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
4 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 2, 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 COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
24 /* This file handles generation of all the assembler code
25 *except* the instructions of a function.
26 This includes declarations of variables and their initial values.
28 We also output the assembler code for constants stored in memory
29 and are responsible for combining constants with the same value. */
33 #include "coretypes.h"
40 #include "hard-reg-set.h"
48 #include "langhooks.h"
52 #include "tree-mudflap.h"
54 #include "cfglayout.h"
55 #include "basic-block.h"
56 #include "tree-iterator.h"
58 #ifdef XCOFF_DEBUGGING_INFO
59 #include "xcoffout.h" /* Needed for external data
60 declarations for e.g. AIX 4.x. */
63 /* The (assembler) name of the first globally-visible object output. */
64 extern GTY(()) const char *first_global_object_name
;
65 extern GTY(()) const char *weak_global_object_name
;
67 const char *first_global_object_name
;
68 const char *weak_global_object_name
;
71 struct constant_descriptor_rtx
;
72 struct rtx_constant_pool
;
74 struct varasm_status
GTY(())
76 /* If we're using a per-function constant pool, this is it. */
77 struct rtx_constant_pool
*pool
;
79 /* Number of tree-constants deferred during the expansion of this
81 unsigned int deferred_constants
;
84 #define n_deferred_constants (cfun->varasm->deferred_constants)
86 /* Number for making the label on the next
87 constant that is stored in memory. */
89 static GTY(()) int const_labelno
;
91 /* Carry information from ASM_DECLARE_OBJECT_NAME
92 to ASM_FINISH_DECLARE_OBJECT. */
94 int size_directive_output
;
96 /* The last decl for which assemble_variable was called,
97 if it did ASM_DECLARE_OBJECT_NAME.
98 If the last call to assemble_variable didn't do that,
101 tree last_assemble_variable_decl
;
103 /* The following global variable indicates if the first basic block
104 in a function belongs to the cold partition or not. */
106 bool first_function_block_is_cold
;
108 /* We give all constants their own alias set. Perhaps redundant with
109 MEM_READONLY_P, but pre-dates it. */
111 static HOST_WIDE_INT const_alias_set
;
113 static const char *strip_reg_name (const char *);
114 static int contains_pointers_p (tree
);
115 #ifdef ASM_OUTPUT_EXTERNAL
116 static bool incorporeal_function_p (tree
);
118 static void decode_addr_const (tree
, struct addr_const
*);
119 static hashval_t
const_desc_hash (const void *);
120 static int const_desc_eq (const void *, const void *);
121 static hashval_t
const_hash_1 (const tree
);
122 static int compare_constant (const tree
, const tree
);
123 static tree
copy_constant (tree
);
124 static void output_constant_def_contents (rtx
);
125 static void output_addressed_constants (tree
);
126 static unsigned HOST_WIDE_INT
array_size_for_constructor (tree
);
127 static unsigned min_align (unsigned, unsigned);
128 static void output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int);
129 static void globalize_decl (tree
);
130 #ifdef BSS_SECTION_ASM_OP
131 #ifdef ASM_OUTPUT_BSS
132 static void asm_output_bss (FILE *, tree
, const char *,
133 unsigned HOST_WIDE_INT
, unsigned HOST_WIDE_INT
);
135 #ifdef ASM_OUTPUT_ALIGNED_BSS
136 static void asm_output_aligned_bss (FILE *, tree
, const char *,
137 unsigned HOST_WIDE_INT
, int)
140 #endif /* BSS_SECTION_ASM_OP */
141 static void mark_weak (tree
);
142 static void output_constant_pool (const char *, tree
);
144 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
145 section
*text_section
;
146 section
*data_section
;
147 section
*readonly_data_section
;
148 section
*sdata_section
;
149 section
*ctors_section
;
150 section
*dtors_section
;
151 section
*bss_section
;
152 section
*sbss_section
;
154 /* Various forms of common section. All are guaranteed to be nonnull. */
155 section
*tls_comm_section
;
156 section
*comm_section
;
157 section
*lcomm_section
;
159 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
161 section
*bss_noswitch_section
;
163 /* The section that holds the main exception table, when known. The section
164 is set either by the target's init_sections hook or by the first call to
165 switch_to_exception_section. */
166 section
*exception_section
;
168 /* The section that holds the DWARF2 frame unwind information, when known.
169 The section is set either by the target's init_sections hook or by the
170 first call to switch_to_eh_frame_section. */
171 section
*eh_frame_section
;
173 /* asm_out_file's current section. This is NULL if no section has yet
174 been selected or if we lose track of what the current section is. */
177 /* True if code for the current function is currently being directed
178 at the cold section. */
179 bool in_cold_section_p
;
181 /* A linked list of all the unnamed sections. */
182 static GTY(()) section
*unnamed_sections
;
184 /* Return a nonzero value if DECL has a section attribute. */
185 #ifndef IN_NAMED_SECTION
186 #define IN_NAMED_SECTION(DECL) \
187 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
188 && DECL_SECTION_NAME (DECL) != NULL_TREE)
191 /* Hash table of named sections. */
192 static GTY((param_is (section
))) htab_t section_htab
;
194 /* A table of object_blocks, indexed by section. */
195 static GTY((param_is (struct object_block
))) htab_t object_block_htab
;
197 /* The next number to use for internal anchor labels. */
198 static GTY(()) int anchor_labelno
;
200 /* A pool of constants that can be shared between functions. */
201 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
205 static GTY ((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
207 static GTY (()) tree emutls_object_type
;
209 #ifndef NO_DOT_IN_LABEL
210 # define EMUTLS_VAR_PREFIX "__emutls_v."
211 # define EMUTLS_TMPL_PREFIX "__emutls_t."
212 #elif !defined NO_DOLLAR_IN_LABEL
213 # define EMUTLS_VAR_PREFIX "__emutls_v$"
214 # define EMUTLS_TMPL_PREFIX "__emutls_t$"
216 # define EMUTLS_VAR_PREFIX "__emutls_v_"
217 # define EMUTLS_TMPL_PREFIX "__emutls_t_"
220 /* Create an identifier for the struct __emutls_object, given an identifier
221 of the DECL_ASSEMBLY_NAME of the original object. */
224 get_emutls_object_name (tree name
)
226 char *toname
= alloca (strlen (IDENTIFIER_POINTER (name
))
227 + sizeof (EMUTLS_VAR_PREFIX
));
228 strcpy (toname
, EMUTLS_VAR_PREFIX
);
229 strcpy (toname
+ sizeof (EMUTLS_VAR_PREFIX
) - 1, IDENTIFIER_POINTER (name
));
231 return get_identifier (toname
);
234 /* Create the structure for struct __emutls_object. This should match the
235 structure at the top of emutls.c, modulo the union there. */
238 get_emutls_object_type (void)
240 tree type
, type_name
, field
, next_field
, word_type_node
;
242 type
= emutls_object_type
;
246 emutls_object_type
= type
= lang_hooks
.types
.make_type (RECORD_TYPE
);
247 type_name
= get_identifier ("__emutls_object");
248 type_name
= build_decl (TYPE_DECL
, type_name
, type
);
249 TYPE_NAME (type
) = type_name
;
251 field
= build_decl (FIELD_DECL
, get_identifier ("__templ"), ptr_type_node
);
252 DECL_CONTEXT (field
) = type
;
255 field
= build_decl (FIELD_DECL
, get_identifier ("__offset"), ptr_type_node
);
256 DECL_CONTEXT (field
) = type
;
257 TREE_CHAIN (field
) = next_field
;
260 word_type_node
= lang_hooks
.types
.type_for_mode (word_mode
, 1);
261 field
= build_decl (FIELD_DECL
, get_identifier ("__align"), word_type_node
);
262 DECL_CONTEXT (field
) = type
;
263 TREE_CHAIN (field
) = next_field
;
266 field
= build_decl (FIELD_DECL
, get_identifier ("__size"), word_type_node
);
267 DECL_CONTEXT (field
) = type
;
268 TREE_CHAIN (field
) = next_field
;
270 TYPE_FIELDS (type
) = field
;
276 /* Create a read-only variable like DECL, with the same DECL_INITIAL.
277 This will be used for initializing the emulated tls data area. */
280 get_emutls_init_templ_addr (tree decl
)
285 if (!DECL_INITIAL (decl
))
286 return null_pointer_node
;
288 name
= DECL_ASSEMBLER_NAME (decl
);
289 toname
= alloca (strlen (IDENTIFIER_POINTER (name
))
290 + sizeof (EMUTLS_TMPL_PREFIX
));
291 strcpy (toname
, EMUTLS_TMPL_PREFIX
);
292 strcpy (toname
+ sizeof (EMUTLS_TMPL_PREFIX
) - 1, IDENTIFIER_POINTER (name
));
293 name
= get_identifier (toname
);
295 to
= build_decl (VAR_DECL
, name
, TREE_TYPE (decl
));
296 SET_DECL_ASSEMBLER_NAME (to
, DECL_NAME (to
));
298 DECL_ARTIFICIAL (to
) = 1;
299 TREE_USED (to
) = TREE_USED (decl
);
300 TREE_READONLY (to
) = 1;
301 DECL_IGNORED_P (to
) = 1;
302 DECL_CONTEXT (to
) = DECL_CONTEXT (decl
);
303 DECL_WEAK (to
) = DECL_WEAK (decl
);
304 if (DECL_ONE_ONLY (decl
))
306 make_decl_one_only (to
);
307 TREE_STATIC (to
) = TREE_STATIC (decl
);
308 TREE_PUBLIC (to
) = TREE_PUBLIC (decl
);
309 DECL_VISIBILITY (to
) = DECL_VISIBILITY (decl
);
312 TREE_STATIC (to
) = 1;
314 DECL_INITIAL (to
) = DECL_INITIAL (decl
);
315 DECL_INITIAL (decl
) = NULL
;
317 varpool_finalize_decl (to
);
318 return build_fold_addr_expr (to
);
321 /* When emulating tls, we use a control structure for use by the runtime.
322 Create and return this structure. */
325 emutls_decl (tree decl
)
328 struct tree_map
*h
, in
;
331 if (targetm
.have_tls
|| decl
== NULL
|| decl
== error_mark_node
332 || TREE_CODE (decl
) != VAR_DECL
|| ! DECL_THREAD_LOCAL_P (decl
))
335 /* Look up the object in the hash; return the control structure if
336 it has already been created. */
338 emutls_htab
= htab_create_ggc (512, tree_map_hash
, tree_map_eq
, 0);
340 name
= DECL_ASSEMBLER_NAME (decl
);
342 /* Note that we use the hash of the decl's name, rather than a hash
343 of the decl's pointer. In emutls_finish we iterate through the
344 hash table, and we want this traversal to be predictable. */
345 in
.hash
= htab_hash_string (IDENTIFIER_POINTER (name
));
347 loc
= htab_find_slot_with_hash (emutls_htab
, &in
, in
.hash
, INSERT
);
353 to
= build_decl (VAR_DECL
, get_emutls_object_name (name
),
354 get_emutls_object_type ());
356 h
= ggc_alloc (sizeof (struct tree_map
));
360 *(struct tree_map
**) loc
= h
;
362 DECL_ARTIFICIAL (to
) = 1;
363 DECL_IGNORED_P (to
) = 1;
364 TREE_READONLY (to
) = 0;
366 SET_DECL_ASSEMBLER_NAME (to
, DECL_NAME (to
));
367 if (DECL_ONE_ONLY (decl
))
368 make_decl_one_only (to
);
369 DECL_CONTEXT (to
) = DECL_CONTEXT (decl
);
372 /* Note that these fields may need to be updated from time to time from
373 the original decl. Consider:
374 extern __thread int i;
375 int foo() { return i; }
377 in which I goes from external to locally defined and initialized. */
379 TREE_STATIC (to
) = TREE_STATIC (decl
);
380 TREE_USED (to
) = TREE_USED (decl
);
381 TREE_PUBLIC (to
) = TREE_PUBLIC (decl
);
382 DECL_EXTERNAL (to
) = DECL_EXTERNAL (decl
);
383 DECL_COMMON (to
) = DECL_COMMON (decl
);
384 DECL_WEAK (to
) = DECL_WEAK (decl
);
385 DECL_VISIBILITY (to
) = DECL_VISIBILITY (decl
);
391 emutls_common_1 (void **loc
, void *xstmts
)
393 struct tree_map
*h
= *(struct tree_map
**) loc
;
394 tree args
, x
, *pstmts
= (tree
*) xstmts
;
397 if (! DECL_COMMON (h
->base
.from
)
398 || (DECL_INITIAL (h
->base
.from
)
399 && DECL_INITIAL (h
->base
.from
) != error_mark_node
))
402 word_type_node
= lang_hooks
.types
.type_for_mode (word_mode
, 1);
404 /* The idea was to call get_emutls_init_templ_addr here, but if we
405 do this and there is an initializer, -fanchor_section loses,
406 because it would be too late to ensure the template is
408 x
= null_pointer_node
;
409 args
= tree_cons (NULL
, x
, NULL
);
410 x
= build_int_cst (word_type_node
, DECL_ALIGN_UNIT (h
->base
.from
));
411 args
= tree_cons (NULL
, x
, args
);
412 x
= fold_convert (word_type_node
, DECL_SIZE_UNIT (h
->base
.from
));
413 args
= tree_cons (NULL
, x
, args
);
414 x
= build_fold_addr_expr (h
->to
);
415 args
= tree_cons (NULL
, x
, args
);
417 x
= built_in_decls
[BUILT_IN_EMUTLS_REGISTER_COMMON
];
418 x
= build_function_call_expr (x
, args
);
420 append_to_statement_list (x
, pstmts
);
427 tree body
= NULL_TREE
;
429 if (emutls_htab
== NULL
)
432 htab_traverse_noresize (emutls_htab
, emutls_common_1
, &body
);
433 if (body
== NULL_TREE
)
436 cgraph_build_static_cdtor ('I', body
, DEFAULT_INIT_PRIORITY
);
439 /* Helper routines for maintaining section_htab. */
442 section_entry_eq (const void *p1
, const void *p2
)
444 const section
*old
= p1
;
445 const char *new = p2
;
447 return strcmp (old
->named
.name
, new) == 0;
451 section_entry_hash (const void *p
)
453 const section
*old
= p
;
454 return htab_hash_string (old
->named
.name
);
457 /* Return a hash value for section SECT. */
460 hash_section (section
*sect
)
462 if (sect
->common
.flags
& SECTION_NAMED
)
463 return htab_hash_string (sect
->named
.name
);
464 return sect
->common
.flags
;
467 /* Helper routines for maintaining object_block_htab. */
470 object_block_entry_eq (const void *p1
, const void *p2
)
472 const struct object_block
*old
= p1
;
473 const section
*new = p2
;
475 return old
->sect
== new;
479 object_block_entry_hash (const void *p
)
481 const struct object_block
*old
= p
;
482 return hash_section (old
->sect
);
485 /* Return a new unnamed section with the given fields. */
488 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
493 sect
= ggc_alloc (sizeof (struct unnamed_section
));
494 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
495 sect
->unnamed
.callback
= callback
;
496 sect
->unnamed
.data
= data
;
497 sect
->unnamed
.next
= unnamed_sections
;
499 unnamed_sections
= sect
;
503 /* Return a SECTION_NOSWITCH section with the given fields. */
506 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
510 sect
= ggc_alloc (sizeof (struct unnamed_section
));
511 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
512 sect
->noswitch
.callback
= callback
;
517 /* Return the named section structure associated with NAME. Create
518 a new section with the given fields if no such structure exists. */
521 get_section (const char *name
, unsigned int flags
, tree decl
)
523 section
*sect
, **slot
;
526 htab_find_slot_with_hash (section_htab
, name
,
527 htab_hash_string (name
), INSERT
);
528 flags
|= SECTION_NAMED
;
531 sect
= ggc_alloc (sizeof (struct named_section
));
532 sect
->named
.common
.flags
= flags
;
533 sect
->named
.name
= ggc_strdup (name
);
534 sect
->named
.decl
= decl
;
540 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
541 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
543 /* Sanity check user variables for flag changes. */
545 decl
= sect
->named
.decl
;
547 error ("%+D causes a section type conflict", decl
);
553 /* Return true if the current compilation mode benefits from having
554 objects grouped into blocks. */
557 use_object_blocks_p (void)
559 return flag_section_anchors
;
562 /* Return the object_block structure for section SECT. Create a new
563 structure if we haven't created one already. Return null if SECT
566 static struct object_block
*
567 get_block_for_section (section
*sect
)
569 struct object_block
*block
;
575 slot
= htab_find_slot_with_hash (object_block_htab
, sect
,
576 hash_section (sect
), INSERT
);
577 block
= (struct object_block
*) *slot
;
580 block
= (struct object_block
*)
581 ggc_alloc_cleared (sizeof (struct object_block
));
588 /* Create a symbol with label LABEL and place it at byte offset
589 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
590 is not yet known. LABEL must be a garbage-collected string. */
593 create_block_symbol (const char *label
, struct object_block
*block
,
594 HOST_WIDE_INT offset
)
599 /* Create the extended SYMBOL_REF. */
600 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
601 symbol
= ggc_alloc_zone (size
, &rtl_zone
);
603 /* Initialize the normal SYMBOL_REF fields. */
604 memset (symbol
, 0, size
);
605 PUT_CODE (symbol
, SYMBOL_REF
);
606 PUT_MODE (symbol
, Pmode
);
607 XSTR (symbol
, 0) = label
;
608 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
610 /* Initialize the block_symbol stuff. */
611 SYMBOL_REF_BLOCK (symbol
) = block
;
612 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
618 initialize_cold_section_name (void)
620 const char *stripped_name
;
624 gcc_assert (cfun
&& current_function_decl
);
625 if (cfun
->unlikely_text_section_name
)
628 dsn
= DECL_SECTION_NAME (current_function_decl
);
629 if (flag_function_sections
&& dsn
)
631 name
= alloca (TREE_STRING_LENGTH (dsn
) + 1);
632 memcpy (name
, TREE_STRING_POINTER (dsn
), TREE_STRING_LENGTH (dsn
) + 1);
634 stripped_name
= targetm
.strip_name_encoding (name
);
636 buffer
= ACONCAT ((stripped_name
, "_unlikely", NULL
));
637 cfun
->unlikely_text_section_name
= ggc_strdup (buffer
);
640 cfun
->unlikely_text_section_name
= UNLIKELY_EXECUTED_TEXT_SECTION_NAME
;
643 /* Tell assembler to switch to unlikely-to-be-executed text section. */
646 unlikely_text_section (void)
650 if (!cfun
->unlikely_text_section_name
)
651 initialize_cold_section_name ();
653 return get_named_section (NULL
, cfun
->unlikely_text_section_name
, 0);
656 return get_named_section (NULL
, UNLIKELY_EXECUTED_TEXT_SECTION_NAME
, 0);
659 /* When called within a function context, return true if the function
660 has been assigned a cold text section and if SECT is that section.
661 When called outside a function context, return true if SECT is the
662 default cold section. */
665 unlikely_text_section_p (section
*sect
)
670 name
= cfun
->unlikely_text_section_name
;
672 name
= UNLIKELY_EXECUTED_TEXT_SECTION_NAME
;
676 && SECTION_STYLE (sect
) == SECTION_NAMED
677 && strcmp (name
, sect
->named
.name
) == 0);
680 /* Return a section with a particular name and with whatever SECTION_*
681 flags section_type_flags deems appropriate. The name of the section
682 is taken from NAME if nonnull, otherwise it is taken from DECL's
683 DECL_SECTION_NAME. DECL is the decl associated with the section
684 (see the section comment for details) and RELOC is as for
685 section_type_flags. */
688 get_named_section (tree decl
, const char *name
, int reloc
)
692 gcc_assert (!decl
|| DECL_P (decl
));
694 name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
696 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
698 return get_section (name
, flags
, decl
);
701 /* If required, set DECL_SECTION_NAME to a unique name. */
704 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
705 int flag_function_or_data_sections
)
707 if (DECL_SECTION_NAME (decl
) == NULL_TREE
708 && targetm
.have_named_sections
709 && (flag_function_or_data_sections
710 || DECL_ONE_ONLY (decl
)))
711 targetm
.asm_out
.unique_section (decl
, reloc
);
714 #ifdef BSS_SECTION_ASM_OP
716 #ifdef ASM_OUTPUT_BSS
718 /* Utility function for ASM_OUTPUT_BSS for targets to use if
719 they don't support alignments in .bss.
720 ??? It is believed that this function will work in most cases so such
721 support is localized here. */
724 asm_output_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
726 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
727 unsigned HOST_WIDE_INT rounded
)
729 gcc_assert (strcmp (XSTR (XEXP (DECL_RTL (decl
), 0), 0), name
) == 0);
730 targetm
.asm_out
.globalize_decl_name (file
, decl
);
731 switch_to_section (bss_section
);
732 #ifdef ASM_DECLARE_OBJECT_NAME
733 last_assemble_variable_decl
= decl
;
734 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
736 /* Standard thing is just output label for the object. */
737 ASM_OUTPUT_LABEL (file
, name
);
738 #endif /* ASM_DECLARE_OBJECT_NAME */
739 ASM_OUTPUT_SKIP (file
, rounded
? rounded
: 1);
744 #ifdef ASM_OUTPUT_ALIGNED_BSS
746 /* Utility function for targets to use in implementing
747 ASM_OUTPUT_ALIGNED_BSS.
748 ??? It is believed that this function will work in most cases so such
749 support is localized here. */
752 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
753 const char *name
, unsigned HOST_WIDE_INT size
,
756 switch_to_section (bss_section
);
757 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
758 #ifdef ASM_DECLARE_OBJECT_NAME
759 last_assemble_variable_decl
= decl
;
760 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
762 /* Standard thing is just output label for the object. */
763 ASM_OUTPUT_LABEL (file
, name
);
764 #endif /* ASM_DECLARE_OBJECT_NAME */
765 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
770 #endif /* BSS_SECTION_ASM_OP */
772 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
773 /* Return the hot section for function DECL. Return text_section for
777 hot_function_section (tree decl
)
779 if (decl
!= NULL_TREE
780 && DECL_SECTION_NAME (decl
) != NULL_TREE
781 && targetm
.have_named_sections
)
782 return get_named_section (decl
, NULL
, 0);
788 /* Return the section for function DECL.
790 If DECL is NULL_TREE, return the text section. We can be passed
791 NULL_TREE under some circumstances by dbxout.c at least. */
794 function_section (tree decl
)
798 if (first_function_block_is_cold
)
801 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
802 if (decl
!= NULL_TREE
803 && DECL_SECTION_NAME (decl
) != NULL_TREE
)
804 return reloc
? unlikely_text_section ()
805 : get_named_section (decl
, NULL
, 0);
807 return targetm
.asm_out
.select_section (decl
, reloc
, DECL_ALIGN (decl
));
809 return reloc
? unlikely_text_section () : hot_function_section (decl
);
814 current_function_section (void)
816 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
817 if (current_function_decl
!= NULL_TREE
818 && DECL_SECTION_NAME (current_function_decl
) != NULL_TREE
)
819 return in_cold_section_p
? unlikely_text_section ()
820 : get_named_section (current_function_decl
,
823 return targetm
.asm_out
.select_section (current_function_decl
,
825 DECL_ALIGN (current_function_decl
));
827 return (in_cold_section_p
828 ? unlikely_text_section ()
829 : hot_function_section (current_function_decl
));
833 /* Return the read-only data section associated with function DECL. */
836 default_function_rodata_section (tree decl
)
838 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
840 const char *name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
842 if (DECL_ONE_ONLY (decl
) && HAVE_COMDAT_GROUP
)
844 size_t len
= strlen (name
) + 3;
845 char* rname
= alloca (len
);
847 strcpy (rname
, ".rodata");
848 strcat (rname
, name
+ 5);
849 return get_section (rname
, SECTION_LINKONCE
, decl
);
851 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
852 else if (DECL_ONE_ONLY (decl
)
853 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
855 size_t len
= strlen (name
) + 1;
856 char *rname
= alloca (len
);
858 memcpy (rname
, name
, len
);
860 return get_section (rname
, SECTION_LINKONCE
, decl
);
862 /* For .text.foo we want to use .rodata.foo. */
863 else if (flag_function_sections
&& flag_data_sections
864 && strncmp (name
, ".text.", 6) == 0)
866 size_t len
= strlen (name
) + 1;
867 char *rname
= alloca (len
+ 2);
869 memcpy (rname
, ".rodata", 7);
870 memcpy (rname
+ 7, name
+ 5, len
- 5);
871 return get_section (rname
, 0, decl
);
875 return readonly_data_section
;
878 /* Return the read-only data section associated with function DECL
879 for targets where that section should be always the single
880 readonly data section. */
883 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
885 return readonly_data_section
;
888 /* Return the section to use for string merging. */
891 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
892 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
893 unsigned int flags ATTRIBUTE_UNUSED
)
897 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
898 && TREE_CODE (decl
) == STRING_CST
899 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
901 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
902 && TREE_STRING_LENGTH (decl
) >= len
)
904 enum machine_mode mode
;
905 unsigned int modesize
;
911 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
912 modesize
= GET_MODE_BITSIZE (mode
);
913 if (modesize
>= 8 && modesize
<= 256
914 && (modesize
& (modesize
- 1)) == 0)
916 if (align
< modesize
)
919 str
= TREE_STRING_POINTER (decl
);
920 unit
= GET_MODE_SIZE (mode
);
922 /* Check for embedded NUL characters. */
923 for (i
= 0; i
< len
; i
+= unit
)
925 for (j
= 0; j
< unit
; j
++)
926 if (str
[i
+ j
] != '\0')
933 sprintf (name
, ".rodata.str%d.%d", modesize
/ 8,
935 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
936 return get_section (name
, flags
, NULL
);
941 return readonly_data_section
;
944 /* Return the section to use for constant merging. */
947 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
948 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
949 unsigned int flags ATTRIBUTE_UNUSED
)
951 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
953 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
959 && (align
& (align
- 1)) == 0)
963 sprintf (name
, ".rodata.cst%d", (int) (align
/ 8));
964 flags
|= (align
/ 8) | SECTION_MERGE
;
965 return get_section (name
, flags
, NULL
);
967 return readonly_data_section
;
970 /* Given NAME, a putative register name, discard any customary prefixes. */
973 strip_reg_name (const char *name
)
975 #ifdef REGISTER_PREFIX
976 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
977 name
+= strlen (REGISTER_PREFIX
);
979 if (name
[0] == '%' || name
[0] == '#')
984 /* The user has asked for a DECL to have a particular name. Set (or
985 change) it in such a way that we don't prefix an underscore to
988 set_user_assembler_name (tree decl
, const char *name
)
990 char *starred
= alloca (strlen (name
) + 2);
992 strcpy (starred
+ 1, name
);
993 change_decl_assembler_name (decl
, get_identifier (starred
));
994 SET_DECL_RTL (decl
, NULL_RTX
);
997 /* Decode an `asm' spec for a declaration as a register name.
998 Return the register number, or -1 if nothing specified,
999 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
1000 or -3 if ASMSPEC is `cc' and is not recognized,
1001 or -4 if ASMSPEC is `memory' and is not recognized.
1002 Accept an exact spelling or a decimal number.
1003 Prefixes such as % are optional. */
1006 decode_reg_name (const char *asmspec
)
1012 /* Get rid of confusing prefixes. */
1013 asmspec
= strip_reg_name (asmspec
);
1015 /* Allow a decimal number as a "register name". */
1016 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
1017 if (! ISDIGIT (asmspec
[i
]))
1019 if (asmspec
[0] != 0 && i
< 0)
1022 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0)
1028 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
1030 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
1033 #ifdef ADDITIONAL_REGISTER_NAMES
1035 static const struct { const char *const name
; const int number
; } table
[]
1036 = ADDITIONAL_REGISTER_NAMES
;
1038 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
1039 if (table
[i
].name
[0]
1040 && ! strcmp (asmspec
, table
[i
].name
))
1041 return table
[i
].number
;
1043 #endif /* ADDITIONAL_REGISTER_NAMES */
1045 if (!strcmp (asmspec
, "memory"))
1048 if (!strcmp (asmspec
, "cc"))
1057 /* Return true if DECL's initializer is suitable for a BSS section. */
1060 bss_initializer_p (tree decl
)
1062 return (DECL_INITIAL (decl
) == NULL
1063 || DECL_INITIAL (decl
) == error_mark_node
1064 || (flag_zero_initialized_in_bss
1065 /* Leave constant zeroes in .rodata so they
1067 && !TREE_READONLY (decl
)
1068 && initializer_zerop (DECL_INITIAL (decl
))));
1071 /* Compute the alignment of variable specified by DECL.
1072 DONT_OUTPUT_DATA is from assemble_variable. */
1075 align_variable (tree decl
, bool dont_output_data
)
1077 unsigned int align
= DECL_ALIGN (decl
);
1079 /* In the case for initialing an array whose length isn't specified,
1080 where we have not yet been able to do the layout,
1081 figure out the proper alignment now. */
1082 if (dont_output_data
&& DECL_SIZE (decl
) == 0
1083 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
1084 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
1086 /* Some object file formats have a maximum alignment which they support.
1087 In particular, a.out format supports a maximum alignment of 4. */
1088 if (align
> MAX_OFILE_ALIGNMENT
)
1090 warning (0, "alignment of %q+D is greater than maximum object "
1091 "file alignment. Using %d", decl
,
1092 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
1093 align
= MAX_OFILE_ALIGNMENT
;
1096 /* On some machines, it is good to increase alignment sometimes. */
1097 if (! DECL_USER_ALIGN (decl
))
1099 #ifdef DATA_ALIGNMENT
1100 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1101 /* Don't increase alignment too much for TLS variables - TLS space
1103 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1106 #ifdef CONSTANT_ALIGNMENT
1107 if (DECL_INITIAL (decl
) != 0 && DECL_INITIAL (decl
) != error_mark_node
)
1109 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
1111 /* Don't increase alignment too much for TLS variables - TLS space
1113 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1114 align
= const_align
;
1119 /* Reset the alignment in case we have made it tighter, so we can benefit
1120 from it in get_pointer_alignment. */
1121 DECL_ALIGN (decl
) = align
;
1124 /* Return the section into which the given VAR_DECL or CONST_DECL
1125 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1126 section should be used wherever possible. */
1129 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1133 /* If the decl has been given an explicit section name, then it
1134 isn't common, and shouldn't be handled as such. */
1135 if (DECL_COMMON (decl
) && DECL_SECTION_NAME (decl
) == NULL
)
1137 if (DECL_THREAD_LOCAL_P (decl
))
1138 return tls_comm_section
;
1139 if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1140 return comm_section
;
1143 if (DECL_INITIAL (decl
) == error_mark_node
)
1144 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1145 else if (DECL_INITIAL (decl
))
1146 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1150 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1151 if (IN_NAMED_SECTION (decl
))
1152 return get_named_section (decl
, NULL
, reloc
);
1154 if (!DECL_THREAD_LOCAL_P (decl
)
1155 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1156 && bss_initializer_p (decl
))
1158 if (!TREE_PUBLIC (decl
))
1159 return lcomm_section
;
1160 if (bss_noswitch_section
)
1161 return bss_noswitch_section
;
1164 return targetm
.asm_out
.select_section (decl
, reloc
, DECL_ALIGN (decl
));
1167 /* Return the block into which object_block DECL should be placed. */
1169 static struct object_block
*
1170 get_block_for_decl (tree decl
)
1174 if (TREE_CODE (decl
) == VAR_DECL
)
1176 /* The object must be defined in this translation unit. */
1177 if (DECL_EXTERNAL (decl
))
1180 /* There's no point using object blocks for something that is
1181 isolated by definition. */
1182 if (DECL_ONE_ONLY (decl
))
1186 /* We can only calculate block offsets if the decl has a known
1188 if (DECL_SIZE_UNIT (decl
) == NULL
)
1190 if (!host_integerp (DECL_SIZE_UNIT (decl
), 1))
1193 /* Find out which section should contain DECL. We cannot put it into
1194 an object block if it requires a standalone definition. */
1195 if (TREE_CODE (decl
) == VAR_DECL
)
1196 align_variable (decl
, 0);
1197 sect
= get_variable_section (decl
, true);
1198 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1201 return get_block_for_section (sect
);
1204 /* Make sure block symbol SYMBOL is in block BLOCK. */
1207 change_symbol_block (rtx symbol
, struct object_block
*block
)
1209 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1211 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1212 SYMBOL_REF_BLOCK (symbol
) = block
;
1216 /* Return true if it is possible to put DECL in an object_block. */
1219 use_blocks_for_decl_p (tree decl
)
1221 /* Only data DECLs can be placed into object blocks. */
1222 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1225 /* Detect decls created by dw2_force_const_mem. Such decls are
1226 special because DECL_INITIAL doesn't specify the decl's true value.
1227 dw2_output_indirect_constants will instead call assemble_variable
1228 with dont_output_data set to 1 and then print the contents itself. */
1229 if (DECL_INITIAL (decl
) == decl
)
1232 /* If this decl is an alias, then we don't want to emit a definition. */
1233 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)))
1239 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1240 have static storage duration. In other words, it should not be an
1241 automatic variable, including PARM_DECLs.
1243 There is, however, one exception: this function handles variables
1244 explicitly placed in a particular register by the user.
1246 This is never called for PARM_DECL nodes. */
1249 make_decl_rtl (tree decl
)
1251 const char *name
= 0;
1255 /* Check that we are not being given an automatic variable. */
1256 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1257 && TREE_CODE (decl
) != RESULT_DECL
);
1259 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1260 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1261 || TREE_STATIC (decl
)
1262 || TREE_PUBLIC (decl
)
1263 || DECL_EXTERNAL (decl
)
1264 || DECL_REGISTER (decl
));
1266 /* And that we were not given a type or a label. */
1267 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1268 && TREE_CODE (decl
) != LABEL_DECL
);
1270 /* For a duplicate declaration, we can be called twice on the
1271 same DECL node. Don't discard the RTL already made. */
1272 if (DECL_RTL_SET_P (decl
))
1274 /* If the old RTL had the wrong mode, fix the mode. */
1275 x
= DECL_RTL (decl
);
1276 if (GET_MODE (x
) != DECL_MODE (decl
))
1277 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1279 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1282 /* ??? Another way to do this would be to maintain a hashed
1283 table of such critters. Instead of adding stuff to a DECL
1284 to give certain attributes to it, we could use an external
1285 hash map from DECL to set of attributes. */
1287 /* Let the target reassign the RTL if it wants.
1288 This is necessary, for example, when one machine specific
1289 decl attribute overrides another. */
1290 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1292 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1293 on the new decl information. */
1295 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1296 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1297 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1299 /* Make this function static known to the mudflap runtime. */
1300 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1301 mudflap_enqueue_decl (decl
);
1306 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
1308 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1309 && DECL_REGISTER (decl
))
1311 error ("register name not specified for %q+D", decl
);
1313 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1315 const char *asmspec
= name
+1;
1316 reg_number
= decode_reg_name (asmspec
);
1317 /* First detect errors in declaring global registers. */
1318 if (reg_number
== -1)
1319 error ("register name not specified for %q+D", decl
);
1320 else if (reg_number
< 0)
1321 error ("invalid register name for %q+D", decl
);
1322 else if (TYPE_MODE (TREE_TYPE (decl
)) == BLKmode
)
1323 error ("data type of %q+D isn%'t suitable for a register",
1325 else if (! HARD_REGNO_MODE_OK (reg_number
, TYPE_MODE (TREE_TYPE (decl
))))
1326 error ("register specified for %q+D isn%'t suitable for data type",
1328 /* Now handle properly declared static register variables. */
1333 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1335 DECL_INITIAL (decl
) = 0;
1336 error ("global register variable has initial value");
1338 if (TREE_THIS_VOLATILE (decl
))
1339 warning (OPT_Wvolatile_register_var
,
1340 "optimization may eliminate reads and/or "
1341 "writes to register variables");
1343 /* If the user specified one of the eliminables registers here,
1344 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1345 confused with that register and be eliminated. This usage is
1346 somewhat suspect... */
1348 SET_DECL_RTL (decl
, gen_rtx_raw_REG (DECL_MODE (decl
), reg_number
));
1349 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1350 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1352 if (TREE_STATIC (decl
))
1354 /* Make this register global, so not usable for anything
1356 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1357 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1358 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1360 nregs
= hard_regno_nregs
[reg_number
][DECL_MODE (decl
)];
1362 globalize_reg (reg_number
+ --nregs
);
1365 /* As a register variable, it has no section. */
1369 /* Now handle ordinary static variables and functions (in memory).
1370 Also handle vars declared register invalidly. */
1371 else if (name
[0] == '*')
1373 #ifdef REGISTER_PREFIX
1374 if (strlen (REGISTER_PREFIX
) != 0)
1376 reg_number
= decode_reg_name (name
);
1377 if (reg_number
>= 0 || reg_number
== -3)
1378 error ("register name given for non-register variable %q+D", decl
);
1383 /* Specifying a section attribute on a variable forces it into a
1384 non-.bss section, and thus it cannot be common. */
1385 if (TREE_CODE (decl
) == VAR_DECL
1386 && DECL_SECTION_NAME (decl
) != NULL_TREE
1387 && DECL_INITIAL (decl
) == NULL_TREE
1388 && DECL_COMMON (decl
))
1389 DECL_COMMON (decl
) = 0;
1391 /* Variables can't be both common and weak. */
1392 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1393 DECL_COMMON (decl
) = 0;
1395 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1396 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1398 x
= gen_rtx_SYMBOL_REF (Pmode
, name
);
1399 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1400 SET_SYMBOL_REF_DECL (x
, decl
);
1402 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1403 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1404 set_mem_attributes (x
, decl
, 1);
1405 SET_DECL_RTL (decl
, x
);
1407 /* Optionally set flags or add text to the name to record information
1408 such as that it is a function name.
1409 If the name is changed, the macro ASM_OUTPUT_LABELREF
1410 will have to know how to strip this information. */
1411 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1413 /* Make this function static known to the mudflap runtime. */
1414 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1415 mudflap_enqueue_decl (decl
);
1418 /* Output a string of literal assembler code
1419 for an `asm' keyword used between functions. */
1422 assemble_asm (tree string
)
1426 if (TREE_CODE (string
) == ADDR_EXPR
)
1427 string
= TREE_OPERAND (string
, 0);
1429 fprintf (asm_out_file
, "\t%s\n", TREE_STRING_POINTER (string
));
1432 /* Record an element in the table of global destructors. SYMBOL is
1433 a SYMBOL_REF of the function to be called; PRIORITY is a number
1434 between 0 and MAX_INIT_PRIORITY. */
1437 default_stabs_asm_out_destructor (rtx symbol ATTRIBUTE_UNUSED
,
1438 int priority ATTRIBUTE_UNUSED
)
1440 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1441 /* Tell GNU LD that this is part of the static destructor set.
1442 This will work for any system that uses stabs, most usefully
1444 dbxout_begin_simple_stabs ("___DTOR_LIST__", 22 /* N_SETT */);
1445 dbxout_stab_value_label (XSTR (symbol
, 0));
1447 sorry ("global destructors not supported on this target");
1451 /* Write the address of the entity given by SYMBOL to SEC. */
1453 assemble_addr_to_section (rtx symbol
, section
*sec
)
1455 switch_to_section (sec
);
1456 assemble_align (POINTER_SIZE
);
1457 assemble_integer (symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1460 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1461 not) section for PRIORITY. */
1463 get_cdtor_priority_section (int priority
, bool constructor_p
)
1467 /* ??? This only works reliably with the GNU linker. */
1468 sprintf (buf
, "%s.%.5u",
1469 constructor_p
? ".ctors" : ".dtors",
1470 /* Invert the numbering so the linker puts us in the proper
1471 order; constructors are run from right to left, and the
1472 linker sorts in increasing order. */
1473 MAX_INIT_PRIORITY
- priority
);
1474 return get_section (buf
, SECTION_WRITE
, NULL
);
1478 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1482 if (priority
!= DEFAULT_INIT_PRIORITY
)
1483 sec
= get_cdtor_priority_section (priority
,
1484 /*constructor_p=*/false);
1486 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1488 assemble_addr_to_section (symbol
, sec
);
1491 #ifdef DTORS_SECTION_ASM_OP
1493 default_dtor_section_asm_out_destructor (rtx symbol
,
1494 int priority ATTRIBUTE_UNUSED
)
1496 assemble_addr_to_section (symbol
, dtors_section
);
1500 /* Likewise for global constructors. */
1503 default_stabs_asm_out_constructor (rtx symbol ATTRIBUTE_UNUSED
,
1504 int priority ATTRIBUTE_UNUSED
)
1506 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1507 /* Tell GNU LD that this is part of the static destructor set.
1508 This will work for any system that uses stabs, most usefully
1510 dbxout_begin_simple_stabs ("___CTOR_LIST__", 22 /* N_SETT */);
1511 dbxout_stab_value_label (XSTR (symbol
, 0));
1513 sorry ("global constructors not supported on this target");
1518 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1522 if (priority
!= DEFAULT_INIT_PRIORITY
)
1523 sec
= get_cdtor_priority_section (priority
,
1524 /*constructor_p=*/true);
1526 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1528 assemble_addr_to_section (symbol
, sec
);
1531 #ifdef CTORS_SECTION_ASM_OP
1533 default_ctor_section_asm_out_constructor (rtx symbol
,
1534 int priority ATTRIBUTE_UNUSED
)
1536 assemble_addr_to_section (symbol
, ctors_section
);
1540 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1541 a nonzero value if the constant pool should be output before the
1542 start of the function, or a zero value if the pool should output
1543 after the end of the function. The default is to put it before the
1546 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1547 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1550 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1551 to be output to assembler.
1552 Set first_global_object_name and weak_global_object_name as appropriate. */
1555 notice_global_symbol (tree decl
)
1557 const char **type
= &first_global_object_name
;
1559 if (first_global_object_name
1560 || !TREE_PUBLIC (decl
)
1561 || DECL_EXTERNAL (decl
)
1562 || !DECL_NAME (decl
)
1563 || (TREE_CODE (decl
) != FUNCTION_DECL
1564 && (TREE_CODE (decl
) != VAR_DECL
1565 || (DECL_COMMON (decl
)
1566 && (DECL_INITIAL (decl
) == 0
1567 || DECL_INITIAL (decl
) == error_mark_node
))))
1568 || !MEM_P (DECL_RTL (decl
)))
1571 /* We win when global object is found, but it is useful to know about weak
1572 symbol as well so we can produce nicer unique names. */
1573 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1574 type
= &weak_global_object_name
;
1580 rtx decl_rtl
= DECL_RTL (decl
);
1582 p
= targetm
.strip_name_encoding (XSTR (XEXP (decl_rtl
, 0), 0));
1583 name
= ggc_strdup (p
);
1589 /* Output assembler code for the constant pool of a function and associated
1590 with defining the name of the function. DECL describes the function.
1591 NAME is the function's name. For the constant pool, we use the current
1592 constant pool data. */
1595 assemble_start_function (tree decl
, const char *fnname
)
1598 char tmp_label
[100];
1599 bool hot_label_written
= false;
1601 cfun
->unlikely_text_section_name
= NULL
;
1603 first_function_block_is_cold
= false;
1604 if (flag_reorder_blocks_and_partition
)
1606 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1607 cfun
->hot_section_label
= ggc_strdup (tmp_label
);
1608 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1609 cfun
->cold_section_label
= ggc_strdup (tmp_label
);
1610 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1611 cfun
->hot_section_end_label
= ggc_strdup (tmp_label
);
1612 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1613 cfun
->cold_section_end_label
= ggc_strdup (tmp_label
);
1618 cfun
->hot_section_label
= NULL
;
1619 cfun
->cold_section_label
= NULL
;
1620 cfun
->hot_section_end_label
= NULL
;
1621 cfun
->cold_section_end_label
= NULL
;
1624 /* The following code does not need preprocessing in the assembler. */
1628 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1629 output_constant_pool (fnname
, decl
);
1631 resolve_unique_section (decl
, 0, flag_function_sections
);
1633 /* Make sure the not and cold text (code) sections are properly
1634 aligned. This is necessary here in the case where the function
1635 has both hot and cold sections, because we don't want to re-set
1636 the alignment when the section switch happens mid-function. */
1638 if (flag_reorder_blocks_and_partition
)
1640 switch_to_section (unlikely_text_section ());
1641 assemble_align (FUNCTION_BOUNDARY
);
1642 ASM_OUTPUT_LABEL (asm_out_file
, cfun
->cold_section_label
);
1644 /* When the function starts with a cold section, we need to explicitly
1645 align the hot section and write out the hot section label.
1646 But if the current function is a thunk, we do not have a CFG. */
1647 if (!current_function_is_thunk
1648 && BB_PARTITION (ENTRY_BLOCK_PTR
->next_bb
) == BB_COLD_PARTITION
)
1650 switch_to_section (text_section
);
1651 assemble_align (FUNCTION_BOUNDARY
);
1652 ASM_OUTPUT_LABEL (asm_out_file
, cfun
->hot_section_label
);
1653 hot_label_written
= true;
1654 first_function_block_is_cold
= true;
1657 else if (DECL_SECTION_NAME (decl
))
1659 /* Calls to function_section rely on first_function_block_is_cold
1660 being accurate. The first block may be cold even if we aren't
1661 doing partitioning, if the entire function was decided by
1662 choose_function_section (predict.c) to be cold. */
1664 initialize_cold_section_name ();
1666 if (cfun
->unlikely_text_section_name
1667 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl
)),
1668 cfun
->unlikely_text_section_name
) == 0)
1669 first_function_block_is_cold
= true;
1672 in_cold_section_p
= first_function_block_is_cold
;
1674 /* Switch to the correct text section for the start of the function. */
1676 switch_to_section (function_section (decl
));
1677 if (flag_reorder_blocks_and_partition
1678 && !hot_label_written
)
1679 ASM_OUTPUT_LABEL (asm_out_file
, cfun
->hot_section_label
);
1681 /* Tell assembler to move to target machine's alignment for functions. */
1682 align
= floor_log2 (FUNCTION_BOUNDARY
/ BITS_PER_UNIT
);
1683 if (align
< force_align_functions_log
)
1684 align
= force_align_functions_log
;
1687 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1690 /* Handle a user-specified function alignment.
1691 Note that we still need to align to FUNCTION_BOUNDARY, as above,
1692 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1693 if (align_functions_log
> align
1694 && cfun
->function_frequency
!= FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
)
1696 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1697 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1698 align_functions_log
, align_functions
- 1);
1700 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1704 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1705 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1708 (*debug_hooks
->begin_function
) (decl
);
1710 /* Make function name accessible from other files, if appropriate. */
1712 if (TREE_PUBLIC (decl
))
1714 notice_global_symbol (decl
);
1716 globalize_decl (decl
);
1718 maybe_assemble_visibility (decl
);
1721 if (DECL_PRESERVE_P (decl
))
1722 targetm
.asm_out
.mark_decl_preserved (fnname
);
1724 /* Do any machine/system dependent processing of the function name. */
1725 #ifdef ASM_DECLARE_FUNCTION_NAME
1726 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1728 /* Standard thing is just output label for the function. */
1729 ASM_OUTPUT_LABEL (asm_out_file
, fnname
);
1730 #endif /* ASM_DECLARE_FUNCTION_NAME */
1733 /* Output assembler code associated with defining the size of the
1734 function. DECL describes the function. NAME is the function's name. */
1737 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1739 #ifdef ASM_DECLARE_FUNCTION_SIZE
1740 /* We could have switched section in the middle of the function. */
1741 if (flag_reorder_blocks_and_partition
)
1742 switch_to_section (function_section (decl
));
1743 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1745 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1747 output_constant_pool (fnname
, decl
);
1748 switch_to_section (function_section (decl
)); /* need to switch back */
1750 /* Output labels for end of hot/cold text sections (to be used by
1752 if (flag_reorder_blocks_and_partition
)
1754 section
*save_text_section
;
1756 save_text_section
= in_section
;
1757 switch_to_section (unlikely_text_section ());
1758 ASM_OUTPUT_LABEL (asm_out_file
, cfun
->cold_section_end_label
);
1759 if (first_function_block_is_cold
)
1760 switch_to_section (text_section
);
1762 switch_to_section (function_section (decl
));
1763 ASM_OUTPUT_LABEL (asm_out_file
, cfun
->hot_section_end_label
);
1764 switch_to_section (save_text_section
);
1768 /* Assemble code to leave SIZE bytes of zeros. */
1771 assemble_zeros (unsigned HOST_WIDE_INT size
)
1773 /* Do no output if -fsyntax-only. */
1774 if (flag_syntax_only
)
1777 #ifdef ASM_NO_SKIP_IN_TEXT
1778 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1779 so we must output 0s explicitly in the text section. */
1780 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1782 unsigned HOST_WIDE_INT i
;
1783 for (i
= 0; i
< size
; i
++)
1784 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1789 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1792 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1795 assemble_align (int align
)
1797 if (align
> BITS_PER_UNIT
)
1799 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1803 /* Assemble a string constant with the specified C string as contents. */
1806 assemble_string (const char *p
, int size
)
1811 /* If the string is very long, split it up. */
1815 int thissize
= size
- pos
;
1816 if (thissize
> maximum
)
1819 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1827 /* A noswitch_section_callback for lcomm_section. */
1830 emit_local (tree decl ATTRIBUTE_UNUSED
,
1831 const char *name ATTRIBUTE_UNUSED
,
1832 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1833 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1835 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1836 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1837 size
, DECL_ALIGN (decl
));
1839 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1840 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1843 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1848 /* A noswitch_section_callback for bss_noswitch_section. */
1850 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
1852 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1853 const char *name ATTRIBUTE_UNUSED
,
1854 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1855 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1857 #if defined ASM_OUTPUT_ALIGNED_BSS
1858 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
, DECL_ALIGN (decl
));
1861 ASM_OUTPUT_BSS (asm_out_file
, decl
, name
, size
, rounded
);
1867 /* A noswitch_section_callback for comm_section. */
1870 emit_common (tree decl ATTRIBUTE_UNUSED
,
1871 const char *name ATTRIBUTE_UNUSED
,
1872 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1873 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1875 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1876 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1877 size
, DECL_ALIGN (decl
));
1879 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1880 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1883 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1888 /* A noswitch_section_callback for tls_comm_section. */
1891 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1892 const char *name ATTRIBUTE_UNUSED
,
1893 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1894 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1896 #ifdef ASM_OUTPUT_TLS_COMMON
1897 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
1900 sorry ("thread-local COMMON data not implemented");
1905 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1906 NAME is the name of DECL's SYMBOL_REF. */
1909 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
)
1911 unsigned HOST_WIDE_INT size
, rounded
;
1913 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
1916 /* Don't allocate zero bytes of common,
1917 since that means "undefined external" in the linker. */
1921 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1922 so that each uninitialized object starts on such a boundary. */
1923 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
1924 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
1925 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
1927 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
1928 && (unsigned HOST_WIDE_INT
) DECL_ALIGN_UNIT (decl
) > rounded
)
1929 warning (0, "requested alignment for %q+D is greater than "
1930 "implemented alignment of %wu", decl
, rounded
);
1933 /* A subroutine of assemble_variable. Output the label and contents of
1934 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1935 is as for assemble_variable. */
1938 assemble_variable_contents (tree decl
, const char *name
,
1939 bool dont_output_data
)
1941 /* Do any machine/system dependent processing of the object. */
1942 #ifdef ASM_DECLARE_OBJECT_NAME
1943 last_assemble_variable_decl
= decl
;
1944 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
1946 /* Standard thing is just output label for the object. */
1947 ASM_OUTPUT_LABEL (asm_out_file
, name
);
1948 #endif /* ASM_DECLARE_OBJECT_NAME */
1950 if (!dont_output_data
)
1952 if (DECL_INITIAL (decl
)
1953 && DECL_INITIAL (decl
) != error_mark_node
1954 && !initializer_zerop (DECL_INITIAL (decl
)))
1955 /* Output the actual data. */
1956 output_constant (DECL_INITIAL (decl
),
1957 tree_low_cst (DECL_SIZE_UNIT (decl
), 1),
1960 /* Leave space for it. */
1961 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl
), 1));
1965 /* Assemble everything that is needed for a variable or function declaration.
1966 Not used for automatic variables, and not used for function definitions.
1967 Should not be called for variables of incomplete structure type.
1969 TOP_LEVEL is nonzero if this variable has file scope.
1970 AT_END is nonzero if this is the special handling, at end of compilation,
1971 to define things that have had only tentative definitions.
1972 DONT_OUTPUT_DATA if nonzero means don't actually output the
1973 initial value (that will be done by the caller). */
1976 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
1977 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
1980 rtx decl_rtl
, symbol
;
1983 if (! targetm
.have_tls
1984 && TREE_CODE (decl
) == VAR_DECL
1985 && DECL_THREAD_LOCAL_P (decl
))
1987 tree to
= emutls_decl (decl
);
1989 /* If this variable is defined locally, then we need to initialize the
1990 control structure with size and alignment information. We do this
1991 at the last moment because tentative definitions can take a locally
1992 defined but uninitialized variable and initialize it later, which
1993 would result in incorrect contents. */
1994 if (! DECL_EXTERNAL (to
)
1995 && (! DECL_COMMON (to
)
1996 || (DECL_INITIAL (decl
)
1997 && DECL_INITIAL (decl
) != error_mark_node
)))
1999 VEC(constructor_elt
,gc
) *v
= VEC_alloc (constructor_elt
, gc
, 4);
2000 constructor_elt
*elt
;
2001 tree type
= TREE_TYPE (to
);
2002 tree field
= TYPE_FIELDS (type
);
2004 elt
= VEC_quick_push (constructor_elt
, v
, NULL
);
2006 elt
->value
= fold_convert (TREE_TYPE (field
), DECL_SIZE_UNIT (decl
));
2008 elt
= VEC_quick_push (constructor_elt
, v
, NULL
);
2009 field
= TREE_CHAIN (field
);
2011 elt
->value
= build_int_cst (TREE_TYPE (field
),
2012 DECL_ALIGN_UNIT (decl
));
2014 elt
= VEC_quick_push (constructor_elt
, v
, NULL
);
2015 field
= TREE_CHAIN (field
);
2017 elt
->value
= null_pointer_node
;
2019 elt
= VEC_quick_push (constructor_elt
, v
, NULL
);
2020 field
= TREE_CHAIN (field
);
2022 elt
->value
= get_emutls_init_templ_addr (decl
);
2024 DECL_INITIAL (to
) = build_constructor (type
, v
);
2026 /* Make sure the template is marked as needed early enough.
2027 Without this, if the variable is placed in a
2028 section-anchored block, the template will only be marked
2029 when it's too late. */
2030 record_references_in_initializer (to
);
2036 last_assemble_variable_decl
= 0;
2038 /* Normally no need to say anything here for external references,
2039 since assemble_external is called by the language-specific code
2040 when a declaration is first seen. */
2042 if (DECL_EXTERNAL (decl
))
2045 /* Output no assembler code for a function declaration.
2046 Only definitions of functions output anything. */
2048 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2051 /* Do nothing for global register variables. */
2052 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
2054 TREE_ASM_WRITTEN (decl
) = 1;
2058 /* If type was incomplete when the variable was declared,
2059 see if it is complete now. */
2061 if (DECL_SIZE (decl
) == 0)
2062 layout_decl (decl
, 0);
2064 /* Still incomplete => don't allocate it; treat the tentative defn
2065 (which is what it must have been) as an `extern' reference. */
2067 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2069 error ("storage size of %q+D isn%'t known", decl
);
2070 TREE_ASM_WRITTEN (decl
) = 1;
2074 /* The first declaration of a variable that comes through this function
2075 decides whether it is global (in C, has external linkage)
2076 or local (in C, has internal linkage). So do nothing more
2077 if this function has already run. */
2079 if (TREE_ASM_WRITTEN (decl
))
2082 /* Make sure targetm.encode_section_info is invoked before we set
2084 decl_rtl
= DECL_RTL (decl
);
2086 TREE_ASM_WRITTEN (decl
) = 1;
2088 /* Do no output if -fsyntax-only. */
2089 if (flag_syntax_only
)
2094 if (! dont_output_data
2095 && ! host_integerp (DECL_SIZE_UNIT (decl
), 1))
2097 error ("size of variable %q+D is too large", decl
);
2101 gcc_assert (MEM_P (decl_rtl
));
2102 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2103 symbol
= XEXP (decl_rtl
, 0);
2104 name
= XSTR (symbol
, 0);
2105 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2106 notice_global_symbol (decl
);
2108 /* Compute the alignment of this data. */
2110 align_variable (decl
, dont_output_data
);
2111 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2113 if (TREE_PUBLIC (decl
))
2114 maybe_assemble_visibility (decl
);
2116 if (DECL_PRESERVE_P (decl
))
2117 targetm
.asm_out
.mark_decl_preserved (name
);
2119 /* First make the assembler name(s) global if appropriate. */
2120 sect
= get_variable_section (decl
, false);
2121 if (TREE_PUBLIC (decl
)
2123 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2124 globalize_decl (decl
);
2126 /* Output any data that we will need to use the address of. */
2127 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2128 output_addressed_constants (DECL_INITIAL (decl
));
2130 /* dbxout.c needs to know this. */
2131 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2132 DECL_IN_TEXT_SECTION (decl
) = 1;
2134 /* If the decl is part of an object_block, make sure that the decl
2135 has been positioned within its block, but do not write out its
2136 definition yet. output_object_blocks will do that later. */
2137 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2139 gcc_assert (!dont_output_data
);
2140 place_block_symbol (symbol
);
2142 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2143 assemble_noswitch_variable (decl
, name
, sect
);
2146 switch_to_section (sect
);
2147 if (DECL_ALIGN (decl
) > BITS_PER_UNIT
)
2148 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (DECL_ALIGN_UNIT (decl
)));
2149 assemble_variable_contents (decl
, name
, dont_output_data
);
2153 /* Return 1 if type TYPE contains any pointers. */
2156 contains_pointers_p (tree type
)
2158 switch (TREE_CODE (type
))
2161 case REFERENCE_TYPE
:
2162 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2163 so I'll play safe and return 1. */
2169 case QUAL_UNION_TYPE
:
2172 /* For a type that has fields, see if the fields have pointers. */
2173 for (fields
= TYPE_FIELDS (type
); fields
; fields
= TREE_CHAIN (fields
))
2174 if (TREE_CODE (fields
) == FIELD_DECL
2175 && contains_pointers_p (TREE_TYPE (fields
)))
2181 /* An array type contains pointers if its element type does. */
2182 return contains_pointers_p (TREE_TYPE (type
));
2189 /* In unit-at-a-time mode, we delay assemble_external processing until
2190 the compilation unit is finalized. This is the best we can do for
2191 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2192 it all the way to final. See PR 17982 for further discussion. */
2193 static GTY(()) tree pending_assemble_externals
;
2195 #ifdef ASM_OUTPUT_EXTERNAL
2196 /* True if DECL is a function decl for which no out-of-line copy exists.
2197 It is assumed that DECL's assembler name has been set. */
2200 incorporeal_function_p (tree decl
)
2202 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2206 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2207 && DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
)
2210 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2211 if (strncmp (name
, "__builtin_", strlen ("__builtin_")) == 0)
2217 /* Actually do the tests to determine if this is necessary, and invoke
2218 ASM_OUTPUT_EXTERNAL. */
2220 assemble_external_real (tree decl
)
2222 rtx rtl
= DECL_RTL (decl
);
2224 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2225 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2226 && !incorporeal_function_p (decl
))
2228 /* Some systems do require some output. */
2229 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2230 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2236 process_pending_assemble_externals (void)
2238 #ifdef ASM_OUTPUT_EXTERNAL
2240 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2241 assemble_external_real (TREE_VALUE (list
));
2243 pending_assemble_externals
= 0;
2247 /* Output something to declare an external symbol to the assembler.
2248 (Most assemblers don't need this, so we normally output nothing.)
2249 Do nothing if DECL is not external. */
2252 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2254 /* Because most platforms do not define ASM_OUTPUT_EXTERNAL, the
2255 main body of this code is only rarely exercised. To provide some
2256 testing, on all platforms, we make sure that the ASM_OUT_FILE is
2257 open. If it's not, we should not be calling this function. */
2258 gcc_assert (asm_out_file
);
2260 #ifdef ASM_OUTPUT_EXTERNAL
2261 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2264 /* We want to output external symbols at very last to check if they
2265 are references or not. */
2266 pending_assemble_externals
= tree_cons (0, decl
,
2267 pending_assemble_externals
);
2271 /* Similar, for calling a library function FUN. */
2274 assemble_external_libcall (rtx fun
)
2276 /* Declare library function name external when first used, if nec. */
2277 if (! SYMBOL_REF_USED (fun
))
2279 SYMBOL_REF_USED (fun
) = 1;
2280 targetm
.asm_out
.external_libcall (fun
);
2284 /* Assemble a label named NAME. */
2287 assemble_label (const char *name
)
2289 ASM_OUTPUT_LABEL (asm_out_file
, name
);
2292 /* Set the symbol_referenced flag for ID. */
2294 mark_referenced (tree id
)
2296 TREE_SYMBOL_REFERENCED (id
) = 1;
2299 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2301 mark_decl_referenced (tree decl
)
2303 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2305 /* Extern inline functions don't become needed when referenced.
2306 If we know a method will be emitted in other TU and no new
2307 functions can be marked reachable, just use the external
2309 struct cgraph_node
*node
= cgraph_node (decl
);
2310 if (!DECL_EXTERNAL (decl
)
2311 && (!node
->local
.vtable_method
|| !cgraph_global_info_ready
2312 || !node
->local
.finalized
))
2313 cgraph_mark_needed_node (node
);
2315 else if (TREE_CODE (decl
) == VAR_DECL
)
2317 struct varpool_node
*node
= varpool_node (decl
);
2318 varpool_mark_needed_node (node
);
2319 /* C++ frontend use mark_decl_references to force COMDAT variables
2320 to be output that might appear dead otherwise. */
2321 node
->force_output
= true;
2323 /* else do nothing - we can get various sorts of CST nodes here,
2324 which do not need to be marked. */
2328 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2329 until we find an identifier that is not itself a transparent alias.
2330 Modify the alias passed to it by reference (and all aliases on the
2331 way to the ultimate target), such that they do not have to be
2332 followed again, and return the ultimate target of the alias
2336 ultimate_transparent_alias_target (tree
*alias
)
2338 tree target
= *alias
;
2340 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
2342 gcc_assert (TREE_CHAIN (target
));
2343 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
2344 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
2345 && ! TREE_CHAIN (target
));
2352 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2353 starts with a *, the rest of NAME is output verbatim. Otherwise
2354 NAME is transformed in a target-specific way (usually by the
2355 addition of an underscore). */
2358 assemble_name_raw (FILE *file
, const char *name
)
2361 fputs (&name
[1], file
);
2363 ASM_OUTPUT_LABELREF (file
, name
);
2366 /* Like assemble_name_raw, but should be used when NAME might refer to
2367 an entity that is also represented as a tree (like a function or
2368 variable). If NAME does refer to such an entity, that entity will
2369 be marked as referenced. */
2372 assemble_name (FILE *file
, const char *name
)
2374 const char *real_name
;
2377 real_name
= targetm
.strip_name_encoding (name
);
2379 id
= maybe_get_identifier (real_name
);
2384 mark_referenced (id
);
2385 ultimate_transparent_alias_target (&id
);
2387 name
= IDENTIFIER_POINTER (id
);
2388 gcc_assert (! TREE_CHAIN (id
));
2391 assemble_name_raw (file
, name
);
2394 /* Allocate SIZE bytes writable static space with a gensym name
2395 and return an RTX to refer to its address. */
2398 assemble_static_space (unsigned HOST_WIDE_INT size
)
2401 const char *namestring
;
2404 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2406 namestring
= ggc_strdup (name
);
2408 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2409 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2411 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2412 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2415 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2416 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2419 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2420 so that each uninitialized object starts on such a boundary. */
2421 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2422 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2423 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2424 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2425 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2426 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2433 /* Assemble the static constant template for function entry trampolines.
2434 This is done at most once per compilation.
2435 Returns an RTX for the address of the template. */
2437 static GTY(()) rtx initial_trampoline
;
2439 #ifdef TRAMPOLINE_TEMPLATE
2441 assemble_trampoline_template (void)
2448 if (initial_trampoline
)
2449 return initial_trampoline
;
2451 /* By default, put trampoline templates in read-only data section. */
2453 #ifdef TRAMPOLINE_SECTION
2454 switch_to_section (TRAMPOLINE_SECTION
);
2456 switch_to_section (readonly_data_section
);
2459 /* Write the assembler code to define one. */
2460 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2463 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2466 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2467 TRAMPOLINE_TEMPLATE (asm_out_file
);
2469 /* Record the rtl to refer to it. */
2470 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2471 name
= ggc_strdup (label
);
2472 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2473 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2475 initial_trampoline
= gen_rtx_MEM (BLKmode
, symbol
);
2476 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2478 return initial_trampoline
;
2482 /* A and B are either alignments or offsets. Return the minimum alignment
2483 that may be assumed after adding the two together. */
2485 static inline unsigned
2486 min_align (unsigned int a
, unsigned int b
)
2488 return (a
| b
) & -(a
| b
);
2491 /* Return the assembler directive for creating a given kind of integer
2492 object. SIZE is the number of bytes in the object and ALIGNED_P
2493 indicates whether it is known to be aligned. Return NULL if the
2494 assembly dialect has no such directive.
2496 The returned string should be printed at the start of a new line and
2497 be followed immediately by the object's initial value. */
2500 integer_asm_op (int size
, int aligned_p
)
2502 struct asm_int_op
*ops
;
2505 ops
= &targetm
.asm_out
.aligned_op
;
2507 ops
= &targetm
.asm_out
.unaligned_op
;
2512 return targetm
.asm_out
.byte_op
;
2526 /* Use directive OP to assemble an integer object X. Print OP at the
2527 start of the line, followed immediately by the value of X. */
2530 assemble_integer_with_op (const char *op
, rtx x
)
2532 fputs (op
, asm_out_file
);
2533 output_addr_const (asm_out_file
, x
);
2534 fputc ('\n', asm_out_file
);
2537 /* The default implementation of the asm_out.integer target hook. */
2540 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2541 unsigned int size ATTRIBUTE_UNUSED
,
2542 int aligned_p ATTRIBUTE_UNUSED
)
2544 const char *op
= integer_asm_op (size
, aligned_p
);
2545 /* Avoid GAS bugs for large values. Specifically negative values whose
2546 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2547 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE
/ BITS_PER_UNIT
)
2549 return op
&& (assemble_integer_with_op (op
, x
), true);
2552 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2553 the alignment of the integer in bits. Return 1 if we were able to output
2554 the constant, otherwise 0. We must be able to output the constant,
2555 if FORCE is nonzero. */
2558 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2562 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2564 /* See if the target hook can handle this kind of object. */
2565 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2568 /* If the object is a multi-byte one, try splitting it up. Split
2569 it into words it if is multi-word, otherwise split it into bytes. */
2572 enum machine_mode omode
, imode
;
2573 unsigned int subalign
;
2574 unsigned int subsize
, i
;
2576 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2577 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2578 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, MODE_INT
, 0);
2579 imode
= mode_for_size (size
* BITS_PER_UNIT
, MODE_INT
, 0);
2581 for (i
= 0; i
< size
; i
+= subsize
)
2583 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2584 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2590 /* If we've printed some of it, but not all of it, there's no going
2595 gcc_assert (!force
);
2601 assemble_real (REAL_VALUE_TYPE d
, enum machine_mode mode
, unsigned int align
)
2603 long data
[4] = {0, 0, 0, 0};
2605 int bitsize
, nelts
, nunits
, units_per
;
2607 /* This is hairy. We have a quantity of known size. real_to_target
2608 will put it into an array of *host* longs, 32 bits per element
2609 (even if long is more than 32 bits). We need to determine the
2610 number of array elements that are occupied (nelts) and the number
2611 of *target* min-addressable units that will be occupied in the
2612 object file (nunits). We cannot assume that 32 divides the
2613 mode's bitsize (size * BITS_PER_UNIT) evenly.
2615 size * BITS_PER_UNIT is used here to make sure that padding bits
2616 (which might appear at either end of the value; real_to_target
2617 will include the padding bits in its output array) are included. */
2619 nunits
= GET_MODE_SIZE (mode
);
2620 bitsize
= nunits
* BITS_PER_UNIT
;
2621 nelts
= CEIL (bitsize
, 32);
2622 units_per
= 32 / BITS_PER_UNIT
;
2624 real_to_target (data
, &d
, mode
);
2626 /* Put out the first word with the specified alignment. */
2627 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2628 nunits
-= units_per
;
2630 /* Subsequent words need only 32-bit alignment. */
2631 align
= min_align (align
, 32);
2633 for (i
= 1; i
< nelts
; i
++)
2635 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2636 nunits
-= units_per
;
2640 /* Given an expression EXP with a constant value,
2641 reduce it to the sum of an assembler symbol and an integer.
2642 Store them both in the structure *VALUE.
2643 EXP must be reducible. */
2645 struct addr_const
GTY(())
2648 HOST_WIDE_INT offset
;
2652 decode_addr_const (tree exp
, struct addr_const
*value
)
2654 tree target
= TREE_OPERAND (exp
, 0);
2660 if (TREE_CODE (target
) == COMPONENT_REF
2661 && host_integerp (byte_position (TREE_OPERAND (target
, 1)), 0))
2664 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2665 target
= TREE_OPERAND (target
, 0);
2667 else if (TREE_CODE (target
) == ARRAY_REF
2668 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2670 offset
+= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target
)), 1)
2671 * tree_low_cst (TREE_OPERAND (target
, 1), 0));
2672 target
= TREE_OPERAND (target
, 0);
2678 switch (TREE_CODE (target
))
2682 x
= DECL_RTL (target
);
2686 x
= gen_rtx_MEM (FUNCTION_MODE
,
2687 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2695 x
= output_constant_def (target
, 1);
2702 gcc_assert (MEM_P (x
));
2706 value
->offset
= offset
;
2709 /* Uniquize all constants that appear in memory.
2710 Each constant in memory thus far output is recorded
2711 in `const_desc_table'. */
2713 struct constant_descriptor_tree
GTY(())
2715 /* A MEM for the constant. */
2718 /* The value of the constant. */
2721 /* Hash of value. Computing the hash from value each time
2722 hashfn is called can't work properly, as that means recursive
2723 use of the hash table during hash table expansion. */
2727 static GTY((param_is (struct constant_descriptor_tree
)))
2728 htab_t const_desc_htab
;
2730 static struct constant_descriptor_tree
* build_constant_desc (tree
);
2731 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2733 /* Compute a hash code for a constant expression. */
2736 const_desc_hash (const void *ptr
)
2738 return ((struct constant_descriptor_tree
*)ptr
)->hash
;
2742 const_hash_1 (const tree exp
)
2747 enum tree_code code
= TREE_CODE (exp
);
2749 /* Either set P and LEN to the address and len of something to hash and
2750 exit the switch or return a value. */
2755 p
= (char *) &TREE_INT_CST (exp
);
2756 len
= sizeof TREE_INT_CST (exp
);
2760 return real_hash (TREE_REAL_CST_PTR (exp
));
2763 p
= TREE_STRING_POINTER (exp
);
2764 len
= TREE_STRING_LENGTH (exp
);
2768 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2769 + const_hash_1 (TREE_IMAGPART (exp
)));
2773 unsigned HOST_WIDE_INT idx
;
2776 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2778 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2780 hi
= hi
* 603 + const_hash_1 (value
);
2788 struct addr_const value
;
2790 decode_addr_const (exp
, &value
);
2791 switch (GET_CODE (value
.base
))
2794 /* Don't hash the address of the SYMBOL_REF;
2795 only use the offset and the symbol name. */
2797 p
= XSTR (value
.base
, 0);
2798 for (i
= 0; p
[i
] != 0; i
++)
2799 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2803 hi
= value
.offset
+ CODE_LABEL_NUMBER (XEXP (value
.base
, 0)) * 13;
2814 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2815 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2819 case NON_LVALUE_EXPR
:
2820 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2823 /* A language specific constant. Just hash the code. */
2827 /* Compute hashing function. */
2829 for (i
= 0; i
< len
; i
++)
2830 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2835 /* Wrapper of compare_constant, for the htab interface. */
2837 const_desc_eq (const void *p1
, const void *p2
)
2839 const struct constant_descriptor_tree
*c1
= p1
;
2840 const struct constant_descriptor_tree
*c2
= p2
;
2841 if (c1
->hash
!= c2
->hash
)
2843 return compare_constant (c1
->value
, c2
->value
);
2846 /* Compare t1 and t2, and return 1 only if they are known to result in
2847 the same bit pattern on output. */
2850 compare_constant (const tree t1
, const tree t2
)
2852 enum tree_code typecode
;
2854 if (t1
== NULL_TREE
)
2855 return t2
== NULL_TREE
;
2856 if (t2
== NULL_TREE
)
2859 if (TREE_CODE (t1
) != TREE_CODE (t2
))
2862 switch (TREE_CODE (t1
))
2865 /* Integer constants are the same only if the same width of type. */
2866 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2868 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2870 return tree_int_cst_equal (t1
, t2
);
2873 /* Real constants are the same only if the same width of type. */
2874 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2877 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
2880 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2883 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
2884 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
2885 TREE_STRING_LENGTH (t1
)));
2888 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
2889 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
2893 VEC(constructor_elt
, gc
) *v1
, *v2
;
2894 unsigned HOST_WIDE_INT idx
;
2896 typecode
= TREE_CODE (TREE_TYPE (t1
));
2897 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
2900 if (typecode
== ARRAY_TYPE
)
2902 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
2903 /* For arrays, check that the sizes all match. */
2904 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
2906 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
2911 /* For record and union constructors, require exact type
2913 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
2917 v1
= CONSTRUCTOR_ELTS (t1
);
2918 v2
= CONSTRUCTOR_ELTS (t2
);
2919 if (VEC_length (constructor_elt
, v1
)
2920 != VEC_length (constructor_elt
, v2
))
2923 for (idx
= 0; idx
< VEC_length (constructor_elt
, v1
); ++idx
)
2925 constructor_elt
*c1
= VEC_index (constructor_elt
, v1
, idx
);
2926 constructor_elt
*c2
= VEC_index (constructor_elt
, v2
, idx
);
2928 /* Check that each value is the same... */
2929 if (!compare_constant (c1
->value
, c2
->value
))
2931 /* ... and that they apply to the same fields! */
2932 if (typecode
== ARRAY_TYPE
)
2934 if (!compare_constant (c1
->index
, c2
->index
))
2939 if (c1
->index
!= c2
->index
)
2950 struct addr_const value1
, value2
;
2952 decode_addr_const (t1
, &value1
);
2953 decode_addr_const (t2
, &value2
);
2954 return (value1
.offset
== value2
.offset
2955 && strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
2961 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
2962 && compare_constant(TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
2966 case NON_LVALUE_EXPR
:
2967 case VIEW_CONVERT_EXPR
:
2968 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
2973 nt1
= lang_hooks
.expand_constant (t1
);
2974 nt2
= lang_hooks
.expand_constant (t2
);
2975 if (nt1
!= t1
|| nt2
!= t2
)
2976 return compare_constant (nt1
, nt2
);
2985 /* Make a copy of the whole tree structure for a constant. This
2986 handles the same types of nodes that compare_constant handles. */
2989 copy_constant (tree exp
)
2991 switch (TREE_CODE (exp
))
2994 /* For ADDR_EXPR, we do not want to copy the decl whose address
2995 is requested. We do want to copy constants though. */
2996 if (CONSTANT_CLASS_P (TREE_OPERAND (exp
, 0)))
2997 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
2998 copy_constant (TREE_OPERAND (exp
, 0)));
3000 return copy_node (exp
);
3005 return copy_node (exp
);
3008 return build_complex (TREE_TYPE (exp
),
3009 copy_constant (TREE_REALPART (exp
)),
3010 copy_constant (TREE_IMAGPART (exp
)));
3014 return build2 (TREE_CODE (exp
), TREE_TYPE (exp
),
3015 copy_constant (TREE_OPERAND (exp
, 0)),
3016 copy_constant (TREE_OPERAND (exp
, 1)));
3020 case NON_LVALUE_EXPR
:
3021 case VIEW_CONVERT_EXPR
:
3022 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3023 copy_constant (TREE_OPERAND (exp
, 0)));
3027 tree copy
= copy_node (exp
);
3028 VEC(constructor_elt
, gc
) *v
;
3029 unsigned HOST_WIDE_INT idx
;
3030 tree purpose
, value
;
3032 v
= VEC_alloc(constructor_elt
, gc
, VEC_length(constructor_elt
,
3033 CONSTRUCTOR_ELTS (exp
)));
3034 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp
), idx
, purpose
, value
)
3036 constructor_elt
*ce
= VEC_quick_push (constructor_elt
, v
, NULL
);
3037 ce
->index
= purpose
;
3038 ce
->value
= copy_constant (value
);
3040 CONSTRUCTOR_ELTS (copy
) = v
;
3046 tree t
= lang_hooks
.expand_constant (exp
);
3048 gcc_assert (t
!= exp
);
3049 return copy_constant (t
);
3054 /* Return the alignment of constant EXP in bits. */
3057 get_constant_alignment (tree exp
)
3061 align
= TYPE_ALIGN (TREE_TYPE (exp
));
3062 #ifdef CONSTANT_ALIGNMENT
3063 align
= CONSTANT_ALIGNMENT (exp
, align
);
3068 /* Return the section into which constant EXP should be placed. */
3071 get_constant_section (tree exp
)
3073 if (IN_NAMED_SECTION (exp
))
3074 return get_named_section (exp
, NULL
, compute_reloc_for_constant (exp
));
3076 return targetm
.asm_out
.select_section (exp
,
3077 compute_reloc_for_constant (exp
),
3078 get_constant_alignment (exp
));
3081 /* Return the size of constant EXP in bytes. */
3083 static HOST_WIDE_INT
3084 get_constant_size (tree exp
)
3088 size
= int_size_in_bytes (TREE_TYPE (exp
));
3089 if (TREE_CODE (exp
) == STRING_CST
)
3090 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3094 /* Subroutine of output_constant_def:
3095 No constant equal to EXP is known to have been output.
3096 Make a constant descriptor to enter EXP in the hash table.
3097 Assign the label number and construct RTL to refer to the
3098 constant's location in memory.
3099 Caller is responsible for updating the hash table. */
3101 static struct constant_descriptor_tree
*
3102 build_constant_desc (tree exp
)
3108 struct constant_descriptor_tree
*desc
;
3110 desc
= ggc_alloc (sizeof (*desc
));
3111 desc
->value
= copy_constant (exp
);
3113 /* Propagate marked-ness to copied constant. */
3114 if (flag_mudflap
&& mf_marked_p (exp
))
3115 mf_mark (desc
->value
);
3117 /* Create a string containing the label name, in LABEL. */
3118 labelno
= const_labelno
++;
3119 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3121 /* We have a symbol name; construct the SYMBOL_REF and the MEM. */
3122 if (use_object_blocks_p ())
3124 section
*sect
= get_constant_section (exp
);
3125 symbol
= create_block_symbol (ggc_strdup (label
),
3126 get_block_for_section (sect
), -1);
3129 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3130 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3131 SET_SYMBOL_REF_DECL (symbol
, desc
->value
);
3132 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3134 rtl
= gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3135 set_mem_attributes (rtl
, exp
, 1);
3136 set_mem_alias_set (rtl
, 0);
3137 set_mem_alias_set (rtl
, const_alias_set
);
3139 /* Set flags or add text to the name to record information, such as
3140 that it is a local symbol. If the name is changed, the macro
3141 ASM_OUTPUT_LABELREF will have to know how to strip this
3142 information. This call might invalidate our local variable
3143 SYMBOL; we can't use it afterward. */
3145 targetm
.encode_section_info (exp
, rtl
, true);
3152 /* Return an rtx representing a reference to constant data in memory
3153 for the constant expression EXP.
3155 If assembler code for such a constant has already been output,
3156 return an rtx to refer to it.
3157 Otherwise, output such a constant in memory
3158 and generate an rtx for it.
3160 If DEFER is nonzero, this constant can be deferred and output only
3161 if referenced in the function after all optimizations.
3163 `const_desc_table' records which constants already have label strings. */
3166 output_constant_def (tree exp
, int defer
)
3168 struct constant_descriptor_tree
*desc
;
3169 struct constant_descriptor_tree key
;
3172 /* Look up EXP in the table of constant descriptors. If we didn't find
3173 it, create a new one. */
3175 key
.hash
= const_hash_1 (exp
);
3176 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3181 desc
= build_constant_desc (exp
);
3182 desc
->hash
= key
.hash
;
3186 maybe_output_constant_def_contents (desc
, defer
);
3190 /* Subroutine of output_constant_def: Decide whether or not we need to
3191 output the constant DESC now, and if so, do it. */
3193 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3196 rtx symbol
= XEXP (desc
->rtl
, 0);
3197 tree exp
= desc
->value
;
3199 if (flag_syntax_only
)
3202 if (TREE_ASM_WRITTEN (exp
))
3203 /* Already output; don't do it again. */
3206 /* We can always defer constants as long as the context allows
3210 /* Increment n_deferred_constants if it exists. It needs to be at
3211 least as large as the number of constants actually referred to
3212 by the function. If it's too small we'll stop looking too early
3213 and fail to emit constants; if it's too large we'll only look
3214 through the entire function when we could have stopped earlier. */
3216 n_deferred_constants
++;
3220 output_constant_def_contents (symbol
);
3223 /* Subroutine of output_constant_def_contents. Output the definition
3224 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3225 constant's alignment in bits. */
3228 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3232 size
= get_constant_size (exp
);
3234 /* Do any machine/system dependent processing of the constant. */
3235 #ifdef ASM_DECLARE_CONSTANT_NAME
3236 ASM_DECLARE_CONSTANT_NAME (asm_out_file
, label
, exp
, size
);
3238 /* Standard thing is just output label for the constant. */
3239 ASM_OUTPUT_LABEL (asm_out_file
, label
);
3240 #endif /* ASM_DECLARE_CONSTANT_NAME */
3242 /* Output the value of EXP. */
3243 output_constant (exp
, size
, align
);
3246 /* We must output the constant data referred to by SYMBOL; do so. */
3249 output_constant_def_contents (rtx symbol
)
3251 tree exp
= SYMBOL_REF_DECL (symbol
);
3254 /* Make sure any other constants whose addresses appear in EXP
3255 are assigned label numbers. */
3256 output_addressed_constants (exp
);
3258 /* We are no longer deferring this constant. */
3259 TREE_ASM_WRITTEN (exp
) = 1;
3261 /* If the constant is part of an object block, make sure that the
3262 decl has been positioned within its block, but do not write out
3263 its definition yet. output_object_blocks will do that later. */
3264 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3265 place_block_symbol (symbol
);
3268 switch_to_section (get_constant_section (exp
));
3269 align
= get_constant_alignment (exp
);
3270 if (align
> BITS_PER_UNIT
)
3271 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3272 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3275 mudflap_enqueue_constant (exp
);
3278 /* Look up EXP in the table of constant descriptors. Return the rtl
3279 if it has been emitted, else null. */
3282 lookup_constant_def (tree exp
)
3284 struct constant_descriptor_tree
*desc
;
3285 struct constant_descriptor_tree key
;
3288 key
.hash
= const_hash_1 (exp
);
3289 desc
= htab_find_with_hash (const_desc_htab
, &key
, key
.hash
);
3291 return (desc
? desc
->rtl
: NULL_RTX
);
3294 /* Used in the hash tables to avoid outputting the same constant
3295 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3296 are output once per function, not once per file. */
3297 /* ??? Only a few targets need per-function constant pools. Most
3298 can use one per-file pool. Should add a targetm bit to tell the
3301 struct rtx_constant_pool
GTY(())
3303 /* Pointers to first and last constant in pool, as ordered by offset. */
3304 struct constant_descriptor_rtx
*first
;
3305 struct constant_descriptor_rtx
*last
;
3307 /* Hash facility for making memory-constants from constant rtl-expressions.
3308 It is used on RISC machines where immediate integer arguments and
3309 constant addresses are restricted so that such constants must be stored
3311 htab_t
GTY((param_is (struct constant_descriptor_rtx
))) const_rtx_htab
;
3313 /* Current offset in constant pool (does not include any
3314 machine-specific header). */
3315 HOST_WIDE_INT offset
;
3318 struct constant_descriptor_rtx
GTY((chain_next ("%h.next")))
3320 struct constant_descriptor_rtx
*next
;
3324 HOST_WIDE_INT offset
;
3326 enum machine_mode mode
;
3332 /* Hash and compare functions for const_rtx_htab. */
3335 const_desc_rtx_hash (const void *ptr
)
3337 const struct constant_descriptor_rtx
*desc
= ptr
;
3342 const_desc_rtx_eq (const void *a
, const void *b
)
3344 const struct constant_descriptor_rtx
*x
= a
;
3345 const struct constant_descriptor_rtx
*y
= b
;
3347 if (x
->mode
!= y
->mode
)
3349 return rtx_equal_p (x
->constant
, y
->constant
);
3352 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3355 const_rtx_hash_1 (rtx
*xp
, void *data
)
3357 unsigned HOST_WIDE_INT hwi
;
3358 enum machine_mode mode
;
3364 code
= GET_CODE (x
);
3365 mode
= GET_MODE (x
);
3366 h
= (hashval_t
) code
* 1048573 + mode
;
3374 const int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3375 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3378 h
^= (hashval_t
) hwi
;
3379 for (i
= 1; i
< n
; ++i
)
3382 h
^= (hashval_t
) hwi
;
3388 if (mode
== VOIDmode
)
3390 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3394 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3400 for (i
= XVECLEN (x
, 0); i
-- > 0; )
3401 h
= h
* 251 + const_rtx_hash_1 (&XVECEXP (x
, 0, i
), data
);
3406 h
^= htab_hash_string (XSTR (x
, 0));
3410 h
= h
* 251 + CODE_LABEL_NUMBER (XEXP (x
, 0));
3414 case UNSPEC_VOLATILE
:
3415 h
= h
* 251 + XINT (x
, 1);
3423 *hp
= *hp
* 509 + h
;
3427 /* Compute a hash value for X, which should be a constant. */
3430 const_rtx_hash (rtx x
)
3433 for_each_rtx (&x
, const_rtx_hash_1
, &h
);
3438 /* Create and return a new rtx constant pool. */
3440 static struct rtx_constant_pool
*
3441 create_constant_pool (void)
3443 struct rtx_constant_pool
*pool
;
3445 pool
= ggc_alloc (sizeof (struct rtx_constant_pool
));
3446 pool
->const_rtx_htab
= htab_create_ggc (31, const_desc_rtx_hash
,
3447 const_desc_rtx_eq
, NULL
);
3454 /* Initialize constant pool hashing for a new function. */
3457 init_varasm_status (struct function
*f
)
3459 struct varasm_status
*p
;
3461 p
= ggc_alloc (sizeof (struct varasm_status
));
3464 p
->pool
= create_constant_pool ();
3465 p
->deferred_constants
= 0;
3468 /* Given a MINUS expression, simplify it if both sides
3469 include the same symbol. */
3472 simplify_subtraction (rtx x
)
3474 rtx r
= simplify_rtx (x
);
3478 /* Given a constant rtx X, make (or find) a memory constant for its value
3479 and return a MEM rtx to refer to it in memory. */
3482 force_const_mem (enum machine_mode mode
, rtx x
)
3484 struct constant_descriptor_rtx
*desc
, tmp
;
3485 struct rtx_constant_pool
*pool
;
3492 /* If we're not allowed to drop X into the constant pool, don't. */
3493 if (targetm
.cannot_force_const_mem (x
))
3496 /* Record that this function has used a constant pool entry. */
3497 current_function_uses_const_pool
= 1;
3499 /* Decide which pool to use. */
3500 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3501 ? shared_constant_pool
3502 : cfun
->varasm
->pool
);
3504 /* Lookup the value in the hashtable. */
3507 hash
= const_rtx_hash (x
);
3508 slot
= htab_find_slot_with_hash (pool
->const_rtx_htab
, &tmp
, hash
, INSERT
);
3511 /* If the constant was already present, return its memory. */
3513 return copy_rtx (desc
->mem
);
3515 /* Otherwise, create a new descriptor. */
3516 desc
= ggc_alloc (sizeof (*desc
));
3519 /* Align the location counter as required by EXP's data type. */
3520 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3521 #ifdef CONSTANT_ALIGNMENT
3523 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3524 if (type
!= NULL_TREE
)
3525 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3529 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3530 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3533 desc
->constant
= tmp
.constant
;
3534 desc
->offset
= pool
->offset
;
3537 desc
->align
= align
;
3538 desc
->labelno
= const_labelno
;
3541 pool
->offset
+= GET_MODE_SIZE (mode
);
3543 pool
->last
->next
= desc
;
3545 pool
->first
= pool
->last
= desc
;
3548 /* Create a string containing the label name, in LABEL. */
3549 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3552 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3553 the constants pool. */
3554 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3556 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3557 symbol
= create_block_symbol (ggc_strdup (label
),
3558 get_block_for_section (sect
), -1);
3561 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3563 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3564 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3565 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3567 /* Construct the MEM. */
3568 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3569 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3570 set_mem_align (def
, align
);
3572 /* If we're dropping a label to the constant pool, make sure we
3574 if (GET_CODE (x
) == LABEL_REF
)
3575 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3577 return copy_rtx (def
);
3580 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3583 get_pool_constant (rtx addr
)
3585 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3588 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3589 and whether it has been output or not. */
3592 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3594 struct constant_descriptor_rtx
*desc
;
3596 desc
= SYMBOL_REF_CONSTANT (addr
);
3597 *pmarked
= (desc
->mark
!= 0);
3598 return desc
->constant
;
3601 /* Similar, return the mode. */
3604 get_pool_mode (rtx addr
)
3606 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3609 /* Return the size of the constant pool. */
3612 get_pool_size (void)
3614 return cfun
->varasm
->pool
->offset
;
3617 /* Worker function for output_constant_pool_1. Emit assembly for X
3618 in MODE with known alignment ALIGN. */
3621 output_constant_pool_2 (enum machine_mode mode
, rtx x
, unsigned int align
)
3623 switch (GET_MODE_CLASS (mode
))
3626 case MODE_DECIMAL_FLOAT
:
3630 gcc_assert (GET_CODE (x
) == CONST_DOUBLE
);
3631 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3632 assemble_real (r
, mode
, align
);
3637 case MODE_PARTIAL_INT
:
3638 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3641 case MODE_VECTOR_FLOAT
:
3642 case MODE_VECTOR_INT
:
3645 enum machine_mode submode
= GET_MODE_INNER (mode
);
3646 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3648 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3649 units
= CONST_VECTOR_NUNITS (x
);
3651 for (i
= 0; i
< units
; i
++)
3653 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3654 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3664 /* Worker function for output_constant_pool. Emit constant DESC,
3665 giving it ALIGN bits of alignment. */
3668 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3675 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3676 whose CODE_LABEL has been deleted. This can occur if a jump table
3677 is eliminated by optimization. If so, write a constant of zero
3678 instead. Note that this can also happen by turning the
3679 CODE_LABEL into a NOTE. */
3680 /* ??? This seems completely and utterly wrong. Certainly it's
3681 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3682 functioning even with INSN_DELETED_P and friends. */
3685 switch (GET_CODE (x
))
3688 if (GET_CODE (XEXP (x
, 0)) != PLUS
3689 || GET_CODE (XEXP (XEXP (x
, 0), 0)) != LABEL_REF
)
3691 tmp
= XEXP (XEXP (x
, 0), 0);
3696 gcc_assert (!INSN_DELETED_P (tmp
));
3697 gcc_assert (!NOTE_P (tmp
)
3698 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3705 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3706 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3707 align
, desc
->labelno
, done
);
3710 assemble_align (align
);
3712 /* Output the label. */
3713 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3715 /* Output the data. */
3716 output_constant_pool_2 (desc
->mode
, x
, align
);
3718 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3719 sections have proper size. */
3720 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3722 && (in_section
->common
.flags
& SECTION_MERGE
))
3723 assemble_align (align
);
3725 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3731 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3732 to as used. Emit referenced deferred strings. This function can
3733 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3736 mark_constant (rtx
*current_rtx
, void *data ATTRIBUTE_UNUSED
)
3738 rtx x
= *current_rtx
;
3740 if (x
== NULL_RTX
|| GET_CODE (x
) != SYMBOL_REF
)
3743 if (CONSTANT_POOL_ADDRESS_P (x
))
3745 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3746 if (desc
->mark
== 0)
3749 for_each_rtx (&desc
->constant
, mark_constant
, NULL
);
3752 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3754 tree exp
= SYMBOL_REF_DECL (x
);
3755 if (!TREE_ASM_WRITTEN (exp
))
3757 n_deferred_constants
--;
3758 output_constant_def_contents (x
);
3765 /* Look through appropriate parts of INSN, marking all entries in the
3766 constant pool which are actually being used. Entries that are only
3767 referenced by other constants are also marked as used. Emit
3768 deferred strings that are used. */
3771 mark_constants (rtx insn
)
3776 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3777 insns, not any notes that may be attached. We don't want to mark
3778 a constant just because it happens to appear in a REG_EQUIV note. */
3779 if (GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3781 rtx seq
= PATTERN (insn
);
3782 int i
, n
= XVECLEN (seq
, 0);
3783 for (i
= 0; i
< n
; ++i
)
3785 rtx subinsn
= XVECEXP (seq
, 0, i
);
3786 if (INSN_P (subinsn
))
3787 for_each_rtx (&PATTERN (subinsn
), mark_constant
, NULL
);
3791 for_each_rtx (&PATTERN (insn
), mark_constant
, NULL
);
3794 /* Look through the instructions for this function, and mark all the
3795 entries in POOL which are actually being used. Emit deferred constants
3796 which have indeed been used. */
3799 mark_constant_pool (void)
3803 if (!current_function_uses_const_pool
&& n_deferred_constants
== 0)
3806 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3807 mark_constants (insn
);
3809 for (link
= current_function_epilogue_delay_list
;
3811 link
= XEXP (link
, 1))
3812 mark_constants (XEXP (link
, 0));
3815 /* Write all the constants in POOL. */
3818 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
3820 struct constant_descriptor_rtx
*desc
;
3822 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3825 /* If the constant is part of an object_block, make sure that
3826 the constant has been positioned within its block, but do not
3827 write out its definition yet. output_object_blocks will do
3829 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
3830 && SYMBOL_REF_BLOCK (desc
->sym
))
3831 place_block_symbol (desc
->sym
);
3834 switch_to_section (targetm
.asm_out
.select_rtx_section
3835 (desc
->mode
, desc
->constant
, desc
->align
));
3836 output_constant_pool_1 (desc
, desc
->align
);
3841 /* Mark all constants that are used in the current function, then write
3842 out the function's private constant pool. */
3845 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
3846 tree fndecl ATTRIBUTE_UNUSED
)
3848 struct rtx_constant_pool
*pool
= cfun
->varasm
->pool
;
3850 /* It is possible for gcc to call force_const_mem and then to later
3851 discard the instructions which refer to the constant. In such a
3852 case we do not need to output the constant. */
3853 mark_constant_pool ();
3855 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3856 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3859 output_constant_pool_contents (pool
);
3861 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3862 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3866 /* Write the contents of the shared constant pool. */
3869 output_shared_constant_pool (void)
3871 output_constant_pool_contents (shared_constant_pool
);
3874 /* Determine what kind of relocations EXP may need. */
3877 compute_reloc_for_constant (tree exp
)
3879 int reloc
= 0, reloc2
;
3882 /* Give the front-end a chance to convert VALUE to something that
3883 looks more like a constant to the back-end. */
3884 exp
= lang_hooks
.expand_constant (exp
);
3886 switch (TREE_CODE (exp
))
3890 /* Go inside any operations that get_inner_reference can handle and see
3891 if what's inside is a constant: no need to do anything here for
3892 addresses of variables or functions. */
3893 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3894 tem
= TREE_OPERAND (tem
, 0))
3897 if (TREE_PUBLIC (tem
))
3904 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3905 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3909 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3910 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3911 /* The difference of two local labels is computable at link time. */
3912 if (reloc
== 1 && reloc2
== 1)
3920 case NON_LVALUE_EXPR
:
3921 case VIEW_CONVERT_EXPR
:
3922 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3927 unsigned HOST_WIDE_INT idx
;
3928 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
3930 reloc
|= compute_reloc_for_constant (tem
);
3940 /* Find all the constants whose addresses are referenced inside of EXP,
3941 and make sure assembler code with a label has been output for each one.
3942 Indicate whether an ADDR_EXPR has been encountered. */
3945 output_addressed_constants (tree exp
)
3949 /* Give the front-end a chance to convert VALUE to something that
3950 looks more like a constant to the back-end. */
3951 exp
= lang_hooks
.expand_constant (exp
);
3953 switch (TREE_CODE (exp
))
3957 /* Go inside any operations that get_inner_reference can handle and see
3958 if what's inside is a constant: no need to do anything here for
3959 addresses of variables or functions. */
3960 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3961 tem
= TREE_OPERAND (tem
, 0))
3964 /* If we have an initialized CONST_DECL, retrieve the initializer. */
3965 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
3966 tem
= DECL_INITIAL (tem
);
3968 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
3969 output_constant_def (tem
, 0);
3974 output_addressed_constants (TREE_OPERAND (exp
, 1));
3979 case NON_LVALUE_EXPR
:
3980 case VIEW_CONVERT_EXPR
:
3981 output_addressed_constants (TREE_OPERAND (exp
, 0));
3986 unsigned HOST_WIDE_INT idx
;
3987 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
3989 output_addressed_constants (tem
);
3998 /* Whether a constructor CTOR is a valid static constant initializer if all
3999 its elements are. This used to be internal to initializer_constant_valid_p
4000 and has been exposed to let other functions like categorize_ctor_elements
4001 evaluate the property while walking a constructor for other purposes. */
4004 constructor_static_from_elts_p (tree ctor
)
4006 return (TREE_CONSTANT (ctor
)
4007 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4008 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
)
4009 && !VEC_empty (constructor_elt
, CONSTRUCTOR_ELTS (ctor
)));
4012 /* Return nonzero if VALUE is a valid constant-valued expression
4013 for use in initializing a static variable; one that can be an
4014 element of a "constant" initializer.
4016 Return null_pointer_node if the value is absolute;
4017 if it is relocatable, return the variable that determines the relocation.
4018 We assume that VALUE has been folded as much as possible;
4019 therefore, we do not need to check for such things as
4020 arithmetic-combinations of integers. */
4023 initializer_constant_valid_p (tree value
, tree endtype
)
4025 /* Give the front-end a chance to convert VALUE to something that
4026 looks more like a constant to the back-end. */
4027 value
= lang_hooks
.expand_constant (value
);
4029 switch (TREE_CODE (value
))
4032 if (constructor_static_from_elts_p (value
))
4034 unsigned HOST_WIDE_INT idx
;
4036 bool absolute
= true;
4038 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4041 reloc
= initializer_constant_valid_p (elt
, TREE_TYPE (elt
));
4044 if (reloc
!= null_pointer_node
)
4047 /* For a non-absolute relocation, there is no single
4048 variable that can be "the variable that determines the
4050 return absolute
? null_pointer_node
: error_mark_node
;
4053 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4060 return null_pointer_node
;
4064 value
= staticp (TREE_OPERAND (value
, 0));
4067 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out to
4068 be a constant, this is old-skool offsetof-like nonsense. */
4069 if (TREE_CODE (value
) == INDIRECT_REF
4070 && TREE_CONSTANT (TREE_OPERAND (value
, 0)))
4071 return null_pointer_node
;
4072 /* Taking the address of a nested function involves a trampoline. */
4073 if (TREE_CODE (value
) == FUNCTION_DECL
4074 && decl_function_context (value
)
4075 && !DECL_NO_STATIC_CHAIN (value
))
4077 /* "&{...}" requires a temporary to hold the constructed
4079 if (TREE_CODE (value
) == CONSTRUCTOR
)
4084 case VIEW_CONVERT_EXPR
:
4085 case NON_LVALUE_EXPR
:
4086 return initializer_constant_valid_p (TREE_OPERAND (value
, 0), endtype
);
4095 src
= TREE_OPERAND (value
, 0);
4096 src_type
= TREE_TYPE (src
);
4097 dest_type
= TREE_TYPE (value
);
4099 /* Allow conversions between pointer types, floating-point
4100 types, and offset types. */
4101 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4102 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4103 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4104 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4105 return initializer_constant_valid_p (src
, endtype
);
4107 /* Allow length-preserving conversions between integer types. */
4108 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4109 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4110 return initializer_constant_valid_p (src
, endtype
);
4112 /* Allow conversions between other integer types only if
4114 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4116 tree inner
= initializer_constant_valid_p (src
, endtype
);
4117 if (inner
== null_pointer_node
)
4118 return null_pointer_node
;
4122 /* Allow (int) &foo provided int is as wide as a pointer. */
4123 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4124 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4125 return initializer_constant_valid_p (src
, endtype
);
4127 /* Likewise conversions from int to pointers, but also allow
4128 conversions from 0. */
4129 if ((POINTER_TYPE_P (dest_type
)
4130 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4131 && INTEGRAL_TYPE_P (src_type
))
4133 if (TREE_CODE (src
) == INTEGER_CST
4134 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4135 return null_pointer_node
;
4136 if (integer_zerop (src
))
4137 return null_pointer_node
;
4138 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4139 return initializer_constant_valid_p (src
, endtype
);
4142 /* Allow conversions to struct or union types if the value
4144 if (TREE_CODE (dest_type
) == RECORD_TYPE
4145 || TREE_CODE (dest_type
) == UNION_TYPE
)
4146 return initializer_constant_valid_p (src
, endtype
);
4151 if (! INTEGRAL_TYPE_P (endtype
)
4152 || TYPE_PRECISION (endtype
) >= POINTER_SIZE
)
4154 tree valid0
= initializer_constant_valid_p (TREE_OPERAND (value
, 0),
4156 tree valid1
= initializer_constant_valid_p (TREE_OPERAND (value
, 1),
4158 /* If either term is absolute, use the other terms relocation. */
4159 if (valid0
== null_pointer_node
)
4161 if (valid1
== null_pointer_node
)
4167 if (! INTEGRAL_TYPE_P (endtype
)
4168 || TYPE_PRECISION (endtype
) >= POINTER_SIZE
)
4170 tree valid0
= initializer_constant_valid_p (TREE_OPERAND (value
, 0),
4172 tree valid1
= initializer_constant_valid_p (TREE_OPERAND (value
, 1),
4174 /* Win if second argument is absolute. */
4175 if (valid1
== null_pointer_node
)
4177 /* Win if both arguments have the same relocation.
4178 Then the value is absolute. */
4179 if (valid0
== valid1
&& valid0
!= 0)
4180 return null_pointer_node
;
4182 /* Since GCC guarantees that string constants are unique in the
4183 generated code, a subtraction between two copies of the same
4184 constant string is absolute. */
4185 if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4186 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4187 && operand_equal_p (valid0
, valid1
, 1))
4188 return null_pointer_node
;
4191 /* Support narrowing differences. */
4192 if (INTEGRAL_TYPE_P (endtype
))
4196 op0
= TREE_OPERAND (value
, 0);
4197 op1
= TREE_OPERAND (value
, 1);
4199 /* Like STRIP_NOPS except allow the operand mode to widen.
4200 This works around a feature of fold that simplifies
4201 (int)(p1 - p2) to ((int)p1 - (int)p2) under the theory
4202 that the narrower operation is cheaper. */
4204 while (TREE_CODE (op0
) == NOP_EXPR
4205 || TREE_CODE (op0
) == CONVERT_EXPR
4206 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4208 tree inner
= TREE_OPERAND (op0
, 0);
4209 if (inner
== error_mark_node
4210 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4211 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4212 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4217 while (TREE_CODE (op1
) == NOP_EXPR
4218 || TREE_CODE (op1
) == CONVERT_EXPR
4219 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4221 tree inner
= TREE_OPERAND (op1
, 0);
4222 if (inner
== error_mark_node
4223 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4224 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4225 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4230 op0
= initializer_constant_valid_p (op0
, endtype
);
4231 op1
= initializer_constant_valid_p (op1
, endtype
);
4233 /* Both initializers must be known. */
4237 return null_pointer_node
;
4239 /* Support differences between labels. */
4240 if (TREE_CODE (op0
) == LABEL_DECL
4241 && TREE_CODE (op1
) == LABEL_DECL
)
4242 return null_pointer_node
;
4244 if (TREE_CODE (op0
) == STRING_CST
4245 && TREE_CODE (op1
) == STRING_CST
4246 && operand_equal_p (op0
, op1
, 1))
4247 return null_pointer_node
;
4259 /* Output assembler code for constant EXP to FILE, with no label.
4260 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4261 Assumes output_addressed_constants has been done on EXP already.
4263 Generate exactly SIZE bytes of assembler data, padding at the end
4264 with zeros if necessary. SIZE must always be specified.
4266 SIZE is important for structure constructors,
4267 since trailing members may have been omitted from the constructor.
4268 It is also important for initialization of arrays from string constants
4269 since the full length of the string constant might not be wanted.
4270 It is also needed for initialization of unions, where the initializer's
4271 type is just one member, and that may not be as long as the union.
4273 There a case in which we would fail to output exactly SIZE bytes:
4274 for a structure constructor that wants to produce more than SIZE bytes.
4275 But such constructors will never be generated for any possible input.
4277 ALIGN is the alignment of the data in bits. */
4280 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4282 enum tree_code code
;
4283 unsigned HOST_WIDE_INT thissize
;
4285 /* Some front-ends use constants other than the standard language-independent
4286 varieties, but which may still be output directly. Give the front-end a
4287 chance to convert EXP to a language-independent representation. */
4288 exp
= lang_hooks
.expand_constant (exp
);
4290 if (size
== 0 || flag_syntax_only
)
4293 /* See if we're trying to initialize a pointer in a non-default mode
4294 to the address of some declaration somewhere. If the target says
4295 the mode is valid for pointers, assume the target has a way of
4297 if (TREE_CODE (exp
) == NOP_EXPR
4298 && POINTER_TYPE_P (TREE_TYPE (exp
))
4299 && targetm
.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp
))))
4301 tree saved_type
= TREE_TYPE (exp
);
4303 /* Peel off any intermediate conversions-to-pointer for valid
4305 while (TREE_CODE (exp
) == NOP_EXPR
4306 && POINTER_TYPE_P (TREE_TYPE (exp
))
4307 && targetm
.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp
))))
4308 exp
= TREE_OPERAND (exp
, 0);
4310 /* If what we're left with is the address of something, we can
4311 convert the address to the final type and output it that
4313 if (TREE_CODE (exp
) == ADDR_EXPR
)
4314 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4315 /* Likewise for constant ints. */
4316 else if (TREE_CODE (exp
) == INTEGER_CST
)
4317 exp
= build_int_cst_wide (saved_type
, TREE_INT_CST_LOW (exp
),
4318 TREE_INT_CST_HIGH (exp
));
4322 /* Eliminate any conversions since we'll be outputting the underlying
4324 while (TREE_CODE (exp
) == NOP_EXPR
|| TREE_CODE (exp
) == CONVERT_EXPR
4325 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4326 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4328 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4329 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4331 /* Make sure eliminating the conversion is really a no-op, except with
4332 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4333 union types to allow for Ada unchecked unions. */
4334 if (type_size
> op_size
4335 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4336 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4337 /* Keep the conversion. */
4340 exp
= TREE_OPERAND (exp
, 0);
4343 code
= TREE_CODE (TREE_TYPE (exp
));
4344 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4346 /* Give the front end another chance to expand constants. */
4347 exp
= lang_hooks
.expand_constant (exp
);
4349 /* Allow a constructor with no elements for any data type.
4350 This means to fill the space with zeros. */
4351 if (TREE_CODE (exp
) == CONSTRUCTOR
4352 && VEC_empty (constructor_elt
, CONSTRUCTOR_ELTS (exp
)))
4354 assemble_zeros (size
);
4358 if (TREE_CODE (exp
) == FDESC_EXPR
)
4360 #ifdef ASM_OUTPUT_FDESC
4361 HOST_WIDE_INT part
= tree_low_cst (TREE_OPERAND (exp
, 1), 0);
4362 tree decl
= TREE_OPERAND (exp
, 0);
4363 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4370 /* Now output the underlying data. If we've handling the padding, return.
4371 Otherwise, break and ensure SIZE is the size written. */
4378 case REFERENCE_TYPE
:
4380 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4381 EXPAND_INITIALIZER
),
4382 MIN (size
, thissize
), align
, 0))
4383 error ("initializer for integer value is too complicated");
4387 if (TREE_CODE (exp
) != REAL_CST
)
4388 error ("initializer for floating value is not a floating constant");
4390 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4394 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4395 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4396 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4401 switch (TREE_CODE (exp
))
4404 output_constructor (exp
, size
, align
);
4407 thissize
= MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
),
4409 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4416 unsigned int nalign
;
4417 enum machine_mode inner
;
4419 inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4420 nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4422 elt_size
= GET_MODE_SIZE (inner
);
4424 link
= TREE_VECTOR_CST_ELTS (exp
);
4425 output_constant (TREE_VALUE (link
), elt_size
, align
);
4426 thissize
= elt_size
;
4427 while ((link
= TREE_CHAIN (link
)) != NULL
)
4429 output_constant (TREE_VALUE (link
), elt_size
, nalign
);
4430 thissize
+= elt_size
;
4441 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4442 output_constructor (exp
, size
, align
);
4452 if (size
> thissize
)
4453 assemble_zeros (size
- thissize
);
4457 /* Subroutine of output_constructor, used for computing the size of
4458 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4459 type with an unspecified upper bound. */
4461 static unsigned HOST_WIDE_INT
4462 array_size_for_constructor (tree val
)
4465 unsigned HOST_WIDE_INT cnt
;
4466 tree index
, value
, tmp
;
4468 /* This code used to attempt to handle string constants that are not
4469 arrays of single-bytes, but nothing else does, so there's no point in
4471 if (TREE_CODE (val
) == STRING_CST
)
4472 return TREE_STRING_LENGTH (val
);
4474 max_index
= NULL_TREE
;
4475 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4477 if (TREE_CODE (index
) == RANGE_EXPR
)
4478 index
= TREE_OPERAND (index
, 1);
4479 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4483 if (max_index
== NULL_TREE
)
4486 /* Compute the total number of array elements. */
4487 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4488 i
= size_binop (MINUS_EXPR
, fold_convert (sizetype
, max_index
),
4489 fold_convert (sizetype
, tmp
));
4490 i
= size_binop (PLUS_EXPR
, i
, build_int_cst (sizetype
, 1));
4492 /* Multiply by the array element unit size to find number of bytes. */
4493 i
= size_binop (MULT_EXPR
, i
, TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4495 return tree_low_cst (i
, 1);
4498 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
4499 Generate at least SIZE bytes, padding if necessary. */
4502 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
4505 tree type
= TREE_TYPE (exp
);
4508 /* Number of bytes output or skipped so far.
4509 In other words, current position within the constructor. */
4510 HOST_WIDE_INT total_bytes
= 0;
4511 /* Nonzero means BYTE contains part of a byte, to be output. */
4512 int byte_buffer_in_use
= 0;
4514 unsigned HOST_WIDE_INT cnt
;
4515 constructor_elt
*ce
;
4517 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
4519 if (TREE_CODE (type
) == RECORD_TYPE
)
4520 field
= TYPE_FIELDS (type
);
4522 if (TREE_CODE (type
) == ARRAY_TYPE
4523 && TYPE_DOMAIN (type
) != 0)
4524 min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (type
));
4526 /* As LINK goes through the elements of the constant,
4527 FIELD goes through the structure fields, if the constant is a structure.
4528 if the constant is a union, then we override this,
4529 by getting the field from the TREE_LIST element.
4530 But the constant could also be an array. Then FIELD is zero.
4532 There is always a maximum of one element in the chain LINK for unions
4533 (even if the initializer in a source program incorrectly contains
4536 VEC_iterate (constructor_elt
, CONSTRUCTOR_ELTS (exp
), cnt
, ce
);
4537 cnt
++, field
= field
? TREE_CHAIN (field
) : 0)
4539 tree val
= ce
->value
;
4542 /* The element in a union constructor specifies the proper field
4544 if ((TREE_CODE (type
) == RECORD_TYPE
|| TREE_CODE (type
) == UNION_TYPE
4545 || TREE_CODE (type
) == QUAL_UNION_TYPE
)
4549 else if (TREE_CODE (type
) == ARRAY_TYPE
)
4552 #ifdef ASM_COMMENT_START
4553 if (field
&& flag_verbose_asm
)
4554 fprintf (asm_out_file
, "%s %s:\n",
4557 ? IDENTIFIER_POINTER (DECL_NAME (field
))
4561 /* Eliminate the marker that makes a cast not be an lvalue. */
4565 if (index
&& TREE_CODE (index
) == RANGE_EXPR
)
4567 unsigned HOST_WIDE_INT fieldsize
4568 = int_size_in_bytes (TREE_TYPE (type
));
4569 HOST_WIDE_INT lo_index
= tree_low_cst (TREE_OPERAND (index
, 0), 0);
4570 HOST_WIDE_INT hi_index
= tree_low_cst (TREE_OPERAND (index
, 1), 0);
4571 HOST_WIDE_INT index
;
4572 unsigned int align2
= min_align (align
, fieldsize
* BITS_PER_UNIT
);
4574 for (index
= lo_index
; index
<= hi_index
; index
++)
4576 /* Output the element's initial value. */
4578 assemble_zeros (fieldsize
);
4580 output_constant (val
, fieldsize
, align2
);
4582 /* Count its size. */
4583 total_bytes
+= fieldsize
;
4586 else if (field
== 0 || !DECL_BIT_FIELD (field
))
4588 /* An element that is not a bit-field. */
4590 unsigned HOST_WIDE_INT fieldsize
;
4591 /* Since this structure is static,
4592 we know the positions are constant. */
4593 HOST_WIDE_INT pos
= field
? int_byte_position (field
) : 0;
4594 unsigned int align2
;
4597 pos
= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (val
)), 1)
4598 * (tree_low_cst (index
, 0) - tree_low_cst (min_index
, 0)));
4600 /* Output any buffered-up bit-fields preceding this element. */
4601 if (byte_buffer_in_use
)
4603 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4605 byte_buffer_in_use
= 0;
4608 /* Advance to offset of this element.
4609 Note no alignment needed in an array, since that is guaranteed
4610 if each element has the proper size. */
4611 if ((field
!= 0 || index
!= 0) && pos
!= total_bytes
)
4613 gcc_assert (pos
>= total_bytes
);
4614 assemble_zeros (pos
- total_bytes
);
4618 /* Find the alignment of this element. */
4619 align2
= min_align (align
, BITS_PER_UNIT
* pos
);
4621 /* Determine size this element should occupy. */
4626 /* If this is an array with an unspecified upper bound,
4627 the initializer determines the size. */
4628 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4629 but we cannot do this until the deprecated support for
4630 initializing zero-length array members is removed. */
4631 if (TREE_CODE (TREE_TYPE (field
)) == ARRAY_TYPE
4632 && TYPE_DOMAIN (TREE_TYPE (field
))
4633 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (field
))))
4635 fieldsize
= array_size_for_constructor (val
);
4636 /* Given a non-empty initialization, this field had
4638 gcc_assert (!fieldsize
|| !TREE_CHAIN (field
));
4640 else if (DECL_SIZE_UNIT (field
))
4642 /* ??? This can't be right. If the decl size overflows
4643 a host integer we will silently emit no data. */
4644 if (host_integerp (DECL_SIZE_UNIT (field
), 1))
4645 fieldsize
= tree_low_cst (DECL_SIZE_UNIT (field
), 1);
4649 fieldsize
= int_size_in_bytes (TREE_TYPE (type
));
4651 /* Output the element's initial value. */
4653 assemble_zeros (fieldsize
);
4655 output_constant (val
, fieldsize
, align2
);
4657 /* Count its size. */
4658 total_bytes
+= fieldsize
;
4660 else if (val
!= 0 && TREE_CODE (val
) != INTEGER_CST
)
4661 error ("invalid initial value for member %qs",
4662 IDENTIFIER_POINTER (DECL_NAME (field
)));
4665 /* Element that is a bit-field. */
4667 HOST_WIDE_INT next_offset
= int_bit_position (field
);
4668 HOST_WIDE_INT end_offset
4669 = (next_offset
+ tree_low_cst (DECL_SIZE (field
), 1));
4672 val
= integer_zero_node
;
4674 /* If this field does not start in this (or, next) byte,
4676 if (next_offset
/ BITS_PER_UNIT
!= total_bytes
)
4678 /* Output remnant of any bit field in previous bytes. */
4679 if (byte_buffer_in_use
)
4681 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4683 byte_buffer_in_use
= 0;
4686 /* If still not at proper byte, advance to there. */
4687 if (next_offset
/ BITS_PER_UNIT
!= total_bytes
)
4689 gcc_assert (next_offset
/ BITS_PER_UNIT
>= total_bytes
);
4690 assemble_zeros (next_offset
/ BITS_PER_UNIT
- total_bytes
);
4691 total_bytes
= next_offset
/ BITS_PER_UNIT
;
4695 if (! byte_buffer_in_use
)
4698 /* We must split the element into pieces that fall within
4699 separate bytes, and combine each byte with previous or
4700 following bit-fields. */
4702 /* next_offset is the offset n fbits from the beginning of
4703 the structure to the next bit of this element to be processed.
4704 end_offset is the offset of the first bit past the end of
4706 while (next_offset
< end_offset
)
4710 HOST_WIDE_INT value
;
4711 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
4712 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
4714 /* Advance from byte to byte
4715 within this element when necessary. */
4716 while (next_byte
!= total_bytes
)
4718 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4723 /* Number of bits we can process at once
4724 (all part of the same byte). */
4725 this_time
= MIN (end_offset
- next_offset
,
4726 BITS_PER_UNIT
- next_bit
);
4727 if (BYTES_BIG_ENDIAN
)
4729 /* On big-endian machine, take the most significant bits
4730 first (of the bits that are significant)
4731 and put them into bytes from the most significant end. */
4732 shift
= end_offset
- next_offset
- this_time
;
4734 /* Don't try to take a bunch of bits that cross
4735 the word boundary in the INTEGER_CST. We can
4736 only select bits from the LOW or HIGH part
4738 if (shift
< HOST_BITS_PER_WIDE_INT
4739 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4741 this_time
= shift
+ this_time
- HOST_BITS_PER_WIDE_INT
;
4742 shift
= HOST_BITS_PER_WIDE_INT
;
4745 /* Now get the bits from the appropriate constant word. */
4746 if (shift
< HOST_BITS_PER_WIDE_INT
)
4747 value
= TREE_INT_CST_LOW (val
);
4750 gcc_assert (shift
< 2 * HOST_BITS_PER_WIDE_INT
);
4751 value
= TREE_INT_CST_HIGH (val
);
4752 shift
-= HOST_BITS_PER_WIDE_INT
;
4755 /* Get the result. This works only when:
4756 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4757 byte
|= (((value
>> shift
)
4758 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
4759 << (BITS_PER_UNIT
- this_time
- next_bit
));
4763 /* On little-endian machines,
4764 take first the least significant bits of the value
4765 and pack them starting at the least significant
4766 bits of the bytes. */
4767 shift
= next_offset
- int_bit_position (field
);
4769 /* Don't try to take a bunch of bits that cross
4770 the word boundary in the INTEGER_CST. We can
4771 only select bits from the LOW or HIGH part
4773 if (shift
< HOST_BITS_PER_WIDE_INT
4774 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4775 this_time
= (HOST_BITS_PER_WIDE_INT
- shift
);
4777 /* Now get the bits from the appropriate constant word. */
4778 if (shift
< HOST_BITS_PER_WIDE_INT
)
4779 value
= TREE_INT_CST_LOW (val
);
4782 gcc_assert (shift
< 2 * HOST_BITS_PER_WIDE_INT
);
4783 value
= TREE_INT_CST_HIGH (val
);
4784 shift
-= HOST_BITS_PER_WIDE_INT
;
4787 /* Get the result. This works only when:
4788 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4789 byte
|= (((value
>> shift
)
4790 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
4794 next_offset
+= this_time
;
4795 byte_buffer_in_use
= 1;
4800 if (byte_buffer_in_use
)
4802 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4806 if ((unsigned HOST_WIDE_INT
)total_bytes
< size
)
4807 assemble_zeros (size
- total_bytes
);
4810 /* This TREE_LIST contains any weak symbol declarations waiting
4812 static GTY(()) tree weak_decls
;
4814 /* Mark DECL as weak. */
4817 mark_weak (tree decl
)
4819 DECL_WEAK (decl
) = 1;
4821 if (DECL_RTL_SET_P (decl
)
4822 && MEM_P (DECL_RTL (decl
))
4823 && XEXP (DECL_RTL (decl
), 0)
4824 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
4825 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
4828 /* Merge weak status between NEWDECL and OLDDECL. */
4831 merge_weak (tree newdecl
, tree olddecl
)
4833 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
4835 if (DECL_WEAK (newdecl
) && SUPPORTS_WEAK
)
4838 /* We put the NEWDECL on the weak_decls list at some point
4839 and OLDDECL as well. Keep just OLDDECL on the list. */
4840 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
4841 if (TREE_VALUE (*pwd
) == newdecl
)
4843 *pwd
= TREE_CHAIN (*pwd
);
4850 if (DECL_WEAK (newdecl
))
4854 /* NEWDECL is weak, but OLDDECL is not. */
4856 /* If we already output the OLDDECL, we're in trouble; we can't
4857 go back and make it weak. This error cannot caught in
4858 declare_weak because the NEWDECL and OLDDECL was not yet
4859 been merged; therefore, TREE_ASM_WRITTEN was not set. */
4860 if (TREE_ASM_WRITTEN (olddecl
))
4861 error ("weak declaration of %q+D must precede definition",
4864 /* If we've already generated rtl referencing OLDDECL, we may
4865 have done so in a way that will not function properly with
4867 else if (TREE_USED (olddecl
)
4868 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)))
4869 warning (0, "weak declaration of %q+D after first use results "
4870 "in unspecified behavior", newdecl
);
4874 /* We put the NEWDECL on the weak_decls list at some point.
4875 Replace it with the OLDDECL. */
4876 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
4877 if (TREE_VALUE (wd
) == newdecl
)
4879 TREE_VALUE (wd
) = olddecl
;
4882 /* We may not find the entry on the list. If NEWDECL is a
4883 weak alias, then we will have already called
4884 globalize_decl to remove the entry; in that case, we do
4885 not need to do anything. */
4888 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
4889 mark_weak (olddecl
);
4892 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
4893 weak. Just update NEWDECL to indicate that it's weak too. */
4894 mark_weak (newdecl
);
4897 /* Declare DECL to be a weak symbol. */
4900 declare_weak (tree decl
)
4902 if (! TREE_PUBLIC (decl
))
4903 error ("weak declaration of %q+D must be public", decl
);
4904 else if (TREE_CODE (decl
) == FUNCTION_DECL
&& TREE_ASM_WRITTEN (decl
))
4905 error ("weak declaration of %q+D must precede definition", decl
);
4906 else if (SUPPORTS_WEAK
)
4908 if (! DECL_WEAK (decl
))
4909 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
4912 warning (0, "weak declaration of %q+D not supported", decl
);
4918 weak_finish_1 (tree decl
)
4920 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
4921 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
4924 if (! TREE_USED (decl
))
4927 #ifdef ASM_WEAKEN_DECL
4928 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
4930 #ifdef ASM_WEAKEN_LABEL
4931 ASM_WEAKEN_LABEL (asm_out_file
, name
);
4933 #ifdef ASM_OUTPUT_WEAK_ALIAS
4935 static bool warn_once
= 0;
4938 warning (0, "only weak aliases are supported in this configuration");
4948 /* This TREE_LIST contains weakref targets. */
4950 static GTY(()) tree weakref_targets
;
4952 /* Forward declaration. */
4953 static tree
find_decl_and_mark_needed (tree decl
, tree target
);
4955 /* Emit any pending weak declarations. */
4962 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
4964 tree alias_decl
= TREE_PURPOSE (t
);
4965 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
4967 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
4968 /* Remove alias_decl from the weak list, but leave entries for
4969 the target alone. */
4971 #ifndef ASM_OUTPUT_WEAKREF
4972 else if (! TREE_SYMBOL_REFERENCED (target
))
4974 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
4975 defined, otherwise we and weak_finish_1 would use a
4976 different macros. */
4977 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
4978 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
4980 tree decl
= find_decl_and_mark_needed (alias_decl
, target
);
4984 decl
= build_decl (TREE_CODE (alias_decl
), target
,
4985 TREE_TYPE (alias_decl
));
4987 DECL_EXTERNAL (decl
) = 1;
4988 TREE_PUBLIC (decl
) = 1;
4989 DECL_ARTIFICIAL (decl
) = 1;
4990 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
4991 TREE_USED (decl
) = 1;
4994 weak_finish_1 (decl
);
5003 /* Remove the alias and the target from the pending weak list
5004 so that we do not emit any .weak directives for the former,
5005 nor multiple .weak directives for the latter. */
5006 for (p
= &weak_decls
; (t2
= *p
) ; )
5008 if (TREE_VALUE (t2
) == alias_decl
5009 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5010 *p
= TREE_CHAIN (t2
);
5012 p
= &TREE_CHAIN (t2
);
5015 /* Remove other weakrefs to the same target, to speed things up. */
5016 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5018 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5019 *p
= TREE_CHAIN (t2
);
5021 p
= &TREE_CHAIN (t2
);
5026 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5028 tree decl
= TREE_VALUE (t
);
5030 weak_finish_1 (decl
);
5034 /* Emit the assembly bits to indicate that DECL is globally visible. */
5037 globalize_decl (tree decl
)
5040 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5041 if (DECL_WEAK (decl
))
5043 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5046 #ifdef ASM_WEAKEN_DECL
5047 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5049 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5052 /* Remove this function from the pending weak list so that
5053 we do not emit multiple .weak directives for it. */
5054 for (p
= &weak_decls
; (t
= *p
) ; )
5056 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5057 *p
= TREE_CHAIN (t
);
5059 p
= &TREE_CHAIN (t
);
5062 /* Remove weakrefs to the same target from the pending weakref
5063 list, for the same reason. */
5064 for (p
= &weakref_targets
; (t
= *p
) ; )
5066 if (DECL_ASSEMBLER_NAME (decl
)
5067 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5068 *p
= TREE_CHAIN (t
);
5070 p
= &TREE_CHAIN (t
);
5077 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5080 /* We have to be able to tell cgraph about the needed-ness of the target
5081 of an alias. This requires that the decl have been defined. Aliases
5082 that precede their definition have to be queued for later processing. */
5084 typedef struct alias_pair
GTY(())
5090 /* Define gc'd vector type. */
5091 DEF_VEC_O(alias_pair
);
5092 DEF_VEC_ALLOC_O(alias_pair
,gc
);
5094 static GTY(()) VEC(alias_pair
,gc
) *alias_pairs
;
5096 /* Given an assembly name, find the decl it is associated with. At the
5097 same time, mark it needed for cgraph. */
5100 find_decl_and_mark_needed (tree decl
, tree target
)
5102 struct cgraph_node
*fnode
= NULL
;
5103 struct varpool_node
*vnode
= NULL
;
5105 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5107 fnode
= cgraph_node_for_asm (target
);
5109 vnode
= varpool_node_for_asm (target
);
5113 vnode
= varpool_node_for_asm (target
);
5115 fnode
= cgraph_node_for_asm (target
);
5120 /* We can't mark function nodes as used after cgraph global info
5121 is finished. This wouldn't generally be necessary, but C++
5122 virtual table thunks are introduced late in the game and
5123 might seem like they need marking, although in fact they
5125 if (! cgraph_global_info_ready
)
5126 cgraph_mark_needed_node (fnode
);
5131 varpool_mark_needed_node (vnode
);
5138 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5139 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5140 tree node is DECL to have the value of the tree node TARGET. */
5143 do_assemble_alias (tree decl
, tree target
)
5145 if (TREE_ASM_WRITTEN (decl
))
5148 TREE_ASM_WRITTEN (decl
) = 1;
5149 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5151 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5153 ultimate_transparent_alias_target (&target
);
5155 if (!targetm
.have_tls
5156 && TREE_CODE (decl
) == VAR_DECL
5157 && DECL_THREAD_LOCAL_P (decl
))
5159 decl
= emutls_decl (decl
);
5160 target
= get_emutls_object_name (target
);
5163 if (!TREE_SYMBOL_REFERENCED (target
))
5164 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5166 #ifdef ASM_OUTPUT_WEAKREF
5167 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5168 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5169 IDENTIFIER_POINTER (target
));
5173 error ("%Jweakref is not supported in this configuration", decl
);
5180 if (!targetm
.have_tls
5181 && TREE_CODE (decl
) == VAR_DECL
5182 && DECL_THREAD_LOCAL_P (decl
))
5184 decl
= emutls_decl (decl
);
5185 target
= get_emutls_object_name (target
);
5188 #ifdef ASM_OUTPUT_DEF
5189 /* Make name accessible from other files, if appropriate. */
5191 if (TREE_PUBLIC (decl
))
5193 globalize_decl (decl
);
5194 maybe_assemble_visibility (decl
);
5197 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5198 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5200 ASM_OUTPUT_DEF (asm_out_file
,
5201 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5202 IDENTIFIER_POINTER (target
));
5204 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5209 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5210 # ifdef ASM_WEAKEN_DECL
5211 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5213 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5215 /* Remove this function from the pending weak list so that
5216 we do not emit multiple .weak directives for it. */
5217 for (p
= &weak_decls
; (t
= *p
) ; )
5218 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5219 *p
= TREE_CHAIN (t
);
5221 p
= &TREE_CHAIN (t
);
5223 /* Remove weakrefs to the same target from the pending weakref
5224 list, for the same reason. */
5225 for (p
= &weakref_targets
; (t
= *p
) ; )
5227 if (DECL_ASSEMBLER_NAME (decl
)
5228 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5229 *p
= TREE_CHAIN (t
);
5231 p
= &TREE_CHAIN (t
);
5237 /* First pass of completing pending aliases. Make sure that cgraph knows
5238 which symbols will be required. */
5241 finish_aliases_1 (void)
5246 for (i
= 0; VEC_iterate (alias_pair
, alias_pairs
, i
, p
); i
++)
5250 target_decl
= find_decl_and_mark_needed (p
->decl
, p
->target
);
5251 if (target_decl
== NULL
)
5253 if (! lookup_attribute ("weakref", DECL_ATTRIBUTES (p
->decl
)))
5254 error ("%q+D aliased to undefined symbol %qs",
5255 p
->decl
, IDENTIFIER_POINTER (p
->target
));
5257 else if (DECL_EXTERNAL (target_decl
)
5258 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p
->decl
)))
5259 error ("%q+D aliased to external symbol %qs",
5260 p
->decl
, IDENTIFIER_POINTER (p
->target
));
5264 /* Second pass of completing pending aliases. Emit the actual assembly.
5265 This happens at the end of compilation and thus it is assured that the
5266 target symbol has been emitted. */
5269 finish_aliases_2 (void)
5274 for (i
= 0; VEC_iterate (alias_pair
, alias_pairs
, i
, p
); i
++)
5275 do_assemble_alias (p
->decl
, p
->target
);
5277 VEC_truncate (alias_pair
, alias_pairs
, 0);
5280 /* Emit an assembler directive to make the symbol for DECL an alias to
5281 the symbol for TARGET. */
5284 assemble_alias (tree decl
, tree target
)
5287 bool is_weakref
= false;
5289 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5291 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5295 ultimate_transparent_alias_target (&target
);
5297 if (alias
== target
)
5298 error ("weakref %q+D ultimately targets itself", decl
);
5301 #ifndef ASM_OUTPUT_WEAKREF
5302 IDENTIFIER_TRANSPARENT_ALIAS (alias
) = 1;
5303 TREE_CHAIN (alias
) = target
;
5306 if (TREE_PUBLIC (decl
))
5307 error ("weakref %q+D must have static linkage", decl
);
5311 #if !defined (ASM_OUTPUT_DEF)
5312 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5313 error ("%Jalias definitions not supported in this configuration", decl
);
5316 if (!DECL_WEAK (decl
))
5318 error ("%Jonly weak aliases are supported in this configuration", decl
);
5325 /* We must force creation of DECL_RTL for debug info generation, even though
5326 we don't use it here. */
5327 make_decl_rtl (decl
);
5328 TREE_USED (decl
) = 1;
5330 /* A quirk of the initial implementation of aliases required that the user
5331 add "extern" to all of them. Which is silly, but now historical. Do
5332 note that the symbol is in fact locally defined. */
5334 DECL_EXTERNAL (decl
) = 0;
5336 /* Allow aliases to aliases. */
5337 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5338 cgraph_node (decl
)->alias
= true;
5340 varpool_node (decl
)->alias
= true;
5342 /* If the target has already been emitted, we don't have to queue the
5343 alias. This saves a tad o memory. */
5344 target_decl
= find_decl_and_mark_needed (decl
, target
);
5345 if (target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5346 do_assemble_alias (decl
, target
);
5349 alias_pair
*p
= VEC_safe_push (alias_pair
, gc
, alias_pairs
, NULL
);
5355 /* Emit an assembler directive to set symbol for DECL visibility to
5356 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5359 default_assemble_visibility (tree decl
, int vis
)
5361 static const char * const visibility_types
[] = {
5362 NULL
, "protected", "hidden", "internal"
5365 const char *name
, *type
;
5367 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5368 type
= visibility_types
[vis
];
5370 #ifdef HAVE_GAS_HIDDEN
5371 fprintf (asm_out_file
, "\t.%s\t", type
);
5372 assemble_name (asm_out_file
, name
);
5373 fprintf (asm_out_file
, "\n");
5375 warning (OPT_Wattributes
, "visibility attribute not supported "
5376 "in this configuration; ignored");
5380 /* A helper function to call assemble_visibility when needed for a decl. */
5383 maybe_assemble_visibility (tree decl
)
5385 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5387 if (vis
!= VISIBILITY_DEFAULT
)
5389 targetm
.asm_out
.visibility (decl
, vis
);
5396 /* Returns 1 if the target configuration supports defining public symbols
5397 so that one of them will be chosen at link time instead of generating a
5398 multiply-defined symbol error, whether through the use of weak symbols or
5399 a target-specific mechanism for having duplicates discarded. */
5402 supports_one_only (void)
5404 if (SUPPORTS_ONE_ONLY
)
5406 return SUPPORTS_WEAK
;
5409 /* Set up DECL as a public symbol that can be defined in multiple
5410 translation units without generating a linker error. */
5413 make_decl_one_only (tree decl
)
5415 gcc_assert (TREE_CODE (decl
) == VAR_DECL
5416 || TREE_CODE (decl
) == FUNCTION_DECL
);
5418 TREE_PUBLIC (decl
) = 1;
5420 if (SUPPORTS_ONE_ONLY
)
5422 #ifdef MAKE_DECL_ONE_ONLY
5423 MAKE_DECL_ONE_ONLY (decl
);
5425 DECL_ONE_ONLY (decl
) = 1;
5427 else if (TREE_CODE (decl
) == VAR_DECL
5428 && (DECL_INITIAL (decl
) == 0 || DECL_INITIAL (decl
) == error_mark_node
))
5429 DECL_COMMON (decl
) = 1;
5432 gcc_assert (SUPPORTS_WEAK
);
5433 DECL_WEAK (decl
) = 1;
5438 init_varasm_once (void)
5440 section_htab
= htab_create_ggc (31, section_entry_hash
,
5441 section_entry_eq
, NULL
);
5442 object_block_htab
= htab_create_ggc (31, object_block_entry_hash
,
5443 object_block_entry_eq
, NULL
);
5444 const_desc_htab
= htab_create_ggc (1009, const_desc_hash
,
5445 const_desc_eq
, NULL
);
5447 const_alias_set
= new_alias_set ();
5448 shared_constant_pool
= create_constant_pool ();
5450 #ifdef TEXT_SECTION_ASM_OP
5451 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
5452 TEXT_SECTION_ASM_OP
);
5455 #ifdef DATA_SECTION_ASM_OP
5456 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5457 DATA_SECTION_ASM_OP
);
5460 #ifdef SDATA_SECTION_ASM_OP
5461 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5462 SDATA_SECTION_ASM_OP
);
5465 #ifdef READONLY_DATA_SECTION_ASM_OP
5466 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
5467 READONLY_DATA_SECTION_ASM_OP
);
5470 #ifdef CTORS_SECTION_ASM_OP
5471 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
5472 CTORS_SECTION_ASM_OP
);
5475 #ifdef DTORS_SECTION_ASM_OP
5476 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
5477 DTORS_SECTION_ASM_OP
);
5480 #ifdef BSS_SECTION_ASM_OP
5481 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5482 output_section_asm_op
,
5483 BSS_SECTION_ASM_OP
);
5486 #ifdef SBSS_SECTION_ASM_OP
5487 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5488 output_section_asm_op
,
5489 SBSS_SECTION_ASM_OP
);
5492 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5493 | SECTION_COMMON
, emit_tls_common
);
5494 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5495 | SECTION_COMMON
, emit_local
);
5496 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5497 | SECTION_COMMON
, emit_common
);
5499 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
5500 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
5504 targetm
.asm_out
.init_sections ();
5506 if (readonly_data_section
== NULL
)
5507 readonly_data_section
= text_section
;
5511 decl_default_tls_model (tree decl
)
5513 enum tls_model kind
;
5516 is_local
= targetm
.binds_local_p (decl
);
5520 kind
= TLS_MODEL_LOCAL_EXEC
;
5522 kind
= TLS_MODEL_INITIAL_EXEC
;
5525 /* Local dynamic is inefficient when we're not combining the
5526 parts of the address. */
5527 else if (optimize
&& is_local
)
5528 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
5530 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
5531 if (kind
< flag_tls_default
)
5532 kind
= flag_tls_default
;
5537 /* Select a set of attributes for section NAME based on the properties
5538 of DECL and whether or not RELOC indicates that DECL's initializer
5539 might contain runtime relocations.
5541 We make the section read-only and executable for a function decl,
5542 read-only for a const data decl, and writable for a non-const data decl. */
5545 default_section_type_flags (tree decl
, const char *name
, int reloc
)
5549 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
5550 flags
= SECTION_CODE
;
5551 else if (decl
&& decl_readonly_section (decl
, reloc
))
5553 else if (current_function_decl
5555 && cfun
->unlikely_text_section_name
5556 && strcmp (name
, cfun
->unlikely_text_section_name
) == 0)
5557 flags
= SECTION_CODE
;
5559 && (!current_function_decl
|| !cfun
)
5560 && strcmp (name
, UNLIKELY_EXECUTED_TEXT_SECTION_NAME
) == 0)
5561 flags
= SECTION_CODE
;
5563 flags
= SECTION_WRITE
;
5565 if (decl
&& DECL_ONE_ONLY (decl
))
5566 flags
|= SECTION_LINKONCE
;
5568 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
5569 flags
|= SECTION_TLS
| SECTION_WRITE
;
5571 if (strcmp (name
, ".bss") == 0
5572 || strncmp (name
, ".bss.", 5) == 0
5573 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
5574 || strcmp (name
, ".sbss") == 0
5575 || strncmp (name
, ".sbss.", 6) == 0
5576 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
5577 flags
|= SECTION_BSS
;
5579 if (strcmp (name
, ".tdata") == 0
5580 || strncmp (name
, ".tdata.", 7) == 0
5581 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
5582 flags
|= SECTION_TLS
;
5584 if (strcmp (name
, ".tbss") == 0
5585 || strncmp (name
, ".tbss.", 6) == 0
5586 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
5587 flags
|= SECTION_TLS
| SECTION_BSS
;
5589 /* These three sections have special ELF types. They are neither
5590 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
5591 want to print a section type (@progbits or @nobits). If someone
5592 is silly enough to emit code or TLS variables to one of these
5593 sections, then don't handle them specially. */
5594 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
5595 && (strcmp (name
, ".init_array") == 0
5596 || strcmp (name
, ".fini_array") == 0
5597 || strcmp (name
, ".preinit_array") == 0))
5598 flags
|= SECTION_NOTYPE
;
5603 /* Return true if the target supports some form of global BSS,
5604 either through bss_noswitch_section, or by selecting a BSS
5605 section in TARGET_ASM_SELECT_SECTION. */
5608 have_global_bss_p (void)
5610 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
5613 /* Output assembly to switch to section NAME with attribute FLAGS.
5614 Four variants for common object file formats. */
5617 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
5618 unsigned int flags ATTRIBUTE_UNUSED
,
5619 tree decl ATTRIBUTE_UNUSED
)
5621 /* Some object formats don't support named sections at all. The
5622 front-end should already have flagged this as an error. */
5627 default_elf_asm_named_section (const char *name
, unsigned int flags
,
5628 tree decl ATTRIBUTE_UNUSED
)
5630 char flagchars
[10], *f
= flagchars
;
5632 /* If we have already declared this section, we can use an
5633 abbreviated form to switch back to it -- unless this section is
5634 part of a COMDAT groups, in which case GAS requires the full
5635 declaration every time. */
5636 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
5637 && (flags
& SECTION_DECLARED
))
5639 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
5643 if (!(flags
& SECTION_DEBUG
))
5645 if (flags
& SECTION_WRITE
)
5647 if (flags
& SECTION_CODE
)
5649 if (flags
& SECTION_SMALL
)
5651 if (flags
& SECTION_MERGE
)
5653 if (flags
& SECTION_STRINGS
)
5655 if (flags
& SECTION_TLS
)
5657 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
5661 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
5663 if (!(flags
& SECTION_NOTYPE
))
5668 if (flags
& SECTION_BSS
)
5674 #ifdef ASM_COMMENT_START
5675 /* On platforms that use "@" as the assembly comment character,
5677 if (strcmp (ASM_COMMENT_START
, "@") == 0)
5680 fprintf (asm_out_file
, format
, type
);
5682 if (flags
& SECTION_ENTSIZE
)
5683 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
5684 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
5685 fprintf (asm_out_file
, ",%s,comdat",
5686 lang_hooks
.decls
.comdat_group (decl
));
5689 putc ('\n', asm_out_file
);
5693 default_coff_asm_named_section (const char *name
, unsigned int flags
,
5694 tree decl ATTRIBUTE_UNUSED
)
5696 char flagchars
[8], *f
= flagchars
;
5698 if (flags
& SECTION_WRITE
)
5700 if (flags
& SECTION_CODE
)
5704 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
5708 default_pe_asm_named_section (const char *name
, unsigned int flags
,
5711 default_coff_asm_named_section (name
, flags
, decl
);
5713 if (flags
& SECTION_LINKONCE
)
5715 /* Functions may have been compiled at various levels of
5716 optimization so we can't use `same_size' here.
5717 Instead, have the linker pick one. */
5718 fprintf (asm_out_file
, "\t.linkonce %s\n",
5719 (flags
& SECTION_CODE
? "discard" : "same_size"));
5723 /* The lame default section selector. */
5726 default_select_section (tree decl
, int reloc
,
5727 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
5731 if (decl_readonly_section (decl
, reloc
))
5732 return readonly_data_section
;
5734 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
5736 if (! ((flag_pic
&& reloc
)
5737 || !TREE_READONLY (decl
)
5738 || TREE_SIDE_EFFECTS (decl
)
5739 || !TREE_CONSTANT (decl
)))
5740 return readonly_data_section
;
5742 else if (TREE_CODE (decl
) == STRING_CST
)
5743 return readonly_data_section
;
5744 else if (! (flag_pic
&& reloc
))
5745 return readonly_data_section
;
5747 return data_section
;
5750 enum section_category
5751 categorize_decl_for_section (tree decl
, int reloc
)
5753 enum section_category ret
;
5755 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5757 else if (TREE_CODE (decl
) == STRING_CST
)
5759 if (flag_mudflap
) /* or !flag_merge_constants */
5760 return SECCAT_RODATA
;
5762 return SECCAT_RODATA_MERGE_STR
;
5764 else if (TREE_CODE (decl
) == VAR_DECL
)
5766 if (bss_initializer_p (decl
))
5768 else if (! TREE_READONLY (decl
)
5769 || TREE_SIDE_EFFECTS (decl
)
5770 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
5772 /* Here the reloc_rw_mask is not testing whether the section should
5773 be read-only or not, but whether the dynamic link will have to
5774 do something. If so, we wish to segregate the data in order to
5775 minimize cache misses inside the dynamic linker. */
5776 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
5777 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
5781 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
5782 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
5783 else if (reloc
|| flag_merge_constants
< 2)
5784 /* C and C++ don't allow different variables to share the same
5785 location. -fmerge-all-constants allows even that (at the
5786 expense of not conforming). */
5787 ret
= SECCAT_RODATA
;
5788 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
5789 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
5791 ret
= SECCAT_RODATA_MERGE_CONST
;
5793 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
5795 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
5796 || TREE_SIDE_EFFECTS (decl
)
5797 || ! TREE_CONSTANT (decl
))
5800 ret
= SECCAT_RODATA
;
5803 ret
= SECCAT_RODATA
;
5805 /* There are no read-only thread-local sections. */
5806 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
5808 /* Note that this would be *just* SECCAT_BSS, except that there's
5809 no concept of a read-only thread-local-data section. */
5810 if (ret
== SECCAT_BSS
5811 || (flag_zero_initialized_in_bss
5812 && initializer_zerop (DECL_INITIAL (decl
))))
5818 /* If the target uses small data sections, select it. */
5819 else if (targetm
.in_small_data_p (decl
))
5821 if (ret
== SECCAT_BSS
)
5823 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
5824 ret
= SECCAT_SRODATA
;
5833 decl_readonly_section (tree decl
, int reloc
)
5835 switch (categorize_decl_for_section (decl
, reloc
))
5838 case SECCAT_RODATA_MERGE_STR
:
5839 case SECCAT_RODATA_MERGE_STR_INIT
:
5840 case SECCAT_RODATA_MERGE_CONST
:
5841 case SECCAT_SRODATA
:
5850 /* Select a section based on the above categorization. */
5853 default_elf_select_section (tree decl
, int reloc
,
5854 unsigned HOST_WIDE_INT align
)
5857 switch (categorize_decl_for_section (decl
, reloc
))
5860 /* We're not supposed to be called on FUNCTION_DECLs. */
5863 return readonly_data_section
;
5864 case SECCAT_RODATA_MERGE_STR
:
5865 return mergeable_string_section (decl
, align
, 0);
5866 case SECCAT_RODATA_MERGE_STR_INIT
:
5867 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
5868 case SECCAT_RODATA_MERGE_CONST
:
5869 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
5870 case SECCAT_SRODATA
:
5874 return data_section
;
5875 case SECCAT_DATA_REL
:
5876 sname
= ".data.rel";
5878 case SECCAT_DATA_REL_LOCAL
:
5879 sname
= ".data.rel.local";
5881 case SECCAT_DATA_REL_RO
:
5882 sname
= ".data.rel.ro";
5884 case SECCAT_DATA_REL_RO_LOCAL
:
5885 sname
= ".data.rel.ro.local";
5910 return get_named_section (decl
, sname
, reloc
);
5913 /* Construct a unique section name based on the decl name and the
5914 categorization performed above. */
5917 default_unique_section (tree decl
, int reloc
)
5919 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
5920 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
5921 const char *prefix
, *name
;
5925 switch (categorize_decl_for_section (decl
, reloc
))
5928 prefix
= one_only
? ".gnu.linkonce.t." : ".text.";
5931 case SECCAT_RODATA_MERGE_STR
:
5932 case SECCAT_RODATA_MERGE_STR_INIT
:
5933 case SECCAT_RODATA_MERGE_CONST
:
5934 prefix
= one_only
? ".gnu.linkonce.r." : ".rodata.";
5936 case SECCAT_SRODATA
:
5937 prefix
= one_only
? ".gnu.linkonce.s2." : ".sdata2.";
5940 prefix
= one_only
? ".gnu.linkonce.d." : ".data.";
5942 case SECCAT_DATA_REL
:
5943 prefix
= one_only
? ".gnu.linkonce.d.rel." : ".data.rel.";
5945 case SECCAT_DATA_REL_LOCAL
:
5946 prefix
= one_only
? ".gnu.linkonce.d.rel.local." : ".data.rel.local.";
5948 case SECCAT_DATA_REL_RO
:
5949 prefix
= one_only
? ".gnu.linkonce.d.rel.ro." : ".data.rel.ro.";
5951 case SECCAT_DATA_REL_RO_LOCAL
:
5952 prefix
= one_only
? ".gnu.linkonce.d.rel.ro.local."
5953 : ".data.rel.ro.local.";
5956 prefix
= one_only
? ".gnu.linkonce.s." : ".sdata.";
5959 prefix
= one_only
? ".gnu.linkonce.b." : ".bss.";
5962 prefix
= one_only
? ".gnu.linkonce.sb." : ".sbss.";
5965 prefix
= one_only
? ".gnu.linkonce.td." : ".tdata.";
5968 prefix
= one_only
? ".gnu.linkonce.tb." : ".tbss.";
5973 plen
= strlen (prefix
);
5975 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5976 name
= targetm
.strip_name_encoding (name
);
5977 nlen
= strlen (name
);
5979 string
= alloca (nlen
+ plen
+ 1);
5980 memcpy (string
, prefix
, plen
);
5981 memcpy (string
+ plen
, name
, nlen
+ 1);
5983 DECL_SECTION_NAME (decl
) = build_string (nlen
+ plen
, string
);
5986 /* Like compute_reloc_for_constant, except for an RTX. The return value
5987 is a mask for which bit 1 indicates a global relocation, and bit 0
5988 indicates a local relocation. */
5991 compute_reloc_for_rtx_1 (rtx
*xp
, void *data
)
5996 switch (GET_CODE (x
))
5999 *preloc
|= SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6012 compute_reloc_for_rtx (rtx x
)
6016 switch (GET_CODE (x
))
6022 for_each_rtx (&x
, compute_reloc_for_rtx_1
, &reloc
);
6031 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
6033 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6035 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6036 return data_section
;
6038 return readonly_data_section
;
6042 default_elf_select_rtx_section (enum machine_mode mode
, rtx x
,
6043 unsigned HOST_WIDE_INT align
)
6045 int reloc
= compute_reloc_for_rtx (x
);
6047 /* ??? Handle small data here somehow. */
6049 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6052 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6054 return get_named_section (NULL
, ".data.rel.ro", 3);
6057 return mergeable_constant_section (mode
, align
, 0);
6060 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6063 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6068 /* Careful not to prod global register variables. */
6071 symbol
= XEXP (rtl
, 0);
6072 if (GET_CODE (symbol
) != SYMBOL_REF
)
6075 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6076 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6077 flags
|= SYMBOL_FLAG_FUNCTION
;
6078 if (targetm
.binds_local_p (decl
))
6079 flags
|= SYMBOL_FLAG_LOCAL
;
6080 if (targetm
.have_tls
&& TREE_CODE (decl
) == VAR_DECL
6081 && DECL_THREAD_LOCAL_P (decl
))
6082 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6083 else if (targetm
.in_small_data_p (decl
))
6084 flags
|= SYMBOL_FLAG_SMALL
;
6085 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6086 being PUBLIC, the thing *must* be defined in this translation unit.
6087 Prevent this buglet from being propagated into rtl code as well. */
6088 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6089 flags
|= SYMBOL_FLAG_EXTERNAL
;
6091 SYMBOL_REF_FLAGS (symbol
) = flags
;
6094 /* By default, we do nothing for encode_section_info, so we need not
6095 do anything but discard the '*' marker. */
6098 default_strip_name_encoding (const char *str
)
6100 return str
+ (*str
== '*');
6103 #ifdef ASM_OUTPUT_DEF
6104 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6105 anchor relative to ".", the current section position. */
6108 default_asm_output_anchor (rtx symbol
)
6112 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6113 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6114 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6118 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6121 default_use_anchors_for_symbol_p (rtx symbol
)
6126 /* Don't use anchors for mergeable sections. The linker might move
6127 the objects around. */
6128 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6129 if (sect
->common
.flags
& SECTION_MERGE
)
6132 /* Don't use anchors for small data sections. The small data register
6133 acts as an anchor for such sections. */
6134 if (sect
->common
.flags
& SECTION_SMALL
)
6137 decl
= SYMBOL_REF_DECL (symbol
);
6138 if (decl
&& DECL_P (decl
))
6140 /* Don't use section anchors for decls that might be defined by
6142 if (!targetm
.binds_local_p (decl
))
6145 /* Don't use section anchors for decls that will be placed in a
6146 small data section. */
6147 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6148 one above. The problem is that we only use SECTION_SMALL for
6149 sections that should be marked as small in the section directive. */
6150 if (targetm
.in_small_data_p (decl
))
6156 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6157 wrt cross-module name binding. */
6160 default_binds_local_p (tree exp
)
6162 return default_binds_local_p_1 (exp
, flag_shlib
);
6166 default_binds_local_p_1 (tree exp
, int shlib
)
6170 /* A non-decl is an entry in the constant pool. */
6173 /* Weakrefs may not bind locally, even though the weakref itself is
6174 always static and therefore local. */
6175 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
)))
6177 /* Static variables are always local. */
6178 else if (! TREE_PUBLIC (exp
))
6180 /* A variable is local if the user has said explicitly that it will
6182 else if (DECL_VISIBILITY_SPECIFIED (exp
)
6183 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6185 /* Variables defined outside this object might not be local. */
6186 else if (DECL_EXTERNAL (exp
))
6188 /* If defined in this object and visibility is not default, must be
6190 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6192 /* Default visibility weak data can be overridden by a strong symbol
6193 in another module and so are not local. */
6194 else if (DECL_WEAK (exp
))
6196 /* If PIC, then assume that any global name can be overridden by
6197 symbols resolved from other modules. */
6200 /* Uninitialized COMMON variable may be unified with symbols
6201 resolved from other modules. */
6202 else if (DECL_COMMON (exp
)
6203 && (DECL_INITIAL (exp
) == NULL
6204 || DECL_INITIAL (exp
) == error_mark_node
))
6206 /* Otherwise we're left with initialized (or non-common) global data
6207 which is of necessity defined locally. */
6214 /* Determine whether or not a pointer mode is valid. Assume defaults
6215 of ptr_mode or Pmode - can be overridden. */
6217 default_valid_pointer_mode (enum machine_mode mode
)
6219 return (mode
== ptr_mode
|| mode
== Pmode
);
6222 /* Default function to output code that will globalize a label. A
6223 target must define GLOBAL_ASM_OP or provide its own function to
6224 globalize a label. */
6225 #ifdef GLOBAL_ASM_OP
6227 default_globalize_label (FILE * stream
, const char *name
)
6229 fputs (GLOBAL_ASM_OP
, stream
);
6230 assemble_name (stream
, name
);
6231 putc ('\n', stream
);
6233 #endif /* GLOBAL_ASM_OP */
6235 /* Default function to output code that will globalize a declaration. */
6237 default_globalize_decl_name (FILE * stream
, tree decl
)
6239 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6240 targetm
.asm_out
.globalize_label (stream
, name
);
6243 /* Default function to output a label for unwind information. The
6244 default is to do nothing. A target that needs nonlocal labels for
6245 unwind information must provide its own function to do this. */
6247 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6248 tree decl ATTRIBUTE_UNUSED
,
6249 int for_eh ATTRIBUTE_UNUSED
,
6250 int empty ATTRIBUTE_UNUSED
)
6254 /* Default function to output a label to divide up the exception table.
6255 The default is to do nothing. A target that needs/wants to divide
6256 up the table must provide it's own function to do this. */
6258 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
6262 /* This is how to output an internal numbered label where PREFIX is
6263 the class of label and LABELNO is the number within the class. */
6266 default_internal_label (FILE *stream
, const char *prefix
,
6267 unsigned long labelno
)
6269 char *const buf
= alloca (40 + strlen (prefix
));
6270 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6271 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
6274 /* This is the default behavior at the beginning of a file. It's
6275 controlled by two other target-hook toggles. */
6277 default_file_start (void)
6279 if (targetm
.file_start_app_off
&& !flag_verbose_asm
)
6280 fputs (ASM_APP_OFF
, asm_out_file
);
6282 if (targetm
.file_start_file_directive
)
6283 output_file_directive (asm_out_file
, main_input_filename
);
6286 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6287 which emits a special section directive used to indicate whether or
6288 not this object file needs an executable stack. This is primarily
6289 a GNU extension to ELF but could be used on other targets. */
6291 int trampolines_created
;
6294 file_end_indicate_exec_stack (void)
6296 unsigned int flags
= SECTION_DEBUG
;
6297 if (trampolines_created
)
6298 flags
|= SECTION_CODE
;
6300 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
6303 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6304 a get_unnamed_section callback. */
6307 output_section_asm_op (const void *directive
)
6309 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
6312 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6313 the current section is NEW_SECTION. */
6316 switch_to_section (section
*new_section
)
6318 if (in_section
== new_section
)
6321 if (new_section
->common
.flags
& SECTION_FORGET
)
6324 in_section
= new_section
;
6326 switch (SECTION_STYLE (new_section
))
6330 && !cfun
->unlikely_text_section_name
6331 && strcmp (new_section
->named
.name
,
6332 UNLIKELY_EXECUTED_TEXT_SECTION_NAME
) == 0)
6333 cfun
->unlikely_text_section_name
= UNLIKELY_EXECUTED_TEXT_SECTION_NAME
;
6335 targetm
.asm_out
.named_section (new_section
->named
.name
,
6336 new_section
->named
.common
.flags
,
6337 new_section
->named
.decl
);
6340 case SECTION_UNNAMED
:
6341 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
6344 case SECTION_NOSWITCH
:
6349 new_section
->common
.flags
|= SECTION_DECLARED
;
6352 /* If block symbol SYMBOL has not yet been assigned an offset, place
6353 it at the end of its block. */
6356 place_block_symbol (rtx symbol
)
6358 unsigned HOST_WIDE_INT size
, mask
, offset
;
6359 struct constant_descriptor_rtx
*desc
;
6360 unsigned int alignment
;
6361 struct object_block
*block
;
6364 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
6365 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
6368 /* Work out the symbol's size and alignment. */
6369 if (CONSTANT_POOL_ADDRESS_P (symbol
))
6371 desc
= SYMBOL_REF_CONSTANT (symbol
);
6372 alignment
= desc
->align
;
6373 size
= GET_MODE_SIZE (desc
->mode
);
6375 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
6377 decl
= SYMBOL_REF_DECL (symbol
);
6378 alignment
= get_constant_alignment (decl
);
6379 size
= get_constant_size (decl
);
6383 decl
= SYMBOL_REF_DECL (symbol
);
6384 alignment
= DECL_ALIGN (decl
);
6385 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
6388 /* Calculate the object's offset from the start of the block. */
6389 block
= SYMBOL_REF_BLOCK (symbol
);
6390 mask
= alignment
/ BITS_PER_UNIT
- 1;
6391 offset
= (block
->size
+ mask
) & ~mask
;
6392 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
6394 /* Record the block's new alignment and size. */
6395 block
->alignment
= MAX (block
->alignment
, alignment
);
6396 block
->size
= offset
+ size
;
6398 VEC_safe_push (rtx
, gc
, block
->objects
, symbol
);
6401 /* Return the anchor that should be used to address byte offset OFFSET
6402 from the first object in BLOCK. MODEL is the TLS model used
6406 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
6407 enum tls_model model
)
6410 unsigned int begin
, middle
, end
;
6411 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
6414 /* Work out the anchor's offset. Use an offset of 0 for the first
6415 anchor so that we don't pessimize the case where we take the address
6416 of a variable at the beginning of the block. This is particularly
6417 useful when a block has only one variable assigned to it.
6419 We try to place anchors RANGE bytes apart, so there can then be
6420 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
6421 a ptr_mode offset. With some target settings, the lowest such
6422 anchor might be out of range for the lowest ptr_mode offset;
6423 likewise the highest anchor for the highest offset. Use anchors
6424 at the extreme ends of the ptr_mode range in such cases.
6426 All arithmetic uses unsigned integers in order to avoid
6428 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
6429 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
6430 range
= max_offset
- min_offset
+ 1;
6435 bias
= 1 << (GET_MODE_BITSIZE (ptr_mode
) - 1);
6438 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
6439 delta
-= delta
% range
;
6442 offset
= (HOST_WIDE_INT
) (-delta
);
6446 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
6447 delta
-= delta
% range
;
6448 if (delta
> bias
- 1)
6450 offset
= (HOST_WIDE_INT
) delta
;
6454 /* Do a binary search to see if there's already an anchor we can use.
6455 Set BEGIN to the new anchor's index if not. */
6457 end
= VEC_length (rtx
, block
->anchors
);
6458 while (begin
!= end
)
6460 middle
= (end
+ begin
) / 2;
6461 anchor
= VEC_index (rtx
, block
->anchors
, middle
);
6462 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
6464 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
6466 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
6468 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
6474 /* Create a new anchor with a unique label. */
6475 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
6476 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
6477 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
6478 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
6480 /* Insert it at index BEGIN. */
6481 VEC_safe_insert (rtx
, gc
, block
->anchors
, begin
, anchor
);
6485 /* Output the objects in BLOCK. */
6488 output_object_block (struct object_block
*block
)
6490 struct constant_descriptor_rtx
*desc
;
6492 HOST_WIDE_INT offset
;
6496 if (block
->objects
== NULL
)
6499 /* Switch to the section and make sure that the first byte is
6500 suitably aligned. */
6501 switch_to_section (block
->sect
);
6502 assemble_align (block
->alignment
);
6504 /* Define the values of all anchors relative to the current section
6506 for (i
= 0; VEC_iterate (rtx
, block
->anchors
, i
, symbol
); i
++)
6507 targetm
.asm_out
.output_anchor (symbol
);
6509 /* Output the objects themselves. */
6511 for (i
= 0; VEC_iterate (rtx
, block
->objects
, i
, symbol
); i
++)
6513 /* Move to the object's offset, padding with zeros if necessary. */
6514 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
6515 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
6516 if (CONSTANT_POOL_ADDRESS_P (symbol
))
6518 desc
= SYMBOL_REF_CONSTANT (symbol
);
6519 output_constant_pool_1 (desc
, 1);
6520 offset
+= GET_MODE_SIZE (desc
->mode
);
6522 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
6524 decl
= SYMBOL_REF_DECL (symbol
);
6525 assemble_constant_contents (decl
, XSTR (symbol
, 0),
6526 get_constant_alignment (decl
));
6527 offset
+= get_constant_size (decl
);
6531 decl
= SYMBOL_REF_DECL (symbol
);
6532 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
6533 offset
+= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
6538 /* A htab_traverse callback used to call output_object_block for
6539 each member of object_block_htab. */
6542 output_object_block_htab (void **slot
, void *data ATTRIBUTE_UNUSED
)
6544 output_object_block ((struct object_block
*) (*slot
));
6548 /* Output the definitions of all object_blocks. */
6551 output_object_blocks (void)
6553 htab_traverse (object_block_htab
, output_object_block_htab
, NULL
);
6556 /* This function provides a possible implementation of the
6557 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
6558 by -frecord-gcc-switches it creates a new mergeable, string section in the
6559 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
6560 contains the switches in ASCII format.
6562 FIXME: This code does not correctly handle double quote characters
6563 that appear inside strings, (it strips them rather than preserving them).
6564 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
6565 characters - instead it treats them as sub-string separators. Since
6566 we want to emit NUL strings terminators into the object file we have to use
6570 elf_record_gcc_switches (print_switch_type type
, const char * name
)
6572 static char buffer
[1024];
6574 /* This variable is used as part of a simplistic heuristic to detect
6575 command line switches which take an argument:
6577 "If a command line option does not start with a dash then
6578 it is an argument for the previous command line option."
6580 This fails in the case of the command line option which is the name
6581 of the file to compile, but otherwise it is pretty reasonable. */
6582 static bool previous_name_held_back
= FALSE
;
6586 case SWITCH_TYPE_PASSED
:
6589 if (previous_name_held_back
)
6591 unsigned int len
= strlen (buffer
);
6593 snprintf (buffer
+ len
, sizeof buffer
- len
, " %s", name
);
6594 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6595 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6596 previous_name_held_back
= FALSE
;
6600 strncpy (buffer
, name
, sizeof buffer
);
6601 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6602 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6607 if (previous_name_held_back
)
6609 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6610 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6613 strncpy (buffer
, name
, sizeof buffer
);
6614 previous_name_held_back
= TRUE
;
6618 case SWITCH_TYPE_DESCRIPTIVE
:
6621 /* Distinguish between invocations where name is NULL. */
6622 static bool started
= false;
6626 if (previous_name_held_back
)
6628 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6629 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6636 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
6640 | (SECTION_ENTSIZE
& 1),
6642 switch_to_section (sec
);
6651 /* The return value is currently ignored by the caller, but must be 0.
6652 For -fverbose-asm the return value would be the number of characters
6653 emitted into the assembler file. */
6657 /* Emit text to declare externally defined symbols. It is needed to
6658 properly support non-default visibility. */
6660 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
6662 const char *name ATTRIBUTE_UNUSED
)
6664 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
6665 set in order to avoid putting out names that are never really
6667 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
6668 && targetm
.binds_local_p (decl
))
6669 maybe_assemble_visibility (decl
);
6672 #include "gt-varasm.h"