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 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)
1173 /* If the decl has been given an explicit section name, then it
1174 isn't common, and shouldn't be handled as such. */
1175 if (DECL_COMMON (decl) && DECL_SECTION_NAME (decl) == NULL)
1177 if (DECL_THREAD_LOCAL_P (decl))
1178 return tls_comm_section;
1179 /* This cannot be common bss for an emulated TLS object without
1180 a register_common hook. */
1181 else if (DECL_TLS_MODEL (decl) == TLS_MODEL_EMULATED
1182 && !targetm.emutls.register_common)
1184 else if (TREE_PUBLIC (decl) && bss_initializer_p (decl))
1185 return comm_section;
1188 if (DECL_INITIAL (decl) == error_mark_node)
1189 reloc = contains_pointers_p (TREE_TYPE (decl)) ? 3 : 0;
1190 else if (DECL_INITIAL (decl))
1191 reloc = compute_reloc_for_constant (DECL_INITIAL (decl));
1195 resolve_unique_section (decl, reloc, flag_data_sections);
1196 if (IN_NAMED_SECTION (decl))
1197 return get_named_section (decl, NULL, reloc);
1199 if (!DECL_THREAD_LOCAL_P (decl)
1200 && !(prefer_noswitch_p && targetm.have_switchable_bss_sections)
1201 && bss_initializer_p (decl))
1203 if (!TREE_PUBLIC (decl))
1204 return lcomm_section;
1205 if (bss_noswitch_section)
1206 return bss_noswitch_section;
1209 return targetm.asm_out.select_section (decl, reloc, DECL_ALIGN (decl));
1212 /* Return the block into which object_block DECL should be placed. */
1214 static struct object_block *
1215 get_block_for_decl (tree decl)
1219 if (TREE_CODE (decl) == VAR_DECL)
1221 /* The object must be defined in this translation unit. */
1222 if (DECL_EXTERNAL (decl))
1225 /* There's no point using object blocks for something that is
1226 isolated by definition. */
1227 if (DECL_ONE_ONLY (decl))
1231 /* We can only calculate block offsets if the decl has a known
1233 if (DECL_SIZE_UNIT (decl) == NULL)
1235 if (!host_integerp (DECL_SIZE_UNIT (decl), 1))
1238 /* Find out which section should contain DECL. We cannot put it into
1239 an object block if it requires a standalone definition. */
1240 if (TREE_CODE (decl) == VAR_DECL)
1241 align_variable (decl, 0);
1242 sect = get_variable_section (decl, true);
1243 if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
1246 return get_block_for_section (sect);
1249 /* Make sure block symbol SYMBOL is in block BLOCK. */
1252 change_symbol_block (rtx symbol, struct object_block *block)
1254 if (block != SYMBOL_REF_BLOCK (symbol))
1256 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol) < 0);
1257 SYMBOL_REF_BLOCK (symbol) = block;
1261 /* Return true if it is possible to put DECL in an object_block. */
1264 use_blocks_for_decl_p (tree decl)
1266 /* Only data DECLs can be placed into object blocks. */
1267 if (TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != CONST_DECL)
1270 /* Detect decls created by dw2_force_const_mem. Such decls are
1271 special because DECL_INITIAL doesn't specify the decl's true value.
1272 dw2_output_indirect_constants will instead call assemble_variable
1273 with dont_output_data set to 1 and then print the contents itself. */
1274 if (DECL_INITIAL (decl) == decl)
1277 /* If this decl is an alias, then we don't want to emit a definition. */
1278 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl)))
1284 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1285 have static storage duration. In other words, it should not be an
1286 automatic variable, including PARM_DECLs.
1288 There is, however, one exception: this function handles variables
1289 explicitly placed in a particular register by the user.
1291 This is never called for PARM_DECL nodes. */
1294 make_decl_rtl (tree decl)
1296 const char *name = 0;
1300 /* Check that we are not being given an automatic variable. */
1301 gcc_assert (TREE_CODE (decl) != PARM_DECL
1302 && TREE_CODE (decl) != RESULT_DECL);
1304 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1305 gcc_assert (TREE_CODE (decl) != VAR_DECL
1306 || TREE_STATIC (decl)
1307 || TREE_PUBLIC (decl)
1308 || DECL_EXTERNAL (decl)
1309 || DECL_REGISTER (decl));
1311 /* And that we were not given a type or a label. */
1312 gcc_assert (TREE_CODE (decl) != TYPE_DECL
1313 && TREE_CODE (decl) != LABEL_DECL);
1315 /* For a duplicate declaration, we can be called twice on the
1316 same DECL node. Don't discard the RTL already made. */
1317 if (DECL_RTL_SET_P (decl))
1319 /* If the old RTL had the wrong mode, fix the mode. */
1320 x = DECL_RTL (decl);
1321 if (GET_MODE (x) != DECL_MODE (decl))
1322 SET_DECL_RTL (decl, adjust_address_nv (x, DECL_MODE (decl), 0));
1324 if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1327 /* ??? Another way to do this would be to maintain a hashed
1328 table of such critters. Instead of adding stuff to a DECL
1329 to give certain attributes to it, we could use an external
1330 hash map from DECL to set of attributes. */
1332 /* Let the target reassign the RTL if it wants.
1333 This is necessary, for example, when one machine specific
1334 decl attribute overrides another. */
1335 targetm.encode_section_info (decl, DECL_RTL (decl), false);
1337 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1338 on the new decl information. */
1340 && GET_CODE (XEXP (x, 0)) == SYMBOL_REF
1341 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x, 0)))
1342 change_symbol_block (XEXP (x, 0), get_block_for_decl (decl));
1344 /* Make this function static known to the mudflap runtime. */
1345 if (flag_mudflap && TREE_CODE (decl) == VAR_DECL)
1346 mudflap_enqueue_decl (decl);
1351 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
1353 if (name[0] != '*' && TREE_CODE (decl) != FUNCTION_DECL
1354 && DECL_REGISTER (decl))
1356 error ("register name not specified for %q+D", decl);
1358 else if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1360 const char *asmspec = name+1;
1361 reg_number = decode_reg_name (asmspec);
1362 /* First detect errors in declaring global registers. */
1363 if (reg_number == -1)
1364 error ("register name not specified for %q+D", decl);
1365 else if (reg_number < 0)
1366 error ("invalid register name for %q+D", decl);
1367 else if (TYPE_MODE (TREE_TYPE (decl)) == BLKmode)
1368 error ("data type of %q+D isn%'t suitable for a register",
1370 else if (! HARD_REGNO_MODE_OK (reg_number, TYPE_MODE (TREE_TYPE (decl))))
1371 error ("register specified for %q+D isn%'t suitable for data type",
1373 /* Now handle properly declared static register variables. */
1378 if (DECL_INITIAL (decl) != 0 && TREE_STATIC (decl))
1380 DECL_INITIAL (decl) = 0;
1381 error ("global register variable has initial value");
1383 if (TREE_THIS_VOLATILE (decl))
1384 warning (OPT_Wvolatile_register_var,
1385 "optimization may eliminate reads and/or "
1386 "writes to register variables");
1388 /* If the user specified one of the eliminables registers here,
1389 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1390 confused with that register and be eliminated. This usage is
1391 somewhat suspect... */
1393 SET_DECL_RTL (decl, gen_rtx_raw_REG (DECL_MODE (decl), reg_number));
1394 ORIGINAL_REGNO (DECL_RTL (decl)) = reg_number;
1395 REG_USERVAR_P (DECL_RTL (decl)) = 1;
1397 if (TREE_STATIC (decl))
1399 /* Make this register global, so not usable for anything
1401 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1402 name = IDENTIFIER_POINTER (DECL_NAME (decl));
1403 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file, decl, reg_number, name);
1405 nregs = hard_regno_nregs[reg_number][DECL_MODE (decl)];
1407 globalize_reg (reg_number + --nregs);
1410 /* As a register variable, it has no section. */
1414 /* Now handle ordinary static variables and functions (in memory).
1415 Also handle vars declared register invalidly. */
1416 else if (name[0] == '*')
1418 #ifdef REGISTER_PREFIX
1419 if (strlen (REGISTER_PREFIX) != 0)
1421 reg_number = decode_reg_name (name);
1422 if (reg_number >= 0 || reg_number == -3)
1423 error ("register name given for non-register variable %q+D", decl);
1428 /* Specifying a section attribute on a variable forces it into a
1429 non-.bss section, and thus it cannot be common. */
1430 if (TREE_CODE (decl) == VAR_DECL
1431 && DECL_SECTION_NAME (decl) != NULL_TREE
1432 && DECL_INITIAL (decl) == NULL_TREE
1433 && DECL_COMMON (decl))
1434 DECL_COMMON (decl) = 0;
1436 /* Variables can't be both common and weak. */
1437 if (TREE_CODE (decl) == VAR_DECL && DECL_WEAK (decl))
1438 DECL_COMMON (decl) = 0;
1440 if (use_object_blocks_p () && use_blocks_for_decl_p (decl))
1441 x = create_block_symbol (name, get_block_for_decl (decl), -1);
1443 x = gen_rtx_SYMBOL_REF (Pmode, name);
1444 SYMBOL_REF_WEAK (x) = DECL_WEAK (decl);
1445 SET_SYMBOL_REF_DECL (x, decl);
1447 x = gen_rtx_MEM (DECL_MODE (decl), x);
1448 if (TREE_CODE (decl) != FUNCTION_DECL)
1449 set_mem_attributes (x, decl, 1);
1450 SET_DECL_RTL (decl, x);
1452 /* Optionally set flags or add text to the name to record information
1453 such as that it is a function name.
1454 If the name is changed, the macro ASM_OUTPUT_LABELREF
1455 will have to know how to strip this information. */
1456 targetm.encode_section_info (decl, DECL_RTL (decl), true);
1458 /* Make this function static known to the mudflap runtime. */
1459 if (flag_mudflap && TREE_CODE (decl) == VAR_DECL)
1460 mudflap_enqueue_decl (decl);
1463 /* Output a string of literal assembler code
1464 for an `asm' keyword used between functions. */
1467 assemble_asm (tree string)
1471 if (TREE_CODE (string) == ADDR_EXPR)
1472 string = TREE_OPERAND (string, 0);
1474 fprintf (asm_out_file, "\t%s\n", TREE_STRING_POINTER (string));
1477 /* Record an element in the table of global destructors. SYMBOL is
1478 a SYMBOL_REF of the function to be called; PRIORITY is a number
1479 between 0 and MAX_INIT_PRIORITY. */
1482 default_stabs_asm_out_destructor (rtx symbol ATTRIBUTE_UNUSED,
1483 int priority ATTRIBUTE_UNUSED)
1485 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1486 /* Tell GNU LD that this is part of the static destructor set.
1487 This will work for any system that uses stabs, most usefully
1489 dbxout_begin_simple_stabs ("___DTOR_LIST__", 22 /* N_SETT */);
1490 dbxout_stab_value_label (XSTR (symbol, 0));
1492 sorry ("global destructors not supported on this target");
1496 /* Write the address of the entity given by SYMBOL to SEC. */
1498 assemble_addr_to_section (rtx symbol, section *sec)
1500 switch_to_section (sec);
1501 assemble_align (POINTER_SIZE);
1502 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1505 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1506 not) section for PRIORITY. */
1508 get_cdtor_priority_section (int priority, bool constructor_p)
1512 /* ??? This only works reliably with the GNU linker. */
1513 sprintf (buf, "%s.%.5u",
1514 constructor_p ? ".ctors" : ".dtors",
1515 /* Invert the numbering so the linker puts us in the proper
1516 order; constructors are run from right to left, and the
1517 linker sorts in increasing order. */
1518 MAX_INIT_PRIORITY - priority);
1519 return get_section (buf, SECTION_WRITE, NULL);
1523 default_named_section_asm_out_destructor (rtx symbol, int priority)
1527 if (priority != DEFAULT_INIT_PRIORITY)
1528 sec = get_cdtor_priority_section (priority,
1529 /*constructor_p=*/false);
1531 sec = get_section (".dtors", SECTION_WRITE, NULL);
1533 assemble_addr_to_section (symbol, sec);
1536 #ifdef DTORS_SECTION_ASM_OP
1538 default_dtor_section_asm_out_destructor (rtx symbol,
1539 int priority ATTRIBUTE_UNUSED)
1541 assemble_addr_to_section (symbol, dtors_section);
1545 /* Likewise for global constructors. */
1548 default_stabs_asm_out_constructor (rtx symbol ATTRIBUTE_UNUSED,
1549 int priority ATTRIBUTE_UNUSED)
1551 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1552 /* Tell GNU LD that this is part of the static destructor set.
1553 This will work for any system that uses stabs, most usefully
1555 dbxout_begin_simple_stabs ("___CTOR_LIST__", 22 /* N_SETT */);
1556 dbxout_stab_value_label (XSTR (symbol, 0));
1558 sorry ("global constructors not supported on this target");
1563 default_named_section_asm_out_constructor (rtx symbol, int priority)
1567 if (priority != DEFAULT_INIT_PRIORITY)
1568 sec = get_cdtor_priority_section (priority,
1569 /*constructor_p=*/true);
1571 sec = get_section (".ctors", SECTION_WRITE, NULL);
1573 assemble_addr_to_section (symbol, sec);
1576 #ifdef CTORS_SECTION_ASM_OP
1578 default_ctor_section_asm_out_constructor (rtx symbol,
1579 int priority ATTRIBUTE_UNUSED)
1581 assemble_addr_to_section (symbol, ctors_section);
1585 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1586 a nonzero value if the constant pool should be output before the
1587 start of the function, or a zero value if the pool should output
1588 after the end of the function. The default is to put it before the
1591 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1592 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1595 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1596 to be output to assembler.
1597 Set first_global_object_name and weak_global_object_name as appropriate. */
1600 notice_global_symbol (tree decl)
1602 const char **type = &first_global_object_name;
1604 if (first_global_object_name
1605 || !TREE_PUBLIC (decl)
1606 || DECL_EXTERNAL (decl)
1607 || !DECL_NAME (decl)
1608 || (TREE_CODE (decl) != FUNCTION_DECL
1609 && (TREE_CODE (decl) != VAR_DECL
1610 || (DECL_COMMON (decl)
1611 && (DECL_INITIAL (decl) == 0
1612 || DECL_INITIAL (decl) == error_mark_node))))
1613 || !MEM_P (DECL_RTL (decl)))
1616 /* We win when global object is found, but it is useful to know about weak
1617 symbol as well so we can produce nicer unique names. */
1618 if (DECL_WEAK (decl) || DECL_ONE_ONLY (decl) || flag_shlib)
1619 type = &weak_global_object_name;
1625 rtx decl_rtl = DECL_RTL (decl);
1627 p = targetm.strip_name_encoding (XSTR (XEXP (decl_rtl, 0), 0));
1628 name = ggc_strdup (p);
1634 /* Output assembler code for the constant pool of a function and associated
1635 with defining the name of the function. DECL describes the function.
1636 NAME is the function's name. For the constant pool, we use the current
1637 constant pool data. */
1640 assemble_start_function (tree decl, const char *fnname)
1643 char tmp_label[100];
1644 bool hot_label_written = false;
1646 crtl->subsections.unlikely_text_section_name = NULL;
1648 first_function_block_is_cold = false;
1649 if (flag_reorder_blocks_and_partition)
1651 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTB", const_labelno);
1652 crtl->subsections.hot_section_label = ggc_strdup (tmp_label);
1653 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDB", const_labelno);
1654 crtl->subsections.cold_section_label = ggc_strdup (tmp_label);
1655 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTE", const_labelno);
1656 crtl->subsections.hot_section_end_label = ggc_strdup (tmp_label);
1657 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDE", const_labelno);
1658 crtl->subsections.cold_section_end_label = ggc_strdup (tmp_label);
1663 crtl->subsections.hot_section_label = NULL;
1664 crtl->subsections.cold_section_label = NULL;
1665 crtl->subsections.hot_section_end_label = NULL;
1666 crtl->subsections.cold_section_end_label = NULL;
1669 /* The following code does not need preprocessing in the assembler. */
1673 if (CONSTANT_POOL_BEFORE_FUNCTION)
1674 output_constant_pool (fnname, decl);
1676 resolve_unique_section (decl, 0, flag_function_sections);
1678 /* Make sure the not and cold text (code) sections are properly
1679 aligned. This is necessary here in the case where the function
1680 has both hot and cold sections, because we don't want to re-set
1681 the alignment when the section switch happens mid-function. */
1683 if (flag_reorder_blocks_and_partition)
1685 switch_to_section (unlikely_text_section ());
1686 assemble_align (DECL_ALIGN (decl));
1687 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.cold_section_label);
1689 /* When the function starts with a cold section, we need to explicitly
1690 align the hot section and write out the hot section label.
1691 But if the current function is a thunk, we do not have a CFG. */
1693 && BB_PARTITION (ENTRY_BLOCK_PTR->next_bb) == BB_COLD_PARTITION)
1695 switch_to_section (text_section);
1696 assemble_align (DECL_ALIGN (decl));
1697 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_label);
1698 hot_label_written = true;
1699 first_function_block_is_cold = true;
1702 else if (DECL_SECTION_NAME (decl))
1704 /* Calls to function_section rely on first_function_block_is_cold
1705 being accurate. The first block may be cold even if we aren't
1706 doing partitioning, if the entire function was decided by
1707 choose_function_section (predict.c) to be cold. */
1709 initialize_cold_section_name ();
1711 if (crtl->subsections.unlikely_text_section_name
1712 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)),
1713 crtl->subsections.unlikely_text_section_name) == 0)
1714 first_function_block_is_cold = true;
1717 in_cold_section_p = first_function_block_is_cold;
1719 /* Switch to the correct text section for the start of the function. */
1721 switch_to_section (function_section (decl));
1722 if (flag_reorder_blocks_and_partition
1723 && !hot_label_written)
1724 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_label);
1726 /* Tell assembler to move to target machine's alignment for functions. */
1727 align = floor_log2 (DECL_ALIGN (decl) / BITS_PER_UNIT);
1730 ASM_OUTPUT_ALIGN (asm_out_file, align);
1733 /* Handle a user-specified function alignment.
1734 Note that we still need to align to DECL_ALIGN, as above,
1735 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1736 if (! DECL_USER_ALIGN (decl)
1737 && align_functions_log > align
1738 && optimize_function_for_speed_p (cfun))
1740 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1741 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file,
1742 align_functions_log, align_functions - 1);
1744 ASM_OUTPUT_ALIGN (asm_out_file, align_functions_log);
1748 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1749 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file, fnname);
1752 (*debug_hooks->begin_function) (decl);
1754 /* Make function name accessible from other files, if appropriate. */
1756 if (TREE_PUBLIC (decl))
1758 notice_global_symbol (decl);
1760 globalize_decl (decl);
1762 maybe_assemble_visibility (decl);
1765 if (DECL_PRESERVE_P (decl))
1766 targetm.asm_out.mark_decl_preserved (fnname);
1768 /* Do any machine/system dependent processing of the function name. */
1769 #ifdef ASM_DECLARE_FUNCTION_NAME
1770 ASM_DECLARE_FUNCTION_NAME (asm_out_file, fnname, current_function_decl);
1772 /* Standard thing is just output label for the function. */
1773 ASM_OUTPUT_LABEL (asm_out_file, fnname);
1774 #endif /* ASM_DECLARE_FUNCTION_NAME */
1777 /* Output assembler code associated with defining the size of the
1778 function. DECL describes the function. NAME is the function's name. */
1781 assemble_end_function (tree decl, const char *fnname ATTRIBUTE_UNUSED)
1783 #ifdef ASM_DECLARE_FUNCTION_SIZE
1784 /* We could have switched section in the middle of the function. */
1785 if (flag_reorder_blocks_and_partition)
1786 switch_to_section (function_section (decl));
1787 ASM_DECLARE_FUNCTION_SIZE (asm_out_file, fnname, decl);
1789 if (! CONSTANT_POOL_BEFORE_FUNCTION)
1791 output_constant_pool (fnname, decl);
1792 switch_to_section (function_section (decl)); /* need to switch back */
1794 /* Output labels for end of hot/cold text sections (to be used by
1796 if (flag_reorder_blocks_and_partition)
1798 section *save_text_section;
1800 save_text_section = in_section;
1801 switch_to_section (unlikely_text_section ());
1802 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.cold_section_end_label);
1803 if (first_function_block_is_cold)
1804 switch_to_section (text_section);
1806 switch_to_section (function_section (decl));
1807 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_end_label);
1808 switch_to_section (save_text_section);
1812 /* Assemble code to leave SIZE bytes of zeros. */
1815 assemble_zeros (unsigned HOST_WIDE_INT size)
1817 /* Do no output if -fsyntax-only. */
1818 if (flag_syntax_only)
1821 #ifdef ASM_NO_SKIP_IN_TEXT
1822 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1823 so we must output 0s explicitly in the text section. */
1824 if (ASM_NO_SKIP_IN_TEXT && (in_section->common.flags & SECTION_CODE) != 0)
1826 unsigned HOST_WIDE_INT i;
1827 for (i = 0; i < size; i++)
1828 assemble_integer (const0_rtx, 1, BITS_PER_UNIT, 1);
1833 ASM_OUTPUT_SKIP (asm_out_file, size);
1836 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1839 assemble_align (int align)
1841 if (align > BITS_PER_UNIT)
1843 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
1847 /* Assemble a string constant with the specified C string as contents. */
1850 assemble_string (const char *p, int size)
1855 /* If the string is very long, split it up. */
1859 int thissize = size - pos;
1860 if (thissize > maximum)
1863 ASM_OUTPUT_ASCII (asm_out_file, p, thissize);
1871 /* A noswitch_section_callback for lcomm_section. */
1874 emit_local (tree decl ATTRIBUTE_UNUSED,
1875 const char *name ATTRIBUTE_UNUSED,
1876 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1877 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1879 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1880 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, decl, name,
1881 size, DECL_ALIGN (decl));
1883 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1884 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, DECL_ALIGN (decl));
1887 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
1892 /* A noswitch_section_callback for bss_noswitch_section. */
1894 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
1896 emit_bss (tree decl ATTRIBUTE_UNUSED,
1897 const char *name ATTRIBUTE_UNUSED,
1898 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1899 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1901 #if defined ASM_OUTPUT_ALIGNED_BSS
1902 ASM_OUTPUT_ALIGNED_BSS (asm_out_file, decl, name, size, DECL_ALIGN (decl));
1905 ASM_OUTPUT_BSS (asm_out_file, decl, name, size, rounded);
1911 /* A noswitch_section_callback for comm_section. */
1914 emit_common (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_DECL_COMMON
1920 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, decl, name,
1921 size, DECL_ALIGN (decl));
1923 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1924 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, name, size, DECL_ALIGN (decl));
1927 ASM_OUTPUT_COMMON (asm_out_file, name, size, rounded);
1932 /* A noswitch_section_callback for tls_comm_section. */
1935 emit_tls_common (tree decl ATTRIBUTE_UNUSED,
1936 const char *name ATTRIBUTE_UNUSED,
1937 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1938 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1940 #ifdef ASM_OUTPUT_TLS_COMMON
1941 ASM_OUTPUT_TLS_COMMON (asm_out_file, decl, name, size);
1944 sorry ("thread-local COMMON data not implemented");
1949 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1950 NAME is the name of DECL's SYMBOL_REF. */
1953 assemble_noswitch_variable (tree decl, const char *name, section *sect)
1955 unsigned HOST_WIDE_INT size, rounded;
1957 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
1960 /* Don't allocate zero bytes of common,
1961 since that means "undefined external" in the linker. */
1965 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1966 so that each uninitialized object starts on such a boundary. */
1967 rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1;
1968 rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
1969 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
1971 if (!sect->noswitch.callback (decl, name, size, rounded)
1972 && (unsigned HOST_WIDE_INT) DECL_ALIGN_UNIT (decl) > rounded)
1973 warning (0, "requested alignment for %q+D is greater than "
1974 "implemented alignment of %wu", decl, rounded);
1977 /* A subroutine of assemble_variable. Output the label and contents of
1978 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1979 is as for assemble_variable. */
1982 assemble_variable_contents (tree decl, const char *name,
1983 bool dont_output_data)
1985 /* Do any machine/system dependent processing of the object. */
1986 #ifdef ASM_DECLARE_OBJECT_NAME
1987 last_assemble_variable_decl = decl;
1988 ASM_DECLARE_OBJECT_NAME (asm_out_file, name, decl);
1990 /* Standard thing is just output label for the object. */
1991 ASM_OUTPUT_LABEL (asm_out_file, name);
1992 #endif /* ASM_DECLARE_OBJECT_NAME */
1994 if (!dont_output_data)
1996 if (DECL_INITIAL (decl)
1997 && DECL_INITIAL (decl) != error_mark_node
1998 && !initializer_zerop (DECL_INITIAL (decl)))
1999 /* Output the actual data. */
2000 output_constant (DECL_INITIAL (decl),
2001 tree_low_cst (DECL_SIZE_UNIT (decl), 1),
2004 /* Leave space for it. */
2005 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl), 1));
2009 /* Initialize emulated tls object TO, which refers to TLS variable
2010 DECL and is initialized by PROXY. */
2013 default_emutls_var_init (tree to, tree decl, tree proxy)
2015 VEC(constructor_elt,gc) *v = VEC_alloc (constructor_elt, gc, 4);
2016 constructor_elt *elt;
2017 tree type = TREE_TYPE (to);
2018 tree field = TYPE_FIELDS (type);
2020 elt = VEC_quick_push (constructor_elt, v, NULL);
2022 elt->value = fold_convert (TREE_TYPE (field), DECL_SIZE_UNIT (decl));
2024 elt = VEC_quick_push (constructor_elt, v, NULL);
2025 field = TREE_CHAIN (field);
2027 elt->value = build_int_cst (TREE_TYPE (field),
2028 DECL_ALIGN_UNIT (decl));
2030 elt = VEC_quick_push (constructor_elt, v, NULL);
2031 field = TREE_CHAIN (field);
2033 elt->value = null_pointer_node;
2035 elt = VEC_quick_push (constructor_elt, v, NULL);
2036 field = TREE_CHAIN (field);
2040 return build_constructor (type, v);
2043 /* Assemble everything that is needed for a variable or function declaration.
2044 Not used for automatic variables, and not used for function definitions.
2045 Should not be called for variables of incomplete structure type.
2047 TOP_LEVEL is nonzero if this variable has file scope.
2048 AT_END is nonzero if this is the special handling, at end of compilation,
2049 to define things that have had only tentative definitions.
2050 DONT_OUTPUT_DATA if nonzero means don't actually output the
2051 initial value (that will be done by the caller). */
2054 assemble_variable (tree decl, int top_level ATTRIBUTE_UNUSED,
2055 int at_end ATTRIBUTE_UNUSED, int dont_output_data)
2058 rtx decl_rtl, symbol;
2061 if (! targetm.have_tls
2062 && TREE_CODE (decl) == VAR_DECL
2063 && DECL_THREAD_LOCAL_P (decl))
2065 tree to = emutls_decl (decl);
2067 /* If this variable is defined locally, then we need to initialize the
2068 control structure with size and alignment information. We do this
2069 at the last moment because tentative definitions can take a locally
2070 defined but uninitialized variable and initialize it later, which
2071 would result in incorrect contents. */
2072 if (! DECL_EXTERNAL (to)
2073 && (! DECL_COMMON (to)
2074 || (DECL_INITIAL (decl)
2075 && DECL_INITIAL (decl) != error_mark_node)))
2077 DECL_INITIAL (to) = targetm.emutls.var_init
2078 (to, decl, get_emutls_init_templ_addr (decl));
2080 /* Make sure the template is marked as needed early enough.
2081 Without this, if the variable is placed in a
2082 section-anchored block, the template will only be marked
2083 when it's too late. */
2084 record_references_in_initializer (to);
2090 last_assemble_variable_decl = 0;
2092 /* Normally no need to say anything here for external references,
2093 since assemble_external is called by the language-specific code
2094 when a declaration is first seen. */
2096 if (DECL_EXTERNAL (decl))
2099 /* Output no assembler code for a function declaration.
2100 Only definitions of functions output anything. */
2102 if (TREE_CODE (decl) == FUNCTION_DECL)
2105 /* Do nothing for global register variables. */
2106 if (DECL_RTL_SET_P (decl) && REG_P (DECL_RTL (decl)))
2108 TREE_ASM_WRITTEN (decl) = 1;
2112 /* If type was incomplete when the variable was declared,
2113 see if it is complete now. */
2115 if (DECL_SIZE (decl) == 0)
2116 layout_decl (decl, 0);
2118 /* Still incomplete => don't allocate it; treat the tentative defn
2119 (which is what it must have been) as an `extern' reference. */
2121 if (!dont_output_data && DECL_SIZE (decl) == 0)
2123 error ("storage size of %q+D isn%'t known", decl);
2124 TREE_ASM_WRITTEN (decl) = 1;
2128 /* The first declaration of a variable that comes through this function
2129 decides whether it is global (in C, has external linkage)
2130 or local (in C, has internal linkage). So do nothing more
2131 if this function has already run. */
2133 if (TREE_ASM_WRITTEN (decl))
2136 /* Make sure targetm.encode_section_info is invoked before we set
2138 decl_rtl = DECL_RTL (decl);
2140 TREE_ASM_WRITTEN (decl) = 1;
2142 /* Do no output if -fsyntax-only. */
2143 if (flag_syntax_only)
2148 if (! dont_output_data
2149 && ! host_integerp (DECL_SIZE_UNIT (decl), 1))
2151 error ("size of variable %q+D is too large", decl);
2155 gcc_assert (MEM_P (decl_rtl));
2156 gcc_assert (GET_CODE (XEXP (decl_rtl, 0)) == SYMBOL_REF);
2157 symbol = XEXP (decl_rtl, 0);
2158 name = XSTR (symbol, 0);
2159 if (TREE_PUBLIC (decl) && DECL_NAME (decl))
2160 notice_global_symbol (decl);
2162 /* Compute the alignment of this data. */
2164 align_variable (decl, dont_output_data);
2165 set_mem_align (decl_rtl, DECL_ALIGN (decl));
2167 if (TREE_PUBLIC (decl))
2168 maybe_assemble_visibility (decl);
2170 if (DECL_PRESERVE_P (decl))
2171 targetm.asm_out.mark_decl_preserved (name);
2173 /* First make the assembler name(s) global if appropriate. */
2174 sect = get_variable_section (decl, false);
2175 if (TREE_PUBLIC (decl)
2176 && (sect->common.flags & SECTION_COMMON) == 0)
2177 globalize_decl (decl);
2179 /* Output any data that we will need to use the address of. */
2180 if (DECL_INITIAL (decl) && DECL_INITIAL (decl) != error_mark_node)
2181 output_addressed_constants (DECL_INITIAL (decl));
2183 /* dbxout.c needs to know this. */
2184 if (sect && (sect->common.flags & SECTION_CODE) != 0)
2185 DECL_IN_TEXT_SECTION (decl) = 1;
2187 /* If the decl is part of an object_block, make sure that the decl
2188 has been positioned within its block, but do not write out its
2189 definition yet. output_object_blocks will do that later. */
2190 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
2192 gcc_assert (!dont_output_data);
2193 place_block_symbol (symbol);
2195 else if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
2196 assemble_noswitch_variable (decl, name, sect);
2199 switch_to_section (sect);
2200 if (DECL_ALIGN (decl) > BITS_PER_UNIT)
2201 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (DECL_ALIGN_UNIT (decl)));
2202 assemble_variable_contents (decl, name, dont_output_data);
2206 /* Return 1 if type TYPE contains any pointers. */
2209 contains_pointers_p (tree type)
2211 switch (TREE_CODE (type))
2214 case REFERENCE_TYPE:
2215 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2216 so I'll play safe and return 1. */
2222 case QUAL_UNION_TYPE:
2225 /* For a type that has fields, see if the fields have pointers. */
2226 for (fields = TYPE_FIELDS (type); fields; fields = TREE_CHAIN (fields))
2227 if (TREE_CODE (fields) == FIELD_DECL
2228 && contains_pointers_p (TREE_TYPE (fields)))
2234 /* An array type contains pointers if its element type does. */
2235 return contains_pointers_p (TREE_TYPE (type));
2242 /* We delay assemble_external processing until
2243 the compilation unit is finalized. This is the best we can do for
2244 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2245 it all the way to final. See PR 17982 for further discussion. */
2246 static GTY(()) tree pending_assemble_externals;
2248 #ifdef ASM_OUTPUT_EXTERNAL
2249 /* True if DECL is a function decl for which no out-of-line copy exists.
2250 It is assumed that DECL's assembler name has been set. */
2253 incorporeal_function_p (tree decl)
2255 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
2259 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL
2260 && DECL_FUNCTION_CODE (decl) == BUILT_IN_ALLOCA)
2263 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
2264 if (is_builtin_name (name))
2270 /* Actually do the tests to determine if this is necessary, and invoke
2271 ASM_OUTPUT_EXTERNAL. */
2273 assemble_external_real (tree decl)
2275 rtx rtl = DECL_RTL (decl);
2277 if (MEM_P (rtl) && GET_CODE (XEXP (rtl, 0)) == SYMBOL_REF
2278 && !SYMBOL_REF_USED (XEXP (rtl, 0))
2279 && !incorporeal_function_p (decl))
2281 /* Some systems do require some output. */
2282 SYMBOL_REF_USED (XEXP (rtl, 0)) = 1;
2283 ASM_OUTPUT_EXTERNAL (asm_out_file, decl, XSTR (XEXP (rtl, 0), 0));
2289 process_pending_assemble_externals (void)
2291 #ifdef ASM_OUTPUT_EXTERNAL
2293 for (list = pending_assemble_externals; list; list = TREE_CHAIN (list))
2294 assemble_external_real (TREE_VALUE (list));
2296 pending_assemble_externals = 0;
2300 /* This TREE_LIST contains any weak symbol declarations waiting
2302 static GTY(()) tree weak_decls;
2304 /* Output something to declare an external symbol to the assembler,
2305 and qualifiers such as weakness. (Most assemblers don't need
2306 extern declaration, so we normally output nothing.) Do nothing if
2307 DECL is not external. */
2310 assemble_external (tree decl ATTRIBUTE_UNUSED)
2312 /* Because most platforms do not define ASM_OUTPUT_EXTERNAL, the
2313 main body of this code is only rarely exercised. To provide some
2314 testing, on all platforms, we make sure that the ASM_OUT_FILE is
2315 open. If it's not, we should not be calling this function. */
2316 gcc_assert (asm_out_file);
2318 if (!DECL_P (decl) || !DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl))
2321 /* We want to output annotation for weak and external symbols at
2322 very last to check if they are references or not. */
2324 if (SUPPORTS_WEAK && DECL_WEAK (decl)
2325 /* TREE_STATIC is a weird and abused creature which is not
2326 generally the right test for whether an entity has been
2327 locally emitted, inlined or otherwise not-really-extern, but
2328 for declarations that can be weak, it happens to be
2330 && !TREE_STATIC (decl)
2331 && tree_find_value (weak_decls, decl) == NULL_TREE)
2332 weak_decls = tree_cons (NULL, decl, weak_decls);
2334 #ifdef ASM_OUTPUT_EXTERNAL
2335 if (tree_find_value (pending_assemble_externals, decl) == NULL_TREE)
2336 pending_assemble_externals = tree_cons (NULL, decl,
2337 pending_assemble_externals);
2341 /* Similar, for calling a library function FUN. */
2344 assemble_external_libcall (rtx fun)
2346 /* Declare library function name external when first used, if nec. */
2347 if (! SYMBOL_REF_USED (fun))
2349 SYMBOL_REF_USED (fun) = 1;
2350 targetm.asm_out.external_libcall (fun);
2354 /* Assemble a label named NAME. */
2357 assemble_label (const char *name)
2359 ASM_OUTPUT_LABEL (asm_out_file, name);
2362 /* Set the symbol_referenced flag for ID. */
2364 mark_referenced (tree id)
2366 TREE_SYMBOL_REFERENCED (id) = 1;
2369 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2371 mark_decl_referenced (tree decl)
2373 if (TREE_CODE (decl) == FUNCTION_DECL)
2375 /* Extern inline functions don't become needed when referenced.
2376 If we know a method will be emitted in other TU and no new
2377 functions can be marked reachable, just use the external
2379 struct cgraph_node *node = cgraph_node (decl);
2380 if (!DECL_EXTERNAL (decl)
2381 && (!node->local.vtable_method || !cgraph_global_info_ready
2382 || !node->local.finalized))
2383 cgraph_mark_needed_node (node);
2385 else if (TREE_CODE (decl) == VAR_DECL)
2387 struct varpool_node *node = varpool_node (decl);
2388 varpool_mark_needed_node (node);
2389 /* C++ frontend use mark_decl_references to force COMDAT variables
2390 to be output that might appear dead otherwise. */
2391 node->force_output = true;
2393 /* else do nothing - we can get various sorts of CST nodes here,
2394 which do not need to be marked. */
2398 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2399 until we find an identifier that is not itself a transparent alias.
2400 Modify the alias passed to it by reference (and all aliases on the
2401 way to the ultimate target), such that they do not have to be
2402 followed again, and return the ultimate target of the alias
2406 ultimate_transparent_alias_target (tree *alias)
2408 tree target = *alias;
2410 if (IDENTIFIER_TRANSPARENT_ALIAS (target))
2412 gcc_assert (TREE_CHAIN (target));
2413 target = ultimate_transparent_alias_target (&TREE_CHAIN (target));
2414 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target)
2415 && ! TREE_CHAIN (target));
2422 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2423 starts with a *, the rest of NAME is output verbatim. Otherwise
2424 NAME is transformed in a target-specific way (usually by the
2425 addition of an underscore). */
2428 assemble_name_raw (FILE *file, const char *name)
2431 fputs (&name[1], file);
2433 ASM_OUTPUT_LABELREF (file, name);
2436 /* Like assemble_name_raw, but should be used when NAME might refer to
2437 an entity that is also represented as a tree (like a function or
2438 variable). If NAME does refer to such an entity, that entity will
2439 be marked as referenced. */
2442 assemble_name (FILE *file, const char *name)
2444 const char *real_name;
2447 real_name = targetm.strip_name_encoding (name);
2449 id = maybe_get_identifier (real_name);
2454 mark_referenced (id);
2455 ultimate_transparent_alias_target (&id);
2457 name = IDENTIFIER_POINTER (id);
2458 gcc_assert (! TREE_CHAIN (id));
2461 assemble_name_raw (file, name);
2464 /* Allocate SIZE bytes writable static space with a gensym name
2465 and return an RTX to refer to its address. */
2468 assemble_static_space (unsigned HOST_WIDE_INT size)
2471 const char *namestring;
2474 ASM_GENERATE_INTERNAL_LABEL (name, "LF", const_labelno);
2476 namestring = ggc_strdup (name);
2478 x = gen_rtx_SYMBOL_REF (Pmode, namestring);
2479 SYMBOL_REF_FLAGS (x) = SYMBOL_FLAG_LOCAL;
2481 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2482 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, NULL_TREE, name, size,
2485 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2486 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, BIGGEST_ALIGNMENT);
2489 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2490 so that each uninitialized object starts on such a boundary. */
2491 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2492 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2493 = ((size + (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1)
2494 / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
2495 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
2496 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
2503 /* Assemble the static constant template for function entry trampolines.
2504 This is done at most once per compilation.
2505 Returns an RTX for the address of the template. */
2507 static GTY(()) rtx initial_trampoline;
2509 #ifdef TRAMPOLINE_TEMPLATE
2511 assemble_trampoline_template (void)
2518 if (initial_trampoline)
2519 return initial_trampoline;
2521 /* By default, put trampoline templates in read-only data section. */
2523 #ifdef TRAMPOLINE_SECTION
2524 switch_to_section (TRAMPOLINE_SECTION);
2526 switch_to_section (readonly_data_section);
2529 /* Write the assembler code to define one. */
2530 align = floor_log2 (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT);
2533 ASM_OUTPUT_ALIGN (asm_out_file, align);
2536 targetm.asm_out.internal_label (asm_out_file, "LTRAMP", 0);
2537 TRAMPOLINE_TEMPLATE (asm_out_file);
2539 /* Record the rtl to refer to it. */
2540 ASM_GENERATE_INTERNAL_LABEL (label, "LTRAMP", 0);
2541 name = ggc_strdup (label);
2542 symbol = gen_rtx_SYMBOL_REF (Pmode, name);
2543 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_LOCAL;
2545 initial_trampoline = gen_rtx_MEM (BLKmode, symbol);
2546 set_mem_align (initial_trampoline, TRAMPOLINE_ALIGNMENT);
2548 return initial_trampoline;
2552 /* A and B are either alignments or offsets. Return the minimum alignment
2553 that may be assumed after adding the two together. */
2555 static inline unsigned
2556 min_align (unsigned int a, unsigned int b)
2558 return (a | b) & -(a | b);
2561 /* Return the assembler directive for creating a given kind of integer
2562 object. SIZE is the number of bytes in the object and ALIGNED_P
2563 indicates whether it is known to be aligned. Return NULL if the
2564 assembly dialect has no such directive.
2566 The returned string should be printed at the start of a new line and
2567 be followed immediately by the object's initial value. */
2570 integer_asm_op (int size, int aligned_p)
2572 struct asm_int_op *ops;
2575 ops = &targetm.asm_out.aligned_op;
2577 ops = &targetm.asm_out.unaligned_op;
2582 return targetm.asm_out.byte_op;
2596 /* Use directive OP to assemble an integer object X. Print OP at the
2597 start of the line, followed immediately by the value of X. */
2600 assemble_integer_with_op (const char *op, rtx x)
2602 fputs (op, asm_out_file);
2603 output_addr_const (asm_out_file, x);
2604 fputc ('\n', asm_out_file);
2607 /* The default implementation of the asm_out.integer target hook. */
2610 default_assemble_integer (rtx x ATTRIBUTE_UNUSED,
2611 unsigned int size ATTRIBUTE_UNUSED,
2612 int aligned_p ATTRIBUTE_UNUSED)
2614 const char *op = integer_asm_op (size, aligned_p);
2615 /* Avoid GAS bugs for large values. Specifically negative values whose
2616 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2617 if (size > UNITS_PER_WORD && size > POINTER_SIZE / BITS_PER_UNIT)
2619 return op && (assemble_integer_with_op (op, x), true);
2622 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2623 the alignment of the integer in bits. Return 1 if we were able to output
2624 the constant, otherwise 0. We must be able to output the constant,
2625 if FORCE is nonzero. */
2628 assemble_integer (rtx x, unsigned int size, unsigned int align, int force)
2632 aligned_p = (align >= MIN (size * BITS_PER_UNIT, BIGGEST_ALIGNMENT));
2634 /* See if the target hook can handle this kind of object. */
2635 if (targetm.asm_out.integer (x, size, aligned_p))
2638 /* If the object is a multi-byte one, try splitting it up. Split
2639 it into words it if is multi-word, otherwise split it into bytes. */
2642 enum machine_mode omode, imode;
2643 unsigned int subalign;
2644 unsigned int subsize, i;
2645 enum mode_class mclass;
2647 subsize = size > UNITS_PER_WORD? UNITS_PER_WORD : 1;
2648 subalign = MIN (align, subsize * BITS_PER_UNIT);
2649 if (GET_CODE (x) == CONST_FIXED)
2650 mclass = GET_MODE_CLASS (GET_MODE (x));
2654 omode = mode_for_size (subsize * BITS_PER_UNIT, mclass, 0);
2655 imode = mode_for_size (size * BITS_PER_UNIT, mclass, 0);
2657 for (i = 0; i < size; i += subsize)
2659 rtx partial = simplify_subreg (omode, x, imode, i);
2660 if (!partial || !assemble_integer (partial, subsize, subalign, 0))
2666 /* If we've printed some of it, but not all of it, there's no going
2671 gcc_assert (!force);
2677 assemble_real (REAL_VALUE_TYPE d, enum machine_mode mode, unsigned int align)
2679 long data[4] = {0, 0, 0, 0};
2681 int bitsize, nelts, nunits, units_per;
2683 /* This is hairy. We have a quantity of known size. real_to_target
2684 will put it into an array of *host* longs, 32 bits per element
2685 (even if long is more than 32 bits). We need to determine the
2686 number of array elements that are occupied (nelts) and the number
2687 of *target* min-addressable units that will be occupied in the
2688 object file (nunits). We cannot assume that 32 divides the
2689 mode's bitsize (size * BITS_PER_UNIT) evenly.
2691 size * BITS_PER_UNIT is used here to make sure that padding bits
2692 (which might appear at either end of the value; real_to_target
2693 will include the padding bits in its output array) are included. */
2695 nunits = GET_MODE_SIZE (mode);
2696 bitsize = nunits * BITS_PER_UNIT;
2697 nelts = CEIL (bitsize, 32);
2698 units_per = 32 / BITS_PER_UNIT;
2700 real_to_target (data, &d, mode);
2702 /* Put out the first word with the specified alignment. */
2703 assemble_integer (GEN_INT (data[0]), MIN (nunits, units_per), align, 1);
2704 nunits -= units_per;
2706 /* Subsequent words need only 32-bit alignment. */
2707 align = min_align (align, 32);
2709 for (i = 1; i < nelts; i++)
2711 assemble_integer (GEN_INT (data[i]), MIN (nunits, units_per), align, 1);
2712 nunits -= units_per;
2716 /* Given an expression EXP with a constant value,
2717 reduce it to the sum of an assembler symbol and an integer.
2718 Store them both in the structure *VALUE.
2719 EXP must be reducible. */
2721 struct GTY(()) addr_const {
2723 HOST_WIDE_INT offset;
2727 decode_addr_const (tree exp, struct addr_const *value)
2729 tree target = TREE_OPERAND (exp, 0);
2735 if (TREE_CODE (target) == COMPONENT_REF
2736 && host_integerp (byte_position (TREE_OPERAND (target, 1)), 0))
2739 offset += int_byte_position (TREE_OPERAND (target, 1));
2740 target = TREE_OPERAND (target, 0);
2742 else if (TREE_CODE (target) == ARRAY_REF
2743 || TREE_CODE (target) == ARRAY_RANGE_REF)
2745 offset += (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target)), 1)
2746 * tree_low_cst (TREE_OPERAND (target, 1), 0));
2747 target = TREE_OPERAND (target, 0);
2753 switch (TREE_CODE (target))
2757 x = DECL_RTL (target);
2761 x = gen_rtx_MEM (FUNCTION_MODE,
2762 gen_rtx_LABEL_REF (Pmode, force_label_rtx (target)));
2771 x = output_constant_def (target, 1);
2778 gcc_assert (MEM_P (x));
2782 value->offset = offset;
2785 /* Uniquize all constants that appear in memory.
2786 Each constant in memory thus far output is recorded
2787 in `const_desc_table'. */
2789 struct GTY(()) constant_descriptor_tree {
2790 /* A MEM for the constant. */
2793 /* The value of the constant. */
2796 /* Hash of value. Computing the hash from value each time
2797 hashfn is called can't work properly, as that means recursive
2798 use of the hash table during hash table expansion. */
2802 static GTY((param_is (struct constant_descriptor_tree)))
2803 htab_t const_desc_htab;
2805 static struct constant_descriptor_tree * build_constant_desc (tree);
2806 static void maybe_output_constant_def_contents (struct constant_descriptor_tree *, int);
2808 /* Compute a hash code for a constant expression. */
2811 const_desc_hash (const void *ptr)
2813 return ((const struct constant_descriptor_tree *)ptr)->hash;
2817 const_hash_1 (const tree exp)
2822 enum tree_code code = TREE_CODE (exp);
2824 /* Either set P and LEN to the address and len of something to hash and
2825 exit the switch or return a value. */
2830 p = (char *) &TREE_INT_CST (exp);
2831 len = sizeof TREE_INT_CST (exp);
2835 return real_hash (TREE_REAL_CST_PTR (exp));
2838 return fixed_hash (TREE_FIXED_CST_PTR (exp));
2841 p = TREE_STRING_POINTER (exp);
2842 len = TREE_STRING_LENGTH (exp);
2846 return (const_hash_1 (TREE_REALPART (exp)) * 5
2847 + const_hash_1 (TREE_IMAGPART (exp)));
2851 unsigned HOST_WIDE_INT idx;
2854 hi = 5 + int_size_in_bytes (TREE_TYPE (exp));
2856 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, value)
2858 hi = hi * 603 + const_hash_1 (value);
2866 struct addr_const value;
2868 decode_addr_const (exp, &value);
2869 switch (GET_CODE (value.base))
2872 /* Don't hash the address of the SYMBOL_REF;
2873 only use the offset and the symbol name. */
2875 p = XSTR (value.base, 0);
2876 for (i = 0; p[i] != 0; i++)
2877 hi = ((hi * 613) + (unsigned) (p[i]));
2881 hi = value.offset + CODE_LABEL_NUMBER (XEXP (value.base, 0)) * 13;
2891 case POINTER_PLUS_EXPR:
2893 return (const_hash_1 (TREE_OPERAND (exp, 0)) * 9
2894 + const_hash_1 (TREE_OPERAND (exp, 1)));
2897 return const_hash_1 (TREE_OPERAND (exp, 0)) * 7 + 2;
2900 /* A language specific constant. Just hash the code. */
2904 /* Compute hashing function. */
2906 for (i = 0; i < len; i++)
2907 hi = ((hi * 613) + (unsigned) (p[i]));
2912 /* Wrapper of compare_constant, for the htab interface. */
2914 const_desc_eq (const void *p1, const void *p2)
2916 const struct constant_descriptor_tree *const c1
2917 = (const struct constant_descriptor_tree *) p1;
2918 const struct constant_descriptor_tree *const c2
2919 = (const struct constant_descriptor_tree *) p2;
2920 if (c1->hash != c2->hash)
2922 return compare_constant (c1->value, c2->value);
2925 /* Compare t1 and t2, and return 1 only if they are known to result in
2926 the same bit pattern on output. */
2929 compare_constant (const tree t1, const tree t2)
2931 enum tree_code typecode;
2933 if (t1 == NULL_TREE)
2934 return t2 == NULL_TREE;
2935 if (t2 == NULL_TREE)
2938 if (TREE_CODE (t1) != TREE_CODE (t2))
2941 switch (TREE_CODE (t1))
2944 /* Integer constants are the same only if the same width of type. */
2945 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2947 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2949 return tree_int_cst_equal (t1, t2);
2952 /* Real constants are the same only if the same width of type. */
2953 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2956 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2));
2959 /* Fixed constants are the same only if the same width of type. */
2960 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2963 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1), TREE_FIXED_CST (t2));
2966 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2969 return (TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
2970 && ! memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
2971 TREE_STRING_LENGTH (t1)));
2974 return (compare_constant (TREE_REALPART (t1), TREE_REALPART (t2))
2975 && compare_constant (TREE_IMAGPART (t1), TREE_IMAGPART (t2)));
2979 VEC(constructor_elt, gc) *v1, *v2;
2980 unsigned HOST_WIDE_INT idx;
2982 typecode = TREE_CODE (TREE_TYPE (t1));
2983 if (typecode != TREE_CODE (TREE_TYPE (t2)))
2986 if (typecode == ARRAY_TYPE)
2988 HOST_WIDE_INT size_1 = int_size_in_bytes (TREE_TYPE (t1));
2989 /* For arrays, check that the sizes all match. */
2990 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2))
2992 || size_1 != int_size_in_bytes (TREE_TYPE (t2)))
2997 /* For record and union constructors, require exact type
2999 if (TREE_TYPE (t1) != TREE_TYPE (t2))
3003 v1 = CONSTRUCTOR_ELTS (t1);
3004 v2 = CONSTRUCTOR_ELTS (t2);
3005 if (VEC_length (constructor_elt, v1)
3006 != VEC_length (constructor_elt, v2))
3009 for (idx = 0; idx < VEC_length (constructor_elt, v1); ++idx)
3011 constructor_elt *c1 = VEC_index (constructor_elt, v1, idx);
3012 constructor_elt *c2 = VEC_index (constructor_elt, v2, idx);
3014 /* Check that each value is the same... */
3015 if (!compare_constant (c1->value, c2->value))
3017 /* ... and that they apply to the same fields! */
3018 if (typecode == ARRAY_TYPE)
3020 if (!compare_constant (c1->index, c2->index))
3025 if (c1->index != c2->index)
3036 struct addr_const value1, value2;
3038 decode_addr_const (t1, &value1);
3039 decode_addr_const (t2, &value2);
3040 return (value1.offset == value2.offset
3041 && strcmp (XSTR (value1.base, 0), XSTR (value2.base, 0)) == 0);
3045 case POINTER_PLUS_EXPR:
3048 return (compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0))
3049 && compare_constant(TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1)));
3052 case VIEW_CONVERT_EXPR:
3053 return compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3062 /* Make a copy of the whole tree structure for a constant. This
3063 handles the same types of nodes that compare_constant handles. */
3066 copy_constant (tree exp)
3068 switch (TREE_CODE (exp))
3071 /* For ADDR_EXPR, we do not want to copy the decl whose address
3072 is requested. We do want to copy constants though. */
3073 if (CONSTANT_CLASS_P (TREE_OPERAND (exp, 0)))
3074 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
3075 copy_constant (TREE_OPERAND (exp, 0)));
3077 return copy_node (exp);
3083 return copy_node (exp);
3086 return build_complex (TREE_TYPE (exp),
3087 copy_constant (TREE_REALPART (exp)),
3088 copy_constant (TREE_IMAGPART (exp)));
3091 case POINTER_PLUS_EXPR:
3093 return build2 (TREE_CODE (exp), TREE_TYPE (exp),
3094 copy_constant (TREE_OPERAND (exp, 0)),
3095 copy_constant (TREE_OPERAND (exp, 1)));
3098 case VIEW_CONVERT_EXPR:
3099 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
3100 copy_constant (TREE_OPERAND (exp, 0)));
3104 tree copy = copy_node (exp);
3105 VEC(constructor_elt, gc) *v;
3106 unsigned HOST_WIDE_INT idx;
3107 tree purpose, value;
3109 v = VEC_alloc(constructor_elt, gc, VEC_length(constructor_elt,
3110 CONSTRUCTOR_ELTS (exp)));
3111 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp), idx, purpose, value)
3113 constructor_elt *ce = VEC_quick_push (constructor_elt, v, NULL);
3114 ce->index = purpose;
3115 ce->value = copy_constant (value);
3117 CONSTRUCTOR_ELTS (copy) = v;
3126 /* Return the alignment of constant EXP in bits. */
3129 get_constant_alignment (tree exp)
3133 align = TYPE_ALIGN (TREE_TYPE (exp));
3134 #ifdef CONSTANT_ALIGNMENT
3135 align = CONSTANT_ALIGNMENT (exp, align);
3140 /* Return the section into which constant EXP should be placed. */
3143 get_constant_section (tree exp)
3145 if (IN_NAMED_SECTION (exp))
3146 return get_named_section (exp, NULL, compute_reloc_for_constant (exp));
3148 return targetm.asm_out.select_section (exp,
3149 compute_reloc_for_constant (exp),
3150 get_constant_alignment (exp));
3153 /* Return the size of constant EXP in bytes. */
3155 static HOST_WIDE_INT
3156 get_constant_size (tree exp)
3160 size = int_size_in_bytes (TREE_TYPE (exp));
3161 if (TREE_CODE (exp) == STRING_CST)
3162 size = MAX (TREE_STRING_LENGTH (exp), size);
3166 /* Subroutine of output_constant_def:
3167 No constant equal to EXP is known to have been output.
3168 Make a constant descriptor to enter EXP in the hash table.
3169 Assign the label number and construct RTL to refer to the
3170 constant's location in memory.
3171 Caller is responsible for updating the hash table. */
3173 static struct constant_descriptor_tree *
3174 build_constant_desc (tree exp)
3180 struct constant_descriptor_tree *desc;
3182 desc = GGC_NEW (struct constant_descriptor_tree);
3183 desc->value = copy_constant (exp);
3185 /* Propagate marked-ness to copied constant. */
3186 if (flag_mudflap && mf_marked_p (exp))
3187 mf_mark (desc->value);
3189 /* Create a string containing the label name, in LABEL. */
3190 labelno = const_labelno++;
3191 ASM_GENERATE_INTERNAL_LABEL (label, "LC", labelno);
3193 /* We have a symbol name; construct the SYMBOL_REF and the MEM. */
3194 if (use_object_blocks_p ())
3196 section *sect = get_constant_section (exp);
3197 symbol = create_block_symbol (ggc_strdup (label),
3198 get_block_for_section (sect), -1);
3201 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3202 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3203 SET_SYMBOL_REF_DECL (symbol, desc->value);
3204 TREE_CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3206 rtl = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), symbol);
3207 set_mem_attributes (rtl, exp, 1);
3208 set_mem_alias_set (rtl, 0);
3209 set_mem_alias_set (rtl, const_alias_set);
3211 /* We cannot share RTX'es in pool entries.
3212 Mark this piece of RTL as required for unsharing. */
3213 RTX_FLAG (rtl, used) = 1;
3215 /* Set flags or add text to the name to record information, such as
3216 that it is a local symbol. If the name is changed, the macro
3217 ASM_OUTPUT_LABELREF will have to know how to strip this
3218 information. This call might invalidate our local variable
3219 SYMBOL; we can't use it afterward. */
3221 targetm.encode_section_info (exp, rtl, true);
3228 /* Return an rtx representing a reference to constant data in memory
3229 for the constant expression EXP.
3231 If assembler code for such a constant has already been output,
3232 return an rtx to refer to it.
3233 Otherwise, output such a constant in memory
3234 and generate an rtx for it.
3236 If DEFER is nonzero, this constant can be deferred and output only
3237 if referenced in the function after all optimizations.
3239 `const_desc_table' records which constants already have label strings. */
3242 output_constant_def (tree exp, int defer)
3244 struct constant_descriptor_tree *desc;
3245 struct constant_descriptor_tree key;
3248 /* Look up EXP in the table of constant descriptors. If we didn't find
3249 it, create a new one. */
3251 key.hash = const_hash_1 (exp);
3252 loc = htab_find_slot_with_hash (const_desc_htab, &key, key.hash, INSERT);
3254 desc = (struct constant_descriptor_tree *) *loc;
3257 desc = build_constant_desc (exp);
3258 desc->hash = key.hash;
3262 maybe_output_constant_def_contents (desc, defer);
3266 /* Subroutine of output_constant_def: Decide whether or not we need to
3267 output the constant DESC now, and if so, do it. */
3269 maybe_output_constant_def_contents (struct constant_descriptor_tree *desc,
3272 rtx symbol = XEXP (desc->rtl, 0);
3273 tree exp = desc->value;
3275 if (flag_syntax_only)
3278 if (TREE_ASM_WRITTEN (exp))
3279 /* Already output; don't do it again. */
3282 /* We can always defer constants as long as the context allows
3286 /* Increment n_deferred_constants if it exists. It needs to be at
3287 least as large as the number of constants actually referred to
3288 by the function. If it's too small we'll stop looking too early
3289 and fail to emit constants; if it's too large we'll only look
3290 through the entire function when we could have stopped earlier. */
3292 n_deferred_constants++;
3296 output_constant_def_contents (symbol);
3299 /* Subroutine of output_constant_def_contents. Output the definition
3300 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3301 constant's alignment in bits. */
3304 assemble_constant_contents (tree exp, const char *label, unsigned int align)
3308 size = get_constant_size (exp);
3310 /* Do any machine/system dependent processing of the constant. */
3311 #ifdef ASM_DECLARE_CONSTANT_NAME
3312 ASM_DECLARE_CONSTANT_NAME (asm_out_file, label, exp, size);
3314 /* Standard thing is just output label for the constant. */
3315 ASM_OUTPUT_LABEL (asm_out_file, label);
3316 #endif /* ASM_DECLARE_CONSTANT_NAME */
3318 /* Output the value of EXP. */
3319 output_constant (exp, size, align);
3322 /* We must output the constant data referred to by SYMBOL; do so. */
3325 output_constant_def_contents (rtx symbol)
3327 tree exp = SYMBOL_REF_DECL (symbol);
3330 /* Make sure any other constants whose addresses appear in EXP
3331 are assigned label numbers. */
3332 output_addressed_constants (exp);
3334 /* We are no longer deferring this constant. */
3335 TREE_ASM_WRITTEN (exp) = 1;
3337 /* If the constant is part of an object block, make sure that the
3338 decl has been positioned within its block, but do not write out
3339 its definition yet. output_object_blocks will do that later. */
3340 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
3341 place_block_symbol (symbol);
3344 switch_to_section (get_constant_section (exp));
3345 align = get_constant_alignment (exp);
3346 if (align > BITS_PER_UNIT)
3347 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
3348 assemble_constant_contents (exp, XSTR (symbol, 0), align);
3351 mudflap_enqueue_constant (exp);
3354 /* Look up EXP in the table of constant descriptors. Return the rtl
3355 if it has been emitted, else null. */
3358 lookup_constant_def (tree exp)
3360 struct constant_descriptor_tree *desc;
3361 struct constant_descriptor_tree key;
3364 key.hash = const_hash_1 (exp);
3365 desc = (struct constant_descriptor_tree *)
3366 htab_find_with_hash (const_desc_htab, &key, key.hash);
3368 return (desc ? desc->rtl : NULL_RTX);
3371 /* Used in the hash tables to avoid outputting the same constant
3372 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3373 are output once per function, not once per file. */
3374 /* ??? Only a few targets need per-function constant pools. Most
3375 can use one per-file pool. Should add a targetm bit to tell the
3378 struct GTY(()) rtx_constant_pool {
3379 /* Pointers to first and last constant in pool, as ordered by offset. */
3380 struct constant_descriptor_rtx *first;
3381 struct constant_descriptor_rtx *last;
3383 /* Hash facility for making memory-constants from constant rtl-expressions.
3384 It is used on RISC machines where immediate integer arguments and
3385 constant addresses are restricted so that such constants must be stored
3387 htab_t GTY((param_is (struct constant_descriptor_rtx))) const_rtx_htab;
3389 /* Current offset in constant pool (does not include any
3390 machine-specific header). */
3391 HOST_WIDE_INT offset;
3394 struct GTY((chain_next ("%h.next"))) constant_descriptor_rtx {
3395 struct constant_descriptor_rtx *next;
3399 HOST_WIDE_INT offset;
3401 enum machine_mode mode;
3407 /* Hash and compare functions for const_rtx_htab. */
3410 const_desc_rtx_hash (const void *ptr)
3412 const struct constant_descriptor_rtx *const desc
3413 = (const struct constant_descriptor_rtx *) ptr;
3418 const_desc_rtx_eq (const void *a, const void *b)
3420 const struct constant_descriptor_rtx *const x
3421 = (const struct constant_descriptor_rtx *) a;
3422 const struct constant_descriptor_rtx *const y
3423 = (const struct constant_descriptor_rtx *) b;
3425 if (x->mode != y->mode)
3427 return rtx_equal_p (x->constant, y->constant);
3430 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3433 const_rtx_hash_1 (rtx *xp, void *data)
3435 unsigned HOST_WIDE_INT hwi;
3436 enum machine_mode mode;
3442 code = GET_CODE (x);
3443 mode = GET_MODE (x);
3444 h = (hashval_t) code * 1048573 + mode;
3452 int shift = sizeof (hashval_t) * CHAR_BIT;
3453 const int n = sizeof (HOST_WIDE_INT) / sizeof (hashval_t);
3456 h ^= (hashval_t) hwi;
3457 for (i = 1; i < n; ++i)
3460 h ^= (hashval_t) hwi;
3466 if (mode == VOIDmode)
3468 hwi = CONST_DOUBLE_LOW (x) ^ CONST_DOUBLE_HIGH (x);
3472 h ^= real_hash (CONST_DOUBLE_REAL_VALUE (x));
3476 h ^= fixed_hash (CONST_FIXED_VALUE (x));
3482 for (i = XVECLEN (x, 0); i-- > 0; )
3483 h = h * 251 + const_rtx_hash_1 (&XVECEXP (x, 0, i), data);
3488 h ^= htab_hash_string (XSTR (x, 0));
3492 h = h * 251 + CODE_LABEL_NUMBER (XEXP (x, 0));
3496 case UNSPEC_VOLATILE:
3497 h = h * 251 + XINT (x, 1);
3504 hp = (hashval_t *) data;
3505 *hp = *hp * 509 + h;
3509 /* Compute a hash value for X, which should be a constant. */
3512 const_rtx_hash (rtx x)
3515 for_each_rtx (&x, const_rtx_hash_1, &h);
3520 /* Create and return a new rtx constant pool. */
3522 static struct rtx_constant_pool *
3523 create_constant_pool (void)
3525 struct rtx_constant_pool *pool;
3527 pool = GGC_NEW (struct rtx_constant_pool);
3528 pool->const_rtx_htab = htab_create_ggc (31, const_desc_rtx_hash,
3529 const_desc_rtx_eq, NULL);
3536 /* Initialize constant pool hashing for a new function. */
3539 init_varasm_status (void)
3541 crtl->varasm.pool = create_constant_pool ();
3542 crtl->varasm.deferred_constants = 0;
3545 /* Given a MINUS expression, simplify it if both sides
3546 include the same symbol. */
3549 simplify_subtraction (rtx x)
3551 rtx r = simplify_rtx (x);
3555 /* Given a constant rtx X, make (or find) a memory constant for its value
3556 and return a MEM rtx to refer to it in memory. */
3559 force_const_mem (enum machine_mode mode, rtx x)
3561 struct constant_descriptor_rtx *desc, tmp;
3562 struct rtx_constant_pool *pool;
3569 /* If we're not allowed to drop X into the constant pool, don't. */
3570 if (targetm.cannot_force_const_mem (x))
3573 /* Record that this function has used a constant pool entry. */
3574 crtl->uses_const_pool = 1;
3576 /* Decide which pool to use. */
3577 pool = (targetm.use_blocks_for_constant_p (mode, x)
3578 ? shared_constant_pool
3579 : crtl->varasm.pool);
3581 /* Lookup the value in the hashtable. */
3584 hash = const_rtx_hash (x);
3585 slot = htab_find_slot_with_hash (pool->const_rtx_htab, &tmp, hash, INSERT);
3586 desc = (struct constant_descriptor_rtx *) *slot;
3588 /* If the constant was already present, return its memory. */
3590 return copy_rtx (desc->mem);
3592 /* Otherwise, create a new descriptor. */
3593 desc = GGC_NEW (struct constant_descriptor_rtx);
3596 /* Align the location counter as required by EXP's data type. */
3597 align = GET_MODE_ALIGNMENT (mode == VOIDmode ? word_mode : mode);
3598 #ifdef CONSTANT_ALIGNMENT
3600 tree type = lang_hooks.types.type_for_mode (mode, 0);
3601 if (type != NULL_TREE)
3602 align = CONSTANT_ALIGNMENT (make_tree (type, x), align);
3606 pool->offset += (align / BITS_PER_UNIT) - 1;
3607 pool->offset &= ~ ((align / BITS_PER_UNIT) - 1);
3610 desc->constant = tmp.constant;
3611 desc->offset = pool->offset;
3614 desc->align = align;
3615 desc->labelno = const_labelno;
3618 pool->offset += GET_MODE_SIZE (mode);
3620 pool->last->next = desc;
3622 pool->first = pool->last = desc;
3625 /* Create a string containing the label name, in LABEL. */
3626 ASM_GENERATE_INTERNAL_LABEL (label, "LC", const_labelno);
3629 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3630 the constants pool. */
3631 if (use_object_blocks_p () && targetm.use_blocks_for_constant_p (mode, x))
3633 section *sect = targetm.asm_out.select_rtx_section (mode, x, align);
3634 symbol = create_block_symbol (ggc_strdup (label),
3635 get_block_for_section (sect), -1);
3638 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3640 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3641 CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3642 SET_SYMBOL_REF_CONSTANT (symbol, desc);
3644 /* Construct the MEM. */
3645 desc->mem = def = gen_const_mem (mode, symbol);
3646 set_mem_attributes (def, lang_hooks.types.type_for_mode (mode, 0), 1);
3647 set_mem_align (def, align);
3649 /* If we're dropping a label to the constant pool, make sure we
3651 if (GET_CODE (x) == LABEL_REF)
3652 LABEL_PRESERVE_P (XEXP (x, 0)) = 1;
3654 return copy_rtx (def);
3657 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3660 get_pool_constant (rtx addr)
3662 return SYMBOL_REF_CONSTANT (addr)->constant;
3665 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3666 and whether it has been output or not. */
3669 get_pool_constant_mark (rtx addr, bool *pmarked)
3671 struct constant_descriptor_rtx *desc;
3673 desc = SYMBOL_REF_CONSTANT (addr);
3674 *pmarked = (desc->mark != 0);
3675 return desc->constant;
3678 /* Similar, return the mode. */
3681 get_pool_mode (const_rtx addr)
3683 return SYMBOL_REF_CONSTANT (addr)->mode;
3686 /* Return the size of the constant pool. */
3689 get_pool_size (void)
3691 return crtl->varasm.pool->offset;
3694 /* Worker function for output_constant_pool_1. Emit assembly for X
3695 in MODE with known alignment ALIGN. */
3698 output_constant_pool_2 (enum machine_mode mode, rtx x, unsigned int align)
3700 switch (GET_MODE_CLASS (mode))
3703 case MODE_DECIMAL_FLOAT:
3707 gcc_assert (GET_CODE (x) == CONST_DOUBLE);
3708 REAL_VALUE_FROM_CONST_DOUBLE (r, x);
3709 assemble_real (r, mode, align);
3714 case MODE_PARTIAL_INT:
3719 assemble_integer (x, GET_MODE_SIZE (mode), align, 1);
3722 case MODE_VECTOR_FLOAT:
3723 case MODE_VECTOR_INT:
3724 case MODE_VECTOR_FRACT:
3725 case MODE_VECTOR_UFRACT:
3726 case MODE_VECTOR_ACCUM:
3727 case MODE_VECTOR_UACCUM:
3730 enum machine_mode submode = GET_MODE_INNER (mode);
3731 unsigned int subalign = MIN (align, GET_MODE_BITSIZE (submode));
3733 gcc_assert (GET_CODE (x) == CONST_VECTOR);
3734 units = CONST_VECTOR_NUNITS (x);
3736 for (i = 0; i < units; i++)
3738 rtx elt = CONST_VECTOR_ELT (x, i);
3739 output_constant_pool_2 (submode, elt, i ? subalign : align);
3749 /* Worker function for output_constant_pool. Emit constant DESC,
3750 giving it ALIGN bits of alignment. */
3753 output_constant_pool_1 (struct constant_descriptor_rtx *desc,
3760 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3761 whose CODE_LABEL has been deleted. This can occur if a jump table
3762 is eliminated by optimization. If so, write a constant of zero
3763 instead. Note that this can also happen by turning the
3764 CODE_LABEL into a NOTE. */
3765 /* ??? This seems completely and utterly wrong. Certainly it's
3766 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3767 functioning even with INSN_DELETED_P and friends. */
3770 switch (GET_CODE (tmp))
3773 if (GET_CODE (XEXP (tmp, 0)) != PLUS
3774 || GET_CODE (XEXP (XEXP (tmp, 0), 0)) != LABEL_REF)
3776 tmp = XEXP (XEXP (tmp, 0), 0);
3780 tmp = XEXP (tmp, 0);
3781 gcc_assert (!INSN_DELETED_P (tmp));
3782 gcc_assert (!NOTE_P (tmp)
3783 || NOTE_KIND (tmp) != NOTE_INSN_DELETED);
3790 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3791 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file, x, desc->mode,
3792 align, desc->labelno, done);
3795 assemble_align (align);
3797 /* Output the label. */
3798 targetm.asm_out.internal_label (asm_out_file, "LC", desc->labelno);
3800 /* Output the data. */
3801 output_constant_pool_2 (desc->mode, x, align);
3803 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3804 sections have proper size. */
3805 if (align > GET_MODE_BITSIZE (desc->mode)
3807 && (in_section->common.flags & SECTION_MERGE))
3808 assemble_align (align);
3810 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3816 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3817 to as used. Emit referenced deferred strings. This function can
3818 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3821 mark_constant (rtx *current_rtx, void *data ATTRIBUTE_UNUSED)
3823 rtx x = *current_rtx;
3825 if (x == NULL_RTX || GET_CODE (x) != SYMBOL_REF)
3828 if (CONSTANT_POOL_ADDRESS_P (x))
3830 struct constant_descriptor_rtx *desc = SYMBOL_REF_CONSTANT (x);
3831 if (desc->mark == 0)
3834 for_each_rtx (&desc->constant, mark_constant, NULL);
3837 else if (TREE_CONSTANT_POOL_ADDRESS_P (x))
3839 tree exp = SYMBOL_REF_DECL (x);
3840 if (!TREE_ASM_WRITTEN (exp))
3842 n_deferred_constants--;
3843 output_constant_def_contents (x);
3850 /* Look through appropriate parts of INSN, marking all entries in the
3851 constant pool which are actually being used. Entries that are only
3852 referenced by other constants are also marked as used. Emit
3853 deferred strings that are used. */
3856 mark_constants (rtx insn)
3861 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3862 insns, not any notes that may be attached. We don't want to mark
3863 a constant just because it happens to appear in a REG_EQUIV note. */
3864 if (GET_CODE (PATTERN (insn)) == SEQUENCE)
3866 rtx seq = PATTERN (insn);
3867 int i, n = XVECLEN (seq, 0);
3868 for (i = 0; i < n; ++i)
3870 rtx subinsn = XVECEXP (seq, 0, i);
3871 if (INSN_P (subinsn))
3872 for_each_rtx (&PATTERN (subinsn), mark_constant, NULL);
3876 for_each_rtx (&PATTERN (insn), mark_constant, NULL);
3879 /* Look through the instructions for this function, and mark all the
3880 entries in POOL which are actually being used. Emit deferred constants
3881 which have indeed been used. */
3884 mark_constant_pool (void)
3888 if (!crtl->uses_const_pool && n_deferred_constants == 0)
3891 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
3892 mark_constants (insn);
3894 for (link = crtl->epilogue_delay_list;
3896 link = XEXP (link, 1))
3897 mark_constants (XEXP (link, 0));
3900 /* Write all the constants in POOL. */
3903 output_constant_pool_contents (struct rtx_constant_pool *pool)
3905 struct constant_descriptor_rtx *desc;
3907 for (desc = pool->first; desc ; desc = desc->next)
3910 /* If the constant is part of an object_block, make sure that
3911 the constant has been positioned within its block, but do not
3912 write out its definition yet. output_object_blocks will do
3914 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc->sym)
3915 && SYMBOL_REF_BLOCK (desc->sym))
3916 place_block_symbol (desc->sym);
3919 switch_to_section (targetm.asm_out.select_rtx_section
3920 (desc->mode, desc->constant, desc->align));
3921 output_constant_pool_1 (desc, desc->align);
3926 /* Mark all constants that are used in the current function, then write
3927 out the function's private constant pool. */
3930 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED,
3931 tree fndecl ATTRIBUTE_UNUSED)
3933 struct rtx_constant_pool *pool = crtl->varasm.pool;
3935 /* It is possible for gcc to call force_const_mem and then to later
3936 discard the instructions which refer to the constant. In such a
3937 case we do not need to output the constant. */
3938 mark_constant_pool ();
3940 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3941 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file, fnname, fndecl, pool->offset);
3944 output_constant_pool_contents (pool);
3946 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3947 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file, fnname, fndecl, pool->offset);
3951 /* Write the contents of the shared constant pool. */
3954 output_shared_constant_pool (void)
3956 output_constant_pool_contents (shared_constant_pool);
3959 /* Determine what kind of relocations EXP may need. */
3962 compute_reloc_for_constant (tree exp)
3964 int reloc = 0, reloc2;
3967 switch (TREE_CODE (exp))
3971 /* Go inside any operations that get_inner_reference can handle and see
3972 if what's inside is a constant: no need to do anything here for
3973 addresses of variables or functions. */
3974 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
3975 tem = TREE_OPERAND (tem, 0))
3978 if (TREE_PUBLIC (tem))
3985 case POINTER_PLUS_EXPR:
3986 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3987 reloc |= compute_reloc_for_constant (TREE_OPERAND (exp, 1));
3991 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3992 reloc2 = compute_reloc_for_constant (TREE_OPERAND (exp, 1));
3993 /* The difference of two local labels is computable at link time. */
3994 if (reloc == 1 && reloc2 == 1)
4001 case VIEW_CONVERT_EXPR:
4002 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
4007 unsigned HOST_WIDE_INT idx;
4008 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
4010 reloc |= compute_reloc_for_constant (tem);
4020 /* Find all the constants whose addresses are referenced inside of EXP,
4021 and make sure assembler code with a label has been output for each one.
4022 Indicate whether an ADDR_EXPR has been encountered. */
4025 output_addressed_constants (tree exp)
4029 switch (TREE_CODE (exp))
4033 /* Go inside any operations that get_inner_reference can handle and see
4034 if what's inside is a constant: no need to do anything here for
4035 addresses of variables or functions. */
4036 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
4037 tem = TREE_OPERAND (tem, 0))
4040 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4041 if (TREE_CODE (tem) == CONST_DECL && DECL_INITIAL (tem))
4042 tem = DECL_INITIAL (tem);
4044 if (CONSTANT_CLASS_P (tem) || TREE_CODE (tem) == CONSTRUCTOR)
4045 output_constant_def (tem, 0);
4049 case POINTER_PLUS_EXPR:
4051 output_addressed_constants (TREE_OPERAND (exp, 1));
4055 case VIEW_CONVERT_EXPR:
4056 output_addressed_constants (TREE_OPERAND (exp, 0));
4061 unsigned HOST_WIDE_INT idx;
4062 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
4064 output_addressed_constants (tem);
4073 /* Whether a constructor CTOR is a valid static constant initializer if all
4074 its elements are. This used to be internal to initializer_constant_valid_p
4075 and has been exposed to let other functions like categorize_ctor_elements
4076 evaluate the property while walking a constructor for other purposes. */
4079 constructor_static_from_elts_p (const_tree ctor)
4081 return (TREE_CONSTANT (ctor)
4082 && (TREE_CODE (TREE_TYPE (ctor)) == UNION_TYPE
4083 || TREE_CODE (TREE_TYPE (ctor)) == RECORD_TYPE)
4084 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (ctor)));
4087 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4088 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4089 which are valid when ENDTYPE is an integer of any size; in
4090 particular, this does not accept a pointer minus a constant. This
4091 returns null_pointer_node if the VALUE is an absolute constant
4092 which can be used to initialize a static variable. Otherwise it
4096 narrowing_initializer_constant_valid_p (tree value, tree endtype)
4100 if (!INTEGRAL_TYPE_P (endtype))
4103 op0 = TREE_OPERAND (value, 0);
4104 op1 = TREE_OPERAND (value, 1);
4106 /* Like STRIP_NOPS except allow the operand mode to widen. This
4107 works around a feature of fold that simplifies (int)(p1 - p2) to
4108 ((int)p1 - (int)p2) under the theory that the narrower operation
4111 while (CONVERT_EXPR_P (op0)
4112 || TREE_CODE (op0) == NON_LVALUE_EXPR)
4114 tree inner = TREE_OPERAND (op0, 0);
4115 if (inner == error_mark_node
4116 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
4117 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0)))
4118 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
4123 while (CONVERT_EXPR_P (op1)
4124 || TREE_CODE (op1) == NON_LVALUE_EXPR)
4126 tree inner = TREE_OPERAND (op1, 0);
4127 if (inner == error_mark_node
4128 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
4129 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1)))
4130 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
4135 op0 = initializer_constant_valid_p (op0, endtype);
4136 op1 = initializer_constant_valid_p (op1, endtype);
4138 /* Both initializers must be known. */
4142 && (op0 == null_pointer_node
4143 || TREE_CODE (value) == MINUS_EXPR))
4144 return null_pointer_node;
4146 /* Support differences between labels. */
4147 if (TREE_CODE (op0) == LABEL_DECL
4148 && TREE_CODE (op1) == LABEL_DECL)
4149 return null_pointer_node;
4151 if (TREE_CODE (op0) == STRING_CST
4152 && TREE_CODE (op1) == STRING_CST
4153 && operand_equal_p (op0, op1, 1))
4154 return null_pointer_node;
4160 /* Return nonzero if VALUE is a valid constant-valued expression
4161 for use in initializing a static variable; one that can be an
4162 element of a "constant" initializer.
4164 Return null_pointer_node if the value is absolute;
4165 if it is relocatable, return the variable that determines the relocation.
4166 We assume that VALUE has been folded as much as possible;
4167 therefore, we do not need to check for such things as
4168 arithmetic-combinations of integers. */
4171 initializer_constant_valid_p (tree value, tree endtype)
4175 switch (TREE_CODE (value))
4178 if (constructor_static_from_elts_p (value))
4180 unsigned HOST_WIDE_INT idx;
4182 bool absolute = true;
4184 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value), idx, elt)
4187 reloc = initializer_constant_valid_p (elt, TREE_TYPE (elt));
4190 if (reloc != null_pointer_node)
4193 /* For a non-absolute relocation, there is no single
4194 variable that can be "the variable that determines the
4196 return absolute ? null_pointer_node : error_mark_node;
4199 return TREE_STATIC (value) ? null_pointer_node : NULL_TREE;
4207 return null_pointer_node;
4212 tree op0 = staticp (TREE_OPERAND (value, 0));
4215 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4216 to be a constant, this is old-skool offsetof-like nonsense. */
4217 if (TREE_CODE (op0) == INDIRECT_REF
4218 && TREE_CONSTANT (TREE_OPERAND (op0, 0)))
4219 return null_pointer_node;
4220 /* Taking the address of a nested function involves a trampoline,
4221 unless we don't need or want one. */
4222 if (TREE_CODE (op0) == FUNCTION_DECL
4223 && decl_function_context (op0)
4224 && !DECL_NO_STATIC_CHAIN (op0)
4225 && !TREE_NO_TRAMPOLINE (value))
4227 /* "&{...}" requires a temporary to hold the constructed
4229 if (TREE_CODE (op0) == CONSTRUCTOR)
4235 case NON_LVALUE_EXPR:
4236 return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype);
4238 case VIEW_CONVERT_EXPR:
4240 tree src = TREE_OPERAND (value, 0);
4241 tree src_type = TREE_TYPE (src);
4242 tree dest_type = TREE_TYPE (value);
4244 /* Allow view-conversions from aggregate to non-aggregate type only
4245 if the bit pattern is fully preserved afterwards; otherwise, the
4246 RTL expander won't be able to apply a subsequent transformation
4247 to the underlying constructor. */
4248 if (AGGREGATE_TYPE_P (src_type) && !AGGREGATE_TYPE_P (dest_type))
4250 if (TYPE_MODE (endtype) == TYPE_MODE (dest_type))
4251 return initializer_constant_valid_p (src, endtype);
4256 /* Allow all other kinds of view-conversion. */
4257 return initializer_constant_valid_p (src, endtype);
4262 tree src = TREE_OPERAND (value, 0);
4263 tree src_type = TREE_TYPE (src);
4264 tree dest_type = TREE_TYPE (value);
4266 /* Allow conversions between pointer types, floating-point
4267 types, and offset types. */
4268 if ((POINTER_TYPE_P (dest_type) && POINTER_TYPE_P (src_type))
4269 || (FLOAT_TYPE_P (dest_type) && FLOAT_TYPE_P (src_type))
4270 || (TREE_CODE (dest_type) == OFFSET_TYPE
4271 && TREE_CODE (src_type) == OFFSET_TYPE))
4272 return initializer_constant_valid_p (src, endtype);
4274 /* Allow length-preserving conversions between integer types. */
4275 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type)
4276 && (TYPE_PRECISION (dest_type) == TYPE_PRECISION (src_type)))
4277 return initializer_constant_valid_p (src, endtype);
4279 /* Allow conversions between other integer types only if
4281 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type))
4283 tree inner = initializer_constant_valid_p (src, endtype);
4284 if (inner == null_pointer_node)
4285 return null_pointer_node;
4289 /* Allow (int) &foo provided int is as wide as a pointer. */
4290 if (INTEGRAL_TYPE_P (dest_type) && POINTER_TYPE_P (src_type)
4291 && (TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type)))
4292 return initializer_constant_valid_p (src, endtype);
4294 /* Likewise conversions from int to pointers, but also allow
4295 conversions from 0. */
4296 if ((POINTER_TYPE_P (dest_type)
4297 || TREE_CODE (dest_type) == OFFSET_TYPE)
4298 && INTEGRAL_TYPE_P (src_type))
4300 if (TREE_CODE (src) == INTEGER_CST
4301 && TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type))
4302 return null_pointer_node;
4303 if (integer_zerop (src))
4304 return null_pointer_node;
4305 else if (TYPE_PRECISION (dest_type) <= TYPE_PRECISION (src_type))
4306 return initializer_constant_valid_p (src, endtype);
4309 /* Allow conversions to struct or union types if the value
4311 if (TREE_CODE (dest_type) == RECORD_TYPE
4312 || TREE_CODE (dest_type) == UNION_TYPE)
4313 return initializer_constant_valid_p (src, endtype);
4317 case POINTER_PLUS_EXPR:
4319 if (! INTEGRAL_TYPE_P (endtype)
4320 || TYPE_PRECISION (endtype) >= POINTER_SIZE)
4322 tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
4324 tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
4326 /* If either term is absolute, use the other term's relocation. */
4327 if (valid0 == null_pointer_node)
4329 if (valid1 == null_pointer_node)
4333 /* Support narrowing pointer differences. */
4334 ret = narrowing_initializer_constant_valid_p (value, endtype);
4335 if (ret != NULL_TREE)
4341 if (! INTEGRAL_TYPE_P (endtype)
4342 || TYPE_PRECISION (endtype) >= POINTER_SIZE)
4344 tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
4346 tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
4348 /* Win if second argument is absolute. */
4349 if (valid1 == null_pointer_node)
4351 /* Win if both arguments have the same relocation.
4352 Then the value is absolute. */
4353 if (valid0 == valid1 && valid0 != 0)
4354 return null_pointer_node;
4356 /* Since GCC guarantees that string constants are unique in the
4357 generated code, a subtraction between two copies of the same
4358 constant string is absolute. */
4359 if (valid0 && TREE_CODE (valid0) == STRING_CST
4360 && valid1 && TREE_CODE (valid1) == STRING_CST
4361 && operand_equal_p (valid0, valid1, 1))
4362 return null_pointer_node;
4365 /* Support narrowing differences. */
4366 ret = narrowing_initializer_constant_valid_p (value, endtype);
4367 if (ret != NULL_TREE)
4379 /* Return true if VALUE is a valid constant-valued expression
4380 for use in initializing a static bit-field; one that can be
4381 an element of a "constant" initializer. */
4384 initializer_constant_valid_for_bitfield_p (tree value)
4386 /* For bitfields we support integer constants or possibly nested aggregates
4388 switch (TREE_CODE (value))
4392 unsigned HOST_WIDE_INT idx;
4395 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value), idx, elt)
4396 if (!initializer_constant_valid_for_bitfield_p (elt))
4404 case VIEW_CONVERT_EXPR:
4405 case NON_LVALUE_EXPR:
4407 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value, 0));
4416 /* output_constructor outer state of relevance in recursive calls, typically
4417 for nested aggregate bitfields. */
4420 unsigned int bit_offset; /* current position in ... */
4421 int byte; /* ... the outer byte buffer. */
4424 static unsigned HOST_WIDE_INT
4425 output_constructor (tree, unsigned HOST_WIDE_INT, unsigned int,
4428 /* Output assembler code for constant EXP to FILE, with no label.
4429 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4430 Assumes output_addressed_constants has been done on EXP already.
4432 Generate exactly SIZE bytes of assembler data, padding at the end
4433 with zeros if necessary. SIZE must always be specified.
4435 SIZE is important for structure constructors,
4436 since trailing members may have been omitted from the constructor.
4437 It is also important for initialization of arrays from string constants
4438 since the full length of the string constant might not be wanted.
4439 It is also needed for initialization of unions, where the initializer's
4440 type is just one member, and that may not be as long as the union.
4442 There a case in which we would fail to output exactly SIZE bytes:
4443 for a structure constructor that wants to produce more than SIZE bytes.
4444 But such constructors will never be generated for any possible input.
4446 ALIGN is the alignment of the data in bits. */
4449 output_constant (tree exp, unsigned HOST_WIDE_INT size, unsigned int align)
4451 enum tree_code code;
4452 unsigned HOST_WIDE_INT thissize;
4454 if (size == 0 || flag_syntax_only)
4457 /* See if we're trying to initialize a pointer in a non-default mode
4458 to the address of some declaration somewhere. If the target says
4459 the mode is valid for pointers, assume the target has a way of
4461 if (TREE_CODE (exp) == NOP_EXPR
4462 && POINTER_TYPE_P (TREE_TYPE (exp))
4463 && targetm.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp))))
4465 tree saved_type = TREE_TYPE (exp);
4467 /* Peel off any intermediate conversions-to-pointer for valid
4469 while (TREE_CODE (exp) == NOP_EXPR
4470 && POINTER_TYPE_P (TREE_TYPE (exp))
4471 && targetm.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp))))
4472 exp = TREE_OPERAND (exp, 0);
4474 /* If what we're left with is the address of something, we can
4475 convert the address to the final type and output it that
4477 if (TREE_CODE (exp) == ADDR_EXPR)
4478 exp = build1 (ADDR_EXPR, saved_type, TREE_OPERAND (exp, 0));
4479 /* Likewise for constant ints. */
4480 else if (TREE_CODE (exp) == INTEGER_CST)
4481 exp = build_int_cst_wide (saved_type, TREE_INT_CST_LOW (exp),
4482 TREE_INT_CST_HIGH (exp));
4486 /* Eliminate any conversions since we'll be outputting the underlying
4488 while (CONVERT_EXPR_P (exp)
4489 || TREE_CODE (exp) == NON_LVALUE_EXPR
4490 || TREE_CODE (exp) == VIEW_CONVERT_EXPR)
4492 HOST_WIDE_INT type_size = int_size_in_bytes (TREE_TYPE (exp));
4493 HOST_WIDE_INT op_size = int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp, 0)));
4495 /* Make sure eliminating the conversion is really a no-op, except with
4496 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4497 union types to allow for Ada unchecked unions. */
4498 if (type_size > op_size
4499 && TREE_CODE (exp) != VIEW_CONVERT_EXPR
4500 && TREE_CODE (TREE_TYPE (exp)) != UNION_TYPE)
4501 /* Keep the conversion. */
4504 exp = TREE_OPERAND (exp, 0);
4507 code = TREE_CODE (TREE_TYPE (exp));
4508 thissize = int_size_in_bytes (TREE_TYPE (exp));
4510 /* Allow a constructor with no elements for any data type.
4511 This means to fill the space with zeros. */
4512 if (TREE_CODE (exp) == CONSTRUCTOR
4513 && VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (exp)))
4515 assemble_zeros (size);
4519 if (TREE_CODE (exp) == FDESC_EXPR)
4521 #ifdef ASM_OUTPUT_FDESC
4522 HOST_WIDE_INT part = tree_low_cst (TREE_OPERAND (exp, 1), 0);
4523 tree decl = TREE_OPERAND (exp, 0);
4524 ASM_OUTPUT_FDESC (asm_out_file, decl, part);
4531 /* Now output the underlying data. If we've handling the padding, return.
4532 Otherwise, break and ensure SIZE is the size written. */
4539 case REFERENCE_TYPE:
4541 case FIXED_POINT_TYPE:
4542 if (! assemble_integer (expand_expr (exp, NULL_RTX, VOIDmode,
4543 EXPAND_INITIALIZER),
4544 MIN (size, thissize), align, 0))
4545 error ("initializer for integer/fixed-point value is too complicated");
4549 if (TREE_CODE (exp) != REAL_CST)
4550 error ("initializer for floating value is not a floating constant");
4552 assemble_real (TREE_REAL_CST (exp), TYPE_MODE (TREE_TYPE (exp)), align);
4556 output_constant (TREE_REALPART (exp), thissize / 2, align);
4557 output_constant (TREE_IMAGPART (exp), thissize / 2,
4558 min_align (align, BITS_PER_UNIT * (thissize / 2)));
4563 switch (TREE_CODE (exp))
4566 output_constructor (exp, size, align, NULL);
4569 thissize = MIN ((unsigned HOST_WIDE_INT)TREE_STRING_LENGTH (exp),
4571 assemble_string (TREE_STRING_POINTER (exp), thissize);
4578 unsigned int nalign;
4579 enum machine_mode inner;
4581 inner = TYPE_MODE (TREE_TYPE (TREE_TYPE (exp)));
4582 nalign = MIN (align, GET_MODE_ALIGNMENT (inner));
4584 elt_size = GET_MODE_SIZE (inner);
4586 link = TREE_VECTOR_CST_ELTS (exp);
4587 output_constant (TREE_VALUE (link), elt_size, align);
4588 thissize = elt_size;
4589 while ((link = TREE_CHAIN (link)) != NULL)
4591 output_constant (TREE_VALUE (link), elt_size, nalign);
4592 thissize += elt_size;
4603 gcc_assert (TREE_CODE (exp) == CONSTRUCTOR);
4604 output_constructor (exp, size, align, NULL);
4614 if (size > thissize)
4615 assemble_zeros (size - thissize);
4619 /* Subroutine of output_constructor, used for computing the size of
4620 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4621 type with an unspecified upper bound. */
4623 static unsigned HOST_WIDE_INT
4624 array_size_for_constructor (tree val)
4627 unsigned HOST_WIDE_INT cnt;
4628 tree index, value, tmp;
4630 /* This code used to attempt to handle string constants that are not
4631 arrays of single-bytes, but nothing else does, so there's no point in
4633 if (TREE_CODE (val) == STRING_CST)
4634 return TREE_STRING_LENGTH (val);
4636 max_index = NULL_TREE;
4637 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val), cnt, index, value)
4639 if (TREE_CODE (index) == RANGE_EXPR)
4640 index = TREE_OPERAND (index, 1);
4641 if (max_index == NULL_TREE || tree_int_cst_lt (max_index, index))
4645 if (max_index == NULL_TREE)
4648 /* Compute the total number of array elements. */
4649 tmp = TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val)));
4650 i = size_binop (MINUS_EXPR, fold_convert (sizetype, max_index),
4651 fold_convert (sizetype, tmp));
4652 i = size_binop (PLUS_EXPR, i, build_int_cst (sizetype, 1));
4654 /* Multiply by the array element unit size to find number of bytes. */
4655 i = size_binop (MULT_EXPR, i, TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val))));
4657 return tree_low_cst (i, 1);
4660 /* Other datastructures + helpers for output_constructor. */
4662 /* output_constructor local state to support interaction with helpers. */
4666 /* Received arguments. */
4667 tree exp; /* Constructor expression. */
4668 unsigned HOST_WIDE_INT size; /* # bytes to output - pad if necessary. */
4669 unsigned int align; /* Known initial alignment. */
4671 /* Constructor expression data. */
4672 tree type; /* Expression type. */
4673 tree field; /* Current field decl in a record. */
4674 tree min_index; /* Lower bound if specified for an array. */
4676 /* Output processing state. */
4677 HOST_WIDE_INT total_bytes; /* # bytes output so far / current position. */
4678 bool byte_buffer_in_use; /* Whether byte ... */
4679 int byte; /* ... contains part of a bitfield byte yet to
4682 int last_relative_index; /* Implicit or explicit index of the last
4683 array element output within a bitfield. */
4684 /* Current element. */
4685 tree val; /* Current element value. */
4686 tree index; /* Current element index. */
4690 /* Helper for output_constructor. From the current LOCAL state, output a
4691 RANGE_EXPR element. */
4694 output_constructor_array_range (oc_local_state *local)
4696 unsigned HOST_WIDE_INT fieldsize
4697 = int_size_in_bytes (TREE_TYPE (local->type));
4699 HOST_WIDE_INT lo_index
4700 = tree_low_cst (TREE_OPERAND (local->index, 0), 0);
4701 HOST_WIDE_INT hi_index
4702 = tree_low_cst (TREE_OPERAND (local->index, 1), 0);
4703 HOST_WIDE_INT index;
4706 = min_align (local->align, fieldsize * BITS_PER_UNIT);
4708 for (index = lo_index; index <= hi_index; index++)
4710 /* Output the element's initial value. */
4711 if (local->val == NULL_TREE)
4712 assemble_zeros (fieldsize);
4714 output_constant (local->val, fieldsize, align2);
4716 /* Count its size. */
4717 local->total_bytes += fieldsize;
4721 /* Helper for output_constructor. From the current LOCAL state, output a
4722 field element that is not true bitfield or part of an outer one. */
4725 output_constructor_regular_field (oc_local_state *local)
4727 /* Field size and position. Since this structure is static, we know the
4728 positions are constant. */
4729 unsigned HOST_WIDE_INT fieldsize;
4730 HOST_WIDE_INT fieldpos;
4732 unsigned int align2;
4734 if (local->index != NULL_TREE)
4735 fieldpos = (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (local->val)), 1)
4736 * ((tree_low_cst (local->index, 0)
4737 - tree_low_cst (local->min_index, 0))));
4738 else if (local->field != NULL_TREE)
4739 fieldpos = int_byte_position (local->field);
4743 /* Output any buffered-up bit-fields preceding this element. */
4744 if (local->byte_buffer_in_use)
4746 assemble_integer (GEN_INT (local->byte), 1, BITS_PER_UNIT, 1);
4747 local->total_bytes++;
4748 local->byte_buffer_in_use = false;
4751 /* Advance to offset of this element.
4752 Note no alignment needed in an array, since that is guaranteed
4753 if each element has the proper size. */
4754 if ((local->field != NULL_TREE || local->index != NULL_TREE)
4755 && fieldpos != local->total_bytes)
4757 gcc_assert (fieldpos >= local->total_bytes);
4758 assemble_zeros (fieldpos - local->total_bytes);
4759 local->total_bytes = fieldpos;
4762 /* Find the alignment of this element. */
4763 align2 = min_align (local->align, BITS_PER_UNIT * fieldpos);
4765 /* Determine size this element should occupy. */
4770 /* If this is an array with an unspecified upper bound,
4771 the initializer determines the size. */
4772 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4773 but we cannot do this until the deprecated support for
4774 initializing zero-length array members is removed. */
4775 if (TREE_CODE (TREE_TYPE (local->field)) == ARRAY_TYPE
4776 && TYPE_DOMAIN (TREE_TYPE (local->field))
4777 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local->field))))
4779 fieldsize = array_size_for_constructor (local->val);
4780 /* Given a non-empty initialization, this field had
4782 gcc_assert (!fieldsize || !TREE_CHAIN (local->field));
4784 else if (DECL_SIZE_UNIT (local->field))
4786 /* ??? This can't be right. If the decl size overflows
4787 a host integer we will silently emit no data. */
4788 if (host_integerp (DECL_SIZE_UNIT (local->field), 1))
4789 fieldsize = tree_low_cst (DECL_SIZE_UNIT (local->field), 1);
4793 fieldsize = int_size_in_bytes (TREE_TYPE (local->type));
4795 /* Output the element's initial value. */
4796 if (local->val == NULL_TREE)
4797 assemble_zeros (fieldsize);
4799 output_constant (local->val, fieldsize, align2);
4801 /* Count its size. */
4802 local->total_bytes += fieldsize;
4805 /* Helper for output_constructor. From the current LOCAL and OUTER states,
4806 output an element that is a true bitfield or part of an outer one. */
4809 output_constructor_bitfield (oc_local_state *local, oc_outer_state *outer)
4811 /* Bit size of this element. */
4812 HOST_WIDE_INT ebitsize
4814 ? tree_low_cst (DECL_SIZE (local->field), 1)
4815 : tree_low_cst (TYPE_SIZE (TREE_TYPE (local->type)), 1));
4817 /* Relative index of this element if this is an array component. */
4818 HOST_WIDE_INT relative_index
4821 ? (tree_low_cst (local->index, 0)
4822 - tree_low_cst (local->min_index, 0))
4823 : local->last_relative_index + 1)
4826 /* Bit position of this element from the start of the containing
4828 HOST_WIDE_INT constructor_relative_ebitpos
4830 ? int_bit_position (local->field)
4831 : ebitsize * relative_index);
4833 /* Bit position of this element from the start of a possibly ongoing
4834 outer byte buffer. */
4835 HOST_WIDE_INT byte_relative_ebitpos
4836 = ((outer ? outer->bit_offset : 0) + constructor_relative_ebitpos);
4838 /* From the start of a possibly ongoing outer byte buffer, offsets to
4839 the first bit of this element and to the first bit past the end of
4841 HOST_WIDE_INT next_offset = byte_relative_ebitpos;
4842 HOST_WIDE_INT end_offset = byte_relative_ebitpos + ebitsize;
4844 local->last_relative_index = relative_index;
4846 if (local->val == NULL_TREE)
4847 local->val = integer_zero_node;
4849 while (TREE_CODE (local->val) == VIEW_CONVERT_EXPR
4850 || TREE_CODE (local->val) == NON_LVALUE_EXPR)
4851 local->val = TREE_OPERAND (local->val, 0);
4853 if (TREE_CODE (local->val) != INTEGER_CST
4854 && TREE_CODE (local->val) != CONSTRUCTOR)
4856 error ("invalid initial value for member %qE", DECL_NAME (local->field));
4860 /* If this field does not start in this (or, next) byte,
4862 if (next_offset / BITS_PER_UNIT != local->total_bytes)
4864 /* Output remnant of any bit field in previous bytes. */
4865 if (local->byte_buffer_in_use)
4867 assemble_integer (GEN_INT (local->byte), 1, BITS_PER_UNIT, 1);
4868 local->total_bytes++;
4869 local->byte_buffer_in_use = false;
4872 /* If still not at proper byte, advance to there. */
4873 if (next_offset / BITS_PER_UNIT != local->total_bytes)
4875 gcc_assert (next_offset / BITS_PER_UNIT >= local->total_bytes);
4876 assemble_zeros (next_offset / BITS_PER_UNIT - local->total_bytes);
4877 local->total_bytes = next_offset / BITS_PER_UNIT;
4881 /* Set up the buffer if necessary. */
4882 if (!local->byte_buffer_in_use)
4886 local->byte_buffer_in_use = true;
4889 /* If this is nested constructor, recurse passing the bit offset and the
4890 pending data, then retrieve the new pending data afterwards. */
4891 if (TREE_CODE (local->val) == CONSTRUCTOR)
4893 oc_outer_state output_state;
4895 output_state.bit_offset = next_offset % BITS_PER_UNIT;
4896 output_state.byte = local->byte;
4898 += output_constructor (local->val, 0, 0, &output_state);
4899 local->byte = output_state.byte;
4903 /* Otherwise, we must split the element into pieces that fall within
4904 separate bytes, and combine each byte with previous or following
4906 while (next_offset < end_offset)
4910 HOST_WIDE_INT value;
4911 HOST_WIDE_INT next_byte = next_offset / BITS_PER_UNIT;
4912 HOST_WIDE_INT next_bit = next_offset % BITS_PER_UNIT;
4914 /* Advance from byte to byte
4915 within this element when necessary. */
4916 while (next_byte != local->total_bytes)
4918 assemble_integer (GEN_INT (local->byte), 1, BITS_PER_UNIT, 1);
4919 local->total_bytes++;
4923 /* Number of bits we can process at once
4924 (all part of the same byte). */
4925 this_time = MIN (end_offset - next_offset,
4926 BITS_PER_UNIT - next_bit);
4927 if (BYTES_BIG_ENDIAN)
4929 /* On big-endian machine, take the most significant bits
4930 first (of the bits that are significant)
4931 and put them into bytes from the most significant end. */
4932 shift = end_offset - next_offset - this_time;
4934 /* Don't try to take a bunch of bits that cross
4935 the word boundary in the INTEGER_CST. We can
4936 only select bits from the LOW or HIGH part
4938 if (shift < HOST_BITS_PER_WIDE_INT
4939 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4941 this_time = shift + this_time - HOST_BITS_PER_WIDE_INT;
4942 shift = HOST_BITS_PER_WIDE_INT;
4945 /* Now get the bits from the appropriate constant word. */
4946 if (shift < HOST_BITS_PER_WIDE_INT)
4947 value = TREE_INT_CST_LOW (local->val);
4950 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
4951 value = TREE_INT_CST_HIGH (local->val);
4952 shift -= HOST_BITS_PER_WIDE_INT;
4955 /* Get the result. This works only when:
4956 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4957 local->byte |= (((value >> shift)
4958 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
4959 << (BITS_PER_UNIT - this_time - next_bit));
4963 /* On little-endian machines,
4964 take first the least significant bits of the value
4965 and pack them starting at the least significant
4966 bits of the bytes. */
4967 shift = next_offset - byte_relative_ebitpos;
4969 /* Don't try to take a bunch of bits that cross
4970 the word boundary in the INTEGER_CST. We can
4971 only select bits from the LOW or HIGH part
4973 if (shift < HOST_BITS_PER_WIDE_INT
4974 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4975 this_time = (HOST_BITS_PER_WIDE_INT - shift);
4977 /* Now get the bits from the appropriate constant word. */
4978 if (shift < HOST_BITS_PER_WIDE_INT)
4979 value = TREE_INT_CST_LOW (local->val);
4982 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
4983 value = TREE_INT_CST_HIGH (local->val);
4984 shift -= HOST_BITS_PER_WIDE_INT;
4987 /* Get the result. This works only when:
4988 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4989 local->byte |= (((value >> shift)
4990 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
4994 next_offset += this_time;
4995 local->byte_buffer_in_use = true;
4999 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5000 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5001 caller output state of relevance in recursive invocations. */
5003 static unsigned HOST_WIDE_INT
5004 output_constructor (tree exp, unsigned HOST_WIDE_INT size,
5005 unsigned int align, oc_outer_state * outer)
5007 unsigned HOST_WIDE_INT cnt;
5008 constructor_elt *ce;
5010 oc_local_state local;
5012 /* Setup our local state to communicate with helpers. */
5015 local.align = align;
5017 local.total_bytes = 0;
5018 local.byte_buffer_in_use = outer != NULL;
5019 local.byte = outer ? outer->byte : 0;
5021 local.type = TREE_TYPE (exp);
5023 local.last_relative_index = -1;
5025 local.min_index = NULL_TREE;
5026 if (TREE_CODE (local.type) == ARRAY_TYPE
5027 && TYPE_DOMAIN (local.type) != NULL_TREE)
5028 local.min_index = TYPE_MIN_VALUE (TYPE_DOMAIN (local.type));
5030 gcc_assert (HOST_BITS_PER_WIDE_INT >= BITS_PER_UNIT);
5032 /* As CE goes through the elements of the constant, FIELD goes through the
5033 structure fields if the constant is a structure. If the constant is a
5034 union, we override this by getting the field from the TREE_LIST element.
5035 But the constant could also be an array. Then FIELD is zero.
5037 There is always a maximum of one element in the chain LINK for unions
5038 (even if the initializer in a source program incorrectly contains
5041 local.field = NULL_TREE;
5042 if (TREE_CODE (local.type) == RECORD_TYPE)
5043 local.field = TYPE_FIELDS (local.type);
5046 VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (exp), cnt, ce);
5047 cnt++, local.field = local.field ? TREE_CHAIN (local.field) : 0)
5049 local.val = ce->value;
5050 local.index = NULL_TREE;
5052 /* The element in a union constructor specifies the proper field
5054 if ((TREE_CODE (local.type) == RECORD_TYPE
5055 || TREE_CODE (local.type) == UNION_TYPE
5056 || TREE_CODE (local.type) == QUAL_UNION_TYPE)
5057 && ce->index != NULL_TREE)
5058 local.field = ce->index;
5060 else if (TREE_CODE (local.type) == ARRAY_TYPE)
5061 local.index = ce->index;
5063 #ifdef ASM_COMMENT_START
5064 if (local.field && flag_verbose_asm)
5065 fprintf (asm_out_file, "%s %s:\n",
5067 DECL_NAME (local.field)
5068 ? IDENTIFIER_POINTER (DECL_NAME (local.field))
5072 /* Eliminate the marker that makes a cast not be an lvalue. */
5073 if (local.val != NULL_TREE)
5074 STRIP_NOPS (local.val);
5076 /* Output the current element, using the appropriate helper ... */
5078 /* For an array slice not part of an outer bitfield. */
5080 && local.index != NULL_TREE
5081 && TREE_CODE (local.index) == RANGE_EXPR)
5082 output_constructor_array_range (&local);
5084 /* For a field that is neither a true bitfield nor part of an outer one,
5085 known to be at least byte aligned and multiple-of-bytes long. */
5087 && (local.field == NULL_TREE
5088 || !CONSTRUCTOR_BITFIELD_P (local.field)))
5089 output_constructor_regular_field (&local);
5091 /* For a true bitfield or part of an outer one. */
5093 output_constructor_bitfield (&local, outer);
5096 /* If we are not at toplevel, save the pending data for our caller.
5097 Otherwise output the pending data and padding zeros as needed. */
5099 outer->byte = local.byte;
5102 if (local.byte_buffer_in_use)
5104 assemble_integer (GEN_INT (local.byte), 1, BITS_PER_UNIT, 1);
5105 local.total_bytes++;
5108 if ((unsigned HOST_WIDE_INT)local.total_bytes < local.size)
5110 assemble_zeros (local.size - local.total_bytes);
5111 local.total_bytes = local.size;
5115 return local.total_bytes;
5118 /* Mark DECL as weak. */
5121 mark_weak (tree decl)
5123 DECL_WEAK (decl) = 1;
5125 if (DECL_RTL_SET_P (decl)
5126 && MEM_P (DECL_RTL (decl))
5127 && XEXP (DECL_RTL (decl), 0)
5128 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == SYMBOL_REF)
5129 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl), 0)) = 1;
5132 /* Merge weak status between NEWDECL and OLDDECL. */
5135 merge_weak (tree newdecl, tree olddecl)
5137 if (DECL_WEAK (newdecl) == DECL_WEAK (olddecl))
5139 if (DECL_WEAK (newdecl) && SUPPORTS_WEAK)
5142 /* We put the NEWDECL on the weak_decls list at some point
5143 and OLDDECL as well. Keep just OLDDECL on the list. */
5144 for (pwd = &weak_decls; *pwd; pwd = &TREE_CHAIN (*pwd))
5145 if (TREE_VALUE (*pwd) == newdecl)
5147 *pwd = TREE_CHAIN (*pwd);
5154 if (DECL_WEAK (newdecl))
5158 /* NEWDECL is weak, but OLDDECL is not. */
5160 /* If we already output the OLDDECL, we're in trouble; we can't
5161 go back and make it weak. This error cannot be caught in
5162 declare_weak because the NEWDECL and OLDDECL was not yet
5163 been merged; therefore, TREE_ASM_WRITTEN was not set. */
5164 if (TREE_ASM_WRITTEN (olddecl))
5165 error ("weak declaration of %q+D must precede definition",
5168 /* If we've already generated rtl referencing OLDDECL, we may
5169 have done so in a way that will not function properly with
5171 else if (TREE_USED (olddecl)
5172 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl)))
5173 warning (0, "weak declaration of %q+D after first use results "
5174 "in unspecified behavior", newdecl);
5178 /* We put the NEWDECL on the weak_decls list at some point.
5179 Replace it with the OLDDECL. */
5180 for (wd = weak_decls; wd; wd = TREE_CHAIN (wd))
5181 if (TREE_VALUE (wd) == newdecl)
5183 TREE_VALUE (wd) = olddecl;
5186 /* We may not find the entry on the list. If NEWDECL is a
5187 weak alias, then we will have already called
5188 globalize_decl to remove the entry; in that case, we do
5189 not need to do anything. */
5192 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5193 mark_weak (olddecl);
5196 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5197 weak. Just update NEWDECL to indicate that it's weak too. */
5198 mark_weak (newdecl);
5201 /* Declare DECL to be a weak symbol. */
5204 declare_weak (tree decl)
5206 if (! TREE_PUBLIC (decl))
5207 error ("weak declaration of %q+D must be public", decl);
5208 else if (TREE_CODE (decl) == FUNCTION_DECL && TREE_ASM_WRITTEN (decl))
5209 error ("weak declaration of %q+D must precede definition", decl);
5210 else if (!SUPPORTS_WEAK)
5211 warning (0, "weak declaration of %q+D not supported", decl);
5217 weak_finish_1 (tree decl)
5219 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5220 const char *const name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5223 if (! TREE_USED (decl))
5226 #ifdef ASM_WEAKEN_DECL
5227 ASM_WEAKEN_DECL (asm_out_file, decl, name, NULL);
5229 #ifdef ASM_WEAKEN_LABEL
5230 ASM_WEAKEN_LABEL (asm_out_file, name);
5232 #ifdef ASM_OUTPUT_WEAK_ALIAS
5234 static bool warn_once = 0;
5237 warning (0, "only weak aliases are supported in this configuration");
5247 /* This TREE_LIST contains weakref targets. */
5249 static GTY(()) tree weakref_targets;
5251 /* Forward declaration. */
5252 static tree find_decl_and_mark_needed (tree decl, tree target);
5254 /* Emit any pending weak declarations. */
5261 for (t = weakref_targets; t; t = TREE_CHAIN (t))
5263 tree alias_decl = TREE_PURPOSE (t);
5264 tree target = ultimate_transparent_alias_target (&TREE_VALUE (t));
5266 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl)))
5267 /* Remove alias_decl from the weak list, but leave entries for
5268 the target alone. */
5270 #ifndef ASM_OUTPUT_WEAKREF
5271 else if (! TREE_SYMBOL_REFERENCED (target))
5273 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5274 defined, otherwise we and weak_finish_1 would use
5275 different macros. */
5276 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5277 ASM_WEAKEN_LABEL (asm_out_file, IDENTIFIER_POINTER (target));
5279 tree decl = find_decl_and_mark_needed (alias_decl, target);
5283 decl = build_decl (DECL_SOURCE_LOCATION (alias_decl),
5284 TREE_CODE (alias_decl), target,
5285 TREE_TYPE (alias_decl));
5287 DECL_EXTERNAL (decl) = 1;
5288 TREE_PUBLIC (decl) = 1;
5289 DECL_ARTIFICIAL (decl) = 1;
5290 TREE_NOTHROW (decl) = TREE_NOTHROW (alias_decl);
5291 TREE_USED (decl) = 1;
5294 weak_finish_1 (decl);
5303 /* Remove the alias and the target from the pending weak list
5304 so that we do not emit any .weak directives for the former,
5305 nor multiple .weak directives for the latter. */
5306 for (p = &weak_decls; (t2 = *p) ; )
5308 if (TREE_VALUE (t2) == alias_decl
5309 || target == DECL_ASSEMBLER_NAME (TREE_VALUE (t2)))
5310 *p = TREE_CHAIN (t2);
5312 p = &TREE_CHAIN (t2);
5315 /* Remove other weakrefs to the same target, to speed things up. */
5316 for (p = &TREE_CHAIN (t); (t2 = *p) ; )
5318 if (target == ultimate_transparent_alias_target (&TREE_VALUE (t2)))
5319 *p = TREE_CHAIN (t2);
5321 p = &TREE_CHAIN (t2);
5326 for (t = weak_decls; t; t = TREE_CHAIN (t))
5328 tree decl = TREE_VALUE (t);
5330 weak_finish_1 (decl);
5334 /* Emit the assembly bits to indicate that DECL is globally visible. */
5337 globalize_decl (tree decl)
5340 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5341 if (DECL_WEAK (decl))
5343 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
5346 #ifdef ASM_WEAKEN_DECL
5347 ASM_WEAKEN_DECL (asm_out_file, decl, name, 0);
5349 ASM_WEAKEN_LABEL (asm_out_file, name);
5352 /* Remove this function from the pending weak list so that
5353 we do not emit multiple .weak directives for it. */
5354 for (p = &weak_decls; (t = *p) ; )
5356 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
5357 *p = TREE_CHAIN (t);
5359 p = &TREE_CHAIN (t);
5362 /* Remove weakrefs to the same target from the pending weakref
5363 list, for the same reason. */
5364 for (p = &weakref_targets; (t = *p) ; )
5366 if (DECL_ASSEMBLER_NAME (decl)
5367 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
5368 *p = TREE_CHAIN (t);
5370 p = &TREE_CHAIN (t);
5377 targetm.asm_out.globalize_decl_name (asm_out_file, decl);
5380 /* We have to be able to tell cgraph about the needed-ness of the target
5381 of an alias. This requires that the decl have been defined. Aliases
5382 that precede their definition have to be queued for later processing. */
5384 typedef struct GTY(()) alias_pair {
5389 /* Define gc'd vector type. */
5390 DEF_VEC_O(alias_pair);
5391 DEF_VEC_ALLOC_O(alias_pair,gc);
5393 static GTY(()) VEC(alias_pair,gc) *alias_pairs;
5395 /* Given an assembly name, find the decl it is associated with. At the
5396 same time, mark it needed for cgraph. */
5399 find_decl_and_mark_needed (tree decl, tree target)
5401 struct cgraph_node *fnode = NULL;
5402 struct varpool_node *vnode = NULL;
5404 if (TREE_CODE (decl) == FUNCTION_DECL)
5406 fnode = cgraph_node_for_asm (target);
5408 vnode = varpool_node_for_asm (target);
5412 vnode = varpool_node_for_asm (target);
5414 fnode = cgraph_node_for_asm (target);
5419 /* We can't mark function nodes as used after cgraph global info
5420 is finished. This wouldn't generally be necessary, but C++
5421 virtual table thunks are introduced late in the game and
5422 might seem like they need marking, although in fact they
5424 if (! cgraph_global_info_ready)
5425 cgraph_mark_needed_node (fnode);
5430 varpool_mark_needed_node (vnode);
5437 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5438 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5439 tree node is DECL to have the value of the tree node TARGET. */
5442 do_assemble_alias (tree decl, tree target)
5444 if (TREE_ASM_WRITTEN (decl))
5447 TREE_ASM_WRITTEN (decl) = 1;
5448 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl)) = 1;
5450 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
5452 ultimate_transparent_alias_target (&target);
5454 if (!targetm.have_tls
5455 && TREE_CODE (decl) == VAR_DECL
5456 && DECL_THREAD_LOCAL_P (decl))
5458 decl = emutls_decl (decl);
5459 target = get_emutls_object_name (target);
5462 if (!TREE_SYMBOL_REFERENCED (target))
5463 weakref_targets = tree_cons (decl, target, weakref_targets);
5465 #ifdef ASM_OUTPUT_WEAKREF
5466 ASM_OUTPUT_WEAKREF (asm_out_file, decl,
5467 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
5468 IDENTIFIER_POINTER (target));
5472 error_at (DECL_SOURCE_LOCATION (decl),
5473 "weakref is not supported in this configuration");
5480 if (!targetm.have_tls
5481 && TREE_CODE (decl) == VAR_DECL
5482 && DECL_THREAD_LOCAL_P (decl))
5484 decl = emutls_decl (decl);
5485 target = get_emutls_object_name (target);
5488 #ifdef ASM_OUTPUT_DEF
5489 /* Make name accessible from other files, if appropriate. */
5491 if (TREE_PUBLIC (decl))
5493 globalize_decl (decl);
5494 maybe_assemble_visibility (decl);
5497 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5498 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file, decl, target);
5500 ASM_OUTPUT_DEF (asm_out_file,
5501 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
5502 IDENTIFIER_POINTER (target));
5504 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5509 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5510 # ifdef ASM_WEAKEN_DECL
5511 ASM_WEAKEN_DECL (asm_out_file, decl, name, IDENTIFIER_POINTER (target));
5513 ASM_OUTPUT_WEAK_ALIAS (asm_out_file, name, IDENTIFIER_POINTER (target));
5515 /* Remove this function from the pending weak list so that
5516 we do not emit multiple .weak directives for it. */
5517 for (p = &weak_decls; (t = *p) ; )
5518 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
5519 *p = TREE_CHAIN (t);
5521 p = &TREE_CHAIN (t);
5523 /* Remove weakrefs to the same target from the pending weakref
5524 list, for the same reason. */
5525 for (p = &weakref_targets; (t = *p) ; )
5527 if (DECL_ASSEMBLER_NAME (decl)
5528 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
5529 *p = TREE_CHAIN (t);
5531 p = &TREE_CHAIN (t);
5537 /* First pass of completing pending aliases. Make sure that cgraph knows
5538 which symbols will be required. */
5541 finish_aliases_1 (void)
5546 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); i++)
5550 target_decl = find_decl_and_mark_needed (p->decl, p->target);
5551 if (target_decl == NULL)
5553 if (! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
5554 error ("%q+D aliased to undefined symbol %qE",
5555 p->decl, p->target);
5557 else if (DECL_EXTERNAL (target_decl)
5558 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
5559 error ("%q+D aliased to external symbol %qE",
5560 p->decl, p->target);
5564 /* Second pass of completing pending aliases. Emit the actual assembly.
5565 This happens at the end of compilation and thus it is assured that the
5566 target symbol has been emitted. */
5569 finish_aliases_2 (void)
5574 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); i++)
5575 do_assemble_alias (p->decl, p->target);
5577 VEC_truncate (alias_pair, alias_pairs, 0);
5580 /* Emit an assembler directive to make the symbol for DECL an alias to
5581 the symbol for TARGET. */
5584 assemble_alias (tree decl, tree target)
5587 bool is_weakref = false;
5589 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
5591 tree alias = DECL_ASSEMBLER_NAME (decl);
5595 ultimate_transparent_alias_target (&target);
5597 if (alias == target)
5598 error ("weakref %q+D ultimately targets itself", decl);
5601 #ifndef ASM_OUTPUT_WEAKREF
5602 IDENTIFIER_TRANSPARENT_ALIAS (alias) = 1;
5603 TREE_CHAIN (alias) = target;
5606 if (TREE_PUBLIC (decl))
5607 error ("weakref %q+D must have static linkage", decl);
5611 #if !defined (ASM_OUTPUT_DEF)
5612 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5613 error_at (DECL_SOURCE_LOCATION (decl),
5614 "alias definitions not supported in this configuration");
5617 if (!DECL_WEAK (decl))
5619 error_at (DECL_SOURCE_LOCATION (decl),
5620 "only weak aliases are supported in this configuration");
5627 /* We must force creation of DECL_RTL for debug info generation, even though
5628 we don't use it here. */
5629 make_decl_rtl (decl);
5630 TREE_USED (decl) = 1;
5632 /* A quirk of the initial implementation of aliases required that the user
5633 add "extern" to all of them. Which is silly, but now historical. Do
5634 note that the symbol is in fact locally defined. */
5636 DECL_EXTERNAL (decl) = 0;
5638 /* Allow aliases to aliases. */
5639 if (TREE_CODE (decl) == FUNCTION_DECL)
5640 cgraph_node (decl)->alias = true;
5642 varpool_node (decl)->alias = true;
5644 /* If the target has already been emitted, we don't have to queue the
5645 alias. This saves a tad of memory. */
5646 if (cgraph_global_info_ready)
5647 target_decl = find_decl_and_mark_needed (decl, target);
5650 if (target_decl && TREE_ASM_WRITTEN (target_decl))
5651 do_assemble_alias (decl, target);
5654 alias_pair *p = VEC_safe_push (alias_pair, gc, alias_pairs, NULL);
5660 /* Emit an assembler directive to set symbol for DECL visibility to
5661 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5664 default_assemble_visibility (tree decl, int vis)
5666 static const char * const visibility_types[] = {
5667 NULL, "protected", "hidden", "internal"
5670 const char *name, *type;
5672 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5673 type = visibility_types[vis];
5675 #ifdef HAVE_GAS_HIDDEN
5676 fprintf (asm_out_file, "\t.%s\t", type);
5677 assemble_name (asm_out_file, name);
5678 fprintf (asm_out_file, "\n");
5680 warning (OPT_Wattributes, "visibility attribute not supported "
5681 "in this configuration; ignored");
5685 /* A helper function to call assemble_visibility when needed for a decl. */
5688 maybe_assemble_visibility (tree decl)
5690 enum symbol_visibility vis = DECL_VISIBILITY (decl);
5692 if (vis != VISIBILITY_DEFAULT)
5694 targetm.asm_out.visibility (decl, vis);
5701 /* Returns 1 if the target configuration supports defining public symbols
5702 so that one of them will be chosen at link time instead of generating a
5703 multiply-defined symbol error, whether through the use of weak symbols or
5704 a target-specific mechanism for having duplicates discarded. */
5707 supports_one_only (void)
5709 if (SUPPORTS_ONE_ONLY)
5711 return SUPPORTS_WEAK;
5714 /* Set up DECL as a public symbol that can be defined in multiple
5715 translation units without generating a linker error. */
5718 make_decl_one_only (tree decl, tree comdat_group)
5720 gcc_assert (TREE_CODE (decl) == VAR_DECL
5721 || TREE_CODE (decl) == FUNCTION_DECL);
5723 TREE_PUBLIC (decl) = 1;
5725 if (SUPPORTS_ONE_ONLY)
5727 #ifdef MAKE_DECL_ONE_ONLY
5728 MAKE_DECL_ONE_ONLY (decl);
5730 DECL_COMDAT_GROUP (decl) = comdat_group;
5732 else if (TREE_CODE (decl) == VAR_DECL
5733 && (DECL_INITIAL (decl) == 0 || DECL_INITIAL (decl) == error_mark_node))
5734 DECL_COMMON (decl) = 1;
5737 gcc_assert (SUPPORTS_WEAK);
5738 DECL_WEAK (decl) = 1;
5743 init_varasm_once (void)
5745 section_htab = htab_create_ggc (31, section_entry_hash,
5746 section_entry_eq, NULL);
5747 object_block_htab = htab_create_ggc (31, object_block_entry_hash,
5748 object_block_entry_eq, NULL);
5749 const_desc_htab = htab_create_ggc (1009, const_desc_hash,
5750 const_desc_eq, NULL);
5752 const_alias_set = new_alias_set ();
5753 shared_constant_pool = create_constant_pool ();
5755 #ifdef TEXT_SECTION_ASM_OP
5756 text_section = get_unnamed_section (SECTION_CODE, output_section_asm_op,
5757 TEXT_SECTION_ASM_OP);
5760 #ifdef DATA_SECTION_ASM_OP
5761 data_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
5762 DATA_SECTION_ASM_OP);
5765 #ifdef SDATA_SECTION_ASM_OP
5766 sdata_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
5767 SDATA_SECTION_ASM_OP);
5770 #ifdef READONLY_DATA_SECTION_ASM_OP
5771 readonly_data_section = get_unnamed_section (0, output_section_asm_op,
5772 READONLY_DATA_SECTION_ASM_OP);
5775 #ifdef CTORS_SECTION_ASM_OP
5776 ctors_section = get_unnamed_section (0, output_section_asm_op,
5777 CTORS_SECTION_ASM_OP);
5780 #ifdef DTORS_SECTION_ASM_OP
5781 dtors_section = get_unnamed_section (0, output_section_asm_op,
5782 DTORS_SECTION_ASM_OP);
5785 #ifdef BSS_SECTION_ASM_OP
5786 bss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
5787 output_section_asm_op,
5788 BSS_SECTION_ASM_OP);
5791 #ifdef SBSS_SECTION_ASM_OP
5792 sbss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
5793 output_section_asm_op,
5794 SBSS_SECTION_ASM_OP);
5797 tls_comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5798 | SECTION_COMMON, emit_tls_common);
5799 lcomm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5800 | SECTION_COMMON, emit_local);
5801 comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5802 | SECTION_COMMON, emit_common);
5804 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
5805 bss_noswitch_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS,
5809 targetm.asm_out.init_sections ();
5811 if (readonly_data_section == NULL)
5812 readonly_data_section = text_section;
5816 decl_default_tls_model (const_tree decl)
5818 enum tls_model kind;
5821 is_local = targetm.binds_local_p (decl);
5825 kind = TLS_MODEL_LOCAL_EXEC;
5827 kind = TLS_MODEL_INITIAL_EXEC;
5830 /* Local dynamic is inefficient when we're not combining the
5831 parts of the address. */
5832 else if (optimize && is_local)
5833 kind = TLS_MODEL_LOCAL_DYNAMIC;
5835 kind = TLS_MODEL_GLOBAL_DYNAMIC;
5836 if (kind < flag_tls_default)
5837 kind = flag_tls_default;
5842 /* Select a set of attributes for section NAME based on the properties
5843 of DECL and whether or not RELOC indicates that DECL's initializer
5844 might contain runtime relocations.
5846 We make the section read-only and executable for a function decl,
5847 read-only for a const data decl, and writable for a non-const data decl. */
5850 default_section_type_flags (tree decl, const char *name, int reloc)
5854 if (decl && TREE_CODE (decl) == FUNCTION_DECL)
5855 flags = SECTION_CODE;
5856 else if (decl && decl_readonly_section (decl, reloc))
5858 else if (current_function_decl
5860 && crtl->subsections.unlikely_text_section_name
5861 && strcmp (name, crtl->subsections.unlikely_text_section_name) == 0)
5862 flags = SECTION_CODE;
5864 && (!current_function_decl || !cfun)
5865 && strcmp (name, UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
5866 flags = SECTION_CODE;
5868 flags = SECTION_WRITE;
5870 if (decl && DECL_ONE_ONLY (decl))
5871 flags |= SECTION_LINKONCE;
5873 if (decl && TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
5874 flags |= SECTION_TLS | SECTION_WRITE;
5876 if (strcmp (name, ".bss") == 0
5877 || strncmp (name, ".bss.", 5) == 0
5878 || strncmp (name, ".gnu.linkonce.b.", 16) == 0
5879 || strcmp (name, ".sbss") == 0
5880 || strncmp (name, ".sbss.", 6) == 0
5881 || strncmp (name, ".gnu.linkonce.sb.", 17) == 0)
5882 flags |= SECTION_BSS;
5884 if (strcmp (name, ".tdata") == 0
5885 || strncmp (name, ".tdata.", 7) == 0
5886 || strncmp (name, ".gnu.linkonce.td.", 17) == 0)
5887 flags |= SECTION_TLS;
5889 if (strcmp (name, ".tbss") == 0
5890 || strncmp (name, ".tbss.", 6) == 0
5891 || strncmp (name, ".gnu.linkonce.tb.", 17) == 0)
5892 flags |= SECTION_TLS | SECTION_BSS;
5894 /* These three sections have special ELF types. They are neither
5895 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
5896 want to print a section type (@progbits or @nobits). If someone
5897 is silly enough to emit code or TLS variables to one of these
5898 sections, then don't handle them specially. */
5899 if (!(flags & (SECTION_CODE | SECTION_BSS | SECTION_TLS))
5900 && (strcmp (name, ".init_array") == 0
5901 || strcmp (name, ".fini_array") == 0
5902 || strcmp (name, ".preinit_array") == 0))
5903 flags |= SECTION_NOTYPE;
5908 /* Return true if the target supports some form of global BSS,
5909 either through bss_noswitch_section, or by selecting a BSS
5910 section in TARGET_ASM_SELECT_SECTION. */
5913 have_global_bss_p (void)
5915 return bss_noswitch_section || targetm.have_switchable_bss_sections;
5918 /* Output assembly to switch to section NAME with attribute FLAGS.
5919 Four variants for common object file formats. */
5922 default_no_named_section (const char *name ATTRIBUTE_UNUSED,
5923 unsigned int flags ATTRIBUTE_UNUSED,
5924 tree decl ATTRIBUTE_UNUSED)
5926 /* Some object formats don't support named sections at all. The
5927 front-end should already have flagged this as an error. */
5932 default_elf_asm_named_section (const char *name, unsigned int flags,
5933 tree decl ATTRIBUTE_UNUSED)
5935 char flagchars[10], *f = flagchars;
5937 /* If we have already declared this section, we can use an
5938 abbreviated form to switch back to it -- unless this section is
5939 part of a COMDAT groups, in which case GAS requires the full
5940 declaration every time. */
5941 if (!(HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5942 && (flags & SECTION_DECLARED))
5944 fprintf (asm_out_file, "\t.section\t%s\n", name);
5948 if (!(flags & SECTION_DEBUG))
5950 if (flags & SECTION_WRITE)
5952 if (flags & SECTION_CODE)
5954 if (flags & SECTION_SMALL)
5956 if (flags & SECTION_MERGE)
5958 if (flags & SECTION_STRINGS)
5960 if (flags & SECTION_TLS)
5962 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5966 fprintf (asm_out_file, "\t.section\t%s,\"%s\"", name, flagchars);
5968 if (!(flags & SECTION_NOTYPE))
5973 if (flags & SECTION_BSS)
5979 #ifdef ASM_COMMENT_START
5980 /* On platforms that use "@" as the assembly comment character,
5982 if (strcmp (ASM_COMMENT_START, "@") == 0)
5985 fprintf (asm_out_file, format, type);
5987 if (flags & SECTION_ENTSIZE)
5988 fprintf (asm_out_file, ",%d", flags & SECTION_ENTSIZE);
5989 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5990 fprintf (asm_out_file, ",%s,comdat",
5991 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl)));
5994 putc ('\n', asm_out_file);
5998 default_coff_asm_named_section (const char *name, unsigned int flags,
5999 tree decl ATTRIBUTE_UNUSED)
6001 char flagchars[8], *f = flagchars;
6003 if (flags & SECTION_WRITE)
6005 if (flags & SECTION_CODE)
6009 fprintf (asm_out_file, "\t.section\t%s,\"%s\"\n", name, flagchars);
6013 default_pe_asm_named_section (const char *name, unsigned int flags,
6016 default_coff_asm_named_section (name, flags, decl);
6018 if (flags & SECTION_LINKONCE)
6020 /* Functions may have been compiled at various levels of
6021 optimization so we can't use `same_size' here.
6022 Instead, have the linker pick one. */
6023 fprintf (asm_out_file, "\t.linkonce %s\n",
6024 (flags & SECTION_CODE ? "discard" : "same_size"));
6028 /* The lame default section selector. */
6031 default_select_section (tree decl, int reloc,
6032 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
6036 if (decl_readonly_section (decl, reloc))
6037 return readonly_data_section;
6039 else if (TREE_CODE (decl) == CONSTRUCTOR)
6041 if (! ((flag_pic && reloc)
6042 || !TREE_READONLY (decl)
6043 || TREE_SIDE_EFFECTS (decl)
6044 || !TREE_CONSTANT (decl)))
6045 return readonly_data_section;
6047 else if (TREE_CODE (decl) == STRING_CST)
6048 return readonly_data_section;
6049 else if (! (flag_pic && reloc))
6050 return readonly_data_section;
6052 return data_section;
6055 enum section_category
6056 categorize_decl_for_section (const_tree decl, int reloc)
6058 enum section_category ret;
6060 if (TREE_CODE (decl) == FUNCTION_DECL)
6062 else if (TREE_CODE (decl) == STRING_CST)
6064 if (flag_mudflap) /* or !flag_merge_constants */
6065 return SECCAT_RODATA;
6067 return SECCAT_RODATA_MERGE_STR;
6069 else if (TREE_CODE (decl) == VAR_DECL)
6071 if (bss_initializer_p (decl))
6073 else if (! TREE_READONLY (decl)
6074 || TREE_SIDE_EFFECTS (decl)
6075 || ! TREE_CONSTANT (DECL_INITIAL (decl)))
6077 /* Here the reloc_rw_mask is not testing whether the section should
6078 be read-only or not, but whether the dynamic link will have to
6079 do something. If so, we wish to segregate the data in order to
6080 minimize cache misses inside the dynamic linker. */
6081 if (reloc & targetm.asm_out.reloc_rw_mask ())
6082 ret = reloc == 1 ? SECCAT_DATA_REL_LOCAL : SECCAT_DATA_REL;
6086 else if (reloc & targetm.asm_out.reloc_rw_mask ())
6087 ret = reloc == 1 ? SECCAT_DATA_REL_RO_LOCAL : SECCAT_DATA_REL_RO;
6088 else if (reloc || flag_merge_constants < 2)
6089 /* C and C++ don't allow different variables to share the same
6090 location. -fmerge-all-constants allows even that (at the
6091 expense of not conforming). */
6092 ret = SECCAT_RODATA;
6093 else if (TREE_CODE (DECL_INITIAL (decl)) == STRING_CST)
6094 ret = SECCAT_RODATA_MERGE_STR_INIT;
6096 ret = SECCAT_RODATA_MERGE_CONST;
6098 else if (TREE_CODE (decl) == CONSTRUCTOR)
6100 if ((reloc & targetm.asm_out.reloc_rw_mask ())
6101 || TREE_SIDE_EFFECTS (decl)
6102 || ! TREE_CONSTANT (decl))
6105 ret = SECCAT_RODATA;
6108 ret = SECCAT_RODATA;
6110 /* There are no read-only thread-local sections. */
6111 if (TREE_CODE (decl) == VAR_DECL && DECL_TLS_MODEL (decl))
6113 if (DECL_TLS_MODEL (decl) == TLS_MODEL_EMULATED)
6115 if (DECL_EMUTLS_VAR_P (decl))
6117 if (targetm.emutls.var_section)
6118 ret = SECCAT_EMUTLS_VAR;
6122 if (targetm.emutls.tmpl_prefix)
6123 ret = SECCAT_EMUTLS_TMPL;
6126 /* Note that this would be *just* SECCAT_BSS, except that there's
6127 no concept of a read-only thread-local-data section. */
6128 else if (ret == SECCAT_BSS
6129 || (flag_zero_initialized_in_bss
6130 && initializer_zerop (DECL_INITIAL (decl))))
6136 /* If the target uses small data sections, select it. */
6137 else if (targetm.in_small_data_p (decl))
6139 if (ret == SECCAT_BSS)
6141 else if (targetm.have_srodata_section && ret == SECCAT_RODATA)
6142 ret = SECCAT_SRODATA;
6151 decl_readonly_section (const_tree decl, int reloc)
6153 switch (categorize_decl_for_section (decl, reloc))
6156 case SECCAT_RODATA_MERGE_STR:
6157 case SECCAT_RODATA_MERGE_STR_INIT:
6158 case SECCAT_RODATA_MERGE_CONST:
6159 case SECCAT_SRODATA:
6168 /* Select a section based on the above categorization. */
6171 default_elf_select_section (tree decl, int reloc,
6172 unsigned HOST_WIDE_INT align)
6175 switch (categorize_decl_for_section (decl, reloc))
6178 /* We're not supposed to be called on FUNCTION_DECLs. */
6181 return readonly_data_section;
6182 case SECCAT_RODATA_MERGE_STR:
6183 return mergeable_string_section (decl, align, 0);
6184 case SECCAT_RODATA_MERGE_STR_INIT:
6185 return mergeable_string_section (DECL_INITIAL (decl), align, 0);
6186 case SECCAT_RODATA_MERGE_CONST:
6187 return mergeable_constant_section (DECL_MODE (decl), align, 0);
6188 case SECCAT_SRODATA:
6192 return data_section;
6193 case SECCAT_DATA_REL:
6194 sname = ".data.rel";
6196 case SECCAT_DATA_REL_LOCAL:
6197 sname = ".data.rel.local";
6199 case SECCAT_DATA_REL_RO:
6200 sname = ".data.rel.ro";
6202 case SECCAT_DATA_REL_RO_LOCAL:
6203 sname = ".data.rel.ro.local";
6222 case SECCAT_EMUTLS_VAR:
6223 sname = targetm.emutls.var_section;
6225 case SECCAT_EMUTLS_TMPL:
6226 sname = targetm.emutls.tmpl_section;
6234 return get_named_section (decl, sname, reloc);
6237 /* Construct a unique section name based on the decl name and the
6238 categorization performed above. */
6241 default_unique_section (tree decl, int reloc)
6243 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6244 bool one_only = DECL_ONE_ONLY (decl) && !HAVE_COMDAT_GROUP;
6245 const char *prefix, *name, *linkonce;
6248 switch (categorize_decl_for_section (decl, reloc))
6251 prefix = one_only ? ".t" : ".text";
6254 case SECCAT_RODATA_MERGE_STR:
6255 case SECCAT_RODATA_MERGE_STR_INIT:
6256 case SECCAT_RODATA_MERGE_CONST:
6257 prefix = one_only ? ".r" : ".rodata";
6259 case SECCAT_SRODATA:
6260 prefix = one_only ? ".s2" : ".sdata2";
6263 prefix = one_only ? ".d" : ".data";
6265 case SECCAT_DATA_REL:
6266 prefix = one_only ? ".d.rel" : ".data.rel";
6268 case SECCAT_DATA_REL_LOCAL:
6269 prefix = one_only ? ".d.rel.local" : ".data.rel.local";
6271 case SECCAT_DATA_REL_RO:
6272 prefix = one_only ? ".d.rel.ro" : ".data.rel.ro";
6274 case SECCAT_DATA_REL_RO_LOCAL:
6275 prefix = one_only ? ".d.rel.ro.local" : ".data.rel.ro.local";
6278 prefix = one_only ? ".s" : ".sdata";
6281 prefix = one_only ? ".b" : ".bss";
6284 prefix = one_only ? ".sb" : ".sbss";
6287 prefix = one_only ? ".td" : ".tdata";
6290 prefix = one_only ? ".tb" : ".tbss";
6292 case SECCAT_EMUTLS_VAR:
6293 prefix = targetm.emutls.var_section;
6295 case SECCAT_EMUTLS_TMPL:
6296 prefix = targetm.emutls.tmpl_section;
6302 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
6303 name = targetm.strip_name_encoding (name);
6305 /* If we're using one_only, then there needs to be a .gnu.linkonce
6306 prefix to the section name. */
6307 linkonce = one_only ? ".gnu.linkonce" : "";
6309 string = ACONCAT ((linkonce, prefix, ".", name, NULL));
6311 DECL_SECTION_NAME (decl) = build_string (strlen (string), string);
6314 /* Like compute_reloc_for_constant, except for an RTX. The return value
6315 is a mask for which bit 1 indicates a global relocation, and bit 0
6316 indicates a local relocation. */
6319 compute_reloc_for_rtx_1 (rtx *xp, void *data)
6321 int *preloc = (int *) data;
6324 switch (GET_CODE (x))
6327 *preloc |= SYMBOL_REF_LOCAL_P (x) ? 1 : 2;
6340 compute_reloc_for_rtx (rtx x)
6344 switch (GET_CODE (x))
6350 for_each_rtx (&x, compute_reloc_for_rtx_1, &reloc);
6359 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED,
6361 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
6363 if (compute_reloc_for_rtx (x) & targetm.asm_out.reloc_rw_mask ())
6364 return data_section;
6366 return readonly_data_section;
6370 default_elf_select_rtx_section (enum machine_mode mode, rtx x,
6371 unsigned HOST_WIDE_INT align)
6373 int reloc = compute_reloc_for_rtx (x);
6375 /* ??? Handle small data here somehow. */
6377 if (reloc & targetm.asm_out.reloc_rw_mask ())
6380 return get_named_section (NULL, ".data.rel.ro.local", 1);
6382 return get_named_section (NULL, ".data.rel.ro", 3);
6385 return mergeable_constant_section (mode, align, 0);
6388 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6391 default_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
6396 /* Careful not to prod global register variables. */
6399 symbol = XEXP (rtl, 0);
6400 if (GET_CODE (symbol) != SYMBOL_REF)
6403 flags = SYMBOL_REF_FLAGS (symbol) & SYMBOL_FLAG_HAS_BLOCK_INFO;
6404 if (TREE_CODE (decl) == FUNCTION_DECL)
6405 flags |= SYMBOL_FLAG_FUNCTION;
6406 if (targetm.binds_local_p (decl))
6407 flags |= SYMBOL_FLAG_LOCAL;
6408 if (targetm.have_tls && TREE_CODE (decl) == VAR_DECL
6409 && DECL_THREAD_LOCAL_P (decl))
6410 flags |= DECL_TLS_MODEL (decl) << SYMBOL_FLAG_TLS_SHIFT;
6411 else if (targetm.in_small_data_p (decl))
6412 flags |= SYMBOL_FLAG_SMALL;
6413 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6414 being PUBLIC, the thing *must* be defined in this translation unit.
6415 Prevent this buglet from being propagated into rtl code as well. */
6416 if (DECL_P (decl) && DECL_EXTERNAL (decl) && TREE_PUBLIC (decl))
6417 flags |= SYMBOL_FLAG_EXTERNAL;
6419 SYMBOL_REF_FLAGS (symbol) = flags;
6422 /* By default, we do nothing for encode_section_info, so we need not
6423 do anything but discard the '*' marker. */
6426 default_strip_name_encoding (const char *str)
6428 return str + (*str == '*');
6431 #ifdef ASM_OUTPUT_DEF
6432 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6433 anchor relative to ".", the current section position. */
6436 default_asm_output_anchor (rtx symbol)
6440 sprintf (buffer, "*. + " HOST_WIDE_INT_PRINT_DEC,
6441 SYMBOL_REF_BLOCK_OFFSET (symbol));
6442 ASM_OUTPUT_DEF (asm_out_file, XSTR (symbol, 0), buffer);
6446 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6449 default_use_anchors_for_symbol_p (const_rtx symbol)
6454 /* Don't use anchors for mergeable sections. The linker might move
6455 the objects around. */
6456 sect = SYMBOL_REF_BLOCK (symbol)->sect;
6457 if (sect->common.flags & SECTION_MERGE)
6460 /* Don't use anchors for small data sections. The small data register
6461 acts as an anchor for such sections. */
6462 if (sect->common.flags & SECTION_SMALL)
6465 decl = SYMBOL_REF_DECL (symbol);
6466 if (decl && DECL_P (decl))
6468 /* Don't use section anchors for decls that might be defined by
6470 if (!targetm.binds_local_p (decl))
6473 /* Don't use section anchors for decls that will be placed in a
6474 small data section. */
6475 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6476 one above. The problem is that we only use SECTION_SMALL for
6477 sections that should be marked as small in the section directive. */
6478 if (targetm.in_small_data_p (decl))
6484 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6485 wrt cross-module name binding. */
6488 default_binds_local_p (const_tree exp)
6490 return default_binds_local_p_1 (exp, flag_shlib);
6494 default_binds_local_p_1 (const_tree exp, int shlib)
6498 /* A non-decl is an entry in the constant pool. */
6501 /* Weakrefs may not bind locally, even though the weakref itself is
6502 always static and therefore local. */
6503 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp)))
6505 /* Static variables are always local. */
6506 else if (! TREE_PUBLIC (exp))
6508 /* A variable is local if the user has said explicitly that it will
6510 else if (DECL_VISIBILITY_SPECIFIED (exp)
6511 && DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
6513 /* Variables defined outside this object might not be local. */
6514 else if (DECL_EXTERNAL (exp))
6516 /* If defined in this object and visibility is not default, must be
6518 else if (DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
6520 /* Default visibility weak data can be overridden by a strong symbol
6521 in another module and so are not local. */
6522 else if (DECL_WEAK (exp))
6524 /* If PIC, then assume that any global name can be overridden by
6525 symbols resolved from other modules, unless we are compiling with
6526 -fwhole-program, which assumes that names are local. */
6528 local_p = flag_whole_program;
6529 /* Uninitialized COMMON variable may be unified with symbols
6530 resolved from other modules. */
6531 else if (DECL_COMMON (exp)
6532 && (DECL_INITIAL (exp) == NULL
6533 || DECL_INITIAL (exp) == error_mark_node))
6535 /* Otherwise we're left with initialized (or non-common) global data
6536 which is of necessity defined locally. */
6543 /* Determine whether or not a pointer mode is valid. Assume defaults
6544 of ptr_mode or Pmode - can be overridden. */
6546 default_valid_pointer_mode (enum machine_mode mode)
6548 return (mode == ptr_mode || mode == Pmode);
6551 /* Default function to output code that will globalize a label. A
6552 target must define GLOBAL_ASM_OP or provide its own function to
6553 globalize a label. */
6554 #ifdef GLOBAL_ASM_OP
6556 default_globalize_label (FILE * stream, const char *name)
6558 fputs (GLOBAL_ASM_OP, stream);
6559 assemble_name (stream, name);
6560 putc ('\n', stream);
6562 #endif /* GLOBAL_ASM_OP */
6564 /* Default function to output code that will globalize a declaration. */
6566 default_globalize_decl_name (FILE * stream, tree decl)
6568 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
6569 targetm.asm_out.globalize_label (stream, name);
6572 /* Default function to output a label for unwind information. The
6573 default is to do nothing. A target that needs nonlocal labels for
6574 unwind information must provide its own function to do this. */
6576 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED,
6577 tree decl ATTRIBUTE_UNUSED,
6578 int for_eh ATTRIBUTE_UNUSED,
6579 int empty ATTRIBUTE_UNUSED)
6583 /* Default function to output a label to divide up the exception table.
6584 The default is to do nothing. A target that needs/wants to divide
6585 up the table must provide it's own function to do this. */
6587 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED)
6591 /* This is how to output an internal numbered label where PREFIX is
6592 the class of label and LABELNO is the number within the class. */
6595 default_internal_label (FILE *stream, const char *prefix,
6596 unsigned long labelno)
6598 char *const buf = (char *) alloca (40 + strlen (prefix));
6599 ASM_GENERATE_INTERNAL_LABEL (buf, prefix, labelno);
6600 ASM_OUTPUT_INTERNAL_LABEL (stream, buf);
6603 /* This is the default behavior at the beginning of a file. It's
6604 controlled by two other target-hook toggles. */
6606 default_file_start (void)
6608 if (targetm.file_start_app_off
6609 && !(flag_verbose_asm || flag_debug_asm || flag_dump_rtl_in_asm))
6610 fputs (ASM_APP_OFF, asm_out_file);
6612 if (targetm.file_start_file_directive)
6613 output_file_directive (asm_out_file, main_input_filename);
6616 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6617 which emits a special section directive used to indicate whether or
6618 not this object file needs an executable stack. This is primarily
6619 a GNU extension to ELF but could be used on other targets. */
6621 int trampolines_created;
6624 file_end_indicate_exec_stack (void)
6626 unsigned int flags = SECTION_DEBUG;
6627 if (trampolines_created)
6628 flags |= SECTION_CODE;
6630 switch_to_section (get_section (".note.GNU-stack", flags, NULL));
6633 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6634 a get_unnamed_section callback. */
6637 output_section_asm_op (const void *directive)
6639 fprintf (asm_out_file, "%s\n", (const char *) directive);
6642 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6643 the current section is NEW_SECTION. */
6646 switch_to_section (section *new_section)
6648 if (in_section == new_section)
6651 if (new_section->common.flags & SECTION_FORGET)
6654 in_section = new_section;
6656 switch (SECTION_STYLE (new_section))
6660 && !crtl->subsections.unlikely_text_section_name
6661 && strcmp (new_section->named.name,
6662 UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
6663 crtl->subsections.unlikely_text_section_name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
6665 targetm.asm_out.named_section (new_section->named.name,
6666 new_section->named.common.flags,
6667 new_section->named.decl);
6670 case SECTION_UNNAMED:
6671 new_section->unnamed.callback (new_section->unnamed.data);
6674 case SECTION_NOSWITCH:
6679 new_section->common.flags |= SECTION_DECLARED;
6682 /* If block symbol SYMBOL has not yet been assigned an offset, place
6683 it at the end of its block. */
6686 place_block_symbol (rtx symbol)
6688 unsigned HOST_WIDE_INT size, mask, offset;
6689 struct constant_descriptor_rtx *desc;
6690 unsigned int alignment;
6691 struct object_block *block;
6694 gcc_assert (SYMBOL_REF_BLOCK (symbol));
6695 if (SYMBOL_REF_BLOCK_OFFSET (symbol) >= 0)
6698 /* Work out the symbol's size and alignment. */
6699 if (CONSTANT_POOL_ADDRESS_P (symbol))
6701 desc = SYMBOL_REF_CONSTANT (symbol);
6702 alignment = desc->align;
6703 size = GET_MODE_SIZE (desc->mode);
6705 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
6707 decl = SYMBOL_REF_DECL (symbol);
6708 alignment = get_constant_alignment (decl);
6709 size = get_constant_size (decl);
6713 decl = SYMBOL_REF_DECL (symbol);
6714 alignment = DECL_ALIGN (decl);
6715 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
6718 /* Calculate the object's offset from the start of the block. */
6719 block = SYMBOL_REF_BLOCK (symbol);
6720 mask = alignment / BITS_PER_UNIT - 1;
6721 offset = (block->size + mask) & ~mask;
6722 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
6724 /* Record the block's new alignment and size. */
6725 block->alignment = MAX (block->alignment, alignment);
6726 block->size = offset + size;
6728 VEC_safe_push (rtx, gc, block->objects, symbol);
6731 /* Return the anchor that should be used to address byte offset OFFSET
6732 from the first object in BLOCK. MODEL is the TLS model used
6736 get_section_anchor (struct object_block *block, HOST_WIDE_INT offset,
6737 enum tls_model model)
6740 unsigned int begin, middle, end;
6741 unsigned HOST_WIDE_INT min_offset, max_offset, range, bias, delta;
6744 /* Work out the anchor's offset. Use an offset of 0 for the first
6745 anchor so that we don't pessimize the case where we take the address
6746 of a variable at the beginning of the block. This is particularly
6747 useful when a block has only one variable assigned to it.
6749 We try to place anchors RANGE bytes apart, so there can then be
6750 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
6751 a ptr_mode offset. With some target settings, the lowest such
6752 anchor might be out of range for the lowest ptr_mode offset;
6753 likewise the highest anchor for the highest offset. Use anchors
6754 at the extreme ends of the ptr_mode range in such cases.
6756 All arithmetic uses unsigned integers in order to avoid
6758 max_offset = (unsigned HOST_WIDE_INT) targetm.max_anchor_offset;
6759 min_offset = (unsigned HOST_WIDE_INT) targetm.min_anchor_offset;
6760 range = max_offset - min_offset + 1;
6765 bias = 1 << (GET_MODE_BITSIZE (ptr_mode) - 1);
6768 delta = -(unsigned HOST_WIDE_INT) offset + max_offset;
6769 delta -= delta % range;
6772 offset = (HOST_WIDE_INT) (-delta);
6776 delta = (unsigned HOST_WIDE_INT) offset - min_offset;
6777 delta -= delta % range;
6778 if (delta > bias - 1)
6780 offset = (HOST_WIDE_INT) delta;
6784 /* Do a binary search to see if there's already an anchor we can use.
6785 Set BEGIN to the new anchor's index if not. */
6787 end = VEC_length (rtx, block->anchors);
6788 while (begin != end)
6790 middle = (end + begin) / 2;
6791 anchor = VEC_index (rtx, block->anchors, middle);
6792 if (SYMBOL_REF_BLOCK_OFFSET (anchor) > offset)
6794 else if (SYMBOL_REF_BLOCK_OFFSET (anchor) < offset)
6796 else if (SYMBOL_REF_TLS_MODEL (anchor) > model)
6798 else if (SYMBOL_REF_TLS_MODEL (anchor) < model)
6804 /* Create a new anchor with a unique label. */
6805 ASM_GENERATE_INTERNAL_LABEL (label, "LANCHOR", anchor_labelno++);
6806 anchor = create_block_symbol (ggc_strdup (label), block, offset);
6807 SYMBOL_REF_FLAGS (anchor) |= SYMBOL_FLAG_LOCAL | SYMBOL_FLAG_ANCHOR;
6808 SYMBOL_REF_FLAGS (anchor) |= model << SYMBOL_FLAG_TLS_SHIFT;
6810 /* Insert it at index BEGIN. */
6811 VEC_safe_insert (rtx, gc, block->anchors, begin, anchor);
6815 /* Output the objects in BLOCK. */
6818 output_object_block (struct object_block *block)
6820 struct constant_descriptor_rtx *desc;
6822 HOST_WIDE_INT offset;
6826 if (block->objects == NULL)
6829 /* Switch to the section and make sure that the first byte is
6830 suitably aligned. */
6831 switch_to_section (block->sect);
6832 assemble_align (block->alignment);
6834 /* Define the values of all anchors relative to the current section
6836 for (i = 0; VEC_iterate (rtx, block->anchors, i, symbol); i++)
6837 targetm.asm_out.output_anchor (symbol);
6839 /* Output the objects themselves. */
6841 for (i = 0; VEC_iterate (rtx, block->objects, i, symbol); i++)
6843 /* Move to the object's offset, padding with zeros if necessary. */
6844 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol) - offset);
6845 offset = SYMBOL_REF_BLOCK_OFFSET (symbol);
6846 if (CONSTANT_POOL_ADDRESS_P (symbol))
6848 desc = SYMBOL_REF_CONSTANT (symbol);
6849 output_constant_pool_1 (desc, 1);
6850 offset += GET_MODE_SIZE (desc->mode);
6852 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
6854 decl = SYMBOL_REF_DECL (symbol);
6855 assemble_constant_contents (decl, XSTR (symbol, 0),
6856 get_constant_alignment (decl));
6857 offset += get_constant_size (decl);
6861 decl = SYMBOL_REF_DECL (symbol);
6862 assemble_variable_contents (decl, XSTR (symbol, 0), false);
6863 offset += tree_low_cst (DECL_SIZE_UNIT (decl), 1);
6868 /* A htab_traverse callback used to call output_object_block for
6869 each member of object_block_htab. */
6872 output_object_block_htab (void **slot, void *data ATTRIBUTE_UNUSED)
6874 output_object_block ((struct object_block *) (*slot));
6878 /* Output the definitions of all object_blocks. */
6881 output_object_blocks (void)
6883 htab_traverse (object_block_htab, output_object_block_htab, NULL);
6886 /* This function provides a possible implementation of the
6887 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
6888 by -frecord-gcc-switches it creates a new mergeable, string section in the
6889 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
6890 contains the switches in ASCII format.
6892 FIXME: This code does not correctly handle double quote characters
6893 that appear inside strings, (it strips them rather than preserving them).
6894 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
6895 characters - instead it treats them as sub-string separators. Since
6896 we want to emit NUL strings terminators into the object file we have to use
6900 elf_record_gcc_switches (print_switch_type type, const char * name)
6902 static char buffer[1024];
6904 /* This variable is used as part of a simplistic heuristic to detect
6905 command line switches which take an argument:
6907 "If a command line option does not start with a dash then
6908 it is an argument for the previous command line option."
6910 This fails in the case of the command line option which is the name
6911 of the file to compile, but otherwise it is pretty reasonable. */
6912 static bool previous_name_held_back = FALSE;
6916 case SWITCH_TYPE_PASSED:
6919 if (previous_name_held_back)
6921 unsigned int len = strlen (buffer);
6923 snprintf (buffer + len, sizeof buffer - len, " %s", name);
6924 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
6925 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
6926 previous_name_held_back = FALSE;
6930 strncpy (buffer, name, sizeof buffer);
6931 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
6932 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
6937 if (previous_name_held_back)
6939 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
6940 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
6943 strncpy (buffer, name, sizeof buffer);
6944 previous_name_held_back = TRUE;
6948 case SWITCH_TYPE_DESCRIPTIVE:
6951 /* Distinguish between invocations where name is NULL. */
6952 static bool started = false;
6956 if (previous_name_held_back)
6958 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
6959 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
6966 sec = get_section (targetm.asm_out.record_gcc_switches_section,
6970 | (SECTION_ENTSIZE & 1),
6972 switch_to_section (sec);
6981 /* The return value is currently ignored by the caller, but must be 0.
6982 For -fverbose-asm the return value would be the number of characters
6983 emitted into the assembler file. */
6987 /* Emit text to declare externally defined symbols. It is needed to
6988 properly support non-default visibility. */
6990 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED,
6992 const char *name ATTRIBUTE_UNUSED)
6994 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
6995 set in order to avoid putting out names that are never really
6997 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
6998 && targetm.binds_local_p (decl))
6999 maybe_assemble_visibility (decl);
7002 #include "gt-varasm.h"