST_WIDE_INT lo_index
4680 = tree_low_cst (TREE_OPERAND (local
->index
, 0), 0);
4681 HOST_WIDE_INT hi_index
4682 = tree_low_cst (TREE_OPERAND (local
->index
, 1), 0);
4683 HOST_WIDE_INT index
;
4686 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4688 for (index
= lo_index
; index
<= hi_index
; index
++)
4690 /* Output the element's initial value. */
4691 if (local
->val
== NULL_TREE
)
4692 assemble_zeros (fieldsize
);
4694 output_constant (local
->val
, fieldsize
, align2
);
4696 /* Count its size. */
4697 local
->total_bytes
+= fieldsize
;
4701 /* Helper for output_constructor. From the current LOCAL state, output a
4702 field element that is not true bitfield or part of an outer one. */
4705 output_constructor_regular_field (oc_local_state
*local
)
4707 /* Field size and position. Since this structure is static, we know the
4708 positions are constant. */
4709 unsigned HOST_WIDE_INT fieldsize
;
4710 HOST_WIDE_INT fieldpos
;
4712 unsigned int align2
;
4714 if (local
->index
!= NULL_TREE
)
4715 fieldpos
= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
)), 1)
4716 * ((tree_low_cst (local
->index
, 0)
4717 - tree_low_cst (local
->min_index
, 0))));
4718 else if (local
->field
!= NULL_TREE
)
4719 fieldpos
= int_byte_position (local
->field
);
4723 /* Output any buffered-up bit-fields preceding this element. */
4724 if (local
->byte_buffer_in_use
)
4726 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4727 local
->total_bytes
++;
4728 local
->byte_buffer_in_use
= false;
4731 /* Advance to offset of this element.
4732 Note no alignment needed in an array, since that is guaranteed
4733 if each element has the proper size. */
4734 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4735 && fieldpos
!= local
->total_bytes
)
4737 gcc_assert (fieldpos
>= local
->total_bytes
);
4738 assemble_zeros (fieldpos
- local
->total_bytes
);
4739 local
->total_bytes
= fieldpos
;
4742 /* Find the alignment of this element. */
4743 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
4745 /* Determine size this element should occupy. */
4750 /* If this is an array with an unspecified upper bound,
4751 the initializer determines the size. */
4752 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4753 but we cannot do this until the deprecated support for
4754 initializing zero-length array members is removed. */
4755 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
4756 && TYPE_DOMAIN (TREE_TYPE (local
->field
))
4757 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
))))
4759 fieldsize
= array_size_for_constructor (local
->val
);
4760 /* Given a non-empty initialization, this field had
4762 gcc_assert (!fieldsize
|| !DECL_CHAIN (local
->field
));
4764 else if (DECL_SIZE_UNIT (local
->field
))
4766 /* ??? This can't be right. If the decl size overflows
4767 a host integer we will silently emit no data. */
4768 if (host_integerp (DECL_SIZE_UNIT (local
->field
), 1))
4769 fieldsize
= tree_low_cst (DECL_SIZE_UNIT (local
->field
), 1);
4773 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
4775 /* Output the element's initial value. */
4776 if (local
->val
== NULL_TREE
)
4777 assemble_zeros (fieldsize
);
4779 output_constant (local
->val
, fieldsize
, align2
);
4781 /* Count its size. */
4782 local
->total_bytes
+= fieldsize
;
4785 /* Helper for output_constructor. From the current LOCAL and OUTER states,
4786 output an element that is a true bitfield or part of an outer one. */
4789 output_constructor_bitfield (oc_local_state
*local
, oc_outer_state
*outer
)
4791 /* Bit size of this element. */
4792 HOST_WIDE_INT ebitsize
4794 ? tree_low_cst (DECL_SIZE (local
->field
), 1)
4795 : tree_low_cst (TYPE_SIZE (TREE_TYPE (local
->type
)), 1));
4797 /* Relative index of this element if this is an array component. */
4798 HOST_WIDE_INT relative_index
4801 ? (tree_low_cst (local
->index
, 0)
4802 - tree_low_cst (local
->min_index
, 0))
4803 : local
->last_relative_index
+ 1)
4806 /* Bit position of this element from the start of the containing
4808 HOST_WIDE_INT constructor_relative_ebitpos
4810 ? int_bit_position (local
->field
)
4811 : ebitsize
* relative_index
);
4813 /* Bit position of this element from the start of a possibly ongoing
4814 outer byte buffer. */
4815 HOST_WIDE_INT byte_relative_ebitpos
4816 = ((outer
? outer
->bit_offset
: 0) + constructor_relative_ebitpos
);
4818 /* From the start of a possibly ongoing outer byte buffer, offsets to
4819 the first bit of this element and to the first bit past the end of
4821 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
4822 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
4824 local
->last_relative_index
= relative_index
;
4826 if (local
->val
== NULL_TREE
)
4827 local
->val
= integer_zero_node
;
4829 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
4830 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
4831 local
->val
= TREE_OPERAND (local
->val
, 0);
4833 if (TREE_CODE (local
->val
) != INTEGER_CST
4834 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
4836 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
4840 /* If this field does not start in this (or, next) byte,
4842 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4844 /* Output remnant of any bit field in previous bytes. */
4845 if (local
->byte_buffer_in_use
)
4847 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4848 local
->total_bytes
++;
4849 local
->byte_buffer_in_use
= false;
4852 /* If still not at proper byte, advance to there. */
4853 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4855 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
4856 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
4857 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
4861 /* Set up the buffer if necessary. */
4862 if (!local
->byte_buffer_in_use
)
4866 local
->byte_buffer_in_use
= true;
4869 /* If this is nested constructor, recurse passing the bit offset and the
4870 pending data, then retrieve the new pending data afterwards. */
4871 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
4873 oc_outer_state output_state
;
4875 output_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
4876 output_state
.byte
= local
->byte
;
4878 += output_constructor (local
->val
, 0, 0, &output_state
);
4879 local
->byte
= output_state
.byte
;
4883 /* Otherwise, we must split the element into pieces that fall within
4884 separate bytes, and combine each byte with previous or following
4886 while (next_offset
< end_offset
)
4890 HOST_WIDE_INT value
;
4891 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
4892 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
4894 /* Advance from byte to byte
4895 within this element when necessary. */
4896 while (next_byte
!= local
->total_bytes
)
4898 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4899 local
->total_bytes
++;
4903 /* Number of bits we can process at once
4904 (all part of the same byte). */
4905 this_time
= MIN (end_offset
- next_offset
,
4906 BITS_PER_UNIT
- next_bit
);
4907 if (BYTES_BIG_ENDIAN
)
4909 /* On big-endian machine, take the most significant bits
4910 first (of the bits that are significant)
4911 and put them into bytes from the most significant end. */
4912 shift
= end_offset
- next_offset
- this_time
;
4914 /* Don't try to take a bunch of bits that cross
4915 the word boundary in the INTEGER_CST. We can
4916 only select bits from the LOW or HIGH part
4918 if (shift
< HOST_BITS_PER_WIDE_INT
4919 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4921 this_time
= shift
+ this_time
- HOST_BITS_PER_WIDE_INT
;
4922 shift
= HOST_BITS_PER_WIDE_INT
;
4925 /* Now get the bits from the appropriate constant word. */
4926 if (shift
< HOST_BITS_PER_WIDE_INT
)
4927 value
= TREE_INT_CST_LOW (local
->val
);
4930 gcc_assert (shift
< 2 * HOST_BITS_PER_WIDE_INT
);
4931 value
= TREE_INT_CST_HIGH (local
->val
);
4932 shift
-= HOST_BITS_PER_WIDE_INT
;
4935 /* Get the result. This works only when:
4936 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4937 local
->byte
|= (((value
>> shift
)
4938 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
4939 << (BITS_PER_UNIT
- this_time
- next_bit
));
4943 /* On little-endian machines,
4944 take first the least significant bits of the value
4945 and pack them starting at the least significant
4946 bits of the bytes. */
4947 shift
= next_offset
- byte_relative_ebitpos
;
4949 /* Don't try to take a bunch of bits that cross
4950 the word boundary in the INTEGER_CST. We can
4951 only select bits from the LOW or HIGH part
4953 if (shift
< HOST_BITS_PER_WIDE_INT
4954 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4955 this_time
= (HOST_BITS_PER_WIDE_INT
- shift
);
4957 /* Now get the bits from the appropriate constant word. */
4958 if (shift
< HOST_BITS_PER_WIDE_INT
)
4959 value
= TREE_INT_CST_LOW (local
->val
);
4962 gcc_assert (shift
< 2 * HOST_BITS_PER_WIDE_INT
);
4963 value
= TREE_INT_CST_HIGH (local
->val
);
4964 shift
-= HOST_BITS_PER_WIDE_INT
;
4967 /* Get the result. This works only when:
4968 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4969 local
->byte
|= (((value
>> shift
)
4970 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
4974 next_offset
+= this_time
;
4975 local
->byte_buffer_in_use
= true;
4979 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
4980 Generate at least SIZE bytes, padding if necessary. OUTER designates the
4981 caller output state of relevance in recursive invocations. */
4983 static unsigned HOST_WIDE_INT
4984 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
4985 unsigned int align
, oc_outer_state
* outer
)
4987 unsigned HOST_WIDE_INT cnt
;
4988 constructor_elt
*ce
;
4990 oc_local_state local
;
4992 /* Setup our local state to communicate with helpers. */
4995 local
.align
= align
;
4997 local
.total_bytes
= 0;
4998 local
.byte_buffer_in_use
= outer
!= NULL
;
4999 local
.byte
= outer
? outer
->byte
: 0;
5001 local
.type
= TREE_TYPE (exp
);
5003 local
.last_relative_index
= -1;
5005 local
.min_index
= NULL_TREE
;
5006 if (TREE_CODE (local
.type
) == ARRAY_TYPE
5007 && TYPE_DOMAIN (local
.type
) != NULL_TREE
)
5008 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5010 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5012 /* As CE goes through the elements of the constant, FIELD goes through the
5013 structure fields if the constant is a structure. If the constant is a
5014 union, we override this by getting the field from the TREE_LIST element.
5015 But the constant could also be an array. Then FIELD is zero.
5017 There is always a maximum of one element in the chain LINK for unions
5018 (even if the initializer in a source program incorrectly contains
5021 local
.field
= NULL_TREE
;
5022 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5023 local
.field
= TYPE_FIELDS (local
.type
);
5026 VEC_iterate (constructor_elt
, CONSTRUCTOR_ELTS (exp
), cnt
, ce
);
5027 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5029 local
.val
= ce
->value
;
5030 local
.index
= NULL_TREE
;
5032 /* The element in a union constructor specifies the proper field
5034 if ((TREE_CODE (local
.type
) == RECORD_TYPE
5035 || TREE_CODE (local
.type
) == UNION_TYPE
5036 || TREE_CODE (local
.type
) == QUAL_UNION_TYPE
)
5037 && ce
->index
!= NULL_TREE
)
5038 local
.field
= ce
->index
;
5040 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5041 local
.index
= ce
->index
;
5043 #ifdef ASM_COMMENT_START
5044 if (local
.field
&& flag_verbose_asm
)
5045 fprintf (asm_out_file
, "%s %s:\n",
5047 DECL_NAME (local
.field
)
5048 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5052 /* Eliminate the marker that makes a cast not be an lvalue. */
5053 if (local
.val
!= NULL_TREE
)
5054 STRIP_NOPS (local
.val
);
5056 /* Output the current element, using the appropriate helper ... */
5058 /* For an array slice not part of an outer bitfield. */
5060 && local
.index
!= NULL_TREE
5061 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5062 output_constructor_array_range (&local
);
5064 /* For a field that is neither a true bitfield nor part of an outer one,
5065 known to be at least byte aligned and multiple-of-bytes long. */
5067 && (local
.field
== NULL_TREE
5068 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5069 output_constructor_regular_field (&local
);
5071 /* For a true bitfield or part of an outer one. */
5073 output_constructor_bitfield (&local
, outer
);
5076 /* If we are not at toplevel, save the pending data for our caller.
5077 Otherwise output the pending data and padding zeros as needed. */
5079 outer
->byte
= local
.byte
;
5082 if (local
.byte_buffer_in_use
)
5084 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5085 local
.total_bytes
++;
5088 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5090 assemble_zeros (local
.size
- local
.total_bytes
);
5091 local
.total_bytes
= local
.size
;
5095 return local
.total_bytes
;
5098 /* Mark DECL as weak. */
5101 mark_weak (tree decl
)
5103 DECL_WEAK (decl
) = 1;
5105 if (DECL_RTL_SET_P (decl
)
5106 && MEM_P (DECL_RTL (decl
))
5107 && XEXP (DECL_RTL (decl
), 0)
5108 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5109 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5112 /* Merge weak status between NEWDECL and OLDDECL. */
5115 merge_weak (tree newdecl
, tree olddecl
)
5117 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5119 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5122 /* We put the NEWDECL on the weak_decls list at some point
5123 and OLDDECL as well. Keep just OLDDECL on the list. */
5124 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5125 if (TREE_VALUE (*pwd
) == newdecl
)
5127 *pwd
= TREE_CHAIN (*pwd
);
5134 if (DECL_WEAK (newdecl
))
5138 /* NEWDECL is weak, but OLDDECL is not. */
5140 /* If we already output the OLDDECL, we're in trouble; we can't
5141 go back and make it weak. This should never happen in
5142 unit-at-a-time compilation. */
5143 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5145 /* If we've already generated rtl referencing OLDDECL, we may
5146 have done so in a way that will not function properly with
5147 a weak symbol. Again in unit-at-a-time this should be
5149 gcc_assert (!TREE_USED (olddecl
)
5150 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5152 if (TARGET_SUPPORTS_WEAK
)
5154 /* We put the NEWDECL on the weak_decls list at some point.
5155 Replace it with the OLDDECL. */
5156 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5157 if (TREE_VALUE (wd
) == newdecl
)
5159 TREE_VALUE (wd
) = olddecl
;
5162 /* We may not find the entry on the list. If NEWDECL is a
5163 weak alias, then we will have already called
5164 globalize_decl to remove the entry; in that case, we do
5165 not need to do anything. */
5168 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5169 mark_weak (olddecl
);
5172 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5173 weak. Just update NEWDECL to indicate that it's weak too. */
5174 mark_weak (newdecl
);
5177 /* Declare DECL to be a weak symbol. */
5180 declare_weak (tree decl
)
5182 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5183 if (! TREE_PUBLIC (decl
))
5184 error ("weak declaration of %q+D must be public", decl
);
5185 else if (!TARGET_SUPPORTS_WEAK
)
5186 warning (0, "weak declaration of %q+D not supported", decl
);
5189 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5190 DECL_ATTRIBUTES (decl
)
5191 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5195 weak_finish_1 (tree decl
)
5197 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5198 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5201 if (! TREE_USED (decl
))
5204 #ifdef ASM_WEAKEN_DECL
5205 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5207 #ifdef ASM_WEAKEN_LABEL
5208 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5210 #ifdef ASM_OUTPUT_WEAK_ALIAS
5212 static bool warn_once
= 0;
5215 warning (0, "only weak aliases are supported in this configuration");
5225 /* This TREE_LIST contains weakref targets. */
5227 static GTY(()) tree weakref_targets
;
5229 /* Forward declaration. */
5230 static tree
find_decl_and_mark_needed (tree decl
, tree target
);
5232 /* Emit any pending weak declarations. */
5239 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5241 tree alias_decl
= TREE_PURPOSE (t
);
5242 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5244 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5245 /* Remove alias_decl from the weak list, but leave entries for
5246 the target alone. */
5248 #ifndef ASM_OUTPUT_WEAKREF
5249 else if (! TREE_SYMBOL_REFERENCED (target
))
5251 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5252 defined, otherwise we and weak_finish_1 would use
5253 different macros. */
5254 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5255 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5257 tree decl
= find_decl_and_mark_needed (alias_decl
, target
);
5261 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5262 TREE_CODE (alias_decl
), target
,
5263 TREE_TYPE (alias_decl
));
5265 DECL_EXTERNAL (decl
) = 1;
5266 TREE_PUBLIC (decl
) = 1;
5267 DECL_ARTIFICIAL (decl
) = 1;
5268 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5269 TREE_USED (decl
) = 1;
5272 weak_finish_1 (decl
);
5281 /* Remove the alias and the target from the pending weak list
5282 so that we do not emit any .weak directives for the former,
5283 nor multiple .weak directives for the latter. */
5284 for (p
= &weak_decls
; (t2
= *p
) ; )
5286 if (TREE_VALUE (t2
) == alias_decl
5287 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5288 *p
= TREE_CHAIN (t2
);
5290 p
= &TREE_CHAIN (t2
);
5293 /* Remove other weakrefs to the same target, to speed things up. */
5294 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5296 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5297 *p
= TREE_CHAIN (t2
);
5299 p
= &TREE_CHAIN (t2
);
5304 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5306 tree decl
= TREE_VALUE (t
);
5308 weak_finish_1 (decl
);
5312 /* Emit the assembly bits to indicate that DECL is globally visible. */
5315 globalize_decl (tree decl
)
5318 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5319 if (DECL_WEAK (decl
))
5321 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5324 #ifdef ASM_WEAKEN_DECL
5325 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5327 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5330 /* Remove this function from the pending weak list so that
5331 we do not emit multiple .weak directives for it. */
5332 for (p
= &weak_decls
; (t
= *p
) ; )
5334 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5335 *p
= TREE_CHAIN (t
);
5337 p
= &TREE_CHAIN (t
);
5340 /* Remove weakrefs to the same target from the pending weakref
5341 list, for the same reason. */
5342 for (p
= &weakref_targets
; (t
= *p
) ; )
5344 if (DECL_ASSEMBLER_NAME (decl
)
5345 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5346 *p
= TREE_CHAIN (t
);
5348 p
= &TREE_CHAIN (t
);
5355 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5358 VEC(alias_pair
,gc
) *alias_pairs
;
5360 /* Given an assembly name, find the decl it is associated with. At the
5361 same time, mark it needed for cgraph. */
5364 find_decl_and_mark_needed (tree decl
, tree target
)
5366 struct cgraph_node
*fnode
= NULL
;
5367 struct varpool_node
*vnode
= NULL
;
5369 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5371 fnode
= cgraph_node_for_asm (target
);
5373 vnode
= varpool_node_for_asm (target
);
5377 vnode
= varpool_node_for_asm (target
);
5379 fnode
= cgraph_node_for_asm (target
);
5384 cgraph_mark_needed_node (fnode
);
5389 varpool_mark_needed_node (vnode
);
5390 vnode
->force_output
= 1;
5397 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5398 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5399 tree node is DECL to have the value of the tree node TARGET. */
5402 do_assemble_alias (tree decl
, tree target
)
5404 /* Emulated TLS had better not get this var. */
5405 gcc_assert(!(!targetm
.have_tls
5406 && TREE_CODE (decl
) == VAR_DECL
5407 && DECL_THREAD_LOCAL_P (decl
)));
5409 if (TREE_ASM_WRITTEN (decl
))
5412 /* We must force creation of DECL_RTL for debug info generation, even though
5413 we don't use it here. */
5414 make_decl_rtl (decl
);
5416 TREE_ASM_WRITTEN (decl
) = 1;
5417 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5419 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5421 ultimate_transparent_alias_target (&target
);
5423 if (!TREE_SYMBOL_REFERENCED (target
))
5424 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5426 #ifdef ASM_OUTPUT_WEAKREF
5427 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5428 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5429 IDENTIFIER_POINTER (target
));
5431 if (!TARGET_SUPPORTS_WEAK
)
5433 error_at (DECL_SOURCE_LOCATION (decl
),
5434 "weakref is not supported in this configuration");
5441 #ifdef ASM_OUTPUT_DEF
5442 /* Make name accessible from other files, if appropriate. */
5444 if (TREE_PUBLIC (decl
))
5446 globalize_decl (decl
);
5447 maybe_assemble_visibility (decl
);
5449 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5451 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE) && HAVE_GNU_INDIRECT_FUNCTION
5452 ASM_OUTPUT_TYPE_DIRECTIVE
5453 (asm_out_file
, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5456 error_at (DECL_SOURCE_LOCATION (decl
),
5457 "ifunc is not supported in this configuration");
5461 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5462 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5464 ASM_OUTPUT_DEF (asm_out_file
,
5465 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5466 IDENTIFIER_POINTER (target
));
5468 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5473 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5474 # ifdef ASM_WEAKEN_DECL
5475 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5477 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5479 /* Remove this function from the pending weak list so that
5480 we do not emit multiple .weak directives for it. */
5481 for (p
= &weak_decls
; (t
= *p
) ; )
5482 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5483 *p
= TREE_CHAIN (t
);
5485 p
= &TREE_CHAIN (t
);
5487 /* Remove weakrefs to the same target from the pending weakref
5488 list, for the same reason. */
5489 for (p
= &weakref_targets
; (t
= *p
) ; )
5491 if (DECL_ASSEMBLER_NAME (decl
)
5492 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5493 *p
= TREE_CHAIN (t
);
5495 p
= &TREE_CHAIN (t
);
5502 /* Allocate and construct a symbol alias set. */
5504 static symbol_alias_set_t
*
5505 symbol_alias_set_create (void)
5507 return pointer_set_create ();
5510 /* Destruct and free a symbol alias set. */
5513 symbol_alias_set_destroy (symbol_alias_set_t
*aset
)
5515 pointer_set_destroy (aset
);
5518 /* Test if a symbol alias set contains a given name. */
5521 symbol_alias_set_contains (const symbol_alias_set_t
*aset
, tree t
)
5523 /* We accept either a DECL or an IDENTIFIER directly. */
5524 if (TREE_CODE (t
) != IDENTIFIER_NODE
)
5525 t
= DECL_ASSEMBLER_NAME (t
);
5526 t
= targetm
.asm_out
.mangle_assembler_name (IDENTIFIER_POINTER (t
));
5527 return pointer_set_contains (aset
, t
);
5530 /* Enter a new name into a symbol alias set. */
5533 symbol_alias_set_insert (symbol_alias_set_t
*aset
, tree t
)
5535 /* We accept either a DECL or an IDENTIFIER directly. */
5536 if (TREE_CODE (t
) != IDENTIFIER_NODE
)
5537 t
= DECL_ASSEMBLER_NAME (t
);
5538 t
= targetm
.asm_out
.mangle_assembler_name (IDENTIFIER_POINTER (t
));
5539 return pointer_set_insert (aset
, t
);
5542 /* IN_SET_P is a predicate function assuming to be taken
5543 alias_pair->decl, alias_pair->target and DATA arguments.
5545 Compute set of aliases by including everything where TRIVIALLY_VISIBLE
5546 predeicate is true and propagate across aliases such that when
5547 alias DECL is included, its TARGET is included too. */
5549 static symbol_alias_set_t
*
5550 propagate_aliases_forward (bool (*in_set_p
)
5551 (tree decl
, tree target
, void *data
),
5554 symbol_alias_set_t
*set
;
5559 set
= symbol_alias_set_create ();
5560 for (i
= 0; VEC_iterate (alias_pair
, alias_pairs
, i
, p
); ++i
)
5561 if (in_set_p (p
->decl
, p
->target
, data
))
5562 symbol_alias_set_insert (set
, p
->decl
);
5566 for (i
= 0; VEC_iterate (alias_pair
, alias_pairs
, i
, p
); ++i
)
5567 if (symbol_alias_set_contains (set
, p
->decl
)
5568 && !symbol_alias_set_insert (set
, p
->target
))
5576 /* Like propagate_aliases_forward but do backward propagation. */
5578 symbol_alias_set_t
*
5579 propagate_aliases_backward (bool (*in_set_p
)
5580 (tree decl
, tree target
, void *data
),
5583 symbol_alias_set_t
*set
;
5588 /* We have to compute the set of set nodes including aliases
5590 set
= symbol_alias_set_create ();
5591 for (i
= 0; VEC_iterate (alias_pair
, alias_pairs
, i
, p
); ++i
)
5592 if (in_set_p (p
->decl
, p
->target
, data
))
5593 symbol_alias_set_insert (set
, p
->target
);
5597 for (i
= 0; VEC_iterate (alias_pair
, alias_pairs
, i
, p
); ++i
)
5598 if (symbol_alias_set_contains (set
, p
->target
)
5599 && !symbol_alias_set_insert (set
, p
->decl
))
5606 /* See if the alias is trivially visible. This means
5607 1) alias is expoerted from the unit or
5608 2) alias is used in the code.
5609 We assume that unused cgraph/varpool nodes has been
5611 Used as callback for propagate_aliases. */
5614 trivially_visible_alias (tree decl
, tree target ATTRIBUTE_UNUSED
,
5615 void *data ATTRIBUTE_UNUSED
)
5617 struct cgraph_node
*fnode
= NULL
;
5618 struct varpool_node
*vnode
= NULL
;
5620 if (!TREE_PUBLIC (decl
))
5622 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5623 fnode
= cgraph_get_node (decl
);
5625 vnode
= varpool_get_node (decl
);
5626 return vnode
|| fnode
;
5632 /* See if the target of alias is defined in this unit.
5633 Used as callback for propagate_aliases. */
5636 trivially_defined_alias (tree decl ATTRIBUTE_UNUSED
,
5638 void *data ATTRIBUTE_UNUSED
)
5640 struct cgraph_node
*fnode
= NULL
;
5641 struct varpool_node
*vnode
= NULL
;
5643 fnode
= cgraph_node_for_asm (target
);
5644 vnode
= (fnode
== NULL
) ? varpool_node_for_asm (target
) : NULL
;
5645 return (fnode
&& fnode
->analyzed
) || (vnode
&& vnode
->finalized
);
5648 /* Remove the alias pairing for functions that are no longer in the call
5652 remove_unreachable_alias_pairs (void)
5654 symbol_alias_set_t
*visible
;
5658 if (alias_pairs
== NULL
)
5661 /* We have to compute the set of visible nodes including aliases
5663 visible
= propagate_aliases_forward (trivially_visible_alias
, NULL
);
5665 for (i
= 0; VEC_iterate (alias_pair
, alias_pairs
, i
, p
); )
5667 if (!DECL_EXTERNAL (p
->decl
)
5668 && !symbol_alias_set_contains (visible
, p
->decl
))
5670 VEC_unordered_remove (alias_pair
, alias_pairs
, i
);
5677 symbol_alias_set_destroy (visible
);
5681 /* First pass of completing pending aliases. Make sure that cgraph knows
5682 which symbols will be required. */
5685 finish_aliases_1 (void)
5687 symbol_alias_set_t
*defined
;
5691 if (alias_pairs
== NULL
)
5694 /* We have to compute the set of defined nodes including aliases
5696 defined
= propagate_aliases_backward (trivially_defined_alias
, NULL
);
5698 FOR_EACH_VEC_ELT (alias_pair
, alias_pairs
, i
, p
)
5702 target_decl
= find_decl_and_mark_needed (p
->decl
, p
->target
);
5703 if (target_decl
== NULL
)
5705 if (symbol_alias_set_contains (defined
, p
->target
))
5708 if (! (p
->emitted_diags
& ALIAS_DIAG_TO_UNDEF
)
5709 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p
->decl
)))
5711 error ("%q+D aliased to undefined symbol %qE",
5712 p
->decl
, p
->target
);
5713 p
->emitted_diags
|= ALIAS_DIAG_TO_UNDEF
;
5716 else if (! (p
->emitted_diags
& ALIAS_DIAG_TO_EXTERN
)
5717 && DECL_EXTERNAL (target_decl
)
5718 /* We use local aliases for C++ thunks to force the tailcall
5719 to bind locally. This is a hack - to keep it working do
5720 the following (which is not strictly correct). */
5721 && (! TREE_CODE (target_decl
) == FUNCTION_DECL
5722 || ! DECL_VIRTUAL_P (target_decl
))
5723 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p
->decl
)))
5725 error ("%q+D aliased to external symbol %qE",
5726 p
->decl
, p
->target
);
5727 p
->emitted_diags
|= ALIAS_DIAG_TO_EXTERN
;
5731 symbol_alias_set_destroy (defined
);
5734 /* Second pass of completing pending aliases. Emit the actual assembly.
5735 This happens at the end of compilation and thus it is assured that the
5736 target symbol has been emitted. */
5739 finish_aliases_2 (void)
5744 FOR_EACH_VEC_ELT (alias_pair
, alias_pairs
, i
, p
)
5745 do_assemble_alias (p
->decl
, p
->target
);
5747 VEC_truncate (alias_pair
, alias_pairs
, 0);
5750 /* Emit an assembler directive to make the symbol for DECL an alias to
5751 the symbol for TARGET. */
5754 assemble_alias (tree decl
, tree target
)
5757 bool is_weakref
= false;
5759 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5761 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5765 ultimate_transparent_alias_target (&target
);
5767 if (alias
== target
)
5768 error ("weakref %q+D ultimately targets itself", decl
);
5771 #ifndef ASM_OUTPUT_WEAKREF
5772 IDENTIFIER_TRANSPARENT_ALIAS (alias
) = 1;
5773 TREE_CHAIN (alias
) = target
;
5776 if (TREE_PUBLIC (decl
))
5777 error ("weakref %q+D must have static linkage", decl
);
5781 #if !defined (ASM_OUTPUT_DEF)
5782 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5783 error_at (DECL_SOURCE_LOCATION (decl
),
5784 "alias definitions not supported in this configuration");
5787 if (!DECL_WEAK (decl
))
5789 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5790 error_at (DECL_SOURCE_LOCATION (decl
),
5791 "ifunc is not supported in this configuration");
5793 error_at (DECL_SOURCE_LOCATION (decl
),
5794 "only weak aliases are supported in this configuration");
5800 TREE_USED (decl
) = 1;
5802 /* A quirk of the initial implementation of aliases required that the user
5803 add "extern" to all of them. Which is silly, but now historical. Do
5804 note that the symbol is in fact locally defined. */
5806 DECL_EXTERNAL (decl
) = 0;
5808 /* Allow aliases to aliases. */
5809 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5810 cgraph_get_create_node (decl
)->alias
= true;
5812 varpool_node (decl
)->alias
= true;
5814 /* If the target has already been emitted, we don't have to queue the
5815 alias. This saves a tad of memory. */
5816 if (cgraph_global_info_ready
)
5817 target_decl
= find_decl_and_mark_needed (decl
, target
);
5820 if (target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5821 do_assemble_alias (decl
, target
);
5824 alias_pair
*p
= VEC_safe_push (alias_pair
, gc
, alias_pairs
, NULL
);
5827 p
->emitted_diags
= ALIAS_DIAG_NONE
;
5831 /* Emit an assembler directive to set symbol for DECL visibility to
5832 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5835 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5836 int vis ATTRIBUTE_UNUSED
)
5838 #ifdef HAVE_GAS_HIDDEN
5839 static const char * const visibility_types
[] = {
5840 NULL
, "protected", "hidden", "internal"
5843 const char *name
, *type
;
5845 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5846 type
= visibility_types
[vis
];
5848 fprintf (asm_out_file
, "\t.%s\t", type
);
5849 assemble_name (asm_out_file
, name
);
5850 fprintf (asm_out_file
, "\n");
5852 warning (OPT_Wattributes
, "visibility attribute not supported "
5853 "in this configuration; ignored");
5857 /* A helper function to call assemble_visibility when needed for a decl. */
5860 maybe_assemble_visibility (tree decl
)
5862 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5864 if (vis
!= VISIBILITY_DEFAULT
)
5866 targetm
.asm_out
.assemble_visibility (decl
, vis
);
5873 /* Returns 1 if the target configuration supports defining public symbols
5874 so that one of them will be chosen at link time instead of generating a
5875 multiply-defined symbol error, whether through the use of weak symbols or
5876 a target-specific mechanism for having duplicates discarded. */
5879 supports_one_only (void)
5881 if (SUPPORTS_ONE_ONLY
)
5883 return TARGET_SUPPORTS_WEAK
;
5886 /* Set up DECL as a public symbol that can be defined in multiple
5887 translation units without generating a linker error. */
5890 make_decl_one_only (tree decl
, tree comdat_group
)
5892 gcc_assert (TREE_CODE (decl
) == VAR_DECL
5893 || TREE_CODE (decl
) == FUNCTION_DECL
);
5895 TREE_PUBLIC (decl
) = 1;
5897 if (SUPPORTS_ONE_ONLY
)
5899 #ifdef MAKE_DECL_ONE_ONLY
5900 MAKE_DECL_ONE_ONLY (decl
);
5902 DECL_COMDAT_GROUP (decl
) = comdat_group
;
5904 else if (TREE_CODE (decl
) == VAR_DECL
5905 && (DECL_INITIAL (decl
) == 0 || DECL_INITIAL (decl
) == error_mark_node
))
5906 DECL_COMMON (decl
) = 1;
5909 gcc_assert (TARGET_SUPPORTS_WEAK
);
5910 DECL_WEAK (decl
) = 1;
5915 init_varasm_once (void)
5917 section_htab
= htab_create_ggc (31, section_entry_hash
,
5918 section_entry_eq
, NULL
);
5919 object_block_htab
= htab_create_ggc (31, object_block_entry_hash
,
5920 object_block_entry_eq
, NULL
);
5921 const_desc_htab
= htab_create_ggc (1009, const_desc_hash
,
5922 const_desc_eq
, NULL
);
5924 const_alias_set
= new_alias_set ();
5925 shared_constant_pool
= create_constant_pool ();
5927 #ifdef TEXT_SECTION_ASM_OP
5928 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
5929 TEXT_SECTION_ASM_OP
);
5932 #ifdef DATA_SECTION_ASM_OP
5933 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5934 DATA_SECTION_ASM_OP
);
5937 #ifdef SDATA_SECTION_ASM_OP
5938 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5939 SDATA_SECTION_ASM_OP
);
5942 #ifdef READONLY_DATA_SECTION_ASM_OP
5943 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
5944 READONLY_DATA_SECTION_ASM_OP
);
5947 #ifdef CTORS_SECTION_ASM_OP
5948 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
5949 CTORS_SECTION_ASM_OP
);
5952 #ifdef DTORS_SECTION_ASM_OP
5953 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
5954 DTORS_SECTION_ASM_OP
);
5957 #ifdef BSS_SECTION_ASM_OP
5958 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5959 output_section_asm_op
,
5960 BSS_SECTION_ASM_OP
);
5963 #ifdef SBSS_SECTION_ASM_OP
5964 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5965 output_section_asm_op
,
5966 SBSS_SECTION_ASM_OP
);
5969 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5970 | SECTION_COMMON
, emit_tls_common
);
5971 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5972 | SECTION_COMMON
, emit_local
);
5973 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5974 | SECTION_COMMON
, emit_common
);
5976 #if defined ASM_OUTPUT_ALIGNED_BSS
5977 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
5981 targetm
.asm_out
.init_sections ();
5983 if (readonly_data_section
== NULL
)
5984 readonly_data_section
= text_section
;
5988 decl_default_tls_model (const_tree decl
)
5990 enum tls_model kind
;
5993 is_local
= targetm
.binds_local_p (decl
);
5997 kind
= TLS_MODEL_LOCAL_EXEC
;
5999 kind
= TLS_MODEL_INITIAL_EXEC
;
6002 /* Local dynamic is inefficient when we're not combining the
6003 parts of the address. */
6004 else if (optimize
&& is_local
)
6005 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
6007 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
6008 if (kind
< flag_tls_default
)
6009 kind
= flag_tls_default
;
6014 /* Select a set of attributes for section NAME based on the properties
6015 of DECL and whether or not RELOC indicates that DECL's initializer
6016 might contain runtime relocations.
6018 We make the section read-only and executable for a function decl,
6019 read-only for a const data decl, and writable for a non-const data decl. */
6022 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6026 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6027 flags
= SECTION_CODE
;
6030 enum section_category category
6031 = categorize_decl_for_section (decl
, reloc
);
6032 if (decl_readonly_section_1 (category
))
6034 else if (category
== SECCAT_DATA_REL_RO
6035 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6036 flags
= SECTION_WRITE
| SECTION_RELRO
;
6038 flags
= SECTION_WRITE
;
6042 flags
= SECTION_WRITE
;
6043 if (strcmp (name
, ".data.rel.ro") == 0
6044 || strcmp (name
, ".data.rel.ro.local") == 0)
6045 flags
|= SECTION_RELRO
;
6048 if (decl
&& DECL_ONE_ONLY (decl
))
6049 flags
|= SECTION_LINKONCE
;
6051 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6052 flags
|= SECTION_TLS
| SECTION_WRITE
;
6054 if (strcmp (name
, ".bss") == 0
6055 || strncmp (name
, ".bss.", 5) == 0
6056 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6057 || strcmp (name
, ".sbss") == 0
6058 || strncmp (name
, ".sbss.", 6) == 0
6059 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6060 flags
|= SECTION_BSS
;
6062 if (strcmp (name
, ".tdata") == 0
6063 || strncmp (name
, ".tdata.", 7) == 0
6064 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6065 flags
|= SECTION_TLS
;
6067 if (strcmp (name
, ".tbss") == 0
6068 || strncmp (name
, ".tbss.", 6) == 0
6069 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6070 flags
|= SECTION_TLS
| SECTION_BSS
;
6072 /* These three sections have special ELF types. They are neither
6073 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6074 want to print a section type (@progbits or @nobits). If someone
6075 is silly enough to emit code or TLS variables to one of these
6076 sections, then don't handle them specially. */
6077 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6078 && (strcmp (name
, ".init_array") == 0
6079 || strcmp (name
, ".fini_array") == 0
6080 || strcmp (name
, ".preinit_array") == 0))
6081 flags
|= SECTION_NOTYPE
;
6086 /* Return true if the target supports some form of global BSS,
6087 either through bss_noswitch_section, or by selecting a BSS
6088 section in TARGET_ASM_SELECT_SECTION. */
6091 have_global_bss_p (void)
6093 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6096 /* Output assembly to switch to section NAME with attribute FLAGS.
6097 Four variants for common object file formats. */
6100 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6101 unsigned int flags ATTRIBUTE_UNUSED
,
6102 tree decl ATTRIBUTE_UNUSED
)
6104 /* Some object formats don't support named sections at all. The
6105 front-end should already have flagged this as an error. */
6109 #ifndef TLS_SECTION_ASM_FLAG
6110 #define TLS_SECTION_ASM_FLAG 'T'
6114 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6115 tree decl ATTRIBUTE_UNUSED
)
6117 char flagchars
[10], *f
= flagchars
;
6119 /* If we have already declared this section, we can use an
6120 abbreviated form to switch back to it -- unless this section is
6121 part of a COMDAT groups, in which case GAS requires the full
6122 declaration every time. */
6123 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6124 && (flags
& SECTION_DECLARED
))
6126 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6130 if (!(flags
& SECTION_DEBUG
))
6132 if (flags
& SECTION_WRITE
)
6134 if (flags
& SECTION_CODE
)
6136 if (flags
& SECTION_SMALL
)
6138 if (flags
& SECTION_MERGE
)
6140 if (flags
& SECTION_STRINGS
)
6142 if (flags
& SECTION_TLS
)
6143 *f
++ = TLS_SECTION_ASM_FLAG
;
6144 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6148 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6150 if (!(flags
& SECTION_NOTYPE
))
6155 if (flags
& SECTION_BSS
)
6161 #ifdef ASM_COMMENT_START
6162 /* On platforms that use "@" as the assembly comment character,
6164 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6167 fprintf (asm_out_file
, format
, type
);
6169 if (flags
& SECTION_ENTSIZE
)
6170 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6171 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6173 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6174 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6176 fprintf (asm_out_file
, ",%s,comdat",
6177 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6181 putc ('\n', asm_out_file
);
6185 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6186 tree decl ATTRIBUTE_UNUSED
)
6188 char flagchars
[8], *f
= flagchars
;
6190 if (flags
& SECTION_WRITE
)
6192 if (flags
& SECTION_CODE
)
6196 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6200 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6203 default_coff_asm_named_section (name
, flags
, decl
);
6205 if (flags
& SECTION_LINKONCE
)
6207 /* Functions may have been compiled at various levels of
6208 optimization so we can't use `same_size' here.
6209 Instead, have the linker pick one. */
6210 fprintf (asm_out_file
, "\t.linkonce %s\n",
6211 (flags
& SECTION_CODE
? "discard" : "same_size"));
6215 /* The lame default section selector. */
6218 default_select_section (tree decl
, int reloc
,
6219 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6223 if (decl_readonly_section (decl
, reloc
))
6224 return readonly_data_section
;
6226 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6228 if (! ((flag_pic
&& reloc
)
6229 || !TREE_READONLY (decl
)
6230 || TREE_SIDE_EFFECTS (decl
)
6231 || !TREE_CONSTANT (decl
)))
6232 return readonly_data_section
;
6234 else if (TREE_CODE (decl
) == STRING_CST
)
6235 return readonly_data_section
;
6236 else if (! (flag_pic
&& reloc
))
6237 return readonly_data_section
;
6239 return data_section
;
6242 enum section_category
6243 categorize_decl_for_section (const_tree decl
, int reloc
)
6245 enum section_category ret
;
6247 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6249 else if (TREE_CODE (decl
) == STRING_CST
)
6251 if (flag_mudflap
) /* or !flag_merge_constants */
6252 return SECCAT_RODATA
;
6254 return SECCAT_RODATA_MERGE_STR
;
6256 else if (TREE_CODE (decl
) == VAR_DECL
)
6258 if (bss_initializer_p (decl
))
6260 else if (! TREE_READONLY (decl
)
6261 || TREE_SIDE_EFFECTS (decl
)
6262 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6264 /* Here the reloc_rw_mask is not testing whether the section should
6265 be read-only or not, but whether the dynamic link will have to
6266 do something. If so, we wish to segregate the data in order to
6267 minimize cache misses inside the dynamic linker. */
6268 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6269 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6273 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6274 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6275 else if (reloc
|| flag_merge_constants
< 2)
6276 /* C and C++ don't allow different variables to share the same
6277 location. -fmerge-all-constants allows even that (at the
6278 expense of not conforming). */
6279 ret
= SECCAT_RODATA
;
6280 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6281 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6283 ret
= SECCAT_RODATA_MERGE_CONST
;
6285 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6287 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6288 || TREE_SIDE_EFFECTS (decl
)
6289 || ! TREE_CONSTANT (decl
))
6292 ret
= SECCAT_RODATA
;
6295 ret
= SECCAT_RODATA
;
6297 /* There are no read-only thread-local sections. */
6298 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6300 /* Note that this would be *just* SECCAT_BSS, except that there's
6301 no concept of a read-only thread-local-data section. */
6302 if (ret
== SECCAT_BSS
6303 || (flag_zero_initialized_in_bss
6304 && initializer_zerop (DECL_INITIAL (decl
))))
6310 /* If the target uses small data sections, select it. */
6311 else if (targetm
.in_small_data_p (decl
))
6313 if (ret
== SECCAT_BSS
)
6315 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6316 ret
= SECCAT_SRODATA
;
6325 decl_readonly_section_1 (enum section_category category
)
6330 case SECCAT_RODATA_MERGE_STR
:
6331 case SECCAT_RODATA_MERGE_STR_INIT
:
6332 case SECCAT_RODATA_MERGE_CONST
:
6333 case SECCAT_SRODATA
:
6341 decl_readonly_section (const_tree decl
, int reloc
)
6343 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6346 /* Select a section based on the above categorization. */
6349 default_elf_select_section (tree decl
, int reloc
,
6350 unsigned HOST_WIDE_INT align
)
6353 switch (categorize_decl_for_section (decl
, reloc
))
6356 /* We're not supposed to be called on FUNCTION_DECLs. */
6359 return readonly_data_section
;
6360 case SECCAT_RODATA_MERGE_STR
:
6361 return mergeable_string_section (decl
, align
, 0);
6362 case SECCAT_RODATA_MERGE_STR_INIT
:
6363 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6364 case SECCAT_RODATA_MERGE_CONST
:
6365 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6366 case SECCAT_SRODATA
:
6370 return data_section
;
6371 case SECCAT_DATA_REL
:
6372 sname
= ".data.rel";
6374 case SECCAT_DATA_REL_LOCAL
:
6375 sname
= ".data.rel.local";
6377 case SECCAT_DATA_REL_RO
:
6378 sname
= ".data.rel.ro";
6380 case SECCAT_DATA_REL_RO_LOCAL
:
6381 sname
= ".data.rel.ro.local";
6406 return get_named_section (decl
, sname
, reloc
);
6409 /* Construct a unique section name based on the decl name and the
6410 categorization performed above. */
6413 default_unique_section (tree decl
, int reloc
)
6415 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6416 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6417 const char *prefix
, *name
, *linkonce
;
6420 switch (categorize_decl_for_section (decl
, reloc
))
6423 prefix
= one_only
? ".t" : ".text";
6426 case SECCAT_RODATA_MERGE_STR
:
6427 case SECCAT_RODATA_MERGE_STR_INIT
:
6428 case SECCAT_RODATA_MERGE_CONST
:
6429 prefix
= one_only
? ".r" : ".rodata";
6431 case SECCAT_SRODATA
:
6432 prefix
= one_only
? ".s2" : ".sdata2";
6435 prefix
= one_only
? ".d" : ".data";
6437 case SECCAT_DATA_REL
:
6438 prefix
= one_only
? ".d.rel" : ".data.rel";
6440 case SECCAT_DATA_REL_LOCAL
:
6441 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6443 case SECCAT_DATA_REL_RO
:
6444 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6446 case SECCAT_DATA_REL_RO_LOCAL
:
6447 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6450 prefix
= one_only
? ".s" : ".sdata";
6453 prefix
= one_only
? ".b" : ".bss";
6456 prefix
= one_only
? ".sb" : ".sbss";
6459 prefix
= one_only
? ".td" : ".tdata";
6462 prefix
= one_only
? ".tb" : ".tbss";
6468 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
6469 name
= targetm
.strip_name_encoding (name
);
6471 /* If we're using one_only, then there needs to be a .gnu.linkonce
6472 prefix to the section name. */
6473 linkonce
= one_only
? ".gnu.linkonce" : "";
6475 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6477 DECL_SECTION_NAME (decl
) = build_string (strlen (string
), string
);
6480 /* Like compute_reloc_for_constant, except for an RTX. The return value
6481 is a mask for which bit 1 indicates a global relocation, and bit 0
6482 indicates a local relocation. */
6485 compute_reloc_for_rtx_1 (rtx
*xp
, void *data
)
6487 int *preloc
= (int *) data
;
6490 switch (GET_CODE (x
))
6493 *preloc
|= SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6506 compute_reloc_for_rtx (rtx x
)
6510 switch (GET_CODE (x
))
6516 for_each_rtx (&x
, compute_reloc_for_rtx_1
, &reloc
);
6525 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
6527 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6529 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6530 return data_section
;
6532 return readonly_data_section
;
6536 default_elf_select_rtx_section (enum machine_mode mode
, rtx x
,
6537 unsigned HOST_WIDE_INT align
)
6539 int reloc
= compute_reloc_for_rtx (x
);
6541 /* ??? Handle small data here somehow. */
6543 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6546 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6548 return get_named_section (NULL
, ".data.rel.ro", 3);
6551 return mergeable_constant_section (mode
, align
, 0);
6554 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6557 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6562 /* Careful not to prod global register variables. */
6565 symbol
= XEXP (rtl
, 0);
6566 if (GET_CODE (symbol
) != SYMBOL_REF
)
6569 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6570 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6571 flags
|= SYMBOL_FLAG_FUNCTION
;
6572 if (targetm
.binds_local_p (decl
))
6573 flags
|= SYMBOL_FLAG_LOCAL
;
6574 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6575 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6576 else if (targetm
.in_small_data_p (decl
))
6577 flags
|= SYMBOL_FLAG_SMALL
;
6578 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6579 being PUBLIC, the thing *must* be defined in this translation unit.
6580 Prevent this buglet from being propagated into rtl code as well. */
6581 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6582 flags
|= SYMBOL_FLAG_EXTERNAL
;
6584 SYMBOL_REF_FLAGS (symbol
) = flags
;
6587 /* By default, we do nothing for encode_section_info, so we need not
6588 do anything but discard the '*' marker. */
6591 default_strip_name_encoding (const char *str
)
6593 return str
+ (*str
== '*');
6596 #ifdef ASM_OUTPUT_DEF
6597 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6598 anchor relative to ".", the current section position. */
6601 default_asm_output_anchor (rtx symbol
)
6605 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6606 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6607 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6611 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6614 default_use_anchors_for_symbol_p (const_rtx symbol
)
6619 /* Don't use anchors for mergeable sections. The linker might move
6620 the objects around. */
6621 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6622 if (sect
->common
.flags
& SECTION_MERGE
)
6625 /* Don't use anchors for small data sections. The small data register
6626 acts as an anchor for such sections. */
6627 if (sect
->common
.flags
& SECTION_SMALL
)
6630 decl
= SYMBOL_REF_DECL (symbol
);
6631 if (decl
&& DECL_P (decl
))
6633 /* Don't use section anchors for decls that might be defined by
6635 if (!targetm
.binds_local_p (decl
))
6638 /* Don't use section anchors for decls that will be placed in a
6639 small data section. */
6640 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6641 one above. The problem is that we only use SECTION_SMALL for
6642 sections that should be marked as small in the section directive. */
6643 if (targetm
.in_small_data_p (decl
))
6649 /* Return true when RESOLUTION indicate that symbol will be bound to the
6650 definition provided by current .o file. */
6653 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6655 return (resolution
== LDPR_PREVAILING_DEF
6656 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6659 /* Return true when RESOLUTION indicate that symbol will be bound locally
6660 within current executable or DSO. */
6663 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6665 return (resolution
== LDPR_PREVAILING_DEF
6666 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6667 || resolution
== LDPR_PREEMPTED_REG
6668 || resolution
== LDPR_PREEMPTED_IR
6669 || resolution
== LDPR_RESOLVED_IR
6670 || resolution
== LDPR_RESOLVED_EXEC
);
6673 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6674 wrt cross-module name binding. */
6677 default_binds_local_p (const_tree exp
)
6679 return default_binds_local_p_1 (exp
, flag_shlib
);
6683 default_binds_local_p_1 (const_tree exp
, int shlib
)
6686 bool resolved_locally
= false;
6687 bool resolved_to_local_def
= false;
6689 /* With resolution file in hands, take look into resolutions.
6690 We can't just return true for resolved_localy symbols,
6691 because dynamic linking might overwrite symbols
6692 in shared libraries. */
6693 if (TREE_CODE (exp
) == VAR_DECL
&& TREE_PUBLIC (exp
)
6694 && (TREE_STATIC (exp
) || DECL_EXTERNAL (exp
)))
6696 struct varpool_node
*vnode
= varpool_get_node (exp
);
6697 if (vnode
&& resolution_local_p (vnode
->resolution
))
6698 resolved_locally
= true;
6700 && resolution_to_local_definition_p (vnode
->resolution
))
6701 resolved_to_local_def
= true;
6703 else if (TREE_CODE (exp
) == FUNCTION_DECL
&& TREE_PUBLIC (exp
))
6705 struct cgraph_node
*node
= cgraph_get_node_or_alias (exp
);
6707 && resolution_local_p (node
->resolution
))
6708 resolved_locally
= true;
6710 && resolution_to_local_definition_p (node
->resolution
))
6711 resolved_to_local_def
= true;
6714 /* A non-decl is an entry in the constant pool. */
6717 /* Weakrefs may not bind locally, even though the weakref itself is
6718 always static and therefore local.
6719 FIXME: We can resolve this more curefuly by looking at the weakref
6721 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
)))
6723 /* Static variables are always local. */
6724 else if (! TREE_PUBLIC (exp
))
6726 /* A variable is local if the user has said explicitly that it will
6728 else if ((DECL_VISIBILITY_SPECIFIED (exp
)
6729 || resolved_to_local_def
)
6730 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6732 /* Variables defined outside this object might not be local. */
6733 else if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6735 /* If defined in this object and visibility is not default, must be
6737 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6739 /* Default visibility weak data can be overridden by a strong symbol
6740 in another module and so are not local. */
6741 else if (DECL_WEAK (exp
)
6742 && !resolved_locally
)
6744 /* If PIC, then assume that any global name can be overridden by
6745 symbols resolved from other modules. */
6748 /* Uninitialized COMMON variable may be unified with symbols
6749 resolved from other modules. */
6750 else if (DECL_COMMON (exp
)
6751 && !resolved_locally
6752 && (DECL_INITIAL (exp
) == NULL
6753 || DECL_INITIAL (exp
) == error_mark_node
))
6755 /* Otherwise we're left with initialized (or non-common) global data
6756 which is of necessity defined locally. */
6763 /* Return true when references to DECL must bind to current definition in
6766 The condition is usually equivalent to whether the function binds to the
6767 current module (shared library or executable), that is to binds_local_p.
6768 We use this fact to avoid need for another target hook and implement
6769 the logic using binds_local_p and just special cases where
6770 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6771 the weak definitions (that can be overwritten at linktime by other
6772 definition from different object file) and when resolution info is available
6773 we simply use the knowledge passed to us by linker plugin. */
6775 decl_binds_to_current_def_p (tree decl
)
6777 gcc_assert (DECL_P (decl
));
6778 if (!TREE_PUBLIC (decl
))
6780 if (!targetm
.binds_local_p (decl
))
6782 /* When resolution is available, just use it. */
6783 if (TREE_CODE (decl
) == VAR_DECL
6784 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)))
6786 struct varpool_node
*vnode
= varpool_get_node (decl
);
6788 && vnode
->resolution
!= LDPR_UNKNOWN
)
6789 return resolution_to_local_definition_p (vnode
->resolution
);
6791 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
6793 struct cgraph_node
*node
= cgraph_get_node_or_alias (decl
);
6795 && node
->resolution
!= LDPR_UNKNOWN
)
6796 return resolution_to_local_definition_p (node
->resolution
);
6798 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6799 binds localy but still can be overwritten).
6800 This rely on fact that binds_local_p behave as decl_replaceable_p
6801 for all other declaration types. */
6802 return !DECL_WEAK (decl
);
6805 /* A replaceable function or variable is one which may be replaced
6806 at link-time with an entirely different definition, provided that the
6807 replacement has the same type. For example, functions declared
6808 with __attribute__((weak)) on most systems are replaceable.
6810 COMDAT functions are not replaceable, since all definitions of the
6811 function must be equivalent. It is important that COMDAT functions
6812 not be treated as replaceable so that use of C++ template
6813 instantiations is not penalized. */
6816 decl_replaceable_p (tree decl
)
6818 gcc_assert (DECL_P (decl
));
6819 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
6821 return !decl_binds_to_current_def_p (decl
);
6824 /* Default function to output code that will globalize a label. A
6825 target must define GLOBAL_ASM_OP or provide its own function to
6826 globalize a label. */
6827 #ifdef GLOBAL_ASM_OP
6829 default_globalize_label (FILE * stream
, const char *name
)
6831 fputs (GLOBAL_ASM_OP
, stream
);
6832 assemble_name (stream
, name
);
6833 putc ('\n', stream
);
6835 #endif /* GLOBAL_ASM_OP */
6837 /* Default function to output code that will globalize a declaration. */
6839 default_globalize_decl_name (FILE * stream
, tree decl
)
6841 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6842 targetm
.asm_out
.globalize_label (stream
, name
);
6845 /* Default function to output a label for unwind information. The
6846 default is to do nothing. A target that needs nonlocal labels for
6847 unwind information must provide its own function to do this. */
6849 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6850 tree decl ATTRIBUTE_UNUSED
,
6851 int for_eh ATTRIBUTE_UNUSED
,
6852 int empty ATTRIBUTE_UNUSED
)
6856 /* Default function to output a label to divide up the exception table.
6857 The default is to do nothing. A target that needs/wants to divide
6858 up the table must provide it's own function to do this. */
6860 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
6864 /* This is how to output an internal numbered label where PREFIX is
6865 the class of label and LABELNO is the number within the class. */
6868 default_generate_internal_label (char *buf
, const char *prefix
,
6869 unsigned long labelno
)
6871 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6874 /* This is how to output an internal numbered label where PREFIX is
6875 the class of label and LABELNO is the number within the class. */
6878 default_internal_label (FILE *stream
, const char *prefix
,
6879 unsigned long labelno
)
6881 char *const buf
= (char *) alloca (40 + strlen (prefix
));
6882 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6883 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
6887 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
6890 default_asm_declare_constant_name (FILE *file
, const char *name
,
6891 const_tree exp ATTRIBUTE_UNUSED
,
6892 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
6894 assemble_label (file
, name
);
6897 /* This is the default behavior at the beginning of a file. It's
6898 controlled by two other target-hook toggles. */
6900 default_file_start (void)
6902 if (targetm
.asm_file_start_app_off
6903 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
6904 fputs (ASM_APP_OFF
, asm_out_file
);
6906 if (targetm
.asm_file_start_file_directive
)
6907 output_file_directive (asm_out_file
, main_input_filename
);
6910 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6911 which emits a special section directive used to indicate whether or
6912 not this object file needs an executable stack. This is primarily
6913 a GNU extension to ELF but could be used on other targets. */
6915 int trampolines_created
;
6918 file_end_indicate_exec_stack (void)
6920 unsigned int flags
= SECTION_DEBUG
;
6921 if (trampolines_created
)
6922 flags
|= SECTION_CODE
;
6924 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
6927 /* Emit a special section directive to indicate that this object file
6928 was compiled with -fsplit-stack. This is used to let the linker
6929 detect calls between split-stack code and non-split-stack code, so
6930 that it can modify the split-stack code to allocate a sufficiently
6931 large stack. We emit another special section if there are any
6932 functions in this file which have the no_split_stack attribute, to
6933 prevent the linker from warning about being unable to convert the
6934 functions if they call non-split-stack code. */
6937 file_end_indicate_split_stack (void)
6939 if (flag_split_stack
)
6941 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
6943 if (saw_no_split_stack
)
6944 switch_to_section (get_section (".note.GNU-no-split-stack",
6945 SECTION_DEBUG
, NULL
));
6949 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6950 a get_unnamed_section callback. */
6953 output_section_asm_op (const void *directive
)
6955 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
6958 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6959 the current section is NEW_SECTION. */
6962 switch_to_section (section
*new_section
)
6964 if (in_section
== new_section
)
6967 if (new_section
->common
.flags
& SECTION_FORGET
)
6970 in_section
= new_section
;
6972 switch (SECTION_STYLE (new_section
))
6975 targetm
.asm_out
.named_section (new_section
->named
.name
,
6976 new_section
->named
.common
.flags
,
6977 new_section
->named
.decl
);
6980 case SECTION_UNNAMED
:
6981 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
6984 case SECTION_NOSWITCH
:
6989 new_section
->common
.flags
|= SECTION_DECLARED
;
6992 /* If block symbol SYMBOL has not yet been assigned an offset, place
6993 it at the end of its block. */
6996 place_block_symbol (rtx symbol
)
6998 unsigned HOST_WIDE_INT size
, mask
, offset
;
6999 struct constant_descriptor_rtx
*desc
;
7000 unsigned int alignment
;
7001 struct object_block
*block
;
7004 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7005 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7008 /* Work out the symbol's size and alignment. */
7009 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7011 desc
= SYMBOL_REF_CONSTANT (symbol
);
7012 alignment
= desc
->align
;
7013 size
= GET_MODE_SIZE (desc
->mode
);
7015 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7017 decl
= SYMBOL_REF_DECL (symbol
);
7018 alignment
= DECL_ALIGN (decl
);
7019 size
= get_constant_size (DECL_INITIAL (decl
));
7023 decl
= SYMBOL_REF_DECL (symbol
);
7024 alignment
= DECL_ALIGN (decl
);
7025 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
7028 /* Calculate the object's offset from the start of the block. */
7029 block
= SYMBOL_REF_BLOCK (symbol
);
7030 mask
= alignment
/ BITS_PER_UNIT
- 1;
7031 offset
= (block
->size
+ mask
) & ~mask
;
7032 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7034 /* Record the block's new alignment and size. */
7035 block
->alignment
= MAX (block
->alignment
, alignment
);
7036 block
->size
= offset
+ size
;
7038 VEC_safe_push (rtx
, gc
, block
->objects
, symbol
);
7041 /* Return the anchor that should be used to address byte offset OFFSET
7042 from the first object in BLOCK. MODEL is the TLS model used
7046 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7047 enum tls_model model
)
7050 unsigned int begin
, middle
, end
;
7051 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7054 /* Work out the anchor's offset. Use an offset of 0 for the first
7055 anchor so that we don't pessimize the case where we take the address
7056 of a variable at the beginning of the block. This is particularly
7057 useful when a block has only one variable assigned to it.
7059 We try to place anchors RANGE bytes apart, so there can then be
7060 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7061 a ptr_mode offset. With some target settings, the lowest such
7062 anchor might be out of range for the lowest ptr_mode offset;
7063 likewise the highest anchor for the highest offset. Use anchors
7064 at the extreme ends of the ptr_mode range in such cases.
7066 All arithmetic uses unsigned integers in order to avoid
7068 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7069 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7070 range
= max_offset
- min_offset
+ 1;
7075 bias
= 1 << (GET_MODE_BITSIZE (ptr_mode
) - 1);
7078 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7079 delta
-= delta
% range
;
7082 offset
= (HOST_WIDE_INT
) (-delta
);
7086 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7087 delta
-= delta
% range
;
7088 if (delta
> bias
- 1)
7090 offset
= (HOST_WIDE_INT
) delta
;
7094 /* Do a binary search to see if there's already an anchor we can use.
7095 Set BEGIN to the new anchor's index if not. */
7097 end
= VEC_length (rtx
, block
->anchors
);
7098 while (begin
!= end
)
7100 middle
= (end
+ begin
) / 2;
7101 anchor
= VEC_index (rtx
, block
->anchors
, middle
);
7102 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7104 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7106 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7108 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7114 /* Create a new anchor with a unique label. */
7115 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7116 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7117 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7118 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7120 /* Insert it at index BEGIN. */
7121 VEC_safe_insert (rtx
, gc
, block
->anchors
, begin
, anchor
);
7125 /* Output the objects in BLOCK. */
7128 output_object_block (struct object_block
*block
)
7130 struct constant_descriptor_rtx
*desc
;
7132 HOST_WIDE_INT offset
;
7136 if (block
->objects
== NULL
)
7139 /* Switch to the section and make sure that the first byte is
7140 suitably aligned. */
7141 switch_to_section (block
->sect
);
7142 assemble_align (block
->alignment
);
7144 /* Define the values of all anchors relative to the current section
7146 FOR_EACH_VEC_ELT (rtx
, block
->anchors
, i
, symbol
)
7147 targetm
.asm_out
.output_anchor (symbol
);
7149 /* Output the objects themselves. */
7151 FOR_EACH_VEC_ELT (rtx
, block
->objects
, i
, symbol
)
7153 /* Move to the object's offset, padding with zeros if necessary. */
7154 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7155 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7156 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7158 desc
= SYMBOL_REF_CONSTANT (symbol
);
7159 output_constant_pool_1 (desc
, 1);
7160 offset
+= GET_MODE_SIZE (desc
->mode
);
7162 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7164 decl
= SYMBOL_REF_DECL (symbol
);
7165 assemble_constant_contents (DECL_INITIAL (decl
), XSTR (symbol
, 0),
7167 offset
+= get_constant_size (DECL_INITIAL (decl
));
7171 decl
= SYMBOL_REF_DECL (symbol
);
7172 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7173 offset
+= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
7178 /* A htab_traverse callback used to call output_object_block for
7179 each member of object_block_htab. */
7182 output_object_block_htab (void **slot
, void *data ATTRIBUTE_UNUSED
)
7184 output_object_block ((struct object_block
*) (*slot
));
7188 /* Output the definitions of all object_blocks. */
7191 output_object_blocks (void)
7193 htab_traverse (object_block_htab
, output_object_block_htab
, NULL
);
7196 /* This function provides a possible implementation of the
7197 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7198 by -frecord-gcc-switches it creates a new mergeable, string section in the
7199 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7200 contains the switches in ASCII format.
7202 FIXME: This code does not correctly handle double quote characters
7203 that appear inside strings, (it strips them rather than preserving them).
7204 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7205 characters - instead it treats them as sub-string separators. Since
7206 we want to emit NUL strings terminators into the object file we have to use
7210 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7214 case SWITCH_TYPE_PASSED
:
7215 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7216 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7219 case SWITCH_TYPE_DESCRIPTIVE
:
7222 /* Distinguish between invocations where name is NULL. */
7223 static bool started
= false;
7229 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7233 | (SECTION_ENTSIZE
& 1),
7235 switch_to_section (sec
);
7244 /* The return value is currently ignored by the caller, but must be 0.
7245 For -fverbose-asm the return value would be the number of characters
7246 emitted into the assembler file. */
7250 /* Emit text to declare externally defined symbols. It is needed to
7251 properly support non-default visibility. */
7253 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7255 const char *name ATTRIBUTE_UNUSED
)
7257 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7258 set in order to avoid putting out names that are never really
7260 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7261 && targetm
.binds_local_p (decl
))
7262 maybe_assemble_visibility (decl
);
7265 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7268 default_asm_output_source_filename (FILE *file
, const char *name
)
7270 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7271 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7273 fprintf (file
, "\t.file\t");
7274 output_quoted_string (file
, name
);
7279 /* Output a file name in the form wanted by System V. */
7282 output_file_directive (FILE *asm_file
, const char *input_name
)
7287 if (input_name
== NULL
)
7288 input_name
= "<stdin>";
7290 input_name
= remap_debug_filename (input_name
);
7292 len
= strlen (input_name
);
7293 na
= input_name
+ len
;
7295 /* NA gets INPUT_NAME sans directory names. */
7296 while (na
> input_name
)
7298 if (IS_DIR_SEPARATOR (na
[-1]))
7303 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7306 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7309 make_debug_expr_from_rtl (const_rtx exp
)
7311 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7312 enum machine_mode mode
= GET_MODE (exp
);
7315 DECL_ARTIFICIAL (ddecl
) = 1;
7316 if (REG_P (exp
) && REG_EXPR (exp
))
7317 type
= TREE_TYPE (REG_EXPR (exp
));
7318 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7319 type
= TREE_TYPE (MEM_EXPR (exp
));
7322 if (type
&& TYPE_MODE (type
) == mode
)
7323 TREE_TYPE (ddecl
) = type
;
7325 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7326 DECL_MODE (ddecl
) = mode
;
7327 dval
= gen_rtx_DEBUG_EXPR (mode
);
7328 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7329 SET_DECL_RTL (ddecl
, dval
);
7333 #include "gt-varasm.h"