1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997,
3 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
4 2010 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
23 /* This file handles generation of all the assembler code
24 *except* the instructions of a function.
25 This includes declarations of variables and their initial values.
27 We also output the assembler code for constants stored in memory
28 and are responsible for combining constants with the same value. */
32 #include "coretypes.h"
39 #include "hard-reg-set.h"
46 #include "langhooks.h"
50 #include "targhooks.h"
51 #include "tree-mudflap.h"
53 #include "cfglayout.h"
54 #include "basic-block.h"
55 #include "tree-iterator.h"
57 #ifdef XCOFF_DEBUGGING_INFO
58 #include "xcoffout.h" /* Needed for external data
59 declarations for e.g. AIX 4.x. */
62 /* The (assembler) name of the first globally-visible object output. */
63 extern GTY(()) const char *first_global_object_name;
64 extern GTY(()) const char *weak_global_object_name;
66 const char *first_global_object_name;
67 const char *weak_global_object_name;
70 struct constant_descriptor_rtx;
71 struct rtx_constant_pool;
73 #define n_deferred_constants (crtl->varasm.deferred_constants)
75 /* Number for making the label on the next
76 constant that is stored in memory. */
78 static GTY(()) int const_labelno;
80 /* Carry information from ASM_DECLARE_OBJECT_NAME
81 to ASM_FINISH_DECLARE_OBJECT. */
83 int size_directive_output;
85 /* The last decl for which assemble_variable was called,
86 if it did ASM_DECLARE_OBJECT_NAME.
87 If the last call to assemble_variable didn't do that,
90 tree last_assemble_variable_decl;
92 /* The following global variable indicates if the first basic block
93 in a function belongs to the cold partition or not. */
95 bool first_function_block_is_cold;
97 /* We give all constants their own alias set. Perhaps redundant with
98 MEM_READONLY_P, but pre-dates it. */
100 static alias_set_type const_alias_set;
102 static const char *strip_reg_name (const char *);
103 static int contains_pointers_p (tree);
104 #ifdef ASM_OUTPUT_EXTERNAL
105 static bool incorporeal_function_p (tree);
107 static void decode_addr_const (tree, struct addr_const *);
108 static hashval_t const_desc_hash (const void *);
109 static int const_desc_eq (const void *, const void *);
110 static hashval_t const_hash_1 (const tree);
111 static int compare_constant (const tree, const tree);
112 static tree copy_constant (tree);
113 static void output_constant_def_contents (rtx);
114 static void output_addressed_constants (tree);
115 static unsigned HOST_WIDE_INT array_size_for_constructor (tree);
116 static unsigned min_align (unsigned, unsigned);
117 static void globalize_decl (tree);
118 #ifdef BSS_SECTION_ASM_OP
119 #ifdef ASM_OUTPUT_BSS
120 static void asm_output_bss (FILE *, tree, const char *,
121 unsigned HOST_WIDE_INT, unsigned HOST_WIDE_INT);
123 #ifdef ASM_OUTPUT_ALIGNED_BSS
124 static void asm_output_aligned_bss (FILE *, tree, const char *,
125 unsigned HOST_WIDE_INT, int)
128 #endif /* BSS_SECTION_ASM_OP */
129 static void mark_weak (tree);
130 static void output_constant_pool (const char *, tree);
132 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
133 section *text_section;
134 section *data_section;
135 section *readonly_data_section;
136 section *sdata_section;
137 section *ctors_section;
138 section *dtors_section;
139 section *bss_section;
140 section *sbss_section;
142 /* Various forms of common section. All are guaranteed to be nonnull. */
143 section *tls_comm_section;
144 section *comm_section;
145 section *lcomm_section;
147 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
149 section *bss_noswitch_section;
151 /* The section that holds the main exception table, when known. The section
152 is set either by the target's init_sections hook or by the first call to
153 switch_to_exception_section. */
154 section *exception_section;
156 /* The section that holds the DWARF2 frame unwind information, when known.
157 The section is set either by the target's init_sections hook or by the
158 first call to switch_to_eh_frame_section. */
159 section *eh_frame_section;
161 /* asm_out_file's current section. This is NULL if no section has yet
162 been selected or if we lose track of what the current section is. */
165 /* True if code for the current function is currently being directed
166 at the cold section. */
167 bool in_cold_section_p;
169 /* A linked list of all the unnamed sections. */
170 static GTY(()) section *unnamed_sections;
172 /* Return a nonzero value if DECL has a section attribute. */
173 #ifndef IN_NAMED_SECTION
174 #define IN_NAMED_SECTION(DECL) \
175 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
176 && DECL_SECTION_NAME (DECL) != NULL_TREE)
179 /* Hash table of named sections. */
180 static GTY((param_is (section))) htab_t section_htab;
182 /* A table of object_blocks, indexed by section. */
183 static GTY((param_is (struct object_block))) htab_t object_block_htab;
185 /* The next number to use for internal anchor labels. */
186 static GTY(()) int anchor_labelno;
188 /* A pool of constants that can be shared between functions. */
189 static GTY(()) struct rtx_constant_pool *shared_constant_pool;
193 static GTY ((if_marked ("tree_map_marked_p"), param_is (struct tree_map)))
195 static GTY (()) tree emutls_object_type;
196 /* Emulated TLS objects have the TLS model TLS_MODEL_EMULATED. This
197 macro can be used on them to distinguish the control variable from
198 the initialization template. */
199 #define DECL_EMUTLS_VAR_P(D) (TREE_TYPE (D) == emutls_object_type)
201 #if !defined (NO_DOT_IN_LABEL)
202 # define EMUTLS_SEPARATOR "."
203 #elif !defined (NO_DOLLAR_IN_LABEL)
204 # define EMUTLS_SEPARATOR "$"
206 # define EMUTLS_SEPARATOR "_"
209 /* Create an IDENTIFIER_NODE by prefixing PREFIX to the
210 IDENTIFIER_NODE NAME's name. */
213 prefix_name (const char *prefix, tree name)
215 unsigned plen = strlen (prefix);
216 unsigned nlen = strlen (IDENTIFIER_POINTER (name));
217 char *toname = (char *) alloca (plen + nlen + 1);
219 memcpy (toname, prefix, plen);
220 memcpy (toname + plen, IDENTIFIER_POINTER (name), nlen + 1);
222 return get_identifier (toname);
225 /* Create an identifier for the struct __emutls_object, given an identifier
226 of the DECL_ASSEMBLY_NAME of the original object. */
229 get_emutls_object_name (tree name)
231 const char *prefix = (targetm.emutls.var_prefix
232 ? targetm.emutls.var_prefix
233 : "__emutls_v" EMUTLS_SEPARATOR);
234 return prefix_name (prefix, name);
238 default_emutls_var_fields (tree type, tree *name ATTRIBUTE_UNUSED)
240 tree word_type_node, field, next_field;
242 field = build_decl (UNKNOWN_LOCATION,
243 FIELD_DECL, get_identifier ("__templ"), ptr_type_node);
244 DECL_CONTEXT (field) = type;
247 field = build_decl (UNKNOWN_LOCATION,
248 FIELD_DECL, get_identifier ("__offset"),
250 DECL_CONTEXT (field) = type;
251 TREE_CHAIN (field) = next_field;
254 word_type_node = lang_hooks.types.type_for_mode (word_mode, 1);
255 field = build_decl (UNKNOWN_LOCATION,
256 FIELD_DECL, get_identifier ("__align"),
258 DECL_CONTEXT (field) = type;
259 TREE_CHAIN (field) = next_field;
262 field = build_decl (UNKNOWN_LOCATION,
263 FIELD_DECL, get_identifier ("__size"), word_type_node);
264 DECL_CONTEXT (field) = type;
265 TREE_CHAIN (field) = next_field;
270 /* Create the structure for struct __emutls_object. This should match the
271 structure at the top of emutls.c, modulo the union there. */
274 get_emutls_object_type (void)
276 tree type, type_name, field;
278 type = emutls_object_type;
282 emutls_object_type = type = lang_hooks.types.make_type (RECORD_TYPE);
284 field = targetm.emutls.var_fields (type, &type_name);
286 type_name = get_identifier ("__emutls_object");
287 type_name = build_decl (UNKNOWN_LOCATION,
288 TYPE_DECL, type_name, type);
289 TYPE_NAME (type) = type_name;
290 TYPE_FIELDS (type) = field;
296 /* Create a read-only variable like DECL, with the same DECL_INITIAL.
297 This will be used for initializing the emulated tls data area. */
300 get_emutls_init_templ_addr (tree decl)
304 if (targetm.emutls.register_common && !DECL_INITIAL (decl)
305 && !DECL_SECTION_NAME (decl))
306 return null_pointer_node;
308 name = DECL_ASSEMBLER_NAME (decl);
309 if (!targetm.emutls.tmpl_prefix || targetm.emutls.tmpl_prefix[0])
311 const char *prefix = (targetm.emutls.tmpl_prefix
312 ? targetm.emutls.tmpl_prefix
313 : "__emutls_t" EMUTLS_SEPARATOR);
314 name = prefix_name (prefix, name);
317 to = build_decl (DECL_SOURCE_LOCATION (decl),
318 VAR_DECL, name, TREE_TYPE (decl));
319 SET_DECL_ASSEMBLER_NAME (to, DECL_NAME (to));
320 DECL_TLS_MODEL (to) = TLS_MODEL_EMULATED;
321 DECL_ARTIFICIAL (to) = 1;
322 TREE_USED (to) = TREE_USED (decl);
323 TREE_READONLY (to) = 1;
324 DECL_IGNORED_P (to) = 1;
325 DECL_CONTEXT (to) = DECL_CONTEXT (decl);
326 DECL_SECTION_NAME (to) = DECL_SECTION_NAME (decl);
328 DECL_WEAK (to) = DECL_WEAK (decl);
329 if (DECL_ONE_ONLY (decl))
331 make_decl_one_only (to, DECL_ASSEMBLER_NAME (to));
332 TREE_STATIC (to) = TREE_STATIC (decl);
333 TREE_PUBLIC (to) = TREE_PUBLIC (decl);
334 DECL_VISIBILITY (to) = DECL_VISIBILITY (decl);
337 TREE_STATIC (to) = 1;
339 DECL_INITIAL (to) = DECL_INITIAL (decl);
340 DECL_INITIAL (decl) = NULL;
342 varpool_finalize_decl (to);
343 return build_fold_addr_expr (to);
346 /* When emulating tls, we use a control structure for use by the runtime.
347 Create and return this structure. */
350 emutls_decl (tree decl)
353 struct tree_map *h, in;
356 if (targetm.have_tls || decl == NULL || decl == error_mark_node
357 || TREE_CODE (decl) != VAR_DECL || ! DECL_THREAD_LOCAL_P (decl))
360 /* Look up the object in the hash; return the control structure if
361 it has already been created. */
363 emutls_htab = htab_create_ggc (512, tree_map_hash, tree_map_eq, 0);
365 name = DECL_ASSEMBLER_NAME (decl);
367 /* Note that we use the hash of the decl's name, rather than a hash
368 of the decl's pointer. In emutls_finish we iterate through the
369 hash table, and we want this traversal to be predictable. */
370 in.hash = htab_hash_string (IDENTIFIER_POINTER (name));
372 loc = htab_find_slot_with_hash (emutls_htab, &in, in.hash, INSERT);
373 h = (struct tree_map *) *loc;
378 to = build_decl (DECL_SOURCE_LOCATION (decl),
379 VAR_DECL, get_emutls_object_name (name),
380 get_emutls_object_type ());
382 h = GGC_NEW (struct tree_map);
386 *(struct tree_map **) loc = h;
388 DECL_TLS_MODEL (to) = TLS_MODEL_EMULATED;
389 DECL_ARTIFICIAL (to) = 1;
390 DECL_IGNORED_P (to) = 1;
391 TREE_READONLY (to) = 0;
392 SET_DECL_ASSEMBLER_NAME (to, DECL_NAME (to));
393 if (DECL_ONE_ONLY (decl))
394 make_decl_one_only (to, DECL_ASSEMBLER_NAME (to));
395 DECL_CONTEXT (to) = DECL_CONTEXT (decl);
396 if (targetm.emutls.var_align_fixed)
397 /* If we're not allowed to change the proxy object's
398 alignment, pretend it's been set by the user. */
399 DECL_USER_ALIGN (to) = 1;
402 /* Note that these fields may need to be updated from time to time from
403 the original decl. Consider:
404 extern __thread int i;
405 int foo() { return i; }
407 in which I goes from external to locally defined and initialized. */
409 TREE_STATIC (to) = TREE_STATIC (decl);
410 TREE_USED (to) = TREE_USED (decl);
411 TREE_PUBLIC (to) = TREE_PUBLIC (decl);
412 DECL_EXTERNAL (to) = DECL_EXTERNAL (decl);
413 DECL_COMMON (to) = DECL_COMMON (decl);
414 DECL_WEAK (to) = DECL_WEAK (decl);
415 DECL_VISIBILITY (to) = DECL_VISIBILITY (decl);
421 emutls_common_1 (void **loc, void *xstmts)
423 struct tree_map *h = *(struct tree_map **) loc;
424 tree args, x, *pstmts = (tree *) xstmts;
427 if (! DECL_COMMON (h->base.from)
428 || (DECL_INITIAL (h->base.from)
429 && DECL_INITIAL (h->base.from) != error_mark_node))
432 word_type_node = lang_hooks.types.type_for_mode (word_mode, 1);
434 /* The idea was to call get_emutls_init_templ_addr here, but if we
435 do this and there is an initializer, -fanchor_section loses,
436 because it would be too late to ensure the template is
438 x = null_pointer_node;
439 args = tree_cons (NULL, x, NULL);
440 x = build_int_cst (word_type_node, DECL_ALIGN_UNIT (h->base.from));
441 args = tree_cons (NULL, x, args);
442 x = fold_convert (word_type_node, DECL_SIZE_UNIT (h->base.from));
443 args = tree_cons (NULL, x, args);
444 x = build_fold_addr_expr (h->to);
445 args = tree_cons (NULL, x, args);
447 x = built_in_decls[BUILT_IN_EMUTLS_REGISTER_COMMON];
448 x = build_function_call_expr (UNKNOWN_LOCATION, x, args);
450 append_to_statement_list (x, pstmts);
457 if (targetm.emutls.register_common)
459 tree body = NULL_TREE;
461 if (emutls_htab == NULL)
464 htab_traverse_noresize (emutls_htab, emutls_common_1, &body);
465 if (body == NULL_TREE)
468 cgraph_build_static_cdtor ('I', body, DEFAULT_INIT_PRIORITY);
472 /* Helper routines for maintaining section_htab. */
475 section_entry_eq (const void *p1, const void *p2)
477 const section *old = (const section *) p1;
478 const char *new_name = (const char *) p2;
480 return strcmp (old->named.name, new_name) == 0;
484 section_entry_hash (const void *p)
486 const section *old = (const section *) p;
487 return htab_hash_string (old->named.name);
490 /* Return a hash value for section SECT. */
493 hash_section (section *sect)
495 if (sect->common.flags & SECTION_NAMED)
496 return htab_hash_string (sect->named.name);
497 return sect->common.flags;
500 /* Helper routines for maintaining object_block_htab. */
503 object_block_entry_eq (const void *p1, const void *p2)
505 const struct object_block *old = (const struct object_block *) p1;
506 const section *new_section = (const section *) p2;
508 return old->sect == new_section;
512 object_block_entry_hash (const void *p)
514 const struct object_block *old = (const struct object_block *) p;
515 return hash_section (old->sect);
518 /* Return a new unnamed section with the given fields. */
521 get_unnamed_section (unsigned int flags, void (*callback) (const void *),
526 sect = GGC_NEW (section);
527 sect->unnamed.common.flags = flags | SECTION_UNNAMED;
528 sect->unnamed.callback = callback;
529 sect->unnamed.data = data;
530 sect->unnamed.next = unnamed_sections;
532 unnamed_sections = sect;
536 /* Return a SECTION_NOSWITCH section with the given fields. */
539 get_noswitch_section (unsigned int flags, noswitch_section_callback callback)
543 sect = GGC_NEW (section);
544 sect->noswitch.common.flags = flags | SECTION_NOSWITCH;
545 sect->noswitch.callback = callback;
550 /* Return the named section structure associated with NAME. Create
551 a new section with the given fields if no such structure exists. */
554 get_section (const char *name, unsigned int flags, tree decl)
556 section *sect, **slot;
559 htab_find_slot_with_hash (section_htab, name,
560 htab_hash_string (name), INSERT);
561 flags |= SECTION_NAMED;
564 sect = GGC_NEW (section);
565 sect->named.common.flags = flags;
566 sect->named.name = ggc_strdup (name);
567 sect->named.decl = decl;
573 if ((sect->common.flags & ~SECTION_DECLARED) != flags
574 && ((sect->common.flags | flags) & SECTION_OVERRIDE) == 0)
576 /* Sanity check user variables for flag changes. */
578 decl = sect->named.decl;
580 error ("%+D causes a section type conflict", decl);
586 /* Return true if the current compilation mode benefits from having
587 objects grouped into blocks. */
590 use_object_blocks_p (void)
592 return flag_section_anchors;
595 /* Return the object_block structure for section SECT. Create a new
596 structure if we haven't created one already. Return null if SECT
599 static struct object_block *
600 get_block_for_section (section *sect)
602 struct object_block *block;
608 slot = htab_find_slot_with_hash (object_block_htab, sect,
609 hash_section (sect), INSERT);
610 block = (struct object_block *) *slot;
613 block = (struct object_block *)
614 ggc_alloc_cleared (sizeof (struct object_block));
621 /* Create a symbol with label LABEL and place it at byte offset
622 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
623 is not yet known. LABEL must be a garbage-collected string. */
626 create_block_symbol (const char *label, struct object_block *block,
627 HOST_WIDE_INT offset)
632 /* Create the extended SYMBOL_REF. */
633 size = RTX_HDR_SIZE + sizeof (struct block_symbol);
634 symbol = (rtx) ggc_alloc_zone (size, &rtl_zone);
636 /* Initialize the normal SYMBOL_REF fields. */
637 memset (symbol, 0, size);
638 PUT_CODE (symbol, SYMBOL_REF);
639 PUT_MODE (symbol, Pmode);
640 XSTR (symbol, 0) = label;
641 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_HAS_BLOCK_INFO;
643 /* Initialize the block_symbol stuff. */
644 SYMBOL_REF_BLOCK (symbol) = block;
645 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
651 initialize_cold_section_name (void)
653 const char *stripped_name;
657 gcc_assert (cfun && current_function_decl);
658 if (crtl->subsections.unlikely_text_section_name)
661 dsn = DECL_SECTION_NAME (current_function_decl);
662 if (flag_function_sections && dsn)
664 name = (char *) alloca (TREE_STRING_LENGTH (dsn) + 1);
665 memcpy (name, TREE_STRING_POINTER (dsn), TREE_STRING_LENGTH (dsn) + 1);
667 stripped_name = targetm.strip_name_encoding (name);
669 buffer = ACONCAT ((stripped_name, "_unlikely", NULL));
670 crtl->subsections.unlikely_text_section_name = ggc_strdup (buffer);
673 crtl->subsections.unlikely_text_section_name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
676 /* Tell assembler to switch to unlikely-to-be-executed text section. */
679 unlikely_text_section (void)
683 if (!crtl->subsections.unlikely_text_section_name)
684 initialize_cold_section_name ();
686 return get_named_section (NULL, crtl->subsections.unlikely_text_section_name, 0);
689 return get_named_section (NULL, UNLIKELY_EXECUTED_TEXT_SECTION_NAME, 0);
692 /* When called within a function context, return true if the function
693 has been assigned a cold text section and if SECT is that section.
694 When called outside a function context, return true if SECT is the
695 default cold section. */
698 unlikely_text_section_p (section *sect)
703 name = crtl->subsections.unlikely_text_section_name;
705 name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
709 && SECTION_STYLE (sect) == SECTION_NAMED
710 && strcmp (name, sect->named.name) == 0);
713 /* Return a section with a particular name and with whatever SECTION_*
714 flags section_type_flags deems appropriate. The name of the section
715 is taken from NAME if nonnull, otherwise it is taken from DECL's
716 DECL_SECTION_NAME. DECL is the decl associated with the section
717 (see the section comment for details) and RELOC is as for
718 section_type_flags. */
721 get_named_section (tree decl, const char *name, int reloc)
725 gcc_assert (!decl || DECL_P (decl));
727 name = TREE_STRING_POINTER (DECL_SECTION_NAME (decl));
729 flags = targetm.section_type_flags (decl, name, reloc);
731 return get_section (name, flags, decl);
734 /* If required, set DECL_SECTION_NAME to a unique name. */
737 resolve_unique_section (tree decl, int reloc ATTRIBUTE_UNUSED,
738 int flag_function_or_data_sections)
740 if (DECL_SECTION_NAME (decl) == NULL_TREE
741 && targetm.have_named_sections
742 && (flag_function_or_data_sections
743 || DECL_ONE_ONLY (decl)))
744 targetm.asm_out.unique_section (decl, reloc);
747 #ifdef BSS_SECTION_ASM_OP
749 #ifdef ASM_OUTPUT_BSS
751 /* Utility function for ASM_OUTPUT_BSS for targets to use if
752 they don't support alignments in .bss.
753 ??? It is believed that this function will work in most cases so such
754 support is localized here. */
757 asm_output_bss (FILE *file, tree decl ATTRIBUTE_UNUSED,
759 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
760 unsigned HOST_WIDE_INT rounded)
762 gcc_assert (strcmp (XSTR (XEXP (DECL_RTL (decl), 0), 0), name) == 0);
763 targetm.asm_out.globalize_decl_name (file, decl);
764 switch_to_section (bss_section);
765 #ifdef ASM_DECLARE_OBJECT_NAME
766 last_assemble_variable_decl = decl;
767 ASM_DECLARE_OBJECT_NAME (file, name, decl);
769 /* Standard thing is just output label for the object. */
770 ASM_OUTPUT_LABEL (file, name);
771 #endif /* ASM_DECLARE_OBJECT_NAME */
772 ASM_OUTPUT_SKIP (file, rounded ? rounded : 1);
777 #ifdef ASM_OUTPUT_ALIGNED_BSS
779 /* Utility function for targets to use in implementing
780 ASM_OUTPUT_ALIGNED_BSS.
781 ??? It is believed that this function will work in most cases so such
782 support is localized here. */
785 asm_output_aligned_bss (FILE *file, tree decl ATTRIBUTE_UNUSED,
786 const char *name, unsigned HOST_WIDE_INT size,
789 switch_to_section (bss_section);
790 ASM_OUTPUT_ALIGN (file, floor_log2 (align / BITS_PER_UNIT));
791 #ifdef ASM_DECLARE_OBJECT_NAME
792 last_assemble_variable_decl = decl;
793 ASM_DECLARE_OBJECT_NAME (file, name, decl);
795 /* Standard thing is just output label for the object. */
796 ASM_OUTPUT_LABEL (file, name);
797 #endif /* ASM_DECLARE_OBJECT_NAME */
798 ASM_OUTPUT_SKIP (file, size ? size : 1);
803 #endif /* BSS_SECTION_ASM_OP */
805 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
806 /* Return the hot section for function DECL. Return text_section for
810 hot_function_section (tree decl)
812 if (decl != NULL_TREE
813 && DECL_SECTION_NAME (decl) != NULL_TREE
814 && targetm.have_named_sections)
815 return get_named_section (decl, NULL, 0);
821 /* Return the section for function DECL.
823 If DECL is NULL_TREE, return the text section. We can be passed
824 NULL_TREE under some circumstances by dbxout.c at least. */
827 function_section (tree decl)
831 if (first_function_block_is_cold)
834 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
835 if (decl != NULL_TREE
836 && DECL_SECTION_NAME (decl) != NULL_TREE)
837 return reloc ? unlikely_text_section ()
838 : get_named_section (decl, NULL, 0);
840 return targetm.asm_out.select_section (decl, reloc, DECL_ALIGN (decl));
842 return reloc ? unlikely_text_section () : hot_function_section (decl);
847 current_function_section (void)
849 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
850 if (current_function_decl != NULL_TREE
851 && DECL_SECTION_NAME (current_function_decl) != NULL_TREE)
852 return in_cold_section_p ? unlikely_text_section ()
853 : get_named_section (current_function_decl,
856 return targetm.asm_out.select_section (current_function_decl,
858 DECL_ALIGN (current_function_decl));
860 return (in_cold_section_p
861 ? unlikely_text_section ()
862 : hot_function_section (current_function_decl));
866 /* Return the read-only data section associated with function DECL. */
869 default_function_rodata_section (tree decl)
871 if (decl != NULL_TREE && DECL_SECTION_NAME (decl))
873 const char *name = TREE_STRING_POINTER (DECL_SECTION_NAME (decl));
875 if (DECL_ONE_ONLY (decl) && HAVE_COMDAT_GROUP)
881 dot = strchr (name + 1, '.');
884 len = strlen (dot) + 8;
885 rname = (char *) alloca (len);
887 strcpy (rname, ".rodata");
889 return get_section (rname, SECTION_LINKONCE, decl);
891 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
892 else if (DECL_ONE_ONLY (decl)
893 && strncmp (name, ".gnu.linkonce.t.", 16) == 0)
895 size_t len = strlen (name) + 1;
896 char *rname = (char *) alloca (len);
898 memcpy (rname, name, len);
900 return get_section (rname, SECTION_LINKONCE, decl);
902 /* For .text.foo we want to use .rodata.foo. */
903 else if (flag_function_sections && flag_data_sections
904 && strncmp (name, ".text.", 6) == 0)
906 size_t len = strlen (name) + 1;
907 char *rname = (char *) alloca (len + 2);
909 memcpy (rname, ".rodata", 7);
910 memcpy (rname + 7, name + 5, len - 5);
911 return get_section (rname, 0, decl);
915 return readonly_data_section;
918 /* Return the read-only data section associated with function DECL
919 for targets where that section should be always the single
920 readonly data section. */
923 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED)
925 return readonly_data_section;
928 /* Return the section to use for string merging. */
931 mergeable_string_section (tree decl ATTRIBUTE_UNUSED,
932 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
933 unsigned int flags ATTRIBUTE_UNUSED)
937 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
938 && TREE_CODE (decl) == STRING_CST
939 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
941 && (len = int_size_in_bytes (TREE_TYPE (decl))) > 0
942 && TREE_STRING_LENGTH (decl) >= len)
944 enum machine_mode mode;
945 unsigned int modesize;
951 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (decl)));
952 modesize = GET_MODE_BITSIZE (mode);
953 if (modesize >= 8 && modesize <= 256
954 && (modesize & (modesize - 1)) == 0)
956 if (align < modesize)
959 str = TREE_STRING_POINTER (decl);
960 unit = GET_MODE_SIZE (mode);
962 /* Check for embedded NUL characters. */
963 for (i = 0; i < len; i += unit)
965 for (j = 0; j < unit; j++)
966 if (str[i + j] != '\0')
973 sprintf (name, ".rodata.str%d.%d", modesize / 8,
975 flags |= (modesize / 8) | SECTION_MERGE | SECTION_STRINGS;
976 return get_section (name, flags, NULL);
981 return readonly_data_section;
984 /* Return the section to use for constant merging. */
987 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED,
988 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
989 unsigned int flags ATTRIBUTE_UNUSED)
991 unsigned int modesize = GET_MODE_BITSIZE (mode);
993 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
999 && (align & (align - 1)) == 0)
1003 sprintf (name, ".rodata.cst%d", (int) (align / 8));
1004 flags |= (align / 8) | SECTION_MERGE;
1005 return get_section (name, flags, NULL);
1007 return readonly_data_section;
1010 /* Given NAME, a putative register name, discard any customary prefixes. */
1013 strip_reg_name (const char *name)
1015 #ifdef REGISTER_PREFIX
1016 if (!strncmp (name, REGISTER_PREFIX, strlen (REGISTER_PREFIX)))
1017 name += strlen (REGISTER_PREFIX);
1019 if (name[0] == '%' || name[0] == '#')
1024 /* The user has asked for a DECL to have a particular name. Set (or
1025 change) it in such a way that we don't prefix an underscore to
1028 set_user_assembler_name (tree decl, const char *name)
1030 char *starred = (char *) alloca (strlen (name) + 2);
1032 strcpy (starred + 1, name);
1033 change_decl_assembler_name (decl, get_identifier (starred));
1034 SET_DECL_RTL (decl, NULL_RTX);
1037 /* Decode an `asm' spec for a declaration as a register name.
1038 Return the register number, or -1 if nothing specified,
1039 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
1040 or -3 if ASMSPEC is `cc' and is not recognized,
1041 or -4 if ASMSPEC is `memory' and is not recognized.
1042 Accept an exact spelling or a decimal number.
1043 Prefixes such as % are optional. */
1046 decode_reg_name (const char *asmspec)
1052 /* Get rid of confusing prefixes. */
1053 asmspec = strip_reg_name (asmspec);
1055 /* Allow a decimal number as a "register name". */
1056 for (i = strlen (asmspec) - 1; i >= 0; i--)
1057 if (! ISDIGIT (asmspec[i]))
1059 if (asmspec[0] != 0 && i < 0)
1062 if (i < FIRST_PSEUDO_REGISTER && i >= 0)
1068 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
1070 && ! strcmp (asmspec, strip_reg_name (reg_names[i])))
1073 #ifdef ADDITIONAL_REGISTER_NAMES
1075 static const struct { const char *const name; const int number; } table[]
1076 = ADDITIONAL_REGISTER_NAMES;
1078 for (i = 0; i < (int) ARRAY_SIZE (table); i++)
1079 if (table[i].name[0]
1080 && ! strcmp (asmspec, table[i].name))
1081 return table[i].number;
1083 #endif /* ADDITIONAL_REGISTER_NAMES */
1085 if (!strcmp (asmspec, "memory"))
1088 if (!strcmp (asmspec, "cc"))
1097 /* Return true if DECL's initializer is suitable for a BSS section. */
1100 bss_initializer_p (const_tree decl)
1102 return (DECL_INITIAL (decl) == NULL
1103 || DECL_INITIAL (decl) == error_mark_node
1104 || (flag_zero_initialized_in_bss
1105 /* Leave constant zeroes in .rodata so they
1107 && !TREE_READONLY (decl)
1108 && initializer_zerop (DECL_INITIAL (decl))));
1111 /* Compute the alignment of variable specified by DECL.
1112 DONT_OUTPUT_DATA is from assemble_variable. */
1115 align_variable (tree decl, bool dont_output_data)
1117 unsigned int align = DECL_ALIGN (decl);
1119 /* In the case for initialing an array whose length isn't specified,
1120 where we have not yet been able to do the layout,
1121 figure out the proper alignment now. */
1122 if (dont_output_data && DECL_SIZE (decl) == 0
1123 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
1124 align = MAX (align, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl))));
1126 /* Some object file formats have a maximum alignment which they support.
1127 In particular, a.out format supports a maximum alignment of 4. */
1128 if (align > MAX_OFILE_ALIGNMENT)
1130 warning (0, "alignment of %q+D is greater than maximum object "
1131 "file alignment. Using %d", decl,
1132 MAX_OFILE_ALIGNMENT/BITS_PER_UNIT);
1133 align = MAX_OFILE_ALIGNMENT;
1136 /* On some machines, it is good to increase alignment sometimes. */
1137 if (! DECL_USER_ALIGN (decl))
1139 #ifdef DATA_ALIGNMENT
1140 unsigned int data_align = DATA_ALIGNMENT (TREE_TYPE (decl), align);
1141 /* Don't increase alignment too much for TLS variables - TLS space
1143 if (! DECL_THREAD_LOCAL_P (decl) || data_align <= BITS_PER_WORD)
1146 #ifdef CONSTANT_ALIGNMENT
1147 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
1149 unsigned int const_align = CONSTANT_ALIGNMENT (DECL_INITIAL (decl),
1151 /* Don't increase alignment too much for TLS variables - TLS space
1153 if (! DECL_THREAD_LOCAL_P (decl) || const_align <= BITS_PER_WORD)
1154 align = const_align;
1159 /* Reset the alignment in case we have made it tighter, so we can benefit
1160 from it in get_pointer_alignment. */
1161 DECL_ALIGN (decl) = align;
1164 /* Return the section into which the given VAR_DECL or CONST_DECL
1165 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1166 section should be used wherever possible. */
1169 get_variable_section (tree decl, bool prefer_noswitch_p)
1171 addr_space_t as = ADDR_SPACE_GENERIC;
1174 if (TREE_TYPE (decl) != error_mark_node)
1175 as = TYPE_ADDR_SPACE (TREE_TYPE (decl));
1177 if (DECL_COMMON (decl))
1179 /* If the decl has been given an explicit section name, or it resides
1180 in a non-generic address space, then it isn't common, and shouldn't
1181 be handled as such. */
1182 gcc_assert (DECL_SECTION_NAME (decl) == NULL
1183 && ADDR_SPACE_GENERIC_P (as));
1184 if (DECL_THREAD_LOCAL_P (decl))
1185 return tls_comm_section;
1186 /* This cannot be common bss for an emulated TLS object without
1187 a register_common hook. */
1188 else if (DECL_TLS_MODEL (decl) == TLS_MODEL_EMULATED
1189 && !targetm.emutls.register_common)
1191 else if (TREE_PUBLIC (decl) && bss_initializer_p (decl))
1192 return comm_section;
1195 if (DECL_INITIAL (decl) == error_mark_node)
1196 reloc = contains_pointers_p (TREE_TYPE (decl)) ? 3 : 0;
1197 else if (DECL_INITIAL (decl))
1198 reloc = compute_reloc_for_constant (DECL_INITIAL (decl));
1202 resolve_unique_section (decl, reloc, flag_data_sections);
1203 if (IN_NAMED_SECTION (decl))
1204 return get_named_section (decl, NULL, reloc);
1206 if (ADDR_SPACE_GENERIC_P (as)
1207 && !DECL_THREAD_LOCAL_P (decl)
1208 && !(prefer_noswitch_p && targetm.have_switchable_bss_sections)
1209 && bss_initializer_p (decl))
1211 if (!TREE_PUBLIC (decl))
1212 return lcomm_section;
1213 if (bss_noswitch_section)
1214 return bss_noswitch_section;
1217 return targetm.asm_out.select_section (decl, reloc, DECL_ALIGN (decl));
1220 /* Return the block into which object_block DECL should be placed. */
1222 static struct object_block *
1223 get_block_for_decl (tree decl)
1227 if (TREE_CODE (decl) == VAR_DECL)
1229 /* The object must be defined in this translation unit. */
1230 if (DECL_EXTERNAL (decl))
1233 /* There's no point using object blocks for something that is
1234 isolated by definition. */
1235 if (DECL_ONE_ONLY (decl))
1239 /* We can only calculate block offsets if the decl has a known
1241 if (DECL_SIZE_UNIT (decl) == NULL)
1243 if (!host_integerp (DECL_SIZE_UNIT (decl), 1))
1246 /* Find out which section should contain DECL. We cannot put it into
1247 an object block if it requires a standalone definition. */
1248 if (TREE_CODE (decl) == VAR_DECL)
1249 align_variable (decl, 0);
1250 sect = get_variable_section (decl, true);
1251 if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
1254 return get_block_for_section (sect);
1257 /* Make sure block symbol SYMBOL is in block BLOCK. */
1260 change_symbol_block (rtx symbol, struct object_block *block)
1262 if (block != SYMBOL_REF_BLOCK (symbol))
1264 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol) < 0);
1265 SYMBOL_REF_BLOCK (symbol) = block;
1269 /* Return true if it is possible to put DECL in an object_block. */
1272 use_blocks_for_decl_p (tree decl)
1274 /* Only data DECLs can be placed into object blocks. */
1275 if (TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != CONST_DECL)
1278 /* Detect decls created by dw2_force_const_mem. Such decls are
1279 special because DECL_INITIAL doesn't specify the decl's true value.
1280 dw2_output_indirect_constants will instead call assemble_variable
1281 with dont_output_data set to 1 and then print the contents itself. */
1282 if (DECL_INITIAL (decl) == decl)
1285 /* If this decl is an alias, then we don't want to emit a definition. */
1286 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl)))
1292 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1293 have static storage duration. In other words, it should not be an
1294 automatic variable, including PARM_DECLs.
1296 There is, however, one exception: this function handles variables
1297 explicitly placed in a particular register by the user.
1299 This is never called for PARM_DECL nodes. */
1302 make_decl_rtl (tree decl)
1304 const char *name = 0;
1308 /* Check that we are not being given an automatic variable. */
1309 gcc_assert (TREE_CODE (decl) != PARM_DECL
1310 && TREE_CODE (decl) != RESULT_DECL);
1312 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1313 gcc_assert (TREE_CODE (decl) != VAR_DECL
1314 || TREE_STATIC (decl)
1315 || TREE_PUBLIC (decl)
1316 || DECL_EXTERNAL (decl)
1317 || DECL_REGISTER (decl));
1319 /* And that we were not given a type or a label. */
1320 gcc_assert (TREE_CODE (decl) != TYPE_DECL
1321 && TREE_CODE (decl) != LABEL_DECL);
1323 /* For a duplicate declaration, we can be called twice on the
1324 same DECL node. Don't discard the RTL already made. */
1325 if (DECL_RTL_SET_P (decl))
1327 /* If the old RTL had the wrong mode, fix the mode. */
1328 x = DECL_RTL (decl);
1329 if (GET_MODE (x) != DECL_MODE (decl))
1330 SET_DECL_RTL (decl, adjust_address_nv (x, DECL_MODE (decl), 0));
1332 if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1335 /* ??? Another way to do this would be to maintain a hashed
1336 table of such critters. Instead of adding stuff to a DECL
1337 to give certain attributes to it, we could use an external
1338 hash map from DECL to set of attributes. */
1340 /* Let the target reassign the RTL if it wants.
1341 This is necessary, for example, when one machine specific
1342 decl attribute overrides another. */
1343 targetm.encode_section_info (decl, DECL_RTL (decl), false);
1345 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1346 on the new decl information. */
1348 && GET_CODE (XEXP (x, 0)) == SYMBOL_REF
1349 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x, 0)))
1350 change_symbol_block (XEXP (x, 0), get_block_for_decl (decl));
1352 /* Make this function static known to the mudflap runtime. */
1353 if (flag_mudflap && TREE_CODE (decl) == VAR_DECL)
1354 mudflap_enqueue_decl (decl);
1359 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
1361 if (name[0] != '*' && TREE_CODE (decl) != FUNCTION_DECL
1362 && DECL_REGISTER (decl))
1364 error ("register name not specified for %q+D", decl);
1366 else if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1368 const char *asmspec = name+1;
1369 reg_number = decode_reg_name (asmspec);
1370 /* First detect errors in declaring global registers. */
1371 if (reg_number == -1)
1372 error ("register name not specified for %q+D", decl);
1373 else if (reg_number < 0)
1374 error ("invalid register name for %q+D", decl);
1375 else if (TYPE_MODE (TREE_TYPE (decl)) == BLKmode)
1376 error ("data type of %q+D isn%'t suitable for a register",
1378 else if (! HARD_REGNO_MODE_OK (reg_number, TYPE_MODE (TREE_TYPE (decl))))
1379 error ("register specified for %q+D isn%'t suitable for data type",
1381 /* Now handle properly declared static register variables. */
1386 if (DECL_INITIAL (decl) != 0 && TREE_STATIC (decl))
1388 DECL_INITIAL (decl) = 0;
1389 error ("global register variable has initial value");
1391 if (TREE_THIS_VOLATILE (decl))
1392 warning (OPT_Wvolatile_register_var,
1393 "optimization may eliminate reads and/or "
1394 "writes to register variables");
1396 /* If the user specified one of the eliminables registers here,
1397 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1398 confused with that register and be eliminated. This usage is
1399 somewhat suspect... */
1401 SET_DECL_RTL (decl, gen_rtx_raw_REG (DECL_MODE (decl), reg_number));
1402 ORIGINAL_REGNO (DECL_RTL (decl)) = reg_number;
1403 REG_USERVAR_P (DECL_RTL (decl)) = 1;
1405 if (TREE_STATIC (decl))
1407 /* Make this register global, so not usable for anything
1409 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1410 name = IDENTIFIER_POINTER (DECL_NAME (decl));
1411 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file, decl, reg_number, name);
1413 nregs = hard_regno_nregs[reg_number][DECL_MODE (decl)];
1415 globalize_reg (reg_number + --nregs);
1418 /* As a register variable, it has no section. */
1422 /* Now handle ordinary static variables and functions (in memory).
1423 Also handle vars declared register invalidly. */
1424 else if (name[0] == '*')
1426 #ifdef REGISTER_PREFIX
1427 if (strlen (REGISTER_PREFIX) != 0)
1429 reg_number = decode_reg_name (name);
1430 if (reg_number >= 0 || reg_number == -3)
1431 error ("register name given for non-register variable %q+D", decl);
1436 /* Specifying a section attribute on a variable forces it into a
1437 non-.bss section, and thus it cannot be common. */
1438 gcc_assert (!(TREE_CODE (decl) == VAR_DECL
1439 && DECL_SECTION_NAME (decl) != NULL_TREE
1440 && DECL_INITIAL (decl) == NULL_TREE
1441 && DECL_COMMON (decl))
1442 || !DECL_COMMON (decl));
1444 /* Variables can't be both common and weak. */
1445 gcc_assert (TREE_CODE (decl) != VAR_DECL
1446 || !DECL_WEAK (decl)
1447 || !DECL_COMMON (decl));
1449 if (use_object_blocks_p () && use_blocks_for_decl_p (decl))
1450 x = create_block_symbol (name, get_block_for_decl (decl), -1);
1453 enum machine_mode address_mode = Pmode;
1454 if (TREE_TYPE (decl) != error_mark_node)
1456 addr_space_t as = TYPE_ADDR_SPACE (TREE_TYPE (decl));
1457 address_mode = targetm.addr_space.address_mode (as);
1459 x = gen_rtx_SYMBOL_REF (address_mode, name);
1461 SYMBOL_REF_WEAK (x) = DECL_WEAK (decl);
1462 SET_SYMBOL_REF_DECL (x, decl);
1464 x = gen_rtx_MEM (DECL_MODE (decl), x);
1465 if (TREE_CODE (decl) != FUNCTION_DECL)
1466 set_mem_attributes (x, decl, 1);
1467 SET_DECL_RTL (decl, x);
1469 /* Optionally set flags or add text to the name to record information
1470 such as that it is a function name.
1471 If the name is changed, the macro ASM_OUTPUT_LABELREF
1472 will have to know how to strip this information. */
1473 targetm.encode_section_info (decl, DECL_RTL (decl), true);
1475 /* Make this function static known to the mudflap runtime. */
1476 if (flag_mudflap && TREE_CODE (decl) == VAR_DECL)
1477 mudflap_enqueue_decl (decl);
1480 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1481 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1485 make_decl_rtl_for_debug (tree decl)
1487 unsigned int save_aliasing_flag;
1490 if (DECL_RTL_SET_P (decl))
1491 return DECL_RTL (decl);
1493 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1494 call new_alias_set. If running with -fcompare-debug, sometimes
1495 we do not want to create alias sets that will throw the alias
1496 numbers off in the comparison dumps. So... clearing
1497 flag_strict_aliasing will keep new_alias_set() from creating a
1499 save_aliasing_flag = flag_strict_aliasing;
1500 flag_strict_aliasing = 0;
1502 rtl = DECL_RTL (decl);
1503 /* Reset DECL_RTL back, as various parts of the compiler expects
1504 DECL_RTL set meaning it is actually going to be output. */
1505 SET_DECL_RTL (decl, NULL);
1507 flag_strict_aliasing = save_aliasing_flag;
1512 /* Output a string of literal assembler code
1513 for an `asm' keyword used between functions. */
1516 assemble_asm (tree string)
1520 if (TREE_CODE (string) == ADDR_EXPR)
1521 string = TREE_OPERAND (string, 0);
1523 fprintf (asm_out_file, "\t%s\n", TREE_STRING_POINTER (string));
1526 /* Record an element in the table of global destructors. SYMBOL is
1527 a SYMBOL_REF of the function to be called; PRIORITY is a number
1528 between 0 and MAX_INIT_PRIORITY. */
1531 default_stabs_asm_out_destructor (rtx symbol ATTRIBUTE_UNUSED,
1532 int priority ATTRIBUTE_UNUSED)
1534 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1535 /* Tell GNU LD that this is part of the static destructor set.
1536 This will work for any system that uses stabs, most usefully
1538 dbxout_begin_simple_stabs ("___DTOR_LIST__", 22 /* N_SETT */);
1539 dbxout_stab_value_label (XSTR (symbol, 0));
1541 sorry ("global destructors not supported on this target");
1545 /* Write the address of the entity given by SYMBOL to SEC. */
1547 assemble_addr_to_section (rtx symbol, section *sec)
1549 switch_to_section (sec);
1550 assemble_align (POINTER_SIZE);
1551 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1554 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1555 not) section for PRIORITY. */
1557 get_cdtor_priority_section (int priority, bool constructor_p)
1561 /* ??? This only works reliably with the GNU linker. */
1562 sprintf (buf, "%s.%.5u",
1563 constructor_p ? ".ctors" : ".dtors",
1564 /* Invert the numbering so the linker puts us in the proper
1565 order; constructors are run from right to left, and the
1566 linker sorts in increasing order. */
1567 MAX_INIT_PRIORITY - priority);
1568 return get_section (buf, SECTION_WRITE, NULL);
1572 default_named_section_asm_out_destructor (rtx symbol, int priority)
1576 if (priority != DEFAULT_INIT_PRIORITY)
1577 sec = get_cdtor_priority_section (priority,
1578 /*constructor_p=*/false);
1580 sec = get_section (".dtors", SECTION_WRITE, NULL);
1582 assemble_addr_to_section (symbol, sec);
1585 #ifdef DTORS_SECTION_ASM_OP
1587 default_dtor_section_asm_out_destructor (rtx symbol,
1588 int priority ATTRIBUTE_UNUSED)
1590 assemble_addr_to_section (symbol, dtors_section);
1594 /* Likewise for global constructors. */
1597 default_stabs_asm_out_constructor (rtx symbol ATTRIBUTE_UNUSED,
1598 int priority ATTRIBUTE_UNUSED)
1600 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1601 /* Tell GNU LD that this is part of the static destructor set.
1602 This will work for any system that uses stabs, most usefully
1604 dbxout_begin_simple_stabs ("___CTOR_LIST__", 22 /* N_SETT */);
1605 dbxout_stab_value_label (XSTR (symbol, 0));
1607 sorry ("global constructors not supported on this target");
1612 default_named_section_asm_out_constructor (rtx symbol, int priority)
1616 if (priority != DEFAULT_INIT_PRIORITY)
1617 sec = get_cdtor_priority_section (priority,
1618 /*constructor_p=*/true);
1620 sec = get_section (".ctors", SECTION_WRITE, NULL);
1622 assemble_addr_to_section (symbol, sec);
1625 #ifdef CTORS_SECTION_ASM_OP
1627 default_ctor_section_asm_out_constructor (rtx symbol,
1628 int priority ATTRIBUTE_UNUSED)
1630 assemble_addr_to_section (symbol, ctors_section);
1634 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1635 a nonzero value if the constant pool should be output before the
1636 start of the function, or a zero value if the pool should output
1637 after the end of the function. The default is to put it before the
1640 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1641 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1644 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1645 to be output to assembler.
1646 Set first_global_object_name and weak_global_object_name as appropriate. */
1649 notice_global_symbol (tree decl)
1651 const char **type = &first_global_object_name;
1653 if (first_global_object_name
1654 || !TREE_PUBLIC (decl)
1655 || DECL_EXTERNAL (decl)
1656 || !DECL_NAME (decl)
1657 || (TREE_CODE (decl) != FUNCTION_DECL
1658 && (TREE_CODE (decl) != VAR_DECL
1659 || (DECL_COMMON (decl)
1660 && (DECL_INITIAL (decl) == 0
1661 || DECL_INITIAL (decl) == error_mark_node))))
1662 || !MEM_P (DECL_RTL (decl)))
1665 /* We win when global object is found, but it is useful to know about weak
1666 symbol as well so we can produce nicer unique names. */
1667 if (DECL_WEAK (decl) || DECL_ONE_ONLY (decl) || flag_shlib)
1668 type = &weak_global_object_name;
1674 rtx decl_rtl = DECL_RTL (decl);
1676 p = targetm.strip_name_encoding (XSTR (XEXP (decl_rtl, 0), 0));
1677 name = ggc_strdup (p);
1683 /* Output assembler code for the constant pool of a function and associated
1684 with defining the name of the function. DECL describes the function.
1685 NAME is the function's name. For the constant pool, we use the current
1686 constant pool data. */
1689 assemble_start_function (tree decl, const char *fnname)
1692 char tmp_label[100];
1693 bool hot_label_written = false;
1695 crtl->subsections.unlikely_text_section_name = NULL;
1697 first_function_block_is_cold = false;
1698 if (flag_reorder_blocks_and_partition)
1700 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTB", const_labelno);
1701 crtl->subsections.hot_section_label = ggc_strdup (tmp_label);
1702 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDB", const_labelno);
1703 crtl->subsections.cold_section_label = ggc_strdup (tmp_label);
1704 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTE", const_labelno);
1705 crtl->subsections.hot_section_end_label = ggc_strdup (tmp_label);
1706 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDE", const_labelno);
1707 crtl->subsections.cold_section_end_label = ggc_strdup (tmp_label);
1712 crtl->subsections.hot_section_label = NULL;
1713 crtl->subsections.cold_section_label = NULL;
1714 crtl->subsections.hot_section_end_label = NULL;
1715 crtl->subsections.cold_section_end_label = NULL;
1718 /* The following code does not need preprocessing in the assembler. */
1722 if (CONSTANT_POOL_BEFORE_FUNCTION)
1723 output_constant_pool (fnname, decl);
1725 resolve_unique_section (decl, 0, flag_function_sections);
1727 /* Make sure the not and cold text (code) sections are properly
1728 aligned. This is necessary here in the case where the function
1729 has both hot and cold sections, because we don't want to re-set
1730 the alignment when the section switch happens mid-function. */
1732 if (flag_reorder_blocks_and_partition)
1734 switch_to_section (unlikely_text_section ());
1735 assemble_align (DECL_ALIGN (decl));
1736 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.cold_section_label);
1738 /* When the function starts with a cold section, we need to explicitly
1739 align the hot section and write out the hot section label.
1740 But if the current function is a thunk, we do not have a CFG. */
1742 && BB_PARTITION (ENTRY_BLOCK_PTR->next_bb) == BB_COLD_PARTITION)
1744 switch_to_section (text_section);
1745 assemble_align (DECL_ALIGN (decl));
1746 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_label);
1747 hot_label_written = true;
1748 first_function_block_is_cold = true;
1751 else if (DECL_SECTION_NAME (decl))
1753 /* Calls to function_section rely on first_function_block_is_cold
1754 being accurate. The first block may be cold even if we aren't
1755 doing partitioning, if the entire function was decided by
1756 choose_function_section (predict.c) to be cold. */
1758 initialize_cold_section_name ();
1760 if (crtl->subsections.unlikely_text_section_name
1761 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)),
1762 crtl->subsections.unlikely_text_section_name) == 0)
1763 first_function_block_is_cold = true;
1766 in_cold_section_p = first_function_block_is_cold;
1768 /* Switch to the correct text section for the start of the function. */
1770 switch_to_section (function_section (decl));
1771 if (flag_reorder_blocks_and_partition
1772 && !hot_label_written)
1773 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_label);
1775 /* Tell assembler to move to target machine's alignment for functions. */
1776 align = floor_log2 (DECL_ALIGN (decl) / BITS_PER_UNIT);
1779 ASM_OUTPUT_ALIGN (asm_out_file, align);
1782 /* Handle a user-specified function alignment.
1783 Note that we still need to align to DECL_ALIGN, as above,
1784 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1785 if (! DECL_USER_ALIGN (decl)
1786 && align_functions_log > align
1787 && optimize_function_for_speed_p (cfun))
1789 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1790 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file,
1791 align_functions_log, align_functions - 1);
1793 ASM_OUTPUT_ALIGN (asm_out_file, align_functions_log);
1797 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1798 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file, fnname);
1801 if (!DECL_IGNORED_P (decl))
1802 (*debug_hooks->begin_function) (decl);
1804 /* Make function name accessible from other files, if appropriate. */
1806 if (TREE_PUBLIC (decl))
1808 notice_global_symbol (decl);
1810 globalize_decl (decl);
1812 maybe_assemble_visibility (decl);
1815 if (DECL_PRESERVE_P (decl))
1816 targetm.asm_out.mark_decl_preserved (fnname);
1818 /* Do any machine/system dependent processing of the function name. */
1819 #ifdef ASM_DECLARE_FUNCTION_NAME
1820 ASM_DECLARE_FUNCTION_NAME (asm_out_file, fnname, current_function_decl);
1822 /* Standard thing is just output label for the function. */
1823 ASM_OUTPUT_LABEL (asm_out_file, fnname);
1824 #endif /* ASM_DECLARE_FUNCTION_NAME */
1827 /* Output assembler code associated with defining the size of the
1828 function. DECL describes the function. NAME is the function's name. */
1831 assemble_end_function (tree decl, const char *fnname ATTRIBUTE_UNUSED)
1833 #ifdef ASM_DECLARE_FUNCTION_SIZE
1834 /* We could have switched section in the middle of the function. */
1835 if (flag_reorder_blocks_and_partition)
1836 switch_to_section (function_section (decl));
1837 ASM_DECLARE_FUNCTION_SIZE (asm_out_file, fnname, decl);
1839 if (! CONSTANT_POOL_BEFORE_FUNCTION)
1841 output_constant_pool (fnname, decl);
1842 switch_to_section (function_section (decl)); /* need to switch back */
1844 /* Output labels for end of hot/cold text sections (to be used by
1846 if (flag_reorder_blocks_and_partition)
1848 section *save_text_section;
1850 save_text_section = in_section;
1851 switch_to_section (unlikely_text_section ());
1852 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.cold_section_end_label);
1853 if (first_function_block_is_cold)
1854 switch_to_section (text_section);
1856 switch_to_section (function_section (decl));
1857 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_end_label);
1858 switch_to_section (save_text_section);
1862 /* Assemble code to leave SIZE bytes of zeros. */
1865 assemble_zeros (unsigned HOST_WIDE_INT size)
1867 /* Do no output if -fsyntax-only. */
1868 if (flag_syntax_only)
1871 #ifdef ASM_NO_SKIP_IN_TEXT
1872 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1873 so we must output 0s explicitly in the text section. */
1874 if (ASM_NO_SKIP_IN_TEXT && (in_section->common.flags & SECTION_CODE) != 0)
1876 unsigned HOST_WIDE_INT i;
1877 for (i = 0; i < size; i++)
1878 assemble_integer (const0_rtx, 1, BITS_PER_UNIT, 1);
1883 ASM_OUTPUT_SKIP (asm_out_file, size);
1886 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1889 assemble_align (int align)
1891 if (align > BITS_PER_UNIT)
1893 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
1897 /* Assemble a string constant with the specified C string as contents. */
1900 assemble_string (const char *p, int size)
1905 /* If the string is very long, split it up. */
1909 int thissize = size - pos;
1910 if (thissize > maximum)
1913 ASM_OUTPUT_ASCII (asm_out_file, p, thissize);
1921 /* A noswitch_section_callback for lcomm_section. */
1924 emit_local (tree decl ATTRIBUTE_UNUSED,
1925 const char *name ATTRIBUTE_UNUSED,
1926 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1927 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1929 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1930 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, decl, name,
1931 size, DECL_ALIGN (decl));
1933 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1934 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, DECL_ALIGN (decl));
1937 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
1942 /* A noswitch_section_callback for bss_noswitch_section. */
1944 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
1946 emit_bss (tree decl ATTRIBUTE_UNUSED,
1947 const char *name ATTRIBUTE_UNUSED,
1948 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1949 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1951 #if defined ASM_OUTPUT_ALIGNED_BSS
1952 ASM_OUTPUT_ALIGNED_BSS (asm_out_file, decl, name, size, DECL_ALIGN (decl));
1955 ASM_OUTPUT_BSS (asm_out_file, decl, name, size, rounded);
1961 /* A noswitch_section_callback for comm_section. */
1964 emit_common (tree decl ATTRIBUTE_UNUSED,
1965 const char *name ATTRIBUTE_UNUSED,
1966 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1967 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1969 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1970 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, decl, name,
1971 size, DECL_ALIGN (decl));
1973 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1974 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, name, size, DECL_ALIGN (decl));
1977 ASM_OUTPUT_COMMON (asm_out_file, name, size, rounded);
1982 /* A noswitch_section_callback for tls_comm_section. */
1985 emit_tls_common (tree decl ATTRIBUTE_UNUSED,
1986 const char *name ATTRIBUTE_UNUSED,
1987 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1988 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1990 #ifdef ASM_OUTPUT_TLS_COMMON
1991 ASM_OUTPUT_TLS_COMMON (asm_out_file, decl, name, size);
1994 sorry ("thread-local COMMON data not implemented");
1999 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
2000 NAME is the name of DECL's SYMBOL_REF. */
2003 assemble_noswitch_variable (tree decl, const char *name, section *sect)
2005 unsigned HOST_WIDE_INT size, rounded;
2007 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
2010 /* Don't allocate zero bytes of common,
2011 since that means "undefined external" in the linker. */
2015 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2016 so that each uninitialized object starts on such a boundary. */
2017 rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1;
2018 rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
2019 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
2021 if (!sect->noswitch.callback (decl, name, size, rounded)
2022 && (unsigned HOST_WIDE_INT) DECL_ALIGN_UNIT (decl) > rounded)
2023 warning (0, "requested alignment for %q+D is greater than "
2024 "implemented alignment of %wu", decl, rounded);
2027 /* A subroutine of assemble_variable. Output the label and contents of
2028 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
2029 is as for assemble_variable. */
2032 assemble_variable_contents (tree decl, const char *name,
2033 bool dont_output_data)
2035 /* Do any machine/system dependent processing of the object. */
2036 #ifdef ASM_DECLARE_OBJECT_NAME
2037 last_assemble_variable_decl = decl;
2038 ASM_DECLARE_OBJECT_NAME (asm_out_file, name, decl);
2040 /* Standard thing is just output label for the object. */
2041 ASM_OUTPUT_LABEL (asm_out_file, name);
2042 #endif /* ASM_DECLARE_OBJECT_NAME */
2044 if (!dont_output_data)
2046 if (DECL_INITIAL (decl)
2047 && DECL_INITIAL (decl) != error_mark_node
2048 && !initializer_zerop (DECL_INITIAL (decl)))
2049 /* Output the actual data. */
2050 output_constant (DECL_INITIAL (decl),
2051 tree_low_cst (DECL_SIZE_UNIT (decl), 1),
2054 /* Leave space for it. */
2055 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl), 1));
2059 /* Initialize emulated tls object TO, which refers to TLS variable
2060 DECL and is initialized by PROXY. */
2063 default_emutls_var_init (tree to, tree decl, tree proxy)
2065 VEC(constructor_elt,gc) *v = VEC_alloc (constructor_elt, gc, 4);
2066 constructor_elt *elt;
2067 tree type = TREE_TYPE (to);
2068 tree field = TYPE_FIELDS (type);
2070 elt = VEC_quick_push (constructor_elt, v, NULL);
2072 elt->value = fold_convert (TREE_TYPE (field), DECL_SIZE_UNIT (decl));
2074 elt = VEC_quick_push (constructor_elt, v, NULL);
2075 field = TREE_CHAIN (field);
2077 elt->value = build_int_cst (TREE_TYPE (field),
2078 DECL_ALIGN_UNIT (decl));
2080 elt = VEC_quick_push (constructor_elt, v, NULL);
2081 field = TREE_CHAIN (field);
2083 elt->value = null_pointer_node;
2085 elt = VEC_quick_push (constructor_elt, v, NULL);
2086 field = TREE_CHAIN (field);
2090 return build_constructor (type, v);
2093 /* Assemble everything that is needed for a variable or function declaration.
2094 Not used for automatic variables, and not used for function definitions.
2095 Should not be called for variables of incomplete structure type.
2097 TOP_LEVEL is nonzero if this variable has file scope.
2098 AT_END is nonzero if this is the special handling, at end of compilation,
2099 to define things that have had only tentative definitions.
2100 DONT_OUTPUT_DATA if nonzero means don't actually output the
2101 initial value (that will be done by the caller). */
2104 assemble_variable (tree decl, int top_level ATTRIBUTE_UNUSED,
2105 int at_end ATTRIBUTE_UNUSED, int dont_output_data)
2108 rtx decl_rtl, symbol;
2111 if (! targetm.have_tls
2112 && TREE_CODE (decl) == VAR_DECL
2113 && DECL_THREAD_LOCAL_P (decl))
2115 tree to = emutls_decl (decl);
2117 /* If this variable is defined locally, then we need to initialize the
2118 control structure with size and alignment information. We do this
2119 at the last moment because tentative definitions can take a locally
2120 defined but uninitialized variable and initialize it later, which
2121 would result in incorrect contents. */
2122 if (! DECL_EXTERNAL (to)
2123 && (! DECL_COMMON (to)
2124 || (DECL_INITIAL (decl)
2125 && DECL_INITIAL (decl) != error_mark_node)))
2127 DECL_INITIAL (to) = targetm.emutls.var_init
2128 (to, decl, get_emutls_init_templ_addr (decl));
2130 /* Make sure the template is marked as needed early enough.
2131 Without this, if the variable is placed in a
2132 section-anchored block, the template will only be marked
2133 when it's too late. */
2134 record_references_in_initializer (to, false);
2140 last_assemble_variable_decl = 0;
2142 /* Normally no need to say anything here for external references,
2143 since assemble_external is called by the language-specific code
2144 when a declaration is first seen. */
2146 if (DECL_EXTERNAL (decl))
2149 /* Output no assembler code for a function declaration.
2150 Only definitions of functions output anything. */
2152 if (TREE_CODE (decl) == FUNCTION_DECL)
2155 /* Do nothing for global register variables. */
2156 if (DECL_RTL_SET_P (decl) && REG_P (DECL_RTL (decl)))
2158 TREE_ASM_WRITTEN (decl) = 1;
2162 /* If type was incomplete when the variable was declared,
2163 see if it is complete now. */
2165 if (DECL_SIZE (decl) == 0)
2166 layout_decl (decl, 0);
2168 /* Still incomplete => don't allocate it; treat the tentative defn
2169 (which is what it must have been) as an `extern' reference. */
2171 if (!dont_output_data && DECL_SIZE (decl) == 0)
2173 error ("storage size of %q+D isn%'t known", decl);
2174 TREE_ASM_WRITTEN (decl) = 1;
2178 /* The first declaration of a variable that comes through this function
2179 decides whether it is global (in C, has external linkage)
2180 or local (in C, has internal linkage). So do nothing more
2181 if this function has already run. */
2183 if (TREE_ASM_WRITTEN (decl))
2186 /* Make sure targetm.encode_section_info is invoked before we set
2188 decl_rtl = DECL_RTL (decl);
2190 TREE_ASM_WRITTEN (decl) = 1;
2192 /* Do no output if -fsyntax-only. */
2193 if (flag_syntax_only)
2198 if (! dont_output_data
2199 && ! host_integerp (DECL_SIZE_UNIT (decl), 1))
2201 error ("size of variable %q+D is too large", decl);
2205 gcc_assert (MEM_P (decl_rtl));
2206 gcc_assert (GET_CODE (XEXP (decl_rtl, 0)) == SYMBOL_REF);
2207 symbol = XEXP (decl_rtl, 0);
2208 name = XSTR (symbol, 0);
2209 if (TREE_PUBLIC (decl) && DECL_NAME (decl))
2210 notice_global_symbol (decl);
2212 /* Compute the alignment of this data. */
2214 align_variable (decl, dont_output_data);
2215 set_mem_align (decl_rtl, DECL_ALIGN (decl));
2217 if (TREE_PUBLIC (decl))
2218 maybe_assemble_visibility (decl);
2220 if (DECL_PRESERVE_P (decl))
2221 targetm.asm_out.mark_decl_preserved (name);
2223 /* First make the assembler name(s) global if appropriate. */
2224 sect = get_variable_section (decl, false);
2225 if (TREE_PUBLIC (decl)
2226 && (sect->common.flags & SECTION_COMMON) == 0)
2227 globalize_decl (decl);
2229 /* Output any data that we will need to use the address of. */
2230 if (DECL_INITIAL (decl) && DECL_INITIAL (decl) != error_mark_node)
2231 output_addressed_constants (DECL_INITIAL (decl));
2233 /* dbxout.c needs to know this. */
2234 if (sect && (sect->common.flags & SECTION_CODE) != 0)
2235 DECL_IN_TEXT_SECTION (decl) = 1;
2237 /* If the decl is part of an object_block, make sure that the decl
2238 has been positioned within its block, but do not write out its
2239 definition yet. output_object_blocks will do that later. */
2240 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
2242 gcc_assert (!dont_output_data);
2243 place_block_symbol (symbol);
2245 else if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
2246 assemble_noswitch_variable (decl, name, sect);
2249 switch_to_section (sect);
2250 if (DECL_ALIGN (decl) > BITS_PER_UNIT)
2251 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (DECL_ALIGN_UNIT (decl)));
2252 assemble_variable_contents (decl, name, dont_output_data);
2256 /* Return 1 if type TYPE contains any pointers. */
2259 contains_pointers_p (tree type)
2261 switch (TREE_CODE (type))
2264 case REFERENCE_TYPE:
2265 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2266 so I'll play safe and return 1. */
2272 case QUAL_UNION_TYPE:
2275 /* For a type that has fields, see if the fields have pointers. */
2276 for (fields = TYPE_FIELDS (type); fields; fields = TREE_CHAIN (fields))
2277 if (TREE_CODE (fields) == FIELD_DECL
2278 && contains_pointers_p (TREE_TYPE (fields)))
2284 /* An array type contains pointers if its element type does. */
2285 return contains_pointers_p (TREE_TYPE (type));
2292 /* We delay assemble_external processing until
2293 the compilation unit is finalized. This is the best we can do for
2294 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2295 it all the way to final. See PR 17982 for further discussion. */
2296 static GTY(()) tree pending_assemble_externals;
2298 #ifdef ASM_OUTPUT_EXTERNAL
2299 /* True if DECL is a function decl for which no out-of-line copy exists.
2300 It is assumed that DECL's assembler name has been set. */
2303 incorporeal_function_p (tree decl)
2305 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
2309 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL
2310 && DECL_FUNCTION_CODE (decl) == BUILT_IN_ALLOCA)
2313 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
2314 if (is_builtin_name (name))
2320 /* Actually do the tests to determine if this is necessary, and invoke
2321 ASM_OUTPUT_EXTERNAL. */
2323 assemble_external_real (tree decl)
2325 rtx rtl = DECL_RTL (decl);
2327 if (MEM_P (rtl) && GET_CODE (XEXP (rtl, 0)) == SYMBOL_REF
2328 && !SYMBOL_REF_USED (XEXP (rtl, 0))
2329 && !incorporeal_function_p (decl))
2331 /* Some systems do require some output. */
2332 SYMBOL_REF_USED (XEXP (rtl, 0)) = 1;
2333 ASM_OUTPUT_EXTERNAL (asm_out_file, decl, XSTR (XEXP (rtl, 0), 0));
2339 process_pending_assemble_externals (void)
2341 #ifdef ASM_OUTPUT_EXTERNAL
2343 for (list = pending_assemble_externals; list; list = TREE_CHAIN (list))
2344 assemble_external_real (TREE_VALUE (list));
2346 pending_assemble_externals = 0;
2350 /* This TREE_LIST contains any weak symbol declarations waiting
2352 static GTY(()) tree weak_decls;
2354 /* Output something to declare an external symbol to the assembler,
2355 and qualifiers such as weakness. (Most assemblers don't need
2356 extern declaration, so we normally output nothing.) Do nothing if
2357 DECL is not external. */
2360 assemble_external (tree decl ATTRIBUTE_UNUSED)
2362 /* Because most platforms do not define ASM_OUTPUT_EXTERNAL, the
2363 main body of this code is only rarely exercised. To provide some
2364 testing, on all platforms, we make sure that the ASM_OUT_FILE is
2365 open. If it's not, we should not be calling this function. */
2366 gcc_assert (asm_out_file);
2368 if (!DECL_P (decl) || !DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl))
2371 /* We want to output annotation for weak and external symbols at
2372 very last to check if they are references or not. */
2376 /* TREE_STATIC is a weird and abused creature which is not
2377 generally the right test for whether an entity has been
2378 locally emitted, inlined or otherwise not-really-extern, but
2379 for declarations that can be weak, it happens to be
2381 && !TREE_STATIC (decl)
2382 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl))
2383 && value_member (decl, weak_decls) == NULL_TREE)
2384 weak_decls = tree_cons (NULL, decl, weak_decls);
2386 #ifdef ASM_OUTPUT_EXTERNAL
2387 if (value_member (decl, pending_assemble_externals) == NULL_TREE)
2388 pending_assemble_externals = tree_cons (NULL, decl,
2389 pending_assemble_externals);
2393 /* Similar, for calling a library function FUN. */
2396 assemble_external_libcall (rtx fun)
2398 /* Declare library function name external when first used, if nec. */
2399 if (! SYMBOL_REF_USED (fun))
2401 SYMBOL_REF_USED (fun) = 1;
2402 targetm.asm_out.external_libcall (fun);
2406 /* Assemble a label named NAME. */
2409 assemble_label (const char *name)
2411 ASM_OUTPUT_LABEL (asm_out_file, name);
2414 /* Set the symbol_referenced flag for ID. */
2416 mark_referenced (tree id)
2418 TREE_SYMBOL_REFERENCED (id) = 1;
2421 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2423 mark_decl_referenced (tree decl)
2425 if (TREE_CODE (decl) == FUNCTION_DECL)
2427 /* Extern inline functions don't become needed when referenced.
2428 If we know a method will be emitted in other TU and no new
2429 functions can be marked reachable, just use the external
2431 struct cgraph_node *node = cgraph_node (decl);
2432 if (!DECL_EXTERNAL (decl)
2433 && (!node->local.vtable_method || !cgraph_global_info_ready
2434 || !node->local.finalized))
2435 cgraph_mark_needed_node (node);
2437 else if (TREE_CODE (decl) == VAR_DECL)
2439 struct varpool_node *node = varpool_node (decl);
2440 varpool_mark_needed_node (node);
2441 /* C++ frontend use mark_decl_references to force COMDAT variables
2442 to be output that might appear dead otherwise. */
2443 node->force_output = true;
2445 /* else do nothing - we can get various sorts of CST nodes here,
2446 which do not need to be marked. */
2450 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2451 until we find an identifier that is not itself a transparent alias.
2452 Modify the alias passed to it by reference (and all aliases on the
2453 way to the ultimate target), such that they do not have to be
2454 followed again, and return the ultimate target of the alias
2458 ultimate_transparent_alias_target (tree *alias)
2460 tree target = *alias;
2462 if (IDENTIFIER_TRANSPARENT_ALIAS (target))
2464 gcc_assert (TREE_CHAIN (target));
2465 target = ultimate_transparent_alias_target (&TREE_CHAIN (target));
2466 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target)
2467 && ! TREE_CHAIN (target));
2474 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2475 starts with a *, the rest of NAME is output verbatim. Otherwise
2476 NAME is transformed in a target-specific way (usually by the
2477 addition of an underscore). */
2480 assemble_name_raw (FILE *file, const char *name)
2483 fputs (&name[1], file);
2485 ASM_OUTPUT_LABELREF (file, name);
2488 /* Like assemble_name_raw, but should be used when NAME might refer to
2489 an entity that is also represented as a tree (like a function or
2490 variable). If NAME does refer to such an entity, that entity will
2491 be marked as referenced. */
2494 assemble_name (FILE *file, const char *name)
2496 const char *real_name;
2499 real_name = targetm.strip_name_encoding (name);
2501 id = maybe_get_identifier (real_name);
2506 mark_referenced (id);
2507 ultimate_transparent_alias_target (&id);
2509 name = IDENTIFIER_POINTER (id);
2510 gcc_assert (! TREE_CHAIN (id));
2513 assemble_name_raw (file, name);
2516 /* Allocate SIZE bytes writable static space with a gensym name
2517 and return an RTX to refer to its address. */
2520 assemble_static_space (unsigned HOST_WIDE_INT size)
2523 const char *namestring;
2526 ASM_GENERATE_INTERNAL_LABEL (name, "LF", const_labelno);
2528 namestring = ggc_strdup (name);
2530 x = gen_rtx_SYMBOL_REF (Pmode, namestring);
2531 SYMBOL_REF_FLAGS (x) = SYMBOL_FLAG_LOCAL;
2533 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2534 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, NULL_TREE, name, size,
2537 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2538 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, BIGGEST_ALIGNMENT);
2541 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2542 so that each uninitialized object starts on such a boundary. */
2543 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2544 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2545 = ((size + (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1)
2546 / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
2547 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
2548 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
2555 /* Assemble the static constant template for function entry trampolines.
2556 This is done at most once per compilation.
2557 Returns an RTX for the address of the template. */
2559 static GTY(()) rtx initial_trampoline;
2562 assemble_trampoline_template (void)
2569 gcc_assert (targetm.asm_out.trampoline_template != NULL);
2571 if (initial_trampoline)
2572 return initial_trampoline;
2574 /* By default, put trampoline templates in read-only data section. */
2576 #ifdef TRAMPOLINE_SECTION
2577 switch_to_section (TRAMPOLINE_SECTION);
2579 switch_to_section (readonly_data_section);
2582 /* Write the assembler code to define one. */
2583 align = floor_log2 (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT);
2585 ASM_OUTPUT_ALIGN (asm_out_file, align);
2587 targetm.asm_out.internal_label (asm_out_file, "LTRAMP", 0);
2588 targetm.asm_out.trampoline_template (asm_out_file);
2590 /* Record the rtl to refer to it. */
2591 ASM_GENERATE_INTERNAL_LABEL (label, "LTRAMP", 0);
2592 name = ggc_strdup (label);
2593 symbol = gen_rtx_SYMBOL_REF (Pmode, name);
2594 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_LOCAL;
2596 initial_trampoline = gen_const_mem (BLKmode, symbol);
2597 set_mem_align (initial_trampoline, TRAMPOLINE_ALIGNMENT);
2598 set_mem_size (initial_trampoline, GEN_INT (TRAMPOLINE_SIZE));
2600 return initial_trampoline;
2603 /* A and B are either alignments or offsets. Return the minimum alignment
2604 that may be assumed after adding the two together. */
2606 static inline unsigned
2607 min_align (unsigned int a, unsigned int b)
2609 return (a | b) & -(a | b);
2612 /* Return the assembler directive for creating a given kind of integer
2613 object. SIZE is the number of bytes in the object and ALIGNED_P
2614 indicates whether it is known to be aligned. Return NULL if the
2615 assembly dialect has no such directive.
2617 The returned string should be printed at the start of a new line and
2618 be followed immediately by the object's initial value. */
2621 integer_asm_op (int size, int aligned_p)
2623 struct asm_int_op *ops;
2626 ops = &targetm.asm_out.aligned_op;
2628 ops = &targetm.asm_out.unaligned_op;
2633 return targetm.asm_out.byte_op;
2647 /* Use directive OP to assemble an integer object X. Print OP at the
2648 start of the line, followed immediately by the value of X. */
2651 assemble_integer_with_op (const char *op, rtx x)
2653 fputs (op, asm_out_file);
2654 output_addr_const (asm_out_file, x);
2655 fputc ('\n', asm_out_file);
2658 /* The default implementation of the asm_out.integer target hook. */
2661 default_assemble_integer (rtx x ATTRIBUTE_UNUSED,
2662 unsigned int size ATTRIBUTE_UNUSED,
2663 int aligned_p ATTRIBUTE_UNUSED)
2665 const char *op = integer_asm_op (size, aligned_p);
2666 /* Avoid GAS bugs for large values. Specifically negative values whose
2667 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2668 if (size > UNITS_PER_WORD && size > POINTER_SIZE / BITS_PER_UNIT)
2670 return op && (assemble_integer_with_op (op, x), true);
2673 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2674 the alignment of the integer in bits. Return 1 if we were able to output
2675 the constant, otherwise 0. We must be able to output the constant,
2676 if FORCE is nonzero. */
2679 assemble_integer (rtx x, unsigned int size, unsigned int align, int force)
2683 aligned_p = (align >= MIN (size * BITS_PER_UNIT, BIGGEST_ALIGNMENT));
2685 /* See if the target hook can handle this kind of object. */
2686 if (targetm.asm_out.integer (x, size, aligned_p))
2689 /* If the object is a multi-byte one, try splitting it up. Split
2690 it into words it if is multi-word, otherwise split it into bytes. */
2693 enum machine_mode omode, imode;
2694 unsigned int subalign;
2695 unsigned int subsize, i;
2696 enum mode_class mclass;
2698 subsize = size > UNITS_PER_WORD? UNITS_PER_WORD : 1;
2699 subalign = MIN (align, subsize * BITS_PER_UNIT);
2700 if (GET_CODE (x) == CONST_FIXED)
2701 mclass = GET_MODE_CLASS (GET_MODE (x));
2705 omode = mode_for_size (subsize * BITS_PER_UNIT, mclass, 0);
2706 imode = mode_for_size (size * BITS_PER_UNIT, mclass, 0);
2708 for (i = 0; i < size; i += subsize)
2710 rtx partial = simplify_subreg (omode, x, imode, i);
2711 if (!partial || !assemble_integer (partial, subsize, subalign, 0))
2717 /* If we've printed some of it, but not all of it, there's no going
2722 gcc_assert (!force);
2728 assemble_real (REAL_VALUE_TYPE d, enum machine_mode mode, unsigned int align)
2730 long data[4] = {0, 0, 0, 0};
2732 int bitsize, nelts, nunits, units_per;
2734 /* This is hairy. We have a quantity of known size. real_to_target
2735 will put it into an array of *host* longs, 32 bits per element
2736 (even if long is more than 32 bits). We need to determine the
2737 number of array elements that are occupied (nelts) and the number
2738 of *target* min-addressable units that will be occupied in the
2739 object file (nunits). We cannot assume that 32 divides the
2740 mode's bitsize (size * BITS_PER_UNIT) evenly.
2742 size * BITS_PER_UNIT is used here to make sure that padding bits
2743 (which might appear at either end of the value; real_to_target
2744 will include the padding bits in its output array) are included. */
2746 nunits = GET_MODE_SIZE (mode);
2747 bitsize = nunits * BITS_PER_UNIT;
2748 nelts = CEIL (bitsize, 32);
2749 units_per = 32 / BITS_PER_UNIT;
2751 real_to_target (data, &d, mode);
2753 /* Put out the first word with the specified alignment. */
2754 assemble_integer (GEN_INT (data[0]), MIN (nunits, units_per), align, 1);
2755 nunits -= units_per;
2757 /* Subsequent words need only 32-bit alignment. */
2758 align = min_align (align, 32);
2760 for (i = 1; i < nelts; i++)
2762 assemble_integer (GEN_INT (data[i]), MIN (nunits, units_per), align, 1);
2763 nunits -= units_per;
2767 /* Given an expression EXP with a constant value,
2768 reduce it to the sum of an assembler symbol and an integer.
2769 Store them both in the structure *VALUE.
2770 EXP must be reducible. */
2772 struct GTY(()) addr_const {
2774 HOST_WIDE_INT offset;
2778 decode_addr_const (tree exp, struct addr_const *value)
2780 tree target = TREE_OPERAND (exp, 0);
2786 if (TREE_CODE (target) == COMPONENT_REF
2787 && host_integerp (byte_position (TREE_OPERAND (target, 1)), 0))
2790 offset += int_byte_position (TREE_OPERAND (target, 1));
2791 target = TREE_OPERAND (target, 0);
2793 else if (TREE_CODE (target) == ARRAY_REF
2794 || TREE_CODE (target) == ARRAY_RANGE_REF)
2796 offset += (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target)), 1)
2797 * tree_low_cst (TREE_OPERAND (target, 1), 0));
2798 target = TREE_OPERAND (target, 0);
2804 switch (TREE_CODE (target))
2808 x = DECL_RTL (target);
2812 x = gen_rtx_MEM (FUNCTION_MODE,
2813 gen_rtx_LABEL_REF (Pmode, force_label_rtx (target)));
2822 x = output_constant_def (target, 1);
2829 gcc_assert (MEM_P (x));
2833 value->offset = offset;
2837 static GTY((param_is (struct constant_descriptor_tree)))
2838 htab_t const_desc_htab;
2840 static struct constant_descriptor_tree * build_constant_desc (tree);
2841 static void maybe_output_constant_def_contents (struct constant_descriptor_tree *, int);
2843 /* Constant pool accessor function. */
2846 constant_pool_htab (void)
2848 return const_desc_htab;
2851 /* Compute a hash code for a constant expression. */
2854 const_desc_hash (const void *ptr)
2856 return ((const struct constant_descriptor_tree *)ptr)->hash;
2860 const_hash_1 (const tree exp)
2865 enum tree_code code = TREE_CODE (exp);
2867 /* Either set P and LEN to the address and len of something to hash and
2868 exit the switch or return a value. */
2873 p = (char *) &TREE_INT_CST (exp);
2874 len = sizeof TREE_INT_CST (exp);
2878 return real_hash (TREE_REAL_CST_PTR (exp));
2881 return fixed_hash (TREE_FIXED_CST_PTR (exp));
2884 p = TREE_STRING_POINTER (exp);
2885 len = TREE_STRING_LENGTH (exp);
2889 return (const_hash_1 (TREE_REALPART (exp)) * 5
2890 + const_hash_1 (TREE_IMAGPART (exp)));
2894 unsigned HOST_WIDE_INT idx;
2897 hi = 5 + int_size_in_bytes (TREE_TYPE (exp));
2899 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, value)
2901 hi = hi * 603 + const_hash_1 (value);
2909 struct addr_const value;
2911 decode_addr_const (exp, &value);
2912 switch (GET_CODE (value.base))
2915 /* Don't hash the address of the SYMBOL_REF;
2916 only use the offset and the symbol name. */
2918 p = XSTR (value.base, 0);
2919 for (i = 0; p[i] != 0; i++)
2920 hi = ((hi * 613) + (unsigned) (p[i]));
2924 hi = value.offset + CODE_LABEL_NUMBER (XEXP (value.base, 0)) * 13;
2934 case POINTER_PLUS_EXPR:
2936 return (const_hash_1 (TREE_OPERAND (exp, 0)) * 9
2937 + const_hash_1 (TREE_OPERAND (exp, 1)));
2940 return const_hash_1 (TREE_OPERAND (exp, 0)) * 7 + 2;
2943 /* A language specific constant. Just hash the code. */
2947 /* Compute hashing function. */
2949 for (i = 0; i < len; i++)
2950 hi = ((hi * 613) + (unsigned) (p[i]));
2955 /* Wrapper of compare_constant, for the htab interface. */
2957 const_desc_eq (const void *p1, const void *p2)
2959 const struct constant_descriptor_tree *const c1
2960 = (const struct constant_descriptor_tree *) p1;
2961 const struct constant_descriptor_tree *const c2
2962 = (const struct constant_descriptor_tree *) p2;
2963 if (c1->hash != c2->hash)
2965 return compare_constant (c1->value, c2->value);
2968 /* Compare t1 and t2, and return 1 only if they are known to result in
2969 the same bit pattern on output. */
2972 compare_constant (const tree t1, const tree t2)
2974 enum tree_code typecode;
2976 if (t1 == NULL_TREE)
2977 return t2 == NULL_TREE;
2978 if (t2 == NULL_TREE)
2981 if (TREE_CODE (t1) != TREE_CODE (t2))
2984 switch (TREE_CODE (t1))
2987 /* Integer constants are the same only if the same width of type. */
2988 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2990 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2992 return tree_int_cst_equal (t1, t2);
2995 /* Real constants are the same only if the same width of type. */
2996 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2999 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2));
3002 /* Fixed constants are the same only if the same width of type. */
3003 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
3006 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1), TREE_FIXED_CST (t2));
3009 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
3012 return (TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
3013 && ! memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
3014 TREE_STRING_LENGTH (t1)));
3017 return (compare_constant (TREE_REALPART (t1), TREE_REALPART (t2))
3018 && compare_constant (TREE_IMAGPART (t1), TREE_IMAGPART (t2)));
3022 VEC(constructor_elt, gc) *v1, *v2;
3023 unsigned HOST_WIDE_INT idx;
3025 typecode = TREE_CODE (TREE_TYPE (t1));
3026 if (typecode != TREE_CODE (TREE_TYPE (t2)))
3029 if (typecode == ARRAY_TYPE)
3031 HOST_WIDE_INT size_1 = int_size_in_bytes (TREE_TYPE (t1));
3032 /* For arrays, check that the sizes all match. */
3033 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2))
3035 || size_1 != int_size_in_bytes (TREE_TYPE (t2)))
3040 /* For record and union constructors, require exact type
3042 if (TREE_TYPE (t1) != TREE_TYPE (t2))
3046 v1 = CONSTRUCTOR_ELTS (t1);
3047 v2 = CONSTRUCTOR_ELTS (t2);
3048 if (VEC_length (constructor_elt, v1)
3049 != VEC_length (constructor_elt, v2))
3052 for (idx = 0; idx < VEC_length (constructor_elt, v1); ++idx)
3054 constructor_elt *c1 = VEC_index (constructor_elt, v1, idx);
3055 constructor_elt *c2 = VEC_index (constructor_elt, v2, idx);
3057 /* Check that each value is the same... */
3058 if (!compare_constant (c1->value, c2->value))
3060 /* ... and that they apply to the same fields! */
3061 if (typecode == ARRAY_TYPE)
3063 if (!compare_constant (c1->index, c2->index))
3068 if (c1->index != c2->index)
3079 struct addr_const value1, value2;
3081 decode_addr_const (t1, &value1);
3082 decode_addr_const (t2, &value2);
3083 return (value1.offset == value2.offset
3084 && strcmp (XSTR (value1.base, 0), XSTR (value2.base, 0)) == 0);
3088 case POINTER_PLUS_EXPR:
3091 return (compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0))
3092 && compare_constant(TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1)));
3095 case VIEW_CONVERT_EXPR:
3096 return compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3105 /* Make a copy of the whole tree structure for a constant. This
3106 handles the same types of nodes that compare_constant handles. */
3109 copy_constant (tree exp)
3111 switch (TREE_CODE (exp))
3114 /* For ADDR_EXPR, we do not want to copy the decl whose address
3115 is requested. We do want to copy constants though. */
3116 if (CONSTANT_CLASS_P (TREE_OPERAND (exp, 0)))
3117 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
3118 copy_constant (TREE_OPERAND (exp, 0)));
3120 return copy_node (exp);
3126 return copy_node (exp);
3129 return build_complex (TREE_TYPE (exp),
3130 copy_constant (TREE_REALPART (exp)),
3131 copy_constant (TREE_IMAGPART (exp)));
3134 case POINTER_PLUS_EXPR:
3136 return build2 (TREE_CODE (exp), TREE_TYPE (exp),
3137 copy_constant (TREE_OPERAND (exp, 0)),
3138 copy_constant (TREE_OPERAND (exp, 1)));
3141 case VIEW_CONVERT_EXPR:
3142 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
3143 copy_constant (TREE_OPERAND (exp, 0)));
3147 tree copy = copy_node (exp);
3148 VEC(constructor_elt, gc) *v;
3149 unsigned HOST_WIDE_INT idx;
3150 tree purpose, value;
3152 v = VEC_alloc(constructor_elt, gc, VEC_length(constructor_elt,
3153 CONSTRUCTOR_ELTS (exp)));
3154 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp), idx, purpose, value)
3156 constructor_elt *ce = VEC_quick_push (constructor_elt, v, NULL);
3157 ce->index = purpose;
3158 ce->value = copy_constant (value);
3160 CONSTRUCTOR_ELTS (copy) = v;
3169 /* Return the alignment of constant EXP in bits. */
3172 get_constant_alignment (tree exp)
3176 align = TYPE_ALIGN (TREE_TYPE (exp));
3177 #ifdef CONSTANT_ALIGNMENT
3178 align = CONSTANT_ALIGNMENT (exp, align);
3183 /* Return the section into which constant EXP should be placed. */
3186 get_constant_section (tree exp)
3188 if (IN_NAMED_SECTION (exp))
3189 return get_named_section (exp, NULL, compute_reloc_for_constant (exp));
3191 return targetm.asm_out.select_section (exp,
3192 compute_reloc_for_constant (exp),
3193 get_constant_alignment (exp));
3196 /* Return the size of constant EXP in bytes. */
3198 static HOST_WIDE_INT
3199 get_constant_size (tree exp)
3203 size = int_size_in_bytes (TREE_TYPE (exp));
3204 if (TREE_CODE (exp) == STRING_CST)
3205 size = MAX (TREE_STRING_LENGTH (exp), size);
3209 /* Subroutine of output_constant_def:
3210 No constant equal to EXP is known to have been output.
3211 Make a constant descriptor to enter EXP in the hash table.
3212 Assign the label number and construct RTL to refer to the
3213 constant's location in memory.
3214 Caller is responsible for updating the hash table. */
3216 static struct constant_descriptor_tree *
3217 build_constant_desc (tree exp)
3223 struct constant_descriptor_tree *desc;
3225 desc = GGC_NEW (struct constant_descriptor_tree);
3226 desc->value = copy_constant (exp);
3228 /* Propagate marked-ness to copied constant. */
3229 if (flag_mudflap && mf_marked_p (exp))
3230 mf_mark (desc->value);
3232 /* Create a string containing the label name, in LABEL. */
3233 labelno = const_labelno++;
3234 ASM_GENERATE_INTERNAL_LABEL (label, "LC", labelno);
3236 /* We have a symbol name; construct the SYMBOL_REF and the MEM. */
3237 if (use_object_blocks_p ())
3239 section *sect = get_constant_section (exp);
3240 symbol = create_block_symbol (ggc_strdup (label),
3241 get_block_for_section (sect), -1);
3244 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3245 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3246 SET_SYMBOL_REF_DECL (symbol, desc->value);
3247 TREE_CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3249 rtl = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), symbol);
3250 set_mem_attributes (rtl, exp, 1);
3251 set_mem_alias_set (rtl, 0);
3252 set_mem_alias_set (rtl, const_alias_set);
3254 /* We cannot share RTX'es in pool entries.
3255 Mark this piece of RTL as required for unsharing. */
3256 RTX_FLAG (rtl, used) = 1;
3258 /* Set flags or add text to the name to record information, such as
3259 that it is a local symbol. If the name is changed, the macro
3260 ASM_OUTPUT_LABELREF will have to know how to strip this
3261 information. This call might invalidate our local variable
3262 SYMBOL; we can't use it afterward. */
3264 targetm.encode_section_info (exp, rtl, true);
3271 /* Return an rtx representing a reference to constant data in memory
3272 for the constant expression EXP.
3274 If assembler code for such a constant has already been output,
3275 return an rtx to refer to it.
3276 Otherwise, output such a constant in memory
3277 and generate an rtx for it.
3279 If DEFER is nonzero, this constant can be deferred and output only
3280 if referenced in the function after all optimizations.
3282 `const_desc_table' records which constants already have label strings. */
3285 output_constant_def (tree exp, int defer)
3287 struct constant_descriptor_tree *desc;
3288 struct constant_descriptor_tree key;
3291 /* Look up EXP in the table of constant descriptors. If we didn't find
3292 it, create a new one. */
3294 key.hash = const_hash_1 (exp);
3295 loc = htab_find_slot_with_hash (const_desc_htab, &key, key.hash, INSERT);
3297 desc = (struct constant_descriptor_tree *) *loc;
3300 desc = build_constant_desc (exp);
3301 desc->hash = key.hash;
3305 maybe_output_constant_def_contents (desc, defer);
3309 /* Subroutine of output_constant_def: Decide whether or not we need to
3310 output the constant DESC now, and if so, do it. */
3312 maybe_output_constant_def_contents (struct constant_descriptor_tree *desc,
3315 rtx symbol = XEXP (desc->rtl, 0);
3316 tree exp = desc->value;
3318 if (flag_syntax_only)
3321 if (TREE_ASM_WRITTEN (exp))
3322 /* Already output; don't do it again. */
3325 /* We can always defer constants as long as the context allows
3329 /* Increment n_deferred_constants if it exists. It needs to be at
3330 least as large as the number of constants actually referred to
3331 by the function. If it's too small we'll stop looking too early
3332 and fail to emit constants; if it's too large we'll only look
3333 through the entire function when we could have stopped earlier. */
3335 n_deferred_constants++;
3339 output_constant_def_contents (symbol);
3342 /* Subroutine of output_constant_def_contents. Output the definition
3343 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3344 constant's alignment in bits. */
3347 assemble_constant_contents (tree exp, const char *label, unsigned int align)
3351 size = get_constant_size (exp);
3353 /* Do any machine/system dependent processing of the constant. */
3354 #ifdef ASM_DECLARE_CONSTANT_NAME
3355 ASM_DECLARE_CONSTANT_NAME (asm_out_file, label, exp, size);
3357 /* Standard thing is just output label for the constant. */
3358 ASM_OUTPUT_LABEL (asm_out_file, label);
3359 #endif /* ASM_DECLARE_CONSTANT_NAME */
3361 /* Output the value of EXP. */
3362 output_constant (exp, size, align);
3365 /* We must output the constant data referred to by SYMBOL; do so. */
3368 output_constant_def_contents (rtx symbol)
3370 tree exp = SYMBOL_REF_DECL (symbol);
3373 /* Make sure any other constants whose addresses appear in EXP
3374 are assigned label numbers. */
3375 output_addressed_constants (exp);
3377 /* We are no longer deferring this constant. */
3378 TREE_ASM_WRITTEN (exp) = 1;
3380 /* If the constant is part of an object block, make sure that the
3381 decl has been positioned within its block, but do not write out
3382 its definition yet. output_object_blocks will do that later. */
3383 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
3384 place_block_symbol (symbol);
3387 switch_to_section (get_constant_section (exp));
3388 align = get_constant_alignment (exp);
3389 if (align > BITS_PER_UNIT)
3390 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
3391 assemble_constant_contents (exp, XSTR (symbol, 0), align);
3394 mudflap_enqueue_constant (exp);
3397 /* Look up EXP in the table of constant descriptors. Return the rtl
3398 if it has been emitted, else null. */
3401 lookup_constant_def (tree exp)
3403 struct constant_descriptor_tree *desc;
3404 struct constant_descriptor_tree key;
3407 key.hash = const_hash_1 (exp);
3408 desc = (struct constant_descriptor_tree *)
3409 htab_find_with_hash (const_desc_htab, &key, key.hash);
3411 return (desc ? desc->rtl : NULL_RTX);
3414 /* Used in the hash tables to avoid outputting the same constant
3415 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3416 are output once per function, not once per file. */
3417 /* ??? Only a few targets need per-function constant pools. Most
3418 can use one per-file pool. Should add a targetm bit to tell the
3421 struct GTY(()) rtx_constant_pool {
3422 /* Pointers to first and last constant in pool, as ordered by offset. */
3423 struct constant_descriptor_rtx *first;
3424 struct constant_descriptor_rtx *last;
3426 /* Hash facility for making memory-constants from constant rtl-expressions.
3427 It is used on RISC machines where immediate integer arguments and
3428 constant addresses are restricted so that such constants must be stored
3430 htab_t GTY((param_is (struct constant_descriptor_rtx))) const_rtx_htab;
3432 /* Current offset in constant pool (does not include any
3433 machine-specific header). */
3434 HOST_WIDE_INT offset;
3437 struct GTY((chain_next ("%h.next"))) constant_descriptor_rtx {
3438 struct constant_descriptor_rtx *next;
3442 HOST_WIDE_INT offset;
3444 enum machine_mode mode;
3450 /* Hash and compare functions for const_rtx_htab. */
3453 const_desc_rtx_hash (const void *ptr)
3455 const struct constant_descriptor_rtx *const desc
3456 = (const struct constant_descriptor_rtx *) ptr;
3461 const_desc_rtx_eq (const void *a, const void *b)
3463 const struct constant_descriptor_rtx *const x
3464 = (const struct constant_descriptor_rtx *) a;
3465 const struct constant_descriptor_rtx *const y
3466 = (const struct constant_descriptor_rtx *) b;
3468 if (x->mode != y->mode)
3470 return rtx_equal_p (x->constant, y->constant);
3473 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3476 const_rtx_hash_1 (rtx *xp, void *data)
3478 unsigned HOST_WIDE_INT hwi;
3479 enum machine_mode mode;
3485 code = GET_CODE (x);
3486 mode = GET_MODE (x);
3487 h = (hashval_t) code * 1048573 + mode;
3495 int shift = sizeof (hashval_t) * CHAR_BIT;
3496 const int n = sizeof (HOST_WIDE_INT) / sizeof (hashval_t);
3499 h ^= (hashval_t) hwi;
3500 for (i = 1; i < n; ++i)
3503 h ^= (hashval_t) hwi;
3509 if (mode == VOIDmode)
3511 hwi = CONST_DOUBLE_LOW (x) ^ CONST_DOUBLE_HIGH (x);
3515 h ^= real_hash (CONST_DOUBLE_REAL_VALUE (x));
3519 h ^= fixed_hash (CONST_FIXED_VALUE (x));
3525 for (i = XVECLEN (x, 0); i-- > 0; )
3526 h = h * 251 + const_rtx_hash_1 (&XVECEXP (x, 0, i), data);
3531 h ^= htab_hash_string (XSTR (x, 0));
3535 h = h * 251 + CODE_LABEL_NUMBER (XEXP (x, 0));
3539 case UNSPEC_VOLATILE:
3540 h = h * 251 + XINT (x, 1);
3547 hp = (hashval_t *) data;
3548 *hp = *hp * 509 + h;
3552 /* Compute a hash value for X, which should be a constant. */
3555 const_rtx_hash (rtx x)
3558 for_each_rtx (&x, const_rtx_hash_1, &h);
3563 /* Create and return a new rtx constant pool. */
3565 static struct rtx_constant_pool *
3566 create_constant_pool (void)
3568 struct rtx_constant_pool *pool;
3570 pool = GGC_NEW (struct rtx_constant_pool);
3571 pool->const_rtx_htab = htab_create_ggc (31, const_desc_rtx_hash,
3572 const_desc_rtx_eq, NULL);
3579 /* Initialize constant pool hashing for a new function. */
3582 init_varasm_status (void)
3584 crtl->varasm.pool = create_constant_pool ();
3585 crtl->varasm.deferred_constants = 0;
3588 /* Given a MINUS expression, simplify it if both sides
3589 include the same symbol. */
3592 simplify_subtraction (rtx x)
3594 rtx r = simplify_rtx (x);
3598 /* Given a constant rtx X, make (or find) a memory constant for its value
3599 and return a MEM rtx to refer to it in memory. */
3602 force_const_mem (enum machine_mode mode, rtx x)
3604 struct constant_descriptor_rtx *desc, tmp;
3605 struct rtx_constant_pool *pool;
3612 /* If we're not allowed to drop X into the constant pool, don't. */
3613 if (targetm.cannot_force_const_mem (x))
3616 /* Record that this function has used a constant pool entry. */
3617 crtl->uses_const_pool = 1;
3619 /* Decide which pool to use. */
3620 pool = (targetm.use_blocks_for_constant_p (mode, x)
3621 ? shared_constant_pool
3622 : crtl->varasm.pool);
3624 /* Lookup the value in the hashtable. */
3627 hash = const_rtx_hash (x);
3628 slot = htab_find_slot_with_hash (pool->const_rtx_htab, &tmp, hash, INSERT);
3629 desc = (struct constant_descriptor_rtx *) *slot;
3631 /* If the constant was already present, return its memory. */
3633 return copy_rtx (desc->mem);
3635 /* Otherwise, create a new descriptor. */
3636 desc = GGC_NEW (struct constant_descriptor_rtx);
3639 /* Align the location counter as required by EXP's data type. */
3640 align = GET_MODE_ALIGNMENT (mode == VOIDmode ? word_mode : mode);
3641 #ifdef CONSTANT_ALIGNMENT
3643 tree type = lang_hooks.types.type_for_mode (mode, 0);
3644 if (type != NULL_TREE)
3645 align = CONSTANT_ALIGNMENT (make_tree (type, x), align);
3649 pool->offset += (align / BITS_PER_UNIT) - 1;
3650 pool->offset &= ~ ((align / BITS_PER_UNIT) - 1);
3653 desc->constant = tmp.constant;
3654 desc->offset = pool->offset;
3657 desc->align = align;
3658 desc->labelno = const_labelno;
3661 pool->offset += GET_MODE_SIZE (mode);
3663 pool->last->next = desc;
3665 pool->first = pool->last = desc;
3668 /* Create a string containing the label name, in LABEL. */
3669 ASM_GENERATE_INTERNAL_LABEL (label, "LC", const_labelno);
3672 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3673 the constants pool. */
3674 if (use_object_blocks_p () && targetm.use_blocks_for_constant_p (mode, x))
3676 section *sect = targetm.asm_out.select_rtx_section (mode, x, align);
3677 symbol = create_block_symbol (ggc_strdup (label),
3678 get_block_for_section (sect), -1);
3681 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3683 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3684 CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3685 SET_SYMBOL_REF_CONSTANT (symbol, desc);
3687 /* Construct the MEM. */
3688 desc->mem = def = gen_const_mem (mode, symbol);
3689 set_mem_attributes (def, lang_hooks.types.type_for_mode (mode, 0), 1);
3690 set_mem_align (def, align);
3692 /* If we're dropping a label to the constant pool, make sure we
3694 if (GET_CODE (x) == LABEL_REF)
3695 LABEL_PRESERVE_P (XEXP (x, 0)) = 1;
3697 return copy_rtx (def);
3700 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3703 get_pool_constant (rtx addr)
3705 return SYMBOL_REF_CONSTANT (addr)->constant;
3708 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3709 and whether it has been output or not. */
3712 get_pool_constant_mark (rtx addr, bool *pmarked)
3714 struct constant_descriptor_rtx *desc;
3716 desc = SYMBOL_REF_CONSTANT (addr);
3717 *pmarked = (desc->mark != 0);
3718 return desc->constant;
3721 /* Similar, return the mode. */
3724 get_pool_mode (const_rtx addr)
3726 return SYMBOL_REF_CONSTANT (addr)->mode;
3729 /* Return the size of the constant pool. */
3732 get_pool_size (void)
3734 return crtl->varasm.pool->offset;
3737 /* Worker function for output_constant_pool_1. Emit assembly for X
3738 in MODE with known alignment ALIGN. */
3741 output_constant_pool_2 (enum machine_mode mode, rtx x, unsigned int align)
3743 switch (GET_MODE_CLASS (mode))
3746 case MODE_DECIMAL_FLOAT:
3750 gcc_assert (GET_CODE (x) == CONST_DOUBLE);
3751 REAL_VALUE_FROM_CONST_DOUBLE (r, x);
3752 assemble_real (r, mode, align);
3757 case MODE_PARTIAL_INT:
3762 assemble_integer (x, GET_MODE_SIZE (mode), align, 1);
3765 case MODE_VECTOR_FLOAT:
3766 case MODE_VECTOR_INT:
3767 case MODE_VECTOR_FRACT:
3768 case MODE_VECTOR_UFRACT:
3769 case MODE_VECTOR_ACCUM:
3770 case MODE_VECTOR_UACCUM:
3773 enum machine_mode submode = GET_MODE_INNER (mode);
3774 unsigned int subalign = MIN (align, GET_MODE_BITSIZE (submode));
3776 gcc_assert (GET_CODE (x) == CONST_VECTOR);
3777 units = CONST_VECTOR_NUNITS (x);
3779 for (i = 0; i < units; i++)
3781 rtx elt = CONST_VECTOR_ELT (x, i);
3782 output_constant_pool_2 (submode, elt, i ? subalign : align);
3792 /* Worker function for output_constant_pool. Emit constant DESC,
3793 giving it ALIGN bits of alignment. */
3796 output_constant_pool_1 (struct constant_descriptor_rtx *desc,
3803 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3804 whose CODE_LABEL has been deleted. This can occur if a jump table
3805 is eliminated by optimization. If so, write a constant of zero
3806 instead. Note that this can also happen by turning the
3807 CODE_LABEL into a NOTE. */
3808 /* ??? This seems completely and utterly wrong. Certainly it's
3809 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3810 functioning even with INSN_DELETED_P and friends. */
3813 switch (GET_CODE (tmp))
3816 if (GET_CODE (XEXP (tmp, 0)) != PLUS
3817 || GET_CODE (XEXP (XEXP (tmp, 0), 0)) != LABEL_REF)
3819 tmp = XEXP (XEXP (tmp, 0), 0);
3823 tmp = XEXP (tmp, 0);
3824 gcc_assert (!INSN_DELETED_P (tmp));
3825 gcc_assert (!NOTE_P (tmp)
3826 || NOTE_KIND (tmp) != NOTE_INSN_DELETED);
3833 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3834 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file, x, desc->mode,
3835 align, desc->labelno, done);
3838 assemble_align (align);
3840 /* Output the label. */
3841 targetm.asm_out.internal_label (asm_out_file, "LC", desc->labelno);
3843 /* Output the data. */
3844 output_constant_pool_2 (desc->mode, x, align);
3846 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3847 sections have proper size. */
3848 if (align > GET_MODE_BITSIZE (desc->mode)
3850 && (in_section->common.flags & SECTION_MERGE))
3851 assemble_align (align);
3853 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3859 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3860 to as used. Emit referenced deferred strings. This function can
3861 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3864 mark_constant (rtx *current_rtx, void *data ATTRIBUTE_UNUSED)
3866 rtx x = *current_rtx;
3868 if (x == NULL_RTX || GET_CODE (x) != SYMBOL_REF)
3871 if (CONSTANT_POOL_ADDRESS_P (x))
3873 struct constant_descriptor_rtx *desc = SYMBOL_REF_CONSTANT (x);
3874 if (desc->mark == 0)
3877 for_each_rtx (&desc->constant, mark_constant, NULL);
3880 else if (TREE_CONSTANT_POOL_ADDRESS_P (x))
3882 tree exp = SYMBOL_REF_DECL (x);
3883 if (!TREE_ASM_WRITTEN (exp))
3885 n_deferred_constants--;
3886 output_constant_def_contents (x);
3893 /* Look through appropriate parts of INSN, marking all entries in the
3894 constant pool which are actually being used. Entries that are only
3895 referenced by other constants are also marked as used. Emit
3896 deferred strings that are used. */
3899 mark_constants (rtx insn)
3904 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3905 insns, not any notes that may be attached. We don't want to mark
3906 a constant just because it happens to appear in a REG_EQUIV note. */
3907 if (GET_CODE (PATTERN (insn)) == SEQUENCE)
3909 rtx seq = PATTERN (insn);
3910 int i, n = XVECLEN (seq, 0);
3911 for (i = 0; i < n; ++i)
3913 rtx subinsn = XVECEXP (seq, 0, i);
3914 if (INSN_P (subinsn))
3915 for_each_rtx (&PATTERN (subinsn), mark_constant, NULL);
3919 for_each_rtx (&PATTERN (insn), mark_constant, NULL);
3922 /* Look through the instructions for this function, and mark all the
3923 entries in POOL which are actually being used. Emit deferred constants
3924 which have indeed been used. */
3927 mark_constant_pool (void)
3931 if (!crtl->uses_const_pool && n_deferred_constants == 0)
3934 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
3935 mark_constants (insn);
3937 for (link = crtl->epilogue_delay_list;
3939 link = XEXP (link, 1))
3940 mark_constants (XEXP (link, 0));
3943 /* Write all the constants in POOL. */
3946 output_constant_pool_contents (struct rtx_constant_pool *pool)
3948 struct constant_descriptor_rtx *desc;
3950 for (desc = pool->first; desc ; desc = desc->next)
3953 /* If the constant is part of an object_block, make sure that
3954 the constant has been positioned within its block, but do not
3955 write out its definition yet. output_object_blocks will do
3957 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc->sym)
3958 && SYMBOL_REF_BLOCK (desc->sym))
3959 place_block_symbol (desc->sym);
3962 switch_to_section (targetm.asm_out.select_rtx_section
3963 (desc->mode, desc->constant, desc->align));
3964 output_constant_pool_1 (desc, desc->align);
3969 /* Mark all constants that are used in the current function, then write
3970 out the function's private constant pool. */
3973 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED,
3974 tree fndecl ATTRIBUTE_UNUSED)
3976 struct rtx_constant_pool *pool = crtl->varasm.pool;
3978 /* It is possible for gcc to call force_const_mem and then to later
3979 discard the instructions which refer to the constant. In such a
3980 case we do not need to output the constant. */
3981 mark_constant_pool ();
3983 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3984 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file, fnname, fndecl, pool->offset);
3987 output_constant_pool_contents (pool);
3989 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3990 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file, fnname, fndecl, pool->offset);
3994 /* Write the contents of the shared constant pool. */
3997 output_shared_constant_pool (void)
3999 output_constant_pool_contents (shared_constant_pool);
4002 /* Determine what kind of relocations EXP may need. */
4005 compute_reloc_for_constant (tree exp)
4007 int reloc = 0, reloc2;
4010 switch (TREE_CODE (exp))
4014 /* Go inside any operations that get_inner_reference can handle and see
4015 if what's inside is a constant: no need to do anything here for
4016 addresses of variables or functions. */
4017 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
4018 tem = TREE_OPERAND (tem, 0))
4021 if (TREE_PUBLIC (tem))
4028 case POINTER_PLUS_EXPR:
4029 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
4030 reloc |= compute_reloc_for_constant (TREE_OPERAND (exp, 1));
4034 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
4035 reloc2 = compute_reloc_for_constant (TREE_OPERAND (exp, 1));
4036 /* The difference of two local labels is computable at link time. */
4037 if (reloc == 1 && reloc2 == 1)
4044 case VIEW_CONVERT_EXPR:
4045 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
4050 unsigned HOST_WIDE_INT idx;
4051 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
4053 reloc |= compute_reloc_for_constant (tem);
4063 /* Find all the constants whose addresses are referenced inside of EXP,
4064 and make sure assembler code with a label has been output for each one.
4065 Indicate whether an ADDR_EXPR has been encountered. */
4068 output_addressed_constants (tree exp)
4072 switch (TREE_CODE (exp))
4076 /* Go inside any operations that get_inner_reference can handle and see
4077 if what's inside is a constant: no need to do anything here for
4078 addresses of variables or functions. */
4079 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
4080 tem = TREE_OPERAND (tem, 0))
4083 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4084 if (TREE_CODE (tem) == CONST_DECL && DECL_INITIAL (tem))
4085 tem = DECL_INITIAL (tem);
4087 if (CONSTANT_CLASS_P (tem) || TREE_CODE (tem) == CONSTRUCTOR)
4088 output_constant_def (tem, 0);
4092 case POINTER_PLUS_EXPR:
4094 output_addressed_constants (TREE_OPERAND (exp, 1));
4098 case VIEW_CONVERT_EXPR:
4099 output_addressed_constants (TREE_OPERAND (exp, 0));
4104 unsigned HOST_WIDE_INT idx;
4105 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
4107 output_addressed_constants (tem);
4116 /* Whether a constructor CTOR is a valid static constant initializer if all
4117 its elements are. This used to be internal to initializer_constant_valid_p
4118 and has been exposed to let other functions like categorize_ctor_elements
4119 evaluate the property while walking a constructor for other purposes. */
4122 constructor_static_from_elts_p (const_tree ctor)
4124 return (TREE_CONSTANT (ctor)
4125 && (TREE_CODE (TREE_TYPE (ctor)) == UNION_TYPE
4126 || TREE_CODE (TREE_TYPE (ctor)) == RECORD_TYPE)
4127 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (ctor)));
4130 static tree initializer_constant_valid_p_1 (tree value, tree endtype,
4133 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4134 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4135 which are valid when ENDTYPE is an integer of any size; in
4136 particular, this does not accept a pointer minus a constant. This
4137 returns null_pointer_node if the VALUE is an absolute constant
4138 which can be used to initialize a static variable. Otherwise it
4142 narrowing_initializer_constant_valid_p (tree value, tree endtype, tree *cache)
4146 if (!INTEGRAL_TYPE_P (endtype))
4149 op0 = TREE_OPERAND (value, 0);
4150 op1 = TREE_OPERAND (value, 1);
4152 /* Like STRIP_NOPS except allow the operand mode to widen. This
4153 works around a feature of fold that simplifies (int)(p1 - p2) to
4154 ((int)p1 - (int)p2) under the theory that the narrower operation
4157 while (CONVERT_EXPR_P (op0)
4158 || TREE_CODE (op0) == NON_LVALUE_EXPR)
4160 tree inner = TREE_OPERAND (op0, 0);
4161 if (inner == error_mark_node
4162 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
4163 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0)))
4164 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
4169 while (CONVERT_EXPR_P (op1)
4170 || TREE_CODE (op1) == NON_LVALUE_EXPR)
4172 tree inner = TREE_OPERAND (op1, 0);
4173 if (inner == error_mark_node
4174 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
4175 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1)))
4176 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
4181 op0 = initializer_constant_valid_p_1 (op0, endtype, cache);
4185 op1 = initializer_constant_valid_p_1 (op1, endtype,
4186 cache ? cache + 2 : NULL);
4187 /* Both initializers must be known. */
4191 && (op0 == null_pointer_node
4192 || TREE_CODE (value) == MINUS_EXPR))
4193 return null_pointer_node;
4195 /* Support differences between labels. */
4196 if (TREE_CODE (op0) == LABEL_DECL
4197 && TREE_CODE (op1) == LABEL_DECL)
4198 return null_pointer_node;
4200 if (TREE_CODE (op0) == STRING_CST
4201 && TREE_CODE (op1) == STRING_CST
4202 && operand_equal_p (op0, op1, 1))
4203 return null_pointer_node;
4209 /* Helper function of initializer_constant_valid_p.
4210 Return nonzero if VALUE is a valid constant-valued expression
4211 for use in initializing a static variable; one that can be an
4212 element of a "constant" initializer.
4214 Return null_pointer_node if the value is absolute;
4215 if it is relocatable, return the variable that determines the relocation.
4216 We assume that VALUE has been folded as much as possible;
4217 therefore, we do not need to check for such things as
4218 arithmetic-combinations of integers.
4220 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4223 initializer_constant_valid_p_1 (tree value, tree endtype, tree *cache)
4227 switch (TREE_CODE (value))
4230 if (constructor_static_from_elts_p (value))
4232 unsigned HOST_WIDE_INT idx;
4234 bool absolute = true;
4236 if (cache && cache[0] == value)
4238 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value), idx, elt)
4241 reloc = initializer_constant_valid_p_1 (elt, TREE_TYPE (elt),
4248 cache[1] = NULL_TREE;
4252 if (reloc != null_pointer_node)
4255 /* For a non-absolute relocation, there is no single
4256 variable that can be "the variable that determines the
4261 cache[1] = absolute ? null_pointer_node : error_mark_node;
4263 return absolute ? null_pointer_node : error_mark_node;
4266 return TREE_STATIC (value) ? null_pointer_node : NULL_TREE;
4274 return null_pointer_node;
4279 tree op0 = staticp (TREE_OPERAND (value, 0));
4282 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4283 to be a constant, this is old-skool offsetof-like nonsense. */
4284 if (TREE_CODE (op0) == INDIRECT_REF
4285 && TREE_CONSTANT (TREE_OPERAND (op0, 0)))
4286 return null_pointer_node;
4287 /* Taking the address of a nested function involves a trampoline,
4288 unless we don't need or want one. */
4289 if (TREE_CODE (op0) == FUNCTION_DECL
4290 && DECL_STATIC_CHAIN (op0)
4291 && !TREE_NO_TRAMPOLINE (value))
4293 /* "&{...}" requires a temporary to hold the constructed
4295 if (TREE_CODE (op0) == CONSTRUCTOR)
4301 case NON_LVALUE_EXPR:
4302 return initializer_constant_valid_p_1 (TREE_OPERAND (value, 0),
4305 case VIEW_CONVERT_EXPR:
4307 tree src = TREE_OPERAND (value, 0);
4308 tree src_type = TREE_TYPE (src);
4309 tree dest_type = TREE_TYPE (value);
4311 /* Allow view-conversions from aggregate to non-aggregate type only
4312 if the bit pattern is fully preserved afterwards; otherwise, the
4313 RTL expander won't be able to apply a subsequent transformation
4314 to the underlying constructor. */
4315 if (AGGREGATE_TYPE_P (src_type) && !AGGREGATE_TYPE_P (dest_type))
4317 if (TYPE_MODE (endtype) == TYPE_MODE (dest_type))
4318 return initializer_constant_valid_p_1 (src, endtype, cache);
4323 /* Allow all other kinds of view-conversion. */
4324 return initializer_constant_valid_p_1 (src, endtype, cache);
4329 tree src = TREE_OPERAND (value, 0);
4330 tree src_type = TREE_TYPE (src);
4331 tree dest_type = TREE_TYPE (value);
4333 /* Allow conversions between pointer types, floating-point
4334 types, and offset types. */
4335 if ((POINTER_TYPE_P (dest_type) && POINTER_TYPE_P (src_type))
4336 || (FLOAT_TYPE_P (dest_type) && FLOAT_TYPE_P (src_type))
4337 || (TREE_CODE (dest_type) == OFFSET_TYPE
4338 && TREE_CODE (src_type) == OFFSET_TYPE))
4339 return initializer_constant_valid_p_1 (src, endtype, cache);
4341 /* Allow length-preserving conversions between integer types. */
4342 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type)
4343 && (TYPE_PRECISION (dest_type) == TYPE_PRECISION (src_type)))
4344 return initializer_constant_valid_p_1 (src, endtype, cache);
4346 /* Allow conversions between other integer types only if
4348 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type))
4350 tree inner = initializer_constant_valid_p_1 (src, endtype, cache);
4351 if (inner == null_pointer_node)
4352 return null_pointer_node;
4356 /* Allow (int) &foo provided int is as wide as a pointer. */
4357 if (INTEGRAL_TYPE_P (dest_type) && POINTER_TYPE_P (src_type)
4358 && (TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type)))
4359 return initializer_constant_valid_p_1 (src, endtype, cache);
4361 /* Likewise conversions from int to pointers, but also allow
4362 conversions from 0. */
4363 if ((POINTER_TYPE_P (dest_type)
4364 || TREE_CODE (dest_type) == OFFSET_TYPE)
4365 && INTEGRAL_TYPE_P (src_type))
4367 if (TREE_CODE (src) == INTEGER_CST
4368 && TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type))
4369 return null_pointer_node;
4370 if (integer_zerop (src))
4371 return null_pointer_node;
4372 else if (TYPE_PRECISION (dest_type) <= TYPE_PRECISION (src_type))
4373 return initializer_constant_valid_p_1 (src, endtype, cache);
4376 /* Allow conversions to struct or union types if the value
4378 if (TREE_CODE (dest_type) == RECORD_TYPE
4379 || TREE_CODE (dest_type) == UNION_TYPE)
4380 return initializer_constant_valid_p_1 (src, endtype, cache);
4384 case POINTER_PLUS_EXPR:
4386 /* Any valid floating-point constants will have been folded by now;
4387 with -frounding-math we hit this with addition of two constants. */
4388 if (TREE_CODE (endtype) == REAL_TYPE)
4390 if (cache && cache[0] == value)
4392 if (! INTEGRAL_TYPE_P (endtype)
4393 || TYPE_PRECISION (endtype) >= TYPE_PRECISION (TREE_TYPE (value)))
4395 tree ncache[4] = { NULL_TREE, NULL_TREE, NULL_TREE, NULL_TREE };
4397 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 0),
4400 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 1),
4401 endtype, ncache + 2);
4402 /* If either term is absolute, use the other term's relocation. */
4403 if (valid0 == null_pointer_node)
4405 else if (valid1 == null_pointer_node)
4407 /* Support narrowing pointer differences. */
4409 ret = narrowing_initializer_constant_valid_p (value, endtype,
4413 /* Support narrowing pointer differences. */
4414 ret = narrowing_initializer_constant_valid_p (value, endtype, NULL);
4423 if (TREE_CODE (endtype) == REAL_TYPE)
4425 if (cache && cache[0] == value)
4427 if (! INTEGRAL_TYPE_P (endtype)
4428 || TYPE_PRECISION (endtype) >= TYPE_PRECISION (TREE_TYPE (value)))
4430 tree ncache[4] = { NULL_TREE, NULL_TREE, NULL_TREE, NULL_TREE };
4432 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 0),
4435 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 1),
4436 endtype, ncache + 2);
4437 /* Win if second argument is absolute. */
4438 if (valid1 == null_pointer_node)
4440 /* Win if both arguments have the same relocation.
4441 Then the value is absolute. */
4442 else if (valid0 == valid1 && valid0 != 0)
4443 ret = null_pointer_node;
4444 /* Since GCC guarantees that string constants are unique in the
4445 generated code, a subtraction between two copies of the same
4446 constant string is absolute. */
4447 else if (valid0 && TREE_CODE (valid0) == STRING_CST
4448 && valid1 && TREE_CODE (valid1) == STRING_CST
4449 && operand_equal_p (valid0, valid1, 1))
4450 ret = null_pointer_node;
4451 /* Support narrowing differences. */
4453 ret = narrowing_initializer_constant_valid_p (value, endtype,
4457 /* Support narrowing differences. */
4458 ret = narrowing_initializer_constant_valid_p (value, endtype, NULL);
4473 /* Return nonzero if VALUE is a valid constant-valued expression
4474 for use in initializing a static variable; one that can be an
4475 element of a "constant" initializer.
4477 Return null_pointer_node if the value is absolute;
4478 if it is relocatable, return the variable that determines the relocation.
4479 We assume that VALUE has been folded as much as possible;
4480 therefore, we do not need to check for such things as
4481 arithmetic-combinations of integers. */
4483 initializer_constant_valid_p (tree value, tree endtype)
4485 return initializer_constant_valid_p_1 (value, endtype, NULL);
4488 /* Return true if VALUE is a valid constant-valued expression
4489 for use in initializing a static bit-field; one that can be
4490 an element of a "constant" initializer. */
4493 initializer_constant_valid_for_bitfield_p (tree value)
4495 /* For bitfields we support integer constants or possibly nested aggregates
4497 switch (TREE_CODE (value))
4501 unsigned HOST_WIDE_INT idx;
4504 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value), idx, elt)
4505 if (!initializer_constant_valid_for_bitfield_p (elt))
4513 case VIEW_CONVERT_EXPR:
4514 case NON_LVALUE_EXPR:
4516 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value, 0));
4525 /* output_constructor outer state of relevance in recursive calls, typically
4526 for nested aggregate bitfields. */
4529 unsigned int bit_offset; /* current position in ... */
4530 int byte; /* ... the outer byte buffer. */
4533 static unsigned HOST_WIDE_INT
4534 output_constructor (tree, unsigned HOST_WIDE_INT, unsigned int,
4537 /* Output assembler code for constant EXP to FILE, with no label.
4538 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4539 Assumes output_addressed_constants has been done on EXP already.
4541 Generate exactly SIZE bytes of assembler data, padding at the end
4542 with zeros if necessary. SIZE must always be specified.
4544 SIZE is important for structure constructors,
4545 since trailing members may have been omitted from the constructor.
4546 It is also important for initialization of arrays from string constants
4547 since the full length of the string constant might not be wanted.
4548 It is also needed for initialization of unions, where the initializer's
4549 type is just one member, and that may not be as long as the union.
4551 There a case in which we would fail to output exactly SIZE bytes:
4552 for a structure constructor that wants to produce more than SIZE bytes.
4553 But such constructors will never be generated for any possible input.
4555 ALIGN is the alignment of the data in bits. */
4558 output_constant (tree exp, unsigned HOST_WIDE_INT size, unsigned int align)
4560 enum tree_code code;
4561 unsigned HOST_WIDE_INT thissize;
4563 if (size == 0 || flag_syntax_only)
4566 /* See if we're trying to initialize a pointer in a non-default mode
4567 to the address of some declaration somewhere. If the target says
4568 the mode is valid for pointers, assume the target has a way of
4570 if (TREE_CODE (exp) == NOP_EXPR
4571 && POINTER_TYPE_P (TREE_TYPE (exp))
4572 && targetm.addr_space.valid_pointer_mode
4573 (TYPE_MODE (TREE_TYPE (exp)),
4574 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp)))))
4576 tree saved_type = TREE_TYPE (exp);
4578 /* Peel off any intermediate conversions-to-pointer for valid
4580 while (TREE_CODE (exp) == NOP_EXPR
4581 && POINTER_TYPE_P (TREE_TYPE (exp))
4582 && targetm.addr_space.valid_pointer_mode
4583 (TYPE_MODE (TREE_TYPE (exp)),
4584 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp)))))
4585 exp = TREE_OPERAND (exp, 0);
4587 /* If what we're left with is the address of something, we can
4588 convert the address to the final type and output it that
4590 if (TREE_CODE (exp) == ADDR_EXPR)
4591 exp = build1 (ADDR_EXPR, saved_type, TREE_OPERAND (exp, 0));
4592 /* Likewise for constant ints. */
4593 else if (TREE_CODE (exp) == INTEGER_CST)
4594 exp = build_int_cst_wide (saved_type, TREE_INT_CST_LOW (exp),
4595 TREE_INT_CST_HIGH (exp));
4599 /* Eliminate any conversions since we'll be outputting the underlying
4601 while (CONVERT_EXPR_P (exp)
4602 || TREE_CODE (exp) == NON_LVALUE_EXPR
4603 || TREE_CODE (exp) == VIEW_CONVERT_EXPR)
4605 HOST_WIDE_INT type_size = int_size_in_bytes (TREE_TYPE (exp));
4606 HOST_WIDE_INT op_size = int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp, 0)));
4608 /* Make sure eliminating the conversion is really a no-op, except with
4609 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4610 union types to allow for Ada unchecked unions. */
4611 if (type_size > op_size
4612 && TREE_CODE (exp) != VIEW_CONVERT_EXPR
4613 && TREE_CODE (TREE_TYPE (exp)) != UNION_TYPE)
4614 /* Keep the conversion. */
4617 exp = TREE_OPERAND (exp, 0);
4620 code = TREE_CODE (TREE_TYPE (exp));
4621 thissize = int_size_in_bytes (TREE_TYPE (exp));
4623 /* Allow a constructor with no elements for any data type.
4624 This means to fill the space with zeros. */
4625 if (TREE_CODE (exp) == CONSTRUCTOR
4626 && VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (exp)))
4628 assemble_zeros (size);
4632 if (TREE_CODE (exp) == FDESC_EXPR)
4634 #ifdef ASM_OUTPUT_FDESC
4635 HOST_WIDE_INT part = tree_low_cst (TREE_OPERAND (exp, 1), 0);
4636 tree decl = TREE_OPERAND (exp, 0);
4637 ASM_OUTPUT_FDESC (asm_out_file, decl, part);
4644 /* Now output the underlying data. If we've handling the padding, return.
4645 Otherwise, break and ensure SIZE is the size written. */
4652 case REFERENCE_TYPE:
4654 case FIXED_POINT_TYPE:
4655 if (! assemble_integer (expand_expr (exp, NULL_RTX, VOIDmode,
4656 EXPAND_INITIALIZER),
4657 MIN (size, thissize), align, 0))
4658 error ("initializer for integer/fixed-point value is too complicated");
4662 if (TREE_CODE (exp) != REAL_CST)
4663 error ("initializer for floating value is not a floating constant");
4665 assemble_real (TREE_REAL_CST (exp), TYPE_MODE (TREE_TYPE (exp)), align);
4669 output_constant (TREE_REALPART (exp), thissize / 2, align);
4670 output_constant (TREE_IMAGPART (exp), thissize / 2,
4671 min_align (align, BITS_PER_UNIT * (thissize / 2)));
4676 switch (TREE_CODE (exp))
4679 output_constructor (exp, size, align, NULL);
4682 thissize = MIN ((unsigned HOST_WIDE_INT)TREE_STRING_LENGTH (exp),
4684 assemble_string (TREE_STRING_POINTER (exp), thissize);
4691 unsigned int nalign;
4692 enum machine_mode inner;
4694 inner = TYPE_MODE (TREE_TYPE (TREE_TYPE (exp)));
4695 nalign = MIN (align, GET_MODE_ALIGNMENT (inner));
4697 elt_size = GET_MODE_SIZE (inner);
4699 link = TREE_VECTOR_CST_ELTS (exp);
4700 output_constant (TREE_VALUE (link), elt_size, align);
4701 thissize = elt_size;
4702 while ((link = TREE_CHAIN (link)) != NULL)
4704 output_constant (TREE_VALUE (link), elt_size, nalign);
4705 thissize += elt_size;
4716 gcc_assert (TREE_CODE (exp) == CONSTRUCTOR);
4717 output_constructor (exp, size, align, NULL);
4727 if (size > thissize)
4728 assemble_zeros (size - thissize);
4732 /* Subroutine of output_constructor, used for computing the size of
4733 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4734 type with an unspecified upper bound. */
4736 static unsigned HOST_WIDE_INT
4737 array_size_for_constructor (tree val)
4740 unsigned HOST_WIDE_INT cnt;
4741 tree index, value, tmp;
4743 /* This code used to attempt to handle string constants that are not
4744 arrays of single-bytes, but nothing else does, so there's no point in
4746 if (TREE_CODE (val) == STRING_CST)
4747 return TREE_STRING_LENGTH (val);
4749 max_index = NULL_TREE;
4750 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val), cnt, index, value)
4752 if (TREE_CODE (index) == RANGE_EXPR)
4753 index = TREE_OPERAND (index, 1);
4754 if (max_index == NULL_TREE || tree_int_cst_lt (max_index, index))
4758 if (max_index == NULL_TREE)
4761 /* Compute the total number of array elements. */
4762 tmp = TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val)));
4763 i = size_binop (MINUS_EXPR, fold_convert (sizetype, max_index),
4764 fold_convert (sizetype, tmp));
4765 i = size_binop (PLUS_EXPR, i, build_int_cst (sizetype, 1));
4767 /* Multiply by the array element unit size to find number of bytes. */
4768 i = size_binop (MULT_EXPR, i, TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val))));
4770 return tree_low_cst (i, 1);
4773 /* Other datastructures + helpers for output_constructor. */
4775 /* output_constructor local state to support interaction with helpers. */
4779 /* Received arguments. */
4780 tree exp; /* Constructor expression. */
4781 unsigned HOST_WIDE_INT size; /* # bytes to output - pad if necessary. */
4782 unsigned int align; /* Known initial alignment. */
4784 /* Constructor expression data. */
4785 tree type; /* Expression type. */
4786 tree field; /* Current field decl in a record. */
4787 tree min_index; /* Lower bound if specified for an array. */
4789 /* Output processing state. */
4790 HOST_WIDE_INT total_bytes; /* # bytes output so far / current position. */
4791 bool byte_buffer_in_use; /* Whether byte ... */
4792 int byte; /* ... contains part of a bitfield byte yet to
4795 int last_relative_index; /* Implicit or explicit index of the last
4796 array element output within a bitfield. */
4797 /* Current element. */
4798 tree val; /* Current element value. */
4799 tree index; /* Current element index. */
4803 /* Helper for output_constructor. From the current LOCAL state, output a
4804 RANGE_EXPR element. */
4807 output_constructor_array_range (oc_local_state *local)
4809 unsigned HOST_WIDE_INT fieldsize
4810 = int_size_in_bytes (TREE_TYPE (local->type));
4812 HOST_WIDE_INT lo_index
4813 = tree_low_cst (TREE_OPERAND (local->index, 0), 0);
4814 HOST_WIDE_INT hi_index
4815 = tree_low_cst (TREE_OPERAND (local->index, 1), 0);
4816 HOST_WIDE_INT index;
4819 = min_align (local->align, fieldsize * BITS_PER_UNIT);
4821 for (index = lo_index; index <= hi_index; index++)
4823 /* Output the element's initial value. */
4824 if (local->val == NULL_TREE)
4825 assemble_zeros (fieldsize);
4827 output_constant (local->val, fieldsize, align2);
4829 /* Count its size. */
4830 local->total_bytes += fieldsize;
4834 /* Helper for output_constructor. From the current LOCAL state, output a
4835 field element that is not true bitfield or part of an outer one. */
4838 output_constructor_regular_field (oc_local_state *local)
4840 /* Field size and position. Since this structure is static, we know the
4841 positions are constant. */
4842 unsigned HOST_WIDE_INT fieldsize;
4843 HOST_WIDE_INT fieldpos;
4845 unsigned int align2;
4847 if (local->index != NULL_TREE)
4848 fieldpos = (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (local->val)), 1)
4849 * ((tree_low_cst (local->index, 0)
4850 - tree_low_cst (local->min_index, 0))));
4851 else if (local->field != NULL_TREE)
4852 fieldpos = int_byte_position (local->field);
4856 /* Output any buffered-up bit-fields preceding this element. */
4857 if (local->byte_buffer_in_use)
4859 assemble_integer (GEN_INT (local->byte), 1, BITS_PER_UNIT, 1);
4860 local->total_bytes++;
4861 local->byte_buffer_in_use = false;
4864 /* Advance to offset of this element.
4865 Note no alignment needed in an array, since that is guaranteed
4866 if each element has the proper size. */
4867 if ((local->field != NULL_TREE || local->index != NULL_TREE)
4868 && fieldpos != local->total_bytes)
4870 gcc_assert (fieldpos >= local->total_bytes);
4871 assemble_zeros (fieldpos - local->total_bytes);
4872 local->total_bytes = fieldpos;
4875 /* Find the alignment of this element. */
4876 align2 = min_align (local->align, BITS_PER_UNIT * fieldpos);
4878 /* Determine size this element should occupy. */
4883 /* If this is an array with an unspecified upper bound,
4884 the initializer determines the size. */
4885 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4886 but we cannot do this until the deprecated support for
4887 initializing zero-length array members is removed. */
4888 if (TREE_CODE (TREE_TYPE (local->field)) == ARRAY_TYPE
4889 && TYPE_DOMAIN (TREE_TYPE (local->field))
4890 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local->field))))
4892 fieldsize = array_size_for_constructor (local->val);
4893 /* Given a non-empty initialization, this field had
4895 gcc_assert (!fieldsize || !TREE_CHAIN (local->field));
4897 else if (DECL_SIZE_UNIT (local->field))
4899 /* ??? This can't be right. If the decl size overflows
4900 a host integer we will silently emit no data. */
4901 if (host_integerp (DECL_SIZE_UNIT (local->field), 1))
4902 fieldsize = tree_low_cst (DECL_SIZE_UNIT (local->field), 1);
4906 fieldsize = int_size_in_bytes (TREE_TYPE (local->type));
4908 /* Output the element's initial value. */
4909 if (local->val == NULL_TREE)
4910 assemble_zeros (fieldsize);
4912 output_constant (local->val, fieldsize, align2);
4914 /* Count its size. */
4915 local->total_bytes += fieldsize;
4918 /* Helper for output_constructor. From the current LOCAL and OUTER states,
4919 output an element that is a true bitfield or part of an outer one. */
4922 output_constructor_bitfield (oc_local_state *local, oc_outer_state *outer)
4924 /* Bit size of this element. */
4925 HOST_WIDE_INT ebitsize
4927 ? tree_low_cst (DECL_SIZE (local->field), 1)
4928 : tree_low_cst (TYPE_SIZE (TREE_TYPE (local->type)), 1));
4930 /* Relative index of this element if this is an array component. */
4931 HOST_WIDE_INT relative_index
4934 ? (tree_low_cst (local->index, 0)
4935 - tree_low_cst (local->min_index, 0))
4936 : local->last_relative_index + 1)
4939 /* Bit position of this element from the start of the containing
4941 HOST_WIDE_INT constructor_relative_ebitpos
4943 ? int_bit_position (local->field)
4944 : ebitsize * relative_index);
4946 /* Bit position of this element from the start of a possibly ongoing
4947 outer byte buffer. */
4948 HOST_WIDE_INT byte_relative_ebitpos
4949 = ((outer ? outer->bit_offset : 0) + constructor_relative_ebitpos);
4951 /* From the start of a possibly ongoing outer byte buffer, offsets to
4952 the first bit of this element and to the first bit past the end of
4954 HOST_WIDE_INT next_offset = byte_relative_ebitpos;
4955 HOST_WIDE_INT end_offset = byte_relative_ebitpos + ebitsize;
4957 local->last_relative_index = relative_index;
4959 if (local->val == NULL_TREE)
4960 local->val = integer_zero_node;
4962 while (TREE_CODE (local->val) == VIEW_CONVERT_EXPR
4963 || TREE_CODE (local->val) == NON_LVALUE_EXPR)
4964 local->val = TREE_OPERAND (local->val, 0);
4966 if (TREE_CODE (local->val) != INTEGER_CST
4967 && TREE_CODE (local->val) != CONSTRUCTOR)
4969 error ("invalid initial value for member %qE", DECL_NAME (local->field));
4973 /* If this field does not start in this (or, next) byte,
4975 if (next_offset / BITS_PER_UNIT != local->total_bytes)
4977 /* Output remnant of any bit field in previous bytes. */
4978 if (local->byte_buffer_in_use)
4980 assemble_integer (GEN_INT (local->byte), 1, BITS_PER_UNIT, 1);
4981 local->total_bytes++;
4982 local->byte_buffer_in_use = false;
4985 /* If still not at proper byte, advance to there. */
4986 if (next_offset / BITS_PER_UNIT != local->total_bytes)
4988 gcc_assert (next_offset / BITS_PER_UNIT >= local->total_bytes);
4989 assemble_zeros (next_offset / BITS_PER_UNIT - local->total_bytes);
4990 local->total_bytes = next_offset / BITS_PER_UNIT;
4994 /* Set up the buffer if necessary. */
4995 if (!local->byte_buffer_in_use)
4999 local->byte_buffer_in_use = true;
5002 /* If this is nested constructor, recurse passing the bit offset and the
5003 pending data, then retrieve the new pending data afterwards. */
5004 if (TREE_CODE (local->val) == CONSTRUCTOR)
5006 oc_outer_state output_state;
5008 output_state.bit_offset = next_offset % BITS_PER_UNIT;
5009 output_state.byte = local->byte;
5011 += output_constructor (local->val, 0, 0, &output_state);
5012 local->byte = output_state.byte;
5016 /* Otherwise, we must split the element into pieces that fall within
5017 separate bytes, and combine each byte with previous or following
5019 while (next_offset < end_offset)
5023 HOST_WIDE_INT value;
5024 HOST_WIDE_INT next_byte = next_offset / BITS_PER_UNIT;
5025 HOST_WIDE_INT next_bit = next_offset % BITS_PER_UNIT;
5027 /* Advance from byte to byte
5028 within this element when necessary. */
5029 while (next_byte != local->total_bytes)
5031 assemble_integer (GEN_INT (local->byte), 1, BITS_PER_UNIT, 1);
5032 local->total_bytes++;
5036 /* Number of bits we can process at once
5037 (all part of the same byte). */
5038 this_time = MIN (end_offset - next_offset,
5039 BITS_PER_UNIT - next_bit);
5040 if (BYTES_BIG_ENDIAN)
5042 /* On big-endian machine, take the most significant bits
5043 first (of the bits that are significant)
5044 and put them into bytes from the most significant end. */
5045 shift = end_offset - next_offset - this_time;
5047 /* Don't try to take a bunch of bits that cross
5048 the word boundary in the INTEGER_CST. We can
5049 only select bits from the LOW or HIGH part
5051 if (shift < HOST_BITS_PER_WIDE_INT
5052 && shift + this_time > HOST_BITS_PER_WIDE_INT)
5054 this_time = shift + this_time - HOST_BITS_PER_WIDE_INT;
5055 shift = HOST_BITS_PER_WIDE_INT;
5058 /* Now get the bits from the appropriate constant word. */
5059 if (shift < HOST_BITS_PER_WIDE_INT)
5060 value = TREE_INT_CST_LOW (local->val);
5063 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
5064 value = TREE_INT_CST_HIGH (local->val);
5065 shift -= HOST_BITS_PER_WIDE_INT;
5068 /* Get the result. This works only when:
5069 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5070 local->byte |= (((value >> shift)
5071 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
5072 << (BITS_PER_UNIT - this_time - next_bit));
5076 /* On little-endian machines,
5077 take first the least significant bits of the value
5078 and pack them starting at the least significant
5079 bits of the bytes. */
5080 shift = next_offset - byte_relative_ebitpos;
5082 /* Don't try to take a bunch of bits that cross
5083 the word boundary in the INTEGER_CST. We can
5084 only select bits from the LOW or HIGH part
5086 if (shift < HOST_BITS_PER_WIDE_INT
5087 && shift + this_time > HOST_BITS_PER_WIDE_INT)
5088 this_time = (HOST_BITS_PER_WIDE_INT - shift);
5090 /* Now get the bits from the appropriate constant word. */
5091 if (shift < HOST_BITS_PER_WIDE_INT)
5092 value = TREE_INT_CST_LOW (local->val);
5095 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
5096 value = TREE_INT_CST_HIGH (local->val);
5097 shift -= HOST_BITS_PER_WIDE_INT;
5100 /* Get the result. This works only when:
5101 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5102 local->byte |= (((value >> shift)
5103 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
5107 next_offset += this_time;
5108 local->byte_buffer_in_use = true;
5112 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5113 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5114 caller output state of relevance in recursive invocations. */
5116 static unsigned HOST_WIDE_INT
5117 output_constructor (tree exp, unsigned HOST_WIDE_INT size,
5118 unsigned int align, oc_outer_state * outer)
5120 unsigned HOST_WIDE_INT cnt;
5121 constructor_elt *ce;
5123 oc_local_state local;
5125 /* Setup our local state to communicate with helpers. */
5128 local.align = align;
5130 local.total_bytes = 0;
5131 local.byte_buffer_in_use = outer != NULL;
5132 local.byte = outer ? outer->byte : 0;
5134 local.type = TREE_TYPE (exp);
5136 local.last_relative_index = -1;
5138 local.min_index = NULL_TREE;
5139 if (TREE_CODE (local.type) == ARRAY_TYPE
5140 && TYPE_DOMAIN (local.type) != NULL_TREE)
5141 local.min_index = TYPE_MIN_VALUE (TYPE_DOMAIN (local.type));
5143 gcc_assert (HOST_BITS_PER_WIDE_INT >= BITS_PER_UNIT);
5145 /* As CE goes through the elements of the constant, FIELD goes through the
5146 structure fields if the constant is a structure. If the constant is a
5147 union, we override this by getting the field from the TREE_LIST element.
5148 But the constant could also be an array. Then FIELD is zero.
5150 There is always a maximum of one element in the chain LINK for unions
5151 (even if the initializer in a source program incorrectly contains
5154 local.field = NULL_TREE;
5155 if (TREE_CODE (local.type) == RECORD_TYPE)
5156 local.field = TYPE_FIELDS (local.type);
5159 VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (exp), cnt, ce);
5160 cnt++, local.field = local.field ? TREE_CHAIN (local.field) : 0)
5162 local.val = ce->value;
5163 local.index = NULL_TREE;
5165 /* The element in a union constructor specifies the proper field
5167 if ((TREE_CODE (local.type) == RECORD_TYPE
5168 || TREE_CODE (local.type) == UNION_TYPE
5169 || TREE_CODE (local.type) == QUAL_UNION_TYPE)
5170 && ce->index != NULL_TREE)
5171 local.field = ce->index;
5173 else if (TREE_CODE (local.type) == ARRAY_TYPE)
5174 local.index = ce->index;
5176 #ifdef ASM_COMMENT_START
5177 if (local.field && flag_verbose_asm)
5178 fprintf (asm_out_file, "%s %s:\n",
5180 DECL_NAME (local.field)
5181 ? IDENTIFIER_POINTER (DECL_NAME (local.field))
5185 /* Eliminate the marker that makes a cast not be an lvalue. */
5186 if (local.val != NULL_TREE)
5187 STRIP_NOPS (local.val);
5189 /* Output the current element, using the appropriate helper ... */
5191 /* For an array slice not part of an outer bitfield. */
5193 && local.index != NULL_TREE
5194 && TREE_CODE (local.index) == RANGE_EXPR)
5195 output_constructor_array_range (&local);
5197 /* For a field that is neither a true bitfield nor part of an outer one,
5198 known to be at least byte aligned and multiple-of-bytes long. */
5200 && (local.field == NULL_TREE
5201 || !CONSTRUCTOR_BITFIELD_P (local.field)))
5202 output_constructor_regular_field (&local);
5204 /* For a true bitfield or part of an outer one. */
5206 output_constructor_bitfield (&local, outer);
5209 /* If we are not at toplevel, save the pending data for our caller.
5210 Otherwise output the pending data and padding zeros as needed. */
5212 outer->byte = local.byte;
5215 if (local.byte_buffer_in_use)
5217 assemble_integer (GEN_INT (local.byte), 1, BITS_PER_UNIT, 1);
5218 local.total_bytes++;
5221 if ((unsigned HOST_WIDE_INT)local.total_bytes < local.size)
5223 assemble_zeros (local.size - local.total_bytes);
5224 local.total_bytes = local.size;
5228 return local.total_bytes;
5231 /* Mark DECL as weak. */
5234 mark_weak (tree decl)
5236 DECL_WEAK (decl) = 1;
5238 if (DECL_RTL_SET_P (decl)
5239 && MEM_P (DECL_RTL (decl))
5240 && XEXP (DECL_RTL (decl), 0)
5241 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == SYMBOL_REF)
5242 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl), 0)) = 1;
5245 /* Merge weak status between NEWDECL and OLDDECL. */
5248 merge_weak (tree newdecl, tree olddecl)
5250 if (DECL_WEAK (newdecl) == DECL_WEAK (olddecl))
5252 if (DECL_WEAK (newdecl) && SUPPORTS_WEAK)
5255 /* We put the NEWDECL on the weak_decls list at some point
5256 and OLDDECL as well. Keep just OLDDECL on the list. */
5257 for (pwd = &weak_decls; *pwd; pwd = &TREE_CHAIN (*pwd))
5258 if (TREE_VALUE (*pwd) == newdecl)
5260 *pwd = TREE_CHAIN (*pwd);
5267 if (DECL_WEAK (newdecl))
5271 /* NEWDECL is weak, but OLDDECL is not. */
5273 /* If we already output the OLDDECL, we're in trouble; we can't
5274 go back and make it weak. This error cannot be caught in
5275 declare_weak because the NEWDECL and OLDDECL was not yet
5276 been merged; therefore, TREE_ASM_WRITTEN was not set. */
5277 if (TREE_ASM_WRITTEN (olddecl))
5278 error ("weak declaration of %q+D must precede definition",
5281 /* If we've already generated rtl referencing OLDDECL, we may
5282 have done so in a way that will not function properly with
5284 else if (TREE_USED (olddecl)
5285 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl)))
5286 warning (0, "weak declaration of %q+D after first use results "
5287 "in unspecified behavior", newdecl);
5291 /* We put the NEWDECL on the weak_decls list at some point.
5292 Replace it with the OLDDECL. */
5293 for (wd = weak_decls; wd; wd = TREE_CHAIN (wd))
5294 if (TREE_VALUE (wd) == newdecl)
5296 TREE_VALUE (wd) = olddecl;
5299 /* We may not find the entry on the list. If NEWDECL is a
5300 weak alias, then we will have already called
5301 globalize_decl to remove the entry; in that case, we do
5302 not need to do anything. */
5305 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5306 mark_weak (olddecl);
5309 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5310 weak. Just update NEWDECL to indicate that it's weak too. */
5311 mark_weak (newdecl);
5314 /* Declare DECL to be a weak symbol. */
5317 declare_weak (tree decl)
5319 if (! TREE_PUBLIC (decl))
5320 error ("weak declaration of %q+D must be public", decl);
5321 else if (TREE_CODE (decl) == FUNCTION_DECL && TREE_ASM_WRITTEN (decl))
5322 error ("weak declaration of %q+D must precede definition", decl);
5323 else if (!SUPPORTS_WEAK)
5324 warning (0, "weak declaration of %q+D not supported", decl);
5327 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl)))
5328 DECL_ATTRIBUTES (decl)
5329 = tree_cons (get_identifier ("weak"), NULL, DECL_ATTRIBUTES (decl));
5333 weak_finish_1 (tree decl)
5335 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5336 const char *const name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5339 if (! TREE_USED (decl))
5342 #ifdef ASM_WEAKEN_DECL
5343 ASM_WEAKEN_DECL (asm_out_file, decl, name, NULL);
5345 #ifdef ASM_WEAKEN_LABEL
5346 ASM_WEAKEN_LABEL (asm_out_file, name);
5348 #ifdef ASM_OUTPUT_WEAK_ALIAS
5350 static bool warn_once = 0;
5353 warning (0, "only weak aliases are supported in this configuration");
5363 /* This TREE_LIST contains weakref targets. */
5365 static GTY(()) tree weakref_targets;
5367 /* Forward declaration. */
5368 static tree find_decl_and_mark_needed (tree decl, tree target);
5370 /* Emit any pending weak declarations. */
5377 for (t = weakref_targets; t; t = TREE_CHAIN (t))
5379 tree alias_decl = TREE_PURPOSE (t);
5380 tree target = ultimate_transparent_alias_target (&TREE_VALUE (t));
5382 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl)))
5383 /* Remove alias_decl from the weak list, but leave entries for
5384 the target alone. */
5386 #ifndef ASM_OUTPUT_WEAKREF
5387 else if (! TREE_SYMBOL_REFERENCED (target))
5389 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5390 defined, otherwise we and weak_finish_1 would use
5391 different macros. */
5392 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5393 ASM_WEAKEN_LABEL (asm_out_file, IDENTIFIER_POINTER (target));
5395 tree decl = find_decl_and_mark_needed (alias_decl, target);
5399 decl = build_decl (DECL_SOURCE_LOCATION (alias_decl),
5400 TREE_CODE (alias_decl), target,
5401 TREE_TYPE (alias_decl));
5403 DECL_EXTERNAL (decl) = 1;
5404 TREE_PUBLIC (decl) = 1;
5405 DECL_ARTIFICIAL (decl) = 1;
5406 TREE_NOTHROW (decl) = TREE_NOTHROW (alias_decl);
5407 TREE_USED (decl) = 1;
5410 weak_finish_1 (decl);
5419 /* Remove the alias and the target from the pending weak list
5420 so that we do not emit any .weak directives for the former,
5421 nor multiple .weak directives for the latter. */
5422 for (p = &weak_decls; (t2 = *p) ; )
5424 if (TREE_VALUE (t2) == alias_decl
5425 || target == DECL_ASSEMBLER_NAME (TREE_VALUE (t2)))
5426 *p = TREE_CHAIN (t2);
5428 p = &TREE_CHAIN (t2);
5431 /* Remove other weakrefs to the same target, to speed things up. */
5432 for (p = &TREE_CHAIN (t); (t2 = *p) ; )
5434 if (target == ultimate_transparent_alias_target (&TREE_VALUE (t2)))
5435 *p = TREE_CHAIN (t2);
5437 p = &TREE_CHAIN (t2);
5442 for (t = weak_decls; t; t = TREE_CHAIN (t))
5444 tree decl = TREE_VALUE (t);
5446 weak_finish_1 (decl);
5450 /* Emit the assembly bits to indicate that DECL is globally visible. */
5453 globalize_decl (tree decl)
5456 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5457 if (DECL_WEAK (decl))
5459 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
5462 #ifdef ASM_WEAKEN_DECL
5463 ASM_WEAKEN_DECL (asm_out_file, decl, name, 0);
5465 ASM_WEAKEN_LABEL (asm_out_file, name);
5468 /* Remove this function from the pending weak list so that
5469 we do not emit multiple .weak directives for it. */
5470 for (p = &weak_decls; (t = *p) ; )
5472 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
5473 *p = TREE_CHAIN (t);
5475 p = &TREE_CHAIN (t);
5478 /* Remove weakrefs to the same target from the pending weakref
5479 list, for the same reason. */
5480 for (p = &weakref_targets; (t = *p) ; )
5482 if (DECL_ASSEMBLER_NAME (decl)
5483 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
5484 *p = TREE_CHAIN (t);
5486 p = &TREE_CHAIN (t);
5493 targetm.asm_out.globalize_decl_name (asm_out_file, decl);
5496 VEC(alias_pair,gc) *alias_pairs;
5498 /* Given an assembly name, find the decl it is associated with. At the
5499 same time, mark it needed for cgraph. */
5502 find_decl_and_mark_needed (tree decl, tree target)
5504 struct cgraph_node *fnode = NULL;
5505 struct varpool_node *vnode = NULL;
5507 if (TREE_CODE (decl) == FUNCTION_DECL)
5509 fnode = cgraph_node_for_asm (target);
5511 vnode = varpool_node_for_asm (target);
5515 vnode = varpool_node_for_asm (target);
5517 fnode = cgraph_node_for_asm (target);
5522 cgraph_mark_needed_node (fnode);
5527 varpool_mark_needed_node (vnode);
5534 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5535 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5536 tree node is DECL to have the value of the tree node TARGET. */
5539 do_assemble_alias (tree decl, tree target)
5541 if (TREE_ASM_WRITTEN (decl))
5544 /* We must force creation of DECL_RTL for debug info generation, even though
5545 we don't use it here. */
5546 make_decl_rtl (decl);
5548 TREE_ASM_WRITTEN (decl) = 1;
5549 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl)) = 1;
5551 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
5553 ultimate_transparent_alias_target (&target);
5555 if (!targetm.have_tls
5556 && TREE_CODE (decl) == VAR_DECL
5557 && DECL_THREAD_LOCAL_P (decl))
5559 decl = emutls_decl (decl);
5560 target = get_emutls_object_name (target);
5563 if (!TREE_SYMBOL_REFERENCED (target))
5564 weakref_targets = tree_cons (decl, target, weakref_targets);
5566 #ifdef ASM_OUTPUT_WEAKREF
5567 ASM_OUTPUT_WEAKREF (asm_out_file, decl,
5568 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
5569 IDENTIFIER_POINTER (target));
5573 error_at (DECL_SOURCE_LOCATION (decl),
5574 "weakref is not supported in this configuration");
5581 if (!targetm.have_tls
5582 && TREE_CODE (decl) == VAR_DECL
5583 && DECL_THREAD_LOCAL_P (decl))
5585 decl = emutls_decl (decl);
5586 target = get_emutls_object_name (target);
5589 #ifdef ASM_OUTPUT_DEF
5590 /* Make name accessible from other files, if appropriate. */
5592 if (TREE_PUBLIC (decl))
5594 globalize_decl (decl);
5595 maybe_assemble_visibility (decl);
5598 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5599 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file, decl, target);
5601 ASM_OUTPUT_DEF (asm_out_file,
5602 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
5603 IDENTIFIER_POINTER (target));
5605 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5610 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5611 # ifdef ASM_WEAKEN_DECL
5612 ASM_WEAKEN_DECL (asm_out_file, decl, name, IDENTIFIER_POINTER (target));
5614 ASM_OUTPUT_WEAK_ALIAS (asm_out_file, name, IDENTIFIER_POINTER (target));
5616 /* Remove this function from the pending weak list so that
5617 we do not emit multiple .weak directives for it. */
5618 for (p = &weak_decls; (t = *p) ; )
5619 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
5620 *p = TREE_CHAIN (t);
5622 p = &TREE_CHAIN (t);
5624 /* Remove weakrefs to the same target from the pending weakref
5625 list, for the same reason. */
5626 for (p = &weakref_targets; (t = *p) ; )
5628 if (DECL_ASSEMBLER_NAME (decl)
5629 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
5630 *p = TREE_CHAIN (t);
5632 p = &TREE_CHAIN (t);
5639 /* Remove the alias pairing for functions that are no longer in the call
5643 remove_unreachable_alias_pairs (void)
5648 if (alias_pairs == NULL)
5651 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); )
5653 if (!DECL_EXTERNAL (p->decl))
5655 struct cgraph_node *fnode = NULL;
5656 struct varpool_node *vnode = NULL;
5657 fnode = cgraph_node_for_asm (p->target);
5658 vnode = (fnode == NULL) ? varpool_node_for_asm (p->target) : NULL;
5659 if (fnode == NULL && vnode == NULL)
5661 VEC_unordered_remove (alias_pair, alias_pairs, i);
5671 /* First pass of completing pending aliases. Make sure that cgraph knows
5672 which symbols will be required. */
5675 finish_aliases_1 (void)
5680 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); i++)
5684 target_decl = find_decl_and_mark_needed (p->decl, p->target);
5685 if (target_decl == NULL)
5687 if (! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
5688 error ("%q+D aliased to undefined symbol %qE",
5689 p->decl, p->target);
5691 else if (DECL_EXTERNAL (target_decl)
5692 /* We use local aliases for C++ thunks to force the tailcall
5693 to bind locally. Of course this is a hack - to keep it
5694 working do the following (which is not strictly correct). */
5695 && (! TREE_CODE (target_decl) == FUNCTION_DECL
5696 || ! DECL_VIRTUAL_P (target_decl))
5697 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
5698 error ("%q+D aliased to external symbol %qE",
5699 p->decl, p->target);
5703 /* Second pass of completing pending aliases. Emit the actual assembly.
5704 This happens at the end of compilation and thus it is assured that the
5705 target symbol has been emitted. */
5708 finish_aliases_2 (void)
5713 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); i++)
5714 do_assemble_alias (p->decl, p->target);
5716 VEC_truncate (alias_pair, alias_pairs, 0);
5719 /* Emit an assembler directive to make the symbol for DECL an alias to
5720 the symbol for TARGET. */
5723 assemble_alias (tree decl, tree target)
5726 bool is_weakref = false;
5728 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
5730 tree alias = DECL_ASSEMBLER_NAME (decl);
5734 ultimate_transparent_alias_target (&target);
5736 if (alias == target)
5737 error ("weakref %q+D ultimately targets itself", decl);
5740 #ifndef ASM_OUTPUT_WEAKREF
5741 IDENTIFIER_TRANSPARENT_ALIAS (alias) = 1;
5742 TREE_CHAIN (alias) = target;
5745 if (TREE_PUBLIC (decl))
5746 error ("weakref %q+D must have static linkage", decl);
5750 #if !defined (ASM_OUTPUT_DEF)
5751 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5752 error_at (DECL_SOURCE_LOCATION (decl),
5753 "alias definitions not supported in this configuration");
5756 if (!DECL_WEAK (decl))
5758 error_at (DECL_SOURCE_LOCATION (decl),
5759 "only weak aliases are supported in this configuration");
5765 TREE_USED (decl) = 1;
5767 /* A quirk of the initial implementation of aliases required that the user
5768 add "extern" to all of them. Which is silly, but now historical. Do
5769 note that the symbol is in fact locally defined. */
5771 DECL_EXTERNAL (decl) = 0;
5773 /* Allow aliases to aliases. */
5774 if (TREE_CODE (decl) == FUNCTION_DECL)
5775 cgraph_node (decl)->alias = true;
5777 varpool_node (decl)->alias = true;
5779 /* If the target has already been emitted, we don't have to queue the
5780 alias. This saves a tad of memory. */
5781 if (cgraph_global_info_ready)
5782 target_decl = find_decl_and_mark_needed (decl, target);
5785 if (target_decl && TREE_ASM_WRITTEN (target_decl))
5786 do_assemble_alias (decl, target);
5789 alias_pair *p = VEC_safe_push (alias_pair, gc, alias_pairs, NULL);
5795 /* Emit an assembler directive to set symbol for DECL visibility to
5796 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5799 default_assemble_visibility (tree decl, int vis)
5801 static const char * const visibility_types[] = {
5802 NULL, "protected", "hidden", "internal"
5805 const char *name, *type;
5807 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5808 type = visibility_types[vis];
5810 #ifdef HAVE_GAS_HIDDEN
5811 fprintf (asm_out_file, "\t.%s\t", type);
5812 assemble_name (asm_out_file, name);
5813 fprintf (asm_out_file, "\n");
5815 warning (OPT_Wattributes, "visibility attribute not supported "
5816 "in this configuration; ignored");
5820 /* A helper function to call assemble_visibility when needed for a decl. */
5823 maybe_assemble_visibility (tree decl)
5825 enum symbol_visibility vis = DECL_VISIBILITY (decl);
5827 if (vis != VISIBILITY_DEFAULT)
5829 targetm.asm_out.visibility (decl, vis);
5836 /* Returns 1 if the target configuration supports defining public symbols
5837 so that one of them will be chosen at link time instead of generating a
5838 multiply-defined symbol error, whether through the use of weak symbols or
5839 a target-specific mechanism for having duplicates discarded. */
5842 supports_one_only (void)
5844 if (SUPPORTS_ONE_ONLY)
5846 return SUPPORTS_WEAK;
5849 /* Set up DECL as a public symbol that can be defined in multiple
5850 translation units without generating a linker error. */
5853 make_decl_one_only (tree decl, tree comdat_group)
5855 gcc_assert (TREE_CODE (decl) == VAR_DECL
5856 || TREE_CODE (decl) == FUNCTION_DECL);
5858 TREE_PUBLIC (decl) = 1;
5860 if (SUPPORTS_ONE_ONLY)
5862 #ifdef MAKE_DECL_ONE_ONLY
5863 MAKE_DECL_ONE_ONLY (decl);
5865 DECL_COMDAT_GROUP (decl) = comdat_group;
5867 else if (TREE_CODE (decl) == VAR_DECL
5868 && (DECL_INITIAL (decl) == 0 || DECL_INITIAL (decl) == error_mark_node))
5869 DECL_COMMON (decl) = 1;
5872 gcc_assert (SUPPORTS_WEAK);
5873 DECL_WEAK (decl) = 1;
5878 init_varasm_once (void)
5880 section_htab = htab_create_ggc (31, section_entry_hash,
5881 section_entry_eq, NULL);
5882 object_block_htab = htab_create_ggc (31, object_block_entry_hash,
5883 object_block_entry_eq, NULL);
5884 const_desc_htab = htab_create_ggc (1009, const_desc_hash,
5885 const_desc_eq, NULL);
5887 const_alias_set = new_alias_set ();
5888 shared_constant_pool = create_constant_pool ();
5890 #ifdef TEXT_SECTION_ASM_OP
5891 text_section = get_unnamed_section (SECTION_CODE, output_section_asm_op,
5892 TEXT_SECTION_ASM_OP);
5895 #ifdef DATA_SECTION_ASM_OP
5896 data_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
5897 DATA_SECTION_ASM_OP);
5900 #ifdef SDATA_SECTION_ASM_OP
5901 sdata_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
5902 SDATA_SECTION_ASM_OP);
5905 #ifdef READONLY_DATA_SECTION_ASM_OP
5906 readonly_data_section = get_unnamed_section (0, output_section_asm_op,
5907 READONLY_DATA_SECTION_ASM_OP);
5910 #ifdef CTORS_SECTION_ASM_OP
5911 ctors_section = get_unnamed_section (0, output_section_asm_op,
5912 CTORS_SECTION_ASM_OP);
5915 #ifdef DTORS_SECTION_ASM_OP
5916 dtors_section = get_unnamed_section (0, output_section_asm_op,
5917 DTORS_SECTION_ASM_OP);
5920 #ifdef BSS_SECTION_ASM_OP
5921 bss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
5922 output_section_asm_op,
5923 BSS_SECTION_ASM_OP);
5926 #ifdef SBSS_SECTION_ASM_OP
5927 sbss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
5928 output_section_asm_op,
5929 SBSS_SECTION_ASM_OP);
5932 tls_comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5933 | SECTION_COMMON, emit_tls_common);
5934 lcomm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5935 | SECTION_COMMON, emit_local);
5936 comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5937 | SECTION_COMMON, emit_common);
5939 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
5940 bss_noswitch_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS,
5944 targetm.asm_out.init_sections ();
5946 if (readonly_data_section == NULL)
5947 readonly_data_section = text_section;
5951 decl_default_tls_model (const_tree decl)
5953 enum tls_model kind;
5956 is_local = targetm.binds_local_p (decl);
5960 kind = TLS_MODEL_LOCAL_EXEC;
5962 kind = TLS_MODEL_INITIAL_EXEC;
5965 /* Local dynamic is inefficient when we're not combining the
5966 parts of the address. */
5967 else if (optimize && is_local)
5968 kind = TLS_MODEL_LOCAL_DYNAMIC;
5970 kind = TLS_MODEL_GLOBAL_DYNAMIC;
5971 if (kind < flag_tls_default)
5972 kind = flag_tls_default;
5977 /* Select a set of attributes for section NAME based on the properties
5978 of DECL and whether or not RELOC indicates that DECL's initializer
5979 might contain runtime relocations.
5981 We make the section read-only and executable for a function decl,
5982 read-only for a const data decl, and writable for a non-const data decl. */
5985 default_section_type_flags (tree decl, const char *name, int reloc)
5989 if (decl && TREE_CODE (decl) == FUNCTION_DECL)
5990 flags = SECTION_CODE;
5991 else if (decl && decl_readonly_section (decl, reloc))
5993 else if (current_function_decl
5995 && crtl->subsections.unlikely_text_section_name
5996 && strcmp (name, crtl->subsections.unlikely_text_section_name) == 0)
5997 flags = SECTION_CODE;
5999 && (!current_function_decl || !cfun)
6000 && strcmp (name, UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
6001 flags = SECTION_CODE;
6003 flags = SECTION_WRITE;
6005 if (decl && DECL_ONE_ONLY (decl))
6006 flags |= SECTION_LINKONCE;
6008 if (decl && TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
6009 flags |= SECTION_TLS | SECTION_WRITE;
6011 if (strcmp (name, ".bss") == 0
6012 || strncmp (name, ".bss.", 5) == 0
6013 || strncmp (name, ".gnu.linkonce.b.", 16) == 0
6014 || strcmp (name, ".sbss") == 0
6015 || strncmp (name, ".sbss.", 6) == 0
6016 || strncmp (name, ".gnu.linkonce.sb.", 17) == 0)
6017 flags |= SECTION_BSS;
6019 if (strcmp (name, ".tdata") == 0
6020 || strncmp (name, ".tdata.", 7) == 0
6021 || strncmp (name, ".gnu.linkonce.td.", 17) == 0)
6022 flags |= SECTION_TLS;
6024 if (strcmp (name, ".tbss") == 0
6025 || strncmp (name, ".tbss.", 6) == 0
6026 || strncmp (name, ".gnu.linkonce.tb.", 17) == 0)
6027 flags |= SECTION_TLS | SECTION_BSS;
6029 /* These three sections have special ELF types. They are neither
6030 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6031 want to print a section type (@progbits or @nobits). If someone
6032 is silly enough to emit code or TLS variables to one of these
6033 sections, then don't handle them specially. */
6034 if (!(flags & (SECTION_CODE | SECTION_BSS | SECTION_TLS))
6035 && (strcmp (name, ".init_array") == 0
6036 || strcmp (name, ".fini_array") == 0
6037 || strcmp (name, ".preinit_array") == 0))
6038 flags |= SECTION_NOTYPE;
6043 /* Return true if the target supports some form of global BSS,
6044 either through bss_noswitch_section, or by selecting a BSS
6045 section in TARGET_ASM_SELECT_SECTION. */
6048 have_global_bss_p (void)
6050 return bss_noswitch_section || targetm.have_switchable_bss_sections;
6053 /* Output assembly to switch to section NAME with attribute FLAGS.
6054 Four variants for common object file formats. */
6057 default_no_named_section (const char *name ATTRIBUTE_UNUSED,
6058 unsigned int flags ATTRIBUTE_UNUSED,
6059 tree decl ATTRIBUTE_UNUSED)
6061 /* Some object formats don't support named sections at all. The
6062 front-end should already have flagged this as an error. */
6067 default_elf_asm_named_section (const char *name, unsigned int flags,
6068 tree decl ATTRIBUTE_UNUSED)
6070 char flagchars[10], *f = flagchars;
6072 /* If we have already declared this section, we can use an
6073 abbreviated form to switch back to it -- unless this section is
6074 part of a COMDAT groups, in which case GAS requires the full
6075 declaration every time. */
6076 if (!(HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
6077 && (flags & SECTION_DECLARED))
6079 fprintf (asm_out_file, "\t.section\t%s\n", name);
6083 if (!(flags & SECTION_DEBUG))
6085 if (flags & SECTION_WRITE)
6087 if (flags & SECTION_CODE)
6089 if (flags & SECTION_SMALL)
6091 if (flags & SECTION_MERGE)
6093 if (flags & SECTION_STRINGS)
6095 if (flags & SECTION_TLS)
6097 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
6101 fprintf (asm_out_file, "\t.section\t%s,\"%s\"", name, flagchars);
6103 if (!(flags & SECTION_NOTYPE))
6108 if (flags & SECTION_BSS)
6114 #ifdef ASM_COMMENT_START
6115 /* On platforms that use "@" as the assembly comment character,
6117 if (strcmp (ASM_COMMENT_START, "@") == 0)
6120 fprintf (asm_out_file, format, type);
6122 if (flags & SECTION_ENTSIZE)
6123 fprintf (asm_out_file, ",%d", flags & SECTION_ENTSIZE);
6124 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
6126 if (TREE_CODE (decl) == IDENTIFIER_NODE)
6127 fprintf (asm_out_file, ",%s,comdat", IDENTIFIER_POINTER (decl));
6129 fprintf (asm_out_file, ",%s,comdat",
6130 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl)));
6134 putc ('\n', asm_out_file);
6138 default_coff_asm_named_section (const char *name, unsigned int flags,
6139 tree decl ATTRIBUTE_UNUSED)
6141 char flagchars[8], *f = flagchars;
6143 if (flags & SECTION_WRITE)
6145 if (flags & SECTION_CODE)
6149 fprintf (asm_out_file, "\t.section\t%s,\"%s\"\n", name, flagchars);
6153 default_pe_asm_named_section (const char *name, unsigned int flags,
6156 default_coff_asm_named_section (name, flags, decl);
6158 if (flags & SECTION_LINKONCE)
6160 /* Functions may have been compiled at various levels of
6161 optimization so we can't use `same_size' here.
6162 Instead, have the linker pick one. */
6163 fprintf (asm_out_file, "\t.linkonce %s\n",
6164 (flags & SECTION_CODE ? "discard" : "same_size"));
6168 /* The lame default section selector. */
6171 default_select_section (tree decl, int reloc,
6172 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
6176 if (decl_readonly_section (decl, reloc))
6177 return readonly_data_section;
6179 else if (TREE_CODE (decl) == CONSTRUCTOR)
6181 if (! ((flag_pic && reloc)
6182 || !TREE_READONLY (decl)
6183 || TREE_SIDE_EFFECTS (decl)
6184 || !TREE_CONSTANT (decl)))
6185 return readonly_data_section;
6187 else if (TREE_CODE (decl) == STRING_CST)
6188 return readonly_data_section;
6189 else if (! (flag_pic && reloc))
6190 return readonly_data_section;
6192 return data_section;
6195 enum section_category
6196 categorize_decl_for_section (const_tree decl, int reloc)
6198 enum section_category ret;
6200 if (TREE_CODE (decl) == FUNCTION_DECL)
6202 else if (TREE_CODE (decl) == STRING_CST)
6204 if (flag_mudflap) /* or !flag_merge_constants */
6205 return SECCAT_RODATA;
6207 return SECCAT_RODATA_MERGE_STR;
6209 else if (TREE_CODE (decl) == VAR_DECL)
6211 if (bss_initializer_p (decl))
6213 else if (! TREE_READONLY (decl)
6214 || TREE_SIDE_EFFECTS (decl)
6215 || ! TREE_CONSTANT (DECL_INITIAL (decl)))
6217 /* Here the reloc_rw_mask is not testing whether the section should
6218 be read-only or not, but whether the dynamic link will have to
6219 do something. If so, we wish to segregate the data in order to
6220 minimize cache misses inside the dynamic linker. */
6221 if (reloc & targetm.asm_out.reloc_rw_mask ())
6222 ret = reloc == 1 ? SECCAT_DATA_REL_LOCAL : SECCAT_DATA_REL;
6226 else if (reloc & targetm.asm_out.reloc_rw_mask ())
6227 ret = reloc == 1 ? SECCAT_DATA_REL_RO_LOCAL : SECCAT_DATA_REL_RO;
6228 else if (reloc || flag_merge_constants < 2)
6229 /* C and C++ don't allow different variables to share the same
6230 location. -fmerge-all-constants allows even that (at the
6231 expense of not conforming). */
6232 ret = SECCAT_RODATA;
6233 else if (TREE_CODE (DECL_INITIAL (decl)) == STRING_CST)
6234 ret = SECCAT_RODATA_MERGE_STR_INIT;
6236 ret = SECCAT_RODATA_MERGE_CONST;
6238 else if (TREE_CODE (decl) == CONSTRUCTOR)
6240 if ((reloc & targetm.asm_out.reloc_rw_mask ())
6241 || TREE_SIDE_EFFECTS (decl)
6242 || ! TREE_CONSTANT (decl))
6245 ret = SECCAT_RODATA;
6248 ret = SECCAT_RODATA;
6250 /* There are no read-only thread-local sections. */
6251 if (TREE_CODE (decl) == VAR_DECL && DECL_TLS_MODEL (decl))
6253 if (DECL_TLS_MODEL (decl) == TLS_MODEL_EMULATED)
6255 if (DECL_EMUTLS_VAR_P (decl))
6257 if (targetm.emutls.var_section)
6258 ret = SECCAT_EMUTLS_VAR;
6262 if (targetm.emutls.tmpl_prefix)
6263 ret = SECCAT_EMUTLS_TMPL;
6266 /* Note that this would be *just* SECCAT_BSS, except that there's
6267 no concept of a read-only thread-local-data section. */
6268 else if (ret == SECCAT_BSS
6269 || (flag_zero_initialized_in_bss
6270 && initializer_zerop (DECL_INITIAL (decl))))
6276 /* If the target uses small data sections, select it. */
6277 else if (targetm.in_small_data_p (decl))
6279 if (ret == SECCAT_BSS)
6281 else if (targetm.have_srodata_section && ret == SECCAT_RODATA)
6282 ret = SECCAT_SRODATA;
6291 decl_readonly_section (const_tree decl, int reloc)
6293 switch (categorize_decl_for_section (decl, reloc))
6296 case SECCAT_RODATA_MERGE_STR:
6297 case SECCAT_RODATA_MERGE_STR_INIT:
6298 case SECCAT_RODATA_MERGE_CONST:
6299 case SECCAT_SRODATA:
6308 /* Select a section based on the above categorization. */
6311 default_elf_select_section (tree decl, int reloc,
6312 unsigned HOST_WIDE_INT align)
6315 switch (categorize_decl_for_section (decl, reloc))
6318 /* We're not supposed to be called on FUNCTION_DECLs. */
6321 return readonly_data_section;
6322 case SECCAT_RODATA_MERGE_STR:
6323 return mergeable_string_section (decl, align, 0);
6324 case SECCAT_RODATA_MERGE_STR_INIT:
6325 return mergeable_string_section (DECL_INITIAL (decl), align, 0);
6326 case SECCAT_RODATA_MERGE_CONST:
6327 return mergeable_constant_section (DECL_MODE (decl), align, 0);
6328 case SECCAT_SRODATA:
6332 return data_section;
6333 case SECCAT_DATA_REL:
6334 sname = ".data.rel";
6336 case SECCAT_DATA_REL_LOCAL:
6337 sname = ".data.rel.local";
6339 case SECCAT_DATA_REL_RO:
6340 sname = ".data.rel.ro";
6342 case SECCAT_DATA_REL_RO_LOCAL:
6343 sname = ".data.rel.ro.local";
6362 case SECCAT_EMUTLS_VAR:
6363 sname = targetm.emutls.var_section;
6365 case SECCAT_EMUTLS_TMPL:
6366 sname = targetm.emutls.tmpl_section;
6374 return get_named_section (decl, sname, reloc);
6377 /* Construct a unique section name based on the decl name and the
6378 categorization performed above. */
6381 default_unique_section (tree decl, int reloc)
6383 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6384 bool one_only = DECL_ONE_ONLY (decl) && !HAVE_COMDAT_GROUP;
6385 const char *prefix, *name, *linkonce;
6388 switch (categorize_decl_for_section (decl, reloc))
6391 prefix = one_only ? ".t" : ".text";
6394 case SECCAT_RODATA_MERGE_STR:
6395 case SECCAT_RODATA_MERGE_STR_INIT:
6396 case SECCAT_RODATA_MERGE_CONST:
6397 prefix = one_only ? ".r" : ".rodata";
6399 case SECCAT_SRODATA:
6400 prefix = one_only ? ".s2" : ".sdata2";
6403 prefix = one_only ? ".d" : ".data";
6405 case SECCAT_DATA_REL:
6406 prefix = one_only ? ".d.rel" : ".data.rel";
6408 case SECCAT_DATA_REL_LOCAL:
6409 prefix = one_only ? ".d.rel.local" : ".data.rel.local";
6411 case SECCAT_DATA_REL_RO:
6412 prefix = one_only ? ".d.rel.ro" : ".data.rel.ro";
6414 case SECCAT_DATA_REL_RO_LOCAL:
6415 prefix = one_only ? ".d.rel.ro.local" : ".data.rel.ro.local";
6418 prefix = one_only ? ".s" : ".sdata";
6421 prefix = one_only ? ".b" : ".bss";
6424 prefix = one_only ? ".sb" : ".sbss";
6427 prefix = one_only ? ".td" : ".tdata";
6430 prefix = one_only ? ".tb" : ".tbss";
6432 case SECCAT_EMUTLS_VAR:
6433 prefix = targetm.emutls.var_section;
6435 case SECCAT_EMUTLS_TMPL:
6436 prefix = targetm.emutls.tmpl_section;
6442 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
6443 name = targetm.strip_name_encoding (name);
6445 /* If we're using one_only, then there needs to be a .gnu.linkonce
6446 prefix to the section name. */
6447 linkonce = one_only ? ".gnu.linkonce" : "";
6449 string = ACONCAT ((linkonce, prefix, ".", name, NULL));
6451 DECL_SECTION_NAME (decl) = build_string (strlen (string), string);
6454 /* Like compute_reloc_for_constant, except for an RTX. The return value
6455 is a mask for which bit 1 indicates a global relocation, and bit 0
6456 indicates a local relocation. */
6459 compute_reloc_for_rtx_1 (rtx *xp, void *data)
6461 int *preloc = (int *) data;
6464 switch (GET_CODE (x))
6467 *preloc |= SYMBOL_REF_LOCAL_P (x) ? 1 : 2;
6480 compute_reloc_for_rtx (rtx x)
6484 switch (GET_CODE (x))
6490 for_each_rtx (&x, compute_reloc_for_rtx_1, &reloc);
6499 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED,
6501 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
6503 if (compute_reloc_for_rtx (x) & targetm.asm_out.reloc_rw_mask ())
6504 return data_section;
6506 return readonly_data_section;
6510 default_elf_select_rtx_section (enum machine_mode mode, rtx x,
6511 unsigned HOST_WIDE_INT align)
6513 int reloc = compute_reloc_for_rtx (x);
6515 /* ??? Handle small data here somehow. */
6517 if (reloc & targetm.asm_out.reloc_rw_mask ())
6520 return get_named_section (NULL, ".data.rel.ro.local", 1);
6522 return get_named_section (NULL, ".data.rel.ro", 3);
6525 return mergeable_constant_section (mode, align, 0);
6528 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6531 default_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
6536 /* Careful not to prod global register variables. */
6539 symbol = XEXP (rtl, 0);
6540 if (GET_CODE (symbol) != SYMBOL_REF)
6543 flags = SYMBOL_REF_FLAGS (symbol) & SYMBOL_FLAG_HAS_BLOCK_INFO;
6544 if (TREE_CODE (decl) == FUNCTION_DECL)
6545 flags |= SYMBOL_FLAG_FUNCTION;
6546 if (targetm.binds_local_p (decl))
6547 flags |= SYMBOL_FLAG_LOCAL;
6548 if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl)
6549 && DECL_TLS_MODEL (decl) != TLS_MODEL_EMULATED)
6550 flags |= DECL_TLS_MODEL (decl) << SYMBOL_FLAG_TLS_SHIFT;
6551 else if (targetm.in_small_data_p (decl))
6552 flags |= SYMBOL_FLAG_SMALL;
6553 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6554 being PUBLIC, the thing *must* be defined in this translation unit.
6555 Prevent this buglet from being propagated into rtl code as well. */
6556 if (DECL_P (decl) && DECL_EXTERNAL (decl) && TREE_PUBLIC (decl))
6557 flags |= SYMBOL_FLAG_EXTERNAL;
6559 SYMBOL_REF_FLAGS (symbol) = flags;
6562 /* By default, we do nothing for encode_section_info, so we need not
6563 do anything but discard the '*' marker. */
6566 default_strip_name_encoding (const char *str)
6568 return str + (*str == '*');
6571 #ifdef ASM_OUTPUT_DEF
6572 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6573 anchor relative to ".", the current section position. */
6576 default_asm_output_anchor (rtx symbol)
6580 sprintf (buffer, "*. + " HOST_WIDE_INT_PRINT_DEC,
6581 SYMBOL_REF_BLOCK_OFFSET (symbol));
6582 ASM_OUTPUT_DEF (asm_out_file, XSTR (symbol, 0), buffer);
6586 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6589 default_use_anchors_for_symbol_p (const_rtx symbol)
6594 /* Don't use anchors for mergeable sections. The linker might move
6595 the objects around. */
6596 sect = SYMBOL_REF_BLOCK (symbol)->sect;
6597 if (sect->common.flags & SECTION_MERGE)
6600 /* Don't use anchors for small data sections. The small data register
6601 acts as an anchor for such sections. */
6602 if (sect->common.flags & SECTION_SMALL)
6605 decl = SYMBOL_REF_DECL (symbol);
6606 if (decl && DECL_P (decl))
6608 /* Don't use section anchors for decls that might be defined by
6610 if (!targetm.binds_local_p (decl))
6613 /* Don't use section anchors for decls that will be placed in a
6614 small data section. */
6615 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6616 one above. The problem is that we only use SECTION_SMALL for
6617 sections that should be marked as small in the section directive. */
6618 if (targetm.in_small_data_p (decl))
6624 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6625 wrt cross-module name binding. */
6628 default_binds_local_p (const_tree exp)
6630 return default_binds_local_p_1 (exp, flag_shlib);
6634 default_binds_local_p_1 (const_tree exp, int shlib)
6638 /* A non-decl is an entry in the constant pool. */
6641 /* Weakrefs may not bind locally, even though the weakref itself is
6642 always static and therefore local. */
6643 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp)))
6645 /* Static variables are always local. */
6646 else if (! TREE_PUBLIC (exp))
6648 /* A variable is local if the user has said explicitly that it will
6650 else if (DECL_VISIBILITY_SPECIFIED (exp)
6651 && DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
6653 /* Variables defined outside this object might not be local. */
6654 else if (DECL_EXTERNAL (exp))
6656 /* If defined in this object and visibility is not default, must be
6658 else if (DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
6660 /* Default visibility weak data can be overridden by a strong symbol
6661 in another module and so are not local. */
6662 else if (DECL_WEAK (exp))
6664 /* If PIC, then assume that any global name can be overridden by
6665 symbols resolved from other modules, unless we are compiling with
6666 -fwhole-program, which assumes that names are local. */
6668 local_p = flag_whole_program;
6669 /* Uninitialized COMMON variable may be unified with symbols
6670 resolved from other modules. */
6671 else if (DECL_COMMON (exp)
6672 && (DECL_INITIAL (exp) == NULL
6673 || DECL_INITIAL (exp) == error_mark_node))
6675 /* Otherwise we're left with initialized (or non-common) global data
6676 which is of necessity defined locally. */
6683 /* Default function to output code that will globalize a label. A
6684 target must define GLOBAL_ASM_OP or provide its own function to
6685 globalize a label. */
6686 #ifdef GLOBAL_ASM_OP
6688 default_globalize_label (FILE * stream, const char *name)
6690 fputs (GLOBAL_ASM_OP, stream);
6691 assemble_name (stream, name);
6692 putc ('\n', stream);
6694 #endif /* GLOBAL_ASM_OP */
6696 /* Default function to output code that will globalize a declaration. */
6698 default_globalize_decl_name (FILE * stream, tree decl)
6700 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
6701 targetm.asm_out.globalize_label (stream, name);
6704 /* Default function to output a label for unwind information. The
6705 default is to do nothing. A target that needs nonlocal labels for
6706 unwind information must provide its own function to do this. */
6708 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED,
6709 tree decl ATTRIBUTE_UNUSED,
6710 int for_eh ATTRIBUTE_UNUSED,
6711 int empty ATTRIBUTE_UNUSED)
6715 /* Default function to output a label to divide up the exception table.
6716 The default is to do nothing. A target that needs/wants to divide
6717 up the table must provide it's own function to do this. */
6719 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED)
6723 /* This is how to output an internal numbered label where PREFIX is
6724 the class of label and LABELNO is the number within the class. */
6727 default_internal_label (FILE *stream, const char *prefix,
6728 unsigned long labelno)
6730 char *const buf = (char *) alloca (40 + strlen (prefix));
6731 ASM_GENERATE_INTERNAL_LABEL (buf, prefix, labelno);
6732 ASM_OUTPUT_INTERNAL_LABEL (stream, buf);
6735 /* This is the default behavior at the beginning of a file. It's
6736 controlled by two other target-hook toggles. */
6738 default_file_start (void)
6740 if (targetm.file_start_app_off
6741 && !(flag_verbose_asm || flag_debug_asm || flag_dump_rtl_in_asm))
6742 fputs (ASM_APP_OFF, asm_out_file);
6744 if (targetm.file_start_file_directive)
6745 output_file_directive (asm_out_file, main_input_filename);
6748 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6749 which emits a special section directive used to indicate whether or
6750 not this object file needs an executable stack. This is primarily
6751 a GNU extension to ELF but could be used on other targets. */
6753 int trampolines_created;
6756 file_end_indicate_exec_stack (void)
6758 unsigned int flags = SECTION_DEBUG;
6759 if (trampolines_created)
6760 flags |= SECTION_CODE;
6762 switch_to_section (get_section (".note.GNU-stack", flags, NULL));
6765 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6766 a get_unnamed_section callback. */
6769 output_section_asm_op (const void *directive)
6771 fprintf (asm_out_file, "%s\n", (const char *) directive);
6774 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6775 the current section is NEW_SECTION. */
6778 switch_to_section (section *new_section)
6780 if (in_section == new_section)
6783 if (new_section->common.flags & SECTION_FORGET)
6786 in_section = new_section;
6788 switch (SECTION_STYLE (new_section))
6792 && !crtl->subsections.unlikely_text_section_name
6793 && strcmp (new_section->named.name,
6794 UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
6795 crtl->subsections.unlikely_text_section_name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
6797 targetm.asm_out.named_section (new_section->named.name,
6798 new_section->named.common.flags,
6799 new_section->named.decl);
6802 case SECTION_UNNAMED:
6803 new_section->unnamed.callback (new_section->unnamed.data);
6806 case SECTION_NOSWITCH:
6811 new_section->common.flags |= SECTION_DECLARED;
6814 /* If block symbol SYMBOL has not yet been assigned an offset, place
6815 it at the end of its block. */
6818 place_block_symbol (rtx symbol)
6820 unsigned HOST_WIDE_INT size, mask, offset;
6821 struct constant_descriptor_rtx *desc;
6822 unsigned int alignment;
6823 struct object_block *block;
6826 gcc_assert (SYMBOL_REF_BLOCK (symbol));
6827 if (SYMBOL_REF_BLOCK_OFFSET (symbol) >= 0)
6830 /* Work out the symbol's size and alignment. */
6831 if (CONSTANT_POOL_ADDRESS_P (symbol))
6833 desc = SYMBOL_REF_CONSTANT (symbol);
6834 alignment = desc->align;
6835 size = GET_MODE_SIZE (desc->mode);
6837 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
6839 decl = SYMBOL_REF_DECL (symbol);
6840 alignment = get_constant_alignment (decl);
6841 size = get_constant_size (decl);
6845 decl = SYMBOL_REF_DECL (symbol);
6846 alignment = DECL_ALIGN (decl);
6847 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
6850 /* Calculate the object's offset from the start of the block. */
6851 block = SYMBOL_REF_BLOCK (symbol);
6852 mask = alignment / BITS_PER_UNIT - 1;
6853 offset = (block->size + mask) & ~mask;
6854 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
6856 /* Record the block's new alignment and size. */
6857 block->alignment = MAX (block->alignment, alignment);
6858 block->size = offset + size;
6860 VEC_safe_push (rtx, gc, block->objects, symbol);
6863 /* Return the anchor that should be used to address byte offset OFFSET
6864 from the first object in BLOCK. MODEL is the TLS model used
6868 get_section_anchor (struct object_block *block, HOST_WIDE_INT offset,
6869 enum tls_model model)
6872 unsigned int begin, middle, end;
6873 unsigned HOST_WIDE_INT min_offset, max_offset, range, bias, delta;
6876 /* Work out the anchor's offset. Use an offset of 0 for the first
6877 anchor so that we don't pessimize the case where we take the address
6878 of a variable at the beginning of the block. This is particularly
6879 useful when a block has only one variable assigned to it.
6881 We try to place anchors RANGE bytes apart, so there can then be
6882 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
6883 a ptr_mode offset. With some target settings, the lowest such
6884 anchor might be out of range for the lowest ptr_mode offset;
6885 likewise the highest anchor for the highest offset. Use anchors
6886 at the extreme ends of the ptr_mode range in such cases.
6888 All arithmetic uses unsigned integers in order to avoid
6890 max_offset = (unsigned HOST_WIDE_INT) targetm.max_anchor_offset;
6891 min_offset = (unsigned HOST_WIDE_INT) targetm.min_anchor_offset;
6892 range = max_offset - min_offset + 1;
6897 bias = 1 << (GET_MODE_BITSIZE (ptr_mode) - 1);
6900 delta = -(unsigned HOST_WIDE_INT) offset + max_offset;
6901 delta -= delta % range;
6904 offset = (HOST_WIDE_INT) (-delta);
6908 delta = (unsigned HOST_WIDE_INT) offset - min_offset;
6909 delta -= delta % range;
6910 if (delta > bias - 1)
6912 offset = (HOST_WIDE_INT) delta;
6916 /* Do a binary search to see if there's already an anchor we can use.
6917 Set BEGIN to the new anchor's index if not. */
6919 end = VEC_length (rtx, block->anchors);
6920 while (begin != end)
6922 middle = (end + begin) / 2;
6923 anchor = VEC_index (rtx, block->anchors, middle);
6924 if (SYMBOL_REF_BLOCK_OFFSET (anchor) > offset)
6926 else if (SYMBOL_REF_BLOCK_OFFSET (anchor) < offset)
6928 else if (SYMBOL_REF_TLS_MODEL (anchor) > model)
6930 else if (SYMBOL_REF_TLS_MODEL (anchor) < model)
6936 /* Create a new anchor with a unique label. */
6937 ASM_GENERATE_INTERNAL_LABEL (label, "LANCHOR", anchor_labelno++);
6938 anchor = create_block_symbol (ggc_strdup (label), block, offset);
6939 SYMBOL_REF_FLAGS (anchor) |= SYMBOL_FLAG_LOCAL | SYMBOL_FLAG_ANCHOR;
6940 SYMBOL_REF_FLAGS (anchor) |= model << SYMBOL_FLAG_TLS_SHIFT;
6942 /* Insert it at index BEGIN. */
6943 VEC_safe_insert (rtx, gc, block->anchors, begin, anchor);
6947 /* Output the objects in BLOCK. */
6950 output_object_block (struct object_block *block)
6952 struct constant_descriptor_rtx *desc;
6954 HOST_WIDE_INT offset;
6958 if (block->objects == NULL)
6961 /* Switch to the section and make sure that the first byte is
6962 suitably aligned. */
6963 switch_to_section (block->sect);
6964 assemble_align (block->alignment);
6966 /* Define the values of all anchors relative to the current section
6968 for (i = 0; VEC_iterate (rtx, block->anchors, i, symbol); i++)
6969 targetm.asm_out.output_anchor (symbol);
6971 /* Output the objects themselves. */
6973 for (i = 0; VEC_iterate (rtx, block->objects, i, symbol); i++)
6975 /* Move to the object's offset, padding with zeros if necessary. */
6976 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol) - offset);
6977 offset = SYMBOL_REF_BLOCK_OFFSET (symbol);
6978 if (CONSTANT_POOL_ADDRESS_P (symbol))
6980 desc = SYMBOL_REF_CONSTANT (symbol);
6981 output_constant_pool_1 (desc, 1);
6982 offset += GET_MODE_SIZE (desc->mode);
6984 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
6986 decl = SYMBOL_REF_DECL (symbol);
6987 assemble_constant_contents (decl, XSTR (symbol, 0),
6988 get_constant_alignment (decl));
6989 offset += get_constant_size (decl);
6993 decl = SYMBOL_REF_DECL (symbol);
6994 assemble_variable_contents (decl, XSTR (symbol, 0), false);
6995 offset += tree_low_cst (DECL_SIZE_UNIT (decl), 1);
7000 /* A htab_traverse callback used to call output_object_block for
7001 each member of object_block_htab. */
7004 output_object_block_htab (void **slot, void *data ATTRIBUTE_UNUSED)
7006 output_object_block ((struct object_block *) (*slot));
7010 /* Output the definitions of all object_blocks. */
7013 output_object_blocks (void)
7015 htab_traverse (object_block_htab, output_object_block_htab, NULL);
7018 /* This function provides a possible implementation of the
7019 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7020 by -frecord-gcc-switches it creates a new mergeable, string section in the
7021 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7022 contains the switches in ASCII format.
7024 FIXME: This code does not correctly handle double quote characters
7025 that appear inside strings, (it strips them rather than preserving them).
7026 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7027 characters - instead it treats them as sub-string separators. Since
7028 we want to emit NUL strings terminators into the object file we have to use
7032 elf_record_gcc_switches (print_switch_type type, const char * name)
7034 static char buffer[1024];
7036 /* This variable is used as part of a simplistic heuristic to detect
7037 command line switches which take an argument:
7039 "If a command line option does not start with a dash then
7040 it is an argument for the previous command line option."
7042 This fails in the case of the command line option which is the name
7043 of the file to compile, but otherwise it is pretty reasonable. */
7044 static bool previous_name_held_back = FALSE;
7048 case SWITCH_TYPE_PASSED:
7051 if (previous_name_held_back)
7053 unsigned int len = strlen (buffer);
7055 snprintf (buffer + len, sizeof buffer - len, " %s", name);
7056 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
7057 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
7058 previous_name_held_back = FALSE;
7062 strncpy (buffer, name, sizeof buffer);
7063 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
7064 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
7069 if (previous_name_held_back)
7071 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
7072 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
7075 strncpy (buffer, name, sizeof buffer);
7076 previous_name_held_back = TRUE;
7080 case SWITCH_TYPE_DESCRIPTIVE:
7083 /* Distinguish between invocations where name is NULL. */
7084 static bool started = false;
7088 if (previous_name_held_back)
7090 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
7091 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
7098 sec = get_section (targetm.asm_out.record_gcc_switches_section,
7102 | (SECTION_ENTSIZE & 1),
7104 switch_to_section (sec);
7113 /* The return value is currently ignored by the caller, but must be 0.
7114 For -fverbose-asm the return value would be the number of characters
7115 emitted into the assembler file. */
7119 /* Emit text to declare externally defined symbols. It is needed to
7120 properly support non-default visibility. */
7122 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED,
7124 const char *name ATTRIBUTE_UNUSED)
7126 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7127 set in order to avoid putting out names that are never really
7129 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
7130 && targetm.binds_local_p (decl))
7131 maybe_assemble_visibility (decl);
7134 #include "gt-varasm.h"