1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997,
3 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
23 /* This file handles generation of all the assembler code
24 *except* the instructions of a function.
25 This includes declarations of variables and their initial values.
27 We also output the assembler code for constants stored in memory
28 and are responsible for combining constants with the same value. */
32 #include "coretypes.h"
39 #include "hard-reg-set.h"
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. */
2312 if (SUPPORTS_WEAK && DECL_WEAK (decl)
2313 /* TREE_STATIC is a weird and abused creature which is not
2314 generally the right test for whether an entity has been
2315 locally emitted, inlined or otherwise not-really-extern, but
2316 for declarations that can be weak, it happens to be
2318 && !TREE_STATIC (decl))
2319 weak_decls = tree_cons (NULL, decl, weak_decls);
2321 #ifdef ASM_OUTPUT_EXTERNAL
2322 pending_assemble_externals = tree_cons (0, decl,
2323 pending_assemble_externals);
2327 /* Similar, for calling a library function FUN. */
2330 assemble_external_libcall (rtx fun)
2332 /* Declare library function name external when first used, if nec. */
2333 if (! SYMBOL_REF_USED (fun))
2335 SYMBOL_REF_USED (fun) = 1;
2336 targetm.asm_out.external_libcall (fun);
2340 /* Assemble a label named NAME. */
2343 assemble_label (const char *name)
2345 ASM_OUTPUT_LABEL (asm_out_file, name);
2348 /* Set the symbol_referenced flag for ID. */
2350 mark_referenced (tree id)
2352 TREE_SYMBOL_REFERENCED (id) = 1;
2355 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2357 mark_decl_referenced (tree decl)
2359 if (TREE_CODE (decl) == FUNCTION_DECL)
2361 /* Extern inline functions don't become needed when referenced.
2362 If we know a method will be emitted in other TU and no new
2363 functions can be marked reachable, just use the external
2365 struct cgraph_node *node = cgraph_node (decl);
2366 if (!DECL_EXTERNAL (decl)
2367 && (!node->local.vtable_method || !cgraph_global_info_ready
2368 || !node->local.finalized))
2369 cgraph_mark_needed_node (node);
2371 else if (TREE_CODE (decl) == VAR_DECL)
2373 struct varpool_node *node = varpool_node (decl);
2374 varpool_mark_needed_node (node);
2375 /* C++ frontend use mark_decl_references to force COMDAT variables
2376 to be output that might appear dead otherwise. */
2377 node->force_output = true;
2379 /* else do nothing - we can get various sorts of CST nodes here,
2380 which do not need to be marked. */
2384 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2385 until we find an identifier that is not itself a transparent alias.
2386 Modify the alias passed to it by reference (and all aliases on the
2387 way to the ultimate target), such that they do not have to be
2388 followed again, and return the ultimate target of the alias
2392 ultimate_transparent_alias_target (tree *alias)
2394 tree target = *alias;
2396 if (IDENTIFIER_TRANSPARENT_ALIAS (target))
2398 gcc_assert (TREE_CHAIN (target));
2399 target = ultimate_transparent_alias_target (&TREE_CHAIN (target));
2400 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target)
2401 && ! TREE_CHAIN (target));
2408 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2409 starts with a *, the rest of NAME is output verbatim. Otherwise
2410 NAME is transformed in a target-specific way (usually by the
2411 addition of an underscore). */
2414 assemble_name_raw (FILE *file, const char *name)
2417 fputs (&name[1], file);
2419 ASM_OUTPUT_LABELREF (file, name);
2422 /* Like assemble_name_raw, but should be used when NAME might refer to
2423 an entity that is also represented as a tree (like a function or
2424 variable). If NAME does refer to such an entity, that entity will
2425 be marked as referenced. */
2428 assemble_name (FILE *file, const char *name)
2430 const char *real_name;
2433 real_name = targetm.strip_name_encoding (name);
2435 id = maybe_get_identifier (real_name);
2440 mark_referenced (id);
2441 ultimate_transparent_alias_target (&id);
2443 name = IDENTIFIER_POINTER (id);
2444 gcc_assert (! TREE_CHAIN (id));
2447 assemble_name_raw (file, name);
2450 /* Allocate SIZE bytes writable static space with a gensym name
2451 and return an RTX to refer to its address. */
2454 assemble_static_space (unsigned HOST_WIDE_INT size)
2457 const char *namestring;
2460 ASM_GENERATE_INTERNAL_LABEL (name, "LF", const_labelno);
2462 namestring = ggc_strdup (name);
2464 x = gen_rtx_SYMBOL_REF (Pmode, namestring);
2465 SYMBOL_REF_FLAGS (x) = SYMBOL_FLAG_LOCAL;
2467 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2468 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, NULL_TREE, name, size,
2471 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2472 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, BIGGEST_ALIGNMENT);
2475 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2476 so that each uninitialized object starts on such a boundary. */
2477 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2478 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2479 = ((size + (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1)
2480 / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
2481 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
2482 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
2489 /* Assemble the static constant template for function entry trampolines.
2490 This is done at most once per compilation.
2491 Returns an RTX for the address of the template. */
2493 static GTY(()) rtx initial_trampoline;
2495 #ifdef TRAMPOLINE_TEMPLATE
2497 assemble_trampoline_template (void)
2504 if (initial_trampoline)
2505 return initial_trampoline;
2507 /* By default, put trampoline templates in read-only data section. */
2509 #ifdef TRAMPOLINE_SECTION
2510 switch_to_section (TRAMPOLINE_SECTION);
2512 switch_to_section (readonly_data_section);
2515 /* Write the assembler code to define one. */
2516 align = floor_log2 (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT);
2519 ASM_OUTPUT_ALIGN (asm_out_file, align);
2522 targetm.asm_out.internal_label (asm_out_file, "LTRAMP", 0);
2523 TRAMPOLINE_TEMPLATE (asm_out_file);
2525 /* Record the rtl to refer to it. */
2526 ASM_GENERATE_INTERNAL_LABEL (label, "LTRAMP", 0);
2527 name = ggc_strdup (label);
2528 symbol = gen_rtx_SYMBOL_REF (Pmode, name);
2529 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_LOCAL;
2531 initial_trampoline = gen_rtx_MEM (BLKmode, symbol);
2532 set_mem_align (initial_trampoline, TRAMPOLINE_ALIGNMENT);
2534 return initial_trampoline;
2538 /* A and B are either alignments or offsets. Return the minimum alignment
2539 that may be assumed after adding the two together. */
2541 static inline unsigned
2542 min_align (unsigned int a, unsigned int b)
2544 return (a | b) & -(a | b);
2547 /* Return the assembler directive for creating a given kind of integer
2548 object. SIZE is the number of bytes in the object and ALIGNED_P
2549 indicates whether it is known to be aligned. Return NULL if the
2550 assembly dialect has no such directive.
2552 The returned string should be printed at the start of a new line and
2553 be followed immediately by the object's initial value. */
2556 integer_asm_op (int size, int aligned_p)
2558 struct asm_int_op *ops;
2561 ops = &targetm.asm_out.aligned_op;
2563 ops = &targetm.asm_out.unaligned_op;
2568 return targetm.asm_out.byte_op;
2582 /* Use directive OP to assemble an integer object X. Print OP at the
2583 start of the line, followed immediately by the value of X. */
2586 assemble_integer_with_op (const char *op, rtx x)
2588 fputs (op, asm_out_file);
2589 output_addr_const (asm_out_file, x);
2590 fputc ('\n', asm_out_file);
2593 /* The default implementation of the asm_out.integer target hook. */
2596 default_assemble_integer (rtx x ATTRIBUTE_UNUSED,
2597 unsigned int size ATTRIBUTE_UNUSED,
2598 int aligned_p ATTRIBUTE_UNUSED)
2600 const char *op = integer_asm_op (size, aligned_p);
2601 /* Avoid GAS bugs for large values. Specifically negative values whose
2602 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2603 if (size > UNITS_PER_WORD && size > POINTER_SIZE / BITS_PER_UNIT)
2605 return op && (assemble_integer_with_op (op, x), true);
2608 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2609 the alignment of the integer in bits. Return 1 if we were able to output
2610 the constant, otherwise 0. We must be able to output the constant,
2611 if FORCE is nonzero. */
2614 assemble_integer (rtx x, unsigned int size, unsigned int align, int force)
2618 aligned_p = (align >= MIN (size * BITS_PER_UNIT, BIGGEST_ALIGNMENT));
2620 /* See if the target hook can handle this kind of object. */
2621 if (targetm.asm_out.integer (x, size, aligned_p))
2624 /* If the object is a multi-byte one, try splitting it up. Split
2625 it into words it if is multi-word, otherwise split it into bytes. */
2628 enum machine_mode omode, imode;
2629 unsigned int subalign;
2630 unsigned int subsize, i;
2631 unsigned char mclass;
2633 subsize = size > UNITS_PER_WORD? UNITS_PER_WORD : 1;
2634 subalign = MIN (align, subsize * BITS_PER_UNIT);
2635 if (GET_CODE (x) == CONST_FIXED)
2636 mclass = GET_MODE_CLASS (GET_MODE (x));
2640 omode = mode_for_size (subsize * BITS_PER_UNIT, mclass, 0);
2641 imode = mode_for_size (size * BITS_PER_UNIT, mclass, 0);
2643 for (i = 0; i < size; i += subsize)
2645 rtx partial = simplify_subreg (omode, x, imode, i);
2646 if (!partial || !assemble_integer (partial, subsize, subalign, 0))
2652 /* If we've printed some of it, but not all of it, there's no going
2657 gcc_assert (!force);
2663 assemble_real (REAL_VALUE_TYPE d, enum machine_mode mode, unsigned int align)
2665 long data[4] = {0, 0, 0, 0};
2667 int bitsize, nelts, nunits, units_per;
2669 /* This is hairy. We have a quantity of known size. real_to_target
2670 will put it into an array of *host* longs, 32 bits per element
2671 (even if long is more than 32 bits). We need to determine the
2672 number of array elements that are occupied (nelts) and the number
2673 of *target* min-addressable units that will be occupied in the
2674 object file (nunits). We cannot assume that 32 divides the
2675 mode's bitsize (size * BITS_PER_UNIT) evenly.
2677 size * BITS_PER_UNIT is used here to make sure that padding bits
2678 (which might appear at either end of the value; real_to_target
2679 will include the padding bits in its output array) are included. */
2681 nunits = GET_MODE_SIZE (mode);
2682 bitsize = nunits * BITS_PER_UNIT;
2683 nelts = CEIL (bitsize, 32);
2684 units_per = 32 / BITS_PER_UNIT;
2686 real_to_target (data, &d, mode);
2688 /* Put out the first word with the specified alignment. */
2689 assemble_integer (GEN_INT (data[0]), MIN (nunits, units_per), align, 1);
2690 nunits -= units_per;
2692 /* Subsequent words need only 32-bit alignment. */
2693 align = min_align (align, 32);
2695 for (i = 1; i < nelts; i++)
2697 assemble_integer (GEN_INT (data[i]), MIN (nunits, units_per), align, 1);
2698 nunits -= units_per;
2702 /* Given an expression EXP with a constant value,
2703 reduce it to the sum of an assembler symbol and an integer.
2704 Store them both in the structure *VALUE.
2705 EXP must be reducible. */
2707 struct addr_const GTY(())
2710 HOST_WIDE_INT offset;
2714 decode_addr_const (tree exp, struct addr_const *value)
2716 tree target = TREE_OPERAND (exp, 0);
2722 if (TREE_CODE (target) == COMPONENT_REF
2723 && host_integerp (byte_position (TREE_OPERAND (target, 1)), 0))
2726 offset += int_byte_position (TREE_OPERAND (target, 1));
2727 target = TREE_OPERAND (target, 0);
2729 else if (TREE_CODE (target) == ARRAY_REF
2730 || TREE_CODE (target) == ARRAY_RANGE_REF)
2732 offset += (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target)), 1)
2733 * tree_low_cst (TREE_OPERAND (target, 1), 0));
2734 target = TREE_OPERAND (target, 0);
2740 switch (TREE_CODE (target))
2744 x = DECL_RTL (target);
2748 x = gen_rtx_MEM (FUNCTION_MODE,
2749 gen_rtx_LABEL_REF (Pmode, force_label_rtx (target)));
2758 x = output_constant_def (target, 1);
2765 gcc_assert (MEM_P (x));
2769 value->offset = offset;
2772 /* Uniquize all constants that appear in memory.
2773 Each constant in memory thus far output is recorded
2774 in `const_desc_table'. */
2776 struct constant_descriptor_tree GTY(())
2778 /* A MEM for the constant. */
2781 /* The value of the constant. */
2784 /* Hash of value. Computing the hash from value each time
2785 hashfn is called can't work properly, as that means recursive
2786 use of the hash table during hash table expansion. */
2790 static GTY((param_is (struct constant_descriptor_tree)))
2791 htab_t const_desc_htab;
2793 static struct constant_descriptor_tree * build_constant_desc (tree);
2794 static void maybe_output_constant_def_contents (struct constant_descriptor_tree *, int);
2796 /* Compute a hash code for a constant expression. */
2799 const_desc_hash (const void *ptr)
2801 return ((const struct constant_descriptor_tree *)ptr)->hash;
2805 const_hash_1 (const tree exp)
2810 enum tree_code code = TREE_CODE (exp);
2812 /* Either set P and LEN to the address and len of something to hash and
2813 exit the switch or return a value. */
2818 p = (char *) &TREE_INT_CST (exp);
2819 len = sizeof TREE_INT_CST (exp);
2823 return real_hash (TREE_REAL_CST_PTR (exp));
2826 return fixed_hash (TREE_FIXED_CST_PTR (exp));
2829 p = TREE_STRING_POINTER (exp);
2830 len = TREE_STRING_LENGTH (exp);
2834 return (const_hash_1 (TREE_REALPART (exp)) * 5
2835 + const_hash_1 (TREE_IMAGPART (exp)));
2839 unsigned HOST_WIDE_INT idx;
2842 hi = 5 + int_size_in_bytes (TREE_TYPE (exp));
2844 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, value)
2846 hi = hi * 603 + const_hash_1 (value);
2854 struct addr_const value;
2856 decode_addr_const (exp, &value);
2857 switch (GET_CODE (value.base))
2860 /* Don't hash the address of the SYMBOL_REF;
2861 only use the offset and the symbol name. */
2863 p = XSTR (value.base, 0);
2864 for (i = 0; p[i] != 0; i++)
2865 hi = ((hi * 613) + (unsigned) (p[i]));
2869 hi = value.offset + CODE_LABEL_NUMBER (XEXP (value.base, 0)) * 13;
2879 case POINTER_PLUS_EXPR:
2881 return (const_hash_1 (TREE_OPERAND (exp, 0)) * 9
2882 + const_hash_1 (TREE_OPERAND (exp, 1)));
2885 return const_hash_1 (TREE_OPERAND (exp, 0)) * 7 + 2;
2888 /* A language specific constant. Just hash the code. */
2892 /* Compute hashing function. */
2894 for (i = 0; i < len; i++)
2895 hi = ((hi * 613) + (unsigned) (p[i]));
2900 /* Wrapper of compare_constant, for the htab interface. */
2902 const_desc_eq (const void *p1, const void *p2)
2904 const struct constant_descriptor_tree *const c1
2905 = (const struct constant_descriptor_tree *) p1;
2906 const struct constant_descriptor_tree *const c2
2907 = (const struct constant_descriptor_tree *) p2;
2908 if (c1->hash != c2->hash)
2910 return compare_constant (c1->value, c2->value);
2913 /* Compare t1 and t2, and return 1 only if they are known to result in
2914 the same bit pattern on output. */
2917 compare_constant (const tree t1, const tree t2)
2919 enum tree_code typecode;
2921 if (t1 == NULL_TREE)
2922 return t2 == NULL_TREE;
2923 if (t2 == NULL_TREE)
2926 if (TREE_CODE (t1) != TREE_CODE (t2))
2929 switch (TREE_CODE (t1))
2932 /* Integer constants are the same only if the same width of type. */
2933 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2935 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2937 return tree_int_cst_equal (t1, t2);
2940 /* Real constants are the same only if the same width of type. */
2941 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2944 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2));
2947 /* Fixed constants are the same only if the same width of type. */
2948 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2951 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1), TREE_FIXED_CST (t2));
2954 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2957 return (TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
2958 && ! memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
2959 TREE_STRING_LENGTH (t1)));
2962 return (compare_constant (TREE_REALPART (t1), TREE_REALPART (t2))
2963 && compare_constant (TREE_IMAGPART (t1), TREE_IMAGPART (t2)));
2967 VEC(constructor_elt, gc) *v1, *v2;
2968 unsigned HOST_WIDE_INT idx;
2970 typecode = TREE_CODE (TREE_TYPE (t1));
2971 if (typecode != TREE_CODE (TREE_TYPE (t2)))
2974 if (typecode == ARRAY_TYPE)
2976 HOST_WIDE_INT size_1 = int_size_in_bytes (TREE_TYPE (t1));
2977 /* For arrays, check that the sizes all match. */
2978 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2))
2980 || size_1 != int_size_in_bytes (TREE_TYPE (t2)))
2985 /* For record and union constructors, require exact type
2987 if (TREE_TYPE (t1) != TREE_TYPE (t2))
2991 v1 = CONSTRUCTOR_ELTS (t1);
2992 v2 = CONSTRUCTOR_ELTS (t2);
2993 if (VEC_length (constructor_elt, v1)
2994 != VEC_length (constructor_elt, v2))
2997 for (idx = 0; idx < VEC_length (constructor_elt, v1); ++idx)
2999 constructor_elt *c1 = VEC_index (constructor_elt, v1, idx);
3000 constructor_elt *c2 = VEC_index (constructor_elt, v2, idx);
3002 /* Check that each value is the same... */
3003 if (!compare_constant (c1->value, c2->value))
3005 /* ... and that they apply to the same fields! */
3006 if (typecode == ARRAY_TYPE)
3008 if (!compare_constant (c1->index, c2->index))
3013 if (c1->index != c2->index)
3024 struct addr_const value1, value2;
3026 decode_addr_const (t1, &value1);
3027 decode_addr_const (t2, &value2);
3028 return (value1.offset == value2.offset
3029 && strcmp (XSTR (value1.base, 0), XSTR (value2.base, 0)) == 0);
3033 case POINTER_PLUS_EXPR:
3036 return (compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0))
3037 && compare_constant(TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1)));
3040 case VIEW_CONVERT_EXPR:
3041 return compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3050 /* Make a copy of the whole tree structure for a constant. This
3051 handles the same types of nodes that compare_constant handles. */
3054 copy_constant (tree exp)
3056 switch (TREE_CODE (exp))
3059 /* For ADDR_EXPR, we do not want to copy the decl whose address
3060 is requested. We do want to copy constants though. */
3061 if (CONSTANT_CLASS_P (TREE_OPERAND (exp, 0)))
3062 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
3063 copy_constant (TREE_OPERAND (exp, 0)));
3065 return copy_node (exp);
3071 return copy_node (exp);
3074 return build_complex (TREE_TYPE (exp),
3075 copy_constant (TREE_REALPART (exp)),
3076 copy_constant (TREE_IMAGPART (exp)));
3079 case POINTER_PLUS_EXPR:
3081 return build2 (TREE_CODE (exp), TREE_TYPE (exp),
3082 copy_constant (TREE_OPERAND (exp, 0)),
3083 copy_constant (TREE_OPERAND (exp, 1)));
3086 case VIEW_CONVERT_EXPR:
3087 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
3088 copy_constant (TREE_OPERAND (exp, 0)));
3092 tree copy = copy_node (exp);
3093 VEC(constructor_elt, gc) *v;
3094 unsigned HOST_WIDE_INT idx;
3095 tree purpose, value;
3097 v = VEC_alloc(constructor_elt, gc, VEC_length(constructor_elt,
3098 CONSTRUCTOR_ELTS (exp)));
3099 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp), idx, purpose, value)
3101 constructor_elt *ce = VEC_quick_push (constructor_elt, v, NULL);
3102 ce->index = purpose;
3103 ce->value = copy_constant (value);
3105 CONSTRUCTOR_ELTS (copy) = v;
3114 /* Return the alignment of constant EXP in bits. */
3117 get_constant_alignment (tree exp)
3121 align = TYPE_ALIGN (TREE_TYPE (exp));
3122 #ifdef CONSTANT_ALIGNMENT
3123 align = CONSTANT_ALIGNMENT (exp, align);
3128 /* Return the section into which constant EXP should be placed. */
3131 get_constant_section (tree exp)
3133 if (IN_NAMED_SECTION (exp))
3134 return get_named_section (exp, NULL, compute_reloc_for_constant (exp));
3136 return targetm.asm_out.select_section (exp,
3137 compute_reloc_for_constant (exp),
3138 get_constant_alignment (exp));
3141 /* Return the size of constant EXP in bytes. */
3143 static HOST_WIDE_INT
3144 get_constant_size (tree exp)
3148 size = int_size_in_bytes (TREE_TYPE (exp));
3149 if (TREE_CODE (exp) == STRING_CST)
3150 size = MAX (TREE_STRING_LENGTH (exp), size);
3154 /* Subroutine of output_constant_def:
3155 No constant equal to EXP is known to have been output.
3156 Make a constant descriptor to enter EXP in the hash table.
3157 Assign the label number and construct RTL to refer to the
3158 constant's location in memory.
3159 Caller is responsible for updating the hash table. */
3161 static struct constant_descriptor_tree *
3162 build_constant_desc (tree exp)
3168 struct constant_descriptor_tree *desc;
3170 desc = GGC_NEW (struct constant_descriptor_tree);
3171 desc->value = copy_constant (exp);
3173 /* Propagate marked-ness to copied constant. */
3174 if (flag_mudflap && mf_marked_p (exp))
3175 mf_mark (desc->value);
3177 /* Create a string containing the label name, in LABEL. */
3178 labelno = const_labelno++;
3179 ASM_GENERATE_INTERNAL_LABEL (label, "LC", labelno);
3181 /* We have a symbol name; construct the SYMBOL_REF and the MEM. */
3182 if (use_object_blocks_p ())
3184 section *sect = get_constant_section (exp);
3185 symbol = create_block_symbol (ggc_strdup (label),
3186 get_block_for_section (sect), -1);
3189 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3190 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3191 SET_SYMBOL_REF_DECL (symbol, desc->value);
3192 TREE_CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3194 rtl = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), symbol);
3195 set_mem_attributes (rtl, exp, 1);
3196 set_mem_alias_set (rtl, 0);
3197 set_mem_alias_set (rtl, const_alias_set);
3199 /* Set flags or add text to the name to record information, such as
3200 that it is a local symbol. If the name is changed, the macro
3201 ASM_OUTPUT_LABELREF will have to know how to strip this
3202 information. This call might invalidate our local variable
3203 SYMBOL; we can't use it afterward. */
3205 targetm.encode_section_info (exp, rtl, true);
3212 /* Return an rtx representing a reference to constant data in memory
3213 for the constant expression EXP.
3215 If assembler code for such a constant has already been output,
3216 return an rtx to refer to it.
3217 Otherwise, output such a constant in memory
3218 and generate an rtx for it.
3220 If DEFER is nonzero, this constant can be deferred and output only
3221 if referenced in the function after all optimizations.
3223 `const_desc_table' records which constants already have label strings. */
3226 output_constant_def (tree exp, int defer)
3228 struct constant_descriptor_tree *desc;
3229 struct constant_descriptor_tree key;
3232 /* Look up EXP in the table of constant descriptors. If we didn't find
3233 it, create a new one. */
3235 key.hash = const_hash_1 (exp);
3236 loc = htab_find_slot_with_hash (const_desc_htab, &key, key.hash, INSERT);
3238 desc = (struct constant_descriptor_tree *) *loc;
3241 desc = build_constant_desc (exp);
3242 desc->hash = key.hash;
3246 maybe_output_constant_def_contents (desc, defer);
3250 /* Subroutine of output_constant_def: Decide whether or not we need to
3251 output the constant DESC now, and if so, do it. */
3253 maybe_output_constant_def_contents (struct constant_descriptor_tree *desc,
3256 rtx symbol = XEXP (desc->rtl, 0);
3257 tree exp = desc->value;
3259 if (flag_syntax_only)
3262 if (TREE_ASM_WRITTEN (exp))
3263 /* Already output; don't do it again. */
3266 /* We can always defer constants as long as the context allows
3270 /* Increment n_deferred_constants if it exists. It needs to be at
3271 least as large as the number of constants actually referred to
3272 by the function. If it's too small we'll stop looking too early
3273 and fail to emit constants; if it's too large we'll only look
3274 through the entire function when we could have stopped earlier. */
3276 n_deferred_constants++;
3280 output_constant_def_contents (symbol);
3283 /* Subroutine of output_constant_def_contents. Output the definition
3284 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3285 constant's alignment in bits. */
3288 assemble_constant_contents (tree exp, const char *label, unsigned int align)
3292 size = get_constant_size (exp);
3294 /* Do any machine/system dependent processing of the constant. */
3295 #ifdef ASM_DECLARE_CONSTANT_NAME
3296 ASM_DECLARE_CONSTANT_NAME (asm_out_file, label, exp, size);
3298 /* Standard thing is just output label for the constant. */
3299 ASM_OUTPUT_LABEL (asm_out_file, label);
3300 #endif /* ASM_DECLARE_CONSTANT_NAME */
3302 /* Output the value of EXP. */
3303 output_constant (exp, size, align);
3306 /* We must output the constant data referred to by SYMBOL; do so. */
3309 output_constant_def_contents (rtx symbol)
3311 tree exp = SYMBOL_REF_DECL (symbol);
3314 /* Make sure any other constants whose addresses appear in EXP
3315 are assigned label numbers. */
3316 output_addressed_constants (exp);
3318 /* We are no longer deferring this constant. */
3319 TREE_ASM_WRITTEN (exp) = 1;
3321 /* If the constant is part of an object block, make sure that the
3322 decl has been positioned within its block, but do not write out
3323 its definition yet. output_object_blocks will do that later. */
3324 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
3325 place_block_symbol (symbol);
3328 switch_to_section (get_constant_section (exp));
3329 align = get_constant_alignment (exp);
3330 if (align > BITS_PER_UNIT)
3331 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
3332 assemble_constant_contents (exp, XSTR (symbol, 0), align);
3335 mudflap_enqueue_constant (exp);
3338 /* Look up EXP in the table of constant descriptors. Return the rtl
3339 if it has been emitted, else null. */
3342 lookup_constant_def (tree exp)
3344 struct constant_descriptor_tree *desc;
3345 struct constant_descriptor_tree key;
3348 key.hash = const_hash_1 (exp);
3349 desc = (struct constant_descriptor_tree *)
3350 htab_find_with_hash (const_desc_htab, &key, key.hash);
3352 return (desc ? desc->rtl : NULL_RTX);
3355 /* Used in the hash tables to avoid outputting the same constant
3356 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3357 are output once per function, not once per file. */
3358 /* ??? Only a few targets need per-function constant pools. Most
3359 can use one per-file pool. Should add a targetm bit to tell the
3362 struct rtx_constant_pool GTY(())
3364 /* Pointers to first and last constant in pool, as ordered by offset. */
3365 struct constant_descriptor_rtx *first;
3366 struct constant_descriptor_rtx *last;
3368 /* Hash facility for making memory-constants from constant rtl-expressions.
3369 It is used on RISC machines where immediate integer arguments and
3370 constant addresses are restricted so that such constants must be stored
3372 htab_t GTY((param_is (struct constant_descriptor_rtx))) const_rtx_htab;
3374 /* Current offset in constant pool (does not include any
3375 machine-specific header). */
3376 HOST_WIDE_INT offset;
3379 struct constant_descriptor_rtx GTY((chain_next ("%h.next")))
3381 struct constant_descriptor_rtx *next;
3385 HOST_WIDE_INT offset;
3387 enum machine_mode mode;
3393 /* Hash and compare functions for const_rtx_htab. */
3396 const_desc_rtx_hash (const void *ptr)
3398 const struct constant_descriptor_rtx *const desc
3399 = (const struct constant_descriptor_rtx *) ptr;
3404 const_desc_rtx_eq (const void *a, const void *b)
3406 const struct constant_descriptor_rtx *const x
3407 = (const struct constant_descriptor_rtx *) a;
3408 const struct constant_descriptor_rtx *const y
3409 = (const struct constant_descriptor_rtx *) b;
3411 if (x->mode != y->mode)
3413 return rtx_equal_p (x->constant, y->constant);
3416 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3419 const_rtx_hash_1 (rtx *xp, void *data)
3421 unsigned HOST_WIDE_INT hwi;
3422 enum machine_mode mode;
3428 code = GET_CODE (x);
3429 mode = GET_MODE (x);
3430 h = (hashval_t) code * 1048573 + mode;
3438 const int shift = sizeof (hashval_t) * CHAR_BIT;
3439 const int n = sizeof (HOST_WIDE_INT) / sizeof (hashval_t);
3442 h ^= (hashval_t) hwi;
3443 for (i = 1; i < n; ++i)
3446 h ^= (hashval_t) hwi;
3452 if (mode == VOIDmode)
3454 hwi = CONST_DOUBLE_LOW (x) ^ CONST_DOUBLE_HIGH (x);
3458 h ^= real_hash (CONST_DOUBLE_REAL_VALUE (x));
3462 h ^= fixed_hash (CONST_FIXED_VALUE (x));
3468 for (i = XVECLEN (x, 0); i-- > 0; )
3469 h = h * 251 + const_rtx_hash_1 (&XVECEXP (x, 0, i), data);
3474 h ^= htab_hash_string (XSTR (x, 0));
3478 h = h * 251 + CODE_LABEL_NUMBER (XEXP (x, 0));
3482 case UNSPEC_VOLATILE:
3483 h = h * 251 + XINT (x, 1);
3490 hp = (hashval_t *) data;
3491 *hp = *hp * 509 + h;
3495 /* Compute a hash value for X, which should be a constant. */
3498 const_rtx_hash (rtx x)
3501 for_each_rtx (&x, const_rtx_hash_1, &h);
3506 /* Create and return a new rtx constant pool. */
3508 static struct rtx_constant_pool *
3509 create_constant_pool (void)
3511 struct rtx_constant_pool *pool;
3513 pool = GGC_NEW (struct rtx_constant_pool);
3514 pool->const_rtx_htab = htab_create_ggc (31, const_desc_rtx_hash,
3515 const_desc_rtx_eq, NULL);
3522 /* Initialize constant pool hashing for a new function. */
3525 init_varasm_status (void)
3527 crtl->varasm.pool = create_constant_pool ();
3528 crtl->varasm.deferred_constants = 0;
3531 /* Given a MINUS expression, simplify it if both sides
3532 include the same symbol. */
3535 simplify_subtraction (rtx x)
3537 rtx r = simplify_rtx (x);
3541 /* Given a constant rtx X, make (or find) a memory constant for its value
3542 and return a MEM rtx to refer to it in memory. */
3545 force_const_mem (enum machine_mode mode, rtx x)
3547 struct constant_descriptor_rtx *desc, tmp;
3548 struct rtx_constant_pool *pool;
3555 /* If we're not allowed to drop X into the constant pool, don't. */
3556 if (targetm.cannot_force_const_mem (x))
3559 /* Record that this function has used a constant pool entry. */
3560 crtl->uses_const_pool = 1;
3562 /* Decide which pool to use. */
3563 pool = (targetm.use_blocks_for_constant_p (mode, x)
3564 ? shared_constant_pool
3565 : crtl->varasm.pool);
3567 /* Lookup the value in the hashtable. */
3570 hash = const_rtx_hash (x);
3571 slot = htab_find_slot_with_hash (pool->const_rtx_htab, &tmp, hash, INSERT);
3572 desc = (struct constant_descriptor_rtx *) *slot;
3574 /* If the constant was already present, return its memory. */
3576 return copy_rtx (desc->mem);
3578 /* Otherwise, create a new descriptor. */
3579 desc = GGC_NEW (struct constant_descriptor_rtx);
3582 /* Align the location counter as required by EXP's data type. */
3583 align = GET_MODE_ALIGNMENT (mode == VOIDmode ? word_mode : mode);
3584 #ifdef CONSTANT_ALIGNMENT
3586 tree type = lang_hooks.types.type_for_mode (mode, 0);
3587 if (type != NULL_TREE)
3588 align = CONSTANT_ALIGNMENT (make_tree (type, x), align);
3592 pool->offset += (align / BITS_PER_UNIT) - 1;
3593 pool->offset &= ~ ((align / BITS_PER_UNIT) - 1);
3596 desc->constant = tmp.constant;
3597 desc->offset = pool->offset;
3600 desc->align = align;
3601 desc->labelno = const_labelno;
3604 pool->offset += GET_MODE_SIZE (mode);
3606 pool->last->next = desc;
3608 pool->first = pool->last = desc;
3611 /* Create a string containing the label name, in LABEL. */
3612 ASM_GENERATE_INTERNAL_LABEL (label, "LC", const_labelno);
3615 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3616 the constants pool. */
3617 if (use_object_blocks_p () && targetm.use_blocks_for_constant_p (mode, x))
3619 section *sect = targetm.asm_out.select_rtx_section (mode, x, align);
3620 symbol = create_block_symbol (ggc_strdup (label),
3621 get_block_for_section (sect), -1);
3624 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3626 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3627 CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3628 SET_SYMBOL_REF_CONSTANT (symbol, desc);
3630 /* Construct the MEM. */
3631 desc->mem = def = gen_const_mem (mode, symbol);
3632 set_mem_attributes (def, lang_hooks.types.type_for_mode (mode, 0), 1);
3633 set_mem_align (def, align);
3635 /* If we're dropping a label to the constant pool, make sure we
3637 if (GET_CODE (x) == LABEL_REF)
3638 LABEL_PRESERVE_P (XEXP (x, 0)) = 1;
3640 return copy_rtx (def);
3643 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3646 get_pool_constant (rtx addr)
3648 return SYMBOL_REF_CONSTANT (addr)->constant;
3651 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3652 and whether it has been output or not. */
3655 get_pool_constant_mark (rtx addr, bool *pmarked)
3657 struct constant_descriptor_rtx *desc;
3659 desc = SYMBOL_REF_CONSTANT (addr);
3660 *pmarked = (desc->mark != 0);
3661 return desc->constant;
3664 /* Similar, return the mode. */
3667 get_pool_mode (const_rtx addr)
3669 return SYMBOL_REF_CONSTANT (addr)->mode;
3672 /* Return the size of the constant pool. */
3675 get_pool_size (void)
3677 return crtl->varasm.pool->offset;
3680 /* Worker function for output_constant_pool_1. Emit assembly for X
3681 in MODE with known alignment ALIGN. */
3684 output_constant_pool_2 (enum machine_mode mode, rtx x, unsigned int align)
3686 switch (GET_MODE_CLASS (mode))
3689 case MODE_DECIMAL_FLOAT:
3693 gcc_assert (GET_CODE (x) == CONST_DOUBLE);
3694 REAL_VALUE_FROM_CONST_DOUBLE (r, x);
3695 assemble_real (r, mode, align);
3700 case MODE_PARTIAL_INT:
3705 assemble_integer (x, GET_MODE_SIZE (mode), align, 1);
3708 case MODE_VECTOR_FLOAT:
3709 case MODE_VECTOR_INT:
3710 case MODE_VECTOR_FRACT:
3711 case MODE_VECTOR_UFRACT:
3712 case MODE_VECTOR_ACCUM:
3713 case MODE_VECTOR_UACCUM:
3716 enum machine_mode submode = GET_MODE_INNER (mode);
3717 unsigned int subalign = MIN (align, GET_MODE_BITSIZE (submode));
3719 gcc_assert (GET_CODE (x) == CONST_VECTOR);
3720 units = CONST_VECTOR_NUNITS (x);
3722 for (i = 0; i < units; i++)
3724 rtx elt = CONST_VECTOR_ELT (x, i);
3725 output_constant_pool_2 (submode, elt, i ? subalign : align);
3735 /* Worker function for output_constant_pool. Emit constant DESC,
3736 giving it ALIGN bits of alignment. */
3739 output_constant_pool_1 (struct constant_descriptor_rtx *desc,
3746 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3747 whose CODE_LABEL has been deleted. This can occur if a jump table
3748 is eliminated by optimization. If so, write a constant of zero
3749 instead. Note that this can also happen by turning the
3750 CODE_LABEL into a NOTE. */
3751 /* ??? This seems completely and utterly wrong. Certainly it's
3752 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3753 functioning even with INSN_DELETED_P and friends. */
3756 switch (GET_CODE (tmp))
3759 if (GET_CODE (XEXP (tmp, 0)) != PLUS
3760 || GET_CODE (XEXP (XEXP (tmp, 0), 0)) != LABEL_REF)
3762 tmp = XEXP (XEXP (tmp, 0), 0);
3766 tmp = XEXP (tmp, 0);
3767 gcc_assert (!INSN_DELETED_P (tmp));
3768 gcc_assert (!NOTE_P (tmp)
3769 || NOTE_KIND (tmp) != NOTE_INSN_DELETED);
3776 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3777 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file, x, desc->mode,
3778 align, desc->labelno, done);
3781 assemble_align (align);
3783 /* Output the label. */
3784 targetm.asm_out.internal_label (asm_out_file, "LC", desc->labelno);
3786 /* Output the data. */
3787 output_constant_pool_2 (desc->mode, x, align);
3789 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3790 sections have proper size. */
3791 if (align > GET_MODE_BITSIZE (desc->mode)
3793 && (in_section->common.flags & SECTION_MERGE))
3794 assemble_align (align);
3796 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3802 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3803 to as used. Emit referenced deferred strings. This function can
3804 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3807 mark_constant (rtx *current_rtx, void *data ATTRIBUTE_UNUSED)
3809 rtx x = *current_rtx;
3811 if (x == NULL_RTX || GET_CODE (x) != SYMBOL_REF)
3814 if (CONSTANT_POOL_ADDRESS_P (x))
3816 struct constant_descriptor_rtx *desc = SYMBOL_REF_CONSTANT (x);
3817 if (desc->mark == 0)
3820 for_each_rtx (&desc->constant, mark_constant, NULL);
3823 else if (TREE_CONSTANT_POOL_ADDRESS_P (x))
3825 tree exp = SYMBOL_REF_DECL (x);
3826 if (!TREE_ASM_WRITTEN (exp))
3828 n_deferred_constants--;
3829 output_constant_def_contents (x);
3836 /* Look through appropriate parts of INSN, marking all entries in the
3837 constant pool which are actually being used. Entries that are only
3838 referenced by other constants are also marked as used. Emit
3839 deferred strings that are used. */
3842 mark_constants (rtx insn)
3847 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3848 insns, not any notes that may be attached. We don't want to mark
3849 a constant just because it happens to appear in a REG_EQUIV note. */
3850 if (GET_CODE (PATTERN (insn)) == SEQUENCE)
3852 rtx seq = PATTERN (insn);
3853 int i, n = XVECLEN (seq, 0);
3854 for (i = 0; i < n; ++i)
3856 rtx subinsn = XVECEXP (seq, 0, i);
3857 if (INSN_P (subinsn))
3858 for_each_rtx (&PATTERN (subinsn), mark_constant, NULL);
3862 for_each_rtx (&PATTERN (insn), mark_constant, NULL);
3865 /* Look through the instructions for this function, and mark all the
3866 entries in POOL which are actually being used. Emit deferred constants
3867 which have indeed been used. */
3870 mark_constant_pool (void)
3874 if (!crtl->uses_const_pool && n_deferred_constants == 0)
3877 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
3878 mark_constants (insn);
3880 for (link = crtl->epilogue_delay_list;
3882 link = XEXP (link, 1))
3883 mark_constants (XEXP (link, 0));
3886 /* Write all the constants in POOL. */
3889 output_constant_pool_contents (struct rtx_constant_pool *pool)
3891 struct constant_descriptor_rtx *desc;
3893 for (desc = pool->first; desc ; desc = desc->next)
3896 /* If the constant is part of an object_block, make sure that
3897 the constant has been positioned within its block, but do not
3898 write out its definition yet. output_object_blocks will do
3900 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc->sym)
3901 && SYMBOL_REF_BLOCK (desc->sym))
3902 place_block_symbol (desc->sym);
3905 switch_to_section (targetm.asm_out.select_rtx_section
3906 (desc->mode, desc->constant, desc->align));
3907 output_constant_pool_1 (desc, desc->align);
3912 /* Mark all constants that are used in the current function, then write
3913 out the function's private constant pool. */
3916 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED,
3917 tree fndecl ATTRIBUTE_UNUSED)
3919 struct rtx_constant_pool *pool = crtl->varasm.pool;
3921 /* It is possible for gcc to call force_const_mem and then to later
3922 discard the instructions which refer to the constant. In such a
3923 case we do not need to output the constant. */
3924 mark_constant_pool ();
3926 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3927 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file, fnname, fndecl, pool->offset);
3930 output_constant_pool_contents (pool);
3932 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3933 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file, fnname, fndecl, pool->offset);
3937 /* Write the contents of the shared constant pool. */
3940 output_shared_constant_pool (void)
3942 output_constant_pool_contents (shared_constant_pool);
3945 /* Determine what kind of relocations EXP may need. */
3948 compute_reloc_for_constant (tree exp)
3950 int reloc = 0, reloc2;
3953 switch (TREE_CODE (exp))
3957 /* Go inside any operations that get_inner_reference can handle and see
3958 if what's inside is a constant: no need to do anything here for
3959 addresses of variables or functions. */
3960 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
3961 tem = TREE_OPERAND (tem, 0))
3964 if (TREE_PUBLIC (tem))
3971 case POINTER_PLUS_EXPR:
3972 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3973 reloc |= compute_reloc_for_constant (TREE_OPERAND (exp, 1));
3977 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3978 reloc2 = compute_reloc_for_constant (TREE_OPERAND (exp, 1));
3979 /* The difference of two local labels is computable at link time. */
3980 if (reloc == 1 && reloc2 == 1)
3987 case VIEW_CONVERT_EXPR:
3988 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3993 unsigned HOST_WIDE_INT idx;
3994 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
3996 reloc |= compute_reloc_for_constant (tem);
4006 /* Find all the constants whose addresses are referenced inside of EXP,
4007 and make sure assembler code with a label has been output for each one.
4008 Indicate whether an ADDR_EXPR has been encountered. */
4011 output_addressed_constants (tree exp)
4015 switch (TREE_CODE (exp))
4019 /* Go inside any operations that get_inner_reference can handle and see
4020 if what's inside is a constant: no need to do anything here for
4021 addresses of variables or functions. */
4022 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
4023 tem = TREE_OPERAND (tem, 0))
4026 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4027 if (TREE_CODE (tem) == CONST_DECL && DECL_INITIAL (tem))
4028 tem = DECL_INITIAL (tem);
4030 if (CONSTANT_CLASS_P (tem) || TREE_CODE (tem) == CONSTRUCTOR)
4031 output_constant_def (tem, 0);
4035 case POINTER_PLUS_EXPR:
4037 output_addressed_constants (TREE_OPERAND (exp, 1));
4041 case VIEW_CONVERT_EXPR:
4042 output_addressed_constants (TREE_OPERAND (exp, 0));
4047 unsigned HOST_WIDE_INT idx;
4048 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
4050 output_addressed_constants (tem);
4059 /* Whether a constructor CTOR is a valid static constant initializer if all
4060 its elements are. This used to be internal to initializer_constant_valid_p
4061 and has been exposed to let other functions like categorize_ctor_elements
4062 evaluate the property while walking a constructor for other purposes. */
4065 constructor_static_from_elts_p (const_tree ctor)
4067 return (TREE_CONSTANT (ctor)
4068 && (TREE_CODE (TREE_TYPE (ctor)) == UNION_TYPE
4069 || TREE_CODE (TREE_TYPE (ctor)) == RECORD_TYPE)
4070 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (ctor)));
4073 /* A subroutine of initializer_constant_valid_p. VALUE is either a
4074 MINUS_EXPR or a POINTER_PLUS_EXPR. This looks for cases of VALUE
4075 which are valid when ENDTYPE is an integer of any size; in
4076 particular, this does not accept a pointer minus a constant. This
4077 returns null_pointer_node if the VALUE is an absolute constant
4078 which can be used to initialize a static variable. Otherwise it
4082 narrowing_initializer_constant_valid_p (tree value, tree endtype)
4086 if (!INTEGRAL_TYPE_P (endtype))
4089 op0 = TREE_OPERAND (value, 0);
4090 op1 = TREE_OPERAND (value, 1);
4092 /* Like STRIP_NOPS except allow the operand mode to widen. This
4093 works around a feature of fold that simplifies (int)(p1 - p2) to
4094 ((int)p1 - (int)p2) under the theory that the narrower operation
4097 while (CONVERT_EXPR_P (op0)
4098 || TREE_CODE (op0) == NON_LVALUE_EXPR)
4100 tree inner = TREE_OPERAND (op0, 0);
4101 if (inner == error_mark_node
4102 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
4103 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0)))
4104 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
4109 while (CONVERT_EXPR_P (op1)
4110 || TREE_CODE (op1) == NON_LVALUE_EXPR)
4112 tree inner = TREE_OPERAND (op1, 0);
4113 if (inner == error_mark_node
4114 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
4115 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1)))
4116 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
4121 op0 = initializer_constant_valid_p (op0, endtype);
4122 op1 = initializer_constant_valid_p (op1, endtype);
4124 /* Both initializers must be known. */
4128 return null_pointer_node;
4130 /* Support differences between labels. */
4131 if (TREE_CODE (op0) == LABEL_DECL
4132 && TREE_CODE (op1) == LABEL_DECL)
4133 return null_pointer_node;
4135 if (TREE_CODE (op0) == STRING_CST
4136 && TREE_CODE (op1) == STRING_CST
4137 && operand_equal_p (op0, op1, 1))
4138 return null_pointer_node;
4144 /* Return nonzero if VALUE is a valid constant-valued expression
4145 for use in initializing a static variable; one that can be an
4146 element of a "constant" initializer.
4148 Return null_pointer_node if the value is absolute;
4149 if it is relocatable, return the variable that determines the relocation.
4150 We assume that VALUE has been folded as much as possible;
4151 therefore, we do not need to check for such things as
4152 arithmetic-combinations of integers. */
4155 initializer_constant_valid_p (tree value, tree endtype)
4159 switch (TREE_CODE (value))
4162 if (constructor_static_from_elts_p (value))
4164 unsigned HOST_WIDE_INT idx;
4166 bool absolute = true;
4168 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value), idx, elt)
4171 reloc = initializer_constant_valid_p (elt, TREE_TYPE (elt));
4174 if (reloc != null_pointer_node)
4177 /* For a non-absolute relocation, there is no single
4178 variable that can be "the variable that determines the
4180 return absolute ? null_pointer_node : error_mark_node;
4183 return TREE_STATIC (value) ? null_pointer_node : NULL_TREE;
4191 return null_pointer_node;
4196 tree op0 = staticp (TREE_OPERAND (value, 0));
4199 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4200 to be a constant, this is old-skool offsetof-like nonsense. */
4201 if (TREE_CODE (op0) == INDIRECT_REF
4202 && TREE_CONSTANT (TREE_OPERAND (op0, 0)))
4203 return null_pointer_node;
4204 /* Taking the address of a nested function involves a trampoline,
4205 unless we don't need or want one. */
4206 if (TREE_CODE (op0) == FUNCTION_DECL
4207 && decl_function_context (op0)
4208 && !DECL_NO_STATIC_CHAIN (op0)
4209 && !TREE_NO_TRAMPOLINE (value))
4211 /* "&{...}" requires a temporary to hold the constructed
4213 if (TREE_CODE (op0) == CONSTRUCTOR)
4219 case NON_LVALUE_EXPR:
4220 return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype);
4222 case VIEW_CONVERT_EXPR:
4224 tree src = TREE_OPERAND (value, 0);
4225 tree src_type = TREE_TYPE (src);
4226 tree dest_type = TREE_TYPE (value);
4228 /* Allow view-conversions from aggregate to non-aggregate type only
4229 if the bit pattern is fully preserved afterwards; otherwise, the
4230 RTL expander won't be able to apply a subsequent transformation
4231 to the underlying constructor. */
4232 if (AGGREGATE_TYPE_P (src_type) && !AGGREGATE_TYPE_P (dest_type))
4234 if (TYPE_MODE (endtype) == TYPE_MODE (dest_type))
4235 return initializer_constant_valid_p (src, endtype);
4240 /* Allow all other kinds of view-conversion. */
4241 return initializer_constant_valid_p (src, endtype);
4246 tree src = TREE_OPERAND (value, 0);
4247 tree src_type = TREE_TYPE (src);
4248 tree dest_type = TREE_TYPE (value);
4250 /* Allow conversions between pointer types, floating-point
4251 types, and offset types. */
4252 if ((POINTER_TYPE_P (dest_type) && POINTER_TYPE_P (src_type))
4253 || (FLOAT_TYPE_P (dest_type) && FLOAT_TYPE_P (src_type))
4254 || (TREE_CODE (dest_type) == OFFSET_TYPE
4255 && TREE_CODE (src_type) == OFFSET_TYPE))
4256 return initializer_constant_valid_p (src, endtype);
4258 /* Allow length-preserving conversions between integer types. */
4259 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type)
4260 && (TYPE_PRECISION (dest_type) == TYPE_PRECISION (src_type)))
4261 return initializer_constant_valid_p (src, endtype);
4263 /* Allow conversions between other integer types only if
4265 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type))
4267 tree inner = initializer_constant_valid_p (src, endtype);
4268 if (inner == null_pointer_node)
4269 return null_pointer_node;
4273 /* Allow (int) &foo provided int is as wide as a pointer. */
4274 if (INTEGRAL_TYPE_P (dest_type) && POINTER_TYPE_P (src_type)
4275 && (TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type)))
4276 return initializer_constant_valid_p (src, endtype);
4278 /* Likewise conversions from int to pointers, but also allow
4279 conversions from 0. */
4280 if ((POINTER_TYPE_P (dest_type)
4281 || TREE_CODE (dest_type) == OFFSET_TYPE)
4282 && INTEGRAL_TYPE_P (src_type))
4284 if (TREE_CODE (src) == INTEGER_CST
4285 && TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type))
4286 return null_pointer_node;
4287 if (integer_zerop (src))
4288 return null_pointer_node;
4289 else if (TYPE_PRECISION (dest_type) <= TYPE_PRECISION (src_type))
4290 return initializer_constant_valid_p (src, endtype);
4293 /* Allow conversions to struct or union types if the value
4295 if (TREE_CODE (dest_type) == RECORD_TYPE
4296 || TREE_CODE (dest_type) == UNION_TYPE)
4297 return initializer_constant_valid_p (src, endtype);
4301 case POINTER_PLUS_EXPR:
4303 if (! INTEGRAL_TYPE_P (endtype)
4304 || TYPE_PRECISION (endtype) >= POINTER_SIZE)
4306 tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
4308 tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
4310 /* If either term is absolute, use the other term's relocation. */
4311 if (valid0 == null_pointer_node)
4313 if (valid1 == null_pointer_node)
4317 /* Support narrowing pointer differences. */
4318 if (TREE_CODE (value) == POINTER_PLUS_EXPR)
4320 ret = narrowing_initializer_constant_valid_p (value, endtype);
4321 if (ret != NULL_TREE)
4327 if (! INTEGRAL_TYPE_P (endtype)
4328 || TYPE_PRECISION (endtype) >= POINTER_SIZE)
4330 tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
4332 tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
4334 /* Win if second argument is absolute. */
4335 if (valid1 == null_pointer_node)
4337 /* Win if both arguments have the same relocation.
4338 Then the value is absolute. */
4339 if (valid0 == valid1 && valid0 != 0)
4340 return null_pointer_node;
4342 /* Since GCC guarantees that string constants are unique in the
4343 generated code, a subtraction between two copies of the same
4344 constant string is absolute. */
4345 if (valid0 && TREE_CODE (valid0) == STRING_CST
4346 && valid1 && TREE_CODE (valid1) == STRING_CST
4347 && operand_equal_p (valid0, valid1, 1))
4348 return null_pointer_node;
4351 /* Support narrowing differences. */
4352 ret = narrowing_initializer_constant_valid_p (value, endtype);
4353 if (ret != NULL_TREE)
4365 /* Output assembler code for constant EXP to FILE, with no label.
4366 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4367 Assumes output_addressed_constants has been done on EXP already.
4369 Generate exactly SIZE bytes of assembler data, padding at the end
4370 with zeros if necessary. SIZE must always be specified.
4372 SIZE is important for structure constructors,
4373 since trailing members may have been omitted from the constructor.
4374 It is also important for initialization of arrays from string constants
4375 since the full length of the string constant might not be wanted.
4376 It is also needed for initialization of unions, where the initializer's
4377 type is just one member, and that may not be as long as the union.
4379 There a case in which we would fail to output exactly SIZE bytes:
4380 for a structure constructor that wants to produce more than SIZE bytes.
4381 But such constructors will never be generated for any possible input.
4383 ALIGN is the alignment of the data in bits. */
4386 output_constant (tree exp, unsigned HOST_WIDE_INT size, unsigned int align)
4388 enum tree_code code;
4389 unsigned HOST_WIDE_INT thissize;
4391 if (size == 0 || flag_syntax_only)
4394 /* See if we're trying to initialize a pointer in a non-default mode
4395 to the address of some declaration somewhere. If the target says
4396 the mode is valid for pointers, assume the target has a way of
4398 if (TREE_CODE (exp) == NOP_EXPR
4399 && POINTER_TYPE_P (TREE_TYPE (exp))
4400 && targetm.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp))))
4402 tree saved_type = TREE_TYPE (exp);
4404 /* Peel off any intermediate conversions-to-pointer for valid
4406 while (TREE_CODE (exp) == NOP_EXPR
4407 && POINTER_TYPE_P (TREE_TYPE (exp))
4408 && targetm.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp))))
4409 exp = TREE_OPERAND (exp, 0);
4411 /* If what we're left with is the address of something, we can
4412 convert the address to the final type and output it that
4414 if (TREE_CODE (exp) == ADDR_EXPR)
4415 exp = build1 (ADDR_EXPR, saved_type, TREE_OPERAND (exp, 0));
4416 /* Likewise for constant ints. */
4417 else if (TREE_CODE (exp) == INTEGER_CST)
4418 exp = build_int_cst_wide (saved_type, TREE_INT_CST_LOW (exp),
4419 TREE_INT_CST_HIGH (exp));
4423 /* Eliminate any conversions since we'll be outputting the underlying
4425 while (CONVERT_EXPR_P (exp)
4426 || TREE_CODE (exp) == NON_LVALUE_EXPR
4427 || TREE_CODE (exp) == VIEW_CONVERT_EXPR)
4429 HOST_WIDE_INT type_size = int_size_in_bytes (TREE_TYPE (exp));
4430 HOST_WIDE_INT op_size = int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp, 0)));
4432 /* Make sure eliminating the conversion is really a no-op, except with
4433 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4434 union types to allow for Ada unchecked unions. */
4435 if (type_size > op_size
4436 && TREE_CODE (exp) != VIEW_CONVERT_EXPR
4437 && TREE_CODE (TREE_TYPE (exp)) != UNION_TYPE)
4438 /* Keep the conversion. */
4441 exp = TREE_OPERAND (exp, 0);
4444 code = TREE_CODE (TREE_TYPE (exp));
4445 thissize = int_size_in_bytes (TREE_TYPE (exp));
4447 /* Allow a constructor with no elements for any data type.
4448 This means to fill the space with zeros. */
4449 if (TREE_CODE (exp) == CONSTRUCTOR
4450 && VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (exp)))
4452 assemble_zeros (size);
4456 if (TREE_CODE (exp) == FDESC_EXPR)
4458 #ifdef ASM_OUTPUT_FDESC
4459 HOST_WIDE_INT part = tree_low_cst (TREE_OPERAND (exp, 1), 0);
4460 tree decl = TREE_OPERAND (exp, 0);
4461 ASM_OUTPUT_FDESC (asm_out_file, decl, part);
4468 /* Now output the underlying data. If we've handling the padding, return.
4469 Otherwise, break and ensure SIZE is the size written. */
4476 case REFERENCE_TYPE:
4478 case FIXED_POINT_TYPE:
4479 if (! assemble_integer (expand_expr (exp, NULL_RTX, VOIDmode,
4480 EXPAND_INITIALIZER),
4481 MIN (size, thissize), align, 0))
4482 error ("initializer for integer/fixed-point value is too complicated");
4486 if (TREE_CODE (exp) != REAL_CST)
4487 error ("initializer for floating value is not a floating constant");
4489 assemble_real (TREE_REAL_CST (exp), TYPE_MODE (TREE_TYPE (exp)), align);
4493 output_constant (TREE_REALPART (exp), thissize / 2, align);
4494 output_constant (TREE_IMAGPART (exp), thissize / 2,
4495 min_align (align, BITS_PER_UNIT * (thissize / 2)));
4500 switch (TREE_CODE (exp))
4503 output_constructor (exp, size, align);
4506 thissize = MIN ((unsigned HOST_WIDE_INT)TREE_STRING_LENGTH (exp),
4508 assemble_string (TREE_STRING_POINTER (exp), thissize);
4515 unsigned int nalign;
4516 enum machine_mode inner;
4518 inner = TYPE_MODE (TREE_TYPE (TREE_TYPE (exp)));
4519 nalign = MIN (align, GET_MODE_ALIGNMENT (inner));
4521 elt_size = GET_MODE_SIZE (inner);
4523 link = TREE_VECTOR_CST_ELTS (exp);
4524 output_constant (TREE_VALUE (link), elt_size, align);
4525 thissize = elt_size;
4526 while ((link = TREE_CHAIN (link)) != NULL)
4528 output_constant (TREE_VALUE (link), elt_size, nalign);
4529 thissize += elt_size;
4540 gcc_assert (TREE_CODE (exp) == CONSTRUCTOR);
4541 output_constructor (exp, size, align);
4551 if (size > thissize)
4552 assemble_zeros (size - thissize);
4556 /* Subroutine of output_constructor, used for computing the size of
4557 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4558 type with an unspecified upper bound. */
4560 static unsigned HOST_WIDE_INT
4561 array_size_for_constructor (tree val)
4564 unsigned HOST_WIDE_INT cnt;
4565 tree index, value, tmp;
4567 /* This code used to attempt to handle string constants that are not
4568 arrays of single-bytes, but nothing else does, so there's no point in
4570 if (TREE_CODE (val) == STRING_CST)
4571 return TREE_STRING_LENGTH (val);
4573 max_index = NULL_TREE;
4574 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val), cnt, index, value)
4576 if (TREE_CODE (index) == RANGE_EXPR)
4577 index = TREE_OPERAND (index, 1);
4578 if (max_index == NULL_TREE || tree_int_cst_lt (max_index, index))
4582 if (max_index == NULL_TREE)
4585 /* Compute the total number of array elements. */
4586 tmp = TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val)));
4587 i = size_binop (MINUS_EXPR, fold_convert (sizetype, max_index),
4588 fold_convert (sizetype, tmp));
4589 i = size_binop (PLUS_EXPR, i, build_int_cst (sizetype, 1));
4591 /* Multiply by the array element unit size to find number of bytes. */
4592 i = size_binop (MULT_EXPR, i, TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val))));
4594 return tree_low_cst (i, 1);
4597 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
4598 Generate at least SIZE bytes, padding if necessary. */
4601 output_constructor (tree exp, unsigned HOST_WIDE_INT size,
4604 tree type = TREE_TYPE (exp);
4607 /* Number of bytes output or skipped so far.
4608 In other words, current position within the constructor. */
4609 HOST_WIDE_INT total_bytes = 0;
4610 /* Nonzero means BYTE contains part of a byte, to be output. */
4611 int byte_buffer_in_use = 0;
4613 unsigned HOST_WIDE_INT cnt;
4614 constructor_elt *ce;
4616 gcc_assert (HOST_BITS_PER_WIDE_INT >= BITS_PER_UNIT);
4618 if (TREE_CODE (type) == RECORD_TYPE)
4619 field = TYPE_FIELDS (type);
4621 if (TREE_CODE (type) == ARRAY_TYPE
4622 && TYPE_DOMAIN (type) != 0)
4623 min_index = TYPE_MIN_VALUE (TYPE_DOMAIN (type));
4625 /* As LINK goes through the elements of the constant,
4626 FIELD goes through the structure fields, if the constant is a structure.
4627 if the constant is a union, then we override this,
4628 by getting the field from the TREE_LIST element.
4629 But the constant could also be an array. Then FIELD is zero.
4631 There is always a maximum of one element in the chain LINK for unions
4632 (even if the initializer in a source program incorrectly contains
4635 VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (exp), cnt, ce);
4636 cnt++, field = field ? TREE_CHAIN (field) : 0)
4638 tree val = ce->value;
4641 /* The element in a union constructor specifies the proper field
4643 if ((TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE
4644 || TREE_CODE (type) == QUAL_UNION_TYPE)
4648 else if (TREE_CODE (type) == ARRAY_TYPE)
4651 #ifdef ASM_COMMENT_START
4652 if (field && flag_verbose_asm)
4653 fprintf (asm_out_file, "%s %s:\n",
4656 ? IDENTIFIER_POINTER (DECL_NAME (field))
4660 /* Eliminate the marker that makes a cast not be an lvalue. */
4664 if (index && TREE_CODE (index) == RANGE_EXPR)
4666 unsigned HOST_WIDE_INT fieldsize
4667 = int_size_in_bytes (TREE_TYPE (type));
4668 HOST_WIDE_INT lo_index = tree_low_cst (TREE_OPERAND (index, 0), 0);
4669 HOST_WIDE_INT hi_index = tree_low_cst (TREE_OPERAND (index, 1), 0);
4670 HOST_WIDE_INT index;
4671 unsigned int align2 = min_align (align, fieldsize * BITS_PER_UNIT);
4673 for (index = lo_index; index <= hi_index; index++)
4675 /* Output the element's initial value. */
4677 assemble_zeros (fieldsize);
4679 output_constant (val, fieldsize, align2);
4681 /* Count its size. */
4682 total_bytes += fieldsize;
4685 else if (field == 0 || !DECL_BIT_FIELD (field))
4687 /* An element that is not a bit-field. */
4689 unsigned HOST_WIDE_INT fieldsize;
4690 /* Since this structure is static,
4691 we know the positions are constant. */
4692 HOST_WIDE_INT pos = field ? int_byte_position (field) : 0;
4693 unsigned int align2;
4696 pos = (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (val)), 1)
4697 * (tree_low_cst (index, 0) - tree_low_cst (min_index, 0)));
4699 /* Output any buffered-up bit-fields preceding this element. */
4700 if (byte_buffer_in_use)
4702 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4704 byte_buffer_in_use = 0;
4707 /* Advance to offset of this element.
4708 Note no alignment needed in an array, since that is guaranteed
4709 if each element has the proper size. */
4710 if ((field != 0 || index != 0) && pos != total_bytes)
4712 gcc_assert (pos >= total_bytes);
4713 assemble_zeros (pos - total_bytes);
4717 /* Find the alignment of this element. */
4718 align2 = min_align (align, BITS_PER_UNIT * pos);
4720 /* Determine size this element should occupy. */
4725 /* If this is an array with an unspecified upper bound,
4726 the initializer determines the size. */
4727 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4728 but we cannot do this until the deprecated support for
4729 initializing zero-length array members is removed. */
4730 if (TREE_CODE (TREE_TYPE (field)) == ARRAY_TYPE
4731 && TYPE_DOMAIN (TREE_TYPE (field))
4732 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (field))))
4734 fieldsize = array_size_for_constructor (val);
4735 /* Given a non-empty initialization, this field had
4737 gcc_assert (!fieldsize || !TREE_CHAIN (field));
4739 else if (DECL_SIZE_UNIT (field))
4741 /* ??? This can't be right. If the decl size overflows
4742 a host integer we will silently emit no data. */
4743 if (host_integerp (DECL_SIZE_UNIT (field), 1))
4744 fieldsize = tree_low_cst (DECL_SIZE_UNIT (field), 1);
4748 fieldsize = int_size_in_bytes (TREE_TYPE (type));
4750 /* Output the element's initial value. */
4752 assemble_zeros (fieldsize);
4754 output_constant (val, fieldsize, align2);
4756 /* Count its size. */
4757 total_bytes += fieldsize;
4759 else if (val != 0 && TREE_CODE (val) != INTEGER_CST)
4760 error ("invalid initial value for member %qs",
4761 IDENTIFIER_POINTER (DECL_NAME (field)));
4764 /* Element that is a bit-field. */
4766 HOST_WIDE_INT next_offset = int_bit_position (field);
4767 HOST_WIDE_INT end_offset
4768 = (next_offset + tree_low_cst (DECL_SIZE (field), 1));
4771 val = integer_zero_node;
4773 /* If this field does not start in this (or, next) byte,
4775 if (next_offset / BITS_PER_UNIT != total_bytes)
4777 /* Output remnant of any bit field in previous bytes. */
4778 if (byte_buffer_in_use)
4780 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4782 byte_buffer_in_use = 0;
4785 /* If still not at proper byte, advance to there. */
4786 if (next_offset / BITS_PER_UNIT != total_bytes)
4788 gcc_assert (next_offset / BITS_PER_UNIT >= total_bytes);
4789 assemble_zeros (next_offset / BITS_PER_UNIT - total_bytes);
4790 total_bytes = next_offset / BITS_PER_UNIT;
4794 if (! byte_buffer_in_use)
4797 /* We must split the element into pieces that fall within
4798 separate bytes, and combine each byte with previous or
4799 following bit-fields. */
4801 /* next_offset is the offset n fbits from the beginning of
4802 the structure to the next bit of this element to be processed.
4803 end_offset is the offset of the first bit past the end of
4805 while (next_offset < end_offset)
4809 HOST_WIDE_INT value;
4810 HOST_WIDE_INT next_byte = next_offset / BITS_PER_UNIT;
4811 HOST_WIDE_INT next_bit = next_offset % BITS_PER_UNIT;
4813 /* Advance from byte to byte
4814 within this element when necessary. */
4815 while (next_byte != total_bytes)
4817 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4822 /* Number of bits we can process at once
4823 (all part of the same byte). */
4824 this_time = MIN (end_offset - next_offset,
4825 BITS_PER_UNIT - next_bit);
4826 if (BYTES_BIG_ENDIAN)
4828 /* On big-endian machine, take the most significant bits
4829 first (of the bits that are significant)
4830 and put them into bytes from the most significant end. */
4831 shift = end_offset - next_offset - this_time;
4833 /* Don't try to take a bunch of bits that cross
4834 the word boundary in the INTEGER_CST. We can
4835 only select bits from the LOW or HIGH part
4837 if (shift < HOST_BITS_PER_WIDE_INT
4838 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4840 this_time = shift + this_time - HOST_BITS_PER_WIDE_INT;
4841 shift = HOST_BITS_PER_WIDE_INT;
4844 /* Now get the bits from the appropriate constant word. */
4845 if (shift < HOST_BITS_PER_WIDE_INT)
4846 value = TREE_INT_CST_LOW (val);
4849 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
4850 value = TREE_INT_CST_HIGH (val);
4851 shift -= HOST_BITS_PER_WIDE_INT;
4854 /* Get the result. This works only when:
4855 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4856 byte |= (((value >> shift)
4857 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
4858 << (BITS_PER_UNIT - this_time - next_bit));
4862 /* On little-endian machines,
4863 take first the least significant bits of the value
4864 and pack them starting at the least significant
4865 bits of the bytes. */
4866 shift = next_offset - int_bit_position (field);
4868 /* Don't try to take a bunch of bits that cross
4869 the word boundary in the INTEGER_CST. We can
4870 only select bits from the LOW or HIGH part
4872 if (shift < HOST_BITS_PER_WIDE_INT
4873 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4874 this_time = (HOST_BITS_PER_WIDE_INT - shift);
4876 /* Now get the bits from the appropriate constant word. */
4877 if (shift < HOST_BITS_PER_WIDE_INT)
4878 value = TREE_INT_CST_LOW (val);
4881 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
4882 value = TREE_INT_CST_HIGH (val);
4883 shift -= HOST_BITS_PER_WIDE_INT;
4886 /* Get the result. This works only when:
4887 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4888 byte |= (((value >> shift)
4889 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
4893 next_offset += this_time;
4894 byte_buffer_in_use = 1;
4899 if (byte_buffer_in_use)
4901 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4905 if ((unsigned HOST_WIDE_INT)total_bytes < size)
4906 assemble_zeros (size - total_bytes);
4909 /* Mark DECL as weak. */
4912 mark_weak (tree decl)
4914 DECL_WEAK (decl) = 1;
4916 if (DECL_RTL_SET_P (decl)
4917 && MEM_P (DECL_RTL (decl))
4918 && XEXP (DECL_RTL (decl), 0)
4919 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == SYMBOL_REF)
4920 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl), 0)) = 1;
4923 /* Merge weak status between NEWDECL and OLDDECL. */
4926 merge_weak (tree newdecl, tree olddecl)
4928 if (DECL_WEAK (newdecl) == DECL_WEAK (olddecl))
4930 if (DECL_WEAK (newdecl) && SUPPORTS_WEAK)
4933 /* We put the NEWDECL on the weak_decls list at some point
4934 and OLDDECL as well. Keep just OLDDECL on the list. */
4935 for (pwd = &weak_decls; *pwd; pwd = &TREE_CHAIN (*pwd))
4936 if (TREE_VALUE (*pwd) == newdecl)
4938 *pwd = TREE_CHAIN (*pwd);
4945 if (DECL_WEAK (newdecl))
4949 /* NEWDECL is weak, but OLDDECL is not. */
4951 /* If we already output the OLDDECL, we're in trouble; we can't
4952 go back and make it weak. This error cannot be caught in
4953 declare_weak because the NEWDECL and OLDDECL was not yet
4954 been merged; therefore, TREE_ASM_WRITTEN was not set. */
4955 if (TREE_ASM_WRITTEN (olddecl))
4956 error ("weak declaration of %q+D must precede definition",
4959 /* If we've already generated rtl referencing OLDDECL, we may
4960 have done so in a way that will not function properly with
4962 else if (TREE_USED (olddecl)
4963 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl)))
4964 warning (0, "weak declaration of %q+D after first use results "
4965 "in unspecified behavior", newdecl);
4969 /* We put the NEWDECL on the weak_decls list at some point.
4970 Replace it with the OLDDECL. */
4971 for (wd = weak_decls; wd; wd = TREE_CHAIN (wd))
4972 if (TREE_VALUE (wd) == newdecl)
4974 TREE_VALUE (wd) = olddecl;
4977 /* We may not find the entry on the list. If NEWDECL is a
4978 weak alias, then we will have already called
4979 globalize_decl to remove the entry; in that case, we do
4980 not need to do anything. */
4983 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
4984 mark_weak (olddecl);
4987 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
4988 weak. Just update NEWDECL to indicate that it's weak too. */
4989 mark_weak (newdecl);
4992 /* Declare DECL to be a weak symbol. */
4995 declare_weak (tree decl)
4997 if (! TREE_PUBLIC (decl))
4998 error ("weak declaration of %q+D must be public", decl);
4999 else if (TREE_CODE (decl) == FUNCTION_DECL && TREE_ASM_WRITTEN (decl))
5000 error ("weak declaration of %q+D must precede definition", decl);
5001 else if (!SUPPORTS_WEAK)
5002 warning (0, "weak declaration of %q+D not supported", decl);
5008 weak_finish_1 (tree decl)
5010 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5011 const char *const name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5014 if (! TREE_USED (decl))
5017 #ifdef ASM_WEAKEN_DECL
5018 ASM_WEAKEN_DECL (asm_out_file, decl, name, NULL);
5020 #ifdef ASM_WEAKEN_LABEL
5021 ASM_WEAKEN_LABEL (asm_out_file, name);
5023 #ifdef ASM_OUTPUT_WEAK_ALIAS
5025 static bool warn_once = 0;
5028 warning (0, "only weak aliases are supported in this configuration");
5038 /* This TREE_LIST contains weakref targets. */
5040 static GTY(()) tree weakref_targets;
5042 /* Forward declaration. */
5043 static tree find_decl_and_mark_needed (tree decl, tree target);
5045 /* Emit any pending weak declarations. */
5052 for (t = weakref_targets; t; t = TREE_CHAIN (t))
5054 tree alias_decl = TREE_PURPOSE (t);
5055 tree target = ultimate_transparent_alias_target (&TREE_VALUE (t));
5057 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl)))
5058 /* Remove alias_decl from the weak list, but leave entries for
5059 the target alone. */
5061 #ifndef ASM_OUTPUT_WEAKREF
5062 else if (! TREE_SYMBOL_REFERENCED (target))
5064 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5065 defined, otherwise we and weak_finish_1 would use
5066 different macros. */
5067 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5068 ASM_WEAKEN_LABEL (asm_out_file, IDENTIFIER_POINTER (target));
5070 tree decl = find_decl_and_mark_needed (alias_decl, target);
5074 decl = build_decl (TREE_CODE (alias_decl), target,
5075 TREE_TYPE (alias_decl));
5077 DECL_EXTERNAL (decl) = 1;
5078 TREE_PUBLIC (decl) = 1;
5079 DECL_ARTIFICIAL (decl) = 1;
5080 TREE_NOTHROW (decl) = TREE_NOTHROW (alias_decl);
5081 TREE_USED (decl) = 1;
5084 weak_finish_1 (decl);
5093 /* Remove the alias and the target from the pending weak list
5094 so that we do not emit any .weak directives for the former,
5095 nor multiple .weak directives for the latter. */
5096 for (p = &weak_decls; (t2 = *p) ; )
5098 if (TREE_VALUE (t2) == alias_decl
5099 || target == DECL_ASSEMBLER_NAME (TREE_VALUE (t2)))
5100 *p = TREE_CHAIN (t2);
5102 p = &TREE_CHAIN (t2);
5105 /* Remove other weakrefs to the same target, to speed things up. */
5106 for (p = &TREE_CHAIN (t); (t2 = *p) ; )
5108 if (target == ultimate_transparent_alias_target (&TREE_VALUE (t2)))
5109 *p = TREE_CHAIN (t2);
5111 p = &TREE_CHAIN (t2);
5116 for (t = weak_decls; t; t = TREE_CHAIN (t))
5118 tree decl = TREE_VALUE (t);
5120 weak_finish_1 (decl);
5124 /* Emit the assembly bits to indicate that DECL is globally visible. */
5127 globalize_decl (tree decl)
5130 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5131 if (DECL_WEAK (decl))
5133 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
5136 #ifdef ASM_WEAKEN_DECL
5137 ASM_WEAKEN_DECL (asm_out_file, decl, name, 0);
5139 ASM_WEAKEN_LABEL (asm_out_file, name);
5142 /* Remove this function from the pending weak list so that
5143 we do not emit multiple .weak directives for it. */
5144 for (p = &weak_decls; (t = *p) ; )
5146 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
5147 *p = TREE_CHAIN (t);
5149 p = &TREE_CHAIN (t);
5152 /* Remove weakrefs to the same target from the pending weakref
5153 list, for the same reason. */
5154 for (p = &weakref_targets; (t = *p) ; )
5156 if (DECL_ASSEMBLER_NAME (decl)
5157 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
5158 *p = TREE_CHAIN (t);
5160 p = &TREE_CHAIN (t);
5167 targetm.asm_out.globalize_decl_name (asm_out_file, decl);
5170 /* We have to be able to tell cgraph about the needed-ness of the target
5171 of an alias. This requires that the decl have been defined. Aliases
5172 that precede their definition have to be queued for later processing. */
5174 typedef struct alias_pair GTY(())
5180 /* Define gc'd vector type. */
5181 DEF_VEC_O(alias_pair);
5182 DEF_VEC_ALLOC_O(alias_pair,gc);
5184 static GTY(()) VEC(alias_pair,gc) *alias_pairs;
5186 /* Given an assembly name, find the decl it is associated with. At the
5187 same time, mark it needed for cgraph. */
5190 find_decl_and_mark_needed (tree decl, tree target)
5192 struct cgraph_node *fnode = NULL;
5193 struct varpool_node *vnode = NULL;
5195 if (TREE_CODE (decl) == FUNCTION_DECL)
5197 fnode = cgraph_node_for_asm (target);
5199 vnode = varpool_node_for_asm (target);
5203 vnode = varpool_node_for_asm (target);
5205 fnode = cgraph_node_for_asm (target);
5210 /* We can't mark function nodes as used after cgraph global info
5211 is finished. This wouldn't generally be necessary, but C++
5212 virtual table thunks are introduced late in the game and
5213 might seem like they need marking, although in fact they
5215 if (! cgraph_global_info_ready)
5216 cgraph_mark_needed_node (fnode);
5221 varpool_mark_needed_node (vnode);
5228 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5229 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5230 tree node is DECL to have the value of the tree node TARGET. */
5233 do_assemble_alias (tree decl, tree target)
5235 if (TREE_ASM_WRITTEN (decl))
5238 TREE_ASM_WRITTEN (decl) = 1;
5239 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl)) = 1;
5241 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
5243 ultimate_transparent_alias_target (&target);
5245 if (!targetm.have_tls
5246 && TREE_CODE (decl) == VAR_DECL
5247 && DECL_THREAD_LOCAL_P (decl))
5249 decl = emutls_decl (decl);
5250 target = get_emutls_object_name (target);
5253 if (!TREE_SYMBOL_REFERENCED (target))
5254 weakref_targets = tree_cons (decl, target, weakref_targets);
5256 #ifdef ASM_OUTPUT_WEAKREF
5257 ASM_OUTPUT_WEAKREF (asm_out_file, decl,
5258 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
5259 IDENTIFIER_POINTER (target));
5263 error ("%Jweakref is not supported in this configuration", decl);
5270 if (!targetm.have_tls
5271 && TREE_CODE (decl) == VAR_DECL
5272 && DECL_THREAD_LOCAL_P (decl))
5274 decl = emutls_decl (decl);
5275 target = get_emutls_object_name (target);
5278 #ifdef ASM_OUTPUT_DEF
5279 /* Make name accessible from other files, if appropriate. */
5281 if (TREE_PUBLIC (decl))
5283 globalize_decl (decl);
5284 maybe_assemble_visibility (decl);
5287 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5288 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file, decl, target);
5290 ASM_OUTPUT_DEF (asm_out_file,
5291 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
5292 IDENTIFIER_POINTER (target));
5294 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5299 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5300 # ifdef ASM_WEAKEN_DECL
5301 ASM_WEAKEN_DECL (asm_out_file, decl, name, IDENTIFIER_POINTER (target));
5303 ASM_OUTPUT_WEAK_ALIAS (asm_out_file, name, IDENTIFIER_POINTER (target));
5305 /* Remove this function from the pending weak list so that
5306 we do not emit multiple .weak directives for it. */
5307 for (p = &weak_decls; (t = *p) ; )
5308 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
5309 *p = TREE_CHAIN (t);
5311 p = &TREE_CHAIN (t);
5313 /* Remove weakrefs to the same target from the pending weakref
5314 list, for the same reason. */
5315 for (p = &weakref_targets; (t = *p) ; )
5317 if (DECL_ASSEMBLER_NAME (decl)
5318 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
5319 *p = TREE_CHAIN (t);
5321 p = &TREE_CHAIN (t);
5327 /* First pass of completing pending aliases. Make sure that cgraph knows
5328 which symbols will be required. */
5331 finish_aliases_1 (void)
5336 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); i++)
5340 target_decl = find_decl_and_mark_needed (p->decl, p->target);
5341 if (target_decl == NULL)
5343 if (! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
5344 error ("%q+D aliased to undefined symbol %qs",
5345 p->decl, IDENTIFIER_POINTER (p->target));
5347 else if (DECL_EXTERNAL (target_decl)
5348 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
5349 error ("%q+D aliased to external symbol %qs",
5350 p->decl, IDENTIFIER_POINTER (p->target));
5354 /* Second pass of completing pending aliases. Emit the actual assembly.
5355 This happens at the end of compilation and thus it is assured that the
5356 target symbol has been emitted. */
5359 finish_aliases_2 (void)
5364 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); i++)
5365 do_assemble_alias (p->decl, p->target);
5367 VEC_truncate (alias_pair, alias_pairs, 0);
5370 /* Emit an assembler directive to make the symbol for DECL an alias to
5371 the symbol for TARGET. */
5374 assemble_alias (tree decl, tree target)
5377 bool is_weakref = false;
5379 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
5381 tree alias = DECL_ASSEMBLER_NAME (decl);
5385 ultimate_transparent_alias_target (&target);
5387 if (alias == target)
5388 error ("weakref %q+D ultimately targets itself", decl);
5391 #ifndef ASM_OUTPUT_WEAKREF
5392 IDENTIFIER_TRANSPARENT_ALIAS (alias) = 1;
5393 TREE_CHAIN (alias) = target;
5396 if (TREE_PUBLIC (decl))
5397 error ("weakref %q+D must have static linkage", decl);
5401 #if !defined (ASM_OUTPUT_DEF)
5402 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5403 error ("%Jalias definitions not supported in this configuration", decl);
5406 if (!DECL_WEAK (decl))
5408 error ("%Jonly weak aliases are supported in this configuration", decl);
5415 /* We must force creation of DECL_RTL for debug info generation, even though
5416 we don't use it here. */
5417 make_decl_rtl (decl);
5418 TREE_USED (decl) = 1;
5420 /* A quirk of the initial implementation of aliases required that the user
5421 add "extern" to all of them. Which is silly, but now historical. Do
5422 note that the symbol is in fact locally defined. */
5424 DECL_EXTERNAL (decl) = 0;
5426 /* Allow aliases to aliases. */
5427 if (TREE_CODE (decl) == FUNCTION_DECL)
5428 cgraph_node (decl)->alias = true;
5430 varpool_node (decl)->alias = true;
5432 /* If the target has already been emitted, we don't have to queue the
5433 alias. This saves a tad of memory. */
5434 if (cgraph_global_info_ready)
5435 target_decl = find_decl_and_mark_needed (decl, target);
5438 if (target_decl && TREE_ASM_WRITTEN (target_decl))
5439 do_assemble_alias (decl, target);
5442 alias_pair *p = VEC_safe_push (alias_pair, gc, alias_pairs, NULL);
5448 /* Emit an assembler directive to set symbol for DECL visibility to
5449 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5452 default_assemble_visibility (tree decl, int vis)
5454 static const char * const visibility_types[] = {
5455 NULL, "protected", "hidden", "internal"
5458 const char *name, *type;
5460 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5461 type = visibility_types[vis];
5463 #ifdef HAVE_GAS_HIDDEN
5464 fprintf (asm_out_file, "\t.%s\t", type);
5465 assemble_name (asm_out_file, name);
5466 fprintf (asm_out_file, "\n");
5468 warning (OPT_Wattributes, "visibility attribute not supported "
5469 "in this configuration; ignored");
5473 /* A helper function to call assemble_visibility when needed for a decl. */
5476 maybe_assemble_visibility (tree decl)
5478 enum symbol_visibility vis = DECL_VISIBILITY (decl);
5480 if (vis != VISIBILITY_DEFAULT)
5482 targetm.asm_out.visibility (decl, vis);
5489 /* Returns 1 if the target configuration supports defining public symbols
5490 so that one of them will be chosen at link time instead of generating a
5491 multiply-defined symbol error, whether through the use of weak symbols or
5492 a target-specific mechanism for having duplicates discarded. */
5495 supports_one_only (void)
5497 if (SUPPORTS_ONE_ONLY)
5499 return SUPPORTS_WEAK;
5502 /* Set up DECL as a public symbol that can be defined in multiple
5503 translation units without generating a linker error. */
5506 make_decl_one_only (tree decl)
5508 gcc_assert (TREE_CODE (decl) == VAR_DECL
5509 || TREE_CODE (decl) == FUNCTION_DECL);
5511 TREE_PUBLIC (decl) = 1;
5513 if (SUPPORTS_ONE_ONLY)
5515 #ifdef MAKE_DECL_ONE_ONLY
5516 MAKE_DECL_ONE_ONLY (decl);
5518 DECL_ONE_ONLY (decl) = 1;
5520 else if (TREE_CODE (decl) == VAR_DECL
5521 && (DECL_INITIAL (decl) == 0 || DECL_INITIAL (decl) == error_mark_node))
5522 DECL_COMMON (decl) = 1;
5525 gcc_assert (SUPPORTS_WEAK);
5526 DECL_WEAK (decl) = 1;
5531 init_varasm_once (void)
5533 section_htab = htab_create_ggc (31, section_entry_hash,
5534 section_entry_eq, NULL);
5535 object_block_htab = htab_create_ggc (31, object_block_entry_hash,
5536 object_block_entry_eq, NULL);
5537 const_desc_htab = htab_create_ggc (1009, const_desc_hash,
5538 const_desc_eq, NULL);
5540 const_alias_set = new_alias_set ();
5541 shared_constant_pool = create_constant_pool ();
5543 #ifdef TEXT_SECTION_ASM_OP
5544 text_section = get_unnamed_section (SECTION_CODE, output_section_asm_op,
5545 TEXT_SECTION_ASM_OP);
5548 #ifdef DATA_SECTION_ASM_OP
5549 data_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
5550 DATA_SECTION_ASM_OP);
5553 #ifdef SDATA_SECTION_ASM_OP
5554 sdata_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
5555 SDATA_SECTION_ASM_OP);
5558 #ifdef READONLY_DATA_SECTION_ASM_OP
5559 readonly_data_section = get_unnamed_section (0, output_section_asm_op,
5560 READONLY_DATA_SECTION_ASM_OP);
5563 #ifdef CTORS_SECTION_ASM_OP
5564 ctors_section = get_unnamed_section (0, output_section_asm_op,
5565 CTORS_SECTION_ASM_OP);
5568 #ifdef DTORS_SECTION_ASM_OP
5569 dtors_section = get_unnamed_section (0, output_section_asm_op,
5570 DTORS_SECTION_ASM_OP);
5573 #ifdef BSS_SECTION_ASM_OP
5574 bss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
5575 output_section_asm_op,
5576 BSS_SECTION_ASM_OP);
5579 #ifdef SBSS_SECTION_ASM_OP
5580 sbss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
5581 output_section_asm_op,
5582 SBSS_SECTION_ASM_OP);
5585 tls_comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5586 | SECTION_COMMON, emit_tls_common);
5587 lcomm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5588 | SECTION_COMMON, emit_local);
5589 comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5590 | SECTION_COMMON, emit_common);
5592 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
5593 bss_noswitch_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS,
5597 targetm.asm_out.init_sections ();
5599 if (readonly_data_section == NULL)
5600 readonly_data_section = text_section;
5604 decl_default_tls_model (const_tree decl)
5606 enum tls_model kind;
5609 is_local = targetm.binds_local_p (decl);
5613 kind = TLS_MODEL_LOCAL_EXEC;
5615 kind = TLS_MODEL_INITIAL_EXEC;
5618 /* Local dynamic is inefficient when we're not combining the
5619 parts of the address. */
5620 else if (optimize && is_local)
5621 kind = TLS_MODEL_LOCAL_DYNAMIC;
5623 kind = TLS_MODEL_GLOBAL_DYNAMIC;
5624 if (kind < flag_tls_default)
5625 kind = flag_tls_default;
5630 /* Select a set of attributes for section NAME based on the properties
5631 of DECL and whether or not RELOC indicates that DECL's initializer
5632 might contain runtime relocations.
5634 We make the section read-only and executable for a function decl,
5635 read-only for a const data decl, and writable for a non-const data decl. */
5638 default_section_type_flags (tree decl, const char *name, int reloc)
5642 if (decl && TREE_CODE (decl) == FUNCTION_DECL)
5643 flags = SECTION_CODE;
5644 else if (decl && decl_readonly_section (decl, reloc))
5646 else if (current_function_decl
5648 && crtl->subsections.unlikely_text_section_name
5649 && strcmp (name, crtl->subsections.unlikely_text_section_name) == 0)
5650 flags = SECTION_CODE;
5652 && (!current_function_decl || !cfun)
5653 && strcmp (name, UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
5654 flags = SECTION_CODE;
5656 flags = SECTION_WRITE;
5658 if (decl && DECL_ONE_ONLY (decl))
5659 flags |= SECTION_LINKONCE;
5661 if (decl && TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
5662 flags |= SECTION_TLS | SECTION_WRITE;
5664 if (strcmp (name, ".bss") == 0
5665 || strncmp (name, ".bss.", 5) == 0
5666 || strncmp (name, ".gnu.linkonce.b.", 16) == 0
5667 || strcmp (name, ".sbss") == 0
5668 || strncmp (name, ".sbss.", 6) == 0
5669 || strncmp (name, ".gnu.linkonce.sb.", 17) == 0)
5670 flags |= SECTION_BSS;
5672 if (strcmp (name, ".tdata") == 0
5673 || strncmp (name, ".tdata.", 7) == 0
5674 || strncmp (name, ".gnu.linkonce.td.", 17) == 0)
5675 flags |= SECTION_TLS;
5677 if (strcmp (name, ".tbss") == 0
5678 || strncmp (name, ".tbss.", 6) == 0
5679 || strncmp (name, ".gnu.linkonce.tb.", 17) == 0)
5680 flags |= SECTION_TLS | SECTION_BSS;
5682 /* These three sections have special ELF types. They are neither
5683 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
5684 want to print a section type (@progbits or @nobits). If someone
5685 is silly enough to emit code or TLS variables to one of these
5686 sections, then don't handle them specially. */
5687 if (!(flags & (SECTION_CODE | SECTION_BSS | SECTION_TLS))
5688 && (strcmp (name, ".init_array") == 0
5689 || strcmp (name, ".fini_array") == 0
5690 || strcmp (name, ".preinit_array") == 0))
5691 flags |= SECTION_NOTYPE;
5696 /* Return true if the target supports some form of global BSS,
5697 either through bss_noswitch_section, or by selecting a BSS
5698 section in TARGET_ASM_SELECT_SECTION. */
5701 have_global_bss_p (void)
5703 return bss_noswitch_section || targetm.have_switchable_bss_sections;
5706 /* Output assembly to switch to section NAME with attribute FLAGS.
5707 Four variants for common object file formats. */
5710 default_no_named_section (const char *name ATTRIBUTE_UNUSED,
5711 unsigned int flags ATTRIBUTE_UNUSED,
5712 tree decl ATTRIBUTE_UNUSED)
5714 /* Some object formats don't support named sections at all. The
5715 front-end should already have flagged this as an error. */
5720 default_elf_asm_named_section (const char *name, unsigned int flags,
5721 tree decl ATTRIBUTE_UNUSED)
5723 char flagchars[10], *f = flagchars;
5725 /* If we have already declared this section, we can use an
5726 abbreviated form to switch back to it -- unless this section is
5727 part of a COMDAT groups, in which case GAS requires the full
5728 declaration every time. */
5729 if (!(HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5730 && (flags & SECTION_DECLARED))
5732 fprintf (asm_out_file, "\t.section\t%s\n", name);
5736 if (!(flags & SECTION_DEBUG))
5738 if (flags & SECTION_WRITE)
5740 if (flags & SECTION_CODE)
5742 if (flags & SECTION_SMALL)
5744 if (flags & SECTION_MERGE)
5746 if (flags & SECTION_STRINGS)
5748 if (flags & SECTION_TLS)
5750 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5754 fprintf (asm_out_file, "\t.section\t%s,\"%s\"", name, flagchars);
5756 if (!(flags & SECTION_NOTYPE))
5761 if (flags & SECTION_BSS)
5767 #ifdef ASM_COMMENT_START
5768 /* On platforms that use "@" as the assembly comment character,
5770 if (strcmp (ASM_COMMENT_START, "@") == 0)
5773 fprintf (asm_out_file, format, type);
5775 if (flags & SECTION_ENTSIZE)
5776 fprintf (asm_out_file, ",%d", flags & SECTION_ENTSIZE);
5777 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5778 fprintf (asm_out_file, ",%s,comdat",
5779 lang_hooks.decls.comdat_group (decl));
5782 putc ('\n', asm_out_file);
5786 default_coff_asm_named_section (const char *name, unsigned int flags,
5787 tree decl ATTRIBUTE_UNUSED)
5789 char flagchars[8], *f = flagchars;
5791 if (flags & SECTION_WRITE)
5793 if (flags & SECTION_CODE)
5797 fprintf (asm_out_file, "\t.section\t%s,\"%s\"\n", name, flagchars);
5801 default_pe_asm_named_section (const char *name, unsigned int flags,
5804 default_coff_asm_named_section (name, flags, decl);
5806 if (flags & SECTION_LINKONCE)
5808 /* Functions may have been compiled at various levels of
5809 optimization so we can't use `same_size' here.
5810 Instead, have the linker pick one. */
5811 fprintf (asm_out_file, "\t.linkonce %s\n",
5812 (flags & SECTION_CODE ? "discard" : "same_size"));
5816 /* The lame default section selector. */
5819 default_select_section (tree decl, int reloc,
5820 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
5824 if (decl_readonly_section (decl, reloc))
5825 return readonly_data_section;
5827 else if (TREE_CODE (decl) == CONSTRUCTOR)
5829 if (! ((flag_pic && reloc)
5830 || !TREE_READONLY (decl)
5831 || TREE_SIDE_EFFECTS (decl)
5832 || !TREE_CONSTANT (decl)))
5833 return readonly_data_section;
5835 else if (TREE_CODE (decl) == STRING_CST)
5836 return readonly_data_section;
5837 else if (! (flag_pic && reloc))
5838 return readonly_data_section;
5840 return data_section;
5843 enum section_category
5844 categorize_decl_for_section (const_tree decl, int reloc)
5846 enum section_category ret;
5848 if (TREE_CODE (decl) == FUNCTION_DECL)
5850 else if (TREE_CODE (decl) == STRING_CST)
5852 if (flag_mudflap) /* or !flag_merge_constants */
5853 return SECCAT_RODATA;
5855 return SECCAT_RODATA_MERGE_STR;
5857 else if (TREE_CODE (decl) == VAR_DECL)
5859 if (bss_initializer_p (decl))
5861 else if (! TREE_READONLY (decl)
5862 || TREE_SIDE_EFFECTS (decl)
5863 || ! TREE_CONSTANT (DECL_INITIAL (decl)))
5865 /* Here the reloc_rw_mask is not testing whether the section should
5866 be read-only or not, but whether the dynamic link will have to
5867 do something. If so, we wish to segregate the data in order to
5868 minimize cache misses inside the dynamic linker. */
5869 if (reloc & targetm.asm_out.reloc_rw_mask ())
5870 ret = reloc == 1 ? SECCAT_DATA_REL_LOCAL : SECCAT_DATA_REL;
5874 else if (reloc & targetm.asm_out.reloc_rw_mask ())
5875 ret = reloc == 1 ? SECCAT_DATA_REL_RO_LOCAL : SECCAT_DATA_REL_RO;
5876 else if (reloc || flag_merge_constants < 2)
5877 /* C and C++ don't allow different variables to share the same
5878 location. -fmerge-all-constants allows even that (at the
5879 expense of not conforming). */
5880 ret = SECCAT_RODATA;
5881 else if (TREE_CODE (DECL_INITIAL (decl)) == STRING_CST)
5882 ret = SECCAT_RODATA_MERGE_STR_INIT;
5884 ret = SECCAT_RODATA_MERGE_CONST;
5886 else if (TREE_CODE (decl) == CONSTRUCTOR)
5888 if ((reloc & targetm.asm_out.reloc_rw_mask ())
5889 || TREE_SIDE_EFFECTS (decl)
5890 || ! TREE_CONSTANT (decl))
5893 ret = SECCAT_RODATA;
5896 ret = SECCAT_RODATA;
5898 /* There are no read-only thread-local sections. */
5899 if (TREE_CODE (decl) == VAR_DECL && DECL_TLS_MODEL (decl))
5901 if (DECL_TLS_MODEL (decl) == TLS_MODEL_EMULATED)
5903 if (DECL_EMUTLS_VAR_P (decl))
5905 if (targetm.emutls.var_section)
5906 ret = SECCAT_EMUTLS_VAR;
5910 if (targetm.emutls.tmpl_prefix)
5911 ret = SECCAT_EMUTLS_TMPL;
5914 /* Note that this would be *just* SECCAT_BSS, except that there's
5915 no concept of a read-only thread-local-data section. */
5916 else if (ret == SECCAT_BSS
5917 || (flag_zero_initialized_in_bss
5918 && initializer_zerop (DECL_INITIAL (decl))))
5924 /* If the target uses small data sections, select it. */
5925 else if (targetm.in_small_data_p (decl))
5927 if (ret == SECCAT_BSS)
5929 else if (targetm.have_srodata_section && ret == SECCAT_RODATA)
5930 ret = SECCAT_SRODATA;
5939 decl_readonly_section (const_tree decl, int reloc)
5941 switch (categorize_decl_for_section (decl, reloc))
5944 case SECCAT_RODATA_MERGE_STR:
5945 case SECCAT_RODATA_MERGE_STR_INIT:
5946 case SECCAT_RODATA_MERGE_CONST:
5947 case SECCAT_SRODATA:
5956 /* Select a section based on the above categorization. */
5959 default_elf_select_section (tree decl, int reloc,
5960 unsigned HOST_WIDE_INT align)
5963 switch (categorize_decl_for_section (decl, reloc))
5966 /* We're not supposed to be called on FUNCTION_DECLs. */
5969 return readonly_data_section;
5970 case SECCAT_RODATA_MERGE_STR:
5971 return mergeable_string_section (decl, align, 0);
5972 case SECCAT_RODATA_MERGE_STR_INIT:
5973 return mergeable_string_section (DECL_INITIAL (decl), align, 0);
5974 case SECCAT_RODATA_MERGE_CONST:
5975 return mergeable_constant_section (DECL_MODE (decl), align, 0);
5976 case SECCAT_SRODATA:
5980 return data_section;
5981 case SECCAT_DATA_REL:
5982 sname = ".data.rel";
5984 case SECCAT_DATA_REL_LOCAL:
5985 sname = ".data.rel.local";
5987 case SECCAT_DATA_REL_RO:
5988 sname = ".data.rel.ro";
5990 case SECCAT_DATA_REL_RO_LOCAL:
5991 sname = ".data.rel.ro.local";
6010 case SECCAT_EMUTLS_VAR:
6011 sname = targetm.emutls.var_section;
6013 case SECCAT_EMUTLS_TMPL:
6014 sname = targetm.emutls.tmpl_section;
6022 return get_named_section (decl, sname, reloc);
6025 /* Construct a unique section name based on the decl name and the
6026 categorization performed above. */
6029 default_unique_section (tree decl, int reloc)
6031 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6032 bool one_only = DECL_ONE_ONLY (decl) && !HAVE_COMDAT_GROUP;
6033 const char *prefix, *name, *linkonce;
6036 switch (categorize_decl_for_section (decl, reloc))
6039 prefix = one_only ? ".t" : ".text";
6042 case SECCAT_RODATA_MERGE_STR:
6043 case SECCAT_RODATA_MERGE_STR_INIT:
6044 case SECCAT_RODATA_MERGE_CONST:
6045 prefix = one_only ? ".r" : ".rodata";
6047 case SECCAT_SRODATA:
6048 prefix = one_only ? ".s2" : ".sdata2";
6051 prefix = one_only ? ".d" : ".data";
6053 case SECCAT_DATA_REL:
6054 prefix = one_only ? ".d.rel" : ".data.rel";
6056 case SECCAT_DATA_REL_LOCAL:
6057 prefix = one_only ? ".d.rel.local" : ".data.rel.local";
6059 case SECCAT_DATA_REL_RO:
6060 prefix = one_only ? ".d.rel.ro" : ".data.rel.ro";
6062 case SECCAT_DATA_REL_RO_LOCAL:
6063 prefix = one_only ? ".d.rel.ro.local" : ".data.rel.ro.local";
6066 prefix = one_only ? ".s" : ".sdata";
6069 prefix = one_only ? ".b" : ".bss";
6072 prefix = one_only ? ".sb" : ".sbss";
6075 prefix = one_only ? ".td" : ".tdata";
6078 prefix = one_only ? ".tb" : ".tbss";
6080 case SECCAT_EMUTLS_VAR:
6081 prefix = targetm.emutls.var_section;
6083 case SECCAT_EMUTLS_TMPL:
6084 prefix = targetm.emutls.tmpl_section;
6090 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
6091 name = targetm.strip_name_encoding (name);
6093 /* If we're using one_only, then there needs to be a .gnu.linkonce
6094 prefix to the section name. */
6095 linkonce = one_only ? ".gnu.linkonce" : "";
6097 string = ACONCAT ((linkonce, prefix, ".", name, NULL));
6099 DECL_SECTION_NAME (decl) = build_string (strlen (string), string);
6102 /* Like compute_reloc_for_constant, except for an RTX. The return value
6103 is a mask for which bit 1 indicates a global relocation, and bit 0
6104 indicates a local relocation. */
6107 compute_reloc_for_rtx_1 (rtx *xp, void *data)
6109 int *preloc = (int *) data;
6112 switch (GET_CODE (x))
6115 *preloc |= SYMBOL_REF_LOCAL_P (x) ? 1 : 2;
6128 compute_reloc_for_rtx (rtx x)
6132 switch (GET_CODE (x))
6138 for_each_rtx (&x, compute_reloc_for_rtx_1, &reloc);
6147 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED,
6149 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
6151 if (compute_reloc_for_rtx (x) & targetm.asm_out.reloc_rw_mask ())
6152 return data_section;
6154 return readonly_data_section;
6158 default_elf_select_rtx_section (enum machine_mode mode, rtx x,
6159 unsigned HOST_WIDE_INT align)
6161 int reloc = compute_reloc_for_rtx (x);
6163 /* ??? Handle small data here somehow. */
6165 if (reloc & targetm.asm_out.reloc_rw_mask ())
6168 return get_named_section (NULL, ".data.rel.ro.local", 1);
6170 return get_named_section (NULL, ".data.rel.ro", 3);
6173 return mergeable_constant_section (mode, align, 0);
6176 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6179 default_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
6184 /* Careful not to prod global register variables. */
6187 symbol = XEXP (rtl, 0);
6188 if (GET_CODE (symbol) != SYMBOL_REF)
6191 flags = SYMBOL_REF_FLAGS (symbol) & SYMBOL_FLAG_HAS_BLOCK_INFO;
6192 if (TREE_CODE (decl) == FUNCTION_DECL)
6193 flags |= SYMBOL_FLAG_FUNCTION;
6194 if (targetm.binds_local_p (decl))
6195 flags |= SYMBOL_FLAG_LOCAL;
6196 if (targetm.have_tls && TREE_CODE (decl) == VAR_DECL
6197 && DECL_THREAD_LOCAL_P (decl))
6198 flags |= DECL_TLS_MODEL (decl) << SYMBOL_FLAG_TLS_SHIFT;
6199 else if (targetm.in_small_data_p (decl))
6200 flags |= SYMBOL_FLAG_SMALL;
6201 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6202 being PUBLIC, the thing *must* be defined in this translation unit.
6203 Prevent this buglet from being propagated into rtl code as well. */
6204 if (DECL_P (decl) && DECL_EXTERNAL (decl) && TREE_PUBLIC (decl))
6205 flags |= SYMBOL_FLAG_EXTERNAL;
6207 SYMBOL_REF_FLAGS (symbol) = flags;
6210 /* By default, we do nothing for encode_section_info, so we need not
6211 do anything but discard the '*' marker. */
6214 default_strip_name_encoding (const char *str)
6216 return str + (*str == '*');
6219 #ifdef ASM_OUTPUT_DEF
6220 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6221 anchor relative to ".", the current section position. */
6224 default_asm_output_anchor (rtx symbol)
6228 sprintf (buffer, "*. + " HOST_WIDE_INT_PRINT_DEC,
6229 SYMBOL_REF_BLOCK_OFFSET (symbol));
6230 ASM_OUTPUT_DEF (asm_out_file, XSTR (symbol, 0), buffer);
6234 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6237 default_use_anchors_for_symbol_p (const_rtx symbol)
6242 /* Don't use anchors for mergeable sections. The linker might move
6243 the objects around. */
6244 sect = SYMBOL_REF_BLOCK (symbol)->sect;
6245 if (sect->common.flags & SECTION_MERGE)
6248 /* Don't use anchors for small data sections. The small data register
6249 acts as an anchor for such sections. */
6250 if (sect->common.flags & SECTION_SMALL)
6253 decl = SYMBOL_REF_DECL (symbol);
6254 if (decl && DECL_P (decl))
6256 /* Don't use section anchors for decls that might be defined by
6258 if (!targetm.binds_local_p (decl))
6261 /* Don't use section anchors for decls that will be placed in a
6262 small data section. */
6263 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6264 one above. The problem is that we only use SECTION_SMALL for
6265 sections that should be marked as small in the section directive. */
6266 if (targetm.in_small_data_p (decl))
6272 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6273 wrt cross-module name binding. */
6276 default_binds_local_p (const_tree exp)
6278 return default_binds_local_p_1 (exp, flag_shlib);
6282 default_binds_local_p_1 (const_tree exp, int shlib)
6286 /* A non-decl is an entry in the constant pool. */
6289 /* Weakrefs may not bind locally, even though the weakref itself is
6290 always static and therefore local. */
6291 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp)))
6293 /* Static variables are always local. */
6294 else if (! TREE_PUBLIC (exp))
6296 /* A variable is local if the user has said explicitly that it will
6298 else if (DECL_VISIBILITY_SPECIFIED (exp)
6299 && DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
6301 /* Variables defined outside this object might not be local. */
6302 else if (DECL_EXTERNAL (exp))
6304 /* If defined in this object and visibility is not default, must be
6306 else if (DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
6308 /* Default visibility weak data can be overridden by a strong symbol
6309 in another module and so are not local. */
6310 else if (DECL_WEAK (exp))
6312 /* If PIC, then assume that any global name can be overridden by
6313 symbols resolved from other modules, unless we are compiling with
6314 -fwhole-program, which assumes that names are local. */
6316 local_p = flag_whole_program;
6317 /* Uninitialized COMMON variable may be unified with symbols
6318 resolved from other modules. */
6319 else if (DECL_COMMON (exp)
6320 && (DECL_INITIAL (exp) == NULL
6321 || DECL_INITIAL (exp) == error_mark_node))
6323 /* Otherwise we're left with initialized (or non-common) global data
6324 which is of necessity defined locally. */
6331 /* Determine whether or not a pointer mode is valid. Assume defaults
6332 of ptr_mode or Pmode - can be overridden. */
6334 default_valid_pointer_mode (enum machine_mode mode)
6336 return (mode == ptr_mode || mode == Pmode);
6339 /* Default function to output code that will globalize a label. A
6340 target must define GLOBAL_ASM_OP or provide its own function to
6341 globalize a label. */
6342 #ifdef GLOBAL_ASM_OP
6344 default_globalize_label (FILE * stream, const char *name)
6346 fputs (GLOBAL_ASM_OP, stream);
6347 assemble_name (stream, name);
6348 putc ('\n', stream);
6350 #endif /* GLOBAL_ASM_OP */
6352 /* Default function to output code that will globalize a declaration. */
6354 default_globalize_decl_name (FILE * stream, tree decl)
6356 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
6357 targetm.asm_out.globalize_label (stream, name);
6360 /* Default function to output a label for unwind information. The
6361 default is to do nothing. A target that needs nonlocal labels for
6362 unwind information must provide its own function to do this. */
6364 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED,
6365 tree decl ATTRIBUTE_UNUSED,
6366 int for_eh ATTRIBUTE_UNUSED,
6367 int empty ATTRIBUTE_UNUSED)
6371 /* Default function to output a label to divide up the exception table.
6372 The default is to do nothing. A target that needs/wants to divide
6373 up the table must provide it's own function to do this. */
6375 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED)
6379 /* This is how to output an internal numbered label where PREFIX is
6380 the class of label and LABELNO is the number within the class. */
6383 default_internal_label (FILE *stream, const char *prefix,
6384 unsigned long labelno)
6386 char *const buf = (char *) alloca (40 + strlen (prefix));
6387 ASM_GENERATE_INTERNAL_LABEL (buf, prefix, labelno);
6388 ASM_OUTPUT_INTERNAL_LABEL (stream, buf);
6391 /* This is the default behavior at the beginning of a file. It's
6392 controlled by two other target-hook toggles. */
6394 default_file_start (void)
6396 if (targetm.file_start_app_off
6397 && !(flag_verbose_asm || flag_debug_asm || flag_dump_rtl_in_asm))
6398 fputs (ASM_APP_OFF, asm_out_file);
6400 if (targetm.file_start_file_directive)
6401 output_file_directive (asm_out_file, main_input_filename);
6404 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6405 which emits a special section directive used to indicate whether or
6406 not this object file needs an executable stack. This is primarily
6407 a GNU extension to ELF but could be used on other targets. */
6409 int trampolines_created;
6412 file_end_indicate_exec_stack (void)
6414 unsigned int flags = SECTION_DEBUG;
6415 if (trampolines_created)
6416 flags |= SECTION_CODE;
6418 switch_to_section (get_section (".note.GNU-stack", flags, NULL));
6421 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6422 a get_unnamed_section callback. */
6425 output_section_asm_op (const void *directive)
6427 fprintf (asm_out_file, "%s\n", (const char *) directive);
6430 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6431 the current section is NEW_SECTION. */
6434 switch_to_section (section *new_section)
6436 if (in_section == new_section)
6439 if (new_section->common.flags & SECTION_FORGET)
6442 in_section = new_section;
6444 switch (SECTION_STYLE (new_section))
6448 && !crtl->subsections.unlikely_text_section_name
6449 && strcmp (new_section->named.name,
6450 UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
6451 crtl->subsections.unlikely_text_section_name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
6453 targetm.asm_out.named_section (new_section->named.name,
6454 new_section->named.common.flags,
6455 new_section->named.decl);
6458 case SECTION_UNNAMED:
6459 new_section->unnamed.callback (new_section->unnamed.data);
6462 case SECTION_NOSWITCH:
6467 new_section->common.flags |= SECTION_DECLARED;
6470 /* If block symbol SYMBOL has not yet been assigned an offset, place
6471 it at the end of its block. */
6474 place_block_symbol (rtx symbol)
6476 unsigned HOST_WIDE_INT size, mask, offset;
6477 struct constant_descriptor_rtx *desc;
6478 unsigned int alignment;
6479 struct object_block *block;
6482 gcc_assert (SYMBOL_REF_BLOCK (symbol));
6483 if (SYMBOL_REF_BLOCK_OFFSET (symbol) >= 0)
6486 /* Work out the symbol's size and alignment. */
6487 if (CONSTANT_POOL_ADDRESS_P (symbol))
6489 desc = SYMBOL_REF_CONSTANT (symbol);
6490 alignment = desc->align;
6491 size = GET_MODE_SIZE (desc->mode);
6493 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
6495 decl = SYMBOL_REF_DECL (symbol);
6496 alignment = get_constant_alignment (decl);
6497 size = get_constant_size (decl);
6501 decl = SYMBOL_REF_DECL (symbol);
6502 alignment = DECL_ALIGN (decl);
6503 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
6506 /* Calculate the object's offset from the start of the block. */
6507 block = SYMBOL_REF_BLOCK (symbol);
6508 mask = alignment / BITS_PER_UNIT - 1;
6509 offset = (block->size + mask) & ~mask;
6510 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
6512 /* Record the block's new alignment and size. */
6513 block->alignment = MAX (block->alignment, alignment);
6514 block->size = offset + size;
6516 VEC_safe_push (rtx, gc, block->objects, symbol);
6519 /* Return the anchor that should be used to address byte offset OFFSET
6520 from the first object in BLOCK. MODEL is the TLS model used
6524 get_section_anchor (struct object_block *block, HOST_WIDE_INT offset,
6525 enum tls_model model)
6528 unsigned int begin, middle, end;
6529 unsigned HOST_WIDE_INT min_offset, max_offset, range, bias, delta;
6532 /* Work out the anchor's offset. Use an offset of 0 for the first
6533 anchor so that we don't pessimize the case where we take the address
6534 of a variable at the beginning of the block. This is particularly
6535 useful when a block has only one variable assigned to it.
6537 We try to place anchors RANGE bytes apart, so there can then be
6538 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
6539 a ptr_mode offset. With some target settings, the lowest such
6540 anchor might be out of range for the lowest ptr_mode offset;
6541 likewise the highest anchor for the highest offset. Use anchors
6542 at the extreme ends of the ptr_mode range in such cases.
6544 All arithmetic uses unsigned integers in order to avoid
6546 max_offset = (unsigned HOST_WIDE_INT) targetm.max_anchor_offset;
6547 min_offset = (unsigned HOST_WIDE_INT) targetm.min_anchor_offset;
6548 range = max_offset - min_offset + 1;
6553 bias = 1 << (GET_MODE_BITSIZE (ptr_mode) - 1);
6556 delta = -(unsigned HOST_WIDE_INT) offset + max_offset;
6557 delta -= delta % range;
6560 offset = (HOST_WIDE_INT) (-delta);
6564 delta = (unsigned HOST_WIDE_INT) offset - min_offset;
6565 delta -= delta % range;
6566 if (delta > bias - 1)
6568 offset = (HOST_WIDE_INT) delta;
6572 /* Do a binary search to see if there's already an anchor we can use.
6573 Set BEGIN to the new anchor's index if not. */
6575 end = VEC_length (rtx, block->anchors);
6576 while (begin != end)
6578 middle = (end + begin) / 2;
6579 anchor = VEC_index (rtx, block->anchors, middle);
6580 if (SYMBOL_REF_BLOCK_OFFSET (anchor) > offset)
6582 else if (SYMBOL_REF_BLOCK_OFFSET (anchor) < offset)
6584 else if (SYMBOL_REF_TLS_MODEL (anchor) > model)
6586 else if (SYMBOL_REF_TLS_MODEL (anchor) < model)
6592 /* Create a new anchor with a unique label. */
6593 ASM_GENERATE_INTERNAL_LABEL (label, "LANCHOR", anchor_labelno++);
6594 anchor = create_block_symbol (ggc_strdup (label), block, offset);
6595 SYMBOL_REF_FLAGS (anchor) |= SYMBOL_FLAG_LOCAL | SYMBOL_FLAG_ANCHOR;
6596 SYMBOL_REF_FLAGS (anchor) |= model << SYMBOL_FLAG_TLS_SHIFT;
6598 /* Insert it at index BEGIN. */
6599 VEC_safe_insert (rtx, gc, block->anchors, begin, anchor);
6603 /* Output the objects in BLOCK. */
6606 output_object_block (struct object_block *block)
6608 struct constant_descriptor_rtx *desc;
6610 HOST_WIDE_INT offset;
6614 if (block->objects == NULL)
6617 /* Switch to the section and make sure that the first byte is
6618 suitably aligned. */
6619 switch_to_section (block->sect);
6620 assemble_align (block->alignment);
6622 /* Define the values of all anchors relative to the current section
6624 for (i = 0; VEC_iterate (rtx, block->anchors, i, symbol); i++)
6625 targetm.asm_out.output_anchor (symbol);
6627 /* Output the objects themselves. */
6629 for (i = 0; VEC_iterate (rtx, block->objects, i, symbol); i++)
6631 /* Move to the object's offset, padding with zeros if necessary. */
6632 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol) - offset);
6633 offset = SYMBOL_REF_BLOCK_OFFSET (symbol);
6634 if (CONSTANT_POOL_ADDRESS_P (symbol))
6636 desc = SYMBOL_REF_CONSTANT (symbol);
6637 output_constant_pool_1 (desc, 1);
6638 offset += GET_MODE_SIZE (desc->mode);
6640 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
6642 decl = SYMBOL_REF_DECL (symbol);
6643 assemble_constant_contents (decl, XSTR (symbol, 0),
6644 get_constant_alignment (decl));
6645 offset += get_constant_size (decl);
6649 decl = SYMBOL_REF_DECL (symbol);
6650 assemble_variable_contents (decl, XSTR (symbol, 0), false);
6651 offset += tree_low_cst (DECL_SIZE_UNIT (decl), 1);
6656 /* A htab_traverse callback used to call output_object_block for
6657 each member of object_block_htab. */
6660 output_object_block_htab (void **slot, void *data ATTRIBUTE_UNUSED)
6662 output_object_block ((struct object_block *) (*slot));
6666 /* Output the definitions of all object_blocks. */
6669 output_object_blocks (void)
6671 htab_traverse (object_block_htab, output_object_block_htab, NULL);
6674 /* This function provides a possible implementation of the
6675 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
6676 by -frecord-gcc-switches it creates a new mergeable, string section in the
6677 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
6678 contains the switches in ASCII format.
6680 FIXME: This code does not correctly handle double quote characters
6681 that appear inside strings, (it strips them rather than preserving them).
6682 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
6683 characters - instead it treats them as sub-string separators. Since
6684 we want to emit NUL strings terminators into the object file we have to use
6688 elf_record_gcc_switches (print_switch_type type, const char * name)
6690 static char buffer[1024];
6692 /* This variable is used as part of a simplistic heuristic to detect
6693 command line switches which take an argument:
6695 "If a command line option does not start with a dash then
6696 it is an argument for the previous command line option."
6698 This fails in the case of the command line option which is the name
6699 of the file to compile, but otherwise it is pretty reasonable. */
6700 static bool previous_name_held_back = FALSE;
6704 case SWITCH_TYPE_PASSED:
6707 if (previous_name_held_back)
6709 unsigned int len = strlen (buffer);
6711 snprintf (buffer + len, sizeof buffer - len, " %s", name);
6712 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
6713 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
6714 previous_name_held_back = FALSE;
6718 strncpy (buffer, name, sizeof buffer);
6719 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
6720 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
6725 if (previous_name_held_back)
6727 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
6728 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
6731 strncpy (buffer, name, sizeof buffer);
6732 previous_name_held_back = TRUE;
6736 case SWITCH_TYPE_DESCRIPTIVE:
6739 /* Distinguish between invocations where name is NULL. */
6740 static bool started = false;
6744 if (previous_name_held_back)
6746 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
6747 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
6754 sec = get_section (targetm.asm_out.record_gcc_switches_section,
6758 | (SECTION_ENTSIZE & 1),
6760 switch_to_section (sec);
6769 /* The return value is currently ignored by the caller, but must be 0.
6770 For -fverbose-asm the return value would be the number of characters
6771 emitted into the assembler file. */
6775 /* Emit text to declare externally defined symbols. It is needed to
6776 properly support non-default visibility. */
6778 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED,
6780 const char *name ATTRIBUTE_UNUSED)
6782 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
6783 set in order to avoid putting out names that are never really
6785 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
6786 && targetm.binds_local_p (decl))
6787 maybe_assemble_visibility (decl);
6790 #include "gt-varasm.h"