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
->from
)
398 || (DECL_INITIAL (h
->from
)
399 && DECL_INITIAL (h
->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
->from
));
411 args
= tree_cons (NULL
, x
, args
);
412 x
= fold_convert (word_type_node
, DECL_SIZE_UNIT (h
->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 align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1102 #ifdef CONSTANT_ALIGNMENT
1103 if (DECL_INITIAL (decl
) != 0 && DECL_INITIAL (decl
) != error_mark_node
)
1104 align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
), align
);
1108 /* Reset the alignment in case we have made it tighter, so we can benefit
1109 from it in get_pointer_alignment. */
1110 DECL_ALIGN (decl
) = align
;
1113 /* Return the section into which the given VAR_DECL or CONST_DECL
1114 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1115 section should be used wherever possible. */
1118 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1122 /* If the decl has been given an explicit section name, then it
1123 isn't common, and shouldn't be handled as such. */
1124 if (DECL_COMMON (decl
) && DECL_SECTION_NAME (decl
) == NULL
)
1126 if (DECL_THREAD_LOCAL_P (decl
))
1127 return tls_comm_section
;
1128 if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1129 return comm_section
;
1132 if (DECL_INITIAL (decl
) == error_mark_node
)
1133 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1134 else if (DECL_INITIAL (decl
))
1135 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1139 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1140 if (IN_NAMED_SECTION (decl
))
1141 return get_named_section (decl
, NULL
, reloc
);
1143 if (!DECL_THREAD_LOCAL_P (decl
)
1144 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1145 && bss_initializer_p (decl
))
1147 if (!TREE_PUBLIC (decl
))
1148 return lcomm_section
;
1149 if (bss_noswitch_section
)
1150 return bss_noswitch_section
;
1153 return targetm
.asm_out
.select_section (decl
, reloc
, DECL_ALIGN (decl
));
1156 /* Return the block into which object_block DECL should be placed. */
1158 static struct object_block
*
1159 get_block_for_decl (tree decl
)
1163 if (TREE_CODE (decl
) == VAR_DECL
)
1165 /* The object must be defined in this translation unit. */
1166 if (DECL_EXTERNAL (decl
))
1169 /* There's no point using object blocks for something that is
1170 isolated by definition. */
1171 if (DECL_ONE_ONLY (decl
))
1175 /* We can only calculate block offsets if the decl has a known
1177 if (DECL_SIZE_UNIT (decl
) == NULL
)
1179 if (!host_integerp (DECL_SIZE_UNIT (decl
), 1))
1182 /* Find out which section should contain DECL. We cannot put it into
1183 an object block if it requires a standalone definition. */
1184 if (TREE_CODE (decl
) == VAR_DECL
)
1185 align_variable (decl
, 0);
1186 sect
= get_variable_section (decl
, true);
1187 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1190 return get_block_for_section (sect
);
1193 /* Make sure block symbol SYMBOL is in block BLOCK. */
1196 change_symbol_block (rtx symbol
, struct object_block
*block
)
1198 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1200 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1201 SYMBOL_REF_BLOCK (symbol
) = block
;
1205 /* Return true if it is possible to put DECL in an object_block. */
1208 use_blocks_for_decl_p (tree decl
)
1210 /* Only data DECLs can be placed into object blocks. */
1211 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1214 /* Detect decls created by dw2_force_const_mem. Such decls are
1215 special because DECL_INITIAL doesn't specify the decl's true value.
1216 dw2_output_indirect_constants will instead call assemble_variable
1217 with dont_output_data set to 1 and then print the contents itself. */
1218 if (DECL_INITIAL (decl
) == decl
)
1224 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1225 have static storage duration. In other words, it should not be an
1226 automatic variable, including PARM_DECLs.
1228 There is, however, one exception: this function handles variables
1229 explicitly placed in a particular register by the user.
1231 This is never called for PARM_DECL nodes. */
1234 make_decl_rtl (tree decl
)
1236 const char *name
= 0;
1240 /* Check that we are not being given an automatic variable. */
1241 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1242 && TREE_CODE (decl
) != RESULT_DECL
);
1244 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1245 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1246 || TREE_STATIC (decl
)
1247 || TREE_PUBLIC (decl
)
1248 || DECL_EXTERNAL (decl
)
1249 || DECL_REGISTER (decl
));
1251 /* And that we were not given a type or a label. */
1252 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1253 && TREE_CODE (decl
) != LABEL_DECL
);
1255 /* For a duplicate declaration, we can be called twice on the
1256 same DECL node. Don't discard the RTL already made. */
1257 if (DECL_RTL_SET_P (decl
))
1259 /* If the old RTL had the wrong mode, fix the mode. */
1260 x
= DECL_RTL (decl
);
1261 if (GET_MODE (x
) != DECL_MODE (decl
))
1262 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1264 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1267 /* ??? Another way to do this would be to maintain a hashed
1268 table of such critters. Instead of adding stuff to a DECL
1269 to give certain attributes to it, we could use an external
1270 hash map from DECL to set of attributes. */
1272 /* Let the target reassign the RTL if it wants.
1273 This is necessary, for example, when one machine specific
1274 decl attribute overrides another. */
1275 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1277 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1278 on the new decl information. */
1280 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1281 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1282 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1284 /* Make this function static known to the mudflap runtime. */
1285 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1286 mudflap_enqueue_decl (decl
);
1291 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
1293 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1294 && DECL_REGISTER (decl
))
1296 error ("register name not specified for %q+D", decl
);
1298 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1300 const char *asmspec
= name
+1;
1301 reg_number
= decode_reg_name (asmspec
);
1302 /* First detect errors in declaring global registers. */
1303 if (reg_number
== -1)
1304 error ("register name not specified for %q+D", decl
);
1305 else if (reg_number
< 0)
1306 error ("invalid register name for %q+D", decl
);
1307 else if (TYPE_MODE (TREE_TYPE (decl
)) == BLKmode
)
1308 error ("data type of %q+D isn%'t suitable for a register",
1310 else if (! HARD_REGNO_MODE_OK (reg_number
, TYPE_MODE (TREE_TYPE (decl
))))
1311 error ("register specified for %q+D isn%'t suitable for data type",
1313 /* Now handle properly declared static register variables. */
1318 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1320 DECL_INITIAL (decl
) = 0;
1321 error ("global register variable has initial value");
1323 if (TREE_THIS_VOLATILE (decl
))
1324 warning (OPT_Wvolatile_register_var
,
1325 "optimization may eliminate reads and/or "
1326 "writes to register variables");
1328 /* If the user specified one of the eliminables registers here,
1329 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1330 confused with that register and be eliminated. This usage is
1331 somewhat suspect... */
1333 SET_DECL_RTL (decl
, gen_rtx_raw_REG (DECL_MODE (decl
), reg_number
));
1334 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1335 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1337 if (TREE_STATIC (decl
))
1339 /* Make this register global, so not usable for anything
1341 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1342 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1343 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1345 nregs
= hard_regno_nregs
[reg_number
][DECL_MODE (decl
)];
1347 globalize_reg (reg_number
+ --nregs
);
1350 /* As a register variable, it has no section. */
1354 /* Now handle ordinary static variables and functions (in memory).
1355 Also handle vars declared register invalidly. */
1356 else if (name
[0] == '*')
1358 #ifdef REGISTER_PREFIX
1359 if (strlen (REGISTER_PREFIX
) != 0)
1361 reg_number
= decode_reg_name (name
);
1362 if (reg_number
>= 0 || reg_number
== -3)
1363 error ("register name given for non-register variable %q+D", decl
);
1368 /* Specifying a section attribute on a variable forces it into a
1369 non-.bss section, and thus it cannot be common. */
1370 if (TREE_CODE (decl
) == VAR_DECL
1371 && DECL_SECTION_NAME (decl
) != NULL_TREE
1372 && DECL_INITIAL (decl
) == NULL_TREE
1373 && DECL_COMMON (decl
))
1374 DECL_COMMON (decl
) = 0;
1376 /* Variables can't be both common and weak. */
1377 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1378 DECL_COMMON (decl
) = 0;
1380 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1381 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1383 x
= gen_rtx_SYMBOL_REF (Pmode
, name
);
1384 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1385 SET_SYMBOL_REF_DECL (x
, decl
);
1387 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1388 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1389 set_mem_attributes (x
, decl
, 1);
1390 SET_DECL_RTL (decl
, x
);
1392 /* Optionally set flags or add text to the name to record information
1393 such as that it is a function name.
1394 If the name is changed, the macro ASM_OUTPUT_LABELREF
1395 will have to know how to strip this information. */
1396 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1398 /* Make this function static known to the mudflap runtime. */
1399 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1400 mudflap_enqueue_decl (decl
);
1403 /* Make the rtl for variable VAR be volatile.
1404 Use this only for static variables. */
1407 make_var_volatile (tree var
)
1409 gcc_assert (MEM_P (DECL_RTL (var
)));
1411 MEM_VOLATILE_P (DECL_RTL (var
)) = 1;
1414 /* Output a string of literal assembler code
1415 for an `asm' keyword used between functions. */
1418 assemble_asm (tree string
)
1422 if (TREE_CODE (string
) == ADDR_EXPR
)
1423 string
= TREE_OPERAND (string
, 0);
1425 fprintf (asm_out_file
, "\t%s\n", TREE_STRING_POINTER (string
));
1428 /* Record an element in the table of global destructors. SYMBOL is
1429 a SYMBOL_REF of the function to be called; PRIORITY is a number
1430 between 0 and MAX_INIT_PRIORITY. */
1433 default_stabs_asm_out_destructor (rtx symbol ATTRIBUTE_UNUSED
,
1434 int priority ATTRIBUTE_UNUSED
)
1436 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1437 /* Tell GNU LD that this is part of the static destructor set.
1438 This will work for any system that uses stabs, most usefully
1440 dbxout_begin_simple_stabs ("___DTOR_LIST__", 22 /* N_SETT */);
1441 dbxout_stab_value_label (XSTR (symbol
, 0));
1443 sorry ("global destructors not supported on this target");
1448 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1450 const char *section
= ".dtors";
1453 /* ??? This only works reliably with the GNU linker. */
1454 if (priority
!= DEFAULT_INIT_PRIORITY
)
1456 sprintf (buf
, ".dtors.%.5u",
1457 /* Invert the numbering so the linker puts us in the proper
1458 order; constructors are run from right to left, and the
1459 linker sorts in increasing order. */
1460 MAX_INIT_PRIORITY
- priority
);
1464 switch_to_section (get_section (section
, SECTION_WRITE
, NULL
));
1465 assemble_align (POINTER_SIZE
);
1466 assemble_integer (symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1469 #ifdef DTORS_SECTION_ASM_OP
1471 default_dtor_section_asm_out_destructor (rtx symbol
,
1472 int priority ATTRIBUTE_UNUSED
)
1474 switch_to_section (dtors_section
);
1475 assemble_align (POINTER_SIZE
);
1476 assemble_integer (symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1480 /* Likewise for global constructors. */
1483 default_stabs_asm_out_constructor (rtx symbol ATTRIBUTE_UNUSED
,
1484 int priority ATTRIBUTE_UNUSED
)
1486 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1487 /* Tell GNU LD that this is part of the static destructor set.
1488 This will work for any system that uses stabs, most usefully
1490 dbxout_begin_simple_stabs ("___CTOR_LIST__", 22 /* N_SETT */);
1491 dbxout_stab_value_label (XSTR (symbol
, 0));
1493 sorry ("global constructors not supported on this target");
1498 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1500 const char *section
= ".ctors";
1503 /* ??? This only works reliably with the GNU linker. */
1504 if (priority
!= DEFAULT_INIT_PRIORITY
)
1506 sprintf (buf
, ".ctors.%.5u",
1507 /* Invert the numbering so the linker puts us in the proper
1508 order; constructors are run from right to left, and the
1509 linker sorts in increasing order. */
1510 MAX_INIT_PRIORITY
- priority
);
1514 switch_to_section (get_section (section
, SECTION_WRITE
, NULL
));
1515 assemble_align (POINTER_SIZE
);
1516 assemble_integer (symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1519 #ifdef CTORS_SECTION_ASM_OP
1521 default_ctor_section_asm_out_constructor (rtx symbol
,
1522 int priority ATTRIBUTE_UNUSED
)
1524 switch_to_section (ctors_section
);
1525 assemble_align (POINTER_SIZE
);
1526 assemble_integer (symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1530 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1531 a nonzero value if the constant pool should be output before the
1532 start of the function, or a zero value if the pool should output
1533 after the end of the function. The default is to put it before the
1536 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1537 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1540 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1541 to be output to assembler.
1542 Set first_global_object_name and weak_global_object_name as appropriate. */
1545 notice_global_symbol (tree decl
)
1547 const char **type
= &first_global_object_name
;
1549 if (first_global_object_name
1550 || !TREE_PUBLIC (decl
)
1551 || DECL_EXTERNAL (decl
)
1552 || !DECL_NAME (decl
)
1553 || (TREE_CODE (decl
) != FUNCTION_DECL
1554 && (TREE_CODE (decl
) != VAR_DECL
1555 || (DECL_COMMON (decl
)
1556 && (DECL_INITIAL (decl
) == 0
1557 || DECL_INITIAL (decl
) == error_mark_node
))))
1558 || !MEM_P (DECL_RTL (decl
)))
1561 /* We win when global object is found, but it is useful to know about weak
1562 symbol as well so we can produce nicer unique names. */
1563 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1564 type
= &weak_global_object_name
;
1570 rtx decl_rtl
= DECL_RTL (decl
);
1572 p
= targetm
.strip_name_encoding (XSTR (XEXP (decl_rtl
, 0), 0));
1573 name
= ggc_strdup (p
);
1579 /* Output assembler code for the constant pool of a function and associated
1580 with defining the name of the function. DECL describes the function.
1581 NAME is the function's name. For the constant pool, we use the current
1582 constant pool data. */
1585 assemble_start_function (tree decl
, const char *fnname
)
1588 char tmp_label
[100];
1589 bool hot_label_written
= false;
1591 cfun
->unlikely_text_section_name
= NULL
;
1593 first_function_block_is_cold
= false;
1594 if (flag_reorder_blocks_and_partition
)
1596 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1597 cfun
->hot_section_label
= ggc_strdup (tmp_label
);
1598 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1599 cfun
->cold_section_label
= ggc_strdup (tmp_label
);
1600 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1601 cfun
->hot_section_end_label
= ggc_strdup (tmp_label
);
1602 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1603 cfun
->cold_section_end_label
= ggc_strdup (tmp_label
);
1608 cfun
->hot_section_label
= NULL
;
1609 cfun
->cold_section_label
= NULL
;
1610 cfun
->hot_section_end_label
= NULL
;
1611 cfun
->cold_section_end_label
= NULL
;
1614 /* The following code does not need preprocessing in the assembler. */
1618 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1619 output_constant_pool (fnname
, decl
);
1621 resolve_unique_section (decl
, 0, flag_function_sections
);
1623 /* Make sure the not and cold text (code) sections are properly
1624 aligned. This is necessary here in the case where the function
1625 has both hot and cold sections, because we don't want to re-set
1626 the alignment when the section switch happens mid-function. */
1628 if (flag_reorder_blocks_and_partition
)
1630 switch_to_section (unlikely_text_section ());
1631 assemble_align (FUNCTION_BOUNDARY
);
1632 ASM_OUTPUT_LABEL (asm_out_file
, cfun
->cold_section_label
);
1634 /* When the function starts with a cold section, we need to explicitly
1635 align the hot section and write out the hot section label.
1636 But if the current function is a thunk, we do not have a CFG. */
1637 if (!current_function_is_thunk
1638 && BB_PARTITION (ENTRY_BLOCK_PTR
->next_bb
) == BB_COLD_PARTITION
)
1640 switch_to_section (text_section
);
1641 assemble_align (FUNCTION_BOUNDARY
);
1642 ASM_OUTPUT_LABEL (asm_out_file
, cfun
->hot_section_label
);
1643 hot_label_written
= true;
1644 first_function_block_is_cold
= true;
1647 else if (DECL_SECTION_NAME (decl
))
1649 /* Calls to function_section rely on first_function_block_is_cold
1650 being accurate. The first block may be cold even if we aren't
1651 doing partitioning, if the entire function was decided by
1652 choose_function_section (predict.c) to be cold. */
1654 initialize_cold_section_name ();
1656 if (cfun
->unlikely_text_section_name
1657 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl
)),
1658 cfun
->unlikely_text_section_name
) == 0)
1659 first_function_block_is_cold
= true;
1662 in_cold_section_p
= first_function_block_is_cold
;
1664 /* Switch to the correct text section for the start of the function. */
1666 switch_to_section (function_section (decl
));
1667 if (flag_reorder_blocks_and_partition
1668 && !hot_label_written
)
1669 ASM_OUTPUT_LABEL (asm_out_file
, cfun
->hot_section_label
);
1671 /* Tell assembler to move to target machine's alignment for functions. */
1672 align
= floor_log2 (FUNCTION_BOUNDARY
/ BITS_PER_UNIT
);
1673 if (align
< force_align_functions_log
)
1674 align
= force_align_functions_log
;
1677 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1680 /* Handle a user-specified function alignment.
1681 Note that we still need to align to FUNCTION_BOUNDARY, as above,
1682 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1683 if (align_functions_log
> align
1684 && cfun
->function_frequency
!= FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
)
1686 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1687 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1688 align_functions_log
, align_functions
- 1);
1690 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1694 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1695 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1698 (*debug_hooks
->begin_function
) (decl
);
1700 /* Make function name accessible from other files, if appropriate. */
1702 if (TREE_PUBLIC (decl
))
1704 notice_global_symbol (decl
);
1706 globalize_decl (decl
);
1708 maybe_assemble_visibility (decl
);
1711 if (DECL_PRESERVE_P (decl
))
1712 targetm
.asm_out
.mark_decl_preserved (fnname
);
1714 /* Do any machine/system dependent processing of the function name. */
1715 #ifdef ASM_DECLARE_FUNCTION_NAME
1716 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1718 /* Standard thing is just output label for the function. */
1719 ASM_OUTPUT_LABEL (asm_out_file
, fnname
);
1720 #endif /* ASM_DECLARE_FUNCTION_NAME */
1723 /* Output assembler code associated with defining the size of the
1724 function. DECL describes the function. NAME is the function's name. */
1727 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1729 #ifdef ASM_DECLARE_FUNCTION_SIZE
1730 /* We could have switched section in the middle of the function. */
1731 if (flag_reorder_blocks_and_partition
)
1732 switch_to_section (function_section (decl
));
1733 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1735 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1737 output_constant_pool (fnname
, decl
);
1738 switch_to_section (function_section (decl
)); /* need to switch back */
1740 /* Output labels for end of hot/cold text sections (to be used by
1742 if (flag_reorder_blocks_and_partition
)
1744 section
*save_text_section
;
1746 save_text_section
= in_section
;
1747 switch_to_section (unlikely_text_section ());
1748 ASM_OUTPUT_LABEL (asm_out_file
, cfun
->cold_section_end_label
);
1749 if (first_function_block_is_cold
)
1750 switch_to_section (text_section
);
1752 switch_to_section (function_section (decl
));
1753 ASM_OUTPUT_LABEL (asm_out_file
, cfun
->hot_section_end_label
);
1754 switch_to_section (save_text_section
);
1758 /* Assemble code to leave SIZE bytes of zeros. */
1761 assemble_zeros (unsigned HOST_WIDE_INT size
)
1763 /* Do no output if -fsyntax-only. */
1764 if (flag_syntax_only
)
1767 #ifdef ASM_NO_SKIP_IN_TEXT
1768 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1769 so we must output 0s explicitly in the text section. */
1770 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1772 unsigned HOST_WIDE_INT i
;
1773 for (i
= 0; i
< size
; i
++)
1774 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1779 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1782 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1785 assemble_align (int align
)
1787 if (align
> BITS_PER_UNIT
)
1789 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1793 /* Assemble a string constant with the specified C string as contents. */
1796 assemble_string (const char *p
, int size
)
1801 /* If the string is very long, split it up. */
1805 int thissize
= size
- pos
;
1806 if (thissize
> maximum
)
1809 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1817 /* A noswitch_section_callback for lcomm_section. */
1820 emit_local (tree decl ATTRIBUTE_UNUSED
,
1821 const char *name ATTRIBUTE_UNUSED
,
1822 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1823 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1825 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1826 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1827 size
, DECL_ALIGN (decl
));
1829 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1830 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1833 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1838 /* A noswitch_section_callback for bss_noswitch_section. */
1840 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
1842 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1843 const char *name ATTRIBUTE_UNUSED
,
1844 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1845 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1847 #if defined ASM_OUTPUT_ALIGNED_BSS
1848 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
, DECL_ALIGN (decl
));
1851 ASM_OUTPUT_BSS (asm_out_file
, decl
, name
, size
, rounded
);
1857 /* A noswitch_section_callback for comm_section. */
1860 emit_common (tree decl ATTRIBUTE_UNUSED
,
1861 const char *name ATTRIBUTE_UNUSED
,
1862 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1863 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1865 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1866 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1867 size
, DECL_ALIGN (decl
));
1869 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1870 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1873 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1878 /* A noswitch_section_callback for tls_comm_section. */
1881 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1882 const char *name ATTRIBUTE_UNUSED
,
1883 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1884 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1886 #ifdef ASM_OUTPUT_TLS_COMMON
1887 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
1890 sorry ("thread-local COMMON data not implemented");
1895 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1896 NAME is the name of DECL's SYMBOL_REF. */
1899 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
)
1901 unsigned HOST_WIDE_INT size
, rounded
;
1903 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
1906 /* Don't allocate zero bytes of common,
1907 since that means "undefined external" in the linker. */
1911 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1912 so that each uninitialized object starts on such a boundary. */
1913 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
1914 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
1915 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
1917 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
1918 && (unsigned HOST_WIDE_INT
) DECL_ALIGN_UNIT (decl
) > rounded
)
1919 warning (0, "requested alignment for %q+D is greater than "
1920 "implemented alignment of %wu", decl
, rounded
);
1923 /* A subroutine of assemble_variable. Output the label and contents of
1924 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1925 is as for assemble_variable. */
1928 assemble_variable_contents (tree decl
, const char *name
,
1929 bool dont_output_data
)
1931 /* Do any machine/system dependent processing of the object. */
1932 #ifdef ASM_DECLARE_OBJECT_NAME
1933 last_assemble_variable_decl
= decl
;
1934 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
1936 /* Standard thing is just output label for the object. */
1937 ASM_OUTPUT_LABEL (asm_out_file
, name
);
1938 #endif /* ASM_DECLARE_OBJECT_NAME */
1940 if (!dont_output_data
)
1942 if (DECL_INITIAL (decl
)
1943 && DECL_INITIAL (decl
) != error_mark_node
1944 && !initializer_zerop (DECL_INITIAL (decl
)))
1945 /* Output the actual data. */
1946 output_constant (DECL_INITIAL (decl
),
1947 tree_low_cst (DECL_SIZE_UNIT (decl
), 1),
1950 /* Leave space for it. */
1951 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl
), 1));
1955 /* Assemble everything that is needed for a variable or function declaration.
1956 Not used for automatic variables, and not used for function definitions.
1957 Should not be called for variables of incomplete structure type.
1959 TOP_LEVEL is nonzero if this variable has file scope.
1960 AT_END is nonzero if this is the special handling, at end of compilation,
1961 to define things that have had only tentative definitions.
1962 DONT_OUTPUT_DATA if nonzero means don't actually output the
1963 initial value (that will be done by the caller). */
1966 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
1967 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
1970 rtx decl_rtl
, symbol
;
1973 if (! targetm
.have_tls
1974 && TREE_CODE (decl
) == VAR_DECL
1975 && DECL_THREAD_LOCAL_P (decl
))
1977 tree to
= emutls_decl (decl
);
1979 /* If this variable is defined locally, then we need to initialize the
1980 control structure with size and alignment information. We do this
1981 at the last moment because tentative definitions can take a locally
1982 defined but uninitialized variable and initialize it later, which
1983 would result in incorrect contents. */
1984 if (! DECL_EXTERNAL (to
)
1985 && (! DECL_COMMON (to
)
1986 || (DECL_INITIAL (decl
)
1987 && DECL_INITIAL (decl
) != error_mark_node
)))
1989 VEC(constructor_elt
,gc
) *v
= VEC_alloc (constructor_elt
, gc
, 4);
1990 constructor_elt
*elt
;
1991 tree type
= TREE_TYPE (to
);
1992 tree field
= TYPE_FIELDS (type
);
1994 elt
= VEC_quick_push (constructor_elt
, v
, NULL
);
1996 elt
->value
= fold_convert (TREE_TYPE (field
), DECL_SIZE_UNIT (decl
));
1998 elt
= VEC_quick_push (constructor_elt
, v
, NULL
);
1999 field
= TREE_CHAIN (field
);
2001 elt
->value
= build_int_cst (TREE_TYPE (field
),
2002 DECL_ALIGN_UNIT (decl
));
2004 elt
= VEC_quick_push (constructor_elt
, v
, NULL
);
2005 field
= TREE_CHAIN (field
);
2007 elt
->value
= null_pointer_node
;
2009 elt
= VEC_quick_push (constructor_elt
, v
, NULL
);
2010 field
= TREE_CHAIN (field
);
2012 elt
->value
= get_emutls_init_templ_addr (decl
);
2014 DECL_INITIAL (to
) = build_constructor (type
, v
);
2016 /* Make sure the template is marked as needed early enough.
2017 Without this, if the variable is placed in a
2018 section-anchored block, the template will only be marked
2019 when it's too late. */
2020 record_references_in_initializer (to
);
2026 if (lang_hooks
.decls
.prepare_assemble_variable
)
2027 lang_hooks
.decls
.prepare_assemble_variable (decl
);
2029 last_assemble_variable_decl
= 0;
2031 /* Normally no need to say anything here for external references,
2032 since assemble_external is called by the language-specific code
2033 when a declaration is first seen. */
2035 if (DECL_EXTERNAL (decl
))
2038 /* Output no assembler code for a function declaration.
2039 Only definitions of functions output anything. */
2041 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2044 /* Do nothing for global register variables. */
2045 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
2047 TREE_ASM_WRITTEN (decl
) = 1;
2051 /* If type was incomplete when the variable was declared,
2052 see if it is complete now. */
2054 if (DECL_SIZE (decl
) == 0)
2055 layout_decl (decl
, 0);
2057 /* Still incomplete => don't allocate it; treat the tentative defn
2058 (which is what it must have been) as an `extern' reference. */
2060 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2062 error ("storage size of %q+D isn%'t known", decl
);
2063 TREE_ASM_WRITTEN (decl
) = 1;
2067 /* The first declaration of a variable that comes through this function
2068 decides whether it is global (in C, has external linkage)
2069 or local (in C, has internal linkage). So do nothing more
2070 if this function has already run. */
2072 if (TREE_ASM_WRITTEN (decl
))
2075 /* Make sure targetm.encode_section_info is invoked before we set
2077 decl_rtl
= DECL_RTL (decl
);
2079 TREE_ASM_WRITTEN (decl
) = 1;
2081 /* Do no output if -fsyntax-only. */
2082 if (flag_syntax_only
)
2087 if (! dont_output_data
2088 && ! host_integerp (DECL_SIZE_UNIT (decl
), 1))
2090 error ("size of variable %q+D is too large", decl
);
2094 gcc_assert (MEM_P (decl_rtl
));
2095 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2096 symbol
= XEXP (decl_rtl
, 0);
2097 name
= XSTR (symbol
, 0);
2098 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2099 notice_global_symbol (decl
);
2101 /* Compute the alignment of this data. */
2103 align_variable (decl
, dont_output_data
);
2104 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2106 if (TREE_PUBLIC (decl
))
2107 maybe_assemble_visibility (decl
);
2109 if (DECL_PRESERVE_P (decl
))
2110 targetm
.asm_out
.mark_decl_preserved (name
);
2112 /* First make the assembler name(s) global if appropriate. */
2113 sect
= get_variable_section (decl
, false);
2114 if (TREE_PUBLIC (decl
)
2116 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2117 globalize_decl (decl
);
2119 /* Output any data that we will need to use the address of. */
2120 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2121 output_addressed_constants (DECL_INITIAL (decl
));
2123 /* dbxout.c needs to know this. */
2124 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2125 DECL_IN_TEXT_SECTION (decl
) = 1;
2127 /* If the decl is part of an object_block, make sure that the decl
2128 has been positioned within its block, but do not write out its
2129 definition yet. output_object_blocks will do that later. */
2130 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2132 gcc_assert (!dont_output_data
);
2133 place_block_symbol (symbol
);
2135 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2136 assemble_noswitch_variable (decl
, name
, sect
);
2139 switch_to_section (sect
);
2140 if (DECL_ALIGN (decl
) > BITS_PER_UNIT
)
2141 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (DECL_ALIGN_UNIT (decl
)));
2142 assemble_variable_contents (decl
, name
, dont_output_data
);
2146 /* Return 1 if type TYPE contains any pointers. */
2149 contains_pointers_p (tree type
)
2151 switch (TREE_CODE (type
))
2154 case REFERENCE_TYPE
:
2155 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2156 so I'll play safe and return 1. */
2162 case QUAL_UNION_TYPE
:
2165 /* For a type that has fields, see if the fields have pointers. */
2166 for (fields
= TYPE_FIELDS (type
); fields
; fields
= TREE_CHAIN (fields
))
2167 if (TREE_CODE (fields
) == FIELD_DECL
2168 && contains_pointers_p (TREE_TYPE (fields
)))
2174 /* An array type contains pointers if its element type does. */
2175 return contains_pointers_p (TREE_TYPE (type
));
2182 /* In unit-at-a-time mode, we delay assemble_external processing until
2183 the compilation unit is finalized. This is the best we can do for
2184 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2185 it all the way to final. See PR 17982 for further discussion. */
2186 static GTY(()) tree pending_assemble_externals
;
2188 #ifdef ASM_OUTPUT_EXTERNAL
2189 /* True if DECL is a function decl for which no out-of-line copy exists.
2190 It is assumed that DECL's assembler name has been set. */
2193 incorporeal_function_p (tree decl
)
2195 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2199 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2200 && DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
)
2203 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2204 if (strncmp (name
, "__builtin_", strlen ("__builtin_")) == 0)
2210 /* Actually do the tests to determine if this is necessary, and invoke
2211 ASM_OUTPUT_EXTERNAL. */
2213 assemble_external_real (tree decl
)
2215 rtx rtl
= DECL_RTL (decl
);
2217 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2218 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2219 && !incorporeal_function_p (decl
))
2221 /* Some systems do require some output. */
2222 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2223 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2229 process_pending_assemble_externals (void)
2231 #ifdef ASM_OUTPUT_EXTERNAL
2233 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2234 assemble_external_real (TREE_VALUE (list
));
2236 pending_assemble_externals
= 0;
2240 /* Output something to declare an external symbol to the assembler.
2241 (Most assemblers don't need this, so we normally output nothing.)
2242 Do nothing if DECL is not external. */
2245 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2247 /* Because most platforms do not define ASM_OUTPUT_EXTERNAL, the
2248 main body of this code is only rarely exercised. To provide some
2249 testing, on all platforms, we make sure that the ASM_OUT_FILE is
2250 open. If it's not, we should not be calling this function. */
2251 gcc_assert (asm_out_file
);
2253 #ifdef ASM_OUTPUT_EXTERNAL
2254 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2257 /* We want to output external symbols at very last to check if they
2258 are references or not. */
2259 pending_assemble_externals
= tree_cons (0, decl
,
2260 pending_assemble_externals
);
2264 /* Similar, for calling a library function FUN. */
2267 assemble_external_libcall (rtx fun
)
2269 /* Declare library function name external when first used, if nec. */
2270 if (! SYMBOL_REF_USED (fun
))
2272 SYMBOL_REF_USED (fun
) = 1;
2273 targetm
.asm_out
.external_libcall (fun
);
2277 /* Assemble a label named NAME. */
2280 assemble_label (const char *name
)
2282 ASM_OUTPUT_LABEL (asm_out_file
, name
);
2285 /* Set the symbol_referenced flag for ID. */
2287 mark_referenced (tree id
)
2289 TREE_SYMBOL_REFERENCED (id
) = 1;
2292 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2294 mark_decl_referenced (tree decl
)
2296 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2298 /* Extern inline functions don't become needed when referenced.
2299 If we know a method will be emitted in other TU and no new
2300 functions can be marked reachable, just use the external
2302 struct cgraph_node
*node
= cgraph_node (decl
);
2303 if (!DECL_EXTERNAL (decl
)
2304 && (!node
->local
.vtable_method
|| !cgraph_global_info_ready
2305 || !node
->local
.finalized
))
2306 cgraph_mark_needed_node (node
);
2308 else if (TREE_CODE (decl
) == VAR_DECL
)
2310 struct varpool_node
*node
= varpool_node (decl
);
2311 varpool_mark_needed_node (node
);
2312 /* C++ frontend use mark_decl_references to force COMDAT variables
2313 to be output that might appear dead otherwise. */
2314 node
->force_output
= true;
2316 /* else do nothing - we can get various sorts of CST nodes here,
2317 which do not need to be marked. */
2321 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2322 until we find an identifier that is not itself a transparent alias.
2323 Modify the alias passed to it by reference (and all aliases on the
2324 way to the ultimate target), such that they do not have to be
2325 followed again, and return the ultimate target of the alias
2329 ultimate_transparent_alias_target (tree
*alias
)
2331 tree target
= *alias
;
2333 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
2335 gcc_assert (TREE_CHAIN (target
));
2336 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
2337 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
2338 && ! TREE_CHAIN (target
));
2345 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2346 starts with a *, the rest of NAME is output verbatim. Otherwise
2347 NAME is transformed in a target-specific way (usually by the
2348 addition of an underscore). */
2351 assemble_name_raw (FILE *file
, const char *name
)
2354 fputs (&name
[1], file
);
2356 ASM_OUTPUT_LABELREF (file
, name
);
2359 /* Like assemble_name_raw, but should be used when NAME might refer to
2360 an entity that is also represented as a tree (like a function or
2361 variable). If NAME does refer to such an entity, that entity will
2362 be marked as referenced. */
2365 assemble_name (FILE *file
, const char *name
)
2367 const char *real_name
;
2370 real_name
= targetm
.strip_name_encoding (name
);
2372 id
= maybe_get_identifier (real_name
);
2377 mark_referenced (id
);
2378 ultimate_transparent_alias_target (&id
);
2380 name
= IDENTIFIER_POINTER (id
);
2381 gcc_assert (! TREE_CHAIN (id
));
2384 assemble_name_raw (file
, name
);
2387 /* Allocate SIZE bytes writable static space with a gensym name
2388 and return an RTX to refer to its address. */
2391 assemble_static_space (unsigned HOST_WIDE_INT size
)
2394 const char *namestring
;
2397 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2399 namestring
= ggc_strdup (name
);
2401 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2402 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2404 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2405 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2408 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2409 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2412 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2413 so that each uninitialized object starts on such a boundary. */
2414 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2415 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2416 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2417 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2418 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2419 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2426 /* Assemble the static constant template for function entry trampolines.
2427 This is done at most once per compilation.
2428 Returns an RTX for the address of the template. */
2430 static GTY(()) rtx initial_trampoline
;
2432 #ifdef TRAMPOLINE_TEMPLATE
2434 assemble_trampoline_template (void)
2441 if (initial_trampoline
)
2442 return initial_trampoline
;
2444 /* By default, put trampoline templates in read-only data section. */
2446 #ifdef TRAMPOLINE_SECTION
2447 switch_to_section (TRAMPOLINE_SECTION
);
2449 switch_to_section (readonly_data_section
);
2452 /* Write the assembler code to define one. */
2453 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2456 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2459 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2460 TRAMPOLINE_TEMPLATE (asm_out_file
);
2462 /* Record the rtl to refer to it. */
2463 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2464 name
= ggc_strdup (label
);
2465 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2466 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2468 initial_trampoline
= gen_rtx_MEM (BLKmode
, symbol
);
2469 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2471 return initial_trampoline
;
2475 /* A and B are either alignments or offsets. Return the minimum alignment
2476 that may be assumed after adding the two together. */
2478 static inline unsigned
2479 min_align (unsigned int a
, unsigned int b
)
2481 return (a
| b
) & -(a
| b
);
2484 /* Return the assembler directive for creating a given kind of integer
2485 object. SIZE is the number of bytes in the object and ALIGNED_P
2486 indicates whether it is known to be aligned. Return NULL if the
2487 assembly dialect has no such directive.
2489 The returned string should be printed at the start of a new line and
2490 be followed immediately by the object's initial value. */
2493 integer_asm_op (int size
, int aligned_p
)
2495 struct asm_int_op
*ops
;
2498 ops
= &targetm
.asm_out
.aligned_op
;
2500 ops
= &targetm
.asm_out
.unaligned_op
;
2505 return targetm
.asm_out
.byte_op
;
2519 /* Use directive OP to assemble an integer object X. Print OP at the
2520 start of the line, followed immediately by the value of X. */
2523 assemble_integer_with_op (const char *op
, rtx x
)
2525 fputs (op
, asm_out_file
);
2526 output_addr_const (asm_out_file
, x
);
2527 fputc ('\n', asm_out_file
);
2530 /* The default implementation of the asm_out.integer target hook. */
2533 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2534 unsigned int size ATTRIBUTE_UNUSED
,
2535 int aligned_p ATTRIBUTE_UNUSED
)
2537 const char *op
= integer_asm_op (size
, aligned_p
);
2538 /* Avoid GAS bugs for large values. Specifically negative values whose
2539 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2540 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE
/ BITS_PER_UNIT
)
2542 return op
&& (assemble_integer_with_op (op
, x
), true);
2545 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2546 the alignment of the integer in bits. Return 1 if we were able to output
2547 the constant, otherwise 0. We must be able to output the constant,
2548 if FORCE is nonzero. */
2551 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2555 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2557 /* See if the target hook can handle this kind of object. */
2558 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2561 /* If the object is a multi-byte one, try splitting it up. Split
2562 it into words it if is multi-word, otherwise split it into bytes. */
2565 enum machine_mode omode
, imode
;
2566 unsigned int subalign
;
2567 unsigned int subsize
, i
;
2569 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2570 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2571 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, MODE_INT
, 0);
2572 imode
= mode_for_size (size
* BITS_PER_UNIT
, MODE_INT
, 0);
2574 for (i
= 0; i
< size
; i
+= subsize
)
2576 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2577 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2583 /* If we've printed some of it, but not all of it, there's no going
2588 gcc_assert (!force
);
2594 assemble_real (REAL_VALUE_TYPE d
, enum machine_mode mode
, unsigned int align
)
2596 long data
[4] = {0, 0, 0, 0};
2598 int bitsize
, nelts
, nunits
, units_per
;
2600 /* This is hairy. We have a quantity of known size. real_to_target
2601 will put it into an array of *host* longs, 32 bits per element
2602 (even if long is more than 32 bits). We need to determine the
2603 number of array elements that are occupied (nelts) and the number
2604 of *target* min-addressable units that will be occupied in the
2605 object file (nunits). We cannot assume that 32 divides the
2606 mode's bitsize (size * BITS_PER_UNIT) evenly.
2608 size * BITS_PER_UNIT is used here to make sure that padding bits
2609 (which might appear at either end of the value; real_to_target
2610 will include the padding bits in its output array) are included. */
2612 nunits
= GET_MODE_SIZE (mode
);
2613 bitsize
= nunits
* BITS_PER_UNIT
;
2614 nelts
= CEIL (bitsize
, 32);
2615 units_per
= 32 / BITS_PER_UNIT
;
2617 real_to_target (data
, &d
, mode
);
2619 /* Put out the first word with the specified alignment. */
2620 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2621 nunits
-= units_per
;
2623 /* Subsequent words need only 32-bit alignment. */
2624 align
= min_align (align
, 32);
2626 for (i
= 1; i
< nelts
; i
++)
2628 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2629 nunits
-= units_per
;
2633 /* Given an expression EXP with a constant value,
2634 reduce it to the sum of an assembler symbol and an integer.
2635 Store them both in the structure *VALUE.
2636 EXP must be reducible. */
2638 struct addr_const
GTY(())
2641 HOST_WIDE_INT offset
;
2645 decode_addr_const (tree exp
, struct addr_const
*value
)
2647 tree target
= TREE_OPERAND (exp
, 0);
2653 if (TREE_CODE (target
) == COMPONENT_REF
2654 && host_integerp (byte_position (TREE_OPERAND (target
, 1)), 0))
2657 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2658 target
= TREE_OPERAND (target
, 0);
2660 else if (TREE_CODE (target
) == ARRAY_REF
2661 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2663 offset
+= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target
)), 1)
2664 * tree_low_cst (TREE_OPERAND (target
, 1), 0));
2665 target
= TREE_OPERAND (target
, 0);
2671 switch (TREE_CODE (target
))
2675 x
= DECL_RTL (target
);
2679 x
= gen_rtx_MEM (FUNCTION_MODE
,
2680 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2688 x
= output_constant_def (target
, 1);
2695 gcc_assert (MEM_P (x
));
2699 value
->offset
= offset
;
2702 /* Uniquize all constants that appear in memory.
2703 Each constant in memory thus far output is recorded
2704 in `const_desc_table'. */
2706 struct constant_descriptor_tree
GTY(())
2708 /* A MEM for the constant. */
2711 /* The value of the constant. */
2714 /* Hash of value. Computing the hash from value each time
2715 hashfn is called can't work properly, as that means recursive
2716 use of the hash table during hash table expansion. */
2720 static GTY((param_is (struct constant_descriptor_tree
)))
2721 htab_t const_desc_htab
;
2723 static struct constant_descriptor_tree
* build_constant_desc (tree
);
2724 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2726 /* Compute a hash code for a constant expression. */
2729 const_desc_hash (const void *ptr
)
2731 return ((struct constant_descriptor_tree
*)ptr
)->hash
;
2735 const_hash_1 (const tree exp
)
2740 enum tree_code code
= TREE_CODE (exp
);
2742 /* Either set P and LEN to the address and len of something to hash and
2743 exit the switch or return a value. */
2748 p
= (char *) &TREE_INT_CST (exp
);
2749 len
= sizeof TREE_INT_CST (exp
);
2753 return real_hash (TREE_REAL_CST_PTR (exp
));
2756 p
= TREE_STRING_POINTER (exp
);
2757 len
= TREE_STRING_LENGTH (exp
);
2761 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2762 + const_hash_1 (TREE_IMAGPART (exp
)));
2766 unsigned HOST_WIDE_INT idx
;
2769 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2771 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2773 hi
= hi
* 603 + const_hash_1 (value
);
2781 struct addr_const value
;
2783 decode_addr_const (exp
, &value
);
2784 switch (GET_CODE (value
.base
))
2787 /* Don't hash the address of the SYMBOL_REF;
2788 only use the offset and the symbol name. */
2790 p
= XSTR (value
.base
, 0);
2791 for (i
= 0; p
[i
] != 0; i
++)
2792 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2796 hi
= value
.offset
+ CODE_LABEL_NUMBER (XEXP (value
.base
, 0)) * 13;
2807 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2808 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2812 case NON_LVALUE_EXPR
:
2813 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2816 /* A language specific constant. Just hash the code. */
2820 /* Compute hashing function. */
2822 for (i
= 0; i
< len
; i
++)
2823 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2828 /* Wrapper of compare_constant, for the htab interface. */
2830 const_desc_eq (const void *p1
, const void *p2
)
2832 const struct constant_descriptor_tree
*c1
= p1
;
2833 const struct constant_descriptor_tree
*c2
= p2
;
2834 if (c1
->hash
!= c2
->hash
)
2836 return compare_constant (c1
->value
, c2
->value
);
2839 /* Compare t1 and t2, and return 1 only if they are known to result in
2840 the same bit pattern on output. */
2843 compare_constant (const tree t1
, const tree t2
)
2845 enum tree_code typecode
;
2847 if (t1
== NULL_TREE
)
2848 return t2
== NULL_TREE
;
2849 if (t2
== NULL_TREE
)
2852 if (TREE_CODE (t1
) != TREE_CODE (t2
))
2855 switch (TREE_CODE (t1
))
2858 /* Integer constants are the same only if the same width of type. */
2859 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2861 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2863 return tree_int_cst_equal (t1
, t2
);
2866 /* Real constants are the same only if the same width of type. */
2867 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2870 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
2873 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2876 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
2877 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
2878 TREE_STRING_LENGTH (t1
)));
2881 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
2882 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
2886 VEC(constructor_elt
, gc
) *v1
, *v2
;
2887 unsigned HOST_WIDE_INT idx
;
2889 typecode
= TREE_CODE (TREE_TYPE (t1
));
2890 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
2893 if (typecode
== ARRAY_TYPE
)
2895 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
2896 /* For arrays, check that the sizes all match. */
2897 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
2899 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
2904 /* For record and union constructors, require exact type
2906 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
2910 v1
= CONSTRUCTOR_ELTS (t1
);
2911 v2
= CONSTRUCTOR_ELTS (t2
);
2912 if (VEC_length (constructor_elt
, v1
)
2913 != VEC_length (constructor_elt
, v2
))
2916 for (idx
= 0; idx
< VEC_length (constructor_elt
, v1
); ++idx
)
2918 constructor_elt
*c1
= VEC_index (constructor_elt
, v1
, idx
);
2919 constructor_elt
*c2
= VEC_index (constructor_elt
, v2
, idx
);
2921 /* Check that each value is the same... */
2922 if (!compare_constant (c1
->value
, c2
->value
))
2924 /* ... and that they apply to the same fields! */
2925 if (typecode
== ARRAY_TYPE
)
2927 if (!compare_constant (c1
->index
, c2
->index
))
2932 if (c1
->index
!= c2
->index
)
2943 struct addr_const value1
, value2
;
2945 decode_addr_const (t1
, &value1
);
2946 decode_addr_const (t2
, &value2
);
2947 return (value1
.offset
== value2
.offset
2948 && strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
2954 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
2955 && compare_constant(TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
2959 case NON_LVALUE_EXPR
:
2960 case VIEW_CONVERT_EXPR
:
2961 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
2966 nt1
= lang_hooks
.expand_constant (t1
);
2967 nt2
= lang_hooks
.expand_constant (t2
);
2968 if (nt1
!= t1
|| nt2
!= t2
)
2969 return compare_constant (nt1
, nt2
);
2978 /* Make a copy of the whole tree structure for a constant. This
2979 handles the same types of nodes that compare_constant handles. */
2982 copy_constant (tree exp
)
2984 switch (TREE_CODE (exp
))
2987 /* For ADDR_EXPR, we do not want to copy the decl whose address
2988 is requested. We do want to copy constants though. */
2989 if (CONSTANT_CLASS_P (TREE_OPERAND (exp
, 0)))
2990 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
2991 copy_constant (TREE_OPERAND (exp
, 0)));
2993 return copy_node (exp
);
2998 return copy_node (exp
);
3001 return build_complex (TREE_TYPE (exp
),
3002 copy_constant (TREE_REALPART (exp
)),
3003 copy_constant (TREE_IMAGPART (exp
)));
3007 return build2 (TREE_CODE (exp
), TREE_TYPE (exp
),
3008 copy_constant (TREE_OPERAND (exp
, 0)),
3009 copy_constant (TREE_OPERAND (exp
, 1)));
3013 case NON_LVALUE_EXPR
:
3014 case VIEW_CONVERT_EXPR
:
3015 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3016 copy_constant (TREE_OPERAND (exp
, 0)));
3020 tree copy
= copy_node (exp
);
3021 VEC(constructor_elt
, gc
) *v
;
3022 unsigned HOST_WIDE_INT idx
;
3023 tree purpose
, value
;
3025 v
= VEC_alloc(constructor_elt
, gc
, VEC_length(constructor_elt
,
3026 CONSTRUCTOR_ELTS (exp
)));
3027 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp
), idx
, purpose
, value
)
3029 constructor_elt
*ce
= VEC_quick_push (constructor_elt
, v
, NULL
);
3030 ce
->index
= purpose
;
3031 ce
->value
= copy_constant (value
);
3033 CONSTRUCTOR_ELTS (copy
) = v
;
3039 tree t
= lang_hooks
.expand_constant (exp
);
3041 gcc_assert (t
!= exp
);
3042 return copy_constant (t
);
3047 /* Return the alignment of constant EXP in bits. */
3050 get_constant_alignment (tree exp
)
3054 align
= TYPE_ALIGN (TREE_TYPE (exp
));
3055 #ifdef CONSTANT_ALIGNMENT
3056 align
= CONSTANT_ALIGNMENT (exp
, align
);
3061 /* Return the section into which constant EXP should be placed. */
3064 get_constant_section (tree exp
)
3066 if (IN_NAMED_SECTION (exp
))
3067 return get_named_section (exp
, NULL
, compute_reloc_for_constant (exp
));
3069 return targetm
.asm_out
.select_section (exp
,
3070 compute_reloc_for_constant (exp
),
3071 get_constant_alignment (exp
));
3074 /* Return the size of constant EXP in bytes. */
3076 static HOST_WIDE_INT
3077 get_constant_size (tree exp
)
3081 size
= int_size_in_bytes (TREE_TYPE (exp
));
3082 if (TREE_CODE (exp
) == STRING_CST
)
3083 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3087 /* Subroutine of output_constant_def:
3088 No constant equal to EXP is known to have been output.
3089 Make a constant descriptor to enter EXP in the hash table.
3090 Assign the label number and construct RTL to refer to the
3091 constant's location in memory.
3092 Caller is responsible for updating the hash table. */
3094 static struct constant_descriptor_tree
*
3095 build_constant_desc (tree exp
)
3101 struct constant_descriptor_tree
*desc
;
3103 desc
= ggc_alloc (sizeof (*desc
));
3104 desc
->value
= copy_constant (exp
);
3106 /* Propagate marked-ness to copied constant. */
3107 if (flag_mudflap
&& mf_marked_p (exp
))
3108 mf_mark (desc
->value
);
3110 /* Create a string containing the label name, in LABEL. */
3111 labelno
= const_labelno
++;
3112 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3114 /* We have a symbol name; construct the SYMBOL_REF and the MEM. */
3115 if (use_object_blocks_p ())
3117 section
*sect
= get_constant_section (exp
);
3118 symbol
= create_block_symbol (ggc_strdup (label
),
3119 get_block_for_section (sect
), -1);
3122 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3123 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3124 SET_SYMBOL_REF_DECL (symbol
, desc
->value
);
3125 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3127 rtl
= gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3128 set_mem_attributes (rtl
, exp
, 1);
3129 set_mem_alias_set (rtl
, 0);
3130 set_mem_alias_set (rtl
, const_alias_set
);
3132 /* Set flags or add text to the name to record information, such as
3133 that it is a local symbol. If the name is changed, the macro
3134 ASM_OUTPUT_LABELREF will have to know how to strip this
3135 information. This call might invalidate our local variable
3136 SYMBOL; we can't use it afterward. */
3138 targetm
.encode_section_info (exp
, rtl
, true);
3145 /* Return an rtx representing a reference to constant data in memory
3146 for the constant expression EXP.
3148 If assembler code for such a constant has already been output,
3149 return an rtx to refer to it.
3150 Otherwise, output such a constant in memory
3151 and generate an rtx for it.
3153 If DEFER is nonzero, this constant can be deferred and output only
3154 if referenced in the function after all optimizations.
3156 `const_desc_table' records which constants already have label strings. */
3159 output_constant_def (tree exp
, int defer
)
3161 struct constant_descriptor_tree
*desc
;
3162 struct constant_descriptor_tree key
;
3165 /* Look up EXP in the table of constant descriptors. If we didn't find
3166 it, create a new one. */
3168 key
.hash
= const_hash_1 (exp
);
3169 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3174 desc
= build_constant_desc (exp
);
3175 desc
->hash
= key
.hash
;
3179 maybe_output_constant_def_contents (desc
, defer
);
3183 /* Subroutine of output_constant_def: Decide whether or not we need to
3184 output the constant DESC now, and if so, do it. */
3186 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3189 rtx symbol
= XEXP (desc
->rtl
, 0);
3190 tree exp
= desc
->value
;
3192 if (flag_syntax_only
)
3195 if (TREE_ASM_WRITTEN (exp
))
3196 /* Already output; don't do it again. */
3199 /* We can always defer constants as long as the context allows
3203 /* Increment n_deferred_constants if it exists. It needs to be at
3204 least as large as the number of constants actually referred to
3205 by the function. If it's too small we'll stop looking too early
3206 and fail to emit constants; if it's too large we'll only look
3207 through the entire function when we could have stopped earlier. */
3209 n_deferred_constants
++;
3213 output_constant_def_contents (symbol
);
3216 /* Subroutine of output_constant_def_contents. Output the definition
3217 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3218 constant's alignment in bits. */
3221 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3225 size
= get_constant_size (exp
);
3227 /* Do any machine/system dependent processing of the constant. */
3228 #ifdef ASM_DECLARE_CONSTANT_NAME
3229 ASM_DECLARE_CONSTANT_NAME (asm_out_file
, label
, exp
, size
);
3231 /* Standard thing is just output label for the constant. */
3232 ASM_OUTPUT_LABEL (asm_out_file
, label
);
3233 #endif /* ASM_DECLARE_CONSTANT_NAME */
3235 /* Output the value of EXP. */
3236 output_constant (exp
, size
, align
);
3239 /* We must output the constant data referred to by SYMBOL; do so. */
3242 output_constant_def_contents (rtx symbol
)
3244 tree exp
= SYMBOL_REF_DECL (symbol
);
3247 /* Make sure any other constants whose addresses appear in EXP
3248 are assigned label numbers. */
3249 output_addressed_constants (exp
);
3251 /* We are no longer deferring this constant. */
3252 TREE_ASM_WRITTEN (exp
) = 1;
3254 /* If the constant is part of an object block, make sure that the
3255 decl has been positioned within its block, but do not write out
3256 its definition yet. output_object_blocks will do that later. */
3257 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3258 place_block_symbol (symbol
);
3261 switch_to_section (get_constant_section (exp
));
3262 align
= get_constant_alignment (exp
);
3263 if (align
> BITS_PER_UNIT
)
3264 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3265 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3268 mudflap_enqueue_constant (exp
);
3271 /* Look up EXP in the table of constant descriptors. Return the rtl
3272 if it has been emitted, else null. */
3275 lookup_constant_def (tree exp
)
3277 struct constant_descriptor_tree
*desc
;
3278 struct constant_descriptor_tree key
;
3281 key
.hash
= const_hash_1 (exp
);
3282 desc
= htab_find_with_hash (const_desc_htab
, &key
, key
.hash
);
3284 return (desc
? desc
->rtl
: NULL_RTX
);
3287 /* Used in the hash tables to avoid outputting the same constant
3288 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3289 are output once per function, not once per file. */
3290 /* ??? Only a few targets need per-function constant pools. Most
3291 can use one per-file pool. Should add a targetm bit to tell the
3294 struct rtx_constant_pool
GTY(())
3296 /* Pointers to first and last constant in pool, as ordered by offset. */
3297 struct constant_descriptor_rtx
*first
;
3298 struct constant_descriptor_rtx
*last
;
3300 /* Hash facility for making memory-constants from constant rtl-expressions.
3301 It is used on RISC machines where immediate integer arguments and
3302 constant addresses are restricted so that such constants must be stored
3304 htab_t
GTY((param_is (struct constant_descriptor_rtx
))) const_rtx_htab
;
3306 /* Current offset in constant pool (does not include any
3307 machine-specific header). */
3308 HOST_WIDE_INT offset
;
3311 struct constant_descriptor_rtx
GTY((chain_next ("%h.next")))
3313 struct constant_descriptor_rtx
*next
;
3317 HOST_WIDE_INT offset
;
3319 enum machine_mode mode
;
3325 /* Hash and compare functions for const_rtx_htab. */
3328 const_desc_rtx_hash (const void *ptr
)
3330 const struct constant_descriptor_rtx
*desc
= ptr
;
3335 const_desc_rtx_eq (const void *a
, const void *b
)
3337 const struct constant_descriptor_rtx
*x
= a
;
3338 const struct constant_descriptor_rtx
*y
= b
;
3340 if (x
->mode
!= y
->mode
)
3342 return rtx_equal_p (x
->constant
, y
->constant
);
3345 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3348 const_rtx_hash_1 (rtx
*xp
, void *data
)
3350 unsigned HOST_WIDE_INT hwi
;
3351 enum machine_mode mode
;
3357 code
= GET_CODE (x
);
3358 mode
= GET_MODE (x
);
3359 h
= (hashval_t
) code
* 1048573 + mode
;
3367 const int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3368 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3371 h
^= (hashval_t
) hwi
;
3372 for (i
= 1; i
< n
; ++i
)
3375 h
^= (hashval_t
) hwi
;
3381 if (mode
== VOIDmode
)
3383 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3387 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3393 for (i
= XVECLEN (x
, 0); i
-- > 0; )
3394 h
= h
* 251 + const_rtx_hash_1 (&XVECEXP (x
, 0, i
), data
);
3399 h
^= htab_hash_string (XSTR (x
, 0));
3403 h
= h
* 251 + CODE_LABEL_NUMBER (XEXP (x
, 0));
3407 case UNSPEC_VOLATILE
:
3408 h
= h
* 251 + XINT (x
, 1);
3416 *hp
= *hp
* 509 + h
;
3420 /* Compute a hash value for X, which should be a constant. */
3423 const_rtx_hash (rtx x
)
3426 for_each_rtx (&x
, const_rtx_hash_1
, &h
);
3431 /* Create and return a new rtx constant pool. */
3433 static struct rtx_constant_pool
*
3434 create_constant_pool (void)
3436 struct rtx_constant_pool
*pool
;
3438 pool
= ggc_alloc (sizeof (struct rtx_constant_pool
));
3439 pool
->const_rtx_htab
= htab_create_ggc (31, const_desc_rtx_hash
,
3440 const_desc_rtx_eq
, NULL
);
3447 /* Initialize constant pool hashing for a new function. */
3450 init_varasm_status (struct function
*f
)
3452 struct varasm_status
*p
;
3454 p
= ggc_alloc (sizeof (struct varasm_status
));
3457 p
->pool
= create_constant_pool ();
3458 p
->deferred_constants
= 0;
3461 /* Given a MINUS expression, simplify it if both sides
3462 include the same symbol. */
3465 simplify_subtraction (rtx x
)
3467 rtx r
= simplify_rtx (x
);
3471 /* Given a constant rtx X, make (or find) a memory constant for its value
3472 and return a MEM rtx to refer to it in memory. */
3475 force_const_mem (enum machine_mode mode
, rtx x
)
3477 struct constant_descriptor_rtx
*desc
, tmp
;
3478 struct rtx_constant_pool
*pool
;
3485 /* If we're not allowed to drop X into the constant pool, don't. */
3486 if (targetm
.cannot_force_const_mem (x
))
3489 /* Record that this function has used a constant pool entry. */
3490 current_function_uses_const_pool
= 1;
3492 /* Decide which pool to use. */
3493 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3494 ? shared_constant_pool
3495 : cfun
->varasm
->pool
);
3497 /* Lookup the value in the hashtable. */
3500 hash
= const_rtx_hash (x
);
3501 slot
= htab_find_slot_with_hash (pool
->const_rtx_htab
, &tmp
, hash
, INSERT
);
3504 /* If the constant was already present, return its memory. */
3506 return copy_rtx (desc
->mem
);
3508 /* Otherwise, create a new descriptor. */
3509 desc
= ggc_alloc (sizeof (*desc
));
3512 /* Align the location counter as required by EXP's data type. */
3513 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3514 #ifdef CONSTANT_ALIGNMENT
3516 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3517 if (type
!= NULL_TREE
)
3518 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3522 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3523 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3526 desc
->constant
= tmp
.constant
;
3527 desc
->offset
= pool
->offset
;
3530 desc
->align
= align
;
3531 desc
->labelno
= const_labelno
;
3534 pool
->offset
+= GET_MODE_SIZE (mode
);
3536 pool
->last
->next
= desc
;
3538 pool
->first
= pool
->last
= desc
;
3541 /* Create a string containing the label name, in LABEL. */
3542 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3545 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3546 the constants pool. */
3547 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3549 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3550 symbol
= create_block_symbol (ggc_strdup (label
),
3551 get_block_for_section (sect
), -1);
3554 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3556 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3557 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3558 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3560 /* Construct the MEM. */
3561 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3562 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3563 set_mem_align (def
, align
);
3565 /* If we're dropping a label to the constant pool, make sure we
3567 if (GET_CODE (x
) == LABEL_REF
)
3568 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3570 return copy_rtx (def
);
3573 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3576 get_pool_constant (rtx addr
)
3578 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3581 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3582 and whether it has been output or not. */
3585 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3587 struct constant_descriptor_rtx
*desc
;
3589 desc
= SYMBOL_REF_CONSTANT (addr
);
3590 *pmarked
= (desc
->mark
!= 0);
3591 return desc
->constant
;
3594 /* Similar, return the mode. */
3597 get_pool_mode (rtx addr
)
3599 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3602 /* Return the size of the constant pool. */
3605 get_pool_size (void)
3607 return cfun
->varasm
->pool
->offset
;
3610 /* Worker function for output_constant_pool_1. Emit assembly for X
3611 in MODE with known alignment ALIGN. */
3614 output_constant_pool_2 (enum machine_mode mode
, rtx x
, unsigned int align
)
3616 switch (GET_MODE_CLASS (mode
))
3619 case MODE_DECIMAL_FLOAT
:
3623 gcc_assert (GET_CODE (x
) == CONST_DOUBLE
);
3624 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3625 assemble_real (r
, mode
, align
);
3630 case MODE_PARTIAL_INT
:
3631 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3634 case MODE_VECTOR_FLOAT
:
3635 case MODE_VECTOR_INT
:
3638 enum machine_mode submode
= GET_MODE_INNER (mode
);
3639 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3641 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3642 units
= CONST_VECTOR_NUNITS (x
);
3644 for (i
= 0; i
< units
; i
++)
3646 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3647 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3657 /* Worker function for output_constant_pool. Emit constant DESC,
3658 giving it ALIGN bits of alignment. */
3661 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3668 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3669 whose CODE_LABEL has been deleted. This can occur if a jump table
3670 is eliminated by optimization. If so, write a constant of zero
3671 instead. Note that this can also happen by turning the
3672 CODE_LABEL into a NOTE. */
3673 /* ??? This seems completely and utterly wrong. Certainly it's
3674 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3675 functioning even with INSN_DELETED_P and friends. */
3678 switch (GET_CODE (x
))
3681 if (GET_CODE (XEXP (x
, 0)) != PLUS
3682 || GET_CODE (XEXP (XEXP (x
, 0), 0)) != LABEL_REF
)
3684 tmp
= XEXP (XEXP (x
, 0), 0);
3689 gcc_assert (!INSN_DELETED_P (tmp
));
3690 gcc_assert (!NOTE_P (tmp
)
3691 || NOTE_LINE_NUMBER (tmp
) != NOTE_INSN_DELETED
);
3698 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3699 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3700 align
, desc
->labelno
, done
);
3703 assemble_align (align
);
3705 /* Output the label. */
3706 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3708 /* Output the data. */
3709 output_constant_pool_2 (desc
->mode
, x
, align
);
3711 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3712 sections have proper size. */
3713 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3715 && (in_section
->common
.flags
& SECTION_MERGE
))
3716 assemble_align (align
);
3718 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3724 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3725 to as used. Emit referenced deferred strings. This function can
3726 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3729 mark_constant (rtx
*current_rtx
, void *data ATTRIBUTE_UNUSED
)
3731 rtx x
= *current_rtx
;
3733 if (x
== NULL_RTX
|| GET_CODE (x
) != SYMBOL_REF
)
3736 if (CONSTANT_POOL_ADDRESS_P (x
))
3738 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3739 if (desc
->mark
== 0)
3742 for_each_rtx (&desc
->constant
, mark_constant
, NULL
);
3745 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3747 tree exp
= SYMBOL_REF_DECL (x
);
3748 if (!TREE_ASM_WRITTEN (exp
))
3750 n_deferred_constants
--;
3751 output_constant_def_contents (x
);
3758 /* Look through appropriate parts of INSN, marking all entries in the
3759 constant pool which are actually being used. Entries that are only
3760 referenced by other constants are also marked as used. Emit
3761 deferred strings that are used. */
3764 mark_constants (rtx insn
)
3769 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3770 insns, not any notes that may be attached. We don't want to mark
3771 a constant just because it happens to appear in a REG_EQUIV note. */
3772 if (GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3774 rtx seq
= PATTERN (insn
);
3775 int i
, n
= XVECLEN (seq
, 0);
3776 for (i
= 0; i
< n
; ++i
)
3778 rtx subinsn
= XVECEXP (seq
, 0, i
);
3779 if (INSN_P (subinsn
))
3780 for_each_rtx (&PATTERN (subinsn
), mark_constant
, NULL
);
3784 for_each_rtx (&PATTERN (insn
), mark_constant
, NULL
);
3787 /* Look through the instructions for this function, and mark all the
3788 entries in POOL which are actually being used. Emit deferred constants
3789 which have indeed been used. */
3792 mark_constant_pool (void)
3796 if (!current_function_uses_const_pool
&& n_deferred_constants
== 0)
3799 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3800 mark_constants (insn
);
3802 for (link
= current_function_epilogue_delay_list
;
3804 link
= XEXP (link
, 1))
3805 mark_constants (XEXP (link
, 0));
3808 /* Write all the constants in POOL. */
3811 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
3813 struct constant_descriptor_rtx
*desc
;
3815 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3818 /* If the constant is part of an object_block, make sure that
3819 the constant has been positioned within its block, but do not
3820 write out its definition yet. output_object_blocks will do
3822 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
3823 && SYMBOL_REF_BLOCK (desc
->sym
))
3824 place_block_symbol (desc
->sym
);
3827 switch_to_section (targetm
.asm_out
.select_rtx_section
3828 (desc
->mode
, desc
->constant
, desc
->align
));
3829 output_constant_pool_1 (desc
, desc
->align
);
3834 /* Mark all constants that are used in the current function, then write
3835 out the function's private constant pool. */
3838 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
3839 tree fndecl ATTRIBUTE_UNUSED
)
3841 struct rtx_constant_pool
*pool
= cfun
->varasm
->pool
;
3843 /* It is possible for gcc to call force_const_mem and then to later
3844 discard the instructions which refer to the constant. In such a
3845 case we do not need to output the constant. */
3846 mark_constant_pool ();
3848 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3849 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3852 output_constant_pool_contents (pool
);
3854 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3855 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3859 /* Write the contents of the shared constant pool. */
3862 output_shared_constant_pool (void)
3864 output_constant_pool_contents (shared_constant_pool
);
3867 /* Determine what kind of relocations EXP may need. */
3870 compute_reloc_for_constant (tree exp
)
3872 int reloc
= 0, reloc2
;
3875 /* Give the front-end a chance to convert VALUE to something that
3876 looks more like a constant to the back-end. */
3877 exp
= lang_hooks
.expand_constant (exp
);
3879 switch (TREE_CODE (exp
))
3883 /* Go inside any operations that get_inner_reference can handle and see
3884 if what's inside is a constant: no need to do anything here for
3885 addresses of variables or functions. */
3886 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3887 tem
= TREE_OPERAND (tem
, 0))
3890 if (TREE_PUBLIC (tem
))
3897 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3898 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3902 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3903 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3904 /* The difference of two local labels is computable at link time. */
3905 if (reloc
== 1 && reloc2
== 1)
3913 case NON_LVALUE_EXPR
:
3914 case VIEW_CONVERT_EXPR
:
3915 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3920 unsigned HOST_WIDE_INT idx
;
3921 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
3923 reloc
|= compute_reloc_for_constant (tem
);
3933 /* Find all the constants whose addresses are referenced inside of EXP,
3934 and make sure assembler code with a label has been output for each one.
3935 Indicate whether an ADDR_EXPR has been encountered. */
3938 output_addressed_constants (tree exp
)
3942 /* Give the front-end a chance to convert VALUE to something that
3943 looks more like a constant to the back-end. */
3944 exp
= lang_hooks
.expand_constant (exp
);
3946 switch (TREE_CODE (exp
))
3950 /* Go inside any operations that get_inner_reference can handle and see
3951 if what's inside is a constant: no need to do anything here for
3952 addresses of variables or functions. */
3953 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3954 tem
= TREE_OPERAND (tem
, 0))
3957 /* If we have an initialized CONST_DECL, retrieve the initializer. */
3958 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
3959 tem
= DECL_INITIAL (tem
);
3961 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
3962 output_constant_def (tem
, 0);
3967 output_addressed_constants (TREE_OPERAND (exp
, 1));
3972 case NON_LVALUE_EXPR
:
3973 case VIEW_CONVERT_EXPR
:
3974 output_addressed_constants (TREE_OPERAND (exp
, 0));
3979 unsigned HOST_WIDE_INT idx
;
3980 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
3982 output_addressed_constants (tem
);
3991 /* Whether a constructor CTOR is a valid static constant initializer if all
3992 its elements are. This used to be internal to initializer_constant_valid_p
3993 and has been exposed to let other functions like categorize_ctor_elements
3994 evaluate the property while walking a constructor for other purposes. */
3997 constructor_static_from_elts_p (tree ctor
)
3999 return (TREE_CONSTANT (ctor
)
4000 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4001 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
)
4002 && !VEC_empty (constructor_elt
, CONSTRUCTOR_ELTS (ctor
)));
4005 /* Return nonzero if VALUE is a valid constant-valued expression
4006 for use in initializing a static variable; one that can be an
4007 element of a "constant" initializer.
4009 Return null_pointer_node if the value is absolute;
4010 if it is relocatable, return the variable that determines the relocation.
4011 We assume that VALUE has been folded as much as possible;
4012 therefore, we do not need to check for such things as
4013 arithmetic-combinations of integers. */
4016 initializer_constant_valid_p (tree value
, tree endtype
)
4018 /* Give the front-end a chance to convert VALUE to something that
4019 looks more like a constant to the back-end. */
4020 value
= lang_hooks
.expand_constant (value
);
4022 switch (TREE_CODE (value
))
4025 if (constructor_static_from_elts_p (value
))
4027 unsigned HOST_WIDE_INT idx
;
4029 bool absolute
= true;
4031 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4034 reloc
= initializer_constant_valid_p (elt
, TREE_TYPE (elt
));
4037 if (reloc
!= null_pointer_node
)
4040 /* For a non-absolute relocation, there is no single
4041 variable that can be "the variable that determines the
4043 return absolute
? null_pointer_node
: error_mark_node
;
4046 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4053 return null_pointer_node
;
4057 value
= staticp (TREE_OPERAND (value
, 0));
4060 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out to
4061 be a constant, this is old-skool offsetof-like nonsense. */
4062 if (TREE_CODE (value
) == INDIRECT_REF
4063 && TREE_CONSTANT (TREE_OPERAND (value
, 0)))
4064 return null_pointer_node
;
4065 /* Taking the address of a nested function involves a trampoline. */
4066 if (TREE_CODE (value
) == FUNCTION_DECL
4067 && ((decl_function_context (value
)
4068 && !DECL_NO_STATIC_CHAIN (value
))
4069 || DECL_DLLIMPORT_P (value
)))
4071 /* "&{...}" requires a temporary to hold the constructed
4073 if (TREE_CODE (value
) == CONSTRUCTOR
)
4078 case VIEW_CONVERT_EXPR
:
4079 case NON_LVALUE_EXPR
:
4080 return initializer_constant_valid_p (TREE_OPERAND (value
, 0), endtype
);
4089 src
= TREE_OPERAND (value
, 0);
4090 src_type
= TREE_TYPE (src
);
4091 dest_type
= TREE_TYPE (value
);
4093 /* Allow conversions between pointer types, floating-point
4094 types, and offset types. */
4095 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4096 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4097 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4098 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4099 return initializer_constant_valid_p (src
, endtype
);
4101 /* Allow length-preserving conversions between integer types. */
4102 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4103 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4104 return initializer_constant_valid_p (src
, endtype
);
4106 /* Allow conversions between other integer types only if
4108 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4110 tree inner
= initializer_constant_valid_p (src
, endtype
);
4111 if (inner
== null_pointer_node
)
4112 return null_pointer_node
;
4116 /* Allow (int) &foo provided int is as wide as a pointer. */
4117 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4118 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4119 return initializer_constant_valid_p (src
, endtype
);
4121 /* Likewise conversions from int to pointers, but also allow
4122 conversions from 0. */
4123 if ((POINTER_TYPE_P (dest_type
)
4124 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4125 && INTEGRAL_TYPE_P (src_type
))
4127 if (TREE_CODE (src
) == INTEGER_CST
4128 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4129 return null_pointer_node
;
4130 if (integer_zerop (src
))
4131 return null_pointer_node
;
4132 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4133 return initializer_constant_valid_p (src
, endtype
);
4136 /* Allow conversions to struct or union types if the value
4138 if (TREE_CODE (dest_type
) == RECORD_TYPE
4139 || TREE_CODE (dest_type
) == UNION_TYPE
)
4140 return initializer_constant_valid_p (src
, endtype
);
4145 if (! INTEGRAL_TYPE_P (endtype
)
4146 || TYPE_PRECISION (endtype
) >= POINTER_SIZE
)
4148 tree valid0
= initializer_constant_valid_p (TREE_OPERAND (value
, 0),
4150 tree valid1
= initializer_constant_valid_p (TREE_OPERAND (value
, 1),
4152 /* If either term is absolute, use the other terms relocation. */
4153 if (valid0
== null_pointer_node
)
4155 if (valid1
== null_pointer_node
)
4161 if (! INTEGRAL_TYPE_P (endtype
)
4162 || TYPE_PRECISION (endtype
) >= POINTER_SIZE
)
4164 tree valid0
= initializer_constant_valid_p (TREE_OPERAND (value
, 0),
4166 tree valid1
= initializer_constant_valid_p (TREE_OPERAND (value
, 1),
4168 /* Win if second argument is absolute. */
4169 if (valid1
== null_pointer_node
)
4171 /* Win if both arguments have the same relocation.
4172 Then the value is absolute. */
4173 if (valid0
== valid1
&& valid0
!= 0)
4174 return null_pointer_node
;
4176 /* Since GCC guarantees that string constants are unique in the
4177 generated code, a subtraction between two copies of the same
4178 constant string is absolute. */
4179 if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4180 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4181 && operand_equal_p (valid0
, valid1
, 1))
4182 return null_pointer_node
;
4185 /* Support narrowing differences. */
4186 if (INTEGRAL_TYPE_P (endtype
))
4190 op0
= TREE_OPERAND (value
, 0);
4191 op1
= TREE_OPERAND (value
, 1);
4193 /* Like STRIP_NOPS except allow the operand mode to widen.
4194 This works around a feature of fold that simplifies
4195 (int)(p1 - p2) to ((int)p1 - (int)p2) under the theory
4196 that the narrower operation is cheaper. */
4198 while (TREE_CODE (op0
) == NOP_EXPR
4199 || TREE_CODE (op0
) == CONVERT_EXPR
4200 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4202 tree inner
= TREE_OPERAND (op0
, 0);
4203 if (inner
== error_mark_node
4204 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4205 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4206 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4211 while (TREE_CODE (op1
) == NOP_EXPR
4212 || TREE_CODE (op1
) == CONVERT_EXPR
4213 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4215 tree inner
= TREE_OPERAND (op1
, 0);
4216 if (inner
== error_mark_node
4217 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4218 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4219 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4224 op0
= initializer_constant_valid_p (op0
, endtype
);
4225 op1
= initializer_constant_valid_p (op1
, endtype
);
4227 /* Both initializers must be known. */
4231 return null_pointer_node
;
4233 /* Support differences between labels. */
4234 if (TREE_CODE (op0
) == LABEL_DECL
4235 && TREE_CODE (op1
) == LABEL_DECL
)
4236 return null_pointer_node
;
4238 if (TREE_CODE (op0
) == STRING_CST
4239 && TREE_CODE (op1
) == STRING_CST
4240 && operand_equal_p (op0
, op1
, 1))
4241 return null_pointer_node
;
4253 /* Output assembler code for constant EXP to FILE, with no label.
4254 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4255 Assumes output_addressed_constants has been done on EXP already.
4257 Generate exactly SIZE bytes of assembler data, padding at the end
4258 with zeros if necessary. SIZE must always be specified.
4260 SIZE is important for structure constructors,
4261 since trailing members may have been omitted from the constructor.
4262 It is also important for initialization of arrays from string constants
4263 since the full length of the string constant might not be wanted.
4264 It is also needed for initialization of unions, where the initializer's
4265 type is just one member, and that may not be as long as the union.
4267 There a case in which we would fail to output exactly SIZE bytes:
4268 for a structure constructor that wants to produce more than SIZE bytes.
4269 But such constructors will never be generated for any possible input.
4271 ALIGN is the alignment of the data in bits. */
4274 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4276 enum tree_code code
;
4277 unsigned HOST_WIDE_INT thissize
;
4279 /* Some front-ends use constants other than the standard language-independent
4280 varieties, but which may still be output directly. Give the front-end a
4281 chance to convert EXP to a language-independent representation. */
4282 exp
= lang_hooks
.expand_constant (exp
);
4284 if (size
== 0 || flag_syntax_only
)
4287 /* See if we're trying to initialize a pointer in a non-default mode
4288 to the address of some declaration somewhere. If the target says
4289 the mode is valid for pointers, assume the target has a way of
4291 if (TREE_CODE (exp
) == NOP_EXPR
4292 && POINTER_TYPE_P (TREE_TYPE (exp
))
4293 && targetm
.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp
))))
4295 tree saved_type
= TREE_TYPE (exp
);
4297 /* Peel off any intermediate conversions-to-pointer for valid
4299 while (TREE_CODE (exp
) == NOP_EXPR
4300 && POINTER_TYPE_P (TREE_TYPE (exp
))
4301 && targetm
.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp
))))
4302 exp
= TREE_OPERAND (exp
, 0);
4304 /* If what we're left with is the address of something, we can
4305 convert the address to the final type and output it that
4307 if (TREE_CODE (exp
) == ADDR_EXPR
)
4308 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4309 /* Likewise for constant ints. */
4310 else if (TREE_CODE (exp
) == INTEGER_CST
)
4311 exp
= build_int_cst_wide (saved_type
, TREE_INT_CST_LOW (exp
),
4312 TREE_INT_CST_HIGH (exp
));
4316 /* Eliminate any conversions since we'll be outputting the underlying
4318 while (TREE_CODE (exp
) == NOP_EXPR
|| TREE_CODE (exp
) == CONVERT_EXPR
4319 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4320 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4322 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4323 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4325 /* Make sure eliminating the conversion is really a no-op, except with
4326 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4327 union types to allow for Ada unchecked unions. */
4328 if (type_size
> op_size
4329 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4330 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4331 /* Keep the conversion. */
4334 exp
= TREE_OPERAND (exp
, 0);
4337 code
= TREE_CODE (TREE_TYPE (exp
));
4338 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4340 /* Give the front end another chance to expand constants. */
4341 exp
= lang_hooks
.expand_constant (exp
);
4343 /* Allow a constructor with no elements for any data type.
4344 This means to fill the space with zeros. */
4345 if (TREE_CODE (exp
) == CONSTRUCTOR
4346 && VEC_empty (constructor_elt
, CONSTRUCTOR_ELTS (exp
)))
4348 assemble_zeros (size
);
4352 if (TREE_CODE (exp
) == FDESC_EXPR
)
4354 #ifdef ASM_OUTPUT_FDESC
4355 HOST_WIDE_INT part
= tree_low_cst (TREE_OPERAND (exp
, 1), 0);
4356 tree decl
= TREE_OPERAND (exp
, 0);
4357 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4364 /* Now output the underlying data. If we've handling the padding, return.
4365 Otherwise, break and ensure SIZE is the size written. */
4372 case REFERENCE_TYPE
:
4374 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4375 EXPAND_INITIALIZER
),
4376 MIN (size
, thissize
), align
, 0))
4377 error ("initializer for integer value is too complicated");
4381 if (TREE_CODE (exp
) != REAL_CST
)
4382 error ("initializer for floating value is not a floating constant");
4384 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4388 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4389 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4390 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4395 switch (TREE_CODE (exp
))
4398 output_constructor (exp
, size
, align
);
4401 thissize
= MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
),
4403 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4410 unsigned int nalign
;
4411 enum machine_mode inner
;
4413 inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4414 nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4416 elt_size
= GET_MODE_SIZE (inner
);
4418 link
= TREE_VECTOR_CST_ELTS (exp
);
4419 output_constant (TREE_VALUE (link
), elt_size
, align
);
4420 thissize
= elt_size
;
4421 while ((link
= TREE_CHAIN (link
)) != NULL
)
4423 output_constant (TREE_VALUE (link
), elt_size
, nalign
);
4424 thissize
+= elt_size
;
4435 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4436 output_constructor (exp
, size
, align
);
4446 if (size
> thissize
)
4447 assemble_zeros (size
- thissize
);
4451 /* Subroutine of output_constructor, used for computing the size of
4452 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4453 type with an unspecified upper bound. */
4455 static unsigned HOST_WIDE_INT
4456 array_size_for_constructor (tree val
)
4459 unsigned HOST_WIDE_INT cnt
;
4460 tree index
, value
, tmp
;
4462 /* This code used to attempt to handle string constants that are not
4463 arrays of single-bytes, but nothing else does, so there's no point in
4465 if (TREE_CODE (val
) == STRING_CST
)
4466 return TREE_STRING_LENGTH (val
);
4468 max_index
= NULL_TREE
;
4469 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4471 if (TREE_CODE (index
) == RANGE_EXPR
)
4472 index
= TREE_OPERAND (index
, 1);
4473 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4477 if (max_index
== NULL_TREE
)
4480 /* Compute the total number of array elements. */
4481 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4482 i
= size_binop (MINUS_EXPR
, fold_convert (sizetype
, max_index
),
4483 fold_convert (sizetype
, tmp
));
4484 i
= size_binop (PLUS_EXPR
, i
, build_int_cst (sizetype
, 1));
4486 /* Multiply by the array element unit size to find number of bytes. */
4487 i
= size_binop (MULT_EXPR
, i
, TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4489 return tree_low_cst (i
, 1);
4492 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
4493 Generate at least SIZE bytes, padding if necessary. */
4496 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
4499 tree type
= TREE_TYPE (exp
);
4502 /* Number of bytes output or skipped so far.
4503 In other words, current position within the constructor. */
4504 HOST_WIDE_INT total_bytes
= 0;
4505 /* Nonzero means BYTE contains part of a byte, to be output. */
4506 int byte_buffer_in_use
= 0;
4508 unsigned HOST_WIDE_INT cnt
;
4509 constructor_elt
*ce
;
4511 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
4513 if (TREE_CODE (type
) == RECORD_TYPE
)
4514 field
= TYPE_FIELDS (type
);
4516 if (TREE_CODE (type
) == ARRAY_TYPE
4517 && TYPE_DOMAIN (type
) != 0)
4518 min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (type
));
4520 /* As LINK goes through the elements of the constant,
4521 FIELD goes through the structure fields, if the constant is a structure.
4522 if the constant is a union, then we override this,
4523 by getting the field from the TREE_LIST element.
4524 But the constant could also be an array. Then FIELD is zero.
4526 There is always a maximum of one element in the chain LINK for unions
4527 (even if the initializer in a source program incorrectly contains
4530 VEC_iterate (constructor_elt
, CONSTRUCTOR_ELTS (exp
), cnt
, ce
);
4531 cnt
++, field
= field
? TREE_CHAIN (field
) : 0)
4533 tree val
= ce
->value
;
4536 /* The element in a union constructor specifies the proper field
4538 if ((TREE_CODE (type
) == RECORD_TYPE
|| TREE_CODE (type
) == UNION_TYPE
4539 || TREE_CODE (type
) == QUAL_UNION_TYPE
)
4543 else if (TREE_CODE (type
) == ARRAY_TYPE
)
4546 #ifdef ASM_COMMENT_START
4547 if (field
&& flag_verbose_asm
)
4548 fprintf (asm_out_file
, "%s %s:\n",
4551 ? IDENTIFIER_POINTER (DECL_NAME (field
))
4555 /* Eliminate the marker that makes a cast not be an lvalue. */
4559 if (index
&& TREE_CODE (index
) == RANGE_EXPR
)
4561 unsigned HOST_WIDE_INT fieldsize
4562 = int_size_in_bytes (TREE_TYPE (type
));
4563 HOST_WIDE_INT lo_index
= tree_low_cst (TREE_OPERAND (index
, 0), 0);
4564 HOST_WIDE_INT hi_index
= tree_low_cst (TREE_OPERAND (index
, 1), 0);
4565 HOST_WIDE_INT index
;
4566 unsigned int align2
= min_align (align
, fieldsize
* BITS_PER_UNIT
);
4568 for (index
= lo_index
; index
<= hi_index
; index
++)
4570 /* Output the element's initial value. */
4572 assemble_zeros (fieldsize
);
4574 output_constant (val
, fieldsize
, align2
);
4576 /* Count its size. */
4577 total_bytes
+= fieldsize
;
4580 else if (field
== 0 || !DECL_BIT_FIELD (field
))
4582 /* An element that is not a bit-field. */
4584 unsigned HOST_WIDE_INT fieldsize
;
4585 /* Since this structure is static,
4586 we know the positions are constant. */
4587 HOST_WIDE_INT pos
= field
? int_byte_position (field
) : 0;
4588 unsigned int align2
;
4591 pos
= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (val
)), 1)
4592 * (tree_low_cst (index
, 0) - tree_low_cst (min_index
, 0)));
4594 /* Output any buffered-up bit-fields preceding this element. */
4595 if (byte_buffer_in_use
)
4597 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4599 byte_buffer_in_use
= 0;
4602 /* Advance to offset of this element.
4603 Note no alignment needed in an array, since that is guaranteed
4604 if each element has the proper size. */
4605 if ((field
!= 0 || index
!= 0) && pos
!= total_bytes
)
4607 gcc_assert (pos
>= total_bytes
);
4608 assemble_zeros (pos
- total_bytes
);
4612 /* Find the alignment of this element. */
4613 align2
= min_align (align
, BITS_PER_UNIT
* pos
);
4615 /* Determine size this element should occupy. */
4620 /* If this is an array with an unspecified upper bound,
4621 the initializer determines the size. */
4622 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4623 but we cannot do this until the deprecated support for
4624 initializing zero-length array members is removed. */
4625 if (TREE_CODE (TREE_TYPE (field
)) == ARRAY_TYPE
4626 && TYPE_DOMAIN (TREE_TYPE (field
))
4627 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (field
))))
4629 fieldsize
= array_size_for_constructor (val
);
4630 /* Given a non-empty initialization, this field had
4632 gcc_assert (!fieldsize
|| !TREE_CHAIN (field
));
4634 else if (DECL_SIZE_UNIT (field
))
4636 /* ??? This can't be right. If the decl size overflows
4637 a host integer we will silently emit no data. */
4638 if (host_integerp (DECL_SIZE_UNIT (field
), 1))
4639 fieldsize
= tree_low_cst (DECL_SIZE_UNIT (field
), 1);
4643 fieldsize
= int_size_in_bytes (TREE_TYPE (type
));
4645 /* Output the element's initial value. */
4647 assemble_zeros (fieldsize
);
4649 output_constant (val
, fieldsize
, align2
);
4651 /* Count its size. */
4652 total_bytes
+= fieldsize
;
4654 else if (val
!= 0 && TREE_CODE (val
) != INTEGER_CST
)
4655 error ("invalid initial value for member %qs",
4656 IDENTIFIER_POINTER (DECL_NAME (field
)));
4659 /* Element that is a bit-field. */
4661 HOST_WIDE_INT next_offset
= int_bit_position (field
);
4662 HOST_WIDE_INT end_offset
4663 = (next_offset
+ tree_low_cst (DECL_SIZE (field
), 1));
4666 val
= integer_zero_node
;
4668 /* If this field does not start in this (or, next) byte,
4670 if (next_offset
/ BITS_PER_UNIT
!= total_bytes
)
4672 /* Output remnant of any bit field in previous bytes. */
4673 if (byte_buffer_in_use
)
4675 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4677 byte_buffer_in_use
= 0;
4680 /* If still not at proper byte, advance to there. */
4681 if (next_offset
/ BITS_PER_UNIT
!= total_bytes
)
4683 gcc_assert (next_offset
/ BITS_PER_UNIT
>= total_bytes
);
4684 assemble_zeros (next_offset
/ BITS_PER_UNIT
- total_bytes
);
4685 total_bytes
= next_offset
/ BITS_PER_UNIT
;
4689 if (! byte_buffer_in_use
)
4692 /* We must split the element into pieces that fall within
4693 separate bytes, and combine each byte with previous or
4694 following bit-fields. */
4696 /* next_offset is the offset n fbits from the beginning of
4697 the structure to the next bit of this element to be processed.
4698 end_offset is the offset of the first bit past the end of
4700 while (next_offset
< end_offset
)
4704 HOST_WIDE_INT value
;
4705 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
4706 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
4708 /* Advance from byte to byte
4709 within this element when necessary. */
4710 while (next_byte
!= total_bytes
)
4712 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4717 /* Number of bits we can process at once
4718 (all part of the same byte). */
4719 this_time
= MIN (end_offset
- next_offset
,
4720 BITS_PER_UNIT
- next_bit
);
4721 if (BYTES_BIG_ENDIAN
)
4723 /* On big-endian machine, take the most significant bits
4724 first (of the bits that are significant)
4725 and put them into bytes from the most significant end. */
4726 shift
= end_offset
- next_offset
- this_time
;
4728 /* Don't try to take a bunch of bits that cross
4729 the word boundary in the INTEGER_CST. We can
4730 only select bits from the LOW or HIGH part
4732 if (shift
< HOST_BITS_PER_WIDE_INT
4733 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4735 this_time
= shift
+ this_time
- HOST_BITS_PER_WIDE_INT
;
4736 shift
= HOST_BITS_PER_WIDE_INT
;
4739 /* Now get the bits from the appropriate constant word. */
4740 if (shift
< HOST_BITS_PER_WIDE_INT
)
4741 value
= TREE_INT_CST_LOW (val
);
4744 gcc_assert (shift
< 2 * HOST_BITS_PER_WIDE_INT
);
4745 value
= TREE_INT_CST_HIGH (val
);
4746 shift
-= HOST_BITS_PER_WIDE_INT
;
4749 /* Get the result. This works only when:
4750 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4751 byte
|= (((value
>> shift
)
4752 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
4753 << (BITS_PER_UNIT
- this_time
- next_bit
));
4757 /* On little-endian machines,
4758 take first the least significant bits of the value
4759 and pack them starting at the least significant
4760 bits of the bytes. */
4761 shift
= next_offset
- int_bit_position (field
);
4763 /* Don't try to take a bunch of bits that cross
4764 the word boundary in the INTEGER_CST. We can
4765 only select bits from the LOW or HIGH part
4767 if (shift
< HOST_BITS_PER_WIDE_INT
4768 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4769 this_time
= (HOST_BITS_PER_WIDE_INT
- shift
);
4771 /* Now get the bits from the appropriate constant word. */
4772 if (shift
< HOST_BITS_PER_WIDE_INT
)
4773 value
= TREE_INT_CST_LOW (val
);
4776 gcc_assert (shift
< 2 * HOST_BITS_PER_WIDE_INT
);
4777 value
= TREE_INT_CST_HIGH (val
);
4778 shift
-= HOST_BITS_PER_WIDE_INT
;
4781 /* Get the result. This works only when:
4782 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4783 byte
|= (((value
>> shift
)
4784 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
4788 next_offset
+= this_time
;
4789 byte_buffer_in_use
= 1;
4794 if (byte_buffer_in_use
)
4796 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4800 if ((unsigned HOST_WIDE_INT
)total_bytes
< size
)
4801 assemble_zeros (size
- total_bytes
);
4804 /* This TREE_LIST contains any weak symbol declarations waiting
4806 static GTY(()) tree weak_decls
;
4808 /* Mark DECL as weak. */
4811 mark_weak (tree decl
)
4813 DECL_WEAK (decl
) = 1;
4815 if (DECL_RTL_SET_P (decl
)
4816 && MEM_P (DECL_RTL (decl
))
4817 && XEXP (DECL_RTL (decl
), 0)
4818 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
4819 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
4822 /* Merge weak status between NEWDECL and OLDDECL. */
4825 merge_weak (tree newdecl
, tree olddecl
)
4827 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
4829 if (DECL_WEAK (newdecl
) && SUPPORTS_WEAK
)
4832 /* We put the NEWDECL on the weak_decls list at some point
4833 and OLDDECL as well. Keep just OLDDECL on the list. */
4834 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
4835 if (TREE_VALUE (*pwd
) == newdecl
)
4837 *pwd
= TREE_CHAIN (*pwd
);
4844 if (DECL_WEAK (newdecl
))
4848 /* NEWDECL is weak, but OLDDECL is not. */
4850 /* If we already output the OLDDECL, we're in trouble; we can't
4851 go back and make it weak. This error cannot caught in
4852 declare_weak because the NEWDECL and OLDDECL was not yet
4853 been merged; therefore, TREE_ASM_WRITTEN was not set. */
4854 if (TREE_ASM_WRITTEN (olddecl
))
4855 error ("weak declaration of %q+D must precede definition",
4858 /* If we've already generated rtl referencing OLDDECL, we may
4859 have done so in a way that will not function properly with
4861 else if (TREE_USED (olddecl
)
4862 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)))
4863 warning (0, "weak declaration of %q+D after first use results "
4864 "in unspecified behavior", newdecl
);
4868 /* We put the NEWDECL on the weak_decls list at some point.
4869 Replace it with the OLDDECL. */
4870 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
4871 if (TREE_VALUE (wd
) == newdecl
)
4873 TREE_VALUE (wd
) = olddecl
;
4876 /* We may not find the entry on the list. If NEWDECL is a
4877 weak alias, then we will have already called
4878 globalize_decl to remove the entry; in that case, we do
4879 not need to do anything. */
4882 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
4883 mark_weak (olddecl
);
4886 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
4887 weak. Just update NEWDECL to indicate that it's weak too. */
4888 mark_weak (newdecl
);
4891 /* Declare DECL to be a weak symbol. */
4894 declare_weak (tree decl
)
4896 if (! TREE_PUBLIC (decl
))
4897 error ("weak declaration of %q+D must be public", decl
);
4898 else if (TREE_CODE (decl
) == FUNCTION_DECL
&& TREE_ASM_WRITTEN (decl
))
4899 error ("weak declaration of %q+D must precede definition", decl
);
4900 else if (SUPPORTS_WEAK
)
4902 if (! DECL_WEAK (decl
))
4903 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
4906 warning (0, "weak declaration of %q+D not supported", decl
);
4912 weak_finish_1 (tree decl
)
4914 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
4915 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
4918 if (! TREE_USED (decl
))
4921 #ifdef ASM_WEAKEN_DECL
4922 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
4924 #ifdef ASM_WEAKEN_LABEL
4925 ASM_WEAKEN_LABEL (asm_out_file
, name
);
4927 #ifdef ASM_OUTPUT_WEAK_ALIAS
4929 static bool warn_once
= 0;
4932 warning (0, "only weak aliases are supported in this configuration");
4942 /* This TREE_LIST contains weakref targets. */
4944 static GTY(()) tree weakref_targets
;
4946 /* Forward declaration. */
4947 static tree
find_decl_and_mark_needed (tree decl
, tree target
);
4949 /* Emit any pending weak declarations. */
4956 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
4958 tree alias_decl
= TREE_PURPOSE (t
);
4959 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
4961 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
4962 /* Remove alias_decl from the weak list, but leave entries for
4963 the target alone. */
4965 #ifndef ASM_OUTPUT_WEAKREF
4966 else if (! TREE_SYMBOL_REFERENCED (target
))
4968 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
4969 defined, otherwise we and weak_finish_1 would use a
4970 different macros. */
4971 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
4972 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
4974 tree decl
= find_decl_and_mark_needed (alias_decl
, target
);
4978 decl
= build_decl (TREE_CODE (alias_decl
), target
,
4979 TREE_TYPE (alias_decl
));
4981 DECL_EXTERNAL (decl
) = 1;
4982 TREE_PUBLIC (decl
) = 1;
4983 DECL_ARTIFICIAL (decl
) = 1;
4984 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
4985 TREE_USED (decl
) = 1;
4988 weak_finish_1 (decl
);
4997 /* Remove the alias and the target from the pending weak list
4998 so that we do not emit any .weak directives for the former,
4999 nor multiple .weak directives for the latter. */
5000 for (p
= &weak_decls
; (t2
= *p
) ; )
5002 if (TREE_VALUE (t2
) == alias_decl
5003 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5004 *p
= TREE_CHAIN (t2
);
5006 p
= &TREE_CHAIN (t2
);
5009 /* Remove other weakrefs to the same target, to speed things up. */
5010 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5012 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5013 *p
= TREE_CHAIN (t2
);
5015 p
= &TREE_CHAIN (t2
);
5020 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5022 tree decl
= TREE_VALUE (t
);
5024 weak_finish_1 (decl
);
5028 /* Emit the assembly bits to indicate that DECL is globally visible. */
5031 globalize_decl (tree decl
)
5034 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5035 if (DECL_WEAK (decl
))
5037 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5040 #ifdef ASM_WEAKEN_DECL
5041 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5043 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5046 /* Remove this function from the pending weak list so that
5047 we do not emit multiple .weak directives for it. */
5048 for (p
= &weak_decls
; (t
= *p
) ; )
5050 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5051 *p
= TREE_CHAIN (t
);
5053 p
= &TREE_CHAIN (t
);
5056 /* Remove weakrefs to the same target from the pending weakref
5057 list, for the same reason. */
5058 for (p
= &weakref_targets
; (t
= *p
) ; )
5060 if (DECL_ASSEMBLER_NAME (decl
)
5061 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5062 *p
= TREE_CHAIN (t
);
5064 p
= &TREE_CHAIN (t
);
5071 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5074 /* We have to be able to tell cgraph about the needed-ness of the target
5075 of an alias. This requires that the decl have been defined. Aliases
5076 that precede their definition have to be queued for later processing. */
5078 typedef struct alias_pair
GTY(())
5084 /* Define gc'd vector type. */
5085 DEF_VEC_O(alias_pair
);
5086 DEF_VEC_ALLOC_O(alias_pair
,gc
);
5088 static GTY(()) VEC(alias_pair
,gc
) *alias_pairs
;
5090 /* Given an assembly name, find the decl it is associated with. At the
5091 same time, mark it needed for cgraph. */
5094 find_decl_and_mark_needed (tree decl
, tree target
)
5096 struct cgraph_node
*fnode
= NULL
;
5097 struct varpool_node
*vnode
= NULL
;
5099 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5101 fnode
= cgraph_node_for_asm (target
);
5103 vnode
= varpool_node_for_asm (target
);
5107 vnode
= varpool_node_for_asm (target
);
5109 fnode
= cgraph_node_for_asm (target
);
5114 /* We can't mark function nodes as used after cgraph global info
5115 is finished. This wouldn't generally be necessary, but C++
5116 virtual table thunks are introduced late in the game and
5117 might seem like they need marking, although in fact they
5119 if (! cgraph_global_info_ready
)
5120 cgraph_mark_needed_node (fnode
);
5125 varpool_mark_needed_node (vnode
);
5132 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5133 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5134 tree node is DECL to have the value of the tree node TARGET. */
5137 do_assemble_alias (tree decl
, tree target
)
5139 if (TREE_ASM_WRITTEN (decl
))
5142 TREE_ASM_WRITTEN (decl
) = 1;
5143 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5145 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5147 ultimate_transparent_alias_target (&target
);
5149 if (!targetm
.have_tls
5150 && TREE_CODE (decl
) == VAR_DECL
5151 && DECL_THREAD_LOCAL_P (decl
))
5153 decl
= emutls_decl (decl
);
5154 target
= get_emutls_object_name (target
);
5157 if (!TREE_SYMBOL_REFERENCED (target
))
5158 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5160 #ifdef ASM_OUTPUT_WEAKREF
5161 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5162 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5163 IDENTIFIER_POINTER (target
));
5167 error ("%Jweakref is not supported in this configuration", decl
);
5174 if (!targetm
.have_tls
5175 && TREE_CODE (decl
) == VAR_DECL
5176 && DECL_THREAD_LOCAL_P (decl
))
5178 decl
= emutls_decl (decl
);
5179 target
= get_emutls_object_name (target
);
5182 #ifdef ASM_OUTPUT_DEF
5183 /* Make name accessible from other files, if appropriate. */
5185 if (TREE_PUBLIC (decl
))
5187 globalize_decl (decl
);
5188 maybe_assemble_visibility (decl
);
5191 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5192 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5194 ASM_OUTPUT_DEF (asm_out_file
,
5195 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5196 IDENTIFIER_POINTER (target
));
5198 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5203 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5204 # ifdef ASM_WEAKEN_DECL
5205 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5207 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5209 /* Remove this function from the pending weak list so that
5210 we do not emit multiple .weak directives for it. */
5211 for (p
= &weak_decls
; (t
= *p
) ; )
5212 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5213 *p
= TREE_CHAIN (t
);
5215 p
= &TREE_CHAIN (t
);
5217 /* Remove weakrefs to the same target from the pending weakref
5218 list, for the same reason. */
5219 for (p
= &weakref_targets
; (t
= *p
) ; )
5221 if (DECL_ASSEMBLER_NAME (decl
)
5222 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5223 *p
= TREE_CHAIN (t
);
5225 p
= &TREE_CHAIN (t
);
5231 /* First pass of completing pending aliases. Make sure that cgraph knows
5232 which symbols will be required. */
5235 finish_aliases_1 (void)
5240 for (i
= 0; VEC_iterate (alias_pair
, alias_pairs
, i
, p
); i
++)
5244 target_decl
= find_decl_and_mark_needed (p
->decl
, p
->target
);
5245 if (target_decl
== NULL
)
5247 if (! lookup_attribute ("weakref", DECL_ATTRIBUTES (p
->decl
)))
5248 error ("%q+D aliased to undefined symbol %qs",
5249 p
->decl
, IDENTIFIER_POINTER (p
->target
));
5251 else if (DECL_EXTERNAL (target_decl
)
5252 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p
->decl
)))
5253 error ("%q+D aliased to external symbol %qs",
5254 p
->decl
, IDENTIFIER_POINTER (p
->target
));
5258 /* Second pass of completing pending aliases. Emit the actual assembly.
5259 This happens at the end of compilation and thus it is assured that the
5260 target symbol has been emitted. */
5263 finish_aliases_2 (void)
5268 for (i
= 0; VEC_iterate (alias_pair
, alias_pairs
, i
, p
); i
++)
5269 do_assemble_alias (p
->decl
, p
->target
);
5271 VEC_truncate (alias_pair
, alias_pairs
, 0);
5274 /* Emit an assembler directive to make the symbol for DECL an alias to
5275 the symbol for TARGET. */
5278 assemble_alias (tree decl
, tree target
)
5281 bool is_weakref
= false;
5283 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5285 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5289 ultimate_transparent_alias_target (&target
);
5291 if (alias
== target
)
5292 error ("weakref %q+D ultimately targets itself", decl
);
5295 #ifndef ASM_OUTPUT_WEAKREF
5296 IDENTIFIER_TRANSPARENT_ALIAS (alias
) = 1;
5297 TREE_CHAIN (alias
) = target
;
5300 if (TREE_PUBLIC (decl
))
5301 error ("weakref %q+D must have static linkage", decl
);
5305 #if !defined (ASM_OUTPUT_DEF)
5306 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5307 error ("%Jalias definitions not supported in this configuration", decl
);
5310 if (!DECL_WEAK (decl
))
5312 error ("%Jonly weak aliases are supported in this configuration", decl
);
5319 /* We must force creation of DECL_RTL for debug info generation, even though
5320 we don't use it here. */
5321 make_decl_rtl (decl
);
5322 TREE_USED (decl
) = 1;
5324 /* A quirk of the initial implementation of aliases required that the user
5325 add "extern" to all of them. Which is silly, but now historical. Do
5326 note that the symbol is in fact locally defined. */
5328 DECL_EXTERNAL (decl
) = 0;
5330 /* Allow aliases to aliases. */
5331 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5332 cgraph_node (decl
)->alias
= true;
5334 varpool_node (decl
)->alias
= true;
5336 /* If the target has already been emitted, we don't have to queue the
5337 alias. This saves a tad o memory. */
5338 target_decl
= find_decl_and_mark_needed (decl
, target
);
5339 if (target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5340 do_assemble_alias (decl
, target
);
5343 alias_pair
*p
= VEC_safe_push (alias_pair
, gc
, alias_pairs
, NULL
);
5349 /* Emit an assembler directive to set symbol for DECL visibility to
5350 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5353 default_assemble_visibility (tree decl
, int vis
)
5355 static const char * const visibility_types
[] = {
5356 NULL
, "protected", "hidden", "internal"
5359 const char *name
, *type
;
5361 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5362 type
= visibility_types
[vis
];
5364 #ifdef HAVE_GAS_HIDDEN
5365 fprintf (asm_out_file
, "\t.%s\t", type
);
5366 assemble_name (asm_out_file
, name
);
5367 fprintf (asm_out_file
, "\n");
5369 warning (OPT_Wattributes
, "visibility attribute not supported "
5370 "in this configuration; ignored");
5374 /* A helper function to call assemble_visibility when needed for a decl. */
5377 maybe_assemble_visibility (tree decl
)
5379 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5381 if (vis
!= VISIBILITY_DEFAULT
)
5383 targetm
.asm_out
.visibility (decl
, vis
);
5390 /* Returns 1 if the target configuration supports defining public symbols
5391 so that one of them will be chosen at link time instead of generating a
5392 multiply-defined symbol error, whether through the use of weak symbols or
5393 a target-specific mechanism for having duplicates discarded. */
5396 supports_one_only (void)
5398 if (SUPPORTS_ONE_ONLY
)
5400 return SUPPORTS_WEAK
;
5403 /* Set up DECL as a public symbol that can be defined in multiple
5404 translation units without generating a linker error. */
5407 make_decl_one_only (tree decl
)
5409 gcc_assert (TREE_CODE (decl
) == VAR_DECL
5410 || TREE_CODE (decl
) == FUNCTION_DECL
);
5412 TREE_PUBLIC (decl
) = 1;
5414 if (SUPPORTS_ONE_ONLY
)
5416 #ifdef MAKE_DECL_ONE_ONLY
5417 MAKE_DECL_ONE_ONLY (decl
);
5419 DECL_ONE_ONLY (decl
) = 1;
5421 else if (TREE_CODE (decl
) == VAR_DECL
5422 && (DECL_INITIAL (decl
) == 0 || DECL_INITIAL (decl
) == error_mark_node
))
5423 DECL_COMMON (decl
) = 1;
5426 gcc_assert (SUPPORTS_WEAK
);
5427 DECL_WEAK (decl
) = 1;
5432 init_varasm_once (void)
5434 section_htab
= htab_create_ggc (31, section_entry_hash
,
5435 section_entry_eq
, NULL
);
5436 object_block_htab
= htab_create_ggc (31, object_block_entry_hash
,
5437 object_block_entry_eq
, NULL
);
5438 const_desc_htab
= htab_create_ggc (1009, const_desc_hash
,
5439 const_desc_eq
, NULL
);
5441 const_alias_set
= new_alias_set ();
5442 shared_constant_pool
= create_constant_pool ();
5444 #ifdef TEXT_SECTION_ASM_OP
5445 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
5446 TEXT_SECTION_ASM_OP
);
5449 #ifdef DATA_SECTION_ASM_OP
5450 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5451 DATA_SECTION_ASM_OP
);
5454 #ifdef SDATA_SECTION_ASM_OP
5455 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5456 SDATA_SECTION_ASM_OP
);
5459 #ifdef READONLY_DATA_SECTION_ASM_OP
5460 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
5461 READONLY_DATA_SECTION_ASM_OP
);
5464 #ifdef CTORS_SECTION_ASM_OP
5465 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
5466 CTORS_SECTION_ASM_OP
);
5469 #ifdef DTORS_SECTION_ASM_OP
5470 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
5471 DTORS_SECTION_ASM_OP
);
5474 #ifdef BSS_SECTION_ASM_OP
5475 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5476 output_section_asm_op
,
5477 BSS_SECTION_ASM_OP
);
5480 #ifdef SBSS_SECTION_ASM_OP
5481 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5482 output_section_asm_op
,
5483 SBSS_SECTION_ASM_OP
);
5486 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5487 | SECTION_COMMON
, emit_tls_common
);
5488 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5489 | SECTION_COMMON
, emit_local
);
5490 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5491 | SECTION_COMMON
, emit_common
);
5493 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
5494 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
5498 targetm
.asm_out
.init_sections ();
5500 if (readonly_data_section
== NULL
)
5501 readonly_data_section
= text_section
;
5505 decl_default_tls_model (tree decl
)
5507 enum tls_model kind
;
5510 is_local
= targetm
.binds_local_p (decl
);
5514 kind
= TLS_MODEL_LOCAL_EXEC
;
5516 kind
= TLS_MODEL_INITIAL_EXEC
;
5519 /* Local dynamic is inefficient when we're not combining the
5520 parts of the address. */
5521 else if (optimize
&& is_local
)
5522 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
5524 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
5525 if (kind
< flag_tls_default
)
5526 kind
= flag_tls_default
;
5531 /* Select a set of attributes for section NAME based on the properties
5532 of DECL and whether or not RELOC indicates that DECL's initializer
5533 might contain runtime relocations.
5535 We make the section read-only and executable for a function decl,
5536 read-only for a const data decl, and writable for a non-const data decl. */
5539 default_section_type_flags (tree decl
, const char *name
, int reloc
)
5541 return default_section_type_flags_1 (decl
, name
, reloc
, flag_pic
);
5545 default_section_type_flags_1 (tree decl
, const char *name
, int reloc
,
5550 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
5551 flags
= SECTION_CODE
;
5552 else if (decl
&& decl_readonly_section_1 (decl
, reloc
, shlib
))
5554 else if (current_function_decl
5556 && cfun
->unlikely_text_section_name
5557 && strcmp (name
, cfun
->unlikely_text_section_name
) == 0)
5558 flags
= SECTION_CODE
;
5560 && (!current_function_decl
|| !cfun
)
5561 && strcmp (name
, UNLIKELY_EXECUTED_TEXT_SECTION_NAME
) == 0)
5562 flags
= SECTION_CODE
;
5564 flags
= SECTION_WRITE
;
5566 if (decl
&& DECL_ONE_ONLY (decl
))
5567 flags
|= SECTION_LINKONCE
;
5569 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
5570 flags
|= SECTION_TLS
| SECTION_WRITE
;
5572 if (strcmp (name
, ".bss") == 0
5573 || strncmp (name
, ".bss.", 5) == 0
5574 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
5575 || strcmp (name
, ".sbss") == 0
5576 || strncmp (name
, ".sbss.", 6) == 0
5577 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
5578 flags
|= SECTION_BSS
;
5580 if (strcmp (name
, ".tdata") == 0
5581 || strncmp (name
, ".tdata.", 7) == 0
5582 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
5583 flags
|= SECTION_TLS
;
5585 if (strcmp (name
, ".tbss") == 0
5586 || strncmp (name
, ".tbss.", 6) == 0
5587 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
5588 flags
|= SECTION_TLS
| SECTION_BSS
;
5590 /* These three sections have special ELF types. They are neither
5591 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
5592 want to print a section type (@progbits or @nobits). If someone
5593 is silly enough to emit code or TLS variables to one of these
5594 sections, then don't handle them specially. */
5595 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
5596 && (strcmp (name
, ".init_array") == 0
5597 || strcmp (name
, ".fini_array") == 0
5598 || strcmp (name
, ".preinit_array") == 0))
5599 flags
|= SECTION_NOTYPE
;
5604 /* Return true if the target supports some form of global BSS,
5605 either through bss_noswitch_section, or by selecting a BSS
5606 section in TARGET_ASM_SELECT_SECTION. */
5609 have_global_bss_p (void)
5611 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
5614 /* Output assembly to switch to section NAME with attribute FLAGS.
5615 Four variants for common object file formats. */
5618 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
5619 unsigned int flags ATTRIBUTE_UNUSED
,
5620 tree decl ATTRIBUTE_UNUSED
)
5622 /* Some object formats don't support named sections at all. The
5623 front-end should already have flagged this as an error. */
5628 default_elf_asm_named_section (const char *name
, unsigned int flags
,
5629 tree decl ATTRIBUTE_UNUSED
)
5631 char flagchars
[10], *f
= flagchars
;
5633 /* If we have already declared this section, we can use an
5634 abbreviated form to switch back to it -- unless this section is
5635 part of a COMDAT groups, in which case GAS requires the full
5636 declaration every time. */
5637 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
5638 && (flags
& SECTION_DECLARED
))
5640 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
5644 if (!(flags
& SECTION_DEBUG
))
5646 if (flags
& SECTION_WRITE
)
5648 if (flags
& SECTION_CODE
)
5650 if (flags
& SECTION_SMALL
)
5652 if (flags
& SECTION_MERGE
)
5654 if (flags
& SECTION_STRINGS
)
5656 if (flags
& SECTION_TLS
)
5658 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
5662 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
5664 if (!(flags
& SECTION_NOTYPE
))
5669 if (flags
& SECTION_BSS
)
5675 #ifdef ASM_COMMENT_START
5676 /* On platforms that use "@" as the assembly comment character,
5678 if (strcmp (ASM_COMMENT_START
, "@") == 0)
5681 fprintf (asm_out_file
, format
, type
);
5683 if (flags
& SECTION_ENTSIZE
)
5684 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
5685 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
5686 fprintf (asm_out_file
, ",%s,comdat",
5687 lang_hooks
.decls
.comdat_group (decl
));
5690 putc ('\n', asm_out_file
);
5694 default_coff_asm_named_section (const char *name
, unsigned int flags
,
5695 tree decl ATTRIBUTE_UNUSED
)
5697 char flagchars
[8], *f
= flagchars
;
5699 if (flags
& SECTION_WRITE
)
5701 if (flags
& SECTION_CODE
)
5705 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
5709 default_pe_asm_named_section (const char *name
, unsigned int flags
,
5712 default_coff_asm_named_section (name
, flags
, decl
);
5714 if (flags
& SECTION_LINKONCE
)
5716 /* Functions may have been compiled at various levels of
5717 optimization so we can't use `same_size' here.
5718 Instead, have the linker pick one. */
5719 fprintf (asm_out_file
, "\t.linkonce %s\n",
5720 (flags
& SECTION_CODE
? "discard" : "same_size"));
5724 /* The lame default section selector. */
5727 default_select_section (tree decl
, int reloc
,
5728 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
5732 if (decl_readonly_section (decl
, reloc
))
5733 return readonly_data_section
;
5735 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
5737 if (! ((flag_pic
&& reloc
)
5738 || !TREE_READONLY (decl
)
5739 || TREE_SIDE_EFFECTS (decl
)
5740 || !TREE_CONSTANT (decl
)))
5741 return readonly_data_section
;
5743 else if (TREE_CODE (decl
) == STRING_CST
)
5744 return readonly_data_section
;
5745 else if (! (flag_pic
&& reloc
))
5746 return readonly_data_section
;
5748 return data_section
;
5751 enum section_category
5752 categorize_decl_for_section (tree decl
, int reloc
, int shlib
)
5754 enum section_category ret
;
5756 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5758 else if (TREE_CODE (decl
) == STRING_CST
)
5760 if (flag_mudflap
) /* or !flag_merge_constants */
5761 return SECCAT_RODATA
;
5763 return SECCAT_RODATA_MERGE_STR
;
5765 else if (TREE_CODE (decl
) == VAR_DECL
)
5767 if (bss_initializer_p (decl
))
5769 else if (! TREE_READONLY (decl
)
5770 || TREE_SIDE_EFFECTS (decl
)
5771 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
5773 if (shlib
&& (reloc
& 2))
5774 ret
= SECCAT_DATA_REL
;
5775 else if (shlib
&& reloc
)
5776 ret
= SECCAT_DATA_REL_LOCAL
;
5780 else if (shlib
&& (reloc
& 2))
5781 ret
= SECCAT_DATA_REL_RO
;
5782 else if (shlib
&& reloc
)
5783 ret
= SECCAT_DATA_REL_RO_LOCAL
;
5784 else if (reloc
|| flag_merge_constants
< 2)
5785 /* C and C++ don't allow different variables to share the same
5786 location. -fmerge-all-constants allows even that (at the
5787 expense of not conforming). */
5788 ret
= SECCAT_RODATA
;
5789 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
5790 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
5792 ret
= SECCAT_RODATA_MERGE_CONST
;
5794 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
5796 if ((shlib
&& reloc
)
5797 || TREE_SIDE_EFFECTS (decl
)
5798 || ! TREE_CONSTANT (decl
))
5801 ret
= SECCAT_RODATA
;
5804 ret
= SECCAT_RODATA
;
5806 /* There are no read-only thread-local sections. */
5807 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
5809 /* Note that this would be *just* SECCAT_BSS, except that there's
5810 no concept of a read-only thread-local-data section. */
5811 if (ret
== SECCAT_BSS
5812 || (flag_zero_initialized_in_bss
5813 && initializer_zerop (DECL_INITIAL (decl
))))
5819 /* If the target uses small data sections, select it. */
5820 else if (targetm
.in_small_data_p (decl
))
5822 if (ret
== SECCAT_BSS
)
5824 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
5825 ret
= SECCAT_SRODATA
;
5834 decl_readonly_section (tree decl
, int reloc
)
5836 return decl_readonly_section_1 (decl
, reloc
, flag_pic
);
5840 decl_readonly_section_1 (tree decl
, int reloc
, int shlib
)
5842 switch (categorize_decl_for_section (decl
, reloc
, shlib
))
5845 case SECCAT_RODATA_MERGE_STR
:
5846 case SECCAT_RODATA_MERGE_STR_INIT
:
5847 case SECCAT_RODATA_MERGE_CONST
:
5848 case SECCAT_SRODATA
:
5857 /* Select a section based on the above categorization. */
5860 default_elf_select_section (tree decl
, int reloc
,
5861 unsigned HOST_WIDE_INT align
)
5863 return default_elf_select_section_1 (decl
, reloc
, align
, flag_pic
);
5867 default_elf_select_section_1 (tree decl
, int reloc
,
5868 unsigned HOST_WIDE_INT align
, int shlib
)
5871 switch (categorize_decl_for_section (decl
, reloc
, shlib
))
5874 /* We're not supposed to be called on FUNCTION_DECLs. */
5877 return readonly_data_section
;
5878 case SECCAT_RODATA_MERGE_STR
:
5879 return mergeable_string_section (decl
, align
, 0);
5880 case SECCAT_RODATA_MERGE_STR_INIT
:
5881 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
5882 case SECCAT_RODATA_MERGE_CONST
:
5883 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
5884 case SECCAT_SRODATA
:
5888 return data_section
;
5889 case SECCAT_DATA_REL
:
5890 sname
= ".data.rel";
5892 case SECCAT_DATA_REL_LOCAL
:
5893 sname
= ".data.rel.local";
5895 case SECCAT_DATA_REL_RO
:
5896 sname
= ".data.rel.ro";
5898 case SECCAT_DATA_REL_RO_LOCAL
:
5899 sname
= ".data.rel.ro.local";
5924 return get_named_section (decl
, sname
, reloc
);
5927 /* Construct a unique section name based on the decl name and the
5928 categorization performed above. */
5931 default_unique_section (tree decl
, int reloc
)
5933 default_unique_section_1 (decl
, reloc
, flag_pic
);
5937 default_unique_section_1 (tree decl
, int reloc
, int shlib
)
5939 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
5940 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
5941 const char *prefix
, *name
;
5945 switch (categorize_decl_for_section (decl
, reloc
, shlib
))
5948 prefix
= one_only
? ".gnu.linkonce.t." : ".text.";
5951 case SECCAT_RODATA_MERGE_STR
:
5952 case SECCAT_RODATA_MERGE_STR_INIT
:
5953 case SECCAT_RODATA_MERGE_CONST
:
5954 prefix
= one_only
? ".gnu.linkonce.r." : ".rodata.";
5956 case SECCAT_SRODATA
:
5957 prefix
= one_only
? ".gnu.linkonce.s2." : ".sdata2.";
5960 prefix
= one_only
? ".gnu.linkonce.d." : ".data.";
5962 case SECCAT_DATA_REL
:
5963 prefix
= one_only
? ".gnu.linkonce.d.rel." : ".data.rel.";
5965 case SECCAT_DATA_REL_LOCAL
:
5966 prefix
= one_only
? ".gnu.linkonce.d.rel.local." : ".data.rel.local.";
5968 case SECCAT_DATA_REL_RO
:
5969 prefix
= one_only
? ".gnu.linkonce.d.rel.ro." : ".data.rel.ro.";
5971 case SECCAT_DATA_REL_RO_LOCAL
:
5972 prefix
= one_only
? ".gnu.linkonce.d.rel.ro.local."
5973 : ".data.rel.ro.local.";
5976 prefix
= one_only
? ".gnu.linkonce.s." : ".sdata.";
5979 prefix
= one_only
? ".gnu.linkonce.b." : ".bss.";
5982 prefix
= one_only
? ".gnu.linkonce.sb." : ".sbss.";
5985 prefix
= one_only
? ".gnu.linkonce.td." : ".tdata.";
5988 prefix
= one_only
? ".gnu.linkonce.tb." : ".tbss.";
5993 plen
= strlen (prefix
);
5995 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5996 name
= targetm
.strip_name_encoding (name
);
5997 nlen
= strlen (name
);
5999 string
= alloca (nlen
+ plen
+ 1);
6000 memcpy (string
, prefix
, plen
);
6001 memcpy (string
+ plen
, name
, nlen
+ 1);
6003 DECL_SECTION_NAME (decl
) = build_string (nlen
+ plen
, string
);
6007 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
6009 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6012 switch (GET_CODE (x
))
6017 return data_section
;
6023 return readonly_data_section
;
6027 default_elf_select_rtx_section (enum machine_mode mode
, rtx x
,
6028 unsigned HOST_WIDE_INT align
)
6030 /* ??? Handle small data here somehow. */
6033 switch (GET_CODE (x
))
6037 return get_named_section (NULL
, ".data.rel.ro", 3);
6040 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6046 return mergeable_constant_section (mode
, align
, 0);
6049 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6052 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6057 /* Careful not to prod global register variables. */
6060 symbol
= XEXP (rtl
, 0);
6061 if (GET_CODE (symbol
) != SYMBOL_REF
)
6064 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6065 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6066 flags
|= SYMBOL_FLAG_FUNCTION
;
6067 if (targetm
.binds_local_p (decl
))
6068 flags
|= SYMBOL_FLAG_LOCAL
;
6069 if (targetm
.have_tls
&& TREE_CODE (decl
) == VAR_DECL
6070 && DECL_THREAD_LOCAL_P (decl
))
6071 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6072 else if (targetm
.in_small_data_p (decl
))
6073 flags
|= SYMBOL_FLAG_SMALL
;
6074 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6075 being PUBLIC, the thing *must* be defined in this translation unit.
6076 Prevent this buglet from being propagated into rtl code as well. */
6077 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6078 flags
|= SYMBOL_FLAG_EXTERNAL
;
6080 SYMBOL_REF_FLAGS (symbol
) = flags
;
6083 /* By default, we do nothing for encode_section_info, so we need not
6084 do anything but discard the '*' marker. */
6087 default_strip_name_encoding (const char *str
)
6089 return str
+ (*str
== '*');
6092 #ifdef ASM_OUTPUT_DEF
6093 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6094 anchor relative to ".", the current section position. */
6097 default_asm_output_anchor (rtx symbol
)
6101 sprintf (buffer
, ". + " HOST_WIDE_INT_PRINT_DEC
,
6102 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6103 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6107 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6110 default_use_anchors_for_symbol_p (rtx symbol
)
6115 /* Don't use anchors for mergeable sections. The linker might move
6116 the objects around. */
6117 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6118 if (sect
->common
.flags
& SECTION_MERGE
)
6121 /* Don't use anchors for small data sections. The small data register
6122 acts as an anchor for such sections. */
6123 if (sect
->common
.flags
& SECTION_SMALL
)
6126 decl
= SYMBOL_REF_DECL (symbol
);
6127 if (decl
&& DECL_P (decl
))
6129 /* Don't use section anchors for decls that might be defined by
6131 if (!targetm
.binds_local_p (decl
))
6134 /* Don't use section anchors for decls that will be placed in a
6135 small data section. */
6136 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6137 one above. The problem is that we only use SECTION_SMALL for
6138 sections that should be marked as small in the section directive. */
6139 if (targetm
.in_small_data_p (decl
))
6145 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6146 wrt cross-module name binding. */
6149 default_binds_local_p (tree exp
)
6151 return default_binds_local_p_1 (exp
, flag_shlib
);
6155 default_binds_local_p_1 (tree exp
, int shlib
)
6159 /* A non-decl is an entry in the constant pool. */
6162 /* Weakrefs may not bind locally, even though the weakref itself is
6163 always static and therefore local. */
6164 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
)))
6166 /* Static variables are always local. */
6167 else if (! TREE_PUBLIC (exp
))
6169 /* A variable is local if the user has said explicitly that it will
6171 else if (DECL_VISIBILITY_SPECIFIED (exp
)
6172 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6174 /* Variables defined outside this object might not be local. */
6175 else if (DECL_EXTERNAL (exp
))
6177 /* If defined in this object and visibility is not default, must be
6179 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6181 /* Default visibility weak data can be overridden by a strong symbol
6182 in another module and so are not local. */
6183 else if (DECL_WEAK (exp
))
6185 /* If PIC, then assume that any global name can be overridden by
6186 symbols resolved from other modules. */
6189 /* Uninitialized COMMON variable may be unified with symbols
6190 resolved from other modules. */
6191 else if (DECL_COMMON (exp
)
6192 && (DECL_INITIAL (exp
) == NULL
6193 || DECL_INITIAL (exp
) == error_mark_node
))
6195 /* Otherwise we're left with initialized (or non-common) global data
6196 which is of necessity defined locally. */
6203 /* Determine whether or not a pointer mode is valid. Assume defaults
6204 of ptr_mode or Pmode - can be overridden. */
6206 default_valid_pointer_mode (enum machine_mode mode
)
6208 return (mode
== ptr_mode
|| mode
== Pmode
);
6211 /* Default function to output code that will globalize a label. A
6212 target must define GLOBAL_ASM_OP or provide its own function to
6213 globalize a label. */
6214 #ifdef GLOBAL_ASM_OP
6216 default_globalize_label (FILE * stream
, const char *name
)
6218 fputs (GLOBAL_ASM_OP
, stream
);
6219 assemble_name (stream
, name
);
6220 putc ('\n', stream
);
6222 #endif /* GLOBAL_ASM_OP */
6224 /* Default function to output code that will globalize a declaration. */
6226 default_globalize_decl_name (FILE * stream
, tree decl
)
6228 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6229 targetm
.asm_out
.globalize_label (stream
, name
);
6232 /* Default function to output a label for unwind information. The
6233 default is to do nothing. A target that needs nonlocal labels for
6234 unwind information must provide its own function to do this. */
6236 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6237 tree decl ATTRIBUTE_UNUSED
,
6238 int for_eh ATTRIBUTE_UNUSED
,
6239 int empty ATTRIBUTE_UNUSED
)
6243 /* Default function to output a label to divide up the exception table.
6244 The default is to do nothing. A target that needs/wants to divide
6245 up the table must provide it's own function to do this. */
6247 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
6251 /* This is how to output an internal numbered label where PREFIX is
6252 the class of label and LABELNO is the number within the class. */
6255 default_internal_label (FILE *stream
, const char *prefix
,
6256 unsigned long labelno
)
6258 char *const buf
= alloca (40 + strlen (prefix
));
6259 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6260 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
6263 /* This is the default behavior at the beginning of a file. It's
6264 controlled by two other target-hook toggles. */
6266 default_file_start (void)
6268 if (targetm
.file_start_app_off
&& !flag_verbose_asm
)
6269 fputs (ASM_APP_OFF
, asm_out_file
);
6271 if (targetm
.file_start_file_directive
)
6272 output_file_directive (asm_out_file
, main_input_filename
);
6275 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6276 which emits a special section directive used to indicate whether or
6277 not this object file needs an executable stack. This is primarily
6278 a GNU extension to ELF but could be used on other targets. */
6280 int trampolines_created
;
6283 file_end_indicate_exec_stack (void)
6285 unsigned int flags
= SECTION_DEBUG
;
6286 if (trampolines_created
)
6287 flags
|= SECTION_CODE
;
6289 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
6292 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6293 a get_unnamed_section callback. */
6296 output_section_asm_op (const void *directive
)
6298 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
6301 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6302 the current section is NEW_SECTION. */
6305 switch_to_section (section
*new_section
)
6307 if (in_section
== new_section
)
6310 if (new_section
->common
.flags
& SECTION_FORGET
)
6313 in_section
= new_section
;
6315 switch (SECTION_STYLE (new_section
))
6319 && !cfun
->unlikely_text_section_name
6320 && strcmp (new_section
->named
.name
,
6321 UNLIKELY_EXECUTED_TEXT_SECTION_NAME
) == 0)
6322 cfun
->unlikely_text_section_name
= UNLIKELY_EXECUTED_TEXT_SECTION_NAME
;
6324 targetm
.asm_out
.named_section (new_section
->named
.name
,
6325 new_section
->named
.common
.flags
,
6326 new_section
->named
.decl
);
6329 case SECTION_UNNAMED
:
6330 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
6333 case SECTION_NOSWITCH
:
6338 new_section
->common
.flags
|= SECTION_DECLARED
;
6341 /* If block symbol SYMBOL has not yet been assigned an offset, place
6342 it at the end of its block. */
6345 place_block_symbol (rtx symbol
)
6347 unsigned HOST_WIDE_INT size
, mask
, offset
;
6348 struct constant_descriptor_rtx
*desc
;
6349 unsigned int alignment
;
6350 struct object_block
*block
;
6353 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
6354 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
6357 /* Work out the symbol's size and alignment. */
6358 if (CONSTANT_POOL_ADDRESS_P (symbol
))
6360 desc
= SYMBOL_REF_CONSTANT (symbol
);
6361 alignment
= desc
->align
;
6362 size
= GET_MODE_SIZE (desc
->mode
);
6364 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
6366 decl
= SYMBOL_REF_DECL (symbol
);
6367 alignment
= get_constant_alignment (decl
);
6368 size
= get_constant_size (decl
);
6372 decl
= SYMBOL_REF_DECL (symbol
);
6373 alignment
= DECL_ALIGN (decl
);
6374 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
6377 /* Calculate the object's offset from the start of the block. */
6378 block
= SYMBOL_REF_BLOCK (symbol
);
6379 mask
= alignment
/ BITS_PER_UNIT
- 1;
6380 offset
= (block
->size
+ mask
) & ~mask
;
6381 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
6383 /* Record the block's new alignment and size. */
6384 block
->alignment
= MAX (block
->alignment
, alignment
);
6385 block
->size
= offset
+ size
;
6387 VEC_safe_push (rtx
, gc
, block
->objects
, symbol
);
6390 /* Return the anchor that should be used to address byte offset OFFSET
6391 from the first object in BLOCK. MODEL is the TLS model used
6395 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
6396 enum tls_model model
)
6399 unsigned int begin
, middle
, end
;
6400 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
6403 /* Work out the anchor's offset. Use an offset of 0 for the first
6404 anchor so that we don't pessimize the case where we take the address
6405 of a variable at the beginning of the block. This is particularly
6406 useful when a block has only one variable assigned to it.
6408 We try to place anchors RANGE bytes apart, so there can then be
6409 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
6410 a ptr_mode offset. With some target settings, the lowest such
6411 anchor might be out of range for the lowest ptr_mode offset;
6412 likewise the highest anchor for the highest offset. Use anchors
6413 at the extreme ends of the ptr_mode range in such cases.
6415 All arithmetic uses unsigned integers in order to avoid
6417 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
6418 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
6419 range
= max_offset
- min_offset
+ 1;
6424 bias
= 1 << (GET_MODE_BITSIZE (ptr_mode
) - 1);
6427 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
6428 delta
-= delta
% range
;
6431 offset
= (HOST_WIDE_INT
) (-delta
);
6435 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
6436 delta
-= delta
% range
;
6437 if (delta
> bias
- 1)
6439 offset
= (HOST_WIDE_INT
) delta
;
6443 /* Do a binary search to see if there's already an anchor we can use.
6444 Set BEGIN to the new anchor's index if not. */
6446 end
= VEC_length (rtx
, block
->anchors
);
6447 while (begin
!= end
)
6449 middle
= (end
+ begin
) / 2;
6450 anchor
= VEC_index (rtx
, block
->anchors
, middle
);
6451 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
6453 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
6455 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
6457 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
6463 /* Create a new anchor with a unique label. */
6464 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
6465 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
6466 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
6467 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
6469 /* Insert it at index BEGIN. */
6470 VEC_safe_insert (rtx
, gc
, block
->anchors
, begin
, anchor
);
6474 /* Output the objects in BLOCK. */
6477 output_object_block (struct object_block
*block
)
6479 struct constant_descriptor_rtx
*desc
;
6481 HOST_WIDE_INT offset
;
6485 if (block
->objects
== NULL
)
6488 /* Switch to the section and make sure that the first byte is
6489 suitably aligned. */
6490 switch_to_section (block
->sect
);
6491 assemble_align (block
->alignment
);
6493 /* Define the values of all anchors relative to the current section
6495 for (i
= 0; VEC_iterate (rtx
, block
->anchors
, i
, symbol
); i
++)
6496 targetm
.asm_out
.output_anchor (symbol
);
6498 /* Output the objects themselves. */
6500 for (i
= 0; VEC_iterate (rtx
, block
->objects
, i
, symbol
); i
++)
6502 /* Move to the object's offset, padding with zeros if necessary. */
6503 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
6504 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
6505 if (CONSTANT_POOL_ADDRESS_P (symbol
))
6507 desc
= SYMBOL_REF_CONSTANT (symbol
);
6508 output_constant_pool_1 (desc
, 1);
6509 offset
+= GET_MODE_SIZE (desc
->mode
);
6511 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
6513 decl
= SYMBOL_REF_DECL (symbol
);
6514 assemble_constant_contents (decl
, XSTR (symbol
, 0),
6515 get_constant_alignment (decl
));
6516 offset
+= get_constant_size (decl
);
6520 decl
= SYMBOL_REF_DECL (symbol
);
6521 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
6522 offset
+= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
6527 /* A htab_traverse callback used to call output_object_block for
6528 each member of object_block_htab. */
6531 output_object_block_htab (void **slot
, void *data ATTRIBUTE_UNUSED
)
6533 output_object_block ((struct object_block
*) (*slot
));
6537 /* Output the definitions of all object_blocks. */
6540 output_object_blocks (void)
6542 htab_traverse (object_block_htab
, output_object_block_htab
, NULL
);
6545 /* This function provides a possible implementation of the
6546 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
6547 by -frecord-gcc-switches it creates a new mergeable, string section in the
6548 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
6549 contains the switches in ASCII format.
6551 FIXME: This code does not correctly handle double quote characters
6552 that appear inside strings, (it strips them rather than preserving them).
6553 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
6554 characters - instead it treats them as sub-string separators. Since
6555 we want to emit NUL strings terminators into the object file we have to use
6559 elf_record_gcc_switches (print_switch_type type
, const char * name
)
6561 static char buffer
[1024];
6563 /* This variable is used as part of a simplistic heuristic to detect
6564 command line switches which take an argument:
6566 "If a command line option does not start with a dash then
6567 it is an argument for the previous command line option."
6569 This fails in the case of the command line option which is the name
6570 of the file to compile, but otherwise it is pretty reasonable. */
6571 static bool previous_name_held_back
= FALSE
;
6575 case SWITCH_TYPE_PASSED
:
6578 if (previous_name_held_back
)
6580 unsigned int len
= strlen (buffer
);
6582 snprintf (buffer
+ len
, sizeof buffer
- len
, " %s", name
);
6583 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6584 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6585 previous_name_held_back
= FALSE
;
6589 strncpy (buffer
, name
, sizeof buffer
);
6590 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6591 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6596 if (previous_name_held_back
)
6598 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6599 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6602 strncpy (buffer
, name
, sizeof buffer
);
6603 previous_name_held_back
= TRUE
;
6607 case SWITCH_TYPE_DESCRIPTIVE
:
6610 /* Distinguish between invocations where name is NULL. */
6611 static bool started
= false;
6615 if (previous_name_held_back
)
6617 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6618 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6625 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
6629 | (SECTION_ENTSIZE
& 1),
6631 switch_to_section (sec
);
6640 /* The return value is currently ignored by the caller, but must be 0.
6641 For -fverbose-asm the return value would be the number of characters
6642 emitted into the assembler file. */
6646 /* Emit text to declare externally defined symbols. It is needed to
6647 properly support non-default visibility. */
6649 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
6651 const char *name ATTRIBUTE_UNUSED
)
6653 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
6654 set in order to avoid putting out names that are never really
6656 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
6657 && targetm
.binds_local_p (decl
))
6658 maybe_assemble_visibility (decl
);
6661 #include "gt-varasm.h"