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, 2012 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 "common/common-target.h"
50 #include "targhooks.h"
51 #include "tree-mudflap.h"
53 #include "pointer-set.h"
56 #ifdef XCOFF_DEBUGGING_INFO
57 #include "xcoffout.h" /* Needed for external data
58 declarations for e.g. AIX 4.x. */
61 /* The (assembler) name of the first globally-visible object output. */
62 extern GTY(()) const char *first_global_object_name
;
63 extern GTY(()) const char *weak_global_object_name
;
65 const char *first_global_object_name
;
66 const char *weak_global_object_name
;
69 struct constant_descriptor_rtx
;
70 struct rtx_constant_pool
;
72 #define n_deferred_constants (crtl->varasm.deferred_constants)
74 /* Number for making the label on the next
75 constant that is stored in memory. */
77 static GTY(()) int const_labelno
;
79 /* Carry information from ASM_DECLARE_OBJECT_NAME
80 to ASM_FINISH_DECLARE_OBJECT. */
82 int size_directive_output
;
84 /* The last decl for which assemble_variable was called,
85 if it did ASM_DECLARE_OBJECT_NAME.
86 If the last call to assemble_variable didn't do that,
89 tree last_assemble_variable_decl
;
91 /* The following global variable indicates if the first basic block
92 in a function belongs to the cold partition or not. */
94 bool first_function_block_is_cold
;
96 /* We give all constants their own alias set. Perhaps redundant with
97 MEM_READONLY_P, but pre-dates it. */
99 static alias_set_type const_alias_set
;
101 /* Whether we saw any functions with no_split_stack. */
103 static bool saw_no_split_stack
;
105 static const char *strip_reg_name (const char *);
106 static int contains_pointers_p (tree
);
107 #ifdef ASM_OUTPUT_EXTERNAL
108 static bool incorporeal_function_p (tree
);
110 static void decode_addr_const (tree
, struct addr_const
*);
111 static hashval_t
const_desc_hash (const void *);
112 static int const_desc_eq (const void *, const void *);
113 static hashval_t
const_hash_1 (const tree
);
114 static int compare_constant (const tree
, const tree
);
115 static tree
copy_constant (tree
);
116 static void output_constant_def_contents (rtx
);
117 static void output_addressed_constants (tree
);
118 static unsigned HOST_WIDE_INT
array_size_for_constructor (tree
);
119 static unsigned min_align (unsigned, unsigned);
120 static void globalize_decl (tree
);
121 static bool decl_readonly_section_1 (enum section_category
);
122 #ifdef BSS_SECTION_ASM_OP
123 #ifdef ASM_OUTPUT_ALIGNED_BSS
124 static void asm_output_aligned_bss (FILE *, tree
, const char *,
125 unsigned HOST_WIDE_INT
, int)
128 #endif /* BSS_SECTION_ASM_OP */
129 static void mark_weak (tree
);
130 static void output_constant_pool (const char *, tree
);
132 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
133 section
*text_section
;
134 section
*data_section
;
135 section
*readonly_data_section
;
136 section
*sdata_section
;
137 section
*ctors_section
;
138 section
*dtors_section
;
139 section
*bss_section
;
140 section
*sbss_section
;
142 /* Various forms of common section. All are guaranteed to be nonnull. */
143 section
*tls_comm_section
;
144 section
*comm_section
;
145 section
*lcomm_section
;
147 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
149 section
*bss_noswitch_section
;
151 /* The section that holds the main exception table, when known. The section
152 is set either by the target's init_sections hook or by the first call to
153 switch_to_exception_section. */
154 section
*exception_section
;
156 /* The section that holds the DWARF2 frame unwind information, when known.
157 The section is set either by the target's init_sections hook or by the
158 first call to switch_to_eh_frame_section. */
159 section
*eh_frame_section
;
161 /* asm_out_file's current section. This is NULL if no section has yet
162 been selected or if we lose track of what the current section is. */
165 /* True if code for the current function is currently being directed
166 at the cold section. */
167 bool in_cold_section_p
;
169 /* A linked list of all the unnamed sections. */
170 static GTY(()) section
*unnamed_sections
;
172 /* Return a nonzero value if DECL has a section attribute. */
173 #define IN_NAMED_SECTION(DECL) \
174 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
175 && DECL_SECTION_NAME (DECL) != NULL_TREE)
177 /* Hash table of named sections. */
178 static GTY((param_is (section
))) htab_t section_htab
;
180 /* A table of object_blocks, indexed by section. */
181 static GTY((param_is (struct object_block
))) htab_t object_block_htab
;
183 /* The next number to use for internal anchor labels. */
184 static GTY(()) int anchor_labelno
;
186 /* A pool of constants that can be shared between functions. */
187 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
189 /* Helper routines for maintaining section_htab. */
192 section_entry_eq (const void *p1
, const void *p2
)
194 const section
*old
= (const section
*) p1
;
195 const char *new_name
= (const char *) p2
;
197 return strcmp (old
->named
.name
, new_name
) == 0;
201 section_entry_hash (const void *p
)
203 const section
*old
= (const section
*) p
;
204 return htab_hash_string (old
->named
.name
);
207 /* Return a hash value for section SECT. */
210 hash_section (section
*sect
)
212 if (sect
->common
.flags
& SECTION_NAMED
)
213 return htab_hash_string (sect
->named
.name
);
214 return sect
->common
.flags
;
217 /* Helper routines for maintaining object_block_htab. */
220 object_block_entry_eq (const void *p1
, const void *p2
)
222 const struct object_block
*old
= (const struct object_block
*) p1
;
223 const section
*new_section
= (const section
*) p2
;
225 return old
->sect
== new_section
;
229 object_block_entry_hash (const void *p
)
231 const struct object_block
*old
= (const struct object_block
*) p
;
232 return hash_section (old
->sect
);
235 /* Return a new unnamed section with the given fields. */
238 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
243 sect
= ggc_alloc_section ();
244 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
245 sect
->unnamed
.callback
= callback
;
246 sect
->unnamed
.data
= data
;
247 sect
->unnamed
.next
= unnamed_sections
;
249 unnamed_sections
= sect
;
253 /* Return a SECTION_NOSWITCH section with the given fields. */
256 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
260 sect
= ggc_alloc_section ();
261 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
262 sect
->noswitch
.callback
= callback
;
267 /* Return the named section structure associated with NAME. Create
268 a new section with the given fields if no such structure exists. */
271 get_section (const char *name
, unsigned int flags
, tree decl
)
273 section
*sect
, **slot
;
276 htab_find_slot_with_hash (section_htab
, name
,
277 htab_hash_string (name
), INSERT
);
278 flags
|= SECTION_NAMED
;
281 sect
= ggc_alloc_section ();
282 sect
->named
.common
.flags
= flags
;
283 sect
->named
.name
= ggc_strdup (name
);
284 sect
->named
.decl
= decl
;
290 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
291 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
293 /* It is fine if one of the section flags is
294 SECTION_WRITE | SECTION_RELRO and the other has none of these
295 flags (i.e. read-only) in named sections and either the
296 section hasn't been declared yet or has been declared as writable.
297 In that case just make sure the resulting flags are
298 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
300 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
301 == (SECTION_WRITE
| SECTION_RELRO
)
302 && (sect
->common
.flags
303 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
304 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
305 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
306 || (sect
->common
.flags
& SECTION_WRITE
)))
308 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
311 /* Sanity check user variables for flag changes. */
313 decl
= sect
->named
.decl
;
315 if (sect
->named
.decl
== NULL
)
316 error ("%+D causes a section type conflict", decl
);
319 error ("%+D causes a section type conflict with %D",
320 decl
, sect
->named
.decl
);
321 if (decl
!= sect
->named
.decl
)
322 inform (DECL_SOURCE_LOCATION (sect
->named
.decl
),
323 "%qD was declared here", sect
->named
.decl
);
325 /* Make sure we don't error about one section multiple times. */
326 sect
->common
.flags
|= SECTION_OVERRIDE
;
332 /* Return true if the current compilation mode benefits from having
333 objects grouped into blocks. */
336 use_object_blocks_p (void)
338 return flag_section_anchors
;
341 /* Return the object_block structure for section SECT. Create a new
342 structure if we haven't created one already. Return null if SECT
345 static struct object_block
*
346 get_block_for_section (section
*sect
)
348 struct object_block
*block
;
354 slot
= htab_find_slot_with_hash (object_block_htab
, sect
,
355 hash_section (sect
), INSERT
);
356 block
= (struct object_block
*) *slot
;
359 block
= ggc_alloc_cleared_object_block ();
366 /* Create a symbol with label LABEL and place it at byte offset
367 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
368 is not yet known. LABEL must be a garbage-collected string. */
371 create_block_symbol (const char *label
, struct object_block
*block
,
372 HOST_WIDE_INT offset
)
377 /* Create the extended SYMBOL_REF. */
378 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
379 symbol
= ggc_alloc_zone_rtx_def (size
, &rtl_zone
);
381 /* Initialize the normal SYMBOL_REF fields. */
382 memset (symbol
, 0, size
);
383 PUT_CODE (symbol
, SYMBOL_REF
);
384 PUT_MODE (symbol
, Pmode
);
385 XSTR (symbol
, 0) = label
;
386 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
388 /* Initialize the block_symbol stuff. */
389 SYMBOL_REF_BLOCK (symbol
) = block
;
390 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
395 /* Return a section with a particular name and with whatever SECTION_*
396 flags section_type_flags deems appropriate. The name of the section
397 is taken from NAME if nonnull, otherwise it is taken from DECL's
398 DECL_SECTION_NAME. DECL is the decl associated with the section
399 (see the section comment for details) and RELOC is as for
400 section_type_flags. */
403 get_named_section (tree decl
, const char *name
, int reloc
)
407 gcc_assert (!decl
|| DECL_P (decl
));
409 name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
411 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
413 return get_section (name
, flags
, decl
);
416 /* If required, set DECL_SECTION_NAME to a unique name. */
419 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
420 int flag_function_or_data_sections
)
422 if (DECL_SECTION_NAME (decl
) == NULL_TREE
423 && targetm_common
.have_named_sections
424 && (flag_function_or_data_sections
425 || DECL_ONE_ONLY (decl
)))
427 targetm
.asm_out
.unique_section (decl
, reloc
);
428 DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
) = true;
432 #ifdef BSS_SECTION_ASM_OP
434 #ifdef ASM_OUTPUT_ALIGNED_BSS
436 /* Utility function for targets to use in implementing
437 ASM_OUTPUT_ALIGNED_BSS.
438 ??? It is believed that this function will work in most cases so such
439 support is localized here. */
442 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
443 const char *name
, unsigned HOST_WIDE_INT size
,
446 switch_to_section (bss_section
);
447 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
448 #ifdef ASM_DECLARE_OBJECT_NAME
449 last_assemble_variable_decl
= decl
;
450 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
452 /* Standard thing is just output label for the object. */
453 ASM_OUTPUT_LABEL (file
, name
);
454 #endif /* ASM_DECLARE_OBJECT_NAME */
455 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
460 #endif /* BSS_SECTION_ASM_OP */
462 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
463 /* Return the hot section for function DECL. Return text_section for
467 hot_function_section (tree decl
)
469 if (decl
!= NULL_TREE
470 && DECL_SECTION_NAME (decl
) != NULL_TREE
471 && targetm_common
.have_named_sections
)
472 return get_named_section (decl
, NULL
, 0);
478 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
481 When DECL_SECTION_NAME is non-NULL and it is implicit section and
482 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
483 concatenate the name with NAMED_SECTION_SUFFIX.
484 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
487 get_named_text_section (tree decl
,
488 const char *text_section_name
,
489 const char *named_section_suffix
)
491 if (decl
&& DECL_SECTION_NAME (decl
))
493 if (named_section_suffix
)
495 tree dsn
= DECL_SECTION_NAME (decl
);
496 const char *stripped_name
;
499 name
= (char *) alloca (TREE_STRING_LENGTH (dsn
) + 1);
500 memcpy (name
, TREE_STRING_POINTER (dsn
),
501 TREE_STRING_LENGTH (dsn
) + 1);
503 stripped_name
= targetm
.strip_name_encoding (name
);
505 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
506 return get_named_section (decl
, buffer
, 0);
508 else if (DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
))
512 /* Do not try to split gnu_linkonce functions. This gets somewhat
514 if (DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
)
516 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
517 name
= targetm
.strip_name_encoding (name
);
518 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
524 return get_named_section (decl
, text_section_name
, 0);
527 /* Choose named function section based on its frequency. */
530 default_function_section (tree decl
, enum node_frequency freq
,
531 bool startup
, bool exit
)
533 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
534 /* Old GNU linkers have buggy --gc-section support, which sometimes
535 results in .gcc_except_table* sections being garbage collected. */
537 && DECL_SECTION_NAME (decl
)
538 && DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
))
542 if (!flag_reorder_functions
543 || !targetm_common
.have_named_sections
)
545 /* Startup code should go to startup subsection unless it is
546 unlikely executed (this happens especially with function splitting
547 where we can split away unnecessary parts of static constructors. */
548 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
549 return get_named_text_section (decl
, ".text.startup", NULL
);
551 /* Similarly for exit. */
552 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
553 return get_named_text_section (decl
, ".text.exit", NULL
);
555 /* Group cold functions together, similarly for hot code. */
558 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
559 return get_named_text_section (decl
, ".text.unlikely", NULL
);
560 case NODE_FREQUENCY_HOT
:
561 return get_named_text_section (decl
, ".text.hot", NULL
);
567 /* Return the section for function DECL.
569 If DECL is NULL_TREE, return the text section. We can be passed
570 NULL_TREE under some circumstances by dbxout.c at least.
572 If FORCE_COLD is true, return cold function section ignoring
573 the frequency info of cgraph_node. */
576 function_section_1 (tree decl
, bool force_cold
)
578 section
*section
= NULL
;
579 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
580 bool startup
= false, exit
= false;
584 struct cgraph_node
*node
= cgraph_get_node (decl
);
588 freq
= node
->frequency
;
589 startup
= node
->only_called_at_startup
;
590 exit
= node
->only_called_at_exit
;
594 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
596 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
597 if (decl
!= NULL_TREE
598 && DECL_SECTION_NAME (decl
) != NULL_TREE
)
600 if (targetm
.asm_out
.function_section
)
601 section
= targetm
.asm_out
.function_section (decl
, freq
,
605 return get_named_section (decl
, NULL
, 0);
608 return targetm
.asm_out
.select_section
609 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
612 if (targetm
.asm_out
.function_section
)
613 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
616 return hot_function_section (decl
);
620 /* Return the section for function DECL.
622 If DECL is NULL_TREE, return the text section. We can be passed
623 NULL_TREE under some circumstances by dbxout.c at least. */
626 function_section (tree decl
)
628 /* Handle cases where function splitting code decides
629 to put function entry point into unlikely executed section
630 despite the fact that the function itself is not cold
631 (i.e. it is called rarely but contains a hot loop that is
632 better to live in hot subsection for the code locality). */
633 return function_section_1 (decl
,
634 first_function_block_is_cold
);
637 /* Return the section for the current function, take IN_COLD_SECTION_P
641 current_function_section (void)
643 return function_section_1 (current_function_decl
, in_cold_section_p
);
646 /* Tell assembler to switch to unlikely-to-be-executed text section. */
649 unlikely_text_section (void)
651 return function_section_1 (current_function_decl
, true);
654 /* When called within a function context, return true if the function
655 has been assigned a cold text section and if SECT is that section.
656 When called outside a function context, return true if SECT is the
657 default cold section. */
660 unlikely_text_section_p (section
*sect
)
662 return sect
== function_section_1 (current_function_decl
, true);
665 /* Return the read-only data section associated with function DECL. */
668 default_function_rodata_section (tree decl
)
670 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
672 const char *name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
674 if (DECL_ONE_ONLY (decl
) && HAVE_COMDAT_GROUP
)
680 dot
= strchr (name
+ 1, '.');
683 len
= strlen (dot
) + 8;
684 rname
= (char *) alloca (len
);
686 strcpy (rname
, ".rodata");
688 return get_section (rname
, SECTION_LINKONCE
, decl
);
690 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
691 else if (DECL_ONE_ONLY (decl
)
692 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
694 size_t len
= strlen (name
) + 1;
695 char *rname
= (char *) alloca (len
);
697 memcpy (rname
, name
, len
);
699 return get_section (rname
, SECTION_LINKONCE
, decl
);
701 /* For .text.foo we want to use .rodata.foo. */
702 else if (flag_function_sections
&& flag_data_sections
703 && strncmp (name
, ".text.", 6) == 0)
705 size_t len
= strlen (name
) + 1;
706 char *rname
= (char *) alloca (len
+ 2);
708 memcpy (rname
, ".rodata", 7);
709 memcpy (rname
+ 7, name
+ 5, len
- 5);
710 return get_section (rname
, 0, decl
);
714 return readonly_data_section
;
717 /* Return the read-only data section associated with function DECL
718 for targets where that section should be always the single
719 readonly data section. */
722 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
724 return readonly_data_section
;
727 /* Return the section to use for string merging. */
730 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
731 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
732 unsigned int flags ATTRIBUTE_UNUSED
)
736 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
737 && TREE_CODE (decl
) == STRING_CST
738 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
740 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
741 && TREE_STRING_LENGTH (decl
) >= len
)
743 enum machine_mode mode
;
744 unsigned int modesize
;
748 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
749 char *name
= (char *) alloca (strlen (prefix
) + 30);
751 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
752 modesize
= GET_MODE_BITSIZE (mode
);
753 if (modesize
>= 8 && modesize
<= 256
754 && (modesize
& (modesize
- 1)) == 0)
756 if (align
< modesize
)
759 str
= TREE_STRING_POINTER (decl
);
760 unit
= GET_MODE_SIZE (mode
);
762 /* Check for embedded NUL characters. */
763 for (i
= 0; i
< len
; i
+= unit
)
765 for (j
= 0; j
< unit
; j
++)
766 if (str
[i
+ j
] != '\0')
773 sprintf (name
, "%s.str%d.%d", prefix
,
774 modesize
/ 8, (int) (align
/ 8));
775 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
776 return get_section (name
, flags
, NULL
);
781 return readonly_data_section
;
784 /* Return the section to use for constant merging. */
787 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
788 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
789 unsigned int flags ATTRIBUTE_UNUSED
)
791 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
793 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
799 && (align
& (align
- 1)) == 0)
801 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
802 char *name
= (char *) alloca (strlen (prefix
) + 30);
804 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
805 flags
|= (align
/ 8) | SECTION_MERGE
;
806 return get_section (name
, flags
, NULL
);
808 return readonly_data_section
;
811 /* Given NAME, a putative register name, discard any customary prefixes. */
814 strip_reg_name (const char *name
)
816 #ifdef REGISTER_PREFIX
817 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
818 name
+= strlen (REGISTER_PREFIX
);
820 if (name
[0] == '%' || name
[0] == '#')
825 /* The user has asked for a DECL to have a particular name. Set (or
826 change) it in such a way that we don't prefix an underscore to
829 set_user_assembler_name (tree decl
, const char *name
)
831 char *starred
= (char *) alloca (strlen (name
) + 2);
833 strcpy (starred
+ 1, name
);
834 change_decl_assembler_name (decl
, get_identifier (starred
));
835 SET_DECL_RTL (decl
, NULL_RTX
);
838 /* Decode an `asm' spec for a declaration as a register name.
839 Return the register number, or -1 if nothing specified,
840 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
841 or -3 if ASMSPEC is `cc' and is not recognized,
842 or -4 if ASMSPEC is `memory' and is not recognized.
843 Accept an exact spelling or a decimal number.
844 Prefixes such as % are optional. */
847 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
849 /* Presume just one register is clobbered. */
856 /* Get rid of confusing prefixes. */
857 asmspec
= strip_reg_name (asmspec
);
859 /* Allow a decimal number as a "register name". */
860 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
861 if (! ISDIGIT (asmspec
[i
]))
863 if (asmspec
[0] != 0 && i
< 0)
866 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0)
872 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
874 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
877 #ifdef OVERLAPPING_REGISTER_NAMES
881 const char *const name
;
884 } table
[] = OVERLAPPING_REGISTER_NAMES
;
886 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
888 && ! strcmp (asmspec
, table
[i
].name
))
890 *pnregs
= table
[i
].nregs
;
891 return table
[i
].number
;
894 #endif /* OVERLAPPING_REGISTER_NAMES */
896 #ifdef ADDITIONAL_REGISTER_NAMES
898 static const struct { const char *const name
; const int number
; } table
[]
899 = ADDITIONAL_REGISTER_NAMES
;
901 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
903 && ! strcmp (asmspec
, table
[i
].name
))
904 return table
[i
].number
;
906 #endif /* ADDITIONAL_REGISTER_NAMES */
908 if (!strcmp (asmspec
, "memory"))
911 if (!strcmp (asmspec
, "cc"))
921 decode_reg_name (const char *name
)
924 return decode_reg_name_and_count (name
, &count
);
928 /* Return true if DECL's initializer is suitable for a BSS section. */
931 bss_initializer_p (const_tree decl
)
933 return (DECL_INITIAL (decl
) == NULL
934 || DECL_INITIAL (decl
) == error_mark_node
935 || (flag_zero_initialized_in_bss
936 /* Leave constant zeroes in .rodata so they
938 && !TREE_READONLY (decl
)
939 && initializer_zerop (DECL_INITIAL (decl
))));
942 /* Compute the alignment of variable specified by DECL.
943 DONT_OUTPUT_DATA is from assemble_variable. */
946 align_variable (tree decl
, bool dont_output_data
)
948 unsigned int align
= DECL_ALIGN (decl
);
950 /* In the case for initialing an array whose length isn't specified,
951 where we have not yet been able to do the layout,
952 figure out the proper alignment now. */
953 if (dont_output_data
&& DECL_SIZE (decl
) == 0
954 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
955 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
957 /* Some object file formats have a maximum alignment which they support.
958 In particular, a.out format supports a maximum alignment of 4. */
959 if (align
> MAX_OFILE_ALIGNMENT
)
961 warning (0, "alignment of %q+D is greater than maximum object "
962 "file alignment. Using %d", decl
,
963 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
964 align
= MAX_OFILE_ALIGNMENT
;
967 /* On some machines, it is good to increase alignment sometimes. */
968 if (! DECL_USER_ALIGN (decl
))
970 #ifdef DATA_ALIGNMENT
971 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
972 /* Don't increase alignment too much for TLS variables - TLS space
974 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
977 #ifdef CONSTANT_ALIGNMENT
978 if (DECL_INITIAL (decl
) != 0 && DECL_INITIAL (decl
) != error_mark_node
)
980 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
982 /* Don't increase alignment too much for TLS variables - TLS space
984 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
990 /* Reset the alignment in case we have made it tighter, so we can benefit
991 from it in get_pointer_alignment. */
992 DECL_ALIGN (decl
) = align
;
995 /* Return the section into which the given VAR_DECL or CONST_DECL
996 should be placed. PREFER_NOSWITCH_P is true if a noswitch
997 section should be used wherever possible. */
1000 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1002 addr_space_t as
= ADDR_SPACE_GENERIC
;
1005 if (TREE_TYPE (decl
) != error_mark_node
)
1006 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1008 if (DECL_COMMON (decl
))
1010 /* If the decl has been given an explicit section name, or it resides
1011 in a non-generic address space, then it isn't common, and shouldn't
1012 be handled as such. */
1013 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1014 && ADDR_SPACE_GENERIC_P (as
));
1015 if (DECL_THREAD_LOCAL_P (decl
))
1016 return tls_comm_section
;
1017 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1018 return comm_section
;
1021 if (DECL_INITIAL (decl
) == error_mark_node
)
1022 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1023 else if (DECL_INITIAL (decl
))
1024 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1028 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1029 if (IN_NAMED_SECTION (decl
))
1030 return get_named_section (decl
, NULL
, reloc
);
1032 if (ADDR_SPACE_GENERIC_P (as
)
1033 && !DECL_THREAD_LOCAL_P (decl
)
1034 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1035 && bss_initializer_p (decl
))
1037 if (!TREE_PUBLIC (decl
))
1038 return lcomm_section
;
1039 if (bss_noswitch_section
)
1040 return bss_noswitch_section
;
1043 return targetm
.asm_out
.select_section (decl
, reloc
, DECL_ALIGN (decl
));
1046 /* Return the block into which object_block DECL should be placed. */
1048 static struct object_block
*
1049 get_block_for_decl (tree decl
)
1053 if (TREE_CODE (decl
) == VAR_DECL
)
1055 /* The object must be defined in this translation unit. */
1056 if (DECL_EXTERNAL (decl
))
1059 /* There's no point using object blocks for something that is
1060 isolated by definition. */
1061 if (DECL_ONE_ONLY (decl
))
1065 /* We can only calculate block offsets if the decl has a known
1067 if (DECL_SIZE_UNIT (decl
) == NULL
)
1069 if (!host_integerp (DECL_SIZE_UNIT (decl
), 1))
1072 /* Find out which section should contain DECL. We cannot put it into
1073 an object block if it requires a standalone definition. */
1074 if (TREE_CODE (decl
) == VAR_DECL
)
1075 align_variable (decl
, 0);
1076 sect
= get_variable_section (decl
, true);
1077 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1080 return get_block_for_section (sect
);
1083 /* Make sure block symbol SYMBOL is in block BLOCK. */
1086 change_symbol_block (rtx symbol
, struct object_block
*block
)
1088 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1090 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1091 SYMBOL_REF_BLOCK (symbol
) = block
;
1095 /* Return true if it is possible to put DECL in an object_block. */
1098 use_blocks_for_decl_p (tree decl
)
1100 /* Only data DECLs can be placed into object blocks. */
1101 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1104 /* Detect decls created by dw2_force_const_mem. Such decls are
1105 special because DECL_INITIAL doesn't specify the decl's true value.
1106 dw2_output_indirect_constants will instead call assemble_variable
1107 with dont_output_data set to 1 and then print the contents itself. */
1108 if (DECL_INITIAL (decl
) == decl
)
1111 /* If this decl is an alias, then we don't want to emit a
1113 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)))
1116 return targetm
.use_blocks_for_decl_p (decl
);
1119 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1120 have static storage duration. In other words, it should not be an
1121 automatic variable, including PARM_DECLs.
1123 There is, however, one exception: this function handles variables
1124 explicitly placed in a particular register by the user.
1126 This is never called for PARM_DECL nodes. */
1129 make_decl_rtl (tree decl
)
1131 const char *name
= 0;
1135 /* Check that we are not being given an automatic variable. */
1136 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1137 && TREE_CODE (decl
) != RESULT_DECL
);
1139 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1140 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1141 || TREE_STATIC (decl
)
1142 || TREE_PUBLIC (decl
)
1143 || DECL_EXTERNAL (decl
)
1144 || DECL_REGISTER (decl
));
1146 /* And that we were not given a type or a label. */
1147 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1148 && TREE_CODE (decl
) != LABEL_DECL
);
1150 /* For a duplicate declaration, we can be called twice on the
1151 same DECL node. Don't discard the RTL already made. */
1152 if (DECL_RTL_SET_P (decl
))
1154 /* If the old RTL had the wrong mode, fix the mode. */
1155 x
= DECL_RTL (decl
);
1156 if (GET_MODE (x
) != DECL_MODE (decl
))
1157 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1159 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1162 /* ??? Another way to do this would be to maintain a hashed
1163 table of such critters. Instead of adding stuff to a DECL
1164 to give certain attributes to it, we could use an external
1165 hash map from DECL to set of attributes. */
1167 /* Let the target reassign the RTL if it wants.
1168 This is necessary, for example, when one machine specific
1169 decl attribute overrides another. */
1170 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1172 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1173 on the new decl information. */
1175 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1176 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1177 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1179 /* Make this function static known to the mudflap runtime. */
1180 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1181 mudflap_enqueue_decl (decl
);
1186 /* If this variable belongs to the global constant pool, retrieve the
1187 pre-computed RTL or recompute it in LTO mode. */
1188 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_IN_CONSTANT_POOL (decl
))
1190 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1194 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
1196 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1197 && DECL_REGISTER (decl
))
1199 error ("register name not specified for %q+D", decl
);
1201 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1203 const char *asmspec
= name
+1;
1204 enum machine_mode mode
= DECL_MODE (decl
);
1205 reg_number
= decode_reg_name (asmspec
);
1206 /* First detect errors in declaring global registers. */
1207 if (reg_number
== -1)
1208 error ("register name not specified for %q+D", decl
);
1209 else if (reg_number
< 0)
1210 error ("invalid register name for %q+D", decl
);
1211 else if (mode
== BLKmode
)
1212 error ("data type of %q+D isn%'t suitable for a register",
1214 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1215 error ("the register specified for %q+D cannot be accessed"
1216 " by the current target", decl
);
1217 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1218 error ("the register specified for %q+D is not general enough"
1219 " to be used as a register variable", decl
);
1220 else if (!HARD_REGNO_MODE_OK (reg_number
, mode
))
1221 error ("register specified for %q+D isn%'t suitable for data type",
1223 /* Now handle properly declared static register variables. */
1228 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1230 DECL_INITIAL (decl
) = 0;
1231 error ("global register variable has initial value");
1233 if (TREE_THIS_VOLATILE (decl
))
1234 warning (OPT_Wvolatile_register_var
,
1235 "optimization may eliminate reads and/or "
1236 "writes to register variables");
1238 /* If the user specified one of the eliminables registers here,
1239 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1240 confused with that register and be eliminated. This usage is
1241 somewhat suspect... */
1243 SET_DECL_RTL (decl
, gen_rtx_raw_REG (mode
, reg_number
));
1244 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1245 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1247 if (TREE_STATIC (decl
))
1249 /* Make this register global, so not usable for anything
1251 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1252 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1253 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1255 nregs
= hard_regno_nregs
[reg_number
][mode
];
1257 globalize_reg (decl
, reg_number
+ --nregs
);
1260 /* As a register variable, it has no section. */
1264 /* Now handle ordinary static variables and functions (in memory).
1265 Also handle vars declared register invalidly. */
1266 else if (name
[0] == '*')
1268 #ifdef REGISTER_PREFIX
1269 if (strlen (REGISTER_PREFIX
) != 0)
1271 reg_number
= decode_reg_name (name
);
1272 if (reg_number
>= 0 || reg_number
== -3)
1273 error ("register name given for non-register variable %q+D", decl
);
1278 /* Specifying a section attribute on a variable forces it into a
1279 non-.bss section, and thus it cannot be common. */
1280 /* FIXME: In general this code should not be necessary because
1281 visibility pass is doing the same work. But notice_global_symbol
1282 is called early and it needs to make DECL_RTL to get the name.
1283 we take care of recomputing the DECL_RTL after visibility is changed. */
1284 if (TREE_CODE (decl
) == VAR_DECL
1285 && DECL_SECTION_NAME (decl
) != NULL_TREE
1286 && DECL_INITIAL (decl
) == NULL_TREE
1287 && DECL_COMMON (decl
))
1288 DECL_COMMON (decl
) = 0;
1290 /* Variables can't be both common and weak. */
1291 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1292 DECL_COMMON (decl
) = 0;
1294 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1295 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1298 enum machine_mode address_mode
= Pmode
;
1299 if (TREE_TYPE (decl
) != error_mark_node
)
1301 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1302 address_mode
= targetm
.addr_space
.address_mode (as
);
1304 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1306 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1307 SET_SYMBOL_REF_DECL (x
, decl
);
1309 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1310 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1311 set_mem_attributes (x
, decl
, 1);
1312 SET_DECL_RTL (decl
, x
);
1314 /* Optionally set flags or add text to the name to record information
1315 such as that it is a function name.
1316 If the name is changed, the macro ASM_OUTPUT_LABELREF
1317 will have to know how to strip this information. */
1318 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1320 /* Make this function static known to the mudflap runtime. */
1321 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1322 mudflap_enqueue_decl (decl
);
1325 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1326 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1330 make_decl_rtl_for_debug (tree decl
)
1332 unsigned int save_aliasing_flag
, save_mudflap_flag
;
1335 if (DECL_RTL_SET_P (decl
))
1336 return DECL_RTL (decl
);
1338 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1339 call new_alias_set. If running with -fcompare-debug, sometimes
1340 we do not want to create alias sets that will throw the alias
1341 numbers off in the comparison dumps. So... clearing
1342 flag_strict_aliasing will keep new_alias_set() from creating a
1343 new set. It is undesirable to register decl with mudflap
1344 in this case as well. */
1345 save_aliasing_flag
= flag_strict_aliasing
;
1346 flag_strict_aliasing
= 0;
1347 save_mudflap_flag
= flag_mudflap
;
1350 rtl
= DECL_RTL (decl
);
1351 /* Reset DECL_RTL back, as various parts of the compiler expects
1352 DECL_RTL set meaning it is actually going to be output. */
1353 SET_DECL_RTL (decl
, NULL
);
1355 flag_strict_aliasing
= save_aliasing_flag
;
1356 flag_mudflap
= save_mudflap_flag
;
1361 /* Output a string of literal assembler code
1362 for an `asm' keyword used between functions. */
1365 assemble_asm (tree string
)
1370 if (TREE_CODE (string
) == ADDR_EXPR
)
1371 string
= TREE_OPERAND (string
, 0);
1373 p
= TREE_STRING_POINTER (string
);
1374 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1377 /* Write the address of the entity given by SYMBOL to SEC. */
1379 assemble_addr_to_section (rtx symbol
, section
*sec
)
1381 switch_to_section (sec
);
1382 assemble_align (POINTER_SIZE
);
1383 assemble_integer (symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1386 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1387 not) section for PRIORITY. */
1389 get_cdtor_priority_section (int priority
, bool constructor_p
)
1393 /* ??? This only works reliably with the GNU linker. */
1394 sprintf (buf
, "%s.%.5u",
1395 constructor_p
? ".ctors" : ".dtors",
1396 /* Invert the numbering so the linker puts us in the proper
1397 order; constructors are run from right to left, and the
1398 linker sorts in increasing order. */
1399 MAX_INIT_PRIORITY
- priority
);
1400 return get_section (buf
, SECTION_WRITE
, NULL
);
1404 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1408 if (priority
!= DEFAULT_INIT_PRIORITY
)
1409 sec
= get_cdtor_priority_section (priority
,
1410 /*constructor_p=*/false);
1412 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1414 assemble_addr_to_section (symbol
, sec
);
1417 #ifdef DTORS_SECTION_ASM_OP
1419 default_dtor_section_asm_out_destructor (rtx symbol
,
1420 int priority ATTRIBUTE_UNUSED
)
1422 assemble_addr_to_section (symbol
, dtors_section
);
1427 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1431 if (priority
!= DEFAULT_INIT_PRIORITY
)
1432 sec
= get_cdtor_priority_section (priority
,
1433 /*constructor_p=*/true);
1435 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1437 assemble_addr_to_section (symbol
, sec
);
1440 #ifdef CTORS_SECTION_ASM_OP
1442 default_ctor_section_asm_out_constructor (rtx symbol
,
1443 int priority ATTRIBUTE_UNUSED
)
1445 assemble_addr_to_section (symbol
, ctors_section
);
1449 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1450 a nonzero value if the constant pool should be output before the
1451 start of the function, or a zero value if the pool should output
1452 after the end of the function. The default is to put it before the
1455 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1456 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1459 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1460 to be output to assembler.
1461 Set first_global_object_name and weak_global_object_name as appropriate. */
1464 notice_global_symbol (tree decl
)
1466 const char **type
= &first_global_object_name
;
1468 if (first_global_object_name
1469 || !TREE_PUBLIC (decl
)
1470 || DECL_EXTERNAL (decl
)
1471 || !DECL_NAME (decl
)
1472 || (TREE_CODE (decl
) != FUNCTION_DECL
1473 && (TREE_CODE (decl
) != VAR_DECL
1474 || (DECL_COMMON (decl
)
1475 && (DECL_INITIAL (decl
) == 0
1476 || DECL_INITIAL (decl
) == error_mark_node
))))
1477 || !MEM_P (DECL_RTL (decl
)))
1480 /* We win when global object is found, but it is useful to know about weak
1481 symbol as well so we can produce nicer unique names. */
1482 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1483 type
= &weak_global_object_name
;
1489 rtx decl_rtl
= DECL_RTL (decl
);
1491 p
= targetm
.strip_name_encoding (XSTR (XEXP (decl_rtl
, 0), 0));
1492 name
= ggc_strdup (p
);
1498 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1499 current function goes into the cold section, so that targets can use
1500 current_function_section during RTL expansion. DECL describes the
1504 decide_function_section (tree decl
)
1506 first_function_block_is_cold
= false;
1508 if (flag_reorder_blocks_and_partition
)
1509 /* We will decide in assemble_start_function. */
1512 if (DECL_SECTION_NAME (decl
))
1514 struct cgraph_node
*node
= cgraph_get_node (current_function_decl
);
1515 /* Calls to function_section rely on first_function_block_is_cold
1517 first_function_block_is_cold
= (node
1519 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1522 in_cold_section_p
= first_function_block_is_cold
;
1525 /* Output assembler code for the constant pool of a function and associated
1526 with defining the name of the function. DECL describes the function.
1527 NAME is the function's name. For the constant pool, we use the current
1528 constant pool data. */
1531 assemble_start_function (tree decl
, const char *fnname
)
1534 char tmp_label
[100];
1535 bool hot_label_written
= false;
1537 if (flag_reorder_blocks_and_partition
)
1539 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1540 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1541 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1542 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1543 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1544 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1545 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1546 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1551 crtl
->subsections
.hot_section_label
= NULL
;
1552 crtl
->subsections
.cold_section_label
= NULL
;
1553 crtl
->subsections
.hot_section_end_label
= NULL
;
1554 crtl
->subsections
.cold_section_end_label
= NULL
;
1557 /* The following code does not need preprocessing in the assembler. */
1561 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1562 output_constant_pool (fnname
, decl
);
1564 /* Make sure the not and cold text (code) sections are properly
1565 aligned. This is necessary here in the case where the function
1566 has both hot and cold sections, because we don't want to re-set
1567 the alignment when the section switch happens mid-function. */
1569 if (flag_reorder_blocks_and_partition
)
1571 first_function_block_is_cold
= false;
1573 switch_to_section (unlikely_text_section ());
1574 assemble_align (DECL_ALIGN (decl
));
1575 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1577 /* When the function starts with a cold section, we need to explicitly
1578 align the hot section and write out the hot section label.
1579 But if the current function is a thunk, we do not have a CFG. */
1581 && BB_PARTITION (ENTRY_BLOCK_PTR
->next_bb
) == BB_COLD_PARTITION
)
1583 switch_to_section (text_section
);
1584 assemble_align (DECL_ALIGN (decl
));
1585 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1586 hot_label_written
= true;
1587 first_function_block_is_cold
= true;
1589 in_cold_section_p
= first_function_block_is_cold
;
1593 /* Switch to the correct text section for the start of the function. */
1595 switch_to_section (function_section (decl
));
1596 if (flag_reorder_blocks_and_partition
1597 && !hot_label_written
)
1598 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1600 /* Tell assembler to move to target machine's alignment for functions. */
1601 align
= floor_log2 (DECL_ALIGN (decl
) / BITS_PER_UNIT
);
1604 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1607 /* Handle a user-specified function alignment.
1608 Note that we still need to align to DECL_ALIGN, as above,
1609 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1610 if (! DECL_USER_ALIGN (decl
)
1611 && align_functions_log
> align
1612 && optimize_function_for_speed_p (cfun
))
1614 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1615 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1616 align_functions_log
, align_functions
- 1);
1618 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1622 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1623 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1626 if (!DECL_IGNORED_P (decl
))
1627 (*debug_hooks
->begin_function
) (decl
);
1629 /* Make function name accessible from other files, if appropriate. */
1631 if (TREE_PUBLIC (decl
))
1633 notice_global_symbol (decl
);
1635 globalize_decl (decl
);
1637 maybe_assemble_visibility (decl
);
1640 if (DECL_PRESERVE_P (decl
))
1641 targetm
.asm_out
.mark_decl_preserved (fnname
);
1643 /* Do any machine/system dependent processing of the function name. */
1644 #ifdef ASM_DECLARE_FUNCTION_NAME
1645 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1647 /* Standard thing is just output label for the function. */
1648 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1649 #endif /* ASM_DECLARE_FUNCTION_NAME */
1651 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1652 saw_no_split_stack
= true;
1655 /* Output assembler code associated with defining the size of the
1656 function. DECL describes the function. NAME is the function's name. */
1659 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1661 #ifdef ASM_DECLARE_FUNCTION_SIZE
1662 /* We could have switched section in the middle of the function. */
1663 if (flag_reorder_blocks_and_partition
)
1664 switch_to_section (function_section (decl
));
1665 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1667 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1669 output_constant_pool (fnname
, decl
);
1670 switch_to_section (function_section (decl
)); /* need to switch back */
1672 /* Output labels for end of hot/cold text sections (to be used by
1674 if (flag_reorder_blocks_and_partition
)
1676 section
*save_text_section
;
1678 save_text_section
= in_section
;
1679 switch_to_section (unlikely_text_section ());
1680 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1681 if (first_function_block_is_cold
)
1682 switch_to_section (text_section
);
1684 switch_to_section (function_section (decl
));
1685 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1686 switch_to_section (save_text_section
);
1690 /* Assemble code to leave SIZE bytes of zeros. */
1693 assemble_zeros (unsigned HOST_WIDE_INT size
)
1695 /* Do no output if -fsyntax-only. */
1696 if (flag_syntax_only
)
1699 #ifdef ASM_NO_SKIP_IN_TEXT
1700 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1701 so we must output 0s explicitly in the text section. */
1702 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1704 unsigned HOST_WIDE_INT i
;
1705 for (i
= 0; i
< size
; i
++)
1706 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1711 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1714 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1717 assemble_align (int align
)
1719 if (align
> BITS_PER_UNIT
)
1721 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1725 /* Assemble a string constant with the specified C string as contents. */
1728 assemble_string (const char *p
, int size
)
1733 /* If the string is very long, split it up. */
1737 int thissize
= size
- pos
;
1738 if (thissize
> maximum
)
1741 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1749 /* A noswitch_section_callback for lcomm_section. */
1752 emit_local (tree decl ATTRIBUTE_UNUSED
,
1753 const char *name ATTRIBUTE_UNUSED
,
1754 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1755 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1757 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1758 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1759 size
, DECL_ALIGN (decl
));
1761 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1762 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1765 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1770 /* A noswitch_section_callback for bss_noswitch_section. */
1772 #if defined ASM_OUTPUT_ALIGNED_BSS
1774 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1775 const char *name ATTRIBUTE_UNUSED
,
1776 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1777 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1779 #if defined ASM_OUTPUT_ALIGNED_BSS
1780 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
, DECL_ALIGN (decl
));
1786 /* A noswitch_section_callback for comm_section. */
1789 emit_common (tree decl ATTRIBUTE_UNUSED
,
1790 const char *name ATTRIBUTE_UNUSED
,
1791 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1792 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1794 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1795 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1796 size
, DECL_ALIGN (decl
));
1798 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1799 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1802 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1807 /* A noswitch_section_callback for tls_comm_section. */
1810 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1811 const char *name ATTRIBUTE_UNUSED
,
1812 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1813 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1815 #ifdef ASM_OUTPUT_TLS_COMMON
1816 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
1819 sorry ("thread-local COMMON data not implemented");
1824 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1825 NAME is the name of DECL's SYMBOL_REF. */
1828 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
)
1830 unsigned HOST_WIDE_INT size
, rounded
;
1832 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
1835 if (flag_asan
&& asan_protect_global (decl
))
1836 size
+= asan_red_zone_size (size
);
1838 /* Don't allocate zero bytes of common,
1839 since that means "undefined external" in the linker. */
1843 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1844 so that each uninitialized object starts on such a boundary. */
1845 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
1846 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
1847 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
1849 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
1850 && (unsigned HOST_WIDE_INT
) DECL_ALIGN_UNIT (decl
) > rounded
)
1851 warning (0, "requested alignment for %q+D is greater than "
1852 "implemented alignment of %wu", decl
, rounded
);
1855 /* A subroutine of assemble_variable. Output the label and contents of
1856 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1857 is as for assemble_variable. */
1860 assemble_variable_contents (tree decl
, const char *name
,
1861 bool dont_output_data
)
1863 /* Do any machine/system dependent processing of the object. */
1864 #ifdef ASM_DECLARE_OBJECT_NAME
1865 last_assemble_variable_decl
= decl
;
1866 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
1868 /* Standard thing is just output label for the object. */
1869 ASM_OUTPUT_LABEL (asm_out_file
, name
);
1870 #endif /* ASM_DECLARE_OBJECT_NAME */
1872 if (!dont_output_data
)
1874 if (DECL_INITIAL (decl
)
1875 && DECL_INITIAL (decl
) != error_mark_node
1876 && !initializer_zerop (DECL_INITIAL (decl
)))
1877 /* Output the actual data. */
1878 output_constant (DECL_INITIAL (decl
),
1879 tree_low_cst (DECL_SIZE_UNIT (decl
), 1),
1882 /* Leave space for it. */
1883 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl
), 1));
1887 /* Assemble everything that is needed for a variable or function declaration.
1888 Not used for automatic variables, and not used for function definitions.
1889 Should not be called for variables of incomplete structure type.
1891 TOP_LEVEL is nonzero if this variable has file scope.
1892 AT_END is nonzero if this is the special handling, at end of compilation,
1893 to define things that have had only tentative definitions.
1894 DONT_OUTPUT_DATA if nonzero means don't actually output the
1895 initial value (that will be done by the caller). */
1898 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
1899 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
1902 rtx decl_rtl
, symbol
;
1904 bool asan_protected
= false;
1906 /* This function is supposed to handle VARIABLES. Ensure we have one. */
1907 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
1909 /* Emulated TLS had better not get this far. */
1910 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
1912 last_assemble_variable_decl
= 0;
1914 /* Normally no need to say anything here for external references,
1915 since assemble_external is called by the language-specific code
1916 when a declaration is first seen. */
1918 if (DECL_EXTERNAL (decl
))
1921 /* Do nothing for global register variables. */
1922 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
1924 TREE_ASM_WRITTEN (decl
) = 1;
1928 /* If type was incomplete when the variable was declared,
1929 see if it is complete now. */
1931 if (DECL_SIZE (decl
) == 0)
1932 layout_decl (decl
, 0);
1934 /* Still incomplete => don't allocate it; treat the tentative defn
1935 (which is what it must have been) as an `extern' reference. */
1937 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
1939 error ("storage size of %q+D isn%'t known", decl
);
1940 TREE_ASM_WRITTEN (decl
) = 1;
1944 /* The first declaration of a variable that comes through this function
1945 decides whether it is global (in C, has external linkage)
1946 or local (in C, has internal linkage). So do nothing more
1947 if this function has already run. */
1949 if (TREE_ASM_WRITTEN (decl
))
1952 /* Make sure targetm.encode_section_info is invoked before we set
1954 decl_rtl
= DECL_RTL (decl
);
1956 TREE_ASM_WRITTEN (decl
) = 1;
1958 /* Do no output if -fsyntax-only. */
1959 if (flag_syntax_only
)
1962 if (! dont_output_data
1963 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
1965 error ("size of variable %q+D is too large", decl
);
1969 gcc_assert (MEM_P (decl_rtl
));
1970 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
1971 symbol
= XEXP (decl_rtl
, 0);
1973 /* If this symbol belongs to the tree constant pool, output the constant
1974 if it hasn't already been written. */
1975 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
1977 tree decl
= SYMBOL_REF_DECL (symbol
);
1978 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
1979 output_constant_def_contents (symbol
);
1985 name
= XSTR (symbol
, 0);
1986 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
1987 notice_global_symbol (decl
);
1989 /* Compute the alignment of this data. */
1991 align_variable (decl
, dont_output_data
);
1994 && asan_protect_global (decl
))
1996 asan_protected
= true;
1997 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
1998 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
2001 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2003 if (TREE_PUBLIC (decl
))
2004 maybe_assemble_visibility (decl
);
2006 if (DECL_PRESERVE_P (decl
))
2007 targetm
.asm_out
.mark_decl_preserved (name
);
2009 /* First make the assembler name(s) global if appropriate. */
2010 sect
= get_variable_section (decl
, false);
2011 if (TREE_PUBLIC (decl
)
2012 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2013 globalize_decl (decl
);
2015 /* Output any data that we will need to use the address of. */
2016 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2017 output_addressed_constants (DECL_INITIAL (decl
));
2019 /* dbxout.c needs to know this. */
2020 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2021 DECL_IN_TEXT_SECTION (decl
) = 1;
2023 /* If the decl is part of an object_block, make sure that the decl
2024 has been positioned within its block, but do not write out its
2025 definition yet. output_object_blocks will do that later. */
2026 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2028 gcc_assert (!dont_output_data
);
2029 place_block_symbol (symbol
);
2031 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2032 assemble_noswitch_variable (decl
, name
, sect
);
2035 switch_to_section (sect
);
2036 if (DECL_ALIGN (decl
) > BITS_PER_UNIT
)
2037 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (DECL_ALIGN_UNIT (decl
)));
2038 assemble_variable_contents (decl
, name
, dont_output_data
);
2041 unsigned HOST_WIDE_INT
int size
2042 = tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
2043 assemble_zeros (asan_red_zone_size (size
));
2048 /* Return 1 if type TYPE contains any pointers. */
2051 contains_pointers_p (tree type
)
2053 switch (TREE_CODE (type
))
2056 case REFERENCE_TYPE
:
2057 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2058 so I'll play safe and return 1. */
2064 case QUAL_UNION_TYPE
:
2067 /* For a type that has fields, see if the fields have pointers. */
2068 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2069 if (TREE_CODE (fields
) == FIELD_DECL
2070 && contains_pointers_p (TREE_TYPE (fields
)))
2076 /* An array type contains pointers if its element type does. */
2077 return contains_pointers_p (TREE_TYPE (type
));
2084 /* We delay assemble_external processing until
2085 the compilation unit is finalized. This is the best we can do for
2086 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2087 it all the way to final. See PR 17982 for further discussion. */
2088 static GTY(()) tree pending_assemble_externals
;
2090 #ifdef ASM_OUTPUT_EXTERNAL
2091 /* True if DECL is a function decl for which no out-of-line copy exists.
2092 It is assumed that DECL's assembler name has been set. */
2095 incorporeal_function_p (tree decl
)
2097 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2101 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2102 && (DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
2103 || DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA_WITH_ALIGN
))
2106 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2107 /* Atomic or sync builtins which have survived this far will be
2108 resolved externally and therefore are not incorporeal. */
2109 if (strncmp (name
, "__builtin_", 10) == 0)
2115 /* Actually do the tests to determine if this is necessary, and invoke
2116 ASM_OUTPUT_EXTERNAL. */
2118 assemble_external_real (tree decl
)
2120 rtx rtl
= DECL_RTL (decl
);
2122 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2123 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2124 && !incorporeal_function_p (decl
))
2126 /* Some systems do require some output. */
2127 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2128 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2134 process_pending_assemble_externals (void)
2136 #ifdef ASM_OUTPUT_EXTERNAL
2138 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2139 assemble_external_real (TREE_VALUE (list
));
2141 pending_assemble_externals
= 0;
2145 /* This TREE_LIST contains any weak symbol declarations waiting
2147 static GTY(()) tree weak_decls
;
2149 /* Output something to declare an external symbol to the assembler,
2150 and qualifiers such as weakness. (Most assemblers don't need
2151 extern declaration, so we normally output nothing.) Do nothing if
2152 DECL is not external. */
2155 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2157 /* Make sure that the ASM_OUT_FILE is open.
2158 If it's not, we should not be calling this function. */
2159 gcc_assert (asm_out_file
);
2161 /* In a perfect world, the following condition would be true.
2162 Sadly, the Java and Go front ends emit assembly *from the front end*,
2163 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2165 /* This function should only be called if we are expanding, or have
2167 Ideally, only final.c would be calling this function, but it is
2168 not clear whether that would break things somehow. See PR 17982
2169 for further discussion. */
2170 gcc_assert (cgraph_state
== CGRAPH_STATE_EXPANSION
2171 || cgraph_state
== CGRAPH_STATE_FINISHED
);
2174 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2177 /* We want to output annotation for weak and external symbols at
2178 very last to check if they are references or not. */
2180 if (TARGET_SUPPORTS_WEAK
2182 /* TREE_STATIC is a weird and abused creature which is not
2183 generally the right test for whether an entity has been
2184 locally emitted, inlined or otherwise not-really-extern, but
2185 for declarations that can be weak, it happens to be
2187 && !TREE_STATIC (decl
)
2188 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2189 && value_member (decl
, weak_decls
) == NULL_TREE
)
2190 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2192 #ifdef ASM_OUTPUT_EXTERNAL
2193 if (value_member (decl
, pending_assemble_externals
) == NULL_TREE
)
2194 pending_assemble_externals
= tree_cons (NULL
, decl
,
2195 pending_assemble_externals
);
2199 /* Similar, for calling a library function FUN. */
2202 assemble_external_libcall (rtx fun
)
2204 /* Declare library function name external when first used, if nec. */
2205 if (! SYMBOL_REF_USED (fun
))
2207 SYMBOL_REF_USED (fun
) = 1;
2208 targetm
.asm_out
.external_libcall (fun
);
2212 /* Assemble a label named NAME. */
2215 assemble_label (FILE *file
, const char *name
)
2217 ASM_OUTPUT_LABEL (file
, name
);
2220 /* Set the symbol_referenced flag for ID. */
2222 mark_referenced (tree id
)
2224 TREE_SYMBOL_REFERENCED (id
) = 1;
2227 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2229 mark_decl_referenced (tree decl
)
2231 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2233 /* Extern inline functions don't become needed when referenced.
2234 If we know a method will be emitted in other TU and no new
2235 functions can be marked reachable, just use the external
2237 struct cgraph_node
*node
= cgraph_get_create_node (decl
);
2238 if (!DECL_EXTERNAL (decl
)
2239 && !node
->local
.finalized
)
2240 cgraph_mark_force_output_node (node
);
2242 else if (TREE_CODE (decl
) == VAR_DECL
)
2244 struct varpool_node
*node
= varpool_node_for_decl (decl
);
2245 /* C++ frontend use mark_decl_references to force COMDAT variables
2246 to be output that might appear dead otherwise. */
2247 node
->symbol
.force_output
= true;
2249 /* else do nothing - we can get various sorts of CST nodes here,
2250 which do not need to be marked. */
2254 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2255 until we find an identifier that is not itself a transparent alias.
2256 Modify the alias passed to it by reference (and all aliases on the
2257 way to the ultimate target), such that they do not have to be
2258 followed again, and return the ultimate target of the alias
2262 ultimate_transparent_alias_target (tree
*alias
)
2264 tree target
= *alias
;
2266 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
2268 gcc_assert (TREE_CHAIN (target
));
2269 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
2270 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
2271 && ! TREE_CHAIN (target
));
2278 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2279 starts with a *, the rest of NAME is output verbatim. Otherwise
2280 NAME is transformed in a target-specific way (usually by the
2281 addition of an underscore). */
2284 assemble_name_raw (FILE *file
, const char *name
)
2287 fputs (&name
[1], file
);
2289 ASM_OUTPUT_LABELREF (file
, name
);
2292 /* Like assemble_name_raw, but should be used when NAME might refer to
2293 an entity that is also represented as a tree (like a function or
2294 variable). If NAME does refer to such an entity, that entity will
2295 be marked as referenced. */
2298 assemble_name (FILE *file
, const char *name
)
2300 const char *real_name
;
2303 real_name
= targetm
.strip_name_encoding (name
);
2305 id
= maybe_get_identifier (real_name
);
2310 mark_referenced (id
);
2311 ultimate_transparent_alias_target (&id
);
2313 name
= IDENTIFIER_POINTER (id
);
2314 gcc_assert (! TREE_CHAIN (id
));
2317 assemble_name_raw (file
, name
);
2320 /* Allocate SIZE bytes writable static space with a gensym name
2321 and return an RTX to refer to its address. */
2324 assemble_static_space (unsigned HOST_WIDE_INT size
)
2327 const char *namestring
;
2330 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2332 namestring
= ggc_strdup (name
);
2334 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2335 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2337 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2338 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2341 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2342 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2345 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2346 so that each uninitialized object starts on such a boundary. */
2347 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2348 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2349 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2350 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2351 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2352 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2359 /* Assemble the static constant template for function entry trampolines.
2360 This is done at most once per compilation.
2361 Returns an RTX for the address of the template. */
2363 static GTY(()) rtx initial_trampoline
;
2366 assemble_trampoline_template (void)
2373 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2375 if (initial_trampoline
)
2376 return initial_trampoline
;
2378 /* By default, put trampoline templates in read-only data section. */
2380 #ifdef TRAMPOLINE_SECTION
2381 switch_to_section (TRAMPOLINE_SECTION
);
2383 switch_to_section (readonly_data_section
);
2386 /* Write the assembler code to define one. */
2387 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2389 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2391 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2392 targetm
.asm_out
.trampoline_template (asm_out_file
);
2394 /* Record the rtl to refer to it. */
2395 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2396 name
= ggc_strdup (label
);
2397 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2398 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2400 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2401 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2402 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2404 return initial_trampoline
;
2407 /* A and B are either alignments or offsets. Return the minimum alignment
2408 that may be assumed after adding the two together. */
2410 static inline unsigned
2411 min_align (unsigned int a
, unsigned int b
)
2413 return (a
| b
) & -(a
| b
);
2416 /* Return the assembler directive for creating a given kind of integer
2417 object. SIZE is the number of bytes in the object and ALIGNED_P
2418 indicates whether it is known to be aligned. Return NULL if the
2419 assembly dialect has no such directive.
2421 The returned string should be printed at the start of a new line and
2422 be followed immediately by the object's initial value. */
2425 integer_asm_op (int size
, int aligned_p
)
2427 struct asm_int_op
*ops
;
2430 ops
= &targetm
.asm_out
.aligned_op
;
2432 ops
= &targetm
.asm_out
.unaligned_op
;
2437 return targetm
.asm_out
.byte_op
;
2451 /* Use directive OP to assemble an integer object X. Print OP at the
2452 start of the line, followed immediately by the value of X. */
2455 assemble_integer_with_op (const char *op
, rtx x
)
2457 fputs (op
, asm_out_file
);
2458 output_addr_const (asm_out_file
, x
);
2459 fputc ('\n', asm_out_file
);
2462 /* The default implementation of the asm_out.integer target hook. */
2465 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2466 unsigned int size ATTRIBUTE_UNUSED
,
2467 int aligned_p ATTRIBUTE_UNUSED
)
2469 const char *op
= integer_asm_op (size
, aligned_p
);
2470 /* Avoid GAS bugs for large values. Specifically negative values whose
2471 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2472 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE
/ BITS_PER_UNIT
)
2474 return op
&& (assemble_integer_with_op (op
, x
), true);
2477 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2478 the alignment of the integer in bits. Return 1 if we were able to output
2479 the constant, otherwise 0. We must be able to output the constant,
2480 if FORCE is nonzero. */
2483 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2487 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2489 /* See if the target hook can handle this kind of object. */
2490 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2493 /* If the object is a multi-byte one, try splitting it up. Split
2494 it into words it if is multi-word, otherwise split it into bytes. */
2497 enum machine_mode omode
, imode
;
2498 unsigned int subalign
;
2499 unsigned int subsize
, i
;
2500 enum mode_class mclass
;
2502 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2503 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2504 if (GET_CODE (x
) == CONST_FIXED
)
2505 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2509 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2510 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2512 for (i
= 0; i
< size
; i
+= subsize
)
2514 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2515 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2521 /* If we've printed some of it, but not all of it, there's no going
2526 gcc_assert (!force
);
2532 assemble_real (REAL_VALUE_TYPE d
, enum machine_mode mode
, unsigned int align
)
2534 long data
[4] = {0, 0, 0, 0};
2536 int bitsize
, nelts
, nunits
, units_per
;
2538 /* This is hairy. We have a quantity of known size. real_to_target
2539 will put it into an array of *host* longs, 32 bits per element
2540 (even if long is more than 32 bits). We need to determine the
2541 number of array elements that are occupied (nelts) and the number
2542 of *target* min-addressable units that will be occupied in the
2543 object file (nunits). We cannot assume that 32 divides the
2544 mode's bitsize (size * BITS_PER_UNIT) evenly.
2546 size * BITS_PER_UNIT is used here to make sure that padding bits
2547 (which might appear at either end of the value; real_to_target
2548 will include the padding bits in its output array) are included. */
2550 nunits
= GET_MODE_SIZE (mode
);
2551 bitsize
= nunits
* BITS_PER_UNIT
;
2552 nelts
= CEIL (bitsize
, 32);
2553 units_per
= 32 / BITS_PER_UNIT
;
2555 real_to_target (data
, &d
, mode
);
2557 /* Put out the first word with the specified alignment. */
2558 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2559 nunits
-= units_per
;
2561 /* Subsequent words need only 32-bit alignment. */
2562 align
= min_align (align
, 32);
2564 for (i
= 1; i
< nelts
; i
++)
2566 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2567 nunits
-= units_per
;
2571 /* Given an expression EXP with a constant value,
2572 reduce it to the sum of an assembler symbol and an integer.
2573 Store them both in the structure *VALUE.
2574 EXP must be reducible. */
2578 HOST_WIDE_INT offset
;
2582 decode_addr_const (tree exp
, struct addr_const
*value
)
2584 tree target
= TREE_OPERAND (exp
, 0);
2590 if (TREE_CODE (target
) == COMPONENT_REF
2591 && host_integerp (byte_position (TREE_OPERAND (target
, 1)), 0))
2593 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2594 target
= TREE_OPERAND (target
, 0);
2596 else if (TREE_CODE (target
) == ARRAY_REF
2597 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2599 offset
+= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target
)), 1)
2600 * tree_low_cst (TREE_OPERAND (target
, 1), 0));
2601 target
= TREE_OPERAND (target
, 0);
2603 else if (TREE_CODE (target
) == MEM_REF
2604 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2606 offset
+= mem_ref_offset (target
).low
;
2607 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2609 else if (TREE_CODE (target
) == INDIRECT_REF
2610 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2611 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2613 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2618 switch (TREE_CODE (target
))
2622 x
= DECL_RTL (target
);
2626 x
= gen_rtx_MEM (FUNCTION_MODE
,
2627 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2636 x
= output_constant_def (target
, 1);
2643 gcc_assert (MEM_P (x
));
2647 value
->offset
= offset
;
2651 static GTY((param_is (struct constant_descriptor_tree
)))
2652 htab_t const_desc_htab
;
2654 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2656 /* Constant pool accessor function. */
2659 constant_pool_htab (void)
2661 return const_desc_htab
;
2664 /* Compute a hash code for a constant expression. */
2667 const_desc_hash (const void *ptr
)
2669 return ((const struct constant_descriptor_tree
*)ptr
)->hash
;
2673 const_hash_1 (const tree exp
)
2678 enum tree_code code
= TREE_CODE (exp
);
2680 /* Either set P and LEN to the address and len of something to hash and
2681 exit the switch or return a value. */
2686 p
= (char *) &TREE_INT_CST (exp
);
2687 len
= sizeof TREE_INT_CST (exp
);
2691 return real_hash (TREE_REAL_CST_PTR (exp
));
2694 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2697 p
= TREE_STRING_POINTER (exp
);
2698 len
= TREE_STRING_LENGTH (exp
);
2702 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2703 + const_hash_1 (TREE_IMAGPART (exp
)));
2709 hi
= 7 + VECTOR_CST_NELTS (exp
);
2711 for (i
= 0; i
< VECTOR_CST_NELTS (exp
); ++i
)
2712 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ELT (exp
, i
));
2719 unsigned HOST_WIDE_INT idx
;
2722 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2724 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2726 hi
= hi
* 603 + const_hash_1 (value
);
2734 struct addr_const value
;
2736 decode_addr_const (exp
, &value
);
2737 switch (GET_CODE (value
.base
))
2740 /* Don't hash the address of the SYMBOL_REF;
2741 only use the offset and the symbol name. */
2743 p
= XSTR (value
.base
, 0);
2744 for (i
= 0; p
[i
] != 0; i
++)
2745 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2749 hi
= value
.offset
+ CODE_LABEL_NUMBER (XEXP (value
.base
, 0)) * 13;
2759 case POINTER_PLUS_EXPR
:
2761 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2762 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2765 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2768 /* A language specific constant. Just hash the code. */
2772 /* Compute hashing function. */
2774 for (i
= 0; i
< len
; i
++)
2775 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2780 /* Wrapper of compare_constant, for the htab interface. */
2782 const_desc_eq (const void *p1
, const void *p2
)
2784 const struct constant_descriptor_tree
*const c1
2785 = (const struct constant_descriptor_tree
*) p1
;
2786 const struct constant_descriptor_tree
*const c2
2787 = (const struct constant_descriptor_tree
*) p2
;
2788 if (c1
->hash
!= c2
->hash
)
2790 return compare_constant (c1
->value
, c2
->value
);
2793 /* Compare t1 and t2, and return 1 only if they are known to result in
2794 the same bit pattern on output. */
2797 compare_constant (const tree t1
, const tree t2
)
2799 enum tree_code typecode
;
2801 if (t1
== NULL_TREE
)
2802 return t2
== NULL_TREE
;
2803 if (t2
== NULL_TREE
)
2806 if (TREE_CODE (t1
) != TREE_CODE (t2
))
2809 switch (TREE_CODE (t1
))
2812 /* Integer constants are the same only if the same width of type. */
2813 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2815 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2817 return tree_int_cst_equal (t1
, t2
);
2820 /* Real constants are the same only if the same width of type. */
2821 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2824 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
2827 /* Fixed constants are the same only if the same width of type. */
2828 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2831 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
2834 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2837 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
2838 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
2839 TREE_STRING_LENGTH (t1
)));
2842 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
2843 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
2849 if (VECTOR_CST_NELTS (t1
) != VECTOR_CST_NELTS (t2
))
2852 for (i
= 0; i
< VECTOR_CST_NELTS (t1
); ++i
)
2853 if (!compare_constant (VECTOR_CST_ELT (t1
, i
),
2854 VECTOR_CST_ELT (t2
, i
)))
2862 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
2863 unsigned HOST_WIDE_INT idx
;
2865 typecode
= TREE_CODE (TREE_TYPE (t1
));
2866 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
2869 if (typecode
== ARRAY_TYPE
)
2871 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
2872 /* For arrays, check that the sizes all match. */
2873 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
2875 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
2880 /* For record and union constructors, require exact type
2882 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
2886 v1
= CONSTRUCTOR_ELTS (t1
);
2887 v2
= CONSTRUCTOR_ELTS (t2
);
2888 if (vec_safe_length (v1
) != vec_safe_length (v2
))
2891 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
2893 constructor_elt
*c1
= &(*v1
)[idx
];
2894 constructor_elt
*c2
= &(*v2
)[idx
];
2896 /* Check that each value is the same... */
2897 if (!compare_constant (c1
->value
, c2
->value
))
2899 /* ... and that they apply to the same fields! */
2900 if (typecode
== ARRAY_TYPE
)
2902 if (!compare_constant (c1
->index
, c2
->index
))
2907 if (c1
->index
!= c2
->index
)
2918 struct addr_const value1
, value2
;
2922 decode_addr_const (t1
, &value1
);
2923 decode_addr_const (t2
, &value2
);
2925 if (value1
.offset
!= value2
.offset
)
2928 code
= GET_CODE (value1
.base
);
2929 if (code
!= GET_CODE (value2
.base
))
2935 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
2939 ret
= (CODE_LABEL_NUMBER (XEXP (value1
.base
, 0))
2940 == CODE_LABEL_NUMBER (XEXP (value2
.base
, 0)));
2950 case POINTER_PLUS_EXPR
:
2953 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
2954 && compare_constant(TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
2957 case VIEW_CONVERT_EXPR
:
2958 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
2967 /* Make a copy of the whole tree structure for a constant. This
2968 handles the same types of nodes that compare_constant handles. */
2971 copy_constant (tree exp
)
2973 switch (TREE_CODE (exp
))
2976 /* For ADDR_EXPR, we do not want to copy the decl whose address
2977 is requested. We do want to copy constants though. */
2978 if (CONSTANT_CLASS_P (TREE_OPERAND (exp
, 0)))
2979 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
2980 copy_constant (TREE_OPERAND (exp
, 0)));
2982 return copy_node (exp
);
2988 return copy_node (exp
);
2991 return build_complex (TREE_TYPE (exp
),
2992 copy_constant (TREE_REALPART (exp
)),
2993 copy_constant (TREE_IMAGPART (exp
)));
2996 case POINTER_PLUS_EXPR
:
2998 return build2 (TREE_CODE (exp
), TREE_TYPE (exp
),
2999 copy_constant (TREE_OPERAND (exp
, 0)),
3000 copy_constant (TREE_OPERAND (exp
, 1)));
3003 case VIEW_CONVERT_EXPR
:
3004 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3005 copy_constant (TREE_OPERAND (exp
, 0)));
3008 return build_vector (TREE_TYPE (exp
), VECTOR_CST_ELTS (exp
));
3012 tree copy
= copy_node (exp
);
3013 vec
<constructor_elt
, va_gc
> *v
;
3014 unsigned HOST_WIDE_INT idx
;
3015 tree purpose
, value
;
3017 vec_alloc (v
, vec_safe_length (CONSTRUCTOR_ELTS (exp
)));
3018 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp
), idx
, purpose
, value
)
3020 constructor_elt ce
= {purpose
, copy_constant (value
)};
3023 CONSTRUCTOR_ELTS (copy
) = v
;
3032 /* Return the section into which constant EXP should be placed. */
3035 get_constant_section (tree exp
, unsigned int align
)
3037 return targetm
.asm_out
.select_section (exp
,
3038 compute_reloc_for_constant (exp
),
3042 /* Return the size of constant EXP in bytes. */
3044 static HOST_WIDE_INT
3045 get_constant_size (tree exp
)
3049 size
= int_size_in_bytes (TREE_TYPE (exp
));
3050 if (TREE_CODE (exp
) == STRING_CST
)
3051 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3055 /* Subroutine of output_constant_def:
3056 No constant equal to EXP is known to have been output.
3057 Make a constant descriptor to enter EXP in the hash table.
3058 Assign the label number and construct RTL to refer to the
3059 constant's location in memory.
3060 Caller is responsible for updating the hash table. */
3062 static struct constant_descriptor_tree
*
3063 build_constant_desc (tree exp
)
3065 struct constant_descriptor_tree
*desc
;
3071 desc
= ggc_alloc_constant_descriptor_tree ();
3072 desc
->value
= copy_constant (exp
);
3074 /* Propagate marked-ness to copied constant. */
3075 if (flag_mudflap
&& mf_marked_p (exp
))
3076 mf_mark (desc
->value
);
3078 /* Create a string containing the label name, in LABEL. */
3079 labelno
= const_labelno
++;
3080 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3082 /* Construct the VAR_DECL associated with the constant. */
3083 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3085 DECL_ARTIFICIAL (decl
) = 1;
3086 DECL_IGNORED_P (decl
) = 1;
3087 TREE_READONLY (decl
) = 1;
3088 TREE_STATIC (decl
) = 1;
3089 TREE_ADDRESSABLE (decl
) = 1;
3090 /* We don't set the RTL yet as this would cause varpool to assume that the
3091 variable is referenced. Moreover, it would just be dropped in LTO mode.
3092 Instead we set the flag that will be recognized in make_decl_rtl. */
3093 DECL_IN_CONSTANT_POOL (decl
) = 1;
3094 DECL_INITIAL (decl
) = desc
->value
;
3095 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3096 architectures so use DATA_ALIGNMENT as well, except for strings. */
3097 if (TREE_CODE (exp
) == STRING_CST
)
3099 #ifdef CONSTANT_ALIGNMENT
3100 DECL_ALIGN (decl
) = CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
));
3104 align_variable (decl
, 0);
3106 /* Now construct the SYMBOL_REF and the MEM. */
3107 if (use_object_blocks_p ())
3109 section
*sect
= get_constant_section (exp
, DECL_ALIGN (decl
));
3110 symbol
= create_block_symbol (ggc_strdup (label
),
3111 get_block_for_section (sect
), -1);
3114 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3115 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3116 SET_SYMBOL_REF_DECL (symbol
, decl
);
3117 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3119 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3120 set_mem_attributes (rtl
, exp
, 1);
3121 set_mem_alias_set (rtl
, 0);
3122 set_mem_alias_set (rtl
, const_alias_set
);
3124 /* We cannot share RTX'es in pool entries.
3125 Mark this piece of RTL as required for unsharing. */
3126 RTX_FLAG (rtl
, used
) = 1;
3128 /* Set flags or add text to the name to record information, such as
3129 that it is a local symbol. If the name is changed, the macro
3130 ASM_OUTPUT_LABELREF will have to know how to strip this
3131 information. This call might invalidate our local variable
3132 SYMBOL; we can't use it afterward. */
3133 targetm
.encode_section_info (exp
, rtl
, true);
3140 /* Return an rtx representing a reference to constant data in memory
3141 for the constant expression EXP.
3143 If assembler code for such a constant has already been output,
3144 return an rtx to refer to it.
3145 Otherwise, output such a constant in memory
3146 and generate an rtx for it.
3148 If DEFER is nonzero, this constant can be deferred and output only
3149 if referenced in the function after all optimizations.
3151 `const_desc_table' records which constants already have label strings. */
3154 output_constant_def (tree exp
, int defer
)
3156 struct constant_descriptor_tree
*desc
;
3157 struct constant_descriptor_tree key
;
3160 /* Look up EXP in the table of constant descriptors. If we didn't find
3161 it, create a new one. */
3163 key
.hash
= const_hash_1 (exp
);
3164 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3166 desc
= (struct constant_descriptor_tree
*) *loc
;
3169 desc
= build_constant_desc (exp
);
3170 desc
->hash
= key
.hash
;
3174 maybe_output_constant_def_contents (desc
, defer
);
3178 /* Subroutine of output_constant_def: Decide whether or not we need to
3179 output the constant DESC now, and if so, do it. */
3181 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3184 rtx symbol
= XEXP (desc
->rtl
, 0);
3185 tree exp
= desc
->value
;
3187 if (flag_syntax_only
)
3190 if (TREE_ASM_WRITTEN (exp
))
3191 /* Already output; don't do it again. */
3194 /* We can always defer constants as long as the context allows
3198 /* Increment n_deferred_constants if it exists. It needs to be at
3199 least as large as the number of constants actually referred to
3200 by the function. If it's too small we'll stop looking too early
3201 and fail to emit constants; if it's too large we'll only look
3202 through the entire function when we could have stopped earlier. */
3204 n_deferred_constants
++;
3208 output_constant_def_contents (symbol
);
3211 /* Subroutine of output_constant_def_contents. Output the definition
3212 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3213 constant's alignment in bits. */
3216 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3220 size
= get_constant_size (exp
);
3222 /* Do any machine/system dependent processing of the constant. */
3223 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3225 /* Output the value of EXP. */
3226 output_constant (exp
, size
, align
);
3229 /* We must output the constant data referred to by SYMBOL; do so. */
3232 output_constant_def_contents (rtx symbol
)
3234 tree decl
= SYMBOL_REF_DECL (symbol
);
3235 tree exp
= DECL_INITIAL (decl
);
3238 /* Make sure any other constants whose addresses appear in EXP
3239 are assigned label numbers. */
3240 output_addressed_constants (exp
);
3242 /* We are no longer deferring this constant. */
3243 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3245 /* If the constant is part of an object block, make sure that the
3246 decl has been positioned within its block, but do not write out
3247 its definition yet. output_object_blocks will do that later. */
3248 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3249 place_block_symbol (symbol
);
3252 align
= DECL_ALIGN (decl
);
3253 switch_to_section (get_constant_section (exp
, align
));
3254 if (align
> BITS_PER_UNIT
)
3255 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3256 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3259 mudflap_enqueue_constant (exp
);
3262 /* Look up EXP in the table of constant descriptors. Return the rtl
3263 if it has been emitted, else null. */
3266 lookup_constant_def (tree exp
)
3268 struct constant_descriptor_tree
*desc
;
3269 struct constant_descriptor_tree key
;
3272 key
.hash
= const_hash_1 (exp
);
3273 desc
= (struct constant_descriptor_tree
*)
3274 htab_find_with_hash (const_desc_htab
, &key
, key
.hash
);
3276 return (desc
? desc
->rtl
: NULL_RTX
);
3279 /* Return a tree representing a reference to constant data in memory
3280 for the constant expression EXP.
3282 This is the counterpart of output_constant_def at the Tree level. */
3285 tree_output_constant_def (tree exp
)
3287 struct constant_descriptor_tree
*desc
, key
;
3291 /* Look up EXP in the table of constant descriptors. If we didn't find
3292 it, create a new one. */
3294 key
.hash
= const_hash_1 (exp
);
3295 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3297 desc
= (struct constant_descriptor_tree
*) *loc
;
3300 desc
= build_constant_desc (exp
);
3301 desc
->hash
= key
.hash
;
3305 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3306 varpool_finalize_decl (decl
);
3310 /* Used in the hash tables to avoid outputting the same constant
3311 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3312 are output once per function, not once per file. */
3313 /* ??? Only a few targets need per-function constant pools. Most
3314 can use one per-file pool. Should add a targetm bit to tell the
3317 struct GTY(()) rtx_constant_pool
{
3318 /* Pointers to first and last constant in pool, as ordered by offset. */
3319 struct constant_descriptor_rtx
*first
;
3320 struct constant_descriptor_rtx
*last
;
3322 /* Hash facility for making memory-constants from constant rtl-expressions.
3323 It is used on RISC machines where immediate integer arguments and
3324 constant addresses are restricted so that such constants must be stored
3326 htab_t
GTY((param_is (struct constant_descriptor_rtx
))) const_rtx_htab
;
3328 /* Current offset in constant pool (does not include any
3329 machine-specific header). */
3330 HOST_WIDE_INT offset
;
3333 struct GTY((chain_next ("%h.next"))) constant_descriptor_rtx
{
3334 struct constant_descriptor_rtx
*next
;
3338 HOST_WIDE_INT offset
;
3340 enum machine_mode mode
;
3346 /* Hash and compare functions for const_rtx_htab. */
3349 const_desc_rtx_hash (const void *ptr
)
3351 const struct constant_descriptor_rtx
*const desc
3352 = (const struct constant_descriptor_rtx
*) ptr
;
3357 const_desc_rtx_eq (const void *a
, const void *b
)
3359 const struct constant_descriptor_rtx
*const x
3360 = (const struct constant_descriptor_rtx
*) a
;
3361 const struct constant_descriptor_rtx
*const y
3362 = (const struct constant_descriptor_rtx
*) b
;
3364 if (x
->mode
!= y
->mode
)
3366 return rtx_equal_p (x
->constant
, y
->constant
);
3369 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3372 const_rtx_hash_1 (rtx
*xp
, void *data
)
3374 unsigned HOST_WIDE_INT hwi
;
3375 enum machine_mode mode
;
3381 code
= GET_CODE (x
);
3382 mode
= GET_MODE (x
);
3383 h
= (hashval_t
) code
* 1048573 + mode
;
3391 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3392 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3395 h
^= (hashval_t
) hwi
;
3396 for (i
= 1; i
< n
; ++i
)
3399 h
^= (hashval_t
) hwi
;
3405 if (mode
== VOIDmode
)
3407 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3411 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3415 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3421 for (i
= XVECLEN (x
, 0); i
-- > 0; )
3422 h
= h
* 251 + const_rtx_hash_1 (&XVECEXP (x
, 0, i
), data
);
3427 h
^= htab_hash_string (XSTR (x
, 0));
3431 h
= h
* 251 + CODE_LABEL_NUMBER (XEXP (x
, 0));
3435 case UNSPEC_VOLATILE
:
3436 h
= h
* 251 + XINT (x
, 1);
3443 hp
= (hashval_t
*) data
;
3444 *hp
= *hp
* 509 + h
;
3448 /* Compute a hash value for X, which should be a constant. */
3451 const_rtx_hash (rtx x
)
3454 for_each_rtx (&x
, const_rtx_hash_1
, &h
);
3459 /* Create and return a new rtx constant pool. */
3461 static struct rtx_constant_pool
*
3462 create_constant_pool (void)
3464 struct rtx_constant_pool
*pool
;
3466 pool
= ggc_alloc_rtx_constant_pool ();
3467 pool
->const_rtx_htab
= htab_create_ggc (31, const_desc_rtx_hash
,
3468 const_desc_rtx_eq
, NULL
);
3475 /* Initialize constant pool hashing for a new function. */
3478 init_varasm_status (void)
3480 crtl
->varasm
.pool
= create_constant_pool ();
3481 crtl
->varasm
.deferred_constants
= 0;
3484 /* Given a MINUS expression, simplify it if both sides
3485 include the same symbol. */
3488 simplify_subtraction (rtx x
)
3490 rtx r
= simplify_rtx (x
);
3494 /* Given a constant rtx X, make (or find) a memory constant for its value
3495 and return a MEM rtx to refer to it in memory. */
3498 force_const_mem (enum machine_mode mode
, rtx x
)
3500 struct constant_descriptor_rtx
*desc
, tmp
;
3501 struct rtx_constant_pool
*pool
;
3508 /* If we're not allowed to drop X into the constant pool, don't. */
3509 if (targetm
.cannot_force_const_mem (mode
, x
))
3512 /* Record that this function has used a constant pool entry. */
3513 crtl
->uses_const_pool
= 1;
3515 /* Decide which pool to use. */
3516 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3517 ? shared_constant_pool
3518 : crtl
->varasm
.pool
);
3520 /* Lookup the value in the hashtable. */
3523 hash
= const_rtx_hash (x
);
3524 slot
= htab_find_slot_with_hash (pool
->const_rtx_htab
, &tmp
, hash
, INSERT
);
3525 desc
= (struct constant_descriptor_rtx
*) *slot
;
3527 /* If the constant was already present, return its memory. */
3529 return copy_rtx (desc
->mem
);
3531 /* Otherwise, create a new descriptor. */
3532 desc
= ggc_alloc_constant_descriptor_rtx ();
3535 /* Align the location counter as required by EXP's data type. */
3536 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3537 #ifdef CONSTANT_ALIGNMENT
3539 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3540 if (type
!= NULL_TREE
)
3541 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3545 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3546 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3549 desc
->constant
= copy_rtx (tmp
.constant
);
3550 desc
->offset
= pool
->offset
;
3553 desc
->align
= align
;
3554 desc
->labelno
= const_labelno
;
3557 pool
->offset
+= GET_MODE_SIZE (mode
);
3559 pool
->last
->next
= desc
;
3561 pool
->first
= pool
->last
= desc
;
3564 /* Create a string containing the label name, in LABEL. */
3565 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3568 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3569 the constants pool. */
3570 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3572 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3573 symbol
= create_block_symbol (ggc_strdup (label
),
3574 get_block_for_section (sect
), -1);
3577 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3579 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3580 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3581 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3583 /* Construct the MEM. */
3584 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3585 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3586 set_mem_align (def
, align
);
3588 /* If we're dropping a label to the constant pool, make sure we
3590 if (GET_CODE (x
) == LABEL_REF
)
3591 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3593 return copy_rtx (def
);
3596 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3599 get_pool_constant (rtx addr
)
3601 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3604 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3605 and whether it has been output or not. */
3608 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3610 struct constant_descriptor_rtx
*desc
;
3612 desc
= SYMBOL_REF_CONSTANT (addr
);
3613 *pmarked
= (desc
->mark
!= 0);
3614 return desc
->constant
;
3617 /* Similar, return the mode. */
3620 get_pool_mode (const_rtx addr
)
3622 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3625 /* Return the size of the constant pool. */
3628 get_pool_size (void)
3630 return crtl
->varasm
.pool
->offset
;
3633 /* Worker function for output_constant_pool_1. Emit assembly for X
3634 in MODE with known alignment ALIGN. */
3637 output_constant_pool_2 (enum machine_mode mode
, rtx x
, unsigned int align
)
3639 switch (GET_MODE_CLASS (mode
))
3642 case MODE_DECIMAL_FLOAT
:
3646 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3647 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3648 assemble_real (r
, mode
, align
);
3653 case MODE_PARTIAL_INT
:
3658 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3661 case MODE_VECTOR_FLOAT
:
3662 case MODE_VECTOR_INT
:
3663 case MODE_VECTOR_FRACT
:
3664 case MODE_VECTOR_UFRACT
:
3665 case MODE_VECTOR_ACCUM
:
3666 case MODE_VECTOR_UACCUM
:
3669 enum machine_mode submode
= GET_MODE_INNER (mode
);
3670 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3672 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3673 units
= CONST_VECTOR_NUNITS (x
);
3675 for (i
= 0; i
< units
; i
++)
3677 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3678 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3688 /* Worker function for output_constant_pool. Emit constant DESC,
3689 giving it ALIGN bits of alignment. */
3692 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3699 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3700 whose CODE_LABEL has been deleted. This can occur if a jump table
3701 is eliminated by optimization. If so, write a constant of zero
3702 instead. Note that this can also happen by turning the
3703 CODE_LABEL into a NOTE. */
3704 /* ??? This seems completely and utterly wrong. Certainly it's
3705 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3706 functioning even with INSN_DELETED_P and friends. */
3709 switch (GET_CODE (tmp
))
3712 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3713 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3715 tmp
= XEXP (XEXP (tmp
, 0), 0);
3719 tmp
= XEXP (tmp
, 0);
3720 gcc_assert (!INSN_DELETED_P (tmp
));
3721 gcc_assert (!NOTE_P (tmp
)
3722 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3729 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3730 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3731 align
, desc
->labelno
, done
);
3734 assemble_align (align
);
3736 /* Output the label. */
3737 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3739 /* Output the data. */
3740 output_constant_pool_2 (desc
->mode
, x
, align
);
3742 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3743 sections have proper size. */
3744 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3746 && (in_section
->common
.flags
& SECTION_MERGE
))
3747 assemble_align (align
);
3749 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3755 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3756 to as used. Emit referenced deferred strings. This function can
3757 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3760 mark_constant (rtx
*current_rtx
, void *data ATTRIBUTE_UNUSED
)
3762 rtx x
= *current_rtx
;
3764 if (x
== NULL_RTX
|| GET_CODE (x
) != SYMBOL_REF
)
3767 if (CONSTANT_POOL_ADDRESS_P (x
))
3769 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3770 if (desc
->mark
== 0)
3773 for_each_rtx (&desc
->constant
, mark_constant
, NULL
);
3776 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3778 tree decl
= SYMBOL_REF_DECL (x
);
3779 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
3781 n_deferred_constants
--;
3782 output_constant_def_contents (x
);
3789 /* Look through appropriate parts of INSN, marking all entries in the
3790 constant pool which are actually being used. Entries that are only
3791 referenced by other constants are also marked as used. Emit
3792 deferred strings that are used. */
3795 mark_constants (rtx insn
)
3800 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3801 insns, not any notes that may be attached. We don't want to mark
3802 a constant just because it happens to appear in a REG_EQUIV note. */
3803 if (GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3805 rtx seq
= PATTERN (insn
);
3806 int i
, n
= XVECLEN (seq
, 0);
3807 for (i
= 0; i
< n
; ++i
)
3809 rtx subinsn
= XVECEXP (seq
, 0, i
);
3810 if (INSN_P (subinsn
))
3811 for_each_rtx (&PATTERN (subinsn
), mark_constant
, NULL
);
3815 for_each_rtx (&PATTERN (insn
), mark_constant
, NULL
);
3818 /* Look through the instructions for this function, and mark all the
3819 entries in POOL which are actually being used. Emit deferred constants
3820 which have indeed been used. */
3823 mark_constant_pool (void)
3827 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
3830 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3831 mark_constants (insn
);
3834 /* Write all the constants in POOL. */
3837 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
3839 struct constant_descriptor_rtx
*desc
;
3841 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3844 /* If the constant is part of an object_block, make sure that
3845 the constant has been positioned within its block, but do not
3846 write out its definition yet. output_object_blocks will do
3848 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
3849 && SYMBOL_REF_BLOCK (desc
->sym
))
3850 place_block_symbol (desc
->sym
);
3853 switch_to_section (targetm
.asm_out
.select_rtx_section
3854 (desc
->mode
, desc
->constant
, desc
->align
));
3855 output_constant_pool_1 (desc
, desc
->align
);
3860 /* Mark all constants that are used in the current function, then write
3861 out the function's private constant pool. */
3864 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
3865 tree fndecl ATTRIBUTE_UNUSED
)
3867 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
3869 /* It is possible for gcc to call force_const_mem and then to later
3870 discard the instructions which refer to the constant. In such a
3871 case we do not need to output the constant. */
3872 mark_constant_pool ();
3874 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3875 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3878 output_constant_pool_contents (pool
);
3880 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3881 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3885 /* Write the contents of the shared constant pool. */
3888 output_shared_constant_pool (void)
3890 output_constant_pool_contents (shared_constant_pool
);
3893 /* Determine what kind of relocations EXP may need. */
3896 compute_reloc_for_constant (tree exp
)
3898 int reloc
= 0, reloc2
;
3901 switch (TREE_CODE (exp
))
3905 /* Go inside any operations that get_inner_reference can handle and see
3906 if what's inside is a constant: no need to do anything here for
3907 addresses of variables or functions. */
3908 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3909 tem
= TREE_OPERAND (tem
, 0))
3912 if (TREE_CODE (tem
) == MEM_REF
3913 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
3915 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
3919 if (TREE_PUBLIC (tem
))
3926 case POINTER_PLUS_EXPR
:
3927 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3928 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3932 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3933 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3934 /* The difference of two local labels is computable at link time. */
3935 if (reloc
== 1 && reloc2
== 1)
3942 case VIEW_CONVERT_EXPR
:
3943 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3948 unsigned HOST_WIDE_INT idx
;
3949 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
3951 reloc
|= compute_reloc_for_constant (tem
);
3961 /* Find all the constants whose addresses are referenced inside of EXP,
3962 and make sure assembler code with a label has been output for each one.
3963 Indicate whether an ADDR_EXPR has been encountered. */
3966 output_addressed_constants (tree exp
)
3970 switch (TREE_CODE (exp
))
3974 /* Go inside any operations that get_inner_reference can handle and see
3975 if what's inside is a constant: no need to do anything here for
3976 addresses of variables or functions. */
3977 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3978 tem
= TREE_OPERAND (tem
, 0))
3981 /* If we have an initialized CONST_DECL, retrieve the initializer. */
3982 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
3983 tem
= DECL_INITIAL (tem
);
3985 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
3986 output_constant_def (tem
, 0);
3988 if (TREE_CODE (tem
) == MEM_REF
)
3989 output_addressed_constants (TREE_OPERAND (tem
, 0));
3993 case POINTER_PLUS_EXPR
:
3995 output_addressed_constants (TREE_OPERAND (exp
, 1));
3999 case VIEW_CONVERT_EXPR
:
4000 output_addressed_constants (TREE_OPERAND (exp
, 0));
4005 unsigned HOST_WIDE_INT idx
;
4006 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4008 output_addressed_constants (tem
);
4017 /* Whether a constructor CTOR is a valid static constant initializer if all
4018 its elements are. This used to be internal to initializer_constant_valid_p
4019 and has been exposed to let other functions like categorize_ctor_elements
4020 evaluate the property while walking a constructor for other purposes. */
4023 constructor_static_from_elts_p (const_tree ctor
)
4025 return (TREE_CONSTANT (ctor
)
4026 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4027 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4028 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4031 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4034 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4035 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4036 which are valid when ENDTYPE is an integer of any size; in
4037 particular, this does not accept a pointer minus a constant. This
4038 returns null_pointer_node if the VALUE is an absolute constant
4039 which can be used to initialize a static variable. Otherwise it
4043 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4047 if (!INTEGRAL_TYPE_P (endtype
))
4050 op0
= TREE_OPERAND (value
, 0);
4051 op1
= TREE_OPERAND (value
, 1);
4053 /* Like STRIP_NOPS except allow the operand mode to widen. This
4054 works around a feature of fold that simplifies (int)(p1 - p2) to
4055 ((int)p1 - (int)p2) under the theory that the narrower operation
4058 while (CONVERT_EXPR_P (op0
)
4059 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4061 tree inner
= TREE_OPERAND (op0
, 0);
4062 if (inner
== error_mark_node
4063 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4064 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4065 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4070 while (CONVERT_EXPR_P (op1
)
4071 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4073 tree inner
= TREE_OPERAND (op1
, 0);
4074 if (inner
== error_mark_node
4075 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4076 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4077 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4082 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4086 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4087 cache
? cache
+ 2 : NULL
);
4088 /* Both initializers must be known. */
4092 && (op0
== null_pointer_node
4093 || TREE_CODE (value
) == MINUS_EXPR
))
4094 return null_pointer_node
;
4096 /* Support differences between labels. */
4097 if (TREE_CODE (op0
) == LABEL_DECL
4098 && TREE_CODE (op1
) == LABEL_DECL
)
4099 return null_pointer_node
;
4101 if (TREE_CODE (op0
) == STRING_CST
4102 && TREE_CODE (op1
) == STRING_CST
4103 && operand_equal_p (op0
, op1
, 1))
4104 return null_pointer_node
;
4110 /* Helper function of initializer_constant_valid_p.
4111 Return nonzero if VALUE is a valid constant-valued expression
4112 for use in initializing a static variable; one that can be an
4113 element of a "constant" initializer.
4115 Return null_pointer_node if the value is absolute;
4116 if it is relocatable, return the variable that determines the relocation.
4117 We assume that VALUE has been folded as much as possible;
4118 therefore, we do not need to check for such things as
4119 arithmetic-combinations of integers.
4121 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4124 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4128 switch (TREE_CODE (value
))
4131 if (constructor_static_from_elts_p (value
))
4133 unsigned HOST_WIDE_INT idx
;
4135 bool absolute
= true;
4137 if (cache
&& cache
[0] == value
)
4139 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4142 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4149 cache
[1] = NULL_TREE
;
4153 if (reloc
!= null_pointer_node
)
4156 /* For a non-absolute relocation, there is no single
4157 variable that can be "the variable that determines the
4162 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4164 return absolute
? null_pointer_node
: error_mark_node
;
4167 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4175 return null_pointer_node
;
4180 tree op0
= staticp (TREE_OPERAND (value
, 0));
4183 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4184 to be a constant, this is old-skool offsetof-like nonsense. */
4185 if (TREE_CODE (op0
) == INDIRECT_REF
4186 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4187 return null_pointer_node
;
4188 /* Taking the address of a nested function involves a trampoline,
4189 unless we don't need or want one. */
4190 if (TREE_CODE (op0
) == FUNCTION_DECL
4191 && DECL_STATIC_CHAIN (op0
)
4192 && !TREE_NO_TRAMPOLINE (value
))
4194 /* "&{...}" requires a temporary to hold the constructed
4196 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4202 case NON_LVALUE_EXPR
:
4203 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4206 case VIEW_CONVERT_EXPR
:
4208 tree src
= TREE_OPERAND (value
, 0);
4209 tree src_type
= TREE_TYPE (src
);
4210 tree dest_type
= TREE_TYPE (value
);
4212 /* Allow view-conversions from aggregate to non-aggregate type only
4213 if the bit pattern is fully preserved afterwards; otherwise, the
4214 RTL expander won't be able to apply a subsequent transformation
4215 to the underlying constructor. */
4216 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4218 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4219 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4224 /* Allow all other kinds of view-conversion. */
4225 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4230 tree src
= TREE_OPERAND (value
, 0);
4231 tree src_type
= TREE_TYPE (src
);
4232 tree dest_type
= TREE_TYPE (value
);
4234 /* Allow conversions between pointer types, floating-point
4235 types, and offset types. */
4236 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4237 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4238 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4239 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4240 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4242 /* Allow length-preserving conversions between integer types. */
4243 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4244 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4245 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4247 /* Allow conversions between other integer types only if
4249 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4251 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4252 if (inner
== null_pointer_node
)
4253 return null_pointer_node
;
4257 /* Allow (int) &foo provided int is as wide as a pointer. */
4258 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4259 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4260 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4262 /* Likewise conversions from int to pointers, but also allow
4263 conversions from 0. */
4264 if ((POINTER_TYPE_P (dest_type
)
4265 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4266 && INTEGRAL_TYPE_P (src_type
))
4268 if (TREE_CODE (src
) == INTEGER_CST
4269 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4270 return null_pointer_node
;
4271 if (integer_zerop (src
))
4272 return null_pointer_node
;
4273 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4274 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4277 /* Allow conversions to struct or union types if the value
4279 if (TREE_CODE (dest_type
) == RECORD_TYPE
4280 || TREE_CODE (dest_type
) == UNION_TYPE
)
4281 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4285 case POINTER_PLUS_EXPR
:
4287 /* Any valid floating-point constants will have been folded by now;
4288 with -frounding-math we hit this with addition of two constants. */
4289 if (TREE_CODE (endtype
) == REAL_TYPE
)
4291 if (cache
&& cache
[0] == value
)
4293 if (! INTEGRAL_TYPE_P (endtype
)
4294 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4296 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4298 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4301 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4302 endtype
, ncache
+ 2);
4303 /* If either term is absolute, use the other term's relocation. */
4304 if (valid0
== null_pointer_node
)
4306 else if (valid1
== null_pointer_node
)
4308 /* Support narrowing pointer differences. */
4310 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4314 /* Support narrowing pointer differences. */
4315 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4324 if (TREE_CODE (endtype
) == REAL_TYPE
)
4326 if (cache
&& cache
[0] == value
)
4328 if (! INTEGRAL_TYPE_P (endtype
)
4329 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4331 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4333 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4336 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4337 endtype
, ncache
+ 2);
4338 /* Win if second argument is absolute. */
4339 if (valid1
== null_pointer_node
)
4341 /* Win if both arguments have the same relocation.
4342 Then the value is absolute. */
4343 else if (valid0
== valid1
&& valid0
!= 0)
4344 ret
= null_pointer_node
;
4345 /* Since GCC guarantees that string constants are unique in the
4346 generated code, a subtraction between two copies of the same
4347 constant string is absolute. */
4348 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4349 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4350 && operand_equal_p (valid0
, valid1
, 1))
4351 ret
= null_pointer_node
;
4352 /* Support narrowing differences. */
4354 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4358 /* Support narrowing differences. */
4359 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4374 /* Return nonzero if VALUE is a valid constant-valued expression
4375 for use in initializing a static variable; one that can be an
4376 element of a "constant" initializer.
4378 Return null_pointer_node if the value is absolute;
4379 if it is relocatable, return the variable that determines the relocation.
4380 We assume that VALUE has been folded as much as possible;
4381 therefore, we do not need to check for such things as
4382 arithmetic-combinations of integers. */
4384 initializer_constant_valid_p (tree value
, tree endtype
)
4386 return initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4389 /* Return true if VALUE is a valid constant-valued expression
4390 for use in initializing a static bit-field; one that can be
4391 an element of a "constant" initializer. */
4394 initializer_constant_valid_for_bitfield_p (tree value
)
4396 /* For bitfields we support integer constants or possibly nested aggregates
4398 switch (TREE_CODE (value
))
4402 unsigned HOST_WIDE_INT idx
;
4405 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4406 if (!initializer_constant_valid_for_bitfield_p (elt
))
4415 case VIEW_CONVERT_EXPR
:
4416 case NON_LVALUE_EXPR
:
4418 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4427 /* output_constructor outer state of relevance in recursive calls, typically
4428 for nested aggregate bitfields. */
4431 unsigned int bit_offset
; /* current position in ... */
4432 int byte
; /* ... the outer byte buffer. */
4435 static unsigned HOST_WIDE_INT
4436 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int,
4439 /* Output assembler code for constant EXP to FILE, with no label.
4440 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4441 Assumes output_addressed_constants has been done on EXP already.
4443 Generate exactly SIZE bytes of assembler data, padding at the end
4444 with zeros if necessary. SIZE must always be specified.
4446 SIZE is important for structure constructors,
4447 since trailing members may have been omitted from the constructor.
4448 It is also important for initialization of arrays from string constants
4449 since the full length of the string constant might not be wanted.
4450 It is also needed for initialization of unions, where the initializer's
4451 type is just one member, and that may not be as long as the union.
4453 There a case in which we would fail to output exactly SIZE bytes:
4454 for a structure constructor that wants to produce more than SIZE bytes.
4455 But such constructors will never be generated for any possible input.
4457 ALIGN is the alignment of the data in bits. */
4460 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4462 enum tree_code code
;
4463 unsigned HOST_WIDE_INT thissize
;
4465 if (size
== 0 || flag_syntax_only
)
4468 /* See if we're trying to initialize a pointer in a non-default mode
4469 to the address of some declaration somewhere. If the target says
4470 the mode is valid for pointers, assume the target has a way of
4472 if (TREE_CODE (exp
) == NOP_EXPR
4473 && POINTER_TYPE_P (TREE_TYPE (exp
))
4474 && targetm
.addr_space
.valid_pointer_mode
4475 (TYPE_MODE (TREE_TYPE (exp
)),
4476 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4478 tree saved_type
= TREE_TYPE (exp
);
4480 /* Peel off any intermediate conversions-to-pointer for valid
4482 while (TREE_CODE (exp
) == NOP_EXPR
4483 && POINTER_TYPE_P (TREE_TYPE (exp
))
4484 && targetm
.addr_space
.valid_pointer_mode
4485 (TYPE_MODE (TREE_TYPE (exp
)),
4486 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4487 exp
= TREE_OPERAND (exp
, 0);
4489 /* If what we're left with is the address of something, we can
4490 convert the address to the final type and output it that
4492 if (TREE_CODE (exp
) == ADDR_EXPR
)
4493 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4494 /* Likewise for constant ints. */
4495 else if (TREE_CODE (exp
) == INTEGER_CST
)
4496 exp
= build_int_cst_wide (saved_type
, TREE_INT_CST_LOW (exp
),
4497 TREE_INT_CST_HIGH (exp
));
4501 /* Eliminate any conversions since we'll be outputting the underlying
4503 while (CONVERT_EXPR_P (exp
)
4504 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4505 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4507 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4508 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4510 /* Make sure eliminating the conversion is really a no-op, except with
4511 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4512 union types to allow for Ada unchecked unions. */
4513 if (type_size
> op_size
4514 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4515 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4516 /* Keep the conversion. */
4519 exp
= TREE_OPERAND (exp
, 0);
4522 code
= TREE_CODE (TREE_TYPE (exp
));
4523 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4525 /* Allow a constructor with no elements for any data type.
4526 This means to fill the space with zeros. */
4527 if (TREE_CODE (exp
) == CONSTRUCTOR
4528 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4530 assemble_zeros (size
);
4534 if (TREE_CODE (exp
) == FDESC_EXPR
)
4536 #ifdef ASM_OUTPUT_FDESC
4537 HOST_WIDE_INT part
= tree_low_cst (TREE_OPERAND (exp
, 1), 0);
4538 tree decl
= TREE_OPERAND (exp
, 0);
4539 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4546 /* Now output the underlying data. If we've handling the padding, return.
4547 Otherwise, break and ensure SIZE is the size written. */
4554 case REFERENCE_TYPE
:
4556 case FIXED_POINT_TYPE
:
4557 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4558 EXPAND_INITIALIZER
),
4559 MIN (size
, thissize
), align
, 0))
4560 error ("initializer for integer/fixed-point value is too complicated");
4564 if (TREE_CODE (exp
) != REAL_CST
)
4565 error ("initializer for floating value is not a floating constant");
4567 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4571 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4572 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4573 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4578 switch (TREE_CODE (exp
))
4581 output_constructor (exp
, size
, align
, NULL
);
4584 thissize
= MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
),
4586 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4592 unsigned int i
, nalign
;
4593 enum machine_mode inner
;
4595 inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4596 nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4598 elt_size
= GET_MODE_SIZE (inner
);
4600 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
);
4601 thissize
= elt_size
;
4602 for (i
= 1; i
< VECTOR_CST_NELTS (exp
); ++i
)
4604 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
);
4605 thissize
+= elt_size
;
4616 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4617 output_constructor (exp
, size
, align
, NULL
);
4627 if (size
> thissize
)
4628 assemble_zeros (size
- thissize
);
4632 /* Subroutine of output_constructor, used for computing the size of
4633 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4634 type with an unspecified upper bound. */
4636 static unsigned HOST_WIDE_INT
4637 array_size_for_constructor (tree val
)
4640 unsigned HOST_WIDE_INT cnt
;
4641 tree index
, value
, tmp
;
4644 /* This code used to attempt to handle string constants that are not
4645 arrays of single-bytes, but nothing else does, so there's no point in
4647 if (TREE_CODE (val
) == STRING_CST
)
4648 return TREE_STRING_LENGTH (val
);
4650 max_index
= NULL_TREE
;
4651 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4653 if (TREE_CODE (index
) == RANGE_EXPR
)
4654 index
= TREE_OPERAND (index
, 1);
4655 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4659 if (max_index
== NULL_TREE
)
4662 /* Compute the total number of array elements. */
4663 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4664 i
= tree_to_double_int (max_index
) - tree_to_double_int (tmp
);
4665 i
+= double_int_one
;
4667 /* Multiply by the array element unit size to find number of bytes. */
4668 i
*= tree_to_double_int (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4670 gcc_assert (i
.fits_uhwi ());
4674 /* Other datastructures + helpers for output_constructor. */
4676 /* output_constructor local state to support interaction with helpers. */
4680 /* Received arguments. */
4681 tree exp
; /* Constructor expression. */
4682 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4683 unsigned int align
; /* Known initial alignment. */
4685 /* Constructor expression data. */
4686 tree type
; /* Expression type. */
4687 tree field
; /* Current field decl in a record. */
4688 tree min_index
; /* Lower bound if specified for an array. */
4690 /* Output processing state. */
4691 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4692 bool byte_buffer_in_use
; /* Whether byte ... */
4693 int byte
; /* ... contains part of a bitfield byte yet to
4696 int last_relative_index
; /* Implicit or explicit index of the last
4697 array element output within a bitfield. */
4698 /* Current element. */
4699 tree val
; /* Current element value. */
4700 tree index
; /* Current element index. */
4704 /* Helper for output_constructor. From the current LOCAL state, output a
4705 RANGE_EXPR element. */
4708 output_constructor_array_range (oc_local_state
*local
)
4710 unsigned HOST_WIDE_INT fieldsize
4711 = int_size_in_bytes (TREE_TYPE (local
->type
));
4713 HOST_WIDE_INT lo_index
4714 = tree_low_cst (TREE_OPERAND (local
->index
, 0), 0);
4715 HOST_WIDE_INT hi_index
4716 = tree_low_cst (TREE_OPERAND (local
->index
, 1), 0);
4717 HOST_WIDE_INT index
;
4720 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4722 for (index
= lo_index
; index
<= hi_index
; index
++)
4724 /* Output the element's initial value. */
4725 if (local
->val
== NULL_TREE
)
4726 assemble_zeros (fieldsize
);
4728 output_constant (local
->val
, fieldsize
, align2
);
4730 /* Count its size. */
4731 local
->total_bytes
+= fieldsize
;
4735 /* Helper for output_constructor. From the current LOCAL state, output a
4736 field element that is not true bitfield or part of an outer one. */
4739 output_constructor_regular_field (oc_local_state
*local
)
4741 /* Field size and position. Since this structure is static, we know the
4742 positions are constant. */
4743 unsigned HOST_WIDE_INT fieldsize
;
4744 HOST_WIDE_INT fieldpos
;
4746 unsigned int align2
;
4748 if (local
->index
!= NULL_TREE
)
4750 /* Perform the index calculation in modulo arithmetic but
4751 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4752 but we are using an unsigned sizetype. */
4753 unsigned prec
= TYPE_PRECISION (sizetype
);
4754 double_int idx
= tree_to_double_int (local
->index
)
4755 - tree_to_double_int (local
->min_index
);
4756 idx
= idx
.sext (prec
);
4757 fieldpos
= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
)), 1)
4760 else if (local
->field
!= NULL_TREE
)
4761 fieldpos
= int_byte_position (local
->field
);
4765 /* Output any buffered-up bit-fields preceding this element. */
4766 if (local
->byte_buffer_in_use
)
4768 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4769 local
->total_bytes
++;
4770 local
->byte_buffer_in_use
= false;
4773 /* Advance to offset of this element.
4774 Note no alignment needed in an array, since that is guaranteed
4775 if each element has the proper size. */
4776 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4777 && fieldpos
!= local
->total_bytes
)
4779 gcc_assert (fieldpos
>= local
->total_bytes
);
4780 assemble_zeros (fieldpos
- local
->total_bytes
);
4781 local
->total_bytes
= fieldpos
;
4784 /* Find the alignment of this element. */
4785 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
4787 /* Determine size this element should occupy. */
4792 /* If this is an array with an unspecified upper bound,
4793 the initializer determines the size. */
4794 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4795 but we cannot do this until the deprecated support for
4796 initializing zero-length array members is removed. */
4797 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
4798 && TYPE_DOMAIN (TREE_TYPE (local
->field
))
4799 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
))))
4801 fieldsize
= array_size_for_constructor (local
->val
);
4802 /* Given a non-empty initialization, this field had
4804 gcc_assert (!fieldsize
|| !DECL_CHAIN (local
->field
));
4807 fieldsize
= tree_low_cst (DECL_SIZE_UNIT (local
->field
), 1);
4810 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
4812 /* Output the element's initial value. */
4813 if (local
->val
== NULL_TREE
)
4814 assemble_zeros (fieldsize
);
4816 output_constant (local
->val
, fieldsize
, align2
);
4818 /* Count its size. */
4819 local
->total_bytes
+= fieldsize
;
4822 /* Helper for output_constructor. From the current LOCAL and OUTER states,
4823 output an element that is a true bitfield or part of an outer one. */
4826 output_constructor_bitfield (oc_local_state
*local
, oc_outer_state
*outer
)
4828 /* Bit size of this element. */
4829 HOST_WIDE_INT ebitsize
4831 ? tree_low_cst (DECL_SIZE (local
->field
), 1)
4832 : tree_low_cst (TYPE_SIZE (TREE_TYPE (local
->type
)), 1));
4834 /* Relative index of this element if this is an array component. */
4835 HOST_WIDE_INT relative_index
4838 ? (tree_low_cst (local
->index
, 0)
4839 - tree_low_cst (local
->min_index
, 0))
4840 : local
->last_relative_index
+ 1)
4843 /* Bit position of this element from the start of the containing
4845 HOST_WIDE_INT constructor_relative_ebitpos
4847 ? int_bit_position (local
->field
)
4848 : ebitsize
* relative_index
);
4850 /* Bit position of this element from the start of a possibly ongoing
4851 outer byte buffer. */
4852 HOST_WIDE_INT byte_relative_ebitpos
4853 = ((outer
? outer
->bit_offset
: 0) + constructor_relative_ebitpos
);
4855 /* From the start of a possibly ongoing outer byte buffer, offsets to
4856 the first bit of this element and to the first bit past the end of
4858 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
4859 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
4861 local
->last_relative_index
= relative_index
;
4863 if (local
->val
== NULL_TREE
)
4864 local
->val
= integer_zero_node
;
4866 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
4867 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
4868 local
->val
= TREE_OPERAND (local
->val
, 0);
4870 if (TREE_CODE (local
->val
) != INTEGER_CST
4871 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
4873 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
4877 /* If this field does not start in this (or, next) byte,
4879 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4881 /* Output remnant of any bit field in previous bytes. */
4882 if (local
->byte_buffer_in_use
)
4884 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4885 local
->total_bytes
++;
4886 local
->byte_buffer_in_use
= false;
4889 /* If still not at proper byte, advance to there. */
4890 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4892 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
4893 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
4894 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
4898 /* Set up the buffer if necessary. */
4899 if (!local
->byte_buffer_in_use
)
4903 local
->byte_buffer_in_use
= true;
4906 /* If this is nested constructor, recurse passing the bit offset and the
4907 pending data, then retrieve the new pending data afterwards. */
4908 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
4910 oc_outer_state output_state
;
4912 output_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
4913 output_state
.byte
= local
->byte
;
4915 += output_constructor (local
->val
, 0, 0, &output_state
);
4916 local
->byte
= output_state
.byte
;
4920 /* Otherwise, we must split the element into pieces that fall within
4921 separate bytes, and combine each byte with previous or following
4923 while (next_offset
< end_offset
)
4927 HOST_WIDE_INT value
;
4928 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
4929 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
4931 /* Advance from byte to byte
4932 within this element when necessary. */
4933 while (next_byte
!= local
->total_bytes
)
4935 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4936 local
->total_bytes
++;
4940 /* Number of bits we can process at once
4941 (all part of the same byte). */
4942 this_time
= MIN (end_offset
- next_offset
,
4943 BITS_PER_UNIT
- next_bit
);
4944 if (BYTES_BIG_ENDIAN
)
4946 /* On big-endian machine, take the most significant bits
4947 first (of the bits that are significant)
4948 and put them into bytes from the most significant end. */
4949 shift
= end_offset
- next_offset
- this_time
;
4951 /* Don't try to take a bunch of bits that cross
4952 the word boundary in the INTEGER_CST. We can
4953 only select bits from the LOW or HIGH part
4955 if (shift
< HOST_BITS_PER_WIDE_INT
4956 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4958 this_time
= shift
+ this_time
- HOST_BITS_PER_WIDE_INT
;
4959 shift
= HOST_BITS_PER_WIDE_INT
;
4962 /* Now get the bits from the appropriate constant word. */
4963 if (shift
< HOST_BITS_PER_WIDE_INT
)
4964 value
= TREE_INT_CST_LOW (local
->val
);
4967 gcc_assert (shift
< HOST_BITS_PER_DOUBLE_INT
);
4968 value
= TREE_INT_CST_HIGH (local
->val
);
4969 shift
-= HOST_BITS_PER_WIDE_INT
;
4972 /* Get the result. This works only when:
4973 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4974 local
->byte
|= (((value
>> shift
)
4975 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
4976 << (BITS_PER_UNIT
- this_time
- next_bit
));
4980 /* On little-endian machines,
4981 take first the least significant bits of the value
4982 and pack them starting at the least significant
4983 bits of the bytes. */
4984 shift
= next_offset
- byte_relative_ebitpos
;
4986 /* Don't try to take a bunch of bits that cross
4987 the word boundary in the INTEGER_CST. We can
4988 only select bits from the LOW or HIGH part
4990 if (shift
< HOST_BITS_PER_WIDE_INT
4991 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4992 this_time
= (HOST_BITS_PER_WIDE_INT
- shift
);
4994 /* Now get the bits from the appropriate constant word. */
4995 if (shift
< HOST_BITS_PER_WIDE_INT
)
4996 value
= TREE_INT_CST_LOW (local
->val
);
4999 gcc_assert (shift
< HOST_BITS_PER_DOUBLE_INT
);
5000 value
= TREE_INT_CST_HIGH (local
->val
);
5001 shift
-= HOST_BITS_PER_WIDE_INT
;
5004 /* Get the result. This works only when:
5005 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5006 local
->byte
|= (((value
>> shift
)
5007 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5011 next_offset
+= this_time
;
5012 local
->byte_buffer_in_use
= true;
5016 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5017 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5018 caller output state of relevance in recursive invocations. */
5020 static unsigned HOST_WIDE_INT
5021 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
5022 unsigned int align
, oc_outer_state
* outer
)
5024 unsigned HOST_WIDE_INT cnt
;
5025 constructor_elt
*ce
;
5027 oc_local_state local
;
5029 /* Setup our local state to communicate with helpers. */
5032 local
.align
= align
;
5034 local
.total_bytes
= 0;
5035 local
.byte_buffer_in_use
= outer
!= NULL
;
5036 local
.byte
= outer
? outer
->byte
: 0;
5038 local
.type
= TREE_TYPE (exp
);
5040 local
.last_relative_index
= -1;
5042 local
.min_index
= NULL_TREE
;
5043 if (TREE_CODE (local
.type
) == ARRAY_TYPE
5044 && TYPE_DOMAIN (local
.type
) != NULL_TREE
)
5045 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5047 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5049 /* As CE goes through the elements of the constant, FIELD goes through the
5050 structure fields if the constant is a structure. If the constant is a
5051 union, we override this by getting the field from the TREE_LIST element.
5052 But the constant could also be an array. Then FIELD is zero.
5054 There is always a maximum of one element in the chain LINK for unions
5055 (even if the initializer in a source program incorrectly contains
5058 local
.field
= NULL_TREE
;
5059 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5060 local
.field
= TYPE_FIELDS (local
.type
);
5063 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5064 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5066 local
.val
= ce
->value
;
5067 local
.index
= NULL_TREE
;
5069 /* The element in a union constructor specifies the proper field
5071 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5072 local
.field
= ce
->index
;
5074 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5075 local
.index
= ce
->index
;
5077 if (local
.field
&& flag_verbose_asm
)
5078 fprintf (asm_out_file
, "%s %s:\n",
5080 DECL_NAME (local
.field
)
5081 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5084 /* Eliminate the marker that makes a cast not be an lvalue. */
5085 if (local
.val
!= NULL_TREE
)
5086 STRIP_NOPS (local
.val
);
5088 /* Output the current element, using the appropriate helper ... */
5090 /* For an array slice not part of an outer bitfield. */
5092 && local
.index
!= NULL_TREE
5093 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5094 output_constructor_array_range (&local
);
5096 /* For a field that is neither a true bitfield nor part of an outer one,
5097 known to be at least byte aligned and multiple-of-bytes long. */
5099 && (local
.field
== NULL_TREE
5100 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5101 output_constructor_regular_field (&local
);
5103 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5104 supported for scalar fields, so we may need to convert first. */
5107 if (TREE_CODE (local
.val
) == REAL_CST
)
5109 = fold_unary (VIEW_CONVERT_EXPR
,
5110 build_nonstandard_integer_type
5111 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5113 output_constructor_bitfield (&local
, outer
);
5117 /* If we are not at toplevel, save the pending data for our caller.
5118 Otherwise output the pending data and padding zeros as needed. */
5120 outer
->byte
= local
.byte
;
5123 if (local
.byte_buffer_in_use
)
5125 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5126 local
.total_bytes
++;
5129 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5131 assemble_zeros (local
.size
- local
.total_bytes
);
5132 local
.total_bytes
= local
.size
;
5136 return local
.total_bytes
;
5139 /* Mark DECL as weak. */
5142 mark_weak (tree decl
)
5144 DECL_WEAK (decl
) = 1;
5146 if (DECL_RTL_SET_P (decl
)
5147 && MEM_P (DECL_RTL (decl
))
5148 && XEXP (DECL_RTL (decl
), 0)
5149 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5150 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5153 /* Merge weak status between NEWDECL and OLDDECL. */
5156 merge_weak (tree newdecl
, tree olddecl
)
5158 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5160 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5163 /* We put the NEWDECL on the weak_decls list at some point
5164 and OLDDECL as well. Keep just OLDDECL on the list. */
5165 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5166 if (TREE_VALUE (*pwd
) == newdecl
)
5168 *pwd
= TREE_CHAIN (*pwd
);
5175 if (DECL_WEAK (newdecl
))
5179 /* NEWDECL is weak, but OLDDECL is not. */
5181 /* If we already output the OLDDECL, we're in trouble; we can't
5182 go back and make it weak. This should never happen in
5183 unit-at-a-time compilation. */
5184 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5186 /* If we've already generated rtl referencing OLDDECL, we may
5187 have done so in a way that will not function properly with
5188 a weak symbol. Again in unit-at-a-time this should be
5190 gcc_assert (!TREE_USED (olddecl
)
5191 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5193 if (TARGET_SUPPORTS_WEAK
)
5195 /* We put the NEWDECL on the weak_decls list at some point.
5196 Replace it with the OLDDECL. */
5197 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5198 if (TREE_VALUE (wd
) == newdecl
)
5200 TREE_VALUE (wd
) = olddecl
;
5203 /* We may not find the entry on the list. If NEWDECL is a
5204 weak alias, then we will have already called
5205 globalize_decl to remove the entry; in that case, we do
5206 not need to do anything. */
5209 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5210 mark_weak (olddecl
);
5213 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5214 weak. Just update NEWDECL to indicate that it's weak too. */
5215 mark_weak (newdecl
);
5218 /* Declare DECL to be a weak symbol. */
5221 declare_weak (tree decl
)
5223 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5224 if (! TREE_PUBLIC (decl
))
5225 error ("weak declaration of %q+D must be public", decl
);
5226 else if (!TARGET_SUPPORTS_WEAK
)
5227 warning (0, "weak declaration of %q+D not supported", decl
);
5230 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5231 DECL_ATTRIBUTES (decl
)
5232 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5236 weak_finish_1 (tree decl
)
5238 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5239 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5242 if (! TREE_USED (decl
))
5245 #ifdef ASM_WEAKEN_DECL
5246 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5248 #ifdef ASM_WEAKEN_LABEL
5249 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5251 #ifdef ASM_OUTPUT_WEAK_ALIAS
5253 static bool warn_once
= 0;
5256 warning (0, "only weak aliases are supported in this configuration");
5266 /* Fiven an assembly name, find the decl it is associated with. */
5268 find_decl (tree target
)
5270 symtab_node node
= symtab_node_for_asm (target
);
5272 return node
->symbol
.decl
;
5276 /* This TREE_LIST contains weakref targets. */
5278 static GTY(()) tree weakref_targets
;
5280 /* Emit any pending weak declarations. */
5287 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5289 tree alias_decl
= TREE_PURPOSE (t
);
5290 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5292 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5293 /* Remove alias_decl from the weak list, but leave entries for
5294 the target alone. */
5296 #ifndef ASM_OUTPUT_WEAKREF
5297 else if (! TREE_SYMBOL_REFERENCED (target
))
5299 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5300 defined, otherwise we and weak_finish_1 would use
5301 different macros. */
5302 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5303 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5305 tree decl
= find_decl (target
);
5309 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5310 TREE_CODE (alias_decl
), target
,
5311 TREE_TYPE (alias_decl
));
5313 DECL_EXTERNAL (decl
) = 1;
5314 TREE_PUBLIC (decl
) = 1;
5315 DECL_ARTIFICIAL (decl
) = 1;
5316 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5317 TREE_USED (decl
) = 1;
5320 weak_finish_1 (decl
);
5329 /* Remove the alias and the target from the pending weak list
5330 so that we do not emit any .weak directives for the former,
5331 nor multiple .weak directives for the latter. */
5332 for (p
= &weak_decls
; (t2
= *p
) ; )
5334 if (TREE_VALUE (t2
) == alias_decl
5335 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5336 *p
= TREE_CHAIN (t2
);
5338 p
= &TREE_CHAIN (t2
);
5341 /* Remove other weakrefs to the same target, to speed things up. */
5342 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5344 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5345 *p
= TREE_CHAIN (t2
);
5347 p
= &TREE_CHAIN (t2
);
5352 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5354 tree decl
= TREE_VALUE (t
);
5356 weak_finish_1 (decl
);
5360 /* Emit the assembly bits to indicate that DECL is globally visible. */
5363 globalize_decl (tree decl
)
5366 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5367 if (DECL_WEAK (decl
))
5369 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5372 #ifdef ASM_WEAKEN_DECL
5373 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5375 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5378 /* Remove this function from the pending weak list so that
5379 we do not emit multiple .weak directives for it. */
5380 for (p
= &weak_decls
; (t
= *p
) ; )
5382 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5383 *p
= TREE_CHAIN (t
);
5385 p
= &TREE_CHAIN (t
);
5388 /* Remove weakrefs to the same target from the pending weakref
5389 list, for the same reason. */
5390 for (p
= &weakref_targets
; (t
= *p
) ; )
5392 if (DECL_ASSEMBLER_NAME (decl
)
5393 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5394 *p
= TREE_CHAIN (t
);
5396 p
= &TREE_CHAIN (t
);
5403 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5406 vec
<alias_pair
, va_gc
> *alias_pairs
;
5408 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5409 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5410 tree node is DECL to have the value of the tree node TARGET. */
5413 do_assemble_alias (tree decl
, tree target
)
5415 /* Emulated TLS had better not get this var. */
5416 gcc_assert(!(!targetm
.have_tls
5417 && TREE_CODE (decl
) == VAR_DECL
5418 && DECL_THREAD_LOCAL_P (decl
)));
5420 if (TREE_ASM_WRITTEN (decl
))
5423 /* We must force creation of DECL_RTL for debug info generation, even though
5424 we don't use it here. */
5425 make_decl_rtl (decl
);
5427 TREE_ASM_WRITTEN (decl
) = 1;
5428 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5430 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5432 ultimate_transparent_alias_target (&target
);
5434 if (!TREE_SYMBOL_REFERENCED (target
))
5435 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5437 #ifdef ASM_OUTPUT_WEAKREF
5438 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5439 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5440 IDENTIFIER_POINTER (target
));
5442 if (!TARGET_SUPPORTS_WEAK
)
5444 error_at (DECL_SOURCE_LOCATION (decl
),
5445 "weakref is not supported in this configuration");
5452 #ifdef ASM_OUTPUT_DEF
5453 /* Make name accessible from other files, if appropriate. */
5455 if (TREE_PUBLIC (decl
))
5457 globalize_decl (decl
);
5458 maybe_assemble_visibility (decl
);
5460 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5462 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE) && HAVE_GNU_INDIRECT_FUNCTION
5463 ASM_OUTPUT_TYPE_DIRECTIVE
5464 (asm_out_file
, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5467 error_at (DECL_SOURCE_LOCATION (decl
),
5468 "ifunc is not supported in this configuration");
5472 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5473 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5475 ASM_OUTPUT_DEF (asm_out_file
,
5476 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5477 IDENTIFIER_POINTER (target
));
5479 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5484 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5485 # ifdef ASM_WEAKEN_DECL
5486 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5488 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5490 /* Remove this function from the pending weak list so that
5491 we do not emit multiple .weak directives for it. */
5492 for (p
= &weak_decls
; (t
= *p
) ; )
5493 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5494 *p
= TREE_CHAIN (t
);
5496 p
= &TREE_CHAIN (t
);
5498 /* Remove weakrefs to the same target from the pending weakref
5499 list, for the same reason. */
5500 for (p
= &weakref_targets
; (t
= *p
) ; )
5502 if (DECL_ASSEMBLER_NAME (decl
)
5503 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5504 *p
= TREE_CHAIN (t
);
5506 p
= &TREE_CHAIN (t
);
5512 /* Emit an assembler directive to make the symbol for DECL an alias to
5513 the symbol for TARGET. */
5516 assemble_alias (tree decl
, tree target
)
5520 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5522 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5524 ultimate_transparent_alias_target (&target
);
5526 if (alias
== target
)
5527 error ("weakref %q+D ultimately targets itself", decl
);
5530 #ifndef ASM_OUTPUT_WEAKREF
5531 IDENTIFIER_TRANSPARENT_ALIAS (alias
) = 1;
5532 TREE_CHAIN (alias
) = target
;
5535 if (TREE_PUBLIC (decl
))
5536 error ("weakref %q+D must have static linkage", decl
);
5540 #if !defined (ASM_OUTPUT_DEF)
5541 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5542 error_at (DECL_SOURCE_LOCATION (decl
),
5543 "alias definitions not supported in this configuration");
5546 if (!DECL_WEAK (decl
))
5548 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5549 error_at (DECL_SOURCE_LOCATION (decl
),
5550 "ifunc is not supported in this configuration");
5552 error_at (DECL_SOURCE_LOCATION (decl
),
5553 "only weak aliases are supported in this configuration");
5559 TREE_USED (decl
) = 1;
5561 /* Allow aliases to aliases. */
5562 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5563 cgraph_get_create_node (decl
)->alias
= true;
5565 varpool_node_for_decl (decl
)->alias
= true;
5567 /* If the target has already been emitted, we don't have to queue the
5568 alias. This saves a tad of memory. */
5569 if (cgraph_global_info_ready
)
5570 target_decl
= find_decl (target
);
5573 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5574 || cgraph_state
>= CGRAPH_STATE_EXPANSION
)
5575 do_assemble_alias (decl
, target
);
5578 alias_pair p
= {decl
, target
};
5579 vec_safe_push (alias_pairs
, p
);
5583 /* Record and output a table of translations from original function
5584 to its transaction aware clone. Note that tm_pure functions are
5585 considered to be their own clone. */
5587 static GTY((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
5588 htab_t tm_clone_hash
;
5591 record_tm_clone_pair (tree o
, tree n
)
5593 struct tree_map
**slot
, *h
;
5595 if (tm_clone_hash
== NULL
)
5596 tm_clone_hash
= htab_create_ggc (32, tree_map_hash
, tree_map_eq
, 0);
5598 h
= ggc_alloc_tree_map ();
5599 h
->hash
= htab_hash_pointer (o
);
5603 slot
= (struct tree_map
**)
5604 htab_find_slot_with_hash (tm_clone_hash
, h
, h
->hash
, INSERT
);
5609 get_tm_clone_pair (tree o
)
5613 struct tree_map
*h
, in
;
5616 in
.hash
= htab_hash_pointer (o
);
5617 h
= (struct tree_map
*) htab_find_with_hash (tm_clone_hash
,
5625 typedef struct tm_alias_pair
5633 /* Helper function for finish_tm_clone_pairs. Dump a hash table entry
5634 into a VEC in INFO. */
5637 dump_tm_clone_to_vec (void **slot
, void *info
)
5639 struct tree_map
*map
= (struct tree_map
*) *slot
;
5640 vec
<tm_alias_pair
> *tm_alias_pairs
= (vec
<tm_alias_pair
> *) info
;
5641 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5642 tm_alias_pairs
->safe_push (p
);
5646 /* Dump the actual pairs to the .tm_clone_table section. */
5649 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5653 bool switched
= false;
5655 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5659 struct cgraph_node
*src_n
= cgraph_get_node (src
);
5660 struct cgraph_node
*dst_n
= cgraph_get_node (dst
);
5662 /* The function ipa_tm_create_version() marks the clone as needed if
5663 the original function was needed. But we also mark the clone as
5664 needed if we ever called the clone indirectly through
5665 TM_GETTMCLONE. If neither of these are true, we didn't generate
5666 a clone, and we didn't call it indirectly... no sense keeping it
5667 in the clone table. */
5668 if (!dst_n
|| !dst_n
->analyzed
)
5671 /* This covers the case where we have optimized the original
5672 function away, and only access the transactional clone. */
5673 if (!src_n
|| !src_n
->analyzed
)
5678 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5679 assemble_align (POINTER_SIZE
);
5683 assemble_integer (XEXP (DECL_RTL (src
), 0),
5684 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5685 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5686 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5690 /* Provide a default for the tm_clone_table section. */
5693 default_clone_table_section (void)
5695 return get_named_section (NULL
, ".tm_clone_table", 3);
5698 /* Helper comparison function for qsorting by the DECL_UID stored in
5699 alias_pair->emitted_diags. */
5702 tm_alias_pair_cmp (const void *x
, const void *y
)
5704 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5705 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5706 if (p1
->uid
< p2
->uid
)
5708 if (p1
->uid
> p2
->uid
)
5714 finish_tm_clone_pairs (void)
5716 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5718 if (tm_clone_hash
== NULL
)
5721 /* We need a determenistic order for the .tm_clone_table, otherwise
5722 we will get bootstrap comparison failures, so dump the hash table
5723 to a vector, sort it, and dump the vector. */
5725 /* Dump the hashtable to a vector. */
5726 htab_traverse_noresize (tm_clone_hash
, dump_tm_clone_to_vec
,
5727 (void *) &tm_alias_pairs
);
5729 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5732 dump_tm_clone_pairs (tm_alias_pairs
);
5734 htab_delete (tm_clone_hash
);
5735 tm_clone_hash
= NULL
;
5736 tm_alias_pairs
.release ();
5740 /* Emit an assembler directive to set symbol for DECL visibility to
5741 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5744 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5745 int vis ATTRIBUTE_UNUSED
)
5747 #ifdef HAVE_GAS_HIDDEN
5748 static const char * const visibility_types
[] = {
5749 NULL
, "protected", "hidden", "internal"
5752 const char *name
, *type
;
5754 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5755 type
= visibility_types
[vis
];
5757 fprintf (asm_out_file
, "\t.%s\t", type
);
5758 assemble_name (asm_out_file
, name
);
5759 fprintf (asm_out_file
, "\n");
5761 warning (OPT_Wattributes
, "visibility attribute not supported "
5762 "in this configuration; ignored");
5766 /* A helper function to call assemble_visibility when needed for a decl. */
5769 maybe_assemble_visibility (tree decl
)
5771 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5773 if (vis
!= VISIBILITY_DEFAULT
)
5775 targetm
.asm_out
.assemble_visibility (decl
, vis
);
5782 /* Returns 1 if the target configuration supports defining public symbols
5783 so that one of them will be chosen at link time instead of generating a
5784 multiply-defined symbol error, whether through the use of weak symbols or
5785 a target-specific mechanism for having duplicates discarded. */
5788 supports_one_only (void)
5790 if (SUPPORTS_ONE_ONLY
)
5792 return TARGET_SUPPORTS_WEAK
;
5795 /* Set up DECL as a public symbol that can be defined in multiple
5796 translation units without generating a linker error. */
5799 make_decl_one_only (tree decl
, tree comdat_group
)
5801 gcc_assert (TREE_CODE (decl
) == VAR_DECL
5802 || TREE_CODE (decl
) == FUNCTION_DECL
);
5804 TREE_PUBLIC (decl
) = 1;
5806 if (SUPPORTS_ONE_ONLY
)
5808 #ifdef MAKE_DECL_ONE_ONLY
5809 MAKE_DECL_ONE_ONLY (decl
);
5811 DECL_COMDAT_GROUP (decl
) = comdat_group
;
5813 else if (TREE_CODE (decl
) == VAR_DECL
5814 && (DECL_INITIAL (decl
) == 0 || DECL_INITIAL (decl
) == error_mark_node
))
5815 DECL_COMMON (decl
) = 1;
5818 gcc_assert (TARGET_SUPPORTS_WEAK
);
5819 DECL_WEAK (decl
) = 1;
5824 init_varasm_once (void)
5826 section_htab
= htab_create_ggc (31, section_entry_hash
,
5827 section_entry_eq
, NULL
);
5828 object_block_htab
= htab_create_ggc (31, object_block_entry_hash
,
5829 object_block_entry_eq
, NULL
);
5830 const_desc_htab
= htab_create_ggc (1009, const_desc_hash
,
5831 const_desc_eq
, NULL
);
5833 const_alias_set
= new_alias_set ();
5834 shared_constant_pool
= create_constant_pool ();
5836 #ifdef TEXT_SECTION_ASM_OP
5837 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
5838 TEXT_SECTION_ASM_OP
);
5841 #ifdef DATA_SECTION_ASM_OP
5842 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5843 DATA_SECTION_ASM_OP
);
5846 #ifdef SDATA_SECTION_ASM_OP
5847 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5848 SDATA_SECTION_ASM_OP
);
5851 #ifdef READONLY_DATA_SECTION_ASM_OP
5852 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
5853 READONLY_DATA_SECTION_ASM_OP
);
5856 #ifdef CTORS_SECTION_ASM_OP
5857 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
5858 CTORS_SECTION_ASM_OP
);
5861 #ifdef DTORS_SECTION_ASM_OP
5862 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
5863 DTORS_SECTION_ASM_OP
);
5866 #ifdef BSS_SECTION_ASM_OP
5867 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5868 output_section_asm_op
,
5869 BSS_SECTION_ASM_OP
);
5872 #ifdef SBSS_SECTION_ASM_OP
5873 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5874 output_section_asm_op
,
5875 SBSS_SECTION_ASM_OP
);
5878 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5879 | SECTION_COMMON
, emit_tls_common
);
5880 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5881 | SECTION_COMMON
, emit_local
);
5882 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5883 | SECTION_COMMON
, emit_common
);
5885 #if defined ASM_OUTPUT_ALIGNED_BSS
5886 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
5890 targetm
.asm_out
.init_sections ();
5892 if (readonly_data_section
== NULL
)
5893 readonly_data_section
= text_section
;
5897 decl_default_tls_model (const_tree decl
)
5899 enum tls_model kind
;
5902 is_local
= targetm
.binds_local_p (decl
);
5906 kind
= TLS_MODEL_LOCAL_EXEC
;
5908 kind
= TLS_MODEL_INITIAL_EXEC
;
5911 /* Local dynamic is inefficient when we're not combining the
5912 parts of the address. */
5913 else if (optimize
&& is_local
)
5914 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
5916 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
5917 if (kind
< flag_tls_default
)
5918 kind
= flag_tls_default
;
5923 /* Select a set of attributes for section NAME based on the properties
5924 of DECL and whether or not RELOC indicates that DECL's initializer
5925 might contain runtime relocations.
5927 We make the section read-only and executable for a function decl,
5928 read-only for a const data decl, and writable for a non-const data decl. */
5931 default_section_type_flags (tree decl
, const char *name
, int reloc
)
5935 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
5936 flags
= SECTION_CODE
;
5939 enum section_category category
5940 = categorize_decl_for_section (decl
, reloc
);
5941 if (decl_readonly_section_1 (category
))
5943 else if (category
== SECCAT_DATA_REL_RO
5944 || category
== SECCAT_DATA_REL_RO_LOCAL
)
5945 flags
= SECTION_WRITE
| SECTION_RELRO
;
5947 flags
= SECTION_WRITE
;
5951 flags
= SECTION_WRITE
;
5952 if (strcmp (name
, ".data.rel.ro") == 0
5953 || strcmp (name
, ".data.rel.ro.local") == 0)
5954 flags
|= SECTION_RELRO
;
5957 if (decl
&& DECL_ONE_ONLY (decl
))
5958 flags
|= SECTION_LINKONCE
;
5960 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
5961 flags
|= SECTION_TLS
| SECTION_WRITE
;
5963 if (strcmp (name
, ".bss") == 0
5964 || strncmp (name
, ".bss.", 5) == 0
5965 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
5966 || strcmp (name
, ".sbss") == 0
5967 || strncmp (name
, ".sbss.", 6) == 0
5968 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
5969 flags
|= SECTION_BSS
;
5971 if (strcmp (name
, ".tdata") == 0
5972 || strncmp (name
, ".tdata.", 7) == 0
5973 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
5974 flags
|= SECTION_TLS
;
5976 if (strcmp (name
, ".tbss") == 0
5977 || strncmp (name
, ".tbss.", 6) == 0
5978 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
5979 flags
|= SECTION_TLS
| SECTION_BSS
;
5981 /* These three sections have special ELF types. They are neither
5982 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
5983 want to print a section type (@progbits or @nobits). If someone
5984 is silly enough to emit code or TLS variables to one of these
5985 sections, then don't handle them specially. */
5986 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
5987 && (strcmp (name
, ".init_array") == 0
5988 || strcmp (name
, ".fini_array") == 0
5989 || strcmp (name
, ".preinit_array") == 0))
5990 flags
|= SECTION_NOTYPE
;
5995 /* Return true if the target supports some form of global BSS,
5996 either through bss_noswitch_section, or by selecting a BSS
5997 section in TARGET_ASM_SELECT_SECTION. */
6000 have_global_bss_p (void)
6002 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6005 /* Output assembly to switch to section NAME with attribute FLAGS.
6006 Four variants for common object file formats. */
6009 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6010 unsigned int flags ATTRIBUTE_UNUSED
,
6011 tree decl ATTRIBUTE_UNUSED
)
6013 /* Some object formats don't support named sections at all. The
6014 front-end should already have flagged this as an error. */
6018 #ifndef TLS_SECTION_ASM_FLAG
6019 #define TLS_SECTION_ASM_FLAG 'T'
6023 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6024 tree decl ATTRIBUTE_UNUSED
)
6026 char flagchars
[10], *f
= flagchars
;
6028 /* If we have already declared this section, we can use an
6029 abbreviated form to switch back to it -- unless this section is
6030 part of a COMDAT groups, in which case GAS requires the full
6031 declaration every time. */
6032 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6033 && (flags
& SECTION_DECLARED
))
6035 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6039 if (!(flags
& SECTION_DEBUG
))
6041 if (flags
& SECTION_EXCLUDE
)
6043 if (flags
& SECTION_WRITE
)
6045 if (flags
& SECTION_CODE
)
6047 if (flags
& SECTION_SMALL
)
6049 if (flags
& SECTION_MERGE
)
6051 if (flags
& SECTION_STRINGS
)
6053 if (flags
& SECTION_TLS
)
6054 *f
++ = TLS_SECTION_ASM_FLAG
;
6055 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6059 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6061 if (!(flags
& SECTION_NOTYPE
))
6066 if (flags
& SECTION_BSS
)
6072 /* On platforms that use "@" as the assembly comment character,
6074 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6076 fprintf (asm_out_file
, format
, type
);
6078 if (flags
& SECTION_ENTSIZE
)
6079 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6080 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6082 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6083 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6085 fprintf (asm_out_file
, ",%s,comdat",
6086 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6090 putc ('\n', asm_out_file
);
6094 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6095 tree decl ATTRIBUTE_UNUSED
)
6097 char flagchars
[8], *f
= flagchars
;
6099 if (flags
& SECTION_WRITE
)
6101 if (flags
& SECTION_CODE
)
6105 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6109 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6112 default_coff_asm_named_section (name
, flags
, decl
);
6114 if (flags
& SECTION_LINKONCE
)
6116 /* Functions may have been compiled at various levels of
6117 optimization so we can't use `same_size' here.
6118 Instead, have the linker pick one. */
6119 fprintf (asm_out_file
, "\t.linkonce %s\n",
6120 (flags
& SECTION_CODE
? "discard" : "same_size"));
6124 /* The lame default section selector. */
6127 default_select_section (tree decl
, int reloc
,
6128 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6132 if (decl_readonly_section (decl
, reloc
))
6133 return readonly_data_section
;
6135 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6137 if (! ((flag_pic
&& reloc
)
6138 || !TREE_READONLY (decl
)
6139 || TREE_SIDE_EFFECTS (decl
)
6140 || !TREE_CONSTANT (decl
)))
6141 return readonly_data_section
;
6143 else if (TREE_CODE (decl
) == STRING_CST
)
6144 return readonly_data_section
;
6145 else if (! (flag_pic
&& reloc
))
6146 return readonly_data_section
;
6148 return data_section
;
6151 enum section_category
6152 categorize_decl_for_section (const_tree decl
, int reloc
)
6154 enum section_category ret
;
6156 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6158 else if (TREE_CODE (decl
) == STRING_CST
)
6160 if (flag_mudflap
) /* or !flag_merge_constants */
6161 return SECCAT_RODATA
;
6163 return SECCAT_RODATA_MERGE_STR
;
6165 else if (TREE_CODE (decl
) == VAR_DECL
)
6167 if (bss_initializer_p (decl
))
6169 else if (! TREE_READONLY (decl
)
6170 || TREE_SIDE_EFFECTS (decl
)
6171 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6173 /* Here the reloc_rw_mask is not testing whether the section should
6174 be read-only or not, but whether the dynamic link will have to
6175 do something. If so, we wish to segregate the data in order to
6176 minimize cache misses inside the dynamic linker. */
6177 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6178 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6182 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6183 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6184 else if (reloc
|| flag_merge_constants
< 2)
6185 /* C and C++ don't allow different variables to share the same
6186 location. -fmerge-all-constants allows even that (at the
6187 expense of not conforming). */
6188 ret
= SECCAT_RODATA
;
6189 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6190 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6192 ret
= SECCAT_RODATA_MERGE_CONST
;
6194 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6196 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6197 || TREE_SIDE_EFFECTS (decl
)
6198 || ! TREE_CONSTANT (decl
))
6201 ret
= SECCAT_RODATA
;
6204 ret
= SECCAT_RODATA
;
6206 /* There are no read-only thread-local sections. */
6207 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6209 /* Note that this would be *just* SECCAT_BSS, except that there's
6210 no concept of a read-only thread-local-data section. */
6211 if (ret
== SECCAT_BSS
6212 || (flag_zero_initialized_in_bss
6213 && initializer_zerop (DECL_INITIAL (decl
))))
6219 /* If the target uses small data sections, select it. */
6220 else if (targetm
.in_small_data_p (decl
))
6222 if (ret
== SECCAT_BSS
)
6224 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6225 ret
= SECCAT_SRODATA
;
6234 decl_readonly_section_1 (enum section_category category
)
6239 case SECCAT_RODATA_MERGE_STR
:
6240 case SECCAT_RODATA_MERGE_STR_INIT
:
6241 case SECCAT_RODATA_MERGE_CONST
:
6242 case SECCAT_SRODATA
:
6250 decl_readonly_section (const_tree decl
, int reloc
)
6252 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6255 /* Select a section based on the above categorization. */
6258 default_elf_select_section (tree decl
, int reloc
,
6259 unsigned HOST_WIDE_INT align
)
6262 switch (categorize_decl_for_section (decl
, reloc
))
6265 /* We're not supposed to be called on FUNCTION_DECLs. */
6268 return readonly_data_section
;
6269 case SECCAT_RODATA_MERGE_STR
:
6270 return mergeable_string_section (decl
, align
, 0);
6271 case SECCAT_RODATA_MERGE_STR_INIT
:
6272 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6273 case SECCAT_RODATA_MERGE_CONST
:
6274 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6275 case SECCAT_SRODATA
:
6279 return data_section
;
6280 case SECCAT_DATA_REL
:
6281 sname
= ".data.rel";
6283 case SECCAT_DATA_REL_LOCAL
:
6284 sname
= ".data.rel.local";
6286 case SECCAT_DATA_REL_RO
:
6287 sname
= ".data.rel.ro";
6289 case SECCAT_DATA_REL_RO_LOCAL
:
6290 sname
= ".data.rel.ro.local";
6315 return get_named_section (decl
, sname
, reloc
);
6318 /* Construct a unique section name based on the decl name and the
6319 categorization performed above. */
6322 default_unique_section (tree decl
, int reloc
)
6324 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6325 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6326 const char *prefix
, *name
, *linkonce
;
6329 switch (categorize_decl_for_section (decl
, reloc
))
6332 prefix
= one_only
? ".t" : ".text";
6335 case SECCAT_RODATA_MERGE_STR
:
6336 case SECCAT_RODATA_MERGE_STR_INIT
:
6337 case SECCAT_RODATA_MERGE_CONST
:
6338 prefix
= one_only
? ".r" : ".rodata";
6340 case SECCAT_SRODATA
:
6341 prefix
= one_only
? ".s2" : ".sdata2";
6344 prefix
= one_only
? ".d" : ".data";
6346 case SECCAT_DATA_REL
:
6347 prefix
= one_only
? ".d.rel" : ".data.rel";
6349 case SECCAT_DATA_REL_LOCAL
:
6350 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6352 case SECCAT_DATA_REL_RO
:
6353 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6355 case SECCAT_DATA_REL_RO_LOCAL
:
6356 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6359 prefix
= one_only
? ".s" : ".sdata";
6362 prefix
= one_only
? ".b" : ".bss";
6365 prefix
= one_only
? ".sb" : ".sbss";
6368 prefix
= one_only
? ".td" : ".tdata";
6371 prefix
= one_only
? ".tb" : ".tbss";
6377 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
6378 name
= targetm
.strip_name_encoding (name
);
6380 /* If we're using one_only, then there needs to be a .gnu.linkonce
6381 prefix to the section name. */
6382 linkonce
= one_only
? ".gnu.linkonce" : "";
6384 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6386 DECL_SECTION_NAME (decl
) = build_string (strlen (string
), string
);
6389 /* Like compute_reloc_for_constant, except for an RTX. The return value
6390 is a mask for which bit 1 indicates a global relocation, and bit 0
6391 indicates a local relocation. */
6394 compute_reloc_for_rtx_1 (rtx
*xp
, void *data
)
6396 int *preloc
= (int *) data
;
6399 switch (GET_CODE (x
))
6402 *preloc
|= SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6415 compute_reloc_for_rtx (rtx x
)
6419 switch (GET_CODE (x
))
6425 for_each_rtx (&x
, compute_reloc_for_rtx_1
, &reloc
);
6434 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
6436 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6438 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6439 return data_section
;
6441 return readonly_data_section
;
6445 default_elf_select_rtx_section (enum machine_mode mode
, rtx x
,
6446 unsigned HOST_WIDE_INT align
)
6448 int reloc
= compute_reloc_for_rtx (x
);
6450 /* ??? Handle small data here somehow. */
6452 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6455 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6457 return get_named_section (NULL
, ".data.rel.ro", 3);
6460 return mergeable_constant_section (mode
, align
, 0);
6463 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6466 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6471 /* Careful not to prod global register variables. */
6474 symbol
= XEXP (rtl
, 0);
6475 if (GET_CODE (symbol
) != SYMBOL_REF
)
6478 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6479 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6480 flags
|= SYMBOL_FLAG_FUNCTION
;
6481 if (targetm
.binds_local_p (decl
))
6482 flags
|= SYMBOL_FLAG_LOCAL
;
6483 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6484 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6485 else if (targetm
.in_small_data_p (decl
))
6486 flags
|= SYMBOL_FLAG_SMALL
;
6487 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6488 being PUBLIC, the thing *must* be defined in this translation unit.
6489 Prevent this buglet from being propagated into rtl code as well. */
6490 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6491 flags
|= SYMBOL_FLAG_EXTERNAL
;
6493 SYMBOL_REF_FLAGS (symbol
) = flags
;
6496 /* By default, we do nothing for encode_section_info, so we need not
6497 do anything but discard the '*' marker. */
6500 default_strip_name_encoding (const char *str
)
6502 return str
+ (*str
== '*');
6505 #ifdef ASM_OUTPUT_DEF
6506 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6507 anchor relative to ".", the current section position. */
6510 default_asm_output_anchor (rtx symbol
)
6514 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6515 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6516 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6520 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6523 default_use_anchors_for_symbol_p (const_rtx symbol
)
6528 /* Don't use anchors for mergeable sections. The linker might move
6529 the objects around. */
6530 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6531 if (sect
->common
.flags
& SECTION_MERGE
)
6534 /* Don't use anchors for small data sections. The small data register
6535 acts as an anchor for such sections. */
6536 if (sect
->common
.flags
& SECTION_SMALL
)
6539 decl
= SYMBOL_REF_DECL (symbol
);
6540 if (decl
&& DECL_P (decl
))
6542 /* Don't use section anchors for decls that might be defined by
6544 if (!targetm
.binds_local_p (decl
))
6547 /* Don't use section anchors for decls that will be placed in a
6548 small data section. */
6549 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6550 one above. The problem is that we only use SECTION_SMALL for
6551 sections that should be marked as small in the section directive. */
6552 if (targetm
.in_small_data_p (decl
))
6558 /* Return true when RESOLUTION indicate that symbol will be bound to the
6559 definition provided by current .o file. */
6562 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6564 return (resolution
== LDPR_PREVAILING_DEF
6565 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6566 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6569 /* Return true when RESOLUTION indicate that symbol will be bound locally
6570 within current executable or DSO. */
6573 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6575 return (resolution
== LDPR_PREVAILING_DEF
6576 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6577 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6578 || resolution
== LDPR_PREEMPTED_REG
6579 || resolution
== LDPR_PREEMPTED_IR
6580 || resolution
== LDPR_RESOLVED_IR
6581 || resolution
== LDPR_RESOLVED_EXEC
);
6584 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6585 wrt cross-module name binding. */
6588 default_binds_local_p (const_tree exp
)
6590 return default_binds_local_p_1 (exp
, flag_shlib
);
6594 default_binds_local_p_1 (const_tree exp
, int shlib
)
6597 bool resolved_locally
= false;
6598 bool resolved_to_local_def
= false;
6600 /* With resolution file in hands, take look into resolutions.
6601 We can't just return true for resolved_locally symbols,
6602 because dynamic linking might overwrite symbols
6603 in shared libraries. */
6604 if (TREE_CODE (exp
) == VAR_DECL
&& TREE_PUBLIC (exp
)
6605 && (TREE_STATIC (exp
) || DECL_EXTERNAL (exp
)))
6607 struct varpool_node
*vnode
= varpool_get_node (exp
);
6608 if (vnode
&& resolution_local_p (vnode
->symbol
.resolution
))
6609 resolved_locally
= true;
6611 && resolution_to_local_definition_p (vnode
->symbol
.resolution
))
6612 resolved_to_local_def
= true;
6614 else if (TREE_CODE (exp
) == FUNCTION_DECL
&& TREE_PUBLIC (exp
))
6616 struct cgraph_node
*node
= cgraph_get_node (exp
);
6618 && resolution_local_p (node
->symbol
.resolution
))
6619 resolved_locally
= true;
6621 && resolution_to_local_definition_p (node
->symbol
.resolution
))
6622 resolved_to_local_def
= true;
6625 /* A non-decl is an entry in the constant pool. */
6628 /* Weakrefs may not bind locally, even though the weakref itself is always
6629 static and therefore local. Similarly, the resolver for ifunc functions
6630 might resolve to a non-local function.
6631 FIXME: We can resolve the weakref case more curefuly by looking at the
6633 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6634 || (TREE_CODE (exp
) == FUNCTION_DECL
6635 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6637 /* Static variables are always local. */
6638 else if (! TREE_PUBLIC (exp
))
6640 /* A variable is local if the user has said explicitly that it will
6642 else if ((DECL_VISIBILITY_SPECIFIED (exp
)
6643 || resolved_to_local_def
)
6644 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6646 /* Variables defined outside this object might not be local. */
6647 else if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6649 /* If defined in this object and visibility is not default, must be
6651 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6653 /* Default visibility weak data can be overridden by a strong symbol
6654 in another module and so are not local. */
6655 else if (DECL_WEAK (exp
)
6656 && !resolved_locally
)
6658 /* If PIC, then assume that any global name can be overridden by
6659 symbols resolved from other modules. */
6662 /* Uninitialized COMMON variable may be unified with symbols
6663 resolved from other modules. */
6664 else if (DECL_COMMON (exp
)
6665 && !resolved_locally
6666 && (DECL_INITIAL (exp
) == NULL
6667 || DECL_INITIAL (exp
) == error_mark_node
))
6669 /* Otherwise we're left with initialized (or non-common) global data
6670 which is of necessity defined locally. */
6677 /* Return true when references to DECL must bind to current definition in
6680 The condition is usually equivalent to whether the function binds to the
6681 current module (shared library or executable), that is to binds_local_p.
6682 We use this fact to avoid need for another target hook and implement
6683 the logic using binds_local_p and just special cases where
6684 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6685 the weak definitions (that can be overwritten at linktime by other
6686 definition from different object file) and when resolution info is available
6687 we simply use the knowledge passed to us by linker plugin. */
6689 decl_binds_to_current_def_p (tree decl
)
6691 gcc_assert (DECL_P (decl
));
6692 if (!TREE_PUBLIC (decl
))
6694 if (!targetm
.binds_local_p (decl
))
6696 /* When resolution is available, just use it. */
6697 if (TREE_CODE (decl
) == VAR_DECL
6698 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)))
6700 struct varpool_node
*vnode
= varpool_get_node (decl
);
6702 && vnode
->symbol
.resolution
!= LDPR_UNKNOWN
)
6703 return resolution_to_local_definition_p (vnode
->symbol
.resolution
);
6705 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
6707 struct cgraph_node
*node
= cgraph_get_node (decl
);
6709 && node
->symbol
.resolution
!= LDPR_UNKNOWN
)
6710 return resolution_to_local_definition_p (node
->symbol
.resolution
);
6712 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6713 binds locally but still can be overwritten).
6714 This rely on fact that binds_local_p behave as decl_replaceable_p
6715 for all other declaration types. */
6716 return !DECL_WEAK (decl
);
6719 /* A replaceable function or variable is one which may be replaced
6720 at link-time with an entirely different definition, provided that the
6721 replacement has the same type. For example, functions declared
6722 with __attribute__((weak)) on most systems are replaceable.
6724 COMDAT functions are not replaceable, since all definitions of the
6725 function must be equivalent. It is important that COMDAT functions
6726 not be treated as replaceable so that use of C++ template
6727 instantiations is not penalized. */
6730 decl_replaceable_p (tree decl
)
6732 gcc_assert (DECL_P (decl
));
6733 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
6735 return !decl_binds_to_current_def_p (decl
);
6738 /* Default function to output code that will globalize a label. A
6739 target must define GLOBAL_ASM_OP or provide its own function to
6740 globalize a label. */
6741 #ifdef GLOBAL_ASM_OP
6743 default_globalize_label (FILE * stream
, const char *name
)
6745 fputs (GLOBAL_ASM_OP
, stream
);
6746 assemble_name (stream
, name
);
6747 putc ('\n', stream
);
6749 #endif /* GLOBAL_ASM_OP */
6751 /* Default function to output code that will globalize a declaration. */
6753 default_globalize_decl_name (FILE * stream
, tree decl
)
6755 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6756 targetm
.asm_out
.globalize_label (stream
, name
);
6759 /* Default function to output a label for unwind information. The
6760 default is to do nothing. A target that needs nonlocal labels for
6761 unwind information must provide its own function to do this. */
6763 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6764 tree decl ATTRIBUTE_UNUSED
,
6765 int for_eh ATTRIBUTE_UNUSED
,
6766 int empty ATTRIBUTE_UNUSED
)
6770 /* Default function to output a label to divide up the exception table.
6771 The default is to do nothing. A target that needs/wants to divide
6772 up the table must provide it's own function to do this. */
6774 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
6778 /* This is how to output an internal numbered label where PREFIX is
6779 the class of label and LABELNO is the number within the class. */
6782 default_generate_internal_label (char *buf
, const char *prefix
,
6783 unsigned long labelno
)
6785 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6788 /* This is how to output an internal numbered label where PREFIX is
6789 the class of label and LABELNO is the number within the class. */
6792 default_internal_label (FILE *stream
, const char *prefix
,
6793 unsigned long labelno
)
6795 char *const buf
= (char *) alloca (40 + strlen (prefix
));
6796 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6797 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
6801 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
6804 default_asm_declare_constant_name (FILE *file
, const char *name
,
6805 const_tree exp ATTRIBUTE_UNUSED
,
6806 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
6808 assemble_label (file
, name
);
6811 /* This is the default behavior at the beginning of a file. It's
6812 controlled by two other target-hook toggles. */
6814 default_file_start (void)
6816 if (targetm
.asm_file_start_app_off
6817 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
6818 fputs (ASM_APP_OFF
, asm_out_file
);
6820 if (targetm
.asm_file_start_file_directive
)
6821 output_file_directive (asm_out_file
, main_input_filename
);
6824 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6825 which emits a special section directive used to indicate whether or
6826 not this object file needs an executable stack. This is primarily
6827 a GNU extension to ELF but could be used on other targets. */
6829 int trampolines_created
;
6832 file_end_indicate_exec_stack (void)
6834 unsigned int flags
= SECTION_DEBUG
;
6835 if (trampolines_created
)
6836 flags
|= SECTION_CODE
;
6838 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
6841 /* Emit a special section directive to indicate that this object file
6842 was compiled with -fsplit-stack. This is used to let the linker
6843 detect calls between split-stack code and non-split-stack code, so
6844 that it can modify the split-stack code to allocate a sufficiently
6845 large stack. We emit another special section if there are any
6846 functions in this file which have the no_split_stack attribute, to
6847 prevent the linker from warning about being unable to convert the
6848 functions if they call non-split-stack code. */
6851 file_end_indicate_split_stack (void)
6853 if (flag_split_stack
)
6855 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
6857 if (saw_no_split_stack
)
6858 switch_to_section (get_section (".note.GNU-no-split-stack",
6859 SECTION_DEBUG
, NULL
));
6863 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6864 a get_unnamed_section callback. */
6867 output_section_asm_op (const void *directive
)
6869 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
6872 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6873 the current section is NEW_SECTION. */
6876 switch_to_section (section
*new_section
)
6878 if (in_section
== new_section
)
6881 if (new_section
->common
.flags
& SECTION_FORGET
)
6884 in_section
= new_section
;
6886 switch (SECTION_STYLE (new_section
))
6889 targetm
.asm_out
.named_section (new_section
->named
.name
,
6890 new_section
->named
.common
.flags
,
6891 new_section
->named
.decl
);
6894 case SECTION_UNNAMED
:
6895 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
6898 case SECTION_NOSWITCH
:
6903 new_section
->common
.flags
|= SECTION_DECLARED
;
6906 /* If block symbol SYMBOL has not yet been assigned an offset, place
6907 it at the end of its block. */
6910 place_block_symbol (rtx symbol
)
6912 unsigned HOST_WIDE_INT size
, mask
, offset
;
6913 struct constant_descriptor_rtx
*desc
;
6914 unsigned int alignment
;
6915 struct object_block
*block
;
6918 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
6919 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
6922 /* Work out the symbol's size and alignment. */
6923 if (CONSTANT_POOL_ADDRESS_P (symbol
))
6925 desc
= SYMBOL_REF_CONSTANT (symbol
);
6926 alignment
= desc
->align
;
6927 size
= GET_MODE_SIZE (desc
->mode
);
6929 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
6931 decl
= SYMBOL_REF_DECL (symbol
);
6932 alignment
= DECL_ALIGN (decl
);
6933 size
= get_constant_size (DECL_INITIAL (decl
));
6937 decl
= SYMBOL_REF_DECL (symbol
);
6938 alignment
= DECL_ALIGN (decl
);
6939 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
6940 if (flag_asan
&& asan_protect_global (decl
))
6941 size
+= asan_red_zone_size (size
);
6944 /* Calculate the object's offset from the start of the block. */
6945 block
= SYMBOL_REF_BLOCK (symbol
);
6946 mask
= alignment
/ BITS_PER_UNIT
- 1;
6947 offset
= (block
->size
+ mask
) & ~mask
;
6948 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
6950 /* Record the block's new alignment and size. */
6951 block
->alignment
= MAX (block
->alignment
, alignment
);
6952 block
->size
= offset
+ size
;
6954 vec_safe_push (block
->objects
, symbol
);
6957 /* Return the anchor that should be used to address byte offset OFFSET
6958 from the first object in BLOCK. MODEL is the TLS model used
6962 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
6963 enum tls_model model
)
6966 unsigned int begin
, middle
, end
;
6967 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
6970 /* Work out the anchor's offset. Use an offset of 0 for the first
6971 anchor so that we don't pessimize the case where we take the address
6972 of a variable at the beginning of the block. This is particularly
6973 useful when a block has only one variable assigned to it.
6975 We try to place anchors RANGE bytes apart, so there can then be
6976 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
6977 a ptr_mode offset. With some target settings, the lowest such
6978 anchor might be out of range for the lowest ptr_mode offset;
6979 likewise the highest anchor for the highest offset. Use anchors
6980 at the extreme ends of the ptr_mode range in such cases.
6982 All arithmetic uses unsigned integers in order to avoid
6984 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
6985 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
6986 range
= max_offset
- min_offset
+ 1;
6991 bias
= 1 << (GET_MODE_BITSIZE (ptr_mode
) - 1);
6994 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
6995 delta
-= delta
% range
;
6998 offset
= (HOST_WIDE_INT
) (-delta
);
7002 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7003 delta
-= delta
% range
;
7004 if (delta
> bias
- 1)
7006 offset
= (HOST_WIDE_INT
) delta
;
7010 /* Do a binary search to see if there's already an anchor we can use.
7011 Set BEGIN to the new anchor's index if not. */
7013 end
= vec_safe_length (block
->anchors
);
7014 while (begin
!= end
)
7016 middle
= (end
+ begin
) / 2;
7017 anchor
= (*block
->anchors
)[middle
];
7018 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7020 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7022 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7024 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7030 /* Create a new anchor with a unique label. */
7031 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7032 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7033 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7034 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7036 /* Insert it at index BEGIN. */
7037 vec_safe_insert (block
->anchors
, begin
, anchor
);
7041 /* Output the objects in BLOCK. */
7044 output_object_block (struct object_block
*block
)
7046 struct constant_descriptor_rtx
*desc
;
7048 HOST_WIDE_INT offset
;
7052 if (!block
->objects
)
7055 /* Switch to the section and make sure that the first byte is
7056 suitably aligned. */
7057 switch_to_section (block
->sect
);
7058 assemble_align (block
->alignment
);
7060 /* Define the values of all anchors relative to the current section
7062 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7063 targetm
.asm_out
.output_anchor (symbol
);
7065 /* Output the objects themselves. */
7067 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7069 /* Move to the object's offset, padding with zeros if necessary. */
7070 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7071 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7072 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7074 desc
= SYMBOL_REF_CONSTANT (symbol
);
7075 output_constant_pool_1 (desc
, 1);
7076 offset
+= GET_MODE_SIZE (desc
->mode
);
7078 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7080 decl
= SYMBOL_REF_DECL (symbol
);
7081 assemble_constant_contents (DECL_INITIAL (decl
), XSTR (symbol
, 0),
7083 offset
+= get_constant_size (DECL_INITIAL (decl
));
7087 decl
= SYMBOL_REF_DECL (symbol
);
7088 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7089 offset
+= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
7094 /* A htab_traverse callback used to call output_object_block for
7095 each member of object_block_htab. */
7098 output_object_block_htab (void **slot
, void *data ATTRIBUTE_UNUSED
)
7100 output_object_block ((struct object_block
*) (*slot
));
7104 /* Output the definitions of all object_blocks. */
7107 output_object_blocks (void)
7109 htab_traverse (object_block_htab
, output_object_block_htab
, NULL
);
7112 /* This function provides a possible implementation of the
7113 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7114 by -frecord-gcc-switches it creates a new mergeable, string section in the
7115 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7116 contains the switches in ASCII format.
7118 FIXME: This code does not correctly handle double quote characters
7119 that appear inside strings, (it strips them rather than preserving them).
7120 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7121 characters - instead it treats them as sub-string separators. Since
7122 we want to emit NUL strings terminators into the object file we have to use
7126 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7130 case SWITCH_TYPE_PASSED
:
7131 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7132 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7135 case SWITCH_TYPE_DESCRIPTIVE
:
7138 /* Distinguish between invocations where name is NULL. */
7139 static bool started
= false;
7145 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7149 | (SECTION_ENTSIZE
& 1),
7151 switch_to_section (sec
);
7160 /* The return value is currently ignored by the caller, but must be 0.
7161 For -fverbose-asm the return value would be the number of characters
7162 emitted into the assembler file. */
7166 /* Emit text to declare externally defined symbols. It is needed to
7167 properly support non-default visibility. */
7169 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7171 const char *name ATTRIBUTE_UNUSED
)
7173 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7174 set in order to avoid putting out names that are never really
7176 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7177 && targetm
.binds_local_p (decl
))
7178 maybe_assemble_visibility (decl
);
7181 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7184 default_asm_output_source_filename (FILE *file
, const char *name
)
7186 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7187 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7189 fprintf (file
, "\t.file\t");
7190 output_quoted_string (file
, name
);
7195 /* Output a file name in the form wanted by System V. */
7198 output_file_directive (FILE *asm_file
, const char *input_name
)
7203 if (input_name
== NULL
)
7204 input_name
= "<stdin>";
7206 input_name
= remap_debug_filename (input_name
);
7208 len
= strlen (input_name
);
7209 na
= input_name
+ len
;
7211 /* NA gets INPUT_NAME sans directory names. */
7212 while (na
> input_name
)
7214 if (IS_DIR_SEPARATOR (na
[-1]))
7219 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7222 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7225 make_debug_expr_from_rtl (const_rtx exp
)
7227 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7228 enum machine_mode mode
= GET_MODE (exp
);
7231 DECL_ARTIFICIAL (ddecl
) = 1;
7232 if (REG_P (exp
) && REG_EXPR (exp
))
7233 type
= TREE_TYPE (REG_EXPR (exp
));
7234 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7235 type
= TREE_TYPE (MEM_EXPR (exp
));
7238 if (type
&& TYPE_MODE (type
) == mode
)
7239 TREE_TYPE (ddecl
) = type
;
7241 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7242 DECL_MODE (ddecl
) = mode
;
7243 dval
= gen_rtx_DEBUG_EXPR (mode
);
7244 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7245 SET_DECL_RTL (ddecl
, dval
);
7249 #ifdef ELF_ASCII_ESCAPES
7250 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7253 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7258 fputs (STRING_ASM_OP
, f
);
7263 escape
= ELF_ASCII_ESCAPES
[c
];
7270 /* TODO: Print in hex with fast function, important for -flto. */
7271 fprintf (f
, "\\%03o", c
);
7284 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7287 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7289 const char *limit
= s
+ len
;
7290 const char *last_null
= NULL
;
7291 unsigned bytes_in_chunk
= 0;
7295 for (; s
< limit
; s
++)
7299 if (bytes_in_chunk
>= 60)
7308 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7315 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7317 if (bytes_in_chunk
> 0)
7324 default_elf_asm_output_limited_string (f
, s
);
7329 if (bytes_in_chunk
== 0)
7330 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7333 escape
= ELF_ASCII_ESCAPES
[c
];
7341 /* TODO: Print in hex with fast function, important for -flto. */
7342 fprintf (f
, "\\%03o", c
);
7343 bytes_in_chunk
+= 4;
7348 bytes_in_chunk
+= 2;
7355 if (bytes_in_chunk
> 0)
7363 static GTY(()) section
*elf_init_array_section
;
7364 static GTY(()) section
*elf_fini_array_section
;
7367 get_elf_initfini_array_priority_section (int priority
,
7371 if (priority
!= DEFAULT_INIT_PRIORITY
)
7374 sprintf (buf
, "%s.%.5u",
7375 constructor_p
? ".init_array" : ".fini_array",
7377 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7383 if (elf_init_array_section
== NULL
)
7384 elf_init_array_section
7385 = get_section (".init_array",
7386 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7387 sec
= elf_init_array_section
;
7391 if (elf_fini_array_section
== NULL
)
7392 elf_fini_array_section
7393 = get_section (".fini_array",
7394 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7395 sec
= elf_fini_array_section
;
7401 /* Use .init_array section for constructors. */
7404 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7406 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7408 assemble_addr_to_section (symbol
, sec
);
7411 /* Use .fini_array section for destructors. */
7414 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7416 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7418 assemble_addr_to_section (symbol
, sec
);
7421 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7423 This is a bit of a cheat. The real default is a no-op, but this
7424 hook is the default for all targets with a .ident directive. */
7427 default_asm_output_ident_directive (const char *ident_str
)
7429 const char *ident_asm_op
= "\t.ident\t";
7431 /* If we are still in the front end, do not write out the string
7432 to asm_out_file. Instead, add a fake top-level asm statement.
7433 This allows the front ends to use this hook without actually
7434 writing to asm_out_file, to handle #ident or Pragma Ident. */
7435 if (cgraph_state
== CGRAPH_STATE_PARSING
)
7437 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7438 add_asm_node (build_string (strlen (buf
), buf
));
7441 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7444 #include "gt-varasm.h"