1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997,
3 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 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"
47 #include "langhooks.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 struct varasm_status GTY(())
75 /* If we're using a per-function constant pool, this is it. */
76 struct rtx_constant_pool *pool;
78 /* Number of tree-constants deferred during the expansion of this
80 unsigned int deferred_constants;
83 #define n_deferred_constants (cfun->varasm->deferred_constants)
85 /* Number for making the label on the next
86 constant that is stored in memory. */
88 static GTY(()) int const_labelno;
90 /* Carry information from ASM_DECLARE_OBJECT_NAME
91 to ASM_FINISH_DECLARE_OBJECT. */
93 int size_directive_output;
95 /* The last decl for which assemble_variable was called,
96 if it did ASM_DECLARE_OBJECT_NAME.
97 If the last call to assemble_variable didn't do that,
100 tree last_assemble_variable_decl;
102 /* The following global variable indicates if the first basic block
103 in a function belongs to the cold partition or not. */
105 bool first_function_block_is_cold;
107 /* We give all constants their own alias set. Perhaps redundant with
108 MEM_READONLY_P, but pre-dates it. */
110 static HOST_WIDE_INT const_alias_set;
112 static const char *strip_reg_name (const char *);
113 static int contains_pointers_p (tree);
114 #ifdef ASM_OUTPUT_EXTERNAL
115 static bool incorporeal_function_p (tree);
117 static void decode_addr_const (tree, struct addr_const *);
118 static hashval_t const_desc_hash (const void *);
119 static int const_desc_eq (const void *, const void *);
120 static hashval_t const_hash_1 (const tree);
121 static int compare_constant (const tree, const tree);
122 static tree copy_constant (tree);
123 static void output_constant_def_contents (rtx);
124 static void output_addressed_constants (tree);
125 static unsigned HOST_WIDE_INT array_size_for_constructor (tree);
126 static unsigned min_align (unsigned, unsigned);
127 static void output_constructor (tree, unsigned HOST_WIDE_INT, unsigned int);
128 static void globalize_decl (tree);
129 #ifdef BSS_SECTION_ASM_OP
130 #ifdef ASM_OUTPUT_BSS
131 static void asm_output_bss (FILE *, tree, const char *,
132 unsigned HOST_WIDE_INT, unsigned HOST_WIDE_INT);
134 #ifdef ASM_OUTPUT_ALIGNED_BSS
135 static void asm_output_aligned_bss (FILE *, tree, const char *,
136 unsigned HOST_WIDE_INT, int)
139 #endif /* BSS_SECTION_ASM_OP */
140 static void mark_weak (tree);
141 static void output_constant_pool (const char *, tree);
143 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
144 section *text_section;
145 section *data_section;
146 section *readonly_data_section;
147 section *sdata_section;
148 section *ctors_section;
149 section *dtors_section;
150 section *bss_section;
151 section *sbss_section;
153 /* Various forms of common section. All are guaranteed to be nonnull. */
154 section *tls_comm_section;
155 section *comm_section;
156 section *lcomm_section;
158 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
160 section *bss_noswitch_section;
162 /* The section that holds the main exception table, when known. The section
163 is set either by the target's init_sections hook or by the first call to
164 switch_to_exception_section. */
165 section *exception_section;
167 /* The section that holds the DWARF2 frame unwind information, when known.
168 The section is set either by the target's init_sections hook or by the
169 first call to switch_to_eh_frame_section. */
170 section *eh_frame_section;
172 /* asm_out_file's current section. This is NULL if no section has yet
173 been selected or if we lose track of what the current section is. */
176 /* True if code for the current function is currently being directed
177 at the cold section. */
178 bool in_cold_section_p;
180 /* A linked list of all the unnamed sections. */
181 static GTY(()) section *unnamed_sections;
183 /* Return a nonzero value if DECL has a section attribute. */
184 #ifndef IN_NAMED_SECTION
185 #define IN_NAMED_SECTION(DECL) \
186 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
187 && DECL_SECTION_NAME (DECL) != NULL_TREE)
190 /* Hash table of named sections. */
191 static GTY((param_is (section))) htab_t section_htab;
193 /* A table of object_blocks, indexed by section. */
194 static GTY((param_is (struct object_block))) htab_t object_block_htab;
196 /* The next number to use for internal anchor labels. */
197 static GTY(()) int anchor_labelno;
199 /* A pool of constants that can be shared between functions. */
200 static GTY(()) struct rtx_constant_pool *shared_constant_pool;
204 static GTY ((if_marked ("tree_map_marked_p"), param_is (struct tree_map)))
206 static GTY (()) tree emutls_object_type;
208 #ifndef NO_DOT_IN_LABEL
209 # define EMUTLS_VAR_PREFIX "__emutls_v."
210 # define EMUTLS_TMPL_PREFIX "__emutls_t."
211 #elif !defined NO_DOLLAR_IN_LABEL
212 # define EMUTLS_VAR_PREFIX "__emutls_v$"
213 # define EMUTLS_TMPL_PREFIX "__emutls_t$"
215 # define EMUTLS_VAR_PREFIX "__emutls_v_"
216 # define EMUTLS_TMPL_PREFIX "__emutls_t_"
219 /* Create an identifier for the struct __emutls_object, given an identifier
220 of the DECL_ASSEMBLY_NAME of the original object. */
223 get_emutls_object_name (tree name)
225 char *toname = alloca (strlen (IDENTIFIER_POINTER (name))
226 + sizeof (EMUTLS_VAR_PREFIX));
227 strcpy (toname, EMUTLS_VAR_PREFIX);
228 strcpy (toname + sizeof (EMUTLS_VAR_PREFIX) - 1, IDENTIFIER_POINTER (name));
230 return get_identifier (toname);
233 /* Create the structure for struct __emutls_object. This should match the
234 structure at the top of emutls.c, modulo the union there. */
237 get_emutls_object_type (void)
239 tree type, type_name, field, next_field, word_type_node;
241 type = emutls_object_type;
245 emutls_object_type = type = lang_hooks.types.make_type (RECORD_TYPE);
246 type_name = get_identifier ("__emutls_object");
247 type_name = build_decl (TYPE_DECL, type_name, type);
248 TYPE_NAME (type) = type_name;
250 field = build_decl (FIELD_DECL, get_identifier ("__templ"), ptr_type_node);
251 DECL_CONTEXT (field) = type;
254 field = build_decl (FIELD_DECL, get_identifier ("__offset"), ptr_type_node);
255 DECL_CONTEXT (field) = type;
256 TREE_CHAIN (field) = next_field;
259 word_type_node = lang_hooks.types.type_for_mode (word_mode, 1);
260 field = build_decl (FIELD_DECL, get_identifier ("__align"), word_type_node);
261 DECL_CONTEXT (field) = type;
262 TREE_CHAIN (field) = next_field;
265 field = build_decl (FIELD_DECL, get_identifier ("__size"), word_type_node);
266 DECL_CONTEXT (field) = type;
267 TREE_CHAIN (field) = next_field;
269 TYPE_FIELDS (type) = field;
275 /* Create a read-only variable like DECL, with the same DECL_INITIAL.
276 This will be used for initializing the emulated tls data area. */
279 get_emutls_init_templ_addr (tree decl)
284 if (!DECL_INITIAL (decl))
285 return null_pointer_node;
287 name = DECL_ASSEMBLER_NAME (decl);
288 toname = alloca (strlen (IDENTIFIER_POINTER (name))
289 + sizeof (EMUTLS_TMPL_PREFIX));
290 strcpy (toname, EMUTLS_TMPL_PREFIX);
291 strcpy (toname + sizeof (EMUTLS_TMPL_PREFIX) - 1, IDENTIFIER_POINTER (name));
292 name = get_identifier (toname);
294 to = build_decl (VAR_DECL, name, TREE_TYPE (decl));
295 SET_DECL_ASSEMBLER_NAME (to, DECL_NAME (to));
297 DECL_ARTIFICIAL (to) = 1;
298 TREE_USED (to) = TREE_USED (decl);
299 TREE_READONLY (to) = 1;
300 DECL_IGNORED_P (to) = 1;
301 DECL_CONTEXT (to) = DECL_CONTEXT (decl);
302 DECL_WEAK (to) = DECL_WEAK (decl);
303 if (DECL_ONE_ONLY (decl))
305 make_decl_one_only (to);
306 TREE_STATIC (to) = TREE_STATIC (decl);
307 TREE_PUBLIC (to) = TREE_PUBLIC (decl);
308 DECL_VISIBILITY (to) = DECL_VISIBILITY (decl);
311 TREE_STATIC (to) = 1;
313 DECL_INITIAL (to) = DECL_INITIAL (decl);
314 DECL_INITIAL (decl) = NULL;
316 varpool_finalize_decl (to);
317 return build_fold_addr_expr (to);
320 /* When emulating tls, we use a control structure for use by the runtime.
321 Create and return this structure. */
324 emutls_decl (tree decl)
327 struct tree_map *h, in;
330 if (targetm.have_tls || decl == NULL || decl == error_mark_node
331 || TREE_CODE (decl) != VAR_DECL || ! DECL_THREAD_LOCAL_P (decl))
334 /* Look up the object in the hash; return the control structure if
335 it has already been created. */
337 emutls_htab = htab_create_ggc (512, tree_map_hash, tree_map_eq, 0);
339 name = DECL_ASSEMBLER_NAME (decl);
341 /* Note that we use the hash of the decl's name, rather than a hash
342 of the decl's pointer. In emutls_finish we iterate through the
343 hash table, and we want this traversal to be predictable. */
344 in.hash = htab_hash_string (IDENTIFIER_POINTER (name));
346 loc = htab_find_slot_with_hash (emutls_htab, &in, in.hash, INSERT);
352 to = build_decl (VAR_DECL, get_emutls_object_name (name),
353 get_emutls_object_type ());
355 h = ggc_alloc (sizeof (struct tree_map));
359 *(struct tree_map **) loc = h;
361 DECL_ARTIFICIAL (to) = 1;
362 DECL_IGNORED_P (to) = 1;
363 TREE_READONLY (to) = 0;
365 SET_DECL_ASSEMBLER_NAME (to, DECL_NAME (to));
366 if (DECL_ONE_ONLY (decl))
367 make_decl_one_only (to);
368 DECL_CONTEXT (to) = DECL_CONTEXT (decl);
371 /* Note that these fields may need to be updated from time to time from
372 the original decl. Consider:
373 extern __thread int i;
374 int foo() { return i; }
376 in which I goes from external to locally defined and initialized. */
378 TREE_STATIC (to) = TREE_STATIC (decl);
379 TREE_USED (to) = TREE_USED (decl);
380 TREE_PUBLIC (to) = TREE_PUBLIC (decl);
381 DECL_EXTERNAL (to) = DECL_EXTERNAL (decl);
382 DECL_COMMON (to) = DECL_COMMON (decl);
383 DECL_WEAK (to) = DECL_WEAK (decl);
384 DECL_VISIBILITY (to) = DECL_VISIBILITY (decl);
390 emutls_common_1 (void **loc, void *xstmts)
392 struct tree_map *h = *(struct tree_map **) loc;
393 tree args, x, *pstmts = (tree *) xstmts;
396 if (! DECL_COMMON (h->base.from)
397 || (DECL_INITIAL (h->base.from)
398 && DECL_INITIAL (h->base.from) != error_mark_node))
401 word_type_node = lang_hooks.types.type_for_mode (word_mode, 1);
403 /* The idea was to call get_emutls_init_templ_addr here, but if we
404 do this and there is an initializer, -fanchor_section loses,
405 because it would be too late to ensure the template is
407 x = null_pointer_node;
408 args = tree_cons (NULL, x, NULL);
409 x = build_int_cst (word_type_node, DECL_ALIGN_UNIT (h->base.from));
410 args = tree_cons (NULL, x, args);
411 x = fold_convert (word_type_node, DECL_SIZE_UNIT (h->base.from));
412 args = tree_cons (NULL, x, args);
413 x = build_fold_addr_expr (h->to);
414 args = tree_cons (NULL, x, args);
416 x = built_in_decls[BUILT_IN_EMUTLS_REGISTER_COMMON];
417 x = build_function_call_expr (x, args);
419 append_to_statement_list (x, pstmts);
426 tree body = NULL_TREE;
428 if (emutls_htab == NULL)
431 htab_traverse_noresize (emutls_htab, emutls_common_1, &body);
432 if (body == NULL_TREE)
435 cgraph_build_static_cdtor ('I', body, DEFAULT_INIT_PRIORITY);
438 /* Helper routines for maintaining section_htab. */
441 section_entry_eq (const void *p1, const void *p2)
443 const section *old = p1;
444 const char *new = p2;
446 return strcmp (old->named.name, new) == 0;
450 section_entry_hash (const void *p)
452 const section *old = p;
453 return htab_hash_string (old->named.name);
456 /* Return a hash value for section SECT. */
459 hash_section (section *sect)
461 if (sect->common.flags & SECTION_NAMED)
462 return htab_hash_string (sect->named.name);
463 return sect->common.flags;
466 /* Helper routines for maintaining object_block_htab. */
469 object_block_entry_eq (const void *p1, const void *p2)
471 const struct object_block *old = p1;
472 const section *new = p2;
474 return old->sect == new;
478 object_block_entry_hash (const void *p)
480 const struct object_block *old = p;
481 return hash_section (old->sect);
484 /* Return a new unnamed section with the given fields. */
487 get_unnamed_section (unsigned int flags, void (*callback) (const void *),
492 sect = ggc_alloc (sizeof (struct unnamed_section));
493 sect->unnamed.common.flags = flags | SECTION_UNNAMED;
494 sect->unnamed.callback = callback;
495 sect->unnamed.data = data;
496 sect->unnamed.next = unnamed_sections;
498 unnamed_sections = sect;
502 /* Return a SECTION_NOSWITCH section with the given fields. */
505 get_noswitch_section (unsigned int flags, noswitch_section_callback callback)
509 sect = ggc_alloc (sizeof (struct unnamed_section));
510 sect->noswitch.common.flags = flags | SECTION_NOSWITCH;
511 sect->noswitch.callback = callback;
516 /* Return the named section structure associated with NAME. Create
517 a new section with the given fields if no such structure exists. */
520 get_section (const char *name, unsigned int flags, tree decl)
522 section *sect, **slot;
525 htab_find_slot_with_hash (section_htab, name,
526 htab_hash_string (name), INSERT);
527 flags |= SECTION_NAMED;
530 sect = ggc_alloc (sizeof (struct named_section));
531 sect->named.common.flags = flags;
532 sect->named.name = ggc_strdup (name);
533 sect->named.decl = decl;
539 if ((sect->common.flags & ~SECTION_DECLARED) != flags
540 && ((sect->common.flags | flags) & SECTION_OVERRIDE) == 0)
542 /* Sanity check user variables for flag changes. */
544 decl = sect->named.decl;
546 error ("%+D causes a section type conflict", decl);
552 /* Return true if the current compilation mode benefits from having
553 objects grouped into blocks. */
556 use_object_blocks_p (void)
558 return flag_section_anchors;
561 /* Return the object_block structure for section SECT. Create a new
562 structure if we haven't created one already. Return null if SECT
565 static struct object_block *
566 get_block_for_section (section *sect)
568 struct object_block *block;
574 slot = htab_find_slot_with_hash (object_block_htab, sect,
575 hash_section (sect), INSERT);
576 block = (struct object_block *) *slot;
579 block = (struct object_block *)
580 ggc_alloc_cleared (sizeof (struct object_block));
587 /* Create a symbol with label LABEL and place it at byte offset
588 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
589 is not yet known. LABEL must be a garbage-collected string. */
592 create_block_symbol (const char *label, struct object_block *block,
593 HOST_WIDE_INT offset)
598 /* Create the extended SYMBOL_REF. */
599 size = RTX_HDR_SIZE + sizeof (struct block_symbol);
600 symbol = ggc_alloc_zone (size, &rtl_zone);
602 /* Initialize the normal SYMBOL_REF fields. */
603 memset (symbol, 0, size);
604 PUT_CODE (symbol, SYMBOL_REF);
605 PUT_MODE (symbol, Pmode);
606 XSTR (symbol, 0) = label;
607 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_HAS_BLOCK_INFO;
609 /* Initialize the block_symbol stuff. */
610 SYMBOL_REF_BLOCK (symbol) = block;
611 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
617 initialize_cold_section_name (void)
619 const char *stripped_name;
623 gcc_assert (cfun && current_function_decl);
624 if (cfun->unlikely_text_section_name)
627 dsn = DECL_SECTION_NAME (current_function_decl);
628 if (flag_function_sections && dsn)
630 name = alloca (TREE_STRING_LENGTH (dsn) + 1);
631 memcpy (name, TREE_STRING_POINTER (dsn), TREE_STRING_LENGTH (dsn) + 1);
633 stripped_name = targetm.strip_name_encoding (name);
635 buffer = ACONCAT ((stripped_name, "_unlikely", NULL));
636 cfun->unlikely_text_section_name = ggc_strdup (buffer);
639 cfun->unlikely_text_section_name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
642 /* Tell assembler to switch to unlikely-to-be-executed text section. */
645 unlikely_text_section (void)
649 if (!cfun->unlikely_text_section_name)
650 initialize_cold_section_name ();
652 return get_named_section (NULL, cfun->unlikely_text_section_name, 0);
655 return get_named_section (NULL, UNLIKELY_EXECUTED_TEXT_SECTION_NAME, 0);
658 /* When called within a function context, return true if the function
659 has been assigned a cold text section and if SECT is that section.
660 When called outside a function context, return true if SECT is the
661 default cold section. */
664 unlikely_text_section_p (section *sect)
669 name = cfun->unlikely_text_section_name;
671 name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
675 && SECTION_STYLE (sect) == SECTION_NAMED
676 && strcmp (name, sect->named.name) == 0);
679 /* Return a section with a particular name and with whatever SECTION_*
680 flags section_type_flags deems appropriate. The name of the section
681 is taken from NAME if nonnull, otherwise it is taken from DECL's
682 DECL_SECTION_NAME. DECL is the decl associated with the section
683 (see the section comment for details) and RELOC is as for
684 section_type_flags. */
687 get_named_section (tree decl, const char *name, int reloc)
691 gcc_assert (!decl || DECL_P (decl));
693 name = TREE_STRING_POINTER (DECL_SECTION_NAME (decl));
695 flags = targetm.section_type_flags (decl, name, reloc);
697 return get_section (name, flags, decl);
700 /* If required, set DECL_SECTION_NAME to a unique name. */
703 resolve_unique_section (tree decl, int reloc ATTRIBUTE_UNUSED,
704 int flag_function_or_data_sections)
706 if (DECL_SECTION_NAME (decl) == NULL_TREE
707 && targetm.have_named_sections
708 && (flag_function_or_data_sections
709 || DECL_ONE_ONLY (decl)))
710 targetm.asm_out.unique_section (decl, reloc);
713 #ifdef BSS_SECTION_ASM_OP
715 #ifdef ASM_OUTPUT_BSS
717 /* Utility function for ASM_OUTPUT_BSS for targets to use if
718 they don't support alignments in .bss.
719 ??? It is believed that this function will work in most cases so such
720 support is localized here. */
723 asm_output_bss (FILE *file, tree decl ATTRIBUTE_UNUSED,
725 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
726 unsigned HOST_WIDE_INT rounded)
728 gcc_assert (strcmp (XSTR (XEXP (DECL_RTL (decl), 0), 0), name) == 0);
729 targetm.asm_out.globalize_decl_name (file, decl);
730 switch_to_section (bss_section);
731 #ifdef ASM_DECLARE_OBJECT_NAME
732 last_assemble_variable_decl = decl;
733 ASM_DECLARE_OBJECT_NAME (file, name, decl);
735 /* Standard thing is just output label for the object. */
736 ASM_OUTPUT_LABEL (file, name);
737 #endif /* ASM_DECLARE_OBJECT_NAME */
738 ASM_OUTPUT_SKIP (file, rounded ? rounded : 1);
743 #ifdef ASM_OUTPUT_ALIGNED_BSS
745 /* Utility function for targets to use in implementing
746 ASM_OUTPUT_ALIGNED_BSS.
747 ??? It is believed that this function will work in most cases so such
748 support is localized here. */
751 asm_output_aligned_bss (FILE *file, tree decl ATTRIBUTE_UNUSED,
752 const char *name, unsigned HOST_WIDE_INT size,
755 switch_to_section (bss_section);
756 ASM_OUTPUT_ALIGN (file, floor_log2 (align / BITS_PER_UNIT));
757 #ifdef ASM_DECLARE_OBJECT_NAME
758 last_assemble_variable_decl = decl;
759 ASM_DECLARE_OBJECT_NAME (file, name, decl);
761 /* Standard thing is just output label for the object. */
762 ASM_OUTPUT_LABEL (file, name);
763 #endif /* ASM_DECLARE_OBJECT_NAME */
764 ASM_OUTPUT_SKIP (file, size ? size : 1);
769 #endif /* BSS_SECTION_ASM_OP */
771 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
772 /* Return the hot section for function DECL. Return text_section for
776 hot_function_section (tree decl)
778 if (decl != NULL_TREE
779 && DECL_SECTION_NAME (decl) != NULL_TREE
780 && targetm.have_named_sections)
781 return get_named_section (decl, NULL, 0);
787 /* Return the section for function DECL.
789 If DECL is NULL_TREE, return the text section. We can be passed
790 NULL_TREE under some circumstances by dbxout.c at least. */
793 function_section (tree decl)
797 if (first_function_block_is_cold)
800 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
801 if (decl != NULL_TREE
802 && DECL_SECTION_NAME (decl) != NULL_TREE)
803 return reloc ? unlikely_text_section ()
804 : get_named_section (decl, NULL, 0);
806 return targetm.asm_out.select_section (decl, reloc, DECL_ALIGN (decl));
808 return reloc ? unlikely_text_section () : hot_function_section (decl);
813 current_function_section (void)
815 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
816 if (current_function_decl != NULL_TREE
817 && DECL_SECTION_NAME (current_function_decl) != NULL_TREE)
818 return in_cold_section_p ? unlikely_text_section ()
819 : get_named_section (current_function_decl,
822 return targetm.asm_out.select_section (current_function_decl,
824 DECL_ALIGN (current_function_decl));
826 return (in_cold_section_p
827 ? unlikely_text_section ()
828 : hot_function_section (current_function_decl));
832 /* Return the read-only data section associated with function DECL. */
835 default_function_rodata_section (tree decl)
837 if (decl != NULL_TREE && DECL_SECTION_NAME (decl))
839 const char *name = TREE_STRING_POINTER (DECL_SECTION_NAME (decl));
841 if (DECL_ONE_ONLY (decl) && HAVE_COMDAT_GROUP)
843 size_t len = strlen (name) + 3;
844 char* rname = alloca (len);
846 strcpy (rname, ".rodata");
847 strcat (rname, name + 5);
848 return get_section (rname, SECTION_LINKONCE, decl);
850 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
851 else if (DECL_ONE_ONLY (decl)
852 && strncmp (name, ".gnu.linkonce.t.", 16) == 0)
854 size_t len = strlen (name) + 1;
855 char *rname = alloca (len);
857 memcpy (rname, name, len);
859 return get_section (rname, SECTION_LINKONCE, decl);
861 /* For .text.foo we want to use .rodata.foo. */
862 else if (flag_function_sections && flag_data_sections
863 && strncmp (name, ".text.", 6) == 0)
865 size_t len = strlen (name) + 1;
866 char *rname = alloca (len + 2);
868 memcpy (rname, ".rodata", 7);
869 memcpy (rname + 7, name + 5, len - 5);
870 return get_section (rname, 0, decl);
874 return readonly_data_section;
877 /* Return the read-only data section associated with function DECL
878 for targets where that section should be always the single
879 readonly data section. */
882 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED)
884 return readonly_data_section;
887 /* Return the section to use for string merging. */
890 mergeable_string_section (tree decl ATTRIBUTE_UNUSED,
891 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
892 unsigned int flags ATTRIBUTE_UNUSED)
896 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
897 && TREE_CODE (decl) == STRING_CST
898 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
900 && (len = int_size_in_bytes (TREE_TYPE (decl))) > 0
901 && TREE_STRING_LENGTH (decl) >= len)
903 enum machine_mode mode;
904 unsigned int modesize;
910 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (decl)));
911 modesize = GET_MODE_BITSIZE (mode);
912 if (modesize >= 8 && modesize <= 256
913 && (modesize & (modesize - 1)) == 0)
915 if (align < modesize)
918 str = TREE_STRING_POINTER (decl);
919 unit = GET_MODE_SIZE (mode);
921 /* Check for embedded NUL characters. */
922 for (i = 0; i < len; i += unit)
924 for (j = 0; j < unit; j++)
925 if (str[i + j] != '\0')
932 sprintf (name, ".rodata.str%d.%d", modesize / 8,
934 flags |= (modesize / 8) | SECTION_MERGE | SECTION_STRINGS;
935 return get_section (name, flags, NULL);
940 return readonly_data_section;
943 /* Return the section to use for constant merging. */
946 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED,
947 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
948 unsigned int flags ATTRIBUTE_UNUSED)
950 unsigned int modesize = GET_MODE_BITSIZE (mode);
952 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
958 && (align & (align - 1)) == 0)
962 sprintf (name, ".rodata.cst%d", (int) (align / 8));
963 flags |= (align / 8) | SECTION_MERGE;
964 return get_section (name, flags, NULL);
966 return readonly_data_section;
969 /* Given NAME, a putative register name, discard any customary prefixes. */
972 strip_reg_name (const char *name)
974 #ifdef REGISTER_PREFIX
975 if (!strncmp (name, REGISTER_PREFIX, strlen (REGISTER_PREFIX)))
976 name += strlen (REGISTER_PREFIX);
978 if (name[0] == '%' || name[0] == '#')
983 /* The user has asked for a DECL to have a particular name. Set (or
984 change) it in such a way that we don't prefix an underscore to
987 set_user_assembler_name (tree decl, const char *name)
989 char *starred = alloca (strlen (name) + 2);
991 strcpy (starred + 1, name);
992 change_decl_assembler_name (decl, get_identifier (starred));
993 SET_DECL_RTL (decl, NULL_RTX);
996 /* Decode an `asm' spec for a declaration as a register name.
997 Return the register number, or -1 if nothing specified,
998 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
999 or -3 if ASMSPEC is `cc' and is not recognized,
1000 or -4 if ASMSPEC is `memory' and is not recognized.
1001 Accept an exact spelling or a decimal number.
1002 Prefixes such as % are optional. */
1005 decode_reg_name (const char *asmspec)
1011 /* Get rid of confusing prefixes. */
1012 asmspec = strip_reg_name (asmspec);
1014 /* Allow a decimal number as a "register name". */
1015 for (i = strlen (asmspec) - 1; i >= 0; i--)
1016 if (! ISDIGIT (asmspec[i]))
1018 if (asmspec[0] != 0 && i < 0)
1021 if (i < FIRST_PSEUDO_REGISTER && i >= 0)
1027 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
1029 && ! strcmp (asmspec, strip_reg_name (reg_names[i])))
1032 #ifdef ADDITIONAL_REGISTER_NAMES
1034 static const struct { const char *const name; const int number; } table[]
1035 = ADDITIONAL_REGISTER_NAMES;
1037 for (i = 0; i < (int) ARRAY_SIZE (table); i++)
1038 if (table[i].name[0]
1039 && ! strcmp (asmspec, table[i].name))
1040 return table[i].number;
1042 #endif /* ADDITIONAL_REGISTER_NAMES */
1044 if (!strcmp (asmspec, "memory"))
1047 if (!strcmp (asmspec, "cc"))
1056 /* Return true if DECL's initializer is suitable for a BSS section. */
1059 bss_initializer_p (tree decl)
1061 return (DECL_INITIAL (decl) == NULL
1062 || DECL_INITIAL (decl) == error_mark_node
1063 || (flag_zero_initialized_in_bss
1064 /* Leave constant zeroes in .rodata so they
1066 && !TREE_READONLY (decl)
1067 && initializer_zerop (DECL_INITIAL (decl))));
1070 /* Compute the alignment of variable specified by DECL.
1071 DONT_OUTPUT_DATA is from assemble_variable. */
1074 align_variable (tree decl, bool dont_output_data)
1076 unsigned int align = DECL_ALIGN (decl);
1078 /* In the case for initialing an array whose length isn't specified,
1079 where we have not yet been able to do the layout,
1080 figure out the proper alignment now. */
1081 if (dont_output_data && DECL_SIZE (decl) == 0
1082 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
1083 align = MAX (align, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl))));
1085 /* Some object file formats have a maximum alignment which they support.
1086 In particular, a.out format supports a maximum alignment of 4. */
1087 if (align > MAX_OFILE_ALIGNMENT)
1089 warning (0, "alignment of %q+D is greater than maximum object "
1090 "file alignment. Using %d", decl,
1091 MAX_OFILE_ALIGNMENT/BITS_PER_UNIT);
1092 align = MAX_OFILE_ALIGNMENT;
1095 /* On some machines, it is good to increase alignment sometimes. */
1096 if (! DECL_USER_ALIGN (decl))
1098 #ifdef DATA_ALIGNMENT
1099 unsigned int data_align = DATA_ALIGNMENT (TREE_TYPE (decl), align);
1100 /* Don't increase alignment too much for TLS variables - TLS space
1102 if (! DECL_THREAD_LOCAL_P (decl) || data_align <= BITS_PER_WORD)
1105 #ifdef CONSTANT_ALIGNMENT
1106 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
1108 unsigned int const_align = CONSTANT_ALIGNMENT (DECL_INITIAL (decl),
1110 /* Don't increase alignment too much for TLS variables - TLS space
1112 if (! DECL_THREAD_LOCAL_P (decl) || const_align <= BITS_PER_WORD)
1113 align = const_align;
1118 /* Reset the alignment in case we have made it tighter, so we can benefit
1119 from it in get_pointer_alignment. */
1120 DECL_ALIGN (decl) = align;
1123 /* Return the section into which the given VAR_DECL or CONST_DECL
1124 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1125 section should be used wherever possible. */
1128 get_variable_section (tree decl, bool prefer_noswitch_p)
1132 /* If the decl has been given an explicit section name, then it
1133 isn't common, and shouldn't be handled as such. */
1134 if (DECL_COMMON (decl) && DECL_SECTION_NAME (decl) == NULL)
1136 if (DECL_THREAD_LOCAL_P (decl))
1137 return tls_comm_section;
1138 if (TREE_PUBLIC (decl) && bss_initializer_p (decl))
1139 return comm_section;
1142 if (DECL_INITIAL (decl) == error_mark_node)
1143 reloc = contains_pointers_p (TREE_TYPE (decl)) ? 3 : 0;
1144 else if (DECL_INITIAL (decl))
1145 reloc = compute_reloc_for_constant (DECL_INITIAL (decl));
1149 resolve_unique_section (decl, reloc, flag_data_sections);
1150 if (IN_NAMED_SECTION (decl))
1151 return get_named_section (decl, NULL, reloc);
1153 if (!DECL_THREAD_LOCAL_P (decl)
1154 && !(prefer_noswitch_p && targetm.have_switchable_bss_sections)
1155 && bss_initializer_p (decl))
1157 if (!TREE_PUBLIC (decl))
1158 return lcomm_section;
1159 if (bss_noswitch_section)
1160 return bss_noswitch_section;
1163 return targetm.asm_out.select_section (decl, reloc, DECL_ALIGN (decl));
1166 /* Return the block into which object_block DECL should be placed. */
1168 static struct object_block *
1169 get_block_for_decl (tree decl)
1173 if (TREE_CODE (decl) == VAR_DECL)
1175 /* The object must be defined in this translation unit. */
1176 if (DECL_EXTERNAL (decl))
1179 /* There's no point using object blocks for something that is
1180 isolated by definition. */
1181 if (DECL_ONE_ONLY (decl))
1185 /* We can only calculate block offsets if the decl has a known
1187 if (DECL_SIZE_UNIT (decl) == NULL)
1189 if (!host_integerp (DECL_SIZE_UNIT (decl), 1))
1192 /* Find out which section should contain DECL. We cannot put it into
1193 an object block if it requires a standalone definition. */
1194 if (TREE_CODE (decl) == VAR_DECL)
1195 align_variable (decl, 0);
1196 sect = get_variable_section (decl, true);
1197 if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
1200 return get_block_for_section (sect);
1203 /* Make sure block symbol SYMBOL is in block BLOCK. */
1206 change_symbol_block (rtx symbol, struct object_block *block)
1208 if (block != SYMBOL_REF_BLOCK (symbol))
1210 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol) < 0);
1211 SYMBOL_REF_BLOCK (symbol) = block;
1215 /* Return true if it is possible to put DECL in an object_block. */
1218 use_blocks_for_decl_p (tree decl)
1220 /* Only data DECLs can be placed into object blocks. */
1221 if (TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != CONST_DECL)
1224 /* Detect decls created by dw2_force_const_mem. Such decls are
1225 special because DECL_INITIAL doesn't specify the decl's true value.
1226 dw2_output_indirect_constants will instead call assemble_variable
1227 with dont_output_data set to 1 and then print the contents itself. */
1228 if (DECL_INITIAL (decl) == decl)
1231 /* If this decl is an alias, then we don't want to emit a definition. */
1232 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl)))
1238 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1239 have static storage duration. In other words, it should not be an
1240 automatic variable, including PARM_DECLs.
1242 There is, however, one exception: this function handles variables
1243 explicitly placed in a particular register by the user.
1245 This is never called for PARM_DECL nodes. */
1248 make_decl_rtl (tree decl)
1250 const char *name = 0;
1254 /* Check that we are not being given an automatic variable. */
1255 gcc_assert (TREE_CODE (decl) != PARM_DECL
1256 && TREE_CODE (decl) != RESULT_DECL);
1258 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1259 gcc_assert (TREE_CODE (decl) != VAR_DECL
1260 || TREE_STATIC (decl)
1261 || TREE_PUBLIC (decl)
1262 || DECL_EXTERNAL (decl)
1263 || DECL_REGISTER (decl));
1265 /* And that we were not given a type or a label. */
1266 gcc_assert (TREE_CODE (decl) != TYPE_DECL
1267 && TREE_CODE (decl) != LABEL_DECL);
1269 /* For a duplicate declaration, we can be called twice on the
1270 same DECL node. Don't discard the RTL already made. */
1271 if (DECL_RTL_SET_P (decl))
1273 /* If the old RTL had the wrong mode, fix the mode. */
1274 x = DECL_RTL (decl);
1275 if (GET_MODE (x) != DECL_MODE (decl))
1276 SET_DECL_RTL (decl, adjust_address_nv (x, DECL_MODE (decl), 0));
1278 if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1281 /* ??? Another way to do this would be to maintain a hashed
1282 table of such critters. Instead of adding stuff to a DECL
1283 to give certain attributes to it, we could use an external
1284 hash map from DECL to set of attributes. */
1286 /* Let the target reassign the RTL if it wants.
1287 This is necessary, for example, when one machine specific
1288 decl attribute overrides another. */
1289 targetm.encode_section_info (decl, DECL_RTL (decl), false);
1291 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1292 on the new decl information. */
1294 && GET_CODE (XEXP (x, 0)) == SYMBOL_REF
1295 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x, 0)))
1296 change_symbol_block (XEXP (x, 0), get_block_for_decl (decl));
1298 /* Make this function static known to the mudflap runtime. */
1299 if (flag_mudflap && TREE_CODE (decl) == VAR_DECL)
1300 mudflap_enqueue_decl (decl);
1305 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
1307 if (name[0] != '*' && TREE_CODE (decl) != FUNCTION_DECL
1308 && DECL_REGISTER (decl))
1310 error ("register name not specified for %q+D", decl);
1312 else if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1314 const char *asmspec = name+1;
1315 reg_number = decode_reg_name (asmspec);
1316 /* First detect errors in declaring global registers. */
1317 if (reg_number == -1)
1318 error ("register name not specified for %q+D", decl);
1319 else if (reg_number < 0)
1320 error ("invalid register name for %q+D", decl);
1321 else if (TYPE_MODE (TREE_TYPE (decl)) == BLKmode)
1322 error ("data type of %q+D isn%'t suitable for a register",
1324 else if (! HARD_REGNO_MODE_OK (reg_number, TYPE_MODE (TREE_TYPE (decl))))
1325 error ("register specified for %q+D isn%'t suitable for data type",
1327 /* Now handle properly declared static register variables. */
1332 if (DECL_INITIAL (decl) != 0 && TREE_STATIC (decl))
1334 DECL_INITIAL (decl) = 0;
1335 error ("global register variable has initial value");
1337 if (TREE_THIS_VOLATILE (decl))
1338 warning (OPT_Wvolatile_register_var,
1339 "optimization may eliminate reads and/or "
1340 "writes to register variables");
1342 /* If the user specified one of the eliminables registers here,
1343 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1344 confused with that register and be eliminated. This usage is
1345 somewhat suspect... */
1347 SET_DECL_RTL (decl, gen_rtx_raw_REG (DECL_MODE (decl), reg_number));
1348 ORIGINAL_REGNO (DECL_RTL (decl)) = reg_number;
1349 REG_USERVAR_P (DECL_RTL (decl)) = 1;
1351 if (TREE_STATIC (decl))
1353 /* Make this register global, so not usable for anything
1355 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1356 name = IDENTIFIER_POINTER (DECL_NAME (decl));
1357 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file, decl, reg_number, name);
1359 nregs = hard_regno_nregs[reg_number][DECL_MODE (decl)];
1361 globalize_reg (reg_number + --nregs);
1364 /* As a register variable, it has no section. */
1368 /* Now handle ordinary static variables and functions (in memory).
1369 Also handle vars declared register invalidly. */
1370 else if (name[0] == '*')
1372 #ifdef REGISTER_PREFIX
1373 if (strlen (REGISTER_PREFIX) != 0)
1375 reg_number = decode_reg_name (name);
1376 if (reg_number >= 0 || reg_number == -3)
1377 error ("register name given for non-register variable %q+D", decl);
1382 /* Specifying a section attribute on a variable forces it into a
1383 non-.bss section, and thus it cannot be common. */
1384 if (TREE_CODE (decl) == VAR_DECL
1385 && DECL_SECTION_NAME (decl) != NULL_TREE
1386 && DECL_INITIAL (decl) == NULL_TREE
1387 && DECL_COMMON (decl))
1388 DECL_COMMON (decl) = 0;
1390 /* Variables can't be both common and weak. */
1391 if (TREE_CODE (decl) == VAR_DECL && DECL_WEAK (decl))
1392 DECL_COMMON (decl) = 0;
1394 if (use_object_blocks_p () && use_blocks_for_decl_p (decl))
1395 x = create_block_symbol (name, get_block_for_decl (decl), -1);
1397 x = gen_rtx_SYMBOL_REF (Pmode, name);
1398 SYMBOL_REF_WEAK (x) = DECL_WEAK (decl);
1399 SET_SYMBOL_REF_DECL (x, decl);
1401 x = gen_rtx_MEM (DECL_MODE (decl), x);
1402 if (TREE_CODE (decl) != FUNCTION_DECL)
1403 set_mem_attributes (x, decl, 1);
1404 SET_DECL_RTL (decl, x);
1406 /* Optionally set flags or add text to the name to record information
1407 such as that it is a function name.
1408 If the name is changed, the macro ASM_OUTPUT_LABELREF
1409 will have to know how to strip this information. */
1410 targetm.encode_section_info (decl, DECL_RTL (decl), true);
1412 /* Make this function static known to the mudflap runtime. */
1413 if (flag_mudflap && TREE_CODE (decl) == VAR_DECL)
1414 mudflap_enqueue_decl (decl);
1417 /* Output a string of literal assembler code
1418 for an `asm' keyword used between functions. */
1421 assemble_asm (tree string)
1425 if (TREE_CODE (string) == ADDR_EXPR)
1426 string = TREE_OPERAND (string, 0);
1428 fprintf (asm_out_file, "\t%s\n", TREE_STRING_POINTER (string));
1431 /* Record an element in the table of global destructors. SYMBOL is
1432 a SYMBOL_REF of the function to be called; PRIORITY is a number
1433 between 0 and MAX_INIT_PRIORITY. */
1436 default_stabs_asm_out_destructor (rtx symbol ATTRIBUTE_UNUSED,
1437 int priority ATTRIBUTE_UNUSED)
1439 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1440 /* Tell GNU LD that this is part of the static destructor set.
1441 This will work for any system that uses stabs, most usefully
1443 dbxout_begin_simple_stabs ("___DTOR_LIST__", 22 /* N_SETT */);
1444 dbxout_stab_value_label (XSTR (symbol, 0));
1446 sorry ("global destructors not supported on this target");
1450 /* Write the address of the entity given by SYMBOL to SEC. */
1452 assemble_addr_to_section (rtx symbol, section *sec)
1454 switch_to_section (sec);
1455 assemble_align (POINTER_SIZE);
1456 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1459 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1460 not) section for PRIORITY. */
1462 get_cdtor_priority_section (int priority, bool constructor_p)
1466 /* ??? This only works reliably with the GNU linker. */
1467 sprintf (buf, "%s.%.5u",
1468 constructor_p ? ".ctors" : ".dtors",
1469 /* Invert the numbering so the linker puts us in the proper
1470 order; constructors are run from right to left, and the
1471 linker sorts in increasing order. */
1472 MAX_INIT_PRIORITY - priority);
1473 return get_section (buf, SECTION_WRITE, NULL);
1477 default_named_section_asm_out_destructor (rtx symbol, int priority)
1481 if (priority != DEFAULT_INIT_PRIORITY)
1482 sec = get_cdtor_priority_section (priority,
1483 /*constructor_p=*/false);
1485 sec = get_section (".dtors", SECTION_WRITE, NULL);
1487 assemble_addr_to_section (symbol, sec);
1490 #ifdef DTORS_SECTION_ASM_OP
1492 default_dtor_section_asm_out_destructor (rtx symbol,
1493 int priority ATTRIBUTE_UNUSED)
1495 assemble_addr_to_section (symbol, dtors_section);
1499 /* Likewise for global constructors. */
1502 default_stabs_asm_out_constructor (rtx symbol ATTRIBUTE_UNUSED,
1503 int priority ATTRIBUTE_UNUSED)
1505 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1506 /* Tell GNU LD that this is part of the static destructor set.
1507 This will work for any system that uses stabs, most usefully
1509 dbxout_begin_simple_stabs ("___CTOR_LIST__", 22 /* N_SETT */);
1510 dbxout_stab_value_label (XSTR (symbol, 0));
1512 sorry ("global constructors not supported on this target");
1517 default_named_section_asm_out_constructor (rtx symbol, int priority)
1521 if (priority != DEFAULT_INIT_PRIORITY)
1522 sec = get_cdtor_priority_section (priority,
1523 /*constructor_p=*/true);
1525 sec = get_section (".ctors", SECTION_WRITE, NULL);
1527 assemble_addr_to_section (symbol, sec);
1530 #ifdef CTORS_SECTION_ASM_OP
1532 default_ctor_section_asm_out_constructor (rtx symbol,
1533 int priority ATTRIBUTE_UNUSED)
1535 assemble_addr_to_section (symbol, ctors_section);
1539 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1540 a nonzero value if the constant pool should be output before the
1541 start of the function, or a zero value if the pool should output
1542 after the end of the function. The default is to put it before the
1545 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1546 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1549 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1550 to be output to assembler.
1551 Set first_global_object_name and weak_global_object_name as appropriate. */
1554 notice_global_symbol (tree decl)
1556 const char **type = &first_global_object_name;
1558 if (first_global_object_name
1559 || !TREE_PUBLIC (decl)
1560 || DECL_EXTERNAL (decl)
1561 || !DECL_NAME (decl)
1562 || (TREE_CODE (decl) != FUNCTION_DECL
1563 && (TREE_CODE (decl) != VAR_DECL
1564 || (DECL_COMMON (decl)
1565 && (DECL_INITIAL (decl) == 0
1566 || DECL_INITIAL (decl) == error_mark_node))))
1567 || !MEM_P (DECL_RTL (decl)))
1570 /* We win when global object is found, but it is useful to know about weak
1571 symbol as well so we can produce nicer unique names. */
1572 if (DECL_WEAK (decl) || DECL_ONE_ONLY (decl) || flag_shlib)
1573 type = &weak_global_object_name;
1579 rtx decl_rtl = DECL_RTL (decl);
1581 p = targetm.strip_name_encoding (XSTR (XEXP (decl_rtl, 0), 0));
1582 name = ggc_strdup (p);
1588 /* Output assembler code for the constant pool of a function and associated
1589 with defining the name of the function. DECL describes the function.
1590 NAME is the function's name. For the constant pool, we use the current
1591 constant pool data. */
1594 assemble_start_function (tree decl, const char *fnname)
1597 char tmp_label[100];
1598 bool hot_label_written = false;
1600 cfun->unlikely_text_section_name = NULL;
1602 first_function_block_is_cold = false;
1603 if (flag_reorder_blocks_and_partition)
1605 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTB", const_labelno);
1606 cfun->hot_section_label = ggc_strdup (tmp_label);
1607 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDB", const_labelno);
1608 cfun->cold_section_label = ggc_strdup (tmp_label);
1609 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTE", const_labelno);
1610 cfun->hot_section_end_label = ggc_strdup (tmp_label);
1611 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDE", const_labelno);
1612 cfun->cold_section_end_label = ggc_strdup (tmp_label);
1617 cfun->hot_section_label = NULL;
1618 cfun->cold_section_label = NULL;
1619 cfun->hot_section_end_label = NULL;
1620 cfun->cold_section_end_label = NULL;
1623 /* The following code does not need preprocessing in the assembler. */
1627 if (CONSTANT_POOL_BEFORE_FUNCTION)
1628 output_constant_pool (fnname, decl);
1630 resolve_unique_section (decl, 0, flag_function_sections);
1632 /* Make sure the not and cold text (code) sections are properly
1633 aligned. This is necessary here in the case where the function
1634 has both hot and cold sections, because we don't want to re-set
1635 the alignment when the section switch happens mid-function. */
1637 if (flag_reorder_blocks_and_partition)
1639 switch_to_section (unlikely_text_section ());
1640 assemble_align (DECL_ALIGN (decl));
1641 ASM_OUTPUT_LABEL (asm_out_file, cfun->cold_section_label);
1643 /* When the function starts with a cold section, we need to explicitly
1644 align the hot section and write out the hot section label.
1645 But if the current function is a thunk, we do not have a CFG. */
1646 if (!current_function_is_thunk
1647 && BB_PARTITION (ENTRY_BLOCK_PTR->next_bb) == BB_COLD_PARTITION)
1649 switch_to_section (text_section);
1650 assemble_align (DECL_ALIGN (decl));
1651 ASM_OUTPUT_LABEL (asm_out_file, cfun->hot_section_label);
1652 hot_label_written = true;
1653 first_function_block_is_cold = true;
1656 else if (DECL_SECTION_NAME (decl))
1658 /* Calls to function_section rely on first_function_block_is_cold
1659 being accurate. The first block may be cold even if we aren't
1660 doing partitioning, if the entire function was decided by
1661 choose_function_section (predict.c) to be cold. */
1663 initialize_cold_section_name ();
1665 if (cfun->unlikely_text_section_name
1666 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)),
1667 cfun->unlikely_text_section_name) == 0)
1668 first_function_block_is_cold = true;
1671 in_cold_section_p = first_function_block_is_cold;
1673 /* Switch to the correct text section for the start of the function. */
1675 switch_to_section (function_section (decl));
1676 if (flag_reorder_blocks_and_partition
1677 && !hot_label_written)
1678 ASM_OUTPUT_LABEL (asm_out_file, cfun->hot_section_label);
1680 /* Tell assembler to move to target machine's alignment for functions. */
1681 align = floor_log2 (DECL_ALIGN (decl) / BITS_PER_UNIT);
1684 ASM_OUTPUT_ALIGN (asm_out_file, align);
1687 /* Handle a user-specified function alignment.
1688 Note that we still need to align to DECL_ALIGN, as above,
1689 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1690 if (! DECL_USER_ALIGN (decl)
1691 && align_functions_log > align
1692 && cfun->function_frequency != FUNCTION_FREQUENCY_UNLIKELY_EXECUTED)
1694 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1695 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file,
1696 align_functions_log, align_functions - 1);
1698 ASM_OUTPUT_ALIGN (asm_out_file, align_functions_log);
1702 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1703 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file, fnname);
1706 (*debug_hooks->begin_function) (decl);
1708 /* Make function name accessible from other files, if appropriate. */
1710 if (TREE_PUBLIC (decl))
1712 notice_global_symbol (decl);
1714 globalize_decl (decl);
1716 maybe_assemble_visibility (decl);
1719 if (DECL_PRESERVE_P (decl))
1720 targetm.asm_out.mark_decl_preserved (fnname);
1722 /* Do any machine/system dependent processing of the function name. */
1723 #ifdef ASM_DECLARE_FUNCTION_NAME
1724 ASM_DECLARE_FUNCTION_NAME (asm_out_file, fnname, current_function_decl);
1726 /* Standard thing is just output label for the function. */
1727 ASM_OUTPUT_LABEL (asm_out_file, fnname);
1728 #endif /* ASM_DECLARE_FUNCTION_NAME */
1731 /* Output assembler code associated with defining the size of the
1732 function. DECL describes the function. NAME is the function's name. */
1735 assemble_end_function (tree decl, const char *fnname ATTRIBUTE_UNUSED)
1737 #ifdef ASM_DECLARE_FUNCTION_SIZE
1738 /* We could have switched section in the middle of the function. */
1739 if (flag_reorder_blocks_and_partition)
1740 switch_to_section (function_section (decl));
1741 ASM_DECLARE_FUNCTION_SIZE (asm_out_file, fnname, decl);
1743 if (! CONSTANT_POOL_BEFORE_FUNCTION)
1745 output_constant_pool (fnname, decl);
1746 switch_to_section (function_section (decl)); /* need to switch back */
1748 /* Output labels for end of hot/cold text sections (to be used by
1750 if (flag_reorder_blocks_and_partition)
1752 section *save_text_section;
1754 save_text_section = in_section;
1755 switch_to_section (unlikely_text_section ());
1756 ASM_OUTPUT_LABEL (asm_out_file, cfun->cold_section_end_label);
1757 if (first_function_block_is_cold)
1758 switch_to_section (text_section);
1760 switch_to_section (function_section (decl));
1761 ASM_OUTPUT_LABEL (asm_out_file, cfun->hot_section_end_label);
1762 switch_to_section (save_text_section);
1766 /* Assemble code to leave SIZE bytes of zeros. */
1769 assemble_zeros (unsigned HOST_WIDE_INT size)
1771 /* Do no output if -fsyntax-only. */
1772 if (flag_syntax_only)
1775 #ifdef ASM_NO_SKIP_IN_TEXT
1776 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1777 so we must output 0s explicitly in the text section. */
1778 if (ASM_NO_SKIP_IN_TEXT && (in_section->common.flags & SECTION_CODE) != 0)
1780 unsigned HOST_WIDE_INT i;
1781 for (i = 0; i < size; i++)
1782 assemble_integer (const0_rtx, 1, BITS_PER_UNIT, 1);
1787 ASM_OUTPUT_SKIP (asm_out_file, size);
1790 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1793 assemble_align (int align)
1795 if (align > BITS_PER_UNIT)
1797 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
1801 /* Assemble a string constant with the specified C string as contents. */
1804 assemble_string (const char *p, int size)
1809 /* If the string is very long, split it up. */
1813 int thissize = size - pos;
1814 if (thissize > maximum)
1817 ASM_OUTPUT_ASCII (asm_out_file, p, thissize);
1825 /* A noswitch_section_callback for lcomm_section. */
1828 emit_local (tree decl ATTRIBUTE_UNUSED,
1829 const char *name ATTRIBUTE_UNUSED,
1830 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1831 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1833 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1834 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, decl, name,
1835 size, DECL_ALIGN (decl));
1837 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1838 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, DECL_ALIGN (decl));
1841 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
1846 /* A noswitch_section_callback for bss_noswitch_section. */
1848 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
1850 emit_bss (tree decl ATTRIBUTE_UNUSED,
1851 const char *name ATTRIBUTE_UNUSED,
1852 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1853 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1855 #if defined ASM_OUTPUT_ALIGNED_BSS
1856 ASM_OUTPUT_ALIGNED_BSS (asm_out_file, decl, name, size, DECL_ALIGN (decl));
1859 ASM_OUTPUT_BSS (asm_out_file, decl, name, size, rounded);
1865 /* A noswitch_section_callback for comm_section. */
1868 emit_common (tree decl ATTRIBUTE_UNUSED,
1869 const char *name ATTRIBUTE_UNUSED,
1870 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1871 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1873 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1874 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, decl, name,
1875 size, DECL_ALIGN (decl));
1877 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1878 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, name, size, DECL_ALIGN (decl));
1881 ASM_OUTPUT_COMMON (asm_out_file, name, size, rounded);
1886 /* A noswitch_section_callback for tls_comm_section. */
1889 emit_tls_common (tree decl ATTRIBUTE_UNUSED,
1890 const char *name ATTRIBUTE_UNUSED,
1891 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1892 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1894 #ifdef ASM_OUTPUT_TLS_COMMON
1895 ASM_OUTPUT_TLS_COMMON (asm_out_file, decl, name, size);
1898 sorry ("thread-local COMMON data not implemented");
1903 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1904 NAME is the name of DECL's SYMBOL_REF. */
1907 assemble_noswitch_variable (tree decl, const char *name, section *sect)
1909 unsigned HOST_WIDE_INT size, rounded;
1911 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
1914 /* Don't allocate zero bytes of common,
1915 since that means "undefined external" in the linker. */
1919 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1920 so that each uninitialized object starts on such a boundary. */
1921 rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1;
1922 rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
1923 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
1925 if (!sect->noswitch.callback (decl, name, size, rounded)
1926 && (unsigned HOST_WIDE_INT) DECL_ALIGN_UNIT (decl) > rounded)
1927 warning (0, "requested alignment for %q+D is greater than "
1928 "implemented alignment of %wu", decl, rounded);
1931 /* A subroutine of assemble_variable. Output the label and contents of
1932 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1933 is as for assemble_variable. */
1936 assemble_variable_contents (tree decl, const char *name,
1937 bool dont_output_data)
1939 /* Do any machine/system dependent processing of the object. */
1940 #ifdef ASM_DECLARE_OBJECT_NAME
1941 last_assemble_variable_decl = decl;
1942 ASM_DECLARE_OBJECT_NAME (asm_out_file, name, decl);
1944 /* Standard thing is just output label for the object. */
1945 ASM_OUTPUT_LABEL (asm_out_file, name);
1946 #endif /* ASM_DECLARE_OBJECT_NAME */
1948 if (!dont_output_data)
1950 if (DECL_INITIAL (decl)
1951 && DECL_INITIAL (decl) != error_mark_node
1952 && !initializer_zerop (DECL_INITIAL (decl)))
1953 /* Output the actual data. */
1954 output_constant (DECL_INITIAL (decl),
1955 tree_low_cst (DECL_SIZE_UNIT (decl), 1),
1958 /* Leave space for it. */
1959 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl), 1));
1963 /* Assemble everything that is needed for a variable or function declaration.
1964 Not used for automatic variables, and not used for function definitions.
1965 Should not be called for variables of incomplete structure type.
1967 TOP_LEVEL is nonzero if this variable has file scope.
1968 AT_END is nonzero if this is the special handling, at end of compilation,
1969 to define things that have had only tentative definitions.
1970 DONT_OUTPUT_DATA if nonzero means don't actually output the
1971 initial value (that will be done by the caller). */
1974 assemble_variable (tree decl, int top_level ATTRIBUTE_UNUSED,
1975 int at_end ATTRIBUTE_UNUSED, int dont_output_data)
1978 rtx decl_rtl, symbol;
1981 if (! targetm.have_tls
1982 && TREE_CODE (decl) == VAR_DECL
1983 && DECL_THREAD_LOCAL_P (decl))
1985 tree to = emutls_decl (decl);
1987 /* If this variable is defined locally, then we need to initialize the
1988 control structure with size and alignment information. We do this
1989 at the last moment because tentative definitions can take a locally
1990 defined but uninitialized variable and initialize it later, which
1991 would result in incorrect contents. */
1992 if (! DECL_EXTERNAL (to)
1993 && (! DECL_COMMON (to)
1994 || (DECL_INITIAL (decl)
1995 && DECL_INITIAL (decl) != error_mark_node)))
1997 VEC(constructor_elt,gc) *v = VEC_alloc (constructor_elt, gc, 4);
1998 constructor_elt *elt;
1999 tree type = TREE_TYPE (to);
2000 tree field = TYPE_FIELDS (type);
2002 elt = VEC_quick_push (constructor_elt, v, NULL);
2004 elt->value = fold_convert (TREE_TYPE (field), DECL_SIZE_UNIT (decl));
2006 elt = VEC_quick_push (constructor_elt, v, NULL);
2007 field = TREE_CHAIN (field);
2009 elt->value = build_int_cst (TREE_TYPE (field),
2010 DECL_ALIGN_UNIT (decl));
2012 elt = VEC_quick_push (constructor_elt, v, NULL);
2013 field = TREE_CHAIN (field);
2015 elt->value = null_pointer_node;
2017 elt = VEC_quick_push (constructor_elt, v, NULL);
2018 field = TREE_CHAIN (field);
2020 elt->value = get_emutls_init_templ_addr (decl);
2022 DECL_INITIAL (to) = build_constructor (type, v);
2024 /* Make sure the template is marked as needed early enough.
2025 Without this, if the variable is placed in a
2026 section-anchored block, the template will only be marked
2027 when it's too late. */
2028 record_references_in_initializer (to);
2034 last_assemble_variable_decl = 0;
2036 /* Normally no need to say anything here for external references,
2037 since assemble_external is called by the language-specific code
2038 when a declaration is first seen. */
2040 if (DECL_EXTERNAL (decl))
2043 /* Output no assembler code for a function declaration.
2044 Only definitions of functions output anything. */
2046 if (TREE_CODE (decl) == FUNCTION_DECL)
2049 /* Do nothing for global register variables. */
2050 if (DECL_RTL_SET_P (decl) && REG_P (DECL_RTL (decl)))
2052 TREE_ASM_WRITTEN (decl) = 1;
2056 /* If type was incomplete when the variable was declared,
2057 see if it is complete now. */
2059 if (DECL_SIZE (decl) == 0)
2060 layout_decl (decl, 0);
2062 /* Still incomplete => don't allocate it; treat the tentative defn
2063 (which is what it must have been) as an `extern' reference. */
2065 if (!dont_output_data && DECL_SIZE (decl) == 0)
2067 error ("storage size of %q+D isn%'t known", decl);
2068 TREE_ASM_WRITTEN (decl) = 1;
2072 /* The first declaration of a variable that comes through this function
2073 decides whether it is global (in C, has external linkage)
2074 or local (in C, has internal linkage). So do nothing more
2075 if this function has already run. */
2077 if (TREE_ASM_WRITTEN (decl))
2080 /* Make sure targetm.encode_section_info is invoked before we set
2082 decl_rtl = DECL_RTL (decl);
2084 TREE_ASM_WRITTEN (decl) = 1;
2086 /* Do no output if -fsyntax-only. */
2087 if (flag_syntax_only)
2092 if (! dont_output_data
2093 && ! host_integerp (DECL_SIZE_UNIT (decl), 1))
2095 error ("size of variable %q+D is too large", decl);
2099 gcc_assert (MEM_P (decl_rtl));
2100 gcc_assert (GET_CODE (XEXP (decl_rtl, 0)) == SYMBOL_REF);
2101 symbol = XEXP (decl_rtl, 0);
2102 name = XSTR (symbol, 0);
2103 if (TREE_PUBLIC (decl) && DECL_NAME (decl))
2104 notice_global_symbol (decl);
2106 /* Compute the alignment of this data. */
2108 align_variable (decl, dont_output_data);
2109 set_mem_align (decl_rtl, DECL_ALIGN (decl));
2111 if (TREE_PUBLIC (decl))
2112 maybe_assemble_visibility (decl);
2114 if (DECL_PRESERVE_P (decl))
2115 targetm.asm_out.mark_decl_preserved (name);
2117 /* First make the assembler name(s) global if appropriate. */
2118 sect = get_variable_section (decl, false);
2119 if (TREE_PUBLIC (decl)
2121 && (sect->common.flags & SECTION_COMMON) == 0)
2122 globalize_decl (decl);
2124 /* Output any data that we will need to use the address of. */
2125 if (DECL_INITIAL (decl) && DECL_INITIAL (decl) != error_mark_node)
2126 output_addressed_constants (DECL_INITIAL (decl));
2128 /* dbxout.c needs to know this. */
2129 if (sect && (sect->common.flags & SECTION_CODE) != 0)
2130 DECL_IN_TEXT_SECTION (decl) = 1;
2132 /* If the decl is part of an object_block, make sure that the decl
2133 has been positioned within its block, but do not write out its
2134 definition yet. output_object_blocks will do that later. */
2135 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
2137 gcc_assert (!dont_output_data);
2138 place_block_symbol (symbol);
2140 else if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
2141 assemble_noswitch_variable (decl, name, sect);
2144 switch_to_section (sect);
2145 if (DECL_ALIGN (decl) > BITS_PER_UNIT)
2146 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (DECL_ALIGN_UNIT (decl)));
2147 assemble_variable_contents (decl, name, dont_output_data);
2151 /* Return 1 if type TYPE contains any pointers. */
2154 contains_pointers_p (tree type)
2156 switch (TREE_CODE (type))
2159 case REFERENCE_TYPE:
2160 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2161 so I'll play safe and return 1. */
2167 case QUAL_UNION_TYPE:
2170 /* For a type that has fields, see if the fields have pointers. */
2171 for (fields = TYPE_FIELDS (type); fields; fields = TREE_CHAIN (fields))
2172 if (TREE_CODE (fields) == FIELD_DECL
2173 && contains_pointers_p (TREE_TYPE (fields)))
2179 /* An array type contains pointers if its element type does. */
2180 return contains_pointers_p (TREE_TYPE (type));
2187 /* In unit-at-a-time mode, we delay assemble_external processing until
2188 the compilation unit is finalized. This is the best we can do for
2189 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2190 it all the way to final. See PR 17982 for further discussion. */
2191 static GTY(()) tree pending_assemble_externals;
2193 #ifdef ASM_OUTPUT_EXTERNAL
2194 /* True if DECL is a function decl for which no out-of-line copy exists.
2195 It is assumed that DECL's assembler name has been set. */
2198 incorporeal_function_p (tree decl)
2200 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
2204 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL
2205 && DECL_FUNCTION_CODE (decl) == BUILT_IN_ALLOCA)
2208 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
2209 if (strncmp (name, "__builtin_", strlen ("__builtin_")) == 0)
2215 /* Actually do the tests to determine if this is necessary, and invoke
2216 ASM_OUTPUT_EXTERNAL. */
2218 assemble_external_real (tree decl)
2220 rtx rtl = DECL_RTL (decl);
2222 if (MEM_P (rtl) && GET_CODE (XEXP (rtl, 0)) == SYMBOL_REF
2223 && !SYMBOL_REF_USED (XEXP (rtl, 0))
2224 && !incorporeal_function_p (decl))
2226 /* Some systems do require some output. */
2227 SYMBOL_REF_USED (XEXP (rtl, 0)) = 1;
2228 ASM_OUTPUT_EXTERNAL (asm_out_file, decl, XSTR (XEXP (rtl, 0), 0));
2234 process_pending_assemble_externals (void)
2236 #ifdef ASM_OUTPUT_EXTERNAL
2238 for (list = pending_assemble_externals; list; list = TREE_CHAIN (list))
2239 assemble_external_real (TREE_VALUE (list));
2241 pending_assemble_externals = 0;
2245 /* Output something to declare an external symbol to the assembler.
2246 (Most assemblers don't need this, so we normally output nothing.)
2247 Do nothing if DECL is not external. */
2250 assemble_external (tree decl ATTRIBUTE_UNUSED)
2252 /* Because most platforms do not define ASM_OUTPUT_EXTERNAL, the
2253 main body of this code is only rarely exercised. To provide some
2254 testing, on all platforms, we make sure that the ASM_OUT_FILE is
2255 open. If it's not, we should not be calling this function. */
2256 gcc_assert (asm_out_file);
2258 #ifdef ASM_OUTPUT_EXTERNAL
2259 if (!DECL_P (decl) || !DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl))
2262 /* We want to output external symbols at very last to check if they
2263 are references or not. */
2264 pending_assemble_externals = tree_cons (0, decl,
2265 pending_assemble_externals);
2269 /* Similar, for calling a library function FUN. */
2272 assemble_external_libcall (rtx fun)
2274 /* Declare library function name external when first used, if nec. */
2275 if (! SYMBOL_REF_USED (fun))
2277 SYMBOL_REF_USED (fun) = 1;
2278 targetm.asm_out.external_libcall (fun);
2282 /* Assemble a label named NAME. */
2285 assemble_label (const char *name)
2287 ASM_OUTPUT_LABEL (asm_out_file, name);
2290 /* Set the symbol_referenced flag for ID. */
2292 mark_referenced (tree id)
2294 TREE_SYMBOL_REFERENCED (id) = 1;
2297 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2299 mark_decl_referenced (tree decl)
2301 if (TREE_CODE (decl) == FUNCTION_DECL)
2303 /* Extern inline functions don't become needed when referenced.
2304 If we know a method will be emitted in other TU and no new
2305 functions can be marked reachable, just use the external
2307 struct cgraph_node *node = cgraph_node (decl);
2308 if (!DECL_EXTERNAL (decl)
2309 && (!node->local.vtable_method || !cgraph_global_info_ready
2310 || !node->local.finalized))
2311 cgraph_mark_needed_node (node);
2313 else if (TREE_CODE (decl) == VAR_DECL)
2315 struct varpool_node *node = varpool_node (decl);
2316 varpool_mark_needed_node (node);
2317 /* C++ frontend use mark_decl_references to force COMDAT variables
2318 to be output that might appear dead otherwise. */
2319 node->force_output = true;
2321 /* else do nothing - we can get various sorts of CST nodes here,
2322 which do not need to be marked. */
2326 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2327 until we find an identifier that is not itself a transparent alias.
2328 Modify the alias passed to it by reference (and all aliases on the
2329 way to the ultimate target), such that they do not have to be
2330 followed again, and return the ultimate target of the alias
2334 ultimate_transparent_alias_target (tree *alias)
2336 tree target = *alias;
2338 if (IDENTIFIER_TRANSPARENT_ALIAS (target))
2340 gcc_assert (TREE_CHAIN (target));
2341 target = ultimate_transparent_alias_target (&TREE_CHAIN (target));
2342 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target)
2343 && ! TREE_CHAIN (target));
2350 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2351 starts with a *, the rest of NAME is output verbatim. Otherwise
2352 NAME is transformed in a target-specific way (usually by the
2353 addition of an underscore). */
2356 assemble_name_raw (FILE *file, const char *name)
2359 fputs (&name[1], file);
2361 ASM_OUTPUT_LABELREF (file, name);
2364 /* Like assemble_name_raw, but should be used when NAME might refer to
2365 an entity that is also represented as a tree (like a function or
2366 variable). If NAME does refer to such an entity, that entity will
2367 be marked as referenced. */
2370 assemble_name (FILE *file, const char *name)
2372 const char *real_name;
2375 real_name = targetm.strip_name_encoding (name);
2377 id = maybe_get_identifier (real_name);
2382 mark_referenced (id);
2383 ultimate_transparent_alias_target (&id);
2385 name = IDENTIFIER_POINTER (id);
2386 gcc_assert (! TREE_CHAIN (id));
2389 assemble_name_raw (file, name);
2392 /* Allocate SIZE bytes writable static space with a gensym name
2393 and return an RTX to refer to its address. */
2396 assemble_static_space (unsigned HOST_WIDE_INT size)
2399 const char *namestring;
2402 ASM_GENERATE_INTERNAL_LABEL (name, "LF", const_labelno);
2404 namestring = ggc_strdup (name);
2406 x = gen_rtx_SYMBOL_REF (Pmode, namestring);
2407 SYMBOL_REF_FLAGS (x) = SYMBOL_FLAG_LOCAL;
2409 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2410 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, NULL_TREE, name, size,
2413 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2414 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, BIGGEST_ALIGNMENT);
2417 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2418 so that each uninitialized object starts on such a boundary. */
2419 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2420 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2421 = ((size + (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1)
2422 / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
2423 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
2424 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
2431 /* Assemble the static constant template for function entry trampolines.
2432 This is done at most once per compilation.
2433 Returns an RTX for the address of the template. */
2435 static GTY(()) rtx initial_trampoline;
2437 #ifdef TRAMPOLINE_TEMPLATE
2439 assemble_trampoline_template (void)
2446 if (initial_trampoline)
2447 return initial_trampoline;
2449 /* By default, put trampoline templates in read-only data section. */
2451 #ifdef TRAMPOLINE_SECTION
2452 switch_to_section (TRAMPOLINE_SECTION);
2454 switch_to_section (readonly_data_section);
2457 /* Write the assembler code to define one. */
2458 align = floor_log2 (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT);
2461 ASM_OUTPUT_ALIGN (asm_out_file, align);
2464 targetm.asm_out.internal_label (asm_out_file, "LTRAMP", 0);
2465 TRAMPOLINE_TEMPLATE (asm_out_file);
2467 /* Record the rtl to refer to it. */
2468 ASM_GENERATE_INTERNAL_LABEL (label, "LTRAMP", 0);
2469 name = ggc_strdup (label);
2470 symbol = gen_rtx_SYMBOL_REF (Pmode, name);
2471 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_LOCAL;
2473 initial_trampoline = gen_rtx_MEM (BLKmode, symbol);
2474 set_mem_align (initial_trampoline, TRAMPOLINE_ALIGNMENT);
2476 return initial_trampoline;
2480 /* A and B are either alignments or offsets. Return the minimum alignment
2481 that may be assumed after adding the two together. */
2483 static inline unsigned
2484 min_align (unsigned int a, unsigned int b)
2486 return (a | b) & -(a | b);
2489 /* Return the assembler directive for creating a given kind of integer
2490 object. SIZE is the number of bytes in the object and ALIGNED_P
2491 indicates whether it is known to be aligned. Return NULL if the
2492 assembly dialect has no such directive.
2494 The returned string should be printed at the start of a new line and
2495 be followed immediately by the object's initial value. */
2498 integer_asm_op (int size, int aligned_p)
2500 struct asm_int_op *ops;
2503 ops = &targetm.asm_out.aligned_op;
2505 ops = &targetm.asm_out.unaligned_op;
2510 return targetm.asm_out.byte_op;
2524 /* Use directive OP to assemble an integer object X. Print OP at the
2525 start of the line, followed immediately by the value of X. */
2528 assemble_integer_with_op (const char *op, rtx x)
2530 fputs (op, asm_out_file);
2531 output_addr_const (asm_out_file, x);
2532 fputc ('\n', asm_out_file);
2535 /* The default implementation of the asm_out.integer target hook. */
2538 default_assemble_integer (rtx x ATTRIBUTE_UNUSED,
2539 unsigned int size ATTRIBUTE_UNUSED,
2540 int aligned_p ATTRIBUTE_UNUSED)
2542 const char *op = integer_asm_op (size, aligned_p);
2543 /* Avoid GAS bugs for large values. Specifically negative values whose
2544 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2545 if (size > UNITS_PER_WORD && size > POINTER_SIZE / BITS_PER_UNIT)
2547 return op && (assemble_integer_with_op (op, x), true);
2550 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2551 the alignment of the integer in bits. Return 1 if we were able to output
2552 the constant, otherwise 0. We must be able to output the constant,
2553 if FORCE is nonzero. */
2556 assemble_integer (rtx x, unsigned int size, unsigned int align, int force)
2560 aligned_p = (align >= MIN (size * BITS_PER_UNIT, BIGGEST_ALIGNMENT));
2562 /* See if the target hook can handle this kind of object. */
2563 if (targetm.asm_out.integer (x, size, aligned_p))
2566 /* If the object is a multi-byte one, try splitting it up. Split
2567 it into words it if is multi-word, otherwise split it into bytes. */
2570 enum machine_mode omode, imode;
2571 unsigned int subalign;
2572 unsigned int subsize, i;
2574 subsize = size > UNITS_PER_WORD? UNITS_PER_WORD : 1;
2575 subalign = MIN (align, subsize * BITS_PER_UNIT);
2576 omode = mode_for_size (subsize * BITS_PER_UNIT, MODE_INT, 0);
2577 imode = mode_for_size (size * BITS_PER_UNIT, MODE_INT, 0);
2579 for (i = 0; i < size; i += subsize)
2581 rtx partial = simplify_subreg (omode, x, imode, i);
2582 if (!partial || !assemble_integer (partial, subsize, subalign, 0))
2588 /* If we've printed some of it, but not all of it, there's no going
2593 gcc_assert (!force);
2599 assemble_real (REAL_VALUE_TYPE d, enum machine_mode mode, unsigned int align)
2601 long data[4] = {0, 0, 0, 0};
2603 int bitsize, nelts, nunits, units_per;
2605 /* This is hairy. We have a quantity of known size. real_to_target
2606 will put it into an array of *host* longs, 32 bits per element
2607 (even if long is more than 32 bits). We need to determine the
2608 number of array elements that are occupied (nelts) and the number
2609 of *target* min-addressable units that will be occupied in the
2610 object file (nunits). We cannot assume that 32 divides the
2611 mode's bitsize (size * BITS_PER_UNIT) evenly.
2613 size * BITS_PER_UNIT is used here to make sure that padding bits
2614 (which might appear at either end of the value; real_to_target
2615 will include the padding bits in its output array) are included. */
2617 nunits = GET_MODE_SIZE (mode);
2618 bitsize = nunits * BITS_PER_UNIT;
2619 nelts = CEIL (bitsize, 32);
2620 units_per = 32 / BITS_PER_UNIT;
2622 real_to_target (data, &d, mode);
2624 /* Put out the first word with the specified alignment. */
2625 assemble_integer (GEN_INT (data[0]), MIN (nunits, units_per), align, 1);
2626 nunits -= units_per;
2628 /* Subsequent words need only 32-bit alignment. */
2629 align = min_align (align, 32);
2631 for (i = 1; i < nelts; i++)
2633 assemble_integer (GEN_INT (data[i]), MIN (nunits, units_per), align, 1);
2634 nunits -= units_per;
2638 /* Given an expression EXP with a constant value,
2639 reduce it to the sum of an assembler symbol and an integer.
2640 Store them both in the structure *VALUE.
2641 EXP must be reducible. */
2643 struct addr_const GTY(())
2646 HOST_WIDE_INT offset;
2650 decode_addr_const (tree exp, struct addr_const *value)
2652 tree target = TREE_OPERAND (exp, 0);
2658 if (TREE_CODE (target) == COMPONENT_REF
2659 && host_integerp (byte_position (TREE_OPERAND (target, 1)), 0))
2662 offset += int_byte_position (TREE_OPERAND (target, 1));
2663 target = TREE_OPERAND (target, 0);
2665 else if (TREE_CODE (target) == ARRAY_REF
2666 || TREE_CODE (target) == ARRAY_RANGE_REF)
2668 offset += (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target)), 1)
2669 * tree_low_cst (TREE_OPERAND (target, 1), 0));
2670 target = TREE_OPERAND (target, 0);
2676 switch (TREE_CODE (target))
2680 x = DECL_RTL (target);
2684 x = gen_rtx_MEM (FUNCTION_MODE,
2685 gen_rtx_LABEL_REF (Pmode, force_label_rtx (target)));
2693 x = output_constant_def (target, 1);
2700 gcc_assert (MEM_P (x));
2704 value->offset = offset;
2707 /* Uniquize all constants that appear in memory.
2708 Each constant in memory thus far output is recorded
2709 in `const_desc_table'. */
2711 struct constant_descriptor_tree GTY(())
2713 /* A MEM for the constant. */
2716 /* The value of the constant. */
2719 /* Hash of value. Computing the hash from value each time
2720 hashfn is called can't work properly, as that means recursive
2721 use of the hash table during hash table expansion. */
2725 static GTY((param_is (struct constant_descriptor_tree)))
2726 htab_t const_desc_htab;
2728 static struct constant_descriptor_tree * build_constant_desc (tree);
2729 static void maybe_output_constant_def_contents (struct constant_descriptor_tree *, int);
2731 /* Compute a hash code for a constant expression. */
2734 const_desc_hash (const void *ptr)
2736 return ((const struct constant_descriptor_tree *)ptr)->hash;
2740 const_hash_1 (const tree exp)
2745 enum tree_code code = TREE_CODE (exp);
2747 /* Either set P and LEN to the address and len of something to hash and
2748 exit the switch or return a value. */
2753 p = (char *) &TREE_INT_CST (exp);
2754 len = sizeof TREE_INT_CST (exp);
2758 return real_hash (TREE_REAL_CST_PTR (exp));
2761 p = TREE_STRING_POINTER (exp);
2762 len = TREE_STRING_LENGTH (exp);
2766 return (const_hash_1 (TREE_REALPART (exp)) * 5
2767 + const_hash_1 (TREE_IMAGPART (exp)));
2771 unsigned HOST_WIDE_INT idx;
2774 hi = 5 + int_size_in_bytes (TREE_TYPE (exp));
2776 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, value)
2778 hi = hi * 603 + const_hash_1 (value);
2786 struct addr_const value;
2788 decode_addr_const (exp, &value);
2789 switch (GET_CODE (value.base))
2792 /* Don't hash the address of the SYMBOL_REF;
2793 only use the offset and the symbol name. */
2795 p = XSTR (value.base, 0);
2796 for (i = 0; p[i] != 0; i++)
2797 hi = ((hi * 613) + (unsigned) (p[i]));
2801 hi = value.offset + CODE_LABEL_NUMBER (XEXP (value.base, 0)) * 13;
2811 case POINTER_PLUS_EXPR:
2813 return (const_hash_1 (TREE_OPERAND (exp, 0)) * 9
2814 + const_hash_1 (TREE_OPERAND (exp, 1)));
2818 case NON_LVALUE_EXPR:
2819 return const_hash_1 (TREE_OPERAND (exp, 0)) * 7 + 2;
2822 /* A language specific constant. Just hash the code. */
2826 /* Compute hashing function. */
2828 for (i = 0; i < len; i++)
2829 hi = ((hi * 613) + (unsigned) (p[i]));
2834 /* Wrapper of compare_constant, for the htab interface. */
2836 const_desc_eq (const void *p1, const void *p2)
2838 const struct constant_descriptor_tree *c1 = p1;
2839 const struct constant_descriptor_tree *c2 = p2;
2840 if (c1->hash != c2->hash)
2842 return compare_constant (c1->value, c2->value);
2845 /* Compare t1 and t2, and return 1 only if they are known to result in
2846 the same bit pattern on output. */
2849 compare_constant (const tree t1, const tree t2)
2851 enum tree_code typecode;
2853 if (t1 == NULL_TREE)
2854 return t2 == NULL_TREE;
2855 if (t2 == NULL_TREE)
2858 if (TREE_CODE (t1) != TREE_CODE (t2))
2861 switch (TREE_CODE (t1))
2864 /* Integer constants are the same only if the same width of type. */
2865 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2867 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2869 return tree_int_cst_equal (t1, t2);
2872 /* Real constants are the same only if the same width of type. */
2873 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2876 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2));
2879 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2882 return (TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
2883 && ! memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
2884 TREE_STRING_LENGTH (t1)));
2887 return (compare_constant (TREE_REALPART (t1), TREE_REALPART (t2))
2888 && compare_constant (TREE_IMAGPART (t1), TREE_IMAGPART (t2)));
2892 VEC(constructor_elt, gc) *v1, *v2;
2893 unsigned HOST_WIDE_INT idx;
2895 typecode = TREE_CODE (TREE_TYPE (t1));
2896 if (typecode != TREE_CODE (TREE_TYPE (t2)))
2899 if (typecode == ARRAY_TYPE)
2901 HOST_WIDE_INT size_1 = int_size_in_bytes (TREE_TYPE (t1));
2902 /* For arrays, check that the sizes all match. */
2903 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2))
2905 || size_1 != int_size_in_bytes (TREE_TYPE (t2)))
2910 /* For record and union constructors, require exact type
2912 if (TREE_TYPE (t1) != TREE_TYPE (t2))
2916 v1 = CONSTRUCTOR_ELTS (t1);
2917 v2 = CONSTRUCTOR_ELTS (t2);
2918 if (VEC_length (constructor_elt, v1)
2919 != VEC_length (constructor_elt, v2))
2922 for (idx = 0; idx < VEC_length (constructor_elt, v1); ++idx)
2924 constructor_elt *c1 = VEC_index (constructor_elt, v1, idx);
2925 constructor_elt *c2 = VEC_index (constructor_elt, v2, idx);
2927 /* Check that each value is the same... */
2928 if (!compare_constant (c1->value, c2->value))
2930 /* ... and that they apply to the same fields! */
2931 if (typecode == ARRAY_TYPE)
2933 if (!compare_constant (c1->index, c2->index))
2938 if (c1->index != c2->index)
2949 struct addr_const value1, value2;
2951 decode_addr_const (t1, &value1);
2952 decode_addr_const (t2, &value2);
2953 return (value1.offset == value2.offset
2954 && strcmp (XSTR (value1.base, 0), XSTR (value2.base, 0)) == 0);
2958 case POINTER_PLUS_EXPR:
2961 return (compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0))
2962 && compare_constant(TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1)));
2966 case NON_LVALUE_EXPR:
2967 case VIEW_CONVERT_EXPR:
2968 return compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
2973 nt1 = lang_hooks.expand_constant (t1);
2974 nt2 = lang_hooks.expand_constant (t2);
2975 if (nt1 != t1 || nt2 != t2)
2976 return compare_constant (nt1, nt2);
2985 /* Make a copy of the whole tree structure for a constant. This
2986 handles the same types of nodes that compare_constant handles. */
2989 copy_constant (tree exp)
2991 switch (TREE_CODE (exp))
2994 /* For ADDR_EXPR, we do not want to copy the decl whose address
2995 is requested. We do want to copy constants though. */
2996 if (CONSTANT_CLASS_P (TREE_OPERAND (exp, 0)))
2997 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
2998 copy_constant (TREE_OPERAND (exp, 0)));
3000 return copy_node (exp);
3005 return copy_node (exp);
3008 return build_complex (TREE_TYPE (exp),
3009 copy_constant (TREE_REALPART (exp)),
3010 copy_constant (TREE_IMAGPART (exp)));
3013 case POINTER_PLUS_EXPR:
3015 return build2 (TREE_CODE (exp), TREE_TYPE (exp),
3016 copy_constant (TREE_OPERAND (exp, 0)),
3017 copy_constant (TREE_OPERAND (exp, 1)));
3021 case NON_LVALUE_EXPR:
3022 case VIEW_CONVERT_EXPR:
3023 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
3024 copy_constant (TREE_OPERAND (exp, 0)));
3028 tree copy = copy_node (exp);
3029 VEC(constructor_elt, gc) *v;
3030 unsigned HOST_WIDE_INT idx;
3031 tree purpose, value;
3033 v = VEC_alloc(constructor_elt, gc, VEC_length(constructor_elt,
3034 CONSTRUCTOR_ELTS (exp)));
3035 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp), idx, purpose, value)
3037 constructor_elt *ce = VEC_quick_push (constructor_elt, v, NULL);
3038 ce->index = purpose;
3039 ce->value = copy_constant (value);
3041 CONSTRUCTOR_ELTS (copy) = v;
3047 tree t = lang_hooks.expand_constant (exp);
3049 gcc_assert (t != exp);
3050 return copy_constant (t);
3055 /* Return the alignment of constant EXP in bits. */
3058 get_constant_alignment (tree exp)
3062 align = TYPE_ALIGN (TREE_TYPE (exp));
3063 #ifdef CONSTANT_ALIGNMENT
3064 align = CONSTANT_ALIGNMENT (exp, align);
3069 /* Return the section into which constant EXP should be placed. */
3072 get_constant_section (tree exp)
3074 if (IN_NAMED_SECTION (exp))
3075 return get_named_section (exp, NULL, compute_reloc_for_constant (exp));
3077 return targetm.asm_out.select_section (exp,
3078 compute_reloc_for_constant (exp),
3079 get_constant_alignment (exp));
3082 /* Return the size of constant EXP in bytes. */
3084 static HOST_WIDE_INT
3085 get_constant_size (tree exp)
3089 size = int_size_in_bytes (TREE_TYPE (exp));
3090 if (TREE_CODE (exp) == STRING_CST)
3091 size = MAX (TREE_STRING_LENGTH (exp), size);
3095 /* Subroutine of output_constant_def:
3096 No constant equal to EXP is known to have been output.
3097 Make a constant descriptor to enter EXP in the hash table.
3098 Assign the label number and construct RTL to refer to the
3099 constant's location in memory.
3100 Caller is responsible for updating the hash table. */
3102 static struct constant_descriptor_tree *
3103 build_constant_desc (tree exp)
3109 struct constant_descriptor_tree *desc;
3111 desc = ggc_alloc (sizeof (*desc));
3112 desc->value = copy_constant (exp);
3114 /* Propagate marked-ness to copied constant. */
3115 if (flag_mudflap && mf_marked_p (exp))
3116 mf_mark (desc->value);
3118 /* Create a string containing the label name, in LABEL. */
3119 labelno = const_labelno++;
3120 ASM_GENERATE_INTERNAL_LABEL (label, "LC", labelno);
3122 /* We have a symbol name; construct the SYMBOL_REF and the MEM. */
3123 if (use_object_blocks_p ())
3125 section *sect = get_constant_section (exp);
3126 symbol = create_block_symbol (ggc_strdup (label),
3127 get_block_for_section (sect), -1);
3130 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3131 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3132 SET_SYMBOL_REF_DECL (symbol, desc->value);
3133 TREE_CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3135 rtl = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), symbol);
3136 set_mem_attributes (rtl, exp, 1);
3137 set_mem_alias_set (rtl, 0);
3138 set_mem_alias_set (rtl, const_alias_set);
3140 /* Set flags or add text to the name to record information, such as
3141 that it is a local symbol. If the name is changed, the macro
3142 ASM_OUTPUT_LABELREF will have to know how to strip this
3143 information. This call might invalidate our local variable
3144 SYMBOL; we can't use it afterward. */
3146 targetm.encode_section_info (exp, rtl, true);
3153 /* Return an rtx representing a reference to constant data in memory
3154 for the constant expression EXP.
3156 If assembler code for such a constant has already been output,
3157 return an rtx to refer to it.
3158 Otherwise, output such a constant in memory
3159 and generate an rtx for it.
3161 If DEFER is nonzero, this constant can be deferred and output only
3162 if referenced in the function after all optimizations.
3164 `const_desc_table' records which constants already have label strings. */
3167 output_constant_def (tree exp, int defer)
3169 struct constant_descriptor_tree *desc;
3170 struct constant_descriptor_tree key;
3173 /* Look up EXP in the table of constant descriptors. If we didn't find
3174 it, create a new one. */
3176 key.hash = const_hash_1 (exp);
3177 loc = htab_find_slot_with_hash (const_desc_htab, &key, key.hash, INSERT);
3182 desc = build_constant_desc (exp);
3183 desc->hash = key.hash;
3187 maybe_output_constant_def_contents (desc, defer);
3191 /* Subroutine of output_constant_def: Decide whether or not we need to
3192 output the constant DESC now, and if so, do it. */
3194 maybe_output_constant_def_contents (struct constant_descriptor_tree *desc,
3197 rtx symbol = XEXP (desc->rtl, 0);
3198 tree exp = desc->value;
3200 if (flag_syntax_only)
3203 if (TREE_ASM_WRITTEN (exp))
3204 /* Already output; don't do it again. */
3207 /* We can always defer constants as long as the context allows
3211 /* Increment n_deferred_constants if it exists. It needs to be at
3212 least as large as the number of constants actually referred to
3213 by the function. If it's too small we'll stop looking too early
3214 and fail to emit constants; if it's too large we'll only look
3215 through the entire function when we could have stopped earlier. */
3217 n_deferred_constants++;
3221 output_constant_def_contents (symbol);
3224 /* Subroutine of output_constant_def_contents. Output the definition
3225 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3226 constant's alignment in bits. */
3229 assemble_constant_contents (tree exp, const char *label, unsigned int align)
3233 size = get_constant_size (exp);
3235 /* Do any machine/system dependent processing of the constant. */
3236 #ifdef ASM_DECLARE_CONSTANT_NAME
3237 ASM_DECLARE_CONSTANT_NAME (asm_out_file, label, exp, size);
3239 /* Standard thing is just output label for the constant. */
3240 ASM_OUTPUT_LABEL (asm_out_file, label);
3241 #endif /* ASM_DECLARE_CONSTANT_NAME */
3243 /* Output the value of EXP. */
3244 output_constant (exp, size, align);
3247 /* We must output the constant data referred to by SYMBOL; do so. */
3250 output_constant_def_contents (rtx symbol)
3252 tree exp = SYMBOL_REF_DECL (symbol);
3255 /* Make sure any other constants whose addresses appear in EXP
3256 are assigned label numbers. */
3257 output_addressed_constants (exp);
3259 /* We are no longer deferring this constant. */
3260 TREE_ASM_WRITTEN (exp) = 1;
3262 /* If the constant is part of an object block, make sure that the
3263 decl has been positioned within its block, but do not write out
3264 its definition yet. output_object_blocks will do that later. */
3265 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
3266 place_block_symbol (symbol);
3269 switch_to_section (get_constant_section (exp));
3270 align = get_constant_alignment (exp);
3271 if (align > BITS_PER_UNIT)
3272 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
3273 assemble_constant_contents (exp, XSTR (symbol, 0), align);
3276 mudflap_enqueue_constant (exp);
3279 /* Look up EXP in the table of constant descriptors. Return the rtl
3280 if it has been emitted, else null. */
3283 lookup_constant_def (tree exp)
3285 struct constant_descriptor_tree *desc;
3286 struct constant_descriptor_tree key;
3289 key.hash = const_hash_1 (exp);
3290 desc = htab_find_with_hash (const_desc_htab, &key, key.hash);
3292 return (desc ? desc->rtl : NULL_RTX);
3295 /* Used in the hash tables to avoid outputting the same constant
3296 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3297 are output once per function, not once per file. */
3298 /* ??? Only a few targets need per-function constant pools. Most
3299 can use one per-file pool. Should add a targetm bit to tell the
3302 struct rtx_constant_pool GTY(())
3304 /* Pointers to first and last constant in pool, as ordered by offset. */
3305 struct constant_descriptor_rtx *first;
3306 struct constant_descriptor_rtx *last;
3308 /* Hash facility for making memory-constants from constant rtl-expressions.
3309 It is used on RISC machines where immediate integer arguments and
3310 constant addresses are restricted so that such constants must be stored
3312 htab_t GTY((param_is (struct constant_descriptor_rtx))) const_rtx_htab;
3314 /* Current offset in constant pool (does not include any
3315 machine-specific header). */
3316 HOST_WIDE_INT offset;
3319 struct constant_descriptor_rtx GTY((chain_next ("%h.next")))
3321 struct constant_descriptor_rtx *next;
3325 HOST_WIDE_INT offset;
3327 enum machine_mode mode;
3333 /* Hash and compare functions for const_rtx_htab. */
3336 const_desc_rtx_hash (const void *ptr)
3338 const struct constant_descriptor_rtx *desc = ptr;
3343 const_desc_rtx_eq (const void *a, const void *b)
3345 const struct constant_descriptor_rtx *x = a;
3346 const struct constant_descriptor_rtx *y = b;
3348 if (x->mode != y->mode)
3350 return rtx_equal_p (x->constant, y->constant);
3353 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3356 const_rtx_hash_1 (rtx *xp, void *data)
3358 unsigned HOST_WIDE_INT hwi;
3359 enum machine_mode mode;
3365 code = GET_CODE (x);
3366 mode = GET_MODE (x);
3367 h = (hashval_t) code * 1048573 + mode;
3375 const int shift = sizeof (hashval_t) * CHAR_BIT;
3376 const int n = sizeof (HOST_WIDE_INT) / sizeof (hashval_t);
3379 h ^= (hashval_t) hwi;
3380 for (i = 1; i < n; ++i)
3383 h ^= (hashval_t) hwi;
3389 if (mode == VOIDmode)
3391 hwi = CONST_DOUBLE_LOW (x) ^ CONST_DOUBLE_HIGH (x);
3395 h ^= real_hash (CONST_DOUBLE_REAL_VALUE (x));
3401 for (i = XVECLEN (x, 0); i-- > 0; )
3402 h = h * 251 + const_rtx_hash_1 (&XVECEXP (x, 0, i), data);
3407 h ^= htab_hash_string (XSTR (x, 0));
3411 h = h * 251 + CODE_LABEL_NUMBER (XEXP (x, 0));
3415 case UNSPEC_VOLATILE:
3416 h = h * 251 + XINT (x, 1);
3424 *hp = *hp * 509 + h;
3428 /* Compute a hash value for X, which should be a constant. */
3431 const_rtx_hash (rtx x)
3434 for_each_rtx (&x, const_rtx_hash_1, &h);
3439 /* Create and return a new rtx constant pool. */
3441 static struct rtx_constant_pool *
3442 create_constant_pool (void)
3444 struct rtx_constant_pool *pool;
3446 pool = ggc_alloc (sizeof (struct rtx_constant_pool));
3447 pool->const_rtx_htab = htab_create_ggc (31, const_desc_rtx_hash,
3448 const_desc_rtx_eq, NULL);
3455 /* Initialize constant pool hashing for a new function. */
3458 init_varasm_status (struct function *f)
3460 struct varasm_status *p;
3462 p = ggc_alloc (sizeof (struct varasm_status));
3465 p->pool = create_constant_pool ();
3466 p->deferred_constants = 0;
3469 /* Given a MINUS expression, simplify it if both sides
3470 include the same symbol. */
3473 simplify_subtraction (rtx x)
3475 rtx r = simplify_rtx (x);
3479 /* Given a constant rtx X, make (or find) a memory constant for its value
3480 and return a MEM rtx to refer to it in memory. */
3483 force_const_mem (enum machine_mode mode, rtx x)
3485 struct constant_descriptor_rtx *desc, tmp;
3486 struct rtx_constant_pool *pool;
3493 /* If we're not allowed to drop X into the constant pool, don't. */
3494 if (targetm.cannot_force_const_mem (x))
3497 /* Record that this function has used a constant pool entry. */
3498 current_function_uses_const_pool = 1;
3500 /* Decide which pool to use. */
3501 pool = (targetm.use_blocks_for_constant_p (mode, x)
3502 ? shared_constant_pool
3503 : cfun->varasm->pool);
3505 /* Lookup the value in the hashtable. */
3508 hash = const_rtx_hash (x);
3509 slot = htab_find_slot_with_hash (pool->const_rtx_htab, &tmp, hash, INSERT);
3512 /* If the constant was already present, return its memory. */
3514 return copy_rtx (desc->mem);
3516 /* Otherwise, create a new descriptor. */
3517 desc = ggc_alloc (sizeof (*desc));
3520 /* Align the location counter as required by EXP's data type. */
3521 align = GET_MODE_ALIGNMENT (mode == VOIDmode ? word_mode : mode);
3522 #ifdef CONSTANT_ALIGNMENT
3524 tree type = lang_hooks.types.type_for_mode (mode, 0);
3525 if (type != NULL_TREE)
3526 align = CONSTANT_ALIGNMENT (make_tree (type, x), align);
3530 pool->offset += (align / BITS_PER_UNIT) - 1;
3531 pool->offset &= ~ ((align / BITS_PER_UNIT) - 1);
3534 desc->constant = tmp.constant;
3535 desc->offset = pool->offset;
3538 desc->align = align;
3539 desc->labelno = const_labelno;
3542 pool->offset += GET_MODE_SIZE (mode);
3544 pool->last->next = desc;
3546 pool->first = pool->last = desc;
3549 /* Create a string containing the label name, in LABEL. */
3550 ASM_GENERATE_INTERNAL_LABEL (label, "LC", const_labelno);
3553 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3554 the constants pool. */
3555 if (use_object_blocks_p () && targetm.use_blocks_for_constant_p (mode, x))
3557 section *sect = targetm.asm_out.select_rtx_section (mode, x, align);
3558 symbol = create_block_symbol (ggc_strdup (label),
3559 get_block_for_section (sect), -1);
3562 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3564 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3565 CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3566 SET_SYMBOL_REF_CONSTANT (symbol, desc);
3568 /* Construct the MEM. */
3569 desc->mem = def = gen_const_mem (mode, symbol);
3570 set_mem_attributes (def, lang_hooks.types.type_for_mode (mode, 0), 1);
3571 set_mem_align (def, align);
3573 /* If we're dropping a label to the constant pool, make sure we
3575 if (GET_CODE (x) == LABEL_REF)
3576 LABEL_PRESERVE_P (XEXP (x, 0)) = 1;
3578 return copy_rtx (def);
3581 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3584 get_pool_constant (rtx addr)
3586 return SYMBOL_REF_CONSTANT (addr)->constant;
3589 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3590 and whether it has been output or not. */
3593 get_pool_constant_mark (rtx addr, bool *pmarked)
3595 struct constant_descriptor_rtx *desc;
3597 desc = SYMBOL_REF_CONSTANT (addr);
3598 *pmarked = (desc->mark != 0);
3599 return desc->constant;
3602 /* Similar, return the mode. */
3605 get_pool_mode (const_rtx addr)
3607 return SYMBOL_REF_CONSTANT (addr)->mode;
3610 /* Return the size of the constant pool. */
3613 get_pool_size (void)
3615 return cfun->varasm->pool->offset;
3618 /* Worker function for output_constant_pool_1. Emit assembly for X
3619 in MODE with known alignment ALIGN. */
3622 output_constant_pool_2 (enum machine_mode mode, rtx x, unsigned int align)
3624 switch (GET_MODE_CLASS (mode))
3627 case MODE_DECIMAL_FLOAT:
3631 gcc_assert (GET_CODE (x) == CONST_DOUBLE);
3632 REAL_VALUE_FROM_CONST_DOUBLE (r, x);
3633 assemble_real (r, mode, align);
3638 case MODE_PARTIAL_INT:
3639 assemble_integer (x, GET_MODE_SIZE (mode), align, 1);
3642 case MODE_VECTOR_FLOAT:
3643 case MODE_VECTOR_INT:
3646 enum machine_mode submode = GET_MODE_INNER (mode);
3647 unsigned int subalign = MIN (align, GET_MODE_BITSIZE (submode));
3649 gcc_assert (GET_CODE (x) == CONST_VECTOR);
3650 units = CONST_VECTOR_NUNITS (x);
3652 for (i = 0; i < units; i++)
3654 rtx elt = CONST_VECTOR_ELT (x, i);
3655 output_constant_pool_2 (submode, elt, i ? subalign : align);
3665 /* Worker function for output_constant_pool. Emit constant DESC,
3666 giving it ALIGN bits of alignment. */
3669 output_constant_pool_1 (struct constant_descriptor_rtx *desc,
3676 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3677 whose CODE_LABEL has been deleted. This can occur if a jump table
3678 is eliminated by optimization. If so, write a constant of zero
3679 instead. Note that this can also happen by turning the
3680 CODE_LABEL into a NOTE. */
3681 /* ??? This seems completely and utterly wrong. Certainly it's
3682 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3683 functioning even with INSN_DELETED_P and friends. */
3686 switch (GET_CODE (x))
3689 if (GET_CODE (XEXP (x, 0)) != PLUS
3690 || GET_CODE (XEXP (XEXP (x, 0), 0)) != LABEL_REF)
3692 tmp = XEXP (XEXP (x, 0), 0);
3697 gcc_assert (!INSN_DELETED_P (tmp));
3698 gcc_assert (!NOTE_P (tmp)
3699 || NOTE_KIND (tmp) != NOTE_INSN_DELETED);
3706 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3707 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file, x, desc->mode,
3708 align, desc->labelno, done);
3711 assemble_align (align);
3713 /* Output the label. */
3714 targetm.asm_out.internal_label (asm_out_file, "LC", desc->labelno);
3716 /* Output the data. */
3717 output_constant_pool_2 (desc->mode, x, align);
3719 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3720 sections have proper size. */
3721 if (align > GET_MODE_BITSIZE (desc->mode)
3723 && (in_section->common.flags & SECTION_MERGE))
3724 assemble_align (align);
3726 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3732 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3733 to as used. Emit referenced deferred strings. This function can
3734 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3737 mark_constant (rtx *current_rtx, void *data ATTRIBUTE_UNUSED)
3739 rtx x = *current_rtx;
3741 if (x == NULL_RTX || GET_CODE (x) != SYMBOL_REF)
3744 if (CONSTANT_POOL_ADDRESS_P (x))
3746 struct constant_descriptor_rtx *desc = SYMBOL_REF_CONSTANT (x);
3747 if (desc->mark == 0)
3750 for_each_rtx (&desc->constant, mark_constant, NULL);
3753 else if (TREE_CONSTANT_POOL_ADDRESS_P (x))
3755 tree exp = SYMBOL_REF_DECL (x);
3756 if (!TREE_ASM_WRITTEN (exp))
3758 n_deferred_constants--;
3759 output_constant_def_contents (x);
3766 /* Look through appropriate parts of INSN, marking all entries in the
3767 constant pool which are actually being used. Entries that are only
3768 referenced by other constants are also marked as used. Emit
3769 deferred strings that are used. */
3772 mark_constants (rtx insn)
3777 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3778 insns, not any notes that may be attached. We don't want to mark
3779 a constant just because it happens to appear in a REG_EQUIV note. */
3780 if (GET_CODE (PATTERN (insn)) == SEQUENCE)
3782 rtx seq = PATTERN (insn);
3783 int i, n = XVECLEN (seq, 0);
3784 for (i = 0; i < n; ++i)
3786 rtx subinsn = XVECEXP (seq, 0, i);
3787 if (INSN_P (subinsn))
3788 for_each_rtx (&PATTERN (subinsn), mark_constant, NULL);
3792 for_each_rtx (&PATTERN (insn), mark_constant, NULL);
3795 /* Look through the instructions for this function, and mark all the
3796 entries in POOL which are actually being used. Emit deferred constants
3797 which have indeed been used. */
3800 mark_constant_pool (void)
3804 if (!current_function_uses_const_pool && n_deferred_constants == 0)
3807 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
3808 mark_constants (insn);
3810 for (link = current_function_epilogue_delay_list;
3812 link = XEXP (link, 1))
3813 mark_constants (XEXP (link, 0));
3816 /* Write all the constants in POOL. */
3819 output_constant_pool_contents (struct rtx_constant_pool *pool)
3821 struct constant_descriptor_rtx *desc;
3823 for (desc = pool->first; desc ; desc = desc->next)
3826 /* If the constant is part of an object_block, make sure that
3827 the constant has been positioned within its block, but do not
3828 write out its definition yet. output_object_blocks will do
3830 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc->sym)
3831 && SYMBOL_REF_BLOCK (desc->sym))
3832 place_block_symbol (desc->sym);
3835 switch_to_section (targetm.asm_out.select_rtx_section
3836 (desc->mode, desc->constant, desc->align));
3837 output_constant_pool_1 (desc, desc->align);
3842 /* Mark all constants that are used in the current function, then write
3843 out the function's private constant pool. */
3846 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED,
3847 tree fndecl ATTRIBUTE_UNUSED)
3849 struct rtx_constant_pool *pool = cfun->varasm->pool;
3851 /* It is possible for gcc to call force_const_mem and then to later
3852 discard the instructions which refer to the constant. In such a
3853 case we do not need to output the constant. */
3854 mark_constant_pool ();
3856 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3857 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file, fnname, fndecl, pool->offset);
3860 output_constant_pool_contents (pool);
3862 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3863 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file, fnname, fndecl, pool->offset);
3867 /* Write the contents of the shared constant pool. */
3870 output_shared_constant_pool (void)
3872 output_constant_pool_contents (shared_constant_pool);
3875 /* Determine what kind of relocations EXP may need. */
3878 compute_reloc_for_constant (tree exp)
3880 int reloc = 0, reloc2;
3883 /* Give the front-end a chance to convert VALUE to something that
3884 looks more like a constant to the back-end. */
3885 exp = lang_hooks.expand_constant (exp);
3887 switch (TREE_CODE (exp))
3891 /* Go inside any operations that get_inner_reference can handle and see
3892 if what's inside is a constant: no need to do anything here for
3893 addresses of variables or functions. */
3894 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
3895 tem = TREE_OPERAND (tem, 0))
3898 if (TREE_PUBLIC (tem))
3905 case POINTER_PLUS_EXPR:
3906 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3907 reloc |= compute_reloc_for_constant (TREE_OPERAND (exp, 1));
3911 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3912 reloc2 = compute_reloc_for_constant (TREE_OPERAND (exp, 1));
3913 /* The difference of two local labels is computable at link time. */
3914 if (reloc == 1 && reloc2 == 1)
3922 case NON_LVALUE_EXPR:
3923 case VIEW_CONVERT_EXPR:
3924 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3929 unsigned HOST_WIDE_INT idx;
3930 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
3932 reloc |= compute_reloc_for_constant (tem);
3942 /* Find all the constants whose addresses are referenced inside of EXP,
3943 and make sure assembler code with a label has been output for each one.
3944 Indicate whether an ADDR_EXPR has been encountered. */
3947 output_addressed_constants (tree exp)
3951 /* Give the front-end a chance to convert VALUE to something that
3952 looks more like a constant to the back-end. */
3953 exp = lang_hooks.expand_constant (exp);
3955 switch (TREE_CODE (exp))
3959 /* Go inside any operations that get_inner_reference can handle and see
3960 if what's inside is a constant: no need to do anything here for
3961 addresses of variables or functions. */
3962 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
3963 tem = TREE_OPERAND (tem, 0))
3966 /* If we have an initialized CONST_DECL, retrieve the initializer. */
3967 if (TREE_CODE (tem) == CONST_DECL && DECL_INITIAL (tem))
3968 tem = DECL_INITIAL (tem);
3970 if (CONSTANT_CLASS_P (tem) || TREE_CODE (tem) == CONSTRUCTOR)
3971 output_constant_def (tem, 0);
3975 case POINTER_PLUS_EXPR:
3977 output_addressed_constants (TREE_OPERAND (exp, 1));
3982 case NON_LVALUE_EXPR:
3983 case VIEW_CONVERT_EXPR:
3984 output_addressed_constants (TREE_OPERAND (exp, 0));
3989 unsigned HOST_WIDE_INT idx;
3990 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
3992 output_addressed_constants (tem);
4001 /* Whether a constructor CTOR is a valid static constant initializer if all
4002 its elements are. This used to be internal to initializer_constant_valid_p
4003 and has been exposed to let other functions like categorize_ctor_elements
4004 evaluate the property while walking a constructor for other purposes. */
4007 constructor_static_from_elts_p (const_tree ctor)
4009 return (TREE_CONSTANT (ctor)
4010 && (TREE_CODE (TREE_TYPE (ctor)) == UNION_TYPE
4011 || TREE_CODE (TREE_TYPE (ctor)) == RECORD_TYPE)
4012 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (ctor)));
4015 /* Return nonzero if VALUE is a valid constant-valued expression
4016 for use in initializing a static variable; one that can be an
4017 element of a "constant" initializer.
4019 Return null_pointer_node if the value is absolute;
4020 if it is relocatable, return the variable that determines the relocation.
4021 We assume that VALUE has been folded as much as possible;
4022 therefore, we do not need to check for such things as
4023 arithmetic-combinations of integers. */
4026 initializer_constant_valid_p (tree value, tree endtype)
4028 /* Give the front-end a chance to convert VALUE to something that
4029 looks more like a constant to the back-end. */
4030 value = lang_hooks.expand_constant (value);
4032 switch (TREE_CODE (value))
4035 if (constructor_static_from_elts_p (value))
4037 unsigned HOST_WIDE_INT idx;
4039 bool absolute = true;
4041 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value), idx, elt)
4044 reloc = initializer_constant_valid_p (elt, TREE_TYPE (elt));
4047 if (reloc != null_pointer_node)
4050 /* For a non-absolute relocation, there is no single
4051 variable that can be "the variable that determines the
4053 return absolute ? null_pointer_node : error_mark_node;
4056 return TREE_STATIC (value) ? null_pointer_node : NULL_TREE;
4063 return null_pointer_node;
4067 value = staticp (TREE_OPERAND (value, 0));
4070 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out to
4071 be a constant, this is old-skool offsetof-like nonsense. */
4072 if (TREE_CODE (value) == INDIRECT_REF
4073 && TREE_CONSTANT (TREE_OPERAND (value, 0)))
4074 return null_pointer_node;
4075 /* Taking the address of a nested function involves a trampoline. */
4076 if (TREE_CODE (value) == FUNCTION_DECL
4077 && decl_function_context (value)
4078 && !DECL_NO_STATIC_CHAIN (value))
4080 /* "&{...}" requires a temporary to hold the constructed
4082 if (TREE_CODE (value) == CONSTRUCTOR)
4087 case VIEW_CONVERT_EXPR:
4088 case NON_LVALUE_EXPR:
4089 return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype);
4098 src = TREE_OPERAND (value, 0);
4099 src_type = TREE_TYPE (src);
4100 dest_type = TREE_TYPE (value);
4102 /* Allow conversions between pointer types, floating-point
4103 types, and offset types. */
4104 if ((POINTER_TYPE_P (dest_type) && POINTER_TYPE_P (src_type))
4105 || (FLOAT_TYPE_P (dest_type) && FLOAT_TYPE_P (src_type))
4106 || (TREE_CODE (dest_type) == OFFSET_TYPE
4107 && TREE_CODE (src_type) == OFFSET_TYPE))
4108 return initializer_constant_valid_p (src, endtype);
4110 /* Allow length-preserving conversions between integer types. */
4111 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type)
4112 && (TYPE_PRECISION (dest_type) == TYPE_PRECISION (src_type)))
4113 return initializer_constant_valid_p (src, endtype);
4115 /* Allow conversions between other integer types only if
4117 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type))
4119 tree inner = initializer_constant_valid_p (src, endtype);
4120 if (inner == null_pointer_node)
4121 return null_pointer_node;
4125 /* Allow (int) &foo provided int is as wide as a pointer. */
4126 if (INTEGRAL_TYPE_P (dest_type) && POINTER_TYPE_P (src_type)
4127 && (TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type)))
4128 return initializer_constant_valid_p (src, endtype);
4130 /* Likewise conversions from int to pointers, but also allow
4131 conversions from 0. */
4132 if ((POINTER_TYPE_P (dest_type)
4133 || TREE_CODE (dest_type) == OFFSET_TYPE)
4134 && INTEGRAL_TYPE_P (src_type))
4136 if (TREE_CODE (src) == INTEGER_CST
4137 && TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type))
4138 return null_pointer_node;
4139 if (integer_zerop (src))
4140 return null_pointer_node;
4141 else if (TYPE_PRECISION (dest_type) <= TYPE_PRECISION (src_type))
4142 return initializer_constant_valid_p (src, endtype);
4145 /* Allow conversions to struct or union types if the value
4147 if (TREE_CODE (dest_type) == RECORD_TYPE
4148 || TREE_CODE (dest_type) == UNION_TYPE)
4149 return initializer_constant_valid_p (src, endtype);
4153 case POINTER_PLUS_EXPR:
4155 if (! INTEGRAL_TYPE_P (endtype)
4156 || TYPE_PRECISION (endtype) >= POINTER_SIZE)
4158 tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
4160 tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
4162 /* If either term is absolute, use the other terms relocation. */
4163 if (valid0 == null_pointer_node)
4165 if (valid1 == null_pointer_node)
4171 if (! INTEGRAL_TYPE_P (endtype)
4172 || TYPE_PRECISION (endtype) >= POINTER_SIZE)
4174 tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
4176 tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
4178 /* Win if second argument is absolute. */
4179 if (valid1 == null_pointer_node)
4181 /* Win if both arguments have the same relocation.
4182 Then the value is absolute. */
4183 if (valid0 == valid1 && valid0 != 0)
4184 return null_pointer_node;
4186 /* Since GCC guarantees that string constants are unique in the
4187 generated code, a subtraction between two copies of the same
4188 constant string is absolute. */
4189 if (valid0 && TREE_CODE (valid0) == STRING_CST
4190 && valid1 && TREE_CODE (valid1) == STRING_CST
4191 && operand_equal_p (valid0, valid1, 1))
4192 return null_pointer_node;
4195 /* Support narrowing differences. */
4196 if (INTEGRAL_TYPE_P (endtype))
4200 op0 = TREE_OPERAND (value, 0);
4201 op1 = TREE_OPERAND (value, 1);
4203 /* Like STRIP_NOPS except allow the operand mode to widen.
4204 This works around a feature of fold that simplifies
4205 (int)(p1 - p2) to ((int)p1 - (int)p2) under the theory
4206 that the narrower operation is cheaper. */
4208 while (TREE_CODE (op0) == NOP_EXPR
4209 || TREE_CODE (op0) == CONVERT_EXPR
4210 || TREE_CODE (op0) == NON_LVALUE_EXPR)
4212 tree inner = TREE_OPERAND (op0, 0);
4213 if (inner == error_mark_node
4214 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
4215 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0)))
4216 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
4221 while (TREE_CODE (op1) == NOP_EXPR
4222 || TREE_CODE (op1) == CONVERT_EXPR
4223 || TREE_CODE (op1) == NON_LVALUE_EXPR)
4225 tree inner = TREE_OPERAND (op1, 0);
4226 if (inner == error_mark_node
4227 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
4228 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1)))
4229 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
4234 op0 = initializer_constant_valid_p (op0, endtype);
4235 op1 = initializer_constant_valid_p (op1, endtype);
4237 /* Both initializers must be known. */
4241 return null_pointer_node;
4243 /* Support differences between labels. */
4244 if (TREE_CODE (op0) == LABEL_DECL
4245 && TREE_CODE (op1) == LABEL_DECL)
4246 return null_pointer_node;
4248 if (TREE_CODE (op0) == STRING_CST
4249 && TREE_CODE (op1) == STRING_CST
4250 && operand_equal_p (op0, op1, 1))
4251 return null_pointer_node;
4263 /* Output assembler code for constant EXP to FILE, with no label.
4264 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4265 Assumes output_addressed_constants has been done on EXP already.
4267 Generate exactly SIZE bytes of assembler data, padding at the end
4268 with zeros if necessary. SIZE must always be specified.
4270 SIZE is important for structure constructors,
4271 since trailing members may have been omitted from the constructor.
4272 It is also important for initialization of arrays from string constants
4273 since the full length of the string constant might not be wanted.
4274 It is also needed for initialization of unions, where the initializer's
4275 type is just one member, and that may not be as long as the union.
4277 There a case in which we would fail to output exactly SIZE bytes:
4278 for a structure constructor that wants to produce more than SIZE bytes.
4279 But such constructors will never be generated for any possible input.
4281 ALIGN is the alignment of the data in bits. */
4284 output_constant (tree exp, unsigned HOST_WIDE_INT size, unsigned int align)
4286 enum tree_code code;
4287 unsigned HOST_WIDE_INT thissize;
4289 /* Some front-ends use constants other than the standard language-independent
4290 varieties, but which may still be output directly. Give the front-end a
4291 chance to convert EXP to a language-independent representation. */
4292 exp = lang_hooks.expand_constant (exp);
4294 if (size == 0 || flag_syntax_only)
4297 /* See if we're trying to initialize a pointer in a non-default mode
4298 to the address of some declaration somewhere. If the target says
4299 the mode is valid for pointers, assume the target has a way of
4301 if (TREE_CODE (exp) == NOP_EXPR
4302 && POINTER_TYPE_P (TREE_TYPE (exp))
4303 && targetm.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp))))
4305 tree saved_type = TREE_TYPE (exp);
4307 /* Peel off any intermediate conversions-to-pointer for valid
4309 while (TREE_CODE (exp) == NOP_EXPR
4310 && POINTER_TYPE_P (TREE_TYPE (exp))
4311 && targetm.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp))))
4312 exp = TREE_OPERAND (exp, 0);
4314 /* If what we're left with is the address of something, we can
4315 convert the address to the final type and output it that
4317 if (TREE_CODE (exp) == ADDR_EXPR)
4318 exp = build1 (ADDR_EXPR, saved_type, TREE_OPERAND (exp, 0));
4319 /* Likewise for constant ints. */
4320 else if (TREE_CODE (exp) == INTEGER_CST)
4321 exp = build_int_cst_wide (saved_type, TREE_INT_CST_LOW (exp),
4322 TREE_INT_CST_HIGH (exp));
4326 /* Eliminate any conversions since we'll be outputting the underlying
4328 while (TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR
4329 || TREE_CODE (exp) == NON_LVALUE_EXPR
4330 || TREE_CODE (exp) == VIEW_CONVERT_EXPR)
4332 HOST_WIDE_INT type_size = int_size_in_bytes (TREE_TYPE (exp));
4333 HOST_WIDE_INT op_size = int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp, 0)));
4335 /* Make sure eliminating the conversion is really a no-op, except with
4336 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4337 union types to allow for Ada unchecked unions. */
4338 if (type_size > op_size
4339 && TREE_CODE (exp) != VIEW_CONVERT_EXPR
4340 && TREE_CODE (TREE_TYPE (exp)) != UNION_TYPE)
4341 /* Keep the conversion. */
4344 exp = TREE_OPERAND (exp, 0);
4347 code = TREE_CODE (TREE_TYPE (exp));
4348 thissize = int_size_in_bytes (TREE_TYPE (exp));
4350 /* Give the front end another chance to expand constants. */
4351 exp = lang_hooks.expand_constant (exp);
4353 /* Allow a constructor with no elements for any data type.
4354 This means to fill the space with zeros. */
4355 if (TREE_CODE (exp) == CONSTRUCTOR
4356 && VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (exp)))
4358 assemble_zeros (size);
4362 if (TREE_CODE (exp) == FDESC_EXPR)
4364 #ifdef ASM_OUTPUT_FDESC
4365 HOST_WIDE_INT part = tree_low_cst (TREE_OPERAND (exp, 1), 0);
4366 tree decl = TREE_OPERAND (exp, 0);
4367 ASM_OUTPUT_FDESC (asm_out_file, decl, part);
4374 /* Now output the underlying data. If we've handling the padding, return.
4375 Otherwise, break and ensure SIZE is the size written. */
4382 case REFERENCE_TYPE:
4384 if (! assemble_integer (expand_expr (exp, NULL_RTX, VOIDmode,
4385 EXPAND_INITIALIZER),
4386 MIN (size, thissize), align, 0))
4387 error ("initializer for integer value is too complicated");
4391 if (TREE_CODE (exp) != REAL_CST)
4392 error ("initializer for floating value is not a floating constant");
4394 assemble_real (TREE_REAL_CST (exp), TYPE_MODE (TREE_TYPE (exp)), align);
4398 output_constant (TREE_REALPART (exp), thissize / 2, align);
4399 output_constant (TREE_IMAGPART (exp), thissize / 2,
4400 min_align (align, BITS_PER_UNIT * (thissize / 2)));
4405 switch (TREE_CODE (exp))
4408 output_constructor (exp, size, align);
4411 thissize = MIN ((unsigned HOST_WIDE_INT)TREE_STRING_LENGTH (exp),
4413 assemble_string (TREE_STRING_POINTER (exp), thissize);
4420 unsigned int nalign;
4421 enum machine_mode inner;
4423 inner = TYPE_MODE (TREE_TYPE (TREE_TYPE (exp)));
4424 nalign = MIN (align, GET_MODE_ALIGNMENT (inner));
4426 elt_size = GET_MODE_SIZE (inner);
4428 link = TREE_VECTOR_CST_ELTS (exp);
4429 output_constant (TREE_VALUE (link), elt_size, align);
4430 thissize = elt_size;
4431 while ((link = TREE_CHAIN (link)) != NULL)
4433 output_constant (TREE_VALUE (link), elt_size, nalign);
4434 thissize += elt_size;
4445 gcc_assert (TREE_CODE (exp) == CONSTRUCTOR);
4446 output_constructor (exp, size, align);
4456 if (size > thissize)
4457 assemble_zeros (size - thissize);
4461 /* Subroutine of output_constructor, used for computing the size of
4462 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4463 type with an unspecified upper bound. */
4465 static unsigned HOST_WIDE_INT
4466 array_size_for_constructor (tree val)
4469 unsigned HOST_WIDE_INT cnt;
4470 tree index, value, tmp;
4472 /* This code used to attempt to handle string constants that are not
4473 arrays of single-bytes, but nothing else does, so there's no point in
4475 if (TREE_CODE (val) == STRING_CST)
4476 return TREE_STRING_LENGTH (val);
4478 max_index = NULL_TREE;
4479 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val), cnt, index, value)
4481 if (TREE_CODE (index) == RANGE_EXPR)
4482 index = TREE_OPERAND (index, 1);
4483 if (max_index == NULL_TREE || tree_int_cst_lt (max_index, index))
4487 if (max_index == NULL_TREE)
4490 /* Compute the total number of array elements. */
4491 tmp = TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val)));
4492 i = size_binop (MINUS_EXPR, fold_convert (sizetype, max_index),
4493 fold_convert (sizetype, tmp));
4494 i = size_binop (PLUS_EXPR, i, build_int_cst (sizetype, 1));
4496 /* Multiply by the array element unit size to find number of bytes. */
4497 i = size_binop (MULT_EXPR, i, TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val))));
4499 return tree_low_cst (i, 1);
4502 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
4503 Generate at least SIZE bytes, padding if necessary. */
4506 output_constructor (tree exp, unsigned HOST_WIDE_INT size,
4509 tree type = TREE_TYPE (exp);
4512 /* Number of bytes output or skipped so far.
4513 In other words, current position within the constructor. */
4514 HOST_WIDE_INT total_bytes = 0;
4515 /* Nonzero means BYTE contains part of a byte, to be output. */
4516 int byte_buffer_in_use = 0;
4518 unsigned HOST_WIDE_INT cnt;
4519 constructor_elt *ce;
4521 gcc_assert (HOST_BITS_PER_WIDE_INT >= BITS_PER_UNIT);
4523 if (TREE_CODE (type) == RECORD_TYPE)
4524 field = TYPE_FIELDS (type);
4526 if (TREE_CODE (type) == ARRAY_TYPE
4527 && TYPE_DOMAIN (type) != 0)
4528 min_index = TYPE_MIN_VALUE (TYPE_DOMAIN (type));
4530 /* As LINK goes through the elements of the constant,
4531 FIELD goes through the structure fields, if the constant is a structure.
4532 if the constant is a union, then we override this,
4533 by getting the field from the TREE_LIST element.
4534 But the constant could also be an array. Then FIELD is zero.
4536 There is always a maximum of one element in the chain LINK for unions
4537 (even if the initializer in a source program incorrectly contains
4540 VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (exp), cnt, ce);
4541 cnt++, field = field ? TREE_CHAIN (field) : 0)
4543 tree val = ce->value;
4546 /* The element in a union constructor specifies the proper field
4548 if ((TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE
4549 || TREE_CODE (type) == QUAL_UNION_TYPE)
4553 else if (TREE_CODE (type) == ARRAY_TYPE)
4556 #ifdef ASM_COMMENT_START
4557 if (field && flag_verbose_asm)
4558 fprintf (asm_out_file, "%s %s:\n",
4561 ? IDENTIFIER_POINTER (DECL_NAME (field))
4565 /* Eliminate the marker that makes a cast not be an lvalue. */
4569 if (index && TREE_CODE (index) == RANGE_EXPR)
4571 unsigned HOST_WIDE_INT fieldsize
4572 = int_size_in_bytes (TREE_TYPE (type));
4573 HOST_WIDE_INT lo_index = tree_low_cst (TREE_OPERAND (index, 0), 0);
4574 HOST_WIDE_INT hi_index = tree_low_cst (TREE_OPERAND (index, 1), 0);
4575 HOST_WIDE_INT index;
4576 unsigned int align2 = min_align (align, fieldsize * BITS_PER_UNIT);
4578 for (index = lo_index; index <= hi_index; index++)
4580 /* Output the element's initial value. */
4582 assemble_zeros (fieldsize);
4584 output_constant (val, fieldsize, align2);
4586 /* Count its size. */
4587 total_bytes += fieldsize;
4590 else if (field == 0 || !DECL_BIT_FIELD (field))
4592 /* An element that is not a bit-field. */
4594 unsigned HOST_WIDE_INT fieldsize;
4595 /* Since this structure is static,
4596 we know the positions are constant. */
4597 HOST_WIDE_INT pos = field ? int_byte_position (field) : 0;
4598 unsigned int align2;
4601 pos = (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (val)), 1)
4602 * (tree_low_cst (index, 0) - tree_low_cst (min_index, 0)));
4604 /* Output any buffered-up bit-fields preceding this element. */
4605 if (byte_buffer_in_use)
4607 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4609 byte_buffer_in_use = 0;
4612 /* Advance to offset of this element.
4613 Note no alignment needed in an array, since that is guaranteed
4614 if each element has the proper size. */
4615 if ((field != 0 || index != 0) && pos != total_bytes)
4617 gcc_assert (pos >= total_bytes);
4618 assemble_zeros (pos - total_bytes);
4622 /* Find the alignment of this element. */
4623 align2 = min_align (align, BITS_PER_UNIT * pos);
4625 /* Determine size this element should occupy. */
4630 /* If this is an array with an unspecified upper bound,
4631 the initializer determines the size. */
4632 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4633 but we cannot do this until the deprecated support for
4634 initializing zero-length array members is removed. */
4635 if (TREE_CODE (TREE_TYPE (field)) == ARRAY_TYPE
4636 && TYPE_DOMAIN (TREE_TYPE (field))
4637 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (field))))
4639 fieldsize = array_size_for_constructor (val);
4640 /* Given a non-empty initialization, this field had
4642 gcc_assert (!fieldsize || !TREE_CHAIN (field));
4644 else if (DECL_SIZE_UNIT (field))
4646 /* ??? This can't be right. If the decl size overflows
4647 a host integer we will silently emit no data. */
4648 if (host_integerp (DECL_SIZE_UNIT (field), 1))
4649 fieldsize = tree_low_cst (DECL_SIZE_UNIT (field), 1);
4653 fieldsize = int_size_in_bytes (TREE_TYPE (type));
4655 /* Output the element's initial value. */
4657 assemble_zeros (fieldsize);
4659 output_constant (val, fieldsize, align2);
4661 /* Count its size. */
4662 total_bytes += fieldsize;
4664 else if (val != 0 && TREE_CODE (val) != INTEGER_CST)
4665 error ("invalid initial value for member %qs",
4666 IDENTIFIER_POINTER (DECL_NAME (field)));
4669 /* Element that is a bit-field. */
4671 HOST_WIDE_INT next_offset = int_bit_position (field);
4672 HOST_WIDE_INT end_offset
4673 = (next_offset + tree_low_cst (DECL_SIZE (field), 1));
4676 val = integer_zero_node;
4678 /* If this field does not start in this (or, next) byte,
4680 if (next_offset / BITS_PER_UNIT != total_bytes)
4682 /* Output remnant of any bit field in previous bytes. */
4683 if (byte_buffer_in_use)
4685 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4687 byte_buffer_in_use = 0;
4690 /* If still not at proper byte, advance to there. */
4691 if (next_offset / BITS_PER_UNIT != total_bytes)
4693 gcc_assert (next_offset / BITS_PER_UNIT >= total_bytes);
4694 assemble_zeros (next_offset / BITS_PER_UNIT - total_bytes);
4695 total_bytes = next_offset / BITS_PER_UNIT;
4699 if (! byte_buffer_in_use)
4702 /* We must split the element into pieces that fall within
4703 separate bytes, and combine each byte with previous or
4704 following bit-fields. */
4706 /* next_offset is the offset n fbits from the beginning of
4707 the structure to the next bit of this element to be processed.
4708 end_offset is the offset of the first bit past the end of
4710 while (next_offset < end_offset)
4714 HOST_WIDE_INT value;
4715 HOST_WIDE_INT next_byte = next_offset / BITS_PER_UNIT;
4716 HOST_WIDE_INT next_bit = next_offset % BITS_PER_UNIT;
4718 /* Advance from byte to byte
4719 within this element when necessary. */
4720 while (next_byte != total_bytes)
4722 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4727 /* Number of bits we can process at once
4728 (all part of the same byte). */
4729 this_time = MIN (end_offset - next_offset,
4730 BITS_PER_UNIT - next_bit);
4731 if (BYTES_BIG_ENDIAN)
4733 /* On big-endian machine, take the most significant bits
4734 first (of the bits that are significant)
4735 and put them into bytes from the most significant end. */
4736 shift = end_offset - next_offset - this_time;
4738 /* Don't try to take a bunch of bits that cross
4739 the word boundary in the INTEGER_CST. We can
4740 only select bits from the LOW or HIGH part
4742 if (shift < HOST_BITS_PER_WIDE_INT
4743 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4745 this_time = shift + this_time - HOST_BITS_PER_WIDE_INT;
4746 shift = HOST_BITS_PER_WIDE_INT;
4749 /* Now get the bits from the appropriate constant word. */
4750 if (shift < HOST_BITS_PER_WIDE_INT)
4751 value = TREE_INT_CST_LOW (val);
4754 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
4755 value = TREE_INT_CST_HIGH (val);
4756 shift -= HOST_BITS_PER_WIDE_INT;
4759 /* Get the result. This works only when:
4760 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4761 byte |= (((value >> shift)
4762 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
4763 << (BITS_PER_UNIT - this_time - next_bit));
4767 /* On little-endian machines,
4768 take first the least significant bits of the value
4769 and pack them starting at the least significant
4770 bits of the bytes. */
4771 shift = next_offset - int_bit_position (field);
4773 /* Don't try to take a bunch of bits that cross
4774 the word boundary in the INTEGER_CST. We can
4775 only select bits from the LOW or HIGH part
4777 if (shift < HOST_BITS_PER_WIDE_INT
4778 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4779 this_time = (HOST_BITS_PER_WIDE_INT - shift);
4781 /* Now get the bits from the appropriate constant word. */
4782 if (shift < HOST_BITS_PER_WIDE_INT)
4783 value = TREE_INT_CST_LOW (val);
4786 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
4787 value = TREE_INT_CST_HIGH (val);
4788 shift -= HOST_BITS_PER_WIDE_INT;
4791 /* Get the result. This works only when:
4792 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4793 byte |= (((value >> shift)
4794 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
4798 next_offset += this_time;
4799 byte_buffer_in_use = 1;
4804 if (byte_buffer_in_use)
4806 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4810 if ((unsigned HOST_WIDE_INT)total_bytes < size)
4811 assemble_zeros (size - total_bytes);
4814 /* This TREE_LIST contains any weak symbol declarations waiting
4816 static GTY(()) tree weak_decls;
4818 /* Mark DECL as weak. */
4821 mark_weak (tree decl)
4823 DECL_WEAK (decl) = 1;
4825 if (DECL_RTL_SET_P (decl)
4826 && MEM_P (DECL_RTL (decl))
4827 && XEXP (DECL_RTL (decl), 0)
4828 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == SYMBOL_REF)
4829 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl), 0)) = 1;
4832 /* Merge weak status between NEWDECL and OLDDECL. */
4835 merge_weak (tree newdecl, tree olddecl)
4837 if (DECL_WEAK (newdecl) == DECL_WEAK (olddecl))
4839 if (DECL_WEAK (newdecl) && SUPPORTS_WEAK)
4842 /* We put the NEWDECL on the weak_decls list at some point
4843 and OLDDECL as well. Keep just OLDDECL on the list. */
4844 for (pwd = &weak_decls; *pwd; pwd = &TREE_CHAIN (*pwd))
4845 if (TREE_VALUE (*pwd) == newdecl)
4847 *pwd = TREE_CHAIN (*pwd);
4854 if (DECL_WEAK (newdecl))
4858 /* NEWDECL is weak, but OLDDECL is not. */
4860 /* If we already output the OLDDECL, we're in trouble; we can't
4861 go back and make it weak. This error cannot caught in
4862 declare_weak because the NEWDECL and OLDDECL was not yet
4863 been merged; therefore, TREE_ASM_WRITTEN was not set. */
4864 if (TREE_ASM_WRITTEN (olddecl))
4865 error ("weak declaration of %q+D must precede definition",
4868 /* If we've already generated rtl referencing OLDDECL, we may
4869 have done so in a way that will not function properly with
4871 else if (TREE_USED (olddecl)
4872 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl)))
4873 warning (0, "weak declaration of %q+D after first use results "
4874 "in unspecified behavior", newdecl);
4878 /* We put the NEWDECL on the weak_decls list at some point.
4879 Replace it with the OLDDECL. */
4880 for (wd = weak_decls; wd; wd = TREE_CHAIN (wd))
4881 if (TREE_VALUE (wd) == newdecl)
4883 TREE_VALUE (wd) = olddecl;
4886 /* We may not find the entry on the list. If NEWDECL is a
4887 weak alias, then we will have already called
4888 globalize_decl to remove the entry; in that case, we do
4889 not need to do anything. */
4892 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
4893 mark_weak (olddecl);
4896 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
4897 weak. Just update NEWDECL to indicate that it's weak too. */
4898 mark_weak (newdecl);
4901 /* Declare DECL to be a weak symbol. */
4904 declare_weak (tree decl)
4906 if (! TREE_PUBLIC (decl))
4907 error ("weak declaration of %q+D must be public", decl);
4908 else if (TREE_CODE (decl) == FUNCTION_DECL && TREE_ASM_WRITTEN (decl))
4909 error ("weak declaration of %q+D must precede definition", decl);
4910 else if (SUPPORTS_WEAK)
4912 if (! DECL_WEAK (decl))
4913 weak_decls = tree_cons (NULL, decl, weak_decls);
4916 warning (0, "weak declaration of %q+D not supported", decl);
4922 weak_finish_1 (tree decl)
4924 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
4925 const char *const name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
4928 if (! TREE_USED (decl))
4931 #ifdef ASM_WEAKEN_DECL
4932 ASM_WEAKEN_DECL (asm_out_file, decl, name, NULL);
4934 #ifdef ASM_WEAKEN_LABEL
4935 ASM_WEAKEN_LABEL (asm_out_file, name);
4937 #ifdef ASM_OUTPUT_WEAK_ALIAS
4939 static bool warn_once = 0;
4942 warning (0, "only weak aliases are supported in this configuration");
4952 /* This TREE_LIST contains weakref targets. */
4954 static GTY(()) tree weakref_targets;
4956 /* Forward declaration. */
4957 static tree find_decl_and_mark_needed (tree decl, tree target);
4959 /* Emit any pending weak declarations. */
4966 for (t = weakref_targets; t; t = TREE_CHAIN (t))
4968 tree alias_decl = TREE_PURPOSE (t);
4969 tree target = ultimate_transparent_alias_target (&TREE_VALUE (t));
4971 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl)))
4972 /* Remove alias_decl from the weak list, but leave entries for
4973 the target alone. */
4975 #ifndef ASM_OUTPUT_WEAKREF
4976 else if (! TREE_SYMBOL_REFERENCED (target))
4978 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
4979 defined, otherwise we and weak_finish_1 would use a
4980 different macros. */
4981 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
4982 ASM_WEAKEN_LABEL (asm_out_file, IDENTIFIER_POINTER (target));
4984 tree decl = find_decl_and_mark_needed (alias_decl, target);
4988 decl = build_decl (TREE_CODE (alias_decl), target,
4989 TREE_TYPE (alias_decl));
4991 DECL_EXTERNAL (decl) = 1;
4992 TREE_PUBLIC (decl) = 1;
4993 DECL_ARTIFICIAL (decl) = 1;
4994 TREE_NOTHROW (decl) = TREE_NOTHROW (alias_decl);
4995 TREE_USED (decl) = 1;
4998 weak_finish_1 (decl);
5007 /* Remove the alias and the target from the pending weak list
5008 so that we do not emit any .weak directives for the former,
5009 nor multiple .weak directives for the latter. */
5010 for (p = &weak_decls; (t2 = *p) ; )
5012 if (TREE_VALUE (t2) == alias_decl
5013 || target == DECL_ASSEMBLER_NAME (TREE_VALUE (t2)))
5014 *p = TREE_CHAIN (t2);
5016 p = &TREE_CHAIN (t2);
5019 /* Remove other weakrefs to the same target, to speed things up. */
5020 for (p = &TREE_CHAIN (t); (t2 = *p) ; )
5022 if (target == ultimate_transparent_alias_target (&TREE_VALUE (t2)))
5023 *p = TREE_CHAIN (t2);
5025 p = &TREE_CHAIN (t2);
5030 for (t = weak_decls; t; t = TREE_CHAIN (t))
5032 tree decl = TREE_VALUE (t);
5034 weak_finish_1 (decl);
5038 /* Emit the assembly bits to indicate that DECL is globally visible. */
5041 globalize_decl (tree decl)
5044 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5045 if (DECL_WEAK (decl))
5047 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
5050 #ifdef ASM_WEAKEN_DECL
5051 ASM_WEAKEN_DECL (asm_out_file, decl, name, 0);
5053 ASM_WEAKEN_LABEL (asm_out_file, name);
5056 /* Remove this function from the pending weak list so that
5057 we do not emit multiple .weak directives for it. */
5058 for (p = &weak_decls; (t = *p) ; )
5060 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
5061 *p = TREE_CHAIN (t);
5063 p = &TREE_CHAIN (t);
5066 /* Remove weakrefs to the same target from the pending weakref
5067 list, for the same reason. */
5068 for (p = &weakref_targets; (t = *p) ; )
5070 if (DECL_ASSEMBLER_NAME (decl)
5071 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
5072 *p = TREE_CHAIN (t);
5074 p = &TREE_CHAIN (t);
5081 targetm.asm_out.globalize_decl_name (asm_out_file, decl);
5084 /* We have to be able to tell cgraph about the needed-ness of the target
5085 of an alias. This requires that the decl have been defined. Aliases
5086 that precede their definition have to be queued for later processing. */
5088 typedef struct alias_pair GTY(())
5094 /* Define gc'd vector type. */
5095 DEF_VEC_O(alias_pair);
5096 DEF_VEC_ALLOC_O(alias_pair,gc);
5098 static GTY(()) VEC(alias_pair,gc) *alias_pairs;
5100 /* Given an assembly name, find the decl it is associated with. At the
5101 same time, mark it needed for cgraph. */
5104 find_decl_and_mark_needed (tree decl, tree target)
5106 struct cgraph_node *fnode = NULL;
5107 struct varpool_node *vnode = NULL;
5109 if (TREE_CODE (decl) == FUNCTION_DECL)
5111 fnode = cgraph_node_for_asm (target);
5113 vnode = varpool_node_for_asm (target);
5117 vnode = varpool_node_for_asm (target);
5119 fnode = cgraph_node_for_asm (target);
5124 /* We can't mark function nodes as used after cgraph global info
5125 is finished. This wouldn't generally be necessary, but C++
5126 virtual table thunks are introduced late in the game and
5127 might seem like they need marking, although in fact they
5129 if (! cgraph_global_info_ready)
5130 cgraph_mark_needed_node (fnode);
5135 varpool_mark_needed_node (vnode);
5142 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5143 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5144 tree node is DECL to have the value of the tree node TARGET. */
5147 do_assemble_alias (tree decl, tree target)
5149 if (TREE_ASM_WRITTEN (decl))
5152 TREE_ASM_WRITTEN (decl) = 1;
5153 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl)) = 1;
5155 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
5157 ultimate_transparent_alias_target (&target);
5159 if (!targetm.have_tls
5160 && TREE_CODE (decl) == VAR_DECL
5161 && DECL_THREAD_LOCAL_P (decl))
5163 decl = emutls_decl (decl);
5164 target = get_emutls_object_name (target);
5167 if (!TREE_SYMBOL_REFERENCED (target))
5168 weakref_targets = tree_cons (decl, target, weakref_targets);
5170 #ifdef ASM_OUTPUT_WEAKREF
5171 ASM_OUTPUT_WEAKREF (asm_out_file, decl,
5172 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
5173 IDENTIFIER_POINTER (target));
5177 error ("%Jweakref is not supported in this configuration", decl);
5184 if (!targetm.have_tls
5185 && TREE_CODE (decl) == VAR_DECL
5186 && DECL_THREAD_LOCAL_P (decl))
5188 decl = emutls_decl (decl);
5189 target = get_emutls_object_name (target);
5192 #ifdef ASM_OUTPUT_DEF
5193 /* Make name accessible from other files, if appropriate. */
5195 if (TREE_PUBLIC (decl))
5197 globalize_decl (decl);
5198 maybe_assemble_visibility (decl);
5201 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5202 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file, decl, target);
5204 ASM_OUTPUT_DEF (asm_out_file,
5205 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
5206 IDENTIFIER_POINTER (target));
5208 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5213 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5214 # ifdef ASM_WEAKEN_DECL
5215 ASM_WEAKEN_DECL (asm_out_file, decl, name, IDENTIFIER_POINTER (target));
5217 ASM_OUTPUT_WEAK_ALIAS (asm_out_file, name, IDENTIFIER_POINTER (target));
5219 /* Remove this function from the pending weak list so that
5220 we do not emit multiple .weak directives for it. */
5221 for (p = &weak_decls; (t = *p) ; )
5222 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
5223 *p = TREE_CHAIN (t);
5225 p = &TREE_CHAIN (t);
5227 /* Remove weakrefs to the same target from the pending weakref
5228 list, for the same reason. */
5229 for (p = &weakref_targets; (t = *p) ; )
5231 if (DECL_ASSEMBLER_NAME (decl)
5232 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
5233 *p = TREE_CHAIN (t);
5235 p = &TREE_CHAIN (t);
5241 /* First pass of completing pending aliases. Make sure that cgraph knows
5242 which symbols will be required. */
5245 finish_aliases_1 (void)
5250 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); i++)
5254 target_decl = find_decl_and_mark_needed (p->decl, p->target);
5255 if (target_decl == NULL)
5257 if (! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
5258 error ("%q+D aliased to undefined symbol %qs",
5259 p->decl, IDENTIFIER_POINTER (p->target));
5261 else if (DECL_EXTERNAL (target_decl)
5262 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
5263 error ("%q+D aliased to external symbol %qs",
5264 p->decl, IDENTIFIER_POINTER (p->target));
5268 /* Second pass of completing pending aliases. Emit the actual assembly.
5269 This happens at the end of compilation and thus it is assured that the
5270 target symbol has been emitted. */
5273 finish_aliases_2 (void)
5278 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); i++)
5279 do_assemble_alias (p->decl, p->target);
5281 VEC_truncate (alias_pair, alias_pairs, 0);
5284 /* Emit an assembler directive to make the symbol for DECL an alias to
5285 the symbol for TARGET. */
5288 assemble_alias (tree decl, tree target)
5291 bool is_weakref = false;
5293 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
5295 tree alias = DECL_ASSEMBLER_NAME (decl);
5299 ultimate_transparent_alias_target (&target);
5301 if (alias == target)
5302 error ("weakref %q+D ultimately targets itself", decl);
5305 #ifndef ASM_OUTPUT_WEAKREF
5306 IDENTIFIER_TRANSPARENT_ALIAS (alias) = 1;
5307 TREE_CHAIN (alias) = target;
5310 if (TREE_PUBLIC (decl))
5311 error ("weakref %q+D must have static linkage", decl);
5315 #if !defined (ASM_OUTPUT_DEF)
5316 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5317 error ("%Jalias definitions not supported in this configuration", decl);
5320 if (!DECL_WEAK (decl))
5322 error ("%Jonly weak aliases are supported in this configuration", decl);
5329 /* We must force creation of DECL_RTL for debug info generation, even though
5330 we don't use it here. */
5331 make_decl_rtl (decl);
5332 TREE_USED (decl) = 1;
5334 /* A quirk of the initial implementation of aliases required that the user
5335 add "extern" to all of them. Which is silly, but now historical. Do
5336 note that the symbol is in fact locally defined. */
5338 DECL_EXTERNAL (decl) = 0;
5340 /* Allow aliases to aliases. */
5341 if (TREE_CODE (decl) == FUNCTION_DECL)
5342 cgraph_node (decl)->alias = true;
5344 varpool_node (decl)->alias = true;
5346 /* If the target has already been emitted, we don't have to queue the
5347 alias. This saves a tad o memory. */
5348 target_decl = find_decl_and_mark_needed (decl, target);
5349 if (target_decl && TREE_ASM_WRITTEN (target_decl))
5350 do_assemble_alias (decl, target);
5353 alias_pair *p = VEC_safe_push (alias_pair, gc, alias_pairs, NULL);
5359 /* Emit an assembler directive to set symbol for DECL visibility to
5360 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5363 default_assemble_visibility (tree decl, int vis)
5365 static const char * const visibility_types[] = {
5366 NULL, "protected", "hidden", "internal"
5369 const char *name, *type;
5371 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5372 type = visibility_types[vis];
5374 #ifdef HAVE_GAS_HIDDEN
5375 fprintf (asm_out_file, "\t.%s\t", type);
5376 assemble_name (asm_out_file, name);
5377 fprintf (asm_out_file, "\n");
5379 warning (OPT_Wattributes, "visibility attribute not supported "
5380 "in this configuration; ignored");
5384 /* A helper function to call assemble_visibility when needed for a decl. */
5387 maybe_assemble_visibility (tree decl)
5389 enum symbol_visibility vis = DECL_VISIBILITY (decl);
5391 if (vis != VISIBILITY_DEFAULT)
5393 targetm.asm_out.visibility (decl, vis);
5400 /* Returns 1 if the target configuration supports defining public symbols
5401 so that one of them will be chosen at link time instead of generating a
5402 multiply-defined symbol error, whether through the use of weak symbols or
5403 a target-specific mechanism for having duplicates discarded. */
5406 supports_one_only (void)
5408 if (SUPPORTS_ONE_ONLY)
5410 return SUPPORTS_WEAK;
5413 /* Set up DECL as a public symbol that can be defined in multiple
5414 translation units without generating a linker error. */
5417 make_decl_one_only (tree decl)
5419 gcc_assert (TREE_CODE (decl) == VAR_DECL
5420 || TREE_CODE (decl) == FUNCTION_DECL);
5422 TREE_PUBLIC (decl) = 1;
5424 if (SUPPORTS_ONE_ONLY)
5426 #ifdef MAKE_DECL_ONE_ONLY
5427 MAKE_DECL_ONE_ONLY (decl);
5429 DECL_ONE_ONLY (decl) = 1;
5431 else if (TREE_CODE (decl) == VAR_DECL
5432 && (DECL_INITIAL (decl) == 0 || DECL_INITIAL (decl) == error_mark_node))
5433 DECL_COMMON (decl) = 1;
5436 gcc_assert (SUPPORTS_WEAK);
5437 DECL_WEAK (decl) = 1;
5442 init_varasm_once (void)
5444 section_htab = htab_create_ggc (31, section_entry_hash,
5445 section_entry_eq, NULL);
5446 object_block_htab = htab_create_ggc (31, object_block_entry_hash,
5447 object_block_entry_eq, NULL);
5448 const_desc_htab = htab_create_ggc (1009, const_desc_hash,
5449 const_desc_eq, NULL);
5451 const_alias_set = new_alias_set ();
5452 shared_constant_pool = create_constant_pool ();
5454 #ifdef TEXT_SECTION_ASM_OP
5455 text_section = get_unnamed_section (SECTION_CODE, output_section_asm_op,
5456 TEXT_SECTION_ASM_OP);
5459 #ifdef DATA_SECTION_ASM_OP
5460 data_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
5461 DATA_SECTION_ASM_OP);
5464 #ifdef SDATA_SECTION_ASM_OP
5465 sdata_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
5466 SDATA_SECTION_ASM_OP);
5469 #ifdef READONLY_DATA_SECTION_ASM_OP
5470 readonly_data_section = get_unnamed_section (0, output_section_asm_op,
5471 READONLY_DATA_SECTION_ASM_OP);
5474 #ifdef CTORS_SECTION_ASM_OP
5475 ctors_section = get_unnamed_section (0, output_section_asm_op,
5476 CTORS_SECTION_ASM_OP);
5479 #ifdef DTORS_SECTION_ASM_OP
5480 dtors_section = get_unnamed_section (0, output_section_asm_op,
5481 DTORS_SECTION_ASM_OP);
5484 #ifdef BSS_SECTION_ASM_OP
5485 bss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
5486 output_section_asm_op,
5487 BSS_SECTION_ASM_OP);
5490 #ifdef SBSS_SECTION_ASM_OP
5491 sbss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
5492 output_section_asm_op,
5493 SBSS_SECTION_ASM_OP);
5496 tls_comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5497 | SECTION_COMMON, emit_tls_common);
5498 lcomm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5499 | SECTION_COMMON, emit_local);
5500 comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5501 | SECTION_COMMON, emit_common);
5503 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
5504 bss_noswitch_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS,
5508 targetm.asm_out.init_sections ();
5510 if (readonly_data_section == NULL)
5511 readonly_data_section = text_section;
5515 decl_default_tls_model (tree decl)
5517 enum tls_model kind;
5520 is_local = targetm.binds_local_p (decl);
5524 kind = TLS_MODEL_LOCAL_EXEC;
5526 kind = TLS_MODEL_INITIAL_EXEC;
5529 /* Local dynamic is inefficient when we're not combining the
5530 parts of the address. */
5531 else if (optimize && is_local)
5532 kind = TLS_MODEL_LOCAL_DYNAMIC;
5534 kind = TLS_MODEL_GLOBAL_DYNAMIC;
5535 if (kind < flag_tls_default)
5536 kind = flag_tls_default;
5541 /* Select a set of attributes for section NAME based on the properties
5542 of DECL and whether or not RELOC indicates that DECL's initializer
5543 might contain runtime relocations.
5545 We make the section read-only and executable for a function decl,
5546 read-only for a const data decl, and writable for a non-const data decl. */
5549 default_section_type_flags (tree decl, const char *name, int reloc)
5553 if (decl && TREE_CODE (decl) == FUNCTION_DECL)
5554 flags = SECTION_CODE;
5555 else if (decl && decl_readonly_section (decl, reloc))
5557 else if (current_function_decl
5559 && cfun->unlikely_text_section_name
5560 && strcmp (name, cfun->unlikely_text_section_name) == 0)
5561 flags = SECTION_CODE;
5563 && (!current_function_decl || !cfun)
5564 && strcmp (name, UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
5565 flags = SECTION_CODE;
5567 flags = SECTION_WRITE;
5569 if (decl && DECL_ONE_ONLY (decl))
5570 flags |= SECTION_LINKONCE;
5572 if (decl && TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
5573 flags |= SECTION_TLS | SECTION_WRITE;
5575 if (strcmp (name, ".bss") == 0
5576 || strncmp (name, ".bss.", 5) == 0
5577 || strncmp (name, ".gnu.linkonce.b.", 16) == 0
5578 || strcmp (name, ".sbss") == 0
5579 || strncmp (name, ".sbss.", 6) == 0
5580 || strncmp (name, ".gnu.linkonce.sb.", 17) == 0)
5581 flags |= SECTION_BSS;
5583 if (strcmp (name, ".tdata") == 0
5584 || strncmp (name, ".tdata.", 7) == 0
5585 || strncmp (name, ".gnu.linkonce.td.", 17) == 0)
5586 flags |= SECTION_TLS;
5588 if (strcmp (name, ".tbss") == 0
5589 || strncmp (name, ".tbss.", 6) == 0
5590 || strncmp (name, ".gnu.linkonce.tb.", 17) == 0)
5591 flags |= SECTION_TLS | SECTION_BSS;
5593 /* These three sections have special ELF types. They are neither
5594 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
5595 want to print a section type (@progbits or @nobits). If someone
5596 is silly enough to emit code or TLS variables to one of these
5597 sections, then don't handle them specially. */
5598 if (!(flags & (SECTION_CODE | SECTION_BSS | SECTION_TLS))
5599 && (strcmp (name, ".init_array") == 0
5600 || strcmp (name, ".fini_array") == 0
5601 || strcmp (name, ".preinit_array") == 0))
5602 flags |= SECTION_NOTYPE;
5607 /* Return true if the target supports some form of global BSS,
5608 either through bss_noswitch_section, or by selecting a BSS
5609 section in TARGET_ASM_SELECT_SECTION. */
5612 have_global_bss_p (void)
5614 return bss_noswitch_section || targetm.have_switchable_bss_sections;
5617 /* Output assembly to switch to section NAME with attribute FLAGS.
5618 Four variants for common object file formats. */
5621 default_no_named_section (const char *name ATTRIBUTE_UNUSED,
5622 unsigned int flags ATTRIBUTE_UNUSED,
5623 tree decl ATTRIBUTE_UNUSED)
5625 /* Some object formats don't support named sections at all. The
5626 front-end should already have flagged this as an error. */
5631 default_elf_asm_named_section (const char *name, unsigned int flags,
5632 tree decl ATTRIBUTE_UNUSED)
5634 char flagchars[10], *f = flagchars;
5636 /* If we have already declared this section, we can use an
5637 abbreviated form to switch back to it -- unless this section is
5638 part of a COMDAT groups, in which case GAS requires the full
5639 declaration every time. */
5640 if (!(HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5641 && (flags & SECTION_DECLARED))
5643 fprintf (asm_out_file, "\t.section\t%s\n", name);
5647 if (!(flags & SECTION_DEBUG))
5649 if (flags & SECTION_WRITE)
5651 if (flags & SECTION_CODE)
5653 if (flags & SECTION_SMALL)
5655 if (flags & SECTION_MERGE)
5657 if (flags & SECTION_STRINGS)
5659 if (flags & SECTION_TLS)
5661 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5665 fprintf (asm_out_file, "\t.section\t%s,\"%s\"", name, flagchars);
5667 if (!(flags & SECTION_NOTYPE))
5672 if (flags & SECTION_BSS)
5678 #ifdef ASM_COMMENT_START
5679 /* On platforms that use "@" as the assembly comment character,
5681 if (strcmp (ASM_COMMENT_START, "@") == 0)
5684 fprintf (asm_out_file, format, type);
5686 if (flags & SECTION_ENTSIZE)
5687 fprintf (asm_out_file, ",%d", flags & SECTION_ENTSIZE);
5688 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5689 fprintf (asm_out_file, ",%s,comdat",
5690 lang_hooks.decls.comdat_group (decl));
5693 putc ('\n', asm_out_file);
5697 default_coff_asm_named_section (const char *name, unsigned int flags,
5698 tree decl ATTRIBUTE_UNUSED)
5700 char flagchars[8], *f = flagchars;
5702 if (flags & SECTION_WRITE)
5704 if (flags & SECTION_CODE)
5708 fprintf (asm_out_file, "\t.section\t%s,\"%s\"\n", name, flagchars);
5712 default_pe_asm_named_section (const char *name, unsigned int flags,
5715 default_coff_asm_named_section (name, flags, decl);
5717 if (flags & SECTION_LINKONCE)
5719 /* Functions may have been compiled at various levels of
5720 optimization so we can't use `same_size' here.
5721 Instead, have the linker pick one. */
5722 fprintf (asm_out_file, "\t.linkonce %s\n",
5723 (flags & SECTION_CODE ? "discard" : "same_size"));
5727 /* The lame default section selector. */
5730 default_select_section (tree decl, int reloc,
5731 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
5735 if (decl_readonly_section (decl, reloc))
5736 return readonly_data_section;
5738 else if (TREE_CODE (decl) == CONSTRUCTOR)
5740 if (! ((flag_pic && reloc)
5741 || !TREE_READONLY (decl)
5742 || TREE_SIDE_EFFECTS (decl)
5743 || !TREE_CONSTANT (decl)))
5744 return readonly_data_section;
5746 else if (TREE_CODE (decl) == STRING_CST)
5747 return readonly_data_section;
5748 else if (! (flag_pic && reloc))
5749 return readonly_data_section;
5751 return data_section;
5754 enum section_category
5755 categorize_decl_for_section (tree decl, int reloc)
5757 enum section_category ret;
5759 if (TREE_CODE (decl) == FUNCTION_DECL)
5761 else if (TREE_CODE (decl) == STRING_CST)
5763 if (flag_mudflap) /* or !flag_merge_constants */
5764 return SECCAT_RODATA;
5766 return SECCAT_RODATA_MERGE_STR;
5768 else if (TREE_CODE (decl) == VAR_DECL)
5770 if (bss_initializer_p (decl))
5772 else if (! TREE_READONLY (decl)
5773 || TREE_SIDE_EFFECTS (decl)
5774 || ! TREE_CONSTANT (DECL_INITIAL (decl)))
5776 /* Here the reloc_rw_mask is not testing whether the section should
5777 be read-only or not, but whether the dynamic link will have to
5778 do something. If so, we wish to segregate the data in order to
5779 minimize cache misses inside the dynamic linker. */
5780 if (reloc & targetm.asm_out.reloc_rw_mask ())
5781 ret = reloc == 1 ? SECCAT_DATA_REL_LOCAL : SECCAT_DATA_REL;
5785 else if (reloc & targetm.asm_out.reloc_rw_mask ())
5786 ret = reloc == 1 ? SECCAT_DATA_REL_RO_LOCAL : SECCAT_DATA_REL_RO;
5787 else if (reloc || flag_merge_constants < 2)
5788 /* C and C++ don't allow different variables to share the same
5789 location. -fmerge-all-constants allows even that (at the
5790 expense of not conforming). */
5791 ret = SECCAT_RODATA;
5792 else if (TREE_CODE (DECL_INITIAL (decl)) == STRING_CST)
5793 ret = SECCAT_RODATA_MERGE_STR_INIT;
5795 ret = SECCAT_RODATA_MERGE_CONST;
5797 else if (TREE_CODE (decl) == CONSTRUCTOR)
5799 if ((reloc & targetm.asm_out.reloc_rw_mask ())
5800 || TREE_SIDE_EFFECTS (decl)
5801 || ! TREE_CONSTANT (decl))
5804 ret = SECCAT_RODATA;
5807 ret = SECCAT_RODATA;
5809 /* There are no read-only thread-local sections. */
5810 if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
5812 /* Note that this would be *just* SECCAT_BSS, except that there's
5813 no concept of a read-only thread-local-data section. */
5814 if (ret == SECCAT_BSS
5815 || (flag_zero_initialized_in_bss
5816 && initializer_zerop (DECL_INITIAL (decl))))
5822 /* If the target uses small data sections, select it. */
5823 else if (targetm.in_small_data_p (decl))
5825 if (ret == SECCAT_BSS)
5827 else if (targetm.have_srodata_section && ret == SECCAT_RODATA)
5828 ret = SECCAT_SRODATA;
5837 decl_readonly_section (tree decl, int reloc)
5839 switch (categorize_decl_for_section (decl, reloc))
5842 case SECCAT_RODATA_MERGE_STR:
5843 case SECCAT_RODATA_MERGE_STR_INIT:
5844 case SECCAT_RODATA_MERGE_CONST:
5845 case SECCAT_SRODATA:
5854 /* Select a section based on the above categorization. */
5857 default_elf_select_section (tree decl, int reloc,
5858 unsigned HOST_WIDE_INT align)
5861 switch (categorize_decl_for_section (decl, reloc))
5864 /* We're not supposed to be called on FUNCTION_DECLs. */
5867 return readonly_data_section;
5868 case SECCAT_RODATA_MERGE_STR:
5869 return mergeable_string_section (decl, align, 0);
5870 case SECCAT_RODATA_MERGE_STR_INIT:
5871 return mergeable_string_section (DECL_INITIAL (decl), align, 0);
5872 case SECCAT_RODATA_MERGE_CONST:
5873 return mergeable_constant_section (DECL_MODE (decl), align, 0);
5874 case SECCAT_SRODATA:
5878 return data_section;
5879 case SECCAT_DATA_REL:
5880 sname = ".data.rel";
5882 case SECCAT_DATA_REL_LOCAL:
5883 sname = ".data.rel.local";
5885 case SECCAT_DATA_REL_RO:
5886 sname = ".data.rel.ro";
5888 case SECCAT_DATA_REL_RO_LOCAL:
5889 sname = ".data.rel.ro.local";
5914 return get_named_section (decl, sname, reloc);
5917 /* Construct a unique section name based on the decl name and the
5918 categorization performed above. */
5921 default_unique_section (tree decl, int reloc)
5923 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
5924 bool one_only = DECL_ONE_ONLY (decl) && !HAVE_COMDAT_GROUP;
5925 const char *prefix, *name;
5929 switch (categorize_decl_for_section (decl, reloc))
5932 prefix = one_only ? ".gnu.linkonce.t." : ".text.";
5935 case SECCAT_RODATA_MERGE_STR:
5936 case SECCAT_RODATA_MERGE_STR_INIT:
5937 case SECCAT_RODATA_MERGE_CONST:
5938 prefix = one_only ? ".gnu.linkonce.r." : ".rodata.";
5940 case SECCAT_SRODATA:
5941 prefix = one_only ? ".gnu.linkonce.s2." : ".sdata2.";
5944 prefix = one_only ? ".gnu.linkonce.d." : ".data.";
5946 case SECCAT_DATA_REL:
5947 prefix = one_only ? ".gnu.linkonce.d.rel." : ".data.rel.";
5949 case SECCAT_DATA_REL_LOCAL:
5950 prefix = one_only ? ".gnu.linkonce.d.rel.local." : ".data.rel.local.";
5952 case SECCAT_DATA_REL_RO:
5953 prefix = one_only ? ".gnu.linkonce.d.rel.ro." : ".data.rel.ro.";
5955 case SECCAT_DATA_REL_RO_LOCAL:
5956 prefix = one_only ? ".gnu.linkonce.d.rel.ro.local."
5957 : ".data.rel.ro.local.";
5960 prefix = one_only ? ".gnu.linkonce.s." : ".sdata.";
5963 prefix = one_only ? ".gnu.linkonce.b." : ".bss.";
5966 prefix = one_only ? ".gnu.linkonce.sb." : ".sbss.";
5969 prefix = one_only ? ".gnu.linkonce.td." : ".tdata.";
5972 prefix = one_only ? ".gnu.linkonce.tb." : ".tbss.";
5977 plen = strlen (prefix);
5979 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5980 name = targetm.strip_name_encoding (name);
5981 nlen = strlen (name);
5983 string = alloca (nlen + plen + 1);
5984 memcpy (string, prefix, plen);
5985 memcpy (string + plen, name, nlen + 1);
5987 DECL_SECTION_NAME (decl) = build_string (nlen + plen, string);
5990 /* Like compute_reloc_for_constant, except for an RTX. The return value
5991 is a mask for which bit 1 indicates a global relocation, and bit 0
5992 indicates a local relocation. */
5995 compute_reloc_for_rtx_1 (rtx *xp, void *data)
6000 switch (GET_CODE (x))
6003 *preloc |= SYMBOL_REF_LOCAL_P (x) ? 1 : 2;
6016 compute_reloc_for_rtx (rtx x)
6020 switch (GET_CODE (x))
6026 for_each_rtx (&x, compute_reloc_for_rtx_1, &reloc);
6035 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED,
6037 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
6039 if (compute_reloc_for_rtx (x) & targetm.asm_out.reloc_rw_mask ())
6040 return data_section;
6042 return readonly_data_section;
6046 default_elf_select_rtx_section (enum machine_mode mode, rtx x,
6047 unsigned HOST_WIDE_INT align)
6049 int reloc = compute_reloc_for_rtx (x);
6051 /* ??? Handle small data here somehow. */
6053 if (reloc & targetm.asm_out.reloc_rw_mask ())
6056 return get_named_section (NULL, ".data.rel.ro.local", 1);
6058 return get_named_section (NULL, ".data.rel.ro", 3);
6061 return mergeable_constant_section (mode, align, 0);
6064 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6067 default_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
6072 /* Careful not to prod global register variables. */
6075 symbol = XEXP (rtl, 0);
6076 if (GET_CODE (symbol) != SYMBOL_REF)
6079 flags = SYMBOL_REF_FLAGS (symbol) & SYMBOL_FLAG_HAS_BLOCK_INFO;
6080 if (TREE_CODE (decl) == FUNCTION_DECL)
6081 flags |= SYMBOL_FLAG_FUNCTION;
6082 if (targetm.binds_local_p (decl))
6083 flags |= SYMBOL_FLAG_LOCAL;
6084 if (targetm.have_tls && TREE_CODE (decl) == VAR_DECL
6085 && DECL_THREAD_LOCAL_P (decl))
6086 flags |= DECL_TLS_MODEL (decl) << SYMBOL_FLAG_TLS_SHIFT;
6087 else if (targetm.in_small_data_p (decl))
6088 flags |= SYMBOL_FLAG_SMALL;
6089 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6090 being PUBLIC, the thing *must* be defined in this translation unit.
6091 Prevent this buglet from being propagated into rtl code as well. */
6092 if (DECL_P (decl) && DECL_EXTERNAL (decl) && TREE_PUBLIC (decl))
6093 flags |= SYMBOL_FLAG_EXTERNAL;
6095 SYMBOL_REF_FLAGS (symbol) = flags;
6098 /* By default, we do nothing for encode_section_info, so we need not
6099 do anything but discard the '*' marker. */
6102 default_strip_name_encoding (const char *str)
6104 return str + (*str == '*');
6107 #ifdef ASM_OUTPUT_DEF
6108 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6109 anchor relative to ".", the current section position. */
6112 default_asm_output_anchor (rtx symbol)
6116 sprintf (buffer, "*. + " HOST_WIDE_INT_PRINT_DEC,
6117 SYMBOL_REF_BLOCK_OFFSET (symbol));
6118 ASM_OUTPUT_DEF (asm_out_file, XSTR (symbol, 0), buffer);
6122 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6125 default_use_anchors_for_symbol_p (rtx symbol)
6130 /* Don't use anchors for mergeable sections. The linker might move
6131 the objects around. */
6132 sect = SYMBOL_REF_BLOCK (symbol)->sect;
6133 if (sect->common.flags & SECTION_MERGE)
6136 /* Don't use anchors for small data sections. The small data register
6137 acts as an anchor for such sections. */
6138 if (sect->common.flags & SECTION_SMALL)
6141 decl = SYMBOL_REF_DECL (symbol);
6142 if (decl && DECL_P (decl))
6144 /* Don't use section anchors for decls that might be defined by
6146 if (!targetm.binds_local_p (decl))
6149 /* Don't use section anchors for decls that will be placed in a
6150 small data section. */
6151 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6152 one above. The problem is that we only use SECTION_SMALL for
6153 sections that should be marked as small in the section directive. */
6154 if (targetm.in_small_data_p (decl))
6160 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6161 wrt cross-module name binding. */
6164 default_binds_local_p (tree exp)
6166 return default_binds_local_p_1 (exp, flag_shlib);
6170 default_binds_local_p_1 (tree exp, int shlib)
6174 /* A non-decl is an entry in the constant pool. */
6177 /* Weakrefs may not bind locally, even though the weakref itself is
6178 always static and therefore local. */
6179 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp)))
6181 /* Static variables are always local. */
6182 else if (! TREE_PUBLIC (exp))
6184 /* A variable is local if the user has said explicitly that it will
6186 else if (DECL_VISIBILITY_SPECIFIED (exp)
6187 && DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
6189 /* Variables defined outside this object might not be local. */
6190 else if (DECL_EXTERNAL (exp))
6192 /* If defined in this object and visibility is not default, must be
6194 else if (DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
6196 /* Default visibility weak data can be overridden by a strong symbol
6197 in another module and so are not local. */
6198 else if (DECL_WEAK (exp))
6200 /* If PIC, then assume that any global name can be overridden by
6201 symbols resolved from other modules, unless we are compiling with
6202 -fwhole-program, which assumes that names are local. */
6204 local_p = flag_whole_program;
6205 /* Uninitialized COMMON variable may be unified with symbols
6206 resolved from other modules. */
6207 else if (DECL_COMMON (exp)
6208 && (DECL_INITIAL (exp) == NULL
6209 || DECL_INITIAL (exp) == error_mark_node))
6211 /* Otherwise we're left with initialized (or non-common) global data
6212 which is of necessity defined locally. */
6219 /* Determine whether or not a pointer mode is valid. Assume defaults
6220 of ptr_mode or Pmode - can be overridden. */
6222 default_valid_pointer_mode (enum machine_mode mode)
6224 return (mode == ptr_mode || mode == Pmode);
6227 /* Default function to output code that will globalize a label. A
6228 target must define GLOBAL_ASM_OP or provide its own function to
6229 globalize a label. */
6230 #ifdef GLOBAL_ASM_OP
6232 default_globalize_label (FILE * stream, const char *name)
6234 fputs (GLOBAL_ASM_OP, stream);
6235 assemble_name (stream, name);
6236 putc ('\n', stream);
6238 #endif /* GLOBAL_ASM_OP */
6240 /* Default function to output code that will globalize a declaration. */
6242 default_globalize_decl_name (FILE * stream, tree decl)
6244 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
6245 targetm.asm_out.globalize_label (stream, name);
6248 /* Default function to output a label for unwind information. The
6249 default is to do nothing. A target that needs nonlocal labels for
6250 unwind information must provide its own function to do this. */
6252 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED,
6253 tree decl ATTRIBUTE_UNUSED,
6254 int for_eh ATTRIBUTE_UNUSED,
6255 int empty ATTRIBUTE_UNUSED)
6259 /* Default function to output a label to divide up the exception table.
6260 The default is to do nothing. A target that needs/wants to divide
6261 up the table must provide it's own function to do this. */
6263 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED)
6267 /* This is how to output an internal numbered label where PREFIX is
6268 the class of label and LABELNO is the number within the class. */
6271 default_internal_label (FILE *stream, const char *prefix,
6272 unsigned long labelno)
6274 char *const buf = alloca (40 + strlen (prefix));
6275 ASM_GENERATE_INTERNAL_LABEL (buf, prefix, labelno);
6276 ASM_OUTPUT_INTERNAL_LABEL (stream, buf);
6279 /* This is the default behavior at the beginning of a file. It's
6280 controlled by two other target-hook toggles. */
6282 default_file_start (void)
6284 if (targetm.file_start_app_off && !flag_verbose_asm)
6285 fputs (ASM_APP_OFF, asm_out_file);
6287 if (targetm.file_start_file_directive)
6288 output_file_directive (asm_out_file, main_input_filename);
6291 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6292 which emits a special section directive used to indicate whether or
6293 not this object file needs an executable stack. This is primarily
6294 a GNU extension to ELF but could be used on other targets. */
6296 int trampolines_created;
6299 file_end_indicate_exec_stack (void)
6301 unsigned int flags = SECTION_DEBUG;
6302 if (trampolines_created)
6303 flags |= SECTION_CODE;
6305 switch_to_section (get_section (".note.GNU-stack", flags, NULL));
6308 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6309 a get_unnamed_section callback. */
6312 output_section_asm_op (const void *directive)
6314 fprintf (asm_out_file, "%s\n", (const char *) directive);
6317 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6318 the current section is NEW_SECTION. */
6321 switch_to_section (section *new_section)
6323 if (in_section == new_section)
6326 if (new_section->common.flags & SECTION_FORGET)
6329 in_section = new_section;
6331 switch (SECTION_STYLE (new_section))
6335 && !cfun->unlikely_text_section_name
6336 && strcmp (new_section->named.name,
6337 UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
6338 cfun->unlikely_text_section_name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
6340 targetm.asm_out.named_section (new_section->named.name,
6341 new_section->named.common.flags,
6342 new_section->named.decl);
6345 case SECTION_UNNAMED:
6346 new_section->unnamed.callback (new_section->unnamed.data);
6349 case SECTION_NOSWITCH:
6354 new_section->common.flags |= SECTION_DECLARED;
6357 /* If block symbol SYMBOL has not yet been assigned an offset, place
6358 it at the end of its block. */
6361 place_block_symbol (rtx symbol)
6363 unsigned HOST_WIDE_INT size, mask, offset;
6364 struct constant_descriptor_rtx *desc;
6365 unsigned int alignment;
6366 struct object_block *block;
6369 gcc_assert (SYMBOL_REF_BLOCK (symbol));
6370 if (SYMBOL_REF_BLOCK_OFFSET (symbol) >= 0)
6373 /* Work out the symbol's size and alignment. */
6374 if (CONSTANT_POOL_ADDRESS_P (symbol))
6376 desc = SYMBOL_REF_CONSTANT (symbol);
6377 alignment = desc->align;
6378 size = GET_MODE_SIZE (desc->mode);
6380 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
6382 decl = SYMBOL_REF_DECL (symbol);
6383 alignment = get_constant_alignment (decl);
6384 size = get_constant_size (decl);
6388 decl = SYMBOL_REF_DECL (symbol);
6389 alignment = DECL_ALIGN (decl);
6390 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
6393 /* Calculate the object's offset from the start of the block. */
6394 block = SYMBOL_REF_BLOCK (symbol);
6395 mask = alignment / BITS_PER_UNIT - 1;
6396 offset = (block->size + mask) & ~mask;
6397 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
6399 /* Record the block's new alignment and size. */
6400 block->alignment = MAX (block->alignment, alignment);
6401 block->size = offset + size;
6403 VEC_safe_push (rtx, gc, block->objects, symbol);
6406 /* Return the anchor that should be used to address byte offset OFFSET
6407 from the first object in BLOCK. MODEL is the TLS model used
6411 get_section_anchor (struct object_block *block, HOST_WIDE_INT offset,
6412 enum tls_model model)
6415 unsigned int begin, middle, end;
6416 unsigned HOST_WIDE_INT min_offset, max_offset, range, bias, delta;
6419 /* Work out the anchor's offset. Use an offset of 0 for the first
6420 anchor so that we don't pessimize the case where we take the address
6421 of a variable at the beginning of the block. This is particularly
6422 useful when a block has only one variable assigned to it.
6424 We try to place anchors RANGE bytes apart, so there can then be
6425 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
6426 a ptr_mode offset. With some target settings, the lowest such
6427 anchor might be out of range for the lowest ptr_mode offset;
6428 likewise the highest anchor for the highest offset. Use anchors
6429 at the extreme ends of the ptr_mode range in such cases.
6431 All arithmetic uses unsigned integers in order to avoid
6433 max_offset = (unsigned HOST_WIDE_INT) targetm.max_anchor_offset;
6434 min_offset = (unsigned HOST_WIDE_INT) targetm.min_anchor_offset;
6435 range = max_offset - min_offset + 1;
6440 bias = 1 << (GET_MODE_BITSIZE (ptr_mode) - 1);
6443 delta = -(unsigned HOST_WIDE_INT) offset + max_offset;
6444 delta -= delta % range;
6447 offset = (HOST_WIDE_INT) (-delta);
6451 delta = (unsigned HOST_WIDE_INT) offset - min_offset;
6452 delta -= delta % range;
6453 if (delta > bias - 1)
6455 offset = (HOST_WIDE_INT) delta;
6459 /* Do a binary search to see if there's already an anchor we can use.
6460 Set BEGIN to the new anchor's index if not. */
6462 end = VEC_length (rtx, block->anchors);
6463 while (begin != end)
6465 middle = (end + begin) / 2;
6466 anchor = VEC_index (rtx, block->anchors, middle);
6467 if (SYMBOL_REF_BLOCK_OFFSET (anchor) > offset)
6469 else if (SYMBOL_REF_BLOCK_OFFSET (anchor) < offset)
6471 else if (SYMBOL_REF_TLS_MODEL (anchor) > model)
6473 else if (SYMBOL_REF_TLS_MODEL (anchor) < model)
6479 /* Create a new anchor with a unique label. */
6480 ASM_GENERATE_INTERNAL_LABEL (label, "LANCHOR", anchor_labelno++);
6481 anchor = create_block_symbol (ggc_strdup (label), block, offset);
6482 SYMBOL_REF_FLAGS (anchor) |= SYMBOL_FLAG_LOCAL | SYMBOL_FLAG_ANCHOR;
6483 SYMBOL_REF_FLAGS (anchor) |= model << SYMBOL_FLAG_TLS_SHIFT;
6485 /* Insert it at index BEGIN. */
6486 VEC_safe_insert (rtx, gc, block->anchors, begin, anchor);
6490 /* Output the objects in BLOCK. */
6493 output_object_block (struct object_block *block)
6495 struct constant_descriptor_rtx *desc;
6497 HOST_WIDE_INT offset;
6501 if (block->objects == NULL)
6504 /* Switch to the section and make sure that the first byte is
6505 suitably aligned. */
6506 switch_to_section (block->sect);
6507 assemble_align (block->alignment);
6509 /* Define the values of all anchors relative to the current section
6511 for (i = 0; VEC_iterate (rtx, block->anchors, i, symbol); i++)
6512 targetm.asm_out.output_anchor (symbol);
6514 /* Output the objects themselves. */
6516 for (i = 0; VEC_iterate (rtx, block->objects, i, symbol); i++)
6518 /* Move to the object's offset, padding with zeros if necessary. */
6519 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol) - offset);
6520 offset = SYMBOL_REF_BLOCK_OFFSET (symbol);
6521 if (CONSTANT_POOL_ADDRESS_P (symbol))
6523 desc = SYMBOL_REF_CONSTANT (symbol);
6524 output_constant_pool_1 (desc, 1);
6525 offset += GET_MODE_SIZE (desc->mode);
6527 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
6529 decl = SYMBOL_REF_DECL (symbol);
6530 assemble_constant_contents (decl, XSTR (symbol, 0),
6531 get_constant_alignment (decl));
6532 offset += get_constant_size (decl);
6536 decl = SYMBOL_REF_DECL (symbol);
6537 assemble_variable_contents (decl, XSTR (symbol, 0), false);
6538 offset += tree_low_cst (DECL_SIZE_UNIT (decl), 1);
6543 /* A htab_traverse callback used to call output_object_block for
6544 each member of object_block_htab. */
6547 output_object_block_htab (void **slot, void *data ATTRIBUTE_UNUSED)
6549 output_object_block ((struct object_block *) (*slot));
6553 /* Output the definitions of all object_blocks. */
6556 output_object_blocks (void)
6558 htab_traverse (object_block_htab, output_object_block_htab, NULL);
6561 /* This function provides a possible implementation of the
6562 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
6563 by -frecord-gcc-switches it creates a new mergeable, string section in the
6564 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
6565 contains the switches in ASCII format.
6567 FIXME: This code does not correctly handle double quote characters
6568 that appear inside strings, (it strips them rather than preserving them).
6569 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
6570 characters - instead it treats them as sub-string separators. Since
6571 we want to emit NUL strings terminators into the object file we have to use
6575 elf_record_gcc_switches (print_switch_type type, const char * name)
6577 static char buffer[1024];
6579 /* This variable is used as part of a simplistic heuristic to detect
6580 command line switches which take an argument:
6582 "If a command line option does not start with a dash then
6583 it is an argument for the previous command line option."
6585 This fails in the case of the command line option which is the name
6586 of the file to compile, but otherwise it is pretty reasonable. */
6587 static bool previous_name_held_back = FALSE;
6591 case SWITCH_TYPE_PASSED:
6594 if (previous_name_held_back)
6596 unsigned int len = strlen (buffer);
6598 snprintf (buffer + len, sizeof buffer - len, " %s", name);
6599 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
6600 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
6601 previous_name_held_back = FALSE;
6605 strncpy (buffer, name, sizeof buffer);
6606 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
6607 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
6612 if (previous_name_held_back)
6614 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
6615 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
6618 strncpy (buffer, name, sizeof buffer);
6619 previous_name_held_back = TRUE;
6623 case SWITCH_TYPE_DESCRIPTIVE:
6626 /* Distinguish between invocations where name is NULL. */
6627 static bool started = false;
6631 if (previous_name_held_back)
6633 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
6634 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
6641 sec = get_section (targetm.asm_out.record_gcc_switches_section,
6645 | (SECTION_ENTSIZE & 1),
6647 switch_to_section (sec);
6656 /* The return value is currently ignored by the caller, but must be 0.
6657 For -fverbose-asm the return value would be the number of characters
6658 emitted into the assembler file. */
6662 /* Emit text to declare externally defined symbols. It is needed to
6663 properly support non-default visibility. */
6665 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED,
6667 const char *name ATTRIBUTE_UNUSED)
6669 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
6670 set in order to avoid putting out names that are never really
6672 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
6673 && targetm.binds_local_p (decl))
6674 maybe_assemble_visibility (decl);
6677 #include "gt-varasm.h"