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"
47 #include "langhooks.h"
51 #include "targhooks.h"
52 #include "tree-mudflap.h"
54 #include "cfglayout.h"
55 #include "basic-block.h"
56 #include "tree-iterator.h"
58 #ifdef XCOFF_DEBUGGING_INFO
59 #include "xcoffout.h" /* Needed for external data
60 declarations for e.g. AIX 4.x. */
63 /* The (assembler) name of the first globally-visible object output. */
64 extern GTY(()) const char *first_global_object_name;
65 extern GTY(()) const char *weak_global_object_name;
67 const char *first_global_object_name;
68 const char *weak_global_object_name;
71 struct constant_descriptor_rtx;
72 struct rtx_constant_pool;
74 #define n_deferred_constants (crtl->varasm.deferred_constants)
76 /* Number for making the label on the next
77 constant that is stored in memory. */
79 static GTY(()) int const_labelno;
81 /* Carry information from ASM_DECLARE_OBJECT_NAME
82 to ASM_FINISH_DECLARE_OBJECT. */
84 int size_directive_output;
86 /* The last decl for which assemble_variable was called,
87 if it did ASM_DECLARE_OBJECT_NAME.
88 If the last call to assemble_variable didn't do that,
91 tree last_assemble_variable_decl;
93 /* The following global variable indicates if the first basic block
94 in a function belongs to the cold partition or not. */
96 bool first_function_block_is_cold;
98 /* We give all constants their own alias set. Perhaps redundant with
99 MEM_READONLY_P, but pre-dates it. */
101 static alias_set_type const_alias_set;
103 static const char *strip_reg_name (const char *);
104 static int contains_pointers_p (tree);
105 #ifdef ASM_OUTPUT_EXTERNAL
106 static bool incorporeal_function_p (tree);
108 static void decode_addr_const (tree, struct addr_const *);
109 static hashval_t const_desc_hash (const void *);
110 static int const_desc_eq (const void *, const void *);
111 static hashval_t const_hash_1 (const tree);
112 static int compare_constant (const tree, const tree);
113 static tree copy_constant (tree);
114 static void output_constant_def_contents (rtx);
115 static void output_addressed_constants (tree);
116 static unsigned HOST_WIDE_INT array_size_for_constructor (tree);
117 static unsigned min_align (unsigned, unsigned);
118 static void output_constructor (tree, unsigned HOST_WIDE_INT, unsigned int);
119 static void globalize_decl (tree);
120 #ifdef BSS_SECTION_ASM_OP
121 #ifdef ASM_OUTPUT_BSS
122 static void asm_output_bss (FILE *, tree, const char *,
123 unsigned HOST_WIDE_INT, unsigned HOST_WIDE_INT);
125 #ifdef ASM_OUTPUT_ALIGNED_BSS
126 static void asm_output_aligned_bss (FILE *, tree, const char *,
127 unsigned HOST_WIDE_INT, int)
130 #endif /* BSS_SECTION_ASM_OP */
131 static void mark_weak (tree);
132 static void output_constant_pool (const char *, tree);
134 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
135 section *text_section;
136 section *data_section;
137 section *readonly_data_section;
138 section *sdata_section;
139 section *ctors_section;
140 section *dtors_section;
141 section *bss_section;
142 section *sbss_section;
144 /* Various forms of common section. All are guaranteed to be nonnull. */
145 section *tls_comm_section;
146 section *comm_section;
147 section *lcomm_section;
149 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
151 section *bss_noswitch_section;
153 /* The section that holds the main exception table, when known. The section
154 is set either by the target's init_sections hook or by the first call to
155 switch_to_exception_section. */
156 section *exception_section;
158 /* The section that holds the DWARF2 frame unwind information, when known.
159 The section is set either by the target's init_sections hook or by the
160 first call to switch_to_eh_frame_section. */
161 section *eh_frame_section;
163 /* asm_out_file's current section. This is NULL if no section has yet
164 been selected or if we lose track of what the current section is. */
167 /* True if code for the current function is currently being directed
168 at the cold section. */
169 bool in_cold_section_p;
171 /* A linked list of all the unnamed sections. */
172 static GTY(()) section *unnamed_sections;
174 /* Return a nonzero value if DECL has a section attribute. */
175 #ifndef IN_NAMED_SECTION
176 #define IN_NAMED_SECTION(DECL) \
177 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
178 && DECL_SECTION_NAME (DECL) != NULL_TREE)
181 /* Hash table of named sections. */
182 static GTY((param_is (section))) htab_t section_htab;
184 /* A table of object_blocks, indexed by section. */
185 static GTY((param_is (struct object_block))) htab_t object_block_htab;
187 /* The next number to use for internal anchor labels. */
188 static GTY(()) int anchor_labelno;
190 /* A pool of constants that can be shared between functions. */
191 static GTY(()) struct rtx_constant_pool *shared_constant_pool;
195 static GTY ((if_marked ("tree_map_marked_p"), param_is (struct tree_map)))
197 static GTY (()) tree emutls_object_type;
198 /* Emulated TLS objects have the TLS model TLS_MODEL_EMULATED. This
199 macro can be used on them to distinguish the control variable from
200 the initialization template. */
201 #define DECL_EMUTLS_VAR_P(D) (TREE_TYPE (D) == emutls_object_type)
203 #if !defined (NO_DOT_IN_LABEL)
204 # define EMUTLS_SEPARATOR "."
205 #elif !defined (NO_DOLLAR_IN_LABEL)
206 # define EMUTLS_SEPARATOR "$"
208 # define EMUTLS_SEPARATOR "_"
211 /* Create an IDENTIFIER_NODE by prefixing PREFIX to the
212 IDENTIFIER_NODE NAME's name. */
215 prefix_name (const char *prefix, tree name)
217 unsigned plen = strlen (prefix);
218 unsigned nlen = strlen (IDENTIFIER_POINTER (name));
219 char *toname = (char *) alloca (plen + nlen + 1);
221 memcpy (toname, prefix, plen);
222 memcpy (toname + plen, IDENTIFIER_POINTER (name), nlen + 1);
224 return get_identifier (toname);
227 /* Create an identifier for the struct __emutls_object, given an identifier
228 of the DECL_ASSEMBLY_NAME of the original object. */
231 get_emutls_object_name (tree name)
233 const char *prefix = (targetm.emutls.var_prefix
234 ? targetm.emutls.var_prefix
235 : "__emutls_v" EMUTLS_SEPARATOR);
236 return prefix_name (prefix, name);
240 default_emutls_var_fields (tree type, tree *name ATTRIBUTE_UNUSED)
242 tree word_type_node, field, next_field;
244 field = build_decl (FIELD_DECL, get_identifier ("__templ"), ptr_type_node);
245 DECL_CONTEXT (field) = type;
248 field = build_decl (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 (FIELD_DECL, get_identifier ("__align"),
257 DECL_CONTEXT (field) = type;
258 TREE_CHAIN (field) = next_field;
261 field = build_decl (FIELD_DECL, get_identifier ("__size"), word_type_node);
262 DECL_CONTEXT (field) = type;
263 TREE_CHAIN (field) = next_field;
268 /* Create the structure for struct __emutls_object. This should match the
269 structure at the top of emutls.c, modulo the union there. */
272 get_emutls_object_type (void)
274 tree type, type_name, field;
276 type = emutls_object_type;
280 emutls_object_type = type = lang_hooks.types.make_type (RECORD_TYPE);
282 field = targetm.emutls.var_fields (type, &type_name);
284 type_name = get_identifier ("__emutls_object");
285 type_name = build_decl (TYPE_DECL, type_name, type);
286 TYPE_NAME (type) = type_name;
287 TYPE_FIELDS (type) = field;
293 /* Create a read-only variable like DECL, with the same DECL_INITIAL.
294 This will be used for initializing the emulated tls data area. */
297 get_emutls_init_templ_addr (tree decl)
301 if (targetm.emutls.register_common && !DECL_INITIAL (decl)
302 && !DECL_SECTION_NAME (decl))
303 return null_pointer_node;
305 name = DECL_ASSEMBLER_NAME (decl);
306 if (!targetm.emutls.tmpl_prefix || targetm.emutls.tmpl_prefix[0])
308 const char *prefix = (targetm.emutls.tmpl_prefix
309 ? targetm.emutls.tmpl_prefix
310 : "__emutls_t" EMUTLS_SEPARATOR);
311 name = prefix_name (prefix, name);
314 to = build_decl (VAR_DECL, name, TREE_TYPE (decl));
315 SET_DECL_ASSEMBLER_NAME (to, DECL_NAME (to));
316 DECL_TLS_MODEL (to) = TLS_MODEL_EMULATED;
317 DECL_ARTIFICIAL (to) = 1;
318 TREE_USED (to) = TREE_USED (decl);
319 TREE_READONLY (to) = 1;
320 DECL_IGNORED_P (to) = 1;
321 DECL_CONTEXT (to) = DECL_CONTEXT (decl);
322 DECL_SECTION_NAME (to) = DECL_SECTION_NAME (decl);
324 DECL_WEAK (to) = DECL_WEAK (decl);
325 if (DECL_ONE_ONLY (decl))
327 make_decl_one_only (to);
328 TREE_STATIC (to) = TREE_STATIC (decl);
329 TREE_PUBLIC (to) = TREE_PUBLIC (decl);
330 DECL_VISIBILITY (to) = DECL_VISIBILITY (decl);
333 TREE_STATIC (to) = 1;
335 DECL_INITIAL (to) = DECL_INITIAL (decl);
336 DECL_INITIAL (decl) = NULL;
338 varpool_finalize_decl (to);
339 return build_fold_addr_expr (to);
342 /* When emulating tls, we use a control structure for use by the runtime.
343 Create and return this structure. */
346 emutls_decl (tree decl)
349 struct tree_map *h, in;
352 if (targetm.have_tls || decl == NULL || decl == error_mark_node
353 || TREE_CODE (decl) != VAR_DECL || ! DECL_THREAD_LOCAL_P (decl))
356 /* Look up the object in the hash; return the control structure if
357 it has already been created. */
359 emutls_htab = htab_create_ggc (512, tree_map_hash, tree_map_eq, 0);
361 name = DECL_ASSEMBLER_NAME (decl);
363 /* Note that we use the hash of the decl's name, rather than a hash
364 of the decl's pointer. In emutls_finish we iterate through the
365 hash table, and we want this traversal to be predictable. */
366 in.hash = htab_hash_string (IDENTIFIER_POINTER (name));
368 loc = htab_find_slot_with_hash (emutls_htab, &in, in.hash, INSERT);
369 h = (struct tree_map *) *loc;
374 to = build_decl (VAR_DECL, get_emutls_object_name (name),
375 get_emutls_object_type ());
377 h = GGC_NEW (struct tree_map);
381 *(struct tree_map **) loc = h;
383 DECL_TLS_MODEL (to) = TLS_MODEL_EMULATED;
384 DECL_ARTIFICIAL (to) = 1;
385 DECL_IGNORED_P (to) = 1;
386 TREE_READONLY (to) = 0;
387 SET_DECL_ASSEMBLER_NAME (to, DECL_NAME (to));
388 if (DECL_ONE_ONLY (decl))
389 make_decl_one_only (to);
390 DECL_CONTEXT (to) = DECL_CONTEXT (decl);
391 if (targetm.emutls.var_align_fixed)
392 /* If we're not allowed to change the proxy object's
393 alignment, pretend it's been set by the user. */
394 DECL_USER_ALIGN (to) = 1;
397 /* Note that these fields may need to be updated from time to time from
398 the original decl. Consider:
399 extern __thread int i;
400 int foo() { return i; }
402 in which I goes from external to locally defined and initialized. */
404 TREE_STATIC (to) = TREE_STATIC (decl);
405 TREE_USED (to) = TREE_USED (decl);
406 TREE_PUBLIC (to) = TREE_PUBLIC (decl);
407 DECL_EXTERNAL (to) = DECL_EXTERNAL (decl);
408 DECL_COMMON (to) = DECL_COMMON (decl);
409 DECL_WEAK (to) = DECL_WEAK (decl);
410 DECL_VISIBILITY (to) = DECL_VISIBILITY (decl);
416 emutls_common_1 (void **loc, void *xstmts)
418 struct tree_map *h = *(struct tree_map **) loc;
419 tree args, x, *pstmts = (tree *) xstmts;
422 if (! DECL_COMMON (h->base.from)
423 || (DECL_INITIAL (h->base.from)
424 && DECL_INITIAL (h->base.from) != error_mark_node))
427 word_type_node = lang_hooks.types.type_for_mode (word_mode, 1);
429 /* The idea was to call get_emutls_init_templ_addr here, but if we
430 do this and there is an initializer, -fanchor_section loses,
431 because it would be too late to ensure the template is
433 x = null_pointer_node;
434 args = tree_cons (NULL, x, NULL);
435 x = build_int_cst (word_type_node, DECL_ALIGN_UNIT (h->base.from));
436 args = tree_cons (NULL, x, args);
437 x = fold_convert (word_type_node, DECL_SIZE_UNIT (h->base.from));
438 args = tree_cons (NULL, x, args);
439 x = build_fold_addr_expr (h->to);
440 args = tree_cons (NULL, x, args);
442 x = built_in_decls[BUILT_IN_EMUTLS_REGISTER_COMMON];
443 x = build_function_call_expr (x, args);
445 append_to_statement_list (x, pstmts);
452 if (targetm.emutls.register_common)
454 tree body = NULL_TREE;
456 if (emutls_htab == NULL)
459 htab_traverse_noresize (emutls_htab, emutls_common_1, &body);
460 if (body == NULL_TREE)
463 cgraph_build_static_cdtor ('I', body, DEFAULT_INIT_PRIORITY);
467 /* Helper routines for maintaining section_htab. */
470 section_entry_eq (const void *p1, const void *p2)
472 const section *old = (const section *) p1;
473 const char *new_name = (const char *) p2;
475 return strcmp (old->named.name, new_name) == 0;
479 section_entry_hash (const void *p)
481 const section *old = (const section *) p;
482 return htab_hash_string (old->named.name);
485 /* Return a hash value for section SECT. */
488 hash_section (section *sect)
490 if (sect->common.flags & SECTION_NAMED)
491 return htab_hash_string (sect->named.name);
492 return sect->common.flags;
495 /* Helper routines for maintaining object_block_htab. */
498 object_block_entry_eq (const void *p1, const void *p2)
500 const struct object_block *old = (const struct object_block *) p1;
501 const section *new_section = (const section *) p2;
503 return old->sect == new_section;
507 object_block_entry_hash (const void *p)
509 const struct object_block *old = (const struct object_block *) p;
510 return hash_section (old->sect);
513 /* Return a new unnamed section with the given fields. */
516 get_unnamed_section (unsigned int flags, void (*callback) (const void *),
521 sect = GGC_NEW (section);
522 sect->unnamed.common.flags = flags | SECTION_UNNAMED;
523 sect->unnamed.callback = callback;
524 sect->unnamed.data = data;
525 sect->unnamed.next = unnamed_sections;
527 unnamed_sections = sect;
531 /* Return a SECTION_NOSWITCH section with the given fields. */
534 get_noswitch_section (unsigned int flags, noswitch_section_callback callback)
538 sect = GGC_NEW (section);
539 sect->noswitch.common.flags = flags | SECTION_NOSWITCH;
540 sect->noswitch.callback = callback;
545 /* Return the named section structure associated with NAME. Create
546 a new section with the given fields if no such structure exists. */
549 get_section (const char *name, unsigned int flags, tree decl)
551 section *sect, **slot;
554 htab_find_slot_with_hash (section_htab, name,
555 htab_hash_string (name), INSERT);
556 flags |= SECTION_NAMED;
559 sect = GGC_NEW (section);
560 sect->named.common.flags = flags;
561 sect->named.name = ggc_strdup (name);
562 sect->named.decl = decl;
568 if ((sect->common.flags & ~SECTION_DECLARED) != flags
569 && ((sect->common.flags | flags) & SECTION_OVERRIDE) == 0)
571 /* Sanity check user variables for flag changes. */
573 decl = sect->named.decl;
575 error ("%+D causes a section type conflict", decl);
581 /* Return true if the current compilation mode benefits from having
582 objects grouped into blocks. */
585 use_object_blocks_p (void)
587 return flag_section_anchors;
590 /* Return the object_block structure for section SECT. Create a new
591 structure if we haven't created one already. Return null if SECT
594 static struct object_block *
595 get_block_for_section (section *sect)
597 struct object_block *block;
603 slot = htab_find_slot_with_hash (object_block_htab, sect,
604 hash_section (sect), INSERT);
605 block = (struct object_block *) *slot;
608 block = (struct object_block *)
609 ggc_alloc_cleared (sizeof (struct object_block));
616 /* Create a symbol with label LABEL and place it at byte offset
617 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
618 is not yet known. LABEL must be a garbage-collected string. */
621 create_block_symbol (const char *label, struct object_block *block,
622 HOST_WIDE_INT offset)
627 /* Create the extended SYMBOL_REF. */
628 size = RTX_HDR_SIZE + sizeof (struct block_symbol);
629 symbol = (rtx) ggc_alloc_zone (size, &rtl_zone);
631 /* Initialize the normal SYMBOL_REF fields. */
632 memset (symbol, 0, size);
633 PUT_CODE (symbol, SYMBOL_REF);
634 PUT_MODE (symbol, Pmode);
635 XSTR (symbol, 0) = label;
636 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_HAS_BLOCK_INFO;
638 /* Initialize the block_symbol stuff. */
639 SYMBOL_REF_BLOCK (symbol) = block;
640 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
646 initialize_cold_section_name (void)
648 const char *stripped_name;
652 gcc_assert (cfun && current_function_decl);
653 if (crtl->subsections.unlikely_text_section_name)
656 dsn = DECL_SECTION_NAME (current_function_decl);
657 if (flag_function_sections && dsn)
659 name = (char *) alloca (TREE_STRING_LENGTH (dsn) + 1);
660 memcpy (name, TREE_STRING_POINTER (dsn), TREE_STRING_LENGTH (dsn) + 1);
662 stripped_name = targetm.strip_name_encoding (name);
664 buffer = ACONCAT ((stripped_name, "_unlikely", NULL));
665 crtl->subsections.unlikely_text_section_name = ggc_strdup (buffer);
668 crtl->subsections.unlikely_text_section_name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
671 /* Tell assembler to switch to unlikely-to-be-executed text section. */
674 unlikely_text_section (void)
678 if (!crtl->subsections.unlikely_text_section_name)
679 initialize_cold_section_name ();
681 return get_named_section (NULL, crtl->subsections.unlikely_text_section_name, 0);
684 return get_named_section (NULL, UNLIKELY_EXECUTED_TEXT_SECTION_NAME, 0);
687 /* When called within a function context, return true if the function
688 has been assigned a cold text section and if SECT is that section.
689 When called outside a function context, return true if SECT is the
690 default cold section. */
693 unlikely_text_section_p (section *sect)
698 name = crtl->subsections.unlikely_text_section_name;
700 name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
704 && SECTION_STYLE (sect) == SECTION_NAMED
705 && strcmp (name, sect->named.name) == 0);
708 /* Return a section with a particular name and with whatever SECTION_*
709 flags section_type_flags deems appropriate. The name of the section
710 is taken from NAME if nonnull, otherwise it is taken from DECL's
711 DECL_SECTION_NAME. DECL is the decl associated with the section
712 (see the section comment for details) and RELOC is as for
713 section_type_flags. */
716 get_named_section (tree decl, const char *name, int reloc)
720 gcc_assert (!decl || DECL_P (decl));
722 name = TREE_STRING_POINTER (DECL_SECTION_NAME (decl));
724 flags = targetm.section_type_flags (decl, name, reloc);
726 return get_section (name, flags, decl);
729 /* If required, set DECL_SECTION_NAME to a unique name. */
732 resolve_unique_section (tree decl, int reloc ATTRIBUTE_UNUSED,
733 int flag_function_or_data_sections)
735 if (DECL_SECTION_NAME (decl) == NULL_TREE
736 && targetm.have_named_sections
737 && (flag_function_or_data_sections
738 || DECL_ONE_ONLY (decl)))
739 targetm.asm_out.unique_section (decl, reloc);
742 #ifdef BSS_SECTION_ASM_OP
744 #ifdef ASM_OUTPUT_BSS
746 /* Utility function for ASM_OUTPUT_BSS for targets to use if
747 they don't support alignments in .bss.
748 ??? It is believed that this function will work in most cases so such
749 support is localized here. */
752 asm_output_bss (FILE *file, tree decl ATTRIBUTE_UNUSED,
754 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
755 unsigned HOST_WIDE_INT rounded)
757 gcc_assert (strcmp (XSTR (XEXP (DECL_RTL (decl), 0), 0), name) == 0);
758 targetm.asm_out.globalize_decl_name (file, decl);
759 switch_to_section (bss_section);
760 #ifdef ASM_DECLARE_OBJECT_NAME
761 last_assemble_variable_decl = decl;
762 ASM_DECLARE_OBJECT_NAME (file, name, decl);
764 /* Standard thing is just output label for the object. */
765 ASM_OUTPUT_LABEL (file, name);
766 #endif /* ASM_DECLARE_OBJECT_NAME */
767 ASM_OUTPUT_SKIP (file, rounded ? rounded : 1);
772 #ifdef ASM_OUTPUT_ALIGNED_BSS
774 /* Utility function for targets to use in implementing
775 ASM_OUTPUT_ALIGNED_BSS.
776 ??? It is believed that this function will work in most cases so such
777 support is localized here. */
780 asm_output_aligned_bss (FILE *file, tree decl ATTRIBUTE_UNUSED,
781 const char *name, unsigned HOST_WIDE_INT size,
784 switch_to_section (bss_section);
785 ASM_OUTPUT_ALIGN (file, floor_log2 (align / BITS_PER_UNIT));
786 #ifdef ASM_DECLARE_OBJECT_NAME
787 last_assemble_variable_decl = decl;
788 ASM_DECLARE_OBJECT_NAME (file, name, decl);
790 /* Standard thing is just output label for the object. */
791 ASM_OUTPUT_LABEL (file, name);
792 #endif /* ASM_DECLARE_OBJECT_NAME */
793 ASM_OUTPUT_SKIP (file, size ? size : 1);
798 #endif /* BSS_SECTION_ASM_OP */
800 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
801 /* Return the hot section for function DECL. Return text_section for
805 hot_function_section (tree decl)
807 if (decl != NULL_TREE
808 && DECL_SECTION_NAME (decl) != NULL_TREE
809 && targetm.have_named_sections)
810 return get_named_section (decl, NULL, 0);
816 /* Return the section for function DECL.
818 If DECL is NULL_TREE, return the text section. We can be passed
819 NULL_TREE under some circumstances by dbxout.c at least. */
822 function_section (tree decl)
826 if (first_function_block_is_cold)
829 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
830 if (decl != NULL_TREE
831 && DECL_SECTION_NAME (decl) != NULL_TREE)
832 return reloc ? unlikely_text_section ()
833 : get_named_section (decl, NULL, 0);
835 return targetm.asm_out.select_section (decl, reloc, DECL_ALIGN (decl));
837 return reloc ? unlikely_text_section () : hot_function_section (decl);
842 current_function_section (void)
844 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
845 if (current_function_decl != NULL_TREE
846 && DECL_SECTION_NAME (current_function_decl) != NULL_TREE)
847 return in_cold_section_p ? unlikely_text_section ()
848 : get_named_section (current_function_decl,
851 return targetm.asm_out.select_section (current_function_decl,
853 DECL_ALIGN (current_function_decl));
855 return (in_cold_section_p
856 ? unlikely_text_section ()
857 : hot_function_section (current_function_decl));
861 /* Return the read-only data section associated with function DECL. */
864 default_function_rodata_section (tree decl)
866 if (decl != NULL_TREE && DECL_SECTION_NAME (decl))
868 const char *name = TREE_STRING_POINTER (DECL_SECTION_NAME (decl));
870 if (DECL_ONE_ONLY (decl) && HAVE_COMDAT_GROUP)
872 size_t len = strlen (name) + 3;
873 char* rname = (char *) alloca (len);
875 strcpy (rname, ".rodata");
876 strcat (rname, name + 5);
877 return get_section (rname, SECTION_LINKONCE, decl);
879 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
880 else if (DECL_ONE_ONLY (decl)
881 && strncmp (name, ".gnu.linkonce.t.", 16) == 0)
883 size_t len = strlen (name) + 1;
884 char *rname = (char *) alloca (len);
886 memcpy (rname, name, len);
888 return get_section (rname, SECTION_LINKONCE, decl);
890 /* For .text.foo we want to use .rodata.foo. */
891 else if (flag_function_sections && flag_data_sections
892 && strncmp (name, ".text.", 6) == 0)
894 size_t len = strlen (name) + 1;
895 char *rname = (char *) alloca (len + 2);
897 memcpy (rname, ".rodata", 7);
898 memcpy (rname + 7, name + 5, len - 5);
899 return get_section (rname, 0, decl);
903 return readonly_data_section;
906 /* Return the read-only data section associated with function DECL
907 for targets where that section should be always the single
908 readonly data section. */
911 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED)
913 return readonly_data_section;
916 /* Return the section to use for string merging. */
919 mergeable_string_section (tree decl ATTRIBUTE_UNUSED,
920 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
921 unsigned int flags ATTRIBUTE_UNUSED)
925 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
926 && TREE_CODE (decl) == STRING_CST
927 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
929 && (len = int_size_in_bytes (TREE_TYPE (decl))) > 0
930 && TREE_STRING_LENGTH (decl) >= len)
932 enum machine_mode mode;
933 unsigned int modesize;
939 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (decl)));
940 modesize = GET_MODE_BITSIZE (mode);
941 if (modesize >= 8 && modesize <= 256
942 && (modesize & (modesize - 1)) == 0)
944 if (align < modesize)
947 str = TREE_STRING_POINTER (decl);
948 unit = GET_MODE_SIZE (mode);
950 /* Check for embedded NUL characters. */
951 for (i = 0; i < len; i += unit)
953 for (j = 0; j < unit; j++)
954 if (str[i + j] != '\0')
961 sprintf (name, ".rodata.str%d.%d", modesize / 8,
963 flags |= (modesize / 8) | SECTION_MERGE | SECTION_STRINGS;
964 return get_section (name, flags, NULL);
969 return readonly_data_section;
972 /* Return the section to use for constant merging. */
975 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED,
976 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
977 unsigned int flags ATTRIBUTE_UNUSED)
979 unsigned int modesize = GET_MODE_BITSIZE (mode);
981 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
987 && (align & (align - 1)) == 0)
991 sprintf (name, ".rodata.cst%d", (int) (align / 8));
992 flags |= (align / 8) | SECTION_MERGE;
993 return get_section (name, flags, NULL);
995 return readonly_data_section;
998 /* Given NAME, a putative register name, discard any customary prefixes. */
1001 strip_reg_name (const char *name)
1003 #ifdef REGISTER_PREFIX
1004 if (!strncmp (name, REGISTER_PREFIX, strlen (REGISTER_PREFIX)))
1005 name += strlen (REGISTER_PREFIX);
1007 if (name[0] == '%' || name[0] == '#')
1012 /* The user has asked for a DECL to have a particular name. Set (or
1013 change) it in such a way that we don't prefix an underscore to
1016 set_user_assembler_name (tree decl, const char *name)
1018 char *starred = (char *) alloca (strlen (name) + 2);
1020 strcpy (starred + 1, name);
1021 change_decl_assembler_name (decl, get_identifier (starred));
1022 SET_DECL_RTL (decl, NULL_RTX);
1025 /* Decode an `asm' spec for a declaration as a register name.
1026 Return the register number, or -1 if nothing specified,
1027 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
1028 or -3 if ASMSPEC is `cc' and is not recognized,
1029 or -4 if ASMSPEC is `memory' and is not recognized.
1030 Accept an exact spelling or a decimal number.
1031 Prefixes such as % are optional. */
1034 decode_reg_name (const char *asmspec)
1040 /* Get rid of confusing prefixes. */
1041 asmspec = strip_reg_name (asmspec);
1043 /* Allow a decimal number as a "register name". */
1044 for (i = strlen (asmspec) - 1; i >= 0; i--)
1045 if (! ISDIGIT (asmspec[i]))
1047 if (asmspec[0] != 0 && i < 0)
1050 if (i < FIRST_PSEUDO_REGISTER && i >= 0)
1056 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
1058 && ! strcmp (asmspec, strip_reg_name (reg_names[i])))
1061 #ifdef ADDITIONAL_REGISTER_NAMES
1063 static const struct { const char *const name; const int number; } table[]
1064 = ADDITIONAL_REGISTER_NAMES;
1066 for (i = 0; i < (int) ARRAY_SIZE (table); i++)
1067 if (table[i].name[0]
1068 && ! strcmp (asmspec, table[i].name))
1069 return table[i].number;
1071 #endif /* ADDITIONAL_REGISTER_NAMES */
1073 if (!strcmp (asmspec, "memory"))
1076 if (!strcmp (asmspec, "cc"))
1085 /* Return true if DECL's initializer is suitable for a BSS section. */
1088 bss_initializer_p (const_tree decl)
1090 return (DECL_INITIAL (decl) == NULL
1091 || DECL_INITIAL (decl) == error_mark_node
1092 || (flag_zero_initialized_in_bss
1093 /* Leave constant zeroes in .rodata so they
1095 && !TREE_READONLY (decl)
1096 && initializer_zerop (DECL_INITIAL (decl))));
1099 /* Compute the alignment of variable specified by DECL.
1100 DONT_OUTPUT_DATA is from assemble_variable. */
1103 align_variable (tree decl, bool dont_output_data)
1105 unsigned int align = DECL_ALIGN (decl);
1107 /* In the case for initialing an array whose length isn't specified,
1108 where we have not yet been able to do the layout,
1109 figure out the proper alignment now. */
1110 if (dont_output_data && DECL_SIZE (decl) == 0
1111 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
1112 align = MAX (align, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl))));
1114 /* Some object file formats have a maximum alignment which they support.
1115 In particular, a.out format supports a maximum alignment of 4. */
1116 if (align > MAX_OFILE_ALIGNMENT)
1118 warning (0, "alignment of %q+D is greater than maximum object "
1119 "file alignment. Using %d", decl,
1120 MAX_OFILE_ALIGNMENT/BITS_PER_UNIT);
1121 align = MAX_OFILE_ALIGNMENT;
1124 /* On some machines, it is good to increase alignment sometimes. */
1125 if (! DECL_USER_ALIGN (decl))
1127 #ifdef DATA_ALIGNMENT
1128 unsigned int data_align = DATA_ALIGNMENT (TREE_TYPE (decl), align);
1129 /* Don't increase alignment too much for TLS variables - TLS space
1131 if (! DECL_THREAD_LOCAL_P (decl) || data_align <= BITS_PER_WORD)
1134 #ifdef CONSTANT_ALIGNMENT
1135 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
1137 unsigned int const_align = CONSTANT_ALIGNMENT (DECL_INITIAL (decl),
1139 /* Don't increase alignment too much for TLS variables - TLS space
1141 if (! DECL_THREAD_LOCAL_P (decl) || const_align <= BITS_PER_WORD)
1142 align = const_align;
1147 /* Reset the alignment in case we have made it tighter, so we can benefit
1148 from it in get_pointer_alignment. */
1149 DECL_ALIGN (decl) = align;
1152 /* Return the section into which the given VAR_DECL or CONST_DECL
1153 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1154 section should be used wherever possible. */
1157 get_variable_section (tree decl, bool prefer_noswitch_p)
1161 /* If the decl has been given an explicit section name, then it
1162 isn't common, and shouldn't be handled as such. */
1163 if (DECL_COMMON (decl) && DECL_SECTION_NAME (decl) == NULL)
1165 if (DECL_THREAD_LOCAL_P (decl))
1166 return tls_comm_section;
1167 /* This cannot be common bss for an emulated TLS object without
1168 a register_common hook. */
1169 else if (DECL_TLS_MODEL (decl) == TLS_MODEL_EMULATED
1170 && !targetm.emutls.register_common)
1172 else if (TREE_PUBLIC (decl) && bss_initializer_p (decl))
1173 return comm_section;
1176 if (DECL_INITIAL (decl) == error_mark_node)
1177 reloc = contains_pointers_p (TREE_TYPE (decl)) ? 3 : 0;
1178 else if (DECL_INITIAL (decl))
1179 reloc = compute_reloc_for_constant (DECL_INITIAL (decl));
1183 resolve_unique_section (decl, reloc, flag_data_sections);
1184 if (IN_NAMED_SECTION (decl))
1185 return get_named_section (decl, NULL, reloc);
1187 if (!DECL_THREAD_LOCAL_P (decl)
1188 && !(prefer_noswitch_p && targetm.have_switchable_bss_sections)
1189 && bss_initializer_p (decl))
1191 if (!TREE_PUBLIC (decl))
1192 return lcomm_section;
1193 if (bss_noswitch_section)
1194 return bss_noswitch_section;
1197 return targetm.asm_out.select_section (decl, reloc, DECL_ALIGN (decl));
1200 /* Return the block into which object_block DECL should be placed. */
1202 static struct object_block *
1203 get_block_for_decl (tree decl)
1207 if (TREE_CODE (decl) == VAR_DECL)
1209 /* The object must be defined in this translation unit. */
1210 if (DECL_EXTERNAL (decl))
1213 /* There's no point using object blocks for something that is
1214 isolated by definition. */
1215 if (DECL_ONE_ONLY (decl))
1219 /* We can only calculate block offsets if the decl has a known
1221 if (DECL_SIZE_UNIT (decl) == NULL)
1223 if (!host_integerp (DECL_SIZE_UNIT (decl), 1))
1226 /* Find out which section should contain DECL. We cannot put it into
1227 an object block if it requires a standalone definition. */
1228 if (TREE_CODE (decl) == VAR_DECL)
1229 align_variable (decl, 0);
1230 sect = get_variable_section (decl, true);
1231 if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
1234 return get_block_for_section (sect);
1237 /* Make sure block symbol SYMBOL is in block BLOCK. */
1240 change_symbol_block (rtx symbol, struct object_block *block)
1242 if (block != SYMBOL_REF_BLOCK (symbol))
1244 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol) < 0);
1245 SYMBOL_REF_BLOCK (symbol) = block;
1249 /* Return true if it is possible to put DECL in an object_block. */
1252 use_blocks_for_decl_p (tree decl)
1254 /* Only data DECLs can be placed into object blocks. */
1255 if (TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != CONST_DECL)
1258 /* Detect decls created by dw2_force_const_mem. Such decls are
1259 special because DECL_INITIAL doesn't specify the decl's true value.
1260 dw2_output_indirect_constants will instead call assemble_variable
1261 with dont_output_data set to 1 and then print the contents itself. */
1262 if (DECL_INITIAL (decl) == decl)
1265 /* If this decl is an alias, then we don't want to emit a definition. */
1266 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl)))
1272 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1273 have static storage duration. In other words, it should not be an
1274 automatic variable, including PARM_DECLs.
1276 There is, however, one exception: this function handles variables
1277 explicitly placed in a particular register by the user.
1279 This is never called for PARM_DECL nodes. */
1282 make_decl_rtl (tree decl)
1284 const char *name = 0;
1288 /* Check that we are not being given an automatic variable. */
1289 gcc_assert (TREE_CODE (decl) != PARM_DECL
1290 && TREE_CODE (decl) != RESULT_DECL);
1292 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1293 gcc_assert (TREE_CODE (decl) != VAR_DECL
1294 || TREE_STATIC (decl)
1295 || TREE_PUBLIC (decl)
1296 || DECL_EXTERNAL (decl)
1297 || DECL_REGISTER (decl));
1299 /* And that we were not given a type or a label. */
1300 gcc_assert (TREE_CODE (decl) != TYPE_DECL
1301 && TREE_CODE (decl) != LABEL_DECL);
1303 /* For a duplicate declaration, we can be called twice on the
1304 same DECL node. Don't discard the RTL already made. */
1305 if (DECL_RTL_SET_P (decl))
1307 /* If the old RTL had the wrong mode, fix the mode. */
1308 x = DECL_RTL (decl);
1309 if (GET_MODE (x) != DECL_MODE (decl))
1310 SET_DECL_RTL (decl, adjust_address_nv (x, DECL_MODE (decl), 0));
1312 if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1315 /* ??? Another way to do this would be to maintain a hashed
1316 table of such critters. Instead of adding stuff to a DECL
1317 to give certain attributes to it, we could use an external
1318 hash map from DECL to set of attributes. */
1320 /* Let the target reassign the RTL if it wants.
1321 This is necessary, for example, when one machine specific
1322 decl attribute overrides another. */
1323 targetm.encode_section_info (decl, DECL_RTL (decl), false);
1325 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1326 on the new decl information. */
1328 && GET_CODE (XEXP (x, 0)) == SYMBOL_REF
1329 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x, 0)))
1330 change_symbol_block (XEXP (x, 0), get_block_for_decl (decl));
1332 /* Make this function static known to the mudflap runtime. */
1333 if (flag_mudflap && TREE_CODE (decl) == VAR_DECL)
1334 mudflap_enqueue_decl (decl);
1339 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
1341 if (name[0] != '*' && TREE_CODE (decl) != FUNCTION_DECL
1342 && DECL_REGISTER (decl))
1344 error ("register name not specified for %q+D", decl);
1346 else if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1348 const char *asmspec = name+1;
1349 reg_number = decode_reg_name (asmspec);
1350 /* First detect errors in declaring global registers. */
1351 if (reg_number == -1)
1352 error ("register name not specified for %q+D", decl);
1353 else if (reg_number < 0)
1354 error ("invalid register name for %q+D", decl);
1355 else if (TYPE_MODE (TREE_TYPE (decl)) == BLKmode)
1356 error ("data type of %q+D isn%'t suitable for a register",
1358 else if (! HARD_REGNO_MODE_OK (reg_number, TYPE_MODE (TREE_TYPE (decl))))
1359 error ("register specified for %q+D isn%'t suitable for data type",
1361 /* Now handle properly declared static register variables. */
1366 if (DECL_INITIAL (decl) != 0 && TREE_STATIC (decl))
1368 DECL_INITIAL (decl) = 0;
1369 error ("global register variable has initial value");
1371 if (TREE_THIS_VOLATILE (decl))
1372 warning (OPT_Wvolatile_register_var,
1373 "optimization may eliminate reads and/or "
1374 "writes to register variables");
1376 /* If the user specified one of the eliminables registers here,
1377 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1378 confused with that register and be eliminated. This usage is
1379 somewhat suspect... */
1381 SET_DECL_RTL (decl, gen_rtx_raw_REG (DECL_MODE (decl), reg_number));
1382 ORIGINAL_REGNO (DECL_RTL (decl)) = reg_number;
1383 REG_USERVAR_P (DECL_RTL (decl)) = 1;
1385 if (TREE_STATIC (decl))
1387 /* Make this register global, so not usable for anything
1389 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1390 name = IDENTIFIER_POINTER (DECL_NAME (decl));
1391 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file, decl, reg_number, name);
1393 nregs = hard_regno_nregs[reg_number][DECL_MODE (decl)];
1395 globalize_reg (reg_number + --nregs);
1398 /* As a register variable, it has no section. */
1402 /* Now handle ordinary static variables and functions (in memory).
1403 Also handle vars declared register invalidly. */
1404 else if (name[0] == '*')
1406 #ifdef REGISTER_PREFIX
1407 if (strlen (REGISTER_PREFIX) != 0)
1409 reg_number = decode_reg_name (name);
1410 if (reg_number >= 0 || reg_number == -3)
1411 error ("register name given for non-register variable %q+D", decl);
1416 /* Specifying a section attribute on a variable forces it into a
1417 non-.bss section, and thus it cannot be common. */
1418 if (TREE_CODE (decl) == VAR_DECL
1419 && DECL_SECTION_NAME (decl) != NULL_TREE
1420 && DECL_INITIAL (decl) == NULL_TREE
1421 && DECL_COMMON (decl))
1422 DECL_COMMON (decl) = 0;
1424 /* Variables can't be both common and weak. */
1425 if (TREE_CODE (decl) == VAR_DECL && DECL_WEAK (decl))
1426 DECL_COMMON (decl) = 0;
1428 if (use_object_blocks_p () && use_blocks_for_decl_p (decl))
1429 x = create_block_symbol (name, get_block_for_decl (decl), -1);
1431 x = gen_rtx_SYMBOL_REF (Pmode, name);
1432 SYMBOL_REF_WEAK (x) = DECL_WEAK (decl);
1433 SET_SYMBOL_REF_DECL (x, decl);
1435 x = gen_rtx_MEM (DECL_MODE (decl), x);
1436 if (TREE_CODE (decl) != FUNCTION_DECL)
1437 set_mem_attributes (x, decl, 1);
1438 SET_DECL_RTL (decl, x);
1440 /* Optionally set flags or add text to the name to record information
1441 such as that it is a function name.
1442 If the name is changed, the macro ASM_OUTPUT_LABELREF
1443 will have to know how to strip this information. */
1444 targetm.encode_section_info (decl, DECL_RTL (decl), true);
1446 /* Make this function static known to the mudflap runtime. */
1447 if (flag_mudflap && TREE_CODE (decl) == VAR_DECL)
1448 mudflap_enqueue_decl (decl);
1451 /* Output a string of literal assembler code
1452 for an `asm' keyword used between functions. */
1455 assemble_asm (tree string)
1459 if (TREE_CODE (string) == ADDR_EXPR)
1460 string = TREE_OPERAND (string, 0);
1462 fprintf (asm_out_file, "\t%s\n", TREE_STRING_POINTER (string));
1465 /* Record an element in the table of global destructors. SYMBOL is
1466 a SYMBOL_REF of the function to be called; PRIORITY is a number
1467 between 0 and MAX_INIT_PRIORITY. */
1470 default_stabs_asm_out_destructor (rtx symbol ATTRIBUTE_UNUSED,
1471 int priority ATTRIBUTE_UNUSED)
1473 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1474 /* Tell GNU LD that this is part of the static destructor set.
1475 This will work for any system that uses stabs, most usefully
1477 dbxout_begin_simple_stabs ("___DTOR_LIST__", 22 /* N_SETT */);
1478 dbxout_stab_value_label (XSTR (symbol, 0));
1480 sorry ("global destructors not supported on this target");
1484 /* Write the address of the entity given by SYMBOL to SEC. */
1486 assemble_addr_to_section (rtx symbol, section *sec)
1488 switch_to_section (sec);
1489 assemble_align (POINTER_SIZE);
1490 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1493 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1494 not) section for PRIORITY. */
1496 get_cdtor_priority_section (int priority, bool constructor_p)
1500 /* ??? This only works reliably with the GNU linker. */
1501 sprintf (buf, "%s.%.5u",
1502 constructor_p ? ".ctors" : ".dtors",
1503 /* Invert the numbering so the linker puts us in the proper
1504 order; constructors are run from right to left, and the
1505 linker sorts in increasing order. */
1506 MAX_INIT_PRIORITY - priority);
1507 return get_section (buf, SECTION_WRITE, NULL);
1511 default_named_section_asm_out_destructor (rtx symbol, int priority)
1515 if (priority != DEFAULT_INIT_PRIORITY)
1516 sec = get_cdtor_priority_section (priority,
1517 /*constructor_p=*/false);
1519 sec = get_section (".dtors", SECTION_WRITE, NULL);
1521 assemble_addr_to_section (symbol, sec);
1524 #ifdef DTORS_SECTION_ASM_OP
1526 default_dtor_section_asm_out_destructor (rtx symbol,
1527 int priority ATTRIBUTE_UNUSED)
1529 assemble_addr_to_section (symbol, dtors_section);
1533 /* Likewise for global constructors. */
1536 default_stabs_asm_out_constructor (rtx symbol ATTRIBUTE_UNUSED,
1537 int priority ATTRIBUTE_UNUSED)
1539 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1540 /* Tell GNU LD that this is part of the static destructor set.
1541 This will work for any system that uses stabs, most usefully
1543 dbxout_begin_simple_stabs ("___CTOR_LIST__", 22 /* N_SETT */);
1544 dbxout_stab_value_label (XSTR (symbol, 0));
1546 sorry ("global constructors not supported on this target");
1551 default_named_section_asm_out_constructor (rtx symbol, int priority)
1555 if (priority != DEFAULT_INIT_PRIORITY)
1556 sec = get_cdtor_priority_section (priority,
1557 /*constructor_p=*/true);
1559 sec = get_section (".ctors", SECTION_WRITE, NULL);
1561 assemble_addr_to_section (symbol, sec);
1564 #ifdef CTORS_SECTION_ASM_OP
1566 default_ctor_section_asm_out_constructor (rtx symbol,
1567 int priority ATTRIBUTE_UNUSED)
1569 assemble_addr_to_section (symbol, ctors_section);
1573 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1574 a nonzero value if the constant pool should be output before the
1575 start of the function, or a zero value if the pool should output
1576 after the end of the function. The default is to put it before the
1579 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1580 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1583 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1584 to be output to assembler.
1585 Set first_global_object_name and weak_global_object_name as appropriate. */
1588 notice_global_symbol (tree decl)
1590 const char **type = &first_global_object_name;
1592 if (first_global_object_name
1593 || !TREE_PUBLIC (decl)
1594 || DECL_EXTERNAL (decl)
1595 || !DECL_NAME (decl)
1596 || (TREE_CODE (decl) != FUNCTION_DECL
1597 && (TREE_CODE (decl) != VAR_DECL
1598 || (DECL_COMMON (decl)
1599 && (DECL_INITIAL (decl) == 0
1600 || DECL_INITIAL (decl) == error_mark_node))))
1601 || !MEM_P (DECL_RTL (decl)))
1604 /* We win when global object is found, but it is useful to know about weak
1605 symbol as well so we can produce nicer unique names. */
1606 if (DECL_WEAK (decl) || DECL_ONE_ONLY (decl) || flag_shlib)
1607 type = &weak_global_object_name;
1613 rtx decl_rtl = DECL_RTL (decl);
1615 p = targetm.strip_name_encoding (XSTR (XEXP (decl_rtl, 0), 0));
1616 name = ggc_strdup (p);
1622 /* Output assembler code for the constant pool of a function and associated
1623 with defining the name of the function. DECL describes the function.
1624 NAME is the function's name. For the constant pool, we use the current
1625 constant pool data. */
1628 assemble_start_function (tree decl, const char *fnname)
1631 char tmp_label[100];
1632 bool hot_label_written = false;
1634 crtl->subsections.unlikely_text_section_name = NULL;
1636 first_function_block_is_cold = false;
1637 if (flag_reorder_blocks_and_partition)
1639 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTB", const_labelno);
1640 crtl->subsections.hot_section_label = ggc_strdup (tmp_label);
1641 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDB", const_labelno);
1642 crtl->subsections.cold_section_label = ggc_strdup (tmp_label);
1643 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTE", const_labelno);
1644 crtl->subsections.hot_section_end_label = ggc_strdup (tmp_label);
1645 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDE", const_labelno);
1646 crtl->subsections.cold_section_end_label = ggc_strdup (tmp_label);
1651 crtl->subsections.hot_section_label = NULL;
1652 crtl->subsections.cold_section_label = NULL;
1653 crtl->subsections.hot_section_end_label = NULL;
1654 crtl->subsections.cold_section_end_label = NULL;
1657 /* The following code does not need preprocessing in the assembler. */
1661 if (CONSTANT_POOL_BEFORE_FUNCTION)
1662 output_constant_pool (fnname, decl);
1664 resolve_unique_section (decl, 0, flag_function_sections);
1666 /* Make sure the not and cold text (code) sections are properly
1667 aligned. This is necessary here in the case where the function
1668 has both hot and cold sections, because we don't want to re-set
1669 the alignment when the section switch happens mid-function. */
1671 if (flag_reorder_blocks_and_partition)
1673 switch_to_section (unlikely_text_section ());
1674 assemble_align (DECL_ALIGN (decl));
1675 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.cold_section_label);
1677 /* When the function starts with a cold section, we need to explicitly
1678 align the hot section and write out the hot section label.
1679 But if the current function is a thunk, we do not have a CFG. */
1681 && BB_PARTITION (ENTRY_BLOCK_PTR->next_bb) == BB_COLD_PARTITION)
1683 switch_to_section (text_section);
1684 assemble_align (DECL_ALIGN (decl));
1685 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_label);
1686 hot_label_written = true;
1687 first_function_block_is_cold = true;
1690 else if (DECL_SECTION_NAME (decl))
1692 /* Calls to function_section rely on first_function_block_is_cold
1693 being accurate. The first block may be cold even if we aren't
1694 doing partitioning, if the entire function was decided by
1695 choose_function_section (predict.c) to be cold. */
1697 initialize_cold_section_name ();
1699 if (crtl->subsections.unlikely_text_section_name
1700 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)),
1701 crtl->subsections.unlikely_text_section_name) == 0)
1702 first_function_block_is_cold = true;
1705 in_cold_section_p = first_function_block_is_cold;
1707 /* Switch to the correct text section for the start of the function. */
1709 switch_to_section (function_section (decl));
1710 if (flag_reorder_blocks_and_partition
1711 && !hot_label_written)
1712 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_label);
1714 /* Tell assembler to move to target machine's alignment for functions. */
1715 align = floor_log2 (DECL_ALIGN (decl) / BITS_PER_UNIT);
1718 ASM_OUTPUT_ALIGN (asm_out_file, align);
1721 /* Handle a user-specified function alignment.
1722 Note that we still need to align to DECL_ALIGN, as above,
1723 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1724 if (! DECL_USER_ALIGN (decl)
1725 && align_functions_log > align
1726 && optimize_function_for_speed_p (cfun))
1728 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1729 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file,
1730 align_functions_log, align_functions - 1);
1732 ASM_OUTPUT_ALIGN (asm_out_file, align_functions_log);
1736 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1737 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file, fnname);
1740 (*debug_hooks->begin_function) (decl);
1742 /* Make function name accessible from other files, if appropriate. */
1744 if (TREE_PUBLIC (decl))
1746 notice_global_symbol (decl);
1748 globalize_decl (decl);
1750 maybe_assemble_visibility (decl);
1753 if (DECL_PRESERVE_P (decl))
1754 targetm.asm_out.mark_decl_preserved (fnname);
1756 /* Do any machine/system dependent processing of the function name. */
1757 #ifdef ASM_DECLARE_FUNCTION_NAME
1758 ASM_DECLARE_FUNCTION_NAME (asm_out_file, fnname, current_function_decl);
1760 /* Standard thing is just output label for the function. */
1761 ASM_OUTPUT_LABEL (asm_out_file, fnname);
1762 #endif /* ASM_DECLARE_FUNCTION_NAME */
1765 /* Output assembler code associated with defining the size of the
1766 function. DECL describes the function. NAME is the function's name. */
1769 assemble_end_function (tree decl, const char *fnname ATTRIBUTE_UNUSED)
1771 #ifdef ASM_DECLARE_FUNCTION_SIZE
1772 /* We could have switched section in the middle of the function. */
1773 if (flag_reorder_blocks_and_partition)
1774 switch_to_section (function_section (decl));
1775 ASM_DECLARE_FUNCTION_SIZE (asm_out_file, fnname, decl);
1777 if (! CONSTANT_POOL_BEFORE_FUNCTION)
1779 output_constant_pool (fnname, decl);
1780 switch_to_section (function_section (decl)); /* need to switch back */
1782 /* Output labels for end of hot/cold text sections (to be used by
1784 if (flag_reorder_blocks_and_partition)
1786 section *save_text_section;
1788 save_text_section = in_section;
1789 switch_to_section (unlikely_text_section ());
1790 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.cold_section_end_label);
1791 if (first_function_block_is_cold)
1792 switch_to_section (text_section);
1794 switch_to_section (function_section (decl));
1795 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_end_label);
1796 switch_to_section (save_text_section);
1800 /* Assemble code to leave SIZE bytes of zeros. */
1803 assemble_zeros (unsigned HOST_WIDE_INT size)
1805 /* Do no output if -fsyntax-only. */
1806 if (flag_syntax_only)
1809 #ifdef ASM_NO_SKIP_IN_TEXT
1810 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1811 so we must output 0s explicitly in the text section. */
1812 if (ASM_NO_SKIP_IN_TEXT && (in_section->common.flags & SECTION_CODE) != 0)
1814 unsigned HOST_WIDE_INT i;
1815 for (i = 0; i < size; i++)
1816 assemble_integer (const0_rtx, 1, BITS_PER_UNIT, 1);
1821 ASM_OUTPUT_SKIP (asm_out_file, size);
1824 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1827 assemble_align (int align)
1829 if (align > BITS_PER_UNIT)
1831 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
1835 /* Assemble a string constant with the specified C string as contents. */
1838 assemble_string (const char *p, int size)
1843 /* If the string is very long, split it up. */
1847 int thissize = size - pos;
1848 if (thissize > maximum)
1851 ASM_OUTPUT_ASCII (asm_out_file, p, thissize);
1859 /* A noswitch_section_callback for lcomm_section. */
1862 emit_local (tree decl ATTRIBUTE_UNUSED,
1863 const char *name ATTRIBUTE_UNUSED,
1864 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1865 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1867 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1868 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, decl, name,
1869 size, DECL_ALIGN (decl));
1871 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1872 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, DECL_ALIGN (decl));
1875 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
1880 /* A noswitch_section_callback for bss_noswitch_section. */
1882 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
1884 emit_bss (tree decl ATTRIBUTE_UNUSED,
1885 const char *name ATTRIBUTE_UNUSED,
1886 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1887 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1889 #if defined ASM_OUTPUT_ALIGNED_BSS
1890 ASM_OUTPUT_ALIGNED_BSS (asm_out_file, decl, name, size, DECL_ALIGN (decl));
1893 ASM_OUTPUT_BSS (asm_out_file, decl, name, size, rounded);
1899 /* A noswitch_section_callback for comm_section. */
1902 emit_common (tree decl ATTRIBUTE_UNUSED,
1903 const char *name ATTRIBUTE_UNUSED,
1904 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1905 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1907 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1908 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, decl, name,
1909 size, DECL_ALIGN (decl));
1911 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1912 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, name, size, DECL_ALIGN (decl));
1915 ASM_OUTPUT_COMMON (asm_out_file, name, size, rounded);
1920 /* A noswitch_section_callback for tls_comm_section. */
1923 emit_tls_common (tree decl ATTRIBUTE_UNUSED,
1924 const char *name ATTRIBUTE_UNUSED,
1925 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1926 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1928 #ifdef ASM_OUTPUT_TLS_COMMON
1929 ASM_OUTPUT_TLS_COMMON (asm_out_file, decl, name, size);
1932 sorry ("thread-local COMMON data not implemented");
1937 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1938 NAME is the name of DECL's SYMBOL_REF. */
1941 assemble_noswitch_variable (tree decl, const char *name, section *sect)
1943 unsigned HOST_WIDE_INT size, rounded;
1945 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
1948 /* Don't allocate zero bytes of common,
1949 since that means "undefined external" in the linker. */
1953 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1954 so that each uninitialized object starts on such a boundary. */
1955 rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1;
1956 rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
1957 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
1959 if (!sect->noswitch.callback (decl, name, size, rounded)
1960 && (unsigned HOST_WIDE_INT) DECL_ALIGN_UNIT (decl) > rounded)
1961 warning (0, "requested alignment for %q+D is greater than "
1962 "implemented alignment of %wu", decl, rounded);
1965 /* A subroutine of assemble_variable. Output the label and contents of
1966 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1967 is as for assemble_variable. */
1970 assemble_variable_contents (tree decl, const char *name,
1971 bool dont_output_data)
1973 /* Do any machine/system dependent processing of the object. */
1974 #ifdef ASM_DECLARE_OBJECT_NAME
1975 last_assemble_variable_decl = decl;
1976 ASM_DECLARE_OBJECT_NAME (asm_out_file, name, decl);
1978 /* Standard thing is just output label for the object. */
1979 ASM_OUTPUT_LABEL (asm_out_file, name);
1980 #endif /* ASM_DECLARE_OBJECT_NAME */
1982 if (!dont_output_data)
1984 if (DECL_INITIAL (decl)
1985 && DECL_INITIAL (decl) != error_mark_node
1986 && !initializer_zerop (DECL_INITIAL (decl)))
1987 /* Output the actual data. */
1988 output_constant (DECL_INITIAL (decl),
1989 tree_low_cst (DECL_SIZE_UNIT (decl), 1),
1992 /* Leave space for it. */
1993 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl), 1));
1997 /* Initialize emulated tls object TO, which refers to TLS variable
1998 DECL and is initialized by PROXY. */
2001 default_emutls_var_init (tree to, tree decl, tree proxy)
2003 VEC(constructor_elt,gc) *v = VEC_alloc (constructor_elt, gc, 4);
2004 constructor_elt *elt;
2005 tree type = TREE_TYPE (to);
2006 tree field = TYPE_FIELDS (type);
2008 elt = VEC_quick_push (constructor_elt, v, NULL);
2010 elt->value = fold_convert (TREE_TYPE (field), DECL_SIZE_UNIT (decl));
2012 elt = VEC_quick_push (constructor_elt, v, NULL);
2013 field = TREE_CHAIN (field);
2015 elt->value = build_int_cst (TREE_TYPE (field),
2016 DECL_ALIGN_UNIT (decl));
2018 elt = VEC_quick_push (constructor_elt, v, NULL);
2019 field = TREE_CHAIN (field);
2021 elt->value = null_pointer_node;
2023 elt = VEC_quick_push (constructor_elt, v, NULL);
2024 field = TREE_CHAIN (field);
2028 return build_constructor (type, v);
2031 /* Assemble everything that is needed for a variable or function declaration.
2032 Not used for automatic variables, and not used for function definitions.
2033 Should not be called for variables of incomplete structure type.
2035 TOP_LEVEL is nonzero if this variable has file scope.
2036 AT_END is nonzero if this is the special handling, at end of compilation,
2037 to define things that have had only tentative definitions.
2038 DONT_OUTPUT_DATA if nonzero means don't actually output the
2039 initial value (that will be done by the caller). */
2042 assemble_variable (tree decl, int top_level ATTRIBUTE_UNUSED,
2043 int at_end ATTRIBUTE_UNUSED, int dont_output_data)
2046 rtx decl_rtl, symbol;
2049 if (! targetm.have_tls
2050 && TREE_CODE (decl) == VAR_DECL
2051 && DECL_THREAD_LOCAL_P (decl))
2053 tree to = emutls_decl (decl);
2055 /* If this variable is defined locally, then we need to initialize the
2056 control structure with size and alignment information. We do this
2057 at the last moment because tentative definitions can take a locally
2058 defined but uninitialized variable and initialize it later, which
2059 would result in incorrect contents. */
2060 if (! DECL_EXTERNAL (to)
2061 && (! DECL_COMMON (to)
2062 || (DECL_INITIAL (decl)
2063 && DECL_INITIAL (decl) != error_mark_node)))
2065 DECL_INITIAL (to) = targetm.emutls.var_init
2066 (to, decl, get_emutls_init_templ_addr (decl));
2068 /* Make sure the template is marked as needed early enough.
2069 Without this, if the variable is placed in a
2070 section-anchored block, the template will only be marked
2071 when it's too late. */
2072 record_references_in_initializer (to);
2078 last_assemble_variable_decl = 0;
2080 /* Normally no need to say anything here for external references,
2081 since assemble_external is called by the language-specific code
2082 when a declaration is first seen. */
2084 if (DECL_EXTERNAL (decl))
2087 /* Output no assembler code for a function declaration.
2088 Only definitions of functions output anything. */
2090 if (TREE_CODE (decl) == FUNCTION_DECL)
2093 /* Do nothing for global register variables. */
2094 if (DECL_RTL_SET_P (decl) && REG_P (DECL_RTL (decl)))
2096 TREE_ASM_WRITTEN (decl) = 1;
2100 /* If type was incomplete when the variable was declared,
2101 see if it is complete now. */
2103 if (DECL_SIZE (decl) == 0)
2104 layout_decl (decl, 0);
2106 /* Still incomplete => don't allocate it; treat the tentative defn
2107 (which is what it must have been) as an `extern' reference. */
2109 if (!dont_output_data && DECL_SIZE (decl) == 0)
2111 error ("storage size of %q+D isn%'t known", decl);
2112 TREE_ASM_WRITTEN (decl) = 1;
2116 /* The first declaration of a variable that comes through this function
2117 decides whether it is global (in C, has external linkage)
2118 or local (in C, has internal linkage). So do nothing more
2119 if this function has already run. */
2121 if (TREE_ASM_WRITTEN (decl))
2124 /* Make sure targetm.encode_section_info is invoked before we set
2126 decl_rtl = DECL_RTL (decl);
2128 TREE_ASM_WRITTEN (decl) = 1;
2130 /* Do no output if -fsyntax-only. */
2131 if (flag_syntax_only)
2136 if (! dont_output_data
2137 && ! host_integerp (DECL_SIZE_UNIT (decl), 1))
2139 error ("size of variable %q+D is too large", decl);
2143 gcc_assert (MEM_P (decl_rtl));
2144 gcc_assert (GET_CODE (XEXP (decl_rtl, 0)) == SYMBOL_REF);
2145 symbol = XEXP (decl_rtl, 0);
2146 name = XSTR (symbol, 0);
2147 if (TREE_PUBLIC (decl) && DECL_NAME (decl))
2148 notice_global_symbol (decl);
2150 /* Compute the alignment of this data. */
2152 align_variable (decl, dont_output_data);
2153 set_mem_align (decl_rtl, DECL_ALIGN (decl));
2155 if (TREE_PUBLIC (decl))
2156 maybe_assemble_visibility (decl);
2158 if (DECL_PRESERVE_P (decl))
2159 targetm.asm_out.mark_decl_preserved (name);
2161 /* First make the assembler name(s) global if appropriate. */
2162 sect = get_variable_section (decl, false);
2163 if (TREE_PUBLIC (decl)
2164 && (sect->common.flags & SECTION_COMMON) == 0)
2165 globalize_decl (decl);
2167 /* Output any data that we will need to use the address of. */
2168 if (DECL_INITIAL (decl) && DECL_INITIAL (decl) != error_mark_node)
2169 output_addressed_constants (DECL_INITIAL (decl));
2171 /* dbxout.c needs to know this. */
2172 if (sect && (sect->common.flags & SECTION_CODE) != 0)
2173 DECL_IN_TEXT_SECTION (decl) = 1;
2175 /* If the decl is part of an object_block, make sure that the decl
2176 has been positioned within its block, but do not write out its
2177 definition yet. output_object_blocks will do that later. */
2178 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
2180 gcc_assert (!dont_output_data);
2181 place_block_symbol (symbol);
2183 else if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
2184 assemble_noswitch_variable (decl, name, sect);
2187 switch_to_section (sect);
2188 if (DECL_ALIGN (decl) > BITS_PER_UNIT)
2189 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (DECL_ALIGN_UNIT (decl)));
2190 assemble_variable_contents (decl, name, dont_output_data);
2194 /* Return 1 if type TYPE contains any pointers. */
2197 contains_pointers_p (tree type)
2199 switch (TREE_CODE (type))
2202 case REFERENCE_TYPE:
2203 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2204 so I'll play safe and return 1. */
2210 case QUAL_UNION_TYPE:
2213 /* For a type that has fields, see if the fields have pointers. */
2214 for (fields = TYPE_FIELDS (type); fields; fields = TREE_CHAIN (fields))
2215 if (TREE_CODE (fields) == FIELD_DECL
2216 && contains_pointers_p (TREE_TYPE (fields)))
2222 /* An array type contains pointers if its element type does. */
2223 return contains_pointers_p (TREE_TYPE (type));
2230 /* We delay assemble_external processing until
2231 the compilation unit is finalized. This is the best we can do for
2232 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2233 it all the way to final. See PR 17982 for further discussion. */
2234 static GTY(()) tree pending_assemble_externals;
2236 #ifdef ASM_OUTPUT_EXTERNAL
2237 /* True if DECL is a function decl for which no out-of-line copy exists.
2238 It is assumed that DECL's assembler name has been set. */
2241 incorporeal_function_p (tree decl)
2243 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
2247 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL
2248 && DECL_FUNCTION_CODE (decl) == BUILT_IN_ALLOCA)
2251 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
2252 if (strncmp (name, "__builtin_", strlen ("__builtin_")) == 0)
2258 /* Actually do the tests to determine if this is necessary, and invoke
2259 ASM_OUTPUT_EXTERNAL. */
2261 assemble_external_real (tree decl)
2263 rtx rtl = DECL_RTL (decl);
2265 if (MEM_P (rtl) && GET_CODE (XEXP (rtl, 0)) == SYMBOL_REF
2266 && !SYMBOL_REF_USED (XEXP (rtl, 0))
2267 && !incorporeal_function_p (decl))
2269 /* Some systems do require some output. */
2270 SYMBOL_REF_USED (XEXP (rtl, 0)) = 1;
2271 ASM_OUTPUT_EXTERNAL (asm_out_file, decl, XSTR (XEXP (rtl, 0), 0));
2277 process_pending_assemble_externals (void)
2279 #ifdef ASM_OUTPUT_EXTERNAL
2281 for (list = pending_assemble_externals; list; list = TREE_CHAIN (list))
2282 assemble_external_real (TREE_VALUE (list));
2284 pending_assemble_externals = 0;
2288 /* This TREE_LIST contains any weak symbol declarations waiting
2290 static GTY(()) tree weak_decls;
2292 /* Output something to declare an external symbol to the assembler,
2293 and qualifiers such as weakness. (Most assemblers don't need
2294 extern declaration, so we normally output nothing.) Do nothing if
2295 DECL is not external. */
2298 assemble_external (tree decl ATTRIBUTE_UNUSED)
2300 /* Because most platforms do not define ASM_OUTPUT_EXTERNAL, the
2301 main body of this code is only rarely exercised. To provide some
2302 testing, on all platforms, we make sure that the ASM_OUT_FILE is
2303 open. If it's not, we should not be calling this function. */
2304 gcc_assert (asm_out_file);
2306 if (!DECL_P (decl) || !DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl))
2309 /* We want to output annotation for weak and external symbols at
2310 very last to check if they are references or not. */
2314 /* TREE_STATIC is a weird and abused creature which is not
2315 generally the right test for whether an entity has been
2316 locally emitted, inlined or otherwise not-really-extern, but
2317 for declarations that can be weak, it happens to be
2319 && !TREE_STATIC (decl)
2320 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl)))
2321 weak_decls = tree_cons (NULL, decl, weak_decls);
2323 #ifdef ASM_OUTPUT_EXTERNAL
2324 pending_assemble_externals = tree_cons (0, decl,
2325 pending_assemble_externals);
2329 /* Similar, for calling a library function FUN. */
2332 assemble_external_libcall (rtx fun)
2334 /* Declare library function name external when first used, if nec. */
2335 if (! SYMBOL_REF_USED (fun))
2337 SYMBOL_REF_USED (fun) = 1;
2338 targetm.asm_out.external_libcall (fun);
2342 /* Assemble a label named NAME. */
2345 assemble_label (const char *name)
2347 ASM_OUTPUT_LABEL (asm_out_file, name);
2350 /* Set the symbol_referenced flag for ID. */
2352 mark_referenced (tree id)
2354 TREE_SYMBOL_REFERENCED (id) = 1;
2357 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2359 mark_decl_referenced (tree decl)
2361 if (TREE_CODE (decl) == FUNCTION_DECL)
2363 /* Extern inline functions don't become needed when referenced.
2364 If we know a method will be emitted in other TU and no new
2365 functions can be marked reachable, just use the external
2367 struct cgraph_node *node = cgraph_node (decl);
2368 if (!DECL_EXTERNAL (decl)
2369 && (!node->local.vtable_method || !cgraph_global_info_ready
2370 || !node->local.finalized))
2371 cgraph_mark_needed_node (node);
2373 else if (TREE_CODE (decl) == VAR_DECL)
2375 struct varpool_node *node = varpool_node (decl);
2376 varpool_mark_needed_node (node);
2377 /* C++ frontend use mark_decl_references to force COMDAT variables
2378 to be output that might appear dead otherwise. */
2379 node->force_output = true;
2381 /* else do nothing - we can get various sorts of CST nodes here,
2382 which do not need to be marked. */
2386 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2387 until we find an identifier that is not itself a transparent alias.
2388 Modify the alias passed to it by reference (and all aliases on the
2389 way to the ultimate target), such that they do not have to be
2390 followed again, and return the ultimate target of the alias
2394 ultimate_transparent_alias_target (tree *alias)
2396 tree target = *alias;
2398 if (IDENTIFIER_TRANSPARENT_ALIAS (target))
2400 gcc_assert (TREE_CHAIN (target));
2401 target = ultimate_transparent_alias_target (&TREE_CHAIN (target));
2402 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target)
2403 && ! TREE_CHAIN (target));
2410 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2411 starts with a *, the rest of NAME is output verbatim. Otherwise
2412 NAME is transformed in a target-specific way (usually by the
2413 addition of an underscore). */
2416 assemble_name_raw (FILE *file, const char *name)
2419 fputs (&name[1], file);
2421 ASM_OUTPUT_LABELREF (file, name);
2424 /* Like assemble_name_raw, but should be used when NAME might refer to
2425 an entity that is also represented as a tree (like a function or
2426 variable). If NAME does refer to such an entity, that entity will
2427 be marked as referenced. */
2430 assemble_name (FILE *file, const char *name)
2432 const char *real_name;
2435 real_name = targetm.strip_name_encoding (name);
2437 id = maybe_get_identifier (real_name);
2442 mark_referenced (id);
2443 ultimate_transparent_alias_target (&id);
2445 name = IDENTIFIER_POINTER (id);
2446 gcc_assert (! TREE_CHAIN (id));
2449 assemble_name_raw (file, name);
2452 /* Allocate SIZE bytes writable static space with a gensym name
2453 and return an RTX to refer to its address. */
2456 assemble_static_space (unsigned HOST_WIDE_INT size)
2459 const char *namestring;
2462 ASM_GENERATE_INTERNAL_LABEL (name, "LF", const_labelno);
2464 namestring = ggc_strdup (name);
2466 x = gen_rtx_SYMBOL_REF (Pmode, namestring);
2467 SYMBOL_REF_FLAGS (x) = SYMBOL_FLAG_LOCAL;
2469 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2470 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, NULL_TREE, name, size,
2473 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2474 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, BIGGEST_ALIGNMENT);
2477 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2478 so that each uninitialized object starts on such a boundary. */
2479 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2480 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2481 = ((size + (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1)
2482 / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
2483 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
2484 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
2491 /* Assemble the static constant template for function entry trampolines.
2492 This is done at most once per compilation.
2493 Returns an RTX for the address of the template. */
2495 static GTY(()) rtx initial_trampoline;
2497 #ifdef TRAMPOLINE_TEMPLATE
2499 assemble_trampoline_template (void)
2506 if (initial_trampoline)
2507 return initial_trampoline;
2509 /* By default, put trampoline templates in read-only data section. */
2511 #ifdef TRAMPOLINE_SECTION
2512 switch_to_section (TRAMPOLINE_SECTION);
2514 switch_to_section (readonly_data_section);
2517 /* Write the assembler code to define one. */
2518 align = floor_log2 (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT);
2521 ASM_OUTPUT_ALIGN (asm_out_file, align);
2524 targetm.asm_out.internal_label (asm_out_file, "LTRAMP", 0);
2525 TRAMPOLINE_TEMPLATE (asm_out_file);
2527 /* Record the rtl to refer to it. */
2528 ASM_GENERATE_INTERNAL_LABEL (label, "LTRAMP", 0);
2529 name = ggc_strdup (label);
2530 symbol = gen_rtx_SYMBOL_REF (Pmode, name);
2531 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_LOCAL;
2533 initial_trampoline = gen_rtx_MEM (BLKmode, symbol);
2534 set_mem_align (initial_trampoline, TRAMPOLINE_ALIGNMENT);
2536 return initial_trampoline;
2540 /* A and B are either alignments or offsets. Return the minimum alignment
2541 that may be assumed after adding the two together. */
2543 static inline unsigned
2544 min_align (unsigned int a, unsigned int b)
2546 return (a | b) & -(a | b);
2549 /* Return the assembler directive for creating a given kind of integer
2550 object. SIZE is the number of bytes in the object and ALIGNED_P
2551 indicates whether it is known to be aligned. Return NULL if the
2552 assembly dialect has no such directive.
2554 The returned string should be printed at the start of a new line and
2555 be followed immediately by the object's initial value. */
2558 integer_asm_op (int size, int aligned_p)
2560 struct asm_int_op *ops;
2563 ops = &targetm.asm_out.aligned_op;
2565 ops = &targetm.asm_out.unaligned_op;
2570 return targetm.asm_out.byte_op;
2584 /* Use directive OP to assemble an integer object X. Print OP at the
2585 start of the line, followed immediately by the value of X. */
2588 assemble_integer_with_op (const char *op, rtx x)
2590 fputs (op, asm_out_file);
2591 output_addr_const (asm_out_file, x);
2592 fputc ('\n', asm_out_file);
2595 /* The default implementation of the asm_out.integer target hook. */
2598 default_assemble_integer (rtx x ATTRIBUTE_UNUSED,
2599 unsigned int size ATTRIBUTE_UNUSED,
2600 int aligned_p ATTRIBUTE_UNUSED)
2602 const char *op = integer_asm_op (size, aligned_p);
2603 /* Avoid GAS bugs for large values. Specifically negative values whose
2604 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2605 if (size > UNITS_PER_WORD && size > POINTER_SIZE / BITS_PER_UNIT)
2607 return op && (assemble_integer_with_op (op, x), true);
2610 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2611 the alignment of the integer in bits. Return 1 if we were able to output
2612 the constant, otherwise 0. We must be able to output the constant,
2613 if FORCE is nonzero. */
2616 assemble_integer (rtx x, unsigned int size, unsigned int align, int force)
2620 aligned_p = (align >= MIN (size * BITS_PER_UNIT, BIGGEST_ALIGNMENT));
2622 /* See if the target hook can handle this kind of object. */
2623 if (targetm.asm_out.integer (x, size, aligned_p))
2626 /* If the object is a multi-byte one, try splitting it up. Split
2627 it into words it if is multi-word, otherwise split it into bytes. */
2630 enum machine_mode omode, imode;
2631 unsigned int subalign;
2632 unsigned int subsize, i;
2633 unsigned char mclass;
2635 subsize = size > UNITS_PER_WORD? UNITS_PER_WORD : 1;
2636 subalign = MIN (align, subsize * BITS_PER_UNIT);
2637 if (GET_CODE (x) == CONST_FIXED)
2638 mclass = GET_MODE_CLASS (GET_MODE (x));
2642 omode = mode_for_size (subsize * BITS_PER_UNIT, mclass, 0);
2643 imode = mode_for_size (size * BITS_PER_UNIT, mclass, 0);
2645 for (i = 0; i < size; i += subsize)
2647 rtx partial = simplify_subreg (omode, x, imode, i);
2648 if (!partial || !assemble_integer (partial, subsize, subalign, 0))
2654 /* If we've printed some of it, but not all of it, there's no going
2659 gcc_assert (!force);
2665 assemble_real (REAL_VALUE_TYPE d, enum machine_mode mode, unsigned int align)
2667 long data[4] = {0, 0, 0, 0};
2669 int bitsize, nelts, nunits, units_per;
2671 /* This is hairy. We have a quantity of known size. real_to_target
2672 will put it into an array of *host* longs, 32 bits per element
2673 (even if long is more than 32 bits). We need to determine the
2674 number of array elements that are occupied (nelts) and the number
2675 of *target* min-addressable units that will be occupied in the
2676 object file (nunits). We cannot assume that 32 divides the
2677 mode's bitsize (size * BITS_PER_UNIT) evenly.
2679 size * BITS_PER_UNIT is used here to make sure that padding bits
2680 (which might appear at either end of the value; real_to_target
2681 will include the padding bits in its output array) are included. */
2683 nunits = GET_MODE_SIZE (mode);
2684 bitsize = nunits * BITS_PER_UNIT;
2685 nelts = CEIL (bitsize, 32);
2686 units_per = 32 / BITS_PER_UNIT;
2688 real_to_target (data, &d, mode);
2690 /* Put out the first word with the specified alignment. */
2691 assemble_integer (GEN_INT (data[0]), MIN (nunits, units_per), align, 1);
2692 nunits -= units_per;
2694 /* Subsequent words need only 32-bit alignment. */
2695 align = min_align (align, 32);
2697 for (i = 1; i < nelts; i++)
2699 assemble_integer (GEN_INT (data[i]), MIN (nunits, units_per), align, 1);
2700 nunits -= units_per;
2704 /* Given an expression EXP with a constant value,
2705 reduce it to the sum of an assembler symbol and an integer.
2706 Store them both in the structure *VALUE.
2707 EXP must be reducible. */
2709 struct addr_const GTY(())
2712 HOST_WIDE_INT offset;
2716 decode_addr_const (tree exp, struct addr_const *value)
2718 tree target = TREE_OPERAND (exp, 0);
2724 if (TREE_CODE (target) == COMPONENT_REF
2725 && host_integerp (byte_position (TREE_OPERAND (target, 1)), 0))
2728 offset += int_byte_position (TREE_OPERAND (target, 1));
2729 target = TREE_OPERAND (target, 0);
2731 else if (TREE_CODE (target) == ARRAY_REF
2732 || TREE_CODE (target) == ARRAY_RANGE_REF)
2734 offset += (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target)), 1)
2735 * tree_low_cst (TREE_OPERAND (target, 1), 0));
2736 target = TREE_OPERAND (target, 0);
2742 switch (TREE_CODE (target))
2746 x = DECL_RTL (target);
2750 x = gen_rtx_MEM (FUNCTION_MODE,
2751 gen_rtx_LABEL_REF (Pmode, force_label_rtx (target)));
2760 x = output_constant_def (target, 1);
2767 gcc_assert (MEM_P (x));
2771 value->offset = offset;
2774 /* Uniquize all constants that appear in memory.
2775 Each constant in memory thus far output is recorded
2776 in `const_desc_table'. */
2778 struct constant_descriptor_tree GTY(())
2780 /* A MEM for the constant. */
2783 /* The value of the constant. */
2786 /* Hash of value. Computing the hash from value each time
2787 hashfn is called can't work properly, as that means recursive
2788 use of the hash table during hash table expansion. */
2792 static GTY((param_is (struct constant_descriptor_tree)))
2793 htab_t const_desc_htab;
2795 static struct constant_descriptor_tree * build_constant_desc (tree);
2796 static void maybe_output_constant_def_contents (struct constant_descriptor_tree *, int);
2798 /* Compute a hash code for a constant expression. */
2801 const_desc_hash (const void *ptr)
2803 return ((const struct constant_descriptor_tree *)ptr)->hash;
2807 const_hash_1 (const tree exp)
2812 enum tree_code code = TREE_CODE (exp);
2814 /* Either set P and LEN to the address and len of something to hash and
2815 exit the switch or return a value. */
2820 p = (char *) &TREE_INT_CST (exp);
2821 len = sizeof TREE_INT_CST (exp);
2825 return real_hash (TREE_REAL_CST_PTR (exp));
2828 return fixed_hash (TREE_FIXED_CST_PTR (exp));
2831 p = TREE_STRING_POINTER (exp);
2832 len = TREE_STRING_LENGTH (exp);
2836 return (const_hash_1 (TREE_REALPART (exp)) * 5
2837 + const_hash_1 (TREE_IMAGPART (exp)));
2841 unsigned HOST_WIDE_INT idx;
2844 hi = 5 + int_size_in_bytes (TREE_TYPE (exp));
2846 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, value)
2848 hi = hi * 603 + const_hash_1 (value);
2856 struct addr_const value;
2858 decode_addr_const (exp, &value);
2859 switch (GET_CODE (value.base))
2862 /* Don't hash the address of the SYMBOL_REF;
2863 only use the offset and the symbol name. */
2865 p = XSTR (value.base, 0);
2866 for (i = 0; p[i] != 0; i++)
2867 hi = ((hi * 613) + (unsigned) (p[i]));
2871 hi = value.offset + CODE_LABEL_NUMBER (XEXP (value.base, 0)) * 13;
2881 case POINTER_PLUS_EXPR:
2883 return (const_hash_1 (TREE_OPERAND (exp, 0)) * 9
2884 + const_hash_1 (TREE_OPERAND (exp, 1)));
2887 return const_hash_1 (TREE_OPERAND (exp, 0)) * 7 + 2;
2890 /* A language specific constant. Just hash the code. */
2894 /* Compute hashing function. */
2896 for (i = 0; i < len; i++)
2897 hi = ((hi * 613) + (unsigned) (p[i]));
2902 /* Wrapper of compare_constant, for the htab interface. */
2904 const_desc_eq (const void *p1, const void *p2)
2906 const struct constant_descriptor_tree *const c1
2907 = (const struct constant_descriptor_tree *) p1;
2908 const struct constant_descriptor_tree *const c2
2909 = (const struct constant_descriptor_tree *) p2;
2910 if (c1->hash != c2->hash)
2912 return compare_constant (c1->value, c2->value);
2915 /* Compare t1 and t2, and return 1 only if they are known to result in
2916 the same bit pattern on output. */
2919 compare_constant (const tree t1, const tree t2)
2921 enum tree_code typecode;
2923 if (t1 == NULL_TREE)
2924 return t2 == NULL_TREE;
2925 if (t2 == NULL_TREE)
2928 if (TREE_CODE (t1) != TREE_CODE (t2))
2931 switch (TREE_CODE (t1))
2934 /* Integer constants are the same only if the same width of type. */
2935 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2937 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2939 return tree_int_cst_equal (t1, t2);
2942 /* Real constants are the same only if the same width of type. */
2943 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2946 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2));
2949 /* Fixed constants are the same only if the same width of type. */
2950 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2953 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1), TREE_FIXED_CST (t2));
2956 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2959 return (TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
2960 && ! memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
2961 TREE_STRING_LENGTH (t1)));
2964 return (compare_constant (TREE_REALPART (t1), TREE_REALPART (t2))
2965 && compare_constant (TREE_IMAGPART (t1), TREE_IMAGPART (t2)));
2969 VEC(constructor_elt, gc) *v1, *v2;
2970 unsigned HOST_WIDE_INT idx;
2972 typecode = TREE_CODE (TREE_TYPE (t1));
2973 if (typecode != TREE_CODE (TREE_TYPE (t2)))
2976 if (typecode == ARRAY_TYPE)
2978 HOST_WIDE_INT size_1 = int_size_in_bytes (TREE_TYPE (t1));
2979 /* For arrays, check that the sizes all match. */
2980 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2))
2982 || size_1 != int_size_in_bytes (TREE_TYPE (t2)))
2987 /* For record and union constructors, require exact type
2989 if (TREE_TYPE (t1) != TREE_TYPE (t2))
2993 v1 = CONSTRUCTOR_ELTS (t1);
2994 v2 = CONSTRUCTOR_ELTS (t2);
2995 if (VEC_length (constructor_elt, v1)
2996 != VEC_length (constructor_elt, v2))
2999 for (idx = 0; idx < VEC_length (constructor_elt, v1); ++idx)
3001 constructor_elt *c1 = VEC_index (constructor_elt, v1, idx);
3002 constructor_elt *c2 = VEC_index (constructor_elt, v2, idx);
3004 /* Check that each value is the same... */
3005 if (!compare_constant (c1->value, c2->value))
3007 /* ... and that they apply to the same fields! */
3008 if (typecode == ARRAY_TYPE)
3010 if (!compare_constant (c1->index, c2->index))
3015 if (c1->index != c2->index)
3026 struct addr_const value1, value2;
3028 decode_addr_const (t1, &value1);
3029 decode_addr_const (t2, &value2);
3030 return (value1.offset == value2.offset
3031 && strcmp (XSTR (value1.base, 0), XSTR (value2.base, 0)) == 0);
3035 case POINTER_PLUS_EXPR:
3038 return (compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0))
3039 && compare_constant(TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1)));
3042 case VIEW_CONVERT_EXPR:
3043 return compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3052 /* Make a copy of the whole tree structure for a constant. This
3053 handles the same types of nodes that compare_constant handles. */
3056 copy_constant (tree exp)
3058 switch (TREE_CODE (exp))
3061 /* For ADDR_EXPR, we do not want to copy the decl whose address
3062 is requested. We do want to copy constants though. */
3063 if (CONSTANT_CLASS_P (TREE_OPERAND (exp, 0)))
3064 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
3065 copy_constant (TREE_OPERAND (exp, 0)));
3067 return copy_node (exp);
3073 return copy_node (exp);
3076 return build_complex (TREE_TYPE (exp),
3077 copy_constant (TREE_REALPART (exp)),
3078 copy_constant (TREE_IMAGPART (exp)));
3081 case POINTER_PLUS_EXPR:
3083 return build2 (TREE_CODE (exp), TREE_TYPE (exp),
3084 copy_constant (TREE_OPERAND (exp, 0)),
3085 copy_constant (TREE_OPERAND (exp, 1)));
3088 case VIEW_CONVERT_EXPR:
3089 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
3090 copy_constant (TREE_OPERAND (exp, 0)));
3094 tree copy = copy_node (exp);
3095 VEC(constructor_elt, gc) *v;
3096 unsigned HOST_WIDE_INT idx;
3097 tree purpose, value;
3099 v = VEC_alloc(constructor_elt, gc, VEC_length(constructor_elt,
3100 CONSTRUCTOR_ELTS (exp)));
3101 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp), idx, purpose, value)
3103 constructor_elt *ce = VEC_quick_push (constructor_elt, v, NULL);
3104 ce->index = purpose;
3105 ce->value = copy_constant (value);
3107 CONSTRUCTOR_ELTS (copy) = v;
3116 /* Return the alignment of constant EXP in bits. */
3119 get_constant_alignment (tree exp)
3123 align = TYPE_ALIGN (TREE_TYPE (exp));
3124 #ifdef CONSTANT_ALIGNMENT
3125 align = CONSTANT_ALIGNMENT (exp, align);
3130 /* Return the section into which constant EXP should be placed. */
3133 get_constant_section (tree exp)
3135 if (IN_NAMED_SECTION (exp))
3136 return get_named_section (exp, NULL, compute_reloc_for_constant (exp));
3138 return targetm.asm_out.select_section (exp,
3139 compute_reloc_for_constant (exp),
3140 get_constant_alignment (exp));
3143 /* Return the size of constant EXP in bytes. */
3145 static HOST_WIDE_INT
3146 get_constant_size (tree exp)
3150 size = int_size_in_bytes (TREE_TYPE (exp));
3151 if (TREE_CODE (exp) == STRING_CST)
3152 size = MAX (TREE_STRING_LENGTH (exp), size);
3156 /* Subroutine of output_constant_def:
3157 No constant equal to EXP is known to have been output.
3158 Make a constant descriptor to enter EXP in the hash table.
3159 Assign the label number and construct RTL to refer to the
3160 constant's location in memory.
3161 Caller is responsible for updating the hash table. */
3163 static struct constant_descriptor_tree *
3164 build_constant_desc (tree exp)
3170 struct constant_descriptor_tree *desc;
3172 desc = GGC_NEW (struct constant_descriptor_tree);
3173 desc->value = copy_constant (exp);
3175 /* Propagate marked-ness to copied constant. */
3176 if (flag_mudflap && mf_marked_p (exp))
3177 mf_mark (desc->value);
3179 /* Create a string containing the label name, in LABEL. */
3180 labelno = const_labelno++;
3181 ASM_GENERATE_INTERNAL_LABEL (label, "LC", labelno);
3183 /* We have a symbol name; construct the SYMBOL_REF and the MEM. */
3184 if (use_object_blocks_p ())
3186 section *sect = get_constant_section (exp);
3187 symbol = create_block_symbol (ggc_strdup (label),
3188 get_block_for_section (sect), -1);
3191 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3192 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3193 SET_SYMBOL_REF_DECL (symbol, desc->value);
3194 TREE_CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3196 rtl = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), symbol);
3197 set_mem_attributes (rtl, exp, 1);
3198 set_mem_alias_set (rtl, 0);
3199 set_mem_alias_set (rtl, const_alias_set);
3201 /* Set flags or add text to the name to record information, such as
3202 that it is a local symbol. If the name is changed, the macro
3203 ASM_OUTPUT_LABELREF will have to know how to strip this
3204 information. This call might invalidate our local variable
3205 SYMBOL; we can't use it afterward. */
3207 targetm.encode_section_info (exp, rtl, true);
3214 /* Return an rtx representing a reference to constant data in memory
3215 for the constant expression EXP.
3217 If assembler code for such a constant has already been output,
3218 return an rtx to refer to it.
3219 Otherwise, output such a constant in memory
3220 and generate an rtx for it.
3222 If DEFER is nonzero, this constant can be deferred and output only
3223 if referenced in the function after all optimizations.
3225 `const_desc_table' records which constants already have label strings. */
3228 output_constant_def (tree exp, int defer)
3230 struct constant_descriptor_tree *desc;
3231 struct constant_descriptor_tree key;
3234 /* Look up EXP in the table of constant descriptors. If we didn't find
3235 it, create a new one. */
3237 key.hash = const_hash_1 (exp);
3238 loc = htab_find_slot_with_hash (const_desc_htab, &key, key.hash, INSERT);
3240 desc = (struct constant_descriptor_tree *) *loc;
3243 desc = build_constant_desc (exp);
3244 desc->hash = key.hash;
3248 maybe_output_constant_def_contents (desc, defer);
3252 /* Subroutine of output_constant_def: Decide whether or not we need to
3253 output the constant DESC now, and if so, do it. */
3255 maybe_output_constant_def_contents (struct constant_descriptor_tree *desc,
3258 rtx symbol = XEXP (desc->rtl, 0);
3259 tree exp = desc->value;
3261 if (flag_syntax_only)
3264 if (TREE_ASM_WRITTEN (exp))
3265 /* Already output; don't do it again. */
3268 /* We can always defer constants as long as the context allows
3272 /* Increment n_deferred_constants if it exists. It needs to be at
3273 least as large as the number of constants actually referred to
3274 by the function. If it's too small we'll stop looking too early
3275 and fail to emit constants; if it's too large we'll only look
3276 through the entire function when we could have stopped earlier. */
3278 n_deferred_constants++;
3282 output_constant_def_contents (symbol);
3285 /* Subroutine of output_constant_def_contents. Output the definition
3286 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3287 constant's alignment in bits. */
3290 assemble_constant_contents (tree exp, const char *label, unsigned int align)
3294 size = get_constant_size (exp);
3296 /* Do any machine/system dependent processing of the constant. */
3297 #ifdef ASM_DECLARE_CONSTANT_NAME
3298 ASM_DECLARE_CONSTANT_NAME (asm_out_file, label, exp, size);
3300 /* Standard thing is just output label for the constant. */
3301 ASM_OUTPUT_LABEL (asm_out_file, label);
3302 #endif /* ASM_DECLARE_CONSTANT_NAME */
3304 /* Output the value of EXP. */
3305 output_constant (exp, size, align);
3308 /* We must output the constant data referred to by SYMBOL; do so. */
3311 output_constant_def_contents (rtx symbol)
3313 tree exp = SYMBOL_REF_DECL (symbol);
3316 /* Make sure any other constants whose addresses appear in EXP
3317 are assigned label numbers. */
3318 output_addressed_constants (exp);
3320 /* We are no longer deferring this constant. */
3321 TREE_ASM_WRITTEN (exp) = 1;
3323 /* If the constant is part of an object block, make sure that the
3324 decl has been positioned within its block, but do not write out
3325 its definition yet. output_object_blocks will do that later. */
3326 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
3327 place_block_symbol (symbol);
3330 switch_to_section (get_constant_section (exp));
3331 align = get_constant_alignment (exp);
3332 if (align > BITS_PER_UNIT)
3333 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
3334 assemble_constant_contents (exp, XSTR (symbol, 0), align);
3337 mudflap_enqueue_constant (exp);
3340 /* Look up EXP in the table of constant descriptors. Return the rtl
3341 if it has been emitted, else null. */
3344 lookup_constant_def (tree exp)
3346 struct constant_descriptor_tree *desc;
3347 struct constant_descriptor_tree key;
3350 key.hash = const_hash_1 (exp);
3351 desc = (struct constant_descriptor_tree *)
3352 htab_find_with_hash (const_desc_htab, &key, key.hash);
3354 return (desc ? desc->rtl : NULL_RTX);
3357 /* Used in the hash tables to avoid outputting the same constant
3358 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3359 are output once per function, not once per file. */
3360 /* ??? Only a few targets need per-function constant pools. Most
3361 can use one per-file pool. Should add a targetm bit to tell the
3364 struct rtx_constant_pool GTY(())
3366 /* Pointers to first and last constant in pool, as ordered by offset. */
3367 struct constant_descriptor_rtx *first;
3368 struct constant_descriptor_rtx *last;
3370 /* Hash facility for making memory-constants from constant rtl-expressions.
3371 It is used on RISC machines where immediate integer arguments and
3372 constant addresses are restricted so that such constants must be stored
3374 htab_t GTY((param_is (struct constant_descriptor_rtx))) const_rtx_htab;
3376 /* Current offset in constant pool (does not include any
3377 machine-specific header). */
3378 HOST_WIDE_INT offset;
3381 struct constant_descriptor_rtx GTY((chain_next ("%h.next")))
3383 struct constant_descriptor_rtx *next;
3387 HOST_WIDE_INT offset;
3389 enum machine_mode mode;
3395 /* Hash and compare functions for const_rtx_htab. */
3398 const_desc_rtx_hash (const void *ptr)
3400 const struct constant_descriptor_rtx *const desc
3401 = (const struct constant_descriptor_rtx *) ptr;
3406 const_desc_rtx_eq (const void *a, const void *b)
3408 const struct constant_descriptor_rtx *const x
3409 = (const struct constant_descriptor_rtx *) a;
3410 const struct constant_descriptor_rtx *const y
3411 = (const struct constant_descriptor_rtx *) b;
3413 if (x->mode != y->mode)
3415 return rtx_equal_p (x->constant, y->constant);
3418 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3421 const_rtx_hash_1 (rtx *xp, void *data)
3423 unsigned HOST_WIDE_INT hwi;
3424 enum machine_mode mode;
3430 code = GET_CODE (x);
3431 mode = GET_MODE (x);
3432 h = (hashval_t) code * 1048573 + mode;
3440 const int shift = sizeof (hashval_t) * CHAR_BIT;
3441 const int n = sizeof (HOST_WIDE_INT) / sizeof (hashval_t);
3444 h ^= (hashval_t) hwi;
3445 for (i = 1; i < n; ++i)
3448 h ^= (hashval_t) hwi;
3454 if (mode == VOIDmode)
3456 hwi = CONST_DOUBLE_LOW (x) ^ CONST_DOUBLE_HIGH (x);
3460 h ^= real_hash (CONST_DOUBLE_REAL_VALUE (x));
3464 h ^= fixed_hash (CONST_FIXED_VALUE (x));
3470 for (i = XVECLEN (x, 0); i-- > 0; )
3471 h = h * 251 + const_rtx_hash_1 (&XVECEXP (x, 0, i), data);
3476 h ^= htab_hash_string (XSTR (x, 0));
3480 h = h * 251 + CODE_LABEL_NUMBER (XEXP (x, 0));
3484 case UNSPEC_VOLATILE:
3485 h = h * 251 + XINT (x, 1);
3492 hp = (hashval_t *) data;
3493 *hp = *hp * 509 + h;
3497 /* Compute a hash value for X, which should be a constant. */
3500 const_rtx_hash (rtx x)
3503 for_each_rtx (&x, const_rtx_hash_1, &h);
3508 /* Create and return a new rtx constant pool. */
3510 static struct rtx_constant_pool *
3511 create_constant_pool (void)
3513 struct rtx_constant_pool *pool;
3515 pool = GGC_NEW (struct rtx_constant_pool);
3516 pool->const_rtx_htab = htab_create_ggc (31, const_desc_rtx_hash,
3517 const_desc_rtx_eq, NULL);
3524 /* Initialize constant pool hashing for a new function. */
3527 init_varasm_status (void)
3529 crtl->varasm.pool = create_constant_pool ();
3530 crtl->varasm.deferred_constants = 0;
3533 /* Given a MINUS expression, simplify it if both sides
3534 include the same symbol. */
3537 simplify_subtraction (rtx x)
3539 rtx r = simplify_rtx (x);
3543 /* Given a constant rtx X, make (or find) a memory constant for its value
3544 and return a MEM rtx to refer to it in memory. */
3547 force_const_mem (enum machine_mode mode, rtx x)
3549 struct constant_descriptor_rtx *desc, tmp;
3550 struct rtx_constant_pool *pool;
3557 /* If we're not allowed to drop X into the constant pool, don't. */
3558 if (targetm.cannot_force_const_mem (x))
3561 /* Record that this function has used a constant pool entry. */
3562 crtl->uses_const_pool = 1;
3564 /* Decide which pool to use. */
3565 pool = (targetm.use_blocks_for_constant_p (mode, x)
3566 ? shared_constant_pool
3567 : crtl->varasm.pool);
3569 /* Lookup the value in the hashtable. */
3572 hash = const_rtx_hash (x);
3573 slot = htab_find_slot_with_hash (pool->const_rtx_htab, &tmp, hash, INSERT);
3574 desc = (struct constant_descriptor_rtx *) *slot;
3576 /* If the constant was already present, return its memory. */
3578 return copy_rtx (desc->mem);
3580 /* Otherwise, create a new descriptor. */
3581 desc = GGC_NEW (struct constant_descriptor_rtx);
3584 /* Align the location counter as required by EXP's data type. */
3585 align = GET_MODE_ALIGNMENT (mode == VOIDmode ? word_mode : mode);
3586 #ifdef CONSTANT_ALIGNMENT
3588 tree type = lang_hooks.types.type_for_mode (mode, 0);
3589 if (type != NULL_TREE)
3590 align = CONSTANT_ALIGNMENT (make_tree (type, x), align);
3594 pool->offset += (align / BITS_PER_UNIT) - 1;
3595 pool->offset &= ~ ((align / BITS_PER_UNIT) - 1);
3598 desc->constant = tmp.constant;
3599 desc->offset = pool->offset;
3602 desc->align = align;
3603 desc->labelno = const_labelno;
3606 pool->offset += GET_MODE_SIZE (mode);
3608 pool->last->next = desc;
3610 pool->first = pool->last = desc;
3613 /* Create a string containing the label name, in LABEL. */
3614 ASM_GENERATE_INTERNAL_LABEL (label, "LC", const_labelno);
3617 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3618 the constants pool. */
3619 if (use_object_blocks_p () && targetm.use_blocks_for_constant_p (mode, x))
3621 section *sect = targetm.asm_out.select_rtx_section (mode, x, align);
3622 symbol = create_block_symbol (ggc_strdup (label),
3623 get_block_for_section (sect), -1);
3626 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3628 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3629 CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3630 SET_SYMBOL_REF_CONSTANT (symbol, desc);
3632 /* Construct the MEM. */
3633 desc->mem = def = gen_const_mem (mode, symbol);
3634 set_mem_attributes (def, lang_hooks.types.type_for_mode (mode, 0), 1);
3635 set_mem_align (def, align);
3637 /* If we're dropping a label to the constant pool, make sure we
3639 if (GET_CODE (x) == LABEL_REF)
3640 LABEL_PRESERVE_P (XEXP (x, 0)) = 1;
3642 return copy_rtx (def);
3645 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3648 get_pool_constant (rtx addr)
3650 return SYMBOL_REF_CONSTANT (addr)->constant;
3653 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3654 and whether it has been output or not. */
3657 get_pool_constant_mark (rtx addr, bool *pmarked)
3659 struct constant_descriptor_rtx *desc;
3661 desc = SYMBOL_REF_CONSTANT (addr);
3662 *pmarked = (desc->mark != 0);
3663 return desc->constant;
3666 /* Similar, return the mode. */
3669 get_pool_mode (const_rtx addr)
3671 return SYMBOL_REF_CONSTANT (addr)->mode;
3674 /* Return the size of the constant pool. */
3677 get_pool_size (void)
3679 return crtl->varasm.pool->offset;
3682 /* Worker function for output_constant_pool_1. Emit assembly for X
3683 in MODE with known alignment ALIGN. */
3686 output_constant_pool_2 (enum machine_mode mode, rtx x, unsigned int align)
3688 switch (GET_MODE_CLASS (mode))
3691 case MODE_DECIMAL_FLOAT:
3695 gcc_assert (GET_CODE (x) == CONST_DOUBLE);
3696 REAL_VALUE_FROM_CONST_DOUBLE (r, x);
3697 assemble_real (r, mode, align);
3702 case MODE_PARTIAL_INT:
3707 assemble_integer (x, GET_MODE_SIZE (mode), align, 1);
3710 case MODE_VECTOR_FLOAT:
3711 case MODE_VECTOR_INT:
3712 case MODE_VECTOR_FRACT:
3713 case MODE_VECTOR_UFRACT:
3714 case MODE_VECTOR_ACCUM:
3715 case MODE_VECTOR_UACCUM:
3718 enum machine_mode submode = GET_MODE_INNER (mode);
3719 unsigned int subalign = MIN (align, GET_MODE_BITSIZE (submode));
3721 gcc_assert (GET_CODE (x) == CONST_VECTOR);
3722 units = CONST_VECTOR_NUNITS (x);
3724 for (i = 0; i < units; i++)
3726 rtx elt = CONST_VECTOR_ELT (x, i);
3727 output_constant_pool_2 (submode, elt, i ? subalign : align);
3737 /* Worker function for output_constant_pool. Emit constant DESC,
3738 giving it ALIGN bits of alignment. */
3741 output_constant_pool_1 (struct constant_descriptor_rtx *desc,
3748 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3749 whose CODE_LABEL has been deleted. This can occur if a jump table
3750 is eliminated by optimization. If so, write a constant of zero
3751 instead. Note that this can also happen by turning the
3752 CODE_LABEL into a NOTE. */
3753 /* ??? This seems completely and utterly wrong. Certainly it's
3754 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3755 functioning even with INSN_DELETED_P and friends. */
3758 switch (GET_CODE (tmp))
3761 if (GET_CODE (XEXP (tmp, 0)) != PLUS
3762 || GET_CODE (XEXP (XEXP (tmp, 0), 0)) != LABEL_REF)
3764 tmp = XEXP (XEXP (tmp, 0), 0);
3768 tmp = XEXP (tmp, 0);
3769 gcc_assert (!INSN_DELETED_P (tmp));
3770 gcc_assert (!NOTE_P (tmp)
3771 || NOTE_KIND (tmp) != NOTE_INSN_DELETED);
3778 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3779 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file, x, desc->mode,
3780 align, desc->labelno, done);
3783 assemble_align (align);
3785 /* Output the label. */
3786 targetm.asm_out.internal_label (asm_out_file, "LC", desc->labelno);
3788 /* Output the data. */
3789 output_constant_pool_2 (desc->mode, x, align);
3791 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3792 sections have proper size. */
3793 if (align > GET_MODE_BITSIZE (desc->mode)
3795 && (in_section->common.flags & SECTION_MERGE))
3796 assemble_align (align);
3798 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3804 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3805 to as used. Emit referenced deferred strings. This function can
3806 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3809 mark_constant (rtx *current_rtx, void *data ATTRIBUTE_UNUSED)
3811 rtx x = *current_rtx;
3813 if (x == NULL_RTX || GET_CODE (x) != SYMBOL_REF)
3816 if (CONSTANT_POOL_ADDRESS_P (x))
3818 struct constant_descriptor_rtx *desc = SYMBOL_REF_CONSTANT (x);
3819 if (desc->mark == 0)
3822 for_each_rtx (&desc->constant, mark_constant, NULL);
3825 else if (TREE_CONSTANT_POOL_ADDRESS_P (x))
3827 tree exp = SYMBOL_REF_DECL (x);
3828 if (!TREE_ASM_WRITTEN (exp))
3830 n_deferred_constants--;
3831 output_constant_def_contents (x);
3838 /* Look through appropriate parts of INSN, marking all entries in the
3839 constant pool which are actually being used. Entries that are only
3840 referenced by other constants are also marked as used. Emit
3841 deferred strings that are used. */
3844 mark_constants (rtx insn)
3849 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3850 insns, not any notes that may be attached. We don't want to mark
3851 a constant just because it happens to appear in a REG_EQUIV note. */
3852 if (GET_CODE (PATTERN (insn)) == SEQUENCE)
3854 rtx seq = PATTERN (insn);
3855 int i, n = XVECLEN (seq, 0);
3856 for (i = 0; i < n; ++i)
3858 rtx subinsn = XVECEXP (seq, 0, i);
3859 if (INSN_P (subinsn))
3860 for_each_rtx (&PATTERN (subinsn), mark_constant, NULL);
3864 for_each_rtx (&PATTERN (insn), mark_constant, NULL);
3867 /* Look through the instructions for this function, and mark all the
3868 entries in POOL which are actually being used. Emit deferred constants
3869 which have indeed been used. */
3872 mark_constant_pool (void)
3876 if (!crtl->uses_const_pool && n_deferred_constants == 0)
3879 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
3880 mark_constants (insn);
3882 for (link = crtl->epilogue_delay_list;
3884 link = XEXP (link, 1))
3885 mark_constants (XEXP (link, 0));
3888 /* Write all the constants in POOL. */
3891 output_constant_pool_contents (struct rtx_constant_pool *pool)
3893 struct constant_descriptor_rtx *desc;
3895 for (desc = pool->first; desc ; desc = desc->next)
3898 /* If the constant is part of an object_block, make sure that
3899 the constant has been positioned within its block, but do not
3900 write out its definition yet. output_object_blocks will do
3902 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc->sym)
3903 && SYMBOL_REF_BLOCK (desc->sym))
3904 place_block_symbol (desc->sym);
3907 switch_to_section (targetm.asm_out.select_rtx_section
3908 (desc->mode, desc->constant, desc->align));
3909 output_constant_pool_1 (desc, desc->align);
3914 /* Mark all constants that are used in the current function, then write
3915 out the function's private constant pool. */
3918 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED,
3919 tree fndecl ATTRIBUTE_UNUSED)
3921 struct rtx_constant_pool *pool = crtl->varasm.pool;
3923 /* It is possible for gcc to call force_const_mem and then to later
3924 discard the instructions which refer to the constant. In such a
3925 case we do not need to output the constant. */
3926 mark_constant_pool ();
3928 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3929 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file, fnname, fndecl, pool->offset);
3932 output_constant_pool_contents (pool);
3934 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3935 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file, fnname, fndecl, pool->offset);
3939 /* Write the contents of the shared constant pool. */
3942 output_shared_constant_pool (void)
3944 output_constant_pool_contents (shared_constant_pool);
3947 /* Determine what kind of relocations EXP may need. */
3950 compute_reloc_for_constant (tree exp)
3952 int reloc = 0, reloc2;
3955 switch (TREE_CODE (exp))
3959 /* Go inside any operations that get_inner_reference can handle and see
3960 if what's inside is a constant: no need to do anything here for
3961 addresses of variables or functions. */
3962 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
3963 tem = TREE_OPERAND (tem, 0))
3966 if (TREE_PUBLIC (tem))
3973 case POINTER_PLUS_EXPR:
3974 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3975 reloc |= compute_reloc_for_constant (TREE_OPERAND (exp, 1));
3979 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3980 reloc2 = compute_reloc_for_constant (TREE_OPERAND (exp, 1));
3981 /* The difference of two local labels is computable at link time. */
3982 if (reloc == 1 && reloc2 == 1)
3989 case VIEW_CONVERT_EXPR:
3990 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3995 unsigned HOST_WIDE_INT idx;
3996 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
3998 reloc |= compute_reloc_for_constant (tem);
4008 /* Find all the constants whose addresses are referenced inside of EXP,
4009 and make sure assembler code with a label has been output for each one.
4010 Indicate whether an ADDR_EXPR has been encountered. */
4013 output_addressed_constants (tree exp)
4017 switch (TREE_CODE (exp))
4021 /* Go inside any operations that get_inner_reference can handle and see
4022 if what's inside is a constant: no need to do anything here for
4023 addresses of variables or functions. */
4024 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
4025 tem = TREE_OPERAND (tem, 0))
4028 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4029 if (TREE_CODE (tem) == CONST_DECL && DECL_INITIAL (tem))
4030 tem = DECL_INITIAL (tem);
4032 if (CONSTANT_CLASS_P (tem) || TREE_CODE (tem) == CONSTRUCTOR)
4033 output_constant_def (tem, 0);
4037 case POINTER_PLUS_EXPR:
4039 output_addressed_constants (TREE_OPERAND (exp, 1));
4043 case VIEW_CONVERT_EXPR:
4044 output_addressed_constants (TREE_OPERAND (exp, 0));
4049 unsigned HOST_WIDE_INT idx;
4050 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
4052 output_addressed_constants (tem);
4061 /* Whether a constructor CTOR is a valid static constant initializer if all
4062 its elements are. This used to be internal to initializer_constant_valid_p
4063 and has been exposed to let other functions like categorize_ctor_elements
4064 evaluate the property while walking a constructor for other purposes. */
4067 constructor_static_from_elts_p (const_tree ctor)
4069 return (TREE_CONSTANT (ctor)
4070 && (TREE_CODE (TREE_TYPE (ctor)) == UNION_TYPE
4071 || TREE_CODE (TREE_TYPE (ctor)) == RECORD_TYPE)
4072 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (ctor)));
4075 static tree initializer_constant_valid_p_1 (tree value, tree endtype,
4078 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4079 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4080 which are valid when ENDTYPE is an integer of any size; in
4081 particular, this does not accept a pointer minus a constant. This
4082 returns null_pointer_node if the VALUE is an absolute constant
4083 which can be used to initialize a static variable. Otherwise it
4087 narrowing_initializer_constant_valid_p (tree value, tree endtype, tree *cache)
4091 if (!INTEGRAL_TYPE_P (endtype))
4094 op0 = TREE_OPERAND (value, 0);
4095 op1 = TREE_OPERAND (value, 1);
4097 /* Like STRIP_NOPS except allow the operand mode to widen. This
4098 works around a feature of fold that simplifies (int)(p1 - p2) to
4099 ((int)p1 - (int)p2) under the theory that the narrower operation
4102 while (CONVERT_EXPR_P (op0)
4103 || TREE_CODE (op0) == NON_LVALUE_EXPR)
4105 tree inner = TREE_OPERAND (op0, 0);
4106 if (inner == error_mark_node
4107 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
4108 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0)))
4109 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
4114 while (CONVERT_EXPR_P (op1)
4115 || TREE_CODE (op1) == NON_LVALUE_EXPR)
4117 tree inner = TREE_OPERAND (op1, 0);
4118 if (inner == error_mark_node
4119 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
4120 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1)))
4121 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
4126 op0 = initializer_constant_valid_p_1 (op0, endtype, cache);
4130 op1 = initializer_constant_valid_p_1 (op1, endtype,
4131 cache ? cache + 2 : NULL);
4132 /* Both initializers must be known. */
4136 && (op0 == null_pointer_node
4137 || TREE_CODE (value) == MINUS_EXPR))
4138 return null_pointer_node;
4140 /* Support differences between labels. */
4141 if (TREE_CODE (op0) == LABEL_DECL
4142 && TREE_CODE (op1) == LABEL_DECL)
4143 return null_pointer_node;
4145 if (TREE_CODE (op0) == STRING_CST
4146 && TREE_CODE (op1) == STRING_CST
4147 && operand_equal_p (op0, op1, 1))
4148 return null_pointer_node;
4154 /* Helper function of initializer_constant_valid_p.
4155 Return nonzero if VALUE is a valid constant-valued expression
4156 for use in initializing a static variable; one that can be an
4157 element of a "constant" initializer.
4159 Return null_pointer_node if the value is absolute;
4160 if it is relocatable, return the variable that determines the relocation.
4161 We assume that VALUE has been folded as much as possible;
4162 therefore, we do not need to check for such things as
4163 arithmetic-combinations of integers.
4165 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4168 initializer_constant_valid_p_1 (tree value, tree endtype, tree *cache)
4172 switch (TREE_CODE (value))
4175 if (constructor_static_from_elts_p (value))
4177 unsigned HOST_WIDE_INT idx;
4179 bool absolute = true;
4181 if (cache && cache[0] == value)
4183 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value), idx, elt)
4186 reloc = initializer_constant_valid_p_1 (elt, TREE_TYPE (elt),
4193 cache[1] = NULL_TREE;
4197 if (reloc != null_pointer_node)
4200 /* For a non-absolute relocation, there is no single
4201 variable that can be "the variable that determines the
4206 cache[1] = absolute ? null_pointer_node : error_mark_node;
4208 return absolute ? null_pointer_node : error_mark_node;
4211 return TREE_STATIC (value) ? null_pointer_node : NULL_TREE;
4219 return null_pointer_node;
4224 tree op0 = staticp (TREE_OPERAND (value, 0));
4227 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4228 to be a constant, this is old-skool offsetof-like nonsense. */
4229 if (TREE_CODE (op0) == INDIRECT_REF
4230 && TREE_CONSTANT (TREE_OPERAND (op0, 0)))
4231 return null_pointer_node;
4232 /* Taking the address of a nested function involves a trampoline,
4233 unless we don't need or want one. */
4234 if (TREE_CODE (op0) == FUNCTION_DECL
4235 && decl_function_context (op0)
4236 && !DECL_NO_STATIC_CHAIN (op0)
4237 && !TREE_NO_TRAMPOLINE (value))
4239 /* "&{...}" requires a temporary to hold the constructed
4241 if (TREE_CODE (op0) == CONSTRUCTOR)
4247 case NON_LVALUE_EXPR:
4248 return initializer_constant_valid_p_1 (TREE_OPERAND (value, 0),
4251 case VIEW_CONVERT_EXPR:
4253 tree src = TREE_OPERAND (value, 0);
4254 tree src_type = TREE_TYPE (src);
4255 tree dest_type = TREE_TYPE (value);
4257 /* Allow view-conversions from aggregate to non-aggregate type only
4258 if the bit pattern is fully preserved afterwards; otherwise, the
4259 RTL expander won't be able to apply a subsequent transformation
4260 to the underlying constructor. */
4261 if (AGGREGATE_TYPE_P (src_type) && !AGGREGATE_TYPE_P (dest_type))
4263 if (TYPE_MODE (endtype) == TYPE_MODE (dest_type))
4264 return initializer_constant_valid_p_1 (src, endtype, cache);
4269 /* Allow all other kinds of view-conversion. */
4270 return initializer_constant_valid_p_1 (src, endtype, cache);
4275 tree src = TREE_OPERAND (value, 0);
4276 tree src_type = TREE_TYPE (src);
4277 tree dest_type = TREE_TYPE (value);
4279 /* Allow conversions between pointer types, floating-point
4280 types, and offset types. */
4281 if ((POINTER_TYPE_P (dest_type) && POINTER_TYPE_P (src_type))
4282 || (FLOAT_TYPE_P (dest_type) && FLOAT_TYPE_P (src_type))
4283 || (TREE_CODE (dest_type) == OFFSET_TYPE
4284 && TREE_CODE (src_type) == OFFSET_TYPE))
4285 return initializer_constant_valid_p_1 (src, endtype, cache);
4287 /* Allow length-preserving conversions between integer types. */
4288 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type)
4289 && (TYPE_PRECISION (dest_type) == TYPE_PRECISION (src_type)))
4290 return initializer_constant_valid_p_1 (src, endtype, cache);
4292 /* Allow conversions between other integer types only if
4294 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type))
4296 tree inner = initializer_constant_valid_p_1 (src, endtype, cache);
4297 if (inner == null_pointer_node)
4298 return null_pointer_node;
4302 /* Allow (int) &foo provided int is as wide as a pointer. */
4303 if (INTEGRAL_TYPE_P (dest_type) && POINTER_TYPE_P (src_type)
4304 && (TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type)))
4305 return initializer_constant_valid_p_1 (src, endtype, cache);
4307 /* Likewise conversions from int to pointers, but also allow
4308 conversions from 0. */
4309 if ((POINTER_TYPE_P (dest_type)
4310 || TREE_CODE (dest_type) == OFFSET_TYPE)
4311 && INTEGRAL_TYPE_P (src_type))
4313 if (TREE_CODE (src) == INTEGER_CST
4314 && TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type))
4315 return null_pointer_node;
4316 if (integer_zerop (src))
4317 return null_pointer_node;
4318 else if (TYPE_PRECISION (dest_type) <= TYPE_PRECISION (src_type))
4319 return initializer_constant_valid_p_1 (src, endtype, cache);
4322 /* Allow conversions to struct or union types if the value
4324 if (TREE_CODE (dest_type) == RECORD_TYPE
4325 || TREE_CODE (dest_type) == UNION_TYPE)
4326 return initializer_constant_valid_p_1 (src, endtype, cache);
4330 case POINTER_PLUS_EXPR:
4332 /* Any valid floating-point constants will have been folded by now;
4333 with -frounding-math we hit this with addition of two constants. */
4334 if (TREE_CODE (endtype) == REAL_TYPE)
4336 if (cache && cache[0] == value)
4338 if (! INTEGRAL_TYPE_P (endtype)
4339 || TYPE_PRECISION (endtype) >= POINTER_SIZE)
4341 tree ncache[4] = { NULL_TREE, NULL_TREE, NULL_TREE, NULL_TREE };
4343 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 0),
4346 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 1),
4347 endtype, ncache + 2);
4348 /* If either term is absolute, use the other term's relocation. */
4349 if (valid0 == null_pointer_node)
4351 else if (valid1 == null_pointer_node)
4353 /* Support narrowing pointer differences. */
4355 ret = narrowing_initializer_constant_valid_p (value, endtype,
4359 /* Support narrowing pointer differences. */
4360 ret = narrowing_initializer_constant_valid_p (value, endtype, NULL);
4369 if (TREE_CODE (endtype) == REAL_TYPE)
4371 if (cache && cache[0] == value)
4373 if (! INTEGRAL_TYPE_P (endtype)
4374 || TYPE_PRECISION (endtype) >= POINTER_SIZE)
4376 tree ncache[4] = { NULL_TREE, NULL_TREE, NULL_TREE, NULL_TREE };
4378 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 0),
4381 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 1),
4382 endtype, ncache + 2);
4383 /* Win if second argument is absolute. */
4384 if (valid1 == null_pointer_node)
4386 /* Win if both arguments have the same relocation.
4387 Then the value is absolute. */
4388 else if (valid0 == valid1 && valid0 != 0)
4389 ret = null_pointer_node;
4390 /* Since GCC guarantees that string constants are unique in the
4391 generated code, a subtraction between two copies of the same
4392 constant string is absolute. */
4393 else if (valid0 && TREE_CODE (valid0) == STRING_CST
4394 && valid1 && TREE_CODE (valid1) == STRING_CST
4395 && operand_equal_p (valid0, valid1, 1))
4396 ret = null_pointer_node;
4397 /* Support narrowing differences. */
4399 ret = narrowing_initializer_constant_valid_p (value, endtype,
4403 /* Support narrowing differences. */
4404 ret = narrowing_initializer_constant_valid_p (value, endtype, NULL);
4419 /* Return nonzero if VALUE is a valid constant-valued expression
4420 for use in initializing a static variable; one that can be an
4421 element of a "constant" initializer.
4423 Return null_pointer_node if the value is absolute;
4424 if it is relocatable, return the variable that determines the relocation.
4425 We assume that VALUE has been folded as much as possible;
4426 therefore, we do not need to check for such things as
4427 arithmetic-combinations of integers. */
4429 initializer_constant_valid_p (tree value, tree endtype)
4431 return initializer_constant_valid_p_1 (value, endtype, NULL);
4434 /* Output assembler code for constant EXP to FILE, with no label.
4435 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4436 Assumes output_addressed_constants has been done on EXP already.
4438 Generate exactly SIZE bytes of assembler data, padding at the end
4439 with zeros if necessary. SIZE must always be specified.
4441 SIZE is important for structure constructors,
4442 since trailing members may have been omitted from the constructor.
4443 It is also important for initialization of arrays from string constants
4444 since the full length of the string constant might not be wanted.
4445 It is also needed for initialization of unions, where the initializer's
4446 type is just one member, and that may not be as long as the union.
4448 There a case in which we would fail to output exactly SIZE bytes:
4449 for a structure constructor that wants to produce more than SIZE bytes.
4450 But such constructors will never be generated for any possible input.
4452 ALIGN is the alignment of the data in bits. */
4455 output_constant (tree exp, unsigned HOST_WIDE_INT size, unsigned int align)
4457 enum tree_code code;
4458 unsigned HOST_WIDE_INT thissize;
4460 if (size == 0 || flag_syntax_only)
4463 /* See if we're trying to initialize a pointer in a non-default mode
4464 to the address of some declaration somewhere. If the target says
4465 the mode is valid for pointers, assume the target has a way of
4467 if (TREE_CODE (exp) == NOP_EXPR
4468 && POINTER_TYPE_P (TREE_TYPE (exp))
4469 && targetm.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp))))
4471 tree saved_type = TREE_TYPE (exp);
4473 /* Peel off any intermediate conversions-to-pointer for valid
4475 while (TREE_CODE (exp) == NOP_EXPR
4476 && POINTER_TYPE_P (TREE_TYPE (exp))
4477 && targetm.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp))))
4478 exp = TREE_OPERAND (exp, 0);
4480 /* If what we're left with is the address of something, we can
4481 convert the address to the final type and output it that
4483 if (TREE_CODE (exp) == ADDR_EXPR)
4484 exp = build1 (ADDR_EXPR, saved_type, TREE_OPERAND (exp, 0));
4485 /* Likewise for constant ints. */
4486 else if (TREE_CODE (exp) == INTEGER_CST)
4487 exp = build_int_cst_wide (saved_type, TREE_INT_CST_LOW (exp),
4488 TREE_INT_CST_HIGH (exp));
4492 /* Eliminate any conversions since we'll be outputting the underlying
4494 while (CONVERT_EXPR_P (exp)
4495 || TREE_CODE (exp) == NON_LVALUE_EXPR
4496 || TREE_CODE (exp) == VIEW_CONVERT_EXPR)
4498 HOST_WIDE_INT type_size = int_size_in_bytes (TREE_TYPE (exp));
4499 HOST_WIDE_INT op_size = int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp, 0)));
4501 /* Make sure eliminating the conversion is really a no-op, except with
4502 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4503 union types to allow for Ada unchecked unions. */
4504 if (type_size > op_size
4505 && TREE_CODE (exp) != VIEW_CONVERT_EXPR
4506 && TREE_CODE (TREE_TYPE (exp)) != UNION_TYPE)
4507 /* Keep the conversion. */
4510 exp = TREE_OPERAND (exp, 0);
4513 code = TREE_CODE (TREE_TYPE (exp));
4514 thissize = int_size_in_bytes (TREE_TYPE (exp));
4516 /* Allow a constructor with no elements for any data type.
4517 This means to fill the space with zeros. */
4518 if (TREE_CODE (exp) == CONSTRUCTOR
4519 && VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (exp)))
4521 assemble_zeros (size);
4525 if (TREE_CODE (exp) == FDESC_EXPR)
4527 #ifdef ASM_OUTPUT_FDESC
4528 HOST_WIDE_INT part = tree_low_cst (TREE_OPERAND (exp, 1), 0);
4529 tree decl = TREE_OPERAND (exp, 0);
4530 ASM_OUTPUT_FDESC (asm_out_file, decl, part);
4537 /* Now output the underlying data. If we've handling the padding, return.
4538 Otherwise, break and ensure SIZE is the size written. */
4545 case REFERENCE_TYPE:
4547 case FIXED_POINT_TYPE:
4548 if (! assemble_integer (expand_expr (exp, NULL_RTX, VOIDmode,
4549 EXPAND_INITIALIZER),
4550 MIN (size, thissize), align, 0))
4551 error ("initializer for integer/fixed-point value is too complicated");
4555 if (TREE_CODE (exp) != REAL_CST)
4556 error ("initializer for floating value is not a floating constant");
4558 assemble_real (TREE_REAL_CST (exp), TYPE_MODE (TREE_TYPE (exp)), align);
4562 output_constant (TREE_REALPART (exp), thissize / 2, align);
4563 output_constant (TREE_IMAGPART (exp), thissize / 2,
4564 min_align (align, BITS_PER_UNIT * (thissize / 2)));
4569 switch (TREE_CODE (exp))
4572 output_constructor (exp, size, align);
4575 thissize = MIN ((unsigned HOST_WIDE_INT)TREE_STRING_LENGTH (exp),
4577 assemble_string (TREE_STRING_POINTER (exp), thissize);
4584 unsigned int nalign;
4585 enum machine_mode inner;
4587 inner = TYPE_MODE (TREE_TYPE (TREE_TYPE (exp)));
4588 nalign = MIN (align, GET_MODE_ALIGNMENT (inner));
4590 elt_size = GET_MODE_SIZE (inner);
4592 link = TREE_VECTOR_CST_ELTS (exp);
4593 output_constant (TREE_VALUE (link), elt_size, align);
4594 thissize = elt_size;
4595 while ((link = TREE_CHAIN (link)) != NULL)
4597 output_constant (TREE_VALUE (link), elt_size, nalign);
4598 thissize += elt_size;
4609 gcc_assert (TREE_CODE (exp) == CONSTRUCTOR);
4610 output_constructor (exp, size, align);
4620 if (size > thissize)
4621 assemble_zeros (size - thissize);
4625 /* Subroutine of output_constructor, used for computing the size of
4626 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4627 type with an unspecified upper bound. */
4629 static unsigned HOST_WIDE_INT
4630 array_size_for_constructor (tree val)
4633 unsigned HOST_WIDE_INT cnt;
4634 tree index, value, tmp;
4636 /* This code used to attempt to handle string constants that are not
4637 arrays of single-bytes, but nothing else does, so there's no point in
4639 if (TREE_CODE (val) == STRING_CST)
4640 return TREE_STRING_LENGTH (val);
4642 max_index = NULL_TREE;
4643 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val), cnt, index, value)
4645 if (TREE_CODE (index) == RANGE_EXPR)
4646 index = TREE_OPERAND (index, 1);
4647 if (max_index == NULL_TREE || tree_int_cst_lt (max_index, index))
4651 if (max_index == NULL_TREE)
4654 /* Compute the total number of array elements. */
4655 tmp = TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val)));
4656 i = size_binop (MINUS_EXPR, fold_convert (sizetype, max_index),
4657 fold_convert (sizetype, tmp));
4658 i = size_binop (PLUS_EXPR, i, build_int_cst (sizetype, 1));
4660 /* Multiply by the array element unit size to find number of bytes. */
4661 i = size_binop (MULT_EXPR, i, TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val))));
4663 return tree_low_cst (i, 1);
4666 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
4667 Generate at least SIZE bytes, padding if necessary. */
4670 output_constructor (tree exp, unsigned HOST_WIDE_INT size,
4673 tree type = TREE_TYPE (exp);
4676 /* Number of bytes output or skipped so far.
4677 In other words, current position within the constructor. */
4678 HOST_WIDE_INT total_bytes = 0;
4679 /* Nonzero means BYTE contains part of a byte, to be output. */
4680 int byte_buffer_in_use = 0;
4682 unsigned HOST_WIDE_INT cnt;
4683 constructor_elt *ce;
4685 gcc_assert (HOST_BITS_PER_WIDE_INT >= BITS_PER_UNIT);
4687 if (TREE_CODE (type) == RECORD_TYPE)
4688 field = TYPE_FIELDS (type);
4690 if (TREE_CODE (type) == ARRAY_TYPE
4691 && TYPE_DOMAIN (type) != 0)
4692 min_index = TYPE_MIN_VALUE (TYPE_DOMAIN (type));
4694 /* As LINK goes through the elements of the constant,
4695 FIELD goes through the structure fields, if the constant is a structure.
4696 if the constant is a union, then we override this,
4697 by getting the field from the TREE_LIST element.
4698 But the constant could also be an array. Then FIELD is zero.
4700 There is always a maximum of one element in the chain LINK for unions
4701 (even if the initializer in a source program incorrectly contains
4704 VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (exp), cnt, ce);
4705 cnt++, field = field ? TREE_CHAIN (field) : 0)
4707 tree val = ce->value;
4710 /* The element in a union constructor specifies the proper field
4712 if ((TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE
4713 || TREE_CODE (type) == QUAL_UNION_TYPE)
4717 else if (TREE_CODE (type) == ARRAY_TYPE)
4720 #ifdef ASM_COMMENT_START
4721 if (field && flag_verbose_asm)
4722 fprintf (asm_out_file, "%s %s:\n",
4725 ? IDENTIFIER_POINTER (DECL_NAME (field))
4729 /* Eliminate the marker that makes a cast not be an lvalue. */
4733 if (index && TREE_CODE (index) == RANGE_EXPR)
4735 unsigned HOST_WIDE_INT fieldsize
4736 = int_size_in_bytes (TREE_TYPE (type));
4737 HOST_WIDE_INT lo_index = tree_low_cst (TREE_OPERAND (index, 0), 0);
4738 HOST_WIDE_INT hi_index = tree_low_cst (TREE_OPERAND (index, 1), 0);
4739 HOST_WIDE_INT index;
4740 unsigned int align2 = min_align (align, fieldsize * BITS_PER_UNIT);
4742 for (index = lo_index; index <= hi_index; index++)
4744 /* Output the element's initial value. */
4746 assemble_zeros (fieldsize);
4748 output_constant (val, fieldsize, align2);
4750 /* Count its size. */
4751 total_bytes += fieldsize;
4754 else if (field == 0 || !DECL_BIT_FIELD (field))
4756 /* An element that is not a bit-field. */
4758 unsigned HOST_WIDE_INT fieldsize;
4759 /* Since this structure is static,
4760 we know the positions are constant. */
4761 HOST_WIDE_INT pos = field ? int_byte_position (field) : 0;
4762 unsigned int align2;
4765 pos = (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (val)), 1)
4766 * (tree_low_cst (index, 0) - tree_low_cst (min_index, 0)));
4768 /* Output any buffered-up bit-fields preceding this element. */
4769 if (byte_buffer_in_use)
4771 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4773 byte_buffer_in_use = 0;
4776 /* Advance to offset of this element.
4777 Note no alignment needed in an array, since that is guaranteed
4778 if each element has the proper size. */
4779 if ((field != 0 || index != 0) && pos != total_bytes)
4781 gcc_assert (pos >= total_bytes);
4782 assemble_zeros (pos - total_bytes);
4786 /* Find the alignment of this element. */
4787 align2 = min_align (align, BITS_PER_UNIT * pos);
4789 /* Determine size this element should occupy. */
4794 /* If this is an array with an unspecified upper bound,
4795 the initializer determines the size. */
4796 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4797 but we cannot do this until the deprecated support for
4798 initializing zero-length array members is removed. */
4799 if (TREE_CODE (TREE_TYPE (field)) == ARRAY_TYPE
4800 && TYPE_DOMAIN (TREE_TYPE (field))
4801 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (field))))
4803 fieldsize = array_size_for_constructor (val);
4804 /* Given a non-empty initialization, this field had
4806 gcc_assert (!fieldsize || !TREE_CHAIN (field));
4808 else if (DECL_SIZE_UNIT (field))
4810 /* ??? This can't be right. If the decl size overflows
4811 a host integer we will silently emit no data. */
4812 if (host_integerp (DECL_SIZE_UNIT (field), 1))
4813 fieldsize = tree_low_cst (DECL_SIZE_UNIT (field), 1);
4817 fieldsize = int_size_in_bytes (TREE_TYPE (type));
4819 /* Output the element's initial value. */
4821 assemble_zeros (fieldsize);
4823 output_constant (val, fieldsize, align2);
4825 /* Count its size. */
4826 total_bytes += fieldsize;
4828 else if (val != 0 && TREE_CODE (val) != INTEGER_CST)
4829 error ("invalid initial value for member %qs",
4830 IDENTIFIER_POINTER (DECL_NAME (field)));
4833 /* Element that is a bit-field. */
4835 HOST_WIDE_INT next_offset = int_bit_position (field);
4836 HOST_WIDE_INT end_offset
4837 = (next_offset + tree_low_cst (DECL_SIZE (field), 1));
4840 val = integer_zero_node;
4842 /* If this field does not start in this (or, next) byte,
4844 if (next_offset / BITS_PER_UNIT != total_bytes)
4846 /* Output remnant of any bit field in previous bytes. */
4847 if (byte_buffer_in_use)
4849 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4851 byte_buffer_in_use = 0;
4854 /* If still not at proper byte, advance to there. */
4855 if (next_offset / BITS_PER_UNIT != total_bytes)
4857 gcc_assert (next_offset / BITS_PER_UNIT >= total_bytes);
4858 assemble_zeros (next_offset / BITS_PER_UNIT - total_bytes);
4859 total_bytes = next_offset / BITS_PER_UNIT;
4863 if (! byte_buffer_in_use)
4866 /* We must split the element into pieces that fall within
4867 separate bytes, and combine each byte with previous or
4868 following bit-fields. */
4870 /* next_offset is the offset n fbits from the beginning of
4871 the structure to the next bit of this element to be processed.
4872 end_offset is the offset of the first bit past the end of
4874 while (next_offset < end_offset)
4878 HOST_WIDE_INT value;
4879 HOST_WIDE_INT next_byte = next_offset / BITS_PER_UNIT;
4880 HOST_WIDE_INT next_bit = next_offset % BITS_PER_UNIT;
4882 /* Advance from byte to byte
4883 within this element when necessary. */
4884 while (next_byte != total_bytes)
4886 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4891 /* Number of bits we can process at once
4892 (all part of the same byte). */
4893 this_time = MIN (end_offset - next_offset,
4894 BITS_PER_UNIT - next_bit);
4895 if (BYTES_BIG_ENDIAN)
4897 /* On big-endian machine, take the most significant bits
4898 first (of the bits that are significant)
4899 and put them into bytes from the most significant end. */
4900 shift = end_offset - next_offset - this_time;
4902 /* Don't try to take a bunch of bits that cross
4903 the word boundary in the INTEGER_CST. We can
4904 only select bits from the LOW or HIGH part
4906 if (shift < HOST_BITS_PER_WIDE_INT
4907 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4909 this_time = shift + this_time - HOST_BITS_PER_WIDE_INT;
4910 shift = HOST_BITS_PER_WIDE_INT;
4913 /* Now get the bits from the appropriate constant word. */
4914 if (shift < HOST_BITS_PER_WIDE_INT)
4915 value = TREE_INT_CST_LOW (val);
4918 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
4919 value = TREE_INT_CST_HIGH (val);
4920 shift -= HOST_BITS_PER_WIDE_INT;
4923 /* Get the result. This works only when:
4924 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4925 byte |= (((value >> shift)
4926 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
4927 << (BITS_PER_UNIT - this_time - next_bit));
4931 /* On little-endian machines,
4932 take first the least significant bits of the value
4933 and pack them starting at the least significant
4934 bits of the bytes. */
4935 shift = next_offset - int_bit_position (field);
4937 /* Don't try to take a bunch of bits that cross
4938 the word boundary in the INTEGER_CST. We can
4939 only select bits from the LOW or HIGH part
4941 if (shift < HOST_BITS_PER_WIDE_INT
4942 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4943 this_time = (HOST_BITS_PER_WIDE_INT - shift);
4945 /* Now get the bits from the appropriate constant word. */
4946 if (shift < HOST_BITS_PER_WIDE_INT)
4947 value = TREE_INT_CST_LOW (val);
4950 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
4951 value = TREE_INT_CST_HIGH (val);
4952 shift -= HOST_BITS_PER_WIDE_INT;
4955 /* Get the result. This works only when:
4956 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4957 byte |= (((value >> shift)
4958 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
4962 next_offset += this_time;
4963 byte_buffer_in_use = 1;
4968 if (byte_buffer_in_use)
4970 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4974 if ((unsigned HOST_WIDE_INT)total_bytes < size)
4975 assemble_zeros (size - total_bytes);
4978 /* Mark DECL as weak. */
4981 mark_weak (tree decl)
4983 DECL_WEAK (decl) = 1;
4985 if (DECL_RTL_SET_P (decl)
4986 && MEM_P (DECL_RTL (decl))
4987 && XEXP (DECL_RTL (decl), 0)
4988 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == SYMBOL_REF)
4989 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl), 0)) = 1;
4992 /* Merge weak status between NEWDECL and OLDDECL. */
4995 merge_weak (tree newdecl, tree olddecl)
4997 if (DECL_WEAK (newdecl) == DECL_WEAK (olddecl))
4999 if (DECL_WEAK (newdecl) && SUPPORTS_WEAK)
5002 /* We put the NEWDECL on the weak_decls list at some point
5003 and OLDDECL as well. Keep just OLDDECL on the list. */
5004 for (pwd = &weak_decls; *pwd; pwd = &TREE_CHAIN (*pwd))
5005 if (TREE_VALUE (*pwd) == newdecl)
5007 *pwd = TREE_CHAIN (*pwd);
5014 if (DECL_WEAK (newdecl))
5018 /* NEWDECL is weak, but OLDDECL is not. */
5020 /* If we already output the OLDDECL, we're in trouble; we can't
5021 go back and make it weak. This error cannot be caught in
5022 declare_weak because the NEWDECL and OLDDECL was not yet
5023 been merged; therefore, TREE_ASM_WRITTEN was not set. */
5024 if (TREE_ASM_WRITTEN (olddecl))
5025 error ("weak declaration of %q+D must precede definition",
5028 /* If we've already generated rtl referencing OLDDECL, we may
5029 have done so in a way that will not function properly with
5031 else if (TREE_USED (olddecl)
5032 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl)))
5033 warning (0, "weak declaration of %q+D after first use results "
5034 "in unspecified behavior", newdecl);
5038 /* We put the NEWDECL on the weak_decls list at some point.
5039 Replace it with the OLDDECL. */
5040 for (wd = weak_decls; wd; wd = TREE_CHAIN (wd))
5041 if (TREE_VALUE (wd) == newdecl)
5043 TREE_VALUE (wd) = olddecl;
5046 /* We may not find the entry on the list. If NEWDECL is a
5047 weak alias, then we will have already called
5048 globalize_decl to remove the entry; in that case, we do
5049 not need to do anything. */
5052 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5053 mark_weak (olddecl);
5056 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5057 weak. Just update NEWDECL to indicate that it's weak too. */
5058 mark_weak (newdecl);
5061 /* Declare DECL to be a weak symbol. */
5064 declare_weak (tree decl)
5066 if (! TREE_PUBLIC (decl))
5067 error ("weak declaration of %q+D must be public", decl);
5068 else if (TREE_CODE (decl) == FUNCTION_DECL && TREE_ASM_WRITTEN (decl))
5069 error ("weak declaration of %q+D must precede definition", decl);
5070 else if (!SUPPORTS_WEAK)
5071 warning (0, "weak declaration of %q+D not supported", decl);
5074 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl)))
5075 DECL_ATTRIBUTES (decl)
5076 = tree_cons (get_identifier ("weak"), NULL, DECL_ATTRIBUTES (decl));
5080 weak_finish_1 (tree decl)
5082 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5083 const char *const name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5086 if (! TREE_USED (decl))
5089 #ifdef ASM_WEAKEN_DECL
5090 ASM_WEAKEN_DECL (asm_out_file, decl, name, NULL);
5092 #ifdef ASM_WEAKEN_LABEL
5093 ASM_WEAKEN_LABEL (asm_out_file, name);
5095 #ifdef ASM_OUTPUT_WEAK_ALIAS
5097 static bool warn_once = 0;
5100 warning (0, "only weak aliases are supported in this configuration");
5110 /* This TREE_LIST contains weakref targets. */
5112 static GTY(()) tree weakref_targets;
5114 /* Forward declaration. */
5115 static tree find_decl_and_mark_needed (tree decl, tree target);
5117 /* Emit any pending weak declarations. */
5124 for (t = weakref_targets; t; t = TREE_CHAIN (t))
5126 tree alias_decl = TREE_PURPOSE (t);
5127 tree target = ultimate_transparent_alias_target (&TREE_VALUE (t));
5129 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl)))
5130 /* Remove alias_decl from the weak list, but leave entries for
5131 the target alone. */
5133 #ifndef ASM_OUTPUT_WEAKREF
5134 else if (! TREE_SYMBOL_REFERENCED (target))
5136 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5137 defined, otherwise we and weak_finish_1 would use
5138 different macros. */
5139 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5140 ASM_WEAKEN_LABEL (asm_out_file, IDENTIFIER_POINTER (target));
5142 tree decl = find_decl_and_mark_needed (alias_decl, target);
5146 decl = build_decl (TREE_CODE (alias_decl), target,
5147 TREE_TYPE (alias_decl));
5149 DECL_EXTERNAL (decl) = 1;
5150 TREE_PUBLIC (decl) = 1;
5151 DECL_ARTIFICIAL (decl) = 1;
5152 TREE_NOTHROW (decl) = TREE_NOTHROW (alias_decl);
5153 TREE_USED (decl) = 1;
5156 weak_finish_1 (decl);
5165 /* Remove the alias and the target from the pending weak list
5166 so that we do not emit any .weak directives for the former,
5167 nor multiple .weak directives for the latter. */
5168 for (p = &weak_decls; (t2 = *p) ; )
5170 if (TREE_VALUE (t2) == alias_decl
5171 || target == DECL_ASSEMBLER_NAME (TREE_VALUE (t2)))
5172 *p = TREE_CHAIN (t2);
5174 p = &TREE_CHAIN (t2);
5177 /* Remove other weakrefs to the same target, to speed things up. */
5178 for (p = &TREE_CHAIN (t); (t2 = *p) ; )
5180 if (target == ultimate_transparent_alias_target (&TREE_VALUE (t2)))
5181 *p = TREE_CHAIN (t2);
5183 p = &TREE_CHAIN (t2);
5188 for (t = weak_decls; t; t = TREE_CHAIN (t))
5190 tree decl = TREE_VALUE (t);
5192 weak_finish_1 (decl);
5196 /* Emit the assembly bits to indicate that DECL is globally visible. */
5199 globalize_decl (tree decl)
5202 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5203 if (DECL_WEAK (decl))
5205 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
5208 #ifdef ASM_WEAKEN_DECL
5209 ASM_WEAKEN_DECL (asm_out_file, decl, name, 0);
5211 ASM_WEAKEN_LABEL (asm_out_file, name);
5214 /* Remove this function from the pending weak list so that
5215 we do not emit multiple .weak directives for it. */
5216 for (p = &weak_decls; (t = *p) ; )
5218 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
5219 *p = TREE_CHAIN (t);
5221 p = &TREE_CHAIN (t);
5224 /* Remove weakrefs to the same target from the pending weakref
5225 list, for the same reason. */
5226 for (p = &weakref_targets; (t = *p) ; )
5228 if (DECL_ASSEMBLER_NAME (decl)
5229 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
5230 *p = TREE_CHAIN (t);
5232 p = &TREE_CHAIN (t);
5239 targetm.asm_out.globalize_decl_name (asm_out_file, decl);
5242 /* We have to be able to tell cgraph about the needed-ness of the target
5243 of an alias. This requires that the decl have been defined. Aliases
5244 that precede their definition have to be queued for later processing. */
5246 typedef struct alias_pair GTY(())
5252 /* Define gc'd vector type. */
5253 DEF_VEC_O(alias_pair);
5254 DEF_VEC_ALLOC_O(alias_pair,gc);
5256 static GTY(()) VEC(alias_pair,gc) *alias_pairs;
5258 /* Given an assembly name, find the decl it is associated with. At the
5259 same time, mark it needed for cgraph. */
5262 find_decl_and_mark_needed (tree decl, tree target)
5264 struct cgraph_node *fnode = NULL;
5265 struct varpool_node *vnode = NULL;
5267 if (TREE_CODE (decl) == FUNCTION_DECL)
5269 fnode = cgraph_node_for_asm (target);
5271 vnode = varpool_node_for_asm (target);
5275 vnode = varpool_node_for_asm (target);
5277 fnode = cgraph_node_for_asm (target);
5282 /* We can't mark function nodes as used after cgraph global info
5283 is finished. This wouldn't generally be necessary, but C++
5284 virtual table thunks are introduced late in the game and
5285 might seem like they need marking, although in fact they
5287 if (! cgraph_global_info_ready)
5288 cgraph_mark_needed_node (fnode);
5293 varpool_mark_needed_node (vnode);
5300 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5301 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5302 tree node is DECL to have the value of the tree node TARGET. */
5305 do_assemble_alias (tree decl, tree target)
5307 if (TREE_ASM_WRITTEN (decl))
5310 TREE_ASM_WRITTEN (decl) = 1;
5311 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl)) = 1;
5313 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
5315 ultimate_transparent_alias_target (&target);
5317 if (!targetm.have_tls
5318 && TREE_CODE (decl) == VAR_DECL
5319 && DECL_THREAD_LOCAL_P (decl))
5321 decl = emutls_decl (decl);
5322 target = get_emutls_object_name (target);
5325 if (!TREE_SYMBOL_REFERENCED (target))
5326 weakref_targets = tree_cons (decl, target, weakref_targets);
5328 #ifdef ASM_OUTPUT_WEAKREF
5329 ASM_OUTPUT_WEAKREF (asm_out_file, decl,
5330 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
5331 IDENTIFIER_POINTER (target));
5335 error ("%Jweakref is not supported in this configuration", decl);
5342 if (!targetm.have_tls
5343 && TREE_CODE (decl) == VAR_DECL
5344 && DECL_THREAD_LOCAL_P (decl))
5346 decl = emutls_decl (decl);
5347 target = get_emutls_object_name (target);
5350 #ifdef ASM_OUTPUT_DEF
5351 /* Make name accessible from other files, if appropriate. */
5353 if (TREE_PUBLIC (decl))
5355 globalize_decl (decl);
5356 maybe_assemble_visibility (decl);
5359 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5360 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file, decl, target);
5362 ASM_OUTPUT_DEF (asm_out_file,
5363 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
5364 IDENTIFIER_POINTER (target));
5366 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5371 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5372 # ifdef ASM_WEAKEN_DECL
5373 ASM_WEAKEN_DECL (asm_out_file, decl, name, IDENTIFIER_POINTER (target));
5375 ASM_OUTPUT_WEAK_ALIAS (asm_out_file, name, IDENTIFIER_POINTER (target));
5377 /* Remove this function from the pending weak list so that
5378 we do not emit multiple .weak directives for it. */
5379 for (p = &weak_decls; (t = *p) ; )
5380 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
5381 *p = TREE_CHAIN (t);
5383 p = &TREE_CHAIN (t);
5385 /* Remove weakrefs to the same target from the pending weakref
5386 list, for the same reason. */
5387 for (p = &weakref_targets; (t = *p) ; )
5389 if (DECL_ASSEMBLER_NAME (decl)
5390 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
5391 *p = TREE_CHAIN (t);
5393 p = &TREE_CHAIN (t);
5399 /* First pass of completing pending aliases. Make sure that cgraph knows
5400 which symbols will be required. */
5403 finish_aliases_1 (void)
5408 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); i++)
5412 target_decl = find_decl_and_mark_needed (p->decl, p->target);
5413 if (target_decl == NULL)
5415 if (! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
5416 error ("%q+D aliased to undefined symbol %qs",
5417 p->decl, IDENTIFIER_POINTER (p->target));
5419 else if (DECL_EXTERNAL (target_decl)
5420 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
5421 error ("%q+D aliased to external symbol %qs",
5422 p->decl, IDENTIFIER_POINTER (p->target));
5426 /* Second pass of completing pending aliases. Emit the actual assembly.
5427 This happens at the end of compilation and thus it is assured that the
5428 target symbol has been emitted. */
5431 finish_aliases_2 (void)
5436 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); i++)
5437 do_assemble_alias (p->decl, p->target);
5439 VEC_truncate (alias_pair, alias_pairs, 0);
5442 /* Emit an assembler directive to make the symbol for DECL an alias to
5443 the symbol for TARGET. */
5446 assemble_alias (tree decl, tree target)
5449 bool is_weakref = false;
5451 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
5453 tree alias = DECL_ASSEMBLER_NAME (decl);
5457 ultimate_transparent_alias_target (&target);
5459 if (alias == target)
5460 error ("weakref %q+D ultimately targets itself", decl);
5463 #ifndef ASM_OUTPUT_WEAKREF
5464 IDENTIFIER_TRANSPARENT_ALIAS (alias) = 1;
5465 TREE_CHAIN (alias) = target;
5468 if (TREE_PUBLIC (decl))
5469 error ("weakref %q+D must have static linkage", decl);
5473 #if !defined (ASM_OUTPUT_DEF)
5474 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5475 error ("%Jalias definitions not supported in this configuration", decl);
5478 if (!DECL_WEAK (decl))
5480 error ("%Jonly weak aliases are supported in this configuration", decl);
5487 /* We must force creation of DECL_RTL for debug info generation, even though
5488 we don't use it here. */
5489 make_decl_rtl (decl);
5490 TREE_USED (decl) = 1;
5492 /* A quirk of the initial implementation of aliases required that the user
5493 add "extern" to all of them. Which is silly, but now historical. Do
5494 note that the symbol is in fact locally defined. */
5496 DECL_EXTERNAL (decl) = 0;
5498 /* Allow aliases to aliases. */
5499 if (TREE_CODE (decl) == FUNCTION_DECL)
5500 cgraph_node (decl)->alias = true;
5502 varpool_node (decl)->alias = true;
5504 /* If the target has already been emitted, we don't have to queue the
5505 alias. This saves a tad of memory. */
5506 if (cgraph_global_info_ready)
5507 target_decl = find_decl_and_mark_needed (decl, target);
5510 if (target_decl && TREE_ASM_WRITTEN (target_decl))
5511 do_assemble_alias (decl, target);
5514 alias_pair *p = VEC_safe_push (alias_pair, gc, alias_pairs, NULL);
5520 /* Emit an assembler directive to set symbol for DECL visibility to
5521 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5524 default_assemble_visibility (tree decl, int vis)
5526 static const char * const visibility_types[] = {
5527 NULL, "protected", "hidden", "internal"
5530 const char *name, *type;
5532 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5533 type = visibility_types[vis];
5535 #ifdef HAVE_GAS_HIDDEN
5536 fprintf (asm_out_file, "\t.%s\t", type);
5537 assemble_name (asm_out_file, name);
5538 fprintf (asm_out_file, "\n");
5540 warning (OPT_Wattributes, "visibility attribute not supported "
5541 "in this configuration; ignored");
5545 /* A helper function to call assemble_visibility when needed for a decl. */
5548 maybe_assemble_visibility (tree decl)
5550 enum symbol_visibility vis = DECL_VISIBILITY (decl);
5552 if (vis != VISIBILITY_DEFAULT)
5554 targetm.asm_out.visibility (decl, vis);
5561 /* Returns 1 if the target configuration supports defining public symbols
5562 so that one of them will be chosen at link time instead of generating a
5563 multiply-defined symbol error, whether through the use of weak symbols or
5564 a target-specific mechanism for having duplicates discarded. */
5567 supports_one_only (void)
5569 if (SUPPORTS_ONE_ONLY)
5571 return SUPPORTS_WEAK;
5574 /* Set up DECL as a public symbol that can be defined in multiple
5575 translation units without generating a linker error. */
5578 make_decl_one_only (tree decl)
5580 gcc_assert (TREE_CODE (decl) == VAR_DECL
5581 || TREE_CODE (decl) == FUNCTION_DECL);
5583 TREE_PUBLIC (decl) = 1;
5585 if (SUPPORTS_ONE_ONLY)
5587 #ifdef MAKE_DECL_ONE_ONLY
5588 MAKE_DECL_ONE_ONLY (decl);
5590 DECL_ONE_ONLY (decl) = 1;
5592 else if (TREE_CODE (decl) == VAR_DECL
5593 && (DECL_INITIAL (decl) == 0 || DECL_INITIAL (decl) == error_mark_node))
5594 DECL_COMMON (decl) = 1;
5597 gcc_assert (SUPPORTS_WEAK);
5598 DECL_WEAK (decl) = 1;
5603 init_varasm_once (void)
5605 section_htab = htab_create_ggc (31, section_entry_hash,
5606 section_entry_eq, NULL);
5607 object_block_htab = htab_create_ggc (31, object_block_entry_hash,
5608 object_block_entry_eq, NULL);
5609 const_desc_htab = htab_create_ggc (1009, const_desc_hash,
5610 const_desc_eq, NULL);
5612 const_alias_set = new_alias_set ();
5613 shared_constant_pool = create_constant_pool ();
5615 #ifdef TEXT_SECTION_ASM_OP
5616 text_section = get_unnamed_section (SECTION_CODE, output_section_asm_op,
5617 TEXT_SECTION_ASM_OP);
5620 #ifdef DATA_SECTION_ASM_OP
5621 data_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
5622 DATA_SECTION_ASM_OP);
5625 #ifdef SDATA_SECTION_ASM_OP
5626 sdata_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
5627 SDATA_SECTION_ASM_OP);
5630 #ifdef READONLY_DATA_SECTION_ASM_OP
5631 readonly_data_section = get_unnamed_section (0, output_section_asm_op,
5632 READONLY_DATA_SECTION_ASM_OP);
5635 #ifdef CTORS_SECTION_ASM_OP
5636 ctors_section = get_unnamed_section (0, output_section_asm_op,
5637 CTORS_SECTION_ASM_OP);
5640 #ifdef DTORS_SECTION_ASM_OP
5641 dtors_section = get_unnamed_section (0, output_section_asm_op,
5642 DTORS_SECTION_ASM_OP);
5645 #ifdef BSS_SECTION_ASM_OP
5646 bss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
5647 output_section_asm_op,
5648 BSS_SECTION_ASM_OP);
5651 #ifdef SBSS_SECTION_ASM_OP
5652 sbss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
5653 output_section_asm_op,
5654 SBSS_SECTION_ASM_OP);
5657 tls_comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5658 | SECTION_COMMON, emit_tls_common);
5659 lcomm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5660 | SECTION_COMMON, emit_local);
5661 comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5662 | SECTION_COMMON, emit_common);
5664 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
5665 bss_noswitch_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS,
5669 targetm.asm_out.init_sections ();
5671 if (readonly_data_section == NULL)
5672 readonly_data_section = text_section;
5676 decl_default_tls_model (const_tree decl)
5678 enum tls_model kind;
5681 is_local = targetm.binds_local_p (decl);
5685 kind = TLS_MODEL_LOCAL_EXEC;
5687 kind = TLS_MODEL_INITIAL_EXEC;
5690 /* Local dynamic is inefficient when we're not combining the
5691 parts of the address. */
5692 else if (optimize && is_local)
5693 kind = TLS_MODEL_LOCAL_DYNAMIC;
5695 kind = TLS_MODEL_GLOBAL_DYNAMIC;
5696 if (kind < flag_tls_default)
5697 kind = flag_tls_default;
5702 /* Select a set of attributes for section NAME based on the properties
5703 of DECL and whether or not RELOC indicates that DECL's initializer
5704 might contain runtime relocations.
5706 We make the section read-only and executable for a function decl,
5707 read-only for a const data decl, and writable for a non-const data decl. */
5710 default_section_type_flags (tree decl, const char *name, int reloc)
5714 if (decl && TREE_CODE (decl) == FUNCTION_DECL)
5715 flags = SECTION_CODE;
5716 else if (decl && decl_readonly_section (decl, reloc))
5718 else if (current_function_decl
5720 && crtl->subsections.unlikely_text_section_name
5721 && strcmp (name, crtl->subsections.unlikely_text_section_name) == 0)
5722 flags = SECTION_CODE;
5724 && (!current_function_decl || !cfun)
5725 && strcmp (name, UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
5726 flags = SECTION_CODE;
5728 flags = SECTION_WRITE;
5730 if (decl && DECL_ONE_ONLY (decl))
5731 flags |= SECTION_LINKONCE;
5733 if (decl && TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
5734 flags |= SECTION_TLS | SECTION_WRITE;
5736 if (strcmp (name, ".bss") == 0
5737 || strncmp (name, ".bss.", 5) == 0
5738 || strncmp (name, ".gnu.linkonce.b.", 16) == 0
5739 || strcmp (name, ".sbss") == 0
5740 || strncmp (name, ".sbss.", 6) == 0
5741 || strncmp (name, ".gnu.linkonce.sb.", 17) == 0)
5742 flags |= SECTION_BSS;
5744 if (strcmp (name, ".tdata") == 0
5745 || strncmp (name, ".tdata.", 7) == 0
5746 || strncmp (name, ".gnu.linkonce.td.", 17) == 0)
5747 flags |= SECTION_TLS;
5749 if (strcmp (name, ".tbss") == 0
5750 || strncmp (name, ".tbss.", 6) == 0
5751 || strncmp (name, ".gnu.linkonce.tb.", 17) == 0)
5752 flags |= SECTION_TLS | SECTION_BSS;
5754 /* These three sections have special ELF types. They are neither
5755 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
5756 want to print a section type (@progbits or @nobits). If someone
5757 is silly enough to emit code or TLS variables to one of these
5758 sections, then don't handle them specially. */
5759 if (!(flags & (SECTION_CODE | SECTION_BSS | SECTION_TLS))
5760 && (strcmp (name, ".init_array") == 0
5761 || strcmp (name, ".fini_array") == 0
5762 || strcmp (name, ".preinit_array") == 0))
5763 flags |= SECTION_NOTYPE;
5768 /* Return true if the target supports some form of global BSS,
5769 either through bss_noswitch_section, or by selecting a BSS
5770 section in TARGET_ASM_SELECT_SECTION. */
5773 have_global_bss_p (void)
5775 return bss_noswitch_section || targetm.have_switchable_bss_sections;
5778 /* Output assembly to switch to section NAME with attribute FLAGS.
5779 Four variants for common object file formats. */
5782 default_no_named_section (const char *name ATTRIBUTE_UNUSED,
5783 unsigned int flags ATTRIBUTE_UNUSED,
5784 tree decl ATTRIBUTE_UNUSED)
5786 /* Some object formats don't support named sections at all. The
5787 front-end should already have flagged this as an error. */
5792 default_elf_asm_named_section (const char *name, unsigned int flags,
5793 tree decl ATTRIBUTE_UNUSED)
5795 char flagchars[10], *f = flagchars;
5797 /* If we have already declared this section, we can use an
5798 abbreviated form to switch back to it -- unless this section is
5799 part of a COMDAT groups, in which case GAS requires the full
5800 declaration every time. */
5801 if (!(HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5802 && (flags & SECTION_DECLARED))
5804 fprintf (asm_out_file, "\t.section\t%s\n", name);
5808 if (!(flags & SECTION_DEBUG))
5810 if (flags & SECTION_WRITE)
5812 if (flags & SECTION_CODE)
5814 if (flags & SECTION_SMALL)
5816 if (flags & SECTION_MERGE)
5818 if (flags & SECTION_STRINGS)
5820 if (flags & SECTION_TLS)
5822 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5826 fprintf (asm_out_file, "\t.section\t%s,\"%s\"", name, flagchars);
5828 if (!(flags & SECTION_NOTYPE))
5833 if (flags & SECTION_BSS)
5839 #ifdef ASM_COMMENT_START
5840 /* On platforms that use "@" as the assembly comment character,
5842 if (strcmp (ASM_COMMENT_START, "@") == 0)
5845 fprintf (asm_out_file, format, type);
5847 if (flags & SECTION_ENTSIZE)
5848 fprintf (asm_out_file, ",%d", flags & SECTION_ENTSIZE);
5849 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5850 fprintf (asm_out_file, ",%s,comdat",
5851 lang_hooks.decls.comdat_group (decl));
5854 putc ('\n', asm_out_file);
5858 default_coff_asm_named_section (const char *name, unsigned int flags,
5859 tree decl ATTRIBUTE_UNUSED)
5861 char flagchars[8], *f = flagchars;
5863 if (flags & SECTION_WRITE)
5865 if (flags & SECTION_CODE)
5869 fprintf (asm_out_file, "\t.section\t%s,\"%s\"\n", name, flagchars);
5873 default_pe_asm_named_section (const char *name, unsigned int flags,
5876 default_coff_asm_named_section (name, flags, decl);
5878 if (flags & SECTION_LINKONCE)
5880 /* Functions may have been compiled at various levels of
5881 optimization so we can't use `same_size' here.
5882 Instead, have the linker pick one. */
5883 fprintf (asm_out_file, "\t.linkonce %s\n",
5884 (flags & SECTION_CODE ? "discard" : "same_size"));
5888 /* The lame default section selector. */
5891 default_select_section (tree decl, int reloc,
5892 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
5896 if (decl_readonly_section (decl, reloc))
5897 return readonly_data_section;
5899 else if (TREE_CODE (decl) == CONSTRUCTOR)
5901 if (! ((flag_pic && reloc)
5902 || !TREE_READONLY (decl)
5903 || TREE_SIDE_EFFECTS (decl)
5904 || !TREE_CONSTANT (decl)))
5905 return readonly_data_section;
5907 else if (TREE_CODE (decl) == STRING_CST)
5908 return readonly_data_section;
5909 else if (! (flag_pic && reloc))
5910 return readonly_data_section;
5912 return data_section;
5915 enum section_category
5916 categorize_decl_for_section (const_tree decl, int reloc)
5918 enum section_category ret;
5920 if (TREE_CODE (decl) == FUNCTION_DECL)
5922 else if (TREE_CODE (decl) == STRING_CST)
5924 if (flag_mudflap) /* or !flag_merge_constants */
5925 return SECCAT_RODATA;
5927 return SECCAT_RODATA_MERGE_STR;
5929 else if (TREE_CODE (decl) == VAR_DECL)
5931 if (bss_initializer_p (decl))
5933 else if (! TREE_READONLY (decl)
5934 || TREE_SIDE_EFFECTS (decl)
5935 || ! TREE_CONSTANT (DECL_INITIAL (decl)))
5937 /* Here the reloc_rw_mask is not testing whether the section should
5938 be read-only or not, but whether the dynamic link will have to
5939 do something. If so, we wish to segregate the data in order to
5940 minimize cache misses inside the dynamic linker. */
5941 if (reloc & targetm.asm_out.reloc_rw_mask ())
5942 ret = reloc == 1 ? SECCAT_DATA_REL_LOCAL : SECCAT_DATA_REL;
5946 else if (reloc & targetm.asm_out.reloc_rw_mask ())
5947 ret = reloc == 1 ? SECCAT_DATA_REL_RO_LOCAL : SECCAT_DATA_REL_RO;
5948 else if (reloc || flag_merge_constants < 2)
5949 /* C and C++ don't allow different variables to share the same
5950 location. -fmerge-all-constants allows even that (at the
5951 expense of not conforming). */
5952 ret = SECCAT_RODATA;
5953 else if (TREE_CODE (DECL_INITIAL (decl)) == STRING_CST)
5954 ret = SECCAT_RODATA_MERGE_STR_INIT;
5956 ret = SECCAT_RODATA_MERGE_CONST;
5958 else if (TREE_CODE (decl) == CONSTRUCTOR)
5960 if ((reloc & targetm.asm_out.reloc_rw_mask ())
5961 || TREE_SIDE_EFFECTS (decl)
5962 || ! TREE_CONSTANT (decl))
5965 ret = SECCAT_RODATA;
5968 ret = SECCAT_RODATA;
5970 /* There are no read-only thread-local sections. */
5971 if (TREE_CODE (decl) == VAR_DECL && DECL_TLS_MODEL (decl))
5973 if (DECL_TLS_MODEL (decl) == TLS_MODEL_EMULATED)
5975 if (DECL_EMUTLS_VAR_P (decl))
5977 if (targetm.emutls.var_section)
5978 ret = SECCAT_EMUTLS_VAR;
5982 if (targetm.emutls.tmpl_prefix)
5983 ret = SECCAT_EMUTLS_TMPL;
5986 /* Note that this would be *just* SECCAT_BSS, except that there's
5987 no concept of a read-only thread-local-data section. */
5988 else if (ret == SECCAT_BSS
5989 || (flag_zero_initialized_in_bss
5990 && initializer_zerop (DECL_INITIAL (decl))))
5996 /* If the target uses small data sections, select it. */
5997 else if (targetm.in_small_data_p (decl))
5999 if (ret == SECCAT_BSS)
6001 else if (targetm.have_srodata_section && ret == SECCAT_RODATA)
6002 ret = SECCAT_SRODATA;
6011 decl_readonly_section (const_tree decl, int reloc)
6013 switch (categorize_decl_for_section (decl, reloc))
6016 case SECCAT_RODATA_MERGE_STR:
6017 case SECCAT_RODATA_MERGE_STR_INIT:
6018 case SECCAT_RODATA_MERGE_CONST:
6019 case SECCAT_SRODATA:
6028 /* Select a section based on the above categorization. */
6031 default_elf_select_section (tree decl, int reloc,
6032 unsigned HOST_WIDE_INT align)
6035 switch (categorize_decl_for_section (decl, reloc))
6038 /* We're not supposed to be called on FUNCTION_DECLs. */
6041 return readonly_data_section;
6042 case SECCAT_RODATA_MERGE_STR:
6043 return mergeable_string_section (decl, align, 0);
6044 case SECCAT_RODATA_MERGE_STR_INIT:
6045 return mergeable_string_section (DECL_INITIAL (decl), align, 0);
6046 case SECCAT_RODATA_MERGE_CONST:
6047 return mergeable_constant_section (DECL_MODE (decl), align, 0);
6048 case SECCAT_SRODATA:
6052 return data_section;
6053 case SECCAT_DATA_REL:
6054 sname = ".data.rel";
6056 case SECCAT_DATA_REL_LOCAL:
6057 sname = ".data.rel.local";
6059 case SECCAT_DATA_REL_RO:
6060 sname = ".data.rel.ro";
6062 case SECCAT_DATA_REL_RO_LOCAL:
6063 sname = ".data.rel.ro.local";
6082 case SECCAT_EMUTLS_VAR:
6083 sname = targetm.emutls.var_section;
6085 case SECCAT_EMUTLS_TMPL:
6086 sname = targetm.emutls.tmpl_section;
6094 return get_named_section (decl, sname, reloc);
6097 /* Construct a unique section name based on the decl name and the
6098 categorization performed above. */
6101 default_unique_section (tree decl, int reloc)
6103 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6104 bool one_only = DECL_ONE_ONLY (decl) && !HAVE_COMDAT_GROUP;
6105 const char *prefix, *name, *linkonce;
6108 switch (categorize_decl_for_section (decl, reloc))
6111 prefix = one_only ? ".t" : ".text";
6114 case SECCAT_RODATA_MERGE_STR:
6115 case SECCAT_RODATA_MERGE_STR_INIT:
6116 case SECCAT_RODATA_MERGE_CONST:
6117 prefix = one_only ? ".r" : ".rodata";
6119 case SECCAT_SRODATA:
6120 prefix = one_only ? ".s2" : ".sdata2";
6123 prefix = one_only ? ".d" : ".data";
6125 case SECCAT_DATA_REL:
6126 prefix = one_only ? ".d.rel" : ".data.rel";
6128 case SECCAT_DATA_REL_LOCAL:
6129 prefix = one_only ? ".d.rel.local" : ".data.rel.local";
6131 case SECCAT_DATA_REL_RO:
6132 prefix = one_only ? ".d.rel.ro" : ".data.rel.ro";
6134 case SECCAT_DATA_REL_RO_LOCAL:
6135 prefix = one_only ? ".d.rel.ro.local" : ".data.rel.ro.local";
6138 prefix = one_only ? ".s" : ".sdata";
6141 prefix = one_only ? ".b" : ".bss";
6144 prefix = one_only ? ".sb" : ".sbss";
6147 prefix = one_only ? ".td" : ".tdata";
6150 prefix = one_only ? ".tb" : ".tbss";
6152 case SECCAT_EMUTLS_VAR:
6153 prefix = targetm.emutls.var_section;
6155 case SECCAT_EMUTLS_TMPL:
6156 prefix = targetm.emutls.tmpl_section;
6162 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
6163 name = targetm.strip_name_encoding (name);
6165 /* If we're using one_only, then there needs to be a .gnu.linkonce
6166 prefix to the section name. */
6167 linkonce = one_only ? ".gnu.linkonce" : "";
6169 string = ACONCAT ((linkonce, prefix, ".", name, NULL));
6171 DECL_SECTION_NAME (decl) = build_string (strlen (string), string);
6174 /* Like compute_reloc_for_constant, except for an RTX. The return value
6175 is a mask for which bit 1 indicates a global relocation, and bit 0
6176 indicates a local relocation. */
6179 compute_reloc_for_rtx_1 (rtx *xp, void *data)
6181 int *preloc = (int *) data;
6184 switch (GET_CODE (x))
6187 *preloc |= SYMBOL_REF_LOCAL_P (x) ? 1 : 2;
6200 compute_reloc_for_rtx (rtx x)
6204 switch (GET_CODE (x))
6210 for_each_rtx (&x, compute_reloc_for_rtx_1, &reloc);
6219 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED,
6221 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
6223 if (compute_reloc_for_rtx (x) & targetm.asm_out.reloc_rw_mask ())
6224 return data_section;
6226 return readonly_data_section;
6230 default_elf_select_rtx_section (enum machine_mode mode, rtx x,
6231 unsigned HOST_WIDE_INT align)
6233 int reloc = compute_reloc_for_rtx (x);
6235 /* ??? Handle small data here somehow. */
6237 if (reloc & targetm.asm_out.reloc_rw_mask ())
6240 return get_named_section (NULL, ".data.rel.ro.local", 1);
6242 return get_named_section (NULL, ".data.rel.ro", 3);
6245 return mergeable_constant_section (mode, align, 0);
6248 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6251 default_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
6256 /* Careful not to prod global register variables. */
6259 symbol = XEXP (rtl, 0);
6260 if (GET_CODE (symbol) != SYMBOL_REF)
6263 flags = SYMBOL_REF_FLAGS (symbol) & SYMBOL_FLAG_HAS_BLOCK_INFO;
6264 if (TREE_CODE (decl) == FUNCTION_DECL)
6265 flags |= SYMBOL_FLAG_FUNCTION;
6266 if (targetm.binds_local_p (decl))
6267 flags |= SYMBOL_FLAG_LOCAL;
6268 if (targetm.have_tls && TREE_CODE (decl) == VAR_DECL
6269 && DECL_THREAD_LOCAL_P (decl))
6270 flags |= DECL_TLS_MODEL (decl) << SYMBOL_FLAG_TLS_SHIFT;
6271 else if (targetm.in_small_data_p (decl))
6272 flags |= SYMBOL_FLAG_SMALL;
6273 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6274 being PUBLIC, the thing *must* be defined in this translation unit.
6275 Prevent this buglet from being propagated into rtl code as well. */
6276 if (DECL_P (decl) && DECL_EXTERNAL (decl) && TREE_PUBLIC (decl))
6277 flags |= SYMBOL_FLAG_EXTERNAL;
6279 SYMBOL_REF_FLAGS (symbol) = flags;
6282 /* By default, we do nothing for encode_section_info, so we need not
6283 do anything but discard the '*' marker. */
6286 default_strip_name_encoding (const char *str)
6288 return str + (*str == '*');
6291 #ifdef ASM_OUTPUT_DEF
6292 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6293 anchor relative to ".", the current section position. */
6296 default_asm_output_anchor (rtx symbol)
6300 sprintf (buffer, "*. + " HOST_WIDE_INT_PRINT_DEC,
6301 SYMBOL_REF_BLOCK_OFFSET (symbol));
6302 ASM_OUTPUT_DEF (asm_out_file, XSTR (symbol, 0), buffer);
6306 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6309 default_use_anchors_for_symbol_p (const_rtx symbol)
6314 /* Don't use anchors for mergeable sections. The linker might move
6315 the objects around. */
6316 sect = SYMBOL_REF_BLOCK (symbol)->sect;
6317 if (sect->common.flags & SECTION_MERGE)
6320 /* Don't use anchors for small data sections. The small data register
6321 acts as an anchor for such sections. */
6322 if (sect->common.flags & SECTION_SMALL)
6325 decl = SYMBOL_REF_DECL (symbol);
6326 if (decl && DECL_P (decl))
6328 /* Don't use section anchors for decls that might be defined by
6330 if (!targetm.binds_local_p (decl))
6333 /* Don't use section anchors for decls that will be placed in a
6334 small data section. */
6335 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6336 one above. The problem is that we only use SECTION_SMALL for
6337 sections that should be marked as small in the section directive. */
6338 if (targetm.in_small_data_p (decl))
6344 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6345 wrt cross-module name binding. */
6348 default_binds_local_p (const_tree exp)
6350 return default_binds_local_p_1 (exp, flag_shlib);
6354 default_binds_local_p_1 (const_tree exp, int shlib)
6358 /* A non-decl is an entry in the constant pool. */
6361 /* Weakrefs may not bind locally, even though the weakref itself is
6362 always static and therefore local. */
6363 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp)))
6365 /* Static variables are always local. */
6366 else if (! TREE_PUBLIC (exp))
6368 /* A variable is local if the user has said explicitly that it will
6370 else if (DECL_VISIBILITY_SPECIFIED (exp)
6371 && DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
6373 /* Variables defined outside this object might not be local. */
6374 else if (DECL_EXTERNAL (exp))
6376 /* If defined in this object and visibility is not default, must be
6378 else if (DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
6380 /* Default visibility weak data can be overridden by a strong symbol
6381 in another module and so are not local. */
6382 else if (DECL_WEAK (exp))
6384 /* If PIC, then assume that any global name can be overridden by
6385 symbols resolved from other modules, unless we are compiling with
6386 -fwhole-program, which assumes that names are local. */
6388 local_p = flag_whole_program;
6389 /* Uninitialized COMMON variable may be unified with symbols
6390 resolved from other modules. */
6391 else if (DECL_COMMON (exp)
6392 && (DECL_INITIAL (exp) == NULL
6393 || DECL_INITIAL (exp) == error_mark_node))
6395 /* Otherwise we're left with initialized (or non-common) global data
6396 which is of necessity defined locally. */
6403 /* Determine whether or not a pointer mode is valid. Assume defaults
6404 of ptr_mode or Pmode - can be overridden. */
6406 default_valid_pointer_mode (enum machine_mode mode)
6408 return (mode == ptr_mode || mode == Pmode);
6411 /* Default function to output code that will globalize a label. A
6412 target must define GLOBAL_ASM_OP or provide its own function to
6413 globalize a label. */
6414 #ifdef GLOBAL_ASM_OP
6416 default_globalize_label (FILE * stream, const char *name)
6418 fputs (GLOBAL_ASM_OP, stream);
6419 assemble_name (stream, name);
6420 putc ('\n', stream);
6422 #endif /* GLOBAL_ASM_OP */
6424 /* Default function to output code that will globalize a declaration. */
6426 default_globalize_decl_name (FILE * stream, tree decl)
6428 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
6429 targetm.asm_out.globalize_label (stream, name);
6432 /* Default function to output a label for unwind information. The
6433 default is to do nothing. A target that needs nonlocal labels for
6434 unwind information must provide its own function to do this. */
6436 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED,
6437 tree decl ATTRIBUTE_UNUSED,
6438 int for_eh ATTRIBUTE_UNUSED,
6439 int empty ATTRIBUTE_UNUSED)
6443 /* Default function to output a label to divide up the exception table.
6444 The default is to do nothing. A target that needs/wants to divide
6445 up the table must provide it's own function to do this. */
6447 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED)
6451 /* This is how to output an internal numbered label where PREFIX is
6452 the class of label and LABELNO is the number within the class. */
6455 default_internal_label (FILE *stream, const char *prefix,
6456 unsigned long labelno)
6458 char *const buf = (char *) alloca (40 + strlen (prefix));
6459 ASM_GENERATE_INTERNAL_LABEL (buf, prefix, labelno);
6460 ASM_OUTPUT_INTERNAL_LABEL (stream, buf);
6463 /* This is the default behavior at the beginning of a file. It's
6464 controlled by two other target-hook toggles. */
6466 default_file_start (void)
6468 if (targetm.file_start_app_off
6469 && !(flag_verbose_asm || flag_debug_asm || flag_dump_rtl_in_asm))
6470 fputs (ASM_APP_OFF, asm_out_file);
6472 if (targetm.file_start_file_directive)
6473 output_file_directive (asm_out_file, main_input_filename);
6476 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6477 which emits a special section directive used to indicate whether or
6478 not this object file needs an executable stack. This is primarily
6479 a GNU extension to ELF but could be used on other targets. */
6481 int trampolines_created;
6484 file_end_indicate_exec_stack (void)
6486 unsigned int flags = SECTION_DEBUG;
6487 if (trampolines_created)
6488 flags |= SECTION_CODE;
6490 switch_to_section (get_section (".note.GNU-stack", flags, NULL));
6493 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6494 a get_unnamed_section callback. */
6497 output_section_asm_op (const void *directive)
6499 fprintf (asm_out_file, "%s\n", (const char *) directive);
6502 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6503 the current section is NEW_SECTION. */
6506 switch_to_section (section *new_section)
6508 if (in_section == new_section)
6511 if (new_section->common.flags & SECTION_FORGET)
6514 in_section = new_section;
6516 switch (SECTION_STYLE (new_section))
6520 && !crtl->subsections.unlikely_text_section_name
6521 && strcmp (new_section->named.name,
6522 UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
6523 crtl->subsections.unlikely_text_section_name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
6525 targetm.asm_out.named_section (new_section->named.name,
6526 new_section->named.common.flags,
6527 new_section->named.decl);
6530 case SECTION_UNNAMED:
6531 new_section->unnamed.callback (new_section->unnamed.data);
6534 case SECTION_NOSWITCH:
6539 new_section->common.flags |= SECTION_DECLARED;
6542 /* If block symbol SYMBOL has not yet been assigned an offset, place
6543 it at the end of its block. */
6546 place_block_symbol (rtx symbol)
6548 unsigned HOST_WIDE_INT size, mask, offset;
6549 struct constant_descriptor_rtx *desc;
6550 unsigned int alignment;
6551 struct object_block *block;
6554 gcc_assert (SYMBOL_REF_BLOCK (symbol));
6555 if (SYMBOL_REF_BLOCK_OFFSET (symbol) >= 0)
6558 /* Work out the symbol's size and alignment. */
6559 if (CONSTANT_POOL_ADDRESS_P (symbol))
6561 desc = SYMBOL_REF_CONSTANT (symbol);
6562 alignment = desc->align;
6563 size = GET_MODE_SIZE (desc->mode);
6565 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
6567 decl = SYMBOL_REF_DECL (symbol);
6568 alignment = get_constant_alignment (decl);
6569 size = get_constant_size (decl);
6573 decl = SYMBOL_REF_DECL (symbol);
6574 alignment = DECL_ALIGN (decl);
6575 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
6578 /* Calculate the object's offset from the start of the block. */
6579 block = SYMBOL_REF_BLOCK (symbol);
6580 mask = alignment / BITS_PER_UNIT - 1;
6581 offset = (block->size + mask) & ~mask;
6582 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
6584 /* Record the block's new alignment and size. */
6585 block->alignment = MAX (block->alignment, alignment);
6586 block->size = offset + size;
6588 VEC_safe_push (rtx, gc, block->objects, symbol);
6591 /* Return the anchor that should be used to address byte offset OFFSET
6592 from the first object in BLOCK. MODEL is the TLS model used
6596 get_section_anchor (struct object_block *block, HOST_WIDE_INT offset,
6597 enum tls_model model)
6600 unsigned int begin, middle, end;
6601 unsigned HOST_WIDE_INT min_offset, max_offset, range, bias, delta;
6604 /* Work out the anchor's offset. Use an offset of 0 for the first
6605 anchor so that we don't pessimize the case where we take the address
6606 of a variable at the beginning of the block. This is particularly
6607 useful when a block has only one variable assigned to it.
6609 We try to place anchors RANGE bytes apart, so there can then be
6610 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
6611 a ptr_mode offset. With some target settings, the lowest such
6612 anchor might be out of range for the lowest ptr_mode offset;
6613 likewise the highest anchor for the highest offset. Use anchors
6614 at the extreme ends of the ptr_mode range in such cases.
6616 All arithmetic uses unsigned integers in order to avoid
6618 max_offset = (unsigned HOST_WIDE_INT) targetm.max_anchor_offset;
6619 min_offset = (unsigned HOST_WIDE_INT) targetm.min_anchor_offset;
6620 range = max_offset - min_offset + 1;
6625 bias = 1 << (GET_MODE_BITSIZE (ptr_mode) - 1);
6628 delta = -(unsigned HOST_WIDE_INT) offset + max_offset;
6629 delta -= delta % range;
6632 offset = (HOST_WIDE_INT) (-delta);
6636 delta = (unsigned HOST_WIDE_INT) offset - min_offset;
6637 delta -= delta % range;
6638 if (delta > bias - 1)
6640 offset = (HOST_WIDE_INT) delta;
6644 /* Do a binary search to see if there's already an anchor we can use.
6645 Set BEGIN to the new anchor's index if not. */
6647 end = VEC_length (rtx, block->anchors);
6648 while (begin != end)
6650 middle = (end + begin) / 2;
6651 anchor = VEC_index (rtx, block->anchors, middle);
6652 if (SYMBOL_REF_BLOCK_OFFSET (anchor) > offset)
6654 else if (SYMBOL_REF_BLOCK_OFFSET (anchor) < offset)
6656 else if (SYMBOL_REF_TLS_MODEL (anchor) > model)
6658 else if (SYMBOL_REF_TLS_MODEL (anchor) < model)
6664 /* Create a new anchor with a unique label. */
6665 ASM_GENERATE_INTERNAL_LABEL (label, "LANCHOR", anchor_labelno++);
6666 anchor = create_block_symbol (ggc_strdup (label), block, offset);
6667 SYMBOL_REF_FLAGS (anchor) |= SYMBOL_FLAG_LOCAL | SYMBOL_FLAG_ANCHOR;
6668 SYMBOL_REF_FLAGS (anchor) |= model << SYMBOL_FLAG_TLS_SHIFT;
6670 /* Insert it at index BEGIN. */
6671 VEC_safe_insert (rtx, gc, block->anchors, begin, anchor);
6675 /* Output the objects in BLOCK. */
6678 output_object_block (struct object_block *block)
6680 struct constant_descriptor_rtx *desc;
6682 HOST_WIDE_INT offset;
6686 if (block->objects == NULL)
6689 /* Switch to the section and make sure that the first byte is
6690 suitably aligned. */
6691 switch_to_section (block->sect);
6692 assemble_align (block->alignment);
6694 /* Define the values of all anchors relative to the current section
6696 for (i = 0; VEC_iterate (rtx, block->anchors, i, symbol); i++)
6697 targetm.asm_out.output_anchor (symbol);
6699 /* Output the objects themselves. */
6701 for (i = 0; VEC_iterate (rtx, block->objects, i, symbol); i++)
6703 /* Move to the object's offset, padding with zeros if necessary. */
6704 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol) - offset);
6705 offset = SYMBOL_REF_BLOCK_OFFSET (symbol);
6706 if (CONSTANT_POOL_ADDRESS_P (symbol))
6708 desc = SYMBOL_REF_CONSTANT (symbol);
6709 output_constant_pool_1 (desc, 1);
6710 offset += GET_MODE_SIZE (desc->mode);
6712 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
6714 decl = SYMBOL_REF_DECL (symbol);
6715 assemble_constant_contents (decl, XSTR (symbol, 0),
6716 get_constant_alignment (decl));
6717 offset += get_constant_size (decl);
6721 decl = SYMBOL_REF_DECL (symbol);
6722 assemble_variable_contents (decl, XSTR (symbol, 0), false);
6723 offset += tree_low_cst (DECL_SIZE_UNIT (decl), 1);
6728 /* A htab_traverse callback used to call output_object_block for
6729 each member of object_block_htab. */
6732 output_object_block_htab (void **slot, void *data ATTRIBUTE_UNUSED)
6734 output_object_block ((struct object_block *) (*slot));
6738 /* Output the definitions of all object_blocks. */
6741 output_object_blocks (void)
6743 htab_traverse (object_block_htab, output_object_block_htab, NULL);
6746 /* This function provides a possible implementation of the
6747 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
6748 by -frecord-gcc-switches it creates a new mergeable, string section in the
6749 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
6750 contains the switches in ASCII format.
6752 FIXME: This code does not correctly handle double quote characters
6753 that appear inside strings, (it strips them rather than preserving them).
6754 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
6755 characters - instead it treats them as sub-string separators. Since
6756 we want to emit NUL strings terminators into the object file we have to use
6760 elf_record_gcc_switches (print_switch_type type, const char * name)
6762 static char buffer[1024];
6764 /* This variable is used as part of a simplistic heuristic to detect
6765 command line switches which take an argument:
6767 "If a command line option does not start with a dash then
6768 it is an argument for the previous command line option."
6770 This fails in the case of the command line option which is the name
6771 of the file to compile, but otherwise it is pretty reasonable. */
6772 static bool previous_name_held_back = FALSE;
6776 case SWITCH_TYPE_PASSED:
6779 if (previous_name_held_back)
6781 unsigned int len = strlen (buffer);
6783 snprintf (buffer + len, sizeof buffer - len, " %s", name);
6784 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
6785 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
6786 previous_name_held_back = FALSE;
6790 strncpy (buffer, name, sizeof buffer);
6791 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
6792 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
6797 if (previous_name_held_back)
6799 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
6800 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
6803 strncpy (buffer, name, sizeof buffer);
6804 previous_name_held_back = TRUE;
6808 case SWITCH_TYPE_DESCRIPTIVE:
6811 /* Distinguish between invocations where name is NULL. */
6812 static bool started = false;
6816 if (previous_name_held_back)
6818 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
6819 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
6826 sec = get_section (targetm.asm_out.record_gcc_switches_section,
6830 | (SECTION_ENTSIZE & 1),
6832 switch_to_section (sec);
6841 /* The return value is currently ignored by the caller, but must be 0.
6842 For -fverbose-asm the return value would be the number of characters
6843 emitted into the assembler file. */
6847 /* Emit text to declare externally defined symbols. It is needed to
6848 properly support non-default visibility. */
6850 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED,
6852 const char *name ATTRIBUTE_UNUSED)
6854 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
6855 set in order to avoid putting out names that are never really
6857 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
6858 && targetm.binds_local_p (decl))
6859 maybe_assemble_visibility (decl);
6862 #include "gt-varasm.h"