1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997,
3 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
4 2010 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
23 /* This file handles generation of all the assembler code
24 *except* the instructions of a function.
25 This includes declarations of variables and their initial values.
27 We also output the assembler code for constants stored in memory
28 and are responsible for combining constants with the same value. */
32 #include "coretypes.h"
39 #include "hard-reg-set.h"
46 #include "langhooks.h"
50 #include "targhooks.h"
51 #include "tree-mudflap.h"
53 #include "cfglayout.h"
54 #include "basic-block.h"
55 #include "tree-iterator.h"
57 #ifdef XCOFF_DEBUGGING_INFO
58 #include "xcoffout.h" /* Needed for external data
59 declarations for e.g. AIX 4.x. */
62 /* The (assembler) name of the first globally-visible object output. */
63 extern GTY(()) const char *first_global_object_name;
64 extern GTY(()) const char *weak_global_object_name;
66 const char *first_global_object_name;
67 const char *weak_global_object_name;
70 struct constant_descriptor_rtx;
71 struct rtx_constant_pool;
73 #define n_deferred_constants (crtl->varasm.deferred_constants)
75 /* Number for making the label on the next
76 constant that is stored in memory. */
78 static GTY(()) int const_labelno;
80 /* Carry information from ASM_DECLARE_OBJECT_NAME
81 to ASM_FINISH_DECLARE_OBJECT. */
83 int size_directive_output;
85 /* The last decl for which assemble_variable was called,
86 if it did ASM_DECLARE_OBJECT_NAME.
87 If the last call to assemble_variable didn't do that,
90 tree last_assemble_variable_decl;
92 /* The following global variable indicates if the first basic block
93 in a function belongs to the cold partition or not. */
95 bool first_function_block_is_cold;
97 /* We give all constants their own alias set. Perhaps redundant with
98 MEM_READONLY_P, but pre-dates it. */
100 static alias_set_type const_alias_set;
102 static const char *strip_reg_name (const char *);
103 static int contains_pointers_p (tree);
104 #ifdef ASM_OUTPUT_EXTERNAL
105 static bool incorporeal_function_p (tree);
107 static void decode_addr_const (tree, struct addr_const *);
108 static hashval_t const_desc_hash (const void *);
109 static int const_desc_eq (const void *, const void *);
110 static hashval_t const_hash_1 (const tree);
111 static int compare_constant (const tree, const tree);
112 static tree copy_constant (tree);
113 static void output_constant_def_contents (rtx);
114 static void output_addressed_constants (tree);
115 static unsigned HOST_WIDE_INT array_size_for_constructor (tree);
116 static unsigned min_align (unsigned, unsigned);
117 static void globalize_decl (tree);
118 #ifdef BSS_SECTION_ASM_OP
119 #ifdef ASM_OUTPUT_BSS
120 static void asm_output_bss (FILE *, tree, const char *,
121 unsigned HOST_WIDE_INT, unsigned HOST_WIDE_INT);
123 #ifdef ASM_OUTPUT_ALIGNED_BSS
124 static void asm_output_aligned_bss (FILE *, tree, const char *,
125 unsigned HOST_WIDE_INT, int)
128 #endif /* BSS_SECTION_ASM_OP */
129 static void mark_weak (tree);
130 static void output_constant_pool (const char *, tree);
132 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
133 section *text_section;
134 section *data_section;
135 section *readonly_data_section;
136 section *sdata_section;
137 section *ctors_section;
138 section *dtors_section;
139 section *bss_section;
140 section *sbss_section;
142 /* Various forms of common section. All are guaranteed to be nonnull. */
143 section *tls_comm_section;
144 section *comm_section;
145 section *lcomm_section;
147 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
149 section *bss_noswitch_section;
151 /* The section that holds the main exception table, when known. The section
152 is set either by the target's init_sections hook or by the first call to
153 switch_to_exception_section. */
154 section *exception_section;
156 /* The section that holds the DWARF2 frame unwind information, when known.
157 The section is set either by the target's init_sections hook or by the
158 first call to switch_to_eh_frame_section. */
159 section *eh_frame_section;
161 /* asm_out_file's current section. This is NULL if no section has yet
162 been selected or if we lose track of what the current section is. */
165 /* True if code for the current function is currently being directed
166 at the cold section. */
167 bool in_cold_section_p;
169 /* A linked list of all the unnamed sections. */
170 static GTY(()) section *unnamed_sections;
172 /* Return a nonzero value if DECL has a section attribute. */
173 #ifndef IN_NAMED_SECTION
174 #define IN_NAMED_SECTION(DECL) \
175 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
176 && DECL_SECTION_NAME (DECL) != NULL_TREE)
179 /* Hash table of named sections. */
180 static GTY((param_is (section))) htab_t section_htab;
182 /* A table of object_blocks, indexed by section. */
183 static GTY((param_is (struct object_block))) htab_t object_block_htab;
185 /* The next number to use for internal anchor labels. */
186 static GTY(()) int anchor_labelno;
188 /* A pool of constants that can be shared between functions. */
189 static GTY(()) struct rtx_constant_pool *shared_constant_pool;
193 static GTY ((if_marked ("tree_map_marked_p"), param_is (struct tree_map)))
195 static GTY (()) tree emutls_object_type;
196 /* Emulated TLS objects have the TLS model TLS_MODEL_EMULATED. This
197 macro can be used on them to distinguish the control variable from
198 the initialization template. */
199 #define DECL_EMUTLS_VAR_P(D) (TREE_TYPE (D) == emutls_object_type)
201 #if !defined (NO_DOT_IN_LABEL)
202 # define EMUTLS_SEPARATOR "."
203 #elif !defined (NO_DOLLAR_IN_LABEL)
204 # define EMUTLS_SEPARATOR "$"
206 # define EMUTLS_SEPARATOR "_"
209 /* Create an IDENTIFIER_NODE by prefixing PREFIX to the
210 IDENTIFIER_NODE NAME's name. */
213 prefix_name (const char *prefix, tree name)
215 unsigned plen = strlen (prefix);
216 unsigned nlen = strlen (IDENTIFIER_POINTER (name));
217 char *toname = (char *) alloca (plen + nlen + 1);
219 memcpy (toname, prefix, plen);
220 memcpy (toname + plen, IDENTIFIER_POINTER (name), nlen + 1);
222 return get_identifier (toname);
225 /* Create an identifier for the struct __emutls_object, given an identifier
226 of the DECL_ASSEMBLY_NAME of the original object. */
229 get_emutls_object_name (tree name)
231 const char *prefix = (targetm.emutls.var_prefix
232 ? targetm.emutls.var_prefix
233 : "__emutls_v" EMUTLS_SEPARATOR);
234 return prefix_name (prefix, name);
238 default_emutls_var_fields (tree type, tree *name ATTRIBUTE_UNUSED)
240 tree word_type_node, field, next_field;
242 field = build_decl (UNKNOWN_LOCATION,
243 FIELD_DECL, get_identifier ("__templ"), ptr_type_node);
244 DECL_CONTEXT (field) = type;
247 field = build_decl (UNKNOWN_LOCATION,
248 FIELD_DECL, get_identifier ("__offset"),
250 DECL_CONTEXT (field) = type;
251 TREE_CHAIN (field) = next_field;
254 word_type_node = lang_hooks.types.type_for_mode (word_mode, 1);
255 field = build_decl (UNKNOWN_LOCATION,
256 FIELD_DECL, get_identifier ("__align"),
258 DECL_CONTEXT (field) = type;
259 TREE_CHAIN (field) = next_field;
262 field = build_decl (UNKNOWN_LOCATION,
263 FIELD_DECL, get_identifier ("__size"), word_type_node);
264 DECL_CONTEXT (field) = type;
265 TREE_CHAIN (field) = next_field;
270 /* Create the structure for struct __emutls_object. This should match the
271 structure at the top of emutls.c, modulo the union there. */
274 get_emutls_object_type (void)
276 tree type, type_name, field;
278 type = emutls_object_type;
282 emutls_object_type = type = lang_hooks.types.make_type (RECORD_TYPE);
284 field = targetm.emutls.var_fields (type, &type_name);
286 type_name = get_identifier ("__emutls_object");
287 type_name = build_decl (UNKNOWN_LOCATION,
288 TYPE_DECL, type_name, type);
289 TYPE_NAME (type) = type_name;
290 TYPE_FIELDS (type) = field;
296 /* Create a read-only variable like DECL, with the same DECL_INITIAL.
297 This will be used for initializing the emulated tls data area. */
300 get_emutls_init_templ_addr (tree decl)
304 if (targetm.emutls.register_common && !DECL_INITIAL (decl)
305 && !DECL_SECTION_NAME (decl))
306 return null_pointer_node;
308 name = DECL_ASSEMBLER_NAME (decl);
309 if (!targetm.emutls.tmpl_prefix || targetm.emutls.tmpl_prefix[0])
311 const char *prefix = (targetm.emutls.tmpl_prefix
312 ? targetm.emutls.tmpl_prefix
313 : "__emutls_t" EMUTLS_SEPARATOR);
314 name = prefix_name (prefix, name);
317 to = build_decl (DECL_SOURCE_LOCATION (decl),
318 VAR_DECL, name, TREE_TYPE (decl));
319 SET_DECL_ASSEMBLER_NAME (to, DECL_NAME (to));
320 DECL_TLS_MODEL (to) = TLS_MODEL_EMULATED;
321 DECL_ARTIFICIAL (to) = 1;
322 TREE_USED (to) = TREE_USED (decl);
323 TREE_READONLY (to) = 1;
324 DECL_IGNORED_P (to) = 1;
325 DECL_CONTEXT (to) = DECL_CONTEXT (decl);
326 DECL_SECTION_NAME (to) = DECL_SECTION_NAME (decl);
328 DECL_WEAK (to) = DECL_WEAK (decl);
329 if (DECL_ONE_ONLY (decl))
331 make_decl_one_only (to, DECL_ASSEMBLER_NAME (to));
332 TREE_STATIC (to) = TREE_STATIC (decl);
333 TREE_PUBLIC (to) = TREE_PUBLIC (decl);
334 DECL_VISIBILITY (to) = DECL_VISIBILITY (decl);
337 TREE_STATIC (to) = 1;
339 DECL_INITIAL (to) = DECL_INITIAL (decl);
340 DECL_INITIAL (decl) = NULL;
342 varpool_finalize_decl (to);
343 return build_fold_addr_expr (to);
346 /* When emulating tls, we use a control structure for use by the runtime.
347 Create and return this structure. */
350 emutls_decl (tree decl)
353 struct tree_map *h, in;
356 if (targetm.have_tls || decl == NULL || decl == error_mark_node
357 || TREE_CODE (decl) != VAR_DECL || ! DECL_THREAD_LOCAL_P (decl))
360 /* Look up the object in the hash; return the control structure if
361 it has already been created. */
363 emutls_htab = htab_create_ggc (512, tree_map_hash, tree_map_eq, 0);
365 name = DECL_ASSEMBLER_NAME (decl);
367 /* Note that we use the hash of the decl's name, rather than a hash
368 of the decl's pointer. In emutls_finish we iterate through the
369 hash table, and we want this traversal to be predictable. */
370 in.hash = htab_hash_string (IDENTIFIER_POINTER (name));
372 loc = htab_find_slot_with_hash (emutls_htab, &in, in.hash, INSERT);
373 h = (struct tree_map *) *loc;
378 to = build_decl (DECL_SOURCE_LOCATION (decl),
379 VAR_DECL, get_emutls_object_name (name),
380 get_emutls_object_type ());
382 h = GGC_NEW (struct tree_map);
386 *(struct tree_map **) loc = h;
388 DECL_TLS_MODEL (to) = TLS_MODEL_EMULATED;
389 DECL_ARTIFICIAL (to) = 1;
390 DECL_IGNORED_P (to) = 1;
391 TREE_READONLY (to) = 0;
392 SET_DECL_ASSEMBLER_NAME (to, DECL_NAME (to));
393 if (DECL_ONE_ONLY (decl))
394 make_decl_one_only (to, DECL_ASSEMBLER_NAME (to));
395 DECL_CONTEXT (to) = DECL_CONTEXT (decl);
396 if (targetm.emutls.var_align_fixed)
397 /* If we're not allowed to change the proxy object's
398 alignment, pretend it's been set by the user. */
399 DECL_USER_ALIGN (to) = 1;
402 /* Note that these fields may need to be updated from time to time from
403 the original decl. Consider:
404 extern __thread int i;
405 int foo() { return i; }
407 in which I goes from external to locally defined and initialized. */
409 TREE_STATIC (to) = TREE_STATIC (decl);
410 TREE_USED (to) = TREE_USED (decl);
411 TREE_PUBLIC (to) = TREE_PUBLIC (decl);
412 DECL_EXTERNAL (to) = DECL_EXTERNAL (decl);
413 DECL_COMMON (to) = DECL_COMMON (decl);
414 DECL_WEAK (to) = DECL_WEAK (decl);
415 DECL_VISIBILITY (to) = DECL_VISIBILITY (decl);
421 emutls_common_1 (void **loc, void *xstmts)
423 struct tree_map *h = *(struct tree_map **) loc;
424 tree args, x, *pstmts = (tree *) xstmts;
427 if (! DECL_COMMON (h->base.from)
428 || (DECL_INITIAL (h->base.from)
429 && DECL_INITIAL (h->base.from) != error_mark_node))
432 word_type_node = lang_hooks.types.type_for_mode (word_mode, 1);
434 /* The idea was to call get_emutls_init_templ_addr here, but if we
435 do this and there is an initializer, -fanchor_section loses,
436 because it would be too late to ensure the template is
438 x = null_pointer_node;
439 args = tree_cons (NULL, x, NULL);
440 x = build_int_cst (word_type_node, DECL_ALIGN_UNIT (h->base.from));
441 args = tree_cons (NULL, x, args);
442 x = fold_convert (word_type_node, DECL_SIZE_UNIT (h->base.from));
443 args = tree_cons (NULL, x, args);
444 x = build_fold_addr_expr (h->to);
445 args = tree_cons (NULL, x, args);
447 x = built_in_decls[BUILT_IN_EMUTLS_REGISTER_COMMON];
448 x = build_function_call_expr (UNKNOWN_LOCATION, x, args);
450 append_to_statement_list (x, pstmts);
457 if (targetm.emutls.register_common)
459 tree body = NULL_TREE;
461 if (emutls_htab == NULL)
464 htab_traverse_noresize (emutls_htab, emutls_common_1, &body);
465 if (body == NULL_TREE)
468 cgraph_build_static_cdtor ('I', body, DEFAULT_INIT_PRIORITY);
472 /* Helper routines for maintaining section_htab. */
475 section_entry_eq (const void *p1, const void *p2)
477 const section *old = (const section *) p1;
478 const char *new_name = (const char *) p2;
480 return strcmp (old->named.name, new_name) == 0;
484 section_entry_hash (const void *p)
486 const section *old = (const section *) p;
487 return htab_hash_string (old->named.name);
490 /* Return a hash value for section SECT. */
493 hash_section (section *sect)
495 if (sect->common.flags & SECTION_NAMED)
496 return htab_hash_string (sect->named.name);
497 return sect->common.flags;
500 /* Helper routines for maintaining object_block_htab. */
503 object_block_entry_eq (const void *p1, const void *p2)
505 const struct object_block *old = (const struct object_block *) p1;
506 const section *new_section = (const section *) p2;
508 return old->sect == new_section;
512 object_block_entry_hash (const void *p)
514 const struct object_block *old = (const struct object_block *) p;
515 return hash_section (old->sect);
518 /* Return a new unnamed section with the given fields. */
521 get_unnamed_section (unsigned int flags, void (*callback) (const void *),
526 sect = GGC_NEW (section);
527 sect->unnamed.common.flags = flags | SECTION_UNNAMED;
528 sect->unnamed.callback = callback;
529 sect->unnamed.data = data;
530 sect->unnamed.next = unnamed_sections;
532 unnamed_sections = sect;
536 /* Return a SECTION_NOSWITCH section with the given fields. */
539 get_noswitch_section (unsigned int flags, noswitch_section_callback callback)
543 sect = GGC_NEW (section);
544 sect->noswitch.common.flags = flags | SECTION_NOSWITCH;
545 sect->noswitch.callback = callback;
550 /* Return the named section structure associated with NAME. Create
551 a new section with the given fields if no such structure exists. */
554 get_section (const char *name, unsigned int flags, tree decl)
556 section *sect, **slot;
559 htab_find_slot_with_hash (section_htab, name,
560 htab_hash_string (name), INSERT);
561 flags |= SECTION_NAMED;
564 sect = GGC_NEW (section);
565 sect->named.common.flags = flags;
566 sect->named.name = ggc_strdup (name);
567 sect->named.decl = decl;
573 if ((sect->common.flags & ~SECTION_DECLARED) != flags
574 && ((sect->common.flags | flags) & SECTION_OVERRIDE) == 0)
576 /* Sanity check user variables for flag changes. */
578 decl = sect->named.decl;
580 error ("%+D causes a section type conflict", decl);
586 /* Return true if the current compilation mode benefits from having
587 objects grouped into blocks. */
590 use_object_blocks_p (void)
592 return flag_section_anchors;
595 /* Return the object_block structure for section SECT. Create a new
596 structure if we haven't created one already. Return null if SECT
599 static struct object_block *
600 get_block_for_section (section *sect)
602 struct object_block *block;
608 slot = htab_find_slot_with_hash (object_block_htab, sect,
609 hash_section (sect), INSERT);
610 block = (struct object_block *) *slot;
613 block = (struct object_block *)
614 ggc_alloc_cleared (sizeof (struct object_block));
621 /* Create a symbol with label LABEL and place it at byte offset
622 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
623 is not yet known. LABEL must be a garbage-collected string. */
626 create_block_symbol (const char *label, struct object_block *block,
627 HOST_WIDE_INT offset)
632 /* Create the extended SYMBOL_REF. */
633 size = RTX_HDR_SIZE + sizeof (struct block_symbol);
634 symbol = (rtx) ggc_alloc_zone (size, &rtl_zone);
636 /* Initialize the normal SYMBOL_REF fields. */
637 memset (symbol, 0, size);
638 PUT_CODE (symbol, SYMBOL_REF);
639 PUT_MODE (symbol, Pmode);
640 XSTR (symbol, 0) = label;
641 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_HAS_BLOCK_INFO;
643 /* Initialize the block_symbol stuff. */
644 SYMBOL_REF_BLOCK (symbol) = block;
645 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
651 initialize_cold_section_name (void)
653 const char *stripped_name;
657 gcc_assert (cfun && current_function_decl);
658 if (crtl->subsections.unlikely_text_section_name)
661 dsn = DECL_SECTION_NAME (current_function_decl);
662 if (flag_function_sections && dsn)
664 name = (char *) alloca (TREE_STRING_LENGTH (dsn) + 1);
665 memcpy (name, TREE_STRING_POINTER (dsn), TREE_STRING_LENGTH (dsn) + 1);
667 stripped_name = targetm.strip_name_encoding (name);
669 buffer = ACONCAT ((stripped_name, "_unlikely", NULL));
670 crtl->subsections.unlikely_text_section_name = ggc_strdup (buffer);
673 crtl->subsections.unlikely_text_section_name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
676 /* Tell assembler to switch to unlikely-to-be-executed text section. */
679 unlikely_text_section (void)
683 if (!crtl->subsections.unlikely_text_section_name)
684 initialize_cold_section_name ();
686 return get_named_section (NULL, crtl->subsections.unlikely_text_section_name, 0);
689 return get_named_section (NULL, UNLIKELY_EXECUTED_TEXT_SECTION_NAME, 0);
692 /* When called within a function context, return true if the function
693 has been assigned a cold text section and if SECT is that section.
694 When called outside a function context, return true if SECT is the
695 default cold section. */
698 unlikely_text_section_p (section *sect)
703 name = crtl->subsections.unlikely_text_section_name;
705 name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
709 && SECTION_STYLE (sect) == SECTION_NAMED
710 && strcmp (name, sect->named.name) == 0);
713 /* Return a section with a particular name and with whatever SECTION_*
714 flags section_type_flags deems appropriate. The name of the section
715 is taken from NAME if nonnull, otherwise it is taken from DECL's
716 DECL_SECTION_NAME. DECL is the decl associated with the section
717 (see the section comment for details) and RELOC is as for
718 section_type_flags. */
721 get_named_section (tree decl, const char *name, int reloc)
725 gcc_assert (!decl || DECL_P (decl));
727 name = TREE_STRING_POINTER (DECL_SECTION_NAME (decl));
729 flags = targetm.section_type_flags (decl, name, reloc);
731 return get_section (name, flags, decl);
734 /* If required, set DECL_SECTION_NAME to a unique name. */
737 resolve_unique_section (tree decl, int reloc ATTRIBUTE_UNUSED,
738 int flag_function_or_data_sections)
740 if (DECL_SECTION_NAME (decl) == NULL_TREE
741 && targetm.have_named_sections
742 && (flag_function_or_data_sections
743 || DECL_ONE_ONLY (decl)))
744 targetm.asm_out.unique_section (decl, reloc);
747 #ifdef BSS_SECTION_ASM_OP
749 #ifdef ASM_OUTPUT_BSS
751 /* Utility function for ASM_OUTPUT_BSS for targets to use if
752 they don't support alignments in .bss.
753 ??? It is believed that this function will work in most cases so such
754 support is localized here. */
757 asm_output_bss (FILE *file, tree decl ATTRIBUTE_UNUSED,
759 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
760 unsigned HOST_WIDE_INT rounded)
762 gcc_assert (strcmp (XSTR (XEXP (DECL_RTL (decl), 0), 0), name) == 0);
763 targetm.asm_out.globalize_decl_name (file, decl);
764 switch_to_section (bss_section);
765 #ifdef ASM_DECLARE_OBJECT_NAME
766 last_assemble_variable_decl = decl;
767 ASM_DECLARE_OBJECT_NAME (file, name, decl);
769 /* Standard thing is just output label for the object. */
770 ASM_OUTPUT_LABEL (file, name);
771 #endif /* ASM_DECLARE_OBJECT_NAME */
772 ASM_OUTPUT_SKIP (file, rounded ? rounded : 1);
777 #ifdef ASM_OUTPUT_ALIGNED_BSS
779 /* Utility function for targets to use in implementing
780 ASM_OUTPUT_ALIGNED_BSS.
781 ??? It is believed that this function will work in most cases so such
782 support is localized here. */
785 asm_output_aligned_bss (FILE *file, tree decl ATTRIBUTE_UNUSED,
786 const char *name, unsigned HOST_WIDE_INT size,
789 switch_to_section (bss_section);
790 ASM_OUTPUT_ALIGN (file, floor_log2 (align / BITS_PER_UNIT));
791 #ifdef ASM_DECLARE_OBJECT_NAME
792 last_assemble_variable_decl = decl;
793 ASM_DECLARE_OBJECT_NAME (file, name, decl);
795 /* Standard thing is just output label for the object. */
796 ASM_OUTPUT_LABEL (file, name);
797 #endif /* ASM_DECLARE_OBJECT_NAME */
798 ASM_OUTPUT_SKIP (file, size ? size : 1);
803 #endif /* BSS_SECTION_ASM_OP */
805 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
806 /* Return the hot section for function DECL. Return text_section for
810 hot_function_section (tree decl)
812 if (decl != NULL_TREE
813 && DECL_SECTION_NAME (decl) != NULL_TREE
814 && targetm.have_named_sections)
815 return get_named_section (decl, NULL, 0);
821 /* Return the section for function DECL.
823 If DECL is NULL_TREE, return the text section. We can be passed
824 NULL_TREE under some circumstances by dbxout.c at least. */
827 function_section (tree decl)
831 if (first_function_block_is_cold)
834 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
835 if (decl != NULL_TREE
836 && DECL_SECTION_NAME (decl) != NULL_TREE)
837 return reloc ? unlikely_text_section ()
838 : get_named_section (decl, NULL, 0);
840 return targetm.asm_out.select_section (decl, reloc, DECL_ALIGN (decl));
842 return reloc ? unlikely_text_section () : hot_function_section (decl);
847 current_function_section (void)
849 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
850 if (current_function_decl != NULL_TREE
851 && DECL_SECTION_NAME (current_function_decl) != NULL_TREE)
852 return in_cold_section_p ? unlikely_text_section ()
853 : get_named_section (current_function_decl,
856 return targetm.asm_out.select_section (current_function_decl,
858 DECL_ALIGN (current_function_decl));
860 return (in_cold_section_p
861 ? unlikely_text_section ()
862 : hot_function_section (current_function_decl));
866 /* Return the read-only data section associated with function DECL. */
869 default_function_rodata_section (tree decl)
871 if (decl != NULL_TREE && DECL_SECTION_NAME (decl))
873 const char *name = TREE_STRING_POINTER (DECL_SECTION_NAME (decl));
875 if (DECL_ONE_ONLY (decl) && HAVE_COMDAT_GROUP)
881 dot = strchr (name + 1, '.');
884 len = strlen (dot) + 8;
885 rname = (char *) alloca (len);
887 strcpy (rname, ".rodata");
889 return get_section (rname, SECTION_LINKONCE, decl);
891 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
892 else if (DECL_ONE_ONLY (decl)
893 && strncmp (name, ".gnu.linkonce.t.", 16) == 0)
895 size_t len = strlen (name) + 1;
896 char *rname = (char *) alloca (len);
898 memcpy (rname, name, len);
900 return get_section (rname, SECTION_LINKONCE, decl);
902 /* For .text.foo we want to use .rodata.foo. */
903 else if (flag_function_sections && flag_data_sections
904 && strncmp (name, ".text.", 6) == 0)
906 size_t len = strlen (name) + 1;
907 char *rname = (char *) alloca (len + 2);
909 memcpy (rname, ".rodata", 7);
910 memcpy (rname + 7, name + 5, len - 5);
911 return get_section (rname, 0, decl);
915 return readonly_data_section;
918 /* Return the read-only data section associated with function DECL
919 for targets where that section should be always the single
920 readonly data section. */
923 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED)
925 return readonly_data_section;
928 /* Return the section to use for string merging. */
931 mergeable_string_section (tree decl ATTRIBUTE_UNUSED,
932 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
933 unsigned int flags ATTRIBUTE_UNUSED)
937 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
938 && TREE_CODE (decl) == STRING_CST
939 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
941 && (len = int_size_in_bytes (TREE_TYPE (decl))) > 0
942 && TREE_STRING_LENGTH (decl) >= len)
944 enum machine_mode mode;
945 unsigned int modesize;
951 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (decl)));
952 modesize = GET_MODE_BITSIZE (mode);
953 if (modesize >= 8 && modesize <= 256
954 && (modesize & (modesize - 1)) == 0)
956 if (align < modesize)
959 str = TREE_STRING_POINTER (decl);
960 unit = GET_MODE_SIZE (mode);
962 /* Check for embedded NUL characters. */
963 for (i = 0; i < len; i += unit)
965 for (j = 0; j < unit; j++)
966 if (str[i + j] != '\0')
973 sprintf (name, ".rodata.str%d.%d", modesize / 8,
975 flags |= (modesize / 8) | SECTION_MERGE | SECTION_STRINGS;
976 return get_section (name, flags, NULL);
981 return readonly_data_section;
984 /* Return the section to use for constant merging. */
987 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED,
988 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
989 unsigned int flags ATTRIBUTE_UNUSED)
991 unsigned int modesize = GET_MODE_BITSIZE (mode);
993 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
999 && (align & (align - 1)) == 0)
1003 sprintf (name, ".rodata.cst%d", (int) (align / 8));
1004 flags |= (align / 8) | SECTION_MERGE;
1005 return get_section (name, flags, NULL);
1007 return readonly_data_section;
1010 /* Given NAME, a putative register name, discard any customary prefixes. */
1013 strip_reg_name (const char *name)
1015 #ifdef REGISTER_PREFIX
1016 if (!strncmp (name, REGISTER_PREFIX, strlen (REGISTER_PREFIX)))
1017 name += strlen (REGISTER_PREFIX);
1019 if (name[0] == '%' || name[0] == '#')
1024 /* The user has asked for a DECL to have a particular name. Set (or
1025 change) it in such a way that we don't prefix an underscore to
1028 set_user_assembler_name (tree decl, const char *name)
1030 char *starred = (char *) alloca (strlen (name) + 2);
1032 strcpy (starred + 1, name);
1033 change_decl_assembler_name (decl, get_identifier (starred));
1034 SET_DECL_RTL (decl, NULL_RTX);
1037 /* Decode an `asm' spec for a declaration as a register name.
1038 Return the register number, or -1 if nothing specified,
1039 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
1040 or -3 if ASMSPEC is `cc' and is not recognized,
1041 or -4 if ASMSPEC is `memory' and is not recognized.
1042 Accept an exact spelling or a decimal number.
1043 Prefixes such as % are optional. */
1046 decode_reg_name (const char *asmspec)
1052 /* Get rid of confusing prefixes. */
1053 asmspec = strip_reg_name (asmspec);
1055 /* Allow a decimal number as a "register name". */
1056 for (i = strlen (asmspec) - 1; i >= 0; i--)
1057 if (! ISDIGIT (asmspec[i]))
1059 if (asmspec[0] != 0 && i < 0)
1062 if (i < FIRST_PSEUDO_REGISTER && i >= 0)
1068 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
1070 && ! strcmp (asmspec, strip_reg_name (reg_names[i])))
1073 #ifdef ADDITIONAL_REGISTER_NAMES
1075 static const struct { const char *const name; const int number; } table[]
1076 = ADDITIONAL_REGISTER_NAMES;
1078 for (i = 0; i < (int) ARRAY_SIZE (table); i++)
1079 if (table[i].name[0]
1080 && ! strcmp (asmspec, table[i].name))
1081 return table[i].number;
1083 #endif /* ADDITIONAL_REGISTER_NAMES */
1085 if (!strcmp (asmspec, "memory"))
1088 if (!strcmp (asmspec, "cc"))
1097 /* Return true if DECL's initializer is suitable for a BSS section. */
1100 bss_initializer_p (const_tree decl)
1102 return (DECL_INITIAL (decl) == NULL
1103 || DECL_INITIAL (decl) == error_mark_node
1104 || (flag_zero_initialized_in_bss
1105 /* Leave constant zeroes in .rodata so they
1107 && !TREE_READONLY (decl)
1108 && initializer_zerop (DECL_INITIAL (decl))));
1111 /* Compute the alignment of variable specified by DECL.
1112 DONT_OUTPUT_DATA is from assemble_variable. */
1115 align_variable (tree decl, bool dont_output_data)
1117 unsigned int align = DECL_ALIGN (decl);
1119 /* In the case for initialing an array whose length isn't specified,
1120 where we have not yet been able to do the layout,
1121 figure out the proper alignment now. */
1122 if (dont_output_data && DECL_SIZE (decl) == 0
1123 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
1124 align = MAX (align, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl))));
1126 /* Some object file formats have a maximum alignment which they support.
1127 In particular, a.out format supports a maximum alignment of 4. */
1128 if (align > MAX_OFILE_ALIGNMENT)
1130 warning (0, "alignment of %q+D is greater than maximum object "
1131 "file alignment. Using %d", decl,
1132 MAX_OFILE_ALIGNMENT/BITS_PER_UNIT);
1133 align = MAX_OFILE_ALIGNMENT;
1136 /* On some machines, it is good to increase alignment sometimes. */
1137 if (! DECL_USER_ALIGN (decl))
1139 #ifdef DATA_ALIGNMENT
1140 unsigned int data_align = DATA_ALIGNMENT (TREE_TYPE (decl), align);
1141 /* Don't increase alignment too much for TLS variables - TLS space
1143 if (! DECL_THREAD_LOCAL_P (decl) || data_align <= BITS_PER_WORD)
1146 #ifdef CONSTANT_ALIGNMENT
1147 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
1149 unsigned int const_align = CONSTANT_ALIGNMENT (DECL_INITIAL (decl),
1151 /* Don't increase alignment too much for TLS variables - TLS space
1153 if (! DECL_THREAD_LOCAL_P (decl) || const_align <= BITS_PER_WORD)
1154 align = const_align;
1159 /* Reset the alignment in case we have made it tighter, so we can benefit
1160 from it in get_pointer_alignment. */
1161 DECL_ALIGN (decl) = align;
1164 /* Return the section into which the given VAR_DECL or CONST_DECL
1165 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1166 section should be used wherever possible. */
1169 get_variable_section (tree decl, bool prefer_noswitch_p)
1171 addr_space_t as = ADDR_SPACE_GENERIC;
1174 if (TREE_TYPE (decl) != error_mark_node)
1175 as = TYPE_ADDR_SPACE (TREE_TYPE (decl));
1177 if (DECL_COMMON (decl))
1179 /* If the decl has been given an explicit section name, or it resides
1180 in a non-generic address space, then it isn't common, and shouldn't
1181 be handled as such. */
1182 gcc_assert (DECL_SECTION_NAME (decl) == NULL
1183 && ADDR_SPACE_GENERIC_P (as));
1184 if (DECL_THREAD_LOCAL_P (decl))
1185 return tls_comm_section;
1186 /* This cannot be common bss for an emulated TLS object without
1187 a register_common hook. */
1188 else if (DECL_TLS_MODEL (decl) == TLS_MODEL_EMULATED
1189 && !targetm.emutls.register_common)
1191 else if (TREE_PUBLIC (decl) && bss_initializer_p (decl))
1192 return comm_section;
1195 if (DECL_INITIAL (decl) == error_mark_node)
1196 reloc = contains_pointers_p (TREE_TYPE (decl)) ? 3 : 0;
1197 else if (DECL_INITIAL (decl))
1198 reloc = compute_reloc_for_constant (DECL_INITIAL (decl));
1202 resolve_unique_section (decl, reloc, flag_data_sections);
1203 if (IN_NAMED_SECTION (decl))
1204 return get_named_section (decl, NULL, reloc);
1206 if (ADDR_SPACE_GENERIC_P (as)
1207 && !DECL_THREAD_LOCAL_P (decl)
1208 && !(prefer_noswitch_p && targetm.have_switchable_bss_sections)
1209 && bss_initializer_p (decl))
1211 if (!TREE_PUBLIC (decl))
1212 return lcomm_section;
1213 if (bss_noswitch_section)
1214 return bss_noswitch_section;
1217 return targetm.asm_out.select_section (decl, reloc, DECL_ALIGN (decl));
1220 /* Return the block into which object_block DECL should be placed. */
1222 static struct object_block *
1223 get_block_for_decl (tree decl)
1227 if (TREE_CODE (decl) == VAR_DECL)
1229 /* The object must be defined in this translation unit. */
1230 if (DECL_EXTERNAL (decl))
1233 /* There's no point using object blocks for something that is
1234 isolated by definition. */
1235 if (DECL_ONE_ONLY (decl))
1239 /* We can only calculate block offsets if the decl has a known
1241 if (DECL_SIZE_UNIT (decl) == NULL)
1243 if (!host_integerp (DECL_SIZE_UNIT (decl), 1))
1246 /* Find out which section should contain DECL. We cannot put it into
1247 an object block if it requires a standalone definition. */
1248 if (TREE_CODE (decl) == VAR_DECL)
1249 align_variable (decl, 0);
1250 sect = get_variable_section (decl, true);
1251 if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
1254 return get_block_for_section (sect);
1257 /* Make sure block symbol SYMBOL is in block BLOCK. */
1260 change_symbol_block (rtx symbol, struct object_block *block)
1262 if (block != SYMBOL_REF_BLOCK (symbol))
1264 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol) < 0);
1265 SYMBOL_REF_BLOCK (symbol) = block;
1269 /* Return true if it is possible to put DECL in an object_block. */
1272 use_blocks_for_decl_p (tree decl)
1274 /* Only data DECLs can be placed into object blocks. */
1275 if (TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != CONST_DECL)
1278 /* Detect decls created by dw2_force_const_mem. Such decls are
1279 special because DECL_INITIAL doesn't specify the decl's true value.
1280 dw2_output_indirect_constants will instead call assemble_variable
1281 with dont_output_data set to 1 and then print the contents itself. */
1282 if (DECL_INITIAL (decl) == decl)
1285 /* If this decl is an alias, then we don't want to emit a definition. */
1286 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl)))
1292 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1293 have static storage duration. In other words, it should not be an
1294 automatic variable, including PARM_DECLs.
1296 There is, however, one exception: this function handles variables
1297 explicitly placed in a particular register by the user.
1299 This is never called for PARM_DECL nodes. */
1302 make_decl_rtl (tree decl)
1304 const char *name = 0;
1308 /* Check that we are not being given an automatic variable. */
1309 gcc_assert (TREE_CODE (decl) != PARM_DECL
1310 && TREE_CODE (decl) != RESULT_DECL);
1312 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1313 gcc_assert (TREE_CODE (decl) != VAR_DECL
1314 || TREE_STATIC (decl)
1315 || TREE_PUBLIC (decl)
1316 || DECL_EXTERNAL (decl)
1317 || DECL_REGISTER (decl));
1319 /* And that we were not given a type or a label. */
1320 gcc_assert (TREE_CODE (decl) != TYPE_DECL
1321 && TREE_CODE (decl) != LABEL_DECL);
1323 /* For a duplicate declaration, we can be called twice on the
1324 same DECL node. Don't discard the RTL already made. */
1325 if (DECL_RTL_SET_P (decl))
1327 /* If the old RTL had the wrong mode, fix the mode. */
1328 x = DECL_RTL (decl);
1329 if (GET_MODE (x) != DECL_MODE (decl))
1330 SET_DECL_RTL (decl, adjust_address_nv (x, DECL_MODE (decl), 0));
1332 if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1335 /* ??? Another way to do this would be to maintain a hashed
1336 table of such critters. Instead of adding stuff to a DECL
1337 to give certain attributes to it, we could use an external
1338 hash map from DECL to set of attributes. */
1340 /* Let the target reassign the RTL if it wants.
1341 This is necessary, for example, when one machine specific
1342 decl attribute overrides another. */
1343 targetm.encode_section_info (decl, DECL_RTL (decl), false);
1345 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1346 on the new decl information. */
1348 && GET_CODE (XEXP (x, 0)) == SYMBOL_REF
1349 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x, 0)))
1350 change_symbol_block (XEXP (x, 0), get_block_for_decl (decl));
1352 /* Make this function static known to the mudflap runtime. */
1353 if (flag_mudflap && TREE_CODE (decl) == VAR_DECL)
1354 mudflap_enqueue_decl (decl);
1359 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
1361 if (name[0] != '*' && TREE_CODE (decl) != FUNCTION_DECL
1362 && DECL_REGISTER (decl))
1364 error ("register name not specified for %q+D", decl);
1366 else if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1368 const char *asmspec = name+1;
1369 reg_number = decode_reg_name (asmspec);
1370 /* First detect errors in declaring global registers. */
1371 if (reg_number == -1)
1372 error ("register name not specified for %q+D", decl);
1373 else if (reg_number < 0)
1374 error ("invalid register name for %q+D", decl);
1375 else if (TYPE_MODE (TREE_TYPE (decl)) == BLKmode)
1376 error ("data type of %q+D isn%'t suitable for a register",
1378 else if (! HARD_REGNO_MODE_OK (reg_number, TYPE_MODE (TREE_TYPE (decl))))
1379 error ("register specified for %q+D isn%'t suitable for data type",
1381 /* Now handle properly declared static register variables. */
1386 if (DECL_INITIAL (decl) != 0 && TREE_STATIC (decl))
1388 DECL_INITIAL (decl) = 0;
1389 error ("global register variable has initial value");
1391 if (TREE_THIS_VOLATILE (decl))
1392 warning (OPT_Wvolatile_register_var,
1393 "optimization may eliminate reads and/or "
1394 "writes to register variables");
1396 /* If the user specified one of the eliminables registers here,
1397 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1398 confused with that register and be eliminated. This usage is
1399 somewhat suspect... */
1401 SET_DECL_RTL (decl, gen_rtx_raw_REG (DECL_MODE (decl), reg_number));
1402 ORIGINAL_REGNO (DECL_RTL (decl)) = reg_number;
1403 REG_USERVAR_P (DECL_RTL (decl)) = 1;
1405 if (TREE_STATIC (decl))
1407 /* Make this register global, so not usable for anything
1409 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1410 name = IDENTIFIER_POINTER (DECL_NAME (decl));
1411 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file, decl, reg_number, name);
1413 nregs = hard_regno_nregs[reg_number][DECL_MODE (decl)];
1415 globalize_reg (reg_number + --nregs);
1418 /* As a register variable, it has no section. */
1422 /* Now handle ordinary static variables and functions (in memory).
1423 Also handle vars declared register invalidly. */
1424 else if (name[0] == '*')
1426 #ifdef REGISTER_PREFIX
1427 if (strlen (REGISTER_PREFIX) != 0)
1429 reg_number = decode_reg_name (name);
1430 if (reg_number >= 0 || reg_number == -3)
1431 error ("register name given for non-register variable %q+D", decl);
1436 /* Specifying a section attribute on a variable forces it into a
1437 non-.bss section, and thus it cannot be common. */
1438 gcc_assert (!(TREE_CODE (decl) == VAR_DECL
1439 && DECL_SECTION_NAME (decl) != NULL_TREE
1440 && DECL_INITIAL (decl) == NULL_TREE
1441 && DECL_COMMON (decl))
1442 || !DECL_COMMON (decl));
1444 /* Variables can't be both common and weak. */
1445 gcc_assert (TREE_CODE (decl) != VAR_DECL
1446 || !DECL_WEAK (decl)
1447 || !DECL_COMMON (decl));
1449 if (use_object_blocks_p () && use_blocks_for_decl_p (decl))
1450 x = create_block_symbol (name, get_block_for_decl (decl), -1);
1453 enum machine_mode address_mode = Pmode;
1454 if (TREE_TYPE (decl) != error_mark_node)
1456 addr_space_t as = TYPE_ADDR_SPACE (TREE_TYPE (decl));
1457 address_mode = targetm.addr_space.address_mode (as);
1459 x = gen_rtx_SYMBOL_REF (address_mode, name);
1461 SYMBOL_REF_WEAK (x) = DECL_WEAK (decl);
1462 SET_SYMBOL_REF_DECL (x, decl);
1464 x = gen_rtx_MEM (DECL_MODE (decl), x);
1465 if (TREE_CODE (decl) != FUNCTION_DECL)
1466 set_mem_attributes (x, decl, 1);
1467 SET_DECL_RTL (decl, x);
1469 /* Optionally set flags or add text to the name to record information
1470 such as that it is a function name.
1471 If the name is changed, the macro ASM_OUTPUT_LABELREF
1472 will have to know how to strip this information. */
1473 targetm.encode_section_info (decl, DECL_RTL (decl), true);
1475 /* Make this function static known to the mudflap runtime. */
1476 if (flag_mudflap && TREE_CODE (decl) == VAR_DECL)
1477 mudflap_enqueue_decl (decl);
1480 /* Output a string of literal assembler code
1481 for an `asm' keyword used between functions. */
1484 assemble_asm (tree string)
1488 if (TREE_CODE (string) == ADDR_EXPR)
1489 string = TREE_OPERAND (string, 0);
1491 fprintf (asm_out_file, "\t%s\n", TREE_STRING_POINTER (string));
1494 /* Record an element in the table of global destructors. SYMBOL is
1495 a SYMBOL_REF of the function to be called; PRIORITY is a number
1496 between 0 and MAX_INIT_PRIORITY. */
1499 default_stabs_asm_out_destructor (rtx symbol ATTRIBUTE_UNUSED,
1500 int priority ATTRIBUTE_UNUSED)
1502 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1503 /* Tell GNU LD that this is part of the static destructor set.
1504 This will work for any system that uses stabs, most usefully
1506 dbxout_begin_simple_stabs ("___DTOR_LIST__", 22 /* N_SETT */);
1507 dbxout_stab_value_label (XSTR (symbol, 0));
1509 sorry ("global destructors not supported on this target");
1513 /* Write the address of the entity given by SYMBOL to SEC. */
1515 assemble_addr_to_section (rtx symbol, section *sec)
1517 switch_to_section (sec);
1518 assemble_align (POINTER_SIZE);
1519 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1522 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1523 not) section for PRIORITY. */
1525 get_cdtor_priority_section (int priority, bool constructor_p)
1529 /* ??? This only works reliably with the GNU linker. */
1530 sprintf (buf, "%s.%.5u",
1531 constructor_p ? ".ctors" : ".dtors",
1532 /* Invert the numbering so the linker puts us in the proper
1533 order; constructors are run from right to left, and the
1534 linker sorts in increasing order. */
1535 MAX_INIT_PRIORITY - priority);
1536 return get_section (buf, SECTION_WRITE, NULL);
1540 default_named_section_asm_out_destructor (rtx symbol, int priority)
1544 if (priority != DEFAULT_INIT_PRIORITY)
1545 sec = get_cdtor_priority_section (priority,
1546 /*constructor_p=*/false);
1548 sec = get_section (".dtors", SECTION_WRITE, NULL);
1550 assemble_addr_to_section (symbol, sec);
1553 #ifdef DTORS_SECTION_ASM_OP
1555 default_dtor_section_asm_out_destructor (rtx symbol,
1556 int priority ATTRIBUTE_UNUSED)
1558 assemble_addr_to_section (symbol, dtors_section);
1562 /* Likewise for global constructors. */
1565 default_stabs_asm_out_constructor (rtx symbol ATTRIBUTE_UNUSED,
1566 int priority ATTRIBUTE_UNUSED)
1568 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1569 /* Tell GNU LD that this is part of the static destructor set.
1570 This will work for any system that uses stabs, most usefully
1572 dbxout_begin_simple_stabs ("___CTOR_LIST__", 22 /* N_SETT */);
1573 dbxout_stab_value_label (XSTR (symbol, 0));
1575 sorry ("global constructors not supported on this target");
1580 default_named_section_asm_out_constructor (rtx symbol, int priority)
1584 if (priority != DEFAULT_INIT_PRIORITY)
1585 sec = get_cdtor_priority_section (priority,
1586 /*constructor_p=*/true);
1588 sec = get_section (".ctors", SECTION_WRITE, NULL);
1590 assemble_addr_to_section (symbol, sec);
1593 #ifdef CTORS_SECTION_ASM_OP
1595 default_ctor_section_asm_out_constructor (rtx symbol,
1596 int priority ATTRIBUTE_UNUSED)
1598 assemble_addr_to_section (symbol, ctors_section);
1602 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1603 a nonzero value if the constant pool should be output before the
1604 start of the function, or a zero value if the pool should output
1605 after the end of the function. The default is to put it before the
1608 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1609 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1612 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1613 to be output to assembler.
1614 Set first_global_object_name and weak_global_object_name as appropriate. */
1617 notice_global_symbol (tree decl)
1619 const char **type = &first_global_object_name;
1621 if (first_global_object_name
1622 || !TREE_PUBLIC (decl)
1623 || DECL_EXTERNAL (decl)
1624 || !DECL_NAME (decl)
1625 || (TREE_CODE (decl) != FUNCTION_DECL
1626 && (TREE_CODE (decl) != VAR_DECL
1627 || (DECL_COMMON (decl)
1628 && (DECL_INITIAL (decl) == 0
1629 || DECL_INITIAL (decl) == error_mark_node))))
1630 || !MEM_P (DECL_RTL (decl)))
1633 /* We win when global object is found, but it is useful to know about weak
1634 symbol as well so we can produce nicer unique names. */
1635 if (DECL_WEAK (decl) || DECL_ONE_ONLY (decl) || flag_shlib)
1636 type = &weak_global_object_name;
1642 rtx decl_rtl = DECL_RTL (decl);
1644 p = targetm.strip_name_encoding (XSTR (XEXP (decl_rtl, 0), 0));
1645 name = ggc_strdup (p);
1651 /* Output assembler code for the constant pool of a function and associated
1652 with defining the name of the function. DECL describes the function.
1653 NAME is the function's name. For the constant pool, we use the current
1654 constant pool data. */
1657 assemble_start_function (tree decl, const char *fnname)
1660 char tmp_label[100];
1661 bool hot_label_written = false;
1663 crtl->subsections.unlikely_text_section_name = NULL;
1665 first_function_block_is_cold = false;
1666 if (flag_reorder_blocks_and_partition)
1668 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTB", const_labelno);
1669 crtl->subsections.hot_section_label = ggc_strdup (tmp_label);
1670 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDB", const_labelno);
1671 crtl->subsections.cold_section_label = ggc_strdup (tmp_label);
1672 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTE", const_labelno);
1673 crtl->subsections.hot_section_end_label = ggc_strdup (tmp_label);
1674 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDE", const_labelno);
1675 crtl->subsections.cold_section_end_label = ggc_strdup (tmp_label);
1680 crtl->subsections.hot_section_label = NULL;
1681 crtl->subsections.cold_section_label = NULL;
1682 crtl->subsections.hot_section_end_label = NULL;
1683 crtl->subsections.cold_section_end_label = NULL;
1686 /* The following code does not need preprocessing in the assembler. */
1690 if (CONSTANT_POOL_BEFORE_FUNCTION)
1691 output_constant_pool (fnname, decl);
1693 resolve_unique_section (decl, 0, flag_function_sections);
1695 /* Make sure the not and cold text (code) sections are properly
1696 aligned. This is necessary here in the case where the function
1697 has both hot and cold sections, because we don't want to re-set
1698 the alignment when the section switch happens mid-function. */
1700 if (flag_reorder_blocks_and_partition)
1702 switch_to_section (unlikely_text_section ());
1703 assemble_align (DECL_ALIGN (decl));
1704 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.cold_section_label);
1706 /* When the function starts with a cold section, we need to explicitly
1707 align the hot section and write out the hot section label.
1708 But if the current function is a thunk, we do not have a CFG. */
1710 && BB_PARTITION (ENTRY_BLOCK_PTR->next_bb) == BB_COLD_PARTITION)
1712 switch_to_section (text_section);
1713 assemble_align (DECL_ALIGN (decl));
1714 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_label);
1715 hot_label_written = true;
1716 first_function_block_is_cold = true;
1719 else if (DECL_SECTION_NAME (decl))
1721 /* Calls to function_section rely on first_function_block_is_cold
1722 being accurate. The first block may be cold even if we aren't
1723 doing partitioning, if the entire function was decided by
1724 choose_function_section (predict.c) to be cold. */
1726 initialize_cold_section_name ();
1728 if (crtl->subsections.unlikely_text_section_name
1729 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)),
1730 crtl->subsections.unlikely_text_section_name) == 0)
1731 first_function_block_is_cold = true;
1734 in_cold_section_p = first_function_block_is_cold;
1736 /* Switch to the correct text section for the start of the function. */
1738 switch_to_section (function_section (decl));
1739 if (flag_reorder_blocks_and_partition
1740 && !hot_label_written)
1741 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_label);
1743 /* Tell assembler to move to target machine's alignment for functions. */
1744 align = floor_log2 (DECL_ALIGN (decl) / BITS_PER_UNIT);
1747 ASM_OUTPUT_ALIGN (asm_out_file, align);
1750 /* Handle a user-specified function alignment.
1751 Note that we still need to align to DECL_ALIGN, as above,
1752 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1753 if (! DECL_USER_ALIGN (decl)
1754 && align_functions_log > align
1755 && optimize_function_for_speed_p (cfun))
1757 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1758 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file,
1759 align_functions_log, align_functions - 1);
1761 ASM_OUTPUT_ALIGN (asm_out_file, align_functions_log);
1765 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1766 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file, fnname);
1769 if (!DECL_IGNORED_P (decl))
1770 (*debug_hooks->begin_function) (decl);
1772 /* Make function name accessible from other files, if appropriate. */
1774 if (TREE_PUBLIC (decl))
1776 notice_global_symbol (decl);
1778 globalize_decl (decl);
1780 maybe_assemble_visibility (decl);
1783 if (DECL_PRESERVE_P (decl))
1784 targetm.asm_out.mark_decl_preserved (fnname);
1786 /* Do any machine/system dependent processing of the function name. */
1787 #ifdef ASM_DECLARE_FUNCTION_NAME
1788 ASM_DECLARE_FUNCTION_NAME (asm_out_file, fnname, current_function_decl);
1790 /* Standard thing is just output label for the function. */
1791 ASM_OUTPUT_LABEL (asm_out_file, fnname);
1792 #endif /* ASM_DECLARE_FUNCTION_NAME */
1795 /* Output assembler code associated with defining the size of the
1796 function. DECL describes the function. NAME is the function's name. */
1799 assemble_end_function (tree decl, const char *fnname ATTRIBUTE_UNUSED)
1801 #ifdef ASM_DECLARE_FUNCTION_SIZE
1802 /* We could have switched section in the middle of the function. */
1803 if (flag_reorder_blocks_and_partition)
1804 switch_to_section (function_section (decl));
1805 ASM_DECLARE_FUNCTION_SIZE (asm_out_file, fnname, decl);
1807 if (! CONSTANT_POOL_BEFORE_FUNCTION)
1809 output_constant_pool (fnname, decl);
1810 switch_to_section (function_section (decl)); /* need to switch back */
1812 /* Output labels for end of hot/cold text sections (to be used by
1814 if (flag_reorder_blocks_and_partition)
1816 section *save_text_section;
1818 save_text_section = in_section;
1819 switch_to_section (unlikely_text_section ());
1820 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.cold_section_end_label);
1821 if (first_function_block_is_cold)
1822 switch_to_section (text_section);
1824 switch_to_section (function_section (decl));
1825 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_end_label);
1826 switch_to_section (save_text_section);
1830 /* Assemble code to leave SIZE bytes of zeros. */
1833 assemble_zeros (unsigned HOST_WIDE_INT size)
1835 /* Do no output if -fsyntax-only. */
1836 if (flag_syntax_only)
1839 #ifdef ASM_NO_SKIP_IN_TEXT
1840 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1841 so we must output 0s explicitly in the text section. */
1842 if (ASM_NO_SKIP_IN_TEXT && (in_section->common.flags & SECTION_CODE) != 0)
1844 unsigned HOST_WIDE_INT i;
1845 for (i = 0; i < size; i++)
1846 assemble_integer (const0_rtx, 1, BITS_PER_UNIT, 1);
1851 ASM_OUTPUT_SKIP (asm_out_file, size);
1854 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1857 assemble_align (int align)
1859 if (align > BITS_PER_UNIT)
1861 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
1865 /* Assemble a string constant with the specified C string as contents. */
1868 assemble_string (const char *p, int size)
1873 /* If the string is very long, split it up. */
1877 int thissize = size - pos;
1878 if (thissize > maximum)
1881 ASM_OUTPUT_ASCII (asm_out_file, p, thissize);
1889 /* A noswitch_section_callback for lcomm_section. */
1892 emit_local (tree decl ATTRIBUTE_UNUSED,
1893 const char *name ATTRIBUTE_UNUSED,
1894 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1895 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1897 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1898 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, decl, name,
1899 size, DECL_ALIGN (decl));
1901 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1902 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, DECL_ALIGN (decl));
1905 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
1910 /* A noswitch_section_callback for bss_noswitch_section. */
1912 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
1914 emit_bss (tree decl ATTRIBUTE_UNUSED,
1915 const char *name ATTRIBUTE_UNUSED,
1916 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1917 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1919 #if defined ASM_OUTPUT_ALIGNED_BSS
1920 ASM_OUTPUT_ALIGNED_BSS (asm_out_file, decl, name, size, DECL_ALIGN (decl));
1923 ASM_OUTPUT_BSS (asm_out_file, decl, name, size, rounded);
1929 /* A noswitch_section_callback for comm_section. */
1932 emit_common (tree decl ATTRIBUTE_UNUSED,
1933 const char *name ATTRIBUTE_UNUSED,
1934 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1935 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1937 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1938 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, decl, name,
1939 size, DECL_ALIGN (decl));
1941 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1942 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, name, size, DECL_ALIGN (decl));
1945 ASM_OUTPUT_COMMON (asm_out_file, name, size, rounded);
1950 /* A noswitch_section_callback for tls_comm_section. */
1953 emit_tls_common (tree decl ATTRIBUTE_UNUSED,
1954 const char *name ATTRIBUTE_UNUSED,
1955 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1956 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1958 #ifdef ASM_OUTPUT_TLS_COMMON
1959 ASM_OUTPUT_TLS_COMMON (asm_out_file, decl, name, size);
1962 sorry ("thread-local COMMON data not implemented");
1967 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1968 NAME is the name of DECL's SYMBOL_REF. */
1971 assemble_noswitch_variable (tree decl, const char *name, section *sect)
1973 unsigned HOST_WIDE_INT size, rounded;
1975 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
1978 /* Don't allocate zero bytes of common,
1979 since that means "undefined external" in the linker. */
1983 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1984 so that each uninitialized object starts on such a boundary. */
1985 rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1;
1986 rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
1987 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
1989 if (!sect->noswitch.callback (decl, name, size, rounded)
1990 && (unsigned HOST_WIDE_INT) DECL_ALIGN_UNIT (decl) > rounded)
1991 warning (0, "requested alignment for %q+D is greater than "
1992 "implemented alignment of %wu", decl, rounded);
1995 /* A subroutine of assemble_variable. Output the label and contents of
1996 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1997 is as for assemble_variable. */
2000 assemble_variable_contents (tree decl, const char *name,
2001 bool dont_output_data)
2003 /* Do any machine/system dependent processing of the object. */
2004 #ifdef ASM_DECLARE_OBJECT_NAME
2005 last_assemble_variable_decl = decl;
2006 ASM_DECLARE_OBJECT_NAME (asm_out_file, name, decl);
2008 /* Standard thing is just output label for the object. */
2009 ASM_OUTPUT_LABEL (asm_out_file, name);
2010 #endif /* ASM_DECLARE_OBJECT_NAME */
2012 if (!dont_output_data)
2014 if (DECL_INITIAL (decl)
2015 && DECL_INITIAL (decl) != error_mark_node
2016 && !initializer_zerop (DECL_INITIAL (decl)))
2017 /* Output the actual data. */
2018 output_constant (DECL_INITIAL (decl),
2019 tree_low_cst (DECL_SIZE_UNIT (decl), 1),
2022 /* Leave space for it. */
2023 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl), 1));
2027 /* Initialize emulated tls object TO, which refers to TLS variable
2028 DECL and is initialized by PROXY. */
2031 default_emutls_var_init (tree to, tree decl, tree proxy)
2033 VEC(constructor_elt,gc) *v = VEC_alloc (constructor_elt, gc, 4);
2034 constructor_elt *elt;
2035 tree type = TREE_TYPE (to);
2036 tree field = TYPE_FIELDS (type);
2038 elt = VEC_quick_push (constructor_elt, v, NULL);
2040 elt->value = fold_convert (TREE_TYPE (field), DECL_SIZE_UNIT (decl));
2042 elt = VEC_quick_push (constructor_elt, v, NULL);
2043 field = TREE_CHAIN (field);
2045 elt->value = build_int_cst (TREE_TYPE (field),
2046 DECL_ALIGN_UNIT (decl));
2048 elt = VEC_quick_push (constructor_elt, v, NULL);
2049 field = TREE_CHAIN (field);
2051 elt->value = null_pointer_node;
2053 elt = VEC_quick_push (constructor_elt, v, NULL);
2054 field = TREE_CHAIN (field);
2058 return build_constructor (type, v);
2061 /* Assemble everything that is needed for a variable or function declaration.
2062 Not used for automatic variables, and not used for function definitions.
2063 Should not be called for variables of incomplete structure type.
2065 TOP_LEVEL is nonzero if this variable has file scope.
2066 AT_END is nonzero if this is the special handling, at end of compilation,
2067 to define things that have had only tentative definitions.
2068 DONT_OUTPUT_DATA if nonzero means don't actually output the
2069 initial value (that will be done by the caller). */
2072 assemble_variable (tree decl, int top_level ATTRIBUTE_UNUSED,
2073 int at_end ATTRIBUTE_UNUSED, int dont_output_data)
2076 rtx decl_rtl, symbol;
2079 if (! targetm.have_tls
2080 && TREE_CODE (decl) == VAR_DECL
2081 && DECL_THREAD_LOCAL_P (decl))
2083 tree to = emutls_decl (decl);
2085 /* If this variable is defined locally, then we need to initialize the
2086 control structure with size and alignment information. We do this
2087 at the last moment because tentative definitions can take a locally
2088 defined but uninitialized variable and initialize it later, which
2089 would result in incorrect contents. */
2090 if (! DECL_EXTERNAL (to)
2091 && (! DECL_COMMON (to)
2092 || (DECL_INITIAL (decl)
2093 && DECL_INITIAL (decl) != error_mark_node)))
2095 DECL_INITIAL (to) = targetm.emutls.var_init
2096 (to, decl, get_emutls_init_templ_addr (decl));
2098 /* Make sure the template is marked as needed early enough.
2099 Without this, if the variable is placed in a
2100 section-anchored block, the template will only be marked
2101 when it's too late. */
2102 record_references_in_initializer (to, false);
2108 last_assemble_variable_decl = 0;
2110 /* Normally no need to say anything here for external references,
2111 since assemble_external is called by the language-specific code
2112 when a declaration is first seen. */
2114 if (DECL_EXTERNAL (decl))
2117 /* Output no assembler code for a function declaration.
2118 Only definitions of functions output anything. */
2120 if (TREE_CODE (decl) == FUNCTION_DECL)
2123 /* Do nothing for global register variables. */
2124 if (DECL_RTL_SET_P (decl) && REG_P (DECL_RTL (decl)))
2126 TREE_ASM_WRITTEN (decl) = 1;
2130 /* If type was incomplete when the variable was declared,
2131 see if it is complete now. */
2133 if (DECL_SIZE (decl) == 0)
2134 layout_decl (decl, 0);
2136 /* Still incomplete => don't allocate it; treat the tentative defn
2137 (which is what it must have been) as an `extern' reference. */
2139 if (!dont_output_data && DECL_SIZE (decl) == 0)
2141 error ("storage size of %q+D isn%'t known", decl);
2142 TREE_ASM_WRITTEN (decl) = 1;
2146 /* The first declaration of a variable that comes through this function
2147 decides whether it is global (in C, has external linkage)
2148 or local (in C, has internal linkage). So do nothing more
2149 if this function has already run. */
2151 if (TREE_ASM_WRITTEN (decl))
2154 /* Make sure targetm.encode_section_info is invoked before we set
2156 decl_rtl = DECL_RTL (decl);
2158 TREE_ASM_WRITTEN (decl) = 1;
2160 /* Do no output if -fsyntax-only. */
2161 if (flag_syntax_only)
2166 if (! dont_output_data
2167 && ! host_integerp (DECL_SIZE_UNIT (decl), 1))
2169 error ("size of variable %q+D is too large", decl);
2173 gcc_assert (MEM_P (decl_rtl));
2174 gcc_assert (GET_CODE (XEXP (decl_rtl, 0)) == SYMBOL_REF);
2175 symbol = XEXP (decl_rtl, 0);
2176 name = XSTR (symbol, 0);
2177 if (TREE_PUBLIC (decl) && DECL_NAME (decl))
2178 notice_global_symbol (decl);
2180 /* Compute the alignment of this data. */
2182 align_variable (decl, dont_output_data);
2183 set_mem_align (decl_rtl, DECL_ALIGN (decl));
2185 if (TREE_PUBLIC (decl))
2186 maybe_assemble_visibility (decl);
2188 if (DECL_PRESERVE_P (decl))
2189 targetm.asm_out.mark_decl_preserved (name);
2191 /* First make the assembler name(s) global if appropriate. */
2192 sect = get_variable_section (decl, false);
2193 if (TREE_PUBLIC (decl)
2194 && (sect->common.flags & SECTION_COMMON) == 0)
2195 globalize_decl (decl);
2197 /* Output any data that we will need to use the address of. */
2198 if (DECL_INITIAL (decl) && DECL_INITIAL (decl) != error_mark_node)
2199 output_addressed_constants (DECL_INITIAL (decl));
2201 /* dbxout.c needs to know this. */
2202 if (sect && (sect->common.flags & SECTION_CODE) != 0)
2203 DECL_IN_TEXT_SECTION (decl) = 1;
2205 /* If the decl is part of an object_block, make sure that the decl
2206 has been positioned within its block, but do not write out its
2207 definition yet. output_object_blocks will do that later. */
2208 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
2210 gcc_assert (!dont_output_data);
2211 place_block_symbol (symbol);
2213 else if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
2214 assemble_noswitch_variable (decl, name, sect);
2217 switch_to_section (sect);
2218 if (DECL_ALIGN (decl) > BITS_PER_UNIT)
2219 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (DECL_ALIGN_UNIT (decl)));
2220 assemble_variable_contents (decl, name, dont_output_data);
2224 /* Return 1 if type TYPE contains any pointers. */
2227 contains_pointers_p (tree type)
2229 switch (TREE_CODE (type))
2232 case REFERENCE_TYPE:
2233 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2234 so I'll play safe and return 1. */
2240 case QUAL_UNION_TYPE:
2243 /* For a type that has fields, see if the fields have pointers. */
2244 for (fields = TYPE_FIELDS (type); fields; fields = TREE_CHAIN (fields))
2245 if (TREE_CODE (fields) == FIELD_DECL
2246 && contains_pointers_p (TREE_TYPE (fields)))
2252 /* An array type contains pointers if its element type does. */
2253 return contains_pointers_p (TREE_TYPE (type));
2260 /* We delay assemble_external processing until
2261 the compilation unit is finalized. This is the best we can do for
2262 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2263 it all the way to final. See PR 17982 for further discussion. */
2264 static GTY(()) tree pending_assemble_externals;
2266 #ifdef ASM_OUTPUT_EXTERNAL
2267 /* True if DECL is a function decl for which no out-of-line copy exists.
2268 It is assumed that DECL's assembler name has been set. */
2271 incorporeal_function_p (tree decl)
2273 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
2277 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL
2278 && DECL_FUNCTION_CODE (decl) == BUILT_IN_ALLOCA)
2281 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
2282 if (is_builtin_name (name))
2288 /* Actually do the tests to determine if this is necessary, and invoke
2289 ASM_OUTPUT_EXTERNAL. */
2291 assemble_external_real (tree decl)
2293 rtx rtl = DECL_RTL (decl);
2295 if (MEM_P (rtl) && GET_CODE (XEXP (rtl, 0)) == SYMBOL_REF
2296 && !SYMBOL_REF_USED (XEXP (rtl, 0))
2297 && !incorporeal_function_p (decl))
2299 /* Some systems do require some output. */
2300 SYMBOL_REF_USED (XEXP (rtl, 0)) = 1;
2301 ASM_OUTPUT_EXTERNAL (asm_out_file, decl, XSTR (XEXP (rtl, 0), 0));
2307 process_pending_assemble_externals (void)
2309 #ifdef ASM_OUTPUT_EXTERNAL
2311 for (list = pending_assemble_externals; list; list = TREE_CHAIN (list))
2312 assemble_external_real (TREE_VALUE (list));
2314 pending_assemble_externals = 0;
2318 /* This TREE_LIST contains any weak symbol declarations waiting
2320 static GTY(()) tree weak_decls;
2322 /* Output something to declare an external symbol to the assembler,
2323 and qualifiers such as weakness. (Most assemblers don't need
2324 extern declaration, so we normally output nothing.) Do nothing if
2325 DECL is not external. */
2328 assemble_external (tree decl ATTRIBUTE_UNUSED)
2330 /* Because most platforms do not define ASM_OUTPUT_EXTERNAL, the
2331 main body of this code is only rarely exercised. To provide some
2332 testing, on all platforms, we make sure that the ASM_OUT_FILE is
2333 open. If it's not, we should not be calling this function. */
2334 gcc_assert (asm_out_file);
2336 if (!DECL_P (decl) || !DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl))
2339 /* We want to output annotation for weak and external symbols at
2340 very last to check if they are references or not. */
2344 /* TREE_STATIC is a weird and abused creature which is not
2345 generally the right test for whether an entity has been
2346 locally emitted, inlined or otherwise not-really-extern, but
2347 for declarations that can be weak, it happens to be
2349 && !TREE_STATIC (decl)
2350 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl))
2351 && value_member (decl, weak_decls) == NULL_TREE)
2352 weak_decls = tree_cons (NULL, decl, weak_decls);
2354 #ifdef ASM_OUTPUT_EXTERNAL
2355 if (value_member (decl, pending_assemble_externals) == NULL_TREE)
2356 pending_assemble_externals = tree_cons (NULL, decl,
2357 pending_assemble_externals);
2361 /* Similar, for calling a library function FUN. */
2364 assemble_external_libcall (rtx fun)
2366 /* Declare library function name external when first used, if nec. */
2367 if (! SYMBOL_REF_USED (fun))
2369 SYMBOL_REF_USED (fun) = 1;
2370 targetm.asm_out.external_libcall (fun);
2374 /* Assemble a label named NAME. */
2377 assemble_label (const char *name)
2379 ASM_OUTPUT_LABEL (asm_out_file, name);
2382 /* Set the symbol_referenced flag for ID. */
2384 mark_referenced (tree id)
2386 TREE_SYMBOL_REFERENCED (id) = 1;
2389 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2391 mark_decl_referenced (tree decl)
2393 if (TREE_CODE (decl) == FUNCTION_DECL)
2395 /* Extern inline functions don't become needed when referenced.
2396 If we know a method will be emitted in other TU and no new
2397 functions can be marked reachable, just use the external
2399 struct cgraph_node *node = cgraph_node (decl);
2400 if (!DECL_EXTERNAL (decl)
2401 && (!node->local.vtable_method || !cgraph_global_info_ready
2402 || !node->local.finalized))
2403 cgraph_mark_needed_node (node);
2405 else if (TREE_CODE (decl) == VAR_DECL)
2407 struct varpool_node *node = varpool_node (decl);
2408 varpool_mark_needed_node (node);
2409 /* C++ frontend use mark_decl_references to force COMDAT variables
2410 to be output that might appear dead otherwise. */
2411 node->force_output = true;
2413 /* else do nothing - we can get various sorts of CST nodes here,
2414 which do not need to be marked. */
2418 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2419 until we find an identifier that is not itself a transparent alias.
2420 Modify the alias passed to it by reference (and all aliases on the
2421 way to the ultimate target), such that they do not have to be
2422 followed again, and return the ultimate target of the alias
2426 ultimate_transparent_alias_target (tree *alias)
2428 tree target = *alias;
2430 if (IDENTIFIER_TRANSPARENT_ALIAS (target))
2432 gcc_assert (TREE_CHAIN (target));
2433 target = ultimate_transparent_alias_target (&TREE_CHAIN (target));
2434 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target)
2435 && ! TREE_CHAIN (target));
2442 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2443 starts with a *, the rest of NAME is output verbatim. Otherwise
2444 NAME is transformed in a target-specific way (usually by the
2445 addition of an underscore). */
2448 assemble_name_raw (FILE *file, const char *name)
2451 fputs (&name[1], file);
2453 ASM_OUTPUT_LABELREF (file, name);
2456 /* Like assemble_name_raw, but should be used when NAME might refer to
2457 an entity that is also represented as a tree (like a function or
2458 variable). If NAME does refer to such an entity, that entity will
2459 be marked as referenced. */
2462 assemble_name (FILE *file, const char *name)
2464 const char *real_name;
2467 real_name = targetm.strip_name_encoding (name);
2469 id = maybe_get_identifier (real_name);
2474 mark_referenced (id);
2475 ultimate_transparent_alias_target (&id);
2477 name = IDENTIFIER_POINTER (id);
2478 gcc_assert (! TREE_CHAIN (id));
2481 assemble_name_raw (file, name);
2484 /* Allocate SIZE bytes writable static space with a gensym name
2485 and return an RTX to refer to its address. */
2488 assemble_static_space (unsigned HOST_WIDE_INT size)
2491 const char *namestring;
2494 ASM_GENERATE_INTERNAL_LABEL (name, "LF", const_labelno);
2496 namestring = ggc_strdup (name);
2498 x = gen_rtx_SYMBOL_REF (Pmode, namestring);
2499 SYMBOL_REF_FLAGS (x) = SYMBOL_FLAG_LOCAL;
2501 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2502 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, NULL_TREE, name, size,
2505 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2506 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, BIGGEST_ALIGNMENT);
2509 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2510 so that each uninitialized object starts on such a boundary. */
2511 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2512 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2513 = ((size + (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1)
2514 / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
2515 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
2516 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
2523 /* Assemble the static constant template for function entry trampolines.
2524 This is done at most once per compilation.
2525 Returns an RTX for the address of the template. */
2527 static GTY(()) rtx initial_trampoline;
2530 assemble_trampoline_template (void)
2537 gcc_assert (targetm.asm_out.trampoline_template != NULL);
2539 if (initial_trampoline)
2540 return initial_trampoline;
2542 /* By default, put trampoline templates in read-only data section. */
2544 #ifdef TRAMPOLINE_SECTION
2545 switch_to_section (TRAMPOLINE_SECTION);
2547 switch_to_section (readonly_data_section);
2550 /* Write the assembler code to define one. */
2551 align = floor_log2 (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT);
2553 ASM_OUTPUT_ALIGN (asm_out_file, align);
2555 targetm.asm_out.internal_label (asm_out_file, "LTRAMP", 0);
2556 targetm.asm_out.trampoline_template (asm_out_file);
2558 /* Record the rtl to refer to it. */
2559 ASM_GENERATE_INTERNAL_LABEL (label, "LTRAMP", 0);
2560 name = ggc_strdup (label);
2561 symbol = gen_rtx_SYMBOL_REF (Pmode, name);
2562 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_LOCAL;
2564 initial_trampoline = gen_const_mem (BLKmode, symbol);
2565 set_mem_align (initial_trampoline, TRAMPOLINE_ALIGNMENT);
2566 set_mem_size (initial_trampoline, GEN_INT (TRAMPOLINE_SIZE));
2568 return initial_trampoline;
2571 /* A and B are either alignments or offsets. Return the minimum alignment
2572 that may be assumed after adding the two together. */
2574 static inline unsigned
2575 min_align (unsigned int a, unsigned int b)
2577 return (a | b) & -(a | b);
2580 /* Return the assembler directive for creating a given kind of integer
2581 object. SIZE is the number of bytes in the object and ALIGNED_P
2582 indicates whether it is known to be aligned. Return NULL if the
2583 assembly dialect has no such directive.
2585 The returned string should be printed at the start of a new line and
2586 be followed immediately by the object's initial value. */
2589 integer_asm_op (int size, int aligned_p)
2591 struct asm_int_op *ops;
2594 ops = &targetm.asm_out.aligned_op;
2596 ops = &targetm.asm_out.unaligned_op;
2601 return targetm.asm_out.byte_op;
2615 /* Use directive OP to assemble an integer object X. Print OP at the
2616 start of the line, followed immediately by the value of X. */
2619 assemble_integer_with_op (const char *op, rtx x)
2621 fputs (op, asm_out_file);
2622 output_addr_const (asm_out_file, x);
2623 fputc ('\n', asm_out_file);
2626 /* The default implementation of the asm_out.integer target hook. */
2629 default_assemble_integer (rtx x ATTRIBUTE_UNUSED,
2630 unsigned int size ATTRIBUTE_UNUSED,
2631 int aligned_p ATTRIBUTE_UNUSED)
2633 const char *op = integer_asm_op (size, aligned_p);
2634 /* Avoid GAS bugs for large values. Specifically negative values whose
2635 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2636 if (size > UNITS_PER_WORD && size > POINTER_SIZE / BITS_PER_UNIT)
2638 return op && (assemble_integer_with_op (op, x), true);
2641 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2642 the alignment of the integer in bits. Return 1 if we were able to output
2643 the constant, otherwise 0. We must be able to output the constant,
2644 if FORCE is nonzero. */
2647 assemble_integer (rtx x, unsigned int size, unsigned int align, int force)
2651 aligned_p = (align >= MIN (size * BITS_PER_UNIT, BIGGEST_ALIGNMENT));
2653 /* See if the target hook can handle this kind of object. */
2654 if (targetm.asm_out.integer (x, size, aligned_p))
2657 /* If the object is a multi-byte one, try splitting it up. Split
2658 it into words it if is multi-word, otherwise split it into bytes. */
2661 enum machine_mode omode, imode;
2662 unsigned int subalign;
2663 unsigned int subsize, i;
2664 enum mode_class mclass;
2666 subsize = size > UNITS_PER_WORD? UNITS_PER_WORD : 1;
2667 subalign = MIN (align, subsize * BITS_PER_UNIT);
2668 if (GET_CODE (x) == CONST_FIXED)
2669 mclass = GET_MODE_CLASS (GET_MODE (x));
2673 omode = mode_for_size (subsize * BITS_PER_UNIT, mclass, 0);
2674 imode = mode_for_size (size * BITS_PER_UNIT, mclass, 0);
2676 for (i = 0; i < size; i += subsize)
2678 rtx partial = simplify_subreg (omode, x, imode, i);
2679 if (!partial || !assemble_integer (partial, subsize, subalign, 0))
2685 /* If we've printed some of it, but not all of it, there's no going
2690 gcc_assert (!force);
2696 assemble_real (REAL_VALUE_TYPE d, enum machine_mode mode, unsigned int align)
2698 long data[4] = {0, 0, 0, 0};
2700 int bitsize, nelts, nunits, units_per;
2702 /* This is hairy. We have a quantity of known size. real_to_target
2703 will put it into an array of *host* longs, 32 bits per element
2704 (even if long is more than 32 bits). We need to determine the
2705 number of array elements that are occupied (nelts) and the number
2706 of *target* min-addressable units that will be occupied in the
2707 object file (nunits). We cannot assume that 32 divides the
2708 mode's bitsize (size * BITS_PER_UNIT) evenly.
2710 size * BITS_PER_UNIT is used here to make sure that padding bits
2711 (which might appear at either end of the value; real_to_target
2712 will include the padding bits in its output array) are included. */
2714 nunits = GET_MODE_SIZE (mode);
2715 bitsize = nunits * BITS_PER_UNIT;
2716 nelts = CEIL (bitsize, 32);
2717 units_per = 32 / BITS_PER_UNIT;
2719 real_to_target (data, &d, mode);
2721 /* Put out the first word with the specified alignment. */
2722 assemble_integer (GEN_INT (data[0]), MIN (nunits, units_per), align, 1);
2723 nunits -= units_per;
2725 /* Subsequent words need only 32-bit alignment. */
2726 align = min_align (align, 32);
2728 for (i = 1; i < nelts; i++)
2730 assemble_integer (GEN_INT (data[i]), MIN (nunits, units_per), align, 1);
2731 nunits -= units_per;
2735 /* Given an expression EXP with a constant value,
2736 reduce it to the sum of an assembler symbol and an integer.
2737 Store them both in the structure *VALUE.
2738 EXP must be reducible. */
2740 struct GTY(()) addr_const {
2742 HOST_WIDE_INT offset;
2746 decode_addr_const (tree exp, struct addr_const *value)
2748 tree target = TREE_OPERAND (exp, 0);
2754 if (TREE_CODE (target) == COMPONENT_REF
2755 && host_integerp (byte_position (TREE_OPERAND (target, 1)), 0))
2758 offset += int_byte_position (TREE_OPERAND (target, 1));
2759 target = TREE_OPERAND (target, 0);
2761 else if (TREE_CODE (target) == ARRAY_REF
2762 || TREE_CODE (target) == ARRAY_RANGE_REF)
2764 offset += (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target)), 1)
2765 * tree_low_cst (TREE_OPERAND (target, 1), 0));
2766 target = TREE_OPERAND (target, 0);
2772 switch (TREE_CODE (target))
2776 x = DECL_RTL (target);
2780 x = gen_rtx_MEM (FUNCTION_MODE,
2781 gen_rtx_LABEL_REF (Pmode, force_label_rtx (target)));
2790 x = output_constant_def (target, 1);
2797 gcc_assert (MEM_P (x));
2801 value->offset = offset;
2805 static GTY((param_is (struct constant_descriptor_tree)))
2806 htab_t const_desc_htab;
2808 static struct constant_descriptor_tree * build_constant_desc (tree);
2809 static void maybe_output_constant_def_contents (struct constant_descriptor_tree *, int);
2811 /* Constant pool accessor function. */
2814 constant_pool_htab (void)
2816 return const_desc_htab;
2819 /* Compute a hash code for a constant expression. */
2822 const_desc_hash (const void *ptr)
2824 return ((const struct constant_descriptor_tree *)ptr)->hash;
2828 const_hash_1 (const tree exp)
2833 enum tree_code code = TREE_CODE (exp);
2835 /* Either set P and LEN to the address and len of something to hash and
2836 exit the switch or return a value. */
2841 p = (char *) &TREE_INT_CST (exp);
2842 len = sizeof TREE_INT_CST (exp);
2846 return real_hash (TREE_REAL_CST_PTR (exp));
2849 return fixed_hash (TREE_FIXED_CST_PTR (exp));
2852 p = TREE_STRING_POINTER (exp);
2853 len = TREE_STRING_LENGTH (exp);
2857 return (const_hash_1 (TREE_REALPART (exp)) * 5
2858 + const_hash_1 (TREE_IMAGPART (exp)));
2862 unsigned HOST_WIDE_INT idx;
2865 hi = 5 + int_size_in_bytes (TREE_TYPE (exp));
2867 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, value)
2869 hi = hi * 603 + const_hash_1 (value);
2877 struct addr_const value;
2879 decode_addr_const (exp, &value);
2880 switch (GET_CODE (value.base))
2883 /* Don't hash the address of the SYMBOL_REF;
2884 only use the offset and the symbol name. */
2886 p = XSTR (value.base, 0);
2887 for (i = 0; p[i] != 0; i++)
2888 hi = ((hi * 613) + (unsigned) (p[i]));
2892 hi = value.offset + CODE_LABEL_NUMBER (XEXP (value.base, 0)) * 13;
2902 case POINTER_PLUS_EXPR:
2904 return (const_hash_1 (TREE_OPERAND (exp, 0)) * 9
2905 + const_hash_1 (TREE_OPERAND (exp, 1)));
2908 return const_hash_1 (TREE_OPERAND (exp, 0)) * 7 + 2;
2911 /* A language specific constant. Just hash the code. */
2915 /* Compute hashing function. */
2917 for (i = 0; i < len; i++)
2918 hi = ((hi * 613) + (unsigned) (p[i]));
2923 /* Wrapper of compare_constant, for the htab interface. */
2925 const_desc_eq (const void *p1, const void *p2)
2927 const struct constant_descriptor_tree *const c1
2928 = (const struct constant_descriptor_tree *) p1;
2929 const struct constant_descriptor_tree *const c2
2930 = (const struct constant_descriptor_tree *) p2;
2931 if (c1->hash != c2->hash)
2933 return compare_constant (c1->value, c2->value);
2936 /* Compare t1 and t2, and return 1 only if they are known to result in
2937 the same bit pattern on output. */
2940 compare_constant (const tree t1, const tree t2)
2942 enum tree_code typecode;
2944 if (t1 == NULL_TREE)
2945 return t2 == NULL_TREE;
2946 if (t2 == NULL_TREE)
2949 if (TREE_CODE (t1) != TREE_CODE (t2))
2952 switch (TREE_CODE (t1))
2955 /* Integer constants are the same only if the same width of type. */
2956 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2958 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2960 return tree_int_cst_equal (t1, t2);
2963 /* Real constants are the same only if the same width of type. */
2964 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2967 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2));
2970 /* Fixed constants are the same only if the same width of type. */
2971 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2974 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1), TREE_FIXED_CST (t2));
2977 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2980 return (TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
2981 && ! memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
2982 TREE_STRING_LENGTH (t1)));
2985 return (compare_constant (TREE_REALPART (t1), TREE_REALPART (t2))
2986 && compare_constant (TREE_IMAGPART (t1), TREE_IMAGPART (t2)));
2990 VEC(constructor_elt, gc) *v1, *v2;
2991 unsigned HOST_WIDE_INT idx;
2993 typecode = TREE_CODE (TREE_TYPE (t1));
2994 if (typecode != TREE_CODE (TREE_TYPE (t2)))
2997 if (typecode == ARRAY_TYPE)
2999 HOST_WIDE_INT size_1 = int_size_in_bytes (TREE_TYPE (t1));
3000 /* For arrays, check that the sizes all match. */
3001 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2))
3003 || size_1 != int_size_in_bytes (TREE_TYPE (t2)))
3008 /* For record and union constructors, require exact type
3010 if (TREE_TYPE (t1) != TREE_TYPE (t2))
3014 v1 = CONSTRUCTOR_ELTS (t1);
3015 v2 = CONSTRUCTOR_ELTS (t2);
3016 if (VEC_length (constructor_elt, v1)
3017 != VEC_length (constructor_elt, v2))
3020 for (idx = 0; idx < VEC_length (constructor_elt, v1); ++idx)
3022 constructor_elt *c1 = VEC_index (constructor_elt, v1, idx);
3023 constructor_elt *c2 = VEC_index (constructor_elt, v2, idx);
3025 /* Check that each value is the same... */
3026 if (!compare_constant (c1->value, c2->value))
3028 /* ... and that they apply to the same fields! */
3029 if (typecode == ARRAY_TYPE)
3031 if (!compare_constant (c1->index, c2->index))
3036 if (c1->index != c2->index)
3047 struct addr_const value1, value2;
3049 decode_addr_const (t1, &value1);
3050 decode_addr_const (t2, &value2);
3051 return (value1.offset == value2.offset
3052 && strcmp (XSTR (value1.base, 0), XSTR (value2.base, 0)) == 0);
3056 case POINTER_PLUS_EXPR:
3059 return (compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0))
3060 && compare_constant(TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1)));
3063 case VIEW_CONVERT_EXPR:
3064 return compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3073 /* Make a copy of the whole tree structure for a constant. This
3074 handles the same types of nodes that compare_constant handles. */
3077 copy_constant (tree exp)
3079 switch (TREE_CODE (exp))
3082 /* For ADDR_EXPR, we do not want to copy the decl whose address
3083 is requested. We do want to copy constants though. */
3084 if (CONSTANT_CLASS_P (TREE_OPERAND (exp, 0)))
3085 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
3086 copy_constant (TREE_OPERAND (exp, 0)));
3088 return copy_node (exp);
3094 return copy_node (exp);
3097 return build_complex (TREE_TYPE (exp),
3098 copy_constant (TREE_REALPART (exp)),
3099 copy_constant (TREE_IMAGPART (exp)));
3102 case POINTER_PLUS_EXPR:
3104 return build2 (TREE_CODE (exp), TREE_TYPE (exp),
3105 copy_constant (TREE_OPERAND (exp, 0)),
3106 copy_constant (TREE_OPERAND (exp, 1)));
3109 case VIEW_CONVERT_EXPR:
3110 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
3111 copy_constant (TREE_OPERAND (exp, 0)));
3115 tree copy = copy_node (exp);
3116 VEC(constructor_elt, gc) *v;
3117 unsigned HOST_WIDE_INT idx;
3118 tree purpose, value;
3120 v = VEC_alloc(constructor_elt, gc, VEC_length(constructor_elt,
3121 CONSTRUCTOR_ELTS (exp)));
3122 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp), idx, purpose, value)
3124 constructor_elt *ce = VEC_quick_push (constructor_elt, v, NULL);
3125 ce->index = purpose;
3126 ce->value = copy_constant (value);
3128 CONSTRUCTOR_ELTS (copy) = v;
3137 /* Return the alignment of constant EXP in bits. */
3140 get_constant_alignment (tree exp)
3144 align = TYPE_ALIGN (TREE_TYPE (exp));
3145 #ifdef CONSTANT_ALIGNMENT
3146 align = CONSTANT_ALIGNMENT (exp, align);
3151 /* Return the section into which constant EXP should be placed. */
3154 get_constant_section (tree exp)
3156 if (IN_NAMED_SECTION (exp))
3157 return get_named_section (exp, NULL, compute_reloc_for_constant (exp));
3159 return targetm.asm_out.select_section (exp,
3160 compute_reloc_for_constant (exp),
3161 get_constant_alignment (exp));
3164 /* Return the size of constant EXP in bytes. */
3166 static HOST_WIDE_INT
3167 get_constant_size (tree exp)
3171 size = int_size_in_bytes (TREE_TYPE (exp));
3172 if (TREE_CODE (exp) == STRING_CST)
3173 size = MAX (TREE_STRING_LENGTH (exp), size);
3177 /* Subroutine of output_constant_def:
3178 No constant equal to EXP is known to have been output.
3179 Make a constant descriptor to enter EXP in the hash table.
3180 Assign the label number and construct RTL to refer to the
3181 constant's location in memory.
3182 Caller is responsible for updating the hash table. */
3184 static struct constant_descriptor_tree *
3185 build_constant_desc (tree exp)
3191 struct constant_descriptor_tree *desc;
3193 desc = GGC_NEW (struct constant_descriptor_tree);
3194 desc->value = copy_constant (exp);
3196 /* Propagate marked-ness to copied constant. */
3197 if (flag_mudflap && mf_marked_p (exp))
3198 mf_mark (desc->value);
3200 /* Create a string containing the label name, in LABEL. */
3201 labelno = const_labelno++;
3202 ASM_GENERATE_INTERNAL_LABEL (label, "LC", labelno);
3204 /* We have a symbol name; construct the SYMBOL_REF and the MEM. */
3205 if (use_object_blocks_p ())
3207 section *sect = get_constant_section (exp);
3208 symbol = create_block_symbol (ggc_strdup (label),
3209 get_block_for_section (sect), -1);
3212 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3213 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3214 SET_SYMBOL_REF_DECL (symbol, desc->value);
3215 TREE_CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3217 rtl = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), symbol);
3218 set_mem_attributes (rtl, exp, 1);
3219 set_mem_alias_set (rtl, 0);
3220 set_mem_alias_set (rtl, const_alias_set);
3222 /* We cannot share RTX'es in pool entries.
3223 Mark this piece of RTL as required for unsharing. */
3224 RTX_FLAG (rtl, used) = 1;
3226 /* Set flags or add text to the name to record information, such as
3227 that it is a local symbol. If the name is changed, the macro
3228 ASM_OUTPUT_LABELREF will have to know how to strip this
3229 information. This call might invalidate our local variable
3230 SYMBOL; we can't use it afterward. */
3232 targetm.encode_section_info (exp, rtl, true);
3239 /* Return an rtx representing a reference to constant data in memory
3240 for the constant expression EXP.
3242 If assembler code for such a constant has already been output,
3243 return an rtx to refer to it.
3244 Otherwise, output such a constant in memory
3245 and generate an rtx for it.
3247 If DEFER is nonzero, this constant can be deferred and output only
3248 if referenced in the function after all optimizations.
3250 `const_desc_table' records which constants already have label strings. */
3253 output_constant_def (tree exp, int defer)
3255 struct constant_descriptor_tree *desc;
3256 struct constant_descriptor_tree key;
3259 /* Look up EXP in the table of constant descriptors. If we didn't find
3260 it, create a new one. */
3262 key.hash = const_hash_1 (exp);
3263 loc = htab_find_slot_with_hash (const_desc_htab, &key, key.hash, INSERT);
3265 desc = (struct constant_descriptor_tree *) *loc;
3268 desc = build_constant_desc (exp);
3269 desc->hash = key.hash;
3273 maybe_output_constant_def_contents (desc, defer);
3277 /* Subroutine of output_constant_def: Decide whether or not we need to
3278 output the constant DESC now, and if so, do it. */
3280 maybe_output_constant_def_contents (struct constant_descriptor_tree *desc,
3283 rtx symbol = XEXP (desc->rtl, 0);
3284 tree exp = desc->value;
3286 if (flag_syntax_only)
3289 if (TREE_ASM_WRITTEN (exp))
3290 /* Already output; don't do it again. */
3293 /* We can always defer constants as long as the context allows
3297 /* Increment n_deferred_constants if it exists. It needs to be at
3298 least as large as the number of constants actually referred to
3299 by the function. If it's too small we'll stop looking too early
3300 and fail to emit constants; if it's too large we'll only look
3301 through the entire function when we could have stopped earlier. */
3303 n_deferred_constants++;
3307 output_constant_def_contents (symbol);
3310 /* Subroutine of output_constant_def_contents. Output the definition
3311 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3312 constant's alignment in bits. */
3315 assemble_constant_contents (tree exp, const char *label, unsigned int align)
3319 size = get_constant_size (exp);
3321 /* Do any machine/system dependent processing of the constant. */
3322 #ifdef ASM_DECLARE_CONSTANT_NAME
3323 ASM_DECLARE_CONSTANT_NAME (asm_out_file, label, exp, size);
3325 /* Standard thing is just output label for the constant. */
3326 ASM_OUTPUT_LABEL (asm_out_file, label);
3327 #endif /* ASM_DECLARE_CONSTANT_NAME */
3329 /* Output the value of EXP. */
3330 output_constant (exp, size, align);
3333 /* We must output the constant data referred to by SYMBOL; do so. */
3336 output_constant_def_contents (rtx symbol)
3338 tree exp = SYMBOL_REF_DECL (symbol);
3341 /* Make sure any other constants whose addresses appear in EXP
3342 are assigned label numbers. */
3343 output_addressed_constants (exp);
3345 /* We are no longer deferring this constant. */
3346 TREE_ASM_WRITTEN (exp) = 1;
3348 /* If the constant is part of an object block, make sure that the
3349 decl has been positioned within its block, but do not write out
3350 its definition yet. output_object_blocks will do that later. */
3351 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
3352 place_block_symbol (symbol);
3355 switch_to_section (get_constant_section (exp));
3356 align = get_constant_alignment (exp);
3357 if (align > BITS_PER_UNIT)
3358 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
3359 assemble_constant_contents (exp, XSTR (symbol, 0), align);
3362 mudflap_enqueue_constant (exp);
3365 /* Look up EXP in the table of constant descriptors. Return the rtl
3366 if it has been emitted, else null. */
3369 lookup_constant_def (tree exp)
3371 struct constant_descriptor_tree *desc;
3372 struct constant_descriptor_tree key;
3375 key.hash = const_hash_1 (exp);
3376 desc = (struct constant_descriptor_tree *)
3377 htab_find_with_hash (const_desc_htab, &key, key.hash);
3379 return (desc ? desc->rtl : NULL_RTX);
3382 /* Used in the hash tables to avoid outputting the same constant
3383 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3384 are output once per function, not once per file. */
3385 /* ??? Only a few targets need per-function constant pools. Most
3386 can use one per-file pool. Should add a targetm bit to tell the
3389 struct GTY(()) rtx_constant_pool {
3390 /* Pointers to first and last constant in pool, as ordered by offset. */
3391 struct constant_descriptor_rtx *first;
3392 struct constant_descriptor_rtx *last;
3394 /* Hash facility for making memory-constants from constant rtl-expressions.
3395 It is used on RISC machines where immediate integer arguments and
3396 constant addresses are restricted so that such constants must be stored
3398 htab_t GTY((param_is (struct constant_descriptor_rtx))) const_rtx_htab;
3400 /* Current offset in constant pool (does not include any
3401 machine-specific header). */
3402 HOST_WIDE_INT offset;
3405 struct GTY((chain_next ("%h.next"))) constant_descriptor_rtx {
3406 struct constant_descriptor_rtx *next;
3410 HOST_WIDE_INT offset;
3412 enum machine_mode mode;
3418 /* Hash and compare functions for const_rtx_htab. */
3421 const_desc_rtx_hash (const void *ptr)
3423 const struct constant_descriptor_rtx *const desc
3424 = (const struct constant_descriptor_rtx *) ptr;
3429 const_desc_rtx_eq (const void *a, const void *b)
3431 const struct constant_descriptor_rtx *const x
3432 = (const struct constant_descriptor_rtx *) a;
3433 const struct constant_descriptor_rtx *const y
3434 = (const struct constant_descriptor_rtx *) b;
3436 if (x->mode != y->mode)
3438 return rtx_equal_p (x->constant, y->constant);
3441 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3444 const_rtx_hash_1 (rtx *xp, void *data)
3446 unsigned HOST_WIDE_INT hwi;
3447 enum machine_mode mode;
3453 code = GET_CODE (x);
3454 mode = GET_MODE (x);
3455 h = (hashval_t) code * 1048573 + mode;
3463 int shift = sizeof (hashval_t) * CHAR_BIT;
3464 const int n = sizeof (HOST_WIDE_INT) / sizeof (hashval_t);
3467 h ^= (hashval_t) hwi;
3468 for (i = 1; i < n; ++i)
3471 h ^= (hashval_t) hwi;
3477 if (mode == VOIDmode)
3479 hwi = CONST_DOUBLE_LOW (x) ^ CONST_DOUBLE_HIGH (x);
3483 h ^= real_hash (CONST_DOUBLE_REAL_VALUE (x));
3487 h ^= fixed_hash (CONST_FIXED_VALUE (x));
3493 for (i = XVECLEN (x, 0); i-- > 0; )
3494 h = h * 251 + const_rtx_hash_1 (&XVECEXP (x, 0, i), data);
3499 h ^= htab_hash_string (XSTR (x, 0));
3503 h = h * 251 + CODE_LABEL_NUMBER (XEXP (x, 0));
3507 case UNSPEC_VOLATILE:
3508 h = h * 251 + XINT (x, 1);
3515 hp = (hashval_t *) data;
3516 *hp = *hp * 509 + h;
3520 /* Compute a hash value for X, which should be a constant. */
3523 const_rtx_hash (rtx x)
3526 for_each_rtx (&x, const_rtx_hash_1, &h);
3531 /* Create and return a new rtx constant pool. */
3533 static struct rtx_constant_pool *
3534 create_constant_pool (void)
3536 struct rtx_constant_pool *pool;
3538 pool = GGC_NEW (struct rtx_constant_pool);
3539 pool->const_rtx_htab = htab_create_ggc (31, const_desc_rtx_hash,
3540 const_desc_rtx_eq, NULL);
3547 /* Initialize constant pool hashing for a new function. */
3550 init_varasm_status (void)
3552 crtl->varasm.pool = create_constant_pool ();
3553 crtl->varasm.deferred_constants = 0;
3556 /* Given a MINUS expression, simplify it if both sides
3557 include the same symbol. */
3560 simplify_subtraction (rtx x)
3562 rtx r = simplify_rtx (x);
3566 /* Given a constant rtx X, make (or find) a memory constant for its value
3567 and return a MEM rtx to refer to it in memory. */
3570 force_const_mem (enum machine_mode mode, rtx x)
3572 struct constant_descriptor_rtx *desc, tmp;
3573 struct rtx_constant_pool *pool;
3580 /* If we're not allowed to drop X into the constant pool, don't. */
3581 if (targetm.cannot_force_const_mem (x))
3584 /* Record that this function has used a constant pool entry. */
3585 crtl->uses_const_pool = 1;
3587 /* Decide which pool to use. */
3588 pool = (targetm.use_blocks_for_constant_p (mode, x)
3589 ? shared_constant_pool
3590 : crtl->varasm.pool);
3592 /* Lookup the value in the hashtable. */
3595 hash = const_rtx_hash (x);
3596 slot = htab_find_slot_with_hash (pool->const_rtx_htab, &tmp, hash, INSERT);
3597 desc = (struct constant_descriptor_rtx *) *slot;
3599 /* If the constant was already present, return its memory. */
3601 return copy_rtx (desc->mem);
3603 /* Otherwise, create a new descriptor. */
3604 desc = GGC_NEW (struct constant_descriptor_rtx);
3607 /* Align the location counter as required by EXP's data type. */
3608 align = GET_MODE_ALIGNMENT (mode == VOIDmode ? word_mode : mode);
3609 #ifdef CONSTANT_ALIGNMENT
3611 tree type = lang_hooks.types.type_for_mode (mode, 0);
3612 if (type != NULL_TREE)
3613 align = CONSTANT_ALIGNMENT (make_tree (type, x), align);
3617 pool->offset += (align / BITS_PER_UNIT) - 1;
3618 pool->offset &= ~ ((align / BITS_PER_UNIT) - 1);
3621 desc->constant = tmp.constant;
3622 desc->offset = pool->offset;
3625 desc->align = align;
3626 desc->labelno = const_labelno;
3629 pool->offset += GET_MODE_SIZE (mode);
3631 pool->last->next = desc;
3633 pool->first = pool->last = desc;
3636 /* Create a string containing the label name, in LABEL. */
3637 ASM_GENERATE_INTERNAL_LABEL (label, "LC", const_labelno);
3640 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3641 the constants pool. */
3642 if (use_object_blocks_p () && targetm.use_blocks_for_constant_p (mode, x))
3644 section *sect = targetm.asm_out.select_rtx_section (mode, x, align);
3645 symbol = create_block_symbol (ggc_strdup (label),
3646 get_block_for_section (sect), -1);
3649 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3651 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3652 CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3653 SET_SYMBOL_REF_CONSTANT (symbol, desc);
3655 /* Construct the MEM. */
3656 desc->mem = def = gen_const_mem (mode, symbol);
3657 set_mem_attributes (def, lang_hooks.types.type_for_mode (mode, 0), 1);
3658 set_mem_align (def, align);
3660 /* If we're dropping a label to the constant pool, make sure we
3662 if (GET_CODE (x) == LABEL_REF)
3663 LABEL_PRESERVE_P (XEXP (x, 0)) = 1;
3665 return copy_rtx (def);
3668 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3671 get_pool_constant (rtx addr)
3673 return SYMBOL_REF_CONSTANT (addr)->constant;
3676 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3677 and whether it has been output or not. */
3680 get_pool_constant_mark (rtx addr, bool *pmarked)
3682 struct constant_descriptor_rtx *desc;
3684 desc = SYMBOL_REF_CONSTANT (addr);
3685 *pmarked = (desc->mark != 0);
3686 return desc->constant;
3689 /* Similar, return the mode. */
3692 get_pool_mode (const_rtx addr)
3694 return SYMBOL_REF_CONSTANT (addr)->mode;
3697 /* Return the size of the constant pool. */
3700 get_pool_size (void)
3702 return crtl->varasm.pool->offset;
3705 /* Worker function for output_constant_pool_1. Emit assembly for X
3706 in MODE with known alignment ALIGN. */
3709 output_constant_pool_2 (enum machine_mode mode, rtx x, unsigned int align)
3711 switch (GET_MODE_CLASS (mode))
3714 case MODE_DECIMAL_FLOAT:
3718 gcc_assert (GET_CODE (x) == CONST_DOUBLE);
3719 REAL_VALUE_FROM_CONST_DOUBLE (r, x);
3720 assemble_real (r, mode, align);
3725 case MODE_PARTIAL_INT:
3730 assemble_integer (x, GET_MODE_SIZE (mode), align, 1);
3733 case MODE_VECTOR_FLOAT:
3734 case MODE_VECTOR_INT:
3735 case MODE_VECTOR_FRACT:
3736 case MODE_VECTOR_UFRACT:
3737 case MODE_VECTOR_ACCUM:
3738 case MODE_VECTOR_UACCUM:
3741 enum machine_mode submode = GET_MODE_INNER (mode);
3742 unsigned int subalign = MIN (align, GET_MODE_BITSIZE (submode));
3744 gcc_assert (GET_CODE (x) == CONST_VECTOR);
3745 units = CONST_VECTOR_NUNITS (x);
3747 for (i = 0; i < units; i++)
3749 rtx elt = CONST_VECTOR_ELT (x, i);
3750 output_constant_pool_2 (submode, elt, i ? subalign : align);
3760 /* Worker function for output_constant_pool. Emit constant DESC,
3761 giving it ALIGN bits of alignment. */
3764 output_constant_pool_1 (struct constant_descriptor_rtx *desc,
3771 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3772 whose CODE_LABEL has been deleted. This can occur if a jump table
3773 is eliminated by optimization. If so, write a constant of zero
3774 instead. Note that this can also happen by turning the
3775 CODE_LABEL into a NOTE. */
3776 /* ??? This seems completely and utterly wrong. Certainly it's
3777 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3778 functioning even with INSN_DELETED_P and friends. */
3781 switch (GET_CODE (tmp))
3784 if (GET_CODE (XEXP (tmp, 0)) != PLUS
3785 || GET_CODE (XEXP (XEXP (tmp, 0), 0)) != LABEL_REF)
3787 tmp = XEXP (XEXP (tmp, 0), 0);
3791 tmp = XEXP (tmp, 0);
3792 gcc_assert (!INSN_DELETED_P (tmp));
3793 gcc_assert (!NOTE_P (tmp)
3794 || NOTE_KIND (tmp) != NOTE_INSN_DELETED);
3801 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3802 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file, x, desc->mode,
3803 align, desc->labelno, done);
3806 assemble_align (align);
3808 /* Output the label. */
3809 targetm.asm_out.internal_label (asm_out_file, "LC", desc->labelno);
3811 /* Output the data. */
3812 output_constant_pool_2 (desc->mode, x, align);
3814 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3815 sections have proper size. */
3816 if (align > GET_MODE_BITSIZE (desc->mode)
3818 && (in_section->common.flags & SECTION_MERGE))
3819 assemble_align (align);
3821 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3827 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3828 to as used. Emit referenced deferred strings. This function can
3829 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3832 mark_constant (rtx *current_rtx, void *data ATTRIBUTE_UNUSED)
3834 rtx x = *current_rtx;
3836 if (x == NULL_RTX || GET_CODE (x) != SYMBOL_REF)
3839 if (CONSTANT_POOL_ADDRESS_P (x))
3841 struct constant_descriptor_rtx *desc = SYMBOL_REF_CONSTANT (x);
3842 if (desc->mark == 0)
3845 for_each_rtx (&desc->constant, mark_constant, NULL);
3848 else if (TREE_CONSTANT_POOL_ADDRESS_P (x))
3850 tree exp = SYMBOL_REF_DECL (x);
3851 if (!TREE_ASM_WRITTEN (exp))
3853 n_deferred_constants--;
3854 output_constant_def_contents (x);
3861 /* Look through appropriate parts of INSN, marking all entries in the
3862 constant pool which are actually being used. Entries that are only
3863 referenced by other constants are also marked as used. Emit
3864 deferred strings that are used. */
3867 mark_constants (rtx insn)
3872 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3873 insns, not any notes that may be attached. We don't want to mark
3874 a constant just because it happens to appear in a REG_EQUIV note. */
3875 if (GET_CODE (PATTERN (insn)) == SEQUENCE)
3877 rtx seq = PATTERN (insn);
3878 int i, n = XVECLEN (seq, 0);
3879 for (i = 0; i < n; ++i)
3881 rtx subinsn = XVECEXP (seq, 0, i);
3882 if (INSN_P (subinsn))
3883 for_each_rtx (&PATTERN (subinsn), mark_constant, NULL);
3887 for_each_rtx (&PATTERN (insn), mark_constant, NULL);
3890 /* Look through the instructions for this function, and mark all the
3891 entries in POOL which are actually being used. Emit deferred constants
3892 which have indeed been used. */
3895 mark_constant_pool (void)
3899 if (!crtl->uses_const_pool && n_deferred_constants == 0)
3902 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
3903 mark_constants (insn);
3905 for (link = crtl->epilogue_delay_list;
3907 link = XEXP (link, 1))
3908 mark_constants (XEXP (link, 0));
3911 /* Write all the constants in POOL. */
3914 output_constant_pool_contents (struct rtx_constant_pool *pool)
3916 struct constant_descriptor_rtx *desc;
3918 for (desc = pool->first; desc ; desc = desc->next)
3921 /* If the constant is part of an object_block, make sure that
3922 the constant has been positioned within its block, but do not
3923 write out its definition yet. output_object_blocks will do
3925 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc->sym)
3926 && SYMBOL_REF_BLOCK (desc->sym))
3927 place_block_symbol (desc->sym);
3930 switch_to_section (targetm.asm_out.select_rtx_section
3931 (desc->mode, desc->constant, desc->align));
3932 output_constant_pool_1 (desc, desc->align);
3937 /* Mark all constants that are used in the current function, then write
3938 out the function's private constant pool. */
3941 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED,
3942 tree fndecl ATTRIBUTE_UNUSED)
3944 struct rtx_constant_pool *pool = crtl->varasm.pool;
3946 /* It is possible for gcc to call force_const_mem and then to later
3947 discard the instructions which refer to the constant. In such a
3948 case we do not need to output the constant. */
3949 mark_constant_pool ();
3951 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3952 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file, fnname, fndecl, pool->offset);
3955 output_constant_pool_contents (pool);
3957 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3958 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file, fnname, fndecl, pool->offset);
3962 /* Write the contents of the shared constant pool. */
3965 output_shared_constant_pool (void)
3967 output_constant_pool_contents (shared_constant_pool);
3970 /* Determine what kind of relocations EXP may need. */
3973 compute_reloc_for_constant (tree exp)
3975 int reloc = 0, reloc2;
3978 switch (TREE_CODE (exp))
3982 /* Go inside any operations that get_inner_reference can handle and see
3983 if what's inside is a constant: no need to do anything here for
3984 addresses of variables or functions. */
3985 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
3986 tem = TREE_OPERAND (tem, 0))
3989 if (TREE_PUBLIC (tem))
3996 case POINTER_PLUS_EXPR:
3997 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3998 reloc |= compute_reloc_for_constant (TREE_OPERAND (exp, 1));
4002 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
4003 reloc2 = compute_reloc_for_constant (TREE_OPERAND (exp, 1));
4004 /* The difference of two local labels is computable at link time. */
4005 if (reloc == 1 && reloc2 == 1)
4012 case VIEW_CONVERT_EXPR:
4013 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
4018 unsigned HOST_WIDE_INT idx;
4019 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
4021 reloc |= compute_reloc_for_constant (tem);
4031 /* Find all the constants whose addresses are referenced inside of EXP,
4032 and make sure assembler code with a label has been output for each one.
4033 Indicate whether an ADDR_EXPR has been encountered. */
4036 output_addressed_constants (tree exp)
4040 switch (TREE_CODE (exp))
4044 /* Go inside any operations that get_inner_reference can handle and see
4045 if what's inside is a constant: no need to do anything here for
4046 addresses of variables or functions. */
4047 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
4048 tem = TREE_OPERAND (tem, 0))
4051 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4052 if (TREE_CODE (tem) == CONST_DECL && DECL_INITIAL (tem))
4053 tem = DECL_INITIAL (tem);
4055 if (CONSTANT_CLASS_P (tem) || TREE_CODE (tem) == CONSTRUCTOR)
4056 output_constant_def (tem, 0);
4060 case POINTER_PLUS_EXPR:
4062 output_addressed_constants (TREE_OPERAND (exp, 1));
4066 case VIEW_CONVERT_EXPR:
4067 output_addressed_constants (TREE_OPERAND (exp, 0));
4072 unsigned HOST_WIDE_INT idx;
4073 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
4075 output_addressed_constants (tem);
4084 /* Whether a constructor CTOR is a valid static constant initializer if all
4085 its elements are. This used to be internal to initializer_constant_valid_p
4086 and has been exposed to let other functions like categorize_ctor_elements
4087 evaluate the property while walking a constructor for other purposes. */
4090 constructor_static_from_elts_p (const_tree ctor)
4092 return (TREE_CONSTANT (ctor)
4093 && (TREE_CODE (TREE_TYPE (ctor)) == UNION_TYPE
4094 || TREE_CODE (TREE_TYPE (ctor)) == RECORD_TYPE)
4095 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (ctor)));
4098 static tree initializer_constant_valid_p_1 (tree value, tree endtype,
4101 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4102 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4103 which are valid when ENDTYPE is an integer of any size; in
4104 particular, this does not accept a pointer minus a constant. This
4105 returns null_pointer_node if the VALUE is an absolute constant
4106 which can be used to initialize a static variable. Otherwise it
4110 narrowing_initializer_constant_valid_p (tree value, tree endtype, tree *cache)
4114 if (!INTEGRAL_TYPE_P (endtype))
4117 op0 = TREE_OPERAND (value, 0);
4118 op1 = TREE_OPERAND (value, 1);
4120 /* Like STRIP_NOPS except allow the operand mode to widen. This
4121 works around a feature of fold that simplifies (int)(p1 - p2) to
4122 ((int)p1 - (int)p2) under the theory that the narrower operation
4125 while (CONVERT_EXPR_P (op0)
4126 || TREE_CODE (op0) == NON_LVALUE_EXPR)
4128 tree inner = TREE_OPERAND (op0, 0);
4129 if (inner == error_mark_node
4130 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
4131 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0)))
4132 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
4137 while (CONVERT_EXPR_P (op1)
4138 || TREE_CODE (op1) == NON_LVALUE_EXPR)
4140 tree inner = TREE_OPERAND (op1, 0);
4141 if (inner == error_mark_node
4142 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
4143 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1)))
4144 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
4149 op0 = initializer_constant_valid_p_1 (op0, endtype, cache);
4153 op1 = initializer_constant_valid_p_1 (op1, endtype,
4154 cache ? cache + 2 : NULL);
4155 /* Both initializers must be known. */
4159 && (op0 == null_pointer_node
4160 || TREE_CODE (value) == MINUS_EXPR))
4161 return null_pointer_node;
4163 /* Support differences between labels. */
4164 if (TREE_CODE (op0) == LABEL_DECL
4165 && TREE_CODE (op1) == LABEL_DECL)
4166 return null_pointer_node;
4168 if (TREE_CODE (op0) == STRING_CST
4169 && TREE_CODE (op1) == STRING_CST
4170 && operand_equal_p (op0, op1, 1))
4171 return null_pointer_node;
4177 /* Helper function of initializer_constant_valid_p.
4178 Return nonzero if VALUE is a valid constant-valued expression
4179 for use in initializing a static variable; one that can be an
4180 element of a "constant" initializer.
4182 Return null_pointer_node if the value is absolute;
4183 if it is relocatable, return the variable that determines the relocation.
4184 We assume that VALUE has been folded as much as possible;
4185 therefore, we do not need to check for such things as
4186 arithmetic-combinations of integers.
4188 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4191 initializer_constant_valid_p_1 (tree value, tree endtype, tree *cache)
4195 switch (TREE_CODE (value))
4198 if (constructor_static_from_elts_p (value))
4200 unsigned HOST_WIDE_INT idx;
4202 bool absolute = true;
4204 if (cache && cache[0] == value)
4206 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value), idx, elt)
4209 reloc = initializer_constant_valid_p_1 (elt, TREE_TYPE (elt),
4216 cache[1] = NULL_TREE;
4220 if (reloc != null_pointer_node)
4223 /* For a non-absolute relocation, there is no single
4224 variable that can be "the variable that determines the
4229 cache[1] = absolute ? null_pointer_node : error_mark_node;
4231 return absolute ? null_pointer_node : error_mark_node;
4234 return TREE_STATIC (value) ? null_pointer_node : NULL_TREE;
4242 return null_pointer_node;
4247 tree op0 = staticp (TREE_OPERAND (value, 0));
4250 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4251 to be a constant, this is old-skool offsetof-like nonsense. */
4252 if (TREE_CODE (op0) == INDIRECT_REF
4253 && TREE_CONSTANT (TREE_OPERAND (op0, 0)))
4254 return null_pointer_node;
4255 /* Taking the address of a nested function involves a trampoline,
4256 unless we don't need or want one. */
4257 if (TREE_CODE (op0) == FUNCTION_DECL
4258 && DECL_STATIC_CHAIN (op0)
4259 && !TREE_NO_TRAMPOLINE (value))
4261 /* "&{...}" requires a temporary to hold the constructed
4263 if (TREE_CODE (op0) == CONSTRUCTOR)
4269 case NON_LVALUE_EXPR:
4270 return initializer_constant_valid_p_1 (TREE_OPERAND (value, 0),
4273 case VIEW_CONVERT_EXPR:
4275 tree src = TREE_OPERAND (value, 0);
4276 tree src_type = TREE_TYPE (src);
4277 tree dest_type = TREE_TYPE (value);
4279 /* Allow view-conversions from aggregate to non-aggregate type only
4280 if the bit pattern is fully preserved afterwards; otherwise, the
4281 RTL expander won't be able to apply a subsequent transformation
4282 to the underlying constructor. */
4283 if (AGGREGATE_TYPE_P (src_type) && !AGGREGATE_TYPE_P (dest_type))
4285 if (TYPE_MODE (endtype) == TYPE_MODE (dest_type))
4286 return initializer_constant_valid_p_1 (src, endtype, cache);
4291 /* Allow all other kinds of view-conversion. */
4292 return initializer_constant_valid_p_1 (src, endtype, cache);
4297 tree src = TREE_OPERAND (value, 0);
4298 tree src_type = TREE_TYPE (src);
4299 tree dest_type = TREE_TYPE (value);
4301 /* Allow conversions between pointer types, floating-point
4302 types, and offset types. */
4303 if ((POINTER_TYPE_P (dest_type) && POINTER_TYPE_P (src_type))
4304 || (FLOAT_TYPE_P (dest_type) && FLOAT_TYPE_P (src_type))
4305 || (TREE_CODE (dest_type) == OFFSET_TYPE
4306 && TREE_CODE (src_type) == OFFSET_TYPE))
4307 return initializer_constant_valid_p_1 (src, endtype, cache);
4309 /* Allow length-preserving conversions between integer types. */
4310 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type)
4311 && (TYPE_PRECISION (dest_type) == TYPE_PRECISION (src_type)))
4312 return initializer_constant_valid_p_1 (src, endtype, cache);
4314 /* Allow conversions between other integer types only if
4316 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type))
4318 tree inner = initializer_constant_valid_p_1 (src, endtype, cache);
4319 if (inner == null_pointer_node)
4320 return null_pointer_node;
4324 /* Allow (int) &foo provided int is as wide as a pointer. */
4325 if (INTEGRAL_TYPE_P (dest_type) && POINTER_TYPE_P (src_type)
4326 && (TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type)))
4327 return initializer_constant_valid_p_1 (src, endtype, cache);
4329 /* Likewise conversions from int to pointers, but also allow
4330 conversions from 0. */
4331 if ((POINTER_TYPE_P (dest_type)
4332 || TREE_CODE (dest_type) == OFFSET_TYPE)
4333 && INTEGRAL_TYPE_P (src_type))
4335 if (TREE_CODE (src) == INTEGER_CST
4336 && TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type))
4337 return null_pointer_node;
4338 if (integer_zerop (src))
4339 return null_pointer_node;
4340 else if (TYPE_PRECISION (dest_type) <= TYPE_PRECISION (src_type))
4341 return initializer_constant_valid_p_1 (src, endtype, cache);
4344 /* Allow conversions to struct or union types if the value
4346 if (TREE_CODE (dest_type) == RECORD_TYPE
4347 || TREE_CODE (dest_type) == UNION_TYPE)
4348 return initializer_constant_valid_p_1 (src, endtype, cache);
4352 case POINTER_PLUS_EXPR:
4354 /* Any valid floating-point constants will have been folded by now;
4355 with -frounding-math we hit this with addition of two constants. */
4356 if (TREE_CODE (endtype) == REAL_TYPE)
4358 if (cache && cache[0] == value)
4360 if (! INTEGRAL_TYPE_P (endtype)
4361 || TYPE_PRECISION (endtype) >= TYPE_PRECISION (TREE_TYPE (value)))
4363 tree ncache[4] = { NULL_TREE, NULL_TREE, NULL_TREE, NULL_TREE };
4365 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 0),
4368 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 1),
4369 endtype, ncache + 2);
4370 /* If either term is absolute, use the other term's relocation. */
4371 if (valid0 == null_pointer_node)
4373 else if (valid1 == null_pointer_node)
4375 /* Support narrowing pointer differences. */
4377 ret = narrowing_initializer_constant_valid_p (value, endtype,
4381 /* Support narrowing pointer differences. */
4382 ret = narrowing_initializer_constant_valid_p (value, endtype, NULL);
4391 if (TREE_CODE (endtype) == REAL_TYPE)
4393 if (cache && cache[0] == value)
4395 if (! INTEGRAL_TYPE_P (endtype)
4396 || TYPE_PRECISION (endtype) >= TYPE_PRECISION (TREE_TYPE (value)))
4398 tree ncache[4] = { NULL_TREE, NULL_TREE, NULL_TREE, NULL_TREE };
4400 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 0),
4403 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 1),
4404 endtype, ncache + 2);
4405 /* Win if second argument is absolute. */
4406 if (valid1 == null_pointer_node)
4408 /* Win if both arguments have the same relocation.
4409 Then the value is absolute. */
4410 else if (valid0 == valid1 && valid0 != 0)
4411 ret = null_pointer_node;
4412 /* Since GCC guarantees that string constants are unique in the
4413 generated code, a subtraction between two copies of the same
4414 constant string is absolute. */
4415 else if (valid0 && TREE_CODE (valid0) == STRING_CST
4416 && valid1 && TREE_CODE (valid1) == STRING_CST
4417 && operand_equal_p (valid0, valid1, 1))
4418 ret = null_pointer_node;
4419 /* Support narrowing differences. */
4421 ret = narrowing_initializer_constant_valid_p (value, endtype,
4425 /* Support narrowing differences. */
4426 ret = narrowing_initializer_constant_valid_p (value, endtype, NULL);
4441 /* Return nonzero if VALUE is a valid constant-valued expression
4442 for use in initializing a static variable; one that can be an
4443 element of a "constant" initializer.
4445 Return null_pointer_node if the value is absolute;
4446 if it is relocatable, return the variable that determines the relocation.
4447 We assume that VALUE has been folded as much as possible;
4448 therefore, we do not need to check for such things as
4449 arithmetic-combinations of integers. */
4451 initializer_constant_valid_p (tree value, tree endtype)
4453 return initializer_constant_valid_p_1 (value, endtype, NULL);
4456 /* Return true if VALUE is a valid constant-valued expression
4457 for use in initializing a static bit-field; one that can be
4458 an element of a "constant" initializer. */
4461 initializer_constant_valid_for_bitfield_p (tree value)
4463 /* For bitfields we support integer constants or possibly nested aggregates
4465 switch (TREE_CODE (value))
4469 unsigned HOST_WIDE_INT idx;
4472 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value), idx, elt)
4473 if (!initializer_constant_valid_for_bitfield_p (elt))
4481 case VIEW_CONVERT_EXPR:
4482 case NON_LVALUE_EXPR:
4484 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value, 0));
4493 /* output_constructor outer state of relevance in recursive calls, typically
4494 for nested aggregate bitfields. */
4497 unsigned int bit_offset; /* current position in ... */
4498 int byte; /* ... the outer byte buffer. */
4501 static unsigned HOST_WIDE_INT
4502 output_constructor (tree, unsigned HOST_WIDE_INT, unsigned int,
4505 /* Output assembler code for constant EXP to FILE, with no label.
4506 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4507 Assumes output_addressed_constants has been done on EXP already.
4509 Generate exactly SIZE bytes of assembler data, padding at the end
4510 with zeros if necessary. SIZE must always be specified.
4512 SIZE is important for structure constructors,
4513 since trailing members may have been omitted from the constructor.
4514 It is also important for initialization of arrays from string constants
4515 since the full length of the string constant might not be wanted.
4516 It is also needed for initialization of unions, where the initializer's
4517 type is just one member, and that may not be as long as the union.
4519 There a case in which we would fail to output exactly SIZE bytes:
4520 for a structure constructor that wants to produce more than SIZE bytes.
4521 But such constructors will never be generated for any possible input.
4523 ALIGN is the alignment of the data in bits. */
4526 output_constant (tree exp, unsigned HOST_WIDE_INT size, unsigned int align)
4528 enum tree_code code;
4529 unsigned HOST_WIDE_INT thissize;
4531 if (size == 0 || flag_syntax_only)
4534 /* See if we're trying to initialize a pointer in a non-default mode
4535 to the address of some declaration somewhere. If the target says
4536 the mode is valid for pointers, assume the target has a way of
4538 if (TREE_CODE (exp) == NOP_EXPR
4539 && POINTER_TYPE_P (TREE_TYPE (exp))
4540 && targetm.addr_space.valid_pointer_mode
4541 (TYPE_MODE (TREE_TYPE (exp)),
4542 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp)))))
4544 tree saved_type = TREE_TYPE (exp);
4546 /* Peel off any intermediate conversions-to-pointer for valid
4548 while (TREE_CODE (exp) == NOP_EXPR
4549 && POINTER_TYPE_P (TREE_TYPE (exp))
4550 && targetm.addr_space.valid_pointer_mode
4551 (TYPE_MODE (TREE_TYPE (exp)),
4552 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp)))))
4553 exp = TREE_OPERAND (exp, 0);
4555 /* If what we're left with is the address of something, we can
4556 convert the address to the final type and output it that
4558 if (TREE_CODE (exp) == ADDR_EXPR)
4559 exp = build1 (ADDR_EXPR, saved_type, TREE_OPERAND (exp, 0));
4560 /* Likewise for constant ints. */
4561 else if (TREE_CODE (exp) == INTEGER_CST)
4562 exp = build_int_cst_wide (saved_type, TREE_INT_CST_LOW (exp),
4563 TREE_INT_CST_HIGH (exp));
4567 /* Eliminate any conversions since we'll be outputting the underlying
4569 while (CONVERT_EXPR_P (exp)
4570 || TREE_CODE (exp) == NON_LVALUE_EXPR
4571 || TREE_CODE (exp) == VIEW_CONVERT_EXPR)
4573 HOST_WIDE_INT type_size = int_size_in_bytes (TREE_TYPE (exp));
4574 HOST_WIDE_INT op_size = int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp, 0)));
4576 /* Make sure eliminating the conversion is really a no-op, except with
4577 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4578 union types to allow for Ada unchecked unions. */
4579 if (type_size > op_size
4580 && TREE_CODE (exp) != VIEW_CONVERT_EXPR
4581 && TREE_CODE (TREE_TYPE (exp)) != UNION_TYPE)
4582 /* Keep the conversion. */
4585 exp = TREE_OPERAND (exp, 0);
4588 code = TREE_CODE (TREE_TYPE (exp));
4589 thissize = int_size_in_bytes (TREE_TYPE (exp));
4591 /* Allow a constructor with no elements for any data type.
4592 This means to fill the space with zeros. */
4593 if (TREE_CODE (exp) == CONSTRUCTOR
4594 && VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (exp)))
4596 assemble_zeros (size);
4600 if (TREE_CODE (exp) == FDESC_EXPR)
4602 #ifdef ASM_OUTPUT_FDESC
4603 HOST_WIDE_INT part = tree_low_cst (TREE_OPERAND (exp, 1), 0);
4604 tree decl = TREE_OPERAND (exp, 0);
4605 ASM_OUTPUT_FDESC (asm_out_file, decl, part);
4612 /* Now output the underlying data. If we've handling the padding, return.
4613 Otherwise, break and ensure SIZE is the size written. */
4620 case REFERENCE_TYPE:
4622 case FIXED_POINT_TYPE:
4623 if (! assemble_integer (expand_expr (exp, NULL_RTX, VOIDmode,
4624 EXPAND_INITIALIZER),
4625 MIN (size, thissize), align, 0))
4626 error ("initializer for integer/fixed-point value is too complicated");
4630 if (TREE_CODE (exp) != REAL_CST)
4631 error ("initializer for floating value is not a floating constant");
4633 assemble_real (TREE_REAL_CST (exp), TYPE_MODE (TREE_TYPE (exp)), align);
4637 output_constant (TREE_REALPART (exp), thissize / 2, align);
4638 output_constant (TREE_IMAGPART (exp), thissize / 2,
4639 min_align (align, BITS_PER_UNIT * (thissize / 2)));
4644 switch (TREE_CODE (exp))
4647 output_constructor (exp, size, align, NULL);
4650 thissize = MIN ((unsigned HOST_WIDE_INT)TREE_STRING_LENGTH (exp),
4652 assemble_string (TREE_STRING_POINTER (exp), thissize);
4659 unsigned int nalign;
4660 enum machine_mode inner;
4662 inner = TYPE_MODE (TREE_TYPE (TREE_TYPE (exp)));
4663 nalign = MIN (align, GET_MODE_ALIGNMENT (inner));
4665 elt_size = GET_MODE_SIZE (inner);
4667 link = TREE_VECTOR_CST_ELTS (exp);
4668 output_constant (TREE_VALUE (link), elt_size, align);
4669 thissize = elt_size;
4670 while ((link = TREE_CHAIN (link)) != NULL)
4672 output_constant (TREE_VALUE (link), elt_size, nalign);
4673 thissize += elt_size;
4684 gcc_assert (TREE_CODE (exp) == CONSTRUCTOR);
4685 output_constructor (exp, size, align, NULL);
4695 if (size > thissize)
4696 assemble_zeros (size - thissize);
4700 /* Subroutine of output_constructor, used for computing the size of
4701 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4702 type with an unspecified upper bound. */
4704 static unsigned HOST_WIDE_INT
4705 array_size_for_constructor (tree val)
4708 unsigned HOST_WIDE_INT cnt;
4709 tree index, value, tmp;
4711 /* This code used to attempt to handle string constants that are not
4712 arrays of single-bytes, but nothing else does, so there's no point in
4714 if (TREE_CODE (val) == STRING_CST)
4715 return TREE_STRING_LENGTH (val);
4717 max_index = NULL_TREE;
4718 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val), cnt, index, value)
4720 if (TREE_CODE (index) == RANGE_EXPR)
4721 index = TREE_OPERAND (index, 1);
4722 if (max_index == NULL_TREE || tree_int_cst_lt (max_index, index))
4726 if (max_index == NULL_TREE)
4729 /* Compute the total number of array elements. */
4730 tmp = TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val)));
4731 i = size_binop (MINUS_EXPR, fold_convert (sizetype, max_index),
4732 fold_convert (sizetype, tmp));
4733 i = size_binop (PLUS_EXPR, i, build_int_cst (sizetype, 1));
4735 /* Multiply by the array element unit size to find number of bytes. */
4736 i = size_binop (MULT_EXPR, i, TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val))));
4738 return tree_low_cst (i, 1);
4741 /* Other datastructures + helpers for output_constructor. */
4743 /* output_constructor local state to support interaction with helpers. */
4747 /* Received arguments. */
4748 tree exp; /* Constructor expression. */
4749 unsigned HOST_WIDE_INT size; /* # bytes to output - pad if necessary. */
4750 unsigned int align; /* Known initial alignment. */
4752 /* Constructor expression data. */
4753 tree type; /* Expression type. */
4754 tree field; /* Current field decl in a record. */
4755 tree min_index; /* Lower bound if specified for an array. */
4757 /* Output processing state. */
4758 HOST_WIDE_INT total_bytes; /* # bytes output so far / current position. */
4759 bool byte_buffer_in_use; /* Whether byte ... */
4760 int byte; /* ... contains part of a bitfield byte yet to
4763 int last_relative_index; /* Implicit or explicit index of the last
4764 array element output within a bitfield. */
4765 /* Current element. */
4766 tree val; /* Current element value. */
4767 tree index; /* Current element index. */
4771 /* Helper for output_constructor. From the current LOCAL state, output a
4772 RANGE_EXPR element. */
4775 output_constructor_array_range (oc_local_state *local)
4777 unsigned HOST_WIDE_INT fieldsize
4778 = int_size_in_bytes (TREE_TYPE (local->type));
4780 HOST_WIDE_INT lo_index
4781 = tree_low_cst (TREE_OPERAND (local->index, 0), 0);
4782 HOST_WIDE_INT hi_index
4783 = tree_low_cst (TREE_OPERAND (local->index, 1), 0);
4784 HOST_WIDE_INT index;
4787 = min_align (local->align, fieldsize * BITS_PER_UNIT);
4789 for (index = lo_index; index <= hi_index; index++)
4791 /* Output the element's initial value. */
4792 if (local->val == NULL_TREE)
4793 assemble_zeros (fieldsize);
4795 output_constant (local->val, fieldsize, align2);
4797 /* Count its size. */
4798 local->total_bytes += fieldsize;
4802 /* Helper for output_constructor. From the current LOCAL state, output a
4803 field element that is not true bitfield or part of an outer one. */
4806 output_constructor_regular_field (oc_local_state *local)
4808 /* Field size and position. Since this structure is static, we know the
4809 positions are constant. */
4810 unsigned HOST_WIDE_INT fieldsize;
4811 HOST_WIDE_INT fieldpos;
4813 unsigned int align2;
4815 if (local->index != NULL_TREE)
4816 fieldpos = (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (local->val)), 1)
4817 * ((tree_low_cst (local->index, 0)
4818 - tree_low_cst (local->min_index, 0))));
4819 else if (local->field != NULL_TREE)
4820 fieldpos = int_byte_position (local->field);
4824 /* Output any buffered-up bit-fields preceding this element. */
4825 if (local->byte_buffer_in_use)
4827 assemble_integer (GEN_INT (local->byte), 1, BITS_PER_UNIT, 1);
4828 local->total_bytes++;
4829 local->byte_buffer_in_use = false;
4832 /* Advance to offset of this element.
4833 Note no alignment needed in an array, since that is guaranteed
4834 if each element has the proper size. */
4835 if ((local->field != NULL_TREE || local->index != NULL_TREE)
4836 && fieldpos != local->total_bytes)
4838 gcc_assert (fieldpos >= local->total_bytes);
4839 assemble_zeros (fieldpos - local->total_bytes);
4840 local->total_bytes = fieldpos;
4843 /* Find the alignment of this element. */
4844 align2 = min_align (local->align, BITS_PER_UNIT * fieldpos);
4846 /* Determine size this element should occupy. */
4851 /* If this is an array with an unspecified upper bound,
4852 the initializer determines the size. */
4853 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4854 but we cannot do this until the deprecated support for
4855 initializing zero-length array members is removed. */
4856 if (TREE_CODE (TREE_TYPE (local->field)) == ARRAY_TYPE
4857 && TYPE_DOMAIN (TREE_TYPE (local->field))
4858 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local->field))))
4860 fieldsize = array_size_for_constructor (local->val);
4861 /* Given a non-empty initialization, this field had
4863 gcc_assert (!fieldsize || !TREE_CHAIN (local->field));
4865 else if (DECL_SIZE_UNIT (local->field))
4867 /* ??? This can't be right. If the decl size overflows
4868 a host integer we will silently emit no data. */
4869 if (host_integerp (DECL_SIZE_UNIT (local->field), 1))
4870 fieldsize = tree_low_cst (DECL_SIZE_UNIT (local->field), 1);
4874 fieldsize = int_size_in_bytes (TREE_TYPE (local->type));
4876 /* Output the element's initial value. */
4877 if (local->val == NULL_TREE)
4878 assemble_zeros (fieldsize);
4880 output_constant (local->val, fieldsize, align2);
4882 /* Count its size. */
4883 local->total_bytes += fieldsize;
4886 /* Helper for output_constructor. From the current LOCAL and OUTER states,
4887 output an element that is a true bitfield or part of an outer one. */
4890 output_constructor_bitfield (oc_local_state *local, oc_outer_state *outer)
4892 /* Bit size of this element. */
4893 HOST_WIDE_INT ebitsize
4895 ? tree_low_cst (DECL_SIZE (local->field), 1)
4896 : tree_low_cst (TYPE_SIZE (TREE_TYPE (local->type)), 1));
4898 /* Relative index of this element if this is an array component. */
4899 HOST_WIDE_INT relative_index
4902 ? (tree_low_cst (local->index, 0)
4903 - tree_low_cst (local->min_index, 0))
4904 : local->last_relative_index + 1)
4907 /* Bit position of this element from the start of the containing
4909 HOST_WIDE_INT constructor_relative_ebitpos
4911 ? int_bit_position (local->field)
4912 : ebitsize * relative_index);
4914 /* Bit position of this element from the start of a possibly ongoing
4915 outer byte buffer. */
4916 HOST_WIDE_INT byte_relative_ebitpos
4917 = ((outer ? outer->bit_offset : 0) + constructor_relative_ebitpos);
4919 /* From the start of a possibly ongoing outer byte buffer, offsets to
4920 the first bit of this element and to the first bit past the end of
4922 HOST_WIDE_INT next_offset = byte_relative_ebitpos;
4923 HOST_WIDE_INT end_offset = byte_relative_ebitpos + ebitsize;
4925 local->last_relative_index = relative_index;
4927 if (local->val == NULL_TREE)
4928 local->val = integer_zero_node;
4930 while (TREE_CODE (local->val) == VIEW_CONVERT_EXPR
4931 || TREE_CODE (local->val) == NON_LVALUE_EXPR)
4932 local->val = TREE_OPERAND (local->val, 0);
4934 if (TREE_CODE (local->val) != INTEGER_CST
4935 && TREE_CODE (local->val) != CONSTRUCTOR)
4937 error ("invalid initial value for member %qE", DECL_NAME (local->field));
4941 /* If this field does not start in this (or, next) byte,
4943 if (next_offset / BITS_PER_UNIT != local->total_bytes)
4945 /* Output remnant of any bit field in previous bytes. */
4946 if (local->byte_buffer_in_use)
4948 assemble_integer (GEN_INT (local->byte), 1, BITS_PER_UNIT, 1);
4949 local->total_bytes++;
4950 local->byte_buffer_in_use = false;
4953 /* If still not at proper byte, advance to there. */
4954 if (next_offset / BITS_PER_UNIT != local->total_bytes)
4956 gcc_assert (next_offset / BITS_PER_UNIT >= local->total_bytes);
4957 assemble_zeros (next_offset / BITS_PER_UNIT - local->total_bytes);
4958 local->total_bytes = next_offset / BITS_PER_UNIT;
4962 /* Set up the buffer if necessary. */
4963 if (!local->byte_buffer_in_use)
4967 local->byte_buffer_in_use = true;
4970 /* If this is nested constructor, recurse passing the bit offset and the
4971 pending data, then retrieve the new pending data afterwards. */
4972 if (TREE_CODE (local->val) == CONSTRUCTOR)
4974 oc_outer_state output_state;
4976 output_state.bit_offset = next_offset % BITS_PER_UNIT;
4977 output_state.byte = local->byte;
4979 += output_constructor (local->val, 0, 0, &output_state);
4980 local->byte = output_state.byte;
4984 /* Otherwise, we must split the element into pieces that fall within
4985 separate bytes, and combine each byte with previous or following
4987 while (next_offset < end_offset)
4991 HOST_WIDE_INT value;
4992 HOST_WIDE_INT next_byte = next_offset / BITS_PER_UNIT;
4993 HOST_WIDE_INT next_bit = next_offset % BITS_PER_UNIT;
4995 /* Advance from byte to byte
4996 within this element when necessary. */
4997 while (next_byte != local->total_bytes)
4999 assemble_integer (GEN_INT (local->byte), 1, BITS_PER_UNIT, 1);
5000 local->total_bytes++;
5004 /* Number of bits we can process at once
5005 (all part of the same byte). */
5006 this_time = MIN (end_offset - next_offset,
5007 BITS_PER_UNIT - next_bit);
5008 if (BYTES_BIG_ENDIAN)
5010 /* On big-endian machine, take the most significant bits
5011 first (of the bits that are significant)
5012 and put them into bytes from the most significant end. */
5013 shift = end_offset - next_offset - this_time;
5015 /* Don't try to take a bunch of bits that cross
5016 the word boundary in the INTEGER_CST. We can
5017 only select bits from the LOW or HIGH part
5019 if (shift < HOST_BITS_PER_WIDE_INT
5020 && shift + this_time > HOST_BITS_PER_WIDE_INT)
5022 this_time = shift + this_time - HOST_BITS_PER_WIDE_INT;
5023 shift = HOST_BITS_PER_WIDE_INT;
5026 /* Now get the bits from the appropriate constant word. */
5027 if (shift < HOST_BITS_PER_WIDE_INT)
5028 value = TREE_INT_CST_LOW (local->val);
5031 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
5032 value = TREE_INT_CST_HIGH (local->val);
5033 shift -= HOST_BITS_PER_WIDE_INT;
5036 /* Get the result. This works only when:
5037 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5038 local->byte |= (((value >> shift)
5039 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
5040 << (BITS_PER_UNIT - this_time - next_bit));
5044 /* On little-endian machines,
5045 take first the least significant bits of the value
5046 and pack them starting at the least significant
5047 bits of the bytes. */
5048 shift = next_offset - byte_relative_ebitpos;
5050 /* Don't try to take a bunch of bits that cross
5051 the word boundary in the INTEGER_CST. We can
5052 only select bits from the LOW or HIGH part
5054 if (shift < HOST_BITS_PER_WIDE_INT
5055 && shift + this_time > HOST_BITS_PER_WIDE_INT)
5056 this_time = (HOST_BITS_PER_WIDE_INT - shift);
5058 /* Now get the bits from the appropriate constant word. */
5059 if (shift < HOST_BITS_PER_WIDE_INT)
5060 value = TREE_INT_CST_LOW (local->val);
5063 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
5064 value = TREE_INT_CST_HIGH (local->val);
5065 shift -= HOST_BITS_PER_WIDE_INT;
5068 /* Get the result. This works only when:
5069 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5070 local->byte |= (((value >> shift)
5071 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
5075 next_offset += this_time;
5076 local->byte_buffer_in_use = true;
5080 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5081 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5082 caller output state of relevance in recursive invocations. */
5084 static unsigned HOST_WIDE_INT
5085 output_constructor (tree exp, unsigned HOST_WIDE_INT size,
5086 unsigned int align, oc_outer_state * outer)
5088 unsigned HOST_WIDE_INT cnt;
5089 constructor_elt *ce;
5091 oc_local_state local;
5093 /* Setup our local state to communicate with helpers. */
5096 local.align = align;
5098 local.total_bytes = 0;
5099 local.byte_buffer_in_use = outer != NULL;
5100 local.byte = outer ? outer->byte : 0;
5102 local.type = TREE_TYPE (exp);
5104 local.last_relative_index = -1;
5106 local.min_index = NULL_TREE;
5107 if (TREE_CODE (local.type) == ARRAY_TYPE
5108 && TYPE_DOMAIN (local.type) != NULL_TREE)
5109 local.min_index = TYPE_MIN_VALUE (TYPE_DOMAIN (local.type));
5111 gcc_assert (HOST_BITS_PER_WIDE_INT >= BITS_PER_UNIT);
5113 /* As CE goes through the elements of the constant, FIELD goes through the
5114 structure fields if the constant is a structure. If the constant is a
5115 union, we override this by getting the field from the TREE_LIST element.
5116 But the constant could also be an array. Then FIELD is zero.
5118 There is always a maximum of one element in the chain LINK for unions
5119 (even if the initializer in a source program incorrectly contains
5122 local.field = NULL_TREE;
5123 if (TREE_CODE (local.type) == RECORD_TYPE)
5124 local.field = TYPE_FIELDS (local.type);
5127 VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (exp), cnt, ce);
5128 cnt++, local.field = local.field ? TREE_CHAIN (local.field) : 0)
5130 local.val = ce->value;
5131 local.index = NULL_TREE;
5133 /* The element in a union constructor specifies the proper field
5135 if ((TREE_CODE (local.type) == RECORD_TYPE
5136 || TREE_CODE (local.type) == UNION_TYPE
5137 || TREE_CODE (local.type) == QUAL_UNION_TYPE)
5138 && ce->index != NULL_TREE)
5139 local.field = ce->index;
5141 else if (TREE_CODE (local.type) == ARRAY_TYPE)
5142 local.index = ce->index;
5144 #ifdef ASM_COMMENT_START
5145 if (local.field && flag_verbose_asm)
5146 fprintf (asm_out_file, "%s %s:\n",
5148 DECL_NAME (local.field)
5149 ? IDENTIFIER_POINTER (DECL_NAME (local.field))
5153 /* Eliminate the marker that makes a cast not be an lvalue. */
5154 if (local.val != NULL_TREE)
5155 STRIP_NOPS (local.val);
5157 /* Output the current element, using the appropriate helper ... */
5159 /* For an array slice not part of an outer bitfield. */
5161 && local.index != NULL_TREE
5162 && TREE_CODE (local.index) == RANGE_EXPR)
5163 output_constructor_array_range (&local);
5165 /* For a field that is neither a true bitfield nor part of an outer one,
5166 known to be at least byte aligned and multiple-of-bytes long. */
5168 && (local.field == NULL_TREE
5169 || !CONSTRUCTOR_BITFIELD_P (local.field)))
5170 output_constructor_regular_field (&local);
5172 /* For a true bitfield or part of an outer one. */
5174 output_constructor_bitfield (&local, outer);
5177 /* If we are not at toplevel, save the pending data for our caller.
5178 Otherwise output the pending data and padding zeros as needed. */
5180 outer->byte = local.byte;
5183 if (local.byte_buffer_in_use)
5185 assemble_integer (GEN_INT (local.byte), 1, BITS_PER_UNIT, 1);
5186 local.total_bytes++;
5189 if ((unsigned HOST_WIDE_INT)local.total_bytes < local.size)
5191 assemble_zeros (local.size - local.total_bytes);
5192 local.total_bytes = local.size;
5196 return local.total_bytes;
5199 /* Mark DECL as weak. */
5202 mark_weak (tree decl)
5204 DECL_WEAK (decl) = 1;
5206 if (DECL_RTL_SET_P (decl)
5207 && MEM_P (DECL_RTL (decl))
5208 && XEXP (DECL_RTL (decl), 0)
5209 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == SYMBOL_REF)
5210 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl), 0)) = 1;
5213 /* Merge weak status between NEWDECL and OLDDECL. */
5216 merge_weak (tree newdecl, tree olddecl)
5218 if (DECL_WEAK (newdecl) == DECL_WEAK (olddecl))
5220 if (DECL_WEAK (newdecl) && SUPPORTS_WEAK)
5223 /* We put the NEWDECL on the weak_decls list at some point
5224 and OLDDECL as well. Keep just OLDDECL on the list. */
5225 for (pwd = &weak_decls; *pwd; pwd = &TREE_CHAIN (*pwd))
5226 if (TREE_VALUE (*pwd) == newdecl)
5228 *pwd = TREE_CHAIN (*pwd);
5235 if (DECL_WEAK (newdecl))
5239 /* NEWDECL is weak, but OLDDECL is not. */
5241 /* If we already output the OLDDECL, we're in trouble; we can't
5242 go back and make it weak. This error cannot be caught in
5243 declare_weak because the NEWDECL and OLDDECL was not yet
5244 been merged; therefore, TREE_ASM_WRITTEN was not set. */
5245 if (TREE_ASM_WRITTEN (olddecl))
5246 error ("weak declaration of %q+D must precede definition",
5249 /* If we've already generated rtl referencing OLDDECL, we may
5250 have done so in a way that will not function properly with
5252 else if (TREE_USED (olddecl)
5253 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl)))
5254 warning (0, "weak declaration of %q+D after first use results "
5255 "in unspecified behavior", newdecl);
5259 /* We put the NEWDECL on the weak_decls list at some point.
5260 Replace it with the OLDDECL. */
5261 for (wd = weak_decls; wd; wd = TREE_CHAIN (wd))
5262 if (TREE_VALUE (wd) == newdecl)
5264 TREE_VALUE (wd) = olddecl;
5267 /* We may not find the entry on the list. If NEWDECL is a
5268 weak alias, then we will have already called
5269 globalize_decl to remove the entry; in that case, we do
5270 not need to do anything. */
5273 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5274 mark_weak (olddecl);
5277 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5278 weak. Just update NEWDECL to indicate that it's weak too. */
5279 mark_weak (newdecl);
5282 /* Declare DECL to be a weak symbol. */
5285 declare_weak (tree decl)
5287 if (! TREE_PUBLIC (decl))
5288 error ("weak declaration of %q+D must be public", decl);
5289 else if (TREE_CODE (decl) == FUNCTION_DECL && TREE_ASM_WRITTEN (decl))
5290 error ("weak declaration of %q+D must precede definition", decl);
5291 else if (!SUPPORTS_WEAK)
5292 warning (0, "weak declaration of %q+D not supported", decl);
5295 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl)))
5296 DECL_ATTRIBUTES (decl)
5297 = tree_cons (get_identifier ("weak"), NULL, DECL_ATTRIBUTES (decl));
5301 weak_finish_1 (tree decl)
5303 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5304 const char *const name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5307 if (! TREE_USED (decl))
5310 #ifdef ASM_WEAKEN_DECL
5311 ASM_WEAKEN_DECL (asm_out_file, decl, name, NULL);
5313 #ifdef ASM_WEAKEN_LABEL
5314 ASM_WEAKEN_LABEL (asm_out_file, name);
5316 #ifdef ASM_OUTPUT_WEAK_ALIAS
5318 static bool warn_once = 0;
5321 warning (0, "only weak aliases are supported in this configuration");
5331 /* This TREE_LIST contains weakref targets. */
5333 static GTY(()) tree weakref_targets;
5335 /* Forward declaration. */
5336 static tree find_decl_and_mark_needed (tree decl, tree target);
5338 /* Emit any pending weak declarations. */
5345 for (t = weakref_targets; t; t = TREE_CHAIN (t))
5347 tree alias_decl = TREE_PURPOSE (t);
5348 tree target = ultimate_transparent_alias_target (&TREE_VALUE (t));
5350 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl)))
5351 /* Remove alias_decl from the weak list, but leave entries for
5352 the target alone. */
5354 #ifndef ASM_OUTPUT_WEAKREF
5355 else if (! TREE_SYMBOL_REFERENCED (target))
5357 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5358 defined, otherwise we and weak_finish_1 would use
5359 different macros. */
5360 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5361 ASM_WEAKEN_LABEL (asm_out_file, IDENTIFIER_POINTER (target));
5363 tree decl = find_decl_and_mark_needed (alias_decl, target);
5367 decl = build_decl (DECL_SOURCE_LOCATION (alias_decl),
5368 TREE_CODE (alias_decl), target,
5369 TREE_TYPE (alias_decl));
5371 DECL_EXTERNAL (decl) = 1;
5372 TREE_PUBLIC (decl) = 1;
5373 DECL_ARTIFICIAL (decl) = 1;
5374 TREE_NOTHROW (decl) = TREE_NOTHROW (alias_decl);
5375 TREE_USED (decl) = 1;
5378 weak_finish_1 (decl);
5387 /* Remove the alias and the target from the pending weak list
5388 so that we do not emit any .weak directives for the former,
5389 nor multiple .weak directives for the latter. */
5390 for (p = &weak_decls; (t2 = *p) ; )
5392 if (TREE_VALUE (t2) == alias_decl
5393 || target == DECL_ASSEMBLER_NAME (TREE_VALUE (t2)))
5394 *p = TREE_CHAIN (t2);
5396 p = &TREE_CHAIN (t2);
5399 /* Remove other weakrefs to the same target, to speed things up. */
5400 for (p = &TREE_CHAIN (t); (t2 = *p) ; )
5402 if (target == ultimate_transparent_alias_target (&TREE_VALUE (t2)))
5403 *p = TREE_CHAIN (t2);
5405 p = &TREE_CHAIN (t2);
5410 for (t = weak_decls; t; t = TREE_CHAIN (t))
5412 tree decl = TREE_VALUE (t);
5414 weak_finish_1 (decl);
5418 /* Emit the assembly bits to indicate that DECL is globally visible. */
5421 globalize_decl (tree decl)
5424 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5425 if (DECL_WEAK (decl))
5427 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
5430 #ifdef ASM_WEAKEN_DECL
5431 ASM_WEAKEN_DECL (asm_out_file, decl, name, 0);
5433 ASM_WEAKEN_LABEL (asm_out_file, name);
5436 /* Remove this function from the pending weak list so that
5437 we do not emit multiple .weak directives for it. */
5438 for (p = &weak_decls; (t = *p) ; )
5440 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
5441 *p = TREE_CHAIN (t);
5443 p = &TREE_CHAIN (t);
5446 /* Remove weakrefs to the same target from the pending weakref
5447 list, for the same reason. */
5448 for (p = &weakref_targets; (t = *p) ; )
5450 if (DECL_ASSEMBLER_NAME (decl)
5451 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
5452 *p = TREE_CHAIN (t);
5454 p = &TREE_CHAIN (t);
5461 targetm.asm_out.globalize_decl_name (asm_out_file, decl);
5464 VEC(alias_pair,gc) *alias_pairs;
5466 /* Given an assembly name, find the decl it is associated with. At the
5467 same time, mark it needed for cgraph. */
5470 find_decl_and_mark_needed (tree decl, tree target)
5472 struct cgraph_node *fnode = NULL;
5473 struct varpool_node *vnode = NULL;
5475 if (TREE_CODE (decl) == FUNCTION_DECL)
5477 fnode = cgraph_node_for_asm (target);
5479 vnode = varpool_node_for_asm (target);
5483 vnode = varpool_node_for_asm (target);
5485 fnode = cgraph_node_for_asm (target);
5490 cgraph_mark_needed_node (fnode);
5495 varpool_mark_needed_node (vnode);
5502 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5503 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5504 tree node is DECL to have the value of the tree node TARGET. */
5507 do_assemble_alias (tree decl, tree target)
5509 if (TREE_ASM_WRITTEN (decl))
5512 /* We must force creation of DECL_RTL for debug info generation, even though
5513 we don't use it here. */
5514 make_decl_rtl (decl);
5516 TREE_ASM_WRITTEN (decl) = 1;
5517 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl)) = 1;
5519 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
5521 ultimate_transparent_alias_target (&target);
5523 if (!targetm.have_tls
5524 && TREE_CODE (decl) == VAR_DECL
5525 && DECL_THREAD_LOCAL_P (decl))
5527 decl = emutls_decl (decl);
5528 target = get_emutls_object_name (target);
5531 if (!TREE_SYMBOL_REFERENCED (target))
5532 weakref_targets = tree_cons (decl, target, weakref_targets);
5534 #ifdef ASM_OUTPUT_WEAKREF
5535 ASM_OUTPUT_WEAKREF (asm_out_file, decl,
5536 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
5537 IDENTIFIER_POINTER (target));
5541 error_at (DECL_SOURCE_LOCATION (decl),
5542 "weakref is not supported in this configuration");
5549 if (!targetm.have_tls
5550 && TREE_CODE (decl) == VAR_DECL
5551 && DECL_THREAD_LOCAL_P (decl))
5553 decl = emutls_decl (decl);
5554 target = get_emutls_object_name (target);
5557 #ifdef ASM_OUTPUT_DEF
5558 /* Make name accessible from other files, if appropriate. */
5560 if (TREE_PUBLIC (decl))
5562 globalize_decl (decl);
5563 maybe_assemble_visibility (decl);
5566 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5567 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file, decl, target);
5569 ASM_OUTPUT_DEF (asm_out_file,
5570 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
5571 IDENTIFIER_POINTER (target));
5573 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5578 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5579 # ifdef ASM_WEAKEN_DECL
5580 ASM_WEAKEN_DECL (asm_out_file, decl, name, IDENTIFIER_POINTER (target));
5582 ASM_OUTPUT_WEAK_ALIAS (asm_out_file, name, IDENTIFIER_POINTER (target));
5584 /* Remove this function from the pending weak list so that
5585 we do not emit multiple .weak directives for it. */
5586 for (p = &weak_decls; (t = *p) ; )
5587 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
5588 *p = TREE_CHAIN (t);
5590 p = &TREE_CHAIN (t);
5592 /* Remove weakrefs to the same target from the pending weakref
5593 list, for the same reason. */
5594 for (p = &weakref_targets; (t = *p) ; )
5596 if (DECL_ASSEMBLER_NAME (decl)
5597 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
5598 *p = TREE_CHAIN (t);
5600 p = &TREE_CHAIN (t);
5607 /* Remove the alias pairing for functions that are no longer in the call
5611 remove_unreachable_alias_pairs (void)
5616 if (alias_pairs == NULL)
5619 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); )
5621 if (!DECL_EXTERNAL (p->decl))
5623 struct cgraph_node *fnode = NULL;
5624 struct varpool_node *vnode = NULL;
5625 fnode = cgraph_node_for_asm (p->target);
5626 vnode = (fnode == NULL) ? varpool_node_for_asm (p->target) : NULL;
5627 if (fnode == NULL && vnode == NULL)
5629 VEC_unordered_remove (alias_pair, alias_pairs, i);
5639 /* First pass of completing pending aliases. Make sure that cgraph knows
5640 which symbols will be required. */
5643 finish_aliases_1 (void)
5648 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); i++)
5652 target_decl = find_decl_and_mark_needed (p->decl, p->target);
5653 if (target_decl == NULL)
5655 if (! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
5656 error ("%q+D aliased to undefined symbol %qE",
5657 p->decl, p->target);
5659 else if (DECL_EXTERNAL (target_decl)
5660 /* We use local aliases for C++ thunks to force the tailcall
5661 to bind locally. Of course this is a hack - to keep it
5662 working do the following (which is not strictly correct). */
5663 && (! TREE_CODE (target_decl) == FUNCTION_DECL
5664 || ! DECL_VIRTUAL_P (target_decl))
5665 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
5666 error ("%q+D aliased to external symbol %qE",
5667 p->decl, p->target);
5671 /* Second pass of completing pending aliases. Emit the actual assembly.
5672 This happens at the end of compilation and thus it is assured that the
5673 target symbol has been emitted. */
5676 finish_aliases_2 (void)
5681 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); i++)
5682 do_assemble_alias (p->decl, p->target);
5684 VEC_truncate (alias_pair, alias_pairs, 0);
5687 /* Emit an assembler directive to make the symbol for DECL an alias to
5688 the symbol for TARGET. */
5691 assemble_alias (tree decl, tree target)
5694 bool is_weakref = false;
5696 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
5698 tree alias = DECL_ASSEMBLER_NAME (decl);
5702 ultimate_transparent_alias_target (&target);
5704 if (alias == target)
5705 error ("weakref %q+D ultimately targets itself", decl);
5708 #ifndef ASM_OUTPUT_WEAKREF
5709 IDENTIFIER_TRANSPARENT_ALIAS (alias) = 1;
5710 TREE_CHAIN (alias) = target;
5713 if (TREE_PUBLIC (decl))
5714 error ("weakref %q+D must have static linkage", decl);
5718 #if !defined (ASM_OUTPUT_DEF)
5719 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5720 error_at (DECL_SOURCE_LOCATION (decl),
5721 "alias definitions not supported in this configuration");
5724 if (!DECL_WEAK (decl))
5726 error_at (DECL_SOURCE_LOCATION (decl),
5727 "only weak aliases are supported in this configuration");
5733 TREE_USED (decl) = 1;
5735 /* A quirk of the initial implementation of aliases required that the user
5736 add "extern" to all of them. Which is silly, but now historical. Do
5737 note that the symbol is in fact locally defined. */
5739 DECL_EXTERNAL (decl) = 0;
5741 /* Allow aliases to aliases. */
5742 if (TREE_CODE (decl) == FUNCTION_DECL)
5743 cgraph_node (decl)->alias = true;
5745 varpool_node (decl)->alias = true;
5747 /* If the target has already been emitted, we don't have to queue the
5748 alias. This saves a tad of memory. */
5749 if (cgraph_global_info_ready)
5750 target_decl = find_decl_and_mark_needed (decl, target);
5753 if (target_decl && TREE_ASM_WRITTEN (target_decl))
5754 do_assemble_alias (decl, target);
5757 alias_pair *p = VEC_safe_push (alias_pair, gc, alias_pairs, NULL);
5763 /* Emit an assembler directive to set symbol for DECL visibility to
5764 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5767 default_assemble_visibility (tree decl, int vis)
5769 static const char * const visibility_types[] = {
5770 NULL, "protected", "hidden", "internal"
5773 const char *name, *type;
5775 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5776 type = visibility_types[vis];
5778 #ifdef HAVE_GAS_HIDDEN
5779 fprintf (asm_out_file, "\t.%s\t", type);
5780 assemble_name (asm_out_file, name);
5781 fprintf (asm_out_file, "\n");
5783 warning (OPT_Wattributes, "visibility attribute not supported "
5784 "in this configuration; ignored");
5788 /* A helper function to call assemble_visibility when needed for a decl. */
5791 maybe_assemble_visibility (tree decl)
5793 enum symbol_visibility vis = DECL_VISIBILITY (decl);
5795 if (vis != VISIBILITY_DEFAULT)
5797 targetm.asm_out.visibility (decl, vis);
5804 /* Returns 1 if the target configuration supports defining public symbols
5805 so that one of them will be chosen at link time instead of generating a
5806 multiply-defined symbol error, whether through the use of weak symbols or
5807 a target-specific mechanism for having duplicates discarded. */
5810 supports_one_only (void)
5812 if (SUPPORTS_ONE_ONLY)
5814 return SUPPORTS_WEAK;
5817 /* Set up DECL as a public symbol that can be defined in multiple
5818 translation units without generating a linker error. */
5821 make_decl_one_only (tree decl, tree comdat_group)
5823 gcc_assert (TREE_CODE (decl) == VAR_DECL
5824 || TREE_CODE (decl) == FUNCTION_DECL);
5826 TREE_PUBLIC (decl) = 1;
5828 if (SUPPORTS_ONE_ONLY)
5830 #ifdef MAKE_DECL_ONE_ONLY
5831 MAKE_DECL_ONE_ONLY (decl);
5833 DECL_COMDAT_GROUP (decl) = comdat_group;
5835 else if (TREE_CODE (decl) == VAR_DECL
5836 && (DECL_INITIAL (decl) == 0 || DECL_INITIAL (decl) == error_mark_node))
5837 DECL_COMMON (decl) = 1;
5840 gcc_assert (SUPPORTS_WEAK);
5841 DECL_WEAK (decl) = 1;
5846 init_varasm_once (void)
5848 section_htab = htab_create_ggc (31, section_entry_hash,
5849 section_entry_eq, NULL);
5850 object_block_htab = htab_create_ggc (31, object_block_entry_hash,
5851 object_block_entry_eq, NULL);
5852 const_desc_htab = htab_create_ggc (1009, const_desc_hash,
5853 const_desc_eq, NULL);
5855 const_alias_set = new_alias_set ();
5856 shared_constant_pool = create_constant_pool ();
5858 #ifdef TEXT_SECTION_ASM_OP
5859 text_section = get_unnamed_section (SECTION_CODE, output_section_asm_op,
5860 TEXT_SECTION_ASM_OP);
5863 #ifdef DATA_SECTION_ASM_OP
5864 data_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
5865 DATA_SECTION_ASM_OP);
5868 #ifdef SDATA_SECTION_ASM_OP
5869 sdata_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
5870 SDATA_SECTION_ASM_OP);
5873 #ifdef READONLY_DATA_SECTION_ASM_OP
5874 readonly_data_section = get_unnamed_section (0, output_section_asm_op,
5875 READONLY_DATA_SECTION_ASM_OP);
5878 #ifdef CTORS_SECTION_ASM_OP
5879 ctors_section = get_unnamed_section (0, output_section_asm_op,
5880 CTORS_SECTION_ASM_OP);
5883 #ifdef DTORS_SECTION_ASM_OP
5884 dtors_section = get_unnamed_section (0, output_section_asm_op,
5885 DTORS_SECTION_ASM_OP);
5888 #ifdef BSS_SECTION_ASM_OP
5889 bss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
5890 output_section_asm_op,
5891 BSS_SECTION_ASM_OP);
5894 #ifdef SBSS_SECTION_ASM_OP
5895 sbss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
5896 output_section_asm_op,
5897 SBSS_SECTION_ASM_OP);
5900 tls_comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5901 | SECTION_COMMON, emit_tls_common);
5902 lcomm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5903 | SECTION_COMMON, emit_local);
5904 comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5905 | SECTION_COMMON, emit_common);
5907 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
5908 bss_noswitch_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS,
5912 targetm.asm_out.init_sections ();
5914 if (readonly_data_section == NULL)
5915 readonly_data_section = text_section;
5919 decl_default_tls_model (const_tree decl)
5921 enum tls_model kind;
5924 is_local = targetm.binds_local_p (decl);
5928 kind = TLS_MODEL_LOCAL_EXEC;
5930 kind = TLS_MODEL_INITIAL_EXEC;
5933 /* Local dynamic is inefficient when we're not combining the
5934 parts of the address. */
5935 else if (optimize && is_local)
5936 kind = TLS_MODEL_LOCAL_DYNAMIC;
5938 kind = TLS_MODEL_GLOBAL_DYNAMIC;
5939 if (kind < flag_tls_default)
5940 kind = flag_tls_default;
5945 /* Select a set of attributes for section NAME based on the properties
5946 of DECL and whether or not RELOC indicates that DECL's initializer
5947 might contain runtime relocations.
5949 We make the section read-only and executable for a function decl,
5950 read-only for a const data decl, and writable for a non-const data decl. */
5953 default_section_type_flags (tree decl, const char *name, int reloc)
5957 if (decl && TREE_CODE (decl) == FUNCTION_DECL)
5958 flags = SECTION_CODE;
5959 else if (decl && decl_readonly_section (decl, reloc))
5961 else if (current_function_decl
5963 && crtl->subsections.unlikely_text_section_name
5964 && strcmp (name, crtl->subsections.unlikely_text_section_name) == 0)
5965 flags = SECTION_CODE;
5967 && (!current_function_decl || !cfun)
5968 && strcmp (name, UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
5969 flags = SECTION_CODE;
5971 flags = SECTION_WRITE;
5973 if (decl && DECL_ONE_ONLY (decl))
5974 flags |= SECTION_LINKONCE;
5976 if (decl && TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
5977 flags |= SECTION_TLS | SECTION_WRITE;
5979 if (strcmp (name, ".bss") == 0
5980 || strncmp (name, ".bss.", 5) == 0
5981 || strncmp (name, ".gnu.linkonce.b.", 16) == 0
5982 || strcmp (name, ".sbss") == 0
5983 || strncmp (name, ".sbss.", 6) == 0
5984 || strncmp (name, ".gnu.linkonce.sb.", 17) == 0)
5985 flags |= SECTION_BSS;
5987 if (strcmp (name, ".tdata") == 0
5988 || strncmp (name, ".tdata.", 7) == 0
5989 || strncmp (name, ".gnu.linkonce.td.", 17) == 0)
5990 flags |= SECTION_TLS;
5992 if (strcmp (name, ".tbss") == 0
5993 || strncmp (name, ".tbss.", 6) == 0
5994 || strncmp (name, ".gnu.linkonce.tb.", 17) == 0)
5995 flags |= SECTION_TLS | SECTION_BSS;
5997 /* These three sections have special ELF types. They are neither
5998 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
5999 want to print a section type (@progbits or @nobits). If someone
6000 is silly enough to emit code or TLS variables to one of these
6001 sections, then don't handle them specially. */
6002 if (!(flags & (SECTION_CODE | SECTION_BSS | SECTION_TLS))
6003 && (strcmp (name, ".init_array") == 0
6004 || strcmp (name, ".fini_array") == 0
6005 || strcmp (name, ".preinit_array") == 0))
6006 flags |= SECTION_NOTYPE;
6011 /* Return true if the target supports some form of global BSS,
6012 either through bss_noswitch_section, or by selecting a BSS
6013 section in TARGET_ASM_SELECT_SECTION. */
6016 have_global_bss_p (void)
6018 return bss_noswitch_section || targetm.have_switchable_bss_sections;
6021 /* Output assembly to switch to section NAME with attribute FLAGS.
6022 Four variants for common object file formats. */
6025 default_no_named_section (const char *name ATTRIBUTE_UNUSED,
6026 unsigned int flags ATTRIBUTE_UNUSED,
6027 tree decl ATTRIBUTE_UNUSED)
6029 /* Some object formats don't support named sections at all. The
6030 front-end should already have flagged this as an error. */
6035 default_elf_asm_named_section (const char *name, unsigned int flags,
6036 tree decl ATTRIBUTE_UNUSED)
6038 char flagchars[10], *f = flagchars;
6040 /* If we have already declared this section, we can use an
6041 abbreviated form to switch back to it -- unless this section is
6042 part of a COMDAT groups, in which case GAS requires the full
6043 declaration every time. */
6044 if (!(HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
6045 && (flags & SECTION_DECLARED))
6047 fprintf (asm_out_file, "\t.section\t%s\n", name);
6051 if (!(flags & SECTION_DEBUG))
6053 if (flags & SECTION_WRITE)
6055 if (flags & SECTION_CODE)
6057 if (flags & SECTION_SMALL)
6059 if (flags & SECTION_MERGE)
6061 if (flags & SECTION_STRINGS)
6063 if (flags & SECTION_TLS)
6065 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
6069 fprintf (asm_out_file, "\t.section\t%s,\"%s\"", name, flagchars);
6071 if (!(flags & SECTION_NOTYPE))
6076 if (flags & SECTION_BSS)
6082 #ifdef ASM_COMMENT_START
6083 /* On platforms that use "@" as the assembly comment character,
6085 if (strcmp (ASM_COMMENT_START, "@") == 0)
6088 fprintf (asm_out_file, format, type);
6090 if (flags & SECTION_ENTSIZE)
6091 fprintf (asm_out_file, ",%d", flags & SECTION_ENTSIZE);
6092 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
6094 if (TREE_CODE (decl) == IDENTIFIER_NODE)
6095 fprintf (asm_out_file, ",%s,comdat", IDENTIFIER_POINTER (decl));
6097 fprintf (asm_out_file, ",%s,comdat",
6098 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl)));
6102 putc ('\n', asm_out_file);
6106 default_coff_asm_named_section (const char *name, unsigned int flags,
6107 tree decl ATTRIBUTE_UNUSED)
6109 char flagchars[8], *f = flagchars;
6111 if (flags & SECTION_WRITE)
6113 if (flags & SECTION_CODE)
6117 fprintf (asm_out_file, "\t.section\t%s,\"%s\"\n", name, flagchars);
6121 default_pe_asm_named_section (const char *name, unsigned int flags,
6124 default_coff_asm_named_section (name, flags, decl);
6126 if (flags & SECTION_LINKONCE)
6128 /* Functions may have been compiled at various levels of
6129 optimization so we can't use `same_size' here.
6130 Instead, have the linker pick one. */
6131 fprintf (asm_out_file, "\t.linkonce %s\n",
6132 (flags & SECTION_CODE ? "discard" : "same_size"));
6136 /* The lame default section selector. */
6139 default_select_section (tree decl, int reloc,
6140 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
6144 if (decl_readonly_section (decl, reloc))
6145 return readonly_data_section;
6147 else if (TREE_CODE (decl) == CONSTRUCTOR)
6149 if (! ((flag_pic && reloc)
6150 || !TREE_READONLY (decl)
6151 || TREE_SIDE_EFFECTS (decl)
6152 || !TREE_CONSTANT (decl)))
6153 return readonly_data_section;
6155 else if (TREE_CODE (decl) == STRING_CST)
6156 return readonly_data_section;
6157 else if (! (flag_pic && reloc))
6158 return readonly_data_section;
6160 return data_section;
6163 enum section_category
6164 categorize_decl_for_section (const_tree decl, int reloc)
6166 enum section_category ret;
6168 if (TREE_CODE (decl) == FUNCTION_DECL)
6170 else if (TREE_CODE (decl) == STRING_CST)
6172 if (flag_mudflap) /* or !flag_merge_constants */
6173 return SECCAT_RODATA;
6175 return SECCAT_RODATA_MERGE_STR;
6177 else if (TREE_CODE (decl) == VAR_DECL)
6179 if (bss_initializer_p (decl))
6181 else if (! TREE_READONLY (decl)
6182 || TREE_SIDE_EFFECTS (decl)
6183 || ! TREE_CONSTANT (DECL_INITIAL (decl)))
6185 /* Here the reloc_rw_mask is not testing whether the section should
6186 be read-only or not, but whether the dynamic link will have to
6187 do something. If so, we wish to segregate the data in order to
6188 minimize cache misses inside the dynamic linker. */
6189 if (reloc & targetm.asm_out.reloc_rw_mask ())
6190 ret = reloc == 1 ? SECCAT_DATA_REL_LOCAL : SECCAT_DATA_REL;
6194 else if (reloc & targetm.asm_out.reloc_rw_mask ())
6195 ret = reloc == 1 ? SECCAT_DATA_REL_RO_LOCAL : SECCAT_DATA_REL_RO;
6196 else if (reloc || flag_merge_constants < 2)
6197 /* C and C++ don't allow different variables to share the same
6198 location. -fmerge-all-constants allows even that (at the
6199 expense of not conforming). */
6200 ret = SECCAT_RODATA;
6201 else if (TREE_CODE (DECL_INITIAL (decl)) == STRING_CST)
6202 ret = SECCAT_RODATA_MERGE_STR_INIT;
6204 ret = SECCAT_RODATA_MERGE_CONST;
6206 else if (TREE_CODE (decl) == CONSTRUCTOR)
6208 if ((reloc & targetm.asm_out.reloc_rw_mask ())
6209 || TREE_SIDE_EFFECTS (decl)
6210 || ! TREE_CONSTANT (decl))
6213 ret = SECCAT_RODATA;
6216 ret = SECCAT_RODATA;
6218 /* There are no read-only thread-local sections. */
6219 if (TREE_CODE (decl) == VAR_DECL && DECL_TLS_MODEL (decl))
6221 if (DECL_TLS_MODEL (decl) == TLS_MODEL_EMULATED)
6223 if (DECL_EMUTLS_VAR_P (decl))
6225 if (targetm.emutls.var_section)
6226 ret = SECCAT_EMUTLS_VAR;
6230 if (targetm.emutls.tmpl_prefix)
6231 ret = SECCAT_EMUTLS_TMPL;
6234 /* Note that this would be *just* SECCAT_BSS, except that there's
6235 no concept of a read-only thread-local-data section. */
6236 else if (ret == SECCAT_BSS
6237 || (flag_zero_initialized_in_bss
6238 && initializer_zerop (DECL_INITIAL (decl))))
6244 /* If the target uses small data sections, select it. */
6245 else if (targetm.in_small_data_p (decl))
6247 if (ret == SECCAT_BSS)
6249 else if (targetm.have_srodata_section && ret == SECCAT_RODATA)
6250 ret = SECCAT_SRODATA;
6259 decl_readonly_section (const_tree decl, int reloc)
6261 switch (categorize_decl_for_section (decl, reloc))
6264 case SECCAT_RODATA_MERGE_STR:
6265 case SECCAT_RODATA_MERGE_STR_INIT:
6266 case SECCAT_RODATA_MERGE_CONST:
6267 case SECCAT_SRODATA:
6276 /* Select a section based on the above categorization. */
6279 default_elf_select_section (tree decl, int reloc,
6280 unsigned HOST_WIDE_INT align)
6283 switch (categorize_decl_for_section (decl, reloc))
6286 /* We're not supposed to be called on FUNCTION_DECLs. */
6289 return readonly_data_section;
6290 case SECCAT_RODATA_MERGE_STR:
6291 return mergeable_string_section (decl, align, 0);
6292 case SECCAT_RODATA_MERGE_STR_INIT:
6293 return mergeable_string_section (DECL_INITIAL (decl), align, 0);
6294 case SECCAT_RODATA_MERGE_CONST:
6295 return mergeable_constant_section (DECL_MODE (decl), align, 0);
6296 case SECCAT_SRODATA:
6300 return data_section;
6301 case SECCAT_DATA_REL:
6302 sname = ".data.rel";
6304 case SECCAT_DATA_REL_LOCAL:
6305 sname = ".data.rel.local";
6307 case SECCAT_DATA_REL_RO:
6308 sname = ".data.rel.ro";
6310 case SECCAT_DATA_REL_RO_LOCAL:
6311 sname = ".data.rel.ro.local";
6330 case SECCAT_EMUTLS_VAR:
6331 sname = targetm.emutls.var_section;
6333 case SECCAT_EMUTLS_TMPL:
6334 sname = targetm.emutls.tmpl_section;
6342 return get_named_section (decl, sname, reloc);
6345 /* Construct a unique section name based on the decl name and the
6346 categorization performed above. */
6349 default_unique_section (tree decl, int reloc)
6351 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6352 bool one_only = DECL_ONE_ONLY (decl) && !HAVE_COMDAT_GROUP;
6353 const char *prefix, *name, *linkonce;
6356 switch (categorize_decl_for_section (decl, reloc))
6359 prefix = one_only ? ".t" : ".text";
6362 case SECCAT_RODATA_MERGE_STR:
6363 case SECCAT_RODATA_MERGE_STR_INIT:
6364 case SECCAT_RODATA_MERGE_CONST:
6365 prefix = one_only ? ".r" : ".rodata";
6367 case SECCAT_SRODATA:
6368 prefix = one_only ? ".s2" : ".sdata2";
6371 prefix = one_only ? ".d" : ".data";
6373 case SECCAT_DATA_REL:
6374 prefix = one_only ? ".d.rel" : ".data.rel";
6376 case SECCAT_DATA_REL_LOCAL:
6377 prefix = one_only ? ".d.rel.local" : ".data.rel.local";
6379 case SECCAT_DATA_REL_RO:
6380 prefix = one_only ? ".d.rel.ro" : ".data.rel.ro";
6382 case SECCAT_DATA_REL_RO_LOCAL:
6383 prefix = one_only ? ".d.rel.ro.local" : ".data.rel.ro.local";
6386 prefix = one_only ? ".s" : ".sdata";
6389 prefix = one_only ? ".b" : ".bss";
6392 prefix = one_only ? ".sb" : ".sbss";
6395 prefix = one_only ? ".td" : ".tdata";
6398 prefix = one_only ? ".tb" : ".tbss";
6400 case SECCAT_EMUTLS_VAR:
6401 prefix = targetm.emutls.var_section;
6403 case SECCAT_EMUTLS_TMPL:
6404 prefix = targetm.emutls.tmpl_section;
6410 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
6411 name = targetm.strip_name_encoding (name);
6413 /* If we're using one_only, then there needs to be a .gnu.linkonce
6414 prefix to the section name. */
6415 linkonce = one_only ? ".gnu.linkonce" : "";
6417 string = ACONCAT ((linkonce, prefix, ".", name, NULL));
6419 DECL_SECTION_NAME (decl) = build_string (strlen (string), string);
6422 /* Like compute_reloc_for_constant, except for an RTX. The return value
6423 is a mask for which bit 1 indicates a global relocation, and bit 0
6424 indicates a local relocation. */
6427 compute_reloc_for_rtx_1 (rtx *xp, void *data)
6429 int *preloc = (int *) data;
6432 switch (GET_CODE (x))
6435 *preloc |= SYMBOL_REF_LOCAL_P (x) ? 1 : 2;
6448 compute_reloc_for_rtx (rtx x)
6452 switch (GET_CODE (x))
6458 for_each_rtx (&x, compute_reloc_for_rtx_1, &reloc);
6467 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED,
6469 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
6471 if (compute_reloc_for_rtx (x) & targetm.asm_out.reloc_rw_mask ())
6472 return data_section;
6474 return readonly_data_section;
6478 default_elf_select_rtx_section (enum machine_mode mode, rtx x,
6479 unsigned HOST_WIDE_INT align)
6481 int reloc = compute_reloc_for_rtx (x);
6483 /* ??? Handle small data here somehow. */
6485 if (reloc & targetm.asm_out.reloc_rw_mask ())
6488 return get_named_section (NULL, ".data.rel.ro.local", 1);
6490 return get_named_section (NULL, ".data.rel.ro", 3);
6493 return mergeable_constant_section (mode, align, 0);
6496 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6499 default_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
6504 /* Careful not to prod global register variables. */
6507 symbol = XEXP (rtl, 0);
6508 if (GET_CODE (symbol) != SYMBOL_REF)
6511 flags = SYMBOL_REF_FLAGS (symbol) & SYMBOL_FLAG_HAS_BLOCK_INFO;
6512 if (TREE_CODE (decl) == FUNCTION_DECL)
6513 flags |= SYMBOL_FLAG_FUNCTION;
6514 if (targetm.binds_local_p (decl))
6515 flags |= SYMBOL_FLAG_LOCAL;
6516 if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl)
6517 && DECL_TLS_MODEL (decl) != TLS_MODEL_EMULATED)
6518 flags |= DECL_TLS_MODEL (decl) << SYMBOL_FLAG_TLS_SHIFT;
6519 else if (targetm.in_small_data_p (decl))
6520 flags |= SYMBOL_FLAG_SMALL;
6521 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6522 being PUBLIC, the thing *must* be defined in this translation unit.
6523 Prevent this buglet from being propagated into rtl code as well. */
6524 if (DECL_P (decl) && DECL_EXTERNAL (decl) && TREE_PUBLIC (decl))
6525 flags |= SYMBOL_FLAG_EXTERNAL;
6527 SYMBOL_REF_FLAGS (symbol) = flags;
6530 /* By default, we do nothing for encode_section_info, so we need not
6531 do anything but discard the '*' marker. */
6534 default_strip_name_encoding (const char *str)
6536 return str + (*str == '*');
6539 #ifdef ASM_OUTPUT_DEF
6540 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6541 anchor relative to ".", the current section position. */
6544 default_asm_output_anchor (rtx symbol)
6548 sprintf (buffer, "*. + " HOST_WIDE_INT_PRINT_DEC,
6549 SYMBOL_REF_BLOCK_OFFSET (symbol));
6550 ASM_OUTPUT_DEF (asm_out_file, XSTR (symbol, 0), buffer);
6554 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6557 default_use_anchors_for_symbol_p (const_rtx symbol)
6562 /* Don't use anchors for mergeable sections. The linker might move
6563 the objects around. */
6564 sect = SYMBOL_REF_BLOCK (symbol)->sect;
6565 if (sect->common.flags & SECTION_MERGE)
6568 /* Don't use anchors for small data sections. The small data register
6569 acts as an anchor for such sections. */
6570 if (sect->common.flags & SECTION_SMALL)
6573 decl = SYMBOL_REF_DECL (symbol);
6574 if (decl && DECL_P (decl))
6576 /* Don't use section anchors for decls that might be defined by
6578 if (!targetm.binds_local_p (decl))
6581 /* Don't use section anchors for decls that will be placed in a
6582 small data section. */
6583 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6584 one above. The problem is that we only use SECTION_SMALL for
6585 sections that should be marked as small in the section directive. */
6586 if (targetm.in_small_data_p (decl))
6592 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6593 wrt cross-module name binding. */
6596 default_binds_local_p (const_tree exp)
6598 return default_binds_local_p_1 (exp, flag_shlib);
6602 default_binds_local_p_1 (const_tree exp, int shlib)
6606 /* A non-decl is an entry in the constant pool. */
6609 /* Weakrefs may not bind locally, even though the weakref itself is
6610 always static and therefore local. */
6611 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp)))
6613 /* Static variables are always local. */
6614 else if (! TREE_PUBLIC (exp))
6616 /* A variable is local if the user has said explicitly that it will
6618 else if (DECL_VISIBILITY_SPECIFIED (exp)
6619 && DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
6621 /* Variables defined outside this object might not be local. */
6622 else if (DECL_EXTERNAL (exp))
6624 /* If defined in this object and visibility is not default, must be
6626 else if (DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
6628 /* Default visibility weak data can be overridden by a strong symbol
6629 in another module and so are not local. */
6630 else if (DECL_WEAK (exp))
6632 /* If PIC, then assume that any global name can be overridden by
6633 symbols resolved from other modules, unless we are compiling with
6634 -fwhole-program, which assumes that names are local. */
6636 local_p = flag_whole_program;
6637 /* Uninitialized COMMON variable may be unified with symbols
6638 resolved from other modules. */
6639 else if (DECL_COMMON (exp)
6640 && (DECL_INITIAL (exp) == NULL
6641 || DECL_INITIAL (exp) == error_mark_node))
6643 /* Otherwise we're left with initialized (or non-common) global data
6644 which is of necessity defined locally. */
6651 /* Default function to output code that will globalize a label. A
6652 target must define GLOBAL_ASM_OP or provide its own function to
6653 globalize a label. */
6654 #ifdef GLOBAL_ASM_OP
6656 default_globalize_label (FILE * stream, const char *name)
6658 fputs (GLOBAL_ASM_OP, stream);
6659 assemble_name (stream, name);
6660 putc ('\n', stream);
6662 #endif /* GLOBAL_ASM_OP */
6664 /* Default function to output code that will globalize a declaration. */
6666 default_globalize_decl_name (FILE * stream, tree decl)
6668 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
6669 targetm.asm_out.globalize_label (stream, name);
6672 /* Default function to output a label for unwind information. The
6673 default is to do nothing. A target that needs nonlocal labels for
6674 unwind information must provide its own function to do this. */
6676 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED,
6677 tree decl ATTRIBUTE_UNUSED,
6678 int for_eh ATTRIBUTE_UNUSED,
6679 int empty ATTRIBUTE_UNUSED)
6683 /* Default function to output a label to divide up the exception table.
6684 The default is to do nothing. A target that needs/wants to divide
6685 up the table must provide it's own function to do this. */
6687 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED)
6691 /* This is how to output an internal numbered label where PREFIX is
6692 the class of label and LABELNO is the number within the class. */
6695 default_internal_label (FILE *stream, const char *prefix,
6696 unsigned long labelno)
6698 char *const buf = (char *) alloca (40 + strlen (prefix));
6699 ASM_GENERATE_INTERNAL_LABEL (buf, prefix, labelno);
6700 ASM_OUTPUT_INTERNAL_LABEL (stream, buf);
6703 /* This is the default behavior at the beginning of a file. It's
6704 controlled by two other target-hook toggles. */
6706 default_file_start (void)
6708 if (targetm.file_start_app_off
6709 && !(flag_verbose_asm || flag_debug_asm || flag_dump_rtl_in_asm))
6710 fputs (ASM_APP_OFF, asm_out_file);
6712 if (targetm.file_start_file_directive)
6713 output_file_directive (asm_out_file, main_input_filename);
6716 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6717 which emits a special section directive used to indicate whether or
6718 not this object file needs an executable stack. This is primarily
6719 a GNU extension to ELF but could be used on other targets. */
6721 int trampolines_created;
6724 file_end_indicate_exec_stack (void)
6726 unsigned int flags = SECTION_DEBUG;
6727 if (trampolines_created)
6728 flags |= SECTION_CODE;
6730 switch_to_section (get_section (".note.GNU-stack", flags, NULL));
6733 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6734 a get_unnamed_section callback. */
6737 output_section_asm_op (const void *directive)
6739 fprintf (asm_out_file, "%s\n", (const char *) directive);
6742 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6743 the current section is NEW_SECTION. */
6746 switch_to_section (section *new_section)
6748 if (in_section == new_section)
6751 if (new_section->common.flags & SECTION_FORGET)
6754 in_section = new_section;
6756 switch (SECTION_STYLE (new_section))
6760 && !crtl->subsections.unlikely_text_section_name
6761 && strcmp (new_section->named.name,
6762 UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
6763 crtl->subsections.unlikely_text_section_name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
6765 targetm.asm_out.named_section (new_section->named.name,
6766 new_section->named.common.flags,
6767 new_section->named.decl);
6770 case SECTION_UNNAMED:
6771 new_section->unnamed.callback (new_section->unnamed.data);
6774 case SECTION_NOSWITCH:
6779 new_section->common.flags |= SECTION_DECLARED;
6782 /* If block symbol SYMBOL has not yet been assigned an offset, place
6783 it at the end of its block. */
6786 place_block_symbol (rtx symbol)
6788 unsigned HOST_WIDE_INT size, mask, offset;
6789 struct constant_descriptor_rtx *desc;
6790 unsigned int alignment;
6791 struct object_block *block;
6794 gcc_assert (SYMBOL_REF_BLOCK (symbol));
6795 if (SYMBOL_REF_BLOCK_OFFSET (symbol) >= 0)
6798 /* Work out the symbol's size and alignment. */
6799 if (CONSTANT_POOL_ADDRESS_P (symbol))
6801 desc = SYMBOL_REF_CONSTANT (symbol);
6802 alignment = desc->align;
6803 size = GET_MODE_SIZE (desc->mode);
6805 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
6807 decl = SYMBOL_REF_DECL (symbol);
6808 alignment = get_constant_alignment (decl);
6809 size = get_constant_size (decl);
6813 decl = SYMBOL_REF_DECL (symbol);
6814 alignment = DECL_ALIGN (decl);
6815 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
6818 /* Calculate the object's offset from the start of the block. */
6819 block = SYMBOL_REF_BLOCK (symbol);
6820 mask = alignment / BITS_PER_UNIT - 1;
6821 offset = (block->size + mask) & ~mask;
6822 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
6824 /* Record the block's new alignment and size. */
6825 block->alignment = MAX (block->alignment, alignment);
6826 block->size = offset + size;
6828 VEC_safe_push (rtx, gc, block->objects, symbol);
6831 /* Return the anchor that should be used to address byte offset OFFSET
6832 from the first object in BLOCK. MODEL is the TLS model used
6836 get_section_anchor (struct object_block *block, HOST_WIDE_INT offset,
6837 enum tls_model model)
6840 unsigned int begin, middle, end;
6841 unsigned HOST_WIDE_INT min_offset, max_offset, range, bias, delta;
6844 /* Work out the anchor's offset. Use an offset of 0 for the first
6845 anchor so that we don't pessimize the case where we take the address
6846 of a variable at the beginning of the block. This is particularly
6847 useful when a block has only one variable assigned to it.
6849 We try to place anchors RANGE bytes apart, so there can then be
6850 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
6851 a ptr_mode offset. With some target settings, the lowest such
6852 anchor might be out of range for the lowest ptr_mode offset;
6853 likewise the highest anchor for the highest offset. Use anchors
6854 at the extreme ends of the ptr_mode range in such cases.
6856 All arithmetic uses unsigned integers in order to avoid
6858 max_offset = (unsigned HOST_WIDE_INT) targetm.max_anchor_offset;
6859 min_offset = (unsigned HOST_WIDE_INT) targetm.min_anchor_offset;
6860 range = max_offset - min_offset + 1;
6865 bias = 1 << (GET_MODE_BITSIZE (ptr_mode) - 1);
6868 delta = -(unsigned HOST_WIDE_INT) offset + max_offset;
6869 delta -= delta % range;
6872 offset = (HOST_WIDE_INT) (-delta);
6876 delta = (unsigned HOST_WIDE_INT) offset - min_offset;
6877 delta -= delta % range;
6878 if (delta > bias - 1)
6880 offset = (HOST_WIDE_INT) delta;
6884 /* Do a binary search to see if there's already an anchor we can use.
6885 Set BEGIN to the new anchor's index if not. */
6887 end = VEC_length (rtx, block->anchors);
6888 while (begin != end)
6890 middle = (end + begin) / 2;
6891 anchor = VEC_index (rtx, block->anchors, middle);
6892 if (SYMBOL_REF_BLOCK_OFFSET (anchor) > offset)
6894 else if (SYMBOL_REF_BLOCK_OFFSET (anchor) < offset)
6896 else if (SYMBOL_REF_TLS_MODEL (anchor) > model)
6898 else if (SYMBOL_REF_TLS_MODEL (anchor) < model)
6904 /* Create a new anchor with a unique label. */
6905 ASM_GENERATE_INTERNAL_LABEL (label, "LANCHOR", anchor_labelno++);
6906 anchor = create_block_symbol (ggc_strdup (label), block, offset);
6907 SYMBOL_REF_FLAGS (anchor) |= SYMBOL_FLAG_LOCAL | SYMBOL_FLAG_ANCHOR;
6908 SYMBOL_REF_FLAGS (anchor) |= model << SYMBOL_FLAG_TLS_SHIFT;
6910 /* Insert it at index BEGIN. */
6911 VEC_safe_insert (rtx, gc, block->anchors, begin, anchor);
6915 /* Output the objects in BLOCK. */
6918 output_object_block (struct object_block *block)
6920 struct constant_descriptor_rtx *desc;
6922 HOST_WIDE_INT offset;
6926 if (block->objects == NULL)
6929 /* Switch to the section and make sure that the first byte is
6930 suitably aligned. */
6931 switch_to_section (block->sect);
6932 assemble_align (block->alignment);
6934 /* Define the values of all anchors relative to the current section
6936 for (i = 0; VEC_iterate (rtx, block->anchors, i, symbol); i++)
6937 targetm.asm_out.output_anchor (symbol);
6939 /* Output the objects themselves. */
6941 for (i = 0; VEC_iterate (rtx, block->objects, i, symbol); i++)
6943 /* Move to the object's offset, padding with zeros if necessary. */
6944 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol) - offset);
6945 offset = SYMBOL_REF_BLOCK_OFFSET (symbol);
6946 if (CONSTANT_POOL_ADDRESS_P (symbol))
6948 desc = SYMBOL_REF_CONSTANT (symbol);
6949 output_constant_pool_1 (desc, 1);
6950 offset += GET_MODE_SIZE (desc->mode);
6952 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
6954 decl = SYMBOL_REF_DECL (symbol);
6955 assemble_constant_contents (decl, XSTR (symbol, 0),
6956 get_constant_alignment (decl));
6957 offset += get_constant_size (decl);
6961 decl = SYMBOL_REF_DECL (symbol);
6962 assemble_variable_contents (decl, XSTR (symbol, 0), false);
6963 offset += tree_low_cst (DECL_SIZE_UNIT (decl), 1);
6968 /* A htab_traverse callback used to call output_object_block for
6969 each member of object_block_htab. */
6972 output_object_block_htab (void **slot, void *data ATTRIBUTE_UNUSED)
6974 output_object_block ((struct object_block *) (*slot));
6978 /* Output the definitions of all object_blocks. */
6981 output_object_blocks (void)
6983 htab_traverse (object_block_htab, output_object_block_htab, NULL);
6986 /* This function provides a possible implementation of the
6987 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
6988 by -frecord-gcc-switches it creates a new mergeable, string section in the
6989 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
6990 contains the switches in ASCII format.
6992 FIXME: This code does not correctly handle double quote characters
6993 that appear inside strings, (it strips them rather than preserving them).
6994 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
6995 characters - instead it treats them as sub-string separators. Since
6996 we want to emit NUL strings terminators into the object file we have to use
7000 elf_record_gcc_switches (print_switch_type type, const char * name)
7002 static char buffer[1024];
7004 /* This variable is used as part of a simplistic heuristic to detect
7005 command line switches which take an argument:
7007 "If a command line option does not start with a dash then
7008 it is an argument for the previous command line option."
7010 This fails in the case of the command line option which is the name
7011 of the file to compile, but otherwise it is pretty reasonable. */
7012 static bool previous_name_held_back = FALSE;
7016 case SWITCH_TYPE_PASSED:
7019 if (previous_name_held_back)
7021 unsigned int len = strlen (buffer);
7023 snprintf (buffer + len, sizeof buffer - len, " %s", name);
7024 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
7025 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
7026 previous_name_held_back = FALSE;
7030 strncpy (buffer, name, sizeof buffer);
7031 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
7032 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
7037 if (previous_name_held_back)
7039 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
7040 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
7043 strncpy (buffer, name, sizeof buffer);
7044 previous_name_held_back = TRUE;
7048 case SWITCH_TYPE_DESCRIPTIVE:
7051 /* Distinguish between invocations where name is NULL. */
7052 static bool started = false;
7056 if (previous_name_held_back)
7058 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
7059 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
7066 sec = get_section (targetm.asm_out.record_gcc_switches_section,
7070 | (SECTION_ENTSIZE & 1),
7072 switch_to_section (sec);
7081 /* The return value is currently ignored by the caller, but must be 0.
7082 For -fverbose-asm the return value would be the number of characters
7083 emitted into the assembler file. */
7087 /* Emit text to declare externally defined symbols. It is needed to
7088 properly support non-default visibility. */
7090 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED,
7092 const char *name ATTRIBUTE_UNUSED)
7094 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7095 set in order to avoid putting out names that are never really
7097 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
7098 && targetm.binds_local_p (decl))
7099 maybe_assemble_visibility (decl);
7102 #include "gt-varasm.h"