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_BSS
125 static void asm_output_bss (FILE *, tree
, const char *,
126 unsigned HOST_WIDE_INT
, unsigned HOST_WIDE_INT
);
128 #ifdef ASM_OUTPUT_ALIGNED_BSS
129 static void asm_output_aligned_bss (FILE *, tree
, const char *,
130 unsigned HOST_WIDE_INT
, int)
133 #endif /* BSS_SECTION_ASM_OP */
134 static void mark_weak (tree
);
135 static void output_constant_pool (const char *, tree
);
137 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
138 section
*text_section
;
139 section
*data_section
;
140 section
*readonly_data_section
;
141 section
*sdata_section
;
142 section
*ctors_section
;
143 section
*dtors_section
;
144 section
*bss_section
;
145 section
*sbss_section
;
147 /* Various forms of common section. All are guaranteed to be nonnull. */
148 section
*tls_comm_section
;
149 section
*comm_section
;
150 section
*lcomm_section
;
152 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
154 section
*bss_noswitch_section
;
156 /* The section that holds the main exception table, when known. The section
157 is set either by the target's init_sections hook or by the first call to
158 switch_to_exception_section. */
159 section
*exception_section
;
161 /* The section that holds the DWARF2 frame unwind information, when known.
162 The section is set either by the target's init_sections hook or by the
163 first call to switch_to_eh_frame_section. */
164 section
*eh_frame_section
;
166 /* asm_out_file's current section. This is NULL if no section has yet
167 been selected or if we lose track of what the current section is. */
170 /* True if code for the current function is currently being directed
171 at the cold section. */
172 bool in_cold_section_p
;
174 /* A linked list of all the unnamed sections. */
175 static GTY(()) section
*unnamed_sections
;
177 /* Return a nonzero value if DECL has a section attribute. */
178 #define IN_NAMED_SECTION(DECL) \
179 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
180 && DECL_SECTION_NAME (DECL) != NULL_TREE)
182 /* Hash table of named sections. */
183 static GTY((param_is (section
))) htab_t section_htab
;
185 /* A table of object_blocks, indexed by section. */
186 static GTY((param_is (struct object_block
))) htab_t object_block_htab
;
188 /* The next number to use for internal anchor labels. */
189 static GTY(()) int anchor_labelno
;
191 /* A pool of constants that can be shared between functions. */
192 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
194 /* Helper routines for maintaining section_htab. */
197 section_entry_eq (const void *p1
, const void *p2
)
199 const section
*old
= (const section
*) p1
;
200 const char *new_name
= (const char *) p2
;
202 return strcmp (old
->named
.name
, new_name
) == 0;
206 section_entry_hash (const void *p
)
208 const section
*old
= (const section
*) p
;
209 return htab_hash_string (old
->named
.name
);
212 /* Return a hash value for section SECT. */
215 hash_section (section
*sect
)
217 if (sect
->common
.flags
& SECTION_NAMED
)
218 return htab_hash_string (sect
->named
.name
);
219 return sect
->common
.flags
;
222 /* Helper routines for maintaining object_block_htab. */
225 object_block_entry_eq (const void *p1
, const void *p2
)
227 const struct object_block
*old
= (const struct object_block
*) p1
;
228 const section
*new_section
= (const section
*) p2
;
230 return old
->sect
== new_section
;
234 object_block_entry_hash (const void *p
)
236 const struct object_block
*old
= (const struct object_block
*) p
;
237 return hash_section (old
->sect
);
240 /* Return a new unnamed section with the given fields. */
243 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
248 sect
= ggc_alloc_section ();
249 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
250 sect
->unnamed
.callback
= callback
;
251 sect
->unnamed
.data
= data
;
252 sect
->unnamed
.next
= unnamed_sections
;
254 unnamed_sections
= sect
;
258 /* Return a SECTION_NOSWITCH section with the given fields. */
261 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
265 sect
= ggc_alloc_section ();
266 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
267 sect
->noswitch
.callback
= callback
;
272 /* Return the named section structure associated with NAME. Create
273 a new section with the given fields if no such structure exists. */
276 get_section (const char *name
, unsigned int flags
, tree decl
)
278 section
*sect
, **slot
;
281 htab_find_slot_with_hash (section_htab
, name
,
282 htab_hash_string (name
), INSERT
);
283 flags
|= SECTION_NAMED
;
286 sect
= ggc_alloc_section ();
287 sect
->named
.common
.flags
= flags
;
288 sect
->named
.name
= ggc_strdup (name
);
289 sect
->named
.decl
= decl
;
295 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
296 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
298 /* It is fine if one of the section flags is
299 SECTION_WRITE | SECTION_RELRO and the other has none of these
300 flags (i.e. read-only) in named sections and either the
301 section hasn't been declared yet or has been declared as writable.
302 In that case just make sure the resulting flags are
303 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
305 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
306 == (SECTION_WRITE
| SECTION_RELRO
)
307 && (sect
->common
.flags
308 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
309 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
310 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
311 || (sect
->common
.flags
& SECTION_WRITE
)))
313 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
316 /* Sanity check user variables for flag changes. */
318 decl
= sect
->named
.decl
;
320 error ("%+D causes a section type conflict", decl
);
321 /* Make sure we don't error about one section multiple times. */
322 sect
->common
.flags
|= SECTION_OVERRIDE
;
328 /* Return true if the current compilation mode benefits from having
329 objects grouped into blocks. */
332 use_object_blocks_p (void)
334 return flag_section_anchors
;
337 /* Return the object_block structure for section SECT. Create a new
338 structure if we haven't created one already. Return null if SECT
341 static struct object_block
*
342 get_block_for_section (section
*sect
)
344 struct object_block
*block
;
350 slot
= htab_find_slot_with_hash (object_block_htab
, sect
,
351 hash_section (sect
), INSERT
);
352 block
= (struct object_block
*) *slot
;
355 block
= ggc_alloc_cleared_object_block ();
362 /* Create a symbol with label LABEL and place it at byte offset
363 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
364 is not yet known. LABEL must be a garbage-collected string. */
367 create_block_symbol (const char *label
, struct object_block
*block
,
368 HOST_WIDE_INT offset
)
373 /* Create the extended SYMBOL_REF. */
374 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
375 symbol
= ggc_alloc_zone_rtx_def (size
, &rtl_zone
);
377 /* Initialize the normal SYMBOL_REF fields. */
378 memset (symbol
, 0, size
);
379 PUT_CODE (symbol
, SYMBOL_REF
);
380 PUT_MODE (symbol
, Pmode
);
381 XSTR (symbol
, 0) = label
;
382 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
384 /* Initialize the block_symbol stuff. */
385 SYMBOL_REF_BLOCK (symbol
) = block
;
386 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
391 /* Return a section with a particular name and with whatever SECTION_*
392 flags section_type_flags deems appropriate. The name of the section
393 is taken from NAME if nonnull, otherwise it is taken from DECL's
394 DECL_SECTION_NAME. DECL is the decl associated with the section
395 (see the section comment for details) and RELOC is as for
396 section_type_flags. */
399 get_named_section (tree decl
, const char *name
, int reloc
)
403 gcc_assert (!decl
|| DECL_P (decl
));
405 name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
407 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
409 return get_section (name
, flags
, decl
);
412 /* If required, set DECL_SECTION_NAME to a unique name. */
415 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
416 int flag_function_or_data_sections
)
418 if (DECL_SECTION_NAME (decl
) == NULL_TREE
419 && targetm
.have_named_sections
420 && (flag_function_or_data_sections
421 || DECL_ONE_ONLY (decl
)))
423 targetm
.asm_out
.unique_section (decl
, reloc
);
424 DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
) = true;
428 #ifdef BSS_SECTION_ASM_OP
430 #ifdef ASM_OUTPUT_BSS
432 /* Utility function for ASM_OUTPUT_BSS for targets to use if
433 they don't support alignments in .bss.
434 ??? It is believed that this function will work in most cases so such
435 support is localized here. */
437 static void ATTRIBUTE_UNUSED
438 asm_output_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
440 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
441 unsigned HOST_WIDE_INT rounded
)
443 gcc_assert (strcmp (XSTR (XEXP (DECL_RTL (decl
), 0), 0), name
) == 0);
444 targetm
.asm_out
.globalize_decl_name (file
, decl
);
445 switch_to_section (bss_section
);
446 #ifdef ASM_DECLARE_OBJECT_NAME
447 last_assemble_variable_decl
= decl
;
448 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
450 /* Standard thing is just output label for the object. */
451 ASM_OUTPUT_LABEL (file
, name
);
452 #endif /* ASM_DECLARE_OBJECT_NAME */
453 ASM_OUTPUT_SKIP (file
, rounded
? rounded
: 1);
458 #ifdef ASM_OUTPUT_ALIGNED_BSS
460 /* Utility function for targets to use in implementing
461 ASM_OUTPUT_ALIGNED_BSS.
462 ??? It is believed that this function will work in most cases so such
463 support is localized here. */
466 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
467 const char *name
, unsigned HOST_WIDE_INT size
,
470 switch_to_section (bss_section
);
471 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
472 #ifdef ASM_DECLARE_OBJECT_NAME
473 last_assemble_variable_decl
= decl
;
474 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
476 /* Standard thing is just output label for the object. */
477 ASM_OUTPUT_LABEL (file
, name
);
478 #endif /* ASM_DECLARE_OBJECT_NAME */
479 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
484 #endif /* BSS_SECTION_ASM_OP */
486 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
487 /* Return the hot section for function DECL. Return text_section for
491 hot_function_section (tree decl
)
493 if (decl
!= NULL_TREE
494 && DECL_SECTION_NAME (decl
) != NULL_TREE
495 && targetm
.have_named_sections
)
496 return get_named_section (decl
, NULL
, 0);
502 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
505 When DECL_SECTION_NAME is non-NULL and it is implicit section and
506 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
507 concatenate the name with NAMED_SECTION_SUFFIX.
508 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
511 get_named_text_section (tree decl
,
512 const char *text_section_name
,
513 const char *named_section_suffix
)
515 if (decl
&& DECL_SECTION_NAME (decl
))
517 if (named_section_suffix
)
519 tree dsn
= DECL_SECTION_NAME (decl
);
520 const char *stripped_name
;
523 name
= (char *) alloca (TREE_STRING_LENGTH (dsn
) + 1);
524 memcpy (name
, TREE_STRING_POINTER (dsn
),
525 TREE_STRING_LENGTH (dsn
) + 1);
527 stripped_name
= targetm
.strip_name_encoding (name
);
529 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
530 return get_named_section (decl
, buffer
, 0);
532 else if (DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
))
536 /* Do not try to split gnu_linkonce functions. This gets somewhat
538 if (DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
)
540 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
541 name
= targetm
.strip_name_encoding (name
);
542 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
548 return get_named_section (decl
, text_section_name
, 0);
551 /* Choose named function section based on its frequency. */
554 default_function_section (tree decl
, enum node_frequency freq
,
555 bool startup
, bool exit
)
557 if (!flag_reorder_functions
558 || !targetm
.have_named_sections
)
560 /* Startup code should go to startup subsection unless it is
561 unlikely executed (this happens especially with function splitting
562 where we can split away unnecesary parts of static constructors. */
563 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
564 return get_named_text_section (decl
, ".text.startup", NULL
);
566 /* Similarly for exit. */
567 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
568 return get_named_text_section (decl
, ".text.exit", NULL
);
570 /* Group cold functions together, similarly for hot code. */
573 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
574 return get_named_text_section (decl
, ".text.unlikely", NULL
);
575 case NODE_FREQUENCY_HOT
:
576 return get_named_text_section (decl
, ".text.hot", NULL
);
582 /* Return the section for function DECL.
584 If DECL is NULL_TREE, return the text section. We can be passed
585 NULL_TREE under some circumstances by dbxout.c at least.
587 If FORCE_COLD is true, return cold function section ignoring
588 the frequency info of cgraph_node. */
591 function_section_1 (tree decl
, bool force_cold
)
593 section
*section
= NULL
;
594 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
595 bool startup
= false, exit
= false;
599 struct cgraph_node
*node
= cgraph_node (decl
);
601 freq
= node
->frequency
;
602 startup
= node
->only_called_at_startup
;
603 exit
= node
->only_called_at_exit
;
606 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
608 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
609 if (decl
!= NULL_TREE
610 && DECL_SECTION_NAME (decl
) != NULL_TREE
)
612 if (targetm
.asm_out
.function_section
)
613 section
= targetm
.asm_out
.function_section (decl
, freq
,
617 return get_named_section (decl
, NULL
, 0);
620 return targetm
.asm_out
.select_section
621 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
624 if (targetm
.asm_out
.function_section
)
625 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
628 return hot_function_section (decl
);
632 /* Return the section for function DECL.
634 If DECL is NULL_TREE, return the text section. We can be passed
635 NULL_TREE under some circumstances by dbxout.c at least. */
638 function_section (tree decl
)
640 /* Handle cases where function splitting code decides
641 to put function entry point into unlikely executed section
642 despite the fact that the function itself is not cold
643 (i.e. it is called rarely but contains a hot loop that is
644 better to live in hot subsection for the code locality). */
645 return function_section_1 (decl
,
646 first_function_block_is_cold
);
649 /* Return the section for the current function, take IN_COLD_SECTION_P
653 current_function_section (void)
655 return function_section_1 (current_function_decl
, in_cold_section_p
);
658 /* Tell assembler to switch to unlikely-to-be-executed text section. */
661 unlikely_text_section (void)
663 return function_section_1 (current_function_decl
, true);
666 /* When called within a function context, return true if the function
667 has been assigned a cold text section and if SECT is that section.
668 When called outside a function context, return true if SECT is the
669 default cold section. */
672 unlikely_text_section_p (section
*sect
)
674 return sect
== function_section_1 (current_function_decl
, true);
677 /* Return the read-only data section associated with function DECL. */
680 default_function_rodata_section (tree decl
)
682 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
684 const char *name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
686 if (DECL_ONE_ONLY (decl
) && HAVE_COMDAT_GROUP
)
692 dot
= strchr (name
+ 1, '.');
695 len
= strlen (dot
) + 8;
696 rname
= (char *) alloca (len
);
698 strcpy (rname
, ".rodata");
700 return get_section (rname
, SECTION_LINKONCE
, decl
);
702 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
703 else if (DECL_ONE_ONLY (decl
)
704 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
706 size_t len
= strlen (name
) + 1;
707 char *rname
= (char *) alloca (len
);
709 memcpy (rname
, name
, len
);
711 return get_section (rname
, SECTION_LINKONCE
, decl
);
713 /* For .text.foo we want to use .rodata.foo. */
714 else if (flag_function_sections
&& flag_data_sections
715 && strncmp (name
, ".text.", 6) == 0)
717 size_t len
= strlen (name
) + 1;
718 char *rname
= (char *) alloca (len
+ 2);
720 memcpy (rname
, ".rodata", 7);
721 memcpy (rname
+ 7, name
+ 5, len
- 5);
722 return get_section (rname
, 0, decl
);
726 return readonly_data_section
;
729 /* Return the read-only data section associated with function DECL
730 for targets where that section should be always the single
731 readonly data section. */
734 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
736 return readonly_data_section
;
739 /* Return the section to use for string merging. */
742 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
743 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
744 unsigned int flags ATTRIBUTE_UNUSED
)
748 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
749 && TREE_CODE (decl
) == STRING_CST
750 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
752 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
753 && TREE_STRING_LENGTH (decl
) >= len
)
755 enum machine_mode mode
;
756 unsigned int modesize
;
762 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
763 modesize
= GET_MODE_BITSIZE (mode
);
764 if (modesize
>= 8 && modesize
<= 256
765 && (modesize
& (modesize
- 1)) == 0)
767 if (align
< modesize
)
770 str
= TREE_STRING_POINTER (decl
);
771 unit
= GET_MODE_SIZE (mode
);
773 /* Check for embedded NUL characters. */
774 for (i
= 0; i
< len
; i
+= unit
)
776 for (j
= 0; j
< unit
; j
++)
777 if (str
[i
+ j
] != '\0')
784 sprintf (name
, ".rodata.str%d.%d", modesize
/ 8,
786 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
787 return get_section (name
, flags
, NULL
);
792 return readonly_data_section
;
795 /* Return the section to use for constant merging. */
798 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
799 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
800 unsigned int flags ATTRIBUTE_UNUSED
)
802 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
804 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
810 && (align
& (align
- 1)) == 0)
814 sprintf (name
, ".rodata.cst%d", (int) (align
/ 8));
815 flags
|= (align
/ 8) | SECTION_MERGE
;
816 return get_section (name
, flags
, NULL
);
818 return readonly_data_section
;
821 /* Given NAME, a putative register name, discard any customary prefixes. */
824 strip_reg_name (const char *name
)
826 #ifdef REGISTER_PREFIX
827 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
828 name
+= strlen (REGISTER_PREFIX
);
830 if (name
[0] == '%' || name
[0] == '#')
835 /* The user has asked for a DECL to have a particular name. Set (or
836 change) it in such a way that we don't prefix an underscore to
839 set_user_assembler_name (tree decl
, const char *name
)
841 char *starred
= (char *) alloca (strlen (name
) + 2);
843 strcpy (starred
+ 1, name
);
844 change_decl_assembler_name (decl
, get_identifier (starred
));
845 SET_DECL_RTL (decl
, NULL_RTX
);
848 /* Decode an `asm' spec for a declaration as a register name.
849 Return the register number, or -1 if nothing specified,
850 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
851 or -3 if ASMSPEC is `cc' and is not recognized,
852 or -4 if ASMSPEC is `memory' and is not recognized.
853 Accept an exact spelling or a decimal number.
854 Prefixes such as % are optional. */
857 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
859 /* Presume just one register is clobbered. */
866 /* Get rid of confusing prefixes. */
867 asmspec
= strip_reg_name (asmspec
);
869 /* Allow a decimal number as a "register name". */
870 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
871 if (! ISDIGIT (asmspec
[i
]))
873 if (asmspec
[0] != 0 && i
< 0)
876 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0)
882 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
884 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
887 #ifdef OVERLAPPING_REGISTER_NAMES
891 const char *const name
;
894 } table
[] = OVERLAPPING_REGISTER_NAMES
;
896 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
898 && ! strcmp (asmspec
, table
[i
].name
))
900 *pnregs
= table
[i
].nregs
;
901 return table
[i
].number
;
904 #endif /* OVERLAPPING_REGISTER_NAMES */
906 #ifdef ADDITIONAL_REGISTER_NAMES
908 static const struct { const char *const name
; const int number
; } table
[]
909 = ADDITIONAL_REGISTER_NAMES
;
911 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
913 && ! strcmp (asmspec
, table
[i
].name
))
914 return table
[i
].number
;
916 #endif /* ADDITIONAL_REGISTER_NAMES */
918 if (!strcmp (asmspec
, "memory"))
921 if (!strcmp (asmspec
, "cc"))
931 decode_reg_name (const char *name
)
934 return decode_reg_name_and_count (name
, &count
);
938 /* Return true if DECL's initializer is suitable for a BSS section. */
941 bss_initializer_p (const_tree decl
)
943 return (DECL_INITIAL (decl
) == NULL
944 || DECL_INITIAL (decl
) == error_mark_node
945 || (flag_zero_initialized_in_bss
946 /* Leave constant zeroes in .rodata so they
948 && !TREE_READONLY (decl
)
949 && initializer_zerop (DECL_INITIAL (decl
))));
952 /* Compute the alignment of variable specified by DECL.
953 DONT_OUTPUT_DATA is from assemble_variable. */
956 align_variable (tree decl
, bool dont_output_data
)
958 unsigned int align
= DECL_ALIGN (decl
);
960 /* In the case for initialing an array whose length isn't specified,
961 where we have not yet been able to do the layout,
962 figure out the proper alignment now. */
963 if (dont_output_data
&& DECL_SIZE (decl
) == 0
964 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
965 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
967 /* Some object file formats have a maximum alignment which they support.
968 In particular, a.out format supports a maximum alignment of 4. */
969 if (align
> MAX_OFILE_ALIGNMENT
)
971 warning (0, "alignment of %q+D is greater than maximum object "
972 "file alignment. Using %d", decl
,
973 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
974 align
= MAX_OFILE_ALIGNMENT
;
977 /* On some machines, it is good to increase alignment sometimes. */
978 if (! DECL_USER_ALIGN (decl
))
980 #ifdef DATA_ALIGNMENT
981 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
982 /* Don't increase alignment too much for TLS variables - TLS space
984 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
987 #ifdef CONSTANT_ALIGNMENT
988 if (DECL_INITIAL (decl
) != 0 && DECL_INITIAL (decl
) != error_mark_node
)
990 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
992 /* Don't increase alignment too much for TLS variables - TLS space
994 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1000 /* Reset the alignment in case we have made it tighter, so we can benefit
1001 from it in get_pointer_alignment. */
1002 DECL_ALIGN (decl
) = align
;
1005 /* Return the section into which the given VAR_DECL or CONST_DECL
1006 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1007 section should be used wherever possible. */
1010 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1012 addr_space_t as
= ADDR_SPACE_GENERIC
;
1015 if (TREE_TYPE (decl
) != error_mark_node
)
1016 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1018 if (DECL_COMMON (decl
))
1020 /* If the decl has been given an explicit section name, or it resides
1021 in a non-generic address space, then it isn't common, and shouldn't
1022 be handled as such. */
1023 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1024 && ADDR_SPACE_GENERIC_P (as
));
1025 if (DECL_THREAD_LOCAL_P (decl
))
1026 return tls_comm_section
;
1027 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1028 return comm_section
;
1031 if (DECL_INITIAL (decl
) == error_mark_node
)
1032 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1033 else if (DECL_INITIAL (decl
))
1034 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1038 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1039 if (IN_NAMED_SECTION (decl
))
1040 return get_named_section (decl
, NULL
, reloc
);
1042 if (ADDR_SPACE_GENERIC_P (as
)
1043 && !DECL_THREAD_LOCAL_P (decl
)
1044 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1045 && bss_initializer_p (decl
))
1047 if (!TREE_PUBLIC (decl
))
1048 return lcomm_section
;
1049 if (bss_noswitch_section
)
1050 return bss_noswitch_section
;
1053 return targetm
.asm_out
.select_section (decl
, reloc
, DECL_ALIGN (decl
));
1056 /* Return the block into which object_block DECL should be placed. */
1058 static struct object_block
*
1059 get_block_for_decl (tree decl
)
1063 if (TREE_CODE (decl
) == VAR_DECL
)
1065 /* The object must be defined in this translation unit. */
1066 if (DECL_EXTERNAL (decl
))
1069 /* There's no point using object blocks for something that is
1070 isolated by definition. */
1071 if (DECL_ONE_ONLY (decl
))
1075 /* We can only calculate block offsets if the decl has a known
1077 if (DECL_SIZE_UNIT (decl
) == NULL
)
1079 if (!host_integerp (DECL_SIZE_UNIT (decl
), 1))
1082 /* Find out which section should contain DECL. We cannot put it into
1083 an object block if it requires a standalone definition. */
1084 if (TREE_CODE (decl
) == VAR_DECL
)
1085 align_variable (decl
, 0);
1086 sect
= get_variable_section (decl
, true);
1087 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1090 return get_block_for_section (sect
);
1093 /* Make sure block symbol SYMBOL is in block BLOCK. */
1096 change_symbol_block (rtx symbol
, struct object_block
*block
)
1098 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1100 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1101 SYMBOL_REF_BLOCK (symbol
) = block
;
1105 /* Return true if it is possible to put DECL in an object_block. */
1108 use_blocks_for_decl_p (tree decl
)
1110 /* Only data DECLs can be placed into object blocks. */
1111 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1114 /* Detect decls created by dw2_force_const_mem. Such decls are
1115 special because DECL_INITIAL doesn't specify the decl's true value.
1116 dw2_output_indirect_constants will instead call assemble_variable
1117 with dont_output_data set to 1 and then print the contents itself. */
1118 if (DECL_INITIAL (decl
) == decl
)
1121 /* If this decl is an alias, then we don't want to emit a
1123 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)))
1129 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1130 have static storage duration. In other words, it should not be an
1131 automatic variable, including PARM_DECLs.
1133 There is, however, one exception: this function handles variables
1134 explicitly placed in a particular register by the user.
1136 This is never called for PARM_DECL nodes. */
1139 make_decl_rtl (tree decl
)
1141 const char *name
= 0;
1145 /* Check that we are not being given an automatic variable. */
1146 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1147 && TREE_CODE (decl
) != RESULT_DECL
);
1149 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1150 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1151 || TREE_STATIC (decl
)
1152 || TREE_PUBLIC (decl
)
1153 || DECL_EXTERNAL (decl
)
1154 || DECL_REGISTER (decl
));
1156 /* And that we were not given a type or a label. */
1157 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1158 && TREE_CODE (decl
) != LABEL_DECL
);
1160 /* For a duplicate declaration, we can be called twice on the
1161 same DECL node. Don't discard the RTL already made. */
1162 if (DECL_RTL_SET_P (decl
))
1164 /* If the old RTL had the wrong mode, fix the mode. */
1165 x
= DECL_RTL (decl
);
1166 if (GET_MODE (x
) != DECL_MODE (decl
))
1167 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1169 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1172 /* ??? Another way to do this would be to maintain a hashed
1173 table of such critters. Instead of adding stuff to a DECL
1174 to give certain attributes to it, we could use an external
1175 hash map from DECL to set of attributes. */
1177 /* Let the target reassign the RTL if it wants.
1178 This is necessary, for example, when one machine specific
1179 decl attribute overrides another. */
1180 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1182 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1183 on the new decl information. */
1185 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1186 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1187 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1189 /* Make this function static known to the mudflap runtime. */
1190 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1191 mudflap_enqueue_decl (decl
);
1196 /* If this variable belongs to the global constant pool, retrieve the
1197 pre-computed RTL or recompute it in LTO mode. */
1198 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_IN_CONSTANT_POOL (decl
))
1200 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1204 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
1206 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1207 && DECL_REGISTER (decl
))
1209 error ("register name not specified for %q+D", decl
);
1211 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1213 const char *asmspec
= name
+1;
1214 reg_number
= decode_reg_name (asmspec
);
1215 /* First detect errors in declaring global registers. */
1216 if (reg_number
== -1)
1217 error ("register name not specified for %q+D", decl
);
1218 else if (reg_number
< 0)
1219 error ("invalid register name for %q+D", decl
);
1220 else if (TYPE_MODE (TREE_TYPE (decl
)) == BLKmode
)
1221 error ("data type of %q+D isn%'t suitable for a register",
1223 else if (! HARD_REGNO_MODE_OK (reg_number
, TYPE_MODE (TREE_TYPE (decl
))))
1224 error ("register specified for %q+D isn%'t suitable for data type",
1226 /* Now handle properly declared static register variables. */
1231 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1233 DECL_INITIAL (decl
) = 0;
1234 error ("global register variable has initial value");
1236 if (TREE_THIS_VOLATILE (decl
))
1237 warning (OPT_Wvolatile_register_var
,
1238 "optimization may eliminate reads and/or "
1239 "writes to register variables");
1241 /* If the user specified one of the eliminables registers here,
1242 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1243 confused with that register and be eliminated. This usage is
1244 somewhat suspect... */
1246 SET_DECL_RTL (decl
, gen_rtx_raw_REG (DECL_MODE (decl
), reg_number
));
1247 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1248 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1250 if (TREE_STATIC (decl
))
1252 /* Make this register global, so not usable for anything
1254 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1255 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1256 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1258 nregs
= hard_regno_nregs
[reg_number
][DECL_MODE (decl
)];
1260 globalize_reg (reg_number
+ --nregs
);
1263 /* As a register variable, it has no section. */
1267 /* Now handle ordinary static variables and functions (in memory).
1268 Also handle vars declared register invalidly. */
1269 else if (name
[0] == '*')
1271 #ifdef REGISTER_PREFIX
1272 if (strlen (REGISTER_PREFIX
) != 0)
1274 reg_number
= decode_reg_name (name
);
1275 if (reg_number
>= 0 || reg_number
== -3)
1276 error ("register name given for non-register variable %q+D", decl
);
1281 /* Specifying a section attribute on a variable forces it into a
1282 non-.bss section, and thus it cannot be common. */
1283 /* FIXME: In general this code should not be necessary because
1284 visibility pass is doing the same work. But notice_global_symbol
1285 is called early and it needs to make DECL_RTL to get the name.
1286 we take care of recomputing the DECL_RTL after visibility is changed. */
1287 if (TREE_CODE (decl
) == VAR_DECL
1288 && DECL_SECTION_NAME (decl
) != NULL_TREE
1289 && DECL_INITIAL (decl
) == NULL_TREE
1290 && DECL_COMMON (decl
))
1291 DECL_COMMON (decl
) = 0;
1293 /* Variables can't be both common and weak. */
1294 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1295 DECL_COMMON (decl
) = 0;
1297 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1298 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1301 enum machine_mode address_mode
= Pmode
;
1302 if (TREE_TYPE (decl
) != error_mark_node
)
1304 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1305 address_mode
= targetm
.addr_space
.address_mode (as
);
1307 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1309 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1310 SET_SYMBOL_REF_DECL (x
, decl
);
1312 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1313 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1314 set_mem_attributes (x
, decl
, 1);
1315 SET_DECL_RTL (decl
, x
);
1317 /* Optionally set flags or add text to the name to record information
1318 such as that it is a function name.
1319 If the name is changed, the macro ASM_OUTPUT_LABELREF
1320 will have to know how to strip this information. */
1321 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1323 /* Make this function static known to the mudflap runtime. */
1324 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1325 mudflap_enqueue_decl (decl
);
1328 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1329 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1333 make_decl_rtl_for_debug (tree decl
)
1335 unsigned int save_aliasing_flag
, save_mudflap_flag
;
1338 if (DECL_RTL_SET_P (decl
))
1339 return DECL_RTL (decl
);
1341 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1342 call new_alias_set. If running with -fcompare-debug, sometimes
1343 we do not want to create alias sets that will throw the alias
1344 numbers off in the comparison dumps. So... clearing
1345 flag_strict_aliasing will keep new_alias_set() from creating a
1346 new set. It is undesirable to register decl with mudflap
1347 in this case as well. */
1348 save_aliasing_flag
= flag_strict_aliasing
;
1349 flag_strict_aliasing
= 0;
1350 save_mudflap_flag
= flag_mudflap
;
1353 rtl
= DECL_RTL (decl
);
1354 /* Reset DECL_RTL back, as various parts of the compiler expects
1355 DECL_RTL set meaning it is actually going to be output. */
1356 SET_DECL_RTL (decl
, NULL
);
1358 flag_strict_aliasing
= save_aliasing_flag
;
1359 flag_mudflap
= save_mudflap_flag
;
1364 /* Output a string of literal assembler code
1365 for an `asm' keyword used between functions. */
1368 assemble_asm (tree string
)
1372 if (TREE_CODE (string
) == ADDR_EXPR
)
1373 string
= TREE_OPERAND (string
, 0);
1375 fprintf (asm_out_file
, "\t%s\n", TREE_STRING_POINTER (string
));
1378 /* Record an element in the table of global destructors. SYMBOL is
1379 a SYMBOL_REF of the function to be called; PRIORITY is a number
1380 between 0 and MAX_INIT_PRIORITY. */
1383 default_stabs_asm_out_destructor (rtx symbol ATTRIBUTE_UNUSED
,
1384 int priority ATTRIBUTE_UNUSED
)
1386 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1387 /* Tell GNU LD that this is part of the static destructor set.
1388 This will work for any system that uses stabs, most usefully
1390 dbxout_begin_simple_stabs ("___DTOR_LIST__", 22 /* N_SETT */);
1391 dbxout_stab_value_label (XSTR (symbol
, 0));
1393 sorry ("global destructors not supported on this target");
1397 /* Write the address of the entity given by SYMBOL to SEC. */
1399 assemble_addr_to_section (rtx symbol
, section
*sec
)
1401 switch_to_section (sec
);
1402 assemble_align (POINTER_SIZE
);
1403 assemble_integer (symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1406 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1407 not) section for PRIORITY. */
1409 get_cdtor_priority_section (int priority
, bool constructor_p
)
1413 /* ??? This only works reliably with the GNU linker. */
1414 sprintf (buf
, "%s.%.5u",
1415 constructor_p
? ".ctors" : ".dtors",
1416 /* Invert the numbering so the linker puts us in the proper
1417 order; constructors are run from right to left, and the
1418 linker sorts in increasing order. */
1419 MAX_INIT_PRIORITY
- priority
);
1420 return get_section (buf
, SECTION_WRITE
, NULL
);
1424 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1428 if (priority
!= DEFAULT_INIT_PRIORITY
)
1429 sec
= get_cdtor_priority_section (priority
,
1430 /*constructor_p=*/false);
1432 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1434 assemble_addr_to_section (symbol
, sec
);
1437 #ifdef DTORS_SECTION_ASM_OP
1439 default_dtor_section_asm_out_destructor (rtx symbol
,
1440 int priority ATTRIBUTE_UNUSED
)
1442 assemble_addr_to_section (symbol
, dtors_section
);
1446 /* Likewise for global constructors. */
1449 default_stabs_asm_out_constructor (rtx symbol ATTRIBUTE_UNUSED
,
1450 int priority ATTRIBUTE_UNUSED
)
1452 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1453 /* Tell GNU LD that this is part of the static destructor set.
1454 This will work for any system that uses stabs, most usefully
1456 dbxout_begin_simple_stabs ("___CTOR_LIST__", 22 /* N_SETT */);
1457 dbxout_stab_value_label (XSTR (symbol
, 0));
1459 sorry ("global constructors not supported on this target");
1464 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1468 if (priority
!= DEFAULT_INIT_PRIORITY
)
1469 sec
= get_cdtor_priority_section (priority
,
1470 /*constructor_p=*/true);
1472 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1474 assemble_addr_to_section (symbol
, sec
);
1477 #ifdef CTORS_SECTION_ASM_OP
1479 default_ctor_section_asm_out_constructor (rtx symbol
,
1480 int priority ATTRIBUTE_UNUSED
)
1482 assemble_addr_to_section (symbol
, ctors_section
);
1486 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1487 a nonzero value if the constant pool should be output before the
1488 start of the function, or a zero value if the pool should output
1489 after the end of the function. The default is to put it before the
1492 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1493 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1496 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1497 to be output to assembler.
1498 Set first_global_object_name and weak_global_object_name as appropriate. */
1501 notice_global_symbol (tree decl
)
1503 const char **type
= &first_global_object_name
;
1505 if (first_global_object_name
1506 || !TREE_PUBLIC (decl
)
1507 || DECL_EXTERNAL (decl
)
1508 || !DECL_NAME (decl
)
1509 || (TREE_CODE (decl
) != FUNCTION_DECL
1510 && (TREE_CODE (decl
) != VAR_DECL
1511 || (DECL_COMMON (decl
)
1512 && (DECL_INITIAL (decl
) == 0
1513 || DECL_INITIAL (decl
) == error_mark_node
))))
1514 || !MEM_P (DECL_RTL (decl
)))
1517 /* We win when global object is found, but it is useful to know about weak
1518 symbol as well so we can produce nicer unique names. */
1519 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1520 type
= &weak_global_object_name
;
1526 rtx decl_rtl
= DECL_RTL (decl
);
1528 p
= targetm
.strip_name_encoding (XSTR (XEXP (decl_rtl
, 0), 0));
1529 name
= ggc_strdup (p
);
1535 /* Output assembler code for the constant pool of a function and associated
1536 with defining the name of the function. DECL describes the function.
1537 NAME is the function's name. For the constant pool, we use the current
1538 constant pool data. */
1541 assemble_start_function (tree decl
, const char *fnname
)
1544 char tmp_label
[100];
1545 bool hot_label_written
= false;
1547 first_function_block_is_cold
= false;
1548 if (flag_reorder_blocks_and_partition
)
1550 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1551 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1552 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1553 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1554 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1555 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1556 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1557 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1562 crtl
->subsections
.hot_section_label
= NULL
;
1563 crtl
->subsections
.cold_section_label
= NULL
;
1564 crtl
->subsections
.hot_section_end_label
= NULL
;
1565 crtl
->subsections
.cold_section_end_label
= NULL
;
1568 /* The following code does not need preprocessing in the assembler. */
1572 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1573 output_constant_pool (fnname
, decl
);
1575 /* Make sure the not and cold text (code) sections are properly
1576 aligned. This is necessary here in the case where the function
1577 has both hot and cold sections, because we don't want to re-set
1578 the alignment when the section switch happens mid-function. */
1580 if (flag_reorder_blocks_and_partition
)
1582 switch_to_section (unlikely_text_section ());
1583 assemble_align (DECL_ALIGN (decl
));
1584 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1586 /* When the function starts with a cold section, we need to explicitly
1587 align the hot section and write out the hot section label.
1588 But if the current function is a thunk, we do not have a CFG. */
1590 && BB_PARTITION (ENTRY_BLOCK_PTR
->next_bb
) == BB_COLD_PARTITION
)
1592 switch_to_section (text_section
);
1593 assemble_align (DECL_ALIGN (decl
));
1594 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1595 hot_label_written
= true;
1596 first_function_block_is_cold
= true;
1599 else if (DECL_SECTION_NAME (decl
))
1601 /* Calls to function_section rely on first_function_block_is_cold
1603 first_function_block_is_cold
1604 = (cgraph_node (current_function_decl
)->frequency
1605 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1608 in_cold_section_p
= first_function_block_is_cold
;
1610 /* Switch to the correct text section for the start of the function. */
1612 switch_to_section (function_section (decl
));
1613 if (flag_reorder_blocks_and_partition
1614 && !hot_label_written
)
1615 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1617 /* Tell assembler to move to target machine's alignment for functions. */
1618 align
= floor_log2 (DECL_ALIGN (decl
) / BITS_PER_UNIT
);
1621 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1624 /* Handle a user-specified function alignment.
1625 Note that we still need to align to DECL_ALIGN, as above,
1626 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1627 if (! DECL_USER_ALIGN (decl
)
1628 && align_functions_log
> align
1629 && optimize_function_for_speed_p (cfun
))
1631 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1632 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1633 align_functions_log
, align_functions
- 1);
1635 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1639 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1640 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1643 if (!DECL_IGNORED_P (decl
))
1644 (*debug_hooks
->begin_function
) (decl
);
1646 /* Make function name accessible from other files, if appropriate. */
1648 if (TREE_PUBLIC (decl
))
1650 notice_global_symbol (decl
);
1652 globalize_decl (decl
);
1654 maybe_assemble_visibility (decl
);
1657 if (DECL_PRESERVE_P (decl
))
1658 targetm
.asm_out
.mark_decl_preserved (fnname
);
1660 /* Do any machine/system dependent processing of the function name. */
1661 #ifdef ASM_DECLARE_FUNCTION_NAME
1662 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1664 /* Standard thing is just output label for the function. */
1665 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1666 #endif /* ASM_DECLARE_FUNCTION_NAME */
1668 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1669 saw_no_split_stack
= true;
1672 /* Output assembler code associated with defining the size of the
1673 function. DECL describes the function. NAME is the function's name. */
1676 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1678 #ifdef ASM_DECLARE_FUNCTION_SIZE
1679 /* We could have switched section in the middle of the function. */
1680 if (flag_reorder_blocks_and_partition
)
1681 switch_to_section (function_section (decl
));
1682 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1684 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1686 output_constant_pool (fnname
, decl
);
1687 switch_to_section (function_section (decl
)); /* need to switch back */
1689 /* Output labels for end of hot/cold text sections (to be used by
1691 if (flag_reorder_blocks_and_partition
)
1693 section
*save_text_section
;
1695 save_text_section
= in_section
;
1696 switch_to_section (unlikely_text_section ());
1697 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1698 if (first_function_block_is_cold
)
1699 switch_to_section (text_section
);
1701 switch_to_section (function_section (decl
));
1702 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1703 switch_to_section (save_text_section
);
1707 /* Assemble code to leave SIZE bytes of zeros. */
1710 assemble_zeros (unsigned HOST_WIDE_INT size
)
1712 /* Do no output if -fsyntax-only. */
1713 if (flag_syntax_only
)
1716 #ifdef ASM_NO_SKIP_IN_TEXT
1717 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1718 so we must output 0s explicitly in the text section. */
1719 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1721 unsigned HOST_WIDE_INT i
;
1722 for (i
= 0; i
< size
; i
++)
1723 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1728 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1731 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1734 assemble_align (int align
)
1736 if (align
> BITS_PER_UNIT
)
1738 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1742 /* Assemble a string constant with the specified C string as contents. */
1745 assemble_string (const char *p
, int size
)
1750 /* If the string is very long, split it up. */
1754 int thissize
= size
- pos
;
1755 if (thissize
> maximum
)
1758 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1766 /* A noswitch_section_callback for lcomm_section. */
1769 emit_local (tree decl ATTRIBUTE_UNUSED
,
1770 const char *name ATTRIBUTE_UNUSED
,
1771 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1772 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1774 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1775 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1776 size
, DECL_ALIGN (decl
));
1778 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1779 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1782 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1787 /* A noswitch_section_callback for bss_noswitch_section. */
1789 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
1791 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1792 const char *name ATTRIBUTE_UNUSED
,
1793 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1794 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1796 #if defined ASM_OUTPUT_ALIGNED_BSS
1797 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
, DECL_ALIGN (decl
));
1800 ASM_OUTPUT_BSS (asm_out_file
, decl
, name
, size
, rounded
);
1806 /* A noswitch_section_callback for comm_section. */
1809 emit_common (tree decl ATTRIBUTE_UNUSED
,
1810 const char *name ATTRIBUTE_UNUSED
,
1811 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1812 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1814 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1815 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1816 size
, DECL_ALIGN (decl
));
1818 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1819 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1822 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1827 /* A noswitch_section_callback for tls_comm_section. */
1830 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1831 const char *name ATTRIBUTE_UNUSED
,
1832 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1833 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1835 #ifdef ASM_OUTPUT_TLS_COMMON
1836 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
1839 sorry ("thread-local COMMON data not implemented");
1844 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1845 NAME is the name of DECL's SYMBOL_REF. */
1848 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
)
1850 unsigned HOST_WIDE_INT size
, rounded
;
1852 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
1855 /* Don't allocate zero bytes of common,
1856 since that means "undefined external" in the linker. */
1860 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1861 so that each uninitialized object starts on such a boundary. */
1862 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
1863 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
1864 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
1866 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
1867 && (unsigned HOST_WIDE_INT
) DECL_ALIGN_UNIT (decl
) > rounded
)
1868 warning (0, "requested alignment for %q+D is greater than "
1869 "implemented alignment of %wu", decl
, rounded
);
1872 /* A subroutine of assemble_variable. Output the label and contents of
1873 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1874 is as for assemble_variable. */
1877 assemble_variable_contents (tree decl
, const char *name
,
1878 bool dont_output_data
)
1880 /* Do any machine/system dependent processing of the object. */
1881 #ifdef ASM_DECLARE_OBJECT_NAME
1882 last_assemble_variable_decl
= decl
;
1883 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
1885 /* Standard thing is just output label for the object. */
1886 ASM_OUTPUT_LABEL (asm_out_file
, name
);
1887 #endif /* ASM_DECLARE_OBJECT_NAME */
1889 if (!dont_output_data
)
1891 if (DECL_INITIAL (decl
)
1892 && DECL_INITIAL (decl
) != error_mark_node
1893 && !initializer_zerop (DECL_INITIAL (decl
)))
1894 /* Output the actual data. */
1895 output_constant (DECL_INITIAL (decl
),
1896 tree_low_cst (DECL_SIZE_UNIT (decl
), 1),
1899 /* Leave space for it. */
1900 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl
), 1));
1904 /* Assemble everything that is needed for a variable or function declaration.
1905 Not used for automatic variables, and not used for function definitions.
1906 Should not be called for variables of incomplete structure type.
1908 TOP_LEVEL is nonzero if this variable has file scope.
1909 AT_END is nonzero if this is the special handling, at end of compilation,
1910 to define things that have had only tentative definitions.
1911 DONT_OUTPUT_DATA if nonzero means don't actually output the
1912 initial value (that will be done by the caller). */
1915 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
1916 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
1919 rtx decl_rtl
, symbol
;
1922 /* This function is supposed to handle VARIABLES. Ensure we have one. */
1923 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
1925 /* Emulated TLS had better not get this far. */
1926 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
1928 last_assemble_variable_decl
= 0;
1930 /* Normally no need to say anything here for external references,
1931 since assemble_external is called by the language-specific code
1932 when a declaration is first seen. */
1934 if (DECL_EXTERNAL (decl
))
1937 /* Do nothing for global register variables. */
1938 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
1940 TREE_ASM_WRITTEN (decl
) = 1;
1944 /* If type was incomplete when the variable was declared,
1945 see if it is complete now. */
1947 if (DECL_SIZE (decl
) == 0)
1948 layout_decl (decl
, 0);
1950 /* Still incomplete => don't allocate it; treat the tentative defn
1951 (which is what it must have been) as an `extern' reference. */
1953 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
1955 error ("storage size of %q+D isn%'t known", decl
);
1956 TREE_ASM_WRITTEN (decl
) = 1;
1960 /* The first declaration of a variable that comes through this function
1961 decides whether it is global (in C, has external linkage)
1962 or local (in C, has internal linkage). So do nothing more
1963 if this function has already run. */
1965 if (TREE_ASM_WRITTEN (decl
))
1968 /* Make sure targetm.encode_section_info is invoked before we set
1970 decl_rtl
= DECL_RTL (decl
);
1972 TREE_ASM_WRITTEN (decl
) = 1;
1974 /* Do no output if -fsyntax-only. */
1975 if (flag_syntax_only
)
1978 if (! dont_output_data
1979 && ! host_integerp (DECL_SIZE_UNIT (decl
), 1))
1981 error ("size of variable %q+D is too large", decl
);
1985 gcc_assert (MEM_P (decl_rtl
));
1986 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
1987 symbol
= XEXP (decl_rtl
, 0);
1989 /* If this symbol belongs to the tree constant pool, output the constant
1990 if it hasn't already been written. */
1991 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
1993 tree decl
= SYMBOL_REF_DECL (symbol
);
1994 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
1995 output_constant_def_contents (symbol
);
2001 name
= XSTR (symbol
, 0);
2002 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2003 notice_global_symbol (decl
);
2005 /* Compute the alignment of this data. */
2007 align_variable (decl
, dont_output_data
);
2008 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2010 if (TREE_PUBLIC (decl
))
2011 maybe_assemble_visibility (decl
);
2013 if (DECL_PRESERVE_P (decl
))
2014 targetm
.asm_out
.mark_decl_preserved (name
);
2016 /* First make the assembler name(s) global if appropriate. */
2017 sect
= get_variable_section (decl
, false);
2018 if (TREE_PUBLIC (decl
)
2019 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2020 globalize_decl (decl
);
2022 /* Output any data that we will need to use the address of. */
2023 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2024 output_addressed_constants (DECL_INITIAL (decl
));
2026 /* dbxout.c needs to know this. */
2027 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2028 DECL_IN_TEXT_SECTION (decl
) = 1;
2030 /* If the decl is part of an object_block, make sure that the decl
2031 has been positioned within its block, but do not write out its
2032 definition yet. output_object_blocks will do that later. */
2033 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2035 gcc_assert (!dont_output_data
);
2036 place_block_symbol (symbol
);
2038 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2039 assemble_noswitch_variable (decl
, name
, sect
);
2042 switch_to_section (sect
);
2043 if (DECL_ALIGN (decl
) > BITS_PER_UNIT
)
2044 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (DECL_ALIGN_UNIT (decl
)));
2045 assemble_variable_contents (decl
, name
, dont_output_data
);
2049 /* Return 1 if type TYPE contains any pointers. */
2052 contains_pointers_p (tree type
)
2054 switch (TREE_CODE (type
))
2057 case REFERENCE_TYPE
:
2058 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2059 so I'll play safe and return 1. */
2065 case QUAL_UNION_TYPE
:
2068 /* For a type that has fields, see if the fields have pointers. */
2069 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2070 if (TREE_CODE (fields
) == FIELD_DECL
2071 && contains_pointers_p (TREE_TYPE (fields
)))
2077 /* An array type contains pointers if its element type does. */
2078 return contains_pointers_p (TREE_TYPE (type
));
2085 /* We delay assemble_external processing until
2086 the compilation unit is finalized. This is the best we can do for
2087 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2088 it all the way to final. See PR 17982 for further discussion. */
2089 static GTY(()) tree pending_assemble_externals
;
2091 #ifdef ASM_OUTPUT_EXTERNAL
2092 /* True if DECL is a function decl for which no out-of-line copy exists.
2093 It is assumed that DECL's assembler name has been set. */
2096 incorporeal_function_p (tree decl
)
2098 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2102 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2103 && DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
)
2106 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2107 if (is_builtin_name (name
))
2113 /* Actually do the tests to determine if this is necessary, and invoke
2114 ASM_OUTPUT_EXTERNAL. */
2116 assemble_external_real (tree decl
)
2118 rtx rtl
= DECL_RTL (decl
);
2120 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2121 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2122 && !incorporeal_function_p (decl
))
2124 /* Some systems do require some output. */
2125 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2126 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2132 process_pending_assemble_externals (void)
2134 #ifdef ASM_OUTPUT_EXTERNAL
2136 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2137 assemble_external_real (TREE_VALUE (list
));
2139 pending_assemble_externals
= 0;
2143 /* This TREE_LIST contains any weak symbol declarations waiting
2145 static GTY(()) tree weak_decls
;
2147 /* Output something to declare an external symbol to the assembler,
2148 and qualifiers such as weakness. (Most assemblers don't need
2149 extern declaration, so we normally output nothing.) Do nothing if
2150 DECL is not external. */
2153 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2155 /* Because most platforms do not define ASM_OUTPUT_EXTERNAL, the
2156 main body of this code is only rarely exercised. To provide some
2157 testing, on all platforms, we make sure that the ASM_OUT_FILE is
2158 open. If it's not, we should not be calling this function. */
2159 gcc_assert (asm_out_file
);
2161 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2164 /* We want to output annotation for weak and external symbols at
2165 very last to check if they are references or not. */
2167 if (TARGET_SUPPORTS_WEAK
2169 /* TREE_STATIC is a weird and abused creature which is not
2170 generally the right test for whether an entity has been
2171 locally emitted, inlined or otherwise not-really-extern, but
2172 for declarations that can be weak, it happens to be
2174 && !TREE_STATIC (decl
)
2175 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2176 && value_member (decl
, weak_decls
) == NULL_TREE
)
2177 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2179 #ifdef ASM_OUTPUT_EXTERNAL
2180 if (value_member (decl
, pending_assemble_externals
) == NULL_TREE
)
2181 pending_assemble_externals
= tree_cons (NULL
, decl
,
2182 pending_assemble_externals
);
2186 /* Similar, for calling a library function FUN. */
2189 assemble_external_libcall (rtx fun
)
2191 /* Declare library function name external when first used, if nec. */
2192 if (! SYMBOL_REF_USED (fun
))
2194 SYMBOL_REF_USED (fun
) = 1;
2195 targetm
.asm_out
.external_libcall (fun
);
2199 /* Assemble a label named NAME. */
2202 assemble_label (FILE *file
, const char *name
)
2204 ASM_OUTPUT_LABEL (file
, name
);
2207 /* Set the symbol_referenced flag for ID. */
2209 mark_referenced (tree id
)
2211 TREE_SYMBOL_REFERENCED (id
) = 1;
2214 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2216 mark_decl_referenced (tree decl
)
2218 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2220 /* Extern inline functions don't become needed when referenced.
2221 If we know a method will be emitted in other TU and no new
2222 functions can be marked reachable, just use the external
2224 struct cgraph_node
*node
= cgraph_node (decl
);
2225 if (!DECL_EXTERNAL (decl
)
2226 && (!node
->local
.vtable_method
|| !cgraph_global_info_ready
2227 || !node
->local
.finalized
))
2228 cgraph_mark_needed_node (node
);
2230 else if (TREE_CODE (decl
) == VAR_DECL
)
2232 struct varpool_node
*node
= varpool_node (decl
);
2233 varpool_mark_needed_node (node
);
2234 /* C++ frontend use mark_decl_references to force COMDAT variables
2235 to be output that might appear dead otherwise. */
2236 node
->force_output
= true;
2238 /* else do nothing - we can get various sorts of CST nodes here,
2239 which do not need to be marked. */
2243 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2244 until we find an identifier that is not itself a transparent alias.
2245 Modify the alias passed to it by reference (and all aliases on the
2246 way to the ultimate target), such that they do not have to be
2247 followed again, and return the ultimate target of the alias
2251 ultimate_transparent_alias_target (tree
*alias
)
2253 tree target
= *alias
;
2255 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
2257 gcc_assert (TREE_CHAIN (target
));
2258 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
2259 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
2260 && ! TREE_CHAIN (target
));
2267 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2268 starts with a *, the rest of NAME is output verbatim. Otherwise
2269 NAME is transformed in a target-specific way (usually by the
2270 addition of an underscore). */
2273 assemble_name_raw (FILE *file
, const char *name
)
2276 fputs (&name
[1], file
);
2278 ASM_OUTPUT_LABELREF (file
, name
);
2281 /* Like assemble_name_raw, but should be used when NAME might refer to
2282 an entity that is also represented as a tree (like a function or
2283 variable). If NAME does refer to such an entity, that entity will
2284 be marked as referenced. */
2287 assemble_name (FILE *file
, const char *name
)
2289 const char *real_name
;
2292 real_name
= targetm
.strip_name_encoding (name
);
2294 id
= maybe_get_identifier (real_name
);
2299 mark_referenced (id
);
2300 ultimate_transparent_alias_target (&id
);
2302 name
= IDENTIFIER_POINTER (id
);
2303 gcc_assert (! TREE_CHAIN (id
));
2306 assemble_name_raw (file
, name
);
2309 /* Allocate SIZE bytes writable static space with a gensym name
2310 and return an RTX to refer to its address. */
2313 assemble_static_space (unsigned HOST_WIDE_INT size
)
2316 const char *namestring
;
2319 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2321 namestring
= ggc_strdup (name
);
2323 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2324 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2326 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2327 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2330 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2331 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2334 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2335 so that each uninitialized object starts on such a boundary. */
2336 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2337 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2338 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2339 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2340 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2341 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2348 /* Assemble the static constant template for function entry trampolines.
2349 This is done at most once per compilation.
2350 Returns an RTX for the address of the template. */
2352 static GTY(()) rtx initial_trampoline
;
2355 assemble_trampoline_template (void)
2362 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2364 if (initial_trampoline
)
2365 return initial_trampoline
;
2367 /* By default, put trampoline templates in read-only data section. */
2369 #ifdef TRAMPOLINE_SECTION
2370 switch_to_section (TRAMPOLINE_SECTION
);
2372 switch_to_section (readonly_data_section
);
2375 /* Write the assembler code to define one. */
2376 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2378 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2380 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2381 targetm
.asm_out
.trampoline_template (asm_out_file
);
2383 /* Record the rtl to refer to it. */
2384 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2385 name
= ggc_strdup (label
);
2386 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2387 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2389 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2390 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2391 set_mem_size (initial_trampoline
, GEN_INT (TRAMPOLINE_SIZE
));
2393 return initial_trampoline
;
2396 /* A and B are either alignments or offsets. Return the minimum alignment
2397 that may be assumed after adding the two together. */
2399 static inline unsigned
2400 min_align (unsigned int a
, unsigned int b
)
2402 return (a
| b
) & -(a
| b
);
2405 /* Return the assembler directive for creating a given kind of integer
2406 object. SIZE is the number of bytes in the object and ALIGNED_P
2407 indicates whether it is known to be aligned. Return NULL if the
2408 assembly dialect has no such directive.
2410 The returned string should be printed at the start of a new line and
2411 be followed immediately by the object's initial value. */
2414 integer_asm_op (int size
, int aligned_p
)
2416 struct asm_int_op
*ops
;
2419 ops
= &targetm
.asm_out
.aligned_op
;
2421 ops
= &targetm
.asm_out
.unaligned_op
;
2426 return targetm
.asm_out
.byte_op
;
2440 /* Use directive OP to assemble an integer object X. Print OP at the
2441 start of the line, followed immediately by the value of X. */
2444 assemble_integer_with_op (const char *op
, rtx x
)
2446 fputs (op
, asm_out_file
);
2447 output_addr_const (asm_out_file
, x
);
2448 fputc ('\n', asm_out_file
);
2451 /* The default implementation of the asm_out.integer target hook. */
2454 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2455 unsigned int size ATTRIBUTE_UNUSED
,
2456 int aligned_p ATTRIBUTE_UNUSED
)
2458 const char *op
= integer_asm_op (size
, aligned_p
);
2459 /* Avoid GAS bugs for large values. Specifically negative values whose
2460 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2461 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE
/ BITS_PER_UNIT
)
2463 return op
&& (assemble_integer_with_op (op
, x
), true);
2466 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2467 the alignment of the integer in bits. Return 1 if we were able to output
2468 the constant, otherwise 0. We must be able to output the constant,
2469 if FORCE is nonzero. */
2472 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2476 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2478 /* See if the target hook can handle this kind of object. */
2479 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2482 /* If the object is a multi-byte one, try splitting it up. Split
2483 it into words it if is multi-word, otherwise split it into bytes. */
2486 enum machine_mode omode
, imode
;
2487 unsigned int subalign
;
2488 unsigned int subsize
, i
;
2489 enum mode_class mclass
;
2491 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2492 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2493 if (GET_CODE (x
) == CONST_FIXED
)
2494 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2498 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2499 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2501 for (i
= 0; i
< size
; i
+= subsize
)
2503 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2504 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2510 /* If we've printed some of it, but not all of it, there's no going
2515 gcc_assert (!force
);
2521 assemble_real (REAL_VALUE_TYPE d
, enum machine_mode mode
, unsigned int align
)
2523 long data
[4] = {0, 0, 0, 0};
2525 int bitsize
, nelts
, nunits
, units_per
;
2527 /* This is hairy. We have a quantity of known size. real_to_target
2528 will put it into an array of *host* longs, 32 bits per element
2529 (even if long is more than 32 bits). We need to determine the
2530 number of array elements that are occupied (nelts) and the number
2531 of *target* min-addressable units that will be occupied in the
2532 object file (nunits). We cannot assume that 32 divides the
2533 mode's bitsize (size * BITS_PER_UNIT) evenly.
2535 size * BITS_PER_UNIT is used here to make sure that padding bits
2536 (which might appear at either end of the value; real_to_target
2537 will include the padding bits in its output array) are included. */
2539 nunits
= GET_MODE_SIZE (mode
);
2540 bitsize
= nunits
* BITS_PER_UNIT
;
2541 nelts
= CEIL (bitsize
, 32);
2542 units_per
= 32 / BITS_PER_UNIT
;
2544 real_to_target (data
, &d
, mode
);
2546 /* Put out the first word with the specified alignment. */
2547 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2548 nunits
-= units_per
;
2550 /* Subsequent words need only 32-bit alignment. */
2551 align
= min_align (align
, 32);
2553 for (i
= 1; i
< nelts
; i
++)
2555 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2556 nunits
-= units_per
;
2560 /* Given an expression EXP with a constant value,
2561 reduce it to the sum of an assembler symbol and an integer.
2562 Store them both in the structure *VALUE.
2563 EXP must be reducible. */
2567 HOST_WIDE_INT offset
;
2571 decode_addr_const (tree exp
, struct addr_const
*value
)
2573 tree target
= TREE_OPERAND (exp
, 0);
2579 if (TREE_CODE (target
) == COMPONENT_REF
2580 && host_integerp (byte_position (TREE_OPERAND (target
, 1)), 0))
2582 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2583 target
= TREE_OPERAND (target
, 0);
2585 else if (TREE_CODE (target
) == ARRAY_REF
2586 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2588 offset
+= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target
)), 1)
2589 * tree_low_cst (TREE_OPERAND (target
, 1), 0));
2590 target
= TREE_OPERAND (target
, 0);
2592 else if (TREE_CODE (target
) == INDIRECT_REF
2593 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2594 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2596 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2601 switch (TREE_CODE (target
))
2605 x
= DECL_RTL (target
);
2609 x
= gen_rtx_MEM (FUNCTION_MODE
,
2610 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2619 x
= output_constant_def (target
, 1);
2626 gcc_assert (MEM_P (x
));
2630 value
->offset
= offset
;
2634 static GTY((param_is (struct constant_descriptor_tree
)))
2635 htab_t const_desc_htab
;
2637 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2639 /* Constant pool accessor function. */
2642 constant_pool_htab (void)
2644 return const_desc_htab
;
2647 /* Compute a hash code for a constant expression. */
2650 const_desc_hash (const void *ptr
)
2652 return ((const struct constant_descriptor_tree
*)ptr
)->hash
;
2656 const_hash_1 (const tree exp
)
2661 enum tree_code code
= TREE_CODE (exp
);
2663 /* Either set P and LEN to the address and len of something to hash and
2664 exit the switch or return a value. */
2669 p
= (char *) &TREE_INT_CST (exp
);
2670 len
= sizeof TREE_INT_CST (exp
);
2674 return real_hash (TREE_REAL_CST_PTR (exp
));
2677 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2680 p
= TREE_STRING_POINTER (exp
);
2681 len
= TREE_STRING_LENGTH (exp
);
2685 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2686 + const_hash_1 (TREE_IMAGPART (exp
)));
2692 hi
= 7 + TYPE_VECTOR_SUBPARTS (TREE_TYPE (exp
));
2694 for (link
= TREE_VECTOR_CST_ELTS (exp
); link
; link
= TREE_CHAIN (link
))
2695 hi
= hi
* 563 + const_hash_1 (TREE_VALUE (link
));
2702 unsigned HOST_WIDE_INT idx
;
2705 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2707 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2709 hi
= hi
* 603 + const_hash_1 (value
);
2717 struct addr_const value
;
2719 decode_addr_const (exp
, &value
);
2720 switch (GET_CODE (value
.base
))
2723 /* Don't hash the address of the SYMBOL_REF;
2724 only use the offset and the symbol name. */
2726 p
= XSTR (value
.base
, 0);
2727 for (i
= 0; p
[i
] != 0; i
++)
2728 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2732 hi
= value
.offset
+ CODE_LABEL_NUMBER (XEXP (value
.base
, 0)) * 13;
2742 case POINTER_PLUS_EXPR
:
2744 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2745 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2748 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2751 /* A language specific constant. Just hash the code. */
2755 /* Compute hashing function. */
2757 for (i
= 0; i
< len
; i
++)
2758 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2763 /* Wrapper of compare_constant, for the htab interface. */
2765 const_desc_eq (const void *p1
, const void *p2
)
2767 const struct constant_descriptor_tree
*const c1
2768 = (const struct constant_descriptor_tree
*) p1
;
2769 const struct constant_descriptor_tree
*const c2
2770 = (const struct constant_descriptor_tree
*) p2
;
2771 if (c1
->hash
!= c2
->hash
)
2773 return compare_constant (c1
->value
, c2
->value
);
2776 /* Compare t1 and t2, and return 1 only if they are known to result in
2777 the same bit pattern on output. */
2780 compare_constant (const tree t1
, const tree t2
)
2782 enum tree_code typecode
;
2784 if (t1
== NULL_TREE
)
2785 return t2
== NULL_TREE
;
2786 if (t2
== NULL_TREE
)
2789 if (TREE_CODE (t1
) != TREE_CODE (t2
))
2792 switch (TREE_CODE (t1
))
2795 /* Integer constants are the same only if the same width of type. */
2796 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2798 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2800 return tree_int_cst_equal (t1
, t2
);
2803 /* Real constants are the same only if the same width of type. */
2804 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2807 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
2810 /* Fixed constants are the same only if the same width of type. */
2811 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2814 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
2817 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2820 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
2821 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
2822 TREE_STRING_LENGTH (t1
)));
2825 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
2826 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
2832 if (TYPE_VECTOR_SUBPARTS (TREE_TYPE (t1
))
2833 != TYPE_VECTOR_SUBPARTS (TREE_TYPE (t2
)))
2836 link2
= TREE_VECTOR_CST_ELTS (t2
);
2837 for (link1
= TREE_VECTOR_CST_ELTS (t1
);
2839 link1
= TREE_CHAIN (link1
))
2841 if (!compare_constant (TREE_VALUE (link1
), TREE_VALUE (link2
)))
2843 link2
= TREE_CHAIN (link2
);
2851 VEC(constructor_elt
, gc
) *v1
, *v2
;
2852 unsigned HOST_WIDE_INT idx
;
2854 typecode
= TREE_CODE (TREE_TYPE (t1
));
2855 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
2858 if (typecode
== ARRAY_TYPE
)
2860 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
2861 /* For arrays, check that the sizes all match. */
2862 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
2864 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
2869 /* For record and union constructors, require exact type
2871 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
2875 v1
= CONSTRUCTOR_ELTS (t1
);
2876 v2
= CONSTRUCTOR_ELTS (t2
);
2877 if (VEC_length (constructor_elt
, v1
)
2878 != VEC_length (constructor_elt
, v2
))
2881 for (idx
= 0; idx
< VEC_length (constructor_elt
, v1
); ++idx
)
2883 constructor_elt
*c1
= VEC_index (constructor_elt
, v1
, idx
);
2884 constructor_elt
*c2
= VEC_index (constructor_elt
, v2
, idx
);
2886 /* Check that each value is the same... */
2887 if (!compare_constant (c1
->value
, c2
->value
))
2889 /* ... and that they apply to the same fields! */
2890 if (typecode
== ARRAY_TYPE
)
2892 if (!compare_constant (c1
->index
, c2
->index
))
2897 if (c1
->index
!= c2
->index
)
2908 struct addr_const value1
, value2
;
2912 decode_addr_const (t1
, &value1
);
2913 decode_addr_const (t2
, &value2
);
2915 if (value1
.offset
!= value2
.offset
)
2918 code
= GET_CODE (value1
.base
);
2919 if (code
!= GET_CODE (value2
.base
))
2925 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
2929 ret
= (CODE_LABEL_NUMBER (XEXP (value1
.base
, 0))
2930 == CODE_LABEL_NUMBER (XEXP (value2
.base
, 0)));
2940 case POINTER_PLUS_EXPR
:
2943 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
2944 && compare_constant(TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
2947 case VIEW_CONVERT_EXPR
:
2948 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
2957 /* Make a copy of the whole tree structure for a constant. This
2958 handles the same types of nodes that compare_constant handles. */
2961 copy_constant (tree exp
)
2963 switch (TREE_CODE (exp
))
2966 /* For ADDR_EXPR, we do not want to copy the decl whose address
2967 is requested. We do want to copy constants though. */
2968 if (CONSTANT_CLASS_P (TREE_OPERAND (exp
, 0)))
2969 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
2970 copy_constant (TREE_OPERAND (exp
, 0)));
2972 return copy_node (exp
);
2978 return copy_node (exp
);
2981 return build_complex (TREE_TYPE (exp
),
2982 copy_constant (TREE_REALPART (exp
)),
2983 copy_constant (TREE_IMAGPART (exp
)));
2986 case POINTER_PLUS_EXPR
:
2988 return build2 (TREE_CODE (exp
), TREE_TYPE (exp
),
2989 copy_constant (TREE_OPERAND (exp
, 0)),
2990 copy_constant (TREE_OPERAND (exp
, 1)));
2993 case VIEW_CONVERT_EXPR
:
2994 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
2995 copy_constant (TREE_OPERAND (exp
, 0)));
2998 return build_vector (TREE_TYPE (exp
),
2999 copy_list (TREE_VECTOR_CST_ELTS (exp
)));
3003 tree copy
= copy_node (exp
);
3004 VEC(constructor_elt
, gc
) *v
;
3005 unsigned HOST_WIDE_INT idx
;
3006 tree purpose
, value
;
3008 v
= VEC_alloc(constructor_elt
, gc
, VEC_length(constructor_elt
,
3009 CONSTRUCTOR_ELTS (exp
)));
3010 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp
), idx
, purpose
, value
)
3012 constructor_elt
*ce
= VEC_quick_push (constructor_elt
, v
, NULL
);
3013 ce
->index
= purpose
;
3014 ce
->value
= copy_constant (value
);
3016 CONSTRUCTOR_ELTS (copy
) = v
;
3025 /* Return the section into which constant EXP should be placed. */
3028 get_constant_section (tree exp
, unsigned int align
)
3030 return targetm
.asm_out
.select_section (exp
,
3031 compute_reloc_for_constant (exp
),
3035 /* Return the size of constant EXP in bytes. */
3037 static HOST_WIDE_INT
3038 get_constant_size (tree exp
)
3042 size
= int_size_in_bytes (TREE_TYPE (exp
));
3043 if (TREE_CODE (exp
) == STRING_CST
)
3044 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3048 /* Subroutine of output_constant_def:
3049 No constant equal to EXP is known to have been output.
3050 Make a constant descriptor to enter EXP in the hash table.
3051 Assign the label number and construct RTL to refer to the
3052 constant's location in memory.
3053 Caller is responsible for updating the hash table. */
3055 static struct constant_descriptor_tree
*
3056 build_constant_desc (tree exp
)
3058 struct constant_descriptor_tree
*desc
;
3064 desc
= ggc_alloc_constant_descriptor_tree ();
3065 desc
->value
= copy_constant (exp
);
3067 /* Propagate marked-ness to copied constant. */
3068 if (flag_mudflap
&& mf_marked_p (exp
))
3069 mf_mark (desc
->value
);
3071 /* Create a string containing the label name, in LABEL. */
3072 labelno
= const_labelno
++;
3073 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3075 /* Construct the VAR_DECL associated with the constant. */
3076 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3078 DECL_ARTIFICIAL (decl
) = 1;
3079 DECL_IGNORED_P (decl
) = 1;
3080 TREE_READONLY (decl
) = 1;
3081 TREE_STATIC (decl
) = 1;
3082 TREE_ADDRESSABLE (decl
) = 1;
3083 /* We don't set the RTL yet as this would cause varpool to assume that the
3084 variable is referenced. Moreover, it would just be dropped in LTO mode.
3085 Instead we set the flag that will be recognized in make_decl_rtl. */
3086 DECL_IN_CONSTANT_POOL (decl
) = 1;
3087 DECL_INITIAL (decl
) = desc
->value
;
3088 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3089 architectures so use DATA_ALIGNMENT as well, except for strings. */
3090 if (TREE_CODE (exp
) == STRING_CST
)
3092 #ifdef CONSTANT_ALIGNMENT
3093 DECL_ALIGN (decl
) = CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
));
3097 align_variable (decl
, 0);
3099 /* Now construct the SYMBOL_REF and the MEM. */
3100 if (use_object_blocks_p ())
3102 section
*sect
= get_constant_section (exp
, DECL_ALIGN (decl
));
3103 symbol
= create_block_symbol (ggc_strdup (label
),
3104 get_block_for_section (sect
), -1);
3107 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3108 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3109 SET_SYMBOL_REF_DECL (symbol
, decl
);
3110 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3112 rtl
= gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3113 set_mem_attributes (rtl
, exp
, 1);
3114 set_mem_alias_set (rtl
, 0);
3115 set_mem_alias_set (rtl
, const_alias_set
);
3117 /* We cannot share RTX'es in pool entries.
3118 Mark this piece of RTL as required for unsharing. */
3119 RTX_FLAG (rtl
, used
) = 1;
3121 /* Set flags or add text to the name to record information, such as
3122 that it is a local symbol. If the name is changed, the macro
3123 ASM_OUTPUT_LABELREF will have to know how to strip this
3124 information. This call might invalidate our local variable
3125 SYMBOL; we can't use it afterward. */
3126 targetm
.encode_section_info (exp
, rtl
, true);
3133 /* Return an rtx representing a reference to constant data in memory
3134 for the constant expression EXP.
3136 If assembler code for such a constant has already been output,
3137 return an rtx to refer to it.
3138 Otherwise, output such a constant in memory
3139 and generate an rtx for it.
3141 If DEFER is nonzero, this constant can be deferred and output only
3142 if referenced in the function after all optimizations.
3144 `const_desc_table' records which constants already have label strings. */
3147 output_constant_def (tree exp
, int defer
)
3149 struct constant_descriptor_tree
*desc
;
3150 struct constant_descriptor_tree key
;
3153 /* Look up EXP in the table of constant descriptors. If we didn't find
3154 it, create a new one. */
3156 key
.hash
= const_hash_1 (exp
);
3157 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3159 desc
= (struct constant_descriptor_tree
*) *loc
;
3162 desc
= build_constant_desc (exp
);
3163 desc
->hash
= key
.hash
;
3167 maybe_output_constant_def_contents (desc
, defer
);
3171 /* Subroutine of output_constant_def: Decide whether or not we need to
3172 output the constant DESC now, and if so, do it. */
3174 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3177 rtx symbol
= XEXP (desc
->rtl
, 0);
3178 tree exp
= desc
->value
;
3180 if (flag_syntax_only
)
3183 if (TREE_ASM_WRITTEN (exp
))
3184 /* Already output; don't do it again. */
3187 /* We can always defer constants as long as the context allows
3191 /* Increment n_deferred_constants if it exists. It needs to be at
3192 least as large as the number of constants actually referred to
3193 by the function. If it's too small we'll stop looking too early
3194 and fail to emit constants; if it's too large we'll only look
3195 through the entire function when we could have stopped earlier. */
3197 n_deferred_constants
++;
3201 output_constant_def_contents (symbol
);
3204 /* Subroutine of output_constant_def_contents. Output the definition
3205 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3206 constant's alignment in bits. */
3209 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3213 size
= get_constant_size (exp
);
3215 /* Do any machine/system dependent processing of the constant. */
3216 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3218 /* Output the value of EXP. */
3219 output_constant (exp
, size
, align
);
3222 /* We must output the constant data referred to by SYMBOL; do so. */
3225 output_constant_def_contents (rtx symbol
)
3227 tree decl
= SYMBOL_REF_DECL (symbol
);
3228 tree exp
= DECL_INITIAL (decl
);
3231 /* Make sure any other constants whose addresses appear in EXP
3232 are assigned label numbers. */
3233 output_addressed_constants (exp
);
3235 /* We are no longer deferring this constant. */
3236 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3238 /* If the constant is part of an object block, make sure that the
3239 decl has been positioned within its block, but do not write out
3240 its definition yet. output_object_blocks will do that later. */
3241 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3242 place_block_symbol (symbol
);
3245 align
= DECL_ALIGN (decl
);
3246 switch_to_section (get_constant_section (exp
, align
));
3247 if (align
> BITS_PER_UNIT
)
3248 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3249 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3252 mudflap_enqueue_constant (exp
);
3255 /* Look up EXP in the table of constant descriptors. Return the rtl
3256 if it has been emitted, else null. */
3259 lookup_constant_def (tree exp
)
3261 struct constant_descriptor_tree
*desc
;
3262 struct constant_descriptor_tree key
;
3265 key
.hash
= const_hash_1 (exp
);
3266 desc
= (struct constant_descriptor_tree
*)
3267 htab_find_with_hash (const_desc_htab
, &key
, key
.hash
);
3269 return (desc
? desc
->rtl
: NULL_RTX
);
3272 /* Return a tree representing a reference to constant data in memory
3273 for the constant expression EXP.
3275 This is the counterpart of output_constant_def at the Tree level. */
3278 tree_output_constant_def (tree exp
)
3280 struct constant_descriptor_tree
*desc
, key
;
3284 /* Look up EXP in the table of constant descriptors. If we didn't find
3285 it, create a new one. */
3287 key
.hash
= const_hash_1 (exp
);
3288 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3290 desc
= (struct constant_descriptor_tree
*) *loc
;
3293 desc
= build_constant_desc (exp
);
3294 desc
->hash
= key
.hash
;
3298 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3299 varpool_finalize_decl (decl
);
3303 /* Used in the hash tables to avoid outputting the same constant
3304 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3305 are output once per function, not once per file. */
3306 /* ??? Only a few targets need per-function constant pools. Most
3307 can use one per-file pool. Should add a targetm bit to tell the
3310 struct GTY(()) rtx_constant_pool
{
3311 /* Pointers to first and last constant in pool, as ordered by offset. */
3312 struct constant_descriptor_rtx
*first
;
3313 struct constant_descriptor_rtx
*last
;
3315 /* Hash facility for making memory-constants from constant rtl-expressions.
3316 It is used on RISC machines where immediate integer arguments and
3317 constant addresses are restricted so that such constants must be stored
3319 htab_t
GTY((param_is (struct constant_descriptor_rtx
))) const_rtx_htab
;
3321 /* Current offset in constant pool (does not include any
3322 machine-specific header). */
3323 HOST_WIDE_INT offset
;
3326 struct GTY((chain_next ("%h.next"))) constant_descriptor_rtx
{
3327 struct constant_descriptor_rtx
*next
;
3331 HOST_WIDE_INT offset
;
3333 enum machine_mode mode
;
3339 /* Hash and compare functions for const_rtx_htab. */
3342 const_desc_rtx_hash (const void *ptr
)
3344 const struct constant_descriptor_rtx
*const desc
3345 = (const struct constant_descriptor_rtx
*) ptr
;
3350 const_desc_rtx_eq (const void *a
, const void *b
)
3352 const struct constant_descriptor_rtx
*const x
3353 = (const struct constant_descriptor_rtx
*) a
;
3354 const struct constant_descriptor_rtx
*const y
3355 = (const struct constant_descriptor_rtx
*) b
;
3357 if (x
->mode
!= y
->mode
)
3359 return rtx_equal_p (x
->constant
, y
->constant
);
3362 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3365 const_rtx_hash_1 (rtx
*xp
, void *data
)
3367 unsigned HOST_WIDE_INT hwi
;
3368 enum machine_mode mode
;
3374 code
= GET_CODE (x
);
3375 mode
= GET_MODE (x
);
3376 h
= (hashval_t
) code
* 1048573 + mode
;
3384 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3385 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3388 h
^= (hashval_t
) hwi
;
3389 for (i
= 1; i
< n
; ++i
)
3392 h
^= (hashval_t
) hwi
;
3398 if (mode
== VOIDmode
)
3400 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3404 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3408 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3414 for (i
= XVECLEN (x
, 0); i
-- > 0; )
3415 h
= h
* 251 + const_rtx_hash_1 (&XVECEXP (x
, 0, i
), data
);
3420 h
^= htab_hash_string (XSTR (x
, 0));
3424 h
= h
* 251 + CODE_LABEL_NUMBER (XEXP (x
, 0));
3428 case UNSPEC_VOLATILE
:
3429 h
= h
* 251 + XINT (x
, 1);
3436 hp
= (hashval_t
*) data
;
3437 *hp
= *hp
* 509 + h
;
3441 /* Compute a hash value for X, which should be a constant. */
3444 const_rtx_hash (rtx x
)
3447 for_each_rtx (&x
, const_rtx_hash_1
, &h
);
3452 /* Create and return a new rtx constant pool. */
3454 static struct rtx_constant_pool
*
3455 create_constant_pool (void)
3457 struct rtx_constant_pool
*pool
;
3459 pool
= ggc_alloc_rtx_constant_pool ();
3460 pool
->const_rtx_htab
= htab_create_ggc (31, const_desc_rtx_hash
,
3461 const_desc_rtx_eq
, NULL
);
3468 /* Initialize constant pool hashing for a new function. */
3471 init_varasm_status (void)
3473 crtl
->varasm
.pool
= create_constant_pool ();
3474 crtl
->varasm
.deferred_constants
= 0;
3477 /* Given a MINUS expression, simplify it if both sides
3478 include the same symbol. */
3481 simplify_subtraction (rtx x
)
3483 rtx r
= simplify_rtx (x
);
3487 /* Given a constant rtx X, make (or find) a memory constant for its value
3488 and return a MEM rtx to refer to it in memory. */
3491 force_const_mem (enum machine_mode mode
, rtx x
)
3493 struct constant_descriptor_rtx
*desc
, tmp
;
3494 struct rtx_constant_pool
*pool
;
3501 /* If we're not allowed to drop X into the constant pool, don't. */
3502 if (targetm
.cannot_force_const_mem (x
))
3505 /* Record that this function has used a constant pool entry. */
3506 crtl
->uses_const_pool
= 1;
3508 /* Decide which pool to use. */
3509 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3510 ? shared_constant_pool
3511 : crtl
->varasm
.pool
);
3513 /* Lookup the value in the hashtable. */
3516 hash
= const_rtx_hash (x
);
3517 slot
= htab_find_slot_with_hash (pool
->const_rtx_htab
, &tmp
, hash
, INSERT
);
3518 desc
= (struct constant_descriptor_rtx
*) *slot
;
3520 /* If the constant was already present, return its memory. */
3522 return copy_rtx (desc
->mem
);
3524 /* Otherwise, create a new descriptor. */
3525 desc
= ggc_alloc_constant_descriptor_rtx ();
3528 /* Align the location counter as required by EXP's data type. */
3529 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3530 #ifdef CONSTANT_ALIGNMENT
3532 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3533 if (type
!= NULL_TREE
)
3534 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3538 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3539 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3542 desc
->constant
= copy_rtx (tmp
.constant
);
3543 desc
->offset
= pool
->offset
;
3546 desc
->align
= align
;
3547 desc
->labelno
= const_labelno
;
3550 pool
->offset
+= GET_MODE_SIZE (mode
);
3552 pool
->last
->next
= desc
;
3554 pool
->first
= pool
->last
= desc
;
3557 /* Create a string containing the label name, in LABEL. */
3558 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3561 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3562 the constants pool. */
3563 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3565 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3566 symbol
= create_block_symbol (ggc_strdup (label
),
3567 get_block_for_section (sect
), -1);
3570 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3572 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3573 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3574 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3576 /* Construct the MEM. */
3577 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3578 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3579 set_mem_align (def
, align
);
3581 /* If we're dropping a label to the constant pool, make sure we
3583 if (GET_CODE (x
) == LABEL_REF
)
3584 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3586 return copy_rtx (def
);
3589 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3592 get_pool_constant (rtx addr
)
3594 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3597 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3598 and whether it has been output or not. */
3601 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3603 struct constant_descriptor_rtx
*desc
;
3605 desc
= SYMBOL_REF_CONSTANT (addr
);
3606 *pmarked
= (desc
->mark
!= 0);
3607 return desc
->constant
;
3610 /* Similar, return the mode. */
3613 get_pool_mode (const_rtx addr
)
3615 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3618 /* Return the size of the constant pool. */
3621 get_pool_size (void)
3623 return crtl
->varasm
.pool
->offset
;
3626 /* Worker function for output_constant_pool_1. Emit assembly for X
3627 in MODE with known alignment ALIGN. */
3630 output_constant_pool_2 (enum machine_mode mode
, rtx x
, unsigned int align
)
3632 switch (GET_MODE_CLASS (mode
))
3635 case MODE_DECIMAL_FLOAT
:
3639 gcc_assert (GET_CODE (x
) == CONST_DOUBLE
);
3640 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3641 assemble_real (r
, mode
, align
);
3646 case MODE_PARTIAL_INT
:
3651 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3654 case MODE_VECTOR_FLOAT
:
3655 case MODE_VECTOR_INT
:
3656 case MODE_VECTOR_FRACT
:
3657 case MODE_VECTOR_UFRACT
:
3658 case MODE_VECTOR_ACCUM
:
3659 case MODE_VECTOR_UACCUM
:
3662 enum machine_mode submode
= GET_MODE_INNER (mode
);
3663 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3665 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3666 units
= CONST_VECTOR_NUNITS (x
);
3668 for (i
= 0; i
< units
; i
++)
3670 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3671 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3681 /* Worker function for output_constant_pool. Emit constant DESC,
3682 giving it ALIGN bits of alignment. */
3685 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3692 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3693 whose CODE_LABEL has been deleted. This can occur if a jump table
3694 is eliminated by optimization. If so, write a constant of zero
3695 instead. Note that this can also happen by turning the
3696 CODE_LABEL into a NOTE. */
3697 /* ??? This seems completely and utterly wrong. Certainly it's
3698 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3699 functioning even with INSN_DELETED_P and friends. */
3702 switch (GET_CODE (tmp
))
3705 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3706 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3708 tmp
= XEXP (XEXP (tmp
, 0), 0);
3712 tmp
= XEXP (tmp
, 0);
3713 gcc_assert (!INSN_DELETED_P (tmp
));
3714 gcc_assert (!NOTE_P (tmp
)
3715 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3722 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3723 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3724 align
, desc
->labelno
, done
);
3727 assemble_align (align
);
3729 /* Output the label. */
3730 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3732 /* Output the data. */
3733 output_constant_pool_2 (desc
->mode
, x
, align
);
3735 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3736 sections have proper size. */
3737 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3739 && (in_section
->common
.flags
& SECTION_MERGE
))
3740 assemble_align (align
);
3742 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3748 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3749 to as used. Emit referenced deferred strings. This function can
3750 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3753 mark_constant (rtx
*current_rtx
, void *data ATTRIBUTE_UNUSED
)
3755 rtx x
= *current_rtx
;
3757 if (x
== NULL_RTX
|| GET_CODE (x
) != SYMBOL_REF
)
3760 if (CONSTANT_POOL_ADDRESS_P (x
))
3762 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3763 if (desc
->mark
== 0)
3766 for_each_rtx (&desc
->constant
, mark_constant
, NULL
);
3769 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3771 tree decl
= SYMBOL_REF_DECL (x
);
3772 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
3774 n_deferred_constants
--;
3775 output_constant_def_contents (x
);
3782 /* Look through appropriate parts of INSN, marking all entries in the
3783 constant pool which are actually being used. Entries that are only
3784 referenced by other constants are also marked as used. Emit
3785 deferred strings that are used. */
3788 mark_constants (rtx insn
)
3793 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3794 insns, not any notes that may be attached. We don't want to mark
3795 a constant just because it happens to appear in a REG_EQUIV note. */
3796 if (GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3798 rtx seq
= PATTERN (insn
);
3799 int i
, n
= XVECLEN (seq
, 0);
3800 for (i
= 0; i
< n
; ++i
)
3802 rtx subinsn
= XVECEXP (seq
, 0, i
);
3803 if (INSN_P (subinsn
))
3804 for_each_rtx (&PATTERN (subinsn
), mark_constant
, NULL
);
3808 for_each_rtx (&PATTERN (insn
), mark_constant
, NULL
);
3811 /* Look through the instructions for this function, and mark all the
3812 entries in POOL which are actually being used. Emit deferred constants
3813 which have indeed been used. */
3816 mark_constant_pool (void)
3820 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
3823 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3824 mark_constants (insn
);
3826 for (link
= crtl
->epilogue_delay_list
;
3828 link
= XEXP (link
, 1))
3829 mark_constants (XEXP (link
, 0));
3832 /* Write all the constants in POOL. */
3835 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
3837 struct constant_descriptor_rtx
*desc
;
3839 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3842 /* If the constant is part of an object_block, make sure that
3843 the constant has been positioned within its block, but do not
3844 write out its definition yet. output_object_blocks will do
3846 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
3847 && SYMBOL_REF_BLOCK (desc
->sym
))
3848 place_block_symbol (desc
->sym
);
3851 switch_to_section (targetm
.asm_out
.select_rtx_section
3852 (desc
->mode
, desc
->constant
, desc
->align
));
3853 output_constant_pool_1 (desc
, desc
->align
);
3858 /* Mark all constants that are used in the current function, then write
3859 out the function's private constant pool. */
3862 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
3863 tree fndecl ATTRIBUTE_UNUSED
)
3865 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
3867 /* It is possible for gcc to call force_const_mem and then to later
3868 discard the instructions which refer to the constant. In such a
3869 case we do not need to output the constant. */
3870 mark_constant_pool ();
3872 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3873 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3876 output_constant_pool_contents (pool
);
3878 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3879 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3883 /* Write the contents of the shared constant pool. */
3886 output_shared_constant_pool (void)
3888 output_constant_pool_contents (shared_constant_pool
);
3891 /* Determine what kind of relocations EXP may need. */
3894 compute_reloc_for_constant (tree exp
)
3896 int reloc
= 0, reloc2
;
3899 switch (TREE_CODE (exp
))
3903 /* Go inside any operations that get_inner_reference can handle and see
3904 if what's inside is a constant: no need to do anything here for
3905 addresses of variables or functions. */
3906 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3907 tem
= TREE_OPERAND (tem
, 0))
3910 if (TREE_PUBLIC (tem
))
3917 case POINTER_PLUS_EXPR
:
3918 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3919 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3923 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3924 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3925 /* The difference of two local labels is computable at link time. */
3926 if (reloc
== 1 && reloc2
== 1)
3933 case VIEW_CONVERT_EXPR
:
3934 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3939 unsigned HOST_WIDE_INT idx
;
3940 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
3942 reloc
|= compute_reloc_for_constant (tem
);
3952 /* Find all the constants whose addresses are referenced inside of EXP,
3953 and make sure assembler code with a label has been output for each one.
3954 Indicate whether an ADDR_EXPR has been encountered. */
3957 output_addressed_constants (tree exp
)
3961 switch (TREE_CODE (exp
))
3965 /* Go inside any operations that get_inner_reference can handle and see
3966 if what's inside is a constant: no need to do anything here for
3967 addresses of variables or functions. */
3968 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3969 tem
= TREE_OPERAND (tem
, 0))
3972 /* If we have an initialized CONST_DECL, retrieve the initializer. */
3973 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
3974 tem
= DECL_INITIAL (tem
);
3976 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
3977 output_constant_def (tem
, 0);
3981 case POINTER_PLUS_EXPR
:
3983 output_addressed_constants (TREE_OPERAND (exp
, 1));
3987 case VIEW_CONVERT_EXPR
:
3988 output_addressed_constants (TREE_OPERAND (exp
, 0));
3993 unsigned HOST_WIDE_INT idx
;
3994 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
3996 output_addressed_constants (tem
);
4005 /* Whether a constructor CTOR is a valid static constant initializer if all
4006 its elements are. This used to be internal to initializer_constant_valid_p
4007 and has been exposed to let other functions like categorize_ctor_elements
4008 evaluate the property while walking a constructor for other purposes. */
4011 constructor_static_from_elts_p (const_tree ctor
)
4013 return (TREE_CONSTANT (ctor
)
4014 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4015 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4016 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4019 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4022 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4023 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4024 which are valid when ENDTYPE is an integer of any size; in
4025 particular, this does not accept a pointer minus a constant. This
4026 returns null_pointer_node if the VALUE is an absolute constant
4027 which can be used to initialize a static variable. Otherwise it
4031 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4035 if (!INTEGRAL_TYPE_P (endtype
))
4038 op0
= TREE_OPERAND (value
, 0);
4039 op1
= TREE_OPERAND (value
, 1);
4041 /* Like STRIP_NOPS except allow the operand mode to widen. This
4042 works around a feature of fold that simplifies (int)(p1 - p2) to
4043 ((int)p1 - (int)p2) under the theory that the narrower operation
4046 while (CONVERT_EXPR_P (op0
)
4047 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4049 tree inner
= TREE_OPERAND (op0
, 0);
4050 if (inner
== error_mark_node
4051 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4052 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4053 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4058 while (CONVERT_EXPR_P (op1
)
4059 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4061 tree inner
= TREE_OPERAND (op1
, 0);
4062 if (inner
== error_mark_node
4063 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4064 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4065 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4070 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4074 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4075 cache
? cache
+ 2 : NULL
);
4076 /* Both initializers must be known. */
4080 && (op0
== null_pointer_node
4081 || TREE_CODE (value
) == MINUS_EXPR
))
4082 return null_pointer_node
;
4084 /* Support differences between labels. */
4085 if (TREE_CODE (op0
) == LABEL_DECL
4086 && TREE_CODE (op1
) == LABEL_DECL
)
4087 return null_pointer_node
;
4089 if (TREE_CODE (op0
) == STRING_CST
4090 && TREE_CODE (op1
) == STRING_CST
4091 && operand_equal_p (op0
, op1
, 1))
4092 return null_pointer_node
;
4098 /* Helper function of initializer_constant_valid_p.
4099 Return nonzero if VALUE is a valid constant-valued expression
4100 for use in initializing a static variable; one that can be an
4101 element of a "constant" initializer.
4103 Return null_pointer_node if the value is absolute;
4104 if it is relocatable, return the variable that determines the relocation.
4105 We assume that VALUE has been folded as much as possible;
4106 therefore, we do not need to check for such things as
4107 arithmetic-combinations of integers.
4109 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4112 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4116 switch (TREE_CODE (value
))
4119 if (constructor_static_from_elts_p (value
))
4121 unsigned HOST_WIDE_INT idx
;
4123 bool absolute
= true;
4125 if (cache
&& cache
[0] == value
)
4127 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4130 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4137 cache
[1] = NULL_TREE
;
4141 if (reloc
!= null_pointer_node
)
4144 /* For a non-absolute relocation, there is no single
4145 variable that can be "the variable that determines the
4150 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4152 return absolute
? null_pointer_node
: error_mark_node
;
4155 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4163 return null_pointer_node
;
4168 tree op0
= staticp (TREE_OPERAND (value
, 0));
4171 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4172 to be a constant, this is old-skool offsetof-like nonsense. */
4173 if (TREE_CODE (op0
) == INDIRECT_REF
4174 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4175 return null_pointer_node
;
4176 /* Taking the address of a nested function involves a trampoline,
4177 unless we don't need or want one. */
4178 if (TREE_CODE (op0
) == FUNCTION_DECL
4179 && DECL_STATIC_CHAIN (op0
)
4180 && !TREE_NO_TRAMPOLINE (value
))
4182 /* "&{...}" requires a temporary to hold the constructed
4184 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4190 case NON_LVALUE_EXPR
:
4191 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4194 case VIEW_CONVERT_EXPR
:
4196 tree src
= TREE_OPERAND (value
, 0);
4197 tree src_type
= TREE_TYPE (src
);
4198 tree dest_type
= TREE_TYPE (value
);
4200 /* Allow view-conversions from aggregate to non-aggregate type only
4201 if the bit pattern is fully preserved afterwards; otherwise, the
4202 RTL expander won't be able to apply a subsequent transformation
4203 to the underlying constructor. */
4204 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4206 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4207 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4212 /* Allow all other kinds of view-conversion. */
4213 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4218 tree src
= TREE_OPERAND (value
, 0);
4219 tree src_type
= TREE_TYPE (src
);
4220 tree dest_type
= TREE_TYPE (value
);
4222 /* Allow conversions between pointer types, floating-point
4223 types, and offset types. */
4224 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4225 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4226 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4227 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4228 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4230 /* Allow length-preserving conversions between integer types. */
4231 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4232 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4233 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4235 /* Allow conversions between other integer types only if
4237 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4239 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4240 if (inner
== null_pointer_node
)
4241 return null_pointer_node
;
4245 /* Allow (int) &foo provided int is as wide as a pointer. */
4246 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4247 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4248 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4250 /* Likewise conversions from int to pointers, but also allow
4251 conversions from 0. */
4252 if ((POINTER_TYPE_P (dest_type
)
4253 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4254 && INTEGRAL_TYPE_P (src_type
))
4256 if (TREE_CODE (src
) == INTEGER_CST
4257 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4258 return null_pointer_node
;
4259 if (integer_zerop (src
))
4260 return null_pointer_node
;
4261 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4262 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4265 /* Allow conversions to struct or union types if the value
4267 if (TREE_CODE (dest_type
) == RECORD_TYPE
4268 || TREE_CODE (dest_type
) == UNION_TYPE
)
4269 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4273 case POINTER_PLUS_EXPR
:
4275 /* Any valid floating-point constants will have been folded by now;
4276 with -frounding-math we hit this with addition of two constants. */
4277 if (TREE_CODE (endtype
) == REAL_TYPE
)
4279 if (cache
&& cache
[0] == value
)
4281 if (! INTEGRAL_TYPE_P (endtype
)
4282 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4284 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4286 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4289 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4290 endtype
, ncache
+ 2);
4291 /* If either term is absolute, use the other term's relocation. */
4292 if (valid0
== null_pointer_node
)
4294 else if (valid1
== null_pointer_node
)
4296 /* Support narrowing pointer differences. */
4298 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4302 /* Support narrowing pointer differences. */
4303 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4312 if (TREE_CODE (endtype
) == REAL_TYPE
)
4314 if (cache
&& cache
[0] == value
)
4316 if (! INTEGRAL_TYPE_P (endtype
)
4317 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4319 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4321 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4324 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4325 endtype
, ncache
+ 2);
4326 /* Win if second argument is absolute. */
4327 if (valid1
== null_pointer_node
)
4329 /* Win if both arguments have the same relocation.
4330 Then the value is absolute. */
4331 else if (valid0
== valid1
&& valid0
!= 0)
4332 ret
= null_pointer_node
;
4333 /* Since GCC guarantees that string constants are unique in the
4334 generated code, a subtraction between two copies of the same
4335 constant string is absolute. */
4336 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4337 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4338 && operand_equal_p (valid0
, valid1
, 1))
4339 ret
= null_pointer_node
;
4340 /* Support narrowing differences. */
4342 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4346 /* Support narrowing differences. */
4347 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4362 /* Return nonzero if VALUE is a valid constant-valued expression
4363 for use in initializing a static variable; one that can be an
4364 element of a "constant" initializer.
4366 Return null_pointer_node if the value is absolute;
4367 if it is relocatable, return the variable that determines the relocation.
4368 We assume that VALUE has been folded as much as possible;
4369 therefore, we do not need to check for such things as
4370 arithmetic-combinations of integers. */
4372 initializer_constant_valid_p (tree value
, tree endtype
)
4374 return initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4377 /* Return true if VALUE is a valid constant-valued expression
4378 for use in initializing a static bit-field; one that can be
4379 an element of a "constant" initializer. */
4382 initializer_constant_valid_for_bitfield_p (tree value
)
4384 /* For bitfields we support integer constants or possibly nested aggregates
4386 switch (TREE_CODE (value
))
4390 unsigned HOST_WIDE_INT idx
;
4393 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4394 if (!initializer_constant_valid_for_bitfield_p (elt
))
4402 case VIEW_CONVERT_EXPR
:
4403 case NON_LVALUE_EXPR
:
4405 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4414 /* output_constructor outer state of relevance in recursive calls, typically
4415 for nested aggregate bitfields. */
4418 unsigned int bit_offset
; /* current position in ... */
4419 int byte
; /* ... the outer byte buffer. */
4422 static unsigned HOST_WIDE_INT
4423 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int,
4426 /* Output assembler code for constant EXP to FILE, with no label.
4427 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4428 Assumes output_addressed_constants has been done on EXP already.
4430 Generate exactly SIZE bytes of assembler data, padding at the end
4431 with zeros if necessary. SIZE must always be specified.
4433 SIZE is important for structure constructors,
4434 since trailing members may have been omitted from the constructor.
4435 It is also important for initialization of arrays from string constants
4436 since the full length of the string constant might not be wanted.
4437 It is also needed for initialization of unions, where the initializer's
4438 type is just one member, and that may not be as long as the union.
4440 There a case in which we would fail to output exactly SIZE bytes:
4441 for a structure constructor that wants to produce more than SIZE bytes.
4442 But such constructors will never be generated for any possible input.
4444 ALIGN is the alignment of the data in bits. */
4447 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4449 enum tree_code code
;
4450 unsigned HOST_WIDE_INT thissize
;
4452 if (size
== 0 || flag_syntax_only
)
4455 /* See if we're trying to initialize a pointer in a non-default mode
4456 to the address of some declaration somewhere. If the target says
4457 the mode is valid for pointers, assume the target has a way of
4459 if (TREE_CODE (exp
) == NOP_EXPR
4460 && POINTER_TYPE_P (TREE_TYPE (exp
))
4461 && targetm
.addr_space
.valid_pointer_mode
4462 (TYPE_MODE (TREE_TYPE (exp
)),
4463 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4465 tree saved_type
= TREE_TYPE (exp
);
4467 /* Peel off any intermediate conversions-to-pointer for valid
4469 while (TREE_CODE (exp
) == NOP_EXPR
4470 && POINTER_TYPE_P (TREE_TYPE (exp
))
4471 && targetm
.addr_space
.valid_pointer_mode
4472 (TYPE_MODE (TREE_TYPE (exp
)),
4473 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4474 exp
= TREE_OPERAND (exp
, 0);
4476 /* If what we're left with is the address of something, we can
4477 convert the address to the final type and output it that
4479 if (TREE_CODE (exp
) == ADDR_EXPR
)
4480 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4481 /* Likewise for constant ints. */
4482 else if (TREE_CODE (exp
) == INTEGER_CST
)
4483 exp
= build_int_cst_wide (saved_type
, TREE_INT_CST_LOW (exp
),
4484 TREE_INT_CST_HIGH (exp
));
4488 /* Eliminate any conversions since we'll be outputting the underlying
4490 while (CONVERT_EXPR_P (exp
)
4491 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4492 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4494 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4495 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4497 /* Make sure eliminating the conversion is really a no-op, except with
4498 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4499 union types to allow for Ada unchecked unions. */
4500 if (type_size
> op_size
4501 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4502 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4503 /* Keep the conversion. */
4506 exp
= TREE_OPERAND (exp
, 0);
4509 code
= TREE_CODE (TREE_TYPE (exp
));
4510 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4512 /* Allow a constructor with no elements for any data type.
4513 This means to fill the space with zeros. */
4514 if (TREE_CODE (exp
) == CONSTRUCTOR
4515 && VEC_empty (constructor_elt
, CONSTRUCTOR_ELTS (exp
)))
4517 assemble_zeros (size
);
4521 if (TREE_CODE (exp
) == FDESC_EXPR
)
4523 #ifdef ASM_OUTPUT_FDESC
4524 HOST_WIDE_INT part
= tree_low_cst (TREE_OPERAND (exp
, 1), 0);
4525 tree decl
= TREE_OPERAND (exp
, 0);
4526 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4533 /* Now output the underlying data. If we've handling the padding, return.
4534 Otherwise, break and ensure SIZE is the size written. */
4541 case REFERENCE_TYPE
:
4543 case FIXED_POINT_TYPE
:
4544 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4545 EXPAND_INITIALIZER
),
4546 MIN (size
, thissize
), align
, 0))
4547 error ("initializer for integer/fixed-point value is too complicated");
4551 if (TREE_CODE (exp
) != REAL_CST
)
4552 error ("initializer for floating value is not a floating constant");
4554 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4558 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4559 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4560 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4565 switch (TREE_CODE (exp
))
4568 output_constructor (exp
, size
, align
, NULL
);
4571 thissize
= MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
),
4573 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4580 unsigned int nalign
;
4581 enum machine_mode inner
;
4583 inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4584 nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4586 elt_size
= GET_MODE_SIZE (inner
);
4588 link
= TREE_VECTOR_CST_ELTS (exp
);
4589 output_constant (TREE_VALUE (link
), elt_size
, align
);
4590 thissize
= elt_size
;
4591 while ((link
= TREE_CHAIN (link
)) != NULL
)
4593 output_constant (TREE_VALUE (link
), elt_size
, nalign
);
4594 thissize
+= elt_size
;
4605 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4606 output_constructor (exp
, size
, align
, NULL
);
4616 if (size
> thissize
)
4617 assemble_zeros (size
- thissize
);
4621 /* Subroutine of output_constructor, used for computing the size of
4622 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4623 type with an unspecified upper bound. */
4625 static unsigned HOST_WIDE_INT
4626 array_size_for_constructor (tree val
)
4629 unsigned HOST_WIDE_INT cnt
;
4630 tree index
, value
, tmp
;
4632 /* This code used to attempt to handle string constants that are not
4633 arrays of single-bytes, but nothing else does, so there's no point in
4635 if (TREE_CODE (val
) == STRING_CST
)
4636 return TREE_STRING_LENGTH (val
);
4638 max_index
= NULL_TREE
;
4639 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4641 if (TREE_CODE (index
) == RANGE_EXPR
)
4642 index
= TREE_OPERAND (index
, 1);
4643 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4647 if (max_index
== NULL_TREE
)
4650 /* Compute the total number of array elements. */
4651 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4652 i
= size_binop (MINUS_EXPR
, fold_convert (sizetype
, max_index
),
4653 fold_convert (sizetype
, tmp
));
4654 i
= size_binop (PLUS_EXPR
, i
, size_one_node
);
4656 /* Multiply by the array element unit size to find number of bytes. */
4657 i
= size_binop (MULT_EXPR
, i
, TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4659 return tree_low_cst (i
, 1);
4662 /* Other datastructures + helpers for output_constructor. */
4664 /* output_constructor local state to support interaction with helpers. */
4668 /* Received arguments. */
4669 tree exp
; /* Constructor expression. */
4670 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4671 unsigned int align
; /* Known initial alignment. */
4673 /* Constructor expression data. */
4674 tree type
; /* Expression type. */
4675 tree field
; /* Current field decl in a record. */
4676 tree min_index
; /* Lower bound if specified for an array. */
4678 /* Output processing state. */
4679 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4680 bool byte_buffer_in_use
; /* Whether byte ... */
4681 int byte
; /* ... contains part of a bitfield byte yet to
4684 int last_relative_index
; /* Implicit or explicit index of the last
4685 array element output within a bitfield. */
4686 /* Current element. */
4687 tree val
; /* Current element value. */
4688 tree index
; /* Current element index. */
4692 /* Helper for output_constructor. From the current LOCAL state, output a
4693 RANGE_EXPR element. */
4696 output_constructor_array_range (oc_local_state
*local
)
4698 unsigned HOST_WIDE_INT fieldsize
4699 = int_size_in_bytes (TREE_TYPE (local
->type
));
4701 HOST_WIDE_INT lo_index
4702 = tree_low_cst (TREE_OPERAND (local
->index
, 0), 0);
4703 HOST_WIDE_INT hi_index
4704 = tree_low_cst (TREE_OPERAND (local
->index
, 1), 0);
4705 HOST_WIDE_INT index
;
4708 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4710 for (index
= lo_index
; index
<= hi_index
; index
++)
4712 /* Output the element's initial value. */
4713 if (local
->val
== NULL_TREE
)
4714 assemble_zeros (fieldsize
);
4716 output_constant (local
->val
, fieldsize
, align2
);
4718 /* Count its size. */
4719 local
->total_bytes
+= fieldsize
;
4723 /* Helper for output_constructor. From the current LOCAL state, output a
4724 field element that is not true bitfield or part of an outer one. */
4727 output_constructor_regular_field (oc_local_state
*local
)
4729 /* Field size and position. Since this structure is static, we know the
4730 positions are constant. */
4731 unsigned HOST_WIDE_INT fieldsize
;
4732 HOST_WIDE_INT fieldpos
;
4734 unsigned int align2
;
4736 if (local
->index
!= NULL_TREE
)
4737 fieldpos
= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
)), 1)
4738 * ((tree_low_cst (local
->index
, 0)
4739 - tree_low_cst (local
->min_index
, 0))));
4740 else if (local
->field
!= NULL_TREE
)
4741 fieldpos
= int_byte_position (local
->field
);
4745 /* Output any buffered-up bit-fields preceding this element. */
4746 if (local
->byte_buffer_in_use
)
4748 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4749 local
->total_bytes
++;
4750 local
->byte_buffer_in_use
= false;
4753 /* Advance to offset of this element.
4754 Note no alignment needed in an array, since that is guaranteed
4755 if each element has the proper size. */
4756 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4757 && fieldpos
!= local
->total_bytes
)
4759 gcc_assert (fieldpos
>= local
->total_bytes
);
4760 assemble_zeros (fieldpos
- local
->total_bytes
);
4761 local
->total_bytes
= fieldpos
;
4764 /* Find the alignment of this element. */
4765 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
4767 /* Determine size this element should occupy. */
4772 /* If this is an array with an unspecified upper bound,
4773 the initializer determines the size. */
4774 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4775 but we cannot do this until the deprecated support for
4776 initializing zero-length array members is removed. */
4777 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
4778 && TYPE_DOMAIN (TREE_TYPE (local
->field
))
4779 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
))))
4781 fieldsize
= array_size_for_constructor (local
->val
);
4782 /* Given a non-empty initialization, this field had
4784 gcc_assert (!fieldsize
|| !DECL_CHAIN (local
->field
));
4786 else if (DECL_SIZE_UNIT (local
->field
))
4788 /* ??? This can't be right. If the decl size overflows
4789 a host integer we will silently emit no data. */
4790 if (host_integerp (DECL_SIZE_UNIT (local
->field
), 1))
4791 fieldsize
= tree_low_cst (DECL_SIZE_UNIT (local
->field
), 1);
4795 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
4797 /* Output the element's initial value. */
4798 if (local
->val
== NULL_TREE
)
4799 assemble_zeros (fieldsize
);
4801 output_constant (local
->val
, fieldsize
, align2
);
4803 /* Count its size. */
4804 local
->total_bytes
+= fieldsize
;
4807 /* Helper for output_constructor. From the current LOCAL and OUTER states,
4808 output an element that is a true bitfield or part of an outer one. */
4811 output_constructor_bitfield (oc_local_state
*local
, oc_outer_state
*outer
)
4813 /* Bit size of this element. */
4814 HOST_WIDE_INT ebitsize
4816 ? tree_low_cst (DECL_SIZE (local
->field
), 1)
4817 : tree_low_cst (TYPE_SIZE (TREE_TYPE (local
->type
)), 1));
4819 /* Relative index of this element if this is an array component. */
4820 HOST_WIDE_INT relative_index
4823 ? (tree_low_cst (local
->index
, 0)
4824 - tree_low_cst (local
->min_index
, 0))
4825 : local
->last_relative_index
+ 1)
4828 /* Bit position of this element from the start of the containing
4830 HOST_WIDE_INT constructor_relative_ebitpos
4832 ? int_bit_position (local
->field
)
4833 : ebitsize
* relative_index
);
4835 /* Bit position of this element from the start of a possibly ongoing
4836 outer byte buffer. */
4837 HOST_WIDE_INT byte_relative_ebitpos
4838 = ((outer
? outer
->bit_offset
: 0) + constructor_relative_ebitpos
);
4840 /* From the start of a possibly ongoing outer byte buffer, offsets to
4841 the first bit of this element and to the first bit past the end of
4843 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
4844 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
4846 local
->last_relative_index
= relative_index
;
4848 if (local
->val
== NULL_TREE
)
4849 local
->val
= integer_zero_node
;
4851 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
4852 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
4853 local
->val
= TREE_OPERAND (local
->val
, 0);
4855 if (TREE_CODE (local
->val
) != INTEGER_CST
4856 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
4858 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
4862 /* If this field does not start in this (or, next) byte,
4864 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4866 /* Output remnant of any bit field in previous bytes. */
4867 if (local
->byte_buffer_in_use
)
4869 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4870 local
->total_bytes
++;
4871 local
->byte_buffer_in_use
= false;
4874 /* If still not at proper byte, advance to there. */
4875 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4877 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
4878 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
4879 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
4883 /* Set up the buffer if necessary. */
4884 if (!local
->byte_buffer_in_use
)
4888 local
->byte_buffer_in_use
= true;
4891 /* If this is nested constructor, recurse passing the bit offset and the
4892 pending data, then retrieve the new pending data afterwards. */
4893 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
4895 oc_outer_state output_state
;
4897 output_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
4898 output_state
.byte
= local
->byte
;
4900 += output_constructor (local
->val
, 0, 0, &output_state
);
4901 local
->byte
= output_state
.byte
;
4905 /* Otherwise, we must split the element into pieces that fall within
4906 separate bytes, and combine each byte with previous or following
4908 while (next_offset
< end_offset
)
4912 HOST_WIDE_INT value
;
4913 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
4914 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
4916 /* Advance from byte to byte
4917 within this element when necessary. */
4918 while (next_byte
!= local
->total_bytes
)
4920 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4921 local
->total_bytes
++;
4925 /* Number of bits we can process at once
4926 (all part of the same byte). */
4927 this_time
= MIN (end_offset
- next_offset
,
4928 BITS_PER_UNIT
- next_bit
);
4929 if (BYTES_BIG_ENDIAN
)
4931 /* On big-endian machine, take the most significant bits
4932 first (of the bits that are significant)
4933 and put them into bytes from the most significant end. */
4934 shift
= end_offset
- next_offset
- this_time
;
4936 /* Don't try to take a bunch of bits that cross
4937 the word boundary in the INTEGER_CST. We can
4938 only select bits from the LOW or HIGH part
4940 if (shift
< HOST_BITS_PER_WIDE_INT
4941 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4943 this_time
= shift
+ this_time
- HOST_BITS_PER_WIDE_INT
;
4944 shift
= HOST_BITS_PER_WIDE_INT
;
4947 /* Now get the bits from the appropriate constant word. */
4948 if (shift
< HOST_BITS_PER_WIDE_INT
)
4949 value
= TREE_INT_CST_LOW (local
->val
);
4952 gcc_assert (shift
< 2 * HOST_BITS_PER_WIDE_INT
);
4953 value
= TREE_INT_CST_HIGH (local
->val
);
4954 shift
-= HOST_BITS_PER_WIDE_INT
;
4957 /* Get the result. This works only when:
4958 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4959 local
->byte
|= (((value
>> shift
)
4960 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
4961 << (BITS_PER_UNIT
- this_time
- next_bit
));
4965 /* On little-endian machines,
4966 take first the least significant bits of the value
4967 and pack them starting at the least significant
4968 bits of the bytes. */
4969 shift
= next_offset
- byte_relative_ebitpos
;
4971 /* Don't try to take a bunch of bits that cross
4972 the word boundary in the INTEGER_CST. We can
4973 only select bits from the LOW or HIGH part
4975 if (shift
< HOST_BITS_PER_WIDE_INT
4976 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4977 this_time
= (HOST_BITS_PER_WIDE_INT
- shift
);
4979 /* Now get the bits from the appropriate constant word. */
4980 if (shift
< HOST_BITS_PER_WIDE_INT
)
4981 value
= TREE_INT_CST_LOW (local
->val
);
4984 gcc_assert (shift
< 2 * HOST_BITS_PER_WIDE_INT
);
4985 value
= TREE_INT_CST_HIGH (local
->val
);
4986 shift
-= HOST_BITS_PER_WIDE_INT
;
4989 /* Get the result. This works only when:
4990 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4991 local
->byte
|= (((value
>> shift
)
4992 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
4996 next_offset
+= this_time
;
4997 local
->byte_buffer_in_use
= true;
5001 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5002 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5003 caller output state of relevance in recursive invocations. */
5005 static unsigned HOST_WIDE_INT
5006 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
5007 unsigned int align
, oc_outer_state
* outer
)
5009 unsigned HOST_WIDE_INT cnt
;
5010 constructor_elt
*ce
;
5012 oc_local_state local
;
5014 /* Setup our local state to communicate with helpers. */
5017 local
.align
= align
;
5019 local
.total_bytes
= 0;
5020 local
.byte_buffer_in_use
= outer
!= NULL
;
5021 local
.byte
= outer
? outer
->byte
: 0;
5023 local
.type
= TREE_TYPE (exp
);
5025 local
.last_relative_index
= -1;
5027 local
.min_index
= NULL_TREE
;
5028 if (TREE_CODE (local
.type
) == ARRAY_TYPE
5029 && TYPE_DOMAIN (local
.type
) != NULL_TREE
)
5030 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5032 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5034 /* As CE goes through the elements of the constant, FIELD goes through the
5035 structure fields if the constant is a structure. If the constant is a
5036 union, we override this by getting the field from the TREE_LIST element.
5037 But the constant could also be an array. Then FIELD is zero.
5039 There is always a maximum of one element in the chain LINK for unions
5040 (even if the initializer in a source program incorrectly contains
5043 local
.field
= NULL_TREE
;
5044 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5045 local
.field
= TYPE_FIELDS (local
.type
);
5048 VEC_iterate (constructor_elt
, CONSTRUCTOR_ELTS (exp
), cnt
, ce
);
5049 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5051 local
.val
= ce
->value
;
5052 local
.index
= NULL_TREE
;
5054 /* The element in a union constructor specifies the proper field
5056 if ((TREE_CODE (local
.type
) == RECORD_TYPE
5057 || TREE_CODE (local
.type
) == UNION_TYPE
5058 || TREE_CODE (local
.type
) == QUAL_UNION_TYPE
)
5059 && ce
->index
!= NULL_TREE
)
5060 local
.field
= ce
->index
;
5062 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5063 local
.index
= ce
->index
;
5065 #ifdef ASM_COMMENT_START
5066 if (local
.field
&& flag_verbose_asm
)
5067 fprintf (asm_out_file
, "%s %s:\n",
5069 DECL_NAME (local
.field
)
5070 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5074 /* Eliminate the marker that makes a cast not be an lvalue. */
5075 if (local
.val
!= NULL_TREE
)
5076 STRIP_NOPS (local
.val
);
5078 /* Output the current element, using the appropriate helper ... */
5080 /* For an array slice not part of an outer bitfield. */
5082 && local
.index
!= NULL_TREE
5083 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5084 output_constructor_array_range (&local
);
5086 /* For a field that is neither a true bitfield nor part of an outer one,
5087 known to be at least byte aligned and multiple-of-bytes long. */
5089 && (local
.field
== NULL_TREE
5090 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5091 output_constructor_regular_field (&local
);
5093 /* For a true bitfield or part of an outer one. */
5095 output_constructor_bitfield (&local
, outer
);
5098 /* If we are not at toplevel, save the pending data for our caller.
5099 Otherwise output the pending data and padding zeros as needed. */
5101 outer
->byte
= local
.byte
;
5104 if (local
.byte_buffer_in_use
)
5106 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5107 local
.total_bytes
++;
5110 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5112 assemble_zeros (local
.size
- local
.total_bytes
);
5113 local
.total_bytes
= local
.size
;
5117 return local
.total_bytes
;
5120 /* Mark DECL as weak. */
5123 mark_weak (tree decl
)
5125 DECL_WEAK (decl
) = 1;
5127 if (DECL_RTL_SET_P (decl
)
5128 && MEM_P (DECL_RTL (decl
))
5129 && XEXP (DECL_RTL (decl
), 0)
5130 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5131 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5134 /* Merge weak status between NEWDECL and OLDDECL. */
5137 merge_weak (tree newdecl
, tree olddecl
)
5139 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5141 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5144 /* We put the NEWDECL on the weak_decls list at some point
5145 and OLDDECL as well. Keep just OLDDECL on the list. */
5146 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5147 if (TREE_VALUE (*pwd
) == newdecl
)
5149 *pwd
= TREE_CHAIN (*pwd
);
5156 if (DECL_WEAK (newdecl
))
5160 /* NEWDECL is weak, but OLDDECL is not. */
5162 /* If we already output the OLDDECL, we're in trouble; we can't
5163 go back and make it weak. This should never happen in
5164 unit-at-a-time compilation. */
5165 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5167 /* If we've already generated rtl referencing OLDDECL, we may
5168 have done so in a way that will not function properly with
5169 a weak symbol. Again in unit-at-a-time this should be
5171 gcc_assert (!TREE_USED (olddecl
)
5172 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5174 if (TARGET_SUPPORTS_WEAK
)
5176 /* We put the NEWDECL on the weak_decls list at some point.
5177 Replace it with the OLDDECL. */
5178 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5179 if (TREE_VALUE (wd
) == newdecl
)
5181 TREE_VALUE (wd
) = olddecl
;
5184 /* We may not find the entry on the list. If NEWDECL is a
5185 weak alias, then we will have already called
5186 globalize_decl to remove the entry; in that case, we do
5187 not need to do anything. */
5190 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5191 mark_weak (olddecl
);
5194 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5195 weak. Just update NEWDECL to indicate that it's weak too. */
5196 mark_weak (newdecl
);
5199 /* Declare DECL to be a weak symbol. */
5202 declare_weak (tree decl
)
5204 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5205 if (! TREE_PUBLIC (decl
))
5206 error ("weak declaration of %q+D must be public", decl
);
5207 else if (!TARGET_SUPPORTS_WEAK
)
5208 warning (0, "weak declaration of %q+D not supported", decl
);
5211 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5212 DECL_ATTRIBUTES (decl
)
5213 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5217 weak_finish_1 (tree decl
)
5219 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5220 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5223 if (! TREE_USED (decl
))
5226 #ifdef ASM_WEAKEN_DECL
5227 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5229 #ifdef ASM_WEAKEN_LABEL
5230 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5232 #ifdef ASM_OUTPUT_WEAK_ALIAS
5234 static bool warn_once
= 0;
5237 warning (0, "only weak aliases are supported in this configuration");
5247 /* This TREE_LIST contains weakref targets. */
5249 static GTY(()) tree weakref_targets
;
5251 /* Forward declaration. */
5252 static tree
find_decl_and_mark_needed (tree decl
, tree target
);
5254 /* Emit any pending weak declarations. */
5261 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5263 tree alias_decl
= TREE_PURPOSE (t
);
5264 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5266 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5267 /* Remove alias_decl from the weak list, but leave entries for
5268 the target alone. */
5270 #ifndef ASM_OUTPUT_WEAKREF
5271 else if (! TREE_SYMBOL_REFERENCED (target
))
5273 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5274 defined, otherwise we and weak_finish_1 would use
5275 different macros. */
5276 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5277 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5279 tree decl
= find_decl_and_mark_needed (alias_decl
, target
);
5283 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5284 TREE_CODE (alias_decl
), target
,
5285 TREE_TYPE (alias_decl
));
5287 DECL_EXTERNAL (decl
) = 1;
5288 TREE_PUBLIC (decl
) = 1;
5289 DECL_ARTIFICIAL (decl
) = 1;
5290 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5291 TREE_USED (decl
) = 1;
5294 weak_finish_1 (decl
);
5303 /* Remove the alias and the target from the pending weak list
5304 so that we do not emit any .weak directives for the former,
5305 nor multiple .weak directives for the latter. */
5306 for (p
= &weak_decls
; (t2
= *p
) ; )
5308 if (TREE_VALUE (t2
) == alias_decl
5309 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5310 *p
= TREE_CHAIN (t2
);
5312 p
= &TREE_CHAIN (t2
);
5315 /* Remove other weakrefs to the same target, to speed things up. */
5316 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5318 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5319 *p
= TREE_CHAIN (t2
);
5321 p
= &TREE_CHAIN (t2
);
5326 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5328 tree decl
= TREE_VALUE (t
);
5330 weak_finish_1 (decl
);
5334 /* Emit the assembly bits to indicate that DECL is globally visible. */
5337 globalize_decl (tree decl
)
5340 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5341 if (DECL_WEAK (decl
))
5343 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5346 #ifdef ASM_WEAKEN_DECL
5347 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5349 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5352 /* Remove this function from the pending weak list so that
5353 we do not emit multiple .weak directives for it. */
5354 for (p
= &weak_decls
; (t
= *p
) ; )
5356 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5357 *p
= TREE_CHAIN (t
);
5359 p
= &TREE_CHAIN (t
);
5362 /* Remove weakrefs to the same target from the pending weakref
5363 list, for the same reason. */
5364 for (p
= &weakref_targets
; (t
= *p
) ; )
5366 if (DECL_ASSEMBLER_NAME (decl
)
5367 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5368 *p
= TREE_CHAIN (t
);
5370 p
= &TREE_CHAIN (t
);
5377 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5380 VEC(alias_pair
,gc
) *alias_pairs
;
5382 /* Given an assembly name, find the decl it is associated with. At the
5383 same time, mark it needed for cgraph. */
5386 find_decl_and_mark_needed (tree decl
, tree target
)
5388 struct cgraph_node
*fnode
= NULL
;
5389 struct varpool_node
*vnode
= NULL
;
5391 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5393 fnode
= cgraph_node_for_asm (target
);
5395 vnode
= varpool_node_for_asm (target
);
5399 vnode
= varpool_node_for_asm (target
);
5401 fnode
= cgraph_node_for_asm (target
);
5406 cgraph_mark_needed_node (fnode
);
5411 varpool_mark_needed_node (vnode
);
5412 vnode
->force_output
= 1;
5419 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5420 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5421 tree node is DECL to have the value of the tree node TARGET. */
5424 do_assemble_alias (tree decl
, tree target
)
5426 /* Emulated TLS had better not get this var. */
5427 gcc_assert(!(!targetm
.have_tls
5428 && TREE_CODE (decl
) == VAR_DECL
5429 && DECL_THREAD_LOCAL_P (decl
)));
5431 if (TREE_ASM_WRITTEN (decl
))
5434 /* We must force creation of DECL_RTL for debug info generation, even though
5435 we don't use it here. */
5436 make_decl_rtl (decl
);
5438 TREE_ASM_WRITTEN (decl
) = 1;
5439 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5441 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5443 ultimate_transparent_alias_target (&target
);
5445 if (!TREE_SYMBOL_REFERENCED (target
))
5446 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5448 #ifdef ASM_OUTPUT_WEAKREF
5449 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5450 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5451 IDENTIFIER_POINTER (target
));
5453 if (!TARGET_SUPPORTS_WEAK
)
5455 error_at (DECL_SOURCE_LOCATION (decl
),
5456 "weakref is not supported in this configuration");
5463 #ifdef ASM_OUTPUT_DEF
5464 /* Make name accessible from other files, if appropriate. */
5466 if (TREE_PUBLIC (decl
))
5468 globalize_decl (decl
);
5469 maybe_assemble_visibility (decl
);
5471 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5473 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE) && HAVE_GNU_INDIRECT_FUNCTION
5474 ASM_OUTPUT_TYPE_DIRECTIVE
5475 (asm_out_file
, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5478 error_at (DECL_SOURCE_LOCATION (decl
),
5479 "ifunc is not supported in this configuration");
5483 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5484 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5486 ASM_OUTPUT_DEF (asm_out_file
,
5487 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5488 IDENTIFIER_POINTER (target
));
5490 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5495 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5496 # ifdef ASM_WEAKEN_DECL
5497 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5499 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5501 /* Remove this function from the pending weak list so that
5502 we do not emit multiple .weak directives for it. */
5503 for (p
= &weak_decls
; (t
= *p
) ; )
5504 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5505 *p
= TREE_CHAIN (t
);
5507 p
= &TREE_CHAIN (t
);
5509 /* Remove weakrefs to the same target from the pending weakref
5510 list, for the same reason. */
5511 for (p
= &weakref_targets
; (t
= *p
) ; )
5513 if (DECL_ASSEMBLER_NAME (decl
)
5514 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5515 *p
= TREE_CHAIN (t
);
5517 p
= &TREE_CHAIN (t
);
5524 /* Allocate and construct a symbol alias set. */
5526 static symbol_alias_set_t
*
5527 symbol_alias_set_create (void)
5529 return pointer_set_create ();
5532 /* Destruct and free a symbol alias set. */
5535 symbol_alias_set_destroy (symbol_alias_set_t
*aset
)
5537 pointer_set_destroy (aset
);
5540 /* Test if a symbol alias set contains a given name. */
5543 symbol_alias_set_contains (const symbol_alias_set_t
*aset
, tree t
)
5545 /* We accept either a DECL or an IDENTIFIER directly. */
5546 if (TREE_CODE (t
) != IDENTIFIER_NODE
)
5547 t
= DECL_ASSEMBLER_NAME (t
);
5548 t
= targetm
.asm_out
.mangle_assembler_name (IDENTIFIER_POINTER (t
));
5549 return pointer_set_contains (aset
, t
);
5552 /* Enter a new name into a symbol alias set. */
5555 symbol_alias_set_insert (symbol_alias_set_t
*aset
, tree t
)
5557 /* We accept either a DECL or an IDENTIFIER directly. */
5558 if (TREE_CODE (t
) != IDENTIFIER_NODE
)
5559 t
= DECL_ASSEMBLER_NAME (t
);
5560 t
= targetm
.asm_out
.mangle_assembler_name (IDENTIFIER_POINTER (t
));
5561 return pointer_set_insert (aset
, t
);
5564 /* IN_SET_P is a predicate function assuming to be taken
5565 alias_pair->decl, alias_pair->target and DATA arguments.
5567 Compute set of aliases by including everything where TRIVIALLY_VISIBLE
5568 predeicate is true and propagate across aliases such that when
5569 alias DECL is included, its TARGET is included too. */
5571 static symbol_alias_set_t
*
5572 propagate_aliases_forward (bool (*in_set_p
)
5573 (tree decl
, tree target
, void *data
),
5576 symbol_alias_set_t
*set
;
5581 set
= symbol_alias_set_create ();
5582 for (i
= 0; VEC_iterate (alias_pair
, alias_pairs
, i
, p
); ++i
)
5583 if (in_set_p (p
->decl
, p
->target
, data
))
5584 symbol_alias_set_insert (set
, p
->decl
);
5588 for (i
= 0; VEC_iterate (alias_pair
, alias_pairs
, i
, p
); ++i
)
5589 if (symbol_alias_set_contains (set
, p
->decl
)
5590 && !symbol_alias_set_insert (set
, p
->target
))
5598 /* Like propagate_aliases_forward but do backward propagation. */
5600 symbol_alias_set_t
*
5601 propagate_aliases_backward (bool (*in_set_p
)
5602 (tree decl
, tree target
, void *data
),
5605 symbol_alias_set_t
*set
;
5610 /* We have to compute the set of set nodes including aliases
5612 set
= symbol_alias_set_create ();
5613 for (i
= 0; VEC_iterate (alias_pair
, alias_pairs
, i
, p
); ++i
)
5614 if (in_set_p (p
->decl
, p
->target
, data
))
5615 symbol_alias_set_insert (set
, p
->target
);
5619 for (i
= 0; VEC_iterate (alias_pair
, alias_pairs
, i
, p
); ++i
)
5620 if (symbol_alias_set_contains (set
, p
->target
)
5621 && !symbol_alias_set_insert (set
, p
->decl
))
5628 /* See if the alias is trivially visible. This means
5629 1) alias is expoerted from the unit or
5630 2) alias is used in the code.
5631 We assume that unused cgraph/varpool nodes has been
5633 Used as callback for propagate_aliases. */
5636 trivially_visible_alias (tree decl
, tree target ATTRIBUTE_UNUSED
,
5637 void *data ATTRIBUTE_UNUSED
)
5639 struct cgraph_node
*fnode
= NULL
;
5640 struct varpool_node
*vnode
= NULL
;
5642 if (!TREE_PUBLIC (decl
))
5644 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5645 fnode
= cgraph_get_node (decl
);
5647 vnode
= varpool_get_node (decl
);
5648 return vnode
|| fnode
;
5654 /* See if the target of alias is defined in this unit.
5655 Used as callback for propagate_aliases. */
5658 trivially_defined_alias (tree decl ATTRIBUTE_UNUSED
,
5660 void *data ATTRIBUTE_UNUSED
)
5662 struct cgraph_node
*fnode
= NULL
;
5663 struct varpool_node
*vnode
= NULL
;
5665 fnode
= cgraph_node_for_asm (target
);
5666 vnode
= (fnode
== NULL
) ? varpool_node_for_asm (target
) : NULL
;
5667 return (fnode
&& fnode
->analyzed
) || (vnode
&& vnode
->finalized
);
5670 /* Remove the alias pairing for functions that are no longer in the call
5674 remove_unreachable_alias_pairs (void)
5676 symbol_alias_set_t
*visible
;
5680 if (alias_pairs
== NULL
)
5683 /* We have to compute the set of visible nodes including aliases
5685 visible
= propagate_aliases_forward (trivially_visible_alias
, NULL
);
5687 for (i
= 0; VEC_iterate (alias_pair
, alias_pairs
, i
, p
); )
5689 if (!DECL_EXTERNAL (p
->decl
)
5690 && !symbol_alias_set_contains (visible
, p
->decl
))
5692 VEC_unordered_remove (alias_pair
, alias_pairs
, i
);
5699 symbol_alias_set_destroy (visible
);
5703 /* First pass of completing pending aliases. Make sure that cgraph knows
5704 which symbols will be required. */
5707 finish_aliases_1 (void)
5709 symbol_alias_set_t
*defined
;
5713 if (alias_pairs
== NULL
)
5716 /* We have to compute the set of defined nodes including aliases
5718 defined
= propagate_aliases_backward (trivially_defined_alias
, NULL
);
5720 FOR_EACH_VEC_ELT (alias_pair
, alias_pairs
, i
, p
)
5724 target_decl
= find_decl_and_mark_needed (p
->decl
, p
->target
);
5725 if (target_decl
== NULL
)
5727 if (symbol_alias_set_contains (defined
, p
->target
))
5730 if (! (p
->emitted_diags
& ALIAS_DIAG_TO_UNDEF
)
5731 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p
->decl
)))
5733 error ("%q+D aliased to undefined symbol %qE",
5734 p
->decl
, p
->target
);
5735 p
->emitted_diags
|= ALIAS_DIAG_TO_UNDEF
;
5738 else if (! (p
->emitted_diags
& ALIAS_DIAG_TO_EXTERN
)
5739 && DECL_EXTERNAL (target_decl
)
5740 /* We use local aliases for C++ thunks to force the tailcall
5741 to bind locally. This is a hack - to keep it working do
5742 the following (which is not strictly correct). */
5743 && (! TREE_CODE (target_decl
) == FUNCTION_DECL
5744 || ! DECL_VIRTUAL_P (target_decl
))
5745 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p
->decl
)))
5747 error ("%q+D aliased to external symbol %qE",
5748 p
->decl
, p
->target
);
5749 p
->emitted_diags
|= ALIAS_DIAG_TO_EXTERN
;
5753 symbol_alias_set_destroy (defined
);
5756 /* Second pass of completing pending aliases. Emit the actual assembly.
5757 This happens at the end of compilation and thus it is assured that the
5758 target symbol has been emitted. */
5761 finish_aliases_2 (void)
5766 FOR_EACH_VEC_ELT (alias_pair
, alias_pairs
, i
, p
)
5767 do_assemble_alias (p
->decl
, p
->target
);
5769 VEC_truncate (alias_pair
, alias_pairs
, 0);
5772 /* Emit an assembler directive to make the symbol for DECL an alias to
5773 the symbol for TARGET. */
5776 assemble_alias (tree decl
, tree target
)
5779 bool is_weakref
= false;
5781 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5783 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5787 ultimate_transparent_alias_target (&target
);
5789 if (alias
== target
)
5790 error ("weakref %q+D ultimately targets itself", decl
);
5793 #ifndef ASM_OUTPUT_WEAKREF
5794 IDENTIFIER_TRANSPARENT_ALIAS (alias
) = 1;
5795 TREE_CHAIN (alias
) = target
;
5798 if (TREE_PUBLIC (decl
))
5799 error ("weakref %q+D must have static linkage", decl
);
5803 #if !defined (ASM_OUTPUT_DEF)
5804 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5805 error_at (DECL_SOURCE_LOCATION (decl
),
5806 "alias definitions not supported in this configuration");
5809 if (!DECL_WEAK (decl
))
5811 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5812 error_at (DECL_SOURCE_LOCATION (decl
),
5813 "ifunc is not supported in this configuration");
5815 error_at (DECL_SOURCE_LOCATION (decl
),
5816 "only weak aliases are supported in this configuration");
5822 TREE_USED (decl
) = 1;
5824 /* A quirk of the initial implementation of aliases required that the user
5825 add "extern" to all of them. Which is silly, but now historical. Do
5826 note that the symbol is in fact locally defined. */
5828 DECL_EXTERNAL (decl
) = 0;
5830 /* Allow aliases to aliases. */
5831 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5832 cgraph_node (decl
)->alias
= true;
5834 varpool_node (decl
)->alias
= true;
5836 /* If the target has already been emitted, we don't have to queue the
5837 alias. This saves a tad of memory. */
5838 if (cgraph_global_info_ready
)
5839 target_decl
= find_decl_and_mark_needed (decl
, target
);
5842 if (target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5843 do_assemble_alias (decl
, target
);
5846 alias_pair
*p
= VEC_safe_push (alias_pair
, gc
, alias_pairs
, NULL
);
5849 p
->emitted_diags
= ALIAS_DIAG_NONE
;
5853 /* Emit an assembler directive to set symbol for DECL visibility to
5854 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5857 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5858 int vis ATTRIBUTE_UNUSED
)
5860 #ifdef HAVE_GAS_HIDDEN
5861 static const char * const visibility_types
[] = {
5862 NULL
, "protected", "hidden", "internal"
5865 const char *name
, *type
;
5867 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5868 type
= visibility_types
[vis
];
5870 fprintf (asm_out_file
, "\t.%s\t", type
);
5871 assemble_name (asm_out_file
, name
);
5872 fprintf (asm_out_file
, "\n");
5874 warning (OPT_Wattributes
, "visibility attribute not supported "
5875 "in this configuration; ignored");
5879 /* A helper function to call assemble_visibility when needed for a decl. */
5882 maybe_assemble_visibility (tree decl
)
5884 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5886 if (vis
!= VISIBILITY_DEFAULT
)
5888 targetm
.asm_out
.assemble_visibility (decl
, vis
);
5895 /* Returns 1 if the target configuration supports defining public symbols
5896 so that one of them will be chosen at link time instead of generating a
5897 multiply-defined symbol error, whether through the use of weak symbols or
5898 a target-specific mechanism for having duplicates discarded. */
5901 supports_one_only (void)
5903 if (SUPPORTS_ONE_ONLY
)
5905 return TARGET_SUPPORTS_WEAK
;
5908 /* Set up DECL as a public symbol that can be defined in multiple
5909 translation units without generating a linker error. */
5912 make_decl_one_only (tree decl
, tree comdat_group
)
5914 gcc_assert (TREE_CODE (decl
) == VAR_DECL
5915 || TREE_CODE (decl
) == FUNCTION_DECL
);
5917 TREE_PUBLIC (decl
) = 1;
5919 if (SUPPORTS_ONE_ONLY
)
5921 #ifdef MAKE_DECL_ONE_ONLY
5922 MAKE_DECL_ONE_ONLY (decl
);
5924 DECL_COMDAT_GROUP (decl
) = comdat_group
;
5926 else if (TREE_CODE (decl
) == VAR_DECL
5927 && (DECL_INITIAL (decl
) == 0 || DECL_INITIAL (decl
) == error_mark_node
))
5928 DECL_COMMON (decl
) = 1;
5931 gcc_assert (TARGET_SUPPORTS_WEAK
);
5932 DECL_WEAK (decl
) = 1;
5937 init_varasm_once (void)
5939 section_htab
= htab_create_ggc (31, section_entry_hash
,
5940 section_entry_eq
, NULL
);
5941 object_block_htab
= htab_create_ggc (31, object_block_entry_hash
,
5942 object_block_entry_eq
, NULL
);
5943 const_desc_htab
= htab_create_ggc (1009, const_desc_hash
,
5944 const_desc_eq
, NULL
);
5946 const_alias_set
= new_alias_set ();
5947 shared_constant_pool
= create_constant_pool ();
5949 #ifdef TEXT_SECTION_ASM_OP
5950 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
5951 TEXT_SECTION_ASM_OP
);
5954 #ifdef DATA_SECTION_ASM_OP
5955 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5956 DATA_SECTION_ASM_OP
);
5959 #ifdef SDATA_SECTION_ASM_OP
5960 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5961 SDATA_SECTION_ASM_OP
);
5964 #ifdef READONLY_DATA_SECTION_ASM_OP
5965 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
5966 READONLY_DATA_SECTION_ASM_OP
);
5969 #ifdef CTORS_SECTION_ASM_OP
5970 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
5971 CTORS_SECTION_ASM_OP
);
5974 #ifdef DTORS_SECTION_ASM_OP
5975 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
5976 DTORS_SECTION_ASM_OP
);
5979 #ifdef BSS_SECTION_ASM_OP
5980 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5981 output_section_asm_op
,
5982 BSS_SECTION_ASM_OP
);
5985 #ifdef SBSS_SECTION_ASM_OP
5986 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5987 output_section_asm_op
,
5988 SBSS_SECTION_ASM_OP
);
5991 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5992 | SECTION_COMMON
, emit_tls_common
);
5993 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5994 | SECTION_COMMON
, emit_local
);
5995 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5996 | SECTION_COMMON
, emit_common
);
5998 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
5999 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
6003 targetm
.asm_out
.init_sections ();
6005 if (readonly_data_section
== NULL
)
6006 readonly_data_section
= text_section
;
6010 decl_default_tls_model (const_tree decl
)
6012 enum tls_model kind
;
6015 is_local
= targetm
.binds_local_p (decl
);
6019 kind
= TLS_MODEL_LOCAL_EXEC
;
6021 kind
= TLS_MODEL_INITIAL_EXEC
;
6024 /* Local dynamic is inefficient when we're not combining the
6025 parts of the address. */
6026 else if (optimize
&& is_local
)
6027 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
6029 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
6030 if (kind
< flag_tls_default
)
6031 kind
= flag_tls_default
;
6036 /* Select a set of attributes for section NAME based on the properties
6037 of DECL and whether or not RELOC indicates that DECL's initializer
6038 might contain runtime relocations.
6040 We make the section read-only and executable for a function decl,
6041 read-only for a const data decl, and writable for a non-const data decl. */
6044 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6048 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6049 flags
= SECTION_CODE
;
6052 enum section_category category
6053 = categorize_decl_for_section (decl
, reloc
);
6054 if (decl_readonly_section_1 (category
))
6056 else if (category
== SECCAT_DATA_REL_RO
6057 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6058 flags
= SECTION_WRITE
| SECTION_RELRO
;
6060 flags
= SECTION_WRITE
;
6064 flags
= SECTION_WRITE
;
6065 if (strcmp (name
, ".data.rel.ro") == 0
6066 || strcmp (name
, ".data.rel.ro.local") == 0)
6067 flags
|= SECTION_RELRO
;
6070 if (decl
&& DECL_ONE_ONLY (decl
))
6071 flags
|= SECTION_LINKONCE
;
6073 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6074 flags
|= SECTION_TLS
| SECTION_WRITE
;
6076 if (strcmp (name
, ".bss") == 0
6077 || strncmp (name
, ".bss.", 5) == 0
6078 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6079 || strcmp (name
, ".sbss") == 0
6080 || strncmp (name
, ".sbss.", 6) == 0
6081 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6082 flags
|= SECTION_BSS
;
6084 if (strcmp (name
, ".tdata") == 0
6085 || strncmp (name
, ".tdata.", 7) == 0
6086 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6087 flags
|= SECTION_TLS
;
6089 if (strcmp (name
, ".tbss") == 0
6090 || strncmp (name
, ".tbss.", 6) == 0
6091 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6092 flags
|= SECTION_TLS
| SECTION_BSS
;
6094 /* These three sections have special ELF types. They are neither
6095 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6096 want to print a section type (@progbits or @nobits). If someone
6097 is silly enough to emit code or TLS variables to one of these
6098 sections, then don't handle them specially. */
6099 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6100 && (strcmp (name
, ".init_array") == 0
6101 || strcmp (name
, ".fini_array") == 0
6102 || strcmp (name
, ".preinit_array") == 0))
6103 flags
|= SECTION_NOTYPE
;
6108 /* Return true if the target supports some form of global BSS,
6109 either through bss_noswitch_section, or by selecting a BSS
6110 section in TARGET_ASM_SELECT_SECTION. */
6113 have_global_bss_p (void)
6115 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6118 /* Output assembly to switch to section NAME with attribute FLAGS.
6119 Four variants for common object file formats. */
6122 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6123 unsigned int flags ATTRIBUTE_UNUSED
,
6124 tree decl ATTRIBUTE_UNUSED
)
6126 /* Some object formats don't support named sections at all. The
6127 front-end should already have flagged this as an error. */
6131 #ifndef TLS_SECTION_ASM_FLAG
6132 #define TLS_SECTION_ASM_FLAG 'T'
6136 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6137 tree decl ATTRIBUTE_UNUSED
)
6139 char flagchars
[10], *f
= flagchars
;
6141 /* If we have already declared this section, we can use an
6142 abbreviated form to switch back to it -- unless this section is
6143 part of a COMDAT groups, in which case GAS requires the full
6144 declaration every time. */
6145 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6146 && (flags
& SECTION_DECLARED
))
6148 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6152 if (!(flags
& SECTION_DEBUG
))
6154 if (flags
& SECTION_WRITE
)
6156 if (flags
& SECTION_CODE
)
6158 if (flags
& SECTION_SMALL
)
6160 if (flags
& SECTION_MERGE
)
6162 if (flags
& SECTION_STRINGS
)
6164 if (flags
& SECTION_TLS
)
6165 *f
++ = TLS_SECTION_ASM_FLAG
;
6166 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6170 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6172 if (!(flags
& SECTION_NOTYPE
))
6177 if (flags
& SECTION_BSS
)
6183 #ifdef ASM_COMMENT_START
6184 /* On platforms that use "@" as the assembly comment character,
6186 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6189 fprintf (asm_out_file
, format
, type
);
6191 if (flags
& SECTION_ENTSIZE
)
6192 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6193 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6195 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6196 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6198 fprintf (asm_out_file
, ",%s,comdat",
6199 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6203 putc ('\n', asm_out_file
);
6207 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6208 tree decl ATTRIBUTE_UNUSED
)
6210 char flagchars
[8], *f
= flagchars
;
6212 if (flags
& SECTION_WRITE
)
6214 if (flags
& SECTION_CODE
)
6218 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6222 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6225 default_coff_asm_named_section (name
, flags
, decl
);
6227 if (flags
& SECTION_LINKONCE
)
6229 /* Functions may have been compiled at various levels of
6230 optimization so we can't use `same_size' here.
6231 Instead, have the linker pick one. */
6232 fprintf (asm_out_file
, "\t.linkonce %s\n",
6233 (flags
& SECTION_CODE
? "discard" : "same_size"));
6237 /* The lame default section selector. */
6240 default_select_section (tree decl
, int reloc
,
6241 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6245 if (decl_readonly_section (decl
, reloc
))
6246 return readonly_data_section
;
6248 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6250 if (! ((flag_pic
&& reloc
)
6251 || !TREE_READONLY (decl
)
6252 || TREE_SIDE_EFFECTS (decl
)
6253 || !TREE_CONSTANT (decl
)))
6254 return readonly_data_section
;
6256 else if (TREE_CODE (decl
) == STRING_CST
)
6257 return readonly_data_section
;
6258 else if (! (flag_pic
&& reloc
))
6259 return readonly_data_section
;
6261 return data_section
;
6264 enum section_category
6265 categorize_decl_for_section (const_tree decl
, int reloc
)
6267 enum section_category ret
;
6269 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6271 else if (TREE_CODE (decl
) == STRING_CST
)
6273 if (flag_mudflap
) /* or !flag_merge_constants */
6274 return SECCAT_RODATA
;
6276 return SECCAT_RODATA_MERGE_STR
;
6278 else if (TREE_CODE (decl
) == VAR_DECL
)
6280 if (bss_initializer_p (decl
))
6282 else if (! TREE_READONLY (decl
)
6283 || TREE_SIDE_EFFECTS (decl
)
6284 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6286 /* Here the reloc_rw_mask is not testing whether the section should
6287 be read-only or not, but whether the dynamic link will have to
6288 do something. If so, we wish to segregate the data in order to
6289 minimize cache misses inside the dynamic linker. */
6290 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6291 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6295 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6296 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6297 else if (reloc
|| flag_merge_constants
< 2)
6298 /* C and C++ don't allow different variables to share the same
6299 location. -fmerge-all-constants allows even that (at the
6300 expense of not conforming). */
6301 ret
= SECCAT_RODATA
;
6302 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6303 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6305 ret
= SECCAT_RODATA_MERGE_CONST
;
6307 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6309 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6310 || TREE_SIDE_EFFECTS (decl
)
6311 || ! TREE_CONSTANT (decl
))
6314 ret
= SECCAT_RODATA
;
6317 ret
= SECCAT_RODATA
;
6319 /* There are no read-only thread-local sections. */
6320 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6322 /* Note that this would be *just* SECCAT_BSS, except that there's
6323 no concept of a read-only thread-local-data section. */
6324 if (ret
== SECCAT_BSS
6325 || (flag_zero_initialized_in_bss
6326 && initializer_zerop (DECL_INITIAL (decl
))))
6332 /* If the target uses small data sections, select it. */
6333 else if (targetm
.in_small_data_p (decl
))
6335 if (ret
== SECCAT_BSS
)
6337 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6338 ret
= SECCAT_SRODATA
;
6347 decl_readonly_section_1 (enum section_category category
)
6352 case SECCAT_RODATA_MERGE_STR
:
6353 case SECCAT_RODATA_MERGE_STR_INIT
:
6354 case SECCAT_RODATA_MERGE_CONST
:
6355 case SECCAT_SRODATA
:
6363 decl_readonly_section (const_tree decl
, int reloc
)
6365 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6368 /* Select a section based on the above categorization. */
6371 default_elf_select_section (tree decl
, int reloc
,
6372 unsigned HOST_WIDE_INT align
)
6375 switch (categorize_decl_for_section (decl
, reloc
))
6378 /* We're not supposed to be called on FUNCTION_DECLs. */
6381 return readonly_data_section
;
6382 case SECCAT_RODATA_MERGE_STR
:
6383 return mergeable_string_section (decl
, align
, 0);
6384 case SECCAT_RODATA_MERGE_STR_INIT
:
6385 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6386 case SECCAT_RODATA_MERGE_CONST
:
6387 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6388 case SECCAT_SRODATA
:
6392 return data_section
;
6393 case SECCAT_DATA_REL
:
6394 sname
= ".data.rel";
6396 case SECCAT_DATA_REL_LOCAL
:
6397 sname
= ".data.rel.local";
6399 case SECCAT_DATA_REL_RO
:
6400 sname
= ".data.rel.ro";
6402 case SECCAT_DATA_REL_RO_LOCAL
:
6403 sname
= ".data.rel.ro.local";
6428 return get_named_section (decl
, sname
, reloc
);
6431 /* Construct a unique section name based on the decl name and the
6432 categorization performed above. */
6435 default_unique_section (tree decl
, int reloc
)
6437 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6438 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6439 const char *prefix
, *name
, *linkonce
;
6442 switch (categorize_decl_for_section (decl
, reloc
))
6445 prefix
= one_only
? ".t" : ".text";
6448 case SECCAT_RODATA_MERGE_STR
:
6449 case SECCAT_RODATA_MERGE_STR_INIT
:
6450 case SECCAT_RODATA_MERGE_CONST
:
6451 prefix
= one_only
? ".r" : ".rodata";
6453 case SECCAT_SRODATA
:
6454 prefix
= one_only
? ".s2" : ".sdata2";
6457 prefix
= one_only
? ".d" : ".data";
6459 case SECCAT_DATA_REL
:
6460 prefix
= one_only
? ".d.rel" : ".data.rel";
6462 case SECCAT_DATA_REL_LOCAL
:
6463 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6465 case SECCAT_DATA_REL_RO
:
6466 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6468 case SECCAT_DATA_REL_RO_LOCAL
:
6469 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6472 prefix
= one_only
? ".s" : ".sdata";
6475 prefix
= one_only
? ".b" : ".bss";
6478 prefix
= one_only
? ".sb" : ".sbss";
6481 prefix
= one_only
? ".td" : ".tdata";
6484 prefix
= one_only
? ".tb" : ".tbss";
6490 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
6491 name
= targetm
.strip_name_encoding (name
);
6493 /* If we're using one_only, then there needs to be a .gnu.linkonce
6494 prefix to the section name. */
6495 linkonce
= one_only
? ".gnu.linkonce" : "";
6497 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6499 DECL_SECTION_NAME (decl
) = build_string (strlen (string
), string
);
6502 /* Like compute_reloc_for_constant, except for an RTX. The return value
6503 is a mask for which bit 1 indicates a global relocation, and bit 0
6504 indicates a local relocation. */
6507 compute_reloc_for_rtx_1 (rtx
*xp
, void *data
)
6509 int *preloc
= (int *) data
;
6512 switch (GET_CODE (x
))
6515 *preloc
|= SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6528 compute_reloc_for_rtx (rtx x
)
6532 switch (GET_CODE (x
))
6538 for_each_rtx (&x
, compute_reloc_for_rtx_1
, &reloc
);
6547 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
6549 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6551 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6552 return data_section
;
6554 return readonly_data_section
;
6558 default_elf_select_rtx_section (enum machine_mode mode
, rtx x
,
6559 unsigned HOST_WIDE_INT align
)
6561 int reloc
= compute_reloc_for_rtx (x
);
6563 /* ??? Handle small data here somehow. */
6565 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6568 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6570 return get_named_section (NULL
, ".data.rel.ro", 3);
6573 return mergeable_constant_section (mode
, align
, 0);
6576 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6579 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6584 /* Careful not to prod global register variables. */
6587 symbol
= XEXP (rtl
, 0);
6588 if (GET_CODE (symbol
) != SYMBOL_REF
)
6591 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6592 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6593 flags
|= SYMBOL_FLAG_FUNCTION
;
6594 if (targetm
.binds_local_p (decl
))
6595 flags
|= SYMBOL_FLAG_LOCAL
;
6596 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6597 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6598 else if (targetm
.in_small_data_p (decl
))
6599 flags
|= SYMBOL_FLAG_SMALL
;
6600 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6601 being PUBLIC, the thing *must* be defined in this translation unit.
6602 Prevent this buglet from being propagated into rtl code as well. */
6603 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6604 flags
|= SYMBOL_FLAG_EXTERNAL
;
6606 SYMBOL_REF_FLAGS (symbol
) = flags
;
6609 /* By default, we do nothing for encode_section_info, so we need not
6610 do anything but discard the '*' marker. */
6613 default_strip_name_encoding (const char *str
)
6615 return str
+ (*str
== '*');
6618 #ifdef ASM_OUTPUT_DEF
6619 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6620 anchor relative to ".", the current section position. */
6623 default_asm_output_anchor (rtx symbol
)
6627 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6628 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6629 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6633 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6636 default_use_anchors_for_symbol_p (const_rtx symbol
)
6641 /* Don't use anchors for mergeable sections. The linker might move
6642 the objects around. */
6643 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6644 if (sect
->common
.flags
& SECTION_MERGE
)
6647 /* Don't use anchors for small data sections. The small data register
6648 acts as an anchor for such sections. */
6649 if (sect
->common
.flags
& SECTION_SMALL
)
6652 decl
= SYMBOL_REF_DECL (symbol
);
6653 if (decl
&& DECL_P (decl
))
6655 /* Don't use section anchors for decls that might be defined by
6657 if (!targetm
.binds_local_p (decl
))
6660 /* Don't use section anchors for decls that will be placed in a
6661 small data section. */
6662 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6663 one above. The problem is that we only use SECTION_SMALL for
6664 sections that should be marked as small in the section directive. */
6665 if (targetm
.in_small_data_p (decl
))
6671 /* Return true when RESOLUTION indicate that symbol will be bound to the
6672 definition provided by current .o file. */
6675 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6677 return (resolution
== LDPR_PREVAILING_DEF
6678 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6681 /* Return true when RESOLUTION indicate that symbol will be bound locally
6682 within current executable or DSO. */
6685 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6687 return (resolution
== LDPR_PREVAILING_DEF
6688 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6689 || resolution
== LDPR_PREEMPTED_REG
6690 || resolution
== LDPR_PREEMPTED_IR
6691 || resolution
== LDPR_RESOLVED_IR
6692 || resolution
== LDPR_RESOLVED_EXEC
);
6695 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6696 wrt cross-module name binding. */
6699 default_binds_local_p (const_tree exp
)
6701 return default_binds_local_p_1 (exp
, flag_shlib
);
6705 default_binds_local_p_1 (const_tree exp
, int shlib
)
6708 bool resolved_locally
= false;
6709 bool resolved_to_local_def
= false;
6711 /* With resolution file in hands, take look into resolutions.
6712 We can't just return true for resolved_localy symbols,
6713 because dynamic linking might overwrite symbols
6714 in shared libraries. */
6715 if (TREE_CODE (exp
) == VAR_DECL
&& TREE_PUBLIC (exp
)
6716 && (TREE_STATIC (exp
) || DECL_EXTERNAL (exp
)))
6718 struct varpool_node
*vnode
= varpool_get_node (exp
);
6719 if (vnode
&& resolution_local_p (vnode
->resolution
))
6720 resolved_locally
= true;
6722 && resolution_to_local_definition_p (vnode
->resolution
))
6723 resolved_to_local_def
= true;
6725 else if (TREE_CODE (exp
) == FUNCTION_DECL
&& TREE_PUBLIC (exp
))
6727 struct cgraph_node
*node
= cgraph_get_node_or_alias (exp
);
6729 && resolution_local_p (node
->resolution
))
6730 resolved_locally
= true;
6732 && resolution_to_local_definition_p (node
->resolution
))
6733 resolved_to_local_def
= true;
6736 /* A non-decl is an entry in the constant pool. */
6739 /* Weakrefs may not bind locally, even though the weakref itself is
6740 always static and therefore local.
6741 FIXME: We can resolve this more curefuly by looking at the weakref
6743 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
)))
6745 /* Static variables are always local. */
6746 else if (! TREE_PUBLIC (exp
))
6748 /* A variable is local if the user has said explicitly that it will
6750 else if ((DECL_VISIBILITY_SPECIFIED (exp
)
6751 || resolved_to_local_def
)
6752 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6754 /* Variables defined outside this object might not be local. */
6755 else if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6757 /* If defined in this object and visibility is not default, must be
6759 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6761 /* Default visibility weak data can be overridden by a strong symbol
6762 in another module and so are not local. */
6763 else if (DECL_WEAK (exp
)
6764 && !resolved_locally
)
6766 /* If PIC, then assume that any global name can be overridden by
6767 symbols resolved from other modules. */
6770 /* Uninitialized COMMON variable may be unified with symbols
6771 resolved from other modules. */
6772 else if (DECL_COMMON (exp
)
6773 && !resolved_locally
6774 && (DECL_INITIAL (exp
) == NULL
6775 || DECL_INITIAL (exp
) == error_mark_node
))
6777 /* Otherwise we're left with initialized (or non-common) global data
6778 which is of necessity defined locally. */
6785 /* Return true when references to DECL must bind to current definition in
6788 The condition is usually equivalent to whether the function binds to the
6789 current module (shared library or executable), that is to binds_local_p.
6790 We use this fact to avoid need for another target hook and implement
6791 the logic using binds_local_p and just special cases where
6792 decl_binds_to_current_def_p is stronger than binds local_p. In particular
6793 the weak definitions (that can be overwritten at linktime by other
6794 definition from different object file) and when resolution info is available
6795 we simply use the knowledge passed to us by linker plugin. */
6797 decl_binds_to_current_def_p (tree decl
)
6799 gcc_assert (DECL_P (decl
));
6800 if (!TREE_PUBLIC (decl
))
6802 if (!targetm
.binds_local_p (decl
))
6804 /* When resolution is available, just use it. */
6805 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_PUBLIC (decl
)
6806 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)))
6808 struct varpool_node
*vnode
= varpool_get_node (decl
);
6810 && vnode
->resolution
!= LDPR_UNKNOWN
)
6811 return resolution_to_local_definition_p (vnode
->resolution
);
6813 else if (TREE_CODE (decl
) == FUNCTION_DECL
&& TREE_PUBLIC (decl
))
6815 struct cgraph_node
*node
= cgraph_get_node_or_alias (decl
);
6817 && node
->resolution
!= LDPR_UNKNOWN
)
6818 return resolution_to_local_definition_p (node
->resolution
);
6820 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6821 binds localy but still can be overwritten).
6822 This rely on fact that binds_local_p behave as decl_replaceable_p
6823 for all other declaration types. */
6824 return !DECL_WEAK (decl
);
6827 /* A replaceable function or variable is one which may be replaced
6828 at link-time with an entirely different definition, provided that the
6829 replacement has the same type. For example, functions declared
6830 with __attribute__((weak)) on most systems are replaceable.
6832 COMDAT functions are not replaceable, since all definitions of the
6833 function must be equivalent. It is important that COMDAT functions
6834 not be treated as replaceable so that use of C++ template
6835 instantiations is not penalized. */
6838 decl_replaceable_p (tree decl
)
6840 gcc_assert (DECL_P (decl
));
6841 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
6843 return !decl_binds_to_current_def_p (decl
);
6846 /* Default function to output code that will globalize a label. A
6847 target must define GLOBAL_ASM_OP or provide its own function to
6848 globalize a label. */
6849 #ifdef GLOBAL_ASM_OP
6851 default_globalize_label (FILE * stream
, const char *name
)
6853 fputs (GLOBAL_ASM_OP
, stream
);
6854 assemble_name (stream
, name
);
6855 putc ('\n', stream
);
6857 #endif /* GLOBAL_ASM_OP */
6859 /* Default function to output code that will globalize a declaration. */
6861 default_globalize_decl_name (FILE * stream
, tree decl
)
6863 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6864 targetm
.asm_out
.globalize_label (stream
, name
);
6867 /* Default function to output a label for unwind information. The
6868 default is to do nothing. A target that needs nonlocal labels for
6869 unwind information must provide its own function to do this. */
6871 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6872 tree decl ATTRIBUTE_UNUSED
,
6873 int for_eh ATTRIBUTE_UNUSED
,
6874 int empty ATTRIBUTE_UNUSED
)
6878 /* Default function to output a label to divide up the exception table.
6879 The default is to do nothing. A target that needs/wants to divide
6880 up the table must provide it's own function to do this. */
6882 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
6886 /* This is how to output an internal numbered label where PREFIX is
6887 the class of label and LABELNO is the number within the class. */
6890 default_generate_internal_label (char *buf
, const char *prefix
,
6891 unsigned long labelno
)
6893 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6896 /* This is how to output an internal numbered label where PREFIX is
6897 the class of label and LABELNO is the number within the class. */
6900 default_internal_label (FILE *stream
, const char *prefix
,
6901 unsigned long labelno
)
6903 char *const buf
= (char *) alloca (40 + strlen (prefix
));
6904 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6905 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
6909 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
6912 default_asm_declare_constant_name (FILE *file
, const char *name
,
6913 const_tree exp ATTRIBUTE_UNUSED
,
6914 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
6916 assemble_label (file
, name
);
6919 /* This is the default behavior at the beginning of a file. It's
6920 controlled by two other target-hook toggles. */
6922 default_file_start (void)
6924 if (targetm
.asm_file_start_app_off
6925 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
6926 fputs (ASM_APP_OFF
, asm_out_file
);
6928 if (targetm
.asm_file_start_file_directive
)
6929 output_file_directive (asm_out_file
, main_input_filename
);
6932 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6933 which emits a special section directive used to indicate whether or
6934 not this object file needs an executable stack. This is primarily
6935 a GNU extension to ELF but could be used on other targets. */
6937 int trampolines_created
;
6940 file_end_indicate_exec_stack (void)
6942 unsigned int flags
= SECTION_DEBUG
;
6943 if (trampolines_created
)
6944 flags
|= SECTION_CODE
;
6946 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
6949 /* Emit a special section directive to indicate that this object file
6950 was compiled with -fsplit-stack. This is used to let the linker
6951 detect calls between split-stack code and non-split-stack code, so
6952 that it can modify the split-stack code to allocate a sufficiently
6953 large stack. We emit another special section if there are any
6954 functions in this file which have the no_split_stack attribute, to
6955 prevent the linker from warning about being unable to convert the
6956 functions if they call non-split-stack code. */
6959 file_end_indicate_split_stack (void)
6961 if (flag_split_stack
)
6963 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
6965 if (saw_no_split_stack
)
6966 switch_to_section (get_section (".note.GNU-no-split-stack",
6967 SECTION_DEBUG
, NULL
));
6971 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6972 a get_unnamed_section callback. */
6975 output_section_asm_op (const void *directive
)
6977 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
6980 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6981 the current section is NEW_SECTION. */
6984 switch_to_section (section
*new_section
)
6986 if (in_section
== new_section
)
6989 if (new_section
->common
.flags
& SECTION_FORGET
)
6992 in_section
= new_section
;
6994 switch (SECTION_STYLE (new_section
))
6997 targetm
.asm_out
.named_section (new_section
->named
.name
,
6998 new_section
->named
.common
.flags
,
6999 new_section
->named
.decl
);
7002 case SECTION_UNNAMED
:
7003 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
7006 case SECTION_NOSWITCH
:
7011 new_section
->common
.flags
|= SECTION_DECLARED
;
7014 /* If block symbol SYMBOL has not yet been assigned an offset, place
7015 it at the end of its block. */
7018 place_block_symbol (rtx symbol
)
7020 unsigned HOST_WIDE_INT size
, mask
, offset
;
7021 struct constant_descriptor_rtx
*desc
;
7022 unsigned int alignment
;
7023 struct object_block
*block
;
7026 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7027 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7030 /* Work out the symbol's size and alignment. */
7031 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7033 desc
= SYMBOL_REF_CONSTANT (symbol
);
7034 alignment
= desc
->align
;
7035 size
= GET_MODE_SIZE (desc
->mode
);
7037 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7039 decl
= SYMBOL_REF_DECL (symbol
);
7040 alignment
= DECL_ALIGN (decl
);
7041 size
= get_constant_size (DECL_INITIAL (decl
));
7045 decl
= SYMBOL_REF_DECL (symbol
);
7046 alignment
= DECL_ALIGN (decl
);
7047 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
7050 /* Calculate the object's offset from the start of the block. */
7051 block
= SYMBOL_REF_BLOCK (symbol
);
7052 mask
= alignment
/ BITS_PER_UNIT
- 1;
7053 offset
= (block
->size
+ mask
) & ~mask
;
7054 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7056 /* Record the block's new alignment and size. */
7057 block
->alignment
= MAX (block
->alignment
, alignment
);
7058 block
->size
= offset
+ size
;
7060 VEC_safe_push (rtx
, gc
, block
->objects
, symbol
);
7063 /* Return the anchor that should be used to address byte offset OFFSET
7064 from the first object in BLOCK. MODEL is the TLS model used
7068 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7069 enum tls_model model
)
7072 unsigned int begin
, middle
, end
;
7073 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7076 /* Work out the anchor's offset. Use an offset of 0 for the first
7077 anchor so that we don't pessimize the case where we take the address
7078 of a variable at the beginning of the block. This is particularly
7079 useful when a block has only one variable assigned to it.
7081 We try to place anchors RANGE bytes apart, so there can then be
7082 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7083 a ptr_mode offset. With some target settings, the lowest such
7084 anchor might be out of range for the lowest ptr_mode offset;
7085 likewise the highest anchor for the highest offset. Use anchors
7086 at the extreme ends of the ptr_mode range in such cases.
7088 All arithmetic uses unsigned integers in order to avoid
7090 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7091 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7092 range
= max_offset
- min_offset
+ 1;
7097 bias
= 1 << (GET_MODE_BITSIZE (ptr_mode
) - 1);
7100 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7101 delta
-= delta
% range
;
7104 offset
= (HOST_WIDE_INT
) (-delta
);
7108 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7109 delta
-= delta
% range
;
7110 if (delta
> bias
- 1)
7112 offset
= (HOST_WIDE_INT
) delta
;
7116 /* Do a binary search to see if there's already an anchor we can use.
7117 Set BEGIN to the new anchor's index if not. */
7119 end
= VEC_length (rtx
, block
->anchors
);
7120 while (begin
!= end
)
7122 middle
= (end
+ begin
) / 2;
7123 anchor
= VEC_index (rtx
, block
->anchors
, middle
);
7124 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7126 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7128 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7130 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7136 /* Create a new anchor with a unique label. */
7137 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7138 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7139 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7140 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7142 /* Insert it at index BEGIN. */
7143 VEC_safe_insert (rtx
, gc
, block
->anchors
, begin
, anchor
);
7147 /* Output the objects in BLOCK. */
7150 output_object_block (struct object_block
*block
)
7152 struct constant_descriptor_rtx
*desc
;
7154 HOST_WIDE_INT offset
;
7158 if (block
->objects
== NULL
)
7161 /* Switch to the section and make sure that the first byte is
7162 suitably aligned. */
7163 switch_to_section (block
->sect
);
7164 assemble_align (block
->alignment
);
7166 /* Define the values of all anchors relative to the current section
7168 FOR_EACH_VEC_ELT (rtx
, block
->anchors
, i
, symbol
)
7169 targetm
.asm_out
.output_anchor (symbol
);
7171 /* Output the objects themselves. */
7173 FOR_EACH_VEC_ELT (rtx
, block
->objects
, i
, symbol
)
7175 /* Move to the object's offset, padding with zeros if necessary. */
7176 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7177 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7178 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7180 desc
= SYMBOL_REF_CONSTANT (symbol
);
7181 output_constant_pool_1 (desc
, 1);
7182 offset
+= GET_MODE_SIZE (desc
->mode
);
7184 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7186 decl
= SYMBOL_REF_DECL (symbol
);
7187 assemble_constant_contents (DECL_INITIAL (decl
), XSTR (symbol
, 0),
7189 offset
+= get_constant_size (DECL_INITIAL (decl
));
7193 decl
= SYMBOL_REF_DECL (symbol
);
7194 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7195 offset
+= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
7200 /* A htab_traverse callback used to call output_object_block for
7201 each member of object_block_htab. */
7204 output_object_block_htab (void **slot
, void *data ATTRIBUTE_UNUSED
)
7206 output_object_block ((struct object_block
*) (*slot
));
7210 /* Output the definitions of all object_blocks. */
7213 output_object_blocks (void)
7215 htab_traverse (object_block_htab
, output_object_block_htab
, NULL
);
7218 /* This function provides a possible implementation of the
7219 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7220 by -frecord-gcc-switches it creates a new mergeable, string section in the
7221 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7222 contains the switches in ASCII format.
7224 FIXME: This code does not correctly handle double quote characters
7225 that appear inside strings, (it strips them rather than preserving them).
7226 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7227 characters - instead it treats them as sub-string separators. Since
7228 we want to emit NUL strings terminators into the object file we have to use
7232 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7236 case SWITCH_TYPE_PASSED
:
7237 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7238 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7241 case SWITCH_TYPE_DESCRIPTIVE
:
7244 /* Distinguish between invocations where name is NULL. */
7245 static bool started
= false;
7251 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7255 | (SECTION_ENTSIZE
& 1),
7257 switch_to_section (sec
);
7266 /* The return value is currently ignored by the caller, but must be 0.
7267 For -fverbose-asm the return value would be the number of characters
7268 emitted into the assembler file. */
7272 /* Emit text to declare externally defined symbols. It is needed to
7273 properly support non-default visibility. */
7275 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7277 const char *name ATTRIBUTE_UNUSED
)
7279 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7280 set in order to avoid putting out names that are never really
7282 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7283 && targetm
.binds_local_p (decl
))
7284 maybe_assemble_visibility (decl
);
7287 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7290 default_asm_output_source_filename (FILE *file
, const char *name
)
7292 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7293 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7295 fprintf (file
, "\t.file\t");
7296 output_quoted_string (file
, name
);
7301 /* Output a file name in the form wanted by System V. */
7304 output_file_directive (FILE *asm_file
, const char *input_name
)
7309 if (input_name
== NULL
)
7310 input_name
= "<stdin>";
7312 input_name
= remap_debug_filename (input_name
);
7314 len
= strlen (input_name
);
7315 na
= input_name
+ len
;
7317 /* NA gets INPUT_NAME sans directory names. */
7318 while (na
> input_name
)
7320 if (IS_DIR_SEPARATOR (na
[-1]))
7325 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7328 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7331 make_debug_expr_from_rtl (const_rtx exp
)
7333 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7334 enum machine_mode mode
= GET_MODE (exp
);
7337 DECL_ARTIFICIAL (ddecl
) = 1;
7338 if (REG_P (exp
) && REG_EXPR (exp
))
7339 type
= TREE_TYPE (REG_EXPR (exp
));
7340 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7341 type
= TREE_TYPE (MEM_EXPR (exp
));
7344 if (type
&& TYPE_MODE (type
) == mode
)
7345 TREE_TYPE (ddecl
) = type
;
7347 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7348 DECL_MODE (ddecl
) = mode
;
7349 dval
= gen_rtx_DEBUG_EXPR (mode
);
7350 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7351 SET_DECL_RTL (ddecl
, dval
);
7355 #include "gt-varasm.h"