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;
2813 case POINTER_PLUS_EXPR
:
2815 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2816 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2820 case NON_LVALUE_EXPR
:
2821 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2824 /* A language specific constant. Just hash the code. */
2828 /* Compute hashing function. */
2830 for (i
= 0; i
< len
; i
++)
2831 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2836 /* Wrapper of compare_constant, for the htab interface. */
2838 const_desc_eq (const void *p1
, const void *p2
)
2840 const struct constant_descriptor_tree
*c1
= p1
;
2841 const struct constant_descriptor_tree
*c2
= p2
;
2842 if (c1
->hash
!= c2
->hash
)
2844 return compare_constant (c1
->value
, c2
->value
);
2847 /* Compare t1 and t2, and return 1 only if they are known to result in
2848 the same bit pattern on output. */
2851 compare_constant (const tree t1
, const tree t2
)
2853 enum tree_code typecode
;
2855 if (t1
== NULL_TREE
)
2856 return t2
== NULL_TREE
;
2857 if (t2
== NULL_TREE
)
2860 if (TREE_CODE (t1
) != TREE_CODE (t2
))
2863 switch (TREE_CODE (t1
))
2866 /* Integer constants are the same only if the same width of type. */
2867 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2869 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2871 return tree_int_cst_equal (t1
, t2
);
2874 /* Real constants are the same only if the same width of type. */
2875 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2878 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
2881 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2884 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
2885 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
2886 TREE_STRING_LENGTH (t1
)));
2889 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
2890 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
2894 VEC(constructor_elt
, gc
) *v1
, *v2
;
2895 unsigned HOST_WIDE_INT idx
;
2897 typecode
= TREE_CODE (TREE_TYPE (t1
));
2898 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
2901 if (typecode
== ARRAY_TYPE
)
2903 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
2904 /* For arrays, check that the sizes all match. */
2905 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
2907 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
2912 /* For record and union constructors, require exact type
2914 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
2918 v1
= CONSTRUCTOR_ELTS (t1
);
2919 v2
= CONSTRUCTOR_ELTS (t2
);
2920 if (VEC_length (constructor_elt
, v1
)
2921 != VEC_length (constructor_elt
, v2
))
2924 for (idx
= 0; idx
< VEC_length (constructor_elt
, v1
); ++idx
)
2926 constructor_elt
*c1
= VEC_index (constructor_elt
, v1
, idx
);
2927 constructor_elt
*c2
= VEC_index (constructor_elt
, v2
, idx
);
2929 /* Check that each value is the same... */
2930 if (!compare_constant (c1
->value
, c2
->value
))
2932 /* ... and that they apply to the same fields! */
2933 if (typecode
== ARRAY_TYPE
)
2935 if (!compare_constant (c1
->index
, c2
->index
))
2940 if (c1
->index
!= c2
->index
)
2951 struct addr_const value1
, value2
;
2953 decode_addr_const (t1
, &value1
);
2954 decode_addr_const (t2
, &value2
);
2955 return (value1
.offset
== value2
.offset
2956 && strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
2960 case POINTER_PLUS_EXPR
:
2963 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
2964 && compare_constant(TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
2968 case NON_LVALUE_EXPR
:
2969 case VIEW_CONVERT_EXPR
:
2970 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
2975 nt1
= lang_hooks
.expand_constant (t1
);
2976 nt2
= lang_hooks
.expand_constant (t2
);
2977 if (nt1
!= t1
|| nt2
!= t2
)
2978 return compare_constant (nt1
, nt2
);
2987 /* Make a copy of the whole tree structure for a constant. This
2988 handles the same types of nodes that compare_constant handles. */
2991 copy_constant (tree exp
)
2993 switch (TREE_CODE (exp
))
2996 /* For ADDR_EXPR, we do not want to copy the decl whose address
2997 is requested. We do want to copy constants though. */
2998 if (CONSTANT_CLASS_P (TREE_OPERAND (exp
, 0)))
2999 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3000 copy_constant (TREE_OPERAND (exp
, 0)));
3002 return copy_node (exp
);
3007 return copy_node (exp
);
3010 return build_complex (TREE_TYPE (exp
),
3011 copy_constant (TREE_REALPART (exp
)),
3012 copy_constant (TREE_IMAGPART (exp
)));
3015 case POINTER_PLUS_EXPR
:
3017 return build2 (TREE_CODE (exp
), TREE_TYPE (exp
),
3018 copy_constant (TREE_OPERAND (exp
, 0)),
3019 copy_constant (TREE_OPERAND (exp
, 1)));
3023 case NON_LVALUE_EXPR
:
3024 case VIEW_CONVERT_EXPR
:
3025 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3026 copy_constant (TREE_OPERAND (exp
, 0)));
3030 tree copy
= copy_node (exp
);
3031 VEC(constructor_elt
, gc
) *v
;
3032 unsigned HOST_WIDE_INT idx
;
3033 tree purpose
, value
;
3035 v
= VEC_alloc(constructor_elt
, gc
, VEC_length(constructor_elt
,
3036 CONSTRUCTOR_ELTS (exp
)));
3037 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp
), idx
, purpose
, value
)
3039 constructor_elt
*ce
= VEC_quick_push (constructor_elt
, v
, NULL
);
3040 ce
->index
= purpose
;
3041 ce
->value
= copy_constant (value
);
3043 CONSTRUCTOR_ELTS (copy
) = v
;
3049 tree t
= lang_hooks
.expand_constant (exp
);
3051 gcc_assert (t
!= exp
);
3052 return copy_constant (t
);
3057 /* Return the alignment of constant EXP in bits. */
3060 get_constant_alignment (tree exp
)
3064 align
= TYPE_ALIGN (TREE_TYPE (exp
));
3065 #ifdef CONSTANT_ALIGNMENT
3066 align
= CONSTANT_ALIGNMENT (exp
, align
);
3071 /* Return the section into which constant EXP should be placed. */
3074 get_constant_section (tree exp
)
3076 if (IN_NAMED_SECTION (exp
))
3077 return get_named_section (exp
, NULL
, compute_reloc_for_constant (exp
));
3079 return targetm
.asm_out
.select_section (exp
,
3080 compute_reloc_for_constant (exp
),
3081 get_constant_alignment (exp
));
3084 /* Return the size of constant EXP in bytes. */
3086 static HOST_WIDE_INT
3087 get_constant_size (tree exp
)
3091 size
= int_size_in_bytes (TREE_TYPE (exp
));
3092 if (TREE_CODE (exp
) == STRING_CST
)
3093 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3097 /* Subroutine of output_constant_def:
3098 No constant equal to EXP is known to have been output.
3099 Make a constant descriptor to enter EXP in the hash table.
3100 Assign the label number and construct RTL to refer to the
3101 constant's location in memory.
3102 Caller is responsible for updating the hash table. */
3104 static struct constant_descriptor_tree
*
3105 build_constant_desc (tree exp
)
3111 struct constant_descriptor_tree
*desc
;
3113 desc
= ggc_alloc (sizeof (*desc
));
3114 desc
->value
= copy_constant (exp
);
3116 /* Propagate marked-ness to copied constant. */
3117 if (flag_mudflap
&& mf_marked_p (exp
))
3118 mf_mark (desc
->value
);
3120 /* Create a string containing the label name, in LABEL. */
3121 labelno
= const_labelno
++;
3122 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3124 /* We have a symbol name; construct the SYMBOL_REF and the MEM. */
3125 if (use_object_blocks_p ())
3127 section
*sect
= get_constant_section (exp
);
3128 symbol
= create_block_symbol (ggc_strdup (label
),
3129 get_block_for_section (sect
), -1);
3132 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3133 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3134 SET_SYMBOL_REF_DECL (symbol
, desc
->value
);
3135 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3137 rtl
= gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3138 set_mem_attributes (rtl
, exp
, 1);
3139 set_mem_alias_set (rtl
, 0);
3140 set_mem_alias_set (rtl
, const_alias_set
);
3142 /* Set flags or add text to the name to record information, such as
3143 that it is a local symbol. If the name is changed, the macro
3144 ASM_OUTPUT_LABELREF will have to know how to strip this
3145 information. This call might invalidate our local variable
3146 SYMBOL; we can't use it afterward. */
3148 targetm
.encode_section_info (exp
, rtl
, true);
3155 /* Return an rtx representing a reference to constant data in memory
3156 for the constant expression EXP.
3158 If assembler code for such a constant has already been output,
3159 return an rtx to refer to it.
3160 Otherwise, output such a constant in memory
3161 and generate an rtx for it.
3163 If DEFER is nonzero, this constant can be deferred and output only
3164 if referenced in the function after all optimizations.
3166 `const_desc_table' records which constants already have label strings. */
3169 output_constant_def (tree exp
, int defer
)
3171 struct constant_descriptor_tree
*desc
;
3172 struct constant_descriptor_tree key
;
3175 /* Look up EXP in the table of constant descriptors. If we didn't find
3176 it, create a new one. */
3178 key
.hash
= const_hash_1 (exp
);
3179 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3184 desc
= build_constant_desc (exp
);
3185 desc
->hash
= key
.hash
;
3189 maybe_output_constant_def_contents (desc
, defer
);
3193 /* Subroutine of output_constant_def: Decide whether or not we need to
3194 output the constant DESC now, and if so, do it. */
3196 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3199 rtx symbol
= XEXP (desc
->rtl
, 0);
3200 tree exp
= desc
->value
;
3202 if (flag_syntax_only
)
3205 if (TREE_ASM_WRITTEN (exp
))
3206 /* Already output; don't do it again. */
3209 /* We can always defer constants as long as the context allows
3213 /* Increment n_deferred_constants if it exists. It needs to be at
3214 least as large as the number of constants actually referred to
3215 by the function. If it's too small we'll stop looking too early
3216 and fail to emit constants; if it's too large we'll only look
3217 through the entire function when we could have stopped earlier. */
3219 n_deferred_constants
++;
3223 output_constant_def_contents (symbol
);
3226 /* Subroutine of output_constant_def_contents. Output the definition
3227 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3228 constant's alignment in bits. */
3231 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3235 size
= get_constant_size (exp
);
3237 /* Do any machine/system dependent processing of the constant. */
3238 #ifdef ASM_DECLARE_CONSTANT_NAME
3239 ASM_DECLARE_CONSTANT_NAME (asm_out_file
, label
, exp
, size
);
3241 /* Standard thing is just output label for the constant. */
3242 ASM_OUTPUT_LABEL (asm_out_file
, label
);
3243 #endif /* ASM_DECLARE_CONSTANT_NAME */
3245 /* Output the value of EXP. */
3246 output_constant (exp
, size
, align
);
3249 /* We must output the constant data referred to by SYMBOL; do so. */
3252 output_constant_def_contents (rtx symbol
)
3254 tree exp
= SYMBOL_REF_DECL (symbol
);
3257 /* Make sure any other constants whose addresses appear in EXP
3258 are assigned label numbers. */
3259 output_addressed_constants (exp
);
3261 /* We are no longer deferring this constant. */
3262 TREE_ASM_WRITTEN (exp
) = 1;
3264 /* If the constant is part of an object block, make sure that the
3265 decl has been positioned within its block, but do not write out
3266 its definition yet. output_object_blocks will do that later. */
3267 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3268 place_block_symbol (symbol
);
3271 switch_to_section (get_constant_section (exp
));
3272 align
= get_constant_alignment (exp
);
3273 if (align
> BITS_PER_UNIT
)
3274 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3275 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3278 mudflap_enqueue_constant (exp
);
3281 /* Look up EXP in the table of constant descriptors. Return the rtl
3282 if it has been emitted, else null. */
3285 lookup_constant_def (tree exp
)
3287 struct constant_descriptor_tree
*desc
;
3288 struct constant_descriptor_tree key
;
3291 key
.hash
= const_hash_1 (exp
);
3292 desc
= htab_find_with_hash (const_desc_htab
, &key
, key
.hash
);
3294 return (desc
? desc
->rtl
: NULL_RTX
);
3297 /* Used in the hash tables to avoid outputting the same constant
3298 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3299 are output once per function, not once per file. */
3300 /* ??? Only a few targets need per-function constant pools. Most
3301 can use one per-file pool. Should add a targetm bit to tell the
3304 struct rtx_constant_pool
GTY(())
3306 /* Pointers to first and last constant in pool, as ordered by offset. */
3307 struct constant_descriptor_rtx
*first
;
3308 struct constant_descriptor_rtx
*last
;
3310 /* Hash facility for making memory-constants from constant rtl-expressions.
3311 It is used on RISC machines where immediate integer arguments and
3312 constant addresses are restricted so that such constants must be stored
3314 htab_t
GTY((param_is (struct constant_descriptor_rtx
))) const_rtx_htab
;
3316 /* Current offset in constant pool (does not include any
3317 machine-specific header). */
3318 HOST_WIDE_INT offset
;
3321 struct constant_descriptor_rtx
GTY((chain_next ("%h.next")))
3323 struct constant_descriptor_rtx
*next
;
3327 HOST_WIDE_INT offset
;
3329 enum machine_mode mode
;
3335 /* Hash and compare functions for const_rtx_htab. */
3338 const_desc_rtx_hash (const void *ptr
)
3340 const struct constant_descriptor_rtx
*desc
= ptr
;
3345 const_desc_rtx_eq (const void *a
, const void *b
)
3347 const struct constant_descriptor_rtx
*x
= a
;
3348 const struct constant_descriptor_rtx
*y
= b
;
3350 if (x
->mode
!= y
->mode
)
3352 return rtx_equal_p (x
->constant
, y
->constant
);
3355 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3358 const_rtx_hash_1 (rtx
*xp
, void *data
)
3360 unsigned HOST_WIDE_INT hwi
;
3361 enum machine_mode mode
;
3367 code
= GET_CODE (x
);
3368 mode
= GET_MODE (x
);
3369 h
= (hashval_t
) code
* 1048573 + mode
;
3377 const int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3378 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3381 h
^= (hashval_t
) hwi
;
3382 for (i
= 1; i
< n
; ++i
)
3385 h
^= (hashval_t
) hwi
;
3391 if (mode
== VOIDmode
)
3393 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3397 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3403 for (i
= XVECLEN (x
, 0); i
-- > 0; )
3404 h
= h
* 251 + const_rtx_hash_1 (&XVECEXP (x
, 0, i
), data
);
3409 h
^= htab_hash_string (XSTR (x
, 0));
3413 h
= h
* 251 + CODE_LABEL_NUMBER (XEXP (x
, 0));
3417 case UNSPEC_VOLATILE
:
3418 h
= h
* 251 + XINT (x
, 1);
3426 *hp
= *hp
* 509 + h
;
3430 /* Compute a hash value for X, which should be a constant. */
3433 const_rtx_hash (rtx x
)
3436 for_each_rtx (&x
, const_rtx_hash_1
, &h
);
3441 /* Create and return a new rtx constant pool. */
3443 static struct rtx_constant_pool
*
3444 create_constant_pool (void)
3446 struct rtx_constant_pool
*pool
;
3448 pool
= ggc_alloc (sizeof (struct rtx_constant_pool
));
3449 pool
->const_rtx_htab
= htab_create_ggc (31, const_desc_rtx_hash
,
3450 const_desc_rtx_eq
, NULL
);
3457 /* Initialize constant pool hashing for a new function. */
3460 init_varasm_status (struct function
*f
)
3462 struct varasm_status
*p
;
3464 p
= ggc_alloc (sizeof (struct varasm_status
));
3467 p
->pool
= create_constant_pool ();
3468 p
->deferred_constants
= 0;
3471 /* Given a MINUS expression, simplify it if both sides
3472 include the same symbol. */
3475 simplify_subtraction (rtx x
)
3477 rtx r
= simplify_rtx (x
);
3481 /* Given a constant rtx X, make (or find) a memory constant for its value
3482 and return a MEM rtx to refer to it in memory. */
3485 force_const_mem (enum machine_mode mode
, rtx x
)
3487 struct constant_descriptor_rtx
*desc
, tmp
;
3488 struct rtx_constant_pool
*pool
;
3495 /* If we're not allowed to drop X into the constant pool, don't. */
3496 if (targetm
.cannot_force_const_mem (x
))
3499 /* Record that this function has used a constant pool entry. */
3500 current_function_uses_const_pool
= 1;
3502 /* Decide which pool to use. */
3503 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3504 ? shared_constant_pool
3505 : cfun
->varasm
->pool
);
3507 /* Lookup the value in the hashtable. */
3510 hash
= const_rtx_hash (x
);
3511 slot
= htab_find_slot_with_hash (pool
->const_rtx_htab
, &tmp
, hash
, INSERT
);
3514 /* If the constant was already present, return its memory. */
3516 return copy_rtx (desc
->mem
);
3518 /* Otherwise, create a new descriptor. */
3519 desc
= ggc_alloc (sizeof (*desc
));
3522 /* Align the location counter as required by EXP's data type. */
3523 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3524 #ifdef CONSTANT_ALIGNMENT
3526 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3527 if (type
!= NULL_TREE
)
3528 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3532 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3533 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3536 desc
->constant
= tmp
.constant
;
3537 desc
->offset
= pool
->offset
;
3540 desc
->align
= align
;
3541 desc
->labelno
= const_labelno
;
3544 pool
->offset
+= GET_MODE_SIZE (mode
);
3546 pool
->last
->next
= desc
;
3548 pool
->first
= pool
->last
= desc
;
3551 /* Create a string containing the label name, in LABEL. */
3552 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3555 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3556 the constants pool. */
3557 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3559 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3560 symbol
= create_block_symbol (ggc_strdup (label
),
3561 get_block_for_section (sect
), -1);
3564 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3566 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3567 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3568 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3570 /* Construct the MEM. */
3571 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3572 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3573 set_mem_align (def
, align
);
3575 /* If we're dropping a label to the constant pool, make sure we
3577 if (GET_CODE (x
) == LABEL_REF
)
3578 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3580 return copy_rtx (def
);
3583 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3586 get_pool_constant (rtx addr
)
3588 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3591 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3592 and whether it has been output or not. */
3595 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3597 struct constant_descriptor_rtx
*desc
;
3599 desc
= SYMBOL_REF_CONSTANT (addr
);
3600 *pmarked
= (desc
->mark
!= 0);
3601 return desc
->constant
;
3604 /* Similar, return the mode. */
3607 get_pool_mode (rtx addr
)
3609 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3612 /* Return the size of the constant pool. */
3615 get_pool_size (void)
3617 return cfun
->varasm
->pool
->offset
;
3620 /* Worker function for output_constant_pool_1. Emit assembly for X
3621 in MODE with known alignment ALIGN. */
3624 output_constant_pool_2 (enum machine_mode mode
, rtx x
, unsigned int align
)
3626 switch (GET_MODE_CLASS (mode
))
3629 case MODE_DECIMAL_FLOAT
:
3633 gcc_assert (GET_CODE (x
) == CONST_DOUBLE
);
3634 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3635 assemble_real (r
, mode
, align
);
3640 case MODE_PARTIAL_INT
:
3641 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3644 case MODE_VECTOR_FLOAT
:
3645 case MODE_VECTOR_INT
:
3648 enum machine_mode submode
= GET_MODE_INNER (mode
);
3649 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3651 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3652 units
= CONST_VECTOR_NUNITS (x
);
3654 for (i
= 0; i
< units
; i
++)
3656 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3657 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3667 /* Worker function for output_constant_pool. Emit constant DESC,
3668 giving it ALIGN bits of alignment. */
3671 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3678 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3679 whose CODE_LABEL has been deleted. This can occur if a jump table
3680 is eliminated by optimization. If so, write a constant of zero
3681 instead. Note that this can also happen by turning the
3682 CODE_LABEL into a NOTE. */
3683 /* ??? This seems completely and utterly wrong. Certainly it's
3684 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3685 functioning even with INSN_DELETED_P and friends. */
3688 switch (GET_CODE (x
))
3691 if (GET_CODE (XEXP (x
, 0)) != PLUS
3692 || GET_CODE (XEXP (XEXP (x
, 0), 0)) != LABEL_REF
)
3694 tmp
= XEXP (XEXP (x
, 0), 0);
3699 gcc_assert (!INSN_DELETED_P (tmp
));
3700 gcc_assert (!NOTE_P (tmp
)
3701 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3708 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3709 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3710 align
, desc
->labelno
, done
);
3713 assemble_align (align
);
3715 /* Output the label. */
3716 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3718 /* Output the data. */
3719 output_constant_pool_2 (desc
->mode
, x
, align
);
3721 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3722 sections have proper size. */
3723 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3725 && (in_section
->common
.flags
& SECTION_MERGE
))
3726 assemble_align (align
);
3728 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3734 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3735 to as used. Emit referenced deferred strings. This function can
3736 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3739 mark_constant (rtx
*current_rtx
, void *data ATTRIBUTE_UNUSED
)
3741 rtx x
= *current_rtx
;
3743 if (x
== NULL_RTX
|| GET_CODE (x
) != SYMBOL_REF
)
3746 if (CONSTANT_POOL_ADDRESS_P (x
))
3748 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3749 if (desc
->mark
== 0)
3752 for_each_rtx (&desc
->constant
, mark_constant
, NULL
);
3755 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3757 tree exp
= SYMBOL_REF_DECL (x
);
3758 if (!TREE_ASM_WRITTEN (exp
))
3760 n_deferred_constants
--;
3761 output_constant_def_contents (x
);
3768 /* Look through appropriate parts of INSN, marking all entries in the
3769 constant pool which are actually being used. Entries that are only
3770 referenced by other constants are also marked as used. Emit
3771 deferred strings that are used. */
3774 mark_constants (rtx insn
)
3779 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3780 insns, not any notes that may be attached. We don't want to mark
3781 a constant just because it happens to appear in a REG_EQUIV note. */
3782 if (GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3784 rtx seq
= PATTERN (insn
);
3785 int i
, n
= XVECLEN (seq
, 0);
3786 for (i
= 0; i
< n
; ++i
)
3788 rtx subinsn
= XVECEXP (seq
, 0, i
);
3789 if (INSN_P (subinsn
))
3790 for_each_rtx (&PATTERN (subinsn
), mark_constant
, NULL
);
3794 for_each_rtx (&PATTERN (insn
), mark_constant
, NULL
);
3797 /* Look through the instructions for this function, and mark all the
3798 entries in POOL which are actually being used. Emit deferred constants
3799 which have indeed been used. */
3802 mark_constant_pool (void)
3806 if (!current_function_uses_const_pool
&& n_deferred_constants
== 0)
3809 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3810 mark_constants (insn
);
3812 for (link
= current_function_epilogue_delay_list
;
3814 link
= XEXP (link
, 1))
3815 mark_constants (XEXP (link
, 0));
3818 /* Write all the constants in POOL. */
3821 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
3823 struct constant_descriptor_rtx
*desc
;
3825 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3828 /* If the constant is part of an object_block, make sure that
3829 the constant has been positioned within its block, but do not
3830 write out its definition yet. output_object_blocks will do
3832 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
3833 && SYMBOL_REF_BLOCK (desc
->sym
))
3834 place_block_symbol (desc
->sym
);
3837 switch_to_section (targetm
.asm_out
.select_rtx_section
3838 (desc
->mode
, desc
->constant
, desc
->align
));
3839 output_constant_pool_1 (desc
, desc
->align
);
3844 /* Mark all constants that are used in the current function, then write
3845 out the function's private constant pool. */
3848 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
3849 tree fndecl ATTRIBUTE_UNUSED
)
3851 struct rtx_constant_pool
*pool
= cfun
->varasm
->pool
;
3853 /* It is possible for gcc to call force_const_mem and then to later
3854 discard the instructions which refer to the constant. In such a
3855 case we do not need to output the constant. */
3856 mark_constant_pool ();
3858 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3859 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3862 output_constant_pool_contents (pool
);
3864 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3865 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3869 /* Write the contents of the shared constant pool. */
3872 output_shared_constant_pool (void)
3874 output_constant_pool_contents (shared_constant_pool
);
3877 /* Determine what kind of relocations EXP may need. */
3880 compute_reloc_for_constant (tree exp
)
3882 int reloc
= 0, reloc2
;
3885 /* Give the front-end a chance to convert VALUE to something that
3886 looks more like a constant to the back-end. */
3887 exp
= lang_hooks
.expand_constant (exp
);
3889 switch (TREE_CODE (exp
))
3893 /* Go inside any operations that get_inner_reference can handle and see
3894 if what's inside is a constant: no need to do anything here for
3895 addresses of variables or functions. */
3896 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3897 tem
= TREE_OPERAND (tem
, 0))
3900 if (TREE_PUBLIC (tem
))
3907 case POINTER_PLUS_EXPR
:
3908 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3909 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3913 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3914 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3915 /* The difference of two local labels is computable at link time. */
3916 if (reloc
== 1 && reloc2
== 1)
3924 case NON_LVALUE_EXPR
:
3925 case VIEW_CONVERT_EXPR
:
3926 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3931 unsigned HOST_WIDE_INT idx
;
3932 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
3934 reloc
|= compute_reloc_for_constant (tem
);
3944 /* Find all the constants whose addresses are referenced inside of EXP,
3945 and make sure assembler code with a label has been output for each one.
3946 Indicate whether an ADDR_EXPR has been encountered. */
3949 output_addressed_constants (tree exp
)
3953 /* Give the front-end a chance to convert VALUE to something that
3954 looks more like a constant to the back-end. */
3955 exp
= lang_hooks
.expand_constant (exp
);
3957 switch (TREE_CODE (exp
))
3961 /* Go inside any operations that get_inner_reference can handle and see
3962 if what's inside is a constant: no need to do anything here for
3963 addresses of variables or functions. */
3964 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3965 tem
= TREE_OPERAND (tem
, 0))
3968 /* If we have an initialized CONST_DECL, retrieve the initializer. */
3969 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
3970 tem
= DECL_INITIAL (tem
);
3972 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
3973 output_constant_def (tem
, 0);
3977 case POINTER_PLUS_EXPR
:
3979 output_addressed_constants (TREE_OPERAND (exp
, 1));
3984 case NON_LVALUE_EXPR
:
3985 case VIEW_CONVERT_EXPR
:
3986 output_addressed_constants (TREE_OPERAND (exp
, 0));
3991 unsigned HOST_WIDE_INT idx
;
3992 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
3994 output_addressed_constants (tem
);
4003 /* Whether a constructor CTOR is a valid static constant initializer if all
4004 its elements are. This used to be internal to initializer_constant_valid_p
4005 and has been exposed to let other functions like categorize_ctor_elements
4006 evaluate the property while walking a constructor for other purposes. */
4009 constructor_static_from_elts_p (tree ctor
)
4011 return (TREE_CONSTANT (ctor
)
4012 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4013 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
)
4014 && !VEC_empty (constructor_elt
, CONSTRUCTOR_ELTS (ctor
)));
4017 /* Return nonzero if VALUE is a valid constant-valued expression
4018 for use in initializing a static variable; one that can be an
4019 element of a "constant" initializer.
4021 Return null_pointer_node if the value is absolute;
4022 if it is relocatable, return the variable that determines the relocation.
4023 We assume that VALUE has been folded as much as possible;
4024 therefore, we do not need to check for such things as
4025 arithmetic-combinations of integers. */
4028 initializer_constant_valid_p (tree value
, tree endtype
)
4030 /* Give the front-end a chance to convert VALUE to something that
4031 looks more like a constant to the back-end. */
4032 value
= lang_hooks
.expand_constant (value
);
4034 switch (TREE_CODE (value
))
4037 if (constructor_static_from_elts_p (value
))
4039 unsigned HOST_WIDE_INT idx
;
4041 bool absolute
= true;
4043 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4046 reloc
= initializer_constant_valid_p (elt
, TREE_TYPE (elt
));
4049 if (reloc
!= null_pointer_node
)
4052 /* For a non-absolute relocation, there is no single
4053 variable that can be "the variable that determines the
4055 return absolute
? null_pointer_node
: error_mark_node
;
4058 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4065 return null_pointer_node
;
4069 value
= staticp (TREE_OPERAND (value
, 0));
4072 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out to
4073 be a constant, this is old-skool offsetof-like nonsense. */
4074 if (TREE_CODE (value
) == INDIRECT_REF
4075 && TREE_CONSTANT (TREE_OPERAND (value
, 0)))
4076 return null_pointer_node
;
4077 /* Taking the address of a nested function involves a trampoline. */
4078 if (TREE_CODE (value
) == FUNCTION_DECL
4079 && decl_function_context (value
)
4080 && !DECL_NO_STATIC_CHAIN (value
))
4082 /* "&{...}" requires a temporary to hold the constructed
4084 if (TREE_CODE (value
) == CONSTRUCTOR
)
4089 case VIEW_CONVERT_EXPR
:
4090 case NON_LVALUE_EXPR
:
4091 return initializer_constant_valid_p (TREE_OPERAND (value
, 0), endtype
);
4100 src
= TREE_OPERAND (value
, 0);
4101 src_type
= TREE_TYPE (src
);
4102 dest_type
= TREE_TYPE (value
);
4104 /* Allow conversions between pointer types, floating-point
4105 types, and offset types. */
4106 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4107 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4108 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4109 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4110 return initializer_constant_valid_p (src
, endtype
);
4112 /* Allow length-preserving conversions between integer types. */
4113 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4114 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4115 return initializer_constant_valid_p (src
, endtype
);
4117 /* Allow conversions between other integer types only if
4119 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4121 tree inner
= initializer_constant_valid_p (src
, endtype
);
4122 if (inner
== null_pointer_node
)
4123 return null_pointer_node
;
4127 /* Allow (int) &foo provided int is as wide as a pointer. */
4128 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4129 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4130 return initializer_constant_valid_p (src
, endtype
);
4132 /* Likewise conversions from int to pointers, but also allow
4133 conversions from 0. */
4134 if ((POINTER_TYPE_P (dest_type
)
4135 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4136 && INTEGRAL_TYPE_P (src_type
))
4138 if (TREE_CODE (src
) == INTEGER_CST
4139 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4140 return null_pointer_node
;
4141 if (integer_zerop (src
))
4142 return null_pointer_node
;
4143 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4144 return initializer_constant_valid_p (src
, endtype
);
4147 /* Allow conversions to struct or union types if the value
4149 if (TREE_CODE (dest_type
) == RECORD_TYPE
4150 || TREE_CODE (dest_type
) == UNION_TYPE
)
4151 return initializer_constant_valid_p (src
, endtype
);
4155 case POINTER_PLUS_EXPR
:
4157 if (! INTEGRAL_TYPE_P (endtype
)
4158 || TYPE_PRECISION (endtype
) >= POINTER_SIZE
)
4160 tree valid0
= initializer_constant_valid_p (TREE_OPERAND (value
, 0),
4162 tree valid1
= initializer_constant_valid_p (TREE_OPERAND (value
, 1),
4164 /* If either term is absolute, use the other terms relocation. */
4165 if (valid0
== null_pointer_node
)
4167 if (valid1
== null_pointer_node
)
4173 if (! INTEGRAL_TYPE_P (endtype
)
4174 || TYPE_PRECISION (endtype
) >= POINTER_SIZE
)
4176 tree valid0
= initializer_constant_valid_p (TREE_OPERAND (value
, 0),
4178 tree valid1
= initializer_constant_valid_p (TREE_OPERAND (value
, 1),
4180 /* Win if second argument is absolute. */
4181 if (valid1
== null_pointer_node
)
4183 /* Win if both arguments have the same relocation.
4184 Then the value is absolute. */
4185 if (valid0
== valid1
&& valid0
!= 0)
4186 return null_pointer_node
;
4188 /* Since GCC guarantees that string constants are unique in the
4189 generated code, a subtraction between two copies of the same
4190 constant string is absolute. */
4191 if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4192 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4193 && operand_equal_p (valid0
, valid1
, 1))
4194 return null_pointer_node
;
4197 /* Support narrowing differences. */
4198 if (INTEGRAL_TYPE_P (endtype
))
4202 op0
= TREE_OPERAND (value
, 0);
4203 op1
= TREE_OPERAND (value
, 1);
4205 /* Like STRIP_NOPS except allow the operand mode to widen.
4206 This works around a feature of fold that simplifies
4207 (int)(p1 - p2) to ((int)p1 - (int)p2) under the theory
4208 that the narrower operation is cheaper. */
4210 while (TREE_CODE (op0
) == NOP_EXPR
4211 || TREE_CODE (op0
) == CONVERT_EXPR
4212 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4214 tree inner
= TREE_OPERAND (op0
, 0);
4215 if (inner
== error_mark_node
4216 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4217 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4218 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4223 while (TREE_CODE (op1
) == NOP_EXPR
4224 || TREE_CODE (op1
) == CONVERT_EXPR
4225 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4227 tree inner
= TREE_OPERAND (op1
, 0);
4228 if (inner
== error_mark_node
4229 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4230 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4231 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4236 op0
= initializer_constant_valid_p (op0
, endtype
);
4237 op1
= initializer_constant_valid_p (op1
, endtype
);
4239 /* Both initializers must be known. */
4243 return null_pointer_node
;
4245 /* Support differences between labels. */
4246 if (TREE_CODE (op0
) == LABEL_DECL
4247 && TREE_CODE (op1
) == LABEL_DECL
)
4248 return null_pointer_node
;
4250 if (TREE_CODE (op0
) == STRING_CST
4251 && TREE_CODE (op1
) == STRING_CST
4252 && operand_equal_p (op0
, op1
, 1))
4253 return null_pointer_node
;
4265 /* Output assembler code for constant EXP to FILE, with no label.
4266 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4267 Assumes output_addressed_constants has been done on EXP already.
4269 Generate exactly SIZE bytes of assembler data, padding at the end
4270 with zeros if necessary. SIZE must always be specified.
4272 SIZE is important for structure constructors,
4273 since trailing members may have been omitted from the constructor.
4274 It is also important for initialization of arrays from string constants
4275 since the full length of the string constant might not be wanted.
4276 It is also needed for initialization of unions, where the initializer's
4277 type is just one member, and that may not be as long as the union.
4279 There a case in which we would fail to output exactly SIZE bytes:
4280 for a structure constructor that wants to produce more than SIZE bytes.
4281 But such constructors will never be generated for any possible input.
4283 ALIGN is the alignment of the data in bits. */
4286 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4288 enum tree_code code
;
4289 unsigned HOST_WIDE_INT thissize
;
4291 /* Some front-ends use constants other than the standard language-independent
4292 varieties, but which may still be output directly. Give the front-end a
4293 chance to convert EXP to a language-independent representation. */
4294 exp
= lang_hooks
.expand_constant (exp
);
4296 if (size
== 0 || flag_syntax_only
)
4299 /* See if we're trying to initialize a pointer in a non-default mode
4300 to the address of some declaration somewhere. If the target says
4301 the mode is valid for pointers, assume the target has a way of
4303 if (TREE_CODE (exp
) == NOP_EXPR
4304 && POINTER_TYPE_P (TREE_TYPE (exp
))
4305 && targetm
.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp
))))
4307 tree saved_type
= TREE_TYPE (exp
);
4309 /* Peel off any intermediate conversions-to-pointer for valid
4311 while (TREE_CODE (exp
) == NOP_EXPR
4312 && POINTER_TYPE_P (TREE_TYPE (exp
))
4313 && targetm
.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp
))))
4314 exp
= TREE_OPERAND (exp
, 0);
4316 /* If what we're left with is the address of something, we can
4317 convert the address to the final type and output it that
4319 if (TREE_CODE (exp
) == ADDR_EXPR
)
4320 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4321 /* Likewise for constant ints. */
4322 else if (TREE_CODE (exp
) == INTEGER_CST
)
4323 exp
= build_int_cst_wide (saved_type
, TREE_INT_CST_LOW (exp
),
4324 TREE_INT_CST_HIGH (exp
));
4328 /* Eliminate any conversions since we'll be outputting the underlying
4330 while (TREE_CODE (exp
) == NOP_EXPR
|| TREE_CODE (exp
) == CONVERT_EXPR
4331 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4332 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4334 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4335 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4337 /* Make sure eliminating the conversion is really a no-op, except with
4338 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4339 union types to allow for Ada unchecked unions. */
4340 if (type_size
> op_size
4341 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4342 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4343 /* Keep the conversion. */
4346 exp
= TREE_OPERAND (exp
, 0);
4349 code
= TREE_CODE (TREE_TYPE (exp
));
4350 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4352 /* Give the front end another chance to expand constants. */
4353 exp
= lang_hooks
.expand_constant (exp
);
4355 /* Allow a constructor with no elements for any data type.
4356 This means to fill the space with zeros. */
4357 if (TREE_CODE (exp
) == CONSTRUCTOR
4358 && VEC_empty (constructor_elt
, CONSTRUCTOR_ELTS (exp
)))
4360 assemble_zeros (size
);
4364 if (TREE_CODE (exp
) == FDESC_EXPR
)
4366 #ifdef ASM_OUTPUT_FDESC
4367 HOST_WIDE_INT part
= tree_low_cst (TREE_OPERAND (exp
, 1), 0);
4368 tree decl
= TREE_OPERAND (exp
, 0);
4369 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4376 /* Now output the underlying data. If we've handling the padding, return.
4377 Otherwise, break and ensure SIZE is the size written. */
4384 case REFERENCE_TYPE
:
4386 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4387 EXPAND_INITIALIZER
),
4388 MIN (size
, thissize
), align
, 0))
4389 error ("initializer for integer value is too complicated");
4393 if (TREE_CODE (exp
) != REAL_CST
)
4394 error ("initializer for floating value is not a floating constant");
4396 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4400 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4401 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4402 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4407 switch (TREE_CODE (exp
))
4410 output_constructor (exp
, size
, align
);
4413 thissize
= MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
),
4415 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4422 unsigned int nalign
;
4423 enum machine_mode inner
;
4425 inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4426 nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4428 elt_size
= GET_MODE_SIZE (inner
);
4430 link
= TREE_VECTOR_CST_ELTS (exp
);
4431 output_constant (TREE_VALUE (link
), elt_size
, align
);
4432 thissize
= elt_size
;
4433 while ((link
= TREE_CHAIN (link
)) != NULL
)
4435 output_constant (TREE_VALUE (link
), elt_size
, nalign
);
4436 thissize
+= elt_size
;
4447 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4448 output_constructor (exp
, size
, align
);
4458 if (size
> thissize
)
4459 assemble_zeros (size
- thissize
);
4463 /* Subroutine of output_constructor, used for computing the size of
4464 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4465 type with an unspecified upper bound. */
4467 static unsigned HOST_WIDE_INT
4468 array_size_for_constructor (tree val
)
4471 unsigned HOST_WIDE_INT cnt
;
4472 tree index
, value
, tmp
;
4474 /* This code used to attempt to handle string constants that are not
4475 arrays of single-bytes, but nothing else does, so there's no point in
4477 if (TREE_CODE (val
) == STRING_CST
)
4478 return TREE_STRING_LENGTH (val
);
4480 max_index
= NULL_TREE
;
4481 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4483 if (TREE_CODE (index
) == RANGE_EXPR
)
4484 index
= TREE_OPERAND (index
, 1);
4485 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4489 if (max_index
== NULL_TREE
)
4492 /* Compute the total number of array elements. */
4493 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4494 i
= size_binop (MINUS_EXPR
, fold_convert (sizetype
, max_index
),
4495 fold_convert (sizetype
, tmp
));
4496 i
= size_binop (PLUS_EXPR
, i
, build_int_cst (sizetype
, 1));
4498 /* Multiply by the array element unit size to find number of bytes. */
4499 i
= size_binop (MULT_EXPR
, i
, TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4501 return tree_low_cst (i
, 1);
4504 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
4505 Generate at least SIZE bytes, padding if necessary. */
4508 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
4511 tree type
= TREE_TYPE (exp
);
4514 /* Number of bytes output or skipped so far.
4515 In other words, current position within the constructor. */
4516 HOST_WIDE_INT total_bytes
= 0;
4517 /* Nonzero means BYTE contains part of a byte, to be output. */
4518 int byte_buffer_in_use
= 0;
4520 unsigned HOST_WIDE_INT cnt
;
4521 constructor_elt
*ce
;
4523 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
4525 if (TREE_CODE (type
) == RECORD_TYPE
)
4526 field
= TYPE_FIELDS (type
);
4528 if (TREE_CODE (type
) == ARRAY_TYPE
4529 && TYPE_DOMAIN (type
) != 0)
4530 min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (type
));
4532 /* As LINK goes through the elements of the constant,
4533 FIELD goes through the structure fields, if the constant is a structure.
4534 if the constant is a union, then we override this,
4535 by getting the field from the TREE_LIST element.
4536 But the constant could also be an array. Then FIELD is zero.
4538 There is always a maximum of one element in the chain LINK for unions
4539 (even if the initializer in a source program incorrectly contains
4542 VEC_iterate (constructor_elt
, CONSTRUCTOR_ELTS (exp
), cnt
, ce
);
4543 cnt
++, field
= field
? TREE_CHAIN (field
) : 0)
4545 tree val
= ce
->value
;
4548 /* The element in a union constructor specifies the proper field
4550 if ((TREE_CODE (type
) == RECORD_TYPE
|| TREE_CODE (type
) == UNION_TYPE
4551 || TREE_CODE (type
) == QUAL_UNION_TYPE
)
4555 else if (TREE_CODE (type
) == ARRAY_TYPE
)
4558 #ifdef ASM_COMMENT_START
4559 if (field
&& flag_verbose_asm
)
4560 fprintf (asm_out_file
, "%s %s:\n",
4563 ? IDENTIFIER_POINTER (DECL_NAME (field
))
4567 /* Eliminate the marker that makes a cast not be an lvalue. */
4571 if (index
&& TREE_CODE (index
) == RANGE_EXPR
)
4573 unsigned HOST_WIDE_INT fieldsize
4574 = int_size_in_bytes (TREE_TYPE (type
));
4575 HOST_WIDE_INT lo_index
= tree_low_cst (TREE_OPERAND (index
, 0), 0);
4576 HOST_WIDE_INT hi_index
= tree_low_cst (TREE_OPERAND (index
, 1), 0);
4577 HOST_WIDE_INT index
;
4578 unsigned int align2
= min_align (align
, fieldsize
* BITS_PER_UNIT
);
4580 for (index
= lo_index
; index
<= hi_index
; index
++)
4582 /* Output the element's initial value. */
4584 assemble_zeros (fieldsize
);
4586 output_constant (val
, fieldsize
, align2
);
4588 /* Count its size. */
4589 total_bytes
+= fieldsize
;
4592 else if (field
== 0 || !DECL_BIT_FIELD (field
))
4594 /* An element that is not a bit-field. */
4596 unsigned HOST_WIDE_INT fieldsize
;
4597 /* Since this structure is static,
4598 we know the positions are constant. */
4599 HOST_WIDE_INT pos
= field
? int_byte_position (field
) : 0;
4600 unsigned int align2
;
4603 pos
= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (val
)), 1)
4604 * (tree_low_cst (index
, 0) - tree_low_cst (min_index
, 0)));
4606 /* Output any buffered-up bit-fields preceding this element. */
4607 if (byte_buffer_in_use
)
4609 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4611 byte_buffer_in_use
= 0;
4614 /* Advance to offset of this element.
4615 Note no alignment needed in an array, since that is guaranteed
4616 if each element has the proper size. */
4617 if ((field
!= 0 || index
!= 0) && pos
!= total_bytes
)
4619 gcc_assert (pos
>= total_bytes
);
4620 assemble_zeros (pos
- total_bytes
);
4624 /* Find the alignment of this element. */
4625 align2
= min_align (align
, BITS_PER_UNIT
* pos
);
4627 /* Determine size this element should occupy. */
4632 /* If this is an array with an unspecified upper bound,
4633 the initializer determines the size. */
4634 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4635 but we cannot do this until the deprecated support for
4636 initializing zero-length array members is removed. */
4637 if (TREE_CODE (TREE_TYPE (field
)) == ARRAY_TYPE
4638 && TYPE_DOMAIN (TREE_TYPE (field
))
4639 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (field
))))
4641 fieldsize
= array_size_for_constructor (val
);
4642 /* Given a non-empty initialization, this field had
4644 gcc_assert (!fieldsize
|| !TREE_CHAIN (field
));
4646 else if (DECL_SIZE_UNIT (field
))
4648 /* ??? This can't be right. If the decl size overflows
4649 a host integer we will silently emit no data. */
4650 if (host_integerp (DECL_SIZE_UNIT (field
), 1))
4651 fieldsize
= tree_low_cst (DECL_SIZE_UNIT (field
), 1);
4655 fieldsize
= int_size_in_bytes (TREE_TYPE (type
));
4657 /* Output the element's initial value. */
4659 assemble_zeros (fieldsize
);
4661 output_constant (val
, fieldsize
, align2
);
4663 /* Count its size. */
4664 total_bytes
+= fieldsize
;
4666 else if (val
!= 0 && TREE_CODE (val
) != INTEGER_CST
)
4667 error ("invalid initial value for member %qs",
4668 IDENTIFIER_POINTER (DECL_NAME (field
)));
4671 /* Element that is a bit-field. */
4673 HOST_WIDE_INT next_offset
= int_bit_position (field
);
4674 HOST_WIDE_INT end_offset
4675 = (next_offset
+ tree_low_cst (DECL_SIZE (field
), 1));
4678 val
= integer_zero_node
;
4680 /* If this field does not start in this (or, next) byte,
4682 if (next_offset
/ BITS_PER_UNIT
!= total_bytes
)
4684 /* Output remnant of any bit field in previous bytes. */
4685 if (byte_buffer_in_use
)
4687 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4689 byte_buffer_in_use
= 0;
4692 /* If still not at proper byte, advance to there. */
4693 if (next_offset
/ BITS_PER_UNIT
!= total_bytes
)
4695 gcc_assert (next_offset
/ BITS_PER_UNIT
>= total_bytes
);
4696 assemble_zeros (next_offset
/ BITS_PER_UNIT
- total_bytes
);
4697 total_bytes
= next_offset
/ BITS_PER_UNIT
;
4701 if (! byte_buffer_in_use
)
4704 /* We must split the element into pieces that fall within
4705 separate bytes, and combine each byte with previous or
4706 following bit-fields. */
4708 /* next_offset is the offset n fbits from the beginning of
4709 the structure to the next bit of this element to be processed.
4710 end_offset is the offset of the first bit past the end of
4712 while (next_offset
< end_offset
)
4716 HOST_WIDE_INT value
;
4717 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
4718 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
4720 /* Advance from byte to byte
4721 within this element when necessary. */
4722 while (next_byte
!= total_bytes
)
4724 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4729 /* Number of bits we can process at once
4730 (all part of the same byte). */
4731 this_time
= MIN (end_offset
- next_offset
,
4732 BITS_PER_UNIT
- next_bit
);
4733 if (BYTES_BIG_ENDIAN
)
4735 /* On big-endian machine, take the most significant bits
4736 first (of the bits that are significant)
4737 and put them into bytes from the most significant end. */
4738 shift
= end_offset
- next_offset
- this_time
;
4740 /* Don't try to take a bunch of bits that cross
4741 the word boundary in the INTEGER_CST. We can
4742 only select bits from the LOW or HIGH part
4744 if (shift
< HOST_BITS_PER_WIDE_INT
4745 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4747 this_time
= shift
+ this_time
- HOST_BITS_PER_WIDE_INT
;
4748 shift
= HOST_BITS_PER_WIDE_INT
;
4751 /* Now get the bits from the appropriate constant word. */
4752 if (shift
< HOST_BITS_PER_WIDE_INT
)
4753 value
= TREE_INT_CST_LOW (val
);
4756 gcc_assert (shift
< 2 * HOST_BITS_PER_WIDE_INT
);
4757 value
= TREE_INT_CST_HIGH (val
);
4758 shift
-= HOST_BITS_PER_WIDE_INT
;
4761 /* Get the result. This works only when:
4762 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4763 byte
|= (((value
>> shift
)
4764 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
4765 << (BITS_PER_UNIT
- this_time
- next_bit
));
4769 /* On little-endian machines,
4770 take first the least significant bits of the value
4771 and pack them starting at the least significant
4772 bits of the bytes. */
4773 shift
= next_offset
- int_bit_position (field
);
4775 /* Don't try to take a bunch of bits that cross
4776 the word boundary in the INTEGER_CST. We can
4777 only select bits from the LOW or HIGH part
4779 if (shift
< HOST_BITS_PER_WIDE_INT
4780 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4781 this_time
= (HOST_BITS_PER_WIDE_INT
- shift
);
4783 /* Now get the bits from the appropriate constant word. */
4784 if (shift
< HOST_BITS_PER_WIDE_INT
)
4785 value
= TREE_INT_CST_LOW (val
);
4788 gcc_assert (shift
< 2 * HOST_BITS_PER_WIDE_INT
);
4789 value
= TREE_INT_CST_HIGH (val
);
4790 shift
-= HOST_BITS_PER_WIDE_INT
;
4793 /* Get the result. This works only when:
4794 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4795 byte
|= (((value
>> shift
)
4796 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
4800 next_offset
+= this_time
;
4801 byte_buffer_in_use
= 1;
4806 if (byte_buffer_in_use
)
4808 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4812 if ((unsigned HOST_WIDE_INT
)total_bytes
< size
)
4813 assemble_zeros (size
- total_bytes
);
4816 /* This TREE_LIST contains any weak symbol declarations waiting
4818 static GTY(()) tree weak_decls
;
4820 /* Mark DECL as weak. */
4823 mark_weak (tree decl
)
4825 DECL_WEAK (decl
) = 1;
4827 if (DECL_RTL_SET_P (decl
)
4828 && MEM_P (DECL_RTL (decl
))
4829 && XEXP (DECL_RTL (decl
), 0)
4830 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
4831 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
4834 /* Merge weak status between NEWDECL and OLDDECL. */
4837 merge_weak (tree newdecl
, tree olddecl
)
4839 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
4841 if (DECL_WEAK (newdecl
) && SUPPORTS_WEAK
)
4844 /* We put the NEWDECL on the weak_decls list at some point
4845 and OLDDECL as well. Keep just OLDDECL on the list. */
4846 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
4847 if (TREE_VALUE (*pwd
) == newdecl
)
4849 *pwd
= TREE_CHAIN (*pwd
);
4856 if (DECL_WEAK (newdecl
))
4860 /* NEWDECL is weak, but OLDDECL is not. */
4862 /* If we already output the OLDDECL, we're in trouble; we can't
4863 go back and make it weak. This error cannot caught in
4864 declare_weak because the NEWDECL and OLDDECL was not yet
4865 been merged; therefore, TREE_ASM_WRITTEN was not set. */
4866 if (TREE_ASM_WRITTEN (olddecl
))
4867 error ("weak declaration of %q+D must precede definition",
4870 /* If we've already generated rtl referencing OLDDECL, we may
4871 have done so in a way that will not function properly with
4873 else if (TREE_USED (olddecl
)
4874 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)))
4875 warning (0, "weak declaration of %q+D after first use results "
4876 "in unspecified behavior", newdecl
);
4880 /* We put the NEWDECL on the weak_decls list at some point.
4881 Replace it with the OLDDECL. */
4882 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
4883 if (TREE_VALUE (wd
) == newdecl
)
4885 TREE_VALUE (wd
) = olddecl
;
4888 /* We may not find the entry on the list. If NEWDECL is a
4889 weak alias, then we will have already called
4890 globalize_decl to remove the entry; in that case, we do
4891 not need to do anything. */
4894 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
4895 mark_weak (olddecl
);
4898 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
4899 weak. Just update NEWDECL to indicate that it's weak too. */
4900 mark_weak (newdecl
);
4903 /* Declare DECL to be a weak symbol. */
4906 declare_weak (tree decl
)
4908 if (! TREE_PUBLIC (decl
))
4909 error ("weak declaration of %q+D must be public", decl
);
4910 else if (TREE_CODE (decl
) == FUNCTION_DECL
&& TREE_ASM_WRITTEN (decl
))
4911 error ("weak declaration of %q+D must precede definition", decl
);
4912 else if (SUPPORTS_WEAK
)
4914 if (! DECL_WEAK (decl
))
4915 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
4918 warning (0, "weak declaration of %q+D not supported", decl
);
4924 weak_finish_1 (tree decl
)
4926 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
4927 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
4930 if (! TREE_USED (decl
))
4933 #ifdef ASM_WEAKEN_DECL
4934 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
4936 #ifdef ASM_WEAKEN_LABEL
4937 ASM_WEAKEN_LABEL (asm_out_file
, name
);
4939 #ifdef ASM_OUTPUT_WEAK_ALIAS
4941 static bool warn_once
= 0;
4944 warning (0, "only weak aliases are supported in this configuration");
4954 /* This TREE_LIST contains weakref targets. */
4956 static GTY(()) tree weakref_targets
;
4958 /* Forward declaration. */
4959 static tree
find_decl_and_mark_needed (tree decl
, tree target
);
4961 /* Emit any pending weak declarations. */
4968 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
4970 tree alias_decl
= TREE_PURPOSE (t
);
4971 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
4973 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
4974 /* Remove alias_decl from the weak list, but leave entries for
4975 the target alone. */
4977 #ifndef ASM_OUTPUT_WEAKREF
4978 else if (! TREE_SYMBOL_REFERENCED (target
))
4980 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
4981 defined, otherwise we and weak_finish_1 would use a
4982 different macros. */
4983 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
4984 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
4986 tree decl
= find_decl_and_mark_needed (alias_decl
, target
);
4990 decl
= build_decl (TREE_CODE (alias_decl
), target
,
4991 TREE_TYPE (alias_decl
));
4993 DECL_EXTERNAL (decl
) = 1;
4994 TREE_PUBLIC (decl
) = 1;
4995 DECL_ARTIFICIAL (decl
) = 1;
4996 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
4997 TREE_USED (decl
) = 1;
5000 weak_finish_1 (decl
);
5009 /* Remove the alias and the target from the pending weak list
5010 so that we do not emit any .weak directives for the former,
5011 nor multiple .weak directives for the latter. */
5012 for (p
= &weak_decls
; (t2
= *p
) ; )
5014 if (TREE_VALUE (t2
) == alias_decl
5015 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5016 *p
= TREE_CHAIN (t2
);
5018 p
= &TREE_CHAIN (t2
);
5021 /* Remove other weakrefs to the same target, to speed things up. */
5022 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5024 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5025 *p
= TREE_CHAIN (t2
);
5027 p
= &TREE_CHAIN (t2
);
5032 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5034 tree decl
= TREE_VALUE (t
);
5036 weak_finish_1 (decl
);
5040 /* Emit the assembly bits to indicate that DECL is globally visible. */
5043 globalize_decl (tree decl
)
5046 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5047 if (DECL_WEAK (decl
))
5049 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5052 #ifdef ASM_WEAKEN_DECL
5053 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5055 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5058 /* Remove this function from the pending weak list so that
5059 we do not emit multiple .weak directives for it. */
5060 for (p
= &weak_decls
; (t
= *p
) ; )
5062 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5063 *p
= TREE_CHAIN (t
);
5065 p
= &TREE_CHAIN (t
);
5068 /* Remove weakrefs to the same target from the pending weakref
5069 list, for the same reason. */
5070 for (p
= &weakref_targets
; (t
= *p
) ; )
5072 if (DECL_ASSEMBLER_NAME (decl
)
5073 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5074 *p
= TREE_CHAIN (t
);
5076 p
= &TREE_CHAIN (t
);
5083 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5086 /* We have to be able to tell cgraph about the needed-ness of the target
5087 of an alias. This requires that the decl have been defined. Aliases
5088 that precede their definition have to be queued for later processing. */
5090 typedef struct alias_pair
GTY(())
5096 /* Define gc'd vector type. */
5097 DEF_VEC_O(alias_pair
);
5098 DEF_VEC_ALLOC_O(alias_pair
,gc
);
5100 static GTY(()) VEC(alias_pair
,gc
) *alias_pairs
;
5102 /* Given an assembly name, find the decl it is associated with. At the
5103 same time, mark it needed for cgraph. */
5106 find_decl_and_mark_needed (tree decl
, tree target
)
5108 struct cgraph_node
*fnode
= NULL
;
5109 struct varpool_node
*vnode
= NULL
;
5111 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5113 fnode
= cgraph_node_for_asm (target
);
5115 vnode
= varpool_node_for_asm (target
);
5119 vnode
= varpool_node_for_asm (target
);
5121 fnode
= cgraph_node_for_asm (target
);
5126 /* We can't mark function nodes as used after cgraph global info
5127 is finished. This wouldn't generally be necessary, but C++
5128 virtual table thunks are introduced late in the game and
5129 might seem like they need marking, although in fact they
5131 if (! cgraph_global_info_ready
)
5132 cgraph_mark_needed_node (fnode
);
5137 varpool_mark_needed_node (vnode
);
5144 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5145 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5146 tree node is DECL to have the value of the tree node TARGET. */
5149 do_assemble_alias (tree decl
, tree target
)
5151 if (TREE_ASM_WRITTEN (decl
))
5154 TREE_ASM_WRITTEN (decl
) = 1;
5155 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5157 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5159 ultimate_transparent_alias_target (&target
);
5161 if (!targetm
.have_tls
5162 && TREE_CODE (decl
) == VAR_DECL
5163 && DECL_THREAD_LOCAL_P (decl
))
5165 decl
= emutls_decl (decl
);
5166 target
= get_emutls_object_name (target
);
5169 if (!TREE_SYMBOL_REFERENCED (target
))
5170 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5172 #ifdef ASM_OUTPUT_WEAKREF
5173 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5174 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5175 IDENTIFIER_POINTER (target
));
5179 error ("%Jweakref is not supported in this configuration", decl
);
5186 if (!targetm
.have_tls
5187 && TREE_CODE (decl
) == VAR_DECL
5188 && DECL_THREAD_LOCAL_P (decl
))
5190 decl
= emutls_decl (decl
);
5191 target
= get_emutls_object_name (target
);
5194 #ifdef ASM_OUTPUT_DEF
5195 /* Make name accessible from other files, if appropriate. */
5197 if (TREE_PUBLIC (decl
))
5199 globalize_decl (decl
);
5200 maybe_assemble_visibility (decl
);
5203 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5204 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5206 ASM_OUTPUT_DEF (asm_out_file
,
5207 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5208 IDENTIFIER_POINTER (target
));
5210 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5215 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5216 # ifdef ASM_WEAKEN_DECL
5217 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5219 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5221 /* Remove this function from the pending weak list so that
5222 we do not emit multiple .weak directives for it. */
5223 for (p
= &weak_decls
; (t
= *p
) ; )
5224 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5225 *p
= TREE_CHAIN (t
);
5227 p
= &TREE_CHAIN (t
);
5229 /* Remove weakrefs to the same target from the pending weakref
5230 list, for the same reason. */
5231 for (p
= &weakref_targets
; (t
= *p
) ; )
5233 if (DECL_ASSEMBLER_NAME (decl
)
5234 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5235 *p
= TREE_CHAIN (t
);
5237 p
= &TREE_CHAIN (t
);
5243 /* First pass of completing pending aliases. Make sure that cgraph knows
5244 which symbols will be required. */
5247 finish_aliases_1 (void)
5252 for (i
= 0; VEC_iterate (alias_pair
, alias_pairs
, i
, p
); i
++)
5256 target_decl
= find_decl_and_mark_needed (p
->decl
, p
->target
);
5257 if (target_decl
== NULL
)
5259 if (! lookup_attribute ("weakref", DECL_ATTRIBUTES (p
->decl
)))
5260 error ("%q+D aliased to undefined symbol %qs",
5261 p
->decl
, IDENTIFIER_POINTER (p
->target
));
5263 else if (DECL_EXTERNAL (target_decl
)
5264 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p
->decl
)))
5265 error ("%q+D aliased to external symbol %qs",
5266 p
->decl
, IDENTIFIER_POINTER (p
->target
));
5270 /* Second pass of completing pending aliases. Emit the actual assembly.
5271 This happens at the end of compilation and thus it is assured that the
5272 target symbol has been emitted. */
5275 finish_aliases_2 (void)
5280 for (i
= 0; VEC_iterate (alias_pair
, alias_pairs
, i
, p
); i
++)
5281 do_assemble_alias (p
->decl
, p
->target
);
5283 VEC_truncate (alias_pair
, alias_pairs
, 0);
5286 /* Emit an assembler directive to make the symbol for DECL an alias to
5287 the symbol for TARGET. */
5290 assemble_alias (tree decl
, tree target
)
5293 bool is_weakref
= false;
5295 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5297 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5301 ultimate_transparent_alias_target (&target
);
5303 if (alias
== target
)
5304 error ("weakref %q+D ultimately targets itself", decl
);
5307 #ifndef ASM_OUTPUT_WEAKREF
5308 IDENTIFIER_TRANSPARENT_ALIAS (alias
) = 1;
5309 TREE_CHAIN (alias
) = target
;
5312 if (TREE_PUBLIC (decl
))
5313 error ("weakref %q+D must have static linkage", decl
);
5317 #if !defined (ASM_OUTPUT_DEF)
5318 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5319 error ("%Jalias definitions not supported in this configuration", decl
);
5322 if (!DECL_WEAK (decl
))
5324 error ("%Jonly weak aliases are supported in this configuration", decl
);
5331 /* We must force creation of DECL_RTL for debug info generation, even though
5332 we don't use it here. */
5333 make_decl_rtl (decl
);
5334 TREE_USED (decl
) = 1;
5336 /* A quirk of the initial implementation of aliases required that the user
5337 add "extern" to all of them. Which is silly, but now historical. Do
5338 note that the symbol is in fact locally defined. */
5340 DECL_EXTERNAL (decl
) = 0;
5342 /* Allow aliases to aliases. */
5343 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5344 cgraph_node (decl
)->alias
= true;
5346 varpool_node (decl
)->alias
= true;
5348 /* If the target has already been emitted, we don't have to queue the
5349 alias. This saves a tad o memory. */
5350 target_decl
= find_decl_and_mark_needed (decl
, target
);
5351 if (target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5352 do_assemble_alias (decl
, target
);
5355 alias_pair
*p
= VEC_safe_push (alias_pair
, gc
, alias_pairs
, NULL
);
5361 /* Emit an assembler directive to set symbol for DECL visibility to
5362 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5365 default_assemble_visibility (tree decl
, int vis
)
5367 static const char * const visibility_types
[] = {
5368 NULL
, "protected", "hidden", "internal"
5371 const char *name
, *type
;
5373 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5374 type
= visibility_types
[vis
];
5376 #ifdef HAVE_GAS_HIDDEN
5377 fprintf (asm_out_file
, "\t.%s\t", type
);
5378 assemble_name (asm_out_file
, name
);
5379 fprintf (asm_out_file
, "\n");
5381 warning (OPT_Wattributes
, "visibility attribute not supported "
5382 "in this configuration; ignored");
5386 /* A helper function to call assemble_visibility when needed for a decl. */
5389 maybe_assemble_visibility (tree decl
)
5391 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5393 if (vis
!= VISIBILITY_DEFAULT
)
5395 targetm
.asm_out
.visibility (decl
, vis
);
5402 /* Returns 1 if the target configuration supports defining public symbols
5403 so that one of them will be chosen at link time instead of generating a
5404 multiply-defined symbol error, whether through the use of weak symbols or
5405 a target-specific mechanism for having duplicates discarded. */
5408 supports_one_only (void)
5410 if (SUPPORTS_ONE_ONLY
)
5412 return SUPPORTS_WEAK
;
5415 /* Set up DECL as a public symbol that can be defined in multiple
5416 translation units without generating a linker error. */
5419 make_decl_one_only (tree decl
)
5421 gcc_assert (TREE_CODE (decl
) == VAR_DECL
5422 || TREE_CODE (decl
) == FUNCTION_DECL
);
5424 TREE_PUBLIC (decl
) = 1;
5426 if (SUPPORTS_ONE_ONLY
)
5428 #ifdef MAKE_DECL_ONE_ONLY
5429 MAKE_DECL_ONE_ONLY (decl
);
5431 DECL_ONE_ONLY (decl
) = 1;
5433 else if (TREE_CODE (decl
) == VAR_DECL
5434 && (DECL_INITIAL (decl
) == 0 || DECL_INITIAL (decl
) == error_mark_node
))
5435 DECL_COMMON (decl
) = 1;
5438 gcc_assert (SUPPORTS_WEAK
);
5439 DECL_WEAK (decl
) = 1;
5444 init_varasm_once (void)
5446 section_htab
= htab_create_ggc (31, section_entry_hash
,
5447 section_entry_eq
, NULL
);
5448 object_block_htab
= htab_create_ggc (31, object_block_entry_hash
,
5449 object_block_entry_eq
, NULL
);
5450 const_desc_htab
= htab_create_ggc (1009, const_desc_hash
,
5451 const_desc_eq
, NULL
);
5453 const_alias_set
= new_alias_set ();
5454 shared_constant_pool
= create_constant_pool ();
5456 #ifdef TEXT_SECTION_ASM_OP
5457 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
5458 TEXT_SECTION_ASM_OP
);
5461 #ifdef DATA_SECTION_ASM_OP
5462 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5463 DATA_SECTION_ASM_OP
);
5466 #ifdef SDATA_SECTION_ASM_OP
5467 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5468 SDATA_SECTION_ASM_OP
);
5471 #ifdef READONLY_DATA_SECTION_ASM_OP
5472 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
5473 READONLY_DATA_SECTION_ASM_OP
);
5476 #ifdef CTORS_SECTION_ASM_OP
5477 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
5478 CTORS_SECTION_ASM_OP
);
5481 #ifdef DTORS_SECTION_ASM_OP
5482 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
5483 DTORS_SECTION_ASM_OP
);
5486 #ifdef BSS_SECTION_ASM_OP
5487 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5488 output_section_asm_op
,
5489 BSS_SECTION_ASM_OP
);
5492 #ifdef SBSS_SECTION_ASM_OP
5493 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5494 output_section_asm_op
,
5495 SBSS_SECTION_ASM_OP
);
5498 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5499 | SECTION_COMMON
, emit_tls_common
);
5500 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5501 | SECTION_COMMON
, emit_local
);
5502 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5503 | SECTION_COMMON
, emit_common
);
5505 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
5506 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
5510 targetm
.asm_out
.init_sections ();
5512 if (readonly_data_section
== NULL
)
5513 readonly_data_section
= text_section
;
5517 decl_default_tls_model (tree decl
)
5519 enum tls_model kind
;
5522 is_local
= targetm
.binds_local_p (decl
);
5526 kind
= TLS_MODEL_LOCAL_EXEC
;
5528 kind
= TLS_MODEL_INITIAL_EXEC
;
5531 /* Local dynamic is inefficient when we're not combining the
5532 parts of the address. */
5533 else if (optimize
&& is_local
)
5534 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
5536 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
5537 if (kind
< flag_tls_default
)
5538 kind
= flag_tls_default
;
5543 /* Select a set of attributes for section NAME based on the properties
5544 of DECL and whether or not RELOC indicates that DECL's initializer
5545 might contain runtime relocations.
5547 We make the section read-only and executable for a function decl,
5548 read-only for a const data decl, and writable for a non-const data decl. */
5551 default_section_type_flags (tree decl
, const char *name
, int reloc
)
5555 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
5556 flags
= SECTION_CODE
;
5557 else if (decl
&& decl_readonly_section (decl
, reloc
))
5559 else if (current_function_decl
5561 && cfun
->unlikely_text_section_name
5562 && strcmp (name
, cfun
->unlikely_text_section_name
) == 0)
5563 flags
= SECTION_CODE
;
5565 && (!current_function_decl
|| !cfun
)
5566 && strcmp (name
, UNLIKELY_EXECUTED_TEXT_SECTION_NAME
) == 0)
5567 flags
= SECTION_CODE
;
5569 flags
= SECTION_WRITE
;
5571 if (decl
&& DECL_ONE_ONLY (decl
))
5572 flags
|= SECTION_LINKONCE
;
5574 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
5575 flags
|= SECTION_TLS
| SECTION_WRITE
;
5577 if (strcmp (name
, ".bss") == 0
5578 || strncmp (name
, ".bss.", 5) == 0
5579 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
5580 || strcmp (name
, ".sbss") == 0
5581 || strncmp (name
, ".sbss.", 6) == 0
5582 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
5583 flags
|= SECTION_BSS
;
5585 if (strcmp (name
, ".tdata") == 0
5586 || strncmp (name
, ".tdata.", 7) == 0
5587 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
5588 flags
|= SECTION_TLS
;
5590 if (strcmp (name
, ".tbss") == 0
5591 || strncmp (name
, ".tbss.", 6) == 0
5592 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
5593 flags
|= SECTION_TLS
| SECTION_BSS
;
5595 /* These three sections have special ELF types. They are neither
5596 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
5597 want to print a section type (@progbits or @nobits). If someone
5598 is silly enough to emit code or TLS variables to one of these
5599 sections, then don't handle them specially. */
5600 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
5601 && (strcmp (name
, ".init_array") == 0
5602 || strcmp (name
, ".fini_array") == 0
5603 || strcmp (name
, ".preinit_array") == 0))
5604 flags
|= SECTION_NOTYPE
;
5609 /* Return true if the target supports some form of global BSS,
5610 either through bss_noswitch_section, or by selecting a BSS
5611 section in TARGET_ASM_SELECT_SECTION. */
5614 have_global_bss_p (void)
5616 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
5619 /* Output assembly to switch to section NAME with attribute FLAGS.
5620 Four variants for common object file formats. */
5623 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
5624 unsigned int flags ATTRIBUTE_UNUSED
,
5625 tree decl ATTRIBUTE_UNUSED
)
5627 /* Some object formats don't support named sections at all. The
5628 front-end should already have flagged this as an error. */
5633 default_elf_asm_named_section (const char *name
, unsigned int flags
,
5634 tree decl ATTRIBUTE_UNUSED
)
5636 char flagchars
[10], *f
= flagchars
;
5638 /* If we have already declared this section, we can use an
5639 abbreviated form to switch back to it -- unless this section is
5640 part of a COMDAT groups, in which case GAS requires the full
5641 declaration every time. */
5642 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
5643 && (flags
& SECTION_DECLARED
))
5645 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
5649 if (!(flags
& SECTION_DEBUG
))
5651 if (flags
& SECTION_WRITE
)
5653 if (flags
& SECTION_CODE
)
5655 if (flags
& SECTION_SMALL
)
5657 if (flags
& SECTION_MERGE
)
5659 if (flags
& SECTION_STRINGS
)
5661 if (flags
& SECTION_TLS
)
5663 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
5667 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
5669 if (!(flags
& SECTION_NOTYPE
))
5674 if (flags
& SECTION_BSS
)
5680 #ifdef ASM_COMMENT_START
5681 /* On platforms that use "@" as the assembly comment character,
5683 if (strcmp (ASM_COMMENT_START
, "@") == 0)
5686 fprintf (asm_out_file
, format
, type
);
5688 if (flags
& SECTION_ENTSIZE
)
5689 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
5690 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
5691 fprintf (asm_out_file
, ",%s,comdat",
5692 lang_hooks
.decls
.comdat_group (decl
));
5695 putc ('\n', asm_out_file
);
5699 default_coff_asm_named_section (const char *name
, unsigned int flags
,
5700 tree decl ATTRIBUTE_UNUSED
)
5702 char flagchars
[8], *f
= flagchars
;
5704 if (flags
& SECTION_WRITE
)
5706 if (flags
& SECTION_CODE
)
5710 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
5714 default_pe_asm_named_section (const char *name
, unsigned int flags
,
5717 default_coff_asm_named_section (name
, flags
, decl
);
5719 if (flags
& SECTION_LINKONCE
)
5721 /* Functions may have been compiled at various levels of
5722 optimization so we can't use `same_size' here.
5723 Instead, have the linker pick one. */
5724 fprintf (asm_out_file
, "\t.linkonce %s\n",
5725 (flags
& SECTION_CODE
? "discard" : "same_size"));
5729 /* The lame default section selector. */
5732 default_select_section (tree decl
, int reloc
,
5733 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
5737 if (decl_readonly_section (decl
, reloc
))
5738 return readonly_data_section
;
5740 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
5742 if (! ((flag_pic
&& reloc
)
5743 || !TREE_READONLY (decl
)
5744 || TREE_SIDE_EFFECTS (decl
)
5745 || !TREE_CONSTANT (decl
)))
5746 return readonly_data_section
;
5748 else if (TREE_CODE (decl
) == STRING_CST
)
5749 return readonly_data_section
;
5750 else if (! (flag_pic
&& reloc
))
5751 return readonly_data_section
;
5753 return data_section
;
5756 enum section_category
5757 categorize_decl_for_section (tree decl
, int reloc
)
5759 enum section_category ret
;
5761 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5763 else if (TREE_CODE (decl
) == STRING_CST
)
5765 if (flag_mudflap
) /* or !flag_merge_constants */
5766 return SECCAT_RODATA
;
5768 return SECCAT_RODATA_MERGE_STR
;
5770 else if (TREE_CODE (decl
) == VAR_DECL
)
5772 if (bss_initializer_p (decl
))
5774 else if (! TREE_READONLY (decl
)
5775 || TREE_SIDE_EFFECTS (decl
)
5776 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
5778 /* Here the reloc_rw_mask is not testing whether the section should
5779 be read-only or not, but whether the dynamic link will have to
5780 do something. If so, we wish to segregate the data in order to
5781 minimize cache misses inside the dynamic linker. */
5782 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
5783 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
5787 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
5788 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
5789 else if (reloc
|| flag_merge_constants
< 2)
5790 /* C and C++ don't allow different variables to share the same
5791 location. -fmerge-all-constants allows even that (at the
5792 expense of not conforming). */
5793 ret
= SECCAT_RODATA
;
5794 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
5795 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
5797 ret
= SECCAT_RODATA_MERGE_CONST
;
5799 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
5801 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
5802 || TREE_SIDE_EFFECTS (decl
)
5803 || ! TREE_CONSTANT (decl
))
5806 ret
= SECCAT_RODATA
;
5809 ret
= SECCAT_RODATA
;
5811 /* There are no read-only thread-local sections. */
5812 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
5814 /* Note that this would be *just* SECCAT_BSS, except that there's
5815 no concept of a read-only thread-local-data section. */
5816 if (ret
== SECCAT_BSS
5817 || (flag_zero_initialized_in_bss
5818 && initializer_zerop (DECL_INITIAL (decl
))))
5824 /* If the target uses small data sections, select it. */
5825 else if (targetm
.in_small_data_p (decl
))
5827 if (ret
== SECCAT_BSS
)
5829 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
5830 ret
= SECCAT_SRODATA
;
5839 decl_readonly_section (tree decl
, int reloc
)
5841 switch (categorize_decl_for_section (decl
, reloc
))
5844 case SECCAT_RODATA_MERGE_STR
:
5845 case SECCAT_RODATA_MERGE_STR_INIT
:
5846 case SECCAT_RODATA_MERGE_CONST
:
5847 case SECCAT_SRODATA
:
5856 /* Select a section based on the above categorization. */
5859 default_elf_select_section (tree decl
, int reloc
,
5860 unsigned HOST_WIDE_INT align
)
5863 switch (categorize_decl_for_section (decl
, reloc
))
5866 /* We're not supposed to be called on FUNCTION_DECLs. */
5869 return readonly_data_section
;
5870 case SECCAT_RODATA_MERGE_STR
:
5871 return mergeable_string_section (decl
, align
, 0);
5872 case SECCAT_RODATA_MERGE_STR_INIT
:
5873 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
5874 case SECCAT_RODATA_MERGE_CONST
:
5875 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
5876 case SECCAT_SRODATA
:
5880 return data_section
;
5881 case SECCAT_DATA_REL
:
5882 sname
= ".data.rel";
5884 case SECCAT_DATA_REL_LOCAL
:
5885 sname
= ".data.rel.local";
5887 case SECCAT_DATA_REL_RO
:
5888 sname
= ".data.rel.ro";
5890 case SECCAT_DATA_REL_RO_LOCAL
:
5891 sname
= ".data.rel.ro.local";
5916 return get_named_section (decl
, sname
, reloc
);
5919 /* Construct a unique section name based on the decl name and the
5920 categorization performed above. */
5923 default_unique_section (tree decl
, int reloc
)
5925 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
5926 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
5927 const char *prefix
, *name
;
5931 switch (categorize_decl_for_section (decl
, reloc
))
5934 prefix
= one_only
? ".gnu.linkonce.t." : ".text.";
5937 case SECCAT_RODATA_MERGE_STR
:
5938 case SECCAT_RODATA_MERGE_STR_INIT
:
5939 case SECCAT_RODATA_MERGE_CONST
:
5940 prefix
= one_only
? ".gnu.linkonce.r." : ".rodata.";
5942 case SECCAT_SRODATA
:
5943 prefix
= one_only
? ".gnu.linkonce.s2." : ".sdata2.";
5946 prefix
= one_only
? ".gnu.linkonce.d." : ".data.";
5948 case SECCAT_DATA_REL
:
5949 prefix
= one_only
? ".gnu.linkonce.d.rel." : ".data.rel.";
5951 case SECCAT_DATA_REL_LOCAL
:
5952 prefix
= one_only
? ".gnu.linkonce.d.rel.local." : ".data.rel.local.";
5954 case SECCAT_DATA_REL_RO
:
5955 prefix
= one_only
? ".gnu.linkonce.d.rel.ro." : ".data.rel.ro.";
5957 case SECCAT_DATA_REL_RO_LOCAL
:
5958 prefix
= one_only
? ".gnu.linkonce.d.rel.ro.local."
5959 : ".data.rel.ro.local.";
5962 prefix
= one_only
? ".gnu.linkonce.s." : ".sdata.";
5965 prefix
= one_only
? ".gnu.linkonce.b." : ".bss.";
5968 prefix
= one_only
? ".gnu.linkonce.sb." : ".sbss.";
5971 prefix
= one_only
? ".gnu.linkonce.td." : ".tdata.";
5974 prefix
= one_only
? ".gnu.linkonce.tb." : ".tbss.";
5979 plen
= strlen (prefix
);
5981 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5982 name
= targetm
.strip_name_encoding (name
);
5983 nlen
= strlen (name
);
5985 string
= alloca (nlen
+ plen
+ 1);
5986 memcpy (string
, prefix
, plen
);
5987 memcpy (string
+ plen
, name
, nlen
+ 1);
5989 DECL_SECTION_NAME (decl
) = build_string (nlen
+ plen
, string
);
5992 /* Like compute_reloc_for_constant, except for an RTX. The return value
5993 is a mask for which bit 1 indicates a global relocation, and bit 0
5994 indicates a local relocation. */
5997 compute_reloc_for_rtx_1 (rtx
*xp
, void *data
)
6002 switch (GET_CODE (x
))
6005 *preloc
|= SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6018 compute_reloc_for_rtx (rtx x
)
6022 switch (GET_CODE (x
))
6028 for_each_rtx (&x
, compute_reloc_for_rtx_1
, &reloc
);
6037 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
6039 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6041 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6042 return data_section
;
6044 return readonly_data_section
;
6048 default_elf_select_rtx_section (enum machine_mode mode
, rtx x
,
6049 unsigned HOST_WIDE_INT align
)
6051 int reloc
= compute_reloc_for_rtx (x
);
6053 /* ??? Handle small data here somehow. */
6055 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6058 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6060 return get_named_section (NULL
, ".data.rel.ro", 3);
6063 return mergeable_constant_section (mode
, align
, 0);
6066 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6069 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6074 /* Careful not to prod global register variables. */
6077 symbol
= XEXP (rtl
, 0);
6078 if (GET_CODE (symbol
) != SYMBOL_REF
)
6081 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6082 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6083 flags
|= SYMBOL_FLAG_FUNCTION
;
6084 if (targetm
.binds_local_p (decl
))
6085 flags
|= SYMBOL_FLAG_LOCAL
;
6086 if (targetm
.have_tls
&& TREE_CODE (decl
) == VAR_DECL
6087 && DECL_THREAD_LOCAL_P (decl
))
6088 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6089 else if (targetm
.in_small_data_p (decl
))
6090 flags
|= SYMBOL_FLAG_SMALL
;
6091 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6092 being PUBLIC, the thing *must* be defined in this translation unit.
6093 Prevent this buglet from being propagated into rtl code as well. */
6094 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6095 flags
|= SYMBOL_FLAG_EXTERNAL
;
6097 SYMBOL_REF_FLAGS (symbol
) = flags
;
6100 /* By default, we do nothing for encode_section_info, so we need not
6101 do anything but discard the '*' marker. */
6104 default_strip_name_encoding (const char *str
)
6106 return str
+ (*str
== '*');
6109 #ifdef ASM_OUTPUT_DEF
6110 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6111 anchor relative to ".", the current section position. */
6114 default_asm_output_anchor (rtx symbol
)
6118 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6119 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6120 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6124 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6127 default_use_anchors_for_symbol_p (rtx symbol
)
6132 /* Don't use anchors for mergeable sections. The linker might move
6133 the objects around. */
6134 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6135 if (sect
->common
.flags
& SECTION_MERGE
)
6138 /* Don't use anchors for small data sections. The small data register
6139 acts as an anchor for such sections. */
6140 if (sect
->common
.flags
& SECTION_SMALL
)
6143 decl
= SYMBOL_REF_DECL (symbol
);
6144 if (decl
&& DECL_P (decl
))
6146 /* Don't use section anchors for decls that might be defined by
6148 if (!targetm
.binds_local_p (decl
))
6151 /* Don't use section anchors for decls that will be placed in a
6152 small data section. */
6153 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6154 one above. The problem is that we only use SECTION_SMALL for
6155 sections that should be marked as small in the section directive. */
6156 if (targetm
.in_small_data_p (decl
))
6162 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6163 wrt cross-module name binding. */
6166 default_binds_local_p (tree exp
)
6168 return default_binds_local_p_1 (exp
, flag_shlib
);
6172 default_binds_local_p_1 (tree exp
, int shlib
)
6176 /* A non-decl is an entry in the constant pool. */
6179 /* Weakrefs may not bind locally, even though the weakref itself is
6180 always static and therefore local. */
6181 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
)))
6183 /* Static variables are always local. */
6184 else if (! TREE_PUBLIC (exp
))
6186 /* A variable is local if the user has said explicitly that it will
6188 else if (DECL_VISIBILITY_SPECIFIED (exp
)
6189 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6191 /* Variables defined outside this object might not be local. */
6192 else if (DECL_EXTERNAL (exp
))
6194 /* If defined in this object and visibility is not default, must be
6196 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6198 /* Default visibility weak data can be overridden by a strong symbol
6199 in another module and so are not local. */
6200 else if (DECL_WEAK (exp
))
6202 /* If PIC, then assume that any global name can be overridden by
6203 symbols resolved from other modules. */
6206 /* Uninitialized COMMON variable may be unified with symbols
6207 resolved from other modules. */
6208 else if (DECL_COMMON (exp
)
6209 && (DECL_INITIAL (exp
) == NULL
6210 || DECL_INITIAL (exp
) == error_mark_node
))
6212 /* Otherwise we're left with initialized (or non-common) global data
6213 which is of necessity defined locally. */
6220 /* Determine whether or not a pointer mode is valid. Assume defaults
6221 of ptr_mode or Pmode - can be overridden. */
6223 default_valid_pointer_mode (enum machine_mode mode
)
6225 return (mode
== ptr_mode
|| mode
== Pmode
);
6228 /* Default function to output code that will globalize a label. A
6229 target must define GLOBAL_ASM_OP or provide its own function to
6230 globalize a label. */
6231 #ifdef GLOBAL_ASM_OP
6233 default_globalize_label (FILE * stream
, const char *name
)
6235 fputs (GLOBAL_ASM_OP
, stream
);
6236 assemble_name (stream
, name
);
6237 putc ('\n', stream
);
6239 #endif /* GLOBAL_ASM_OP */
6241 /* Default function to output code that will globalize a declaration. */
6243 default_globalize_decl_name (FILE * stream
, tree decl
)
6245 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6246 targetm
.asm_out
.globalize_label (stream
, name
);
6249 /* Default function to output a label for unwind information. The
6250 default is to do nothing. A target that needs nonlocal labels for
6251 unwind information must provide its own function to do this. */
6253 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6254 tree decl ATTRIBUTE_UNUSED
,
6255 int for_eh ATTRIBUTE_UNUSED
,
6256 int empty ATTRIBUTE_UNUSED
)
6260 /* Default function to output a label to divide up the exception table.
6261 The default is to do nothing. A target that needs/wants to divide
6262 up the table must provide it's own function to do this. */
6264 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
6268 /* This is how to output an internal numbered label where PREFIX is
6269 the class of label and LABELNO is the number within the class. */
6272 default_internal_label (FILE *stream
, const char *prefix
,
6273 unsigned long labelno
)
6275 char *const buf
= alloca (40 + strlen (prefix
));
6276 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6277 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
6280 /* This is the default behavior at the beginning of a file. It's
6281 controlled by two other target-hook toggles. */
6283 default_file_start (void)
6285 if (targetm
.file_start_app_off
&& !flag_verbose_asm
)
6286 fputs (ASM_APP_OFF
, asm_out_file
);
6288 if (targetm
.file_start_file_directive
)
6289 output_file_directive (asm_out_file
, main_input_filename
);
6292 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6293 which emits a special section directive used to indicate whether or
6294 not this object file needs an executable stack. This is primarily
6295 a GNU extension to ELF but could be used on other targets. */
6297 int trampolines_created
;
6300 file_end_indicate_exec_stack (void)
6302 unsigned int flags
= SECTION_DEBUG
;
6303 if (trampolines_created
)
6304 flags
|= SECTION_CODE
;
6306 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
6309 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6310 a get_unnamed_section callback. */
6313 output_section_asm_op (const void *directive
)
6315 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
6318 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6319 the current section is NEW_SECTION. */
6322 switch_to_section (section
*new_section
)
6324 if (in_section
== new_section
)
6327 if (new_section
->common
.flags
& SECTION_FORGET
)
6330 in_section
= new_section
;
6332 switch (SECTION_STYLE (new_section
))
6336 && !cfun
->unlikely_text_section_name
6337 && strcmp (new_section
->named
.name
,
6338 UNLIKELY_EXECUTED_TEXT_SECTION_NAME
) == 0)
6339 cfun
->unlikely_text_section_name
= UNLIKELY_EXECUTED_TEXT_SECTION_NAME
;
6341 targetm
.asm_out
.named_section (new_section
->named
.name
,
6342 new_section
->named
.common
.flags
,
6343 new_section
->named
.decl
);
6346 case SECTION_UNNAMED
:
6347 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
6350 case SECTION_NOSWITCH
:
6355 new_section
->common
.flags
|= SECTION_DECLARED
;
6358 /* If block symbol SYMBOL has not yet been assigned an offset, place
6359 it at the end of its block. */
6362 place_block_symbol (rtx symbol
)
6364 unsigned HOST_WIDE_INT size
, mask
, offset
;
6365 struct constant_descriptor_rtx
*desc
;
6366 unsigned int alignment
;
6367 struct object_block
*block
;
6370 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
6371 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
6374 /* Work out the symbol's size and alignment. */
6375 if (CONSTANT_POOL_ADDRESS_P (symbol
))
6377 desc
= SYMBOL_REF_CONSTANT (symbol
);
6378 alignment
= desc
->align
;
6379 size
= GET_MODE_SIZE (desc
->mode
);
6381 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
6383 decl
= SYMBOL_REF_DECL (symbol
);
6384 alignment
= get_constant_alignment (decl
);
6385 size
= get_constant_size (decl
);
6389 decl
= SYMBOL_REF_DECL (symbol
);
6390 alignment
= DECL_ALIGN (decl
);
6391 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
6394 /* Calculate the object's offset from the start of the block. */
6395 block
= SYMBOL_REF_BLOCK (symbol
);
6396 mask
= alignment
/ BITS_PER_UNIT
- 1;
6397 offset
= (block
->size
+ mask
) & ~mask
;
6398 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
6400 /* Record the block's new alignment and size. */
6401 block
->alignment
= MAX (block
->alignment
, alignment
);
6402 block
->size
= offset
+ size
;
6404 VEC_safe_push (rtx
, gc
, block
->objects
, symbol
);
6407 /* Return the anchor that should be used to address byte offset OFFSET
6408 from the first object in BLOCK. MODEL is the TLS model used
6412 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
6413 enum tls_model model
)
6416 unsigned int begin
, middle
, end
;
6417 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
6420 /* Work out the anchor's offset. Use an offset of 0 for the first
6421 anchor so that we don't pessimize the case where we take the address
6422 of a variable at the beginning of the block. This is particularly
6423 useful when a block has only one variable assigned to it.
6425 We try to place anchors RANGE bytes apart, so there can then be
6426 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
6427 a ptr_mode offset. With some target settings, the lowest such
6428 anchor might be out of range for the lowest ptr_mode offset;
6429 likewise the highest anchor for the highest offset. Use anchors
6430 at the extreme ends of the ptr_mode range in such cases.
6432 All arithmetic uses unsigned integers in order to avoid
6434 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
6435 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
6436 range
= max_offset
- min_offset
+ 1;
6441 bias
= 1 << (GET_MODE_BITSIZE (ptr_mode
) - 1);
6444 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
6445 delta
-= delta
% range
;
6448 offset
= (HOST_WIDE_INT
) (-delta
);
6452 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
6453 delta
-= delta
% range
;
6454 if (delta
> bias
- 1)
6456 offset
= (HOST_WIDE_INT
) delta
;
6460 /* Do a binary search to see if there's already an anchor we can use.
6461 Set BEGIN to the new anchor's index if not. */
6463 end
= VEC_length (rtx
, block
->anchors
);
6464 while (begin
!= end
)
6466 middle
= (end
+ begin
) / 2;
6467 anchor
= VEC_index (rtx
, block
->anchors
, middle
);
6468 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
6470 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
6472 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
6474 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
6480 /* Create a new anchor with a unique label. */
6481 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
6482 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
6483 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
6484 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
6486 /* Insert it at index BEGIN. */
6487 VEC_safe_insert (rtx
, gc
, block
->anchors
, begin
, anchor
);
6491 /* Output the objects in BLOCK. */
6494 output_object_block (struct object_block
*block
)
6496 struct constant_descriptor_rtx
*desc
;
6498 HOST_WIDE_INT offset
;
6502 if (block
->objects
== NULL
)
6505 /* Switch to the section and make sure that the first byte is
6506 suitably aligned. */
6507 switch_to_section (block
->sect
);
6508 assemble_align (block
->alignment
);
6510 /* Define the values of all anchors relative to the current section
6512 for (i
= 0; VEC_iterate (rtx
, block
->anchors
, i
, symbol
); i
++)
6513 targetm
.asm_out
.output_anchor (symbol
);
6515 /* Output the objects themselves. */
6517 for (i
= 0; VEC_iterate (rtx
, block
->objects
, i
, symbol
); i
++)
6519 /* Move to the object's offset, padding with zeros if necessary. */
6520 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
6521 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
6522 if (CONSTANT_POOL_ADDRESS_P (symbol
))
6524 desc
= SYMBOL_REF_CONSTANT (symbol
);
6525 output_constant_pool_1 (desc
, 1);
6526 offset
+= GET_MODE_SIZE (desc
->mode
);
6528 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
6530 decl
= SYMBOL_REF_DECL (symbol
);
6531 assemble_constant_contents (decl
, XSTR (symbol
, 0),
6532 get_constant_alignment (decl
));
6533 offset
+= get_constant_size (decl
);
6537 decl
= SYMBOL_REF_DECL (symbol
);
6538 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
6539 offset
+= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
6544 /* A htab_traverse callback used to call output_object_block for
6545 each member of object_block_htab. */
6548 output_object_block_htab (void **slot
, void *data ATTRIBUTE_UNUSED
)
6550 output_object_block ((struct object_block
*) (*slot
));
6554 /* Output the definitions of all object_blocks. */
6557 output_object_blocks (void)
6559 htab_traverse (object_block_htab
, output_object_block_htab
, NULL
);
6562 /* This function provides a possible implementation of the
6563 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
6564 by -frecord-gcc-switches it creates a new mergeable, string section in the
6565 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
6566 contains the switches in ASCII format.
6568 FIXME: This code does not correctly handle double quote characters
6569 that appear inside strings, (it strips them rather than preserving them).
6570 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
6571 characters - instead it treats them as sub-string separators. Since
6572 we want to emit NUL strings terminators into the object file we have to use
6576 elf_record_gcc_switches (print_switch_type type
, const char * name
)
6578 static char buffer
[1024];
6580 /* This variable is used as part of a simplistic heuristic to detect
6581 command line switches which take an argument:
6583 "If a command line option does not start with a dash then
6584 it is an argument for the previous command line option."
6586 This fails in the case of the command line option which is the name
6587 of the file to compile, but otherwise it is pretty reasonable. */
6588 static bool previous_name_held_back
= FALSE
;
6592 case SWITCH_TYPE_PASSED
:
6595 if (previous_name_held_back
)
6597 unsigned int len
= strlen (buffer
);
6599 snprintf (buffer
+ len
, sizeof buffer
- len
, " %s", name
);
6600 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6601 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6602 previous_name_held_back
= FALSE
;
6606 strncpy (buffer
, name
, sizeof buffer
);
6607 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6608 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6613 if (previous_name_held_back
)
6615 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6616 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6619 strncpy (buffer
, name
, sizeof buffer
);
6620 previous_name_held_back
= TRUE
;
6624 case SWITCH_TYPE_DESCRIPTIVE
:
6627 /* Distinguish between invocations where name is NULL. */
6628 static bool started
= false;
6632 if (previous_name_held_back
)
6634 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6635 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6642 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
6646 | (SECTION_ENTSIZE
& 1),
6648 switch_to_section (sec
);
6657 /* The return value is currently ignored by the caller, but must be 0.
6658 For -fverbose-asm the return value would be the number of characters
6659 emitted into the assembler file. */
6663 /* Emit text to declare externally defined symbols. It is needed to
6664 properly support non-default visibility. */
6666 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
6668 const char *name ATTRIBUTE_UNUSED
)
6670 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
6671 set in order to avoid putting out names that are never really
6673 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
6674 && targetm
.binds_local_p (decl
))
6675 maybe_assemble_visibility (decl
);
6678 #include "gt-varasm.h"