1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997,
3 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
23 /* This file handles generation of all the assembler code
24 *except* the instructions of a function.
25 This includes declarations of variables and their initial values.
27 We also output the assembler code for constants stored in memory
28 and are responsible for combining constants with the same value. */
32 #include "coretypes.h"
39 #include "hard-reg-set.h"
47 #include "langhooks.h"
51 #include "tree-mudflap.h"
53 #include "cfglayout.h"
54 #include "basic-block.h"
55 #include "tree-iterator.h"
57 #ifdef XCOFF_DEBUGGING_INFO
58 #include "xcoffout.h" /* Needed for external data
59 declarations for e.g. AIX 4.x. */
62 /* The (assembler) name of the first globally-visible object output. */
63 extern GTY(()) const char *first_global_object_name;
64 extern GTY(()) const char *weak_global_object_name;
66 const char *first_global_object_name;
67 const char *weak_global_object_name;
70 struct constant_descriptor_rtx;
71 struct rtx_constant_pool;
73 #define n_deferred_constants (crtl->varasm.deferred_constants)
75 /* Number for making the label on the next
76 constant that is stored in memory. */
78 static GTY(()) int const_labelno;
80 /* Carry information from ASM_DECLARE_OBJECT_NAME
81 to ASM_FINISH_DECLARE_OBJECT. */
83 int size_directive_output;
85 /* The last decl for which assemble_variable was called,
86 if it did ASM_DECLARE_OBJECT_NAME.
87 If the last call to assemble_variable didn't do that,
90 tree last_assemble_variable_decl;
92 /* The following global variable indicates if the first basic block
93 in a function belongs to the cold partition or not. */
95 bool first_function_block_is_cold;
97 /* We give all constants their own alias set. Perhaps redundant with
98 MEM_READONLY_P, but pre-dates it. */
100 static alias_set_type const_alias_set;
102 static const char *strip_reg_name (const char *);
103 static int contains_pointers_p (tree);
104 #ifdef ASM_OUTPUT_EXTERNAL
105 static bool incorporeal_function_p (tree);
107 static void decode_addr_const (tree, struct addr_const *);
108 static hashval_t const_desc_hash (const void *);
109 static int const_desc_eq (const void *, const void *);
110 static hashval_t const_hash_1 (const tree);
111 static int compare_constant (const tree, const tree);
112 static tree copy_constant (tree);
113 static void output_constant_def_contents (rtx);
114 static void output_addressed_constants (tree);
115 static unsigned HOST_WIDE_INT array_size_for_constructor (tree);
116 static unsigned min_align (unsigned, unsigned);
117 static void output_constructor (tree, unsigned HOST_WIDE_INT, unsigned int);
118 static void globalize_decl (tree);
119 #ifdef BSS_SECTION_ASM_OP
120 #ifdef ASM_OUTPUT_BSS
121 static void asm_output_bss (FILE *, tree, const char *,
122 unsigned HOST_WIDE_INT, unsigned HOST_WIDE_INT);
124 #ifdef ASM_OUTPUT_ALIGNED_BSS
125 static void asm_output_aligned_bss (FILE *, tree, const char *,
126 unsigned HOST_WIDE_INT, int)
129 #endif /* BSS_SECTION_ASM_OP */
130 static void mark_weak (tree);
131 static void output_constant_pool (const char *, tree);
133 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
134 section *text_section;
135 section *data_section;
136 section *readonly_data_section;
137 section *sdata_section;
138 section *ctors_section;
139 section *dtors_section;
140 section *bss_section;
141 section *sbss_section;
143 /* Various forms of common section. All are guaranteed to be nonnull. */
144 section *tls_comm_section;
145 section *comm_section;
146 section *lcomm_section;
148 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
150 section *bss_noswitch_section;
152 /* The section that holds the main exception table, when known. The section
153 is set either by the target's init_sections hook or by the first call to
154 switch_to_exception_section. */
155 section *exception_section;
157 /* The section that holds the DWARF2 frame unwind information, when known.
158 The section is set either by the target's init_sections hook or by the
159 first call to switch_to_eh_frame_section. */
160 section *eh_frame_section;
162 /* asm_out_file's current section. This is NULL if no section has yet
163 been selected or if we lose track of what the current section is. */
166 /* True if code for the current function is currently being directed
167 at the cold section. */
168 bool in_cold_section_p;
170 /* A linked list of all the unnamed sections. */
171 static GTY(()) section *unnamed_sections;
173 /* Return a nonzero value if DECL has a section attribute. */
174 #ifndef IN_NAMED_SECTION
175 #define IN_NAMED_SECTION(DECL) \
176 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
177 && DECL_SECTION_NAME (DECL) != NULL_TREE)
180 /* Hash table of named sections. */
181 static GTY((param_is (section))) htab_t section_htab;
183 /* A table of object_blocks, indexed by section. */
184 static GTY((param_is (struct object_block))) htab_t object_block_htab;
186 /* The next number to use for internal anchor labels. */
187 static GTY(()) int anchor_labelno;
189 /* A pool of constants that can be shared between functions. */
190 static GTY(()) struct rtx_constant_pool *shared_constant_pool;
194 static GTY ((if_marked ("tree_map_marked_p"), param_is (struct tree_map)))
196 static GTY (()) tree emutls_object_type;
198 #ifndef NO_DOT_IN_LABEL
199 # define EMUTLS_VAR_PREFIX "__emutls_v."
200 # define EMUTLS_TMPL_PREFIX "__emutls_t."
201 #elif !defined NO_DOLLAR_IN_LABEL
202 # define EMUTLS_VAR_PREFIX "__emutls_v$"
203 # define EMUTLS_TMPL_PREFIX "__emutls_t$"
205 # define EMUTLS_VAR_PREFIX "__emutls_v_"
206 # define EMUTLS_TMPL_PREFIX "__emutls_t_"
209 /* Create an identifier for the struct __emutls_object, given an identifier
210 of the DECL_ASSEMBLY_NAME of the original object. */
213 get_emutls_object_name (tree name)
215 char *toname = alloca (strlen (IDENTIFIER_POINTER (name))
216 + sizeof (EMUTLS_VAR_PREFIX));
217 strcpy (toname, EMUTLS_VAR_PREFIX);
218 strcpy (toname + sizeof (EMUTLS_VAR_PREFIX) - 1, IDENTIFIER_POINTER (name));
220 return get_identifier (toname);
223 /* Create the structure for struct __emutls_object. This should match the
224 structure at the top of emutls.c, modulo the union there. */
227 get_emutls_object_type (void)
229 tree type, type_name, field, next_field, word_type_node;
231 type = emutls_object_type;
235 emutls_object_type = type = lang_hooks.types.make_type (RECORD_TYPE);
236 type_name = get_identifier ("__emutls_object");
237 type_name = build_decl (TYPE_DECL, type_name, type);
238 TYPE_NAME (type) = type_name;
240 field = build_decl (FIELD_DECL, get_identifier ("__templ"), ptr_type_node);
241 DECL_CONTEXT (field) = type;
244 field = build_decl (FIELD_DECL, get_identifier ("__offset"), ptr_type_node);
245 DECL_CONTEXT (field) = type;
246 TREE_CHAIN (field) = next_field;
249 word_type_node = lang_hooks.types.type_for_mode (word_mode, 1);
250 field = build_decl (FIELD_DECL, get_identifier ("__align"), word_type_node);
251 DECL_CONTEXT (field) = type;
252 TREE_CHAIN (field) = next_field;
255 field = build_decl (FIELD_DECL, get_identifier ("__size"), word_type_node);
256 DECL_CONTEXT (field) = type;
257 TREE_CHAIN (field) = next_field;
259 TYPE_FIELDS (type) = field;
265 /* Create a read-only variable like DECL, with the same DECL_INITIAL.
266 This will be used for initializing the emulated tls data area. */
269 get_emutls_init_templ_addr (tree decl)
274 if (!DECL_INITIAL (decl))
275 return null_pointer_node;
277 name = DECL_ASSEMBLER_NAME (decl);
278 toname = alloca (strlen (IDENTIFIER_POINTER (name))
279 + sizeof (EMUTLS_TMPL_PREFIX));
280 strcpy (toname, EMUTLS_TMPL_PREFIX);
281 strcpy (toname + sizeof (EMUTLS_TMPL_PREFIX) - 1, IDENTIFIER_POINTER (name));
282 name = get_identifier (toname);
284 to = build_decl (VAR_DECL, name, TREE_TYPE (decl));
285 SET_DECL_ASSEMBLER_NAME (to, DECL_NAME (to));
287 DECL_ARTIFICIAL (to) = 1;
288 TREE_USED (to) = TREE_USED (decl);
289 TREE_READONLY (to) = 1;
290 DECL_IGNORED_P (to) = 1;
291 DECL_CONTEXT (to) = DECL_CONTEXT (decl);
292 DECL_WEAK (to) = DECL_WEAK (decl);
293 if (DECL_ONE_ONLY (decl))
295 make_decl_one_only (to);
296 TREE_STATIC (to) = TREE_STATIC (decl);
297 TREE_PUBLIC (to) = TREE_PUBLIC (decl);
298 DECL_VISIBILITY (to) = DECL_VISIBILITY (decl);
301 TREE_STATIC (to) = 1;
303 DECL_INITIAL (to) = DECL_INITIAL (decl);
304 DECL_INITIAL (decl) = NULL;
306 varpool_finalize_decl (to);
307 return build_fold_addr_expr (to);
310 /* When emulating tls, we use a control structure for use by the runtime.
311 Create and return this structure. */
314 emutls_decl (tree decl)
317 struct tree_map *h, in;
320 if (targetm.have_tls || decl == NULL || decl == error_mark_node
321 || TREE_CODE (decl) != VAR_DECL || ! DECL_THREAD_LOCAL_P (decl))
324 /* Look up the object in the hash; return the control structure if
325 it has already been created. */
327 emutls_htab = htab_create_ggc (512, tree_map_hash, tree_map_eq, 0);
329 name = DECL_ASSEMBLER_NAME (decl);
331 /* Note that we use the hash of the decl's name, rather than a hash
332 of the decl's pointer. In emutls_finish we iterate through the
333 hash table, and we want this traversal to be predictable. */
334 in.hash = htab_hash_string (IDENTIFIER_POINTER (name));
336 loc = htab_find_slot_with_hash (emutls_htab, &in, in.hash, INSERT);
342 to = build_decl (VAR_DECL, get_emutls_object_name (name),
343 get_emutls_object_type ());
345 h = ggc_alloc (sizeof (struct tree_map));
349 *(struct tree_map **) loc = h;
351 DECL_ARTIFICIAL (to) = 1;
352 DECL_IGNORED_P (to) = 1;
353 TREE_READONLY (to) = 0;
355 SET_DECL_ASSEMBLER_NAME (to, DECL_NAME (to));
356 if (DECL_ONE_ONLY (decl))
357 make_decl_one_only (to);
358 DECL_CONTEXT (to) = DECL_CONTEXT (decl);
361 /* Note that these fields may need to be updated from time to time from
362 the original decl. Consider:
363 extern __thread int i;
364 int foo() { return i; }
366 in which I goes from external to locally defined and initialized. */
368 TREE_STATIC (to) = TREE_STATIC (decl);
369 TREE_USED (to) = TREE_USED (decl);
370 TREE_PUBLIC (to) = TREE_PUBLIC (decl);
371 DECL_EXTERNAL (to) = DECL_EXTERNAL (decl);
372 DECL_COMMON (to) = DECL_COMMON (decl);
373 DECL_WEAK (to) = DECL_WEAK (decl);
374 DECL_VISIBILITY (to) = DECL_VISIBILITY (decl);
380 emutls_common_1 (void **loc, void *xstmts)
382 struct tree_map *h = *(struct tree_map **) loc;
383 tree args, x, *pstmts = (tree *) xstmts;
386 if (! DECL_COMMON (h->base.from)
387 || (DECL_INITIAL (h->base.from)
388 && DECL_INITIAL (h->base.from) != error_mark_node))
391 word_type_node = lang_hooks.types.type_for_mode (word_mode, 1);
393 /* The idea was to call get_emutls_init_templ_addr here, but if we
394 do this and there is an initializer, -fanchor_section loses,
395 because it would be too late to ensure the template is
397 x = null_pointer_node;
398 args = tree_cons (NULL, x, NULL);
399 x = build_int_cst (word_type_node, DECL_ALIGN_UNIT (h->base.from));
400 args = tree_cons (NULL, x, args);
401 x = fold_convert (word_type_node, DECL_SIZE_UNIT (h->base.from));
402 args = tree_cons (NULL, x, args);
403 x = build_fold_addr_expr (h->to);
404 args = tree_cons (NULL, x, args);
406 x = built_in_decls[BUILT_IN_EMUTLS_REGISTER_COMMON];
407 x = build_function_call_expr (x, args);
409 append_to_statement_list (x, pstmts);
416 tree body = NULL_TREE;
418 if (emutls_htab == NULL)
421 htab_traverse_noresize (emutls_htab, emutls_common_1, &body);
422 if (body == NULL_TREE)
425 cgraph_build_static_cdtor ('I', body, DEFAULT_INIT_PRIORITY);
428 /* Helper routines for maintaining section_htab. */
431 section_entry_eq (const void *p1, const void *p2)
433 const section *old = p1;
434 const char *new = p2;
436 return strcmp (old->named.name, new) == 0;
440 section_entry_hash (const void *p)
442 const section *old = p;
443 return htab_hash_string (old->named.name);
446 /* Return a hash value for section SECT. */
449 hash_section (section *sect)
451 if (sect->common.flags & SECTION_NAMED)
452 return htab_hash_string (sect->named.name);
453 return sect->common.flags;
456 /* Helper routines for maintaining object_block_htab. */
459 object_block_entry_eq (const void *p1, const void *p2)
461 const struct object_block *old = p1;
462 const section *new = p2;
464 return old->sect == new;
468 object_block_entry_hash (const void *p)
470 const struct object_block *old = p;
471 return hash_section (old->sect);
474 /* Return a new unnamed section with the given fields. */
477 get_unnamed_section (unsigned int flags, void (*callback) (const void *),
482 sect = ggc_alloc (sizeof (struct unnamed_section));
483 sect->unnamed.common.flags = flags | SECTION_UNNAMED;
484 sect->unnamed.callback = callback;
485 sect->unnamed.data = data;
486 sect->unnamed.next = unnamed_sections;
488 unnamed_sections = sect;
492 /* Return a SECTION_NOSWITCH section with the given fields. */
495 get_noswitch_section (unsigned int flags, noswitch_section_callback callback)
499 sect = ggc_alloc (sizeof (struct unnamed_section));
500 sect->noswitch.common.flags = flags | SECTION_NOSWITCH;
501 sect->noswitch.callback = callback;
506 /* Return the named section structure associated with NAME. Create
507 a new section with the given fields if no such structure exists. */
510 get_section (const char *name, unsigned int flags, tree decl)
512 section *sect, **slot;
515 htab_find_slot_with_hash (section_htab, name,
516 htab_hash_string (name), INSERT);
517 flags |= SECTION_NAMED;
520 sect = ggc_alloc (sizeof (struct named_section));
521 sect->named.common.flags = flags;
522 sect->named.name = ggc_strdup (name);
523 sect->named.decl = decl;
529 if ((sect->common.flags & ~SECTION_DECLARED) != flags
530 && ((sect->common.flags | flags) & SECTION_OVERRIDE) == 0)
532 /* Sanity check user variables for flag changes. */
534 decl = sect->named.decl;
536 error ("%+D causes a section type conflict", decl);
542 /* Return true if the current compilation mode benefits from having
543 objects grouped into blocks. */
546 use_object_blocks_p (void)
548 return flag_section_anchors;
551 /* Return the object_block structure for section SECT. Create a new
552 structure if we haven't created one already. Return null if SECT
555 static struct object_block *
556 get_block_for_section (section *sect)
558 struct object_block *block;
564 slot = htab_find_slot_with_hash (object_block_htab, sect,
565 hash_section (sect), INSERT);
566 block = (struct object_block *) *slot;
569 block = (struct object_block *)
570 ggc_alloc_cleared (sizeof (struct object_block));
577 /* Create a symbol with label LABEL and place it at byte offset
578 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
579 is not yet known. LABEL must be a garbage-collected string. */
582 create_block_symbol (const char *label, struct object_block *block,
583 HOST_WIDE_INT offset)
588 /* Create the extended SYMBOL_REF. */
589 size = RTX_HDR_SIZE + sizeof (struct block_symbol);
590 symbol = ggc_alloc_zone (size, &rtl_zone);
592 /* Initialize the normal SYMBOL_REF fields. */
593 memset (symbol, 0, size);
594 PUT_CODE (symbol, SYMBOL_REF);
595 PUT_MODE (symbol, Pmode);
596 XSTR (symbol, 0) = label;
597 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_HAS_BLOCK_INFO;
599 /* Initialize the block_symbol stuff. */
600 SYMBOL_REF_BLOCK (symbol) = block;
601 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
607 initialize_cold_section_name (void)
609 const char *stripped_name;
613 gcc_assert (cfun && current_function_decl);
614 if (crtl->subsections.unlikely_text_section_name)
617 dsn = DECL_SECTION_NAME (current_function_decl);
618 if (flag_function_sections && dsn)
620 name = alloca (TREE_STRING_LENGTH (dsn) + 1);
621 memcpy (name, TREE_STRING_POINTER (dsn), TREE_STRING_LENGTH (dsn) + 1);
623 stripped_name = targetm.strip_name_encoding (name);
625 buffer = ACONCAT ((stripped_name, "_unlikely", NULL));
626 crtl->subsections.unlikely_text_section_name = ggc_strdup (buffer);
629 crtl->subsections.unlikely_text_section_name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
632 /* Tell assembler to switch to unlikely-to-be-executed text section. */
635 unlikely_text_section (void)
639 if (!crtl->subsections.unlikely_text_section_name)
640 initialize_cold_section_name ();
642 return get_named_section (NULL, crtl->subsections.unlikely_text_section_name, 0);
645 return get_named_section (NULL, UNLIKELY_EXECUTED_TEXT_SECTION_NAME, 0);
648 /* When called within a function context, return true if the function
649 has been assigned a cold text section and if SECT is that section.
650 When called outside a function context, return true if SECT is the
651 default cold section. */
654 unlikely_text_section_p (section *sect)
659 name = crtl->subsections.unlikely_text_section_name;
661 name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
665 && SECTION_STYLE (sect) == SECTION_NAMED
666 && strcmp (name, sect->named.name) == 0);
669 /* Return a section with a particular name and with whatever SECTION_*
670 flags section_type_flags deems appropriate. The name of the section
671 is taken from NAME if nonnull, otherwise it is taken from DECL's
672 DECL_SECTION_NAME. DECL is the decl associated with the section
673 (see the section comment for details) and RELOC is as for
674 section_type_flags. */
677 get_named_section (tree decl, const char *name, int reloc)
681 gcc_assert (!decl || DECL_P (decl));
683 name = TREE_STRING_POINTER (DECL_SECTION_NAME (decl));
685 flags = targetm.section_type_flags (decl, name, reloc);
687 return get_section (name, flags, decl);
690 /* If required, set DECL_SECTION_NAME to a unique name. */
693 resolve_unique_section (tree decl, int reloc ATTRIBUTE_UNUSED,
694 int flag_function_or_data_sections)
696 if (DECL_SECTION_NAME (decl) == NULL_TREE
697 && targetm.have_named_sections
698 && (flag_function_or_data_sections
699 || DECL_ONE_ONLY (decl)))
700 targetm.asm_out.unique_section (decl, reloc);
703 #ifdef BSS_SECTION_ASM_OP
705 #ifdef ASM_OUTPUT_BSS
707 /* Utility function for ASM_OUTPUT_BSS for targets to use if
708 they don't support alignments in .bss.
709 ??? It is believed that this function will work in most cases so such
710 support is localized here. */
713 asm_output_bss (FILE *file, tree decl ATTRIBUTE_UNUSED,
715 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
716 unsigned HOST_WIDE_INT rounded)
718 gcc_assert (strcmp (XSTR (XEXP (DECL_RTL (decl), 0), 0), name) == 0);
719 targetm.asm_out.globalize_decl_name (file, decl);
720 switch_to_section (bss_section);
721 #ifdef ASM_DECLARE_OBJECT_NAME
722 last_assemble_variable_decl = decl;
723 ASM_DECLARE_OBJECT_NAME (file, name, decl);
725 /* Standard thing is just output label for the object. */
726 ASM_OUTPUT_LABEL (file, name);
727 #endif /* ASM_DECLARE_OBJECT_NAME */
728 ASM_OUTPUT_SKIP (file, rounded ? rounded : 1);
733 #ifdef ASM_OUTPUT_ALIGNED_BSS
735 /* Utility function for targets to use in implementing
736 ASM_OUTPUT_ALIGNED_BSS.
737 ??? It is believed that this function will work in most cases so such
738 support is localized here. */
741 asm_output_aligned_bss (FILE *file, tree decl ATTRIBUTE_UNUSED,
742 const char *name, unsigned HOST_WIDE_INT size,
745 switch_to_section (bss_section);
746 ASM_OUTPUT_ALIGN (file, floor_log2 (align / BITS_PER_UNIT));
747 #ifdef ASM_DECLARE_OBJECT_NAME
748 last_assemble_variable_decl = decl;
749 ASM_DECLARE_OBJECT_NAME (file, name, decl);
751 /* Standard thing is just output label for the object. */
752 ASM_OUTPUT_LABEL (file, name);
753 #endif /* ASM_DECLARE_OBJECT_NAME */
754 ASM_OUTPUT_SKIP (file, size ? size : 1);
759 #endif /* BSS_SECTION_ASM_OP */
761 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
762 /* Return the hot section for function DECL. Return text_section for
766 hot_function_section (tree decl)
768 if (decl != NULL_TREE
769 && DECL_SECTION_NAME (decl) != NULL_TREE
770 && targetm.have_named_sections)
771 return get_named_section (decl, NULL, 0);
777 /* Return the section for function DECL.
779 If DECL is NULL_TREE, return the text section. We can be passed
780 NULL_TREE under some circumstances by dbxout.c at least. */
783 function_section (tree decl)
787 if (first_function_block_is_cold)
790 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
791 if (decl != NULL_TREE
792 && DECL_SECTION_NAME (decl) != NULL_TREE)
793 return reloc ? unlikely_text_section ()
794 : get_named_section (decl, NULL, 0);
796 return targetm.asm_out.select_section (decl, reloc, DECL_ALIGN (decl));
798 return reloc ? unlikely_text_section () : hot_function_section (decl);
803 current_function_section (void)
805 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
806 if (current_function_decl != NULL_TREE
807 && DECL_SECTION_NAME (current_function_decl) != NULL_TREE)
808 return in_cold_section_p ? unlikely_text_section ()
809 : get_named_section (current_function_decl,
812 return targetm.asm_out.select_section (current_function_decl,
814 DECL_ALIGN (current_function_decl));
816 return (in_cold_section_p
817 ? unlikely_text_section ()
818 : hot_function_section (current_function_decl));
822 /* Return the read-only data section associated with function DECL. */
825 default_function_rodata_section (tree decl)
827 if (decl != NULL_TREE && DECL_SECTION_NAME (decl))
829 const char *name = TREE_STRING_POINTER (DECL_SECTION_NAME (decl));
831 if (DECL_ONE_ONLY (decl) && HAVE_COMDAT_GROUP)
833 size_t len = strlen (name) + 3;
834 char* rname = alloca (len);
836 strcpy (rname, ".rodata");
837 strcat (rname, name + 5);
838 return get_section (rname, SECTION_LINKONCE, decl);
840 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
841 else if (DECL_ONE_ONLY (decl)
842 && strncmp (name, ".gnu.linkonce.t.", 16) == 0)
844 size_t len = strlen (name) + 1;
845 char *rname = alloca (len);
847 memcpy (rname, name, len);
849 return get_section (rname, SECTION_LINKONCE, decl);
851 /* For .text.foo we want to use .rodata.foo. */
852 else if (flag_function_sections && flag_data_sections
853 && strncmp (name, ".text.", 6) == 0)
855 size_t len = strlen (name) + 1;
856 char *rname = alloca (len + 2);
858 memcpy (rname, ".rodata", 7);
859 memcpy (rname + 7, name + 5, len - 5);
860 return get_section (rname, 0, decl);
864 return readonly_data_section;
867 /* Return the read-only data section associated with function DECL
868 for targets where that section should be always the single
869 readonly data section. */
872 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED)
874 return readonly_data_section;
877 /* Return the section to use for string merging. */
880 mergeable_string_section (tree decl ATTRIBUTE_UNUSED,
881 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
882 unsigned int flags ATTRIBUTE_UNUSED)
886 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
887 && TREE_CODE (decl) == STRING_CST
888 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
890 && (len = int_size_in_bytes (TREE_TYPE (decl))) > 0
891 && TREE_STRING_LENGTH (decl) >= len)
893 enum machine_mode mode;
894 unsigned int modesize;
900 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (decl)));
901 modesize = GET_MODE_BITSIZE (mode);
902 if (modesize >= 8 && modesize <= 256
903 && (modesize & (modesize - 1)) == 0)
905 if (align < modesize)
908 str = TREE_STRING_POINTER (decl);
909 unit = GET_MODE_SIZE (mode);
911 /* Check for embedded NUL characters. */
912 for (i = 0; i < len; i += unit)
914 for (j = 0; j < unit; j++)
915 if (str[i + j] != '\0')
922 sprintf (name, ".rodata.str%d.%d", modesize / 8,
924 flags |= (modesize / 8) | SECTION_MERGE | SECTION_STRINGS;
925 return get_section (name, flags, NULL);
930 return readonly_data_section;
933 /* Return the section to use for constant merging. */
936 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED,
937 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
938 unsigned int flags ATTRIBUTE_UNUSED)
940 unsigned int modesize = GET_MODE_BITSIZE (mode);
942 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
948 && (align & (align - 1)) == 0)
952 sprintf (name, ".rodata.cst%d", (int) (align / 8));
953 flags |= (align / 8) | SECTION_MERGE;
954 return get_section (name, flags, NULL);
956 return readonly_data_section;
959 /* Given NAME, a putative register name, discard any customary prefixes. */
962 strip_reg_name (const char *name)
964 #ifdef REGISTER_PREFIX
965 if (!strncmp (name, REGISTER_PREFIX, strlen (REGISTER_PREFIX)))
966 name += strlen (REGISTER_PREFIX);
968 if (name[0] == '%' || name[0] == '#')
973 /* The user has asked for a DECL to have a particular name. Set (or
974 change) it in such a way that we don't prefix an underscore to
977 set_user_assembler_name (tree decl, const char *name)
979 char *starred = alloca (strlen (name) + 2);
981 strcpy (starred + 1, name);
982 change_decl_assembler_name (decl, get_identifier (starred));
983 SET_DECL_RTL (decl, NULL_RTX);
986 /* Decode an `asm' spec for a declaration as a register name.
987 Return the register number, or -1 if nothing specified,
988 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
989 or -3 if ASMSPEC is `cc' and is not recognized,
990 or -4 if ASMSPEC is `memory' and is not recognized.
991 Accept an exact spelling or a decimal number.
992 Prefixes such as % are optional. */
995 decode_reg_name (const char *asmspec)
1001 /* Get rid of confusing prefixes. */
1002 asmspec = strip_reg_name (asmspec);
1004 /* Allow a decimal number as a "register name". */
1005 for (i = strlen (asmspec) - 1; i >= 0; i--)
1006 if (! ISDIGIT (asmspec[i]))
1008 if (asmspec[0] != 0 && i < 0)
1011 if (i < FIRST_PSEUDO_REGISTER && i >= 0)
1017 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
1019 && ! strcmp (asmspec, strip_reg_name (reg_names[i])))
1022 #ifdef ADDITIONAL_REGISTER_NAMES
1024 static const struct { const char *const name; const int number; } table[]
1025 = ADDITIONAL_REGISTER_NAMES;
1027 for (i = 0; i < (int) ARRAY_SIZE (table); i++)
1028 if (table[i].name[0]
1029 && ! strcmp (asmspec, table[i].name))
1030 return table[i].number;
1032 #endif /* ADDITIONAL_REGISTER_NAMES */
1034 if (!strcmp (asmspec, "memory"))
1037 if (!strcmp (asmspec, "cc"))
1046 /* Return true if DECL's initializer is suitable for a BSS section. */
1049 bss_initializer_p (const_tree decl)
1051 return (DECL_INITIAL (decl) == NULL
1052 || DECL_INITIAL (decl) == error_mark_node
1053 || (flag_zero_initialized_in_bss
1054 /* Leave constant zeroes in .rodata so they
1056 && !TREE_READONLY (decl)
1057 && initializer_zerop (DECL_INITIAL (decl))));
1060 /* Compute the alignment of variable specified by DECL.
1061 DONT_OUTPUT_DATA is from assemble_variable. */
1064 align_variable (tree decl, bool dont_output_data)
1066 unsigned int align = DECL_ALIGN (decl);
1068 /* In the case for initialing an array whose length isn't specified,
1069 where we have not yet been able to do the layout,
1070 figure out the proper alignment now. */
1071 if (dont_output_data && DECL_SIZE (decl) == 0
1072 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
1073 align = MAX (align, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl))));
1075 /* Some object file formats have a maximum alignment which they support.
1076 In particular, a.out format supports a maximum alignment of 4. */
1077 if (align > MAX_OFILE_ALIGNMENT)
1079 warning (0, "alignment of %q+D is greater than maximum object "
1080 "file alignment. Using %d", decl,
1081 MAX_OFILE_ALIGNMENT/BITS_PER_UNIT);
1082 align = MAX_OFILE_ALIGNMENT;
1085 /* On some machines, it is good to increase alignment sometimes. */
1086 if (! DECL_USER_ALIGN (decl))
1088 #ifdef DATA_ALIGNMENT
1089 unsigned int data_align = DATA_ALIGNMENT (TREE_TYPE (decl), align);
1090 /* Don't increase alignment too much for TLS variables - TLS space
1092 if (! DECL_THREAD_LOCAL_P (decl) || data_align <= BITS_PER_WORD)
1095 #ifdef CONSTANT_ALIGNMENT
1096 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
1098 unsigned int const_align = CONSTANT_ALIGNMENT (DECL_INITIAL (decl),
1100 /* Don't increase alignment too much for TLS variables - TLS space
1102 if (! DECL_THREAD_LOCAL_P (decl) || const_align <= BITS_PER_WORD)
1103 align = const_align;
1108 /* Reset the alignment in case we have made it tighter, so we can benefit
1109 from it in get_pointer_alignment. */
1110 DECL_ALIGN (decl) = align;
1113 /* Return the section into which the given VAR_DECL or CONST_DECL
1114 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1115 section should be used wherever possible. */
1118 get_variable_section (tree decl, bool prefer_noswitch_p)
1122 /* If the decl has been given an explicit section name, then it
1123 isn't common, and shouldn't be handled as such. */
1124 if (DECL_COMMON (decl) && DECL_SECTION_NAME (decl) == NULL)
1126 if (DECL_THREAD_LOCAL_P (decl))
1127 return tls_comm_section;
1128 if (TREE_PUBLIC (decl) && bss_initializer_p (decl))
1129 return comm_section;
1132 if (DECL_INITIAL (decl) == error_mark_node)
1133 reloc = contains_pointers_p (TREE_TYPE (decl)) ? 3 : 0;
1134 else if (DECL_INITIAL (decl))
1135 reloc = compute_reloc_for_constant (DECL_INITIAL (decl));
1139 resolve_unique_section (decl, reloc, flag_data_sections);
1140 if (IN_NAMED_SECTION (decl))
1141 return get_named_section (decl, NULL, reloc);
1143 if (!DECL_THREAD_LOCAL_P (decl)
1144 && !(prefer_noswitch_p && targetm.have_switchable_bss_sections)
1145 && bss_initializer_p (decl))
1147 if (!TREE_PUBLIC (decl))
1148 return lcomm_section;
1149 if (bss_noswitch_section)
1150 return bss_noswitch_section;
1153 return targetm.asm_out.select_section (decl, reloc, DECL_ALIGN (decl));
1156 /* Return the block into which object_block DECL should be placed. */
1158 static struct object_block *
1159 get_block_for_decl (tree decl)
1163 if (TREE_CODE (decl) == VAR_DECL)
1165 /* The object must be defined in this translation unit. */
1166 if (DECL_EXTERNAL (decl))
1169 /* There's no point using object blocks for something that is
1170 isolated by definition. */
1171 if (DECL_ONE_ONLY (decl))
1175 /* We can only calculate block offsets if the decl has a known
1177 if (DECL_SIZE_UNIT (decl) == NULL)
1179 if (!host_integerp (DECL_SIZE_UNIT (decl), 1))
1182 /* Find out which section should contain DECL. We cannot put it into
1183 an object block if it requires a standalone definition. */
1184 if (TREE_CODE (decl) == VAR_DECL)
1185 align_variable (decl, 0);
1186 sect = get_variable_section (decl, true);
1187 if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
1190 return get_block_for_section (sect);
1193 /* Make sure block symbol SYMBOL is in block BLOCK. */
1196 change_symbol_block (rtx symbol, struct object_block *block)
1198 if (block != SYMBOL_REF_BLOCK (symbol))
1200 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol) < 0);
1201 SYMBOL_REF_BLOCK (symbol) = block;
1205 /* Return true if it is possible to put DECL in an object_block. */
1208 use_blocks_for_decl_p (tree decl)
1210 /* Only data DECLs can be placed into object blocks. */
1211 if (TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != CONST_DECL)
1214 /* Detect decls created by dw2_force_const_mem. Such decls are
1215 special because DECL_INITIAL doesn't specify the decl's true value.
1216 dw2_output_indirect_constants will instead call assemble_variable
1217 with dont_output_data set to 1 and then print the contents itself. */
1218 if (DECL_INITIAL (decl) == decl)
1221 /* If this decl is an alias, then we don't want to emit a definition. */
1222 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl)))
1228 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1229 have static storage duration. In other words, it should not be an
1230 automatic variable, including PARM_DECLs.
1232 There is, however, one exception: this function handles variables
1233 explicitly placed in a particular register by the user.
1235 This is never called for PARM_DECL nodes. */
1238 make_decl_rtl (tree decl)
1240 const char *name = 0;
1244 /* Check that we are not being given an automatic variable. */
1245 gcc_assert (TREE_CODE (decl) != PARM_DECL
1246 && TREE_CODE (decl) != RESULT_DECL);
1248 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1249 gcc_assert (TREE_CODE (decl) != VAR_DECL
1250 || TREE_STATIC (decl)
1251 || TREE_PUBLIC (decl)
1252 || DECL_EXTERNAL (decl)
1253 || DECL_REGISTER (decl));
1255 /* And that we were not given a type or a label. */
1256 gcc_assert (TREE_CODE (decl) != TYPE_DECL
1257 && TREE_CODE (decl) != LABEL_DECL);
1259 /* For a duplicate declaration, we can be called twice on the
1260 same DECL node. Don't discard the RTL already made. */
1261 if (DECL_RTL_SET_P (decl))
1263 /* If the old RTL had the wrong mode, fix the mode. */
1264 x = DECL_RTL (decl);
1265 if (GET_MODE (x) != DECL_MODE (decl))
1266 SET_DECL_RTL (decl, adjust_address_nv (x, DECL_MODE (decl), 0));
1268 if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1271 /* ??? Another way to do this would be to maintain a hashed
1272 table of such critters. Instead of adding stuff to a DECL
1273 to give certain attributes to it, we could use an external
1274 hash map from DECL to set of attributes. */
1276 /* Let the target reassign the RTL if it wants.
1277 This is necessary, for example, when one machine specific
1278 decl attribute overrides another. */
1279 targetm.encode_section_info (decl, DECL_RTL (decl), false);
1281 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1282 on the new decl information. */
1284 && GET_CODE (XEXP (x, 0)) == SYMBOL_REF
1285 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x, 0)))
1286 change_symbol_block (XEXP (x, 0), get_block_for_decl (decl));
1288 /* Make this function static known to the mudflap runtime. */
1289 if (flag_mudflap && TREE_CODE (decl) == VAR_DECL)
1290 mudflap_enqueue_decl (decl);
1295 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
1297 if (name[0] != '*' && TREE_CODE (decl) != FUNCTION_DECL
1298 && DECL_REGISTER (decl))
1300 error ("register name not specified for %q+D", decl);
1302 else if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1304 const char *asmspec = name+1;
1305 reg_number = decode_reg_name (asmspec);
1306 /* First detect errors in declaring global registers. */
1307 if (reg_number == -1)
1308 error ("register name not specified for %q+D", decl);
1309 else if (reg_number < 0)
1310 error ("invalid register name for %q+D", decl);
1311 else if (TYPE_MODE (TREE_TYPE (decl)) == BLKmode)
1312 error ("data type of %q+D isn%'t suitable for a register",
1314 else if (! HARD_REGNO_MODE_OK (reg_number, TYPE_MODE (TREE_TYPE (decl))))
1315 error ("register specified for %q+D isn%'t suitable for data type",
1317 /* Now handle properly declared static register variables. */
1322 if (DECL_INITIAL (decl) != 0 && TREE_STATIC (decl))
1324 DECL_INITIAL (decl) = 0;
1325 error ("global register variable has initial value");
1327 if (TREE_THIS_VOLATILE (decl))
1328 warning (OPT_Wvolatile_register_var,
1329 "optimization may eliminate reads and/or "
1330 "writes to register variables");
1332 /* If the user specified one of the eliminables registers here,
1333 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1334 confused with that register and be eliminated. This usage is
1335 somewhat suspect... */
1337 SET_DECL_RTL (decl, gen_rtx_raw_REG (DECL_MODE (decl), reg_number));
1338 ORIGINAL_REGNO (DECL_RTL (decl)) = reg_number;
1339 REG_USERVAR_P (DECL_RTL (decl)) = 1;
1341 if (TREE_STATIC (decl))
1343 /* Make this register global, so not usable for anything
1345 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1346 name = IDENTIFIER_POINTER (DECL_NAME (decl));
1347 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file, decl, reg_number, name);
1349 nregs = hard_regno_nregs[reg_number][DECL_MODE (decl)];
1351 globalize_reg (reg_number + --nregs);
1354 /* As a register variable, it has no section. */
1358 /* Now handle ordinary static variables and functions (in memory).
1359 Also handle vars declared register invalidly. */
1360 else if (name[0] == '*')
1362 #ifdef REGISTER_PREFIX
1363 if (strlen (REGISTER_PREFIX) != 0)
1365 reg_number = decode_reg_name (name);
1366 if (reg_number >= 0 || reg_number == -3)
1367 error ("register name given for non-register variable %q+D", decl);
1372 /* Specifying a section attribute on a variable forces it into a
1373 non-.bss section, and thus it cannot be common. */
1374 if (TREE_CODE (decl) == VAR_DECL
1375 && DECL_SECTION_NAME (decl) != NULL_TREE
1376 && DECL_INITIAL (decl) == NULL_TREE
1377 && DECL_COMMON (decl))
1378 DECL_COMMON (decl) = 0;
1380 /* Variables can't be both common and weak. */
1381 if (TREE_CODE (decl) == VAR_DECL && DECL_WEAK (decl))
1382 DECL_COMMON (decl) = 0;
1384 if (use_object_blocks_p () && use_blocks_for_decl_p (decl))
1385 x = create_block_symbol (name, get_block_for_decl (decl), -1);
1387 x = gen_rtx_SYMBOL_REF (Pmode, name);
1388 SYMBOL_REF_WEAK (x) = DECL_WEAK (decl);
1389 SET_SYMBOL_REF_DECL (x, decl);
1391 x = gen_rtx_MEM (DECL_MODE (decl), x);
1392 if (TREE_CODE (decl) != FUNCTION_DECL)
1393 set_mem_attributes (x, decl, 1);
1394 SET_DECL_RTL (decl, x);
1396 /* Optionally set flags or add text to the name to record information
1397 such as that it is a function name.
1398 If the name is changed, the macro ASM_OUTPUT_LABELREF
1399 will have to know how to strip this information. */
1400 targetm.encode_section_info (decl, DECL_RTL (decl), true);
1402 /* Make this function static known to the mudflap runtime. */
1403 if (flag_mudflap && TREE_CODE (decl) == VAR_DECL)
1404 mudflap_enqueue_decl (decl);
1407 /* Output a string of literal assembler code
1408 for an `asm' keyword used between functions. */
1411 assemble_asm (tree string)
1415 if (TREE_CODE (string) == ADDR_EXPR)
1416 string = TREE_OPERAND (string, 0);
1418 fprintf (asm_out_file, "\t%s\n", TREE_STRING_POINTER (string));
1421 /* Record an element in the table of global destructors. SYMBOL is
1422 a SYMBOL_REF of the function to be called; PRIORITY is a number
1423 between 0 and MAX_INIT_PRIORITY. */
1426 default_stabs_asm_out_destructor (rtx symbol ATTRIBUTE_UNUSED,
1427 int priority ATTRIBUTE_UNUSED)
1429 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1430 /* Tell GNU LD that this is part of the static destructor set.
1431 This will work for any system that uses stabs, most usefully
1433 dbxout_begin_simple_stabs ("___DTOR_LIST__", 22 /* N_SETT */);
1434 dbxout_stab_value_label (XSTR (symbol, 0));
1436 sorry ("global destructors not supported on this target");
1440 /* Write the address of the entity given by SYMBOL to SEC. */
1442 assemble_addr_to_section (rtx symbol, section *sec)
1444 switch_to_section (sec);
1445 assemble_align (POINTER_SIZE);
1446 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1449 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1450 not) section for PRIORITY. */
1452 get_cdtor_priority_section (int priority, bool constructor_p)
1456 /* ??? This only works reliably with the GNU linker. */
1457 sprintf (buf, "%s.%.5u",
1458 constructor_p ? ".ctors" : ".dtors",
1459 /* Invert the numbering so the linker puts us in the proper
1460 order; constructors are run from right to left, and the
1461 linker sorts in increasing order. */
1462 MAX_INIT_PRIORITY - priority);
1463 return get_section (buf, SECTION_WRITE, NULL);
1467 default_named_section_asm_out_destructor (rtx symbol, int priority)
1471 if (priority != DEFAULT_INIT_PRIORITY)
1472 sec = get_cdtor_priority_section (priority,
1473 /*constructor_p=*/false);
1475 sec = get_section (".dtors", SECTION_WRITE, NULL);
1477 assemble_addr_to_section (symbol, sec);
1480 #ifdef DTORS_SECTION_ASM_OP
1482 default_dtor_section_asm_out_destructor (rtx symbol,
1483 int priority ATTRIBUTE_UNUSED)
1485 assemble_addr_to_section (symbol, dtors_section);
1489 /* Likewise for global constructors. */
1492 default_stabs_asm_out_constructor (rtx symbol ATTRIBUTE_UNUSED,
1493 int priority ATTRIBUTE_UNUSED)
1495 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1496 /* Tell GNU LD that this is part of the static destructor set.
1497 This will work for any system that uses stabs, most usefully
1499 dbxout_begin_simple_stabs ("___CTOR_LIST__", 22 /* N_SETT */);
1500 dbxout_stab_value_label (XSTR (symbol, 0));
1502 sorry ("global constructors not supported on this target");
1507 default_named_section_asm_out_constructor (rtx symbol, int priority)
1511 if (priority != DEFAULT_INIT_PRIORITY)
1512 sec = get_cdtor_priority_section (priority,
1513 /*constructor_p=*/true);
1515 sec = get_section (".ctors", SECTION_WRITE, NULL);
1517 assemble_addr_to_section (symbol, sec);
1520 #ifdef CTORS_SECTION_ASM_OP
1522 default_ctor_section_asm_out_constructor (rtx symbol,
1523 int priority ATTRIBUTE_UNUSED)
1525 assemble_addr_to_section (symbol, ctors_section);
1529 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1530 a nonzero value if the constant pool should be output before the
1531 start of the function, or a zero value if the pool should output
1532 after the end of the function. The default is to put it before the
1535 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1536 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1539 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1540 to be output to assembler.
1541 Set first_global_object_name and weak_global_object_name as appropriate. */
1544 notice_global_symbol (tree decl)
1546 const char **type = &first_global_object_name;
1548 if (first_global_object_name
1549 || !TREE_PUBLIC (decl)
1550 || DECL_EXTERNAL (decl)
1551 || !DECL_NAME (decl)
1552 || (TREE_CODE (decl) != FUNCTION_DECL
1553 && (TREE_CODE (decl) != VAR_DECL
1554 || (DECL_COMMON (decl)
1555 && (DECL_INITIAL (decl) == 0
1556 || DECL_INITIAL (decl) == error_mark_node))))
1557 || !MEM_P (DECL_RTL (decl)))
1560 /* We win when global object is found, but it is useful to know about weak
1561 symbol as well so we can produce nicer unique names. */
1562 if (DECL_WEAK (decl) || DECL_ONE_ONLY (decl) || flag_shlib)
1563 type = &weak_global_object_name;
1569 rtx decl_rtl = DECL_RTL (decl);
1571 p = targetm.strip_name_encoding (XSTR (XEXP (decl_rtl, 0), 0));
1572 name = ggc_strdup (p);
1578 /* Output assembler code for the constant pool of a function and associated
1579 with defining the name of the function. DECL describes the function.
1580 NAME is the function's name. For the constant pool, we use the current
1581 constant pool data. */
1584 assemble_start_function (tree decl, const char *fnname)
1587 char tmp_label[100];
1588 bool hot_label_written = false;
1590 crtl->subsections.unlikely_text_section_name = NULL;
1592 first_function_block_is_cold = false;
1593 if (flag_reorder_blocks_and_partition)
1595 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTB", const_labelno);
1596 crtl->subsections.hot_section_label = ggc_strdup (tmp_label);
1597 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDB", const_labelno);
1598 crtl->subsections.cold_section_label = ggc_strdup (tmp_label);
1599 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTE", const_labelno);
1600 crtl->subsections.hot_section_end_label = ggc_strdup (tmp_label);
1601 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDE", const_labelno);
1602 crtl->subsections.cold_section_end_label = ggc_strdup (tmp_label);
1607 crtl->subsections.hot_section_label = NULL;
1608 crtl->subsections.cold_section_label = NULL;
1609 crtl->subsections.hot_section_end_label = NULL;
1610 crtl->subsections.cold_section_end_label = NULL;
1613 /* The following code does not need preprocessing in the assembler. */
1617 if (CONSTANT_POOL_BEFORE_FUNCTION)
1618 output_constant_pool (fnname, decl);
1620 resolve_unique_section (decl, 0, flag_function_sections);
1622 /* Make sure the not and cold text (code) sections are properly
1623 aligned. This is necessary here in the case where the function
1624 has both hot and cold sections, because we don't want to re-set
1625 the alignment when the section switch happens mid-function. */
1627 if (flag_reorder_blocks_and_partition)
1629 switch_to_section (unlikely_text_section ());
1630 assemble_align (DECL_ALIGN (decl));
1631 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.cold_section_label);
1633 /* When the function starts with a cold section, we need to explicitly
1634 align the hot section and write out the hot section label.
1635 But if the current function is a thunk, we do not have a CFG. */
1636 if (!current_function_is_thunk
1637 && BB_PARTITION (ENTRY_BLOCK_PTR->next_bb) == BB_COLD_PARTITION)
1639 switch_to_section (text_section);
1640 assemble_align (DECL_ALIGN (decl));
1641 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_label);
1642 hot_label_written = true;
1643 first_function_block_is_cold = true;
1646 else if (DECL_SECTION_NAME (decl))
1648 /* Calls to function_section rely on first_function_block_is_cold
1649 being accurate. The first block may be cold even if we aren't
1650 doing partitioning, if the entire function was decided by
1651 choose_function_section (predict.c) to be cold. */
1653 initialize_cold_section_name ();
1655 if (crtl->subsections.unlikely_text_section_name
1656 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)),
1657 crtl->subsections.unlikely_text_section_name) == 0)
1658 first_function_block_is_cold = true;
1661 in_cold_section_p = first_function_block_is_cold;
1663 /* Switch to the correct text section for the start of the function. */
1665 switch_to_section (function_section (decl));
1666 if (flag_reorder_blocks_and_partition
1667 && !hot_label_written)
1668 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_label);
1670 /* Tell assembler to move to target machine's alignment for functions. */
1671 align = floor_log2 (DECL_ALIGN (decl) / BITS_PER_UNIT);
1674 ASM_OUTPUT_ALIGN (asm_out_file, align);
1677 /* Handle a user-specified function alignment.
1678 Note that we still need to align to DECL_ALIGN, as above,
1679 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1680 if (! DECL_USER_ALIGN (decl)
1681 && align_functions_log > align
1682 && cfun->function_frequency != FUNCTION_FREQUENCY_UNLIKELY_EXECUTED)
1684 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1685 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file,
1686 align_functions_log, align_functions - 1);
1688 ASM_OUTPUT_ALIGN (asm_out_file, align_functions_log);
1692 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1693 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file, fnname);
1696 (*debug_hooks->begin_function) (decl);
1698 /* Make function name accessible from other files, if appropriate. */
1700 if (TREE_PUBLIC (decl))
1702 notice_global_symbol (decl);
1704 globalize_decl (decl);
1706 maybe_assemble_visibility (decl);
1709 if (DECL_PRESERVE_P (decl))
1710 targetm.asm_out.mark_decl_preserved (fnname);
1712 /* Do any machine/system dependent processing of the function name. */
1713 #ifdef ASM_DECLARE_FUNCTION_NAME
1714 ASM_DECLARE_FUNCTION_NAME (asm_out_file, fnname, current_function_decl);
1716 /* Standard thing is just output label for the function. */
1717 ASM_OUTPUT_LABEL (asm_out_file, fnname);
1718 #endif /* ASM_DECLARE_FUNCTION_NAME */
1721 /* Output assembler code associated with defining the size of the
1722 function. DECL describes the function. NAME is the function's name. */
1725 assemble_end_function (tree decl, const char *fnname ATTRIBUTE_UNUSED)
1727 #ifdef ASM_DECLARE_FUNCTION_SIZE
1728 /* We could have switched section in the middle of the function. */
1729 if (flag_reorder_blocks_and_partition)
1730 switch_to_section (function_section (decl));
1731 ASM_DECLARE_FUNCTION_SIZE (asm_out_file, fnname, decl);
1733 if (! CONSTANT_POOL_BEFORE_FUNCTION)
1735 output_constant_pool (fnname, decl);
1736 switch_to_section (function_section (decl)); /* need to switch back */
1738 /* Output labels for end of hot/cold text sections (to be used by
1740 if (flag_reorder_blocks_and_partition)
1742 section *save_text_section;
1744 save_text_section = in_section;
1745 switch_to_section (unlikely_text_section ());
1746 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.cold_section_end_label);
1747 if (first_function_block_is_cold)
1748 switch_to_section (text_section);
1750 switch_to_section (function_section (decl));
1751 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_end_label);
1752 switch_to_section (save_text_section);
1756 /* Assemble code to leave SIZE bytes of zeros. */
1759 assemble_zeros (unsigned HOST_WIDE_INT size)
1761 /* Do no output if -fsyntax-only. */
1762 if (flag_syntax_only)
1765 #ifdef ASM_NO_SKIP_IN_TEXT
1766 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1767 so we must output 0s explicitly in the text section. */
1768 if (ASM_NO_SKIP_IN_TEXT && (in_section->common.flags & SECTION_CODE) != 0)
1770 unsigned HOST_WIDE_INT i;
1771 for (i = 0; i < size; i++)
1772 assemble_integer (const0_rtx, 1, BITS_PER_UNIT, 1);
1777 ASM_OUTPUT_SKIP (asm_out_file, size);
1780 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1783 assemble_align (int align)
1785 if (align > BITS_PER_UNIT)
1787 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
1791 /* Assemble a string constant with the specified C string as contents. */
1794 assemble_string (const char *p, int size)
1799 /* If the string is very long, split it up. */
1803 int thissize = size - pos;
1804 if (thissize > maximum)
1807 ASM_OUTPUT_ASCII (asm_out_file, p, thissize);
1815 /* A noswitch_section_callback for lcomm_section. */
1818 emit_local (tree decl ATTRIBUTE_UNUSED,
1819 const char *name ATTRIBUTE_UNUSED,
1820 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1821 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1823 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1824 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, decl, name,
1825 size, DECL_ALIGN (decl));
1827 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1828 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, DECL_ALIGN (decl));
1831 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
1836 /* A noswitch_section_callback for bss_noswitch_section. */
1838 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
1840 emit_bss (tree decl ATTRIBUTE_UNUSED,
1841 const char *name ATTRIBUTE_UNUSED,
1842 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1843 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1845 #if defined ASM_OUTPUT_ALIGNED_BSS
1846 ASM_OUTPUT_ALIGNED_BSS (asm_out_file, decl, name, size, DECL_ALIGN (decl));
1849 ASM_OUTPUT_BSS (asm_out_file, decl, name, size, rounded);
1855 /* A noswitch_section_callback for comm_section. */
1858 emit_common (tree decl ATTRIBUTE_UNUSED,
1859 const char *name ATTRIBUTE_UNUSED,
1860 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1861 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1863 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1864 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, decl, name,
1865 size, DECL_ALIGN (decl));
1867 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1868 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, name, size, DECL_ALIGN (decl));
1871 ASM_OUTPUT_COMMON (asm_out_file, name, size, rounded);
1876 /* A noswitch_section_callback for tls_comm_section. */
1879 emit_tls_common (tree decl ATTRIBUTE_UNUSED,
1880 const char *name ATTRIBUTE_UNUSED,
1881 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1882 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1884 #ifdef ASM_OUTPUT_TLS_COMMON
1885 ASM_OUTPUT_TLS_COMMON (asm_out_file, decl, name, size);
1888 sorry ("thread-local COMMON data not implemented");
1893 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1894 NAME is the name of DECL's SYMBOL_REF. */
1897 assemble_noswitch_variable (tree decl, const char *name, section *sect)
1899 unsigned HOST_WIDE_INT size, rounded;
1901 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
1904 /* Don't allocate zero bytes of common,
1905 since that means "undefined external" in the linker. */
1909 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1910 so that each uninitialized object starts on such a boundary. */
1911 rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1;
1912 rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
1913 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
1915 if (!sect->noswitch.callback (decl, name, size, rounded)
1916 && (unsigned HOST_WIDE_INT) DECL_ALIGN_UNIT (decl) > rounded)
1917 warning (0, "requested alignment for %q+D is greater than "
1918 "implemented alignment of %wu", decl, rounded);
1921 /* A subroutine of assemble_variable. Output the label and contents of
1922 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1923 is as for assemble_variable. */
1926 assemble_variable_contents (tree decl, const char *name,
1927 bool dont_output_data)
1929 /* Do any machine/system dependent processing of the object. */
1930 #ifdef ASM_DECLARE_OBJECT_NAME
1931 last_assemble_variable_decl = decl;
1932 ASM_DECLARE_OBJECT_NAME (asm_out_file, name, decl);
1934 /* Standard thing is just output label for the object. */
1935 ASM_OUTPUT_LABEL (asm_out_file, name);
1936 #endif /* ASM_DECLARE_OBJECT_NAME */
1938 if (!dont_output_data)
1940 if (DECL_INITIAL (decl)
1941 && DECL_INITIAL (decl) != error_mark_node
1942 && !initializer_zerop (DECL_INITIAL (decl)))
1943 /* Output the actual data. */
1944 output_constant (DECL_INITIAL (decl),
1945 tree_low_cst (DECL_SIZE_UNIT (decl), 1),
1948 /* Leave space for it. */
1949 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl), 1));
1953 /* Assemble everything that is needed for a variable or function declaration.
1954 Not used for automatic variables, and not used for function definitions.
1955 Should not be called for variables of incomplete structure type.
1957 TOP_LEVEL is nonzero if this variable has file scope.
1958 AT_END is nonzero if this is the special handling, at end of compilation,
1959 to define things that have had only tentative definitions.
1960 DONT_OUTPUT_DATA if nonzero means don't actually output the
1961 initial value (that will be done by the caller). */
1964 assemble_variable (tree decl, int top_level ATTRIBUTE_UNUSED,
1965 int at_end ATTRIBUTE_UNUSED, int dont_output_data)
1968 rtx decl_rtl, symbol;
1971 if (! targetm.have_tls
1972 && TREE_CODE (decl) == VAR_DECL
1973 && DECL_THREAD_LOCAL_P (decl))
1975 tree to = emutls_decl (decl);
1977 /* If this variable is defined locally, then we need to initialize the
1978 control structure with size and alignment information. We do this
1979 at the last moment because tentative definitions can take a locally
1980 defined but uninitialized variable and initialize it later, which
1981 would result in incorrect contents. */
1982 if (! DECL_EXTERNAL (to)
1983 && (! DECL_COMMON (to)
1984 || (DECL_INITIAL (decl)
1985 && DECL_INITIAL (decl) != error_mark_node)))
1987 VEC(constructor_elt,gc) *v = VEC_alloc (constructor_elt, gc, 4);
1988 constructor_elt *elt;
1989 tree type = TREE_TYPE (to);
1990 tree field = TYPE_FIELDS (type);
1992 elt = VEC_quick_push (constructor_elt, v, NULL);
1994 elt->value = fold_convert (TREE_TYPE (field), DECL_SIZE_UNIT (decl));
1996 elt = VEC_quick_push (constructor_elt, v, NULL);
1997 field = TREE_CHAIN (field);
1999 elt->value = build_int_cst (TREE_TYPE (field),
2000 DECL_ALIGN_UNIT (decl));
2002 elt = VEC_quick_push (constructor_elt, v, NULL);
2003 field = TREE_CHAIN (field);
2005 elt->value = null_pointer_node;
2007 elt = VEC_quick_push (constructor_elt, v, NULL);
2008 field = TREE_CHAIN (field);
2010 elt->value = get_emutls_init_templ_addr (decl);
2012 DECL_INITIAL (to) = build_constructor (type, v);
2014 /* Make sure the template is marked as needed early enough.
2015 Without this, if the variable is placed in a
2016 section-anchored block, the template will only be marked
2017 when it's too late. */
2018 record_references_in_initializer (to);
2024 last_assemble_variable_decl = 0;
2026 /* Normally no need to say anything here for external references,
2027 since assemble_external is called by the language-specific code
2028 when a declaration is first seen. */
2030 if (DECL_EXTERNAL (decl))
2033 /* Output no assembler code for a function declaration.
2034 Only definitions of functions output anything. */
2036 if (TREE_CODE (decl) == FUNCTION_DECL)
2039 /* Do nothing for global register variables. */
2040 if (DECL_RTL_SET_P (decl) && REG_P (DECL_RTL (decl)))
2042 TREE_ASM_WRITTEN (decl) = 1;
2046 /* If type was incomplete when the variable was declared,
2047 see if it is complete now. */
2049 if (DECL_SIZE (decl) == 0)
2050 layout_decl (decl, 0);
2052 /* Still incomplete => don't allocate it; treat the tentative defn
2053 (which is what it must have been) as an `extern' reference. */
2055 if (!dont_output_data && DECL_SIZE (decl) == 0)
2057 error ("storage size of %q+D isn%'t known", decl);
2058 TREE_ASM_WRITTEN (decl) = 1;
2062 /* The first declaration of a variable that comes through this function
2063 decides whether it is global (in C, has external linkage)
2064 or local (in C, has internal linkage). So do nothing more
2065 if this function has already run. */
2067 if (TREE_ASM_WRITTEN (decl))
2070 /* Make sure targetm.encode_section_info is invoked before we set
2072 decl_rtl = DECL_RTL (decl);
2074 TREE_ASM_WRITTEN (decl) = 1;
2076 /* Do no output if -fsyntax-only. */
2077 if (flag_syntax_only)
2082 if (! dont_output_data
2083 && ! host_integerp (DECL_SIZE_UNIT (decl), 1))
2085 error ("size of variable %q+D is too large", decl);
2089 gcc_assert (MEM_P (decl_rtl));
2090 gcc_assert (GET_CODE (XEXP (decl_rtl, 0)) == SYMBOL_REF);
2091 symbol = XEXP (decl_rtl, 0);
2092 name = XSTR (symbol, 0);
2093 if (TREE_PUBLIC (decl) && DECL_NAME (decl))
2094 notice_global_symbol (decl);
2096 /* Compute the alignment of this data. */
2098 align_variable (decl, dont_output_data);
2099 set_mem_align (decl_rtl, DECL_ALIGN (decl));
2101 if (TREE_PUBLIC (decl))
2102 maybe_assemble_visibility (decl);
2104 if (DECL_PRESERVE_P (decl))
2105 targetm.asm_out.mark_decl_preserved (name);
2107 /* First make the assembler name(s) global if appropriate. */
2108 sect = get_variable_section (decl, false);
2109 if (TREE_PUBLIC (decl)
2111 && (sect->common.flags & SECTION_COMMON) == 0)
2112 globalize_decl (decl);
2114 /* Output any data that we will need to use the address of. */
2115 if (DECL_INITIAL (decl) && DECL_INITIAL (decl) != error_mark_node)
2116 output_addressed_constants (DECL_INITIAL (decl));
2118 /* dbxout.c needs to know this. */
2119 if (sect && (sect->common.flags & SECTION_CODE) != 0)
2120 DECL_IN_TEXT_SECTION (decl) = 1;
2122 /* If the decl is part of an object_block, make sure that the decl
2123 has been positioned within its block, but do not write out its
2124 definition yet. output_object_blocks will do that later. */
2125 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
2127 gcc_assert (!dont_output_data);
2128 place_block_symbol (symbol);
2130 else if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
2131 assemble_noswitch_variable (decl, name, sect);
2134 switch_to_section (sect);
2135 if (DECL_ALIGN (decl) > BITS_PER_UNIT)
2136 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (DECL_ALIGN_UNIT (decl)));
2137 assemble_variable_contents (decl, name, dont_output_data);
2141 /* Return 1 if type TYPE contains any pointers. */
2144 contains_pointers_p (tree type)
2146 switch (TREE_CODE (type))
2149 case REFERENCE_TYPE:
2150 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2151 so I'll play safe and return 1. */
2157 case QUAL_UNION_TYPE:
2160 /* For a type that has fields, see if the fields have pointers. */
2161 for (fields = TYPE_FIELDS (type); fields; fields = TREE_CHAIN (fields))
2162 if (TREE_CODE (fields) == FIELD_DECL
2163 && contains_pointers_p (TREE_TYPE (fields)))
2169 /* An array type contains pointers if its element type does. */
2170 return contains_pointers_p (TREE_TYPE (type));
2177 /* In unit-at-a-time mode, we delay assemble_external processing until
2178 the compilation unit is finalized. This is the best we can do for
2179 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2180 it all the way to final. See PR 17982 for further discussion. */
2181 static GTY(()) tree pending_assemble_externals;
2183 #ifdef ASM_OUTPUT_EXTERNAL
2184 /* True if DECL is a function decl for which no out-of-line copy exists.
2185 It is assumed that DECL's assembler name has been set. */
2188 incorporeal_function_p (tree decl)
2190 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
2194 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL
2195 && DECL_FUNCTION_CODE (decl) == BUILT_IN_ALLOCA)
2198 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
2199 if (strncmp (name, "__builtin_", strlen ("__builtin_")) == 0)
2205 /* Actually do the tests to determine if this is necessary, and invoke
2206 ASM_OUTPUT_EXTERNAL. */
2208 assemble_external_real (tree decl)
2210 rtx rtl = DECL_RTL (decl);
2212 if (MEM_P (rtl) && GET_CODE (XEXP (rtl, 0)) == SYMBOL_REF
2213 && !SYMBOL_REF_USED (XEXP (rtl, 0))
2214 && !incorporeal_function_p (decl))
2216 /* Some systems do require some output. */
2217 SYMBOL_REF_USED (XEXP (rtl, 0)) = 1;
2218 ASM_OUTPUT_EXTERNAL (asm_out_file, decl, XSTR (XEXP (rtl, 0), 0));
2224 process_pending_assemble_externals (void)
2226 #ifdef ASM_OUTPUT_EXTERNAL
2228 for (list = pending_assemble_externals; list; list = TREE_CHAIN (list))
2229 assemble_external_real (TREE_VALUE (list));
2231 pending_assemble_externals = 0;
2235 /* Output something to declare an external symbol to the assembler.
2236 (Most assemblers don't need this, so we normally output nothing.)
2237 Do nothing if DECL is not external. */
2240 assemble_external (tree decl ATTRIBUTE_UNUSED)
2242 /* Because most platforms do not define ASM_OUTPUT_EXTERNAL, the
2243 main body of this code is only rarely exercised. To provide some
2244 testing, on all platforms, we make sure that the ASM_OUT_FILE is
2245 open. If it's not, we should not be calling this function. */
2246 gcc_assert (asm_out_file);
2248 #ifdef ASM_OUTPUT_EXTERNAL
2249 if (!DECL_P (decl) || !DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl))
2252 /* We want to output external symbols at very last to check if they
2253 are references or not. */
2254 pending_assemble_externals = tree_cons (0, decl,
2255 pending_assemble_externals);
2259 /* Similar, for calling a library function FUN. */
2262 assemble_external_libcall (rtx fun)
2264 /* Declare library function name external when first used, if nec. */
2265 if (! SYMBOL_REF_USED (fun))
2267 SYMBOL_REF_USED (fun) = 1;
2268 targetm.asm_out.external_libcall (fun);
2272 /* Assemble a label named NAME. */
2275 assemble_label (const char *name)
2277 ASM_OUTPUT_LABEL (asm_out_file, name);
2280 /* Set the symbol_referenced flag for ID. */
2282 mark_referenced (tree id)
2284 TREE_SYMBOL_REFERENCED (id) = 1;
2287 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2289 mark_decl_referenced (tree decl)
2291 if (TREE_CODE (decl) == FUNCTION_DECL)
2293 /* Extern inline functions don't become needed when referenced.
2294 If we know a method will be emitted in other TU and no new
2295 functions can be marked reachable, just use the external
2297 struct cgraph_node *node = cgraph_node (decl);
2298 if (!DECL_EXTERNAL (decl)
2299 && (!node->local.vtable_method || !cgraph_global_info_ready
2300 || !node->local.finalized))
2301 cgraph_mark_needed_node (node);
2303 else if (TREE_CODE (decl) == VAR_DECL)
2305 struct varpool_node *node = varpool_node (decl);
2306 varpool_mark_needed_node (node);
2307 /* C++ frontend use mark_decl_references to force COMDAT variables
2308 to be output that might appear dead otherwise. */
2309 node->force_output = true;
2311 /* else do nothing - we can get various sorts of CST nodes here,
2312 which do not need to be marked. */
2316 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2317 until we find an identifier that is not itself a transparent alias.
2318 Modify the alias passed to it by reference (and all aliases on the
2319 way to the ultimate target), such that they do not have to be
2320 followed again, and return the ultimate target of the alias
2324 ultimate_transparent_alias_target (tree *alias)
2326 tree target = *alias;
2328 if (IDENTIFIER_TRANSPARENT_ALIAS (target))
2330 gcc_assert (TREE_CHAIN (target));
2331 target = ultimate_transparent_alias_target (&TREE_CHAIN (target));
2332 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target)
2333 && ! TREE_CHAIN (target));
2340 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2341 starts with a *, the rest of NAME is output verbatim. Otherwise
2342 NAME is transformed in a target-specific way (usually by the
2343 addition of an underscore). */
2346 assemble_name_raw (FILE *file, const char *name)
2349 fputs (&name[1], file);
2351 ASM_OUTPUT_LABELREF (file, name);
2354 /* Like assemble_name_raw, but should be used when NAME might refer to
2355 an entity that is also represented as a tree (like a function or
2356 variable). If NAME does refer to such an entity, that entity will
2357 be marked as referenced. */
2360 assemble_name (FILE *file, const char *name)
2362 const char *real_name;
2365 real_name = targetm.strip_name_encoding (name);
2367 id = maybe_get_identifier (real_name);
2372 mark_referenced (id);
2373 ultimate_transparent_alias_target (&id);
2375 name = IDENTIFIER_POINTER (id);
2376 gcc_assert (! TREE_CHAIN (id));
2379 assemble_name_raw (file, name);
2382 /* Allocate SIZE bytes writable static space with a gensym name
2383 and return an RTX to refer to its address. */
2386 assemble_static_space (unsigned HOST_WIDE_INT size)
2389 const char *namestring;
2392 ASM_GENERATE_INTERNAL_LABEL (name, "LF", const_labelno);
2394 namestring = ggc_strdup (name);
2396 x = gen_rtx_SYMBOL_REF (Pmode, namestring);
2397 SYMBOL_REF_FLAGS (x) = SYMBOL_FLAG_LOCAL;
2399 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2400 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, NULL_TREE, name, size,
2403 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2404 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, BIGGEST_ALIGNMENT);
2407 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2408 so that each uninitialized object starts on such a boundary. */
2409 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2410 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2411 = ((size + (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1)
2412 / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
2413 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
2414 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
2421 /* Assemble the static constant template for function entry trampolines.
2422 This is done at most once per compilation.
2423 Returns an RTX for the address of the template. */
2425 static GTY(()) rtx initial_trampoline;
2427 #ifdef TRAMPOLINE_TEMPLATE
2429 assemble_trampoline_template (void)
2436 if (initial_trampoline)
2437 return initial_trampoline;
2439 /* By default, put trampoline templates in read-only data section. */
2441 #ifdef TRAMPOLINE_SECTION
2442 switch_to_section (TRAMPOLINE_SECTION);
2444 switch_to_section (readonly_data_section);
2447 /* Write the assembler code to define one. */
2448 align = floor_log2 (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT);
2451 ASM_OUTPUT_ALIGN (asm_out_file, align);
2454 targetm.asm_out.internal_label (asm_out_file, "LTRAMP", 0);
2455 TRAMPOLINE_TEMPLATE (asm_out_file);
2457 /* Record the rtl to refer to it. */
2458 ASM_GENERATE_INTERNAL_LABEL (label, "LTRAMP", 0);
2459 name = ggc_strdup (label);
2460 symbol = gen_rtx_SYMBOL_REF (Pmode, name);
2461 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_LOCAL;
2463 initial_trampoline = gen_rtx_MEM (BLKmode, symbol);
2464 set_mem_align (initial_trampoline, TRAMPOLINE_ALIGNMENT);
2466 return initial_trampoline;
2470 /* A and B are either alignments or offsets. Return the minimum alignment
2471 that may be assumed after adding the two together. */
2473 static inline unsigned
2474 min_align (unsigned int a, unsigned int b)
2476 return (a | b) & -(a | b);
2479 /* Return the assembler directive for creating a given kind of integer
2480 object. SIZE is the number of bytes in the object and ALIGNED_P
2481 indicates whether it is known to be aligned. Return NULL if the
2482 assembly dialect has no such directive.
2484 The returned string should be printed at the start of a new line and
2485 be followed immediately by the object's initial value. */
2488 integer_asm_op (int size, int aligned_p)
2490 struct asm_int_op *ops;
2493 ops = &targetm.asm_out.aligned_op;
2495 ops = &targetm.asm_out.unaligned_op;
2500 return targetm.asm_out.byte_op;
2514 /* Use directive OP to assemble an integer object X. Print OP at the
2515 start of the line, followed immediately by the value of X. */
2518 assemble_integer_with_op (const char *op, rtx x)
2520 fputs (op, asm_out_file);
2521 output_addr_const (asm_out_file, x);
2522 fputc ('\n', asm_out_file);
2525 /* The default implementation of the asm_out.integer target hook. */
2528 default_assemble_integer (rtx x ATTRIBUTE_UNUSED,
2529 unsigned int size ATTRIBUTE_UNUSED,
2530 int aligned_p ATTRIBUTE_UNUSED)
2532 const char *op = integer_asm_op (size, aligned_p);
2533 /* Avoid GAS bugs for large values. Specifically negative values whose
2534 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2535 if (size > UNITS_PER_WORD && size > POINTER_SIZE / BITS_PER_UNIT)
2537 return op && (assemble_integer_with_op (op, x), true);
2540 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2541 the alignment of the integer in bits. Return 1 if we were able to output
2542 the constant, otherwise 0. We must be able to output the constant,
2543 if FORCE is nonzero. */
2546 assemble_integer (rtx x, unsigned int size, unsigned int align, int force)
2550 aligned_p = (align >= MIN (size * BITS_PER_UNIT, BIGGEST_ALIGNMENT));
2552 /* See if the target hook can handle this kind of object. */
2553 if (targetm.asm_out.integer (x, size, aligned_p))
2556 /* If the object is a multi-byte one, try splitting it up. Split
2557 it into words it if is multi-word, otherwise split it into bytes. */
2560 enum machine_mode omode, imode;
2561 unsigned int subalign;
2562 unsigned int subsize, i;
2563 unsigned char mclass;
2565 subsize = size > UNITS_PER_WORD? UNITS_PER_WORD : 1;
2566 subalign = MIN (align, subsize * BITS_PER_UNIT);
2567 if (GET_CODE (x) == CONST_FIXED)
2568 mclass = GET_MODE_CLASS (GET_MODE (x));
2572 omode = mode_for_size (subsize * BITS_PER_UNIT, mclass, 0);
2573 imode = mode_for_size (size * BITS_PER_UNIT, mclass, 0);
2575 for (i = 0; i < size; i += subsize)
2577 rtx partial = simplify_subreg (omode, x, imode, i);
2578 if (!partial || !assemble_integer (partial, subsize, subalign, 0))
2584 /* If we've printed some of it, but not all of it, there's no going
2589 gcc_assert (!force);
2595 assemble_real (REAL_VALUE_TYPE d, enum machine_mode mode, unsigned int align)
2597 long data[4] = {0, 0, 0, 0};
2599 int bitsize, nelts, nunits, units_per;
2601 /* This is hairy. We have a quantity of known size. real_to_target
2602 will put it into an array of *host* longs, 32 bits per element
2603 (even if long is more than 32 bits). We need to determine the
2604 number of array elements that are occupied (nelts) and the number
2605 of *target* min-addressable units that will be occupied in the
2606 object file (nunits). We cannot assume that 32 divides the
2607 mode's bitsize (size * BITS_PER_UNIT) evenly.
2609 size * BITS_PER_UNIT is used here to make sure that padding bits
2610 (which might appear at either end of the value; real_to_target
2611 will include the padding bits in its output array) are included. */
2613 nunits = GET_MODE_SIZE (mode);
2614 bitsize = nunits * BITS_PER_UNIT;
2615 nelts = CEIL (bitsize, 32);
2616 units_per = 32 / BITS_PER_UNIT;
2618 real_to_target (data, &d, mode);
2620 /* Put out the first word with the specified alignment. */
2621 assemble_integer (GEN_INT (data[0]), MIN (nunits, units_per), align, 1);
2622 nunits -= units_per;
2624 /* Subsequent words need only 32-bit alignment. */
2625 align = min_align (align, 32);
2627 for (i = 1; i < nelts; i++)
2629 assemble_integer (GEN_INT (data[i]), MIN (nunits, units_per), align, 1);
2630 nunits -= units_per;
2634 /* Given an expression EXP with a constant value,
2635 reduce it to the sum of an assembler symbol and an integer.
2636 Store them both in the structure *VALUE.
2637 EXP must be reducible. */
2639 struct addr_const GTY(())
2642 HOST_WIDE_INT offset;
2646 decode_addr_const (tree exp, struct addr_const *value)
2648 tree target = TREE_OPERAND (exp, 0);
2654 if (TREE_CODE (target) == COMPONENT_REF
2655 && host_integerp (byte_position (TREE_OPERAND (target, 1)), 0))
2658 offset += int_byte_position (TREE_OPERAND (target, 1));
2659 target = TREE_OPERAND (target, 0);
2661 else if (TREE_CODE (target) == ARRAY_REF
2662 || TREE_CODE (target) == ARRAY_RANGE_REF)
2664 offset += (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target)), 1)
2665 * tree_low_cst (TREE_OPERAND (target, 1), 0));
2666 target = TREE_OPERAND (target, 0);
2672 switch (TREE_CODE (target))
2676 x = DECL_RTL (target);
2680 x = gen_rtx_MEM (FUNCTION_MODE,
2681 gen_rtx_LABEL_REF (Pmode, force_label_rtx (target)));
2690 x = output_constant_def (target, 1);
2697 gcc_assert (MEM_P (x));
2701 value->offset = offset;
2704 /* Uniquize all constants that appear in memory.
2705 Each constant in memory thus far output is recorded
2706 in `const_desc_table'. */
2708 struct constant_descriptor_tree GTY(())
2710 /* A MEM for the constant. */
2713 /* The value of the constant. */
2716 /* Hash of value. Computing the hash from value each time
2717 hashfn is called can't work properly, as that means recursive
2718 use of the hash table during hash table expansion. */
2722 static GTY((param_is (struct constant_descriptor_tree)))
2723 htab_t const_desc_htab;
2725 static struct constant_descriptor_tree * build_constant_desc (tree);
2726 static void maybe_output_constant_def_contents (struct constant_descriptor_tree *, int);
2728 /* Compute a hash code for a constant expression. */
2731 const_desc_hash (const void *ptr)
2733 return ((const struct constant_descriptor_tree *)ptr)->hash;
2737 const_hash_1 (const tree exp)
2742 enum tree_code code = TREE_CODE (exp);
2744 /* Either set P and LEN to the address and len of something to hash and
2745 exit the switch or return a value. */
2750 p = (char *) &TREE_INT_CST (exp);
2751 len = sizeof TREE_INT_CST (exp);
2755 return real_hash (TREE_REAL_CST_PTR (exp));
2758 return fixed_hash (TREE_FIXED_CST_PTR (exp));
2761 p = TREE_STRING_POINTER (exp);
2762 len = TREE_STRING_LENGTH (exp);
2766 return (const_hash_1 (TREE_REALPART (exp)) * 5
2767 + const_hash_1 (TREE_IMAGPART (exp)));
2771 unsigned HOST_WIDE_INT idx;
2774 hi = 5 + int_size_in_bytes (TREE_TYPE (exp));
2776 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, value)
2778 hi = hi * 603 + const_hash_1 (value);
2786 struct addr_const value;
2788 decode_addr_const (exp, &value);
2789 switch (GET_CODE (value.base))
2792 /* Don't hash the address of the SYMBOL_REF;
2793 only use the offset and the symbol name. */
2795 p = XSTR (value.base, 0);
2796 for (i = 0; p[i] != 0; i++)
2797 hi = ((hi * 613) + (unsigned) (p[i]));
2801 hi = value.offset + CODE_LABEL_NUMBER (XEXP (value.base, 0)) * 13;
2811 case POINTER_PLUS_EXPR:
2813 return (const_hash_1 (TREE_OPERAND (exp, 0)) * 9
2814 + const_hash_1 (TREE_OPERAND (exp, 1)));
2818 return const_hash_1 (TREE_OPERAND (exp, 0)) * 7 + 2;
2821 /* A language specific constant. Just hash the code. */
2825 /* Compute hashing function. */
2827 for (i = 0; i < len; i++)
2828 hi = ((hi * 613) + (unsigned) (p[i]));
2833 /* Wrapper of compare_constant, for the htab interface. */
2835 const_desc_eq (const void *p1, const void *p2)
2837 const struct constant_descriptor_tree *c1 = p1;
2838 const struct constant_descriptor_tree *c2 = p2;
2839 if (c1->hash != c2->hash)
2841 return compare_constant (c1->value, c2->value);
2844 /* Compare t1 and t2, and return 1 only if they are known to result in
2845 the same bit pattern on output. */
2848 compare_constant (const tree t1, const tree t2)
2850 enum tree_code typecode;
2852 if (t1 == NULL_TREE)
2853 return t2 == NULL_TREE;
2854 if (t2 == NULL_TREE)
2857 if (TREE_CODE (t1) != TREE_CODE (t2))
2860 switch (TREE_CODE (t1))
2863 /* Integer constants are the same only if the same width of type. */
2864 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2866 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2868 return tree_int_cst_equal (t1, t2);
2871 /* Real constants are the same only if the same width of type. */
2872 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2875 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2));
2878 /* Fixed constants are the same only if the same width of type. */
2879 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2882 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1), TREE_FIXED_CST (t2));
2885 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2888 return (TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
2889 && ! memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
2890 TREE_STRING_LENGTH (t1)));
2893 return (compare_constant (TREE_REALPART (t1), TREE_REALPART (t2))
2894 && compare_constant (TREE_IMAGPART (t1), TREE_IMAGPART (t2)));
2898 VEC(constructor_elt, gc) *v1, *v2;
2899 unsigned HOST_WIDE_INT idx;
2901 typecode = TREE_CODE (TREE_TYPE (t1));
2902 if (typecode != TREE_CODE (TREE_TYPE (t2)))
2905 if (typecode == ARRAY_TYPE)
2907 HOST_WIDE_INT size_1 = int_size_in_bytes (TREE_TYPE (t1));
2908 /* For arrays, check that the sizes all match. */
2909 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2))
2911 || size_1 != int_size_in_bytes (TREE_TYPE (t2)))
2916 /* For record and union constructors, require exact type
2918 if (TREE_TYPE (t1) != TREE_TYPE (t2))
2922 v1 = CONSTRUCTOR_ELTS (t1);
2923 v2 = CONSTRUCTOR_ELTS (t2);
2924 if (VEC_length (constructor_elt, v1)
2925 != VEC_length (constructor_elt, v2))
2928 for (idx = 0; idx < VEC_length (constructor_elt, v1); ++idx)
2930 constructor_elt *c1 = VEC_index (constructor_elt, v1, idx);
2931 constructor_elt *c2 = VEC_index (constructor_elt, v2, idx);
2933 /* Check that each value is the same... */
2934 if (!compare_constant (c1->value, c2->value))
2936 /* ... and that they apply to the same fields! */
2937 if (typecode == ARRAY_TYPE)
2939 if (!compare_constant (c1->index, c2->index))
2944 if (c1->index != c2->index)
2955 struct addr_const value1, value2;
2957 decode_addr_const (t1, &value1);
2958 decode_addr_const (t2, &value2);
2959 return (value1.offset == value2.offset
2960 && strcmp (XSTR (value1.base, 0), XSTR (value2.base, 0)) == 0);
2964 case POINTER_PLUS_EXPR:
2967 return (compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0))
2968 && compare_constant(TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1)));
2972 case VIEW_CONVERT_EXPR:
2973 return compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
2982 /* Make a copy of the whole tree structure for a constant. This
2983 handles the same types of nodes that compare_constant handles. */
2986 copy_constant (tree exp)
2988 switch (TREE_CODE (exp))
2991 /* For ADDR_EXPR, we do not want to copy the decl whose address
2992 is requested. We do want to copy constants though. */
2993 if (CONSTANT_CLASS_P (TREE_OPERAND (exp, 0)))
2994 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
2995 copy_constant (TREE_OPERAND (exp, 0)));
2997 return copy_node (exp);
3003 return copy_node (exp);
3006 return build_complex (TREE_TYPE (exp),
3007 copy_constant (TREE_REALPART (exp)),
3008 copy_constant (TREE_IMAGPART (exp)));
3011 case POINTER_PLUS_EXPR:
3013 return build2 (TREE_CODE (exp), TREE_TYPE (exp),
3014 copy_constant (TREE_OPERAND (exp, 0)),
3015 copy_constant (TREE_OPERAND (exp, 1)));
3019 case VIEW_CONVERT_EXPR:
3020 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
3021 copy_constant (TREE_OPERAND (exp, 0)));
3025 tree copy = copy_node (exp);
3026 VEC(constructor_elt, gc) *v;
3027 unsigned HOST_WIDE_INT idx;
3028 tree purpose, value;
3030 v = VEC_alloc(constructor_elt, gc, VEC_length(constructor_elt,
3031 CONSTRUCTOR_ELTS (exp)));
3032 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp), idx, purpose, value)
3034 constructor_elt *ce = VEC_quick_push (constructor_elt, v, NULL);
3035 ce->index = purpose;
3036 ce->value = copy_constant (value);
3038 CONSTRUCTOR_ELTS (copy) = v;
3047 /* Return the alignment of constant EXP in bits. */
3050 get_constant_alignment (tree exp)
3054 align = TYPE_ALIGN (TREE_TYPE (exp));
3055 #ifdef CONSTANT_ALIGNMENT
3056 align = CONSTANT_ALIGNMENT (exp, align);
3061 /* Return the section into which constant EXP should be placed. */
3064 get_constant_section (tree exp)
3066 if (IN_NAMED_SECTION (exp))
3067 return get_named_section (exp, NULL, compute_reloc_for_constant (exp));
3069 return targetm.asm_out.select_section (exp,
3070 compute_reloc_for_constant (exp),
3071 get_constant_alignment (exp));
3074 /* Return the size of constant EXP in bytes. */
3076 static HOST_WIDE_INT
3077 get_constant_size (tree exp)
3081 size = int_size_in_bytes (TREE_TYPE (exp));
3082 if (TREE_CODE (exp) == STRING_CST)
3083 size = MAX (TREE_STRING_LENGTH (exp), size);
3087 /* Subroutine of output_constant_def:
3088 No constant equal to EXP is known to have been output.
3089 Make a constant descriptor to enter EXP in the hash table.
3090 Assign the label number and construct RTL to refer to the
3091 constant's location in memory.
3092 Caller is responsible for updating the hash table. */
3094 static struct constant_descriptor_tree *
3095 build_constant_desc (tree exp)
3101 struct constant_descriptor_tree *desc;
3103 desc = ggc_alloc (sizeof (*desc));
3104 desc->value = copy_constant (exp);
3106 /* Propagate marked-ness to copied constant. */
3107 if (flag_mudflap && mf_marked_p (exp))
3108 mf_mark (desc->value);
3110 /* Create a string containing the label name, in LABEL. */
3111 labelno = const_labelno++;
3112 ASM_GENERATE_INTERNAL_LABEL (label, "LC", labelno);
3114 /* We have a symbol name; construct the SYMBOL_REF and the MEM. */
3115 if (use_object_blocks_p ())
3117 section *sect = get_constant_section (exp);
3118 symbol = create_block_symbol (ggc_strdup (label),
3119 get_block_for_section (sect), -1);
3122 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3123 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3124 SET_SYMBOL_REF_DECL (symbol, desc->value);
3125 TREE_CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3127 rtl = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), symbol);
3128 set_mem_attributes (rtl, exp, 1);
3129 set_mem_alias_set (rtl, 0);
3130 set_mem_alias_set (rtl, const_alias_set);
3132 /* Set flags or add text to the name to record information, such as
3133 that it is a local symbol. If the name is changed, the macro
3134 ASM_OUTPUT_LABELREF will have to know how to strip this
3135 information. This call might invalidate our local variable
3136 SYMBOL; we can't use it afterward. */
3138 targetm.encode_section_info (exp, rtl, true);
3145 /* Return an rtx representing a reference to constant data in memory
3146 for the constant expression EXP.
3148 If assembler code for such a constant has already been output,
3149 return an rtx to refer to it.
3150 Otherwise, output such a constant in memory
3151 and generate an rtx for it.
3153 If DEFER is nonzero, this constant can be deferred and output only
3154 if referenced in the function after all optimizations.
3156 `const_desc_table' records which constants already have label strings. */
3159 output_constant_def (tree exp, int defer)
3161 struct constant_descriptor_tree *desc;
3162 struct constant_descriptor_tree key;
3165 /* Look up EXP in the table of constant descriptors. If we didn't find
3166 it, create a new one. */
3168 key.hash = const_hash_1 (exp);
3169 loc = htab_find_slot_with_hash (const_desc_htab, &key, key.hash, INSERT);
3174 desc = build_constant_desc (exp);
3175 desc->hash = key.hash;
3179 maybe_output_constant_def_contents (desc, defer);
3183 /* Subroutine of output_constant_def: Decide whether or not we need to
3184 output the constant DESC now, and if so, do it. */
3186 maybe_output_constant_def_contents (struct constant_descriptor_tree *desc,
3189 rtx symbol = XEXP (desc->rtl, 0);
3190 tree exp = desc->value;
3192 if (flag_syntax_only)
3195 if (TREE_ASM_WRITTEN (exp))
3196 /* Already output; don't do it again. */
3199 /* We can always defer constants as long as the context allows
3203 /* Increment n_deferred_constants if it exists. It needs to be at
3204 least as large as the number of constants actually referred to
3205 by the function. If it's too small we'll stop looking too early
3206 and fail to emit constants; if it's too large we'll only look
3207 through the entire function when we could have stopped earlier. */
3209 n_deferred_constants++;
3213 output_constant_def_contents (symbol);
3216 /* Subroutine of output_constant_def_contents. Output the definition
3217 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3218 constant's alignment in bits. */
3221 assemble_constant_contents (tree exp, const char *label, unsigned int align)
3225 size = get_constant_size (exp);
3227 /* Do any machine/system dependent processing of the constant. */
3228 #ifdef ASM_DECLARE_CONSTANT_NAME
3229 ASM_DECLARE_CONSTANT_NAME (asm_out_file, label, exp, size);
3231 /* Standard thing is just output label for the constant. */
3232 ASM_OUTPUT_LABEL (asm_out_file, label);
3233 #endif /* ASM_DECLARE_CONSTANT_NAME */
3235 /* Output the value of EXP. */
3236 output_constant (exp, size, align);
3239 /* We must output the constant data referred to by SYMBOL; do so. */
3242 output_constant_def_contents (rtx symbol)
3244 tree exp = SYMBOL_REF_DECL (symbol);
3247 /* Make sure any other constants whose addresses appear in EXP
3248 are assigned label numbers. */
3249 output_addressed_constants (exp);
3251 /* We are no longer deferring this constant. */
3252 TREE_ASM_WRITTEN (exp) = 1;
3254 /* If the constant is part of an object block, make sure that the
3255 decl has been positioned within its block, but do not write out
3256 its definition yet. output_object_blocks will do that later. */
3257 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
3258 place_block_symbol (symbol);
3261 switch_to_section (get_constant_section (exp));
3262 align = get_constant_alignment (exp);
3263 if (align > BITS_PER_UNIT)
3264 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
3265 assemble_constant_contents (exp, XSTR (symbol, 0), align);
3268 mudflap_enqueue_constant (exp);
3271 /* Look up EXP in the table of constant descriptors. Return the rtl
3272 if it has been emitted, else null. */
3275 lookup_constant_def (tree exp)
3277 struct constant_descriptor_tree *desc;
3278 struct constant_descriptor_tree key;
3281 key.hash = const_hash_1 (exp);
3282 desc = htab_find_with_hash (const_desc_htab, &key, key.hash);
3284 return (desc ? desc->rtl : NULL_RTX);
3287 /* Used in the hash tables to avoid outputting the same constant
3288 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3289 are output once per function, not once per file. */
3290 /* ??? Only a few targets need per-function constant pools. Most
3291 can use one per-file pool. Should add a targetm bit to tell the
3294 struct rtx_constant_pool GTY(())
3296 /* Pointers to first and last constant in pool, as ordered by offset. */
3297 struct constant_descriptor_rtx *first;
3298 struct constant_descriptor_rtx *last;
3300 /* Hash facility for making memory-constants from constant rtl-expressions.
3301 It is used on RISC machines where immediate integer arguments and
3302 constant addresses are restricted so that such constants must be stored
3304 htab_t GTY((param_is (struct constant_descriptor_rtx))) const_rtx_htab;
3306 /* Current offset in constant pool (does not include any
3307 machine-specific header). */
3308 HOST_WIDE_INT offset;
3311 struct constant_descriptor_rtx GTY((chain_next ("%h.next")))
3313 struct constant_descriptor_rtx *next;
3317 HOST_WIDE_INT offset;
3319 enum machine_mode mode;
3325 /* Hash and compare functions for const_rtx_htab. */
3328 const_desc_rtx_hash (const void *ptr)
3330 const struct constant_descriptor_rtx *desc = ptr;
3335 const_desc_rtx_eq (const void *a, const void *b)
3337 const struct constant_descriptor_rtx *x = a;
3338 const struct constant_descriptor_rtx *y = b;
3340 if (x->mode != y->mode)
3342 return rtx_equal_p (x->constant, y->constant);
3345 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3348 const_rtx_hash_1 (rtx *xp, void *data)
3350 unsigned HOST_WIDE_INT hwi;
3351 enum machine_mode mode;
3357 code = GET_CODE (x);
3358 mode = GET_MODE (x);
3359 h = (hashval_t) code * 1048573 + mode;
3367 const int shift = sizeof (hashval_t) * CHAR_BIT;
3368 const int n = sizeof (HOST_WIDE_INT) / sizeof (hashval_t);
3371 h ^= (hashval_t) hwi;
3372 for (i = 1; i < n; ++i)
3375 h ^= (hashval_t) hwi;
3381 if (mode == VOIDmode)
3383 hwi = CONST_DOUBLE_LOW (x) ^ CONST_DOUBLE_HIGH (x);
3387 h ^= real_hash (CONST_DOUBLE_REAL_VALUE (x));
3391 h ^= fixed_hash (CONST_FIXED_VALUE (x));
3397 for (i = XVECLEN (x, 0); i-- > 0; )
3398 h = h * 251 + const_rtx_hash_1 (&XVECEXP (x, 0, i), data);
3403 h ^= htab_hash_string (XSTR (x, 0));
3407 h = h * 251 + CODE_LABEL_NUMBER (XEXP (x, 0));
3411 case UNSPEC_VOLATILE:
3412 h = h * 251 + XINT (x, 1);
3420 *hp = *hp * 509 + h;
3424 /* Compute a hash value for X, which should be a constant. */
3427 const_rtx_hash (rtx x)
3430 for_each_rtx (&x, const_rtx_hash_1, &h);
3435 /* Create and return a new rtx constant pool. */
3437 static struct rtx_constant_pool *
3438 create_constant_pool (void)
3440 struct rtx_constant_pool *pool;
3442 pool = ggc_alloc (sizeof (struct rtx_constant_pool));
3443 pool->const_rtx_htab = htab_create_ggc (31, const_desc_rtx_hash,
3444 const_desc_rtx_eq, NULL);
3451 /* Initialize constant pool hashing for a new function. */
3454 init_varasm_status (void)
3456 crtl->varasm.pool = create_constant_pool ();
3457 crtl->varasm.deferred_constants = 0;
3460 /* Given a MINUS expression, simplify it if both sides
3461 include the same symbol. */
3464 simplify_subtraction (rtx x)
3466 rtx r = simplify_rtx (x);
3470 /* Given a constant rtx X, make (or find) a memory constant for its value
3471 and return a MEM rtx to refer to it in memory. */
3474 force_const_mem (enum machine_mode mode, rtx x)
3476 struct constant_descriptor_rtx *desc, tmp;
3477 struct rtx_constant_pool *pool;
3484 /* If we're not allowed to drop X into the constant pool, don't. */
3485 if (targetm.cannot_force_const_mem (x))
3488 /* Record that this function has used a constant pool entry. */
3489 current_function_uses_const_pool = 1;
3491 /* Decide which pool to use. */
3492 pool = (targetm.use_blocks_for_constant_p (mode, x)
3493 ? shared_constant_pool
3494 : crtl->varasm.pool);
3496 /* Lookup the value in the hashtable. */
3499 hash = const_rtx_hash (x);
3500 slot = htab_find_slot_with_hash (pool->const_rtx_htab, &tmp, hash, INSERT);
3503 /* If the constant was already present, return its memory. */
3505 return copy_rtx (desc->mem);
3507 /* Otherwise, create a new descriptor. */
3508 desc = ggc_alloc (sizeof (*desc));
3511 /* Align the location counter as required by EXP's data type. */
3512 align = GET_MODE_ALIGNMENT (mode == VOIDmode ? word_mode : mode);
3513 #ifdef CONSTANT_ALIGNMENT
3515 tree type = lang_hooks.types.type_for_mode (mode, 0);
3516 if (type != NULL_TREE)
3517 align = CONSTANT_ALIGNMENT (make_tree (type, x), align);
3521 pool->offset += (align / BITS_PER_UNIT) - 1;
3522 pool->offset &= ~ ((align / BITS_PER_UNIT) - 1);
3525 desc->constant = tmp.constant;
3526 desc->offset = pool->offset;
3529 desc->align = align;
3530 desc->labelno = const_labelno;
3533 pool->offset += GET_MODE_SIZE (mode);
3535 pool->last->next = desc;
3537 pool->first = pool->last = desc;
3540 /* Create a string containing the label name, in LABEL. */
3541 ASM_GENERATE_INTERNAL_LABEL (label, "LC", const_labelno);
3544 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3545 the constants pool. */
3546 if (use_object_blocks_p () && targetm.use_blocks_for_constant_p (mode, x))
3548 section *sect = targetm.asm_out.select_rtx_section (mode, x, align);
3549 symbol = create_block_symbol (ggc_strdup (label),
3550 get_block_for_section (sect), -1);
3553 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3555 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3556 CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3557 SET_SYMBOL_REF_CONSTANT (symbol, desc);
3559 /* Construct the MEM. */
3560 desc->mem = def = gen_const_mem (mode, symbol);
3561 set_mem_attributes (def, lang_hooks.types.type_for_mode (mode, 0), 1);
3562 set_mem_align (def, align);
3564 /* If we're dropping a label to the constant pool, make sure we
3566 if (GET_CODE (x) == LABEL_REF)
3567 LABEL_PRESERVE_P (XEXP (x, 0)) = 1;
3569 return copy_rtx (def);
3572 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3575 get_pool_constant (rtx addr)
3577 return SYMBOL_REF_CONSTANT (addr)->constant;
3580 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3581 and whether it has been output or not. */
3584 get_pool_constant_mark (rtx addr, bool *pmarked)
3586 struct constant_descriptor_rtx *desc;
3588 desc = SYMBOL_REF_CONSTANT (addr);
3589 *pmarked = (desc->mark != 0);
3590 return desc->constant;
3593 /* Similar, return the mode. */
3596 get_pool_mode (const_rtx addr)
3598 return SYMBOL_REF_CONSTANT (addr)->mode;
3601 /* Return the size of the constant pool. */
3604 get_pool_size (void)
3606 return crtl->varasm.pool->offset;
3609 /* Worker function for output_constant_pool_1. Emit assembly for X
3610 in MODE with known alignment ALIGN. */
3613 output_constant_pool_2 (enum machine_mode mode, rtx x, unsigned int align)
3615 switch (GET_MODE_CLASS (mode))
3618 case MODE_DECIMAL_FLOAT:
3622 gcc_assert (GET_CODE (x) == CONST_DOUBLE);
3623 REAL_VALUE_FROM_CONST_DOUBLE (r, x);
3624 assemble_real (r, mode, align);
3629 case MODE_PARTIAL_INT:
3634 assemble_integer (x, GET_MODE_SIZE (mode), align, 1);
3637 case MODE_VECTOR_FLOAT:
3638 case MODE_VECTOR_INT:
3639 case MODE_VECTOR_FRACT:
3640 case MODE_VECTOR_UFRACT:
3641 case MODE_VECTOR_ACCUM:
3642 case MODE_VECTOR_UACCUM:
3645 enum machine_mode submode = GET_MODE_INNER (mode);
3646 unsigned int subalign = MIN (align, GET_MODE_BITSIZE (submode));
3648 gcc_assert (GET_CODE (x) == CONST_VECTOR);
3649 units = CONST_VECTOR_NUNITS (x);
3651 for (i = 0; i < units; i++)
3653 rtx elt = CONST_VECTOR_ELT (x, i);
3654 output_constant_pool_2 (submode, elt, i ? subalign : align);
3664 /* Worker function for output_constant_pool. Emit constant DESC,
3665 giving it ALIGN bits of alignment. */
3668 output_constant_pool_1 (struct constant_descriptor_rtx *desc,
3675 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3676 whose CODE_LABEL has been deleted. This can occur if a jump table
3677 is eliminated by optimization. If so, write a constant of zero
3678 instead. Note that this can also happen by turning the
3679 CODE_LABEL into a NOTE. */
3680 /* ??? This seems completely and utterly wrong. Certainly it's
3681 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3682 functioning even with INSN_DELETED_P and friends. */
3685 switch (GET_CODE (tmp))
3688 if (GET_CODE (XEXP (tmp, 0)) != PLUS
3689 || GET_CODE (XEXP (XEXP (tmp, 0), 0)) != LABEL_REF)
3691 tmp = XEXP (XEXP (tmp, 0), 0);
3695 tmp = XEXP (tmp, 0);
3696 gcc_assert (!INSN_DELETED_P (tmp));
3697 gcc_assert (!NOTE_P (tmp)
3698 || NOTE_KIND (tmp) != NOTE_INSN_DELETED);
3705 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3706 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file, x, desc->mode,
3707 align, desc->labelno, done);
3710 assemble_align (align);
3712 /* Output the label. */
3713 targetm.asm_out.internal_label (asm_out_file, "LC", desc->labelno);
3715 /* Output the data. */
3716 output_constant_pool_2 (desc->mode, x, align);
3718 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3719 sections have proper size. */
3720 if (align > GET_MODE_BITSIZE (desc->mode)
3722 && (in_section->common.flags & SECTION_MERGE))
3723 assemble_align (align);
3725 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3731 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3732 to as used. Emit referenced deferred strings. This function can
3733 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3736 mark_constant (rtx *current_rtx, void *data ATTRIBUTE_UNUSED)
3738 rtx x = *current_rtx;
3740 if (x == NULL_RTX || GET_CODE (x) != SYMBOL_REF)
3743 if (CONSTANT_POOL_ADDRESS_P (x))
3745 struct constant_descriptor_rtx *desc = SYMBOL_REF_CONSTANT (x);
3746 if (desc->mark == 0)
3749 for_each_rtx (&desc->constant, mark_constant, NULL);
3752 else if (TREE_CONSTANT_POOL_ADDRESS_P (x))
3754 tree exp = SYMBOL_REF_DECL (x);
3755 if (!TREE_ASM_WRITTEN (exp))
3757 n_deferred_constants--;
3758 output_constant_def_contents (x);
3765 /* Look through appropriate parts of INSN, marking all entries in the
3766 constant pool which are actually being used. Entries that are only
3767 referenced by other constants are also marked as used. Emit
3768 deferred strings that are used. */
3771 mark_constants (rtx insn)
3776 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3777 insns, not any notes that may be attached. We don't want to mark
3778 a constant just because it happens to appear in a REG_EQUIV note. */
3779 if (GET_CODE (PATTERN (insn)) == SEQUENCE)
3781 rtx seq = PATTERN (insn);
3782 int i, n = XVECLEN (seq, 0);
3783 for (i = 0; i < n; ++i)
3785 rtx subinsn = XVECEXP (seq, 0, i);
3786 if (INSN_P (subinsn))
3787 for_each_rtx (&PATTERN (subinsn), mark_constant, NULL);
3791 for_each_rtx (&PATTERN (insn), mark_constant, NULL);
3794 /* Look through the instructions for this function, and mark all the
3795 entries in POOL which are actually being used. Emit deferred constants
3796 which have indeed been used. */
3799 mark_constant_pool (void)
3803 if (!current_function_uses_const_pool && n_deferred_constants == 0)
3806 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
3807 mark_constants (insn);
3809 for (link = crtl->epilogue_delay_list;
3811 link = XEXP (link, 1))
3812 mark_constants (XEXP (link, 0));
3815 /* Write all the constants in POOL. */
3818 output_constant_pool_contents (struct rtx_constant_pool *pool)
3820 struct constant_descriptor_rtx *desc;
3822 for (desc = pool->first; desc ; desc = desc->next)
3825 /* If the constant is part of an object_block, make sure that
3826 the constant has been positioned within its block, but do not
3827 write out its definition yet. output_object_blocks will do
3829 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc->sym)
3830 && SYMBOL_REF_BLOCK (desc->sym))
3831 place_block_symbol (desc->sym);
3834 switch_to_section (targetm.asm_out.select_rtx_section
3835 (desc->mode, desc->constant, desc->align));
3836 output_constant_pool_1 (desc, desc->align);
3841 /* Mark all constants that are used in the current function, then write
3842 out the function's private constant pool. */
3845 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED,
3846 tree fndecl ATTRIBUTE_UNUSED)
3848 struct rtx_constant_pool *pool = crtl->varasm.pool;
3850 /* It is possible for gcc to call force_const_mem and then to later
3851 discard the instructions which refer to the constant. In such a
3852 case we do not need to output the constant. */
3853 mark_constant_pool ();
3855 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3856 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file, fnname, fndecl, pool->offset);
3859 output_constant_pool_contents (pool);
3861 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3862 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file, fnname, fndecl, pool->offset);
3866 /* Write the contents of the shared constant pool. */
3869 output_shared_constant_pool (void)
3871 output_constant_pool_contents (shared_constant_pool);
3874 /* Determine what kind of relocations EXP may need. */
3877 compute_reloc_for_constant (tree exp)
3879 int reloc = 0, reloc2;
3882 switch (TREE_CODE (exp))
3886 /* Go inside any operations that get_inner_reference can handle and see
3887 if what's inside is a constant: no need to do anything here for
3888 addresses of variables or functions. */
3889 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
3890 tem = TREE_OPERAND (tem, 0))
3893 if (TREE_PUBLIC (tem))
3900 case POINTER_PLUS_EXPR:
3901 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3902 reloc |= compute_reloc_for_constant (TREE_OPERAND (exp, 1));
3906 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3907 reloc2 = compute_reloc_for_constant (TREE_OPERAND (exp, 1));
3908 /* The difference of two local labels is computable at link time. */
3909 if (reloc == 1 && reloc2 == 1)
3917 case VIEW_CONVERT_EXPR:
3918 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3923 unsigned HOST_WIDE_INT idx;
3924 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
3926 reloc |= compute_reloc_for_constant (tem);
3936 /* Find all the constants whose addresses are referenced inside of EXP,
3937 and make sure assembler code with a label has been output for each one.
3938 Indicate whether an ADDR_EXPR has been encountered. */
3941 output_addressed_constants (tree exp)
3945 switch (TREE_CODE (exp))
3949 /* Go inside any operations that get_inner_reference can handle and see
3950 if what's inside is a constant: no need to do anything here for
3951 addresses of variables or functions. */
3952 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
3953 tem = TREE_OPERAND (tem, 0))
3956 /* If we have an initialized CONST_DECL, retrieve the initializer. */
3957 if (TREE_CODE (tem) == CONST_DECL && DECL_INITIAL (tem))
3958 tem = DECL_INITIAL (tem);
3960 if (CONSTANT_CLASS_P (tem) || TREE_CODE (tem) == CONSTRUCTOR)
3961 output_constant_def (tem, 0);
3965 case POINTER_PLUS_EXPR:
3967 output_addressed_constants (TREE_OPERAND (exp, 1));
3972 case VIEW_CONVERT_EXPR:
3973 output_addressed_constants (TREE_OPERAND (exp, 0));
3978 unsigned HOST_WIDE_INT idx;
3979 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
3981 output_addressed_constants (tem);
3990 /* Whether a constructor CTOR is a valid static constant initializer if all
3991 its elements are. This used to be internal to initializer_constant_valid_p
3992 and has been exposed to let other functions like categorize_ctor_elements
3993 evaluate the property while walking a constructor for other purposes. */
3996 constructor_static_from_elts_p (const_tree ctor)
3998 return (TREE_CONSTANT (ctor)
3999 && (TREE_CODE (TREE_TYPE (ctor)) == UNION_TYPE
4000 || TREE_CODE (TREE_TYPE (ctor)) == RECORD_TYPE)
4001 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (ctor)));
4004 /* Return nonzero if VALUE is a valid constant-valued expression
4005 for use in initializing a static variable; one that can be an
4006 element of a "constant" initializer.
4008 Return null_pointer_node if the value is absolute;
4009 if it is relocatable, return the variable that determines the relocation.
4010 We assume that VALUE has been folded as much as possible;
4011 therefore, we do not need to check for such things as
4012 arithmetic-combinations of integers. */
4015 initializer_constant_valid_p (tree value, tree endtype)
4017 switch (TREE_CODE (value))
4020 if (constructor_static_from_elts_p (value))
4022 unsigned HOST_WIDE_INT idx;
4024 bool absolute = true;
4026 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value), idx, elt)
4029 reloc = initializer_constant_valid_p (elt, TREE_TYPE (elt));
4032 if (reloc != null_pointer_node)
4035 /* For a non-absolute relocation, there is no single
4036 variable that can be "the variable that determines the
4038 return absolute ? null_pointer_node : error_mark_node;
4041 return TREE_STATIC (value) ? null_pointer_node : NULL_TREE;
4049 return null_pointer_node;
4053 value = staticp (TREE_OPERAND (value, 0));
4056 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out to
4057 be a constant, this is old-skool offsetof-like nonsense. */
4058 if (TREE_CODE (value) == INDIRECT_REF
4059 && TREE_CONSTANT (TREE_OPERAND (value, 0)))
4060 return null_pointer_node;
4061 /* Taking the address of a nested function involves a trampoline. */
4062 if (TREE_CODE (value) == FUNCTION_DECL
4063 && decl_function_context (value)
4064 && !DECL_NO_STATIC_CHAIN (value))
4066 /* "&{...}" requires a temporary to hold the constructed
4068 if (TREE_CODE (value) == CONSTRUCTOR)
4073 case VIEW_CONVERT_EXPR:
4074 case NON_LVALUE_EXPR:
4075 return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype);
4084 src = TREE_OPERAND (value, 0);
4085 src_type = TREE_TYPE (src);
4086 dest_type = TREE_TYPE (value);
4088 /* Allow conversions between pointer types, floating-point
4089 types, and offset types. */
4090 if ((POINTER_TYPE_P (dest_type) && POINTER_TYPE_P (src_type))
4091 || (FLOAT_TYPE_P (dest_type) && FLOAT_TYPE_P (src_type))
4092 || (TREE_CODE (dest_type) == OFFSET_TYPE
4093 && TREE_CODE (src_type) == OFFSET_TYPE))
4094 return initializer_constant_valid_p (src, endtype);
4096 /* Allow length-preserving conversions between integer types. */
4097 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type)
4098 && (TYPE_PRECISION (dest_type) == TYPE_PRECISION (src_type)))
4099 return initializer_constant_valid_p (src, endtype);
4101 /* Allow conversions between other integer types only if
4103 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type))
4105 tree inner = initializer_constant_valid_p (src, endtype);
4106 if (inner == null_pointer_node)
4107 return null_pointer_node;
4111 /* Allow (int) &foo provided int is as wide as a pointer. */
4112 if (INTEGRAL_TYPE_P (dest_type) && POINTER_TYPE_P (src_type)
4113 && (TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type)))
4114 return initializer_constant_valid_p (src, endtype);
4116 /* Likewise conversions from int to pointers, but also allow
4117 conversions from 0. */
4118 if ((POINTER_TYPE_P (dest_type)
4119 || TREE_CODE (dest_type) == OFFSET_TYPE)
4120 && INTEGRAL_TYPE_P (src_type))
4122 if (TREE_CODE (src) == INTEGER_CST
4123 && TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type))
4124 return null_pointer_node;
4125 if (integer_zerop (src))
4126 return null_pointer_node;
4127 else if (TYPE_PRECISION (dest_type) <= TYPE_PRECISION (src_type))
4128 return initializer_constant_valid_p (src, endtype);
4131 /* Allow conversions to struct or union types if the value
4133 if (TREE_CODE (dest_type) == RECORD_TYPE
4134 || TREE_CODE (dest_type) == UNION_TYPE)
4135 return initializer_constant_valid_p (src, endtype);
4139 case POINTER_PLUS_EXPR:
4141 if (! INTEGRAL_TYPE_P (endtype)
4142 || TYPE_PRECISION (endtype) >= POINTER_SIZE)
4144 tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
4146 tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
4148 /* If either term is absolute, use the other term's relocation. */
4149 if (valid0 == null_pointer_node)
4151 if (valid1 == null_pointer_node)
4157 if (! INTEGRAL_TYPE_P (endtype)
4158 || TYPE_PRECISION (endtype) >= POINTER_SIZE)
4160 tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
4162 tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
4164 /* Win if second argument is absolute. */
4165 if (valid1 == null_pointer_node)
4167 /* Win if both arguments have the same relocation.
4168 Then the value is absolute. */
4169 if (valid0 == valid1 && valid0 != 0)
4170 return null_pointer_node;
4172 /* Since GCC guarantees that string constants are unique in the
4173 generated code, a subtraction between two copies of the same
4174 constant string is absolute. */
4175 if (valid0 && TREE_CODE (valid0) == STRING_CST
4176 && valid1 && TREE_CODE (valid1) == STRING_CST
4177 && operand_equal_p (valid0, valid1, 1))
4178 return null_pointer_node;
4181 /* Support narrowing differences. */
4182 if (INTEGRAL_TYPE_P (endtype))
4186 op0 = TREE_OPERAND (value, 0);
4187 op1 = TREE_OPERAND (value, 1);
4189 /* Like STRIP_NOPS except allow the operand mode to widen.
4190 This works around a feature of fold that simplifies
4191 (int)(p1 - p2) to ((int)p1 - (int)p2) under the theory
4192 that the narrower operation is cheaper. */
4194 while (TREE_CODE (op0) == NOP_EXPR
4195 || TREE_CODE (op0) == CONVERT_EXPR
4196 || TREE_CODE (op0) == NON_LVALUE_EXPR)
4198 tree inner = TREE_OPERAND (op0, 0);
4199 if (inner == error_mark_node
4200 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
4201 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0)))
4202 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
4207 while (TREE_CODE (op1) == NOP_EXPR
4208 || TREE_CODE (op1) == CONVERT_EXPR
4209 || TREE_CODE (op1) == NON_LVALUE_EXPR)
4211 tree inner = TREE_OPERAND (op1, 0);
4212 if (inner == error_mark_node
4213 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
4214 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1)))
4215 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
4220 op0 = initializer_constant_valid_p (op0, endtype);
4221 op1 = initializer_constant_valid_p (op1, endtype);
4223 /* Both initializers must be known. */
4227 return null_pointer_node;
4229 /* Support differences between labels. */
4230 if (TREE_CODE (op0) == LABEL_DECL
4231 && TREE_CODE (op1) == LABEL_DECL)
4232 return null_pointer_node;
4234 if (TREE_CODE (op0) == STRING_CST
4235 && TREE_CODE (op1) == STRING_CST
4236 && operand_equal_p (op0, op1, 1))
4237 return null_pointer_node;
4249 /* Output assembler code for constant EXP to FILE, with no label.
4250 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4251 Assumes output_addressed_constants has been done on EXP already.
4253 Generate exactly SIZE bytes of assembler data, padding at the end
4254 with zeros if necessary. SIZE must always be specified.
4256 SIZE is important for structure constructors,
4257 since trailing members may have been omitted from the constructor.
4258 It is also important for initialization of arrays from string constants
4259 since the full length of the string constant might not be wanted.
4260 It is also needed for initialization of unions, where the initializer's
4261 type is just one member, and that may not be as long as the union.
4263 There a case in which we would fail to output exactly SIZE bytes:
4264 for a structure constructor that wants to produce more than SIZE bytes.
4265 But such constructors will never be generated for any possible input.
4267 ALIGN is the alignment of the data in bits. */
4270 output_constant (tree exp, unsigned HOST_WIDE_INT size, unsigned int align)
4272 enum tree_code code;
4273 unsigned HOST_WIDE_INT thissize;
4275 if (size == 0 || flag_syntax_only)
4278 /* See if we're trying to initialize a pointer in a non-default mode
4279 to the address of some declaration somewhere. If the target says
4280 the mode is valid for pointers, assume the target has a way of
4282 if (TREE_CODE (exp) == NOP_EXPR
4283 && POINTER_TYPE_P (TREE_TYPE (exp))
4284 && targetm.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp))))
4286 tree saved_type = TREE_TYPE (exp);
4288 /* Peel off any intermediate conversions-to-pointer for valid
4290 while (TREE_CODE (exp) == NOP_EXPR
4291 && POINTER_TYPE_P (TREE_TYPE (exp))
4292 && targetm.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp))))
4293 exp = TREE_OPERAND (exp, 0);
4295 /* If what we're left with is the address of something, we can
4296 convert the address to the final type and output it that
4298 if (TREE_CODE (exp) == ADDR_EXPR)
4299 exp = build1 (ADDR_EXPR, saved_type, TREE_OPERAND (exp, 0));
4300 /* Likewise for constant ints. */
4301 else if (TREE_CODE (exp) == INTEGER_CST)
4302 exp = build_int_cst_wide (saved_type, TREE_INT_CST_LOW (exp),
4303 TREE_INT_CST_HIGH (exp));
4307 /* Eliminate any conversions since we'll be outputting the underlying
4309 while (TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR
4310 || TREE_CODE (exp) == NON_LVALUE_EXPR
4311 || TREE_CODE (exp) == VIEW_CONVERT_EXPR)
4313 HOST_WIDE_INT type_size = int_size_in_bytes (TREE_TYPE (exp));
4314 HOST_WIDE_INT op_size = int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp, 0)));
4316 /* Make sure eliminating the conversion is really a no-op, except with
4317 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4318 union types to allow for Ada unchecked unions. */
4319 if (type_size > op_size
4320 && TREE_CODE (exp) != VIEW_CONVERT_EXPR
4321 && TREE_CODE (TREE_TYPE (exp)) != UNION_TYPE)
4322 /* Keep the conversion. */
4325 exp = TREE_OPERAND (exp, 0);
4328 code = TREE_CODE (TREE_TYPE (exp));
4329 thissize = int_size_in_bytes (TREE_TYPE (exp));
4331 /* Allow a constructor with no elements for any data type.
4332 This means to fill the space with zeros. */
4333 if (TREE_CODE (exp) == CONSTRUCTOR
4334 && VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (exp)))
4336 assemble_zeros (size);
4340 if (TREE_CODE (exp) == FDESC_EXPR)
4342 #ifdef ASM_OUTPUT_FDESC
4343 HOST_WIDE_INT part = tree_low_cst (TREE_OPERAND (exp, 1), 0);
4344 tree decl = TREE_OPERAND (exp, 0);
4345 ASM_OUTPUT_FDESC (asm_out_file, decl, part);
4352 /* Now output the underlying data. If we've handling the padding, return.
4353 Otherwise, break and ensure SIZE is the size written. */
4360 case REFERENCE_TYPE:
4362 case FIXED_POINT_TYPE:
4363 if (! assemble_integer (expand_expr (exp, NULL_RTX, VOIDmode,
4364 EXPAND_INITIALIZER),
4365 MIN (size, thissize), align, 0))
4366 error ("initializer for integer/fixed-point value is too complicated");
4370 if (TREE_CODE (exp) != REAL_CST)
4371 error ("initializer for floating value is not a floating constant");
4373 assemble_real (TREE_REAL_CST (exp), TYPE_MODE (TREE_TYPE (exp)), align);
4377 output_constant (TREE_REALPART (exp), thissize / 2, align);
4378 output_constant (TREE_IMAGPART (exp), thissize / 2,
4379 min_align (align, BITS_PER_UNIT * (thissize / 2)));
4384 switch (TREE_CODE (exp))
4387 output_constructor (exp, size, align);
4390 thissize = MIN ((unsigned HOST_WIDE_INT)TREE_STRING_LENGTH (exp),
4392 assemble_string (TREE_STRING_POINTER (exp), thissize);
4399 unsigned int nalign;
4400 enum machine_mode inner;
4402 inner = TYPE_MODE (TREE_TYPE (TREE_TYPE (exp)));
4403 nalign = MIN (align, GET_MODE_ALIGNMENT (inner));
4405 elt_size = GET_MODE_SIZE (inner);
4407 link = TREE_VECTOR_CST_ELTS (exp);
4408 output_constant (TREE_VALUE (link), elt_size, align);
4409 thissize = elt_size;
4410 while ((link = TREE_CHAIN (link)) != NULL)
4412 output_constant (TREE_VALUE (link), elt_size, nalign);
4413 thissize += elt_size;
4424 gcc_assert (TREE_CODE (exp) == CONSTRUCTOR);
4425 output_constructor (exp, size, align);
4435 if (size > thissize)
4436 assemble_zeros (size - thissize);
4440 /* Subroutine of output_constructor, used for computing the size of
4441 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4442 type with an unspecified upper bound. */
4444 static unsigned HOST_WIDE_INT
4445 array_size_for_constructor (tree val)
4448 unsigned HOST_WIDE_INT cnt;
4449 tree index, value, tmp;
4451 /* This code used to attempt to handle string constants that are not
4452 arrays of single-bytes, but nothing else does, so there's no point in
4454 if (TREE_CODE (val) == STRING_CST)
4455 return TREE_STRING_LENGTH (val);
4457 max_index = NULL_TREE;
4458 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val), cnt, index, value)
4460 if (TREE_CODE (index) == RANGE_EXPR)
4461 index = TREE_OPERAND (index, 1);
4462 if (max_index == NULL_TREE || tree_int_cst_lt (max_index, index))
4466 if (max_index == NULL_TREE)
4469 /* Compute the total number of array elements. */
4470 tmp = TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val)));
4471 i = size_binop (MINUS_EXPR, fold_convert (sizetype, max_index),
4472 fold_convert (sizetype, tmp));
4473 i = size_binop (PLUS_EXPR, i, build_int_cst (sizetype, 1));
4475 /* Multiply by the array element unit size to find number of bytes. */
4476 i = size_binop (MULT_EXPR, i, TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val))));
4478 return tree_low_cst (i, 1);
4481 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
4482 Generate at least SIZE bytes, padding if necessary. */
4485 output_constructor (tree exp, unsigned HOST_WIDE_INT size,
4488 tree type = TREE_TYPE (exp);
4491 /* Number of bytes output or skipped so far.
4492 In other words, current position within the constructor. */
4493 HOST_WIDE_INT total_bytes = 0;
4494 /* Nonzero means BYTE contains part of a byte, to be output. */
4495 int byte_buffer_in_use = 0;
4497 unsigned HOST_WIDE_INT cnt;
4498 constructor_elt *ce;
4500 gcc_assert (HOST_BITS_PER_WIDE_INT >= BITS_PER_UNIT);
4502 if (TREE_CODE (type) == RECORD_TYPE)
4503 field = TYPE_FIELDS (type);
4505 if (TREE_CODE (type) == ARRAY_TYPE
4506 && TYPE_DOMAIN (type) != 0)
4507 min_index = TYPE_MIN_VALUE (TYPE_DOMAIN (type));
4509 /* As LINK goes through the elements of the constant,
4510 FIELD goes through the structure fields, if the constant is a structure.
4511 if the constant is a union, then we override this,
4512 by getting the field from the TREE_LIST element.
4513 But the constant could also be an array. Then FIELD is zero.
4515 There is always a maximum of one element in the chain LINK for unions
4516 (even if the initializer in a source program incorrectly contains
4519 VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (exp), cnt, ce);
4520 cnt++, field = field ? TREE_CHAIN (field) : 0)
4522 tree val = ce->value;
4525 /* The element in a union constructor specifies the proper field
4527 if ((TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE
4528 || TREE_CODE (type) == QUAL_UNION_TYPE)
4532 else if (TREE_CODE (type) == ARRAY_TYPE)
4535 #ifdef ASM_COMMENT_START
4536 if (field && flag_verbose_asm)
4537 fprintf (asm_out_file, "%s %s:\n",
4540 ? IDENTIFIER_POINTER (DECL_NAME (field))
4544 /* Eliminate the marker that makes a cast not be an lvalue. */
4548 if (index && TREE_CODE (index) == RANGE_EXPR)
4550 unsigned HOST_WIDE_INT fieldsize
4551 = int_size_in_bytes (TREE_TYPE (type));
4552 HOST_WIDE_INT lo_index = tree_low_cst (TREE_OPERAND (index, 0), 0);
4553 HOST_WIDE_INT hi_index = tree_low_cst (TREE_OPERAND (index, 1), 0);
4554 HOST_WIDE_INT index;
4555 unsigned int align2 = min_align (align, fieldsize * BITS_PER_UNIT);
4557 for (index = lo_index; index <= hi_index; index++)
4559 /* Output the element's initial value. */
4561 assemble_zeros (fieldsize);
4563 output_constant (val, fieldsize, align2);
4565 /* Count its size. */
4566 total_bytes += fieldsize;
4569 else if (field == 0 || !DECL_BIT_FIELD (field))
4571 /* An element that is not a bit-field. */
4573 unsigned HOST_WIDE_INT fieldsize;
4574 /* Since this structure is static,
4575 we know the positions are constant. */
4576 HOST_WIDE_INT pos = field ? int_byte_position (field) : 0;
4577 unsigned int align2;
4580 pos = (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (val)), 1)
4581 * (tree_low_cst (index, 0) - tree_low_cst (min_index, 0)));
4583 /* Output any buffered-up bit-fields preceding this element. */
4584 if (byte_buffer_in_use)
4586 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4588 byte_buffer_in_use = 0;
4591 /* Advance to offset of this element.
4592 Note no alignment needed in an array, since that is guaranteed
4593 if each element has the proper size. */
4594 if ((field != 0 || index != 0) && pos != total_bytes)
4596 gcc_assert (pos >= total_bytes);
4597 assemble_zeros (pos - total_bytes);
4601 /* Find the alignment of this element. */
4602 align2 = min_align (align, BITS_PER_UNIT * pos);
4604 /* Determine size this element should occupy. */
4609 /* If this is an array with an unspecified upper bound,
4610 the initializer determines the size. */
4611 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4612 but we cannot do this until the deprecated support for
4613 initializing zero-length array members is removed. */
4614 if (TREE_CODE (TREE_TYPE (field)) == ARRAY_TYPE
4615 && TYPE_DOMAIN (TREE_TYPE (field))
4616 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (field))))
4618 fieldsize = array_size_for_constructor (val);
4619 /* Given a non-empty initialization, this field had
4621 gcc_assert (!fieldsize || !TREE_CHAIN (field));
4623 else if (DECL_SIZE_UNIT (field))
4625 /* ??? This can't be right. If the decl size overflows
4626 a host integer we will silently emit no data. */
4627 if (host_integerp (DECL_SIZE_UNIT (field), 1))
4628 fieldsize = tree_low_cst (DECL_SIZE_UNIT (field), 1);
4632 fieldsize = int_size_in_bytes (TREE_TYPE (type));
4634 /* Output the element's initial value. */
4636 assemble_zeros (fieldsize);
4638 output_constant (val, fieldsize, align2);
4640 /* Count its size. */
4641 total_bytes += fieldsize;
4643 else if (val != 0 && TREE_CODE (val) != INTEGER_CST)
4644 error ("invalid initial value for member %qs",
4645 IDENTIFIER_POINTER (DECL_NAME (field)));
4648 /* Element that is a bit-field. */
4650 HOST_WIDE_INT next_offset = int_bit_position (field);
4651 HOST_WIDE_INT end_offset
4652 = (next_offset + tree_low_cst (DECL_SIZE (field), 1));
4655 val = integer_zero_node;
4657 /* If this field does not start in this (or, next) byte,
4659 if (next_offset / BITS_PER_UNIT != total_bytes)
4661 /* Output remnant of any bit field in previous bytes. */
4662 if (byte_buffer_in_use)
4664 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4666 byte_buffer_in_use = 0;
4669 /* If still not at proper byte, advance to there. */
4670 if (next_offset / BITS_PER_UNIT != total_bytes)
4672 gcc_assert (next_offset / BITS_PER_UNIT >= total_bytes);
4673 assemble_zeros (next_offset / BITS_PER_UNIT - total_bytes);
4674 total_bytes = next_offset / BITS_PER_UNIT;
4678 if (! byte_buffer_in_use)
4681 /* We must split the element into pieces that fall within
4682 separate bytes, and combine each byte with previous or
4683 following bit-fields. */
4685 /* next_offset is the offset n fbits from the beginning of
4686 the structure to the next bit of this element to be processed.
4687 end_offset is the offset of the first bit past the end of
4689 while (next_offset < end_offset)
4693 HOST_WIDE_INT value;
4694 HOST_WIDE_INT next_byte = next_offset / BITS_PER_UNIT;
4695 HOST_WIDE_INT next_bit = next_offset % BITS_PER_UNIT;
4697 /* Advance from byte to byte
4698 within this element when necessary. */
4699 while (next_byte != total_bytes)
4701 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4706 /* Number of bits we can process at once
4707 (all part of the same byte). */
4708 this_time = MIN (end_offset - next_offset,
4709 BITS_PER_UNIT - next_bit);
4710 if (BYTES_BIG_ENDIAN)
4712 /* On big-endian machine, take the most significant bits
4713 first (of the bits that are significant)
4714 and put them into bytes from the most significant end. */
4715 shift = end_offset - next_offset - this_time;
4717 /* Don't try to take a bunch of bits that cross
4718 the word boundary in the INTEGER_CST. We can
4719 only select bits from the LOW or HIGH part
4721 if (shift < HOST_BITS_PER_WIDE_INT
4722 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4724 this_time = shift + this_time - HOST_BITS_PER_WIDE_INT;
4725 shift = HOST_BITS_PER_WIDE_INT;
4728 /* Now get the bits from the appropriate constant word. */
4729 if (shift < HOST_BITS_PER_WIDE_INT)
4730 value = TREE_INT_CST_LOW (val);
4733 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
4734 value = TREE_INT_CST_HIGH (val);
4735 shift -= HOST_BITS_PER_WIDE_INT;
4738 /* Get the result. This works only when:
4739 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4740 byte |= (((value >> shift)
4741 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
4742 << (BITS_PER_UNIT - this_time - next_bit));
4746 /* On little-endian machines,
4747 take first the least significant bits of the value
4748 and pack them starting at the least significant
4749 bits of the bytes. */
4750 shift = next_offset - int_bit_position (field);
4752 /* Don't try to take a bunch of bits that cross
4753 the word boundary in the INTEGER_CST. We can
4754 only select bits from the LOW or HIGH part
4756 if (shift < HOST_BITS_PER_WIDE_INT
4757 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4758 this_time = (HOST_BITS_PER_WIDE_INT - shift);
4760 /* Now get the bits from the appropriate constant word. */
4761 if (shift < HOST_BITS_PER_WIDE_INT)
4762 value = TREE_INT_CST_LOW (val);
4765 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
4766 value = TREE_INT_CST_HIGH (val);
4767 shift -= HOST_BITS_PER_WIDE_INT;
4770 /* Get the result. This works only when:
4771 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4772 byte |= (((value >> shift)
4773 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
4777 next_offset += this_time;
4778 byte_buffer_in_use = 1;
4783 if (byte_buffer_in_use)
4785 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4789 if ((unsigned HOST_WIDE_INT)total_bytes < size)
4790 assemble_zeros (size - total_bytes);
4793 /* This TREE_LIST contains any weak symbol declarations waiting
4795 static GTY(()) tree weak_decls;
4797 /* Mark DECL as weak. */
4800 mark_weak (tree decl)
4802 DECL_WEAK (decl) = 1;
4804 if (DECL_RTL_SET_P (decl)
4805 && MEM_P (DECL_RTL (decl))
4806 && XEXP (DECL_RTL (decl), 0)
4807 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == SYMBOL_REF)
4808 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl), 0)) = 1;
4811 /* Merge weak status between NEWDECL and OLDDECL. */
4814 merge_weak (tree newdecl, tree olddecl)
4816 if (DECL_WEAK (newdecl) == DECL_WEAK (olddecl))
4818 if (DECL_WEAK (newdecl) && SUPPORTS_WEAK)
4821 /* We put the NEWDECL on the weak_decls list at some point
4822 and OLDDECL as well. Keep just OLDDECL on the list. */
4823 for (pwd = &weak_decls; *pwd; pwd = &TREE_CHAIN (*pwd))
4824 if (TREE_VALUE (*pwd) == newdecl)
4826 *pwd = TREE_CHAIN (*pwd);
4833 if (DECL_WEAK (newdecl))
4837 /* NEWDECL is weak, but OLDDECL is not. */
4839 /* If we already output the OLDDECL, we're in trouble; we can't
4840 go back and make it weak. This error cannot be caught in
4841 declare_weak because the NEWDECL and OLDDECL was not yet
4842 been merged; therefore, TREE_ASM_WRITTEN was not set. */
4843 if (TREE_ASM_WRITTEN (olddecl))
4844 error ("weak declaration of %q+D must precede definition",
4847 /* If we've already generated rtl referencing OLDDECL, we may
4848 have done so in a way that will not function properly with
4850 else if (TREE_USED (olddecl)
4851 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl)))
4852 warning (0, "weak declaration of %q+D after first use results "
4853 "in unspecified behavior", newdecl);
4857 /* We put the NEWDECL on the weak_decls list at some point.
4858 Replace it with the OLDDECL. */
4859 for (wd = weak_decls; wd; wd = TREE_CHAIN (wd))
4860 if (TREE_VALUE (wd) == newdecl)
4862 TREE_VALUE (wd) = olddecl;
4865 /* We may not find the entry on the list. If NEWDECL is a
4866 weak alias, then we will have already called
4867 globalize_decl to remove the entry; in that case, we do
4868 not need to do anything. */
4871 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
4872 mark_weak (olddecl);
4875 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
4876 weak. Just update NEWDECL to indicate that it's weak too. */
4877 mark_weak (newdecl);
4880 /* Declare DECL to be a weak symbol. */
4883 declare_weak (tree decl)
4885 if (! TREE_PUBLIC (decl))
4886 error ("weak declaration of %q+D must be public", decl);
4887 else if (TREE_CODE (decl) == FUNCTION_DECL && TREE_ASM_WRITTEN (decl))
4888 error ("weak declaration of %q+D must precede definition", decl);
4889 else if (SUPPORTS_WEAK)
4891 if (! DECL_WEAK (decl))
4892 weak_decls = tree_cons (NULL, decl, weak_decls);
4895 warning (0, "weak declaration of %q+D not supported", decl);
4901 weak_finish_1 (tree decl)
4903 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
4904 const char *const name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
4907 if (! TREE_USED (decl))
4910 #ifdef ASM_WEAKEN_DECL
4911 ASM_WEAKEN_DECL (asm_out_file, decl, name, NULL);
4913 #ifdef ASM_WEAKEN_LABEL
4914 ASM_WEAKEN_LABEL (asm_out_file, name);
4916 #ifdef ASM_OUTPUT_WEAK_ALIAS
4918 static bool warn_once = 0;
4921 warning (0, "only weak aliases are supported in this configuration");
4931 /* This TREE_LIST contains weakref targets. */
4933 static GTY(()) tree weakref_targets;
4935 /* Forward declaration. */
4936 static tree find_decl_and_mark_needed (tree decl, tree target);
4938 /* Emit any pending weak declarations. */
4945 for (t = weakref_targets; t; t = TREE_CHAIN (t))
4947 tree alias_decl = TREE_PURPOSE (t);
4948 tree target = ultimate_transparent_alias_target (&TREE_VALUE (t));
4950 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl)))
4951 /* Remove alias_decl from the weak list, but leave entries for
4952 the target alone. */
4954 #ifndef ASM_OUTPUT_WEAKREF
4955 else if (! TREE_SYMBOL_REFERENCED (target))
4957 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
4958 defined, otherwise we and weak_finish_1 would use
4959 different macros. */
4960 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
4961 ASM_WEAKEN_LABEL (asm_out_file, IDENTIFIER_POINTER (target));
4963 tree decl = find_decl_and_mark_needed (alias_decl, target);
4967 decl = build_decl (TREE_CODE (alias_decl), target,
4968 TREE_TYPE (alias_decl));
4970 DECL_EXTERNAL (decl) = 1;
4971 TREE_PUBLIC (decl) = 1;
4972 DECL_ARTIFICIAL (decl) = 1;
4973 TREE_NOTHROW (decl) = TREE_NOTHROW (alias_decl);
4974 TREE_USED (decl) = 1;
4977 weak_finish_1 (decl);
4986 /* Remove the alias and the target from the pending weak list
4987 so that we do not emit any .weak directives for the former,
4988 nor multiple .weak directives for the latter. */
4989 for (p = &weak_decls; (t2 = *p) ; )
4991 if (TREE_VALUE (t2) == alias_decl
4992 || target == DECL_ASSEMBLER_NAME (TREE_VALUE (t2)))
4993 *p = TREE_CHAIN (t2);
4995 p = &TREE_CHAIN (t2);
4998 /* Remove other weakrefs to the same target, to speed things up. */
4999 for (p = &TREE_CHAIN (t); (t2 = *p) ; )
5001 if (target == ultimate_transparent_alias_target (&TREE_VALUE (t2)))
5002 *p = TREE_CHAIN (t2);
5004 p = &TREE_CHAIN (t2);
5009 for (t = weak_decls; t; t = TREE_CHAIN (t))
5011 tree decl = TREE_VALUE (t);
5013 weak_finish_1 (decl);
5017 /* Emit the assembly bits to indicate that DECL is globally visible. */
5020 globalize_decl (tree decl)
5023 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5024 if (DECL_WEAK (decl))
5026 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
5029 #ifdef ASM_WEAKEN_DECL
5030 ASM_WEAKEN_DECL (asm_out_file, decl, name, 0);
5032 ASM_WEAKEN_LABEL (asm_out_file, name);
5035 /* Remove this function from the pending weak list so that
5036 we do not emit multiple .weak directives for it. */
5037 for (p = &weak_decls; (t = *p) ; )
5039 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
5040 *p = TREE_CHAIN (t);
5042 p = &TREE_CHAIN (t);
5045 /* Remove weakrefs to the same target from the pending weakref
5046 list, for the same reason. */
5047 for (p = &weakref_targets; (t = *p) ; )
5049 if (DECL_ASSEMBLER_NAME (decl)
5050 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
5051 *p = TREE_CHAIN (t);
5053 p = &TREE_CHAIN (t);
5060 targetm.asm_out.globalize_decl_name (asm_out_file, decl);
5063 /* We have to be able to tell cgraph about the needed-ness of the target
5064 of an alias. This requires that the decl have been defined. Aliases
5065 that precede their definition have to be queued for later processing. */
5067 typedef struct alias_pair GTY(())
5073 /* Define gc'd vector type. */
5074 DEF_VEC_O(alias_pair);
5075 DEF_VEC_ALLOC_O(alias_pair,gc);
5077 static GTY(()) VEC(alias_pair,gc) *alias_pairs;
5079 /* Given an assembly name, find the decl it is associated with. At the
5080 same time, mark it needed for cgraph. */
5083 find_decl_and_mark_needed (tree decl, tree target)
5085 struct cgraph_node *fnode = NULL;
5086 struct varpool_node *vnode = NULL;
5088 if (TREE_CODE (decl) == FUNCTION_DECL)
5090 fnode = cgraph_node_for_asm (target);
5092 vnode = varpool_node_for_asm (target);
5096 vnode = varpool_node_for_asm (target);
5098 fnode = cgraph_node_for_asm (target);
5103 /* We can't mark function nodes as used after cgraph global info
5104 is finished. This wouldn't generally be necessary, but C++
5105 virtual table thunks are introduced late in the game and
5106 might seem like they need marking, although in fact they
5108 if (! cgraph_global_info_ready)
5109 cgraph_mark_needed_node (fnode);
5114 varpool_mark_needed_node (vnode);
5121 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5122 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5123 tree node is DECL to have the value of the tree node TARGET. */
5126 do_assemble_alias (tree decl, tree target)
5128 if (TREE_ASM_WRITTEN (decl))
5131 TREE_ASM_WRITTEN (decl) = 1;
5132 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl)) = 1;
5134 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
5136 ultimate_transparent_alias_target (&target);
5138 if (!targetm.have_tls
5139 && TREE_CODE (decl) == VAR_DECL
5140 && DECL_THREAD_LOCAL_P (decl))
5142 decl = emutls_decl (decl);
5143 target = get_emutls_object_name (target);
5146 if (!TREE_SYMBOL_REFERENCED (target))
5147 weakref_targets = tree_cons (decl, target, weakref_targets);
5149 #ifdef ASM_OUTPUT_WEAKREF
5150 ASM_OUTPUT_WEAKREF (asm_out_file, decl,
5151 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
5152 IDENTIFIER_POINTER (target));
5156 error ("%Jweakref is not supported in this configuration", decl);
5163 if (!targetm.have_tls
5164 && TREE_CODE (decl) == VAR_DECL
5165 && DECL_THREAD_LOCAL_P (decl))
5167 decl = emutls_decl (decl);
5168 target = get_emutls_object_name (target);
5171 #ifdef ASM_OUTPUT_DEF
5172 /* Make name accessible from other files, if appropriate. */
5174 if (TREE_PUBLIC (decl))
5176 globalize_decl (decl);
5177 maybe_assemble_visibility (decl);
5180 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5181 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file, decl, target);
5183 ASM_OUTPUT_DEF (asm_out_file,
5184 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
5185 IDENTIFIER_POINTER (target));
5187 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5192 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5193 # ifdef ASM_WEAKEN_DECL
5194 ASM_WEAKEN_DECL (asm_out_file, decl, name, IDENTIFIER_POINTER (target));
5196 ASM_OUTPUT_WEAK_ALIAS (asm_out_file, name, IDENTIFIER_POINTER (target));
5198 /* Remove this function from the pending weak list so that
5199 we do not emit multiple .weak directives for it. */
5200 for (p = &weak_decls; (t = *p) ; )
5201 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
5202 *p = TREE_CHAIN (t);
5204 p = &TREE_CHAIN (t);
5206 /* Remove weakrefs to the same target from the pending weakref
5207 list, for the same reason. */
5208 for (p = &weakref_targets; (t = *p) ; )
5210 if (DECL_ASSEMBLER_NAME (decl)
5211 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
5212 *p = TREE_CHAIN (t);
5214 p = &TREE_CHAIN (t);
5220 /* First pass of completing pending aliases. Make sure that cgraph knows
5221 which symbols will be required. */
5224 finish_aliases_1 (void)
5229 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); i++)
5233 target_decl = find_decl_and_mark_needed (p->decl, p->target);
5234 if (target_decl == NULL)
5236 if (! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
5237 error ("%q+D aliased to undefined symbol %qs",
5238 p->decl, IDENTIFIER_POINTER (p->target));
5240 else if (DECL_EXTERNAL (target_decl)
5241 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
5242 error ("%q+D aliased to external symbol %qs",
5243 p->decl, IDENTIFIER_POINTER (p->target));
5247 /* Second pass of completing pending aliases. Emit the actual assembly.
5248 This happens at the end of compilation and thus it is assured that the
5249 target symbol has been emitted. */
5252 finish_aliases_2 (void)
5257 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); i++)
5258 do_assemble_alias (p->decl, p->target);
5260 VEC_truncate (alias_pair, alias_pairs, 0);
5263 /* Emit an assembler directive to make the symbol for DECL an alias to
5264 the symbol for TARGET. */
5267 assemble_alias (tree decl, tree target)
5270 bool is_weakref = false;
5272 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
5274 tree alias = DECL_ASSEMBLER_NAME (decl);
5278 ultimate_transparent_alias_target (&target);
5280 if (alias == target)
5281 error ("weakref %q+D ultimately targets itself", decl);
5284 #ifndef ASM_OUTPUT_WEAKREF
5285 IDENTIFIER_TRANSPARENT_ALIAS (alias) = 1;
5286 TREE_CHAIN (alias) = target;
5289 if (TREE_PUBLIC (decl))
5290 error ("weakref %q+D must have static linkage", decl);
5294 #if !defined (ASM_OUTPUT_DEF)
5295 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5296 error ("%Jalias definitions not supported in this configuration", decl);
5299 if (!DECL_WEAK (decl))
5301 error ("%Jonly weak aliases are supported in this configuration", decl);
5308 /* We must force creation of DECL_RTL for debug info generation, even though
5309 we don't use it here. */
5310 make_decl_rtl (decl);
5311 TREE_USED (decl) = 1;
5313 /* A quirk of the initial implementation of aliases required that the user
5314 add "extern" to all of them. Which is silly, but now historical. Do
5315 note that the symbol is in fact locally defined. */
5317 DECL_EXTERNAL (decl) = 0;
5319 /* Allow aliases to aliases. */
5320 if (TREE_CODE (decl) == FUNCTION_DECL)
5321 cgraph_node (decl)->alias = true;
5323 varpool_node (decl)->alias = true;
5325 /* If the target has already been emitted, we don't have to queue the
5326 alias. This saves a tad of memory. */
5327 target_decl = find_decl_and_mark_needed (decl, target);
5328 if (target_decl && TREE_ASM_WRITTEN (target_decl))
5329 do_assemble_alias (decl, target);
5332 alias_pair *p = VEC_safe_push (alias_pair, gc, alias_pairs, NULL);
5338 /* Emit an assembler directive to set symbol for DECL visibility to
5339 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5342 default_assemble_visibility (tree decl, int vis)
5344 static const char * const visibility_types[] = {
5345 NULL, "protected", "hidden", "internal"
5348 const char *name, *type;
5350 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5351 type = visibility_types[vis];
5353 #ifdef HAVE_GAS_HIDDEN
5354 fprintf (asm_out_file, "\t.%s\t", type);
5355 assemble_name (asm_out_file, name);
5356 fprintf (asm_out_file, "\n");
5358 warning (OPT_Wattributes, "visibility attribute not supported "
5359 "in this configuration; ignored");
5363 /* A helper function to call assemble_visibility when needed for a decl. */
5366 maybe_assemble_visibility (tree decl)
5368 enum symbol_visibility vis = DECL_VISIBILITY (decl);
5370 if (vis != VISIBILITY_DEFAULT)
5372 targetm.asm_out.visibility (decl, vis);
5379 /* Returns 1 if the target configuration supports defining public symbols
5380 so that one of them will be chosen at link time instead of generating a
5381 multiply-defined symbol error, whether through the use of weak symbols or
5382 a target-specific mechanism for having duplicates discarded. */
5385 supports_one_only (void)
5387 if (SUPPORTS_ONE_ONLY)
5389 return SUPPORTS_WEAK;
5392 /* Set up DECL as a public symbol that can be defined in multiple
5393 translation units without generating a linker error. */
5396 make_decl_one_only (tree decl)
5398 gcc_assert (TREE_CODE (decl) == VAR_DECL
5399 || TREE_CODE (decl) == FUNCTION_DECL);
5401 TREE_PUBLIC (decl) = 1;
5403 if (SUPPORTS_ONE_ONLY)
5405 #ifdef MAKE_DECL_ONE_ONLY
5406 MAKE_DECL_ONE_ONLY (decl);
5408 DECL_ONE_ONLY (decl) = 1;
5410 else if (TREE_CODE (decl) == VAR_DECL
5411 && (DECL_INITIAL (decl) == 0 || DECL_INITIAL (decl) == error_mark_node))
5412 DECL_COMMON (decl) = 1;
5415 gcc_assert (SUPPORTS_WEAK);
5416 DECL_WEAK (decl) = 1;
5421 init_varasm_once (void)
5423 section_htab = htab_create_ggc (31, section_entry_hash,
5424 section_entry_eq, NULL);
5425 object_block_htab = htab_create_ggc (31, object_block_entry_hash,
5426 object_block_entry_eq, NULL);
5427 const_desc_htab = htab_create_ggc (1009, const_desc_hash,
5428 const_desc_eq, NULL);
5430 const_alias_set = new_alias_set ();
5431 shared_constant_pool = create_constant_pool ();
5433 #ifdef TEXT_SECTION_ASM_OP
5434 text_section = get_unnamed_section (SECTION_CODE, output_section_asm_op,
5435 TEXT_SECTION_ASM_OP);
5438 #ifdef DATA_SECTION_ASM_OP
5439 data_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
5440 DATA_SECTION_ASM_OP);
5443 #ifdef SDATA_SECTION_ASM_OP
5444 sdata_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
5445 SDATA_SECTION_ASM_OP);
5448 #ifdef READONLY_DATA_SECTION_ASM_OP
5449 readonly_data_section = get_unnamed_section (0, output_section_asm_op,
5450 READONLY_DATA_SECTION_ASM_OP);
5453 #ifdef CTORS_SECTION_ASM_OP
5454 ctors_section = get_unnamed_section (0, output_section_asm_op,
5455 CTORS_SECTION_ASM_OP);
5458 #ifdef DTORS_SECTION_ASM_OP
5459 dtors_section = get_unnamed_section (0, output_section_asm_op,
5460 DTORS_SECTION_ASM_OP);
5463 #ifdef BSS_SECTION_ASM_OP
5464 bss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
5465 output_section_asm_op,
5466 BSS_SECTION_ASM_OP);
5469 #ifdef SBSS_SECTION_ASM_OP
5470 sbss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
5471 output_section_asm_op,
5472 SBSS_SECTION_ASM_OP);
5475 tls_comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5476 | SECTION_COMMON, emit_tls_common);
5477 lcomm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5478 | SECTION_COMMON, emit_local);
5479 comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5480 | SECTION_COMMON, emit_common);
5482 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
5483 bss_noswitch_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS,
5487 targetm.asm_out.init_sections ();
5489 if (readonly_data_section == NULL)
5490 readonly_data_section = text_section;
5494 decl_default_tls_model (const_tree decl)
5496 enum tls_model kind;
5499 is_local = targetm.binds_local_p (decl);
5503 kind = TLS_MODEL_LOCAL_EXEC;
5505 kind = TLS_MODEL_INITIAL_EXEC;
5508 /* Local dynamic is inefficient when we're not combining the
5509 parts of the address. */
5510 else if (optimize && is_local)
5511 kind = TLS_MODEL_LOCAL_DYNAMIC;
5513 kind = TLS_MODEL_GLOBAL_DYNAMIC;
5514 if (kind < flag_tls_default)
5515 kind = flag_tls_default;
5520 /* Select a set of attributes for section NAME based on the properties
5521 of DECL and whether or not RELOC indicates that DECL's initializer
5522 might contain runtime relocations.
5524 We make the section read-only and executable for a function decl,
5525 read-only for a const data decl, and writable for a non-const data decl. */
5528 default_section_type_flags (tree decl, const char *name, int reloc)
5532 if (decl && TREE_CODE (decl) == FUNCTION_DECL)
5533 flags = SECTION_CODE;
5534 else if (decl && decl_readonly_section (decl, reloc))
5536 else if (current_function_decl
5538 && crtl->subsections.unlikely_text_section_name
5539 && strcmp (name, crtl->subsections.unlikely_text_section_name) == 0)
5540 flags = SECTION_CODE;
5542 && (!current_function_decl || !cfun)
5543 && strcmp (name, UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
5544 flags = SECTION_CODE;
5546 flags = SECTION_WRITE;
5548 if (decl && DECL_ONE_ONLY (decl))
5549 flags |= SECTION_LINKONCE;
5551 if (decl && TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
5552 flags |= SECTION_TLS | SECTION_WRITE;
5554 if (strcmp (name, ".bss") == 0
5555 || strncmp (name, ".bss.", 5) == 0
5556 || strncmp (name, ".gnu.linkonce.b.", 16) == 0
5557 || strcmp (name, ".sbss") == 0
5558 || strncmp (name, ".sbss.", 6) == 0
5559 || strncmp (name, ".gnu.linkonce.sb.", 17) == 0)
5560 flags |= SECTION_BSS;
5562 if (strcmp (name, ".tdata") == 0
5563 || strncmp (name, ".tdata.", 7) == 0
5564 || strncmp (name, ".gnu.linkonce.td.", 17) == 0)
5565 flags |= SECTION_TLS;
5567 if (strcmp (name, ".tbss") == 0
5568 || strncmp (name, ".tbss.", 6) == 0
5569 || strncmp (name, ".gnu.linkonce.tb.", 17) == 0)
5570 flags |= SECTION_TLS | SECTION_BSS;
5572 /* These three sections have special ELF types. They are neither
5573 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
5574 want to print a section type (@progbits or @nobits). If someone
5575 is silly enough to emit code or TLS variables to one of these
5576 sections, then don't handle them specially. */
5577 if (!(flags & (SECTION_CODE | SECTION_BSS | SECTION_TLS))
5578 && (strcmp (name, ".init_array") == 0
5579 || strcmp (name, ".fini_array") == 0
5580 || strcmp (name, ".preinit_array") == 0))
5581 flags |= SECTION_NOTYPE;
5586 /* Return true if the target supports some form of global BSS,
5587 either through bss_noswitch_section, or by selecting a BSS
5588 section in TARGET_ASM_SELECT_SECTION. */
5591 have_global_bss_p (void)
5593 return bss_noswitch_section || targetm.have_switchable_bss_sections;
5596 /* Output assembly to switch to section NAME with attribute FLAGS.
5597 Four variants for common object file formats. */
5600 default_no_named_section (const char *name ATTRIBUTE_UNUSED,
5601 unsigned int flags ATTRIBUTE_UNUSED,
5602 tree decl ATTRIBUTE_UNUSED)
5604 /* Some object formats don't support named sections at all. The
5605 front-end should already have flagged this as an error. */
5610 default_elf_asm_named_section (const char *name, unsigned int flags,
5611 tree decl ATTRIBUTE_UNUSED)
5613 char flagchars[10], *f = flagchars;
5615 /* If we have already declared this section, we can use an
5616 abbreviated form to switch back to it -- unless this section is
5617 part of a COMDAT groups, in which case GAS requires the full
5618 declaration every time. */
5619 if (!(HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5620 && (flags & SECTION_DECLARED))
5622 fprintf (asm_out_file, "\t.section\t%s\n", name);
5626 if (!(flags & SECTION_DEBUG))
5628 if (flags & SECTION_WRITE)
5630 if (flags & SECTION_CODE)
5632 if (flags & SECTION_SMALL)
5634 if (flags & SECTION_MERGE)
5636 if (flags & SECTION_STRINGS)
5638 if (flags & SECTION_TLS)
5640 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5644 fprintf (asm_out_file, "\t.section\t%s,\"%s\"", name, flagchars);
5646 if (!(flags & SECTION_NOTYPE))
5651 if (flags & SECTION_BSS)
5657 #ifdef ASM_COMMENT_START
5658 /* On platforms that use "@" as the assembly comment character,
5660 if (strcmp (ASM_COMMENT_START, "@") == 0)
5663 fprintf (asm_out_file, format, type);
5665 if (flags & SECTION_ENTSIZE)
5666 fprintf (asm_out_file, ",%d", flags & SECTION_ENTSIZE);
5667 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5668 fprintf (asm_out_file, ",%s,comdat",
5669 lang_hooks.decls.comdat_group (decl));
5672 putc ('\n', asm_out_file);
5676 default_coff_asm_named_section (const char *name, unsigned int flags,
5677 tree decl ATTRIBUTE_UNUSED)
5679 char flagchars[8], *f = flagchars;
5681 if (flags & SECTION_WRITE)
5683 if (flags & SECTION_CODE)
5687 fprintf (asm_out_file, "\t.section\t%s,\"%s\"\n", name, flagchars);
5691 default_pe_asm_named_section (const char *name, unsigned int flags,
5694 default_coff_asm_named_section (name, flags, decl);
5696 if (flags & SECTION_LINKONCE)
5698 /* Functions may have been compiled at various levels of
5699 optimization so we can't use `same_size' here.
5700 Instead, have the linker pick one. */
5701 fprintf (asm_out_file, "\t.linkonce %s\n",
5702 (flags & SECTION_CODE ? "discard" : "same_size"));
5706 /* The lame default section selector. */
5709 default_select_section (tree decl, int reloc,
5710 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
5714 if (decl_readonly_section (decl, reloc))
5715 return readonly_data_section;
5717 else if (TREE_CODE (decl) == CONSTRUCTOR)
5719 if (! ((flag_pic && reloc)
5720 || !TREE_READONLY (decl)
5721 || TREE_SIDE_EFFECTS (decl)
5722 || !TREE_CONSTANT (decl)))
5723 return readonly_data_section;
5725 else if (TREE_CODE (decl) == STRING_CST)
5726 return readonly_data_section;
5727 else if (! (flag_pic && reloc))
5728 return readonly_data_section;
5730 return data_section;
5733 enum section_category
5734 categorize_decl_for_section (const_tree decl, int reloc)
5736 enum section_category ret;
5738 if (TREE_CODE (decl) == FUNCTION_DECL)
5740 else if (TREE_CODE (decl) == STRING_CST)
5742 if (flag_mudflap) /* or !flag_merge_constants */
5743 return SECCAT_RODATA;
5745 return SECCAT_RODATA_MERGE_STR;
5747 else if (TREE_CODE (decl) == VAR_DECL)
5749 if (bss_initializer_p (decl))
5751 else if (! TREE_READONLY (decl)
5752 || TREE_SIDE_EFFECTS (decl)
5753 || ! TREE_CONSTANT (DECL_INITIAL (decl)))
5755 /* Here the reloc_rw_mask is not testing whether the section should
5756 be read-only or not, but whether the dynamic link will have to
5757 do something. If so, we wish to segregate the data in order to
5758 minimize cache misses inside the dynamic linker. */
5759 if (reloc & targetm.asm_out.reloc_rw_mask ())
5760 ret = reloc == 1 ? SECCAT_DATA_REL_LOCAL : SECCAT_DATA_REL;
5764 else if (reloc & targetm.asm_out.reloc_rw_mask ())
5765 ret = reloc == 1 ? SECCAT_DATA_REL_RO_LOCAL : SECCAT_DATA_REL_RO;
5766 else if (reloc || flag_merge_constants < 2)
5767 /* C and C++ don't allow different variables to share the same
5768 location. -fmerge-all-constants allows even that (at the
5769 expense of not conforming). */
5770 ret = SECCAT_RODATA;
5771 else if (TREE_CODE (DECL_INITIAL (decl)) == STRING_CST)
5772 ret = SECCAT_RODATA_MERGE_STR_INIT;
5774 ret = SECCAT_RODATA_MERGE_CONST;
5776 else if (TREE_CODE (decl) == CONSTRUCTOR)
5778 if ((reloc & targetm.asm_out.reloc_rw_mask ())
5779 || TREE_SIDE_EFFECTS (decl)
5780 || ! TREE_CONSTANT (decl))
5783 ret = SECCAT_RODATA;
5786 ret = SECCAT_RODATA;
5788 /* There are no read-only thread-local sections. */
5789 if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
5791 /* Note that this would be *just* SECCAT_BSS, except that there's
5792 no concept of a read-only thread-local-data section. */
5793 if (ret == SECCAT_BSS
5794 || (flag_zero_initialized_in_bss
5795 && initializer_zerop (DECL_INITIAL (decl))))
5801 /* If the target uses small data sections, select it. */
5802 else if (targetm.in_small_data_p (decl))
5804 if (ret == SECCAT_BSS)
5806 else if (targetm.have_srodata_section && ret == SECCAT_RODATA)
5807 ret = SECCAT_SRODATA;
5816 decl_readonly_section (const_tree decl, int reloc)
5818 switch (categorize_decl_for_section (decl, reloc))
5821 case SECCAT_RODATA_MERGE_STR:
5822 case SECCAT_RODATA_MERGE_STR_INIT:
5823 case SECCAT_RODATA_MERGE_CONST:
5824 case SECCAT_SRODATA:
5833 /* Select a section based on the above categorization. */
5836 default_elf_select_section (tree decl, int reloc,
5837 unsigned HOST_WIDE_INT align)
5840 switch (categorize_decl_for_section (decl, reloc))
5843 /* We're not supposed to be called on FUNCTION_DECLs. */
5846 return readonly_data_section;
5847 case SECCAT_RODATA_MERGE_STR:
5848 return mergeable_string_section (decl, align, 0);
5849 case SECCAT_RODATA_MERGE_STR_INIT:
5850 return mergeable_string_section (DECL_INITIAL (decl), align, 0);
5851 case SECCAT_RODATA_MERGE_CONST:
5852 return mergeable_constant_section (DECL_MODE (decl), align, 0);
5853 case SECCAT_SRODATA:
5857 return data_section;
5858 case SECCAT_DATA_REL:
5859 sname = ".data.rel";
5861 case SECCAT_DATA_REL_LOCAL:
5862 sname = ".data.rel.local";
5864 case SECCAT_DATA_REL_RO:
5865 sname = ".data.rel.ro";
5867 case SECCAT_DATA_REL_RO_LOCAL:
5868 sname = ".data.rel.ro.local";
5893 return get_named_section (decl, sname, reloc);
5896 /* Construct a unique section name based on the decl name and the
5897 categorization performed above. */
5900 default_unique_section (tree decl, int reloc)
5902 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
5903 bool one_only = DECL_ONE_ONLY (decl) && !HAVE_COMDAT_GROUP;
5904 const char *prefix, *name;
5908 switch (categorize_decl_for_section (decl, reloc))
5911 prefix = one_only ? ".gnu.linkonce.t." : ".text.";
5914 case SECCAT_RODATA_MERGE_STR:
5915 case SECCAT_RODATA_MERGE_STR_INIT:
5916 case SECCAT_RODATA_MERGE_CONST:
5917 prefix = one_only ? ".gnu.linkonce.r." : ".rodata.";
5919 case SECCAT_SRODATA:
5920 prefix = one_only ? ".gnu.linkonce.s2." : ".sdata2.";
5923 prefix = one_only ? ".gnu.linkonce.d." : ".data.";
5925 case SECCAT_DATA_REL:
5926 prefix = one_only ? ".gnu.linkonce.d.rel." : ".data.rel.";
5928 case SECCAT_DATA_REL_LOCAL:
5929 prefix = one_only ? ".gnu.linkonce.d.rel.local." : ".data.rel.local.";
5931 case SECCAT_DATA_REL_RO:
5932 prefix = one_only ? ".gnu.linkonce.d.rel.ro." : ".data.rel.ro.";
5934 case SECCAT_DATA_REL_RO_LOCAL:
5935 prefix = one_only ? ".gnu.linkonce.d.rel.ro.local."
5936 : ".data.rel.ro.local.";
5939 prefix = one_only ? ".gnu.linkonce.s." : ".sdata.";
5942 prefix = one_only ? ".gnu.linkonce.b." : ".bss.";
5945 prefix = one_only ? ".gnu.linkonce.sb." : ".sbss.";
5948 prefix = one_only ? ".gnu.linkonce.td." : ".tdata.";
5951 prefix = one_only ? ".gnu.linkonce.tb." : ".tbss.";
5956 plen = strlen (prefix);
5958 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5959 name = targetm.strip_name_encoding (name);
5960 nlen = strlen (name);
5962 string = alloca (nlen + plen + 1);
5963 memcpy (string, prefix, plen);
5964 memcpy (string + plen, name, nlen + 1);
5966 DECL_SECTION_NAME (decl) = build_string (nlen + plen, string);
5969 /* Like compute_reloc_for_constant, except for an RTX. The return value
5970 is a mask for which bit 1 indicates a global relocation, and bit 0
5971 indicates a local relocation. */
5974 compute_reloc_for_rtx_1 (rtx *xp, void *data)
5979 switch (GET_CODE (x))
5982 *preloc |= SYMBOL_REF_LOCAL_P (x) ? 1 : 2;
5995 compute_reloc_for_rtx (rtx x)
5999 switch (GET_CODE (x))
6005 for_each_rtx (&x, compute_reloc_for_rtx_1, &reloc);
6014 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED,
6016 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
6018 if (compute_reloc_for_rtx (x) & targetm.asm_out.reloc_rw_mask ())
6019 return data_section;
6021 return readonly_data_section;
6025 default_elf_select_rtx_section (enum machine_mode mode, rtx x,
6026 unsigned HOST_WIDE_INT align)
6028 int reloc = compute_reloc_for_rtx (x);
6030 /* ??? Handle small data here somehow. */
6032 if (reloc & targetm.asm_out.reloc_rw_mask ())
6035 return get_named_section (NULL, ".data.rel.ro.local", 1);
6037 return get_named_section (NULL, ".data.rel.ro", 3);
6040 return mergeable_constant_section (mode, align, 0);
6043 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6046 default_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
6051 /* Careful not to prod global register variables. */
6054 symbol = XEXP (rtl, 0);
6055 if (GET_CODE (symbol) != SYMBOL_REF)
6058 flags = SYMBOL_REF_FLAGS (symbol) & SYMBOL_FLAG_HAS_BLOCK_INFO;
6059 if (TREE_CODE (decl) == FUNCTION_DECL)
6060 flags |= SYMBOL_FLAG_FUNCTION;
6061 if (targetm.binds_local_p (decl))
6062 flags |= SYMBOL_FLAG_LOCAL;
6063 if (targetm.have_tls && TREE_CODE (decl) == VAR_DECL
6064 && DECL_THREAD_LOCAL_P (decl))
6065 flags |= DECL_TLS_MODEL (decl) << SYMBOL_FLAG_TLS_SHIFT;
6066 else if (targetm.in_small_data_p (decl))
6067 flags |= SYMBOL_FLAG_SMALL;
6068 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6069 being PUBLIC, the thing *must* be defined in this translation unit.
6070 Prevent this buglet from being propagated into rtl code as well. */
6071 if (DECL_P (decl) && DECL_EXTERNAL (decl) && TREE_PUBLIC (decl))
6072 flags |= SYMBOL_FLAG_EXTERNAL;
6074 SYMBOL_REF_FLAGS (symbol) = flags;
6077 /* By default, we do nothing for encode_section_info, so we need not
6078 do anything but discard the '*' marker. */
6081 default_strip_name_encoding (const char *str)
6083 return str + (*str == '*');
6086 #ifdef ASM_OUTPUT_DEF
6087 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6088 anchor relative to ".", the current section position. */
6091 default_asm_output_anchor (rtx symbol)
6095 sprintf (buffer, "*. + " HOST_WIDE_INT_PRINT_DEC,
6096 SYMBOL_REF_BLOCK_OFFSET (symbol));
6097 ASM_OUTPUT_DEF (asm_out_file, XSTR (symbol, 0), buffer);
6101 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6104 default_use_anchors_for_symbol_p (const_rtx symbol)
6109 /* Don't use anchors for mergeable sections. The linker might move
6110 the objects around. */
6111 sect = SYMBOL_REF_BLOCK (symbol)->sect;
6112 if (sect->common.flags & SECTION_MERGE)
6115 /* Don't use anchors for small data sections. The small data register
6116 acts as an anchor for such sections. */
6117 if (sect->common.flags & SECTION_SMALL)
6120 decl = SYMBOL_REF_DECL (symbol);
6121 if (decl && DECL_P (decl))
6123 /* Don't use section anchors for decls that might be defined by
6125 if (!targetm.binds_local_p (decl))
6128 /* Don't use section anchors for decls that will be placed in a
6129 small data section. */
6130 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6131 one above. The problem is that we only use SECTION_SMALL for
6132 sections that should be marked as small in the section directive. */
6133 if (targetm.in_small_data_p (decl))
6139 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6140 wrt cross-module name binding. */
6143 default_binds_local_p (const_tree exp)
6145 return default_binds_local_p_1 (exp, flag_shlib);
6149 default_binds_local_p_1 (const_tree exp, int shlib)
6153 /* A non-decl is an entry in the constant pool. */
6156 /* Weakrefs may not bind locally, even though the weakref itself is
6157 always static and therefore local. */
6158 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp)))
6160 /* Static variables are always local. */
6161 else if (! TREE_PUBLIC (exp))
6163 /* A variable is local if the user has said explicitly that it will
6165 else if (DECL_VISIBILITY_SPECIFIED (exp)
6166 && DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
6168 /* Variables defined outside this object might not be local. */
6169 else if (DECL_EXTERNAL (exp))
6171 /* If defined in this object and visibility is not default, must be
6173 else if (DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
6175 /* Default visibility weak data can be overridden by a strong symbol
6176 in another module and so are not local. */
6177 else if (DECL_WEAK (exp))
6179 /* If PIC, then assume that any global name can be overridden by
6180 symbols resolved from other modules, unless we are compiling with
6181 -fwhole-program, which assumes that names are local. */
6183 local_p = flag_whole_program;
6184 /* Uninitialized COMMON variable may be unified with symbols
6185 resolved from other modules. */
6186 else if (DECL_COMMON (exp)
6187 && (DECL_INITIAL (exp) == NULL
6188 || DECL_INITIAL (exp) == error_mark_node))
6190 /* Otherwise we're left with initialized (or non-common) global data
6191 which is of necessity defined locally. */
6198 /* Determine whether or not a pointer mode is valid. Assume defaults
6199 of ptr_mode or Pmode - can be overridden. */
6201 default_valid_pointer_mode (enum machine_mode mode)
6203 return (mode == ptr_mode || mode == Pmode);
6206 /* Default function to output code that will globalize a label. A
6207 target must define GLOBAL_ASM_OP or provide its own function to
6208 globalize a label. */
6209 #ifdef GLOBAL_ASM_OP
6211 default_globalize_label (FILE * stream, const char *name)
6213 fputs (GLOBAL_ASM_OP, stream);
6214 assemble_name (stream, name);
6215 putc ('\n', stream);
6217 #endif /* GLOBAL_ASM_OP */
6219 /* Default function to output code that will globalize a declaration. */
6221 default_globalize_decl_name (FILE * stream, tree decl)
6223 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
6224 targetm.asm_out.globalize_label (stream, name);
6227 /* Default function to output a label for unwind information. The
6228 default is to do nothing. A target that needs nonlocal labels for
6229 unwind information must provide its own function to do this. */
6231 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED,
6232 tree decl ATTRIBUTE_UNUSED,
6233 int for_eh ATTRIBUTE_UNUSED,
6234 int empty ATTRIBUTE_UNUSED)
6238 /* Default function to output a label to divide up the exception table.
6239 The default is to do nothing. A target that needs/wants to divide
6240 up the table must provide it's own function to do this. */
6242 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED)
6246 /* This is how to output an internal numbered label where PREFIX is
6247 the class of label and LABELNO is the number within the class. */
6250 default_internal_label (FILE *stream, const char *prefix,
6251 unsigned long labelno)
6253 char *const buf = alloca (40 + strlen (prefix));
6254 ASM_GENERATE_INTERNAL_LABEL (buf, prefix, labelno);
6255 ASM_OUTPUT_INTERNAL_LABEL (stream, buf);
6258 /* This is the default behavior at the beginning of a file. It's
6259 controlled by two other target-hook toggles. */
6261 default_file_start (void)
6263 if (targetm.file_start_app_off && !flag_verbose_asm)
6264 fputs (ASM_APP_OFF, asm_out_file);
6266 if (targetm.file_start_file_directive)
6267 output_file_directive (asm_out_file, main_input_filename);
6270 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6271 which emits a special section directive used to indicate whether or
6272 not this object file needs an executable stack. This is primarily
6273 a GNU extension to ELF but could be used on other targets. */
6275 int trampolines_created;
6278 file_end_indicate_exec_stack (void)
6280 unsigned int flags = SECTION_DEBUG;
6281 if (trampolines_created)
6282 flags |= SECTION_CODE;
6284 switch_to_section (get_section (".note.GNU-stack", flags, NULL));
6287 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6288 a get_unnamed_section callback. */
6291 output_section_asm_op (const void *directive)
6293 fprintf (asm_out_file, "%s\n", (const char *) directive);
6296 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6297 the current section is NEW_SECTION. */
6300 switch_to_section (section *new_section)
6302 if (in_section == new_section)
6305 if (new_section->common.flags & SECTION_FORGET)
6308 in_section = new_section;
6310 switch (SECTION_STYLE (new_section))
6314 && !crtl->subsections.unlikely_text_section_name
6315 && strcmp (new_section->named.name,
6316 UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
6317 crtl->subsections.unlikely_text_section_name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
6319 targetm.asm_out.named_section (new_section->named.name,
6320 new_section->named.common.flags,
6321 new_section->named.decl);
6324 case SECTION_UNNAMED:
6325 new_section->unnamed.callback (new_section->unnamed.data);
6328 case SECTION_NOSWITCH:
6333 new_section->common.flags |= SECTION_DECLARED;
6336 /* If block symbol SYMBOL has not yet been assigned an offset, place
6337 it at the end of its block. */
6340 place_block_symbol (rtx symbol)
6342 unsigned HOST_WIDE_INT size, mask, offset;
6343 struct constant_descriptor_rtx *desc;
6344 unsigned int alignment;
6345 struct object_block *block;
6348 gcc_assert (SYMBOL_REF_BLOCK (symbol));
6349 if (SYMBOL_REF_BLOCK_OFFSET (symbol) >= 0)
6352 /* Work out the symbol's size and alignment. */
6353 if (CONSTANT_POOL_ADDRESS_P (symbol))
6355 desc = SYMBOL_REF_CONSTANT (symbol);
6356 alignment = desc->align;
6357 size = GET_MODE_SIZE (desc->mode);
6359 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
6361 decl = SYMBOL_REF_DECL (symbol);
6362 alignment = get_constant_alignment (decl);
6363 size = get_constant_size (decl);
6367 decl = SYMBOL_REF_DECL (symbol);
6368 alignment = DECL_ALIGN (decl);
6369 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
6372 /* Calculate the object's offset from the start of the block. */
6373 block = SYMBOL_REF_BLOCK (symbol);
6374 mask = alignment / BITS_PER_UNIT - 1;
6375 offset = (block->size + mask) & ~mask;
6376 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
6378 /* Record the block's new alignment and size. */
6379 block->alignment = MAX (block->alignment, alignment);
6380 block->size = offset + size;
6382 VEC_safe_push (rtx, gc, block->objects, symbol);
6385 /* Return the anchor that should be used to address byte offset OFFSET
6386 from the first object in BLOCK. MODEL is the TLS model used
6390 get_section_anchor (struct object_block *block, HOST_WIDE_INT offset,
6391 enum tls_model model)
6394 unsigned int begin, middle, end;
6395 unsigned HOST_WIDE_INT min_offset, max_offset, range, bias, delta;
6398 /* Work out the anchor's offset. Use an offset of 0 for the first
6399 anchor so that we don't pessimize the case where we take the address
6400 of a variable at the beginning of the block. This is particularly
6401 useful when a block has only one variable assigned to it.
6403 We try to place anchors RANGE bytes apart, so there can then be
6404 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
6405 a ptr_mode offset. With some target settings, the lowest such
6406 anchor might be out of range for the lowest ptr_mode offset;
6407 likewise the highest anchor for the highest offset. Use anchors
6408 at the extreme ends of the ptr_mode range in such cases.
6410 All arithmetic uses unsigned integers in order to avoid
6412 max_offset = (unsigned HOST_WIDE_INT) targetm.max_anchor_offset;
6413 min_offset = (unsigned HOST_WIDE_INT) targetm.min_anchor_offset;
6414 range = max_offset - min_offset + 1;
6419 bias = 1 << (GET_MODE_BITSIZE (ptr_mode) - 1);
6422 delta = -(unsigned HOST_WIDE_INT) offset + max_offset;
6423 delta -= delta % range;
6426 offset = (HOST_WIDE_INT) (-delta);
6430 delta = (unsigned HOST_WIDE_INT) offset - min_offset;
6431 delta -= delta % range;
6432 if (delta > bias - 1)
6434 offset = (HOST_WIDE_INT) delta;
6438 /* Do a binary search to see if there's already an anchor we can use.
6439 Set BEGIN to the new anchor's index if not. */
6441 end = VEC_length (rtx, block->anchors);
6442 while (begin != end)
6444 middle = (end + begin) / 2;
6445 anchor = VEC_index (rtx, block->anchors, middle);
6446 if (SYMBOL_REF_BLOCK_OFFSET (anchor) > offset)
6448 else if (SYMBOL_REF_BLOCK_OFFSET (anchor) < offset)
6450 else if (SYMBOL_REF_TLS_MODEL (anchor) > model)
6452 else if (SYMBOL_REF_TLS_MODEL (anchor) < model)
6458 /* Create a new anchor with a unique label. */
6459 ASM_GENERATE_INTERNAL_LABEL (label, "LANCHOR", anchor_labelno++);
6460 anchor = create_block_symbol (ggc_strdup (label), block, offset);
6461 SYMBOL_REF_FLAGS (anchor) |= SYMBOL_FLAG_LOCAL | SYMBOL_FLAG_ANCHOR;
6462 SYMBOL_REF_FLAGS (anchor) |= model << SYMBOL_FLAG_TLS_SHIFT;
6464 /* Insert it at index BEGIN. */
6465 VEC_safe_insert (rtx, gc, block->anchors, begin, anchor);
6469 /* Output the objects in BLOCK. */
6472 output_object_block (struct object_block *block)
6474 struct constant_descriptor_rtx *desc;
6476 HOST_WIDE_INT offset;
6480 if (block->objects == NULL)
6483 /* Switch to the section and make sure that the first byte is
6484 suitably aligned. */
6485 switch_to_section (block->sect);
6486 assemble_align (block->alignment);
6488 /* Define the values of all anchors relative to the current section
6490 for (i = 0; VEC_iterate (rtx, block->anchors, i, symbol); i++)
6491 targetm.asm_out.output_anchor (symbol);
6493 /* Output the objects themselves. */
6495 for (i = 0; VEC_iterate (rtx, block->objects, i, symbol); i++)
6497 /* Move to the object's offset, padding with zeros if necessary. */
6498 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol) - offset);
6499 offset = SYMBOL_REF_BLOCK_OFFSET (symbol);
6500 if (CONSTANT_POOL_ADDRESS_P (symbol))
6502 desc = SYMBOL_REF_CONSTANT (symbol);
6503 output_constant_pool_1 (desc, 1);
6504 offset += GET_MODE_SIZE (desc->mode);
6506 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
6508 decl = SYMBOL_REF_DECL (symbol);
6509 assemble_constant_contents (decl, XSTR (symbol, 0),
6510 get_constant_alignment (decl));
6511 offset += get_constant_size (decl);
6515 decl = SYMBOL_REF_DECL (symbol);
6516 assemble_variable_contents (decl, XSTR (symbol, 0), false);
6517 offset += tree_low_cst (DECL_SIZE_UNIT (decl), 1);
6522 /* A htab_traverse callback used to call output_object_block for
6523 each member of object_block_htab. */
6526 output_object_block_htab (void **slot, void *data ATTRIBUTE_UNUSED)
6528 output_object_block ((struct object_block *) (*slot));
6532 /* Output the definitions of all object_blocks. */
6535 output_object_blocks (void)
6537 htab_traverse (object_block_htab, output_object_block_htab, NULL);
6540 /* This function provides a possible implementation of the
6541 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
6542 by -frecord-gcc-switches it creates a new mergeable, string section in the
6543 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
6544 contains the switches in ASCII format.
6546 FIXME: This code does not correctly handle double quote characters
6547 that appear inside strings, (it strips them rather than preserving them).
6548 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
6549 characters - instead it treats them as sub-string separators. Since
6550 we want to emit NUL strings terminators into the object file we have to use
6554 elf_record_gcc_switches (print_switch_type type, const char * name)
6556 static char buffer[1024];
6558 /* This variable is used as part of a simplistic heuristic to detect
6559 command line switches which take an argument:
6561 "If a command line option does not start with a dash then
6562 it is an argument for the previous command line option."
6564 This fails in the case of the command line option which is the name
6565 of the file to compile, but otherwise it is pretty reasonable. */
6566 static bool previous_name_held_back = FALSE;
6570 case SWITCH_TYPE_PASSED:
6573 if (previous_name_held_back)
6575 unsigned int len = strlen (buffer);
6577 snprintf (buffer + len, sizeof buffer - len, " %s", name);
6578 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
6579 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
6580 previous_name_held_back = FALSE;
6584 strncpy (buffer, name, sizeof buffer);
6585 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
6586 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
6591 if (previous_name_held_back)
6593 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
6594 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
6597 strncpy (buffer, name, sizeof buffer);
6598 previous_name_held_back = TRUE;
6602 case SWITCH_TYPE_DESCRIPTIVE:
6605 /* Distinguish between invocations where name is NULL. */
6606 static bool started = false;
6610 if (previous_name_held_back)
6612 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
6613 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
6620 sec = get_section (targetm.asm_out.record_gcc_switches_section,
6624 | (SECTION_ENTSIZE & 1),
6626 switch_to_section (sec);
6635 /* The return value is currently ignored by the caller, but must be 0.
6636 For -fverbose-asm the return value would be the number of characters
6637 emitted into the assembler file. */
6641 /* Emit text to declare externally defined symbols. It is needed to
6642 properly support non-default visibility. */
6644 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED,
6646 const char *name ATTRIBUTE_UNUSED)
6648 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
6649 set in order to avoid putting out names that are never really
6651 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
6652 && targetm.binds_local_p (decl))
6653 maybe_assemble_visibility (decl);
6656 #include "gt-varasm.h"